JP2014220193A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device that can keep luminosity while reducing an operation load.SOLUTION: A control circuit 40 outputs a control signal for controlling the output power of a lighting circuit 20 to a lighting control circuit 21 in accordance with an accumulative lighting time to be counted so that light emitted from a light source module 200 is substantially fixed from its fresh stage till the end of the lifetime thereof. The control circuit 40 stores a dimming rate characteristic X1 in a lighting control table. An initial illuminance correction changes the dimming rate of the light source according to the dimming rate characteristic X1 in accordance with increase of an accumulative lighting time Tnow. The control circuit 40 calculates a count value n increasing according to the frequency of a pull-less operation, and a virtual accumulative lighting time Tset as an integration value of the count value n and the accumulative lighting time Tnow. The control circuit 40 controls the lighting control circuit 21 so that the light source module 200 is turned on at the dimming rate corresponding to the virtual accumulative lighting time Tset on the dimming rate characteristic.

Description

  The present invention relates to a lighting device.

  Conventionally, as disclosed in, for example, Japanese Patent Application Laid-Open No. 2005-285725, a lighting device having a function of switching a lighting mode by a pullless operation is known. The pullless operation is an operation in which an operation switch such as a wall switch is switched on and off in a short time.

  In general, the light source is brightly lit when in a new state, but becomes darker as the cumulative lighting time becomes longer. For this reason, a technique is known in which the light source is turned on at a relatively low dimming rate when the cumulative lighting time is short, and the dimming rate is increased as the cumulative lighting time increases from the initial dimming rate. This is called initial illumination correction. The brightness of the light source can be kept constant by the initial illumination correction.

JP 2005-285725 A JP 2013-37766 A

  Generally, the light source becomes darker as the cumulative lighting time becomes longer. One way to deal with this is to change the brightness after the light source is turned on. However, in this case, there is an annoyance that it is necessary to adjust the brightness of the light source every time the wall switch is turned on. The technique of the above publication is the same in this respect. If the brightness is insufficient, an operation after lighting is necessary.

  The initial illuminance correction is a control technique for keeping the brightness of the light source constant. However, the initial illuminance correction originally changes the dimming rate so as to maintain the initially set brightness. Even if the initial illuminance correction is performed, if the brightness is insufficient when the lamp is lit, eventually there is an annoyance that the brightness must be adjusted afterwards as described above.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a lighting device that can maintain an appropriate brightness while reducing an operation burden.

The lighting device according to the present invention is
A pullless operation detecting means for detecting a pullless operation comprising a combination of an on period in which commercial power is supplied and an off period in which the commercial power is cut off;
A control circuit that performs initial illuminance correction, which is control for increasing the dimming rate of the light source as the cumulative lighting time of the light source increases;
With
The control circuit changes a setting value for designating a dimming rate for the initial illuminance correction according to the pullless operation detected by the pullless operation detection means.

  According to the present invention, it is possible to maintain appropriate brightness while reducing the operation burden.

It is a circuit diagram for demonstrating the structure of the lighting device concerning embodiment of this invention. It is a flowchart for demonstrating operation | movement of the lighting device concerning embodiment of this invention. It is a figure for demonstrating operation | movement of the lighting device concerning embodiment of this invention. It is a figure for demonstrating operation | movement of the lighting device concerning the modification of embodiment of this invention.

[Configuration of Apparatus of Embodiment]
FIG. 1 is a circuit diagram for explaining a configuration of a lighting device 100 according to an embodiment of the present invention. FIG. 1 illustrates a lighting device 1000 including a lighting device 100 connected to an AC power source AC that is a commercial power source, and a light source module 200 that is lit by power supplied from the lighting device 100. A lighting switch SW for turning on and off the electrical connection is provided between the AC power source AC and the lighting device 100.

  The lighting device 100 includes a diode bridge DB, a boost chopper circuit 10, a lighting circuit 20, an AC detection circuit 30, a control circuit (CPU) 40, and a control power supply circuit 50. The diode bridge DB rectifies the input AC voltage. The boost chopper circuit 10 boosts the output voltage of the diode bridge DB.

