| 摘要 |
1. A blocking oscillator type converter with a main circuit formed by the series combination of a switching transistor (T1) and the primary winding (Wp) of a transformer, where a control current for the switching transistor (T1) is produced in a feedback winding (Wr) of the transformer, and with an evaluator (T2) which is inserted in parallel to the feedback winding (Wr) of the transformer for a.c., and which interrupts the current flow in the main circuit (T1, Wp), when it responds, characterised in that in order to construct the blocking oscillator type converter so as to be resistant to short circuits (RS), the evaluator (T2) is connected to, a delay circuit (VS) in such manner that on the occurence of an abnormally short current pulse in the main circuit the evaluator (T2) responds and during a delay time of a predetermined duration (T4) interrupts the current flow in the main circuit (T1, Wp). |
