JPH087792Y2 - Charger - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a charging device for rectifying AC power to charge a storage battery, and particularly, to display the time until the charging is completed or the charging completion time. It is what

"Prior Art" Japanese Patent Laid-Open No. 59-169550 discloses that, in order to display the state of charge in a conventional charging device, the voltage of a storage battery is detected and the indicator lights corresponding to the detection are sequentially turned on. There is. In this case, many voltage detection circuits are required to detect the voltage of each state of the storage battery, and the structure is complicated accordingly. Further, it cannot always be said that the state of charge is well displayed, and it is particularly difficult to predict when the charge will end and how much later it will end. Also, Japanese Utility Model Laid-Open No. 59-163637 discloses that when the voltage of the storage battery reaches the voltage at the inflection point in the charging characteristic, it is displayed that charging is completed to some extent. In this case, the display of the state of charge is very rough, and it is impossible to predict the end time or the time until the end.

However, in order to effectively use the storage battery-equipped device, it is convenient to know when the storage battery is charged and how long it will be completed. Is.

The purpose of this invention is to predict and display the charging completion time or the time until the charging is completed, even when the performance of the storage battery is different, or when the charging characteristics of the storage battery are different due to changes in the charging characteristics due to aging and ambient temperature changes. It is to provide a charging device that can perform.

[Means for Solving Problems] According to the present invention, the voltage of the storage battery is detected by the voltage detecting means, the elapsed time from the start of charging is measured by the time measuring means, and the measured elapsed time is the first set elapsed time. When the time comes, the first charge completion time detecting means obtains the time until completion of charging from the function of the difference between the detected storage battery voltage at that time and the storage battery voltage V ₁ at the start of charging, and the first charge completion time detecting means. Before the storage battery reaches the inflection point voltage after the charge completion time is detected, every time the storage battery voltage becomes a plurality of set voltages or the measured elapsed time becomes a plurality of set elapsed times, this is the timing. Each time the timing is detected by the detection means and the timing detection means detects the voltage of the storage battery and the voltage at that time.
The time from the product of the function of the difference from V ₁ and the function of the elapsed time at that time to the completion of charging is obtained by the second charging completion time detecting means, and until the completion of charging obtained by the second charging completion time detecting means. The time until completion of charging or the time of completion of charging is displayed on the display means by using the time.

As described above, according to the present invention, it is convenient to display the time until the charging is completed or the charging completion time before the storage battery voltage reaches the inflection point voltage, and it is convenient to set the voltage or the voltage set during charging. Since the time until completion of charging is predicted every time the elapsed time elapses, a more accurate completion time or completion time is obtained as the completion of charging is approached, and the completion time or completion time is corrected and displayed.

"Embodiment" FIG. 1 shows an embodiment of the charging device according to the present invention. The output of an AC power supply 11 such as a commercial power supply is supplied to a magnetic contactor contact 13 through an input terminal 12 of a charging device and a transformer 15 through an overcurrent detection thermal relay contact 14. Transformer
Reference numeral 15 is a leakage transformer having a leakage magnetic path, which has a current drooping characteristic. The AC power converted into a predetermined voltage by the transformer 15 is full-wave rectified by the rectifier 16, and the charging device is passed through the fuse 18.
It is supplied to the storage battery 21 to be charged through the output terminal 19 of 11.

A charging control device 22 is provided, and the rectifier 16 and the fuse 18 are provided.
The input terminal 23 of the charging control device 22 is connected to the connection point of.
A power supply circuit 24 is connected to the input terminal 23, and the power supply circuit 24 inputs DC power from the storage battery 21 and supplies necessary operating power supply power to each unit in the charging control device 22.

In this invention, a voltage detection circuit 25 is provided at the input terminal 23. The voltage detection circuit detects the voltage of the storage battery 21 as a digital value, and what is detected as an analog voltage may be changed to a digital voltage by the AD converter.
Alternatively, a so-called digital voltmeter may be used. In any case, the voltage _{Vb of the} storage battery 21 is detected as a digital value, and the detected value is supplied to the control unit 26 including a microcomputer.

The input terminal 12 is provided with an AC detection circuit 27.
The input terminal 12 is connected to the AC power supply 11 to detect that AC power is input and notify the control unit 26, or when the input of AC power is stopped due to a power failure or the like, this is AC.
It is detected by the detection circuit 27 and notified to the control unit 26.

The control unit 26 has a normal charging switch 28 and a uniform charging switch.
29 is connected and the switch 28 is turned on, the control unit 26
Performs so-called normal charge control, that is, performs charge control for storage battery 21 according to a predetermined program while detecting the voltage of storage battery 21. When the equalization charge switch 29 is turned on, the control unit 26 charges the cells of the storage battery 21 for a certain period of time, for example, for another 2 hours even after the normal charging has been completed in order to charge the cells evenly. The control is performed to uniformly charge each cell.

