TW566057B - Lighting device of discharging lamp - Google Patents

Abstract

The object of the present invention is to provide a lighting device of discharging lamp to light the lamp, wherein even if more than one discharge lamp in plural discharge lamp circuits is removed, the remained discharge lamps can be still lighted with about the same discharge lamp current as the quantity when all of the discharge lamps are installed. The lighting device of discharging lamp has an inverter circuit with a half-bridge circuit of a pair of switching devices 2, 3 to convert the DC current supplied by the DC power source 1 into high-frequency current; and loading circuits L100, L110 to light the discharge lamps 5, 10 by the high-frequency current from this inverter circuit. The discharge lamp loading circuits L100, L110 comprise the choke coils 5, 9; discharge lamps 6, 10; a serial connection circuit of coupling capacitors 8, 12; and capacitors 7, 10 connected to the discharge lamps 6, 10 in parallel, each having a pair of secondary coils 5a, 5b, 9a, 9b installed on the choke coils 5, 9 connected to the switching devices 2, 3 in parallel through their own resistors respectively.

Description

566057 5. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to a lighting device for lighting a plurality of discharge lamps with high-frequency power from a self-excited converter circuit. [Conventional Technology] Fig. 9 is a circuit diagram of a conventional discharge lamp device. In the figure, i is a DC power source obtained from a commercial power source, 2 and 3 are switching elements made of MOSFETs constituting a converter circuit, 5 is a current-resistant coil, 6 is a discharge lamp, and 7 is connected to the discharge lamp 6 in parallel. Capacitance, 8 is a _combined capacitor, these constitute a lamp load circuit L100. L110 has the same structure as the discharge lamp load circuit u00 ′, and is connected in parallel to the discharge lamp load circuit L⑽. The discharge lamp load fright circuit is composed of a current-resistant coil 9, a discharge lamp 10, a capacitor η, and a coupling capacitor 12. . , 4 is a current transformer (hereinafter referred to as CT) connected between a connection point of a pair of switching elements 2, 3 and a discharge lamp negative = circuit L1 0 〇, L1 10 parallel circuit connection point The coils 4a and 4b alternately drive the switching elements 2 and 3 with the polarity of the symbol • as shown in the figure, and are connected to the gates of the switching elements 2 and 3 through the respective resistors 13 and 14. ), Source. (In order to show the combination of the primary coil and the secondary coil of CT4, it is indicated by a dashed line in the figure.) However, the switching element f το 2 is built in parallel in the figure. Drain of 3, 3 · Equivalent diode (d1〇de) between source (source). The starting circuit for starting the converter is also omitted in the figure. Figure 10: Shown from Commercial power source to obtain a DC power source] structure example. As shown in the figure, its structure is AC power output from a commercial power source 丨 a 566057 V. Description of the invention (2), / δ ',,' Bridge-type two-pole After body full-wave rectification, it is smoothed by a smoothing capacitor, and the DC power is output to the load circuit. On this structure, once DC The power source 1 is turned on, that is, by omitting the start-up circuit shown in the figure, to alternately drive the thunder lamp 6 of the switching elements 2 and 3 at a high frequency. The lighting effect is achieved. Electricity [to be solved by the invention Problem] In the conventional discharge lamp lighting device, when the discharge lamp 61 ct /, the combined current of the discharge lamp load circuits L100 and L110 flows to _ and the discharge current is caused by the discharge lamp 6 or discharge. If the discharge lamp of either party is removed, the current flowing to CT4 will be reduced, so the voltage of the small coil will also decrease, and the switching element 2 and 3 will move. The voltage is reduced by this, so that the oscillation frequency of the switching circuit changes, so there is a problem that the remaining load is also changed in the discharge lamp current in the discharge lamp load circuit.

In the Uii electric lamp, "if one lamp is removed", the problem is that it is difficult to light the lamp under the condition of point 4 before the removal. In addition, a dedicated CT4 for driving the switching elements 2 and 3 is necessary, which causes problems such as increased cost and difficulty in miniaturization. And because the discharge of the filament of the discharge lamp (fi lament) is reduced by the 'discharge current, or once the positive and negative period of the discharge J = the discharge current of the cycle is reduced, and the asymmetric phenomenon of the discharge current is equivalent to the reduction of the discharge current In the period, the equivalent impedance of the discharge lamp becomes large, so when the discharge lamp load circuit L 100 is consumed by the discharge substance of the filament of the discharge lamp, the circuit of the discharge lamp load circuit L

