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Inverter Control Circuit

A control circuit and inverter technology, applied in the direction of control system, AC motor control, emergency protection circuit device, etc., can solve the problems that the operation cannot be restarted, increase the cost, etc.

Active Publication Date: 2018-11-09
HITACHI POWER SEMICON DEVICE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the inverter unit 19 is simply stopped, there is a problem that the abnormal voltage is maintained until the charge accumulated in the smoothing capacitor 16 is naturally discharged, and the operation of the inverter unit 19 cannot be restarted.
Therefore, it is also conceivable to provide a discharge circuit that discharges the charge accumulated in the smoothing capacitor 16 when an abnormal voltage is detected, but providing a separate discharge circuit increases the cost.

Method used

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Examples

Experimental program
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Effect test

no. 1 approach

[0021]

[0022] (the whole frame)

[0023] First, refer to figure 1 The shown block diagram illustrates the structure of the motor drive device according to the first embodiment of the present invention.

[0024] figure 1 , converter 4 converts AC voltage VS supplied from commercial power supply 2 into DC voltage VC. Inverter 4 can be configured by, for example, a full-wave rectification circuit in which four diodes are bridged when commercial power supply 2 is single-phase. Capacitor 6 is connected between the voltage output terminal of inverter 4 and a ground potential (hereinafter referred to as “GND potential”), and accumulates electric charges by DC voltage VC. In addition, the structure of the inverter 4 is not limited to the above, but it is preferable that the current does not flow back from the capacitor 6 to the inverter 4 . When converter 4 is constituted by a full-wave rectification circuit, in a steady state, DC voltage VC becomes almost equal to the peak va...

no. 2 approach

[0046] Next, refer to Figure 4 The block diagram shown is used to explain the structure of the motor drive device according to the second embodiment of the present invention.

[0047] In this embodiment, the application Figure 4 An inverter 130 is shown instead of the inverter 20 of the first embodiment. A control signal SD which is a binary signal is input to the inverter 130 . When control signal SD becomes H (high) level (a voltage equal to or greater than a predetermined threshold), inverter 130 enters an operating state, and outputs three-phase AC voltages MU, MV, MW to motor 30 . On the other hand, when control signal SD becomes L (low) level (a voltage lower than the aforementioned threshold value), inverter 130 enters a stop state and stops output of three-phase AC voltages MU, MV, and MW. In addition, the inverter 130 of the present embodiment also sets the three-phase AC voltages MU, MV, and MW based on the control command voltage VSP similarly to the inverter 2...

no. 3 approach

[0053] Next, refer to Figure 5 The configuration of the motor drive device according to the third embodiment of the present invention will be described with reference to the block diagram shown.

[0054] Instead of the control signal SD in the second embodiment, a negative logic control signal NSD is input to the inverter 140 of the present embodiment. That is, when control signal NSD becomes L level (a voltage lower than a predetermined threshold value), inverter 140 enters an operating state and outputs three-phase AC voltages MU, MV, and MW to motor 30 . On the other hand, when control signal NSD becomes H level (a voltage equal to or greater than the threshold value), inverter 140 enters a stop state, and stops output of three-phase AC voltages MU, MV, and MW. In addition, in this embodiment, the application Figure 5 A stop / resume control circuit 60 is shown instead of the stop / resume control circuit 50 of the second embodiment. The stop / resume control circuit 60 is c...

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PUM

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Abstract

The invention provides an inverter control circuit. In the inverter control circuit, the electric charge accumulated in the capacitor can be appropriately discharged, and the abnormal voltage detection means and the inverter stop / restoration means can be configured at low cost. Setting: An abnormal voltage detection and discharge circuit that outputs a detection signal (VA) corresponding to the above-mentioned DC voltage (VC) when the DC voltage output from the capacitor exceeds the predetermined normal range, that is, the breakdown voltage of the Zener diode. Discharging the above-mentioned capacitor (6), on the other hand, in the case where the above-mentioned DC voltage is included in the above-mentioned normal range, its impedance becomes higher compared with the case where the above-mentioned DC voltage (VC) exceeds the above-mentioned normal range; stop / resume control A circuit (40) that sets the inverter (20) in a stopped state based on the above detection signal (VA), the inverter converts the above DC voltage (VC) into AC voltages (MU, MV, MW) and supplies them to load(30).

Description

technical field [0001] The invention relates to an inverter control circuit. Background technique [0002] As the background technology of this technical field, in the abstract of the following patent document 1, it is described that "the current detection means of the phase current of one or more phases is arranged in the circuit of the air conditioner equipped with the DC voltage detection means 22 of the inverter part 19. 6. More than one pair of phase voltage detection units 7, a voltage phase calculation unit 9 based on its input, a transistor module 4 with a plurality of transistors and diodes built in, and a resistor for dividing the DC voltage rectified by the diodes therein device 15, its DC voltage detection unit 12, an abnormal voltage monitoring unit 13 connected to the DC voltage detection unit 12, a transistor control unit 11, an arithmetic device 10 for determining the control method of the transistor module 4, and a smoothing capacitor connected to the DC vol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/122H02M1/32G01R19/165
CPCG01R19/16523H02H7/1222H02M1/32H02H7/122H02P27/06H02M1/322
Inventor 前田大辅樱井健司内海智之佐佐木绅也
Owner HITACHI POWER SEMICON DEVICE