JPH08182209A - Charging apparatus - Google Patents

Abstract

PURPOSE: To maintain (charge) batteries of many vehicles with only one charging apparatus. CONSTITUTION: A charging apparatus 1 comprises a charging circuit 2, eight charging plug sockets 7 provided in parallel in the charging circuit 2, a voltage sensor 9 provided in each charging plug socket 7, a plurality of battery relays 10 provided to each charging plug socket for closing or opening the connection with the charging circuit 2 and a control means 11. The terminal voltages of the eight batteries connected to each charging plug socket 7 are detected by the voltage sensor 9 of each charging plug socket 7. Detection result of the voltage sensor 9 is inputted to the control means 11. The control means 11 selects the battery having the lowest terminal voltage, closes only the battery relay 10 of the charging plug socket 7 connected with the battery and connects the battery to the charging circuit 2 for the charging. Thereafter, charging is sequentially activated from the battery of lower terminal voltage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charging device having a function of charging a plurality of batteries with one unit.

[0002]

2. Description of the Related Art A conventional charger is designed to connect and charge one battery. Therefore, in order to maintain (charge) the vehicle battery, one charger is required for each vehicle.

[0003]

Even in a snowplowing base having a large number of snowplows, such as a snowplowing base in a country, a prefecture, or a municipality, usually only one charger is provided at most.
A car that has a long off-season, such as a snowplow,
Battery maintenance requires a lot of time and labor. It has been extremely complicated and inefficient to perform maintenance on a large number of batteries using a conventional charger in such a snow removal base. In the case of poor maintenance, the specific gravity may not be restored due to natural over-discharging, and the product may be replaced with a new one every year.

An object of the present invention is to provide a charging device capable of maintaining (charging) the batteries of many vehicles by one unit.

[0005]

A charging device according to a first aspect of the present invention comprises a charging circuit, a plurality of charging outlets provided in parallel with the charging circuit and connected to respective batteries, and each of the charging outlets. A plurality of voltage sensors provided for each charging outlet to detect the terminal voltage of the battery connected to the charging outlet; and a plurality of voltage sensors provided for each charging outlet to open and close the connection between each charging outlet and the charging circuit. It has an opening / closing means and a control means for controlling the opening / closing means based on the terminal voltage of the battery detected by the voltage sensor so as to perform charging in order from the battery having the lowest terminal voltage.

[0006]

The terminal voltage of the plurality of batteries respectively connected to the plurality of charging outlets is detected by the voltage sensor of each charging outlet. The detection result of the voltage sensor is input to the control means. The control means selects a battery having the lowest terminal voltage and controls so that only the opening / closing means of the charging outlet to which the battery is connected is closed. The battery is connected to a charging circuit and charged. After that, the batteries are charged in order from the battery with the lowest terminal voltage.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a charging device of the present invention is shown in FIGS.
Will be described with reference to. First, referring to FIG. 14, the charging device 1
The configuration of will be described. The charging device has a charging circuit 2. The charging circuit 2 includes a noise filter 3 that removes noise.
And a rectifier circuit 4 and an inverter circuit 5. The charging circuit 2 receives an AC power source of 100V from the outside,
It outputs a direct current of 14V to 32V. The control means power supply 6 is
AC power of 100V is input from the outside, + 5V, -5
Direct currents of V and +12 V are output and supplied to the control means 11 described later.

A plurality of (eight in this embodiment) charging outlets 7 are connected in parallel to the charging circuit 2.
A battery of 12V or 24V is connected to each charging outlet 7.

The battery connected to each charging outlet 7 has a liquid level sensor 8 for detecting the amount of battery liquid. Each charging outlet 7 has a dedicated terminal for receiving the output of each liquid level sensor 8.

Each charging outlet 7 is provided with a voltage sensor 9 for detecting the terminal voltage of the connected battery.

The charging circuit 2 is provided in each charging outlet 7.
A battery relay 10 is provided as an opening / closing means for opening / closing the connection with.

