| 摘要 |
The circuit includes an inverter (1) with two branch circuits (a, b) which can be connected to a direct-current voltage supply (Vb) and which include respective electronic switches (3a, 3b) in series with respective primary windings (4a, 4b) coupled inductively to the same secondary winding (5) which is connected to the lamp (L). A frequency-dependent impedance (7) is connected in series with the lamp. A control circuit (11) connected to a current-sensing resistor (9) which is in series with the lamp (L) makes the switches (3a, 3b) conductive alternately so that an alternating voltage, the frequency of which depends on an external control signal, is developed in the secondary winding (5). <IMAGE> |
