TW569649B - Discharge lamp lighting device - Google Patents

Abstract

The invention provides a discharge lamp lighting device which can continue to turn on the power even after the oscillation of the switching device is stopped due to the lifetime of the discharge lamp. Also, the discharge lamp can be automatically turned on when the un-lighted discharge lamp is replaced by a normal discharge lamp installed. The discharge lamp lighting device of the present invention comprises: an inverter circuit of a pair of switching devices 2, 3 to convert the DC current from the DC power source 1 into high-frequency current; a discharge lamp loading circuit L100, L110 formed of a circuit serially-connected by a choke coil 5, 9, discharge lamp 6, 10 and capacitor 12; a protection circuit H100 to detect the abnormal discharge state of the discharge lamp 6, 10 to stop the oscillation of the inverter circuit; and a reset circuit R100, R110 to relieve the holding-stop of the protection circuit H100.

Description

569649 V. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to a reset circuit having a protection circuit for a lighting device for turning on a discharge lamp by a self-excited converter circuit. . [Conventional Technology] Fig. 5 is a circuit diagram showing a conventional discharge lamp device. In the figure, 1 is a DC power source obtained from a commercial power supply, 2 and 3 are switching elements made of MOSFETs constituting a converter circuit, 23 ° is a resistor connected in parallel with the switching element 2, L100 is a discharge lamp load circuit, and It is composed of a choke coil 5, a discharge lamp 6, a capacitor 7 connected in parallel to the discharge lamp 6, and a coupling capacitor 8. L110 has the same structure as the discharge lamp load circuit L1, and is connected in parallel to the discharge lamp load circuit. The discharge lamp load circuit of 100 is composed of a current-resistant coil 9, a discharge lamp 10, a capacitor u, and a coupling capacitor 12 To constitute. 4 is a current transformer (hereinafter referred to as CT) connected to the connection point of a pair of switching elements 2 and 3 and the connection point of the parallel circuit of the discharge lamp load circuit L1 0 0, L1 10, and its secondary coil 4a The 4 and 4b drive the switching elements 2 and 3 alternately with ON / OFF polarity as shown in the figure, and are connected between the gates and sources of the switching elements 2 and 3 through the respective resistors 13 and 14. (To show the combination of the primary coil and secondary coil of CT4, the dotted line is shown in the figure). However, in the figure, the drain and source of the switching element 23 which are built in parallel are omitted. 6 4 is a diode connected to the positive end of the DC power source and passing through the capacitor 66, and the negative pole connected to the DC power source 1 is connected to the diode of the connection point of the resistor 64 and the capacitor 66, and the cathode is connected to the switch Element 2 and 3.

Page 4 569649 V. Description of the invention (2) 68 is a planar silicon bidirectional trigger diode (hereinafter referred to as a trigger diode, for example, equivalent to NEC) which is connected at one end to the connection point of the resistor 64 and the capacitor 66. N413, etc.), and is connected to the gate of the switching element 3 through the resistance 69. P1 00 is the pp measurement circuit for the discharge lamp load circuit L1 〇〇 In the PP measurement circuit P100, 50 and 51 are capacitors connected in series, one end of the capacitor 50 is connected to the negative electrode of the DC power supply 1, and the capacitor 5 The other end is connected to a connection point between the anti-current coil 5 and the discharge lamp 6. 52 is a diode whose anode is connected to the negative electrode of the DC power supply 1, and the cathode is connected to the connection point of the capacitor 50 and the capacitor 51. In this way, the peak-to-peak voltage (peak t0) applied between the connection point a100 of the anti-coil coil 5 and the discharge lamp 6 and the negative electrode bl00 of the DC power supply 1 (illustrated next to the anode of the diode 52). peak voltage), which is inversely proportional to the electrostatic capacitance of capacitor 51 and capacitor 50, and is taken out at the anode of diode 56. P110 is a PP measurement circuit for the discharge lamp load circuit L110. In this pp measurement circuit P110, 53 and 54 are capacitors connected in series, one end of the capacitor μ is connected to the negative pole of the DC power source, and the other of the capacitor 54 is One end is connected to a connection point between the anti-current coil 9 and the discharge lamp 10. 55 is a diode whose anode is connected to the negative electrode of the DC power supply 1, and the cathode is connected to the connection point of the capacitor 50 and the capacitor 51. Jiffa = Dagger, at the connection point between the current-resistant coil 9 and the discharge lamp 10, and / ;, L ", the negative electrode bll0 (illustrated next to the anode of the diode 52) ^ applied The peak-to-peak voltage (capacitance value of 53 between Deak = wide voltage) is taken from the anode of the diode "with the inverse ratio of the capacitance 54 and the current value of electricity 1". 7 is the cathode is connected to each other, the anode is connected to pp

