Wide-range linear voltage stabilizing circuit

Abstract

The invention belongs to the technical field of circuits and provides a wide-range linear voltage stabilizing circuit. The wide-range linear voltage stabilizing circuit comprises N-stage series voltage divider circuits in series connection with two ends of input voltage V1. A first-stage series voltage divider circuit comprises a linear voltage stabilizer Q1, an input end of the linear voltage stabilizer Q1 is connected with one end of a clamping circuit U1 and a discharging circuit D1, an output end of the linear voltage stabilizer Q1 is connected with the other end of the discharging circuitD1, one end of a resistor R1 and one end of a starting switching circuit S1. The other end of the clamping circuit U1, the other end of the resistor R1 and the other end of the starting switching circuit S1 are connected with a ground phase of the linear voltage stabilizer Q1. An input of a second-stage series voltage divider circuit is connected with the discharging circuit D1 of the first-stageseries voltage divider circuit, and an input of an N-stage series voltage divider circuit is connected with a discharging circuit DN-1 of an N-1-stage series voltage divider circuit. The wide-range linear voltage stabilizing circuit has advantages of high reliability and cascadable, and voltage stability is realized.

Description

technical field [0001] The invention belongs to the technical field of circuits, and in particular relates to a wide-range linear voltage stabilizing circuit, which is applied to occasions requiring high-voltage input voltage and low-voltage output power supply. Background technique [0002] In the application of power supply products, linear voltage regulators are often used. Generally, voltage regulators are limited by power devices when they are used, and often cannot meet the requirements of input high voltage. At present, the commonly used method is to realize high-voltage input and low-voltage output through series connection of voltage regulators; however, there is a situation that the voltage cannot be stabilized when the load of the two voltage regulators is unbalanced in the way of series connection of voltage regulators. When switching, due to the single-phase conduction characteristics of the voltage regulator and current sharing problems, the two voltage regulat...

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Problems solved by technology

[0002] In the application of power supply products, linear regulators are often used. Generally, regulators are limited by power devices when they are used, and often cannot meet the requirements of high input voltage.

At present, the commonly used method is to realize high-voltage input and low-voltage output through series connection of voltage regulators; however, there is a situation that the voltage cannot be stabilized when the load of the two voltage regulators is unbalanced in the way of series connection of voltage regulators. When switching, due to the single-phase conduction characteristics of the voltage regulator and the current sharing problem, the two voltage regulators often have uneven voltage division, which causes the circuit to enter a locked state and cannot continue to work stably

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