Electric power conversion systems – Current conversion – Using semiconductor-type converter
Patent
1998-03-23
1999-04-20
Wong, Peter S.
Electric power conversion systems
Current conversion
Using semiconductor-type converter
323225, 363 16, H02M 75387
Patent
active
058962875
ABSTRACT:
A direct current boost converter which has a simple structure using only one coil, and which can apply a driving voltage to a capacitive load which reciprocates in polarity is discussed. A first direct current branch circuit composed of first and second transistors is connected in parallel to a second direct current branch circuit composed of the third and fourth transistors. A coil is connected between the intermediate nodes of the transistors of these direct current branch circuits, and these nodes are further connected to both terminals of an EL panel through first and second diodes. The nodes between the first and second diodes and the EL panel are grounded through fifth and sixth transistors, respectively. A clock signal is applied to the first and third transistors, and a gate signal with an opposing phase is applied to the second and fourth transistors. Zener diodes can be connected in series to the switching circuits connected between the negative terminal of the DC power supply DC power supply and the side of the EL panel. Since these Zener diodes would be in parallel with respect to the EL panel, the flow of energy to the circuit board through the parasitic transistor structure of the Zener diodes is prevented. As a result, the loss of energy due to both electrical leaks and high-frequency spikes is eliminated.
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Cassis Marco
Mihara Masaaki
Carlson David V.
Han Y. J.
STMicroelectronics K.K.
Wong Peter S.
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