JP6278314B2 - Lighting device and lighting apparatus using the same - Google Patents

Description

  The present invention relates to a lighting device for lighting a light source unit and a lighting fixture using the same.

  Conventionally, the illumination system provided with the lighting fixture and the light control device which dimmes a lighting fixture is proposed (for example, patent document 1).

  In a lighting fixture in the lighting system described in Patent Document 1 (hereinafter, “lighting fixture of a conventional example”), a series circuit of a dimmer and a commercial power supply is electrically connected. The dimmer is equipped with a triac.

  The conventional lighting fixture includes a light source unit and a dimming switch unit. The dimming switch unit is configured to turn on / off the power supply to the light source unit.

  Moreover, the lighting fixture of a prior art example is provided with the rectification | straightening part, the smoothing part, the voltage detection part, and the light control part. The rectifying unit is configured to rectify an AC voltage supplied from a commercial power source. The smoothing unit is configured to smooth the output of the rectifying unit and output it to the light source unit. The voltage detection unit is configured to detect the output voltage of the rectification unit. The dimming control unit is configured to detect the conduction angle of the triac based on a period during which the voltage is detected by the voltage detection unit. Further, the dimming control unit is configured to dimm the light source unit by switching on / off of the dimming switch unit with a duty ratio based on the conduction angle.

JP 2012-185998 A

  In the lighting fixture of the conventional example, the dimming control unit switches on / off of the dimming switch unit based on the dimming ratio of the light source unit corresponding to the period in which the voltage is detected by the voltage detection unit.

  However, in the conventional lighting apparatus, for example, when noise is superimposed on the power supply line of the commercial power supply at the time of the zero crossing of the AC voltage of the commercial power supply, the voltage detection period may vary. . Thereby, the dimming control unit may switch the dimming switch unit on / off based on an incorrect dimming ratio.

  The objective of this invention is providing the lighting device which can suppress the misdetection of the light control ratio which determines the light output of a light source part, and a lighting fixture using the same.

The lighting device of the present invention is a lighting device for lighting a light source unit including a solid light emitting element. A lighting device of the present invention includes a pair of terminals to which a series circuit of a light control device having a switching device and an AC power supply is connected, a first rectifier circuit for full-wave rectification of a phase-controlled AC voltage, And a power conversion circuit that converts the voltage that has been full-wave rectified by the first rectifier circuit into a predetermined DC voltage or a predetermined DC current. The lighting device of the present invention includes a control circuit that controls the power conversion circuit, a second rectifier circuit that full-wave rectifies the phase-controlled AC voltage, and a voltage that is full-wave rectified by the second rectifier circuit. And a determination circuit. The determination circuit includes a period from a time point when the voltage detected by the detection circuit becomes larger than a preset first threshold value to a time point when the voltage detected by the detection circuit falls to a preset second threshold value. A period is detected, and it is determined whether or not the period is a conduction period in which the switching device is in a conduction state in a half cycle of the AC voltage of the AC power supply . The first rectifier circuit and the second rectifier circuit, when the series circuit between the AC power source and the dimmer is connected between the pair of terminals, a full-wave rectifying the phase controlled AC voltage Is configured to do. The power conversion circuit includes a switching element. Said control circuit, when said said period by determining circuit is determined to be the conduction period, based on the determined the period and the a conduction period, and controls the switching element.

  The lighting fixture of this invention is equipped with the said light source part, the said lighting device which lights the said light source part, and the fixture main body to which the said light source part is attached.

  In the lighting device of the present invention, it is possible to suppress erroneous detection of the dimming ratio that determines the light output of the light source unit.

  In the lighting fixture of this invention, the lighting fixture provided with the lighting device which can suppress the misdetection of the light control ratio which determines the light output of a light source part can be provided.

It is a schematic circuit diagram of the lighting fixture provided with the lighting device of this embodiment. It is a schematic circuit diagram explaining the bleeder circuit in the lighting fixture of this embodiment. It is a schematic circuit diagram of the illumination system provided with the lighting fixture of this embodiment. It is a wave form diagram which shows the voltage applied to the lighting device of this embodiment, the voltage applied to the conversion part in a light modulation apparatus, and the voltage detected by the detection circuit of the lighting device regarding the lighting device of this embodiment. It is explanatory drawing explaining the determination method by a determination circuit regarding the lighting device of this embodiment. It is explanatory drawing explaining the other determination method by a determination circuit regarding the lighting device of this embodiment. It is explanatory drawing explaining another determination method by a determination circuit regarding the lighting device of this embodiment. It is a schematic side view in the construction state of the lighting fixture of this embodiment.

  Below, the lighting device 22 of this embodiment is demonstrated, referring FIGS. In the following, for convenience of explanation, the lighting system 30 including the lighting fixture 20 of the present embodiment will be described in detail with reference to FIG.

  The lighting system 30 includes a lighting fixture 20 and a light control device 10. The lighting fixture 20 is electrically connected to a series circuit of an AC power source 40 that outputs a sinusoidal AC voltage and the light control device 10. The dimmer 10 is configured to control the phase of the AC voltage of the AC power supply 40. The AC power source 40 is, for example, a commercial power source. The light control device 10 is, for example, a light control device. In the following, for convenience of explanation, the phase-controlled AC voltage may be referred to as “phase control voltage”. The voltage waveform of the phase control voltage includes a voltage waveform corresponding to a half cycle of the AC voltage in the voltage waveform of the AC voltage.

  As shown in FIG. 3, the light control device 10 includes a pair of terminals 1 </ b> A and 1 </ b> B, a filter circuit 2, a switching device 3, a control circuit 4, a power supply circuit 5, and a setting unit 6.

