TW201448669A - Lighting device and lighting fixture using the same - Google Patents

Abstract

An illumination device, provided with a rectifier circuit, a DC-DC converter, and a filter. A first output end of the rectifier circuit is connected, via an inductor, a first diode, and a primary coil, to a first terminal of the switching element. The first terminal is connected to the anode of a first diode via a first capacitor. A second terminal of the switching element is connected to a second output end of the rectifier and connected to the cathode of the first diode via a second capacitor. A control terminal of the switching element is connected to a control circuit. The first end of a secondary coil is connected to the second end of the secondary coil via second and third diodes. A load is connected between the cathodes of the second and third diodes and the center tap of the secondary coil.

Description

Electric lamp lighting device and lighting device using the same

The present invention relates to a lamp lighting device that illuminates a load, that is, a load, and a lighting fixture using the same.

In the past, an insulated AC-DC voltage converter and a DC power supply device for LEDs using the insulated AC-DC voltage converter have been proposed (JP-A-2008-187821 (hereinafter referred to as "Document 1"). As described in Document 1, the DC power supply device for LEDs has a DC-illuminated LED load as a load.

In addition, as for the insulated AC-DC voltage converter, a switching power supply device having the configuration shown in FIG. 14 is known (Japanese Patent Laid-Open No. 2010-124567 (hereinafter referred to as "Document 2"). ).

The switching power supply device having the configuration shown in FIG. 14 includes a common mode filter 60, a rectifier circuit 61, a PFC circuit 62, and an insulated DC/DC voltage converter 63. Document 2, with map The switching power supply device having the configuration shown in FIG. 14 has a two-stage configuration including the PFC circuit 62 and the insulated DC/DC voltage converter 63.

Further, in Document 2, a switching power supply device 70 having the configuration shown in Fig. 15 is proposed.

The switching power supply device 70 is a single-stage switching voltage converter including an FET 71, a flyback transformer 72, a diode 73, a smoothing capacitor 74, and a control circuit 75. Further, the switching power supply device 70 includes a common mode filter 76 and a rectifier circuit 77. In Document 2, the switching power supply device 70 includes a power factor improvement and a harmonic suppression function equivalent to the PFC circuit 62 including the switching power supply device having the configuration shown in FIG. 14, and has an insulation function.

However, since the switching power supply device having the configuration shown in FIG. 14 has a two-stage configuration including the PFC circuit 62 and the insulated DC/DC voltage converter 63, it is difficult to reduce the size of the switching power supply device.

On the other hand, the switching power supply device 70 having the configuration shown in FIG. 15 is a single-stage switching voltage converter including an FET 71, a flyback transformer 72, a diode 73, a smoothing capacitor 74, and a control circuit 75. Therefore, the switching power supply device 70 can be miniaturized as compared with the switching power supply device having the configuration shown in FIG.

The inventors of the present invention considered using an LED load as the load 80 in the switching power supply unit 70.

However, when the LED load is used as the load 80 in the switching power supply device 70, and the frequency of the input voltage of the rectifier circuit 77 is in the range of, for example, 50 to 120 [Hz], the output voltage of the rectifier circuit 77 is 0 [ In the vicinity of V], the load 80 does not light, and the light output of the load 80 may flicker. Therefore, in the switching power supply device 70, it is necessary to use an electrolytic capacitor as the capacitor 78 connected between the output terminals of the rectifier circuit 77. Further, when the electrolytic capacitor is used as the capacitor 78 in the switching power supply device 70, the reliability of the switching power supply device 70 may be lowered.

The inventors of the present invention considered a switching power supply device-based electric lamp lighting device having the configuration shown in Figs. 14 and 15 . Moreover, the inventors of the present invention considered the illuminating device for a DC power supply device for LEDs described in Document 1.

Therefore, an object of the present invention is to provide an electric lamp lighting device and a lighting fixture using the same, which can achieve miniaturization and achieve reliability improvement.

The electric lamp lighting device of the present invention includes: a first rectifying circuit that performs full-wave rectification on an alternating current voltage; and a DC-DC voltage converter that converts a voltage that is full-wave rectified by the first rectifying circuit into a predetermined direct current voltage. The DC-DC voltage converter includes: a first inductor; a first diode; a first capacitor and a second capacitor; and a transformer including a primary coil and a secondary coil; a switching element; a control circuit; The switching element is turned on and off to control, and the second rectifying circuit performs full-wave rectification on the voltage generated in the secondary coil. The second rectifier circuit includes a second diode and a third diode. The input side of the first rectifier circuit is provided with a filter for removing noise generated in the DC-DC voltage converter. The second The secondary coil is provided with a center tap. The first output terminal of the pair of output terminals of the first rectifier circuit is connected to the anode side of the first diode via the first inductor. The cathode side of the first diode is connected to the first main terminal of the switching element via the primary coil. The first main terminal of the switching element is connected to the anode side of the first diode via the first capacitor. a second main terminal of the switching element is connected to a second output end of the pair of output ends of the first rectifier circuit, and is connected to the cathode side of the first diode via the second capacitor . The control terminal of the switching element is connected to the control circuit. The first end of the secondary coil is connected to the anode side of the second diode. The cathode side of the second diode is connected to the cathode side of the third diode. The anode side of the third diode is connected to the second end of the secondary coil. The lamp lighting device is configured to electrically connect a lighting target to the cathode side of the second diode and the third diode and the center tap.

