TW415159B - Discharge lamp lighting device - Google Patents

Abstract

To simplify detecting circuit constitution and reduce circuit loss by commonly using detecting resistance for detecting high frequency current flowing in a discharge lamp. A discharge lamp lighting device comprises: an inversion circuit IV for generating a high frequency power by the oscillation output signal from the IV control integrated circuit; a discharge lamp LA for lighting a lamp by a high frequency power; an error amplifier EA for amplifying a voltage error between the output of an integration IN obtained by integrating the voltage on the both ends of a detection resistor R6 of a high frequency current flowing to a discharge lamp LA and a reference voltage; an emission-less detection circuit EL for detecting the emission-less lighting while outputting the voltage for controlling the oscillation frequency of the IV control integration circuit so that the voltage error is zero; and an abnormal detection circuit DT for outputting an abnormal signal based on the high frequency current flowing to the detection resistor R6.

Description

The present invention relates to a discharge lamp lighting device for lighting a discharge lamp with high-frequency power formed by an inverter circuit. More specifically, the present invention relates to a discharge lamp lighting device having a simple structure of an abnormality detection circuit and low circuit loss. Device. Fig. 7 is a circuit diagram of a conventional discharge lamp lighting device; Fig. 8 is a high-frequency voltage waveform diagram. In Figure 7, E is a DC power supply: iv is an inverting circuit that converts DC voltage to high-frequency voltage; LA is an electric discharge lamp with preheating electrodes FI, F2 is a lamp for limiting the discharge lamp la Current choke (ballast choke); C5 is a coupling capacitor (C0UpHng capacit〇r) connected between choke τ and preheating electrode F1 is a starting capaci tor connected to both ends of the discharge lamp LA . NP is a non-lighting detection circuit that detects the non-lighting of the discharge lamp LA; EL is a circuit that detects excessive power consumed by the discharge lamp LA and outputs a voltage that controls the oscillation frequency by not emitting (emissi_n_iess) lighting. No emission detection circuit. Next, the circuit structure of the inverter circuit IV will be described. Q2 and Q3 are M0SFETs used as switching elements, and M0SFETQ2 has its drain connected to a DC power source, while its source is connected to the drain of M0SFETQ3, and its gate Connect to pin 2 of the IV control integrated circuit IC2 described below. M0SFETQ3 has its source connected to the DC power source E through a sense resistor R6, and its gate connected to pin 4 of the IV control integrated circuit IC2. R1 is the starting resistor connected to the DC power supply E; C3 is the control power capacitor connected to the starting resistor R1 and earth; ZD is the constant voltage diode that stabilizes the voltage of the capacitor C3 for control

C: \ Program Files \ Patent \ 2148-2160-P.ptd page 5 415159 V. Description of the invention (2) regulation diodeh IC2 is a control integrated circuit that controls the inverting circuit ^; 1 is connected to the control power capacitor C3 The power input terminal of the connection point with the starting resistor R1; 2, 4 are voltage output terminals that output the driving voltage of M0SFETQ2, Q3; 3 is the reference voltage output terminal; 5 is the abnormality detection terminal; 6 is the output that determines the resonance frequency Current output terminal for current (main oscillation resistance connection terminal); 7 is the current input / output terminal for charging and discharging of capacitor C4. Next, the structure of the non-lighting detection circuit N p will be described. Non-lighting detection circuit NP is a non-lighting circuit that detects the discharge lamp LA. It consists of a resistor R7, R8 that divides the high-frequency voltage, a rectifier diode D6, and a smoothing capacitor. capacitor) C9. EL is a non-emission detection circuit 'its preheating electrode at the end of the lifetime of the fluorescent lamp becomes difficult to emit electrons, and it detects a non-emission state such as voltage increase' while controlling the oscillation frequency of the IV control integrated circuit IC2 . Next, the structure of the non-emission detection circuit EL will be described. The non-emission detection circuit EL includes: a main oscillation resistor R2, R3 and a capacitor C4, which determine the current flowing from the voltage output terminal 6; a detection resistor R 6, which detects a high-frequency current flowing to the discharge lamp LA; an integrating circuit IN, The high-frequency voltage detected by the detection resistor R 6 is averaged and is composed of a resistor R 5 and a capacitor C 6; and an error amplifier EA. And this error amplifier EA includes: voltage-dividing resistors R9, R10 'connected in series between the connection point of resistor R1 and capacitor C3 and the negative pole of power supply E; and an operational amplifier IC3 from resistor R9'R10 The reference voltage at the connection point is connected to a non-inverting