A clock circuit 31 is further connected to the control unit 26, and the current time is input to the control unit 26 as a digital value. The control unit 26 can control the SSR relay 33 through the drive circuit 32, and can control the current to the electromagnetic contactor coil 34 by this relay to turn on and off the contact 13. Further, display elements L _{1 to} L ₆ such as LEDs indicating a charge state are provided, and these are lit and displayed by the control unit 26 through the drive circuit 32. Further, the drive circuit 32 is provided with a numerical value display section 35, and the display section 35 displays the charging end time or the time until the charging end. The display is switched by the switch 36 connected to the control unit.

The display elements L _{1 to} L ₆ are arranged on a line, for example, as shown in FIG. 2, and in this example, the display elements L _{1 to} L ₆ are arranged on a line substantially matched with the shape of the charging characteristic curve. In addition, a display unit for the numerical display unit 35 is provided on this panel surface.

Next, the operation of the control unit 26 will be described with reference to the flowchart of FIG. 3 and the charging characteristic diagram of FIG. When the AC power supply 11 is connected to the input terminal 12 and one of the switches 28 and 29, for example, 28 is turned on, charging is started. Control unit 26 turns on SSR relay 33
This turns on the contactor 13 of the electromagnetic contactor and turns on the storage battery.
Charging to 21 is started, and the display element L ₁ is turned on (step S ₁ ). Next, the display switching flag F is set to 0 (step S ₂ ), the operation of the subtraction timer is stopped, and its value t _D is set to 0 (step S ₃ ), while the addition timer starts the addition operation from 0. The elapsed time from the start of charging
t _up will be obtained by the addition timer (step
S ₄ ). Further measured voltage V _b of the storage battery 21 by the voltage detection circuit 25, give the measured voltage V _1, which is stored in a register or memory (step S _5).

It is checked whether the value t _{up of the} addition timer reaches the set time T ₀ (step S ₆ ), and when t _up reaches the set time T ₀ , the storage battery voltage V _b at that time is measured to obtain the measured voltage V ₂ ( step S _7). The difference V _A between this voltage V ₂ and the initial voltage V ₁ is calculated (step S ₈ ), and the charging completion time is calculated from this V _A to a function f created in advance from experiments such as the rising characteristics of the charging voltage V _b. This is calculated by substituting, and this charging completion time f (V _A ) is set to the value t _D of the subtraction timer and the subtraction timer is operated, and the time t _D decreases as time elapses (step S ₉ ). Detected charging completion time f a (V _A) is added to the current time t _p of the clock circuit 36 calculates a charging completion time T _F (step S _10).

Then running the display subroutine displays the charging completion time or charge completion time (step S _11). Battery voltage V _b
Has been set to the set voltage V ₃ (step S ₁₂ ), and the display subroutine is executed until the set voltage V ₃ is reached. V _b is
When reaching V ₃ , the indicator lamp L ₂ is turned on, and the difference V _B between the voltage V ₃ and the initial voltage V ₁ is calculated (step S ₁₃ ). The charging completion time f (V _B ) × g (t _up ) is calculated from this difference voltage V _B and the elapsed time t _up until then by a predetermined function, and this is set in the subtraction timer (step S _14). ). The charging completion time f (V _B ) × g (t _up ) is added to the current time t _p to obtain the charging completion time T _F (step S ₁₅ ).

Then while executing the display subroutine (step S
₁₆ ), it is checked whether the storage battery voltage V _b has reached the set voltage V ₄ (step S ₁₇ ). When V _b is V _4, the indicator lamp L ₃ is turned, also V ₄ -V ₁ = V _c is calculated (step S _18).
The charging completion time f (V _c ) × g (t _up ) is obtained from the V _c and the elapsed time t _up obtained by the addition timer (step S ₁₉ ), and the time f (V _c ) × g (T _up ) the current time
The charging end time T _F is calculated by adding it to t _p (step S
₂₀ ).

Based on the detected charging completion time or time, the display subroutine is executed to display the charging completion time t _D or the charging completion time T _F (step S ₂₁ ). Battery voltage V _b
Is checked to see if it has reached the set voltage V ₅ (step S ₂₂ ). V _b
= When becomes V _5, indicator L ₄ is turned, V ₅ -V ₁ = V _D is calculated (step S _23). The charging completion time f (V _D ) × g (t _up ) is calculated from this V _D and the elapsed time t _up, and that time is set in the subtraction timer (step S ₂₄ ). Further, the time f (V _D ) × g (t _up ) and the current time t _p are added to obtain the charging completion time T _F (step S ₂₅ ). Furthermore f
Add the current time t _p to (V _D ) × g (t _up ) × 0.5
The time T _{H at} which L ₅ is turned on is calculated (step S ₂₆ ).

Either of the obtained charging completion time and charging completion time is displayed by executing the display subroutine (step
S _27).

