Charging circuit and device and electronic product

Abstract

The utility model provides a charging circuit, a charging device and an electronic product, the charging circuit is applied to the electronic product, the battery product comprises a battery, and the battery comprises an input interface which is provided with a current configuration pin; the power input end of the charging management circuit is electrically connected with the input interface, the output end of the charging management circuit is electrically connected with the battery, and the control end of the charging management circuit is electrically connected with the main control circuit; and the detection input end of the main control circuit is electrically connected with the current configuration pin of the input interface. According to the utility model, the main control circuit detects the voltage of the current configuration pin of the input interface and controls the charging management circuit to charge the battery, thereby realizing intelligent adjustment of the charging current and safe power supply. On the premise that a special protocol IC chip is not added, the scheme meeting the IEC62680-1-3 standard is realized at low cost.

Description

Technical Field

[0001] This utility model relates to the field of electronic product charging technology, and in particular to a charging circuit, device and electronic product. Background Technology

[0002] The IEC 62680-1-3 standard primarily specifies the design, performance, and compatibility requirements for USB Type-C cables and connectors. This includes the cable's electrical characteristics, mechanical structure, and key parameters ensuring interoperability between different devices. Therefore, implementation must ensure these requirements are met. Currently, existing charging circuits, to comply with the IEC 62680-1-3 standard, charge the device with a current below 5V / 500mA. However, this limits charging efficiency, especially for devices with large-capacity batteries, where this charging speed may not meet users' fast charging needs.

[0003] Another technical solution to meet the IEC62680-1-3 standard is to add a PD protocol IC to the product. Based on the information identified by the protocol IC, the power of the power supply is deduced, and the charging current is set after communicating with the MCU. However, introducing the PD protocol IC and related MCU communication modules will increase the cost of the product. Utility Model Content

[0004] The main purpose of this utility model is to propose a charging circuit, device and electronic product, which aims to achieve a solution that meets the IEC62680-1-3 standard at low cost without adding a dedicated protocol IC chip.

[0005] This utility model proposes a charging circuit, which is applied to electronic products. The battery product includes a battery, comprising:

[0006] An input interface has a current configuration pin, which is electrically connected to a pull-down circuit. When the input interface is connected to a power supply device, the pull-down circuit forms a voltage divider circuit with the pull-up circuit in the power supply device via the current configuration pin of the input interface.

[0007] A charging management circuit, wherein the power input terminal of the charging management circuit is electrically connected to the input interface, the output terminal is electrically connected to the battery, and the control terminal of the charging management circuit is electrically connected to the main control circuit;

[0008] The main control circuit has its detection input terminal electrically connected to the current configuration pin of the input interface. The main control circuit is used to detect a first voltage on the current configuration pin and control the charging management circuit to convert the voltage output by the power supply device and output it to the battery according to the first voltage, so as to charge the battery according to the charging current corresponding to the first voltage.

[0009] Optionally, the input interface includes a TYPE-C interface, the current configuration pins include a CC1 pin and a CC2 pin; the first voltage includes the voltage of the CC1 pin and the voltage of the CC2 pin;

[0010] The main control circuit is used to control the charging management circuit to convert the voltage output by the power supply device and output it to the battery according to the voltage of the CC1 pin or the voltage of the CC2 pin, so as to charge the battery according to the charging current corresponding to the first voltage.

[0011] Optionally, the pull-down circuit includes:

[0012] The first resistor has one end connected to the CC1 pin and the other end grounded. When the CC1 pin is electrically connected to the power supply terminal of the power supply device, the power supply device, the CC1 pin, and the first resistor form a first current path and pull down the voltage of the CC1 pin.

[0013] The second resistor has one end connected to the CC2 pin and the other end grounded. When the CC2 pin is electrically connected to the power supply terminal of the power supply device, the power supply device, the CC2 pin, and the second resistor form a second current path and pull down the voltage of the CC2 pin.