The charging device 1 has a control means 11.
The control means 11 controls the battery relay 10 and the like based on the terminal voltage of the battery detected by the voltage sensor 9 and the like, and charges the plurality of batteries connected to the charging outlet 7 in ascending order of the terminal voltage. It has the function of.

The control means 11 has various circuits described below. The inverter control circuit 12 includes the charging circuit 2
The pulse width of the drive signal applied to the inverter circuit 5 is changed to change the voltage generated by the inverter circuit 5. The charging current detection circuit 13 measures the voltage drop in the resistor 14 provided on the output side of the inverter circuit 5 to detect the charging current. The open / close circuit 15 opens and closes the battery relay 10 of the charging outlet 7. The voltage detection circuit 16 detects the terminal voltage of each battery output by the voltage sensor 9 of the charging outlet 7. The sensor detection circuit 17 detects a signal output from the liquid level sensor 8 of the battery connected to the charging outlet 7. The ammeter display circuit 18 displays the current value during charging on the display unit.
The voltmeter display circuit 19 causes the display unit to display the voltage value during charging. The indicator lighting circuit 20 includes a red warning indicator 21
Light up. The indicator lamp lighting circuit 22 lights the green charging indicator lamp 23. The switch detection circuit 24 detects opening / closing of a test switch 25 (red button) provided for each charging outlet 7. The switch detection circuit 26 detects opening / closing of a charging switch 27 (green button) provided for each charging outlet 7.

The control means 11 performs C for various data processing.
It has a PU 30 (microcomputer). For example, C
The PU 30 inputs and outputs signals or data between the control means 11 and the outside via the various circuits and the like, performs data calculation in the control means 11, and further, according to the calculation result and the like, the present apparatus. It controls the devices and the like of the respective parts or outputs the calculation results and the like to the display part and the like of this device.

The charging device 1 having the control means 11 having the above-mentioned structure has various functions as described below. The control means 11 has a program for processing data in a predetermined procedure as a function achieving means for achieving / implementing these various functions. This program is incorporated in the CPU 30 of the control means 11 in advance. The CPU 30 controls each part of the apparatus based on this program to achieve various functions.

The charging device 1 has the following 12 functions. 1. Cycle charge function (Function 1) This is a function to charge the batteries of up to eight cars (24V cars) in order from the one with the lowest terminal voltage.

2. Manual charging function (function 2) This is a function that preferentially charges the battery specified by the charging switch. When the connection is removed, or when the amount of charge is practically acceptable (battery liquid specific gravity is about 1.25), normal cycle charging is automatically restored.

3. Time-division charging function (function 3) This is a function to prevent charging from being biased to a specific battery. When there is a battery that is insufficiently charged in addition to the battery that is currently being charged, the charging time required for one unit is limited and the charging terminal is switched. In addition, trickle charging (see function 6) that compensates for spontaneous discharge is stopped, the battery with the least charge is charged, and control is performed so that the eight batteries are evenly charged.

4. Overcharge prevention function (function 4) This function automatically stops charging when the battery terminal voltage reaches a specified value. Since the completion of charging is monitored by the CPU 30, it is possible to prevent the battery from being damaged due to overcharging.

5. Charging Completion Notification Function (Function 5) This is a function of notifying the completion of charging by turning on the charging indicator 23 when the battery is fully charged. When the battery terminal voltage reaches the specified value, the charging indicator lamp 23 is turned on to inform that the charging is completed. When the battery is being charged, the charging indicator light 23 blinks to inform that the battery is being charged.

6. Trickle charging function (Function 6) This function recharges when the charge level drops. When the terminal voltage of the battery falls below the set value due to spontaneous discharge, recharging starts.

7. Automatic charge stop function (function 7) When all connected batteries are fully charged,
This is an energy-saving function that saves energy by turning off the power supply of the charging circuit 2. When all the connected batteries are fully charged, the power of the charging circuit 2 is turned off to minimize the power consumption. However, since the monitor is operating, when the terminal voltage decreases due to natural discharge or the like, the power of the charging circuit 2 is turned on again to perform trickle charging (see function 6).

