A charging circuit and a lighting device

Abstract

This application belongs to the field of electronic circuit technology and relates to a charging circuit and lighting device, including a rectifier and filter module, a drive module, and a control module. The rectifier and filter module is connected to the drive module and is used to convert AC power from an external power source into DC power and transmit it to the drive module. The drive module is connected to the control module and is used to regulate the output current according to the DC power and the communication signal received from the control module, and to supply power to the battery through the control module. The control module is connected to the battery and is used to detect the battery's charging state and determine the charging strategy for the battery based on the charging state, and send a communication signal to the drive module based on the charging strategy. The technical solution provided by this application can directly charge the battery, with a large charging current and high charging efficiency, while reducing battery wear and tear and improving battery life.

Description

Technical Field

[0001] This application relates to the field of electronic circuit technology, and more specifically, to a charging circuit and a lighting device. Background Technology

[0002] Flashlights are a common portable lighting device in daily life. The existing charging method involves connecting the power supply to the charging management IC (integrated circuit), which requires two-stage step-down circuits of the power supply and the IC. This results in problems such as low charging current and low charging efficiency. Summary of the Invention

[0003] The technical problem to be solved by the embodiments of this application is the low charging current and low charging efficiency in the prior art.

[0004] To address the aforementioned technical problems, this application provides a charging circuit that employs the following technical solution:

[0005] Rectifier and filter module, driver module, and control module;

[0006] The rectifier and filter module is connected to the drive module and is used to convert AC power from the external power source into DC power and transmit it to the drive module.

[0007] The drive module is connected to the control module and is used to regulate the output current according to the DC power and the communication signal sent by the control module, and to supply power to the battery through the control module.

[0008] The control module is connected to the battery and is used to detect the charging status of the battery, determine the charging strategy for the battery based on the charging status, and send the communication signal to the drive module based on the charging strategy.

[0009] Furthermore, the rectifier and filter module includes a rectifier bridge and a filter capacitor. The rectifier bridge includes a first rectifier input terminal, a second rectifier input terminal, a first rectifier output terminal, and a second rectifier output terminal. The first rectifier input terminal and the second rectifier input terminal are connected to the external power supply. The first rectifier output terminal is connected to the first input terminal of the drive module, and the second rectifier output terminal is connected to the second input terminal of the drive module.

[0010] The first end of the filter capacitor is connected to the first input terminal of the drive module, and the second end of the filter capacitor is connected to the second input terminal of the drive module.

[0011] Furthermore, the drive module includes a transformer, an auxiliary winding circuit, a drive chip, and a secondary winding circuit. The transformer includes a main winding, an auxiliary winding, and a secondary winding. The first end of the main winding is the first input end of the drive module, and the second end of the main winding is connected to the drive chip.

[0012] The first end of the auxiliary winding is connected to the input end of the auxiliary winding circuit, and the second end of the auxiliary winding is connected to the driving chip. The energy stored by the DC current is induced by the internal magnetic field to power the driving chip.

[0013] The first output terminal of the auxiliary winding circuit is connected to the driver chip, and the common connection point between the second output terminal of the auxiliary winding circuit and the second end of the auxiliary winding is the second input terminal of the driver module, which is connected to the driver chip.

[0014] The secondary winding is connected to the secondary winding circuit for coupling the energy of the primary winding and transmitting it to the secondary winding circuit;

[0015] The secondary winding circuit is connected to the control module and is used to transmit the output current to the control module;

[0016] The driving chip is connected to the secondary winding circuit and the control module respectively, and is used to regulate the output current by the voltage signal obtained by acquiring the DC current and the communication signal.

[0017] Furthermore, the secondary winding circuit includes a first capacitor, a first switching transistor, and a sampling resistor, wherein:

[0018] The first terminal of the first capacitor is connected to the first terminal of the secondary winding and the control module, and the second terminal of the first capacitor is connected to the source of the first switching transistor.

[0019] The gate of the first switching transistor is connected to the driving chip, the source of the first switching transistor is connected to the first terminal of the sampling resistor, and the drain of the first switching transistor is connected to the second terminal of the secondary winding.

