Bidirectional charging detection wire rod

Abstract

A bidirectional charging detection wire rod comprises a charging loop, the charging loop comprises a first interface, a second interface, a power line and a reference line, the power line is connected between a power terminal of the first interface and a power terminal of the second interface, the reference line is connected between a grounding terminal of the first interface and a grounding terminal of the second interface, and the bidirectional charging detection wire rod further comprises a detection resistor R1, the detection resistor R1 is arranged on a reference line, and the first end of the detection resistor R1 is connected with a grounding end; the main control circuit is used for detecting the first voltage and judging the direction of the charging current according to the first voltage; and the voltage division circuit is used for converting the first voltage into the second voltage. Compared with the prior art, the embodiment of the utility model adopts a single detection resistor design, so that the problem of internal resistance increase caused by a plurality of detection resistors in the prior art is effectively avoided, and the charging efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to charging technical field, concretely relates to a bidirectional charging detection wire rod. BACKGROUND

[0002] With the continuous development of electronic equipment technology, Type-C interface gradually becomes mainstream interface because of its advantages such as supporting positive and negative plugging, fast transmission speed, strong compatibility, etc., to meet the needs of users for convenience and unification, more and more wire rods on the market adopt the design that both ends are Type-C interfaces, such wire rod not only supports forward charging, but also supports reverse charging, greatly improving the applicability of wire rod.

[0003] The existing double-end Type-C wire rod realizes current detection by increasing multiple detection resistors, which can cause the increase of internal resistance and the reduction of charging efficiency, and the use of operational amplifier circuit makes the design complicated, increases the cost and power consumption, and can also cause heat accumulation problem in fast charging high voltage scene, which is difficult to meet the efficient and stable charging needs of existing users. UTILITY MODEL CONTENTS

[0004] The utility model aims at the defects and deficiencies of prior art, provides a bidirectional charging detection wire rod, including charging loop, the charging loop includes first interface, second interface, power line and reference line, the charging loop can realize the reverse charging of first interface to second interface, and the forward charging of second interface to first interface, the power line is connected between the power terminal of first interface and the power terminal of second interface, the reference line is connected between the ground terminal of first interface and the ground terminal of second interface, still include:

[0005] Detection resistance R1 is arranged on the reference line, and the first end of the detection resistance R1 is connected to the ground terminal;

[0006] Master control circuit is used for detecting first voltage, and judging the direction of charging current according to first voltage;

[0007] The first output end of the voltage dividing circuit is connected to the second end of the detection resistance R1, the second output end of the voltage dividing circuit is connected to the voltage detection port of the master control circuit, the input end of the voltage dividing circuit is connected to the reference voltage, and the voltage dividing circuit is used for converting first voltage into second voltage.

[0008] Further, the ground terminal is the ground port MCU_GND of the master control circuit.

[0009] Further, the power supply circuit is further connected with the power supply end of the master control circuit and the power supply end of the voltage dividing circuit, and is configured to process the voltage input from the first interface or the second interface and output the processed voltage to the master control circuit and the voltage dividing circuit.

[0010] Further, the voltage dividing circuit comprises a first voltage dividing resistor R2 and a second voltage dividing resistor R7, one end of the first voltage dividing resistor R2 is connected with the output end of the power supply circuit, the other end of the first voltage dividing resistor R2 is connected with one end of the second voltage dividing resistor R7 and the voltage detection port of the master control circuit, and the other end of the second voltage dividing resistor R7 is connected with the second end of the detection resistor R1 and the ground terminal of the second interface.

[0011] Further, the display circuit is further connected with the master control circuit and is configured to display the charging current direction and the charging state.

[0012] Optionally, the first interface and the second interface are further provided with a connecting cable, the power line and the reference line are arranged in the connecting cable, the display circuit is arranged on the first interface, the second interface or the connecting cable, and the master control circuit is arranged on the first interface, the second interface or the connecting cable.

[0013] Further, the first interface and the second interface are USB connectors.

[0014] Optionally, the first interface and the second interface are USB connectors of the same structure and Type-C specification.

