Interface conversion circuit and interface converter for USB-C to Lightning

Abstract

The utility model discloses an interface conversion circuit and method, comprising a first switch unit used for realizing signal transmission between a CC1 pin of a USB-C interface and a CC pin of a Lightning interface, and a second switch unit used for realizing signal transmission between a CC2 pin of the USB-C interface and the CC pin of the Lightning interface. The first switch unit is used for controlling signals to be transmitted between the first switch unit and the Lightning interface, the second switch unit is used for controlling signals to be transmitted between the second switch unit and the Lightning interface, and the cc switching circuit is used for controlling signals to be transmitted between the first switch unit and the Lightning interface or controlling signals to be transmitted between the second switch unit and the Lightning interface. Only by using the cc conversion circuit formed by simple discrete electronic devices, quiescent current can be greatly reduced on the premise that the requirement of MFi authentication is met, and the purposes of miniaturization and low power consumption are achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to interface switching technical field, concretely relates to an interface conversion circuit. BACKGROUND

[0002] With the diversified development of electronic equipment interfaces, users usually need to charge and data transmission operations between different devices, for example, Apple's old devices (such as iPhone, iPad) use Lightning interface, while new devices (such as iPhone 15, some iPads and MacBooks) gradually adopt USB-C interface, for Apple device users, due to its huge user group and high market share, there is a great demand for USB-C to Lightning adapters.

[0003] However, most of the USB-C to Lightning converters on the market currently adopt an integrated chip scheme to realize the CC signal switching of the interface, the complex internal structure and packaging size of which lead to a relatively high overall product price, and due to the high power consumption characteristics of the integrated chip, its actual static current has approached the upper limit of MFi certification requirements (MFi certification requires static current ≤1.25mA), not only increasing the complexity of circuit design, but also limiting the space for further optimizing product performance, therefore, how to reduce production cost, reduce power consumption and realize smaller and more portable products by optimizing the CC switching circuit design under the premise of meeting the MFi certification requirements is a problem to be solved in the prior art. SUMMARY

[0004] To solve the problems existing in the prior art, the utility model provides an interface conversion circuit, which adopts a cc switching circuit composed of discrete electronic devices, realizes control of data signal transmission and support for PD, DCP and other fast charging protocols.

[0005] In a first aspect, the utility model provides an interface conversion circuit, comprising:

[0006] A first switch unit, a first end of which is connected to the CC1 pin of the USB-C interface, and a second end of which is connected to the CC pin of the Lightning interface, for realizing signal transmission between the CC1 pin of the USB-C interface and the CC pin of the Lightning interface;

[0007] A second switch unit, a first end of which is connected to the CC2 pin of the USB-C interface, and a second end of which is connected to the CC pin of the Lightning interface, for realizing signal transmission between the CC2 pin of the USB-C interface and the CC pin of the Lightning interface;

[0008] a cc switching circuit, a first control end of the cc switching circuit is connected to the controlled end of the first switch unit, a second control end of the cc switching circuit is connected to the controlled end of the second switch unit, and an input end of the cc switching circuit is connected to the CC1 pin and the CC2 pin of the USB-C interface, and the cc switching circuit is configured to control the transmission of a signal between the first switch unit and the Lightning interface.

[0009] Alternatively, the cc switching circuit is configured to control the transmission of a signal between the second switch unit and the Lightning interface.

[0010] Further, the cc switching circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first switch tube, and a second switch tube, the CC1 pin of the USB-C interface is connected to the base of the first switch tube through the first resistor, and is connected to the collector of the second switch tube and the controlled end of the first switch unit through the third resistor, the emitter of the first switch tube is grounded, the power supply end of the USB-C interface is connected to the collector of the first switch tube and the sixth resistor through the second resistor, the CC2 pin of the USB-C interface is connected to the base of the second switch tube through the fourth resistor, and is connected to the collector of the first switch tube and the controlled end of the second switch unit through the sixth resistor, the emitter of the second switch tube is grounded, and the power supply end of the USB-C interface is connected to the collector of the second switch tube and the third resistor through the fifth resistor.

