A control line that can handle high current

Abstract

This utility model discloses a control line capable of handling high current, comprising an input line, an output line, a display unit, and a control circuit. The control circuit includes a logic control chip, an electronic switch circuit, a current detection circuit, and a temperature detection circuit. The logic control chip is connected to the electronic switch circuit, the current detection circuit, the temperature detection circuit, and the display unit, respectively. The electronic switch circuit is also connected to the current detection circuit, the input line, and the output line, respectively. This utility model effectively solves the reliability and safety problems of low-voltage, high-current electrical equipment, enabling real-time monitoring of current and temperature, as well as current and power regulation.

Description

Technical Field

[0001] This utility model relates to the field of power transmission technology, specifically to a control line that can handle large currents. Background Technology

[0002] With the continuous development of new energy technologies, the application scenarios of energy storage lithium battery packs are becoming increasingly widespread, especially low-voltage lithium battery packs, which are becoming increasingly popular in various devices. Under the same power demand, due to the lower voltage of low-voltage lithium battery packs (such as around 24V), the current required for power supply is often larger, typically reaching tens or even hundreds of amperes.

[0003] However, most existing electrical wires on the market currently lack real-time monitoring capabilities, making it impossible to monitor and adjust key parameters such as current and temperature during transmission. In high-current transmission scenarios, if the wires are aging, have poor contact, or are made of non-standard materials, they are highly susceptible to overheating, potentially causing fires and other safety accidents, severely impacting the reliability and safety of electrical equipment. For example, when trucks are powered by large-capacity lithium batteries, drivers require high currents for operations such as cooking, cooling, and heating. Ordinary connecting wires, lacking monitoring and protection functions, pose a significant safety hazard.

[0004] Therefore, there is an urgent need for a high-current control line with real-time monitoring, active adjustment and safety protection functions to solve the safety problems of low-voltage high-current electrical equipment. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a control line that can handle high current, thereby solving the reliability and safety issues of low-voltage, high-current electrical equipment and enabling real-time monitoring of current and temperature, as well as current and power regulation.

[0006] The technical solution of this utility model is as follows: A control line capable of handling high current includes an input line, an output line, a display unit, and a control circuit. The control circuit includes a logic control chip, an electronic switch circuit, a current detection circuit, and a temperature detection circuit. The logic control chip is connected to the electronic switch circuit, the current detection circuit, the temperature detection circuit, and the display unit, respectively. The electronic switch circuit is also connected to the current detection circuit, the input line, and the output line, respectively.

[0007] In a preferred embodiment of this utility model, the electronic switch circuit includes switching transistors U6, U7, U8, U9, and U10, resistors R5, R6, R7, R8, R9, R10, R11, R12, and R13, a heating film J1, and a connector J2. The first end of switching transistor U8 is connected to the corresponding pin of the logic control chip. The second end of switching transistor U8, after passing through resistor R5, is connected to the first pin of the heating film J1, the first pin of the connector J2, and the power supply voltage. The third end of switching transistor U8 is connected to one end of resistors R6, R8, R9, and R10. The other end of resistor R6 is connected to the first end of switching transistor U10 and one end of resistor R7. The second end of switching transistor U10 is connected to the switching transistor U6... The second terminal of the circuit is connected to the second terminal of the switching transistor U9, the second terminal of the switching transistor U7, the second pin of the heating film J1, and the second pin of the connector J2. The first terminal of the switching transistor U6 is connected to the other end of the resistor R8 and one end of the resistor R11, respectively. The first terminal of the switching transistor U9 is connected to the other end of the resistor R9 and one end of the resistor R12, respectively. The first terminal of the switching transistor U7 is connected to the other end of the resistor R10 and one end of the resistor R13, respectively. The third terminal of the switching transistor U10, the third terminal of the switching transistor U6, the third terminal of the switching transistor U9, the third terminal of the switching transistor U7, the other end of the resistor R7, the other end of the resistor R11, the other end of the resistor R12, and the other end of the resistor R13 are all connected to the detection terminal of the current detection circuit. The third and fourth pins of the connector J2 are connected to the output line and the input line, respectively.