2148-5173-PF (N) .ptd Page 5 JL · Description of the Invention (3) Diodes of the circuits Pioo and P110. ίΠ 0 0 is a holding circuit, the zener diode of the connection point is connected to the anode and power source of the bodies of diodes 56 and 57 by the cathode ^: 1 lesson is connected in series to the zener diode and connected to the switching element The resistance 60 and resistance 59 between the three gates, the anode is the anode, the anode is connected to the power source 1 through the m body λ 63, and the cathode is connected to the power source 1. The cathode of the current source 1 and the resistor 64 are connected to the straight Brake steam body (thv · 'A pole is connected to the J pole Γ connection of the connection point of resistor 60 and resistor 61: 70 :) 62, is connected to diode 56 and diode 57 Here, PP test: electricity Two = The electricity of the negative pole of electricity 1 is constituted by 58. For example, the voltage of one of the voltages within φ ^ ^ _ Pΐιο is measured by the peak value on the two ends of electricity valley 58 as a DC voltage. The structure of the DC power source 1 when the DC power source obtained by β commercial power source is shown in Fig. 6. As shown in the figure, the AC ESC output from the commercial power source 1a is a bridge diode. After 1 b full-wave rectification, smoothing is performed with a smoothing capacitor c 丨 1. The DC power is output to the load circuit. Next, the fifth The operation of the circuit of the conventional example shown in the figure. Once the DC power supply 1 is turned on, it is charged from the DC power supply 1 to the capacitor 66. Once the charging voltage of the capacitor 66 is triggered by the diode When the breakdown voltage of 68 rises, it is charged to the charge of capacitor 66 and is discharged by triggering diode ⑽, resistor 69, resistor 13, and secondary coil 4b. By this, the current is discharged, and because of resistance 13, the secondary The voltage generated on the coil 4b makes the switching element

2148-5173-PF (N) .ptd Page 6 569649 V. Description of the invention (4) 12 ## At this time, 'through the resistance 230, it is charged to the capacitor 7, U, 8, and the charge CT4' to switch the element 3 The path is discharged. = Here, the switching element 3 is turned on at the secondary coil of port 4, and the electricity of switching element 2 is turned off at the secondary coil 4a. And ::: element 3 is turned on again. On the other hand, the capacitance of 66-so triggers diode 6 to 8 off. And the thunder, and clothing flowing through c τ 4 = the period determined by the circuit constants of the discharge lamp load circuits L100 and 110. The direction of the current flowing is opposite. Therefore, the next time switching element 2 turns on, and the switching element 3 turns off. Thereafter, the switching elements 2, 3 alternately discharge the discharge lamps 6, 10 driven by the high frequency ^ to achieve lighting. However, when the switching element 3 is turned on, the charge of the capacitor 66 is discharged through the diode 67 and the switching element 3 ', so in the continuous oscillation, the triggering of the diode 68 is not turned on again. For example, if the discharge lamp 6 consumes filaments due to the discharge of filaments, etc. = end of life _, the voltage across the discharge lamp 6 rises earlier than when it is normally lit, and the change in its voltage is to measure the circuit with PP. The anode voltage measured by ρι〇〇 f! 56 increased, and the voltage of capacitor 58 also increased. And properly set the zener diode 61, the resistance 60, and the resistance 59 so that the voltage of the capacitor 58 obtained when the discharge lamp is turned on does not turn on, and at the end of the life of the discharge, When the voltage rises, it is turned on by the voltage obtained on the capacitor 58. If the fruit gate fluid 62 is turned on, the current flowing from the secondary coil of CT4 through the resistor i 3 to the gate of the switching element 3 is bypassed by the diode 63 and the gate 62, so Switching element 3 becomes off while switching

569649 V. Description of the invention (5) = The oscillation of the circuit stops. Even if the oscillation is stopped, the holding current continues to flow through the gate fluid 62 until the DC power source i is cut off. Therefore, it is possible to prevent the discharge lamp 6 from continuing its abnormal discharge. However, in the above, it has been explained that the discharge lamp 6 is not normally discharged, and the moon condition, but even in the case where the discharge lamp 10 is not normally discharged, the same is true in the case where one discharge lamp is not normally discharged. The ground can also be operated in a state where the abnormal discharge continues. [Problems to be Solved by the Invention] As described above, in the conventional discharge lamp lighting device, i φ ΐ source 1 is used as usual, and only the discharge lamp that cannot be turned on is replaced and installed as a normal Di Guangri. Problems with bright discharge lamps. That is, if the input is as usual =: the holding fluid 62 continues to flow through the resistance 64 through the resistor 64, and the structure: the components 2 and 3 continue to turn off, so in order to make the discharge lamp turn on again, the AC power source 1a of the DC power source 1 Meanwhile, the intermediate fluid 62 becomes closed, and the AC power source la must be turned on again. KE Gao ^ Gan is also connected to the AC power source 1a, and other lighting devices other than the lighting device 2222 are connected. These lighting devices or their ^^ wonderful source are simultaneously blocked. problem. To improve this problem: Although you are too right. On the fifth figure of Yuan +, Liuyou, set a switch in series on the DC power supply (no DC power supply! Set it; after the women's clothing is the normal discharge lamp, use the switch, but it requires a monk to put in for a long time to turn on the discharge The conventional example of the lamp is a large switch that screams and screams, so there is a problem that the restrictions on the structure of the lighting equipment using this lighting device are large, 1, 1, and t. The present invention will i 1 1, in order to solve the above-mentioned problems, the invention

