Circuit for controlling a series switching element in a clocked

Details Circuit for controlling a series switching element in a clocked Circuit for controlling a series switching element in a clocked

1987-02-12

1988-05-31

Skudy, R. M.

Electricity: power supply or regulation systems

Output level responsive

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

323284, 323351, G05F 144

Patent

active

047483989

ABSTRACT:
A circuit arrangement for the control of the series switching element of a clocked power supply unit has a pulse signal (Vt) delivered by a pulse generator. The pulse-interval ratio of the pulse signal can be varied as a function of a regulating signal (Vc) derived from the output side of the power supply unit and delivered by way of an optoisolator (13). The portion of the circuit employed as pulse generator (1) includes an operational amplifier (10) with feedback at both inputs. One feedback branch of the amplifier (10) contains at the amplifier input a capacitance (15) and a variable resistance. The variable resistance is formed by the parallel connection of a phototransistor (132) of an optoisolator (13) and an ohmic resistor (12). Accordingly, it becomes possible to produce a variation of the pulse-interval ratio of the pulse signal (Vt) either solely by modification of the pulse length or solely by modification of the pulse intervals. One input of the operational amplifier (10) may be connected with a start-stop switching stage (3), which also uses an op-amp ( 20). The two operational amplifiers (10, 20), which both are employed as open collector voltage comparators, can also be made as part of an integrated unit.

REFERENCES:
patent: 4553082 (1985-11-01), Nesler
patent: 4578630 (1986-03-01), Grosch
patent: 4607320 (1986-08-01), Matui et al.
patent: 4642550 (1987-02-01), Illuzzi et al.

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