Transformer power supply for remote controlled receivers with provision for fast warm-up |
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| 申请号 | US3573629D | 申请日 | 1969-04-01 | 公开(公告)号 | US3573629A | 公开(公告)日 | 1971-04-06 |
| 申请人 | GEN ELECTRIC; | 发明人 | BUELL DONALD F; | ||||
| 摘要 | A transformer power supply for a remote controlled receiver provides reduced filament power in the OFF condition by increasing the primary to secondary turns ratio for the filament supply winding when the receiver is turned OFF. At the same time, the number of turns in the secondary winding supplying the remote control circuits is increased in the same ratio as the increase in the primary turns so as to maintain a constant operating voltage to the remote control circuits, thus enabling the receiver to be turned ON remotely. Switching of the turns in the various windings is provided by a relay connected across the lowvoltage portion of the remote control supply winding. | ||||||
| 权利要求 | 1. A transformer type of power supply for remote controlled receivers having remote control circuit means to which normal operating voltage must be supplied when the receiver is in the OFF condition so that it can be turned ON remotely, an also having vacuum tube means with heater filaments to which reduced power is supplied during the OFF conDition to provide fast warmup when the receiver is turned ON, said power supply comprising: means for supplying an AC line voltage; a power transformer including a primary winding coupled to the line voltage supply means and including a plurality of secondary supply windings respectively coupled to said filament means, and said remote control circuit means, the primary winding and remote control supply winding each having two sets of turns corresponding respectively to the ON and OFF conditions of the receiver, the turns ratios between associated winding sets being approximately the same or both conditions; an ON/OFF switch; and control means coupled in circuit with a secondary winding of the transformer and with the ON/OFF switch, said control means being responsive to turning OFF the ON/OFF switch for increasing the turns in the primary winding thus increasing the turns ratio between the primary and filament supply windings so as to reduce the filament power, and for correspondingly increasing the turns in the remote control supply winding thus maintaining full operating voltage to the remote control circuits. 2. A transformer type of power supply according to claim 1 in which the receiver includes a DC supply means, the transformer includes a secondary supply winding adapted to be coupled to the DC supply means and the control means includes switch means for disabling the coupling of said supply winding to the DC supply means when the receiver is turned OFF and for enabling the coupling when the receiver is turned ON. 3. A transformer type of power supply according to claim 1 in which the control means includes a relay winding coupled across that set of the remote control supply winding having the lesser number of turns. 4. A transformer type of power supply according to claim 3 in which the transformer primary winding includes remote end terminals and an intermediate terminal respectively defining said two sets of turns of the primary winding, one of the remote end terminals being adapted to be coupled to the AC line voltage supply means in the OFF condition and the intermediate terminal adapted to be coupled to the AC line voltage supply means in the ON condition and in which the control means includes a relay switch connected between the one end terminal and intermediate terminal and the line voltage supply means, the relay switch being activated by the rely winding to alternatively couple said terminals to the AC line voltage supply means. 5. A transformer type of power supply according to claim 1 in which the control means includes a relay winding connected in series circuit with the ON/OFF switch and that set of the remote control supply winding having the lesser number of turns, the voltage across said lesser number of turns being sufficient to fully energize the relay winding during the ON condition but only to partially energize it in the OFF condition; said control means further including a relay switch connected between the AC line voltage supply means and the two sets of turns of the primary winding and being responsive to said relay winding when the ON/OFF switch is turned ON to interrupt momentarily the power applied to the primary winding as the relay switch changes the AC line voltage over from one set of turns in the primary winding to the other thus producing a pulse of current though the relay winding sufficient to cause the relay winding to become momentarily fully energized long enough to complete the changeover of AC line voltage, thereupon providing full voltage across the relay winding to hold said relay switch in the ON condition. |
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