8. Battery deterioration monitor function (Function 8) This function checks the deterioration of the battery. If the battery is not fully charged even if the integrated charging time reaches the specified value, it is considered that the battery has deteriorated and the warning indicator lamp 21 is turned on.

9. Protective function (Function 9) This function limits the charging time to about 5A. Even if a load is connected due to forgetting to turn off the engine key or the like, the output current is limited to about 5 A, and damage to the device is avoided.

10.12V / 24V automatic vehicle discrimination function (function 10) The CPU 30 monitors the terminal voltage of the battery,
It automatically distinguishes whether it is a 12V car or a 24V car and charges it.

11. Battery fluid decrease check function (function 11) The battery fluid level sensor 8 detects that the battery fluid is below a specified level, and the warning indicator lamp 21 is turned on.

12. Safety function (function 12) This function calls a warning buzzer to call attention when the engine is started with the battery connected to the charging outlet. When the engine starter is turned on, the battery terminal voltage drops sharply, and when the engine is started next, the battery terminal voltage increases sharply due to the voltage of the generator. By detecting this voltage, the driver is informed that the battery is connected to the charging outlet by using the display lamp and the buzzer in the garage.

Next, a program which is a data processing procedure for realizing the various functions will be described. The flow of the program of the charging device 1 is roughly divided into execution of initialization, execution of main routine, and execution of subroutine. The main routine is a program that calls subroutines to be executed in a fixed order. The subroutine is a program showing an actual processing procedure performed to realize each of the functions. The initial setting is executed only once immediately after the power is turned on. FIG. 1 is a flow chart showing initialization and a main routine. 2 to 13 are flowcharts showing the subroutine.

In the initial setting shown in FIG. 1, internal processing peculiar to the CPU is performed. The contents are as follows. 1. Initial setting of I / O port 2. Initial setting of CPU register 3. Initial setting of timer 4. Initial setting of memory (RAM) 5. Numerical display LED / indicator test display Numerical display counts down from 9 to 0. All display lamps are lit.

The main routine, which is a loop below the initial setting in FIG. 1, is executed once every 0.02 seconds, and each subroutine is called in a fixed order. The processing in the subroutine is performed in the following order. 1. Read input data 2. Data processing 3. Output of processed data

Input data is read. The data to be input from the switches, sensors, etc.
It is read through the / O port and recorded in internal memory. The data includes digital data and analog data.

In the subroutine (1) shown in FIG. 2, three kinds of digital data are read from the charging switch 27, the test switch 25 and the liquid level sensor 8. Each data corresponds to 8 batteries and is read into the memory as 1 byte (8 bits) of data.

Next, in the subroutines (1) and (2), two types of analog data of current and voltage are read. FIG.
The charging current of each battery is read in the subroutine (2) shown in. 0. provided in series with the charging line.
The voltage drop of the 1Ω resistor 14 is amplified, A / D converted, and read as 1-byte numerical data. The average value obtained by integrating this 16 times is used as the charging current value.

In the subroutine (3) shown in FIG. 4, the charging voltage of each battery is read. The voltage of each battery is A / D converted (analog-digital conversion) and read as 1-byte numerical data. The average value obtained by integrating this 32 times is used as the terminal voltage of each battery. The data of the charging voltage value corresponds to eight batteries. In addition, when integrating, it also determines whether there is no connection, 12V car, 24V car,
Set the connection flag and the 12V vehicle flag.
Data for 12V vehicles is doubled and converted to 24V data for integration.

After reading the data, the data is processed. Various judgments are made based on the data loaded in subroutines (1) to (3), display data and output data are generated, and the results are set in memory. The CPU 30 performs the following processing.

