Multi-path self-adaptive constant-voltage constant-current charging device

Abstract

The invention provides a multi-path self-adaptive constant-voltage constant-current charging device, and the device comprises an input module which comprises a plurality of paths of input power supplies with the same rated voltage and limited power; the summarizing module is connected with each path of input power supply and combines the input power supplies into a single path for output; the conversion module is connected with the gathering module and is used for converting the single-path output voltage into target voltage and realizing constant-voltage output through a feedback loop; the detection module is connected with the input module and is used for detecting the effective path number of the input power supply and outputting a signal; and the control module dynamically adjusts the gain of the amplification circuit according to the output signal, and realizes constant current output by combining the current feedback of the conversion module. The summarizing module solves the problems of cost and size; the detection module and the control module jointly improve efficiency and stability; and meanwhile, a dynamic adjusting mechanism of the control module ensures constant-voltage and constant-current output under different input conditions. The modules operate cooperatively, so that the charging device is superior to the prior art in expansibility, efficiency and stability.

Description

Technical Field

[0001] This invention relates to the field of charging device technology, and more specifically to a multi-channel adaptive constant voltage and constant current charging device. Background Technology

[0002] Currently, in applications where multiple power supplies with the same rated voltage and limited power are used to charge rechargeable batteries, the most common power supply design method is to design each power supply separately. This means each input requires an independent step-down module, feedback circuit, and diode. The outputs of these power supplies are then connected in parallel to charge the battery. For example, if there are three input power supplies, three identical power supply circuits are designed, and the outputs are connected in parallel via diodes. While this power supply circuit design is simple, it has the following drawbacks: 1. High cost / size. While cost and size are manageable with a small number of input power lines, the cost / size increases exponentially with the number of input power lines, significantly limiting its practical application. 2. Low efficiency. Current power supply designs involve designing a separate power circuit for each input power source, and then connecting all the power sources in parallel through diodes to charge the battery. However, due to the voltage drop of the diodes (typically 0.7V), there is additional power loss during high-current charging (power loss = 0.7V * charging current), which significantly reduces charging efficiency. 3. Unstable output voltage. Since each output power supply is output through diodes connected in parallel, the voltage drop of the diodes changes dynamically in high temperature, low temperature, high current, and low current applications, resulting in unstable output voltage, especially when the rated output voltage is low, the output voltage fluctuation is relatively greater. Summary of the Invention

[0003] The purpose of this invention is to address the aforementioned problems and deficiencies by providing a multi-channel adaptive constant voltage and constant current charging device, which solves the problems of high cost / size, low efficiency, and unstable output voltage in existing multi-channel power input charging devices.

[0004] The technical solution of this invention is implemented as follows: The present invention discloses a multi-channel adaptive constant voltage and constant current charging device, characterized in that it comprises: an input module, including multiple input power supplies with the same rated voltage and limited power; a summarizing module, connected to the output terminals of each input power supply of the input module, for merging the multiple input power supplies into a single output; a conversion module, connected to the output terminal of the summarizing module, for converting the voltage of the single output into a target voltage, and achieving constant voltage output through a feedback loop; a detection module, connected to the input module, for detecting and determining the effective number of input power supplies and outputting a signal; and a control module, for dynamically adjusting the gain of the amplifier circuit according to the output signal of the detection module, and combining it with the current feedback adjustment of the conversion module to achieve constant charging current output.

[0005] In some embodiments, the aggregation module includes a Schottky diode, with one Schottky diode connected to the output terminal of each input power supply. By connecting multiple input power supplies in parallel and using the unidirectional conduction and dynamic isolation of the Schottky diode, multiple input power supplies are aggregated into a single output.

[0006] In some embodiments, the conversion module includes a buck DC / DC converter chip and a feedback loop; the single output terminal of the aggregation module is connected to the buck DC / DC converter chip, which reduces the received voltage to the target voltage and then delivers it to the rechargeable battery; the feedback loop is connected between the output pin and the FB pin of the buck DC / DC converter chip, and is used to collect the voltage output to the rechargeable battery in real time and feed it back to the FB pin to achieve constant voltage control.

