AC-DC resonant conversion circuit and control method thereof

A resonant conversion and circuit technology, which is applied in control/regulation systems, conversion of DC power input to DC power output, and conversion of AC power input to DC power output, etc., can solve the problems of low control difficulty, complex control and high conversion efficiency

Pending Publication Date: 2021-09-14
SHENZHEN VMAX NEW ENERGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Therefore, in view of the low conversion efficiency and complex control of the two-stage conversion isolation converter, the industr...

Method used

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  • AC-DC resonant conversion circuit and control method thereof
  • AC-DC resonant conversion circuit and control method thereof
  • AC-DC resonant conversion circuit and control method thereof

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Embodiment Construction

[0039] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0040]The main technical point of the present invention is to combine PFC rectification with the primary side input module in the prior art, which can not only complete the correction of power factor and current waveform, but also complete the adjustment of output voltage, and the two-stage conversion of the whole circuit shares the same switch The device makes the overall circuit structure simple and compact, easy to control, and can increase the power supply of the power supply equipment. In the charging mode, the energy flows from the three-phase power supply through the PFC-BUS module, which...

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Abstract

The invention discloses an AC-DC resonant conversion circuit and a control method thereof. The AC-DC resonant conversion circuit comprises an AC connecting end, a PFC-BUS conversion module, a transformer and a secondary side conversion module which are connected in sequence. The PFC-BUS conversion module adopts a control pulse signal generated by an SVPWM (Space Vector Pulse Width Modulation) algorithm to implement switch control, can perform power factor correction on input AC, converts the AC into DC transmits the DC to a primary side of the transformer; and a secondary side conversion module control pulse signal follows an PFC-BUS conversion module control pulse signal, and a phase shift control angle phi is arranged between the PFC-BUS conversion module control pulse signal and the secondary side conversion module control pulse signal. A switching tube is shared in the PFC-BUS conversion module, correction of a power factor and a current waveform can be completed, adjustment of output voltage can also be completed; and two-stage conversion of the whole circuit shares the same switching device, so that the whole circuit is simple and compact in structure, and control is simplified and convenient.

Description

technical field [0001] The invention relates to a power supply circuit, in particular to an AC-DC resonant conversion circuit and a control method thereof. Background technique [0002] The AC-DC converter is a power supply device that converts alternating current into direct current. At present, the common AC-DC isolation converter has a two-stage structure, the front stage is an ordinary PWM rectifier, and the rear stage is an isolated DC-DC converter. However, this type of converter has a two-stage structure with an energy storage link in the middle, which will reduce the working efficiency of the converter, and the front and rear stages in the two-stage structure need to be modulated and controlled separately, which greatly increases the control complexity. . The AC-DC converter architecture in the prior art is as figure 1 As shown, the energy of the three-phase or single-phase power supply is rectified by the PFC circuit, and the energy is stored on the DC bus. By adj...

Claims

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Application Information

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IPC IPC(8): H02M7/219H02M1/42H02M3/335
CPCH02M7/219H02M1/4241H02M3/33584H02M3/33592Y02B70/10
Inventor 刘钧冯颖盈徐金柱
Owner SHENZHEN VMAX NEW ENERGY CO LTD
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