| 摘要 |
<p>The system has a flat coil of wire carrying a pulsating current at a frequency of 20 kHz from a bridge comprising four transistors (T1-T4) coupled into an H configuration. The bridge is controlled by a monostable main circuit whose activating pulses are applied alternately to pairs of the transistors. A monostable timer, a feedback loop and a selector for heat energy are used to control the main circuit. A limiter protects the transistors. A device draws off the inductive energy stored in the coil after each actuation pulse. The feedback loop consists of two diodes connected to the coil.</p> |
