JP2022150564A - Luminaire and lighting device - Google Patents

Abstract

To provide a luminaire and a lighting device capable of achieving both a power supply monitoring function and a dimming function with a simpler configuration.SOLUTION: A luminaire includes a lighting device for converting power supplied from a power source into DC power suitable for a light source portion and supplying the DC power. The lighting device includes a power conversion circuit, a control unit for controlling an operation of power conversion by the power conversion circuit, a dimming signal input circuit for inputting a dimming signal representing the dimming degree of the light source portion to the control unit, and a power monitoring circuit for detecting a drop in the power supply voltage of the power supply. The dimming signal input circuit and the power supply monitoring circuit input a dimming signal for setting the dimming degree to 0% to an input unit of the control unit when a drop in the power supply voltage of the power supply is detected, thereby causing the control unit to stop the control of the operation of the power conversion circuit.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD Embodiments of the present invention relate to lighting fixtures and lighting devices.

2. Description of the Related Art A lighting fixture including a light source unit having a light source such as an LED and a lighting device that supplies power to the light source unit to light the light source is known. The lighting device includes a power conversion circuit that converts power supplied from a power source into power corresponding to a light source, and a control unit that controls the operation of the power conversion circuit.

In such a lighting device, if power supply to the control unit is insufficient due to a drop in power supply voltage during operation of the control unit, the control unit stops operating. After stopping the operation, the control unit resumes the operation when the power supply becomes sufficient. At this time, if the power supply voltage rises slowly, there is a possibility that after the control unit starts operating, the power supply voltage will drop again as the control unit starts up, and the control unit will stop again. In this way, if the control unit stops immediately after being started, for example, the light source unit may appear to turn on for a moment and then turn off immediately, which may cause discomfort to the user.

Also, when the control unit is controlling the operation of the power conversion circuit, if the power supply experiences a sudden voltage fluctuation such as a momentary power failure or momentary power failure, the operation of the control unit becomes unstable, causing the control unit to malfunction. It may come to a standstill. In this case, after the power supply returns to a normal state, the power supply to the control unit is once stopped and turned on again, and unless the control unit is properly restarted, the control unit will not return. In other words, unless the control unit is properly restarted, the light source unit will not turn on.

Therefore, it has been proposed to provide the lighting device with a power supply monitoring circuit. The power supply monitoring circuit monitors the power supply voltage, and when the power supply voltage becomes equal to or lower than the threshold, inputs a signal to the control unit to cause the control unit to stop controlling the operation of the power conversion circuit. In other words, the power monitoring circuit turns off the light source when the power supply voltage becomes equal to or less than the threshold. After causing the control unit to stop controlling the operation of the power conversion circuit, the power supply monitoring circuit causes the control unit to resume control of the operation of the power conversion circuit when the power supply voltage becomes equal to or higher than the threshold. The power supply monitoring circuit causes the control unit to stop controlling the operation of the power conversion circuit, and then turns on the light source unit when the power supply voltage becomes equal to or higher than the threshold.

The threshold value of the power supply monitoring circuit is set within a range in which the control unit can operate properly. In this way, before the control unit stops operating due to a drop in the power supply voltage, or before the control unit enters an abnormal stop state due to a sudden voltage fluctuation, the signal from the power supply monitoring circuit is detected. Based on the input, the controller stops controlling the operation of the power conversion circuit. As a result, even when a sudden voltage fluctuation occurs, it is possible to prevent the control unit from entering an abnormal stopped state. Then, when the power supply voltage becomes equal to or higher than the threshold, the control unit resumes control of the operation of the power conversion circuit, so that even when the power supply voltage rises slowly, the control unit immediately stops after starting. You can prevent it from happening.

Further, in the lighting device, the brightness of the light emitted from the light source is also changed by inputting a dimming signal to the control section.

However, inputting the signal from the power supply monitoring circuit and the dimming signal to the control unit complicates the configuration of the control unit. For example, an input section (e.g., an input port) for receiving a signal from a power supply monitoring circuit and an input section for receiving a dimming signal are required in a control section, and a control section having only one input section is required. Therefore, it is not possible to achieve both the power supply monitoring function and the dimming function.

For this reason, it is desired that a lighting fixture and a lighting device have both a power supply monitoring function and a dimming function with a simpler configuration.

Japanese Patent No. 5401937

Embodiments of the present invention provide a lighting fixture and a lighting device that can achieve both a power supply monitoring function and a dimming function with a simpler configuration.

