JP2001204103A - Charging device and charging method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a charging device and a charging method to make it possible to simplify its structure by charging first and second batteries having different rated voltages simultaneously. SOLUTION: When the rotor of a generator driven by an engine is rotated inside a stator, a three-phase AC is generated in each of windings 60a, 60b of three phases with each phase electrically displaced by 2±/3. The first three- phase full-wave rectifier circuit 81 of a charger rectifies with full-wave the three-phase AC of a 48 V system and converts it into the DC of the 48 V system to charge a high-voltage battery 73 with a charging current J1 that corresponds to the DC voltage of the 48 V system (current controlling system). The second three-phase full-wave rectifier circuit S2 of the charger rectifies with full-wave the three-phase AC of a 12 V system and converts it into the DC of the 12 V system to charge a low-voltage battery 53 with a charging current J2 that corresponds to the DC voltage of the 12 V system (float charging system). Both the high-voltage battery 73 and the low-voltage battery 53 are charged simultaneously.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charging device and a charging method for charging a plurality of batteries having different rated voltages.

[0002]

2. Description of the Related Art Heretofore, golf carts used in golf courses have been known as a type that runs on an internal combustion engine such as a gasoline engine and a type that runs on an electric motor (a so-called electric vehicle). I have.

Each of these golf carts uses a battery having a rated voltage of 12 V, which is generally used in automobiles. In recent years, vehicles equipped with a system equipped with a hybrid engine have been proposed.
Hybrid engines of a series hybrid engine type and a parallel hybrid engine type are known, and a vehicle equipped with a series hybrid engine generates power by an engine generator, charges a battery, and converts the charged battery into a battery. The vehicle can travel using the electric motor supplied with the electric power as a driving source for traveling. On the other hand, an automobile equipped with a parallel hybrid engine can run using both an internal combustion engine such as a gasoline engine or a diesel engine and an electric motor as a driving source for running.

[0004] Therefore, the electric motor of an automobile equipped with a series hybrid engine or a parallel hybrid engine as described above becomes a driving source for traveling.
Since it is necessary to generate a large torque, a relatively large one is used. Therefore, in order to supply power to such a large electric motor, a vehicle employing a hybrid system is provided with a 48V battery having a higher rated voltage, apart from a battery having a rated voltage of 12V. ing.

That is, in a vehicle employing a hybrid system, a 48 V battery for driving an electric motor serving as a driving source for driving, a controller for performing various controls such as vehicle speed control, and the like are used for control. Two batteries having different rated voltages, such as a 12V battery that supplies power to sensors and various electric components provided on the instrument panel and the like, are mounted.

[0006] The discharge amount of these two batteries is determined according to the power consumption of each load that supplies power, and it is necessary to charge each battery to compensate for the discharge amount. Therefore, the generator generates electric power based on the output of the engine, rectifies the AC with the charger, and converts the DC power to 48.
Charge V battery. On the other hand, a 12V battery is stepped down from 48V to 12V via a DC / DC converter and charged with the 12V power. Then, the electric motor is driven by the 48 V battery power, and the controller and the like are driven by the 12 V battery power.

[0007]

However, when charging two batteries having different rated voltages from each other, such as an automobile employing the above-described hybrid system, a battery having a higher rated voltage is charged by a charger. Charging and DC for low rated voltage batteries
It is necessary to charge via a / DC converter. Therefore, when charging two batteries, both a charger and a DC / DC converter are required, and there has been a problem that the configuration for charging is complicated.

An object of the present invention is to simultaneously charge first and second batteries having different rated voltages,
An object of the present invention is to provide a charging device and a charging method that can have a simple configuration.

[0009]

To achieve the above object, according to the first aspect of the present invention, a first battery having a low rated voltage is charged with electric power generated from a common power generating means. A gist is provided that includes a first charging unit and a second charging unit that charges a second battery having a high rated voltage, and that each charging unit simultaneously charges each battery.

Therefore, according to the first aspect of the present invention, the charging of the first battery by the first charging unit and the charging of the second battery by the second charging unit are performed simultaneously.
According to a second aspect of the present invention, in the first aspect, the first charging unit float-charges the first battery, and the second charging unit supplies a current to the second battery. The gist is that the battery is charged by control.

