Charging power distribution circuit and electronic equipment

Abstract

The utility model discloses a charging power distribution circuit and electronic equipment, and belongs to the technical field of charging. A monitoring circuit detects the current of direct current so as to output a charging control signal; each charging circuit converts the voltage of the direct current into a charging voltage according to the charging control signal; each battery is charged according to each charging voltage, the monitoring circuit only needs to detect the current of the direct current, each charging circuit adjusts the corresponding charging voltage in real time according to the charging control signal, software does not need to participate in distribution in the whole process, and the charging power of the plurality of batteries can be distributed only through hardware. The circuit is short in design research and development period, low in production cost, simple in product and small in size.

Description

Technical Field

[0001] The present application belongs to the field of charging technology, and in particular, relates to a charging power distribution circuit and an electronic device. Background Art

[0002] In a charging base that supports flexible splicing of multiple charging slots, the charging slots can be increased or decreased at any time, and charging devices can be inserted into or removed from the charging slots at any time. Therefore, the number of charging devices cannot be determined, but the power that the power adapter that powers the charging base can provide is certain and limited. Therefore, in order to support as many charging devices as possible, the maximum charging power of each charging slot has to be limited to a lower level, resulting in a long charging time for each charging device even if the number of charging devices actually inserted by the user is small.

[0003] In order to solve the contradiction between the number of charging devices and the charging power, maximize the use of the power supply of the power adapter, and reduce the waiting time for users to charge, intelligent power distribution solutions are usually used in the prior art. Conventional intelligent power distribution solutions generally require software participation, and the central processor collects information, analyzes and calculates, and then issues instructions to control and adjust. It has the problems of long design and development cycle, high production cost, high product complexity and large size. Summary of the invention

[0004] The purpose of this application is to provide a charging power distribution circuit and electronic equipment, aiming to solve the problems of long design and development cycle, high production cost, high product complexity and large size of existing intelligent power distribution solutions.

[0005] The embodiment of the present application provides a charging power distribution circuit, which is connected to a plurality of batteries, including a monitoring circuit and a plurality of charging circuits, wherein the plurality of batteries are connected to the plurality of charging circuits in a one-to-one correspondence;

[0006] The monitoring circuit is configured to detect the current of the direct current to output a charging control signal;

[0007] The charging circuit is connected to the monitoring circuit and is configured to convert the voltage of the DC power into a charging voltage according to the charging control signal;

[0008] The battery is configured to be charged according to the charging voltage.

[0009] In one embodiment, the charging circuit comprises:

[0010] a regulating circuit, connected to the monitoring circuit, and configured to convert the voltage of the direct current into an adjustable voltage based on the charging control signal;

[0011] A DC conversion circuit is connected to the regulating circuit and the battery, and is configured to convert the adjustable voltage into the charging voltage.

[0012] In one embodiment, the regulation circuit includes a DC-DC step-down switching regulator, a diode, a first inductor, a first capacitor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, and a ninth resistor;

[0013] The anode of the diode is used as a charging control signal input terminal of the regulating circuit and is connected to the monitoring circuit to input the charging control signal; the cathode of the diode is connected to the first end of the fifth resistor, the first end of the eighth resistor and the feedback input terminal of the DC-DC buck switching regulator; the second end of the eighth resistor and the first end of the first inductor are used together as an adjustable voltage output terminal of the regulating circuit and are connected to the DC conversion circuit to output the adjustable voltage; the second end of the first inductor is connected to the first end of the first capacitor and the inductor connection terminal of the DC-DC buck switching regulator, the second end of the first capacitor is connected to the first end of the seventh resistor, the second end of the seventh resistor is connected to the bootstrap terminal of the DC-DC buck switching regulator, the enable terminal of the DC-DC buck switching regulator and the power supply terminal of the DC-DC buck switching regulator are used together as the DC input terminal of the regulating circuit to input the DC power, and the second end of the fifth resistor and the ground terminal of the DC-DC buck switching regulator are connected to the power ground.

