WO2015145506A1

WO2015145506A1 - Led lighting device

Info

Publication number: WO2015145506A1
Application number: PCT/JP2014/006052
Authority: WO
Inventors: 末広　善文; 林　雅則
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2014-03-24
Filing date: 2014-12-04
Publication date: 2015-10-01
Also published as: TW201547327A; JP2015185380A

Abstract

The purpose of the present invention is to enable equalizing the change in the optical output of a light source brought about by a first dimmer that performs forward-phase control of an AC voltage and the change in the optical output of a light source brought about by a second dimmer which performs reverse-phase control of an AC voltage. This LED lighting device (10) is provided with a pair of terminals (1, 2), a diode bridge (3), a conversion unit (4), a light source unit (5), a control circuit (6) and a power source unit (7). The control circuit (6) is provided with a determination unit (8) which has a first function for determining whether a dimmer (21) is a first dimmer which performs phase control of the AC voltage or a second dimmer which performs phase control of the AC voltage, and a second function for determining whether the dimmer (21) is in a conducting state or an interrupted state.

Description

LED lighting device

The present invention generally relates to a light emitting diode (LED) lighting device, and more particularly to an LED lighting device provided with an LED as a light source.

Heretofore, there has been proposed a lighting apparatus including a lighting load and a lighting power supply for supplying power to the lighting load (see Document 1 [Japanese Patent Application Publication No. 2013-186944]).

The illumination load comprises an illumination light source such as an LED. The illumination power supply is connected to an AC power supply via a dimmer. The dimmer can adjust the conduction period of phase control in an alternating voltage.

The illumination power supply includes a rectifier circuit. The rectifier circuit receives an AC voltage phase-controlled by the dimmer. A capacitor for reducing high frequency noise is connected to the input side of the rectifier circuit.

Generally as a dimmer, the dimmer which carries out order phase control of alternating current voltage (following, 1st dimmer), The dimmer which carries out reverse phase control of alternating current voltage (following, 2nd dimmer) And are known. The first dimmer goes from the on state to the off state when the absolute value of the AC voltage is zero. The second dimmer goes from the on state to the off state when the absolute value of the AC voltage is other than zero.

By the way, in the lighting fixture described in the literature 1, the capacitor | condenser is connected to the input side of the rectifier circuit in the power supply for illuminations. Therefore, in the lighting device, when the second dimmer is connected, when the second dimmer changes from the conductive state to the cut-off state, charge may be accumulated in the capacitor. Therefore, in the lighting device, when the second dimmer is connected, the light output of the illumination light source may be larger than when the first dimmer is connected. In other words, in the lighting device, it is difficult to make the change in the light output of the illumination light source by the first dimmer the same as the change in the light output of the illumination light source by the second dimmer.

The object of the present invention is to change the light output of the light source unit by the first dimmer that controls the AC voltage in the order phase, and change the light output of the light source unit by the second dimmer that controls the AC voltage in the reverse phase. It is in providing the LED lighting apparatus which can be made the same.

The LED lighting device of the present invention comprises a pair of terminals, a diode bridge for full-wave rectification of alternating current voltage, and a conversion unit for converting the voltage full-wave rectified by the diode bridge into a predetermined direct current voltage or a predetermined direct current Is equipped. Moreover, the LED lighting apparatus of this invention is equipped with the light source part which can be lighted with the said predetermined | prescribed direct current voltage converted by the said conversion part, or the said predetermined direct current, and the control circuit which controls the said conversion part. Furthermore, the LED lighting device of the present invention includes a power supply unit that generates a first DC voltage from the voltage that is full-wave rectified by the diode bridge and supplies the first DC voltage to the control circuit. The light source unit includes an LED. The pair of input ends of the diode bridge are respectively connected to the pair of terminals. A capacitor for removing noise is connected between the pair of input terminals. A normally-off switching element is connected in parallel to the diode bridge. The control circuit is configured such that, when a series circuit of an AC power supply that outputs the AC voltage and the dimmer is connected between the pair of terminals, the dimmer detects that the absolute value of the AC voltage is zero. It is determined whether the first dimmer performs phase control from the on state to the off state or the second dimmer performs phase control from the on state to the off state when the absolute value of the AC voltage is other than zero. And a second function that determines whether the dimmer is in the on state or the off state. The control circuit determines that the dimmer is the second dimmer by the determining unit, and determines that the dimmer has been switched from the on state to the off state by the determining unit. The switching element is turned on.

