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10 10 Updates found with amorphous high frequency transformer coupling multiple converters

Updates found with 'amorphous high frequency transformer coupling multiple converters'

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 ELECTRONICS PROJECT TITLES Design and Implementation of an Amorphous High Frequency Transformer Coupling Multiple Converters in a Smart Micro GridAbstract—Recent improvements in magnetic material characteristics and switching devices have generated a possibility to replace the electrical buses with high frequency magnetic links in micro-grids. Multi-windingtransformers (MWTs) as magnetic links can effectively reduce the number of conversion stages of renewable energy system by adjusting turn ratio of windings according to the source voltage level. Other advantages are galvanic isolation, bidirectional power flow capabilityand simultaneous power transfer between multiple ports. Despite the following benefits, design and characterization of MWTs are relatively complex due to their structural complexity and cross coupling effects. This paper presents all stages of numerical design, prototyping andcharacterization of a MWT for micro-grid application. To design the transformer for certain value of parameters, reluctance network method is employed. Due to the iterative nature of transformer design it presented less computation time and reasonable accuracy. A rototype of designed transformer is implemented using amorphous magnetic materials. A set of experimental tests are conducted to measure the magnetic characteristics of the core and series coupling and open circuit tests are applied to measure the transformer parameters. A comparison between the simulation and experimental test resultsunder different loads within the medium frequency range validated both design and modeling procedures. CONTACT:GANESAN.P+91  9865862045+91  8903410319
IEEE 2017 - 18 POWER ELECTRONICS PROJECT TITLES Design and Implementation of an Amorphous High Frequency Transformer Coupling Multiple Converters in a Smart Micro GridAbstract—Recent improvements in magnetic material characteristics and switching devices have generated a possibility to replace the electrical buses with high frequency magnetic links in micro-grids. Multi-windingtransformers (MWTs) as magnetic links can effectively reduce the number of conversion stages of renewable energy system by adjusting turn ratio of windings according to the source voltage level. Other advantages are galvanic isolation, bidirectional power flow capabilityand simultaneous power transfer between multiple ports. Despite the following benefits, design and characterization of MWTs are relatively complex due to their structural complexity and cross coupling effects. This paper presents all stages of numerical design, prototyping andcharacterization of a MWT for micro-grid application. To design the transformer for certain value of parameters, reluctance network method is employed. Due to the iterative nature of transformer design it presented less computation time and reasonable accuracy. A rototype of designed transformer is implemented using amorphous magnetic materials. A set of experimental tests are conducted to measure the magnetic characteristics of the core and series coupling and open circuit tests are applied to measure the transformer parameters. A comparison between the simulation and experimental test resultsunder different loads within the medium frequency range validated both design and modeling procedures. CONTACT:GANESAN.P+91 9865862045+91 8903410319
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 ELECTRONICS  ABSTRACTDESIGN AND IMPLEMENTATION OF AN AMORPHOUS HIGH-FREQUENCY TRANSFORMER COUPLING MULTIPLE CONVERTERS IN A SMART MICRO GRID Introduction:-        Smart micro grid technologies have imposed increasing demands for more reliable and flexible converters and control techniques. In contrast to the traditional electrical ac and dc buses, the high-frequency magnetic Links can reduce effectively the number of conversion stages in micro grids with the help of modern soft magnetic materials with superior magnetic characteristics and fast- and low-power loss switching devices.         Multiwinding transformers (MWTS) can provide a common magnetic bus for integrating renewable energies in the form of magnetic flux. Their application in the multiactive bridge phase-shift converter makes it possible to simply integrate the sources of different voltage levels using different turn ratios. Other advantages are galvanic isolation, bidirectional power flow capability, faster control, and simultaneous power transfer among the ports. Design of MWTS for certain value of inductances is relatively complex due to their complex structure and cross-coupling effects.Proposed system:-              Multi Winding Transformers have been used as the common magnetic links in multiactive bridge phase-shift converters to integrate the renewable energies effectively. The converter designed in this research includes four ports connected to the load, fuel cell, battery, and photovoltaic (PV). The Hbridge units produce high-frequency ac square wave from dc buses linked to the dc sources. The power flow between the ports one, two, and three is controlled by using the phase-shift technique. To apply the technique, port one is selected as the reference and ports two and three are shifted for a leading or lagging phase angle to send or receive power to port one. A duty cycle control is applied to port three for the maximum power point tracking of PV panel.         The RNM is very fast but less accurate . Magnetic field analysis using an FEM can take into account the nonlinearity of magnetic materials, geometry, and actual winding distribution while an RNM is based on linear assumptions.Advantages:-•	Presented less computation time.•	Reasonable accuracy.Applications:•	Grid applications.
