JP2022018884A - Lighting fixture, connection unit, and lighting device - Google Patents

Abstract

To obtain a lighting fixture, a connection unit, and a lighting device that can switch the presence or absence of a ripple suppression function.SOLUTION: A lighting fixture according to the present disclosure includes a lighting device, a light source module, and a connection unit. The lighting device includes a lighting circuit that outputs power from a pair of output terminals to turn on a light source, and a control circuit that controls the lighting circuit such that a feedback value input from a feedback terminal matches a reference value. The light source module includes a first light source terminal connected to one of a pair of output terminals, a second light source terminal, and the light source connected between the first light source terminal and the second light source terminal. The connection unit includes a first connection terminal that is connected to the feedback terminal and outputs the feedback value, a second connection terminal connected to the other of the pair of output terminals, and a current detection unit connected in series with the light source via the second light source terminal.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to luminaires, connection units and lighting devices.

Patent Document 1 discloses an LED drive device that converts AC input power into DC output power and supplies it to an LED load. This LED drive device includes a switching element that is controlled to be turned on and off, a ripple current reducing unit that is connected in series with the LED load and reduces the current ripple flowing through the LED load, and a control circuit. The control circuit controls the DC output power to a predetermined value by controlling the switching element on and off based on the feedback voltage at the connection point between the LED load and the ripple current reducing unit. The ripple current reducing unit has a feedback type constant current control circuit that variably controls the impedance.

Japanese Patent No. 5110197

In the LED drive device shown in Patent Document 1, the manufacturing cost may increase by adding the ripple current reducing unit. In addition, a loss may occur due to the product of the ripple voltage and the current flowing through the light source, which may reduce the circuit efficiency. Further, when the LED drive device is installed in an environment in which the ripple countermeasure function is preliminarily incorporated, there is a possibility that the ripple current reduction unit becomes unnecessary.

The present disclosure has been made to solve the above-mentioned problems, and an object of the present invention is to obtain a luminaire, a connection unit, and a lighting device capable of switching the presence or absence of a ripple suppression function.

The lighting fixture according to the present disclosure includes a lighting device, a light source module, and a connection unit, and the lighting device generates power by turning on / off a pair of output terminals, a feedback terminal, and a first switching element. The first switching so that the lighting circuit that outputs the power from the pair of output terminals to turn on the light source, the feedback value input from the feedback terminals, and the predetermined first reference value match. The light source module includes a first light source terminal for controlling on / off of the element, the first light source terminal connected to one of the pair of output terminals, the second light source terminal, and the first light source terminal. The light source is connected between the second light source terminal, and the connection unit is connected to the feedback terminal and outputs the feedback value to the first connection terminal and the other of the pair of output terminals. A second connection terminal connected to the light source and a current detection unit connected in series with the light source via the second light source terminal are provided.

The connection unit according to the present disclosure includes a current detection unit, a switching element connected in series with the current detection unit, and the switching element so that the detection value of the current detection unit matches a predetermined reference value. A control circuit that controls on / off, a first connection terminal that outputs a feedback value used for feedback control in the lighting device, a second connection terminal that is connected to the output terminal of the lighting device, the current detector, and the current detector. It includes a third connection terminal that supplies a current to the series circuit formed by the switching element, and a fourth connection terminal that supplies power to the control circuit.

The lighting device according to the present disclosure includes a pair of output terminals, a feedback terminal, a lighting circuit that generates electric power by turning on / off a switching element, and outputs the electric power from the pair of output terminals to light a light source, and the feedback. A control circuit for controlling on / off of the switching element is provided so that the feedback value input from the terminal and the predetermined reference value match.

In the luminaire according to the present disclosure, the presence / absence of the ripple suppression function can be switched depending on the type of the connection unit.

In the connection unit according to the present disclosure, the presence / absence of the ripple suppression function can be switched by connecting the connection unit to the lighting device.

In the lighting device according to the present disclosure, the presence / absence of the ripple suppression function can be switched depending on the type of the connection unit connected to the lighting device.

It is a circuit block diagram of the luminaire which does not have a ripple suppression function which concerns on Embodiment 1. FIG. FIG. 3 is a circuit block diagram of a lighting fixture having a ripple suppressing function according to the first embodiment. It is a circuit block diagram of the lighting fixture which concerns on Embodiment 2. FIG.

