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Battery protection circuit and power supply system

A technology for protecting circuits and batteries, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as inability to use equipment in a normal way, and achieve the effect of increasing reverse polarity protection and improving safety.

Active Publication Date: 2020-02-11
BEIJING QDING INTERCONNECTION TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, considering that there will be a situation when using this type of battery power, that is, when the device is turned off, the battery is exhausted, and the user cannot replace the battery externally, the device cannot be used in a normal way

Method used

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  • Battery protection circuit and power supply system
  • Battery protection circuit and power supply system
  • Battery protection circuit and power supply system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Please refer to image 3, this embodiment proposes a battery protection circuit 1, which can be used in some electronic devices such as smart door locks, that is, the main power supply is provided by a power supply battery and an external interface needs to be reserved for external power supply in emergency situations. The battery protection circuit 1 includes a power supply battery 10 , an external power supply interface 20 , a first PMOS transistor Q1 , a first resistor R1 and an external power supply switch circuit 30 .

[0043] Specifically, such as image 3 As shown, the positive pole of the power supply battery 10 is connected to the drain of the first PMOS transistor Q1, and the negative pole thereof is grounded and connected to one end of the first resistor R1. Both the external power supply interface 20 and the other end of the first resistor R1 are connected to the gate of the first PMOS transistor Q1, and the source of the first PMOS transistor Q1 is used to...

Embodiment 2

[0061] Please refer to Figure 5 , based on the battery protection circuit in Embodiment 1 above, this embodiment proposes a power supply system 100 for supplying power to devices having a power supply battery circuit and an external power supply circuit that can be connected to an external power source. The power supply system 100 includes a target device 2 and a battery protection circuit 1 . The battery protection circuit includes a power supply battery 10 , an external power interface 20 , a first PMOS transistor Q1 , a first resistor R1 and an external power switch circuit 30 .

[0062] Specifically, the positive pole of the power supply battery 10 is connected to the drain of the first PMOS transistor Q1, and the negative pole thereof is grounded and connected to one end of the first resistor R1. Both the external power supply interface 20 and the other end of the first resistor R1 are connected to the gate of the first PMOS transistor Q1, and the source of the first PMO...

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PUM

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Abstract

The invention discloses a battery protection circuit and a power supply system. The battery protection circuit comprises a power supply battery, an external power interface, a first PMOS transistor, afirst resistor and an external power switch circuit. The positive electrode of the power supply is connected to the drain of the first PMOS transistor, and the negative electrode of the first PMOS transistor is grounded and connected to one end of the first resistor. The other end of the external power interface and the first resistor are connected to the gate of the first PMOS transistor, and the source thereof is used for connecting the target device to provide the system power. The input end of the external power switch circuit is connected with an external power interface, and the outputend thereof is connected with the source of the first PMOS transistor. The external power interface is used for connecting the external power supply when the power supply battery is not working. The technical proposal of the invention can realize the safe power supply by connecting an external power supply through a reserved interface when the system power supply battery of the equipment is consumed, can improve the safety of the equipment power supply system, and also can increase the reverse connection protection of the power supply battery and the like.

Description

technical field [0001] The invention relates to the technical field of power supply design, in particular to a battery protection circuit and a power supply system. Background technique [0002] In recent years, for some smart hardware items such as smart door locks, most of the products are designed with low power consumption, so they are powered by removable AA batteries (ie dry batteries). However, considering that there will be a situation when using this type of battery for power supply, that is, when the device is turned off and the battery is exhausted, and the user cannot replace the battery from the outside, the device cannot be used in a normal way. At this time, the existing solution is to provide external power supply through the externally reserved USB power supply interface, so that the device can be used normally again. [0003] Taking the smart door lock as an example, when the dry battery of the smart door lock device is used up, the user cannot use passwor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/18
CPCH02H7/18
Inventor 姜东帅
Owner BEIJING QDING INTERCONNECTION TECHNOLOGY CO LTD