JPH07329853A - Battery charge control circuit - Google Patents

Abstract

PURPOSE:To control the voltage to be applied to a head lamp, and to control the charge of a battery. CONSTITUTION:In a battery charge control circuit for controlling the charge of a battery mounted on a motorcycle, voltage of a head lamp 22 is detected so as to control the voltage of the head lamp 22 within the predetermined voltage value, and voltage of a battery 24 is detected, and in the case where the voltage is less than the predetermined charging voltage, the battery 24 is charged. On the other hand, the voltage generated by a generator 21 is lowered by the predetermined quantity, and applied to the head lamp 22 without interposing an intermediate tap. As a voltage lowering means, a bridge circuit formed of diodes D21-24 is used, and the voltage drop by the intermediate tap of a coil of the generator is compensated by the voltage lowering work of these diodes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charge control circuit for a battery used in a motorcycle or the like.

[0002]

2. Description of the Related Art FIG. 5 shows an example of a charge control circuit for a battery used in a motorcycle or the like. In this figure, 1
Is a generator, 2 is an AC type headlamp, 3 is a charging control circuit (also referred to as “regulator”), 4 is a battery,
Reference numeral 5 indicates a DC load. Here, an AC voltage is applied to the headlamp 2 via the intermediate tap 1 a of the generator 1. The charge control circuit 3 includes a headlamp voltage detection circuit 6,
Battery voltage detection circuit 7 and thyristors S1 and S2
It is composed of When the headlamp voltage detection circuit 6 detects that the voltage applied to the headlamp 2 exceeds a predetermined voltage, it turns on the thyristor S1, and thus,
The negative half-wave of the AC voltage generated by the generator 1 is short-circuited. On the other hand, the battery voltage detection circuit 7 turns on the thyristor S2 when the battery voltage does not reach the predetermined voltage.
Then, the positive half-wave of the AC voltage is applied to the battery 4 to charge the battery 4.

The circuit shown in FIG. 5 is also called an AC / DC system, and is used in a small displacement motorcycle or the like.

On the other hand, a circuit as shown in FIG. 6 is used for a large displacement motorcycle or the like. This circuit is also called a full charge system, and includes a generator 11, a charge control circuit 12, a battery 13, a DC system headlamp 14, and a load 15.
It is composed of The charge control circuit 12 also includes a voltage detection circuit 16, diodes D1 to D4, and a thyristor S1.
1 and S12. Here, the voltage detection circuit 16
When the voltage of the battery 13 exceeds a predetermined voltage, the thyristors S11 and S12 are simultaneously turned on to short-circuit the positive and negative side waves of the generated AC voltage. This prevents the battery 13 from being overcharged.

[0005]

However, in the structure shown in FIG. 5, the generator 1 requires the intermediate tap 1a, which results in a relatively high cost and is difficult to downsize the entire circuit. There is. To improve this, the headlamp 2 can be connected to the overtap side, but if this is done, the voltage applied to the headlamp 2 will become high, and therefore the degree of short circuit by the thyristor S1 will increase. As a result, the voltage generated on the positive side drops due to the so-called armature reaction, and in that case, even if the thyristor S2 is turned on, a sufficient charging current cannot be supplied to the battery 4.

On the other hand, in the case shown in FIG. 6, if the output of the generator 11 is sufficient for the load of the headlamp 14 or the like, no particular problem occurs. However, if the output is small, the amount of discharge of the battery 13 will increase when the engine is running at low speed, and the battery 13 will be in an over-discharged state. This causes a problem that the battery 13 falls into a state of insufficient charge and the battery life is shortened.

The present invention has been made in view of the above circumstances, and a battery that does not require an intermediate tap in a generator coil and can effectively perform battery charge control with a relatively simple structure. An object is to provide a charge control circuit.

[0008]

In order to solve the above-mentioned problems, a battery charge control circuit according to claim 1 lights a headlamp with electric power generated according to the rotation of an engine in a motorcycle. A battery charge control circuit for controlling charging of a battery, comprising headlamp voltage control means for detecting a voltage of a headlamp and controlling the voltage of the headlamp within a predetermined voltage value. A charging control means for detecting the voltage and charging the battery when the voltage is less than a predetermined charging voltage, and a rectifying means for full-wave rectifying the generated voltage and applying it to the headlamp. It is characterized by doing.

According to a second aspect of the present invention, in the battery charge control circuit according to the first aspect, the voltage drop means is constituted by a diode bridge circuit.

According to a third aspect of the present invention, in the battery charge control circuit according to the first aspect, the voltage drop means is composed of a resistor for voltage drop of the generated voltage.

[0011]

In the circuit according to the first aspect, the voltage applied to the headlamp is controlled within a predetermined value, and the battery is charged when it is detected that the charging voltage of the battery is insufficient. In this case, since the generated voltage is stepped down by a predetermined amount and directly supplied to the headlamp, the intermediate tap of the generator coil which has been conventionally required is not necessary.

Further, by using a diode bridge circuit for full-wave rectification as described in claim 2, the voltage drop due to the intermediate tap can be replaced with the voltage drop due to the diode. As described in claim 3, a resistor for voltage drop may be used in place of the diode bridge circuit.