569649 V. Description of the invention (6) The purpose is to provide a reason for becoming the end of life because of the filament of the discharge lamp. The reason is that borrower pp measured the circuit and the holding circuit of the two m switching element oscillation is stopped and maintained. “Even if the AC source or DC power source is not interrupted and continues to be put on, it will be lit normally for reasons such as life span. If the discharge lamp is replaced by a normal discharge lamp, it is also a cheap and compact discharge lamp lighting device that can automatically re-ignite the discharge lamp. [Means to Solve the Problem] The discharge lamp lighting device according to the present invention includes a DC power source, and a half-bridge circuit that switches one pair of 70 pieces to a pair of high-frequency currents converted from DC power supplied from the DC power source. The converter circuit, the anti-current coil, the discharge lamp, and the discharge lamp load circuit formed by a series circuit of a capacitor. ^ The discharge lamp lighting device includes a protection circuit that detects the abnormal discharge state of the discharge lamp and stops maintaining the oscillation of the converter circuit, and a reset circuit that releases the protection circuit from stopping and maintaining; and The reset circuit includes the filament of the discharge lamp, which is connected to the DC power source.

A charging section made of an electrode body and a capacitor, a differential section made of a capacitor and a resistance that differentiates the voltage of the charging section, and a control section that controls the current flowing through the protection circuit based on the output of the differential section as a reference. . In addition, it includes a DC power supply, a converter circuit composed of a half-bridge circuit having a pair of switching elements that converts the direct current supplied from the DC power to a high-frequency current, a current-proof coil, a discharge lamp, and a The discharge lamp lighting device of a discharge lamp load circuit formed by a series circuit of a capacitor includes detecting the abnormal state of the discharge lamp and stopping maintaining the converter circuit.

2148-5173-PF (N) .ptd Page 9 569649

The protection circuit of 3, and the stop of the protection circuit are released. The reset circuit includes a plurality of serially connected through the filament of the discharge lamp, the positive and negative poles of the Kuiyuan j DC power supply, Impedance: and the diode and capacitor charged by the voltage of this impedance element: the electric part, * captured by the capacitance and resistance of the voltage differential of this charging part, and the output of this differential part as the reference 'To control the current flowing through the up / down compliance circuit. The impedance element is a resistor. A resistor is connected in parallel to the capacitor of the charging section. The product of the electric capacity of the capacitor of the charging section and the resistance value connected in parallel to the above capacitor is approximately more than 0 times the oscillation period of the converter circuit and approximately 10 S or less. A plurality of discharge lamp load circuits are provided, and a secondary coil for outputting a voltage for driving a pair of switching elements is provided. Each pair of the coils is provided on a current-resistant coil of the discharge lamp load circuit, and the above-mentioned pair of switching elements pass through each The current limiting elements are connected in parallel. [Embodiment of Embodiment] Embodiment 1 FIG. 1 is a circuit diagram showing a structure of a discharge lamp lighting device according to Embodiment 1 of the present invention, and FIG. 2 is a waveform diagram illustrating the operation of the discharge lamp lighting device. In the figure, 1 is a DC power source obtained from a commercial power supply, 2 and 3 are switching elements made of MOSFETs constituting a converter circuit, 230 is a resistor connected in parallel with the switching element 2, and [100] is a discharge lamp load circuit , And by anti-flow

