A kind of charge control method of DC bus capacitor of frequency converter and realizing circuit thereof

A kind of charge control method of DC bus capacitor of frequency converter and realizing circuit thereof

  • CN 102,594,129 B
  • Filed: 01/08/2011
  • Issued: 10/14/2015
  • Est. Priority Date: 01/08/2011
  • Status: Active Grant
First Claim
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1. the charging circuit of a DC bus capacitor of frequency converter, it is characterized in that:

  • described circuit comprises the power input interface VD of the auxiliary power output end be connected in frequency converter, delayed startup switch, driver module and relay, power input interface VD input power through delayed startup switch to driver module, delayed startup switch control rule driver module break-make, driver module drives relay work, the normally opened contact of relay is connected in parallel on the current-limiting resistance R1 two ends on frequency converter bus, described delayed startup switch adopts the voltage stabilizing didoe Z1 and filter capacitor C1 that are connected in series between power input interface VD and ground, described driver module adopts triode Q2, the base stage of triode Q2 is connected to the common port of voltage stabilizing didoe Z1 and filter capacitor C1, the grounded emitter of triode Q2, the collector electrode of triode Q2 is connected with one end of the drive coil of relay, another termination VD of the drive coil of relay, also latching circuit is included in described circuit, described latching circuit controls the break-make of triode Q2, described latching circuit adopts triode Q1, the base stage of triode Q1 is connected on the collector electrode of triode Q2, the emitter of triode Q1 is connected on power input interface VD, the collector electrode of triode Q1 is connected with the negative pole of voltage stabilizing didoe Z3, the positive pole of voltage stabilizing didoe Z3 is connected to the common port place of voltage stabilizing didoe Z1 and filter capacitor C1, when frequency converter powers on, charged to dc-link capacitance E1 by current-limiting resistance R1, after frequency converter powers on, drive circuit works is controlled from the accessory power supply power taking in frequency converter, drive circuit drives relay, the normally opened contact of relay is connected in parallel on current-limiting resistance R1 two ends, utilize the normally opened contact of relay by current-limiting resistance R1 short circuit, after the normally opened contact adhesive of relay, latching circuit maintains the normally opened contact adhesive of relay.

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