[0013]

FIG. 1 shows a battery charge control circuit and its peripheral circuits according to a first embodiment of the present invention. In this figure, 21 is an AC generator, 22 is an AC headlamp, 23 is a charge control circuit, 24 is a battery, and 25 is D.
C load is shown. The charge control circuit 23 also includes a headlamp voltage detection circuit 26, a battery voltage detection circuit 27, diodes D21 to D24, and thyristors S21 and S2.
It consists of 2.

The circuit shown in FIG. 1 is an improved version of the AC / DC system circuit shown in FIG.
1 doesn't need an intermediate tap. In FIG. 1, the headlamp 22 is connected between the connection point of the diodes D21 and D22 and the connection point of the diodes D23 and D24. The headlamp voltage detection circuit 26 directly detects the voltage across the headlamp 22 and turns on the thyristor S21 when the detected voltage exceeds a predetermined voltage. Further, the battery voltage detection circuit 27 turns on the thyristor S22 when the voltage of the battery 24 does not reach the predetermined voltage.
As a result, the battery 24 is charged.

With the above diodes D21 to D24,
The output of the generator 21 is full-wave rectified and applied to the headlamp 22, so that the headlamp 22 is turned on. In this case, due to the voltage drop effect of these rectifier diodes,
A voltage corresponding to the intermediate tap in FIG. 5 is applied to the headlamp 22. Therefore, the same effect as the conventional circuit can be obtained without providing the intermediate tap. Further, since the intermediate tap is not provided, the size can be reduced and the manufacturing cost can be suppressed.

FIG. 2 shows the essential parts of a second embodiment of the present invention. In this embodiment, one end of the headlamp 22 is grounded, and a parallel circuit including a plurality of diodes is inserted and connected between the other end and the output end of the generator 21. The other end of the headlamp 22 is connected to the headlamp voltage detection circuit 2
6 is connected. It can be said that the second embodiment has an advantage in wiring as compared with the first embodiment. This is because the headlamp 22 used in the first embodiment normally has a high beam terminal “H” and a low beam terminal “L” as shown in FIG. 3, and is separately provided with a ground. There is. However, in the second embodiment, one end of the headlamp 22 is already grounded, so that there is an advantage in wiring as compared with the first embodiment. Further, in the case of the second embodiment, there is also an advantage that one side of the headlamp 22 can be stabilized at the ground potential, and therefore the headlamp can be operated stably.
The number of diodes provided is determined according to the required voltage drop.

FIG. 4 shows an essential part of the third embodiment. In this embodiment, the diode group in the second embodiment is replaced by a resistor R.
Is replaced with. The third embodiment is suitable for the case where a headlamp having a fixed wattage is used. In other words, it is a preferred embodiment used when the amount of voltage drop due to the resistance R does not change.

[0018]

As described above, according to the present invention, in the charging control circuit of the battery for controlling the charging of the battery while lighting the headlamp by the electric power generated according to the rotation of the engine in the motorcycle, the voltage of the headlamp. Is detected, the voltage of the headlamp is controlled within a predetermined voltage value, and the voltage of the battery is detected.If the voltage does not reach the predetermined charging voltage, the battery is Since the headlamps are charged and the generated voltage is stepped down by a predetermined amount, the intermediate tap of the generator coil is not required, and therefore the device can be downsized and the manufacturing cost can be reduced. In addition, no unnecessary current flows from the battery to the headlamps even when the engine is running at low speed, which prevents over-discharge of the battery. The effect say. If a diode bridge circuit is used as the voltage drop means, it is possible to supply power even to a load that requires direct current.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a battery charge control circuit and its peripheral circuits according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing a main part of a second embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of a normal headlamp.

FIG. 4 is a circuit diagram showing a main part of a third embodiment of the present invention.

FIG. 5 is a circuit diagram showing an example of a circuit for headlamp control / battery charging control that has been conventionally used.

FIG. 6 is a circuit diagram showing another example of a circuit for headlamp control / battery charging control that has been conventionally used.

[Explanation of Codes] 1, 11 Generator 1a Intermediate tap 2, 14 Headlamp 3, 12 Charging control circuit 4, 13 Battery 5, 15 Load 6 Headlamp voltage detection circuit 7 Battery voltage detection circuit 16 Voltage detection circuit S1, S2 , S11, S12 Thyristor D1 to D4 Diode 21 Generator 22 Headlamp 23 Charging control circuit 24 Battery 25 DC load 26 Headlamp voltage detection circuit 27 Battery voltage detection circuit S21, S22 Thyristor D21 to D24 Diode R Voltage drop resistor

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display area // B60Q 1/04

Claims (3)

[Claims] 1. A charging control circuit for a battery, which controls the charging of a battery while lighting the headlamp with electric power generated according to the rotation of an engine in a motorcycle, detects the voltage of the headlamp, and Headlamp voltage control means for controlling the voltage of the headlamp within a predetermined voltage value, and charging for detecting the battery voltage and charging the battery when the voltage is less than the predetermined charging voltage A battery charge control circuit comprising: a control unit; and a voltage reduction unit for reducing a generated voltage by a predetermined amount and applying it to the headlamp. 2. The charge control circuit for a battery according to claim 1, wherein the voltage drop means is constituted by a diode bridge circuit. 3. The voltage drop means is composed of a resistor for voltage drop of a generated voltage.
The battery charge control circuit described.