Over-voltage protection in portable equipment

Abstract

The invention discloses an overvoltage protection device in a portable device. The device includes an overvoltage detection signal generation unit for detecting an overvoltage of power applied from an external device and outputting an overvoltage detection signal; an overvoltage interruption unit controlled by the overvoltage detection signal of the overvoltage signal generation unit, which determines the whether the applied power should be supplied to the main circuit; and an overvoltage and return current interrupting unit for delivering or interrupting power applied to the main circuit and interrupting current flowing back from the battery according to the determination of the overvoltage interrupting unit.

Description

[0001] Cross References to Related Applications [0002] The entire disclosure of Korean Patent Application No. 10-2003-0087841 filed on December 5, 2003, including specification, claims, drawings and abstract, is incorporated herein by reference. Background of the invention [0003] 1. Technical field [0004] The present invention relates to mobile communication terminals, and more particularly to an overvoltage protection device in portable devices in which batteries are incorporated, such as mobile communication terminals, PDAs (Personal Digital Assistants), notebook computers and portable audio devices. [0005] 2. Background technology [0006] Recently, due to the development of semiconductor and battery manufacturing technologies, etc., various devices such as mobile communication terminals, PDAs, notebook computers, and portable audio equipment have been manufactured to be portable, and when batteries or rechargeable batteries are installed, making phones Calls, ...

AI Technical Summary

Problems solved by technology

In this case, even when power is not supplied from the external interface unit 10, the power supplied by the battery connected to the portable device flows back to the transistors TR1, TR2 through the activated PMOS transistor 12, so that the current charged in the battery 13 to be consumed unnecessarily

[0015] Therefore, in the prior art described above, when the gate and source of the PMOS transistor 12 are connected through the resistor R2, and then the gate voltage of the PMOS transistor 12 is adjusted to interrupt the overvoltage according to whether the overvoltage is detected, there is a problem, That is, the power of the battery 13 is unnecessarily consumed by transistors TR1, TR2, which are connected to control the PMOS transistor 12

That is, although the main circuit can be protected even when a sudden overvoltage is momentarily applied, the power of the battery 13 is unnecessarily consumed by the return current

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