JP2013025923A - High-pressure discharge lamp lighting device, method of lighting high-pressure discharge lamp using the same and lighting equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-pressure discharge lamp lighting device having plural adaptable lamps that can identify the specification of a high-pressure discharge lamp connected thereto just after lighting of the high-pressure discharge lamp is started.SOLUTION: A high-pressure discharge lamp lighting device has a current supply circuit for supplying current to a high-pressure discharge lamp connected thereto, a controller for controlling output current of the current supply circuit and a lamp voltage detection circuit for detecting the lamp voltage of the high-pressure discharge lamp. The controller controls the current supply circuit so that the output current has a base current portion and a temporary peak current portion having a higher current value than the base current portion, specifies the specification of a high-pressure discharge lamp connected to the lighting device from a lamp voltage parameter corresponding to the peak current portion, and outputs the output current set for the high-pressure discharge lamp having the specified specification to the current supply circuit.

Description

  The present invention relates to a high-pressure discharge lamp lighting device, and more specifically to a high-pressure discharge lamp lighting device having a plurality of high-pressure discharge lamps as compatible lamps, a high-pressure discharge lamp lighting method using the same, and a lighting fixture.

  Conventionally, dedicated high-pressure discharge lamp lighting devices (hereinafter referred to as “lighting devices”) have been used to light high-pressure discharge lamps of different types or different rated powers. For example, in the case of a high-pressure discharge lamp with a rated power of around 100 W, there are types of metal halide lamps, high-pressure sodium lamps, etc., and high-pressure discharge lamps with a rated power of 70 W, 100 W, 150 W, etc., and a dedicated lighting device for each combination Was used. In addition, lighting of high-voltage discharge lamps of multiple types or rated power is possible due to demands for cost reduction by reducing lighting device development costs and inventory types, and adjustment of illuminance and light color by changing lamp types after installation of lighting devices. There is a need for a lighting device that can do this.

  In Patent Document 1, for a high-pressure discharge lamp connected to a lighting device, the rated power of the high-pressure discharge lamp is determined by looking at the rate of change of the lamp voltage in a predetermined period after the start of lighting, and selected based on the determination result There has been disclosed a lighting device for lighting a high pressure discharge lamp according to the output characteristics.

JP 2005-310676 A

  In general, a high-pressure discharge lamp gradually increases in lamp voltage after starting lighting, and takes several minutes to ten and several minutes to reach stable lighting (lighting at rated power). In the case of lighting with a lighting device corresponding to a plurality of rated powers such as Patent Document 1, if a lamp current greater than the lamp current allowed for the connected high-pressure discharge lamp is input, the high-pressure discharge lamp is damaged. Until the determination of the rated power of the connected high-pressure discharge lamp is completed, the high-pressure discharge lamp with the lowest allowable lamp current among the high-pressure discharge lamps that are expected to be connected (hereinafter referred to as “compatible lamps”) (usually, The lamp current is supplied in accordance with the high-pressure discharge lamp with the lowest rated power. Therefore, if the connected high-pressure discharge lamp is other than the high-pressure discharge lamp with the lowest rated power among the compatible lamps, it will start lighting at a lower current than when it is lit with a dedicated lighting device, and the luminous flux rises. Is delayed, that is, it takes a longer time to reach stable lighting.

  Further, although Patent Document 1 discloses a method for determining the rated power of metal halide lamps having different rated powers, the difference between the types of high-pressure discharge lamps having different additives such as metal halide lamps and high-pressure sodium lamps is determined. The method of doing is not disclosed.

  Therefore, the present invention determines the specification (type, rated power, or type and rated power) of the connected high-pressure discharge lamp immediately after the lighting of the high-pressure discharge lamp is started in a high-pressure discharge lamp lighting device having a plurality of compatible lamps. For the purpose.

  A first aspect of the present invention is a high pressure discharge lamp lighting device using a high pressure discharge lamp of a plurality of specifications as a compatible lamp, a current supply circuit for supplying current to the connected high pressure discharge lamp, and an output of the current supply circuit A control unit for controlling the current and a lamp voltage detection circuit for detecting the lamp voltage of the high-pressure discharge lamp are provided, and the control unit has a base current portion and a temporary peak current portion having a current value higher than that of the base current portion. The current supply circuit is controlled to have the specification of the connected high-pressure discharge lamp from the lamp voltage parameter corresponding to the peak current portion, and the output current set for the high-pressure discharge lamp of the specified specification is determined. A high pressure discharge lamp lighting device configured to output to a current supply circuit.

