JP7443882B2 - Lighting devices and lighting equipment - Google Patents

Description

Embodiments of the present invention relate to a lighting device and a lighting fixture.

There is a lighting device that is used by being connected to a light source module having a light source such as an LED. There is a lighting fixture that includes a light source module and a lighting device. The lighting device converts AC power supplied from a commercial power source or the like into power compatible with the light source module, and supplies the converted power to the light source module to light the light source of the light source module. Further, the lighting device changes the brightness of light emitted from the light source module by changing the power supplied to the light source module according to a dimming signal input from the outside.

In such lighting equipment, a resistance is provided in the light source module in parallel with the light source, and the lighting device side detects the attachment of the light source module based on a change in voltage depending on whether the light source module is attached.

However, if a resistance for attachment detection is provided in parallel with the light source, when a low dimming level is set, a current may flow through the resistance for attachment detection, causing the light source to turn off. For this reason, in lighting devices and lighting fixtures, it is desirable to be able to suppress the light source from turning off at low dimming levels even when a resistance for attachment detection is provided in parallel with the light source.

Japanese Patent Application Publication No. 2010-205453

Embodiments of the present invention provide a lighting device and a lighting fixture that can suppress turning off of the light source at a low dimming level even when a resistance for attachment detection is provided in parallel with the light source.

According to an embodiment of the present invention, there is provided a connection portion connected to a light source module having a light source and a mounting detection resistor connected in parallel with the light source, and converting input power into power corresponding to the light source module. a power conversion section that supplies the following power to the light source module connected to the connection section; a control unit that lights up the light source module at a brightness according to the dimming level indicated by the dimming signal; a control unit that is provided between the connection unit and the power conversion unit; a detection circuit that detects only a current, and the control unit determines the slope of a change in the current supplied to the light source module with respect to the dimming level in a first region where the dimming level is less than a predetermined value. is smaller than the second region of the predetermined value or more , and the lighting device controls the operation of the power conversion unit so that a constant current flows to the light source based on the detection result of the detection circuit. .

Even when a resistance for attachment detection is provided in parallel with the light source, a lighting device and a lighting fixture are provided that can suppress turning off of the light source at a low dimming level.

FIG. 1 is a block diagram schematically representing a lighting fixture according to an embodiment. It is a graph schematically representing an example of the operation of the control unit according to the embodiment. It is a graph schematically representing an example of the operation of the control unit according to the embodiment. FIG. 3 is a block diagram schematically representing a modification of the lighting fixture according to the embodiment. FIG. 3 is a block diagram schematically representing a modification of the lighting fixture according to the embodiment. FIG. 3 is a block diagram schematically representing a modification of the lighting fixture according to the embodiment.

Each embodiment will be described below with reference to the drawings.
Note that the drawings are schematic or conceptual, and the relationship between the thickness and width of each part, the size ratio between parts, etc. are not necessarily the same as those in reality. Furthermore, even when the same part is shown, the dimensions and ratios may be shown differently depending on the drawing.
In the present specification and each figure, the same elements as those described above with respect to the existing figures are denoted by the same reference numerals, and detailed explanations are omitted as appropriate.

FIG. 1 is a block diagram schematically representing a lighting fixture according to an embodiment.
As shown in FIG. 1, the lighting fixture 2 includes a lighting device 10 and a light source module 100. The lighting device 10 is connected to the light source module 100. The light source module 100 is, for example, detachably connected to the lighting device 10. Further, the lighting device 10 is connected to a power source PS. The lighting device 10 is, for example, detachably connected to a power source PS. The lighting device 10 lights up the light source module 100 by supplying predetermined power to the light source module 100 based on the power supplied from the power source PS.

The light source module 100 includes, for example, a light source 102, a mounting detection resistor 104, and a connected portion 106. 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, or may be connected in series and in parallel, for example. The number of light sources 102 may be arbitrary. The number of light sources 102 may be one, for example.