In still another feature of the invention, a gap is preferably provided between the primary coil and the secondary coil. Preferably, the primary coil is connected to the third capacitor in parallel.

According to still another aspect of the present invention, the cathode side of each of the second diode and the third diode is connected to the first end of the second inductor, and the load is electrically connected to the load. The second end of the second inductor is between the center tap and the center tap.

According to still another aspect of the present invention, the cathode side of each of the second diode and the third diode is connected to the center tap via the second inductor and the fourth capacitor, and is configured to be The load is electrically connected between the connection point of the second inductor and the fourth capacitor, and between the center tap.

In another feature of the present invention, the control circuit is configured to shorten the on-time of the switching element as the voltage across the second capacitor increases, and to lengthen the switching according to the voltage decrease across the second capacitor. The conduction time of the component.

In other features of the invention, it is preferred that a dimmer indicating the output voltage of the DC-DC voltage converter is coupled to the input side of the filter. The control circuit is preferably configured to control the on-time of the switching element with the indication from the dimmer.

The lighting fixture of the present invention comprises: an LED module; and the lamp lighting device, wherein the LED module is illuminated as the load.

In the electric lamp lighting device of the present invention, miniaturization can be achieved and reliability can be improved.

In the lighting fixture of the present invention, miniaturization can be achieved and reliability can be improved.

1‧‧‧ filter

2‧‧‧1st rectifier circuit

2a, 2b‧‧‧ output

3‧‧‧DC/DC voltage converter

4‧‧‧2nd rectifier circuit

5‧‧‧Control circuit

6‧‧‧Dimmer

10, 11, 12, 13, 14‧‧‧Lighting device

20‧‧‧LED module

21‧‧‧LED components

22‧‧‧Installation substrate

23‧‧‧ Appliance body

23a‧‧‧ bottom wall

23b‧‧‧ Sidewall

23c‧‧‧锷

24‧‧‧Light diffuser

25‧‧‧1st connection line

30‧‧‧ Lighting fixtures

31‧‧‧ frame

32‧‧‧ spacers

33‧‧‧2nd connection line

40‧‧‧ top board material

40a‧‧‧buried holes

41a‧‧‧2nd connector

41b‧‧‧1st connector

60‧‧‧Common mode filter

61‧‧‧Rectifier circuit

62‧‧‧PFC circuit

63‧‧‧Insulated DC/DC voltage converter

70‧‧‧Switching power supply unit

71‧‧‧FET

72‧‧‧Returning transformer

73‧‧‧ diode

74‧‧‧Smoothing capacitor

75‧‧‧Control circuit

76‧‧‧Common mode filter

77‧‧‧Rectifier circuit

78‧‧‧ capacitor

80‧‧‧load

C1, C1, C3, C4‧‧‧ capacitors

D1, D2, D3‧‧‧ diode

L1, L2‧‧‧ inductance

N1‧‧‧ primary coil

N2‧‧2nd coil

P1‧‧‧ connection point

Q1‧‧‧Switching components

T1‧‧‧ transformer

Va‧‧‧ commercial power supply

V _{C2max ‧‧‧max}

V _{C2min ‧‧‧min}

Preferred embodiments of the present invention are described in more detail below. Other features and advantages of the present invention will be further understood from the following detailed description and appended claims.

Fig. 1 is a circuit diagram of a lamp lighting device of a first embodiment.

2 is an electric lamp lighting device according to the first embodiment, and FIG. 2A is an explanatory diagram of a voltage waveform of an input voltage and a current waveform of an input current, and FIG. 2B is an explanatory diagram of a current waveform of an output current.

Fig. 3 is a schematic cross-sectional view showing a lighting fixture of the first embodiment.

Fig. 4 is a circuit diagram of a lamp lighting device of a second embodiment.

Fig. 5 is an explanatory diagram showing a current waveform of an output current in the electric lamp lighting device of the second embodiment.

Fig. 6 is a circuit diagram of a lamp lighting device of a third embodiment.

Fig. 7 is an explanatory diagram showing a current waveform of an output current in the electric lamp lighting device of the third embodiment.

Fig. 8 is a circuit diagram of a lamp lighting device of a fourth embodiment.

Fig. 9 is an explanatory diagram showing voltage waveforms of voltages across the second capacitor in the electric lamp lighting device of the fourth embodiment.

Fig. 10 is an explanatory diagram showing a current waveform of an output current in the electric lamp lighting device of the fourth embodiment.

Fig. 11 is a circuit diagram of a lamp lighting device of a fifth embodiment.

Fig. 12 is a view showing a lamp lighting device according to a fifth embodiment, Fig. 12A is an explanatory diagram of a voltage waveform of an input voltage, and Fig. 12B is an explanatory diagram of a current waveform of an output current.

Fig. 13 is a view showing the correlation between the dimming level of the dimmer and the duty ratio of the switching element in the electric lamp lighting device of the fifth embodiment.

Fig. 14 is a circuit diagram of a conventional switching power supply unit.

Fig. 15 is a circuit diagram of another switching power supply device of a conventional example.

(Preferred form of implementing the invention)

(Embodiment 1)

Hereinafter, an electric lamp lighting device of this embodiment will be described with reference to Figs. 1, 2A and 2B.

