Full-half bridge resonant converter and voltage balance control method thereof

A resonant converter and voltage balancing technology, applied in control/regulation systems, converting DC power input to DC power output, instruments, etc., can solve problems such as weakening DAB power transmission capabilities, reduce the number of switch tubes, improve efficiency, The effect of low switching loss

Pending Publication Date: 2022-05-10
CHANGSHU INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During this period, no real power transfer takes place in the converter, which impairs the power transfer capability of the DAB

Method used

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  • Full-half bridge resonant converter and voltage balance control method thereof
  • Full-half bridge resonant converter and voltage balance control method thereof
  • Full-half bridge resonant converter and voltage balance control method thereof

Examples

Experimental program
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Embodiment 1

[0048] Schematic diagram of full half bridge resonant converter figure 1 shown, where V in and V out are the input and output voltages, respectively, i L and i o are the input and output currents, respectively, C p is the resonant capacitor, C o1 、C o2 is the equalizing capacitor, L s is the sum of external inductance and transformer leakage inductance, S 1 ~S 4 is the switching element on the primary side, S 5 ~S 6 is the switching element on the secondary side, and each of these 6 switching elements is composed of a body diode (d S1 ~ d S6 ) and parasitic capacitance (C S1 ~C S6 ) composition, n is the transformer ratio.

[0049] First, the pulse width of each switch is adjusted to obtain the gating signal scheme for the high pulse width controller, which generates the midpoint AC voltage V ab waveform diagram. like figure 2 shown, switch S 1 and S 2 The duty cycle is 50%. Switch S 4 The pulse width is reduced to δ, S 3 The pulse width increases to 2π-...

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PUM

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Abstract

The invention discloses a full-and-half-bridge resonant converter and a voltage balance control method thereof, a primary side of the full-and-half-bridge resonant converter is a full bridge and is provided with four switching tubes and a resonant inductor and a capacitor, a secondary side of the full-and-half-bridge resonant converter is a half bridge and is provided with two switching tubes, the full-and-half-bridge resonant converter is provided with six switching tubes, and compared with an existing double-bridge resonant converter, the full-and-half-bridge resonant converter has the advantage that the number of elements is reduced. A fundamental wave approximation method is adopted to analyze a power model and a soft switching condition, and a voltage balance control strategy is provided, so that the converter can realize voltage balance of a primary side and a secondary side in a wide voltage range, soft switching of all switching tubes is ensured, and the efficiency of the converter is improved.

Description

technical field [0001] The invention relates to the control technology of an isolated high-frequency resonant converter, in particular to a topology of a full half-bridge resonant converter and a voltage balance control method thereof. Background technique [0002] In the composition of new energy electric vehicles, the on-board charger OBC (On-Board-Charger) is one of the core devices, which consists of power factor correction PFC and isolated bidirectional DC-DC. The isolated bidirectional DC-DC converter has attracted more and more attention due to its advantages of high power density, electrical isolation, and bidirectional energy transmission. However, when the voltage gain deviates from 1, problems such as loss of soft switching, increased circulating current, and saturation of the transformer will occur, resulting in a decrease in converter efficiency. [0003] The resonant dual active bridge converter has a wide soft-switching range, and some phase / shift control sch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M1/32
CPCH02M3/33576H02M1/32Y02B70/10
Inventor 胡松汪锐钟黎萍杨浩东康乐杨晴晴
Owner CHANGSHU INSTITUTE OF TECHNOLOGY
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