JP5659556B2 - Lighting control device and lighting device - Google Patents

Description

  The present invention relates to a lighting control device and a lighting device that control lighting of a light source such as an LED (light emitting diode) or a discharge lamp.

  2. Description of the Related Art Conventionally, lighting control devices that turn on a light source such as a discharge lamp are known that use an inverter circuit. In this case, the lighting control device changes the output from the boost chopper circuit having a switching element, which is a power factor correction circuit, to a desired output by switching control of the inverter circuit, and controls the discharge lamp to light.

  In recent years, a lighting control device for turning on a light source such as an LED element as a light emitting element has been put into practical use. In this case, the lighting control device performs step-up or step-down on the supplied power to control the current flowing in the LED element. Thereby, the lighting control device lights the LED element with a desired brightness.

  Some lighting control devices control the brightness of a light source based on a remote control signal input from the outside, for example. For example, Patent Document 1 discloses a technique for controlling the brightness of a light source based on a remote control signal input from the outside.

JP 2010-40374 A

  In a conventional lighting control device, an MPU (arithmetic element) that processes a remote control signal received from the outside and a control element for adjusting the brightness of a light source are configured as separate parts. For this reason, if the MPU does not recognize the switching frequency by the control element, it may be difficult to distinguish the remote control signal if noise generated by switching is superimposed on the remote control signal.

  Further, as a configuration for removing noise, a configuration in which a PLL or the like is added to a circuit is conceivable.

  Accordingly, an object of the present invention is to provide a lighting control device and a lighting device that can stably control lighting of a light source with a simple configuration.

The lighting control device according to claim 1 is a power supply unit that converts electric power supplied from an external power source into desired power by switching and supplies the light source; and a receiving unit that receives a digital signal input from the outside; Storage means for preliminarily storing the switching frequency of the control signal output to the power supply means; calculating the frequency of noise in the digital signal received by the receiving means; and determining the presence or absence of noise other than the switching frequency in the received digital signal Noise detecting means for identifying using the switching frequency stored in the storage means ; a function for analyzing the received digital signal based on the presence or absence of noise other than the switching frequency in the received digital signal; and based on the analysis result Generating a control signal for controlling the power supply means; Anda function of analyzing the digital signal, and the function of generating the control signal, and wherein the Rukoto integrally provided.

  In the present invention and each of the following inventions, each configuration is as follows unless otherwise specified.

  The light source connected to the connection terminal is, for example, a light emitting diode, an organic EL element, or a discharge lamp. Note that the light emitting diode may be provided with a plurality of light emitting diodes that emit light of different wavelengths. The power supply means indicates a power conversion circuit such as a booster circuit, a step-down circuit, a step-up / step-down circuit, or an inverter, and outputs desired power by controlling a switching element.

The lighting control device according to claim 2 further includes jitter means for diffusing the switching frequency in a predetermined range according to claim 1 , wherein the storage means stores a range of the switching frequency in advance; The detection means identifies the presence or absence of noise other than the switching frequency in the received digital signal by using the switching frequency range stored in the storage means.

An illumination device according to a third aspect includes a light source; the lighting control device according to claim 1 or 2 ; and an appliance body provided with the lighting control device.

  According to the first aspect of the present invention, the function of analyzing a remote control signal received from the outside and the function of generating a control signal for adjusting the brightness of the light source based on the analysis result are integrally formed. Therefore, the lighting control device can perform control of the power supply means by an external digital signal without being affected by the switching of the power supply means.

According to the first aspect of the present invention, since the lighting control device stores and uses the noise caused by the switching of the power supply means in the storage means, the switching noise can be reliably recognized even when the switching frequency changes. The digital signal received from can be analyzed accurately.

According to invention of Claim 2 , the lighting control apparatus can reduce the electrical noise which concentrates on a predetermined frequency and generate | occur | produces.

According to invention of Claim 3, the illuminating device which has the effect of Claim 1 or 2 can be provided.

Drawing 1 is an explanatory view for explaining the example of composition of the illuminating device concerning one embodiment. FIG. 2 is an explanatory diagram for explaining the MPU noise recognition processing. FIG. 3 is an explanatory diagram for explaining an example of the switching frequency. FIG. 4 is an explanatory diagram for explaining an example of the switching frequency. FIG. 5 is an explanatory diagram for explaining a configuration example of a lighting apparatus according to another embodiment.

