JP2009105355A - Led lighting equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an LED lighting fixture having a simple structure using a fluorescent lamp type lighting fixture. <P>SOLUTION: The LED lighting fixture includes: a power supply side circuit 31 in which current supplied from an alternating-current power supply 20 and restricted at least by a choke coil 22 flows; a base terminal 28 connectable with the power supply side circuit 31; a tube 2 having the base terminal 28 at both ends; a full-wave rectifier circuit 29 to which power whose current is restricted by the choke coil 22 is supplied from the base terminal 28 and which full-wave rectifies it as a tube side circuit 32 of the tube 2; a plurality of LEDs 30 connected to both ends of the full-wave rectifier circuit 29; and a printed-circuit board 4 which mounts the plurality of LEDs 30 and the full-wave rectifier circuit 29 and which is provided in the tube 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an LED lighting fixture compatible with a fluorescent lamp.

  Conventionally, there is a decorative lamp in which a large number of light-emitting diodes (LEDs) are arranged on a printed circuit board and arranged in a tubular bulb (hereinafter referred to as a tube), which has the same shape as a conventional fluorescent lamp (Patent Document) 1).

However, such a conventional decorative lamp requires a design in which a current limiting resistor is individually installed on the tube side of the lighting fixture in relation to the rated current in connection with a normal fluorescent lamp type lighting fixture.
Moreover, what controls the ignition of a thyristor and controls the electric current which flows into LED is disclosed (patent document 2).
However, there is a disadvantage that the control circuit becomes complicated for accurate control within a narrow firing angle.
Japanese Utility Model Publication No. 61-112392 JP 2006-270007 A

  The LED lighting apparatus according to the present invention is made to eliminate the above-described drawbacks, and an LED having a simple configuration in which a normal fluorescent lamp type lighting apparatus is diverted and an AC power source is full-wave rectified in a tube. A lighting apparatus is provided.

  An LED lighting apparatus according to the present invention includes a power supply side circuit through which an electric current supplied from an AC power supply and at least a current limited by a choke coil flows, a base terminal connectable to the power supply side circuit, and a tube having the base terminal at both ends. And the tube side circuit of this tube is connected to both ends of the full-wave rectifier circuit, and a full-wave rectifier circuit that supplies the current limited by the choke coil from the base terminal to full-wave rectify it. The plurality of LEDs, and the plurality of LEDs, and a printed circuit board on which the full-wave rectifier circuit is mounted and installed inside the tube body are characterized in that it is configured.

  According to the LED lighting apparatus according to the present invention, the conventional fluorescent lamp type lighting apparatus can be diverted, and a plurality of LEDs in the tube are lit with a pulsating flow by full-wave rectification, so that the temperature rise is small, energy saving and extremely It is possible to obtain an LED lighting apparatus that can be driven with a simple configuration, does not require a control circuit using a complicated thyristor, and does not require a large-capacity smoothing capacitor.

  It is assumed that the LED lighting device has a base terminal that can be connected to a normal fluorescent lamp type lighting device, and a tube side circuit for lighting the LED in the tube body is built in the printed board.

  FIG. 1 is a perspective view of a tube portion of an LED lighting apparatus according to the present invention. In FIG. 1, 1 is a base having the same dimensions as a conventional fluorescent lamp, 2 has a base at both ends, and has a substantially circular cross section. LEDs 4 and 4 are printed circuit boards incorporating a full-wave rectifier circuit and a plurality of LEDs 3.

  1 is a configuration in which a tube body 2 as shown in FIG. In other words, a predetermined voltage and current are applied to the base terminal of the base 1 from a commercial AC power source, and full-wave rectified by a full-wave rectifier circuit formed on the printed circuit board 4 and connected in series as a pulsating current. A predetermined current is supplied to each LED 3 to light each LED 3.

  FIG. 2 is a circuit diagram for explaining the operation and action of the first embodiment. In FIG. 2, 20 is a commercial AC power source supplied from the outside, 21 is an on / off switch for lighting, 22 is a choke coil for limiting the current flowing to the LED, and 23 is a transformer for voltage step-up or pressure reduction to a predetermined value. , 24 is a capacitor, 25 is a resistor, 26 is a capacitor, 27 is an output terminal of the power supply side circuit, 28 is a base terminal to be a power supply input terminal of the tube side circuit, 29 is a full-wave rectifier circuit, and 30 is a plurality of lighting Each LED, 31 is a power supply side circuit composed of the choco coil 22 and the like, and 32 is a tube side circuit composed of a full-wave rectification circuit 29 and a printed circuit board 3 composed of a plurality of LEDs 30.

  For example, in the case of the conventional glow lamp type power supply side circuit 31, the choke coil in the conventional fluorescent lamp type lighting fixture can be used, and it can be used only by removing the glow lamp. Further, the specification and quantity of the LED 30 of the tube side circuit 32 are configured according to the output of the output terminal 27 of the power source side circuit 31.

