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
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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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