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Linear voltage stabilizing circuit

A linear voltage stabilizing circuit and circuit technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve the problem of reduced circuit current conversion efficiency, and achieve the effect of high current conversion efficiency and stability compensation

Active Publication Date: 2014-03-19
大唐电信科技产业控股有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, when the load of the circuit becomes light or no-load, the fixed current loss will always exist, and the current conversion efficiency of the entire circuit will decrease

Method used

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Embodiment Construction

[0093] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0094] see Figure 4 , which is a structural diagram of Embodiment 1 of the linear voltage stabilizing circuit provided by the present invention.

[0095] The present invention provides a linear voltage stabilizing circuit, comprising: a reference voltage circuit Z1, an error amplifier A1, a feedback circuit, a compensation circuit and an adjustment tube Mp;

[0096] The compensation circuit includes a first PMOS transistor Mp1 and a first NMOS transistor Mn1;

[0097] The gate of the first NMOS transistor Mn1 is connected to the output terminal of the error amplifier A1, the source is grounded, and the drain is connected to the drain of the first PMOS transistor Mp1;

[0098] The drain of the first PMOS transistor Mp1 is connected t...

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Abstract

The invention provides a linear voltage stabilizing circuit. A compensation circuit is added, and the linear voltage stabilizing circuit comprises a first PMOS (P-channel metal oxide semiconductor) tube and a first NMOS (N-channel metal oxide semiconductor) tube. A grate of the first NMOS tube is connected with an output end of the error amplifier, a source of the first NMOS tube is grounded, and a drain of the first NMOS tube is connected with a drain of the first PMOS tube. The drain of the first PMOS tube is connected with the grate of the first PMOS tube and a grate of an adjustment tube. The first PMOS tube and the adjustment tube form a current mirror, and accordingly branch current of the first PMOS tube and the adjustment tube is in direct proportion to load current IL. The first PMOS tube and the first NMOS tube can lead the grate of the adjustment tube to be a low-resistance node, a low-frequency pole at the low-resistance node can be in high frequency, and stability of the whole circuit is compensated. Resistance of the grate of the adjustment tube varies with the load, little current is consumed in light load, and the current is barely consumed in a no-load state. High current conversion efficiency in light load or no load state can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of power supplies, in particular to a linear voltage stabilizing circuit. Background technique [0002] With the development of technology, portable products are more and more widely used. In order to increase the standby time of portable products, it is necessary to reduce the static power consumption when the whole machine is working, so the power supply needs to have higher conversion efficiency. A linear voltage regulator circuit is currently a better choice as a power supply. The linear voltage regulator circuit is a DC-DC (DC / DC) converter, which converts the input DC voltage into another DC voltage output to supply power to the load. [0003] Combine below figure 1 Introduce the working principle of the linear voltage regulator circuit. [0004] see figure 1 , which is a structural diagram of a typical linear voltage regulator circuit in the prior art. [0005] The input voltage of the linear re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
Inventor 王磊
Owner 大唐电信科技产业控股有限公司
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