A lead-acid battery charging detection circuit

Abstract

This invention relates to the field of electronic circuit technology and discloses a lead-acid battery charging detection circuit. The method includes: a charging management chip module; a main control chip module for controlling the on / off state of a power supply control module based on a level signal output from a charging status feedback module; a power input module for connecting an external power supply; a power output module for connecting an external lead-acid battery; a power supply control module for controlling the power supply output; a controlled switch module for controlling the power supply output to the lead-acid battery when on; a charging status feedback module for outputting a low-level signal to the main control chip module when the lead-acid battery is fully charged; and a charging detection module for setting the charging current. Implementing this invention can meet energy efficiency certification requirements while reducing the occurrence of circuit failures.

Description

Technical Field

[0001] This invention relates to the field of electronic circuit technology, and in particular to a lead-acid battery charging detection circuit. Background Technology

[0002] Currently, in existing lead-acid battery charging detection circuits, the charging current gradually decreases in overcharge mode. When the charging current decreases to 38% of the constant current charging current (1A x 0.38 = 380mA), overcharging ends, and the charger enters float charging mode. In float charging mode, the voltage at the BAT pin is modulated at 91.57% of the overcharge voltage (VOC), typically 13.55V. While float charging mode can compensate for battery energy loss due to self-discharge or load, it also results in a persistent loss current of approximately 60mA for the charging management chip. This prevents the chip from completely shutting down after full charging, thus failing CEC energy efficiency certification. Furthermore, in existing lead-acid battery charging detection circuits, if... Figure 1 As shown, most charging detection resistors are both charging current setting resistors and load current path resistors for the entire device. The operating current of the entire device is applied to the charging detection resistor, which makes the current across the charging detection resistor very large when the power amplifier is working. When the current across the charging detection resistor is too large, it will instantly generate severe heat and smoke, open flame, and cause an accident. Summary of the Invention

[0003] This invention discloses a lead-acid battery charging detection circuit that can meet energy efficiency certification requirements while reducing the occurrence of circuit failures.

[0004] The first aspect of this invention discloses a lead-acid battery charging detection circuit, comprising:

[0005] The system comprises: a charging management chip module 1; a main control chip module 2 for controlling the power supply control module to switch on and off based on the level signal output by the charging status feedback module 7; a power input terminal module for connecting an external power supply; a power output terminal module for connecting an external lead-acid battery; a power supply control module for controlling the power supply output; a controlled switch module for controlling the power supply output to the lead-acid battery when it is on; a charging status feedback module 7 for turning on when the lead-acid battery is fully charged to output a low-level signal to the charging status feedback module in the main control chip module 2; and a charging detection module 8 for setting the charging current.

[0006] The power input module 3, the power supply control module 5, the controlled switch module 6, the charging detection module 8, and the power output module 4 are connected in sequence. The control signal output terminal of the charging management chip module 1 is electrically connected to the control signal input terminal of the controlled switch module 6 and the control signal input terminal of the charging status feedback module 7, respectively. The power signal input terminal of the charging management chip module 1 is electrically connected to the power signal output terminal of the power supply control module 5. The signal input terminal of the charging management chip module 1 is electrically connected to the signal output terminal of the charging detection module 8. The control signal output terminal of the main control chip module 2 is electrically connected to the control signal input terminal of the power supply control module 5.

[0007] In the embodiments, preferably:

[0008] The power supply control module 5 includes a PMOS transistor Q26 for controlling the power supply output and an NPN transistor Q7 for controlling the switching on and off of the PMOS transistor Q26. The base of the NPN transistor Q7 is electrically connected to the control signal output terminal of the main control chip module 2 through a resistor R141. The collector of the NPN transistor Q7 is electrically connected to the gate of the PMOS transistor Q26 through a resistor R162. The emitter of the NPN transistor Q7 is grounded. The source of the PMOS transistor Q26 is electrically connected to the power signal output terminal of the power input terminal module 3. The drain of the PMOS transistor Q26 is electrically connected to the power signal input terminal of the charging management chip module 1 and the power signal input terminal of the controlled switch module 6, respectively. A resistor R58 is electrically connected between the drains of the PMOS transistor Q26.