[0007] Furthermore, the feedback loop includes two acquisition resistors. One acquisition resistor is connected between the voltage output terminal of the buck DC / DC converter chip and the FB pin, and the other acquisition resistor is connected between the FB pin and ground. When the voltage received by the FB pin is less than the reference voltage set by the buck DC / DC converter chip, the output voltage is increased. When the voltage received by the FB pin is greater than the reference voltage, the output voltage is decreased, and finally, dynamic balance is achieved.

[0008] In some embodiments, the conversion module further includes a voltage divider circuit connected between the summing module and the buck DC / DC converter chip, used to divide the voltage of the single-channel output to obtain the minimum system startup voltage.

[0009] Furthermore, the minimum system startup voltage is input to the enable pin of the buck DC / DC converter chip for detection and judgment; if the minimum system startup voltage is greater than or equal to the system-set voltage threshold, the system starts working; if the minimum system startup voltage is less than the system-set voltage threshold, the system is prohibited from starting.

[0010] In some embodiments, the detection module includes a power input detection unit and a logic processing unit. Each input power supply is connected to the power input detection unit. The power input detection unit is used to detect the power-on or power-off state of the input power supply and transmits the obtained power status signal to the logic processing unit. The logic processing unit processes the signal and outputs a power supply status signal.

[0011] Furthermore, the power input detection unit includes a voltage divider resistor, a voltage comparator, and a pull-up resistor. The voltage divider resistor is connected to the output terminal of each power supply and is used to divide the output voltage and output it to the non-inverting input of the voltage comparator. The inverting input of the voltage comparator is connected to a reference voltage. The power status signal is output after comparing the voltages at the non-inverting input and the inverting input. The pull-up resistor is connected to the output terminal of the voltage comparator and is used to stabilize the high-level power status signal for the logic processing unit to read.

[0012] In some embodiments, the control module includes an analog switch, a resistor network, and an operational amplifier. The input terminal of the analog switch is connected to the output terminal of the detection module, and the resistor network is connected to the output terminal of the analog switch. The feedback resistor in the resistor network is selected by switching according to the output signal of the detection module. The operational amplifier performs operation and adjustment according to the selected feedback resistor and the current feedback of the conversion module, so that the output voltage of the operational amplifier is maintained at the reference voltage set by the buck DC / DC conversion chip, so as to keep the charging current constant.

[0013] Furthermore, the conversion module includes a current sampling resistor. The operational amplifier acquires the voltage across the current sampling resistor and then calculates the dynamic charging current Ic using a formula: ,in The output voltage of the operational amplifier is adjusted through operation. It is equal to the voltage threshold; R154 is the resistance value of the current sampling resistor; R162 is the resistance value of the fixed feedback resistor in the dynamic amplifier circuit; The resistance value of the feedback resistor is dynamically switched by the analog switch according to the output signal of the detection module.

[0014] The beneficial effects of this invention are: (1) Since multiple input power supplies are combined into a single output through the aggregation module, thus replacing the traditional independent circuit design of multiple input power supplies, the cost and volume should not increase exponentially with the increase of the number of input power supplies. It is necessary to meet the requirements of multiple power supply inputs and effectively control the volume and cost. Moreover, the aggregation module can reduce unnecessary power loss during power conversion and improve charging efficiency.

[0015] (2) Because the feedback loop in the conversion module is used to monitor the output voltage in real time, the working state of the conversion module is dynamically adjusted to achieve constant voltage output. Therefore, the output voltage is stable and reliable and is not affected by diode voltage drop or input fluctuation.

[0016] (3) By monitoring the number of input power sources in real time through the detection module and dynamically adjusting the charging current through the control module, the adaptive allocation of input power is achieved, maximizing the utilization of multiple input power sources and improving charging efficiency.

[0017] (4) Constant current control is achieved by dynamically adjusting the gain of the amplifier circuit through the output signals of the control module and the detection module, combined with the current feedback adjustment of the conversion module. Therefore, current fluctuations caused by unstable input power supply can be effectively avoided.

