JP2016009529A - Data signal reception circuit for illumination control - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a data signal reception circuit for illumination control that is adaptable to control signals different in limit value of input current and transmission speed by the same circuit.SOLUTION: A rectifying unit 20 subjects a data signal for illumination control to half-wave rectification. Constant current circuits 30, 40 are connected in series to the input side of photo-couplers 31, 41 which are supplied with the data signal for illumination control subjected to half-wave rectification by the rectifying unit 20. Input current to the photo-couplers 31, 41 is limited in connection with a first control signal having current value limit of a control signal. Pull-up resistors 33, 43 are connected to the output sides of the photo-couplers 31, 41. A switching unit 23 switches the circuit configuration so that at least one of the resistance value of the constant current circuit 30, 40 and the resistance value of the pull-up resistor 33, 43 decreases when the data signal is a second control signal which has no current value restriction to the control signal and also has a higher transmission speed than the first control signal.

Description

  Embodiments described herein relate generally to a lighting control data signal receiving circuit.

  There are a plurality of control methods for data signals for illumination control. For example, the data signal for lighting control includes a bipolar signal having positive and negative amplitudes and a monopolar signal having only positive and negative amplitudes. As this bipolar signal, there is, for example, T / Flects (registered trademark). Moreover, as a unipolar signal, there is DALI (Digital Addressable Lighting Interface), for example.

  However, for example, since the control method is generally different between a monopolar signal and a bipolar signal, the receiving circuit of the conventional lighting device cannot support both the monopolar signal and the bipolar signal that have the same circuit and different control methods. .

  For example, when the current value of the input current that the receiving circuit can capture from the data signal transmission source is limited, or between control methods with different transmission speeds, the same circuit in the conventional receiving circuit can cope with these. Can not.

JP 2012-160402 A JP 2012-15076

  The problem to be solved by the present invention is to provide a data signal receiving circuit for lighting control that can cope with control signals having different control signal input current limit values and different transmission rates in the same circuit.

  The illumination control data signal receiving circuit according to the embodiment includes a rectifier circuit, a constant current circuit, a pull-up resistor, and a switching unit. The rectifier circuit performs half-wave rectification on the data signal for illumination control. The constant current circuit is connected in series to the input side of the photocoupler to which the data signal for illumination control that has been half-wave rectified by the rectifier circuit is input, and the current value of the control signal is limited to the input current to the photocoupler. The limit is made corresponding to the first control signal. The pull-up resistor is connected to the output side of the photocoupler. When the data signal is a second control signal that has a current value of the control signal that is not limited and has a higher transmission speed than the first control signal, at least the resistance value of the constant current circuit and the resistance value of the pull-up resistor The circuit configuration is switched so that one is reduced.

  According to the illumination control data signal receiving circuit of the embodiment, it can be expected that the same circuit can cope with control signals having different control signal input current limit values and different transmission speeds.

FIG. 1 is a diagram illustrating a configuration example of a lighting system according to the first embodiment. FIG. 2 is a diagram illustrating a configuration example of the illumination device according to the first embodiment. FIG. 3 is a diagram for explaining types of data signals according to the first embodiment. FIG. 4 is a diagram illustrating an example of a rectifier circuit. FIG. 5 is a diagram illustrating an example of a rectifier circuit. FIG. 6 is a diagram illustrating a configuration example of the receiving circuit according to the first embodiment. FIG. 7 is a diagram illustrating voltage levels at various points in the receiving circuit when a unipolar signal is input. FIG. 8 is a diagram illustrating an example of a change in signal waveform due to a decrease in response speed of the photocoupler. FIG. 9 is a diagram illustrating an example of a change in signal waveform when the resistance value of the pull-up resistor is reduced. FIG. 10 is a diagram illustrating voltage levels at various points in the receiving circuit when a multipolar signal is input. FIG. 11 is a diagram illustrating a configuration example of a receiving circuit according to the second embodiment. FIG. 12 is a diagram illustrating a configuration example of a receiving circuit according to the third embodiment. FIG. 13 is a diagram illustrating a configuration example of a switch according to the third embodiment. FIG. 14 is a diagram illustrating a configuration example of a switch according to the third embodiment. FIG. 15 is a diagram illustrating a configuration example of a receiving circuit according to another embodiment. FIG. 16 is a diagram illustrating a configuration example of a receiving circuit according to another embodiment.

  An illumination control data signal receiving circuit according to an embodiment according to an embodiment described below includes a rectifier circuit, a constant current circuit, a pull-up resistor, and a switching unit. The rectifier circuit performs half-wave rectification on the data signal for illumination control. The constant current circuit is connected in series to the input side of the photocoupler to which the data signal for illumination control that has been half-wave rectified by the rectifier circuit is input, and the input current to the photocoupler is limited according to the single-pole signal. To do. The pull-up resistor is connected to the output side of the photocoupler. When the data signal is a bipolar signal, the switching unit switches the circuit configuration so that at least one of the resistance value of the constant current circuit and the resistance value of the pull-up resistor decreases.

  In the constant current circuit according to the embodiment described below, some resistors can be switched to a short-circuit state. The pull-up resistor is provided so that the resistor can be switched to a parallel state. When the data signal is a bipolar signal, the switching unit performs at least one of switching a part of the resistors of the constant current circuit to a short circuit state and switching the resistor to a parallel state with respect to the pull-up resistor. .

