Peak voltage protection circuit

Abstract

The invention provides a peak voltage protection circuit and belongs to the technical field of power supply circuits. The peak voltage protection circuit solves the problem that the existing power supply voltage may damage a load when abnormal (too high). The peak voltage protection circuit includes a power supply protection circuit, a thermistor PR1, a voltage-dividing sampling circuit, a comparator circuit, a filter capacitor C1, and a relay control circuit including a relay K. The relay K includes an execution switch S. The thermistor PR1 and the execution switch S are connected in parallel. The output end of the thermistor PR1 is connected with a load RT. The other end of the load RT is grounded. One end of the filter capacitor C1 and the thermistor PR1 are connected with the output end of the execution switch S. The other end of the filter capacitor C1 is grounded. The voltage-dividing sampling circuit generates the reference voltage and the acquisition voltage and outputs the reference voltage and the acquisition voltage to the non-inverting input end and the inverting input end of a comparator in the comparator circuit. The relay control circuit switches on or off the execution switch S according to a control signal. The peak voltage protection circuit has the advantage of preventing the abnormal power supply voltage from damaging the load.

Description

technical field [0001] The invention belongs to the technical field of power supply circuits and relates to a peak voltage protection circuit. Background technique [0002] Solar water pump is a device that converts solar energy into electrical energy, and then converts electrical energy into mechanical energy to pump water. It is used for agricultural and forestry irrigation, household water pumping, or other industrial and agricultural needs to raise low water levels to high water levels or low water levels. Change the pressure to a place with high water pressure. [0003] The power source of the water pump adopts clean energy—solar energy, and the brushless DC motor drives the water pump to work. When the wrong power supply is plugged in or the voltage of the solar power is abnormal during the operation process, the input to the brushless DC motor may occur. The voltage is much higher than the rated voltage of the brushless DC motor, which will cause the motor driver to ...

AI Technical Summary

Problems solved by technology

[0003] The power source of the water pump adopts clean energy—solar energy, and the brushless DC motor drives the water pump to work. When the wrong power supply is plugged in or the voltage of the solar power is abnormal during the operation process, the input to the brushless DC motor may occur. The voltage is much higher than the rated voltage of the brushless DC motor, which will cause the motor driver to burn out immediately

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