JP4590991B2 - Discharge lamp lighting device and lighting device - Google Patents

Description

  The present invention uses a discharge lamp lighting device capable of lighting a discharge lamp having a plurality of rated powers, and capable of automatically determining the rated power of the discharge lamp and lighting the discharge lamp with the rated power of the discharge lamp, and the same. The present invention relates to a lighting device.

  FIG. 13 shows a block diagram of a conventional example disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2003-229289), and FIGS. 14 and 15 show specific circuit configurations thereof. Hereinafter, the configuration of each unit will be described. The DC power source 1 includes an AC power source AC and a diode bridge DB. The AC power source AC is a commercial AC power source, and the voltage is, for example, 100V, 200V, or 240V.

  The diode bridge DB rectifies and outputs an AC voltage from the AC power supply AC into a pulsating DC voltage. Here, when the voltage of the AC power supply AC is 100 V, for example, a voltage doubler rectifier circuit may be used instead of the diode bridge. When the voltage doubler rectifier circuit is used, the voltage of the AC power supply can be regarded as substantially equal to 200 V, and the current flowing through the circuit connected after the voltage doubler rectifier circuit is about half that when using a diode bridge. Therefore, the efficiency of the discharge lamp lighting device can be increased.

  Further, an input filter circuit (not shown) including a capacitor and an inductor may be inserted before the diode bridge DB. When such an input filter circuit is inserted in front of the diode bridge DB, noise from the AC power supply AC is prevented from leaking to the power conversion circuit 2 described later, or conversely, It is possible to prevent noise from leaking to the power supply side.

  The power conversion circuit 2 includes a step-up chopper circuit 2a1, a step-down chopper circuit 2a2, and a full bridge inverter circuit 2b. The step-up chopper circuit 2a1 is for power factor improvement and converts a pulsating DC voltage from the diode bridge DB into a desired DC voltage and outputs it, and includes a switching element Q1, a diode D1, an inductor L1, and a capacitor C1. It is composed of The switching element Q1 is controlled, for example, by connecting the first pin of the integrated circuit MC34261 manufactured by Motorola, which is the control circuit IC2a1 of the step-up chopper circuit 2a1, to the gate of the switching element Q1. The first pin of the MC34261 is a pin that determines the drive frequency of the switching element Q1.

  Here, the step-up chopper circuit 2a1 may be a step-down chopper, a step-up / step-down chopper, or the like. In short, any circuit configuration may be used as long as it converts one DC voltage into another DC voltage.

  The step-down chopper circuit 2a2 controls power supplied to the high-pressure discharge lamp 3 described later, and includes a switching element Q2, a diode D2, an inductor L2, and a capacitor C2. Then, the switching element Q2 is controlled by, for example, an integrated circuit μPC 1094 manufactured by NEC, which is the control circuit IC2a2 of the step-down chopper circuit 2a2.

  Here, the step-down chopper circuit 2a2 may be a step-up chopper, a step-up / step-down chopper circuit, or the like. In the same manner as the boost chopper circuit 2a1, any circuit configuration may be used as long as it converts a certain DC voltage into another DC voltage.

  The full bridge inverter circuit 2b converts the DC voltage from the step-down chopper circuit 2a2 into a rectangular wave voltage by the on / off operation of the switching elements Q3 to Q6. The switching elements Q3 to Q6 are, for example, from a field effect transistor It is configured. Although a full bridge type inverter circuit is employed here, the inverter circuit may be a half bridge type, a single stone type, or a push-pull type. In short, any circuit configuration may be used as long as it converts a DC voltage into an AC rectangular wave voltage. Then, for example, an integrated circuit M63991FP manufactured by Mitsubishi Electric, which is the control circuit IC2b of the full bridge inverter circuit 2b, is connected to and controlled by the gates a, b, e, and d of the switching elements Q3 to Q6.

  The igniter circuit 2c is provided with a pulse voltage having a peak of several KV to the high pressure discharge lamp 3 and is started.

  In the high-pressure discharge lamp 3, a discharge gas such as an inert gas (for example, argon or krypton) or mercury (other sodium or cadmium) vapor is enclosed in a ceramic or glass container, and electrons are contained in the excited encapsulated metal. Visible light is generated by collision. The high-pressure discharge lamp 3 is assumed to be a metal halide lamp having substantially the same outer dimensions and different arc distances in the arc tube of 5 mm, 7 mm, and 9 mm. The electrical characteristics of this metal halide lamp are as follows: the distance between the arcs is 5 mm, the lamp power is 35 W, the lamp voltage is 90 V, the lamp current is 0.5 A, the distance between the arcs is 7 mm, the lamp power is 70 W, the lamp voltage is 90 V, The lamp current is 1 A, the distance between arcs is 9 mm, the lamp power is 150 W, the lamp voltage is 95 V, and the lamp current is 1.8 A. Although a metal halide lamp is assumed here, the high pressure discharge lamp 3 may be any HID lamp such as a high pressure sodium lamp.

  As shown in FIG. 14B, the lighting control circuit 4 includes a comparator COMP1, a comparator COMP2, and the like, and a reference output of an oscillation circuit including a signal from an Ila detection circuit 5a, which will be described later, and the comparator COMP1. The signal is compared and the switching element Q2 is controlled via the control circuit IC2a2.

  As shown in FIG. 14A, the detection means 5 is composed of an Ila detection circuit 5a that detects a lamp current and a Vla detection circuit 5b that detects a lamp voltage.

  The Vla detection circuit 5b is composed of an amplifier OPAMP1 and the like, and a divided voltage Vla of a resistor R1 and a resistor R2 proportional to the ramp voltage is input to the inverting input terminal of the amplifier OPAMP1 via the resistor. And the target value voltage Vi of the lamp current as a voltage value according to the lamp voltage is generated.