2 is a circuit diagram of the LED lighting device of Embodiment 1. FIG. FIG. 2 is a circuit diagram of a resistive voltage dividing circuit and a control circuit in the LED lighting device of Embodiment 1. FIG. 7 is a diagram showing a first reference waveform stored in advance in the control circuit in the LED lighting device of Embodiment 1. FIG. 7 is a diagram showing a second reference waveform stored in advance in the control circuit in the LED lighting device of Embodiment 1. It is a figure which shows the voltage waveform of the input voltage of LED lighting apparatus, and the current waveform of the input current of LED lighting apparatus regarding the case where a switching element is in an OFF state in the LED lighting apparatus of Embodiment 1. FIG. It is a figure which shows the voltage waveform of the input voltage of LED lighting apparatus, and the current waveform of the input current of LED lighting apparatus regarding the case where a switching element is in an OFF state in the LED lighting apparatus of Embodiment 1. FIG. It is a figure which shows the voltage waveform of 2nd DC voltage, and the voltage waveform of the voltage differentiated by the differential circuit regarding the case where a switching element is in an OFF state in the LED lighting apparatus of Embodiment 1. FIG. It is a correlation diagram of the conduction | electrical_connection angle by a dimmer, and the light output of a light source part regarding the case where the switching element is off in the LED lighting apparatus of Embodiment 1. FIG. It is a figure which shows the voltage waveform of the input voltage of LED lighting apparatus, and the current waveform of the input current of LED lighting apparatus regarding the case where a switching element is in an ON state in the LED lighting apparatus of Embodiment 1. FIG. It is a correlation diagram of the conduction | electrical_connection angle by a dimmer, and the light output of a light source part regarding the case where a switching element is in an ON state in the LED lighting apparatus of Embodiment 1. FIG. FIG. 2 is a schematic side view partially broken in the LED lighting device of Embodiment 1; 5 is a circuit diagram of an LED lighting device of Embodiment 2. FIG.

(Embodiment 1)
Hereinafter, the LED lighting device 10 of the present embodiment will be described with reference to FIGS. 1 to 11.

Also, hereinafter, phase control from the conducting state to the blocking state when the absolute value of the AC voltage is zero is referred to as order phase control. Furthermore, the phase control from the conducting state to the blocking state when the absolute value of the AC voltage is other than zero is called reverse phase control.

The LED lighting device 10 includes a pair of

terminals

1 and 2, a diode bridge 3 for full-wave rectification of alternating current voltage, and a conversion unit 4 for converting the voltage full-wave rectified by the diode bridge 3 into a predetermined direct current voltage ing. In addition, the LED lighting device 10 includes a light source unit 5 that can be lit by the predetermined DC voltage, a control circuit 6 that controls the conversion unit 4, and a power supply unit 7 that supplies power to the control circuit 6.

The LED lighting device 10 can electrically connect a series circuit of an AC power supply 20 that outputs an AC voltage and a dimmer 21 that dims the LED lighting device 10 between a pair of

terminals

1 and 2 . The alternating current power supply 20 is, for example, a commercial power supply. The LED lighting device 10 does not include the AC power supply 20 and the dimmer 21 as constituent requirements. Also, in the following, for convenience of explanation, one of the

terminals

1 and 2 of the pair of

terminals

1 and 2 is referred to as "first input terminal 1", and the other terminal 2 is referred to as "second input terminal 2".

The diode bridge 3 includes four diodes D1 to D4. A first connection point between the cathode of the diode D1 and the anode of the diode D2 is electrically connected to the first input terminal 1. A second connection point between the cathode of the diode D3 and the anode of the diode D4 is electrically connected to the second input terminal 2. The first connection point and the second connection point correspond to a pair of input ends of the diode bridge 3. In short, the pair of input ends of the diode bridge 3 are connected to the pair of

terminals

1 and 2 respectively.

A capacitor C1 for removing noise is electrically connected between the pair of input ends of the diode bridge 3.

The normally-off switching element Q1 is connected in parallel to the diode bridge 3. Specifically, the switching element Q1 is electrically connected between the pair of output ends of the diode bridge 3.

The switching element Q1 is, for example, a normally-off n-channel MOSFET (Metal Oxide Semiconductor Field Effect Transistor). The first main terminal (the drain terminal in the present embodiment) of the switching element Q1 is electrically connected to one of the pair of output ends of the diode bridge 3. The second main terminal (the source terminal in the present embodiment) of the switching element Q1 is electrically connected to the other output end of the pair of output ends of the diode bridge 3. A control terminal (a gate terminal in the present embodiment) of the switching element Q1 is electrically connected to the control circuit 6.