[0014] Optionally, the main control circuit includes:

[0015] An analog-to-digital converter circuit, wherein the input terminal of the analog-to-digital converter circuit is electrically connected to a current configuration pin, and the analog-to-digital converter circuit is used to acquire and convert the first voltage of the current configuration pin into a digital signal output;

[0016] The main controller is electrically connected to the output terminal of the analog-to-digital converter circuit. The main controller is used to receive and output control signals to the charging management circuit according to the digital signals output by the analog-to-digital converter circuit, so that the charging management circuit converts the voltage output by the power supply device and outputs it to the battery, so as to charge the battery according to the charging current corresponding to the first voltage.

[0017] Optionally, the analog-to-digital conversion circuit and the main controller are integrated into the same chip.

[0018] Optionally, the charging circuit further includes:

[0019] A voltage conversion circuit is provided, wherein the input terminal of the voltage conversion circuit is connected to the power supply terminal of the battery, and the output terminal is electrically connected to the power input terminal of the main control circuit; the voltage conversion circuit is used to convert the battery output voltage into the main control voltage to supply power to the main control circuit.

[0020] Optionally, the charging circuit further includes:

[0021] An indicator circuit is electrically connected to the main control circuit; the indicator circuit is used to display the operating status of the charging circuit and the battery level.

[0022] Optionally, the charging management circuit has a data communication terminal, which is electrically connected to the main control circuit.

[0023] This utility model also proposes a charging device, including the charging circuit as described above.

[0024] This utility model also proposes an electronic product, including a charging device and a battery as described above, wherein the charging device is connected to the battery.

[0025] This invention uses a main control circuit to detect the voltage of the current configuration pin at the input interface, and controls the charging management circuit to charge the battery, thus achieving intelligent adjustment of the charging current and safe power supply. It achieves a low-cost solution that meets the IEC62680-1-3 standard without adding a dedicated protocol IC chip. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0027] Figure 1 This is a structural diagram of a charging circuit according to the present invention.

[0028] Figure 2 This is a connection diagram of the pull-up and pull-down circuits of a charging circuit according to this utility model;

[0029] Figure 3 This is a graph showing the relationship between the pull-up resistor and pull-up voltage at the DFP terminal.

[0030] Figure 4 This is a graph showing the relationship between the pull-down resistor and pull-down voltage at the UFP terminal.

[0031] The diagram shows the following circuit diagrams: Input interface 01, Charging management circuit 02, Main control circuit 03, Pull-down circuit 04.

[0032] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0035] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0036] This utility model proposes a charging circuit, which is applied to electronic products, including batteries, such as... Figure 1 As shown, it includes:

[0037] Input interface 01 has a current configuration pin, which is electrically connected to pull-down circuit 04. When input interface 01 is connected to a power supply device, pull-down circuit 04 forms a voltage divider circuit with pull-up circuit in the power supply device through the current configuration pin of input interface 01.

[0038] The charging management circuit 02 has its power input terminal electrically connected to the input interface 01, its output terminal electrically connected to the battery, and its control terminal electrically connected to the main control circuit 03.

[0039] The main control circuit 03 is electrically connected to the current configuration pin of the input interface 01. The main control circuit 03 is used to detect the first voltage of the current configuration pin and control the charging management circuit 02 to convert the voltage output by the power supply device and output it to the battery according to the first voltage, so as to charge the battery according to the charging current corresponding to the first voltage.

[0040] More specifically, the IEC 62680-1-3 standard primarily specifies the design, performance, and compatibility requirements for USB Type-C cables and connectors. This includes the cable's electrical characteristics, mechanical structure, and key parameters ensuring interoperability between different devices. Therefore, these requirements must be met when implementing a solution.

[0041] Current charging circuits meet the IEC 62680-1-3 standard by keeping the charging current below 5V / 500mA. However, this approach limits charging efficiency, especially for devices with large-capacity batteries, where this charging speed may not meet users' fast charging needs. Adding a PD protocol IC to the product, which identifies the power supply based on the information received, communicates with the MCU to set the charging current to meet the IEC 62680-1-3 standard, would increase product cost due to the introduction of the PD protocol IC and related MCU communication modules.

[0042] To address the aforementioned deficiencies, this application proposes a charging circuit for electronic products, wherein a power supply device supplies power to the battery of the electronic product through the charging circuit, and the charging circuit includes:

[0043] Input interface 01 has a current configuration pin, which is electrically connected to pull-down circuit 04. When input interface 01 is connected to a power supply device, pull-down circuit 04 forms a voltage divider circuit with pull-up circuit in the power supply device via the current configuration pin of input interface 01. Input interface 01 provides a physical connection point, allowing the output of the power supply device to be tightly connected to the input of the charging circuit. This connection is typically achieved through a plug and socket, ensuring stable and reliable power transmission.

