JPS63305722A - Car voltage regulator - Google Patents

Abstract

PURPOSE:To prevent the lowering of efficiency by introducing one half-wave of an AC output from a flywheel magneto to a battery through a first voltage reg ulator and supplying another load with the other half-wave through a second voltage regulator. CONSTITUTION:Positive half-waves in an AC output from a magneto coil 12A for a flywheel magneto 10A are fed to a battery 16A through an SCR 14A, and negative half-waves are supplied to lamps 22A, 22B as other load through an SCR 26A and a lamp switch 20A. Voltage applied to the battery 16A and the lamps 22A, 22B is detected respectively at a point (c) and a point (d), and input to gate circuits 18A, 24A. The phase of the magneto coil 10A is detected from one output terminal (e) point of the magneto coil 10A, and input to the gate circuits 18A, 24A.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention provides a method for half-wave rectifying the AC output of a flywheel magneto (magnetic alternator) and supplying it to loads such as batteries and other lamps. This invention relates to a voltage regulator for a vehicle.

(Background of the Invention) Flywheel magnetos are widely used in small vehicles such as motorcycles. When using this magneto, the circuit configuration shown in FIG. 2 has conventionally been widely adopted.

In this figure, the symbol lO is a flywheel magnet, 1
Reference numeral 2 designates the power generating coil, and 14 and 16 designate an SCR and a battery that form a closed circuit with the power generating coil 12. This 5C
R14 supplies a positive half-wave of the AC output of the generator coil 12 to the battery 16.

5CR14 is phase controlled by the gate circuit 18, and a
The charging voltage detected from the point is kept constant.

The generating coil 12 is provided with an intermediate tap, and a lamp switch 20 and a lamp 2 are connected between this intermediate tap and ground.
2 are connected in series. This intermediate tap voltage is detected from point b and input to the gate circuit 24. 26 is an SCR that is connected in parallel to the generating coil 12 and short-circuits the negative half wave.
The phase of this 5CR 26 is controlled by the gate circuit 24 so as to keep the voltage at point b constant.

In controlling the voltage of the lamp 22 in this way, 5C
The method of short-circuiting the generator coil 12 using R26 (referred to as the short-circuit phase control method) has a problem in that the charging voltage of the battery 16 fluctuates significantly due to changes in the load of the lamp 22. FIG. 3 is a circuit diagram for explaining the reason, and FIG. 4 is a current waveform diagram. In Fig. 3, the AC output of magnet) 10a passes through an ammeter 28, and its positive and negative half waves are connected to two parallel-connected loads Zl and Z2, respectively, through diodes D.
I, D2. If the loads 21 and 22 are equal, the positive and negative currents flowing through the respective loads Z1 and z2 will be equal as shown in FIG. 4A. But the load zl
, z2 become unbalanced, for example, when Zl > 22, a large current flows through the small load Z2, and as a result, as shown in FIG. 4B, the period of the voltage applied to the load Z1 becomes shorter. For this reason, for example, if Zl is a battery and Z2 is short-circuited, it becomes equivalent to 22 = 0, and the period of the voltage applied to the battery of Zl becomes extremely short, causing the problem that the charging current of the battery decreases and the efficiency decreases. Ta. Also at this time, diode D+ (corresponds to 5CR26 in Figure 2)
A negative half-wave short-circuit current flows through the generator coil 12a (corresponding to the coil 12 in FIG. 2), which not only increases heat generation but also damages the generator coil 12a (12) and diode D+.
It was necessary to increase the capacity of (SCR26) or use one with a higher rating.

(Purpose of the Invention) The present invention was made in view of the above circumstances, and when supplying magneto output to a battery and other loads such as lamps, the battery can It is an object of the present invention to provide a voltage regulator for a vehicle that can prevent efficiency from decreasing due to a large decrease in charging current and can set the ratings of a power generating coil, SCR, etc. to a low value.

(Structure of the Invention) According to the present invention, it is an object of the present invention to obtain a charging current for a battery and a load current for other loads from a flywheel magneto, in which one half wave of the AC output of the magneto is This is achieved by a voltage regulator for a vehicle, characterized in that one half wave is introduced to the battery via a second voltage regulator, while the other half wave is supplied to the other load via a second voltage regulator.

(Embodiment) Fig. 1 is a circuit diagram of an embodiment of the present invention, in which the positive half-wave of the AC output of the generating coil 12A of the flywheel magnet IOA is supplied to the battery 16A via the 5CR14A, and the negative half wave is 5CR26A, lamp switch 20A
is supplied to lamps 22A and 22B, which are other loads. The voltages applied to the battery 16A and the lamps 20A, 20B are detected from points C and d, respectively, and input to gate circuits 18A, 24A. Further, the phase of the power generating coil IOA is detected from one output terminal point e of this coil IOA and input to the gate circuits 18A and 24A. Therefore 5C
R14A and the gate circuit 18A form a first voltage regulator A that controls the phase of the charging voltage of the battery 16A.
Second voltage regulator B with CR26A and gate circuit 24A
is formed.

According to this circuit, when the lamp switch 20A is on, the battery 16A is charged during the positive half-wave, while current is supplied to the lamps 22A and 22B during the negative half-wave. Further, when the lamp switch 20A is off, no current flows through the lamps 22A and 22B, and only a positive half wave flows through the battery 16A. Therefore, at this time, no excessive current flows through the generator coil 12A or the 5CR 26A, and the charging voltage of the battery 16A does not decrease. Especially considering that the load on the lamps 22A and 22B has become infinite at this time, As is clear from the explanation in Figure 3.4, the reduction in the current of the lamps 22A and 22B increases the charging current of the other battery 16A, improving efficiency.

(Effects of the Invention) As described above, the present invention leads one of the positive and negative half-waves of the AC output of the magneto to the battery via the first voltage regulator, while the other half-wave is guided to the battery through the second voltage regulator. Since the short-circuit current does not flow to the magneto's generating coil when other loads are turned off, the cycle of the battery's charging voltage becomes shorter and the charging current decreases. Rather, the charging current increases and the efficiency can be increased. Furthermore, the generation coil and the second voltage regulator generate less heat, making it possible to lower their ratings.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention, FIG. 2 is a circuit diagram of a conventional device, FIG. 3 is a circuit diagram for explaining the same, and FIG. 4 is a current waveform diagram thereof. 10A...Magnet, 12A...Generating coil, 14A, 26A...5CR1 16A...Battery, 22A, 22B...Lamp as other load, A...
・First voltage regulator, B...second voltage regulator!

Claims (1)

[Claims] In a flywheel magneto that extracts a charging current for a battery and a load current for other loads, one half-wave of the AC output of the magneto is supplied to the battery via a first voltage regulator. A voltage regulator for a vehicle, characterized in that one half wave is guided to a battery, and the other half wave is supplied to the other load via a second voltage regulator.