566057 _Case No. 91109938__ Year H Amendment V. Description of the Invention (4) The current of the circuit is increased to prevent mismatches in the circuit components due to the increase in current. At the same time, it is set to stop when this phenomenon continues. Discharge lamp lighting device for the oscillating protection circuit of the converter circuit. A fourth object of the present invention is to provide a lamp which is provided with a pre-heating period of time determined by a predetermined timing period after the converter circuit is started immediately after the DC power source 1 is turned on, without discharging the filament Discharge lamp lighting device for pre-heating circuit of material consumption and discharge tube wall blackening, and simple and cheap. [Means to Solve the Problem] The discharge lamp lighting device according to the present invention is provided with a DC power source and has half of a pair of switching elements that converts the DC power supplied from the DC power source 1 into a high-frequency current. An inverter circuit made of a bridge circuit and a discharge lamp lighting device for a plurality of discharge lamp load circuits for discharging a discharge lamp by using a high frequency current from the converter circuit, wherein the discharge lamp is loaded Circuit, with anti-coil, discharge lamp? The series circuit of the capacitor and the parallel connection to the above-mentioned discharge lamp and valley are provided with a respective pair of reactance current coils arranged on the load of each of the above-mentioned discharge lamps, and are connected in parallel to the upper m through the respective current-limiting elements. The secondary coil; the output voltage from the secondary coil is used to drive the pair of switching elements mutually. : Equipped with the connection points from each discharge lamp and light-on capacitor to connect to a straight lamp, through the diode, on the vibration; = each discharge; the normal point of the surplus + each cycle, so that the current alternately

566057 5. Description of the invention (5) Flow to the power supply to determine the capacitance of each of the above coupling capacitors. Determine the resonance frequency of the load circuit of the complex discharge lamp, which is approximately the same. When the discharge lamps are normally lit, the voltage of the secondary coil of the drive converter circuit ::: complex current-resistant coil is approximately the same. Here's 2 Λ: Use each Λ pole as a wiring or (wired π) to block i @ W · Η ^ source voltage, and use the voltage after this power supply voltage passes through electricity = 当作 0Γ) as A warm-up timer that controls the above-mentioned converter's electric knife for a control signal of ON time of 70 pieces. The green coil is provided with a secondary coil that drives a plurality of anti-current coils of the switching element of the converter circuit, and the wiring is obtained through the respective diodes, or the voltage obtained by (wlre: 〇〇 is lower than a predetermined value) In most cases, the protection circuit for stopping the oscillation of the above-mentioned switching element of the circuit is changed. [Inventive Embodiments] Embodiment 1 FIG. 1 is a circuit diagram showing a discharge lamp lighting device according to Embodiment 1 of the present invention In the figure, '1 is a DC power source obtained from a commercial power source, 2, 3 are switching elements made of M0SFETs that constitute a conversion Is circuit, 5 is a current-resistant coil, 6 is a discharge lamp, and 7 is a discharge lamp connected in parallel. 6 of the capacitor, 8 is the coupling capacitor 'these constitute the discharge lamp load circuit] ^ 〇〇.

566057 V. Description of the invention (6) L110 is the discharge lamp load circuit ⑽, which is connected to the discharge lamp negative voltage τ, and then w is the discharge lamp load circuit that breaks the parallel circuit L100, and the flow coil 9 1. Discharge lamp 1 Q Lei Jiao * person ten A 1 〇. ^ 'Coupling 11, coupling capacitor 12. And, a pair of secondary lines f5 are provided on the anti-current coil 5 of the load circuit L10〇: and 5 :, and on the anti-current coil 9 of the discharge lamp load circuit L1 10 °-a pair of 2 times The coils 9a, 9b, and the secondary coils 5a, 5b, 9a, 9b alternately with the polarities of the symbols shown in the figure. The n / off drives the switching element 2 3 through the resistance 1 3, 1 5 and the resistance 1 4, 1 6. Gates connected to the gate and source (in order to show the combination of each primary coil and each secondary coil 5a, 5b, 9a, 9b of the current-resistant coils 5, 9) No.) However, the equivalent diodes, which are built in the switching element 23 in parallel, are omitted. The starting circuit for starting the converter is also omitted in the figure. Here, when the discharge lamp 6 and the discharge lamp 10 are output with the same specifications, the circuit constants of the respective discharge lamp load circuits L100 and Ln0 are selected to be equal. In the case where the discharge lamp 6 and the discharge lamp are output with different specifications, 'the resonance frequency at the time of lighting of the load circuit of each discharge lamp is set to be approximately the same', and each of the anti-current coils 5 and 9 at the time of lighting is set. The voltages of the secondary coils 5a, 5b, 9a, and 9b are substantially equal. Hereinafter, the operation of the discharge lamp lighting device according to the first embodiment of the present invention will be described with reference to Fig. 1. In the figure, once the DC power supply 1 is turned on, the discharge lamps 6, 10 of the switching elements 2, 3 are alternately driven at a high frequency by a start circuit that is not shown in the figure, so as to achieve the effect of lighting. Here, even if the discharge lamp on either side is unplugged due to the failure of the life of the discharge lamp, etc., the switching elements 2 and 3 are the secondary coils of the anti-current coil 5