The conversion unit 4 is configured to convert the voltage full-wave rectified by the diode bridge 3 into the predetermined DC voltage. Further, the conversion unit 4 is configured to output the predetermined DC voltage to the light source unit 5. The conversion unit 4 is, for example, a booster circuit. Thus, the conversion unit 4 can light the light source unit 5. In addition, although the LED lighting apparatus 10 uses a booster circuit as the conversion part 4, it does not restrict to this. The conversion unit 4 may be, for example, a step-down circuit, a step-up / step-down circuit, or the like. Although the converter 4 is configured to convert the voltage full-wave rectified by the diode bridge 3 into the predetermined DC voltage, the present invention is not limited to this configuration. For example, the conversion unit 4 may be configured to convert the voltage full-wave rectified by the diode bridge 3 into a predetermined direct current. In this case, the conversion unit 4 is, for example, a constant current circuit.

The light source unit 5 includes a plurality of LEDs 9 (see FIG. 11). The LED 9 is, for example, an LED chip. In addition, in the LED lighting apparatus 10, although the number of LED9 is made into multiple, one may be sufficient.

The control circuit 6 is, for example, a microcomputer equipped with a program. The program is stored, for example, in a memory provided in advance in the microcomputer. In addition, although the LED lighting apparatus 10 uses the microcomputer as the control circuit 6, it is not restricted to this. The control circuit 6 may be configured by combining discrete components, for example.

The power supply unit 7 is configured to generate a first DC voltage from the voltage full-wave rectified by the diode bridge 3. Further, the power supply unit 7 is configured to supply the first direct current voltage to the control circuit 6. The power supply unit 7 is, for example, a three-terminal regulator. The input terminal of the three-terminal regulator is electrically connected to the one output terminal of the diode bridge 3. The output terminal of the three-terminal regulator is electrically connected to the control circuit 6. The ground terminal of the three-terminal regulator is electrically connected to the ground of the LED lighting device 10. As a result, the power supply unit 7 can generate the first direct current voltage from the voltage full-wave rectified by the diode bridge 3 and supply the first direct current voltage to the control circuit 6. Although the three-terminal regulator is used as the power supply unit 7 in the LED lighting device 10, the present invention is not limited to this. The power supply unit 7 may be, for example, a DC-DC converter.

The control circuit 6 is configured to receive a second DC voltage V1 corresponding to the voltage full-wave rectified by the diode bridge 3. The LED lighting device 10 includes a resistive voltage divider circuit 23. The resistive voltage divider circuit 23 is a series circuit of a resistor R1 and a resistor R2. One end of the resistor R 1 is electrically connected to the one output end of the diode bridge 3. The other end of the resistor R1 is electrically connected to one end of the resistor R2. Further, one end of the resistor R2 is electrically connected to the control circuit 6. The other end of the resistor R2 is electrically connected to the ground of the LED lighting device 10. As a result, a voltage (voltage across the resistor R2) obtained by dividing the voltage that has been full-wave rectified by the diode bridge 3 by the resistor voltage dividing circuit 23 is input to the control circuit 6. In other words, the control circuit 6 receives the second DC voltage V1 corresponding to the voltage full-wave rectified by the diode bridge 3. That is, in the LED lighting device 10, the voltage across the resistor R2 corresponds to the second DC voltage V1.

The control circuit 6 includes a differentiating circuit 13 that differentiates the second DC voltage V1. The differentiating circuit 13 can be configured, for example, by an operational amplifier, a resistor and a capacitor.

In addition, the control circuit 6 has a first function of determining whether the dimmer 21 is the first dimmer that controls the AC voltage in the order phase or the second dimmer that controls the AC voltage in the reverse phase. And a second function to determine whether the dimmer 21 is in the on state or in the off state. When the dimmer 21 is in the conductive state, it means that the opening / closing portion provided in advance in the dimmer 21 is in the on state. When the dimmer 21 is in the cut off state, it means that the opening / closing portion of the dimmer 21 is in the off state. The switching unit is connected in series to the AC power supply 20. When the dimmer 21 is a first dimmer, the opening / closing unit is, for example, a bidirectional thyristor. In addition, when the dimmer 21 is the second dimmer, the switching unit is, for example, a MOSFET, an IGBT (Insulated Gate Bipolar Transistor), or the like.