[0020] The second end of the sampling resistor is connected to the driver chip and the ground terminal.

[0021] Furthermore, the auxiliary winding circuit includes a first diode and a second capacitor, the anode of the first diode is the input terminal of the auxiliary winding circuit, and the common connection point between the cathode of the first diode and the first terminal of the second capacitor is the first output terminal of the auxiliary winding circuit.

[0022] The second terminal of the second capacitor is the second output terminal of the auxiliary winding circuit.

[0023] Furthermore, the control module includes a control chip, a control output circuit, and a voltage divider circuit. The control chip is connected to the driver chip and the voltage divider circuit respectively, and is used to determine the charging state of the battery through the voltage divider circuit, and generate the communication signal according to the charging state and send it to the driver chip.

[0024] The first input terminal of the control output circuit is connected to the first terminal of the driver chip and the second terminal of the secondary winding, respectively. The second input terminal of the control output circuit is connected to the driver chip and is used to turn on or off according to the control signal output by the communication signal. The output terminal of the control output circuit is connected to the first terminal of the voltage divider circuit.

[0025] The first terminal of the voltage divider circuit is connected to the positive terminal of the battery, and the second terminal of the voltage divider circuit is grounded.

[0026] Furthermore, the control output circuit includes a second switch, a first resistor, and a second diode. The drain of the second switch is the first input terminal of the control output circuit, the gate of the second switch is the second input terminal of the control output circuit, and the source of the second switch is the output terminal of the control output circuit.

[0027] The first end of the first resistor is connected to the source of the second switching transistor, and the second end of the first resistor is connected to the anode of the second diode;

[0028] The cathode of the second diode is connected to the gate of the second switching transistor.

[0029] Furthermore, the voltage divider circuit includes a first voltage divider resistor and a second voltage divider resistor, the first end of the first voltage divider resistor is the first end of the voltage divider circuit; the common connection point of the second end of the first voltage divider resistor and the first end of the second voltage divider resistor is connected to the control chip; the second end of the second voltage divider resistor is grounded.

[0030] Furthermore, the charging circuit also includes a third capacitor, the first end of which is connected between the driver chip and the control chip, and the second end of which is grounded to filter out interference signals.

[0031] To address the aforementioned technical problems, this application also provides a lighting device that employs the following technical solution:

[0032] Includes the charging circuit described above.

[0033] Compared with the prior art, the embodiments of this application have the following main advantages:

[0034] The charging circuit provided in this application includes a rectifier and filter module, a drive module, and a control module. The rectifier and filter module is connected to the drive module and is used to convert AC power from an external power source into DC power and transmit it to the drive module. The drive module is connected to the control module and is used to regulate the output current according to the DC power and the communication signal received from the control module, and to supply power to the battery through the control module. The control module is connected to the battery and is used to detect the battery's charging state and determine the charging strategy for the battery based on the charging state, and send a communication signal to the drive module based on the charging strategy. This application adopts a direct charging method, directly charging the battery through the charging circuit, reducing intermediate current loss, and has the advantages of large charging current and high charging efficiency. At the same time, by detecting the battery's charging state through the control module and determining the charging strategy based on the charging state, it can reduce battery wear and improve battery life. Attached Figure Description

[0035] To more clearly illustrate the solutions in this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the framework structure of one embodiment of the charging circuit of this application;

[0037] Figure 2 This is a schematic diagram of the circuit structure of one embodiment of the charging circuit of this application;

[0038] Figure 3 This is a schematic diagram of the structure of the rectifier and filter module of the charging circuit of this application;

[0039] Figure 4 This is a schematic diagram of the drive module of the charging circuit of this application;

[0040] Figure 5 This is a schematic diagram of the control module of the charging circuit of this application. Detailed Implementation

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0042] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0043] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0044] This application provides a charging circuit, see [link to relevant documentation] Figure 1 As shown, it includes a rectifier and filter module 10, a drive module 20, and a control module 30.

[0045] The rectifier and filter module 10 is connected to the drive module 20 and is used to convert the AC power from the external power supply J1 into DC power and transmit it to the drive module 20.

