JPS6365997B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an AC power flashing device used in a vehicle not equipped with a battery, and is used, for example, in a direction indicator flashing device for a small motorcycle driven by a magneto.

Conventionally, most common flashing devices operate on DC battery power. However, a flashing device is also required in a vehicle that does not have a battery and only has an AC power source. It is desirable that this flashing device has most of the same structure as the DC flashing device.

Furthermore, it is desirable that the rectifier be small and also have a voltage adjustment function since the output voltage of the magneto fluctuates.

In view of these requirements, the inventor initially performed full-wave rectification of the output of the magneto with a diode, clipped the rectified DC voltage with a Zener diode to create a constant pulsating voltage, and further smoothed this pulsating voltage with a smoothing capacitor. This smoothed DC voltage was applied to a DC flashing device.

However, in this device, the rectifier circuit is large and the Zener diode generates a large amount of heat, increasing the cost, and when it is incorporated into a DC flashing device, the entire flashing device becomes extremely large, making it virtually impossible to incorporate it. It was hot.

The present invention is equipped with an extremely small rectifier, so it can
The object of the present invention is to provide an alternating current power flashing device that operates normally even though a battery is not installed in the vehicle and is extremely compact overall.

To this end, the present invention has the structure of a rectifier circuit having a thyristor and a constant voltage diode that controls the gate input of the thyristor as a circuit that performs rectification and voltage adjustment, and a capacitor is provided on the output side of the rectifier circuit. The main purpose of this paper is to focus on and specify the time constant of a discharge circuit formed by a capacitor and a blinking relay coil in order to reduce the capacity of the circuit.

Examples will be described below.

In FIGS. 1 to 4 showing the first embodiment, reference numeral 1 denotes a magneto that serves as an AC power source, and is mounted on a small motorcycle that is not equipped with a battery. Reference numerals 2, 3, 4, and 5 are flashing lamps for direction indication.Left and right lamps 2 and 3 are provided at the front of the motorcycle, and left and right lamps 4 and 5 are provided at the rear.For example, when turning left, the front The left lamp 2 and the rear left lamp 4 flash alternately, and the front left lamp 2 lights up and goes out, then the rear left lamp 4 lights up and goes out, and then the front left lamp 4 lights up and goes out. Lamp 2 on the left lights up.

Reference numeral 6 denotes a relay contact for switching on and off the lamp current, which is composed of a switching contact. 7 is a relay coil that drives this relay contact with electromagnetic force. This relay coil 7 includes transistors 8, 9, 10 and a capacitor 1.
1, 12 and resistors 13, 14, 15, 16, 1
A semiconductor oscillation circuit 9 consisting of 7 and 18 cuts off and on its own excitation current.

Reference numeral 20 denotes a rectifier circuit, which is built into one case 21 (FIG. 4) of the flashing device and mounted on the same substrate 22 as the components of the semiconductor oscillation circuit 19.

The rectifier circuit 20 includes a thyristor 25, a contact holding capacitor 26 provided on the output side of the thyristor 25, and a regulator that controls the ignition input supplied to the gate of the thyristor 25 according to the output voltage value of the magneto 1. and a voltage diode 27.

The power stored in the contact holding capacitor 26 is consumed by the semiconductor oscillation circuit 19 and the relay coil 7, but the semiconductor oscillation circuit 19
The power consumption is extremely small and can be ignored.

Since the thyristor 25 is intermittently conductive, the voltage across the contact holding capacitor 26 also _pulsates , but the capacitor 26 The capacity is determined. Furthermore, if this capacitance is too large, the size of the capacitor 26 will become large, so the capacitance of the capacitor 26 must be at least a value that ensures the operation of the flashing device, and must be of a suitable size.

Next, the operation will be explained.

First, the condition for turning on the thyristor 25 is that the voltage between the gate and cathode of the thyristor 25 is equal to or higher than the gate trigger voltage (approximately 1V).

Here, the output terminal voltage of magneto 1 is V _O , the voltage between the gate and cathode of thyristor 25 is V _G ,
It is assumed that the forward voltage of the diode 30 is V _D , the voltage across the resistor 31 _{is VR} , the Zener voltage of the constant voltage diode 27 is V _Z , and the voltage across the capacitor 26 is V _C .

Further, the output terminal voltage V _O of the magneto 1 is V _O >0 when the anode side potential of the thyristor 25 is higher than the anode side potential of the Zener diode 27.
shall be. As the state of V _O , when V _O <0, V _O =
0, there are three possible states when V _O >0.

Hereinafter, the operation of the thyristor 25 will be explained for each state. It is assumed that the thyristor 25 is normally in the OFF state.

(1) When V _O <0, thyristor 25 does not turn on.

(2) When V _O = 0, thyristor 25 does not turn on.

(3) When V _O >0, the following two states are possible.

(3-1) When V _O ≦V _Z ... (1), V _O = V _D + V _G + V _C + V _R ... (2) Here, V _R ≒ 0 (because almost no current flows). , V _O = V _D + V _G + V _C ……(2)′ Furthermore, V _C = V _O −V _G −V _D ……(2)″ In this state, V _G ≧V _GT ……(3) (Note ) When V _GT is the gate trigger voltage (approximately 1V), the thyristor 25 is turned on.

