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Control method of rectifier circuit switching tube of digital phase-shifting full-bridge DC converter

A technology of DC converter and full-bridge inverter circuit, which is applied in the direction of converting DC power input into DC power output, control/regulation system, and AC power input into DC power output, etc., which can solve low-voltage voltage fluctuation and output efficiency drop And other issues

Active Publication Date: 2019-04-05
UNITED AUTOMOTIVE ELECTRONICS SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this control method is simple, there are two problems: one is that the low-voltage side LC filter circuit will generate certain low-voltage voltage fluctuations when the inductor current freewheeling and cut-off modes are switched, and the other is that in the inductor current cut-off mode, the shutdown The rectifier switching tube in the rectifier circuit will lead to a decrease in output efficiency

Method used

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  • Control method of rectifier circuit switching tube of digital phase-shifting full-bridge DC converter
  • Control method of rectifier circuit switching tube of digital phase-shifting full-bridge DC converter
  • Control method of rectifier circuit switching tube of digital phase-shifting full-bridge DC converter

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Embodiment 1

[0031] Digital phase-shifted full-bridge DC converters such as figure 1 As shown, its main circuit includes a full-bridge inverter circuit, a transformer, a rectifier circuit, and an LC filter circuit. The full-bridge inverter circuit on the high-voltage side of the primary side of the transformer includes four inverter switches (such as MOSFETs) A, B, C, D. The rectification circuit on the low-voltage side of the secondary side of the transformer includes two rectification switch tubes (such as MOSFETs) E, F.

[0032] A rectification circuit switching tube control method for a digital phase-shifting full-bridge DC converter, such as Figure 7 shown, including the following steps:

[0033] 1. Collect the actual load current I of the phase-shifted full-bridge DC converter O ;

[0034] 2. If I O OB , proceed to step three, I OB is the critical load current;

[0035] 3. If I O >I off , I off To set the maximum shutdown current, proceed to step 4, otherwise proceed to ste...

Embodiment 2

[0044] Based on the digital phase-shift full-bridge DC converter control method of the rectifier circuit switching tube of the first embodiment, the critical load current I OB , can be determined by the following method:

[0045]

[0046] where V S is the bus voltage of the digital phase-shifting full-bridge DC converter (that is, the input voltage of the full-bridge inverter circuit), L is the inductance of the LC filter circuit (the nominal lower limit of the device can be taken), f S P is the switching frequency of the inverter switching tube, and P is the output duty ratio of the low-voltage side of the transformer. The output duty ratio P of the low-voltage side of the transformer can be set or calculated in real time.

[0047] The rectifier circuit switching tube control method of the digital phase-shifting full-bridge DC converter of the second embodiment, by collecting the bus voltage of the digital phase-shifting full-bridge DC converter, and combining the output...

Embodiment 3

[0049] Based on the rectifier circuit switching tube control method of the digital phase-shifting full-bridge DC converter of the second embodiment, the output duty ratio P of the low-voltage side of the transformer can be PI based on the difference between the measured voltage value of the low-voltage side of the transformer and the target value of the low-voltage voltage. (proportional-integral) control, or by performing PI control on the difference between the transformer low-voltage side current measurement value and the low-voltage current target value, such as Figure 8 shown.

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Abstract

The invention discloses a rectification circuit switching tube control method of a digital phase shift full-bridge DC converter. Actual load current IO and critical load current IOB are compared, and a current inductive current mode is determined; if the actual load current IO is less than the critical load current IOB and greater than the preset maximum turn-off current Ioff, inductive current interrupting time TO is calculated; a rectification switching tube E is controlled to be conducted after a lagging bridge arm inversion switching tube A is conducted, and the rectification switching tube E is controlled to be turned off before the lagging bridge arm inversion switching tube A for time duration TO; and a rectification switching tube F is controlled to be conducted after a lagging bridge arm inversion switching tube B is conducted, and the rectification switching tube F is controlled to be turned off before the lagging bridge arm inversion switching tube B for time duration TO. According to the rectification circuit switching tube control method, output voltage fluctuation caused by switching of an inductive current continuous mode and an inductive current interrupting mode can be reduced, and the output efficiency of inductive current interrupting can be enhanced.

Description

technical field [0001] The invention relates to new energy vehicle technology, in particular to a method for controlling a switch tube of a rectifier circuit of a digital phase-shifting full-bridge DC converter. Background technique [0002] In the energy conversion system of new energy vehicles, the DC-DC converter realizes the function of converting electric energy from high-voltage voltage to low-voltage voltage (Buck). [0003] Digital phase-shifted full-bridge DC converters such as figure 1 As shown, the main circuit includes a full-bridge inverter circuit, a transformer, a rectifier circuit, and an LC filter circuit. The full-bridge inverter circuit on the high-voltage side of the primary side of the transformer includes four inverter switches (such as MOSFETs) A, B, C, and D , The rectification circuit on the low-voltage side of the secondary side of the transformer includes two rectification switch tubes (such as MOSFET) E, F. Its working method is that high-voltag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/217H02M3/335
Inventor 陈磊敏代朋
Owner UNITED AUTOMOTIVE ELECTRONICS SYST
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