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Bus capacitor pre-charging circuit and method, frequency converter and air conditioning equipment

A pre-charging circuit and bus capacitor technology, applied in battery circuit devices, current collectors, circuit devices, etc., can solve the problems of circuit impact and large instantaneous current during charging and charging, so as to adjust charging current, improve safety, and flexibly charge current. Effect

Pending Publication Date: 2020-09-15
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention provides a bus capacitor pre-charging circuit, method, frequency converter and air-conditioning equipment to solve the problem in the prior art that the instantaneous charging current is relatively large and impacts the circuit

Method used

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  • Bus capacitor pre-charging circuit and method, frequency converter and air conditioning equipment
  • Bus capacitor pre-charging circuit and method, frequency converter and air conditioning equipment
  • Bus capacitor pre-charging circuit and method, frequency converter and air conditioning equipment

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Embodiment 1

[0054]This embodiment provides a bus capacitor pre-charging circuit. The number of bus capacitors is at least two. In this embodiment, the DC bus includes a first bus capacitor C1 and a second bus capacitor C2, and the first bus capacitor C1 and The second bus capacitor C2 is connected in series between the first line and the second line of the DC bus. The first bus capacitor C1 is connected in parallel to set the first equalizing resistor R1, and the two ends of the second bus capacitor C2 are connected in parallel to set the second equalizing resistor. piezoresistor R2, in order to realize the charging of the above-mentioned first bus capacitor C1 and second bus capacitor C2, figure 1 It is a structural diagram of the bus capacitor pre-charging circuit according to the first embodiment of the present invention, as figure 1 As shown, the circuit includes:

[0055] The charging module 10, the input end of the charging module 10 is connected to the AC power supply, the output ...

Embodiment 2

[0059] This embodiment provides another bus capacitor pre-charging circuit, figure 2 It is a structural diagram of the bus capacitor pre-charging circuit according to the second embodiment of the present invention. In order to realize the charging of the DC bus capacitor while realizing the rectification of the three-phase AC, as figure 2 As shown, the charging module includes three charging units arranged in parallel: the first charging unit 101, the second charging unit 102 and the third charging unit 103, the above-mentioned first charging unit 101, the second charging unit 102 and the third charging unit The unit 103 is sequentially connected to the first phase line, the second phase line and the third phase line of the AC power supply, and the three-phase AC rectification is realized through the first charging unit 101, the second charging unit 102 and the third charging unit 103. Rectify, output a variable current, and charge the bus capacitor through the variable curr...

Embodiment 3

[0061] This embodiment provides another bus capacitor pre-charging circuit, image 3 It is a structural diagram of a bus capacitor pre-charging circuit according to the third embodiment of the present invention, as image 3 As shown, in the first charging unit 101, the second charging unit 102 and the third charging unit 103, each charging unit includes thyristors and diodes connected in series in the same direction, and the first phase line of the AC power supply AC is connected to the first charging unit 101 between the thyristor T1 and the diode D1; the second phase line of the AC power supply AC is connected between the thyristor T2 and the diode D2 in the second charging unit 102; the third phase line of the AC power supply AC is connected to the third charging unit 103 between thyristor T3 and diode D3. The output terminal of the controller 20 is respectively connected to the control terminal of the thyristor T1, the control terminal of the thyristor T2 and the control ...

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Abstract

The invention discloses a bus capacitor pre-charging circuit and method, a frequency converter and air conditioning equipment. The circuit comprises a charging module and a controller, wherein the input end of the charging module is connected with an alternating-current power supply, the output end is connected with a direct-current bus, and the charging module is used for outputting changed current; the input end of the controller is connected with a direct-current bus, the output end of the controller is connected with the charging module, and the controller is used for adjusting current output by the charging module according to the voltage of the direct-current bus. According to the invention, the charging current can be flexibly adjusted, the situation that a cement resistor is burntdown due to overlarge current caused by the fact that direct-current voltage is completely applied to the two ends of the cement resistor at the power-on moment is avoided, and the safety is improved.

Description

technical field [0001] The invention relates to the technical field of electronic power, in particular to a bus capacitor precharging circuit, method, frequency converter and air conditioning equipment. Background technique [0002] The traditional air conditioner pre-charging circuit is composed of a relay in the main circuit and a cement resistor connected in parallel. When the frequency converter is powered on, the relay is disconnected, the three-phase AC input is rectified by the rectifier module, and then the capacitor is charged through the cement resistance. When the bus voltage reaches the set value, the control relay is closed to short-circuit the cement resistance, thus completing Capacitor precharge. In addition to the relatively low charging efficiency and cumbersome operation of this method, more importantly, the moment the charging starts, the current is large, which may damage the cement resistor and affect the safe operation of the inverter. [0003] Aimin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32H02M7/155H02J7/34
CPCH02J7/345H02M1/32H02M7/1557
Inventor 熊建国章童刘文斌李洋范晓坤陈国明
Owner GREE ELECTRIC APPLIANCES INC
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