JPS58218795A - Method of firing discharge lamp - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] This invention is a cold cathode discharge lamp that uses high frequency and high voltage. I
- It relates to a method for lighting a discharge lamp in which lighting is maintained using an IL low-frequency power supply voltage.

When lighting a discharge wrap using a commercial AC power source, generally a power of 1
As shown in the figure, a discharge lamp 3 is connected to an AC power source 1 via a current limiting choke 2, and a starting means 4 is connected in parallel to the discharge lamp 3. Although various types of starting means 4 have been proposed, the applicant has previously proposed a step-up inductor 6 for the oscillation capacitor 5, as shown in FIG.
A step-up oscillation circuit g in which a series circuit of a bidirectional two-terminal thyristor (hereinafter simply referred to as a thyristor) 7 is connected in parallel;
・It was proposed to use 8.

The boost oscillation circuit 8 has a voltage of about tlVloKHz and a voltage of about tlVloKHz.
, because a high voltage of several to 10 times the voltage can be obtained.

It is advantageously used for hot cathode low-pressure discharge lamps such as fluorescent lamps, but in the case of cold cathode high-pressure discharge lamps (HID) such as high-pressure mercury lamps, commercial sodium lamps, and high-pressure metal halide lamps, it is If there is a shortage of light, especially if you try to restart immediately after the full moon has started, the vapor pressure inside the arc tube will be extremely high.
jl) Because the starting voltage is extremely high, the boost oscillation circuit 8's capacity for 1 is low enough to restart in most cases, and if you try to restart it immediately after turning on the lights, it will be difficult to restart. large.

There was a problem in that an expensive booster was required.

In addition, supplying such high voltage to the wiring path in the lighting equipment is subject to strict regulations regarding wiring FA, insulation between the wiring and metal parts, voltage resistance, etc., and there is also the risk of electrical shock.

Therefore, the main object of the present invention is to provide a cold cathode discharge lamp that can be started for the first time and/or restarted immediately after turning off.
Moreover, it is an object of the present invention to provide a safe discharge lamp lighting method in which the starting means can be miniaturized.

To summarize this invention, a commercial low-frequency AC power supply voltage is converted into a high-frequency voltage, this high-frequency voltage is boosted using a plurality of high-frequency voltage boosting means, and the output voltage or energy of each high-frequency voltage boosting means is added or multiplied. The cold cathode discharge lamp is started by applying it to the cold cathode discharge lamp, and is kept lit using the low frequency AC power supply voltage.

Hereinafter, practical examples of the present invention will be explained with reference to the drawings.

FIG. 3 shows a circuit diagram of a discharge lamp lighting device based on the discharge lamp starting method of the present invention. In the bacteria, 10 is a commercial low frequency AC power supply, 11 is a high +f? + wave block current limiting means, 12
is a low frequency AC power supply 10 vc which is connected to the high frequency block adding means 11 and generates a high frequency voltage; 13° 14 is a high frequency voltage which boosts the high frequency voltage generated by the high frequency power supply 12; Each output voltage is added or multiplied by the boosting means. Re-point every 15± cycles! A low-pressure or high-pressure cold cathode discharge lamp.

In other words, the present invention directly converts the low frequency AC power supply voltage into
Rather than boosting the voltage, first convert it to a high frequency voltage,
The generated energy per unit time is increased by 1, and the initial startup of the cold cathode discharge lamp is also required for the initial start of the cold cathode discharge lamp due to the conversion of this high frequency voltage uzf. This high-frequency voltage is then boosted by using a plurality of high-frequency high-voltage boosters (1) to multiply or multiply each output voltage to supply a large amount of energy per unit time to the cold cathode of the discharge lamp. By doing so, it is possible to instantly restart mercury lamps and high-pressure sodium lamps, which are generally considered difficult to restart, or to restart metal pararite lamps.
Significantly shortened or low-pressure sodium lamps.

Attempts are being made to miniaturize cold cathode low pressure discharge lamps such as cold cathode fluorescent lamps, or high frequency power sources or high frequency voltage boosting means for starting and lighting them.

FIG. 4 shows a circuit diagram of a specific embodiment of FIG. In the figure, the high frequency block current limiting means 11 is composed of a single choke filter. Further, the high-frequency electric circuit #12 is composed of a boost oscillation circuit 8 formed by connecting a series circuit of a boost inductor 6 and a thyristor 7 in parallel to an oscillation capacitor 5, similar to the starting means 4 shown in FIG. . Tatashi,
The output type f+ is a cold cathode high pressure discharge lamp 15 which will be described later.
It is not so high that it can be restarted immediately after the full moon. Furthermore, the high-frequency voltage boosting means 13 is composed of a series circuit of an inductor 16 and a content 17, and the high-frequency boosting means 14 is composed of a series circuit of an inductor 18 and a content 19, so that the series synchronizes with the output frequency of the high-frequency power supply 12. It has become. And HiJ inductor 1
6 and content 17 ik column circuit and inductor 18
The content 190Fb-column circuits are connected in parallel so that the inductor and capacitor positions are different from each other.