[0008] In a preferred embodiment of this utility model, the current detection circuit includes a current detection chip U1, resistors R2, R3, R4, R25, R26, R27, and R28, and capacitors C3, C4, C5, and C6. The first pin of the current detection chip U1 is connected to one end of resistor R26 and one end of capacitor C3. The other end of resistor R26 is connected to one end of resistor R2, one end of resistor R3, one end of resistor R4, the third terminal of switching transistor U10, the third terminal of switching transistor U6, the third terminal of switching transistor U9, and the third terminal of switching transistor U7. The second pin of the current detection chip U1 is connected to the other end of resistor R2 and the other end of resistor R3. The other end of resistor R4 and one end of resistor R25 are grounded. The third pin of the current detection chip U1 is connected to the other end of resistor R25, the other end of capacitor C3, one end of resistor R29, and one end of capacitor C6, respectively. The fourth pin of the current detection chip U1 is connected to the other end of resistor R29, the other end of capacitor C6, one end of resistor R27, and one end of resistor R28, respectively. The other end of resistor R27 is connected to one end of capacitor C4 and the corresponding pin of the logic control chip, respectively. The other end of resistor R28 and the other end of capacitor C4 are grounded. The fifth pin of the current detection chip U1 is connected to one end of capacitor C5 and the operating voltage, respectively. The other end of capacitor C5 is grounded.

[0009] In a preferred embodiment of this utility model, the temperature detection circuit includes a thermistor RT, resistors R21 and R22, capacitors C30 and C33. One end of the thermistor RT is connected to the operating voltage, and the other end of the thermistor RT is connected to one end of resistor R21, one end of resistor R22, and one end of capacitor C30. The other end of resistor R21 is connected to one end of capacitor C31 and the corresponding pin of the logic control chip. The other ends of resistor R22, capacitor C30, and capacitor C31 are grounded.

[0010] As a preferred embodiment of this utility model, the control circuit further includes a power level indicator circuit, which is connected to the logic control chip.

[0011] As a preferred embodiment of this utility model, the power level indicator circuit includes LED indicator D1, LED indicator D2, LED indicator D3, LED indicator D9, resistors R1, R14, R15, and R16. LED indicator D1 is connected to the corresponding pin of the logic control chip through resistor R14, LED indicator D2 is connected to the corresponding pin of the logic control chip through resistor R15, LED indicator D3 is connected to the corresponding pin of the logic control chip through resistor R16, and LED indicator D9 is connected to the corresponding pin of the logic control chip through resistor R1.

[0012] In a preferred embodiment of this utility model, the control circuit further includes a function adjustment button circuit, which is connected to the logic control chip.

[0013] As a preferred embodiment of this utility model, the function adjustment button circuit includes a power increase button circuit, a power decrease button circuit, and a power on / off button circuit, wherein the power increase button circuit, the power decrease button circuit, and the power on / off button circuit are respectively connected to the corresponding pins of the logic control chip.

[0014] As a preferred embodiment of this utility model, the logic control chip is model PT32Y003.

[0015] As a preferred embodiment of this utility model, the display unit is a TFT display screen.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. The transmission current and temperature are detected in real time through the current detection circuit and temperature detection circuit. The logic control chip dynamically adjusts the current or cuts off the transmission through the electronic switch circuit based on the detection data. Combined with the overcurrent and overtemperature protection mechanism, it effectively avoids the risk of overheating and overload in high current transmission and can eliminate the overheating problem caused by insufficient current carrying capacity of non-standard wires, reducing safety hazards from the source and ensuring the safety of electrical equipment. 2. The display unit displays information such as the power level of the control line, ambient temperature, temperature of the electrical equipment, input wires, current and voltage of the input wires in real time. 3. The power on / off control and power level adjustment are achieved through the function adjustment button circuit, improving the human-computer interaction experience; 4. Suitable for connecting low-voltage, high-current devices, such as truck parking air conditioners and car electric blankets. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, 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 these drawings without creative effort.

