Switched-mode power supply for a television receiver provided with a stand-by system
AssigneeU. S. Philips Corporation
InventorAlain Decraemer
Life of this patent
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Abstract
Television receiver including a switched-mode power supply which is regulated and capable of functioning both in self-oscillating mode and under the control of a line frequency synchronization. During normal operation there is synchronization, and the line time base supplies most of the supply voltages to the circuits of the receiver. To change to the stand-by state the drive of the line transistor is stopped, which stops most of the circuits depending thereon. The switched-mode power supply continues to function but then in the self-oscillating mode, and supplies the stand-by device via a secondary winding of its storage inductor.
Claims8
A television receiver provided with a stand-by device, comprising a switched-mode power supply with a storage inductor and a switching device for supplying first user circuits, a power stage for the line deflection, having a switching element and a line transformer which is supplied by the switched-mode power supply, second user circuits being supplied via secondary windings of the line transformer, the stand-by state being obtained by stopping the line deflection, characterized in that the stand-by device is also supplied by the switched-mode power supply, the latter including self-oscillating and regulating means to ensure that when the line deflection is stopped the switched-mode power supply continues to supply the same voltage to the stand-by device.
Dependencies are inferred from the claim text.