[0044] In this application, the input interface 01 has a current configuration pin, which is electrically connected to the pull-down circuit 04. When the input interface 01 is not connected to a power supply, one end of the current configuration pin is floating and not conducting. When the input interface 01 is connected to a power supply, the pull-down circuit 04 is connected to the output of the power supply via the current configuration pin of the input interface 01, forming a complete circuit, at which point the current configuration pin is conducting. The output of the power supply is connected to a pull-up circuit, which provides a stable voltage signal for broadcasting the current carrying capacity of the power supply. The pull-down circuit 04 forms a voltage divider circuit with the pull-up circuit in the power supply via the current configuration pin of the input interface 01. The output of the power supply pulls the current configuration pin up through the pull-up circuit, while the input interface 01 pulls the current configuration pin down through the pull-down circuit 04. At this time, the charging circuit can obtain the broadcast current of the power supply by detecting the voltage of the current configuration pin.

[0045] The charging management circuit 02 has its power input terminal electrically connected to the input interface 01 and its output terminal electrically connected to the battery. The control terminal of the charging management circuit 02 is electrically connected to the main control circuit 03. The charging management circuit 02 converts the input power supply voltage into the voltage required by the battery, including stages such as trickle charging, constant current charging, and constant voltage charging. It also includes charging current setting, charging status signals (charging in progress, fully charged, etc.), temperature detection pin, and enable pin.

[0046] The main control circuit 03 is electrically connected to the current configuration pin of the input interface 01. The main control circuit 03 is used to detect the first voltage of the current configuration pin and control the charging management circuit 02 to convert the voltage output by the power supply device and output it to the battery according to the first voltage, so as to charge the battery according to the charging current corresponding to the first voltage.

[0047] When input interface 01 is connected to a power supply device, the main control circuit 03 detects the first voltage on the current configuration pin. Since the pull-down circuit 04 is connected to the output terminal of the power supply device via the current configuration pin of input interface 01, forming a complete circuit, the first voltage changes. The signal from the first voltage detected by the main control circuit 03 controls the charging management circuit to convert the voltage output by the power supply device and output it to the battery. Simultaneously, due to different power supply capacities, the first voltage on the current configuration pin changes according to the power supply capacity when input interface 01 is connected to the power supply device. The control circuit controls the charging management circuit 02 to output a charging current corresponding to the first voltage. More specifically, this application, according to the IEC62680-1-3 standard, implements charging with a USB Type-C cable using a charging current of 5V / 500mA; 5V / 1.5A; and 5V / 3A.

[0048] This invention uses the main control circuit 03 to detect the voltage of the current configuration pin of the input interface 01, and controls the charging management circuit 02 to charge the battery, thus achieving intelligent adjustment of the charging current and safe power supply. It achieves a solution that meets the IEC62680-1-3 standard at low cost without adding a dedicated protocol IC chip.

[0049] In one embodiment, the input interface 01 includes a TYPE-C interface, and the current configuration pins include a CC1 pin and a CC2 pin; the first voltage includes the voltage of the CC1 pin and the voltage of the CC2 pin.

[0050] The main control circuit 03 is used to control the charging management circuit 02 to convert the voltage output by the power supply device and output it to the battery according to the voltage of the CC1 pin or the voltage of the CC2 pin, so as to charge the battery according to the charging current corresponding to the first voltage.

[0051] The TYPE-C interface supports multiple power delivery modes, including standard USB power delivery and higher power delivery (such as via the USB Power Delivery protocol). The CC1 and CC2 pins are used to negotiate power delivery parameters between the power supply and the powered device, such as current magnitude and voltage level.

