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Phase-shifted full-bridge peak current control circuit based on PWM (Pulse Width Modulation) controller

A peak current control, phase-shifting full-bridge technology, applied in electrical components, output power conversion devices, conversion of AC power input to DC power output, etc., can solve problems such as oscillation frequency drift

Active Publication Date: 2015-04-08
XJ ELECTRIC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a phase-shift full-bridge peak current control circuit based on a PWM controller to solve the problem that the existing slope compensation circuit easily causes oscillation frequency drift

Method used

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  • Phase-shifted full-bridge peak current control circuit based on PWM (Pulse Width Modulation) controller
  • Phase-shifted full-bridge peak current control circuit based on PWM (Pulse Width Modulation) controller
  • Phase-shifted full-bridge peak current control circuit based on PWM (Pulse Width Modulation) controller

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Embodiment Construction

[0019] The present invention will be further introduced below in conjunction with the accompanying drawings and specific embodiments.

[0020] Such as image 3 Shown is the schematic diagram of the embodiment of the slope compensation and control circuit of the PWM controller of the present invention. It can be seen from the figure that the circuit includes a PWM controller, and the inverting input terminal RAMP pin of the PWM comparator of the PWM controller is connected with slope compensation and The control circuit, the slope compensation and control circuit includes a slope generation circuit and a slope compensation control circuit; the slope generation circuit includes an operational amplifier U1 connected to the CT pin of the oscillating triangle wave end, and the non-inverting input end of the operational amplifier is used to connect with the CT pin, Its inverting input terminal is connected to its output terminal, and the output terminal is used to connect to the RAM...

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Abstract

The invention discloses a phase-shifted full-bridge peak current control circuit based on a PWM (Pulse Width Modulation) controller. A slope compensation and control circuit composed of a slope generating circuit and a slope compensation control circuit is added. A ramp signal is added on a rising edge of current waveform by the slope generating circuit, so that the slope of the rising edge is increased and the slope of the rising edge of the current waveform becomes greater than that of a falling edge. An interference signal is finally converged after passing through the circuit, so that topology can normally work. The slope compensation control circuit is additionally provided with an and gate circuit on the basis of the peak current control circuit, so that a triangular wave is added as a slope compensation signal when a bridge arm has output and the slope of a current sampling signal is increased. The compensation signal is locked when a diagonal bridge arm has no output, so that no interference is caused to a duty ratio modulation circuit due to the addition of the ramp signal.

Description

technical field [0001] The invention relates to a phase-shifting full-bridge peak current control circuit based on a PWM controller. Background technique [0002] Phase-shifted full bridge is an ideal power electronic conversion topology, which is widely used in various high-power rectification and inverter devices. Its control methods include: peak current control and voltage control modes. Among them, the voltage control method is not sensitive to the response of the current change, and the response speed is slow; compared with the voltage control technology, the power conversion circuit can limit the current wave by wave in the peak current control mode, and adjust the output more sensitively, which has superior load Adjustment characteristics and anti-input disturbance ability, fast dynamic response, good adjustment performance, easy to realize current limiting and over-current protection, can effectively suppress the saturation problem caused by transformer bias and eas...

Claims

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Application Information

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IPC IPC(8): H02M7/5395
Inventor 邓长吉李杰王攀攀徐亚超黄栋杰
Owner XJ ELECTRIC
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