TW554644B - Discharge lamp lighting up device - Google Patents

Abstract

The object of the present invention is to provide a discharge lamp lighting up device capable of installing plural kinds of discharge lamps having substantially same rated current but different rated output powers. The solution of the present invention comprises an inverter circuit for converting DC supplied from a DC power 1 into high-frequency current; plural discharge lamp load circuits for lighting up the discharge lamps by the high frequency current from the inverter circuit, each discharge lamp load circuit having choke coils 5 and 9, discharge lamps 6 and 10, coupling capacitor 8 and 12 and a capacitor; a frequency-voltage conversion device 100 for converting the output voltage for driving the secondary coils 5a, 5b, 9a and 9b of a pair of switching devices 2 and 3 from each one pair of the choke coils 5 and 9 arranged on the discharge lamp load circuit into the DC voltage corresponding to its oscillation frequency; and a control device 101 for using the output of the frequency-voltage conversion device 100 as a standard to change the oscillation frequency of the switching devices 2 and 3, thereby controlling the current of the discharge lamps 6 and 10.

Description

554644 V. Description of the invention ο) ~ [Technical field to which the invention belongs] The present invention relates to a discharge lamp device for a discharge lamp that lights a plurality of discharge lamps with high-frequency power from a self-excited converter circuit. ， = It is related to a lamp lighting device capable of installing a plurality of types of discharge lamps with rated currents that are approximately equal to each other with one discharge lamp lighting device. [Conventional Technology] Fig. 8 is a circuit diagram of a conventional discharge lamp device. In the figure, the DC power source obtained from a commercial power source, 2 and 3 are switching elements composed of a converter circuit and a MOSFET, 5 is a choke coil, 6 is a discharge lamp, and 7 is The capacitors connected to the discharge lamp 6 in parallel, 8 are coupling ... capacitors, these constitute the discharge lamp load circuit L100. [110] has the same structure as the discharge lamp circuit UOM, and is connected in parallel to the discharge lamp load circuit of the discharge lamp load, and is composed of a current-resistant coil 9, a discharge lamp 10, a capacitor 11, and a coupling capacitor 12. 4 is a current transformer (hereinafter referred to as CT) connected to the connection point of the two switching elements 2 and 3 and the connection point of the parallel circuit of the discharge circuit L100 and LU0. The secondary coils 4a and 4b are as shown in the figure. The pole of the symbol shown = N / with the drive switching elements 2, 3, and through each of the obstructions 13, 14, it is connected to the gate and source (s) of the above-mentioned cut-change elements 2, 3. 〇urce) the two masters-the combination of the primary coil and secondary coil of CT4, which is shown in the figure with a dashed line. ） ， The figure omits the equivalent diode that is built in parallel between the drain and the source of the switching element 3 in parallel

2148-4882-PF (N); ahddub.ptd Page 5 554644 V. Description of the invention (2) The second circle diagram: also f: the start circuit for starting the converter. As shown in the figure, the T manufacturer has two sources that are straight one ^ Full-wave rectification with bridge diode 113; Use: 1: 1: "Out of AC power source" to be a DC power source = Electricity: T sliding capacitor lc To smooth the 'while μ if build' Γ Once the DC power supply 1 is put in, that is, by omitting the illustration and the circuit, the discharge lamps 6, 10 of the switching elements 2, 3 are driven alternately at a frequency of 鬲, so as to light up The effect.

[Problems to be Solved by the Invention] However, in a conventional discharge lamp lighting device, two discharge lamps 6 10 ′ are equal to or equal to each other ’s discharge current from the rated output power.

In the case where a different type A is replaced and installed as type b, as shown in the operation explanatory diagram of FIG. 3 (a), the discharge lamp 6 and 10 are replaced and installed from type a to β, so that the discharge lamp is replaced. The voltage at both ends of 6, 10 decreases, and with this decrease, the current flowing through the anti-coil coils 5, 9 increases, and the current through the CT4 of the combined current of the two anti-coil coils 5, 9 also increases. Once the current flowing through CT4 increases, the voltage of the secondary coils 4a and 4b increases. Compared with the frequency (fA) when a type A discharge lamp is installed, the lamp is lit at a lower frequency (fB), and the discharge lamp The power is increased from rated power (WLBT) to power (WLB). That is, a type A discharge lamp having a high rated voltage of the discharge lamp is mounted on the discharge lamp lighting device, and in this state, the rated power (WLAT) is set to the optimum condition (WLAT and WLA— (Cause), the rated current of the discharge lamp is about the same, and once the rated output power is different