  According to a second aspect of the present invention, there is provided a current supply circuit for supplying a current to a connected high pressure discharge lamp, a control unit for controlling an output current of the current supply circuit, and a lamp voltage detection circuit for detecting a lamp voltage of the high pressure discharge lamp. A high pressure discharge lamp lighting method using a high pressure discharge lamp lighting device having a high-pressure discharge lamp of a plurality of specifications provided as a compatible lamp, wherein the control unit has a current value higher than the base current portion and the base current portion. A step of outputting an initial current having a temporary peak current portion to a current supply circuit; a step of determining a specification of a connected high-pressure discharge lamp from a lamp voltage parameter corresponding to the peak current portion; and a high voltage of the determined specification The lighting method includes a step of causing a current supply circuit to output an output current set for the discharge lamp.

In the first and second aspects, the lamp voltage parameter may be a ratio of the lamp voltage during the peak current portion to the lamp voltage during the base current portion.
When the current supply circuit is an AC current supply circuit and the polarity of the peak current portion and the base current portion immediately after that is different, the polarity of the ramp voltage parameter is reversed from the peak current portion to the base current portion. The overshoot amount or undershoot amount of the lamp voltage at the time may be used.
Alternatively, the lamp voltage parameter may be the rate of change of the lamp voltage during the peak current period.

  Further, with the current supply circuit as an AC current supply circuit, one unit of output current is composed of a half cycle base current portion and a one cycle high frequency current portion having a higher frequency than the base current portion. At least the latter half cycle may be the peak current portion.

  According to a third aspect of the present invention, there is provided a lighting apparatus including the high pressure discharge lamp lighting device according to the first aspect, a high pressure discharge lamp that is one of the compatible lamps, and a reflector to which the high pressure discharge lamp is attached.

It is a circuit block diagram of the high pressure discharge lamp lighting device by the Example of this invention. It is a figure which shows an example of the output current of the high pressure discharge lamp lighting device in the Example of this invention. It is a figure which shows an example of the output current of the high pressure discharge lamp lighting device in the Example of this invention. It is a figure which shows an example of the output current of the high pressure discharge lamp lighting device in the Example of this invention. It is a figure which shows an example of the output current of the high pressure discharge lamp lighting device in the Example of this invention. It is a figure which shows an example of the output current of the high pressure discharge lamp lighting device in the Example of this invention. It is a figure explaining the high pressure discharge lamp lighting device by the example of the present invention. It is a figure which shows the lamp current of the 70W metal halide lamp in the Example of this invention. It is a figure which shows the lamp voltage corresponding to FIG. 4A. It is a figure which shows the lamp current of the 150W metal halide lamp in the Example of this invention. It is a figure which shows the lamp voltage corresponding to FIG. 5A. It is a figure which shows the lamp current of the 150W high pressure sodium lamp in the Example of this invention. It is a figure which shows the lamp voltage corresponding to FIG. 6A. It is a flowchart of the lighting method of this invention. It is a figure of the lighting fixture in the Example of this invention.

  FIG. 1 shows a circuit configuration of a high pressure discharge lamp lighting device (hereinafter referred to as “lighting device”) according to an embodiment of the present invention. The lighting device includes a rectifying / smoothing circuit 10 that converts AC input into direct current, a step-down chopper circuit 20 that reduces the output voltage of the rectifying / smoothing circuit 10 and limits a current to a high-pressure discharge lamp (hereinafter referred to as “lamp”) 60, and a step-down circuit. It comprises a full bridge circuit 40 that converts the output of the chopper circuit 20 into an alternating current and puts it into the lamp 60, a step-down chopper circuit 20 and a control circuit 30 that controls the full bridge circuit 40, and an igniter 50. In the present specification, a portion including the rectifying / smoothing circuit 10, the step-down chopper circuit 20, and the full bridge circuit 40 is referred to as a current supply circuit. However, when a DC voltage is supplied from the outside of the lighting device, the rectifying and smoothing circuit 10 is not necessary. In this case, a portion including the circuit 20 and the full bridge circuit 40 is referred to as a current supply circuit.