Therefore, according to the second aspect of the invention, in addition to the operation of the first aspect, the first battery having the low rated voltage is float-charged by the first charging section, and the second battery having the high rated voltage is charged. Is charged by current control by the second charging unit.

According to a third aspect of the present invention, there is provided a hybrid vehicle for charging a second battery for supplying power to a driving source for driving with power generated by a generator driven by an engine. 3. The charging device according to claim 1, wherein the first battery supplies electric power to an electric load other than the traveling drive source, and the second battery supplies a traveling drive. 4. It is intended to supply power to the power source. This hybrid traveling vehicle includes a series hybrid traveling vehicle and a parallel hybrid traveling vehicle.

According to the third aspect of the present invention, in addition to the operation of the first or second aspect of the present invention, when the generator driven by the engine generates electric power, the electric power is supplied to the first charging section. Charging the first battery and the second battery
The second battery is charged by the charging unit, the driving source for driving is driven by the electric power supplied from the second battery, and the hybrid traveling vehicle travels.

According to a fourth aspect of the present invention, the first battery having the low rated voltage is charged by the first charging unit with the power generated from the common power generating means, and the high charging power is charged by the second charging unit. The gist is that a second battery having a voltage is charged, and each of the charging units simultaneously charges each battery.

Therefore, the fourth aspect of the present invention has the same effect as that of the first aspect of the present invention. According to a fifth aspect of the present invention, in the invention of the fourth aspect, the first battery is float-charged by the first charging unit and the second battery is charged by current control by the second charging unit. And

Therefore, the fifth aspect of the invention has the same function as the second aspect of the invention. According to a sixth aspect of the present invention, power is supplied from the first battery to an electric load other than the driving source for traveling, and power is supplied from the second battery to the driving source for traveling. 6. The charging method according to claim 4 or claim 5, wherein the electric power generated by the generator driven by the engine is charged. The gist is that the first battery is charged by the charging unit and the second battery is charged by the second charging unit. This hybrid traveling vehicle includes a series hybrid traveling vehicle and a parallel hybrid traveling vehicle.

Therefore, the sixth aspect of the invention has the same function as the third aspect of the invention.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention embodied in a golf cart charging apparatus will be described below with reference to the drawings. FIG. 1 is a perspective view showing a multi-person riding (five-seater in this embodiment) type golf cart having front and rear seats, and FIG. 2 is a side view. In a golf cart 1 as a hybrid traveling vehicle, a front seat base 3 is provided at a front portion of a main frame 2 supporting a lower portion of a vehicle body, and a rear cowl 4 is provided at a rear portion. A driver's seat 11 and a passenger's seat 12 are provided on the upper part of the front seat base 3 so as to be divided into left and right.
Is provided between them. On the other hand, on the upper part of the rear cowl 4, a horizontally long rear seat 15 that can be seated by three persons in the left-right direction (the left-right direction is sometimes referred to as the vehicle width direction in the present embodiment) is provided via the rear seat stand 14. The golf cart 1 is designed for five people.

At the rear of the driver's seat 11 and the passenger's seat 12, a backrest 17 is provided via a seat stay 16, respectively. On the other hand, a horizontally long backrest 19 is provided at the rear of the rear seat 15 via a pair of seat stays 18. Assist bars 20, 21, and 22 are provided outside the driver seat 11, the passenger seat 12, and the rear seat 15, respectively.

Between the front seat base 3 and the rear cowl 4, a rear step 31 for a person sitting on the rear seat 15 is provided.
Is provided. On the other hand, in front of the front seat base 3, front steps 32 for the driver sitting on the driver seat 11 and the passenger sitting on the passenger seat 12 (in FIG.
(Only the front step 32 for a person sitting on the floor is shown). The front cowl 3 is located at the front end of the front step 32.
3 are provided integrally. A steering mechanism 34 such as a steering wheel is provided in front of the driver seat 11 so as to protrude from the front cowl 33. A brake pedal 35 and an accelerator pedal 36 are provided in front of the driver seat 11 under the feet. Have been. A pair of left and right front wheels 37 (only the left front wheel 37 is shown in FIG. 1) is suspended below the front seat base 3, and a pair of left and right rear wheels 38 (see FIG. In this figure, only the left rear wheel 38 is shown).

