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US 4,009,091 AGranted
Skipping sine wave pulse plater system
AssigneeInstrumentation & Control Systems, Inc.
InventorsHarold Washington, Martin Kozi
Life of this patent
Estimating the term…
Abstract
A pulse plating system wherein the duty cycle is controlled by skipping pulses in producing the output signal. The circuitry for controlling the skipping of the pulses can either be analog or digital type circuitry.
Claims10
A skipping sine wave pulse plating system for providing power from an alternating current source to electrodes in an electro-plating bath,
- said system comprising voltage control means for controlling the amplitude of the power provided to said electrodes,
- duty cycle control means for controlling the duty cycle of the power applied to said electrodes by conducting only during prescribed phases of said alternating current,
- means for connecting said duty cycle control means to said electrodes,
- power sensing means in said connecting means for determining the power provided to said electrodes,
- drive circuit means for controlling said duty cycle control means,
- phase comparator means associated with said drive circuit means for setting said duty cycle by controlling the prescribed phases,
- drive circuit control means operated responsive to said power sensing means for controlling said drive circuit means to maintain the duty cycle as set, and
- squelching means for controlling the output of said drive circuit means to enable reducing the duty cycle to a condition of less than 25 percent while still maintaining a constant output amplitude.
5 more elements
A skipping sine wave pulse plating system for providing pulse power from an alternating current source to electrodes in an electro-plating bath,
- said system comprising means for monitoring the output of said system,
- phase regulator means for determining the pulse width of the pulses emitted from said system,
- first feedback means for controlling the phase of said pulses relative to said input alternating current,
- second feedback means for controlling the amplitude of said pulses, and
- third feedback means for controlling the number of pulses per period to thereby provide completely controlled output pulses with regard to phase, amplitude and duty cycle.
2 more elements
Dependencies are inferred from the claim text.