[0011] Further, the first switch unit comprises a third switch tube, and the second switch unit comprises a fourth switch tube, the gate of the third switch tube is connected to the controlled end of the first switch unit, the source of the third switch tube is connected to the CC1 pin of the USB-C interface, and the drain of the third switch tube is connected to the CC pin of the Lightning interface, the gate of the fourth switch tube is connected to the controlled end of the second switch unit, the source of the fourth switch tube is connected to the CC2 pin of the USB-C interface, and the drain of the fourth switch tube is connected to the CC pin of the Lightning interface.

[0012] Further, the first switch unit further comprises a first diode, and the second switch unit further comprises a second diode, the anode of the first diode is connected to the source of the third switch tube, the cathode of the first diode is connected to the drain of the third switch tube, the anode of the second diode is connected to the source of the fourth switch tube, and the cathode of the second diode is connected to the drain of the fourth switch tube.

[0013] Further, the first switch tube and the second switch tube are both NPN transistors, the third switch tube and the fourth switch tube are both NMOS tubes, and the first diode and the second diode are both diodes.

[0014] Further, the first resistance and the second resistance have equal resistance values, and the third resistance and the fourth resistance have equal resistance values.

[0015] Further, the first switch tube and the second switch tube are integrated MOS tubes in a two-in-one package form, and the third switch tube and the fourth switch tube are integrated triodes in a two-in-one package form.

[0016] Further, the first diode and the second diode are integrated diodes in a two-in-one package form.

[0017] In a second aspect, the utility model also provides an interface converter, at least including USB-C interface, interface conversion circuit and Lighning interface, USB-C interface respectively with interface conversion circuit and Lighning interface electricity is connected, interface conversion circuit with Lighning interface electricity is connected, interface conversion circuit is above-mentioned interface conversion circuit.

[0018] The A6 pin and the B6 pin of the USB-C interface are connected to the DP pin of the Lighning interface, and the A7 pin and the B7 pin of the USB-C interface are connected to the DM pin of the Lighning interface.

[0019] The power supply end of the USB-C interface is connected to the A4 pin, the B4 pin, the A9 pin and the B9 pin of the USB-C interface, and the A1 pin, the A12 pin, the B1 pin, the B12 pin, the G1 pin, the G2 pin, the G3 pin and the G4 pin of the USB-C interface are connected to the ground end.

[0020] Compared with the prior art, the utility model has the following advantages:

[0021] Compared with the existing integrated chip scheme, the utility model embodiment does not need additional integrated chips or specific MFI chips, and only needs to use the cc conversion circuit composed of simple discrete electronic devices to greatly reduce the static current under the premise of meeting the requirements of MFi authentication, so that the miniaturization and low power consumption are realized.

[0022] In addition, through the control design of the CC switching circuit to the first switch unit and the second switch unit, the precise control of the two switch units is realized, so that the CC1 or CC2 pin of the USB-C interface and the CC pin of the Lightning interface enter the continuous and stable connection state, and the utility model embodiment discards the high-cost and high-power integrated chip scheme in the prior art, and uses simple and efficient discrete devices to realize the CC signal transmission function, so that the production cost and the circuit complexity are greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1is a female pin schematic diagram of a USB-C interface;

[0024] Figure 2 is a male pin schematic diagram of a Lightnint interface;

[0025] Figure 3 is a principle block diagram of an interface switching circuit embodiment of the utility model;

[0026] Figure 4 is a circuit principle diagram of another interface switching circuit embodiment of the utility model;

[0027] Figure 5 is a circuit principle diagram of still another interface switching circuit embodiment of the utility model;

[0028] Figure 6 is a principle block diagram of an interface converter of the utility model.

[0029] Reference signs:

[0030] DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0032] The terms "first", "second", "third" in the present application are only for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number or order of the indicated technical features. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship or movement condition between components in a certain posture (as shown in the drawings); it should be noted that when a component is referred to as "fixed to", "arranged to", "connected to" another component, it can be directly on another component or there can be a middle component. When a component is considered as "connected" to another component, it can be directly connected to another component, or there can be one or more middle components. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for illustrative purposes, and do not represent the only implementation.

