Interface device and power supply system

Abstract

The present application relates to an interface device and a power supply system. The interface device is used in a power supply system including a DC power supply and a bus. The interface device includes an input terminal, an output terminal, and a half-bridge topology circuit. The input terminal is connected to the DC power supply, and the output terminal is connected to the bus. The half-bridge topology circuit is used to control the input and output power of the interface device. The half-bridge topology circuit includes a first switching tube and a second switching tube. The first switching tube is connected in parallel with the input terminal, and the second switching tube is connected between the input terminal and the first switching tube. The interface device is connected between the DC power supply and the bus. After receiving electrical energy from the DC power supply, the interface device outputs it to the bus after processing by the half-bridge topology circuit, thereby achieving power regulation between the DC power supply and the bus, improving the safety of the power supply system, and when multiple DC power supplies are connected to the bus, it can achieve interconnection and power sharing between the DC power supplies.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and in particular to an interface device and a power supply system. Background Art

[0002] Traditional DC power systems typically have multiple low-voltage DC power supplies connected to the DC bus. Due to the limited power of a single power supply, the total power consumption of the local load must be limited. Furthermore, multiple independent power supplies reduce power flexibility and make it impossible to adjust the power between each DC power supply and the DC bus. Directly connecting the DC power supplies in a power supply system presents certain safety risks. Summary of the Invention

[0003] Based on this, it is necessary to provide an interface device and a power supply system to address the above technical problems, which can safely and flexibly realize the interconnection of DC power supplies and regulate the power between the DC power supply and the bus.

[0004] An interface device for use in a power supply system, the power supply system including a DC power supply and a busbar, the interface device including an input terminal, an output terminal, and a half-bridge topology circuit, the input terminal being connected to the DC power supply, the output terminal being connected to the busbar, and the half-bridge topology circuit being used to control the input and output power of the interface device;

[0005] The half-bridge topology circuit includes a first switch tube and a second switch tube, the first switch tube is connected in parallel with the input end, and the second switch tube is connected between the input end and the first switch tube.

[0006] The above-mentioned interface device is connected between the DC power supply and the bus. After receiving the electric energy from the DC power supply, the interface device outputs it to the bus after processing by the half-bridge topology circuit, thereby realizing power regulation between the DC power supply and the bus, improving the safety of the power supply system, and when multiple DC power supplies are connected to the bus, mutual connection and power mutual assistance between each DC power supply can be realized.

[0007] In one embodiment, the half-bridge topology circuit further includes a first diode and a second diode; the first diode is connected in parallel with the first switch tube, and the second diode is connected in parallel with the second switch tube.

[0008] In one embodiment, the first switching tube and the second switching tube are field effect tubes, the source of the first switching tube is connected to the input end, and the drain of the first switching tube is connected to the output end; the source of the second switching tube is connected to the drain of the first switching tube, and the drain of the second switching tube is connected to the input end.

[0009] In one embodiment, the interface device includes a control unit, and the control unit includes at least one of a processor, a memory, a power management chip, a digital input and output interface, and an analog input and output interface.

[0010] In one embodiment, the interface device further includes a protection unit; when an overcurrent or short circuit occurs in the power supply system, the control unit controls the protection unit to disconnect the first switch tube and / or the second switch tube.

[0011] In one embodiment, the interface device further includes a communication unit and / or a display unit; the control unit controls the communication unit to communicate with the outside, and the control unit controls the display unit to display data information of the interface device.

[0012] A power supply system comprising a bus, a DC power supply and the above-mentioned interface device;

[0013] The DC power supply is connected to the busbar via the interface device, and the half-bridge topology circuit is used to control the input and output power of the interface device.

[0014] The above-mentioned power supply system is connected between the DC power supply and the bus through an interface device. After receiving the electrical energy from the DC power supply, the interface device is processed by the half-bridge topology circuit and output to the bus, thereby realizing power regulation between the DC power supply and the bus, improving the safety of the power supply system, and when multiple DC power supplies are connected to the bus, mutual connection and power mutual assistance between the DC power supplies can be realized.

