Switching regulator for television receiver for generating a stabilized D.C. supply voltage for operating the various TV circuits
AssigneeHitachi, Ltd.
InventorKunio Umehara
Life of this patent
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Abstract
A switching regulator for a television receiver, wherein a non-stable dc voltage is periodically interrupted at the horizontal frequency by a chopper and the dc voltage obtained as the output of the chopper is applied to the horizontal output circuit. Flyback pulses generated by the horizontal output circuit are integrated to generate a saw-tooth waveform, and the dc component of the saw-tooth waveform is varied in accordance with the variation of the dc voltage delivered by the chopper. The duty ratio of the chopper is changed according to the variation of the dc component of the saw-tooth waveform.
Claims9
A switching regulator for use in a television receiver, comprising:
- (a) a d.c. power source for generating a non-stabilized d.c. voltage;
- (b) chopper means including a switching element, said chopper means being operatively turned on and off alternately for periodically interrupting said non-stabilized d.c. voltage in accordance with the turn-on and turn-off of said switching element to produce an interrupted voltage;
- (c) rectifying means for converting the interrupted voltage from said chopper means into a d.c. output voltage;
- (d) a horizontal deflection circuit supplied as an operating voltage therefor with said d.c. output voltage for operatively generating a horizontal flyback pulse;
- (e) first control means supplied with said horizontal flyback pulse for generating a first control signal corresponding to the horizontal deflection frequency of said horizontal flyback pulse, and for preventing said first control signal from being generated when the supply of said horizontal flyback pulse is stopped;
- and
- (f) second control means for rendering said switching element on and off at said horizontal deflection frequency of said first control signal during the supply of said first control signal thereto and for holding said switching element inoperative during the stop of said first signal, said second control means including means supplied with said d.c. output voltage for generating a second control signal for operatively increasing or decreasing the on period of said switching element in accordance with the decrease or increase in level of said d.c. output voltage.
A switching regulator for use in a television receiver, comprising:
- (a) a source for generating a non-stabilized d.c. voltage;
- (b) a chopper comprising a transformer and a switching element connected in series with a primary winding of said transformer and with said source, a voltage being induced across a secondary winding of said transformer in response to the change to the conduction state and change to the cut-off state of said switching element;
- (c) rectifying means for reconverting the voltage induced across the secondary winding of said transformer into a d.c. output voltage;
- (d) a horizontal deflection circuit including a horizontal output circuit and connected with said rectifying means;
- (e) detection means supplied with said d.c. output voltage from said rectifying means for generating a detection signal responsive to a level of said d.c. output voltage;
- and
- (f) control means for causing said switching element to change from its conduction to cut-off state within a horizontal flyback period in accordance with the receipt of a horizontal flyback pulse from said horizontal output circuit and for causing said switching element to change from its cut-off to conduction state within the horizontal scanning period in accordance with said detection signal, the changing time period from the cut-off state to the conduction state of said switching element lagging or leading in accordance with said increase or decrease in said d.c. output voltage.
Dependencies are inferred from the claim text.