  A filter circuit 2 is electrically connected between the pair of terminals 1A and 1B. The switching device 3 is electrically connected between the pair of terminals 1A and 1B. Furthermore, the power supply circuit 5 is electrically connected between the pair of terminals 1A and 1B.

  A series circuit of the AC power supply 40 and the lighting fixture 20 can be electrically connected between the pair of terminals 1A and 1B. Hereinafter, for convenience of explanation, the terminal 1A of the pair of terminals 1A and 1B may be referred to as “first connection terminal 1A”, and the terminal 1B may be referred to as “second connection terminal 1B”.

  The filter circuit 2 is configured to remove noise. The filter circuit 2 is, for example, an LC circuit including a first capacitor C1 and a first inductor L1. The first capacitor C1 is electrically connected between the pair of terminals 1A and 1B. The first end of the first inductor L1 is electrically connected to the second connection terminal 1B.

  The switching device 3 is, for example, a bidirectional thyristor. The first main terminal of the bidirectional thyristor is electrically connected to the first connection terminal 1A. The second main terminal of the bidirectional thyristor is electrically connected to the second end of the first inductor L1. A control terminal of the bidirectional thyristor is electrically connected to the control circuit 4. In the light control device 10, although the bidirectional thyristor is used as the switching device 3, it is not limited to this. For example, the switching device 3 may have a configuration in which two n-channel MOSFETs are connected in reverse series. For example, the switching device 3 may have a configuration in which two n-channel MOSFETs are connected in reverse series by connecting the source electrodes to each other.

  The control circuit 4 is configured to control the switching device 3. The control circuit 4 includes a control unit 8, a first diode D1, and a synchronization signal generation unit 9.

  The anode of the first diode D1 is electrically connected to the first connection terminal 1A. The cathode of the first diode D1 is electrically connected to the synchronization signal generator 9. The synchronization signal generator 9 is electrically connected to the controller 8. Further, the synchronization signal generation unit 9 is electrically connected to the ground of the light control device 10.

  The synchronization signal generator 9 is configured to generate a synchronization signal based on the magnitude of the AC voltage of the AC power supply 40. Further, the synchronization signal generation unit 9 is configured to output the synchronization signal to the control unit 8. The synchronization signal is, for example, a first PWM signal.

  The synchronization signal generator 9 sets the output level of the synchronization signal to a high level only during a period in which the AC voltage of the AC power supply 40 exceeds a preset value.

  The control unit 8 is configured to control the switching device 3. The control unit 8 is, for example, a first microcomputer on which a first program is installed. For example, the first program is stored in a first memory (not shown) provided in advance in the first microcomputer. In the light control device 10, the first microcomputer is used as the control unit 8. However, the present invention is not limited to this. The control unit 8 may be, for example, a first control IC (Integrated Circuit).

  The control unit 8 is configured to control the phase of the AC voltage of the AC power supply 40 by controlling the switching device 3. Phase control refers to, for example, switching the switching device 3 from the conductive state to the cutoff state when the AC voltage of the AC power supply 40 is zero, and switching the switching device 3 from the cutoff state to the conductive state when the synchronization signal rises. This means that the AC voltage of the power supply 40 is controlled.

  The power supply circuit 5 is configured to supply power to the control circuit 4. More specifically, the power supply circuit 5 is configured to generate a predetermined DC voltage V1 (hereinafter, “first DC voltage V1”) from the phase control voltage. The power supply circuit 5 is configured to supply the first DC voltage V <b> 1 to the control circuit 4. In short, the power supply circuit 5 is configured to generate the first DC voltage V1 from the AC voltage of the AC power supply 40 and supply the first DC voltage V1 to the control circuit 4.

  The power supply circuit 5 includes a rectifying / smoothing circuit 11, a conversion unit 12, and a second capacitor C2.

  The rectifying / smoothing circuit 11 is configured to rectify and smooth the phase control voltage. The rectifying / smoothing circuit 11 includes, for example, a second diode D2 and a third capacitor C3. The rectifying / smoothing circuit 11 includes the second diode D2 and the third capacitor C3, but this is not particularly limited.

  The converter 12 is configured to convert the voltage rectified and smoothed by the rectifying and smoothing circuit 11 into the first DC voltage V1. The conversion unit 12 is, for example, a DC-DC converter. The first input terminal of the pair of input terminals of the DC-DC converter is electrically connected to the cathode of the second diode D2. The anode of the second diode D2 is electrically connected to the first connection terminal 1A. The second input terminal of the pair of input terminals of the DC-DC converter is electrically connected to the second terminal of the first inductor L1. A third capacitor C3 is electrically connected between the pair of input terminals of the DC-DC converter.

  The second capacitor C2 is electrically connected between the pair of output terminals of the DC-DC converter. A terminal on the high potential side of the second capacitor C <b> 2 is electrically connected to the control unit 8. The terminal on the low potential side of the second capacitor C2 is electrically connected to the ground of the dimmer 10.

  The setting unit 6 is configured to set the conduction angle of the switching device 3. The setting unit 6 includes a variable resistor 13 and an operation unit (not shown). The conduction angle of the switching device 3 corresponds to a period in which the switching device 3 is in a conduction state. The operation unit is attached to a volume (not shown) of the variable resistor 13.

  The variable resistor 13 is configured to vary the resistance value for setting the second DC voltage V <b> 2 corresponding to the conduction angle of the switching device 3. The variable resistor 13 is, for example, a potentiometer having three terminals. The potentiometer is used as a voltage divider. In the potentiometer, two terminals (hereinafter, “first terminal” and “second terminal”) are connected to both ends of the resistance element, and the remaining terminals (hereinafter, “third terminal”) are mechanically moved along the resistance element. It is connected to a sliding contact that can move to.

