Voltage measurement apparatus

A technology of voltage measurement and voltage measurement circuit, applied in the direction of measurement device, measurement of electricity, measurement of electric variables, etc., can solve problems such as affecting the measurement results of voltage measurement circuit

Inactive Publication Date: 2014-09-10
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

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no. 1 example

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

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

no. 2 example

[0047] image 3 A second embodiment is shown in, in which components similar to the first embodiment have similar reference numerals, and differences from the first embodiment are described below. In the second embodiment, the switch circuit 25 replaces the switch circuit 7. The switch circuit 27 includes two N-channel MOSFETs 26, 27 arranged to have a common source connection and a common gate connection, so that the N-channel MOSFETs 26, 27 have parasitic diodes 26D, 27D arranged in opposite directions to each other. The gate of each of the N-channel MOSFETs 26, 27 is coupled to the drain of the P-channel MOSFET 14b, and the source of each of the N-channel MOSFETs 26, 27 is coupled to the drain of the 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 element 10, and...

no. 3 example

[0050] Figure 4 A third embodiment is shown in, in which components similar to 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 supply side constant current circuit 31, and the ground side constant current circuit 32 replace the switch circuit 17, the power supply 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 a connection direction opposite to the first embodiment, so that the P-channel MOSFETs 8, 9 share a common drain. In addition, the parasitic diodes 8D, 9D have a common anode connection, so that the diodes 8D, 9D are coupled to each other in opposite directions. The current-carrying parts of the switching circuit 28 are provided as two resistor elements 29, 30. The resistors 29, 30 are coupled between the source and g...

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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 measuring device that detects the electric potential of a plurality of voltage measuring points by using a voltage measuring circuit. Background technique [0002] Conventionally, an assembled battery having a plurality of dry batteries coupled in series may have a switching circuit for electric potential measurement of each of the plurality of dry batteries 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 of the dry battery terminals of the plurality of dry batteries. According to Japanese Patent Document 2006-53120 (JP'120) and Japanese Patent 4,450,817 (JP'817), in order to realize the 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 circ...

Claims

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Application Information

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