Alternating-direct-current power source voltage stabilization protective circuit

Abstract

The invention discloses an alternating-direct-current power source voltage stabilization protective circuit which comprises a dual-direction silicon controlled rectifier which is in series connection between two input ends of an alternating-direct current and a series branch. A first resistor, a dual-direction breakdown diode or two voltage stabilization diodes which are in series-opposing connection, and a silicon controlled rectifier protective element are sequentially connected to form the series branch, and the series branch can be in parallel connection with the dual-direction silicon controlled rectifier. According to the voltage stabilization protective circuit, when loads of a power source get larger or smaller, power supply loads of the power source can be automatically adjusted, and the protective circuit is suitable for the alternating-current input or the direct-current input, and also supports high-power non-instantaneous surge impact protection. The protective input range is quite wide, the voltage stabilization protective circuit can conduct protection at the input high voltage below 780V, and be provided with a diode between the positive input end of the alternating-direct current and the input end of the power source, and therefore when the circuit works, electric energy stored in the power source is not extracted. In addition, the voltage stabilization protective circuit is simple, small in component, low in cost, high in efficiency and small in size.

Description

technical field [0001] The invention relates to the field of power supply, in particular to an AC and DC power supply voltage stabilization and protection circuit. Background technique [0002] Since the current load of the power supply is generally constant or does not change much, when the input power voltage fluctuates too much, the current flowing through the load point will greatly increase, resulting in damage to the load equipment or damage to the power supply. However, the current power supply voltage stabilization protection current cannot cope with this situation. Generally, it can only protect the instantaneous surge impact, or ensure the stable operation of the power supply within a small input range, and the current power supply voltage stabilization protection circuit is generally They all only protect the damage caused by the high amplitude of the DC power supply. Contents of the invention [0003] In order to solve the above technical problems, the technic...

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Problems solved by technology

[0002] Since the load of the current power supply is generally constant or does not change much, when the input power supply voltage fluctuates too much, the current flowing through the load point will greatly increase, resulting in damage to the load equipment or power supply.

However, the current power supply voltage stabilization protection current cannot cope with this situation. Generally, it can only protect the instantaneous surge impact, or ensure the stable operation of the power supply within a small input range, and the current power supply voltage stabilization protection circuit is generally They only protect the damage caused by the high amplitude of the DC power supply.

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