According to the embodiment, the light source unit has a light source, the power supplied from the power source is converted into DC power corresponding to the light source unit, and the DC power is supplied to the light source unit to light the light source unit. a lighting device, wherein the lighting device converts the power supplied from the power source into the DC power corresponding to the light source unit and supplies the DC power to the light source unit; a control unit for controlling the operation of power conversion by a power conversion circuit; a dimming signal input circuit for inputting to a control unit; and a power supply monitoring circuit for detecting a drop in the power supply voltage of the power supply. The control unit has an input unit for receiving the input of the dimming signal. Then, by controlling the power conversion operation of the power conversion circuit according to the dimming signal input from the dimming signal input circuit, the amount of light corresponding to the degree of dimming represented by the dimming signal is controlled. DC power is supplied from the power conversion circuit to the light source unit to light the light source unit with brightness corresponding to the degree of dimming; By inputting the dimming signal for setting the dimming degree to 0% to the input unit of the control unit when a drop in the power supply voltage of the power source is detected, the control unit is instructed to operate the power conversion circuit. From a state in which the control is stopped and the dimming signal for setting the dimming degree to 0% is input to the input section of the control section when the power supply monitoring circuit detects recovery of the power supply voltage of the power supply. and a lighting fixture that returns the dimming signal corresponding to the control signal to the input section of the control section.

A lighting fixture and a lighting device are provided that can achieve both a power supply monitoring function and a dimming function with a simpler configuration.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which represents typically the lighting fixture and lighting device which concern on 1st Embodiment. It is a block diagram showing typically the modification of the lighting fixture and lighting device which concern on 1st Embodiment. It is a block diagram which represents typically the lighting fixture and lighting device which concern on 2nd 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 portion, the size ratio between portions, and the like are not necessarily the same as the actual ones. Also, even when the same parts are shown, the dimensions and ratios may be different depending on the drawing.
In addition, in the present specification and each figure, the same reference numerals are given to the same elements as those described above with respect to the already-appearing figures, and detailed description thereof will be omitted as appropriate.

(First embodiment)
FIG. 1 is a block diagram schematically showing a lighting fixture and a lighting device according to the first embodiment.
As shown in FIG. 1 , the lighting fixture 10 includes a light source section 12 and a lighting device 14 . The light source unit 12 has a light source. The light source unit 12 has, for example, a plurality of light sources. A plurality of light sources are connected in series, in parallel, or in series-parallel, for example. However, the number of light sources provided in the light source unit 12 may be one.

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

The lighting device 14 is connected to the power source 2 . The lighting device 14 is detachably connected to the power supply 2, for example. AC power is supplied from the power source 2 to the lighting device 14 , for example. The power supply 2 is, for example, a commercial power supply. The AC voltage of the AC power supplied from the power supply 2 is, for example, 100V to 242V (effective value). The power source 2 may be, for example, a private power generator. The power supplied to the lighting device 14 is not limited to AC power, and may be DC power or the like.

The lighting device 14 is connected to the light source section 12 . The lighting device 14 is detachably connected to the light source unit 12, for example. The lighting device 14 converts the power supplied from the power supply 2 into DC power corresponding to the light source unit 12 and supplies the converted DC power to the light source unit 12 . In this example, the lighting device 14 converts AC power supplied from the power source 2 into DC power corresponding to the light source unit 12 and supplies the converted DC power to the light source unit 12 . Thereby, the lighting device 14 lights the light source section 12 .

The lighting device 14 has a rectifying circuit 20 , a power conversion circuit 22 , a control section 24 , a controlled power generation circuit 26 , a dimming signal input circuit 28 , and a power monitoring circuit 30 .

The rectifier circuit 20 rectifies the AC power supplied from the power supply 2 to convert the AC power into rectified power. A diode bridge in which four rectifying elements are combined is used for the rectifying circuit 20, for example. That is, the rectifier circuit 20 is a full wave rectifier. The rectified power is, for example, pulsating power.

Rectifier circuit 20 may be a half-wave rectifier or the like. The rectified power may be full-wave rectified pulsating current or half-wave rectified pulsating current. A Schottky barrier diode, for example, is used for the rectifier circuit 20 . Thereby, for example, good responsiveness can be obtained. If the power supplied from the power supply 2 is DC power, the rectifier circuit 20 can be omitted. The rectifying circuit 20 is provided in the lighting device 14 as necessary and can be omitted.

