JP4668106B2 - Inverter control IC, discharge lamp lighting device, and illumination control system - Google Patents

Description

  The present invention includes a discharge lamp lighting device for lighting a discharge lamp by an inverter circuit unit, and includes an inverter control IC used for a discharge lamp lighting device having an initial illuminance correction function and a continuous light control function, and the inverter control IC. The present invention relates to a discharge lamp lighting device.

  FIG. 14 shows an example of a conventional discharge lamp lighting device (for example, Patent Document 1). The circuit configuration of FIG. 14 is disclosed in Patent Document 1 (FIGS. 3 and 4 of Patent Document 1), and is generally seen. When the initial illuminance correction function found in Patent Document 1 is mounted on a lighting inverter device (a discharge lamp lighting device having an inverter circuit unit), an increase in the area of a mounting substrate to which components of the discharge lamp lighting device are attached cannot be avoided. .

In addition, the lighting inverter device is greatly limited in shape due to the shape of the lamp (discharge lamp), and the size of the mounting substrate cannot be easily increased. In addition, forcibly packing the component parts in a narrow place on the mounting board causes an increase in cost, resulting in a problem that feasibility is poor. In addition to the initial illuminance correction function, there is also a demand to install a continuous light control function. When a continuous light control function is added to the discharge lamp lighting device that lights the discharge lamp in the inverter circuit unit in addition to the initial illuminance correction, it is more difficult to secure a space for mounting components.
JP 2005-50647 A

  This invention can suppress an increase in the area of a mounting board to which components are attached even when an initial illumination correction function and a continuous light control function are provided in a discharge lamp lighting device for lighting a discharge lamp by an inverter circuit unit. It is an object to provide a discharge lamp lighting device.

The inverter control IC of this invention is
A step-up chopper circuit for boosting a DC voltage including a pulsating component;
An oscillation operation of the inverter circuit unit of a discharge lamp lighting device comprising: an inverter circuit unit that converts a DC voltage boosted by the boost chopper circuit unit into a high frequency voltage by an oscillation operation and supplies the converted high frequency voltage to a discharge lamp. In an inverter control IC that is an IC to be controlled,
The semiconductor substrate includes a control unit that generates an inverter control signal for controlling the oscillation operation of the inverter circuit unit, and the light output of the discharge lamp according to the cumulative lighting time of the discharge lamp. An initial illuminance correction unit that performs initial illuminance correction that is a process to be controlled, and a dimming signal conversion unit that inputs a dimming signal for dimming the discharge lamp and converts the light into a predetermined signal are formed. The connection between the control unit and the initial illuminance correction unit and the connection between the control unit and the dimming signal conversion unit can be switched.

  According to the present invention, an increase in the area of the mounting substrate can be suppressed and a low-cost discharge lamp lighting device can be provided.

  Embodiments will be described below. The following embodiments are discharge lamp lighting devices that operate an inverter circuit unit by an inverter control IC, and have an “initial illuminance correction function” and a “continuous dimming function”. The present invention relates to a discharge lamp lighting device. In the discharge lamp lighting device described in the following embodiment, an initial illuminance correction unit 51 that executes an “initial illuminance correction function” and a dimming signal are input to the inverter control IC to obtain a brightness control signal described later. The “dimming I / F unit 52” to be converted is formed to be switchable.

  The initial illumination correction function and the continuous light control function will be described with reference to FIG. Since these are known techniques, they will be briefly described. In addition, although the following Embodiment 1-Embodiment 3 demonstrates continuous light control, the following Embodiment 1-Embodiment 3 are applicable similarly also with stepwise light control which is not continuous.

  First, “initial illuminance correction” is “a process for controlling the light output of the discharge lamp according to the cumulative lighting time of the discharge lamp”. FIG. 1A is a characteristic diagram showing the relationship between the cumulative lighting time (0 hours to 12000 hours) and the luminous flux when the electric power during lighting of the discharge lamp LA is constant. The horizontal axis indicates the cumulative lighting time of the discharge lamp LA, and the vertical axis indicates the luminous flux. As shown in FIG. 1A, the luminous flux of the discharge lamp LA decreases as the cumulative lighting time elapses. FIG. 1B is a diagram showing that the power of the discharge lamp LA is increased as the cumulative lighting time elapses. The horizontal axis indicates the cumulative lighting time, and the vertical axis indicates the power of the discharge lamp. In order to prevent the light quantity of the discharge lamp LA from decreasing with the cumulative lighting time, the power of the discharge lamp LA is suppressed to less than 100% of the total light when the cumulative lighting time is short as shown in FIG. However, the electric power of the discharge lamp LA is increased as the cumulative lighting time elapses (for example, 70%: 70% dimming). As a result of such control, as shown in FIG. 1C, the light output of the discharge lamp LA becomes substantially constant as the cumulative lighting time elapses. Such control of the light output of the discharge lamp is called “initial illumination correction”. The optical output is controlled by controlling the oscillation frequency of the inverter circuit section.