2148-4835-PF (N), ahddub ptd Page 10 566057 V. Description of the invention (7) 5 a, 5 b and anti-parallel driving, the normal resonance frequency of the electric drive lamp of the coil is approximately 5a, 5b, 9a Keep the whole discharge while keeping the discharge lamp inside as above, even if you move the lamp. It is not necessary to be small and compact. The voltage generated on the secondary coils 9a, 9b of the current coil 9 is turned on so that even if the anti-current voltage from any of the anti-current coils 5, 9 disappears, one of the discharge lamps 6, 10 exists. If it is, the load circuit of each discharge lamp is the same when it is turned on, and the voltages of the current-resistance coils 5 and 9 secondary lines and 9b are set to be substantially equal when they are turned on, so the discharge lamps 6 and 1 can be used. 〇 The discharge lamps are held at about the same time under normal discharge. In the multiple discharge lamp, even if one lamp is removed, the current of the lamp does not change, and to save power, one lamp is discharged in multiple discharges, so that the remaining discharge lamps can be normally used for driving the switching element. Therefore, the second chaotic system of Embodiment 2 can be used to show the second embodiment of the present invention. The third diagram is to explain the electric diagram of the current electric lamp lighting device at normal time. Figure 4, Figure 4, and the heart of Example 丨; Figure 2. Same reference numerals, and the description is omitted. Part 5 of Figure 2 is t, with phase L100 added, and 30 is connected to the anode. ; So the anode of the lamp load circuit is connected to the straight

2148-4835-PF (N), ahddub ptd point, the cathode is connected to the DC power source and the connection between b and the coupling capacitor 8 is connected to the connection between the discharge lamp 6 and the coupling capacitor 8 纟 纟 diode, 31 is Cathode 566057 V. Description of the invention (8) Galvanic cathode of the negative electrode. Discharge ^ 1 0 3 On the discharge lamp load circuit 1 ^ 1 1 0, 32 is the connection point where the anode is connected to the positive pole of 1-coupling valley 1 2 and the cathode is connected to the cousin i of the DC power supply capacity 1 2 ~ pole The body '3 3 is a cathode connected to the discharge lamp 10 and a coupling electric body. For example, the anode is connected to the two poles of the negative pole of DC power supply 1! The selection of the electrostatic capacitance values of the discharge lamp load circuit LI 00, the solid-coupling capacitors C8, and C12 is illustrated in FIG. 3 by the LUO. When lighting, the figure j shows the normal capacity Cl2 / ^ of the coupling capacitor C8 of the discharge lamp load circuit L 1 00, and the figure 3 (b) shows the waveform when the coupling electric of the discharge lamp load circuit L110 is hanging. . (Oblique green = 3) The waveform of the figure, which exceeds the voltage value of the DC power supply 1 is connected to Ϊ =, which indicates that the discharge current of the discharge lamp load circuit L100 (discharge lamp 6 and parallel ceramic) to the first Λ capacity 7 passes through the two poles The body 30, the anode of the ancestral source 1 of the bypass w part, is shown in the waveform of the same figure, and the synthesized thunder part below the voltage vo indicates that the discharge lamp 6 and the capacitor 7 connected in parallel to it are bismuth two and pass through the two poles. The body 31 is bypassed to the negative pole of the DC power supply 1, and the eighth portion is a part where the waveform of the light-on capacitor 8 does not exist. In the same way, in the waveform of FIG. 3 (b), the slope of the voltage vd exceeds the slope: knife, which represents the combined current of the capacitor u of the discharge lamp 1 of the discharge lamp load circuit L110, which passes through the diode 32 and bypasses. To "= 1 of the eight positive poles" in the waveform of the same figure, the slashed part of the voltage below the voltage V0, indicates the discharge lamp 1 〇 and the capacitor connected in parallel 丨 丨 the person through the diode 33 ′ bypass to The negative pole of the DC power source 丨