[0018] The invention will now be further described with reference to the accompanying drawings. Attached Figure Description

[0019] Figure 1 This is a structural block diagram of the multi-channel adaptive constant voltage and constant current charging device of the present invention; Figure 2 This is a schematic diagram of the charging circuit of the multi-channel adaptive constant voltage and constant current charging device of the present invention; Figure 3 This is a schematic diagram of the power input detection unit circuit of the multi-channel adaptive constant voltage and constant current charging device of the present invention; Figure 4 This is a schematic diagram of the logic processing unit circuit of the multi-channel adaptive constant voltage and constant current charging device of the present invention; Figure 5 This is a schematic diagram of the control module circuit of the multi-channel adaptive constant voltage and constant current charging device of the present invention. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0021] In the description of this invention, it should be understood that the terms "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, features defined with "first" and "second" may explicitly or implicitly include one or more of these features, used to distinguish and describe features, without any order or emphasis.

[0022] In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "fitting," "connected," "linked," and "installed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] The multi-channel adaptive constant voltage and constant current charging device of the present invention will now be described with reference to the accompanying drawings.

[0025] like Figure 1 As shown, the multi-channel adaptive constant voltage and constant current charging device of the present invention includes: an input module, comprising multiple input power supplies with the same rated voltage and limited power; a summarizing module, connected to the output terminals of each input power supply of the input module, for merging the multiple input power supplies into a single output; a conversion module, connected to the output terminal of the summarizing module, for converting the voltage of the single output into a target voltage, and achieving constant voltage output through a feedback loop; a detection module, connected to the input module, for detecting and determining the number of valid input power supplies and outputting a signal; and a control module, for dynamically adjusting the gain of the amplifier circuit according to the output signal of the detection module, and combining it with the current feedback adjustment of the conversion module to achieve constant charging current output.

[0026] Understandingly, the multi-input power supply of this input module refers to multiple independent power inputs, such as multiple solar panels, multiple charging piles, multiple USB chargers, etc. Designing or selecting power supplies with the same rated voltage and limited power ensures that all input power supplies have the same and stable output voltage, thereby simplifying circuit design and avoiding current backflow or uneven power distribution caused by voltage differences. Here, multi-input power supply refers to two or more input power supplies, such as... Figure 2 As shown, the initial design of this embodiment is 4-channel input power, and the number of input power channels can be increased or decreased later according to requirements.

[0027] The input module of this invention is simply the direct output of multiple power supplies without any additional circuit design, thus resulting in a simpler structure. The outputs of the multiple power supplies are directly connected in parallel to the aggregation module for merging. This aggregation module can use Schottky diodes to aggregate the multiple input power supplies, which not only reduces losses but also provides basic isolation through the characteristics of Schottky diodes, preventing backflow of current from each input power supply. Alternatively, the aggregation module can use MOSFETs to aggregate the multiple input power supplies, achieving unidirectional conduction by controlling the MOSFETs' on / off state. By using an aggregation module to merge multiple input power supplies into a single output, replacing the traditional independent circuit design for multiple input power supplies, the cost and size should not increase exponentially with the number of input power supplies. It must meet the requirements of multiple power supply inputs while effectively controlling size and cost. Furthermore, the aggregation module can reduce unnecessary power losses during power conversion, improving charging efficiency.

[0028] This invention places the conversion module at the output of the aggregation module to convert the voltage of a single output, such as by stepping down or dividing the voltage, so that the final output target voltage matches the voltage of the rechargeable battery to be charged. Figure 1 As shown, this conversion module is a step-down DC / DC converter. It also employs a feedback loop to monitor the output voltage in real time and dynamically adjusts the converter's operating state using voltage divider resistors to achieve constant voltage output. This feedback loop ensures stable output voltage, unaffected by diode voltage drop or input fluctuations.

