| 摘要 |
A power supply designed primarily for polychrome cathode-ray tubes of the penetration type and capable of switchover to three and/or four levels comprises a main high-voltage source and one or more auxiliary sources having lower rated voltage values, the auxiliary source or sources being combined with the main source by means of a set of switches according to the total value of voltage to be applied to the polychrome cathode-ray tube in order to obtain a predetermined color. A circuit for recovering the switching energy is associated with the four-level supply system.
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