Voltage detection device and insulation detecting apparatus for non-grounded power supply including the voltage detection device

Inactive Publication Date: 2007-01-04
YAZAKI CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0033] In such a configuration, since the correction of a detection voltage does not involve any calculation and conversion that can introduce an error as thus described, the accuracy of a detection volta

Problems solved by technology

However, since a Schottky barrier diode has a character that a leakage current at the same becomes greater as the ambient temperature increases, a voltage drop or voltage loss through the Schottky barrier diode increases with the ambient temperature.
For this reason, a voltage detection circuit having a Schottky barrier diode has a problem in the accuracy of a detection voltage detected at an input port of a microcomputer.
However, the characteristics of a Schottky barrier diode do not necessarily agree with specifications shown on the data book and may include variations.
Therefore, the calculation and conversion are repeated with a possibility of an error, and an erro

Method used

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  • Voltage detection device and insulation detecting apparatus for non-grounded power supply including the voltage detection device
  • Voltage detection device and insulation detecting apparatus for non-grounded power supply including the voltage detection device
  • Voltage detection device and insulation detecting apparatus for non-grounded power supply including the voltage detection device

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Example

[0041] An embodiment of a voltage detection circuit employing the invention and an insulation detector having the voltage detection circuit will now be described with reference to FIGS. 1 to 4. FIG. 1 shows a schematic configuration of the voltage detection circuit employing the invention and the insulation detector having the voltage detection circuit. FIG. 2 is a flow chart showing an operation of calculating an insulation resistance performed by the insulation detector having the voltage detection circuit employing the invention. FIG. 3 is a time chart showing states of charging and discharging of a capacitor in response to operations of switch sections and timing for voltage reading. FIG. 4 shows errors in detection of insulation resistance values detected during power supply voltage measuring times associated with the insulation resistance values.

[0042] As shown in FIG. 1, a voltage detection circuit 1 of the present embodiment includes a microcomputer 3. A part 6 to be voltag...

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Abstract

A voltage detection device includes a processor that has a first input port, and a second input port grounded at a first ground potential part, a first Schottky barrier diode that has a cathode connected to a junction of an electric wire between the first input port and a voltage detection object part, and an anode grounded at a second ground potential part, and a second Schottky barrier diode that has an anode connected to a junction of an electric wire between the second input port and a third ground potential part, and a cathode connected to a positive terminal of a power supply. When the processor detects a voltage at the voltage detection object part, the processor detects a value obtained by adding a voltage applied to the second input port to a voltage applied to the first input port as the voltage.

Description

BACKGROUND OF THE INVENTION [0001] The present invention relates to a voltage detection device and an insulation detecting apparatus for a non-grounded power supply includiing the voltage detection device and, more particularly, to a voltage detection device for detecting a voltage using a microcomputer and an insulation detecting apparatus for a non-grounded power supply including the voltage detection device. [0002] A voltage detection circuit for detecting a voltage using a microcomputer is equipped with a clamping diode for preventing the application of an excessive positive or negative voltage which can damage the microcomputer to an input port of the microcomputer to which a part subjected to voltage detection is connected. A rectifier diode may be used as the clamping diode to prevent the application of an excessive positive or negative voltage to the input port of the microcomputer for a relatively short time. However, in order to prevent the application of an excessive posi...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R19/2503
Inventor KAWAMURA, YOSHIHIRO
Owner YAZAKI CORP
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