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Discharge lamp drive control circuit

A technology for driving control circuits and discharge lamps, applied in emergency protection circuit devices, electric light sources, electrical components, etc., can solve problems such as fire, disconnection of discharge lamps, poor connection between discharge lamps and connectors, etc.

Inactive Publication Date: 2008-09-03
SUMIDA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in this case, sometimes the discharge lamp is not connected to the secondary coil of the drive transformer due to poor connection state between the discharge lamp and the connector On the connecting terminal connected to the output terminal on the side, or short-circuit the output terminal on the secondary coil side of the drive transformer for some reason
In this case, there is a possibility of discharge caused by the high voltage driving the transformer, resulting in smoke, fire, etc.
In addition to the above-mentioned reasons, when the discharge lamp itself is damaged or becomes old, the output terminal of the secondary coil side of the drive transformer connected to the connector is in a load open state or a load short circuit state, so that the above-mentioned risk of smoke, fire, etc. high

Method used

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Experimental program
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Effect test

Embodiment approach 1

[0028] FIG. 1 shows a first embodiment of the present invention. In the discharge lamp drive control circuit shown in FIG. 1, two discharge lamps (not shown) are connected. In the discharge lamp driving control circuit shown in FIG. 1, the DC power supply voltage Vin supplied between the terminal 1 and the terminal 3 is composed of a converter control circuit 4, a pair of switching transistors 5 and 6, and a pair of driving transformers 7A and 7B. The converter is converted into a high-frequency driving voltage. The converted high-frequency driving voltage is respectively provided to the first discharge lamp (not shown) connected to the high-voltage side output terminal 23A, the low-voltage side output terminal 24A, and the low-voltage side output lamp connected to the high-voltage side output terminal 23B. These first and second discharge lamps are driven by a second discharge lamp (not shown) on terminal 24B.

[0029] In addition, the terminal 3 is a ground terminal, and is...

Embodiment approach 2

[0050] FIG. 3 shows a second embodiment of the present application, showing an example in which a voltage corresponding to a current flowing through a discharge lamp is detected on the driving transformer side. In FIG. 3, the DC power supply voltage Vin supplied between the terminal 30 and the terminal 32 is converted into a high-frequency driving voltage by an inverter composed of an inverter control circuit 33, a switching circuit 34 including semiconductor switching elements, and a driving transformer 35. . The converted high-frequency drive voltage is supplied to a discharge lamp (not shown) connected to the high-voltage side output terminal 36 and the low-voltage side output terminal 37 to light the discharge lamp. In addition, the terminal 32 is a ground terminal, and is supplied with a ground potential GND.

[0051] In addition, a DC operating voltage Vdd for operating the inverter control circuit 33 is supplied from the terminal 31 . A switch control signal for contr...

Embodiment approach 3

[0059] FIG. 4 shows a third embodiment of the present application. This third embodiment is a modified example of the second embodiment of the present application described in FIG. 3 , and the same reference numerals are assigned to the same parts as those in the second embodiment of the present application, and description thereof will be omitted. In the second embodiment of the present application shown in FIG. 3 , in the case of detecting the voltage corresponding to the driving current of the discharge lamp, detection is performed from the low voltage side of the secondary coil of the driving transformer 35 using a diode 51 and a resistor 52. .

[0060] In contrast, in the third embodiment shown in FIG. 4 , diodes 55 and 56 and a capacitor 57 are provided on the low voltage side output terminal 37 connected to the discharge lamp to detect a voltage corresponding to the drive current of the discharge lamp. This detection method has the same circuit configuration as the det...

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Abstract

Abnormal operation of a discharge lamp is detected using a small number of circuit elements by detecting load open circuit abnormality and load short circuit abnormality of the discharge lamp operating on a high frequency drive voltage through a single comparison circuit. The discharge lamp drive control circuit comprises an inverter control circuit, a positive side potential variation detecting circuit for detecting a positive side potential variation occurring in the secondary coil of a drive transformer, a negative side potential variation detecting circuit for detecting a negative side potential variation occurring in the secondary coil of the drive transformer, and a comparison circuit connected with the inverter control circuit. Outputs from the positive side potential variation detecting circuit and the negative side potential variation detecting circuit are superposed to be supplied to the comparison circuit and compared with a reference voltage, and an abnormal operation control signal is provided from the comparison circuit to the inverter control circuit during abnormal operation.

Description

technical field [0001] The present invention relates to a discharge lamp drive control circuit for controlling the lighting of discharge lamps such as fluorescent lamps, and in particular to a control circuit capable of realizing abnormal operations such as load open circuit abnormality and load short circuit abnormality with a small number of circuit elements The discharge lamp drive control circuit. Background technique [0002] As is well known, discharge lamps such as fluorescent lamps are driven by a high-frequency drive voltage generated by an inverter to emit light. Such discharge lamps are not only used for lighting, but also recently are widely used as light sources for backlights of liquid crystal display devices. The discharge lamp has a structure in which a drive transformer is provided on the output side of an inverter included in the discharge lamp drive control circuit, and an output terminal on the secondary coil side of the drive transformer is connected vi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B41/24H02H7/122H02M7/48
CPCH05B41/2855H02H7/122H02M7/48H05B41/24
Inventor 宫崎弘行
Owner SUMIDA CORP
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