  The lighting circuit 20 converts the boosted voltage of the boost chopper circuit 10 into electric power that matches the light source module 200. The AC detection circuit 30 is connected to the diode bridge DB and detects that the AC power supply AC is supplied. The control circuit 40 is connected to the AC detection circuit 30 and the lighting circuit 20, and controls power supplied from the lighting circuit 20 to the light source module 200.

  The control power supply circuit 50 is connected to the output of the boost chopper circuit 10 and supplies the control power supply Vcc to the boost chopper circuit 10, the lighting circuit 20, and the control circuit 40.

  The step-up chopper circuit 10 includes a series circuit of an inductor L1 and a diode D1, one end of which is connected to the output of the diode bridge DB. The step-up chopper circuit 10 includes resistors R1 and R2 that divide and detect the output waveform of the diode bridge DB.

  The step-up chopper circuit 10 includes a MOS transistor Q1, a resistor R3 for detecting a current flowing through the MOS transistor Q1, an electrolytic capacitor C1, and a PFC control circuit 11. The PFC control circuit 11 controls the switching of the MOS transistor Q1 based on the detection voltage of the resistors R1 and R2 and the detection current of the resistor R3.

  The lighting circuit 20 includes a MOS transistor Q2 having a drain connected to the cathode of the diode D1, and an inductor L2 having one end connected to the source of the MOS transistor Q2. The other end of the inductor L2 is connected to an output terminal to be connected to the light source module 200.

  The cathode of the diode D2 is connected between the MOS transistor Q2 and the inductor L2, and the anode of the diode D2 is connected to the ground. The capacitor C2 is provided in parallel with the light source module 200 when connected. The resistor R5 detects a current flowing through the light source module 200. The lighting control circuit 21 controls the switching of the MOS transistor Q2.

  The AC detection circuit 30 includes a diode D3 and resistors R6 and R7 connected in series. The anode of the diode D3 is connected between the diode bridge DB and the inductor L1. Resistors R6 and R7 are sequentially connected in series to the cathode of the diode D3. Resistors R6 and R7 divide the voltage input via the diode D3.

  The divided voltage is output as a detection signal for determining whether or not the AC power supply AC is supplied. Since whether or not the AC power supply AC is supplied is switched in a short period of time when the lighting switch SW is pulled, the pullless operation can be detected based on this detection signal. The so-called “pullless operation” is an operation composed of a combination of an on period in which the AC power supply AC is supplied and an off period in which the AC power supply AC is cut off. Specifically, the pullless operation of the present embodiment means that the lighting switch SW is operated from on to off to on in a short time.

  The control circuit 40 is composed of, for example, a microcomputer. The control circuit 40 can receive the voltage divided by the resistors R6 and R7, that is, the detection signal output from the AC detection circuit 30. The control circuit 40 can determine whether or not the AC power supply AC is supplied from the detection signal output from the AC detection circuit 30.

  By determining whether or not the AC power supply AC is supplied, the cumulative lighting time of the light source module 200 is counted. The control circuit 40 controls the lighting of a control signal for controlling the output power of the lighting circuit 20 so that the light emitted from the light source module 200 has a substantially constant brightness from the new time to the lifetime in accordance with the counted cumulative lighting time. Output to the circuit 21. This is a control called initial illuminance correction.

  The control power supply circuit 50 generates a control power supply Vcc from the output of the boost chopper circuit 10. The control power supply circuit 50 is connected to the PFC control circuit 11 of the step-up chopper circuit 10, the lighting control circuit 21 of the lighting circuit 20, and the control circuit 40, and supplies the control power supply Vcc as a power supply for operating them. Can do.

  In the present embodiment, the case where the control power supply Vcc is generated from the output of the step-up chopper circuit 10 will be described. However, the present invention is not limited to this.

  The light source module 200 includes a plurality of semiconductor light emitting elements LED connected in series. In this embodiment, the case where the number of LEDs connected in series is five will be described. However, the present invention is not limited to this. Any LED may be connected in series, or LEDs may be connected in parallel. . The light emission color of the LED of the light source module 200 may be a color temperature such as 3500K in addition to white at 5000K.