  “Continuous dimming control” refers to controlling the light output of the discharge lamp LA (increasing or decreasing the light output) while the discharge lamp LA is in use (for example, time T in FIG. 1B). Controlling the brightness of The light output control in “continuous dimming” is also performed by controlling the oscillation frequency of the inverter circuit unit, as in “initial illuminance correction”.

Embodiment 1 FIG.
The first embodiment will be described with reference to FIGS. In the first embodiment, an inverter control IC 50 which is a monolithic IC in which an initial illuminance correction unit 51 and a dimming I / F (Inter Face) unit 52 (a dimming signal conversion unit) are formed on a semiconductor substrate 90 in a switchable manner. The present invention relates to a discharge lamp lighting device using the above.

  FIG. 2 is a circuit diagram of the discharge lamp lighting device 100 according to the first embodiment. In FIG. 2, the configuration from the full-wave rectifier circuit 10 to the load circuit 40 is the same as the conventional example shown in FIG. The difference from the conventional example is the configuration of the inverter control IC 50.

  The discharge lamp lighting device 100 of FIG. 2 includes a full-wave rectifier circuit 10, a boost chopper circuit unit 20, an inverter circuit unit 30, a load circuit 40 to which a discharge lamp is attached, and an inverter control IC 50. The configuration from the full-wave rectifier circuit 10 to the load circuit 40 is the same as that of the conventional example shown in FIG. 12 as described above, but the discharge lamp lighting device 100 of FIG. The light control I / F unit 52, the switching circuit 53 (switching unit), and the control unit 54 are formed. The inverter control IC 50 is a monolithic IC that is composed of a single semiconductor substrate 90 and on which an initial illuminance correction unit 51, a dimming I / F unit 52, a switching circuit 53, a control unit 54, and the like are formed. It is a feature.

  Next, the full-wave rectifier circuit 10 to the load circuit 40 will be described. Since these are conventional techniques, they will be briefly described. The full-wave rectifier circuit 10 is a circuit that rectifies the commercial power source 1 into a DC power source including a pulsating component, and is realized by a diode bridge or the like. The step-up chopper circuit unit 20 boosts the DC voltage including the pulsating component. The inverter circuit unit 30 converts the DC voltage boosted by the boost chopper circuit unit 20 into a high frequency voltage by the oscillation operation of the switching elements Q2 and Q3, and supplies the converted high frequency voltage to the discharge lamp LA of the load circuit 40. The load circuit 40 is supplied with a high frequency voltage from the inverter circuit unit 30.

  Next, the inverter control IC 50 will be described. When the conventional discharge lamp lighting device having the “initial illuminance correction function” shown in FIG. 14 is equipped with a control unit including a microcomputer having a light output control function, due to noise and mounting space problems, There is a restriction on the arrangement of these components, and it is necessary to mount them on a separate substrate such as a hybrid IC. In this case, if the discharge lamp lighting device 100 in FIG. 2 is described, except for the initial illuminance correction unit 51, the configuration generally coincides with a configuration generally referred to as a continuous dimming inverter, and the difference is that a dimming signal is input from outside the continuous dimming inverter. In addition, only the dimming I / F (interface) unit 52 that converts the dimming control voltage is required (because it is not necessary for the initial illumination correction). That is, by replacing the initial illuminance correction unit 51 with the dimming I / F unit 52, the inverter with the initial illuminance function can be changed to a continuous dimming inverter. For this reason, in the inverter control IC 50 of FIG. 2, both the initial illuminance correction unit 51 and the dimming I / F unit 52 are built in, and the blocks can be switched by an external switching signal. The discharge lamp lighting device operates in the energy saving mode by the illuminance correction function and can operate as a continuous light control inverter as necessary.

