JP4572570B2 - Discharge lamp lighting device and lighting fixture - Google Patents

Description

  The present invention relates to a discharge lamp lighting device and a lighting fixture for electronically lighting a high pressure discharge lamp.

  Conventionally, as a high pressure discharge lamp lighting device for lighting a high pressure discharge lamp (HID lamp), a copper-iron type ballast has been mainly used. However, in recent years, electronic ballasts using many electronic components aimed at reducing the weight, size, and functionality of ballasts are becoming mainstream. This electronic ballast will be briefly described below.

  FIG. 30 shows a block diagram of an electronic ballast. A DC power source circuit unit 1 including a rectifier circuit is connected to the AC power source Vs, an inverter circuit unit 2 capable of adjusting and controlling the power supplied to the discharge lamp is connected to the output end, and a discharge lamp DL is connected to the output end. Has been. The inverter circuit unit 2 converts the output of the DC power supply circuit unit 1 into a low frequency AC voltage and supplies it to the discharge lamp DL, and controls the operation of the lighting circuit unit 3 according to the state of the discharge lamp DL. And a control circuit unit 4 for performing the above.

  In such a conventional lighting device, when lighting an HID lamp having different characteristics, it is necessary to use a high-pressure discharge lamp lighting device suitable for the lamp to be lit. In other words, a dedicated high-pressure discharge lamp lighting device must be provided for each discharge lamp having different characteristics, and the investment in terms of development cost, development period, and the like was great. For these reasons, the high pressure discharge lamp lighting device has been desired to have a performance capable of lighting a plurality of types of HID lamps.

Therefore, Japanese Patent Application Laid-Open No. 2003-229289 proposes a high-pressure discharge lamp lighting device for a plurality of types of HID lamps, and integrates the time until the HID lamp exceeds a predetermined threshold to determine the load type. Means for discriminating and means for discriminating a load type by applying a transient change from the lighting device after the HID lamp reaches a stable lighting state to detect a transient response of the load are introduced.
JP 2003-229289 A

  When the conventional example of Patent Document 1 is used, in the restart mode in which the power is turned on again immediately after the lamp is turned off, the transient characteristics of the lamp are different from those at the initial start, and thus the timing at which the lamp is restarted is restricted. In addition, when a transient change is applied after the lamp has been steadily lit, there is a possibility that an excessive load is applied to the lamp and control is complicated.

  The present invention has been made in view of the above-described points, and an object of the present invention is to provide a plurality of types of lamps with the same detection / control method regardless of the lamp start state (initial start / restart). An object of the present invention is to provide a high-pressure discharge lamp lighting device that can determine the rated power type and that can be determined before the lamp is steadily lit so that the lamp can be started with less stress.

According to the present invention, in order to solve the above-described problems, a power conversion circuit that converts power from a DC power source and supplies power to a high-pressure discharge lamp, and a lighting control circuit that controls supply power of the power conversion circuit, A discharge lamp lighting device for lighting a plurality of types of high-pressure discharge lamps connected to one of them, the type of the connected high-pressure discharge lamp being a specific one of the high-pressure discharge lamp In a discharge lamp lighting device for lighting a high-pressure discharge lamp connected with a desired electrical characteristic selected based on the result of discrimination by looking at the rate of change of electrical characteristics during the period, the rate of change is the voltage of the high-pressure discharge lamp. A change in the characteristic from the first voltage to the second voltage over time is detected by a detection circuit at a constant time interval, and a value obtained by adding all the voltages detected at the constant time interval , or the constant voltage Detected voltage at time interval A value obtained by adding all the values divided by the time required to transition from a first voltage to a second voltage, or, from after the voltage characteristics of the high-pressure discharge lamp reaches the first voltage, the predetermined time period It is a value obtained by detecting all of the voltages detected at the predetermined time interval , or the voltage detected at the predetermined time interval, that is detected by the detection circuit at a constant time interval until the time elapses. It is a value obtained by dividing a value obtained by adding all of the above by the predetermined time.

  By using the high pressure discharge lamp lighting device according to the present invention, it is possible to discriminate a plurality of lamp rated power types without applying stress to the lamp, regardless of the lamp state (initial start / restart). In addition, it is possible to cope with this by simply stocking one type of high-pressure discharge lamp lighting device, and the manufacturing cost can be reduced. In addition, the user can replace the lamp according to the application.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described. Embodiments 2 and 4 correspond to the features of claims 1 and 2, and other embodiments correspond to the features of the dependent claims. Yes.
<Embodiment 1>
FIG. 1 shows a circuit diagram of a high pressure discharge lamp lighting device according to Embodiment 1 of the present invention. Hereinafter, the circuit configuration will be described. A DC power supply circuit unit 1 including a rectifying and smoothing circuit and the like is connected to the commercial AC power supply Vs. DC power supply circuit unit 1 includes a full-wave rectifier circuit composed of diodes D1 to D4, a chopper circuit that switches and boosts the full-wave rectified output, and a smoothing capacitor C1 that is charged with the boosted DC voltage. Yes. The inductor L1, the switching element Q1, and the diode D5 constitute a step-up chopper circuit. When the switching element Q1 is turned on / off at a high frequency, the input current pause period from the commercial AC power supply Vs is reduced, and the input current distortion is reduced. It has a function to improve the rate.

  The DC voltage obtained in the smoothing capacitor C1 of the DC power supply circuit unit 1 is stepped down by the step-down chopper circuit including the switching element Q2, the inductor L2, and the diode D6, and charged to the capacitor C2. The switching element Q2 is turned on / off at a high frequency, and the voltage of the capacitor C2 is made variable by variably controlling the ON width thereof, thereby constituting a current limiting element for controlling the current to the load. The inductor L2 is provided with a secondary winding, and is configured to detect that the current flowing through the inductor L2 has become zero and to turn on the switching element Q2. When the switching element Q2 is turned on for a predetermined period, the capacitor C2 is charged from the capacitor C1 via the switching element Q2 and the inductor L2. When the switching element Q2 is turned off, the accumulated energy of the inductor L2 is transferred to the capacitor C2 via the regeneration diode D6. Charged. When the regenerative current becomes zero, the switching element Q2 operates to turn on.

  A series circuit of switching elements Q3 and Q4 and a series circuit of switching elements Q5 and Q6 are connected in parallel to both ends of the capacitor C2. A high pressure discharge lamp DL is connected between the connection point of the switching elements Q3 and Q4 and the connection point of the switching elements Q5 and Q6 via the igniter circuit IG. The igniter circuit IG is a circuit that generates a high voltage pulse for causing dielectric breakdown of the high-pressure discharge lamp DL at the time of start-up, and stops its operation at the time of stable lighting. The switching elements Q3 and Q4 are controlled on / off by the microcomputer MC via the driver element IC1, and the switching elements Q5 and Q6 are controlled on / off by the microcomputer MC via the driver element IC2. The switching elements Q3 and Q6 are turned on and the switching elements Q4 and Q5 are turned off, and the switching elements Q3 and Q6 are turned off and the switching elements Q4 and Q5 are turned on alternately. AC voltage is supplied. That is, the switching elements Q3 to Q6 constitute a polarity inverting circuit (inverter circuit).

