Intelligent charger control circuit

Abstract

The utility model provides an intelligent charger control circuit, and belongs to the technical field of charging control. The intelligent charger control circuit comprises a voltage reduction module, a charging control module, a rectification filtering module, a charging protection module and a voltage detection module. The input end of the step-down module is connected with commercial power, the first output end of the step-down module is connected with the input end of the charging control module, the output end of the charging control module is connected with the first input end of the rectification filtering module, and the second output end of the step-down module is connected with the second input end of the rectification filtering module. The output end of the rectification filtering module is connected with the input end of the charging protection module. The output end of the charging protection module is used for connecting a storage battery. The input end of the voltage detection module is connected with the output end of the charging protection module, and the output end of the voltage detection module is connected with the control end of the charging protection module. According to the invention, the safety problem of a special charger mixed battery can be solved.

Description

Technical Field

[0001] This application relates to the technical field of charging control, and particularly to an intelligent charger control circuit. Background Art

[0002] With the maturity of lithium battery technology and the reduction of costs, low-speed electric vehicle manufacturers and users, in order to improve the competitiveness and endurance of their products, have considered replacing lead-acid batteries with lithium batteries. However, whether it is vehicle manufacturers or end-users, when replacing batteries, they often ignore the compatibility issue of chargers and often directly use lead-acid chargers to charge lithium batteries.

[0003] Currently, most chargers on the market are dedicated to single types of batteries. This is because there are significant differences between lead-acid batteries and lithium batteries in terms of electrochemical characteristics, charging and discharging characteristics, and curves, etc., resulting in the need for targeted design in terms of principle circuits, device parameters, etc. of the charger. When a dedicated charger is used to charge a mixed battery pack, its functional parameters and software operation mode cannot match the battery characteristics, which will bring safety and technical risks to the normal use and life of the battery, and even cause damage to the battery pack, affecting user experience and use safety, and there are significant economic losses and fire hazards. Summary of the Utility Model

[0004] An embodiment of this application provides an intelligent charger control circuit to solve the safety problems existing in the use of dedicated chargers for mixed batteries.

[0005] An embodiment of this application provides an intelligent charger control circuit, including: a buck module, a charging control module, a rectification and filtering module, a charging protection module, and a voltage detection module;

[0006] The input end of the buck module is used to connect to the mains power. The first output end of the buck module is connected to the input end of the charging control module. The output end of the charging control module is connected to the first input end of the rectification and filtering module. The second output end of the buck module is connected to the second input end of the rectification and filtering module. The output end of the rectification and filtering module is connected to the input end of the charging protection module. The output end of the charging protection module is used to connect to the storage battery;

[0007] The input end of the voltage detection module is connected to the output end of the charging protection module. The output end of the voltage detection module is connected to the control end of the charging protection module;

[0008] The output end of the voltage detection module and the control end of the charging control module are both used to connect to the control module.

[0009] In an exemplary embodiment of this application, the buck module includes: transformer T1; the rectification and filtering module includes: diode D1, diode D2, capacitor C3, and inductor L1;

[0010] The first input terminal and the second input terminal of the transformer T1 are used to connect to the mains power supply. The first output terminal of the transformer T1 is connected to the input terminal of the charging control module. The second output terminal of the transformer T1 is grounded. The third output terminal of the transformer T1 is connected to the anode of the diode D2;

[0011] The anode of the diode D1 is connected to the output terminal of the charging control module. The cathode of the diode D1 is grounded through the capacitor C3. The cathode of the diode D2 is connected to the cathode of the diode D1;

[0012] The cathode of the diode D1 is connected to the input terminal of the charging protection module through the inductor L1.

[0013] In an exemplary embodiment of the present application, the charging control module includes: a resistor R6 and multiple charging control branches with the same circuit structure. The multiple charging control branches are connected in parallel;

[0014] Any one of the charging control branches includes: a triode Q2 and a capacitor C12;

[0015] The base of the triode Q2 is used to connect to the control module. The collector of the triode Q2 is connected to the first output terminal of the buck module. The emitter of the triode Q2 is connected to the first input terminal of the rectification and filtering module through the capacitor C12;

[0016] The resistor R6 is connected in parallel with the multiple charging control branches.