  The step-down chopper circuit 20 is PWM-controlled by the control circuit 30 so that the lamp current becomes a predetermined value during a predetermined period after starting lighting and before reaching stable lighting. Specifically, the transistor 21 is PWM-controlled by the PWM control circuit 34 so that the lamp current detected by the lamp current detection resistor 33 matches the set value stored in the processor (microcomputer) 35. Thereby, a lamp current having a desired current value or current value variation can be generated.

  After the predetermined period, the step-down chopper circuit 20 is PWM-controlled by the control circuit 30 so that the lamp power becomes a predetermined value. Specifically, the product of the lamp voltage detected by the lamp voltage detection resistors 31 and 32 (lamp voltage detection circuit) and the lamp current detected by the lamp current detection resistor 33 (that is, lamp power) is stored in the processor 35. The transistor 21 is PWM controlled by the PWM control circuit 34 so as to match the set value.

  In the full bridge circuit 40, the bridge control circuit 45 alternately turns on and off the transistors 41 and 44 and the transistors 42 and 43 at the inversion timing set in the processor 35. Thereby, a lamp current waveform whose polarity is switched at a desired inversion timing can be formed.

  Note that the igniter circuit 50 operates at the time of starting the lamp, and enters a non-operating state after starting the lamp lighting. The present invention relates to the operation after the start of lamp lighting, and the operation of the igniter circuit 50 is not the essence of the invention, so that the description thereof is omitted.

  From the above, the current supply circuit controls the output current value of the step-down chopper circuit 20 by the processor 35, the PWM control circuit 34, and the bridge control circuit 45 (hereinafter, these three components are collectively referred to as a “control unit”). At the same time, by controlling the polarity inversion timing of the full bridge circuit 40, an output current having a desired waveform can be input to the lamp 60.

  In an embodiment of the present invention, the control unit controls the current supply circuit so that the output current has a base current portion and a temporary peak current portion having a current value higher than that of the base current portion. The specification of the connected high pressure discharge lamp is specified from the lamp voltage parameter corresponding to, and the output current set for the specified high pressure discharge lamp is output to the current supply circuit. The frequency of the base current portion is assumed to be about 50 Hz to 1 kHz. Further, in the present invention, the “specification” of the high pressure discharge lamp refers to any of the type, rated power, or type and rated power of the high pressure discharge lamp.

2A to 2E show output current waveforms used in the embodiment of the present invention.
In the output current waveform of FIG. 2A, one unit of output current is composed of a half cycle base current portion and a one cycle high frequency current portion having a higher frequency than the base current portion, and the latter half of the one cycle high frequency current portion. The cycle constitutes a peak current portion that is higher than the base current portion. The frequency of the high frequency current portion is assumed to be about 500 Hz to 10 kHz.

  2A shows a waveform in which the latter half cycle of the high-frequency current portion of one cycle is a peak current portion higher than the base current portion, but as shown in FIG. 2D, the first half and the latter half of the high-frequency current portion of one cycle are shown. The half cycle may be a waveform having a peak current portion higher than the base current portion.

In the output current waveform of FIG. 2B, one unit of output current consists of a base current portion of a half cycle and a peak current portion superimposed on the base current portion.
In the output current waveform of FIG. 2C, one unit of output current consists of a base current portion of one cycle or more and a peak current portion of a half cycle.
2A to 2D show an example for AC lighting, the present invention can also be applied to a DC lighting system, and a lamp current waveform as shown in FIG. 2E can be used. In the case of the direct current lighting method, a circuit configuration in which the full bridge circuit 40 is omitted from the circuit configuration in FIG. 1 may be used.

  FIG. 3 shows a set lamp current with respect to a lamp voltage in a 70 W metal halide lamp, a 150 W metal halide lamp, and a 150 W high pressure sodium lamp, respectively. For 70W metal halide lamp, 150W metal halide lamp and 150W high pressure sodium lamp, the effective values of initial current at the start-up in the state where the lamp voltage is low immediately after the start of lighting are recommended to be 1.5A, 3.0A and 3.3A, respectively. . In addition, the rated current at the time of stable lighting of each high pressure discharge lamp is 0.78A, 1.58A, and 1.50A, respectively.

