TW200415959A - Discharge lamp light-up device (3) - Google Patents

Abstract

The object of the present invention is to provide a discharge lamp light-up device, which can correctly recognize the normal discharge and abnormal discharge of a discharge lamp without being influenced by the DC voltage fluctuation. To achieve the object, the discharge lamp light-up device includes discharge lamp loading circuit L100, L110, that utilize high-frequency current of a frequency converter circuit, which converts direct current supplied by a DC power source 1 into the high-frequency current, to light up the discharge lamps 6, 10; a protection circuit including peak-to-peak voltage detecting circuits P100, P110 for detecting the peak-to-peak voltage between the two terminal voltages of the coupling capacitors 8, 12 of the discharge loading circuit; a determination circuit C100 for comparing the peak-to-peak voltage detected by the peak-to-peak voltage detecting circuits P100, P110 with the voltage obtained by voltage-dividing the voltage of the DC power source 1, so as to output a stop signal to make the frequency converter stop oscillating when the peak-to-peak voltage is smaller; and a holding circuit H100 to make the converter circuit stop oscillating based on the stop signal of the determination circuit C100.

Description

200415959 V. Description of the invention '-[Technical field to which the invention belongs] Frei: It is a discharge lamp with a protection circuit having a lighting device using a Guli discharge lamp from a self-excited inverter circuit Point = [prior art] In the high-frequency inverter circuit 24, the oscillation discharge lamp lighting device is used to set the life check 'lighting', the tube voltage; the life judgment circuit 55, the two lights During the daytime monitoring, the tube voltage 22 or more that is above the positioning accuracy is detected at the end of the current output end of life judgment signal: ί: Yi Γ29, and the reverse-phase alarm should come from the elder brother's end-of-life judgment circuit Xi Yagi re-signal, so that The inverter circuit stops vibrating; the life judging period is judged to be equal to the end of the life of the two-frequency judging circuit by using the latch circuit after stopping the oscillation (for example, Patent Document 丄). "" Revolving [Patent Document 1] JP 9-289095 (paragraphs 0017 ~ 0039, Figure 6) [Summary of the Invention] The problem to be solved by the invention is shown in Figure 3 in Patent Document 1. Depicted in Figure 1. 5〇 ^^ t; 6 (AtS " 39 is referred to as a light lamp (discharge lamp)) after the voltage is divided across the two ends, the detection of the document Hungzhou capacitor 50 200415959 V. Description of the invention ( 2) The voltage at both ends is recorded as the state of the capacitor lamp, and the discharge lamp is again at the end of the input power supply and the end of the life at the input power. The voltage across the input power at 40W is about 95V, and the voltage at the end of the life is also different. Therefore, there are also The purpose of the present invention is to identify the voltage variation of the discharge lamp = the voltage between spikes. (In Patent Document 1, in the paragraph 0032 fold voltage rectification circuit), the discharge lamp is normally turned on and the electric current of the electric lamp is also increased or decreased due to the change in the power supply voltage, and the two voltages are also increased or decreased. The voltage across the discharge lamp at the end of its life is also affected by voltage fluctuations. In addition, the change in voltage due to the identification level of the identification comparator of the life judging circuit 55 for determining the normality of the discharge lamp is fixed, and there is a problem that the voltage change in the protection operation at the end of life becomes uncertain. In addition, when the discharge lamp is normally lit, for example, in a fast-start type fluorescent lamp, the discharge lamp is about 125V at 32WHf, which varies depending on the discharge lamp. Also, the detection power obtained by the voltage detection circuit during the peak value during discharge must be in accordance with the discharge lamp. The type of the identification level is changed, and the number of types of parts of the garment lighting device is increased. In order to solve the above-mentioned problems of previous devices, 'the first is to provide a discharge lamp lighting device, which can operate without error and has a normal discharge and abnormal discharge, and will not be affected by DC power. < 'The second object of the present invention is to provide a discharge lamp lighting belt', which has a protection circuit for abnormal discharge of a discharge lamp composed of 20,000 pieces with the same circuit structure regardless of the type of the discharge lamp. 7 'The third object of the present invention is to provide a discharge lamp lighting device f, which has a protection circuit. Unplugging several of the plurality of discharge lamps = clothes can also detect the normal lighting and abnormality of the remaining discharge lamps. Lighting • No +

