JPH08168190A - Charge control circuit for battery - Google Patents

Abstract

PURPOSE: To increase the charging capacity of a battery by charging the battery through a full-wave rectifier means for the battery when the battery voltage 15 lower than a predetermined charging voltage and controlling the power supply from a generator to a head lamp such that the voltage of the head lamp comes within a predetermined range. CONSTITUTION: A battery voltage control circuit 29 detects the voltage of a battery 24 and when it is lower than a set level, thyristors S23, S24 are turned ON to charge the battery 24. A head lamp voltage control circuit 28 detects the voltage across a head lamp 22 directly and when the detected voltage exceeds a predetermined level, thyristors S21, S22 are turned OFF. Since the output from a generator 21 is full-wave rectified and applied to the battery 24, power generated from the generator 21 can be utilized efficiently and the charging capacity of the battery 24 can be increased without increasing the size of the generator 21.

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. 2 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 above-mentioned circuit shown in FIG. 2 is also called an AC / DC system and is used in a motorcycle having a small displacement.

[0004]

However, in the configuration shown in FIG. 2, the positive half-wave of the AC voltage output from the generator 1 is half-wave rectified by the thyristor S2 to charge the battery 4. Therefore, the electric power generated by the generator 1 cannot be efficiently used to charge the battery 4,
In order to increase the charging amount of the battery 4, it is necessary to use a large generator 1 and there is a drawback that the circuit becomes large and the cost becomes high.

Further, in the structure shown in FIG. 2, the generator 1 requires the intermediate tap 1a, which results in a relatively high cost and it is difficult to downsize the entire circuit. 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, the thyristor S2 is turned off.
Even with N, there is a drawback that a sufficient charging current cannot be supplied to the battery 4.

Further, in the structure shown in FIG. 2, the voltage applied to the headlamp 2 is controlled by turning on the thyristor S1.
Since N is performed by short-circuit control for short-circuiting the negative half-wave of the AC voltage generated by the generator 1, a current flows, the generator 1 generates heat, and the life of the generator 1 is shortened. there were.

The present invention has been made in view of the above circumstances. By efficiently utilizing the AC voltage output from the generator for charging the battery, the generator does not increase in size and cost. Provide a battery charge control circuit that can increase the charge amount of a battery, does not require an intermediate tap in the generator coil, and can suppress the heat generation of the generator to extend the life of the generator. The purpose is to

[0008]

In order to solve the above-mentioned problems, a battery charge control circuit according to a first aspect of the present invention controls a headlamp with electric power generated by a generator according to the rotation of an engine in a motorcycle. In a battery charge control circuit that lights and controls the charging of the battery, full-wave rectifying means for the battery that applies full-wave rectification of the output of the generator to the battery, and detects the voltage of the battery. When the voltage is less than the predetermined charging voltage, the charging control means for charging the battery from the full-wave rectifying means for the battery and the headlamp voltage are detected, and thus the voltage of the headlamp is set to the predetermined value. Headlamp voltage control means for controlling energization from the generator to the headlamp so that the voltage is within the voltage value.

In the present invention, since the headlamp is an AC type load, the output of the generator may be basically applied to the headlamp without being rectified. In this case, For example, as a headlamp voltage control means, a switching element is provided between the generator and the headlamp,
A device configured to control ON / OFF of energization to the headlamp by this switching element is used.

According to a second aspect of the present invention, in the battery charge control circuit according to the first aspect, there is provided a full-wave rectifying means for a headlamp, which full-wave rectifies the output of the generator and applies the full-wave rectification to the headlamp. The full-wave rectifying means for headlamps and the full-wave rectifying means for headlamps are each configured by a bridge circuit composed of two thyristors and two diodes, and the two diodes of each full-wave rectifying means are shared. It is characterized by

In the present invention, as the charge control means and the headlamp voltage control means, for example, the voltages of the battery and the headlamp are detected, and the full wave for the battery and the headlamp is detected based on the detected voltage. A device that controls ON / OFF of a thyristor that constitutes a part of the rectifying means is used, but the invention is not limited to this.
A switching element is provided between the battery and headlamp full-wave rectification means and the load battery and headlamp, and the switching element controls ON / OFF of energization of the battery and headlamp. Is also good.

