A high-frequency intelligent fast charging method for mine-used lead-acid batteries

Abstract

The invention relates to the field of a charger, in particular to a high-frequency intelligent rapid charging method of a mine lead-acid storage battery. The charging method involves a pulse width modulation (PWM) rectifier, a bidirectional DC / DC converter, a bidirectional H-bridge inverter I, a high-frequency transformer, a bidirectional H-bridge inverter II and a storage battery pack. The charging method has the beneficial effects that a high-frequency and full-digital technology is employed to achieve the charge-discharge function, various charging methods can be more effectively achieved by combining charging and discharging, rapid charge and rapid discharge of the lead-acid storage battery are achieved, two input voltage classes of AC380 / 660V can be automatically compatible, all specifications of storage batteries can be intelligently charged, the service lifetime of the storage battery is prolonged, the application efficiency of the storage battery is improved, the mine lead-acid storage battery has a discharge function, energy waste is prevented, energy saving and environmental friendliness are achieved, the explosionproof performance and the application safety performance of the whole product are improved, and meanwhile, the mine lead-acid storage battery has high practicability.

Description

technical field [0001] The invention relates to the field of chargers, in particular to a high-frequency intelligent fast charging method for a mine-used lead-acid storage battery. Background technique [0002] To charge lead-acid batteries in coal mines, it is necessary to adopt different charging methods according to the voltage level, capacity, and condition of the batteries (new and old) of the lead-acid batteries; it is also necessary to improve the service life of lead-acid batteries in coal mines, improve the efficiency of coal mine charging operations and Use fast charging technology. According to the actual application background of coal mines, in general, high-frequency smart chargers for mine-used lead-acid batteries should have the following requirements: (1) The capacity of the charger should not be less than 55kW, the maximum charging current should be 120A, and 0-120A continuous Adjustable output; (2) To be able to charge batteries of all specifications, the ...

AI Technical Summary

Problems solved by technology

The outstanding problems of this system are: first, the charging voltage fluctuates greatly, which will damage the battery; second, the volume and weight are heavy, and the flameproof shell is heavy (above 750kg); third, the charging mode is rough and cannot fully realize intelligence. Charging will easily lead to excessive charging current, serious battery overheating, aging and deformation of the plates, etc., resulting in a greatly shortened battery life; fourth, the charging condition that the charging current and battery voltage are self-adaptive cannot be realized; Battery discharge and fast charging technology; sixth, it cannot automatically adapt to the two input voltages of AC380V / AC660, and adapts by changing the wiring mode of the primary winding of the power input transformer

[0004] The second charging method, such as figure 2 and image 3 As shown, the uncontrolled rectification - H bridge inverter - high frequency transformer - fast rectified lead-acid storage battery high frequency intelligent charging system or uncontrolled rectification - chopping - H bridge inverter ——High-frequency transformer—a high-frequency intelligent charging system for fast rectified lead-acid batteries. The outstanding problems of this system are: first, the intelligent charger automatically adapts to the AC380 / 660V voltage level and the charging voltage output by the intelligent charger should be able to The continuous adjustment between DC 0V~DC550V cannot be taken into account; secondly, when the power supply grid fluctuates greatly, it is difficult to continuously adjust the output charging voltage between DC 0V~DC550V; thirdly, it is impossible to quickly discharge the battery; Fourth, it is difficult to achieve fast charging; therefore, it is very meaningful to study high-frequency intelligent fast charging chargers for mine-used lead-acid batteries

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