DC motor stall protection circuit and search light

Abstract

The invention relates to a direct-current motor stalling protection circuit including a sampling comparison module, a sampling resistor, a relay, a relay driving module and a voltage stabilization source; a sampling input end of the sampling comparison module is used for connecting the negative pole of the direct-current motor and the sampling input end is in ground connection through the sampling resistor; the voltage stabilization source is connected with an reference input end of the sampling comparison module for providing a reference voltage for the sampling comparison module; an output end of the sampling comparison module is connected with the relay driving module for outputting a control signal when a voltage of the sampling input end is higher than a stalling voltage so that the relay driving module is controlled to drive the relay to disconnect the positive pole of the direct-current motor and an power input interface; and when the relay driving module does not receive the control signal, the relay is in a state of connecting the power input interface and the positive pole of the direct-current motor. The invention also relates to the search light. Compared with the traditional technology of using fuses, the direct-current motor stalling protection circuit is higher in sensitivity and is less likely to be affected by environment temperatures.

Description

technical field [0001] The present invention relates to a protection circuit, in particular to a DC motor stall protection circuit, and also to a search light equipped with the DC motor stall protection circuit. Background technique [0002] During the working process of the motor, for example, in the process of driving the search light to rotate, the motor may be blocked due to obstacles encountered during the rotation of the search light. At this time, it is generally necessary to stop the power supply to the motor, otherwise it will cause damage to the motor. [0003] A traditional solution is to connect a self-recovery fuse in series between the motor and the power supply. When the motor is locked, the current of the motor increases, and the self-recovery fuse is disconnected due to overheating. However, this kind of circuit has low sensitivity and is greatly affected by the ambient temperature, so sometimes the circuit cannot be disconnected in time when the rotor is l...

AI Technical Summary

Problems solved by technology

[0004] Based on this, it is necessary to provide a high-sensitivity DC motor stall protection circuit for the problem of low sensitivity of the traditional motor stall circuit

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