A pair of front pillars 41 extend upward above the front cowl 33. On the other hand, a pair of rear pillars 42 (only one side is shown in FIG. 1) formed integrally with the seat stay 18 extend upward above the backrest 19 of the rear seat 15. A roof 43 is supported between upper ends of the front pillar 41 and the rear pillar 42. Behind the rear cowl 4, a bag carrier 44 extends obliquely upward, and a golf bag can be placed thereon. Also, the bag carrier 44
A pair of storage cases 45 capable of storing umbrellas, putters and the like are provided on both left and right sides of the storage case 45.

Next, the drive system of the golf cart 1 is shown in FIG.
This will be described with reference to FIG. FIG. 3 is a side view showing a configuration of the main frame 2, and FIG. A sub-frame 51 is fixed to a central portion of the main frame 2 in a longitudinal direction (in the present embodiment, the longitudinal direction is sometimes referred to as a front-rear direction).
It extends rearward. A bracket 52 is fixed to a front portion of the sub frame 51, and on the bracket 52,
On the left side, a low-voltage battery 53 as a first battery
However, storage cases 54 are placed and fixed on the right side, respectively. The rated voltage of the low-voltage battery 53 of this embodiment is D
C12V (low rated voltage). Storage case 54
Inside, a charger 55 as a charging device, a generator 56 as power generation means, an engine 57, and a muffler 58 are arranged in this order from the front.

In the storage case 54, the engine 5
7, a starter motor (not shown) is provided, and each pulley (both not shown) fixed to the motor shaft of the starter motor and the output shaft of the engine 57, and a V belt (not shown) wound between the pulleys. No), the output from the starter motor is transmitted to the engine 57. Electric power is supplied to the starter motor from the low-voltage battery 53. Generator 56
Is a rotor 59 having N-pole and S-pole permanent magnets connected to the output shaft of the engine 57 and rotating integrally with the output shaft.
(See FIG. 6) Stator 60 provided with three-phase star winding
(See FIG. 7) and the like, and the rotor 59 is rotated based on the output from the engine 57, so that power can be generated. The charger 55 includes an AC / DC converter, and is configured to convert (rectify) an alternating current generated by the generator 56 into a direct current and charge the low-voltage battery 53 and a high-voltage battery 73 described later. .

At the lower part of the front end of the storage case 54, an intake hole (not shown) is formed which is open to the outside to take in external air. Provided air cleaner,
It is configured to be able to be introduced into an intake port of the engine 57 via an intake manifold (neither is shown). In the middle of the intake manifold, a carburetor (not shown) for mixing the intake air with fuel and introducing an air-fuel mixture to the engine 57 is provided.

An exhaust manifold (not shown) connected to an exhaust port of an engine 57 is provided at one end of a muffler 58 disposed at the rearmost side in the storage case 54.
And an exhaust rear pipe (not shown) opened to the outside of the storage case 54 is connected to the other end.

At the center of the rear end of the sub-frame 51,
A transmission case 61 containing a reduction gear and a differential gear mechanism (not shown) is fixed, and a rear axle 62 for the rear wheel 38 is provided below the transmission case 61. The rear end portions of the left and right sides of the main frame 2 rise obliquely upward and extend.
A rear sub-frame 66 extends from the rear.
An electric motor 67 as a driving source for traveling is fixed to the rear sub-frame 66. The electric motor 67 is a DC motor having a built-in drive circuit 68 (see FIG. 5).
Is rotated, and the rotation output can be transmitted to a gear mechanism in the transmission case 61. The storage case 54, the low-voltage battery 53, the transmission case 61,
The electric motor 67 is housed in the rear cowl 4 as shown in FIG.

A pair of bag carrier frames 71 are fixed to the left and right rear ends of the main frame 2 and the rear end of the rear subframe 66, and the bag carrier frames 71 extend rearward. A battery bracket 72 is fixed between the pair of bag carrier frames 71, and a high-voltage battery 73 as a second battery is mounted and fixed on the battery bracket 72. The rated voltage of the high-voltage battery 73 of the present embodiment is DC48V (high rated voltage).