[0018] Figure 1 This is a block diagram illustrating the principle of a control line capable of handling large currents in one embodiment of the present invention. Figure 2 This is a circuit diagram of a logic control chip in one embodiment of the present invention; Figure 3 This is a circuit diagram of an electronic switch circuit in one embodiment of the present invention; Figure 4 This is a circuit diagram of the current detection circuit in one embodiment of the present invention; Figure 5 This is a circuit diagram of a temperature detection circuit in one embodiment of the present invention; Figure 6 This is a block diagram illustrating the principle of a control line capable of handling large currents in another embodiment of this utility model. Figure 7 This is a circuit diagram of the power level indicator circuit connected to the logic control chip in one embodiment of the present invention; Figure 8 This is a circuit diagram of the function adjustment button circuit in one embodiment of the present invention. Detailed Implementation

[0019] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be noted that similar reference numerals and letters in the following drawings indicate similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. It is also declared that the embodiments described below are only for explaining this utility model and are not intended to limit this utility model.

[0020] It should be noted that the terms "installation", "setup", "connection", and "fixation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal connection of two components or the interaction between two components, unless otherwise explicitly defined.

[0021] Please see Figure 1 , Figure 2An embodiment of this utility model provides a control line that can handle large currents, including an input line 1, an output line 2, a display unit 3, and a control circuit 4. The control circuit 4 includes a logic control chip 41, an electronic switch circuit 42, a current detection circuit 43, a temperature detection circuit 44, and a function adjustment button circuit 45. The logic control chip 41 is connected to the electronic switch circuit 42, the current detection circuit 43, the temperature detection circuit 44, the function adjustment button circuit 45, and the display unit 3, respectively. The electronic switch circuit 42 is also connected to the current detection circuit 43, the input line 1, and the output line 2, respectively.

[0022] The logic control chip 41 receives current signals from the current detection circuit 43, temperature signals from the temperature detection circuit 44, and button signals from the function adjustment button circuit 45, and sends corresponding control commands to the electronic switch circuit 42, thereby achieving precise control of the transmitted current and power. The logic control chip 41 has overcurrent and overtemperature protection functions. When the feedback current from the current detection circuit 43 reaches a preset current (e.g., 25A), the logic control chip 41 immediately outputs a command to control the electronic switch circuit 42 to cut off the PWM signal, stopping current transmission and preventing overload burnout of the circuit. When the feedback temperature from the temperature detection circuit 44 reaches a preset temperature (e.g., 100℃), the chip triggers a protection command, cutting off the current through the electronic switch circuit 42 to avoid risks such as insulation melting and short circuits caused by high temperatures. By detecting analog signals (e.g., impedance, voltage) between input line 1 and output line 2, the logic control chip 41 can determine whether the wire is qualified, ensuring that only qualified wires are allowed to conduct current, eliminating overheating problems caused by insufficient current carrying capacity of non-standard wires, and reducing safety hazards from the source. Among them, the logic control chip 41 is model PT32Y003.

[0023] The electronic switch circuit 42 is used to realize current switching and power regulation. According to the instructions of the logic control chip 41, it can achieve precise control of the transmission current and power by adjusting the switch conduction degree (PWM signal duty cycle), adapting to the power requirements of different electrical equipment, and avoiding energy waste or equipment overload caused by fixed current transmission.

[0024] The current detection circuit 43 is used to collect the transmission current in real time and feed back the collected current signal to the logic control chip 41.

[0025] The temperature detection circuit 44 is used to collect the ambient temperature and the temperature of the electrical equipment, and to feed back the collected temperature signal to the logic control chip 41.

[0026] The function adjustment button circuit 45 is used to control the power on / off of the line and adjust the power level.

[0027] Display unit 3 is used to display information such as the power level of the control line, ambient temperature, temperature of the electrical equipment, input wires, and the current and voltage of the input wires in real time. Display unit 3 is a TFT display screen.

