| 摘要 |
An electroluminescent display power supply is supplied with DC power at input terminals 101, 102. Terminal 101 is connected to the center-tap of three terminal inductor113, the outer terminals of which are connected across the display 115. The three terminal inductor unit and the display together form an electrical inductive capacitive resonant circuit having a resonant frequency. The controllable transistor switches 104, 105 are connected respectively between the second input terminal and the first output terminal and the second input terminal and the second output terminal. Controller circuitry is connected to each of the switching transistors to cause each of the switches to open and close alternately and in opposite phase to a state of the other switching device at a rate corresponding to an operating frequency at or near the resonant frequency of the resonant circuit. This ensures the supply of alternating current to the electroluminescent display that is substantially sinusoidal. |