[0046] The external power supply J1 is mains power or AC power, which is connected to the rectifier and filter module 10. The rectifier and filter module 10 converts it into smooth DC power, which is then delivered to the drive module 20 to provide a stable voltage for the subsequent circuits.

[0047] The drive module 20 is connected to the control module 30 and is used to regulate the output current according to the DC current and the communication signal sent by the control module 30, and to supply power to the battery J2 through the control module 30.

[0048] The drive module 20 samples the DC current it receives and compares the sampled voltage with the internal reference voltage to obtain a stable output current. At the same time, the internal reference voltage can be adjusted according to the communication signal of the control module 30, and the output current is obtained after adjustment, thereby realizing the regulation of the output current.

[0049] The control module 30 is connected to the battery J2 to detect the charging status of the battery J2, determine the charging strategy for the battery J2 based on the charging status, and send communication signals to the drive module 20 based on the charging strategy.

[0050] The control module 30 can detect the charging status of the battery J2, which is the power status. When the power status is fully charged, the control module 30 turns off and stops charging; when the power status is not fully charged, it determines the charging current based on the current battery voltage, generates a corresponding communication signal, and transmits it to the drive module 20.

[0051] In this embodiment, during the charging process, the control module 30 monitors the battery charging status and communicates with the drive module 20 to adopt different charging strategies for different battery charging states, so that the battery can obtain excellent charge status and good charging curve, reduce battery wear, protect the battery, and thus improve the battery's service life.

[0052] In this embodiment, see Figure 2 and Figure 3 The rectifier and filter module 10 includes a rectifier bridge BD1 and a filter capacitor C1. The rectifier bridge BD1 includes a first rectifier input terminal N, a second rectifier input terminal L, a first rectifier output terminal V+, and a second rectifier output terminal V-.

[0053] The first rectifier input terminal N and the second rectifier input terminal L are connected to the external power supply J1. Specifically, the first rectifier input terminal N is connected to the neutral wire N of the external power supply J1, and the second rectifier input terminal L is connected to the live wire L of the external power supply J1. The first rectifier output terminal V+ is connected to the first input terminal of the driver module 20, and the second rectifier output terminal V- is connected to the second input terminal of the driver module 20.

[0054] The first end of the filter capacitor C1 is connected to the first input terminal of the drive module 20, and the second end of the filter capacitor C1 is connected to the second input terminal of the drive module 20.

[0055] The filter capacitor C1 can be an electrolytic capacitor. Electrolytic capacitors have a larger capacitance per unit volume, and their rated capacitance can cover a wider range. Furthermore, electrolytic capacitors can be made from common industrial materials, making them more affordable than other types of capacitors.

[0056] Electrolytic capacitors typically contain an inductor to filter out pulsating interference signals, converting unidirectional pulsating DC current into a more stable DC current. The positive terminal of the filter capacitor C1 is connected to the first rectified output terminal V+ and the first input terminal of the drive module 20, while the negative terminal of the filter capacitor C1 is connected to the second rectified output terminal V- and the second input terminal of the drive module 20.

[0057] In this embodiment, the rectifier bridge BD1 consists of four diodes, namely D3, D4, D5, and D6. The common connection point of the anode of D3 and the cathode of D6 is the second rectifier input terminal L; the common connection point of the anode of D4 and the cathode of D5 is the first rectifier input terminal N; the common connection point of the cathode of D3 and the cathode of D4 is the first rectifier output terminal V+; and the common connection point of the anode of D5 and the anode of D6 is the second rectifier output terminal V-.

[0058] In this embodiment, the rectifier bridge BD1 is used to convert AC power to DC power, and the filter capacitor C1 is used to filter out interference signals generated by the external power supply.

[0059] In some optional implementations of this embodiment, see [link to relevant documentation]. Figure 4 The drive module 20 includes a transformer T1, an auxiliary winding circuit 21, a drive chip U1, and a secondary winding circuit 22. The transformer T1 includes a main winding, an auxiliary winding, and a secondary winding. The first end of the main winding is the first input end of the drive module 20, and the second end of the main winding is connected to the drive chip U1.