[0014] In one embodiment, the DC conversion circuit includes a step-down charger, a second inductor, a second capacitor and a ninth resistor;

[0015] The supply voltage end of the buck charger serves as the adjustable voltage input end of the DC conversion circuit, and is connected to the regulation circuit to input the adjustable voltage; the boost converter switch node end of the buck charger is connected to the first end of the second capacitor and the first end of the second inductor, the bootstrap end of the buck charger is connected to the second end of the second capacitor, the second end of the second inductor is connected to the first end of the ninth resistor, and the second end of the ninth resistor serves as the charging voltage output end of the DC conversion circuit, and is connected to the battery to output the charging voltage.

[0016] In one embodiment, the monitoring circuit comprises:

[0017] A sampling circuit configured to sample the current of the direct current and output a sampling signal;

[0018] The signal amplifying circuit is connected to the sampling circuit and is configured to amplify the sampling signal to output the charging control signal.

[0019] In one of the embodiments, the sampling circuit includes a first resistor;

[0020] The first end of the first resistor and the second end of the first resistor serve together as a DC current sampling input end of the sampling circuit and a sampling signal output end of the sampling circuit, and are connected to the signal amplification circuit to access the DC current and output the sampling signal.

[0021] In one embodiment, the signal amplification circuit includes an operational amplifier, a second resistor, a third resistor, and a fourth resistor;

[0022] The first end of the second resistor and the first end of the third resistor serve together as a sampling signal input end of the signal amplifying circuit, and are connected to the sampling circuit to input the sampling signal; the second end of the second resistor is connected to the inverting input end of the operational amplifier and the first end of the fourth resistor, the second end of the third resistor is connected to the non-inverting input end of the operational amplifier, the output end of the operational amplifier and the second end of the fourth resistor serve as a charging control signal output end of the signal amplifying circuit, and are connected to the charging circuit to output the charging control signal; the power ground end of the buck charger is connected to the power ground.

[0023] An embodiment of the present application further provides an electronic device, which includes the above-mentioned charging power distribution circuit.

[0024] Compared with the prior art, the embodiments of the present application have the following beneficial effects: the monitoring circuit detects the current of the direct current to output a charging control signal; the charging circuit converts the voltage of the direct current into a charging voltage according to the charging control signal; the battery is charged according to the charging voltage, and only the monitoring circuit needs to detect the current of the direct current, and each charging circuit adjusts its corresponding charging voltage in real time according to the charging control signal, without the need for software to be involved in the allocation, and the charging power of multiple batteries can be allocated only through hardware. The circuit has a short design and development cycle, low production cost, and a simple and small product. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical application in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 A schematic diagram of a charging power distribution circuit provided in an embodiment of the present application;

[0027] Figure 2 Another structural schematic diagram of a charging power distribution circuit provided in an embodiment of the present application;

[0028] Figure 3 Another structural schematic diagram of a charging power distribution circuit provided in an embodiment of the present application;

[0029] Figure 4 A partial exemplary circuit schematic diagram of a charging power distribution circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0031] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0032] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] Figure 1 The structure diagram of the charging power distribution circuit provided by an embodiment of the present application is shown. For the convenience of explanation, only the part related to the present embodiment is shown, which is described in detail as follows:

[0035] The charging power distribution circuit is connected to a plurality of batteries. The charging power distribution circuit includes a monitoring circuit 10 and a plurality of charging circuits 20 . The plurality of batteries 30 are connected to the plurality of charging circuits 20 in a one-to-one correspondence.

[0036] The monitoring circuit 10 is configured to detect the current of the direct current to output a charging control signal.

[0037] The charging circuit 20 is connected to the monitoring circuit 10 and is configured to convert the voltage of the direct current into a charging voltage according to the charging control signal.

[0038] The battery 30 is configured to be charged according to a charging voltage.

[0039] The negative electrode of the battery 30 is connected to a DC bus bar of the negative electrode, and the DC bus bar is used to transmit direct current.

