JP2013025872A - Fluorescent tube type led lamp and led lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce power consumption of a fluorescent tube type LED lamp and an LED lighting device.SOLUTION: A DC bus voltage of an inverter circuit 11 varies according to variation of a load. An LED module 12 is an LED lamp that is mounted to the inverter circuit 11 so that it can be exchanged with a fluorescent tube. An LED circuit 23 includes one or more light emitting diodes. An input terminal 20 is connected to the inverter circuit 11, and inputs power to be inputted to the LED circuit 23 from the inverter circuit 11. A rectifier circuit 22 rectifies a high frequency voltage outputted by the inverter circuit 11. An inductor 24 is inserted between the input terminal 20 and the LED circuit 23, for example, between the output of the rectifier circuit 22 and the LED circuit 23.

Description

  The present invention relates to a fluorescent lamp type LED lamp, and more particularly to a fluorescent lamp type LED lamp which can be used in place of a fluorescent lamp by being attached to a fluorescent lamp lighting device. The present invention also relates to an LED illumination device using such an LED lamp.

  In recent years, LED lighting devices using LEDs (light-emitting diodes) have attracted attention as low-power consumption and long-life lighting devices. Regarding illumination using LEDs, for example, Patent Document 1 describes a fluorescent lamp type LED lamp (LED module) having the same external shape as a normal fluorescent lamp. For example, a user removes a fluorescent lamp from an existing fluorescent lamp fixture, and replaces it with a fluorescent lamp type LED lamp. The fluorescent lamp type LED lamp includes a circuit for lighting the LED, and the light source can be changed to the LED while using the existing equipment as it is.

Japanese Utility Model Publication No. 6-54103

  FIG. 4 shows a circuit configuration example of an LED module that can be used by being connected to an inverter for a fluorescent lamp. The LED module 50 includes a filament equivalent circuit 51, a rectifier circuit 52, and an LED circuit 53. The LED circuit 53 includes, for example, a plurality of LEDs connected in series. Input from the inverter circuit 54 is input to the rectifier circuit 52 via the filament equivalent circuit 51, rectified by the rectifier circuit 52, and then supplied to the LED circuit 53. The filament equivalent circuit 51 may be omitted depending on the type of the inverter. The rectifier circuit 52 may be omitted depending on the configuration of the LED circuit 53.

  Here, the LED module 50 may be designed to be lit with lower power than when the fluorescent lamp is lit, for the purpose of aiming at an energy saving effect. For example, it is assumed that there is an illuminating device with power consumption of 20 W, the fluorescent lamp portion power is 16 W, and the lighting device loss is 4 W. At this time, if a fluorescent lamp type LED lamp designed so that electric power enters the LED module 50 instead of the fluorescent lamp is attached, the power consumption of the lighting device becomes 10 W + 4 W = 14 W. In this case, the power consumption of the lighting device can be reduced by 6 W compared to when using a fluorescent lamp (20 W).

  However, when the inverter circuit 54 is a circuit in which the DC bus voltage fluctuates in accordance with the fluctuation of the load (for example, many in the circuit format of the harmonic-compatible one converter), the power is lower than that of the fluorescent lamp as described above. When the LED module 50 designed to light up is used, the DC bus voltage on the inverter circuit 54 side rises when the LED module 50 is energized, and may exceed the rated voltage of the components constituting the inverter circuit 54. In order to avoid this, it has not been possible to design the LED module 50 to be lit at a very low power.

  In view of the above, the present invention provides a DC bus voltage even when an LED lamp designed to be lit with lower power than a fluorescent lamp is connected to an inverter circuit in which the DC bus voltage fluctuates in accordance with load fluctuations. An object of the present invention is to provide a fluorescent lamp type LED lamp and an LED lighting device that can suppress the rise of the LED.

  In order to achieve the above object, the present invention provides an inverter circuit in which a DC bus voltage fluctuates in accordance with a load variation, and an LED lamp that is attached to the inverter circuit in a manner that can be replaced with a fluorescent lamp. An LED circuit including a diode; an input terminal connected to the inverter circuit for inputting power to be input from the inverter circuit to the LED circuit; and an inductor inserted between the input terminal and the LED circuit. There is provided an LED lighting device comprising a fluorescent lamp type LED lamp.

