Standard interface communication circuit capable of bidirectional power supply

Abstract

The utility model discloses a standard interface communication circuit capable of bidirectional power supply. The standard interface communication circuit comprises a Type-C female interface module. According to the utility model, through the cooperation of the main and auxiliary power supply intelligent switching design and the rapid switch element, the pi-type filter network and the low-dropout voltage stabilizing circuit are combined, so that the voltage fluctuation in the power supply switching process is thoroughly eliminated, and the system power supply is ensured to be uninterrupted; the Type-C standard interface is adopted to integrate bidirectional power supply, data communication and peripheral control functions, the cost and the structural complexity are remarkably reduced through hardware multiplexing, and the fool-proof design and the positive and negative plugging compatibility improve the user operation convenience; meanwhile, a built-in electrostatic protection module and an intelligent communication mechanism can automatically trigger peripheral interaction when the auxiliary power supply supplies power, effectively suppress electrostatic impact and electromagnetic interference, and further enhance the reliability of the system; in addition, the main power supply preferential power supply strategy and the modular expansion capability consider energy conservation, consumption reduction and function flexible deployment, and meet the requirements of green, efficient and integrated design.

Description

Technical Field

[0001] This utility model relates to the field of interface circuit technology, specifically to a standard interface communication circuit that can be powered bidirectionally. Background Technology

[0002] In recent years, with the rapid development of electronic technology and the increasing diversification of social needs, the operational stability and functional expandability of electronic products have become core competitive indicators in the industry. Especially in application scenarios such as mobile terminals and IoT devices, the continuous reliability of system power supply is crucial. Traditional electronic devices typically rely on a single power source, posing a risk of power outages. While existing main / secondary power switching technologies can achieve basic power supply switching, they still have significant shortcomings in terms of switching speed, power supply stability, and functional integration.

[0003] Current mainstream main / slave power switching circuits mostly use relays or ordinary diodes to achieve power path switching. These solutions suffer from high response delays and are prone to voltage drops during switching, potentially leading to brief system power outages or restarts. Furthermore, existing technologies generally lack intelligent power identification capabilities, failing to dynamically adjust power supply strategies based on power status. For example, when the main power supply is connected, the slave power supply cannot be quickly disconnected to reduce energy consumption; after the main power supply is removed, the slave power supply switching delay may cause power interruptions, making it difficult to meet the requirements of high-reliability scenarios.

[0004] On the other hand, with the accelerating trend of modular design in electronic products, users' demand for flexible expansion of hardware functions is becoming increasingly urgent. However, existing power interface circuits typically only support unidirectional power supply switching, unable to provide reverse power to external devices through the interface, nor possessing data communication capabilities with functional peripherals. To achieve multi-scenario applications, manufacturers often need to add dedicated communication interfaces and power supply modules, leading to increased hardware complexity and costs, and contradicting the design philosophy of green, low-carbon, and highly efficient integration.

[0005] More importantly, traditional solutions lack effective protection against electrostatic discharge (ESD) and voltage fluctuations. When frequently plugging and unplugging the main power supply or peripherals, transient voltage spikes may damage internal circuits. Existing filtering and protection designs often use discrete component stacking, making it difficult to achieve both high-efficiency filtering and anti-interference performance within a limited space, further limiting the reliability and lifespan of the equipment.

[0006] Based on the aforementioned technical bottlenecks, there is an urgent need for an interface circuit design scheme that integrates bidirectional power supply, intelligent power management, data communication, and high reliability protection, in order to overcome the shortcomings of existing technologies such as functional singleness, high cost, and low energy efficiency, and meet the comprehensive needs of modern electronic products for power supply stability, functional expandability, and hardware integration. Utility Model Content

[0007] Therefore, the main objective of this utility model is to provide a standard interface communication circuit that can be powered bidirectionally.

[0008] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0009] This utility model embodiment provides a standard interface communication circuit that can be powered bidirectionally, including:

[0010] Type-C female connector module, used to connect main power supply or external functional peripherals, supports bidirectional power supply and data communication, and has a foolproof design;

[0011] The auxiliary power battery compartment module is used to stop supplying power when the main power is connected and automatically switch to power supply mode when the main power is disconnected.

