A power supply circuit for underground integrated base station and underground integrated base station

Abstract

The present invention provides a power supply circuit for an underground integrated base station and an underground integrated base station thereof, wherein the power supply circuit for the underground integrated base station comprises: a control circuit, a network communication circuit, a power switch circuit, a voltage detection circuit and a current detection circuit, wherein the network communication circuit and the power switch circuit are respectively connected to the control circuit, the voltage detection circuit is respectively connected to the control circuit and the power switch circuit, and the current detection circuit is respectively connected to the control circuit and the power switch circuit; wherein the power switch circuit comprises a photoelectric coupling circuit and a MOS switch circuit, and the control circuit is connected to the MOS switch circuit via the photoelectric coupling circuit. The present invention can realize switch control, voltage detection and current detection, thereby providing a basis for a safe power supply, and the circuit structure is reasonable, the module of the power supply circuit is light and small, which is convenient for the modular and structural design of the product, and is convenient for realizing functional expansion.

Description

Technical Field

[0001] The present invention relates to a power supply circuit, in particular to a power supply circuit for an underground integrated base station, and to an underground integrated base station adopting the power supply circuit. Background Art

[0002] In underground integrated base stations, explosion-proof refers to a method of preventing explosions under specific hazardous gases. For example, flameproof encapsulation is one form of explosion-proof. The characteristic of explosion-proof is that the equipment is wrapped in a thick metal shell. When an explosion occurs inside, it will not ignite the external flammable gas, but this form of explosion-proof is very bulky. In addition, intrinsic safety is also a form of explosion-proof. It means that when the circuit has one or two faults, the energy after any short circuit is insufficient to detonate the standard gas, but it can only be applied to low-voltage and low-power equipment. Encapsulation is to encapsulate the circuit board with epoxy resin to isolate the flammable gas to achieve explosion-proof. Encapsulated equipment is often very small.

[0003] Any integrated base station system suitable for a mine environment, or any weak-current communication equipment underground, must convert AC to DC. This presents several options: first, complete flameproofing, ensuring protection against AC short-circuits; second, designing the weak-current components for intrinsic safety, using DC power and combining them with a flameproof and intrinsically safe power supply, such as a fully flameproof system with output that meets intrinsically safe standards. However, existing underground base stations rarely use encapsulated power supplies. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a safe and reliable power supply circuit for an underground integrated base station, and preferably further provide an underground integrated base station using the power supply circuit.

[0005] In this regard, the present invention provides a power supply circuit for an underground integrated base station, comprising: a control circuit, a network communication circuit, a power switch circuit, a voltage detection circuit and a current detection circuit, wherein the network communication circuit and the power switch circuit are respectively connected to the control circuit, the voltage detection circuit is respectively connected to the control circuit and the power switch circuit, and the current detection circuit is respectively connected to the control circuit and the power switch circuit; wherein the power switch circuit comprises a photoelectric coupling circuit and a MOS switch circuit, and the control circuit is connected to the MOS switch circuit via the photoelectric coupling circuit.

[0006] A further improvement of the present invention is that the control circuit includes a main control circuit and a burning circuit, and the burning circuit is connected to the MCU of the main control circuit.

[0007] A further improvement of the present invention is that the control circuit further includes a capacitor energy storage circuit, and the capacitor energy storage circuit is connected to the MCU of the main control circuit.

[0008] A further improvement of the present invention is that the network communication circuit includes an Ethernet module circuit, an Ethernet isolation transformer circuit and an Ethernet interface, the control circuit is connected to the Ethernet isolation transformer circuit through the Ethernet module circuit, and the Ethernet isolation transformer circuit is connected to the Ethernet interface.

[0009] A further improvement of the present invention is that the Ethernet interface is a network cable interface.

[0010] A further improvement of the present invention is that the photoelectric coupling circuit includes a resistor R30, a photoelectric coupler U7, a chip fuse F1 and a resistor R31, one end of the resistor R30 is connected to the potential end, the other end of the resistor R30 is connected to the input end of the photoelectric coupler U7, the positive electrode of the output end of the photoelectric coupler U7 is connected to the MOS switch circuit through the chip fuse F1, and the negative electrode of the output end of the photoelectric coupler U7 is grounded through the resistor R31.

