Voltage controlled and current limited power supply

Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...

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Details

323908, 363 89, G05F 1565, G05F 1573

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active

050417770

ABSTRACT:
A current supply arrangement includes a power transistor (T1) driven by a control transistor (T2). The power transistor switching path is connected between a terminal (UE+) of an unregulated input direct voltage (UE) and a terminal (UA+) of a regulated supply voltage (UA). A first control amplifier (OP1), drives the control transistor via a first electrode (base) thereof and compares a voltage derived from the supply voltage (UA) with a first reference voltage (Uref). A second control amplifier (OP2) compares a measuring voltage (UM) derived at a current measuring resistor (R10) with a second reference voltage. The voltage control and current regulation results in a system having a small number of elements and a sufficient dynamic control range.
The output of the second control amplifier (OP2) is connected to a second electrode emitter of the control transistor so that, the control transistor operates in emitter arrangement during active voltage regulation and operates in base arrangement during active current limitation.

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patent: 4176309 (1979-11-01), Schulz et al.
patent: 4254372 (1981-03-01), Moore, Jr.
patent: 4338646 (1982-07-01), Davis et al.
patent: 4346342 (1982-08-01), Carollo
patent: 4704572 (1987-11-01), Melbert

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