JPH0472456B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a power supply device for a bicycle that can continuously emit light from a tail light of a bicycle even when the bicycle is stopped.

(Prior Art) Figure 3 shows this type of conventional bicycle power supply device, in which 1 is a generator, 2 is a headlight, 3 is a diode, 4 is a capacitor, 5 is an LED, etc. It's a taillight.

According to this power supply device, when the bicycle is running, the generator 1 generates electricity by receiving power from the wheels, etc., and the headlight 2
uses that power to emit light continuously. Further, part of the electric power from the generator 1 is charged into the capacitor 4 through the diode 3, and the taillight 5 simultaneously emits light continuously.

On the other hand, when the bicycle is stopped, power is not supplied from the generator 1 and the headlight 2 stops emitting light, but the taillight 5 continues to emit light continuously due to the power stored in the capacitor 4.

In addition to the above-mentioned vehicle, there is also a vehicle that detects the presence or absence of an electromotive force from the generator 1 and causes the taillight 5 to emit light continuously only when the vehicle is stopped.

(Problem to be Solved by the Invention) However, in the conventional bicycle power supply device described above, the power source for the taillight 5 when stopped is the capacitor 4.
Moreover, since the stored power is continuously discharged by the taillight 5, for example, if the taillight 5 is to be turned on for 10 minutes, a capacitance of 200,000 μF with a withstand voltage of 10V is required, making the capacitor 4 large. There is a drawback. In addition, even if a low-brightness LED or the like is continuously emitted as the taillight 5, it is difficult to attract attention and has a drawback in that it is not effective in terms of safety at night or the like.

The present invention was made in view of the above circumstances, and its purpose is to provide a bicycle power supply device that can emit taillights for the same amount of time as conventional devices using a small-capacity capacitor, and that also provides excellent safety effects. It is about providing.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a generator that receives power from wheels or the like to generate and supply electric power, a headlamp that emits light using the electric power of the generator, and a generator that generates electric power. In a bicycle power supply device that is equipped with a capacitor that charges a portion of the machine's power and a taillight that can emit light using the power stored in the capacitor, an oscillation circuit that operates using the power of the capacitor and intermittently generates a pulse signal. , a switch means which is controlled on and off by a pulse signal from an oscillation circuit, and the capacitor and the tail light are connected through the switch means.

(Function) In the bicycle power supply device according to the present invention, when the bicycle is running, the headlight continuously emits light by the electric power supplied from the generator, and a part of the supplied electric power is charged in the capacitor of the auxiliary power source.

At the same time, the oscillation circuit is activated, and the switching means is controlled on and off by intermittent pulse signals outputted from the circuit, and power is intermittently supplied to the taillight to emit light intermittently.

On the other hand, when the bicycle is stopped, the power supply from the generator disappears and the headlights stop emitting light, but the oscillation circuit continues to operate due to the power stored in the capacitor of the auxiliary power supply, turning the transistor on and off. The taillight continues to emit light intermittently due to off control.

(Example) Fig. 1 shows a bicycle power supply device to which the present invention is applied, in which 10 is a main power supply, 20 is a main load, 30 is an auxiliary power supply, 40 is an oscillation circuit, 50 is a switch means, 60 is an auxiliary load.

The main power source 10 is a well-known alternating current generator (hereinafter referred to as generator 1
When the bicycle is running, it receives power from the wheels, etc. and generates electricity, generating AC power of about 6V (rms) during operation.

The main load 20 is a bicycle headlight (hereinafter referred to as headlight 20
) and is connected in series to the generator 10.

Auxiliary power supply 30 is a diode (for example IN1002)
31 and a capacitor 32, which are connected in series to the generator 10. A capacitor 32 in this auxiliary power source charges a portion of the power of the generator 10 rectified by the diode 31.

The oscillation circuit 40 includes four resistors 41, 42, 4
3, 44 and PUT (Programmable Unijunction
It consists of a transistor (eg NT101) 45 and a capacitor 46. Resistor 41 and capacitor 46
are connected in series and connected to both ends of the capacitor 32. Further, resistors 42 and 43 are also connected in series and connected to both ends of the capacitor 32. The anode of PUT45 is resistor 41
and the capacitor 46, the gate is connected to the resistor 42.
and 43, respectively, and the cathode is connected to switch means 50 via a resistor 44. This PUT 45 is an element that can generate relatively stable pulse oscillations against changes in power supply voltage, and oscillates stably between 10 and 1.5V of power supply voltage.

In this oscillation circuit 40, when the terminal voltage (anode voltage) of the capacitor 46 charged through the resistor 41 has a constant relationship with the voltage (gate voltage) of the resistor 43, the PUT 45 becomes conductive. The charging voltage of the capacitor 46 is discharged through the resistor 44, the PUT 45 becomes non-conductive again, and charging of the capacitor 46 starts, and oscillation is performed by repeating this process. The above discharge time is based on the resistance value of each resistor 41, 42, 43, 44 and the capacitor 4.
By appropriately selecting the capacitance of 6, it is possible to set it sufficiently short compared to the charging time, and it is possible to output intermittent pulse signals from the cathode.

