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Power-Limiting Protection Circuit for Bipolar Linear Regulators

A technology of linear voltage stabilizer and overvoltage protection circuit, which is applied in the direction of instruments, regulating electrical variables, control/regulating systems, etc. The effect of reducing the leakage voltage

Active Publication Date: 2016-06-29
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the current limiting resistor R in this traditional power limiting protection circuit 21 directly with adjustment tube Q 22 The emitter is connected, and the current limiting resistor R 21 Has a temperature coefficient and is easily affected by temperature, resulting in an increase in the dropout voltage of a bipolar linear regulator

Method used

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  • Power-Limiting Protection Circuit for Bipolar Linear Regulators
  • Power-Limiting Protection Circuit for Bipolar Linear Regulators
  • Power-Limiting Protection Circuit for Bipolar Linear Regulators

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with accompanying drawing and examples thereof.

[0025] refer to image 3 , the power limiting protection circuit of the present invention includes: a current limiting circuit 1 and an overvoltage protection circuit 2, wherein:

[0026] The overvoltage protection circuit 2 is used to generate an overvoltage protection signal OVP and input it to the first adjustment transistor Q in the bipolar linear voltage regulator 1 to control the first adjustment tube Q 1 The power consumption is within the set range;

[0027] The current limiting circuit 1 includes a current detection circuit 11 , a level detection circuit 12 and a feedback circuit 13 . The current detection circuit 11 is used to detect the current flowing through the second adjustment transistor Q in the bipolar linear voltage regulator 2 The emitter current I O , and generates a sense voltage V corresponding to this current s Input to the...

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Abstract

The invention discloses a power-limiting protection circuit for a bipolar linear voltage regulator, which mainly solves the problem of excessive leakage voltage of the existing bipolar linear voltage regulator. It includes a current limiting circuit (1) and an overvoltage protection circuit (2), and the current limiting circuit (1) includes a current detection circuit (11), a level detection circuit (12) and a feedback circuit (13); the current detection circuit ( 11) Detect the current of the adjustment tube in the bipolar voltage regulator, generate a detection voltage corresponding to the current to the level detection circuit (12), and the level detection circuit (12) generates a control voltage when the detection voltage exceeds a specified value To the feedback circuit (13), the regulator tube current is controlled by the feedback circuit to generate an overcurrent protection signal to control the voltage stabilizer; the overvoltage protection circuit (2) detects an external input power supply and generates an overvoltage protection signal to control the voltage stabilizer power dissipation of the pass tube. The invention can effectively reduce the leakage voltage of the bipolar linear regulator.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits and relates to a power-limited protection circuit, which can be used in a bipolar linear voltage regulator. Background technique [0002] Linear voltage regulator is an important product in analog integrated circuits. Because of its wide application, convenient use, low cost, small size, good performance and high reliability, it has already replaced the original discrete component assembly in various electronic devices. Piezoelectric sources have been developed very rapidly. The output power of linear regulators is generally relatively large, so various protection circuits will be designed in the design and manufacture of the circuit, such as over-temperature protection, over-current protection, etc. [0003] figure 1 shows the system block diagram of a bipolar linear regulator that enables an external input supply V in Or maintain the output voltage V of the bipolar linear regulato...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/569
Inventor 来新泉李佳佳樊洁琼邵丽丽
Owner XIDIAN UNIV
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