[0015] In one embodiment, the number of the DC power supplies is multiple, and the number of the interface devices is multiple;

[0016] Wherein, each of the DC power supplies is connected in parallel to the busbar via one of the interface devices.

[0017] In one embodiment, the busbar includes a line inductor, and the interface device utilizes the line inductor for filtering.

[0018] In one embodiment, the power supply system further includes an electrical load, and the electrical load is connected to the DC power supply via a load line. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of a module of an interface device in one embodiment;

[0020] Figure 2 is a schematic diagram of a module of an interface device in another embodiment;

[0021] Figure 3is a schematic structural diagram of an interface device in one embodiment;

[0022] Figure 4 is a schematic structural diagram of a power supply system in one embodiment;

[0023] Figure 5 FIG. 1 is a structural diagram of a power supply system in another embodiment. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0025] Figure 1 FIG. 1 is a schematic diagram of a module of an interface device in an embodiment. Figure 1 As shown, in one embodiment, an interface device 100 is used in a power supply system, where the power supply system includes a DC power supply and a bus. The interface device 100 includes an input terminal 140, an output terminal 160, and a half-bridge topology circuit. The input terminal 140 is connected to the DC power supply, and the output terminal 160 is connected to the bus. The half-bridge topology circuit is used to control the input and output power of the interface device 100; wherein the half-bridge topology circuit includes a first switch tube 122 and a second switch tube 124, the first switch tube 122 is connected in parallel with the input terminal 140, and the second switch tube 124 is connected between the input terminal and the first switch tube.

[0026] Specifically, in interface device 100, input terminal 140 is used to receive power from a DC power source, and output terminal 160 is used to supply power to a bus. Input terminal 140 and output terminal 160 are connected via a half-bridge topology circuit. The half-bridge topology circuit of interface device 100 primarily comprises two power switching devices, namely, a first switching transistor 122 and a second switching transistor 124. First switching transistor 122 and second switching transistor 124 are connected in a totem pole configuration, with the midpoint connected to output terminal 160 as the output. The DC power source is connected to the bus via the half-bridge topology circuit of interface device 100, thereby enabling power input / output between the DC power source and the bus.

[0027] First switch 122 is the upper switch in a half-bridge topology circuit, and second switch 124 is the lower switch. By controlling the switching states of the upper and lower switches, the voltage flowing through interface device 100 can be adjusted based on the power flow requirements at input terminal 140 and output terminal 160, thereby actively implementing power regulation. Furthermore, when an overcurrent or short-circuit fault occurs in the circuit, the switches in the half-bridge topology circuit can be shut down, generating a protective action to improve the safety of the power supply system.

[0028] Furthermore, in the interface device 100, the types of the first switching tube 122 and the second switching tube 124 of the half-bridge topology circuit can be determined according to actual usage conditions. Specifically, devices such as switching diodes, switching transistors, and field-effect transistors with good switching performance, fast on-off state transition speed, and low loss can be selected to improve the efficiency and stability of the power supply system.

[0029] The interface device 100 is connected between a DC power supply and a bus. After receiving the electrical energy from the DC power supply, the interface device outputs the electrical energy to the bus after processing by a half-bridge topology circuit, thereby realizing power regulation between the DC power supply and the bus, improving the safety of the power supply system, and when multiple DC power supplies are connected to the bus, mutual connection and power mutual assistance between the DC power supplies can be realized.

[0030] Figure 2 FIG. 1 is a schematic diagram of a module of an interface device in another embodiment, Figure 2 As shown, in one embodiment, the input terminal 140, output terminal 160, first switch 122, and second switch 124 of the interface device 100 can have the same structures as those in the above-mentioned embodiments. The half-bridge topology circuit of the interface device 100 further includes a first diode D1 and a second diode D2; the first diode D1 is connected in parallel with the first switch 122, and the second diode D2 is connected in parallel with the second switch 144.