The lighting fixture, the connection unit, and the lighting device according to each embodiment will be described with reference to the drawings. The same or corresponding components may be designated by the same reference numerals and the description may be omitted. In addition, when referring to the connection below, it shall include an electrical connection.

Embodiment 1.
FIG. 1 is a circuit block diagram of a lighting fixture 100 having no ripple suppressing function according to the first embodiment. The luminaire 100 includes a lighting device 1, a light source module 90, and a connection unit 50.

The light source module 90 includes a first light source terminal 91, a second light source terminal 92, and a plurality of light sources 93. The plurality of light sources 93 are connected between the first light source terminal 91 and the second light source terminal 92. The light source 93 is a light emitting element such as an LED. A plurality of light sources 93 are connected in series. The plurality of light sources 93 may be connected in parallel or in series and parallel. Further, the light source module 90 may include at least one light source 93.

The connection unit 50 includes a first connection terminal 71, a second connection terminal 72, and a current detection unit 51 connected between the first connection terminal 71 and the second connection terminal 72. The current detection unit 51 of the present embodiment is an LED current detection resistor. The current detection unit 51 is not limited to the resistance element, and may detect the current flowing through the light source module 90.

The lighting device 1 includes a pair of input terminals 81 and 82, a pair of output terminals 31 and 32, and a feedback terminal 33 as connection points with the outside. Further, the lighting device 1 includes a rectifier circuit 8, a capacitor 9, a flyback circuit 10, a snubber circuit 20, a control circuit 40, capacitors 42, 43, 44 and an electrolytic capacitor 13.

In the lighting device 1, the AC power supply 7 is connected to the rectifier circuit 8 via the input terminals 81 and 82. The AC power supply 7 is also called a commercial power supply. A capacitor 9 is connected between the output terminals of the rectifier circuit 8.

The flyback circuit 10 is composed of a transformer 11, a diode 12, and a switching element Q1. The flyback circuit 10 converts the pulsating current voltage supplied from the rectifier circuit 8 into a DC voltage by a switching operation. The flyback circuit 10 is a lighting circuit that generates electric power by turning on / off the switching element Q1 and outputs this electric power from the pair of output terminals 31 and 32 to light the light source 93.

The switching element Q1 is, for example, a MOSFET (Metal-Oxide-Semiconductor Field-Effective Transistor). The switching element Q1 has a first terminal, a second terminal, and a control terminal. When the switching element Q1 is a MOSFET, the first terminal is a drain terminal, the second terminal is a source terminal, and the control terminal is a gate terminal. The control terminal is a terminal for switching between the first and second terminals. The first terminal of the switching element Q1 is connected to the anode of the diode 23. The second terminal of the switching element Q1 is connected to the negative electrode of the capacitor 9. The control terminal of the switching element Q1 is connected to the control circuit 40.

One end of the primary side of the transformer 11 is connected to the positive electrode of the capacitor 9. The other end of the primary side of the transformer 11 is connected to the first terminal of the switching element Q1. One end of the secondary side of the transformer 11 is connected to the anode of the diode 12. The cathode of the diode 12 is connected to the output terminal 31. An electrolytic capacitor 13 is connected between the other end of the secondary side of the transformer 11 and the cathode of the diode 12. The electrolytic capacitor 13 smoothes the output of the flyback circuit.

A snubber circuit 20 is connected to the capacitor 9. The snubber circuit 20 is composed of a resistor 21, a capacitor 22, and a diode 23. One end of the resistor 21 and the positive electrode of the capacitor 22 are connected to the positive electrode of the capacitor 9. The other end of the resistor 21 and the negative electrode of the capacitor 22 are connected to the cathode of the diode 23. In the flyback circuit 10, when converting the pulsating voltage into a DC voltage, energy that is not transmitted to the secondary side of the transformer 11 due to the influence of the leakage inductance of the transformer 11 is generated as a kickback voltage across the switching element Q1. do. The snubber circuit 20 suppresses this kickback voltage.

