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Improved charger output end overcurrent protection circuit

An overcurrent protection circuit and output terminal technology, applied in emergency protection circuit devices, protection against overcurrent, battery circuit devices, etc. problem, to achieve the effect of strong versatility and convenient use

Pending Publication Date: 2021-05-25
东莞市福洋电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The output of the current charger does not have a protection circuit due to overcurrent that pulls the voltage down to a settable voltage value, resulting in the risk of damage to electrical products when the output current of the charger output is overcurrent, and it is not safe to use. And can not protect electrical products well

Method used

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  • Improved charger output end overcurrent protection circuit

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with specific embodiments and accompanying drawings.

[0017] See figure 1 As shown, it is an improved charger output overcurrent protection circuit, which includes a first operational amplifier 11, a delay module 2 connected to the + pin of the first operational amplifier 11, and a - pin of the first operational amplifier 11. The voltage divider module 3 connected to the pin, the second operational amplifier 12, the 2.5V reference voltage module 5 connected to the + pin of the second operational amplifier 12, the overcurrent detection module 6 connected to the - pin of the second operational amplifier 12 , the delay module 2 and the voltage divider module 3 are connected to the VDD power supply terminal 71 in the charger output terminal 7, the delay module 2 includes a charging capacitor C1, and the out pin of the first operational amplifier 11 is connected to the charger output terminal 7 The delay ...

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PUM

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Abstract

The invention discloses an improved charger output end overcurrent protection circuit. The circuit comprises a first operational amplifier, a delay module connected with a positive pin of the first operational amplifier, a voltage division module connected with a negative pin of the first operational amplifier, a second operational amplifier, a 2.5 V reference voltage module connected with a positive pin of the second operational amplifier, and an overcurrent detection module connected with a negative pin of the second operational amplifier. The delay module and the voltage dividing module are both connected with a VDD power supply end in the output end of the charger, the delay module comprises a charging capacitor C1, an out pin of the first operational amplifier is connected with a delay trigger signal end in the output end of the charger, the delay trigger signal end is connected with a charging current loop, and an out pin of the second operational amplifier is connected with a B pole of the triode. The C pole of the triode is connected with an optocoupler in the output end of the charger, the optocoupler is connected with the locking and closing primary loop, and the overcurrent detection module is connected with the output V + end in the output end of the charger.

Description

Technical field: [0001] The invention relates to the technical field of chargers, in particular to an improved charger output terminal overcurrent protection circuit. Background technique: [0002] A charger is a device for charging various electronic products, which is widely used and becomes an indispensable part of electronic products. [0003] The output of the current charger does not have a protection circuit due to overcurrent that pulls the voltage down to a settable voltage value, resulting in the risk of damage to electrical products when the output current of the charger output is overcurrent, and it is not safe to use. And it can't protect electrical products well. [0004] In view of this, the inventor proposes the following technical solutions. Invention content: [0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide an improved charger output terminal overcurrent protection circuit. [0006] In order to ...

Claims

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Application Information

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IPC IPC(8): H02J7/00H02H7/20H02H7/18H02H3/08
CPCH02H3/08H02H7/18H02H7/20H02J7/00
Inventor 黄少成
Owner 东莞市福洋电子有限公司