OTG self-adaptive circuit and device and mobile equipment

Abstract

The utility model discloses an OTG self-adaptive circuit, device and mobile equipment, and relates to the technical field of electronics, the OTG self-adaptive circuit comprises a switch module, a common end is connected with external equipment, a first switching end is connected with a power supply signal, a second switching end is connected with a control power supply signal, and a channel selection pin is controlled by a USB identity signal; the USB identity signal is initially set to be a high level, and the common end is controlled to be connected with the second switching end; when the external interface has voltage, power is supplied to the OTG self-adaptive circuit. When the external interface has no voltage, the USB identity signal is pulled down to a low level, the common end is controlled to be connected with the first switching end, and the power supply signal supplies power to external equipment connected with the common end; the device does not need to be connected with an external USBID identity signal pin, can automatically identify whether the device is a host or a slave, can adaptively switch the power supply relation between the host and the slave without an OTG line, and can be suitable for more scenes.

Description

Technical Field

[0001] This utility model relates to the field of electronic technology, and in particular to an OTG adaptive circuit, device and mobile device. Background Technology

[0002] With the increasing frequency of interaction between mobile devices and peripheral devices, OTG (On-The-Go) technology has emerged. OTG enables mobile devices to connect directly to other USB devices, enabling data transmission, device control, and other functions, greatly improving the versatility and convenience of devices.

[0003] In conventional OTG circuits, some devices only have a 4-pin interface, omitting the USB_ID pin. The USB_ID pin plays a crucial role in OTG functionality, identifying whether the device is acting as a master or slave. When this pin is missing, the OTG circuit cannot accurately determine the device's role, thus failing to perform normal OTG functions. Furthermore, ordinary OTG circuits rely excessively on external intervention for functionality. Even if the device interface has the hardware to implement OTG, an OTG cable is still required for connection and communication between devices. This not only increases user costs but also reduces ease of use.

[0004] Therefore, improving the adaptability of OTG circuits to different scenarios has become an urgent problem to be solved in this field. Utility Model Content

[0005] The main purpose of this invention is to propose an OTG adaptive circuit and a battery interface device, aiming to solve the technical problem of how to improve the adaptability of OTG circuits to different scenarios.

[0006] To achieve the above objectives, the present invention proposes an OTG adaptive circuit, which includes a switching module.

[0007] The common terminal of the switch module is connected to an external device, the first switching terminal of the switch module is connected to a power supply signal, the second switching terminal of the switch module is connected to a control power supply signal, and the channel selection pin of the switch module is controlled by a USB identity signal. The USB identity signal is initially set to a high level to control the connection between the common terminal and the second switching terminal.

[0008] When there is voltage at the common terminal, power is supplied to the OTG adaptive circuit;

[0009] When there is no voltage at the common terminal, the USB identity signal is pulled down to a low level, controlling the common terminal to connect to the first switching terminal, and the power supply signal supplies power to the external device connected to the common terminal.

[0010] In one embodiment, the OTG adaptive circuit further includes: a control module;

[0011] One end of the control module is connected to the USB identity signal, and the other end is connected to the control power signal. The control module is used to control the level of the USB identity signal according to the level of the control power signal.

[0012] In one embodiment, when the external interface has voltage and pulls the control power signal high, the control power signal pulls the USB identity signal high.

[0013] When there is no voltage at the external interface, and the control power signal is pulled down to a low level, the control power signal pulls down the USB identity signal to a low level.

[0014] In one embodiment, the OTG adaptive circuit further includes: a power supply module;

[0015] One end of the power module is connected to the USB identity signal, and the other end is connected to the power supply signal. The power module is used to control the voltage output of the power supply signal according to the level state of the USB identity signal.

[0016] In one embodiment, when the USB identity signal is low, the power module outputs a voltage through the power supply signal to supply power to the external device connected to the power supply common terminal.

[0017] In one embodiment, the power module includes: a transistor unit and a DC-DC converter;

[0018] The enable terminal of the DC-DC converter is connected to the USB identity signal through the transistor unit, and is used to control the voltage output of the power supply signal according to the level state of the USB identity signal.

[0019] In one embodiment, when the voltage of the external interface flows into the control power signal through the switching module to maintain the USB identity signal at a high level, the DC-DC converter is turned off.

