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Hierarchical voltage soft-start circuit for three-phase voltage PWM rectifier and control method thereof

A soft-start circuit, three-phase voltage technology, applied in the direction of electrical components, output power conversion devices, etc., can solve the problems of long startup time, large inrush current, affecting the life of components, etc., to achieve fast startup speed and eliminate inrush current. , to avoid the effect of continuous growth

Active Publication Date: 2014-08-06
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

Due to the large capacitance on the DC side, a large inrush current will be generated at the moment the circuit starts, which not only affects the life of the components in the circuit, but also has a great impact on the power grid.
The main purpose of the soft start technology is to reduce the inrush current during start. The current soft start circuit usually connects the current limiting resistor in parallel with the switch tube or the current limiting resistor in parallel with the relay. The disadvantage of this technology is that the starting time is long, especially for high-power three For a phase-voltage PWM rectifier, the start-up time will be more than 10s, and at the same time, a large inrush current will still appear after the soft start

Method used

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  • Hierarchical voltage soft-start circuit for three-phase voltage PWM rectifier and control method thereof

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Embodiment Construction

[0014] The implementation of the present invention will be further described below in conjunction with the accompanying drawings, but the implementation of the present invention is not limited thereto.

[0015] Such as figure 1 As shown, it is a schematic diagram of a three-phase voltage-type PWM rectifier comprising a soft start circuit of the present invention, including: a three-phase AC voltage source Es, a three-phase reactor L, a first switching tube IGBT1, a second switching tube IGBT2, a third switch Tube IGBT3, fourth switching tube IGBT4, fifth switching tube IGBT5, sixth switching tube IGBT6, soft start circuit 1, load R L .

[0016] The soft start circuit 1 includes: the seventh switching tube IGBT7, the eighth switching tube IGBT8, the first capacitor C 0 , the second capacitance C 1 , DSP processor; the collector of the seventh switching tube IGBT7 is connected to the collector of the positive output terminal P+ of the three-phase rectifier bridge and the eigh...

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Abstract

The invention discloses a hierarchical voltage soft-start circuit for a three-phase voltage PWM rectifier and a control method thereof. The hierarchical voltage soft-start circuit comprises a seventh switch tube, an eighth switch tube, a first capacitor, a second capacitor, and a DSP (digital signal processor). A collector of the seventh switch tube is connected with the output end of an anode of a three-phase rectifier bridge and a collector of the eighth switch tube; an emitter of the seventh switch tube is connected with an anode of the first capacitor; an emitter of the eighth switch tube is connected with an anode of the second capacitor and one end of a load; a cathode of the second capacitor is connected with the output end of a cathode of the three-phase rectifier bridge, the other end of the load and a cathode of the first capacitor. The hierarchical voltage soft-start circuit has the advantages that soft starting is achieved by subjecting two ends of the first capacitor to hierarchical voltage charging and starting speed is high.

Description

technical field [0001] The invention relates to three-phase rectification technology, in particular to a three-phase voltage type PWM rectifier voltage classification soft start circuit. Background technique [0002] The three-phase voltage-type PWM rectifier has many advantages such as unity power factor, low current harmonics, bidirectional flow of energy, etc., and has become one of the hot topics in the field of power electronics. The soft start technology of the three-phase voltage PWM rectifier is one of the key technologies for the application of the three-phase voltage PWM rectifier. Due to the large capacitance on the DC side, a large inrush current will be generated at the moment the circuit is started, which not only affects the life of the components in the circuit, but also has a great impact on the power grid. The main purpose of the soft start technology is to reduce the inrush current during start. The current soft start circuit usually connects the current ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/36
Inventor 杜贵平朱天生方俊翔
Owner SOUTH CHINA UNIV OF TECH
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