  Hereinafter, a lighting control device and a lighting device according to an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an explanatory diagram for explaining a configuration example of a lighting device 100 according to an embodiment of the present invention.
The illumination device 100 includes a lighting control device and a light source. The lighting device 100 includes a power system 110, a rectifier circuit 120, a booster circuit 130, a step-down circuit 140, a remote control signal receiver 150, an MPU 160, and the like as lighting control devices. Moreover, the illuminating device 100 is equipped with LED180 as a light source.

  The power system 110 is an AC power source such as a commercial power source. The power system 110 may be a connection terminal connected to an AC power source.

  The rectifier circuit 120 includes a rectifier bridge including a plurality of diodes. The rectifier circuit 120 rectifies AC power supplied from the power system 110 into DC power.

  The booster circuit 130 includes a booster chopper. That is, the booster circuit 130 includes a reactor L1, a transistor Tr1, a diode D1, a resistor R1, and a capacitor C1. The transistor Tr1 and the capacitor C1 are connected in parallel with the rectifier circuit 120. Reactor L1 is connected between transistor Tr1 and rectifier circuit 120. The resistor R1 is connected between the transistor Tr1 and GND. The diode D1 is connected between the transistor Tr1 and the capacitor C1. The booster circuit 130 functions as a booster that boosts and outputs a voltage generated across the rectifier circuit 120.

  The step-down circuit 140 includes a step-down chopper. That is, the step-down circuit 140 includes a transistor Tr2, a diode D2, a reactor L2, and a capacitor C2. The diode D2 and the capacitor C2 are connected in parallel with the capacitor C1. The transistor Tr2 is connected between the capacitor C1 and the diode D2. Reactor L2 is connected between diode D2 and capacitor C2. The step-down circuit 140 functions as step-down means for controlling the voltage generated at both ends of the capacitor C2 so that the current flowing through the LED 180 becomes a constant value.

  The remote control signal receiving unit 150 receives a remote control signal output from a terminal such as a remote controller. For example, the remote controller outputs a remote control signal for adjusting the light emission amount of the light source of the illumination device 100 within a predetermined range by infrared rays. In this case, remote control signal receiving unit 150 has a light receiving unit that receives infrared rays. The remote control signal receiving unit 150 receives the remote control signal output from the remote controller by the light receiving unit. The remote control signal receiving unit 150 inputs the received remote control signal to the MPU 160.

  The MPU 160 controls power supply circuits such as the power system 110, the rectifier circuit 120, the booster circuit 130, and the step-down circuit 140. The MPU 160 controls the lighting of the LED 180 by controlling each part.

  Further, the MPU 160 controls the switching element of the power supply circuit based on the remote control signal received from the remote control signal receiving unit 150. For this purpose, the MPU 160 analyzes the received remote control signal. Thereby, the MPU 160 recognizes the light emission amount of the light source indicated by the remote control signal.

  Further, the MPU 160 includes a digital signal processing device (Digital Signal Processor: hereinafter referred to as DSP). The DSP generates a control signal to be supplied to a switching element such as the transistor Tr1 or the transistor Tr2 based on the light emission amount of the light source indicated by the remote control signal. For example, the DSP controls the duty ratio of the control signal input to the transistor Tr1 or the transistor Tr2 according to the analyzed light emission amount.

  The MPU 160 controls ON / OFF of the transistor Tr1 by inputting the generated control signal to the transistor Tr1 of the booster circuit 130. As a result, the MPU 160 controls the voltage generated across the capacitor C1.

  Further, the MPU 160 controls the ON / OFF of the transistor Tr2 by inputting the generated control signal to the transistor Tr2 of the step-down circuit 140. As a result, the MPU 160 controls the voltage generated across the capacitor C2.

  The LED 180 emits light according to a current that flows according to an applied voltage.

  As described above, the MPU 160 controls the voltage and current output from the step-down circuit 140 according to the brightness indicated by the remote control signal received from the remote control signal receiver 150. Accordingly, the MPU 160 can turn on the LED 180 with a desired brightness.