[0009] In the embodiments, preferably:

[0010] The controlled switch module 6 includes a PMOS transistor Q11 for controlling the power supply output to the lead-acid battery when it is turned on, a choke diode D18 for preventing reverse current flow from the lead-acid battery, and a freewheeling diode D19 for providing a power dissipation path for the reverse electromotive force when the PMOS transistor Q11 is turned off. The gate of the PMOS transistor Q11 is electrically connected to the control signal output terminal of the charging management chip module 1 through a resistor R97. The source of the PMOS transistor Q11 is electrically connected to the power signal output terminal of the power supply control module 5. The drain of the PMOS transistor Q11 is electrically connected to the anode of the choke diode D18. The cathode of the choke diode D18 is electrically connected to the power signal input terminal of the charging detection module 8 through an inductor L26. The freewheeling diode D19 is connected in parallel between the choke diode D18 and the inductor L26, and the anode of the freewheeling diode D19 is grounded.

[0011] In the embodiments, preferably:

[0012] The charging status feedback module 7 includes an NPN transistor Q2 that is turned on when the lead-acid battery is fully charged to output a low-level signal to the main control chip module 2. The base of the NPN transistor Q2 is electrically connected to the control signal output terminal of the charging management chip module 1 through a resistor R173. The collector of the NPN transistor Q2 is electrically connected to the signal input terminal of the main control chip module 2. The emitter of the NPN transistor Q2 is grounded.

[0013] In the embodiments, preferably:

[0014] The charging detection module 8 includes a resistor R98 for setting the charging current. The resistor R98 is electrically connected between the power signal output terminal of the controlled switch module 6 and the power signal input terminal of the power output terminal module 4. The signal input terminal of the charging management chip module 1 is electrically connected to both ends of the resistor R98.

[0015] In the embodiments, preferably:

[0016] The resistor R98 is a surface-mount carbon film resistor.

[0017] A second aspect of this invention discloses a lead-acid battery charging detection system, the lead-acid battery charging detection system comprising:

[0018] Memory containing executable program code;

[0019] A processor coupled to the memory;

[0020] The processor calls the executable program code stored in the memory to execute a lead-acid battery charging detection circuit disclosed in the first aspect of the present invention.

[0021] A fourth aspect of the present invention discloses a computer-readable storage medium storing a computer program, wherein the computer program causes a computer to execute a lead-acid battery charging detection circuit disclosed in the first aspect of the present invention.

[0022] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0023] 1. It can meet energy efficiency certification requirements while reducing the occurrence of circuit failures.

[0024] 2. It can solve the problem of open flame accidents when the product is in use with a large current. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of a lead-acid battery charging detection circuit in existing technology;

[0027] Figure 2 This is a schematic diagram of a lead-acid battery charging detection circuit disclosed in an embodiment of the present invention;

[0028] Figure 3 This is an electrical schematic diagram of a lead-acid battery charging detection circuit disclosed in an embodiment of the present invention. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] It should be noted that the terms "first," "second," "third," "fourth," etc., used in the specification and claims of this invention are used to distinguish different objects, not to describe a specific order. The terms "comprising" and "having," and any variations thereof, in the embodiments of this invention are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products, or devices.

[0031] This invention discloses a lead-acid battery charging detection circuit that can meet energy efficiency certification requirements while reducing the occurrence of circuit failures.

[0032] The following is a detailed description in conjunction with the accompanying drawings.

[0033] Example 1

[0034] Please see Figure 2 , Figure 2 This is a schematic block diagram of a lead-acid battery charging detection circuit disclosed in an embodiment of the present invention. Figure 2 As shown, the lead-acid battery charging detection circuit includes:

[0035] The charging management chip module 1 is a main control chip module used to control the power supply control module to turn on and off based on the level signal output by the charging status feedback module 7. The main control chip module 2 is a power input terminal module for external power supply. The main control chip module 3 is a power output terminal module for external lead-acid battery. The main control chip module 4 is a power supply control module for controlling the power supply output. The main control chip module 5 is a controlled switch module for controlling the power supply output to the lead-acid battery when it is turned on. The main control chip module 6 is a charging status feedback module for turning on when the lead-acid battery is fully charged to output a low level signal to the main control chip module 2. The main control chip module 7 is a charging detection module for setting the charging current.