2148-5645-PF (Nl) .ptd Page 7 V. Description of the invention (3) In the case of the peak-to-peak voltage detection circuit, the difference between the detected voltages ^ the difference between the voltages and all the discharge lamps installed in accordance with and installed all It is also abnormal when the discharge lamp is pulled out, and some of the discharge lamps are unplugged. In the same condition, the discharge lamp is detected. The fourth objective of the present invention is to deal with the problem. The operation test circuit of the lamp load-mounted lamp load circuit can practically ignore the means for solving the problem of discharge. The discharge lamp-mounted circuit of the present invention is provided with a power source, a power source, and a frequency converter. The two cutting drags-from the DC conversion of the μ straight 'claw power supply to the two switching half-bridge circuits of the ancient frequency thunder cold :: the anti-coil of the high-frequency motor, via the anti-coil and the discharge lamp Link, Λ has a body, using the two poles connected to the positive and negative poles of the variable power supply and the protection circuit, the discharge lamp is lit according to the high-frequency current on the day; the protection circuit includes the spikes = cheeks as the stop , Its special electric light load circuit gφ ^ B electric 1 detection Circuit, to detect the peak voltage of the two ends of the discharge valley (Pea t0 Peak), to determine the peak-to-peak voltage detected by the voltage circuit between the circuit values; The obtained voltage, at the peak lightning ;: the inverter circuit stops oscillating after the voltage division of the voltage to the power supply t: to a relatively small case, the output makes the determination circuit stop; ;; the circuit, according to the stop state Continue. Only when the army road stopped oscillating, and made 200415959

[Embodiment] Embodiment 1 FIG. 1 is a circuit diagram showing a discharge lamp lighting device according to an embodiment of the present invention, FIG. 2 is a circuit diagram of a DC power source obtained from a commercial power source, and FIGS. 3 and 4 illustrate the discharge lamp lighting The movement of the device is straight: sex diagram. In Fig. 1, the DC power source 1 obtained from the commercial power source 1 is composed of M0SFET2 and 3, which is composed of M0SFET2 and 3, which is composed of the following openings. Discharge lamp load circuit L100: the following components are constituted by a current-resistant coil 5; a coupling capacitor 8 is connected via a 'yang impedance second wire Λ5; a capacitor 7 is connected in parallel with the discharge lamp 6; a two-pole °° connection point is connected, and In the diode 22, the cathode is connected to the positive electrode of the direct power source 1, and the anode is connected to the cathode of the diode 21. Straight muscles same discharge] lamp load circuit L1. . The two components below constitute the pole body 23, the anode is connected in parallel with the DC and discharge lamp 10; the anode of the two DC power supply 1 is connected to /, and the pole body 24, the cathode is connected to the anode P and the cathode of the diode 23 connection. 5, / / The current-carrying coil 5 of the second load circuit L100 is provided with two secondary windings 5a, 5b, and the windings 9a, 9b are in the negative lane of the discharge lamp, and the current-proof coil 9 of the secondary circuit LU0. Set two gates and sources of the secondary element 2: Gate VII is connected to the switching element via resistors 14, 16 and connected to the switching element 3: ":: under winding; b, between the source via resistors 13, 15 (With one point chain line and chain line icon 200415959