  The first terminal of the potentiometer is electrically connected to the high potential side terminal of the second capacitor C2. The second terminal of the potentiometer is electrically connected to the ground of the light control device 10. The third terminal of the potentiometer is electrically connected to the control unit 8. In the dimmer 10, the voltage value of the second DC voltage V <b> 2 is determined by the resistance value of the variable resistor 13. That is, in the dimmer 10, the magnitude of the conduction angle of the switching device 3 is determined by the resistance value of the variable resistor 13.

  In the light control device 10, the resistance value of the variable resistor 13 is changed by operating the operation unit. In other words, in the light control device 10, the magnitude | size of the conduction angle of the switching apparatus 3 is changed by operating the said operation part.

  The controller 8 is configured to output the second PWM signal. A first data table (not shown) is stored in the first memory of the first microcomputer which is the control unit 8. The first data table is a data table in which the voltage value of the second DC voltage V2 is associated with the on-duty ratio of the second PWM signal on a one-to-one basis. The on-duty ratio of the second PWM signal corresponds to the conduction angle of the switching device 3. The on-duty ratio of the second PWM signal is set so as to decrease as the voltage value of the second DC voltage V2 increases.

  The controller 8 is configured to output a second PWM signal having an on-duty ratio corresponding to the voltage value of the second DC voltage V2 to the switching device 3 based on the first data table. In other words, the control unit 8 is configured to output a second PWM signal having an on-duty ratio corresponding to the conduction angle of the switching device 3 set by the setting unit 6 to the switching device 3.

  The control unit 8 is configured such that the synchronization signal is input from the synchronization signal generation unit 9. The control unit 8 outputs the second PWM signal to the switching device 3 so as to synchronize the rising edge of the synchronization signal and the rising edge of the second PWM signal.

  Based on the second PWM signal output from the control unit 8, the switching device 3 enters a conduction state or a cutoff state.

  For example, as illustrated in FIG. 1, the lighting device 22 is configured to light a light source unit 21 including a plurality of solid state light emitting elements 25. Each solid light emitting element 25 is, for example, an LED (Light Emitting Diode). The electrical connection relationship of each solid state light emitting element 25 is, for example, a series connection. The lighting device 22 does not include the light source unit 21 as a constituent element.

  The electrical connection relationship of each solid state light emitting element 25 is a series connection, but is not limited thereto. The electrical connection relationship between the solid-state light emitting elements 25 may be, for example, parallel connection. Further, the electrical connection relationship of each solid state light emitting element 25 may be, for example, a combination of a series connection and a parallel connection. The emission color of each solid state light emitting element 25 is, for example, white, but this color is not particularly limited. Each solid light emitting element 25 is an LED, but is not limited thereto. Each solid light emitting element 25 may be, for example, an organic electroluminescence element. The number of solid state light emitting elements 25 is not limited to a plurality, and may be one.

  The lighting device 22 includes a pair of terminals 42A and 42B, a filter circuit 32, a first rectifier circuit 33, a power conversion circuit 34, a control circuit 38, a second rectifier circuit 36, a detection circuit 35, and a determination circuit. 41. Hereinafter, for convenience of explanation, the terminal 42A of the pair of terminals 42A and 42B may be referred to as a “first input terminal 42A” and the terminal 42B may be referred to as a “second input terminal 42B”.

  A series circuit of the AC power supply 40 and the light control device 10 can be electrically connected between the pair of terminals 42A and 42B. Note that the lighting device 22 does not include the AC power supply 40 and the light control device 10 as constituent requirements.

  The filter circuit 32 is configured to remove normal mode noise and common mode noise. The filter circuit 32 includes, for example, a fourth capacitor C4 and two inductors L2 and L3. In the following, for convenience of explanation, the inductor L2 of the two inductors L2 and L3 may be referred to as a “second inductor L2”, and the inductor L3 may be referred to as a “third inductor L3”.

  The fourth capacitor C4 is electrically connected between the pair of terminals 42A and 42B. The first end of the second inductor L2 is electrically connected to the first input terminal 42A. The second end of the second inductor L2 is electrically connected to the first rectifier circuit 33. The first end of the third inductor L3 is electrically connected to the second input terminal 42B. The second end of the third inductor L3 is electrically connected to the first rectifier circuit 33.

  The filter circuit 32 removes, for example, noise superimposed on the power supply line of the AC power supply 40, noise radiated into space, and the like. The filter circuit 32 includes the fourth capacitor C4 and the two inductors L2 and L3, but this configuration is not particularly limited.

  The first rectifier circuit 33 is configured to full-wave rectify the AC voltage of the AC power supply 40. In other words, the first rectifier circuit 33 is configured to full-wave rectify the phase control voltage from the dimmer 10. The first rectifier circuit 33 is, for example, a diode bridge.

  One input end of the pair of input ends in the diode bridge is electrically connected to the second end of the second inductor L2. The other input end of the pair of input ends in the diode bridge is electrically connected to the second end of the third inductor L3. A pair of output terminals of the diode bridge are electrically connected to the power conversion circuit 34.

  The power conversion circuit 34 is configured to convert the voltage that has been full-wave rectified by the first rectification circuit 33 into a predetermined direct current. The power conversion circuit 34 is, for example, an insulating flyback converter. The power conversion circuit 34 includes a fifth capacitor C5, a first switching element Q1, a transformer T1, a third diode D3, and a sixth capacitor C6. The first switching element Q1 is, for example, an npn type transistor. The transformer T1 includes a primary winding N1 and a secondary winding N2.

