Low-voltage starting circuit capable of bearing high voltage and having reverse-phase protection function

Abstract

The invention relates to a low-voltage starting circuit capable of bearing a high voltage and having a reverse-phase protection function. The low-voltage starting circuit mainly comprises a first switch transistor and a second switch transistor which have different NP polarities and are alternatively turned on, wherein switch pins of the first switch transistor and the second switch transistor are different from each other and are connected to a power supply input end and a power supply output end; a grid of the first switch transistor is coupled on a node of a voltage-stabilizing circuit; a grid of the second switch transistor is connected on a node of a switch control unit; and the switch control unit comprises a voltage division circuit, a multi-stage switch control circuit, a voltage hysteresis circuit and a working mode, in which an output voltage is acquired by the power supply output end corresponding to an input voltage of the power supply input end through the circuit. Therefore, the working range can be enlarged by using an effectively simplified circuit and the reverse-phase protection function is achieved. Simultaneously, the low-voltage starting circuit can be started at a low voltage or the high voltage, and stable power supply effect can be kept when the voltage hysteresis circuit is in a critical state of high and low-voltage frequent variations.

Description

technical field [0001] The invention relates to a low-voltage starting circuit, in particular to a low-voltage starting circuit capable of withstanding high voltage and having reverse-phase protection function. Background technique [0002] The power supply circuit is the main driving force required in various electronic products. An electronic product with excellent computing power and functions will be like scrap iron without this part, and it will not work normally. Although the traditional power supply circuit is technically It is mature, but it can only work within a certain range of voltage, and cannot be used for simultaneous operation of low voltage and high voltage. If you want to obtain a larger working range or have a more stable power supply, you must add many parts inside, so Firstly, the manufacturing cost will increase significantly, and the volume will be too large to occupy space, which does not meet the needs of the development trend of electronic products ...

AI Technical Summary

Problems solved by technology

[0002] The power supply circuit is the main driving force required in various electronic products. An electronic product with excellent computing power and functions will be like scrap iron without this part, and it will not work normally. Although the traditional power supply circuit is technically It is mature, but it can only work within a certain range of voltage, and cannot be used for simultaneous operation of low voltage and high voltage. If you want to obtain a larger working range or have a more stable power supply, you must add many parts inside, so First, the manufacturing cost will increase significantly, and the volume will be too large to occupy space, which does not meet the needs of the development trend of electronic products becoming more and more streamlined and smaller.

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