Low-voltage starting circuit capable of being started at high voltage and working in a wide range

Abstract

The invention provides a low-voltage starting circuit capable of being started at high voltage and working in a wide range, comprising a first N switching transistor and a second P switching transistor which are used for switching different polarities and conducting. The connection pin of the first N switching transistor and the connection pin of the second P switching transistor are different from each other and are connected to the input end and the output end of a power supply; the base pole of the first N switching transistor is coupled with the node of a voltage stabilizing circuit, and the base pole of the second P switching transistor is coupled with the node of a switching controlling unit; and the switching controlling unit comprises a voltage dividing circuit, a compound stage switching controlling circuit and a voltage hysteresis circuit. Therefore, the structure of the low-voltage starting circuit is effectively simplified, the volume is reduced, the cost is lowered and the high-voltage bearing capacity is greatly improved. In addition, the low-voltage starting circuit can work in a wider range, can be started at both low voltage and high voltage and can still supply power stably when the high voltage critical value and the low voltage critical of the voltage hysteresis circuit are switched frequently.

Description

Technical field [0001] The present invention relates to a low-voltage starting circuit, in particular to a low-voltage starting circuit that can withstand high-voltage sharing in a wide range, which can effectively simplify the circuit, reduce the size, and reduce the cost, so that the ability to withstand high-voltage is greatly improved, and the working range is increased while including Cover low voltage and higher high voltage can be started, and through the voltage hysteresis circuit, the effect of stable power supply can still be maintained when the high and low voltage are frequently changed. Background technique [0002] The power supply circuit is the main power required in various electronic products. An electronic product with excellent computing and functions, if it is missing, it will be like scrap iron, and it will not work normally. The traditional power supply circuit Although the technology is mature, if you want to achieve a fairly stable power supply effect, ma...

AI Technical Summary

Problems solved by technology

[0002] The power supply circuit is the main power 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. The traditional power supply circuit Although the technology is mature, many parts must be added inside if a stable power supply is to be achieved. As a result, the manufacturing cost will increase significantly, and the volume will be too large to occupy space, which is not in line with the increasingly streamlined electronic products. Narrow down the needs on the development trend

[0003] The existing power supply circuit not only has many internal parts, but also can only work within a certain range of voltage, and cannot be applied to low voltage and high voltage at the same time. Wide range, can cover the advantages of low voltage and high voltage sharing at the same time, and the circuit composition is simplified and there are few components, so the manufacturing cost is low and the volume is small without occupying space. It is quite practical and convenient, and can be widely used in various electronic products.

[0004] like figure 1 As shown, although the overall planning and design are good, there is still a small defect in the operation of the M3 and M4 transistors of this low-voltage starting circuit technology at high voltages, which will eventually be limited by the collapse of the base, which will reduce the withstand capacity of high voltages. However, it cannot operate at a higher operating voltage, and its circuit composition also requires some high-voltage-resistant special components to widen the allowable range of its operating voltage. All these functions have not been perfected, and there are still room for improvement

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