JP2005050647A - Discharge lamp lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a discharge lamp lighting device which mounts a control under constraints for appropriate arrangement when mounting the control including a microcomputer and having a function for controlling a light output such as an initial illuminance collection function, and which can perform desired operation while diminishing problems of noise, mounting space, and the like. <P>SOLUTION: The discharge lamp lighting device allows a control 4 to control the light output of a discharge lamp La1 by controlling the oscillation frequency of an inverter control IC3 with a control signal output from the control 4. In the device, the inverter control IC3 is placed between a rectifier circuit 1 and an inverter circuit 2, the control 4 is placed near the inverter control IC3, and an external signal input from an external signal output 6 can change the output state of a control signal. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a discharge lamp lighting device capable of controlling the light output of a discharge lamp according to the lighting time of the discharge lamp or an external signal.

  FIG. 12 shows a general circuit diagram of a discharge lamp lighting device for lighting a discharge lamp. This circuit is provided with a rectifier DB1 composed of a diode bridge that receives commercial power supply voltage AC and rectifies it in full wave, and a series circuit of a switching element Q1 composed of a MOSFET and an inductor L1 is connected between its DC output terminals. The Further, a series circuit of a diode D1 and a smoothing capacitor C1 is connected between both ends of the switching element Q1, and the inverter circuit is driven using the smoothing capacitor C1 as a power source. The inverter circuit includes a series circuit of a pair of switching elements Q2 and Q3 composed of MOSFETs connected between both ends of the smoothing capacitor C1, and between the both ends of one switching element Q3, a DC cut capacitor C2 and a resonance circuit are provided. The series circuit of the inductor L2 and the discharge lamp La1 is connected. Further, a capacitor C3 that constitutes a resonance circuit together with the inductor L2 is connected between the non-power supply side terminals of both filaments F1 and F2 of the discharge lamp La1.

  The gate terminals of the switching elements Q1 to Q3 are connected to the inverter control IC3, and the switching elements Q1 to Q3 are turned on / off by a drive signal from the inverter control IC3. Here, after power-on, switching elements Q1-Q3 are turned on / off at high frequency, and switching elements Q2, Q3 are turned on / off alternately.

  The operation of such an inverter circuit is well known, and the output voltage from the rectifier DB1 is boosted by a boost chopper circuit composed of an inductor L1, a switching element Q1, a diode D1, and a smoothing capacitor C1, and the switching elements Q2, By alternately turning on / off Q3, an alternating current flows through the discharge lamp La1. Here, since the inductor L2 and the capacitor C3 exist in the power supply path to the discharge lamp La1, the discharge is determined according to the relationship between the switching period (operating frequency) of the switching elements Q2 and Q3 and the resonance frequency of the inductor L2 and the capacitor C3. The energy supplied to the electric lamp La1 can be adjusted, and the light output of the discharge lamp La1 can be changed.

  FIG. 13 shows a front view of a discharge lamp lighting device in which the inverter is mounted. In the figure, 1 is a rectifier circuit unit, 2 is an inverter circuit unit, 3 is an inverter control IC, and 5 is a set substrate. This type of discharge lamp lighting device is mainly used in facilities lighting equipment. In general, facilities lighting fixtures are very long in the lateral direction, as is obvious from an FHF32 or FLR110 lamp. For this reason, the ballast built in the appliance can be restricted in the lateral direction. Usually, a discharge lamp lighting device for facility lighting is generally rectangular. As described above, the discharge lamp lighting device includes the rectifier circuit unit 1 (chopper circuit), the inverter circuit unit 2, and the output terminal in this order from the input power supply terminal. Therefore, when mounting them, they are mounted in the above order. As shown in FIG. 13, in a substrate in which the distance in the width direction is very limited, the chopper choke L1 and the ballast choke L2 are large enough to be comparable to the size in the width direction of the substrate and are very difficult to mount. It becomes. For this reason, the chokes L1 and L2 are arranged over the full width of the substrate, and the switching elements Q1, Q2, Q3, the smoothing capacitor C1, and the chopper diode D1 are arranged before and after (longitudinal direction of the substrate).