[0029] Existing multi-power charging devices, in order to reduce costs, generally only use parallel diodes without dynamic detection of the number of input channels, resulting in fixed current distribution. While some products use MCUs or dedicated ICs to detect input status for detection purposes, this is costly and difficult to popularize. This invention uses a detection module connected to the input module to monitor the validity of the number of input channels in real time and output a channel count signal. The detection module of this invention includes a power input detection unit and a logic processing unit. Each input power source is connected to a power input detection unit, which detects the energized or de-energized state of the input power source and sends the obtained power status signal to the logic processing unit. The logic processing unit processes the signal and outputs a power supply status signal. By monitoring the number of input channels in real time and dynamically adjusting the charging current according to the number of channels, adaptive distribution of input power is achieved, maximizing the utilization of multiple input power sources and thus improving charging efficiency.

[0030] The power input detection unit can be implemented using a voltage divider resistor and a voltage comparator. First, the input voltage is reduced to a comparable range using the voltage divider resistor. Then, the voltage comparator compares the divided voltage with a reference voltage to determine the validity of the power supply. Alternatively, optocoupler isolation can be used to detect the input power supply status. When a certain input is valid, the optocoupler conducts and outputs a signal. Another method is current detection, which determines the validity of the power supply by detecting the current of each input. If the current of a certain input exceeds a threshold, the power supply is considered valid.

[0031] This logic processing unit can be a microcontroller or a logic gate circuit. It can process data to determine how many power sources are currently supplying power.

[0032] The control module of this invention is connected between the conversion module and the detection module. Based on the output signal of the effective input channels sent by the detection module, it dynamically adjusts the gain of the amplifier circuit and, combined with the current feedback from the conversion module, regulates the output voltage of the control module to ensure it remains at the reference voltage set by the conversion module, thereby achieving a constant charging current output, i.e., constant current charging of the rechargeable battery. Figure 5 The control module shown includes an analog switch, a resistor network, and an operational amplifier. The input of the analog switch is connected to the output of the detection module, and the resistor network is connected to the output of the analog switch. The feedback resistor in the resistor network is selected based on the output signal from the detection module. The operational amplifier adjusts its output voltage according to the selected feedback resistor and the current feedback from the conversion module, maintaining the output voltage of the operational amplifier at the reference voltage set by the buck DC / DC converter chip to ensure a constant charging current. Alternatively, the gain of the operational amplifier can be changed using digital potentiometer control, MOSFET-based variable resistor control, and multi-stage amplifier circuit switching.

[0033] The following is a detailed description with reference to specific embodiments.

[0034] like Figures 2-5 As shown, the multi-channel adaptive constant voltage and constant current charging device of this embodiment includes an input module, a summarizing module, a conversion module, a detection module, and a control module.

[0035] The input module consists of four input power supplies (DC1-DC4) with the same rated voltage and limited power. The aggregation module includes Schottky diodes, with each input power supply output connected to a Schottky diode. By connecting the four input power supplies in parallel and utilizing the unidirectional conduction and dynamic isolation of the Schottky diodes, the four input power supplies are aggregated into a single DCx power supply output to the conversion module. The conversion module in this embodiment includes a buck DC / DC converter chip U42 and a feedback loop. The single-output DCx power supply from the aggregation module is connected to the VIN pin of the buck DC / DC converter chip U42. The buck DC / DC converter chip U42 steps down the received voltage to the target voltage and then sends it to the rechargeable battery interface J8 to charge the rechargeable battery. The feedback loop in this embodiment includes two acquisition resistors, R149 and R160. Acquisition resistor R149 is connected between the voltage output terminal of the buck DC / DC converter chip and the FB pin, while acquisition resistor R160 is connected between the FB pin and ground. The step-down DC / DC converter chip U42 has a reference voltage. When the voltage received at the FB pin is less than the reference voltage, power conversion is initiated. That is, U42 increases the output voltage by increasing the on-time (duty cycle) of the switching transistor. When the voltage received at the FB pin is greater than the reference voltage, the output voltage is reduced. The system continuously adjusts the output voltage to stabilize it near the set value, achieving dynamic balance, or constant voltage control.

