| 摘要 |
<p>PURPOSE:To enable light in proportion to a duty ratio of a dimming signal to be outputted by using no integration circuit for an input circuit for the driver circuit of a switching element, but using a switching circuit which directly turns on/off a DC power supply. CONSTITUTION:The output terminal of a driver circuit 9 is connected to the gate of the FET 2 of a switching element via an insulating transformer 8. No integration circuit is used in the input circuit of the circuit 9, but a switching circuit 10 is used, which directly turns on/off a DC power supply. The input circuit is provided with a circuit 10 to input a dimming signal, and the DC power supply is turned on/off by the aforesaid circuit 10, an on/off, signal for dimming is thereby obtained while being amplified, therefore, when the FET 2 is switched by the output of the circuit 8, light in proportion to a duty ratio of a dimming signal can thereby be outputted while being led to no error at all.</p> |
