JP2020167057A - Lighting device and lighting fixture - Google Patents

Abstract

To provide a lighting device and a lighting fixture capable of suppressing heat generation in a resistor and increase in power consumption in the state where no light source module is attached.SOLUTION: Provided is a lighting device including: a connection unit for removably connecting a light source module having a light source; a power supply unit capable of outputting DC power applicable to the light source module; a control unit for controlling the output of the DC power by the power supply unit; and a detection circuit for detecting the connection of the light source module to the connection unit. The light source module includes a first resistor connected in series to the light source. The control unit includes a connecting terminal electrically connected to the first resistor via the connection unit when the light source module is connected to the connection unit. The detection circuit includes a second resistor connected to the connecting terminal so as to be in parallel with the first resistor of the light source module connected to the connection unit. A resistance value of the second resistor is greater than a resistance value of the first resistor.SELECTED DRAWING: Figure 1

Description

Embodiments of the present invention relate to lighting devices and luminaires.

A lighting fixture including a light source module having a light source such as an LED and a lighting device for supplying electric power to the light source module to light the light source is known.

If the lighting device outputs the light source module without being mounted, it may cause a failure. Therefore, in the lighting device, in order to suppress the output in the state where the light source module is not mounted, the mounting of the light source module is detected.

Further, in the lighting device, a substantially constant current flows through the light source by detecting the current flowing through the light source and performing feedback control.

The mounting detection of the light source module is performed by, for example, a resistor connected in parallel with the light source. The current detection of the light source is performed by, for example, a resistor connected in series with the light source. In this way, in the configuration in which the resistor for mounting detection and the resistor for current detection are provided separately, the circuit scale becomes large, for example, a larger board mounting area must be secured. Therefore, it has been proposed that a resistor connected in series with the light source can be used for both the detection of mounting the light source module and the detection of the current of the light source.

When detecting with a resistor connected in series with the light source, it is necessary to set the resistor to a low resistance of about several Ω in order to suppress the power consumption at the time of lighting. Therefore, when the detection is performed without the light source module mounted, the current flowing through the resistor becomes large, and the resistor may generate heat. Further, if the power margin of the resistor is increased in order to suppress a failure due to heat generation, the power consumption will increase.

For this reason, in the lighting device and the luminaire, a resistor is also used so that the light source module can be detected and the current flowing through the light source can be detected with a simple configuration, but the light source module is not installed. It is desired to be able to suppress the heat generation of the resistor and the increase in power consumption in the above.

Japanese Unexamined Patent Publication No. 2012-28222

In the embodiment of the present invention, the resistor is also used to enable the detection of the mounting of the light source module and the detection of the current flowing through the light source with a simple configuration, and the resistance in the state where the light source module is not mounted. Provided are a lighting device and a lighting fixture capable of suppressing heat generation and an increase in power consumption of the vessel.

According to the embodiment of the present invention, a connection unit for detachably connecting a light source module having a light source, a power supply unit capable of outputting DC power corresponding to the light source module, and the DC by the power supply unit. The light source module includes a control unit for controlling the output of electric power and a detection circuit for detecting the connection of the light source module to the connection unit, and the light source module has a first resistor connected in series with the light source. The detection circuit has, when the light source module is connected to the connection part, is electrically connected to the first resistor via the connection part, and is for detecting the connection of the light source module. A detection voltage is applied to the first resistor, and the control unit is electrically connected to the first resistor via the connection portion when the light source module is connected to the connection portion. It has terminals, and the detection circuit detects the connection of the light source module to the connection portion based on the voltage value of the connection terminal when the detection voltage is applied to the first resistor, and supplies the power. The unit detects the current value of the current flowing through the light source based on the voltage value of the connection terminal when the DC power is output to the light source module, and a constant current flows through the light source based on the detected current value. As described above, the operation of the power supply unit is feedback-controlled, and the detection circuit is connected to the connection terminal so as to be parallel to the first resistor of the light source module connected to the connection unit. A lighting device having a device and having a resistance value of the second resistor larger than the resistance value of the first resistor is provided.

By making it possible to detect the installation of the light source module and the current flowing through the light source with a simple configuration by also using the resistor, the heat generation and power consumption of the resistor when the light source module is not installed can be detected. Lighting devices and luminaires that can suppress the increase are provided.

It is a block diagram which shows typically the lighting device and the luminaire which concerns on embodiment. It is a circuit diagram which shows an example of a detection circuit schematically. It is explanatory drawing which shows an example of the operation of a control part schematically. It is explanatory drawing which shows an example of the operation of a control part schematically. It is a graph which shows an example of the current flowing through a light source and the winding current of a power supply part schematically. 6 (a) and 6 (b) are graphs schematically showing an example of the operation of the control unit.

Hereinafter, each embodiment will be described with reference to the drawings.
The drawings are schematic or conceptual, and the relationship between the thickness and width of each part, the ratio of the sizes between the parts, and the like are not necessarily the same as the actual ones. Further, even when the same parts are represented, the dimensions and ratios may be different from each other depending on the drawings.
In the specification of the present application and each of the drawings, the same elements as those described above with respect to the above-described drawings are designated by the same reference numerals, and detailed description thereof will be omitted as appropriate.

FIG. 1 is a block diagram schematically showing a lighting device and a lighting fixture according to an embodiment.
As shown in FIG. 1, the luminaire 2 includes a lighting device 10 and a light source module 100. The lighting device 10 includes a control unit 12, a connection unit 14, a power supply unit 16, and a detection circuit 18.

The lighting device 10 is electrically connected to, for example, the power supply PS. AC power is supplied to the lighting device 10 from, for example, the power supply PS. The power source PS is, for example, a commercial power source. The AC voltage of the AC power supplied from the power source PS is, for example, 100V to 242V (effective value). The power source PS may be, for example, a private power generator. The power supplied to the lighting device 10 is not limited to AC power, but may be DC power or the like. In the following, a case where AC power is supplied to the lighting device 10 will be described as an example.