The electric lamp lighting device 10 of the present embodiment is configured to illuminate an LED (Light Emitting Diode) module 20 that is to be placed in a lighted state.

The LED module 20 includes a plurality of (three in the illustrated example) LED elements 21. In the present embodiment, the connection relationship of the plurality of LED elements 21 is determined to be connected in series, but is not limited thereto. The connection relationship of the plurality of LED elements 21 may be, for example, connected in parallel, or may be a combination of a series connection and a parallel connection. Further, in the present embodiment, the number of the LED elements 21 is set to be plural, but it may be one.

The electric lamp lighting device 10 includes a filter 1, a first rectifying circuit 2, and a DC-DC voltage converter 3. In the electric lamp lighting device 10, the LED module 20 is electrically connected to the output side of the DC-DC voltage converter 3.

The filter 1 includes, for example, a capacitor and a choke coil. In the electric lamp lighting device 10, the input side of the filter 1 is electrically connected to a commercially available electric power source Va. Further, in the electric lamp lighting device 10, the commercially available electric power source Va is not used as a constituent element.

The filter 1 is configured to suppress the noise generated in the DC-DC voltage converter 3 from being transmitted to the commercial power source Va side. In other words, the filter 1 is configured to remove noise generated in the DC-DC voltage converter 3. Again, filtering The device 1 is configured to suppress the transmission of noise contained in the AC voltage from the commercially available electric power source Va to the DC-DC voltage converter 3 side.

The first rectifier circuit 2 is configured to perform full-wave rectification of the AC voltage from the filter 1. The first rectifier circuit 2 is, for example, a diode bridge composed of four diodes.

The DC-DC voltage converter 3 is configured to convert a voltage that is full-wave rectified by the first rectifier circuit 2 into a predetermined DC voltage. As the DC-DC voltage converter 3, for example, a flyback type switching power supply circuit can be employed. The DC-DC voltage converter 3 includes an inductor (first inductor) L1, a diode (first diode) D1, three capacitors C1 to C3, a transformer T1, a switching element Q1, a control circuit 5, and a second Rectifier circuit 4. Further, in the present embodiment, the capacitors C1 to C3 are the first capacitor to the third capacitor.

The transformer T1 includes a primary coil N1 and a secondary coil N2. The secondary coil N2 is provided with a center tap.

As the switching element Q1, for example, a MOSFET (Metal-Oxide-Semiconductor Field-effect Transistor) can be used.

The control circuit 5 is configured to control the on and off of the switching element Q1. Specifically, the control circuit 5 is configured to output a control signal for controlling the on and off of the switching element Q1. For the control signal, a PWM (Pulse Width Modulation) signal can be used. The switching element Q1 is configured to be turned on and off in accordance with a control signal from the control circuit 5.

The control circuit 5 is a microcomputer in which an appropriate program is installed. The program is stored, for example, in a memory (not shown) that is preset in the microcomputer.

The second rectifier circuit 4 is configured to perform full-wave rectification of the voltage generated in the secondary winding N2 of the transformer T1. The second rectifier circuit 4 includes two diodes D2 and D3. Further, in the present embodiment, the diode D2 and the diode D3 are the second diode and the third diode.

In the present embodiment, a switch (not shown) that can supply power from the commercially available electric power source Va to the lamp lighting device 10 is provided in the power supply path between the input side of the filter 1 and the commercially available electric power source Va.

The input side of the first rectifier circuit 2 is electrically connected to the output side of the filter 1.

Among the pair of output terminals 2a and 2b of the first rectifier circuit 2, the first output terminal 2a is connected to the first end of the inductor L1. The second end of the inductor L1 is connected to the anode side of the diode D1. The cathode side of the diode D1 is connected to the first end of the primary winding N1 of the transformer T1. The second end of the primary coil N1 is connected to the first main terminal of the switching element Q1 (in the present embodiment, the 汲 terminal). A capacitor C3 is connected in parallel to the primary coil N1.

The 汲 terminal of the switching element Q1 is connected to the anode side of the diode D1 via the capacitor C1. The second main terminal (the source terminal in the present embodiment) of the switching element Q1 is connected to the second output terminal 2b of the pair of output terminals 2a and 2b of the first rectifier circuit 2. Further, the source terminal of the switching element Q1 is connected to the cathode side of the diode D1 via the capacitor C2. The control terminal (the gate terminal in the present embodiment) of the switching element Q1 is connected to the control circuit 5.

The first end of the secondary coil N2 of the transformer T1 is connected to the anode side of the diode D2. The cathode side of the diode D2 is connected to the cathode side of the diode D3. The anode side of the diode D3 is connected to the second end of the secondary coil N2. In the present embodiment, the anode side of the LED module 20 is connected to the cathode side of each of the diodes D2 and D3. Further, in the present embodiment, the cathode side of the LED module 20 is connected to the center tap of the secondary coil N2. In summary, the electric lamp lighting device 10 is configured to electrically connect the LED module 20 between the cathode side of each of the diodes D2 and D3 and the center tap of the secondary coil N2. Thereby, the electric lamp lighting device 10 can illuminate the LED module 20.

The operation of the DC-DC voltage converter 3 in the electric lamp lighting device 10 of the present embodiment will be described below. Further, as described below, power is supplied from the commercially available electric power source Va to the electric lamp lighting device 10 by the above-described switch.

