JPH02144806A - Electric discharge lamp lighting device - Google Patents

Abstract

PURPOSE:To reduce distortion of an input current waveform and widen a range of dimming control by arranging a signal line for control near an input line side which has a voltage with a frequency lower than an output line where a high frequency voltage is set up in case of wiring to an electric distribution board. CONSTITUTION:A switching element of a high frequency power conversion means is controlled by an external signal and also a signal line 30 for control is arranged near an input line 10 which has a voltage with a frequency lower than an output line 20 where a high frequency voltage is set up in case of wiring to an electric distribution board 2. Thereby, a distortion of an input current waveform is reduced, and an electric discharge lamp lighting device with a board dimming control range can be obtained, and also it is possible to obtain a stable dimming output to the discharge lamp at the time of dimming control by such a constitution that the dimming signal line 30 to the distribution board 2 is arranged such that it is hardly superposed with a high frequency noise.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a discharge lamp lighting device for lighting a discharge lamp at high frequency.

(Prior Art) Conventionally, in order to control the dimming of a discharge lamp, it has been widely used to control the dimming from the outside of a discharge lamp lighting device using a dimming control line.

FIG. 7 shows a phase control type dimmer showing an example of such a configuration, and the configuration includes an inverter device l which generates a high frequency output voltage as a high frequency power conversion means via a dimmer 100 to an alternating current power source AC. A lamp 102 such as a fluorescent lamp is connected to the output end of this inverter device 101.

The inverter device 101 includes a rectifier 1 that rectifies AC voltage.
03 and an inverter 10 that converts DC voltage into high frequency voltage.
It is composed of 4 and 4.

The dimmer 100 connects one AC power supply AC terminal and the rectifier 10.
A control element 105 such as a triac inserted between
, a control section 111 that controls this control element 105 , and a dimming signal 106 that is transmitted to this control section 111 and determines the dimming level of the lamp 102 .

In the conventional example configured in this way, continuous dimming by phase control is possible, and the dimming signal 106 is not input directly to the inverter device 101, but a separate or separated dimmer is used. 100, the dimming signal 106 is mainly input to the inverter 104.
There are almost no adverse effects such as malfunctions due to the superposition of high frequency noise generated from the However, since the dimming of the discharge lamp 102 is performed by controlling the phase of the AC voltage, the input current waveform is greatly distorted, especially in the case of a lighting load for a facility installed in a building with a large number of lights. However, due to the problem that harmonic components have a greater negative effect on other equipment, sufficient consideration was required.

FIG. 8 shows an impedance type dimmer as another conventional example, and the configuration different from the previous conventional example is that the dimmer 1
dimmer switch 107 and dimmer relay 108 instead of 00
A series circuit is connected to both ends of the alternating current power supply AC, and a parallel circuit of the lamp current limiting impedance 109 and the contact 110 of the dimming relay 108 is inserted between the inverter 104 and the discharge lamp 102. be.

In this impedance type dimmer, when dimming, when the dimmer switch 107 is turned on, the dimmer relay 108 is driven and the contact 110 is turned off, and the impedance is 1.
09 can be inserted between the inverter 104 and the lamp 102 to limit the lamp current and dim the lamp.

In such an impedance type dimmer, the distortion of the input terminal waveform can be significantly improved compared to the case of a phase control type dimmer, and malfunctions during dimming due to high frequency noise are almost eliminated. .

However, there was a problem in that there was little flexibility in setting the dimming level in multiple stages, and continuous dimming was not possible.

(Problems to be Solved by the Invention) As described above, in the conventional discharge lamp lighting device, if continuous dimming is performed using phase control, the distortion of the input terminal becomes large, and if impedance dimming is performed, the distortion of the input current is reduced. Although this is an improvement, there is a problem that the dimming becomes stepwise and continuous dimming is not possible.

The present invention has been made in order to improve the above-mentioned problems, and its objectives are to reduce distortion of the input current waveform, widen the dimming control range, and to prevent high-frequency noise from being superimposed on the dimming signal line. An object of the present invention is to provide a discharge lamp lighting device that is difficult to operate.

[Structure of the invention]

(Means for Solving the Problems) The present invention controls the switching elements of the high-frequency power conversion means by external signals, and connects the wiring to the electrical wiring board to a lower frequency voltage than the output line that generates the high-frequency voltage. This device is characterized in that a control signal line is provided near the input line side.

(Function) By configuring the present invention as described above, it is possible to obtain a discharge lamp lighting device with less distortion of the input terminal waveform and a wide dimming control range, and also to reduce the electrical wiring of the dimming signal line. Since the arrangement on the board is such that high frequency noise is difficult to be superimposed on the signal line, stable dimming output to the discharge lamp can be obtained during dimming control.

(Example) Hereinafter, the present invention will be explained in detail based on examples.

FIG. 1 shows a first embodiment of the present invention, and its configuration includes a case 1, an electric wiring board 2 housed in the case 1, and one end surface of the electric wiring board 2. The electrical wiring board 2 includes an input line 10 and a signal line 30 for dimming, and an output line 20 on the other end surface.
The connection point to the input line IO is arranged closer to the input line IO than the output line 20.

The high frequency power conversion means mounted on the electric wiring board 2 includes:
This is shown in the circuit configuration of FIG.

Its configuration consists of input lines 11 and 1 connected to an electric wiring board 2.
A chopper circuit 3 is connected to 2 and an alternating current power supply AC is applied to it, and a rectifier circuit 4 is connected to the output end of the chopper circuit 3.
A so-called half-bridge inverter circuit for generating a high-frequency output voltage is formed at its output end, and the high-frequency output voltage is supplied to the lamp 7.