  In addition, the switching unit according to the embodiment described below includes an integration circuit and an AND circuit. The integrating circuit integrates the positive and negative signal components of the data signal, respectively. The AND circuit ANDs the positive and negative integration result signals from the integration circuit.

  Moreover, the switch part which concerns on embodiment described below switches a circuit structure according to the signal from the microcomputer of an illuminating device.

  In addition, the switching unit according to the embodiment described below switches the circuit configuration according to the setting of the switch that sets the type of the data signal.

  Hereinafter, an illumination system 1 according to an embodiment will be described with reference to the drawings. In addition, in embodiment, the same code | symbol is attached | subjected to the same site | part and the overlapping description is abbreviate | omitted.

(First embodiment)
First, the illumination system according to the first embodiment will be described with reference to FIGS.

[Configuration of lighting system]
FIG. 1 is a diagram illustrating a configuration example of a lighting system according to the first embodiment. A lighting system 1 shown in FIG. 1 is a system that realizes control and monitoring of a lighting device installed in a home or office. For example, the lighting system 1 may acquire information on an environment where the lighting device is installed using a sensor or the like, and may control the lighting device based on the acquired information.

  In the illumination system 1 shown in FIG. 1, a host device 2 and a plurality of communication units 3 and 4 are connected. Moreover, the communication part 3 is connected with the some illuminating devices 5-7. The communication unit 4 is connected to the lighting device 8. Moreover, the illuminating device 5 has LED9 which is an illumination part which illuminates arbitrary places, and the power supply control part 10 which controls LED9. Note that the communication unit 4 exhibits the same function as the communication unit 3 and will not be described below. Moreover, the following description is abbreviate | omitted as the illuminating devices 6-8 exhibit the same function as the illuminating device 5. FIG. Moreover, the number of the communication units 3 and 4 and the illumination devices 5 to 8 included in the illumination system 1 illustrated in FIG. 1 is merely an example, and can be appropriately changed according to the configuration of the illumination system 1.

  The host device 2 outputs a data signal that instructs the communication unit 3 and the communication unit 4 to control the lighting fixture. For example, the host device 2 outputs to the communication unit 3 a data signal instructing arbitrary control such as turning on / off the LED 9 of the lighting device 5, changing the illuminance, changing the color of light, and the like. For example, the host device 2 outputs a data signal based on a monopolar signal or a bipolar signal in order to control the lighting fixture. This unipolar signal is a signal whose voltage changes in one of the positive and negative ranges.For example, when the pulse is divided at a certain period, whether the falling edge exists or the rising edge exists Indicates. The bipolar signal is a signal whose voltage changes in a range of positive and negative polarities, and indicates the control content at the rising and falling positions of the voltage, for example.

  The communication unit 3 is a relay device that relays communication between the host device 2 and each of the lighting devices 5 to 7. For example, when the communication unit 3 receives a data signal indicating control for the LED 9 from the host device 2, the communication unit 3 outputs the received data signal to the lighting device 5 having the LED 9.

  The illuminating device 5 is an illuminating device installed in, for example, a house or an office, and includes an LED 9 that is replaceable illumination and a power supply control unit 10 that controls the LED 9. Moreover, the illuminating device 5 becomes a unit which performs installation or replacement | exchange, when installing and updating the illumination system 1, similarly to the conventional illuminating device. Here, since the conventional lighting device only supports data signals of a specific type of control method, it is necessary to have a different power control unit for each control method of the host device 2. For example, a conventional lighting device has to have different power supply control units depending on whether it is compatible with a monopolar signal or a bipolar signal.

  On the other hand, the power supply control unit 10 included in the lighting device 5 has a circuit configuration that can handle a single-pole signal and a double-pole signal with the same receiving circuit. The power supply control unit 10 derives the control content indicated by the received data signal and executes the control of the derived content on the LED 9 even when a data signal of a monopolar signal or a bipolar signal is input.

  In the illumination system 1 of the present embodiment, the first control signal is a unipolar signal with a limited input current and a slow transmission rate, and the second control signal is a complex signal with a relatively fast transmission rate without a limit on the input current. It can handle polar signals. In the following description, a simple unipolar signal refers to a unipolar signal with a limited input current and a low transmission rate, and a simple bipolar signal refers to a relative transmission rate with no input current limitation. A fast bipolar signal.

  For this reason, the illuminating device 5 can be supported by the same illuminating device 5 regardless of the type of control method of the host device 2. As a result, for example, when changing the control method of the host device 2, the lighting system 1 uses the new control method without replacing each of the lighting devices 5 to 8 with a lighting device corresponding to the new control method. Thus, each of the lighting devices 5 to 8 can be controlled. Moreover, the illumination system 1 should just install the illuminating device 5 instead of the failed illuminating device, without preparing the same illuminating device when one of the illuminating devices fails. As a result, the illumination system 1 can flexibly perform installation and replacement of the illumination devices 5 to 8.

[Configuration of Illumination Device 5]
Hereinafter, a configuration example of the power supply control unit 10 will be described with reference to FIG. FIG. 2 is a diagram illustrating a configuration example of the illumination device according to the first embodiment. As illustrated in FIG. 2, the power supply control unit 10 includes a power supply circuit 11, a reception circuit 12, and a microcomputer 13. Further, the power supply circuit 11 is connected to a power supply for power supplied to the LED 9.