  The Ila detection circuit 5a includes an amplifier OPAMP2 and the like, amplifies a voltage based on an error between the target value voltage Vi and the lamp current Ila flowing through the resistor R3, and is applied to the non-inverting input terminal of the comparator COMP2 of the lighting control circuit 4. input. The comparator COMP2 compares the voltage input to the non-inverting input terminal with the triangular wave voltage input to the inverting input terminal, thereby generating a pulse voltage that controls the switching element Q2 on / off.

  As shown in FIG. 15, the timer means 6 includes a comparator COMP3, a Zener diode ZD, a capacitor C0, and resistors R5 and R6. One ends of the resistors R5 and R6 are connected to the control power supply voltage Vcc. Of course, the timer means 6 is not limited to that shown in the figure, and for example, NE555 which is an 8-pin type IC manufactured by Signatures may be used. Since the operation of NE555 is well known, detailed description of the operation is omitted.

  As shown in FIG. 15, the determination unit 7 includes a latch circuit RS, a comparator COMP4, a switch element SW, a diode D0, a reference voltage Vc, and resistors R3, R4, Rw70, and Rw150.

  Next, the operation of the conventional example will be described. Here, FIG. 16A shows a change in the lamp voltage Vla when the HID lamp with a rated power of 70 W and the HID lamp with a power of 150 W are connected when the discharge lamp lighting device outputs 70 W, respectively. 16 (b) shows the Q outputs of the comparator COMP3, the comparator COMP4 and the latch circuit RS when a 150 W HID lamp is connected to the discharge lamp lighting device, and FIG. 16 (c) shows the discharge lamp lighting device. 4 shows the Q outputs of the comparator COMP3, the comparator COMP4 and the latch circuit RS when a 70 W HID lamp is connected.

  Consider a case where an HID lamp with a rated power of 150 W is connected to the discharge lamp lighting device. When the AC power supply AC is turned on, power is supplied to the step-up chopper circuit 2a1, the step-down chopper circuit 2a2, and the full bridge inverter circuit 2b, and the on / off operation of the switching elements Q3 to Q6 is started. Then, a dielectric breakdown voltage is applied by the igniter circuit 2c, and the HID lamp 3 is started. When the HID lamp 3 is started, the igniter circuit 2c stops operating and power is supplied to the HID lamp 3, and the lamp voltage starts to rise as shown in FIG. In addition, charging of the capacitor C0 is started simultaneously with the turning on of the AC power supply AC. Then, at t = t1 shown in FIG. 16A, the charging voltage of the capacitor C0 exceeds the threshold voltage of the comparator COMP3, and the comparator COMP3 is turned on. When the comparator COMP3 is turned on, its output, that is, the potential on the cathode side of the diode D0 becomes H level, and the anode side of the diode D0, that is, the set input S of the latch circuit RS is determined by the output of the comparator COMP4.

  Next, when the ramp voltage reaches Vc at t = t4, the inverting input of the comparator COMP4 becomes larger than the non-inverting input Vc, and at this point, the comparator COMP4 is turned off. That is, at t = t4, the output of the comparator COMP4 changes from the H level to the L level. However, since the comparator COMP3 is already on at t = t1 earlier than that, the latch circuit is reached at the time t = t1. The H signal is input to the set input S of the RS, and the output Q of the latch circuit RS outputs the H signal as shown in FIG. As a result, the switch element SW is turned on, so that the current input to the Ila detection circuit 5a has a value determined by the parallel resistance of the resistors R3, Rw70, and Rw150. That is, the target value voltage Vi is a voltage of an HID lamp with a rated power of 150 W, and the lighting control circuit 4 causes the HID lamp with a rated power of 150 W to light at 150 W of the rated power based on the target value voltage Vi.

  When an HID lamp with a rated power of 70 W is connected to the discharge lamp lighting device, the inverting input of the comparator COMP4 is a non-inverting input at a time t = t3 earlier than t = t1 when the comparator COMP3 is turned on. It becomes larger than Vc, and at this time, the comparator COMP4 is turned off. That is, at t = t3, the output of the comparator COMP4 changes from the H level to the L level. Even when the comparator COMP3 is turned on at a later time t = t1, the H signal is output to the set input S of the latch circuit RS. It is never entered. Therefore, since the output Q of the latch circuit RS outputs an L signal, the switch element SW is turned off, and the current input to the Ila detection circuit 5a has a value determined by the resistors R3 and Rw70. That is, the target value voltage Vi is a voltage of an HID lamp with a rated power of 70 W, and the lighting control circuit 4 causes the HID lamp with a rated power of 70 W to light at 70 W of the rated power based on the target value voltage Vi.

  If the number of switch elements SW, resistors Rw70 and resistors Rw150 is appropriately increased according to the type of high-pressure discharge lamp, a plurality of high-pressure discharge lamps having different rated powers can be lit with the rated power of the high-pressure discharge lamp. .

  As described above, each high-pressure discharge lamp can be lit at rated power according to the type of the high-pressure discharge lamp by using one discharge lamp lighting device.

  Next, the discharge lamp lighting device shown in FIG. 17 has a configuration in which correction means 10 for correcting the accumulated time of the timer means 6 is added to the discharge lamp lighting device shown in FIG. When the discharge lamp lighting device is restarted, the temperature of the high pressure discharge lamp 3 has risen, and therefore, it is in a state where it is easier to light than at the initial start. That is, as shown in FIG. 18A, the time t = t1 until reaching the predetermined threshold voltage Va provided in the determination means 7 is compared with the time t = t2 until reaching the threshold voltage Va at the initial start. Become shorter. Therefore, in this case, if the time of (t2-t1) is corrected by the correction means 10, it is possible to prevent an erroneous determination of the type of the high-pressure discharge lamp at the time of restart.

