JP4925286B2 - Discharge lamp lighting device and lighting fixture - Google Patents

Description

  The present invention relates to a discharge lamp lighting device and a lighting fixture.

  FIG. 12 is a circuit diagram showing a configuration of a discharge lamp lighting device according to the background art. In the discharge lamp lighting device shown in FIG. 12, a power supply unit (not shown) that generates the DC voltage Vdc, a series circuit including switching elements of the transistor Q1 and the transistor Q2 to which the DC voltage Vdc is applied, and the transistors Q1 and Q2 are alternately arranged. A control circuit unit 201 that generates a rectangular wave voltage at a connection point between the transistors Q1 and Q2 by being turned on and off is provided. The connection point between the transistors Q1 and Q2 is connected to one pole (1) of the filament F1 of the discharge lamp FL1 through a parallel circuit of a DC component cutting capacitor C1 and a resistor R5 and a resonance transformer T1. Has been.

  The control circuit unit 201 responds to the control signals from the comparators 202 and 203, the inverter control circuit 204 that outputs a control signal to alternately turn on and off the transistors Q1 and Q2 in a predetermined cycle, and the control signal from the inverter control circuit 204. And a drive circuit 205 for turning on and off the transistors Q1 and Q2. The inverter control circuit 204 turns on and off the transistors Q1 and Q2 when the output signal VNL of the comparator 202 is high and the output signal VEL of the comparator 203 is low, thereby supplying power to the discharge lamps FL1 and FL2. On the other hand, when the signal VNL is at a low level or the signal VEL is at a high level, the transistors Q1 and Q2 are turned off to stop the power supply to the discharge lamps FL1 and FL2.

  Further, the DC voltage Vdc is supplied to the other pole (2) of the filament F1 through the resistor R11. The DC voltage Vdc is supplied to the ground through a series circuit of a parallel circuit of a resistor R11, a resistor R3, and a resistor R4 and a capacitor C9, and a connection point between the resistor R3 and the resistor R4 is connected via a diode D3. Connected to the non-inverting input terminal of the comparator 203. Further, the connection point between the capacitor C1 and the resonance transformer T1 is connected to the ground via a series circuit of a parallel circuit of the resistor R1 and the resistor R2 and the capacitor C7, and the connection point between the resistor R1 and the resistor R2. Is connected to the non-inverting input terminal of the comparator 203 via the diode D1.

  The resistors R 1, R 2, R 3, R 4, R 5, R 11, capacitors C 7, C 9 and the comparator 203 constitute a DC detection circuit 206. The DC detection circuit 206 detects the DC component of the lamp voltage of the discharge lamps FL1 and FL2, so that the end of the lamp life and the poles (1) (2) at both ends of the filament F1 generated after the discharge lamps FL1 and FL2 are lit. ) And a failure state such as disconnection of the filament F1, and a circuit for turning off the discharge lamps FL1 and FL2 when the failure is detected.

  The filament F2 that forms a pair with the filament F1 in the discharge lamp FL1 and the filament F3 of the discharge lamp FL2 are connected in series at the connecting portion (7) to form a discharge lamp series circuit including the discharge lamps FL1 and FL2. The discharge lamp series circuit and the resonance capacitor C2 are connected in parallel.

  The detection voltage source 212 is connected to the ground via resistors R8, R9, and R10, a capacitor C8 is connected in parallel to the resistor R10, and the connection point between the resistors R9 and R10 is connected to the comparator 203 via the diode D2. Connected to non-inverting input terminal. A series circuit of a resistor R6 and a capacitor C4 is connected in parallel to the resistor R8. And the connection point of resistance R8, R9 and the capacitor | condenser C4 is connected with the pole (3) on the opposite side to the connection part (7) in the filament F2. Moreover, the pole (4) on the opposite side to the connection part (7) in the filament F3 is connected to the connection point of the resistors R9 and R10 via the resistor R7. The resistors R6, R7, R8, R9, and R10, the capacitor C8, the detection voltage source 212, and the comparator 203 constitute a filament defect detection circuit 207. The filament failure detection circuit 207 detects a failure state such as disconnection or contact failure of any of the pole (3), the pole (4), and the connection portion (7) generated after the discharge lamps FL1 and FL2 are turned on. It is a circuit for turning off the discharge lamps FL1, FL2 at the time of detection.

  The pole (1) of the filament F1 is connected to the pole (3) of the filament F2 via the resistor R12, and the pole (4) of the filament F3 is connected to the ground via the resistor R13 and the reversely connected zener diode ZD1. , A series circuit of a diode D4 and a resistor R14 is connected in parallel with the Zener diode ZD1, a capacitor C10 is connected in parallel with the resistor R14, and a connection point between the diode D4 and the capacitor C10 is a non-inverting input of the comparator 202 Connected to the terminal. The resistors R11, R12, R13, R14, the diode D4, the Zener diode ZD1, the capacitor C10, and the comparator 202 constitute a no-load detection circuit 208. The no-load detection circuit 208 detects a defective state such as connection failure of the poles (1), (2), (3), and (4) when the power is turned on and disconnection of the filaments F1, F2, and F3. This is a circuit for not lighting the FL1 and FL2.

  The DC voltage Vdc is connected to the ground through resistors R15, R16, and R17, and the connection point between the resistors R15 and R16 is connected to the pole (5) of the filament F4 that makes a pair with the filament F3 in the discharge lamp FL2. It is connected. The capacitor C11 is connected in parallel with the resistor R17, the connection point between the resistor R17 and the capacitor C11 is connected to the base of the transistor Q3, the emitter of the transistor Q3 is connected to the ground, and the collector of the transistor Q3 is connected via the resistor R18. And connected to a connection point between the resistor R13 and the diode D4. The no-load detection circuit 213 is configured by the resistors R15, R16, R17, R18, C11, and the transistor Q3. When the power is turned on, the no-load detection circuit 213 detects a defective state such as a connection failure between the pole (5) and the pole (6) opposite to the pole (5) in the filament F4 and a disconnection of the filament F4. This is a circuit for preventing the discharge lamps FL1, FL2 from being turned on at the time of detection.

  The transformer T1 includes secondary windings 209, 210, and 211. The one end a of the secondary winding 209 is connected to the pole (1) via the capacitor C3, and the other end b is connected to the pole (2). One end c of the secondary winding 210 is connected to the pole (3) via the capacitor C4, and the other end d is connected to the pole (4). One end e of the secondary winding 211 is connected to the pole (6) via the capacitor C5, and the other end f is connected to the pole (5). The pole (1) to the pole (6) and the connecting portion (7) are constituted by, for example, a connector, and the user can easily attach and detach the discharge lamps FL1 and FL2 from the discharge lamp lighting device.

  Next, operations of the DC detection circuit 206, the filament defect detection circuit 207, the no-load detection circuit 208, and the no-load detection circuit 213 configured as described above will be described.

  First, in a normal state, when power is supplied from the outside to a power supply unit (not shown), a DC voltage Vdc is generated. In the no-load detection circuit 213, a DC bias voltage from the DC voltage Vdc is passed through resistors R15 and R16. , Resistor R17, capacitor C11, and the base of transistor Q3. At the same time, a bias voltage is applied to the filament F4 through the path of R15, the pole (5), the filament F4, and the pole (6). However, the filament resistance value is approximately several Ω to several tens of Ω, and the resistors R15, R16, and R17 are configured with relatively large resistance values (approximately several tens of kΩ to several MΩ) that do not affect the resonant load circuit. Yes. Therefore, since the voltage generated between the poles (5) and (6) is very small, the voltage applied to the resistor R16 and the resistor R17 connected in parallel is very low, and almost no current is supplied to the base of the transistor Q3. No. Therefore, the transistor Q3 is off.

  In the no-load detection circuit 208, a DC bias voltage from the DC voltage Vdc is applied in parallel with the capacitor C10 and the resistor R14 via the resistor R11, the filament F1, the resistor R12, the filament F2, the filament F3, the resistor R13, and the diode D4. Applied to the circuit, the charging voltage Vc10 of the capacitor C10 increases. Accordingly, since the charging voltage Vc10 of the capacitor C10 input to the comparator 202 exceeds the reference voltage VrefN, the output signal VNL of the comparator 202 is output to the inverter control circuit 204 at a high level. Then, the inverter control circuit 204 starts the on / off operation of the transistors Q1 and Q2 (inverter oscillation operation), starts supplying power to the discharge lamps FL1 and FL2, and lights the discharge lamps FL1 and FL2.

  When power supply to the discharge lamps FL1 and FL2 is started, a high-frequency voltage is generated at both ends of the discharge lamps FL1 and FL2, and the high-frequency voltage is half-wave rectified in the Zener diode ZD1, and is peaked by the Zener diode ZD1. A voltage waveform is generated with the part clamped. This voltage waveform is filtered by the diode D4, the capacitor C10, and the resistor R14, and the charge voltage Vc10 is maintained at a level exceeding the reference voltage VrefN even after the on / off operation of the transistors Q1 and Q2 is started.

  Next, in the DC detection circuit 206, the DC voltage Vdc is divided by the resistors R11, R1, R2 and the resistors R11, R3, R4, and the capacitors C7, C9 are connected by the voltages at both ends of the resistors R2, R4. The discharge lamps FL1 and FL2 are connected in parallel with the series circuit of the resistors R1 and R2 and the series circuit of the resistors R3 and R4. Therefore, when the discharge lamps FL1 and FL2 are lit, the discharge lamps FL1 and FL2 As a result, the voltage is hardly generated in the parallel circuit of the capacitor C7 and the resistor R2 and the parallel circuit of the capacitor C9 and the resistor R4. Accordingly, the charging voltage Vc7 of the capacitor C7 and the charging voltage Vc9 of the capacitor C9 input to the comparator 203 via the diodes D1 and D3 do not exceed the reference voltage VrefE, so that the output signal VEL of the comparator 203 is low level and the inverter The power is output to the control circuit 204, and the power supply to the discharge lamps FL1 and FL2 is continued without being stopped.

  In the filament defect detection circuit 207, the detection voltage source 212 is divided by the parallel circuit of the resistors R6 and R7 and the resistors R8 and R9 and the resistor R10, and the capacitor C8 is connected by the voltage across the resistor R10. Although charged, the discharge lamp FL2 is connected in parallel with the series circuit of the resistors R9 and R10. Therefore, when the discharge lamps FL1 and FL2 are turned on, the impedance of the discharge lamp FL2 is reduced. As a result, the capacitor C8 and the resistor R10 In the parallel circuit, almost no voltage is generated. Accordingly, since the charging voltage Vc8 of the capacitor C8 input to the comparator 203 via the diode D2 does not exceed the reference voltage VrefE, the output signal VEL of the comparator 203 is output to the inverter control circuit 204 at a low level, and the discharge lamp FL1 , FL2 continues without being stopped.

  Next, when the connection of the poles (1), (2), (3), and (4) or the disconnection of the filaments F1, F2, and F3 occurs when the power is turned on (startup), the DC voltage Vdc is transferred to the capacitor C10. Since the capacitor C10 is not charged and the charging voltage Vc10 of the capacitor C10 input to the comparator 202 is lower than the reference voltage VrefN, the output signal VNL of the comparator 202 is low and the inverter control circuit It is output to 204. Then, the on / off operation of the transistors Q1 and Q2 by the inverter control circuit 204 is not started, and the discharge lamps FL1 and FL2 are not lit.

  In addition, when the connection between the poles (5) and (6) is poor or the filament F4 is disconnected when the power is turned on, the voltage generated between the poles (5) and (6) increases, and the pole (5) Since the voltage applied to the resistor R16 and the resistor R17 connected in parallel between (6) and the base current of the transistor Q3 also increases, the transistor Q3 is turned on. Then, since the resistor R18 is set to a resistance value that significantly reduces the voltage dividing ratio of the resistor R14 connected in parallel with the series circuit of the transistor Q3 and the resistor R18, the charging voltage Vc10 of the capacitor C10 is set to the reference voltage VrefN. Below. Then, the signal VNL is output at a low level from the comparator 202, the on / off operation of the transistors Q1, Q2 by the inverter control circuit 204 is not started, and the discharge lamps FL1, FL2 are not lit.

  Next, in the state where the discharge lamps FL1 and FL2 are lit, when the disconnection or poor contact of the poles (1), (2), (3), (4) and the connection portion (7) occurs, The voltage across the resistors R2 and R4 or the resistor R10 of the filament defect detection circuit 207 is increased, and charging of the highest voltage value among the charging voltage Vc7 of the capacitor C7, the charging voltage Vc8 of the capacitor C8, and the charging voltage Vc9 of the capacitor C9 is performed. The voltage Vcn is input to the comparator 203. When the charging voltage Vcn exceeds the reference voltage VrefE, the signal VEL is output at a high level from the comparator 203, the on / off operation of the transistors Q1 and Q2 by the inverter control circuit 204 is stopped, and the discharge lamps FL1 and FL2 are discharged. Is cut off, and the discharge lamps FL1, FL2 are turned off.