[Power supply circuit 11]
The power supply circuit 11 is a circuit that changes the power supplied to the LED 9 in accordance with control by the microcomputer 13. For example, the power supply circuit 11 receives supply of power from a power supply. The power supply circuit 11 controls the amount of power supplied from the power supply to the LED 9 according to the control by the microcomputer 13, thereby turning on / off the LED 9, changing the illuminance, and changing the color of the light. Etc.

[Receiving circuit 12]
The receiving circuit 12 includes a rectifying circuit that rectifies the data signal received from the communication unit 3, and outputs the data signal rectified using the rectifying circuit to the microcomputer 13. Specifically, the receiving circuit 12 rectifies the data signal to the unipolar side so that the microcomputer 13 can identify the control content.

  Here, since the receiving circuit 12 does not know whether the host device 2 outputs a bipolar signal or a monopolar signal, it is necessary to appropriately rectify both the bipolar signal and the monopolar signal. However, when the data signal received from the communication unit 3 is simply full-wave rectified or half-wave rectified, the receiving circuit 12 may not be able to perform appropriate rectification depending on the type of the data signal.

  Hereinafter, the correspondence between the type of the data signal and the rectification method will be described with reference to FIGS. First, an example of a data signal output from the host device 2 will be described with reference to FIG. FIG. 3 is a diagram for explaining types of data signals according to the first embodiment. In FIG. 3, a plurality of examples of data signals output from the host device 2 are described.

  For example, as shown in FIG. 3A, the host device 2 may output a bipolar signal whose voltage changes in a range of positive and negative polarities as a data signal. Further, the host device 2 can be a unipolar signal whose voltage changes in a positive range as shown in FIG. 3B, or a voltage that changes in a negative range as shown in FIG. In some cases, a unipolar signal is output as a data signal.

  Next, an example of a rectifier circuit that rectifies a data signal will be described with reference to FIGS. 4 and 5. 4 and 5 are diagrams illustrating an example of the rectifier circuit. In the example shown in FIG. 4, an example of a rectifier circuit that rectifies the data signal in full wave is shown in FIG. 4D, and an example of a rectifier circuit that rectifies the data signal in half wave is shown in FIG. 4 and 5, the rectifier circuit is shown by the symbol of the diode and the diamond shape surrounding the diode. However, the rectifier circuit is not limited to the bridge type, and is a rectifier circuit using a transformer, for example. There may be. In the following description and drawings, the rectifier circuit is indicated by the same symbol as in FIGS. 4 and 5.

  For example, when rectifying the unipolar signals shown in (B) and (C) in FIG. 3, the receiving circuit 12 does not know whether the signal is output from the positive electrode side or the negative electrode side depending on the wiring direction. Therefore, the positive side of the data signal is input to the input # 1 of the circuit shown in FIGS. 4D and 4E, and the negative side of the data signal is input to the input # 2.

  As shown in FIG. 4D, when the rectifier circuit full-wave rectifies the single-pole signal on the positive electrode side or the single-pole signal on the negative electrode side, both from the output # 1 or the output # 4, the positive electrode side. The rectified data signal is output. However, as shown in FIG. 4E, when the double-pole signal is full-wave rectified, the signal on each pole side of the double-pole signal is concentrated on the positive electrode side, so that the output # 1 or output DC voltage is output from # 4. In such a case, since the microcomputer 13 cannot identify the control content from the data signal, the receiving circuit 12 cannot perform appropriate rectification in the circuit shown in FIG.

  On the other hand, for example, as shown in FIG. 5F, the rectifier circuit rectifies the data signal rectified from the output # 1 or the output # 2 to the unipolar side when half-wave rectification is performed on the input bipolar signal. Can output. On the other hand, as shown in FIG. 5G, when the rectifier circuit half-wave rectifies the positive-side unipolar signal or the negative-side unipolar signal, from the output # 1 or the output # 2, Although a data signal obtained by rectifying the positive-side single-pole signal to the positive-side can be output, the negative-side single-pole signal cannot be output. However, the rectifier circuit can output a data signal obtained by rectifying the single-polar signal on the negative electrode side to the negative electrode side from the output # 1 or the output # 3.

  Therefore, the receiving circuit 12 performs half-wave rectification of the data signal to generate signals on the positive electrode side and the negative electrode side.

  Next, a configuration example of the receiving circuit 12 will be described with reference to FIG. FIG. 6 is a diagram illustrating a configuration example of the receiving circuit according to the first embodiment. In the example illustrated in FIG. 6, the reception circuit 12 includes a rectification unit 20 having inputs # 1 and # 2 on each pole side of a data signal and having outputs # 1 to # 3. The rectifying unit 20 is a rectifying circuit realized by a circuit including a diode or a transformer connected in a bridge shape, for example, and is described by a symbol of the diode and a rhombus figure surrounding it. The rectifier 20 receives the positive side of the data signal as input # 1 and the negative side of the data signal as input # 2. The rectification unit 20 outputs a signal rectified from the output # 1 and the output # 2 to the positive side, and outputs a signal rectified from the output # 1 and the output # 3 to the negative side.

  The receiving circuit 12 includes a first signal processing unit 21, a second signal processing unit 22, and a switching unit 23.

  The first signal processing unit 21 is a processing unit that performs processing on the positive-side signal that has been half-wave rectified by the rectification unit 20. The first signal processing unit 21 includes a constant current circuit 30, a photocoupler 31, a Zener diode 32, and a pull-up resistor 33.