[0052] When a Type-C interface is plugged in, either pin CC1 or pin CC2 forms a current path. By detecting the voltage change along this path, it can be determined whether the interface is correctly connected. Since the Type-C interface supports both normal and reverse insertion, ensuring a correct electrical connection regardless of how the plug is inserted into the socket, the voltages on pins CC1 and CC2 will differ depending on whether the plug is inserted correctly or incorrectly. When plugged in correctly, the power supply output is connected to pin CC1, which is pulled low by pull-down circuit 04, while pin CC2 is typically high (logic high). Conversely, when the power supply output is connected to pin CC2, pin CC2 is pulled low by pull-down circuit 04, while pin CC1 is typically high.

[0053] Once the main control circuit 03 detects that the voltage of pin CC1 or CC2 is pulled low, it can determine whether the interface is correctly connected and output a control signal to the charging management circuit 02. The charging management circuit 02 converts the voltage output by the power supply device and outputs it to the battery. At the same time, the main control circuit 03 obtains the first voltage at which pin CC1 or CC2 is pulled low, analyzes the power of the power supply device, and controls the charging management circuit 02 to output a charging current corresponding to the first voltage based on the first voltage pulled low.

[0054] In one embodiment, the pull-down circuit 04 includes:

[0055] The first resistor has one end connected to the CC1 pin and the other end grounded. When the CC1 pin is electrically connected to the power supply terminal of the power supply device, the power supply device, the CC1 pin, and the first resistor form a first current path and pull down the voltage of the CC1 pin.

[0056] The second resistor has one end connected to the CC2 pin and the other end grounded. When the CC2 pin is electrically connected to the power supply terminal of the power supply device, the power supply device, the CC2 pin, and the second resistor form a second current path and pull down the voltage of the CC2 pin.

[0057] When the Type-C interface is not connected, the CC1 and CC2 pins are typically at a high level. This is because, without a connected cable, these two pins are not pulled low by pull-down resistors.

[0058] When the CC1 pin is electrically connected to the power supply terminal of the power supply device, the power supply device, the CC1 pin, and the first resistor form the first current path. The output terminal of the power supply device is connected to a pull-up circuit, which provides a stable voltage signal for broadcasting the current carrying capacity of the power supply device. The first resistor forms a voltage divider circuit with the pull-up circuit in the power supply device through the current configuration pin of the input interface 01. The output terminal of the power supply device will pull up the voltage of the CC1 pin through the pull-up circuit, while the input interface 01 will pull down the voltage of the CC1 pin through the pull-down circuit 04, thereby lowering the voltage of the CC1 pin. The broadcast current of the power supply device can be obtained by detecting the voltage of the CC1 pin.

[0059] Similarly, when the CC2 pin is electrically connected to the power supply terminal of the power supply device, the power supply device, the CC2 pin and the second resistor form a second current path and pull down the voltage of the CC2 pin. The working principle of the CC2 pin is the same as that of the CC1 pin, and will not be described in detail.

[0060] like Figure 2 As shown, there are two types of power flow in a USB connection:

[0061] Receive Port (UFP): This is the port that consumes VBUS power when connected. Receiver port devices are typically powered devices. Applications include USB-powered lights or fans, charging battery-powered products, and other peripherals. Source Port (DFP): This is the port that supplies power via VBUS when connected. Common source ports are host or hub DFPs. A typical source port application is a Type-C charger.

[0062] like Figure 3 and Figure 4As shown, according to the Type-C protocol specification, the Rp resistor (resistor in the power supply device's pull-up circuit) at the DFP terminal typically has a resistance value of 56K, 22K, or 10K, while the corresponding Rd resistor (first or second resistor) at the UFP terminal has a resistance value of 5.1K. Therefore, when the main control circuit 03 detects a CC1 / CC2 pin voltage of 0.25-0.61V, it controls the current of the charging management circuit 02, setting the battery charging current to 500mA; when the main control circuit 03 detects a CC1 / CC2 pin voltage of 0.7-1.16V, it controls the current of the charging management circuit 02, setting the battery charging current to 1.5A; and when the main control circuit 03 detects a CC1 / CC2 pin voltage of 1.31-2.0V, it controls the current of the charging management circuit 02, setting the battery charging current to 3A.