[0020] In one embodiment, when there is no input voltage at the external interface, the control power signal is at a low level, and the USB identity signal is pulled down to a low level, the DC-DC converter is turned on.

[0021] This invention also proposes an OTG adaptive device, which includes the OTG adaptive circuit described above.

[0022] This invention also proposes a mobile device, which includes the OTG adaptive device described above.

[0023] The technical solution of this utility model includes a switch module in the OTG adaptive circuit. The common terminal of the switch module is used to connect to an external USB device. When the OTG adaptive circuit acts as a device, the external device supplies power to the OTG adaptive circuit, the common terminal has a voltage input, maintaining the USB identity signal at a high level, and the common terminal is connected to the second switching terminal, allowing the external device to supply power to the OTG adaptive circuit. When the OTG adaptive circuit acts as a host, it needs to supply power to the external device. At this time, the external device connected to the common terminal has no voltage input, the USB identity signal is pulled low, the common terminal is connected to the first switching terminal, and the OTG adaptive circuit supplies power to the external device. Therefore, compared with conventional OTG circuits, this application does not require connecting an external USB_ID identity signal pin, can automatically identify whether the device is a host or a slave, and can adaptively switch the power supply relationship between the host and slave devices without an OTG cable, making it applicable to more scenarios. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, 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 the structures shown in these drawings without creative effort.

[0025] Figure 1 A schematic diagram of the structure of the OTG adaptive circuit switch module provided by this utility model;

[0026] Figure 2 A schematic diagram of the OTG adaptive circuit control module provided by this utility model;

[0027] Figure 3 A schematic diagram of the OTG adaptive circuit power module provided by this utility model;

[0028] Figure 4 A first detailed circuit structure diagram of the OTG adaptive circuit provided by this utility model;

[0029] Figure 5 A second detailed circuit structure diagram of the OTG adaptive circuit provided by this utility model;

[0030] Figure 6 A third detailed circuit structure diagram of the OTG adaptive circuit provided by this utility model;

[0031] Figure 7 The fourth detailed circuit structure diagram of the OTG adaptive circuit provided by this utility model.

[0032] Explanation of icon numbers:

[0033] 10. Switch module;

[0034] 20. Control module;

[0035] 30. Power supply module; 31. Transistor unit; 32. DC-DC converter;

[0036] First chip, U1; second chip, U2; first resistor to nineteenth resistor, R1 to R19; first capacitor to fifth capacitor, C1 to C5; first diode to th diode, D1 to D4; first transistor to third transistor, Q1 to Q3.

[0037] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0039] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0040] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0041] This invention proposes an OTG adaptive circuit.

[0042] Please see Figure 1 In one embodiment of this utility model, the OTG adaptive circuit includes: a switch module 10;

[0043] The common terminal of the switch module 10 is connected to an external device. The first switching terminal of the switch module 10 is connected to a power supply signal, and the second switching terminal of the switch module 10 is connected to a control power supply signal. The channel selection pin of the switch module 10 is controlled by a USB identity signal. The USB identity signal is initially set to a high level to control the connection between the common terminal and the second switching terminal.

[0044] When there is voltage at the common terminal, power is supplied to the OTG adaptive circuit;

[0045] When there is no voltage at the common terminal, the USB identity signal is pulled down to a low level, controlling the common terminal to connect to the first switching terminal, and the power supply signal supplies power to the external device connected to the common terminal.

[0046] It should be noted that in this embodiment, the common end can be a USB interface of various formats, and it can be compatible with irregular interfaces that only have 4 pins (VBUS, DP, DM, GND).

[0047] In this embodiment, the OTG adaptive circuit mainly consists of a switching module 10, which has multiple key connection points and control pins, specifically including:

[0048] Common terminal: The common terminal of the switch module 10 is connected to the external device. The common terminal is the main interface between the circuit and the external device and is used to transmit power or data signals.

[0049] First switching terminal: The first switching terminal of the switching module 10 is connected to the power supply signal (OTG_5V). This port is used to provide power to external devices when needed.

[0050] Second switching terminal: The second switching terminal of the switch module 10 is connected to the control power signal (USB_ID_CONTROL). This port is used to control the connection relationship of the switch module 10 according to the input of the external voltage, so as to adjust the working state of the switch module 10 and connect the external power supply to power the OTG adaptive circuit.

