JPS58215693A - Light emitting diode lighting system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a lighting power formula for light emitting diodes that sequentially lights up a plurality of light emitting diodes in accordance with the number of input pulses.

Conventionally, the lighting method of the light emitting diode of this pole was the first one.
What is shown in the figure is known. Figure 1 is a circuit diagram showing a conventional lighting method for light emitting diodes.

In Figure 1, l is a voltage supply point, 2 is a light emitting diode group composed of a plurality of light emitting diodes D1 to DN, and 3 is connected at one end to voltage supply point 1 and at the other end to light emitting diode group 2. It consists of multiple resistors R1 to RN.
A resistor group, 4 a shift register circuit consisting of flip-flops, 5 a plurality of transistors 'l''R1 to 'fR
The transistor group 6 is composed of N transistors, and 6 is an input terminal for inputting pulses to the shift register circuit 4. Also, Q, ~
QN and C indicate the output terminal and clock terminal of the shift register circuit 4. The light emitting diode group 2 may be composed of a plurality of light emitting diodes inverted,
The number of resistor groups 3 and transistor groups 5 equal to the number of light emitting diodes constituting the light emitting diode group 2 is required. Each of the output terminals Q1 to QN of the shift register circuit 4 is connected to the base of each of the transistors TRI to TRN, respectively, thereby controlling the lighting of each of the light emitting diodes D1 to DN.

Next, the operation shown in FIG. 1 will be explained. In the initial state, the shift register circuit 4 has its output terminals Q1 to Q.
N is at L level. Here, when one pulse is input from the input terminal 6 to the clock terminal C, the output terminal Q1 goes to I level, and then when two pulses are input, each output terminal Q1t Q,2 becomes 1. -(When the level is reached and there is an input of N pulses, each output terminal Q1 to QN is)
-It is a rubel. Now, when one pulse is input from the input terminal 6 to the clock terminal C, the output terminal Q1 of the shift register circuit 4 becomes a trubel, and the transistor! Transistor 'lI'R1 of hai5 is ON and l
f, 5T"Light-emitting diode of light diode group 2"
;ti It is biased in the Iin direction, so it lights up.

Next, when the C12th pulse is applied to the clock terminal C, the output terminal Q2 remains at the 14th level, and the light emitting diode j'+
2 light emitting diode I) 1, followed by 1, D2 lights up.

Similarly, when the Nth pulse is input to the clock terminal C, each light emitting diode from January to 1)N is IIF1.
Next, do a point tl. In other words, each light emitting diode IN-I of the light emitting diode group 2 corresponds to the number of input bulbs.
N lights up in sequence.

Since the lighting method of the conventional light-emitting timer is configured as described above, each of the light-emitting diodes 1) 1 to DN, which are the constituent elements of the light-emitting diode group 2, becomes as shown in FIG. In a prone position where a current flows and N lights are lit, N
Since the current of XI will flow, a large amount of current will be consumed. For example, if a current of about 10 mA is required to light up one light emitting diode, about 100 mA is required to light up 10 light emitting diodes, and the electric current connected to voltage supply point 1. The disadvantage was that the power source required had a large current capacity.

The present invention has been made to eliminate the drawbacks of the conventional ones as described above, and includes at least two or more light emitting diodes connected in series, a constant current source device for lighting each of the light emitting diodes, and a constant current source device for lighting each of the light emitting diodes. This light-emitting diode has a configuration comprising a Johnson counter circuit of binary or higher numbers for controlling the lighting operation of the light-emitting diode, and is capable of lighting each light-emitting diode in the 110th order with a very small quenching current. The purpose is to provide a lighting method.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 2 is a circuit configuration diagram showing a lighting system for a light emitting diode according to an embodiment of the present invention. Parts equivalent to those in FIG. 1 are indicated using the same reference numerals. I1
Omitted. In FIG. 2, 7 is a constant current source device, 8 is a group of light emitting diodes connected in series, and 9 is an N-ary Johnson counter circuit. In this Johnson counter circuit 9, one of the output terminals Q1 to QN becomes a trubel according to the number of count pulses applied to the clock terminal C.

Next, the operation shown in FIG. 2 will be explained. Input terminal 6
When one pulse input is applied to clock terminal C from
The output terminal Q of the Johnson counter circuit 9 becomes a trubel, and the transistor group 5Q,) transistor i'lLl
is turned on, so the light emitting diode I)1 of the light emitting diode group 8 lights up. Subsequently, when a second pulse is applied from the input terminal 6 to the clock terminal C, the output terminal Q2 of the Johnson counter circuit 9 becomes a trubel, and each of the light emitting diodes D1 and D2 lights up. Similarly, when the Nth pulse is applied from the input terminal 6 to the clock terminal C, each of the light emitting diodes D1 to DN lights up. At this time, the current flowing through each light-emitting diode D1-1)N is defined by a constant current (current shown in Figure 2 supplied from the original Oboro 7), and is limited by the number of light-emitting diodes D1-1'. For example, if a current of approximately IQmA is passed through one light emitting diode, the current supplied from the constant current source device 7 is the number of times the light emitting diodes are lit. Approximately 10
mA, and the current consumption can be effectively suppressed by J■.

As described above, according to the lighting method of the light emitting diode according to the present invention, y number of light emitting diodes are connected in series, and each light emitting diode is connected to a constant current ill? By arranging the lighting by JArn and controlling the lighting operation by a Johnson counter circuit, it is possible to significantly reduce the amount of serum consumed when a number of light emitting diodes are turned on by IIFi. Tonashima! It is an excellent product that has 4 excellent benefits.

4 "<1 'l' jl 46i, jl) 1 of M plane
Figure 1 shows circuit 1 showing the conventional lighting method for light emitting diodes.
Figure 1TIV, No. 21, 1 is a circuit diagram 2W4 showing a lighting method for a light emitting diode according to an embodiment of the present invention.

1...Voltage supply point, 2,8...Light emitting diode group, 3...Resistor P14...Shift register circuit, 5...Transistor? jJ, 6
......Input terminal, 7... Constant current source device, 9... Johnson counter circuit.

In addition, in the figures, the same reference numerals indicate the same or equivalent parts.
.

Claims (1)

[Claims] at least two or more light emitting diodes connected in series; a constant current source for lighting each light emitting diode;
A light-emitting diode, characterized in that the light-emitting diodes are sequentially lighted in accordance with the number of input pulses, using a Johnson counter circuit of binary or higher numbers for controlling the lighting operation of each of the light-emitting diodes. lighting method.