C: \ Program Files \ Patent \ 2148-2160-P.ptd page 6 415159 V. Description of the invention (3) Phase input terminal 'Integrating circuit IN and resistor 6 connected to current output terminal 6 of IV control integrated circuit IC2 R3, diode D5, and capacitor C2 are connected to the inverting input terminal 'so that the output voltage of the integrating circuit IN is equal to the reference voltage. Next, the operation will be described with reference to Figs. 7 and 8 "First, the operation of the inverter circuit IV will be described. When the DC power supply e 'is turned on, the voltage of the control power supply capacitor C3 is applied to the pin 1 of the IV control integrated circuit IC2 by the current supplied from the DC power supply E through the starting resistor R1. When the voltage of the control power supply capacitor C3 rises and reaches the operating voltage of the iv control integrated circuit ic2, the IV control integrated circuit iC starts to oscillate. By this oscillation, the voltage from the pin 2 of the IV control integrated circuit IC2 is applied to the gate of the half bridge type inverting circuit iViM0SFETQ2 alternately at high frequency, and the self-pin 4 is applied to M0SFETQ3, and M0SFETs Q2 and Q3 are turned on / off alternately (ON / OF F), and the inverter circuit iv oscillates at a high frequency. Thereby, a high-frequency current flows through the series circuit of the choke T, the coupling capacitor C5, the preheating electrode F1, the starting capacitor C6, and the preheating electrode F2. At this time, there is a relationship between the capacitance of the capacitor C5 and the capacitance of the starting capacitor C6 ', and the resonance high voltage is generated in the starting capacitor C6 through the series resonance of the choke T and the starting capacitor C6, and this resonance high voltage It is applied to the discharge lamp LA so that the discharge lamp LA is turned on. When the normal discharge lamp is connected, the non-lighting detection circuit Np rectifies the high-frequency voltage divided by the resistors R7 and R8 through the diode D6 and the capacitor C9, and outputs a DC voltage that is advection, and then inputs To 丨 ^ control the abnormal output terminal 5 of the integrated circuit IC2. This voltage is set to be lower than the abnormal output C: \ Prograra Files \ Patent \ 2148-2160-P, ptd page 7 415159, description of the invention (4) The operating voltage of terminal 5 is lower, and IV controls the integrated circuit IC2 Continue to pan normally. ___ On the other hand, at this time, the frequency-dependent voltage shown in FIG. 8 is generated in the detection resistor R6. This is averaged by the integration circuit 丨 N, and this voltage is input to the error amplifier that does not transmit the detection circuit EL. Inverting input terminal of EA's operational amplifier IC3. However, the oscillation frequency of the IV control integrated circuit iC2 is determined by the amount of electric valleys of the capacitor and the current value flowing from the current wheel output terminal 6 of the IV control integrated circuit 1C2 to the main oscillation resistors R2 and R3, and this The larger the current value, the higher the oscillation frequency. And the current flowing from the current output terminal 6 to the resistor R3 is changed by controlling the output voltage of the operational amplifier IC3 to control η to control the exhaustion frequency of the integrated circuit IC2. Therefore, the control of the oscillation frequency of the 'IV control integrated circuit IC2 is to control the output voltage of the operational amplifier IC3 by the output voltage of the integrating circuit IN, and is equal to the reference voltage of the non-inverting input terminal of the operational amplifier IC3. This result 'keeps the average value of the high-frequency current flowing through the detection resistor R6, that is, the sum of the power consumed by the discharge lamp LA, to be constant. In this way, the non-emission detection circuit EL output control I v controls the voltage of the oscillation frequency of the integrated circuit IC2 so that the average current flowing at a high frequency to the detection resistor is maintained at the value set by the non-emission detection circuit EL. Therefore, Even when the discharge lamp LA is at the end of its life and consumes abnormal power, the detection circuit EL is not emitted, and the oscillation frequency of the π control integrated circuit IC2 is controlled to flow to the high frequency of the detection resistor R6.