The connection of the primary winding and secondary winding of the current-resistant coils 5 and 9)-5a, 9a according to the illustration • The two-action secondary winding 2 of the polarity interactive switch, and the secondary windings 5b, 9b according to the illustration • Polar six-pole changer moves the switching element 3.夂 Mutual switch driving In addition, the illustration of equivalent diodes built into the gate and source of switching elements 2 and 3 is omitted. In addition, illustration of a starter circuit for a parallel circuit is also omitted. & Dynamic frequency converter electric detection surface-to-surface capacitor 8 of the secondary winding 5b at both ends of the peak-to-peak voltage (peak-to-peak voltage detection ^ spikes are PP detection circuit) P1 〇〇 by the following components Composition, series (= hereinafter referred to as 31, 32, parallel to the coupling capacitor 8; diode 33, anode connection of anode P capacitor source 1, cathode connected to capacitor 31, capacitor 32 ^ and DC; diode 34, anode and The cathode connection of the diode 33 is connected to the cathode of the diode 34 and the negative electrode of the DC power source j. '4 is 35, and the capacitor 35 is connected in parallel; and the diode 37, the cathode and resistance = 6' J and the inverting input terminal of comparator 55 of comparator 55 described later | Che Yang. This PP detection circuit? 丨 0 0 detects the voltage across the coupling capacitor 8 according to the inverse ratio of capacitor 3 1 and capacitor 3 2 ^ The peak voltage ^^ capacitor 35 obtains its output voltage. The electric detection circuit P110 is composed of the following components, the capacitors in series, 42, and the coupling capacitor 12 are connected in parallel; the diode 43, the anode and the straight source 1. of _ negative connection, cathode and capacitor 41, capacitor The connection point of 乜 is connected with 4 poles, a pole 44, the anode and the cathode of the diode 43 are connected; the capacitor 45 is connected between the cathode of the diode 44 and the negative pole of the DC power supply; the resistance cut, '200415959 V. Invention Explanation (6) L electric ΪΓ5 is connected in parallel; and the diode 47, the cathode is connected to the resistor 46, and the anode :: and the inverting input of the comparator 55 of the decision circuit described later = the inverse of the connection t = 1 'the circuit P1 1 〇 According to the capacitance value of capacitor 41 and capacitor 42, the voltage between the two ends of the electric capacitor 12 is peaked, and the output voltage is obtained at DJ 45. D i, the resistance 51, 52 and the DC power supply 1 Connect the connection points of resistors 53 and 54. Point connection, inverting input terminal and

The old J 尘 circuit C 1 00 compares the voltage between the peak voltage detected by pp and the peak voltage p D and the voltage obtained by dividing the voltage between the peak-to-peak electrical power source 1 detected by Kyrgyzstan, Road 100, and P1 10. In the signal. 1 When the voltage is small, the output circuit will stop the vibration and stop the judging poles] d: Composed of = down: 70 pieces' silicon controlled rectifier 6 1, gate negative connection; diode two rain two terminal connection, cathode and DC current 1 current transformer 61: t head Λ; and resistor 63, connected to Shi Xigang's data judgment circuit C1 00 only; j! '1 \ positive poles keep the circuit 00 depending on the stop state Continue. Order No. 5 ... The circuit is stopped. "In addition, the pp detection circuit, + + holding circuit m 00 constitute a protection circuit. Judging the circuit c100 and the DC power source in the case where the DC power is obtained from the commercial power source 丨 2l48- 5645-PF (Nl) .ptd j ^ · Page 11 200415959 V. Description of the invention (7) The circuit structure is shown in Figure 2. The AC power output from the commercial power source 13 is structured via a diode bridge. B After full-wave rectification, the smoothing capacitor is used as the DC power to output to the load circuit. Next, the operation of the discharge lamp lighting device according to the embodiment i of the present invention will be described with reference to Figs. 1, 3 and 4. Fig. 3 (a) shows the voltage waveform of the coupling capacitor C8 when the discharge lamp 6 is normally discharged. Fig. 3 (b) shows the voltage waveform of the coupling capacitor Cl2 when the discharge lamp 10 is normally discharged. Figure 4 (a) shows the voltage waveform of the coupling capacitor when the discharge material of the filament connected to the anti-current coil 5 of the discharge lamp 6 is consumed. Figure 4 (b) shows the voltage waveform of the coupling capacitor ⑶ when the discharge lamp is normally discharged. 4 (c) represents the consumption date of the discharge material of the filament connected to the coupling capacitor 8 of the Mei electric lamp 6 ^ voltage waveform of the Xingmahe capacitor C8. As shown in FIG. 1 ′, when the DC power supply 1 is supplied, the MOSFETs 2 and 3 are driven alternately at a frequency by using a start circuit (not shown), so that the discharge lamps 6 and 10 are turned on. The proper selection of the constants of the discharge lamp load circuits L1 0 0, L1 10, the voltages of 8, 12 in an electric valley are set to discharge lamps 6, 10, and ^, 3 (a) ,, ( b) The waveform shown. In other words, the combined current of the currents of the discharge lamps 6, 10 and the current flowing in the red capacitor = two capacitors 7, 1 1 flows to 1 / W °° 8, 1 2 and becomes the voltage of the positive electrode of the DC power supply 1. The voltage of V1 is t %%, the waveform is symmetrical, but the voltage generated by using these combined currents in the coupling capacitors 8 and 12 is set to be higher than the voltage of the second direct current and the voltage of the negative 9 The parts with low voltage V ° are used respectively: the poles f21, 22, 23, 24 return to the DC power source i. The following equations (1), (2), and (3) will determine the circuit

