Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1988-11-01
1989-09-12
Peng, John K.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
315411, H06N 563
Patent
active
048665258
ABSTRACT:
An SCR switch of a switch mode power supply is coupled between an unregulated supply voltage and a filter capacitor. A regulator oscillator generates trigger pulses for controlling a switching operation of the SCR switch of the power supply to produce an output supply voltage that energizes a deflection circuit. The regulator oscillator produces trigger pulses that are applied to the SCR switch during both power-up and power-off operation. A resistor coupled between the unregulated supply voltage and the filter capacitor maintains the filter capacitor charged during power-off operation to prevent the trigger pulses from causing the latching operation in the SCR switch throughout the power-off operation. In this way, an audible parasitic vibration sound is not being generated by the power supply during the power-off operation.
REFERENCES:
patent: Re29885 (1979-01-01), Dietz
patent: 4147964 (1979-04-01), Luz et al.
patent: 4232254 (1980-11-01), Haferl
patent: 4321514 (1982-03-01), Thibodeau et al.
patent: 4651214 (1987-03-01), Rodriguez-Cavazos
patent: 4812719 (1989-03-01), Stephens et al.
Television service data manual for CTC 85 chassis series entitled, "Chassis CTC 85 Series," dated 1977, published by RCA Corporation Consumer Electronics Technical Publications Department.
Henig Sammy S.
Rodriguez-Cavazos Enrique
Smith Lawrence E.
Wetta Steven C.
Henig Sammy S.
Laks Joseph J.
Peng John K.
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
LandOfFree
Television apparatus power supply does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Television apparatus power supply, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Television apparatus power supply will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-921099