The power conversion circuit 22 converts the power supplied from the power supply 2 through the rectifier circuit 20 into DC power corresponding to the light source section 12 and supplies the converted DC power to the light source section 12 . Thereby, the power conversion circuit 22 lights the light source unit 12 . In this example, the power conversion circuit 22 converts the rectified power after being rectified by the rectifier circuit 20 into DC power. For example, when the power supplied from the power supply 2 is DC power, the power conversion circuit 22 converts the DC power supplied from the power supply 2 into another DC power corresponding to the light source section 12 .

The power conversion circuit 22 has a switching element, and performs power conversion by switching the switching element. The power conversion circuit 22 has, for example, one of a power factor correction circuit, a boost circuit, and a step-down circuit. The power conversion circuit 22 may have a plurality of switching elements such as a switching element for a power factor correction circuit and a switching element for a step-down circuit.

The control unit 24 controls the operation of power conversion by the power conversion circuit 22 . The control unit 24 controls the operation of power conversion by the power conversion circuit 22 by controlling the switching of the switching elements provided in the power conversion circuit 22 .

The control power generation circuit 26 converts the power supplied from the power supply 2 into DC power corresponding to the control unit 24 and supplies the converted DC power to the control unit 24 . The control power generation circuit 26 is connected to the output side of the rectifier circuit 20, for example. The control power generation circuit 26 converts the rectified power rectified by the rectifier circuit 20 into DC power, and supplies the converted DC power to the control unit 24 . For example, when the power supplied from the power supply 2 is DC power, the control power generation circuit 26 converts the DC power supplied from the power supply 2 into another DC power corresponding to the control unit 24, and after conversion of DC power is supplied to the control unit 24 . The control unit 24 operates based on the supply of DC power from the control power generation circuit 26 .

The dimming signal input circuit 28 communicates with the external device 4 . Communication between the dimming signal input circuit 28 and the external device 4 may be wired or wireless. The dimming signal input circuit 28 may be a communication device that communicates with the external device 4 by wire, or may be a communication device that communicates with the external device 4 by radio. The configuration of the dimming signal input circuit 28 may be any configuration that allows communication with the external device 4 .

The dimming signal input circuit 28 communicates with the external device 4 to receive an input of a control signal representing the degree of dimming of the light source unit 12 from the external device 4 . The external device 4 is, for example, a dimmer, a remote controller, or the like for setting the dimming degree of the lighting fixture 10 . The external device 4 may be, for example, a mobile terminal such as a smart phone owned by the user of the lighting device 10 . The external device 4 may be any device capable of communicating with the dimming signal input circuit 28 and inputting a control signal indicating the degree of dimming of the light source unit 12 to the dimming signal input circuit 28 .

The dimming signal input circuit 28 is connected to the controller 24 . The dimming signal input circuit 28, for example, converts a control signal input from the external device 4 into a signal corresponding to the control unit 24, thereby generating a dimming signal representing the degree of dimming of the light source unit 12 according to the control signal. A dimming signal is generated and input to the control unit 24 . If signal conversion is not necessary, the dimming signal input circuit 28 may input the control signal input from the external device 4 as it is to the control section 24 as the dimming signal.

The dimming signal input from the dimming signal input circuit 28 to the control unit 24 is, for example, a signal that switches between the first voltage and the second voltage at a predetermined cycle. The second voltage is set to a value greater than the first voltage. The first voltage is, for example, low (eg, 0V). The second voltage is, for example, high (eg +5V). The dimming signal is, for example, a digital signal.

The dimming signal input circuit 28 changes the duty ratios of the first voltage and the second voltage according to the degree of dimming. For example, the dimming signal input circuit 28 sets the duty ratio to 0% (the first voltage during the entire period) at a dimming degree of 0%, and sets the duty ratio to 100% (the second voltage during the entire period) at a dimming degree of 100%. voltage). As a result, the control unit 24 can recognize the degree of dimming according to the duty ratio of the dimming signal.

However, the dimming signal is, for example, a first voltage at a dimming degree of 0% and a second voltage at a dimming degree of 100%. It may be a signal or the like. The dimming signal may be any signal that allows the control unit 24 to appropriately recognize the dimming degree of the light source unit 12 .