2148-5645-PF (Nl) .ptd Page 12 200415959 V. Description of the invention (8) The voltage of the inverting input terminal of the comparator 55 obtained by dividing the voltage of C1 00 by the resistance 53 and 54 is selected as a ratio of 5 The voltage of the non-inverting input terminal of comparator 5 5 obtained by the divided voltage of 1, 5 2 is large. V55 (positive phase) = V1 X R52 / (R52 + R51) (l) V55 (reverse phase) = V1 χ R54 / (R53 + R54) (2) V55 (normal phase) < V55 (reverse phase) (3) but The symbols of the above formula are shown below. V1: Positive voltage V55 (positive phase) of DC power supply 1: Non-inverting input terminal voltage V55 (inverting) of comparator 55: Inverting input terminal voltage of comparator 55. However, diodes 3 7, 4 7 are inverse When biasing, R51, R52: resistance values of resistors 51, 52, R53, R54: resistance values of resistors 53, 54, if the voltage v 丨 of the DC power supply 1 fluctuates as shown above, the comparison state 55 of the circuit C100 is judged The relationship between the voltage of the inverting input terminal and the non-inverting wheel input terminal is always the same. The output of the comparator is at a low level, and the silicon controlled rectifier 6 1 of the holding circuit Η 100 is turned off. Also, during normal discharge, the voltages obtained by the capacitors 35 and 45 of the PP detection circuits P 1 Q Q and ρ 1 1 0 are set to satisfy the following formulas (4), (5), (6), and (7). In addition, the forward voltage drops of the diodes 33, 34, 37, 43, 44 and 47 are regarded as 0 in the following formulas and ignored. V35 = V1 X C31 / (C31 + C32) ⑷ V45-V1X C41 / (C41 + C42) (5) V55 (inverted) < V35 彳

Page 13 200415959 V. Description of the invention (9) V55 (inverted) < V45 (7) Here, the symbols of the above formula are shown below. V35: The voltage of the capacitor 35 when the discharge lamp 6 is normally discharged, that is, the voltage obtained by dividing the voltage V1 of the DC power source 1 by the capacitors 31 and 32 using FIG. 3 (a). V45: The voltage of the capacitor 45 when the discharge lamp 6 is normally discharged, that is, the voltage obtained by dividing the voltage V1 of the DC power source i by the capacitors 41 and 42 from FIG. 3 (b). When states (1) to (7) are satisfied, regardless of the change in the voltage v 1 of the DC power source 1, diodes 37 and 47 are reverse biased to a state where the cathode voltage is always higher than the pole voltage, PP The output voltage of the detection circuit ρι〇〇, pn〇, the voltage of the inverting input terminal of the comparison state 55 of the circuit C100 has no effect. Here, for example, the discharge lamp 6 changes due to the consumption of the discharge substance of the filament a, etc. f:: t Ϊ ′ 0 becomes the half-cycle discharge of the filament discharge at the end of its life