As described above, the golf cart 1 of the present embodiment
Are two batteries 5 having different rated voltages from each other.
3 and 73, and an engine 57 and an electric motor 67. Then, based on the output from the engine 57, an AC is generated by the generator 56, and the AC is converted into a DC by the charger 55 to charge the low-voltage battery 53 and the high-voltage battery 73. The golf cart 1 drives various electric components (ICs such as the controller 75, a starter motor, etc.) other than the electric motor 67 with the electric power from the low-voltage battery 53, and also drives the electric motor 6 with the electric power from the high-voltage battery 73.
7 is driven and each rear wheel 38 is driven by a driving force of an electric motor 67 via a gear mechanism in a transmission case 61.

Next, a series hybrid system in the golf cart 1 will be described with reference to FIG. In the series hybrid system such as the golf cart 1 of the present embodiment, first, the controller 75 controls the engine 57.
Is performed, and the engine 57 is driven under the condition of the highest efficiency. Then, the generator 56 generates an alternating current based on the output from the engine 57, and the alternating current is input to the charger 55. The charger 55 rectifies the input AC and converts it into DC, and charges the low-voltage battery 53 and the high-voltage battery 73.

Here, the charger 55 is a low-voltage battery 53
In order to make the output voltage (rated voltage) of DC into 12 V DC, the input voltage of a value higher than DC 12 V (14 V DC in this embodiment) is applied to the low voltage battery 53 in consideration of the voltage drop in the low voltage battery 53. Apply to charge. On the other hand, the charger 55 sets the output voltage (rated voltage) of the high-voltage battery 73 to DC48V in consideration of the voltage drop in the high-voltage battery 73,
Charging is performed by applying an input voltage having a value higher than C48V (DC56V in the present embodiment).

The electric power of the low-voltage battery 53 is supplied to various electric components (electric loads including the controller 75) other than the electric motor 67. That is, in the present embodiment, a load (an IC, a starter motor, or the like) having a rated voltage of 12 V DC is used for various electric components (including the controller 75) other than the electric motor 67. On the other hand, the power of the high-voltage battery 73 is supplied to a drive circuit 68 built in the electric motor 67, and the drive circuit 6
8, the electric motor 67 is driven, and the rotation output of the output shaft 69 is transmitted to the transmission case 61. Then, after being reduced by the reduction gear built in the transmission case 61, the rear axle 62 is driven via the differential gear mechanism,
Each rear wheel 38 is driven. That is, the golf cart 1 of the present embodiment is a rear-wheel drive type, and each front wheel 37 is a steering wheel that is steered by operating the steering mechanism 34 (steering wheel operation).

Next, a method of charging the batteries 53 and 73 will be described with reference to FIGS. FIG. 6 is a schematic block diagram for explaining a method of charging each of the batteries 53 and 73, and FIG. 7 is a schematic electric circuit diagram showing a configuration of the charger 55.

For example, when the low-voltage battery 53 and the high-voltage battery 73 have been discharged to some extent due to, for example, the end of one round of golf play, it is necessary to charge the batteries 53, 73 to compensate for the amount of discharge. is there. In such a case, first, the high voltage battery 73 is
Control of the number of revolutions of the engine 57 according to the discharge amount of the engine 57. That is, when the discharge amount of the high-voltage battery 73 is large, the rotation speed of the engine 57 is increased, and when the discharge amount is small, the rotation speed of the engine 57 is reduced. And engine 5
7 is driven at a rotational speed corresponding to the amount of discharge of the high-voltage battery 73, and the generator 56 generates an alternating current based on the output from the engine 57.

The stator 60 of the generator 56 is provided with a three-phase star winding (see FIG. 7), and each phase is constituted by a first winding 60a and a second winding 60b. That is, the generator 56 of the present embodiment is a three-phase AC generator. In FIG. 6, the first winding 60a and the second winding 60b for one phase are shown for convenience of explanation.

