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Voltage measurement apparatus

A technology of voltage measurement and voltage measurement circuit, which is applied in the direction of measuring devices, measuring electricity, and measuring electrical variables, etc., and can solve problems that affect the measurement results of voltage measuring circuits

Inactive Publication Date: 2012-07-04
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the on-resistance of the MOSFET produces a voltage drop
Furthermore, when each dry cell has a filter circuit, a voltage drop is also generated in a resistor in the filter circuit for noise removal
As a result, the voltage drop may affect the measurement result of the voltage measurement circuit

Method used

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Examples

Experimental program
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no. 1 example

[0030] refer to figure 1 and figure 2 , shows a voltage measurement device that measures voltage (ie, potential) of a measurement object 1 , which may have a plurality of components. The measurement object 1 may be an assembled battery having a plurality of batteries coupled in series. In this assembled battery, there are a plurality of voltage measurement points 2 respectively having different voltages. Each voltage measurement point 2 is coupled to a measurement terminal 4 with a low-pass filter 3 . The low-pass filter 3 may include a resistor element 3R and a capacitor 3C. Furthermore, capacitor 3C may be coupled to a reference voltage suitable for forming a voltage measurement by using measurement terminal 4 .

[0031] The selector circuit 6 is coupled between the voltage measurement circuit 5 and the measurement terminal 4 corresponding to each of the plurality of voltage measurement points 2 . The selector circuit 6 comprises a plurality of switch circuits 7, where...

no. 2 example

[0047] image 3 A second embodiment is shown in , in which parts similar to those of the first embodiment have similar reference numerals, and differences from the first embodiment are described below. In the second embodiment, a switch circuit 25 is used instead of the switch circuit 7 . The switch circuit 27 comprises two N-channel MOSFETs 26, 27 arranged with a common source connection and a common gate connection such that the N-channel MOSFETs 26, 27 distribution has parasitic diodes 26D, 27D arranged in opposite directions to each other. The gate of each of N-channel MOSFETs 26, 27 is coupled to the drain of P-channel MOSFET 14b, and the source of each of N-channel MOSFETs 26, 27 is coupled to the drain of N-channel MOSFET 16c .

[0048] In the above configuration, similar to the first embodiment, when the constant current Iref is supplied to the ground-side constant current circuit 12 through the control circuit 17, the mirror current Ic (≈Ig) flows to the resistor el...

no. 3 example

[0050] Figure 4 A third embodiment is shown in , in which parts similar to those of the first embodiment have similar reference numerals, and differences from the first embodiment are described below. In the third embodiment, the switch circuit 28 , the power-side constant current circuit 31 and the ground-side constant current circuit 32 replace the switch circuit 17 , the power-side constant current circuit 11 and the ground-side constant current circuit 12 , respectively.

[0051] The switch circuit 28 is configured to have two P-channel MOSFETs 8, 9 in the opposite connection direction to that of the first embodiment, so that the P-channel MOSFETs 8, 9 share a common drain. Furthermore, the parasitic diodes 8D, 9D have a common anode connection such that the diodes 8D, 9D are coupled to each other in opposite directions. The current carrying part of the switching circuit 28 is provided as two resistor elements 29 , 30 . Resistors 29 , 30 are coupled between the source a...

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Abstract

A resistor element that is coupled between each of voltage measurement points of a measurement object and a voltage measurement circuit is further coupled to a path of a constant current between a power supply side constant current circuit and a ground side constant current circuit. By controlling the operation of the power supply side constant current circuit and the ground side constant current circuit with a control circuit, the control circuit switches the switch circuit on and off to prevent a voltage drop due to an electric current that turns on the switch circuit.

Description

technical field [0001] The present invention generally relates to a voltage measurement device that detects potentials of a plurality of voltage measurement points by using a voltage measurement circuit. Background technique [0002] Conventionally, an assembled battery having a plurality of dry cells coupled in series may have a switching circuit for potential measurement of each of the plurality of dry cells by using a single voltage measurement circuit. That is, a switch circuit having a metal oxide semiconductor field effect transistor (MOSFET) switches the connection between the voltage measurement circuit and each dry cell terminal of the plurality of dry cells. According to Japanese Patent Document 2006-53120 (JP'120) and Japanese Patent 4,450,817 (JP'817), in order to realize normal operation of the switching circuit even when the measured voltage is higher than the gate-source withstand voltage of the MOSFET, the switch The circuit is configured with two MOSFETs co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/3658G01R19/16542G01R31/396
Inventor 早川贵仁
Owner DENSO CORP
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