The output terminal 31 of the lighting device 1 is connected to the first light source terminal 91. That is, the output terminal 31 is connected to the anode side of the light source module 90. The second light source terminal 92 provided on the cathode side of the light source module 90 is connected to the first connection terminal 71 of the connection unit 50 and the feedback terminal 33 of the lighting device 1. The current detection unit 51 is connected in series with the light source 93 via the second light source terminal 92. The second connection terminal 72 of the connection unit 50 is connected to the output terminal 32 of the lighting device 1. The output terminal 32 is connected to the output on the minus side of the flyback circuit 10.

The control circuit 40 includes an error amplifier 41 and a drive circuit 45. The feedback terminal 33 is connected to one input terminal of the error amplifier 41. A capacitor 42 is connected between one input terminal and the output terminal 32 of the error amplifier 41. A capacitor 43 is connected between the other input terminal and the output terminal 32 of the error amplifier 41. A capacitor 44 is connected between the output terminal and the output terminal 32 of the error amplifier 41. Further, a drive circuit 45 is connected to the output terminal of the error amplifier 41. The drive circuit 45 is connected to the control terminal of the switching element Q1. The control circuit 40 controls the on / off of the switching element Q1. The control circuit 40 is formed of, for example, a microcomputer, an integrated circuit, or the like.

The output current of the flyback circuit 10 flows in the order of the output terminal 31, the light source module 90, the current detection unit 51, and the output terminal 32. The current flowing through the light source module 90 is converted into a voltage by the current detection unit 51. The first connection terminal 71 is connected to the feedback terminal 33. The first connection terminal 71 outputs a feedback value to the feedback terminal 33. In the present embodiment, the feedback value is the detection value of the current detection unit 51. That is, the feedback value is the voltage generated in the current detection unit 51.

The control circuit 40 detects the feedback value input from the feedback terminal 33 by the error amplifier 41. The control circuit 40 charges the capacitor 43 by itself. As a result, the control circuit 40 generates a first reference value, which is a reference voltage, at the other input terminal of the error amplifier 41. The error amplifier 41 compares this feedback value with the first reference value, and performs a switching operation via the drive circuit 45 so that the error becomes zero. In this way, the control circuit 40 controls the on / off of the switching element Q1 so that the feedback value and the predetermined first reference value match. Therefore, the flyback circuit 10 is controlled by a constant current.

The capacitor 44 is provided for phase compensation. Thereby, the feedback control can be performed so that the feedback cycle is equal to or less than the cycle of the AC power supply 7.

In the present embodiment, the flyback circuit 10 generates a DC voltage by the power factor improving operation. Therefore, the ripple voltage derived from the commercial power supply is superimposed between the output terminals 31 and 32 of the flyback circuit 10. That is, a ripple voltage is superimposed on both ends of the light source module 90 and the current detection unit 51. Therefore, the current flowing through the light source 93 is a current accompanied by ripple. This ripple current changes depending on the capacity of the electrolytic capacitor 13. However, in order to make the ripple voltage zero, a large-capacity electrolytic capacitor 13 is generally required. Therefore, it is difficult to sufficiently remove the ripple by the electrolytic capacitor 13.

FIG. 2 is a circuit block diagram of a lighting fixture 200 having a ripple suppressing function according to the first embodiment. The luminaire 200 is obtained by replacing the connection unit 50 of the luminaire 100 with the connection unit 250. In the luminaire 100 and the luminaire 200, the same lighting device 1 and the light source module 90 are used.

The connection unit 250 includes a switching element Q2, a current detection unit 52, a control circuit 53, resistors 55 and 56, and a capacitor 57. The current detection unit 52 is an LED current detection resistor. The current detection unit 52 is not limited to the resistance element, and may detect the current flowing through the switching element Q2. The switching element Q2 is, for example, a MOSFET.

The connection unit 250 includes a first connection terminal 71, a second connection terminal 72, a third connection terminal 73, and a fourth connection terminal. The first connection terminal 71 is connected to the feedback terminal 33. The second connection terminal 72 is connected to the output terminal 32. The third connection terminal 73 is connected to the second light source terminal 92. The fourth connection terminal 74 is connected to the output terminal 31 and the first light source terminal 91. Further, the fourth connection terminal 74 is connected to the Vcc terminal of the control circuit 53. The fourth connection terminal 74 is supplied with power for the control circuit 53 from the lighting device 1.

