JPS61189124A - Power source unit - 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] (Industrial Application Field) The present invention is a power source that allows a bicycle taillight to emit light continuously even when the bicycle is stopped! This is related to the Ii placement.

(Prior art) Figure 3 shows an outline of this type of conventional power supply device.
In the figure, 1 is a generator, 2 is a headlamp, 3 is a diode, 4 is a large capacitor, and 5 is a tail light. In such a device, when the bicycle is running, the generator 1 generates power by receiving power from the wheels, etc., and the headlight 2 is turned on by the electric power. on the other hand,
A part of the electric power is charged to a large capacitor 4 through a diode 3, and lights up a taillight 5 made of an LED or the like. When the vehicle is stopped, the power from the power generator 111 runs out and the headlights 2 are turned off, but the taillights 5 continue to be lit by the charging power of the large-capacity capacitor 4. Furthermore, a system has been proposed in which the electromotive force of the generator 1 is detected and the taillight 5 is turned on only when the vehicle is stopped.

(Problems to be Solved by the Invention) According to the device, the power source when stopped is a large capacity capacitor 4.
only, and since it is continuously discharged by the taillight 5,
For example, to keep the light on for about 10 minutes, the voltage resistance is 10V (volts).
, requires a capacitance of 200,000 μF (Farad), is extremely large and difficult to manufacture, and has low brightness.
Even if the ED is emitted continuously, it is difficult to attract attention and has a poor safety effect.

(Means for Solving the Problems) In order to solve the above problems, the present invention includes: a main power source that supplies power only when external power is received; a main load that operates using the power of the main power source; an auxiliary power source including a capacitor that is charged by a portion of the power of the main power source; an oscillation circuit that operates by the power of the auxiliary power source and intermittently generates a pulse signal; and a switch that is controlled on and off by the pulse signal. and an auxiliary load connected to the auxiliary power source via the switch means constitute a power supply device.

(Function) According to the above configuration, since power is supplied intermittently to the auxiliary load, it is possible to turn on the light for the same amount of time with a smaller capacitor than when power is supplied continuously. When taillights are used, they flash, making them more visible and improving safety.

(Embodiment) Fig. 1 shows an embodiment of the power supply device of the present invention, in which 10 is the main power supply, 20 is the main load, 30 is the auxiliary power supply, and 4
0 is an oscillation circuit, 50 is a switch means, and 60 is an auxiliary load.

1 electric wA10 is, for example, a well-known alternating current generator, and when operating, for example, when riding a bicycle, it obtains power from the wheels and generates 6
Generates AC power of V (rms). The main load 20 is
For example, it is a bicycle headlight, which is connected in series to the power generation v110 and is lit by the electric power.

Auxiliary electricity? l! 30 is a diode (for example, IN102
) 31 and a capacitor 32, which are connected in series to the generator 10. The capacitor 32 is instantaneously charged by a portion of the power generated by the generator 10 rectified by the diode 31.

The oscillation circuit 40 includes resistors 41, 42, 43° 44, and P
U T (Programmable U n1ju
(trans+5tor) 45 and a capacitor 46. Resistor 41 and capacitor 4
6 are connected in series and connected to both ends of the capacitor 32. Further, resistors 42 and 43 are also connected in series,
It is connected to both ends of the capacitor 32. PUT4
The anode of 5 is connected between the resistor 41 and the capacitor 46, the gate is connected between the resistors 42 and 43, and the cathode is connected to the switch means 50 via the resistor 44.

The PUT (for example, NT101) 45 is an element that can generate relatively stable pulse oscillations against changes in power supply voltage, and oscillates stably at a power supply voltage of 10 to 1.5V. In this circuit, when the terminal voltage of the capacitor 46 charged through the resistor 41, that is, the anode voltage of the PUT 45, has a constant relationship with the voltage of the resistor 43, that is, the gate voltage, the PUT 45 becomes conductive, and the capacitor 46 becomes conductive. The charging voltage is discharged through the resistor 44, and the PUT
45 becomes non-conductive, charging of capacitor 46 begins,
This is repeated to generate oscillation. By appropriately selecting the resistance value of each resistor and the capacitance value of the capacitor, the discharging time can be set to be sufficiently shorter than the charging time, and intermittent pulse signals can be generated.