[0036] like Figure 2As shown, the conversion module in this embodiment also includes a voltage divider circuit. This voltage divider circuit is connected between the single-channel output terminal of the aggregation module and the buck DC / DC converter chip U42, and is used to divide the voltage of the single-channel output to obtain the minimum system startup voltage. Specifically, resistors R130 and R156 are connected in series to form a voltage divider circuit, which proportionally reduces the high voltage DCx input to the buck DC / DC converter chip U42 to a detectable minimum system startup voltage (V_min), with the formula: V_min = DCx × (R156 / (R130 + R156)). The divided minimum system startup voltage (V_min) is input to the enable pin (EN) of the buck DC / DC converter chip U42 for threshold comparison. If the minimum system startup voltage is greater than or equal to the system-set voltage threshold, the input voltage is determined to be sufficient, and the system starts working; if the minimum system startup voltage is less than the system-set voltage threshold, the input voltage is determined to be too low, and the system is prohibited from starting. For example, assuming R130 = 100kΩ, R156 = 10kΩ, and DCx = 40V, the minimum system startup voltage is: V_min = 40V × (10k / (100k + 10k)) ≈ 3.64V. If the set voltage threshold is 1.5V, then the system will stop working when DCx drops to approximately 1.5V × (110k / 10k) = 16.5V. Generally, the minimum system startup voltage will fall below the threshold when the input power supply experiences a sudden voltage drop due to a fault or load change. Therefore, controlling system startup / shutdown through threshold comparison can prevent the system from starting under insufficient voltage, thus preventing risks such as reverse battery discharge and converter failure.

[0037] The detection module in this embodiment includes a power input detection unit and a logic processing unit. The power input detection unit includes voltage divider resistors, a voltage comparator, and pull-up resistors. The voltage divider resistors are connected to the output terminals of each power supply, such as... Figure 3 As shown in the figure, the input power supply DC1 divides the output voltage of the input power supply through voltage divider resistors R167 and R164 to obtain a low voltage, which is then fed to the non-inverting input of a voltage comparator. The inverting input of the voltage comparator is connected to the Vref reference voltage. The low voltage is compared with the Vref reference voltage. If it is greater than the Vref reference voltage, the power supply is considered to be powered; if it is less than the Vref reference voltage, the power supply is considered to be de-energized. Then, the status signal DC1_EN of the power supply is output to the logic processing unit. Figure 3 Only the detection circuit for one of the input power supplies is shown. In reality, the system needs as many detection circuits as there are input power supplies. The detection circuits for the other three input power supplies in this embodiment are similar. A pull-up resistor R165 is connected to the output of this detection circuit. Its function is to ensure that the DC1_EN signal is stably high when valid, so that it can be read by the logic processing unit and to prevent logic errors.

[0038] like Figure 4 As shown, the logic processing unit includes a logic microcontroller U46. The status signals DC1_EN—DC4_EN from the four input power supplies are sent to the logic microcontroller U46. Through logical judgment and processing, it can determine how many power supplies are currently providing normal power, and then issue the corresponding power supply status signal. The logic microcontroller U46 has four output terminals, PWR_1—PWR_4. One of these four output terminals outputs a signal. If only one power supply is providing normal power, PWR_1 outputs a power supply status signal, and so on. If all four power supplies are providing normal power, PWR_4 outputs a power supply status signal.

[0039] The control module of this embodiment includes an analog switch U44, a resistor network, and an operational amplifier U43. The input terminals IN1-IN4 of the analog switch U44 are connected to the four output terminals PWR_1-PWR_4 of the logic microcontroller U46, respectively. The output side of the analog switch U44 has four NO terminals NO1-NO4 and four COM terminals COM1-COM4. The resistor network of this embodiment consists of resistor R162 and resistors R157, R159, R161, and R163, wherein resistor R... R157, R159, R161, and R163 are connected sequentially to the four NO terminals NO1-NO4. When Inx receives a power supply status signal, it controls the corresponding NOx and COMx to conduct. Then, based on the corresponding feedback resistor (Rx), R162, and operational amplifier U43, a programmable gain amplifier circuit is formed to change the amplification factor, i.e., the gain. The formula is: Gain = 1 + R162 / Rx, where Rx is one of resistors R157, R159, R161, and R163. For example, if three power supplies are normally powered, PWR_3 outputs a power supply status signal. The input terminal IN3 of analog switch U44 receives the power supply status signal and controls NO3 and COM3 to conduct. At this time, the programmable gain amplifier circuit is formed by R162, R161, and operational amplifier U43, so its gain = 1 + R162 / R161. Pin 3 of the operational amplifier U43 samples the voltage generated by the charging current across resistor R154. R154 is a current sampling resistor connected to the conversion module. When the charging current (Ic) flows through R154, it generates a voltage drop V. 154 =Ic×R154, the programmable gain amplifier circuit adjusts the gain based on this voltage drop to form the amplified output voltage. ,Right now =Voltage drop V154 × Gain = Ic × R154 × (1 + R162 / Rx), therefore, the four input power supplies in this embodiment determine four different dynamic charging currents, namely: When only one power source is available: =Ic*R154*(1+R162 / R157); When power is supplied from two sources: =Ic*R154*(1+R162 / R159); When there are three power supplies: =Ic*R154*(1+R162 / R161); When power is supplied from four sources: =Ic*R154*(1+R162 / R163).