[0051] Channel selection pin: The channel selection pin of the switch module 10 is controlled by the USB identity signal (USB_ID). This pin is used to determine whether the common terminal is connected to the first switching terminal or the second switching terminal according to the level state of the USB identity signal. The USB identity signal is initially set to a high level, controlling the common terminal to be connected to the second switching terminal.

[0052] When there is voltage at the external interface, meaning the external device has a voltage output (the device in the OTG adaptive circuit acts as the device end), this voltage can be used to power the OTG adaptive circuit. If there is no voltage at the external interface, meaning the external device has no voltage output (the device in the OTG adaptive circuit acts as the host end), the circuit needs to rely on the internal power supply signal for power.

[0053] Furthermore, in one feasible implementation, please refer to Figure 2 The OTG adaptive circuit also includes a control module 20;

[0054] One end of the control module 20 is connected to the USB identity signal, and the other end is connected to the control power signal. The control module 20 is used to control the level of the USB identity signal according to the level of the control power signal.

[0055] In this embodiment, one end of the control module 20 is connected to the USB identity signal and is used to receive or send control signals to change the level state of the USB identity signal. The other end is connected to the control power signal and is used to detect the level state of the control power signal. The control module 20 is used to intelligently control the level state of the USB identity signal according to the level state of the control power signal, thereby realizing the control of the channel selection of the switch module 10.

[0056] Specifically, the control module 20 can be a transistor circuit that controls the conduction or cutoff state between the collector and emitter based on the level state (high level or low level) of the control power signal received at the base, thereby changing the level state of the USB identity signal.

[0057] Furthermore, in one feasible implementation, when the external interface has voltage and the control power signal is pulled up to a high level, the control power signal pulls up the USB identity signal to a high level;

[0058] When there is no voltage at the external interface, and the control power signal is pulled down to a low level, the control power signal pulls down the USB identity signal to a low level.

[0059] In this embodiment, when there is voltage at the external interface, the voltage not only provides power to the OTG adaptive circuit, but also connects to the control power signal, pulling the control power signal to a high level. In one example, the control module 20 uses a transistor circuit. When the control power signal is at a high level, the base of the transistor receives a high-level signal, causing the transistor to conduct. This conduction state creates a path between the collector and emitter, thereby pulling the USB identity signal to a high level. At this time, the channel selection pin of the switch module 10 receives a high-level USB identity signal, controlling the connection between the common terminal and the second switching terminal.

[0060] When there is no voltage at the external interface, the control power signal loses external voltage support and is pulled low. In one example, when the control power signal is low, the base of the transistor receives a low-level signal, causing the transistor to cut off. This cutoff state blocks the path between the collector and emitter, preventing the USB identity signal from being pulled high through the transistor circuit. Instead, it is pulled low through a pull-down resistor or other mechanism. At this time, the channel selection pin of the switching module 10 receives the low-level USB identity signal, controlling the common terminal to connect to the first switching terminal, thereby providing the required power to the external device.

[0061] Through this mechanism, the OTG adaptive circuit can adaptively control the level of the USB identity signal based on whether there is voltage at the external interface, thereby controlling the channel selection of the switch module 10, realizing adaptive power supply and intelligent power management. This design not only improves the flexibility and reliability of the circuit, but also reduces costs, simplifies circuit design, and enhances circuit compatibility.

[0062] Furthermore, in one feasible implementation, please refer to Figure 3 The OTG adaptive circuit further includes: a power supply module 30;

[0063] One end of the power module 30 is connected to the USB identity signal, and the other end is connected to the power supply signal. The power module 30 is used to control the voltage output of the power supply signal according to the level state of the USB identity signal.

[0064] In one feasible implementation, when the USB identity signal is low, the power module 30 outputs a voltage through the power supply signal to supply power to the external device connected to the power supply common terminal.

[0065] In this embodiment, one end of the power module 30 is connected to the USB identity signal to receive the signal's level status; the other end is connected to the power supply signal to regulate the output of the power supply signal according to the status of the USB identity signal.

[0066] The voltage output of the power supply signal is directly controlled by the level state of the USB identity signal. Specifically, the power module 30 can perform corresponding power output control operations according to different level states of the USB identity signal.