[0012] A quick-switching module is used to maintain system power continuity when switching between the Type-C female connector module and the auxiliary power battery compartment module;

[0013] The voltage stabilization module is used to suppress voltage fluctuations during power switching and adjust the voltage to a safe range;

[0014] The power identification module determines the status of the main and auxiliary power supplies by detecting the input voltage range and controls data communication.

[0015] The electrostatic discharge (ESD) protection module is used to eliminate electrostatic shocks during plugging and unplugging.

[0016] Preferably, the Type-C female connector module includes a Type-C female connector, a first resistor, and a third resistor. The B7 terminal of the Type-C female connector is connected to the A7 terminal of the Type-C female connector and the first terminal of the first resistor, respectively. The second terminal of the first resistor is connected to the voltage stabilization module. The B6 and A6 terminals of the Type-C female connector are both connected to the first terminal of the third resistor, and the second terminal of the third resistor is connected to the voltage stabilization module.

[0017] Preferably, the electrostatic discharge protection module includes a first diode, a third diode, and a fourth diode. The negative terminal of the first diode is connected to the B9 and A9 terminals of the Type-C female connector, respectively. The positive terminal of the first diode is connected to the positive terminals of the fourth and third diodes, respectively. The negative terminal of the fourth diode is connected to the first terminal of the third resistor, the A6 terminal of the Type-C female connector, and the B6 terminal of the Type-C female connector, respectively. The negative terminal of the third diode is connected to the first terminal of the first resistor, the B7 terminal of the Type-C female connector, and the A7 terminal of the Type-C female connector, respectively.

[0018] Preferably, the power identification module includes a microcontroller, a second resistor, a fourth resistor, and a first capacitor. The IO1 terminal of the microcontroller is connected to the B7 terminal and the A7 terminal of the Type-C female connector, respectively. The IO2 terminal of the microcontroller is connected to the B6 terminal and the A6 terminal of the Type-C female connector, respectively. The first terminal of the second resistor is connected to the negative terminal of the first diode, the B9 terminal of the Type-C female connector, and the A9 terminal of the Type-C female connector, respectively. The second terminal of the second resistor is connected to the first terminal of the fourth resistor, the first terminal of the first capacitor, and the ADC1 terminal of the microcontroller, respectively. The second terminal of the fourth resistor and the second terminal of the first capacitor are both grounded.

[0019] Preferably, the auxiliary power battery compartment module includes an auxiliary power battery compartment interface and a storage battery, with the first end of the auxiliary power battery compartment interface connected to the storage battery.

[0020] Preferably, the fast switching module includes a second capacitor and a second diode. The positive terminal of the second diode is connected to the first end of the auxiliary power battery compartment interface, the negative terminal of the second diode is connected to the first end of the second capacitor, and the second end of the second capacitor is grounded.

[0021] Preferably, the voltage stabilization module includes a π-type filter network circuit and a low-dropout linear regulator circuit. The input terminal of the π-type filter network circuit is connected to the fast switching module, and the output terminal of the π-type filter network circuit is connected to the electrostatic protection module after being connected in series with the low-dropout linear regulator circuit.

[0022] Preferably, the π-type filter network circuit includes a second capacitor, a third capacitor, and a first inductor. The first end of the second capacitor is connected to the first end of the first inductor and the negative terminal of the second diode, respectively. The second end of the first inductor is connected to the first end of the third capacitor, the negative terminal of the first diode, the B9 terminal of the Type-C female connector, and the A9 terminal of the Type-C female connector, respectively. The second ends of the second capacitor and the second ends of the third capacitor are both grounded.

[0023] Preferably, the low dropout linear regulator circuit includes a low dropout linear regulator, a fourth capacitor, and a fifth capacitor. The VIN terminal of the low dropout linear regulator is connected to the second terminal of the first inductor. The VOUT terminal of the low dropout linear regulator is connected to the first terminal of the fourth capacitor, the first terminal of the fifth capacitor, and the VCC terminal of the microcontroller, respectively. The second terminals of the fourth capacitor and the second terminals of the fifth capacitor are both grounded.

