| 摘要 |
<p>A low voltage converter is operative to up-convert an unstabilised input voltage of the order of one volt to a much higher output level, typically about 9 volts. A current transformer having three windings is used, one winding of which generates from a primary winding a base current for a switching transistor. The third winding reverses the magnetic flux when the transformer core saturates, thereby forming an oscillatory cycle, the mark-to-space ratio of which determines the voltage step-up ratio. Once the converter has generated a sufficiently high output voltage, a control circuit can take over to produce a precisely controlled output level.</p> |
