Disperse phase-shifting angle control method of phase-shifting full-bridge DC-DC (Direct Current-Direct Current) converter, and device of control method

Abstract

The invention discloses a disperse phase-shifting angle control technique and a device of a phase-shifting full-bridge DC-DC (Direct Current-Direct Current) converter. A controller generates two complementary signals P1 and P2 with dead zone time as driving pulse signals of two switching tubes on an advanced bridge arm; the controller performs phase-shifting processing on the two signals P1 and P2 to generate two groups of signals P3H and P3H as well as P3L and P3L with different phase-shifting angles; and the controller directly selects appropriate signal outputs from the two groups of signals P3H and P3H as well as P3L and P3L as effective driving pulse signals of two switching tubes on a lagging bridge arm according to an output state of a switching converter to achieve control of the phase-shifting full-bridge DC-DC converter. The control technique and the device have the advantages that a control loop is simple and reliable; no compensating network is required; and the transient response speed is high.

Description

technical field [0001] The invention relates to a discrete phase-shift angle control method and device for a phase-shift full-bridge DC-DC converter. Background technique [0002] In order to improve the frequency and power density of the converter, it is necessary to reduce the switching loss of the switching tube, so people have proposed the resonant soft switching technology; the resonant soft switching technology makes the switching tube realize zero voltage conduction or zero current by adding a resonant element in the circuit Turn off, thereby reducing the switching loss; however, the resonant soft switching technology generally needs to be controlled by Frequency Modulation (FM), so there are disadvantages such as complicated control methods and difficult output filter design. [0003] In the 1990s, people proposed the phase-shifting full-bridge DC-DC converter technology; on the one hand, the phase-shifting full-bridge DC-DC converter controls the output voltage of t...

AI Technical Summary

Problems solved by technology

[0002] In order to improve the frequency and power density of the converter, it is necessary to reduce the switching loss of the switching tube, so people have proposed the resonant soft switching technology; the resonant soft switching technology makes the switching tube realize zero voltage conduction or zero current by adding a resonant element in the circuit Turn off, thereby reducing the switching loss; but the resonant soft switching technology generally needs to be controlled by frequency modulation (Frequency Modulation, FM), so there are disadvantages such as complicated control methods and difficult output filter design

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