In the subroutine (4) shown in FIG. 5, the procedure for achieving the function 11 is executed and the liquid level sensor determination is performed. In the liquid level sensor determination, if the battery is connected and the liquid level sensor 8 is OFF, the warning indicator lamp 2
1 (red lamp) is set to ON. In the battery deterioration determination, if the charge capacity exceeds 150 Ah and the terminal voltage is 25 V or less, it is determined that the battery is deteriorated. If it is determined that the battery is deteriorated, the internal flag is set and the warning indicator lamp 21 (red lamp) is flashed with reference to the time of the general-purpose timer. Since this determination is made after the determination by the liquid level sensor 8, the display has priority over the liquid level sensor determination.

In the subroutine (5) shown in FIG. 6, the procedure for achieving the function 12 is executed and the starter alarm judgment is performed. In the starter alarm determination, if the alarm flag is OFF, the present and past voltages of the integrated terminal voltage are compared, and if (past-present) is 1 V or more, the alarm flag is set and charging is stopped at the same time. . If the alarm flag is ON, it is determined whether or not the charging switch 27 (green button) is pressed, and if it is pressed, the alarm flag is reset. Next, referring to the alarm timer, if 10 minutes have passed, the alarm flag is reset as well. Further, the current terminal voltage is checked, and if it is 0 V, it is judged that the battery connection is disconnected and the alarm flag is reset. If the alarm flag is still set after the above judgment, the external alarm output relay 28 is turned on in the subroutine (12) shown in FIG. 13, and the red / green lamps of the corresponding battery number blink according to the time of the general-purpose timer. .

In the subroutine (6) shown in FIG. 7, the procedure for achieving the functions 3, 4, 5, 7, 8, 9 is executed, and the charge start judgment is made. If charging is currently on standby and the alarm flag is OFF, it is determined whether charging has started. The lowest voltage excluding the battery terminal voltage of 0V is picked up, and when the lowest voltage exceeds 25.2V, the standby state is set.

If the minimum voltage is 25 V or less, the normal charge flag is set and the next data is set in the memory. Charging time 8 hours Charging current 5A ± 0.2A Applicable battery relay ON Charging timer clear

If the minimum voltage is higher than 25 V and lower than 25.2 V, the trickle charge flag is set and the next data is set in the memory. Charging time 4 hours Charging current 2A ± 0.2A Applicable battery relay ON Charging timer clear

In the subroutine (7) shown in FIG. 8, the procedure for achieving the function 2 is executed, and the charge switching determination is performed. If the alarm is not currently issued, the input data of the charging switch 27 is checked. If the charging switch 27 is pushed and the battery is connected to the pushed switch number, the charging is started / terminated / switched according to the following judgment. That is, when the battery is connected to the pressed switch number when the battery is currently waiting for charging, the normal charging start flag is set. If charging is currently being performed and the pressed charging switch 27 matches the battery number being charged, the charging flag is reset and charging is stopped. If they do not match, the charging flag of the battery being charged is reset, the flag of the pressed battery is set, and charging is switched. If the battery is not connected, the input from the charging switch 27 is ignored. When a plurality of charging switches 27 are pressed, a lower number is given priority.

In the subroutine (8) shown in FIG. 9, the procedure for achieving the function 6 is executed and the charge control is performed. If the charge flag is reset, do nothing. If it is set, the processing will be performed in the following order 1) to 3).

1) Judgment of Charge Termination Termination judgment is performed based on the following criteria. That is, the initially set time is compared with the charging timer, and if the specified time has elapsed, the charging is ended. The terminal voltage is 31V (15V for 12V cars.
If it is 5 V or more, stop. If it is 6A or more even for an instant, stop.

2) Terminal Voltage Judgment When the charging current is 2 A or more and the terminal voltage is 29.5 V or more, the charging current comparison data set at the start of charging is temporarily reduced. If the upper limit becomes less than 2A, no further reduction is performed.

3) Charging current control It is judged whether the charging current is within the set range, and if it is below the specified value, it is increased, and if it is above it, it is decreased. In 2) "Terminal voltage judgment", the specified value itself is decreased, but in the charging current control, the output data is changed.