  The fifth capacitor C <b> 5 is electrically connected between a pair of output terminals of the diode bridge that is the first rectifier circuit 33.

  The first main terminal (collector terminal in this embodiment) of the first switching element Q1 is electrically connected to the high potential side terminal of the fifth capacitor C5 through the primary winding N1. The second main terminal (in this embodiment, the emitter terminal) of the first switching element Q1 is electrically connected to the low potential side terminal of the fifth capacitor C5. A control terminal (in this embodiment, a base terminal) of the first switching element Q1 is electrically connected to the control circuit 38.

  The first end of the secondary winding N2 is electrically connected to the anode of the third diode D3. The cathode of the third diode D3 is electrically connected to the high potential side terminal of the sixth capacitor C6. The terminal on the low potential side of the sixth capacitor C6 is electrically connected to the second end of the secondary winding N2. The second end of the secondary winding N2 is electrically connected to the low potential side terminal of the fifth capacitor C5.

  The power conversion circuit 34 is configured to convert the voltage that has been full-wave rectified by the first rectification circuit 33 into a predetermined direct current, but is not limited to this configuration. For example, the power conversion circuit 34 may be configured to convert a voltage that has been full-wave rectified by the first rectifier circuit 33 into a predetermined DC voltage. The first switching element Q1 is an npn transistor, but is not limited thereto. The first switching element Q1 may be an n-channel MOSFET, for example.

  The light source unit 21 can be electrically connected between both ends of the sixth capacitor C6. Thereby, in the lighting device 22, when the voltage across the sixth capacitor C6 is equal to or higher than the total forward voltage of the solid state light emitting elements 25, the light source unit 21 can be turned on.

  The control circuit 38 is configured to control the power conversion circuit 34. Specifically, the control circuit 38 is configured to control the first switching element Q1.

  The control circuit 38 is, for example, a second microcomputer on which a second program is installed. For example, the second program is stored in a second memory (not shown) provided in advance in the second microcomputer. In the lighting device 22, the second microcomputer is used as the control circuit 38, but the present invention is not limited to this. The control circuit 38 may be, for example, a second control IC.

  The second rectifier circuit 36 is configured to full-wave rectify the phase control voltage. In other words, the second rectifier circuit 36 is configured to full-wave rectify the phase control voltage from the dimmer 10. For example, the second rectifier circuit 36 includes two diodes D4 and D5. Hereinafter, for convenience of explanation, the diode D4 of the two diodes D4 and D5 may be referred to as a “fourth diode D4”, and the diode D5 may be referred to as a “fifth diode D5”.

  The anode of the fourth diode D4 is electrically connected to the second end of the second inductor L2. The cathode of the fourth diode D4 is electrically connected to the detection circuit 35. The anode of the fifth diode D5 is electrically connected to the second end of the third inductor L3. The cathode of the fifth diode D5 is electrically connected to the detection circuit 35.

  The detection circuit 35 is configured to detect the voltage that has been full-wave rectified by the second rectifier circuit 36. The detection circuit 35 is, for example, a resistance voltage dividing circuit. The resistance voltage dividing circuit is, for example, a series circuit of a first resistor and a second resistor. The first end of the first resistor is electrically connected to the cathodes of the fourth diode D4 and the fifth diode D5. The second end of the first resistor is electrically connected to the first end of the second resistor. The second end of the second resistor is electrically connected to the ground of the lighting device 22. Both the second end of the first resistor and the first end of the second resistor are electrically connected to the control circuit 38.

  The control circuit 38 includes a determination circuit 41. The determination circuit 41 is configured to receive the voltage V3 (see FIG. 4) detected by the detection circuit 35. The voltage V3 detected by the detection circuit 35 corresponds to the voltage across the second resistor. 4 represents the voltage applied between the pair of input terminals of the filter circuit 32 in the lighting device 22. V5 on the vertical axis in FIG. 4 represents the voltage across the third capacitor C3 in the rectifying and smoothing circuit 11 of the dimmer 10. In FIG. 4, t on each horizontal axis represents time. Hereinafter, for convenience of description, the voltage V3 is referred to as “detection voltage V3”.

  The determination circuit 41 is configured to receive the detection voltage V3, but is not limited to this configuration. The determination circuit 41 may be configured to receive, for example, the detection voltage V3 from which high-frequency noise has been removed. In this case, the control circuit 38 is provided with a filter (not shown) for removing high frequency noise. The filter is, for example, a digital filter. The digital filter is configured, for example, to perform a moving average calculation on a digital signal obtained by analog / digital conversion of the detection voltage V3. The moving average means a simple moving average.

  The determination circuit 41 determines when the detection voltage V3 has decreased to a preset second threshold value Vs2 (see FIG. 5) from when the detection voltage V3 has become larger than the preset first threshold value Vs1 (see FIG. 5). It is comprised so that the period until may be detected. The determination circuit 41 is configured to determine whether or not the period is the phase magnitude of the detection voltage V3. For example, the first threshold value Vs1 is set to be larger than the second threshold value Vs2. The magnitude of the phase of the detection voltage V3 corresponds to the conduction angle of the switching device 3 in the light control device 10. In other words, the magnitude of the phase of the detection voltage V <b> 3 corresponds to the dimming ratio that determines the light output of the light source unit 21. The first threshold value Vs1 and the second threshold value Vs2 are stored in the second memory, respectively. V3 on the vertical axis in FIG. 5 represents the detection voltage. T on the horizontal axis in FIG. 5 represents time. T in FIG. 5 represents one cycle of the detection voltage V3.

