Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With coupling means
Reexamination Certificate
2007-11-06
2007-11-06
Karlsen, Ernest (Department: 2829)
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With coupling means
C338S049000
Reexamination Certificate
active
10921915
ABSTRACT:
A mounting structure for current detection resistor device has a feature that voltage detection terminal wiring is configured so as to extend along a current path in the resistor body first, and then, to bend at right angles to the current path, while maintaining electrical isolation from a resistor body of the current detection resistor device. The voltage detection terminal wiring connecting to the voltage detection terminals on the circuit board is disposed to extend for some distance in the same direction as the current path so as to cause mutual-inductance between that section of the voltage detection terminal wiring and the resistor body. This causes cancellation of induced voltage caused by the self-inductance of the resistor body, so that it is possible to nullify detection error generated by the voltage induced by the resistor body from the viewpoint of the measuring system. Therefore, it is possible to detect a large current with good accuracy that may flow in a device such as a current detection resistor device for a switching power source operating at high frequencies. A method is provided for measuring a value of effective inductance that includes the steps of: supplying a flow of current to be measured having a saw-teeth waveform through a resistor device to simulate the actual use; detecting a flow of current and detecting a voltage produced by the flow of the current; and computing an effective inductance value from a variation in the flow of saw-teeth waveform current and a corresponding variation in the voltage.
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Karlsen Ernest
KOA Corporation
Westerman, Hattori, Daniels & Adrian , LLP.
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