[0060] After receiving direct current, the main winding of transformer T1 stores energy and couples the energy to the secondary winding of transformer T1 to supply energy to subsequent circuits. At the same time, the direct current is delivered to the driver chip U1 through the main winding, powering up the driver chip U1 and enabling it to start working.

[0061] The first end of the auxiliary winding is connected to the input end of the auxiliary winding circuit 21, and the second end of the auxiliary winding is connected to the driver chip U1. Energy is stored by inducing DC current through the internal magnetic field to power the driver chip U1.

[0062] The first output terminal of the auxiliary winding circuit 21 is connected to the driver chip U1, and the common connection point between the second output terminal of the auxiliary winding circuit 21 and the second end of the auxiliary winding is the second input terminal of the driver module 20, which is connected to the driver chip U1.

[0063] The secondary winding is connected to the secondary winding circuit 22 to couple the energy of the primary winding and transmit it to the secondary winding circuit 22.

[0064] The secondary winding circuit 22 is connected to the control module 30 and is used to transmit the output current to the control module 30.

[0065] The driver chip U1 is connected to the secondary winding circuit 22 and the control module 30 respectively, and is used to regulate the output current by the voltage signal and communication signal obtained by acquiring the DC current.

[0066] In this embodiment, the driver chip U1 has a reference voltage inside. The internal logic of the driver chip U1 compares the collected voltage signal with the reference voltage to obtain a stable output current. At the same time, the output current can be controlled by adjusting the reference voltage of the internal logic of the driver chip U1 according to the communication signal and the communication protocol.

[0067] In this embodiment, the driver chip U1 has a built-in MOSFET and 11 pins, designated as pins 1 to 11. Pin 1 is connected to the common connection point between the second output terminal of the auxiliary winding circuit 21 and the second end of the auxiliary winding, and then connected to the second rectified output terminal V- of the rectifier bridge BD1. Pin 3 is connected to the second end of the main winding. DC power provides the operating voltage to the driver chip U1 through the main winding, auxiliary winding, and auxiliary winding circuit 21. After the driver chip U1 is powered on, it begins to work, and the built-in MOSFET is turned on.

[0068] In this embodiment, the secondary winding circuit 22 includes a first capacitor C2, a first switching transistor Q1, and a sampling resistor Rs, wherein:

[0069] The first terminal of the first capacitor C2 is connected to the first terminal of the secondary winding and the control module 30. The second terminal of the first capacitor C2 is connected to the source of the first switching transistor Q1. The gate of the first switching transistor Q1 is connected to the driver chip U1. The source of the first switching transistor Q1 is connected to the first terminal of the sampling resistor Rs. The drain of the first switching transistor Q1 is connected to the second terminal of the secondary winding. The first and second terminals of the sampling resistor Rs are connected to the driver chip U1 and the ground terminal GND.

[0070] Specifically, the gate of the first switching transistor Q1 is connected to pin 11 of the driver chip U1, pin 9 of the driver chip U1 is grounded, and pins 7 and 8 of the driver chip U1 are connected to the control module 30. The first capacitor C2 is a charging capacitor. The driver chip U1 outputs a high level through pin 10 to turn on the first switching transistor Q1. When the first switching transistor Q1 is turned on, the energy coupled to the secondary winding charges the first capacitor C2, which in turn charges the battery J2 through the control module 30.

[0071] In this embodiment, the first capacitor C2 can be an electrolytic capacitor. The positive electrode of the electrolytic capacitor can be aluminum or tantalum, and the oxide film (aluminum oxide or tantalum pentoxide) in close contact with the metal is the dielectric. The cathode is composed of a conductive material, an electrolyte (which can be liquid or solid), and other materials. Therefore, the positive and negative electrodes of the electrolytic capacitor have specific properties, ensuring that the positive electrode of the electrolytic capacitor is connected to the positive electrode of the external circuit, and the negative electrode of the electrolytic capacitor is connected to the negative electrode of the external circuit. Specifically, the positive electrode of the first capacitor C2 is connected to the battery J2 through the control module 30, and the negative electrode of the first capacitor C2 is grounded through the sampling resistor Rs, which is equivalent to the negative electrode.

