JPS604134Y2 - Storage battery capacity testing device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a capacity testing device used to test the capacity of storage batteries (hereinafter simply referred to as batteries) in communications facilities where maintenance is important, such as telephone stations and wireless relay stations. .

Generally, in public telephones, etc., in order to eliminate problems caused by power outages, a large number of batteries are used while being floatingly charged using commercial power.However, in the unlikely event that a commercial power outage occurs, the batteries must be used to supply power to the load solely from the batteries. It is necessary to know at all times how much power the battery can supply to the load when the battery runs out, and for this reason, battery capacity tests are often performed.

Capacity testing is performed by supplying power to the load only from batteries that have stopped floating charge, and measuring the voltage of each individual battery, the load terminal voltage (voltage supplied by many batteries in series or series-parallel), or the load. The discharge current to the battery can be recorded over time to be used as a reference for determining the battery's capacity, etc., and floating charging can be started without delay when the battery's end-of-discharge voltage is reached or the load terminal voltage reaches the lower limit. This must be done to prevent battery deterioration.

For these tasks, such as reading the voltage, measuring the battery, or starting floating charging, etc., requires extreme caution.Especially when starting floating charging, it is difficult to know when the load voltage will reach the allowable lower limit, so personnel must be on hand at all times. Therefore, during the capacity test, no other work can be performed.

In view of the above, this idea was made to almost automate the battery capacity test.
Alternatively, it is possible to not only periodically print out the current supplied to the load, but also automatically issue an alarm when the battery reaches its end-of-discharge voltage or when the voltage supplied to the load reaches an allowable value. , which connects an AC power source to the charging device for floating charging, has the advantage of being able to perform detailed capacity tests accurately without requiring any input, and safely without deteriorating the battery. The present invention provides a capacity testing device having the following features.

Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 1 is a system diagram of an apparatus according to an embodiment of the present invention.

Reference numeral 1 denotes a constant voltage rectifier as a floating charging device, and the input of AC power is turned on and off by a switch SW.

Note that the switch SW is an electromagnetic switch that is supplied with current through a path to be described later and is electromagnetically connected.

2 is a battery group whose capacity is to be tested, 3 is a load device to which power is supplied by the battery group, and the output terminal of each battery is indicated by A in the figure.
□, A2... 荊, and the number of batteries n is selected depending on the required supply voltage to the load.

After the voltage from the output terminal (i is a natural number) is applied to the input distributor 4, it is rotated and selected electronically or mechanically and guided to the voltage detection circuit 5.

This voltage detection circuit 5 is configured as described later mainly using a differential amplifier, and has a final discharge voltage of 1.8V for each battery.
It is detected that the terminal voltage has reached (assuming a lead-acid battery), the relay 6 is driven based on that information, and the contact point is used to issue an alarm by the lamp or buzzer of the alarm circuit 7.

At the same time, the excitation winding of the electromagnetic switch SW is driven to turn on the switch, and the constant voltage rectifier 1 is connected to the AC power source AC.
battery group 2 is float-charged.

It should be noted that it would be easy in terms of design to turn off the switch SW when the winding is excited.

Reference numeral 8 denotes a calibration power source for accurately setting the detection voltage of the voltage detection circuit 5, which is comprised of a voltmeter, a voltage bleeder, or the like.

9 is a display unit to which a part of the output of the input divider 4 is applied, and the voltage is sequentially switched and displayed digitally as the input divider 4 switches, but its operation is similar to a general digital voltmeter. be.

Reference numeral 10 denotes a printing machine that prints a display voltage by passing a portion of the digital display signal from the display section 9.

Reference numeral 11 denotes a current shunt for extracting current consumption information, which shunts a part of the current consumed by the load device 3 and adds it to the discharge current integrator 12, where the power consumed by the load is calculated and displayed on a digital display. (Illustrations omitted) and
The results are printed by the printing machine 13.

The operation of the device of the present invention has been explained above, and the distribution timing of the input distributor 4 and the integration timing of the discharge current integrator 12 are automatically driven at fixed time intervals by a drive device (not shown), and display or printing is performed. In addition, in the above, only the battery terminal voltage is displayed or printed to issue an alarm, but it is natural that the load supply voltage of the battery group can be similarly distributed and printed, alarmed, etc. , the voltage detection circuit 5, etc., detects the minimum allowable load supply voltage,
That is, it goes without saying that it is necessary to provide something equivalent to the load tolerance value.

Since the present invention is as described above, when performing a capacity test, if the switch SW is turned off and power is supplied only from the battery to the load, the battery side or load supply voltage will be displayed at the set time interval. or is printed, or when the battery reaches the end of discharge voltage or when battery group 2 reaches the discharge allowable value, an alarm is issued, and the switch SW
is turned on to floatingly charge battery group 2 to prevent battery deterioration and secure the load supply voltage.At the same time, from the printed discharge power result, the load power supply time only by battery group 2 is known, and therefore the battery You can know the abilities of group 2.

Figure 2 shows the voltage detection circuit 5 to explain the details of voltage detection.
1 and its peripheral circuits, and the case of terminal voltage detection will be described below.

The voltage from the input divider 4 is applied to a differential amplifier 13 whose comparison voltage is set to the end-of-discharge voltage of one battery, 1.8V, and when the voltage drops beyond the set value, the amplified signal is The relay 6 is driven through the Schmitt circuit 14 to operate the switch SW and the alarm circuit 7 (FIG. 1).

Note that the comparison voltage is calibrated by a calibration power source 8.

FIG. 3 is a diagram for explaining the discharge current integrator 12, and 15 indicates a sampling circuit, which samples a current proportional to the discharge current applied from the shunt 11 (FIG. 1) at regular intervals, and obtains an analog quantity. The converter 16 that converts into the number of pulses converts each current class into the number of pulses, and the counting circuit 17 calculates the time by dividing the number by the number of samplings per hour, and calculates the time between that and the current. The amount of discharge is determined from the product, and this is displayed or printed on the display 18 or the printer 10'.

Note that it is obvious that the accuracy of discharge amount calculation is proportional to the sampling frequency.

As is clear from the detailed explanation above, the present invention is a device that enables unattended battery capacity testing, which not only saves labor but also greatly improves accuracy. By implementing this method in computer facilities, etc., it is possible to easily maintain reliable power supply maintenance.

[Brief explanation of drawings]

Figure 1 is an explanatory system diagram of one embodiment of the present invention, Figures 2 and 3
The figure is a detailed configuration diagram of the main parts of the present invention. 1... Constant voltage rectifier, 2... Battery group, 3... Load device, 4... Input distributor, 5... Voltage detection circuit, 6... Relay, 7... Alarm circuit, Death... Calibration power supply,
9...Display section, 10...Printing machine, 11
...... Shunt machine, 12 ... Discharge current integrator, 13 ... Differential amplifier, 14 ... Schmitt circuit, 15 ... Sampling circuit, 16
......Converter, 17...Counting circuit, 18
······Display machine.

Claims (1)

[Scope of utility model registration request] At least one of each battery terminal voltage of the storage battery group or the load supply voltage supplied by the storage battery group is applied to a voltage detection circuit set to the end-of-discharge voltage or load permissible voltage of a single battery, and the set voltage is detected. A device configured to start floating charging of a storage battery group and issue an alarm based on the result; a device configured to time-divisionally display and automatically record the value of the terminal voltage or load supply voltage of each battery; and 1. A storage battery capacity testing device comprising: a device for counting discharge current from a group of storage batteries to a load, and displaying and recording the value.