[0017] In an exemplary embodiment of the present application, the charging protection module includes: a relay K1 and a triode Q1;

[0018] The base of the triode Q1 is connected to the output terminal of the voltage detection module. The collector of the triode Q1 is connected to the 12V power supply. The emitter of the triode Q1 is connected to the first end of the relay K1. The second end of the relay K1 is grounded. The third end of the relay K1 is connected to the output terminal of the rectification and filtering module. The fourth end of the relay K1 is used to connect to the positive electrode of the storage battery, and the negative electrode of the storage battery is grounded.

[0019] In an exemplary embodiment of the present application, the charging protection module further includes: an operational amplifier U4;

[0020] The inverting input terminal of the operational amplifier U4 is connected to the output terminal of the voltage detection module. The non-inverting input terminal of the operational amplifier U4 is connected to the Vref reference voltage. The output terminal of the operational amplifier U4 is connected to the base of the triode Q1.

[0021] In an exemplary embodiment of the present application, the voltage detection module includes: a sliding resistor RP1, a resistor R8, a triode Q4, and a resistor R9;

[0022] The first end of the sliding resistor RP1 is connected to the output end of the charging protection module, the second end of the sliding resistor RP1 is grounded, the sliding end of the sliding resistor RP1 is connected to the base of the triode Q4, the collector of the triode Q4 is connected to a 5V power supply, the emitter of the triode Q4 is grounded through the resistor R9, and the emitter of the triode Q4 is respectively used to connect to the control module and the control end of the charging protection module.

[0023] In an exemplary embodiment of the present application, the voltage detection module further includes: an optocoupler U3;

[0024] The first end of the optocoupler U3 is connected to the sliding end of the sliding resistor RP1, the second end of the optocoupler U3 is grounded, the third end of the optocoupler U3 is connected to a 5V power supply, and the fourth end of the optocoupler U3 is connected to the base of the triode Q4.

[0025] The beneficial effects of the intelligent charger control circuit provided by the embodiments of the present application are as follows: The charger control circuit of the present application integrates modules such as step-down, charging control, rectification and filtering, charging protection, and current and voltage detection, realizing compatible charging for lead-acid and lithium batteries. The voltage detection module monitors the battery voltage and current in real time, and feeds back the signal to the control module and the charging protection module. The control module controls the charging control module to adjust the charging current and voltage accordingly. When the battery is not fully charged, the charging protection module keeps the charging circuit conducting, and automatically cuts off when it is full, avoiding overcharging. The present application solves the safety and technical risks existing in the mixed use of batteries by dedicated chargers, reduces the procurement cost of chargers for vehicle manufacturers, users can flexibly select battery types, and ensures the normal use and lifespan of the batteries. Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 is a schematic structural diagram of an intelligent charger control circuit provided by an embodiment of the present application;

[0028] Figure 2 is a circuit diagram of an intelligent charger control circuit provided by an embodiment of the present application;

[0029] Figure 3It is the circuit diagram of the charging control module provided by the embodiment of the present application. Specific embodiments

[0030] In order to enable those skilled in the art to better understand this solution, the technical solutions in the embodiments of this solution will be clearly described below in conjunction with the accompanying drawings in the embodiments of this solution. Obviously, the described embodiments are part of the embodiments of this solution, rather than all of the embodiments. Based on the embodiments in this solution, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the scope of protection of this solution.

[0031] The terms "including" and any other variations in the description and claims of this solution and the above-mentioned accompanying drawings mean "including but not limited to", intending to cover non-exclusive inclusion, and are not limited to the examples listed in the text. In addition, terms such as "first" and "second" are used to distinguish different objects, rather than to describe a specific order.

[0032] The implementation of the present application will be described in detail below in conjunction with specific accompanying drawings. In the drawings, A1A2 is a connection identifier, Figure 3 is Figure 2 the expansion of the A1A2 area in

[0033] Figure 1 It is the structural schematic diagram of an intelligent charger control circuit provided by the embodiment of the present application. Referring to Figure 1 , the intelligent charger control circuit includes: a buck module, a charging control module, a rectification and filtering module, a charging protection module, and a voltage detection module;

[0034] The input end of the buck module is used to connect to the mains power. The first output end of the buck module is connected to the input end of the charging control module. The output end of the charging control module is connected to the first input end of the rectification and filtering module. The second output end of the buck module is connected to the second input end of the rectification and filtering module. The output end of the rectification and filtering module is connected to the input end of the charging protection module. The output end of the charging protection module is used to connect to the storage battery;

[0035] The input end of the voltage detection module is connected to the output end of the charging protection module. The output end of the voltage detection module is connected to the control end of the charging protection module;

[0036] The output end of the voltage detection module and the control end of the charging control module are both used to connect to the control module.