Therefore, in the first embodiment, even in the rapid type as shown in FIG. 2, the choke coil 22 is used for current limitation and the other capacitors 24 and 26 may remain connected.
The tube-side circuit 32 is also connected in series with a full-wave rectifier circuit 29 and a plurality of LEDs 30 necessary for obtaining the same illuminance as a conventional fluorescent lamp. Now that the reliability of individual LEDs has increased, it is possible to light up for a sufficiently long time even in series connection, and in order to simplify the configuration, it may be simply connected in series.

FIG. 3 is a voltage waveform diagram of the LED lighting apparatus according to the first embodiment.
In FIG. 3, the vertical axis represents the voltage waveform between both terminals of one LED among the LEDs 30 connected in series, and the horizontal axis represents time [ms]. In the case of the LED used in the first embodiment, the voltage exceeds 3.0 V. The portion where the current effective for light emission flows.
Therefore, although intermittent lighting is performed at a cycle of about 8 ms by full-wave rectification, even a pulsating flow that is not smoothed by a smoothing capacitor at the subsequent stage of the full-wave rectification circuit can be practically used visually.

The LED used was one whose forward current was extremely reduced when the forward voltage was 3.0 V or less, and a normal 40 W fluorescent lamp type lighting fixture was used as the power supply side circuit 31.
The terminal voltage of the fluorescent lamp of the 40W fluorescent lamp type lighting fixture is boosted by 100V by the boosting transformer 23 to about 216V. The current flowing from the terminal voltage to the LED 30 is determined by the impedance of the choke coil 22 used as a ballast.

  The full-wave rectification is performed by the full-wave rectification circuit 29 built in the printed circuit board 4 in the tube body 2 from the output terminal 27 of the power supply side circuit 31. However, since the flicker is conspicuous in the half-wave rectification, full-wave rectification is preferable.

  The waveform obtained by using this full-wave rectified voltage, that is, the pulsating voltage as the driving power source of the tube-side circuit 32 is a pulsating voltage having a pulsating waveform as shown in FIG. The value is about 308 VDC.

Now, assuming that the number of LEDs connected in series is 64, 64 × 3.0V = 192V, and when 64 × 3.3V = 212V or more, a current of 100 mA or more flows.
That is, in a portion where the full-wave rectified pulsating voltage is lower than 192 V, the forward current is extremely reduced and the power consumption is also reduced in proportion.

FIG. 4 is a current waveform diagram of the LED lighting apparatus according to the first embodiment.
In FIG. 4, it is the wave form diagram which connected resistance of 10 ohms in series in the LED series circuit of a tube side circuit, and measured the both-ends voltage. Therefore, one scale = 100 mA.
The specification of the LED of Example 1 has a maximum forward current of 350 mA, a standard of 150 mA, a maximum of 180 mA, and an average of 80 mA. As a result, the generation of heat is suppressed, and the LED alone effectively works to prolong the life.

  According to the first embodiment, a tube as an LED light source can be used in place of a conventional fluorescent lamp type lighting fixture, and the LED lighting fixture is diverted by using the already installed fluorescent lamp type lighting fixture. Therefore, it is possible to obtain a long-life and energy-saving lighting fixture with an extremely simple configuration.

  The LED lighting apparatus according to the present invention uses the power supply side circuit in which the fluorescent lamp has been installed so far, and uses the tube body including the tube side circuit so that the change point is extremely small, so that energy saving and long life can be achieved. Because it is a lighting fixture, it will greatly contribute to the development of the building management industry.

It is a perspective view of the LED lighting fixture which concerns on Example 1. FIG. It is a circuit diagram of the LED lighting fixture which concerns on Example 1. FIG. FIG. 3 is a voltage waveform diagram according to the first embodiment. FIG. 3 is a current waveform diagram according to the first embodiment.

Explanation of symbols

1 Base 2 Tube 3 LED
4 Printed circuit board 20 AC power supply 21 Switch 22 Choke coil 28 Base terminal 29 Full-wave rectifier circuit 30 LED
31 Power supply side circuit 32 Tube side circuit

Claims (1)

  A power supply side circuit through which an electric current supplied from an AC power source and at least current limited by a choke coil flows, a base terminal that can be connected to the power supply side circuit, a pipe body having the base terminal at both ends, and a pipe side of the pipe body The circuit includes a full-wave rectifier circuit in which a power source limited in current by the choke coil is supplied from the base terminal and performs full-wave rectification thereof, a plurality of LEDs connected to both ends of the full-wave rectifier circuit, and these An LED lighting apparatus comprising a plurality of LEDs and a printed circuit board mounted with the full-wave rectifier circuit and installed inside the tubular body.

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