When the output of the generator is rectified and applied to the headlamp, the full-wave rectifying means does not necessarily have to be used as the rectifying means for the headlamp, and a half-wave rectifying means may be used. good.

[0013]

In the circuit according to the first aspect of the present invention, since the full-wave rectifying means for the battery is configured to full-wave rectify the output of the generator and apply it to the battery, the electric power output from the generator Can be efficiently used to charge the battery. In addition, the headlamp voltage control means detects the voltage of the headlamp, so that the generator is energized so that the voltage of the headlamp is within a predetermined voltage value. Since it is configured to control, it is possible to apply a predetermined voltage to the headlamp without providing an intermediate tap on the generator coil, and, instead of a short-circuit control system,
Since the open control method of controlling the power supply to the headlamp by the headlamp voltage control means is adopted, the heat generation of the generator can be suppressed.

Further, as described in claim 2, a full-wave rectifying means for the headlamp for full-wave rectifying the output of the generator and applying it to the headlamp is provided, and the full-wave rectifying means for the battery and the headlamp. It is possible to reduce the number of parts of the full-wave rectifying means by sharing the two diodes of the above.

[0015]

1 shows a battery charge control circuit and its peripheral circuits according to an embodiment of the present invention. In this figure, 21 is an AC generator, 22 is a headlamp as an AC load, 23 is a charge control circuit, 24 is a battery, 2
5 is a DC load, 26 is a main switch, and 27 is a fuse. The charge control circuit 23 includes a headlamp voltage control circuit 28, a battery voltage control circuit 29, a headlamp full-wave rectifier circuit 30, and a battery full-wave rectifier circuit 31. The full-wave rectifier circuit 30 for headlamp includes a thyristor S21, S22, and a diode D.
The full-wave rectifier circuit 31 for the battery is composed of thyristors S23 and S2.
4 and a bridge circuit of diodes D21 and D22. The diodes D21 and D22 are shared by the full-wave rectifier circuit 30 for the headlamp and the full-wave rectifier circuit 31 for the battery.

Reference numeral 32 denotes a full-wave rectifying circuit for securing a power source when the battery terminal is disconnected, and includes diodes D23 and D2.
4 and the diodes D21 and D22. In this case, the diode D2
1, D22 are shared with the full-wave rectifier circuit 30 for headlamps and the like. Rectifier circuit 32 for securing this power supply
Performs the following operations. First, when the battery terminal is disconnected, the headlamp voltage control circuit 28 is moved from the battery 24.
And a control circuit 28 for the battery voltage control circuit 29,
The voltage for driving 29 is not applied, so that the thyristors S21 to S24 do not operate. Therefore,
Power is not supplied to the headlamp 22 and the battery 24 side. Therefore, in order to prevent this, the output of the generator 21 is rectified and the headlamp voltage control circuit 2 is rectified.
8 and a rectifier circuit 32 that drives the battery voltage control circuit 29. The rectifier circuit 32 may of course perform half-wave rectification.

In the circuit shown in FIG. 1, the battery 24 includes a diode D2 and a connection point of thyristors S23 and S24 which form a full-wave rectifying circuit 31 for the battery.
1 and the connection point of D22. The battery voltage control circuit 29 detects the voltage across the battery 24 and turns on the thyristors S23 and S24 when the voltage of the battery 24 does not reach the set voltage, thereby charging the battery 24. When the voltage of the battery 24 exceeds the set voltage, the thyristor S
23 and S24 are turned off to stop the supply of electric power to the battery 24.

