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A phase-shifted full-bridge circuit topology low-voltage output mechanism and low-voltage output method

A phase-shifting full-bridge, low-voltage output technology, applied in output power conversion devices, DC power input conversion to DC power output, power supply testing, etc. high effect

Active Publication Date: 2021-07-23
HEFEI KEWELL POWER SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is how to solve the problem that the DC test power supply of the phase-shifted full-bridge topology cannot output low voltage when it is unloaded or lightly loaded

Method used

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  • A phase-shifted full-bridge circuit topology low-voltage output mechanism and low-voltage output method
  • A phase-shifted full-bridge circuit topology low-voltage output mechanism and low-voltage output method
  • A phase-shifted full-bridge circuit topology low-voltage output mechanism and low-voltage output method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] figure 1 The circuit diagram of the low-voltage output mechanism of the phase-shifted full-bridge circuit topology provided for Embodiment 1 of the present invention, such as figure 1 , a phase-shifting full-bridge circuit topology low-voltage output mechanism, including a control module 1, a phase-shifting full-bridge circuit 2, a transformer T3, a rectifier circuit 4, and an LC filter circuit 5, the primary side of the transformer T3 and the phase-shifting full-bridge circuit 2 connected, the phase-shifted full bridge circuit 2 is connected to an external power supply, the secondary side of the transformer T3 is connected to a rectifier circuit 4, and the rectifier circuit 4 is connected to an LC filter circuit 5;

[0046] The phase shifting full bridge circuit 2 is also electrically connected to the control module 1 .

[0047] The external power supply is connected to the phase-shifting full-bridge circuit 2 for power supply, and the external power supply is a DC po...

Embodiment 2

[0065] A low-voltage output method based on the phase-shifted full-bridge circuit topology low-voltage output mechanism described in Embodiment 1, the steps are as follows:

[0066] S1, the minimum output voltage value of the open-loop test; and the minimum current value of the closed-loop test, draw the U-I coordinate axis according to the minimum output voltage value and the minimum current value, determine the phase shift mode area, PWM (Pulse Width Modulation, PWM (Pulse Width Modulation, yes A very effective mode that uses the digital output of the microprocessor to control the analog circuit) mode area;

[0067]S11. In actual use, due to different hardware selection parameters, it is necessary to test the minimum output voltage value when the phase shift angle is 0 in phase shift mode; in phase shift mode, use open loop test, output no load, and Set the phase shift angle to 0, then output the voltage, measure the output voltage value at this time, and record it as Umin; ...

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Abstract

The invention relates to a topological low-voltage output mechanism of a phase-shifting full-bridge circuit, which includes a transformer T, a phase-shifting full-bridge circuit, a rectifier circuit and an LC filter circuit. The primary side of the transformer T is connected to the phase-shifting full-bridge circuit. The phase full bridge circuit is connected to the external power supply, the secondary side of the transformer T is connected to the rectification circuit, and the rectification circuit is connected to the LC filter circuit. The invention also discloses a low-voltage output method. In the invention, the external power supply is connected to the phase-shifting full-bridge circuit for power supply, and the external power supply is a DC power supply, and then sequentially passes through the phase-shifting full-bridge circuit, transformer T, rectifier circuit and The filter circuit outputs the voltage, so that when the energy is transferred to the secondary side of the transformer T through the transformer T, under no-load or light-load conditions, even if the output terminal does not have enough load, it can output low voltage.

Description

technical field [0001] The invention relates to the field of measurement and testing of electronic equipment, in particular to a phase-shifting full-bridge circuit topology low-voltage output mechanism and a low-voltage output method. Background technique [0002] In the field of electronic technology, DC test power supply is one of the indispensable test instruments for power electronics enterprises. Due to the wide variety of tested equipment and different functions, it is required that the DC test power supply can provide a wide range of output to meet various test environments. , and the phase-shifted full-bridge is currently a commonly used topology for high-frequency DC test power supplies. [0003] The invention patent with the publication number "CN104467434B" discloses a transient phase-shift control method for a dual-active full-bridge DC converter, which belongs to the field of power electronics technology; The AC output side of the first full bridge in the DC co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335G01R31/40
CPCG01R31/40H02M3/33515H02M3/33523
Inventor 钟钢炜赵涛蔡振鸿唐德平
Owner HEFEI KEWELL POWER SYST CO LTD