The control signal is not limited to that from the external device 4. For example, an operation unit for setting the degree of dimming is provided in the lighting device 14, and based on the operation of the operation unit by the user, a dimming signal is sent from the operation unit. It may be input to the input circuit 28 . The configuration of the dimming signal input circuit 28 may be any configuration capable of receiving an input of a control signal and inputting a dimming signal representing the dimming degree of the light source unit 12 according to the control signal to the control unit 24 .

The control unit 24 has an input unit 24a for receiving the input of the dimming signal. The control section 24 is connected to the dimming signal input circuit 28 via the input section 24a. The dimming signal input circuit 28 inputs the dimming signal to the input section 24 a of the control section 24 . The control unit 24 controls the power conversion operation of the power conversion circuit 22 according to the dimming signal input from the dimming signal input circuit 28 . The control unit 24 controls switching of the switching element provided in the power conversion circuit 22 according to the dimming signal input from the dimming signal input circuit 28, for example. As a result, the control unit 24 supplies DC power having a magnitude corresponding to the degree of dimming indicated by the dimming signal from the power conversion circuit 22 to the light source unit 12, and lights the light source unit 12 with brightness corresponding to the degree of dimming. .

The power monitoring circuit 30 monitors the power supply voltage of the power supply 2 by detecting a drop in the power supply voltage of the power supply 2 . In this example, the power monitor circuit 30 is connected to the output side of the rectifier circuit 20 . The power supply monitor circuit 30 monitors the power supply voltage of the power supply 2 based on the rectified power rectified by the rectifier circuit 20, for example.

For example, the power supply monitoring circuit 30 smoothes the output voltage of the rectifier circuit 20 using a capacitor or the like, and sets a first threshold for the smoothed voltage. In other words, the power supply monitoring circuit 30 sets the first threshold for the effective value of the AC voltage of the power supply 2 . The power supply monitoring circuit 30 detects a drop in the power supply voltage of the power supply 2 when the smoothed voltage becomes equal to or lower than the first threshold. For example, when the power of the power supply 2 is DC power, the power supply monitoring circuit 30 sets a first threshold for the DC voltage of the power supply 2, and when the DC voltage becomes equal to or less than the first threshold, the power supply 2, a drop in power supply voltage may be detected.

Thus, the voltage that sets the first threshold may be any voltage related to the power supply voltage of power supply 2 . The power monitoring circuit 30 detects a drop in the power supply voltage of the power supply 2 when the voltage related to the power supply voltage of the power supply 2 becomes equal to or lower than the first threshold. The first threshold value of the power supply monitoring circuit 30 is set within a range in which the control section 24 can operate properly. In other words, the first threshold of the power supply monitoring circuit 30 is set to a value higher than the minimum voltage at which the control section 24 can operate properly.

The dimming signal input circuit 28 and the power supply monitoring circuit 30 transmit a dimming signal for setting the dimming level to 0% when the power supply monitoring circuit 30 detects a drop in the power supply voltage of the power supply 2. , the control unit 24 stops controlling the operation of the power conversion circuit 22 . Accordingly, the dimming signal input circuit 28 and the power supply monitoring circuit 30 turn off the light source section 12 when the power supply monitoring circuit 30 detects a drop in the power supply voltage of the power supply 2 .

In this example, the power monitoring circuit 30 is connected to the input section 24 a of the control section 24 together with the dimming signal input circuit 28 . The power supply monitoring circuit 30 inputs a dimming signal corresponding to the control signal output from the dimming signal input circuit 28 to the input section 24a of the control section 24 in a state where a drop in the power supply voltage of the power supply 2 is not detected. . In other words, the power supply monitoring circuit 30 inputs the dimming signal output from the dimming signal input circuit 28 to the input section 24a of the control section 24 as it is when a drop in the power supply voltage of the power supply 2 is not detected. . As a result, in a normal state in which a drop in the power supply voltage of the power supply 2 is not detected, a dimming signal corresponding to the dimming degree set in the external device 4 is input to the control unit 24 and set in the external device 4. The light source unit 12 is lit with brightness corresponding to the dimming degree.

On the other hand, when the power supply monitoring circuit 30 detects a drop in the power supply voltage of the power supply 2, regardless of the state of the dimming signal output from the dimming signal input circuit 28, the power supply monitor circuit 30 inputs the The dimming signal is set to a dimming degree of 0%.

The power supply monitoring circuit 30 has, for example, a switching element for setting the voltage of the control section 24 to the first voltage. A switching element is provided, for example, between the input section 24a and a common potential (for example, ground). The dimming signal input circuit 28 is connected between the input section 24 a and the switching element of the power supply monitoring circuit 30 .

