Lead-acid battery charging protection module

Abstract

The utility model discloses a lead-acid battery charging protection module. Comprising a capacitor C1, a capacitor C2, a capacitor C3, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a dial switch PIN1, a dial switch PIN2, a dial switch PIN3, a dial switch PIN4, a dial switch PIN5, a dial switch PIN6, a voltage-regulator tube D1, a diode D2, a comparator U1, an MOS tube M1, an MOS tube M2 and a TL431 which are connected between a module input + and a module input-, the resistor R3 is connected between the dial switch PIN6 and the module input-; the resistor R7 is connected between the dial switch PIN5 and the module input-; and the resistor R8 is connected between the dial switch PIN4 and the module input. According to the utility model, the lead-acid battery and the charger can be protected from being damaged when a wrong charger is used, so that the charging of the lead-acid battery is more effectively guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of switch power supplies, in particular to a lead-acid battery charging protection module. Background Art

[0002] As urban congestion and environmental pollution become increasingly serious, more and more people are beginning to choose low-carbon and environmentally friendly travel methods; two-wheeled electric vehicles are gradually favored by more and more people for their advantages such as lightness, flexibility and environmental protection; at the same time, people are paying more and more attention to charging safety issues. Generally, the factory will be equipped with a dedicated charger, but sometimes the charger is not nearby or the charger is damaged, so it is possible to borrow or buy a new charger, but many people do not understand the charger specifications! There will be an unmatched charger (such as using a high-voltage charger to charge a low-voltage battery), which poses a serious safety hazard. Utility Model Content

[0003] The purpose of the utility model is to provide a lead-acid battery charging protection module to solve the problems raised in the above background technology.

[0004] To achieve the above purpose, the utility model provides the following technical solutions: a lead-acid battery charging protection module, including a capacitor C1, a capacitor C2, a capacitor C3, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a dip switch PIN1, a dip switch PIN2, a dip switch PIN3, a dip switch PIN4, a dip switch PIN5, a dip switch PIN6, a voltage regulator tube D1, and a diode D2, comparator U1, MOS tube M1, MOS tube M2, TL431, the resistor R2 is connected between the module input + and the dip switch PIN1, the resistor R3 is connected between the dip switch PIN6 and the module input -; the resistor R7 is connected between the dip switch PIN5 and the module input -; the resistor R8 is connected between the dip switch PIN4 and the module input -; the resistor R9 is connected between the dip switch PIN3 and the module input -; the resistor R10 is connected between the dip switch PIN2 and the module input -; the module input + passes through the resistor R1 and the voltage regulator D1 in sequence Connected to the module input -; one end of the resistor R6 is connected between the resistor R1 and the voltage regulator D1, and the other end is connected to the same-direction input of the comparator U1; the reverse input of the comparator U1 is between node A, the voltage input + of the comparator U1 is connected between the resistor R1 and the voltage regulator D1, the voltage input - of the comparator U1 is connected to the module input -, the resistor R11 is connected between the same-direction input and output of the comparator U1, one end of the capacitor C3 is connected between the resistor R1 and the voltage regulator D1, and the other end is connected to the module input -; the F pin and the K pin of the TL431 are connected to the same-direction input of the comparator U1 The A pin of TL431 is connected to the ground; the base of MOS tube M2 is connected to the output end of comparator U1, the source is connected to the ground, and the drain is connected to resistor R5; resistor R4 is connected between the source and base of MOS tube M1, one end of resistor R5 is connected to resistor R4, and the other end is connected to the drain of MOS tube M2; the source of MOS tube M2 is connected to the module input +, the drain is connected to the anode of diode D2, and the base is connected between resistors R4 and R5; the cathode of diode D2 is connected to the module output +; capacitor C2 is connected between module output + and module output -.