As described above, in the lighting device disclosed in Patent Document 1, a plurality of HID lamps with rated power are set as target loads, the load type is determined from the transient characteristics when the lamps are lit, and both lamps are rated lit. It is possible to use lamps with different rated powers with a single lighting device. For this reason, for example, it is easy to switch to a lamp with a rated power lower than usual for energy saving. Alternatively, there is an advantage that only the lamp needs to be replaced when the optical design is changed due to renovation of a store or the like.
JP 2003-229289 A

  When the technique of Patent Document 1 is used, in the restart mode in which the power is turned on again immediately after the lamp is extinguished, 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 is steadily turned on, there is a possibility that an excessive load is applied to the lamp, and the 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 with the same detection / control method regardless of the lamp start state (initial start / restart). To provide a discharge lamp lighting device that can determine the rated power type of the lamp of the lamp and that can be lit with less stress on the lamp by enabling primary determination before stable lamp lighting. is there.

In 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 power supplied to the power conversion circuit And a discharge lamp discriminating circuit that detects the electrical characteristics of the discharge lamp and discriminates the rated power type of the discharge lamp, and loads a high-pressure discharge lamp of a plurality of rated power types, one of which is connected. The discharge lamp lighting device that is lit in a transient state, in which the rated power type of the connected high-pressure discharge lamp is a period during which the electrical characteristics of the high-pressure discharge lamp continue to change until the stable lighting is started after the high-pressure discharge lamp starts. The electrical characteristics of the high-pressure discharge lamp are determined by the discharge lamp discrimination circuit based on the electrical characteristics of the discharge lamp between the period and the stable period in which the electrical characteristics of the high-pressure discharge lamp after the start has sufficiently passed are stable. Electrical characteristics during the transition period And is the rate of change of the discharge lamp voltage of the high pressure discharge lamp, the electrical characteristics of the stabilization period, when is lit by direct current as when is lit at a low frequency of several tens to several hundred Hz in a predetermined power It is the rate of change of the discharge lamp voltage, and the supplied power of the power conversion circuit is controlled based on the determined result, and the connected high pressure discharge lamp is turned on. Here, the electrical characteristics of the discharge lamp include the voltage, current, and power of the discharge lamp, the rate of change thereof, the time required for the change, and the like.

  According to the present invention, as described above, the connection is made from the electrical characteristics of the discharge lamp between the transient period until the stable lighting after starting of the high-pressure discharge lamp and the stable period after the start of sufficient time. Since the power type of the high-pressure discharge lamp is discriminated, it is possible to discriminate the rated power type of multiple types of lamps with the same detection and control method, and furthermore, primary discrimination is possible before stable lamp lighting. There is an effect that the lamp can be turned on with less stress.

(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. The DC power source 1 includes a commercial AC power source Vs and a diode bridge DB, and outputs a pulsating voltage obtained by full-wave rectifying the commercial AC voltage. The step-up chopper circuit 2a1, the step-down chopper circuit 2a2, and the full bridge inverter circuit 2b connected to the output terminal of the DC power supply 1 constitute a power conversion circuit. The step-up chopper circuit 2a1 is for power factor improvement and converts a pulsating DC voltage from the diode bridge DB into a desired DC voltage and outputs it, and includes a switching element Q1, a diode D1, an inductor L1, and a capacitor C1. It is composed of The step-down chopper circuit 2a2 controls the power supplied to the high-pressure discharge lamp 3, and includes a switching element Q2, a diode D2, an inductor L2, and a capacitor C2. The full bridge inverter circuit 2b converts the DC voltage from the step-down chopper circuit 2a2 into a rectangular wave voltage by the on / off operation of the switching elements Q3 to Q6. The switching elements Q3 to Q6 are, for example, from a field effect transistor It is configured. The igniter circuit 2c is provided with a pulse voltage having a peak of several KV to the high pressure discharge lamp 3 and is started, and is composed of a capacitor, a pulse transformer, and the like. IC2a1 is a control circuit for the step-up chopper circuit 2a1, and IC2b is a control circuit for the full-bridge inverter circuit 2b. Since the configuration of these power conversion circuits is the same as that of the conventional example, redundant description is omitted.

  Next, FIG. 2 shows a specific circuit configuration of the lighting control circuit 4a that controls the power supplied to the power conversion circuit. There are various methods for controlling the load power. Here, when the output voltage of the boost chopper circuit 2a1 (the voltage of the capacitor C1) is controlled to a desired constant voltage, the output flowing out from the capacitor C1. A method of controlling the power supplied to the load by controlling the current to an appropriate value is adopted.

  For example, when the output voltage of the capacitor C1 is 300 V and a discharge lamp with a rated power of 70 W is to be lit at a rating, the average current flowing out from the capacitor C1 is controlled so that 70 W / 300 V = 0.78 A. Desired power can be supplied to the load. For this purpose, the current flowing through the current detection resistor R3 is detected as an average value by a CR integration circuit made up of resistors R14 and R15 and capacitors C3 and C4, and the reference value set by the resistors R7, R8, R9 and R16 is used. A PWM signal for controlling on / off of the switching element Q2 by generating a control signal having an appropriate ON width by comparing with the error amplifier OP1 and comparing it with a high-frequency sawtooth signal by the comparator COMP2. Is generated.

  Here, a MOS transistor Q7 is connected in parallel to the resistor R16 that determines the reference value of the error amplifier OP1, and the power supplied to the load is switched in two stages by switching the MOS transistor Q7 on and off. be able to. Further, by continuously changing the gate-source voltage of the MOS transistor Q7, the power supplied to the load can be adjusted to an arbitrary power. In this circuit, the power supplied to the load can be adjusted by switching the gate-source voltage of the MOS transistor Q7 by the output of the discharge lamp discrimination circuit 7a.

  Next, the discharge lamp determination circuit 7a will be described. The discharge lamp discriminating circuit 7a is constituted by, for example, a microcomputer having an A / D conversion function and a D / A conversion function, and the lamp voltage divided by the resistors R1 and R2 using the A / D conversion function. Detectable. Further, by using the D / A conversion function to switch the voltage between the gate and source of the MOS transistor Q7, the power supplied to the discharge lamp is switched as described later so that a change in the lamp voltage can be detected. ing. Thereby, the lamp voltage between the transient period until the stable lighting after starting of the high-pressure discharge lamp 3 and the stable period after the start has sufficiently passed is detected, and the lamp voltage is connected based on the detection result. Determine the rated power of the discharge lamp. Then, in accordance with the determination result, the gate-source voltage of the MOS transistor Q7 is switched to operate the connected discharge lamp to be stably lit at the rated power.