[0015] Optionally, the first interface and the second interface are magnetic interfaces, plug-in interfaces or wireless charging interfaces.

[0016] The utility model discloses an embodiment of the utility model through setting up detection resistor R1 in reference line, and utilizing master control circuit to carry out voltage detection to the non-ground end of detection resistor R1, realizes positive and negative current detection function, compared with prior art, the utility model discloses an embodiment adopts single detection resistor design, effectively avoids the problem of internal resistance increase caused by the existing multiple detection resistors, and improves charging efficiency.

[0017] Secondly, the complex operational amplifier detection circuit is omitted, the circuit design is significantly simplified, the production cost is reduced, the power consumption increase caused by the complexity of the circuit is reduced, in the fast charging high voltage scene, the risk of heat accumulation is reduced, and the safety and stability of the charging process are improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings described in the following description are only some embodiments of the present application, and not all embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0019] Figure 1 is a structural block diagram of the first embodiment of the present application;

[0020] Figure 2 is a structural block diagram of the second embodiment of the present application;

[0021] Figure 3 is a circuit diagram of the main control circuit of the present application;

[0022] Figure 4 is a circuit diagram of the voltage dividing circuit of the present application;

[0023] Figure 5 is a circuit diagram of the power supply circuit of the present application;

[0024] Figure 6 is a circuit diagram of the first display unit of the present application;

[0025] Figure 7 is a circuit diagram of the second display unit of the present application. DETAILED DESCRIPTION

[0026] The present application will be further described in detail below with reference to the accompanying drawings.

[0027] The present embodiment is only an explanation of the present application, and is not a limitation of the present application. Those skilled in the art can make modifications to the present embodiment without creative contribution after reading the present specification, but as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law.

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0030] First embodiment:

[0031] With reference to Figure 1 The embodiment of the present application provides a bidirectional charging detection wire, which comprises a charging circuit, the charging circuit comprises a first interface 10, a second interface 20, a power line and a reference line, the charging circuit can realize reverse charging of the first interface 10 to the second interface 20 and forward charging of the second interface 20 to the first interface 10, the power line is connected between a power terminal of the first interface 10 and a power terminal of the second interface 20, and the reference line is connected between a grounding terminal of the first interface 10 and a grounding terminal of the second interface 20, wherein the bidirectional charging detection wire further comprises:

[0032] A detection resistor R1 is arranged on the reference line, and a first end of the detection resistor R1 is connected to the ground;

[0033] The detection resistor R1 arranged on the reference line includes being connected in series at the middle of the reference line, the end of the reference line or other equivalent mode of being connected to the charging circuit together with the reference line.

[0034] Further, the bidirectional charging detection wire further comprises a main control circuit 100, a voltage detection port of the main control circuit 100 is connected to a second end of the detection resistor R1, and the main control circuit 100 is used for detecting a first voltage of the second end of the detection resistor R1.

[0035] Further, the bidirectional charging detection wire further comprises a voltage dividing circuit 200, a first output end of the voltage dividing circuit 200 is connected to the second end of the detection resistor R1, a second output end of the voltage dividing circuit 200 is connected to the voltage detection port of the main control circuit 100, an input end of the voltage dividing circuit 200 is connected to a reference voltage, and the voltage dividing circuit 200 is used for converting the first voltage into a second voltage.

[0036] The bidirectional charging detection wire in the embodiment can be used as an extension line of a charging wire, can be matched with a special adapter to provide a charging function for related equipment, and can be directly used as a charging medium for connecting two electronic devices. The charged device can be an electronic device such as a handheld terminal, or can be an energy storage device such as a power bank.

[0037] When there is a current flow between the first interface 10 and the second interface 20, the current passes through the detection resistor R1 and generates a voltage difference across the detection resistor R1, and when the charging is reverse charging, that is, the first interface 10 charges the second interface 20, the voltage at the second end of the detection resistor R1 is positive; when it is forward charging, that is, the second interface 20 charges the first interface 10, the voltage at the second end of the detection resistor R1 is negative.

