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Precharge soft starting circuit for three-phase voltage type bi-directional PWM current transformer

A soft-start circuit, three-phase voltage technology, applied in electrical components, output power conversion devices, etc., can solve problems such as current shock and affect service life, and achieve the effect of avoiding current shock and prolonging service life.

Inactive Publication Date: 2016-07-13
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
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Problems solved by technology

[0004] In order to overcome the deficiency that the start-up process of the existing three-phase voltage type bidirectional PWM converter is easily affected by the current impact and affect the service life, the present invention provides a three-phase voltage type inverter that can effectively avoid the current impact during the start-up process and prolong the service life. Precharge Soft-Start Circuit of Bidirectional PWM Converter

Method used

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  • Precharge soft starting circuit for three-phase voltage type bi-directional PWM current transformer
  • Precharge soft starting circuit for three-phase voltage type bi-directional PWM current transformer
  • Precharge soft starting circuit for three-phase voltage type bi-directional PWM current transformer

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Embodiment Construction

[0013] The present invention will be further described below in conjunction with the accompanying drawings.

[0014] refer to figure 1 and figure 2 , a pre-charging soft-start circuit suitable for three-phase voltage-type bidirectional PWM converters, the soft-start circuit includes a first contactor K1, a three-phase diode rectifier bridge TM, a BUCK-BOOST buck-boost circuit, a second The contactor K2 and the DSP processor, the three-phase AC voltage source is connected to the AC side of the three-phase diode rectifier bridge TM through the first contactor, and the DC side of the three-phase diode rectifier bridge TM is connected to the BUCK-BOOST step-down circuit, The BUCK-BOOST buck-boost circuit is connected to the second contactor K2, and the second contactor K2 is connected to both sides of the DC terminal bus capacitor, and the first contactor K1 and the BUCK-BOOST buck-boost circuit The controlled terminal of the second contactor K2 is connected with the control te...

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Abstract

A precharge soft starting circuit for a three-phase voltage type bi-directional PWM current transformer comprises a first contactor K1, a three-phase diode rectifier bridge TM, a BUCK-BOOST circuit, a second contactor K2 and a DSP, wherein a three-phase alternating voltage source is connected with the alternating-current side of the three-phase diode rectifier bridge TM through the first contactor, the direct-current side of the three-phase diode rectifier bridge TM is connected with the BUCK-BOOST circuit, the BUCK-BOOST circuit is connected with the second contactor K2, the second contactor K2 is connected with the two sides of a direct-current end bus capacitor, and the first contactor K1, the controlled end of the BUCK-BOOST circuit and the second contactor K2 are all connected with the control end of the DSP. Current surge in the starting process is effectively avoided, so that service life is prolonged.

Description

technical field [0001] The invention relates to a technology of a three-phase voltage-type bidirectional PWM converter, in particular to a pre-charging soft-start circuit for a three-phase voltage-type bidirectional PWM converter. Background technique [0002] In recent years, with the continuous development of industry, some high-tech sensitive equipment has higher and higher requirements for power quality. In order to obtain higher power quality, the research of three-phase voltage-type bidirectional PWM converter has gradually been paid attention to. . The three-phase voltage-type bidirectional PWM converter has the advantages of low harmonics of grid-side current, unit power factor, bidirectional energy flow and constant DC voltage, etc., and can realize "green conversion" of electric energy. [0003] In the process of starting the three-phase voltage-type bidirectional PWM converter, the problem of current impact is particularly important. Excessive impact current will...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/36H02M1/32
CPCH02M1/36H02M1/32
Inventor 潘国兵胡亚腾王坚峰张任汤文轩
Owner ZHEJIANG UNIV OF TECH
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