Overvoltage protection circuit

An overvoltage protection circuit, overvoltage protection technology, applied in emergency protection circuit devices, protections that respond to overvoltage, electrical components, etc.

Inactive Publication Date: 2013-10-23
SHENZHEN FUTAIHONG PRECISION IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the existing overvoltage protection circuit is applied to a high-voltage battery, when the high-voltage battery is charged to 4.2V, it will be ...

Method used

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Examples

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Embodiment Construction

[0012] see figure 1 , the preferred embodiment of the present invention provides an overvoltage protection circuit 100, which can be applied to a portable electronic device (not shown) such as a mobile phone, a personal digital assistant (Personal Digital Assistant, PDA), to pass a charging The device 200 charges the battery 300 of the portable electronic device and provides overvoltage protection for the battery 300 . In this embodiment, the charging device 200 is a universal serial bus (Universal Serial BUS, USB) interface charger. The battery 300 is a high-voltage battery for outputting a standard voltage (for example, 4.35V voltage) to provide power for the portable electronic device.

[0013] Please also refer to figure 2 , the overvoltage protection circuit 100 includes an overvoltage protection chip 11 and a charging chip 13 .

[0014] The overvoltage protection chip 11 is electrically connected to the charging device 200 and the charging chip 13 . The overvoltage ...

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PUM

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Abstract

The invention provides an overvoltage protection circuit, which comprises an overvoltage protection chip and a charging chip. The overvoltage protection chip compares the voltage of a voltage detection pin with a reference voltage; when the voltage of the voltage detection pin is lower than the reference voltage, the overvoltage protection chip enables the charging chip, so that the charging chip is driven to charge a high voltage battery; and when the voltage of the voltage detection pin equals to or is greater than the reference voltage, the overvoltage protection chip stops enabling the charging chip, so that the charging chip stops charging the high voltage battery. Once the overvoltage protection circuit of the invention detects that the charging voltage of the high voltage battery exceeds the maximal voltage thereof, enablement for the charging chip is stopped immediately, so that charging for the high voltage battery is stopped, and overvoltage protection for the high voltage battery is further realized.

Description

technical field [0001] The invention relates to an overvoltage protection circuit, in particular to an overvoltage protection circuit applied to portable electronic devices. Background technique [0002] At present, there are high-voltage batteries on the market, and the voltage when fully charged is generally 4.35V. Compared with the normal voltage battery with a voltage of 4.2V when fully charged, its power capacity can be increased by 20%-30%, which greatly improves the standby time of portable electronic devices such as mobile phones and personal digital assistants (PDA). performance. [0003] Portable electronic devices generally require an overvoltage protection circuit to prevent overcharging. However, if the existing overvoltage protection circuit is applied to a high-voltage battery, when the high-voltage battery is charged to 4.2V, it will be forced to stop charging under the action of the overvoltage protection circuit, causing the high-voltage battery to fail. ...

Claims

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Application Information

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IPC IPC(8): H02H7/18H02H3/20
Inventor 吴海洲
Owner SHENZHEN FUTAIHONG PRECISION IND CO LTD
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