[0040] The monitoring circuit 10 detects the current of the direct current and changes the voltage of the charging control signal according to the detection result. Each charging circuit 20 adjusts the charging voltage according to the voltage step of the charging control signal until the total charging power is close to the maximum preset power, wherein the total charging power is the sum of the charging powers of each charging circuit 20. If the total charging power does not exceed the maximum preset power, each charging circuit 20 outputs the preset maximum charging voltage and charges the corresponding battery 30 according to the maximum power of a single charging circuit 20; if the total charging power exceeds the maximum preset power, each charging circuit 20 reduces the corresponding charging voltage and charges the corresponding battery 30 according to the maximum total charging power. At this time, if the total charging power is reduced, each charging circuit 20 increases the corresponding charging voltage until the total charging power is still close to the maximum preset power.

[0041] The circuit design development cycle is short, the production cost is low, the product is simple and small in size, and no software is required to participate in power distribution throughout the process. The charging power of multiple batteries 30 is distributed only through hardware, maximizing the use of the total charging power.

[0042] By way of example and not limitation, Figure 2 As shown, the charging circuit 20 includes a regulating circuit 21 and a DC conversion circuit 22 .

[0043] The regulating circuit 21 is connected to the monitoring circuit 10 and is configured to convert the voltage of the direct current into an adjustable voltage based on the charging control signal.

[0044] The DC conversion circuit 22 is connected to the regulation circuit 21 and the battery 30 and is configured to convert the adjustable voltage into a charging voltage.

[0045] Specifically, the preset reference voltage can be determined according to the number of batteries, that is, when the voltage of the charging control signal is the preset reference voltage, the total charging power is closest to the maximum preset power. When the voltage of the charging control signal is lower than the preset reference voltage, the total charging power is less than the maximum preset power, and the regulating circuit 21 outputs the preset maximum charging voltage to charge the corresponding battery 30 according to the maximum charging power of the single charging circuit 20; when the voltage of the charging control signal is higher than the preset reference voltage, the total charging power is higher than the maximum preset power, and the regulating circuit 21 reduces the adjustable voltage, the charging voltage is reduced accordingly, the total charging power is reduced, and the voltage of the charging control signal is reduced step by step until the voltage of the charging control signal is consistent with the preset reference voltage.

[0046] The regulating circuit 21 can output and regulate the charging power of the battery 30 without software control, thereby simplifying the circuit design and reducing the circuit cost.

[0047] By way of example and not limitation, Figure 3 As shown, the monitoring circuit 10 includes a sampling circuit 11 and a signal amplifying circuit 12 .

[0048] The sampling circuit 11 is configured to sample the DC current and output a sampling signal.

[0049] The signal amplifying circuit 12 is connected to the sampling circuit 11 and is configured to amplify the sampling signal to output a charging control signal.

[0050] The sampling signal is amplified by the signal amplifying circuit 12 , thereby increasing the amplitude and strength of the sampling signal and improving the applicability of the monitoring circuit 10 .

[0051] Figure 4 A partial exemplary circuit structure of a charging power distribution circuit provided in an embodiment of the present application is shown. For the sake of convenience, only the part related to the embodiment of the present application is shown, which is described in detail as follows:

[0052] The regulating circuit 21 includes a DC-DC step-down switching regulator U2, a diode D1, a first inductor L1, a first capacitor C1, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8 and a ninth resistor R9.

[0053] The anode of the diode D1 is used as the charging control signal input terminal of the regulating circuit 21, and is connected to the monitoring circuit 10 to input the charging control signal; the cathode of the diode D1 is connected to the first end of the fifth resistor R5, the first end of the eighth resistor R8 and the feedback input terminal FB of the DC-DC step-down switching regulator U2; the second end of the eighth resistor R8 and the first end of the first inductor L1 are used together as the adjustable voltage output terminal of the regulating circuit 21, and are connected to the DC conversion circuit 22 to output the adjustable voltage; the second end of the first inductor L1 is connected to the first end of the first capacitor C1 and the DC -The inductor connection terminal SW of the DC-DC step-down switching regulator U2 is connected, the second end of the first capacitor C1 is connected to the first end of the seventh resistor R7, the second end of the seventh resistor R7 is connected to the bootstrap terminal BST of the DC-DC step-down switching regulator U2, the enable terminal EN of the DC-DC step-down switching regulator U2 and the power supply terminal IN of the DC-DC step-down switching regulator U2 are jointly used as the DC input terminal of the regulation circuit 21 to input DC power, and the second end of the fifth resistor R5 and the ground terminal GND of the DC-DC step-down switching regulator U2 are jointly connected to the power ground.