The winding resistance ratio between the first winding 60a and the second winding 60b is 4: 1. One end of the first winding 60a is connected to the first input terminal 55a of the charger 55, one end of the second winding 60b is connected to the second input terminal 55b of the charger 55, and the other end of the first winding 60a. The other end of the second winding 60b is connected to a third input terminal 55c of the charger 55.
Therefore, based on the output from the engine 57, the
When the rotor 59 of FIG.
Each phase winding 60a, 60b is electrically 2π / 3
A three-phase alternating current having a phase difference occurs each time, and an alternating voltage according to the winding resistance ratio of the first winding 60a is applied to the first and third input terminals 5.
5a and 55c, an AC voltage according to the winding resistance ratio of the second winding 60b is applied to the second and third input terminals 55b and 55c.
5c. In the present embodiment, a 48-V three-phase AC voltage is applied between the first and third input terminals 55a and 55c, and a 12-phase AC voltage is applied between the second and third input terminals 55b and 55c.
A V-phase three-phase AC voltage is applied.

The charger 55 includes a first three-phase full-wave rectifier circuit S1 (including diodes D1 to D6) as a second charging unit for performing full-wave rectification of 48-V three-phase AC and converting it to 48-V DC. ), And a second three-phase full-wave rectifier circuit S2 (including diodes D7 to D12) as a first charging unit that performs full-wave rectification of the 12-V three-phase AC and converts it to 12-V DC. I have. The first output terminal 55 d of the charger 55 is connected to the + terminal of the high-voltage battery 73, the second output terminal 55 e is connected to the + terminal of the low-voltage battery 53, and the third output terminal 5
5f is connected to the negative terminal of the high voltage battery 73 and the negative terminal of the low voltage battery 53.

The charger 55 has first and third output terminals 55.
A DC voltage of 48 V (DC 56 V in this embodiment) is output from between d and 55 f, and a DC voltage of 12 V (DC 14 V in this embodiment) is output from between the second and third output terminals 55 e and 55 f. The first three-phase full-wave rectifier circuit S1 charges the high-voltage battery 73 by supplying a charging current J1 corresponding to the DC voltage of the 48V system, and the second three-phase full-wave rectifier circuit S2 performs charging. Then, the charging is performed by flowing the charging current J2 corresponding to the DC voltage of the 12V system to the low-voltage battery 53.

Here, the load using the power of the high-voltage battery 73 (the rated voltage is DC 48 V) is the electric motor 67, and the load using the power of the low-voltage battery 53 (the rated voltage is DC 12 V) is other than the electric motor 67. (E.g., IC such as controller 75, starter motor, etc.). That is, when the golf cart 1 runs, the amount of discharge of the high-voltage battery 73 that supplies power to the electric motor 67, which is a load that consumes a large amount of power, increases, and the amount of power consumption is small and a substantially constant load is applied. Control IC
Low-voltage battery 5 that supplies power to the motor and starter motor
3, the amount of discharge is small.

Therefore, in this embodiment, in order to compensate for the discharge amount of the high-voltage battery 73, the controller 75 controls the rotation speed of the engine 57 according to the discharge amount of the high-voltage battery 73, and based on the control, The charge current J1 flowing through the switch 73 is controlled. On the other hand, the low-voltage battery 53
Is not controlled in accordance with the amount of discharge of the low-voltage battery 53, but is not particularly controlled, and conforms to the rotation speed control of the engine 57. That is, in the 48V system, the first three-phase full-wave rectifier circuit S1 controls the high-voltage battery 7 by the current control method of controlling the charging current J1.
3 in the second three-phase full-wave rectifier circuit S2 by a float charging method (floating charging method) in which the charging current J2 is not controlled and the current control of the 48V system is performed in the 12V system. Charge 53. In this manner, the first and second three-phase full-wave rectifier circuits S1 and S2 of the single charger 55 simultaneously charge the batteries 53 and 73 having different rated voltages.

The field coil FC in FIG. 7 is a coil wound around the rotor 59, and is supplied from the low-voltage battery 53 via the key switch KS to the field coil F.
By passing a field current through C, an initial external excitation can be performed. On the other hand, the voltage regulator VR is for adjusting the voltage by changing the field current to increase or decrease the excitation.
In addition, the constant voltage circuit T connected between the + terminal and the − terminal of the low voltage battery 53 includes a second and third output terminals 55e,
This is for stabilizing a 12 V DC voltage (DC 14 V in the present embodiment) output from between 55 f and flowing a charging current J 2 according to the voltage to the low-voltage battery 53.

