A linear power supply graded adjustment output circuit

Abstract

The invention discloses a linear power supply graded adjustment output circuit. Linear adjustable regulated power supply adjustment tubes generally use triodes and MOS tubes. The triode works in the amplification area. Its advantages are small ripple, low noise, and wide adjustment range. However, there is a voltage drop between the emitter and the collector of the triode itself. , will cause a large energy loss, and the tube will generate more heat, which requires a good heat dissipation device. The invention adopts two-stage adjustment power supply output, which can effectively improve the output width and output precision of power supply current adjustment, reduce the pressure drop loss of the tube, improve the service life of the adjustment tube, and the circuit structure is simple, so it has a good application prospect in the precision measurement power supply .

Description

technical field [0001] The invention relates to the technical field of linear power supplies, in particular to a linear power supply graded adjustment output circuit. Background technique [0002] The linear regulated power supply has the advantages of small ripple, low noise, and wide adjustment range, and is widely used in precision measuring instruments and meters. However, the linear power supply adjustment tube is generally adjusted by a high-power triode or MOS tube. When the MOS tube is adjusted, it is always at a high speed. Switching of the switching state has disadvantages such as high noise, easy heating, and low service life of the tube; and the high-power triode also has disadvantages as an adjustment tube: the triode is in an amplified state, and there is a voltage drop between the collector and the emitter, resulting in large circuit losses. Therefore need a kind of new technical scheme to solve the above problems. Contents of the invention [0003] In orde...

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Problems solved by technology

[0002] The linear regulated power supply has the advantages of small ripple, low noise, and wide adjustment range, and is widely used in precision measuring instruments and meters. However, the linear power supply adjustment tube is generally adjusted by a high-power triode or MOS tube. When the MOS tube is adjusted, it is always at a high speed. The switching state of the switch has the disadvantages of high noise, easy heating, and low service life of the tube; and the high-power triode also has disadvantages as an adjustment tube: the triode is in an amplified state, and there is a voltage drop between the collector and the emitter, resulting in large circuit losses.

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