  The microcomputer MC is a control microcomputer, which controls the on / off states of the switching elements Q3 to Q6 and also controls the on width of the switching element Q2. The voltage of the capacitor C2 is divided by resistors R1, R2, and R3, and is input to the microcomputer MC as a detection value corresponding to the lamp voltage Vla. The output current from the capacitor C2 to the polarity inverting circuit is current-voltage converted by the resistor R4, and is input to the microcomputer MC as a detection value corresponding to the lamp current Ila. In order to input these detection values, the microcomputer MC has an A / D conversion function. The microcomputer MC sets a target value of the lamp power Wla to be supplied to the high-pressure discharge lamp DL based on the detected value of the lamp voltage Vla and the lamp type determination signal from the lamp type determination circuit 5, and sets the target value of the lamp power Wla. By dividing the value by the detected value of the lamp voltage Vla, the target value of the lamp current Ila is calculated, and the ON width of the switching element Q2 is variably controlled so that the detected value of the lamp current Ila matches the target value. The target value of the lamp power Wla corresponding to the detected value of the lamp voltage Vla is stored in the memory of the microcomputer as a V-W table, and based on the lamp type determination signal from the lamp type determination circuit, A V-W table corresponding to the lamp type is selected and used. However, during the lamp type determination, control is performed so that a constant current is output from the capacitor C2 to the polarity inversion circuit.

  Next, the configuration of the lamp type determination circuit 5 will be described. The voltage of the capacitor C2 is divided by resistors R1, R2, and R3, and is applied to the inverting input terminals of the comparators CP1 and CP2 as a detection value corresponding to the ramp voltage Vla. A reference voltage obtained by dividing the control power supply voltage Vcc by the resistors R5 and R6 is applied as a detection value V1 to the non-inverting input terminal of the comparator CP1. A reference voltage obtained by dividing the control power supply voltage Vcc with the resistors R7 and R8 is applied as a detection value V2 to the non-inverting input terminal of the comparator CP2. The outputs of the comparators CP1 and CP2 are open collectors, pulled up to the control power supply voltage Vcc via resistors R9 and R10, respectively, and connected to the gates of the switch elements Q7 and Q8. The switch element Q7 is connected in parallel to both ends of the capacitor C3. The switch element Q8 is connected in series with the resistor R11, and opens and closes the current flowing through the transistor Tr1. When the switch element Q8 is on, a constant current determined by the control power supply voltage Vcc and the resistor R11 flows through the transistor Tr1, and the same constant current flows through the transistor Tr2 constituting the current mirror circuit. When switch element Q7 is off, capacitor C3 is charged with a constant current. The charging voltage of the capacitor C3 is applied to the non-inverting input terminal of the comparator CP3 through a buffer circuit composed of the operational amplifier OP1. A reference voltage obtained by dividing the control power supply voltage Vcc by the resistors R12 and R13 is applied to the inverting input terminal of the comparator CP3. The output of the comparator CP3 is an open collector, and is pulled up to the control power supply voltage Vcc via the resistor R14. The output of the comparator CP3 is input to the microcomputer MC as a lamp type determination signal.

  Hereinafter, the operation of the circuit of FIG. 1 will be described. When power is supplied from the commercial AC power supply Vs, a dielectric breakdown voltage (several KV) is applied to the lamp DL in order to start the lamp DL from the igniter circuit IG. When the lamp DL breaks down and starts, the igniter circuit IG stops, and the detected value of the lamp voltage Vla is input to the lamp type determination circuit 5 via the lamp voltage detection circuit composed of the resistors R1, R2, and R3.

  In the circuit of FIG. 1, the change rate of the lamp voltage is detected using the V1 detection circuit and the V2 detection circuit of the lamp type discrimination circuit 5. The rate of change referred to here is a value obtained from the relationship in which the lamp voltage changes with time, and is represented by dV / dt = (V2−V1) / (t2−t1). It is a value that changes. The lamp voltage changes with time from immediately after lighting, and V2 and V1 are obtained by detecting the lamp voltage using a detection circuit as shown in FIG. t2 and t1 are times until the lamp voltage reaches predetermined values V2 and V1, respectively. In this embodiment, (V2−V1) becomes a fixed value by fixing V2 and V1 as detection values, and therefore, t2−t1 in the equation is derived as a variable value, that is, a change rate.

  By the way, since the detection value V1 and the detection value V2 are in a relationship of detection value V1 <detection value V2, when the lamp voltage gradually increases toward the rated lighting voltage, it first reaches the detection value V1. Then, the output of the V1 detection circuit (comparator CP1) is switched from the H level to the L level, and the switch element Q7 is turned off, so that charging of the capacitor C3 starts at the timing t1 in FIG.

  When the lamp voltage further increases and reaches the detection value V2, the output of the V2 detection circuit (comparator CP2) is switched from the H level to the L level, and the switch element Q8 is turned off. Charging to C3 stops and capacitor C3 maintains the charge that has been charged so far.

  The timing t1 to the timing t2 in FIG. 2 are the rate of change of the connected high-pressure discharge lamp DL. That is, the time for the lamp voltage to rise from the fixed value V1 to the fixed value V2 varies depending on the lamp type, and the charging voltage of the capacitor C3 also varies depending on the lamp type.

  If the voltage of the capacitor C3 does not exceed the detection value voltage of the lamp type determination circuit 5 (the voltage at the voltage dividing point of the resistors R12 and R13) between the timing t1 and the timing t2 in FIG. The microcomputer MC is determined to be a watt lamp, and the microcomputer MC controls the supply power assuming that the load is a 35 watt lamp.

  When the voltage of the capacitor C3 exceeds the detection value voltage of the lamp type determination circuit 5 (the voltage at the voltage dividing point of the resistors R12 and R13) between the timing t1 and the timing t2 in FIG. 2, the connected lamp DL is, for example, 70 watts. It is determined that the lamp is a lamp, and the microcomputer MC controls the power supply on the assumption that the load is a 70-watt lamp.

Hereinafter, the lamp type determination will be described in detail with reference to FIGS.
Fig. 3 shows the lamp voltage rise characteristic from the state where the lamp is completely cooled (first start) and the lamp that has been lit once turned off and then turned on again for one type of 70W lamp among various HID lamps on the market. This is a comparison of the ramp voltage rise characteristics after restart (the lamp is warm). In the restart of FIG. 3, the power is turned on again after 10 seconds after the lamp is turned off. The lamp shown in FIG. 3 had the same rising characteristics as the initial start 30 minutes after the lamp was turned off. From this figure, it can be seen that when the lamp voltage is at least 30 V, the same rising characteristics are traced regardless of the initial start / restart. (The initial start / restart relationship is the same for all other lamps.)

  FIG. 4 shows the emission spectrum of the 70W metal halide lamp at the initial start and FIG. 5 at the time of restart. The horizontal axis indicates the elapsed time [seconds] after starting, and the vertical axis indicates the wavelength λ [nm] of the emission spectrum. In the spectrum of FIG. 4, it can be seen that Hg (mercury) is the main light emitting component from the start of the lamp to about 80 seconds. In the spectrum of FIG. 5, it can be seen that Hg (mercury) is the main light emitting component from the start of the lamp to about 40 seconds.

  In FIG. 3, about 80 seconds for the initial start and about 40 seconds for the restart are regions where the slope of the lamp voltage changes, and the behavior of the lamp voltage in this region varies greatly depending on the lamp to be measured and the surrounding environment. . Accordingly, the detection values V1 and V2 shown in FIG. 1 can be detected in a stable inclination by setting the detection values V1 and V2 in a region where mercury (Hg) is a main light emission component.

  6 and 7 are diagrams comparing a type of 35 W lamp among various HID lamps on the market and the previous 70 W lamp, divided into initial start and restart, respectively, and the mercury described above is the main light emission. It can be seen that there is a difference in the slope of the ramp voltage rise in the component region.

  FIG. 8 shows a graph in which the portion of 30 to 40 V is extracted from the rising characteristic data of the 35 W and 70 W lamps while the lamp voltage is rising. From this figure, it can be seen that the slope of the voltage increase between the 35 W lamp and the 70 W lamp is almost linear from at least 30 V to around 50 V, and the difference is clear.