Further, in FIG. 1, the headlamp 22
Is the connection point of the thyristors S21 and S22 and the diodes D21 and D that form the full-wave rectification circuit 30 for the headlamp.
22 is connected to the connection point. The headlamp voltage control circuit 28 directly detects the voltage across the headlamp 22 and turns off the thyristors S21 and S22 when the detected voltage exceeds a predetermined voltage.

With the above structure, in the battery charge control circuit according to this embodiment, the thyristor S2 is used.
The output of the generator 21 is full-wave rectified by S3, S24 and the diodes D21, D22 and applied to the battery 24, whereby the battery 24 is charged. in this case,
Since the output of the generator 21 is full-wave rectified and applied to the battery 24, the electric power generated by the generator 21 can be efficiently used, and the battery 24 can be used without increasing the size of the generator 21. The amount of charge can be increased. Therefore, the DC load 25 driven by the battery 24
Even when the capacity or type of the battery 24 is increased, the over-discharged state of the battery 24 can be prevented, and the battery 24 can be prevented from being in an insufficiently charged state and the life of the battery 24 can be shortened.

The output of the generator 21 is full-wave rectified by the thyristors S21 and S22 and the diodes D21 and D22 and applied to the headlamp 22.
The headlamp 22 lights up. At that time, the headlamp voltage control circuit 28 directly detects the voltage across the headlamp 22, and turns off the thyristors S21 and S22 when the detected voltage exceeds a predetermined voltage. Therefore, even if the generator 21 is not provided with an intermediate tap, the headlamp 22
The applied voltage can be controlled to a predetermined voltage, and the same operational effect as the conventional circuit can be obtained. In addition, because there is no intermediate tap,
The size can be reduced, and the manufacturing cost can be reduced.

Further, in the structure shown in FIG. 1, the headlamp voltage control circuit 28 configures a full-wave rectification circuit 30 for the headlamp so that the voltage applied to the headlamp 22 is within a predetermined voltage value. Thyristor S2
1. ON / OFF control of S1 and S22 is performed, and when the voltage applied to the headlamp 22 exceeds a predetermined voltage value, the thyristors S21 and S22 are turned OFF and open control is performed, so that a current flows as in the conventional case. In this case, heat generation of the generator 21 can be prevented, and the life of the generator 1 can be extended.

By the way, in the above-described embodiment, the headlamp voltage control circuit 28 and the battery voltage control circuit 29 are designed to operate independently, but there is a drawback that they operate independently.

For example, when the voltage of the headlamp 22 and the voltage of the battery 24 both drop below a predetermined voltage, the output of the generator 21 is the full-wave rectifier circuit 30 for the headlamp.
Also, the voltage is simultaneously applied to the headlamp 22 and the battery 24 via the full-wave rectification circuit 31 for the battery. In this case, the output capacity of the generator 21 is insufficient and the battery 24
In some cases, it may not be possible to apply a sufficient voltage.

Therefore, in the circuit shown in FIG. 1, if necessary, the headlamp voltage control circuit 28 and the battery voltage control circuit 29 are connected to each other by a signal line 40 for exchanging control signals. You may comprise so that it may interlock | cooperate.

In this case, the voltage detection signals detected by the headlamp voltage control circuit 28 and the battery voltage control circuit 29 are used with predetermined weighting. For example, the voltage detection signal of its own circuit is weighted with "1", and the voltage detection signal of the other control circuit is weighted with "0.3". It should be noted that these weightings may be appropriately set by examining the control characteristics of the headlamp voltage control circuit 28 and the battery voltage control circuit 29 in advance.