  When the output VNL of the comparator 202 becomes a low level as described above, the inverter control circuit 204 stops the on / off operation of the transistors Q1 and Q2 (standby mode), and remounts and replaces the discharge lamps FL1 and FL2. When the connection failure of the poles (1), (2), (3), (4), (5), and (6) and the disconnection of the filaments F1, F2, F3, and F4 are eliminated, the output VNL of the comparator 202 becomes high. Therefore, the transistors Q1 and Q2 are turned on and off, and the discharge lamps FL1 and FL2 are turned on.

  On the other hand, when the output VEL of the comparator 203 is at a high level, the inverter control circuit 204 stops the on / off operation of the transistors Q1 and Q2 for a predetermined period and then starts it again. Then, when the oscillation stop by the output VEL of the comparator 203 occurs continuously a predetermined number of times, the subsequent oscillation is stopped (latch mode). Then, the oscillation stop state is continued until a predetermined reset operation such as turning on the power supply or reattaching the discharge lamps FL1 and FL2 is performed, and when the reset operation is performed, the on / off operation of the transistors Q1 and Q2 is started. Then, the discharge lamps FL1 and FL2 are turned on.

As described above, in the discharge lamp lighting device, defects in the poles (1), (2), (3), (4), (5), and (6), the connecting portion (7), and the filaments F1, F2, F3, and F4 are detected. Then, the discharge lamps FL1 and FL2 are configured not to be turned on or turned off (see, for example, Patent Document 1).
JP 2005-222893 A

  By the way, in the above-described conventional discharge lamp lighting device, when the lamp voltage decreases due to an abnormal load (for example, a single lamp discharge state) or a change in ambient temperature, the capacitor C10 of the no-load detection circuit 208 becomes insufficiently charged, Although the discharge lamps FL1 and FL2 are normally connected, the charging voltage Vc10 decreases, and a low level signal VNL is output from the comparator 202, and the on / off operation of the transistors Q1 and Q2 is stopped. Unexpected behavior may occur due to malfunction.

  The fluctuation of the lamp voltage due to the abnormal load and the change in lamp peripheral temperature will be described with reference to FIGS. FIG. 13A shows the lamp voltages VL1 and VL2 when the normal discharge lamps FL1 and FL2 are connected, and both lamp voltages have normal amplitude.

  On the other hand, when the filament F1 of the discharge lamp FL1 is in the Emiless state, as shown in FIG. 13B, a negative DC component DCn is generated in the lamp voltage VL1 of the abnormal discharge lamp FL1, which is normal. The lamp voltage VL2 of the discharge lamp FL2 has a small amplitude. In addition, when the filament F2 of the discharge lamp FL1 is in an Emileless state, as shown in FIG. 13C, a positive DC component DCp is generated in the lamp voltage VL1 of the abnormal discharge lamp FL1, and normal discharge is performed. The lamp voltage VL2 of the electric lamp FL2 has a small amplitude. Further, when the filament F3 of the discharge lamp FL2 is in the Emires state, as shown in FIG. 13D, a normal amplitude is generated in the lamp voltage VL1 of the normal discharge lamp FL1, and the abnormal discharge lamp FL2 A negative DC component DCn is generated in the lamp voltage VL2. Further, when both filaments F1 and F2 of the discharge lamp FL1 are in the Emires state, as shown in FIG. 13 (e), the lamp voltage VL1 of the abnormal discharge lamp FL1 increases in amplitude, and the normal discharge lamp FL2 The ramp voltage VL2 has a small amplitude.

  Further, when the lamp voltage decreases due to a change in ambient temperature, the amplitudes of the lamp voltages VL1 and VL2 of the discharge lamps FL1 and FL2 become small as shown in FIG. 13 (f).

  In the case of FIGS. 13B to 13E, the capacitor C10 of the no-load detection circuit 208 becomes insufficiently charged. In the case of FIG. The capacitor C10 becomes insufficiently charged, and the low-level signal VNL is output from the comparator 202 even though the discharge lamps FL1 and FL2 are connected, and the on / off operation of the transistors Q1 and Q2 is stopped. However, since all the filaments F1, F2, F3, and F4 and the poles (1), (2), (3), and (4) are connected, from the DC voltage Vdc, the resistor R11, the filament F1, the resistors R12, R13, and The DC bias path for supplying the charging current to the capacitor C10 through the diode D4 is conductive and can be started again. Then, after the restart, after passing through the preheating mode, when shifting to the start mode in which the resonance voltage applied to the series circuit of the discharge lamps FL1, FL2 rises, the resistor R13, the diode is caused by the high-frequency voltage generated at both ends of the discharge lamps FL1, FL2. Although the capacitor C10 is charged via D4, the lamp voltage is low due to the abnormal load or the change in the ambient temperature, the capacitor C10 becomes insufficiently charged again, and the oscillation is stopped. If such intermittent oscillation is repeated, abnormal heat generation, failure, or fire may occur due to increased stress of the components in the discharge lamp lighting device 5, which may lead to abnormal heat generation in, for example, a lamp or a socket. Also, if the cause is a change in ambient temperature, the product specification of “continue normal lighting when a normal load is connected” will not be satisfied, and the filament temperature will rise excessively due to repeated preheating modes, resulting in a short lamp life There is a concern about conversion.

  That is, when the discharge voltage FLc1 is decreased, the no-load detection circuit is used when the charging voltage Vc10 of the capacitor C10 is decreased due to a decrease in the lamp voltage due to the state of the discharge lamps FL1 and FL2 or the change in ambient temperature. 208 indicates that the discharge lamps FL1 and FL2 are normally attached, but the connection between the poles (1), (2), (3), and (4) is defective, and the filaments F1, F2, and F3 are disconnected. There is a problem that the discharge lamps FL1 and FL2 are extinguished by erroneously detecting that the above has occurred.

  When the filament F4 of the discharge lamp FL2 is in the Emiless state, as shown in FIG. 13 (g), a positive DC component DCp is generated in the lamp voltage VL1 of the normal discharge lamp FL1, and abnormal discharge occurs. A positive DC component DCp is also generated in the lamp voltage VL2 of the lamp FL2. Further, when both filaments F3 and F4 of the discharge lamp FL2 are in the Emires state, as shown in FIG. 13 (h), the lamp voltage VL1 of the abnormal discharge lamp FL1 increases in amplitude, and the normal discharge lamp FL2 The amplitude of the lamp voltage VL2 also increases. 13 (g) and 13 (h), the capacitor C10 of the no-load detection circuit 208 is sufficiently charged, so that the on / off operations of the transistors Q1 and Q2 are continued.

  The present invention has been made in view of the above-described reasons, and its purpose is to prevent erroneous detection by the no-load detection circuit during lighting of the discharge lamp even when the lamp voltage is lowered due to the state of the discharge lamp. It is providing a discharge lamp lighting device and a lighting fixture.

The invention of claim 1 comprises a plurality of discharge lamps having lighting filaments at both ends, which are configured as a series circuit of discharge lamps by connecting the filaments in series, and a receiving unit for receiving power supply from the outside, and a receiving unit A power supply unit that emits a plurality of discharge lamps by supplying a lighting voltage to a series circuit of the discharge lamps based on the power received by the lamp, and an abnormality detection unit that detects defects in the filament units connected in series The abnormality detection unit is configured to detect a defect in the filament unit connected in series when reception of external power supply is started by the reception unit. Filament defect detection for detecting defects in the filament parts connected in series when the lighting voltage is supplied by the load detection unit and the power supply unit The no-load detection unit includes a first resistor for applying a lighting voltage to a high potential side pole in the filament series circuit, and a current derived from the low potential side pole in the filament series circuit. The first capacitor to be charged by the power supply unit and when the charging voltage of the first capacitor exceeds a preset first reference voltage, the power supply unit supplies power to the series circuit of the discharge lamp, When the charging voltage of the first capacitor is equal to or lower than the first reference voltage, a first control unit that stops power supply by the power supply unit and a charging voltage for compensating for insufficient charging of the first capacitor are output. An oscillation voltage supply source, and the filament defect detection unit outputs a detection voltage source for detecting a defect in the filament unit, and second, third, and second voltage dividing detection voltages. A second circuit connected in parallel with the fourth resistor, and a fifth resistor connecting the connection point between the third and fourth resistors and the pole on the low potential side. A connection point between the second and third resistors and the high-potential side pole are connected, and a voltage generated at the connection point between the third and fourth resistors is a preset second value. The second control unit that stops the power supply by the power supply unit when the reference voltage is exceeded, and after the power supply by the power supply unit is started, in conjunction with the start of the power supply, The oscillation voltage supply source starts to output a charging voltage, and the detection voltage source starts to output a detection voltage.

  According to this invention, in the discharge lamp lighting device, the oscillation voltage supply source outputs the charging voltage for compensating for the insufficient charging of the first capacitor after the power supply by the power supply unit is started. Even when the lamp voltage drops due to the state of the electric lamp, it is possible to prevent erroneous detection by the no-load detection circuit while the discharge lamp is lit. For example, even when the discharge lamp is turned on, even if the lamp voltage drops due to an abnormal load such as an Emileless state or the lamp voltage drops due to a change in the ambient temperature, it will not turn off due to erroneous detection of the no-load detection unit. So, for example, without repeating intermittent oscillation, avoid abnormal heat generation, failure, or fire due to increased stress of components in the discharge lamp lighting device when abnormal load is connected, and abnormal heat generation of lamps, sockets, etc. Yes, when the ambient temperature changes, satisfy the product specification of “continue normal lighting when a normal load is connected” to avoid excessive rise in filament temperature and shortening of lamp life due to repeated preheating modes. it can.

  According to a second aspect of the present invention, in the first aspect, the power supply unit includes a DC voltage source that outputs a DC voltage, a first switching element to which a DC voltage output from the DC voltage source is applied, and a second A rectangular circuit voltage output from a connection point between the first and second switching elements by alternately turning on and off the first and second switching elements. It is supplied as a lighting voltage to a series circuit, and the oscillation voltage supply source and the detection voltage source output the rectangular wave voltage as a charging voltage and a detection voltage. To do.

  According to the present invention, it is possible to configure an oscillation voltage supply source that outputs a charging voltage after power supply by the power supply unit is started.

  According to a third aspect of the present invention, in the first aspect, the power supply unit includes a DC voltage source that outputs a DC voltage, a first switching element to which a DC voltage output from the DC voltage source is applied, and a second A rectangular circuit voltage output from a connection point between the first and second switching elements by alternately turning on and off the first and second switching elements. Supplying as a lighting voltage to the series circuit, the series circuit includes a third capacitor, a first transformer, and a third switching element connected in parallel with the second switching element, The first secondary winding of one transformer is connected to the high-potential side pole and the low-potential side pole via a fourth capacitor, and before the light emission of the discharge lamp starts, the third switching element is connected. on A preheating control unit for outputting a preheating current from the first secondary winding of the first transformer to the series circuit of the filaments and turning off the third switching element after starting the light emission of the discharge lamp. It is characterized by having.

  According to this invention, the discharge lamp is preheated to improve the starting characteristics, and at the time of lighting, the output of the preheat current can be stopped to save power.

  According to a fourth aspect of the present invention, in the third aspect, the oscillation voltage supply source and the detection voltage source use the voltage between the third capacitor and the first transformer as a charging voltage and a detection voltage. It is what outputs.

  According to the present invention, it is possible to configure an oscillation voltage supply source that outputs a charging voltage after power supply by the power supply unit is started.

  According to a fifth aspect of the present invention, in the first aspect, the power supply unit includes a DC voltage source that outputs a DC voltage between the positive terminal and the negative terminal, and a first switching element connected between the positive terminal and the negative terminal. And a series circuit composed of second switching elements, and by alternately turning on and off the first and second switching elements, a rectangular wave voltage output from a connection point between the first and second switching elements is obtained. , And supplied as a lighting voltage to the series circuit of the discharge lamp through the fifth capacitor and the second transformer, and the first secondary winding of the second transformer has the sixth capacitor The oscillation voltage supply source and the detection voltage source are connected to the high potential side pole and the low potential side pole via the second secondary winding of the second transformer, Charging voltage and detection voltage And characterized in that outputs Te.

  According to the present invention, it is possible to configure an oscillation voltage supply source that outputs a charging voltage after power supply by the power supply unit is started.

  A sixth aspect of the present invention is characterized in that, in the first aspect, the oscillation voltage supply source shunts a control power supply of the apparatus to generate a charging voltage.

  According to the present invention, the configuration can be simplified by generating the control power source and the oscillation voltage supply source from the same power source.

