JP2014232599A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device that facilitates a setting operation for dimming.SOLUTION: A lighting device 100 includes a power factor improvement circuit 110 and a lighting circuit 120, connects to a commercial AC power supply AC, and generates a DC current to be supplied to straight tube LED lamps 300a, 300b from the commercial AC power supply AC. Connectors 102a, 102b connect to a dimmer 200. A dimming interface circuit 130 connects to the connectors 102a, 102b, and outputs a different signal in accordance with the polarity of a signal from the dimmer 200. A control circuit 140 changes the content of dimming control in response to the signal from the dimming interface circuit 130. A mere change in the polarity of a signal line of the dimmer 200 connected to the lighting device 100 automatically switches between continuous dimming (100% lighting mode) and step dimming (70% lighting mode) without requiring other switch operations.

Description

  The present invention relates to a lighting device.

  Conventionally, as disclosed in, for example, Japanese Patent Application Laid-Open No. 2001-338783, a lighting device that can switch between step dimming and continuous dimming by operating a switch is known. Thereby, the lighting device which can perform step light control and continuous light control with one unit is provided.

JP 2001-338783 A

  Usually, the lighting device is mounted inside the lighting fixture. In the above-described conventional technology, the switch of the lighting device has to be operated in order to perform dimming setting, specifically, switching between step dimming and continuous dimming. For this reason, it is necessary to determine how to use the dimming function of the lighting device attached inside the lighting fixture at the stage of installation.

  The lighting fixture includes external devices other than the lighting device. Even if the dimming setting is performed by appropriately operating the switch of the lighting device, it is necessary for the external device to similarly perform the appropriate setting in accordance with the setting content. This is because it is necessary to match the settings of the switch of the lighting device and the external device. For this reason, there has been a problem that setting work and confirmation are time-consuming.

  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 simplifies setting work related to dimming.

The lighting device according to the present invention is
A converter that generates a DC power source from an AC power source and generates a current to be supplied to the light emitting element from the DC power source;
A connector connected to the dimmer;
An interface circuit that connects to the connector and outputs different signals according to the polarity of the signal from the dimmer;
In accordance with a signal from the interface circuit, a control circuit that changes the content of dimming control in the converter;
It is characterized by providing.

  According to the present invention, it is possible to simplify the setting work related to dimming.

It is a circuit diagram of the lighting device concerning an embodiment of the invention. It is a circuit diagram which shows the detail of the light control interface circuit and control circuit concerning embodiment. 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 embodiment of this invention. It is a figure for demonstrating operation | movement of the lighting device concerning embodiment of this invention.

Configuration of the apparatus according to the embodiment.
[Overall configuration]
FIG. 1 is a circuit diagram of a lighting device 100 according to an embodiment of the present invention and a lighting device 1000 including the same. The lighting device 100 includes connectors 102 a and 102 b that receive the PWM signal from the dimmer 200. The lighting device 100 includes connectors 106a and 106 and connectors 104a and 104b. Connectors 106a and 106 are connected to commercial AC power supply AC, and connectors 104a and 104b are connected to straight tube LED lamps 300a and 300b.

  The lighting device 100 receives AC power from the commercial AC power supply AC and supplies DC current to the straight tube LED lamps 300a and 300b connected in series. The forward voltage VF when the straight tube LED lamps 300a and 300b are connected in series is about 90V to 190V.

  In the present embodiment, the case where straight tube LED lamps 300a and 300b are used as the light-emitting elements will be described, but the present invention is not limited to this. The light emitting element is not limited to the straight tube LED lamps 300a and 300b, but may be an LED module substrate or an organic EL panel on which a plurality of LEDs are mounted.

  The lighting device 100 includes a power factor correction circuit 110, a lighting circuit 120, a dimming interface circuit 130, and a control circuit 140. The power factor correction circuit 110 and the lighting circuit 120 constitute a converter that generates a direct current from the commercial AC power supply AC.