[0063] In one embodiment, the main control circuit 03 includes:

[0064] The analog-to-digital converter (ADC) circuit has its input terminal electrically connected to the current configuration pin. The ADC circuit is used to acquire and convert the first voltage on the current configuration pin into a digital signal output. The main function of the ADC circuit is to convert the analog signal (here, the voltage on the current configuration pin) into a digital signal, because digital signals are easier for the microprocessor or main controller to process. The converted digital signal is output to the main controller.

[0065] The main controller is electrically connected to the output of the analog-to-digital converter (ADC). The main controller receives and outputs control signals to the charging management circuit 02 based on the digital signals output by the ADC. This causes the charging management circuit 02 to convert the voltage output from the power supply device and output it to the battery, charging the battery according to a charging current corresponding to a first voltage. The control signals output by the main controller are determined based on the digital signals output by the ADC (i.e., the voltage on the current configuration pin). These control signals are designed to cause the charging management circuit 02 to appropriately convert the voltage output from the power supply device before outputting it to the battery.

[0066] In one embodiment, the analog-to-digital converter (ADC) circuitry and the main controller are integrated on the same chip. This integrated design optimizes the signal transmission path between the ADC and the main controller, reducing signal loss and interference, thereby improving overall system performance. Furthermore, because they share resources on the same chip, tighter timing control and synchronized operation are possible. The integrated design helps reduce power consumption because power can be managed more efficiently, reducing unnecessary energy loss. Additionally, static power consumption can be further reduced by minimizing interconnect and packaging steps.

[0067] In one embodiment, the charging circuit further includes:

[0068] A voltage conversion circuit is included, with its input connected to the battery's power supply terminal and its output terminal electrically connected to the power input terminal of the main control circuit 03. This circuit converts the battery's output voltage into the main control voltage to power the main control circuit 03. Preferably, the voltage conversion circuit is a Low Dropout Regulator (LOD) circuit. Compared to other types of voltage conversion circuits, LDO circuits are less expensive due to their simpler circuit structure and fewer external component requirements. LDO circuits operate in the linear region, eliminating the need for frequent switching, thus generating less noise and ripple, providing a cleaner power supply environment. LDO circuits also possess excellent voltage regulation capabilities, maintaining a stable output voltage even when the input voltage fluctuates or the load changes.

[0069] In one embodiment, the charging circuit further includes:

[0070] The indicator circuit is electrically connected to the main control circuit 03; it displays the operating status of the charging circuit and the battery level. The main function of the indicator circuit is to show the user the operating status of the charging circuit and the battery level. This can be achieved in several ways, such as:

[0071] LED indicator lights: Use different colored LEDs to indicate different charging statuses (e.g., red light indicates charging, green light indicates charging complete) and battery level (e.g., indicated by LED brightness or flashing frequency); Display screen: Provides more detailed information, such as battery percentage, remaining charging time, etc.; Sound prompts: Use buzzers or speakers to emit different sounds to indicate charging status and battery level.

[0072] In one embodiment, the charging management circuit 02 has a data communication terminal, which is electrically connected to the main control circuit 03. The data communication terminal transmits information from the charging management circuit 02 to the main control circuit 03 through a specific communication protocol and interface. After receiving the information from the charging management circuit 02, the main control circuit 03 parses and processes it according to the communication protocol. This includes steps such as converting analog signals to digital signals, verifying the data, and handling errors. Based on the parsed information, the main control circuit 03 evaluates the battery's charging state and adjusts the charging strategy accordingly. This may include adjusting parameters such as charging current, charging voltage, or charging time to optimize charging efficiency and battery life. Preferably, the charging management circuit 02 and the main control circuit 03 communicate via IIC (Inter-Integrated Circuit).

[0073] This invention also proposes a charging device, including the charging circuit described above. The charging circuit detects the voltage of the current configuration pins of the input interface 01 through the main control circuit 03, and controls the charging management circuit 02 to charge the battery, achieving intelligent adjustment of the charging current and safe power supply. Without adding a dedicated protocol IC chip, a solution meeting the IEC62680-1-3 standard is achieved at low cost. When the main control circuit 03 detects that the voltage of the CC1 / CC2 pins is 0.7-1.16V, it controls the current of the charging management circuit 02, setting the charging current to 1.5A; when the main control circuit 03 detects that the voltage of the CC1 / CC2 pins is 1.31-2.0V, it controls the current of the charging management circuit 02, setting the charging current to 3A. The charging current can be set to three levels: 5V / 500mA, 5V / 1.5A, and 5V / 3A, and can achieve a maximum charging power of 15W.