  The first threshold value Vs1 is set larger than the second threshold value Vs2, but is not limited thereto. For example, the first threshold value Vs1 may be set to the same size as the second threshold value Vs2.

  By the way, in the lighting device 22, for example, when noise of a magnitude that cannot be removed by the filter circuit 32 is superimposed on the power supply line of the AC power supply 40 at the time of the zero crossing of the AC voltage of the AC power supply 40, the detection circuit 35 detects the noise. There is a possibility that the magnitude of the phase of the detected voltage V3 will fluctuate.

  When the magnitude of the phase of the detection voltage V3 detected by the detection circuit 35 in the lighting device 22 varies, the inventors of the present application erroneously set the dimming ratio that determines the light output of the light source unit 21. I thought that there was a case to judge. Further, as an example in which the phase magnitude of the detection voltage V3 fluctuates, the inventors of the present application show that the phase magnitudes Ta and Tb of the detection voltage V3 fluctuate alternately to different values as shown in FIG. I got the knowledge that there is.

  As shown in FIG. 5, when the first period Tb, which is the detected period, is shorter than the second period Ta, which is the period detected before detecting the first period Tb, the determination circuit 41 It is configured to determine that the period Tb is the magnitude of the phase of the detection voltage V3.

  When the determination circuit 41 determines that the first period Tb is the magnitude of the phase of the detection voltage V3, the control circuit 38 is based on the first period Tb that is determined to be the magnitude of the phase of the detection voltage V3. Thus, the first switching element Q1 is controlled. Thereby, the lighting device 22 can suppress erroneous detection of the dimming ratio that determines the light output of the light source unit 21. Further, in the lighting device 22, it is possible to suppress flickering of light emitted from the light source unit 21 as compared with a case where the determination circuit 41 does not determine whether the period is the magnitude of the phase of the detection voltage V <b> 3. Is possible.

  The control circuit 38 is configured to output a third PWM signal. A second data table (not shown) is stored in the second memory of the second microcomputer which is the control circuit 38. The second data table is a data table in which the first period Tb determined to be the magnitude of the phase of the detection voltage V3 and the on-duty ratio of the third PWM signal are associated with each other on a one-to-one basis. The on-duty ratio of the third PWM signal corresponds to the on-period of the first switching element Q1. In other words, the on-duty ratio of the third PWM signal corresponds to the dimming ratio of the light source unit 21. The on-duty ratio of the third PWM signal is set to increase as the phase of the detection voltage V3 increases.

  Further, the control circuit 38 outputs a third PWM signal having an on-duty ratio corresponding to the first period Tb determined to be the magnitude of the phase of the detection voltage V3 based on the second data table to the first switching element. It is configured to output to Q1. Thereby, in the lighting device 22, the light source unit 21 can be dimmed.

  The determination circuit 41 is configured to determine that the first period Tb is the magnitude of the phase of the detection voltage V3 when the first period Tb is shorter than the second period Ta. However, the determination circuit 41 is not limited to this configuration. Absent.

  The determination circuit 41 may be configured to extract a plurality of sample values from the voltage V3 detected by the detection circuit 35. In addition, as shown in FIG. 6, the determination circuit 41 has a predetermined difference W1 between the first sample value S1 that is the extracted sample value and the second sample value S2 that is the previously extracted sample value. When the first sample value S1 is extracted, it is determined that the switching device 3 of the light control device 10 is switched from the cut-off state to the conductive state, and the first sample value S1 is The period Tc (see FIG. 6) from the time of extraction to the time when the detection voltage V3 becomes equal to or lower than the second threshold Vs2 may be determined to be the magnitude of the phase of the detection voltage V3. The specified value is stored in the second memory. The specified value is preferably set to a value within a range of 1 V or more and less than 2 V, for example. V3 on the vertical axis in FIG. 6 represents the detection voltage. T on the horizontal axis in FIG. 6 represents time. T in FIG. 6 represents one cycle of the detection voltage V3. The black circle in FIG. 6 represents the sample value. The time interval at which the determination circuit 41 extracts a plurality of sample values is set to several tens of μs, for example.

  The determination circuit 41 may be configured to detect a voltage value at the time when the detection voltage V3 reaches the first threshold value Vs1. Further, when the voltage value is equal to or higher than the preset third threshold value Vs3 (see FIG. 7), the determination circuit 41 conducts the switching device 3 of the dimming device 10 from the shut-off state when the first threshold value Vs1 is reached. A period Td (see FIG. 7) is determined from the time when the detection voltage V3 becomes higher than the first threshold value Vs1 to the time when the detection voltage V3 decreases to the second threshold value Vs2. The phase of the detection voltage V3 may be determined to be determined. In this case, the third threshold value Vs3 is set to be larger than, for example, the first threshold value Vs1. The third threshold value Vs3 is stored in the second memory. V3 on the vertical axis in FIG. 7 represents the detection voltage. T on the horizontal axis in FIG. 7 represents time. T in FIG. 7 represents one cycle of the detection voltage V3.

  The determination circuit 41 is configured to detect a voltage value at the time when the detection voltage V3 reaches the first threshold value Vs1, but this configuration is not particularly limited. For example, the determination circuit 41 may be configured to detect a voltage value immediately after the detection voltage V3 reaches the first threshold value Vs1. The time point immediately after the detection voltage V3 reaches the first threshold value Vs1 means, for example, a time point within several tens of μs from the time point when the detection voltage V3 reaches the first threshold value Vs1.

  The control circuit 38 includes the determination circuit 41, but is not limited thereto. For example, the determination circuit 41 may be provided separately from the control circuit 38.

