Driving an EL panel without DC bias
View Patent ↗An inverter is coupled to an EL lamp by a high pass filter including a series capacitor and a shunt resistor. The resistor is coupled in parallel with the EL lamp. The high pass filter has a time constant greater than 0.005 seconds and the capacitor has a capacitance at least ten times the capacitance of the EL lamp.
1. In a power supply for driving an EL panel from an inverter, said panel including at least one EL lamp, the improvement comprising:
a high pass filter coupling said inverter to said EL lamp to eliminate DC bias on the EL lamp;
wherein said high pass filter includes a series capacitor and a shunt resistor.
2. The power supply as set forth in claim 1 wherein said capacitor has a capacitance at least ten times the capacitance of said EL lamp.
3. The power supply as set forth in claim 1 wherein said resistor is coupled in parallel with said EL lamp.
4. The power supply as set forth in claim 1 wherein said high pass filter has a time constant greater than 0.005 seconds.