The lighting device 10 is electrically connected to the light source module 100. The lighting device 10 converts the AC power supplied from the power supply PS into DC power corresponding to the light source module 100 and supplies the AC power to the light source module 100. As a result, the lighting device 10 lights the light source module 100.

The connecting portion 14 is used for electrical connection with the light source module 100. The connecting portion 14 is detachably connected to the light source module 100. One of a plurality of types of light source modules 100 having different color temperature, brightness, and the like is selectively connected to the connection portion 14. The connection unit 14 enables any of a plurality of types of light source modules 100 to be detachably connected.

The light source module 100 includes, for example, a light source 102 and a connected portion 104. The light source module 100 includes, for example, a plurality of light sources 102. In this example, each light source 102 is connected in series. Each light source 102 may be connected in parallel, for example, or a series connection and a parallel connection may be combined. The number of light sources 102 may be arbitrary. The number of light sources 102 may be, for example, one.

For the light source 102, for example, a light emitting diode (LED) is used. The light source 102 may be, for example, an organic light emitting diode (OLED), an inorganic electroluminescent element, an organic electroluminescent element, or another electroluminescent element. Good. The light source 102 may be, for example, a light bulb. Hereinafter, the light source 102 will be described as an LED.

Further, the light source module 100 further includes a resistor 106 (first resistor). The resistor 106 is connected in series with the light source 102. The resistor 106 is connected in series to each of the plurality of light sources 102, for example. One end of the resistor 106 is electrically connected to a terminal (cathode) on the low potential side of the light source 102. The resistance value of the resistor 106 differs depending on the type of the light source module 100. The resistance value of the resistor 106 is set to, for example, about 0Ω to several Ω. However, the resistance value of the resistor 106 is not limited to this, and may be any value.

The connected portion 104 is electrically connected to the connecting portion 14 of the lighting device 10. The connected portion 104 is detachably connected to the connecting portion 14. Further, the connected portion 104 is mechanically attached to the connecting portion 14, for example, and is held by the connecting portion 14 in a state of being connected to the connecting portion 14.

The connected portion 104 has a first connected terminal 104a, a second connected terminal 104b, and a third connected terminal 104c. The first connected terminal 104a is electrically connected to the terminal (anode) on the high potential side of the light source 102. The second connected terminal 104b is electrically connected to the connection point between the light source 102 and the resistor 106. The third connected terminal 104c is electrically connected to the other end of the resistor 106 (the terminal on the side opposite to one end connected to the light source 102).

The power supply unit 16 is electrically connected to the connection unit 14. The power supply unit 16 outputs DC power corresponding to the light source module 100. The power supply unit 16 outputs, for example, a plurality of DC powers corresponding to a plurality of types of light source modules 100. In other words, the power supply unit 16 changes at least one of the voltage value and the current value of the DC power according to the type of the light source module 100.

The detection circuit 18 detects the connection of the light source module 100 to the connection unit 14. When the light source module 100 is connected to the connection portion 14, the detection circuit 18 is electrically connected to the resistor 106 via the connection portion 14 and resists the detection voltage Vdet for detecting the connection of the light source module 100. It is applied to the vessel 106.

The detection circuit 18 has, for example, a detection state and a hibernation state. The detection state is a state in which a detection voltage Vdet is applied to the resistor 106 to enable detection of the connection of the light source module 100. The hibernation state is a state in which the application of the detection voltage Vdet to the resistor 106 is stopped and the detection of the connection of the light source module 100 is suspended.

The control unit 12 has a connection terminal 12a that is electrically connected to the resistor 106 via the connection unit 14 when the light source module 100 is connected to the connection unit 14. The voltage value of the connection terminal 12a changes depending on whether or not the light source module 100 (resistor 106) is connected to the connection portion 14. The control unit 12 detects the connection of the light source module 100 to the connection unit 14 based on the voltage value of the connection terminal 12a when the detection circuit 18 applies the detection voltage Vdet to the resistor 106.

Further, the voltage value of the connection terminal 12a also changes depending on the type of the light source module 100 (resistance value of the resistor 106) connected to the connection portion 14. Therefore, the control unit 12 identifies the type of the light source module 100 connected to the connection unit 14 based on the voltage value of the connection terminal 12a when the detection circuit 18 applies the detection voltage Vdet to the resistor 106. The DC power corresponding to the identified product type is output to the power supply unit 16. As a result, the light source module 100 can be turned on at an appropriate color temperature and brightness corresponding to the product type.

Further, the control unit 12 detects the current value of the current C1 flowing through the light source 102 based on the voltage value of the connection terminal 12a when the power supply unit 16 outputs DC power to the light source module 100, and the detected current value. The operation of the power supply unit 16 is feedback-controlled so that a substantially constant current C1 flows through the light source 102 based on the above.

The control unit 12 includes an error amplifier circuit 20 and a reference voltage setting unit 22. The error amplifier circuit 20 obtains an error between the voltage value of the connection terminal 12a and the reference voltage Vref when the power supply unit 16 outputs DC power to the light source module 100. The error amplifier circuit 20 is, in other words, a differential amplifier circuit. The control unit 12 feedback-controls the operation of the power supply unit 16 according to the error obtained by the error amplifier circuit 20. As a result, the current C1 flowing through the light source 102 can be made substantially constant.

The reference voltage setting unit 22 is electrically connected to the connection terminal 12a. As a result, the voltage value of the connection terminal 12a is input to the reference voltage setting unit 22. The reference voltage setting unit 22 sets the reference voltage Vref based on the voltage value of the connection terminal 12a when the detection circuit 18 applies the detection voltage Vdet to the resistor 106. In other words, the reference voltage setting unit 22 changes the reference voltage Vref according to the type of the light source module 100 connected to the connection unit 14. As a result, the DC power corresponding to the product type of the light source module 100 can be output to the power supply unit 16, and the light source module 100 can be turned on at an appropriate color temperature and brightness corresponding to the product type.