[0037] In practical applications, the electrochemical characteristics of lead-acid batteries and lithium batteries are different. Therefore, in the case where lead-acid batteries and lithium batteries cannot be distinguished, it is necessary to select appropriate charging current and voltage according to the current, voltage, and time conditions of the battery to be charged. The charging control module automatically sets the charging termination voltage. In this embodiment, the charging control module automatically sets the charging termination voltage according to the charging current, voltage, and time of the battery.

[0038] In this embodiment, the charging control module receives the voltage at the first output terminal of the buck module, and its output terminal is connected to the first input terminal of the rectifying and filtering module. Due to the different electrochemical characteristics of lead-acid batteries and lithium batteries, in the case where the two types of batteries cannot be distinguished, the charging control module needs to select appropriate charging current and voltage according to the current and voltage conditions of the battery to be charged. The voltage detection module can send the detection results of the current, voltage, and time of the battery to be charged to the control terminal of the charging control module. Based on this detection result and under the action of the control signal output by the control module, the charging control module selects an appropriate charging termination voltage.

[0039] The rectifying and filtering module receives the voltages from the second output terminal of the buck module and the output terminal of the charging control module, converts the alternating current into direct current, and performs filtering processing, and outputs a relatively stable direct current voltage to the charging protection module.

[0040] The input terminal of the charging protection module is connected to the output terminal of the rectifying and filtering module, and the output terminal is connected to the battery. When the battery is not fully charged, the switch inside the charging protection module is closed, and the direct current voltage output by the rectifying and filtering module can continuously charge the battery; when the battery is fully charged, the voltage detection module outputs a corresponding electrical signal to the control terminal of the charging protection module, and the switch inside the charging protection module is disconnected, cutting off the charging circuit of the battery to prevent overcharging from damaging the battery.

[0041] The input terminal of the voltage detection module is connected to the output terminal of the charging protection module, and it continuously detects the voltage across the battery. Its output terminals are respectively connected to the control terminal and the control module of the charging protection module, feeds back the detected voltage signal to the control module, and the control module outputs a corresponding control signal to the charging control module according to this signal. The charging control module selects an appropriate capacitive voltage reduction method to adjust the charging current; at the same time, when it detects that the battery is fully charged, it outputs a signal to the charging protection module to cut off the charging circuit.

[0042] In this embodiment, the charger control circuit of the present application integrates modules such as buck, charging control, rectification and filtering, charging protection, and current and voltage detection to achieve compatible charging for lead-acid and lithium batteries. The voltage detection module monitors the battery voltage in real time and feeds the signal back to the control module and the charging protection module. The control module controls the charging control module to adjust the charging current accordingly. When the battery is not fully charged, the charging protection module keeps the charging circuit conducting, and automatically cuts off when it is fully charged to avoid overcharging. The present application solves the safety and technical risks existing in the mixed use of batteries by dedicated chargers, reduces the procurement cost of chargers for vehicle manufacturers, allows users to flexibly select battery types, and ensures the normal use and lifespan of the batteries.

[0043] As Figure 2 shown, further, the buck module includes: transformer T1; the rectification and filtering module includes: diodes D1, D2, capacitor C3, and inductor L1;

[0044] The first input terminal and the second input terminal of transformer T1 are used to connect to the mains power supply. The first output terminal of transformer T1 is connected to the input terminal of the charging control module. The second output terminal of transformer T1 is grounded. The third output terminal of transformer T1 is connected to the anode of diode D2;

[0045] The anode of diode D1 is connected to the output terminal of the charging control module. The cathode of diode D1 is grounded through capacitor C3. The cathode of diode D2 is connected to the cathode of diode D1;

[0046] The cathode of diode D1 is connected to the input terminal of the charging protection module through inductor L1.

