| 摘要 |
A first winding (30a) of an input transformer (30) of a deflection generator (48) is coupled to a source (21) of supply frequency alternating polarity voltage and to a regulator switch (75). A second winding (30b) is coupled to the deflection generator. A regulator control circuit (58) turns on the regulator switch (75) at a controlled instant within a first polarity interval of the deflection rate alternating polarity voltage. The deflection rate alternating polarity voltage applied to the second winding (30b) is reflected to the first winding (30a) and commutates off the regulator switch (75) during the alternate polarity interval of each deflection cycle. A signal (79) representative of variations in a deflection circuit energy level varies the conduction time of the switch (75) to regulate the energy level. A second controllabel switch (27) is coupled in the series path of the input current from the source (21) of supply frequency alternating polarity voltage and is controled by a second control circuit (59). |