[0036] The power input module 3, power supply control module 5, controlled switch module 6, charging detection module 8, and power output module 4 are connected in sequence. The control signal output terminal of the charging management chip module 1 is electrically connected to the control signal input terminal of the controlled switch module 6 and the control signal input terminal of the charging status feedback module 7, respectively. The power signal input terminal of the charging management chip module 1 is electrically connected to the power signal output terminal of the power supply control module 5. The signal input terminal of the charging management chip module 1 is electrically connected to the signal output terminal of the charging detection module 8. The control signal output terminal of the main control chip module 2 is electrically connected to the control signal input terminal of the power supply control module 5.

[0037] In this embodiment, addressing the issue that existing charging management chips do not completely stop working after being fully charged, thus failing CEC energy efficiency certification, this application adds a power supply control module 5 to the power input terminal of the charging management chip module 1. When the power supply is providing power, the control signal output terminal of the main control chip module 2 can output a high level to the power supply control module 5, causing the power supply control module 5 to conduct, thus allowing the power supply to be connected to the VCC terminal of the charging management chip module 1 to power the charging management chip module 1. The CHRG terminal of the charging management chip module 1 is the charging status indicator terminal. In trickle, constant current, and overcharge states, the internal transistor of the charging management chip module 1 can pull this pin low. When the battery voltage is charged to a specified level... When the voltage is at a certain value, this pin is in a high-impedance state. Since a pull-up resistor CHRG is connected to this pin, a high-level signal is generated and sent to the charging status feedback module 7, causing the charging status feedback module 7 to conduct and output a low-level signal to the main control chip module 2. After receiving the low-level signal, the main control chip module 2 can start timing. After a 30-minute delay, the main control chip module 2 can determine again whether the lead-acid battery is fully charged. If so, the main control chip module 2 can output a low-level signal to the power supply control module 5, causing the power supply control module 5 to be cut off, thereby disconnecting the power supply output to the VCC pin of the charging management chip module 1, so that the charging management chip module 1 completely stops working and generates no power consumption, thus passing the CEC energy efficiency certification.

[0038] In this embodiment, the charging detection module 8 used in the prior art is directly connected to the negative terminal of the battery. This results in a large current flowing through the charging detection module 8 during discharge, requiring a high power output to withstand it; otherwise, an open flame may occur, leading to an accident. However, the charging detection module 8 in this application only sets the charging current. The overall operating current of the device does not pass through the charging detection module 8. Therefore, the maximum current flowing through the charging detection module 8 is the charging current. Consequently, the charging detection module 8 does not require a large power output, and in charging mode, it can fully withstand the charging current of the circuit without overheating, emitting smoke, or causing an open flame.

[0039] In this embodiment, since the operating current of the entire device does not pass through the charging detection module 8, when the lead-acid battery experiences a short circuit or a large current due to reverse polarity, the battery fuse will blow, and the battery will have no output. The charging detection module 8 will be protected and will not be damaged. When the entire device operates at a full load of 2.5A, since the operating current does not pass through the charging detection module 8, the current across the charging detection module 8 remains the charging current. Therefore, the charging detection module 8 will not experience a large current flow, thus preventing overheating, smoke, or even an open flame.

[0040] In this embodiment, the charging management chip module 1 of this application can be used for the charging management of the entire battery, and is responsible for stabilizing the entire charging process and outputting the charging status.

[0041] In this embodiment, when the main control chip module 2 receives the charging status feedback sent by the charging status feedback module 7, it can output high and low levels to the power supply control module 5 to control the power supply control module 5 to turn on and off, thereby controlling the power supply output.

[0042] It is evident that implementation Figure 2 The described lead-acid battery charging detection circuit can meet energy efficiency certification requirements while reducing the occurrence of circuit failures.

[0043] Example 2

[0044] Please see Figure 3 , Figure 3 This is an electrical schematic diagram of a lead-acid battery charging detection circuit disclosed in an embodiment of the present invention.