415159 V. Description of the invention (5) The average current of ----- is kept at the set value. However, if the life of the discharge lamp LA is as old as > + terminal or bad, then the electric valley with the coupling valley device C5> the resistor T of the starting capacitor C6 and the LC of the starting capacitor C6 will be in contact with the & The voltage is applied to the discharge lamp LA, but when the lamp cannot be turned on, the sum of the voltage across the resistance state and R8 becomes abnormal. J_ because the output voltage of the non-lighting detection circuit Np is higher than the control integrated circuit IC2 Since the operating voltage of the abnormality detection terminal 5 is high, r controls the integrated circuit 1C2 to stop vibrating. The oscillation stop state is maintained by a current supplied from the DC power source E through the starting resistor R1. Secondly, if the discharge lamp LA is at the end of its life and becomes a non-emission lighting state that consumes excessive power, it is because the discharge lamp is in a non-emission state in which the electron emission material coated on the pre-electrode F 2 and F 2 is consumed. : Lighting, the voltage of the discharge lamp LA rises, and the power of the discharge lamp "is too large. Although this excessive power system is detected from high to high current flowing to the detection resistor R6, this voltage is measured by the integrating circuit 〇 Divide the average and input to the inverting input terminal of the operational amplifier IC3 of the error amplifier EA that does not emit the detection circuit EL. The error amplifier EA is used to make the operational amplifier IC3 compared to normal discharge when lighting. The output voltage of the control circuit IC2 is reduced, and the oscillation frequency of the integrated circuit IC2 is high, so that the sum of the power consumed by the discharge lamp LA is kept constant in the same way as in normal lighting. The discharge lamp lighting device uses different circuits to constitute a non-lighting detection circuit NP that detects the abnormality of the discharge lamp LA at the end of its life or is defective, etc., and detects the discharge lamp LA at the end of its life. No launch

11 ^ C: \ PrograraFiles \ Patent \ 2148-2160-P.ptd page 9 415159 V. Description of the invention (6) When the lamp is turned off and no light is emitted, the discharge lamp power becomes too large and the abnormal non-emission detection circuit EL, Therefore, the circuit becomes complicated, and the loss in the detection circuit becomes a relatively large problem. In the normal discharge lamp connection state, if the power supply E is turned on, the resonance voltage is generated in the starting capacitor C6 by the series resonance of the choke T and the capacitor C6, but the oscillation frequency setting of the integrated circuit IC2 is controlled by IV The higher the controlled resonance voltage is, the larger the resonance current flowing through the detection resistor R 6 is. Therefore, when the resonance voltage of the starting capacitor C6 is required to be high for the discharge lamp LA to light, 'the output voltage of the integrating circuit IN until the discharge lamp LA is turned on', that is, the voltage of the capacitor C8 reaches the operational amplifier IC3 Because the reference voltage of the control circuit is not transmitted, the EL system controls the oscillation frequency of the IV control integrated circuit IC2, so that the output voltage of the integration circuit IN is maintained at this reference voltage, so the oscillation frequency of the IV control integrated circuit IC2 is fixed. Where the resonance is not enhanced and the discharge lamp LA is not lit "The purpose of the present invention is to provide a discharge lamp lighting device in order to solve the above-mentioned problems. The structure of the detection circuit for detecting the abnormality of the discharge lamp is simple, and the circuit loss is small. , And when the normal discharge lamp is connected, you can place the light. The discharge lamp lighting device according to the present invention includes: an IV control integrated circuit having an abnormality detection terminal, and an oscillation output signal is turned on; an inverting circuit is turned on by using the IV to control the oscillation output signal of the integrated circuit ( on) / OFF (OFF) switching element (sw i tch i ng e 1 emen t), and convert the voltage of the DC source into high-frequency voltage; the discharge lamp, the high-frequency power from this inverter circuit to light ; No emission detection circuit, detects emission-less lighting, and simultaneously outputs and controls the above-mentioned IV control integrated circuit

C: \ PrograraFiles \ Patent \ 2148-2160-P-ptd page 10 415159 V. Description of the invention (7) The voltage of the oscillation frequency of the circuit, so that the high-frequency power consumed by the discharge lamp is equal to the reference voltage; and abnormal A detection circuit having a detection resistor for detecting a high-frequency current flowing to the discharge lamp, a resistor and a rectifier diode connected in series between the switching element and the abnormality detection terminal, and connected to the abnormality detection A smoothing capacitor between the terminal and the DC power supply; the IV control integrated circuit stops the oscillation signal when the abnormal signal is input to the abnormal detection terminal, and the high frequency at both ends of the discharge lamp A phase ad vane ing capacitor is connected to the input side of the electric power and a phase advancing current flowing through a high frequency phase advancing current. It also includes a mask circuit, which is connected to the output of the integration circuit that does not emit the detection circuit, and is driven by the current output from the main oscillation resistance connection terminal that determines the oscillation frequency of the IV control integrated circuit. And for a certain time necessary from the time when the DC power is turned on until the discharge lamp is turned on, the above-mentioned non-emission detection circuit is not caused to operate. Furthermore, the 'mask screen circuit includes a timer, which rotates the input current at a certain time. It consists of capacitors and resistors; and a transistor, which is driven by the current output by the timer to short-circuit the integration circuit at a certain time. In addition, the 'mask circuit includes: a timer' composed of a capacitor and a resistor which will output an input current at a certain time; a first transistor driven by the current output by the timer; and a second transistor, As a result, the first transistor is driven to drive the short circuit of the integration circuit at a certain time.