[Operation of Apparatus of Embodiment]
First, the initial illumination correction performed by the lighting device 100 according to the present embodiment will be described. Generally, the light source is brightly lit when in a new state, but becomes darker as the cumulative lighting time becomes longer. For this reason, when the cumulative lighting time is short, the light source is turned on at a relatively low dimming rate, and the dimming rate is increased as the cumulative lighting time becomes longer from the initial dimming rate. This is called initial illumination correction. The brightness of the light source can be kept constant by the initial illumination correction.

  The dimming rate is the ratio of the output during dimming control to the rated output of the light source. Specifically, the dimming rate refers to the degree of brightness of the light source when the brightness when the light source is fully lit is 100%. If the dimming rate is 70%, the degree of brightness of the light source is 70%.

  Next, the operation of the lighting device 100 will be described. The lighting circuit 20 determines a current to be supplied to the light source module 200 based on the control signal output from the control circuit 40. The current flowing through the light source module 200 is equal to the current flowing through the resistor R5. For this reason, the lighting control circuit 21 detects the current flowing through the resistor R5 (or the voltage generated in the resistor R5) and controls the on-duty ratio of the MOS transistor Q2, thereby supplying the target current to the light source module 200. Control to supply. In this way, the brightness of the light source module 200 is changed.

  FIG. 2 is a flowchart showing the operation of the lighting device 100 according to the embodiment of the present invention, and is a flowchart of a routine executed by the control circuit 40.

  The control circuit 40 includes a cumulative lighting time counter, a pullless time counter, and a dimming table.

  The “cumulative lighting time counter” is a counter for counting the cumulative lighting time Tnow of the light source module 200, and measures the time during which power is supplied to the light source module 200. In the present embodiment, as described above, the AC detection circuit 30 determines whether or not the AC power supply AC is supplied, thereby counting the cumulative lighting time of the light source module 200.

  The “pullless time counter” is a counter for counting the pullless operation time T. The pullless operation time T is a time during which the AC detection circuit 30 detects that the supply of the AC power supply AC is cut off (output stop time). If the pullless operation time T is a predetermined short period, it can be determined that there has been an intentional on, off, on, that is, pullless operation.

  The “dimming table” is a table that stores the dimming rate characteristics shown in the graph shown in FIG. 3, and shows the dimming rate characteristic X1 that is information that defines the relationship between the cumulative lighting time and the dimming rate. It is a table. Specifically, in the dimming table of FIG. 3, the output current value of the lighting circuit 20 is defined on the vertical axis, and the cumulative lighting time is defined on the horizontal axis.

  The control circuit 40 further includes a count value n. This n is incremented when it is determined that the pullless operation time T satisfies a predetermined condition and a pullless operation has been performed.

  In the routine of FIG. 2, first, the pullless operation time T is reset (step S1).

  Next, the control circuit 40 executes a process for determining whether or not the AC power supply AC is supplied (step S2).

  If it is determined in step S2 that the AC power supply AC is not supplied, the pullless operation time T is counted (step S6). Thereafter, the process returns to step S2.

  If it is determined in step S2 that the AC power supply AC is supplied, a process of calculating a virtual cumulative lighting time Tset by multiplying the cumulative lighting time Tnow by a predetermined number T1 (eg, T1 = 100 hours) and a natural number n is executed. (Step S3).

  Next, the control circuit 40 outputs a control signal to the lighting control circuit 21 so that the light source module 200 is lit at a dimming rate corresponding to the virtual cumulative lighting time Tset (step S4).

  FIG. 3 is a diagram for explaining the operation of the lighting device according to the embodiment of the present invention. FIG. 3 shows a dimming rate characteristic X1 that defines the relationship between the cumulative lighting time Tnow and the dimming rate. The control circuit 40 stores the dimming rate characteristic X1 in the dimming table described above. The control circuit 40 changes the dimming rate of the light source according to the dimming rate characteristic X1 according to the increase in the cumulative lighting time Tnow.