[0033] Reference Figure 1The pin distribution of the female head of the USB-C interface comprises two rows of symmetrical pins, which are marked as group A (A1-A12) and group B (B1-B12), wherein, the pins and function explanations related to the utility model are as follows:

[0034] CC1 (A5 pin) and CC2 (B5 pin) are important pins in the USB-C interface for power supply negotiation (USB Power Delivery, PD) and fast charging protocol identification, the cc switching circuit of the utility model is connected with the two pins respectively, for realizing the switching and transmission of CC signal.

[0035] VBUS (A4, A9, B4, B9 pin) is a power supply pin, which provides a voltage output of 5V to 20V, for supplying power to the connected device, in the utility model, the VBUS pin is connected to the control circuit through discrete components, for providing working voltage for the switching tube.

[0036] D+ (A6 pin, B6 pin) and D- (A7 pin, B7 pin) are connected with the DP and DM pins of the Lightning interface through the interface conversion circuit, supporting data transmission function.

[0037] GND (A1, A12, B1, B12 pin) is a ground pin, for providing reference voltage for the circuit.

[0038] It should be noted that although only the pin distribution of the female head of the USB-C interface is mentioned in the above description, in fact, the design of the utility model is also applicable to the male head of the USB-C interface, the male head and the female head of the USB-C interface have the same pin function and arrangement mode, only the connection mode is different, therefore, the cc switching circuit of the utility model can be adapted and signal transmission between the female head and the male head.

[0039] With reference to Figure 2 In the utility model, pin 1 (VBUS) is used for supplying power to the device, pin 1 (VBUS) is connected with the power pin of the Lightning interface through the VBUS pin of the USB-C interface, ensuring the normal power supply of the device, pin 2 (DP) is responsible for the positive data transmission in the USB 2.0 protocol, pin 3 (DM) is responsible for the negative data transmission in the USB 2.0 protocol, pin 4 (ID) is used for accessory authentication and protocol identification, pins 5-8 (GND) provide ground connection, ensuring the stable operation of the circuit.

[0040] With reference to Figure 3 The utility model discloses an interface conversion circuit, comprising:

[0041] The first switch unit 200 has a first end connected with the CC1 pin of the USB-C interface and a second end connected with the CC pin of the Lightning interface, and is used for realizing signal transmission between the CC1 pin of the USB-C interface and the CC pin of the Lightning interface.

[0042] The second switch unit 300 has a first end connected with the CC2 pin of the USB-C interface and a second end connected with the CC pin of the Lightning interface, and is used for realizing signal transmission between the CC2 pin of the USB-C interface and the CC pin of the Lightning interface.

[0043] The cc switching circuit 100 has a first control end connected with the controlled end of the first switch unit 200, a second control end connected with the controlled end of the second switch unit 300, and an input end connected with the CC1 pin and the CC2 pin of the USB-C interface, and is used for controlling signal transmission between the first switch unit 200 and the Lightning interface.

[0044] Or, the cc switching circuit 100 is used for controlling signal transmission between the second switch unit 300 and the Lightning interface.

[0045] Compared with the existing integrated chip scheme, the embodiment of the utility model does not need additional integrated chip or specific MFI chip, only needs to use the cc conversion circuit composed of simple discrete electronic devices, can greatly reduce the static current under the premise of meeting the requirement of MFi authentication, realizes the miniaturization and low power consumption target.

[0046] In addition, through the control design of the cc switching circuit to the first switch unit and the second switch unit respectively, the precise control of the two switch units is realized, the CC1 or CC2 pin of the USB-C interface and the CC pin of the Lightning interface enter the continuous and stable connection state, the design discards the high-cost and high-power integrated chip scheme in the prior art, and the simple and efficient discrete device is used to realize the CC signal transmission function, so that the production cost and the circuit complexity are greatly reduced.