  FIG. 3 is a diagram for explaining the principle of primary determination of the rated power using the rising characteristics of the lamp voltage during the transition period until the stable lighting after starting the discharge lamp discriminating circuit 7a, and it is a CDM35 / PAR30L manufactured by Philips (rated power 39W). , Rated voltage 90V), and CDM70 / PAR30L (rated power 70W, rated voltage 90V) when the same lighting device is lit, shows the rising characteristics of the lamp voltage Vla. The horizontal axis represents the elapsed time (lighting time) after power-on, and the vertical axis represents the lamp voltage Vla (V). When the high-pressure discharge lamp is turned on, the lamp voltage Vla increases from the low voltage immediately after starting to the rated voltage as shown in FIG. At this time, for example, the time required to shift from Vla = 30 V to Vla = 40 V is about 5 seconds for CDM 35 and about 15 seconds for CDM 70 from FIG. Therefore, the lamp rated power can be determined by measuring this time and setting the threshold for comparison determination to about 10 seconds.

  FIG. 4 shows the results of measuring the time required to shift from Vla = 30 V to Vla = 40 V for a plurality of types of lamps (rated power 39 W, 70 W). From this figure, it can be seen that the rated power of the lamp can be determined by setting the threshold value for comparison determination in the range of about 5 to 7 seconds, although there is some variation in the rise time.

  The lamp 3 can be lit with appropriate power by adjusting the current flowing through the current detection resistor R3 by the lighting control circuit 4a so that the rated power of the lamp determined by the discharge lamp determination circuit 7a is obtained. Here, this determination result is not a final result but a primary determination result.

Next, the principle of the secondary determination of the rated power using the lamp voltage during the stable period of the discharge lamp determination circuit 7a will be described.
5 and 6 show load characteristics of a general metal halide lamp. FIG. 5 shows the relationship between the lamp power Wla and the lamp voltage Vla for a lamp with a rated power of 39 W and a rated voltage of 90 V. From the figure, the lamp is generally designed to operate at the rated voltage when it is lit at the rated power, but when the lamp is lit at the power higher than the rated power, as shown in the region X in the figure The lamp voltage Vla is higher than the voltage lit at the rated power. Further, when the lamp is lit at the power lower than the rated power, as shown in the region Y in the figure, the lamp voltage Vla falls below the voltage lit at the rated power, and when the lighting power is further reduced, As shown in the region Z of the figure, the ramp voltage Vla begins to rise rapidly.

  FIG. 6 shows the relationship between the lamp power Wla and the lamp voltage Vla for a lamp with a rated power of 70 W and a rated power of 39 W (both rated voltage is 90 V). From the figure, in the lamp with the rated power of 70 W, the region Z appears in the vicinity of about 39 W, whereas in the lamp with the rated power of 39 W, the region X or Y is in the region around the lighting power of 39 W.

  As can be seen from FIGS. 5 and 6, in order to determine the rated power of the rated power 39W and 70W lamps, how the lamp voltage Vla changes when the lamp is lit at two locations near the lighting power 39W. It is understood that it is sufficient to detect. Here, the determination result (secondary determination result) obtained from the determination result (primary determination result) of the rising characteristic of the lamp voltage Vla and the Wla-Vla characteristic of the lamp at the time of stable lighting shown in FIGS. ) Can be more reliably discriminated from the rated power of the lamp.

  Specifically, the primary determination based on the principle of FIG. 3 is performed in the transition period after the power is turned on, and the secondary determination based on the principle of FIG. 6 is performed in the stable period after sufficient time has passed. good. That is, after the power is turned on, when the high-pressure discharge lamp 3 is turned on by the high-pressure pulse generation operation of the igniter circuit 2c, the lamp voltage Vla increases from the low voltage immediately after the start toward the rated voltage. When the timer is started and Vla ≧ 40V, the microcomputer timer is stopped, the time T1 required to shift from Vla = 30V to Vla = 40V is measured, and this is the measurement result of the transition period (primary determination result) And

  Next, how the lamp voltage Vla changes when the lamp is lit at two places near the lighting power 39W is detected. Specifically, the reference of the operational amplifier OP1 is adjusted by adjusting the voltage between the gate and source of the MOS transistor Q7 from the D / A conversion port of the microcomputer so that the lamp power of 39W ± ΔW shown by the one-dot chain line in FIG. Variable control of voltage. Accordingly, the lamp voltage Vla1 when the lamp is stably lit with the lamp power of the lighting power 39W + ΔW and the lamp voltage Vla2 when the lamp is steadily lit with the lamp power of the lighting power 39W−ΔW are detected, and these are detected during the stable period. Let it be a measurement result (secondary determination result). Whether or not the lamp is stably lit may be determined by detecting that the detected lamp voltage has hardly changed (dVla / dt≈0). Specifically, the lamp voltage input from the A / D conversion port of the microcomputer is observed at regular intervals using a timer interrupt, etc., and stable when the voltage change observed multiple times falls below a predetermined value. What is necessary is just to determine with lighting.

  Based on the measurement result T1 of the transient period and the measurement results Vla1 and Vla2 of the stable period, the lamp type of the discharge lamp is finally determined, and the rated lighting is performed at the determined rated power of 70 W or 39 W. In addition, the gate-source voltage of the MOS transistor Q7 is switched from the D / A conversion port of the microcomputer.

