Over-voltage absorbing protective circuit capable of accurately presetting protection value

Abstract

The invention discloses an over-voltage absorbing protective circuit capable of accurately presetting a protection value. The over-voltage absorbing protective circuit capable of accurately presetting the protection value is composed of an absorbing element protection unit, a reference voltage, a comparator, an electric control switch, a capacitor and three resistors. According to the over-voltage absorbing protective circuit capable of accurately presetting the protection value, an absorbing protection element can be connected to a two-port network where a spike voltage is located at the moment that a voltage spike exceeds a preset safety voltage, the energy of the spike is absorbed, and the spike voltage value is limited, so that the element in the circuit is protected; when the spike voltage at the two ends of the two-port network reduces to a considered safe value, the absorbing protection element is rapidly disconnected with the circuit, so that normal operation of the circuit is not influenced by the absorbing protection element.

Description

technical field [0001] The invention relates to the field of voltage protection, in particular to an overvoltage absorbing protection circuit capable of accurately preset protection values. Background technique [0002] Components in power conversion equipment (such as switching power supplies, inverters, etc.) often face high-voltage spikes. In order to prevent components from being damaged during work, it is usually necessary to design over-voltage protection at locations prone to high-voltage spikes. voltage protection circuit. Traditional high-voltage spike protection circuits are usually composed of passive components such as MOVs, TVS tubes, and gas discharge tubes. These components can often absorb large amounts of energy, but due to the limitations of component materials and manufacturing processes, component parameters often have large errors. Therefore, it is impossible to accurately grasp the voltage value of the component for overvoltage protection in designing ...

AI Technical Summary

Problems solved by technology

Traditional high-voltage spike protection circuits are usually composed of passive components such as MOVs, TVS tubes, and gas discharge tubes. These components can often absorb large amounts of energy, but due to the limitations of component materials and manufacturing processes, component parameters often have large errors. Therefore, in the design of the circuit, it is impossible to accurately grasp the voltage value of the component for overvoltage protection.

The deviation between the actual circuit overvoltage protection value and the preset protection value is large

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