The power supply monitoring circuit 30 turns off the switching element when a drop in the power supply voltage of the power supply 2 is not detected. As a result, the dimming signal output from the dimming signal input circuit 28 is input to the input section 24a of the control section 24 as it is when a drop in the power supply voltage of the power supply 2 is not detected.

The power monitoring circuit 30 turns on the switching element when a drop in the power supply voltage of the power supply 2 is detected. As a result, when a drop in the power supply voltage of the power supply 2 is detected, regardless of the state of the dimming signal output from the dimming signal input circuit 28, the voltage of the input section 24a of the control section 24 is the first voltage. , and the dimming signal input to the input section 24a of the control section 24 is set to a state of 0% dimming.

Further, the power supply monitoring circuit 30 detects recovery of the power supply voltage of the power supply 2 after detecting a drop in the power supply voltage of the power supply 2 . The power supply monitoring circuit 30, for example, sets a second threshold for a voltage related to the power supply voltage of the power supply 2, similar to the first threshold. The power supply monitoring circuit 30 detects recovery of the power supply voltage of the power supply 2 when the voltage related to the power supply voltage of the power supply 2 becomes equal to or higher than the second threshold after becoming equal to or lower than the first threshold.

The dimming signal input circuit 28 and the power supply monitoring circuit 30 send a dimming signal for setting the dimming level to 0% when the power supply monitoring circuit 30 detects recovery of the power supply voltage of the power supply 2. , to a state in which a dimming signal corresponding to the control signal is input to the input section 24 a of the control section 24 .

The power supply monitoring circuit 30, for example, switches the switching element from an ON state to an OFF state in response to detecting the recovery of the power supply voltage of the power supply 2, thereby outputting a dimming signal for setting the dimming level to 0%. 24 is returned to a state in which a dimming signal corresponding to the control signal is input to the input section 24a of the control section 24 .

As a result, the dimming signal input circuit 28 and the power supply monitoring circuit 30 cause the control unit 24 to resume control of the operation of the power conversion circuit 22 in response to the detection of the recovery of the power supply voltage of the power supply 2, and the power conversion circuit 22 is set by the control signal. The light source unit 12 is lit with brightness according to the degree of dimming.

For example, the power monitoring circuit 30 makes the second threshold when detecting the recovery of the power supply voltage of the power supply 2 different from the first threshold when detecting the decrease of the power supply voltage of the power supply 2 . The power monitoring circuit 30, for example, makes the second threshold larger than the first threshold. As a result, after the control unit 24 resumes control of the operation of the power conversion circuit 22 in response to the detection of the recovery of the power supply voltage of the power supply 2, the drop in the power supply voltage of the power supply 2 is immediately detected, and the control unit 24 stops controlling the operation of the power conversion circuit 22 . However, the second threshold may be the same as the first threshold.

As described above, in the lighting fixture 10 and the lighting device 14 according to the present embodiment, the control unit 24 may stop operating due to a drop in the power supply voltage of the power supply 2, or the control unit 24 may stop abnormally due to a sudden voltage fluctuation. Before entering the state, the dimming signal input circuit 28 and the power monitoring circuit 30 output a dimming signal for setting the dimming degree to 0% in response to detection of a drop in the power supply voltage of the power supply 2. By inputting to the input unit 24 a of the control unit 24 , the control unit 24 stops controlling the operation of the power conversion circuit 22 . As a result, it is possible to prevent the control unit 24 from entering an abnormal stopped state even when a sudden voltage fluctuation occurs.

Then, in the lighting fixture 10 and the lighting device 14 according to the present embodiment, the dimming signal input circuit 28 and the power supply monitoring circuit 30 set the dimming level to 0% in response to detection of recovery of the power supply voltage of the power supply 2. The state in which the dimming signal is input to the input section 24 a of the control section 24 is returned to the state in which the dimming signal corresponding to the control signal is input to the input section 24 a of the control section 24 . As a result, even when the power supply voltage of the power supply 2 rises slowly, it is possible to prevent the control unit 24 from stopping immediately after starting.

The power monitoring circuit 30 makes the second threshold greater than the first threshold. As a result, even when the power supply voltage of the power supply 2 rises slowly, it is possible to more reliably prevent the control unit 24 from stopping immediately after starting.