[0054] The unidirectional conduction characteristic of diode D1 ensures that the adjustable voltage is lower than the voltage of the charging control signal, avoiding the burning of the subsequent circuit due to abnormal feedback regulation or other unexpected factors, thereby improving the safety of the circuit.

[0055] The adjustable voltage is regulated by the working characteristic of the DC-DC step-down switching regulator U2 that negatively feedbacks the output voltage, and the step accuracy of the power regulation is not limited by the accuracy of the resistors in the circuit, but only depends on the accuracy of the feedback reference voltage inside the DC-DC step-down switching regulator U2. This ensures that the system will not overshoot, and the charging power will not oscillate repeatedly during system regulation, thereby eliminating the need to design complex digital control circuits and control through software, thereby achieving the purpose of controlling the charging power with a simple analog circuit, simplifying the design, reducing costs, and improving circuit stability.

[0056] The DC conversion circuit 22 includes a step-down charger U3, a second inductor L2, a second capacitor C2 and a ninth resistor R9.

[0057] The power supply voltage terminal VBUS of the buck charger U3 serves as the adjustable voltage input terminal of the DC conversion circuit 22, and is connected to the regulation circuit 21 to input the adjustable voltage; the boost converter switch node terminal SW of the buck charger U3 is connected to the first end of the second capacitor C2 and the first end of the second inductor L2, the bootstrap terminal BT of the buck charger U3 is connected to the second end of the second capacitor C2, the second end of the second inductor L2 is connected to the first end of the ninth resistor R9, and the second end of the ninth resistor R9 serves as the charging voltage output terminal of the DC conversion circuit 22, and is connected to the battery 30 to output the charging voltage; the power ground terminal PGND of the buck charger U3 is connected to the power ground.

[0058] The circuit is simple and reliable.

[0059] The sampling circuit 11 includes a first resistor R1 .

[0060] The first end of the first resistor R1 and the second end of the first resistor R1 serve together as the DC current sampling input end of the sampling circuit 11 and the sampling signal output end of the sampling circuit 11, and are connected to the positive DC bus and the signal amplification circuit 12 to access the DC current and output the sampling signal.

[0061] The circuit only includes resistors, which is simple and low cost.

[0062] The signal amplifying circuit 12 includes an operational amplifier U1 , a second resistor R2 , a third resistor R3 , and a fourth resistor R4 .

[0063] The first end of the second resistor R2 and the first end of the third resistor R3 serve together as a sampling signal input end of the signal amplifying circuit 12, and are connected to the sampling circuit 11 to input a sampling signal; the second end of the second resistor R2 is connected to the inverting input end IN- of the operational amplifier U1 and the first end of the fourth resistor, the second end of the third resistor R3 is connected to the non-inverting input end IN+ of the operational amplifier U1, the output end OUT of the operational amplifier U1 and the second end of the fourth resistor R4 serve as a charging control signal output end of the signal amplifying circuit 12, and are connected to the charging circuit 20 to output a charging control signal.

[0064] The operational amplifier U1 and the resistors are both common conventional devices, which are easy to obtain and low in cost. The corresponding models can be configured according to actual needs, thereby improving the versatility of the circuit.