Data is output. The data processed in the CPU 11 and stored in the memory is read out,
Charge indicator 23, warning indicator 2 via I / O port
1, is output to the LED display devices 29a and 29b, the battery relay 10 and the like. All visible parts are digital data, but charging current control data is D / A
It is analog data that has been converted (digital-analog conversion).

The objects to which digital data is output and the digital data are as follows. Charging indicator light 23 (green lamp) 8 bits Warning indicator light 21 (red lamp) 8 bits LED display device 29a, 29b 4 bits x 5 Battery relay 10 (for charging) 8 bits External warning output relay 28 1 bit Inverter output relay 1 bit

In the subroutine (9) shown in FIG. 10,
Data is output to various indicators, and the charging indicator 23, the warning indicator 21, and the LED display devices 29a and 29b are turned on. For example, in the charge status display, as described above, in the subroutine (6), energization charging / trickle charging /
When the standby state is determined, the blinking of the charging indicator lamp 23 is set. The charging status is determined by an internal flag, and the blinking interval is determined by referring to the time of a general-purpose timer. In addition, if the voltmeter / ammeter display is currently charging, the integrated voltage / current data is converted into display data and set in a predetermined memory. Display of current and voltage is performed by LED display devices 29a, 29
in b. If not charging, set all to "0".

In the subroutine (10) shown in FIG. 11,
Test switch determination is performed. The input data of the test switch 25 is checked, and if pressed, the corresponding data is set in the display format and set in the output memory and output. Since this processing is performed after the display processing of the voltmeter / ammeter, the test switch display is prioritized in the display on the LED display devices 29a and 29b.

In the subroutine (11) shown in FIG. 12,
A signal is output to the battery relay for charging. The signal to activate the battery relay is the subroutine (6)
, (7), (8).

In the subroutine (12) shown in FIG. 13,
The alarm output is output to the external alarm output relay 28. The alarm output is output in the subroutine (5).

The analog data is for controlling the charging current, and the charging current is controlled in the following order. 1) The CPU 11 outputs digital numerical data (1 byte) to the D / A conversion circuit. The D / A conversion circuit converts this into a voltage. The following processing is performed by hardware. 2) The converted voltage is input to the PWM (pulse width modulation) circuit provided in the inverter control circuit 12. PW
The M circuit emits a pulse having a constant frequency (25.6 KHz), and its pulse width changes according to the input control voltage. 3) The pulse output from the PWM circuit drives the drive circuit provided in the inverter circuit 5. 4) The inverter circuit 5 is a switching element (power MO
S-FET) enables high speed switching transformer
A voltage is generated on the secondary side by N-OFF. 5) Rectify the voltage on the secondary side to charge the battery. C
By changing the output data of the PU 11, the pulse width is changed, the voltage on the secondary side of the switching transformer provided in the inverter circuit 5 is changed, and as a result, the charging current can be controlled.

With the above structure, the charging device has the following functions. 1) Charge control function 2) Status display function 3) Maintenance data display function

1) Charging Control Function The purpose of the charging device 1 is to maintain the batteries installed in a plurality of vehicles in the best condition under an unattended environment for a long time. Therefore, various controls are performed to prevent charging from becoming impossible even if there is an abnormality in the power supply environment.

1. Charging types There are the following two types of charging. A. Normal charge This is a method in which the charge current is set to 5 A ± 0.2 A and charging is continued for 8 hours. However, when the charging voltage exceeds 29.5V, the charging current is gradually reduced, and finally is reduced to about 2A. Further, when the terminal voltage becomes 31 V or more, the battery is fully charged, so that the charging is completed even if the charging time is within 8 hours. B. Trickle charge (supplementary charge) This is a method in which the charge current is set to 2 A ± 0.2 A and charging is continued for 4 hours. Complementary charging is charging for a battery having a charging capacity of 80% or more to compensate for a decrease in capacity due to spontaneous discharge or the like. In this case as well, when the terminal voltage becomes 31 V or more, the battery is fully charged, and thus the charging is completed even within 4 hours.