  As described above, the control circuit 40 calculates the count value n that increases in accordance with the number of pullless operations, and the virtual cumulative lighting time Tset that is a value obtained by integrating the count value n and the cumulative lighting time Tnow. The control circuit 40 lights the light source module 200 at a dimming rate (specifically, the output current Is of FIG. 3) corresponding to the virtual cumulative lighting time Tset on the dimming rate characteristic X1. To control.

  The virtual cumulative lighting time Tset corresponds to a set value for designating one dimming rate on the dimming rate characteristic X1. The virtual cumulative lighting time Tset changes according to a count value n indicating the number of pullless operations. That is, according to the present embodiment, the count value n is changed by a pullless operation, thereby setting the light control rate (point Ps in FIG. 3) for starting the initial illuminance correction, that is, the virtual cumulative lighting time Tset. Can be changed.

  Next, the control circuit 40 executes processing for determining whether the pullless operation time T exceeds 0.5 seconds and is within 2 seconds (step S5).

  Next, the control circuit 40 returns to step S2 when it is not in the time range, and executes processing for adding 1 to n when it is within the time range (step S7).

  Next, the control circuit 40 executes a process for determining whether the value of n exceeds 10 (step S8).

  Next, if n exceeds 10 in step S8, the control circuit 40 resets n and returns to step S1, and returns to step S1 if n does not exceed 10 in step S8.

  According to the above processing, the virtual cumulative lighting time is calculated by pullless operation (AC power supply AC supply-cut-off supply pattern) such as a wall switch, and the light source module 200 according to the virtual cumulative lighting time. Can be lit.

  According to the embodiment, the control content of the initial illuminance correction can be easily and arbitrarily changed by the pullless operation. Thereby, it is possible to maintain the brightness while reducing the burden of performing the operation at the time of lighting each time, and the convenience for the user is improved.

  That is, in the present embodiment, the setting value for the initial illuminance correction can be changed by a pullless operation. This initial illuminance correction setting value is a value that specifies a dimming rate for realizing a substantially constant desired brightness in the initial illuminance correction. When the lighting switch SW is turned on, the initial illuminance correction control is performed at the dimming rate specified by the set value. In the embodiment, the virtual cumulative lighting time Tset corresponds to this set value.

  According to the present embodiment, the setting value of the initial illuminance can be easily changed according to the request of the user to use by performing the pullless operation after installing the lighting fixture. Thereby, the necessary brightness can be provided from the next lighting start.

  Further, when the pullless operation is performed a certain number of times or more, the count value n can be reset. Therefore, it is possible to change the setting value for designating the dimming rate when starting the initial illuminance correction any number of times. The setting value is changed only one way. However, since it returns to the initial value after exceeding the upper limit value 10, the set value can be changed repeatedly.

  In the embodiment, the count value n is added every time the pullless operation is performed, so that the virtual cumulative lighting time Tset is largely changed as the number of the pullless operations is increased. For this reason, the set value can be changed in multiple stages.

  Therefore, the virtual cumulative lighting time Tset can be changed in an increasing direction until the number of pullless operations reaches a predetermined number. When the cumulative number of pullless operations reaches 10 (when n> 10), n = 0 and the virtual cumulative lighting time Tset can be set to the actual cumulative lighting time Tnow itself. Instead of setting n = 0 when n> 10, it is possible to change n in the reverse direction by switching from addition to subtraction, and to switch to addition when it decreases to n = 0.

  In the present embodiment, the pullless operation is detected based on the detection signal of the AC detection circuit 30 by the control circuit 40 executing the process of step S5. As a result, it is possible to detect the presence or absence of a pullless operation by monitoring the power supply supply, cutoff, and supply patterns themselves. However, the present invention is not limited to this, and operation means such as a wall switch may be monitored. If the operation input to the operation means is on, off, and on within a predetermined time, it may be determined that there is a pullless operation.