  The inverter control IC 50 is an IC that controls the oscillation operation of the inverter circuit unit 30. The inverter control IC 50 is a monolithic IC composed of one semiconductor substrate 90. In FIG. 2, an initial illuminance correction unit 51, a dimming I / F unit 52 (a dimming signal conversion unit control unit), a switching circuit 53 (a switching unit), and a control unit 54 are formed on the semiconductor substrate 90. Is shown.

These functions are as follows.
(1) The control unit 54 generates an inverter control signal that controls the oscillation operation of the inverter circuit unit 30.
(2) The initial illuminance correction unit 51 executes an initial illuminance correction function and outputs a “brightness control signal” described later.
(3) The dimming I / F unit 52 inputs a dimming signal for dimming the discharge lamp LA, converts the input dimming signal into a “brightness control signal” (predetermined signal), which will be described later, and outputs it. To do.
(4) The switching circuit 53 is a “switching input” instructing one of the connection between the control unit 54 and the initial illuminance correction unit 51 and the connection between the control unit 54 and the dimming I / F unit 52. A connection instruction signal or a switching signal). Then, in accordance with the input “switching input”, the connection is switched between the connection between the control unit 54 and the initial illuminance correction unit 51 and the connection between the control unit 54 and the dimming I / F unit 52. As a result, either “brightness control signal” output from the initial illuminance correction unit 51 or “brightness control signal” output from the dimming I / F unit 52 is sent to the control unit 54. Entered. The control unit 54 generates and outputs an inverter control signal based on the input “brightness control signal”.

  FIG. 3 shows a circuit diagram of the discharge lamp lighting device 100a. The discharge lamp lighting device 100a in FIG. 3 differs from the discharge lamp lighting device 100 in FIG. 2 in that the configuration of the inverter control IC 50 is specifically shown and that a protection circuit 60 is provided. FIG. 3 shows an external switch SW1 that issues a switching input.

With reference to FIG. The inverter control IC 50 includes an initial illuminance correction unit 51, a dimming I / F unit 52, an analog switch 53a (switching unit), a control unit 54, a high withstand voltage driver unit 55 (drive circuit), and a power factor improvement. A functional unit 56 is formed on the semiconductor substrate 90. These functions are as follows.
(1) The power factor correction function unit 56 controls a power factor correction circuit (PFC) (not shown) that drives the boost chopper circuit unit 20.
(2) The high withstand voltage driver unit 55 receives an inverter control signal from the control unit 54, generates a drive signal for driving the inverter circuit unit 30 from the inverter control signal, and outputs the drive signal to the inverter circuit unit 30. 30 is driven.
(3) The control unit 54 controls the power factor improvement function unit 56 and the high breakdown voltage driver unit 55.
(4) The initial illuminance correction unit 51 performs initial illuminance correction and outputs a “brightness control signal”.
(5) The dimming I / F unit 52 controls the brightness of the discharge lamp LA by inputting a dimming signal from the outside, converting it to a predetermined signal (“brightness control signal”), and outputting it. To do.
(6) The analog switch 53a switches the “brightness control signal” from the initial illuminance correction unit 51 and the dimming I / F unit 52 by an external signal (switching input). Here, when the voltage input from the external switch SW1 is “H” (= Vcc), the analog switch 53a sends a signal from the initial illuminance correction unit 51 to the control unit 54, and when the voltage input is “L” (= GND). Sends a “brightness control signal”, which is an output from the dimming I / F unit 52, to the control unit 54. By operating the external switch SW1 in this way, the initial illumination correction function and the continuous light control function can be freely selected and used in one discharge lamp lighting device.