2148-4882-PF (N); ahddub.ptd Page 6 554644 Description of the invention (3) Type B discharge lamp (WLBT), the current of the discharge lamp increases from IU to Iu, so there is a rating that exceeds the type B discharge lamp Problems with the dynamics of power (WLBT). Except for the replacement of the discharge lamp, when the discharge lamp in either of the discharge lamp 6 or the discharge lamp 10 is removed, the current flowing through CT4 is reduced, so the frequency is compared with the case where all two lamps are installed. It increases, and there is a problem that the output power of the discharge lamp of the other party also decreases. The present invention was invented in order to solve the above-mentioned problems of the conventional device. The i-th object of the present invention is to provide a lamp that can be installed more than one, and can be installed with approximately the same rated current, and the rated output power is different. A discharge lamp lighting device for a plurality of types of discharge lamps. A second object of the present invention is to provide a discharge lamp lighting device that is installed from a plurality of discharge lamps and retains at least} lamps, and removes the remaining discharge lamps and the remaining discharge lamps. The discharge lamp lighting device with substantially the same output power as in the case of full installation [means to solve the problem] The discharge lamp lighting device of the present invention includes: DC. Converter smart circuit, It is composed of a half-bridge type circuit that converts the direct current supplied from the above-mentioned direct current power source into a pair of switching elements of south frequency current; and a plurality of discharge lamp load circuits, which are precisely composed of the high frequency from this converter circuit A current causes the discharge lamp to light; wherein the above-mentioned discharge lamp load circuit includes a current-resistant coil and a discharge lamp

554644 V. Description of the invention (4) / Combining capacitors with a string of smart & „VI. The connected circuit is connected to the electricity connected to the above discharge lamp in parallel; the bin: secondary coils, each-a pair of which are set at each of the above discharges On the above-mentioned current-resistant coil of 21, through the respective current-limiting elements, they are "quoted to" the pair of switching elements, and the output drives the pair of switching rate-voltage conversion devices. Transform to a DC voltage corresponding to its oscillating frequency; and control settings to control the current of the discharge lamp by changing the oscillating frequency of the switching 7L component based on the output of the frequency-voltage conversion device. The power supply of the voltage conversion device is the output voltage of the secondary coil, and it is provided with a voltage stabilization device that stabilizes the voltage. The smaller the oscillation frequency of the converter oscillation control, the larger the output of the frequency-voltage conversion device. When a discharge lamp with a small rated output power is installed, the current of the discharge lamp is suppressed. A voltage output from a frequency-voltage conversion device is also provided to reduce the voltage. A voltage reduction device that first determines a value. [Inventive Embodiment] Embodiment 1 Fig. 1 is a circuit diagram showing a discharge lamp lighting device according to Embodiment 1 of the present invention, Fig. 2 is an explanatory diagram of operation waveforms, and Fig. 3 is The operation characteristic diagram of the discharge lamp lighting device of Example J and the operation characteristic diagram of the conventional example are compared. In the figure, 1 is a DC power source obtained from a commercial power source, and 2 and 3 are switches formed by MOSFETs constituting a converter circuit. Element, 5 is a current-resistant coil, 6