[0028] In this embodiment, the transmission current and temperature are detected in real time by the current detection circuit 43 and the temperature detection circuit 44. The logic control chip dynamically adjusts the current or cuts off the transmission based on the detection data through the electronic switch circuit 42. Combined with the overcurrent and overtemperature protection mechanism, the risk of overheating and overload in high current transmission is effectively avoided, and the overheating problem caused by insufficient current carrying capacity of non-standard wires can be eliminated, reducing safety hazards from the source and ensuring the safety of electrical equipment. The display unit 3 displays information such as the power level of the control line, ambient temperature, temperature of the electrical equipment, input wire, current and voltage of the input wire in real time. The function adjustment button circuit 45 realizes the power on / off control and the power level adjustment as needed, improving the human-machine interaction experience. It is suitable for the connection between low-voltage high-current devices, such as truck parking air conditioners and car electric blankets.

[0029] Please see Figure 3 In one embodiment, the electronic switch circuit 42 includes switching transistors U6, U7, U8, U9, and U10, resistors R5, R6, R7, R8, R9, R10, R11, R12, and R13, a heating film J1, and a connector J2. The first terminal of switching transistor U8 is connected to pin 11 of the logic control chip 41. The second terminal of switching transistor U8, after passing through resistor R5, is connected to pin 1 of the heating film J1, pin 1 of the connector J2, and a power supply voltage (e.g., 24V+). The third terminal of switching transistor U8 is connected to one end of resistors R6, R8, R9, and R10. The other end of resistor R6 is connected to the first terminal of switching transistor U10 and one end of resistor R7. The second terminal of switching transistor U10... The first terminal of switch U6 is connected to the second terminal of switch U9, the second terminal of switch U7, the second pin of heating film J1, and the second pin of connector J2, respectively. The first terminal of switch U6 is connected to the other end of resistor R8 and one end of resistor R11, respectively. The first terminal of switch U9 is connected to the other end of resistor R9 and one end of resistor R12, respectively. The first terminal of switch U7 is connected to the other end of resistor R10 and one end of resistor R13, respectively. The third terminal of switch U10, the third terminal of switch U6, the third terminal of switch U9, the third terminal of switch U7, the other end of resistor R7, the other end of resistor R11, the other end of resistor R12, and the other end of resistor R13 are all connected to the detection terminal of current detection circuit 43. The third and fourth pins of connector J2 are connected to output line 2 and input line 1, respectively.

[0030] In this embodiment, the electronic switch circuit 42 adopts a multi-transistor collaborative architecture of switching transistors U6-U10, combined with the voltage divider and current limiting design of resistors R5-R13, which can accurately respond to the PWM signal command of the logic control chip 41 and realize fine adjustment of current on / off and power. By outputting PWM signals with different duty cycles by the logic control chip 41, the conduction degree of switching transistors U6-U10 (such as single transistor conduction, multiple transistors in parallel conduction) can be controlled, and multi-level power output can be realized.

[0031] Please see Figure 4 In one embodiment, the current detection circuit 43 includes a current detection chip U1, resistors R2, R3, R4, R25, R26, R27, R28, capacitors C3, C4, C5, and C6. The first pin of the current detection chip U1 is connected to one end of resistor R26 and one end of capacitor C3. The other end of resistor R26 is connected to one end of resistor R2, one end of resistor R3, one end of resistor R4, the third end of switching transistors U10, U6, U9, and U7. The second pin of the current detection chip U1 is connected to the other end of resistor R2 and the other end of resistor R3. One end of resistor R4, the other end of resistor R25, and one end of resistor R25 are grounded. The third pin of current detection chip U1 is connected to the other end of resistor R25, the other end of capacitor C3, one end of resistor R29, and one end of capacitor C6, respectively. The fourth pin of current detection chip U1 is connected to the other end of resistor R29, the other end of capacitor C6, one end of resistor R27, and one end of resistor R28, respectively. The other end of resistor R27 is connected to one end of capacitor C4 and the 20th pin of logic control chip 41, respectively. The other end of resistor R28 and the other end of capacitor C4 are grounded. The fifth pin of current detection chip U1 is connected to one end of capacitor C5 and the operating voltage, respectively. The other end of capacitor C5 is grounded.