  A seventh aspect of the present invention is that, in the sixth aspect, the power supply unit includes a DC voltage source that outputs a DC voltage, a first switching element to which a DC voltage output from the DC voltage source is applied, and a second A rectangular circuit voltage output from a connection point between the first and second switching elements by alternately turning on and off the first and second switching elements. Supplying as a lighting voltage to a series circuit, and comprising a series circuit composed of a third capacitor and a first transformer connected in parallel with the second switching element, the secondary of the first transformer The control power supply of this apparatus is produced | generated by the output of a coil | winding.

  According to the present invention, a control power supply that can also be used as a voltage supply source during oscillation can be configured.

  The invention according to claim 8 is the power supply unit according to claim 6, wherein the power supply unit outputs a DC voltage between a positive terminal and a negative terminal, and a first switching element connected between the positive terminal and the negative terminal And a series circuit composed of second switching elements, and by alternately turning on and off the first and second switching elements, a rectangular wave voltage output from a connection point between the first and second switching elements is obtained. , Supplied as a lighting voltage to the series circuit of the discharge lamp through a fifth capacitor and a second transformer, and generates a control power supply for the apparatus by the output of the secondary winding of the second transformer It is characterized by doing.

  According to the present invention, a control power supply that can also be used as a voltage supply source during oscillation can be configured.

  A ninth aspect of the present invention provides the power supply unit according to the sixth aspect, wherein the power supply unit includes a DC voltage source that outputs a DC voltage, a first switching element to which a DC voltage output from the DC voltage source is applied, and a second switching element. A rectangular circuit voltage output from a connection point between the first and second switching elements by alternately turning on and off the first and second switching elements. The voltage is supplied as a lighting voltage to the series circuit, and a control power supply for the apparatus is generated by a charging current of a seventh capacitor provided between both ends of the second switching element.

  According to the present invention, a control power supply that can also be used as a voltage supply source during oscillation can be configured.

  A tenth aspect of the present invention is that, in the sixth aspect, the power supply unit includes: a direct current voltage source that outputs a direct current voltage; a first switching element to which a direct current voltage output from the direct current voltage source is applied; A rectangular circuit voltage output from a connection point between the first and second switching elements by alternately turning on and off the first and second switching elements. A secondary winding of the first transformer of the series circuit, which is supplied as a lighting voltage to the series circuit and is connected in parallel with the second switching element and which includes a third capacitor and a first transformer. , The output of the secondary winding of the second transformer provided in the rectangular wave voltage supply path, and the charging current of the seventh capacitor provided between both ends of the second switching element, Characterized in that it also generates a control power of the device by two.

  According to the present invention, a control power supply that can also be used as a voltage supply source during oscillation can be configured.

  The invention of claim 11 is the invention according to any one of claims 1 to 10, wherein the second controller of the filament defect detection unit receives a power supply from the reception unit and is within a preset period. The power supply is not stopped even when the voltage generated at the connection point between the third and fourth resistors exceeds the second reference voltage.

  According to the present invention, it is possible to avoid an unlit state due to a transient characteristic when the power is turned on.

  According to a twelfth aspect of the present invention, in any one of the first to eleventh aspects, the first control unit of the no-load detection unit may perform the series connection when a charging voltage of the first capacitor is lower than a first reference voltage. The supply of power is stopped until the defect of the filament connected to the terminal is resolved, and the second controller of the filament defect detector detects the voltage generated at the connection point between the third and fourth resistors. When the second reference voltage is exceeded, after the power supply by the power supply unit is stopped for a predetermined period, the power supply by the power supply unit is started again, and when the power supply stop occurs for a predetermined number of times, The power supply by the power supply unit is stopped until a predetermined reset operation is performed.

  According to the present invention, when no load is detected, the power supply is stopped until the discharge lamp is normally mounted, and when a filament defect is detected, the power supply is restarted a predetermined number of times, so that both safety and convenience are achieved. Yes.

  Invention of Claim 13 is a lighting fixture provided with the discharge lamp and the discharge lamp lighting device which lights a discharge lamp, The said discharge lamp lighting device is the discharge lamp lighting device in any one of Claims 1-12. It is characterized by that.

  According to this invention, in the lighting fixture, even when the lamp voltage is lowered due to the state of the discharge lamp, it is possible to prevent erroneous detection by the no-load detection circuit while the discharge lamp is turned on.

  As described above, the present invention has an effect that it is possible to prevent erroneous detection by the no-load detection circuit during lighting of the discharge lamp even when the lamp voltage is lowered due to the state of the discharge lamp.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 2 is a perspective view showing an example of the appearance of the lighting fixture according to the first embodiment of the present invention. The luminaire 1 shown in FIG. 2 includes a luminaire main body 2 and connectors 4 a, 4 b, 4 c, and 4 d that are erected on the luminaire main body 2 and attach the discharge lamps FL 1 and FL 2 to the luminaire 1. A discharge lamp lighting device 5 is stored inside the luminaire body 2.

  FIG. 1 is a circuit diagram showing an example of a configuration of a discharge lamp lighting device 5 mounted on the lighting fixture 1 shown in FIG. A discharge lamp lighting device 5 shown in FIG. 1 generates a DC voltage Vdc from a power supply connector 101 that receives an input of a commercial power supply Vac, and a commercial power supply Vac supplied via the power supply connector 101, and passes through a DC power supply line L. Switching of the power source 102 supplied to each part of the discharge lamp lighting device 5, and the transistor Q1 (first switching element) and the transistor Q2 (second switching element) interposed between the DC power line L and the ground By alternately turning on and off the series circuit of the elements and the transistors Q1 and Q2, a high-frequency rectangular wave voltage is generated at the connection point of the transistors Q1 and Q2 to function as an inverter, and light is emitted to the discharge lamps FL1 and FL2. The control circuit 103 for supplying power and the discharge lamp by the on / off operation of the transistors Q1 and Q2 After power supply for causing L1 and FL2 to emit light is started, a detection voltage source 115 that starts output of the DC voltage E1 and an oscillation voltage supply source 118 that starts output of the DC voltage E2 are provided. .

  The connection point between the transistors Q1 and Q2 is connected to one pole (1) of the filament F1 of the discharge lamp FL1 through a parallel circuit of a DC component cutting capacitor C1 and a resistor R5 and a resonance transformer T1. ing. The discharge lamps FL1 and FL2 are connected in series to form a discharge lamp series circuit, and the discharge lamp series circuit and the resonance capacitor C2 are connected in parallel. Furthermore, a resonant load circuit is configured by the transformer T1, the capacitor C2, and the discharge lamps FL1 and FL2.

  The control circuit unit 103 responds to the control signal from the inverter control circuit 106 and the inverter control circuit 106 that outputs a control signal to alternately turn on and off the comparators 104 and 105, and the transistors Q1 and Q2 in a predetermined cycle. And a drive circuit 107 for turning on and off the transistors Q1 and Q2. The inverter control circuit 106 is configured by using, for example, a CPU (Central Processing Unit) and a timer circuit, and is a control unit for controlling the frequency for turning on and off the transistors Q1 and Q2 to operate as an inverter. When the output signal VNL of 104 is at a high level and the output signal VEL of the comparator 105 is at a low level, the transistors Q1 and Q2 are alternately turned on and off to start the oscillating operation of the inverter to the discharge lamps FL1 and FL2. While supplying power, when the signal VNL is at a low level or the signal VEL is at a high level, the transistors Q1 and Q2 are turned off to stop supplying power to the discharge lamps FL1 and FL2. Let Further, the inverter control circuit 106 has a mask function that does not stop the power supply to the discharge lamps FL1 and FL2 even when the output signal VEL of the comparator 105 becomes high level for a certain period after the power is turned on. This certain period is called a mask period.

  The filament F2 that forms a pair with the filament F1 in the discharge lamp FL1 and the filament F3 of the discharge lamp FL2 are connected in series at the connecting portion (7) to form a discharge lamp series circuit including the discharge lamps FL1 and FL2. The discharge lamp series circuit and the resonance capacitor C2 are connected in parallel. That is, the filaments F2 and F3, the connecting portion (7), the high potential side pole (3) of the filament F2, and the low potential side pole (4) of the filament F3 are in the “filament portion connected in series”. Equivalent to.

  A connection point between the capacitor C1 and the resonance transformer T1 is connected to the ground via resistors R1 and R2, and a capacitor C7 is connected in parallel with the resistor R2. Further, the connection point between the capacitor C7 and the resistor R1 is connected to the non-inverting input terminal of the comparator 105 via the diode D1. The resistors R1 and R2, the capacitor C7, and the comparator 105 constitute a DC detection circuit 114 that detects a DC component of the load.

  The other pole (2) of the filament F1 is connected to the DC power supply line L via the resistor R11. The pole (2) is connected to the ground through a series circuit of a resistor R3 and a parallel circuit of a resistor R4 and a capacitor C9, and the connection point of the resistor R3 and the resistor R4 is connected to the non-contact of the comparator 105 via the diode D3. It is connected to the inverting input terminal. The resistors R3, R4, R11, the capacitor C7, and the comparator 105 constitute a DC detection circuit 116 that detects a DC component of the load. The DC detection circuits 114 and 116 detect the DC component of the lamp voltage of the discharge lamps FL1 and FL2, thereby detecting the end-of-life state of the lamp and the poles (1) at both ends of the filament F1 generated after the discharge lamps FL1 and FL2 are turned on. This is a circuit for detecting a defective state such as the connection failure in (2) and disconnection of the filament F1, and turning off the discharge lamps FL1 and FL2 when the failure is detected.

  The detection voltage source 115 is connected to the ground via resistors R8 (second resistor), R9 (third resistor), and R10 (fourth resistor), and is connected to the capacitor C8 (first resistor) in parallel with the resistor R10. 2 capacitor), and the connection point of the resistors R9 and R10 is connected to the non-inverting input terminal of the comparator 105 via the diode D2. A series circuit of a resistor R6 and a capacitor C4 is connected in parallel to the resistor R8. And the connection point of resistance R8, R9 and the capacitor | condenser C4 is connected with the pole (3) on the opposite side to the connection part (7) in the filament F2. Moreover, the pole (4) on the opposite side to the connection part (7) in the filament F3 is connected to the connection point of the resistors R9 and R10 via the resistor R7 (fifth resistor). A filament defect detection circuit 108 is configured by the detection voltage source 115, the resistors R6, R7, R8, R9, R10, the capacitor C8, and the comparator 105. The filament failure detection circuit 108 detects a failure state such as disconnection or contact failure of any of the pole (3), the pole (4), and the connection portion (7) generated after the discharge lamps FL1 and FL2 are turned on. It is a circuit for turning off the discharge lamps FL1, FL2 at the time of detection.

  Further, the pole (1) of the filament F1 is connected to the pole (3) of the filament F2 via the resistor R12 (first resistor), and the pole (4) of the filament F3 is connected to the resistor R13 and the reversely connected zener. Connected to the ground via the diode ZD1, a series circuit of a diode D4 and a resistor R14 is connected in parallel with the Zener diode ZD1, a capacitor C10 (first capacitor) is connected in parallel to the resistor R14, and the diode D4 and the capacitor The connection point with C10 is connected to the non-inverting input terminal of the comparator 104. Further, the output E2 of the oscillation voltage supply source 118 is connected to a connection point of the diode D4, the capacitor C10, and the comparator 104 via the diode D5. The resistors R11, R12, R13, R14, the diode D4, the Zener diode ZD1, the capacitor C10, and the comparator 104 constitute a no-load detection circuit 109. The no-load detection circuit 109 detects a defective state such as the connection failure of the poles (1), (2), (3), and (4) when the power is turned on and the disconnection of the filaments F1, F2, and F3. This is a circuit for not lighting the FL1 and FL2.

  The DC power supply line L is connected to the ground via resistors R15, R16, and R17, and the connection point of the resistors R15 and R16 is connected to the pole (5) of the filament F4 that forms a pair with the filament F3 in the discharge lamp FL2. Has been. The capacitor C11 is connected in parallel with the resistor R17, the connection point between the resistor R17 and the capacitor C11 is connected to the base of the transistor Q3, the emitter of the transistor Q3 is connected to the ground, and the collector of the transistor Q3 is connected via the resistor R18. It is connected to a connection point between the resistor R13 and the anode of the diode D4. The no-load detection circuit 113 is configured by the resistors R15, R16, R17, R18, C11, and the transistor Q3. When the power is turned on, the no-load detection circuit 113 detects a defective state such as a connection failure between the pole (5) and the pole (6) on the opposite side of the pole (5) in the filament F4 and a disconnection of the filament F4. This is a circuit for preventing the discharge lamps FL1, FL2 from being turned on at the time of detection.