[0047] It should be noted that the first end of the first switch unit 200 is a signal input end, used for receiving the CC1 signal from the USB-C interface, the second end of the first switch unit 200 is a signal output end, the signal of the CC1 pin is transmitted to the CC pin of the Lightning interface, the first end of the second switch unit 300 is a signal input end, used for receiving the CC2 signal from the USB-C interface, and the second end of the second switch unit 300 is a signal output end, used for transmitting the signal of the CC2 pin to the CC pin of the Lightning interface.

[0048] It also needs to be explained that the first control end of the CC switching circuit 100 is a signal output end for controlling the working of the first switch unit 200, which makes the controlled end of the first switch unit 200 conduct or cut off through a control signal, so as to realize the CC signal transmission between the CC1 pin of the USB-C interface and the Lightning interface, and the controlled end of the first switch unit 200 is an input end for receiving the control signal, when the controlled end receives the signal from the first control end of the CC switching circuit 100, the first switch unit 200 is turned on, and the CC1 pin of the USB-C interface and the Lightning interface establish a signal path.

[0049] Similarly, the second control end of the CC switching circuit 100 is a signal output end for controlling the working of the second switch unit 300, which makes the controlled end of the second switch unit 300 conduct or cut off through a control signal, so as to realize the CC signal transmission between the CC2 pin of the USB-C interface and the Lightning interface, and the controlled end of the second switch unit 300 is an input end for receiving the control signal, when the controlled end receives the signal from the second control end of the CC switching circuit 100, the second switch unit 300 is turned on, and the CC2 pin of the USB-C interface and the Lightning interface establish a signal path.

[0050] Referring to Figure 4 The utility model discloses another interface conversion circuit, specifically, CC switching circuit 100 includes first resistance R7, second resistance R8, third resistance R9, fourth resistance R10, fifth resistance R11, sixth resistance R12, first switch tube Q2 and second switch tube Q4, the CC1 pin of USB-C interface is connected to the first switch tube Q2 base through first resistance R7, and is connected to the controlled end of the first switch unit 200 through the third resistance R9 respectively with the second switch tube Q4 collector, the first switch tube Q2 emitter is grounded, and the power supply end of USB-C interface is connected to the first switch tube Q2 collector and the sixth resistance R12 through the second resistance R8 respectively, the CC2 pin of USB-C interface is connected to the second switch tube Q4 base through the fourth resistance R10, and is connected to the controlled end of the second switch unit 300 through the sixth resistance R12 respectively with the first switch tube Q2 collector, the second switch tube Q4 emitter is grounded, and the power supply end of the USB-C interface is connected to the second switch tube Q4 collector and the third resistance R9 through the fifth resistance R11.

[0051] Further, the first switch unit 200 includes a third switch tube Q1, and the second switch unit 300 includes a fourth switch tube Q3, the gate of the third switch tube Q1 is connected to the controlled end of the first switch unit 200, the source is connected to the CC1 pin of the USB-C interface, and the drain is connected to the CC pin of the Lightning interface, the gate of the fourth switch tube Q3 is connected to the controlled end of the second switch unit 300, the source is connected to the CC2 pin of the USB-C interface, and the drain is connected to the CC pin of the Lightning interface.

[0052] Specifically, when the CC1 pin of the USB-C accesses the CC channel, the Rp resistor on the CC channel cooperates with the voltage division formed by the diode D4 and the Rd resistor inside the Lightning C94, so that the host end can recognize that a device is accessed, and the VBUS output voltage is normal, at this time, the VBUS end provides a bias current for the first switch tube Q2 through the R11 and R9 resistors, so that the first switch tube Q2 is saturated and turned on, after the first switch tube Q2 is turned on, the collector voltage is pulled low, and the base voltage of the second switch tube Q4 of the second control unit is pulled to a very low value through the R12, so that the second switch tube Q4 remains in the cut-off state, thereby avoiding the competitive relationship with the second switch tube Q2, in this state, the third switch tube Q1 is activated, allowing the signal of the CC1 pin to be transmitted to the CC pin of the Lightning interface through the third switch tube Q1, completing the stable connection of the CC1 of the USB-C and the CC of the Lightning, and realizing the normal negotiation and data communication of the PD protocol.