  The output # 1 of the rectifying unit 20 is connected to the anode of the Zener diode 32. The cathode of the Zener diode 32 is connected to the cathode of the light emitting diode provided in the photocoupler 31. The anode of the light emitting diode provided in the photocoupler 31 is connected to the constant current circuit 30. The constant current circuit 30 is connected to the output # 2 of the rectifying unit 20. The output side of the photocoupler 31 is configured as a collector load in which the emitter is grounded and the pull-up resistor 33 is connected to the collector signal line, and a signal is output from the collector.

  In the constant current circuit 30, resistors 34 and 35 are connected in series, and a Zener diode 36 is provided in parallel to the series circuit of the resistors 34 and 35. In the constant current circuit 30, the resistance values of the resistors 34 and 35 are set to values corresponding to the definition of the current value of the unipolar signal, and the current value of the input current that can be taken in from the data signal transmission source is limited. The constant current circuit 30 is provided with a switch 37 in parallel for short-circuiting both ends of one of the resistors 34 and 35. In this embodiment, a switch 37 for short-circuiting both ends is arranged in parallel with the resistor 34. Thus, in the constant current circuit 30, when the switch 37 is turned on, the resistor 34 is short-circuited, so that the resistance value is decreased and the limit of the current value of the input current is increased.

  The pull-up resistor 33 is provided in parallel with a series circuit in which a resistor 38 and a switch are connected in series. In this embodiment, a photocoupler 39 is used as this switch. In the receiving circuit 12, when the photocoupler 39 is turned on, the pull-up resistor 33 and the resistor 38 are in a parallel state, so that the resistance value of the pull-up resistor on the output side of the photocoupler 31 is lowered.

  The second signal processing unit 22 is a processing unit that performs processing on the negative-side signal that has been half-wave rectified by the rectification unit 20. The second signal processing unit 22 has the same configuration as the first signal processing unit 21, and includes a constant current circuit 40, a photocoupler 41, a Zener diode 42, and a pull-up resistor 43.

  The output # 1 of the rectifying unit 20 is connected to the anode of the Zener diode 42. The cathode of the Zener diode 42 is connected to the cathode of the light emitting diode provided in the photocoupler 41. The anode of the light emitting diode provided in the photocoupler 41 is connected to the constant current circuit 40. The constant current circuit 40 is connected to the output # 3 of the rectifying unit 20. The output side of the photocoupler 41 is configured as a collector load in which the emitter is grounded and the pull-up resistor 43 is connected to the collector signal line, and a signal is output from the collector.

  In the constant current circuit 40, resistors 44 and 45 are connected in series, and a Zener diode 46 is provided in parallel to the series circuit of the resistors 44 and 45. In the constant current circuit 40, the resistance values of the resistors 44 and 45 are set to values corresponding to the definition of the current value of the unipolar signal, and the current value of the input current that can be taken in from the data signal transmission source is limited. In addition, the constant current circuit 40 is provided with a switch 47 in parallel for short-circuiting both ends of one of the resistors 44 and 45. In this embodiment, a switch 47 that short-circuits both ends is arranged in parallel with the resistor 44. Accordingly, in the constant current circuit 40, when the switch 47 is turned on, the resistor 44 is short-circuited, so that the resistance value is decreased and the limit of the current value of the input current is increased.

  The pull-up resistor 43 is provided in parallel with a series circuit in which a resistor 48 and a switch are connected in series. In this embodiment, a photocoupler 49 is used as this switch. Thus, in the receiving circuit 12, when the photocoupler 49 is turned on, the pull-up resistor 43 and the resistor 48 are in parallel, so that the resistance value of the pull-up resistor on the output side of the photocoupler 41 decreases. Further, the receiving circuit 12 propagates the signal between the input side circuit and the output side circuit of the data signal through the photocouplers 31, 39, 41, and 49, so that the input side circuit and the output side circuit are electrically connected. Can be insulated.

  The switching unit 23 is a processing unit that switches a circuit configuration depending on whether an input data signal is a bipolar signal or a monopolar signal. The switching unit 23 includes two integrating circuits 50 and 51 and an AND circuit 52. The integrating circuit 50 is connected to the output # 2 of the rectifying unit 20, and outputs a voltage signal having a waveform equal to the time integration of the voltage waveform of the rectified signal on the positive side. The integrating circuit 51 is connected to the output # 3 of the rectifying unit 20, and outputs a voltage signal having a waveform equal to the time integral of the voltage waveform of the rectified signal on the negative electrode side. The integrating circuits 50 and 51 are connected to the AND circuit 52, and signals output from the AND circuits 52 are input to the AND circuit 52. The AND circuit 52 outputs a high level signal when both signals input from the integration circuits 50 and 51 are at a high level, and only one of the signals input from the integration circuits 50 and 51 is at a high level. Alternatively, when both signals input from the integrating circuits 50 and 51 are at a low level, a low level signal is output. The AND circuit 52 is connected to the photocouplers 39 and 49. The photocouplers 39 and 49 are turned on when a high level signal is input. That is, when a data signal of a bipolar signal is input to the receiving circuit 12, since the voltage of the data signal changes in a range of both positive and negative polarities, a high level signal is output from both the integrating circuits 50 and 51, and the AND circuit 52. , A high level signal is output, and the photocouplers 39 and 49 are turned on. On the other hand, the receiving circuit 12 outputs a high level signal from either the integrating circuit 50 or 51 because the voltage of the data signal changes in a positive or negative range when a data signal of a unipolar signal is input. However, since a low level signal is output from the AND circuit 52, the photocouplers 39 and 49 are turned off.