  As an example so far, one type of 35W and 70W lamps have been described from various HID lamps in the market, but the types shown in Table 1 are sold in the market of at least 35W and 70W HID lamps.

  FIG. 9 and FIG. 10 show the measured lamp voltage rise characteristics at the time of initial start / restart for the 35 W and 70 W lamps that can be obtained. FIG. 11 shows an example in which a portion of 30 to 40 V is extracted from the result of further increasing the number of measurements as an example. In FIG. 11, the solid line is the characteristic at the time of restart, and the broken line is the characteristic at the time of initial start. From this result, it can be seen that there is a difference of at least 2 seconds in the lamp voltage increase characteristics in the portion of 30 to 40 V between the 35 W HID lamp and the 70 W HID lamp.

  Based on the contents described above, the method of obtaining the rate of change at the time of rising of the lamps connected using the V1 detection circuit and the V2 detection circuit of FIG. By determining the lamp type at the lamp voltage rising tendency part where the slopes of the initial start and restart are equal, it is possible to reliably determine the lamp type that is loaded regardless of the lamp status (initial start / restart). It is possible to realize a high pressure discharge lamp lighting device capable of lighting a HID lamp loaded with desired power characteristics.

  In this embodiment, as the detection values V1 and V2 in FIG. 1, the ramp voltage rising characteristics from 30 V to 40 V of each lamp shown in FIG. 11 are detected, and the lamp type determination circuit 5 charges the capacitor C3 for 6 seconds or more. Is set to a value determined to be 70W.

<Embodiment 2>
FIG. 12 shows the second embodiment. In the first embodiment, the lamp type is determined by detecting the lamp voltage from V1 to V2, and comparing the required time t at that time as the rate of change to determine the lamp type. Similarly, in the second embodiment, other change rates are compared using detection of the lamp voltage V1 to V2.

The equation dV / dt = (V2−V1) / (t2−t1) described in the first embodiment can be expressed as (V _t −V _t−1 ) / {t− (t−1)}. That is, the value obtained by subtracting the lamp voltage V _t-1 at the previous timing from the lamp voltage V _{t at} a certain timing t and dividing by the required time {t− (t−1)} can be added from V1 to V2. For example, a value reflecting the slope dV / dt from V1 to V2 can be calculated. Of course, if the added value is divided by the time (t2-t1) required for the lamp voltage to reach from V1 to V2, a value reflecting the slope dV / dt from V1 to V2 can be calculated more accurately.

Further, even if the subtraction of (V _t −V _t−1 ) is not executed every time, dV / dt is reflected simply by adding the lamp voltage V _t until the lamp voltage reaches V2 from V1. It is possible to calculate the value, which can be done with a simple calculation.

  Therefore, by defining a function Vla (t) as a function representing the lamp voltage Vla at time t, a value obtained by adding it to time can be represented as ΣVla (t). That is, in FIG. 12, a value ΣVla (t) obtained by adding ramp voltages from V1 to V2 at regular intervals can be compared as a change rate.

  Note that the rise characteristics of the lamp voltage are as described in the first embodiment, and the second embodiment also obtains the rate of change of the lamp voltage in the lamp voltage rising region where mercury (Hg) is the main light emitting component. Determine the lamp type.

  By providing the above lamp type discriminating means, it is possible to reliably determine the lamp type that is loaded regardless of the lamp state (initial start / restart), and to light the HID lamp that is loaded with the desired power characteristics. A high pressure discharge lamp lighting device can be realized.

As a configuration of the lighting device, in FIG. 1, the lamp type discriminating circuit 5 is omitted, and the microcomputer MC is used to calculate an integrated value obtained by adding the lamp voltage from V1 to V2 at regular intervals. By determining whether it is large or small, it is possible to distinguish between the lamp type A and the lamp type B in FIG. In the example of FIG. 12, for the lamp type A, the integrated value S _A is the detected value Vla (r) of the lamp voltage Vla from the time tA _V1 when the lamp voltage Vla reaches _V1 to the time tA _V2 when the lamp voltage Vla reaches V2. It is an integrated value obtained by adding t) at regular intervals. Further, the integrated value S _B is a constant value of the detected value Vla (t) of the lamp voltage Vla from the time tB _V1 when the lamp voltage Vla reaches _V1 to the time tB _V2 when the lamp voltage Vla reaches V2 for the lamp type B. The integrated value added at intervals. The fixed interval to be added may be determined by an interrupt timer of the microcomputer MC. _A reference value is set in advance between the integrated values S _A and S _{B. If} the calculated integrated value is smaller than the reference value, the lamp type A is determined. If the calculated integrated value is larger than the reference value, the lamp type B is determined. Can be determined.

<Embodiment 3>
FIG. 13 shows a circuit diagram of a high pressure discharge lamp lighting device according to Embodiment 3. Compared with the lighting device of FIG. 1, the step-down chopper circuit including the switching element Q2, the diode D6, the inductor L2, and the capacitor C2 is omitted, and the switching elements Q3 and Q4 are alternately turned on and off at a low frequency during stable lighting. In addition, the switching element Q6 is switched when the switching element Q3 is turned on, and the switching element Q5 is switched at a high frequency when the switching element Q4 is turned on, thereby realizing the function of the step-down chopper circuit.

  Further, the igniter circuit IG in the lighting device of FIG. 1 is omitted, and a starting pulse generation circuit including an LC series resonance circuit of an inductor L3 and a capacitor C3 is added instead. The igniter circuit IG in FIG. 1 is a combination of a pulse generation circuit and a pulse transformer. At the start, a pulse voltage is generated by the pulse generation circuit, which is boosted by the pulse transformer and applied to the high pressure discharge lamp DL. However, in the lighting device of FIG. 13, a high voltage pulse for starting is generated by the resonance action of the inductor L3 and the capacitor C3.

  When AC power supply Vs is supplied, in order to start discharge lamp DL, switching elements Q3 and Q4 are alternately turned on and off at a fixed or variable frequency of several tens KHz to several hundreds KHz, and are composed of inductor L3 and capacitor C3. A lamp breakdown voltage (several KV) is generated from the resonance circuit to break down the discharge lamp DL. Thus, when the discharge lamp DL is lit, the microcomputer MC detects that the lamp current Ila has started to flow, and switches from the operation at the start to the operation at the time of lighting. At the time of lighting, the switching elements Q3 and Q4 are alternately turned on / off at a low frequency of several tens to several hundreds Hz, so that the resonance circuit composed of the inductor L3 and the capacitor C3 does not generate a dielectric breakdown voltage.

  During lighting, when the switching element Q3 is on and the switching element Q4 is off, the switching element Q5 remains off and the switching element Q6 is turned on and off at a high frequency, so that the low-pass filter including the inductor L2 and the capacitor C2 has a high frequency. The intermittent chopping current flows in FIG. 2, and the high frequency component is bypassed to the capacitor C2, so that a direct current flows in one direction in the discharge lamp DL. Further, in a period in which the switching element Q3 is off and the switching element Q4 is on, the switching element Q6 remains off and the switching element Q5 is turned on and off at a high frequency, so that the low-pass filter including the inductor L2 and the capacitor C2 has a high frequency. Intermittent chopping current flows and the high frequency component is bypassed to the capacitor C2, so that a direct current flows in the discharge lamp DL in the opposite direction. By repeating this operation, a low-frequency rectangular wave current flows through the discharge lamp DL.

