Inverter circuit
AssigneeSumida Corporation
InventorTakeshi Hatakeyama
Life of this patent
Estimating the term…
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
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, wherein:
- one of said conductor patterns of said pattern capacitor is divided into a plurality of small areas which are connected to a respective one of a plurality of jumper pads, and
- an electrostatic capacity of said pattern capacitor is made variable depending on whether each of the jumper pads is shorted or not, wherein a leader pattern is provided to connect to each of said plurality of small areas, and said jumper pads opposed with minute spaces therebetween are provided midway in said leader patterns.
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
- one of said conductor patterns configuring said pattern capacitor, any one of said conductor patterns on one of a front surface and a back surface of the circuit board is divided into a plurality of small areas, wherein a leader pattern is provided to connect to each of said plurality of small areas, and said jumper pads opposed with minute spaces there-between are provided midway in said leader patterns.
Dependencies are inferred from the claim text.