  Further, the wiring distance between the inverter control IC 3 and the switching element Q1 of the rectifier circuit unit 1 (chopper circuit) and the wiring distance between the inverter control IC 3 and the switching elements Q2 and Q3 of the inverter circuit unit 2 are both reduced. It is necessary to consider. Therefore, the inverter control IC 3 is disposed between the switching element Q1 of the rectifier circuit unit 1 (chopper circuit) and the switching elements Q2 and Q3 of the inverter circuit unit 2. This is because, when noise is superimposed on the wiring pattern to the gate terminals of the switching elements Q1, Q2, and Q3 output from the inverter control IC 3, the switching elements malfunction and turn on. This is because there is a risk of a situation such as turning on.

(Conventional example 2)
In general, it is known that the luminous flux of a discharge lamp is higher than the rating immediately after the start of use, and thereafter decreases as the lighting time elapses (luminous flux decay). In the conventional example shown in FIG. 14, the inverter output is controlled to be lower than the rated value immediately after the start of use by utilizing the above characteristics, and the inverter output is controlled to increase in time according to the luminous flux decay curve of the discharge lamp. By keeping the light output from the beginning of use of the discharge lamp regardless of the lighting time, the light output is kept substantially constant as shown by the broken line, and the excess light output at the beginning of use is suppressed, thereby reducing the power consumption. This is a technology to save energy, which is called initial illumination correction. A discharge lamp lighting device having this function is already known (Japanese Patent Laid-Open No. 2001-15276).

In such a discharge lamp lighting device, it is required to measure and store the discharge lamp lighting time and to control the inverter output to change according to the lighting time, and in many cases, a microcomputer is mounted to easily do this. .
Patent Document 1 discloses a configuration in which a chopper circuit and an inverter circuit are mounted on a circular circuit board in an annular fluorescent lamp lighting device.
JP-A-11-257571

  In order to add the initial illuminance correction function as in Conventional Example 2 to the discharge lamp lighting device as in Conventional Example 1, the inverter control IC controls the discharge lamp by controlling the operating frequency of the inverter by an external signal input. It is necessary to be able to control the light output. Further, a means for measuring the lighting time, a control signal output to the inverter control IC, and a variable means are required. These can be easily realized by using a microcomputer as in Conventional Example 2.

  However, as in Conventional Example 1, the discharge lamp lighting device for facility lighting is often rectangular, and it is difficult to mount components such as a chopper choke and a ballast choke, and there are restrictions on the arrangement of the inverter control IC. . Among them, when mounting a microcomputer, a power supply circuit for operating the microcomputer, an oscillation circuit, a reset circuit, etc., depending on the arrangement, not only the above-mentioned restrictions cannot be satisfied, but also the signals between the microcomputer and the inverter control IC It is also conceivable that the control signal is destroyed due to noise superimposed on the wiring and the desired light output is not achieved.

  The present invention has been made in view of the above points, and an object of the present invention is to provide an appropriate controller when a control unit including a microcomputer having a light output control function such as an initial illuminance correction function is mounted. It is an object of the present invention to provide a discharge lamp lighting device that can perform a desired operation while reducing noise and mounting space problems by mounting with restrictions to be arranged.

  In order to solve the above problems, the present invention, as shown in FIGS. 1 to 5, a rectifier circuit unit 1 that converts a power supply voltage into a direct current, and a high-frequency discharge lamp that receives the direct current output of the rectifier circuit unit 1. Control signal output from the control unit 4, including an inverter circuit unit 2 that is lit at 1, an inverter control IC 3 that controls driving of the switching elements Q 2 and Q 3 of the inverter circuit unit 2, and a control unit 4 that outputs a control signal. Thus, in the discharge lamp lighting device in which the inverter control IC 3 can control the light output of the discharge lamp La 1 by controlling the oscillation frequency of the inverter, the inverter control IC 3 includes the rectifier circuit unit 1 and the inverter circuit unit 2. The control unit 4 is arranged in the vicinity of the inverter control IC 3 and the output state of the control signal is determined by an external signal input from the external signal output unit 6. And it is characterized in that it is capable Toggles.

  As described above, according to the present invention, since the inverter control IC is disposed between the rectifier circuit unit and the inverter circuit unit, the drive signal from the inverter control IC to the switching element of each circuit unit is affected by noise. Since the control unit is arranged in the vicinity of the inverter control IC, the control signal on the wiring from the control unit to the inverter control IC is not easily affected by noise, and is therefore input from the external signal output unit. When the output state of the control signal is switched by an external signal, a discharge lamp lighting device that can reliably perform a desired operation can be provided by receiving the external signal at the control unit.