[0047] In this embodiment, transformer T1 is used to convert the high voltage of the mains power supply (200V AC) into a low voltage suitable for subsequent circuit processing. Among them, the first output terminal is connected to the input terminal of the charging control module to provide a suitable input voltage for the charging control module; the second output terminal is grounded to provide a reference potential for the circuit; the third output terminal is connected to the anode of diode D2 to provide another input voltage for the rectification and filtering module.

[0048] Diodes D1 and D2 form a rectification circuit to convert alternating current into direct current. The alternating current signal output from the charging control module is rectified by diode D1, and the alternating current signal output from the third output terminal of transformer T1 is rectified by diode D2. The direction of the rectified current is unified to form a pulsating direct current.

[0049] The capacitor C3 and the inductor L1 form a filtering circuit. The capacitor C3 is used to smooth the voltage fluctuation. When the voltage rises, the capacitor C3 charges and stores energy; when the voltage drops, the capacitor C3 discharges and releases energy, thereby reducing the amplitude of the voltage fluctuation. The inductor L1 has the characteristic of hindering the change of current and can further smooth the current, making the output direct current more stable. After rectification and filtering, the output direct current voltage can provide a stable charging power supply for the storage battery.

[0050] As Figure 2 - Figure 3 shown, further, the charging control module includes: a resistor R6 and multiple charging control branches with the same circuit structure, and the multiple charging control branches are connected in parallel; any one of the charging control branches includes: a triode Q2 and a capacitor C12; the base of the triode Q2 is used to connect to the control module, the collector of the triode Q2 is connected to the first output end of the buck module, and the emitter of the triode Q2 is connected to the first input end of the rectification and filtering module through the capacitor C12; the resistor R6 is connected in parallel with the multiple charging control branches.

[0051] In this embodiment, the control module determines the conduction condition of the triode in the charging control branch according to the voltage signal output by the voltage detection module. Since the capacitance values of the capacitors in each charging control branch are different, when different branches are conducted, different capacitance values can be combined to form different resistor-capacitor buck circuits together with the resistor R6.

[0052] Specifically, capacitor bucking uses the capacitive reactance generated by the capacitor at the AC signal frequency to limit the maximum working current in the circuit. After the mains voltage is stepped down by the transformer T1 in the buck module, the output AC voltage reaches the charging control module. When the control module controls a certain triode Q2 or some triodes Q2 to conduct, the capacitor C12 in the corresponding branch is connected to the circuit, and together with the resistor R6, further bucking processing is performed on the stepped-down voltage. By controlling the combination access of capacitors with different capacitance values, the voltage output to the rectification and filtering module can be flexibly adjusted according to the voltage condition of the storage battery to be charged, so as to achieve adaptive charging for different types of batteries (such as lead-acid batteries and lithium batteries) and meet the current requirements of different batteries during charging.

[0053] As Figure 2 shown, further, the charging protection module includes: a relay K1 and a triode Q1;

[0054] The base of the triode Q1 is connected to the output end of the voltage detection module, the collector of the triode Q1 is connected to the 12V power supply, the emitter of the triode Q1 is connected to the first end of the relay K1, the second end of the relay K1 is grounded, the third end of the relay K1 is connected to the output end of the rectification and filtering module, and the fourth end of the relay K1 is used to connect to the positive electrode of the storage battery, and the negative electrode of the storage battery is grounded.

[0055] In this embodiment, during normal charging, when the voltage detection module monitors that the storage battery is not fully charged, it outputs an electrical signal to make the base of the triode Q1 obtain sufficient voltage, thereby turning on the triode Q1. At this time, a path is formed between the emitter and the collector of the triode Q1, and the current flows from the 12V power supply through the collector and emitter of the triode Q1 to the first end of the relay K1, and then through the second end of the relay K1 to the ground, forming a loop. This makes the coil of the relay K1 energized to generate a magnetic field, and further makes the third end and the fourth end of the relay K1 connected, and the DC voltage output by the rectification and filtering module can charge the storage battery through the relay K1.

