JPS6326994Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an electric circuit for a vehicle that uses a 48V power source.

[Conventional technology]

Generally, industrial vehicles, construction vehicles, and other vehicles use a 24V power source, but some vehicles use a 48V power source. The advantage of using a 48V power supply is that it is 1/2 that of using a 24V power supply, assuming the output of the main work equipment is the same.
This means that equipment, wiring, etc. can be made smaller and lighter. However, 48V equipment is more expensive than the commonly used 24V equipment, so 24V equipment is used for non-work equipment such as lamps and buzzers, and 48V equipment is used for main work equipment such as electric motors. is taken. An example of the electric circuit in this case will be explained with reference to the electric circuit diagram in FIG. 1 and the electric circuit diagram in FIG. 2. In Figure 1, one end of the 48V power supply 018a with four batteries connected in series is grounded to the vehicle body, and the 48V power supply 018a is divided into two.
Configures 24V power supplies 16 and 17, and 48V power supply 018a
Connect 24V devices a and b only to the power supply between the midpoint of
48V charger c and 48V device d between both ends of 18a
are connected. In Fig. 2, the 24V power supply 16,
In order to eliminate the imbalance of charging and discharging between 17
The 24V system uses 24V devices g and h by connecting resistors e and f between both ends of a 48V power supply 018b, respectively.

[Problem that the invention attempts to solve]

However, in such conventional vehicle electric circuits, for example, the conventional electric circuit shown in FIG.
There is a difference in the frequency of use between 24V power supplies 16 and 17,
This causes an imbalance in charging and discharging. Also, the car body
The potential difference with the other end of the 48V power supply 018a is 48V, and there is a problem that there is a risk of electric shock or the like due to the 48V power supply 018a. In addition, in the conventional electric circuit shown in Fig. 2, energy is wasted by the resistors e and f, and the potential difference between the vehicle body and the other end of the 48V power supply 018b is 48V, so electric shocks due to the 48V power supply 018b can occur. The problem is that there is a risk of

The present invention was proposed in view of the above circumstances, and its purpose is to eliminate the above-mentioned drawbacks of the conventional technology and to connect a 48V power supply with multiple batteries connected in series, 24V equipment, and 48V equipment. The purpose of the present invention is to provide an electrical circuit for a vehicle that eliminates the unbalance of charging and discharging between power sources without using wasteful energy, and reduces the risk of electric shock, etc.

[Means for solving problems]

For this reason, the present invention provides an electrical circuit for a vehicle that has a 48V power supply in which multiple batteries are connected in series, a 24V device, and a 48V device, by grounding the intermediate portion of the 48V power source to the vehicle body.
A 24V power source with a potential difference of 24V is configured, the 24V device and the 24V charger are connected to each of the 24V power sources, the 48V device is connected to the 48V power source, and the 48V device, the 24V device, and the
It features a switch that allows it to be used with a 24V charger at the same time.

[Effect]

With the above configuration, by turning on the switch, 48V devices can be connected to a 48V power source, and 24V chargers and 24V devices can be connected to a 24V power source, allowing 24V devices to be used. The resulting unbalanced discharge between the 24V power supplies is charged separately by each 24V charger. Also, the potential difference between the vehicle body and both ends of the 48V power supply is 24V.
becomes.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an electrical circuit diagram thereof. By grounding the midpoint of the 48V power supply 18 in which 12V batteries 1, 2, 3, and 4 are connected in series to the vehicle body through the line 5, the 24V power supply 1 is connected by the batteries 1 and 2.
6 and batteries 3 and 4 constitute a 24V power supply 17. In addition, the line 5 and between the batteries 2 and 3 can be disconnected by a switch 6, and by turning on the switch 6, 48V equipment,
24V devices and 24V chargers can be used at the same time. Lines 7 and 8 are connected to both ends of the 48V power supply 18.
is connected between the lines 7 and 8, that is, to the 48V power supply 18, for example, 48V devices 9 and 10 such as a starter and a motor are connected. Between lines 5, 7 and lines 5, 8
In other words, the 24V chargers 11 and 12 are connected to the 24V power supplies 16 and 17, respectively. In addition, there should be no lamps, buzzers, etc. between lines 5 and 7 and between lines 5 and 8.
Connect the 24V devices 13, 14, and 15 as necessary. Also, the potential of line 5 seen from the car body is 0V, therefore the potential of line 7 is -24V, and the potential of line 8 is 0V.
The potential of is +24V.

This embodiment is configured as described above, and has a 24V
By using the equipment each 24V power supply 16, 17
Even if unbalanced discharge occurs between the 24V power supplies 16 and 17, since independent charging currents are obtained by operating each 24V charger, unbalanced charging will not occur between the 24V power supplies 16 and 17. Furthermore, since the potential difference between both ends of the 48V power supply 18 when viewed from the vehicle body is 24V, there is little risk of electric shock, etc., unless lines 7 and 8 are touched at the same time.

[Effect of idea]

As described in detail above, according to the vehicle electrical circuit of the present invention, a 48V device can be used by being connected to a 48V power source. In addition, the midpoint of the 48V power supply is grounded to the vehicle body, and the potential difference between both ends of the 48V power supply as seen from the vehicle body is 24V, and the 24V charger and 24V
Even if a device is connected and a 24V device is used and there is an unbalance in discharging between the 24V power supplies, each 24V charger can obtain charging current separately, so there will be no unbalance in charging and discharging between the 24V power supplies. Does not occur. or,
The potential difference between the vehicle body and both ends of the 48V power supply is 24V, reducing the risk of electric shock.

Furthermore, the resistor required when connecting a 24V device to a 48V power supply is not required, which has the effect of eliminating wasted energy consumption.

[Brief explanation of the drawing]

1 and 2 are electrical circuit diagrams showing the electrical circuit of a conventional vehicle, and FIG. 3 is an electrical circuit diagram showing the electrical circuit of a vehicle according to an embodiment of the present invention. 1, 2, 3, 4...Battery, 6...Switch,
9, 10...48V equipment, 11,12...24V charger,
13, 14, 15...24V equipment, 16, 17...24V
Power supply, 18...48V power supply.

Claims (1)

[Scope of utility model registration request] A 48V power supply with multiple batteries connected in series,
In the electrical circuit of a vehicle that has 24V equipment and 48V equipment, by grounding the intermediate part of the 48V power supply to the vehicle body, a potential difference of 24V is created when viewed from the vehicle body.
Configure a 24V power supply, connect the 24V device and 24V charger to each of the 24V power supplies, and connect the 24V device and 24V charger to each of the 24V power supplies, and
Connect the 48V equipment to the power supply and
An electrical circuit for a vehicle, comprising a switch that enables simultaneous use of a 48V device, the 24V device, and the 24V charger.