In the DC-DC voltage converter 3, when the switching element Q1 is in an on state and the voltage that is full-wave rectified by the first rectifying circuit 2 is a large voltage (hereinafter referred to as "voltage of a high voltage region"), it is high. The voltage of the voltage region is supplied to the capacitor C2 via the inductor L1 and the diode D1. Further, in the DC-DC voltage converter 3, after the capacitor C2 is charged, the voltage across the capacitor C2 is supplied to the primary winding N1 of the transformer T1, and the magnetic energy is stored in the primary winding N1. In addition, the voltage of the high voltage region means a voltage above the forward voltage (forward voltage) of the diode D1.

In the DC-DC voltage converter 3, when the switching element Q1 is in the on state and the voltage is full-wave rectified by the first rectifying circuit 2 (hereinafter referred to as "voltage in the low voltage region"), The voltage in the low voltage region is supplied to the lower portion of the first rectifier circuit 2 via the inductor L1, the capacitor C1, and the switching element Q1. Potential side. In other words, in the electric lamp lighting device 10, when the switching element Q1 is in the on state and the voltage of the full-wave rectification via the first rectifying circuit 2 is the voltage of the low voltage region, the paired output ends of the first rectifying circuit 2 2a and 2b are short-circuited via switching element Q1. As a result, in the electric lamp lighting device 10 of the present embodiment, the high-frequency component included in the switching frequency of the switching element Q1 can be discharged to the ground side via the low potential side of the first rectifier circuit 2. Therefore, in the electric lamp lighting device 10, the high frequency component contained in the switching frequency of the switching element Q1 can be reduced, and power factor improvement can be achieved. In addition, the voltage of the low voltage region means a voltage that is less than the forward voltage (forward voltage) of the diode D1.

In the DC-DC voltage converter 3, after the switching element Q1 is turned from the on state to the off state, the magnetic energy stored in the primary winding N1 of the transformer T1 is transmitted to the secondary winding N2. Further, in the DC-DC voltage converter 3, each of the diodes D2 and D3 performs full-wave rectification of the voltage generated in the secondary winding N2 of the transformer T1. Further, the DC-DC voltage converter 3 outputs an output current as shown in FIG. 2B to the LED module 20. 2A shows a voltage waveform of an input voltage and a current waveform of an input current in the electric lamp lighting device 10. Moreover, the solid line in FIG. 2A indicates the current waveform of the input current of the electric lamp lighting device 10. Moreover, the single-dot chain line in FIG. 2A indicates the voltage waveform of the input voltage of the electric lamp lighting device 10.

In the electric lamp lighting device 10 of the present embodiment, a gap is provided between the primary winding N1 and the secondary winding N2 of the transformer T1. Thereby, in the electric lamp lighting device 10, the current flowing into the LED module 20 can be made constant by the leakage inductance of the secondary winding N2 of the transformer T1. Therefore, in the electric lamp lighting device 10, the current flowing into the LED module 20 can be stabilized, and the flicker of the light output of the LED module 20 can be suppressed. Further, in the electric lamp lighting device 10, the feedback circuit for reducing the current flowing into the LED module 20 is not required, and the size of the electric lamp lighting device 10 can be reduced.

Further, in the electric lamp lighting device 10, the current flowing into the LED module 20 can be further constant current by appropriately adjusting the frequency or pulse width of the control signal output from the control circuit 5.

In the DC-DC voltage converter 3, when the switching element Q1 is in an on state, magnetic energy is stored in the inductor L1. Further, in the DC-DC voltage converter 3, after the switching element Q1 is turned off from the on state, the magnetic energy stored in the inductor L1 causes a counter electromotive force between both ends of the inductor L1. As a result, in the electric lamp lighting device 10 of the present embodiment, the voltage that is full-wave rectified by the first rectifying circuit 2 can be boosted. In other words, in the electric lamp lighting device 10, the inductance L1 can boost the voltage that is full-wave rectified by the first rectifying circuit 2. In other words, in the electric lamp lighting device 10, the inductance L1 boosts the voltage that has been full-wave rectified by the first rectifying circuit 2, and the voltage applied to the capacitor C2 increases.

Further, when the capacitance of the capacitor C2 is set to C and the voltage applied to the capacitor C2 is set to V, the electric energy E stored in the capacitor C2 can be obtained by the following equation.

In the electric lamp lighting device 10 of the present embodiment, it is understood from the above formula (1) that the capacitance C of the capacitor C2 can be reduced by increasing the voltage V applied to the capacitor C2. Thereby, in the electric lamp lighting device 10, for example, a film capacitor can be used as the capacitor C2, and reliability can be improved as compared with the case where the electrolytic capacitor is used as the capacitor C2.

Further, in the electric lamp lighting device 10, since the inductance L1 can boost the voltage that is full-wave rectified by the first rectifying circuit 2, the voltage in the low voltage region can be boosted. As a result, in the electric lamp lighting device 10, the electrolytic capacitors that smooth the voltage that is full-wave rectified by the first rectifying circuit 2 are not required between the pair of output ends 2a and 2b of the first rectifying circuit 2.