A cold cathode high pressure discharge lamp 15 is connected between a connection point between the inductor 16 and the content 17 and a connection point between the inductor 18 and the capacitor 19.

In the above configuration, the low frequency alternating power supply 10 is set to 1? Then, the oscillation content 5 is charged through the choke coil 11, and when its terminal voltage reaches the breakover voltage of the thyristorp, the thyristor 7 becomes conductive, and the voltage is boosted by the cooperative action of the oscillation capacitor 5 and the boost inductor 6. The oscillation operation starts, and a high frequency high? lj pressure is generated. This high frequency high voltage is given to the high frequency voltage boosting means 13 and 14, so that the inductor 16 and capacitor 17, and the inductor 18 and capacitor 1
A very high high frequency high voltage is applied to the 9 lamp 15 and a large amount of energy proportional to the frequency is supplied, so that the cold cathode high pressure discharge lamp 15 is started and its electric transport IIA
The temperature increases rapidly and the glow discharge changes to an arc discharge.

At this time, the internal impedance of the cold cathode high pressure discharge lamp 15 is very small, so the high frequency power source 12 is short-circuited.
The high frequency power supply 12 stops the boost oscillation operation. Accordingly, the high frequency voltage boosting means 13 and 14 also stop boosting the high frequency voltage. Thereafter, the vapor pressure of the discharge lamp 15 increases with the passage of time, and its light output also increases accordingly, and when the vapor pressure becomes stable, the light output also becomes stable.

In this state, when the cold cathode high pressure discharge lamp 15 is turned off using a power switch (not shown) and the power switch is immediately turned on, the high frequency power supply 12 and the high frequency voltage boosting means 13
．． 14, the boosted and added high-frequency high voltage is applied to the cold cathode high-pressure discharge lamp 15, so if this high-frequency high voltage is set higher than the restart voltage, the cold cathode high-pressure discharge lamp 15 can be activated. Can be restarted. here,
A conventional general oscillation circuit has a curve 711 shown by a dotted line in FIG.
As shown in FIG. 5, the power supplied to the load decreases as the load increases, whereas the boost oscillation circuit 8 shown in the embodiment has a curve e2 shown by a solid line in FIG.

Since it has a characteristic that the power supplied to the load increases as the load increases, it is extremely advantageous for initial starting and restarting.

As described above, according to the embodiment shown in FIG.
In step 2, for example, a commercial low frequency AC power supply voltage of 60 Hz and 100 V is converted to a high frequency of several tens of KHz 1 and a voltage of 300 V or less, and this high frequency voltage k s+ ′i″1
m N fl, “111°・”°701°°°°“
・.

If the pressure is increased to a certain degree, a mercury lamp or a sodium lamp can be used.
It becomes possible to restart the device instantly, and with metal paralite lamps, etc., the restart time can be significantly shortened by L〈'PJ. Therefore, in some cases, the starting auxiliary electrode, which was conventionally considered indispensable, can be omitted. Moreover, since the high frequency power source 12 does not suddenly rise to an island voltage of 400 OV, the high frequency power source 12 can be made extremely compact and inexpensive. Moreover, the high-frequency voltage boosting means 13, 14 can significantly reduce the size of the inductor 16.18 and the capacitor 17.19 compared to the case of boosting a low-frequency voltage, and the output of the plurality of high-frequency voltage boosting means 13.14 can be significantly reduced. Since the voltages were added and applied to the cold cathode high pressure discharge lamp 15, a single high voltage: 0! i, inductor 16.18 and capacitor l'7, compared to the case of using voltage boosting means;
19 can be further downsized. In particular, when the high frequency power supply 12 is configured with the boost oscillation circuit 8, the oscillation output frequency is several tens of
Although it is about KH2, the oscillation output waveform is sawtooth waveform and contains harmonics, so the high frequency voltage boosting means 1
If one or both of 3.14 are made to resonate in series with high-order harmonics, the inductor 16.18
There is also an advantage that the capacitors 17 and 19 can be further miniaturized.

In addition, the output voltage f4 of the high frequency power supply 12 is suppressed to a relatively low voltage of 300 V or less, and the voltage boosting means 13 and 14 are placed in the vicinity of the discharge lamp 15 or the cold cathode high pressure discharge lamp. /715 or in the socket in which it is installed, not only does insulation and voltage resistance between wires in the appliance and between wires and metal parts become simpler and cheaper, but also eliminates the risk of electric shock.

FIG. 6 shows a circuit diagram of a discharge lamp lighting device according to another embodiment of the present invention. The difference from FIG. 5 is that the high frequency voltage boosting means 1
Another high-frequency voltage boosting means 14 is connected in a 3ft row to the capacitor 17 constituting the capacitor 3. In addition, the cold cathode low pressure discharge lamps 15a and 1
5b are connected in series, and the high frequency voltage boosting means 1
4 is a cold cathode low pressure discharger.

