JP2018073740A - Lighting unit and lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting unit and lighting fixture, capable of supplying electric power to an external unit without increasing an output of a control power supply circuit provided for voltage supply to a control circuit of a lighting device.SOLUTION: The lighting unit includes: a lighting circuit 18; a first terminal part 40 connected with an output of the lighting circuit 18; a second terminal part 42 connected with the output of the lighting circuit 18; and an external unit 50 connected with the second terminal part 42.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lighting unit that supplies power to a light source unit and a lighting fixture including the lighting unit.

  Patent Document 1 discloses a lighting device that turns on a light source by supplying DC power to a light source module having a light source such as an LED.

Japanese Patent Laid-Open No. 2006-66490

  In some cases, not only the light source but also an external unit is connected to the lighting device. Electric power necessary for controlling the external unit is supplied from the lighting device. In this case, it is conceivable to supply power to the external unit from a control power supply circuit provided in the lighting device in order to provide a control voltage of the lighting device. In order to supply the control voltage of the lighting device and further supply power to the external unit by the control power supply circuit, the output of the control power supply circuit must be increased. In order to increase the output of the control power supply circuit, the size and cost of the control power supply circuit increase.

  SUMMARY An advantage of some aspects of the invention is to provide a lighting unit and a lighting fixture that can supply power to an external unit without increasing the output of a control power supply circuit.

  The lighting unit according to the invention of the present application is connected to the lighting circuit, the first terminal connected to the output of the lighting circuit, the second terminal connected to the output of the lighting circuit, and the second terminal. And an external unit.

  According to the present invention, power is supplied to the external unit using the output voltage of the lighting circuit, so that power can be supplied to the external unit without increasing the output of the control power supply circuit.

It is a circuit diagram of the lighting fixture which concerns on embodiment.

  A lighting unit and a lighting fixture according to an embodiment of the present invention will be described with reference to the drawings. The same or corresponding components are denoted by the same reference numerals, and repeated description may be omitted.

Embodiment.
FIG. 1 is a circuit diagram of a lighting fixture 1 according to an embodiment of the present invention. The lighting fixture 1 includes a lighting device 10, a light source unit 11, and an external unit 50. The lighting device 10 is provided with a first terminal portion 40 and a second terminal portion 42. The light source unit 11 is connected to the first terminal unit 40 and emits light upon receiving a current supply from the lighting device 10. The light source unit 11 is, for example, an LED module composed of a plurality of LEDs connected in series. The external unit 50 is a voice input / output device that is connected to the second terminal portion 42 and enables the lighting device 10 to be controlled by a user's voice. What remove | excluded the light source part 11 from the lighting fixture 1 shown by FIG. 1 is called a lighting unit.

  The lighting device 10 will be described. The lighting device 10 includes a power factor correction circuit 12. The power factor correction circuit 12 includes a rectifier DB that rectifies the commercial AC power supply AC, and a boost chopper circuit that charges the rectified pulsating voltage to a predetermined DC high voltage in the capacitor C1. The step-up chopper circuit has a coil L1 having one end connected to the high potential side of the rectifier DB, a switching element Q1 connected to the other end of the coil L1, and a connection point between the other end of the coil L1 and the drain side of the switching element Q1. It is composed of a diode D1 to which an anode is connected. The switching element Q1 is, for example, a MOSFET having a drain, a source, and a gate.

  When the switching element Q1 is OFF, a current flows to the boost chopper circuit via the diode D1, and at this time, when the switching element Q1 is ON, the energy accumulated in the coil L1 is further released and the capacitor C1 is charged. . The capacitor C1 has a positive electrode connected to the cathode of the diode D1, and a negative electrode connected to the low voltage side of the rectifier DB. The capacitor C1 is an electrolytic capacitor, for example. The voltage across the capacitor C1 is connected in series, is divided by the resistance elements R1 and R2 used for output voltage detection of the power factor correction circuit 12, and is input to the FB unit 16. The FB unit 16 outputs a switching signal for controlling the switching element Q1 so that the divided voltage becomes constant. This switching signal is applied to the gate of the switching element Q1 via the control circuit unit 14. The step-up chopper circuit is controlled so that the output voltage becomes a constant voltage.