Further, in the electric lamp lighting device 10 of the present embodiment, the leakage inductance of the primary winding N1 of the transformer T1 and the capacitor C3 correspond to the parallel resonant circuit. Thereby, in the electric lamp lighting device 10, when the control circuit 5 controls the ON/OFF of the switching element Q1, the soft switching operation can be realized, and the switching loss of the switching element Q1 can be reduced. Therefore, in the electric lamp lighting device 10 of the present embodiment, the electric power loss of the electric lighting device 10 can be reduced, and the electric lamp lighting device 10 can be made more efficient. The soft switching operation refers to an operation in which the switching element Q1 is turned on or off when the current flowing into the switching element Q1 or the voltage applied to the switching element Q1 is zero by the resonance phenomenon of the resonant circuit.

The electric lamp lighting device 10 of the present embodiment described above includes the first rectifying circuit 2 that performs full-wave rectification of the AC voltage, and the DC-DC voltage converter 3 that rectifies the entire wave via the first rectifying circuit 2. The voltage is converted to a predetermined DC voltage. The DC-DC voltage converter 3 includes a first inductor L1, a first diode D1, a first capacitor C1 and a second capacitor C2, a transformer T1 including a primary coil N1 and a secondary coil N2, a switching element Q1, and a control circuit. 5, the switching element Q1 is turned on and off; and the second rectifying circuit 4 performs full-wave rectification on the voltage generated in the secondary coil N2. The second rectifier circuit 4 includes a second diode D2 and a third diode D3. The input side of the first rectifier circuit 2 is provided with a filter 1 for removing noise generated in the DC-DC voltage converter 3. The secondary coil N2 is provided with a center tap. Pairs of the first rectifier circuit 2 The first output terminal 2a of the output terminals 2a and 2b is connected to the anode side of the first diode D1 via the first inductor L1. The cathode side of the first diode D1 is connected to the first main terminal of the switching element Q1 via the primary coil N1. The first main terminal of the switching element Q1 is connected to the anode side of the first diode D1 via the first capacitor C1. The second main terminal of the switching element Q1 is connected to the second output terminal 2b of the pair of output terminals 2a and 2b of the first rectifier circuit 2, and is connected to the cathode of the first diode D1 via the second capacitor C2. side. The control terminal of the switching element Q1 is connected to the control circuit 5. The first end of the secondary coil N2 is connected to the anode side of the second diode D2. The cathode side of the second diode D2 is connected to the cathode side of the third diode D3. The anode side of the third diode D3 is connected to the second end of the secondary coil N2. The electric lamp lighting device 10 is configured to electrically connect the load (LED module 20) to the cathode side of each of the second diode D2 and the third diode D3, and to the center of the secondary coil N2. Between taps.

Therefore, since the electric lamp lighting device 10 of the present embodiment is configured by the filter 1, the first rectifying circuit 2, and the DC-DC voltage converter 3, the switching power supply device having the configuration shown in Fig. 14 is provided. In terms of miniaturization. Further, in the electric lamp lighting device 10, for example, a film capacitor can be used as the capacitor C2, and in the case where an electrolytic capacitor is connected between the output terminals of the rectifier circuit in a conventional manner, it is possible to achieve reliability even if miniaturization is achieved. Degree improvement.

An example of a lighting fixture using the electric lamp lighting device 10 of the present embodiment will be described below with reference to Fig. 3 .

The lighting fixture 30 of the present embodiment is configured to be embedded in the top plate material 40, for example. The lighting fixture 30 includes the LED module 20, the electric lamp lighting device 10, and the casing 31.

The LED module 20 includes a plurality of the LED elements 21 and the mounting substrate 22 described above.

As the mounting substrate 22, for example, a metal base printed circuit board or the like can be used. In the present embodiment, the outer peripheral shape of the mounting substrate 22 is set to, for example, a circular shape.

A plurality of LED elements 21 are mounted on one surface side (the bottom surface side in FIG. 3) of the mounting substrate 22. The mounting substrate 22 is electrically connected to the first connector 41b via the pair of first connecting wires 25 and 25.

The casing 31 is formed in a box shape (in the present embodiment, a rectangular box shape). As the material of the frame 31, for example, a metal (for example, iron, aluminum, stainless steel, or the like) or the like can be used. The housing 31 houses the above-described electric lamp lighting device 10.

In the lighting fixture 30, the casing 31 is disposed on one surface side (the top surface side in FIG. 3) of the top plate material 40. Further, in the lighting fixture 30, a spacer 32 is interposed between the casing 31 and the top plate material 40 for maintaining a predetermined distance between the casing 31 and the top plate material 40.

A side wall (left side wall in FIG. 3) of the casing 31 is formed with a first lead-out hole (not shown) for guiding a pair of second connecting wires 33 electrically connected to the electric lamp lighting device 10, 33. In the lighting fixture 30, one of the pair of second connecting wires 33 and 33 is connected to the cathode side of each of the diode D2 and the diode D3 of the electric lamp lighting device 10. Further, in the lighting fixture 30, the other of the pair of second connecting wires 33, 33 is connected to the center tap of the secondary coil N2 of the electric lamp lighting device 10. Further, in the lighting fixture 30, the electric lamp lighting device 10 is electrically connected to the second connector 41a via the pair of second connecting wires 33 and 33.

Further, the lighting fixture 30 includes an appliance body 23 and a light diffusing plate 24.

The luminaire main body 23 is formed, for example, in a bottomed cylindrical shape (in the present embodiment, a bottomed cylindrical shape). As the material of the fixture body 23, for example, a metal (for example, iron, aluminum, stainless steel, etc.) or the like can be used.