[Procedure for Processing by Lighting System 1]
Next, a flow in which the receiving circuit 12 according to the first embodiment processes a data signal will be described. First, the flow of processing when a unipolar signal is input as a data signal to the receiving circuit 12 will be described. FIG. 7 is a diagram illustrating voltage levels at various points in the receiving circuit when a unipolar signal is input. FIG. 7 shows changes in voltage levels (1) to (5) of the receiving circuit 12 shown in FIG.

  For example, when a single-pole signal on the positive side indicated by “input” in FIG. 7 is input, the receiving circuit 12 is rectified from output # 1 and output # 2 to the positive side indicated by “(1) output 1” in FIG. Output the signal. The integration circuit 50 integrates the signal indicated by “(1) output 1” in FIG. 7 and outputs a high level signal indicated by “(2) integration output 1” in FIG.

  On the other hand, since the rectification unit 20 performs half-wave rectification on the unipolar signal on the positive electrode side, the signals output from the output # 1 and the output # 3 are set to the GND level as shown in “(3) Output 2” of FIG. Become. The integration circuit 51 integrates the signal indicated by “(3) output 2” in FIG. 7 and outputs a low level signal indicated by “(4) integration output 2” in FIG.

  Since the signal input from the integration circuit 51 is at a low level, the AND circuit 52 outputs a low level signal shown in “(5) SW control output” in FIG. As a result, the photocouplers 39 and 49 are turned off.

  The first signal processing unit 21 processes the signal on the positive electrode side subjected to half-wave rectification by the rectification unit 20 and outputs the processed signal to the microcomputer 13. For example, the first signal processing unit 21 turns on the photocoupler 31 according to the positive-side signal half-wave rectified by the rectifying unit 20, and the voltage level of the output-side signal when the photocoupler 31 is turned on. Therefore, a waveform signal corresponding to the input data signal can be output to the microcomputer 13. At this time, since the resistance values of the resistors 34 and 35 of the constant current circuit 30 are the values corresponding to the definition of the current value of the unipolar signal, the first signal processing unit 21 simply receives the input current taken from the transmission source. The current value corresponding to the polar signal can be limited. Further, since the first signal processing unit 21 increases the value of the pull-up resistor 33 so that a signal with sufficient amplitude can be output even with a unipolar signal, it can output a signal with sufficient amplitude.

  When the single signal on the positive electrode side is input to the receiving circuit 12, the second signal processing unit 22 has a low level as indicated by “(4) integration output 2” in FIG. The signal output to 13 remains at a low level. When a negative-polarity unipolar signal is input to the receiving circuit 12, the second signal processing unit 22 is similar to the first signal processing unit 21 with respect to the negative-polarity signal subjected to half-wave rectification by the rectification unit 20. The signal of the waveform corresponding to the input data signal is output to the microcomputer 13.

  Here, the circuit design of the receiving circuit 12 is restricted due to the limited input current. For example, the receiving circuit 12 is a constant current circuit 30 and needs to determine a resistance value so as to correspond to the limit of the input current. In the receiving circuit 12, the resistance values of the resistors 34 and 35 are values corresponding to the definition of the current value of the unipolar signal. In addition, the receiving circuit 12 needs to increase the resistance value of the pull-up resistor 33 in order to output a signal having a sufficient amplitude even when the input current is limited.

  However, in the receiving circuit 12, when the value of the pull-up resistor 33 is increased in this way, the response speed of the photocoupler 31 decreases. However, even if the unipolar signal is a low-speed data signal and there is no problem even if the response speed is slow, if the bipolar signal is a high-speed data signal relative to the unipolar signal, However, transmission may not be successful even under conditions that do not pose a problem with a unipolar signal.

  FIG. 8 is a diagram illustrating an example of a change in signal waveform due to a decrease in response speed of the photocoupler. For example, as shown in FIG. 8H, the delay of the falling edge of the output signal waveform may increase with respect to the rising edge of the input signal waveform. Further, as indicated by (I) in FIG. 8, the rising and falling delay amounts of the input signal waveform may change, and the output waveform may change with respect to the input.

  Therefore, in the receiving circuit 12, if the resistance value of the pull-up resistor 33 is reduced in order to suppress a decrease in the response speed of the photocoupler 31, a signal having a sufficient amplitude cannot be output.

  FIG. 9 is a diagram illustrating an example of a change in signal waveform when the resistance value of the pull-up resistor is reduced. For example, even when a signal having an amplitude as shown in FIG. 9 (J) is input and the photocoupler 31 is turned on, the voltage drop at the pull-up resistor 33 is small, so as shown in FIG. 9 (K). Therefore, a signal with sufficient amplitude cannot be output. In the waveform shown in FIG. 9 (K), the microcomputer 13 may not be able to read the waveform because the low level is too high. Therefore, in the receiving circuit 12, it is conceivable to increase the output current while maintaining the value of the pull-up resistor 33 in order to suppress a decrease in response speed. However, it is necessary to increase the input current, and the control signal If there is a current limit in the standard, it will not be possible to observe this.

  Therefore, in the receiving circuit 12 according to the first embodiment, when the data signal is a bipolar signal, the circuit configuration is switched so that the resistance value of the constant current circuit 40 and the resistance value of the pull-up resistor 33 are lowered.