2148-5173-PF (N) .ptd Page 10 569649 V. Description of the invention (8) 2 turns 5, discharge lamp 6, capacitor 7 and coupling capacitor 8 connected in parallel to the discharge lamp 6. li 1 〇 and the discharge lamp load circuit L 100 have the same structure, and are discharge lamp load circuits connected in parallel to the discharge lamp load circuit L 100, and are composed of a current-resistant coil 9, a discharge lamp 10, a capacitor n, It is constituted by a coupling capacitor 12. 4 is a current transformer (hereinafter referred to as CT) between a pair of switching elements 2 and 3 and a connection point of a parallel circuit of the discharge lamp load circuits L 1 0 0 and L 1 10. The coils 4a, 4b alternately drive the switching elements 2, 3 with the polarity of the symbol • as shown in the figure, and are connected to the gates of the switching elements 2, 3 through the respective resistors 14 and 1 3 '. Between the source and the source. (In order to show the combination of the primary coil and secondary coil of CT4, the dotted line is shown in the figure.) However, the equivalent of the second and the third source and the source between the switching elements 2 and 3 is omitted in the figure. Polar body. 64 is a resistor whose one end is connected to the positive electrode of the direct current 1 and is connected to the negative electrode of the direct current 1 through the capacitor 66. Reference numeral 67 denotes a diode whose anode is connected to the connection point of the resistor 64 and the capacitor 66, and whose cathode is connected to the connection point of the switching elements 2 and 3. 6 8 is a flat-shaped bidirectional directional trigger diode (hereinafter referred to as a trigger diode, such as N413 made by NEC, etc.) connected to the connection point between the resistor 64 and the capacitor 66. ), And is connected to the gate of the switching element 3 through the resistor 69. P1 00 is a pp measurement circuit for the discharge lamp load circuit L1 〇〇 In this PP measurement circuit P1 00, 50 and 51 are capacitors connected in series, and one of the valleys 50 is connected to the DC power supply 1 The other end of the capacitor 51 is connected to the connection point of the anti-current coil 5 and the discharge lamp 6. 5 2 is the anode connected to the negative pole of the DC power supply 1, and the cathode is connected to the capacitor 50 and the capacitor 51.

2148-5173-PF (N) .ptd Page 11 569649 V. Description of the invention (9) Diode with 2 contacts. In this way, the peak capacitor 51 and the capacitor 50 applied between the anti-current coil 5 and the discharge lamp 6 = 00 'and the negative electrode bl 〇〇 of the DC power source i (illustrated next to the connecting pole of the diode 52) = Voltage), which is inversely proportional to the valley value of L ^ frying electricity, and is taken out on the anode of diode 56. P1 10 is the PP detection circuit for the discharge lamp load circuit L110. In the pp output circuit PΠ0, 53 and 54 are capacitors connected in series, terminal j, to the negative pole of the DC power source i, and the other end of capacitor 54 is connected. To the connection point of the second machine coil 9 and the discharge lamp 10. 55 is a diode whose anode is connected to the negative electrode of the DC power supply 1, and the cathode is connected to the connection point of the capacitor 50 and the capacitor 51. In this way, between the connection point & 100 of the anti-current coil 9 and the discharge lamp 10 and the negative electrode b 100 of the machine power source 1 (illustrated next to the anode of the diode 55) = The voltage (peak t0 peak voltage) is taken at the anode of the diode 57 as the inverse ratio of the capacitance value of the capacitor 54 and the electro-valley 3. 5 6 57 is that the cathodes are connected to each other, and the anodes are connected to the pp test circuit P100 and P110 diodes respectively. H1 00 is a holding circuit, and the cathode is connected to the diodes 56 and 57, the contact, the zener diode 61, and the anode connected in series to the Zener diode and the anode of the power supply 1 The resistance 6 0 and the resistance 5 9. The anode is connected to the diode 63 of the gate of the switching element 3, the cathode is connected to the negative electrode of the DC source 1, and the anode passes through the cathode of the diode 6 3 and the resistance 6 4 , Connected to the positive pole of the DC power source 1, the gate is connected to a gate 62 (thyritor) of the connection point of the resistor 60 and the resistor 6 丄, to the diode 56 and the diode

569649 V. Description of the invention (10) Connection point of cathode of body 57. In this way, pp measured the capacitance 58 of the 3 n negative pole of the circuit to constitute the electric towers Pΐϋϋ and P11〇. The voltage is on the two ends of the capacitor 5 8 and Mt. Yamauchi Electricity from the same party

Ri〇〇 series discharge lamp load circuit L100 voltage. It is connected to the discharge lamp 6 and the electric H = circuit 'and is connected by the anode 杌 *, the striker ^: the diode 202 of the connection point of the taxi, the taxi 7 and from its dangerous pole to the straight SIL power supply 1 bin ^ capacitor 204 Resistor 2 connected in parallel is negative. 5 Electricity :,: °: The charging section 'and ▲ ± unjustified 20 5 Capacitor 20 03 connected to the cathode of diode 202 and a spot DC power source connected to the other end of capacitor 203 ^ ^ The differential between the negative electrodes is 22G, the collector is connected to the resistor 64 = "the connection point of the pole body 65, the emitter is connected to the DC power source ^ Ϊ = connected to the structure ^ R110 series discharge lamp load circuit LU0 The reset circuit, and the charging is formed by connecting the anode to the discharge lamp 10 and the capacitor 2 of the connection point 2 of the capacitor 丨 2 and the capacitor 214 connected to the negative electrode of the DC power supply 1 from the straight cathode 邙 / A resistor 215 connected in parallel with the capacitor 214. One end is connected to the capacitor 21 3 of the cathode of the diode 2 ° 12, and the resistance 2 20 is connected to the other end of the capacitor 21 3 and the negative electrode of the DC power supply 1. The differential section, the collector is connected to the connection point of & resistance 64 'and the diode 65, the emitter is connected to the negative electrode of the DC power supply 1, and the base is connected to the connection point of the capacitor 213 and the resistor 220 as the control section The transistor 221 is used as the resistor. The resistor 220 and the transistor 221 are shared with the reset circuit R100. FIG 1, FIG. 2 will be described. Section 2 (a) based reset circuit in FIG RlOO, voltage waveforms of the respective capacitances of 04,214 R110, the first

