A soft start circuit and start method for a converter

A technology of soft start circuit and converter, which is applied in the direction of electrical components, output power conversion devices, etc., can solve the problems of large inrush current, etc., and achieve the effect of small voltage impact and reducing inrush current

Active Publication Date: 2021-10-08
SHENZHEN HIETECH ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] This method uses an external three-phase rectifier bridge rectifier circuit to charge the capacitor on the DC side, and the maximum charging voltage can only reach the phase voltage of the three-phase AC power supply. times, after the IGBT is turned on, the DC side capacitor voltage can be started without impact, but there will still be a large impact current

Method used

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  • A soft start circuit and start method for a converter
  • A soft start circuit and start method for a converter
  • A soft start circuit and start method for a converter

Examples

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Embodiment 1

[0035] like figure 1 As shown, Embodiment 1 of the present invention provides a soft-start circuit of a converter, which includes a first charging module and a second charging module.

[0036] The first charging module includes a first switch group 110, a three-phase rectifier 120, and a DC capacitor 130. The first switch group 110 is used to control the three-phase rectifier 120 to rectify the three-phase current into DC power to charge the DC capacitor 130 to the first DC capacitor 130. Voltage. The second charging module includes an AC input interface circuit 210, an energy storage circuit 220, and a control switch group 230 connected in sequence. The control switch group 230 and the energy storage circuit 220 are connected to a microprocessor 240, and the microprocessor 240 is used to provide the first pulse The wide control signal is used to control the switch group 230 to control the energy storage circuit 220 to charge the DC capacitor 130 to the second voltage accordi...

Embodiment 2

[0041] like figure 2 As shown, the second embodiment of the present invention is a further optimization of the circuit based on the soft-start circuit of the converter in the first embodiment of the present invention.

[0042] In this embodiment, the energy storage circuit 220 includes an LC circuit 221 connected to the AC input interface circuit 210 and a first voltage detection device 222 . Energy output voltage.

[0043] Preferably, the energy storage circuit 220 further includes a second voltage detection device 223 connected to the AC input interface circuit 210 for detecting the energy input voltage at the input end of the LC circuit 221 .

[0044] Further, the microprocessor 240 provides the first pulse width control signal according to the closed-loop control pulse width modulation logic of the converter.

[0045] Further, the control switch group 230 includes a switch of the first-phase half-bridge, a switch of the second-phase half-bridge, and a switch of the thir...

Embodiment 3

[0052] like image 3 and Figure 4 As shown, Embodiment 3 of the present invention provides a soft-start method for a converter on the basis of the above-mentioned embodiments. The method of this embodiment is applied to the soft-start circuit of a converter in any of the above-mentioned embodiments, and the method includes:

[0053] S100 , closing the first switch group so that the three-phase current passes through the three-phase rectifier, and the three-phase rectifier rectifies the three-phase current into a direct current to charge the direct current capacitor once.

[0054] S200 , the first switch group is turned off after the voltage of the DC capacitor reaches the first preset voltage. In this embodiment, the first voltage may be the amplitude of the three-phase current and voltage. times.

[0055] S300. Control the on or off of the switches of the control switch group according to the preset first pulse width control signal, so as to recharge the DC capacitor. T...

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PUM

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Abstract

The embodiment of the invention discloses a converter soft start circuit and a start method. The converter soft start device includes a first charging module and a second charging module. Wherein, the first charging module includes a first switch group, a three-phase rectifier, and a DC capacitor, and the first switch group is used to control the three-phase rectifier to rectify the three-phase current into DC to charge the DC capacitor to the first voltage; the second charging module includes an AC input interface circuit, an energy storage circuit, and a control switch group connected in sequence, and the control switch group and the energy storage circuit are connected to a microprocessor, and the microprocessor is used to provide the first pulse width control signal, and the control switch group controls the energy storage circuit to charge the DC capacitor to the second voltage according to the first pulse width control signal. The embodiment of the present invention realizes that the voltage impact in the DC side capacitor charging circuit is small when the converter is soft-started, and the inrush current in the DC side capacitor charging circuit is reduced.

Description

technical field [0001] Embodiments of the present invention relate to power electronic technologies, and in particular, to a soft-start circuit and a start-up method of a converter. Background technique [0002] As a power supply device that converts electrical energy from alternating current to direct current, rectifiers are indispensable in applications in all walks of life. In the 1970s, some people began to introduce PWM (Pulse Width Modulation, Pulse Width Modulation) technology into the field of rectification and achieved good results. Unity power factor and sinusoidal input current are obtained using PWM rectification. Compared with phase-controlled rectification, PWM rectifiers greatly reduce the demand for passive filter components or energy storage components such as capacitors and reactors, and their dynamic performance is also greatly improved. [0003] At present, the soft-start technology commonly used in converters is to connect the three-phase or single-pha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/08H02M1/36
CPCH02M1/083H02M1/36
Inventor 何玉成刘兵李斌李铁牛王博周文彭奕
Owner SHENZHEN HIETECH ENERGY TECH
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