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

The attachment detection resistor 104 is connected in parallel with the light source 102. The attachment detection resistor 104 is connected in parallel with each of the plurality of light sources 102, for example. The attachment detection resistor 104 is used in the lighting device 10 to detect connection of the light source module 100. The resistance value of the attachment detection resistor 104 may be any value that allows the lighting device 10 to appropriately detect the connection of the light source module 100.

The connected portion 106 is used for connection with the lighting device 10. The light source module 100 is detachably connected to the lighting device 10 via the connected portion 106. The light source module 100 is mechanically and electrically connected to the lighting device 10 via the connected portion 106.

The light source module 100 is, for example, a straight tube type LED lamp. However, the light source module 100 is not limited to this, and may be any light source module that includes at least a light source 102 and a mounting detection resistor 104 connected in parallel with the light source 102.

The lighting device 10 includes a connection section 12, a power conversion section 14, and a control section 16. The connecting portion 12 is connected to the connected portion 106 of the light source module 100. The light source module 100 is detachably connected to the lighting device 10 by connecting the connected portion 106 to the connecting portion 12 of the lighting device 10 .

The connecting portion 12 includes, for example, a first terminal 12a and a second terminal 12b. The first terminal 12a is connected to one end of the light source 102 and one end of the attachment detection resistor 104. The second terminal 12b is connected to the other end of the light source 102 and the other end of the attachment detection resistor 104. In this example, the attachment detection resistor 104 is connected in parallel with the light source 102 within the light source module 100.

The connected portion 106 has a terminal 106a connected to the first terminal 12a and a terminal 106b connected to the second terminal 12b. In this way, the connecting portion 12 and the connected portion 106 are, for example, two-terminal connectors.

The power conversion unit 14 converts input power into power compatible with the light source module 100 and supplies the converted power to the light source module 100 connected to the connection unit 12 . The power converter 14 is connected to a power source PS and receives input power from the power source PS.

The power converter 14 includes, for example, a pair of input terminals 14a and 14b and a pair of output terminals 14c and 14d. The power converter 14 is connected to a power source PS via a pair of input terminals 14a, 14b, and receives input power from the pair of input terminals 14a, 14b. Then, the power converter 14 outputs the converted power from a pair of output terminals 14c and 14d.

The power supply PS supplies, for example, AC power to the power conversion unit 14 as input power. The power supply PS is, for example, a commercial power supply. The power source PS may be, for example, a private generator. The power converter 14 converts the AC power supplied from the power source PS into DC power compatible with the light source module 100 and supplies the converted DC power to the light source module 100. Thereby, the power conversion unit 14 lights up the light source module 100. The power converter 14 outputs DC power to a pair of output terminals 14c and 14d. For example, the potential of the output terminal 14d is lower than the potential of the output terminal 14c. The output terminal 14c is a high potential side output terminal, and the output terminal 14d is a low potential side output terminal.

Note that the input power supplied to the lighting device 10 is not limited to alternating current power, and may be direct current power or the like. The power converter 14 may convert DC power into another DC power having a different current value or voltage value, and supply the converted DC power to the light source module 100.

The control unit 16 receives input of the dimming signal. The dimming signal is input to the control unit 16 from, for example, a remote control or a switch provided on a wall. The dimming signal may be input to the control unit 16 from, for example, another control device.

The control unit 16 controls the operation of the power conversion unit 14 according to the dimming signal, thereby lighting the light source module 100 at a brightness corresponding to the dimming level indicated by the dimming signal.

The lighting device 10 further includes a connection detection section 18 and a detection circuit 20. The connection detection unit 18 detects the connection of the light source module 100 based on, for example, a change in voltage depending on whether the light source module 100 is connected. In other words, the connection detection unit 18 detects voltage changes depending on whether the attachment detection resistor 104 is connected or not connected between the first terminal 12a and the second terminal 12b. Connection of the light source module 100 is detected.