  As shown in FIG. 1, the control unit 4 is disposed in the vicinity of the inverter control IC 3 and between the rectifier circuit unit 1 and the inverter control IC 3. When connecting an external signal output unit, the control unit 4 receives an external signal. Therefore, by arranging the wiring pattern as shown in FIG. 1, the wiring pattern of the external signal can be reduced, and the pattern design of the set substrate 5 can be facilitated. Further, since it can be made less susceptible to the influence of noise on the external signal, the possibility that the control unit 4 may fail to receive the external signal is remarkably reduced, and the control unit 4 outputs a wrong control signal and a desired light output is obtained. It is possible to eliminate the problem that it cannot be obtained. Further, if the control unit 4 is disposed, for example, between the inverter circuit unit 2 and the inverter control IC 3, the switching operation frequency of the inverter circuit unit 2 is not fixed and the oscillation voltage is high. Therefore, the influence of noise on the control unit 4 is also increased. Therefore, the arrangement between the rectifier circuit unit 1 and the inverter control IC 3 is better.

  The front view of the discharge lamp lighting device of Example 1 of this invention is shown in FIG. A circuit diagram thereof is shown in FIG. As shown in FIG. 2, the discharge lamp lighting device further includes a control unit 4 including a microcomputer in addition to the discharge lamp lighting device on which the rectifier circuit unit 1 (chopper circuit), the inverter circuit unit 2 and the inverter control IC 3 are mounted.

  The inverter control IC 3 turns on the discharge lamp La1 by switching the switching element Q1 of the rectifier circuit unit 1 (chopper circuit) and the switching elements Q2 and Q3 of the inverter circuit unit 2. The wiring pattern from the inverter control IC 3 to each of the switching elements Q1 to Q3 is such that both the switching elements Q1 of the rectifier circuit unit 1 (chopper circuit) and the switching elements Q2 and Q3 of the inverter circuit unit 2 are shortened. An inverter control IC 3 is disposed between the two.

  By the way, if this inverter control IC 3 can control the light output of the discharge lamp La1 by changing the operating frequency of the inverter by a control signal from the outside, illumination with a high added value such as the initial illuminance correction function described in the conventional example. Control can be performed, and if a microcomputer is used to output and change the control signal, it can be realized relatively easily. For that purpose, it is necessary to mount a control unit 4 including a microcomputer and peripheral control circuits such as an oscillation circuit, a power supply circuit, and a reset circuit for driving the microcomputer.

  When outputting a control signal from the control unit 4 to the inverter control IC 3, it is important to suppress the influence of noise due to switching of the rectifier circuit unit 1 (chopper circuit) and the inverter circuit unit 2 as much as possible. This is to avoid problems such as malfunction of the microcomputer due to noise and failure to obtain a desired light output due to noise superimposed on the control signal pattern.

  Therefore, by arranging the control unit 4 in the vicinity of the inverter control IC 3, the pattern of the control signal is shortened as much as possible, and the pattern becomes an antenna to prevent the noise from being easily picked up.

  In the present embodiment, the case where a chopper circuit is used as the rectifier circuit unit 1 has been described. However, the configuration in which the inverter control IC 3 is subject to the same restrictions is not limited to the present embodiment and provides the same effect. .

  In addition, the inverter control IC 3 and the control unit 4 are mounted on the set board 5 so that the front and back surfaces of the set board 5 are not inquired. The pattern can be shortened, and this embodiment can be applied. Therefore, you may arrange | position the control part 4 in the back side of the surface where the inverter control IC3 is arrange | positioned.

  In the present embodiment, an external signal output unit 6 is provided outside the discharge lamp lighting device of the first embodiment, and a control signal is switched by an external signal from the external signal output unit 6, and a circuit diagram as shown in FIG. It becomes. The external signal output unit 6 is assumed to be capable of detecting infrared rays emitted from a human body and outputting the presence of a person as a signal, such as a human body detection sensor. When using a human body detection sensor to implement a lighting fixture that switches between light output during human body detection and non-detection, the human body detection sensor will be installed outside the fixture, and will be wired and connected to the discharge lamp lighting device from there. It will be. If the position where the human body detection sensor is attached is the center of the fixture, the arrangement in the lighting fixture is as shown in FIG.