  The lighting device 22 of the present embodiment described above is a lighting device 22 that lights the light source unit 21 including the solid light emitting element 25. The lighting device 22 includes a pair of terminals 42A and 42B, a first rectifier circuit 33 that performs full-wave rectification on the phase-controlled AC voltage, and a voltage that has been full-wave rectified by the first rectifier circuit 33. And a power conversion circuit 34 for converting the current to a direct current. The lighting device 22 includes a control circuit 38 that controls the power conversion circuit 34, a second rectification circuit 36 that performs full-wave rectification on the phase-controlled AC voltage, and a voltage that is full-wave rectified by the second rectification circuit 36. And a determination circuit 41. The determination circuit 41 lowers the voltage V3 detected by the detection circuit 35 to the preset second threshold Vs2 from the time when the voltage V3 detected by the detection circuit 35 becomes larger than the preset first threshold Vs1. The period up to this point is detected, and it is determined whether or not the period is the magnitude of the phase of the voltage V3 detected by the detection circuit 35. The first rectifier circuit 33 and the second rectifier circuit 36 are configured to apply the phase-controlled AC voltage to a full wave when a series circuit of the AC power supply 40 and the dimmer 10 is connected between the pair of terminals 42A and 42B. It is configured to rectify. The power conversion circuit 34 includes a switching element (first switching element) Q1. When the determination circuit 41 determines that the period is the phase magnitude, the control circuit 38 controls the switching element Q1 based on the period determined to be the phase magnitude. Thereby, in the lighting device 22, it becomes possible to suppress erroneous detection of the dimming ratio that determines the light output of the light source unit 21.

  The lighting device 22 preferably further includes a filter circuit 32 connected between the pair of terminals 42A and 42B. The filter circuit 32 is preferably provided on the input side of each of the first rectifier circuit 33 and the second rectifier circuit 36. Thereby, in the lighting device 22, it becomes possible to suppress generation | occurrence | production of noise. Therefore, the lighting device 22 can further suppress erroneous detection of the dimming ratio that determines the light output of the light source unit 21.

  The determination circuit 41 determines that the first period Tb is the magnitude of the phase when the first period Tb that is the detected period is shorter than the second period Ta that is the previously detected period. Is preferred. Thereby, even in the lighting device 22, it is possible to suppress erroneous detection of the light control ratio that determines the light output of the light source unit 21.

  The determination circuit 41 is preferably configured to extract a plurality of sample values from the voltage V3 detected by the detection circuit 35. Further, when the difference W1 between the first sample value S1, which is the extracted sample value, and the second sample value S2, which is the previously extracted sample value, is greater than or equal to a predetermined value, It is determined that the time point when the first sample value S1 is extracted is the time point when the switching device 3 provided in the dimming device 10 is changed from the cutoff state to the conductive state, and the first sample value S1 is extracted. It is preferable to determine that the period Tc from the time point to the time point when the voltage detected by the detection circuit 35 becomes equal to or lower than the second threshold value Vs2 is the magnitude of the phase. Thereby, even in the lighting device 22, it is possible to suppress erroneous detection of the light control ratio that determines the light output of the light source unit 21.

  The determination circuit 41 is preferably configured to detect a voltage value when the voltage V3 detected by the detection circuit 35 reaches the first threshold value Vs1. In addition, when the voltage value is greater than or equal to the third threshold value Vs3 that is greater than the first threshold value Vs1, the determination circuit 41 shuts off the switching device 3 provided in advance in the dimming device 10 when the voltage reaches the first threshold value Vs1. It is preferable to determine that it is the time when the state is changed to the conductive state. Further, the determination circuit 41 has a period Td from the time when the voltage V3 detected by the detection circuit 35 becomes larger than the first threshold value Vs1 to the time when the voltage V3 detected by the detection circuit 35 falls to the second threshold value Vs2. Is preferably determined to be the magnitude of the phase. Thereby, even in the lighting device 22, it is possible to suppress erroneous detection of the light control ratio that determines the light output of the light source unit 21.

  Hereinafter, the lighting fixture 20 of this embodiment is demonstrated based on FIG.

  The lighting fixture 20 is configured to be directly attached to the ceiling material 50, for example. The lighting fixture 20 includes a light source unit 21, a lighting device 22, a fixture body 23, and a diffusion unit 24. 1-3, illustration of the instrument main body 23 and the spreading | diffusion part 24 is abbreviate | omitted.

  The light source unit 21 includes a plurality of solid state light emitting elements 25 and a substrate 26. The board | substrate 26 is a printed circuit board, for example. A plurality of solid state light emitting elements 25 are electrically mounted on the first surface (the lower surface in FIG. 8) of the substrate 26. The plurality of solid state light emitting elements 25 are arranged at equal intervals on the circumference of the virtual circle in the first surface of the substrate 26.

  The lighting device 22 is electrically connected to the substrate 26 via, for example, a pair of first connection lines (not shown). The lighting device 22 is configured to electrically connect a pair of second connection lines 27A and 27B, for example. The pair of second connection lines 27 </ b> A and 27 </ b> B are, for example, a pair of electric wires led out from a first hole 51 provided in the ceiling member 50 in advance.

  For example, an AC power supply 40 (see FIG. 3) can be electrically connected to the lighting device 22 via the second connection line 27A. Moreover, the light control apparatus 10 (refer FIG. 3) can be electrically connected to the lighting device 22 via the 2nd connection line 27B, for example.