[0067] When the USB identity signal is low, the power module 30 receives a high-level signal and controls the power supply signal to output the corresponding voltage. The power supply signal is activated to provide the required power to the external device.

[0068] When the USB identity signal is high, the power module 30 immediately controls the power supply signal to stop outputting voltage to avoid unnecessary energy waste and ensure that external devices are not damaged by overvoltage.

[0069] Furthermore, in one feasible implementation, please refer to Figure 3 The power module 30 includes: a transistor unit 31 and a DC-DC converter 32;

[0070] The enable terminal of the DC-DC converter 32 is connected to the USB identity signal through the transistor unit 31, and is used to control the voltage output of the power supply signal according to the level state of the USB identity signal.

[0071] In one feasible implementation, when the voltage of the external interface flows into the control power signal through the switch module 10 to maintain the USB identity signal at a high level, the DC-DC converter 32 is turned off.

[0072] In one feasible implementation, when there is no input voltage at the external interface, the control power signal is at a low level, and the USB identity signal is pulled down to a low level, the DC-DC converter 32 is turned on.

[0073] In this embodiment, the transistor unit 31 acts as an electronic switch, controlling the enable terminal of the DC-DC converter 32 according to the level state of the USB identity signal. The DC-DC converter 32 is a high-efficiency DC-DC converter used to convert the voltage of the power supply signal into a voltage suitable for use by external devices. Its enable terminal is connected to the USB identity signal through the transistor unit 31, thereby controlling the voltage output of the power supply signal according to the level state of the USB identity signal.

[0074] When the USB identity signal is high (i.e., when there is voltage input to the external interface), the DC-DC converter 32 is turned off.

[0075] The DC-DC converter 32 is turned on when the USB identity signal is low (i.e., when there is no voltage input to the external interface).

[0076] In one example, when the device acts as the host, please refer to... Figure 4 In the power output circuit, the cathode of the first diode D1 is connected to the VCC5V0_USB30_OTG0 terminal, and the anode is connected to the first terminal of the first capacitor and the output terminal (OUT) of the first chip U1. The second terminal of the first capacitor is grounded. A first resistor is connected between the ILIM terminal of the first chip U1 and ground. The low-level active terminal (FAULT) of the first chip U1 is connected to the OTP_FAULT signal. The ground terminal (GND) of the first chip U1 is grounded. The input terminal (IN) is connected to the first terminal of the second resistor, the VCC5V0_DEVICE_30 signal, the second terminal of the third resistor, and the first terminal of the second capacitor. The second terminal of the second resistor is connected to the OTP_FAULT signal. The second terminal of the second capacitor is grounded. The first terminal of the third resistor is connected to the enable terminal (EN) of the first chip U1. The first terminals of the fourth and fifth resistors are connected. The second terminal of the fourth resistor is connected to the USB_OTG0_PWREN_H signal. The second terminal of the fifth resistor is grounded.

[0077] For the specific structure of switch module 10, please refer to Figure 5 The first end of USB port J1 is connected to the switch module. In the switch module, the NO terminal of the second chip U2 is connected to the USB_VBUS signal, the GND terminal is grounded, and the NC terminal is connected to the VCC5V0_USB30_OTG0 signal. A sixth resistor is connected between the IN terminal and the USB3_OTG_ID signal. The IN terminal is also connected to the VCC5V0_DEVICE_30 signal and the first end of the third capacitor. The V+ terminal and COM terminal of the second chip U2 are both connected to the first end of the third capacitor. The second end of the third capacitor is grounded. The first end of the third capacitor is connected to the first end of interface J1. The first ends of the fourth capacitor, the fifth capacitor, and the bidirectional trigger diode are all connected to the first end of interface J1, and the second ends are all grounded.

[0078] The circuit controls the enable of the DC-DC converter via a transistor; please refer to [reference needed]. Figure 6 The collector of the first transistor Q1 is connected to the first terminals of the seventh and eighth resistors. The second terminal of the seventh resistor is connected to the VIO_1V8 signal, and the second terminal of the eighth resistor is connected to the USB_OTG0_PWREN_H signal. The emitter of the first transistor Q1 is grounded, and the base is connected to the first terminals of the ninth and tenth resistors. The second terminal of the ninth resistor is connected to the first terminal of the eleventh resistor and the USB2_OTG0_ID signal. The second terminals of the tenth and eleventh resistors are both grounded.

