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Half-bridge llc resonant converter interleaved parallel circuit and its current sharing control method

A resonant converter, resonant current technology, applied in the direction of converting DC power input to DC power output, control/regulation systems, instruments, etc., can solve the gain deviation of each phase LLC resonant converter, threaten the reliable operation of the system, and the current of each phase Unequal problem, to achieve the effect of reducing the effective value of the fundamental wave, reducing the gain, and realizing the current sharing control

Active Publication Date: 2021-04-02
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inevitable parameter deviation of circuit components will cause the gain deviation of each phase LLC resonant converter, resulting in uneven current of each phase, threatening the reliable operation of the system

Method used

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  • Half-bridge llc resonant converter interleaved parallel circuit and its current sharing control method
  • Half-bridge llc resonant converter interleaved parallel circuit and its current sharing control method
  • Half-bridge llc resonant converter interleaved parallel circuit and its current sharing control method

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] like figure 1As shown, a half-bridge LLC resonant converter interleaved parallel circuit, two-phase half-bridge LLC resonant converters are interleaved in parallel, wherein the DC input side of each phase half-bridge LLC resonant converter is two capacitors in series, through the T-type switch The network is connected to the resonant cavity, and the secondary side of the transformer is connected to the rectifier circuit, the output capacitor and the load; the half-bridge LLC resonant converter circuit includes a capacitor (Ca), a capacitor (Cb), a MOS tube (Sza) connected to the auxiliary path, and a MOS tube ( Szb), MOS tube (Qa), MOS tube (Qb), resonant capacitor (Cr), resonant inductor (Lr), transformer (T), diode (Da), diode (Db) and output capacitor (Cout), by resonance The loop composed of capacitance (Cr), resonant inductance (Lr), and ex...

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Abstract

The invention provides an interleaved parallel circuit of half-bridge LLC resonant converters and a current sharing control method thereof. Two-phase half-bridge LLC resonant converters are interleaved in parallel, wherein the DC input sides of each half-bridge LLC resonant converter are two Capacitors are connected in series, the resonant cavity is connected through a T-type switch network, and the secondary side of the transformer is connected to the rectifier circuit, the output capacitor and the load; the present invention can insert the Vin / 2 state into the input voltage of the resonant cavity by adding an auxiliary path and a MOS tube to reduce resonance The effective value of the fundamental wave of the cavity input voltage can reduce the gain of the LLC resonant converter when the switching frequency remains unchanged; in the case of interleaved parallel connection at the same frequency, the average value of the resonant current of each phase and the resonant current of the parallel system can be detected Values ​​are compared to adjust the gain of the LLC resonant converter of each phase to achieve current sharing control, and all MOS transistors on the primary side can be turned on at zero voltage.

Description

technical field [0001] The invention relates to the field of power electronic converters, in particular to an interleaved parallel current sharing circuit and a control method thereof. Background technique [0002] The LLC resonant converter has the advantages of high efficiency and high power density, and has been widely used. The LLC resonant converter adopts frequency modulation control (PFM) to control the gain of the converter by controlling the switching frequency. The interleaved parallel connection of multi-phase LLC resonant converters can improve the system power level and reduce the output ripple, which is beneficial to reduce the output capacitance. Interleaved parallel multi-phase LLC resonant converters need to work at the same switching frequency, so as to maintain a fixed phase difference. However, the inevitable parameter deviation of circuit components will cause the gain deviation of each phase LLC resonant converter, resulting in uneven current of each ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335
CPCH02M3/33569H02M1/0058Y02B70/10
Inventor 吴旋律康祯赵鑫吴小华
Owner NORTHWESTERN POLYTECHNICAL UNIV
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