  Then, when the output VNL of the comparator 104 becomes a low level, the inverter control circuit 106 stops the on / off operation of the transistors Q1 and Q2 (standby mode), and reconnects or replaces the discharge lamps FL1 and FL2, etc. When the connection failure of (1), (2), (3), (4), (5), and (6) and the disconnection of the filaments F1, F2, F3, and F4 are resolved, the output VNL of the comparator 104 becomes high level. Then, the transistors Q1 and Q2 are turned on and off, and the discharge lamps FL1 and FL2 are turned on.

  On the other hand, when the output VEL of the comparator 105 is at a high level, the inverter control circuit 106 stops the on / off operation of the transistors Q1 and Q2 for a predetermined period and then starts again. When the oscillation stop by the output VEL of the comparator 105 occurs continuously a predetermined number of times, the subsequent oscillation is stopped (latch mode). Then, the oscillation stop state is continued until a predetermined reset operation such as turning on the power supply or reattaching the discharge lamps FL1 and FL2 is performed, and when the reset operation is performed, the on / off operation of the transistors Q1 and Q2 is started. Then, the discharge lamps FL1 and FL2 are turned on.

  Since the inverter control circuit 106 performs oscillation stop control as described above, when the abnormal load is connected, the filament is disconnected, or the connection failure of the pole occurs, the transistors Q1 and Q2 are continuously stopped from oscillating. It is possible to avoid stress on the components of the device 5 and abnormal heat generation of the load, and furthermore, the oscillation operation can be resumed by replacing or reattaching the discharge lamps FL1 and FL2, or by a predetermined reset operation.

  Next, the transformer T1 includes secondary windings 110, 111, and 112. One end a of the secondary winding 110 is connected to the pole (1) via the capacitor C3, and the other end b is connected to the pole (2). One end c of the secondary winding 111 is connected to the pole (3) via the capacitor C4, and the other end d is connected to the pole (4). One end e of the secondary winding 112 is connected to the pole (6) via the capacitor C5, and the other end f is connected to the pole (5).

  Then, for example, by connecting the discharge lamp lighting device 5 and the discharge lamp FL1 via the connector 4a (see FIG. 2), the pole (1) and the pole (2) are configured. For example, the discharge lamp lighting device is connected via the connector 4b. 5 is connected to the discharge lamp FL1, and the pole (4) is formed by connecting the discharge lamp lighting device 5 and the discharge lamp FL2 via, for example, the connector 4c. By connecting the discharge lamp lighting device 5 and the discharge lamp FL2, the pole (5) and the pole (6) are configured, and the connecting portion (7) is configured by connecting the connector 4b and the connector 4c. By using the connectors 4a, 4b, 4c, and 4d, the user can easily detach the discharge lamps FL1 and FL2 from the discharge lamp lighting device.

  Next, the lighting operation of the discharge lamp lighting device 5 configured as described above will be described. 3 and 4 are diagrams for explaining the operation of the discharge lamp lighting device 5. First, the operation of the discharge lamps FL1 and FL2 when the filament state and the connection of the pole (1) to the pole (6), the connection portion (7), etc. are normal will be described. First, when power is turned on by the user, the commercial power supply Vac is received by the power connector 101, and the DC voltage Vdc is supplied to each part of the discharge lamp lighting device 5 by the power supply unit 102 via the DC power supply line L.

  When the DC voltage Vdc is supplied, the inverter control circuit 106 turns on and off the transistors Q1 and Q2 alternately at a frequency fph higher than the no-load resonance frequency fo determined by the inductance of the transformer T1 and the capacitance of the capacitor C2. Thus, the oscillation operation of the inverter is started. As a result, a low resonance voltage that does not start lighting is applied to the series circuit of the discharge lamps FL1 and FL2. At this time, the pre-heating current for heating the filaments F1, F2, F3, and F4 flows from the secondary windings 110, 111, and 112 of the transformer T1 through the capacitors C3, C4, and C5, respectively (preceding preheating mode). .

  The inverter control circuit 106 changes the operating frequency of the inverter from the frequency fph to the frequency fst so that the discharge lamps FL1 and FL2 are turned on after a preset preheating time has elapsed. The applied resonance voltage rises and the discharge lamps FL1 and FL2 are turned on (starting mode).

  Thereafter, the on / off frequency of the inverter by the inverter control circuit 106 is changed to a frequency ft of a lower frequency and shifts to the normal lighting state, and the discharge lamps FL1 and FL2 are caused to emit light stably (normal lighting mode). The discharge lamps FL1 and FL2 are turned on by the above sequence operation.

  By the way, if the filaments of the discharge lamps FL1 and FL2 are disconnected, or the connection of the pole (1) to the pole (6), the connection portion (7) is disconnected or is poorly connected, the discharge lamp is assumed to be as it is. When FL1 and FL2 are turned on, the non-resonant resonance characteristics shown in FIG. 4 are approached, so that the voltage applied to the discharge lamps FL1 and FL2 rises, and the voltage stress in each circuit section in the discharge lamp lighting device 5 is increased. There is an inconvenience that an increase in arc or an arc occurs in a defective part.

  Therefore, the discharge lamp lighting device 5 shown in FIG. 2 includes the filament defect detection circuit 108, the no-load detection circuit 109, the no-load detection circuit 113, the DC detection circuit 114, and the DC detection circuit 116, so that the discharge lamps FL1 and FL2 are provided. The voltage stress is reduced by detecting the disconnection of the filament and the connection failure of the pole (1) to the pole (6), the connection portion (7), etc., and preventing the discharge lamps FL1 and FL2 from being turned on at the time of failure. I am doing so.

  Next, operations of the filament defect detection circuit 108, the no-load detection circuit 109, the no-load detection circuit 113, the DC detection circuit 114, and the DC detection circuit 116 will be described. First, the operation of the discharge lamps FL1 and FL2 when the filament state and the connection of the pole (1) to the pole (6), the connection portion (7), etc. are normal will be described.

  First, when power is turned on by the user, the commercial power supply Vac is received by the power connector 101, and the DC voltage Vdc is supplied to each part of the discharge lamp lighting device 5 by the power supply unit 102 via the DC power supply line L.

  When the DC voltage Vdc is supplied, the inverter control circuit 106 applies a DC bias voltage from the DC voltage Vdc to the base of the resistor R17, the capacitor C11, and the transistor Q3 via R15 and R16 in the no-load detection circuit 113. Is done. At the same time, a bias voltage is applied to the filament F4 through the path of R15, the pole (5), the filament F4, and the pole (6). However, the filament resistance value is approximately several Ω to several tens of Ω, and the resistors R15, R16, and R17 are configured with relatively large resistance values (approximately several tens of kΩ to several MΩ) that do not affect the resonant load circuit. Yes. Therefore, since the voltage generated between the poles (5) and (6) is very small, the voltage applied to the resistor R16 and the resistor R17 connected in parallel is very low, and almost no current is supplied to the base of the transistor Q3. No. Therefore, the transistor Q3 is off.

  In the no-load detection circuit 109, a DC bias voltage from the DC voltage Vdc is a parallel circuit of a capacitor C10 and a resistor R14 via a resistor R11, a filament F1, a resistor R12, a filament F2, a filament F3, a resistor R13, and a diode D4. And the charging voltage Vc10 of the capacitor C10 rises. Therefore, since the charging voltage Vc10 of the capacitor C10 input to the comparator 104 exceeds the reference voltage VrefN (first reference voltage), the output signal VNL of the comparator 104 is output to the inverter control circuit 106 at a high level. Then, on / off operation of the transistors Q1 and Q2 is started by the inverter control circuit 106, power supply to the discharge lamps FL1 and FL2 is started, and the discharge lamps FL1 and FL2 are turned on.

  When power supply to the discharge lamps FL1 and FL2 is started, the high-frequency voltage generated at both ends of the discharge lamps FL1 and FL2 is supplied from the pole (4) to the Zener diode ZD1 via the resistor R13. In ZD1, the high-frequency voltage is half-wave rectified, and a voltage waveform in which the peak portion is clamped by the Zener diode ZD1 is generated. This voltage waveform is filtered by the diode D4, the capacitor C10, and the resistor R14, and the charge voltage Vc10 is maintained at a level exceeding the reference voltage VrefN even after the on / off operation of the transistors Q1 and Q2 is started.

  When power supply to the discharge lamps FL1, FL2 is started, the oscillation voltage supply source 118 also starts to output the DC voltage E2, and supplies a charging current to the capacitor C10 via the diode D5. Therefore, when the discharge lamps FL1 and FL2 are turned on, a decrease in the lamp voltage due to an abnormal load (for example, a single emission state of the discharge lamp) or a decrease in the lamp voltage due to a change in the ambient temperature (particularly a positive voltage decrease) occurs. Even so, since a sufficient charging current is supplied to the capacitor C10 from the oscillation voltage supply source 118, the voltage of the charging voltage Vc10 is maintained at a level exceeding the reference voltage VrefN. That is, although the discharge lamps FL1 and FL2 are normally connected, the charging voltage Vc10 decreases, the high level signal VNL is output from the comparator 202, and the on / off operation of the transistors Q1 and Q2 is stopped. An unexpected operation due to a malfunction does not occur, the intermittent oscillation described in the background art is not repeated, and the stress in the components in the discharge lamp lighting device 5 increases when an abnormal load is connected. Abnormal heat generation, failure, fire, or abnormal heat generation such as lamps and sockets can be avoided. When the ambient temperature changes, preheating is performed to satisfy the product specification of “continue normal lighting when a normal load is connected”. It is possible to avoid an excessive increase in filament temperature due to repeated modes and a shortened lamp life.

  In the DC detection circuit 114, a DC bias voltage from the DC voltage Vdc is applied to the parallel circuit of the resistor R2 and the capacitor C7 via the resistor R11, the filament F1, the transformer T1, and the resistor R1, and the capacitor is generated by the voltage across the resistor R2. C7 is charged and output to the comparator 105 as a charging voltage Vc7 via the diode D1. The charging voltage Vc7 may exceed the reference voltage VrefE (second reference voltage) when the transient voltage at the start of power supply to the discharge lamps FL1 and FL2 is resistance-divided. However, the inverter control circuit 106 does not stop the power supply to the discharge lamps FL1 and FL2 from when the power is turned on until the mask period ends even if the output signal VEL of the comparator 105 becomes high level. Even if the voltage of the charging voltage Vc8 output from the DC detection circuit 114 when the power is turned on exceeds the reference voltage VrefE and the signal VEL is output from the comparator 105 at a high level, the mask function is provided. The power supply to the electric lights FL1, FL2 is not stopped. For this purpose, the mask period is determined according to the transient response time at the start of power supply.

  When power is supplied to the discharge lamps FL1 and FL2 and the discharge lamps FL1 and FL2 are turned on, the impedances of the discharge lamps FL1 and FL2 are lowered. The impedance at the time of lighting varies depending on the ratings of the discharge lamps FL1 and FL2, but is generally several hundred Ω to several kΩ. The resistors R1 and R2 constituting the DC detection circuit 114 are constituted by several tens kΩ to several hundreds kΩ so as not to affect the resonance load circuit. Therefore, when the discharge lamps FL1 and FL2 are lit, the charging voltage Vc7 is hardly generated under the condition that no DC voltage is generated in the discharge lamps FL1 and FL2, and the charging voltage Vc7 input to the comparator 105 via the diode D1. Since the reference voltage VrefE is not exceeded, the output signal VEL of the comparator 105 is output to the inverter control circuit 016 at a low level, and the power supply to the discharge lamps FL1 and FL2 is continued without being stopped.

  In the DC detection circuit 116, a DC bias voltage from the DC voltage Vdc is applied to the parallel circuit of the resistor R4 and the capacitor C9 via the resistor R3, the capacitor C9 is charged by the voltage across the resistor R4, and a diode is connected to the comparator 105. The charge voltage Vc9 is output via D3. The charging voltage Vc9 may exceed the reference voltage VrefE due to the resistance voltage of the transient voltage at the start of power supply to the discharge lamps FL1 and FL2. However, since the inverter control circuit 106 is provided with the mask function, the voltage of the charging voltage Vc9 output from the DC detection circuit 116 when the power is turned on exceeds the reference voltage VrefE, and the signal VEL from the comparator 105 is at a high level. Even if it is output, the power supply to the discharge lamps FL1, FL2 is not stopped.

  When electric power is supplied to the discharge lamps FL1 and FL2 and the discharge lamps FL1 and FL2 are turned on, the impedance of the discharge lamps FL1 and FL2 is reduced, so that no DC voltage is generated in the discharge lamps FL1 and FL2. The charging voltage Vc9 hardly occurs and the charging voltage Vc9 inputted to the comparator 105 via the diode D3 does not exceed the reference voltage VrefE, so that the output signal VEL of the comparator 105 is outputted to the inverter control circuit 016 at the low level. The power supply to the discharge lamps FL1, FL2 is continued without being stopped.