[0045] Please refer to Figure 3 As shown, in an embodiment of the present invention, preferably:

[0046] The power supply control module 5 includes a PMOS transistor Q26 for controlling the power supply output and an NPN transistor Q7 for controlling the switching on and off of the PMOS transistor Q26. The base of the NPN transistor Q7 is electrically connected to the control signal output terminal of the main control chip module 2 through a resistor R141. The collector of the NPN transistor Q7 is electrically connected to the gate of the PMOS transistor Q26 through a resistor R162. The emitter of the NPN transistor Q7 is grounded. The source of the PMOS transistor Q26 is electrically connected to the power signal output terminal of the power input terminal module 3. The drain of the PMOS transistor Q26 is electrically connected to the power signal input terminal of the charging management chip module 1 and the power signal input terminal of the controlled switch module 6, respectively. A resistor R58 is electrically connected between the drains of the PMOS transistor Q26.

[0047] In this embodiment, when the power input module 3 outputs a DC_18V power supply, the BAT_ONOFF pin of the main control chip module 2 can output a high-level signal to the base of the NPN transistor Q7, causing the NPN transistor Q7 to conduct. Subsequently, the emitter potential of the NPN transistor Q7 is pulled low, causing the gate voltage of the PMOS transistor Q26 to be lower than the source voltage, thereby driving the PMOS transistor Q26 to conduct. This allows the DC_18V power supply output by the power input module 3 to be output to the VCC pin of the charging management chip module 1, thereby providing power to the charging management chip module 1.

[0048] Please refer to Figure 3 As shown, in an embodiment of the present invention, preferably:

[0049] The controlled switch module 6 includes a PMOS transistor Q11 for controlling the power supply output to the lead-acid battery when it is turned on, a choke diode D18 for preventing reverse current flow from the lead-acid battery, and a freewheeling diode D19 for providing a power dissipation path for the reverse electromotive force when the PMOS transistor Q11 is turned off. The gate of the PMOS transistor Q11 is electrically connected to the control signal output terminal of the charging management chip module 1 through a resistor R97. The source of the PMOS transistor Q11 is electrically connected to the power signal output terminal of the power supply control module 5. The drain of the PMOS transistor Q11 is electrically connected to the anode of the choke diode D18. The cathode of the choke diode D18 is electrically connected to the power signal input terminal of the charging detection module 8 through an inductor L26. The freewheeling diode D19 is connected in parallel between the choke diode D18 and the inductor L26. The anode of the freewheeling diode D19 is grounded.

[0050] In this embodiment, when the lead-acid battery is not fully charged, the charging management chip module 1 can output a low-level signal to the gate of the PMOS transistor Q11 to turn on the PMOS transistor Q11 at a low level, so that the power supply output from the power input module 3 can be output to the power output module 4. During the conduction of the PMOS transistor Q11, the inductor L26 can store energy. At this time, the inductor L26 is positive on the left and negative on the right, and the freewheeling diode D19 is cut off. When the lead-acid battery is fully charged, the charging management chip module 1 can output a high-level signal to the gate of the PMOS transistor Q11 to turn off the PMOS transistor Q11, thereby stopping the charging operation. During the turn-off of the PMOS transistor Q11, the voltage across the inductor L26 is reversed, becoming negative on the left and positive on the right. At this time, the freewheeling diode D19 is turned on, providing charging current to the battery for the load. At the same time, the choke diode D18 can prevent the battery current from flowing back to the power supply terminal, preventing the consumption of battery energy.

[0051] In this embodiment, during charging, the DRV pin of the charging management chip can provide a PWM pulse signal to the gate of the PMOS transistor Q11 for current adjustment, so that the PMOS transistor Q11 operates in a switching state. After the battery is fully charged, the DRV pin of the charging management chip can turn off the DRV pulse signal and keep it at a high level, so that the PMOS transistor Q11 is turned off and charging stops.

[0052] Please refer to Figure 3 As shown, in an embodiment of the present invention, preferably:

[0053] The charging status feedback module 7 includes an NPN transistor Q2 that is turned on when the lead-acid battery is fully charged to output a low-level signal to the main control chip module 2. The base of the NPN transistor Q2 is electrically connected to the control signal output terminal of the charging management chip module 1 through a resistor R173, the collector of the NPN transistor Q2 is electrically connected to the signal input terminal of the main control chip module 2, and the emitter of the NPN transistor Q2 is grounded.

