JPS62185519A - Charger - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] purpose of invention (Industrial application field) This invention relates to a charger.

(Prior Art) Conventionally, as shown in FIG. 3, a charger for charging a forklift battery, for example, has a magnetic switch 2 between a three-phase AC power source as an external N source and a battery 1 of the object to be charged. , a transformer 3 and a three-phase diode rectifier circuit 4 are provided. Then, when a charge switch (not shown) is turned on, the electromagnetic coil 2a of the magnet switch 2 is excited by the magnet switch command circuit 5, the contactor 2b is turned on, and charging of the battery 1 is started.

When the charging progresses and the control circuit 6 determines that the voltage of the battery 1 has reached the specified battery voltage, the timer of the timer circuit 7 starts counting. Timer circuit 7
When the predetermined time required to charge the battery 1 has elapsed, the control circuit 6 responds to this by demagnetizing the electromagnetic coil 2a of the magnet switch 2 via the magnet switch command circuit 5 and opening the contactor 2b. It is designed to terminate charging.

Also, during charging, the power failure compensation circuit 8 constantly detects the voltage of the external power supply, and if the input is cut off or drops below the specified input voltage due to a power failure or accident, the magnetic switch command circuit 5 activates the contactor 2 of the magnetic switch 2.
b was opened to interrupt charging and at the same time interrupt the timer count of the timer circuit 7. Then, when the stop of the input is released or the input voltage returns to the specified value, the contactor 2b of the magnetic switch 2 is closed to resume charging, and the timer continues counting from the interrupted count number to complete the remaining charging time. It was supposed to charge up to.

(Problem to be Solved by the Invention) However, if charging is stopped during charging, the power of the battery 1 is consumed by running the forklift and cargo handling, and then charging is performed again, the contactor 2b of the magnetic switch 2 closes. Charging is started, but since the timer restarts counting from the interrupted count, the charging ends with the remaining charging time, resulting in the problem that the battery 1 is not sufficiently charged, resulting in insufficient charging.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, it is an object of the present invention to provide a charger that does not run out of charge even if charging is stopped during charging of an object to be charged and the charging is resumed after consuming the electric power of the object. be.

Structure of the Invention (Means for Solving Problems) In order to achieve the above object, a charging circuit for charging an object to be charged with an external power source, an input state detection means for detecting an input state of the external power source, A counting means for counting the charging time necessary for charging the object to be charged, and when it is determined that the input is interrupted based on the detection signal of the input state detecting means, the counting of the counting means is interrupted, and during this interruption, the external A charger comprising a count control means that causes the counting means to continue counting when it is determined that the input of power has been resumed, and resets the counting of the counting means when a mino j consumption signal of the object to be charged is input. The gist is as follows.

(Function) When the count control means determines that the input has been interrupted based on the detection signal of the input state detection means, it interrupts the counting of the counting means, and when it determines that the input of the external power supply has been resumed during this interruption. The counting means continues counting, and when the power consumption signal of the object to be charged is input, the counting means is reset.

(Example) Hereinafter, an example in which the present invention is embodied in a charger for charging a battery mounted on a forklift with a battery set will be described with reference to the drawings.

FIG. 1 shows an electrical circuit diagram of the charger, in which the magnetic switch 10 includes an electromagnetic coil 10a and a contactor 10 for each phase.
When the electromagnetic coil 10a is energized, each contactor 10b closes, and when the electromagnetic coil 10a is de-energized, each contactor 10b opens. A transformer 11 lowers a three-phase AC power source as an external power source applied from terminals R, S, and T to a voltage corresponding to the voltage of a battery 12 as an object to be charged, thereby forming a three-phase diode rectifier circuit 1.
Output to 3. This three-phase diode rectifier circuit 13 is composed of six diodes 14, and rectifies a three-phase AC voltage to output a DC voltage.

Further, the fuse 15 and two thermal relays 16 are used to protect the charger by cutting off overload current.

A charging circuit is constituted by these magnetic switch 10, transformer 11, three-phase diode rectifier circuit 13, fuse 15, and thermal relay 16, and the three-phase AC voltage input through terminals R, S, and T is supplied to battery 1 by this charging circuit.
It is converted to the rated DC voltage of 2.

The microcomputer 17 serving as input state detection means, counting means, and count control means operates based on a control program stored in a storage device 18. A charge switch 20 is connected to the microcomputer 17 via an interface 19, and when the charge switch 20 is operated, a signal to start charging is input to the microcombi coater 17. When the microcomputer 17 receives this signal, it excites the electromagnetic coil 10a of the magnet switch 10 and closes each contactor 10b.

A display device 21 is connected to the interface 19,
The microcomputer 17 causes the display device 21 to display the charging time and the on/off state of the charge switch 20 based on the count number of a counter described below at that time.

In addition, the microcomputer 17 has an interface 19.
The input voltages of the terminals R, S, and T are inputted through the terminals and the input voltages are calculated. Microcomputer 1
7 determines the input state of the power supply by determining this input voltage,
That is, it is determined that the input is cut off or the input voltage has decreased below the specified input voltage, and in that case, the electromagnetic coil 10a of the magnet switch 10 is de-energized and the contactor 10b is opened.

