CN102035243A - Multi-type battery intelligent charging system and control method based on switching power supply - Google Patents

Abstract

The invention discloses a multi-type battery intelligent charging system based on a switching power supply and a control method, wherein the multi-type battery intelligent charging system comprises an input circuit, the input circuit is connected with an EMI suppression module, the EMI suppression module is connected with a primary rectification filter module, one path of the primary rectification filter module is connected with a transformer circuit through an RCD peak suppression module, and the other path of the primary rectification filter module is connected with a switching power supply PWM module; the output end of the transformer circuit is connected with the output control module and the auxiliary power supply module; the output control module is connected with a battery state detection module; the signal feedback module is connected with the constant current control module, and the constant current control module is connected with the battery state detection module. The invention can independently charge Ni-Cd/Ni-MH/Li-ion rechargeable batteries, and can mix batteries with different capacities for charging; after the rapid constant-current charging, trickle charging is carried out to keep the electric quantity of the battery; the battery-delta V, the maximum voltage, the maximum temperature and the charging time can be detected, and whether the battery is fully charged or not is judged according to the detection result, and corresponding action is taken, so that the charging process is safer, and the like.

Description

Multi-type battery intelligent charging system and control method based on switching power supply

technical field

The invention relates to the technical field of charging equipment, and relates to an intelligent charging system for safely and quickly charging a rechargeable battery.

Background technique

The charging process of the battery has the greatest impact on its life, while the impact of the discharging process is less, that is to say, most of the batteries are not used up, but charged. It can be seen that a good charger has a very critical impact on the life of the battery. A good charger needs a combination of good hardware and scientific software to protect the life of the battery to the greatest extent. For this reason, people have made unremitting efforts to make the charger better and better. If there is a fully intelligent pulse charger, this charger has the advantage of being able to charge the battery to a saturated state and protect the battery; Frequency pulse charger, which can effectively repair rechargeable batteries, prolong battery life, and has perfect protection functions. However, these solutions still have many defects while making progress. For example, during the charging process, the change of temperature will have a significant impact on the charging process, and the existing technology is not ideal in solving the impact of temperature on charging; and the daily The battery used cannot work in a constant temperature environment for a long time, so it is not perfect to use the same mode to charge the battery. In addition, the current charging technologies are all classified, that is, different types of batteries should be charged with corresponding chargers, such as NI-Cd (nickel cadmium), Ni-MH (nickel metal hydride), Li-ion (lithium battery) batteries etc. need to be charged with Ni-Cd battery charger, Ni-MH battery charger, and Li-ion battery charger respectively, otherwise the battery will be damaged, which will bring great inconvenience to use and cause waste of resources .

Contents of the invention

The technical problem to be solved by the present invention is to provide a kind of rapid charging that can independently charge NI-Cd (nickel cadmium), Ni-MH (nickel metal hydride), and Li-ion (lithium electricity) rechargeable batteries of different capacities. For the detection of charging current, maximum voltage, maximum temperature, and charging time, an intelligent software control algorithm is used to achieve the purpose of depolarization and increase the acceptable current, and to meet the maximum speed and safety without reducing the number of battery cycles. A multi-type battery intelligent charging system based on a switching power supply required by charging and a control method thereof.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions: a multi-type battery intelligent charging system based on switching power supply, which is characterized in that: it includes an input circuit, the input circuit is connected to an EMI suppression module, and the EMI suppression module is connected to a primary rectification and filtering module. One of the primary rectification and filtering modules is connected to the transformer circuit through the RCD spike suppression module, and the other is connected to the PWM module of the switching power supply; one of the output terminals of the transformer circuit is connected to the output control module, and the other is connected to the auxiliary power module; the output control module is connected to the battery status detection module; The charging system also includes a constant current control module and a signal feedback module, the signal feedback module is connected to the constant current control module, and the constant current control module is connected to the battery state detection module.

Furthermore, the charging system is also equipped with a temperature sensor for sensing the temperature of the battery or the internal circuit. When the battery or the internal circuit is overheated, the indicator light will flash alternately to give an alarm and stop charging.

Furthermore, a lightning strike protection module is also connected before the input circuit, so as to avoid damage to the battery due to lightning strikes.