C: \ Program Files \ Patent \ 2148-2160-P, ptcl page 11 415159 Five 'invention description (8) [Inventive embodiment] The first embodiment Fig. 1 shows the discharge lamp lighting of the first embodiment Device circuit diagram; Figure 2 is a high-frequency voltage waveform diagram. In Figure 1, 'E is a DC power supply; IV is an inverting circuit that converts a DC voltage into a high-frequency voltage; LA is an electric discharge lamp with preheating electrodes FI and F2; T is a limited discharge lamp LA Ballast choke of the discharge lamp current; C5 is a coupling capacitor connected between the choke τ and the preheating electrode F1; C6 is a starting capacitor connected to both ends of the discharge lamp LA ( star ting capaci tor). EL is a non-emission detection circuit that detects a non-emission lighting and outputs a voltage that controls the oscillation frequency; DT is an abnormality detection circuit that detects an abnormality of the discharge lamp LA. The inverting circuit IV and the non-emission detecting circuit EL are the same as those in the seventh embodiment shown in the conventional example ', and the description of the structure is omitted. DT is an abnormality detection circuit for detecting the abnormality of the discharge lamp LA, and includes: a detection resistor R6, connected between the source of M0SFETQ3 and the negative electrode of the power source E: a resistor R11 and a rectifier diode D6, connected in series to the detection resistor The connection point between the source of the converter R6 and the MOSFET Q3 and the abnormality detection terminal 5 of the IV control integrated circuit IC2; and the smoothing capacitor C9 connected between the output side of the rectifier diode D6 and the earth. The detection resistor R6 is shared with the non-emission detection circuit EL. Next, the operation will be described with reference to FIGS. 1 and 2. Fig. 2 (a) is a high-frequency voltage waveform diagram that flows to the discharge lamp LA when the discharge lamp is normally lit; and Fig. 2 (b) is a high-frequency voltage waveform diagram when the discharge lamp is not lit.

C: \ Prograin Files \ Patent \ 2148-2160-P.ptd ^ 12 I V. Description of the Invention (9) First, the operation of the inverter circuit IV will be described. If the DC power source e is turned on, the driving current flows through the power source E—starting resistor R1—control power capacitor C3 closed loop of the power source E (c 1 0 s e d 1 ο ρ), and the control power capacitor C3 is charged. The voltage of the control power capacitor C3 is applied to pin 1 of the IV control integrated circuit IC2. 'If the voltage of the control power capacitor C3 rises to reach the operating voltage of the iv control integrated circuit IC 2, the IV control integrated circuit I c starts to oscillate. . By this oscillation, pin 2 of the voltage self-control integrated circuit IC2 is applied to the gate of M0SFETQ2 of the half-bridge inverter circuit IV and the pin 4 is applied to M0SFETQ3 at high frequency. The M0SFETs Q2 and Q3 are turned on / off alternately, and the inverter circuit IV oscillates at a high frequency. In this way, the inverting circuit IV system alternately causes the current to flow through the power source E when the MOSFET Q3 is turned on-the preheating electrode F1-the starting capacitor C6-the preheating electrode F2-the coupling capacitor C5-the choke T-M0SFETQ3-the detection resistor R6 — Closed loop of power supply E, and when M0SFETQ2 is ON, the current flows through the coupling capacitor C5 — Preheating electrode F 2 — Starting capacitor C6 — Preheating electrode FI — M0SFETQ2 — Shunt resistor T — Coupling capacitor C5 The loop is closed, and high-frequency current flows through the series circuit of the choke T, the coupling capacitor C5, the preheating electrode F2, the starting capacitor C6, and the preheating electrode F1. At this time, there is a relationship between the capacitance of the coupling capacitor C5 and the capacitance of the starting capacitor C6 ', and the resonance high voltage is generated in the starting capacitor C6 by the series resonance of the choke T and the starting capacitor C6, and this resonance high voltage is applied The discharge lamp LA so that the discharge lamp LA is turned on. When the normal discharge lamp is connected, the abnormality detection circuit DT generates a second figure.