IEEE 2017-2018 POWER ELECTRONICS ABSTRACTDESIGN AND IMPLEMENTATION OF AN AMORPHOUS HIGH-FREQUENCY TRANSFORMER COUPLING MULTIPLE CONVERTERS IN A SMART MICRO GRID Introduction:- Smart micro grid technologies have imposed increasing demands for more reliable and flexible converters and control techniques. In contrast to the traditional electrical ac and dc buses, the high-frequency magnetic Links can reduce effectively the number of conversion stages in micro grids with the help of modern soft magnetic materials with superior magnetic characteristics and fast- and low-power loss switching devices. Multiwinding transformers (MWTS) can provide a common magnetic bus for integrating renewable energies in the form of magnetic flux. Their application in the multiactive bridge phase-shift converter makes it possible to simply integrate the sources of different voltage levels using different turn ratios. Other advantages are galvanic isolation, bidirectional power flow capability, faster control, and simultaneous power transfer among the ports. Design of MWTS for certain value of inductances is relatively complex due to their complex structure and cross-coupling effects.Proposed system:- Multi Winding Transformers have been used as the common magnetic links in multiactive bridge phase-shift converters to integrate the renewable energies effectively. The converter designed in this research includes four ports connected to the load, fuel cell, battery, and photovoltaic (PV). The Hbridge units produce high-frequency ac square wave from dc buses linked to the dc sources. The power flow between the ports one, two, and three is controlled by using the phase-shift technique. To apply the technique, port one is selected as the reference and ports two and three are shifted for a leading or lagging phase angle to send or receive power to port one. A duty cycle control is applied to port three for the maximum power point tracking of PV panel. The RNM is very fast but less accurate . Magnetic field analysis using an FEM can take into account the nonlinearity of magnetic materials, geometry, and actual winding distribution while an RNM is based on linear assumptions.Advantages:-• Presented less computation time.• Reasonable accuracy.Applications:• Grid applications.
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TRONICS  ABSTRACT:GRID-CONNECTED PV-WIND-BATTERY BASED MULTI-INPUT TRANSFORMER COUPLED BIDIRECTIONAL DC-DC CONVERTER FOR HOUSEHOLD APPLICATIONS ABSTRACT:                   Rapid depletion of fossil fuel reserves, ever increasing energy demand and concerns over climate change motivate power generation from renewable energy sources. Solar photovoltaic (PV) and wind have emerged as popular energy sources due to their eco-friendly nature and cost effectiveness. However, these sources are intermittent in nature. Hence, it is a challenge to supply stable and continuous power using these sources. This can be addressed by efficiently integrating with energy storage elements.	The interesting complementary behaviour of solar insolation and wind velocity pattern coupled with the above mentioned advantages, has led to the research on their integration resulting in the hybrid PV-wind systems. For achieving the integration of multiple renewable sources, the traditional approach involves using dedicated single-input converters one for each source, which are connected to a common dc-bus. However, these converters are not effectively utilized, due to the intermittent nature of the renewable sources. In addition, there are multiple power conversion stages which reduce the efficiency of the system.EXISTING SYSTEM:	The magnetic coupling approach is used to derive a multiport converter, where the multi-winding transformer is employed to combine each terminal. In fully isolated multiport dc-dc converters, the half-bridge, full-bridge, and hybrid structure based multi-port dc-dc converters with a magnetic coupling solution can be derived for different applications, power, voltage, and current levels. The snubber capacitors and transformer leakage inductance are employed to achieve soft-switching by adjusting the phase-shift angle. However, the circuit layout is complex and the only sharing component is the multi-winding transformer. So, the disadvantage of time sharing control to couple input port is overcome. Here, among multiple inputs, each input has its own power components which increase the component count. Also, the design of multi-winding transformer is an involved process. PROPOSED SYSTEM:	The grid-connected hybrid PV-wind-battery based system for household applications, which can work either in stand-alone or grid connected mode. This system is suitable for household applications, where a low-cost, simple and compact topology capable of autonomous operation is desirable. The core of the proposed system is the multi-input transformer coupled bidirectional dc-dc converter that interconnects various power sources and the storage element.	The proposed converter consists of a transformer coupled boost dual-half-bridge bidirectional converter fused with bidirectional buck-boost converter and a single-phase full-bridge inverter. The proposed converter has reduced number of power conversion stages with less component count and high efficiency compared to the existing grid-connected schemes. The topology is simple and needs only six power switches. The boost dual-half-bridge converter has two dc-links on both sides of the high frequency transformer. Controlling the voltage of one of the dc-links ensures controlling the voltage of the other. This makes the control strategy simple. Moreover, additional converters can be integrated with any one of the two dc-links. A bidirectional buck-boost dc-dc converter is integrated with the primary side dc-link and single-phase full-bridge bidirectional converter is connected to the dc-link of the secondary side. ADVANTAGES:•	Less component count and reduced losses.•	Reduced number of power conversion stages.•	Inject surplus power into the grid and charge the battery from grid as and when required.APPLICATIONS:•	Household Application.•	Grid-connected hybrid PV-wind-battery system.