D〇〇Oy / 5. Description of the invention (9) The waveform of the diode 3 〇 capacity 12 is omitted here. 〇! 〇0 〇〇 However, the voltage in the ton direction decreases. The discharge capacitor negative capacitance value i, L100, and LU〇 each coupling capacitor ⑶, C12 shape, respectively selected, 疋, become the waves shown in Figure 3 (&), (b) here Capacitance 7 is eight. By flowing to the discharge lamp 6, 10 and discharging the voltage in parallel, β is a current, and the coupling capacitors C8, Π 2 VD, $ ae, one half cycle, exceed the DC power supply. The voltage value of 1 is selected on the two half cycles of vn and does not exceed the amplitude of the voltage VO of the negative electrode of the DC power supply 1. < 1 Hereinafter, the operation of the discharge lamp lighting device according to the second embodiment of the present invention will be described with reference to Figs. 2 and 4. In FIG. 2, once the DC power is turned on, the discharge lamps 6, 10 of the switching elements 2, 3 are alternately driven at a high frequency by a start circuit (not shown) to achieve the effect of lighting. Here, once the discharge filament of the discharge lamp load circuit 10 of the discharge lamp load circuit L11 is connected to the discharge material on the side of the anti-current coil 9, it is consumed for reasons such as life, and is connected to the coupling capacitor 12 side. The discharge materials remain, and the discharge current of the discharge material is reduced in the half cycle of the consumed side. Therefore, the voltage 'of the coupling capacitor 12 decreases as shown in Fig. 4 (b). The voltage across the coupling capacitor 12 oscillates by the combined current flowing through the discharge lamp 10 and the capacitor 11, so this indicates that the combined current on the discharge cycle is reduced. Compared with the discharge of filament discharge materials and the normal situation, because the discharge lamp voltage increases, the current in the capacitor does not decrease, so the discharge lamp current decreases. Because the discharge lamp load circuit is ⑽ and discharge lamp 566057 a. Amendment V. Description of the invention (10) The load circuit Ll 10 is turned on to hide the ugliness of the load circuit even if it becomes negative as a discharge lamp; The frequency of vibration surplus does not change. That is, the lightning discharge of the filament of a discharge lamp 10 must be repeated, 々 > the period of lightning…… "consumption, the number of discharge lamps 10 does not change, and the vibration frequency life due to the repeated number of discharges In the final stage, it is possible to prevent the discharge lamp from becoming mismatched.产生 The circuit element added to the α motor 'produces fresh evening, explaining the case where the lamp of the discharge lamp connected to the anti-coil coil 9 =; = =, but the coupling side of the capacitor 12 connected to the transmission-pole body 33' The current flowing through the coupling capacitor 12, only the pole body 33, is bypassed on ((b), a line-symmetric waveform), and the lightning method of the discharge lamp, ^ 2 is the circuit element , Resulting in a mismatch. Reduce the number of 'can prevent in the circuit': 'According to this embodiment', even when the plurality of discharge lamp electrical circuits are changed to the same-to-conversion period formed by the switching element 2 and the switching element 3, p, month ' At the end of the life of the discharge lamp of a discharge lamp load circuit, the discharge of the normal discharge lamp is not affected, and the current of the discharge lamp can be reduced only in the selection period, which can prevent the generation of electricity on all parts. Mismatch. Embodiment 3 = 5 is a diagram showing a discharge lamp lighting device according to Embodiment 3 of the present invention. In this embodiment, the discharge lamp load circuit in Embodiment 2 is two. Page 14 2148-4835-PFl (N) .ptc 566057 Case No. 91109938_year and day repair, τ _ V. Description of the invention (11) Case, but in this embodiment, there are three discharge lamp load circuits. In the figure, the same or corresponding parts as those in the second figure of the second embodiment are denoted by the same reference numerals, and descriptions thereof are omitted. In the figure, L120 is the third discharge lamp load circuit with the same structure as the discharge lamp load circuit of L100, 17 is a current-resistant coil, 18 is a discharge lamp, 19 is a capacitor connected in parallel with the discharge lamp, 20 Are coupling capacitors, 34 and 35 are diodes. The one-to-two secondary coils 17a and 17b of the current-resistant coil 17 pass through the resistors 21 and 22 to alternately train the polarity of the switching elements 2 and 3 (illustration and symbol), and are connected to the gate. In this way, 'because the discharge lamp load circuit L120 shown in FIG. 2 of the second embodiment is connected in parallel with the discharge lamp load circuits L100 and Ln0', the operation is the same as that of the second embodiment. When the discharge material of the filament is consumed, the resonance frequency of the discharge lamp load circuit [100, L11 (), and L12O is approximately the same when it is turned on, so the oscillation frequency does not change. The discharge lamp 10 The current is reduced, and even if the discharge lamp has a life and a period, it is enough to stop on the circuit element, which causes mismatch due to the increase in current, etc., to obtain the same effect as in Example 2. However, the upper limit of the parallel connection number ^ Λ of the discharge lamp load circuit is not limited to 3, but may be 3 or more. Embodiment 4 Flute R Gang, the first time, the clothes show the discharge lamp lighting circuit according to Embodiment 4 of the present invention. Fig. 9 'and Fig. 7 are waveform diagrams of various parts of the circuit. In this embodiment, an embodiment in which a preheating timer (T i me) circuit is added to the embodiment ′ and Λ.