[0056] When the storage battery is fully charged, the voltage detection module detects the corresponding voltage change, and the output electrical signal changes, so that the base voltage of the triode Q1 is not sufficient to maintain its conduction state, and the triode Q1 is cut off. At this time, there is no current passing through the coil of the relay K1, the magnetic field disappears, and the third end and the fourth end of the relay K1 are disconnected, thereby cutting off the charging circuit of the storage battery, preventing the overcharging of the storage battery, playing a role in protecting the storage battery, prolonging its service life, and at the same time improving the safety of the charging process.

[0057] As Figure 2 shown, further, the charging protection module further includes: an operational amplifier U4;

[0058] The inverting input terminal of the operational amplifier U4 is connected to the output terminal of the voltage detection module, the non-inverting input terminal of the operational amplifier U4 is connected to the Vref reference voltage, and the output terminal of the operational amplifier U4 is connected to the base of the triode Q1.

[0059] In this embodiment, the operational amplifier U4 works as a voltage comparator. When the voltage output by the voltage detection module is lower than the Vref reference voltage, the operational amplifier U4 outputs a high-level signal; when the voltage output by the voltage detection module is higher than the Vref reference voltage, the operational amplifier U4 outputs a low-level signal.

[0060] The output terminal of the operational amplifier U4 is connected to the base of the triode Q1. When the operational amplifier U4 outputs a high-level signal, the triode Q1 obtains sufficient base current and turns on. At this time, the first end of the relay K1 is connected to the emitter. Since the collector is connected to the 12V power supply, there is current passing through the coil of the relay K1, generating a magnetic field, making the third end and the fourth end of the relay K1 connected, and the charging circuit works normally, and the storage battery is charged. When the operational amplifier U4 outputs a low-level signal, the base current of the triode Q1 is cut off and it is cut off. There is no current in the coil of the relay K1, and its third end and fourth end are disconnected, stopping charging the storage battery, thereby realizing the precise control of the on-off of the charging circuit according to the charging state of the storage battery, and playing a role in protecting the storage battery.

[0061] As Figure 2As shown in the figure, further, the voltage detection module includes: a sliding resistor RP1, a resistor R8, a triode Q4, and a resistor R9; the first end of the sliding resistor RP1 is connected to the output end of the charging protection module, the second end of the sliding resistor RP1 is grounded, the sliding end of the sliding resistor RP1 is connected to the base of the triode Q4, the collector of the triode Q4 is connected to the 5V power supply, the emitter of the triode Q4 is grounded through the resistor R9, and the emitter of the triode Q4 is respectively used to connect to the control module and the control end of the charging protection module.

[0062] In this embodiment, the sliding resistor RP1 and the storage battery form a series voltage-dividing circuit. By adjusting the position of the sliding end of the sliding resistor RP1, the voltage output by the sliding end can be changed. This voltage serves as the base input signal of the triode Q4.

[0063] The triode Q4 operates in the amplification state, its collector is connected to the 5V power supply, and its emitter is grounded through the resistor R9. When the base voltage changes, the base current of the triode Q4 will change accordingly. Due to the amplification effect of the triode, the collector current will also change, thereby causing the emitter current to change. The emitter current generates a voltage drop across the resistor R9. According to Ohm's law, the voltage magnitude across the resistor R9 is proportional to the emitter current.

[0064] By detecting the voltage magnitude across the resistor R9, the voltage magnitude of the storage battery can be indirectly judged. Because the change in the storage battery voltage will cause the change in the voltage output by the sliding end of the sliding resistor RP1, which in turn leads to the change in the emitter current of the triode Q4, and finally is reflected in the voltage of the resistor R9. By monitoring the voltage across the resistor R9, the control module and the control end of the charging protection module can obtain the voltage information of the storage battery, thereby realizing the control and protection of the charging process. For example, when the storage battery voltage reaches the set full charge threshold, the charging protection module can cut off the charging circuit according to this signal.

[0065] As Figure 2 As shown in the figure, further, the voltage detection module further includes: an optocoupler U3; the first end of the optocoupler U3 is connected to the sliding end of the sliding resistor RP1, the second end of the optocoupler U3 is grounded, the third end of the optocoupler U3 is connected to the 5V power supply, and the fourth end of the optocoupler U3 is connected to the base of the triode Q4.