The charging system adopts the following control method: after the initialization procedure, determine the battery type according to the difference of the NTC of the battery, and set the corresponding upper voltage limit, and then set the standby mode; detect the battery over-temperature frequency, if the over-temperature frequency is 30KHz, then Detect the current, if the over-temperature frequency is 60KHz, start the over-temperature protection subroutine, the program controls the over-temperature frequency to drop to 30KHz, and the system returns to initialization; detect the current, if the current ≤ 60mA, the system returns to the standby mode; if the current ≥ 60mA, pre-charge the battery for 12s, and repair it with trickle; then detect the voltage, if the voltage is ≥12.5V, perform 1.3A constant current fast charging; if the voltage is ≤12.5V, continue pre-charging, and repair the battery with trickle , after the voltage ≥ 12.5V, switch to 1.3A constant current fast charging; if the pre-charged repair battery exceeds 60s and the voltage ≤ 12.5V, the system will start the battery damage protection subroutine, and return to initialization after the battery fault is eliminated; after charging is completed, Detect the battery over-temperature frequency again. If the over-temperature frequency is 30KHz, then detect the current. If the over-temperature frequency is 60KHz, start the over-temperature protection subroutine. This program controls the over-temperature frequency to drop to 30KHz, and the system returns to initialization; check the current again , if the current ≤ 120mA, the system enters the battery full program; if the current ≥ 120mA, it returns to 1.3A constant current fast charging, and transfers to the battery full program after 90 minutes; remove the battery after fully charged, and the system resets and restarts.

Compared with the charging system of the traditional charger, the present invention has the following advantages: by adopting a unique software control algorithm, Ni-Cd/Ni-MH/Li-ion rechargeable batteries can be charged independently, and batteries of different capacities can be mixed for charging ;After fast constant current charging, switch to trickle charging to maintain battery power; can obtain different constant current and constant voltage curves; can detect battery -ΔV, maximum voltage, maximum temperature, charging time, and judge whether it is fully charged and Take corresponding actions to make the charging process safer to avoid overcharging or undercharging the battery; built-in temperature sensor, when the battery or internal circuit is overheated, the indicator light will flash alternately to alarm and stop charging; it has battery polarity reverse protection, Short-circuit protection function, which can automatically detect the battery and display a faulty battery, avoid charging defective batteries or alkaline batteries, and the red light will flash and alarm; when the battery is fully charged and re-inserted, the saturation state can be tested in a short time, And stop charging; when the battery voltage is very low, charge with a small current to restore the damaged battery; there is a charging time limit and double-layer protection.

Description of drawings

Fig. 1 is a circuit schematic diagram of the present invention;

Fig. 2 is the operation flowchart of the present invention.

Detailed ways

In this embodiment, referring to FIG. 1, the multi-type battery intelligent charging system based on switching power supply includes an input circuit, the input circuit is connected to the EMI suppression module 2, the EMI suppression module 2 is connected to the primary rectification and filtering module 3, and the primary rectification and filtering module 3 One path is connected to the transformer circuit through the RCD spike suppression module 4, and the other path is connected to the switching power supply PWM module 5; one path of the output end of the transformer circuit is connected to the output control module 7, and the other path is connected to the auxiliary power supply module 6; the output control module 7 is connected to a battery status detection module 8; The charging system also includes a constant current control module 9 and a signal feedback module 10, the signal feedback module 10 is connected to the constant current control module 9, and the constant current control module 9 is connected to the battery state detection module 8.

The charging system is also equipped with a temperature sensor for sensing the temperature of the battery or the internal circuit. When the battery or the internal circuit is overheated, the indicator light will flash alternately to alarm and stop charging.

A lightning protection module 1 is also connected before the input circuit, which can prevent the battery from being damaged by lightning.