  In the filament defect detection circuit 108, the DC voltage E1 output from the detection voltage source 115 is divided by the parallel circuit of the resistors R6, R7 and the resistors R8, R9 and the resistor R10, and the voltage across the resistor R10 is used. The capacitor C8 is charged. Since the detection voltage source 115 does not output the output voltage E1 before the start of the oscillation operation of the inverter by the transistors Q1 and Q2, and outputs the DC voltage E1 after the on / off operation of the transistors Q1 and Q2 is started. The capacitor C8 is not charged before the on / off operation of the transistors Q1 and Q2 is started. In the mask period after the power is turned on, the charging voltage Vc8 of the capacitor C8 output from the filament defect detection circuit 108 exceeds the reference voltage VrefE, and the signal VEL is output from the comparator 105 at a high level. Even so, the inverter control circuit 106 does not stop the power supply to the discharge lamps FL1, FL2.

  Then, when electric power is supplied to the discharge lamps FL1 and FL2 and the discharge lamps FL1 and FL2 are turned on, the impedance of the discharge lamps FL1 and FL2 decreases. The resistors R6 to R10 are configured with relatively large resistance values (about several tens of kΩ to several MΩ) that do not affect the resonant load circuit. Accordingly, when the discharge lamps FL1 and FL2 are turned on, the charging voltage Vc8 hardly occurs, and the charging voltage Vc9 input to the comparator 105 via the diode D2 does not exceed the reference voltage VrefE. Is output to the inverter control circuit 016 at a low level, and power supply to the discharge lamps FL1 and FL2 is continued without being stopped.

  Note that the non-inverting input terminal of the comparator 105 is charged at the highest voltage value among the charging voltage Vc7 of the capacitor C7, the charging voltage Vc8 of the capacitor C8, and the charging voltage Vc9 of the capacitor C9 by the diodes D1, D2, and D3. Vcn is input.

  Next, the operation in the case where the filament breakage or the pole connection failure occurs when the power is turned on will be described.

[Defect at power-on-1]
First, the operation when the filament F1 is disconnected or the connection failure of the pole (1) or the pole (2) occurs when the power is turned on will be described.

  In this case, in the no-load detection circuit 109, the DC bias path for supplying the DC voltage Vdc from the power supply unit 102 to the capacitor C10 is interrupted, so the capacitor C10 is not charged, and therefore the charging voltage Vc10 is equal to or lower than VrefN. Then, the signal VNL is output at a low level from the comparator 104, the on / off operation of the transistors Q1, Q2 by the inverter control circuit 106 is not started, and the discharge lamps FL1, FL2 are not lit.

[Defect at power-on-2]
Next, the operation when the filament F4 is disconnected or the connection failure of the pole (5) or the pole (6) occurs when the power is turned on will be described.

  In this case, in the no-load detection circuit 113, since the resistance values at the pole (5), the filament F4, and the pole (6) connected in parallel with the resistors R16 and R17 increase, the DC voltage output from the power supply unit 102 is increased. Vdc sufficiently supplies a base current to the transistor Q3 via the resistors R15 and R16, and the transistor Q3 is turned on. Then, since the resistor R18 is set to a resistance value that significantly reduces the voltage dividing ratio of the resistor R14 connected in parallel with the series circuit of the transistor Q3 and the resistor R18, the charging voltage Vc10 of the capacitor C10 is equal to or lower than the reference voltage VrefN. It becomes. Then, the signal VNL is output at a low level from the comparator 104, the on / off operation of the transistors Q1, Q2 by the inverter control circuit 106 is not started, and the discharge lamps FL1, FL2 are not lit.

[Defect at power-on-3]
Next, the operation when the filaments F2 and F3 are disconnected or the connection failure of the pole (3), the pole (4), and the connecting portion (7) occurs when the power is turned on will be described.

  In this case, in the no-load detection circuit 109, since the DC bias path for supplying the DC voltage Vdc from the power supply unit 102 to the capacitor C10 is interrupted, the capacitor C10 is not charged, and therefore the charging voltage Vc10 is equal to or lower than VrefN. Then, the signal VNL is output at a low level from the comparator 104, the on / off operation of the transistors Q1, Q2 by the inverter control circuit 106 is not started, and the discharge lamps FL1, FL2 are not lit.

  Here, since the oscillation voltage supply source 118 does not output the output voltage E2 before the on / off operation of the transistors Q1 and Q2 is started, the capacitor C10 is not charged via the diode D4 when the power is turned on. The detection operation by the no-load detection circuit 109 is not hindered by the oscillation voltage supply source 118.

  Further, since the detection voltage source 115 of the filament defect detection circuit 108 does not output the output voltage E1 before the on / off operation of the transistors Q1 and Q2 is started, the resistors R8, R9 from the detection voltage source 115 when the power is turned on. , R7, R13, and the path through the diode D4, and the path from the resistor R6 through the secondary winding 111, the resistor R13, and the diode D4, the capacitor C10 is not charged. The detection operation by the load detection circuit 109 is not hindered.

  As described above, when the power is turned on, the connection points in the discharge lamps FL1, FL2 including the filaments F2, F3 connected in series, the pole (3), the pole (4), and the connection part (7) are defective. Thus, it is possible to prevent the discharge lamps FL1 and FL2 from being turned on.

  An operation in the case where a filament breakage or a poor electrode connection occurs during normal lighting after the mask period has elapsed after power-on will be described.

[Defect at normal lighting-1]
First, the operation when the connection of the pole (1) becomes defective during normal lighting after the mask period has elapsed will be described.

  In this case, the lamp current flowing through the resonant load circuit is from the transformer T1 to the capacitor C3, the secondary winding 110, the pole (2), the filament F1, the discharge lamp FL1, the filament F2, the connection part (7), the filament F3, the discharge lamp. It flows along the path to the ground via FL2, the filament F4, and the pole (6). Since the high-frequency voltage is continuously generated at the connection portion between R12 and the capacitor C2 in the no-load detection circuit 109, the charging voltage Vc10 of the capacitor C10 maintains the normal lighting potential. Accordingly, since the charging voltage Vc10 exceeds the reference voltage VrefN and the output signal VNL of the comparator 104 is at a high level, the connection failure of the pole (1) is not detected by the no-load detection circuit 109.

  On the other hand, in the DC detection circuit 114, in this case, the DC detection circuit 114 and the no-load detection circuit 109 are configured in parallel with the series circuit component of the capacitor C3 and the discharge lamps FL1 and FL2 (R11). Is excluded). If this combined impedance is Z1, the capacitor C1 and the capacitor C3 share the voltage obtained by dividing the DC component voltage of the capacitor C1 by the resistor R5 and the impedance Z1, respectively. As a result, a direct-current voltage component is generated in the series configuration portion of the capacitor C3 and the discharge lamps FL1 and FL2, and thus a direct-current voltage component is also generated in the DC detection circuit 114. Therefore, the charging voltage Vc7 of the capacitor C7 exceeds the reference voltage VrefE, the on / off operation of the transistors Q1 and Q2 is stopped by the comparator 105 and the inverter control circuit 106, and power supply to the discharge lamps FL1 and FL2 is stopped. The discharge lamps FL1 and FL2 are turned off.

  Then, after the on / off operation of the transistors Q1 and Q2 is stopped as described above, the on / off operation of the transistors Q1 and Q2 is started again after a certain period of time. ], The DC bias path for supplying the DC voltage Vdc from the power supply unit 102 to the capacitor C10 is cut off, so that the capacitor C10 is not charged, and therefore the charging voltage Vc10 is equal to or lower than VrefN. Then, the signal VNL is output from the comparator 104 at a low level, the on / off operation of the transistors Q1 and Q2 by the inverter control circuit 106 is not started, and the discharge lamps FL1 and FL2 are turned off.

[Defect at normal lighting-2]
Next, an operation when the pole (2) becomes poorly connected during normal lighting after the mask period has elapsed will be described.

  The lamp current path that flows through the resonant load circuit when the pole (2) is poorly connected is the same as the lamp current path (transformer T1, pole (1), discharge lamps FL1, FL2) during normal operation, but is normal. , The discharge lamps FL1 and FL2 connected in parallel with the resistors R3 and R4 in the DC detection circuit 116 are separated by the pole (2), and are discharged from the connection point of the resistors R11 and R3 through the secondary winding 110. Since the current path to the electric lamps FL1 and FL2 is DC-isolated by the capacitor C3, the voltage dividing ratio of the resistors R11, R3 and R4 is not affected by the impedance of the discharge lamps FL1 and FL2. Accordingly, the capacitor C9 is charged by the voltage determined by the voltage dividing ratio of the resistors R11, R3, and R4, and the charging voltage Vc9 of the capacitor C9 exceeds the reference voltage VrefE. Therefore, the comparator 105 and the inverter control circuit 106 cause the transistors Q1 and Q2 to The on / off operation is stopped, power is not supplied to the discharge lamps FL1 and FL2, and the discharge lamps FL1 and FL2 are turned off.

  Also in this case, after the on / off operation of the transistors Q1 and Q2 is stopped, the on / off operation of the transistors Q1 and Q2 is started again after a certain period of time, but the above-mentioned [defect at power-on-1] occurs. As in the case of the operation, the DC bias path for supplying the DC voltage Vdc from the power supply unit 102 to the capacitor C10 is cut off, so that the capacitor C10 is not charged and the transistors Q1 and Q2 are turned on / off by the inverter control circuit 106. The operation is not started, and the discharge lamps FL1 and FL2 are kept off.

[Defect at normal lighting-3]
Next, when the filament F1 is disconnected at the time of normal lighting after the mask period has elapsed, the same detection function as in the case of [Fault at normal lighting-1] [Fault at normal lighting-2] described above works. The inverter control circuit 106 stops the on / off operation of the transistors Q1 and Q2, the power supply to the discharge lamps FL1 and FL2 is stopped, and the discharge lamps FL1 and FL2 are turned off.

  Also in this case, after the on / off operation of the transistors Q1 and Q2 is stopped, the on / off operation of the transistors Q1 and Q2 is started again after a certain period of time, but the above-mentioned [defect at power-on-1] occurs. As in the case of the operation, the DC bias path for supplying the DC voltage Vdc from the power supply unit 102 to the capacitor C10 is cut off, so that the capacitor C10 is not charged and the transistors Q1 and Q2 are turned on / off by the inverter control circuit 106. The operation is not started, and the discharge lamps FL1 and FL2 are kept off.

[Defect at normal lighting-4]
Next, when disconnection of the filament F4 or poor connection of the pole (5) or the pole (6) occurs during normal lighting after the mask period has elapsed, the above-mentioned [defect at power-on-2] occurs. Similarly to the case, the disconnection or connection failure is detected by the no-load detection circuit 113, the on / off operation of the transistors Q1, Q2 is stopped, and the discharge lamps FL1, FL2 are turned off.

[Defect at normal lighting -5]
Next, the operation when a connection failure of the pole (3) or the pole (7) occurs during normal lighting after the mask period has elapsed will be described.

  When the pole (3) is poorly connected, the path of the lamp current flowing through the discharge lamps FL1 and FL2 does not change and flows through the connection (7). Then, in the filament defect detection circuit 108, in the current path from the detection voltage source 115 to the parallel circuit of the resistor R10 and the capacitor C8 via the resistor R6, the secondary winding 111, and the resistor R7, the resistors R7 and R10 are used. Since the discharge lamp FL2 exists in parallel with the series configuration, the charging voltage Vc8 of the capacitor C8 hardly occurs. On the other hand, in the current path from the detection voltage source 115 via the resistors R8 and R9 to the parallel circuit of the resistor R10 and the capacitor C8, the discharge lamp is not connected in parallel to the series configuration of the resistors R9 and R10 (capacitor). The series circuit of the resistors R9 and R10 is separated from the discharge lamp by C4). Accordingly, the capacitor C8 is charged with a DC voltage obtained by dividing the DC voltage E1 by the resistors R8, R9, and R10. Since the charging voltage Vc8 of the capacitor C8 exceeds the reference voltage VrefE, the comparator 105 and the inverter control circuit 106 The on / off operation of the transistors Q1 and Q2 is stopped, the power supply to the discharge lamps FL1 and FL2 is stopped, and the discharge lamps FL1 and FL2 are turned off.

  Also in this case, after the on / off operation of the transistors Q1 and Q2 is stopped, the on / off operation of the transistors Q1 and Q2 is started again after a certain period of time, but the above-mentioned [defect at power-on-1] occurs. As in the case of the operation, the DC bias path for supplying the DC voltage Vdc from the power supply unit 102 to the capacitor C10 is cut off, so that the capacitor C10 is not charged and the transistors Q1 and Q2 are turned on / off by the inverter control circuit 106. The operation is not started, and the discharge lamps FL1 and FL2 are kept off.