[0032] In this embodiment, the current detection circuit 43, through a combination of multi-resistor voltage division, capacitor filtering, and a dedicated detection chip, can achieve high-precision real-time acquisition of large current transmission processes. Resistors R2, R3, and R4 in the circuit are connected in parallel and grounded to pin 2 of the current detection chip U1. Together with resistor R26, they are connected in series at the detection input to form a voltage divider sampling circuit. This circuit converts the large current signal into a low-voltage analog signal recognizable by the logic control chip 41. Furthermore, the parallel current division by multiple resistors avoids the overheating and aging of a single resistor due to long-term high current carrying capacity, ensuring a stable voltage division ratio and thus improving current detection accuracy.

[0033] Please see Figure 5In one embodiment, the temperature detection circuit 44 includes a thermistor RT, a resistor R21, a resistor R22, a capacitor C30, and a capacitor C33. One end of the thermistor RT is connected to the operating voltage, and the other end of the thermistor RT is connected to one end of the resistor R21, one end of the resistor R22, and one end of the capacitor C30. The other end of the resistor R21 is connected to one end of the capacitor C31 and the 17th pin of the logic control chip 41. The other ends of the resistor R22, the other ends of the capacitor C30, and the other ends of the capacitor C31 are grounded.

[0034] In this embodiment, the temperature detection circuit 44, through the application of the characteristics of a thermistor and the RC filtering design, can accurately collect the temperature signals of the environment and electrical equipment, ensuring that the logic control chip 41 obtains true and accurate temperature data. The thermistor RT has a negative temperature coefficient, and its resistance decreases significantly as the temperature increases. In the circuit, one end of the thermistor RT is connected to the operating voltage, and the other end forms a voltage divider circuit with resistors R21 and R22. When the temperature changes, the change in the resistance of the thermistor RT will directly cause a change in the voltage at the voltage divider node. This voltage signal is transmitted to pin 17 of the logic control chip 41 via resistor R21, realizing a precise conversion between temperature, resistance, and voltage.

[0035] Please see Figure 6 , Figure 7 In one embodiment, the control circuit 4 further includes a power level indicator circuit 46, which is connected to the logic control chip 41. The power level indicator circuit 46 is used to provide feedback to the user in the form of lights to indicate the current power level. Specifically, the power level indicator circuit 46 includes LED indicator D1, LED indicator D2, LED indicator D3, LED indicator D9, resistors R1, R14, R15, and R16. LED indicator D1 is connected to pin 8 of the logic control chip 41 via resistor R14, LED indicator D2 is connected to pin 9 of the logic control chip 41 via resistor R15, LED indicator D3 is connected to pin 10 of the logic control chip 41 via resistor R16, and LED indicator D9 is connected to pin 2 of the logic control chip 41 via resistor R1.

[0036] In this embodiment, LED indicators D1-D4 in the power level indicator circuit 46 are connected to the corresponding pins of the logic control chip 41 through independent resistors R14, R15, R16, and R1, respectively. This allows the logic control chip 41 to precisely control the corresponding LED indicator to light up according to the current power output (i.e., the PWM signal duty cycle). For example, when the power level is 25%, only LED indicator D1 is controlled to light up; when the power level rises to 50%, LED indicators D1 and D2 are lit simultaneously, and so on. This allows users to quickly determine the current power status without relying on complex displays.

[0037] Please see Figure 6 , Figure 8 In one embodiment, the function adjustment button circuit 45 includes a power increase button circuit 451, a power decrease button circuit 452, and a power on / off button circuit 453. The power increase button circuit 451, power decrease button circuit 452, and power on / off button circuit 453 are respectively connected to corresponding pins of the logic control chip 41. The power increase button circuit 451 is used to increase the power level, the power decrease button circuit 452 is used to decrease the power level, and the power on / off button circuit 453 is used to control the power on / off of the circuit.