[0065] The following is a combination of working principles Figure 4 As shown for further explanation:

[0066] Take three charging circuits 20 and three batteries 30 as an example for explanation. After the power supply is turned on, the power supply terminal IN of the DC-DC buck switching regulator U2 is connected to the DC power, and an adjustable voltage is output from the first end of the first inductor L1. After the adjustable voltage is divided by the fifth resistor R5 and the eighth resistor R8, it is output from the first end of the fifth resistor R5 and the first end of the eighth resistor R8 to the feedback input terminal FB of the DC-DC buck switching regulator U2. The DC-DC buck switching regulator U2 adjusts the adjustable voltage according to the divided adjustable voltage and the feedback reference voltage inside the DC-DC buck switching regulator U2, and outputs the adjusted adjustable voltage to the power supply voltage terminal VBUS of the corresponding buck charger U3. Each buck charger U3 converts the adjustable voltage into a charging voltage (the charging voltage is a preset maximum charging voltage), and outputs it from the boost converter switch node SW of each buck charger U3 to the corresponding battery 30 for charging.

[0067] At the same time, the first resistor R1 samples the DC current, and outputs the sampling signal to the positive input terminal IN+ of the operational amplifier U1 and the inverting input terminal IN- of the operational amplifier U1 through the second end of the second resistor R2 and the second end of the third resistor R3. The operational amplifier U1 amplifies the sampling signal and outputs a charging control signal from the output terminal OUT of the operational amplifier U1 to the positive electrode of each diode D1.

[0068] If the total charging power is less than the maximum preset power at this time, the voltage of the charging control signal is lower than the feedback reference voltage inside the DC-DC step-down switching regulator U2, and each diode D1 is cut off. At this time, the adjustable voltage output by the inductor connection terminal SW of each DC-DC step-down switching regulator U2 remains unchanged, and each step-down charger U3 continues to output the preset maximum charging voltage to the corresponding battery 30 for charging. At this time, charging is performed according to the maximum power of a single charging circuit.

[0069] If the total charging power is greater than the maximum preset power at this time, the voltage of the charging control signal is higher than the feedback reference voltage inside the DC-DC buck switching regulator U2, and each diode D1 is turned on. Each diode D1 outputs a charging control signal from the negative electrode to the feedback input terminal FB of the corresponding DC-DC buck switching regulator U2, and each DC-DC buck switching regulator U2 negatively feedback-adjusts the adjustable voltage according to the voltage of the charging control signal, and outputs the reduced adjustable voltage from the first end of the first inductor L1 to the power supply voltage terminal VBUS of the corresponding buck charger U3, and each buck charger U3 converts the reduced adjustable voltage into a reduced charging voltage, and the charging current of each battery 30 is reduced accordingly, and the voltage of the charging control signal is also reduced, so that the total charging power is close to the maximum preset power by stepping the adjustable voltage. Then, the adjustable voltage output from the inductor connection terminal SW of each DC-DC buck switching regulator U2 no longer changes, and the three buck chargers U3 continue to output the charging voltage to the corresponding battery 30 for charging, and charging is performed at the maximum preset power at this time.

[0070] If the first battery 30 is fully charged or disconnected at this time, the total charging power is reduced, so the voltage of the charging control signal is also reduced, and the other two DC-DC buck switching regulators U2 increase the output adjustable voltage according to the voltage of the charging control signal and the feedback reference voltage inside the DC-DC buck switching regulator U2, and adjust the adjustable voltage in steps so that the total charging power is close to the maximum preset power. Then, the adjustable voltage outputted by the inductor connection terminal SW of the other two DC-DC buck switching regulators U2 is no longer changed, and the second buck charger U3 and the third buck charger U3 respectively convert the current variable voltage into the charging voltage to charge the corresponding battery 30. In the process of the batteries 30 being fully charged or disconnected one by one, the above-mentioned power distribution adjustment process is continuously repeated until the final total charging power is less than the maximum preset power, the charging voltage outputted by all charging circuits 20 is no longer limited, and then all batteries 30 are fully charged.

[0071] An embodiment of the present application also provides an electronic device, which includes the above-mentioned charging power distribution circuit.