[0038] The resistance value of the detection resistor R1 is designed to be a small value to reduce the loop resistance and power consumption, but due to the small resistance value, the first voltage generated across the detection resistor R1 is low, close to the lower limit of the resolution of the existing main control circuit 100, and direct detection of the polarity is easily affected by noise interference or insufficient accuracy, thereby affecting the reliability of the detection. Therefore, the embodiment converts the first voltage into a second voltage that is suitable for the input range of the main control circuit 100 through the voltage dividing circuit 200, effectively improves the signal quality and anti-interference ability, and ensures that the main control circuit 100 can accurately detect and process the charging current signal.

[0039] Further, the design of the ground end as the ground port MCU GND of the main control circuit 100 can eliminate the influence of the reference line potential difference, ensure the stability and consistency of the detection voltage signal, thereby simplifying the subsequent calculation process of the charging current and the discharging current, and improving the accuracy and efficiency of the calculation. For specific charging current and discharging current calculation process, please refer to the third embodiment, which will not be described here.

[0040] At the same time, the ground end is set as the ground port MCU GND of the main control circuit 100, which avoids additional ground connection or independent signal loop, reduces the complexity of the wire structure, reduces the material and manufacturing cost, and improves the reliability and integration of the overall system.

[0041] The first interface 10 and the second interface 20 are USB connectors.

[0042] Specifically, the first interface 10 and the second interface 20 are of the same structure and are both Type-C specification USB connectors, and the two ends realize charging and discharging and data interaction through the Type-C specification USB connectors, which has wide applicability and conforms to the future standardization development direction.

[0043] Further, the first interface 10 and the second interface 20 can also be magnetic interfaces, plug-in interfaces or wireless charging interfaces to adapt to different scene use requirements and improve the compatibility and multifunctionality of the product.

[0044] Second embodiment:

[0045] Reference Figure 1The utility model provides a kind of two-way charging detection wire, wherein, two-way charging detection wire further includes power supply circuit 300, the output of power supply circuit 300 is connected respectively the power supply end of main control circuit 100 and the power supply end of voltage division circuit 200, power supply circuit 300 is used to process the voltage inputted by the first interface 10 or the second interface 20, and the voltage after processing is output to main control circuit 100 and voltage division circuit 200.

[0046] Wherein, to ensure the normal operation of main control circuit 100, it needs to provide stable working voltage for it, when the voltage is inputted by the first interface 10 or the second interface 20, power supply circuit 300 receives input voltage and carries out voltage reduction, filter voltage stabilization and other processing through internal voltage regulation module, to eliminate the fluctuation or interference of input voltage, the stable voltage after processing is output to main control circuit 100 through power supply end on the one hand, to ensure that it can work continuously;On the other hand, another power supply end provides necessary reference voltage to voltage division circuit 200, to ensure the normal operation of voltage division circuit 200, voltage division circuit 200 needs to convert the first voltage generated at both ends of detection resistor R1 into second voltage, to adapt the best input range of main control circuit 100 voltage detection port.

[0047] Reference Figure 5 Specifically, power supply circuit 300 includes resistance R9, capacitor C3, capacitor C4, capacitor C5 and voltage reduction unit U2, one end of resistance R9 is connected with power line, the other end of resistance R9 is connected with one end of capacitor C3 and the first port and third port of voltage reduction unit U2, the fifth port of voltage reduction unit U2 is connected with one end of capacitor C4, one end of capacitor C5 and the output of power supply circuit 300, the second port of voltage reduction unit U2, the other end of capacitor C3, the other end of capacitor C4, the other end of capacitor C5 are grounded;The input voltage of power line is limited by resistance R9, then enters the first port of voltage reduction unit U2, at the same time, the high-frequency noise of input voltage is inhibited by capacitor C3 for filtering, voltage reduction unit U2 starts voltage stabilization function according to the control signal of third port, to reduce input voltage to required stable output voltage, to output to fifth port, and the output voltage is further filtered by capacitor C4 and capacitor C5 to improve the stability and anti-interference ability of output voltage.