[0038] Specifically, the power-up button circuit 451 includes a power-up button TP5, one end of which is connected to pin 7 of the logic control chip 41, and the other end of which is grounded. The power-down button circuit 452 includes a power-down button TP1, one end of which is connected to pin 12 of the logic control chip 41, and the other end of which is grounded. The power-on / off button circuit 453 includes a power-on / off button TP2, resistors R17, R19, R20, and R23, capacitors C1 and C2. One end of the power-on / off button TP2 is connected to pin 14 of the logic control chip 41, one end of resistor R20, one end of resistor R23, and one end of capacitor C2. The other end of resistor R20 is connected to pin 12 of the logic control chip 41, one end of resistor R19, and one end of capacitor C1 after passing through resistor R17. The other ends of the power-on / off button TP2, resistor R23, capacitor C2, resistor R19, and capacitor C1 are all grounded.

[0039] In this embodiment, the power-up button TP5 is directly connected to pin 7 of the logic control chip 41, and the power-down button TP1 is directly connected to pin 12 of U4. When the power-up button TP5 is pressed, pin 7 of the logic control chip 41 detects a low-level signal and immediately outputs a power increase command, controlling the electronic switch circuit 42 to increase the PWM signal duty cycle, such as from 25% to 50%. When the power-down button TP1 is pressed, pin 12 of the logic control chip 41 detects a low-level signal and outputs a power decrease command, controlling the electronic switch circuit 42 to decrease the PWM duty cycle. In the power-on / off button circuit 453, capacitors C1 and C2 and resistors R17, R19, R20, and R23 form an RC filter circuit, which can effectively solve the problems of button mechanical bounce and external electromagnetic interference. When the power button TP2 is pressed, capacitor C2 smooths the current fluctuation at the moment the button is closed, preventing multiple high and low level transitions detected on pin 14 of U4 due to bounce (i.e., button bounce), thus preventing false triggering of the power on / off command. The voltage divider effect of resistors R17 and R19 stabilizes the signal voltage between pins 12 and 14 of the logic control chip 41. Capacitor C1 further filters out high-frequency interference in the transmission link, ensuring that the logic control chip 41 recognizes the power on / off command only when the user actively presses the power button TP2, avoiding accidental power-on or power-off of the device due to interference, and ensuring electrical safety.

[0040] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

[0041] The present utility model patent has been described above with reference to the accompanying drawings. Obviously, the implementation of the present utility model patent is not limited to the above-described manner. Any improvements made by adopting the inventive concept and technical solution of the present utility model patent, or the direct application of the inventive concept and technical solution of the present utility model patent to other occasions without modification, are all within the protection scope of the present utility model.

Claims

1. A control line capable of handling large currents, characterized in that, It includes input lines, output lines, a display unit, and a control circuit. The control circuit includes a logic control chip, an electronic switch circuit, a current detection circuit, and a temperature detection circuit. The logic control chip is connected to the electronic switch circuit, the current detection circuit, the temperature detection circuit, and the display unit, respectively. The electronic switch circuit is also connected to the current detection circuit, the input lines, and the output lines, respectively.