[0072] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0073] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A charging power distribution circuit connected to a plurality of batteries, characterized in that: It includes a monitoring circuit and a plurality of charging circuits, wherein the plurality of batteries are connected to the plurality of charging circuits in a one-to-one correspondence; The monitoring circuit is configured to detect the current of the direct current to output a charging control signal; The charging circuit is connected to the monitoring circuit and is configured to convert the voltage of the DC power into a charging voltage according to the charging control signal; The battery is configured to be charged according to the charging voltage.

2. The charging power distribution circuit according to claim 1, characterized in that: The charging circuit comprises: a regulating circuit, connected to the monitoring circuit, and configured to convert the voltage of the direct current into an adjustable voltage based on the charging control signal; A DC conversion circuit is connected to the regulating circuit and the battery, and is configured to convert the adjustable voltage into the charging voltage.

3. The charging power distribution circuit according to claim 2, characterized in that: The regulating circuit includes a DC-DC step-down switching regulator, a diode, a first inductor, a first capacitor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor and a ninth resistor; The anode of the diode is used as a charging control signal input terminal of the regulating circuit and is connected to the monitoring circuit to input the charging control signal; the cathode of the diode is connected to the first end of the fifth resistor, the first end of the eighth resistor and the feedback input terminal of the DC-DC buck switching regulator; the second end of the eighth resistor and the first end of the first inductor are used together as an adjustable voltage output terminal of the regulating circuit and are connected to the DC conversion circuit to output the adjustable voltage; the second end of the first inductor is connected to the first end of the first capacitor and the inductor connection terminal of the DC-DC buck switching regulator, the second end of the first capacitor is connected to the first end of the seventh resistor, the second end of the seventh resistor is connected to the bootstrap terminal of the DC-DC buck switching regulator, the enable terminal of the DC-DC buck switching regulator and the power supply terminal of the DC-DC buck switching regulator are used together as the DC input terminal of the regulating circuit to input the DC power; the second end of the fifth resistor and the ground terminal of the DC-DC buck switching regulator are connected to the power ground.

4. The charging power distribution circuit according to claim 2, characterized in that: The DC conversion circuit includes a step-down charger, a second inductor, a second capacitor and a ninth resistor; The supply voltage terminal of the buck charger serves as the adjustable voltage input terminal of the DC conversion circuit, and is connected to the regulation circuit to input the adjustable voltage; the boost converter switch node terminal of the buck charger is connected to the first end of the second capacitor and the first end of the second inductor, the bootstrap terminal of the buck charger is connected to the second end of the second capacitor, the second end of the second inductor is connected to the first end of the ninth resistor, and the second end of the ninth resistor serves as the charging voltage output terminal of the DC conversion circuit, and is connected to the battery to output the charging voltage; the power ground terminal of the buck charger is connected to the power ground.

5. The charging power distribution circuit according to claim 1, characterized in that: The monitoring circuit comprises: A sampling circuit configured to sample the current of the direct current and output a sampling signal; The signal amplifying circuit is connected to the sampling circuit and is configured to amplify the sampling signal to output the charging control signal.

6. The charging power distribution circuit according to claim 5, characterized in that: The sampling circuit includes a first resistor; The first end of the first resistor and the second end of the first resistor serve together as a DC current sampling input end of the sampling circuit and a sampling signal output end of the sampling circuit, and are connected to the signal amplification circuit to access the DC current and output the sampling signal.

7. The charging power distribution circuit according to claim 5, characterized in that: The signal amplifying circuit includes an operational amplifier, a second resistor, a third resistor and a fourth resistor; The first end of the second resistor and the first end of the third resistor serve together as a sampling signal input end of the signal amplifying circuit, and are connected to the sampling circuit to input the sampling signal; the second end of the second resistor is connected to the inverting input end of the operational amplifier and the first end of the fourth resistor, the second end of the third resistor is connected to the non-inverting input end of the operational amplifier, and the output end of the operational amplifier and the second end of the fourth resistor serve together as a charging control signal output end of the signal amplifying circuit, and are connected to the charging circuit to output the charging control signal.

8. An electronic device, characterized in that: Comprising the charging power distribution circuit as described in any one of claims 1 to 7.

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