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Voltage detection device

A technology of voltage detection and detection parts, applied in the field of non-contact voltage detection devices

Active Publication Date: 2010-11-10
HIOKI DENKI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The impedance of the circuit passing through the detection resistor viewed from the conductor side is the added value of the resistance value of the detection resistor and the reactance of the third electrostatic capacitance. However, due to the difference between the resistance value of the detection resistor and the third electrostatic capacitance The reactance is so small that it can be ignored, so the above impedance becomes the reactance of the third electrostatic capacitance

Method used

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Embodiment Construction

[0067] Hereinafter, embodiments of the voltage detection device and the line voltage detection device will be described with reference to the drawings.

[0068] 【First Embodiment】

[0069] First, a voltage detection device 101 according to a first embodiment of the present invention will be described with reference to the drawings.

[0070] The voltage detection device 101 is a non-contact voltage detection device, such as figure 1 As shown, a floating circuit unit 2 and a main circuit unit 3 are provided, and are configured to detect an AC voltage V1 (detection target AC voltage) generated on a detection target 4 without contact with a ground potential Vg as a reference.

[0071] Such as figure 1 As shown, the floating circuit part 2 is provided with a guard electrode 11 , a detection electrode 12 , a power supply part 13 , a detection part 14 and an insulating part 15 . The guard electrode 11 is made of a conductive material (such as a metal material), and is configured...

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Abstract

A voltage detection device detects an objective AC voltage arising on a detection object. The voltage detection device includes a detecting electrode placed so as to be capacitively coupled with the detection object; a reference signal output section for outputting a reference signal; a detecting section outputting a detection signal changing its amplitude in accordance with both current values of a detection object current flowing according to the objective AC voltage and a reference current flowing according to the reference signal; and a signal extracting section for extracting a signal component of the objective AC voltage from an amplified detection signal and outputting the signal component as an output signal, the amplified detection signal being obtained through controlling a gain for amplifying the detection signal so as to make a signal component of the reference signal included in the detection signal have a predetermined value.

Description

[0001] The priority claimed by this application is 2009-110304 filed on April 30, 2009, 2009-116546 filed on May 13, 2009, and 2009-116546 filed on July 21, 2009 169731, application number 2009-180785 filed on August 3, 2009, application number 2010-69677 filed on March 25, 2010, application number 2010-69695 filed on March 25, 2010, and 2010 Japanese Patent Application No. 2010-69714 filed on March 25, the contents of which are hereby incorporated by reference. technical field [0002] The present invention relates to a non-contact voltage detection device that detects a detection target AC voltage of a detection target in a non-contact manner. Background technique [0003] As this voltage detection device, known patent document 1: Japanese Patent No. 3158063 (pages 4-6, image 3 ) disclosed in the non-contact voltage measurement device (hereinafter also referred to as "voltage detection device"). This voltage detection device is provided with: a detection probe (sensing p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00
CPCG01R19/2503G01R19/0084G01R15/06
Inventor 柳泽浩一
Owner HIOKI DENKI KK
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