  Since the operating voltage of the FB section 16 is insufficient to drive the switching element Q1, the operating voltage of the FB section 16 cannot be applied to the switching element Q1 as it is. Therefore, after the signal level of the switching signal output from the FB unit 16 is increased by the control circuit unit 14, a signal is supplied to the switching element Q1 to perform stable switching.

  A lighting circuit 18 is connected to the power factor correction circuit 12. The lighting circuit 18 is a buck converter circuit. The lighting circuit 18 includes a switching element Q2, a diode D2, a coil L2, a capacitor C2, and a resistance element R3. The switching element Q2 is, for example, a MOSFET. A series circuit composed of the switching element Q2 and the diode D2 is connected in parallel with the capacitor C1 of the power factor correction circuit 12. The drain of the switching element Q2 is connected to the positive electrode of the capacitor C1, and the source is connected to the cathode of the diode D2.

  The coil L2, the capacitor C2, and the resistance element R3 are connected in this order to form a series circuit. This series circuit is connected in parallel to the diode D2. The DC high voltage charged in the capacitor C1 is smoothed by the capacitor C2 and supplied to the first terminal unit 40 via the buck converter circuit including the switching element Q2, the coil L2, and the diode D2. The first terminal unit 40 is connected to the output of the lighting circuit 18. The voltage supplied to the first terminal unit 40 is supplied to the light source unit 11 connected to the first terminal unit 40, and the LED is lit.

  The lighting device 10 lights the light source unit 11 with constant current control. The microcomputer 24 outputs a target value of the output current, and is input to the FB unit 28 via the dimming command unit 26. The current flowing through the LED is converted into a voltage by the resistance element R3 and input to the FB unit 28. The FB unit 28 compares the output current target value input via the dimming command unit 26 with the voltage of the resistance element R3, and controls the switching element Q2 so that the voltage of the resistance element R3 becomes equal to the output current target value. Output a switching signal. This switching signal is supplied to the switching element Q2 after the signal level is increased by the control circuit unit 22 in the same manner as the switching element Q1 of the step-up chopper circuit. The switching element Q2 is controlled so that the output current of the lighting circuit 18 becomes a constant current.

  The control power supply circuit 20 is connected to the anode of the capacitor C <b> 1 through the high voltage line 13 and to the control voltage line 15. The control power supply circuit 20 provides a voltage to the IC group based on the electric charge stored in the capacitor C1. Specifically, the control power supply circuit 20 supplies control voltages of, for example, the FB units 16 and 28, the microcomputer 24, the I / F circuit 30, and the control circuit units 14 and 22. For example, the control power supply circuit 20 accumulates electric charge in a capacitor connecting the control voltage line 15 and the GND line 17 based on the electric charge from the capacitor C1, and generates a voltage of about 15V. A voltage may be generated by another method based on the charge of the capacitor C1. Further, a voltage of about 15V in the control voltage line 15 is stepped down to generate a voltage of about 5V. For example, a voltage of about 15V is supplied to the control circuit unit 14, and a voltage of about 5V is supplied to the microcomputer 24. It is good also as a form to do.

  Since various types of microcomputers provided as digital power supply control devices are already known, these known microcomputers can be appropriately used for the microcomputer 24. Further, the microcomputer 24 can be configured by an arithmetic device such as a DSP (Digital Signal Processor). The power supply of the microcomputer 24 is input from the control power supply circuit 20.

  The microcomputer 24 includes, for example, two control circuits, a storage unit, an A / D conversion circuit, and a processing device that are connected to each other via an internal bus. The two control circuits output PWM signals for switching the switching elements Q1 and Q2. The storage unit includes, for example, a non-volatile memory and stores an arithmetic program to be executed by the processing device and various data used for the arithmetic operation. Data is written to and read from the storage unit from the outside. The processing device calculates an on-time or the like in the switching control of the switching elements Q1 and Q2.

  The first diode D3 has a first anode a and a first cathode b. The first anode a is connected to the output of the lighting circuit 18, and the first cathode b is connected to the second terminal portion 42. The output of the lighting circuit 18 and the second terminal portion 42 are connected via the first diode D3.

  The second diode D4 has a second anode c and a second cathode d. The second anode c is connected to the control power circuit 20, and the second cathode d is connected to the second terminal portion 42 and the first cathode b. The second diode D4 is provided on the control voltage line 15. For example, the microcomputer 24, the FB unit 28, and the I / F circuit 30 are connected to the control voltage line 15 between the second anode c and the control power supply circuit 20, and these are supplied with voltage from the control power supply circuit 20.