C: \ ProgramFiles \ Patent \ 2148-2160-P.ptd page 13 415159 V. Description of the invention (10) The high-frequency voltage shown in (a), but the rectification effect of the diode D6 makes the smoothing capacitor The voltage of C9 generally becomes the peak value vi of this high-frequency voltage, and the relationship with the operating voltage V5 of the abnormal output terminal 5 of the IV control integrated circuit IC2 to which the lifting value VI is applied is set to V1 < V5, so the iv control integrated circuit iC2 continues to oscillate. On the other hand, at this time, the high-frequency voltage generated by the detection resistor R6 is averaged by the integrating circuit IN 'and this DC voltage is input to the inverting input terminal of the operational amplifier IC3 of the error amplifier EA. However, the oscillation frequency of the iv control integrated circuit IC2 is determined by the capacitance of the capacitor C4 and the current value flowing from the current output terminal 6 of the IV control integrated circuit IC2 to the main oscillation resistors R2 and R3. The larger the frequency, the higher the oscillation frequency. And the current flowing from the current wheel output terminal 6 to the resistor R 3 is changed according to the change of the wheel output voltage of the operational amplifier IC3 to control the oscillation frequency of the μ control integrated circuit IC2. Therefore, the control of the oscillation frequency of the 'IV control integrated circuit IC2 is to control the output voltage of the operational amplifier IC3 by the output voltage of the integrating circuit IN, and is equal to the reference voltage of the non-inverting input terminal of the operational amplifier IC3. This result 'keeps the average value of the high-frequency current flowing through the detection resistor R6, that is, the sum of the power consumed by the preheating electrodes F1 and F2 of the discharge lamp LA. In this way, the "non-emission detection circuit EL control IV controls the oscillation frequency of the integrated circuit IC2" so that the average current of the high frequency flowing to the detection resistor R6 is maintained at the value set by the non-emission detection circuit EL. Next, the operation will be described in a state where the discharge lamp is at the end of its life or defective, and the discharge lamp is not turned on.

C: \ Prograra Files \ Patent \ 2148-216〇-P.ptd page 14 415159 V. Description of the invention αυ Commercial frequency current flows through the choke τ, coupling capacitor C5, preheating electrode F2, starting capacitor C6 and preheating After the series circuit of the electrode F1, even when the discharge lamp LA is at the end of its life and consumes abnormal power, the detection circuit EL is not emitted, and the control circuit iv controls the integrated circuit 1 (: 2's oscillation frequency ') to flow. The high-frequency average current to the detection resistor R 6 is maintained at the set value. However, if the discharge lamp LA is at the end of its life or is defective, there is a relationship between the capacitance of the coupling capacitor C5 and the capacitance of the starting capacitor 〇6. A high resonance voltage is generated in the starting capacitor C6 due to the series resonance of the choke T and the starting capacitor C6, and this resonance high voltage is applied to the discharge lamp LA, but the discharge lamp LA is not turned on. The detection resistor R6 of FIG. 2 generates a high-frequency voltage as shown in FIG. 2 (b). Under the rectification effect of the rectifying diode, the voltage of the smoothing capacitor C9 generally becomes the peak V3 of the high-frequency voltage, and the peak V3 is applied Of IV The relationship between the operating voltage V5 of the abnormality detection terminal 5 of the control integrated circuit IC2 is set to V3 > V5, so the IV control integrated circuit IC2 stops vibrating. The current is supplied from the DC power supply E through the starting resistor R1 In order to maintain this oscillation stop state, "If the discharge lamp LA is at the end of its life and the discharge lamp la consumes excessive power, the non-emission lighting state" means that the discharge lamp LA is applied to the preheating electrode in the same manner as in the conventional example. Lighting is performed in the non-emission state in the state where the electron emitting material of FI and F2 is consumed, so the voltage of the discharge lamp LA rises, and the error amplifier EA ′ is used to compare the operation of the normal discharge lamp LA with that of the operation to enlarge the operation.