[0011] A further improvement of the present invention is that the MOS switch circuit includes a resistor R27, a MOS tube U6, a resistor R28, a transistor Q1, and a resistor R29. The end of the chip fuse F1 away from the photocoupler U7 is respectively connected to one end of the resistor R27 and the source of the MOS tube U6, the other end of the resistor R27 is connected to the gate of the MOS tube U6, the drain of the MOS tube U6 is connected to VCC, one end of the resistor R29 is connected to the negative output terminal of the photocoupler U7, the other end of the resistor R29 is connected to the base of the transistor Q1, the emitter of the transistor Q1 is grounded, and the collector of the transistor Q1 is connected to the gate of the MOS tube U6 through the resistor R28.

[0012] A further improvement of the present invention is that the voltage detection circuit includes a resistor R43, a transistor Q2, a resistor R41, a capacitor C33 and a resistor R42, one end of the resistor R43 is connected to the control circuit, the other end of the resistor R43 is connected to the base of the transistor Q2, the collector of the transistor Q2 is connected to the power switch circuit through the resistor R41, the emitter of the transistor Q2 is grounded through the capacitor C33 and the resistor R42 respectively, and the emitter of the transistor Q2 is connected to the control circuit.

[0013] The present invention also provides an underground integrated base station, which adopts the power supply circuit for the underground integrated base station as described above, and includes a switch module and an expansion module. The power supply circuit for the underground integrated base station is connected to the switch module and the expansion module respectively. The expansion module includes any one or more of a plug-in positioning module, a wifi module, a broadcast module, a sensor acquisition module, an IP telephone module, a wireless communication module and a data transmission module.

[0014] A further improvement of the present invention is that the underground integrated base station includes at least two power supply circuits for the underground integrated base station, one of the power supply circuits for the underground integrated base station is connected to the router and switch module, and the remaining power supply circuits for the underground integrated base station are connected to the expansion module.

[0015] Compared with existing technologies, the present invention offers the following advantages: It designs a power supply circuit for an underground integrated base station that enables switch control, voltage detection, and current detection, thereby providing a hardware circuit foundation for an intrinsically safe power supply. The rational circuit structure makes the power supply circuit module lightweight and compact, facilitating modular and structural product design. Furthermore, the underground integrated base station utilizes switch modules and expansion modules to implement a modular slot design, facilitating functional expansion requirements for the underground integrated base station. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the circuit module structure of an embodiment of the present invention;

[0017] Figure 2 is a circuit schematic diagram of a control circuit according to an embodiment of the present invention;

[0018] Figure 3 is a circuit schematic diagram of a network communication circuit according to an embodiment of the present invention;

[0019] Figure 4 is a circuit schematic diagram of a power switch circuit according to an embodiment of the present invention;

[0020] Figure 5 is a circuit schematic diagram of a voltage detection circuit according to an embodiment of the present invention;

[0021] Figure 6 is a circuit schematic diagram of a current detection circuit according to an embodiment of the present invention;

[0022] Figure 7 This is a schematic structural diagram of an underground integrated base station according to an embodiment of the present invention;

[0023] Figure 8 It is a schematic diagram of the power distribution control principle of an underground integrated base station according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The preferred embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0025] like Figures 1 to 6 As shown, this example provides a power supply circuit for an underground integrated base station, including: a control circuit 1, a network communication circuit 2, a power switch circuit 3, a voltage detection circuit 4 and a current detection circuit 5, the network communication circuit 2 and the power switch circuit 3 are respectively connected to the control circuit 1, the voltage detection circuit 4 is respectively connected to the control circuit 1 and the power switch circuit 3, and the current detection circuit 5 is respectively connected to the control circuit 1 and the power switch circuit 3; wherein, the power switch circuit 3 includes a photoelectric coupling circuit 301 and a MOS switch circuit 302, and the control circuit 1 is connected to the MOS switch circuit 302 through the photoelectric coupling circuit 301.

[0026] Different from the existing technology, this example is a built-in encapsulated and intrinsically safe power supply. The weak current part adopts an intrinsically safe design, and the overall size is small and the weight is light.

