Voltage pre-stabilizing circuit and power supply

Abstract

The invention discloses a voltage pre-stabilizing circuit and a power supply. The pre-voltage-stabilizing circuit comprises a controllable voltage-stabilizing source, a first voltage dividing module, a second voltage dividing module, a voltage limiting module, a first power supply input end, a second power supply input end, a first power supply output end and a second power supply output end, the first end of the first voltage dividing module is electrically connected with the first power supply input end, the second end of the first voltage dividing module is electrically connected with the first end of the controllable voltage stabilizing source, and the voltage dividing output end of the first voltage dividing module is electrically connected with the first end of the voltage limiting module; the second end of the controllable voltage stabilization source is electrically connected with the second power supply input end, and the reference end of the controllable voltage stabilization source is electrically connected with the voltage division output end of the second voltage division module; the second end of the voltage limiting module is electrically connected with the first end of the second voltage dividing module and the first power supply output end; and the second end of the second voltage division module is electrically connected with the second power supply input end and the second power supply output end. According to the invention, the controllability and precision of the output voltage of the pre-voltage-stabilizing circuit can be improved.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of power supplies, in particular to a pre-stabilizing circuit and a power supply. Background technique [0002] The pre-stabilizing circuit can output the voltage input from its input terminal through its output terminal after preliminary stabilization, and has an important application in the field of modern electronic technology. [0003] The traditional pre-regulator circuit usually only obtains the voltage of a Zener tube voltage minus the conduction voltage drop of the triode through the combination of the Zener tube and the triode, that is, the output voltage can only depend on the voltage of the Zener tube, however As the temperature of the voltage regulator tube and triode increases, there will usually be a large deviation in accuracy, which is uncontrollable under certain circumstances, thus limiting the application of the pre-regulator circuit. Contents of the invention ...

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Problems solved by technology

[0003] The traditional pre-regulator circuit usually only obtains the voltage of a Zener tube voltage minus the conduction voltage drop of the triode through the combination of the Zener tube and the triode, that is, the output voltage can only depend on the voltage of the Zener tube, however As the temperature of the Zener tube and the triode rises, there is usually a large deviation in accuracy, which is uncontrollable under certain circumstances, thus limiting the application of the pre-regulator circuit

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