  The power factor correction circuit 110 receives AC power from the commercial AC power supply AC by the diode bridge DB1 to generate a DC voltage and improves the power factor. The lighting circuit 120 is connected to the power factor correction circuit 110 and supplies current to the straight tube LED lamps 300a and 300b. The dimming interface circuit 130 is an interface that receives a dimming signal from the dimmer 200. The control circuit 140 receives the dimming signal from the dimming interface circuit 130 and controls the lighting circuit 120.

  The power factor correction circuit 110 includes a diode bridge DB1, an inductor L1, a diode D1, a MOS-FET (MOS field effect transistor) Q1, resistors R1, R2, and R3, an electrolytic capacitor C1, and a SW control circuit 111. The voltage detection unit 112 is provided. These circuit elements constitute a boost chopper circuit.

  The SW control circuit 111 controls switching of the MOS-FET Q1. The resistors R1 and R2 are voltage dividing circuits connected in parallel with the electrolytic capacitor C1, and the resistor R3 has one end connected to the connection point of the resistors R1 and R2 and the other end connected to the voltage detector 112 to detect the voltage. The voltage detector 112 detects the voltage detected by the resistors R <b> 1 to R <b> 3 and outputs the detected value to the SW control circuit 111.

  The lighting circuit 120 includes a MOS-FET (MOS field effect transistor) Q2, an inductor L2, a diode D2, resistors R4, R5, and R6, a capacitor C2, a pulse transformer 121, a SW control circuit 122, and a feedback circuit. 123. These circuit elements constitute a step-down chopper circuit.

  The pulse transformer 121 is a transformer for applying a switching signal at a predetermined voltage to the MOS-FET Q2. The SW control circuit 122 gives a switching signal to the pulse transformer 121. The feedback circuit 123 detects the current flowing through the resistor R6 and outputs the detected value to the SW control circuit 122.

[Dimming interface circuit and control circuit]
FIG. 2 is a circuit diagram showing details of the dimming interface circuit 130 and the control circuit 140 according to the present embodiment. Details of these circuits will be described with reference to FIG.

  The dimming interface circuit 130 outputs the PWM signal to the control circuit 140 as a dimming signal. The dimming interface circuit 130 uses the photocoupler PC2 to match the reference voltage of the dimmer 200, which is an external device, and the lighting device 100, or eliminates the polarity of connection with the dimmer 200 using the diode bridge DB2. Have a role to play.

  The dimming interface circuit 130 includes a PWM signal conversion circuit 131 and a PWM signal polarity determination circuit 132. The PWM signal conversion circuit 131 converts the polarity of the PWM signal received via the connectors 102a and 102b to unify pulse signals having different polarities to the same polarity. The PWM signal polarity determination circuit 132 determines the polarity of the PWM signal input to the connectors 102a and 102b. The PWM signal polarity determination circuit 132 outputs different signals according to the polarity of the signal from the dimmer 200 as shown in FIGS. 3C and 4C described later.

  The PWM signal conversion circuit 131 includes resistors R7 to R9, a diode bridge DB2, a photocoupler PC1, and a MOS-FET Q3. Specifically, the connector 102a is connected to one input of the diode bridge DB2 via the resistor R7, and the connector 102b is connected to the other input of the diode bridge DB2.

  The output of the diode bridge DB2 is connected to the light emitting element (light emitting diode) of the photocoupler PC1. The light receiving element (phototransistor) of the photocoupler PC1 has one end connected to the ground and the other end connected to the power supply Vcc via the resistor R8. The gate of the MOS-FET Q3 is connected between the other end of the phototransistor of the photocoupler PC1 and the resistor R8. The other end of the MOS-FET Q3 is connected to the power source Vcc via the resistor R9.

  The PWM signal polarity determination circuit 132 includes resistors R10 and R11, a diode D3, and a photocoupler PC2. Specifically, the resistor R10, the diode D3, and the light-emitting diode of the photocoupler PC2 are sequentially connected in series in parallel with the connectors 102a and 102b. One end of the phototransistor of the photocoupler PC2 is connected to the ground, and the other end is connected to the power supply Vcc via the resistor R11.