C: \ PrograraFiles \ Patent \ 2148-2160-P.ptd page 15 41515 ^ " ------- Five 'invention description (12) The output of the device IC3 > voltage drops, and v controls the product The oscillation frequency of the circuit IC2 is in a state in which the sum of the electric power consumed by the discharge lamp LA is kept constant as in the normal lighting. As described above, the “abnormality detection circuit DT” refers to the conventional non-lighting detection circuit Np for detecting abnormalities such as the discharge lamp LA being at the end of its life or defective, and when the discharge lamp LA is at the end of its life without lighting. The non-emission detection circuit EL (detection resistor R6) is used to detect that the discharge lamp power becomes excessively abnormal (the detection resistor R6), so that the detection circuit is simplified, and the circuit loss can be reduced. Second Embodiment Fig. 3 is a circuit diagram showing a discharge lamp lighting device of a second embodiment; Fig. 4 is a high-frequency voltage waveform diagram. This embodiment is shown in FIG. 1 showing the first embodiment. 'Phase advancing capaci tor C7 is connected to the input side of the high-frequency power at both ends of the discharge lamp LA. 1 is the same, the description of the structure is omitted, and the operation related to the phase lead capacitor C7 will be described with reference to FIGS. 3 and 4. The operation of the inverter circuit IV is the same as that of the first embodiment. When the discharge lamp is in a normal connection state, the end of the discharge lamp life or is defective, the discharge lamp is not turned on, and when the discharge lamp is not turned on, the high-frequency current and the first In one embodiment, similarly, when M0SFETQ3 is turned ON, 'current is passed through the power source E — preheating electrode F1 — starting capacitor C6 — preheating electrode F2 — coupling capacitor C5 — choke T — M0SFETQ3 — detection resistor R6 —Closed loop of power supply E, and when M0SFETQ2 is ON, make current flow through coupling capacitor C5 — Preheating electrode F2 —Starting capacitor C6 —Preheating electrode FI —M0SFETQ2 —Resistance

C: \ ProgramFiles \ Patent \ 2l48-2160_P.ptd page 16 4i5i59 V. Description of the invention (13) Current transformer T Closed loop of the coupling capacitor C5, and high-frequency current flows through the current transformer T, surface-closure capacitor C5, Series circuit of hot electrode F2, starting capacitor C6 and preheating electrode F1. And the actions after the above actions are the same as the first embodiment. Next, the case where the discharge lamp is switched on and the discharge lamp is replaced will be described. When the right discharge lamp LA is taken out and the discharge lamp LA is removed, the current flowing to the preheating electrodes F 1 and F 2 is cut off, and the high-frequency phase advance current flows only through the choke T, the coupling capacitor C5, and the phase. Series circuit for lead capacitor C7. At this time, the detection resistor R6 in the abnormality detection circuit DT generates a high-frequency voltage as shown in FIG. 4 (a), but the rectification effect of the diode D6 makes the voltage of the smoothing capacitor C9 approximately this high-frequency. The peak voltage V2 of the voltage is set to V2 > V5 in relation to the operating voltage V5 of the abnormal output terminal 5 of the IV control integrated circuit IC2 to which the peak V2 is applied, so the oscillation of the IV control integrated circuit IC2 stops. The oscillation stop state is maintained by a current supplied from the DC power source E through the start resistor ri. As described above, by adding the simple structure of the phase lead capacitor only to the first diagram of the first embodiment ', the same circuit as the first embodiment can detect the removal of the discharge lamp, thereby stopping the oscillation of the inverter circuit IV. Third Embodiment Fig. 5 is a circuit diagram showing a discharge lamp lighting device of a third embodiment. This embodiment is shown in Fig. 3 which shows the second embodiment. A mask circuit MC is provided at the output of the integration circuit IN as an additional circuit. In Fig. 5 'is the same as or equivalent to Fig. 3 shown in the second embodiment