[0048] Wherein, the first port of voltage reduction unit U2 is power input pin, for accessing input voltage to be stabilized;The second port is ground pin, as reference point of circuit;The third port is enable pin, for controlling the enable or close of voltage reduction unit U2;The fifth port is voltage stabilization output pin, for providing stable output voltage.

[0049] It should be noted that the voltage reduction unit U2 in the embodiment is an LDO chip, and can also be other chips with the same or similar functions. The power supply circuit 300 in the embodiment is a conventional setting in the prior art, which can be easily determined by those skilled in the art according to the description, drawings and the above content, and thus will not be described here.

[0050] Referring to Figure 4 , specifically, the voltage dividing circuit 200 includes a first voltage dividing resistor R2 and a second voltage dividing resistor R7. One end of the first voltage dividing resistor R2 is connected to the output end of the power supply circuit 300, the other end of the first voltage dividing resistor R2 is connected to one end of the second voltage dividing resistor R7 and the voltage detection port of the main control circuit 100, and the other end of the second voltage dividing resistor R7 is connected to the second end of the detection resistor R1 and the ground terminal of the second interface 20.

[0051] Referring to Figure 3 , specifically, the main control circuit 100 includes a main control unit U1 and a capacitor C1. The second end of the main control unit U1 is a ground terminal, the third and fourth ends of the main control unit U1 are signal control ends of the display circuit 400, the fifth end VDD of the main control unit U1 is a power supply end, the sixth end AD1 of the main control unit U1 is a voltage detection port, the output end of the power supply circuit 300 is connected to one end of the capacitor C1 and the fifth end of the main control unit U1, the other end of the capacitor C1 is grounded, and the sixth end of the main control unit U1 is connected between the first voltage dividing resistor R2 and the second voltage dividing resistor R7, for collecting the second voltage output by the voltage dividing circuit 200.

[0052] The second voltage is the first voltage generated across the detection resistor R1, which is output to the main control circuit 100 after being divided by the first voltage dividing resistor R2 and the second voltage dividing resistor R7. Since the voltage dividing principle is linear distribution, as long as the first voltage increases or decreases with the charging current, the second voltage will correspondingly increase or decrease by the same proportion, so that the main control circuit 100 can stably and accurately collect current information and further determine the direction and size of the current. Specifically, when the charging current is 0, the second voltage outputs a reference voltage value determined by the resistance ratio of the voltage dividing resistors R2 and R7, representing the reference voltage in the static state. When there is a forward charging current, the first voltage is negative, and the second voltage decreases relative to the reference value due to the voltage dividing effect of the first voltage, and gradually decreases as the current increases. Conversely, when there is a reverse charging current, the first voltage is positive, and the second voltage increases relative to the reference value due to the voltage dividing effect of the first voltage, and gradually increases as the current increases. Through this linear mapping relationship of voltage division, the main control circuit 100 can stably obtain the change information of the second voltage, thereby accurately determining the direction and size of the current, and realizing accurate current detection and control function.

[0053] Third embodiment:

[0054] With reference to Figure 2 The utility model provides a two -way charging detection wire still, further include display circuit 400, display circuit 400 connects main control circuit 100 for display charging current direction and charging state.

[0055] Further, the first interface 10 and the second interface 20 are further provided with a connection cable, the power line and the reference line are arranged in the connection cable, the display circuit 400 is arranged on the first interface 10, the second interface 20 or the connection cable, and the main control circuit is arranged on the first interface 10, the second interface 20 or the connection cable.

[0056] Specifically, the connection cable can further be provided with a wire for connecting the signal end of the first interface 10 and the second interface 20, so that the two-way charging wire structure in the embodiment has a signal transmission function.

[0057] In the embodiment, the display circuit 400 further includes a first display unit 410 and a second display unit 420, and the first display unit 410 and the second display unit 420 are respectively arranged on the first interface 10 and the second interface 20. The first display unit 410 and the second display unit 420 can be a display screen, a digital display, an LED lamp, an LED lamp group, an LED panel, etc.