Pioo detection side = voltage waveform. Use pp to detect the lightning to the circuit " + ★ The voltage between the peaks of the A 8 hole, obtained from the capacitor 35) ψ ^ ^ The voltage obtained when the lamp is turned on is small, and the diode 37 becomes a forward bias, so that the judgment Lei 敉 Γ decreases from the voltage again, because the output of the inverting input terminal of the positive comparison f5 becomes a high level, 佯: the voltage becomes larger, and the comparator 55 is turned on. The silicon-controlled rectifier 61 of the holding circuit H1 〇 becomes conductive. If the silicon-controlled rectifier 61 becomes conductive, the windings 5b and 9b each pass the resistance 13 because the secondary current of the reactive coils 5 and 9 flows to the gate of the switching element 3.

200415959 V. Description of the invention (ίο) The current flow · by-pole body β 9 ^ 播 播 a Bypassing the switching element 3 from Hong Z, Shi Xi controlled rectifier 61, the circuit stops vibrating. μ m ^, ′ The holding current is continuously flowing to the silicon controlled rectifier through the resistor 6 3 to + light, & the DC power supply 1 is turned off and then kept on until the state is maintained, which can prevent the lamp 6 from operating in a state of continuous abnormal discharge. = Outside ^ The above description has explained the filament difference #of the filament on the connection side of the anti-current coil 5 of the discharge lamp 6, but as shown in FIG. 4 (c), the filament on the connection side of the coupling capacitor 8 is abnormal. According to the same effect as the above, the inverter circuit can be stopped when the discharge lamp 6 is abnormally discharged. It is also obvious that even when the discharge lamp 10 is not normally discharged and the discharge lamps 6, 10 are not normally discharged, it is also possible to prevent the operation in a state of continuous abnormal discharge. It is also known from the above formulas (1), (2), (4), and (7) that when the discharge lamps 6 and 10 are normal, the input voltage of the comparator 55 and the DC power supply of the determination circuit cl00 The voltage V1 of 1 is proportional to the voltage V1. The input voltage of the comparator 5 5 also varies according to #day,?, The same variation ratio, and is not affected by the voltage change of the DC power supply 1. 4 (a), (c) and the above-mentioned formulas (4) and (5), it is known that the pp detection circuit P 1 0 0, P 1 1 〇 in the case where one of the discharge lamps 6 and 10 is abnormal. The detection voltage has nothing to do with the change of the voltage V1 of the DC power supply 1, because it must be lower than the detection voltage when the discharge lamps 6 and 10 are normal. The voltage of the non-inverting input terminal of the comparison circuit C100 is 55 compared with the inverting input terminal. If the voltage is high, setting the output voltage to a high level can make the inverter circuit continue to stop oscillation for protection. Moreover, regardless of the type of discharge lamp, the discharge substance in the filament of the discharge lamp

2148-5645-PF (Nl) .ptd Page 15 The abnormality of the situation The same electricity and holding abnormality constitute the secondary parts 2 and 3 L100 Photo and normal. As shown, do n’t put the voltage change. 5. Description of the invention (11) The small consumption of the quality is small. It can be used at the end of the life of the phase circuit C100. Because the circles 5 and 9 each drive and switch the elementary lamp load electric lamp, it is also possible. According to the difference between the discharge lamps above and the stable discharge current of the current-sense power supply than the detection circuit structure during discharge, the PP circuit H100 discharges the protection of the negative windings 5a, 5b of each discharge lamp, and the PP detection, L1 10 independent lamps. In the case where all the filaments are normal, the discharge current and voltage must be higher than those of the detection circuits P100, P110 and the determination circuit structure during normal discharge. Load circuit L100, L110, anti-current lines, 9a, 9b output voltage in parallel circuit P100, P110 and their respective amplifier settings, unplug one of the discharge installation conditions the same condition detection if according to the embodiment 1 of the present invention The normal discharge and abnormal discharge of the lamp can be operated without error and will not be affected. Xia Yi, regardless of the type of discharge voltage, can use the same circuit structure, Π parts to form a protection circuit for abnormal discharge of the discharge lamp. In addition, by removing several of the plurality of discharge lamps, it is also possible to check the peaks between the normal and abnormal lighting conditions of the remaining discharge lamps ^ The difference between the output voltage of the detection circuit and all discharges installed The condition of the lamp = The difference between the measured voltages is unchanged. If you remove a few of the discharge lamps, you can also detect the abnormality of the discharge lamp under the same conditions as the full case. 4 In addition, in the present embodiment, the case where the discharge lamp load circuit is two electric circuits has been described, but it may be one circuit or three or more circuits. Example 2

