JPS6043030A - Charge 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 the Invention The present invention relates to a charging control circuit for secondary charging of a storage battery.

Structure of a conventional example and its problems FIG. 1 shows a circuit of a conventional charger of this type.
A storage battery 5 is connected to the next winding 2 through a rectifier 4 . In the above configuration Vζ.

Since there is no circuit to fully control the charging current, there are problems such as insufficient charging or overcharging.

The 1=1 aspect of the invention This invention solves the above-mentioned problems of the conventional art! 'Il-eliminated, all circuits that eliminate σ11 on the charge side, improved quality, improved safety,
1. Structure of the Invention The charging side circuit 1 of the present invention includes a step-down transformer, a rectifier, and a first sirisk connected in series with the battery. In the secondary charging circuit 1, the anode terminal of this first thyristor is connected to the gate terminal of the first thyristor and the anode terminal of the second thyristor through a backflow prevention diode and a smoothing capacitor. Ru. Also, the gate terminal of the second cyrisk is connected to the rf of the C battery via a constant voltage diode. Connected to 5 children. When the voltage of the battery is low, the first thyrisk becomes conductive and the battery is charged, and when the voltage of the battery increases, the second thyrisk becomes conductive.

Therefore, the first thyristor becomes non-7+ and the charging rate is a111.

DESCRIPTION OF THE EMBODIMENTS The embodiments will now be described with reference to the accompanying drawings. In FIG. 2, 11 is a transformer having a primary winding 12 and a secondary winding 13, 14 is a rectifier, and 16 is a first transformer for charging control fi 111.
Thyristor 16 is! 1' battery.

17. 18 is a constant current diode and a second thyristor for detecting the completion of charging, 19 is a voltage b11: a limiting resistor, 20
is a diode for preventing backflow, and 21 is a capacitor.

Next, to explain the dynamic f'l in the above configuration, the primary winding 12 is connected to the power supply, and a low voltage is generated in the secondary winding 13. The low electric current is rectified by the device 14, and if the first thyristor 15 is in a conductive state, the storage battery 16 is charged through the first thyristor 15. The charging current at that time is determined by the impedance of the transformer 11. At this point, the voltage of the storage battery 16 reaches VC when charging is complete.

When the voltage is lower than the set voltage of the constant voltage diode 17, no current flows through the gate f111 of the second thyristor 18, and the second thyristor 18 is in a non-conducting state. A current flows into the gate terminal through the diode 2o and the resistor 19, the first thyristor 15 becomes conductive, and a charging current flows into the storage battery 16. Then, when the voltage 1F of the storage battery 16 rises to - and charging is completed, and exceeds the set voltage of the constant voltage diode 17, a current flows to the terminal 1 of the second thyristor 18, and at this time, the capacitor Since charge is stored in the second thyristor 21, a direct current flows through the second thyristor 18, and the conductive state is maintained. When the second thyristor 18 becomes conductive, the voltage at the gate terminal of the first thyristor 16 decreases, and no current flows through the gate terminal. At this time, the rectifier 1 is connected to the anode of the first iris 15.
Since only the 4VrC upstream half-wave rectified it voltage is applied and the diode 20 prevents reverse flow of the DC voltage of the capacitor 21, there is a point in time when the anode voltage becomes zero, and the first thyristor 15 becomes non-active. The battery 16 becomes conductive, and the storage battery 16 receives no current, ir, tL, and is in a charging-off state. As described above, by charging with sufficient current during charging, reliably detecting the charging light J', and completely cutting off the charging current, a safe and highly efficient charging sterilization circuit can be achieved. (1°1. can be formed.

Effects of the Invention As is clear from the above embodiments, the charge control circuit of the present invention particularly includes the second thyristor 18 and the capacitor 21.
The electric charge is maintained using t!, and the conduction state of the second thyristor 18 is maintained. + shift V and the diode 2o prevents the DC component of the capacitor 21 from flowing θ1 toward the first thyristor 15 to ensure that the first thyristor 16 is in a non-conductive state. Full'1
During 1L (1) Sufficient current is passed, and when charging is completed, the charging type i
>M, can be cut by 6(r'real V), so
It is possible to improve safety by preventing battery overcharging, and there is no need to worry about overcharging.
While charging, Daio B11 can be used, charging can be done in a short time, improving usability, and there is no need to worry about insufficient charging, improving reliability. is a great thing.

[Brief explanation of drawings]

FIG. 1 is a charging circuit diagram of a conventional ψ11, and FIG. 2 is a circuit diagram showing an embodiment of the present invention.

Claims (1)

[Claims] Electric 1: “Transformer for descending, and Preparation 1111: Equipment r! 2.
It is connected in series with the battery, and has a first silica diode, and the anode terminal of the first silica has a reverse MIF prevention diode and a smoothing capacitor. i': Connected to the gate terminal and the anode terminal of the second cell through the gate, and connected to the gate of the second cell through the r: ij terminal through the constant voltage diode. Charging side (goods) circuit.