  The function of the regenerative diode D6 in the lighting device of FIG. 1 is shared by the reverse diodes of the switching elements Q5 and Q6 in the lighting device of FIG. 13, and is stored in the inductor L2 when the switching element Q5 is turned on. The energy is released through the reverse diode of the switching element Q6 when the switching element Q5 is turned off, and the energy stored in the inductor L2 when the switching element Q6 is turned on passes through the reverse diode of the switching element Q5 when the switching element Q6 is turned off. Released. The triangular wave current flowing through the inductor L2 is detected by the secondary winding of the inductor L2, and when the zero cross detection (ZCS detection in the figure) circuit detects that the regenerative current has become zero, switching for the chopper It operates to turn on elements Q5 and Q6. The on widths of the chopper switching elements Q5 and Q6 are variably controlled by the microcomputer MC, whereby the power supplied to the discharge lamp DL can be controlled. However, during lamp type discrimination, control is performed so that a constant current is output to the discharge lamp DL.

  In FIG. 13, the lamp voltage detection circuit (Vla detection circuit) and the lamp current detection circuit (Ila detection circuit) are simplified, but the A / D conversion input terminal of the microcomputer MC is similar to the lighting device of FIG. Needless to say, a detection value corresponding to the lamp voltage and a detection value corresponding to the lamp current are input.

  When the discharge lamp DL is turned on, lamp voltage information is acquired at regular intervals by the microcomputer MC via the lamp voltage detection circuit. Specifically, by using the timer interrupt function of the microcomputer MC or the like, the voltage of the A / D conversion input terminal is read at regular intervals, and is input from the lamp voltage detection circuit to the A / D conversion input terminal of the microcomputer MC. A detection value corresponding to the lamp voltage is acquired as lamp voltage information.

  In the microcomputer MC, as shown in FIG. 14, when the lamp voltage Vla reaches a certain voltage Vla1, a timer for counting a certain time T2 is started therefrom, and the lamp at the time when this timer finishes counting the certain time T2 is started. Read the value of voltage V2 '. In FIG. 14, the lamp voltage V2 'after the elapse of the predetermined time T2 is Vfb35 for a 35 W lamp and Vfb70 for a 70 W lamp.

  The rise characteristics of the lamp voltage are as described in the first embodiment. In the third embodiment as well, the lamp voltage change rate in the lamp voltage rising region in which mercury (Hg) is the main light emission component is obtained. Is determined.

  The rate of change referred to here is that the lamp voltage changes with time, and the relationship can be expressed by the equation dV / dt = (V2′−V1) / (t2−t1). In the third embodiment, since V1 = Vla1 and t2-t1 = T2 are fixed, V2 'is a changing value. Note that t1 is the time of the lamp voltage Vla = V1 and is common to all the lamps, so it is replaced with 0. That is, since only V2 '= Vfb35 or V2' = Vfb70 is a variable value, this is the rate of change.

  Using FIG. 8 again, for example, if Vla1 = 30V and T2 = 4 seconds, the lamp voltage of the 35W lamp is V2 ′ = 40V after 4 seconds from 30V, and the lamp voltage of the 70W lamp is V2 after 4 seconds from 30V. Since “= 32 to 33V”, it is possible to determine the type of lamp by determining that the lamp is a 35 W lamp when V2 ′ ≧ 36V and a 70 W lamp when V2 ′ <36V.

  When the lamp type is determined, the V-W table suitable for the lamp is referred from the memory of the microcomputer MC, and switching elements Q5 and Q6 for the chopper are supplied so that appropriate lamp power is supplied according to the lamp voltage. The ON width is controlled variably. Specifically, the target value of lamp power is read from the V-W table based on the lamp voltage, and the target value of lamp current is calculated by dividing the target value of lamp power by the detected value of lamp voltage. The ON widths of the chopper switching elements Q5 and Q6 are variably controlled so that the detected value of the lamp current matches the target value of the lamp current.

  The detection time T2 is set such that the time within the Hg main light emission region including the lamp type with the faster rise, the time with only the slower lamp type within the Hg main light emission region, and all the lamps loaded. It can also be set according to the type of lamp suitable as a load, such as the time after the seed leaves the Hg main light emitting region.

  By providing the above lamp type discriminating means, it is possible to reliably determine the lamp type that is loaded regardless of the lamp state (initial start / restart), and to light the HID lamp that is loaded with the desired power characteristics. A high pressure discharge lamp lighting device can be realized.

<Embodiment 4>
FIG. 15 shows a fourth embodiment. In the third embodiment, the lamp type is determined by comparing the voltage V2 ′ when the time T2 has elapsed after the lamp voltage reaches V1 as the rate of change. In the fourth embodiment, other change rates are similarly compared using the detection of V1 and T2.

The equation dV / dt = (V2′−V1) / T2 described in the third embodiment can be expressed as (V _t −V _t−1 ) / {t− (t−1)}. That is, a period of by subtracting the lamp voltage V _t-1 of the previous timing from the lamp voltage V _t at a certain timing t divided by the its duration {t- (t-1)} from V1 T2, If they are added together, a value reflecting the slope dV / dt from V1 to V2 ′ can be calculated. Of course, if the added value is divided by the time T2 required for the lamp voltage to reach from V1 to V2 ′, an arithmetic average of the slopes dV / dt from V1 to V2 ′ can be calculated. Then, since the time T2 is common to each lamp, it is not necessary to divide.

Further, even if the subtraction of (V _t −V _t−1 ) is not executed every time, the slope from V 1 to V 2 ′ can be obtained simply by adding the ramp voltage V _t during the period from the ramp voltage V 1 to T 2. It is possible to calculate a value reflecting dV / dt, which can be done with simpler calculation.

  Therefore, by defining a function Vla (t) as a function representing the lamp voltage Vla at time t, a value obtained by adding it to time can be represented as ΣVla (t). That is, in FIG. 15, it is possible to compare the value ΣVla (t) obtained by adding the lamp voltage at regular intervals as the rate of change during the period T2 after the lamp voltage reaches V1.

  Note that the rise characteristics of the lamp voltage are as described in the first embodiment, and the fourth embodiment also obtains the rate of change of the lamp voltage in the lamp voltage rising region where mercury (Hg) is the main light emitting component. Determine the lamp type.

  By providing the above lamp type discriminating means, it is possible to reliably determine the lamp type that is loaded regardless of the lamp state (initial start / restart), and to light the HID lamp that is loaded with the desired power characteristics. A high pressure discharge lamp lighting device can be realized.

As a configuration of the lighting device, in FIG. 13, the microcomputer MC is used to calculate an integrated value obtained by adding the lamp voltage at a constant interval during the period T2 after the lamp voltage reaches V1, and whether it is larger or smaller than the reference value. Thus, it is possible to discriminate between the lamp type A and the lamp type B in FIG. In the example of FIG. 15, for the lamp type A, the integrated value S _A is an integrated value obtained by adding the detected value Vla (t) of the lamp voltage Vla at regular intervals during the period from the time tA _V1 to the time T2 when the lamp voltage Vla reaches V1. Value. Further, the integrated value S _B is the lamp type B, and an integrated value the lamp voltage Vla is obtained by adding a period of time tB _V1 from T2 has been reached V1, the detection value of the lamp voltage Vla Vla a (t) at regular intervals. The fixed interval to be added may be determined by an interrupt timer of the microcomputer MC. _A reference value is set in advance between the integrated values S _A and S _{B. If} the calculated integrated value is smaller than the reference value, the lamp type B is determined. If the calculated integrated value is larger than the reference value, the lamp type A is determined. Can be determined.