From formula (2), this becomes V _C ≦V _O −V _GT −V _D ...(4) When the charging voltage of capacitor 26 is the voltage expressed by formula (4), thyristor 25 is
The ON state continues as long as V _O > V _C (5), and the capacitor 2
Charge 6. (However, the forward voltage drop of the thyristor 25 is ignored.) Also, when V _O =V _C (6), the thyristor 25 is turned off again.

Next, (3-2) When V _O > V _Z ... (7), the voltage regulator diode 27 breaks down, and V _O = V _R + V _Z ... (8) V _Z = V _D + V _G + V _C ……(9) ∴V _G =V _Z −(V _D +V _C ) ……(9)′ In this state, V _G ≧V _GT ……(10) (Note) V _GT is the gate trigger voltage (approx. 1V), the thyristor 25 turns on.

This state is expressed by equation (9)': V _G = V _Z − (V _D + V _C ) ≧ V _GT ……(11) From this, V _C ≦V _Z −V _D −V _GT (V) ……(12 ) Thyristor 2 only in the conditions of equations (7) and (12).
5 is turned on.

Also, from this, V _C > V _Z −V _D −V _GT (13), the thyristor 25 will not turn on. When the thyristor 25 is turned on, it remains on while the power supply voltage V _O is V _O > V _C (14), and the capacitor 26
to charge.

When V _O =V _C (15), the thyristor 25 is turned off. Here, the relay coil 7 and the semiconductor oscillation circuit 19 of the blinking device are devices that operate with DC power, and if the capacitor 26 has a charge, it operates using that charge.

And when these devices 7, 19 operate,
The charge in the capacitor 26 is discharged, and the load resistance R _L of these devices 7 and 19 and the capacitor 2
It is determined by the capacitance C _C of 6. Time constant T _CR
As a result, the value of the voltage V _C across the capacitor 26 becomes smaller. The load resistance R _L can be considered to be substantially equal to the resistance value of the relay coil 7 .

When the value of V _C becomes small and the state of equation (4) or (12) is reached, the thyristor 25 turns ON again,
When the capacitor 26 is charged and the state of equation (6) or (15) is reached, the thyristor 25 is turned off.

The device 7, 19 is a turn signal switch 4
As long as thyristor 25 is connected to either lamp, it is always in operation, and the electric charge stored in capacitor 26 is constantly discharged through devices 7 and 19, so when thyristor 25 is turned off, the voltage of capacitor 26 is V _C is decreasing again.

The voltage waveforms of the operation of the rectifier circuit 20 of the present invention as described above are shown in FIGS. 2 and 3.

In this waveform diagram, the peak voltage of the power supply voltage V _O is V _P
shall be.

(i) When V _P ≦ V _Z , from the conditions of equations (1) and (4), the second
As shown in the figure, the thyristor 25 is turned ON almost every time in response to the positive voltage of V _O , and the voltage of the capacitor 26 becomes a value closer to V _P.
This means that the rectifier circuit 20 functions as a rectifier circuit with the same efficiency as half-wave rectification.

(ii) When V _P > V _Z In this case, from the conditions of equations (1), (4) and (7), (12), the thyristor 25 will respond to the positive voltage of V _O as shown in Figure 3. Rather than turning on all of the waveforms, V _C
The function is to select the time to turn on so that the value is closer to V _Z. This is the rectifier circuit 20
This means that it functions as a constant voltage power supply with V _Z as the regulation voltage.

As is clear from these voltage waveform diagrams, the capacity of the contact holding capacitor 26 is large, and the relay coil 7
The larger the resistance value of the capacitor 26, the more gradually the voltage drop curve 40 (Fig. 2) when the capacitor 26 is discharged, and the lowest value of the voltage across the capacitor 26.
_VL becomes larger.

If this minimum voltage V _L is made larger than the contact open voltage (V _OP ) of the relay coil 7, the blinking operation will be performed normally.

Note that the contact opening voltage V _OP is the voltage at which the relay contact 6 opens from the right side when the voltage across the relay coil 7 decreases after the relay contact 6 turns on from the right side. In reality, the capacitance of the capacitor 26 is about 250 [μF].

FIG. 4 is an internal layout diagram of the AC power flashing device, in which 30 is a diode, 31 is a resistor, 27 is a constant voltage diode, 45 is a capacitor connected between the gate and cathode of the thyristor 25, and the output of the magneto 1. This bypasses high frequency noise contained in the thyristor 25 and eliminates malfunction of the thyristor 25.
26 is a contact holding capacitor, diameter 1 [cm]
A small one with a height of about 2 cm is fine. 6 and 7 are relays, which are the same as those used in DC flashers.

And the outer diameter dimensions are width W 30 [mm] height [H]
is 51.5 [mm], and compared to conventional DC-only flashing devices, the width W is the same and the height is only 10 [mm] longer, making it extremely compact.
This is because the capacitance of the contact holding capacitor 26 can be reduced according to the technical idea of the present invention.

