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Double-loop control circuit of phase-shifted full-bridge synchronous rectification circuit

A synchronous rectification, phase-shifting full-bridge technology, applied in control/regulation systems, high-efficiency power electronic conversion, electrical components, etc., can solve the problems of different magnetic induction intensity, transformer loss of energy transfer function, etc.

Active Publication Date: 2014-06-11
UNITED AUTOMOTIVE ELECTRONICS SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] When the voltage loaded on both ends of the main transformer is different, the rising slope of the magnetic induction intensity will also be different. If the phase shift value of the positive and negative half cycles is kept the same at this time, the magnetic induction intensity will be biased toward the side with a higher voltage. In severe cases Lead to magnetic saturation of the transformer, so that the transformer loses the function of transferring energy, such as image 3 shown

Method used

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  • Double-loop control circuit of phase-shifted full-bridge synchronous rectification circuit
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  • Double-loop control circuit of phase-shifted full-bridge synchronous rectification circuit

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Embodiment 1

[0055] The dual-loop control circuit of the phase-shifted full-bridge synchronous rectification circuit, such as Figure 4 As shown, it includes a current sampling module and a microprocessor;

[0056] The current sampling module is used to detect the bus current of the phase-shifted full-bridge synchronous rectification circuit, and conduct the bus current of the phase-shifted full-bridge synchronous rectification circuit in the first phase according to the frequency of the PWM signal output by the microprocessor. Sampling to obtain the first current sampling value I1, sampling in the second phase according to the frequency of the PWM signal output by the microprocessor to obtain the second current sampling value I2, the difference between the first phase and the second phase is 180 degrees, and output the first The current sampling value I1 and the second current sampling value I2 are sent to the microprocessor;

[0057] The microprocessor, such as Figure 5 As shown, it i...

Embodiment 2

[0070] Based on the dual-loop control circuit of the phase-shifted full-bridge synchronous rectification circuit of Embodiment 1, the magnetic bias state control module calculates the forward bias correction value ΔAD, negative direction The process of offset correction value ΔBC is:

[0071] 1. ΔAD 0 =0, ΔBC 0 =0, ΔAD 0 is the initial value of forward bias correction value, ΔBC 0 is the initial value of the negative bias correction value; the initial value of n is 1;

[0072] 2. If I1 n ≥I2 n , and (I1 n -I2 n ) / F>a, proceed to step 3; if I1 n n , and (I2 n -I1 n ) / F>a, proceed to step 8; I1 n is the first current sampling value of the nth sampling period, I2 n is the second current sampling value of the nth sampling period, a is a positive number, preferably a is a positive number less than 10% (for example, a=5%), and F is the reference current (for example, F=1A);

[0073] 3. If ΔAD n-1 ≥0 and ΔBC n-1 =0, proceed to step 4; if ΔAD n-1 =0 and ΔBC n-1 >0, pr...

Embodiment 3

[0086] Based on the dual-loop control circuit of the phase-shifted full-bridge synchronous rectification circuit of embodiment two, the microprocessor, such as Figure 7 As shown, also includes a second comparison output module;

[0087] In the second comparison output module, an input terminal is connected to set the minimum phase shift value, and an input terminal is connected to the full-scale phase-shift value output by the first comparison output module, and the output limit phase-shift value; if the full-scale phase shift value is greater than If the minimum phase shift value is set, the output limit phase shift value is equal to the full scale phase shift value; if the full scale phase shift value is less than or equal to the set minimum phase shift value, the output limit phase shift value is equal to the set minimum phase shift value ; The set minimum phase shift value is greater than the maximum offset correction value Br;

[0088] In the third subtractor, the two i...

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Abstract

The invention discloses a double-loop control circuit of a phase-shifted full-bridge synchronous rectification circuit. Input signals include a phase-shifted full-bridge synchronous rectification circuit output voltage signal and two bus current sampling signals, a value of the feedback current in a current loop is an average value of two bus sampling currents, a voltage loop phase-shifted value and a current loop phase-shifted value are respectively obtained through PI calculation of a voltage loop and the current loop, and the smaller one of the voltage loop phase-shifted value and the current loop phase-shifted value is used as a magnetic bias control standard phase-shifted value; a magnetic bias state control module is arranged, and a positive bias modification value deltaAD and a negative bias modification value deltaBC are output according to the two bus current sampling signals; after differences between the standard phase-shifted value and the deltaAD and the deltaBC are obtained, two phase-shifted values of finally-output PWM signals are obtained, phase-shifted values in the PWM signal positive and negative semi-cycle energy transmitting periods are respectively adjusted to enable voltage-second products in the positive and negative semi-cycle periods to be same, different voltages across the two ends of a main transformer are compensated, the aim of controlling magnetic biases is achieved, a hardware circuit is slightly changed, and implementation is conveniently achieved.

Description

technical field [0001] The invention relates to an automotive electronic DC power converter (DC / DC converter), in particular to a double-loop control circuit of a phase-shifting full-bridge synchronous rectification circuit. Background technique [0002] In recent years, with the development of microprocessor (MCU) technology, the control part of switching power supply is gradually developing towards digitalization. The traditional analog control switching power supply control system uses error amplifiers, sawtooth wave generators and PWM (pulse width modulation) comparators to adjust the output voltage of switching power supplies. modification and other shortcomings. The control system of digital control switching power supply uses AD (analog to digital) converter, digital compensator and digital PWM generator to adjust the output voltage of switching power supply. It has the advantages of simple peripheral circuit, less components and flexible control algorithm, etc. adv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/33592Y02B70/10H02M1/0009H02M3/33573
Inventor 陈磊敏郑海涛张东海
Owner UNITED AUTOMOTIVE ELECTRONICS SYST
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