[0040] This control module has a constant current control function, specifically: it controls the output voltage of D60. The output is sent to the feedback pin (FB) of the buck DC / DC converter chip U42 and compared with the reference voltage set by the buck DC / DC converter chip. If the actual voltage is... If the reference voltage is less than the specified value, the buck DC / DC converter chip U42 will increase the charging current Ic, thereby... Increase; if the actual The reference voltage reduces the charging current Ic of the buck DC / DC converter chip U42, thereby... Reduce, eventually make The voltage is kept constant relative to the reference voltage, thus maintaining a constant charging current Ic, achieving constant current charging of the battery. From the above formula, the formula for the dynamic charging current Ic can be derived: , and when When the voltage equals the reference voltage, then the constant charging current at this time... .

[0041] The complete workflow of the multi-channel adaptive constant voltage and constant current charging device of the present invention is as follows: 1. Input stage: Multiple power supplies (such as 4 DC 40V) are combined into a single channel (DCx) through Schottky diodes, with a total power of 40W.

[0042] 2. Detection phase: The power input detection unit determines the number of currently valid input channels (e.g., 3 channels) and outputs the PWR_3 signal.

[0043] 3. Conversion and Control Stage: The step-down DC / DC converter chip U42 steps down DCx to 27V (assuming the rechargeable battery's rated input is DC27V / 7AH), while the feedback loop stabilizes the output voltage through voltage divider resistors. The control module dynamically adjusts the resistor network (R161) based on the PWR_3 signal. Limit the charging current Ic to a set value (e.g., 3A).

[0044] 4. Output stage: The stabilized voltage and current charge the battery through the battery interface J8 until it is fully charged.

[0045] In the above workflow, if the number of input channels changes (e.g., from 3 to 2), the power input detection unit updates the PWR signal in real time, and the control module automatically reduces the upper limit of the charging current to achieve linear matching between the number of input channels and the charging current.

[0046] This invention achieves efficient integration and intelligent control of multiple power sources through modular design: the aggregation module addresses cost and size issues; the detection and control modules jointly improve efficiency and stability; and the dynamic adjustment mechanism of the control module ensures constant voltage and constant current output under different input conditions. The coordinated operation of these modules makes this charging device superior to existing technologies in terms of scalability, efficiency, and stability.

[0047] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0048] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this application. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A multi-channel adaptive constant voltage and constant current charging device, characterized in that, include: The input module includes multiple input power supplies with the same rated voltage and limited power; The aggregation module is connected to the output terminals of each input power supply of the input module and is used to combine multiple input power supplies into a single output. The conversion module, connected to the output of the summarizing module, is used to convert the voltage of a single output into a target voltage and achieve constant voltage output through a feedback loop; The detection module, connected to the input module, is used to detect and determine the number of valid input power sources and output a signal. The control module dynamically adjusts the gain of the amplifier circuit based on the output signal of the detection module, and combines this with the current feedback adjustment of the conversion module to achieve a constant charging current output.

