Soft start circuit of converter

A technology of soft start circuit and converter, which is applied in the direction of electrical components, output power conversion devices, etc., and can solve the problems of large soft start current, large inrush current, and high heat dissipation requirements of soft start resistance

Active Publication Date: 2012-02-15
BEIJING SOARING ELECTRIC TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, at the moment of grid connection, due to the large voltage difference on both sides of the grid-connected switch, the inrush current is also large. , the soft-start current is large, and the heat dissipat

Method used

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  • Soft start circuit of converter
  • Soft start circuit of converter
  • Soft start circuit of converter

Examples

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Embodiment Construction

[0027] like figure 1 As shown, a soft start circuit of a converter includes a main circuit, and the main circuit includes a DC / DC conversion circuit, a DC / AC conversion circuit and a grid-connected switch connected in sequence, that is, the converter uses DC / DC and DC / AC two-step conversion. The electric energy can flow bidirectionally between the DC load and the AC grid. When the electric energy flows from the DC load to the AC grid, the converter is in a discharging working state, otherwise it is in a charging working state. The DC / DC conversion circuit includes one or more mutually independent DC channels, at least one of which is a chopper DC channel provided with a DC chopper circuit, and the input end of the DC channel is a load connection end , such as batteries, electronic loads, etc., the output end is equipped with a DC bus capacitor for forming its output voltage. The DC bus capacitor can be used to temporarily store electric energy from the load or the AC grid si...

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PUM

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Abstract

The invention relates to a soft start circuit of a converter. The main circuit of the soft start circuit comprises a DC (direct current)/DC converting circuit, a DC/AC (alternating current) converting circuit and a paralleling switch, wherein the DC/DC converting circuit comprises one or more mutually independent DC channels, at least one DC channel is a chopper DC channel on which a DC chopper circuit is arranged; the input end of the DC channel is a load connecting end, the output end of the DC channel is provided with a DC bus capacitor for forming the output end voltage; one or more soft start branches provided with soft start switches are connected between the load connecting end and the power supply connecting end of the paralleling switch; at least one of the one or more soft start branches is provided with a soft start resister, and the at least one soft start branch provided with the soft start resister corresponds to the chopper DC channel. By using the soft start circuit of a converter, the soft start current is small, the thermal design is easier, the paralleling impact current is small, and the soft start circuit can be widely used in the charging process of a DC load.

Description

technical field [0001] The invention relates to a soft start circuit of a converter in the field of power electronic conversion technology, in particular to a soft start circuit of a converter with two DC / DC and DC / AC conversions, which can be widely used in chargers, adapters, In the charge and discharge test circuit of switching power supply, storage battery and other equipment. Background technique [0002] For the existing converters that include DC / DC and DC / AC conversion twice, the soft start circuit corresponding to its charging operation usually has the following characteristics: a soft start resistor is connected in parallel at both ends of the grid-connected switch. Let the current flow through the soft-start resistor, the larger the resistance value of the soft-start resistor, the smaller the soft-start current, so as to achieve the purpose of reducing the soft-start current. [0003] However, at the moment of grid connection, due to the large voltage difference ...

Claims

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Application Information

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IPC IPC(8): H02M1/36
Inventor 蔡明王仕城
Owner BEIJING SOARING ELECTRIC TECH CO LTD
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