Electric current measurement apparatus, voltage measurement apparatus and power supply apparatus
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United States of America Patent
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Sep 27, 2011
Grant Date -
Sep 24, 2009
app pub date -
Mar 12, 2009
filing date -
Mar 19, 2008
priority date (Note) -
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Abstract
An electric current measurement apparatus for measuring an electric current of each electrode of an electron tube includes a transformer, a detection resistor connected in an ampere meter route for measurement, a voltage detection unit for detecting electric potential difference of the detection resistor and outputting pulse signals corresponding to the detected electric potential difference, a switching part for providing a short circuit of the secondary winding according to the pulse signals, and a measurement current value output unit. The measurement current value output unit measures pulse attribute of pulse-shape signals which are induced on the primary winding of the transformer caused by the short circuit of the secondary winding, and outputs a value of electric current flowing through the detection resistor with referring to a predetermined relationship between a value of the electric current flowing through the detection resistor and the pulse signals generated in the voltage detection unit.
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