JPS5948662A - Apparatus for testing charge and discharge - Google Patents

Abstract

PURPOSE:To miniaturize the titled apparatus and to eliminate a mechanical operation part while high reliability is achieved, by a method wherein a discharge circuit and a charge circuit are connected in parallel with the output of a battery and the charge circuit is constituted by a current control element to perform the increasing and decreasing control and the ON-OFF of charge and discharge currents. CONSTITUTION:The discharge test of a test battery 2 is performed by flowing a discharge current to a discharging load 6 and, when a transistor 61 is used as the load and a control signal is applied to a base 61a from the discharge current control output terminal 5g of a control circuit 5 while the transistor 61 is turned on, a current is flowed between a collector 61b and an emitter 61c. The voltage between the collector and the emitter can be changed between 0.2- several volts by a base current. Therefore, the discharge current of the battery can be controlled by the base current and a cut-off state can be obtained by cutting off the base current.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a charge/discharge test device for testing charge/discharge of a secondary battery.

Secondary batteries such as lead-acid batteries are constantly charged and maintained to maintain a predetermined capacity in order to prevent capacity reduction due to self-discharge. However, in actual storage batteries, the battery capacity decreases due to aging due to repeated charging/discharging cycles and long-term use, and there is a risk that the battery will not be able to supply necessary power during extraordinary times such as power outages. To prevent this, we periodically conduct discharge tests on storage batteries to check the battery capacity in order to understand the state of deterioration of the storage battery, and if there is a significant decrease in capacity, we take measures such as replacing it.

Figure 1 is a circuit diagram of a conventional charging/discharging test device for conducting the test, where 1 is a commercial power supply, 2 is a test battery, 3 is a charger, 4 is a discharging load, 5 is a control circuit, and 31 is a charging A start/stop switch 41 is a switch for starting/stopping discharge. The output voltage of the test battery 2 is input to the battery voltage detection input terminal 5a of the control circuit 5, and from this control circuit 5, a control output from the charging current/voltage control output terminal 5b is sent to the charger 3. The control output from the discharge current control output terminal 5c is output to the discharge load 4, and the drive output from one switch drive output terminal 5d is output to the charge start/stop switch 31. , the drive output from the other switch drive output terminal 5e is output to the switch 41 for starting and stopping discharge.

In this charge/discharge test device, when performing a discharge test on the battery 2, a drive signal from the drive output terminal 5e of the control circuit 5 is applied to the switch 41, and the switch 41 is turned on.
This is done by passing the current from the battery 2 through the discharge load 4. The discharge current at this time is determined by applying a control signal from the discharge current control terminal 5C of the control circuit 5 to the discharge load 4, thereby changing the value of the internal resistance of the discharge load 4 and making it a specified current. . In the control circuit 5, the battery voltage from the battery 2 is constantly received at the battery voltage detection input terminal 5a, and when the battery voltage reaches the discharge end voltage, the switch 41 is activated at the drive output terminal 5e.
It is turned off by the drive signal from and stops the discharge test.

To recover and charge the battery 2 after completing the test, a drive signal from the drive output terminal 5d of the control circuit 5 is applied to the switch 31, the switch 31 is turned on, and current is supplied from the charger 3 to the battery 2. Charge the battery.

The charging current and voltage at this time are the charging voltage and voltage of the control circuit 5.
It is controlled by a control signal from the current control output terminal 5b. When charging is completed, the switch 31 is turned off by a drive signal from the drive output terminal 5b to stop the charging.

This charge/discharge test device uses electromagnetic switches as the switches 31 and 41, and is turned on and off by a drive signal from the control circuit 5.
Since it can be turned off, operation of the test equipment is simplified compared to the previous manual on/off switch.

However, this charge/discharge test device does not pose a problem when the capacity of the battery being tested is small because the charging and discharging currents themselves are small, but when it comes to the charging and discharging currents of communication batteries, However, when the current is around 100A to 100OA, in order to use this device for that battery, the electromagnetic switch becomes extremely large, more expensive than the charger or discharge load, and requires a mechanical switch.・Because it is an inch, the contacts wear out and have the disadvantage of lacking reliability.

It is also possible to use a semiconductor switch using Cyrisk etc. instead of an electromagnetic switch, but the forward voltage drop of these semiconductors is generally 1.4V or more,
Since the end-of-discharge voltage of a single test battery is about 1.8 to 1.6 V, sufficient discharge cannot be achieved due to the voltage drop of the semiconductor switch, so the semiconductor switch is not suitable for use.

The present invention has been made in view of the above, and its purpose is to use a current control element to control discharging and charging, and to use the control element also as a switch for starting and stopping discharging and charging. Therefore, it is an object of the present invention to provide a charge/discharge test device that solves the above-mentioned problems.

