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US 7,924,016 B2Granted
Voltage measuring device
AssigneeYazaki Corporation
InventorHidehiko Shimizu
Life of this patent
Estimating the term…
Abstract
A pair of measuring switches S21, S22 is interposed between both terminals of a capacitor C, and inputs T1, T2 of A/D converters 11c, 11d via resistors R1, R2. A pair of measuring switches S23, S24 is interposed between both inputs T1, T2 and a ground. The CPU 12a controls the measuring switches S21 to S24 so that when a terminal “a” of the capacitor C is positive charged, while the other terminal “b” of the capacitor C is grounded, both terminals “a” and “b” are respectively connected to the inputs T1 and T2. The CPU 12a controls the measuring switches S21 to S24 so that when the terminal “b” of the capacitor C is positive charged, while the terminal “a” of the capacitor C is grounded, both terminals “a” and “b” are respectively connected to the inputs T1 and T2.
Claims7
A voltage measuring device comprising:
- a capacitor sequentially connected to a plurality of unit cells connected in series, and charged in positive and negative polarities depending on the unit cells;
- a voltage measuring unit for measuring a voltage across the capacitor, said voltage measuring unit having a first and a second input terminal, wherein a differential voltage between the first and the second input terminals determines a voltage across the capacitor;
- a pair of first switches, each switch having a controllable connecting means for either connecting or not connecting a first terminal and a second terminal of the switch, wherein, when the connecting means is not connecting, the first terminals of the first switches are respectively connected to first and second terminals of the capacitor and the second terminals of the first switches are respectively connected to the first and second input terminals of the voltage measuring unit;
- a pair of second switches, each switch having a controllable connecting means for either connecting or not connecting a first terminal and a second terminal of the switch, wherein, when the connecting means is not connecting, the first terminals of the second switches are respectively connected to the first and the second input terminals and the second terminals of the second switches are connected to a ground;
- a first switching controller for controlling the first and second switches so that when a first terminal of the capacitor is positive charged, while a second terminal of the capacitor is grounded, at least the first terminal of the capacitor is connected to one of the input terminals;
- a second switching controller for controlling the first and second switches so that when the second terminal of the capacitor is positive charged, while the first terminal is grounded, at least the second terminal of the capacitor is connected to one of the input terminals.
3 more elements
A voltage measuring device comprising:
- a capacitor sequentially connected to a plurality of unit cells connected in series, and charged in positive and negative polarities depending on the unit cells;
- a voltage measuring unit for measuring a voltage across the capacitor said voltage measuring unit having a first and a second input terminal, wherein a differential voltage between the first and the second input terminals determines a voltage across the capacitor;
- a pair of first switches of which first terminals are respectively connected to first and second terminals of the capacitor and second terminals of the first switches are respectively connected to the first and second input terminals of the voltage measuring unit;
- a pair of second switches of which first terminals are respectively connected to the first and the second input terminals and second terminals of the second switches are connected to a ground;
- a first switching controller for controlling the first and second switches so that when a first terminal of the capacitor is positive charged, while a second terminal of the capacitor is grounded, at least the first terminal of the capacitor is connected to one of the input terminals;
- a second switching controller for controlling the first and second switches so that when the second terminal of the capacitor is positive charged, while the first terminal is grounded, at least the second terminal of the capacitor is connected to one of the input terminals, wherein
- the voltage measuring device further includes a third switching controller for controlling the first and second switches to discharge the capacitor by grounding the both terminals of the capacitor after the voltage measuring unit measures the voltage across the capacitor, and a failure detecting unit for detecting a break in a connector connecting any two of the plurality of unit cells connected in series based on the voltage across the capacitor measured by the voltage measuring unit.
4 more elements
Dependencies are inferred from the claim text.