Next, the operation of the discharge lamp lighting device 100a in FIG. 3 will be described.
(1) Both the initial illuminance correction unit 51 and the dimming I / F unit 52 output a “brightness control signal”. In this case, when the initial illuminance correction unit 51 is connected to the control unit 54 by the analog switch 53a, the initial illuminance correction can be executed. Further, when the dimming I / F unit 52 is connected to the control unit 54 by the analog switch 53a, continuous dimming can be executed.
(2) Both the initial illuminance correction by the initial illuminance correction unit 51 and the continuous dimming by the dimming I / F unit 52 are the operating frequency of the inverter circuit unit 30, that is, the oscillation frequencies of the switching elements Q2 and Q3 of the inverter circuit unit 30. It is the same in that it controls.
(3) That is, the brightness of the discharge lamp LA is controlled by controlling the oscillation frequency of the switching elements Q2 and Q3 of the inverter circuit unit 30. Therefore, both the “brightness control signal” output from the initial illuminance correction unit 51 and the “brightness control signal” output from the dimming I / F unit 52 are output to the control unit 54 by the initial illuminance correction unit 51. There is no distinction as to whether the light control I / F unit 52 has output. The “brightness control signal” is a signal for causing the control unit 54 to create an inverter control signal for oscillating the switching elements Q2 and Q3 of the inverter circuit unit 30 at a frequency corresponding to the “brightness control signal”. is there.
(4) When the “brightness control signal” is input, the control unit 54 generates an inverter control signal for oscillating the switching elements Q2 and Q3 of the inverter circuit unit 30 at a frequency corresponding to the “brightness control signal”. Output to the high breakdown voltage driver section 55. The high breakdown voltage driver unit 55 receives an inverter control signal, generates a drive signal based on the input inverter control signal, and drives the switching elements Q2 and Q3 of the inverter circuit unit 30 by this drive signal.

  Next, the discharge lamp lighting device 100b of Embodiment 1 will be described with reference to FIG. The discharge lamp lighting device 100b includes a remote control receiving circuit 70a for the discharge lamp lighting device 100a, and is configured to switch the analog switch 53a by remote control operation.

The remote control 700 includes an operation unit 710 for continuous light control, and a selection switch 720 that can select either initial illuminance correction or continuous light control.
(1) When the user selects the initial illuminance correction function by the selection switch 720, the remote controller 700 transmits a remote control signal to connect the initial illuminance correction unit 51 to the control unit 54, and the user selects the continuous dimming function. In this case, the dimming I / F unit 52 transmits a remote control signal to be connected to the control unit 54.
(2) The remote controller 700 transmits a dimming signal when the user operates the operation unit 710 for the continuous dimming function.

The remote control receiving circuit 70a receives a remote control signal by a user's remote control operation.
(1) The remote control receiving circuit 70a switches between the initial illuminance correction function and the continuous light control function by sending a signal (connection instruction signal) to the analog switch 53a. When receiving a remote control signal for connecting the initial illuminance correction unit 51 to the control unit 54 from the remote control 700, the remote control reception circuit 70a outputs a connection switching signal to that effect to the analog switch 53a. Accordingly, the analog switch 53a connects the initial illuminance correction unit 51 and the control unit 54. Similarly, when the remote control receiving circuit 70a receives a remote control signal to connect the dimming I / F unit 52 to the control unit 54, it outputs a connection switching signal to that effect to the analog switch 53a. 53 a connects the dimming I / F unit 52 to the control unit 54.
(2) When a dimming signal is transmitted from the remote control 700 by the user selecting the continuous dimming function in the remote control 700, the remote control receiving circuit 70a receives the dimming signal transmitted from the remote control, The received dimming signal is sent to the dimming I / F unit 52. Thereafter, as described in the description of FIG. 3, the dimming I / F unit 52 converts the dimming signal into a “brightness control signal” and corresponds to the dimming level designated on the remote controller 700 side. The “brightness control signal” is sent to the control unit 54 via the analog switch 53a. Further, like the discharge lamp lighting device 100c shown in FIG. 5, the control unit 54 receives a signal from the remote control receiving circuit 70b, and the control unit 54 outputs a connection instruction signal to the analog switch 53a, or the control unit 54 adjusts. A configuration in which a control signal (dimming signal) is output to the optical I / F unit 52 may be employed.

  The discharge lamp lighting device according to the first embodiment includes the initial illuminance correction unit 51 and the dimming I / F unit 52 in the inverter control IC 50 and is configured to be able to switch both from the outside. The function can be made effective, an increase in the substrate area can be suppressed, and a low-cost discharge lamp lighting device can be realized.

  As described above, the discharge lamp lighting device of Embodiment 1 incorporates the initial illuminance correction function and the dimming I / F function for the continuous dimming inverter into the inverter control IC, and is integrated with the power factor correction circuit, the high withstand voltage driver, and the like. This makes it possible to reduce the size and cost of a discharge lamp lighting device having both an initial illuminance correction function and a continuous light control function.