[0066] In this embodiment, the important role of the optocoupler is to achieve electrical isolation. In the charging circuit, the voltage at the output end of the charging protection module may have large fluctuations and interferences. If the voltage signal is directly transmitted to the base of the triode Q4, it will affect the stability and accuracy of the circuit. Through isolation by the optocoupler U3, the interference signals in the charging circuit can be effectively avoided from affecting the control circuit, improving the anti-interference ability and reliability of the system.

[0067] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An intelligent charger control circuit, characterized in that, It includes: a step-down module, a charging control module, a rectifying and filtering module, a charging protection module, and a voltage detection module; The input end of the step-down module is used to connect to the mains power. The first output end of the step-down module is connected to the input end of the charging control module. The output end of the charging control module is connected to the first input end of the rectifying and filtering module. The second output end of the step-down module is connected to the second input end of the rectifying and filtering module. The output end of the rectifying and filtering module is connected to the input end of the charging protection module. The output end of the charging protection module is used to connect to a storage battery; The input end of the voltage detection module is connected to the output end of the charging protection module. The output end of the voltage detection module is connected to the control end of the charging protection module; The output end of the voltage detection module and the control end of the charging control module are both used to connect to a control module.

2. The intelligent charger control circuit according to claim 1, wherein The step-down module includes: a transformer T1; the rectifying and filtering module includes: a diode D1, a diode D2, a capacitor C3, and an inductor L1; The first input end and the second input end of the transformer T1 are used to connect to the mains power. The first output end of the transformer T1 is connected to the input end of the charging control module. The second output end of the transformer T1 is grounded. The third output end of the transformer T1 is connected to the anode of the diode D2; The anode of the diode D1 is connected to the output end of the charging control module. The cathode of the diode D1 is grounded through the capacitor C3. The cathode of the diode D2 is connected to the cathode of the diode D1; The cathode of the diode D1 is connected to the input end of the charging protection module through the inductor L1.

3. The intelligent charger control circuit according to claim 1, wherein The charging control module includes: a resistor R6 and multiple charging control branches with the same circuit structure. The multiple charging control branches are connected in parallel; Any one of the charging control branches includes: a triode Q2 and a capacitor C12; The base of the triode Q2 is used to connect to the control module. The collector of the triode Q2 is connected to the first output end of the step-down module. The emitter of the triode Q2 is connected to the first input end of the rectifying and filtering module through the capacitor C12. The resistor R6 is connected in parallel with the multiple charging control branches.

4. The intelligent charger control circuit according to claim 1, characterized in that, The charging protection module includes: a relay K1 and a triode Q1; The base of the triode Q1 is connected to the output end of the voltage detection module. The collector of the triode Q1 is connected to a 12V power supply. The emitter of the triode Q1 is connected to the first end of the relay K1. The second end of the relay K1 is grounded. The third end of the relay K1 is connected to the output end of the rectifying and filtering module. The fourth end of the relay K1 is used to connect to the positive pole of the storage battery. The negative pole of the storage battery is grounded.

5. The intelligent charger control circuit according to claim 4, wherein The charging protection module further includes: an operational amplifier U4; The inverting input end of the operational amplifier U4 is connected to the output end of the voltage detection module. The non-inverting input end of the operational amplifier U4 is connected to the Vref reference voltage. The output end of the operational amplifier U4 is connected to the base of the triode Q1.

6. The intelligent charger control circuit according to claim 1, characterized in that The voltage detection module includes: a sliding resistor RP1, a resistor R8, a triode Q4, and a resistor R9; The first end of the sliding resistor RP1 is connected to the output end of the charging protection module, the second end of the sliding resistor RP1 is grounded, the sliding end of the sliding resistor RP1 is connected to the base of the triode Q4, the collector of the triode Q4 is connected to the 5V power supply, the emitter of the triode Q4 is grounded through the resistor R9, and the emitter of the triode Q4 is respectively used to connect the control module and the control end of the charging protection module.

7. The intelligent charger control circuit according to claim 6, wherein, The voltage detection module further includes: an optocoupler U3; The first end of the optocoupler U3 is connected to the sliding end of the sliding resistor RP1, the second end of the optocoupler U3 is grounded, the third end of the optocoupler U3 is connected to the 5V power supply, and the fourth end of the optocoupler U3 is connected to the base of the triode Q4.

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