| 摘要 |
<p>To the common point C of two transistors of a magnetron, switched converter power circuit is connected a coupling capacitor which provides input to a starter circuit. A transistor switch is in series with the capacitor and a diode. When the switch is off no current flows in D11. When the switch is made, D11 conducts during alternate halves of cycles present at C. A second diode also conducts and allows current to pass through discharge capacitor. This progressively charges until the voltage across it reaches the breakdown voltage of a gas discharge tube GTD. Whereupon the capacitor discharges through the primary winding of transformer TR2. The secondary winding has many more turns and a starter voltage is induced in the starter electrode. This is isolated from the Faraday cage and terminates adjacent the crucible, close to the void.</p> |
