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Undervoltage protection circuit and power supply

An undervoltage protection and circuit technology, which is applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of affecting undervoltage detection and protection, low accuracy of undervoltage protection, and difference in operating voltage, so as to achieve reliable undervoltage protection , Prevent shocks and improve reliability

Inactive Publication Date: 2016-09-07
GUANGDONG OPPO MOBILE TELECOMM CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in this method, although the resistance value added between the DC side and the pin of the power management chip is the same, the operating voltage of the undervoltage protection voltage of different chips will be different, and the accuracy of the undervoltage protection is not high.
In addition, when the load is relatively large, voltage fluctuations may occur on the DC side, affecting undervoltage detection and protection

Method used

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  • Undervoltage protection circuit and power supply
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  • Undervoltage protection circuit and power supply

Examples

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Embodiment 1

[0019] Figure 1a It is a structural diagram of an undervoltage protection circuit provided by Embodiment 1 of the present invention. see Figure 1a , the undervoltage protection circuit provided in this embodiment includes an AC power supply 10, a rectification module 11, a power management module 12 and an undervoltage detection module 13;

[0020] The input terminal of the rectification module 11 is electrically connected to the output terminal of the AC power supply 10, and is used for rectifying the AC current output by the AC power supply 10, and outputting the rectified DC current;

[0021] The input terminal of the undervoltage detection module 13 is electrically connected to the output terminal of the AC power supply 10, and the output terminal of the undervoltage detection module 13 is electrically connected to the control terminal of the power management module 12, so that the voltage of the AC current output by the AC power supply 10 is less than When the first thr...

Embodiment 2

[0032] figure 2 It is a schematic structural diagram of an undervoltage protection circuit provided in Embodiment 2 of the present invention. This embodiment is optimized on the basis of the first embodiment above.

[0033] On the basis of the first embodiment above, the undervoltage detection module 13 includes a rectification unit 131, a voltage division unit 132 and a level signal detection unit 133;

[0034] The input terminal of the rectification unit 131 is electrically connected to the output terminal of the AC power supply 10, and is used for rectifying the AC power supply 10 and outputting a rectified DC current;

[0035] The input terminal of the voltage dividing unit 132 is electrically connected to the output terminal of the rectifying unit 131, and is used to divide the voltage of the input DC current and output the divided voltage;

[0036] The control signal input terminal of the level signal detection unit 133 is electrically connected to the output terminal...

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Abstract

The invention discloses an undervoltage protection circuit and a power supply. The undervoltage protection circuit comprises an alternating current power supply, a rectifier module, a power supply management module and an undervoltage detection module, wherein the input end of the rectifier module is electrically connected with the output end of the alternating current power supply, and the rectifier module is used for rectifying the alternating current output by the alternating current power supply and outputting the rectified direct current; the input end of the undervoltage detection module is electrically connected with the output end of the alternating current power supply; the output end of the undervoltage detection module is electrically connected with the control end of the power supply management module, and the undervoltage detection module is used for controlling the state of the control end of the power supply management module to be a closed state when the voltage of the alternating current output by the alternating current power supply is less than a first set threshold value; and the input end of the power supply management module is electrically connected with the output end of the rectifier module and the power supply management module is used for stopping operation when the state of the control end is the closed state. According to the undervoltage protection circuit provided by the invention, undervoltage protection can be carried out accurately, and the reliability of the circuit is improved.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of power supplies, in particular to an undervoltage protection circuit and a power supply. Background technique [0002] The existing switching power supply is generally integrated with an alternating current / direct current (AC / DC) converter. The AC / DC converter is a converter for converting alternating current into direct current. An AC / DC power management chip is used in the AC / DC converter. [0003] At present, many AC / DC power management chips have an undervoltage protection function. Specifically, a resistor is connected in series between the high voltage on the direct current (DC) side and a pin of the power management chip, and the power management chip detects the voltage on the pin, and performs undervoltage protection according to the voltage on the pin. [0004] However, in this method, although the resistance value added between the DC side and the pin of the power mana...

Claims

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Application Information

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IPC IPC(8): H02H7/125
CPCH02H7/125
Inventor 刘绍斌
Owner GUANGDONG OPPO MOBILE TELECOMM CORP LTD
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