The detection circuit 18 is electrically connected to the control unit 12. The detection circuit 18 switches between a detection state and a hibernation state based on the control of the control unit 12. The control unit 12 controls switching between the detection state and the hibernation state by the detection circuit 18, and sets the detection circuit 18 in the detection state to detect the mounting of the light source module 100 by the voltage value and the light source module 100 as described above. Identify the varieties of. Further, when the power supply unit 16 is operated, the control unit 12 puts the detection circuit 18 into a hibernation state. When the control unit 12 detects the current value of the current C1 flowing through the light source 102 based on the voltage value of the connection terminal 12a when the power supply unit 16 outputs DC power to the light source module 100, the detection circuit 18 To hibernate.

The lighting device 10 further includes, for example, a filter circuit 30, a rectifier circuit 32, an inrush prevention circuit 34, a power factor improving circuit 36, a smoothing capacitor 38, a control power supply circuit 40, a step-down circuit 42, and drive circuits 44 and 46. .. Each of these parts is provided in the lighting device 10 as needed and can be omitted.

The filter circuit 30 is electrically connected to the power supply PS. The filter circuit 30 suppresses noise included in the AC power supplied from the power supply PS, for example.

The rectifier circuit 32 is electrically connected to the filter circuit 30. The rectifier circuit 32 rectifies the AC voltage input via the filter circuit 30 and converts it into a rectified voltage. For the rectifier circuit 32, for example, a diode bridge in which four rectifier elements are combined is used. That is, the rectifier circuit 32 is a full-wave rectifier. The rectified voltage is, for example, a pulsating voltage.

The rectifier circuit 32 has a pair of input terminals 32a and 32b, a high potential output terminal 32c, and a low potential output terminal 32d. The input terminals 32a and 32b are electrically connected to the filter circuit 30. The rectifier circuit 32 converts the AC voltage input via the input terminals 32a and 32b into a rectifier voltage, and outputs the AC voltage from the high potential output terminal 32c and the low potential output terminal 32d. The potential of the low potential output terminal 32d is set to a reference potential (for example, a ground potential). The potential of the high potential output terminal 32c is set to a higher potential than the potential of the low potential output terminal 32d.

The rectifier circuit 32 may be a half-wave rectifier or the like. The rectified voltage may be a full-wave rectified pulsating current or a half-wave rectified pulsating current. For the rectifier circuit 32, for example, a Schottky barrier diode is used. Thereby, for example, good responsiveness can be obtained.

The inrush prevention circuit 34 is electrically connected to the high potential output terminal 32c. The inrush prevention circuit 34 suppresses the inrush current generated when the power is turned on.

The power factor improving circuit 36 is connected between the output of the inrush prevention circuit 34 and the low potential output terminal 32d. The power factor improving circuit 36 suppresses the generation of harmonics that are integral multiples of the power supply frequency in the rectified voltage. As a result, the power factor improving circuit 36 improves the power factor of the rectified voltage.

The power factor improving circuit 36 includes, for example, a switching element 51, an inductor 52, and a diode 53. The switching element 51 has electrodes 51a to 51c. One end of the inductor 52 is electrically connected to the output (high potential output terminal 32c) of the inrush prevention circuit 34. The other end of the inductor 52 is electrically connected to the electrode 51a. The electrode 51b is electrically connected to the low potential output terminal 32d. The anode of the diode 53 is electrically connected to the electrode 51a. The cathode of the diode 53 is electrically connected to one end of the smoothing capacitor 38. The other end of the smoothing capacitor 38 is electrically connected to the low potential output terminal 32d.

That is, in this example, the power factor improving circuit 36 is a boost chopper circuit. The power factor improving circuit 36 converts, for example, the AC voltage of the power supply PS of 100V to 242V (effective value) into the DC voltage of 420V. The power factor improving circuit 36 is not limited to this, and may be any circuit capable of improving the power factor of the rectified voltage.

The electrode 51c is electrically connected to the drive circuit 44. The electrode 51c is a so-called control electrode. The switching element 51 switches according to a signal from the drive circuit 44. The power factor improving circuit 36 improves the power factor by, for example, switching the switching element 51 and bringing the input current closer to the odd waveform of a sine wave.

The switching element 51 is, for example, an n-channel type FET. For example, the electrode 51a is a drain, the electrode 51b is a source, and the electrode 51c is a gate. The switching element 51 may be, for example, a p-channel type FET, a bipolar transistor, or the like.

The smoothing capacitor 38 converts the pulsating voltage into a DC voltage by smoothing the pulsating voltage after the power factor is improved.

The control power supply circuit 40 is electrically connected to, for example, one end of the smoothing capacitor 38 on the high potential side. As a result, the DC voltage smoothed by the smoothing capacitor 38 is input to the control power supply circuit 40. The control power supply circuit 40 converts the DC voltage smoothed by the smoothing capacitor 38 into the drive voltage of the drive circuits 44 and 46 and supplies the DC voltage to the drive circuits 44 and 46. The drive circuits 44 and 46 are driven according to the power supply from the control power supply circuit 40.

The step-down circuit 42 is electrically connected to the control power supply circuit 40. The step-down circuit 42, for example, steps down the drive voltage for the drive circuits 44 and 46 generated by the control power supply circuit 40 to the drive voltage for the control unit 12, and supplies the drive voltage after the step-down to the control unit 12. .. The control unit 12 is driven according to the power supply from the step-down circuit 42.