569649 V. Description of the invention (11) 2 (b) The figure is a differential voltage waveform that differentiates the figure 2 (a) and flows to the resistor 2 2 0. In the first figure, once the DC power supply 1 is turned on (t 丨 in the second figure), the current flows through the path of the resistors 2 30, CT4, the anti-current coil 5, the filament of the discharge lamp 6, and the diode 202, such as As shown in Figure 2 (a), the voltage of the capacitor 204 of the charging section rises. The change in the rising voltage is obtained by the differential portion composed of the capacitor 203 and the resistor 220, and the differential voltage waveform shown in FIG. 2 (b) is obtained at the resistor 22o. Similarly, a current flows through the path of the resistor 230, CT4, the anti-current coil 9, the filament of the discharge lamp 10, and the diode 212, and the voltage of the capacitor 214 of the charging section rises as shown in FIG. 2 (a). The change of this rising voltage is obtained by the differential portion composed of the capacitor 213 and the resistor 220, and the differential voltage waveform shown in Fig. 2 (b) is obtained at the resistor 22o. In this way, according to the differential voltage waveform shown in FIG. 2 (b), the transistor 2 2 1 is turned on during the maximum T1. During this period, the DC power source 1 passes through the diode 65 and flows to the capacitor 66. The current is bypassed on the transistor 221. In this way, once the period of T1 has elapsed, the transistor 2 2 1 is turned off, and the DC power source 1 is charged to the capacitor 6 6 through the resistor 6 4. Once the charging voltage of the capacitor 66 rises by triggering the breakdown voltage L of the diode 68, it is charged to the charge of the capacitor 66, that is, by triggering the diode 68, the resistor 69, the resistor 13, and the secondary coil 4b to discharge. As a result, the voltage generated by the discharge current on the resistor 1 3 and the secondary coil 4 b causes the switching element to be turned on. ”、、 At this time’ is charged to 7, 11, 8, 12 of the capacitor through the resistance 230

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Two are discharged on the path of ^ 4, switching element 3. In this way, the switching element 3 is turned on again by the voltage generated on the human coil 4b to turn the switching element 3 on and the secondary coil to turn the switching element 2 off. On the other hand, the voltage of the capacitor 66 is reduced by discharging, so the diode 6 8 is triggered to turn off. The current flowing through CT4 'is reversed after a period determined by the circuit constants of the discharge lamp load circuits u00 and [11〇, so the direction of the current is reversed, so the next time the π element 2 is turned on, and the switching element 3 is turned into 〇FF. After that, the switching element 2 ^ 'causes the discharge lamps 6, 1 and 0 driven by the parent to alternately drive at a high frequency. However, the charge of the electric command 66 is discharged through the diodes 6 and 7 when the switching element 3 is turned on, so when the oscillation continues, the triggering diodes 6 and 8 are not turned on again. Once the discharge lamp is turned on, it will continue to be charged on the capacitor 204 2 14 'through the diodes 202 and 212, so if the resistors 205 and 215 which are the discharge resistors of the capacitors 204 and 214 are appropriately selected,' As shown in Figure 2 (a), the voltage of capacitors 204 and 214 becomes a DC voltage with almost no change, and the differential voltage across the resistor 2 20 is also shown in Figure 2 (b). As shown above, it is approximately zero, and the transistor 222 is not turned on. Here, for example, "if the discharge lamp 6 becomes the end of its life due to the consumption of the discharge substance of the filament, the voltage across the discharge lamp 6 rises compared to when it is normally lit", and the voltage change is measured as p p?丨 〇 〇 The measured anode voltage of diode 5 6 increases, and the voltage of capacitor 58 also increases. The zener diode 61, resistor 60, and resistor 59 are appropriately selected, and the thyristor 62 is not turned on by the voltage of the capacitor 5 8 obtained when the discharge lamp is normally lit, and becomes a When the voltage at the end of its life rises, the capacitor 58

