Method and circuit arrangement for monitoring the mode of operation of one or more load circuits, especially of a domestic appliance
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United States of America Patent
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Mar 4, 2008
Grant Date -
Aug 17, 2006
app pub date -
Jul 14, 2004
filing date -
Aug 8, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a method and a circuit arrangement for monitoring the mode of operation of one or more load circuits, especially of a domestic appliance, which contains a controlled semiconductor switch, such as a triac, and an electric consumer. Said switches are supplied by at least one alternating voltage source that supplies an alternating voltage including positive and negative voltage half-waves. The invention is characterized in that the currents flowing through all controlled semiconductor switches (T1, T2) and the electric consumers (R1, R2) are guided through a common low-impedance precision resistor (Rm). The respective voltage drop occurring over the low-impedance precision resistor (Rm) is separately evaluated with respect to the amplitudes of the positive and negative voltage half-waves.
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