[0024] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0025] This invention utilizes a smart main / secondary power supply switching design in conjunction with fast-switching elements (such as Schottky diode D2), a π-type filter network, and a low-dropout voltage regulator circuit to completely eliminate voltage fluctuations during power switching, ensuring uninterrupted system power supply. It integrates bidirectional power supply, data communication, and peripheral control functions via a Type-C standard interface, significantly reducing cost and structural complexity through hardware reuse. Its foolproof design and reversible plug-in compatibility enhance user ease of operation. Furthermore, a built-in electrostatic discharge (ESD) protection module and intelligent communication mechanism automatically trigger peripheral interaction when powered by the secondary power supply, effectively suppressing ESD and electromagnetic interference, further enhancing system reliability. In addition, the main power supply priority strategy and modular expansion capabilities balance energy saving and flexible functional deployment, meeting the requirements of green, efficient, and integrated design. Attached Figure Description

[0026] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this invention, illustrate exemplary embodiments of the present invention and, together with their description, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0027] Figure 1 This is a schematic diagram of the Type-C female connector module in a bidirectional power supply standard interface communication circuit according to an embodiment of the present invention.

[0028] Figure 2 This is a schematic diagram of the voltage stabilization module in a bidirectional power supply standard interface communication circuit according to an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the power identification module in a bidirectional power supply standard interface communication circuit according to an embodiment of the present invention. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0031] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0032] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, article, or apparatus that includes that element.

[0033] This utility model embodiment provides a standard interface communication circuit that can be powered bidirectionally, such as Figure 1-3 As shown, it includes:

[0034] Type-C female connector module, used to connect main power supply or external functional peripherals, supports bidirectional power supply and data communication, and has a foolproof design;

[0035] The auxiliary power battery compartment module is used to stop supplying power when the main power is connected and automatically switch to power supply mode when the main power is disconnected.

[0036] A quick-switching module is used to maintain system power continuity when switching between the Type-C female connector module and the auxiliary power battery compartment module;

[0037] The voltage stabilization module is used to suppress voltage fluctuations during power switching and adjust the voltage to a safe range;

[0038] The power identification module determines the status of the main and auxiliary power supplies by detecting the input voltage range (2500±200mV) and controls data communication.

[0039] The electrostatic discharge (ESD) protection module is used to eliminate electrostatic shocks during plugging and unplugging.

[0040] like Figure 1As shown, the Type-C female connector module includes a Type-C female connector J1, a first resistor R1, and a third resistor R3. The B7 terminal of the Type-C female connector J1 is connected to the A7 terminal of the Type-C female connector J1 and the first terminal of the first resistor R1, respectively. The second terminal of the first resistor R1 is connected to the voltage stabilization module. The B6 and A6 terminals of the Type-C female connector J1 are both connected to the first terminal of the third resistor R3, and the second terminal of the third resistor R3 is connected to the voltage stabilization module.

[0041] like Figure 1 As shown, the electrostatic discharge protection module includes a first diode D1, a third diode D3, and a fourth diode D4. The cathode of the first diode D1 is connected to the B9 and A9 terminals of the Type-C female connector J1, respectively. The anode of the first diode D1 is connected to the anodes of the fourth diode D4 and the third diode D3, respectively. The cathode of the fourth diode D4 is connected to the first terminal of the third resistor R3, the A6 terminal of the Type-C female connector J1, and the B6 terminal of the Type-C female connector J1, respectively. The cathode of the third diode D3 is connected to the first terminal of the first resistor R1, the B7 terminal of the Type-C female connector J1, and the A7 terminal of the Type-C female connector J1, respectively.

[0042] like Figure 3 As shown, the power identification module includes a microcontroller U2, a second resistor R2, a fourth resistor R4, and a first capacitor C1. The IO1 terminal of the microcontroller U2 is connected to the B7 terminal and the A7 terminal of the Type-C female connector J1, respectively. The IO2 terminal of the microcontroller U2 is connected to the B6 terminal and the A6 terminal of the Type-C female connector J1, respectively. The first terminal of the second resistor R2 is connected to the negative terminal of the first diode D1, the B9 terminal and the A9 terminal of the Type-C female connector J1, respectively. The second terminal of the second resistor R2 is connected to the first terminal of the fourth resistor R4, the first terminal of the first capacitor C1 and the ADC1 terminal of the microcontroller U2, respectively. The second terminals of the fourth resistor R4 and the first capacitor C1 are both grounded.