[0072] In this embodiment, the first end of the sampling resistor Rs is connected to pin 10 of the driver chip U1, and the second end of the sampling resistor Rs is connected to pin 9 of the driver chip U1. The collected voltage signal is the voltage drop across the sampling resistor Rs. Specifically, the driver chip U1 obtains a stable output current by collecting the voltage drop generated by the current flowing through the sampling resistor Rs and comparing it with the internal reference voltage.

[0073] The control module 30 communicates with the driver chip U1. The driver chip U1 outputs corresponding control signals to the control module 30 through pins 7 and 8 according to the charging strategy. The control module 30 turns the battery on or off according to the control signals, thereby controlling the battery to charge or stop charging.

[0074] In some alternative implementations, the auxiliary winding circuit 21 includes a first diode D1 and a second capacitor C3. The anode of the first diode D1 is the input terminal of the auxiliary winding circuit 21, and the common connection point between the cathode of the first diode D1 and the first terminal of the second capacitor C3 is the first output terminal of the auxiliary winding circuit 21. The second terminal of the second capacitor C3 is the second output terminal of the auxiliary winding circuit 21.

[0075] Specifically, the anode of the first diode D1 is connected to the first end of the auxiliary winding of the transformer T, the cathode of the first diode D1 is connected to the first end of the second capacitor C3 and pin 2 of the driver chip U1, the second end of the second capacitor C3 is connected to pin 1 of the driver chip U1, and the auxiliary winding circuit 21 provides power to the driver chip.

[0076] The second capacitor C3 can be an electrolytic capacitor. Electrolytic capacitors usually have an inductor inside, which can filter out pulsating interference signals and convert unidirectional pulsating DC current into a more stable DC current.

[0077] In some alternative implementations, see [link to relevant documentation]. Figure 5 As shown, the control module 30 includes a control chip U2, a control output circuit 31, and a voltage divider circuit 32. The control chip U2 is connected to the drive chip U1 and the voltage divider circuit 32 respectively. It is used to determine the charging state of the battery J2 through the voltage divider circuit 32 and generate a communication signal based on the charging state to send to the drive chip U1.

[0078] The first input terminal of the control output circuit 31 is connected to the first terminal of the drive chip U1 and the secondary winding, respectively. The second input terminal of the control output circuit 31 is connected to the drive chip U1 and is used to turn on or off according to the control signal output by the communication signal. The output terminal of the control output circuit 31 is connected to the first terminal of the voltage divider circuit 32. The first terminal of the voltage divider circuit 32 is connected to the positive terminal of the battery, and the second terminal of the voltage divider circuit 32 is grounded.

[0079] Specifically, the control chip U2 is equipped with control pins 1 to 4. Control pin 1 is connected to pin 6 of the driver chip U1 via the bidirectional data line SDA. Control pin 2 is connected to pin 5 of the driver chip U1 via the clock line SCL. Control pin 3 is connected to the power supply line VCC of pin 3 of the driver chip U1. Control pin 4 is connected to the voltage divider circuit 32 and is used to monitor the charging status of battery J2.

[0080] SCL and SDA are equivalent to signal lines for data transmission; data is transmitted on SCL and SDA. The power supply line VCC is used to provide the operating voltage for the control chip U2.

[0081] The control chip U2 monitors the charging status of the battery J2 by ​​checking the voltage of the voltage divider circuit 32. Based on the charging status, it determines the charging strategy and generates a communication signal. The communication signal is transmitted to the driver chip U1 through the bidirectional data line SDA and the clock line SCL. The driver chip U1 adjusts its internal reference voltage according to the communication signal. After comparing the reference voltage with the acquired voltage signal, it calculates the output current and transmits it to the first switching transistor Q1 through pin 11. At the same time, it generates a control signal and transmits it to the control output circuit 31 through pins 7 and 8 to control its conduction or shutdown.

[0082] It should be understood that the detected voltage of the voltage divider circuit 32 corresponds to the voltage of battery J2, and the charging strategy is to use either a high current or a low current charging method based on the voltage of battery J2. For example, when the battery voltage is in the range of 3-3.2V, a low current charging method is used; when the battery voltage is in the range of 3.2-4.05V, a high current charging method is used; and when the battery voltage is in the range of 4.05-4.18V, a low current charging method is used.

