| 摘要 |
A unit (21) consisting of a resistive and capacitive network measures the average value of the voltage (Vaux) at the terminals of the auxiliary winding at the end of its demagnetization period. The units time constant is low before the control pulse period of the switch (6). The unit receives the voltage (Vaux) from the auxiliary winding only during demagnetization periods of the secondary winding (7). The voltage converter has a switch (6) control circuit (11). The switch connects a current supply to a primary winding (5) of a transformer (4). One of the transformers secondary windings (7) is connected to a capacitor (C2) which provides a continuous regulated output voltage (Vout). An auxiliary winding (8) of transformer provides a voltage supply to the control circuit. Sensors (23,24) detect the demagnetization periods of the auxiliary winding (8).
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