During this display, it is checked whether the current time t _p has reached T _H (step S ₂₈ ). When t _p = T _H , the indicator light L ₅ is turned on (step S ₂₉ ). Subsequently displayed subroutine executed (step S _30), also the current time t _p
It is checked whether or not the charging completion time T _F obtained in step S ₂₅ has arrived (step S ₃₁ ). When t _p = T _F , the indicator light L ₆
Is displayed to indicate that charging is completed, and the SSR relay 33 is turned off. Therefore, the current contactor contact 13 is turned off, and the charging of the storage battery 21 is completed (step
S ₃₂ ). Further, in this example, "UP" is displayed on the display unit 35 to indicate the completion of charging (step _S33 ).

Step S _11, the display subroutine _{S 16, S 21, S 27} , S 30 , as shown in FIG. 5 for example, first, whether the flag F is 0 is checked (step S _30), the F = 0 In this case, the charge completion time T _F is displayed on the display unit 35 (step
S ₃₅ ), if F ≠ 0, the subtraction timer value t ₀ , that is, the time until the completion of charging is displayed on the display unit 35 (step
_S36 ).

In the operation shown in FIG. 3, since the flag F is set to 0 in step S ₂ , the charging completion time T _F is displayed on the display unit 35.
When it is desired to display the time t _D until completion of charging, the switch 36 in FIG. 1 may be turned on. When the switch 36 is turned on, the interrupt routine shown in FIG. 6 operates. That is, it is checked whether the switch 36 is turned on (step S ₃₇ ), and when the switch 36 is turned on, it is checked whether the flag F is 0 (step S ₃₈ ). If F = 0, the flag F is set to 1 (step S ₃₈ ). step S _40), thus the value t _D of the subtraction timer executes a display subroutine, that is, the charging completion time is displayed on the display unit 35. If F = 0 is not set in step _S39 , the flag F is set to 0 (step _S41 ). That is, every time the switch 36 is turned on, the flag F is alternately switched between 0 and 1.
Switching between the charging completion time display and the charging completion time display is performed.

In order to obtain the charge completion time, each value of each f × g may be stored so that the memory can be read by using the difference voltage V and the elapsed time t _up as addresses. Similarly, f (V _A ) in step S ₉ can be obtained. As the elapsed time, not the elapsed time from the start of charging but the elapsed time from the set voltage to the next set voltage may be used.
Alternatively, the time from the start of charging may be set, and the storage battery voltage may be measured every time the set time is reached to similarly obtain the charging completion time. When the elapsed time T ₃ until the storage battery voltage V _b becomes the inflection point voltage (V _{5 in} FIG. 4) on the charging characteristic curve is detected, the time from that point until completion of charging is obtained as a function of T _3. be able to. Therefore, steps S ₂₄ , S ₂₅ , S
Instead of ₂₆ , the charging completion time, the charging completion time, and the time to turn on the indicator light L ₅ in this example may be obtained from T ₃ .

[Advantage of Device] As described above, according to the battery charger of the present invention, the time until completion of charging or the time of completion of charging is displayed, which makes it possible to predict the usage of the device in which the storage battery being charged is used, which is convenient. Is. In addition, since the prediction is repeated during charging, the set voltage and , In order to obtain the required charging time from the elapsed time until the charging voltage of the storage battery reaches the set voltage, it is possible to obtain the accurate required charging time for each storage battery that is always charged,
Moreover, since the prediction is repeated again for each set voltage during charging, a more accurate predicted value is displayed as the charging is completed, that is, as the charging inflection point is approached.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a charging device according to the present invention, FIG. 2 is a diagram showing an example of its panel, FIG. 3 is a flow chart showing an operation example of this charging device, FIG. 4 is a charging characteristic diagram, FIG. 5 is a flow chart showing an example of the display routine in FIG.
The figure is a flow chart showing an example of the operation of switching the display.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Nobuhiro Haneda, 1-18 Hongo-cho, Gifu-shi, Gifu Prefecture (72) Motoki Okada 1673-12 Kamisuwa, Masamasa-cho, Motosu-gun, Gifu (56) References JP-A-60 -255025 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. A charging device for rectifying AC power to charge a storage battery, voltage detection means for detecting the voltage of the storage battery, time measuring means for measuring the elapsed time from the start of charging, and the measured elapsed time. When the first set elapsed time is reached, a first charge completion time detecting means for obtaining a time until completion of charging from a function of a difference between the detected storage battery voltage at that time and the storage battery voltage V ₁ at the start of charging, and the first charging After the completion time detection means detects the charging completion time and before the storage battery voltage reaches the inflection point voltage, the storage battery voltage is detected each time it reaches a plurality of set voltages, or the measurement elapsed time is set to a plurality of settings. Timing detection means for detecting this at each elapsed time, and a function of the difference between the storage battery voltage and the voltage V ₁ at that time each time the timing detection means detects it, and the progress at that time. Second charge completion time detecting means for obtaining a time to charge completion from a product of a function of time, and time to charge completion or charge completion using the time to charge completion calculated by the second charge completion time detecting means. A charging device comprising: a display unit for displaying the time.