[0058] With reference to Figure 6 The first display unit 410 includes a resistor R21, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a switching tube Q1, a first LED lamp group LED1 and a second LED lamp group LED2. The power line is connected to the collector of the switching tube Q1. The base of the switching tube Q1 is connected to the fourth terminal of the main control unit U1 through the resistor R21. The emitter of the switching tube Q1 is grounded through the resistor R4 and the white LED in the first LED lamp group LED1, and is grounded through the resistor R6 and the white LED in the second LED lamp group LED2. The third terminal of the main control unit U1 is grounded through the resistor R3 and the red LED in the first LED lamp group LED1, and is grounded through the resistor R5 and the red LED in the second LED lamp group LED2.

[0059] With reference to Figure 7The second display unit 420 includes a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a switch tube Q2, a switch tube Q3, a third LED lamp group LED3, and a fourth LED lamp group LED4. A power supply line is connected to the collector of the switch tube Q2, the base of the switch tube Q2 is connected to the third end of the main control unit U1 through the resistor R10, the emitter of the switch tube Q2 is grounded through the resistor R12 and a red LED in the third LED lamp group LED3, and is grounded through the resistor R14 and a red LED in the fourth LED lamp group LED4. A power supply line is connected to the collector of the switch tube Q3, the base of the switch tube Q3 is connected to the fourth end of the main control unit U1 through the resistor R11, and the emitter of the switch tube Q3 is grounded through the resistor R13 and a white LED in the third LED lamp group LED3, and is grounded through the resistor R15 and a white LED in the fourth LED lamp group LED4.

[0060] The switch tube Q1, the switch tube Q2, and the switch tube Q3 are triodes.

[0061] When forward charging, the second display unit 420 arranged at the second interface 20 starts to work, and when reverse charging, the first display unit 410 arranged at the first interface 10 starts to work.

[0062] Specifically, in the initial stage after the device is powered on, the first display unit 410 or the second display unit 420 displays red for 3 seconds, indicating that the current charging operation is being performed. The main control circuit 100 judges the charging state by detecting the charging current. When the charging current is greater than 400 mA, the indicator light remains red, indicating that it is charging. When the charging current decreases to below 300 mA, it is switched to white, indicating that it is fully charged. In the case of white display of the indicator light, if the device is not disconnected, even if the current increases due to device operation, it will not be switched back to the red light to meet the user's usage habits.

[0063] Specifically, during the process of the charging indicator light being red, if the detected charging current is greater than 1A, it indicates that the device supports fast charging function, the main control circuit 100 sets the fast charging flag to 1 and starts timing. If the charging current does not decrease to below 300 mA within two hours, the indicator light is forcibly switched to white, prompting the user that the charging is completed. This mechanism takes into account the case of using the device while charging. Although the battery is fully charged, the current may not decrease to 300 mA due to the running demand of the device, thereby avoiding the delay of prompt caused by the high value of the current.

[0064] Specifically, the main control circuit 100 records the maximum charging current value during the charging process, and detects the current trend, when the fast charging flag is triggered, if the charging current decreases from the maximum value by more than 500mA, it is determined that the fast charging full state, the fast charging full flag is triggered and the timing starts; within the next 30 minutes, if the charging current remains stable and does not rebound, the indicator light is switched to white, prompting the charging completion.

[0065] Specifically, during the process of the charging indicator light being red, if the fast charging flag is triggered and the charging current decreases and stabilizes in the range of 300~700mA, and lasts for more than 10 minutes, the indicator light is switched to white, prompting that the device is fully charged; this mechanism can quickly and accurately indicate the charging completion state for the scene of connecting the charger when the device is close to full power and using it while charging.