[0079] Similarly, USB_ID_Control_5V controls the high and low levels of USB_ID via a transistor circuit; please refer to [reference needed]. Figure 7 The collector of the second transistor Q2 is connected to the first terminals of the twelfth and thirteenth resistors. The second terminal of the twelfth resistor is connected to the USB2_OTG0_ID signal, and the second terminal of the thirteenth resistor is connected to the VCC_1V8_50 signal. The emitter of the second transistor Q2 is grounded, and the base is connected to the first terminal of the fourteenth resistor. The collector of the third transistor Q3 is connected to the second terminal of the fourteenth resistor, the first terminal of the fifteenth resistor, and the sixteenth resistor. The second terminal of the fifteenth resistor is grounded, and the second terminal of the sixteenth resistor is connected to the VCC_1V8_50 signal. The emitter of the third transistor Q3 is grounded, and the base is connected to the first terminal of the seventeenth resistor. The second terminal of the seventeenth resistor is connected to the first terminals of the eighteenth and nineteenth resistors. The second terminal of the eighteenth resistor is connected to the USB_VBUS signal, and the second terminal of the nineteenth resistor is grounded.

[0080] This utility model also proposes an OTG adaptive device, which includes an OTG adaptive circuit. The specific structure of the OTG adaptive circuit is as described in the above embodiments. Since this battery interface device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0081] This utility model also proposes a mobile device, which includes an OTG adaptive device. The specific structure of the OTG adaptive device is as described in the above embodiments. Since this battery interface device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0082] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An OTG adaptive circuit, characterized in that, The OTG adaptive circuit includes: a switching module; The common terminal of the switch module is connected to an external device, the first switching terminal of the switch module is connected to a power supply signal, the second switching terminal of the switch module is connected to a control power supply signal, and the channel selection pin of the switch module is controlled by a USB identity signal. The USB identity signal is initially set to a high level to control the connection between the common terminal and the second switching terminal. When there is voltage at the common terminal, power is supplied to the OTG adaptive circuit; When there is no voltage at the common terminal, the USB identity signal is pulled down to a low level, controlling the common terminal to connect to the first switching terminal, and the power supply signal supplies power to the external device connected to the common terminal.

2. The OTG adaptive circuit as described in claim 1, characterized in that, The OTG adaptive circuit further includes: a control module; One end of the control module is connected to the USB identity signal, and the other end is connected to the control power signal. The control module is used to control the level of the USB identity signal according to the level of the control power signal.

3. The OTG adaptive circuit as described in claim 2, characterized in that, When there is voltage at the external interface, the control power signal is pulled up to a high level. When the control power signal pulls up the USB identity signal to a high level, the external interface is the interface on the external device that is connected to the common terminal. When there is no voltage at the external interface, and the control power signal is pulled down to a low level, the control power signal pulls down the USB identity signal to a low level.

4. The OTG adaptive circuit as described in claim 3, characterized in that, The OTG adaptive circuit also includes: a power supply module; One end of the power module is connected to the USB identity signal, and the other end is connected to the power supply signal. The power module is used to control the voltage output of the power supply signal according to the level state of the USB identity signal.

5. The OTG adaptive circuit as described in claim 4, characterized in that, When the USB identity signal is low, the power module outputs voltage through the power supply signal to supply power to the external device connected to the power supply common terminal.

6. The OTG adaptive circuit as described in claim 5, characterized in that, The power module includes: a transistor unit and a DC-DC converter; The enable terminal of the DC-DC converter is connected to the USB identity signal through the transistor unit, and is used to control the voltage output of the power supply signal according to the level state of the USB identity signal.

7. The OTG adaptive circuit as described in claim 6, characterized in that, When the voltage at the external interface flows into the control power signal through the switching module, and the USB identity signal is kept at a high level, the DC-DC converter is turned off.

8. The OTG adaptive circuit as described in claim 7, characterized in that, When there is no input voltage at the external interface, the control power signal is low, and the USB identity signal is pulled down to a low level, the DC-DC converter is turned on.

9. An OTG adaptive device, characterized in that, The OTG adaptive device includes the OTG adaptive circuit as described in any one of claims 1 to 8.

10. A mobile device, characterized in that, The mobile device includes the OTG adaptive device as described in claim 9.

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