2148-5173-PF (N) .ptd Page 15 569649 V. The voltage obtained on the description of the invention (13) to turn on. If the gate fluid 62 is turned on, the current from CT4 to 9 · Α & 1 Qr 攸 14 secondary coil 4b, through resistor 1 3, to the gate of switching element 3, read — R9 iEb. ^ ΙΛ The motor is bypassed by a pole body 63 and the brake fluid 6 is bypassed, so the switching element 3 is turned off, and the vibration of the switching circuit 2 is turned off. Even if the oscillation is stopped on the fluid 62, the holding power k continues to flow through the resistance 64, and this state is maintained until the DC power source is interrupted. Therefore, the discharge lamp 6 can be prevented from operating in a state where abnormal discharge continues. Here, as shown in FIG. 2 (a), at time ^, once the discharge lamp 6 is unplugged in order to replace the discharge lamp with a normal discharge, the charging path is from DC current = 1 to capacitor 20 4 It is cut off, so the charged electric charge 电容 of the capacitor 204 passes through the resistor 20 5 and is discharged, and as shown in FIG. 2 (a), the charge decays. Fig. 2 (b) shows the differential voltage waveform obtained at the resistor 220 at this time. In this way, at time 7: 3, once the discharge lamp that can be normally lit is installed on the discharge lamp 6, as shown in FIG. 2 (a), 'on the capacitor 204, the DC power supply 1, the resistance 23 〇, CT4, anti-current coil 5, filament of the discharge lamp 6, and the path of the diode 2 02, the charging current flows, and the voltage of the capacitor 204 rises. The rise and change in the voltage of the capacitor 204 is differentiated by the capacitor 203 and the resistor 220, and the differential voltage waveform shown in Fig. 2 (b) is obtained on the resistor 220. By this differential voltage, the transistor 2 2 1 is turned on during the maximum T4 period, and the current flowing through the resistor 64 to the gate fluid 62 is bypassed, so the current of the gate fluid 62 becomes below the holding current and is closed, and the protection is released. The stop of circuit Η 100 0 is maintained. After the Τ4 period, because the transistor 22 1 is turned off, the current passes through the second

Page 16 2148-5173-PF (N) .ptd 569649 V. Description of the invention (14) The pole 65 ′ flows to the capacitor 66, and by triggering the diode 68 to turn on, it is again formed by the switching elements 2, 3 The converter circuit oscillates at a high frequency to light the discharge lamp. In this way, when the voltage of the charging section rises and changes, the stop holding of the protection circuit H100 is released. In the discharge lamp exchange operation of lighting equipment, the period from when the abnormal discharge lamp is removed to when the constant discharge lamp can be installed (τ 3 in Fig. 2 (b)), since the period is short, it is better to set this period Let me explain. As described above, the resistors 205 and 21 5 connected to the capacitors 20 4 and 214 play a role of discharging the charge charges of the capacitors when the discharge lamp is unplugged. That is, if the resistance values of the resistors 2 05 and 2 1 5 become larger, the period T2 shown in FIG. 2 (a) becomes larger, and from when the abnormal discharge lamp is removed to when the constant discharge lamp can be installed. The period T3 becomes longer. If the resistance values of the resistors 2 0 5 and 2 1 5 become smaller, a large ripple voltage (j ^ ppie) voltage is generated on the voltage of the capacitors 204 and 214 even when the discharge lamp is turned on, thereby generating a voltage on the resistor 220 The voltage is differentiated and the transistor 221 is turned on. Even if the discharge lamp is abnormally discharged, the oscillation of the converter circuit cannot be kept stopped on the thyristor 62. The ripple interference voltage generated on the capacitors 204 and 214, and the product of the capacitor 204 and the resistor 205, the capacitor 214, and the resistor 215 are easily generated if they are less than 10 times. Therefore, even if the discharge lamp is abnormally discharged, the oscillating fluid 62 avoids the failure to keep the converter circuit from oscillating and stops, and makes the resistors 205, 215 as much as possible.

2148-5173-PF (N) .ptd p. 17 569649

The resistance value becomes smaller, and for the selected capacitor 2G4 and the resistance m], the interval T2 becomes shorter and the T3 becomes shorter. The product of the oscillation period of 10 times and the resistance 215 is the conversion capacity 214. The pulsating stem is at ¥ At, so the capacitor 204 and electrical action can be suppressed. Dynamic interference voltage ’and can prevent the unnecessary of the transistor 221

2mS。 S period, for example, if the oscillation frequency is 5 and its 10 times is 0.2mS. The coercive period is 20 // fm The period T3 from the discharge lamp to the time when the normal discharge lamp can be installed, which exceeds approximately los one by one, the exchange of the normal discharge lamp will reduce the practicality of t operation, so the capacitor is selected The electrical capacity of 20 4? 214 and the resistance values of resistors 204 and 214, the respective products of capacitor 204 and capacitor 20 5, capacitor 214 and resistor 215 are approximately 10 seconds or less. The practicality of the work performed during the exchange operation is improved. As described above, according to the first embodiment, the circuit is measured in pp for reasons such as the life of the consumption material of the filament discharge material of the discharge lamp. P1 10 and the function of holding circuit H1 00 to stop holding the oscillation of switching elements 2 and 3, even if the AC power source 丨 a or DC power source 1 is continued without interruption, if the discharge lamp is replaced by a normal discharge lamp, It is also able to automatically re-ignite the discharge lamp. By this, there is no need to cut off the power of other discharge lamps or machines connected to the same power source as the lighting device, and it is possible to perform a father change or check of the discharge lamp. endure Effect and not on each lighting device, provided blocking AC or DC power supply of a large and expensive switch, the lighting apparatus can be miniaturized and inexpensive.