[0053] Similarly, if the CC2 pin of the USB-C accesses the CC channel, the CC2 pin forms a voltage division through the diode D5 and the Rd resistor of the Lightning C94, so that the host end recognizes that a device is accessed, and the VBUS provides a bias current for the second switch tube Q4 of the second control unit through the R10 and R12, so that the second switch tube Q4 is saturated and turned on, and the first switch tube Q2 is cut off due to the low base voltage, at this time, the fourth switch tube Q3 of the second communication unit is activated, allowing the signal of the CC2 pin to be transmitted to the CC pin of the Lightning interface through Q3, realizing the stable connection of the CC2 of the USB-C and the CC of the Lightning.

[0054] By controlling the conduction and cut-off of Q2 and Q4, the mutual exclusive switching between CC1 and CC2 is realized, the voltage is limited by using the voltage division resistor, the MOS tube is prevented from being damaged, the system static current is controlled in the MFi certification requirement range by selecting appropriate resistance values, and the low power consumption and high efficiency operation of the system are ensured

[0055] In some embodiments, the first switch unit 200 further comprises a first diode D4, the second switch unit 300 further comprises a second diode D5, the anode of the first diode D4 is connected to the source of the third switch Q1, and the cathode is connected to the drain of the third switch Q1, the anode of the second diode D5 is connected to the source of the fourth switch Q3, and the cathode is connected to the drain of the fourth switch Q3.

[0056] The utility model discloses an embodiment through the setting of the first diode D4 and the second diode D5, realize the one -way conduction control of signal path between the source drain of third switch Q1 and fourth switch Q3, further promote the stability and reliability of CC signal transmission.

[0057] In some embodiments, the first switch Q2 and the second switch Q4 adopt NPN transistors, and the signal transmission of the USB-C interface CC1 and CC2 pins is controlled respectively; the third switch Q1 and the fourth switch Q3 adopt NMOS tubes, and the switching control of the Lightning interface is realized; the first diode D4 and the second diode D5 are connected between the source drain of the third switch Q1 and the fourth switch Q3 respectively, for providing a one-way conduction path, preventing signal reverse flow, and ensuring the stable transmission and switching control of the CC signal.

[0058] In some embodiments, the resistance values of the first resistor R7 and the second resistor R8 are equal, ensuring that the current distribution of the base of the first switch Q2 and the second switch Q4 is balanced by the USB-C interface power supply end, and the resistance values of the third resistor R9 and the fourth resistor R10 are equal, ensuring the signal transmission consistency of the control circuit by the USB-C interface CC1 and CC2 pins.

[0059] Referring Figure 5 , the utility model discloses still another interface conversion circuit, specifically, the first switch Q2 and the second switch Q4 adopt integrated MOS tube of two-in-one package form, and the third switch Q1 and the fourth switch Q3 adopt integrated triode of two-in-one package form.

[0060] Further, the first switch Q2 and the second switch Q4 adopt integrated diode of two-in-one package form, wherein the CC1 pin is connected to the first end of the integrated diode, the CC2 pin is connected to the second end of the integrated diode, and the third end of the integrated diode is connected to the CC pin of the Lightning interface.

[0061] It should be noted that the first end of the integrated diode corresponds to the anode of the first diode in the integrated diode, the second end of the integrated diode corresponds to the anode of the second diode in the integrated diode, and the third end of the seventh switch is the common cathode of the two diodes, that is, the cathodes of the two diodes are connected to form a common end.

[0062] It should be further noted that the first end of the integrated MOS tube and the integrated triode is Q2_E, the second end is Q2_B, the third end is Q1_C, the fourth end is Q1_E, the fifth end is Q1_B, and the sixth end is Q2_C, wherein the first end Q2_E corresponds to the emitter (source) of the second switch tube inside the package, the second end Q2_B corresponds to the base (gate) of the second switch tube inside the package, the third end Q1_C corresponds to the collector (drain) of the first switch tube inside the package, the fourth end Q1_E corresponds to the emitter (source) of the first switch tube inside the package, the fifth end Q1_B corresponds to the base (gate) of the first switch tube inside the package, and the sixth end Q2_C corresponds to the collector (drain) of the second switch tube inside the package.