The connection detection section 18 is connected to the control section 16. The connection detection unit 18 inputs the connection detection result of the light source module 100 to the control unit 16. When the connection detection unit 18 detects the connection of the light source module 100, the control unit 16 controls the operation of the power conversion unit 14 based on the dimming signal, thereby adjusting the level of dimming according to the degree of dimming indicated by the dimming signal. The light source module 100 is turned on with brightness.

The control unit 16 stops the supply of power from the power conversion unit 14 to the light source module 100 when the connection detection unit 18 does not detect the connection of the light source module 100. Thereby, unnecessary power consumption in the lighting fixture 2 can be suppressed. Further, for example, it is possible to prevent a state in which a large voltage is continuously applied to the connection portion 12, and to further improve the safety of the lighting fixture 2.

The detection circuit 20 is provided between the connection section 12 and the power conversion section 14 and detects only the current flowing through the light source 102 out of the current flowing through the light source module 100. That is, the detection circuit 20 excludes the current flowing through the attachment detection resistor 104 from among the current flowing through the light source module 100, and detects only the current flowing through the light source 102. The detection circuit 20 is connected to the control section 16 and inputs the detection result of the current flowing through the light source 102 to the control section 16 .

The control unit 16 controls the operation of the power conversion unit 14 based on the detection result of the detection circuit 20 so that a constant current flows to the light source 102. That is, the control unit 16 feedback-controls the operation of the power conversion unit 14 based on the detection result of the detection circuit 20 so that a constant current flows to the light source 102. The power converter 14 is, for example, a constant current circuit that supplies a substantially constant current to the light source module 100.

The detection circuit 20 includes, for example, a voltage detection section 21, a current calculation section 22, a branch circuit 23, and a current detection section 24. The voltage detection section 21 detects the output voltage of the power conversion section 14 and inputs the detection result to the current calculation section 22 .

The current calculation unit 22 has information on the resistance value of the attachment detection resistor 104. The current calculation unit 22 estimates the current flowing through the attachment detection resistor 104 based on the output voltage of the power conversion unit 14 detected by the voltage detection unit 21 and the resistance value of the attachment detection resistor 104. More specifically, when the output voltage of the power converter 14 is V, the resistance value of the attachment detection resistor 104 is R, and the current flowing through the attachment detection resistor 104 is I, the current calculation unit 22 calculates I. =V/R, the current flowing through the attachment detection resistor 104 is estimated. The current calculation unit 22 inputs the estimated value of the current flowing through the attachment detection resistor 104 to the branch circuit 23 .

The branch circuit 23 is provided, for example, between the second terminal 12b of the connection section 12 and the low potential side output terminal 14d of the power conversion section 14. The branch circuit 23 branches the current flowing from the light source module 100 into the output terminal 14d of the power converter 14 into two paths, a first path 23a and a second path 23b. The branch circuit 23 divides the current flowing from the light source module 100 into the current flowing through the light source 102 and the attachment detection resistor 104 by subtracting the estimated value of the current flowing through the attachment detection resistor 104 from the current flowing through the light source module 100. It is divided into the flowing current. Then, the branch circuit 23 causes the current flowing through the light source 102 to flow through the first path 23a, and causes the current flowing through the attachment detection resistor 104 to flow through the second path 23b.

The current detection section 24 is provided on the first path 23a. Thereby, the current detection unit 24 detects only the current flowing through the light source 102 out of the current flowing through the light source module 100. The current detection unit 24 is connected to the control unit 16 and inputs the detection result of the current flowing through the light source 102 to the control unit 16.

In this way, the detection circuit 20 estimates the current flowing through the attachment detection resistor 104 based on the output voltage of the power converter 14 and the resistance value of the attachment detection resistor 104, and detects the attachment based on the current flowing through the light source module 100. By subtracting the estimated value of the current flowing through the detection resistor 104, only the current flowing through the light source 102 is detected.