  Here, the microcomputer constituting the discharge lamp discriminating circuit 7a has both an A / D conversion function for detecting the lamp voltage and a D / A conversion function for switching the target value of the lamp power. As explained on the premise, as another means, for example, a PWM signal with variable duty is output from a binary output port of a microcomputer, and an analog voltage obtained by filtering this PWM signal by a CR integration circuit is used as the gate and source of the MOS transistor Q7. It is possible to adjust the reference voltage of the operational amplifier OP1 by applying in between, or connect a plurality of series circuits of resistors and switch elements in parallel with the resistor R16 to turn on / off each switch element. It may be configured to switch by the H / L output of the binary output port. In short, any configuration may be used as long as the lamp power during stable lighting can be adjusted by a microcomputer, and the configuration of the lighting control circuit 4a is not limited to that illustrated.

(Embodiment 2)
FIG. 7 shows the load characteristics of a general metal halide lamp (rated power 39 W, 70 W, both rated voltage 90 V). The vertical axis represents the lamp power Wla, and the horizontal axis represents the lamp voltage Vla. The solid line AA 'and the dotted line aa' are rated power of 70W and a lamp with a rated voltage of 90V, and the solid line BB 'and dotted line bb' are the load characteristics of a lamp with a rated power of 39W and a rated voltage of 90V (Wla-Vla). Characteristic). The solid line is the load characteristic when the lamp is lit with a square wave current of several tens to several hundreds of Hz, and the dotted line is the load characteristic when the lamp is lit with a direct current.

  As apparent from FIG. 7, in the vicinity of the rated power, there is almost no difference between the lamp voltage Vla when lit with a rectangular wave current of several tens to several hundreds of Hz and the lamp voltage Vla when lit with a direct current. Absent. On the other hand, in a region smaller than the rated power, the lamp voltage Vla when lit with a direct current is smaller than the lamp voltage Vla when lit with a rectangular wave current. Therefore, by calculating the rate of change of the lamp voltage Vla by performing lighting with a rectangular wave current and lighting with a direct current in the vicinity of the smaller rated power of two lamps with different rated powers, It becomes possible to determine the rated power.

  The circuit configuration of this embodiment is basically the same as that of FIGS. 1 and 2, but in this embodiment, the polarity inversion operation by the control circuit IC2b of the full-bridge inverter circuit 2b constitutes the discharge lamp determination circuit 7a. It is necessary to be able to switch between lighting with a rectangular wave current and lighting with a direct current by placing it under the control of a microcomputer. Moreover, the program for discriminating the electrical characteristics in the stable period of the microcomputer constituting the discharge lamp discriminating circuit 7a is changed. Specifically, in the first embodiment, the lamp voltages Vla1 and Vla2 are detected when the lamp is lit with two lamp powers (39W ± ΔW) in the vicinity of the smaller rated power 39W in the stable period. Thus, in the present embodiment, it is necessary to be configured to detect a difference in lamp voltage between when the rectangular wave is lit with the smaller rated power 39W and when the dc light is lit with the smaller rated power 39W. .

  Regarding the order of lighting with a rectangular wave current and lighting with a direct current, when a high pressure discharge lamp is started, lighting with a direct current may be temporarily maintained to prevent extinction. After the maintenance, the rated power of the lamp may be determined by observing the rate of change of the lamp voltage Vla when switching to lighting with a rectangular wave current in order to improve the electrode life. That is, after switching on lighting with a direct current, when switching to lighting with a rectangular wave current, if the rate of change of the lamp voltage Vla is smaller than the threshold, the lamp voltage Vla may be lit as it is with the smaller rated power. If the rate of change is larger than the threshold value, it is sufficient to switch to the larger rated power and light up. Here, the threshold value for determination is larger than the distance between the straight line BB ′ and the dotted line bb ′ and the distance between the straight line AA ′ and the dotted line aa ′ at 39 W in FIG. What is necessary is just to set to smaller predetermined value.

  In addition, as the electrical characteristics during stable lighting, the discharge lamp voltage when lighting at a low frequency of several tens to several hundreds Hz with the lowest rated power among a plurality of types of discharge lamps, and even more than the lowest rated power Using the value obtained by combining the discharge lamp voltage when lit at a low frequency of several tens to several hundreds of Hz with low power and the discharge lamp voltage when lit with direct current below the lowest rated power Also good. For example, the case of FIG. 7 will be specifically described. The discharge lamp voltages VlaA and VlaB when the lamp is turned on with a rectangular wave current of several tens to several hundreds of Hz with a lighting power of 39 W and smaller 30 W are detected. Furthermore, the discharge lamp voltage VlaC when the lamp is lit with a direct current with a lighting power of 39 W or 30 W is detected, and these discharge lamp voltages VlaA, VlaB, VlaC are combined and used as electrical characteristics during stable lighting. Also good. In this way, it is possible to make a determination based on the principle of the first embodiment by comparing VlaA and VlaB, and then to make a determination based on the principle of the second embodiment by comparing VlaA or VlaB and VlaC. Together, both enable determination with high accuracy by combining Embodiment 1 and Embodiment 2.

(Embodiment 3)
FIG. 8 shows the load characteristics of a general metal halide lamp (rated power 39 W, 70 W, both rated minimum voltage 75 V). The vertical axis represents the lamp power Wla, and the horizontal axis represents the lamp voltage Vla. A solid line AA ′ indicates a load characteristic (Wla-Vla characteristic) of a lamp having a rated power of 70 W, and a solid line BB ′ indicates a lamp having a rated power of 39 W. FIG. 8 shows that when two lamps are lit in the range of 70 W with the highest rated power and 39 W with the lowest rated power, it is always the lamp with the rated power of 70 W that has a rated minimum voltage of 75 V or less. .

  FIG. 9 shows load characteristics of a general metal halide lamp (rated power of 39 W and 70 W, both rated maximum voltage 115 V). The vertical axis represents the lamp power Wla, and the horizontal axis represents the lamp voltage Vla. A solid line A-A 'indicates a load characteristic (Wla-Vla characteristic) of a lamp with a rated power of 70 W, and a solid line B-B' indicates a lamp with a rated power of 39 W. FIG. 9 shows that when two lamps are lit in the range of 70 W with the highest rated power and 39 W with the lowest rated power, it is always the lamp with the rated power of 39 W that has a rated maximum voltage of 115 V or higher. .

