Inverter Circuit
AssigneeSumida Corporation
InventorTakeshi Hatakeyama
Life of this patent
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Abstract
From the individual small areas of a conductor pattern arranged on the back side of a circuit board, there are individually extended leader patterns, which are midway led by through holes to the surface side of the circuit board. The individual leader patterns led to the surface side are connected with a terminal portion on the low-voltage side through jumper pads. The desired small areas are enabled to function by shorting the jumper pads with solder. The individual small areas are constituted to have a capacity of 1 pF, when caused to function, and they have such a capacity as a pattern capacitor as is proportional to the number of the shorted jumper pads.
Claims7
1-5. (canceled)
An inverter circuit driving a discharge lamp comprising:
- a pattern capacitor connected to one end side of a secondary winding of a transformer, and made of conductor patterns provided on opposed surfaces of a circuit board, and wherein
- one of said conductor patterns of said pattern capacitor is divided into a plurality of areas, and an electrostatic capacity of said pattern capacitor is made variable depending on whether a jumper pad, which is connected to each of the small areas of said conductor pattern which are divided into the plurality of areas, is shorted or not.
An inverter circuit driving a discharge lamp, wherein
- in a secondary side of a transformer of said inverter circuit, an electrostatic capacity component determining a resonance frequency relating to drive of said discharge lamp is formed by a pattern capacitor made of conductor patterns provided on opposed surfaces of a circuit board, and
- out of said conductor patterns configuring said pattern capacitor, any one of those on the surface and the back is divided into a plurality of areas.
Dependencies are inferred from the claim text.