2148-5645-PF (Nl) .ptd

200415959

Fig. 5 is a circuit diagram showing a second embodiment of the present invention. In FIG. 5, the components that have the same function as the structure of the real lighting device are given the same sign, and the circuits have the same _〇, and the series resistances 71, 72;:; 4 =;? ,,. In _Circuit 1, and coupled to the lightning σ electric valley state 8 Asian Union. In the first embodiment, the connection point of the coupling electric order is 8, and the connection point of the discharge lamp 6 is connected to the connection point of the second embodiment and the resistors 71 and 72. "" '12 and =: = 110, and the series resistors 73 and 74 … The snow point of the capacitor point connection is H, the coupling sigma valley is 12, the discharge lamp 10 is connected to the 4th state 1, and the connection point of the resistor 2 and the resistor 7 3, 7 4 is connected in this embodiment 2. Structure and implementation other than this The diagram of Example i is the same as that of 3. The connection point of 74 is set to ϊ: The discharge lamp lighting device according to Embodiment 2 of the present invention will be described with reference to FIG. 5. The operation of C100 'holding circuit 100 is the same as that of the embodiment. 5 The judging circuit c 1 0 0 'is set to satisfy the formula ⑴, — (3) shown in the embodiment i. During normal lighting, the voltage V 1 of the DC power supply 1 changes. The voltage relationship between the inverting input terminal and the non-inverting input terminal of the device 5 5 is always the same. The output of the comparator is at a low level, so that the silicon-controlled rectifier 61 of the holding circuit Η 1 0 0 becomes non-conductive. 5. When DC power is applied, the start circuit (not shown) is used to drive M0SFETs 2 and 3 at high frequency, so that the discharge lamps 6 and 10 are turned on. When the discharge lamps 6, 10 are normally discharged, the detection voltage of the PP detection circuit pi〇〇, pil () is as shown in the following formulas (8), (9). V35-Vlx (C31 / (C31 + C32) ) X (R72 / (R71 + R72)) (8) V45 = Vlx (C41 / (C41 + C42)) X (R74 / (R73 + R74)) (9)

200415959 V. Description of the invention (13) However, the symbols of the above formula are as follows. V3 5: The voltage of the capacitor 35 when the discharge lamp 6 is normally discharged. V4 5: The voltage of the capacitor 45 when the discharge lamp 6 is normally discharged. R71, R72, R73, R74: resistance values of the resistors 71, 72, 73, 74 °, and the relationship between V3 5, V45 and the determination circuit cl is set in advance to satisfy the formulas (6) and (7) of the first embodiment. The above formulas (8), (9) and embodiments! Compared with the equations (4) and (5), the detection voltages of the PP detection circuits Pl00 and pn0 shown in the equations (8) and (9) are compared to the detection voltages shown in the equations (4) and (5). Multiplying by a factor smaller than 1, it is learned that the discharge lamps 6 and 10 are normally lit, and that the abnormal discharge of the discharge lamps 6, 10 and 1 also has the same effect as that of the embodiment. / 、 In addition, in Example 1, the series circuit of the PP detection thunder and the ... container 8 ;: electricity; ===, when the capacitance value, the discharge lamp load circuit u〇〇- Electricity Example 2, because capacitors 31, 32 via Electricity and 71 4 * Zhang Renxiong has been reducing the capacitance of capacitors 31 and 32. The connection of capacitor 8 can be loud, which can make the selection range of capacitors 31 and 32 = shadow of capacitor 8. In addition, in the operation of the inverter circuit, the effect of capacitor 31 32 on light-on capacitor 8 can be ignored. PP detection circuit PU0 > 1 η η ^ ^, ^ 73 N 74 is chosen to be much larger than the impedance of the coupling capacitor 8, \ right the resistance 71 resistance value measurement circuit P100 resistance 71, 72 phase ^: Gu Yi, 74 In addition, in the above-mentioned formula (8), ~] does not divide the voltage of the resistor 72

