Overheat and overcurrent protection device, motor and overheat and overcurrent protection method thereof

Abstract

The invention discloses an overheat and overcurrent protection device, a motor and an overheat and overcurrent protection method thereof. The device comprises a temperature detection unit (10) for detecting the current temperature of an electronic commutation control circuit of a motor to be protected; a biasing unit (20) for converting the current of the motor to be protected at the current temperature into a current overheat feedback voltage of the motor to be protected and transmitting the overheat feedback voltage to a non-inverting input terminal of a comparator (30); and a comparator (30) for outputting a first reverse level signal to a power module of a motor to be protected in a case where the current overheat feedback voltage is greater than a set reference voltage to start an overheat protection mode of the motor to be protected. The scheme of the invention can solve the problem of low reliability of overheat protection caused by slow overheat protection reaction of the chipin the electronic commutation control circuit of the motor, and achieve the effect of improving the reliability of overheat protection.

Description

technical field [0001] The invention belongs to the technical field of motors, and in particular relates to an overheating and overcurrent protection device, a motor and an overheating and overcurrent protection method thereof, in particular to a DC motor overheating and overcurrent detection and its protection circuit, a motor with the circuit, and the motor Overheating and overcurrent detection and its protection method. Background technique [0002] The application of brushless DC motors is increasingly widespread, and it has expanded from the initial application fields of aviation and military facilities to industrial and civil fields. The use of brushless motors in household appliances such as air conditioners, refrigerators, fans, washing machines, etc. has become very common. [0003] Due to the wide range of applications of brushless DC motors, the requirements for their operating performance are different in different applications, so there are various types of bru...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to, aiming at the above-mentioned defects, provide an overheating and overcurrent protection device, a motor and an overheating and overcurrent protection method thereof, so as to solve the problem caused by the slow response of the chip itself in the electronic commutation control circuit of the motor in the prior art. The problem of low reliability of overheating protection can achieve the effect of improving the reliability of overheating protection

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