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Because the resistors 20, 5, 215 are connected in parallel to 204, 214, even if the capacitor power supply of the relay unit is not blocked, the discharge lamp that is not normally lit is set to the source: When the DC is used, the towel can be shortened to release. The time until the discharge lamp of the above-mentioned protection circuit ^ can make the ordinary illuminator lamp: practicality in the action of moving, and convenient]; ::: the value of the resistance of the operation becomes a subtractor The second circuit is more than two, that is, large mm, so even if the parent current power source la or DC power source i is put in about ^ times of the ^ period, the production time * is replaced with the discharge lamp at the normal point, about two In the case of a discharge lamp produced by the lamp process, # can release the vibration stop of the above-mentioned protection circuit: at 2 o'clock, it can improve the practicality of the operation of the discharge lamp exchange of ordinary lighting appliances and temples. However, in the above description, it has been described that the discharge lamp 6 becomes abnormally lit. However, the same effect as when the discharge lamp 10 is abnormally discharged, and the replacement of the discharge lamp with a normal discharge is obtained. Let's also say that the case where the discharge lamp load circuit is connected in parallel, but even in the case of one or three or more solid, the same effect can be obtained by setting a reset corresponding to the discharge lamp load circuit. The circuit is also shown in Fig. 3. Fig. 3 is a circuit diagram showing the structure of a discharge lamp in accordance with the second embodiment of the present invention. In the figure, the same force as 4 J is the same as that in the first figure of Embodiment 1.

569649 V. Invention Description (17), and its description is omitted. 20 0 is the resistance as an impedance element newly inserted between the connection point of the discharge lamp 6 and = ^ 7 and the diode 202, and 201 is the anode and DC power source connected to the pole 202 The resistance of the anti-element between the negative electrode. 210 and 211 are resistors on the reset circuit ru0, and 200 and 201 are resistors on the reset circuit R100. In the figure, the voltage of the anode of the diode 202 becomes the voltage of the connection point between the discharge lamp 6 and the electricity = 7, and the voltage is divided by the resistance of 200 and the resistance of 2001. 'So diode 20 2. Capacitor 204 can use components with small withstand voltage characteristics, and it can be cheap and miniaturized. However, it is also possible to use capacitors instead of resistors 200, 200, 2ΐ, 2 、 to divide the voltage. Embodiment 3 Fig. 4 'shows the present invention. # The circuit diagram of the structure. The same reference numerals are attached to the same parts as those in the first embodiment of the discharge lamp lighting device of the third embodiment, and the description thereof is omitted. Fig. 4 'Its structure is to cut the secondary coils 5a, 5b of the CT4 coil 5 in Fig. 2, and drive the switch through the resistor 1 / 1A ^ 9 Q η ^ ^ ^ ^ ^ The elements 2 and 3 are similarly provided with the over-resistances 16 and 15 on the current-resistant coil 9 to drive the switching elements 2 and 3 in parallel. In this structure, since the port 4 can be omitted, it can be made inexpensive and downsized. The same effects as those of the second embodiment were obtained. [Effects of the Invention] According to the present invention, a woman includes a direct current power source, and has a pair of tangentials that converts the direct current source 仏 and the seventh direct current into a high-frequency current.

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IM 569649 V. Description of the invention (18) A converter circuit composed of a half-bridge circuit of a replacement element, a discharge lamp load circuit formed by a series circuit of a reactor, a discharge lamp, and a capacitor, and a discharge lamp lighting device, It includes a protection circuit that detects the abnormal state of the discharge lamp and stops the oscillation of the converter circuit, and a reset circuit that releases the protection circuit from being stopped. The reset circuit includes a filament through the discharge lamp. , A charging section formed by connecting a diode and a capacitor between the positive and negative poles of a DC power supply, a differential section formed by a capacitance and a resistance that differentiates a voltage of the charging section, and an output of this differential section. The reference is used to control the current flowing through the protection circuit, so after stopping the oscillation of the switching elements 2 and 3 for reasons such as the life of the consumable substance consumed by the filament discharge substance of the discharge lamp, When the AC power or DC power is continuously turned off, if the discharge lamp is replaced with a normal discharge lamp, the discharge lamp can be automatically turned on again. Therefore, there is an effect that the discharge lamp can be exchanged or checked without having to shut off the power of other discharge lamps or equipment connected to the same power source as the lighting device. Since it is not necessary to provide a large and expensive switch for blocking the AC power supply or the DC power supply to each lighting device, the lighting device can be miniaturized and inexpensive.

