JP2900124B2 - Uninterruptible power system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an uninterruptible power supply capable of attaching and detaching a battery, and more particularly to an uninterruptible power supply capable of monitoring a connection state of a battery.

[0002]

2. Description of the Related Art In recent years, electronic equipment is generally provided with a commercial AC power supply as a power supply, rectifying an AC voltage to convert it into a DC voltage, and using it as a circuit power supply. Some AC power supplies automatically receive power for a circuit power supply from a battery unit and charge the battery unit when necessary. In this type of uninterruptible power supply, there is an uninterruptible power supply capable of monitoring a connection state and a charging state of a battery unit. An uninterruptible power supply of Japanese Patent Application No. 5-226632, which was created by the inventors of the present application and has already been filed separately, is one of them. In the earlier application, while having an A / D converter,
When a plurality of battery parts are connected, the combined resistance of one of the divided resistors is reduced in accordance with the number of the divided battery parts, and a decrease in the divided voltage is derived from an A / D converter. The number of connected battery units and the presence or absence of connection are detected.

[0003]

In the above-mentioned conventional monitoring of the connection state of the battery unit, the voltage of the monitoring battery is changed to A / D.
To obtain a voltage for conversion, it is applied to a voltage dividing resistor and a comparatively large current flows.In addition, since a backup battery voltage is used, it operates even when the AC power supply is turned OFF, that is, when a power failure occurs. Therefore, there is a problem that the backup battery consumes much and various information cannot be stored for a long time.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide an electronic apparatus capable of performing appropriate management such as monitoring of a connection state of a battery unit with low power consumption. And

[0005]

According to the electronic apparatus of the present invention, a circuit unit and a battery unit are formed separately, and the circuit unit and the battery unit are connected via a connector. "ON" / "OF" for determining whether the AC power supply to the circuit section is "ON" or "OFF"
F "discriminating means, first signal output means for outputting a voltage corresponding to the number of connected battery units, and second signal output means for outputting a binary signal according to the presence or absence of connection of the battery unit. , "O" / "OFF"
In the "N" state, there is provided monitoring means for monitoring the connection state of the battery unit based on the signal of the first signal output means, and in the "OFF" state, based on the signal of the second signal output means. I have.

In this uninterruptible power supply, the AC power supply "O"
When "N", the circuit operates with the voltage from the AC power supply,
In addition, in the determination of the "ON" state, a voltage corresponding to the number of battery units is output from the first signal output means, so that the monitoring means can finely discriminate this voltage value to know the number of connected parts. On the other hand, when the AC power supply is turned “OFF”, “OF”
By the determination of “F”, a signal indicating the presence or absence of connection of the battery unit, for example, one of “high” and “low” is output from the second signal output unit, so that the monitoring unit outputs “high” and “low”. ”To detect the presence or absence of a connection,
You can also remember. In this case, it is only necessary to distinguish between “high” and “low”. For example, it is not necessary to supply a large current to the voltage dividing resistor, so that the power consumption is low.

[0007]

The present invention will be described in more detail with reference to the following examples. FIG. 1 is a block diagram showing a configuration of an uninterruptible power supply according to the present invention. This uninterruptible power supply includes a battery unit 10 and a control unit 20.

The battery unit 10 has a built-in chargeable / dischargeable battery (storage battery). Control unit 20
Is an AC plug 21 for connecting to a commercial AC power supply,
A power circuit 22; an output outlet 23; a control circuit 24 for controlling the power circuit 22;
2, a UMCU microcomputer 25 for executing the control processing, a BMCU microcomputer 26 for monitoring such as detecting a connection state of the battery unit 10, an alarm and LED display unit 27, and a power supply in the control unit 10. And a power supply unit 28. The battery unit 10 and the control unit 20 are connected to each other by a cable 11 and a connector 12. The number of lines of the cable 11 and the number of terminals of the connector 12 are provided at least for charging and discharging and for monitoring. The BMCU microcomputer 26
Has an A / D converter for monitoring the voltage of the battery of the battery unit 10 and a backup battery.