The determination unit 8 determines whether the dimmer 21 is the first dimmer or the second dimmer, the first determination unit 11 determines whether the dimmer 21 is in the on state or the off state. And a second determination unit 12 that determines whether the

The first determination unit 11 is configured to determine whether the dimmer 21 is the first dimmer or the second dimmer based on the waveform of the second DC voltage V1. .

The first determination unit 11 determines whether the dimmer 21 is the first dimmer based on the degree of coincidence between the waveform of the second DC voltage V1 and the first reference waveform (see FIG. 3) stored in advance. It is comprised so that it may determine whether or not. The first determination unit 11 is configured, for example, by combining an arithmetic circuit provided in advance in the microcomputer and the program. The first reference waveform is a voltage waveform when the dimmer 21 is a first dimmer. The first reference waveform is stored in the memory. The vertical axis in FIG. 3 represents a voltage. The horizontal axis of FIG. 3 represents time.

In addition, the first determination unit 11 uses the second dimmer as the dimmer 21 based on the degree of coincidence between the waveform of the second DC voltage V1 and the second reference waveform (see FIG. 4) stored in advance. It is configured to determine whether there is any. The second reference waveform is a voltage waveform when the dimmer 21 is a second dimmer. The second reference waveform is stored in the memory. The vertical axis in FIG. 4 represents a voltage. The horizontal axis of FIG. 4 represents time.

In the LED lighting device 10, the first determination unit 11 determines whether the dimmer 21 is the first dimmer based on the degree of coincidence between the waveform of the second DC voltage V1 and the first reference waveform. Although it is comprised so that judgment may be carried out, it does not restrict to this. Moreover, in the LED lighting device 10, the first determination unit 11 determines whether the dimmer 21 is the second dimmer based on the degree of coincidence between the waveform of the second DC voltage V1 and the second reference waveform. Although it is comprised so that it may determine, it does not restrict to this. The first determination unit 11 determines whether the dimmer 21 is the first dimmer or the second dimmer based on the degree of coincidence between the waveform of the second DC voltage V1 and the first reference waveform. May be determined. Alternatively, the first determination unit 11 determines whether the dimmer 21 is the first dimmer or the second dimmer based on the degree of coincidence between the waveform of the second DC voltage V1 and the second reference waveform. It may be configured to determine whether there is any.

The second determination unit 12 is configured to determine whether the dimmer 21 is in the on state or in the off state based on the second DC voltage V1. When the voltage value of the voltage V2 differentiated by the differentiating circuit 13 changes from a value larger than the preset threshold value Vth (see FIG. 7) to a value less than the threshold value Vth, the second determination unit 12 It is comprised so that it may determine with 21 having become the interruption | blocking state from the conduction | electrical_connection state. The second determination unit 12 is, for example, a determination circuit provided in advance in the microcomputer. T10 in FIG. 7 represents the point in time when the dimmer 21 is switched from the on state to the off state. Further, t11 in FIG. 7 represents a point in time when the voltage value of the voltage V2 becomes equal to or less than the threshold value Vth.

In the control circuit 6, the first determination unit 11 determines that the dimmer 21 is the second dimmer, and the second determination unit 12 determines that the dimmer 21 is switched off from the conductive state. When this occurs, the switching element Q1 is turned on. In other words, in the control circuit 6, the determination unit 8 determines that the dimmer 21 is the second dimmer, and the determination unit 8 determines that the dimmer 21 is switched from the conductive state to the disconnected state. At the same time, the switching element Q1 is turned on.

By the way, the inventors of the present application considered an LED lighting device (hereinafter, referred to as an LED lighting device of a comparative example) provided with a control circuit different from the control circuit 6. In addition, in the LED lighting apparatus of a comparative example, the same code | symbol is attached | subjected to the component similar to the LED lighting apparatus 10, and description is abbreviate | omitted suitably. In the following, for convenience of explanation, the control circuit 6 in the LED lighting device 10 may be referred to as "first control circuit 6", and the control circuit in the LED lighting device of the comparative example may be referred to as "second control circuit".

In the LED lighting device of the comparative example, the present inventors connected a first dimmer as the dimmer 21 between the pair of

terminals

1 and 2 and a second dimmer as the dimmer 21. Device was considered to be connected.

The second control circuit keeps the switching element Q1 in the off state regardless of whether the dimmer 21 is the first dimmer or the second dimmer and the dimmer 21 is in the on state or the off state. It is configured to

In the LED lighting device of the comparative example, when the dimmer 21 is the first dimmer, the voltage waveform of the input voltage V3 in the LED lighting device of the comparative example and the current waveform of the input current I1 in the LED lighting device of the comparative example Is shown in FIG. T1 and t3 in FIG. 5 represent the time when the dimmer 21 is switched from the disconnection state to the conduction state. T2 and t4 in FIG. 5 represent the time when the dimmer 21 is switched from the on state to the off state.