Embodiment 2. FIG.
Next, the second embodiment will be described with reference to FIGS. The second embodiment relates to a discharge lamp lighting device that uses a dimming signal as a switching signal for the switching circuit 53.

  FIG. 6 is a circuit diagram of the discharge lamp lighting device 200 according to the second embodiment. The circuit configuration of the discharge lamp lighting device 200 differs from the discharge lamp lighting device 100 shown in FIG. 2 in that the inverter control IC 50 further includes a dimming signal determination unit 57. The inverter control IC 50 of the discharge lamp lighting device 200 incorporates both blocks of the initial illuminance correction unit 51 and the dimming I / F unit 52. The inverter control IC 50 inputs the dimming signal from the outside. When the dimming signal is input from the outside, the dimming signal determination unit 57 determines whether the dimming signal is a predetermined dimming signal. The “predetermined dimming signal” is a dimming signal that instructs the switching circuit 53 to connect to the initial illuminance correction unit 51 or a dimming that instructs to connect to the dimming I / F unit 52. Signal. When the dimming signal determination unit 57 determines that the dimming signal is a dimming signal indicating these, the dimming signal determination unit 57 outputs a connection instruction signal corresponding to the instruction to the switching circuit 53. The switching circuit 53 is connected to the initial illuminance correction unit 51 or the dimming I / F unit 52 according to the connection instruction signal. Thereby, the discharge lamp lighting device 200 normally operates in the energy saving mode by the initial illuminance correction function, and can be operated as a continuous dimming inverter by a predetermined dimming signal as necessary.

  Next, the configuration of the discharge lamp lighting device 200a in FIG. 7 will be described. The discharge lamp lighting device 200a in FIG. 7 specifically shows the configuration of the inverter control IC 50 of the discharge lamp lighting device 200 in FIG. The configuration of the discharge lamp lighting device 200a is such that the inverter control IC 50 of the discharge lamp lighting device 200a is compared with the inverter control IC 50 of the discharge lamp lighting device 100a with respect to the discharge lamp lighting device 100a of FIG. 57a. Other configurations are the same as those of the discharge lamp lighting device 100a.

  Next, the operation of the discharge lamp lighting device 200a in FIG. 7 will be described. As shown in FIG. 7, the dimming signal is input to both the dimming I / F unit 52 and the dimming signal determination unit 57a. The dimming signal determination unit 57a outputs “H” (connection instruction signal) to the analog switch 53a when the average value of the input dimming signals is equal to or less than a predetermined value. This operation is realized by the comparator 58 comparing the reference voltage source 59 with the average value of the dimming signal. When the “H” signal is input, the analog switch 53a switches to the initial illuminance correction unit 51 side. Thereby, when the average value of the light control signal is equal to or less than a certain value, the initial illuminance correction function can be made effective. When the average value of the dimming signal exceeds a certain value, the discharge lamp lighting device 200a can be operated as a continuous dimming inverter. Further, by using a window comparator or the like as the comparator 58, it is possible to perform an operation such as switching when the average value of the dimming signal is within a certain range.

Next, the configuration of the discharge lamp lighting device 200b in FIG. 8 will be described. The discharge lamp lighting device 200b of FIG. 8 is different from the discharge lamp lighting device 200a of FIG. 7 in that the function of the dimming signal determination unit 57a is changed, and the “dimming signal switching repeated detection circuit 57b-1” is provided. The light control signal determination unit 57b is configured. Other configurations are the same as those of the discharge lamp lighting device 200a of FIG.

  The operation of the discharge lamp lighting device 200b in FIG. 8 will be described. The “dimming signal switching repeat detection circuit 57b-1” of the dimming signal determination unit 57b outputs an “H” (High) signal (connection instruction signal) when the input dimming signal repeats a certain pattern. Output. The analog switch 53a switches to the initial illuminance correction unit 51 side when an H ″ signal is input. Thereby, the initial illuminance correction function can be enabled when the dimming signal is repeated in a certain pattern, and otherwise. The discharge lamp lighting device 200b can be operated as a continuous dimming inverter, and if this pattern is made invisible to the human eye or exceeds the response speed of the inverter, the operation of the lamp is affected. It is possible to operate without

  FIG. 9 is a diagram showing an illumination control system including a plurality of discharge lamp lighting devices 200a and a control unit 500a capable of outputting a dimming signal as a connection instruction signal. The control unit 500a can output a “predetermined dimming signal” corresponding to the dimming signal determination unit 57a. Although not shown, the control unit 500a is a control unit 500b capable of outputting a dimming signal (switching pattern) corresponding to the dimming signal determination unit 57b, and the discharge lamp lighting device 200a is the discharge lamp lighting device. It is also possible to use an illumination control system replaced with 200b. With these illumination control systems, a plurality of discharge lamp lighting devices can be controlled simultaneously.

