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Inverter circuit

A converter and circuit technology, which is applied to the use of electric light sources, electrical components, gas discharge lamps, etc., can solve the problems of increasing the number of components used and increasing the cost.

Inactive Publication Date: 2008-01-30
SUMIDA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it is also necessary to increase the number of parts used, further increasing the cost

Method used

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Embodiment approach 1

[0023] FIG. 1 is a circuit diagram of an inverter circuit using an even number of drive transformers according to Embodiment 1 of the present invention. In the converter circuit of FIG. 1 , a DC power supply voltage Vin is supplied between a terminal 1 and a terminal 2 . The DC power supply voltage Vin is supplied to the control circuit 3 and the switch circuit 4 as a DC operating power supply.

[0024] The control circuit 3 includes an oscillation circuit inside, and supplies switching pulses to the switching circuit 4 . In addition, the switch circuit 4 generates a high-frequency drive signal by switching the DC power supply voltage Vin in response to a switch pulse supplied from the control circuit 3 . Therefore, the switch circuit 4 includes a switch element composed of a plurality of bipolar transistors or FET transistors.

[0025] In addition, the converter circuit in FIG. 1 has four driving transformers DT1 to DT4 , four balancing transformers CT1 to CT4 and one feedb...

Embodiment approach 2

[0042] 2 is a circuit diagram of an inverter circuit using an odd number of drive transformers according to Embodiment 2 of the present invention. In addition, in FIG. 2, the same code|symbol is used for the same circuit element. In the inverter circuit of FIG. 2 , as in the inverter circuit of FIG. 1 , the DC power supply voltage Vin is supplied between the terminal 1 and the terminal 2 . The DC power supply voltage Vin is supplied to the control circuit 3 and the switch circuit 4 as a DC operating power supply.

[0043] The control circuit 3 has the same configuration and performs the same operation as the control circuit 3 shown in FIG. 1 , and thus description thereof will be omitted.

[0044] The converter circuit according to Embodiment 2 includes five drive transformers DT1 to DT5 , five balance transformers CT1 to CT5 , and one feedback transformer FBT. As shown in FIG. 2, the secondary coils CT1-2 to CT5-2 of the five balance transformers CT1 to CT5 and the primary ...

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Abstract

An inverter circuit is configured with a reduced number of components for driving a plurality of discharge tubes. Primary coils of a plurality of drive transformers are respectively connected in series to primary coils of corresponding balancer-transformers, and then connected between output terminals of a switching circuit in parallel. The secondary coils of the balancer-transformers are connected in series, and connected between the output terminals of the switching circuit to configure an inverter circuit for driving a plurality of discharge tubes. The inverter circuit includes a voltage detecting circuit for detecting a voltage at any of connecting-midpoint of the series-connected secondary coils of the balancer-transformers, and a voltage comparing circuit for comparing an output of the voltage detecting circuit with a reference voltage. A signal designates an abnormal operation at an output of the voltage comparing circuit when the voltage of the connecting-midpoint exceeds the reference voltage.

Description

technical field [0001] The present invention relates to an inverter circuit for controlling lighting of a discharge lamp such as a fluorescent lamp, and in particular to an inverter circuit capable of controlling abnormal operations such as load open abnormality and load short circuit abnormality with a small number of circuit elements. Background technique [0002] It is well known that a discharge lamp such as a fluorescent lamp is driven to emit light by a high-frequency drive signal generated by an inverter. It goes without saying that such a discharge lamp is used for lighting, and recently it is often used as a light source for a backlight of a liquid crystal display device. The inverter circuit and the discharge lamp have a structure in which a driving transformer is provided on the output side of the inverter included in the inverter circuit, and an output terminal on the secondary coil side of the driving transformer is connected through a connector. [0003] Howev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B41/285H05B41/14H05B41/02
CPCH05B41/282H05B41/2855Y02B20/183Y02B20/00H05B41/24H05B41/14
Inventor 宫崎弘行畠山刚
Owner SUMIDA CORP
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