Mira T Kurka

20060279974, Dec 14, 2006

Jun 8, 2005

11/148867

Gary Hanington - Elko NV, US
Mira Kurka - Elko NV, US

H05K 7/20

363141000

Circuit arrangements and methods are disclosed for providing a source of low power DC, direct and isolated from the main AC line. Applications of this circuitry include battery chargers and air ionizers. In this design, a high frequency ferrite transformer is driven by signals created from a bilaterally conducting two state device operating in series with a capacitor . Utilizing a bilaterally conducting two state device , capacitor is alternately charged positive and negative to a certain voltage level depending on the characteristics of . The device will see an increasing voltage across it due to the increasing magnitude of the input AC waveform. When the voltage across reaches the breakover voltage of the device, Vbo, it rapidly changes state from a blocking condition to one of full conduction. When this occurs the stored energy present in the capacitor causes fast rise time pulses rich in high frequency harmonics to be impressed across the primary of the transformer which has been designed with an operating frequency of 20 kHz or greater. A simple rectifier stage on the secondary consisting of will convert the AC pulses generated on the secondary of to the desired DC output voltage where it is filtered with capacitor . For high voltage applications, a multi stage, Cockroft Walton voltage multiplier circuit may be utilized on the secondary of

20060280289, Dec 14, 2006

Jun 8, 2005

11/148868

Gary Hanington - Elko NV, US
Mira Kurka - Elko NV, US

H05G 1/12

378104000

Circuit arrangements and methods are disclosed for providing means of driving a grounded anode triode X-Ray tube using one isolation transformer, providing both filament power and controllable grid drive without the need for optical isolation devices. Applications. of this design include fast X-Ray imaging such as inspection equipment and systems, which require rapid control of X-Ray intensity. Grounding the anode in X-Ray tube systems is usually done for thermal considerations and therefore requires that the filament and grid to be floating at an extremely large negative potential, usually over 100 kVDC. Isolation transformers are-required to provide power to the filament and grid. In this invention, both AM and FM signals are coupled through one isolation transformer. The AM waveform provides controllable power to heat the filament while the FM signal, adjusted in magnitude by a filter arrangement, rectified and smoothed in waveform, provides power for the grid. This design eliminates the need for an additional grid isolation transformer or optical control of the grid element where active circuitry is prone to failure due to tube arcing.