IPM protection device, motor and IPM protection method thereof

Abstract

The invention discloses an IPM protection device, an electric motor and an IPM protection method thereof. The device comprises a current sampling circuit, a first overcurrent protection circuit, a second overcurrent protection circuit and a controller, wherein, the current sampling circuit is used for collecting the three-phase current of the motor driven by the IPM to be protected, and outputtinga first output signal under the normal condition of the current sampling circuit, or outputting a second output signal under the abnormal condition of the current sampling circuit. The first overcurrent protection circuit is used for realizing overcurrent protection of IPM to be protected according to the first output signal under the control of the controller. The second overcurrent protection circuit is configured to realize overcurrent protection of the IPM to be protected according to the second output signal under the control of the controller. The scheme of the invention can solve the problem that the IPM internal power device is burned out after the operational amplifier chip fails in the current sampling circuit, and the protection reliability is poor, so that the effect of improving the protection reliability is achieved.

Description

technical field [0001] The invention belongs to the technical field of motor protection, in particular to an IPM protection device, a motor and an IPM protection method thereof, in particular to a protection circuit for failure of an IPM current sampling operational amplifier (that is, a protection circuit for failure of a motor three-phase current sampling operational amplifier) , a motor with the circuit, and a protection method for the failure of the IPM current sampling operational amplifier of the motor. Background technique [0002] For a motor driven by an Intelligent Power Module (IPM), its three-phase current is sampled through a resistor and detected through signal amplification. If the op amp chip of the current sampling circuit fails, the MCU cannot obtain the real-time value of the three-phase current of the motor, judges that the motor current is too low, turns on the normal drive logic of the motor, and continuously increases the duty cycle of the PWM, resulti...

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Problems solved by technology

[0003] The object of the present invention is to provide an IPM protection device, a motor and an IPM protection method thereof in view of the above defects, so as to solve the problem in the prior art that the internal power device of the IPM is burned after the operational amplifier chip fails in the current sampling circuit and the protection reliability is poor. problems, to achieve the effect of improving the reliability of protection

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