[Defect at normal lighting -6]
Next, when a connection failure of the pole (7) occurs during normal lighting after the mask period has elapsed, the path of the lamp current from the discharge lamp FL1 via the pole (7) to the discharge lamp FL2 is cut off. Therefore, the path of the lamp current changes and becomes a current path that reaches the discharge lamp FL2 via the discharge lamp FL1, the pole (3), the capacitor C4, the secondary winding 111, and the pole (4). In this case, since the discharge lamp is not connected in parallel to the series configuration portion of the resistors R9 and R10 in the filament defect detection circuit 108 and there is no connection of a low impedance element, the capacitor C8 applies the DC voltage E1 to the resistors R8, R9, and R10. Since the charging voltage Vc8 of the capacitor C8 exceeds the reference voltage VrefE, the on / off operation of the transistors Q1 and Q2 is stopped by the comparator 105 and the inverter control circuit 106, and the discharge lamp FL1 is charged. , FL2 is no longer supplied with power, and the discharge lamps FL1, FL2 are turned off.

  Also in this case, after the on / off operation of the transistors Q1 and Q2 is stopped, the on / off operation of the transistors Q1 and Q2 is started again after a certain period of time, but the above-mentioned [defect at power-on-1] occurs. As in the case of the operation, the DC bias path for supplying the DC voltage Vdc from the power supply unit 102 to the capacitor C10 is cut off, so that the capacitor C10 is not charged and the transistors Q1 and Q2 are turned on / off by the inverter control circuit 106. The operation is not started, and the discharge lamps FL1 and FL2 are kept off.

[Defects during normal lighting -7]
Next, the operation when a connection failure of the pole (4) occurs during normal lighting after the mask period has elapsed will be described. When the pole (4) is poorly connected, the lamp current path in the discharge lamps FL1 and FL2 does not change and flows through the connection (7). In this case, in the filament defect detection circuit 108, since the discharge lamp FL2 exists in parallel with the series configuration of the resistors R9 and R10, the charging voltage Vc8 of the capacitor C8 hardly occurs. On the other hand, since the discharge lamp is not connected in parallel to the series configuration of the resistors R7 and R10, there is no connection of a low impedance element (the capacitor C4 separates the series circuit of the resistors R7 and R10 from the discharge lamp). The capacitor C8 is charged with a DC voltage obtained by dividing the DC voltage E by the resistors R6, R7, and R10. Since the charging voltage Vc8 of the capacitor C8 exceeds the reference voltage VrefE, the comparator 105 and the inverter control circuit 106 use the transistor The on / off operations of Q1 and Q2 are stopped, power supply to the discharge lamps FL1 and FL2 is stopped, and the discharge lamps FL1 and FL2 are turned off.

  Also in this case, after the on / off operation of the transistors Q1 and Q2 is stopped, the on / off operation of the transistors Q1 and Q2 is started again after a certain period of time, but the above-mentioned [defect at power-on-1] occurs. As in the case of the operation, the DC bias path for supplying the DC voltage Vdc from the power supply unit 102 to the capacitor C10 is cut off, so that the capacitor C10 is not charged and the transistors Q1 and Q2 are turned on / off by the inverter control circuit 106. The operation is not started, and the discharge lamps FL1 and FL2 are kept off.

[Defect at normal lighting -8]
Next, when the filament F2 or the filament F3 is disconnected at the time of normal lighting after the mask period has elapsed, the filament failure detection is performed in the same manner as the above [Normal lighting failure-5] or [Normal lighting failure-6]. The circuit 108 operates, the on / off operation of the transistors Q1 and Q2 is stopped, the power supply to the discharge lamps FL1 and FL2 is stopped, and the discharge lamps FL1 and FL2 are turned off.

  Thus, the discharge lamp lighting device 5 shown in FIG. 1 and the lighting fixture 1 using the same are, for example, when the power is turned on or when the load is remounted, the filaments F2 and F3 connected in series, the pole (3), Including defects in the pole (4) and the connection part (7), defects in the connection points of the electrodes (1) to (6) and the connection part (7) in the discharge lamps FL1 and FL2, and breakage of the filaments F1 to F4, Detected at all points. Therefore, if the filament or pole is defective, the lighting of the discharge lamps FL1 and FL2 is not started when the power is turned on, and the filament and pole are also removed when the discharge lamps FL1 and FL2 are removed and the discharge lamps FL1 and FL2 are remounted. Is not normally connected, the power supply to the discharge lamps FL1, FL2 can be stopped. In addition, even during normal lighting, it is possible to detect connection failures such as terminals and wiring connected to the discharge lamps FL1 and FL2, and failures such as filament breakage, so these failures can be prevented without reaching the arc generation mode. The discharge lamps FL1 and FL2 can be extinguished.

  As a result, even when it is attempted to light the discharge lamps FL1 and FL2 when a connection point such as a terminal is defective or the filament is broken, voltage stress applied to the components (for example, the transistors Q1 and Q2) of the discharge lamp lighting device 5 Can be reduced. In addition, while the user is installing the discharge lamps FL1 and FL2, the poles (1) and (2) are connected first, and the connection of the pole (3), the pole (4), and the connecting portion (7) is completed. Since the lighting of the discharge lamps FL1 and FL2 is not started in a state where it is not, a sense of security can be given to the user.

  Compared with the discharge lamp lighting device according to the background art shown in FIG. 12, the discharge lamp lighting device 5 according to the present invention shown in FIG. 1 requires almost no additional parts, thereby suppressing an increase in cost. The problem of the discharge lamp lighting device shown in FIG. 12 can be solved.

  Further, the voltage applied to the discharge lamps FL1, FL2 transiently increases when the power is turned on, and the charging voltage Vcn output from one of the filament defect detection circuit 108 and the DC detection circuits 114, 116 is Although it is conceivable that the reference voltage VrefE is exceeded, the control circuit unit 103 has the above-described mask function, so that it is possible to prevent the discharge lamps FL1 and FL2 from being unlit due to such a transient voltage rise when the power is turned on. is doing.

  Although the case where two discharge lamps are connected in series has been described as an example, three or more discharge lamps may be connected in series. In this case, a circuit similar to the filament defect detection circuit 108 and the no-load detection circuit 109 may be provided in the connection portion where the discharge lamps are connected in series.

(Second Embodiment)
Next, a discharge lamp lighting device according to a second embodiment of the present invention will be described. FIG. 5 is a circuit diagram showing an example of the configuration of the discharge lamp lighting device according to the second embodiment of the present invention.

  The discharge lamp lighting device 5a shown in FIG. 5 is different from the discharge lamp lighting device 5 shown in FIG. 1 in the following points. First, in the discharge lamp lighting device 5a shown in FIG. 5, instead of the resistor R5 in the discharge lamp lighting device 5, a series circuit of a resistor R5 and a diode D6 is connected in parallel with the capacitor C1. The connection point of the drain of the transistor Q2, the resistor R5, and the capacitor C1 is connected to the connection point of the resistors R6 and R8 in the filament defect detection circuit 108, and further via the resistor R19 and the diode D5, the no-load detection circuit 109. Are connected to a connection point of the diode D4, the capacitor C10, and the comparator 104 in FIG. That is, the high-frequency rectangular wave voltage generated at the connection point of the transistors Q1 and Q2 by alternately turning on and off the transistors Q1 and Q2, the DC voltage E1 output from the detection voltage source 115a, and the oscillation voltage supply source 118a. Is used as the direct-current voltage E2 output.

  Since the other configuration is the same as that of the discharge lamp lighting device 5 shown in FIG. 1, the description thereof will be omitted, and the operation of the present embodiment will be described below.

  First, the operation of turning on the discharge lamps FL1 and FL2 in the discharge lamp lighting device 5a and the operation of not detecting or turning off the discharge lamp by detecting a failure such as a connection failure are the same as those of the discharge lamp lighting device 5 shown in FIG. Since it is the same, the description is abbreviate | omitted.

  Next, the detection voltage source 115a and the oscillation voltage supply source 118a using the high-frequency rectangular wave voltage will be described. First, in a state before the on / off operation of the transistors Q1 and Q2 is started by the inverter control circuit 106, the transistors Q1 and Q2 are both off, and equivalently, both hold minute capacitance components. The voltage across the transistor Q2 is almost 0V. Most of the DC voltage Vdc is applied to the transistor Q1. Therefore, before the on / off operation of the transistors Q1, Q2 is started, that is, before the power supply for starting the discharge lamps FL1, FL2 is started, the detection voltage source 115a and the oscillation voltage supply source The DC voltages E1 and E2 output from 118a are approximately 0V.

  FIG. 6 is a diagram showing a DC equivalent circuit of the discharge lamp lighting device 5a before the on / off operation of the transistors Q1 and Q2 is started. In FIG. 6, the combined impedance for each detection circuit is indicated by a block. The transformer T1 ideally has a DC resistance of 0Ω, and the capacitor C2 is ideally omitted because the DC resistance is ideally infinite. It is assumed that the wiring to each discharge lamp FL1, FL2 is normally connected. In this case, the impedance of the DC detection circuit 114 is connected in parallel to the transistor Q2, and further, the filament defect detection circuit 108, the no-load detection circuit 109, the no-load detection circuit 113, and the DC detection are connected via the resistor R5 and the diode D6. A parallel circuit of the circuit 116 is connected.

  On the other hand, the resistor R11 is DC-connected to the transistor Q1 by the diode D6, and the impedance is not connected. Therefore, the voltage dividing ratio due to the capacitance of the transistors Q1 and Q2 is increased on the transistor Q1 side. Therefore, most of the DC voltage Vdc is applied to the transistor Q1, and the drain terminal of the transistor Q2 becomes approximately 0V.

  Further, during normal operation, a voltage is applied to the capacitor C1 in the direction of the arrow 117 shown in FIG. The resistor R5 is set to several tens kΩ to several hundreds kΩ. For this reason, almost no current flows through the diode D6 during normal operation, no reverse bias is applied, and no transient resonance voltage is applied, so that the diode D6 does not require a diode having a high recovery characteristic. Further, since the filament defect detection circuit 108 does not require a large current to detect a defect, the current capacity of the diode D6 can be reduced, and therefore an inexpensive diode can be used as the diode D6.

  Since the detection voltage source 115a and the oscillation voltage supply source 118a of this embodiment function in the same manner as the detection voltage source 115 and the oscillation voltage supply source 118 shown in FIG. 1, the discharge lamp lighting device 5a shown in FIG. And the lighting fixture using this can show an effect similar to the discharge lamp lighting device 5 shown in FIG.

(Third embodiment)
Next, a discharge lamp lighting device according to a third embodiment of the present invention will be described. FIG. 7 is a circuit diagram showing an example of the configuration of the discharge lamp lighting device according to the third embodiment of the present invention.

  The discharge lamp lighting device 5b shown in FIG. 7 differs from the discharge lamp lighting device 5a shown in FIG. 5 in the following points. First, in the discharge lamp lighting device 5b shown in FIG. 7, in parallel with the transistor Q2, a DC component cutting capacitor C6 (third capacitor), a preheating transformer T2 (first transformer), and a transistor Q4 (third A preheating cut circuit 119 composed of a series circuit of switching elements) is connected. The transformer T1 does not include the secondary windings 110, 111, and 112, the transformer T2 includes the secondary windings 110, 111, and 112, and one end c of the secondary winding 111 is connected to the capacitor C4 (fourth The other end d is connected to the pole (4). The inverter control circuit 106a controls on / off of the transistor Q4 in addition to the transistors Q1 and Q2. Drive circuit 107a turns on / off transistors Q1, Q2, and Q4 in response to a control signal from inverter control circuit 106a.

  Since the other configuration is the same as that of the discharge lamp lighting device 5a shown in FIG. 5, the description thereof will be omitted, and the operation of the present embodiment will be described below.

  First, the operation of turning on the discharge lamps FL1 and FL2 in the discharge lamp lighting device 5b and the operation of not turning on or turning off the discharge lamp by detecting a defect such as a connection failure are the same as those of the discharge lamp lighting device 5a shown in FIG. Since it is the same, the description is abbreviate | omitted.

  The discharge lamp lighting device 5b shown in FIG. 7 differs from the discharge lamp lighting device 5a of FIG. 5 in the preheating operation of the filaments F1, F2, F3, and F4. First, the inverter control circuit 106a turns on the transistor Q4 during the period from when the power is turned on to when the preceding preheating starts and during the preceding preheating mode. As a result, a current flows through the transformer T2 of the preheating cut circuit 119, and the filaments F1, filaments F2, F3, and filaments F4 are passed from the secondary windings 110, 111, and 112 of the transformer T2 via the capacitors C3, C4, and C5, respectively. A pre-heating current for heating flows, and the filaments F1, F2, F3, and F4 are pre-heated.