The control circuit 140 is specifically a microcomputer. The control circuit 140 includes an on-duty determination unit 141, a step dimming determination unit 142, and a control unit 143.
The on-duty determination unit 141 receives the output of the PWM signal conversion circuit 131, specifically, the voltage at the connection point of the MOS-FET Q3 and the resistor R9. The output of the PWM signal polarity determination circuit 132, specifically, the voltage at the connection point between the phototransistor of the photocoupler PC2 and the resistor R11 is input to the stage dimming determination unit 142. The control unit 143 receives the outputs of the on-duty determination unit 141 and the step dimming determination unit 142.

Operation of the apparatus according to the embodiment.
[Operation with continuous light control]
A case where the lighting device 100 performs a continuous light control operation will be described. FIG. 3 is a diagram for explaining the operation of the lighting device 100 according to the embodiment of the present invention. 3A shows a PWM signal for realizing continuous dimming from the dimmer 200, FIG. 3B shows an output waveform of the PWM signal conversion circuit 131 for the PWM signal, and FIG. c) shows the output waveform of the PWM signal polarity determination circuit 132 in this case.

  The PWM signal output from the dimmer 200 is input to the PWM signal conversion circuit 131 and the PWM signal polarity determination circuit 132. The PWM signal input to the PWM signal conversion circuit 131 is converted by the diode bridge DB1 so as to output the same polarity. The waveform of the converted signal is shaped by the photocoupler PC1 and the MOS-FET Q3. The shaped signal is provided to the on-duty determination unit 141. On the other hand, in the PWM signal input to the PWM signal polarity determination circuit 132, if the PWM signal is positive, a current flows through the diode D3, and the PWM signal is transmitted to the stage dimming determination unit 142 via the photocoupler PC2.

  When the signal from the PWM signal polarity determination circuit 132 is a PWM signal, the stage dimming determination unit 142 determines that the continuous dimming is currently adopted and outputs the determination result to the control unit 143. In this case, the control unit 143 sends a dimming signal indicating a dimming rate corresponding to the on-duty ratio of the PWM signal input to the on-duty determination unit 141 to the lighting circuit 120 (specifically, the feedback circuit 123). Output.

  The lighting circuit 120 continuously dimms and lights the straight tube LED lamps 300a and 300b based on the dimming signal input to the feedback circuit 123.

[Operation with step dimming]
Next, the case where the lighting device 100 performs the step dimming operation will be described. FIG. 4 is a diagram for explaining the operation of the lighting device 100 according to the embodiment of the present invention. 4A shows a PWM signal for realizing step dimming from the dimmer 200, FIG. 4B shows an output waveform of the PWM signal conversion circuit 131 for the PWM signal, and FIG. (C) shows the output waveform of the PWM signal polarity determination circuit 132 in this case.

  The difference in hardware configuration when using continuous dimming and step dimming in the lighting device 100 is that the polarity of the signal line connecting the dimmer 200 and the lighting device 100 is reversed. . Therefore, the waveform of the PWM signal is inverted between FIG. 3 (a) and FIG. 4 (a).

  The PWM signal output from the dimmer 200 is input to the PWM signal conversion circuit 131 and the PWM signal polarity determination circuit 132. The PWM signal input to the PWM signal conversion circuit 131 is converted so that the same polarity is output by the diode bridge DB1 as in the case of continuous dimming, and the waveform of the signal converted by the photocoupler PC1 and the MOS-FET Q3 is converted. After shaping, the result is output to the on-duty determination unit 141. Since the PWM signal input to the PWM signal polarity determination circuit 132 is negative, no current flows through the diode D3 and the PWM signal is not transmitted to the stage dimming determination unit 142 via the photocoupler PC2.