Here, the chopper circuit 3 is configured to receive an alternating current voltage and output a voltage that is increased or decreased by a large amount of pulsation.

The rectifier circuit 4 is configured to rectify and smooth a voltage with a large pulsation component.

The half-bridge inverter circuit includes a series circuit of transistors Ql and Q2 connected to the output terminal of the rectifier circuit 4, a starting circuit 5 connected to both ends of this series circuit, and an antiparallel connection to the switching element Q1. a diode D2 connected in antiparallel to the switching element Q2, a series circuit of a capacitor CO and a capacitor CI, an inductor T2, and a transformer Tl connected across the switching element Ql, and a switching element Winding Nl of transformer TI that drives Ql and resistor R1
and a series circuit of a winding N2 of a transformer T1 that drives a switching element Q2 and a resistor R2.

The operating state will be briefly explained below.

Now, when the AC power supply AC is input between the input lines 11 and 12, the DC voltage boosted by the chopper circuit 3 and the rectifier circuit 4 is output, and the switching element Q1 and the switching element Q2 start switching operations alternately. Then, a high frequency (11Z in tens to hundreds) output voltage is applied to a lamp 7 such as a fluorescent lamp.

Next, when controlling and dimming the power of the lamp 7, a dimming signal 40 (high frequency, low voltage, variable frequency signal, variable on-duty signal, etc.) is transmitted from the outside to the signal line 30 for dimming. This can be done by transmitting the signal to the control circuit 6 via the control circuit 6 to control the on-period of the switching element Q2 to make the on-period of the switching element Q1 unbalanced. (For example, Japanese Patent Application No. 1137-1983)
(Refer to No. 16) With such a structure, it is possible to provide a discharge lamp lighting device that is capable of continuous dimming, has a wide dimming range, and has little distortion of the input terminal waveform.

However, with only such a circuit configuration, since the signal line 30 for dimming is high frequency and low voltage, it is affected by high frequency noise generated from the output line 20 to which high frequency voltage is applied, and the signal line 30 is affected by high frequency noise. There was a risk that noise would be superimposed and dimming control would become unstable. Therefore, by configuring the signal line 30 to be located on the opposite side of the end surface of the electrical wiring board 2 where the output line 20 is located, as shown in FIG. 1, it was possible to prevent the adverse effects of high frequency noise.

FIG. 2 shows a second embodiment of the present invention, in which a plurality of the embodiments shown in FIG. 1 are housed in a device.

Here, the plurality of cases la, Ib, lc, and ld are housed in the plurality of instruments 8a, 8b, 8c, and 8d, respectively.

With this configuration, the feed wiring of the input line 10 and the feed wiring of the signal line 30 can be easily configured. FIGS. 4 and 5 show the third embodiment of the present invention. 2
A configuration different from the configuration shown in the figure has multiple lamps 71 and 72.
．． 73.74 configuration, and the electric wiring board 2 is configured for multiple lights.

The electric wiring board 2 is configured in a circular shape, with the signal line 30 located on the input line 10 side, and the output line 20 is arranged further away than the distance between the signal line 30 and the input line 10.

FIG. 6 shows a fourth embodiment of the present invention.
The configuration that differs from the configuration shown in the figure is that the electrical wiring board 2 is divided into an electrical wiring board 2a and an electrical wiring board 2b.

The electrical wiring board 2a is configured with an input line IO and a signal line 30, and the electrical wiring board 2b is configured with an output line 20.

Although various embodiments have been described above, the high-frequency power conversion means is not limited to the half-bridge inverter circuit (any type may be used, and any dimming control method may be used. The point is that the control signal line may be disposed closer to the input line, which has a lower frequency voltage, than the output line, which generates a high frequency voltage.

〔Effect of the invention〕

As described above, the present invention provides a discharge lamp lighting device in which the control means for controlling the high-frequency power conversion means and adjusting the output voltage is mounted on an electric wiring board together with the high-frequency power conversion means,
Since the control signal line is connected to the electrical wiring board closer to the input line, which has a lower frequency voltage than the output line which generates a high frequency voltage, there is less distortion in the input current waveform and it is easy to control dimming. It is possible to obtain a discharge lamp lighting device that has a wide range, and also has the remarkable effect that stable dimming output to the discharge lamp can be obtained during dimming control.

[Brief explanation of the drawing]

1 and 2 are schematic configuration diagrams showing a first embodiment of the present invention, FIG. 3 is a schematic configuration diagram showing a second embodiment of the present invention, and FIGS. 4 and 5 are schematic diagrams showing a first embodiment of the present invention. FIG. 6 is a schematic diagram showing a fourth embodiment of the present invention, and FIGS. 7 and 8 are circuit diagrams showing a conventional example. AC...alternating current power supply, 2.2a, 2b...electric wiring board, 101, 3. 4. 5. Ql, Q2 etc.・
... High frequency power conversion means, 6... Control means, ? , 7
1.72.73.74...Discharge lamp, IO...Input line, 20...Output line 1.30...Signal line.

Claims (1)

[Claims] (1) A high-frequency power conversion means that is coupled to an AC power source via an input line to generate a high-frequency output voltage, a discharge lamp that is coupled to this high-frequency output voltage via an output line, and a high-frequency low-voltage signal from the outside. A discharge lamp lighting device comprising: a control means for receiving the high-frequency power conversion means through a signal line and adjusting the output voltage by controlling the high-frequency power conversion means; and an electric wiring board on which the high-frequency power conversion means and the control means are mounted. A discharge lamp lighting device characterized in that a control signal line is arranged closer to an input line that has a lower frequency voltage than an output line that generates a high frequency voltage in the wiring to the electric wiring board. .