  In the present invention, the inductor may be connected in series to the LED circuit.

  In the LED lighting device of the present invention, a configuration can be adopted in which the LED module is further connected to the input terminal, and further includes a rectifier circuit that rectifies the output of the inverter circuit and supplies the output to the LED circuit. The inductor can be inserted on the input side or output side of the rectifier circuit.

  The present invention is also a fluorescent lamp type LED lamp, comprising an LED circuit including one or more light-emitting diodes, an input terminal connected to an inverter circuit and for inputting power to be input to the LED circuit, and the input Provided is a fluorescent lamp type LED lamp including an inductor inserted between a terminal and the LED circuit.

  In the fluorescent lamp type LED lamp and the LED lighting device of the present invention, when the inductor is inserted between the input terminal and the LED circuit, the LED lamp is designed to be lit with lower power than the fluorescent lamp. However, it is possible to suppress an increase in the DC bus voltage of the inverter circuit in which the DC bus voltage varies according to the load variation. For this reason, the LED lamp can be designed to be lit with lower power, and the power consumption of the LED lamp can be further reduced.

The block diagram which shows the LED illuminating device containing the fluorescent lamp type LED lamp of one Embodiment of this invention. The block diagram which shows the LED illuminating device containing the fluorescent lamp type LED lamp of the modification of this invention. The block diagram which shows the LED lighting apparatus containing the fluorescent lamp type LED lamp of another modification of this invention. The block diagram which shows the structural example of the LED module which can be connected and used for the inverter for fluorescent lamps.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an LED lighting device including a fluorescent lamp type LED lamp according to an embodiment of the present invention. The LED lighting device 10 includes an inverter circuit 11 and an LED module (fluorescent lamp type LED lamp) 12. The LED module 12 includes a filament equivalent circuit 21, a rectifier circuit 22, an LED circuit 23, and an inductor 24. The LED module 12 is a fluorescent lamp type LED lamp, and can be used by replacing a normal fluorescent lamp attached to an existing fluorescent lamp illumination device.

  The inverter circuit 11 constitutes a lighting device for lighting a fluorescent lamp. The inverter circuit 11 is a type of inverter circuit in which the DC bus voltage varies according to the variation of the load. The inverter circuit 11 converts, for example, an input AC voltage of 50 Hz / 60 Hz into a high frequency voltage. For the inverter circuit 11, for example, a harmonic-compatible one converter is used. In the general two-converter method, one converter reduces the harmonics and the other converter generates a high-frequency voltage that turns on the lamp. On the other hand, the harmonic-compatible one converter uses the harmonics of the input current. It also serves as a switching operation that reduces distortion and a switching operation that creates a high-frequency voltage that turns on the lamp.

  The LED module 12 is connected to the inverter circuit 11 through the input terminal 20. The input terminal 20 receives the high frequency voltage output from the inverter circuit 11. The input from the inverter circuit 11 is input to the rectifier circuit 22 via the filament equivalent circuit 21. The filament equivalent circuit 21 can be omitted depending on the type of the inverter circuit 11. The rectifier circuit 22 rectifies the input high frequency power supply and supplies a DC voltage to the LED circuit 23. The LED circuit 23 includes one or more LEDs. The LED circuit 23 includes a plurality of LEDs connected in series / parallel, for example. The rectifying circuit 22 may be a rectifying / smoothing circuit that smoothes the output voltage. The rectifier circuit 22 may be omitted depending on the configuration of the LED circuit 23.

  The LED module 12 is designed to be lit with lower power than the power when the fluorescent lamp is lit. For example, it is designed to light at 23 W with respect to the electric power 37 W of the fluorescent lamp. When viewed from the inverter circuit 11 side, when power is supplied to the LED module 12, the load is reduced by the amount of power that is lower than when power is supplied to the fluorescent lamp.