[0031] Specifically, the half-bridge topology circuit of the interface device 100 may further include a first diode D1 and a second diode D2. The first diode D1 and the second diode D2 are connected in parallel to the first switch 122 and the second switch 124, respectively. The interface device 100 is rectified by the first diode D1 and the second diode D2. It will be appreciated that the specific structure of the half-bridge topology circuit can be configured based on the actual situation of the interface device and is not limited to the structure of this embodiment. Other components such as inductors and capacitors may also be configured to implement functions such as filtering or voltage stabilization, thereby further improving the power supply quality of the power supply system.

[0032] Figure 3 FIG. 1 is a schematic diagram of the structure of an interface device in one embodiment. Figure 3 As shown, in one embodiment, the interface device 200 includes an input terminal 240, an output terminal 260, a first switch tube 222, and a second switch tube 224, wherein the first switch tube 222 and the second switch tube 224 are field effect tubes, the source (Source, abbreviated as S) of the first switch tube 222 is connected to the input terminal 240, and the drain (Drain, abbreviated as D) of the first switch tube 222 is connected to the output terminal 260; the source of the second switch tube 224 is connected to the drain of the first switch tube 222, and the drain of the second switch tube 224 is connected to the input terminal 240.

[0033] Specifically, in the interface device 200, the first switch 222 and the second switch 224 can both be field effect transistors (FETs). FETs are common switching devices widely used in switching circuits and have advantages such as low noise, low power consumption, a large dynamic range, ease of integration, and a wide safe operating range. Specifically, the first switch 222 and the second switch 224 can be metal oxide semiconductor (MOS) field effect transistors. The first switch 222 and the second switch 224 are connected in a totem pole arrangement, with the source of the first switch 222 and the drain of the second switch 224 connected to the two ends of the DC power supply at the input terminal 240, respectively. The drain of the first switch 222 is connected to the source of the second switch 224, with the midpoint serving as a busbar outputting to the output terminal 260. The switching states of the first switch 222 and the second switch 224 are controlled based on the input voltage of the DC power supply and the output voltage of the busbar, thereby adjusting the input and output power of the interface device. It is understandable that in the half-bridge topology circuit, other power switching devices that meet functional requirements can also be selected as the first switch tube 222 and the second switch tube 224 , and are not limited to the field effect tubes in this embodiment.

[0034] In one embodiment, the interface device includes a control unit, which includes at least one of a processor, a memory, a power management chip, a digital input and output interface, and an analog input and output interface.

[0035] Specifically, in the interface device, in addition to the half-bridge topology circuit as the main circuit connecting the DC power supply and the bus, a control unit and other functional units may also be included. The control unit is used to control and process the operation of each part of the interface device. The control unit can collect operating parameter information of the half-bridge topology circuit and other units, make calculations and judgments, and give corresponding instructions to act on the corresponding units, thereby realizing control of the interface device. The control unit may specifically include a processor, a memory, a power management chip, a digital input and output interface, and an analog input and output interface, among other devices. Among them, the processor is used to perform data calculations, the memory is used to store information data, the power management chip is used to power each unit, the digital input and output interface and the analog input and output interface are used to send and receive digital signals and analog signals respectively, thereby realizing communication connection between the control unit and other units in the interface device.

[0036] In one embodiment, the interface device further includes a protection unit; when an overcurrent or short circuit occurs in the power supply system, the control unit controls the protection unit to disconnect the first switch tube and / or the second switch tube.

[0037] Specifically, the interface device can also include an independent protection unit, which is communicatively connected to the control unit. The control unit detects parameter information on the half-bridge topology circuit in real time. When an overcurrent or short circuit is detected in the circuit, the control unit can send a control command to the protection unit to control the protection unit to disconnect the first switch tube and / or the second switch tube in the half-bridge topology circuit, thereby realizing active protection in the power supply system and improving the safety of the power supply system.

[0038] In one embodiment, the interface device further includes a communication unit and / or a display unit; the control unit controls the communication unit to communicate with the outside world, and the control unit controls the display unit to display data information of the interface device. The interface device may also be provided with a communication unit and a display unit, both of which are communicatively connected to the control unit. The communication unit can communicate with the outside world via wired or wireless means to enable information exchange between the interface device and the outside world. The display unit may specifically include a display device such as a display screen or a projector, which can display parameter information such as the operating status of the interface device to the user.

[0039] Figure 4 FIG. 1 is a schematic diagram of a power supply system in one embodiment. Figure 4 As shown, in one embodiment, a power supply system 10 includes a DC power supply 300, a bus 500 and the above-mentioned interface device 100; wherein, the DC power supply 300 is connected to the bus 500 through the interface device 100, and the half-bridge topology circuit is used to control the input and output power of the interface device 100.

[0040] Specifically, the power supply system 10 includes a DC power supply 300, a bus 500, and the interface device 100 of the above embodiment. The input terminal 140 of the interface device 100 is connected to the DC power supply 300, and the output terminal 160 of the interface device 100 is connected to the bus 500. The DC power supply 300 is connected to the bus via the interface device 100, thereby enabling power input / output between the DC power supply and the bus. The half-bridge topology circuit includes a first switching transistor 122 and a second switching transistor 124. The first switching transistor 122 and the second switching transistor 124 are connected in a totem pole manner, with the midpoint connected to the output terminal 160 as the output. Based on the power flow requirements of the input terminal 140 and the output terminal 160, the input and output power of the interface device 100 can be controlled by controlling the switching states of the first switching transistor 122 and the second switching transistor 124, thereby achieving power regulation between the DC power supply 300 and the bus 500.

[0041] Furthermore, in the power supply system 10, the first switch 122 and the second switch 124 of the half-bridge topology circuit in the interface device 100 can be power switching devices such as switching diodes, switching transistors, and field-effect transistors. The bus 500 can generally be a DC busbar, and the DC power supply 300 can be a DC power supply device such as a battery or a DC generator. Performance parameters such as the voltage and power of the DC power supply 300 can be determined based on actual needs. The power supply system can also include multiple DC power supplies 300 and interface devices 100 simultaneously. The multiple DC power supplies 300 are all connected to the bus 500 via the interface device 100 to achieve interconnection between the multiple DC power supplies 300.

[0042] Figure 5 FIG. 1 is a schematic diagram of the structure of a power supply system in another embodiment. Figure 5 As shown, in one embodiment, the power supply system 20 has multiple DC power supplies 300 and multiple interface devices 100 ; wherein each DC power supply 300 is connected in parallel to the bus 500 through one interface device 100 .

[0043] Specifically, the power supply system 20 includes multiple DC power supplies 300. The specific number of DC power supplies 300 can be determined based on the actual needs of the power supply system 20. Each DC power supply 300 is connected to an interface device 100, and the multiple DC power supplies 300 are connected in parallel to the same bus 500 through the interface devices 100. Because each DC power supply 300 has different performance parameters and operating conditions, the voltage and power of the multiple DC power supplies 300 may vary. Each interface device 100 adjusts the input and output power based on the voltage of the connected DC power supply 300 and the voltage of the bus 500, thereby ensuring voltage stability in the power supply system 20. The multiple DC power supplies 300 are also interconnected through the interface devices 100, thereby achieving power mutual assistance between the DC power supplies 300.

[0044] In one embodiment, the power supply system 20 further includes an electrical load 400, which is connected to the DC power supply 300 via a load line. In the power supply system 20, the electrical load 400 is generally a local load of each DC power supply 300, and specifically can be an electrical device such as a base station. The DC power supply 300 and the electrical load 400 are connected in series, and the DC power supply 300 supplies power to the connected electrical load 400. The electrical load 400 is also connected in series with the interface device 100, thereby regulating the voltage and power of the electrical load 400.