Further, the microcomputer 17 inputs the voltage of the battery 12 and calculates the battery voltage. When the microcomputer 17 determines that the battery voltage ■ has reached the specified battery voltage ■k, it starts counting using a built-in counter, and when the predetermined count, that is, the time required for charging, has elapsed, the magnetic switch 10 is activated. The electromagnetic coil 10a is de-energized and the contactor 10b is opened to terminate charging. Then, when charging is completed, the microcomputer 17 resets the count contents of the counter. In this embodiment, the initial value of the count of the counter is "0", and the number is increased over time.

Further, the microcomputer 17 always stores the count of the counter in the storage device 18 as count data. Further, the microcomputer 17 is configured to interrupt the counting operation of the counter if the input voltage is cut off or drops below a specified input voltage while the counter is counting.

The interface 19 is connected to a traveling cargo handling system switch 22 that is provided on the traveling lever and cargo handling lever of the forklift and detects whether or not the levers are operated. A lever is operated to input a traveling cargo dumping signal that drives the traveling cargo handling system controller 23 of the forklift. In this embodiment, this running load signal is used as a power consumption signal indicating the power consumption of the battery 12, and the microcomputer 17 is configured to input this signal.

Then, when the microcomputer 17 receives the forklift driving and unloading signal while the counter is interrupted, the contents of the counter are reset, that is, the count number is set to "0".

Note that a series of these counter control operations of the microcomputer 17 are performed based on program data stored in the storage device 18.

Next, the operation of the charger configured as described above will be explained based on FIG.
Connect. Then, when the charge switch 20 is turned on, the microcomputer 17 reads the count data stored in the storage device 18 and calculates the count number rOJ of the reset count at that time. at the same time,
The microcomputer 17 excites the electromagnetic coil 10a of the magnet switch 10, closes the contactor 10b, and starts charging the battery 12.

The microcomputer 17 causes the counter to start counting when the battery voltage V reaches the specified battery voltage ■k. When the count number of the counter reaches a count number corresponding to the required charging time, the electromagnetic coil 10a of the magnet switch 10 is de-energized by counting up.

Then, based on this de-energization, the contactor 10b opens and charging is terminated.

When the microcomputer 17 is powered off or drops below a predetermined input voltage during counter operation, the contactor 10b of the magnetic switch 10 opens, interrupting charging and interrupting the counting of the counter. Then, when the power supply is no longer cut off or the input voltage returns to a predetermined specified voltage, the microcomputer 17 closes the contactor 10b of the magnetic switch 10 and resumes charging. At this time, the microcomputer 17 causes the previously interrupted counter to re-count from the interrupted count number and charges the counter until the required charging time for counting up.

Further, when the charging of the battery 12 is interrupted, when a traveling load dumping signal of the forklift is inputted from the traveling cargo handling system switch 22, the counter is reset and the count contents are set to "O". Then, the forklift travels and cargo handling operations are performed.

Therefore, when charging is stopped while the battery 12 is being charged and the forklift is operated and charging is resumed after the battery 12's power is consumed, the reset count number "O" is retrieved from the storage device 18 as count data. Based on this content, charging will be started from the beginning, and there will be no shortage of charging when charging ends.

Note that this invention is not limited to the above embodiments,
For example, in the above embodiment, the driving signal of the forklift and the loading signal during cargo handling work are detected as the power consumption signal of the object to be charged, but the point is that when an operation that consumes the power of the battery 12 is performed. , any device may be used as long as it outputs a signal for resetting the contents of the counter.

Further, although the charger of the above embodiment is simply provided with the charge switch 20 for starting charging, it is also possible to separately provide a normal charging switch and an equal charging switch so that normal charging and equal charging can be selected as appropriate. good.

In this case, the content counted up by the counter is different, and the data is stored in advance in the memory device 18.

Effects of the Invention As described in detail above, according to the present invention, even if the charging of the charging device is stopped while the charging time is being counted by the counting device, the power of the object to be charged is consumed, and then the charging is resumed, the counting device does not stop charging. Since the count is reset, this provides an excellent effect of preventing the object to be charged from becoming insufficiently charged at the end of charging.

[Brief explanation of drawings]

FIG. 1 is an electric circuit diagram of a charger embodying the present invention, FIG. 2 is a flowchart for explaining the operation of the charger, and FIG. 3 is an electric circuit diagram of a conventional charger. In the figure, 10 is a magnet switch, 11 is a transformer, 1
3 is a three-phase diode rectifier circuit, 17 is a microcomputer, and 18 is a storage device.

Claims (1)

[Claims] 1. A charging circuit for charging an object to be charged with an external power source, an input state detection means for detecting an input state of the external power source, and a charging time required for charging the object to be charged. and a counting means, and when it is determined that the input is interrupted based on the detection signal of the input state detecting means, the counting of the counting means is interrupted, and when it is determined that the input of the external power supply is resumed during this interruption, the counting means is stopped. A charger comprising: a count control means that continues counting the count of the object to be charged, and resets the count of the counting means when a power consumption signal of the object to be charged is input.