The power supply unit 16 has a first input terminal 16a, a second input terminal 16b, a first output terminal 16c, and a second output terminal 16d. The first input terminal 16a is electrically connected to one end of the smoothing capacitor 38 on the high potential side. The second input terminal 16b is electrically connected to the low potential output terminal 32d. As a result, a DC voltage is supplied to the power supply unit 16.

The power supply unit 16 converts the DC input power into a plurality of DC powers corresponding to the light source modules 100 of a plurality of types. Then, the power supply unit 16 supplies the converted DC power from the first output terminal 16c and the second output terminal 16d to the light source module 100.

The input power input to the power supply unit 16 may be pulsating power or AC power. For example, when the input power is AC, the power supply unit 16 may include a rectifier that rectifies the input power, a smoothing capacitor that smoothes the rectified power, and the like.

The power supply unit 16 includes, for example, a switching element 55, a diode 56, an inductor 57, and an output capacitor 58. The switching element 55 has electrodes 55a to 55c. The electrode 55a is electrically connected to the first input terminal 16a. The electrode 55b is electrically connected to the cathode of the diode 56. The anode of the diode 56 is electrically connected to the low potential output terminal 32d. One end of the inductor 57 is electrically connected to the electrode 55b. The other end of the inductor 57 is electrically connected to the first output terminal 16c. The second output terminal 16d is electrically connected to the low potential output terminal 32d (second input terminal 16b).

The output capacitor 58 has a first electrode 58a and a second electrode 58b. The first electrode 58a is electrically connected to the first output terminal 16c. The second electrode 58b is electrically connected to the second output terminal 16d. The output capacitor 58 is connected in parallel between the first output terminal 16c and the second output terminal 16d. The output capacitor 58 smoothes the current flowing between the electrodes 55a and 55b of the switching element 55 by switching the switching element 55. As a result, DC power is output from the first output terminal 16c and the second output terminal 16d.

In this example, the power supply unit 16 is a step-down chopper circuit. The power supply unit 16 generates a plurality of DC powers by stepping down the voltage of the input power. The power supply unit 16 converts the DC voltage of the power factor improving circuit 36 of 420V into a DC voltage of 50V to 300V. The power supply unit 16 is, for example, a constant current circuit. The power supply unit 16 outputs, for example, a substantially constant current C1 to the light source module 100.

The first output terminal 16c is an output terminal on the high potential side, and the second output terminal 16d is an output terminal on the low potential side. The potential of the first output terminal 16c is higher than the potential of the second output terminal 16d. The potential of the first electrode 58a is set higher than the potential of the second electrode 58b. The first electrode 58a is, for example, an anode, and the second electrode 58b is, for example, a cathode. On the contrary, the potential of the second output terminal 16d may be higher than the potential of the first output terminal 16c.

The switching element 55 is, for example, an n-channel type FET. For example, the electrode 55a is a drain, the electrode 55b is a source, and the electrode 55c is a gate. The switching element 55 may be, for example, a p-channel type FET, a bipolar transistor, or the like.

The power supply unit 16 is not limited to the above circuit, and may be any circuit capable of outputting a plurality of DC powers corresponding to a plurality of types of the light source module 100.

The drive circuit 44 is electrically connected to the control unit 12 and the electrode 51c of the switching element 51. The electrode 51c is a so-called control electrode. The drive circuit 44 controls the switching of the switching element 51 based on the control of the control unit 12. That is, the drive circuit 44 switches the switching element 51 on and off. The drive circuit 44 switches the switching element 51 on and off according to the voltage (control signal) input to the electrode 51c. The drive circuit 44 improves the power factor of the rectified voltage in the power factor improving circuit 36 by switching the switching element 51, for example.

The drive circuit 46 is electrically connected to the control unit 12 and the electrode 55c of the switching element 55. The electrode 55c is a so-called control electrode. The drive circuit 46 controls the switching of the switching element 55 based on the control of the control unit 12. That is, the drive circuit 46 switches the switching element 55 on and off. The drive circuit 46 switches the switching element 55 on and off according to the voltage (control signal) input to the electrode 55c. The drive circuit 46 generates a DC voltage between the electrodes 58a and 58b of the output capacitor 58, for example, by switching the switching element 55. As a result, DC power is supplied from the power supply unit 16 to the light source module 100.

The drive circuit 46 stops the supply of DC power from the power supply unit 16 to the light source module 100, for example, by turning off the switching element 55. Further, the drive circuit 46 changes the voltage value and the current value of the DC power according to the type of the light source module 100, for example, by changing the on / off cycle (duty ratio) of the switching element 55.

Here, the off state of the switching element 51 is, for example, a state in which a current does not substantially flow between the electrodes 51a and 51b, which are the main electrodes. In the off state, for example, a weak current that does not affect the operation of the power factor improving circuit 36 may flow between the electrodes 51a and 51b. That is, the on state of the switching element 51 is, in other words, the first state in which a current flows between the electrodes 51a and 51b, and the off state is the first state in which the current flowing between the electrodes 51a and 51b is in the first state. The second state is smaller than. The on and off states of the switching element 55 are the same as those of the on and off states of the switching element 51.

The connection portion 14 of the lighting device 10 has, for example, a first connection terminal 14a, a second connection terminal 14b, and a third connection terminal 14c. The first connection terminal 14a is electrically connected to the first output terminal 16c. The second connection terminal 14b is electrically connected to the connection terminal 12a and the detection circuit 18. The third connection terminal 14c is electrically connected to the second output terminal 16d.

Further, the first connection terminal 14a is electrically connected to the first connected terminal 104a in a state where the connecting portion 14 is connected to the connected portion 104. Similarly, in a state where the connecting portion 14 is connected to the connected portion 104, the second connecting terminal 14b is electrically connected to the second connected terminal 104b, and the third connecting terminal 14c is the third connected terminal. It is electrically connected to 104c.