In the LED lighting device of the comparative example, when the dimmer 21 is the second dimmer, the voltage waveform of the input voltage V3 in the LED lighting device of the comparative example and the current of the input current I1 in the LED lighting device of the comparative example The waveforms are shown in FIG. T5 and t8 in FIG. 6 represent the time when the dimmer 21 is switched from the on state to the off state. T6 and t9 in FIG. 6 represent the time when the charge stored in advance in the capacitor C1 in the LED lighting device of the comparative example is discharged. T7 in FIG. 6 represents the point in time when the dimmer 21 becomes conductive from the cutoff state.

In the LED lighting device of the comparative example, the relationship between the conduction angle by the dimmer 21 and the light output of the light source unit 5 as shown in FIG. 8 is obtained. The vertical axis in FIG. 8 represents the magnitude of the light output of the light source unit 5. The horizontal axis in FIG. 8 represents the magnitude of the conduction angle by the dimmer 21. The curve shown by the solid line in FIG. 8 represents the case where the dimmer 21 is a second dimmer. A curve indicated by an alternate long and short dash line in FIG. 8 represents the case where the dimmer 21 is the first dimmer.

The light output of the light source unit 5 when the dimmer 21 is the second dimmer in the LED lighting device of the comparative example is, as shown in FIG. 8, the minimum value and the maximum value of the conduction angle by the dimmer 21 respectively. The light output of the light source unit 5 corresponding to the light source unit 5 is larger than the light output of the light source unit 5 when the dimmer 21 excluding the light output of the light source unit 5 is the first light controller. In the LED lighting device of the comparative example, when the dimmer 21 is the second dimmer, charge is accumulated in the capacitor C1 in the LED lighting device of the comparative example even when the dimmer 21 is switched from the conduction state to the cutoff state. It may have been. Therefore, in the LED lighting device of the comparative example, the electric charge accumulated in the capacitor C1 may be supplied to the light source unit 5, and the light output of the light source unit 5 is set to, for example, the light source unit 5 set by the dimmer 21. May be greater than the light output of the Therefore, in the LED lighting device of the comparative example, it is difficult to make the change of the light output of the light source unit 5 by the first dimmer the same as the light output of the light source unit 5 by the second dimmer.

In the first control circuit 6 in the LED lighting device 10, the determination unit 8 determines that the dimmer 21 is the second dimmer, and the determination unit 8 changes the dimmer 21 from the conduction state to the disconnection state. When it is determined, the switching element Q1 is turned on. Thereby, in the LED lighting device 10, when the dimmer 21 which is the second dimmer changes from the conduction state to the blocking state, it is possible to discharge the charge stored in advance in the capacitor C1. The charge stored in advance in the capacitor C1 is discharged through the diode D2, the switching element Q1 and the diode D3 when the switching element Q1 is turned on from the off state.

When the dimmer 21 in the LED lighting device 10 is the second dimmer, a voltage waveform of the input voltage V3 in the LED lighting device 10 and a current waveform of the input current I1 in the LED lighting device 10 are shown in FIG. . T12 and t14 in FIG. 9 represent the time when the dimmer 21 is switched from the on state to the off state. T13 in FIG. 9 represents the time when the dimmer 21 is switched from the cutoff state to the conductive state.

In the LED lighting device 10, the relationship between the conduction angle by the dimmer 21 and the light output of the light source unit 5 as shown in FIG. 10 is obtained. The vertical axis in FIG. 10 represents the magnitude of the light output of the light source unit 5. The horizontal axis in FIG. 10 represents the magnitude of the conduction angle of the dimmer 21. The curve indicated by the solid line in FIG. 10 represents the case where the dimmer 21 is the first dimmer and the case where the dimmer 21 is the second dimmer.

The light output of the light source unit 5 when the dimmer 21 is the second dimmer in the LED lighting device 10 is, as shown in FIG. 10, the dimmer as the conduction angle by the dimmer 21 increases. It changes in the same manner as the change of the light output of the light source unit 5 in the case where 21 is the first dimmer. Thereby, in the LED lighting device 10, the change of the light output of the light source unit 5 when the dimmer 21 is the first dimmer, and the light source unit 5 when the dimmer 21 is the second dimmer. It is possible to make the change of the light output of the same. That is, in the LED lighting device 10, it is possible to make the change in the light output of the light source unit 5 by the first dimmer the same as the change in the light output of the light source 5 by the second dimmer.