554644 V. Description of the invention (5), the discharge lamp, 7 is a capacitor connected in parallel to the discharge lamp 6, and 8 is a coupling capacitor. These constitute a discharge lamp load circuit L100. [110] has the same structure as the discharge lamp negative circuit L100, and is a discharge lamp load circuit connected in parallel to the discharge lamp load circuit L100, and is composed of a current-resistant coil 9, a discharge lamp 10, a capacitor 11, and a coupling capacitor 12 To constitute. On the anti-current coils 5 and 9 of the discharge lamp load circuits Lioo and L11〇, each of them is set; the secondary coils 5a, 5b, 9a, and 9b are as shown in the figure with the polarity of the symbol. The ON / OFF switching elements 2 and 3 are driven alternately, and the over-resistors 13 and 15 and the resistors 14 and 16 are connected between the gate sources. (In order to show the combination of each of the i-th coils of the current-resistant coils 5 and 9 and each of the secondary coils 5a, 5b, 9a, and 9b, dashed lines and dashed lines are shown in the figure.) However, 'omitted' is included in parallel The drain and source of switching elements 2 and 3; equivalent diodes. The start-up circuit for starting the converter is also omitted in the figure. 100 is a frequency-voltage conversion yv conversion circuit that converts the oscillating frequency to a DC voltage, and 101 is to control the discharge lamp by changing the oscillating frequency of the switching elements 2 and 3 by using the output of the Η conversion device 100 as a reference. 6, 0 control circuit of the current control device. = „On the road 100, 50 and 51 are anodes connected to the current-resistant coils 5 and 9 乂 coils 5b and 9b, and the cathode is connected to one end of the capacitor 52 and the other end of the valley 52 is connected to the DC power supply 1 The other end of the cathode of 53 connected to the diode 50 is connected to the resistance of the cathode of the voltage ^, the Zener 54, and the anode of the Zener 54 is connected to a DC power source! Negative I. 5 5 is connected in parallel on page 9 2148-4882-PF (N); ahddub.ptd 554644 V. Description of the invention (6) Capacitance of nano-diode 54, 57 and 58 are connected to one end The other end of the secondary coil 5b, 9b of the current-resistant coil 5, g is connected to one end of the resistor 56. The other end of the resistor 56 is connected to the negative electrode of the DC power supply 1. 5 9 is an NPN transistor, and the emitter is Connected to the negative electrode of the DC power source, the base is connected to the connection point of the resistor 56 and the resistor 57, and the collector is connected to the cathode of the Zener diode 54 through the resistor 60. 61 is the set connected to the transistor 59 Capacitor (c0nector) and emitter (emitter), 62 is an operational amplifier (hereinafter referred to as 0P AMP), its non-inverting input terminal Connected to the collector of transistor 59, the inverting input terminal is connected to the cathode of diode 63. The output of OP AMP6 2 is connected to the anode of diode 63. 65 is the cathode connected to diode 63. Capacitance between the negative pole of DC power supply 1. In the control circuit 101, 67 is a resistor connected in parallel with capacitor 65. 69 is a variable 3-terminal regulator (regulat〇r), 68 is connected to a variable ^ terminal regulator The resistance between the inverting input terminal (REF terminal) and the cathode of the device 69, 70 is the resistance connected at one end to the cathode of the variable 3-terminal regulator 69, and the other end is connected to the switch through the cathode of the diode 71 The gate of element 3. The variable 3-terminal regulator, for example, corresponds to the Hitachi HA1 743 1 series. The following describes the discharge lamp lighting of the first embodiment of the present invention with reference to FIGS. 1 and 2. The basic operation of the device. Figure 2 & shows the voltage of the capacitor 61 when the oscillation frequency is small, and the same figure (b) shows the voltage corresponding to the capacitor 65 in the same figure (a), and the same figure (c) The voltage of the capacitor 61 is shown in the case of a large oscillation frequency. The voltage of the capacitor 65 is the same as in Figure ⑷. Figure 3 (a) shows the operation of the discharge lamp lighting device of the conventional example 2148-4882-PF (N); ahddub.ptd Page 10 554644 V. Description of the invention (7 ) Characteristic diagram 'The same figure (b) is an operation characteristic diagram showing the discharge lamp lighting device according to the first embodiment of the present invention. In the first diagram,' once the DC power supply 1 is turned on, the starting circuit is omitted. ' The discharge lamps 6, 10 of the switching elements 2, 3 are alternately driven at a high frequency to achieve the effect of lighting. At this time, on the fV conversion circuit 100, the voltages of the secondary coils 5 and 9 of the anti-coil coils 5 and 9 pass through the diodes 50 and 51 respectively to peak the two ends of the capacitor after charging, Get the voltage. This voltage is charged to the capacitor 55 through the resistor 53. At this time, the stabilized voltage is charged to the capacitor 55 by the Zener diode 54. On the other hand, on the base of transistor 59, a voltage of positive and negative phase inversion per half cycle generated on the secondary coils 5b and 9b of the anti-current coils 5 and 9 is applied. Therefore, the transistor 59 is turned on every half cycle. · OFF. As a result, during the period of the transistor 59 0 =, the voltage of the capacitor 55 as shown in FIG. 2 (a) is obtained at both ends of the capacitor 61, and a triangular wave integrated with the resistor 60 is obtained. The peak voltage of the triangular wave becomes larger when the period of the transistor 59 is longer, and when it is shorter, it becomes smaller as shown in FIG. 2 (c). That is, when the oscillation frequency of the converter obtained from the secondary coils 5 b and 9 b is small, the peak value of the voltage of the capacitor 61 becomes large as shown in FIG. 2 (a), and the oscillation frequency is large. Next, it becomes smaller as shown in FIG. 2 (.). The peak value of the voltage of the capacitor 61 was measured with 0p AMP62 and the diode 63. Therefore, at both ends of the electric valley 65, a DC voltage corresponding to the peak voltage of the triangular wave of the capacitor η was obtained. Part 2 (a) On the third wave of Figure 2 and Figure 2 (c), they correspond to (b) and (d), so on capacitor 65, we get the corresponding to