  FIG. 10 shows a case where a non-volatile memory 51-1 that records the cumulative lighting time of the discharge lamp in a non-volatile manner is formed in the initial illuminance correction unit 51 of the semiconductor substrate 90 of the inverter control IC 50. FIG. 10 shows only the inverter control IC 50, and other components are omitted. When the dimming I / F unit 52 is connected to the control unit 54 and receives a predetermined dimming signal indicating that the cumulative lighting time recorded in the nonvolatile memory is to be reset, the dimming I / F unit 52 Is converted into a reset signal instructing resetting of the cumulative lighting time of the discharge lamp recorded by the nonvolatile memory 51-1, and output. When receiving the reset signal, the control unit 54 outputs a reset control signal that instructs the nonvolatile memory 51-1 to reset the cumulative lighting time of the discharge lamp. When the reset control signal is input, the nonvolatile memory 51-1 resets the recorded cumulative lighting time of the discharge lamp. Thus, the non-volatile memory 51-1 resets the cumulative lighting time of the discharge lamp in response to the output of the reset signal by the dimming I / F unit 52.

  The discharge lamp lighting device according to the second embodiment includes an initial illuminance correction unit 51 and a dimming I / F unit 52 in the inverter control IC 50, and can be switched between them by a predetermined dimming signal. Without providing the switching device, it is possible to enable each function only when necessary, to suppress an increase in the substrate area, and to provide a low-cost discharge lamp lighting device.

  In the discharge lamp lighting device according to the second embodiment, the cumulative lighting time of the discharge lamp recorded in the nonvolatile memory is reset based on the reset signal output from the dimming I / F unit 52. For this reason, the cumulative lighting time can be reset without requiring a new component.

  In the illumination control system according to the second embodiment, each discharge lamp lighting device is connected to the control unit 54 and the initial illuminance correction unit 51 based on the dimming signal output from the control unit. Since the connection with the / F unit 52 is switched, a plurality of discharge lamp lighting devices can be controlled simultaneously.

Embodiment 3 FIG.
Next, Embodiment 3 will be described with reference to FIGS. FIG. 11 is a circuit diagram showing a circuit configuration of a discharge lamp lighting device 300 according to the third embodiment. The discharge lamp lighting device 300 according to the third embodiment includes an inverter control IC 50 in which an initial illuminance correction unit 51 and a dimming I / F unit 52 are formed, and a high breakdown voltage driver unit 55 (drive circuit) that drives the inverter circuit unit 30. ) And separate parts. As described above, the discharge lamp lighting device 300 according to the third embodiment includes the inverter control IC 50 that includes both the initial illuminance correction unit 51 and the dimming I / F unit 52 and that inputs the dimming signal from the outside. The inverter control IC 50 is a discharge lamp lighting device, and includes a power factor correction function unit 56 and a control unit 54. In the discharge lamp lighting device 300, the inverter control IC 50 and the high breakdown voltage driver unit 55 that requires a high breakdown voltage are separate components. By using separate components, as described later with reference to FIG. 13, the high withstand voltage driver unit 55 can be disposed farther than the inverter control IC 50 from the power supply terminal of the commercial power supply of the mounting board. .

  Next, the discharge lamp lighting device 300a of FIG. 12 will be described. A discharge lamp lighting device 300a in FIG. 12 has a configuration in which an external switch SW1 and a protection circuit 60 are added to the discharge lamp lighting device 300 in FIG. The discharge lamp lighting device 300a in FIG. 12 is configured such that, in the discharge lamp lighting device 100a in FIG. 3, the high-voltage driver portion 55 included in the inverter control IC 50 of the discharge lamp lighting device 100a is a separate component from the inverter control IC. .