2. The multi-channel adaptive constant voltage and constant current charging device according to claim 1, characterized in that, The aggregation module includes a Schottky diode, and each input power supply output terminal is connected to one of the Schottky diodes. By connecting multiple input power supplies in parallel and using the unidirectional conduction and dynamic isolation of the Schottky diodes, multiple input power supplies are aggregated into a single output.

3. The multi-channel adaptive constant voltage and constant current charging device according to claim 1, characterized in that, The conversion module includes a step-down DC / DC converter chip and a feedback loop; the single output terminal of the aggregation module is connected to the step-down DC / DC converter chip, which steps down the received voltage to the target voltage and then delivers it to the rechargeable battery; the feedback loop is connected between the output pin and the FB pin of the step-down DC / DC converter chip, and is used to collect the voltage output to the rechargeable battery in real time and feed it back to the FB pin to achieve constant voltage control.

4. The multi-channel adaptive constant voltage and constant current charging device according to claim 3, characterized in that, The feedback loop includes two acquisition resistors. One acquisition resistor is connected between the voltage output terminal of the buck DC / DC converter chip and the FB pin, and the other acquisition resistor is connected between the FB pin and ground. When the voltage received by the FB pin is less than the reference voltage set by the buck DC / DC converter chip, the output voltage is increased; when the voltage received by the FB pin is greater than the reference voltage, the output voltage is decreased, and finally, dynamic balance is achieved.

5. The multi-channel adaptive constant voltage and constant current charging device according to claim 3, characterized in that, The conversion module also includes a voltage divider circuit, which is connected between the summing module and the buck DC / DC converter chip to divide the voltage of the single output to obtain the minimum startup voltage of the system.

6. The multi-channel adaptive constant voltage and constant current charging device according to claim 5, characterized in that, The minimum system startup voltage is input to the enable pin of the buck DC / DC converter chip for detection and judgment; if the minimum system startup voltage is greater than or equal to the system's set voltage threshold, the system starts working; if the minimum system startup voltage is less than the system's set voltage threshold, the system is prohibited from starting.

7. The multi-channel adaptive constant voltage and constant current charging device according to claim 1, characterized in that, The detection module includes a power input detection unit and a logic processing unit. Each input power supply is connected to the power input detection unit. The power input detection unit is used to detect the power-on or power-off state of the input power supply and transmits the obtained power status signal to the logic processing unit. The logic processing unit processes the signal and outputs a power supply status signal.

8. The multi-channel adaptive constant voltage and constant current charging device according to claim 7, characterized in that, The power input detection unit includes a voltage divider resistor, a voltage comparator, and a pull-up resistor. The voltage divider resistor is connected to the output terminal of each power supply and is used to divide the output voltage and then output it to the non-inverting input of the voltage comparator. The inverting input of the voltage comparator is connected to a reference voltage. The power status signal is output after comparing the voltages at the non-inverting input and the inverting input. The pull-up resistor is connected to the output terminal of the voltage comparator and is used to stabilize the high-level power status signal for the logic processing unit to read.

9. The multi-channel adaptive constant voltage and constant current charging device according to claim 1, characterized in that, The control module includes an analog switch, a resistor network, and an operational amplifier. The input terminal of the analog switch is connected to the output terminal of the detection module, and the resistor network is connected to the output terminal of the analog switch. The feedback resistor in the resistor network is switched according to the output signal of the detection module. The operational amplifier performs calculations and adjustments based on the selected feedback resistor and the current feedback of the conversion module, so that the output voltage of the operational amplifier is maintained at the reference voltage set by the buck DC / DC conversion chip, thereby keeping the charging current constant.

10. The multi-channel adaptive constant voltage and constant current charging device according to claim 9, characterized in that, The conversion module includes a current sampling resistor. The operational amplifier acquires the voltage across the current sampling resistor and then calculates the dynamic charging current Ic using a formula: ,in The output voltage of the operational amplifier is adjusted through operation. It is equal to the reference voltage set by the buck DC / DC converter chip; R154 is the resistance value of the current sampling resistor; R162 is the resistance value of the fixed feedback resistor in the dynamic amplifier circuit; The resistance value of the feedback resistor is dynamically switched by the analog switch according to the output signal of the detection module.

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