2148-4882-PF (N); ahddub.ptd p. 11 554644

DC voltage at oscillation frequency.

On the control circuit 204, the resistance 65, 6 converts the capacitance 65 of the circuit 100 to the oscillating frequency, so that the '69 sub-V is not activated, and the 3-terminal regulator 69 is activated when the oscillation frequency is low and the voltage is high. With the selection of the resistance 70, the tangent element = the current 'through = the diode 71 and the resistance 7. 3. The variable 3-terminal Bypass can be used to change the duration of the switching element 3, so that the vibration and frequency of the converter circuit can be changed to control the current flowing to the discharge lamp. Next, the operation of the case where the rated currents of the discharge lamps are approximately equal, and the two discharge lamps 6 and 10 are replaced with eight types with different rated output power and installed as type B will be described with reference to FIGS. 1 and 3. . Fig. 3 shows a case where the rated voltage of a type A discharge lamp is high and the rated voltage of a type b discharge lamp is low. First, the outline of this operation will be described with reference to FIG. 3. As shown in FIG. 3 (a), the conventional discharge lamp lighting device, once the discharge lamp is replaced from type A to type B, is compared with the frequency (f A) when a type of discharge lamp is installed. To light at a low oscillation frequency (f β), while the lamp current is increased from ILA to ILB, and the power (WLB) of the discharge lamp B is increased from the rated power (WLBT), but the discharge lamp is turned on in this embodiment The device uses the fV conversion circuit 100 and the control circuit 101, as shown in FIG. 3 (b), the oscillation frequency (fB) of the type B discharge lamp B increases, and the discharge lamp current (ILB) decreases, and the sum thereof The type A discharge lamp A has the same oscillation frequency (fA) and discharge lamp current (fLA), so that the power (WLB) of the discharge lamp B does not increase from the rated power (WLBT). Next, it will be described in detail. However, set each discharge lamp load circuit

2148-4882-PF (N); ahddub.ptd Page 12 554644 V. Description of the invention (9) The resonance frequencies when lighting L1 0 0 and L1 1 0 are approximately equal, and the current-proof coils are set when lighting The voltages of the secondary coils 5a, 5b, 9a, and 9b of 5, 9 are approximately equal. Once the discharge lamp with a lower rated voltage is replaced, the oscillation frequency of the converter circuit becomes smaller, and a higher voltage is obtained at both ends of the capacitor 65 of the f-conversion circuit 100. Here, the resistors 68 and 67 and the variable 3-terminal regulator 69 are appropriately selected so as not to operate at the high frequency at which the discharge lamp A is installed, but to make the cathode only at the low frequency at which the discharge lamp 8 is installed. Set the voltage drop. The resistor 70 is appropriately selected, and once the gate current of the driving switching element 3 is bypassed through the diode 71, the resistor, and the variable 3-terminal regulator, the ON period of the switching element 3 becomes short. That is, because the oscillation frequency is changed #, an increase in the discharge lamp current when the discharge lamp 6 is replaced by the discharge lamp 6 is suppressed (ilb in (3b)). H = f makes the discharge lamp power (LB in Figure (3b)) when it is installed as the discharge lamp 8 become its rated output power (wlbt) for the fV conversion circuit 100 枳, with μ ^ ^ ^ 2 β «7η DC output voltage characteristics and frequency of oscillating frequency? The installation of the two discharge lamps A or the discharge lamp is irrelevant, and the light is output with the output power corresponding to the amount of output power. As described above, it is possible to install a plurality of lamps with a constant current approximately, and rated = f denier.疋 Turn out multiple types of discharges with different powers. • Here, under 2 discharge lamps 6,] 〇 Xi meat, must produce people, remove any -fangqing discharge under the lightning connected to the left. Secondary line of the anti-current coil of the lamp circuit