  The instrument body 23 is configured such that each of the light source unit 21 and the lighting device 22 is attached. The instrument main body 23 includes a main body portion 28 and a flange portion 29. The material of the instrument body 23 is, for example, a metal. Examples of the metal include aluminum, stainless steel, and iron.

  The main body 28 is formed in a bottomed cylindrical shape, for example. The bottom wall of the main body 28 is formed with a second hole (not shown) for passing the pair of second connection lines 27A and 27B. The flange portion 29 is configured to protrude outward from an end portion on the opening side (lower side in FIG. 8) in the side wall of the main body portion 28. Further, the flange portion 29 is configured integrally with the main body portion 28. In addition, although the main-body part 28 is formed in the bottomed cylindrical shape, it is not restricted to this shape. The main body 28 may be formed in a bottomed rectangular tube shape, for example.

  Although the instrument main body 23 is comprised so that each of the light source part 21 and the lighting device 22 may be attached, it is not restricted to this. The instrument body 23 may be configured such that only the light source unit 21 is attached, for example. In this case, the lighting device 22 is preferably installed on the first surface side (the upper surface side in FIG. 8) of the ceiling material 50. Thereby, in the lighting fixture 20, it becomes possible to suppress that the heat which generate | occur | produces in the lighting device 22 is conducted to the light source part 21, and it becomes possible to suppress deterioration of the light source part 21. Moreover, in the lighting fixture 20, it becomes possible to suppress that the heat which generate | occur | produces in the light source part 21 is conducted to the lighting device 22, and it becomes possible to suppress degradation of the several electronic component which comprises the lighting device 22. .

  The diffusion unit 24 is configured to diffuse the light emitted from each solid state light emitting element 25. Further, the diffusing portion 24 is configured to be attached to the flange portion 29 of the instrument main body 23. The material of the diffusion part 24 is, for example, a translucent material. Examples of the translucent material include acrylic resin and glass.

  Moreover, the lighting fixture 20 is provided with the bleeder circuit 31 (refer FIGS. 1-3). As shown in FIG. 3, the bleeder circuit 31 is electrically connected in parallel to an illumination load 19 including a light source unit 21 and a lighting device 22. In FIG. 8, the bleeder circuit 31 is not shown.

  As shown in FIG. 2, the bleeder circuit 31 includes a second switching element Q2, a series circuit of a plurality (two in this embodiment) of resistors R1 and R2, and a Zener diode ZD1.

  The second switching element Q2 is, for example, a normally-off type n-channel MOSFET. The first main terminal (in this embodiment, the drain terminal) of the second switching element Q2 is electrically connected to the cathodes of the fourth diode D4 and the fifth diode D5. The second main terminal (in this embodiment, the source terminal) of the second switching element Q2 is electrically connected to the first end of the resistor R1. The second end of the resistor R1 is electrically connected to the first end of the resistor R2. The second end of the resistor R <b> 2 is electrically connected to the first output end of the pair of output ends in the diode bridge that is the first rectifier circuit 33. A control terminal (in this embodiment, a gate terminal) of the second switching element Q2 is electrically connected to the control circuit 38.

  The anode of the Zener diode ZD1 is electrically connected to the second end of the resistor R2. The cathode of the Zener diode ZD1 is electrically connected to the gate terminal of the second switching element Q2.

  The bleeder circuit 31 has a current (hereinafter referred to as “bleeder current”) Ib flowing from the AC power supply 40 when the switching device 3 in the dimming device 10 is in the cut-off state, and the bleeder current Ib 5 is configured to output to 5. More specifically, the control circuit 38 is configured to turn on the second switching element Q2 when the switching device 3 is in the cut-off state. Accordingly, the bleeder circuit 31 can output the bleeder current Ib to the third capacitor C3 via the second diode D2 in the dimming device 10 when the switching device 3 is in the cut-off state. In other words, the bleeder circuit 31 can output the bleeder current Ib to the power supply circuit 5 of the dimming device 10 when the switching device 3 is in the cut-off state.

  By the way, in the illumination system 30, when the switching device 3 is in the cut-off state, the inventors of the present application, since the bleeder current Ib flows from the AC power supply 40 to the power supply circuit 5 of the dimming device 10 through the bleeder circuit 31. The knowledge that the voltage V5 across the capacitor C3 increases was obtained (see FIG. 4). Therefore, in the lighting system 30, the third capacitor C <b> 3 in the dimming device 10 can be charged when the switching device 3 is in the cutoff state, and the first DC voltage V <b> 1 supplied from the power supply circuit 5 to the control circuit 4. Can be stabilized. Therefore, in the illumination system 30, the operation of the control circuit 4 can be stabilized.

  Further, the inventors of the present application change the magnitude of the phase of the detection voltage V3 detected by the detection circuit 35 of the lighting device 22 when the bleeder current Ib flows through the bleeder circuit 31 of the lighting fixture 20 in the lighting system 30. It was found that there is a possibility (see FIG. 4 and FIG. 5). More specifically, when the bleeder current Ib flows through the bleeder circuit 31 of the lighting fixture 20 and the conduction angle of the switching device 3 of the light control device 10 is small in the lighting system 30, the inventors of the present application detect the detection voltage V3. It has been found that the rising edge of C may periodically be significantly distorted (see FIGS. 4 and 5). In addition, in the lighting device 22, when the conduction angle of the switching device 3 is small, the inventors of the present application noticeably flickering of light emitted from the light source unit 21 when the magnitude of the phase of the detection voltage V3 varies. I thought.