As a result, the light source 102 and the resistor 106 connected in series are electrically connected to the first output terminal 16c and the second output terminal 16d of the power supply unit 16 via the connection unit 14 and the connected unit 104. .. More specifically, the terminal on the high potential side of the light source 102 is electrically connected to the first output terminal 16c via the first connection terminal 14a and the first connected terminal 104a, and the other end of the resistor 106 is the first. It is electrically connected to the second output terminal 16d via the three connection terminals 14c and the third connected terminal 104c. As a result, a direct current flows through the light source 102 and the resistor 106 according to the output of the direct current power by the power supply unit 16, and the light source 102 lights up.

The connection terminal 12a of the control unit 12 is electrically connected to the resistor 106 via the second connection terminal 14b of the connection unit 14. As a result, the voltage value of the connection terminal 12a changes according to the presence / absence of connection of the resistor 106 and the resistance value of the resistor 106.

The lighting device 10 further includes a resistor 60. The resistor 60 is electrically connected between the second output terminal 16d and the third connection terminal 14c. The resistor 60 is electrically connected between the second electrode 58b of the output capacitor 58 and the third connection terminal 14c.

The power supply unit 16 further has a detection resistor 62. The detection resistor 62 is electrically connected between the second input terminal 16b and the second electrode 58b of the output capacitor 58. In other words, the detection resistor 62 is electrically connected between the anode of the diode 56 and the second electrode 58b of the output capacitor 58. The second output terminal 16d is electrically connected to the low potential output terminal 32d via the detection resistor 62.

The control unit 12 is electrically connected to the detection resistor 62. The control unit 12 is electrically connected, for example, between the detection resistor 62 and the second electrode 58b. As a result, the detection voltage of the detection resistor 62 is input to the control unit 12. The control unit 12 detects the winding current C2 flowing through the switching element 55 and the inductor 57 based on the detection voltage of the detection resistor 62. More specifically, the winding current C2 is a current flowing between the electrodes 55a and 55b of the switching element 55. In other words, the detection resistor 62 is a resistor for detecting the unsmoothing current flowing through the switching element 55.

Further, the lighting device 10 further includes a dimming circuit 65. A dimming signal is input to the dimming circuit 65 from, for example, an external wall switch. The dimming signal may be, for example, an AC voltage whose conduction angle is controlled by a dimmer or the like. The dimming circuit 65 is electrically connected to the control unit 12. The dimming circuit 65 generates, for example, a signal representing the dimming degree based on the dimming signal, and inputs the signal to the control unit 12. The signal representing the dimming degree is, for example, a PWM signal having a duty ratio according to the dimming degree.

For example, the control unit 12 inputs the signal input from the dimming circuit 65 to the reference voltage setting unit 22. The reference voltage setting unit 22 corresponds to 100% dimming degree when, for example, the detection circuit 18 sets the reference voltage Vref based on the voltage value of the connection terminal 12a when the detection voltage Vdet is applied to the resistor 106. Set the reference voltage Vref. Then, the reference voltage setting unit 22 changes the reference voltage Vref based on the signal input from the dimming circuit 65.

The reference voltage setting unit 22 sets the reference voltage Vref corresponding to the dimming degree by, for example, multiplying the reference voltage Vref of the dimming degree by the coefficient corresponding to the dimming degree. For example, when 70% dimming is set in the dimming signal, the reference voltage setting unit 22 multiplies the reference voltage Vref of 100% dimming by 0.7 to adjust 70%. Set the reference voltage Vref corresponding to the luminous intensity.

The reference voltage setting unit 22 sets, for example, a reference voltage Vref corresponding to 100% dimming based on the voltage value of the connection terminal 12a when the detection circuit 18 applies the detection voltage Vdet to the resistor 106. The reference voltage Vref corresponding to 100% dimming is stored and held. The reference voltage setting unit 22 has a reference corresponding to 100% dimming until the connection of the light source module 100 is detected again by the detection circuit 18 in response to, for example, re-turning on the power supply or reconnection of the light source module 100. The voltage Vref is stored and held.

The control unit 12 inputs a control signal based on the error obtained by the error amplification circuit 20 to the drive circuit 46. The drive circuit 46 controls the switching of the switching element 55, for example, based on the control signal input from the control unit 12. As a result, the light source module 100 is dimmed at a dimming intensity corresponding to the dimming signal. The brightness of the light source module 100 is controlled according to the dimming signal. In this way, the control unit 12 and the drive circuit 46 change the DC power output to the light source module 100 according to the type of the light source module 100, and also change it according to the dimming signal input from the outside.

FIG. 2 is a circuit diagram schematically showing an example of a detection circuit.
As shown in FIG. 2, the detection circuit 18 includes a resistor 70, switching elements 71 and 72, and resistors 73 to 76. One end of the resistor 70 is electrically connected to the second connection terminal 14b and the connection terminal 12a.

The switching element 71 has main electrodes 71a and 71b and a control electrode 71c. The switching element 72 has main electrodes 72a and 72b and a control electrode 72c. For the switching elements 71 and 72, for example, bipolar transistors and FETs are used.

The main electrode 71a of the switching element 71 is electrically connected to the step-down circuit 42. As a result, the drive voltage generated by the step-down circuit 42 is applied to the switching element 71. The voltage applied to the switching element 71 is not limited to the drive voltage generated by the step-down circuit 42, and may be, for example, a drive voltage generated by the control power supply circuit 40. The voltage applied to the switching element 71 may be any voltage that enables detection of mounting of the light source module 100 and identification of the type of light source module 100.

The main electrode 71b of the switching element 71 is electrically connected to the other end of the resistor 70. The control electrode 71c of the switching element 71 is electrically connected to the main electrode 72a of the switching element 72 via a resistor 73. The resistor 74 is electrically connected between the main electrode 71a of the switching element 71 and the control electrode 71c.