  FIG. 10 shows the load characteristics of several lamps with rated power of 39 W and 70 W, rated voltage of 90 V, rated minimum voltage of 75 V, and rated maximum voltage of 115 V. From FIG. 10, it can be seen that only the lamp with the rated power of 70 W has the rated minimum voltage of 75 V or less within the range of 39 W to 70 W. That is, when determining the rated power of the two lamps, it is possible to determine the rated power of the lamp by detecting the lamp voltage Vla when the lamps are lit in the rated power range of the two lamps.

  The circuit configuration of this embodiment is the same as that shown in FIGS. 1 and 2, and only the program for determining the electrical characteristics during the stable period of the microcomputer constituting the discharge lamp determination circuit 7a may be changed. Specifically, when any of a plurality of compatible lamps having the same rated voltage and different rated power is mounted, the lamp is lit in the range of the maximum rated power and the minimum rated power, and the lamp voltage Vla at that time is determined. If it is below the rated minimum voltage, it is determined that the lamp has the maximum rated power, and if it is above the rated maximum voltage, it can be determined that the lamp has the minimum rated power.

(Embodiment 4)
FIG. 11 shows a flowchart for discriminating the power of the rated power of 39 W and 70 W. The circuit configuration of the present embodiment is the same as that shown in FIGS. 1 and 2, and shows an outline of a microcomputer program constituting the discharge lamp discrimination circuit 7a. First, a time T1 required for the lamp voltage to rise from 30V to 40V is measured in a transition period from when the lamp is lit until the lamp voltage is stabilized. If the measurement result at that time is 7 seconds or less, it is 39 W, and if it is longer than 7 seconds, it is determined as 70 W, but the determination result is temporarily stored in the memory in the microcomputer constituting the discharge lamp determination circuit 7 a ( First discrimination result).

  Next, if the lamp voltage when the two lamps are lit at the smaller rated power (Wla = 39 W) is 75 V or more of the rated minimum voltage, it is determined to be 39 W, and if it is less than 75 V, it is determined to be 70 W. Again, the determination result and the lamp voltage Vla1 at that time are stored in the memory (second determination result).

  Next, the lighting power is further lowered than the smaller one of the rated powers of the two lamps. This time, Wla = 30W. The lamp voltage Vla2 when the 30 W power is turned on is detected, and the rate of change from the previous lamp voltage Vla1 is calculated. As a result, if Vla1-Vla2 ≦ 0, it is determined as 70 W, and if Vla1-Vla2> 0, it is determined as 39 W (third determination result).

  From the above three determination results, the rated power of the connected load is determined. If the first determination result, the second determination result, and the third determination result do not match, the light may be turned on at the rated power based on the determination result by majority decision, or it may be turned off or dimmed as indistinguishable. You may control.

  Here, as the first determination result, the time required for the change from V1 to V2 in the discharge lamp voltages V1 and V2 (V1 <V2) set in advance is compared with a predetermined reference value. A value obtained by dividing the difference between the discharge lamp voltages V1 and V2 (V1 <V2) by the time required for the change from V1 to V2 may be compared with a predetermined reference value or set in advance. A value obtained by integrating the discharge lamp voltage in the range of the discharge lamp voltages V1 and V2 (V1 <V2) may be compared with a predetermined reference value. Specifically, the discharge lamp voltage Vla is detected at regular intervals, and an integrated value of the detected voltage from Vla ≧ V1 to Vla ≧ V2 is obtained, and this is compared with a predetermined reference value. Also good.

  Further, as the rate of change of the discharge lamp voltage, a value obtained by integrating the discharge lamp voltages in the range of the discharge lamp voltages V3 and V4 when the lamps are lit with two electric powers W1 and W2 (W1> W2) may be used. . For example, when W1 = 39W and W2 = 30W, the discharge lamp detection Vla is in a range from the discharge lamp voltage V3 when the lamp is lit at W1 = 39W to the discharge lamp voltage V4 when the lamp is lit at W2 = 30W. It may be detected at regular intervals, an integrated value of the detected voltage may be obtained and compared with a predetermined reference value.

(Embodiment 5)
FIG. 12 shows a structural example of a lighting fixture using the discharge lamp lighting device of the present invention. (A), (b) is an example applied to a spotlight, (c) is an example applied to a downlight. In the figure, 11 is an electronic ballast storing a circuit of a lighting device, and 12 is a high pressure discharge lamp. The lamp body 13 is a wiring. In any lighting fixture, a plurality of types of high-pressure discharge lamps such as 35 W and 70 W can be appropriately selected and mounted. A plurality of these lighting fixtures may be combined to construct an illumination system, and a plurality of different types of high-pressure discharge lamps may be used in combination depending on the required illuminance, emission color, design, and the like. By installing the high pressure discharge lamp lighting device capable of discriminating the above-mentioned lamp type as these lighting devices, it is not necessary to change the lighting device for each lamp.

It is a block circuit diagram which shows schematic structure of Embodiment 1 of this invention. It is a circuit diagram which shows the detailed structure of Embodiment 1 of this invention. It is a lamp voltage rise characteristic figure of the high pressure discharge lamp from which rated power differs. It is a figure which shows the result of having measured the rise time of the lamp voltage of multiple types of high pressure discharge lamps. It is explanatory drawing which shows the load characteristic of a general high pressure discharge lamp. It is explanatory drawing which shows the difference in the load characteristic at the time of the stable lighting of the high pressure discharge lamp from which rated power differs. It is operation | movement explanatory drawing of Embodiment 2 of this invention. It is operation | movement explanatory drawing of the minimum rated voltage vicinity of Embodiment 3 of this invention. It is operation | movement explanatory drawing of the maximum rated voltage vicinity of Embodiment 3 of this invention. It is a load characteristic figure at the time of the stable lighting of several types of high pressure discharge lamps. It is a flowchart for operation | movement description of Embodiment 4 of this invention. It is a perspective view which shows the structural example of the lighting fixture using the discharge lamp lighting device of this invention. It is a block diagram of the conventional high pressure discharge lamp lighting device. It is a specific circuit diagram of a conventional high pressure discharge lamp lighting device. It is a specific circuit diagram which shows the principal part structure of the conventional high pressure discharge lamp lighting device. It is operation | movement explanatory drawing of the conventional high pressure discharge lamp lighting device. It is a block diagram which shows the other structural example of the conventional high pressure discharge lamp lighting device. It is operation | movement explanatory drawing of the prior art example of FIG.