554644 V. Description of the invention (ίο) On the circle, the same voltage is generated at the same frequency as before the removal, t is sufficient to light the lamp under the same conditions as when all two lamps are installed. Therefore, even when the remaining lamp is replaced and installed as another type of electric lamp, the two coils connected to the current-resistant coil of the remaining discharge lamp circuit are generated corresponding to the discharge lamp after the replacement installation. The frequency of electricity is _, so it has the same effect as the case where all 2 lamps are replaced and installed. … And: I drive the voltage generated on 70, 2, 3, and 2 coils of the anti-current coils installed in the load circuit of each discharge lamp to turn it; the direct-current electric ignition of the surplus frequency " Electricity of the conversion circuit: A single structure can be used to obtain the power of the ， conversion circuit. If the current of the circuit ITO is not the same as that of the electric motor, the current at the time of the discharge lamp of the f_v conversion type is equal to: Install the rated output. Electricity ^ Lamp current becomes maximum. ; The smallest placed circuit components of the thunder * ', cattle on' If you confirm the conditions of the discharge lamp installation and other conditions in advance milk m 'put: the measured characteristics of the temperature of the lamp lighting device, turn three ^ The larger the measured voltage of the oscillation frequency of the converter oscillation circuit, the smaller the oscillation frequency of the surplus circuit, the smaller the oscillation frequency of the t-lamp oscillation circuit of the discharge lamp obtained, because of the opposite characteristics. That is, it works in the direction of the flow, so the characteristic of f-V is that the rated output power and the current of the lamp increase, and it is suitable for the discharge lamp barrier mode. War is a safe device.

Ptd 2148-4882-PF (N); ahddub. Page 14 554644 V. Description of the invention (11) Embodiment 2 FIG. 4 is a circuit diagram showing a discharge lamp device according to Embodiment 2 of the present invention, and FIG. 5 is an operation waveform Illustrating. In the figure, the same portions as those in the first figure of the first embodiment are denoted by the same reference numerals and their descriptions are omitted. 80 is a Zener diode of a newly added voltage reducing device whose cathode is connected to the collector of transistor 59, and whose anode is connected to the non-inverting input terminal of OP AMP 62. 〆 The operation of the discharge lamp lighting device according to the second embodiment of the present invention will be described below with reference to Figs. 4 and 5. Figure 5 (a) shows the voltage of capacitor 61 when the conversion coefficient is small, as shown in Figure (c). The voltage of capacitor 61 when the conversion coefficient of the v-transformation circuit is large is the same as Figure (b). The voltages corresponding to the capacitors 65 in the same figure (&) ((:). "In the fourth figure, once the DC power is applied, the switching element is driven at a high frequency alternately by a start circuit (not shown). 2, 3, to achieve the effect of a point discharge lamp. Once different types of discharge lamps are replaced and installed ', the oscillation frequency is changed as described in Embodiment 1. If the change in oscillation frequency is taken as △ f, taking the output change of fV conversion circuit 100 thus obtained as Δν, and the conversion of f-v conversion circuit 100 as Δν / Δί, the larger the conversion coefficient, the more the output voltage field changes with frequency change. Larger, and the larger the different types of discharge lamps can be when they are replaced. Μ ~ β Therefore, if the values of resistor 60 and capacitor 61 are appropriately selected, the characteristics of the 5 ^ a) diagram become the characteristics of Fig. 5 (c). The transformation coefficient becomes larger, and for the f_v transformation circuit of the same frequency 1 〇〇The absolute output voltage