  For example, in the case of the above numerical example, the lighting device including the inverter circuit 11 supplies power of 37 W to the load (fluorescent lamp) when the connected lamp is a fluorescent lamp, and when the connected lamp is the LED module 12 Supplies 23 W of power to the load (LED module 12). When the inverter circuit 11 is a harmonic compatible one-converter circuit, the reduced energy of 14 W is applied to the rise of the DC bus voltage, and as a result, the DC bus voltage rises.

  In order to prevent the DC bus voltage from rising, an inductor (inductance element) 24 is used. The inductor 24 is inserted in series with the load on the load side (output side) of the inverter circuit 11. More specifically, the inductor 24 is inserted into the power supply input line of the LED circuit 23 in series with the LED circuit 23. By inserting the inductor 24, even when the LED module 12 is designed to be lit at a lower power than a fluorescent lamp, the DC bus voltage can be reduced as compared with the case where the inductor 24 is not inserted. .

  The reason why the DC bus voltage decreases due to the insertion of the inductor 24 will be considered. There is a resonant circuit of L and C on the inverter circuit 11 side, and the resonant voltage is applied to a load (LED module or fluorescent lamp). By providing the inductor 24 in the LED module 12 on the load side of the inverter circuit 11, L is added to the L and C circuits of the inverter circuit 11, and the resonance condition changes. With this change in the resonance condition, it is considered that the DC bus voltage of the inverter circuit 11 becomes lower than when the inductor 24 is not provided.

  The position of the inductor 24 is not limited to the output side of the rectifier circuit 22. 2 and 3 show a modification. In FIG. 2, the inductor 24 is inserted on the input side of the rectifier circuit 22, that is, between the output of the filament equivalent circuit 21 and the input of the rectifier circuit 22. In FIG. 3, the inductor 24 is inserted between the portion for inputting the high-frequency voltage from the inverter circuit 11 and the filament equivalent circuit 21. When the inductor 24 is inserted at the position of the modification shown in FIGS. 2 and 3, the LED module is designed so that the inverter circuit 11 is lit with lower power than the fluorescent lamp as in the case of FIG. When 12 is connected, the DC bus voltage can be lowered as compared with the case where the inductor 24 is not inserted.

  In the present embodiment, an inductor 24 is inserted between the input terminal 20 of the LED module 12 and the LED circuit 23. Even when the LED module 12 designed to be lit with lower power than a fluorescent lamp is connected to the inverter circuit 11 in which the DC bus voltage fluctuates in accordance with the fluctuation of the load by inserting the inductor 24. It is possible to suppress an increase in the DC bus voltage on the inverter circuit 11 side when the LED module 12 is energized. By suppressing the rise in the DC bus voltage, even when the LED module 12 is designed to be lit at lower power, it is possible to avoid a situation where the output of the inverter circuit 11 exceeds the rated voltage of the inverter circuit component. The power consumption of the LED module 12 can be further reduced.

  As mentioned above, although this invention was demonstrated based on the suitable embodiment, the LED module and LED lighting apparatus of this invention are not limited only to the said embodiment, Various correction | amendment and the structure from the said embodiment are carried out. Changes are also included in the scope of the present invention.

10: LED lighting device 11: inverter circuit 12: LED module 21: filament equivalent circuit 22: rectifier circuit 23: LED circuit 24: inductor

Claims (4)

An inverter circuit in which the DC bus voltage fluctuates in accordance with load fluctuations;
An LED lamp that is attached to the inverter circuit in a replaceable manner with a fluorescent lamp, and includes an LED circuit including a plurality of light emitting diodes, and an electric power to be input from the inverter circuit to the LED circuit. An LED lighting device comprising: a fluorescent lamp type LED lamp having an input terminal and an inductor inserted between the input terminal and the LED circuit.   The fluorescent lamp type LED lamp according to claim 1, wherein the inductor is connected in series to the LED circuit.   The fluorescent lamp type LED lamp according to claim 1, further comprising a rectifier circuit connected to the input terminal and rectifying an output of the inverter circuit and supplying the rectified circuit to the LED circuit. A fluorescent lamp type LED lamp,
An LED circuit including a plurality of light emitting diodes;
An input terminal connected to an inverter circuit for inputting power to be input to the LED circuit;
A fluorescent lamp type LED lamp comprising an inductor inserted between the input terminal and the LED circuit.

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