Explanation of symbols

1 DC power supply 2 Power conversion circuit 3 Discharge lamp 4a Lighting control circuit 7a Discharge lamp discrimination circuit

Claims (14)

A power conversion circuit that converts power from a DC power source to supply power to the high-pressure discharge lamp, a lighting control circuit that controls the power supplied to the power conversion circuit, and the discharge lamp's rated power A discharge lamp lighting circuit comprising: a discharge lamp discriminating circuit for discriminating a species; a discharge lamp lighting device for lighting a high-pressure discharge lamp of a plurality of rated power types connected to one of them; The rated power type of the lamp is the transient period during which the electrical characteristics of the high-pressure discharge lamp continue to change after starting the high-pressure discharge lamp until stable lighting, and the high-pressure discharge lamp with sufficient time after starting. The electrical characteristics of the discharge lamp are determined from the electrical characteristics of the discharge lamp with the stable period, which is a period in which the electrical characteristics are substantially stable, and the electrical characteristics of the transient period in which the electrical characteristics of the high pressure discharge lamp continue to change are the characteristics of the high pressure discharge lamp. Is the rate of change of the discharge lamp voltage, The electrical characteristics between periodic, the change rate of the discharge lamp voltage when is lit by direct current as when is lit at a low frequency of several tens to several hundred Hz in a predetermined power, based on the determined result A discharge lamp lighting device that controls power supplied to the power conversion circuit to light a connected high-pressure discharge lamp. A power conversion circuit that converts power from a DC power source to supply power to the high-pressure discharge lamp, a lighting control circuit that controls the power supplied to the power conversion circuit, and the discharge lamp's rated power A discharge lamp lighting circuit comprising: a discharge lamp discriminating circuit for discriminating a species; a discharge lamp lighting device for lighting a high-pressure discharge lamp of a plurality of rated power types connected to one of them; The rated power type of the lamp is the transient period during which the electrical characteristics of the high-pressure discharge lamp continue to change after starting the high-pressure discharge lamp until stable lighting, and the high-pressure discharge lamp with sufficient time after starting. The electrical characteristics of the discharge lamp are determined from the electrical characteristics of the discharge lamp with the stable period, which is a period in which the electrical characteristics are substantially stable, and the electrical characteristics of the transient period in which the electrical characteristics of the high pressure discharge lamp continue to change are the characteristics of the high pressure discharge lamp. Is the rate of change of the discharge lamp voltage, The electrical characteristics between periodic, the change rate of the discharge lamp voltage when lit smallest range of rated power the largest power rating of the plurality of types of discharge lamps, based on the determined result, the power A discharge lamp lighting device characterized by controlling power supplied to a conversion circuit and lighting a connected high-pressure discharge lamp. A power conversion circuit that converts power from a DC power source to supply power to the high-pressure discharge lamp, a lighting control circuit that controls the power supplied to the power conversion circuit, and the discharge lamp's rated power A discharge lamp lighting circuit comprising: a discharge lamp discriminating circuit for discriminating a species; a discharge lamp lighting device for lighting a high-pressure discharge lamp of a plurality of rated power types connected to one of them; The rated power type of the lamp is the transient period during which the electrical characteristics of the high-pressure discharge lamp continue to change after starting the high-pressure discharge lamp until stable lighting, and the high-pressure discharge lamp with sufficient time after starting. The electrical characteristics of the discharge lamp are determined from the electrical characteristics of the discharge lamp with the stable period, which is a period in which the electrical characteristics are substantially stable, and the electrical characteristics of the transient period in which the electrical characteristics of the high pressure discharge lamp continue to change are the characteristics of the high pressure discharge lamp. Is the rate of change of the discharge lamp voltage, The rate of change of the discharge lamp voltage when the electrical characteristic between regular, which is lit by direct current as when is lit at a low frequency of several tens to several hundred Hz smallest rated power or less among the plurality of types of discharge lamps A discharge lamp lighting device characterized in that, based on the determined result, the power supplied to the power conversion circuit is controlled to light a connected high-pressure discharge lamp. A power conversion circuit that converts power from a DC power source to supply power to the high-pressure discharge lamp, a lighting control circuit that controls the power supplied to the power conversion circuit, and the discharge lamp's rated power A discharge lamp lighting circuit comprising: a discharge lamp discriminating circuit for discriminating a species; a discharge lamp lighting device for lighting a high-pressure discharge lamp of a plurality of rated power types connected to one of them; The rated power type of the lamp is the transient period during which the electrical characteristics of the high-pressure discharge lamp continue to change after starting the high-pressure discharge lamp until stable lighting, and the high-pressure discharge lamp with sufficient time after starting. The electrical characteristics of the discharge lamp are determined from the electrical characteristics of the discharge lamp with the stable period, which is a period in which the electrical characteristics are substantially stable, and the electrical characteristics of the transient period in which the electrical characteristics of the high pressure discharge lamp continue to change are the characteristics of the high pressure discharge lamp. Is the rate of change of the discharge lamp voltage, The electrical characteristics between periodic, the change rate of the discharge lamp voltage obtained when is lit by two or more predetermined power, said the two or more predetermined power, the more discharge lamps in The smallest rated power and a power that is even smaller than the smallest rated power , and based on the determined result, the power supplied to the power conversion circuit is controlled, and the connected high-pressure discharge lamp is turned on. A discharge lamp lighting device. In any one of claims 1-4, stable electrical characteristics between the time of lighting the discharge lamp voltage when is lit at a low frequency of several tens to several hundred Hz smallest rated power among the plurality of types of discharge lamps And a discharge lamp voltage when lighting at a low frequency of several tens to several