In metal halide lamps, it is recommended that the initial current be less than twice the rated current in order to suppress damage to the lamp arc tube. On the other hand, in the high pressure sodium lamp, if the initial current is less than twice, the arc tube temperature does not increase, and the sodium inside the arc tube does not evaporate, so the lamp voltage may not rise forever. Therefore, in the high pressure sodium lamp, the initial current needs to flow a current larger than twice the rated current.
Note that the curve portion (high lamp voltage side) of each set lamp current in FIG. 3 means that constant power control is performed in the current supply circuit (particularly, the step-down chopper circuit 20). It is assumed that the constant current control corresponding to the linear portion (low lamp voltage side) of the lamp current is performed.

  4A, 5A, and 6A are lamp current waveforms when the output current of FIG. 2A is applied to a 70 W metal halide lamp, a 150 W metal halide lamp, and a 150 W high pressure sodium lamp, respectively. When discriminating the above three specifications of the high-pressure discharge lamp, before completion of the lamp specification discrimination, in order to eliminate damage to the lamp, the initial lamp current for the 70 W metal halide lamp having the smallest rated current among these compatible lamps is used. Is desirable. Therefore, the current waveforms in FIGS. 4A, 5A, and 6A have substantially the same waveform with an effective value of 1.5 A, a base current value of about 1.0 A, and a peak value of about 3.5 A.

  Note that the output current waveform of FIG. 2A is used because the peak current period can be set shorter than the base current period, so that the ratio between the effective value and the peak value of the current can be increased, and before and after the peak current. This is because the current difference at the time of current reversal becomes large, so that it becomes easy to identify the transient response of the lamp voltage described later.

  FIGS. 4B, 5B and 6B are the waveform of the lamp voltage of the 70 W metal halide lamp, 150 W metal halide lamp and 150 W high pressure sodium lamp corresponding to the lamp currents of FIGS. 4A, 5A and 6A, respectively. An example of a lamp specification discrimination method will be described below.

Example 1.
In the discrimination method of the first embodiment, the ratio of the ramp voltage parameter (hereinafter referred to as “base voltage”) to the ramp voltage (hereinafter referred to as “base voltage”) during the peak current portion is determined as the ratio of the lamp voltage parameter. It is what.
4B, 5B, and 6B, the ratio of the peak voltage to the base voltage is markedly different in the order of 70 W metal halide lamp, 150 W metal halide lamp, and 150 W high-pressure sodium lamp in order of about 2 times, about 3 times, and about 1.2 times. . Therefore, the processor 35 can specify the lamp specification based on this ratio.

  Since the present embodiment only needs to detect the ratio of the peak voltage to the base voltage, it can be implemented with all the output current waveforms of FIGS.

In the discrimination method according to the second embodiment, the lamp voltage parameter is set to an overshoot amount or an undershoot amount of the lamp voltage when the current is inverted from the peak current portion to the base current portion.
4B, 5B, and 6B, the overshoot amount of the lamp voltage (see each part A) is about 5V, about 20V, about −several V (in the order of 70W metal halide lamp, 150W metal halide lamp, and 150W high pressure sodium lamp). That is, there is a significant difference from undershoot). Therefore, the processor 35 can specify the lamp specification based on the overshoot amount.

  Since this embodiment requires inversion immediately after the peak current, it can be implemented with the output current waveforms of FIGS. 2A, 2C and 2D. Further, even in the case of the current waveform of the type shown in FIG. 2B, this embodiment can be implemented if the peak current portion is superimposed on the end of the base current portion.

Example 3
In the discrimination method of the third embodiment, the lamp voltage parameter is the rate of change of the lamp voltage during the peak current period.
4B, 5B, and 6B, the rate of change of the lamp voltage during the peak current period is about −8 V / t in the order of a 70 W metal halide lamp, a 150 W metal halide lamp, and a 150 W high pressure sodium lamp, where t is the peak current period. About -12 / t and about -1 V / t. Therefore, the processor 35 can specify the lamp specification based on this rate of change.

  Since the present embodiment only needs to be able to detect the variation in the lamp voltage immediately after the peak current, it can be implemented with all the output current waveforms of FIGS. However, if there is a significant difference with respect to the peak current portion immediately after polarity reversal, the output current waveforms of FIGS. 2A, 2C, and 2D are preferable, and the output current waveform of FIG. 2D is more preferable.