Therefore, according to the present embodiment, the following effects can be obtained. (1) In the present embodiment, charging of the low-voltage battery 53 by the second three-phase full-wave rectifier circuit S2 and charging of the high-voltage battery 73 by the first three-phase full-wave rectifier circuit S1 can be performed simultaneously. Possible configuration. Therefore, the low-voltage battery 53 and the high-voltage battery 73 having different rated voltages are simultaneously charged by the single charger 55. Therefore, when separate charging units are provided for charging the batteries 53 and 73, respectively. In comparison, the configuration of the charger 55 can be simplified.

(2) In this embodiment, the low rated voltage (DC
12V) is float charged by the second three-phase full-wave rectifier circuit S2 and has a high rated voltage (D
C48V) is charged by the first three-phase full-wave rectifier circuit S1 under current control. Therefore, in consideration of the power consumption of the load, the charger 55 charges the high-voltage battery 73 with a large amount of discharge by the current control method, and charges the low-voltage battery 53 with a small amount of discharge. By performing float charging, overdischarge and overcharge of the low-voltage battery 53 and the high-voltage battery 73 can be prevented.

(3) In this embodiment, when the generator 56 driven by the engine 57 generates power, the power is supplied to the low-voltage battery 53 by the second three-phase full-wave rectifier circuit S2.
And the high-voltage battery 73 is charged by the first three-phase full-wave rectifier circuit S1.
Is driven by electric power supplied from the high-voltage battery 73, and the golf cart 1 (series hybrid traveling vehicle) travels. In such a series hybrid traveling vehicle (golf cart 1), electric power can be supplied from the high-voltage battery 73 to the electric motor 67, and power can be supplied from the low-voltage battery 53 to electric loads other than the electric motor 67. Power can be supplied.

(4) In this embodiment, the DC12 used in the traveling system and the control system in the conventional golf cart is used.
Since the low-voltage battery 53 capable of supplying power to the V-system load is mounted, the DC12V-system load (for example, an IC such as the controller 75, a starter motor, etc.) can be continuously employed. Parts can be shared. That is, the low-voltage battery 5 of the present embodiment
When a battery having another rated voltage (for example, DC 24 V) different from the rated voltage (DC 12 V) of the DC power supply 3 is mounted, an expensive DC-D that converts DC 24 V to DC 12 V is used.
A C converter is required, which increases the cost of the golf cart, but this is not the case in the present embodiment.

The above embodiment may be modified as follows. In the above-described embodiment, the charger 55 is embodied to simultaneously charge the low-voltage battery 53 and the high-voltage battery 73 mounted on the golf cart 1 (series hybrid traveling vehicle) as the hybrid traveling vehicle. It may be embodied in a charging device as described above. In other words, the internal combustion engine such as a gasoline engine or a diesel engine and the electric motor have different rated voltages mounted on a traveling vehicle (parallel hybrid traveling vehicle) such as a parallel hybrid golf cart capable of driving the driving wheels. The present invention may be embodied in a charging device that charges a plurality of batteries simultaneously.

In the above embodiment, the charging device for the golf cart 1 is embodied. However, a plurality of batteries having different rated voltages from each other are mounted on a traveling vehicle other than the golf cart, for example, a buggy car, a go kart, or the like. May be embodied in a charging device that charges the battery at the same time.

In the embodiment, as the plurality of batteries having different rated voltages (low rated voltage and high rated voltage), the low-voltage battery 5 having a rated voltage of 12 V DC is used.
3 and a high voltage battery 73 having a rated voltage of 48 VDC.
However, a combination other than the combination of DC12V and DC48V may be used.

For example, a combination of a battery with a rated voltage of 12 V DC and a battery with a rated voltage of 24 V DC or 36 V DC may be used. In these cases, a battery with a rated voltage of 12 V DC is used as a battery for a load with a small power consumption and a substantially constant load (control IC, sensor, etc.), and a battery with a rated voltage of 24 V DC or 36 V DC is used for a load ( Motor, solenoid, etc.). In such a case, the same effect as the effect (4) in the above embodiment can be obtained particularly in the case of a battery charging device mounted on a golf cart.

In the above-described embodiment, the charging device (charger 55) for simultaneously charging two batteries 53 and 73 having different rated voltages is embodied. However, the rated voltages of at least two batteries are different. The present invention may be embodied in a charging device that simultaneously charges three or more batteries.

