High-frequency pulse direct-current oscillation charging system controlled by PLC programming

Abstract

The invention discloses a high-frequency pulse direct-current oscillation charging system controlled by PLC programming. The system is provided with a high-frequency pulse control output module, a three-phase transformer and a high-frequency pulse charging module, wherein the three-phase transformer comprises an input coil and an output coil; the high-frequency pulse control output module comprises a PS switching power supply, a PLC (programmable logic controller) and a pulse boosting transformer; the high-frequency pulse direct-current charging module comprises two pulse direct-current oscillation charging circuits, and each pulse direct-current oscillation charging circuit is connected with the output coil of the three-phase transformer, a rechargeable battery pack and a silicon controlled rectifier in series and connected with a second pulse direct-current control current in parallel; and each silicon controlled rectifier comprises an anode, a cathode and a control electrode. According to the charging system, PLC high-frequency pulse output is adopted, and intermittent high-frequency high-voltage pulse oscillation direct current is manufactured in a charging circuit through a synchronous control circuit and the silicon controlled rectifiers to charge a battery pack, so the charging current acceptance rate of the battery packs is greatly improved, and quick charging can be realized.

Description

technical field [0001] The present invention relates to the technical field of electrical automation, in particular to a method of using PLC high-frequency pulse output voltage and synchronous control circuit and silicon controlled rectifier to manufacture intermittent, saw-tooth high-frequency high-voltage pulse oscillating direct current to charge the battery pack, thereby greatly improving A charging device that has a high battery charging current acceptance rate and can realize fast charging. Background technique [0002] Electric vehicles are currently widely implemented, energy-saving and environmentally friendly green transportation vehicles. The charging device for electric vehicles usually takes 7-8 hours for a single charge; The ampere hours of charging the battery, that is, not exceeding the capacity of the battery to store electricity. [0003] Charging methods include constant current charging method, constant voltage charging method, and stage charging method....

AI Technical Summary

Problems solved by technology

[0004] 1. The constant current charging method is a charging method that keeps the charging current intensity constant by adjusting the output voltage of the charging device or changing the resistance in series with the battery. The control method is simple, but the acceptable current capacity of the battery changes with the charging process. In the later stage of charging, the charging current is mostly used to electrolyze water, thereby generating gas, which makes the outgassing excessive, so that efficient charging cannot be realized;

[0005] 2. The stage charging method is a fast charging method that combines constant current and constant voltage. First, the first stage is charged with a constant current to a predetermined voltage value, and then changed to a constant voltage for the second stage of constant voltage charging. Generally, two The switching voltage between stages is the constant voltage of the second stage. When the current decays to a predetermined value, it will switch from the second stage to the third stage for constant current charging. This method can minimize the gas output, but the The process of the method is complicated and difficult to control, and is not suitable for fast charging;

[0006] 3. In the constant voltage charging method, the voltage of the charging power source maintains a constant value during the entire charging time. With the gradual increase of the battery terminal voltage, the current gradually decreases. Compared with the constant current charging method, the charging process is closer to the optimum. Charging curve, fast charging with constant voltage, because the electromotive force of the battery is low at the initial stage of charging, the charging current is very large, and as the charging progresses, the current will gradually decrease. Therefore, only a simple control system is needed. This charging method has little electrolyzed water. Overcharge of the battery is avoided, but the current is too large at the initial stage of charging, which has a great impact on the life of the battery, and it is easy to bend the battery plate, causing the battery to be scrapped. In view of this shortcoming, constant voltage charging is rarely used, only in the charging power supply It is used when the voltage is low and the current is high. For example, when the car is running, the battery is charged by the constant voltage charging method.

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