<Embodiment 5>
FIG. 16 shows the fifth embodiment. Compared with the lighting device of FIG. 1, the step-down chopper circuit composed of the switching element Q2, the diode D6, the inductor L2, and the capacitor C2 is omitted, and during stable lighting, the switching element Q5 is switched at a high frequency and the switching element Q6. A difference is that the function of the step-down chopper circuit is realized by alternating the period in which the frequency is switched at a high frequency with a low frequency. Another difference is that a series circuit of smoothing capacitors C1 and C2 is connected to the output of the step-up chopper circuit instead of the series circuit of switching elements Q3 and Q4. That is, the difference is that the configuration of the inverter circuit is not a full bridge type but a half bridge type.

  The inductor L2 and the capacitor C3 constitute a low-pass filter of the step-down chopper circuit. When the switching element Q5 is turned on / off at a high frequency, a chopping current intermittently flows at a high frequency through a low-pass filter composed of an inductor L2 and a capacitor C3, and the high-frequency component is bypassed to the capacitor C3. DC current flows through Further, when the switching element Q6 is turned on / off at a high frequency, a chopping current intermittently flows at a high frequency through a low-pass filter composed of an inductor L2 and a capacitor C3, and the high-frequency component is bypassed to the capacitor C3. A direct current flows in the opposite direction to the above. By repeating this operation, a low-frequency rectangular wave current flows through the discharge lamp DL.

  Further, the function of the regenerative diode D6 in the lighting device of FIG. 1 is shared by the reverse diodes of the switching elements Q5 and Q6 in the lighting device of FIG. 16, and is stored in the inductor L2 when the switching element Q5 is turned on. The energy is released through the reverse diode of the switching element Q6 when the switching element Q5 is turned off, and the energy stored in the inductor L2 when the switching element Q6 is turned on passes through the reverse diode of the switching element Q5 when the switching element Q6 is turned off. Released. When the triangular wave current flowing through the inductor L2 is detected by the secondary winding of the inductor L2, and the zero cross detection (ZCS detection in the figure) circuit detects that the regenerative current has become zero, the switching element for the chopper It operates to turn on Q5 and Q6. The on widths of the chopper switching elements Q5 and Q6 are variably controlled by the microcomputer MC, whereby the power supplied to the discharge lamp DL can be controlled. However, during lamp type discrimination, control is performed so that a constant current is output to the discharge lamp DL.

  Although the illustration of the lamp voltage detection circuit (Vla detection circuit) is simplified in FIG. 16, the detection value corresponding to the lamp voltage can be acquired by the microcomputer MC as in the lighting device of FIG. 1. Needless to say. Specifically, for example, a first voltage dividing resistor is connected between one end of the discharge lamp DL and the ground, and the voltage at the voltage dividing point is input to the first A / D conversion input terminal of the microcomputer MC. A / D conversion is performed. A second voltage dividing resistor is connected between the other end of the discharge lamp DL and the ground, and the voltage at the voltage dividing point is input to the second A / D conversion input terminal of the microcomputer MC to perform A / D conversion. To do. If the absolute value of the difference between the two A / D-converted data is calculated, it becomes the detected value of the lamp voltage Vla of the discharge lamp DL.

  As the lamp current detection circuit (Ila detection circuit), the lamp current Ila can be detected by using the secondary winding output of the inductor L2 in the zero cross detection (ZCS detection in the figure) circuit. The secondary winding output of the inductor L2 is a triangular wave voltage. When the switching elements Q5 and Q6 are turned on, the absolute value gradually increases. When the switching elements Q5 and Q6 are off, the absolute value gradually decreases. The average value or peak value can be used as the detected value of the lamp current Ila.

  When power is supplied from the commercial AC power supply Vs, a dielectric breakdown voltage (several KV) is applied to the discharge lamp DL in order to start the discharge lamp DL from the igniter circuit IG. The igniter circuit IG is a combination of a pulse generation circuit and a pulse transformer. A pulse voltage is generated by the pulse generation circuit at start-up, and a high voltage pulse boosted by the pulse transformer is supplied to the discharge lamp DL via the capacitor C3. Applied to both ends. When the discharge lamp DL breaks down and starts, the igniter circuit IG stops the pulse generation operation. Thereafter, lamp voltage information is transmitted to the microcomputer MC via the lamp voltage detection circuit (Vla detection circuit) described above.

  In this embodiment, the first lamp type determination using any of the change rate calculation methods described in Embodiments 1 to 4, and the value of the lowest point of the lamp voltage that passes immediately after the lamp is turned on. A procedure for determining the lamp type by using together with the second lamp type determination using the above will be described. FIG. 17 is a diagram for explaining the principle of lamp type discrimination, and FIG. 18 is a flowchart of lamp type discrimination.

Immediately after the lighting of the lamp DL is determined, the microcomputer detects the lowest voltage V _L before the lamp voltage in the Hg main light emitting area rises through the Vla detection circuit. In FIG. 17, lamp A is detected as the lowest voltage V _LA , lamp B as the lowest voltage V _LB , and lamp C as the lowest voltage V _LC . When the minimum voltage V _L is detected, the microcomputer stores the value (step # 1 in FIG. 18).

  Next, lamp type discrimination using any of the change rates described in the first to fourth embodiments is performed. For example, when the lamp type determination of the first embodiment is performed, the time for the lamp voltage to reach the detection value V1 and the time for the detection voltage V2 to reach the detection value V2 are stored in registers in the microcomputer as tv1 and tv2, respectively (step in FIG. 18). # 2, # 3). Thereafter, the time required for the lamp voltage to reach from V1 to V2 is calculated as t = tv2-tv1, and compared with the determination reference time Tk (steps # 4 and # 5 in FIG. 18).

  For example, when the lamp connected to the high-pressure discharge lamp lighting device rises with the lamp voltage characteristics of the lamp types A, B, and C in FIG. 17, the determination reference time Tk is set so that tA≈tC <Tk <tB. Here, tA is the time required for the lamp type A to reach the lamp voltage from V1 to V2, tB is the time required for the lamp type B to reach the lamp voltage from V1 to V2, and tC is the lamp voltage for the lamp type C. This is the time required to reach V2 from V1.

  If the connected lamp type is lamp C, YES is determined in lamp group discrimination (step # 5 in FIG. 18). (Note that the determination based on the detection value Vla1 and the detection time T2 of the third embodiment may be used for the distribution of the lamp groups A and B. In this case, in step # 5, instead of the determination reference time Tk, (The determination is made based on the value of the ramp voltage V2 ′ at the end of the count of the detection time T2.)

Next, after the power is turned on, the time tv1 until the lamp voltage reaches the detection value V1 is compared with the determination value ts to determine whether the engine is initially started or restarted (steps # 8 and # 9 in FIG. 18). In the case of FIG. 17, since tv1 = ts, it is determined that the engine is started for the first time, so that V _LC stores the value in V _LM (step # 10 in FIG. 18).

Here, it should be noted that the determination value ts needs to be set in consideration of variations in lamp types. In the example of FIG. 18, the determination values tsA and tsB are properly used for the lamp type A group and the B group. When the measurement data is restarted, the time tv1 until the lamp voltage reaches V1 becomes shorter than the determination value ts, and a value obtained by copying the value already stored in the _VLM from the previous time to the _VL is obtained again. The lamp type is determined by comparison with the determination value V _LK .

Finally, in the lamp type discrimination (steps # 14 and # 15 in FIG. 18), the lowest voltage V _L detected from the characteristics of the lamp voltage at the initial start is compared with the discrimination value V _LK . In this example, the minimum voltage V _L is V _LC , and this voltage is V _LC > V _LK in FIG. 17, so that the loaded lamp type is determined to be lamp C.