2148-5173-PF (N) .ptd Page 21 569649 Brief Description of Drawings Figure 1 is a circuit diagram showing a discharge lamp lighting device according to Embodiment 1 of the present invention. Figures 2 (a)-2 (b) are waveform diagrams showing the operation of the discharge lamp lighting device according to the first embodiment of the present invention. Fig. 3 is a circuit diagram showing a discharge lamp lighting device according to a second embodiment of the present invention. Fig. 4 is a circuit diagram showing a discharge lamp lighting device according to a third embodiment of the present invention. Fig. 5 is a circuit diagram showing a conventional discharge lamp lighting device. Fig. 6 is a circuit diagram showing the structure of a DC power supply of a conventional discharge lamp lighting device. [Symbol description] 1 ~ power supply, 2,3 ~ switching element; 4 ~ converter (CT); 4 a, 4 b ~ 4 secondary coil; 5, 9 ~ current-resistant coil; 6, 1 0 ~ discharge Lamp; 7, 11, 12 ~ Capacitor; 1 3,1 4,1 5,1 6 ~ Resistor; 58 ~ Capacitor; 59,60 ~ Resistor; 6 1 ~ Zener diode; L100, L110 ~ Discharge lamp load Circuit

2148-5173-PF (N) .ptd Page 22 569649 Brief description of the diagram 6 2 ~ gate fluid; 63, 65, 67 ~ diode; 64, 69 ~ resistor; 66 ~ capacitor; 6 8 ~ trigger diode Body; P1 00, P110 ~ PP detection circuit; Η100 ~ Keep circuit; 200, 201, 205 ~ Resistor; 202, 212 ~ Diode; 20 3, 20 4 ~ Capacitance; 2 1 0 > 2 1 1 > 2 1 5 ~ resistor; 213, 214 ~ capacitor; 2 2 0 ~ resistor; 2 2 1 ~ transistor; 2 3 0 ~ resistor; R100, R110 ~ reset circuit.

2148-5173-PF (N) .ptd Page 23

Claims (1)

569649 A discharge lamp lighting device comprising a current-resistant power converter circuit with a high-frequency current-resistant coil; 丄 A half-bridge circuit having a direct current supplied from a direct current power source and converting a pair of switching elements; a series connection of a capacitor A discharge lamp; and a discharge lamp load circuit, which are characterized by including: a holding circuit to measure the oscillation of the converter circuit of the discharge lamp; a reset circuit to release the protection circuit and the reset circuit includes ; The abnormal discharge state, and stop and stop maintaining; the charging section is made of the diode and capacitor connected between the positive and negative poles of the DC power supply through the filament of the above discharge lamp; The capacitance and resistance of the voltage differential of this charging section are formed: and the control section 'uses the output of the differential section as a reference to control the current flowing through the protection circuit. 2. —A kind of discharge lamp lighting device, including DC power supply; converter circuit 'is a half-bridge circuit with a pair of switching elements that converts DC power supplied from DC power to high-frequency current; Coils; discharge lamps; and 2148-5173-PF (N) .ptd page 24 569649 The discharge lamp load circuit is a series circuit of capacitors and is characterized in that it includes: a protection circuit that detects the abnormal discharge of the discharge lamp to maintain the oscillation of the converter circuit; and a T reset circuit 'to release the stop of the protection circuit; and The reset circuit includes: an impedance element, which is connected between the positive and negative poles of the DC power supply through the filament of the discharge lamp, and is connected in series in plural; a charging part, which is a diode that charges the voltage of this impedance element The differential section is formed by the capacitance and resistance that differentiates the voltage of the charging section; and the control section uses the output of the differential section as a reference to control the current flowing through the protection circuit. 3. The discharge lamp lighting device according to item 2 of the scope of patent application, wherein the impedance element is a resistor. 4 · The discharge lamp lighting device 'according to item 1, 2, or 3 of the scope of patent application, wherein a resistor is connected in parallel to the capacitor of the charging section. 5 · The discharge lamp lighting device according to item 4 of the scope of the patent application, wherein the product of the electrical capacity of the capacitor of the charging section and the resistance value connected in parallel to the capacitor is approximately the oscillation period of the converter circuit. More than 10 times. 6 · The discharge lamp lighting device according to item 1, 2, or 3 of the scope of patent application ', which includes a plurality of discharge lamp load circuits and output drive 2148-5173-PF (N) .ptd Page 25 569649 6. The scope of the patent application for a pair of secondary coil voltage switching elements, each pair of which is set on the anti-current coil of the discharge lamp load circuit, and the above A pair of switching elements are connected in parallel through each current limiting element. 2148-5173-PF (N) .ptd Page 26