公开(公告)号：WO1993007733A1

公开(公告)日：1993-04-15

申请号：PCT/US1992008646

申请日：1992-10-12

Applicant: NORAND CORPORATION

Inventor： NORAND CORPORATION ,  KOENCK, Steven, E. ,  WOLF, Roger, L. ,  ALT, Daniel, E.

IPC: H05B37/00

CPC classification number: H05B33/08 ,  Y02B20/32

Abstract: A drive circuit (160) for an electroluminescent panel (12) applies an AC voltage cycle at typical power cycle frequencies by increasing the voltage profile in discrete, pulsed steps at a rate which is at least one order of magnitude greater than the AC frequencies applied to power the panel (12). A transformer (42) through which the power pulses are applied to the panel is of smaller size than state of the art resonant transformers for applying power cycles to electroluminescent panels. The reduced size of the transformer (42) is advantageous in packaging the drive circuit in portable devices using electroluminescent panels (12). The voltage steps at the leading edge of the voltage excursions of the AC cycle applied to the panel (12) may be programmably changed to adjust the light output of the panel (12), or to adjust the power applied by the circuit (85) to correspond to the size of the panel (12) to which the power is applied.

Abstract translation: 用于电致发光面板（12）的驱动电路（160）以典型的功率周期频率施加AC电压周期，通过以比应用的AC频率大至少一个数量级的速率以离散的脉冲步长增加电压分布 为面板（12）供电。 功率脉冲施加到面板的变压器（42）比用于向电致发光面板施加功率循环的现有技术的谐振变压器的尺寸更小。 变压器（42）的减小的尺寸有利于使用电致发光面板（12）将驱动电路封装在便携式设备中。 施加到面板（12）的AC循环的电压偏移的前沿处的电压阶跃可以可编程地改变以调整面板（12）的光输出，或者调整由电路（85）施加的功率， 以对应于施加电力的面板（12）的尺寸。