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Discharge control circuit and power conversion device

A discharge control and discharge circuit technology, applied in the direction of output power conversion device, motor control, AC motor control, etc., can solve the problem of discharge resistance damage and achieve the effect of improving maintainability

Pending Publication Date: 2022-04-01
HITACHI ASTEMO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the discharge control is executed, if the battery contactor is closed for some reason, an excessive current flows through the discharge resistor for a long time, and the discharge resistor may be damaged by heat.

Method used

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  • Discharge control circuit and power conversion device
  • Discharge control circuit and power conversion device
  • Discharge control circuit and power conversion device

Examples

Experimental program
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Embodiment Construction

[0032] Hereinafter, embodiments of the power conversion device of the present invention will be described with reference to the drawings. In addition, in each figure, the same code|symbol is attached|subjected to the same element, and overlapping description is abbreviate|omitted.

[0033] figure 1 It is a schematic configuration diagram of the power conversion device 101 according to the embodiment of the present invention. The power conversion device 101 includes a main control unit (CPU) 102, a first switching element 110 controlled by the main control unit 102, a sub-control unit (sub-CPU) 103, a second switching element 107 controlled by the sub-control unit 103, an accumulated electric charge The capacitor 109 and the discharge resistor 108 that consume the charge. Power conversion device 101 receives DC power supplied from battery 105 via contactor 106 and outputs AC power for driving motor 104 .

[0034] figure 2 yes figure 1 The shown configuration example of th...

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PUM

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Abstract

The present invention addresses the problem of providing a power conversion device capable of specifying a fault location of an inverter in detail in the case of an active discharge failure. A calculation circuit (102) that outputs a discharge instruction for controlling a discharge operation on the basis of the voltage across the discharge circuit; and an output circuit (203) that outputs a drive signal on the basis of the control signal, the arithmetic circuit (102) monitors the amount of decrease in the voltage across the discharge circuit, the output of the arithmetic circuit (102), i.e., an LV read back signal, and the output of the output circuit (203), i.e., an HV read back signal, and specifies a fault location.

Description

technical field [0001] The invention relates to a fast active discharge control circuit for a high-voltage capacitor in a power conversion device of a hybrid vehicle, an electric vehicle, etc., and in particular to a method for diagnosing a fault location of the discharge control circuit. Background technique [0002] In a system that drives a motor from a high-voltage battery such as a hybrid car or an electric car, it is required to quickly separate the inverter from the high-voltage battery, or to quickly discharge the residual charge inside the inverter. For example, in the U.S. regulation FMVSS 305 (prevention of electrolyte outflow and electric shock in electric vehicles), within 5 seconds of stopping the vehicle due to a collision, etc., in order to keep the output voltage of the inverter below the specified voltage, it is necessary to make the input stage The residual charge of the connected smoothing capacitor is quickly discharged to the specified value. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P29/024H02P27/06
CPCY02T10/70H02M1/322Y02T10/72H02M7/537H02H9/041H02H3/202
Inventor 村山规雄吉田毅西田茂浩野村逸郎
Owner HITACHI ASTEMO LTD