  As shown in FIG. 5, generally, the power supply hole 8 of the discharge lamp lighting device is often provided near the center of the lighting fixture. For this reason, when connecting to the discharge lamp lighting device described in the first embodiment, either the input side (power source side) or the output side (load side) of the set substrate 5 is used. When the position of the discharge lamp is considered, the input side (power supply side) of the discharge lamp lighting device is directed toward the center of the appliance. In this case, if the connection part of the human body detection sensor 7 is provided on the output side of the discharge lamp lighting device, the wiring from the human body detection sensor 7 to the connection part becomes very long and is easily affected by noise and the like.

  Therefore, it is desirable to provide a connection portion for connecting the external signal output unit 6 and the discharge lamp lighting device such as the human body detection sensor 7 on the input side of the discharge lamp lighting device. By doing in this way, the wiring which transmits an external signal can be shortened and it can become difficult to receive the influence of noise. In the figure, 9 is a case of a discharge lamp lighting device.

  Conventionally, there are luminaires that control the light output of a discharge lamp depending on the presence or absence of a person. However, they are configured as a block in which a human body detection sensor 7 and a control unit 4 are integrated. Then, it is realizable by taking out only the human body detection sensor 7 outside. In addition, the light output control of various discharge lamps can be realized by the control unit 4 without connecting the human body detection sensor 7.

  In the present embodiment, the external signal output unit 6 includes the human body detection sensor 7, transmits the human body detection information to the control unit 4, and the control unit 4 controls the control signal to change the light output. For example, a brightness sensor may be included, and the control unit 4 may control the control signal according to the amount of light incident on the sensor. Any means that can control the light output of the discharge lamp from the outside may be used.

In FIG. 5, the external signal output unit 6 is outside the lighting fixture, but may be outside or inside the lighting fixture outside the discharge lamp lighting device 9.
The form of the external signal may be a digital signal such as a pulse signal or a PWM signal, or an analog voltage signal. As long as the signal can be exchanged between the external signal output unit 6 and the control unit 4 Anything can be used.

  FIG. 6 is a main part circuit diagram of Embodiment 3 of the present invention. The present embodiment relates to the form of control signals from the control unit 4 to the inverter control IC 3. If the inverter control IC 3 can receive the PWM signal and control the inverter drive according to the width of the duty ratio, the microcomputer included in the control unit 4 may output the control signal using the PWM signal. Since many microcomputers can perform PWM output relatively easily, it is easy to create a program. However, when the inverter control IC 3 is composed only of analog logic, it is extremely difficult to read the duty width of the PWM signal.

  On the other hand, it is possible for the inverter control IC 3 to control inverter drive with an analog voltage signal. In such a case, the microcomputer may output the control signal with an analog signal voltage. However, when the analog voltage signal is output by the microcomputer, the microcomputer is equipped with a D / A converter, and the range of selection of the microcomputer is narrowed. In particular, there are very few low-cost microcomputers such as 4-bit microcomputers equipped with a D / A converter.

  In such a case, if the microcomputer of the control unit 4 outputs a control signal as a PWM signal and a circuit for smoothing the PWM signal is provided in the control unit 4 or in the vicinity of the inverter control IC 3, the above problem is solved. it can. In the example of FIG. 6, the PWM signal output from the microcomputer of the control unit 4 is converted into an analog voltage signal by a low-pass filter circuit including resistors R1 and R2 and a capacitor C4 and input to the inverter control IC3.

  A fourth embodiment of the present invention will be described with reference to FIGS. The present embodiment proposes that the control unit 4 be a hybrid IC. As described in the conventional example, in the case of an elongated rectangular substrate, the mounting space is very limited, and it is difficult to mount peripheral circuits such as a microcomputer and an oscillation circuit, a power supply circuit, and a reset circuit for driving the microcomputer. Come. Therefore, by adopting a hybrid IC as the control unit 4, it is not necessary to mount the microcomputer 41 and the peripheral circuit 42 on the set substrate 5, so that the mounting area can be remarkably reduced. In other words, since only the space for mounting the hybrid IC and the wiring space to the hybrid IC are required on the set substrate 5, it is not necessary to consider the space for mounting the microcomputer 41 and the peripheral circuit 42. Can be simple.

  The shape of the hybrid IC may be a SIL (single in line) type as shown in FIG. 7 or a DIP (dual in line) type as shown in FIG. In any case, it is not necessary to provide a mounting space for components such as a microcomputer on the set substrate 5 of the discharge lamp lighting device.

  Furthermore, the terminal part of the SIL type hybrid IC 40 may be bent as shown in FIG. 9 so as to be parallel to the outer shape of the case 9 in which the set substrate 5 is accommodated. In this way, the mounting location of the hybrid IC 40 can be provided near the end of the set substrate 5, and a large space can be provided in the case 9 of the discharge lamp lighting device, thereby increasing the degree of freedom in mounting design. Can do.

