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Discharge lamp lighting device and lighting unit

A technology for lighting equipment and discharge tubes, applied in the field of discharge tube lighting equipment and lighting units, can solve problems such as complex control, and achieve the effects of increasing power conversion efficiency and reducing ineffective power

Inactive Publication Date: 2006-08-30
TOSHIBA LIGHTING & TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the aforementioned devices that reduce the power loss of switching elements and inductors to increase power conversion efficiency, there is a problem that the control will become complicated

Method used

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  • Discharge lamp lighting device and lighting unit
  • Discharge lamp lighting device and lighting unit
  • Discharge lamp lighting device and lighting unit

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0039] like figure 1 As shown, a DC power source 1 is connected to a high-frequency inverter circuit 2 . The high-frequency inverter circuit 2 has a circuit configuration as follows. Specifically, a series circuit including a pair of MOSFETs 3 and 4 is connected to the DC power source 1 . The drain terminal of MOSFET 4 is connected to one end of filament electrode 7a of discharge tube 7 through first capacitor 5 and inductor 6 connected in series. The source terminal of the MOSFET 4 is connected to one end of the other filament electrode 7 b of the discharge tube 7 . A second capacitor 8 is connected to carry a preheating current through the other ends of the filament electrodes 7a and 7b.

[0040] The aforementioned inductor 6, discharge tube 7 and second capacitor 8 form a resonant load circuit including an LC series resonant circuit. The first capacitor 5 is a capacitor for cutting off direct current. MOSFETs 3 and 4 are connected in parallel with diodes 9 and 10 as pa...

no. 2 example

[0051] The same reference numerals are used to designate the same or corresponding components of the aforementioned first embodiment; therefore, details thereof are omitted.

[0052] According to the second embodiment, as Image 6 As described, a hardware circuit is used instead of the CPU to perform on / off control of the MOSFETs 3 and 4 of the inverter circuit 2 . Specifically, the hardware circuit has a sinusoidal voltage source (generator) 21 , a triangular wave signal source 22 and a comparison circuit 23 . The sinusoidal voltage source 21 generates a sinusoidal voltage with a frequency fL. The triangular wave signal source 22 generates a triangular wave signal having a frequency that is an integer multiple of the sinusoidal voltage frequency fL generated from the sinusoidal voltage source 21 . The comparison circuit 23 compares the sinusoidal voltage from the sinusoidal voltage source 21 with the triangular wave signal from the triangular wave signal source 22 . If the...

no. 3 example

[0059] The same reference numerals are used to designate the same or corresponding components of the aforementioned first embodiment; therefore, details thereof are omitted. According to the third embodiment, the discharge tube current is detected to perform feedback control.

[0060] see Figure 8 , the other filament electrode 7b of the discharge tube 7 is connected to a transformer 25 forming a discharge tube current detecting means. Specifically, each end of the filament electrode 7b is connected to one end of the first and second coils 25a and 25b, respectively. The other end of the first coil 25 a is connected to the source terminal of the MOSFET 4 . The other end of the second coil 25 b is connected to the capacitor 8 .

[0061] There is also provided a third coil 25c magnetically coupled to the aforementioned coils 25a and 25b. An input terminal of a full-wave rectification circuit 26 including a diode bridge is connected across the coil 25c.

[0062] A parallel c...

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Abstract

A discharge lamp operation device includes: a high-frequency inverter circuit (2) for controlling a pair of MOS FET to alternately turn ON and OFF and converting voltage of a DC power source (1) to high-frequency voltage; a resonance load circuit having an inductor (6), a capacitor (8), and a discharge lamp (7) which are supplied with the high-frequency voltage from the inverter circuit and having an argument set between -20 deg and 40 deg for the lighting frequency fs in the impedance when the discharge lamp performs rated operation; and a CPU (13) for continuously generating a pulse voltage for driving the MOS FET (3, 4) ON and OFF with a shorter cycle than the lighting cycle of the discharge lamp (7) according to program data and the data stored in a memory and performing pulse-width modulation control of the ON-width of the pulse voltage according to the waveform change of the sinusoidal wave voltage corresponding to the lighting cycle. Substantially sinusoidal wave current is supplied to the discharge lamp (7) from the high-frequency output from the inverter circuit (2).

Description

technical field [0001] The invention relates to a discharge tube lighting device and a lighting unit. Background technique [0002] Generally, it is well known that a discharge tube lighting device has the following circuit configuration (for example, see Japanese Laid-Open Application Publication No. 10-243661). According to this circuit configuration, a DC power supply is connected in series with a pair of switching elements. A switching element is connected in parallel with a resonant load circuit including an inductor, a capacitor and a discharge tube. The DC voltage is converted into a high-frequency voltage by the switching operation of each switching element, so that it can be supplied to the discharge tube. In the aforementioned circuit configuration, the power loss of the switching element and the inductor can be reduced to improve the power conversion efficiency. Contents of the invention [0003] However, in the aforementioned apparatus in which the power los...

Claims

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Application Information

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IPC IPC(8): H02M7/48
CPCY02B20/202
Inventor 高桥雄治清水惠一
Owner TOSHIBA LIGHTING & TECH CORP
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