566057 V. Description of the invention (12) Figure 6 is the same as or equivalent to Figure 2 of Embodiment 2, and the same reference numerals are attached, and the description is omitted. 100 is a preheating timer circuit for setting the warm-up period of the filaments of the discharge lamps 6, 10. And in the preheating timing circuits 100, 50, and 51 are diodes connected to the anode on each of the current-resistant coils 5, 9 and 5b, 9b, and the cathode 2 is connected to the capacitor 52 connected together. One end. The other end of the capacitor 52 is connected to the negative pole of the DC power supply 1. The series connection of the resistor 53 and the capacitor 55 is called the capacitor 52. From the connection point between the resistor 53 and the capacitor 54, the Zener diode 55 is connected to the base of the NPN transistor 56 through the cathode of the Zener diode 55. The 55% pole of the carcass and the emitter of the transistor 56 are connected to the direct current ΓΓ59, 6 °, each of which is connected to the diode and is connected to the collector of the transistor 56. The emitter of H56, female body 57. 61 series base is connected to the collector of transistor 56-NPN transistor to the emitter of transistor 56, the collector is connected to the anode of electrode body 63, and Through the Zener diode 63-the back of the second cathode, and the anode of the diode 62 are connected: the first pole of the 62 pole. The operation of the discharge lamp lighting device of Example 4 will be described below with reference to Figs. 6 and 7 after being transported to the gate of the original switching element 3. The implementation of the 7th (ai) ^ month shows the 2M0SFE) diagrams during the warm-up timing and lighting period, each of which shows the same coil voltage during the warm-up period, the VCE voltage of the crystal 56, the same as the graph (cl), (C: Two: Electricity during the lamp period respectively indicates the period of the preheater. Page 16 2148-4835-PF (N), ahddub.ptd 566057 V. Description of the invention (13) ~-Lightning equipment during the period of lighting _ f; 1 night V $ 体 body 61 1 voltage, the same as (dl), (d2) in the figure δ k period and lighting period of M0SFET3 gate-source voltage. From the private 6 figure, once DC The power supply 1 is turned on, that is, by the taxi (not shown), Feng Shoumu drives the switching elements 2 and 3 in turn. At this time, the two of the 52 are upright, and each of them passes through the diode 50, 51, and the voltages of the secondary coils 5b and 9b of the reactance coils 5 and 9 are peaked. This voltage is charged to the capacitor 54 through the resistor 53, and the voltage charged here reaches Zener Before the sum of the Zener voltage of the diode 5 5 and the base of the transistor 5 6 • The forward voltage drop between the emitters, the transistor 56, OFF ° At this time, the anti-winding coil 5 and the secondary coil 5 of 9 b, 9b, on the negative half cycle, the resistance 59, 60 and the base of the transistor 61 are charged to a negative polarity. The charging voltage in this case is the forward voltage of the 5 γ of the diode. It is 0 · 6V. That is, the transistor 61 is turned off during the negative half cycle of the secondary coil. Then the voltage of the secondary coil 5 and 9 and the secondary coil 5 b and 9 b are reversed, and once they become positive In the half cycle, the capacitor 58 is charged through the resistors 59 and 60, and is charged with the opposite polarity to the negative half cycle. Here, the values of the resistors 59, 60 and the capacitor 58 are appropriately selected, as shown in Figure 7 (cl). As shown, at the time t1 before the secondary coil voltage reaches a positive peak value, the voltage of the capacitor 58 is even greater than the base threshold electric dust of the transistor 61. If the voltage of the capacitor 58 reaches the value of the transistor 61 The base critical value is 靥, and the transistor 61 becomes 0N. Because the diode 6 2 and the zener diode 6 3 pass through, the gate of the switching element 3 is switched.

2148-4835-PF (N), ahddub ptd page 17 566057-case number—91109938 car date modification _ 5. Description of the invention (14) " Current bypass, so the on time of the switching element 3 becomes shorter, and When the switching element 3 is OFF, the switching element 2 turns to 0N. Once again, once the voltage of the coil becomes negative half cycle, that is, the capacitor 61, the resistance 59, and 60 pass through, the base voltage of the transistor 61 is charged to a negative potential, so the transistor 61 becomes OFF °.

After that, these repetitions' are continued until the charging voltage of the capacitor 54 rises, and the transistor 56 becomes 0N (the state in FIG. 7 (b2)). That is, during the period when the transistor 56 is turned off, the number of oscillation frequencies of the converter circuit becomes larger, so the month b is enough to make the sharpness (or Q value) of the resonance of the discharge lamp load circuit operate in a small area, and During the period when the lamp is turned on, a large current flows through the k-wire, and at the same time, a large voltage is generated at both ends of the discharge lamp, which has the effect of preventing a so-called cold start. -However, the number of oscillating frequencies of the converter oscillating circuit during this period can be many, and it is set by appropriately selecting the Zener voltage of the Zener diode 63. The former ', once the thermal timing period has elapsed, the base voltage of the transistor 56 is bypassed ^ ON state, and the transistor 56 becomes ⑽, the transistor "has always been 0ff. However, the power supply to the transistor is The warm-up time period before 56 reaches 0N = the voltage 4 of the resistor 53, the capacitor 54, and the Zener diode 55 are appropriately selected and set.