2148-5645-PF (Nl) .ptd Page 18 200415959 V. Description of the invention (14) For the peak-to-peak voltage detection, just delete the capacitor 3 2 in the above formula (9), in order not to change the resistance To detect the voltage between 74 ° and the peak voltage of the sample, simply delete the capacitor 42. The operation of the knife 1 According to the above-mentioned PP detection circuits P100 and P110, the detection lamps 6, 10 are normally lit and the discharge lamps 6, 10 are one of them-the case of the enemy lamp has the same effect as in the first embodiment. Eight abnormal points, that is, when the discharge lamps 6 and 10 are normally turned on, if (1) to (3), (6) to (9) are satisfied, the voltage of the DC power source ^ is changed to the comparator C100 of the second formula 55 The relationship between the circuit size of the reverse-phase input terminal and the normal-phase input terminal is always the same. The comparator output is a low-voltage H100 silicon-controlled rectifier 61 that becomes non-conducting. One of the lights 6, 10 ~) Lu Jiji Zhenying. The detection voltage of circuit P1 〇〇 or Pi 1 〇 is lower than the voltage of comparator 55 of the comparator 55 in the k ′ pp detection circuit παο under normal conditions, and the output of the comparator 55 becomes a high level, keeping the voltage lower. , 61 becomes conductive 'the inverter circuit stops the vibrating surplus circuit Hl °° and the stone evening rectifier gets 4m'. In addition to the effect shown in Example 1, it is also possible to use only the PP detection circuit pi〇〇, p The effect of the operation of the discharge lamp load circuit is as shown above. If the effect of the invention according to the present invention includes: a DC power supply; the inverter power = the DC conversion of the lamp lighting device to lettuce f $ 〇tian, there is a half-bridge circuit structure 2148-5645-PF (Nl) .ptd which will use the DC power source as the two switching elements of the high-frequency current 2148-5645-PF (Nl) .ptd page 19 200415959 invention description (15); discharge lamp load circuit, has The coupling capacitor connected to the discharge lamp lights the discharge lamp with a bipolar body frequency current connected to the positive and negative poles of the source; and the inverter is stopped by the voltage; the voltage between the spikes of the discharge lamp load is detected due to the protection circuit; the judging circuit Detected The spike-to-peak voltage and the obtained voltage are stopped at the spike-to-peak frequency circuit, and the stop signal of the stop-determining circuit causes the stop-state to continue; it can operate without error and abnormal discharge, and will not be subject to DC In addition, there are no parts of the type of the discharge lamp to constitute a protection circuit. The anti-coil, via the anti-coil, and from the coupling capacitor and the direct current 'use a high protection circuit from the inverter circuit, in accordance with the electrical compliance of the discharge lamp. The circuit includes a voltage comparison between the two ends of the consumable capacitor of the peak-to-peak voltage detection circuit. The peak-to-peak voltage detection circuit divides the voltage of the DC power supply and the output voltage is relatively small. According to the frequency discriminator circuit, the oscillation is stopped, and the voltage variation of the normal discharge power supply of the identification discharge lamp which is stopped and stabilized is affected. Off, the same circuit structure and the same

’Can also make the detection of the condition of < the voltage between the peaks and peaks A can follow and all 〇

Also 'remove some of the remaining discharge lamps from the normal lighting and abnormal lighting status detection circuit of the wheel and the difference between the voltage of the wheels and the voltage of all installed = the voltage t difference remains the same Several of the discharge lamps have the same condition as the previous month to detect the abnormality of the discharge lamp.