[0063] Referring to Figures 4-6 , the utility model embodiment provides an interface converter, at least including USB-C interface, interface conversion circuit and Lighning interface, USB-C interface is connected with interface conversion circuit and Lighning interface electricity respectively, interface conversion circuit is connected with Lighning interface electricity.

[0064] Specifically, the VBUS, DP and DM and GND network of the USB-C interface are all directly connected to the corresponding pin of the Lightning interface by the mode of electrical connection, and this part does not need any electronic components to participate in conversion.

[0065] Further, the A6 pin and B6 pin of the USB-C interface are connected with the DP pin of the Lightning interface, which ensures the data compatibility between the two interfaces, not only realizes the data path of the two interfaces, but also ensures the stability and efficiency of high-speed data transmission, and the A7 pin and B7 pin of the USB-C interface are connected with the DM pin of the Lightning interface, which can ensure the correct transmission of negative signal in the data transmission process, further optimize the bidirectionality of data communication, the A4, B4, A9, B9 pin of the USB-C interface are connected with the power supply end (VBUS), which provides 5V to 20V power output, can meet the different voltage requirements of the connected equipment, and the A1, A12, B1, B12, G1, G2, G3, G4 pin of the USB-C interface are connected with the ground end, which can provide stable reference voltage and good electrical grounding, ensure that the circuit will not produce signal interference and electrical noise problem due to poor grounding.

[0066] It should be noted that the A6 pin and B6 pin of the USB-C interface correspond to the DP pin on the Figure 6 , the A7 pin and B7 pin of the USB-C interface correspond to the DM pin on the Figure 6 .

[0067] The utility model is not limited to the above optional implementation, and anyone can draw other various forms of products under the enlightenment of the utility model, but no matter any change in shape or structure, any technical scheme falling into the scope defined by the utility model claims falls within the protection scope of the utility model.

Claims

1. An interface conversion circuit, characterized by, The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit.

2. An interface conversion circuit as claimed in claim 1, characterized in that The application relates to a USB-C interface and a Lightning interface switching circuit.

3. An interface conversion circuit as claimed in claim 2, characterized in that The application relates to a USB-C interface and a Lightning interface switching circuit.

4. An interface conversion circuit as claimed in claim 3, characterized in that The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. 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The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface and a Lightning interface switching circuit. The application relates to a USB-C interface 5. An interface conversion circuit as claimed in claim 4, characterized in that The first switch tube and the second switch tube are NPN transistors, and the third switch tube and the fourth switch tube are NMOS tubes.

6. An interface conversion circuit as claimed in claim 2, characterized in that The first resistor and the second resistor have equal resistance values, and the third resistor and the fourth resistor have equal resistance values.

7. An interface conversion circuit as claimed in claim 3, characterized in that The first switch tube and the second switch tube are integrated MOS tubes in a two-in-one package form, and the third switch tube and the fourth switch tube are integrated transistors in a two-in-one package form.

8. An interface conversion circuit as claimed in claim 4, characterized in that The first diode and the second diode are integrated diodes in a two-in-one package form.

9. An interface converter characterized by The interface conversion circuit comprises at least a USB-C interface, an interface conversion circuit and a Lighning interface, the USB-C interface is electrically connected with the interface conversion circuit and the Lighning interface respectively, and the interface conversion circuit is electrically connected with the Lighning interface.

10. An interface converter as claimed in claim 9, characterised in that, The A6 pin and the B6 pin of the USB-C interface are connected to the DP pin of the Lighning interface, and the A7 pin and the B7 pin of the USB-C interface are connected to the DM pin of the Lighning interface. The power supply end of the USB-C interface is connected with the A4 pin, the B4 pin, the A9 pin and the B9 pin of the USB-C interface respectively, and the A1 pin, the A12 pin, the B1 pin, the B12 pin, the G1 pin, the G2 pin, the G3 pin and the G4 pin of the USB-C interface are connected to the ground end.

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