Excess voltage protection circuit, method of protecting a circuit from excess voltage, and semiconductor apparatus having the excess voltage protection ciruit

A technology for protecting circuits and voltage generating circuits, applied in the protection of overvoltage, semiconductor devices, semiconductor/solid-state device manufacturing, etc., to achieve high circuit design efficiency and production efficiency, downsizing, and reducing production costs.

Inactive Publication Date: 2009-01-14
RICOH MICROELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

Then, the voltage across the resistor R123 becomes substantially equal to the voltage from the AC adapter 111, which turns off the PMOS transistor M122, thereby preventing power from being supplied to the CMOS IC 122

Method used

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  • Excess voltage protection circuit, method of protecting a circuit from excess voltage, and semiconductor apparatus having the excess voltage protection ciruit
  • Excess voltage protection circuit, method of protecting a circuit from excess voltage, and semiconductor apparatus having the excess voltage protection ciruit
  • Excess voltage protection circuit, method of protecting a circuit from excess voltage, and semiconductor apparatus having the excess voltage protection ciruit

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Embodiment Construction

[0047] Referring to the drawings, an overvoltage protection circuit, a method of protecting a circuit from overvoltage, and a semiconductor device having the overvoltage protection circuit according to embodiments of the present invention will be described.

[0048] FIG. 3 shows an example of a semiconductor device with an overvoltage protection circuit according to an embodiment of the present invention. In this embodiment, the semiconductor device is a battery charger. In FIG. 3, a semiconductor device 1 uses an AC adapter 10 connected between a ground terminal GND and an input terminal ADPIN as a power source to charge a rechargeable battery 11 connected to a connector terminal BAT. Specifically, the semiconductor device 1 includes a charging circuit 2 that charges a rechargeable battery 11 by using an AC adapter 10 as a power source, and an overvoltage protection circuit 3 that protects the charging circuit 2 from overvoltage. Voltage. In addition, the semiconductor devi...

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Abstract

In a disclosed excess voltage protection circuit, when the input voltage equal to or higher than a predetermined maximum voltage is detected by an excess voltage detection circuit, a switching element is shut off so as to prevent the input voltage being output from the excess voltage protection circuit. A voltage obtained by dividing the input voltage using resistors is output from the excess voltage protection circuit.

Description

technical field [0001] The present invention relates to an overvoltage protection circuit for protecting a circuit from overvoltage input to an input terminal, a method for protecting a circuit from overvoltage, and a semiconductor device having the overvoltage protection circuit. In particular, the present invention relates to an overvoltage protection circuit suitable for incorporation into equipment powered by an AC adapter. Background technique [0002] Currently, electric devices loaded with rechargeable batteries are widely used, such as cellular phones, digital cameras, and the like. When an AC adapter is connected to such a device, the device can operate on power supplied by the AC adapter, and at the same time the rechargeable battery can be charged. As such devices became more widely used, various AC adapters with different output voltages came into use. Since only limited types of connectors for AC adapters are available, AC adapters outputting different voltage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/20H01L21/822H01L27/04
CPCH01L27/0285H02H3/20H02M3/155H03K17/08
Inventor 植田忠义
Owner RICOH MICROELECTRONICS CO LTD
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