Synthesized resonation for an EL driver circuit

Details Synthesized resonation for an EL driver circuit Synthesized resonation for an EL driver circuit

2007-10-09

2007-10-09

Vo, Tuyet (Department: 2821)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

C327S537000, C327S538000, C327S540000, C315S307000, C315S291000, C315S247000, C315S224000

Reexamination Certificate

active

11364370

ABSTRACT:
A driver circuit for an electroluminescent (EL) lamp that consumes less power and reduces electromagnetic interference (EMI). Electrical charge is stored during a discharge cycle of an AC signal employed to illuminate an EL lamp, and subsequently reused during the AC signal's charging cycle. The reuse of electrical charge enables the driver circuitry to illuminate the EL lamp while drawing the least amount of power from a power supply, such as a battery. Also, multiple charge pumps can be sequentially/serially turned off during the discharge cycles of the AC signal driving the EL Lamp. By sequentially discharging the EL lamp, a waveform for the AC signal can be synthesized that more closely resembles a relatively symmetrical sinusoidal shape. The relatively symmetrical shape of the synthesized AC waveform serves at least in part to reduce spurious emissions of electromagnetic interference (EMI), audio noise, and improve the efficiency of the driver circuitry.

REFERENCES:
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Patangia et al., “A Switched-Capacitor Inverter for Driving a Highly Capacitive Load,” IEEE International Conference on Industrial Technology, pp. 525-529 (2004).
Supertex, Inc., “High Voltage Low Noise Inductorless EL Lamp Driver” HV850 Data Sheet, pp. 1-2 (Jan. 21, 2004).

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