The bottom wall 23a of the luminaire main body 23 is formed with a second lead-out hole (not shown) for guiding the pair of first connecting wires 25 and 25 electrically connected to the mounting substrate 22. Further, in the present embodiment, the planar size of the mounting substrate 22 is set to be slightly smaller than the opening size of the fixture body 23.

In the lighting fixture 30, the mounting substrate 22 is disposed inside the bottom wall 23a of the fixture body 23. Further, in the lighting fixture 30, the mounting substrate 22 is attached to the bottom wall 23a of the fixture body 23. In the lighting fixture 30, for example, a bonding plate (not shown) having electrical insulating properties and thermal conductivity is used as a mechanism for attaching the mounting substrate 22 to the bottom wall 23a of the fixture body 23.

The lower end portion of the side wall 23b of the luminaire main body 23 is provided with a dam portion 23c extending to the side. Further, the lower end portion of the side wall 23b of the luminaire main body 23 is provided with a pair of attachment members (not shown) which can be sandwiched by the dam portion 23c with respect to the peripheral portion of the burying hole 40a formed in advance on the top plate material 40. In the lighting fixture 30, the peripheral portion of the embedded hole 40a of the top plate material 40 is sandwiched between the pair of mounting members and the crotch portion 23c, and the device body 23 can be embedded in the top plate material 40.

The light diffusion plate 24 is formed, for example, in a plate shape (in the present embodiment, a disk shape). As the material of the light diffusing plate 24, a light transmissive material (for example, an acrylic resin, glass, or the like) may be used. In the lighting fixture 30, the appliance The lower end portion of the side wall 23b of the main body 23 is detachably attached to the light diffusing plate 24. Thereby, the light diffusing plate 24 can cover the opening of the luminaire main body 23, and can diffuse the light emitted from each LED element 21.

The illuminating device 30 of the present embodiment described above includes the LED module 20, the luminaire main body 23 to which the LED module 20 is mounted, and the electric lamp lighting device 10 to illuminate the LED module 20. As a result, in the lighting fixture 30 of the present embodiment, reliability can be improved even if miniaturization is achieved. The respective configurations of the LED module 20 and the lighting fixture 30 are not particularly limited.

(Embodiment 2)

The basic configuration of the electric lamp lighting device 11 of the present embodiment is the same as that of the electric lamp lighting device 10 of the first embodiment, and as shown in FIG. 4, it differs from the first embodiment in the following points: the diode D2 and the diode. The cathode side of each of D3 is connected to the first end of the inductor (second inductor) L2. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and their description will be appropriately omitted.

In the electric lamp lighting device 11, the anode side of the LED module 20 is connected to the second end of the inductor L2. Further, in the electric lamp lighting device 11, the cathode side of the LED module 20 is connected to the center tap of the secondary coil N2. In summary, the electric lamp lighting device 11 is configured to electrically connect the LED module 20 between the second end of the inductor L2 and the center tap of the secondary coil N2. Thereby, the electric lamp lighting device 11 can illuminate the LED module 20.

In the electric lamp lighting device 11, since the inductance L2 smoothes the current flowing into the LED module 20, the chopping component contained in the current flowing into the LED module 20 can be reduced. Thereby, in the electric lamp lighting device 11 In the case of the lamp lighting device 10, the output current of the DC-DC voltage converter 3 can be suppressed (see FIG. 5), and the current flowing into the LED module 20 can be made constant.

Further, the electric lighting device 11 of the present embodiment can also be used for the lighting fixture 30 described in the first embodiment.

(Embodiment 3)

The basic configuration of the electric lamp lighting device 12 of the present embodiment is the same as that of the electric lamp lighting device 11 of the second embodiment. As shown in Fig. 6, the second embodiment differs from the second embodiment in the following points: the diode D2 and the diode. The cathode side of each of D3 is connected to the center tap of the secondary coil N2 via the inductor L2 and the capacitor (fourth capacitor) C4. In the present embodiment, the same components as those in the second embodiment are denoted by the same reference numerals, and their description will be appropriately omitted.

In the electric lamp lighting device 12, the anode side of the LED module 20 is connected to the connection point P1 of the inductor L2 and the capacitor C4. Further, in the electric lamp lighting device 12, the cathode side of the LED module 20 is connected to the center tap of the secondary coil N2. In summary, the lamp lighting device 12 is configured to electrically connect the LED module 20 to the connection point P1 of the inductor L2 and the capacitor C4 and to the center tap of the secondary coil N2. Thereby, the electric lamp lighting device 12 can illuminate the LED module 20.

As the capacitor C4, for example, a film capacitor can be employed. Thereby, in the electric lamp lighting device 12, the high frequency component contained in the current flowing into the LED module 20 can be removed (refer FIG. 7).

Further, the electric lamp lighting device 12 of the present embodiment can be used for the lighting fixture 30 described in the first embodiment.

(Embodiment 4)

The basic configuration of the electric lamp lighting device 13 of the present embodiment is the same as that of the electric lamp lighting device 12 of the third embodiment. As shown in Fig. 8, the difference between the control point 5 and the capacitor C2 is different at the following points and the like. The potential side is electrically connected. In the present embodiment, the same components as those in the third embodiment are denoted by the same reference numerals, and their description will be appropriately omitted.