FIG. 2 is a graph schematically representing an example of the operation of the control unit according to the embodiment.
As shown in FIG. 2, the control unit 16 controls the operation of the power conversion unit 14 to increase the current flowing through the light source module 100 as the dimming level increases, thereby increasing the brightness according to the dimming level. The light source module 100 is turned on.

Further, as shown in FIG. 2, the control unit 16 determines the slope of the change in the degree of dimming of the current supplied to the light source module 100, in the first region R1 where the degree of dimming is less than a predetermined value, the degree of dimming is greater than or equal to a predetermined value. The second region R2 is made smaller than the second region R2. The predetermined value is, for example, a dimming level of 10%. The first region R1 is, for example, a region where the degree of light control is less than 10%, and the second region R2 is, for example, a region where the degree of light control is 10% or more.

When power is supplied to the light source module 100 having the attachment detection resistor 104 connected in parallel with the light source 102 and the light source module 100 is turned on at a brightness corresponding to the dimming level indicated by the dimming signal, the dimming level is lowered. When the current supplied to the light source module 100 becomes small, the proportion of the current flowing to the attachment detection resistor 104 side increases, and the light source 102 may turn off.

Therefore, the control unit 16 makes the slope of the change in the degree of dimming of the current supplied to the light source module 100 smaller in the first region R1 where the degree of dimming is less than a predetermined value than in the second region R2 where the degree of dimming is equal to or higher than the predetermined value. do. As a result, when the dimming level is lowered, compared to the case where the current is made smaller with the same slope as the second region R2, a current of a magnitude that takes into account the amount flowing to the attachment detection resistor 104 side is supplied to the light source module 100. can do. Thereby, even when setting the dimming level below a predetermined value, it is possible to prevent the light source 102 from being unintentionally turned off.

The slope S2 of the change in current in the second region R2 is set, for example, based on the relative luminous intensity when the rated current is set to 100% of the dimming level. The slope S1 of the change in current in the first region R1 may be appropriately set in consideration of the current flowing to the attachment detection resistor 104 side.

Note that in FIG. 2, the slope S1 in the first region R1 and the slope S2 in the second region R2 are each substantially constant. The slope S1 may change within the first region R1, for example. The slope S2 may change within the second region R2, for example. The slope S1 may be, for example, the average slope in the first region R1. The slope S2 may be, for example, the average slope in the second region R2. In other words, the control unit 16 sets the average slope of the change of the current supplied to the light source module 100 with respect to the dimming level in a first region R1 where the dimming level is less than a predetermined value than in a second region R2 where the dimming level is equal to or higher than a predetermined value. You can also make it smaller.

FIG. 3 is a graph schematically representing an example of the operation of the control unit according to the embodiment.
As shown in FIG. 3, when the degree of dimming is less than a predetermined value, the control unit 16 controls the current to be supplied to the light source module 100 according to the increase in the voltage applied to the light source module 100 for the same degree of dimming. Make it bigger.

A plurality of types of light source modules 100 having different brightness may be connected to the lighting device 10. The lighting device 10 attempts to supply the same amount of current when the dimming level is the same whether the light source module 100 with high brightness is connected or the light source module 100 with low brightness is connected. do. Therefore, when a light source module 100 with high brightness is connected, the voltage applied to the light source module 100 becomes higher than when a light source module 100 with low brightness is connected. In this way, when the light source module 100 with high brightness is connected and a high voltage is applied to the light source module 100, the current flowing to the mounting detection resistor 104 side becomes larger than when the voltage is low.

Therefore, when the degree of dimming is less than a predetermined value, the control unit 16 increases the current supplied to the light source module 100 in accordance with the increase in the voltage applied to the light source module 100 for the same degree of dimming. Thereby, it is possible to supply the light source module 100 with a current having a magnitude that takes into account the amount of current flowing to the mounting detection resistor 104 side as the voltage increases. This makes it possible to more reliably prevent the light source 102 from being unintentionally turned off even when setting the dimming level below a predetermined value.

