Importance

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Abstract

An RF drive network provides RF drive power to a device such as an ion deposition print cartridge synchronized with the natural resonance of the driver/device system. A voltage to current amplifier is fed by a power one-shot which triggers on a zero crossing feedback signal from the drive line, resulting in precise drive pulse synchronization and controlled drive power. A second feedback signal biases the amplifier to achieve uniformity in drive voltage and timing despite variations in component characteristics. A fault detector is connected to plural drive lines, and upon detection of an open line condition inhibits the drivers for all lines. A resonance shifting circuit shifts the resonance of each driver in its off state to damp oscillations and eliminate crosstalk between drivers. Preferred constructions drive ion deposition print cartridges for a selectable number of pulses for a desired charged distribution on a print drum, so as to achieve selective toner deposition and vary the print dot size or color.

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First Claim