  Further, the MPU 160 detects an input voltage (Vin) input to the booster circuit 130 and an output voltage (VD) output from the booster circuit 130. Further, the MPU 160 detects the output voltage (VF) of the step-down circuit 140 and the current (IF) flowing through the LED 180.

  As described above, the MPU 160 of the lighting control device has a function of analyzing a remote control signal received from the outside and a function of generating a control signal for adjusting the brightness of the light source based on the analyzed result. That is, according to the present embodiment, the MPU 160 has a function of analyzing a remote control signal received from the outside and a function of generating a control signal for adjusting the brightness of the light source based on the analyzed result on the same clock. It has a structure formed integrally in a chip that operates based on the above. In this case, the power supply circuit can be controlled by an external digital signal without being affected by the switching of the power supply circuit.

  Accordingly, it is possible to provide a lighting control device and a lighting device that can stably control lighting of the light source with a simple configuration.

  Note that the LED 180 may be configured to be removable from the power supply circuit of the lighting device 100. In this case, the illumination device 100 includes a terminal to which an LED or another light emitting element can be attached.

  In the above-described embodiment, an example in which a step-down chopper is provided as the step-down circuit 140 has been described. However, the present invention is not limited to this configuration. The step-down circuit 140 may be composed of other step-down elements.

  Further, if the MPU 160 does not recognize the switching frequency (switching frequency) in the power supply circuit, it may be difficult to determine the remote control signal if noise generated by switching is superimposed on the remote control signal. Therefore, the MPU 160 includes a memory 161 that stores in advance the switching frequency in the power supply circuit.

  FIG. 2 is an explanatory diagram for explaining the noise recognition processing of the MPU 160. As shown in FIG. 2, the memory 161 includes a control signal frequency (first switching frequency) input from the MPU 160 to the transistor Tr1 of the booster circuit 130, and a control signal input from the MPU 160 to the transistor Tr2 of the step-down circuit 140. Are stored respectively (second switching frequency). Thereby, MPU160 recognizes the switching frequency in each switching element.

  When receiving the remote control signal from the remote control signal receiving unit 150, the MPU 160 recognizes the logic of “0” and “1” based on the ratio between the High time and Low time of the remote control signal.

  Here, for example, when the MPU 160 receives a short high signal while continuously receiving a low signal, the MPU 160 recognizes the short high signal as noise. In addition, for example, when the MPU 160 receives a short Low signal in a state where it continuously receives a High signal, the MPU 160 recognizes the short Low signal as noise. That is, the MPU 160 functions as a noise detection unit that detects noise. The MPU 160 stores the generation timing of the signal recognized as noise in a buffer memory or the like.

  The MPU 160 calculates a noise frequency at which noise is generated based on a plurality of noise generation timings stored in the buffer memory. The MPU 160 compares the noise frequency with the first and second switching frequencies stored in the memory 161, respectively. If there is a match, the MPU 160 can identify the cause of the noise.

  For example, when the noise frequency matches the first switching frequency stored in the memory 161, the MPU 160 recognizes that the noise is noise generated by switching of the transistor Tr1 of the booster circuit 130. For example, when the noise frequency matches the second switching frequency stored in the memory 161, the MPU 160 recognizes that the noise is noise generated by switching of the transistor Tr2 of the step-down circuit.

  As described above, the MPU 160 can recognize noise generated in the remote control signal due to the influence of switching in the power supply circuit. That is, the MPU 160 can analyze the signal assuming that there is no noise in the received signal by recognizing noise generated in a predetermined cycle in the signal. As a result, the MPU 160 can recognize the exact logic indicated by the remote control signal.

  Accordingly, it is possible to provide a lighting control device and a lighting device that can stably control lighting of the light source with a simple configuration.

  In the above-described embodiment, the MPU 160 has described an example of detecting noise in the remote control signal received from the remote control signal receiving unit 150, but is not limited to this configuration. According to the above-described embodiment, the present invention can be applied to any configuration that controls the light emission amount of the light source based on a digital signal input from the outside.

  For example, when a turn-off circuit such as a photosensor is connected to the lighting device 100, the MPU 160 can detect noise generated in a turn-off signal input from the turn-off circuit by the above method. As a result, the MPU 160 can accurately recognize the turn-off signal input from the turn-off circuit.

