JPH03212128A - Automatic charging device for power source of unmanned carrier - Google Patents

Abstract

PURPOSE:To shorten a charging time length of a storage battery for the title vehicle by a method wherein, battery to which a load is connected in a floating manner via a power supply mechanism and a filter, is connected to an output side of a capacitor charged to a high voltage from outside via voltage protection circuit. CONSTITUTION:A capacitor is charged to high voltage. Said capacitor constitutes a primary power source 6 being supplied with a power supply input from outside via voltage protection circuit 7. Said circuit 7 opens when an over-voltage or zero-voltage is detected. The control device 3 for power supply monitors and controls the voltage supplied to the capacitor 6 and the current being charged to a secondary power-source 10 and while preventing the over- discharging and over-charging of the secondary power-source 10, the device 8 supplies the secondary power-source part 10 and the load 3 with an optimum electric current. The capacitor 6 is charged with a high voltage power from a trolley (not shown) or by a plurality of stations 11, 12 installed on a passageway for an unmanned carrier.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a charging device that charges a battery power supply from the outside via a trolley.

(Prior Art) Automated guided vehicles used for freight transportation in factories and the like are usually driven by battery power, except for those driven by track type.

The conventional charging method for this battery power source is shown in Figure 2.
This will be explained with reference to FIG.

When the remaining capacity of the battery 1 mounted on the automatic guided vehicle is insufficient, a battery replacement method is used in which the battery 1 is replaced with a spare battery 2 at a station or evacuation center on the route, or the battery 1 is charged by a trolley while stopped at the station. Depending on the charging method.

The battery replacement method is a method in which power is supplied from the battery 1 to the load 3, and when its remaining capacity becomes insufficient, the battery is replaced with a spare battery 2.

In the trolley charging method, when the remaining capacity of the battery 1 is insufficient, power is supplied from an external power source. The charging device is equipped with a protection circuit 4 that prevents the power input from turning on and off when receiving power, and prevents short-circuit accidents.Also, when charging the battery, voltage fluctuations are directly applied to the load 3 due to an increase in battery voltage. An overvoltage protection circuit 5 is provided to prevent this from occurring.

(Problem to be Solved by the Invention) Battery replacement as a battery power charging method for such an automatic guided vehicle requires a large-capacity battery for an automatic guided vehicle that operates for a long time, and it is necessary to constantly prevent the battery voltage from dropping. It also needs to be monitored. Another disadvantage is that when replacing the battery, it requires many labor-intensive tasks such as handling a heavy battery and connecting connectors.

On the other hand, with the charging method using a trolley, it is necessary to charge the vehicle for a long time at the charging location because the vehicle is driven for a long time.

The present invention solves these problems in a short time.
The object of the present invention is to obtain a battery power charging device that can automatically charge the battery even while the transport vehicle is being driven.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a primary power supply unit including a capacitor that receives power from an external power supply via a trolley to charge the capacitor, and recharges the capacitor once again from this power supply. A secondary power supply section using a battery will be provided. A voltage protection circuit is provided in the primary power supply section, and a power supply control device and a filter circuit are further provided on the output side thereof.

A load is connected to the secondary power source section using a battery in a floating manner.

(Function) Electric power is supplied to the primary power supply section via the trolley, the power supply input section, and the voltage protection circuit. The voltage protection circuit controls external power input on/off, short circuit prevention, and trolley loading/unloading. Electric power from the primary power supply section is supplied to the secondary power supply section through a power supply control device and a filter circuit. The power supply control device monitors the power of the primary power supply unit, controls the primary side so that it does not drop below the discharge end voltage during power supply, and monitors the supply of overcurrent.

Note that if the capacitor in the primary power supply section has a higher rating than the battery in the secondary power supply section, the capacity of the capacitor can be reduced by charging many times in a short time.

(Example) The present invention will be described based on an example shown in FIGS. 1 and 4.

A primary power supply unit 6 using a capacitor, a voltage protection circuit 7 on the input side, and a supply power control device 8 and a waveform shaping circuit 9 on the output side.
A secondary power supply unit 10 made by BANOTERI is provided, and this is float-connected to a load 3 to constitute an automatic charging device.

This battery power source is charged from an external power source via a station or a running trolley (not shown) in the following manner.

A voltage protection circuit 7 of the primary power supply unit 6 monitors the voltage of the primary power supply unit 6, and pulls out the trolley when charging of the primary power supply unit 6 is completed or when charging is not possible due to a signal from an external sensor. In addition, in the event of a short-circuit accident in the power supply input section, it is configured with a function that instantly interrupts the input circuit using circuit breaker force.