Furthermore, in the lighting fixture 10 and the lighting device 14 according to the present embodiment, the dimming signal input circuit 28 and the power supply monitoring circuit 30 set the dimming level to 0% when detecting a drop in the power supply voltage of the power supply 2. By inputting the dimming signal to the input section 24 a of the control section 24 , the control section 24 stops controlling the operation of the power conversion circuit 22 .

Accordingly, in the lighting device 10 and the lighting device 14 according to the present embodiment, it is possible to stop the control of the operation of the power conversion circuit 22 by the control section 24 only by inputting the dimming signal. Therefore, compared to the case where the signal from the power supply monitoring circuit 30 and the dimming signal are input to the control section 24, it is possible to prevent the configuration of the control section 24 from becoming complicated. For example, even with the control unit 24 having only one input unit 24a, it is possible to achieve both the power supply monitoring function and the dimming function.

As described above, in the lighting fixture 10 and the lighting device 14 according to the present embodiment, it is possible to achieve both the power supply monitoring function and the light control function with a simpler configuration.

FIG. 2 is a block diagram schematically showing a modification of the lighting fixture and the lighting device according to the first embodiment.
As shown in FIG. 2 , in the lighting fixture 10 a , the power monitoring circuit 30 a of the lighting device 14 a has an operation section 32 . It should be noted that the same reference numerals are given to the parts that are substantially the same as those of the above-described embodiment in terms of function and configuration, and detailed description thereof will be omitted.

The operation unit 32 receives an operation from a user or the like, and inputs setting information for changing the values of the first threshold value and the second threshold value according to the operation to the power supply monitoring circuit 30a. For example, a changeover type switch, a variable resistor, or the like is used for the operation unit 32 . The operation unit 32 may be any member capable of inputting setting information for changing the values of the first threshold value and the second threshold value to the power supply monitoring circuit 30a according to the operation. The setting information is, for example, digital information corresponding to switching of a switch, analog information of a voltage that changes according to operation of a variable resistor, or the like. The setting information may be arbitrary information that allows the power supply monitoring circuit 30a to appropriately recognize the values of the first threshold and the second threshold.

The power monitoring circuit 30a receives setting information input from the operation unit 32, and changes the values of the first threshold value and the second threshold value according to the input setting information. In this manner, the power supply monitoring circuit 30a can arbitrarily set the values of the first threshold value and the second threshold value according to the input setting information.

For example, the values of the first threshold and the second threshold are arbitrarily changed according to the power supply environment. As a result, it is possible to more appropriately prevent the control unit 24 from entering an abnormal stop state and the control unit 24 from stopping immediately after being started.

The setting information may be input to the power monitoring circuit 30a from, for example, the external device 4 without being limited to the operation unit 32. FIG. Communication between the external device 4 and the power supply monitoring circuit 30a may be wired or wireless. For example, when the external device 4 is a mobile terminal such as a smartphone, a control signal for dimming and setting information for setting a threshold value may be input from one external device 4 to the lighting device 14a. . For example, when the external device 4 is a wall-mounted switch or the like, the external device 4 is for inputting a control signal for dimming, and the external device 4 is for inputting setting information for setting a threshold value. and may be provided separately.

Also, the power supply monitoring circuit 30a does not necessarily have to be configured to change both the values of the first threshold and the second threshold. The power monitoring circuit 30a may be configured to change only one of the first threshold value and the second threshold value according to the setting information. The power monitoring circuit 30a may be configured to receive input of setting information and change at least one of the first threshold value and the second threshold value according to the input setting information.

(Second embodiment)
FIG. 3 is a block diagram schematically showing a lighting fixture and a lighting device according to the second embodiment.
As shown in FIG. 3, in the lighting device 14b of the lighting fixture 10b, only the dimming signal input circuit 28b is connected to the input section 24a of the control section 24. As shown in FIG. The dimming signal input circuit 28b inputs to the input section 24a of the control section 24 a dimming signal representing the degree of dimming of the light source section 12 according to the input control signal, as in the above embodiment.

In the lighting device 14b, the power monitoring circuit 30b is connected to the dimming signal input circuit 28b. When the power monitoring circuit 30b detects a drop in the power supply voltage of the power supply 2, it inputs a detection signal to the dimming signal input circuit 28b. After detecting a drop in the power supply voltage of the power supply 2, the power supply monitoring circuit 30b stops inputting the detection signal to the dimming signal input circuit 28b when detecting recovery of the power supply voltage of the power supply 2. FIG.