  An external unit 50 is connected to the second terminal portion 42. The external unit 50 is a voice input / output device. The external unit 50 includes a step-down circuit 50a, a power supply 50b, an audio conversion unit 50c, a control unit 50d, a communication unit 50e, and a speaker 50f. The step-down circuit 50a is a circuit that steps down the voltage of the second terminal unit 42 and generates a predetermined voltage. The power supply 50b is a power supply that supplies the voltage generated by the step-down circuit 50a. The audio conversion unit 50c is a part that converts an audio signal into a digital signal or converts a digital signal into an audio signal.

  The control unit 50d is used to control the speaker 50f. The communication unit 50e is a part used when the external unit 50 performs wireless communication with an external communication device. For example, sound data of music downloaded by a portable terminal is transmitted to the communication unit 50e, and the sound data is converted into an analog signal by the sound conversion unit 50c and sent to the control unit 50d, thereby producing sound from the speaker 50f. it can.

  The second terminal portion 42 is preferably configured by a connector that allows the external unit 50 to be attached to and detached from the lighting device 10. The audio conversion unit 50 c and the I / F circuit 30 are connected via the second terminal unit 42. Thereby, a signal obtained by digitally converting the sound by the sound conversion unit 50 c can be transmitted to the microcomputer 24 via the I / F circuit 30.

  When the user inputs a sound such as “lights off” to the speaker 50f of the external unit 50, the sound is converted from an analog signal to a digital signal by the sound conversion unit 50c via the control unit 50d. The converted digital signal is input to the microcomputer 24 via the I / F circuit 30. The microcomputer 24 determines whether the received digital signal is “off” or “on” from a previously stored table, determines that it is a turn-off command, and sends a signal to the control circuit unit 22 to send the light source unit 11 is turned off.

  When the microcomputer 24 executes the turn-off process, the microcomputer 24 sends a signal to the external unit 50 via the I / F circuit 30 to notify the speaker 50f that the light has been turned off by voice. In addition, sound can be output from the speaker 50f as necessary.

  Operation | movement of the lighting fixture 1 which concerns on embodiment of this invention is demonstrated. First, an operation at the time of lighting in which the light source unit 11 is emitting light will be described. At the time of lighting, the output of the lighting circuit 18 is about 100 to 200V, while the control voltage line 15 is about 15V. Therefore, the first diode D3 is forward-biased, and a voltage of about 100 to 200 V is supplied from the output of the lighting circuit 18 to the second terminal portion 42 via the first diode D3. The step-down circuit 50a of the external unit 50 steps down the voltage of the second terminal portion 42 to obtain, for example, a 5V power supply 50b. The external unit 50 operates by supplying a voltage from the power source 50b to each part in the external unit 50.

  At the time of lighting, since the second diode D4 is reverse-biased, no voltage is supplied from the control power supply circuit 20 to the second terminal unit. Therefore, the control power supply circuit 20 supplies a voltage only to the control circuit used for controlling the lighting circuit 18 such as the microcomputer 24, for example.

  On the other hand, when the light source unit 11 is not emitting light, the output voltage of the lighting circuit 18 is zero. Therefore, voltage cannot be supplied from the lighting circuit 18 to the second terminal portion 42. Since the input of the AC voltage to the lighting device 10 is continued when the light is turned off, the control voltage line 15 is set to about 15 V by the control power supply circuit 20. Therefore, the second diode D4 is forward-biased, and voltage is supplied from the control power supply circuit 20 to the second terminal unit 42 via the second diode D4. The step-down circuit 50a of the external unit 50 steps down the voltage of the second terminal portion 42 to obtain, for example, a 5V power supply 50b. The external unit 50 operates by supplying a voltage from the power source 50b to each part in the external unit 50.

  When the light is extinguished, the first diode D3 is reverse-biased, so that no voltage is supplied from the output of the lighting circuit 18 to the second terminal portion. The control power supply circuit 20 at the time of extinction supplies voltage not only to the control circuit such as the microcomputer 24 but also to the second terminal unit 42. However, since the power consumption by the control circuit such as the microcomputer 24, the FB units 16 and 28, and the I / F circuit 30 is lower when the light is turned off, there is a margin in the power supply capability of the control power supply circuit 20. A margin generated in the power supply capability of the control power supply circuit 20 is allocated to the second terminal portion 42. Further, since it is considered that the external unit 50, which is a voice input / output device, is not used when the light is turned off, it is considered that the power consumption of the speaker 50f when the light is turned off is small.

