Microprocessor controlled constant current circuit

Details Microprocessor controlled constant current circuit Microprocessor controlled constant current circuit

1985-12-20

1986-12-30

Beha, Jr., William H.

Electricity: power supply or regulation systems

Self-regulating

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

340347DA, G05F 324

Patent

active

046331646

ABSTRACT:
Apparatus for generating a constant current, comprising a storage device for storing a voltage corresponding to the constant current, the storage device including a resistor-capacitor filter and having an input and an output; a Zener diode for supplying a constant voltage; a first high off-state impedance device for connecting the Zener diode to the input in response to a first actuation signal; a second high off-state impedance device for connecting the input to a source of discharge potential in response to a second actuation signal; a microprocessor for supplying the first actuation signal to the first high off-state impedance device for a first time interval and the second actuation signal to the second off-state impedance device thereafter for a second time interval, and then providing no first and second actuation signals for a third time interval much greater than the combined first and second time intervals; and a voltage-to-current converting circuit connected to the output and having a high input impedance, for converting the voltage stored in the storage device to the constant current.

REFERENCES:
patent: 3258765 (1966-06-01), Battjes
patent: 3512000 (1970-05-01), Powell
patent: 3867641 (1975-02-01), Collins
patent: 4547762 (1985-10-01), Ono

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