The control circuit 5 includes a first detector (not shown) that detects the voltage across the capacitor C2. For the first detector, for example, an A/D conversion circuit (not shown) provided in advance in the microcomputer corresponding to the control circuit 5 can be employed. In the electric lamp lighting device 13, the first detector is electrically connected to the high potential side of the capacitor C2.

Further, the control circuit 5 is configured to control the on-time of the switching element Q1 in accordance with the increase or decrease of the voltage across the capacitor C2 detected by the first detector in order to satisfy the following Table 1. In the electric lamp lighting device 13, the off time of the switching element Q1 is set to a fixed time.

The control circuit 5 is configured to satisfy the following Table 1 and shorten the on-time of the switching element Q1 in accordance with an increase in voltage across the capacitor C2 detected by the first detector. Further, the control circuit 5 is configured to satisfy the following Table 1 and to lengthen the on-time of the switching element Q1 in accordance with the voltage decrease across the capacitor C2 detected by the first detector. Here, "area 0 to region 9" in Table 1 is a region in which the voltage range between the maximum value V _C2max and the minimum value V _C2min of the voltage across the capacitor C2 is divided into 10 regions as shown in FIG. Further, as shown in FIG. 9, the "region 6" of Table 1 is set to include an average value of the maximum value V _C2max and the minimum value V _{C2min among} the voltages across the capacitor C2. In addition, the "change ratio of the on-time" in Table 1 indicates the relative value based on the on-time of the switching element Q1 (hereinafter referred to as "reference on-time") when the voltage across the capacitor C2 is in the region 6. In addition, the "amount of change in the on-time" in Table 1 indicates the amount by which the on-time of the switching element Q1 changes with reference to the reference on-time. Further, "α" in Table 1 indicates the minimum on-time of the switching element Q1. In the present embodiment, the reference ON time of the switching element Q1 is set to 4α, but the present invention is not limited thereto, and may be 4α or more.

As is clear from FIG. 9 and Table 1, the control circuit 5 shortens the on-time of the switching element Q1 in accordance with an increase in the voltage across the capacitor C2. Further, as is clear from FIG. 9 and Table 1, the control circuit 5 lengthens the conduction time of the switching element Q1 in accordance with the decrease in the voltage across the capacitor C2. Thereby, in the electric lamp lighting device 13, the current flowing into the LED module 20 can be made constant current. Therefore, in the electric lamp lighting device 13, the current flowing into the LED module 20 can be made more constant than the electric lamp lighting device 12 (refer to FIG. 10).

Further, the electric lighting device 13 of the present embodiment can be used for the lighting fixture 30 described in the first embodiment.

(Embodiment 5)

The basic configuration of the electric lamp lighting device 14 of the present embodiment is the same as that of the electric lamp lighting device 13 of the fourth embodiment. As shown in Fig. 11, the following points are different from the fourth embodiment in that the input side of the filter 1 is connected. A dimmer 6 indicating the output voltage of the DC-DC voltage converter 3. In the present embodiment, the same components as those in the fourth embodiment are denoted by the same reference numerals, and their description will be appropriately omitted.

The dimmer 6 is a device for dimming and lighting the LED module 20. As the dimmer 6, for example, a dimmer using a triac (not shown) can be employed.

Further, the dimmer 6 is configured to output, for example, a voltage having a voltage waveform as shown in FIG. 12A so that the LED module 20 has a desired light output level (hereinafter referred to as "dimming level").

The input side of the filter 1 is electrically connected to a series circuit of the above-described bidirectional triode of the dimmer 6 and a commercially available electric power source Va.

The control circuit 5 is electrically connected to the output side of the filter 1.

Further, the control circuit 5 includes a second detector (not shown) that detects an instruction from the dimmer 6. For the second detector, for example, a zero crossing point detecting circuit (not shown) provided in advance in the microcomputer corresponding to the control circuit 5 can be employed. The second detector can detect the indication (dimming level) from the dimmer 6 by detecting the phase of the output voltage of the dimmer 6. In the electric lamp lighting device 14, the second detector is electrically connected to the output side of the filter 1.

Further, the control circuit 5 is configured to control the dimming level of the LED module 20 in accordance with an instruction from the dimmer 6 detected by the second detector. In other words, the control circuit 5 is configured to control the on-time of the switching element Q1 in response to an instruction from the dimmer 6 detected by the second detector. In the electric lamp lighting device 14, the off time of the switching element Q1 is set to a fixed time.

The control circuit 5 is configured to control the duty ratio of the switching element Q1 in accordance with the dimming level of the dimmer 6 in the manner shown by the solid line in FIG. In addition, L _{max in} Fig. 13 indicates the maximum value of the dimming level. Further, L _{min in} Fig. 13 indicates the minimum value of the dimming level.

The control circuit 5 is configured to control the on-time of the switching element Q1 in accordance with an instruction from the dimmer 6 in a manner to satisfy the characteristics shown by the solid line in FIG. Thereby, in the electric lamp lighting device 14, The dimming level of the LED module 20 can be adjusted by changing the output voltage of the DC-DC voltage converter 3. In addition, the single-dot chain line in FIG. 13 indicates the target value of the duty ratio of the switching element Q1 with respect to the dimming level of the dimmer 6.