  When the lamp type is determined, the V-W table suitable for the lamp is referred from the memory of the microcomputer MC, and switching elements Q5 and Q6 for the chopper are supplied so that appropriate lamp power is supplied according to the lamp voltage. The ON width is controlled variably. Specifically, the target value of lamp power is read from the V-W table based on the lamp voltage, and the target value of lamp current is calculated by dividing the target value of lamp power by the detected value of lamp voltage. The ON widths of the chopper switching elements Q5 and Q6 are variably controlled so that the detected value of the lamp current matches the target value of the lamp current.

  By providing the above lamp type discriminating means, it is possible to reliably determine the lamp type that is loaded regardless of the lamp state (initial start / restart), and to light the HID lamp that is loaded with the desired power characteristics. A high pressure discharge lamp lighting device can be realized.

<Embodiment 6>
FIG. 19 shows a sixth embodiment. The configuration of the igniter circuit IG that generates a high voltage (several KV) in order to cause dielectric breakdown of the load lamp in a no-load state before the lamp is lit is substantially the same as the circuit configuration shown in FIG. Instead of the LC series resonance circuit, a high voltage pulse generation circuit combining a pulse transformer and a pulse generation circuit is used. Further, in order to detect the lamp voltage Vla, the terminal voltage of the discharge lamp DL is detected via the polarity distribution means, and the terminal on the non-ground side of the discharge lamp DL is switched each time the voltage polarity of the discharge lamp DL is switched. To detect a voltage corresponding to the lamp voltage.

  At the time of stable lighting, the switching elements Q3 and Q4 are alternately turned on / off at a low frequency, the switching element Q6 is switched at a high frequency when the switching element Q3 is on, and the switching element Q5 is switched at a high frequency when the switching element Q4 is on. Thus, the function of the step-down chopper circuit is realized as in FIG. However, in the circuit of FIG. 19, since there is no LC series resonance circuit of the inductor L3 and the capacitor C3, the switching elements Q3, Q4 may be turned on / off at a high frequency in synchronization with the on / off of the switching elements Q5, Q6. There is no difference. In contrast to the circuit of FIG. 13, the switching elements Q5 and Q6 are alternately turned on / off at a low frequency, the switching element Q4 is turned on when the switching element Q5 is turned on, and the switching element Q3 is turned on when the switching element Q6 is turned on. The function of the step-down chopper circuit may be realized by switching at a high frequency.

  In addition, you may use the circuit of FIG.1, FIG.13, FIG.16 and FIG. 19 as a lighting device of any embodiment.

  When the AC power supply Vs is supplied, a dielectric breakdown voltage (several KV) is applied to the discharge lamp DL in order to start the discharge lamp DL from the igniter circuit IG. When the discharge lamp DL breaks down and starts, the igniter circuit IG stops and lamp power information is transmitted to the microcomputer MC via the Wla detection circuit.

  Next, in the same manner as in any of the first to fourth embodiments, however, instead of the lamp voltage, the lamp power using the detected value of the lamp power Wla obtained by multiplying the detected value of the lamp voltage Vla and the detected value of the lamp current Ila. In the rising characteristic, a first change rate is calculated, and the type of lamp connected is determined using the first change rate.

  Further, the second rate of change is calculated using the third detection value at the subsequent timing after the lamp voltage reaches V2. The second rate of change may be calculated by applying the rate of change described in the first or second embodiment to a range where the lamp voltage is V2 to V3 (where V1 <V2 <V3). Then, the calculation of the change rate described in the third or fourth embodiment may be applied to the lamp voltage V3 ′ after a certain time T3 from V2. Here, the second change rate is described using the detection value Wla of the lamp power detection circuit, but the detection value Vla of the lamp voltage detection circuit may be used.

  FIG. 20 is an explanatory diagram of the principle of lamp type discrimination. As the first rate of change, the lamp type is discriminated using the lamp power after a certain time T2 has elapsed after the lamp power reaches Wla1, and the second change. As the rate, the lamp type discrimination result is confirmed using the power difference after elapse of t3 hours after the power is turned on. The first rate of change is detected at a timing within the Hg main light emitting region, and the second rate of change is detected at a timing outside the Hg main light emitting region. If the lamp is a 35 watt lamp, the lamp power after a certain time T2 has elapsed after the lamp power has reached Wla1 is Wfb35. If the lamp is a 70 watt lamp, the lamp power has been a certain time T2 after the lamp power has reached Wla1. When the lamp power is Wfb70, it is possible to determine which wattage of the lamp is connected. Furthermore, it is confirmed whether the lamp type discrimination based on the first rate of change is correct by detecting whether or not the power after the elapse of time t3 exceeds the judgment reference power W3 after the power is turned on. Thereafter, the lighting control circuit is switched from constant current control to constant power control, and lamp power corresponding to the determined wattage of the lamp type is supplied.

  By providing the lamp type discriminating means using the above first and second rate of change, the lamp type that is loaded is reliably discriminated regardless of the lamp state (initial start / restart), and the desired power It is possible to realize a high pressure discharge lamp lighting device capable of lighting an HID lamp loaded with characteristics.

<Embodiment 7>
21 and 22 show the seventh embodiment. As shown in FIG. 21, the means for discriminating the lamp type by looking at the rate of change in the first to fourth embodiments uses four detection values V1, V2, V3, and V4 (where V1 <V2 <V3 <V4). It is also possible to calculate the two change rates by detecting that the lamp voltage passes through these detection values. In that case, any of the first to fourth embodiments may be combined with the detection of the first stage and the second stage.

  As an example, the required time δt = t2-t1 from the lamp voltage V1 to V2 is the first rate of change, and the required time Δt = t4-t3 from the lamp voltage V3 to V4 is the second rate of change. FIG. 21 shows an example of determining the lamp type by using the first and second change rates together. In the figure, δt and Δt are the first and second change rates for the 35 W lamp, δt ′ and Δt ′ are the first and second change rates for the 70 W lamp, and (δt + δt ′) / 2 is set in advance. By setting 1 determination reference value, (Δt + Δt ′) / 2 as the second determination reference value, the first change rate is smaller than the first determination reference value, and the second change rate is set. Is smaller than the second determination reference value, it can be reliably determined that the lamp is a 35 W lamp. Further, if the first change rate is larger than the first determination reference value and the second change rate is larger than the second determination reference value, it can be reliably determined that the lamp is a 70 W lamp. When the first change rate is smaller than the first determination reference value and the second change rate is larger than the second determination reference value, or the first change rate is lower than the first determination reference value. If the second change rate is smaller than the second determination reference value, it can be determined that an unexpected lamp is connected. Therefore, it is determined that the load is abnormal, and the power supply is stopped or reduced. Just do it.

  Further, the required time δt = t2-t1 from the lamp voltage V1 to V2 is set as the first rate of change, and the lamp voltage after a certain time T2 after the lamp voltage reaches V3 is set as the second rate of change. FIG. 22 shows an example in which the lamp type is determined by using the first and second change rates together. In the figure, δt is the time required for the 35 W lamp to reach V2 after the lamp voltage reaches V1, and δt ′ is the time required for the 70 W lamp to reach V2 after the lamp voltage reaches V1. Vfb35 is a value obtained by measuring the lamp voltage after a certain time T2 after the lamp voltage reaches V3 with respect to the 35 W lamp, and Vfb70 is obtained by measuring the lamp voltage after a certain time T2 after the lamp voltage reaches V3 with respect to the 70 W lamp. Value. By setting (δt + δt ′) / 2 as the first determination reference value and (Vfb35 + Vfb70) / 2 as the second determination reference value in advance, the first rate of change δt is greater than the first determination reference value. If it is small and the second change rate Vfb35 is larger than the second determination reference value, it can be reliably determined that the lamp is a 35 W lamp. Further, if the first change rate δt ′ is larger than the first determination reference value and the second change rate Vfb70 is smaller than the second determination reference value, it can be reliably determined that the lamp is a 70 W lamp. When the first rate of change is smaller than the first criterion value and the second rate of change is smaller than the second criterion value, or when the first rate of change is smaller than the first criterion value. If the second rate of change is larger than the second determination reference value, it can be determined that an unexpected lamp is connected, so it is determined that the load is abnormal, and the power supply is stopped or reduced. Just do it.

