A mobile power intelligent switching charging mode circuit

Abstract

This utility model discloses a circuit for intelligent switching of charging modes for a portable power bank. The portable power bank is connected to a 220V power source via a plug. It charges its built-in battery using a built-in AC-DC circuit. The circuit includes: a current transformer for measuring the current flowing into the circuit from the 220V power source to generate a current signal; a relay connected between the power bank and the 220V power supply line; and a microcontroller that receives the current signal and analyzes its magnitude. When the current signal exceeds a first threshold, the microcontroller controls the relay to connect the power supply line; when the current signal is less than a second threshold, the microcontroller controls the relay to disconnect the power supply line. This utility model enables intelligent switching of charging modes, preventing overcharging of the battery.

Description

Technical Field

[0001] This utility model relates to the field of charging circuit technology, and in particular to a power bank intelligent switching charging mode circuit. Background Technology

[0002] With the widespread use of mobile devices, portable power banks have become an indispensable part of modern life. Traditional power banks typically use a dedicated charger to charge their built-in batteries, while some power banks incorporate AC-DC conversion circuits to directly convert 220V AC power into DC power suitable for battery charging. However, these power banks with built-in charging circuits are prone to overcharging and trickle charging. Overcharging and trickle charging are major factors affecting battery life, especially after the battery is fully charged. Continuing to charge after this not only wastes electricity but can also damage the battery.

[0003] To address these issues, several smart charging technologies have emerged that monitor the battery's state of charge and control the charging process to prevent damage from overcharging. However, these technologies still have limitations in practical applications, such as requiring complex circuit designs, incurring high costs, or only working for specific types of batteries or devices, lacking versatility. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a power bank intelligent switching charging mode circuit.

[0005] To achieve the above objectives, the following solution is adopted: A power bank intelligent switching charging mode circuit is disclosed. The power bank is connected to a 220V power source via a plug, and charges its built-in battery based on a built-in AC-DC circuit. The circuit includes: A current transformer is used to measure the current flowing into the circuit from the 220V power supply to generate a current signal. A relay, which is connected between the power supply line of the mobile power supply and the power supply line of the 220V power supply; A microcontroller receives the current signal and analyzes its magnitude. When the current signal is greater than a first threshold, the microcontroller controls the relay to turn on the power supply line. When the current signal is less than a second threshold, the microcontroller controls the relay to turn off the power supply line.

[0006] Furthermore, a first resistor is connected in parallel across the two ends of the current transformer. The first resistor is used to divide the current signal sensed by the current transformer and transmit it to the sensing port of the microcontroller.

[0007] Furthermore, the circuit also includes a second resistor, one end of which is connected to the first resistor, and the other end of which is connected to the 5V reference port of the microcontroller.

[0008] Furthermore, the common end of the first resistor and the second resistor is also connected to one end of a low-pass filter, which includes a capacitor and a third resistor connected in parallel. The other end of the low-pass filter and the relay are connected to the ground port of the microcontroller.

[0009] By adopting the above solution, the beneficial effects of this utility model are: The circuit of this invention can automatically switch charging modes according to the magnitude of the current signal. When the current signal is greater than a first threshold, the circuit is in charging mode; when the current signal is less than a second threshold, the circuit automatically disconnects the power supply to prevent overcharging and trickle charging, thereby extending the battery's lifespan. This invention also avoids unnecessary charging processes after the battery is fully charged by intelligently controlling the switching state of the relay, thus reducing battery heat loss. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the intelligent switching charging mode circuit for the mobile power supply of this utility model. Detailed Implementation

[0011] 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.

[0012] Reference Figure 1 As shown, this utility model provides a smart charging mode switching circuit for a power bank. The power bank is connected to a 220V power source via a plug, and charges its built-in battery based on a built-in AC-DC circuit. The circuit includes: Current transformer (CT) is used to measure the current flowing into a circuit from a 220V power supply to generate a current signal. Relay 1 is connected between the power supply line of the mobile power supply and the 220V power supply. Microcontroller 2 receives the current signal and analyzes its magnitude. When the current signal is greater than a first threshold, microcontroller 2 controls relay 1 to make the power supply line conduct. When the current signal is less than a second threshold, microcontroller 2 controls relay 1 to make the power supply line disconnect.