  When the signal from the PWM signal polarity determination circuit 132 is not a PWM signal, that is, when the signal from the PWM signal polarity determination circuit 132 is constant at 0 V, the step dimming determination unit 142 has determined that step dimming is currently adopted. The determination result is output to the control unit 143. In this case, the control unit 143 sets the dimming rate corresponding to the on-duty ratio of the PWM signal input to the on-duty determination unit 141 to a predetermined step dimming rate (70% as an example in the present embodiment). The dimming signal multiplied by is output to the lighting circuit 120 (specifically, the feedback circuit 123).

  Based on the dimming signal input to the feedback circuit 123, the lighting circuit 120 illuminates the straight tube LED lamps 300a and 300b with continuous dimming by setting the brightness at the time of all light to 70%.

  As described above, according to the present embodiment, it is possible to perform continuous dimming (100% without requiring another switch operation only by changing the polarity of the signal line of the dimmer 200 connected to the lighting device 100. Lighting mode) and step dimming (70% lighting mode) can be automatically switched.

  FIG. 5 shows the respective light outputs when the lighting device 100 is operated in continuous dimming (100% lighting mode) and in the case where it is operated in step dimming (70% lighting mode), and dimming signals (PWM signals). The on-duty of the When the lighting device 100 performs continuous dimming, the light output becomes 5% when the on-duty ratio of the PWM signal from the dimmer 200 is 95%, and the on-duty ratio of the PWM signal from the dimmer 200 Is 5%, the light output becomes 100%, which is all-light lighting. The dimming rate characteristic is determined so that the light output decreases proportionally from 100% to 5% as the on-duty ratio of the PWM signal from the dimmer 200 increases from 5% to 95%. . On the other hand, when the lighting device 100 performs step dimming, the light output is 70% when the on-duty ratio of the PWM signal from the dimmer 200 is 5%.

  As described above, according to the present embodiment, the polarity of the PWM dimming signal output from the dimmer 200 is determined, and the dimming of the lighting device 100 is automatically performed based on the determined result. Functions can be activated selectively. As a result, it is possible to set the dimming without changing the setting on the lighting device 100 side simply by connecting the dimmer 200, and work efficiency can be improved.

100 lighting device, 102a, 102b, 104a, 104b, 106a, 106b connector, 110 power factor correction circuit, 111, 122 SW control circuit, 112 voltage detection unit, 120 lighting circuit, 121 pulse transformer, 123 feedback circuit, 130 dimming Interface circuit, 131 PWM signal conversion circuit, 132 PWM signal polarity determination circuit, 140 control circuit, 141 on-duty determination unit, 142 stage dimming determination unit, 143 control unit, 200 dimmer, 300a, 300b straight tube LED lamp , 1000 Lighting device, AC commercial AC power supply, DB1, DB2 Diode bridge

Claims (5)

A converter that is connected to an AC power source and generates a DC current supplied from the AC power source to the light emitting element;
A connector connected to the dimmer;
An interface circuit that connects to the connector and outputs different signals according to the polarity of the signal from the dimmer;
In accordance with a signal from the interface circuit, a control circuit that changes the content of dimming control in the converter;
A lighting device comprising:   2. The lighting device according to claim 1, wherein the control circuit switches a plurality of dimming controls having different brightness during all light based on a signal from the interface circuit. The interface circuit includes a rectifier circuit that rectifies and outputs a pulse signal from the connector;
The lighting device according to claim 2, wherein the control circuit switches the plurality of dimming controls depending on whether or not an output of the rectifier circuit is a pulse signal. The interface circuit includes a polarity conversion circuit that outputs a pulse signal obtained by inverting the polarity of the pulse signal from the connector,
The lighting device according to claim 3, wherein the control circuit performs dimming control according to an on-duty ratio of a pulse signal output from the polarity conversion circuit.   The control circuit outputs a pulse output from the polarity conversion circuit when performing dimming control with relatively low brightness in all light among the plurality of dimming controls based on a signal from the interface circuit. 5. The lighting device according to claim 4, wherein dimming control is performed according to a dimming signal obtained by multiplying the on-duty ratio of the signal by the step dimming rate.

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