  By providing the lamp type discriminating means using the first and second rate of change, the lamp type that is loaded reliably can be discriminated regardless of the lamp state (initial start / restart), and the desired It is possible to realize a high pressure discharge lamp lighting device capable of lighting an HID lamp loaded with power characteristics.

<Eighth embodiment>
FIG. 23 shows an eighth embodiment. FIG. 23 is a diagram for explaining three regions that can be detected with respect to the lamp voltage rising characteristic at the time of starting the lamp. Hereinafter, three elements in the figure will be described.

As the lamp type determination element 1, the lowest voltage V _L through which the lamp voltage described in the fifth embodiment passes is detected to determine the lamp type. Here, the detection values of the minimum voltage V _{LA for} the lamp A, the minimum voltage V _{LB for} the lamp B, and the minimum voltage V _LC for the lamp C are obtained.

  As the lamp type discriminating element 2, the lamp type is discriminated based on the rate of change shown in any of the first to fourth embodiments. Here, for each of the lamps A, B, and C, detection values of required times tA, tB, and tC from when the lamp voltage reaches V1 to V2 are obtained.

  As the lamp type discriminating element 3, a measurement timing t3 (within 100 to 200 seconds from power-on) is set outside the Hg main light emission region, and a lamp type is discriminated by detecting a voltage difference at the measurement timing t3.

  When the above three elements are limited in lamp type connected to the high-pressure discharge lamp lighting device, the lamp is configured by any combination including at least the lamp type discriminating element 2 according to the target lamp type. Regardless of the state (initial start / restart), it is possible to realize a high-pressure discharge lamp lighting device that can reliably determine the type of lamp that is loaded and light the HID lamp loaded with the desired power characteristics It becomes.

<Embodiment 9>
FIG. 24 is a diagram for explaining the principle of the ninth embodiment. In the high-pressure discharge lamp lighting device that determines the lamp type by detecting the change rate of the lamp voltage or lamp power as in the first to fourth embodiments, the value affected by the instantaneous noise as illustrated in FIG. Provided is a means for preventing erroneous detection of a lamp type even when a lamp voltage detection circuit or a lamp power detection circuit is transmitted to a lighting control circuit. As described in the first embodiment, when calculating the rate of change from the time point t1 when the lamp voltage reaches V1 to the time point t2 when it reaches V2, the equation dV / dt = (V2−V1) / (t2−t1). , V2, V1, and t1 are fixed values, so that t2 is a changing value. That is, when the lamp voltage reaches the detection value V1, the timer starts counting, and when the lamp voltage reaches the detection value V2, the timer count ends and the timer count value is detected as the rate of change. However, when instantaneous noise as shown in FIG. 25 is detected, t2−t1 becomes a very small value, and the rate of change dV / dt becomes a very large value. This is illustrated in FIG. That is, even if the connected lamp is a 70 W lamp, if instantaneous noise is detected, the timer count value (t2−t1) is smaller than the lamp type determination value (thick broken line in FIG. 24), and thus the 35 W There is a risk of erroneously determining that the lamp is a lamp.

  Therefore, among all types of lamps connected to the lighting device, the time from when the lamp voltage reaches V1 until it reaches V2 is shorter than the shortest, that is, the rate of change dV / dt is larger than the maximum. When the value is detected as the rate of change, as shown in FIG. 24, this is regarded as instantaneous noise and ignored, and the process waits for the lamp voltage to reach V1 again. Thereby, erroneous determination of the lamp type due to instantaneous noise can be prevented.

  Further, when the lamp voltage after a certain time T2 after the lamp voltage reaches V1 is obtained as the rate of change as in the third embodiment, the lamp voltage exceeds the detected value V1 due to instantaneous noise as shown in FIG. In this case, the correct lamp type cannot be determined even if the lamp voltage is obtained after a certain time T2 has elapsed from that point. Therefore, a voltage Vx for instantaneous noise detection is set in advance. When it is detected that the voltage Vx has exceeded the voltage Vx for instantaneous noise detection after the lamp voltage has exceeded V1, the value of the change rate between V1 and Vx is ignored, as in FIG. Wait until V1 reaches V1 again. Thereby, erroneous determination of the lamp type due to instantaneous noise can be prevented.

<Embodiment 10>
27 to 29 show structural examples of lighting fixtures using the discharge lamp lighting device of the present invention. 27 is an example applied to a downlight, FIGS. 28 and 29 are examples applied to a spotlight, in which 11 is an electronic ballast storing a circuit of a lighting device, and 12 is a lamp mounted with a high pressure discharge lamp. , 13 are wiring.

  By installing the above-mentioned high-pressure discharge lamp lighting device that can distinguish the lamp type as these lighting devices, it is possible to save time and effort to replace the compatible high-pressure discharge lamp lighting device for each appliance, and to replace the lamp according to the application. It becomes possible.

  As described above, according to the present invention, it is possible to provide a high-pressure discharge lamp lighting device, a high-pressure discharge lamp lighting fixture, and a high-pressure discharge lamp lighting system that are compatible with a plurality of types of HID lamps.

1 is a circuit diagram of a high pressure discharge lamp lighting device according to Embodiment 1 of the present invention. It is a wave form diagram for operation | movement description of the detection circuit used for the lighting device of FIG. It is a characteristic diagram which shows the rising characteristic of the lamp voltage at the time of the initial start of the high pressure discharge lamp, and at the time of restart. It is explanatory drawing which shows the change of the emission spectrum at the time of the first start of a high pressure discharge lamp. It is explanatory drawing which shows the change of the emission spectrum at the time of restart of a high pressure discharge lamp. It is a characteristic view which shows the rise characteristic of the lamp voltage at the time of the initial start of the high pressure discharge lamp from which rated power differs. It is a characteristic view which shows the rise characteristic of the lamp voltage at the time of restart of the high pressure discharge lamp from which rated power differs. It is the characteristic view which expanded and showed the part in which the rise characteristic of the lamp voltage of the high voltage | pressure discharge lamp from which rated power differs differs substantially linearly. It is a characteristic view which shows the rise characteristic of the lamp voltage at the time of the initial start of the high pressure discharge lamp from which rated power differs. It is a characteristic view which shows the rise characteristic of the lamp voltage at the time of restart of the high pressure discharge lamp from which rated power differs. It is the characteristic view which expanded and showed the part in which the rise characteristic of the lamp voltage of the high voltage | pressure discharge lamp from which rated power differs differs substantially linearly. It is principle explanatory drawing of the lamp | ramp kind discrimination | determination by Embodiment 2 of this invention. It is a circuit diagram of the high pressure discharge lamp lighting device concerning Embodiment 3 of the present invention. It is principle explanatory drawing of the lamp | ramp kind discrimination | determination by Embodiment 3 of this invention. It is principle explanatory drawing of the lamp | ramp kind discrimination | determination by Embodiment 4 of this invention. It is a circuit diagram of the high pressure discharge lamp lighting device which concerns on Embodiment 5 of this invention. It is principle explanatory drawing of the lamp | ramp kind discrimination | determination by Embodiment 5 of this invention. It is a flowchart for operation | movement description of Embodiment 5 of this invention. It is a circuit diagram of the high pressure discharge lamp lighting device concerning Embodiment 6 of the present invention. It is principle explanatory drawing of the lamp | ramp kind discrimination | determination by Embodiment 6 of this invention. It is principle explanatory drawing of the lamp | ramp kind discrimination | determination by Embodiment 7 of this invention. It is principle explanatory drawing of the lamp | ramp kind discrimination | determination by Embodiment 7 of this invention. It is principle explanatory drawing of the lamp | ramp kind discrimination | determination by Embodiment 8 of this invention. It is principle explanatory drawing of the lamp | ramp kind discrimination | determination by Embodiment 9 of this invention. It is explanatory drawing which shows an example of the instantaneous noise detected in Embodiment 9 of this invention. It is explanatory drawing which shows the other example of the instantaneous noise detected in Embodiment 9 of this invention. It is a perspective view which shows an example of the lighting fixture using the high pressure discharge lamp lighting device of this invention. It is a perspective view which shows another example of the lighting fixture using the high pressure discharge lamp lighting device of this invention. It is a perspective view which shows another example of the lighting fixture using the high pressure discharge lamp lighting device of this invention. It is a block circuit diagram which shows schematic structure of the conventional high pressure discharge lamp lighting device.