The power supply control device 8 monitors and controls the voltage of the primary power supply unit 6 and the charging current to the secondary power supply unit 10, and prevents the voltage of the secondary power supply unit 10 from becoming lower than the discharge end voltage. The chopper section 10 has a control function that stops the supply when charging is completed, monitors the load current when charging while driving, and supplies the current necessary for charging the load 3 and the secondary power supply section 10. This is a device that drives and supplies food.

Incidentally, the current waveform shaping circuit 9 of the primary power supply section is constituted by an LC filter circuit.

In such a device, first, power from an external power source is supplied to the primary power supply section 6 via the voltage protection circuit 8 via the trolley.Next, the power supply control device 8 is controlled by the primary power supply section 6. Electric power is supplied (charged) to the secondary power supply section 7 by.

This device having such a configuration has the following functions.

In the case of charging by this automatic charging device, by increasing the voltage of the primary power source, it is possible to shorten the charging (supply) time of the secondary power source and reduce the charging current. The reason is as follows.

Now, determine the sign as follows.

vl...Primary power supply terminal voltage 11...Secondary power supply charging current■,...Secondary power supply section charging time■2...Secondary power supply terminal voltage■2...Secondary power supply supply current■ 2...If the secondary power supply operating time is the power energy consumed by the secondary power supply [2 is E2-V]
2 ・12・T2 (1) The time required for charging the secondary power supply from the primary power supply part ■1 is T* = (V2 /Vl)・(Ia /IS)・T
2 ·-(2) Similarly, the supply (charging) current 11 is also 11=(V2/Vl)-(T2/T, ), 1. -4
3).

This shows that the higher the terminal voltage of the primary power source, the shorter the time required for supply or the smaller the current.

Further, if the discharge end voltage v0 of the primary power source is set to v0≧v2, all the charges of the primary power source can be supplied to the secondary side.

Automatic charging will be explained based on the case of a transport vehicle with a primary power supply voltage of 100V and a secondary power supply voltage of 24V on the travel route shown in FIG.

It is assumed that the vehicle goes counterclockwise from station 11 to station 12 and returns to station 11, and the traveling time of the above route is 5 minutes. If the secondary power supply load current and the primary power supply current are the same value, the above equation (2) d(V2/
Vi) = 24/100. (12/II) =
By substituting IT, = 5 win, the electric power required for running can be obtained by charging for 1 n12 sec.

According to the above, 1m is charged by the trolley at charging station 11.
After charging 1n, put the trolley inside the car and go to Station 1.
2, the trolley is charged in a trolley section 13. At this time, if the vehicle speed is 5 m/-in, for example, the vehicle can be charged automatically by traveling 1 meter, storing the trolley in the vehicle when exiting the trolley section, and returning to the station 11.

As described above, this automatic charging device has the following characteristics.

1. The higher the terminal voltage of the primary power source, the smaller the battery charging time or charging current can be, and charging with a small current has the effect of extending the battery life.

2. Since the high-voltage primary power supply is not directly connected to the load, it is less susceptible to voltage fluctuations during charging.

3.l cycle (time to supply power to load without charging)
If the battery can be charged by the amount consumed each time, a battery as a secondary power source is not required.

〔Effect of the invention〕

As described above, by installing the primary power supply section and the secondary power supply section according to the present invention and increasing the voltage of the primary power supply section, it is possible to shorten the charging time and reduce the charging current, and to charge efficiently. It is possible to improve the operating efficiency of the transport vehicle.

Additionally, a small charging current has the advantage of extending battery life.

[Brief explanation of drawings]

Fig. 1 is an electrical circuit configuration diagram of a charging device according to the present invention, Fig. 2 is an explanatory diagram of a conventional battery replacement method, and Fig. 3 is the same.
FIG. 4, which is an explanatory diagram of a conventional battery charging method, is a traveling route diagram of an automatic guided vehicle. 3...Load 6...Primary power supply section 7...
Voltage protection circuit 8--Supplied power control device 9--Filter circuit 10--Secondary power supply section Cap Valve Shichinori Kensuke Chika Private patent attorney Ken Daishimaru 1s2 Figure 3

Claims (1)

[Claims] A capacitor that is charged externally and has a voltage protection circuit,
A power supply for an automatic guided vehicle, characterized in that a primary power supply section consisting of a power supply control device and a filter circuit connected to the output side is connected to a secondary power supply section consisting of a battery power supply connected to a load in a float manner. automatic charging device.