IEEE 2016 POWER ELECTRONICS ABSTRACT:GRID-CONNECTED PV-WIND-BATTERY BASED MULTI-INPUT TRANSFORMER COUPLED BIDIRECTIONAL DC-DC CONVERTER FOR HOUSEHOLD APPLICATIONS ABSTRACT: Rapid depletion of fossil fuel reserves, ever increasing energy demand and concerns over climate change motivate power generation from renewable energy sources. Solar photovoltaic (PV) and wind have emerged as popular energy sources due to their eco-friendly nature and cost effectiveness. However, these sources are intermittent in nature. Hence, it is a challenge to supply stable and continuous power using these sources. This can be addressed by efficiently integrating with energy storage elements. The interesting complementary behaviour of solar insolation and wind velocity pattern coupled with the above mentioned advantages, has led to the research on their integration resulting in the hybrid PV-wind systems. For achieving the integration of multiple renewable sources, the traditional approach involves using dedicated single-input converters one for each source, which are connected to a common dc-bus. However, these converters are not effectively utilized, due to the intermittent nature of the renewable sources. In addition, there are multiple power conversion stages which reduce the efficiency of the system.EXISTING SYSTEM: The magnetic coupling approach is used to derive a multiport converter, where the multi-winding transformer is employed to combine each terminal. In fully isolated multiport dc-dc converters, the half-bridge, full-bridge, and hybrid structure based multi-port dc-dc converters with a magnetic coupling solution can be derived for different applications, power, voltage, and current levels. The snubber capacitors and transformer leakage inductance are employed to achieve soft-switching by adjusting the phase-shift angle. However, the circuit layout is complex and the only sharing component is the multi-winding transformer. So, the disadvantage of time sharing control to couple input port is overcome. Here, among multiple inputs, each input has its own power components which increase the component count. Also, the design of multi-winding transformer is an involved process. PROPOSED SYSTEM: The grid-connected hybrid PV-wind-battery based system for household applications, which can work either in stand-alone or grid connected mode. This system is suitable for household applications, where a low-cost, simple and compact topology capable of autonomous operation is desirable. The core of the proposed system is the multi-input transformer coupled bidirectional dc-dc converter that interconnects various power sources and the storage element. The proposed converter consists of a transformer coupled boost dual-half-bridge bidirectional converter fused with bidirectional buck-boost converter and a single-phase full-bridge inverter. The proposed converter has reduced number of power conversion stages with less component count and high efficiency compared to the existing grid-connected schemes. The topology is simple and needs only six power switches. The boost dual-half-bridge converter has two dc-links on both sides of the high frequency transformer. Controlling the voltage of one of the dc-links ensures controlling the voltage of the other. This makes the control strategy simple. Moreover, additional converters can be integrated with any one of the two dc-links. A bidirectional buck-boost dc-dc converter is integrated with the primary side dc-link and single-phase full-bridge bidirectional converter is connected to the dc-link of the secondary side. ADVANTAGES:• Less component count and reduced losses.• Reduced number of power conversion stages.• Inject surplus power into the grid and charge the battery from grid as and when required.APPLICATIONS:• Household Application.• Grid-connected hybrid PV-wind-battery system.
