Control Scheme for Improved Efficiency in a H-bridge Buck-Boost Converter
01 Dec 2018-
TL;DR: A control scheme is presented to achieve better efficiency in a H-bridge buck-boost DC-DC converter by introducing maximum direct power component without affecting the steady state voltage gain.
Abstract: This paper presents a control scheme for achieving improved efficiency in a H-bridge buck-boost DC-DC converter. The H-bridge buck-boost converter with conventional control scheme operates at lower efficiency compared to buck and boost converter for the same step down/up action, due to the absence of direct power component. A control scheme is presented in this paper to achieve better efficiency by introducing maximum direct power component without affecting the steady state voltage gain. A hardware prototype of 500 W is tested with the proposed control scheme and an efficiency improvement of 4 % is observed as compared to that of the conventional control.
Citations
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TL;DR: The proposed DZFC scheme improves the efficiency during transition modes by reducing the switching loss, a generalized small-signal model valid for the buck, boost, and transition modes and a control design is proposed for improved dynamic performance.
Abstract: The H-bridge buck–boost converter shows better efficiency compared to all other buck–boost converter variants due to the ability to work in buck and boost modes. The existence of dead-zone in voltage gain during mode transition due to the maximum and minimum duty limitations results in instability and oscillations in output voltage. This dead-zone is eliminated by overlapping the buck and boost gate signals, which results in efficiency decrement due to high switching loss. Using a common compensator in all the modes in the H-bridge buck–boost converter results in poor dynamic performance. In this article, dead-zone free control (DZFC) scheme with increased efficiency and improved dynamic performance is proposed to mitigate the dead-zone during mode transition. In the proposed DZFC scheme, dead-zone elimination is independent of the values of mode boundaries, which reduce the transition mode duration. The proposed DZFC scheme improves the efficiency during transition modes by reducing the switching loss, a generalized small-signal model valid for the buck, boost, and transition modes and a control design is proposed for improved dynamic performance. The proposed DZFC scheme is verified experimentally on a hardware H-bridge buck–boost converter prototype.
7 citations
Cites background from "Control Scheme for Improved Efficie..."
...H-bridge buck–boost converter with improved efficiency and lower component stress is presented in [2], [4], [6], [8], and [13]–[16]....
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...H-bridge buck–boost converter, which operates as a buck or boost converter depending upon the gating signals given to the switches is the preferred option [2], [4], [6], [8], [13]–[16]....
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...Control schemes are evolving toward the improvement in efficiency during the transition mode by reducing the rms current in the inductor and thereby reducing the conduction loss [2], [4], [8], [13]–[16]....
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...These control schemes mitigate the dead zone by introducing a buck–boost operation, where all the four switches are controlled [2], [4], [6], [8], [13]–[16]....
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TL;DR: This paper presents the development of a multi-input multi-output bi-directional power converter (MIMO-BDPC) with a digital pulse-width modulation (DPWM) controller for solar photovoltaic (SVP) application via this intelligent digital approach.
Abstract: This paper presents the development of a multi-input multi-output bi-directional power converter (MIMO-BDPC) with a digital pulse-width modulation (DPWM) controller for solar photovoltaic (SVP) application. The converter is operated in three modes such as buck, boost, and inverter. The converter uses a minimum number of active components and the DPWM controller controls the switching frequency or pulse period which are reconfigurable for effective synchronous and autonomous operation. The autonomous mode is selected by the controller based on the availability of the power source. The combination of high performance, low cost, and high reliability in a single controller is achieved via this intelligent digital approach. The controller is based on the power and load changes in multiple PWM modes. The Intel Altera Cyclone IV FPGA control will be used for digital PWM. The FPGA is scheduled for parallel data processing with multiple resource blocks. During control, this controller can be reprogrammed dynamically again. This makes the system extremely efficient in the check aspect, reducing time and cost. The proposed MIMO-BDPC is tested with the above-mentioned modes of operation using MATLAB software and also through hardware results.
5 citations
24 Aug 2021
1 citations
19 May 2023
TL;DR: In this article , a dual input bidirectional dc-dc converter is proposed and is operated in four modes: low power, medium power, high power and regenerative braking mode.
