JPS5829337A - Dc power source - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a DC power source that receives commercial power, rectifies it with a rectifier, supplies it to a load, and uses the output of the rectifier to float charge an assembled battery as a preliminary energy source. The present invention relates to equal charging of the assembled battery in the device.

Generally, when the commercial power supply is normal, a communication power supply device obtains necessary DC power by rectifying the commercial power supply and supplies it to the load. In addition, a storage battery is provided as a backup power source in order to continue supplying power to the load even in the event of a commercial power outage.

Fig. 1 is a block diagram showing the system configuration of a general power supply device. In the figure, l is a commercial power source, 2 is a rectifier that converts AC to DC, and 3 is a plurality of storage batteries connected in series. 4 is a load.

In operation of this system, when the commercial power supply is normal, AC power from the commercial power supply 1 is converted to DC voltage necessary for the load by the rectifier 2, and power is supplied to the load 4. At this time,
The rectifier 2 also supplies a maintenance charging current to the battery pack 3 to compensate for self-discharge, and generally the voltage is set at a constant voltage of 2.15V to 2.18V per storage battery, which corresponds to the number of batteries. I am charging it all at once. Further, the number of storage batteries is appropriately selected to match the load voltage, and the storage battery capacity is determined from the required load current and the holding time in the event of a power outage.

Therefore, during a power outage, the storage battery supplies the necessary power to the load.

However, in actual assembled batteries, due to differences in characteristics such as self-discharge of individual storage batteries, even when maintenance charging is performed, the individual battery capacity varies greatly, and there is a risk that the required energy will not be supplied in the event of a power outage. Therefore, we periodically perform equal charging on assembled batteries to increase the charging voltage and supply a large amount of charging current to about 2.26V to 2-40V per battery. At the same time, the characteristics of the individual storage batteries that make up the assembled battery are made uniform. Variations in storage battery characteristics are caused by variations in the indicator voltage and electrolyte specific gravity of individual storage batteries, so maintenance personnel must constantly measure the voltage, specific gravity, etc. of each individual battery to eliminate these variations. Either the maintainer decides the timing of the implementation based on the level of success, or the system is implemented periodically at a certain period, regardless of the level of luck promised. However, the former method requires complicated work, while the latter method lacks accuracy in timing and cannot sufficiently uniformize the characteristics of each storage battery.

In order to eliminate these drawbacks, the present invention automatically measures the characteristics of individual batteries, processes the measured data, quantitatively understands the battery characteristics, and calculates equal charging from the results. This can be carried out automatically, and the drawings will be explained in detail below.

FIG. 2 is a block diagram showing one embodiment of the present invention, and the same symbols in this figure as in FIG. 1 refer to the same things. The individual storage batteries constituting the assembled battery 3 are respectively 31, 32, ... 3n (where n is an arbitrary integer), 5 is a data recording device, and 51, 5
2,...5n are terminals connected to a data recording sensor (not shown), 6 is a controller with an arithmetic processing function, 61 is an equal charge drive signal terminal, 21 is a control circuit for the rectifier 2, 201 is an input signal terminal for equal charging input. The wiring in this embodiment is for each battery 31 of the assembled battery 3.
, 32, . . . 3n, the sensor terminals 51, 52, .
・Connect 5n and connect data recording device 5 and controller 6.
are connected by signal lines, and an equal charging drive signal from the controller 6 is connected to the equal charging input signal terminal 201 of the control circuit 21 of the rectifier 2 via the drive signal terminal 61.

To operate this, each storage battery 31°32 of the assembled battery 3 must be
, . . 3nK The terminal voltage of each storage battery is periodically recorded by the data recording device 5 from a data recording sensor (not shown) connected through the K terminals 51, 52, . The data recording device 15 sends the obtained terminal voltage of each storage battery to the controller 6 via the signal line.

The controller 6 processes the data of each storage battery, calculates the standard deviation of the battery pack, checks the variation in the terminal voltage of the storage batteries in the battery pack, and determines if the deviation is larger than a preset deviation value. When the control circuit 2 of the rectifier 2 is connected via the equal charge drive signal terminal 61 of the controller 6,
An equal charge start signal is sent to the equal charge input input signal terminal 201 of No. 1.

In general, the rectifier 2 has an input terminal for floating charge input and an input terminal for equal charge input. Alternatively, it has both functions so that floating or equal charging can be performed by receiving an external electric drive signal and directly operating a relay or the like. Therefore, the rectifier 2 starts equal charging after 5K as described above.

Note that the deviation value set by the controller 6 is generally ±2 when the dispersion of the assembled battery is 2.15V.
%, the set deviation value is set to about 0.04V.

Although the terminal voltage of the battery was measured here as data monitoring for each storage battery, it is also possible to measure the specific gravity of the electrolyte of the storage battery and determine when to perform uniform charging from the standard deviation of the specific gravity of the electrolyte. In addition, in this embodiment, data recording sensors are installed on all the individual batteries in the assembled battery, but some of the batteries in the assembled battery may be designated as pilot batteries, so that similar characteristics can be obtained from the pilot batteries. It is also possible to implement the following.

As explained above, by implementing the present invention, there is no need for a maintenance person to constantly monitor the storage battery, and the equal charging timing, which used to depend on experience, can be accurately and automatically performed. It can be said that the present invention has significant advantages in terms of device maintainability, reliability, and battery life.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the system configuration of a general communication power supply device, and FIG. 2 is a block diagram showing an embodiment of the present invention. Code explanation 1... commercial power supply, 2... rectifier, 3... assembled battery,
4...Load, 5...Data recording device, 6...Controller, (31, 32,...3n)...Each storage battery in the assembled battery, (51°52,...5→ ... Terminal connected to data recording sensor, 61 ... Equal charge drive terminal, 21 ... Control circuit, 201 ... Input signal terminal for Kyukyo charging input

Claims (1)

[Claims] 1) A DC power supply device that receives a commercial power supply, rectifies it with a rectifier and supplies it to a load, and uses the output of the rectifier to float charge an assembled battery as a backup energy source. means for detecting variations in capacity between individual storage batteries, and when the variations exceed a certain limit, a control signal is sent to a control circuit of the rectifier to cause the rectifier to uniformly charge the assembled battery; 1. Equipped with a controller that allows you to do it! ! Direct current power supply device.