2148-4882-PF (N); ahddub.ptd Page 15 554644 5. Description of the invention (12) ~ ----- The value of the pair has also increased. However, the voltage of the inverting input terminal built in the variable 3 terminal is fixed. Therefore, if a Zener diode 80 is added for "non-voltage VZD '", the electric coefficient Δν will be maintained as in the fifth. / Δί becomes large, and the same voltage can be obtained. As described above, according to this embodiment, since the transform coefficient that can be made larger, it is possible to enhance the capability of different channels. Distinction of long-time electric lamps Even if instead of the variable 3-terminal regulator 69, when using an AMP, there are restrictions on its input terminals, so the same effect can be obtained with the Zener diode 80. Fig. 6 shows the implementation of the present invention. Fig. 7 is an explanatory diagram of operation waveforms. The circuit of 1 device " Figure 6 " is the same as that of Figure 1 of the first embodiment, and the same number is attached, and the description is omitted. Reference numeral 81 is a cathode connected to a unipolar anode, a cathode, and an anode connected to an inverting input terminal of a variable 3-terminal regulator 69; a newly added voltage-reducing Zener diode. Below the inverting input voltage, use the operation of the discharge lamp lighting device in Figure 6 and 7 as shown in Example 3 • Daily watch strict version-the thunder of the case where the conversion coefficient of the implementation path of the invention is small / 7 ( &) The figure shows that the ¥ conversion electricity corresponds to the voltage of the capacitor 65/61 of the same figure (a). The same figure shows the case where the transformation coefficient of the road is large. Corresponding to the electric capacity of the capacitor 65 in the same figure: 1 ® (d) means change, the same figure (e) means that the

2148-4882-PF (N); ahddub.ptd Page 16 554644 V. Description of the invention (13) (d) The voltage on Zener diode 81 when it is cut off by Zener diode 81 . In FIG. 6, once the DC power supply 1 is turned on, the switching elements 2 and 3 are alternately driven at a high frequency by a start-up circuit '(not shown), so as to light up the discharge lamp. Here, once the different types of discharge lamps are replaced, the oscillation frequency is changed as described above. And as explained in the actual β embodiment 2, once the conversion coefficient AV / Af of the fv conversion circuit 100 becomes larger, the absolute value of the output voltage of the fV conversion circuit 100 at the same frequency is as shown in Figure 7 (b) to It is increased as shown in Fig. 7 (d). However, the purpose is to be fixed in the non-inverted = terminal voltage 疋 fixed in the variable 3-terminal regulator 69, so if the Zener voltage is maintained, and the back-up diode 81 is added, it is as in Section 7 (d). The conversion coefficients Δ V / Δ f shown in FIG. 7 and FIG. 7 (e) become larger, and _ leopard | also goes to the inverting input terminal of the variable 3, 钿 子 调 器 69. For example, the above is because according to this embodiment, f-v can be transformed into a lightning capability. "" Enough to distinguish between different types of discharge lamps

And even in the case of replacing the variable 3-terminal regulator ㈢ AMP, because the wheel uses more 〇P, enough to insert the Zener diode 80, there are restrictions on it, so it can still be served. The same effect. [Effects of the Invention] The present invention is effective because it is clearly constructed as shown by t %% '

554644

The effect shown below. Because it contains the discharge lamp current from the above-mentioned pair of switching elements, each discharge element of the discharge coil and discharge lamp discharge lamp is described by the output of the pair of switching coils, straight, L power, converter ( Inverter) circuit, which is a half bridge circuit that converts the direct current supplied by a direct current power source into a high-frequency current ^, and a complex load circuit that turns on the high-frequency electric lamp from this converter circuit ; The discharge lamp load circuit includes: a series circuit of an anti-current line, a coupling capacitor, and a parallel connection to the valley, and includes: a secondary coil, each pair of which is provided on the above-mentioned current-resistant coil of the load circuit of the lamp, Connected to the above pair of switching elements in parallel through their respective limits, and output the voltage of the driving element; the frequency-voltage conversion device converts the secondary voltage from this time to a DC voltage corresponding to its oscillation frequency; and the control device, by Based on the output of the frequency-voltage conversion device as a reference, 'the vibration frequency of the switching element is changed to control the current of the discharge lamp', so that A lighting device mounted to a plurality of rated current is substantially equal, and the rated power output of a plurality of different types of discharge lamps. Even if one of the plurality of discharge lamps is removed, the remaining discharge lamps can be maintained at the same discharge lamp current as when all the discharge lamps are installed. The power supply of the frequency-voltage conversion device is the output voltage of the secondary coil and has a voltage stabilizing device that stabilizes this voltage. Therefore, the power supply with a simple structure can be inexpensive and miniaturized. The smaller the oscillation frequency of the converter's oscillation control, the larger the output of the frequency-voltage conversion device, so one lighting device can be used to install multiple

2148-4882-PF (N); ahddub.ptd Page 18 554644 V. Description of the Invention (15) The discharge lamps of a plurality of types whose rated currents are approximately equal and whose rated output powers are different. The control device suppresses the current of the discharge lamp when the discharge lamp with a small rated output power is installed, so the characteristics of the frequency-voltage conversion device are opposite characteristics, that is, the current of the discharge lamp is increased, which is suitable. Compared with the method of rated output power of the discharge lamp, compared with the failure mode of the frequency-voltage conversion circuit, it can be more secure. A voltage reduction device is provided to reduce the output voltage of the frequency-voltage conversion device and reduce the voltage determined in advance. Therefore, the conversion coefficient of the frequency-voltage conversion circuit can be increased, and the discrimination ability of different types of discharge lamps can be enhanced.