  As described above, when the power consumption of the control circuit such as the microcomputer 24 is large, the power is supplied from the output of the lighting circuit 18 to the second terminal portion 42 by supplying power from the control power supply circuit 20 to the second terminal portion 42. Do not supply. On the other hand, power is supplied from the control power supply circuit 20 to the control circuit and the second terminal section 42 when the power consumption of the control circuit such as the microcomputer 24 is small. Thereby, it is possible to supply power to the external unit 50 without increasing the output of the control power supply circuit 20.

  Further, by providing the first diode D3 and the second diode D4, a voltage can be supplied from the output of the lighting circuit 18 to the external unit 50 at the time of lighting, and a voltage can be supplied from the control power supply circuit 20 to the external unit 50 at the time of turning off. That is, the first diode D3 and the second diode D4 can automatically switch whether the voltage is supplied from the output of the lighting circuit 18 to the external unit 50 or from the control power supply circuit 20 to the external unit 50. Such an automatic switching function may be realized by means other than a diode.

  One of the important features according to the embodiment of the present invention is that the output voltage of the lighting circuit 18 is supplied to the external unit 50. The lighting unit and the lighting fixture 1 according to the embodiment of the present invention can be variously modified without losing its characteristics. For example, power may be supplied to the external unit 50 only with the output voltage of the lighting circuit 18. In this case, it is not necessary to connect the control power supply circuit 20 to the second terminal unit 32, but when the light source unit 11 is off, power cannot be supplied from the lighting circuit 18 to the external unit 50.

  When the external unit 50 is a voice input / output device, the light source unit 11 can be turned on, dimmed, and turned off without using a remote controller, and voice data from a portable terminal or the like transmitted to the communication unit 50e is output from the speaker 50f. It is convenient because it can be done. In the embodiment, the voice input / output device is adopted as the external unit 50, but any unit can be adopted as the external unit. For example, a wireless unit may be provided as the external unit 50. In the embodiment, the lighting device 10 is configured by two converters, but the lighting device 2 may be configured by one converter. For example, the number of parts may be reduced by using a buck converter or a SEPIC (Single Ended Primary Inverter Converter) to achieve both power factor improvement control and light source current control with a single converter.

  The voltage supply target from the control power supply circuit 20 may be a control circuit used for controlling the lighting circuit 18 and is not limited to the microcomputer 24 or the like. The control power supply circuit 20 supplies a voltage to the control circuit from the input voltage of the lighting circuit 18 when the light is turned on and off, and supplies a voltage to the second terminal unit 42 when the light is turned off.

DESCRIPTION OF SYMBOLS 1 Lighting fixture, 10 Lighting device, 11 Light source part, 20 Control power supply circuit, 40 1st terminal part, 42 2nd terminal part, 50 External unit

Claims (7)

A lighting circuit;
A first terminal connected to the output of the lighting circuit;
A second terminal connected to the output of the lighting circuit;
And an external unit connected to the second terminal portion. A control circuit used to control the lighting circuit;
2. The lighting unit according to claim 1, further comprising: a control power supply circuit that supplies voltage to the control circuit from the input voltage of the lighting circuit and supplies voltage to the second terminal unit. A first diode having a first anode and a first cathode, wherein the first anode is connected to an output of the lighting circuit, and the first cathode is connected to the second terminal portion;
A second diode having a second anode and a second cathode, wherein the second anode is connected to the control power supply circuit, and the second cathode is connected to the second terminal portion and the first cathode. The lighting unit according to claim 2, wherein:   The lighting unit according to claim 1, wherein the external unit is a voice input / output device having a speaker.   The lighting unit according to claim 1, wherein the external unit includes a communication unit that wirelessly communicates with an external communication device.   The lighting unit according to claim 1, wherein the external unit includes a step-down circuit that steps down the voltage of the second terminal unit to generate a predetermined voltage. A lighting circuit;
A first terminal connected to the output of the lighting circuit;
A light source unit connected to the first terminal unit;
A second terminal connected to the output of the lighting circuit;
And an external unit connected to the second terminal portion.

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