[0043] like Figure 2 As shown, the auxiliary power battery compartment module includes an auxiliary power battery compartment interface J2 and a storage battery VBAT. The first end of the auxiliary power battery compartment interface J2 is connected to the storage battery VBAT.

[0044] like Figure 2As shown, the fast switching module includes a second capacitor C2 and a second diode D2. The positive terminal of the second diode D2 is connected to the first end of the auxiliary power battery compartment interface J2, the negative terminal of the second diode D2 is connected to the first end of the second capacitor C2, and the second end of the second capacitor C2 is grounded.

[0045] like Figure 2 As shown, the voltage stabilization module includes a π-type filter network circuit and a low-dropout linear regulator circuit. The input terminal of the π-type filter network circuit is connected to the fast switching module, and the output terminal of the π-type filter network circuit is connected to the electrostatic protection module after being connected in series with the low-dropout linear regulator circuit.

[0046] like Figure 2 As shown, the π-type filter network circuit includes a second capacitor C2, a third capacitor C3, and a first inductor FB1. The first end of the second capacitor C2 is connected to the first end of the first inductor FB1 and the negative terminal of the second diode D2. The second end of the first inductor FB1 is connected to the first end of the third capacitor C3, the negative terminal of the first diode D1, the B9 terminal of the Type-C female connector J1, and the A9 terminal of the Type-C female connector J1. The second ends of the second capacitor C2 and the second ends of the third capacitor C3 are both grounded.

[0047] like Figure 2 As shown, the low dropout linear regulator circuit includes a low dropout linear regulator U1, a fourth capacitor C4, and a fifth capacitor C5. The VIN terminal of the low dropout linear regulator U1 is connected to the second terminal of the first inductor FB1. The VOUT terminal of the low dropout linear regulator U1 is connected to the first terminal of the fourth capacitor C4, the first terminal of the fifth capacitor C5, and the VCC terminal of the microcontroller U2, respectively. The second terminals of the fourth capacitor C4 and the fifth capacitor C5 are both grounded.

[0048] The working principle of this utility model is as follows:

[0049] like Figure 1-3As shown, when the main power supply is connected through the Type-C female connector J1, its B7 / A7 and B6 / A6 terminals are connected to the voltage stabilization module via the first resistor R1 and the third resistor R3, respectively. The power identification module detects the input voltage (range of 2500±200mV) through the ADC1 terminal of the microcontroller U2 and determines that it is in the main power supply mode. At this time, the auxiliary power battery compartment interface J2 is reverse cut off through the second diode D2 in the fast switching module, and the power supply is stopped. After the main power supply voltage is filtered by the π-type filter network (C2, FB1, C3) to remove high-frequency noise, it is stepped down to the system operating voltage by the low dropout linear regulator U1. At the same time, the B9 / A9 terminal of the Type-C female connector J1 eliminates the transient impact of plugging and unplugging through the electrostatic protection network composed of the first diode D1 and the third and fourth diodes D3 / D4. The microcontroller U2 establishes data communication with external devices through the IO1 / IO2 terminals.

[0050] When the main power supply is disconnected, the power identification module detects that the voltage is below the threshold, and the microcontroller U2 switches to the auxiliary power supply mode. The battery VBAT of the auxiliary power supply battery compartment interface J2 is forward-biased through the second diode D2. The system is powered by the π-type filter network and the low dropout regulator U1. At the same time, the microcontroller U2 sends commands periodically through the IO1 / IO2 terminals. If the peripheral device responds, bidirectional communication is activated. If the Type-C female connector J1 is connected to an external device, the auxiliary power supply can be reverse-biased through the Type-C female connector J1. The path is isolated by the second diode D2 to isolate the reverse interference between the main and auxiliary power supplies. The electrostatic protection module continuously suppresses the voltage spikes generated by the interface plugging and unplugging, ultimately achieving a highly integrated operation of seamless switching between the main and auxiliary power supplies, bidirectional power supply and communication functions.

[0051] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model.