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STRACT 2016-2017 A DC- VOLTAGE VARIABLE CAPACITOR FOR STABILIZING THE ZVS FREQUENCY OF A RESONANT CONVERTER FOR WIRELESS POWER TRANSFER ABSTRACT: Varators are often used in PLL (phase locked loop) circuits for dynamic frequency control. However, the voltage and current ratings of varactors are too low to be used in most power electronic circuits. This paper proposes a transistor controlled variable capacitor (TCVC), which functions similar to varactors in that its equivalent capacitance can be controlled by a DC voltage. However, the TCVCcan handle high voltages and currents so that it can be used in DC-AC power converters of Wireless Power Transfer (WPT) systems such as an autonomous push pull resonant converter to adjust its ZVS (zero voltage switching) frequency so that the operating frequency of the system can be stabilized to simplify the circuit and EMI filter design particularly for WPT systems with multiple power pickups, while maintaining soft-switching operation of the converter against magnetic coupling and load variations. The relationship between the equivalent capacitance of the TCVCand the DC control voltage is developed by theoretical analysis and verified by experimental results. A prototype circuit is built with a PLL controller to demonstrate that the soft-switching condition of the converter is maintained when the operating frequency is locked in at 1.65MHz under load and magnetic coupling variations.
POWER ELECTRONICS ABSTRACT 2016-2017 A DC- VOLTAGE VARIABLE CAPACITOR FOR STABILIZING THE ZVS FREQUENCY OF A RESONANT CONVERTER FOR WIRELESS POWER TRANSFER ABSTRACT: Varators are often used in PLL (phase locked loop) circuits for dynamic frequency control. However, the voltage and current ratings of varactors are too low to be used in most power electronic circuits. This paper proposes a transistor controlled variable capacitor (TCVC), which functions similar to varactors in that its equivalent capacitance can be controlled by a DC voltage. However, the TCVCcan handle high voltages and currents so that it can be used in DC-AC power converters of Wireless Power Transfer (WPT) systems such as an autonomous push pull resonant converter to adjust its ZVS (zero voltage switching) frequency so that the operating frequency of the system can be stabilized to simplify the circuit and EMI filter design particularly for WPT systems with multiple power pickups, while maintaining soft-switching operation of the converter against magnetic coupling and load variations. The relationship between the equivalent capacitance of the TCVCand the DC control voltage is developed by theoretical analysis and verified by experimental results. A prototype circuit is built with a PLL controller to demonstrate that the soft-switching condition of the converter is maintained when the operating frequency is locked in at 1.65MHz under load and magnetic coupling variations.
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TRONICS ABSTRACTLCL FILTER DESIGN FOR THREE-PHASE TWO-LEVEL POWER FACTOR CORRECTION USING LINE IMPEDANCE STABILIZATION NETWORK ABSTRACT:                     These days, three-phase grid-connected PWM voltage source converters (VSCs) like two-level or multilevel converters are widely used in many applications. Trying to improve the power quality and attenuating the current harmonics generated by these converters leads to different approaches such as filter design and harmonic elimination/mitigation methods. To attenuate the harmonic contents at high frequencies one possible solution is relying on the inductor of three-phase boost VSC as a filter. Nevertheless, this solution leads to a bulky inductor with high power inductor losses. Besides, the large inductance value degrades the performance of the controller. Employing high order filters such as LCL, LLCL filters to fulfil the grid regulations are highly attractive solution and have been studied in many researchesEXISTING SYSTEM:                  The DC side of the rectifier consists of the DC capacitor and is connected to a load. Here, two LCL-filter configurations with different resonance frequencies are used. Choosing a higher filter capacitor yields to higher damping of the switching harmonics, but reduces the resonance frequency of the filter as it can be seen in the Bode diagram in Fig. 2.For the purpose of feedback the DC link voltage as well as the converter and line currents are measured. The line voltage is measured for synchronizing the control with the grid frequency. Here the space vector notation is used. The three-phase values are transformed into stationary reference frame and further, using the line voltage vector, into rotating dq coordinates in order to perform the voltage-oriented-control. From control point of view it is advantageous to control DC values since PI controllers can achieve reference tracking without steady state errors. As disadvantage the coordinate transformation leads to current dynamics coupling. PROPOSED SYSTEM:	            A method for designing an LCL filter for two-level PFCs using LISN. Using the equivalent circuit of the converter, the effect of LISN on measurement is studied. Filter parameters are, then, calculated by analyzing the equivalent circuit. In this paper, a passive damping method also is employed for improving the dynamic performance of the converter. Finally, a 5 kW three-phase PFC setup is used to verify the performance of the designed filter. The single-phase equivalent circuit not only simplifies designing the filter, but also helps to investigate the effect of LISN on circuit. To do that, the noise source must be defined. For an SPWM grid-connected VSC, using double Fourier analysis, the amplitude of ac link voltage at multiples of switching frequency (carrier frequency).ADVANTAGES:•	Improved dynamic performance.•	Low impedance network for the high frequency harmonics. APPLICATIONS:•	High and low power applications.•	Silicon-carbides (SiCs).