The dimming signal input circuit 28b inputs a dimming signal having a dimming degree corresponding to the control signal to the input section 24a of the control section 24 when no detection signal is input from the power monitoring circuit 30b. As a result, as in the first embodiment, in a normal state in which a drop in the power supply voltage of the power supply 2 is not detected, the control unit 24 outputs a dimming signal corresponding to the dimming level set in the external device 4. , and the light source unit 12 lights up with brightness corresponding to the dimming degree set by the external device 4 .

Then, the dimming signal input circuit 28b sets the dimming signal input to the input section 24a of the control section 24 to a dimming level of 0% while receiving the input of the detection signal from the power monitoring circuit 30b. This makes it possible to cause the control unit 24 to stop controlling the operation of the power conversion circuit 22 as in the first embodiment. For example, even when a sudden voltage fluctuation occurs, it is possible to prevent the control unit 24 from entering an abnormal stopped state.

In this way, when the power monitoring circuit 30b is connected to the dimming signal input circuit 28b and only the dimming signal input circuit 28b is connected to the input section 24a of the control section 24, the same operation as in the first embodiment is performed. When the power supply monitoring circuit 30b detects a drop in the power supply voltage of the power supply 2, the power supply monitoring circuit 30b inputs a detection signal to the dimming signal input circuit 28b, thereby generating a dimming signal for setting the dimming degree to 0%. is input to the input unit 24 a of the control unit 24 to stop the control of the operation of the power conversion circuit 22 by the control unit 24 . Then, when the power supply monitoring circuit 30b detects recovery of the power supply voltage of the power supply 2, the input of the detection signal from the power supply monitoring circuit 30b to the dimming signal input circuit 28b is stopped, thereby setting the dimming degree to 0%. The state in which the dimming signal corresponding to the control signal is input to the input section 24 a of the control section 24 can be returned to the state in which the dimming signal corresponding to the control signal is input to the input section 24 a of the control section 24 .

Also in the lighting fixture 10b and the lighting device 14b according to the present embodiment, the control of the operation of the power conversion circuit 22 by the control unit 24 can be stopped only by inputting the dimming signal, as in the first embodiment. can. Therefore, compared to the case where the signal from the power supply monitoring circuit 30b and the dimming signal are input to the control section 24, it is possible to prevent the configuration of the control section 24 from becoming complicated. For example, even with the control unit 24 having only one input unit 24a, it is possible to achieve both the power supply monitoring function and the dimming function.

Also in the power supply monitoring circuit 30b, the first threshold and the second threshold can be set in the same manner as in the first embodiment. For example, in the power supply monitoring circuit 30b as well, the second threshold can be set higher than the first threshold. Further, for example, by providing the operation unit 32 or the like in the power supply monitoring circuit 30b, at least one of the first threshold value and the second threshold value can be arbitrarily set in the power supply monitoring circuit 30b according to the setting information. can be

The configurations of the dimming signal input circuit and the power supply monitoring circuit are not limited to those described above. 24, the control unit 24 can be made to stop controlling the operation of the power conversion circuit 22, and when the power supply monitoring circuit detects recovery of the power supply voltage of the power supply 2, the dimming degree is set to 0% to the input unit 24a of the control unit 24, can be returned to the state of inputting a dimming signal corresponding to the control signal to the input unit 24a of the control unit 24 configuration is fine.

While several embodiments of the invention have been described, these embodiments have been 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, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and equivalents thereof.

DESCRIPTION OF SYMBOLS 2... Power supply 4... External equipment 10, 10a, 10b... Lighting equipment 12... Light source part 14, 14a, 14b... Lighting device 20... Rectifier circuit 22... Power conversion circuit 24... Control part 26... Control power supply generation circuit 28, 28b... dimming signal input circuit 30, 30a, 30b... power supply monitoring circuit 32... operation unit