[0083] In some optional implementations of this embodiment, the control output circuit 31 includes a second switch Q2, a first resistor R1, and a second diode D2. The drain of the second switch Q2 is the first input terminal of the control output circuit 31, the gate of the second switch Q2 is the second input terminal of the control output circuit 31, and the source of the second switch Q2 is the output terminal of the control output circuit 31. The first end of the first resistor R1 is connected to the source of the second switch Q2, and the second end of the first resistor R1 is connected to the anode of the second diode D2. The cathode of the second diode D2 is connected to the gate of the second switch Q2.

[0084] Specifically, the drain of the second switch Q2 is connected to pin 8 of the driver chip U1, and the gate of the second switch Q2 is connected to pin 7 of the driver chip U1.

[0085] In this embodiment, the voltage divider circuit 32 is connected in parallel to both ends of the battery J2. The voltage divider circuit 32 includes a first voltage divider resistor R2 and a second voltage divider resistor R3. The first end of the first voltage divider resistor R2 is the first end of the voltage divider circuit 32. The common connection point of the second end of the first voltage divider resistor R2 and the first end of the second voltage divider resistor R3 is connected to the control chip U2. The second end of the second voltage divider resistor R3 is grounded.

[0086] Specifically, the first terminal of the first voltage divider resistor R2 is connected to the positive terminal of battery J2, the second terminal of the second voltage divider resistor R3 is grounded, and the negative terminal of battery J2 is also grounded. The control chip U2 determines the charging state of battery J2, i.e., the charge state of battery J2, by detecting the voltage at the series voltage divider point of the first voltage divider resistor R2 and the second voltage divider resistor R3.

[0087] When the battery voltage is not fully charged, the control chip U2 controls the second switch Q2 to turn on to charge the battery; when the battery voltage is fully charged, the control chip U2 controls the second switch Q2 to turn off to stop charging. During the charging process, the control chip U2 monitors the battery power status and, through communication with the driver chip U1, adopts different charging strategies for different battery states, so that the battery achieves excellent power status and a good charging curve, reduces battery wear, and thus improves battery life.

[0088] In some alternative implementations, the charging circuit also includes a third capacitor C4, with the first end of the third capacitor C4 connected between the driver chip U1 and the control chip U2, and the second end of the third capacitor C4 grounded to filter out interference signals.

[0089] Specifically, the first end of the third capacitor C4 is connected to the power line VCC between pin 4 of the driver chip U1 and the control pin 3 of the control chip U2.

[0090] Based on the above charging circuit, the battery can be charged directly, reducing intermediate current loss and offering advantages such as large charging current and high charging efficiency. At the same time, the control module detects the charging status of the battery and determines the charging strategy based on the charging status, which can reduce battery wear and improve battery life.

[0091] Based on the charging circuit described above, this application also provides a lighting device that includes the charging circuit described above. This lighting device charges quickly and has a longer service life.

[0092] Obviously, the embodiments described above are only some embodiments of this application, not all embodiments. The accompanying drawings show preferred embodiments of this application, but do not limit the patent scope of this application. This application can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this application's specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the scope of patent protection of this application.

Claims

1. A charging circuit, characterized by, include: Rectifier and filter module, driver module, and control module; The rectifier and filter module is connected to the drive module and is used to convert AC power from the external power source into DC power and transmit it to the drive module. The drive module is connected to the control module and is used to regulate the output current according to the DC power and the communication signal sent by the control module, and to supply power to the battery through the control module. The control module is connected to the battery and is used to detect the charging status of the battery, determine the charging strategy for the battery based on the charging status, and send the communication signal to the drive module based on the charging strategy. The control module includes a control chip, a control output circuit, and a voltage divider circuit. The control chip is connected to the driver chip and the voltage divider circuit, respectively, and is used to determine the charging state of the battery through the voltage divider circuit, and generate the communication signal according to the charging state and send it to the driver chip. The first input terminal of the control output circuit is connected to the first terminal of the driver chip and the second terminal of the secondary winding, respectively. The second input terminal of the control output circuit is connected to the driver chip and is used to turn the circuit on or off according to the control signal output by the communication signal. The output terminal of the control output circuit is connected to the first terminal of the voltage divider circuit. The control output circuit includes a second switch, a first resistor, and a second diode. The drain of the second switch is the first input terminal of the control output circuit, the gate of the second switch is the second input terminal of the control output circuit, and the source of the second switch is the output terminal of the control output circuit. The first terminal of the first resistor is connected to the source of the second switch, and the second terminal of the first resistor is connected to the anode of the second diode. The cathode of the second diode is connected to the gate of the second switch. The first terminal of the voltage divider circuit is connected to the positive terminal of the battery, and the second terminal of the voltage divider circuit is grounded.