The main electrode 72b of the switching element 72 is set to a common potential. The control electrode 72c of the switching element 72 is electrically connected to the control unit 12 via a resistor 75. The resistor 76 is electrically connected between the main electrode 72b of the switching element 72 and the control electrode 72c.

The detection circuit 18 further includes a resistor 78 (second resistor). One end of the resistor 78 is connected to the connection terminal 12a. Further, one end of the resistor 78 is connected to the second connection terminal 14b. One end of the resistor 78 is electrically connected to one end of the resistor 106 via the second connection terminal 14b and the second connected terminal 104b. In other words, one end of the resistor 78 is electrically connected to the connection point between the light source 102 and the resistor 106.

The other end of the resistor 78 is connected to one end on the opposite side of the resistor 60 from the third connection terminal 14c. The other end of the resistor 78 is electrically connected to the other end of the resistor 106 via the resistor 60, the third connection terminal 14c, and the third connected terminal 104c. The other end of the resistor 78 is set to, for example, a common potential.

In this way, the resistor 78 is connected to the connection terminal 12a so as to be in parallel with the resistor 106 and the resistor 60 of the light source module 100 connected to the connection portion 14.

The resistance value of the resistor 78 is larger than the resistance value of the resistor 106. The resistance value of the resistor 78 is, for example, 100 times or more and 2000 times or less the resistance value of the resistor 106. It is more preferable that the resistance value of the resistor 78 is, for example, 1000 times or more the resistance value of the resistor 106.

The control unit 12 controls switching between the on state and the off state of the switching element 72. When the switching element 72 is turned on, the switching element 71 is also turned on. Then, when the switching element 71 is turned on, the voltage of the step-down circuit 42 is applied to the resistor 70 as the detection voltage Vdet.

When the light source module 100 is not attached to the connection portion 14, when the detection voltage Vdet is applied to the resistor 70, the voltage value corresponding to the voltage drop in the resistor 70 is input to the connection terminal 12a. At this time, by making the resistance value of the resistor 78 larger than the resistance value of the resistor 106, it is possible to prevent the resistor 78 from affecting the detection operation. For example, by setting the resistance value of the resistor 78 to 1000 times or more the resistance value of the resistor 106, it is possible to more reliably suppress that the resistor 78 affects the detection operation.

When the light source module 100 is mounted on the connection portion 14, the resistor 70 is electrically connected to the resistor 106 and the resistor 60 of the light source module 100 via the connection portion 14 and the connected portion 104. .. The resistor 106 and the resistor 60 are connected in parallel to the resistor 70. Therefore, when the light source module 100 is mounted on the connection portion 14, when the detection voltage Vdet is applied to the resistor 70, the detection voltage Vdet applied to the resistor 70 is used as the resistance of the resistors 60, 70, 106. The voltage value divided by the value is input to the connection terminal 12a.

Therefore, the voltage value of the connection terminal 12a changes depending on the presence or absence of the connection of the light source module 100 and the resistance value of the resistor 106. The control unit 12 identifies whether or not the light source module 100 is connected and the type of the light source module 100 based on the change in the voltage value of the connection terminal 12a.

As described above, in the detection circuit 18, by turning on the switching elements 71 and 72, the detection state enables the detection of mounting of the light source module 100 and the identification of the type of the light source module 100. Then, in the detection circuit 18, by turning off the switching elements 71 and 72, the detection of the mounting of the light source module 100 and the identification of the type of the light source module 100 are suspended.

In the hibernation state, the detection voltage Vdet is not applied to the resistors 60, 70, 106. As described above, the resistance value of the resistor 106 is set to about 0Ω to several Ω. Therefore, the resistance values of the resistor 60 and the resistor 70 are also set to about several Ω. The resistance value of the resistor 78 is set to, for example, about 100Ω to 2000Ω. Therefore, a relatively large current flows through the resistors 60, 70, and 106. In particular, when the resistance value of the resistor 106 is 0Ω, a relatively large current flows through the resistor 70. Therefore, if the detection voltage Vdet is constantly applied to the resistor 70, the resistor 70 may generate heat and may cause an unnecessary increase in power consumption. By providing switching elements 71, 72 and the like so that they can be put into a hibernation state, such an increase in heat generation and power consumption can be suppressed.

The configuration of the detection circuit 18 is not limited to the above. For example, in the detection circuit 18, the detection state and the hibernation state are switched by the two switching elements 71 and 72. Not limited to this, for example, one switching element may switch between the detection state and the hibernation state, and three or more switching elements may switch between the detection state and the hibernation state. The configuration of the detection circuit 18 may be any configuration that can switch between the detection state and the hibernation state.

FIG. 3 is an explanatory diagram schematically showing an example of the operation of the control unit.
As described above, in the detection circuit 18, when the light source module 100 is not mounted, the resistor 70 is connected to the connection terminal 12a, and the voltage of the resistor 70 is input to the connection terminal 12a. Then, in the state where the light source module 100 is mounted, the resistors 60 and 106 are connected in parallel to the resistor 70, and the voltage obtained by dividing the voltage of the resistor 70 by the resistors 60 and 106 is connected to the connection terminal. Enter in 12a. In this case, the voltage value of the connection terminal 12a becomes the highest when the light source module 100 is not mounted. Then, when the light source module 100 is attached, the voltage value of the connection terminal 12a becomes lower according to the resistance value (voltage division ratio) of the resistor 106. If an appropriate voltage division ratio can be set only by the resistance value of the resistor 106, the resistor 60 may be omitted.

As shown in FIG. 3, the control unit 12 has a first threshold value Vth1 and a second threshold value Vth2 with respect to the voltage value of the connection terminal 12a. The second threshold value Vth2 is higher than the first threshold value Vth1.