The switching element Q2 and the current detection unit 52 are connected in series to form a series circuit. The first terminal of the switching element Q2 is connected to the cathode side of the light source module 90 via the third connection terminal 73. In this way, the third connection terminal 73 supplies a current to the series circuit formed by the current detection unit 52 and the switching element Q2. One end of the current detection unit 52 is connected to the second terminal of the switching element Q2. The other end of the current detection unit 52 is connected to the second connection terminal 72. A series circuit of resistors 55 and 56 is connected in parallel with the series circuit formed by the switching element Q2 and the current detection unit 52. The first connection terminal 71 is connected to the connection points of the resistors 55 and 56.

The resistors 55 and 56 form a voltage divider circuit. The connection points of the resistors 55 and 56 are connected to the feedback terminal 33 via the first connection terminal 71. The first connection terminal 71 outputs a feedback value used for feedback control in the lighting device 1. The first connection terminal 71 outputs a voltage corresponding to the voltage across the series circuit formed by the current detection unit 52 and the switching element Q2 to the feedback terminal 33 as a feedback value. That is, the resistors 55 and 56 divide the drain voltage of the switching element Q2 and input it to the feedback terminal 33. Therefore, the flyback circuit 10 operates at a constant voltage so that the drain voltage of the switching element Q2 becomes constant.

The control circuit 53 has an error amplifier 54. The second terminal of the switching element Q2 is connected to one input terminal of the error amplifier 54. A capacitor 57 is connected between the other input terminal of the error amplifier 54 and the second connection terminal 72. A control terminal of the switching element Q2 is connected to the output terminal of the error amplifier 54. The control circuit 53 generates the second reference value by charging the capacitor 57 by itself.

The control circuit 53 controls the on / off of the switching element Q2 so that the detection value of the current detection unit 52 matches the predetermined second reference value. That is, the error amplifier 54 adjusts the voltage applied to the control terminal of the switching element Q2 so that the current flowing through the current detection unit 52 becomes the same as a predetermined value. As a result, the control circuit 53 operates the switching element Q2 in the active region and adjusts the impedance to perform constant current control.

A ripple voltage is applied to both ends of the series circuit formed by the light source module 90, the switching element Q2, and the current detection unit 52 for the power factor improving operation of the flyback circuit 10. Here, the connection unit 250 controls the impedance of the switching element Q2. Due to the impedance control of the connection unit 250, the voltage applied to both ends of the light source module 90 becomes constant, and the current flowing through the light source module 90 becomes constant. That is, since the switching element Q2 is in charge of the ripple voltage, the voltage applied to the light source module 90 becomes constant, and the ripple of the LED current is suppressed. Therefore, the ripple current can be suppressed.

From the above, in the present embodiment, the lighting device 1 and the light source module 90 are shared, and the presence or absence of the ripple suppression function can be switched by selecting the connection units 50 and 250. The luminaire 100 in which the connection unit 50 is used is not provided with the ripple suppression function. The luminaire 200 in which the connection unit 250 is used is provided with a ripple suppression function.

Since the luminaire 100 in which the connection unit 50 is used is not provided with the ripple suppression function, it is possible to suppress a decrease in circuit efficiency due to loss due to ripple suppression. This loss corresponds to the product of the ripple voltage and the LED current. Therefore, it is possible to realize a highly efficient and low cost lighting fixture 100. In an environment where equipment affected by lighting such as a surveillance camera is used, a ripple suppression function may be incorporated in advance. In such an environment, the connection unit 50 can be particularly selected.

In the present embodiment, the presence / absence of the ripple suppression function can be switched depending on the type of the connection unit. Therefore, it is not necessary to provide the lighting device with a switching mechanism for the ripple suppression function, and the lighting device 1 can be manufactured at low cost. Further, in the lighting fixtures 100 and 200 of the present embodiment, the lighting device 1 and the light source module 90 can be shared. Therefore, it is not necessary to develop a plurality of lighting devices 1 depending on the presence or absence of the ripple suppression function, and the number of models can be suppressed. Therefore, the development cost can be suppressed.

Further, the output current of the lighting device 1 can be adjusted by adjusting the constants of the parts of the connection units 50 and 250. In the constant adjustment, for example, the resistance value of the resistance of the connection units 50 and 250 is adjusted. As a result, it is not necessary to classify the lighting device 1 according to the magnitude of the output current. Therefore, the lighting device 1 and the light source module 90 can be further standardized.

