JPS6059929A - Charging control circuit - 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 FIELD OF INDUSTRIAL APPLICATION The present invention relates to a charging control circuit for controlling charging of a storage battery.

Structure of a conventional example and its problems Figure 1 shows a circuit of a conventional charger of this type. In the above configuration, there is no charge completion control, so the battery life may be shortened due to undercharging or overcharging, or the battery life may be shortened due to insufficient charging or overcharging.

There were problems with batteries not being able to be used for the expected amount of time, and the amount of charge varying depending on the ambient temperature.

OBJECTS OF THE INVENTION The present invention eliminates these conventional drawbacks, and aims to provide a charging control circuit that can completely charge the battery even if the ambient temperature changes.

Structure of the Invention In the present invention, the voltage of the battery increases during charging, and a constant voltage diode is connected to the gate of the thyristor via a thermistor to detect when the voltage reaches the charging completion voltage. Also, the voltage at the completion of charging is corrected, and the amount of charge is compensated for by the temperature.

Description of examples Examples thereof will be described below with reference to the accompanying drawings.

In FIG. 2, a diode 16 and a capacitor 17 are connected to the secondary winding 12 of a power transformer 13 having a primary winding 11 and a secondary winding 12 via a rectifier 14 to form a DC power source. 19 is a constant voltage diode that detects the voltage of the storage battery 16 when charging is completed; 18 is a first thyristor that controls charging; when the power is connected, the diode 16. Since a signal passes through the resistor 21 and enters its gate, the thyristor 18 turns ON and charges the storage battery 15. The voltage during charging of the storage battery 15 gradually increases after power is supplied.

Then, when charging is completed, it rises rapidly and reaches saturation. By the way, this rise characteristic differs depending on the difference in ambient temperature. That is, when the ambient temperature is high, the time for rapid rise is delayed and the saturation voltage is low. On the other hand, when the ambient temperature is low, the point at which the temperature rises rapidly becomes early and saturation is high. In accordance with this characteristic, the gate of the thyristor 20 of i2 is connected in series with the constant voltage diode 19 via the thermistor 22. That is, the current flowing into the gate of the second thyristor 20 is controlled by the thermistor 22, and when the ambient temperature is high, the voltage of the fully charged storage battery is low, and when the ambient temperature is low, the voltage of the fully charged storage battery is high.

Effects of the Invention As is clear from the above embodiments, the present invention has a simple structure and can complete charging at a voltage of the storage battery that matches the ambient temperature using a thermistor. This eliminates variations in the amount of charge due to differences in ambient temperature, and enables reliable charging without undercharging or overcharging even if there are differences in ambient temperature. Therefore, it is possible to prolong the life of a storage battery, make its use time constant, and put the storage battery in a state where it can be used to the maximum extent, and has extremely high industrial value.

[Brief explanation of drawings]

FIG. 1 is a conventional charging control circuit diagram for a storage battery, and FIG. 2 is a charging control circuit diagram for controlling charging of a storage battery showing an embodiment of the present invention. 15... Storage battery, 18... First thyristor, 19... Constant voltage diode, 2o...
...Second thyristor, 22...Thermistor.

Claims (1)

[Claims] Charging control in which the gate of a first thyristor connected in series with a storage battery is connected to the anode of a second thyristor, and the gate of the second thyristor is connected to a thermistor to the storage battery via a series circuit with a constant voltage diode. circuit.