  Next, the flow of processing when a bipolar signal is input to the receiving circuit 12 as a data signal will be described. FIG. 10 is a diagram illustrating voltage levels at various points in the receiving circuit when a multipolar signal is input. FIG. 10 shows changes in voltage levels (1) to (5) of the receiving circuit 12 shown in FIG.

  For example, when a multipolar signal indicated by “input” in FIG. 10 is input to the receiving circuit 12, the signal rectified from the output # 1 and output # 2 to the positive side indicated by “(1) output 1” in FIG. Output. The integrating circuit 50 integrates the signal indicated by “(1) output 1” in FIG. 10 and outputs a high level signal indicated by “(2) integrated output 1” in FIG.

  When the bipolar signal indicated by “input” in FIG. 10 is input, the rectifying unit 20 rectifies the negative electrode indicated by “(3) output 2” in FIG. 10 from the output # 1 and output # 3 to the positive electrode side. Output a signal. The integrating circuit 51 integrates the signal indicated by “(3) output 2” in FIG. 10, and outputs a high level signal indicated by “(4) integrated output 2” in FIG.

  The AND circuit 52 outputs a high-level signal shown in “(5) SW control output” in FIG. 10 because the signals input from the integrating circuits 50 and 51 are both at a high level. As a result, the photocouplers 39 and 49 are turned on.

  The first signal processing unit 21 processes the signal on the positive electrode side subjected to half-wave rectification by the rectification unit 20 and outputs the processed signal to the microcomputer 13. For example, the first signal processing unit 21 turns on the photocoupler 31 according to the positive-side signal half-wave rectified by the rectifying unit 20, and the voltage level of the output-side signal when the photocoupler 31 is turned on. Therefore, a waveform signal corresponding to the input data signal can be output to the microcomputer 13. At this time, since the resistance value of the pull-up resistor 33 is reduced in the first signal processing unit 21, it is possible to suppress a decrease in the response speed of the photocoupler 31. Further, in the first signal processing unit 21, the resistance 34 of the constant current circuit 30 is short-circuited and the resistance value of the constant current circuit 30 decreases, so that the input current to the photocoupler 31 increases and the response speed of the photocoupler 31 is increased. Will improve. Further, since the first signal processing unit 21 increases the input current to the photocoupler 31 and can increase the current that flows when the photocoupler 31 is turned on, a signal having a sufficient amplitude can be output.

  In this way, the receiving circuit 12 performs half-wave rectification of the data signal input from the communication unit 3 and outputs positive and negative signals to the microcomputer 13. For example, in the case of a bipolar signal, the receiving circuit 12 outputs a signal having a waveform from each of the first signal processing unit 21 and the second signal processing unit 22. In addition, the receiving circuit 12 outputs a signal having a waveform from the first signal processing unit 21 in the case of a unipolar signal on the positive electrode side. In the case of a unipolar signal on the negative electrode side, the receiving circuit 12 outputs a signal having a waveform from the second signal processing unit 22.

  The microcomputer 13 is a control method in which the signal is a bipolar signal, a single-polar signal on the positive electrode side, or a single-polar signal on the negative electrode side from the input state of the signals from the first signal processing unit 21 and the second signal processing unit 22. And the control content is identified from the signal according to the signal control method. Then, the microcomputer 13 controls the power supply circuit 11 in accordance with the identified control contents to turn on / off the LED 9, change the illuminance, change the light color, and the like.

[Effect of the first embodiment]
As described above, the receiving circuit 12 according to the first embodiment includes the rectifying unit 20, the constant current circuits 30 and 40, the pull-up resistors 33 and 43, and the switching unit 23. The rectification unit 20 performs half-wave rectification on the data signal for illumination control. The constant current circuits 30 and 40 are connected in series to the input side of the photocouplers 31 and 41 to which the data signal for illumination control that has been half-wave rectified by the rectifier 20 is input, and are input to the photocouplers 31 and 41. Limit current to a single pole signal. The pull-up resistors 33 and 43 are connected to the output side of the photocouplers 31 and 41. When the data signal is a bipolar signal, the switching unit 23 switches the circuit configuration so that at least one of the resistance values of the constant current circuits 30 and 40 and the resistance values of the pull-up resistors 33 and 43 decreases. As a result, the receiving circuit 12 according to the first embodiment can cope with a unipolar signal and a bipolar signal with the same circuit.

  In the constant current circuits 30 and 40 according to the first embodiment, some of the resistors can be switched to a short-circuit state. The pull-up resistors 33 and 43 are provided so that the resistors can be switched to a parallel state. When the data signal is a bipolar signal, the switching unit 23 switches a part of the resistors of the constant current circuits 30 and 40 to a short-circuited state, and switches the resistance of the pull-up resistors 33 and 43 to a parallel state. At least one of the switching is performed. Thereby, the receiving circuit 12 according to the first embodiment can reduce at least one of the resistance values of the constant current circuits 30 and 40 and the resistance values of the pull-up resistors 33 and 43 with a simple configuration.

  The switching unit 23 according to the first embodiment includes integrating circuits 50 and 51 and an AND circuit 52. The integrating circuits 50 and 51 integrate the positive and negative signal components of the data signal, respectively. The AND circuit 52 ANDs the positive and negative integration result signals from the integration circuits 50 and 51. Thereby, the receiving circuit 12 according to the first embodiment can identify the control method of the data signal and switch the circuit configuration.