2. Starting charging There are two ways to start charging: automatic charging and manual charging. In the automatic charging, if the battery is connected to the charging outlet 7, the control means 11 determines the state of each battery to charge the battery, so that it is not necessary to set anything. If the power is restored even if a power failure occurs during charging, charging will start again as usual. A. Automatic charge start If no battery is currently being charged, the terminal voltage (1
If it is 2V, it is converted to 24V) and the charging is started from the lowest battery. At that time, if the terminal voltage is less than 25 V, normal charging is performed, and if it is 25 V or more and less than 25.2 V, trickle charging is performed. B. Manual charging start When the battery is connected and the charging switch 27 (green button) of the battery which is not currently being charged is pressed, normal charging is started. In that case, if there is a battery being charged, charging of that battery is stopped. In manual charging, normal charging is performed regardless of the terminal voltage.

3. Termination or termination of charging The termination or termination conditions are as follows. A. 8 hours for normal charging and 4 hours for trickle charging. B. When the terminal voltage exceeds 31V. C. When the charging switch 27 (green button) of the battery being charged is pressed. Or when the charging switch 27 other than the battery is pressed during charging. D. If the battery is disconnected during charging. E. FIG. If the charging current exceeds 6A even during charging. F. When the engine is started during charging.

4. Control during charging The following controls are performed during charging to prevent equipment damage due to overcurrent and to prevent battery deterioration due to overcharging. A. Monitoring of charging time Monitor the charging time to finish charging when the specified time is reached. B. Monitoring of charging current The charging current is monitored and charging is stopped if it exceeds 6A even for an instant. Also, the charging current is controlled so that it falls within the specified range. In normal charging, when the charging voltage rises above the regulation, the charging current is sequentially reduced. C. Monitoring of charging voltage Stop charging if the charging voltage exceeds 31V. Also, if there is a sudden voltage drop, charging is stopped.

2) Status Display Function The charging device 1 displays the current charging status and battery status to facilitate device management and battery management. Each status display will be described below. 1. Charge status display The following displays are displayed according to the charge status. A. Charging indicator light 23 (green lamp) for the battery being charged is 1
Flashes every second. Illumination of the charging indicator light 23 (green lamp) of the battery which is not being charged represents full charge. The LED display devices 29a and 29b display charging voltage and charging current, respectively. B. Trickle charging The charging indicator light 23 (green lamp) of the battery being charged is 1
Turns on for 2 seconds and turns off for 3 seconds. Illumination of the charging indicator light 23 (green lamp) of the battery which is not being charged represents full charge. L
The ED display devices 29a and 29b display the charging voltage and the charging current, respectively. C. Charging is prohibited When normal charging / trickle charging is completed, this state is maintained for about 10 seconds. The battery whose charging indicator light 23 (green lamp) is lit represents a full charge. The LED display device 29a showing voltage shows 000, and the LED display device 2 showing current.
9b displays 00. D. Waiting for charging This state occurs when all batteries are fully charged.
The charging indicator light 23 (green lamp) is turned on for 3 seconds and turned off for 1 second. The LED display device 29a showing the voltage shows 000,
The LED display device 29b indicating the current displays 00. E. FIG. When there is no connected battery All charging indicators 23 (green lamp) and warning indicators 21
(Red lamp) goes off. LED display device 2 showing voltage
9a shows 000, LED display device 29b showing current
Displays 00.

2. Battery status display A. Battery deterioration display Accumulated charge capacity exceeds 150Ah, and terminal voltage is 2
When the voltage is 5 V or less, the warning indicator lamp 21 (red lamp) is 0.5
Flashes every second. This display has priority over the next low battery fluid level display. B. Low battery level display Warning indicator lamp 21 (red lamp) lights up. However, it is turned on even when the liquid level sensor 8 is not connected. It will not light if the battery is not connected.

