JPH0576061U - Light emitting diode lighting circuit and tube light safety lamp using this circuit - Google Patents

Abstract

(57) [Abstract] [Purpose] In a light-emitting diode lighting circuit that uses an AC power supply as an input, it is intended to achieve miniaturization, high reliability, and long life without using a voltage drop transformer or series resistor. [Structure] A capacitor was inserted in series on the AC input side of the rectifier circuit, and the capacity of this capacitor was set to a value at which a desired rectified output current value was obtained.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a light emitting diode lighting circuit and a tube light safety lamp using this circuit.

[0002]

[Prior Art]

 A conventional tubelight security light using a light emitting diode is a light-transmissive synthetic resin in which two light emitting diode series bodies in each of which more than ten light emitting diodes are connected in series are placed so that the light emitting diodes are located at positions intermediate to each other. Two wires, which are housed in a tube and connected to an outlet for supplying a commercial AC power supply to a tube light safety lamp connected to the next stage, are installed inside the tube to make both ends watertight. The two LEDs connected in series have a transformer that decompresses the AC power supply, a rectifier, and a switch circuit that switches the power supply to the two LEDs in series at regular intervals to alternately emit light. It is configured to supply power via the built-in controller.

In a controller that does not use a transformer for voltage reduction, a series resistor for voltage drop is inserted on the rectified output side so that a desired energization current value can be obtained.

[0004]

[Problems to be solved by the device]

 In a conventional tubelight security lamp that uses a light-emitting diode as a light source, the controller and the tubelight are separate bodies, which complicates the structure for water-tight sealing, which is one of the reasons for the high cost.

Further, in the case where the controller is provided with a transformer for pressure reduction, the controller is large and heavy, which makes it inconvenient to handle.

Further, in the case of using a resistor for voltage drop, there is a problem in that the life of the resistor becomes short because the temperature of the surrounding becomes high due to the heat generation of the resistor and the deterioration of the synthetic resin tube or the like is promoted. It was

The present invention has been made for the purpose of solving the above problems, and a series of light emitting diodes is used without using a depressurizing transformer or a voltage dropping resistor and without generating heat or the like. The purpose is to obtain a light emitting diode lighting circuit that can light up the body.

Another object of the present invention is to obtain a tubelight security lamp using the above lighting circuit.

[0009]

[Means for Solving the Problems]

 The light-emitting diode lighting circuit according to the present invention comprises a capacitor connected in series to the input side of a rectifying circuit that supplies a direct current to the light-emitting diode, and the capacity of this capacitor is set to a value at which a desired output current value can be obtained. It is characterized by being set.

Further, the tube light safety lamp according to the present invention is characterized in that a series body of a set of light emitting diodes is alternately turned on by using the light emitting diode lighting circuit.

[0011]

[Action]

 The light emitting diode lighting circuit according to the present invention can supply a current suitable for the light emitting diode connected to the DC output side by changing the capacitance value of the capacitor connected to the input side of the rectifier circuit. ..

Further, since the tube light safety lamp according to the present invention uses the above-mentioned lighting circuit, the controller can be housed in the synthetic resin tube together with the series body of the light emitting diodes, and the capacitor is the voltage drop of the conventional example. Since it does not generate heat like the resistance for use, the synthetic resin tube will not deteriorate.

[0013]

【Example】

 FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, in which 1 is an AC plug, 2 is a light-transmitting synthetic resin tube, 3 is a nonpolar capacitor, 4 is a rectifier circuit, 5 is a switch circuit, and 6 is light emission. Diodes 7a and 7b are first and second light emitting diode series bodies in which dozens of light emitting diodes are connected in series, 8a and 8b are caps, and 9 is a socket.

FIG. 2 is a specific circuit diagram of the embodiment shown in FIG. 1. The capacitor 3 is a 1.8 μF, 180 VAC metallized polyester film capacitor, C1, C2 and C3 are 20 μF, 50 WV chemical capacitors, R1, R2 is a resistance of 470 KΩ, R3 and R4 is 10 KΩ, Q1 and Q2 are transistors, and 7a and 7b are 12 light emitting diodes in series.

In the above embodiment, the voltage at the output end of the rectifier circuit 4 is about 26 V and the output current is about 50 mA when the commercial 100 V AC power source is input, and the light emitting diode series body, 7a and 7b are switches. The circuit 5 alternately blinks at time intervals of about 40 times / minute.

In the above embodiment, a commercial 100 V AC is used as the input power source, but a portable AC generator may be used as the power source, and the capacity of the capacitor 3 may be switched according to the output voltage.

In the case of a portable AC power supply, it is desirable to provide a protection circuit according to the input power supply, such as a circuit for removing ripples in the input waveform.

Further, although the above-mentioned embodiment shows an example in which the present invention is applied to a tube light security lamp, it can be widely applied to a lighting circuit of a light emitting diode.

[0019]

[Effect of the device]

 According to the present invention, a light-emitting diode lighting circuit using an AC power supply as an input is provided with a capacitor inserted in series on the input side of the rectifying circuit, and the capacitance of this capacitor is set to a value at which a desired rectified output current value can be obtained. Since it is set to, the drive power supply circuit configuration is extremely simple, and the size and weight can be reduced, and since there is no problem such as heat generation, high reliability of the device and long life can be obtained. It is effective.

Further, since the light emitting diode lighting circuit is applied to the tube light safety lamp, the rectifier circuit, the switch circuit, etc. can be housed in the synthetic resin tube housing the light emitting diode series body, so that the structure is simplified and handled. This improves the waterproof property and eliminates the problem of synthetic resin tubes and caps deteriorating due to heat generation, resulting in a longer life.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a specific configuration of this embodiment.

[Explanation of symbols]

 3 Capacitor 4 Rectifier Circuit 5 Switch Circuit 6 Light Emitting Diode 7a Light Emitting Diode Series 7b Light Emitting Diode Series 8a Cap 8b Cap

Claims (2)

[Scope of utility model registration request] 1. A light emitting diode lighting circuit configured to use a commercial alternating current as a power source, and to supply a rectified output current to the light emitting diode to light the light emitting diode, in series with an alternating current input side of the rectified current. A light-emitting diode lighting circuit, comprising an inserted capacitor, wherein the capacitance value of the capacitor is selected so that the value of the current flowing through the light-emitting diode becomes a desired value. 2. A rectifier circuit in which a capacitor is connected in series to an AC input side, and a plurality of light emitting diodes connected in series, and a set of light emitting diode series bodies housed in a light-transmissive synthetic resin tube. And a switch circuit for alternately applying the output of the rectifying circuit to the set of light emitting diode series bodies at predetermined time intervals to light the tube light security lamp.