[0027] like Figure 2 As shown, the control circuit 1 in this example includes a main control circuit 101, a burning circuit 102 and a capacitor energy storage circuit 103. The burning circuit 102 and the capacitor energy storage circuit 103 are respectively connected to the MCU of the main control circuit 101.

[0028] The main control chip of the power monitoring baseboard of the control circuit 1 in this example is an MCU, preferably an STM32 chip, that is, Figure 2 The main control chip U3 in the control circuit 1 preferably also includes a programming circuit 102 and a capacitor energy storage circuit 103, which is convenient for providing a hardware circuit basis for implementing programming and energy storage. The external connection of the MCU of the main control circuit 101 includes the following Figure 3 and also provides a circuit basis for on-off control and distribution of the encapsulated and intrinsically safe power supply to the functional modules through the power switch circuit 3, such as Figure 4 As shown; Figure 5 The voltage detection circuit 4 shown and Figure 6 The current detection circuit 5 shown also meets the voltage monitoring and current monitoring requirements of the encapsulated and intrinsically safe power supply, and meets the requirements of the underground environment for power supply products.

[0029] like Figure 3As shown, the network communication circuit 2 in this example includes an Ethernet module circuit 201, an Ethernet isolation transformer circuit 202, and an Ethernet interface 203. The control circuit 1 is connected to the Ethernet isolation transformer circuit 202 through the Ethernet module circuit 201, and the Ethernet isolation transformer circuit 202 is connected to the Ethernet interface 203. The Ethernet interface 203 is preferably a network cable interface.

[0030] In this example, the network communication circuit 2 is the network portion of the MCU (STM32) in the main control circuit 101. The Ethernet module chip U4 is an Ethernet physical layer chip, the Ethernet isolation transformer chip U6 is an Ethernet isolation transformer, and the Ethernet interface 203J8 is an RJ45 interface. The MCU (STM32) in the main control circuit 101 is connected to the switch module 6 of the underground integrated base station via the network communication circuit 2 and can interact with the upper-layer server. The underground integrated base station is preferably a underground multi-functional integrated base station.

[0031] like Figure 4 As shown, the optocoupler circuit 301 in this example includes a resistor R30, a photocoupler U7, a chip fuse F1 and a resistor R31. One end of the resistor R30 is connected to the potential end, and the other end of the resistor R30 is connected to the input end of the photocoupler U7. The positive electrode of the output end of the photocoupler U7 is connected to the MOS switch circuit 302 through the chip fuse F1, and the negative electrode of the output end of the optocoupler U7 is grounded through the resistor R31.

[0032] like Figure 4 As shown, the MOS switch circuit 302 in this example includes a resistor R27, a MOS transistor U6, a resistor R28, a transistor Q1, and a resistor R29. The end of the chip fuse F1 away from the photocoupler U7 is respectively connected to one end of the resistor R27 and the source of the MOS transistor U6. The other end of the resistor R27 is connected to the gate of the MOS transistor U6. The drain of the MOS transistor U6 is connected to VCC. One end of the resistor R29 is connected to the negative output terminal of the photocoupler U7. The other end of the resistor R29 is connected to the base of the transistor Q1. The emitter of the transistor Q1 is grounded. The collector of the transistor Q1 is connected to the gate of the MOS transistor U6 through the resistor R28.

[0033] Figure 4 The figure shows a schematic diagram of a power switch circuit 3, which is fixed to the switch module 6 and the power monitoring backplane of the control circuit 1. In actual application, the power switch circuit 3 can be set to two or more groups, such as two to eight groups.

[0034] The power switch circuit 3 in this example is preferably configured as eight groups, which can control the interconnection between the second input power supply, the third input power supply and the second output, the third output, the fourth output and the fifth output, and can cover all power distribution situations. These controls are all implemented by the general IO port of the MCU (STM32) of the main control circuit 101. For example, the MCU (STM32) of the main control circuit 101 can provide the hardware circuit basis for the on-off control between two to three inputs and two to four outputs through a general IO port (SNG1) and then through the optocoupler U7 and the MOS tube U6, such as Figure 8 shown.

[0035] like Figure 5 As shown, the voltage detection circuit 4 in this example includes a resistor R43, a transistor Q2, a resistor R41, a capacitor C33 and a resistor R42, one end of the resistor R43 is connected to the control circuit 1, the other end of the resistor R43 is connected to the base of the transistor Q2, the collector of the transistor Q2 is connected to the power switch circuit 3 through the resistor R41, the emitter of the transistor Q2 is grounded through the capacitor C33 and the resistor R42 respectively, and the emitter of the transistor Q2 is connected to the control circuit 1.

[0036] Figure 5 The figure shows one set of voltage detection circuits 4. The CON1 signal comes from the MCU (STM32) and is usually set low, transistor Q2 (BCW33) is turned off, and the voltage detection circuit 4 is temporarily inoperative. The CON1 signal is briefly set high for a few milliseconds at a cycle of once per second, turning on transistor Q2 (BCW33). By using resistor voltage divider, the voltage of the power supply under test can be reduced to a reasonable range. The TEXT4 signal is connected to the ADC of the MCU (STM32), and the voltage of the power supply under test can be measured through the ADC. Preferably, the power supply circuit described in this example includes five sets of voltage detection circuits 4, each of which is connected to the MCU (STM32) of the main control circuit 101, that is, connected to the MCU (STM32) through CON1 to CON5.

[0037] Figure 6 The figure shows one set of current detection circuits 5. The negative pole of each power supply is connected to a high-precision 0.39 ohm resistor. Figure 6 In the example, H1 and H2 represent the positive and negative output terminals. When the output is connected to a load, current flows through resistor R33, and TEXT1 reaches a corresponding level. TEXT1 is also connected to the STM32 ADC, and the current of the power supply under test can be obtained through conversion. Preferably, the power supply circuit in this example also includes five sets of current detection circuits 5, each of which is connected to the MCU (STM32) of the main control circuit 101.

[0038] like Figure 7 and Figure 8 As shown, this example also provides an underground integrated base station, which adopts the power supply circuit for the underground integrated base station as described above, and includes a switch module 6 and an expansion module 7. The power supply circuit for the underground integrated base station is respectively connected to the switch module 6 and the expansion module 7, and the expansion module 7 includes any one or more of a plug-in positioning module, a wifi module, a broadcast module, a sensor acquisition module, an IP telephone module, a wireless communication module and a data transmission module.

[0039] The underground integrated base station in this example includes at least two power supply circuits for the underground integrated base station, one of which is connected to the router and switch module 6, and the remaining power supply circuits for the underground integrated base station are connected to the expansion module 7.

[0040] The characteristic of this example is that all the modules of the underground integrated base station are designed to be intrinsically safe. In addition to the switch function of the core switch module 6, four slots (four expansion modules 7) are preferably expanded for expansion use, namely the expansion modules 7. These slots can be used to accommodate functions such as positioning, WIFI, 485 data transmission, and IP telephone. The underground preferably includes three power supply circuits for the underground integrated base station, one of which is connected to the router and the switch module 6, and the other two are connected to the expansion modules 7 to realize slot power supply. Since the power required for each business plug-in board is different, the underground integrated base station in this example has a set of power monitoring / distribution circuits, which can provide two power supplies to the four slots (four expansion modules 7) in any combination of arrangements, such as Figure 8 shown.

[0041] Therefore, this embodiment facilitates installation and reduces the difficulty of debugging and maintenance, while maintaining neat and aesthetically pleasing wiring. Furthermore, because the power supply circuit utilizes an intrinsically safe design and includes a built-in, encapsulated, and intrinsically safe power supply, the design is significantly smaller than traditional flameproof or flameproof and intrinsically safe designs, and weighs less than one-third of these existing designs. This power supply circuit can also effectively accommodate the varying power requirements of the expansion module 7's plug-in boards.

[0042] like Figure 7As shown, the underground integrated base station described in this example is primarily composed of a series of pluggable boards. The first board from the left is a switch module 6; the four subsequent expansion modules 7 allow for flexible combinations and can be any one or more of the following: positioning module, Wi-Fi module, broadcast module, sensor acquisition module, IP phone module, wireless communication module, and data transmission modules such as CAN / 485. On the far right are three independent, encapsulated, intrinsically safe power supply modules 8, which power the underground integrated base station and are used to configure the power supply circuit.