The LED lighting device 10 is, for example, an LED bulb as shown in FIG. The LED lighting apparatus 10 includes a module substrate including a pair of

terminals

1 and 2, a capacitor C 1, a diode bridge 3, a switching element Q 1, a resistance voltage dividing circuit 23, a conversion unit 4, a control circuit 6 and a power supply unit 7. . In addition, the LED lighting device 10 includes a housing 15 for housing a module substrate, a base 16, a light source unit 5 attached to one surface of the housing 15, and a globe 17 for diffusing light emitted from the light source unit 5. Is equipped. Note that A1 in FIG. 11 represents an area in which the module substrate is disposed.

The module substrate includes a pair of

terminals

1 and 2, a capacitor C 1, a diode bridge 3, a switching element Q 1, a resistance voltage dividing circuit 23, a conversion unit 4, a control circuit 6 and a power supply unit 7 on a printed circuit board on which a conductor pattern is formed. Are electrically mounted.

The material of the housing 15 is, for example, a material having a high thermal conductivity compared to a resin. The material having high thermal conductivity compared to resin is, for example, aluminum.

The light source unit 5 includes a plurality of LEDs 9, a metal base printed wiring board 18 on which the plurality of LEDs 9 are electrically mounted, and a fluorescent member 19 covering the plurality of LEDs 9.

The emission color of the light source unit 5 is, for example, white. Each LED 9 is, for example, an LED chip that emits blue light. The connection relationship of each LED 9 may be, for example, a series connection, a parallel connection, a connection combining a series connection and a parallel connection, or the like. The metal base printed wiring board 18 is thermally coupled to the housing 15 via the heat dissipating sheet having electrical insulation and thermal conductivity on the one surface of the housing 15. The fluorescent member 19 is formed of, for example, a mixture of a yellow phosphor that is excited by blue light emitted from each of the LEDs 9 and emits broad yellow light and a translucent resin (hereinafter, first resin). There is. The first resin is, for example, a silicone resin.

The material of the globe 17 is, for example, a translucent material. The translucent material may be, for example, a translucent resin (hereinafter, second resin), glass, or the like. The second resin is, for example, an acrylic resin.

In addition, in this embodiment, although the LED light bulb is illustrated as the LED lighting apparatus 10, it does not restrict to this. The LED lighting apparatus 10 may be, for example, an LED lighting apparatus including an LED light bulb and a tool body that holds the LED light bulb. The LED lighting apparatus is, for example, a ceiling light.

The LED lighting device 10 according to the present embodiment described above includes the pair of

terminals

1 and 2, the diode bridge 3 for full-wave rectification of alternating current voltage, and the voltage full-wave rectified by the diode bridge 3 to a predetermined direct voltage or And a converter 4 for converting the current into a direct current. Further, the LED lighting device 10 includes a light source unit 5 that can be lit by the predetermined DC voltage converted by the conversion unit 4 or the predetermined DC current, and a control circuit 6 that controls the conversion unit 4. Furthermore, the LED lighting device 10 includes a power supply unit 7 that generates a first DC voltage from the voltage full-wave rectified by the diode bridge 3 and supplies the first DC voltage to the control circuit 6. The light source unit 5 includes an LED 9. The pair of input ends of the diode bridge 3 are connected to the pair of

terminals

1 and 2 respectively. A capacitor C1 for removing noise is connected between the pair of input terminals. The normally-off switching element Q1 is connected in parallel to the diode bridge 3. The control circuit 6 is configured such that when the series circuit of the AC power supply 20 for outputting the AC voltage and the dimmer 21 is connected between the pair of

terminals

1 and 2, the dimmer 21 has an absolute value of the AC voltage. The first dimmer performs phase control from the conducting state to the blocking state when it is zero, and the second dimmer performs phase control from the conducting state to the blocking state when the absolute value of the AC voltage is other than zero. The determination unit 8 is provided with a first function of determining presence or absence and a second function of determining whether the dimmer 21 is in the on state or in the off state. In the control circuit 6, when the determination unit 8 determines that the dimmer 21 is the second dimmer and the determination unit 8 determines that the dimmer 21 has changed from the on state to the off state, The switching element Q1 is turned on. Thereby, in the LED lighting device 10, the change of the light output of the light source unit 5 by the first dimmer that controls the AC voltage in the order phase, and the light of the light source unit 5 by the second dimmer that controls the AC voltage in reverse phase It is possible to make the output change the same.

