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A power supply circuit with overcurrent protection function

A technology for overcurrent protection and power supply circuits, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., to achieve the effects of saving layout area, avoiding failure problems, and improving reliability

Inactive Publication Date: 2017-06-06
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems existing in the existing low-dropout linear regulator when providing stable power to the chip, and to realize a high-precision, self-powered, high-reliability chip internal power supply circuit

Method used

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  • A power supply circuit with overcurrent protection function
  • A power supply circuit with overcurrent protection function
  • A power supply circuit with overcurrent protection function

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Embodiment Construction

[0014] Below in conjunction with accompanying drawing, describe technical scheme of the present invention in detail:

[0015] The system topology diagram of the high-precision self-starting power supply circuit proposed by the present invention is as follows figure 2 The shown is composed of 5 parts, error amplifier unit, bias circuit, overload protection circuit, excess power supply protection circuit and power adjustment output stage; the error amplifier compares the feedback information of the output voltage with the reference voltage, and outputs the gate-source voltage of the power transistor for adjustment , so as to achieve the purpose of adjusting the output; the overcurrent protection is connected between VDD and the output voltage VOUT, and the circuit will be shut down after detecting the overcurrent; the overpower supply protection is connected between the output voltage and the ground, when switching from heavy load to light In the process of loading, this branch...

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Abstract

The invention belongs to the technical field of power supply management and relates to a power supply circuit with an overcurrent protection function. Compared with the existing related power supply modules, the internal power supply circuit of the present invention adopts the form of self-power supply link, which greatly reduces the use of high-voltage transistors and effectively saves the layout area. On the other hand, after integrating overload protection, it effectively avoids The failure problem caused by the chip under excessive load improves the reliability of the system. At the same time, the excess power supply protection effectively improves the overshoot spike caused by the jump from heavy load to light load, improves the transient response and effectively improves the output. voltage accuracy.

Description

technical field [0001] The invention belongs to the technical field of power supply management and relates to a power supply circuit with an overcurrent protection function. Background technique [0002] From the peripheral power supply to the internal power supply of the chip, related modules inside the chip need to be used to reduce the voltage or enhance the stability of the power supply. In the traditional sense, it is usually completed by a low dropout regulator (Low Dropout Regulator, LDO). . The essence of LDO is to use the stable voltage generated by the bandgap reference and the negative feedback control loop to obtain an output voltage that basically does not change with the environment, and at the same time it can provide a large load capacity. Existing typical LDOs such as figure 1 As shown, it specifically includes: adjustment tube MP1, error amplifier EA, resistor feedback network, load resistor RL, and load capacitor CL. Its basic working principle is: the ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/573
CPCG05F1/573
Inventor 周泽坤李天生曹建文石跃徐俊丁力文张波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA