Bidirectional power supply circuit and bidirectional power supply device

Abstract

This application discloses a bidirectional power supply circuit and a bidirectional power supply device. The circuit includes a voltage difference balancing module and a safety module. The voltage difference balancing module is connected between a first power supply and a second power supply. The first terminal of the safety module is connected to both the first and second power supplies, and the second terminal of the safety module is grounded. The voltage difference balancing module includes a first diode and a second diode. The cathode of the first diode is connected to the first power supply, and the anode of the first diode is connected to the second power supply via a Universal Serial Bus (USB) interface. The cathode of the second diode is also connected to the second power supply via a USB interface, and the anode of the second diode is connected to the first power supply. The voltage difference balancing module is used to balance the voltage difference between the first and second power supplies through the voltage drop of either the first or second diode. Using this circuit can reduce the complexity of the bidirectional power supply circuit, reduce the cost of the circuit, and enable the integration of the bidirectional power supply circuit into miniaturized devices.

Description

Technical Field

[0001] This application relates to the field of power supply technology, and in particular to a bidirectional power supply circuit and a bidirectional power supply device. Background Technology

[0002] With the development of power technology and the increasing demand from users for convenient charging, USB-based bidirectional power supply technology has emerged. This technology allows two power devices (such as mobile phones, computers, headphones, Bluetooth speakers, etc.) to exchange power via a USB interface. This technology is widely used in in-vehicle connectivity, outdoor applications, and other scenarios.

[0003] To achieve bidirectional power supply between different power supply devices, it is often necessary to set up circuit modules such as control circuits, synchronous buck-boost circuits, and bidirectional power supply switching circuits between the two power supply devices. Only by cooperating with each other can the two power supply devices be guaranteed to supply power safely and effectively.

[0004] However, current bidirectional power supply circuits are relatively complex, and suffer from high costs and difficulty in integration. Utility Model Content

[0005] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a bidirectional power supply circuit and a bidirectional power supply device that can reduce the complexity of the bidirectional power supply circuit, reduce the cost of the circuit, and realize the integration of the bidirectional power supply circuit in miniaturized devices.

[0006] In a first aspect, this application provides a bidirectional power supply circuit. The circuit includes a voltage difference balancing module and a safety module. The voltage difference balancing module is connected between a first power supply and a second power supply. The first terminal of the safety module is connected to both the first and second power supplies, and the second terminal of the safety module is grounded. The voltage difference balancing module includes a first diode and a second diode. The cathode of the first diode is connected to the first power supply, and the anode of the first diode is connected to the second power supply via a Universal Serial Bus (USB) interface. The cathode of the second diode is connected to the second power supply via a USB interface, and the anode of the second diode is connected to the first power supply. The voltage difference balancing module is used to balance the voltage difference between the first and second power supplies through the voltage drop of the first diode or the voltage drop of the second diode.

[0007] In conjunction with the first aspect, in one possible implementation, the safety module includes a first fuse, a second fuse, and a Zener diode. The first fuse is connected between the first power supply and the voltage difference balancing module, the second fuse is connected between the voltage difference balancing module and the second power supply, the cathode of the Zener diode is connected to the first terminal of the voltage difference balancing module, and the anode of the Zener diode is grounded.

[0008] In conjunction with the first aspect, in one possible implementation, the Zener diode is either a transient voltage suppressor diode or an electrostatic discharge protection element.

[0009] In conjunction with the first aspect, in one possible implementation, the bidirectional power supply circuit further includes a filter module, the first terminal of which is connected to the second terminal of the voltage difference balancing module, and the second terminal of the filter module is grounded.

[0010] In conjunction with the first aspect, in one possible implementation, the filtering module includes a first capacitor and a second capacitor, the first capacitor and the second capacitor are connected in parallel, the first terminal of the first capacitor is connected to the second terminal of the voltage difference balancing module, and the second terminal of the first capacitor is grounded; the first terminal of the second capacitor is connected to the second terminal of the voltage difference balancing module, and the second terminal of the second capacitor is grounded.

[0011] In conjunction with the first aspect, in one possible implementation, the capacitance value of the first capacitor is different from that of the second capacitor.

[0012] In conjunction with the first aspect, in one possible implementation, the capacitance value of the first capacitor is greater than the capacitance value of the second capacitor. The first capacitor is used for low-frequency filtering of the bidirectional power supply circuit, and the second capacitor is used for high-frequency filtering of the bidirectional power supply circuit.

[0013] In conjunction with the first aspect, in one possible implementation, the first capacitor and the second capacitor are either electrolytic capacitors or ceramic capacitors.

[0014] In conjunction with the first aspect, in one possible implementation, the voltage of the first power supply is 5V.

[0015] Secondly, this application also provides a bidirectional power supply device. The device includes the bidirectional power supply circuit of the first aspect and any one of the first aspects.

[0016] This application provides a bidirectional power supply circuit and a bidirectional power supply device. The bidirectional power supply circuit includes a voltage difference balancing module and a safety module. The voltage difference balancing module is connected between a first power supply and a second power supply. The first terminal of the safety module is connected to both the first and second power supplies, and the second terminal of the safety module is grounded. The voltage difference balancing module includes a first diode and a second diode. The cathode of the first diode is connected to the first power supply, and the anode of the first diode is connected to the second power supply via a Universal Serial Bus (USB) interface. The cathode of the second diode is also connected to the second power supply via a USB interface, and the anode of the second diode is connected to the first power supply. The voltage difference balancing module is used to balance the voltage difference between the first and second power supplies through the voltage drop of the first or second diode. This application embodiment achieves effective and stable bidirectional power supply between two power supply devices through the voltage difference balancing module and the safety module. Furthermore, the voltage difference balancing module includes two diodes connected in reverse between the first power supply and the second power supply. That is, the bidirectional power supply circuit provided in this application embodiment can achieve effective and stable bidirectional power supply between the two power supply devices with fewer components. There is no need for control circuits to perform step-up / step-down, bidirectional power supply switching, etc., which effectively reduces the complexity and cost of the bidirectional power supply circuit. At the same time, based on the small circuit size, the bidirectional power supply circuit can be integrated into miniaturized devices, which improves the integration level of the bidirectional power supply circuit. Attached Figure Description

[0017] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the structure of a bidirectional power supply circuit in the prior art; Figure 2 This is a schematic diagram of the bidirectional power supply circuit in one embodiment; Figure 3 This is another schematic diagram of the bidirectional power supply circuit in one embodiment; Figure 4 This is another schematic diagram of the bidirectional power supply circuit in one embodiment; Figure 5 This is another schematic diagram of the bidirectional power supply circuit in one embodiment; Figure 6 This is another schematic diagram of the bidirectional power supply circuit in one embodiment.

[0018] Explanation of reference numerals in the attached diagram: 10-Voltage differential balancing module, 11-First diode, 12-Second diode, 20-Safety module, 21-First fuse, 22-Second fuse, 23-Zenith diode, 30-Universal serial bus interface, 40-Filtering module, 41-First capacitor, 42-Second capacitor. Detailed Implementation

[0019] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the relevant utility model and not intended to limit the scope of the utility model. Furthermore, it should be noted that, for ease of description, only the parts relevant to the utility model are shown in the accompanying drawings.

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The application will now be described in detail with reference to the accompanying drawings and embodiments. Furthermore, the term "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone.

[0021] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0022] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0024] With the development of power technology and the increasing demand from users for convenient charging, USB-based bidirectional power supply technology has emerged. This technology allows two power devices (such as mobile phones, computers, headphones, Bluetooth speakers, etc.) to exchange power via a USB interface. This technology is widely used in in-vehicle connectivity, outdoor applications, and other scenarios.

[0025] like Figure 1 As shown, to achieve bidirectional power supply between different power supply devices, it is often necessary to set up circuit modules such as voltage conversion circuits 1 and 3, control circuit 2, synchronous buck-boost circuit 4, and bidirectional power supply switching circuit 5 between the two power supply devices. These circuit modules must cooperate to ensure safe and efficient power supply between the two power supply devices. However, current bidirectional power supply circuit structures are relatively complex, resulting in high costs and difficulties in integration.

[0026] Based on this, embodiments of this application provide a bidirectional power supply circuit and a bidirectional power supply device, which can effectively reduce circuit complexity, thereby reducing circuit cost, and at the same time realize the integration of the circuit on miniaturized devices.

[0027] In one embodiment, such as Figure 2 As shown, a bidirectional power supply circuit is provided, which includes a voltage difference balancing module 10 and a safety module 20. The voltage difference balancing module 10 is connected between a first power supply and a second power supply. The first terminal of the safety module 20 is connected to both the first and second power supplies, and the second terminal of the safety module 20 is grounded. The voltage difference balancing module 10 includes a first diode 11 and a second diode 12. The cathode of the first diode 11 is connected to the first power supply, and the anode of the first diode 11 is connected to the second power supply through a Universal Serial Bus interface 30. The cathode of the second diode 12 is connected to the second power supply through the Universal Serial Bus interface 30, and the anode of the second diode 12 is connected to the first power supply. The voltage difference balancing module 10 is used to balance the voltage difference between the first power supply and the second power supply through the voltage drop of the first diode 11 or the voltage drop of the second diode 12.

[0028] Considering that there may be errors between the power supply voltage of the first power supply VDD1 and the power supply voltage of the second power supply VDD2, a voltage difference balancing module 10 is set up to reduce the voltage difference between the power supply voltage of the first power supply and the power supply voltage of the second power supply. That is, to reduce the voltage difference between the first power supply and the second power supply in the fully charged state after the power supply is completed, so as to ensure effective and accurate power supply between the first power supply and the second power supply.

[0029] Specifically, the voltage difference balancing module 10 can eliminate power supply voltage errors through devices with voltage drop capabilities. Furthermore, to ensure voltage difference balance during bidirectional power supply from both the first and second power supplies, the voltage difference balancing module 10 includes a first diode 11 and a second diode 12, which are connected in reverse configuration between the first and second power supplies. That is, when the cathode of the first diode 11 is connected to the second power supply via a Universal Serial Bus (USB) interface 30, and its anode is connected to the first power supply, the cathode of the second diode 12 is connected to the first power supply, and its anode is connected to the second power supply via the USB interface 30.

[0030] In other words, when the cathode of the first diode 11 is connected to the first power supply and the anode is connected to the second power supply via the Universal Serial Bus (USB) interface 30, the cathode of the second diode 12 is connected to the second power supply via the USB interface 30, and the anode is connected to the first power supply. In this configuration, when the first power supply supplies power to the second power supply, the first diode 11 is turned off, and the second diode 12 is forward-biased. The voltage drop across the second power supply through the second diode 12 reduces the voltage difference between the first and second power supplies, maintaining voltage balance between them. When the second power supply supplies power to the first power supply, the first diode 11 is forward-biased, and the second diode 12 is turned off. The voltage drop across the second power supply through the first diode 11 reduces the voltage difference between the second and second power supplies, maintaining voltage balance between them.

[0031] For example, when the Universal Serial Bus (USB) interface supports a standard voltage of 5±0.25V (i.e., within the range of 4.75-5.25V), the output voltage fluctuates, causing a voltage error between the first and second power supplies during power supply, thus affecting their stability and effectiveness. Therefore, two reverse-biased diodes can be placed between them, using the 0.3V voltage drop across the diodes to balance the voltage difference between the first and second power supplies.

[0032] In one possible implementation, when the standard voltage supported by the Universal Serial Bus (USB) interface is 5 ± 0.25V, the voltage of the first power supply is 5V and / or the voltage of the second power supply is 5V. This is to maintain the voltage difference between the first and second power supplies within a small range, avoiding damage to the bidirectional power supply circuit caused by a large voltage difference between them.

[0033] In this embodiment, the voltage difference balancing module 10 can balance the small voltage difference between the first power supply and the second power supply caused by voltage fluctuations. However, when the voltage difference between the first power supply and the second power supply is large, it may damage the bidirectional power supply circuit. Therefore, a safety module 20 is needed to provide overvoltage protection, overcurrent protection, short-circuit protection, and other safety protections for the bidirectional power supply circuit. Specifically, the safety module 20 can achieve safety protection for the bidirectional power supply circuit by disconnecting the circuit, connecting the first or second power supply to ground, balancing the device voltage, etc.

[0034] The first terminal of the safety module 20 is connected to both the first and second power supplies, and the second terminal is grounded. Grounding provides circuit protection against high current conditions such as overcurrent and short circuits. In one possible implementation, since the voltage difference balancing module 10 is connected between the first and second power supplies, the first terminal of the safety module 20 is directly connected to the first power supply and connected to the second power supply via the voltage difference balancing module 10; or, as... Figure 3 As shown, the first end of the safety module 20 is directly connected to the second power supply, and is connected to the first power supply through the voltage difference balancing module 10.

[0035] The bidirectional power supply circuit provided in this application includes a voltage difference balancing module and a safety module. The voltage difference balancing module is connected between a first power supply and a second power supply. The first terminal of the safety module is connected to both the first and second power supplies, and the second terminal of the safety module is grounded. The voltage difference balancing module includes a first diode and a second diode. The cathode of the first diode is connected to the first power supply, and the anode of the first diode is connected to the second power supply via a Universal Serial Bus (USB) interface. The cathode of the second diode is also connected to the second power supply via a USB interface, and the anode of the second diode is connected to the first power supply. The voltage difference balancing module is used to balance the voltage difference between the first and second power supplies through the voltage drop of either the first or second diode. This application embodiment achieves effective and stable bidirectional power supply between two power supply devices through the voltage difference balancing module and the safety module. Furthermore, the voltage difference balancing module includes two diodes connected in reverse between the first power supply and the second power supply. That is, the bidirectional power supply circuit provided in this application embodiment can achieve effective and stable bidirectional power supply between the two power supply devices with fewer components. There is no need for control circuits to perform step-up / step-down, bidirectional power supply switching, etc., which effectively reduces the complexity and cost of the bidirectional power supply circuit. At the same time, based on the small circuit size, the bidirectional power supply circuit can be integrated into miniaturized devices, which improves the integration level of the bidirectional power supply circuit.

[0036] In one embodiment, such as Figure 4As shown, the safety module 20 includes a first fuse 21, a second fuse 22, and a Zener diode 23. The first fuse 21 is connected between the first power supply and the voltage difference balancing module 10. The second fuse 22 is connected between the voltage difference balancing module 10 and the second power supply. The cathode of the Zener diode 23 is connected to the first terminal of the voltage difference balancing module 10, and the anode of the Zener diode 23 is grounded.

[0037] In this embodiment, the safety module 20 includes a first fuse 21 and a second fuse 22. The first fuse 21 and the second fuse 22 can be fuses, respectively connected between the power supply and the voltage difference balancing module 10. Specifically, the first fuse 21 is connected between the voltage difference balancing module 10 and the second power supply, and the second fuse 22 is connected between the first power supply and the voltage difference balancing module 10. Alternatively, as shown in the diagram, the first fuse 21 is connected between the first power supply and the voltage difference balancing module 10, and the second fuse 22 is connected between the voltage difference balancing module 10 and the second power supply. In this case, when the voltage difference between the first power supply and the second power supply is large, for example, when the first power supply is 10V and the second power supply is 5V, the large voltage difference leads to a large current in the circuit. When the current reaches the fusing current of the first fuse 21, the first fuse 21 melts, breaking the path between the first power supply and the second power supply, thus preventing the large current from damaging the components in the bidirectional power supply circuit.

[0038] In this embodiment, the safety module 20 further includes a Zener diode 23. Based on the reverse breakdown characteristic of the Zener diode 23, its cathode is connected to the first terminal of the voltage difference balancing module 10, and its anode is grounded. That is, the cathode of the Zener diode 23 is directly connected to the second power supply and connected to the first power supply through the voltage difference balancing module 10; or, the cathode of the Zener diode 23 is directly connected to the first power supply and connected to the second power supply through the voltage difference balancing module 10. When the current or current change in the bidirectional power supply circuit is large, the Zener diode 23 can absorb the voltage fluctuations in the bidirectional power supply circuit, maintain its own and the circuit's voltage stability, and at the same time ground the current to avoid damage to other devices in the bidirectional power supply circuit.

[0039] Among them, the Zener diode 23 can be a transient voltage suppressor (TVS) or an electrostatic discharge protection (ESD) element.

[0040] The safety module in the circuit provided in this application embodiment includes a first fuse, a second fuse, and a Zener diode. The first fuse is connected between the first power supply and the voltage difference balancing module, the second fuse is connected between the voltage difference balancing module and the second power supply, the cathode of the Zener diode is connected to the first terminal of the voltage difference balancing module, and the anode of the Zener diode is grounded. That is, the circuit provided in this application embodiment can achieve overcurrent protection, overvoltage protection, and short-circuit protection functions for the bidirectional power supply circuit through device fusing and device voltage regulation, improving the safety and stability of the bidirectional power supply circuit and further ensuring the power supply effectiveness of the bidirectional power supply circuit. Furthermore, this application can achieve bidirectional power supply using passive devices such as diodes and fuses, without the need for control circuitry, effectively reducing circuit complexity.

[0041] In one embodiment, such as Figure 5 As shown, the bidirectional power supply circuit also includes a filter module 40. The first end of the filter module 40 is connected to the second end of the voltage difference balancing module 10, and the second end of the filter module 40 is grounded.

[0042] In this embodiment, the bidirectional power supply circuit further includes a filter module 40, which is used to reduce voltage fluctuations in the bidirectional power supply circuit and achieve voltage smoothing.

[0043] The filtering module may include capacitors, which smooth the circuit voltage through their charging and discharging characteristics. Specifically, in the event of voltage fluctuations in the bidirectional power supply circuit, when the voltage of the bidirectional power supply circuit increases, the capacitor reduces the magnitude of the voltage increase by storing energy; when the voltage of the bidirectional power supply circuit decreases, the capacitor discharges to replenish the load voltage, reducing the magnitude of the voltage decrease and mitigating circuit fluctuations.

[0044] In one embodiment, such as Figure 6 As shown, the filter module 40 may include a first capacitor 41 and a second capacitor 42. The first capacitor 41 and the second capacitor 42 are connected in parallel. The first terminal of the first capacitor 41 is connected to the second terminal of the voltage difference balancing module 10, and the second terminal of the first capacitor 41 is grounded. The first terminal of the second capacitor is connected to the second terminal of the voltage difference balancing module, and the second terminal of the second capacitor is grounded.

[0045] In this embodiment, considering that different types of signals to be filtered may appear in the bidirectional power supply circuit, such as high-frequency and low-frequency noise signals, multiple capacitors can be set to filter different noises. Specifically, the filtering module 40 may include a first capacitor 41 and a second capacitor 42, which are connected in parallel, and the two ends of the first capacitor 41 and the second capacitor 42 are respectively connected to the voltage difference balancing module 10 and ground.

[0046] Both the first capacitor 41 and the second capacitor 42 can perform filtering on the bidirectional power supply circuit. To improve the comprehensiveness of filtering, the capacitance values ​​of the first capacitor 41 and the second capacitor 42 can be set to be different.

[0047] In the first capacitor 41 and the second capacitor 42, the capacitor with the relatively larger capacitance value is used for low-frequency filtering of the bidirectional power supply circuit, and the capacitor with the relatively smaller capacitance value is used for high-frequency filtering of the bidirectional power supply circuit. In one possible implementation, the capacitance value of the first capacitor 41 is greater than the capacitance value of the second capacitor, in which case the first capacitor 41 is used for low-frequency filtering of the bidirectional power supply circuit, and the second capacitor 42 is used for high-frequency filtering of the bidirectional power supply circuit.

[0048] In this capacitor configuration, the first capacitor 41 and the second capacitor 42 are either electrolytic capacitors or ceramic capacitors. The first capacitor 41 and the second capacitor 42 can be of the same or different types. For example, both the first capacitor 41 and the second capacitor 42 can be electrolytic capacitors or both can be ceramic capacitors. Considering the larger capacitance of electrolytic capacitors and the superior high-frequency characteristics of ceramic capacitors, the first capacitor 41 can also be an electrolytic capacitor, and the second capacitor 42 can be a ceramic capacitor.

[0049] The filtering module in the circuit provided in this application embodiment includes a first capacitor and a second capacitor. The first capacitor and the second capacitor are connected in parallel. The first terminal of the first capacitor is connected to the second terminal of the voltage difference balancing module, and the second terminal of the first capacitor is grounded. The first terminal of the second capacitor is connected to the second terminal of the voltage difference balancing module, and the second terminal of the second capacitor is grounded. This application embodiment achieves filtering of multiple types of signals by using different capacitors, improving the comprehensiveness of circuit filtering and thus improving the stability of the bidirectional power supply circuit.

