There is provided a motor drive circuit including: a motor bridge having a bridge arm for a motor phase, the bridge arm including upper and lower switches; a solid-state phase isolation relay SSPIR disposed in series in an electrical path connecting the motor to a corresponding leg; and a monitoring device for monitoring the current waveform in the phase to identify when the current is within a safe operating region in which breaking the SSPIR is safe, the safe operating region comprising a period of time, wherein the current flowing in the phase of the motor is in the opposite direction to the body diode of the SSPIR and the magnitude of the current is below a safety threshold level; and a control circuit, in which the motor drive circuit is arranged such that the SSPIR is turned off only when the current is in the safe operating region, and the SSPIR is not turned off when the current flowing in the phase flows in the phase of the motor in the opposite direction to the body diode of the SSPIR and the magnitude of the current is above a safe threshold level.
提供一种马达驱动电路,包括:马达桥,马达桥对于马达相具有桥臂,桥臂包括上部和下部开关;固态相隔离继电器SSPIR,其被串联设置在将马达的相连接到相应的桥臂的电路径中;和监测装置,用于监测相中的电流波形以识别电流何时处于安全操作区域内,在安全操作区域中断开SSPIR是安全的,安全操作区域包括如下的一时间段,其中在马达的相中流动的电流在与SSPIR的体二极管相反的方向上并且电流的幅度低于安全阈值水平;以及控制电路,其中马达驱动电路被布置为使得:仅在电流处于安全操作区域时SSPIR断开,并且当在相中流动的电流在马达的相中在与SSPIR的体二极管相反的方向上流动且电流的幅度高于安全阈值水平时SSPIR不断开。
Motor drive circuit
马达驱动电路
2024-07-12
Patent
Electronic Resource
Chinese
IPC: | H02P CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS , Steuern oder Regeln von elektrischen Motoren, elektrischen Generatoren, dynamoelektrischen Umformern / B62D MOTOR VEHICLES , Motorfahrzeuge / H02H EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS , Schutzschaltungsanordnungen |
Motor drive control circuit and motor drive control method
European Patent Office | 2021
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