Switching boosting circuit having internally controlled duty
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United States of America Patent
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-
Apr 18, 1995
Grant Date -
N/A
app pub date -
Sep 22, 1993
filing date -
Oct 1, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A switching boosting circuit including a clock oscillating circuit having a Schmitt trigger inverter, a boosted-voltage inducing circuit which is actuated in a switching-operation mode in response to the output clock of the clock oscillating circuit to induce a boosted voltage, a capacitor which is charged by the boosted voltage from the boosted-voltage inducing circuit to store energy to be supplied to a load, and a feedback path for feeding back current whose intensity corresponds to the load from the capacitor to the clock oscillating circuit. The feedback current acts such that the duty ratio of the switching operation is set to be smaller than a predetermined reference duty ratio, and the feedback path includes a Zener diode for reducing the boosted voltage below a predetermined value.
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