Moreover, the control circuit 5 may be configured to shorten the on-time of the switching element Q1 as the voltage across the capacitor C2 detected by the first detector increases, and lengthen the switching element according to the voltage reduction across the capacitor C2. The on time of Q1. Specifically, the control circuit 5 may be configured to satisfy the following Table 2, according to the increase and decrease of the voltage across the capacitor C2 detected by the first detector, and through the second detection. The phase of the output voltage of the dimmer 6 detected by the device controls the on-time of the switching element Q1. Here, "area 0 to region 9" in Table 2 is a region in which the voltage range between the maximum value V _C2max and the minimum value V _C2min of the voltage across the capacitor C2 is divided into 10 regions as shown in FIG. Further, the "region 6" of Table 2 is set to include an average value of the maximum value V _C2max and the minimum value V _{C2min among} the voltages across the capacitor C2 as shown in FIG. In addition, the "change ratio of the on-time" in Table 2 indicates the relative value based on the reference on-time. In addition, the "amount of change in the on-time" in Table 2 indicates the amount by which the on-time of the switching element Q1 changes with reference to the reference on-time. Further, "α" in Table 2 indicates the minimum on time of the switching element Q1. Further, "β" in Table 2 indicates the on-time of the switching element Q1 set via the instruction (dimming level) from the dimmer 6. In the electric lamp lighting device 14, the reference ON time of the switching element Q1 is set to 4α, but the present invention is not limited thereto, and may be 4α or more. Further, "β" in Table 2 can be changed by an instruction from the dimmer 6.

(Table 2)

The control circuit 5 is configured to satisfy the method of Table 2, according to the increase and decrease of the voltage across the capacitor C2 detected by the first detector, and the dimmer 6 detected by the second detector. The phase of the output voltage is controlled for the on-time of the switching element Q1. Thereby, in the electric lamp lighting device 14, the dimming level of the LED module 20 can be adjusted, and the current flowing into the LED module 20 can be made constant current (refer to FIG. 12B).

Further, the electric lighting device 14 of the present embodiment can be used for the lighting fixture 30 described in the first embodiment.

The present invention has been described in terms of several preferred embodiments, and various modifications and variations can be made without departing from the spirit and scope of the invention.

1‧‧‧ filter

2‧‧‧1st rectifier circuit

2a, 2b‧‧‧ output

3‧‧‧DC/DC voltage converter

4‧‧‧2nd rectifier circuit

5‧‧‧Control circuit

10‧‧‧Lighting device

20‧‧‧LED module

21‧‧‧LED components

C1, C1, C3‧‧‧ capacitors

D1, D2, D3‧‧‧ diode

L1‧‧‧Inductance

N1‧‧‧ primary coil

N2‧‧2nd coil

Q1‧‧‧Switching components

T1‧‧‧ transformer

Va‧‧‧ commercial power supply

Claims (7)

An electric lamp lighting device comprising: a first rectifying circuit that performs full-wave rectification on an alternating current voltage; and a DC-DC voltage converter that converts a full-wave rectified voltage via the first rectifying circuit into a predetermined direct current a voltage; and the DC-DC voltage converter includes: a first inductor; a first diode; a first capacitor and a second capacitor; a transformer having a primary coil and a secondary coil; a switching element; a control circuit, the switching element The second rectifier circuit includes a second diode and a third diode, the first rectifier circuit The input side is provided with: a filter for removing noise generated in the DC-DC voltage converter; and the secondary coil is provided with a center tap, and the pair of output ends of the first rectifier circuit The first output end is connected to the anode side of the first diode via the first inductor, and the cathode side of the first diode is connected to the first main terminal of the switching element via the primary coil The first main terminal of the switching element Connected to the anode side of the first diode via the first capacitor, the second main terminal of the switching element is connected to the second output end of the pair of output ends of the first rectifier circuit, And connected to the cathode side of the first diode via the second capacitor, wherein a control terminal of the switching element is connected to the control circuit. The first end of the secondary coil is connected to the anode side of the second diode, and the cathode side of the second diode is connected to the cathode side of the third diode, and the third diode is The anode side is connected to the second end of the secondary coil, and is configured to electrically connect the light-emitting object to the cathode side of the second diode and the third diode, and the center Between taps. The electric lamp lighting device of claim 1, wherein a gap is provided between the primary coil and the secondary coil, and a third capacitor is connected in parallel to the primary coil. The electric lamp lighting device of claim 1 or 2, wherein the cathode side of each of the second diode and the third diode is connected to the first end of the second inductor, and is configured to be capable of The load is electrically connected between the second end of the second inductor and the center tap. The electric lamp lighting device of claim 3, wherein the cathode side of each of the second diode and the third diode is connected to the center tap via the second inductor and the fourth capacitor. And configured to electrically connect the load to the connection point between the second inductor and the fourth capacitor, and to the center tap. For example, the electric lamp lighting device of claim 4, wherein The control circuit is configured to shorten the on-time of the switching element as the voltage across the second capacitor increases, and to lengthen the on-time of the switching element in accordance with a decrease in voltage across the second capacitor. The electric lamp lighting device of claim 4, wherein the input side of the filter is connected to a dimmer indicating an output voltage of the DC-DC voltage converter, and the control circuit is configured to The indication of the dimmer controls the conduction time of the switching element. A lighting fixture, comprising: an LED module; an appliance body, the LED module is mounted; and the electric lamp lighting device according to any one of claims 1 to 6, the LED module is used as The load is illuminated.