Examples of the present invention will be described below. FIG. 2 shows one embodiment, and the same parts as in FIG. 1 are given the same reference numerals. Reference numeral 6 denotes a discharging load that constitutes a discharging circuit, and 7 a charger that constitutes a charging circuit.These are controlled by control signals from the discharging current control output terminal 5g and the charging voltage/current control output terminal 5f of the control circuit 5. It is designed to be turned on/off and controlled.

The discharge load 6 includes a transistor 61 as shown in FIG.
The base 61a of the transistor 61 is connected to the discharge current control output terminal 5g of the control circuit 5, the collector 61b is connected to the positive electrode 2a of the test battery 2, and the emitter 61c is connected to the negative electrode 2b of the test battery 2. has been done.

- As shown in FIG. 4, the photoelectric device 7 is composed of a switching regulator 71 that inputs AC from the commercial power supply 1 and obtains a DC output, and a transistor 72 as a series regulator that controls the DC output. Input terminals 71a, 71b of switching regulator 71
is connected to the commercial power supply 1, the positive output terminal 71C is connected to the collector 72a of the transistor 72, and the negative output terminal 71d is connected to the negative electrode 2b of the test battery 2.

The emitter 7'2b of the transistor 72 is connected to the positive electrode 2a of the test battery 2, and the base 72C is connected to the charging voltage/current control output terminal 5f of the control circuit 5.

In the case of the discharge test of the test battery 2, the test is performed by flowing the discharge current from the test battery 2 to the discharge load 6.
is used, a control signal is applied from the discharge current control output terminal 5g of the control circuit 5 to the base 61a of the transistor 61, and when the transistor 61 is turned on, a signal is generated from the test battery 2 between the collector 61b and the emitter 61C. Current flows, and the area between the collector and emitter is used as a load. The collector-emitter voltage of this transistor 61 can be varied between about 0.2 and several volts depending on the base current.

Therefore, the discharge current from test battery 2 is
By canting the base current, the collector-emitter of the transistor 61 can be cut off. In other words, the discharge current from the test battery 2 can be controlled by increasing or decreasing the base current, and the transistor 61 can be turned on or off by turning on or off the base current. At the same time, it can also serve as a switch for starting and stopping discharge.

Therefore, in the discharge test of the test battery 2, the discharge current control output terminal 5 of the control circuit 5 is operated until the battery voltage reaches the final discharge voltage.
The value of the discharge load 6 is controlled by the control signal from g,
When the control circuit 5 detects the discharge end voltage of the battery voltage, it stops outputting the control signal, turns off the discharge load 6, and disconnects it from the test battery 2.

On the other hand, for recovery charging of the test battery 2 after the discharge test, the transistor 72 as a series regulator is turned on by a control signal from the charging voltage/current control output terminal 5f of the control circuit 5, and then the control signal is By increasing or decreasing the resistance value between the collector and emitter of the transistor 72, the current required for charging is controlled. Note that the switching regulator 71 outputs a constant DC voltage necessary for charging. When charging is completed, the control circuit 5
The transistor 72 is cut off by cutting the control signal from the charging voltage/current control output terminal 5f.

That is, this transistor 72 also controls the charging voltage and current, and also serves as a switch for starting and stopping charging.

As described above, the charge/discharge test device of the present invention includes a discharging circuit and a charging circuit that are connected in parallel to the output of a storage battery, and a control circuit that inputs the output of the storage battery and controls the charging circuit and the discharging circuit. The charging circuit and the discharging circuit each include a current control element, and the current control element controls the increase and decrease of the charging current and the discharging current, and turns them on and off.

Therefore, the current control elements of the charging circuit and discharging circuit control charging and discharging, as well as start and stop them, eliminating the need for mechanical switches, making the device more compact and
There are advantages in that it is possible to achieve economicalization and also to achieve high reliability because there are no mechanically moving parts.

[Brief explanation of the drawing]

Figure 1 is a circuit block diagram of a conventional charge/discharge test device, Figure 2
The figure is a circuit block diagram of one embodiment of the charging/discharging test device of the present invention, FIG. 3 is a specific circuit diagram of the discharging load in FIG. 2, and FIG. 4 is a specific circuit diagram of the charger in FIG. 2. It is. DESCRIPTION OF SYMBOLS 1... Commercial power supply, 2... Test battery, 3... Charger, 4... Discharge load, 5... Control circuit, 6... Discharge load, 7... Charger , 61...transistor,
71...Switching regulator, 72...Transistor. Patent applicant: Nippon Telegraph and Telephone Public Corporation 0

Claims (1)

[Claims] (1) It consists of a discharging circuit and a charging circuit connected in parallel to the output of the storage battery, and a control circuit that inputs the output of the storage battery and controls the charging circuit and the discharging circuit, the charging circuit and the discharging circuit. A charging/discharging test device characterized in that each circuit is constituted by a current control element, and the current control element controls the increase/decrease of charging current and discharging current and turns them on/off.