  Furthermore, in order to increase the discrimination accuracy, the first to third embodiments may be combined as appropriate, or any one of the first to third embodiments may be performed on each current waveform while switching the output current waveform, and the lamp specifications may be changed. It may be determined. It is assumed that each lamp voltage parameter corresponding to each lamp is stored in advance in a memory in the processor 35.

FIG. 7 is a flowchart showing a method for lighting a high pressure discharge lamp according to an embodiment of the present invention.
In step S1, the control unit causes the current supply circuit to output an initial current having a base current portion and a temporary peak current portion having a current value higher than that of the base current portion. That is, the current supply circuit inputs an output current having a waveform as shown in FIGS. 2A to 2D to the lamp 60 as an initial current. As described above, the control unit selects the initial current set for the lamp with the smallest rated current among the compatible lamps as the set current. In the specific example shown in the embodiment, an effective value of 1.5 A for a 70 W metal halide lamp is selected.

  In step S2, the control unit determines the specification of the connected lamp from the lamp voltage parameter corresponding to the peak current portion. Specifically, as shown in the first to third embodiments, the ratio of the peak voltage to the base voltage, the overshoot amount or the undershoot amount of the lamp voltage when the current is inverted from the peak current portion to the base current portion, or the lamp voltage. The lamp specifications are determined using the parameter as the lamp voltage change rate during the peak current period, or a combination thereof as the lamp voltage parameter. The timing of this determination can be performed immediately after the start of lighting (but after the transition to arc discharge). However, step S2 may be executed after the lamp voltage rises to some extent while avoiding a transient state immediately after the start of lighting.

  In step S3, the control unit causes the current supply circuit to output the output current set for the lamp having the determined specification. For example, when it is determined that the connected lamp is a 70 W metal halide lamp, lighting with the initial current in step S1 is continued. On the other hand, when it is determined that the connected lamp is a 150 W metal halide lamp or a 150 W high pressure sodium lamp, the lamp is switched to lighting with an effective current value of 3.0 A or 3.3 A corresponding to the determined specification.

  As described above, according to the present invention, in a lighting device having a plurality of compatible lamps, the lamp specifications are set immediately after the start of lighting (for example, several seconds after the transition from glow discharge to arc discharge) or at an early stage after the start of lighting. Can be determined. Therefore, in a lighting device having a plurality of compatible lamps, even when a lamp having a high rated power is mounted among the compatible lamps, it is possible to ensure the luminous flux rising at the same speed as when the lamp is turned on by a dedicated lighting device. it can.

FIG. 8 shows a lighting fixture using the lighting device. The luminaire includes a reflector 72 to which the lamp 60 which is either the lighting device 71 or the compatible lamp is attached. Note that FIG. 8 schematically illustrates the lighting fixture of the present invention, and the dimensions, arrangement, and the like are not as illustrated.
According to the luminaire of the present invention, in a luminaire having a plurality of compatible lamps, even when a lamp with a high rated power is mounted among the compatible lamps, a stable lighting arrival time equivalent to that when a dedicated luminaire is used is obtained. Can be achieved.

Although the most preferred embodiment of the present invention has been described above, the present invention can be modified as follows without departing from the spirit of the present invention.
(1) Although the metal halide lamp and the high-pressure sodium lamp are used in the above embodiment, the present invention can be applied to other types of high-pressure discharge lamps such as a mercury-free lamp.

  (2) In the above-described embodiment, the configuration in which the current having the waveform as shown in FIGS. 2A to 2E is supplied to the lamp after the lamp specification is determined is shown. You may throw waves.

  (3) In the above embodiment, the base current portion and the peak current portion are periodically repeated as the initial current. However, the peak current portion may be inserted irregularly with respect to the base current portion. Good.

  (4) In the above embodiment, specific examples of the rectifying / smoothing circuit 10, the step-down chopper circuit 20, the control circuit 30, the full bridge circuit 40, and the igniter circuit 50 are shown, but these can achieve the functions described above. Other circuit configurations known to those skilled in the art may be used. For example, in FIG. 1, a so-called capacitor input type circuit is shown as the rectifying and smoothing circuit 10, but a boost chopper circuit (power factor correction circuit) may be used. Further, the step-down chopper circuit 20 may be a DC / DC converter having another configuration such as a forward type, as long as the DC output current can be controlled. Further, the full bridge circuit 40 may be a DC / AC converter having another configuration such as a push-pull type, as long as the polarity inversion control of the output current can be performed.