  In the start mode and the normal lighting mode, the transistor Q4 is turned off by the inverter control circuit 106a, the current does not flow to the preheating cut circuit 119, and the constant preheating current of the filaments F1, F2, F3, and F4 is cut. The Thereby, the power loss in the discharge lamp lighting device 5b can be reduced.

(Fourth embodiment)
Next, a discharge lamp lighting device according to a fourth embodiment of the present invention will be described. FIG. 8 is a circuit diagram showing an example of the configuration of a discharge lamp lighting device according to the fourth embodiment of the present invention.

  The discharge lamp lighting device 5c shown in FIG. 8 is different from the discharge lamp lighting device 5b shown in FIG. 7 in the following points. First, in the discharge lamp lighting device 5c shown in FIG. 8, the connection point between the capacitor C6 and the transformer T2 in the preheating cut circuit 119 is connected to the connection point between the resistors R6 and R8 in the filament defect detection circuit 108, and further, the resistor R19, diode The connection point of the diode D4, the capacitor C10, and the comparator 104 in the no-load detection circuit 109 is connected via D5. That is, the voltage generated at the connection point between the capacitor C6 and the transformer T2 is used as the DC voltage E1 output from the detection voltage source 115b and the DC voltage E2 output from the oscillation voltage supply source 118b. Further, the discharge lamp lighting device 5c does not include the diode D6 of FIG.

  Since the other configuration is the same as that of the discharge lamp lighting device 5b shown in FIG. 7, the description thereof will be omitted, and the operation of the present embodiment will be described below.

  First, the operation of turning on the discharge lamps FL1 and FL2 in the discharge lamp lighting device 5c, the operation of not detecting or turning off the discharge lamp by detecting a failure such as a connection failure, and the preheating operation of the filament are shown in FIG. Since it is the same as that of the discharge lamp lighting device 5b, the description thereof is omitted.

  Next, the detection voltage source 115b and the oscillation voltage supply source 118b using the high-frequency rectangular wave voltage will be described. First, since the transistor Q4 is turned on by the inverter control circuit 106a when the power is turned on, the DC voltages E1 and E2 become the ground potential via the transistor Q4 and the transformer T2, and become approximately 0V. During normal operation, the transistor Q4 is turned off by the inverter control circuit 106a, so that the voltage across the transistor Q2 is applied as the DC voltages E1 and E2 (pulse voltage with the DC voltage Vdc as a peak). Therefore, in the detection voltage source 115b and the oscillation voltage supply source 118b, the on / off operation of the transistors Q1 and Q2 is started by the inverter control circuit 106a, and power supply for lighting the discharge lamps FL1 and FL2 is started. Later, output of DC voltages E1 and E2 is started.

  Accordingly, the detection voltage source 115b and the oscillation voltage supply source 118b function in the same manner as the detection voltage source 115a and the oscillation voltage supply source 118a shown in FIG. 7, and thus the discharge lamp lighting device 5c shown in FIG. The lighting fixture using this can have the same effect as the discharge lamp lighting device 5b shown in FIG. Moreover, the diode D5 of the discharge lamp lighting device 5b shown in FIG. 7 can be eliminated, and the circuit can be simplified and the cost can be reduced. The detection voltage source 115b and the oscillation voltage supply source 118b can obtain the same effect even when the voltage generated at the connection point between the transformer T2 and the transistor Q4 is supplied as the DC voltages E1 and E2.

(Fifth embodiment)
Next, a discharge lamp lighting device according to a fifth embodiment of the present invention will be described. FIG. 9 is a circuit diagram showing an example of the configuration of a discharge lamp lighting device according to the fifth embodiment of the present invention.

  The discharge lamp lighting device 5d shown in FIG. 9 is different from the discharge lamp lighting device 5 shown in FIG. 1 in the following points. First, in the discharge lamp lighting device 5d shown in FIG. 9, the transformer T1 (second transformer) connected in series to the capacitor C1 (fifth capacitor) includes a control power supply in addition to the secondary windings 110, 111, and 112. A secondary winding for supply 120a is provided, and one end c of the secondary winding 111 is connected to the pole (3) through a capacitor C4 (sixth capacitor), and the other end d is connected to the pole (4). Connected with. One end of the secondary winding 120a is connected to the ground, and the other end is connected to the rectifying diode D5 and the diode D7. The output of the secondary winding 120a rectified by the diode D7 is supplied as the control voltage Vcc of the discharge lamp lighting device 5d. The control power supply Vcc by the secondary winding 120a has a function of supplying a relatively large current consumption required when the inverter control circuit 106 and the drive circuit 107 of the control circuit unit 103 are in an operating state. By being configured separately from a standby control power supply (not shown) for supplying a relatively small current consumption required during standby of the inverter control circuit 106 and the drive circuit 107, standby power consumption of the discharge lamp lighting device 5d is achieved. It is a component for the purpose of supplying necessary current consumption in an operating state while suppressing power.

  On the other hand, the output of the secondary winding 120a rectified by the diode D5 is connected to the connection point of the diode D4, the capacitor C10, and the comparator 104 in the no-load detection circuit 109 via the resistor R19. The secondary winding 120a, the diode D5, and the resistor R19 constitute an oscillation voltage supply source 118c, and the output of the secondary winding 120a is used as the DC voltage E2 through the diode D5 and the resistor R19. That is, the output of the secondary winding 120a is shunted to generate the DC voltage E2 of the oscillation voltage supply source 118c.

  Since the other configuration is the same as that of the discharge lamp lighting device 5 shown in FIG. 1, the description thereof will be omitted, and the operation of the present embodiment will be described below.

  First, the operation of turning on the discharge lamps FL1 and FL2 in the discharge lamp lighting device 5d and the operation of not turning on or turning off the discharge lamp by detecting a defect such as a connection failure are the same as those of the discharge lamp lighting device 5 shown in FIG. Since it is the same, the description is abbreviate | omitted.

  Next, the operation of the oscillation voltage supply source 118c will be described. First, since the inverter control circuit 106 starts the on / off operation of the transistors Q1 and Q2, and before the power supply for lighting the discharge lamps FL1 and FL2 is started, no current flows through the transformer T1, so the secondary winding. No voltage is generated on the line 120a. Then, the DC voltage E2 is output after the on / off operation of the transistors Q1 and Q2 is started. As a result, the oscillation voltage supply source 118c functions in the same manner as the oscillation voltage supply source 118 shown in FIG. 1. Therefore, the discharge lamp lighting device 5d shown in FIG. 9 and the lighting fixture using the same are shown in FIG. The same effect as the discharge lamp lighting device 5 can be obtained.

  Also, the detection power supply 115 may output the DC voltage E1 using the output of the secondary winding 120a similarly to the oscillation voltage supply source 118c, or may be used in the discharge lamp lighting device 5a of FIG. A configuration similar to that of the detection power source 115a may be used (see the broken line in FIG. 9).

(Sixth embodiment)
Next, a discharge lamp lighting device according to a sixth embodiment of the present invention will be described. FIG. 10 is a circuit diagram showing an example of the configuration of a discharge lamp lighting device according to the sixth embodiment of the present invention.

  The discharge lamp lighting device 5e shown in FIG. 10 is different from the discharge lamp lighting device 5 shown in FIG. 1 in the following points. First, in the discharge lamp lighting device 5d shown in FIG. 10, a preheating circuit 119a comprising a series circuit of a DC component cutting capacitor C6 (third capacitor) and a preheating transformer T2 (first transformer) in parallel with the transistor Q2. Is connected. Furthermore, the transformer T1 does not include the secondary windings 110, 111, and 112, and the transformer T2 includes the secondary winding 120b for supplying control power in addition to the secondary windings 110, 111, and 112. One end of the secondary winding 120b is connected to the ground, and the other end is connected to the rectifying diode D5 and the diode D7. The output of the secondary winding 120b rectified by the diode D7 is supplied as the control voltage Vcc of the discharge lamp lighting device 5d. The control power supply Vcc by the secondary winding 120b has a function of supplying a relatively large current consumption required when the inverter control circuit 106 and the drive circuit 107 of the control circuit unit 103 are in an operating state. By being configured separately from the standby control power supply (not shown) for supplying a relatively small current consumption required during standby of the inverter control circuit 106 and the drive circuit 107, standby power consumption of the discharge lamp lighting device 5e is achieved. It is a component for the purpose of supplying necessary current consumption in an operating state while suppressing power.

  On the other hand, the output of the secondary winding 120b rectified by the diode D5 is connected to the connection point of the diode D4, the capacitor C10, and the comparator 104 in the no-load detection circuit 109 via the resistor R19. The secondary winding 120b, the diode D5, and the resistor R19 constitute an oscillation voltage supply source 118d, and the output of the secondary winding 120b is used as the DC voltage E2 through the diode D5 and the resistor R19. That is, the output of the secondary winding 120b is shunted to generate the DC voltage E2 of the oscillation voltage supply source 118d.

  Since the other configuration is the same as that of the discharge lamp lighting device 5 shown in FIG. 1, the description thereof will be omitted, and the operation of the present embodiment will be described below.

  First, the operation of turning on the discharge lamps FL1 and FL2 in the discharge lamp lighting device 5d and the operation of not turning on or turning off the discharge lamp by detecting a failure such as a connection failure are the same as those of the discharge lamp lighting device 5 shown in FIG. Since it is the same, the description is abbreviate | omitted.

  Next, the operation of the oscillation voltage supply source 118d will be described. First, since the inverter control circuit 106 starts the on / off operation of the transistors Q1 and Q2 and before the power supply for lighting the discharge lamps FL1 and FL2 is started, no current flows through the transformer T2. No voltage is generated on the line 120b. Then, after the on / off operations of the transistors Q1 and Q2 are started, a current flows through the transformer T2 and a DC voltage E2 is output. Accordingly, the oscillation voltage supply source 118d functions in the same manner as the oscillation voltage supply source 118 shown in FIG. 1, and therefore the discharge lamp lighting device 5e shown in FIG. 10 and the lighting fixture using the same are shown in FIG. The same effect as the discharge lamp lighting device 5 can be obtained.

  Also, the detection power source 115 may output the DC voltage E1 using the output of the secondary winding 120b in the same manner as the oscillation voltage supply source 118d, or it is used in the discharge lamp lighting device 5a of FIG. A configuration similar to that of the detection power source 115a may be used (see a broken line in FIG. 10).

(Seventh embodiment)
Next, a discharge lamp lighting device according to a seventh embodiment of the present invention will be described. FIG. 11 is a circuit diagram showing an example of the configuration of a discharge lamp lighting device according to the seventh embodiment of the present invention.

  The discharge lamp lighting device 5f shown in FIG. 11 is different from the discharge lamp lighting device 5 shown in FIG. 1 in the following points. First, in the discharge lamp lighting device 5f shown in FIG. 11, a preheating circuit 119b including a series circuit of a DC component cutting capacitor C6 and a preheating transformer T2 is connected in parallel with the transistor Q2. Further, the transformer T1 does not include the secondary windings 110, 111, and 112, and the transformer T2 includes the secondary windings 110, 111, and 112.

  Further, a series circuit of a capacitor C12 and a diode D9 is connected between both ends of the transistor Q2, and a series circuit of a diode D8 and a capacitor C13 is connected between both ends of the diode D9. The diode D9 has an anode connected to the ground, and the cathode of the diode D9 is connected to the anode of the diode D8. The capacitors C12 and C13 and the diodes D8 and D9 constitute a control power supply unit 120c, and a connection point between the diode D8 and the capacitor C13 is supplied via the diode 7 as the control voltage Vcc of the discharge lamp lighting device 5e. The control power supply Vcc by the control power supply unit 120c has a function of supplying a relatively large current consumption required when the inverter control circuit 106 and the drive circuit 107 of the control circuit unit 103 are in an operating state. By being configured separately from a standby control power supply (not shown) for supplying a relatively small current consumption required during standby of the inverter control circuit 106 and the drive circuit 107, standby power consumption of the discharge lamp lighting device 5f is achieved. The purpose is to supply necessary current consumption in an operating state while suppressing power. The control power supply 120c also has a function as a snubber circuit that suppresses switching noise of the transistors Q1 and Q2.

  The output of the control power supply unit 120c rectified by the diode D5 is connected to a connection point of the diode D4, the capacitor C10, and the comparator 104 in the no-load detection circuit 109 via the resistor R19. That is, the output of the control power supply unit 120c is shunted to generate the DC voltage E2 of the oscillation voltage supply source 118e.

  Since the other configuration is the same as that of the discharge lamp lighting device 5 shown in FIG. 1, the description thereof will be omitted, and the operation of the present embodiment will be described below.

  First, the operation of turning on the discharge lamps FL1 and FL2 in the discharge lamp lighting device 5f, and the operation of not turning on or turning off the discharge lamp by detecting a failure such as a connection failure are the same as those of the discharge lamp lighting device 5 shown in FIG. Since it is the same, the description is abbreviate | omitted.