When the voltage value of the connection terminal 12a is higher than the second threshold value Vth2, the control unit 12 determines that the light source module 100 is not mounted. In this case, the control unit 12 does not output the DC power from the power supply unit 16.

When the voltage value of the connection terminal 12a is in the range between the first threshold value Vth1 and the second threshold value Vth2, the control unit 12 determines that the light source module 100 suitable for the lighting device 10 is connected. In this case, the control unit 12 identifies the type of the connected light source module 100 based on the voltage value of the connection terminal 12a. For example, the control unit 12 sets a finer threshold value between the first threshold value Vth1 and the second threshold value Vth2, and identifies the type of the light source module 100 according to the range in which the voltage value of the connection terminal 12a is. .. After identifying the type of the light source module 100, the control unit 12 turns on the light source module 100 by outputting the DC power corresponding to the type to the power supply unit 16.

Then, when the voltage value of the connection terminal 12a is lower than the first threshold value Vth1, the control unit 12 determines that the light source module 100 that is not compatible with the lighting device 10 is mounted. In this case, the control unit 12 does not output the DC power from the power supply unit 16 as in the case where it is not mounted.

Contrary to the above, the detection circuit 18 may be configured so that the voltage value of the connection terminal 12a is the lowest when the light source module 100 is not mounted. In this case, when the voltage value of the connection terminal 12a is lower than the first threshold value Vth1, the control unit 12 determines that the light source module 100 is not mounted, and the voltage value of the connection terminal 12a is higher than the second threshold value Vth2. If it is high, it is determined that the light source module 100 that is not compatible with the lighting device 10 is mounted. As described above, the voltage value and the threshold value of the connection terminal 12a may be set arbitrarily so that the mounting of the light source module 100 can be detected and the type of the light source module 100 can be identified.

FIG. 4 is an explanatory diagram schematically showing an example of the operation of the control unit.
In FIG. 4, the horizontal axis is time and the vertical axis is the voltage value of the connection terminal 12a.
As shown in FIG. 4, the control unit 12 detects the mounting of the light source module 100 and the product of the light source module 100 in the state where the light source module 100 is not mounted or the light source module 100 which does not match is mounted. Identify regularly.

The state in which the light source module 100 is not mounted or the state in which the incompatible light source module 100 is mounted is, in other words, a state in which DC power is not output from the power supply unit 16. Further, detecting the mounting of the light source module 100 and identifying the type of the light source module 100 periodically means, in other words, periodically switching between the detection state and the hibernation state of the detection circuit 18.

For example, the control unit 12 detects the mounting of the light source module 100 and identifies the type of the light source module 100 in a cycle of 500 msec (for example, 200 msec or more and 800 msec or less). In other words, the control unit 12 switches the detection circuit 18 to the detection state at a cycle of 500 msec. As a result, the time required from mounting the light source module 100 to lighting the light source module 100 can be shortened.

When the time when the detection circuit 18 is in the detection state is the operating time, the time when the detection circuit 18 is in the hibernation state is the hibernation time, and the total time of the working time and the pausing time is the detection time, the control unit 12 For example, out of the detection time of 500 msec, 50 msec is set as the operating time. In this way, the control unit 12 sets the operating time to 10% or less of the detection time and the rest to the rest time, for example. As a result, it is possible to appropriately suppress heat generation in the resistor 70 and an increase in unnecessary power consumption.

FIG. 5 is a graph schematically showing an example of a current flowing through a light source and a winding current of a power supply unit.
As shown in FIG. 5, the winding current C2 flowing through the switching element 55 and the inductor 57 of the power supply unit 16 changes periodically. The winding current C2 is the current before being smoothed by the output capacitor 58. The winding current C2 increases, for example, in the on section of the switching element 55 and decreases in the off section of the switching element 55. The waveform of the winding current C2 is, for example, a triangular wave shape. The winding current C2 is a so-called pulse current. The switching period T of the switching element 55 is, for example, about 20 μs.

On the other hand, the current C1 flowing through the light source 102 is the smoothed current of the output capacitor 58, and is a substantially constant current as described above. The change in the current value of the current C1 is smaller than the change in the current value of the winding current C2.

The control unit 12 determines whether or not the winding current C2 is equal to or higher than a predetermined threshold value Is. The threshold value Is is set based on the output of the error amplifier circuit 20. As described above, the reference voltage setting unit 22 changes the reference voltage Vref set in the error amplification circuit 20 based on the signal input from the dimming circuit 65. The reference voltage setting unit 22 maximizes the reference voltage Vref at 100% dimming, and lowers the reference voltage Vref as the dimming decreases. The error amplifier circuit 20 changes the output voltage based on the error between the voltage value of the connection terminal 12a and the reference voltage Vref, and changes the output voltage level according to the reference voltage Vref. As a result, the output of the error amplifier circuit 20 also increases or decreases according to the dimming degree of the dimming signal. As a result, the threshold value Is also changes according to the dimming degree of the dimming signal. The threshold value Is decreases as the dimming degree of the dimming signal decreases.

After turning on the switching element 55, the control unit 12 turns the switching element 55 off in response to the winding current C2 becoming equal to or higher than the threshold value Is. As a result, the operation of the power supply unit 16 can be feedback-controlled so that a substantially constant current C1 flows through the light source 102, and the light source module 100 can be turned on with a brightness corresponding to the luminous intensity.

In this way, the control unit 12 controls the switching of the switching element 55 based on the current value of the current C1 flowing through the light source 102 and the current value of the winding current C2 flowing through the switching element 55, thereby substantially reducing the light source 102. The operation of the power supply unit 16 is feedback-controlled so that a constant current C1 flows, and the light source module 100 is turned on with a brightness corresponding to the dimming degree. Whether or not the winding current C2 is equal to or higher than the predetermined threshold value Is may be determined in the drive circuit 46 by inputting the voltage of the detection resistor 62 to the drive circuit 46.