Referring to Figure 2, the charging system adopts the following control method: After the initialization procedure, determine the battery type according to the difference of the NTC of the battery, and set the corresponding upper voltage limit, and then set the standby mode; detect the battery over-temperature frequency, if the over-temperature frequency If the over-temperature frequency is 30KHz, then detect the current. If the over-temperature frequency is 60KHz, start the over-temperature protection subroutine. This program controls the over-temperature frequency to drop to 30KHz, and the system returns to initialization; if the current is less than or equal to 60mA, the system returns to the set standby mode ; If the current ≥ 60mA, pre-charge the battery for 12s and repair it with trickle flow; then detect the voltage, if the voltage ≥ 12.5V, perform 1.3A constant current fast charging; if the voltage ≤ 12.5V, continue pre-charging, Trickle repair battery, after the voltage ≥ 12.5V, switch to 1.3A constant current fast charging; if the pre-charge repair battery exceeds 60s and the voltage ≤ 12.5V, the system will start the battery damage protection subroutine, and return to initialization after the battery failure is eliminated; After the charging is completed, check the battery over-temperature frequency again. If the over-temperature frequency is 30KHz, check the current. If the over-temperature frequency is 60KHz, start the over-temperature protection subroutine, which controls the over-temperature frequency to drop to 30KHz, and the system returns to initialization ;Check the current again, if the current is ≤120mA, the system will enter the battery full program; if the current is ≥120mA, it will return to 1.3A constant current fast charging, and transfer to the battery full program after 90 minutes; after fully charged, remove the battery, and the system will reset and restart .

The technical parameters of the charger corresponding to this embodiment are as follows:

Input voltage: AC220-240V/50Hz

Precharge voltage: ≤12.5V

Precharge current: 300mA±50mA

Pre-charge time: the shortest: 10s, the longest: 300s

Fast charge constant current: 1.3A

Fast charge constant voltage: 21.5V

Maximum charging time: 60+/-5min

Charging termination discrimination current: 60～100mA

Normal charging temperature range: 0-50°C

Maximum input power: 45W

Charging efficiency: ≥70%

Standby power consumption: ≤0.5W

The present invention has been described in detail above. The foregoing description is only a preferred embodiment of the present invention, and should not limit the implementation scope of the present invention. within the scope of the invention.

Claims (4)

1. A multi-type battery intelligent charging system based on switching power supply, characterized in that: it includes an input circuit, the input circuit is connected to an EMI suppression module, the EMI suppression module is connected to a primary rectification and filtering module, and the primary rectification and filtering module is connected through an RCD spike suppression module all the way Transformer circuit, the other way is connected to the PWM module of the switching power supply; one way of the output end of the transformer circuit is connected to the output control module, and the other way is connected to the auxiliary power supply module; the output control module is connected to a battery state detection module; the charging system also includes a constant current control module and A signal feedback module, the signal feedback module is connected to the constant current control module, and the constant current control module is connected to the battery state detection module. 2. The multi-type battery intelligent charging system based on switching power supply according to claim 1, characterized in that: the charging system is also provided with a temperature sensor for sensing the temperature of the battery or the internal circuit. 3. The multi-type battery intelligent charging system based on switching power supply according to claim 1, characterized in that: a lightning protection module is also connected before the input circuit. 4. The control method of the multi-type battery intelligent charging system based on switching power supply according to claim 1, characterized in that: first initialize the program, then determine the battery type according to the difference of the NTC of the battery, and set the corresponding upper voltage limit, Then set the standby mode; detect the battery over-temperature frequency, if the over-temperature frequency is 30KHz, then detect the current, if the over-temperature frequency is 60KHz, start the over-temperature protection subroutine, which controls the over-temperature frequency to 30KHz, and the system returns to initialization ; Check the current, if the current ≤ 60mA, the system will return to the set standby mode; if the current ≥ 60mA, pre-charge the battery for 12s, and repair it with a trickle; then check the voltage, if the voltage ≥ 12.5V, then perform 1.3A constant If the voltage is less than or equal to 12.5V, then continue pre-charging, trickle repair the battery, and switch to 1.3A constant current fast charging after the voltage is greater than or equal to 12.5V; Start the battery damage protection subroutine, and return to initialization after the battery fault is eliminated; after charging is completed, check the battery over-temperature frequency again, if the over-temperature frequency is 30KHz, then detect the current, if the over-temperature frequency is 60KHz, start the over-temperature protection subroutine Program, the program controls the over-temperature frequency to drop to 30KHz, the system returns to initialization; check the current again, if the current ≤ 120mA, the system enters the battery full program; Enter the battery full program; remove the battery after fully charged, the system resets and restarts.

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