As described above, in the lighting fixture 2 and the lighting device 10 according to the present embodiment, the control unit 16 controls the slope of the change in the dimming degree of the current supplied to the light source module 100 at the point where the dimming degree is less than a predetermined value. In one region R1, the degree of dimming is made smaller than in the second region R2, which is equal to or higher than a predetermined value. Thereby, even when setting the dimming level below a predetermined value, it is possible to prevent the light source 102 from being unintentionally turned off. Therefore, even when the attachment detection resistor 104 is provided in parallel with the light source 102, it is possible to provide the lighting device 10 and the lighting fixture 2 that can suppress turning off of the light source 102 at a low dimming level.

Furthermore, in the lighting fixture 2 and the lighting device 10 , the control unit 16 controls the operation of the power conversion unit 14 based on the detection result of the detection circuit 20 so that a constant current flows through the light source 102 . In this way, by reducing the amount of current flowing through the attachment detection resistor 104 from the current feedback loop, it is possible to more reliably suppress turning off of the light source 102 at a low dimming level.

Furthermore, in the lighting fixture 2 and the lighting device 10, when the dimming level is less than a predetermined value, the control unit 16 controls the light source module 100 according to an increase in the voltage applied to the light source module 100 for the same dimming level. Increase the supplied current. As a result, even if a high-brightness light source module 100 is connected and a high voltage is applied to the light source module 100, the light source 102 may turn off unintentionally when the dimming intensity is set below a predetermined value. This can be suppressed more reliably.

FIG. 4 is a block diagram schematically showing a modification of the lighting fixture according to the embodiment.
As shown in FIG. 4, in the lighting fixture 2a and the lighting device 10a, the connecting portion 12 further includes a third terminal 12c, and the connected portion 106 of the light source module 100a is a terminal connected to the third terminal 12c. 106c. In this example, the connecting portion 12 and the connected portion 106 are, for example, three-terminal connectors. Components that are substantially the same in function and configuration as those in the above embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

A terminal 106c of the connected portion 106 is connected to one end of the attachment detection resistor 104. More specifically, the terminal 106c is connected to the high potential side terminal of the attachment detection resistor 104. Thereby, the light source module 100a outputs the current value flowing through the attachment detection resistor 104 from the terminal 106c.

In the light source module 100a, the detection circuit 20a includes a branch circuit 23 and a current detection section 24. In the detection circuit 20a, the branch circuit 23 is connected to the second terminal 12b of the connection section 12 and also connected to the third terminal 12c. Thereby, the branch circuit 23 acquires the value of the current flowing from the light source module 100a to the attachment detection resistor 104.

The branch circuit 23 divides the current flowing from the light source module 100a into the current flowing through the light source 102 and the attachment detection resistor 104 by subtracting the current value of the current flowing through the attachment detection resistor 104 from the current flowing through the light source module 100a. It is divided into the flowing current. Then, the branch circuit 23 causes the current flowing through the light source 102 to flow through the first path 23a, and causes the current flowing through the attachment detection resistor 104 to flow through the second path 23b.

The current detection unit 24 detects only the current flowing through the light source 102 out of the current flowing through the light source module 100a. The current detection unit 24 is connected to the control unit 16 and inputs the detection result of the current flowing through the light source 102 to the control unit 16.

In this way, the detection circuit 20a acquires the value of the current flowing through the attachment detection resistor 104 from the light source module 100a, and subtracts the current value of the current flowing through the attachment detection resistor 104 from the current flowing through the light source module 100a. Only the current flowing through the light source 102 is detected.

Also in the lighting fixture 2a and the lighting device 10a, the detection circuit 20a detects only the current flowing through the light source 102. The control unit 16 controls the operation of the power conversion unit 14 so that a constant current flows to the light source 102 based on the detection result of the detection circuit 20a. As a result, in the lighting fixture 2a and the lighting device 10a, as in the above embodiment, the amount of current flowing from the current feedback loop to the attachment detection resistor 104 is reduced, and the light source 102 is more reliably turned off at low dimming level. Can be suppressed.