6 (a) and 6 (b) are graphs schematically showing an example of the operation of the control unit.
In FIGS. 6A and 6B, the horizontal axis is time and the vertical axis is the voltage value of the connection terminal 12a.
6 (a) and 6 (b) show the voltage values of the connection terminals 12a when detecting the mounting of the light source module 100 and identifying the type of the light source module 100 when the light source module 100 is not mounted. An example is schematically shown.

Further, FIG. 6A is an example of the characteristic CT1 of the lighting device 10 in which the resistor 78 is provided in the detection circuit 18, and FIG. 6B is a reference lighting in which the resistor 78 is omitted in the detection circuit 18. This is an example of the characteristic CT2 of the device.

As shown in FIG. 6B, in the characteristic CT2 in which the resistor 78 is not provided, the voltage of the connection terminal 12a drops gradually after the application of the detection voltage Vdet to the resistor 70 is stopped.

If the resistor 78 is not provided, the connection terminal 12a (mainly the microcomputer port) becomes substantially open when the light source module 100 is removed. Therefore, in a fixed cycle during the standby for mounting of the light source module 100, for example, a capacitor and a resistor for noise reduction and voltage smoothing such as an output capacitor 58 and a resistor 70 cause the voltage to gradually drop with a certain time constant. Conceivable. In this way, when the voltage of the connection terminal 12a drops gradually, the resistor 70 or the like may generate heat. Then, if the power margin of the resistor 70 is increased in order to suppress a failure due to heat generation of the resistor 70, there is a possibility that the power consumption may increase.

On the other hand, the lighting device 10 according to the present embodiment has a resistor 78. With the light source module 100 removed, the voltage of the connection terminal 12a can be discharged to the resistor 78 having a high resistance value. For example, the voltage of the connection terminal 12a can be dropped to a common potential via the resistor 78. Therefore, as shown in FIG. 6A, the voltage of the connection terminal 12a can be lowered faster after the application of the detection voltage Vdet to the resistor 70 is stopped, as compared with the case where the resistor 78 is not provided. it can. As a result, heat generation of the resistor 70 and the like can be suppressed. The power margin of the resistor 70 and the like can be suppressed, and the increase in power consumption can also be suppressed. Therefore, by using the resistors 70 and 106 in combination, it is possible to detect the mounting of the light source module 100 and the current flowing through the light source 102 with a simple configuration, while the light source module 100 is not mounted. It is possible to provide a lighting device 10 and a lighting fixture 2 capable of suppressing heat generation and an increase in power consumption of the resistor 70 and the like.

At this time, the resistance value of the resistor 78 is made larger than the resistance value of the resistor 106. As a result, the voltage of the connection terminal 12a can be appropriately discharged while suppressing the influence on the detection operation. Further, the resistance value of the resistor 78 is set to 100 times or more, more preferably 1000 times or more, the resistance value of the resistor 106. As a result, the voltage of the connection terminal 12a can be discharged more appropriately. Then, the resistance value of the resistor 78 is set to 2000 times or less the resistance value of the resistor 106. Thereby, for example, when the detection voltage Vdet is applied to the resistor 70, it is possible to prevent a delay in the rise of the voltage of the connection terminal 12a. That is, it is possible to prevent a delay in the detection operation.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

2 ... Lighting equipment, 10 ... Lighting device, 12 ... Control unit, 14 ... Connection unit, 16 ... Power supply unit, 18 ... Detection circuit, 20 ... Error amplification circuit, 22 ... Reference voltage setting unit, 30 ... Filter circuit, 32 ... Rectifier circuit, 34 ... Rush prevention circuit, 36 ... Power factor improvement circuit, 38 ... Smoothing capacitor, 40 ... Control power supply circuit, 42 ... Step-down circuit, 44 ... Drive circuit, 46 ... Drive circuit, 51 ... Switching element, 52 ... inductor, 53 ... diode, 55 ... switching element, 56 ... diode, 57 ... inductor, 58 ... output capacitor, 60 ... resistor, 62 ... resistor, 65 ... dimming circuit, 70 ... resistor, 71 ... switching element , 72 ... switching element, 73 to 76, 78 (second resistor) ... resistor, 100 ... light source module, 102 ... light source, 104 ... connected part, 106 ... resistor (first resistor)

Claims (3)

A connection part for detachably connecting a light source module having a light source,
A power supply unit capable of outputting DC power corresponding to the light source module, and
A control unit that controls the output of the DC power by the power supply unit,
A detection circuit for detecting the connection of the light source module to the connection portion, and
With
The light source module has a first resistor connected in series with the light source.
When the light source module is connected to the connection portion, the detection circuit is electrically connected to the first resistor via the connection portion to obtain a detection voltage for detecting the connection of the light source module. Apply to the first resistor
The control unit has a connection terminal that is electrically connected to the first resistor via the connection unit when the light source module is connected to the connection unit, and the detection circuit has the detection voltage. The connection of the light source module to the connection portion was detected based on the voltage value of the connection terminal when the first resistor was applied, and the power supply unit output the DC power to the light source module. The current value of the current flowing through the light source is detected based on the voltage value of the connection terminal, and the operation of the power supply unit is feedback-controlled so that a constant current flows through the light source based on the detected current value. ,
The detection circuit has a second resistor connected to the connection terminal in parallel with the first resistor of the light source module connected to the connection portion.
A lighting device in which the resistance value of the second resistor is larger than the resistance value of the first resistor. The lighting device according to claim 1, wherein the resistance value of the second resistor is 100 times or more and 2000 times or less the resistance value of the first resistor. A light source module with a light source and
The lighting device according to claim 1 or 2,
Lighting equipment equipped with.

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