IEEE 2016 POWER ELECTRONICS ABSTRACTLCL FILTER DESIGN FOR THREE-PHASE TWO-LEVEL POWER FACTOR CORRECTION USING LINE IMPEDANCE STABILIZATION NETWORK ABSTRACT: These days, three-phase grid-connected PWM voltage source converters (VSCs) like two-level or multilevel converters are widely used in many applications. Trying to improve the power quality and attenuating the current harmonics generated by these converters leads to different approaches such as filter design and harmonic elimination/mitigation methods. To attenuate the harmonic contents at high frequencies one possible solution is relying on the inductor of three-phase boost VSC as a filter. Nevertheless, this solution leads to a bulky inductor with high power inductor losses. Besides, the large inductance value degrades the performance of the controller. Employing high order filters such as LCL, LLCL filters to fulfil the grid regulations are highly attractive solution and have been studied in many researchesEXISTING SYSTEM: The DC side of the rectifier consists of the DC capacitor and is connected to a load. Here, two LCL-filter configurations with different resonance frequencies are used. Choosing a higher filter capacitor yields to higher damping of the switching harmonics, but reduces the resonance frequency of the filter as it can be seen in the Bode diagram in Fig. 2.For the purpose of feedback the DC link voltage as well as the converter and line currents are measured. The line voltage is measured for synchronizing the control with the grid frequency. Here the space vector notation is used. The three-phase values are transformed into stationary reference frame and further, using the line voltage vector, into rotating dq coordinates in order to perform the voltage-oriented-control. From control point of view it is advantageous to control DC values since PI controllers can achieve reference tracking without steady state errors. As disadvantage the coordinate transformation leads to current dynamics coupling. PROPOSED SYSTEM: A method for designing an LCL filter for two-level PFCs using LISN. Using the equivalent circuit of the converter, the effect of LISN on measurement is studied. Filter parameters are, then, calculated by analyzing the equivalent circuit. In this paper, a passive damping method also is employed for improving the dynamic performance of the converter. Finally, a 5 kW three-phase PFC setup is used to verify the performance of the designed filter. The single-phase equivalent circuit not only simplifies designing the filter, but also helps to investigate the effect of LISN on circuit. To do that, the noise source must be defined. For an SPWM grid-connected VSC, using double Fourier analysis, the amplitude of ac link voltage at multiples of switching frequency (carrier frequency).ADVANTAGES:• Improved dynamic performance.• Low impedance network for the high frequency harmonics. APPLICATIONS:• High and low power applications.• Silicon-carbides (SiCs).
