Patent ID: 6114817
Filing Date: 2000-09-05
Classification: G09G,H04N

Abstract:
A video display deflection apparatus capable of selectively operating at a deflection frequency selected from a range of frequencies, comprising:a source of a synchronization signal at a frequency indicative of said selected frequency;a deflection circuit output stage responsive to said synchronization signal for generating a deflection current at said selected deflection frequency;a first power supply including a first power transistor for generating a first supply voltage by the operation of said first power transistor when a first deflection frequency is selected;a second power supply including a second power transistor for generating a second supply voltage by the operation of said second power transistor when a second deflection frequency is selected; anda source of a signal indicative of said frequency of said synchronization signal for generating a first control signal that is coupled to one of said first and second power supplies for selecting, in accordance therewith, said first supply voltage to energize said deflection circuit output stage, when said first deflection frequency is selected, and said second supply voltage, when said second deflection frequency is selected, such that when said first supply voltage energizes said output stage, said second power transistor is outside a supply current path of said output stage, and, when said second supply voltage energizes said output stage, said first power transistor is outside said supply current path of said output stage.