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

The auxiliary load 60 is, for example, a tail light consisting of two LEDs.

According to the above configuration, when the bicycle or the like is running, the headlight 20 is turned on by the power supplied from the generator 10, the capacitor 32 is also charged instantly, and the oscillation circuit 40 is operated.
The transistor 50 is turned on and off by the output pulse of the PUT 45, and power is intermittently supplied to the taillight 60, causing it to blink. When the bicycle or the like stops and the power supply from the generator 10 stops, the headlight 20 turns off, but the capacitor 3
The oscillation circuit 40, the switch means 50, and the tail light 60 are operated by the electric power charged in the battery 2, and the tail light 60 continues to blink.

Here, in the oscillation circuit 40, resistors 41°, 42.43.
44 resistance value to 270, 33k.

100, 560 (Ω), and connect capacitor 46 to 10V.
Assuming that the withstand voltage is 2.2 μF, positive pulses with a width of 10 to 15771 seconds are generated at approximately 1 second intervals at the cathode of the PUT 45 (7). At this time, the average current flowing through the taillight 60 is 0.
．． 3mA (ampere) (=20mAXI 5/100
0), so that the capacitor 32 can exhibit long-life characteristics even at the acceptable level, and in order to flash the taillight 60 for about 10 minutes, for example, a 10V withstand voltage, 2200 μF electrolytic capacitor connected in 7 subarrays is required. (Total, 15400μ
F), it can be constructed with a capacitor of about 1/13 of the capacity of the conventional example, and the tail light 6
Since 0 flashes, it becomes more noticeable and improves safety.

FIG. 2 shows the terminal voltage characteristics of the capacitor 32 when the generator 10 is stopped, and in the figure, t', t2.・
. . . indicates the timing of starting discharge.

As mentioned above, 98577 for a discharge of about 15m5ec
Since the discharge is suspended for 1 sec, the terminal voltage gradually decreases as a whole, but even if there is no power supplied from the power generation side, it recovers slightly by the next discharge, and the terminal voltage reaches an average value of 1 sec. Even if the voltage is about .2V, two LEDs connected in series can be lit.

Note that in terms of the circuit configuration, since the capacitor 46 needs to be rapidly discharged, better characteristics can be obtained by using a tantalum capacitor or the like with a small inductance component. Also, since the impedance of the circuit is generally very high, care must be taken to ensure that the printed circuit board does not become caged due to temperature.

(Effects of the Invention) As explained above, according to the present invention, there is provided a main power supply that supplies power only when external power is received, a main load that operates using the power of the main power supply, and a main power supply that supplies power only when external power is received. an auxiliary power supply including a capacitor charged by a portion of the auxiliary power supply; an oscillation circuit that operates with the power of the auxiliary power supply and intermittently generates a pulse signal; a switching means controlled on and off by the pulse signal; and an auxiliary load connected to the auxiliary power supply through means, the auxiliary load is supplied with power intermittently, and can be lit for the same amount of time with a smaller capacitor than when power is supplied continuously. Furthermore, if a bicycle taillight is used as an auxiliary load, it will blink, making it more visible to the public, which has the advantage of improving safety.

[Brief Description of the Drawings] The drawings are provided to explain the present invention, and Fig. 1 is a circuit diagram showing an embodiment of the power supply device of the present invention, and Fig. 2 shows terminal voltage characteristics when a capacitor is discharged. The graph in FIG. 3 is a circuit diagram of a conventional power supply device. DESCRIPTION OF SYMBOLS 10... Generator, 20... Headlight, 30... Auxiliary power supply, 32... Capacitor, 40... Oscillation circuit, 5
0...Switch means, 60...Tail light.

Claims (1)

[Claims] A main power source that supplies power only when receiving power from an external source, a main load that operates with the power of the main power source, an auxiliary power source that includes a capacitor that is charged with a portion of the power of the main power source, and the auxiliary power source. An oscillation circuit that operates using power from a power supply and generates pulse signals intermittently, and an oscillation circuit that is turned on and off by the pulse signals.
A power supply device comprising a switch means to be turned off and an auxiliary load connected to the auxiliary power source via the switch means.