[0045] In one embodiment, the busbar 500 includes a line inductor, and the interface device 100 utilizes the line inductor for filtering. In the power supply system 20, the busbar 500 may specifically include two positive and negative DC busbars, and the busbars of the busbar 500 have line inductors. Since the half-bridge topology circuit in the interface device 100 operates in a high-frequency switching manner, there is no need to separately provide a filtering inductor in the power supply system 20. The interface device 100 can utilize the line inductance of the busbar 500 to achieve a filtering function, thereby reducing voltage ripple in the power supply system 20 and improving the efficiency and stability of the power supply system 20.

[0046] In one embodiment, the DC power supply 300 is a 48V DC power supply. The DC power supply 300 can be a constant current power supply device, such as a 48V low-voltage DC power supply. Specifically, it can be implemented by a DC power supply device such as a dry cell battery, a storage battery, or a DC generator. 48V low-voltage DC power supplies are currently commonly used in communication power supply systems, and the use of a 48V DC power supply can better adapt to practical applications. It is understood that the specific type and performance parameters of the DC power supply 3000 can be determined according to actual needs and are not limited to the 48V DC power supply in this embodiment.

[0047] The above-mentioned power supply system is connected between the DC power supply and the bus through an interface device. After receiving the electrical energy from the DC power supply, the interface device is processed by the half-bridge topology circuit and output to the bus, thereby realizing power regulation between the DC power supply and the bus, improving the safety of the power supply system, and when multiple DC power supplies are connected to the bus, mutual connection and power mutual assistance between the DC power supplies can be realized.

[0048] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. An interface device for use in a power supply system, wherein the power supply system includes multiple DC power supplies and busbars, characterized in that: The interface device includes an input end, an output end, a half-bridge topology circuit, a control unit, and a protection unit. The input end is connected to any one of the DC power supplies, the output end is connected to the bus, and the half-bridge topology circuit is used to control the input and output power of the interface device. The DC power supply is a low-voltage DC power supply, and the half-bridge topology circuit includes a first switching tube, a second switching tube, a first diode, and a second diode. The first diode is connected in parallel with the first switching tube, and the second diode is connected in parallel with the second switching tube. The interface device is rectified by the first diode and the second diode. The first switching tube and the second switching tube are field-effect transistors. The first switching tube and the second switching tube are connected in a totem pole form. The source of the first switching tube and the drain of the second switching tube are respectively connected to the two ends of the DC power supply at the input end, the drain of the first switching tube is connected to the source of the second switching tube, and the midpoint between the first and second switching tubes is connected to the output end as an output. wherein, according to the output voltage of the DC power supply and the bus, the switching states of the first switching tube and the second switching tube are controlled to adjust the input and output power of the interface device; The control unit detects parameter information on the half-bridge topology circuit. When an overcurrent or short circuit is detected in the circuit, the control unit sends a control instruction to the protection unit to control the protection unit to disconnect the first switch tube and / or the second switch tube to achieve active protection in the power supply system. The half-bridge topology circuit in the interface device operates in a high-frequency switching mode, and the interface device utilizes the line inductance included in the busbar for filtering.

2. The interface device according to claim 1, wherein: The control unit includes at least one of a processor, a memory, a power management chip, a digital input and output interface, and an analog input and output interface.

3. The interface device according to claim 1, wherein: The interface device further includes a communication unit and / or a display unit; the control unit controls the communication unit to communicate with the outside, and the control unit controls the display unit to display data information of the interface device.

4. A power supply system, characterized in that: comprising a busbar, a DC power supply, and the interface device according to any one of claims 1 to 3; The DC power supply is connected to the busbar via the interface device, and the half-bridge topology circuit is used to control the input and output power of the interface device.

5. The power supply system according to claim 4, characterized in that: There are multiple DC power supplies and multiple interface devices; Wherein, each of the DC power supplies is connected in parallel to the busbar via one of the interface devices.

6. The power supply system according to claim 4, characterized in that: It also includes an electrical load, which is connected to the DC power supply through a load line.

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