[Modification of Embodiment]
FIG. 4 is a diagram for explaining the operation of the lighting device according to the modification of the embodiment of the present invention. In the above embodiment, the virtual cumulative lighting time Tset is calculated according to the count value n indicating the number of pullless operations. However, the virtual cumulative lighting time is not calculated, and the cumulative cumulative lighting time T as shown in FIG. You may make it change the some light control rate characteristic according to lighting time according to pullless operation.

  In this modification, the control circuit 40 stores a plurality of dimming rate characteristics X21, X22, X23, X24 and X25 in the dimming table. The plurality of dimming rate characteristics X21 to X25 define the relationship between the cumulative lighting time and the dimming rate as different characteristics.

  The plurality of dimming rate characteristics X21 to X25 have the same slope and different intercept values in the dimming table shown in FIG. 4 (orthogonal coordinate system having the cumulative lighting time and the dimming rate as coordinate axes). Note that the present invention is not limited to this, and one or both of the slope and the intercept may be made different, and the present invention is not limited to a straight line but may have a characteristic including a curve.

  The control circuit 40 performs initial illuminance correction according to the set value Xnow of the dimming rate characteristic to be used at present. This Xnow is a setting value for designating one dimming rate characteristic from among a plurality of dimming rate characteristics. For example, if Xnow = X21, the control circuit 40 controls the lighting control circuit 21 so that the light source module 200 is lit at a dimming rate corresponding to the current cumulative lighting time Tnow according to the dimming rate characteristic X21.

  In this modification, the value assigned to Xnow is sequentially switched to any one of the dimming rate characteristics X21, X22, X23, X24, and X25 in accordance with the pullless operation. As shown in FIG. 4, after switching from X21 to X25 sequentially, the process returns from X25 to X21. Also according to this modified example described above, by performing the pullless operation, the set value of the initial illuminance can be easily changed according to the desire of the user to use.

DESCRIPTION OF SYMBOLS 10 Boost chopper circuit, 11 PFC control circuit, 20 Lighting circuit, 21 Lighting control circuit, 30 AC detection circuit, 40 Control circuit, 50 Control power supply circuit, 100 Lighting device, 200 Light source module, 1000 Lighting device

Claims (7)

A pullless operation detecting means for detecting a pullless operation comprising a combination of an on period in which commercial power is supplied and an off period in which the commercial power is cut off;
A control circuit that performs initial illuminance correction, which is control for increasing the dimming rate of the light source as the cumulative lighting time of the light source increases;
With
The lighting device according to claim 1, wherein the control circuit changes a setting value for specifying a dimming rate for the initial illuminance correction in accordance with a pullless operation detected by the pullless operation detection means.   The lighting device according to claim 1, wherein the set value is greatly increased or decreased as the number of pullless operations is increased. When the number of pullless operations is equal to or less than a predetermined number, the set value is changed in one of the directions in which the dimming rate increases or decreases,
The lighting device according to claim 1 or 2, wherein when the number of pullless operations exceeds the predetermined number, the set value is changed in the opposite direction to the one direction. The control circuit has a dimming rate characteristic that defines a relationship between the cumulative lighting time and the dimming rate,
The initial illuminance correction is to change the dimming rate of the light source according to the dimming rate characteristic according to an increase in cumulative lighting time,
The lighting device according to claim 1, wherein the set value is a value for designating one dimming rate on the dimming rate characteristic. The control circuit includes:
Calculate a count value that increases with the number of pullless operations,
The lighting device according to claim 4, wherein a virtual cumulative lighting time that is a value obtained by integrating the count value and the cumulative lighting time is calculated as the set value. The control circuit has a plurality of different dimming rate characteristics each defining a relationship between the cumulative lighting time and the dimming rate,
The set value is a value for designating one dimming rate characteristic from the plurality of dimming rate characteristics,
2. The control circuit according to claim 1, wherein when the light source is turned on, the light source is turned on at a dimming rate corresponding to a cumulative lighting time on a dimming rate characteristic specified by the set value. 4. The lighting device according to any one of items 3.   The lighting device according to claim 6, wherein the plurality of dimming rate characteristics have different intercept values in an orthogonal coordinate system having the cumulative lighting time and the dimming rate as coordinate axes.

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