  Next, the operation of the oscillation voltage supply source 118e will be described. First, the on / off operation of the transistors Q1 and Q2 is started by the inverter control circuit 106, and before the power supply for lighting the discharge lamps FL1 and FL2 is started, the voltage applied to both ends of the transistor Q2 is approximately The voltage is 0 V, and no voltage is generated in the capacitor C13 of the control power supply unit 120c. After the on / off operation of the transistors Q1 and Q2, when the transistor Q1 is turned off, the capacitor is connected through the path of transformer T1, capacitor C1, capacitor C12, diode D8, capacitor C13, discharge lamp FL2, and discharge lamp FL1. When the charging current of C12 and C13 flows and the transistor Q2 is turned off, only the capacitor C12 is discharged through the path of the transformer T1, the discharge lamp FL1, the discharge lamp FL2, the diode D9, the capacitor C12, and the capacitor C1. That is, the control voltage Vcc of the oscillation voltage supply source 118e is generated and the DC voltage E2 of the oscillation voltage supply source 118e is generated by the charging voltage of the capacitor C13 (seventh capacitor).

  As a result, the oscillation voltage supply source 118e functions in the same manner as the oscillation voltage supply source 118 shown in FIG. 1. Therefore, the discharge lamp lighting device 5f shown in FIG. 11 and a lighting fixture using the same are shown in FIG. The same effect as the discharge lamp lighting device 5 can be obtained.

  Also, the detection power supply 115 may output the DC voltage E1 using the output of the control power supply unit 120c as in the case of the oscillation voltage supply source 118e, or may be used in the discharge lamp lighting device 5a of FIG. A configuration similar to that of the detection power source 115a may be used (see a broken line in FIG. 11).

  In addition, the preheating circuit 119b is provided with a transistor Q4 in series with the DC component cutting capacitor C6 and the preheating transformer T2, and the transistor Q4 is turned on during the period from the power-on to the start of the preheating and the period of the preheating mode. Thereafter, the transistor Q4 may be turned off, and a capacitor (not shown) may be provided at both ends of the transistor Q4 for the purpose of adjusting the preheating current during lighting in order to maintain the lamp life.

  The secondary winding 120a shown in FIG. 9, the secondary winding 120b shown in FIG. 10, and the control power supply unit 120c shown in FIG. 11 are illustrated as the supply source of the control voltage Vcc. Therefore, the secondary winding 120a, the secondary winding 120b, and the control power supply unit 120c may be used in appropriate combination.

  The oscillation voltage supply sources 118, 118a to 118e output a low level DC voltage when the power is turned on, during standby, and when stopped, and when the power supply to the discharge lamps FL1, FL2 is started, the high level is supplied. Is configured so that the detection operation by the no-load detection circuit 109 when the power is turned on is not hindered, and the lamp voltage decreases due to an abnormal load while the discharge lamps FL1 and FL2 are lit. Even when the lamp voltage is lowered due to the change in the ambient temperature, the capacitor C10 is supplied with a sufficient charging current from the voltage supply source at the time of oscillation, so the voltage of the charging voltage Vc10 is maintained at a level exceeding the reference voltage VrefN. The repetition of the intermittent oscillation described in the background art described above does not occur.

  The detection power supplies 115, 115a, and 115b also output a low-level DC voltage when the power is turned on, during standby, and when stopped, and when power supply to the discharge lamps FL1 and FL2 is started, a high-level DC voltage is output. What is necessary is just to comprise so that a voltage may be output.

1 is a circuit diagram showing a discharge lamp lighting device according to a first embodiment of the present invention. It is a perspective view which shows an example of the external appearance of a lighting fixture same as the above. It is a wave form diagram for demonstrating the operation | movement same as the above. It is a figure for demonstrating the oscillation operation | movement of an inverter same as the above. It is a circuit diagram which shows the structure of the discharge lamp lighting device which concerns on the 2nd Embodiment of this invention. It is a figure which shows the direct current | flow equivalent circuit of the discharge lamp lighting device before the oscillation operation | movement of an inverter is started. It is a circuit diagram which shows the structure of the discharge lamp lighting device by the 3rd Embodiment of this invention. It is a circuit diagram which shows the structure of the discharge lamp lighting device by the 4th Embodiment of this invention. It is a circuit diagram which shows the structure of the discharge lamp lighting device by the 5th Embodiment of this invention. It is a circuit diagram which shows the structure of the discharge lamp lighting device by the 6th Embodiment of this invention. It is a circuit diagram which shows the structure of the discharge lamp lighting device by the 7th Embodiment of this invention. It is a circuit diagram which shows the structure of the discharge lamp lighting device which concerns on background art. (A)-(h) It is a wave form diagram which shows the fluctuation | variation of the lamp voltage of the discharge lamp lighting device which concerns on background art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 5 Discharge lamp lighting device 102 Power supply part 103 Control circuit part 104,105 Comparator 108 Filament defect detection circuit 109 No-load detection circuit 115 Voltage source for detection 118 Voltage supply source at the time of oscillation FL1, FL2 Discharge lamp F1, F2, F3, F4 Filament R7 resistance (fifth resistance)
R8 to R10 resistance (second to fourth resistance)
R12 resistor (first resistor)
C8 capacitor (second capacitor)
C10 capacitor (first capacitor)
Q1, Q2 transistors

Claims (13)

A plurality of discharge lamps having a filament for lighting at both ends are configured as a series circuit of discharge lamps by connecting the filaments in series, and a reception unit that receives power supply from the outside and a power received by the reception unit The discharge lamp is equipped with a power supply unit that emits a plurality of discharge lamps by supplying a lighting voltage to the series circuit of the discharge lamp, and an abnormality detection unit that detects a defect of the filament unit connected in series A device,
The abnormality detection unit includes a no-load detection unit for detecting a defect in the filament unit connected in series when reception of external power supply is started by the reception unit, and a lighting voltage by the power supply unit A filament defect detection unit for detecting a defect of the filament part connected in series when the
The no-load detection unit is charged by a first resistor that applies a lighting voltage to a high potential side pole in the filament series circuit and a current derived from a low potential side pole in the filament series circuit. When the charging voltage of the first capacitor and the first capacitor exceeds a preset first reference voltage, power is supplied from the power supply unit to the series circuit of the discharge lamp. A first control unit that stops power supply by the power supply unit when the charging voltage is equal to or lower than the first reference voltage, and a voltage supply during oscillation that outputs a charging voltage to compensate for insufficient charging of the first capacitor With a source,
The filament defect detection unit includes a detection voltage source that outputs a detection voltage for detecting a defect in the filament unit, a series circuit including second, third, and fourth resistors that divides the detection voltage, A second capacitor connected in parallel with the fourth resistor, a fifth resistor connecting the connection point between the third and fourth resistors and the pole on the low potential side, and the second and third resistors The connection point between the resistors and the high potential side pole are connected, and the voltage generated at the connection point between the third and fourth resistors exceeds the preset second reference voltage. A second control unit for stopping the power supply by the power supply unit;
After the power supply by the power supply unit is started, in conjunction with the start of the power supply, the oscillation voltage supply source starts outputting the charging voltage, and the detection voltage source starts outputting the detection voltage. Discharge lamp lighting device characterized by being a thing. The power supply unit includes a DC voltage source that outputs a DC voltage, and a series circuit including a first switching element and a second switching element to which the DC voltage output from the DC voltage source is applied, A rectangular wave voltage output from the connection point between the first and second switching elements is supplied as a lighting voltage to the series circuit of the discharge lamp by alternately turning on and off the second switching element. Yes,
The discharge lamp lighting device according to claim 1, wherein the oscillation voltage supply source and the detection voltage source output the rectangular wave voltage as a charging voltage and a detection voltage. The power supply unit includes a DC voltage source that outputs a DC voltage, and a series circuit including a first switching element and a second switching element to which the DC voltage output from the DC voltage source is applied, A rectangular wave voltage output from the connection point between the first and second switching elements is supplied as a lighting voltage to the series circuit of the discharge lamp by alternately turning on and off the second switching element. Yes,
A series circuit including a third capacitor, a first transformer, and a third switching element connected in parallel with the second switching element;
A first secondary winding of a first transformer is connected to the high potential side pole and the low potential side pole via a fourth capacitor;
By turning on the third switching element before starting the light emission of the discharge lamp, a preheating current is output from the first secondary winding of the first transformer to the series circuit of the filament, and the light emission of the discharge lamp The discharge lamp lighting device according to claim 1, further comprising a preheating control unit that turns off the third switching element after the start.   The oscillation voltage supply source and the detection voltage source output a voltage between the third capacitor and the first transformer as a charging voltage and a detection voltage, respectively. 3. The discharge lamp lighting device according to 3. The power supply unit includes a DC voltage source that outputs a DC voltage between a positive terminal and a negative terminal, and a series circuit including a first switching element and a second switching element connected between the positive terminal and the negative terminal. By alternately turning on and off the first and second switching elements, the rectangular wave voltage output from the connection point between the first and second switching elements is converted between the fifth capacitor and the second transformer. Is supplied as a lighting voltage to the series circuit of the discharge lamp through
The first secondary winding of the second transformer is connected to the high potential side pole and the low potential side pole via a sixth capacitor,
The oscillation voltage supply source and the detection voltage source output a voltage output from the second secondary winding of the second transformer as a charging voltage and a detection voltage. The discharge lamp lighting device according to claim 1.   The discharge lamp lighting device according to claim 1, wherein the oscillation voltage supply source generates a charging voltage by diverting a control power supply of the device. The power supply unit includes a DC voltage source that outputs a DC voltage, and a series circuit including a first switching element and a second switching element to which the DC voltage output from the DC voltage source is applied, A rectangular wave voltage output from the connection point between the first and second switching elements is supplied as a lighting voltage to the series circuit of the discharge lamp by alternately turning on and off the second switching element. Yes,
A series circuit composed of a third capacitor and a first transformer connected in parallel with the second switching element;
7. The discharge lamp lighting device according to claim 6, wherein the control power supply of the device is generated by the output of the secondary winding of the first transformer. The power supply unit includes a DC voltage source that outputs a DC voltage between a positive terminal and a negative terminal, and a series circuit including a first switching element and a second switching element connected between the positive terminal and the negative terminal. By alternately turning on and off the first and second switching elements, the rectangular wave voltage output from the connection point between the first and second switching elements is converted between the fifth capacitor and the second transformer. Is supplied as a lighting voltage to the series circuit of the discharge lamp through
7. The discharge lamp lighting device according to claim 6, wherein the control power supply of the device is generated by the output of the secondary winding of the second transformer. The power supply unit includes a DC voltage source that outputs a DC voltage, and a series circuit including a first switching element and a second switching element to which the DC voltage output from the DC voltage source is applied, A rectangular wave voltage output from the connection point between the first and second switching elements is supplied as a lighting voltage to the series circuit of the discharge lamp by alternately turning on and off the second switching element. Yes,
7. The discharge lamp lighting device according to claim 6, wherein the control power source of the device is generated by a charging current of a seventh capacitor provided between both ends of the second switching element. The power supply unit includes a DC voltage source that outputs a DC voltage, and a series circuit including a first switching element and a second switching element to which the DC voltage output from the DC voltage source is applied, A rectangular wave voltage output from the connection point between the first and second switching elements is supplied as a lighting voltage to the series circuit of the discharge lamp by alternately turning on and off the second switching element. Yes,
An output of the secondary winding of the first transformer of the series circuit composed of the third capacitor and the first transformer connected in parallel with the second switching element;
The output of the secondary winding of the second transformer provided in the supply path of the rectangular wave voltage;
Of the charging current of the seventh capacitor provided between both ends of the second switching element,
7. The discharge lamp lighting device according to claim 6, wherein the control power source of the device is generated by at least two.   The second control unit of the filament defect detection unit is a voltage generated at a connection point between the third and fourth resistors within a preset period after the supply of power is received by the reception unit. The discharge lamp lighting device according to any one of claims 1 to 10, wherein the power supply is not stopped even when the voltage exceeds a second reference voltage. The first control unit of the no-load detection unit supplies power until the defect of the filament unit connected in series is eliminated when the charging voltage of the first capacitor is lower than the first reference voltage. Stop
The second control unit of the filament defect detection unit stops the power supply by the power supply unit for a predetermined period when the voltage generated at the connection point between the third and fourth resistors exceeds the second reference voltage. After the power supply, the power supply by the power supply unit is restarted, and when the power supply is stopped for a predetermined number of times, the power supply by the power supply unit is stopped until a predetermined reset operation is performed. The discharge lamp lighting device according to claim 1.   A lighting fixture comprising a discharge lamp and a discharge lamp lighting device for lighting the discharge lamp, wherein the discharge lamp lighting device is the discharge lamp lighting device according to any one of claims 1 to 12. .

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