FET voltage regulator low-voltage start-up circuit

Abstract

A low-voltage starting circuit for a field effect tube voltage regulator, including a sampling control circuit and a field effect tube switch circuit, connected between the positive pole and the negative pole of the regulator, the output terminal of the sampling control circuit, and the input terminal of the field effect tube switch circuit. The special feature of the energy storage circuit is that the positive electrode of the regulator is connected to the energy storage capacitor in the fast energy storage circuit through the base-collector of the power supply triode, the power supply plus the current-limiting charging resistor, and the fast energy storage circuit is connected to the field effect tube switch The regulator tube at the input end of the circuit is grounded through the collector and emitter of the anti-leakage triode, and the base of the anti-leakage triode is controlled by the voltage divider circuit in the fast energy storage circuit. The advantages are: it can prolong the power supply maintenance time of the accumulator, and realize the three-wire single-function voltage regulator made of field effect tubes in low-voltage power supply (0.5-1.0V), low speed (generator speed is less than 1000 rpm), small Under conditions such as starting current (150-300 mA), the car generator can normally enter the power generation state when starting.

Description

technical field [0001] The invention relates to a low-voltage start-up circuit for a field-effect tube type automobile generator voltage regulator, in particular to a low-voltage start-up circuit that can satisfy the low-voltage start-up effect of an automobile generator under various conditions and ensure that the automobile generator can enter the best work under any circumstances. State of the FET voltage regulator low voltage start-up circuit. Background technique [0002] In the field of automobiles, the most commonly used generators are nine-tube rectifier or eleven-tube rectifier generators. The characteristic of this generator is that the magnetic field current is provided by three small rectifier tubes separately. The potential light is off. During startup, when the charging indicator light is on, the positive pole D of the generator voltage regulator is + With a low potential of less than 1V (called low-voltage start), the regulators used with this type of generat...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of the short energy storage time of the accumulator, and provide a field effect tube voltage regulator that can prolong the power supply maintenance time of the accumulator, so that the automobile generator can normally enter the power generation state when it is started under any conditions. low voltage start-up circuit

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