(Second Embodiment)
Next, the illumination system according to the second embodiment will be described with reference to FIG. In the second embodiment, a case where the microcomputer 13 instructs switching of the circuit configuration will be described.

  The configurations of the illumination system 1 and the power supply control unit 10 according to the second embodiment are the same as the configurations of the illumination system 1 and the power supply control unit 10 according to the first embodiment shown in FIGS. Is omitted.

[Configuration of Receiver Circuit 12 According to Second Embodiment]
FIG. 11 is a diagram illustrating a configuration example of a receiving circuit according to the second embodiment. The configuration of the receiving circuit 12 according to the second embodiment is the same as the configuration of the receiving circuit 12 according to the first embodiment shown in FIG. Explanation of similar functions and configurations will be omitted.

  The receiving circuit 12 according to the second embodiment receives a signal instructing switching of the circuit configuration from the microcomputer 13. The photocouplers 39 and 49 receive a signal instructing switching of the circuit configuration from the microcomputer 13 and can be switched on and off under the control of the microcomputer 13.

  When the data signal is input, the receiving circuit 12 performs half-wave rectification of the input data signal and outputs positive and negative signals to the microcomputer 13. The microcomputer 13 recognizes signals input from the first signal processing unit 21 and the second signal processing unit 22. When the microcomputer 13 recognizes the signal, the microcomputer 13 controls the power supply circuit 11 according to the identified control content to turn on / off the LED 9, change the illuminance, change the color of the light, and the like. On the other hand, when the microcomputer 13 cannot recognize the signal, the microcomputer 13 outputs a signal instructing the switching of the circuit configuration to the receiving circuit 12 to switch the circuit configuration of the receiving circuit 12, and the first signal processing unit 21 whose circuit configuration has been switched. And the signal input from the 2nd signal processing part 22 is recognized. That is, in the receiving circuit 12 according to the second embodiment, the switching of the circuit configuration of the receiving circuit 12 is instructed according to whether the microcomputer 13 can recognize the signal.

  For example, when the data signal input to the receiving circuit 12 is a positive-side unipolar signal or a negative-side unipolar signal, the receiving circuit 12 receives a unipolar signal from the first signal processing unit 21 or the second signal processing unit 22. A signal corresponding to the waveform is output. When the data signal is a unipolar signal, the microcomputer 13 can recognize the control content by recognizing the waveform of the signal input from the first signal processing unit 21 and the second signal processing unit 22. On the other hand, when the control content cannot be recognized, the microcomputer 13 outputs a signal instructing the receiving circuit 12 to switch the circuit configuration. When the data signal input to the receiving circuit 12 is a bipolar signal, the receiving circuit 12 outputs a signal corresponding to the waveform of the bipolar signal from the first signal processing unit 21 and the second signal processing unit 22. When the data signal is a bipolar signal, the microcomputer 13 can recognize the control content by recognizing the waveforms of the signals input from the first signal processing unit 21 and the second signal processing unit 22.

[Effects of Second Embodiment]
As described above, the switching unit 23 according to the second embodiment switches the circuit configuration according to the signal from the microcomputer 13 of the lighting device 5. Thereby, the receiving circuit 12 according to the second embodiment can switch the circuit configuration so as to correspond to the control method of the data signal by the control from the microcomputer 13.

(Third embodiment)
Next, the illumination system according to the third embodiment will be described with reference to FIGS. In the third embodiment, a case where switching of the circuit configuration can be set by a switch will be described.

  The configurations of the illumination system 1 and the power supply control unit 10 according to the third embodiment are the same as the configurations of the illumination system 1 and the power supply control unit 10 according to the first embodiment shown in FIGS. Is omitted.

[Configuration of Reception Circuit 12 According to Third Embodiment]
FIG. 12 is a diagram illustrating a configuration example of a receiving circuit according to the third embodiment. The configuration of the receiving circuit 12 according to the third embodiment is the same as the configuration of the receiving circuit 12 according to the first embodiment shown in FIG. Explanation of similar functions and configurations will be omitted.

  The receiving circuit 12 according to the third embodiment receives a signal instructing switching of the circuit configuration. For example, the illumination device 5 is provided with a switch for setting the type of the data signal from the outside, and the setting of the switch can be changed by an installer who installs the illumination. The installer sets the switch according to the data signal control method used by the lighting system 1.

  FIG. 13 and FIG. 14 are diagrams illustrating a configuration example of a switch according to the third embodiment. In the example shown in FIG. 13, a pull-up resistor 60 is provided, and a switch 62 is provided on a wiring 61 connected to the microcomputer 13. The microcomputer 13 detects the signal level of the wiring 61 to identify the state of the switch 62 and outputs a signal instructing switching of the circuit configuration to the receiving circuit 12 according to the state of the switch 62.

  On the other hand, in the example shown in FIG. 14, the pull-up resistor 60 is provided and the wiring 61 is connected to the receiving circuit 12, and the signal level of the wiring 61 instructs switching of the circuit configuration according to the state of the switch 62. Is output to the receiving circuit 12.

  The receiving circuit 12 switches the circuit configuration according to a signal instructing switching. The receiving circuit 12 performs half-wave rectification of the data signal input from the communication unit 3 and outputs positive and negative signals to the microcomputer 13. The microcomputer 13 can recognize the control content when the switch 62 is set correctly.

[Effect of the third embodiment]
As described above, the switching unit 23 according to the third embodiment switches the circuit configuration according to the setting of the switch 62 that sets the type of the data signal. Thereby, the receiving circuit 12 according to the second embodiment can cope with a single-pole signal and a double-pole signal with the same circuit by appropriately setting the switch 62.