[0013] A first resistor R1 is connected in parallel across the two ends of the current transformer CT. The first resistor R1 is used to divide the current signal sensed by the current transformer CT and transmit it to the sensing port of the microcontroller 2.

[0014] The circuit also includes a second resistor R2, one end of which is connected to the first resistor R1, and the other end is connected to the 5V reference port of the microcontroller 2. The first resistor R1 and the second resistor R2 form a voltage divider, and the 5V reference port helps the microcontroller 2 accurately process the input voltage signal.

[0015] The common end of the first resistor R1 and the second resistor R2 is also connected to one end of the low-pass filter 2. The low-pass filter includes a capacitor C connected in parallel and a third resistor R3. The other end of the low-pass filter and the relay 1 are connected to the ground port of the microcontroller 2.

[0016] Working principle: A current transformer (CT) is used to monitor the current flowing into the circuit from a 220V AC power supply. When the battery begins charging, the current is relatively large, and the CT generates a corresponding current signal. This current signal is divided by resistors R1 and R2 and then transmitted to the sensing port of microcontroller 2. This signal passes through a low-pass filter to remove high-frequency noise, ensuring that the signal is transmitted smoothly and accurately to microcontroller 2. Microcontroller 2 compares the received current signal with preset first and second thresholds. When the current signal is greater than the first threshold, it indicates that the battery is still charging normally, and microcontroller 2 controls relay 1 to keep the circuit conducting and continue charging. When the current signal is less than the second threshold, it indicates that the battery charging is complete or the current is too low, entering trickle charging mode. Microcontroller 2 controls relay 1 to disconnect the circuit, stopping battery charging and preventing overcharging. Relay 1 is used to disconnect or connect the power supply line under the control of microcontroller 2, thereby controlling the start and stop of the charging process. The entire power bank automatically determines the battery charging status and intelligently switches charging modes through microcontroller 2. This process requires no manual intervention, ensuring efficient and safe charging.

[0017] The circuit of this invention can automatically switch charging modes according to the magnitude of the current signal. When the current signal is greater than a first threshold, the circuit is in charging mode; when the current signal is less than a second threshold, the circuit automatically disconnects the power supply to prevent overcharging and trickle charging, thereby extending the battery's lifespan. This invention also avoids unnecessary charging processes after the battery is fully charged by intelligently controlling the switching state of the relay, thus reducing battery heat loss.

[0018] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A mobile power intelligent switching charging mode circuit, characterized in that, The power bank is connected to a 220V power source via a plug and charges its built-in battery using a built-in AC-DC circuit, which includes: A current transformer is used to measure the current flowing into the circuit from the 220V power supply to generate a current signal. A relay, which is connected between the power supply line of the mobile power supply and the power supply line of the 220V power supply; A microcontroller receives the current signal and analyzes its magnitude. When the current signal is greater than a first threshold, the microcontroller controls the relay to turn on the power supply line. When the current signal is less than a second threshold, the microcontroller controls the relay to turn off the power supply line.

2. The mobile power intelligent switching charging mode circuit of claim 1, wherein, A first resistor is connected in parallel across the two ends of the current transformer. The first resistor is used to divide the current signal sensed by the current transformer and transmit it to the sensing port of the microcontroller.

3. The mobile power intelligent switching charging mode circuit of claim 2, wherein, The circuit also includes a second resistor, one end of which is connected to the first resistor and the other end of which is connected to the 5V reference port of the microcontroller.

4. The mobile power intelligent switching charging mode circuit of claim 3, wherein, The common end of the first resistor and the second resistor is also connected to one end of a low-pass filter, which includes a capacitor and a third resistor connected in parallel. The other end of the low-pass filter and the relay are connected to the ground port of the microcontroller.

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