In this way, the configuration of the detection circuit is not limited to the configuration in which the current flowing through the attachment detection resistor 104 is estimated based on the output voltage of the power converter 14 and the resistance value of the attachment detection resistor 104; The configuration may be such that the current value flowing through the attachment detection resistor 104 is acquired from the attachment detection resistor 100a. This allows the lighting device to more accurately grasp the value of the current flowing through the attachment detection resistor 104 than when it is estimated. On the other hand, in the configuration in which estimation is performed based on the output voltage and the resistance value, a two-terminal connector is sufficient, and the configurations of the connecting portion 12 and the connected portion 106 can be simplified.

FIG. 5 is a block diagram schematically representing a modification of the lighting fixture according to the embodiment.
As shown in FIG. 5, in the lighting fixture 2b and the lighting device 10b, the connection part 12 has a first terminal 12a connected to one end of the light source 102 and one end of the attachment detection resistor 104, and a first terminal 12a connected to the other end of the light source 102. It has a second terminal 12b to be connected, and a third terminal 12c to be connected to the other end of the attachment detection resistor 104.

The connected portion 106 of the light source module 100b has a terminal 106a connected to the first terminal 12a, a terminal 106b connected to the second terminal 12b, and a terminal 106c connected to the third terminal 12c. The other end of the attachment detection resistor 104 is connected only to the terminal 106c.

In this example, when the light source module 100b is connected to the lighting device 10b, the attachment detection resistor 104 is connected in parallel with the light source 102 in the lighting device 10b.

The detection circuit 20b includes a current detection section 24 provided between the second terminal 12b and the output terminal 14d of the power conversion section 14, and the current detection section 24 detects only the current flowing to the light source 102.

Also in the lighting fixture 2b and the lighting device 10b, the detection circuit 20b detects only the current flowing to the light source 102. The control unit 16 controls the operation of the power conversion unit 14 so that a constant current flows to the light source 102 based on the detection result of the detection circuit 20b. As a result, in the lighting fixture 2b and the lighting device 10b, similarly to the above embodiment, the amount of current flowing from the current feedback loop to the attachment detection resistor 104 is reduced, and the light source 102 is more reliably turned off at a low dimming level. Can be suppressed.

In this way, when the light source module 100b is connected to the lighting device 10b, the attachment detection resistor 104 is connected in parallel with the light source 102 in the lighting device 10b, and a current is applied to the path connected only to the light source 102. By providing the detection unit 24, only the current flowing through the light source 102 may be detected. This allows the lighting device to more accurately grasp the value of the current flowing through the attachment detection resistor 104, compared to the case where it is estimated based on the output voltage and the resistance value. Furthermore, in the lighting device 10b, there is no need to provide a branch circuit 23, etc., and the configuration of the detection circuit 20b can be made simpler. On the other hand, in the configuration in which estimation is performed based on the output voltage and the resistance value, a two-terminal connector is sufficient, and the configurations of the connecting portion 12 and the connected portion 106 can be simplified.

FIG. 6 is a block diagram schematically showing a modification of the lighting fixture according to the embodiment.
As shown in FIG. 6, in the lighting fixture 2c and the lighting device 10c, the detection circuit 20c includes a voltage detection section 21, a current calculation section 22, and a current detection section 24. In the detection circuit 20c, the current calculation unit 22 inputs the estimated value of the current flowing through the attachment detection resistor 104 to the control unit 16. Further, the current detection unit 24 inputs the detection result of the current flowing through the light source module 100c to the control unit 16.

The control unit 16 detects the current flowing through the light source 102 by subtracting the estimated value of the current flowing through the attachment detection resistor 104 from the current flowing through the light source module 100c.

