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US 9,069,024 B2Granted
Insulation resistance measurement circuit having self-test function without generating leakage current
AssigneeSK Innovation Co., Ltd.
InventorJeong Hwan Yang
Life of this patent
Estimating the term…
Abstract
An insulation resistance measurement circuit in which switching of first and second switches is controlled such that a leakage current may not be generated in measuring insulation resistance, and voltages output through first and second operational amplifiers are measured after opening the first and second switches and closing third and fourth switches for self-testing of the insulation resistance measurement circuit.
Claims18
An insulation resistance measurement circuit comprising:
- a source resistance unit including a first source resistance unit connected to a positive terminal of an insulation resistance measurement battery and a second source resistance unit, and the second source resistance unit connected to a negative terminal of the insulation resistance measurement battery and the first source resistance unit;
- a voltage sensing unit including a first operational amplifier sensing a voltage of the first source resistance unit, as a first voltage, and a second operational amplifier sensing a voltage of the second source resistance unit, as a second voltage;
- a leakage current interrupting unit including a first switch connected to the positive terminal of the insulation resistance measurement battery and the first source resistance unit and a second switch connected to the negative terminal of the insulation resistance measurement battery and the second source resistance unit;
- a measurement circuit testing unit including a third switch connected to the first operational amplifier and a first voltage source, and a fourth switch connected to the second operational amplifier and a second voltage source;
- and
- an insulation resistance measurement unit measuring insulation resistance of the insulation resistance measurement battery through the first and second voltages,
- wherein the measurement circuit testing unit opens the first and second switches and closes the third and fourth switches, and measures the first and second voltages to determine whether or not the first and second operational amplifiers have an error, thereby enabling self-testing.
4 more elements
A control insulation resistance measurement circuit comprising:
- a source resistance unit including a first source resistance unit connected to a positive terminal of an insulation resistance measurement battery and a second source resistance unit, and the second source resistance unit connected to a negative terminal of the insulation resistance measurement battery and the first source resistance unit;
- a voltage sensing unit including a first operational amplifier sensing a voltage of the first source resistance unit, as a first voltage, and a second operational amplifier sensing a voltage of the second source resistance unit, as a second voltage;
- a leakage current interrupting unit including a first switch connected to the positive terminal of the insulation resistance measurement battery and the first source resistance unit and a second switch connected to the negative terminal of the insulation resistance measurement battery and the second source resistance unit;
- a measurement circuit testing unit including a third switch connected to the first operational amplifier and a first voltage source, and a fourth switch connected to the second operational amplifier and a second voltage source;
- an insulation resistance measurement unit measuring insulation resistance of the insulation resistance measurement battery through the first and second voltages;
- and
- a controller configured to:
- open the first and second switches;
- close the third and fourth switches;
- measure the first and second voltages;
- and
- determine that the first and second operational amplifiers have an error in response to determining that values of the first and second voltages are not within a threshold voltage difference from zero volt.
9 more elements
A method of testing an insulation resistance measurement circuit that comprises:
- a source resistance unit including a first source resistance unit connected to a positive terminal of an insulation resistance measurement battery and a second source resistance unit, and the second source resistance unit connected to a negative terminal of the insulation resistance measurement battery and the first source resistance unit;
- a voltage sensing unit including a first operational amplifier sensing a voltage of the first source resistance unit, as a first voltage, and a second operational amplifier sensing a voltage of the second source resistance unit, as a second voltage;
- a leakage current interrupting unit including a first switch connected to the positive terminal of the insulation resistance measurement battery and the first source resistance unit and a second switch connected to the negative terminal of the insulation resistance measurement battery and the second source resistance unit;
- a measurement circuit testing unit including a third switch connected to the first operational amplifier and a first voltage source, and a fourth switch connected to the second operational amplifier and a second voltage source;
- and
- an insulation resistance measurement unit measuring insulation resistance of the insulation resistance measurement battery through the first and second voltages,
- the method comprising:
- opening the first and second switches;
- closing the third and fourth switches;
- measuring the first and second voltages;
- and
- determining that the first and second operational amplifiers have an error in response to determining that values of the first and second voltages are not within a threshold voltage difference from zero volt.
9 more elements
Dependencies are inferred from the claim text.