[0054] In this embodiment, during charging, pin 3 (CHRG) of the charging management chip is at a low level, which causes the NPN transistor Q2 to be in a cutoff state. At this time, the collector of the NPN transistor Q2 is at a high level. After the battery is fully charged, pin 3 (CHRG) of the charging management chip generates a high-level signal because it is connected to a 12K pull-up resistor. This signal is sent to the base of the NPN transistor Q2 through R173, causing the NPN transistor Q2 to conduct at a high level. This pulls down the potential of the collector of the NPN transistor Q2, causing the CHG_STAT pin of the main control chip module 2 to be at a low level and fed back to the main control chip module 2. After receiving a low-level signal, the main control chip module 2 can start timing. After a 30-minute delay, it can determine again whether the lead-acid battery is fully charged. If so, the BAT_ONOFF pin of the main control chip module 2 outputs a low-level signal to the power supply control module 5 to turn off the power supply control module 5, thereby causing the charging management chip's pin 7 VCC to have no voltage supply, completely stopping its operation and generating no power consumption, thus passing the CEC energy efficiency certification.

[0055] Please refer to Figure 3 As shown, in an embodiment of the present invention, preferably:

[0056] The charging detection module 8 includes a resistor R98 for setting the charging current. The resistor R98 is electrically connected between the power signal output terminal of the controlled switch module 6 and the power signal input terminal of the power output terminal module 4. The signal input terminal of the charging management chip module 1 is electrically connected to both ends of the resistor R98.

[0057] Please refer to Figure 3 As shown, in an embodiment of the present invention, preferably:

[0058] Resistor R98 is a surface-mount carbon film resistor.

[0059] In this embodiment, the resistor R98 is not connected in the negative terminal circuit of the lead-acid battery. This avoids the entire load current from flowing from the ground wire through the charging detection resistor R98 to the negative terminal of the lead-acid battery, thus preventing a large current from being generated across R98. In the original solution, the charging detection resistor is connected in the negative terminal circuit of the lead-acid battery, causing the entire operating current to flow through resistor R98. This results in the resistor R98 overheating due to the large current flowing through it, eventually causing it to smoke, burn, and even ignite.

[0060] In this embodiment, as Figure 1As shown, in the prior art, the original resistor R98 is mostly a bulky and expensive through-hole wire-wound 2W resistor. Once a large current burns out, it will emit flames and smoke, and the PCB circuit board connected to it, battery socket, etc. will also burn out. However, the resistor R98 in this application uses a small and inexpensive surface-mount carbon film resistor, which will not emit flames and smoke and is safer than through-hole wire-wound resistors, thus completely solving the accident of open flame when there is a large current during product use.

[0061] It is evident that implementation Figure 3 The described lead-acid battery charging detection circuit can meet energy efficiency certification requirements while reducing the occurrence of circuit failures.

[0062] In addition, implementation Figure 3 The delay system described can reduce circuit manufacturing costs.

[0063] In addition, implementation Figure 3 The described delay system can improve the safety of circuit use.

[0064] This invention discloses a computer-readable storage medium storing a computer program, wherein the computer program causes a computer to execute... Figures 1-2 Any type of lead-acid battery charging detection circuit.

[0065] This invention also discloses a computer program product, wherein when the computer program product is run on a computer, the computer performs some or all of the steps of the methods described in the above method embodiments.

[0066] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be implemented by a program instructing related hardware. This program can be stored in a computer-readable storage medium, including read-only memory (ROM), random access memory (RAM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), one-time programmable read-only memory (OTPROM), electrically-erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, disk storage, magnetic tape storage, or any other computer-readable medium capable of carrying or storing data.

