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US 2006/0049774 A1Published application
Peak detecting circuit and discharge lamp lighting device
OwnerTomoyuki Ichikawa, Shinji Ohtainventors
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OwnerTomoyuki Ichikawa, Shinji Ohtainventors
Estimating the term…
A peak detecting circuit 1 comprises an operational amplifier 2, a plurality of transistors 3 and 4 to be operated upon receipt of an output signal, and a holding capacitor 5. The transistors 3 and 4 are used as emitter followers or source followers, and the output signal of the transistor 3 is input to the operational amplifier 2 to obtain a negative feedback and the output signal of the transistor 3 is supplied to the capacitor 5. Moreover, a discharging resistor is provided in parallel with the capacitor 5 to intentionally provide a droop. Consequently, it is possible to follow a variation in the peak of an input signal which is changed momentarily.
A peak detecting circuit comprising an operational amplifier, a plurality of transistors to be operated upon receipt of an output signal, and a holding capacitor,
A discharge lamp lighting device comprising a dc/ac converting unit for carrying out an ac conversion upon receipt of a dc input voltage and a circuit for detecting a lamp voltage or a lamp current which is related to a discharge lamp,
Dependencies are inferred from the claim text.