The switch means 50 is an NPN transistor (for example, C1959, hereinafter referred to as transistor 50), whose base is connected to the resistor 44, whose collector is connected to one end of the capacitor 32 via an auxiliary load 60, and whose emitter is connected to the other end of the capacitor 32. connected to each end.

The auxiliary load 60 is a bicycle tail light (hereinafter referred to as the tail light 60) consisting of two LEDs, and is connected in series to one end of the capacitor 32 and the collector of the transistor 50.

According to the above-mentioned power supply device, when the bicycle is running, the headlight 20 continuously emits light due to the power supplied from the generator 10, and a part of the supplied power is supplied to the diode 3.
1, the capacitor 32 is charged.

At the same time, the oscillation circuit 40 operates and PUT4
The transistor 50 is turned on and off by an intermittent pulse signal outputted from the taillight 60, and power is intermittently supplied to the taillight 60 to emit light intermittently.

On the other hand, when the bicycle is stopped, power is not supplied from the generator 10 and the headlight 20 stops emitting light, but the oscillation circuit 40 continues to operate due to the power stored in the capacitor 32, and the transistor 50
The tail light 60 continues to emit light intermittently through on/off control.

More specifically, each resistor 4 of the oscillation circuit 40
The resistance value of 1, 42, 43, 44 is 270kΩ, 33k
Ω, 100kΩ, 560Ω, capacitor 46 is 10V
If the withstand voltage is 2.2μF, the cathode of PUT45 has
Positive pulses with a width of 10 to 15 msec are generated at approximately 1 second intervals. At this time, the average current flowing through the taillight 60 is 0.3
mA (=20 mA x 15/1000), and even if the capacitor 32 has a small capacity, it can exhibit long life characteristics.

To make the taillight 60 emit light intermittently for about 10 minutes, for example, you can use seven 2200μF electrolytic capacitors connected in parallel (total 15400μF) with a withstand voltage of 10V, which is about 1/13 the capacitance of the conventional example. It can be configured by Further, since the tail light 60 emits light intermittently, it is more easily noticed by people than when it emits light continuously, and safety at night and the like is significantly improved.

Figure 2 shows the capacitor 32 when the bicycle is stopped.
This shows the terminal voltage characteristics of t1 and t2 in the figure.
... indicates the timing of starting discharge. As mentioned earlier, the discharge is paused for 985 msec compared to the approximately 15 msec discharge, so the terminal voltage gradually decreases as a whole, but even if there is no power supply from the generator 10 side, it will continue until the next discharge. The voltage recovers slightly, so even if the terminal voltage drops to about 1.2V, the two LEDs can still emit light.

Note that when considering the circuit configuration, it is better to use a tantalum capacitor or the like with a small inductance component as the capacitor of the oscillation circuit because of the necessity of rapid discharge. Also, since the impedance of the circuit is generally high, it is better to avoid thermal linkage on the printed circuit board.

(Effects of the Invention) As detailed above, according to the present invention, when the bicycle is stopped, the oscillation circuit is operated by the electric power stored in the capacitor of the auxiliary power supply, and the intermittent pulses are output from the oscillation circuit. Since the switching means can be controlled on and off by the signal, and power can be supplied to the taillights intermittently, the capacitance of the capacitor can be smaller compared to the case where power is continuously supplied to the taillights from the capacitor of the auxiliary power supply. The advantage is that even with a small capacitor, the taillights can emit light for the same amount of time as before.

Furthermore, since the taillight can be emitted intermittently when the bicycle is stopped, it is easier to attract attention than when the taillight is emitted continuously, and an excellent safety effect can be obtained at night.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a bicycle power supply device to which the present invention is applied, FIG. 2 is a terminal voltage characteristic diagram during capacitor discharge, and FIG. 3 is a circuit diagram of a conventional bicycle power supply device. In the diagram, 10... Generator, 20... Headlight, 30
... Auxiliary power supply, 32 ... Capacitor, 40 ... Oscillation circuit, 50 ... Switch means, 60 ... Tail light.

Claims (1)

[Scope of Claims] 1. A generator that receives power from a wheel or the like to generate and supply electric power, and a headlamp that emits light using the electric power of the generator;
A bicycle power supply device that is equipped with an auxiliary power source that includes a capacitor that charges a portion of the power from the generator, and a taillight that can emit light using the power stored in the auxiliary power source. A power supply for a bicycle, comprising: an oscillation circuit that generates a signal; and a switch means that is controlled on and off by a pulse signal of the oscillation circuit, and the auxiliary power supply and a taillight are connected via the switch means. Device.