2. The control line capable of handling large currents according to claim 1, characterized in that, The electronic switch circuit includes switching transistors U6, U7, U8, U9, and U10, resistors R5, R6, R7, R8, R9, R10, R11, R12, and R13, a heating film J1, and a connector J2. The first terminal of switching transistor U8 is connected to the corresponding pin of the logic control chip. The second terminal of switching transistor U8, after passing through resistor R5, is connected to the first pin of the heating film J1, the first pin of the connector J2, and the power supply voltage. The third terminal of switching transistor U8 is connected to one end of resistors R6, R8, R9, and R10. The other end of resistor R6 is connected to the first terminal of switching transistor U10 and one end of resistor R7. The second terminal of switching transistor U10 is connected to the second terminal of switching transistor U6, the first pin of the connector J2, and the power supply voltage. The second terminal of switch U9, the second terminal of switch U7, the second pin of heating film J1, and the second pin of connector J2 are connected. The first terminal of switch U6 is connected to the other end of resistor R8 and one end of resistor R11, respectively. The first terminal of switch U9 is connected to the other end of resistor R9 and one end of resistor R12, respectively. The first terminal of switch U7 is connected to the other end of resistor R10 and one end of resistor R13, respectively. The third terminals of switch U10, U6, U9, and U7, the other ends of resistors R7, R11, R12, and R13 are all connected to the detection terminal of the current detection circuit. The third and fourth pins of connector J2 are connected to the output line and the input line, respectively.

3. The control line capable of handling large currents according to claim 2, characterized in that, The current detection circuit includes a current detection chip U1, resistors R2, R3, R4, R25, R26, R27, R28, capacitors C3, C4, C5, and C6. The first pin of the current detection chip U1 is connected to one end of resistor R26 and one end of capacitor C3. The other end of resistor R26 is connected to one end of resistor R2, one end of resistor R3, one end of resistor R4, the third terminal of switching transistors U10, U6, U9, and U7. The second pin of the current detection chip U1 is connected to the other end of resistors R2, R3, and R4. The other end of the resistor R25 is grounded. The third pin of the current detection chip U1 is connected to the other end of the resistor R25, the other end of the capacitor C3, one end of the resistor R29, and one end of the capacitor C6. The fourth pin of the current detection chip U1 is connected to the other end of the resistor R29, the other end of the capacitor C6, one end of the resistor R27, and one end of the resistor R28. The other end of the resistor R27 is connected to one end of the capacitor C4 and the corresponding pin of the logic control chip. The other end of the resistor R28 and the other end of the capacitor C4 are grounded. The fifth pin of the current detection chip U1 is connected to one end of the capacitor C5 and the operating voltage. The other end of the capacitor C5 is grounded.

4. The control line capable of handling large currents according to claim 1, characterized in that, The temperature detection circuit includes a thermistor RT, resistors R21 and R22, capacitors C30 and C33. One end of the thermistor RT is connected to the operating voltage. The other end of the thermistor RT is connected to one end of resistor R21, one end of resistor R22, and one end of capacitor C30. The other end of resistor R21 is connected to one end of capacitor C31 and the corresponding pin of the logic control chip. The other ends of resistor R22, capacitor C30, and capacitor C31 are grounded.

5. The control line capable of handling large currents according to claim 1, characterized in that, The control circuit also includes a power level indicator circuit, which is connected to the logic control chip.

6. The control line capable of handling large currents according to claim 5, characterized in that, The power level indicator circuit includes LED indicator D1, LED indicator D2, LED indicator D3, LED indicator D9, resistors R1, R14, R15, and R16. LED indicator D1 is connected to the corresponding pin of the logic control chip through resistor R14, LED indicator D2 is connected to the corresponding pin of the logic control chip through resistor R15, LED indicator D3 is connected to the corresponding pin of the logic control chip through resistor R16, and LED indicator D9 is connected to the corresponding pin of the logic control chip through resistor R1.

7. The control line capable of handling large currents according to claim 1, characterized in that, The control circuit also includes a function adjustment button circuit, which is connected to the logic control chip.

8. The control line capable of handling large currents according to claim 7, characterized in that, The function adjustment button circuit includes a power increase button circuit, a power decrease button circuit, and a power on / off button circuit. The power increase button circuit, the power decrease button circuit, and the power on / off button circuit are respectively connected to the corresponding pins of the logic control chip.

9. The control line capable of handling large currents according to claim 1, characterized in that, The logic control chip is model PT32Y003.

10. The control line capable of handling large currents according to claim 1, characterized in that, The display unit is a TFT display screen.

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