Further, the lighting device 1 of the present embodiment includes output terminals 31, 32 and a feedback terminal 33. By preparing these terminals in the lighting device 1, it is possible to switch the presence or absence of the ripple suppression function depending on the type of the connection unit connected to the lighting device 1. Further, the control or output power of the lighting device 1 can be switched depending on the type of the connection unit.

Further, the output terminals 31, 32, the feedback terminal 33, the first light source terminal 91, and the second light source terminal 92 have a structure that can be connected to and disconnected from other terminals. Further, the first connection terminal 71, the second connection terminal 72, the third connection terminal 73, and the fourth connection terminal 74 also have a structure that can be connected to and disconnected from other terminals. As a result, the connection unit 50 is detachably provided to the lighting device 1 and the light source module 90 by the first connection terminal 71 and the second connection terminal 72. Similarly, the connection unit 250 is detachably provided to the lighting device 1 and the light source module 90 by the first connection terminal 71, the second connection terminal 72, the third connection terminal 73, and the fourth connection terminal 74. Therefore, the presence or absence of the ripple suppression function can be easily switched.

In FIG. 1, the second light source terminal 92 is connected to the wiring connecting the feedback terminal 33 and the first connection terminal 71. As a modification of this, the connection unit 50 may further have a connection terminal for connecting the second light source terminal 92 and the current detection unit 51.

In this embodiment, the lighting circuit is a flyback circuit. The lighting circuit may be another switching circuit such as a back boost circuit or a back converter circuit as long as it is a circuit that converts pulsating current to direct current.

Further, the connection unit is not limited to that shown in FIGS. 1 and 2. The connection unit may be used in other circuits as long as it can supply a current to the light source module 90 and function as lighting by being connected to the lighting device 1 and the light source module 90.

Further, when connected to the connection unit 50, the lighting device 1 operates at a constant current, and when connected to the connection unit 250, the lighting device 1 operates at a constant voltage. Not limited to this, the lighting device 1 may operate at a constant current when connected to the connection unit 250. That is, the LED current value may be fed back from the first connection terminal 71 to the feedback terminal 33.

These modifications can be appropriately applied to the luminaire, the connection unit and the lighting device according to the following embodiments. Since the lighting fixture, the connection unit, and the lighting device according to the following embodiments have much in common with the first embodiment, the differences from the first embodiment will be mainly described.

Embodiment 2.
FIG. 3 is a circuit block diagram of the lighting fixture 300 according to the second embodiment. The luminaire 300 of the present embodiment has a different configuration of the connection unit 350 from the luminaires 100 and 200. The lighting device 1 and the light source module 90 are the same as those in the first embodiment.

The connection unit 350 further includes a regulator circuit 58, voltage dividing resistors 59 and 60, a switching element Q3, and a dimming IF (Interface) circuit 62 in addition to the configuration of the connection unit 250. The regulator circuit 58 is supplied with electric power from the lighting device 1 via the fourth connection terminal 74 to generate a constant voltage. A series circuit of voltage dividing resistors 59 and 60 is connected between the regulator circuit 58 and the second connection terminal 72. The first terminal of the switching element Q3 and the error amplifier 54 are connected to the connection points of the voltage dividing resistors 59 and 60. The second terminal of the switching element Q3 is connected to the second connection terminal 72. The control terminal of the switching element Q3 is connected to the dimming IF circuit 62. The control terminal of the switching element Q3 is a terminal for switching between the first and second terminals.

The second reference value is input to the error amplifier 54 by the voltage dividing resistors 59 and 60. A dimming signal is input from the external dimmer 63. The connection unit 350 may include a dimming terminal 75 for receiving a dimming signal. The dimming signal is detected by the dimming IF circuit 62. The dimming IF circuit 62 emits a PWM (Pulse Width Modulation) signal having a predetermined duty according to the dimming signal. The switching element Q3 is turned on and off according to the PWM signal. As a result, the second reference value is adjusted to a value corresponding to the dimming signal. Therefore, the LED current can be controlled to a value corresponding to the dimming signal. In this way, the second reference value may be changed according to the signal from the outside.

