| 摘要 |
In order to be able to operate a voltage converter as a standby power generator without control elements, said converter must be equipped with an automatic switch which consumes so little current on no-load that the complete converter-switch system can remain continuously connected to the power source. For this purpose, a generator supplies needle pulses which are induced in the output circuit by the power transformer of the converter and are always transmitted from there via a control transformer into a switching stage, when a load is connected. The switching stage causes the control part of the converter to switch on and bridges over the separation between the needle pulses during the cutting-off delay. In order to make the power transformer suitable for the transmission of needle pulses, its core must be demagnetised during the cutting-off process. If it is undesirable to have needle pulses in the output voltage, the amplitude of the needle pulses can be reduced in the pulse generator while the converter is switched on.
|
