Control circuit capable of preventing supervoltage and preventing surge voltage

Abstract

The invention discloses a control circuit capable of preventing supervoltage and preventing surge voltage. In the invention, the control of output voltage is achieved through controlling opening / closing of a field-effect tube; when the output voltage is higher than the upper limit of a set voltage, the grid potential of the field-effect tube is drawn down, the field-effect tube is in a closed state, and at the moment, load consumes charges stored in a capacitor; and when the output voltage is lower than the lower limit of the set voltage, the grid potential of the field-effect tube is drawn up, the field-effect tube is in a conducting state, and at the moment, current input through the field-effect tube supplies power for the load and charges the capacitor. The invention can prevent the load from being damaged by continuous high voltage and surge from, and simultaneously, continuous power supply of the load can be ensured through the capacitor when the field-effect tube is closed. At the same time, the invention can regulate a circuit according to the rated voltage of the load, so that the output voltage is matched with the rated voltage of the load to be applicable to the load with different rated voltages.

Description

technical field [0001] The invention relates to an anti-overvoltage and anti-surge voltage control circuit, which belongs to the field of electronic technology. Background technique [0002] At present, the power supply of electronic equipment on cars and ships is provided by the power supply system on cars and ships. However, there are surge voltages in the power supply system of automobiles and ships, and sometimes the voltage is unstable. At present, the method of stabilizing the voltage usually used by electrical equipment is to use a regulator tube to limit the voltage at both ends of the load to a certain upper limit range, but if the power supply system provides a high voltage that lasts for a long time, it is very difficult It is easy to damage the power supply system of electrical equipment, resulting in equipment failure. Therefore, it is still difficult to realize the prevention of overpressure and anti-surge while ensuring the normal operation of the equipment....

AI Technical Summary

Problems solved by technology

However, there are surge voltages in the power supply system of automobiles and ships, and sometimes the voltage is unstable

At present, the method of stabilizing the voltage usually used by electrical equipment is to use a voltage regulator tube to limit the voltage at both ends of the load to a certain upper limit, but if the power supply system provides a high voltage that lasts for a long time, it is very difficult It is easy to damage the power supply system of electrical equipment, resulting in equipment failure

Therefore, it is still difficult to prevent overpressure and surge and ensure the normal operation of the equipment.

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