3. Warning display When the engine is started with the battery connected to the charging device 1, a warning display is displayed when the charging current exceeds 6A even for an instant. It may also come out if the battery being charged is disconnected before the end of charging. The warning is displayed when the terminal voltage drops by 1 V or more within 1 second and when the charging current instantaneously becomes 6 A or more.
Therefore, if the requirements other than the above are met, a warning may appear. To cancel the display, press the charging switch 27 (green button). The warning display is the charging indicator light 23 (green lamp) and the warning indicator light 21 of the battery number that caused the warning.
Both (red buttons) blink twice per second. Further, the power of the warning output outlet 33 is turned on.

3) Maintenance data display function This function displays charge progress data and is useful for battery maintenance. For example, the battery deterioration display is a rough guide because it assumes the charge capacity from the fully discharged battery of 100 Ah to full charge, but if you use this function, the actual accumulated charge capacity (Ah) will be displayed. Since it is possible to know, it is possible to judge the state corresponding to the capacity of the connected battery.

As a display method, the test switch 25 (red button) is pushed first, and then the charging switch 27 (green button) is pushed. When ending, the charging switch 27 (green button) is released first. If the charging switch 27 (green button) is pushed first or the test switch 25 (red button) is released afterwards, the charging will be switched. 1. Terminal voltage display Press the test switch 25 (red button) for the battery number (or the number of the charging outlet 7) you want to display. It is not necessary to press the charging switch 27 (green button) only in this mode. If there is a battery being charged, the terminal voltage will be displayed slightly higher. If you want to display the correct voltage, charge the battery and then do it.

2. Accumulated charging time (hours) Red button 1 out of 8 test switches 25 (red button) (first of 8 test switches corresponding to charging outlet or battery. Red button 2 as well) , 3 ..., etc.) while pressing the charging switch 27 (green button) of the battery to be displayed. The unit is "time", and the LED that combines the voltage display frame and the current display frame
It is displayed in five digits on the display devices 29a and 29b.

3. Cumulative charging time (minutes / seconds) While pressing the red button 2, press the charging switch 27 (green button) of the battery you want to display. The unit is “minute” for the LED display device 29a of the voltage display frame and “second” for the LED display device 29b of the current display frame.

4. Integrated charging time (Ah) While pressing the red button 3, press the charging switch 27 (green button) of the battery you want to display. The unit is "Ah",
LED display device 29 combining the voltage display frame and the current display frame
It is displayed with 5 digits of a and 29b.

5. Past terminal voltage (V) While pressing the red button 4, press the charging switch 27 (green button) of the battery to be displayed. The unit is “V” for the LED display device 29a of the voltage display frame, and the LED of the current display frame
The display device 29b remains displaying the current charging current.
The past terminal voltage is used as a criterion for the starter alarm issuance and represents the terminal voltage about 1.2 seconds before.

6. A / D converted voltage (V) While pressing the red button 5, press the charging switch 27 (green button) of the battery to be displayed. The unit is “V” for the LED display device 29a of the voltage display frame, and the LED of the current display frame
The display device 29b remains displaying the current charging current.
In normal voltage display, A / D conversion (analog-digital conversion) is performed every 0.02 seconds, and this is integrated 32 times and the average value is displayed. It is data.

7. Ammeter-related data While pressing the red button 6, press the charging switch 27 (green button). The data displayed differs depending on the number of the charging switch 27 (green button) pressed. The data contents are briefly described below. The number is that of the charging switch 27 (green button). 1) Number of A / D conversion voltage integration 2) Charging current upper / lower limit 3) Charging end voltage / time 4) Latest charging current / past 5) Charging current during integration / number of integration 6) A / D conversion current value