As detailed above, according to this embodiment, from the time when the power is turned on to the time when the lamp is turned on, a large current flows through the filament, and at the same time, is generated on both ends of the discharge lamp. And press' to prevent the so-called cold start (c0d start). To select the voltage of the secondary coil 5 and 9 for the peak charging voltage, and obtain the operating power of the preheat timing circuit, so it can be cheap and small

566057

In addition, when all the discharge lamps are removed, if the DC power supply 1 is turned on, it will not operate, and unnecessary power loss can be prevented. However, in this embodiment, a description is given of a configuration in which the timing circuit is provided on the gate circuit of the switching element 3. The same effect can also be obtained on the gate circuits of both the switching elements 2 and 3. Example 5

Fig. 8 is a circuit diagram showing a discharge lamp lighting device according to a fifth embodiment of the present invention. In this embodiment, a protection circuit is added to Embodiment 4. In the figure, parts which are the same as or equivalent to those in Fig. 6 of Embodiment 4 are given a reference numeral, and descriptions thereof are omitted. 2000 is a protection circuit that protects a circuit that has increased current due to the life of the discharge lamp. On the protection circuit 200, 70 and 71 are resistors connected in series, and 7 anodes are connected in series with Zener diodes of resistor 71. These strings, capacitors, and capacitors 52 are connected in parallel. 73 is a gate fluid (thyristor) whose gate is connected to resistor 70 and resistance η = contact. Its cathode is connected to the switching element. The source ’anode passes through the cathode of diode 74 and is connected to the switching element.

Gate. From the anode of the brake fluid 73, a resistance 75 is transmitted through the < power supply 1 >. Proudly connected to Zhiluo below, with the operation of the lamp lighting device in Figure 8. The starting circuit is omitted to illustrate the reason for showing the fifth embodiment of the present invention. In the figure, once the power source 1 is turned on, the switching element is driven interactively at a high frequency.

2148-4835-PFl (N) .ptc page 19 566057 _ case number 91109938 V. Description of the invention (16) 2, 3. Here, once the discharge lamp load circuit L100 consumes the discharge materials of the filaments of the discharge lamp 6, and the discharge current decreases, that is, the equivalent impedance of the discharge lamp 6 increases, so the circuit of the discharge lamp load circuit 1100 The sharpness (or Q value) of the resonance increases, and the current flowing through it increases. When the power is turned on, from the end of the warm-up time until the discharge lamp 6 starts to discharge, the equivalent impedance of the discharge lamp 6 increases, so the resonance of the circuit of the load circuit of the discharge lamp is compared with that at the time of lighting. The sharpness (or Q value) becomes larger, and the current flowing through it increases, but if the damage such as rupture on the above, and the invasion of a from the outside air, it may not be able to reach the normal electric lamp. And this situation continues. However, continued operation in such a state has problems of power loss and deterioration of circuit components. If the sharpness (or Q value) of the resonance of the discharge lamp load circuit L100 becomes large, compared with the time of normal lighting, a large voltage can be obtained at both ends of the choke coil 5, and the secondary coil "" It is also obtained that the large voltage it is at both ends of the capacitor 52 after the peak charging. Compared with the normal lighting, a large voltage can be obtained. Therefore, the voltage of the inner pole body 72 is properly selected so that the sluice fluid 73 is F when the lamp is normally lit, and for the band # 炕, which is the discharge substance, in the lamp turn of the discharge lamp 6, When the voltage of the capacitor 52 obtained when the abnormal discharge lamp 6 is installed is set to 0N, the current t 2 is switched to flow through the diode 74 and the gate fluid 73, so that the oscillation stops. On the brake fluid 73, the DC power supply 1 passes through the resistance 7 5 to protect the battery from thunder and cold, and Zheng Xiyi + a & holding power, "L machine has passed, so before blocking the DC power supply 1, Sadness is kept. Gan Gan ,, 1 & Dwarf Rune. Other operations are the same as those of the fourth embodiment. Preheat meter day guard circuit 100 two-pole r 1 bit body 50, 51 and capacitor 52, for preheating timer

Page 566057

The driving power of the correction circuit 100 is also the output device of the lighting state of the discharge lamp 6, i0. ^ As described above, according to this embodiment, the installation of a faulty discharge lamp at the end of the life of the discharge lamp due to the consumption of the discharge substance of the filament of the discharge lamp or the rupture of the discharge tube, etc., continues to operate in this state. In this case, since the oscillation of the converter circuit is stopped, it is possible to prevent unnecessary power loss or deterioration of circuit components. However, in this embodiment, the case where two discharge lamp load circuits are connected in parallel is explained, but even for two or more discharge lamp load circuits connected in parallel, + the addition of new components can also obtain the same [Effect of the Invention] Regarding the source, a pair of currents having an inverter is used to discharge the discharge, in which the lamp and the capacitor that consume electricity are combined; a pair of switching voltages of the parallel current-resisting line are used to interact in the load circuit. The discharge lamp lighting device of the present invention is provided with a converter circuit formed by converting a direct current supplied from the direct current power source into a half-bridge circuit of a high-frequency switching element, and a converter circuit A discharge lamp lighting device for a plurality of discharge lamp load circuits of a frequency lamp lighting circuit. The discharge lamp load circuit includes a current-proof coil, a series circuit of a discharge valley, and a pair of discharge lamps connected in parallel to each of the discharge lamps. Each of the above discharge lamp load coils is connected in parallel to the 2 夂 coil of the upper part through the respective current limiting element, so as to output from the above secondary coil. Soil driving the pair of switching elements, so that the discharge lamp even if the complex is removed at least one of the discharge lamp, the discharge lamp remaining negative) 66057