C: \ ProgramFiles \ Patent \ 2U8-2i60-P.ptii page 17

5. The part of the description of the invention (14) is marked with the same symbol ′ to omit its description. The mask circuit Mc includes: the transistor Q8 'is connected to the integrating circuit IN and the emitter is connected to the negative electrode of the power source E; the series circuit of the resistor R12 and the capacitor C11 is connected to the current output terminal of the IV control integrated circuit IC2 6 and the base of transistor q8; and a resistor R1 3 'is connected between the base of transistor q8 and the emitter. The capacitor C11 and the resistor R1 constitute a timer. Next, the operation will be described with reference to FIG. 5. In the connection state of the normal discharge lamp, if the power source E is turned on, as in the second embodiment, a resonance voltage is generated in the starting capacitor C6 through the series resonance of the choke T and the capacitor C6, but the product is controlled by IV. The higher the resonance voltage controlled by the oscillation frequency setting of the body circuit IC2, the larger the resonance current flowing through the detection resistor R6. Therefore, the higher the resonance voltage of the starting capacitor C6 is necessary for the discharge lamp LA to be turned on. If the output voltage of the integrating circuit IN, that is, the voltage of the capacitor C8 reaches the reference voltage of the operational amplifier IC3 until the discharge lamp LA is turned on, the detection circuit EL system controls the IV control integrated circuit I C2 The oscillation frequency keeps the output voltage of the integrating circuit IN at this reference voltage *, so that the oscillation frequency of the IV control integrated circuit IC2 is fixed without enhancing resonance, and the discharge lamp LA is not lit. At this time, the cover The curtain circuit MC takes a sufficient time (for example, 2 to 4 seconds) from the time when the power source E is turned on to the discharge lamp LA is turned on. By shorting the output of the integration circuit IN to Before lighting so that the output of the integrating circuit IN of the operational amplifier IC3 reaches a reference voltage, and thus is not fixed IV control integrated circuit IC2 is an oscillation frequency.

C: \ PrograffiFiles \ Patent \ 2148-2160-P.ptd page 18 415159 Five of the description of the invention (15) That is, 'if the power E is turned on, the current flows through the control power capacitor C3 — IV control integrated circuit iC2 current Output terminal 6-resistor R12-electric coupler C11-base-emitter 4 of transistor Q8 controls the closed loop of power supply capacitor C3, while transistor q8 becomes ON and capacitor C11 is charged. And the closed-loop current gradually decreases, and the IV control integrated circuit IC2's vibration frequency decreases, and the output of the integration circuit 丨 | ^, that is, the resonance voltage of the capacitor C8 rises, and the discharge lamp "lights up. If The capacitor cu is charged, and the transistor Q8 becomes 0j? F '. As in the second embodiment, the discharge lamp LA continues to be normally turned on. When the discharge lamp is at the end of its life or defective, the discharge lamp is not turned on and the discharge lamp is turned on. For the end of the life, the operation of the non-emission lighting state in which the discharge lamp consumes excessive power is the same as in the first embodiment, and the case where the discharge lamp is replaced by the parent lamp in the lighting state is the same as in the second embodiment. As described above, the discharge lamp can be reliably lit. The fourth embodiment and FIG. 6 show the circuit of the discharge lamp lighting device of the fourth embodiment. This embodiment is provided with a MUler integrating circuit (MUler integrating circuiUMi, The mask circuit MC ° shown in FIG. 4 of the third embodiment instead of FIG. 6 is shown in FIG. 6+ with the same or equivalent parts as those in FIG. 5 shown in the second embodiment, and the description is omitted. Miller product (Iv) comprises a transistor electrically Q8 'collector electrode connected to the output portion of the integrating circuit IN and the emitter connected to the negative power supply E; transistor Q6'. Emitter connected to an electrical crystal heteroaryl

