Self-biased scorotron grid power supply and electrostatic voltme

Details Self-biased scorotron grid power supply and electrostatic voltme Self-biased scorotron grid power supply and electrostatic voltme

1988-05-18

1989-09-19

Salce, Patrick R.

Electricity: power supply or regulation systems

In shunt with source or load

Using diode

361212, 361230, 361235, 250324, G05F 1652

Patent

active

048689076

ABSTRACT:
An electrophotographic system including a corona charging device for applying a charge to a surface and having a coronode driven to a corona producing condition; a conductive grid interposed between the surface to be charged and the coronode; the conductive grid having a self-biasing arrangement to control the voltage thereon produced by corona current from the coronode, the self-biasing arrangement including a current sinking device between the conductive grid and a common; and a power supplying takeoff, electrically connected between the conductive grid and the current sinking device, and having a voltage thereat controlled by the current sinking device. An electrostatic voltmeter drivable by such an arrangement includes a probe for detecting voltage on a surface and producing a representative voltage signal; a low current, high voltage supply such as that available at the conductive grid; a constant current source; a current sinking device connected to the constant current source and having a constant voltage drop thereacross, and providing first and second floating voltages and a relative common therebetween; and a voltage controller variably controlling the voltage level at the current sinking device in response to the representative voltage signal; a signal processing device for conditioning the representative voltage signal for variably controlling the voltage controller; the amplifier driven by the first and second floating voltages.

REFERENCES:
patent: 3370212 (1968-02-01), Frank
patent: 3769506 (1973-10-01), Silverberg
patent: 3921042 (1975-11-01), Shenoy
patent: 4233511 (1980-11-01), Harada et al.
patent: 4433298 (1984-02-01), Palm
patent: 4603964 (1986-08-01), Swistak
patent: 4618249 (1986-10-01), Minor
patent: 4638397 (1987-01-01), Foley
patent: 4695723 (1987-09-01), Minor
patent: 4714978 (1987-12-01), Coleman
patent: 4725732 (1988-02-01), Lang et al.

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