Charge bleed-off method, bleeder circuit and converter
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A bleeder circuit and inverter technology, applied in the field of inverters, can solve problems such as hidden safety hazards, energy waste, energy consumption and the like
Inactive Publication Date: 2016-08-31
GREE ELECTRIC APPLIANCES INC
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Problems solved by technology
[0003] When the converter is working, a relatively high voltage is established on the DC bus 3. When the converter stops, the residual charge on the DC bus 3 needs to be discharged through the discharge circuit, otherwise there will be safety hazards
The currently used solution is to directly connect the bleeder resistor 5 at both ends of the DC bus 3 to realize this function. No matter in what state, as long as there is voltage on the DC bus 3, energy will be consumed on the bleeder resistor 5, resulting in energy waste , and the heating of the resistor will increase the internal temperature of the converter
Method used
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no. 1 Embodiment
[0060] In the first specific embodiment of the present invention, the contactor may specifically be a DC contactor. The bleeder circuit may also include a controller where:
[0061] The DC contactor coil is connected with the controller, and the DC contactor coil is powered by the controller.
[0062] When the inverter system is powered on, the controller is powered on first, and then the coil of the DC contactor is powered on through the switch output, so that the normally closed contact of the DC contactor is disconnected, and the discharge circuit is cut off.
[0063] When the converter system is powered off, the controller is powered off and stops working, and the coil of the DC contactor is powered off, so that the normally closed contacts of the contactor are closed, and the discharge circuit is connected to discharge the residual charge of the DC bus.
no. 2 Embodiment
[0065] In the second specific embodiment of the present invention, the contactor may specifically be an AC contactor, and the coil of the contactor is powered by alternating current.
[0066] The power-on and power-off sequence of the AC contactor coil is consistent with the power-on and power-off sequence of the converter.
[0067] The AC contactor coil and the inverter system can be powered by the same AC power source.
[0068] When the converter system is powered on, the coil of the DC contactor is energized, so that the normally closed contacts of the DC contactor are disconnected, and the residual charge discharge circuit of the DC bus is disconnected.
[0069] When the converter system is powered off, the coil of the DC contactor is powered off, so that the normally closed contact of the DC contactor is closed, connected to the DC bus residual charge discharge circuit, and the DC bus residual charge is discharged.
[0070] In the first specific embodiment of the present...
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Abstract
The invention discloses a charge bleed-off method, a bleeder circuit and a converter. The bleeder circuit disclosed by the invention includes a bleed resistor and a control switch connected with the bleed resistor in series, wherein the bleeder circuit is connected with a bus capacitor of the converter in parallel; and the bleed resistor and the control switch are connected between an anode and a cathode of a DC bus of the converter. According to the invention, a bleed-off function of residual charges of a voltage on the DC bus can be controlled in the case of shutdown of the converter: the bleeder circuit is not accessed when the converter works normally; and the bleeder circuit is automatically accessed when the converter is shut down to bleed off the residual charges on the DC bus in time. When the converter works normally, the bleeder circuit is cut off, and the bleed resistor generates no heat. Accordingly, by adopting the embodiment of the invention, unnecessary losses are reduced on one hand, and on the other hand, the internal temperature of the converter will not rise, so that the reliability of the system is improved.
Description
technical field [0001] The invention relates to the field of converters, in particular to a charge discharge method, a discharge circuit and a converter. Background technique [0002] The main topology of the converter used in the existing high-power frequency conversion centrifuge unit usually adopts the "AC-DC-AC" structure. figure 1 It is the main structure diagram of the current converter used in the existing high-power frequency conversion centrifuge unit. Such as figure 1 As shown, the rectification module 1 and the inverter module 2 of the converter are connected through a DC bus 3 . For AC input, a DC potential is established through the rectifier module 1, and a relatively large bus capacitor 4 is connected to the intermediate link, that is, the DC bus 3 for energy storage. [0003] When the converter is working, a relatively high voltage is established on the DC bus 3 , and when the converter stops, the residual charge on the DC bus 3 needs to be discharged thro...
Claims
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Application Information
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