8. Timer-related data While pressing the red button 7, press the charging switch 27 (green button). The data displayed differs depending on the number of the charging switch 27 (green button) pressed. The data contents are described below. The number is that of the charging switch 27 (green button). 1) General-purpose timer (second, 1/100 second) The unit is the LED display device 29a of the voltage display frame is "second",
LED display device 29b of the current display frame is "1/100 second"
Represents 2) General-purpose timer (hour / minute) The unit is "hour" when the LED display device 29a of the voltage display frame
Then, the LED display device 29b of the current display frame represents "minute". 3) General-purpose timer (number of days) The unit is the five-digit "day number" including the LED display device 29a of the voltage display frame and the LED display device 29b of the current display frame. This number of days represents the number of days that have passed since the power was turned on, and can be displayed up to 65535 days. 4) Alarm timer (minute / second) The unit is the LED display device 29a of the voltage display frame is "minute",
The LED display device 29b of the current display frame represents "second". When the starter alarm is issued, it is counted up to 10 minutes unless the charging switch 27 (green button) is pressed. 5) Charging timer (minute / second) The unit is the LED display device 29a of the voltage display frame is "minute",
The LED display device 29b of the current display frame represents "second". 6) Charging timer (hour / minute) The unit is "hour" when the LED display device 29a of the voltage display frame
Then, the LED display device 29b of the current display frame represents "minute". The charge timer is cleared at the start and end of charging,
It is counted up as time passes. The charging elapsed time is indicated during charging, and the standby elapsed time is indicated during standby. In addition, it is up to 8 hours during normal charging and up to 4 hours during trickle charging, but is undefined during standby.

9. Memory display While pressing the red button 8, charge switch 27 (green button)
Press. The charging switch 27 (green button) operates as a toggle switch, a plurality of buttons can be turned on and off, and the memory contents are displayed by the combination of the charging switch 27 (green button) that is pressed. The content is displayed in 1-byte units and is displayed by the same operation as in the case of the maintenance data display function described in 1 to 8 above.

The charging device 1 also has a battery checker function for carrying out a load test with the battery mounted on the vehicle.
When a specified load (a load current of about 10 A) is connected to the charging outlet 7 and the test switch 25 is pressed, the load voltage and the no-load voltage of the connected battery are measured, and the voltage difference is a specified value. The warning indicator lamp 21 indicates the exceeded battery.

[0073]

According to the charging apparatus of the present invention, the batteries connected to a plurality of charging outlets can be charged in order from the one with the lowest terminal voltage, so that one vehicle can maintain the batteries of many vehicles. The effect of being able to (charge) is obtained.

[Brief description of drawings]

FIG. 1 is a flowchart showing a main routine in an embodiment of the present invention.

FIG. 2 is a flowchart showing a subroutine (1) in one embodiment of the present invention.

FIG. 3 is a flowchart showing a subroutine (2) in one embodiment of the present invention.

FIG. 4 is a flowchart showing a subroutine (3) in one embodiment of the present invention.

FIG. 5 is a flowchart showing a subroutine (4) in one embodiment of the present invention.

FIG. 6 is a flowchart showing a subroutine (5) in one embodiment of the present invention.

FIG. 7 is a flowchart showing a subroutine (6) in one embodiment of the present invention.

FIG. 8 is a flowchart showing a subroutine (7) in one embodiment of the present invention.

FIG. 9 is a flowchart showing a subroutine (8) in one embodiment of the present invention.

FIG. 10 is a subroutine (9) in one embodiment of the present invention.
It is a flowchart showing.

FIG. 11 is a subroutine (10) in one embodiment of the present invention.
It is a flowchart showing.

FIG. 12 is a subroutine (11) in one embodiment of the present invention.
It is a flowchart showing.

FIG. 13 is a subroutine (12) in one embodiment of the present invention.
It is a flowchart showing.

FIG. 14 is a block diagram showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Charging device 2 Charging circuit 7 Charging outlet 9 Voltage sensor 10 Battery relay as opening / closing means 11 Control means

Claims (1)

[Claims] 1. A charging circuit, a plurality of charging outlets provided in parallel with the charging circuit and connected to batteries, respectively, and a terminal voltage of a battery provided for each charging outlet and connected to the charging outlet. A plurality of voltage sensors for detecting, a plurality of opening / closing means provided for each of the charging outlets to open / close the connection between each charging outlet and the charging circuit, and a terminal voltage of the battery detected by the voltage sensor. A charging device that controls the opening / closing means on the basis of the control means to charge the battery in order from a battery with a low terminal voltage.