Chong G Lim

US Patent:

44595050, Jul 10, 1984

Filed:

May 28, 1982

Appl. No.:

6/383033

Inventors:

Chong C. Lim - Hamilton Square NJ

Assignee:

RCA Corporation - New York NY

International Classification:

H01L 4108

US Classification:

310318

Abstract:

An ultor voltage generator for a television receiver includes a piezoelectric transformer arrangement constituting a plurality of piezoelectric transformer elements, each having input, output and common electrodes. The voltage gain characteristic of each element has a relatively narrow frequency bandwidth about its natural frequency of mechanical vibration. The plurality of piezoelectric transformer elements are electrically connected in parallel. The output electrodes are connected to a supply terminal of the arrangement, and the input electrodes and common electrodes are connected to input and common terminals, respectively, of the arrangement. A source of alternating voltage is coupled between the input and common terminals to generate a higher amplitude alternating output voltage between the supply and common terminals. The alternating output voltage is applied to a doubler rectifier to generate a DC ultor voltage for the television receiver picture tube. The natural frequencies of the plurality of piezoelectric transformer elements differ from one another substantially in order to produce a resultant voltage gain characteristic of the entire arrangement that is of significantly broader frequency bandwidth than that of any one of the constituent elements.

US Patent:

41538625, May 8, 1979

Filed:

Apr 17, 1978

Appl. No.:

5/897031

Inventors:

Chong C. Lim - Hamilton Square NJ

Assignee:

RCA Corporation - New York NY

International Classification:

H01J 2970

US Classification:

315408

Abstract:

A self-regulating deflection circuit includes a first inductor and switching transistor coupled across the unregulated voltage supply. A damper diode, retrace capacitor and second inductor are coupled in parallel, and the parallel combination is coupled across the transistor by a first rectifier poled to prevent current from flowing from the first inductor to the second inductor. A second rectifier is coupled between the first and second inductors for transferring energy from the first inductor to the second during the retrace interval. A control circuit coupled to the second inductor and to the base of the switching transistor controls the time during the first half of the trace interval during which the transistor conducts to allow energy to be stored in the first inductor. A storage capacitor is coupled in series with the second rectifier. Charge accumulation on the storage capacitor and resultant blocking of the second rectifier is prevented by a resistor coupled across the storage capacitor.