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Voltage detecting circuit

A voltage detection circuit and circuit technology, applied in the direction of measuring current/voltage, measuring device, adjusting electrical variables, etc., can solve the problem of reducing the driving ability of the injected current, and achieve the effect of reducing the current and suppressing the leakage current.

Inactive Publication Date: 2005-06-08
SEIKO INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the size of the N-channel MOS transistor is reduced, it will face the problem of reduced sink current driving capability in the detection state

Method used

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Embodiment Construction

[0019] FIG. 1 is a circuit configuration diagram of a voltage detection circuit according to a first embodiment of the present invention. The input of the voltage selection circuit 50 is connected to the output of the comparator 17 , and the output of the voltage selection circuit 50 is connected to the back gate of the output N-channel MOS transistor 41 . According to the output of the comparator 17, when the voltage detection circuit is in the release state, the voltage selection circuit 50 is used to reduce the bias potential of the back gate of the output N-channel MOS transistor 41; Circuit 50 is used to increase the bias potential of the back gate of output N-channel MOS transistor 41 .

[0020] FIG. 2 shows a circuit diagram of the voltage selection circuit 50 . This voltage selection circuit 50 includes an inverter 51 , an N-channel MOS transistor 52 , an N-channel MOS transistor 53 and a battery 54 .

[0021] When the voltage detection circuit is in the released sta...

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PUM

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Abstract

The present invention provides a voltage detection circuit in which leakage current of an output transistor is suppressed to reduce consumed current without reducing the driving capability of the output transistor. The voltage detection circuit is configured to control the voltage of the back gate of the output transistor according to whether the voltage detection circuit is in the detection state or in the release state.

Description

technical field [0001] The present invention relates to a voltage detection circuit for detecting a voltage value generated across a detection terminal to change an output. Background technique [0002] Fig. 3 is a circuit configuration diagram of a voltage detection circuit (see Japanese Patent JP 2002-296306 A). Terminals for detecting voltages generated across them are connected to terminals 11 and 10, respectively. In the case of the voltage detection circuit shown in FIG. 3, the terminals of the battery 1 are connected to the terminals 11 and 10, respectively. Voltage dividing resistors 13 and 14 are connected between terminals 11 and 10 . A node between voltage dividing resistors 13 and 14 and a reference voltage source 15 are connected to an input of a comparator 17 . The output buffer circuit 18 is connected to the output of the comparator 17 , and the output of the output buffer circuit 18 is connected to the output terminal 12 . The description of the power supp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/165G01R31/08G05F1/10
CPCG01R19/16566G01R19/165
Inventor 杉浦正一
Owner SEIKO INSTR INC