  The operation of the high withstand voltage driver unit 55 is the same as that described in the discharge lamp lighting device 100a of FIG. That is, the high withstand voltage driver unit 55 receives an inverter control signal from the control unit 54, generates a drive signal for driving the inverter circuit unit 30 from the inverter control signal, and outputs the drive signal to the inverter circuit unit 30. Drive.

  FIG. 12 will be described. The inverter control IC 50 controls a power factor improvement function unit 56 that controls a power factor improvement circuit (PFC) (not shown), a power factor improvement function unit 56, and a high voltage driver unit 55 outside the inverter control IC 50. A control unit 54 that controls the inverter circuit unit 30; an initial illuminance correction unit 51 that performs initial illuminance correction; a dimming I / F unit 52 that controls brightness by a dimming signal from the outside; an initial illuminance correction unit 51; It comprises an analog switch 53a for switching the “brightness control signal” from the optical I / F unit 52 by an external signal.

  FIG. 13 shows the appearance of the mounting substrate 600 to which the components constituting the discharge lamp lighting device 300a are attached. As shown in FIG. 13, the inverter control IC 50 and the high breakdown voltage driver unit 55 are separate components. As shown in FIG. 13, the discharge lamp lighting device 300 a is arranged on a substantially rectangular mounting board 600, an input terminal arranged on one side in the longitudinal direction of the mounting board 600, and on the other side in the longitudinal direction of the mounting board 600. Provided with an output terminal, an inverter control IC 50, a boost chopper circuit unit disposed on the input terminal side, and a high voltage driver unit 55 (drive circuit) that operates in response to an inverter control signal output from the inverter control IC 50. And an inverter circuit unit disposed on the output terminal side. Thus, by making the inverter control IC 50 and the high breakdown voltage driver unit 55 as separate components, the inverter control IC 50 and the high breakdown voltage driver unit 55 are viewed in this order from the commercial power input side (power supply terminal) on the mounting board 600. It becomes possible to dispose, and the high withstand voltage driver unit 55 can be disposed farther than the inverter control IC 50 with respect to the commercial power supply (power supply terminal) of the mounting board. Thereby, the arrangement on the mounting substrate 600 can be optimized, and the dead space due to the extra wiring area can be reduced.

  The discharge lamp lighting device according to the third embodiment incorporates an initial illuminance correction unit 51 and a dimming I / F unit 52 in the inverter control IC 50, and each function is provided only when necessary by switching from the outside. In addition to being able to be effective, the high withstand voltage driver section 55 is a separate component from the inverter control IC 50, so even with a thinner mounting board, the dead space occupied by wiring for avoiding the components is eliminated, and the area of the mounting board is reduced. An increase in the discharge lamp lighting device can be provided while suppressing an increase.

FIG. 3 is a diagram for explaining initial illuminance correction and continuous light control in the first embodiment. 1 is a circuit diagram of a discharge lamp lighting device 100 according to Embodiment 1. FIG. 1 is a circuit diagram of a discharge lamp lighting device 100a according to Embodiment 1. FIG. FIG. 3 is a circuit diagram of a discharge lamp lighting device 100b in the first embodiment. FIG. 3 is a circuit diagram of a discharge lamp lighting device 100c in the first embodiment. FIG. 5 is a circuit diagram of a discharge lamp lighting device 200 according to Embodiment 2. The circuit diagram of the discharge lamp lighting device 200a in Embodiment 2. FIG. The circuit diagram of the discharge lamp lighting device 200b in Embodiment 2. FIG. FIG. 6 is a configuration diagram of a lighting control system in a second embodiment. FIG. 4 shows an initial illuminance correction unit including a nonvolatile memory according to Embodiment 2. FIG. 6 is a circuit diagram of a discharge lamp lighting device 300 according to Embodiment 3. The circuit diagram of the discharge lamp lighting device 300a in Embodiment 3. FIG. FIG. 6 shows a substrate arrangement in a third embodiment. The figure which shows the prior art.