An example of control when the above weighting is performed will be described. Now, assume that the applied voltage of the battery 24 exceeds the predetermined voltage, but the applied voltage of the headlamp 22 is lower than the predetermined voltage. At this time, if the battery voltage control circuit 29 independently controls the energization of the battery 24, the duty of the battery thyristors S22 and S23 in the OFF state is increased or the thyristors S22 and S23 are completely turned off. . Then, due to the so-called armature reaction of the generator 21, the influence appears on the headlamp 22 side, and when the applied voltage of the headlamp 22 is increased by the headlamp voltage control circuit 28, the applied voltage of the headlamp 22 is temporarily reduced. There is a possibility that the voltage may rise above a predetermined voltage. On the other hand, as described above, in the case of weighting control, for example, the detected voltage of the battery voltage control circuit 29 is weighted with “0.3” and sent to the headlamp voltage control circuit 28. At this time, the headlamp voltage control circuit 28 sets the weighting of its own detection voltage to “1”, but does not perform the voltage increasing operation corresponding to this.
The voltage increasing operation of “1” − “0.3” = “0.7” is performed. This makes it possible to prevent the applied voltage of the headlamp 22 from rising above a predetermined voltage. Similarly, when the voltages of the headlamp 22 and the battery 24 are both low or high,
Voltage control with an appropriate distribution slope can be performed.

In the battery charging control circuit of the above embodiment, the case where the single-phase type generator is used has been described, but the same can be applied to the three-phase type generator.

[0028]

As described above, the present invention provides a charge control circuit for a battery, which controls the charging of the battery while lighting the headlamps with the electric power generated by the generator according to the rotation of the engine in the motorcycle or the like. Since the output of the generator is full-wave rectified and applied to the battery, the power output from the generator can be efficiently used to charge the battery, and the battery does not increase in size and cost, and The capacity of can be increased. Further, since the voltage of the headlamp is detected, and thus the power supply from the generator to the headlamp is controlled so that the voltage of the headlamp is within a predetermined voltage value, the generator coil is It is possible to apply a predetermined voltage to the headlamp without providing an intermediate tap. Moreover, the applied voltage of the headlamp is not controlled by the short-circuit control method, but by the open control method in which the headlamp voltage control means controls the energization to the headlamp itself, so that no current flows. The effect that the heat generation can be suppressed and the life of the generator can be extended is achieved. Further, if the full-wave rectifying means for the headlamp is provided and the two diodes forming part of the full-wave rectifying means for the battery and the headlamp are shared, the number of parts can be reduced. It is possible to reduce the cost.

[Brief description of drawings]

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

FIG. 2 Headlamp control / used conventionally
It is a circuit diagram which shows the example of a circuit for battery charge control.

[Explanation of reference numerals] 1 generator 1a middle tap 2 headlamp 3 charging control circuit 4 battery 5 load 6 headlamp voltage detection circuit 7 battery voltage detection circuit S1, S2 thyristor 21 generator 22 headlamp 23 charging control circuit 24 battery 25 DC load 26 Main switch 27 Fuse 28 Headlamp voltage control circuit 29 Battery voltage control circuit 30 Full-wave rectifier circuit for headlamp 31 Full-wave rectifier circuit for battery S21 to S24 Thyristor D21 to D24 Diode

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location H02M 7/06 Z 9472-5H

Claims (2)

[Claims] 1. A battery charge control circuit for controlling the charging of a battery by lighting a headlamp with electric power generated by a generator according to the rotation of an engine in a motorcycle, and full-wave rectifying the output of the generator. The full-wave rectifying means for the battery to be applied to the battery and the voltage of the battery are detected, and when the voltage is less than the predetermined charging voltage, the full-wave rectifying means for the battery charges the battery. Charging control means, and headlamp voltage control means for detecting the voltage of the headlamp and controlling the energization from the generator to the headlamp so that the voltage of the headlamp is within a predetermined voltage value. A charging control circuit for a battery, comprising: 2. A full-wave rectifying means for a headlamp for full-wave rectifying the output of the generator and applying it to a headlamp, wherein the full-wave rectifying means for the battery and the full-wave rectifying means for the headlamp are provided. 2. The battery charge control circuit according to claim 1, wherein each of the full-wave rectifying means is shared by two bridge circuits each including two thyristors and two diodes.