In this way, the estimated value of the current flowing through the attachment detection resistor 104 and the detection result of the current flowing through the light source module 100c are input to the control unit 16, and the control unit 16 performs a subtraction operation, thereby controlling the light source 102. The control unit 16 may detect the current flowing through. In this case as well, similarly to the above embodiment, the amount of current flowing from the current feedback loop to the attachment detection resistor 104 can be reduced to more reliably suppress turning off of the light source 102 at a low dimming level.

Note that, as in the example shown in FIG. 4, when the value of the current flowing from the light source module to the resistance for attachment detection 104 is acquired, the acquired current value is input to the control unit 16, and the attachment is detected from the current flowing to the light source module. The control unit 16 may detect the current flowing through the light source 102 by subtracting the current value of the current flowing through the resistor 104 .

Although several embodiments of the invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are included within the scope and gist of the invention, as well as within the scope of the invention described in the claims and its equivalents.

2, 2a to 2c lighting fixture, 10, 10a to 10c lighting device, 12 connection unit, 14 power conversion unit, 16 control unit, 18 connection detection unit, 20, 20a to 20c detection circuit, 21 voltage detection unit, 22 current calculation part, 23 branch circuit, 24 current detection part, 100, 100a to 100c light source module, 102 light source, 104 attachment detection resistor, 106 connected part

Claims (6)

a connection part connected to a light source module having a light source and a mounting detection resistor connected in parallel with the light source;
a power conversion unit that converts input power into power corresponding to the light source module and supplies the converted power to the light source module connected to the connection part;
a control unit that receives an input of a dimming signal and controls the operation of the power conversion unit in accordance with the dimming signal to turn on the light source module at a brightness corresponding to a dimming level indicated by the dimming signal; ,
a detection circuit that is provided between the connection section and the power conversion section and detects only the current flowing to the light source out of the current flowing to the light source module;
Equipped with
The control unit makes the slope of the change of the current supplied to the light source module with respect to the dimming level smaller in a first area where the dimming level is less than a predetermined value than in a second area where the dimming level is equal to or higher than the predetermined value. At the same time, the lighting device controls the operation of the power conversion unit based on the detection result of the detection circuit so that a constant current flows to the light source . The detection circuit estimates the current flowing through the attachment detection resistor based on the output voltage of the power conversion unit and the resistance value of the attachment detection resistor, and estimates the current flowing through the attachment detection resistor based on the current flowing through the light source module. The lighting device according to claim 1 , wherein only the current flowing through the light source is detected by subtracting an estimated value of the current flowing through the light source. The detection circuit acquires a current value flowing from the light source module to the attachment detection resistor, and subtracts the current value of the current flowing to the attachment detection resistor from the current flowing to the light source module, thereby detecting the current flowing to the light source. The lighting device according to claim 1 , which detects only current. The connection part is
a first terminal connected to one end of the light source and one end of the attachment detection resistor;
a second terminal connected to the other end of the light source;
a third terminal connected to the other end of the attachment detection resistor;
has
The lighting device according to claim 1 , wherein the detection circuit includes a current detection section provided between the second terminal and the power conversion section, and the current detection section detects only the current flowing to the light source. . a connection part connected to a light source module having a light source and a mounting detection resistor connected in parallel with the light source;
a power conversion unit that converts input power into power corresponding to the light source module and supplies the converted power to the light source module connected to the connection part;
a control unit that receives an input of a dimming signal and controls the operation of the power conversion unit in accordance with the dimming signal to turn on the light source module at a brightness corresponding to a dimming level indicated by the dimming signal; ,
Equipped with
The control unit makes the slope of the change of the current supplied to the light source module with respect to the dimming level smaller in a first area where the dimming level is less than a predetermined value than in a second area where the dimming level is equal to or higher than the predetermined value. At the same time, when the dimming level is less than a predetermined value, the lighting device increases the current supplied to the light source module according to the increase in the voltage applied to the light source module for the same dimming level. a light source module having a light source and a resistance for attachment detection connected in parallel with the light source;
The lighting device according to any one of claims 1 to 5 ,
Lighting equipment with.

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