[0005] Compared with the prior art, the beneficial effects of the utility model are:

[0006] 1. A charging protection module is connected between the charger output and the battery. By monitoring the output voltage of the charger, when the charging voltage is higher than the safe voltage of the battery, the protection module disconnects the charging network to achieve protection;

[0007] 2. It can avoid using the wrong charger and protect the lead-acid battery and the charger itself from being damaged, providing more effective protection for the charging of the lead-acid battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a circuit diagram of the utility model. DETAILED DESCRIPTION

[0009] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0010] See also Figure 1The utility model provides a technical solution: a lead-acid battery charging protection module, including a capacitor C1 connected between a module input + and a module input -, a capacitor C2, a capacitor C3, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a dip switch PIN1, a dip switch PIN2, a dip switch PIN3, a dip switch PIN4, a dip switch PIN5, a dip switch PIN6, a voltage regulator tube D1, a diode D2, and a comparator U1, MOS tube M1, MOS tube M2, TL431, the resistor R2 is connected between the module input + and the dip switch PIN1, the resistor R3 is connected between the dip switch PIN6 and the module input -; the resistor R7 is connected between the dip switch PIN5 and the module input -; the resistor R8 is connected between the dip switch PIN4 and the module input -; the resistor R9 is connected between the dip switch PIN3 and the module input -; the resistor R10 is connected between the dip switch PIN2 and the module input -; the module input + is connected to the module through the resistor R1 and the voltage regulator D1 in sequence Input -; one end of resistor R6 is connected between resistor R1 and voltage regulator D1, and the other end is connected to the same-direction input of comparator U1; the reverse input of comparator U1 is between node A, the voltage input + of comparator U1 is connected between resistor R1 and voltage regulator D1, the voltage input - of comparator U1 is connected to the module input -, resistor R11 is connected between the same-direction input and output of comparator U1, one end of capacitor C3 is connected between resistor R1 and voltage regulator D1, and the other end is connected to the module input -; the F pin and K pin of TL431 are connected to the same-direction input of comparator U1, The A pin of TL431 is connected to the ground; the base of MOS tube M2 is connected to the output end of comparator U1, the source is connected to the ground, and the drain is connected to resistor R5; resistor R4 is connected between the source and base of MOS tube M1, one end of resistor R5 is connected to resistor R4, and the other end is connected to the drain of MOS tube M2; the source of MOS tube M2 is connected to the module input +, the drain is connected to the anode of diode D2, and the base is connected between resistors R4 and R5; the cathode of diode D2 is connected to the module output +; capacitor C2 is connected between module output + and module output -.

[0011] The working principle of the utility model is as follows: first, a reference voltage of 2.5V is set at the same-direction input end of the comparator U1. For different battery packs (the voltages of battery packs commonly used on the market are 48V, 60V, 72V, 84V, and 96V), the corresponding resistance value is selected by toggling the code switch K1 to match the corresponding protection voltage point. The protection function is realized by comparing the charging voltage with the reference voltage to make U1 output high and low levels. When the voltage at the same-direction end of U1 is higher than that at the reverse end, U1 outputs a high level to turn on the MOS tube M2. At this time, the voltage of R4 and R5 divides the source voltage of M1 to be higher than the base voltage. The MOS tube M1 is turned on and can be charged. When the voltage at the same-direction end of U1 is lower than that at the reverse end, U1 outputs a low level to turn off the MOS tube M2. At this time, R4 and R5 are not conductive to the ground, no current passes, and there is no voltage drop across R4. The MOS tube M1 cannot be turned on and cannot be charged.

[0012] The first case: When the output voltage of the charger is higher than the battery voltage, if the charger's adaptable voltage segment overlaps with the battery's normal charging segment, charging can begin. However, when the charging voltage rises to the set protection voltage, charging stops and further charging is prohibited. If the charger's adaptable voltage segment does not overlap with the battery's normal charging segment, charging is not possible, and the protection module is triggered when the charging interface is plugged in. Both can achieve the purpose of protecting the battery from overvoltage.

[0013] The second situation: When the charger voltage is lower than the battery voltage, the protection module uses diode D2 to prevent the battery voltage from flowing back to the charger and damaging the charger.