  In the above-described embodiment, the MPU 160 has been described with respect to an example in which the control signal is always input to the power supply circuit and the lighting circuit at a constant cycle. The MPU 160 may further have a jitter function.

  When the device operates at a fixed frequency, electrical noise is concentrated at a predetermined frequency. For this reason, the noise of a predetermined frequency tends to increase.

  The jitter function is a function for spreading the frequency of an output signal within a predetermined range. That is, the MPU 160 spreads the frequency of the control signal output to each switching element of the power supply circuit within a predetermined range. Thereby, electrical noise at a predetermined frequency can be reduced.

  FIG. 3 is an explanatory diagram illustrating an example of a control signal input from the MPU 160 to the transistor Tr1 of the booster circuit 130. FIG. 4 is an explanatory diagram illustrating an example of a control signal input from the MPU 160 to the transistor Tr2 of the step-down circuit 140.

  As shown in FIGS. 3 and 4, the MPU 160 changes the first switching frequency and the second switching frequency within a predetermined range according to time, and outputs them. In this case, the memory 161 stores the first switching frequency and the second switching frequency for each time.

  When a digital signal input from the outside is input, the MPU 160 detects noise in the digital signal, calculates a noise frequency, and the first switching frequency and the second switching frequency stored in the memory 161. Compare with each frequency. As a result, the MPU 160 can recognize noise in the digital signal input from the outside and reduce the noise level emitted from the device itself.

  Note that although the MPU 160 has been described as changing the first switching frequency and the second switching frequency within a predetermined range according to time, the MPU 160 is not limited to this configuration. The MPU 160 is configured to set a frequency range to be diffused to each of the first switching frequency and the second switching frequency, and to generate a control signal that is randomly input to each switching element of the power supply circuit within the set range. Also good. In this case, the memory 161 stores the first switching frequency and the second switching frequency with a width.

  When a digital signal input from the outside is input, the MPU 160 detects noise in the digital signal, calculates a noise frequency, and the first switching frequency and the second switching frequency in which the noise frequency is stored in the memory 161. Judge whether it falls within the frequency range. Thereby, the MPU 160 can recognize the switching noise generated when the switching of the power supply circuit affects the digital signal received from the outside. As a result, the MPU 160 can accurately analyze the digital signal received from the outside.

  In the above-described embodiment, the example in which the LED 180 is used as the light source has been described. However, the present invention is not limited to this configuration. The light source included in the illumination device 100 may be any type.

  FIG. 5 is an explanatory diagram for explaining an example in which the illumination device 100 includes a discharge lamp as a light source. The same components as those shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  For example, when the lighting device 100 includes a discharge lamp as a light source, the lighting device 100 includes an inverter circuit 170. The inverter circuit 170 converts the direct current output from the booster circuit 130 into an alternating current and outputs the alternating current to the discharge lamp.

  The inverter circuit 170 is connected in parallel with the capacitor C1 of the booster circuit 130. The inverter circuit 170 includes a series circuit of field effect transistors FET1 and FET2 as switching elements. That is, the inverter circuit 170 is configured as a half-bridge type inverter circuit.

  The gates of the field effect transistors FET1 and FET2 are connected to the high side driver 171. The high side driver 171 controls on / off of the field effect transistors FET1 and FET2 based on a control signal output from the MPU 160.

  Furthermore, the lighting device 100 includes a resonance circuit 172 connected to the subsequent stage of the inverter circuit 170. The resonance circuit 172 includes a reactor L4 connected in parallel with the field effect transistor FET2. The resonance circuit 172 includes a capacitor C3 and a reactor L3 connected in series between the inverter circuit 170 and the reactor L4. A discharge lamp 190 is connected to the resonance circuit 172 as a light source.

  The MPU 160 generates a dimming control signal based on the received remote control signal. The MPU 160 outputs the generated control signal to the high side driver 171.

  The high-side driver 171 generates a control signal having an operating frequency of about several tens of kHz to 200 kHz in accordance with the dimming control signal supplied from the MPU 160. The high side driver 171 alternately turns on and off the field effect transistors FET1 and FET2 of the inverter circuit 170 according to the generated control signal. As a result, the high side driver 171 generates a high-frequency AC output between the drain and source of the field effect transistor FET2.