Claims (7)

a light source unit having a light source;
a lighting device that converts power supplied from a power source into DC power corresponding to the light source and supplies the DC power to the light source to light the light source;
with
The lighting device
a power conversion circuit that converts the power supplied from the power source into the DC power corresponding to the light source and supplies the DC power to the light source;
a control unit that controls the operation of power conversion by the power conversion circuit;
a dimming signal input circuit that receives an input of a control signal representing the dimming degree of the light source unit and inputs to the control unit a dimming signal representing the dimming degree of the light source unit according to the control signal;
a power supply monitoring circuit that detects a drop in the power supply voltage of the power supply;
has
The control unit has an input unit for receiving an input of the dimming signal, and operates power conversion by the power conversion circuit according to the dimming signal input from the dimming signal input circuit. By controlling, DC power having a magnitude corresponding to the degree of dimming indicated by the dimming signal is supplied from the power conversion circuit to the light source unit, and the light source unit is lit with brightness corresponding to the degree of dimming;
The dimming signal input circuit and the power supply monitoring circuit output the dimming signal for setting the dimming level to 0% from the control unit when the power supply monitoring circuit detects a drop in the power supply voltage of the power supply. By inputting to the input unit, the control unit stops controlling the operation of the power conversion circuit, and when the power supply monitoring circuit detects the recovery of the power supply voltage of the power supply, the dimming level is set to 0% A lighting fixture that returns from a state in which the dimming signal to be set is input to the input section of the control section to a state in which the dimming signal corresponding to the control signal is input to the input section of the control section. The power supply monitoring circuit is connected to the input section of the control section together with the dimming signal input circuit, and in a state in which a drop in the power supply voltage of the power supply is not detected, the output from the dimming signal input circuit The state of the dimming signal output from the dimming signal input circuit in a state in which the dimming signal corresponding to the control signal is input to the input section of the control section and a drop in the power supply voltage of the power supply is detected. 2. The lighting fixture according to claim 1, wherein the dimming signal input to the input section of the control section is set to a dimming degree of 0% regardless of the lighting. The power monitoring circuit is connected to the dimming signal input circuit,
The dimming signal input circuit is connected to the input section of the control section,
The power supply monitoring circuit inputs a detection signal to the dimming signal input circuit when detecting a drop in the power supply voltage of the power supply, and detects the power supply voltage of the power supply after detecting a drop in the power supply voltage of the power supply. When the recovery of is detected, the input of the detection signal to the dimming signal input circuit is stopped,
The dimming signal input circuit inputs the dimming signal having a dimming degree corresponding to the control signal to the input unit of the control unit in a state where the detection signal is not input from the power supply monitoring circuit, 2. The lighting fixture according to claim 1, wherein the dimming signal input to the input section of the control section is set to a dimming level of 0% when the detection signal is input from the power monitoring circuit. The power supply monitoring circuit detects a drop in the power supply voltage of the power supply when the voltage related to the power supply voltage of the power supply becomes equal to or less than a first threshold, and detects the voltage related to the power supply voltage of the power supply exceeding the first threshold. The lighting fixture according to any one of claims 1 to 3, wherein recovery of the power supply voltage of the power supply is detected when the voltage becomes equal to or greater than a second threshold after becoming equal to or less than the threshold. 5. A lighting fixture according to claim 4, wherein said second threshold is different than said first threshold. 6. The lighting fixture according to claim 4, wherein the power supply monitoring circuit receives input of setting information and changes at least one of the first threshold value and the second threshold value according to the input setting information. A lighting device that converts power supplied from a power source into DC power corresponding to a light source and supplies the DC power to the light source to light the light source,
a power conversion circuit that converts the power supplied from the power source into the DC power corresponding to the light source and supplies the DC power to the light source;
a control unit that controls the operation of power conversion by the power conversion circuit;
a dimming signal input circuit that receives an input of a control signal representing the dimming degree of the light source unit and inputs to the control unit a dimming signal representing the dimming degree of the light source unit according to the control signal;
a power supply monitoring circuit that detects a drop in the power supply voltage of the power supply;
with
The control unit has an input unit for receiving an input of the dimming signal, and operates power conversion by the power conversion circuit according to the dimming signal input from the dimming signal input circuit. By controlling, DC power having a magnitude corresponding to the degree of dimming indicated by the dimming signal is supplied from the power conversion circuit to the light source unit, and the light source unit is lit with brightness corresponding to the degree of dimming;
The dimming signal input circuit and the power supply monitoring circuit output the dimming signal for setting the dimming degree to 0% from the control unit when the power supply monitoring circuit detects a drop in the power supply voltage of the power supply. By inputting to the input unit, the control unit stops controlling the operation of the power conversion circuit, and when the power supply monitoring circuit detects the recovery of the power supply voltage of the power supply, the dimming level is set to 0% A lighting device that returns from a state in which the dimming signal to be set is input to the input section of the control section to a state in which the dimming signal corresponding to the control signal is input to the input section of the control section.

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