An overheating protection device, a motor and an overheating protection method thereof

Abstract

The invention discloses an overheat protection device, a motor and an overheat protection method thereof. The device comprises a temperature monitoring unit, a heat conduction medium unit and a control unit. The temperature monitoring unit is connected to a power device of a motor to be protected through the heat conductive medium unit; the temperature monitoring unit is configured to monitor andobtain the current temperature of the power device through the temperature of the power device transmitted by the heat conductive medium unit; the control unit is configured to issue a trigger signalfor turning off the power device when the current temperature reaches the set protection temperature, so that the controller of the motor to be protected turns off the power device based on the trigger signal. The scheme of the invention can solve the problem of poor monitoring accuracy of placing a thermistor near the MOS for monitoring the MOS temperature, and achieves the effect of improving the detection accuracy.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, and in particular relates to an overheat protection device, a motor and an overheat protection method thereof, and in particular to a device for accurately monitoring MOS temperature, a motor with the device, and an overheat protection method for the motor. Background technique [0002] For low-voltage brushless DC motors, the selection of power devices is usually dominated by discrete MOS, which is widely used due to its fast switching response speed, low switching loss, and low on-resistance. [0003] Because it is used in low-voltage and high-current applications, the heat generation of MOS will be more serious. If the temperature is too high, the current that can be passed is small and the loss will be large. In severe cases, it will burn out (ie, the MOS tube). Therefore, the temperature of the MOS needs to be monitored during use, and when the temperature reaches a certain value...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide an overheating protection device, a motor and an overheating protection method thereof in view of the above-mentioned defects, so as to solve the problem in the prior art that the thermistor is placed near the MOS to monitor the MOS temperature and the monitoring accuracy is poor, so as to improve the The effect of monitoring accuracy

Images