10. Rectifying and smoothing circuit 20. Step-down chopper circuit 30. Control circuits 31, 32. Lamp voltage detection resistor (lamp voltage detection circuit)
33. Lamp current detection resistor 34. PWM control circuit 35. Processor 40. Full bridge circuit 45. Bridge control circuit 60. High pressure discharge lamp
71. High pressure discharge lamp lighting device (lighting device)
72. Reflector

Claims (11)

A high-pressure discharge lamp lighting device using a high-pressure discharge lamp of a plurality of specifications as a compatible lamp, a current supply circuit for supplying a current to a connected high-pressure discharge lamp, a control unit for controlling an output current of the current supply circuit, and It has a lamp voltage detection circuit that detects the lamp voltage of the high-pressure discharge lamp,
The control unit controls the current supply circuit so that the output current has a base current portion and a temporary peak current portion having a current value higher than that of the base current portion, and a lamp voltage corresponding to the peak current portion. A high-pressure discharge lamp lighting device configured to specify a specification of the connected high-pressure discharge lamp from parameters and output an output current set for the high-pressure discharge lamp of the specified specification to the current supply circuit .   2. The high pressure discharge lamp lighting device according to claim 1, wherein the lamp voltage parameter is a ratio of a lamp voltage during the peak current portion to a lamp voltage during the base current portion.   The high-pressure discharge lamp lighting device according to claim 1, wherein the current supply circuit is an alternating current supply circuit, and when the polarity of the peak current portion and the base current portion immediately thereafter is different, the lamp voltage parameter is A high pressure discharge lamp lighting device that is an overshoot amount or an undershoot amount of a lamp voltage at the time of polarity reversal from a peak current portion to the base current portion.   2. The high pressure discharge lamp lighting device according to claim 1, wherein the lamp voltage parameter is a rate of change of the lamp voltage during the peak current portion.   2. The high pressure discharge lamp lighting device according to claim 1, wherein the current supply circuit is an alternating current supply circuit, and one unit of the output current has a higher frequency than the base current portion and the base current portion of a half cycle. A high pressure discharge lamp lighting device comprising a high frequency current portion of one cycle, wherein at least a half cycle of the high frequency current portion of the one cycle is a peak current portion. A plurality of specifications comprising a current supply circuit for supplying current to the connected high-pressure discharge lamp, a control unit for controlling the output current of the current supply circuit, and a lamp voltage detection circuit for detecting the lamp voltage of the high-pressure discharge lamp. A high pressure discharge lamp lighting method using a high pressure discharge lamp lighting device having a high pressure discharge lamp as a compatible lamp,
The control unit causing the current supply circuit to output an initial current having a base current portion and a temporary peak current portion having a current value higher than the base current portion;
A step of determining a specification of the connected high-pressure discharge lamp from a lamp voltage parameter corresponding to the peak current portion; and the control unit is set for the high-pressure discharge lamp of the determined specification. A lighting method comprising the step of outputting the output current to the current supply circuit.   The lighting method according to claim 6, wherein the lamp voltage parameter is a ratio of a lamp voltage during the peak current portion to a lamp voltage during the base current portion.   The lighting method according to claim 6, wherein when the output current is an alternating current and the polarity of the peak current portion is different from that of the base current portion immediately after the peak current portion, the lamp voltage parameter is changed from the peak current portion to the base. The lighting method, which is the amount of overshoot or undershoot of the lamp voltage at the time of polarity reversal to the current portion.   The lighting method according to claim 6, wherein the lamp voltage parameter is a rate of change of the lamp voltage during a period of the peak current portion.   7. The lighting method according to claim 6, wherein the output current is an alternating current, and one unit of the output current includes a half cycle of the base current portion and a one cycle high frequency current portion having a higher frequency than the base current portion. A lighting method in which at least the second half of the high-frequency current portion of one cycle is a peak current portion.   A lighting apparatus comprising: the high-pressure discharge lamp lighting device according to any one of claims 1 to 5; a high-pressure discharge lamp that is one of the compatible lamps; and a reflector to which the high-pressure discharge lamp is attached.

Images