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TRONICS  ABSTRACTHIGH-EFFICIENCY COUPLED-INDUCTOR-BASED STEP-DOWN CONVERTE ABSTRACT:                   Step-down converters with transformer-based structures are the most popular topologies, and soft-switching techniques are usually applied to reduce the corresponding switching losses. These frameworks with transformers have higher conduction losses because the number of power switches is usually over three. Nowadays, a family of switching capacitor regulators is proposed. Although only two power switches are required, the values of the resonant capacitor and inductor should be strictly designed for ensuring all switches to be operated with the property of soft switching, and its framework is only suitable for one output terminal. A zero-voltage-switching (ZVS) synchronous buck converter with a coupled inductor was introduced. Unfortunately, this coupled inductor must have good matching characteristic to achieve the property of soft switching, and its voltage ratio is low. EXISTING SYSTEM:	The output voltage range of the auxiliary circuit can be appropriately adjusted by the design of an auxiliary inductor. A high efficiency SIMO boost converter with the properties of voltage clamping and soft switching was developed. The major difference between this study is the basic power conversion structure; i.e., the proposed circuit in this study is the buck-type converter framework, and the one is the boost-type converter circuit. The design of a high-efficiency bidirectional SIMO (BSIMO) power converter, three power switches (a low-voltage switch, a step-down switch, and a high-voltage switch), three inductors (a coupled inductor, an auxiliary inductor, and a step-down inductor), five capacitors (a clamped capacitor, a middle-voltage capacitor, and three filter capacitors), and four diodes were required.PROPOSED SYSTEM:	A high-efficiency SIMO step-down converter with a coupled inductor is designed and implemented. The proposed converter uses two power switches to achieve the objectives of high-efficiency power conversion, high step-down ratio, and multiple output terminals with different voltage levels. In the proposed SIMO step-down converter, the techniques of soft switching is adopted to reduce the switching losses. ADVANTAGES:•	Adopts two power switches with the property of ZVS to achieve the objective of high-efficiency SIMO step-down power conversion.•	The voltage ratio can be substantially increased by using a coupled inductor.•	The stray energy can be recycled by a middle-voltage capacitor to ensure the property of voltage clamping.•	An auxiliary inductor is designed for providing the charge power to the auxiliary battery module, and the charging voltage range can be appropriately regulated by the design of the auxiliary inductor.•	The copper loss in the magnetic core can be greatly reduced as a full copper film with lower turns.
IEEE 2016 POWER ELECTRONICS ABSTRACTHIGH-EFFICIENCY COUPLED-INDUCTOR-BASED STEP-DOWN CONVERTE ABSTRACT: Step-down converters with transformer-based structures are the most popular topologies, and soft-switching techniques are usually applied to reduce the corresponding switching losses. These frameworks with transformers have higher conduction losses because the number of power switches is usually over three. Nowadays, a family of switching capacitor regulators is proposed. Although only two power switches are required, the values of the resonant capacitor and inductor should be strictly designed for ensuring all switches to be operated with the property of soft switching, and its framework is only suitable for one output terminal. A zero-voltage-switching (ZVS) synchronous buck converter with a coupled inductor was introduced. Unfortunately, this coupled inductor must have good matching characteristic to achieve the property of soft switching, and its voltage ratio is low. EXISTING SYSTEM: The output voltage range of the auxiliary circuit can be appropriately adjusted by the design of an auxiliary inductor. A high efficiency SIMO boost converter with the properties of voltage clamping and soft switching was developed. The major difference between this study is the basic power conversion structure; i.e., the proposed circuit in this study is the buck-type converter framework, and the one is the boost-type converter circuit. The design of a high-efficiency bidirectional SIMO (BSIMO) power converter, three power switches (a low-voltage switch, a step-down switch, and a high-voltage switch), three inductors (a coupled inductor, an auxiliary inductor, and a step-down inductor), five capacitors (a clamped capacitor, a middle-voltage capacitor, and three filter capacitors), and four diodes were required.PROPOSED SYSTEM: A high-efficiency SIMO step-down converter with a coupled inductor is designed and implemented. The proposed converter uses two power switches to achieve the objectives of high-efficiency power conversion, high step-down ratio, and multiple output terminals with different voltage levels. In the proposed SIMO step-down converter, the techniques of soft switching is adopted to reduce the switching losses. ADVANTAGES:• Adopts two power switches with the property of ZVS to achieve the objective of high-efficiency SIMO step-down power conversion.• The voltage ratio can be substantially increased by using a coupled inductor.• The stray energy can be recycled by a middle-voltage capacitor to ensure the property of voltage clamping.• An auxiliary inductor is designed for providing the charge power to the auxiliary battery module, and the charging voltage range can be appropriately regulated by the design of the auxiliary inductor.• The copper loss in the magnetic core can be greatly reduced as a full copper film with lower turns.