hundreds Hz with a power smaller than the smallest rated power, and a discharge lamp voltage when lighting with a direct current below the smallest rated power. A discharge lamp lighting device having a value obtained in combination. A power conversion circuit that converts power from a DC power source to supply power to the high-pressure discharge lamp, a lighting control circuit that controls the power supplied to the power conversion circuit, and the discharge lamp's rated power A discharge lamp lighting circuit comprising: a discharge lamp discriminating circuit for discriminating a species; a discharge lamp lighting device for lighting a high-pressure discharge lamp of a plurality of rated power types connected to one of them; The rated power type of the lamp is the transient period during which the electrical characteristics of the high-pressure discharge lamp continue to change after starting the high-pressure discharge lamp until stable lighting, and the high-pressure discharge lamp with sufficient time after starting. The electrical characteristics of the discharge lamp are determined from the electrical characteristics of the discharge lamp with the stable period, which is a period in which the electrical characteristics are substantially stable, and the electrical characteristics of the transient period in which the electrical characteristics of the high pressure discharge lamp continue to change are the characteristics of the high pressure discharge lamp. Is the rate of change of the discharge lamp voltage, The electrical characteristics between periodic smallest and the discharge lamp voltage when is lit at a low frequency of several tens to several hundred Hz at rated power, the smallest smaller power than the rated power in a plurality of types of discharge lamps This is a value obtained by combining the discharge lamp voltage when lit at a low frequency of several tens to several hundred Hz and the discharge lamp voltage when lit with a direct current at the lowest rated power or less. The discharge lamp lighting device characterized in that, based on the result, the power supplied to the power conversion circuit is controlled to light the connected high-pressure discharge lamp. In claim 1 , the rate of change of the discharge lamp voltage during the transition period is a time required for a change from V1 to V2 at preset discharge lamp voltages V1 and V2 (V1 <V2). Electric light lighting device. In claim 1 , the change rate of the discharge lamp voltage during the transition period is obtained by dividing the difference between the preset discharge lamp voltages V1 and V2 (V1 <V2) by the time required for the change from V1 to V2. The discharge lamp lighting device characterized by the above-mentioned value. A power conversion circuit that converts power from a DC power source to supply power to the high-pressure discharge lamp, a lighting control circuit that controls the power supplied to the power conversion circuit, and the discharge lamp's rated power A discharge lamp lighting circuit comprising: a discharge lamp discriminating circuit for discriminating a species; a discharge lamp lighting device for lighting a high-pressure discharge lamp of a plurality of rated power types connected to one of them; The rated power type of the lamp is the transient period during which the electrical characteristics of the high-pressure discharge lamp continue to change after starting the high-pressure discharge lamp until stable lighting, and the high-pressure discharge lamp with sufficient time after starting. The electrical characteristics of the discharge lamp are determined from the electrical characteristics of the discharge lamp with the stable period, which is a period in which the electrical characteristics are substantially stable, and the electrical characteristics of the transient period in which the electrical characteristics of the high pressure discharge lamp continue to change are a rate of change of the discharge lamp voltage, The rate of change of the discharge lamp voltage during the transfer period is obtained by detecting discharge lamp voltages in the range of preset discharge lamp voltages V1 and V2 (V1 <V2) at regular intervals and integrating the detected voltages. The electrical characteristic of the stable period is a discharge lamp voltage when the lamp is lit with a predetermined power. Based on the determined result, the supply power of the power conversion circuit is controlled, and the connected high voltage A discharge lamp lighting device characterized by lighting a discharge lamp. In claim 1 , the rate of change of the discharge lamp voltage during the transition period means that the discharge lamp voltage in the range of preset discharge lamp voltages V1, V2 (V1 <V2) is detected at regular intervals, and the detected voltage is A discharge lamp lighting device having a value obtained by integration. 10. The discharge lamp lighting device according to claim 9, wherein the electrical characteristic of the stable period is a rate of change of the discharge lamp voltage obtained when the lamp is lit with two or more predetermined powers. A power conversion circuit that converts power from a DC power source to supply power to the high-pressure discharge lamp, a lighting control circuit that controls the power supplied to the power conversion circuit, and the discharge lamp's rated power A discharge lamp lighting circuit comprising: a discharge lamp discriminating circuit for discriminating a species; a discharge lamp lighting device for lighting a high-pressure discharge lamp of a plurality of rated power types connected to one of them; The rated power type of the lamp is the transient period during which the electrical characteristics of the high-pressure discharge lamp continue to change after starting the high-pressure discharge lamp until stable lighting, and the high-pressure discharge lamp with sufficient time after starting. The electrical characteristics of the discharge lamp are determined from the electrical characteristics of the discharge lamp with the stable period, which is a period in which the electrical characteristics are substantially stable, and the electrical characteristics of the transient period in which the electrical characteristics of the high pressure discharge lamp continue to change are the characteristics of the high pressure discharge lamp. Is the rate of change of the discharge lamp voltage, The electrical characteristics between periodic, the change rate of the discharge lamp voltage obtained when is lit by two or more predetermined power, and the change rate of the discharge lamp voltage, the two power W1, W2 (W1> W2) is a value obtained by detecting the discharge lamp voltage in the range of the discharge lamp voltages V3 and V4 at regular intervals and integrating the detected voltages. Based on the determined result, the power A discharge lamp lighting device characterized by controlling power supplied to a conversion circuit and lighting a connected high-pressure discharge lamp. In any one of claims 2 or 4, the change rate of the discharge lamp voltage, two power W1, W2 (W1> W2) discharging lamp voltage V3, V4 predetermined time discharge lamp voltage in the range of when lit A discharge lamp lighting device characterized in that it is a value obtained by detecting each time and integrating the detected voltages. An illumination device comprising the discharge lamp lighting device according to any one of claims 1 to 13 .

Images