AC (Alternating Current)-DC (Direct Current) linear voltage stabilizing circuit

Abstract

The invention discloses an AC (Alternating Current)-DC (Direct Current) linear voltage stabilizing circuit. The AC-DC linear voltage stabilizing circuit comprises a charging circuit, an energy-storagecapacitor, a linear voltage stabilizing circuit body, a starting circuit and an active bleeder circuit, wherein the charging circuit is used for receiving rectified voltage and supplying power; the energy-storage capacitor is used for receiving charging voltage and charging; the linear voltage stabilizing circuit body is used for outputting linear stabilized voltage for processing; the starting circuit is used for starting power supply for the energy-storage capacitor; the active bleeder circuit is used for carrying out zero clearing bleeder of parasitic capacitance on the rectified voltage.The linear voltage stabilizing circuit further comprises an output programmable circuit; output of three different direct current voltages is realized by three different states of floating of one pinof a chip, short circuit grounding or grounding of one external resistor. According to the AC-DC linear voltage stabilizing circuit, the active bleeder circuit is added into the charging circuit, so that the influence from parasitic parameters in the circuit can be effectively eliminated and normal work of a system is ensured. Meanwhile, system loss can be reduced and the conversion efficiency isimproved.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to an AC-to-DC linear voltage regulator circuit. Background technique [0002] Power converters are essential components in electronic systems. As we all know, power converters include two main types: linear converters and switching power converters, and can be divided into two types: isolated and non-isolated in terms of conversion methods. Switching power converters can achieve high conversion efficiency, so they are widely used in medium to high power applications. In low power applications, especially systems below a few watts, linear converters are the mainstay. One of the important factors is linear conversion. Converters start to be lower in system cost than switching converters. [0003] At present, the non-inductor AC-to-DC linear voltage regulation schemes that are applied to very small power applications and have high efficiency mainly use chopper power supp...

AI Technical Summary

Problems solved by technology

[0004] Based on this, it is necessary to provide an AC-to-DC linear voltage regulator circuit for the problem that the current non-inductor AC-to-DC linear voltage regulator scheme will be affected by parasitic parameters in the circuit, resulting in the system not working properly.

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