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Single output el driver producing reduced current spikes

A capacitor and output technology, applied in the direction of electroluminescence light source, electric light source, DC power input conversion to DC power output, etc., can solve the problems of increasing the cost of integrated circuits, circuit size and cost increase, limitations and so on

Inactive Publication Date: 2008-02-13
WORLD PROPERTIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The four bridge transistors are high voltage components, adding significantly to the size and cost of the circuit
This increases the cost of implementing the inverter as an integrated circuit and limits the technologies that can be used to manufacture the inverter

Method used

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  • Single output el driver producing reduced current spikes
  • Single output el driver producing reduced current spikes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] Detailed Description of Preferred Embodiments

[0026] Figure 4 is a block diagram of an inverter constructed in accordance with the present invention. The EL lamp 12 is powered by an inverter including a positive high voltage power supply 43 , a negative high voltage power supply 44 , and switches 45 , 46 , 47 , and 48 . Switch 46 couples lamp 12 to reference point 1 . Switch 48 couples lamp 12 to reference point 2 . Reference point 1 may be a low voltage power supply or a common point, and reference point 2 may be a low voltage power supply or common point independent of reference point 1. Therefore, Figure 4 represents any of the four circuit combinations. The charge and discharge branches have a common node 49, which is the single-ended output of the inverter.

[0027] Closing switch 45 causes power supply 43 to charge lamp 12 , while closing switch 46 discharges lamp 12 . Closing switch 47 causes power supply 44 to charge lamp 12 , while closing switch 48 disc...

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PUM

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Abstract

An inverter for supplying alternating current to an EL lamp includes a first charging path (43, 45), a first discharging path (46), a second charging path (44, 47), a second discharging path (48), the paths intersecting at a node (49), wherein the node is the output of the inverter from which the alternating current flows. The charging paths include inductive boost circuits having a common inductor.

Description

technical field [0001] The present invention relates to inverters for electroluminescent (EL) lamps, and more particularly, to an inverter that produces relatively low magnitude current spikes through EL lamps having one ground electrode. Background technique [0002] An EL lamp is essentially a capacitor with a dielectric layer comprising phosphor powder and a dielectric layer between two conductive electrodes, wherein one of the dielectric layers is transparent. Since EL lamps are capacitors, an alternating current (AC) must be applied to cause the phosphor to emit light, otherwise, the capacitor is charged to the applied voltage and current flow through the EL lamp is cut off. In the presence of a strong electric field, the phosphor particles are caused to radiate light with a relatively small current. As used herein, an EL "panel" is a single sheet comprising one or more light emitting regions, where each light emitting region is an EL "lamp". [0003] In portable elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/24H02M7/537H02M3/335H05B44/00
CPCH02M3/07H02M3/1584H05B33/08Y02B20/325Y02B20/30H05B44/00H05B41/14
Inventor 肯尼斯·V·翁格哈罗德·G·伊罗泊特·A·基博尔
Owner WORLD PROPERTIES