Claims

1. A standard interface communication circuit capable of bidirectional power supply, characterized by, include: Type-C female connector module, used to connect main power supply or external functional peripherals, supports bidirectional power supply and data communication, and has a foolproof design; The auxiliary power battery compartment module is used to stop supplying power when the main power is connected and automatically switch to power supply mode when the main power is disconnected. A quick-switching module is used to maintain system power continuity when switching between the Type-C female connector module and the auxiliary power battery compartment module; The voltage stabilization module is used to suppress voltage fluctuations during power switching and adjust the voltage to a safe range; The power identification module determines the status of the main and auxiliary power supplies by detecting the input voltage range and controls data communication. The electrostatic discharge (ESD) protection module is used to eliminate electrostatic shocks during plugging and unplugging.

2. A standard interface communication circuit according to claim 1, wherein, The Type-C female connector module includes a Type-C female connector, a first resistor, and a third resistor. The B7 terminal of the Type-C female connector is connected to the A7 terminal of the Type-C female connector and the first terminal of the first resistor. The second terminal of the first resistor is connected to the voltage stabilization module. The B6 and A6 terminals of the Type-C female connector are both connected to the first terminal of the third resistor. The second terminal of the third resistor is connected to the voltage stabilization module.

3. A standard interface communication circuit according to claim 2, wherein, The electrostatic discharge protection module includes a first diode, a third diode, and a fourth diode. The cathode of the first diode is connected to the B9 and A9 terminals of the Type-C female connector, respectively. The anode of the first diode is connected to the anodes of the fourth and third diodes, respectively. The cathode of the fourth diode is connected to the first terminal of the third resistor, the A6 terminal of the Type-C female connector, and the B6 terminal of the Type-C female connector, respectively. The cathode of the third diode is connected to the first terminal of the first resistor, the B7 terminal of the Type-C female connector, and the A7 terminal of the Type-C female connector, respectively.

4. A standard interface communication circuit according to claim 3, wherein, The power identification module includes a microcontroller, a second resistor, a fourth resistor, and a first capacitor. The IO1 terminal of the microcontroller is connected to the B7 terminal and the A7 terminal of the Type-C female connector, respectively. The IO2 terminal of the microcontroller is connected to the B6 terminal and the A6 terminal of the Type-C female connector, respectively. The first terminal of the second resistor is connected to the negative terminal of the first diode, the B9 terminal of the Type-C female connector, and the A9 terminal of the Type-C female connector, respectively. The second terminal of the second resistor is connected to the first terminal of the fourth resistor, the first terminal of the first capacitor, and the ADC1 terminal of the microcontroller, respectively. The second terminal of the fourth resistor and the second terminal of the first capacitor are both grounded.

5. A standard interface communication circuit according to claim 4, wherein, The auxiliary power battery compartment module includes an auxiliary power battery compartment interface and a storage battery, with the first end of the auxiliary power battery compartment interface connected to the storage battery.

6. A standard interface communication circuit according to claim 5, wherein, The fast switching module includes a second capacitor and a second diode. The positive terminal of the second diode is connected to the first end of the auxiliary power battery compartment interface, the negative terminal of the second diode is connected to the first end of the second capacitor, and the second end of the second capacitor is grounded.

7. A standard interface communication circuit according to claim 6, wherein, The voltage stabilization module includes a π-type filter network circuit and a low-dropout linear regulator circuit. The input terminal of the π-type filter network circuit is connected to the fast switching module, and the output terminal of the π-type filter network circuit is connected to the electrostatic protection module after being connected in series with the low-dropout linear regulator circuit.

8. A standard interface communication circuit according to claim 7, wherein, The π-type filter network circuit includes a second capacitor, a third capacitor, and a first inductor. The first end of the second capacitor is connected to the first end of the first inductor and the negative terminal of the second diode, respectively. The second end of the first inductor is connected to the first end of the third capacitor, the negative terminal of the first diode, the B9 terminal of the Type-C female connector, and the A9 terminal of the Type-C female connector, respectively. The second ends of the second capacitor and the second ends of the third capacitor are both grounded.

9. A standard interface communication circuit according to claim 8, wherein, The low-dropout linear regulator circuit includes a low-dropout linear regulator, a fourth capacitor, and a fifth capacitor. The VIN terminal of the low-dropout linear regulator is connected to the second terminal of the first inductor. The VOUT terminal of the low-dropout linear regulator is connected to the first terminal of the fourth capacitor, the first terminal of the fifth capacitor, and the VCC terminal of the microcontroller, respectively. The second terminals of the fourth capacitor and the second terminals of the fifth capacitor are both grounded.

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