| 摘要 |
PURPOSE:To obtain a simple power source for the main transistor inverse bias by adding the DC negative voltage outputted to the load of a DC-DC converter to the pole inversely biased between the base and emitter of the main transistor through the auxiliary transistor directly. CONSTITUTION:The voltage of the DC power source 6 is added to the primary winding 7P of a transistor 7 through the main transistor 3 which is repeatedly switched ON and OFF. The voltage induced to the secondary windings 7S1 and 7S2 of the transformer 7 is rectified and smoothed with diodes 8&9 and condensers 10&11 and supplied to loads 12&13. The voltage obtained by the secondary winding 7S2 of the transformer 7 is added to the pole inversely biased between the base and emitter of the main transistor 3 through an auxiliary transistor 5.
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