| 摘要 |
<p>A cold filament detection circuit connected between first and second lines through which a voltage and current supply source supplies voltage and current to a light-emitting load, the voltage and current supply source having a set up time during which no current is supplied to the light-emitting load, said cold filament detection circuit comprising:
a) a resistor;b) means for connecting said resistor between the first and second lines in response to the voltage on the first and second lines to thereby establish through said resistor a current path between said first and second lines; andc) means for disconnecting said resistor from between the first and second lines in response to the current supplied to the light-emitting load; whereby, during the set up time no current is supplied to the light-emitting load and the current path is established through said resistor to emulate the impedance of an incandescent lamp, and when current is supplied to the light-emitting load, the resistor is disconnected from between sad first and second lines.</p> |
