Device for transforming a primary AC voltage in a lower AC...

Details Device for transforming a primary AC voltage in a lower AC... Device for transforming a primary AC voltage in a lower AC...

2011-07-05

2011-07-05

Berhane, Adolf (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Phase controlled switching using electronic tube or a three...

C323S324000

Reexamination Certificate

active

07973519

ABSTRACT:
A device for transforming an AC voltage to a lower AC voltage includes a generator of a PWM control signal and a first bidirectional switch to couple a load to the AC voltage during a conduction-phase. A second bidirectional switch discharges energy from the load during an off-phase of the first bidirectional switch. A first driving circuit of the first bidirectional switch is input with the PWM control signal and generates a first PWM signal, applied between control and conduction terminals of the first bidirectional switch. A second driving circuit for the second bidirectional switch is input with the PWM control signal and generates a second PWM signal, in phase opposition to the first PWM signal, applied between control and conduction terminals of the second bidirectional switch. An electric decoupling circuit is between the generator and second driving circuit. A transformer is between respective conduction terminals of the bidirectional switches.

REFERENCES:
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patent: 7288904 (2007-10-01), Numeroli et al.
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patent: 7696730 (2010-04-01), Tamai et al.
patent: 7786709 (2010-08-01), Lawson et al.
patent: 7816814 (2010-10-01), Hennessy et al.

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