In this uninterruptible power supply, usually, AC plugs of some electronic devices are connected to an output outlet 23. When there is no power failure, the AC voltage input from the AC plug 21 is rectified and converted into a DC voltage, and then converted again into an AC voltage by an inverter. Has been supplied.
Further, the battery of the battery unit 10 can be charged via the power circuit 22 and the power supply unit 28. Due to a power outage
When the AC voltage is no longer supplied from the AC plug 21, U
The power circuit 22 is switched by the control circuit 24 under the control of the MCU 25, and the battery unit 10
Is supplied to each electronic device via the battery circuit 22 and the output outlet 23. On this occasion,
The BMCU microcomputer 26 determines whether or not an AC power supply exists (O power supply
N, OFF), the connection state, voltage, usage time, and the like of the battery of the battery unit 10 are continuously monitored.

Next, a monitor of the BMCU microcomputer 26 will be described.
Noh will be described. FIG. 2 shows an uninterruptible power supply according to the embodiment of FIG.
Connection between the BMCU microcomputer of the device and the battery unit
FIG. Battery of battery unit 10
13 is a terminal P of the connector 12_Two, P_ThreeThrough BMC
U microcomputer 26 and the battery unit
10 R₁Is the terminal P of the connector 12₁, P_FourThrough
And connected to the BMCU microcomputer 26. Also, B
Terminal P of connector 12 of MCU 26₁Connected to
The resistance R₁Of the resistor R₁The other end of
Is the voltage V from the power supply unit 28.₁Is given. Ma
The BMCU microcomputer 26 has a backup battery.
29, the voltage V of the battery 29_TwoIs the resistance R _ThreeTo
Terminal P of the connector 12 of the BMCU microcomputer 26₁
Connected to the line connected to.

In the circuit shown in FIG. 2, resistors R ₁ and R ₂
(About 10 kΩ), the resistance value of the resistor R ₃ is set to be large (100 kΩ to ₁ MΩ), and the resistances R ₁ , R
₂ , the voltage V ₁ is divided and the resistors R ₃ and R ₂ divide the voltage V ₂ . Status of the power "ON", that is, if the AC power supply to the control unit 20 is supplied is the voltages V ₁ applied from the power supply unit 28, the divided voltage in this case is resistor R ₁ and R ₂ BMCU microcomputer 2
6, and converts the voltage into a digital value by a built-in A / D converter. In this case, as the number of battery units connected to the control unit 20 is large, the number of parallel connections becomes large resistor R _1, the terminal P _1, the combined resistance value between the P ₄ is reduced, the voltage at the terminal P ₁ is small Become. Therefore, the magnitude of the voltage value taken-in A / D conversion of the terminal P _1, it is possible to know the number of connected battery units.

When the power supply is in the "OFF" state, the voltage V₁Is
I can't. Therefore, when the power is off,
R_Three, R_TwoTerminal P using the divided voltage₁Line is "C
Depending on whether it is "i" or "low".
The presence or absence of connection of the battery unit 10 is detected. Ba
If the battery unit 10 is not connected, the terminal P₁But
In the open state, it is pulled up to “high”. Bag
When the terry unit 10 is connected, the terminal P₁Is resistance
R_ThreeAnd R_TwoVoltage V_TwoAnd the partial pressure of R_Three≫R ₁What
So the terminal P₁Is pulled down to “low”. this
By distinguishing between "high" and "low" and remembering
To detect the connection of the battery unit 10 and record it.
can do.

Now, the power supply to the control unit 20 is "ON".
State, the battery monitor when changing to the "OFF" state
The visual operation is shown in a time chart shown in FIG.
This will be described with reference to a chart. In FIG. 3, the passage of time
From right to left, at time t_ThreeFrom "ON" to "OFF"
FIG. Time t_TwoThen, the terminal P ₁
At the end of the A / D conversion value at
Time t before sampling₁Then the penultimate A / D
The conversion value has been obtained.

