Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1992-07-02
1993-12-14
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
315411, 358243, H04N 563
Patent
active
052708233
ABSTRACT:
A television receiver has a switched mode power supply for regulating output voltages including the B+ output to a flyback transformer, by generation of output pulses to a power transformer. A controller for the power supply is coupled in two feedback loops, one responsive to a pulse width modulator coupled to the flyback transformer and the other comparing the output voltage with an internal reference for free running operation. The first feedback loop takes precedence and is active in the run mode of the television receiver. In the standby mode when horizontal rate pulses are absent, the second feedback loop takes over. The second feedback loop has a different reference level than the first, such that when switching from the run mode to the standby mode a transition interval occurs in which no pulses are output by the controller, thereby causing the B+ voltage to the flyback transformer to fall. During this transition interval, horizontal scanning signals continue at falling amplitude, and a signal is input to the kinescope drivers, thereby collapsing the picture and draining the ultor voltage on the screen anode. The reoccurrence of controller pulses when the output voltage of the power transformer has fallen to the new lower reference level is used to positively switch operation of the receiver at the conclusion of the transition interval.
REFERENCES:
patent: 4524411 (1985-06-01), Willis
patent: 4737851 (1988-04-01), Shanley, II et al.
patent: 5036261 (1991-07-01), Testin
patent: 5093605 (1992-03-01), Meinertz
Heidebroek Wolfgang
Wu Chun H.
Groody James J.
Laks Joseph J.
Miller John W.
Sragow Daniel E.
Thomson Consumer Electronics S.A.
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