Page 20 200415959 Brief Description of Drawings Figure 1 is a circuit diagram showing the structure of a discharge lamp lighting device according to the first embodiment of the present invention. Fig. 2 is a circuit diagram of a DC power source in a case where a DC power source is obtained from a commercial power source of a discharge lamp lighting device according to Embodiment 1 of the present invention. Figs. 3 (a) to (b) are waveform diagrams illustrating the operation of the discharge lamp lighting device according to the first embodiment of the present invention. Figures 4 (a) to (c) are waveform diagrams illustrating the operation of the discharge lamp lighting device according to the first embodiment of the present invention. Fig. 5 is a circuit diagram showing a structure of a discharge lamp lighting device according to a second embodiment of the present invention. Explanation of symbols 1 power supply, 5, 9 current-resistant coils, 8, 1 2 coupling capacitors, 31, 32, 35 capacitors, 36, 46 resistors, 43, 44, 47 diodes, 5 5 comparators, 6 2 diodes , 71, 72, 7 3, 74 resistors, 2, 3 switching elements, 6, 10 discharge lamps, 21, 22, 23, 24 diodes, 33, 34, 37 diodes, 41, 42, 45 capacitors , 51, 52, 53, 54 resistance, 6 1 silicon controlled rectifier, 63 resistance, L100, 110 discharge lamp load circuit, P100, 110 PP detection circuit, C1 0 0 judgment circuit, Η1 0 0 holding circuit.

2148-5645-PF (Nl) .ptd Page 21

Claims (1)

200415959 1 · A discharge lamp lighting device comprising: a DC power supply; an inverter circuit comprising a DC conversion discharge lamp load circuit comprising a half-bridge circuit comprising 2 switching elements of the DC current as a high-frequency current; The coupling capacitor connected via the discharge lamp and the diode connected to the positive and negative poles of the coupling capacitor = ^ = the coil and the source use the frequency σ: f current to make the discharge lamp light; and the high frequency of the circuit The inverter stops the protection circuit according to the voltage of the discharge lamp, and the protection circuit includes: a peak-to-peak voltage detection circuit that detects the peak-to-peak voltage of the voltage across the negative capacitor of the discharge lamp; If the peak-to-peak voltage detected by the peak-to-peak voltage detection circuit and the voltage between the peak-to-peak voltage obtained by dividing the voltage of the DC power source are relatively small, a stop signal for stopping the oscillation of the inverter circuit is output; The circuit stops the inverter circuit from oscillating according to the stop signal of the determination circuit, and causes the stop state to continue. 2. A kind of discharge lamp lighting device, including a direct current power supply; an inverter circuit 'is composed of a half bridge circuit with two switching elements that convert the direct current supplied by the direct current power supply to a frequency current; a discharge lamp load A circuit having a current-resistant coil, via the current-resistant coil, and 200415959 VI. Patent application: Coupling capacitors connected to discharge lamps and diodes connected from the coupling capacitors to the positive and negative poles of the DC power supply, using high-frequency current from the inverter circuit to light the discharge lamps; and protection circuits, The inverter is stopped according to the voltage of the discharge lamp; It is characterized in that the protection circuit includes: a peak-to-peak voltage detection circuit, which detects the resistance after dividing the voltage across the coupling capacitor of the discharge lamp load circuit with a resistor The voltage between the peaks of the divided voltage; the judging circuit compares the voltage between the peaks detected by the voltage between the peaks and the voltage obtained by dividing the voltage of the DC power supply, and the voltage between the peaks A relatively small case outputs a stop signal that stops the inverter circuit from oscillating; and a hold circuit, which stops the inverter circuit from oscillating according to the stop signal of the determination circuit, and causes the stop state to continue. 2148-5645-PF (Nl) .ptd Page 23