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Frequency converter drive protecting circuit

A technology for driving and protecting circuits and frequency converters, applied to electrical components, output power conversion devices, etc., can solve the problems of expensive frequency converter protection and insufficient functions, and achieve the effect of perfect protection function and low cost

Active Publication Date: 2013-03-27
SHENZHEN SUNFAR ELECTRIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is to provide a comprehensive protection circuit for frequency converter drive in view of the above-mentioned problems such as expensive frequency converter protection and insufficient functions

Method used

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  • Frequency converter drive protecting circuit
  • Frequency converter drive protecting circuit

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Embodiment Construction

[0028] Such as figure 1 Shown is a logic block diagram of an embodiment of the inverter drive protection circuit of the present invention. In this embodiment, the circuit includes a sampling unit 11, a comparison unit 12, and a protection output unit 13, wherein the input of the sampling unit 11 is connected to the DC bus of the frequency converter, and the input of the comparison unit 12 is connected to the output of the sampling unit 11 The input terminal of the protection output unit 13 is connected to the output terminal of the comparison unit 12 . The above circuit outputs a protection signal through the protection output unit 13 when the current in the DC bus is too large (for example, a short circuit occurs).

[0029] The sampling unit 11 converts the current value of the inverter DC bus into a voltage value and outputs it to the input terminal of the comparison unit 12. If the comparison unit 12 judges that the input voltage value is greater than the first threshold v...

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Abstract

The invention relates to a frequency converter drive protecting circuit which comprises a sampling unit, a comparing unit and a protection outputting unit, wherein the input end of the sampling unit is connected to a direct current bus of a frequency converter and is used for converting a current value of the direct current bus into a voltage value for outputting; the input end of the comparing unit is connected to the output end of the sampling unit and used for outputting a switching-on signal when the voltage value of the input end is more than a first threshold; and the protection outputting unit is used for outputting a protection signal according to the switching-on signal output by the comparing unit. The invention realizes the monitoring on the current of the direct current bus of the frequency converter by the sampling and the comparison and has lower cost. In addition, the circuit also has perfect protection function.

Description

technical field [0001] The invention relates to the field of frequency converter drives, and more specifically relates to a comprehensive protection circuit for frequency converter drives. Background technique [0002] When the frequency converter is abnormal, in order to minimize or even reduce the loss caused by the frequency converter to zero, the existing frequency converters attach great importance to the protection function, and improve the effectiveness of the protection function while adding the protection function. [0003] At present, the protection function of the inverter is mainly realized through the following methods: [0004] (1) Based on HCPL-316J drive protection: By detecting the tube voltage drop of the IGBT during the conduction period, it is judged whether the IGBT is in an over-current or short-circuit state, and soft-off and shutdown protection measures are implemented; its internal collector-emitter voltage is integrated The undersaturation detectio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/32
Inventor 岑伟劲
Owner SHENZHEN SUNFAR ELECTRIC TECH
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