2148-4882-PF (N); ahddub.ptd Page 19 554644 Brief description of the drawings Fig. 1 is a circuit diagram showing a discharge lamp lighting device according to Embodiment 1 of the present invention. Figures 2 (a) to (d) are explanatory diagrams showing operation waveforms of the discharge lamp lighting device according to the first embodiment of the present invention. Figures 3 (a) to (b) are comparisons of the operation of the discharge lamp lighting device of the first embodiment and the operation characteristics of a conventional example. Fig. 4 is a circuit diagram showing a discharge lamp lighting device according to a second embodiment of the present invention.

5 (a) to (c) are explanatory diagrams showing operation waveforms of the discharge lamp lighting device of the second embodiment of the present invention. Fig. 6 is a circuit diagram showing a discharge lamp lighting device according to a third embodiment of the present invention. Figures 7 (a) to (e) are explanatory diagrams showing operation waveforms of the discharge lamp lighting device according to the third embodiment of the present invention. Fig. 8 is a circuit diagram showing a conventional discharge lamp lighting device. Fig. 9 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 ~ current-resistant coil; 6,10 ~ discharge lamp; 7,11,8,12 2 ~ condenser; 13 , 14, 15, 16 ~ resistance;

2148-4882-PF (N); ahddub.ptd Page 20 554644 Schematic description of the body (diode); 53 ~ resistance 50 '5b 2: 52 ~ capacitor; 55 ~ capacitor; 5 9 ~ transistor; 61 ~ Capacitance; 6 3 ~ diode; 6 7, 6 8 ~ resistor 5 4 ~ zener diode; 56, 57, 58 ~ resistor 60 ~ resistor; 62 ~ op amp; 65 ~ capacitor; 69 ~ variable 3 Terminal regulator (regulator); 70 ~ resistor; 71 ~ diode; 80, 81 ~ zener diode; 100 ~ fV conversion circuit; 101 ~ control circuit; L100, L110 ~ discharge lamp load circuit .

2148-4882-PF (N); ahddub.ptd

Claims (1)

554644 6. Scope of patent application1. A discharge lamp lighting device, including a DC power supply; a converter circuit, and an old-fashioned electric current; u L and i current; The number of direct power = = 路, # by the high frequency from this converter circuit is characterized by: The load circuit of the capacitor includes: a current-resistant coil, a discharge lamp, a coupling and =, and a capacitor connected in parallel to the discharge lamp; the circuit Two people are on the line ten times. ^ Their respective pairs are set on the above discharge lamp loads and connected to the upper two. Γ Γ 圏 is driven through the respective current-limiting elements and connected by a pair of voltage switching pairs in parallel. The switching of the above-mentioned switching element to the ΪΓΛ voltage conversion device, from the electrical waste of the secondary coil output, to the DC voltage corresponding to its oscillation frequency, and the quasi-mf. The output is the change of the oscillation frequency of the electric it element to control the discharge lamp 2 as described above. Please refer to the discharge lamp point described in the item above. The power supply of the pressure-tolerance conversion device is the output voltage of the secondary coil. Equipped with a voltage stabilization device that stabilizes this voltage. 3. The discharge lamp lighting device as described in the patent claim No. 丨 or 2, the circle 2148-4882-PF (N); ahddub.ptd Page 22 ί = The smaller the vibration frequency of the control is, the frequency-electricity policy is the discharge lamp lighting device described in item 1 or 2 of the patent scope of Matsushita ’s patent. The 2 king device is installed in a discharge lamp with a small rated output power. At this time, to suppress the current of its discharge lamp. 5. The discharge lamp lighting device according to item 1 or 2 of the scope of patent application, wherein a voltage reduction device for reducing the voltage output by the frequency-voltage conversion device and reducing a predetermined value is provided. 2148-4882-PF (N); ahddub.ptd Page 23