2. The charging circuit of claim 1, wherein, The rectifier and filter module includes a rectifier bridge and a filter capacitor. The rectifier bridge includes a first rectifier input terminal, a second rectifier input terminal, a first rectifier output terminal, and a second rectifier output terminal. The first rectifier input terminal and the second rectifier input terminal are connected to the external power supply. The first rectifier output terminal is connected to the first input terminal of the driver module, and the second rectifier output terminal is connected to the second input terminal of the driver module. The first end of the filter capacitor is connected to the first input terminal of the drive module, and the second end of the filter capacitor is connected to the second input terminal of the drive module.

3. The charging circuit of claim 2, wherein, The drive module includes a transformer, an auxiliary winding circuit, a drive chip, and a secondary winding circuit. The transformer includes a main winding, an auxiliary winding, and a secondary winding. The first end of the main winding is the first input end of the drive module, and the second end of the main winding is connected to the drive chip. The first end of the auxiliary winding is connected to the input end of the auxiliary winding circuit, and the second end of the auxiliary winding is connected to the driving chip. The energy stored by the DC current is induced by the internal magnetic field to power the driving chip. The first output terminal of the auxiliary winding circuit is connected to the driver chip, and the common connection point between the second output terminal of the auxiliary winding circuit and the second end of the auxiliary winding is the second input terminal of the driver module, which is connected to the driver chip. The secondary winding is connected to the secondary winding circuit for coupling the energy of the primary winding and transmitting it to the secondary winding circuit; The secondary winding circuit is connected to the control module and is used to transmit the output current to the control module; The driving chip is connected to the secondary winding circuit and the control module respectively, and is used to regulate the output current by the voltage signal obtained by acquiring the DC current and the communication signal.

4. The charging circuit of claim 3, wherein, The secondary winding circuit includes a first capacitor, a first switching transistor, and a sampling resistor, wherein: The first terminal of the first capacitor is connected to the first terminal of the secondary winding and the control module, and the second terminal of the first capacitor is connected to the source of the first switching transistor. The gate of the first switching transistor is connected to the driving chip, the source of the first switching transistor is connected to the first terminal of the sampling resistor, and the drain of the first switching transistor is connected to the second terminal of the secondary winding. The second end of the sampling resistor is connected to the driver chip and the ground terminal.

5. The charging circuit according to claim 3, characterized in that, The auxiliary winding circuit includes a first diode and a second capacitor. The anode of the first diode is the input terminal of the auxiliary winding circuit, and the common connection point between the cathode of the first diode and the first terminal of the second capacitor is the first output terminal of the auxiliary winding circuit. The second terminal of the second capacitor is the second output terminal of the auxiliary winding circuit.

6. The charging circuit according to claim 1, characterized in that, The voltage divider circuit includes a first voltage divider resistor and a second voltage divider resistor. The first end of the first voltage divider resistor is the first end of the voltage divider circuit. The common connection point of the second end of the first voltage divider resistor and the first end of the second voltage divider resistor is connected to the control chip. The second end of the second voltage divider resistor is grounded.

7. The charging circuit according to claim 1, characterized in that, The charging circuit also includes a third capacitor, the first end of which is connected between the driver chip and the control chip, and the second end of which is grounded to filter out interference signals.

8. A lighting device, characterized in that, Includes the charging circuit as described in any one of claims 1 to 7.

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