Even if the circuit is large, the φ & large call lamp can also be installed with the same discharge lamp current as the multiple discharge lamps ^ φ, the same discharge lamp current can be used to light, without the need to drive a dedicated CT that is converted into a circuit switching element, And can be miniaturized. The section also has a connection point from the connection point of each discharge lamp and the coupling capacitor to the positive and negative diodes of the direct = 1 source. At the normal point of each of the above discharge lamps, \ KXjC port Taiben 1 ^ 'The current alternately flows to the power supply during each half cycle of the vibration surplus' to determine the capacitance values of the aforementioned coupling capacitors, so the discharge current is reduced or reduced due to the consumption of the discharge substance of the discharge lamp $ lamp 4. In the positive and negative periods of the discharge, even if the asymmetry of the discharge current in one cycle is reduced, it does not increase the current flowing to the load circuit of the discharge lamp, which is sufficient to prevent mismatches on the circuit elements due to the increased current. ^ Make the resonance frequency of the load circuit of the multiple discharge lamp approximately the same. Therefore, in the multiple discharge lamp load circuit, even if more than one discharge lamp is removed, the discharge lamp of the discharge lamp load circuit remains, It can be turned on with the same discharge lamp current as when the discharge lamp is completely installed. At the same time, the discharge current is reduced due to the consumption of the discharge substance of the filament of the discharge lamp, or it occurs during the positive and negative periods of the discharge. One side cycle = asymmetrical phenomenon of reduction of electric current, or the installation of Chapter 1 ^ discharge lamp due to rupture of the discharge tube, etc., increases the current flowing to the load circuit of the discharge lamp, and can prevent the circuit due to the increase of current There is a mismatch on the component. First, when the discharge lamps are normally lit, the voltage of the secondary coils of the plurality of anti-current coils of the switching elements of the drive converter circuit is determined approximately the same. Therefore, when the discharge lamps are normally lit, the In the discharge lamp load circuit, even if more than one discharge lamp is removed, the discharge lamp load circuit remains

2148-4835-PFl (N) .ptc Page 22 566057

Case No. 91109938 V. Description of the invention (19) The discharge lamp 'can also be lit with the same discharge lamp current as the plural discharges. At the end of the life of the discharge lamp which is approximately equivalent to the discharge when it is fully installed and installed at 70, The installation condition of the discharge material of the filament of the lamp is the follow-up of the obstacle-free discharge lamp or the oscillation due to the rupture of the discharge tube, etc., which can prevent the operation due to the current two and can stop the converter circuit. On the circuit components of the safety device, an inexpensive protection circuit that does not match the new components can be added, and it can also have a structure of phenoxide without additional addition. It is also equipped with the electric coils of the secondary coil of the drive converter, each of which passes through a diode knife and 70 pieces of multiple anti-current coils, as the drive power supply / connection or (wired 0Γ) resistance wiring. After or (wired 〇Γ): m passes the power supply voltage through the preheating timer II of the control signal of the electric time, just after the DC power supply 1 is turned on, and after the converter circuit is started, it is warmed up in advance with a timing period of 疋After that, the discharge of the discharge material and the discharge lamp wall became black.彳 丨, 糸, 糸, and 具备 are equipped with the secondary coil that will drive the switching elements of the converter circuit, the secondary coil, through the respective diodes to make wiring or or) the voltage obtained, When the value determined in advance is large, the oscillation protection circuit of the switching element of the converter circuit is stopped, so at the end of the life of the discharge lamp, such as the consumption of the discharge substance of the filament of the discharge lamp, or due to the burst of the discharge tube Continued operation in the installed state of the fault discharge lamp 'can stop the oscillation of the converter circuit, and can prevent mismatches on the circuit elements due to the increase in current, and at the same time, even if the number of installation of the discharge lamp increases, there can be no additional Construction of cheap protection circuits for new components