[0066] Further, when the current flows from the first interface 10 to the second interface 20, it is assumed that the energy-consuming devices inside the bidirectional charging detection wire are connected to the first interface 10 side, since the detection resistor R1 is arranged on the reference line, and the ground of these devices is also on the first interface 10 side, so the current consumption of the wire itself will not pass through the detection resistor R1, at this time the current detected by the detection resistor can be basically regarded as the actual current for charging or discharging external devices, without needing to deduct the current consumption of the wire itself, by directly reading the voltage difference between the two ends of the detection resistor R1, and combining the known resistance value, the corresponding current value can be obtained, which can be directly regarded as the output or input current.

[0067] When the current flows from the second interface 20 to the first interface 10, the detection resistor R1 will detect the current flowing back from the external load and the current consumed by the internal components of the bidirectional charging detection wire, because the working current of the energy-consuming devices inside the bidirectional charging detection wire in this direction will also flow through the detection resistor R1, so the detection resistor obtains the superimposed total current, if the real charging or discharging current to the external device is needed, the current consumption of the wire itself must be deducted from the detected total current, the current consumption of the wire itself can be measured and recorded in advance through no-load or other ways, and compared with the "total current", so that a more accurate external charging or discharging current can be obtained.

[0068] The above is only used to illustrate the technical scheme of the utility model, not to limit, other modifications or equivalent replacements of the technical scheme of the utility model made by the ordinary skilled in the art should be covered in the claim range of the utility model.

Claims

1. A bidirectional charging detection wire, comprising a charging loop, the charging loop comprising a first interface, a second interface, a power line, and a reference line, the charging loop enabling reverse charging from the first interface to the second interface, and forward charging from the second interface to the first interface, the power line being connected between a power terminal of the first interface and a power terminal of the second interface, the reference line being connected between a ground terminal of the first interface and a ground terminal of the second interface, characterized in that, Also include: A detection resistor R1 is arranged on the reference line, and a first end of the detection resistor R1 is connected to the ground end; A main control circuit is used for detecting the first voltage and judging the direction of the charging current according to the first voltage; A voltage dividing circuit, a second end of the detection resistor R1 is connected to a first output end of the voltage dividing circuit, a voltage detection port of the main control circuit is connected to a second output end of the voltage dividing circuit, and a reference voltage is connected to an input end of the voltage dividing circuit, and the voltage dividing circuit is used for converting the first voltage into a second voltage.

2. The bidirectional charge detection wire of claim 1, wherein The ground end is a ground port MCU_GND of the main control circuit.

3. The bidirectional charging detection wire according to claim 1 or 2, characterized in that, Further include a power supply circuit, and output ends of the power supply circuit are respectively connected to a power supply end of the main control circuit and a power supply end of the voltage dividing circuit, the power supply circuit is used for processing the voltage input by the first interface or the second interface, and outputting the processed voltage to the main control circuit and the voltage dividing circuit.

4. The bidirectional charge detection wire of claim 3, wherein, The voltage dividing circuit includes a first voltage dividing resistor R2 and a second voltage dividing resistor R7, one end of the first voltage dividing resistor R2 is connected to the output end of the power supply circuit, the other end of the first voltage dividing resistor R2 is connected to one end of the second voltage dividing resistor R7 and the voltage detection port of the main control circuit, and the other end of the second voltage dividing resistor R7 is connected to the second end of the detection resistor R1 and the ground terminal of the second interface.

5. The bidirectional charge detection wire of claim 1, wherein, Further include a display circuit, the display circuit is connected to the main control circuit, and is used for displaying the direction of the charging current and the charging state.

6. The bidirectional charge detection wire of claim 5, wherein, The first interface and the second interface are further provided with a connection cable, the power line and the reference line are arranged in the connection cable, the display circuit is arranged on the first interface, the second interface or the connection cable, and the main control circuit is arranged on the first interface, the second interface or the connection cable.

7. The bidirectional charge detection wire of claim 1, wherein The first interface and the second interface are USB connectors.

8. The bidirectional charge detection wire of claim 7, wherein, The first interface and the second interface are USB connectors of the same structure and Type-C specification.

9. The bidirectional charge detection wire of claim 1, wherein, The first interface and the second interface are magnetic attraction interfaces, plug-in interfaces or wireless charging interfaces.

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