Next, the operation of the entire flashing device shown in FIG. 1 will be explained.

In the first illustrated state, the relay coil 7 is not energized. Now turn signal switch 40, 41
If it is connected to the left side, the output voltage of magneto 1 is as follows: magneto 1 → lamp 4 → turn signal switch 40 → terminal 50 → thyristor 25
A current flows through → capacitor 26 → semiconductor oscillation circuit 19, and semiconductor oscillation circuit 19 energizes relay coil 7 at a period determined by the time constant of the capacitor and resistor provided inside. When the relay coil 7 is energized, the relay contact 6 is closed to the right side, and the direction indicator lamp 4 disposed on the left side of the rear of the vehicle lights up.

When the relay contact 6 is closed on the right side, the output voltage of the magneto 1 is continuously applied to the thyristor 25 via the relay contact 6.

Next, when the relay coil 7 is no longer energized again, the relay contact 6 returns to the state shown. Thereafter, this is repeated, and the left lamps 2 and 4 at the front and rear of the vehicle flash alternately.

Next, a second example will be described. In FIG. 5, in this embodiment, the position of the rectifier circuit 20 is
The only difference from the embodiment is that the output of the magneto 1 is directly applied to the rectifier circuit 20 without passing through relay contacts and lamps, and the output voltage of the magneto 1 is always applied to the rectifier circuit 20.

In addition, in the above embodiment, by incorporating the rectifier circuit into one blinker case, the size can be reduced and installation work to the vehicle can be simplified.

In addition, by determining the capacitor capacity so that the voltage across the contact holding capacitor has a time constant that is greater than the discharge time constant so that the voltage across the contact holding capacitor does not drop below the relay contact open voltage of the relay coil, it is possible to hold the contact without impairing the blinking operation. It becomes possible to minimize the size of the capacitor.

Furthermore, by guiding the output of the alternator to the rectifier circuit through the lamp filament, no voltage is applied to the rectifier circuit when the lamp is out or the turn signal switch installed in the front stage of the lamp is open. Since the voltage is applied only when the voltage is applied, the power consumption of the circuit due to leakage current can be eliminated.

As described above, in the present invention, in a vehicle not equipped with a battery, even if the voltage of the alternator frequently fluctuates depending on the rotation speed of the vehicle engine, the flasher can be operated normally, and the flasher can blink. The overall shape of the container can be made extremely small and inexpensive. In addition, vehicles that are not equipped with this type of battery are small and inexpensive, but since the flashing device is mounted on such a vehicle, it is necessary that the flashing device itself be small and inexpensive. The present invention, which satisfies these needs, is extremely excellent.

[Brief explanation of drawings]

FIG. 1 is an electric circuit diagram showing a first embodiment of the device of the present invention, FIGS. 2 and 3 are voltage waveform diagrams during operation of the circuit illustrated in FIG. 1, and FIG. 4 is a diagram showing the circuit illustrated in FIG. FIG. 5 is an electrical circuit diagram showing a second embodiment of the device of the present invention. DESCRIPTION OF SYMBOLS 1... AC generator, 2-5... Lamp, 6... Relay contact, 7... Relay coil, 9... Semiconductor oscillation circuit,
20... Rectifier circuit, 26... Contact holding capacitor,
25... Thyristor, 27... Constant voltage diode, 2
1... Flasher case.

Claims (1)

[Scope of Claims] 1. A blinking device for an AC power source, comprising an alternating current generator 1 that serves as an alternating current power source for a vehicle not equipped with a battery, and a blinking device that blinks lamps 2 to 5 by being supplied with power from the alternating current generator 1. The flashing device includes a relay coil 7 that drives a relay contact 6 that intermittents the lamp load current, a semiconductor oscillation circuit 19 that intermittently energizes the relay coil 7, and the power of the semiconductor oscillation circuit 19 and the relay. a rectifier circuit 2 that supplies energizing power to the coil 7 and rectifies the output of the alternator 1;
0, the rectifier circuit 20 rectifies the output of the alternator 1 and also includes a thyristor 25 that repeatedly turns on and off to charge a contact holding capacitor 26 of its own output stage; a constant voltage diode 27 that allows an ignition input to be supplied to the gate of the thyristor 25 when the output voltage of the thyristor 25 is below a set voltage; The contact holding capacitor has a capacitance large enough to have a time constant greater than or equal to a discharge time constant in which the voltage across the capacitor does not fall below the relay contact open voltage of the relay coil 7, mainly with respect to the resistance value of the relay coil 7. 26. A flashing device for an AC power supply, comprising: 2 Thyristor 25, constant voltage diode 27, and contact holding capacitor 26 forming the rectifier circuit 20
The AC power supply according to claim 1, wherein the semiconductor oscillation circuit 19, the relay coil 7, and the relay contact 6 are housed together in a blinker case 21. Flashing device. 3. The AC power flashing device according to claim 1 or 2, wherein the rectifier circuit 20 is supplied with power from the AC generator 1 via the lamps 2 to 5. .