Abstract: In Electric Vehicles (EVs), hybrid energy storage systems (HESS) are becoming popular to increase the cycle life of the battery. Ultracapacitor (UC) is one of the energy storages, which is preferred along with battery because it has higher cycle life and power density compared to the battery. Thus, frequent charging and discharging of UC are preferred. A new UC/battery HESS-based dual input bidirectional dc-dc converter is proposed and is operated in four modes: low power, medium power, high power and regenerative braking mode. Particularly, medium power mode has four states during its operation and in all states, sources are directly connected to the dc link, which leads to the higher efficiency of the system. Moreover, zero voltage switching (ZVS) is achieved in the modes, which further enhances the efficiency of the system. The control scheme and operating principle of the proposed converter have been explained in detail. All four modes of the proposed converter are validated by MATLAB-based simulation.
19 May 2023
TL;DR: In this paper , a dual input bidirectional dc-dc converter is proposed and is operated in four modes: low power, medium power, high power and regenerative braking mode.
Abstract: In Electric Vehicles (EVs), hybrid energy storage systems (HESS) are becoming popular to increase the cycle life of the battery. Ultracapacitor (UC) is one of the energy storages, which is preferred along with battery because it has higher cycle life and power density compared to the battery. Thus, frequent charging and discharging of UC are preferred. A new UC/battery HESS-based dual input bidirectional dc-dc converter is proposed and is operated in four modes: low power, medium power, high power and regenerative braking mode. Particularly, medium power mode has four states during its operation and in all states, sources are directly connected to the dc link, which leads to the higher efficiency of the system. Moreover, zero voltage switching (ZVS) is achieved in the modes, which further enhances the efficiency of the system. The control scheme and operating principle of the proposed converter have been explained in detail. All four modes of the proposed converter are validated by MATLAB-based simulation.
References
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01 Feb 1988
TL;DR: In this article, a zero-voltage switching technique that utilizes a resonant transition during a short but finite switching interval is described. But, conduction losses are increased because ripple currents are increased and synchronous rectification is required.
Abstract: A zero-voltage switching technique is described that utilizes a resonant transition during a short but finite switching interval. This zero-voltage resonant-transition (ZVRT) switching technique can be applied to conventional buck, boost, and buck-boost power converter topologies that operate with a constant switching frequency and use pulsewidth modulation for output control. Since frequency-dependent losses are greatly reduced in the power transistors, efficient operation at higher switching frequencies (>1 MHz) is allowed. However, conduction losses are increased because ripple currents are increased and synchronous rectification is required. Experimental results are presented for an interleaved flyback converter that operates with ZVRT switching at 1 MHz. >
299 citations
"Control Scheme for Improved Efficie..." refers methods in this paper
...Advantages of this method would be significant only at high switching frequency where conduction loss is lesser than switching loss [10]....
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17 Jun 2001
TL;DR: Two-switch buck-boost converters are evaluated and compared in terms of component stresses in universal-input power-factor-corrector applications, and one new two-switch converter is identified that hasLow inductor conduction losses, low inductor volt-seconds, and about the same switch Conduction losses and voltage stresses as the boost converter.
Abstract: Single-switch step-up/step-down converters, such as the buck-boost, SEPIC and Cuk, have relatively high voltage and current stresses on components compared to the buck or the boost converter. A buck-boost converter with two independently controlled switches can work as a boost or as a buck converter depending on input-output conditions, and thus achieves lower stresses on components. Using the converter synthesis method from D. Zhou (1995), families of two-switch buck-boost converters are generated, including several new converter topologies. The two-switch buck-boost converters are evaluated and compared in terms of component stresses in universal-input power-factor-corrector applications. Among them, one new two-switch converter is identified that has low inductor conduction losses (50% of the boost converter), low inductor volt-seconds (72% of the boost converter), and about the same switch conduction losses and voltage stresses as the boost converter.
246 citations
"Control Scheme for Improved Efficie..." refers background in this paper
...INTRODUCTION A positive non isolated buck-boost DC-DC converter is popularly employed in battery, Telecom, space,PFC and fuel cell applications where the input and the output voltage ranges overlap [1], [2], [3], [4], [5] ....
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TL;DR: In this paper, a highly efficient and novel control strategy for improving the transients in the output voltage of a DC-DC positive buck-boost converter, required for low-power portable electronic applications, is presented.
