Offset current regulation circuit based integrated voltage-stabilizing constant-current power supply

Abstract

The invention discloses an offset current regulation circuit based integrated voltage-stabilizing constant-current power supply. The integrated voltage-stabilizing constant-current power supply is characterized by mainly comprising a control chip U3, a transformer T, a diode rectifier U1, a polar capacitor C1, a triode VT1, a diode D2, a polar capacitor C4, an integrated voltage-stabilizing circuit, a reference voltage output circuit, and an offset current regulation circuit, wherein the integrated voltage-stabilizing circuit is connected between the diode rectifier U1 and the emitting electrode of the triode VT1 in series; the reference voltage output circuit is connected with the collector electrode of the triode VT1 and the control chip U3 separately; and the offset current regulation circuit is connected between the OUT pin of the control chip U3 and the reference voltage output circuit in series. By adoption of the integrated voltage-stabilizing constant-current power supply, the voltage and current power consumption of the power supply can be effectively lowered, and ripple wave in the current can be effectively eliminated so as to ensure that the integrated voltage-stabilizing constant-current power supply can output stable voltage and current; and in addition, nonlinear distortion of the triangular wave voltage can be effectively prevented.

Description

technical field [0001] The invention relates to the field of electronics, in particular to an integrated voltage-stabilizing constant-current power supply based on an offset current adjustment circuit. Background technique [0002] With the continuous development of science and technology, a large number of electronic products such as TVs and computers have appeared in people's lives. Triangular wave scanning circuits are used in TV screens, computer monitors and other display devices. However, the current general triangular wave system uses an analog circuit to charge a capacitor through a constant current power supply to generate a linear triangular wave voltage. However, the existing constant current power supply has the problem of unstable output voltage and current, which causes different degrees of nonlinear distortion at the beginning and end of the triangular wave voltage. [0003] Therefore, it is urgent to provide a power supply capable of outputting constant volt...

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