The control circuit 6 is configured to receive a second DC voltage V1 corresponding to the voltage full-wave rectified by the diode bridge 3. The determination unit 8 determines whether the dimmer 21 is the first dimmer or the second dimmer, the first determination unit 11 determines whether the dimmer 21 is in the on state and the off state. And a second determination unit 12 that determines which of the two. The first determination unit 11 is configured to determine whether the dimmer 21 is the first dimmer or the second dimmer based on the waveform of the second DC voltage V1. ing. The second determination unit 12 is configured to determine whether the dimmer 21 is in the on state or in the off state based on the second DC voltage V1. The control circuit 6 determines that the first determination unit 11 determines that the dimmer 21 is the second dimmer, and the second determination unit 12 determines that the dimmer 21 has been switched off from the conductive state. When it is turned on, the switching element Q1 is turned on. Thereby, in the LED lighting device 10, the change of the light output of the light source unit 5 by the first dimmer that controls the AC voltage in the order phase, and the light of the light source unit 5 by the second dimmer that controls the AC voltage in reverse phase It is possible to make the output change the same.

The control circuit 6 includes a differentiating circuit 13 that differentiates the second DC voltage V1. When the voltage value of the voltage V2 differentiated by the differentiating circuit 13 changes from a value larger than the threshold value Vth set in advance to a value smaller than the threshold value Vth, the second determination unit 12 starts the dimmer 21 from the conductive state. It is comprised so that it may determine with having become the interruption | blocking state. As a result, the second determination unit 12 can immediately determine when the dimmer 21 changes from the on state to the off state.

The switching element Q1 is connected between a pair of output ends of the diode bridge 3. Thus, in the LED lighting device 10, for example, a normally-off n-channel MOSFET can be used as the switching element Q1.

The switching element Q1 is a normally-off n-channel MOSFET. The first main terminal (the drain terminal in the present embodiment) of the switching element Q1 is connected to one of the pair of output ends of the diode bridge 3. The second main terminal (the source terminal in the present embodiment) of the switching element Q1 is connected to the other one of the pair of output terminals. A control terminal (in the present embodiment, a gate terminal) of the switching element Q1 is connected to the control circuit 6. Thereby, in the LED lighting device 10, when the control circuit 6 turns on the switching element Q1 when the dimmer 21 which is the second dimmer is switched from the conductive state to the cut-off state, the capacitor C1 is turned on. It is possible to discharge the charge stored in advance.

Second Embodiment
The basic configuration of the LED lighting device 30 according to the present embodiment is the same as that of the LED lighting device 10 according to the first embodiment, and the switching element Q2 is connected between a pair of input ends of the diode bridge 3 as shown in FIG. Is different from the first embodiment. In addition, in this embodiment, the same code | symbol is attached | subjected to the component similar to Embodiment 1, and description is abbreviate | omitted suitably.

The switching element Q 2 includes a light emitting diode 14 and a photo triac 22. The switching element Q2 is configured such that the light emitting diode 14 and the photo triac 22 are optically coupled. As the switching element Q2, for example, a photo triac coupler (for example, product number APT1221) manufactured by Panasonic Corporation may be used.

The anode of the light emitting diode 14 is electrically connected to the control circuit 6. The cathode of the light emitting diode 14 is electrically connected to the other output end of the diode bridge 3. In short, the cathode of the light emitting diode 14 is connected to the low potential side of the pair of output ends of the diode bridge 3.

The first main terminal of the photo triac 22 is electrically connected to the one input end of the diode bridge 3. The second main terminal of the photo triac 22 is electrically connected to the other input end of the diode bridge 3.

The control circuit 6 emits light when the determination unit 8 determines that the dimmer 21 is the second dimmer and the determination unit 8 determines that the dimmer 21 has changed from the on state to the off state. A light emission signal for causing the diode 14 to emit light is output to the light emitting diode 14. In the switching element Q2, when the light emitting diode 14 emits light, the photo triac 22 is switched from the off state to the on state. Thereby, in the LED lighting device 30, when the dimmer 21 which is the second dimmer changes from the conductive state to the cut-off state, it is possible to discharge the charge stored in advance in the capacitor C1. The charge stored in advance in the capacitor C1 is discharged via the switching element Q2 when the switching element Q2 is turned on from the off state.