[0014] For example: The operating voltage range of a lead-acid battery is 10.5V-15V.

[0015] The charging voltage range of a 48V battery is: 42V-60V, and the corresponding charger should meet this voltage range;

[0016] The charging voltage range of a 60V battery is: 52.5V-75V, and the corresponding charger should meet this voltage range;

[0017] The charging voltage range of a 72V battery is: 63V-90V, and the corresponding charger should meet this voltage range;

[0018] The charging voltage range of 84V battery is: 73.5V-105V, and the corresponding charger should meet this voltage range;

[0019] The charging voltage range of a 96V battery is: 84V-120V, and the corresponding charger should meet this voltage range;

[0020] For example, when using a charger that matches a 72V battery pack to charge a 48V battery pack, charging is impossible because there is no overlap in the voltage segments. When using a charger that matches a 72V battery pack to charge a 60V battery pack, charging is possible because there is an overlap in the voltage segments, but charging stops when the charging voltage rises to the set protection voltage and further charging is prohibited. When using a charger that matches a 48V battery pack to charge a 72V battery pack, the module's backflow protection function is triggered to protect the charger from damage.

[0021] The charging process of the charger of the utility model consists of two parts: constant voltage charging and constant current charging. When charging at constant current, the voltage of the battery is gradually increased. If the charger used is not matched, the termination voltage of the charger will be higher than the voltage of the battery. This module sets a reference voltage. When the voltage exceeds the reference voltage, the output charging network will be disconnected to achieve the purpose of protection.

[0022] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in the field. Although the embodiments of the utility model have been shown and described, it is understandable to those of ordinary skill in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principle and spirit of the utility model. The scope of the utility model is defined by the attached claims and their equivalents.

Claims

1. A lead-acid battery charging protection module, characterized in that: Including capacitor C1 connected between module input + and module input -, capacitor C2, capacitor C3, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, resistor R8, resistor R9, resistor R10, resistor R11, dip switch PIN1, dip switch PIN2, dip switch PIN3, dip switch PIN4, dip switch PIN5, dip switch PIN6, voltage regulator D1, diode D2, comparator U1, MOS tube M1, MOS tube M2, TL43 1, the resistor R2 is connected between the module input + and the DIP switch PIN1, the resistor R3 is connected between the DIP switch PIN6 and the module input -; the resistor R7 is connected between the DIP switch PIN5 and the module input -; the resistor R8 is connected between the DIP switch PIN4 and the module input -; the resistor R9 is connected between the DIP switch PIN3 and the module input -; the resistor R10 is connected between the DIP switch PIN2 and the module input -; the module input + is connected to the module input - through the resistor R1 and the voltage regulator D1 in sequence; one end of the resistor R6 is connected to the resistor R1 is connected between the voltage regulator tube D1, and the other end is connected to the same-direction input terminal of the comparator U1; the reverse input terminal of the comparator U1 is connected to the node A, the voltage input + of the comparator U1 is connected between the resistor R1 and the voltage regulator tube D1, the voltage input - of the comparator U1 is connected to the module input -, the resistor R11 is connected between the same-direction input terminal and the output of the comparator U1, one end of the capacitor C3 is connected between the resistor R1 and the voltage regulator tube D1, and the other end is connected to the module input -; the F pin and the K pin of the TL431 are connected to the same-direction input terminal of the comparator U1, the A pin of the TL431 The base of MOS tube M2 is connected to the output end of comparator U1, the source is connected to the ground, and the drain is connected to resistor R5; resistor R4 is connected between the source and base of MOS tube M1, one end of resistor R5 is connected to resistor R4, and the other end is connected to the drain of MOS tube M2; the source of MOS tube M2 is connected to the module input +, the drain is connected to the anode of diode D2, and the base is connected between resistors R4 and R5; the cathode of diode D2 is connected to the module output +; capacitor C2 is connected between module output + and module output -.

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