A soft start circuit

A soft-start circuit and circuit technology are applied in electrical components, output power conversion devices, and AC power input is converted into AC power output, etc. Effect

Inactive Publication Date: 2017-04-05
WEST ANHUI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The current popular soft start circuit is to use frequency converter to drive electrical equipment. The frequency converter controls the load current by changing the frequency of the drive power supply. The effect is very good in the case of large load capacity, but for small loads, its cost is higher

Method used

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Embodiment Construction

[0016] A soft start circuit, including an input connection terminal for connecting 220V single-phase alternating current, its output end is connected with a power conversion circuit 2 through a protection circuit 1, and the power conversion circuit 2 supplies synchronous signal detection circuit 3, trigger circuit 4 and main The circuit 5 supplies power, the output end of the synchronous signal detection circuit 3 is connected to the input end of the trigger circuit 4, the output end of the trigger circuit 4 is connected to the input end of the main circuit 5, and the output end of the main circuit 5 is connected to the load through the output terminal. The protection circuit 1 plays the role of short-circuit protection; the power conversion circuit 2 obtains direct current through rectification, and provides working power for the chips in the circuit; the synchronization signal detection circuit 3 generates a synchronization signal; the trigger circuit 4 is used to trigger the ...

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Abstract

The invention relates to a simple soft start circuit which comprises an input wiring terminal for being connected with 220V single-phase alternating current, wherein the output end of the input wiring terminal is connected with a power conversion circuit through a protection circuit; the power conversion circuit respectively supplies power to a synchronizing signal detection circuit, a trigger circuit and a main circuit; the output end of the synchronizing signal detection circuit is connected with the input end of the trigger circuit; the output end of the trigger circuit is connected with the input end of the main circuit; the output end of the main circuit is connected with a load through an output wiring terminal. Alternating current voltage outputted by the main circuit is linearly increased from 0V to 220V in set time by the trigger circuit; the voltage linearity is increased during start, so that start current is increased from 0 to a rated value, and further the aim of soft start is achieved. The simple soft start circuit disclosed by the invention is simple and the devices are low in price, so the control over soft start of the load is realized under the condition of low cost.

Description

technical field [0001] The invention relates to the technical field of electrical control, in particular to a soft start circuit. Background technique [0002] The starting current generated by general electrical equipment, especially non-resistive loads, at the moment of starting is very large. The large starting current will have an impact on the power grid, and will also cause adverse effects or even damage to the electrical equipment itself. If the current of the electrical equipment can reach the rated value linearly from zero when the electrical equipment is started, the impact and surge current can be fundamentally reduced. The soft starter is this kind of device, which can use electric equipment to have a certain delay from starting to rated state, which acts as a buffer. [0003] The current popular soft-start circuit is to use frequency converter to drive electrical equipment. The frequency converter controls the load current by changing the frequency of the drive...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/36H02M1/32
CPCH02M5/2573
Inventor 翁志远程颖方杰翁志刚孔敏秦广龙胡永刚杨勇
Owner WEST ANHUI UNIV
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