In the LED lighting device 30 of the present embodiment described above, the switching element Q 2 is connected between the pair of input ends of the diode bridge 3. Thereby, in the LED lighting device 30, for example, it is possible to quickly discharge the charge stored in advance in the capacitor C1, as compared with the case where the switching element Q2 is connected between the pair of output ends of the diode bridge 3. Become.

The switching element Q 2 includes a light emitting diode 14 and a photo triac 22. The switching element Q2 is configured such that the light emitting diode 14 and the photo triac 22 are optically coupled. The anode of the light emitting diode 14 is connected to the control circuit 6. The cathode of the light emitting diode 14 is connected to the low potential side (the other output end of the diode bridge 3) of the pair of output ends of the diode bridge 3. The first main terminal of the photo triac 22 is connected to one of the pair of input ends of the diode bridge 3. The second main terminal of the photo triac 22 is connected to the other one of the pair of input terminals. Thereby, in the LED lighting device 30, when the control circuit 6 turns on the switching element Q2 when the dimmer 21 which is the second dimmer is turned off from the conductive state, the capacitor C1 is turned on. It is possible to discharge the charge stored in advance.

Claims

A pair of terminals, a diode bridge for full-wave rectification of alternating current voltage, a conversion unit for converting the voltage full-wave rectified by the diode bridge into a predetermined direct current voltage or a predetermined direct current, and A light source portion that can be lit by the predetermined DC voltage or the predetermined DC current, a control circuit that controls the conversion portion, and a first DC voltage generated from a voltage that is full-wave rectified by the diode bridge A power supply unit that supplies the first direct current voltage to the control circuit;
The light source unit comprises an LED,
A pair of input ends of the diode bridge are respectively connected to the pair of terminals, and a capacitor for removing noise is connected between the pair of input ends,
A normally-off switching element is connected in parallel to the diode bridge;
The control circuit is configured such that, when a series circuit of an AC power supply that outputs the AC voltage and the dimmer is connected between the pair of terminals, the dimmer detects that the absolute value of the AC voltage is zero. It is determined whether the first dimmer performs phase control from the on state to the off state or the second dimmer performs phase control from the on state to the off state when the absolute value of the AC voltage is other than zero. And a second function that determines whether the dimmer is in the on state or the off state.
The control circuit determines that the dimmer is the second dimmer by the determining unit, and determines that the dimmer has been switched from the on state to the off state by the determining unit. An LED lighting device, wherein the switching element is turned on.
The control circuit is configured to receive a second DC voltage corresponding to a voltage full-wave rectified by the diode bridge;
The determination unit determines a first determination unit that determines which of the first dimmer and the second dimmer is the dimmer, and the dimmer is in a conductive state and in a disconnected state. And a second determination unit that determines which
The first determination unit is configured to determine which of the first dimmer and the second dimmer is the dimmer based on a waveform of the second direct current voltage. ,
The second determination unit is configured to determine whether the dimmer is in the on state or the off state based on the second DC voltage.
The control circuit determines that the dimmer is determined to be the second dimmer by the first determination unit, and determines that the dimmer has been switched off from the conductive state by the second determination unit. The LED lighting device according to claim 1, wherein the switching element is turned on when being turned on.
The control circuit includes a differentiating circuit that differentiates the second DC voltage.
When the voltage value of the voltage differentiated by the differentiating circuit changes from a value larger than a predetermined threshold value to a value less than the threshold value, the second determination unit determines that the dimmer is disconnected from the conductive state. It is comprised so that it may determine with becoming. The LED lighting apparatus of Claim 2 characterized by the above-mentioned.
The LED lighting device according to any one of claims 1 to 3, wherein the switching element is connected between a pair of output ends of the diode bridge.
The switching element is a normally-off n-channel MOSFET,
The first main terminal of the switching element is connected to one of the pair of output ends of the diode bridge, and the second main terminal of the switching element is the other of the pair of output ends. The LED lighting device according to claim 4, wherein the output terminal is connected, and a control terminal of the switching element is connected to the control circuit.
The LED lighting device according to any one of claims 1 to 3, wherein the switching element is connected between a pair of input ends of the diode bridge.
The switching device includes a light emitting diode and a photo triac, and the switching device is configured to optically couple the light emitting diode and the photo triac.
The anode of the light emitting diode is connected to the control circuit, and the cathode of the light emitting diode is connected to the low potential side of the pair of output ends of the diode bridge,
The first main terminal of the photo triac is connected to one of the pair of input ends of the diode bridge, and the second main terminal of the photo triac is the other of the pair of input ends. The LED lighting device according to claim 6, wherein the LED lighting device is connected to the input terminal.