JPH0556571A - Charger apparatus for storage battery - Google Patents

Abstract

PURPOSE:To prevent insufficient charge or overcharge of a battery by determining the charge condition of the battery by a specific gravity of an electrolyte of the battery, by determining and selecting an appropriate mode of the battery temperature, and by switching a charge control mode automatically. CONSTITUTION:The temperature of a battery 8 is detected by a detector 11a and a temperature signal output from the detector 11a is compared with a predetermined set value by a comparator 12a. A specific gravity of the battery 8 is detected by a detector 11b and a specific gravity signal output from the detector 11b is compared with a predetermined set value by a comparator 12b. The output from the comparator 12a and the output from the comparator 12b are inputted into a determination circuit 13 and then a control mode of a charger is outputted from the determination circuit 13. Based on a mode signal from the determination circuit 13, charge control of the battery 8 is switched by a mode automatic setting circuit 7. By this method, overcharge or insufficient charge of the battery can be prevented and thereby an effective charger apparatus can be provided from which energy conservation can be expected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage battery charging device for charging a storage battery.

[0002]

2. Description of the Related Art Conventionally, a storage battery charging device charges a storage battery by converting an AC power source into an appropriate voltage by a transformer and then converting it into a direct current of a predetermined voltage by a thyristor charger. There are two types of charge modes for the storage battery: floating charge and equal charge.For equal charge, maintenance personnel perform a manual equalization on a regular basis to maintain the performance of the storage battery, and when the storage battery discharges during a power failure, power recovery is performed. After that, there is a recovery charge in which the charge state of the storage battery is automatically charged evenly in order to return to the original state in preparation for the next power failure. Then, the voltage of the uniform charging is set higher than the voltage of the floating charging performed to supplement the natural discharge of the storage battery. As a general operation of the switching control of each of these charging modes, if the mode selection switch is set to manual equalization, the charger is charged uniformly, and if the mode selection switch is automatically selected, it is normally floating. After charging and recovery from a power failure, the timer is set to automatically charge the battery for a predetermined period of time and then return to the floating charging state.

[0003]

That is, the switching between the floating charging and the uniform charging in the prior art is performed in a simple and fixed pattern regardless of the state of charge of the storage battery. On the other hand, the charging / discharging performance of the storage battery changes depending on the temperature of the storage battery, and if the temperature is high, the battery is easily charged, and conversely, if the temperature is low, the battery is not easily charged. Therefore, even if the batteries are charged equally in the installation environment with different ambient temperatures for the same time, the state of charge of the storage battery is different, and when the ambient temperature is low, insufficient charging may occur and a predetermined power outage compensation station cannot be secured. On the contrary, if the ambient temperature is too high, the storage battery may be overcharged, and there is a risk of thermal runaway or explosion.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and provide a storage battery charging device that always keeps the state of charge of the storage battery proper.

[0005]

The present invention provides a first detector for detecting the temperature of a storage battery, and a first detector for comparing a temperature signal output from the first detector with a predetermined temperature set value. A comparator, a second detector for detecting the specific gravity of the storage battery, a second comparator for comparing the specific gravity signal output from the second detector with a predetermined specific gravity set value, and the first and the second comparators. Storage battery charging comprising a determination circuit that inputs the output of the second comparator and outputs the control mode of the charging device, and a mode automatic setting circuit that switches the charging control of the storage battery according to the mode signal from this determination circuit It is a device.

[0006]

[Function] The state of charge of the storage battery is determined by the electrolytic solution specific gravity of the storage battery, and an appropriate mode of floating charging and uniform charging is determined and selected based on the relationship with the temperature of the storage battery, and the charging control mode is automatically switched. To prevent undercharging and overcharging.

[0007]

EXAMPLE An example of the present invention will be described below.

FIG. 1 shows a detector 1 for detecting the temperature of the storage battery 8.
0a, a comparator 11a that compares the temperature signal output from the detector 10a with a predetermined temperature set value, a detector 10b that detects the specific gravity of the storage battery 8, and a specific gravity signal output from the detector 10b in advance. A comparator 11b that compares the set specific gravity value, a determination circuit 13 that inputs the outputs of the comparators 11a and 11b and outputs the control mode of the charging device, and a charging signal for the storage battery 8 by a mode signal from the determination circuit 13. 2 shows a storage battery charging device including an automatic mode setting circuit 7 for switching between the two. That is, in the storage battery charging device, the detection unit 10 that detects the temperature and the specific gravity of the storage battery 8.
a, 10b, and comparators 11a, 11b and comparators 11a, 11b for comparing the outputs of the detectors 10a, 10b with set values.
The determination circuit 13 that outputs the control mode of the charging device using the output of the
The storage battery charging device is characterized in that the charging control mode is automatically switched according to the relationship between the temperature and the specific gravity.

Information on the temperature and specific gravity of the storage battery 8 is input to the automatic mode setting circuit 7, the proper automatic charging control mode is determined and selected by the automatic mode setting circuit 7, and the output is output from the charger control circuit. It becomes a control condition to control the thyristor charger 5. The temperature and specific gravity information detected by the temperature sensor 10a and the specific gravity sensor 10b attached to the storage battery are input to the respective detectors 11a and 11b and converted into appropriate signals, and then the comparator 12a at the next stage. ，
12b is input. The comparators 12a and 12b are provided with three reference levels for each of the temperature and the specific gravity, and these reference values set in advance and the detectors 11a, 1 are set.
The signals from 1b are compared, and the signals are sent out when the signals from the detectors 11a and 11b are equal to or higher than the reference value. The determination circuit 13 determines the information about the storage battery temperature and the specific gravity state obtained by the comparators 12a and 12b based on the combination condition shown in FIG. 2, and the charge control mode condition of the charger is determined by the next-stage charger control circuit 6. Send out. FIG. 3 is a diagram showing a specific circuit example for obtaining the control mode output in the relation diagram of the control mode and the combination condition of the temperature and the specific gravity shown in FIG. Temperature is standard 2
If it is above, or if the specific gravity is 3 or more, to prevent overcharging, and to save energy, gate block the thyristor of the charger and stop the charger. Further, when the temperature becomes equal to or higher than the reference value 3, an alarm for excessive temperature rise of the storage battery is sent out. Equal charging has a specific gravity when the temperature is between the reference 1 and the reference 2 until the specific gravity reaches the reference 1, and when the temperature is lower than the reference 1 it quickly approaches the full charge so as not to cause insufficient charging. The process is repeated until the standard 2 which is higher than the standard 1 is reached. Floating charging is performed in areas where the charger is neither stopped nor evenly charged.

[0010]

According to the present invention, it is possible to provide an efficient storage battery charging device capable of preventing overcharge or undercharge of a storage battery and expecting an energy saving effect.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a charging device showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing control conditions of FIG.

FIG. 3 is an explanatory diagram showing a control flow of a determination circuit.

[Explanation of symbols]

 6 ... Charger control circuit 7 ... Mode automatic setting circuit 10a, 10b ... Sensor 11a, 11b ... Detector 12a, 12b ... Comparator 13 ... Judgment circuit

Claims (1)

[Claims] 1. A first detector for detecting a temperature of a storage battery, a first comparator for comparing a temperature signal output from the first detector with a predetermined temperature set value, and a first detector for the storage battery. A second detector for detecting the specific gravity, a second comparator for comparing the specific gravity signal output from the second detector with a predetermined specific gravity set value, and the first and second comparators A storage battery charging device comprising: a determination circuit that inputs an output and outputs a control mode of the charging device; and a mode automatic setting circuit that switches charging control of the storage battery according to a mode signal from the determination circuit.