  As described above, the determination circuit 41 determines that the first period Tb, which is the detected period, is shorter than the second period Ta, which is the period detected before detecting the first period Tb. It is determined that the period Tb is the magnitude of the phase of the detection voltage V3. Thereby, the lighting device 22 can suppress erroneous detection of the dimming ratio that determines the light output of the light source unit 21. Therefore, in the lighting device 22, it is possible to suppress the light emitted from the light source unit 21 from flickering when the conduction angle of the switching device 3 is small.

  The control circuit 38 in the lighting device 22 is configured to turn off the second switching element Q2 when the switching device 3 is in a conductive state. As a result, the lighting fixture 20 can supply the lighting device 22 with the power necessary for lighting the light source unit 21 and operating the control circuit 38. Moreover, since the 2nd switching element Q2 in the bleeder circuit 31 will be in an OFF state, it becomes possible for the lighting fixture 20 to suppress the power loss in the bleeder circuit 31.

  The lighting fixture 20 includes a unit (not shown) in which a module substrate (not shown) having a bleeder circuit 31 is accommodated. The module substrate means a substrate on which a plurality of electronic components constituting the bleeder circuit 31 are electrically mounted.

  The unit may be configured to be attached to the instrument body 23, or may be configured to be installed on the first surface side (the upper surface side in FIG. 8) of the ceiling material 50.

  In addition, although the lighting fixture 20 is provided with the bleeder circuit 31, this is not specifically limited, The bleeder circuit 31 does not need to be provided.

  The lighting fixture 20 of this embodiment demonstrated above is provided with the light source part 21, the lighting device 22 which lights the light source part 21, and the fixture main body 23 to which the light source part 21 is attached. Thereby, in the lighting fixture 20, the lighting fixture 20 provided with the lighting device 22 which can suppress the misdetection of the light control ratio which determines the light output of the light source part 21 can be provided.

  It is preferable that the lighting fixture 20 further includes a bleeder circuit 31 connected in parallel to the lighting load 19 including the light source unit 21 and the lighting device 22. Thereby, in the lighting fixture 20, when the series circuit of AC power supply 40 and the light control apparatus 10 is electrically connected, and the switching apparatus 3 is a interruption | blocking state, the electric current Ib from AC power supply 40 is light control apparatus. 10 can be bypassed.

DESCRIPTION OF SYMBOLS 19 Lighting load 20 Lighting fixture 21 Light source part 22 Lighting device 23 Appliance main body 25 Solid light emitting element 31 Breeder circuit 32 Filter circuit 33 1st rectifier circuit 34 Power conversion circuit 35 Detection circuit 36 2nd rectifier circuit 38 Control circuit 41 Determination circuit 42A, 42B A pair of terminals Q1 1st switching element (switching element)

Claims (7)

A lighting device for lighting a light source unit including a solid state light emitting element,
A pair of terminals to which a series circuit of a dimming device having a switching device and an AC power supply is connected, a first rectifier circuit for full-wave rectification of a phase-controlled AC voltage, and a full-wave by the first rectifier circuit A power conversion circuit that converts the rectified voltage into a predetermined DC voltage or a predetermined DC current; a control circuit that controls the power conversion circuit; and a second rectification circuit that performs full-wave rectification of the phase-controlled AC voltage; A detection circuit that detects a voltage that is full-wave rectified by the second rectification circuit, and a determination circuit.
The determination circuit includes:
Detecting a period from a time point when the voltage detected by the detection circuit becomes larger than a preset first threshold value to a time point when the voltage detected by the detection circuit is lowered to a preset second threshold value; And,
It is configured to determine whether or not the period is a conduction period in which the switching device is in a conduction state in a half cycle of the AC voltage of the AC power source ,
The first rectifier circuit and the second rectifier circuit, when the series circuit between the AC power source and the dimmer is connected between the pair of terminals, a full-wave rectifying the phase controlled AC voltage Configured to
The power conversion circuit includes a switching element,
The control circuit controls the switching element based on the period determined to be the conduction period when the determination circuit determines that the period is the conduction period. apparatus. A filter circuit connected between the pair of terminals,
The lighting device according to claim 1, wherein the filter circuit is provided on an input side of each of the first rectifier circuit and the second rectifier circuit. The determination circuit determines that the first period is the conduction period when the first period that is the detected period is shorter than the second period that is the previously detected period. The lighting device according to claim 1 or 2. The determination circuit is configured to extract a plurality of sample values from the voltage detected by the detection circuit;
The determination circuit includes:
When the difference between the first sample value that is the extracted sample value and the second sample value that is the previously extracted sample value is equal to or greater than a predetermined value, the time when the first sample value is extracted Is determined to be a point in time when the switching device provided in advance in the dimming device is switched from the cut-off state to the conductive state, and
Claim 1 period until the time when the voltage detected by the detection circuit from the time when the first sample value is extracted is equal to or less than the second threshold value, characterized in that determining said a conduction period Or the lighting device of Claim 2. The determination circuit is configured to detect a voltage value at a time when the voltage detected by the detection circuit reaches the first threshold value,
The determination circuit includes:
When the voltage value is greater than or equal to a third threshold value that is greater than the first threshold value, the time point when the first threshold value is reached is the time point when the switching device provided in advance in the light control device is changed from a cutoff state to a conductive state. It is determined that there is, and
Period until the time when the voltage detected by the detection circuit from the time when the voltage detected by the detecting circuit is larger than the first threshold value decreases to the second threshold value, determines that the a conduction period The lighting device according to claim 1 or claim 2, wherein An illumination fixture comprising: the light source unit; the lighting device according to any one of claims 1 to 5 for lighting the light source unit; and a fixture main body to which the light source unit is attached. . The luminaire according to claim 6, further comprising a bleeder circuit connected in parallel to an illumination load including the light source unit and the lighting device.

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