Abstract: A highly efficient and novel control strategy for improving the transients in the output voltage of a DC-DC positive buck-boost converter, required for low-power portable electronic applications, is presented in this paper. The proposed control technique can regulate the output voltage for variable input voltage, which is higher, lower, or equal to the output voltage. There are several existing solutions to these problems, and selecting the best approach involves a tradeoff among cost, efficiency, and output noise or ripple. In the proposed method, instead of instantaneous transition from buck to boost mode, intermediate combination modes consisting of several buck modes followed by several boost modes are utilized to distribute the voltage transients. This is unique of its kind from the point of view of improving the efficiency and ripple content in the output voltage. Theoretical considerations are presented. Simulation and experimental results are shown to prove the proposed theory.
115 citations
"Control Scheme for Improved Efficie..." refers background or methods in this paper
...INTRODUCTION A positive non isolated buck-boost DC-DC converter is popularly employed in battery, Telecom, space,PFC and fuel cell applications where the input and the output voltage ranges overlap [1], [2], [3], [4], [5] ....
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...Cascaded buck-boost converter has high component count and less efficiency due to the presence of two stages [1]....
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...Control schemes and topologies are reported in literature for increased efficiency during this transition period in H-bridge buck-boost converter [1]- [3]....
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...Better efficiency in H-bridge buck-boost converter is achieved through minimum indirect power component by operating in buck/boost mode for step down/up of input voltages respectively [1]....
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...This transition from one mode to another causes output voltage transients [1], [8] ....
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16 May 2008
TL;DR: A controlling scheme for the four switch buck-boost converter is proposed to achieve high efficiency within the line range and the highest efficiency around the nominal input.
Abstract: Converters for telecom DC/DC power supply applications often require an output voltage somewhere within a wide range of input voltages. While the design of traditional converters will come with a heavy penalty in terms of component stresses and losses, and with the restrictions on the output voltage. Besides that, the high efficiency around the nominal input is another restriction for traditional converters. A controlling scheme for the four switch buck-boost converter is proposed to achieve high efficiency within the line range and the highest efficiency around the nominal input. A 48 V(36-75 V) input 12 V@25 A output two-stage prototype composed of the proposed converter and a full bridge converter is built in the lab. The experimental results verified the analysis.
49 citations
"Control Scheme for Improved Efficie..." refers background in this paper
...Efficiency improvement by operating H-bridge buck-boost converter as a filter during the transition period is presented in [2]....
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...INTRODUCTION A positive non isolated buck-boost DC-DC converter is popularly employed in battery, Telecom, space,PFC and fuel cell applications where the input and the output voltage ranges overlap [1], [2], [3], [4], [5] ....
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...H-bridge buck boost converter with improved efficiency and lower component stresses is proposed in [1]- [2]....
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...Using additional buck-boost mode between buck mode and boost mode is the conventional way of reducing the voltage transients [2]....
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01 Nov 2008
TL;DR: The implementation with synchronous rectifiers provides the highest efficiency in the whole range of the fuel cell power, and its efficiency characteristic is more suitable for fuel cell applications than the implementation with diodes.
Abstract: Fuel cell DC/DC converters often have to be able to both step-up and step-down the input voltage, and provide a high efficiency in the whole range of output power Conventional negative output buck-boost and non-inverting buck-boost converters provide both step-up and step-down characteristics In this paper the non-inverting buck-boost with either diodes or synchronous rectifiers is investigated for fuel cell applications Most of previous research does not consider the parasitic in the evaluation of the converters In this study, detailed analytical expressions of the efficiencies for the system composed of fuel cell system and interfacing converter, considering the parasitics, are presented It is concluded that the implementation with synchronous rectifiers provides the highest efficiency in the whole range of the fuel cell power, and its efficiency characteristic is more suitable for fuel cell applications than the implementation with diodes
49 citations
"Control Scheme for Improved Efficie..." refers background in this paper
...INTRODUCTION A positive non isolated buck-boost DC-DC converter is popularly employed in battery, Telecom, space,PFC and fuel cell applications where the input and the output voltage ranges overlap [1], [2], [3], [4], [5] ....
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