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TRONICS  ABSTRACT HIGH-EFFICIENCY COUPLED-INDUCTOR-BASED STEP-DOWN CONVERTER ABSTRACT:                    Step-down converters with transformer-based structures are the most popular topologies, and soft-switching techniques are usually applied to reduce the corresponding switching losses. These frameworks with transformers have higher conduction losses because the number of power switches is usually over three. Nowadays, a family of switching capacitor regulators is proposed. Although only two power switches are required, the values of the resonant capacitor and inductor should be strictly designed for ensuring all switches to be operated with the property of soft switching, and its framework is only suitable for one output terminal. A zero-voltage-switching (ZVS) synchronous buck converter with a coupled inductor was introduced. Unfortunately, this coupled inductor must have good matching characteristic to achieve the property of soft switching, and its voltage ratio is low.:EXISTING SYSTEM:	     The output voltage range of the auxiliary circuit can be appropriately adjusted by the design of an auxiliary inductor. A high efficiency SIMO boost converter with the properties of voltage clamping and soft switching was developed. The major difference between this study is the basic power conversion structure; i.e., the proposed circuit in this study is the buck-type converter framework, and the one is the boost-type converter circuit. The design of a high-efficiency bidirectional SIMO (BSIMO) power converter, three power switches (a low-voltage switch, a step-down switch, and a high-voltage switch), three inductors (a coupled inductor, an auxiliary inductor, and a step-down inductor), five capacitors (a clamped capacitor, a middle-voltage capacitor, and three filter capacitors), and four diodes were required. PROPOSED SYSTEM:	             A high-efficiency SIMO step-down converter with a coupled inductor is designed and implemented. The proposed converter uses two power switches to achieve the objectives of high-efficiency power conversion, high step-down ratio, and multiple output terminals with different voltage levels. In the proposed SIMO step-down converter, the techniques of soft switching is adopted to reduce the switching losses.  ADVANTAGES:•	Adopts two power switches with the property of ZVS to achieve the objective of high-efficiency SIMO step-down power conversion.•	The voltage ratio can be substantially increased by using a coupled inductor.•	The stray energy can be recycled by a middle-voltage capacitor to ensure the property of voltage clamping.•	An auxiliary inductor is designed for providing the charge power to the auxiliary battery module, and the charging voltage range can be appropriately regulated by the design of the auxiliary inductor.•	The copper loss in the magnetic core can be greatly reduced as a full copper film with lower turns.
IEEE 2016 POWER ELECTRONICS ABSTRACT HIGH-EFFICIENCY COUPLED-INDUCTOR-BASED STEP-DOWN CONVERTER ABSTRACT: Step-down converters with transformer-based structures are the most popular topologies, and soft-switching techniques are usually applied to reduce the corresponding switching losses. These frameworks with transformers have higher conduction losses because the number of power switches is usually over three. Nowadays, a family of switching capacitor regulators is proposed. Although only two power switches are required, the values of the resonant capacitor and inductor should be strictly designed for ensuring all switches to be operated with the property of soft switching, and its framework is only suitable for one output terminal. A zero-voltage-switching (ZVS) synchronous buck converter with a coupled inductor was introduced. Unfortunately, this coupled inductor must have good matching characteristic to achieve the property of soft switching, and its voltage ratio is low.:EXISTING SYSTEM: The output voltage range of the auxiliary circuit can be appropriately adjusted by the design of an auxiliary inductor. A high efficiency SIMO boost converter with the properties of voltage clamping and soft switching was developed. The major difference between this study is the basic power conversion structure; i.e., the proposed circuit in this study is the buck-type converter framework, and the one is the boost-type converter circuit. The design of a high-efficiency bidirectional SIMO (BSIMO) power converter, three power switches (a low-voltage switch, a step-down switch, and a high-voltage switch), three inductors (a coupled inductor, an auxiliary inductor, and a step-down inductor), five capacitors (a clamped capacitor, a middle-voltage capacitor, and three filter capacitors), and four diodes were required. PROPOSED SYSTEM: A high-efficiency SIMO step-down converter with a coupled inductor is designed and implemented. The proposed converter uses two power switches to achieve the objectives of high-efficiency power conversion, high step-down ratio, and multiple output terminals with different voltage levels. In the proposed SIMO step-down converter, the techniques of soft switching is adopted to reduce the switching losses. ADVANTAGES:• Adopts two power switches with the property of ZVS to achieve the objective of high-efficiency SIMO step-down power conversion.• The voltage ratio can be substantially increased by using a coupled inductor.• The stray energy can be recycled by a middle-voltage capacitor to ensure the property of voltage clamping.• An auxiliary inductor is designed for providing the charge power to the auxiliary battery module, and the charging voltage range can be appropriately regulated by the design of the auxiliary inductor.• The copper loss in the magnetic core can be greatly reduced as a full copper film with lower turns.
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