The technical features described in each embodiment may be used in combination as appropriate.

1 lighting device, 7 AC power supply, 8 rectifier circuit, 9 capacitor, 10 flyback circuit, 11 transformer, 12 diode, 13 electrolytic capacitor, 20 snubber circuit, 21 resistor, 22 capacitor, 23 capacitor, 31 output terminal, 32 output terminal , 33 feedback terminal, 40 control circuit, 41 error amplifier, 42 capacitor, 43, 44 capacitor, 45 drive circuit, 50 connection unit, 51 current detector, 52 current detector, 53 control circuit, 54 error amplifier, 55, 56 Resistance, 57 capacitor, 58 regulator circuit, 59, 60 division resistance, 62 dimming IF circuit, 63 dimmer, 71 1st connection terminal, 72 2nd connection terminal, 73 3rd connection terminal, 74 4th connection terminal , 75 Dimming terminal, 81, 82 input terminal, 90 light source module, 91 1st light source terminal, 92 2nd light source terminal, 93 light source, 100, 200 lighting equipment, 250 connection unit, 300 lighting equipment, 350 connection unit, Q1 , Q2, Q3 switching element

Claims (12)

It is equipped with a lighting device, a light source module, and a connection unit.
The lighting device is
A pair of output terminals and
With feedback terminal,
A lighting circuit that generates electric power by turning on and off the first switching element and outputs the electric power from the pair of output terminals to turn on the light source.
A first control circuit that controls on / off of the first switching element so that the feedback value input from the feedback terminal and the predetermined first reference value match.
Equipped with
The light source module is
A first light source terminal connected to one of the pair of output terminals,
With the second light source terminal
The light source connected between the first light source terminal and the second light source terminal,
Equipped with
The connection unit is
A first connection terminal that is connected to the feedback terminal and outputs the feedback value,
A second connection terminal connected to the other of the pair of output terminals,
A current detection unit connected in series with the light source via the second light source terminal,
A lighting fixture characterized by being equipped with. The luminaire according to claim 1, wherein the connection unit is detachably provided with respect to the lighting device and the light source module. The current detection unit is connected between the first connection terminal and the second connection terminal.
The first control circuit is characterized in that the lighting circuit is controlled by a constant current so that the feedback value, which is the detection value of the current detection unit, and the first reference value match. Lighting equipment described in. The connection unit is
A second switching element connected in series with the current detection unit,
A second control circuit that controls the on / off of the second switching element so that the detection value of the current detection unit matches a predetermined second reference value.
The lighting equipment according to claim 1 or 2, wherein the lighting equipment is provided with. The luminaire according to claim 4, wherein the first connection terminal outputs a voltage corresponding to a voltage across a series circuit formed by the current detection unit and the second switching element as the feedback value. .. The luminaire according to claim 4 or 5, wherein the connection unit controls the impedance of the second switching element. The lighting equipment according to any one of claims 4 to 6, wherein the second reference value is changed in response to an external signal. The connection unit is
The third connection terminal connected to the second light source terminal and
A fourth connection terminal to which power for the second control circuit is supplied from the lighting device, and
The lighting equipment according to any one of claims 4 to 7, wherein the lighting fixture is provided with. Current detector and
A switching element connected in series with the current detector,
A control circuit that controls the on / off of the switching element so that the detection value of the current detection unit matches a predetermined reference value.
The first connection terminal that outputs the feedback value used for feedback control in the lighting device,
The second connection terminal connected to the output terminal of the lighting device,
A third connection terminal that supplies a current to the series circuit formed by the current detection unit and the switching element,
The fourth connection terminal to which the power of the control circuit is supplied and
A connection unit characterized by being equipped with. The connection unit according to claim 9, wherein the first connection terminal outputs a voltage corresponding to a voltage across the series circuit as the feedback value. The connection unit according to claim 9 or 10, wherein the reference value is changed in response to an external signal. A pair of output terminals and
With feedback terminal,
A lighting circuit that generates electric power by turning on and off the switching element and outputs the electric power from the pair of output terminals to turn on the light source.
A control circuit that controls the on / off of the switching element so that the feedback value input from the feedback terminal and the predetermined reference value match.
A lighting device characterized by being provided with.

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