[0067] The foregoing has provided a detailed description of a lead-acid battery charging detection circuit disclosed in the embodiments of the present invention. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A lead-acid battery charge detection circuit, characterized by, It includes: The charging management chip module (1), the main control chip module (2) for controlling the on-off of the power supply control module according to the level signal output by the charging state feedback module (7), the power supply input end module (3) for external power supply, the power supply output end module (4) for external lead-acid battery, the power supply control module (5) for controlling the conduction output of the power supply, the controlled switch module (6) for controlling the output of the power supply to the lead-acid battery when conducting, the charging state feedback module (7) in the main control chip module (2) for conducting when the lead-acid battery is fully charged to output a low level signal to the main control chip module (2), the charging detection module (8) for charging current setting; Wherein, the power supply input end module (3), the power supply control module (5), the controlled switch module (6), the charging detection module (8) and the power supply output end module (4) are connected in sequence, the control signal output end of the charging management chip module (1) is electrically connected with the control signal input end of the controlled switch module (6) and the control signal input end of the charging state feedback module (7), the power signal input end of the charging management chip module (1) is electrically connected with the power signal output end of the power supply control module (5), the signal input end of the charging management chip module (1) is electrically connected with the signal output end of the charging detection module (8), and the control signal output end of the main control chip module (2) is electrically connected with the control signal input end of the power supply control module (5); When the power supply supplies power, the control signal output end of the main control chip module (2) outputs high level to the power supply control module (5), so that the power supply control module (5) is turned on, so that the power supply is turned on to the VCC end of the charging management chip module (1) to supply power to the charging management chip module (1), the CHRG end of the charging management chip module (1) is a charging state indication end, in the trickle, constant current and overcharge state, the internal transistor of the charging management chip module (1) can pull the CHRG pin to low level, when the battery voltage is charged to the specified voltage value, the CHRG pin is in high resistance state, the CHRG pin generates a high level to the charging state feedback module (7), so that the charging state feedback module (7) is turned on to output a low level signal feedback to the main control chip module (2), after receiving the low level signal, the main control chip module (2) starts timing, after 30 minutes delay, the main control chip module (2) judges again whether the lead-acid battery is fully charged, if yes, the main control chip module (2) outputs low level signal to the power supply control module (5), so that the power supply control module (5) is cut off, so that the power supply output to the VCC pin of the charging management chip module (1) is disconnected, so that the charging management chip module (1) stops working.

2. The lead-acid battery charging detection circuit according to claim 1, characterized in that: The power supply control module (5) includes a PMOS tube Q26 for controlling the power supply to output and an NPN transistor Q7 for controlling the on-off of the PMOS tube Q26, the base of the NPN transistor Q7 is electrically connected with the control signal output end of the main control chip module (2) through a resistor R141, the collector of the NPN transistor Q7 is electrically connected with the gate of the PMOS tube Q26 through a resistor R162, the emitter of the NPN transistor Q7 is grounded, the source of the PMOS tube Q26 is electrically connected with the power signal output end of the power input end module (3), the drain of the PMOS tube Q26 is electrically connected with the power signal input end of the charge management chip module (1) and the power signal input end of the controlled switch module (6) respectively, and the drain of the PMOS tube Q26 is electrically connected with the drain of the PMOS tube Q26 through a resistor R58.

3. The lead-acid battery charging detection circuit according to claim 1, characterized in that: The controlled switch module (6) includes a PMOS tube Q11 for controlling the power supply to output to the lead-acid battery when turned on, a blocking diode D18 for preventing the current of the lead-acid battery from flowing reversely, and a freewheeling diode D19 for providing a power consumption path for the reverse electromotive force when the PMOS tube Q11 is cut off, the gate of the PMOS tube Q11 is electrically connected with the control signal output end of the charge management chip module (1) through a resistor R97, the source of the PMOS tube Q11 is electrically connected with the power signal output end of the power supply control module (5), the drain of the PMOS tube Q11 is electrically connected with the anode of the blocking diode D18, the cathode of the blocking diode D18 is electrically connected with the power signal input end of the charging detection module (8) through an inductor L26, the freewheeling diode D19 is connected in parallel between the blocking diode D18 and the inductor L26, and the anode of the freewheeling diode D19 is grounded.

4. The lead-acid battery charging detection circuit according to claim 1, characterized in that: The charging state feedback module (7) includes an NPN transistor Q2 for being turned on to output a low-level signal to the main control chip module (2) when the lead-acid battery is fully charged, the base of the NPN transistor Q2 is electrically connected with the control signal output end of the charge management chip module (1) through a resistor R173, the collector of the NPN transistor Q2 is electrically connected with the signal input end of the main control chip module (2), and the emitter of the NPN transistor Q2 is grounded.

5. The lead-acid battery charging detection circuit according to any one of claims 1-4, characterized in that: The charging detection module (8) includes a resistor R98 for setting the charging current, the resistor R98 is electrically connected between the power signal output end of the controlled switch module (6) and the power signal input end of the power output end module (4), and the signal input end of the charge management chip module (1) is electrically connected between the two ends of the resistor R98.

6. The lead-acid battery charge detection circuit of claim 5, wherein: The resistor R98 is a chip carbon film resistor.

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