C: \ Program Fiies \ Patent \ 2148-2160-P.pt < i page 19 mm 415159 V. Description of the invention (18) Detection resistor for high-frequency current of discharge lamp, connected in series with the above-mentioned switching element and the above-mentioned abnormality detection terminal The resistor and the rectifying diode (rec tifi er di ode) and the smoothing capacitor connected between the abnormality detection terminal and the DC power supply; wherein the IV control integrated circuit is connected to the abnormality signal. When input to the abnormality detection terminal, the oscillation signal is stopped; the structure of the abnormality detection circuit for detecting the abnormality of the discharge lamp can be simple and the circuit loss is small. A phase advancing capaci tor flowing a high-frequency phase advance current is connected to the input side of the high-frequency power at both ends of the discharge lamp; therefore, a simple structure can be used to detect the abnormality of the discharge lamp. It also includes a mask circuit, which is connected to the output of the integrator circuit that does not emit the detection circuit, and is driven by the current output from the main oscillation resistance connection terminal that determines the oscillation frequency of the integrated circuit However, the above-mentioned non-emission detection circuit is not operated for a certain period of time necessary from the time when the DC power is turned on until the discharge lamp is turned on; therefore, the lighting can be surely put on. · Furthermore, the mask circuit includes: a timer, which is composed of a capacitor and a resistor that will output the input current at a certain time; 1 and a transistor, and the output from this timer The current comes to short the integration circuit for a certain time; therefore, the electric lamp can be turned on. Assuredly the put-fixed screen circuit includes: the timer is driven by the current output by the first timer composed of capacitors and resistors that will output the current being turned on in a short time; α and the second transistor day : From this: C: \ Program Files \ Patent \ 2148-2160-P.ptd ^ 22 K-415159 V. Description of the Invention (19) A transistor is used to drive and the integral circuit is short-circuited at a certain time; The discharge lamp can be reliably lit. [Brief description of the drawings] Fig. 1 is a circuit diagram showing a discharge lamp lighting device according to a first embodiment of the present invention. Fig. 2 is a graph showing a still-frequency voltage waveform 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 waveform diagram of a south frequency voltage of a discharge lamp lighting device according to a second embodiment of the present invention. Fig. 5 is a circuit diagram showing a discharge lamp lighting device according to a third embodiment of the present invention. Fig. 6 is a circuit diagram showing a discharge lamp lighting device according to a fourth embodiment of the present invention. Fig. 7 is a circuit diagram of a conventional discharge lamp lighting device. FIG. 8 is a high-frequency voltage wave chart of a conventional discharge lamp lighting device. [Description of symbols] 5 ~ abnormal detection terminal; 6 ~ main oscillation resistance connection terminal; C7 ~ phase lead capacitor; 9 ~ smoothing capacitor; Cll, C13 ~ capacitor; D5 ~ rectifier diode; DT ~ abnormal detection circuit; E ~ DC power supply; EA ~ error amplifier; EL ~ no emission detection circuit; IC2 ~ IV control integrated circuit; IN ~ integrating circuit; IV ~ inverting circuit; LA ~ discharge lamp; MC ~ curtain circuit; Q2, Q3 ~ MOSFET Q6, Q8 ~ transistor; R2 ~ main oscillation resistor; R6 ~ detection

C: \ ProgramFiles \ Patent \ 2148-2160-P.ptd page 23 415159 V. Description of the invention (20) Resistor; Rll, R12, R14 ~ resistor. imiw C: \ Program Files \ Patent \ 2148_2160-P.ptd page 24

Claims (1)

415159 VI. Scope of patent application 1. A discharge lamp lighting device, including:: Control integrated circuit '... often detect terminals, and turn out the vibrating disk output signal, inverter circuit to control the above-mentioned vibration of the integrated circuit The output signal is used to turn ON / OFF the switching element (swi tching eUment), and convert the voltage of the DC source into a high-frequency voltage. The discharge lamp is lit with high-frequency power from this inverter circuit. No emission detection circuit, detect no emission (emiss 丨 〇n _ 1 ess) lighting 'while rotating out the voltage controlling the oscillation frequency of the above-mentioned IV control integrated circuit, so that the high-frequency power consumed by the discharge lamp is equal to A reference voltage; and an abnormality detection circuit having a detection resistor for detecting a high-frequency current flowing to the discharge lamp, a resistor connected in series between the switching element and the abnormality detection terminal, a rectifier diode, and a connection A smoothing capacitor between the abnormality detection terminal and the DC power supply; wherein the IV control integrated circuit is based on the When the normal signal is input to the abnormality detection terminal, the oscillation signal is stopped. 2. The discharge lamp lighting device according to item 1 of the scope of the patent application, wherein a phase advance capacitor (phase advanc ing) is connected to the input side of the high frequency power at both ends of the discharge lamp and a phase advance current flowing through the high frequency capacitor). 3. The discharge lamp lighting device according to item 1 or 2 of the scope of patent application, which further includes a mask circuit 'connected to the non-emission detection is C: \ ProgramFiles \ Patent \ 2148-2160-P .ptd page 25 415159 VI. The output of the integration circuit of the patent-pending range measurement circuit and output by the main vibration remote resistance connection terminal that determines the Iv_ vibration surplus frequency; the circuit is turned on from the DC power supply to the discharge lamp. The one necessary for lighting causes the non-emission detection circuit to operate. Capturing β middle hood 4 act :::: The discharge lamp lighting device described in item 3 of the scope of interest, its timer (timer), the electric power output by a broken current in a certain time by the glare # k ^ ^ ™ Valley Is and resistors; and transistors (transistor), 丄 ,, Λ -h boat, and close to two two *) Wrong driven by the current output by this timer ': = circuit at a certain time Short (fine). The discharge lamp lighting device described in item 3 of the middle cover curtain, and its electrical structure: the first transistor that will output the input current at a fixed time, so you can see it *. 'I ft The current output from the timer is used to drive and the electric power of the younger brother, so the first Sk- branch circuit is short-circuited at a fixed time. 1 The crystal is driven to drive, and the product