JPH0626859Y2 - Power supply - Google Patents

Description

TECHNICAL FIELD The present invention relates to a power supply device, and more specifically, to reliability of a battery in a power supply device that supplies DC power to a load while floatingly charging a sealed lead-acid battery. Is related to the improvement of.

2. Description of the Related Art Conventional technology and its problems Many power supply devices that supply DC power to a load while floating-charging a storage battery are using a sealed lead storage battery in response to the demand for maintenance-free operation. In recent years, the capacity of the sealed lead-acid battery has also increased, and the number of power supply devices equipped with the sealed lead-acid battery of large capacity has increased, and it has become possible to cope with various loads. However, the sealed lead-acid battery is known to greatly affect the battery life depending on its usage conditions, that is, the floating charging voltage, the ambient temperature, etc., and therefore, it may be unreliable for an important load.

The purpose of the present invention is to solve the above-mentioned drawbacks by approximating the change characteristics of the life of a sealed lead-acid battery charged with a constant floating charging voltage with ambient temperature with a polygonal line and responding to this polygonal line at each ambient temperature. The purpose of the present invention is to improve the reliability of the power supply device by counting the generated pulses and displaying the change status of the remaining life so that the sealed lead acid battery can be replaced accurately.

The power supply device of the present invention includes a ROM in which the characteristics of the change in the life of the sealed lead acid battery charged with a constant floating charging voltage due to the ambient temperature are approximated by broken lines and the ambient temperature of the sealed lead acid battery. And a temperature sensor that detects the ambient temperature by the temperature sensor, outputs a pulse corresponding to the change characteristic of the life at the temperature from the ROM, counts the pulse, and keeps the count number constant. The counter is provided with a display signal each time the value is reached and a voice life advance notice signal when the count reaches a predetermined value.

Examples Hereinafter, examples will be described. FIG. 1 is a block diagram of a power supply device of the present invention, which has a basic configuration including an AC input terminal 1 to which an AC power supply is connected, and a charging device 2 which receives the AC and outputs a DC having a constant voltage constant current characteristic. , This charging device 2
It is composed of a sealed lead-acid battery 3 which is floatingly charged by, a load 4 to which the direct current is supplied, and a load terminal 5. The load 4 is an inverter if it obtains an AC uninterruptible output at the load terminal 5, and a load voltage compensator if it obtains a highly accurate DC voltage at the load terminal 5. A feature of the present invention is that a temperature sensor 7 that detects the ambient temperature in an analog manner is attached in the vicinity of the sealed lead-acid battery 3 of the main circuit portion 6 of the power supply device as described above, and is charged with a constant floating charging voltage. ROM 8 in which the characteristics of the change in the life of the sealed lead-acid battery 3 according to the ambient temperature are approximated by broken lines and stored.
Is provided, and the ROM 8 outputs a number of pulses corresponding to the change characteristics of the life at the ambient temperature. The output pulse is input to the counter unit 9 and counted, and a display signal is sent to the display unit 10 every time the count reaches a certain value. Then, when the count number reaches a predetermined value, the counter unit 9 sends a life advance notice signal to the voice IC 12. This predetermined value may be set near the remaining life of the sealed lead-acid battery 3 of 5 to 10%. Further, the voice signal from the voice IC 12 is input to the speaker 12 so that the life is announced by voice.

The ROM 8 described above is provided with a backup power supply 11 to prevent data loss due to a power failure or the like. In addition,
The temperature sensor 7, the ROM 8, the counter unit 9, the display unit 10, and the voice IC 12 can be reduced in size, weight, and cost due to the progress of integrated circuit technology. The reliability of the power supply device can be improved by mounting it on the panel board of the device or by enabling the signal of the display circuit unit 14 to be transmitted from a distance.

Next, the principle will be described. The broken line in Fig. 2 shows the relationship between the ambient temperature and the minimum guaranteed value of battery life when the floating charging voltage of a sealed lead-acid battery is 2.275V / cell at 20 ° C, and the capacity is 80% of the rated capacity. It is determined that the life has expired. From FIG. 2, the ambient temperature is 5 to 25 ° C.
In that case, it can be seen that the minimum guaranteed value is reached in about 7 years, and the life is shortened almost linearly at 25 ° C or higher. Based on this characteristic, the change characteristic of the life with respect to the ambient temperature is approximated by a broken line such as the solid line in FIG.
In addition to being stored in M8, the number of pulses corresponding to the change characteristic is output from ROM8. Ie ROM
The number P of pulses to be output from 8 is a constant value C when the ambient temperature is −10 to 25 ° C. and a straight line such as P = aT + b when the ambient temperature is 25 ° C. or higher, as shown by the dashed line in FIG. The configuration is such that it will increase. (T: Ambient temperature) For example, if the number of pulses output from the ROM 8 is one pulse per second, continuous use at 40 ° C will produce 4,3
Since it reaches the end of life in a year, if converted into the number of pulses, 60 × 60
X24 x 365 x 4.3 = 135,604.8 x 10 ³ . For example, as shown in FIG. 1, when the number of pulses increases by 10%, the light emitting diodes provided in the display unit 10 are turned on one by one, and the ninth LED is turned on and at the same time the voice IC is turned on.
If a life advance notice signal is also sent to 12, the notice of replacement of the sealed lead storage battery 3 can be made visually and audibly.

The flow chart of the above principle is as shown in FIG. That is, the number of pulses is weighted according to the ambient temperature T.

Although the number of pulses is weighted according to the ambient temperature T in the above embodiment, the same effect can be obtained by weighting the pulse generation period. In this case, if the ambient temperature is 25 ° C. or higher, the pulse generation period may be linearly shortened.

Effect of the Invention As described in detail in the embodiments, the power supply device of the present invention can accurately display the life of the sealed lead-acid battery built in the power supply device, so that the reliability of the device can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram of a power supply device of the present invention, FIG. 2 is a diagram for explaining the principle of the present invention device, and FIG. 3 is a flow chart of the device of the present invention. 2 ... Charging device, 3 ... Sealed lead-acid battery 4 ... Load, 7 ... Temperature sensor 8 ... ROM, 9 ... Counter section 10 ... Display section, 11 ... Backup power supply 12 ... Voice IC , 13 …… Speaker

Claims (1)

[Scope of utility model registration request] 1. A ROM for storing the characteristics of the change in the life of a sealed lead acid battery charged with a constant floating charging voltage depending on the ambient temperature by approximating it with a broken line, and a temperature sensor for detecting the ambient temperature of the sealed lead acid battery. And detecting the ambient temperature by the temperature sensor, outputting a pulse corresponding to the change characteristic of the life at the temperature from the ROM, counting the pulses, and displaying each time the count reaches a constant value. A power supply device comprising a counter unit that sends out a signal and sends out a life advance notice signal by voice when the count number reaches a predetermined value.