H - Electricity – 03 – K
Patent
H - Electricity
03
K
H03K 19/0175 (2006.01) H03K 17/61 (2006.01) H03K 17/691 (2006.01)
Patent
CA 2110794
A transformer isolates a control circuit from a FET, the control circuit including a clock generator for providing, when en- abled, a clock signal to the transformer primary. A PWM input selectively disables the clock generator from providing the clock signal to the transformer primary. The transformer secondary is connected in a full wave centertap configuration for providing a full wave rectified version of the clock signal, the full wave rectified version being a relatively constant DC voltage signal suppli- ed at one level to the FET to turn on the FET when the clock generator is enabled to provide the clock signal to the primary. The centertap configuration provides a relatively constant DC voltage signal at a second level to the FET to turn off the FET when the clock generator is disabled by the PWM input from providing the clock signal to the primary.
Roberts Walter O.
Salerno David C.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
United Technologies Corporation
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