Explanation of symbols

  LA discharge lamp, L1, L2 choke coil, C1, C2, C3, C4 capacitor, Q1, Q2, Q3 switching element, D1 diode, SW1 external switch, 1 commercial power supply, 10 full-wave rectifier circuit, 20 boost chopper circuit section, 30 inverter circuit unit, 40 load circuit, 50 inverter control IC, 51 initial illuminance correction unit, 51-1 nonvolatile memory, 52 dimming I / F unit, 53 switching circuit, 53a analog switch, 54 control unit, 55 high voltage driver Unit, 56 power factor improvement function unit, 57, 57a, 57b dimming signal determination unit, 57b-1 dimming signal switching repetitive detection circuit, 58 comparator, 59 reference voltage source, 60 protection circuit, 70a, 70b remote control receiving circuit , 90 Semiconductor substrate, 100, 100a, 100b, 100c, 2 0,200a, 200b, 300,300a discharge lamp lighting apparatus, 500a, 500b control unit, 600 mounting board, 700 remote control, 710 operation unit, 720 selection switch.

Claims (4)

A step-up chopper circuit for boosting a DC voltage including a pulsating component;
The first switching element and the second switching element are connected in series, and when the drive signal is input to the first switching element and the second switching element, the first switching element and the second switching element and second switching elements oscillate by the oscillation, a discharge lamp in which the step-up chopper circuit unit converts the DC voltage boosted to a high frequency voltage, comprising an inverter circuit section for supplying to the discharge lamp converted high-frequency voltage In the inverter control IC that controls the oscillation operation of the first switching element and the second switching element of the inverter circuit unit of the lighting device,
Is composed of a single semiconductor substrate, the semiconductor substrate,
A brightness control signal is input, and an inverter control signal for controlling the oscillation operation of the first switching element and the second switching element is generated, and an inverter control signal corresponding to the input brightness control signal is generated A control unit that outputs
An initial illuminance correction unit that outputs the brightness control signal by executing an initial illuminance correction that is a process of controlling the light output of the discharge lamp according to the cumulative lighting time of the discharge lamp;
A dimming signal conversion unit that inputs a dimming signal for dimming the discharge lamp , converts the input dimming signal into the brightness control signal, and outputs the brightness control signal ;
By switching the connection between the control unit and the initial illuminance correction unit and the connection between the control unit and the dimming signal conversion unit, the output source of the brightness control signal is changed to the initial illuminance correction unit and the dimming control unit. The switching unit to switch to any of the optical signal conversion unit;
The inverter control signal output by the controller is input, the input inverter control signal is converted into the drive signal, and the converted drive signal is converted into the first switching element and the second switching element. Input high voltage drive circuit and
An inverter control IC characterized in that is formed . A step-up chopper circuit for boosting a DC voltage including a pulsating component;
The first switching element and the second switching element are connected in series, and when the drive signal is input to the first switching element and the second switching element, the first switching element and the second switching element And an inverter circuit unit that converts the DC voltage boosted by the boost chopper circuit unit into a high-frequency voltage and supplies the converted high-frequency voltage to the discharge lamp.
An inverter control signal for controlling the oscillation operation of the first switching element and the second switching element is input, the input inverter control signal is converted into the drive signal, and the converted drive signal is converted into the first drive signal. A high-breakdown-voltage drive circuit that inputs to the switching element and the second switching element;
In an inverter control IC for controlling the oscillation operation of the first switching element and the second switching element of the inverter circuit unit of the discharge lamp lighting device comprising:
It is composed of one semiconductor substrate, and the semiconductor substrate includes
A controller that inputs a brightness control signal, generates the inverter control signal corresponding to the input brightness control signal, and outputs the inverter control signal to the drive circuit;
An initial illuminance correction unit that outputs the brightness control signal by executing an initial illuminance correction that is a process of controlling the light output of the discharge lamp according to the cumulative lighting time of the discharge lamp;
A dimming signal conversion unit that inputs a dimming signal for dimming the discharge lamp, converts the input dimming signal into the brightness control signal, and outputs the brightness control signal;
By switching the connection between the control unit and the initial illuminance correction unit and the connection between the control unit and the dimming signal conversion unit, the output source of the brightness control signal is described as the initial illuminance correction unit. The switching unit that switches to any one of the optical signal conversion unit and
An inverter control IC characterized in that is formed. A discharge lamp lighting device comprising the inverter control IC according to claim 1 . A discharge lamp lighting device comprising the inverter control IC according to claim 1;
A control unit for switching the connection between the control unit and the initial illuminance correction unit and the connection between the control unit and the dimming signal conversion unit to the switching unit;
A lighting control system comprising:

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