Voltage-step-down circuit with chopping transistor for D-C power

Details Voltage-step-down circuit with chopping transistor for D-C power Voltage-step-down circuit with chopping transistor for D-C power

1980-03-19

1982-09-21

Beha, Jr., William H.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323290, G05F 156

Patent

active

043509487

ABSTRACT:
A circuit for reducing the voltage of a d-c power supply with one grounded terminal comprises a chopping transistor in an ungrounded supply lead, periodically turned on and off by an electronic switch, and an L/C network downstream of that transistor along with a flywheel diode. The switch lies in series with an ancillary voltage generator, having a terminal voltage substantially lower than the supply voltage, in a grounded loop which is reactively coupled to the transistor base via a capacitor or a transformer. A control signal for opening and closing the switch may be obtained from a square-wave generator connected across the transistor output and driven by the stepped-down supply voltage.

REFERENCES:
patent: 3781653 (1973-12-01), Marini
patent: 3805094 (1974-04-01), Orlando
patent: 3818318 (1974-06-01), Schott et al.
patent: 4030024 (1977-06-01), Chambers et al.

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