  In this embodiment, as shown in FIG. 10, the inverter control IC 3 and the control unit 4 are integrated as a hybrid IC 43. In this way, it goes without saying that the mounting design and the substrate pattern design can be simplified as compared with the fourth embodiment. Further, since the inverter control IC 3 and the control unit 4 are integrated, the pattern of the control signal can be extremely shortened, so that the influence of noise or the like can be further prevented.

In this embodiment, as shown in FIG. 11, the control unit 4 and the external signal output unit 6 are integrated as a hybrid IC 46. For example, if a human body detection sensor is mounted on the hybrid IC 46 and processing is performed so that only the human body detection sensor is exposed from the case 9 that houses the set substrate 5, it is necessary to provide the external signal output unit 6 outside the discharge lamp lighting device. There is no need for a connection for that. Of course, the wiring is eliminated, and the external signal can be transmitted between the external signal output unit 6 and the control unit 4 in a very short pattern on the hybrid IC 46, so that the influence of noise or the like can be further prevented.
The present invention may be implemented by appropriately combining the embodiments described above, and similarly produces the effects of the present invention.

  The present invention can be applied to, for example, a use of a discharge lamp lighting device for facility illumination. It can also be applied to the use of a discharge lamp lighting device for general homes or offices.

It is a front view which shows the best form for implementing this invention. It is a front view of Example 1 of the present invention. It is a circuit diagram of Example 1 of the present invention. It is a circuit diagram of Example 2 of the present invention. It is a front view which shows the mounting state to the lighting fixture of Example 2 of this invention. It is a principal part circuit diagram of Example 3 of this invention. It is a perspective view which shows the structural example of the control part of Example 4 of this invention. It is a perspective view which shows the other structural example of the control part of Example 4 of this invention. It is sectional drawing which shows an example of the mounting structure of the control part of Example 4 of this invention. It is a perspective view which shows the structural example of the control part of Example 5 of this invention. It is sectional drawing which shows an example of the mounting structure of the control part of Example 6 of this invention. FIG. 6 is a circuit diagram of Conventional Example 1. It is a front view of the prior art example 1. It is operation | movement explanatory drawing of the prior art example 2. FIG.

Explanation of symbols

1 Rectifier circuit part 2 Inverter circuit part 3 Inverter control IC
4 Control unit 5 Set board 6 External signal output unit 41 Microcomputer 42 Oscillator

Claims (8)

A rectifier circuit unit that converts a power supply voltage into a direct current; an inverter circuit unit that receives a direct current output from the rectifier circuit unit to light a discharge lamp at a high frequency; an inverter control IC that controls driving of a switching element of the inverter circuit unit; A discharge lamp lighting device including a control section that outputs a signal, and the control signal output from the control section allows the inverter control IC to control the light output of the discharge lamp by the control section by controlling the oscillation frequency of the inverter. The inverter control IC is disposed between the rectifier circuit unit and the inverter circuit unit, and the control unit is disposed in the vicinity of the inverter control IC, and the output state of the control signal is controlled by an external signal input from the external signal output unit. A discharge lamp lighting device characterized by being switchable. The external signal output unit is provided outside the discharge lamp lighting device, the control unit receives an external signal from the external signal output unit via the connection terminal, and the connection terminal is near the power input end of the discharge lamp lighting device. The discharge lamp lighting device according to claim 1, wherein the discharge lamp lighting device is arranged. 2. The discharge lamp lighting device according to claim 1, wherein the external signal output unit is provided inside the discharge lamp lighting device and is disposed in the vicinity of the control unit. The discharge lamp lighting device according to claim 1, wherein the control unit is disposed between the rectifier circuit unit and the inverter control IC. The discharge lamp lighting device according to any one of claims 1 to 4, wherein the control unit is a hybrid IC. 6. The discharge lamp lighting device according to claim 5, wherein the inverter control IC and the control unit are one hybrid IC in which both are mounted. The discharge lamp lighting device according to claim 5 or 6, wherein the hybrid IC is disposed obliquely from a board surface to be mounted.   8. The discharge lamp according to claim 1, wherein the control unit outputs a control signal to the inverter control IC so as to increase the light output of the discharge lamp according to the lighting time of the discharge lamp. Lighting device.

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