Control for voltage/current source with current/voltage limiting

Details Control for voltage/current source with current/voltage limiting Control for voltage/current source with current/voltage limiting

1990-05-22

1991-08-13

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

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

323276, 323277, 323285, 361 79, G05F 1569

Patent

active

050399349

ABSTRACT:
An apparatus capable of acting as a current-limited voltage source or a voltage-limited current source is disclosed. The output of the apparatus is provided by a differential amplifier. The current and voltage outputs are compared to positive and negative current and voltage limits. Depending on whether the apparatus is in the voltage mode or the current mode, the inverting input of the differential amplifier is clamped to the appropriate voltage or current comparison signal, respectively, to provide an error signal to the differential amplifier. This clamping is current limited so that if the output current limits are exceeded while in the voltage source mode, a clamp to one of the current comparison signals occurs and dominates the voltage clamp. Similarly, if the output voltage limits are exceeded while in the current source mode, a clamp to one of the voltage comparison signals occurs and dominates the current clamp. To enable a voltage or current source limit to be set at zero, the opposite polarity limit is offset slightly to avoid contention should it also be set near zero.

REFERENCES:
patent: 3697862 (1972-10-01), Taylor
patent: 4004155 (1977-01-01), Nercessian
patent: 4012685 (1977-03-01), Nercessian
patent: 4268790 (1981-05-01), Nercessian
patent: 4599556 (1986-07-01), Lanz
patent: 4618813 (1986-10-01), Vesce et al.
patent: 4684876 (1987-08-01), Creel

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