[0074] This utility model also proposes an electronic product, including a charging device and a battery as described above, with the charging device connected to the battery. The charging device has a wide range of applications; the electronic product in this application includes TWS earphones, Bluetooth mice, Bluetooth keyboards, navigators, and other products that use a Type-C interface to charge their own lithium batteries.

[0075] The above embodiments are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A charging circuit, characterized by, The charging circuit is applied to an electronic product, and the electronic product comprises a battery, comprising: an input interface having a current configuration pin, the current configuration pin of the input interface being electrically connected with a pull-down circuit; when the input interface is connected with a power supply device, the pull-down circuit forms a voltage dividing circuit with a pull-up circuit in the power supply device through the current configuration pin of the input interface; a charging management circuit, a power input end of the charging management circuit being electrically connected with the input interface, and an output end being electrically connected with the battery, a control end of the charging management circuit being electrically connected with a master control circuit; the master control circuit, a detection input end of the master control circuit being electrically connected with the current configuration pin of the input interface, wherein the master control circuit is used for detecting a first voltage of the current configuration pin, and controlling the charging management circuit to output a voltage output by the power supply device to the battery after voltage conversion, so as to charge the battery according to a charging current corresponding to the first voltage.

2. The charging circuit of claim 1, wherein, The input interface comprises a TYPE-C interface, and the current configuration pin comprises a CC1 pin and a CC2 pin; the first voltage comprises a CC1 pin voltage and a CC2 pin voltage; the master control circuit, for controlling the charging management circuit to output the voltage output by the power supply device to the battery after voltage conversion according to the CC1 pin voltage or the CC2 pin voltage, so as to charge the battery according to the charging current corresponding to the first voltage.

3. The charging circuit of claim 2, wherein, The pull-down circuit comprises: a first resistor, one end of the first resistor being connected with the CC1 pin, and the other end being grounded; when the CC1 pin is electrically connected with a power supply end of the power supply device, a first current path formed by the power supply device, the CC1 pin and the first resistor pulls down the voltage of the CC1 pin; a second resistor, one end of the second resistor being connected with the CC2 pin, and the other end being grounded; when the CC2 pin is electrically connected with the power supply end of the power supply device, a second current path formed by the power supply device, the CC2 pin and the second resistor pulls down the voltage of the CC2 pin.

4. The charging circuit of claim 1, wherein, The master control circuit comprises: an analog-to-digital conversion circuit, an input end of the analog-to-digital conversion circuit being electrically connected with the current configuration pin, and the analog-to-digital conversion circuit being used for collecting and converting the first voltage of the current configuration pin into a digital signal and outputting the digital signal; a master controller, the master controller being electrically connected with an output end of the analog-to-digital conversion circuit, and the master controller being used for receiving and outputting a control signal to the charging management circuit according to the digital signal output by the analog-to-digital conversion circuit, so that the charging management circuit outputs the voltage output by the power supply device to the battery after voltage conversion, so as to charge the battery according to the charging current corresponding to the first voltage.

5. The charging circuit of claim 4, wherein, The analog-to-digital conversion circuit and the master controller are integrated in the same chip.

6. The charging circuit according to any one of claims 1 to 5, wherein The charging circuit further comprises: a voltage conversion circuit, a power input end of the voltage conversion circuit being electrically connected with a power supply end of the battery, and an output end being electrically connected with a power input end of the master control circuit; the voltage conversion circuit is used for converting the output voltage of the battery into a master control voltage, so as to supply power to the master control circuit.

7. The charging circuit according to any one of claims 1 to 5, wherein The charging circuit further comprises: An indicating circuit is electrically connected with the main control circuit; the indicating circuit is used for displaying the working state of the charging circuit and the power of the battery.

8. The charging circuit of claim 1, wherein, The charging management circuit has a data communication end which is electrically connected with the main control circuit.

9. A charging device, characterized by The charging circuit comprises the charging device according to any one of claims 1-8.

10. An electronic product, characterized by comprising: The charging device according to claim 9 is connected with the battery.

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