(Other embodiments)
The illumination system 1 described above may be implemented in various different forms other than the above embodiment. Therefore, in the following, various modified examples of the illumination system 1 will be described.

  In the example described above, an example in which the reception circuit 12 includes the first signal processing unit 21 and the second signal processing unit 22 has been described. However, the embodiment is not limited to this. That is, the receiving circuit 12 may have only one of the first signal processing unit 21 and the second signal processing unit 22. For example, if the reception circuit 12 does not need to process the signal on the negative electrode side, the second signal processing unit 22 may be omitted. For example, the receiving circuit 12 inputs the positive side of the data signal to the input # 1, inputs the negative side of the data signal to the input # 2, and the input data signal is a single-pole signal or a bipolar signal on the positive side. In some cases, the second signal processing unit 22 may be omitted.

  In the above-described example, the example in which the circuit configuration is switched so that both the resistance values of the constant current circuits 30 and 40 and the resistance values of the pull-up resistors 33 and 43 are reduced is described. However, the embodiment is not limited to this. That is, the circuit configuration may be switched so that one of the resistance value of the constant current circuits 30 and 40 or the resistance value of the pull-up resistors 33 and 43 decreases. For example, the receiving circuit 12 may be configured to reduce the resistance value of the constant current circuit. FIG. 15 is a diagram illustrating a configuration example of a receiving circuit according to another embodiment. In the example of FIG. 15, a switch 37 that short-circuits both ends is provided in parallel with a part of the resistor 34 of the constant current circuit 30, and a switch 47 that short-circuits both ends of the constant current circuit 40 is provided in parallel. Thus, the circuit configuration is such that the resistance values of the constant current circuits 30 and 40 can be lowered by the switches 37 and 47. For example, the receiving circuit 12 may be configured to be able to reduce the resistance value of the pull-up resistor. FIG. 16 is a diagram illustrating a configuration example of a receiving circuit according to another embodiment. Note that the resistor 34 in FIG. 16 has the same resistance value as the resistors 34 and 35 in the first to third embodiments. The resistor 44 has the same resistance value as the resistors 44 and 45 of the first to third embodiments. In the example of FIG. 16, a series circuit in which a resistor 38 and a photocoupler 39 are connected in series to the pull-up resistor 33 is provided in parallel, and a series circuit in which a resistor 48 and a photocoupler 49 are connected in series to the pull-up resistor 43 is provided in parallel. The circuit configuration is such that the resistance values of the pull-up resistors 33 and 43 can be lowered by the photocouplers 39 and 49. Also for the receiving circuit according to the second embodiment shown in FIG. 11 and the receiving circuit according to the third embodiment shown in FIG. 12, the resistance values of the constant current circuits 30 and 40 or the resistances of the pull-up resistors 33 and 43 are the same. The circuit configuration may be switched so that one of the values decreases.

  As mentioned above, although embodiment of this invention was described, embodiment is shown as an example and is not intending limiting the range of invention. The embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. The embodiments and the modifications thereof are included in the scope of the invention and the scope of the invention, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 Lighting system 2 Host apparatus 3, 4 Communication part 5 Lighting apparatus 10 Power supply control part 11 Power supply circuit 12 Reception circuit 13 Microcomputer 20 Rectification part 21 1st signal processing part 22 2nd signal processing part 23 Switching part 30, 40 Constant current circuit 31, 41 Photocoupler 32, 42 Zener diode 33, 43 Pull-up resistor 34, 44 Resistor 36, 46 Zener diode 37, 47 Switch 38, 48 Resistor 39, 49 Photocoupler 50, 51 Integration circuit 52 AND circuit 60 Pull-up resistor 61 Wiring 62 Switch

Claims (5)

A rectifier circuit for half-wave rectifying the data signal for lighting control;
A first control that is connected in series to the input side of a photocoupler to which a data signal for illumination control that has been half-wave rectified by the rectifier circuit is input, and that has a current value limit of the control signal for the input current to the photocoupler A constant current circuit for limiting in response to the signal;
A pull-up resistor connected to the output side of the photocoupler;
When the data signal is a second control signal having no control signal current value limitation and a transmission speed faster than the first control signal, at least a resistance value of the constant current circuit and a resistance value of the pull-up resistor A switching unit for switching the circuit configuration so that one of them is lowered;
An illumination control data signal receiving circuit comprising: In the constant current circuit, some resistors can be switched to a short-circuit state,
The pull-up resistor is provided so that the resistor can be switched to a parallel state,
When the data signal is a second control signal, the switching unit switches the partial resistance of the constant current circuit to a short-circuited state, and enters the parallel state of the resistor with respect to the pull-up resistor. The illumination control data signal receiving circuit according to claim 1, wherein at least one of the switching is performed. The switching unit is
An integrating circuit for integrating the positive and negative signal components of the data signal, respectively;
An AND circuit for ANDing signals of positive and negative integration results by the integration circuit;
The data signal receiving circuit for illumination control according to claim 1 or 2, further comprising:   The lighting control data signal receiving circuit according to claim 1, wherein the switching unit switches a circuit configuration according to a signal from a microcomputer of the lighting device.   The illumination control data signal receiving circuit according to claim 1, wherein the switching unit switches a circuit configuration according to a setting of a switch that sets a type of the data signal.

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