2148-4835-PFl (N) .ptc Page 23 566057 V. Description of the invention (20) Make 0 i ΙΙΙΗΙ 2148-4835-PF (N); ahddub.ptd Page 24 566057 Simple illustration of the drawing ~ Picture 1 A circuit diagram showing a discharge lamp lighting device according to the first embodiment of the present invention. Fig. 2 is a circuit diagram showing a discharge lamp lighting device according to a second embodiment of the present invention. Figures 3 (a) and (b) are waveform diagrams for explaining the operation of the discharge lamp lighting device according to the second embodiment of the present invention. Figures 4 (a) and (b) are waveform diagrams for explaining the operation of the discharge lamp lighting device according to the second embodiment of the present invention. Fig. 5 is a circuit diagram showing a discharge lamp lighting device according to a third embodiment of the present invention. Fig. 6 is a circuit diagram showing a discharge lamp lighting device according to a fourth embodiment of the present invention. The 7th (al), (a2), (bl), (b2) > (cl), (c2), (d1), (d2) are diagrams for explaining the discharge lamp point of the fourth embodiment of the present invention Waveform diagram of the operation of the lamp device. Fig. 8 is a circuit diagram showing a discharge lamp lighting device according to a fifth embodiment of the present invention. Fig. 9 is a circuit diagram showing a conventional discharge lamp lighting device. Fig. 10 is a circuit diagram of a DC power supply of a conventional discharge lamp lighting device. [Symbol description] 1 ~ power supply; 2,3 ~ switching element; 5,9,17 ~ current-resistant coil;

2148-4835-PF (N); ahddub.ptd Page 25 566057 Case No. 91109938 Amends the diagram briefly to explain 5a, 5b, 9a, 9b, 17a, 17b ~ 2 secondary coils; 6, 10, 18 ~ discharge lamps; 7, 11, 19 ~ capacitors 8, 12, 20 ~ capacitors; 13, 14 ~ resistors; 15, 16, 21, 22 ~ resistors; L100, L110, L120 ~ discharge lamp load circuits; 30, 31, 32, 33 ~ Diodes; 3 4, 3 5 ~ diodes; 52 ~ capacitors; 54 ~ capacitors; 5 6,6 1 ~ transistors; 58 ~ capacitors; 100 ~ preheating timing circuit 7 2 ~ zener diodes; 7 4 ~ diode; 1 0 0 ~ protection circuit. 50, 51 ~ diodes; 53, 59, 60 ~ resistor 5 5 ~ zener diode 5 7,6 2 ~ diode 6 3 ~ zener diode 7 0,71 ~ resistor; 73 ~ gate Fluid; 75 ~ resistance;

2148-4835-PFl (N) .ptc Page 26

Claims (1)

566057 ί · A discharge lamp lighting device, including: a DC power supply; a direct switching: (= rter) circuit 'by switching from-, earth = 2 to one of the south frequency current switching provided by the DC power supply element. A half-bridge circuit (half bridge); and = a discharge lamp load circuit, the discharge lamp is turned on by a high-rate electric k from this converter circuit; / characterized by: the above-mentioned discharge lamp load circuit , Including a series circuit of a choke coil, a discharge lamp, a coupling capacitor, and a capacitor connected in parallel to the discharge lamp; ^ * and each pair of It is arranged on the anti-current coil of each discharge lamp load circuit, and is connected in parallel to the secondary coil of the pair of switching elements through their respective current limiting elements; and the output voltage from the secondary coil is used to alternately The aforementioned pair of switching elements are driven. 2. The discharge lamp lighting device according to item 1 of the scope of patent application, which includes a diode (diode) connected to the positive and negative poles of the DC power source from the connection point of each discharge lamp and the surface-capacitor. During the normal lighting of each of the above discharge lamps, through the diodes, currents are alternately flowed to the power source on each half cycle (cyc 1 e) of the oscillation to determine the capacitance values of the aforementioned coupling capacitors. 3. The discharge lamp lighting device according to item 1 or 2 of the scope of patent application, wherein the resonance frequency of the load circuit of the plurality of discharge lamps is made substantially the same. 2148-4835-PF (N), ahddub.ptd page 27 566057 6. Scope of patent application Decide it. 4 · The discharge lamp lighting device as described in item 1 or 2 of the scope of patent application, wherein when the discharge lamps are normally lit, the voltage of the secondary coil of the plurality of anti-current coils of the switching elements driving the converter circuit is driven. It's about the same, decide it. & 5 · The discharge lamp lighting device described in item 1 or 2 of the scope of patent application, which includes a pre-heating timer (ti mer), which will drive the secondary coil of the plurality of anti-current coils of the L 'element of the converter circuit , Each through a diode to change the voltage obtained by wiring or (wired or), as the driving power supply voltage as the power supply voltage through the resistor for wiring or (wired 0r) and then used to control the converter The switching element of the circuit is controlled at 0N time, No. 0, 6 spoons in J 1 =, the discharge lamp lighting lamp described in item 1 or 2 of the patent scope, and the protection circuit is set to convert the drive: Set (wlred or) the obtained voltage to make wiring or stop the switching of the above converter circuit = with a large value '