[0050] In one embodiment, a bidirectional power supply device is provided, which includes the bidirectional power supply circuit described in the above embodiment. The bidirectional power supply circuit includes a voltage difference balancing module 10 and a safety module 20. The voltage difference balancing module 10 is connected between a first power supply and a second power supply. The first terminal of the safety module 20 is connected to both the first power supply and the second power supply, and the second terminal of the safety module 20 is grounded. The voltage difference balancing module 10 includes a first diode 11 and a second diode 12. The cathode of the first diode 11 is connected to the first power supply, and the anode of the first diode 11 is connected to the second power supply via a Universal Serial Bus interface 30. The cathode of the second diode 12 is connected to the second power supply via the Universal Serial Bus interface 30, and the anode of the second diode 12 is connected to the first power supply. The voltage difference balancing module 10 is used to balance the voltage difference between the first power supply and the second power supply through the voltage drop of the first diode 11 or the voltage drop of the second diode 12.

[0051] In this embodiment of the application, the bidirectional power supply device may be a driving device for bidirectional power supply, etc.

[0052] The voltage difference balancing module 10 in the bidirectional power supply circuit can eliminate power supply voltage errors through devices with voltage drop. Furthermore, to ensure voltage difference balance during bidirectional power supply from both the first and second power supplies, the voltage difference balancing module 10 includes a first diode 11 and a second diode 12, which are connected in reverse configuration between the first and second power supplies. Specifically, the cathode of the first diode 11 is connected to the second power supply via a Universal Serial Bus (USB) interface 30, while its anode is connected to the first power supply. Similarly, the cathode of the second diode 12 is connected to the first power supply, and its anode is connected to the second power supply via the USB interface 30.

[0053] In other words, when the cathode of the first diode 11 is connected to the first power supply and the anode is connected to the second power supply via the Universal Serial Bus (USB) interface 30, the cathode of the second diode 12 is connected to the second power supply via the USB interface 30, and the anode is connected to the first power supply. In this configuration, when the first power supply supplies power to the second power supply, the first diode 11 is turned off, and the second diode 12 is forward-biased. The voltage drop across the second power supply through the second diode 12 reduces the voltage difference between the first and second power supplies, maintaining voltage balance between them. When the second power supply supplies power to the first power supply, the first diode 11 is forward-biased, and the second diode 12 is turned off. The voltage drop across the second power supply through the first diode 11 reduces the voltage difference between the second and second power supplies, maintaining voltage balance between them.

[0054] For example, when the Universal Serial Bus (USB) interface supports a standard voltage of 5±0.25V (i.e., within the range of 4.75-5.25V), the output voltage fluctuates, causing a voltage error between the first and second power supplies during power supply, thus affecting their stability and effectiveness. Therefore, two reverse-biased diodes can be placed between them, using the 0.3V voltage drop across the diodes to balance the voltage difference between the first and second power supplies.

[0055] In one possible implementation, when the standard voltage supported by the Universal Serial Bus (USB) interface is 5 ± 0.25V, the voltage of the first power supply is 5V and / or the voltage of the second power supply is 5V. This is to maintain the voltage difference between the first and second power supplies within a small range, avoiding damage to the bidirectional power supply circuit caused by a large voltage difference between them.

[0056] In this embodiment, the voltage difference balancing module 10 can reduce the small voltage difference between the first power supply and the second power supply caused by voltage fluctuations. However, when the voltage difference between the first power supply and the second power supply is large, it may damage the bidirectional power supply circuit. Therefore, a safety module 20 is needed to provide overvoltage protection, overcurrent protection, short-circuit protection, and other safety protections for the bidirectional power supply circuit. Specifically, the safety module 20 can achieve safety protection for the bidirectional power supply circuit by disconnecting the circuit, connecting the first or second power supply to ground, balancing the device voltage, etc.

[0057] In the bidirectional power supply circuit, the first terminal of the safety module 20 is connected to both the first and second power supplies, and the second terminal is grounded. Grounding provides circuit protection against high current conditions such as overcurrent and short circuits. In one possible implementation, since the voltage difference balancing module 10 is connected between the first and second power supplies, the first terminal of the safety module 20 is directly connected to the first power supply and then connected to the second power supply via the voltage difference balancing module 10; alternatively, the first terminal of the safety module 20 is directly connected to the second power supply and then connected to the first power supply via the voltage difference balancing module 10.