  The inverter circuit 170 supplies the generated high-frequency AC output to the resonance circuit 172. The resonance circuit 172 performs a resonance operation by the reactor L3 and the capacitor C4. Thereby, the resonance circuit 172 changes the voltage applied to the discharge lamp 190 and the current passing through both terminals of the discharge lamp 190 according to the frequency of the high-frequency AC output of the inverter circuit 170.

  That is, in this case, the MPU 160 can control the light emission amount of the discharge lamp 190 by adjusting the switching frequency of the inverter circuit 170.

  Also in this case, the switching of the field effect transistors FET1 and FET2 of the inverter circuit 170 may affect the digital signal received from the outside and generate noise.

  In this case, the MPU 160 recognizes the switching frequency in the field effect transistors FET1 and FET2 of the inverter circuit 170. That is, the MPU 160 detects noise in the digital signal input from the outside, calculates the noise frequency, and compares the noise frequency with the switching frequency in the inverter circuit 170. When the noise frequency matches the switching frequency in the inverter circuit 170, the MPU 160 can recognize that the noise is noise generated by the switching effect of the inverter circuit 170.

  In the example illustrated in FIG. 5, the lighting device 100 includes a booster circuit 130. In this case, the MPU 160 includes a memory 162 that stores in advance the switching frequency in the booster circuit 130.

  In this case, the MPU 160 detects noise in the digital signal input from the outside, calculates the noise frequency, compares the noise frequency with the switching frequency in the inverter circuit 170, and further stores the noise frequency in the memory 162. The switching frequency (that is, the switching frequency in the booster circuit 130) is compared.

  When the noise frequency and the switching frequency in the inverter circuit 170 match, the MPU 160 can recognize that the noise is noise generated due to the influence of switching of the inverter circuit 170.

  In addition, when the noise frequency matches the switching frequency stored in the memory 162, the MPU 160 can recognize that the noise is noise generated by the switching effect in the booster circuit 130.

  As described above, the present invention can be realized even when the lighting device 100 uses the discharge lamp 190 as a light source. Further, the same effect can be obtained as in the case of using a semiconductor light emitting element.

  In addition, this invention is not limited to the said embodiment as it is, It can implement by changing a component in the range which does not deviate from the summary in an implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine the component covering different embodiment suitably.

  L1 ... reactor, Tr1 ... transistor, D1 ... diode, R1 ... resistor, C1 ... capacitor, Tr2 ... transistor, D2 ... diode, L2 ... reactor, C2 ... capacitor, 100 ... lighting device, 110 ... electric power system, 120 ... rectifier circuit , 130 ... Boost circuit, 140 ... Step-down circuit, 150 ... Remote control signal receiver, 160 ... MPU, 161 ... Memory, 162 ... Memory, 170 ... Inverter circuit, 171 ... High-side driver, 172 ... Resonant circuit, 180 ... LED, 190 ... discharge lamp.

Claims (3)

Power supply means for converting electric power supplied from an external power source to desired power by switching and supplying the light source;
Receiving means for receiving an externally input digital signal;
Storage means for previously storing a switching frequency of a control signal output to the power supply means;
Noise detecting means for calculating the frequency of noise in the digital signal received by the receiving means and identifying the presence or absence of noise other than the switching frequency in the received digital signal using the switching frequency stored in the storage means;
A function of analyzing the received digital signal based on the presence or absence of noise other than the switching frequency in the received digital signal;
A function of generating a control signal for controlling the power supply means based on an analysis result;
Equipped with,
Wherein the function of analyzing the digital signal, and the function of generating the control signal, the lighting control device according to claim Rukoto integrally provided. Jitter means for spreading the switching frequency in a predetermined range;
The storage means pre-stores a switching frequency range;
2. The lighting control according to claim 1 , wherein the noise detection unit identifies presence / absence of noise other than the switching frequency in the received digital signal by using a switching frequency range stored in the storage unit. apparatus. With a light source;
A lighting control device according to claim 1 or 2;
An instrument body provided with the lighting control device;
An illumination device comprising:

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