At time t ₃ , when the power supply is turned off, that is, the sleep mode is entered, the BMCU microcomputer 26 firstly outputs the A / D converted value before the power supply is turned off and further outputs the signal “OF”.
F ”, that is, the A / D conversion value at time t ₃ is integrated, and 3
, Moving average, and divide the value into “high” and “low”
(Step ST1). At the next sampling time t ₄ , the “high” or “low” value of the terminal P _{1 at} the time t ₄ is multiplied by doubling the “high” and “low” values at the time t ₄ and divided by three. The obtained value is represented by “high” and “low” (step ST2).
Then, is the power of the control unit 20 turned “ON” every time the sampling time comes? Is determined (step ST3), and if it is not ON, "high"
While repeating the moving average of “ ₁ ” and “low”, whether the terminal P ₁ is “high” or “low”, that is, monitoring of the battery unit connection is continued.

At the time of sampling, from "OFF" to "O"
N ", the determination in step ST3 becomes YES, and the processing shifts to power supply" OFF → ON ". Next, a processing operation from the power supply “OFF → ON” in the embodiment apparatus will be described with reference to a time chart shown in FIG. 5 and a flowchart of FIG. The way of illustration in FIG. 5 is the same as that in FIG. At time t _1, t _2, and since a process when "OFF", "high" and "low" terminal P ₁ at each time point
Is obtained and stored. If it changes to “ON” at time t _3, it passes through the discrimination values of “high” and “low” at time t ₃ , and integrates them to obtain a moving average value divided by 3, which is then A / D It is converted into a converted value (step ST22). After the time point t ₄ , the voltage of the terminal P ₁ becomes A /
The connection state of the battery is continuously monitored with the D conversion value.

[0016]

According to the present invention, the "ON" of the AC power supply
Sometimes, a signal voltage according to the number of connected batteries is used to monitor the connection state of the battery.
Since "High" and "Low" are monitored according to the presence / absence of connection, when the power supply is "OFF", low power consumption is sufficient, and the battery for backup can last longer,
Appropriate management of the connection state, duration, etc. can be performed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an uninterruptible power supply in which the present invention is implemented.

FIG. 2 is a circuit diagram for explaining a connection state monitoring function between a battery unit and a control unit of the uninterruptible power supply.

FIG. 3 shows “ON” to “OFF” in the apparatus of the embodiment.
6 is a time chart for explaining an operation at the time of change to.

FIG. 4 shows “ON” to “OFF” in the apparatus of the embodiment.
9 is a flowchart for explaining the operation when the state changes to.

FIG. 5 is “OFF” to “ON” in the apparatus of the embodiment.
6 is a time chart for explaining an operation at the time of change to.

FIG. 6 is a diagram illustrating an apparatus according to the embodiment from “OFF” to “ON”.
9 is a flowchart for explaining the operation when the state changes to.

[Explanation of symbols]

10 battery unit 12 connector 20 control unit 26 BMCU microcomputer P _1, ..., P ₄ connector terminal R _1, R _2, R ₃ dividing resistor

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H02J 9/00-11/00 H02J 7/00-7/35

Claims (2)

(57) [Claims] 1. An uninterruptible power supply in which a circuit section and a battery section are formed separately and the circuit section and the battery section are connected via a connector, wherein an AC power supply to the circuit section is "ON". "ON" / "OFF" determining means for determining "OFF"; first signal output means for outputting a voltage corresponding to the number of connected battery units; A second signal output means for outputting a value signal;
In the "ON" state by the "FF" determination means, the connection state of the battery unit is monitored based on the signal of the first signal output means, and in the "OFF" state, based on the signal of the second signal output means. An uninterruptible power supply device comprising: 2. From "ON" to "OFF" or "O"
At the time of switching from “FF” to “ON”, of the output of the first signal output means and the output of the second signal output means, the previously monitored signal output is converted into the subsequent signal output, 2. The uninterruptible power supply according to claim 1, wherein the connection state of the battery unit is monitored with the output signal after the moving average.