Connected in parallel to lamp 15a, inductor? The series circuit of the capacitor 18 and the capacitor 20' is connected in parallel to the other cold cathode high pressure discharge lamp 15b.

In the above configuration, when the low frequency variable current power source 10 is connected, the high frequency power source 12 generates a high frequency voltage in the same manner as described above, and the high frequency voltage boosting means 13 boosts this high frequency voltage.
do. However, in this embodiment, since the high frequency voltage boosting means 14 is connected to the capacitor 17, the high frequency high voltage boosted by the high frequency voltage boosting means 13 is further boosted by the high frequency voltage boosting means 14. A significantly high high frequency high voltage is obtained across the capacitor 19, and this high frequency high voltage is applied to the cold cathode low pressure discharge lamp 15a, so that this discharge lamp i5a starts, and the other cold cathode low pressure discharge lamp 15b accordingly starts. Start. -0 That is, in this embodiment, as a result of multiplying the boosting ratios of the high frequency voltage boosting means 13 and 14, the high frequency voltage boosting means j3, l
4 can be further miniaturized.

In each of the above embodiments, the single choke coil used as the high frequency chain current limiting means 11 may be replaced with a leakage transformer, or in some cases may be configured with a series circuit of an incandescent filament and a high frequency 70mm foil. Good too.

one! In addition, when improving the high frequency power supply 12 with a boost oscillation circuit 8, a positive bias winding 61 is electromagnetically coupled to the boost inductor 6, and this positive bias winding 61 is connected to the oscillation capacitor 5. Alternatively, the desired high frequency and high voltage may be obtained using a smaller boost inductor. Also,
An intermittent oscillation capacitor 9 is connected in series with the 4-voltage inductor 6 and the thyristor series circuit or in series with the step-up oscillation circuit 8, that is, at least in series with the thyristor 7, so that the high frequency π of the high frequency power supply 12 is controlled during the pressure generation period. , low frequency AC power #! It may also be limited to only the beginning of each half cycle of voltage. In such a case, the high frequency power supply 12
Since the input terminal is intermittently small, it can be made smaller and cheaper than the high frequency power supply 12, and power loss can be reduced.

In addition, if the intermittent oscillation capacitor 9 is connected, especially when starting the cold cathode high-pressure discharge lamp 15, the cold cathode discharge lamp 15 will start and try to shift from slow discharge to arc discharge. At this time, the high-frequency power source 12 was short-circuited because the internal impedance of the cold cathode high-pressure discharge lamp 15 that caused the glow discharge was extremely small.

When a voltage is left between the terminals of the intermittent oscillation capacitor 9 L1
Since this energy is given to the cold negative-fed high-pressure discharge lamp 15 in the next half cycle, there is also the advantage that the transition to arc discharge is facilitated. However, the use of high frequency power supplies other than the boost oscillator circuit 8 is not prohibited.

Furthermore, when applying the high frequency high voltage boosted by the high frequency voltage boosting means 13.14 to the discharge lamps 15.15a and 15b, it is not only applied between the main electrodes of the discharge lamps, but also between nearby conductors, starting auxiliary electrodes, etc. Provide a starting aid,
The voltage may be applied to this starting aid means.

As described above, the present invention converts a low-frequency AC power supply voltage into a high-frequency voltage to increase the generated energy, and boosts this high-frequency voltage to a high voltage in an additive or multiplicative manner using a frame number of high-frequency voltage boosting means to generate a discharge lamp. Because it applies to
By using an inexpensive high-frequency power supply and high-frequency voltage boosting means,
4 Yin + i < (A pressure discharge lamps and 4 Yin (1 high pressure discharge lamps) can be started for the first time and/or restarted at a distance of more than 4 m.

Furthermore, by suppressing the high-frequency voltage of the high-frequency power source, it is advantageous for insulation and voltage resistance, and there is no danger of electric shock.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram for explaining a general lighting method of a high-intensity discharge lamp, Fig. 2M is a circuit diagram for explaining a cold cathode discharge, which is the background of this invention, and a lamp lighting method.
The figure is a basic block diagram for explaining the method of lighting a cold cathode discharge lamp using this IJj generator, Figure 4 is a circuit diagram of a specific example of Figure 3, and Figure 5 is a circuit diagram of a high-frequency power source. FIG. 6 is a circuit diagram of another embodiment of the present invention. 10... Low frequency AC power supply, 11... High frequency block limit h, means (single choke coil), 12... High frequency power supply, 13.14... High frequency voltage boosting means, 15.15
a, 15b... Cold cathode discharge lamp. Figure 1 Figure 2 Figure 3 Figure 5 Unloading Figure 6

Claims (1)

[Claims] A low frequency AC power supply voltage is converted into a high frequency voltage via a high frequency block current limiting means, and this high frequency voltage is boosted by a plurality of local voltage boosting means so that the output voltage of each high frequency voltage boosting means is added or multiplied. , a discharge lamp lighting method in which a cold cathode discharge lamp is started using this boosted high voltage and kept lit using a low frequency AC power source.