| 摘要 |
A horizontal deflection circuit includes a first retrace capacitance (C1) and a second retrace capacitance (C2). A horizontal deflection winding (Ly) is coupled to the first and second retrace capacitances to form a resonant circuit, during retrace. A first switching transistor (Q1) responsive to a first control signal (HOR. DRIVE) at a horizontal deflection frequency (fH) selected from a range of horizontal deflection frequencies and coupled to the first retrace capacitance generates a first retrace pulse voltage (V1) in the first retrace capacitance. A second switching transistor (Q2) responsive to a second control signal (OUTPUT OF Q8) is coupled to the second retrace capacitance. A second retrace pulse voltage (V2) is generated in the second retrace capacitance. The second retrace pulse voltage is combined with the first retrace pulse voltage to produce a deflection current (iy) in the deflection winding. A controllable phase shifter (58) responsive to a feedback signal (iQ4) indi cative of a magnitude of a supply current (Is) generates the second control signal at a controllable phase with respect to the first control signal to regulate the deflection current amplitude at each of the selected frequencies by retrace capacitance transformation.
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