[0058] The bidirectional power supply device provided in this application includes a bidirectional power supply circuit, which comprises a voltage difference balancing module and a safety module. The voltage difference balancing module is connected between a first power supply and a second power supply. The first terminal of the safety module is connected to both the first and second power supplies, and the second terminal of the safety module is grounded. The voltage difference balancing module includes a first diode and a second diode. The cathode of the first diode is connected to the first power supply, and the anode of the first diode is connected to the second power supply via a Universal Serial Bus (USB) interface. The cathode of the second diode is also connected to the second power supply via a USB interface, and the anode of the second diode is connected to the first power supply. The voltage difference balancing module is used to balance the voltage difference between the first and second power supplies through the voltage drop of either the first or second diode. In this application embodiment, the bidirectional power supply device can achieve effective and stable bidirectional power supply between two power supply devices through the voltage difference balancing module and the safety module. Furthermore, the voltage difference balancing module includes two diodes connected in reverse between the first power supply and the second power supply. This means that the bidirectional power supply device can achieve effective and stable bidirectional power supply between the two power supply devices with fewer components. There is no need to set up control circuits for voltage boosting / bucking, bidirectional power supply switching, etc., which effectively reduces the complexity of the bidirectional power supply circuit and thus reduces the cost of the bidirectional power supply device. At the same time, the smaller circuit size enables the miniaturization of the bidirectional power supply device and improves its integration.

[0059] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments described above. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0060] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A bidirectional power supply circuit, characterized by, The circuit includes a voltage difference balancing module and a safety module. The voltage difference balancing module is connected between a first power supply and a second power supply. The first terminal of the safety module is connected to both the first power supply and the second power supply, and the second terminal of the safety module is grounded. The voltage difference balancing module includes a first diode and a second diode. The cathode of the first diode is connected to the first power supply, and the anode of the first diode is connected to the second power supply via a Universal Serial Bus (USB) interface. The cathode of the second diode is connected to the second power supply via the USB interface, and the anode of the second diode is connected to the first power supply. The voltage difference balancing module is used to balance the voltage difference between the first power supply and the second power supply by the voltage drop of the first diode or the voltage drop of the second diode.

2. The circuit of claim 1, wherein, The safety module includes a first fuse, a second fuse, and a Zener diode. The first fuse is connected between the first power supply and the voltage difference balancing module. The second fuse is connected between the voltage difference balancing module and the second power supply. The cathode of the Zener diode is connected to the first terminal of the voltage difference balancing module, and the anode of the Zener diode is grounded.

3. The circuit of claim 2, wherein, The Zener diode is either a transient voltage suppression diode or an electrostatic discharge protection element.

4. The circuit of claim 1, wherein, The bidirectional power supply circuit also includes a filter module, the first end of which is connected to the second end of the voltage difference balancing module, and the second end of the filter module is grounded.

5. The circuit of claim 4, wherein, The filtering module includes a first capacitor and a second capacitor, wherein the first capacitor and the second capacitor are connected in parallel. The first terminal of the first capacitor is connected to the second terminal of the voltage difference balancing module, and the second terminal of the first capacitor is grounded; the first terminal of the second capacitor is connected to the second terminal of the voltage difference balancing module, and the second terminal of the second capacitor is grounded.

6. The circuit according to claim 5, characterized in that, The capacitance value of the first capacitor is different from that of the second capacitor.

7. The circuit of claim 6, wherein, The capacitance of the first capacitor is greater than the capacitance of the second capacitor. The first capacitor is used for low-frequency filtering of the bidirectional power supply circuit, and the second capacitor is used for high-frequency filtering of the bidirectional power supply circuit.

8. The circuit of claim 5, wherein, The first capacitor and the second capacitor are either electrolytic capacitors or ceramic capacitors.

9. The circuit of claim 1, wherein, The voltage of the first power supply is 5V.

10. A bidirectional power supply device, characterized by comprising: The device includes a bidirectional power supply circuit as described in any one of claims 1-9.

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