Explanation of symbols

V1, V2 Lamp voltage detection value t1, t2 Elapsed time after lighting DL High pressure discharge lamp 5 Lamp type discrimination circuit

Claims (19)

A power conversion circuit that converts power from a DC power source and supplies power to the high-pressure discharge lamp, and a lighting control circuit that controls the power supplied to the power conversion circuit. A discharge lamp lighting device that is lit by connecting any one of the above, and the type of the connected high-pressure discharge lamp is determined by looking at the rate of change in electrical characteristics during a specific period of the high-pressure discharge lamp. In a discharge lamp lighting device for lighting a high pressure discharge lamp connected with desired electrical characteristics selected based on the above, the rate of change is the time characteristic of the voltage characteristic of the high pressure discharge lamp from the first voltage to the second voltage. And a value obtained by adding all of the voltages detected at the predetermined time interval or a value obtained by adding all the voltages detected at the predetermined time interval . 1 voltage to 2nd power The discharge lamp lighting apparatus which is a value obtained by dividing the time required to shift to. A power conversion circuit that converts power from a DC power source and supplies power to the high-pressure discharge lamp, and a lighting control circuit that controls the power supplied to the power conversion circuit. A discharge lamp lighting device that is lit by connecting any one of the above, and the type of the connected high-pressure discharge lamp is determined by looking at the rate of change in electrical characteristics during a specific period of the high-pressure discharge lamp. In the discharge lamp lighting device for lighting the high pressure discharge lamp connected with the desired electrical characteristics selected based on the above, the rate of change is the predetermined time after the voltage characteristics of the high pressure discharge lamp reach the first voltage. It is detected at a fixed time interval by the detection circuit that the change with time until the time elapses, and a value obtained by adding all the voltages detected at the fixed time interval or a voltage detected at the fixed time interval. by adding all values The discharge lamp lighting apparatus which is a value obtained by dividing the predetermined time. In addition to the first rate of change according to claim 1 or 2, as the second rate of change, the time required for the voltage characteristic of the high pressure discharge lamp to reach the third voltage from the second voltage is used as the second rate of change. The discharge lamp lighting device according to claim 1 or 2, wherein the type is discriminated. In addition to the first rate of change according to claim 1 or 2, as a second rate of change, the voltage characteristic of the high-pressure discharge lamp changes over time from the second voltage to the third voltage. Is detected at a certain time interval, and a value obtained by adding all the voltages detected at the certain time interval or a value obtained by adding all the voltages detected at the certain time interval is obtained from the second voltage to the third voltage. The discharge lamp lighting device according to claim 1 or 2, wherein the type of the high-pressure discharge lamp is determined using a value divided by the time required to reach the voltage. In addition to the first rate of change according to claim 1 or 2, as the second rate of change, after the voltage characteristic of the high-pressure discharge lamp reaches the second voltage, the voltage after a predetermined time is used as the second rate of change. The discharge lamp lighting device according to claim 1 or 2, wherein the type of electric lamp is determined. In addition to the first rate of change according to claim 1 or 2, as the second rate of change, after the voltage characteristic of the high-pressure discharge lamp reaches the second voltage, the predetermined time elapses. A change with time is detected at a fixed time interval, and a value obtained by adding all the voltages detected at the fixed time interval or a value obtained by adding all the voltages detected at the fixed time interval is the predetermined time. The discharge lamp lighting device according to claim 1 or 2, wherein the type of the high-pressure discharge lamp is determined using a value obtained by dividing by. In addition to the first rate of change according to claim 1 or 2, as the second rate of change, the time required for the voltage characteristics of the high-pressure discharge lamp to change from the third voltage to the fourth voltage is used. The discharge lamp lighting device according to claim 1 or 2, wherein the type is discriminated. In addition to the first rate of change according to claim 1 or 2, as the second rate of change, the voltage characteristic of the high-pressure discharge lamp changes from the third voltage to the fourth voltage as time elapses. Is detected at a certain time interval, and a value obtained by adding all of the voltages detected at the certain time interval or a value obtained by adding all the voltages detected at the certain time interval is calculated from the third voltage to the fourth voltage. The discharge lamp lighting device according to claim 1 or 2, wherein the type of the high-pressure discharge lamp is determined using a value divided by the time required to reach the voltage. In addition to the first rate of change according to claim 1 or 2, as the second rate of change, after the voltage characteristic of the high-pressure discharge lamp reaches the third voltage, the voltage after a predetermined time is used as the second rate of change. 7. The high pressure discharge lamp lighting device according to claim 1, wherein the type of electric lamp is discriminated. In addition to the first rate of change according to claim 1 or 2, as the second rate of change, after the voltage characteristic of the high-pressure discharge lamp reaches the third voltage, the predetermined time elapses. detects for transition over time at regular time intervals, added value of all the voltage detected by the constant time interval, or a value obtained by adding all of the voltages detected by the predetermined time interval the predetermined time The high-pressure discharge lamp lighting device according to claim 1, wherein the type of the high-pressure discharge lamp is determined using a value divided by. A discharge lamp lighting device, wherein, in addition to the rate of change according to any one of claims 1 to 10, the type of the high pressure discharge lamp is determined by a voltage when the voltage of the high pressure discharge lamp is the lowest. 12. The discharge lamp lighting device according to claim 1, wherein the high-pressure discharge lamp is a metal halide lamp containing at least mercury as a light emission source. 13. The discharge lamp lighting device according to claim 12, wherein the rate of change is determined in a region where mercury in the metal halide lamp is a main light emission source. 14. The discharge lamp lighting device according to claim 13, wherein the rate of change is determined in a region where the voltage of the metal halide lamp tends to increase with time. 15. The discharge lamp lighting device according to claim 13, wherein the lamp type is determined by the voltage of the high-pressure discharge lamp at a predetermined time within a region where a component other than mercury in the metal halide lamp is added as a main light emission source. In any one of Claims 1-15, when the rate of change of the voltage characteristic of a high-pressure discharge lamp is larger than the predetermined rate of change, the information on the rate of change is ignored, and the lamp type is determined. Discharge lamp lighting device. The discharge lamp lighting device according to any one of claims 1 to 16, wherein a lamp power characteristic is used instead of the voltage characteristic of the high-pressure discharge lamp. A discharge lamp lighting device using a microcomputer in the lighting control circuit of the high pressure discharge lamp lighting device according to any one of claims 1 to 17. A lighting fixture comprising the high-pressure discharge lamp lighting device according to any one of claims 1 to 18.

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