Method to determine current detection circuit failure
AssigneeSanyo Electric Co., Ltd.
InventorKimihiko Furukawa
Life of this patent
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Abstract
A method of determining current detection circuit failure determines failure of a current detection circuit that is connected to positive and negative sides of a power source and that issues a voltage corresponding to detected current at an output terminal. The method of determining failure cuts-off either one of the current detection circuit connections to the positive and negative sides of the power source, detects output voltage from the output terminal, and determines proper operation or failure of the current detection circuit.
Claims20
A method of determining current detection circuit failure of a current detection circuit that is connected to a positive side and a negative side of a power source, the current detection circuit being operable to issue a voltage corresponding to a detected current at an output terminal, the method comprising:
- cutting off the positive-side of the power source so that the current detection circuit is supplied only by the negative-side of the power source;
- and
- comparing output voltage issued from the output terminal of the current detection circuit to a reference voltage, wherein the current detection circuit is determined to be operating properly if the output terminal voltage is more negative than the reference voltage, and current detection circuit failure is determined when the output terminal voltage is the reference voltage or within a specified voltage range.
A method of determining current detection circuit failure of a current detection circuit that is connected to a positive side and a negative side of a power source, the current detection circuit being operable to issue a voltage corresponding to a detected current at an output terminal, the method comprising:
- cutting off the negative-side of the power source so that the current detection circuit is supplied only by the positive-side of the power source;
- and
- comparing the output voltage issued from the output terminal of the current detection circuit to a reference voltage, wherein the current detection circuit is determined to be operating properly if the output terminal voltage is more positive than the reference voltage, and current detection circuit failure is determined when the output terminal voltage is the reference voltage or within a specified voltage range.
A method of determining current detection circuit failure of a current detection circuit that is connected to a positive side and a negative side of a power source, the current detection circuit being operable to issue a voltage corresponding to a detected current at an output terminal, the method comprising:
- switching the current detection circuit from a connection to the positive side and the negative side of the power source to a state in which the positive-side power connection is cut-off, and supplying the current detection circuit only with current from the negative side of the power source;
- and
- detecting a change in the output voltage issued from the output terminal of the current detection circuit, wherein the current detection circuit is determined to be operating properly when the output voltage shifts negative.
A method of determining current detection circuit failure of a current detection circuit that is connected to a positive side and a negative side of a power source, the current detection circuit being operable to issue a voltage corresponding to a detected current at an output terminal, the method comprising:
- switching the connection of the current detection circuit from the positive and negative sides of the power source to a state in which the negative-side power source connection is cut-off, and supplying the current detection circuit with only current from the positive-side of the power source;
- and
- detecting a change in the output voltage issued from the output terminal of the current detection circuit, wherein the current detection circuit is determined to be operating properly when output voltage shifts positive.
Dependencies are inferred from the claim text.