For example, the present invention may be embodied in a golf cart charging apparatus equipped with two batteries with a rated voltage of 12 V DC and one battery with a rated voltage of 48 V DC.
In this case, float charging is performed for each battery having a rated voltage of 12 V DC, and charging is performed by current control for a battery having a rated voltage of 48 V DC.

A battery with a rated voltage of 12 V DC, a battery with a rated voltage of 24 V DC, and a rated voltage of 48 V DC
May be embodied in a golf cart charging device equipped with one battery each. In this case, the rated voltage is D
Float charging is performed for a battery of C12V and a battery of rated voltage of DC24V, and the rated voltage is DC
The 48V battery is charged by current control.

[0052]

According to the first and fourth aspects of the present invention, the first and second batteries having different rated voltages are simultaneously charged, so that the configuration of the charging device can be simplified.

According to the second and fifth aspects of the present invention, in addition to the effects of the first aspect of the present invention, the first battery having a low rated voltage is float-charged. Since the second battery having a high rated voltage is charged by current control, overdischarge and overcharge of the first and second batteries having different rated voltages can be prevented.

According to the third and sixth aspects of the present invention, in addition to the effects of the first or second aspect of the present invention, in the hybrid traveling vehicle, the second drive source for the traveling drive source is provided. Power can be supplied from the battery, and the first load can be supplied to an electric load other than the driving source for traveling.
Power can be supplied from the battery.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a golf cart.

FIG. 2 is a side view showing a golf cart.

FIG. 3 is a side view showing the configuration of the main frame.

FIG. 4 is an essential part plan view showing a drive system and the like of the golf cart.

FIG. 5 is a schematic block diagram for explaining a series hybrid system.

FIG. 6 is a schematic block diagram for explaining a method of charging each battery.

FIG. 7 is a schematic electric circuit diagram showing a configuration of a charger.

[Explanation of symbols]

1 .... a golf cart as a hybrid traveling vehicle, 53
... a low-voltage battery as a first battery, 55 ... a charger as a charging device, 56 ... a generator as power generation means,
57: engine, 67: electric motor as drive source for traveling, 73: high voltage battery as second battery, S
1. First three-phase full-wave rectifier circuit as second charging unit, S2
... A second three-phase full-wave rectifier circuit serving as a first charging unit.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02J 7/32 B60K 9/00 E (72) Inventor Yasuo Noma 1-32 Chayamachi, Kita-ku, Osaka-shi, Osaka No. F-term of Yanmar Diesel Co., Ltd. (reference) 3D035 AA05 3G093 AA07 AA08 BA17 BA28 DB19 EA03 EB09 5H115 PA08 PC06 PG07 PI14 PI16 PI24 PI29 PI30 PO06 PO10 PU02 PU24 PU25 PU26 PV07 QE09 QE12 RB08 RE02 RE12 SE10 SE05 SE06 TI06

Claims (6)

[Claims] 1. An electric power generated from a common power generation means,
A first charging unit that charges a first battery having a low rated voltage; and a second charging unit that charges a second battery having a high rated voltage. A charging device for charging each battery. 2. The first charging unit float-charges a first battery, and the second charging unit includes a second charging unit.
The charging device according to claim 1, wherein the battery is charged by current control. 3. A charging device for a hybrid traveling vehicle that charges a second battery that supplies electric power to a driving source for traveling with electric power generated by a generator driven by an engine, The first battery supplies electric power to an electric load other than the traveling drive source, and the second battery supplies electric power to the traveling drive source.
Or the charging device according to claim 2. 4. The power generated from the common power generation means,
The first charging unit charges a first battery having a low rated voltage, and the second charging unit charges a second battery having a high rated voltage. A charging method comprising charging a battery. 5. A float charging of a first battery by the first charging unit, and a second charging of the second battery by the second charging unit.
The charging method according to claim 4, wherein the battery is charged by current control. 6. A power source is supplied from the first battery to an electric load other than the driving source for traveling, and an electric power is supplied from the second battery to the driving source for traveling. A method for charging a hybrid traveling vehicle that charges power generated by a generator driven by a generator, wherein the power generated by the generator is charged into the first battery by the first charging unit. The charging method according to claim 4, wherein the second battery is charged by the second charging unit.