[0043] like Figure 8 As shown, three independent, encapsulated, and intrinsically safe power supply modules 8 power multiple modules via the control circuit 1. Due to intrinsic safety requirements, two or more power supply circuits cannot be combined. Therefore, the power monitoring backplane of the control circuit 1 can only split one or more specific power supply circuits. The router and the power monitoring backplane's circuitry are powered by one of these power supply circuits, while the other two power supply circuits can be freely allocated.

[0044] By turning the first to fourth power switch circuits on or off, the second input power supply can be distributed to any one or more of the second to fifth outputs. By turning the fifth to eighth switch circuits on or off, the third input power supply can be distributed to one or more of the second to fifth outputs. This distribution method is very flexible. For example, if the second output requires a heavy-load module, the second and third input power supplies can be directed to supply power simultaneously. If both are light-load modules, they can be supplied separately. In addition, the power switch circuit 3 can also be remotely controlled to forcibly power off or restart the load module, which helps diagnose and troubleshoot system faults. Figure 8 The middle arrows indicate possible paths of current, and the control module 1 controls its power monitoring backplane.

[0045] In summary, this example designs a power supply circuit for an underground integrated base station, capable of implementing switch control, voltage detection, and current detection, thereby providing a hardware circuit foundation for an intrinsically safe power supply. The circuit structure is rational, making the power supply circuit module light and small, facilitating the modular and structural design of the product. Furthermore, the underground integrated base station can implement a modular slot design through the switch module 6 and expansion module 7, facilitating the functional expansion requirements of the underground integrated base station.

[0046] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A power supply circuit for an underground integrated base station, characterized in that: include: A control circuit, a network communication circuit, a power switch circuit, a voltage detection circuit and a current detection circuit, wherein the network communication circuit and the power switch circuit are respectively connected to the control circuit, the voltage detection circuit is respectively connected to the control circuit and the power switch circuit, and the current detection circuit is respectively connected to the control circuit and the power switch circuit; wherein the power switch circuit comprises a photoelectric coupling circuit and a MOS switch circuit, and the control circuit is connected to the MOS switch circuit via the photoelectric coupling circuit; The photoelectric coupling circuit includes a resistor R30, a photoelectric coupler U7, a chip fuse F1 and a resistor R31, one end of the resistor R30 is connected to the potential end, the other end of the resistor R30 is connected to the input end of the photoelectric coupler U7, the positive electrode of the output end of the photoelectric coupler U7 is connected to the MOS switch circuit through the chip fuse F1, and the negative electrode of the output end of the photoelectric coupler U7 is grounded through the resistor R31; The MOS switch circuit includes a resistor R27, a MOS tube U6, a resistor R28, a transistor Q1, and a resistor R29. One end of the chip fuse F1 away from the photocoupler U7 is respectively connected to one end of the resistor R27 and the source of the MOS tube U6. The other end of the resistor R27 is connected to the gate of the MOS tube U6. The drain of the MOS tube U6 is connected to VCC. One end of the resistor R29 is connected to the negative output end of the photocoupler U7. The other end of the resistor R29 is connected to the base of the transistor Q1. The emitter of the transistor Q1 is grounded. The collector of the transistor Q1 is connected to the gate of the MOS tube U6 through the resistor R28. The voltage detection circuit includes a resistor R43, a transistor Q2, a resistor R41, a capacitor C33 and a resistor R42, one end of the resistor R43 is connected to the control circuit, the other end of the resistor R43 is connected to the base of the transistor Q2, the collector of the transistor Q2 is connected to the power switch circuit through the resistor R41, the emitter of the transistor Q2 is grounded through the capacitor C33 and the resistor R42 respectively, and the emitter of the transistor Q2 is connected to the control circuit.

2. The power supply circuit for underground integrated base station according to claim 1, characterized in that: The control circuit comprises a main control circuit and a burning circuit, and the burning circuit is connected to the MCU of the main control circuit.

3. The power supply circuit for underground integrated base station according to claim 2, characterized in that: The control circuit also includes a capacitor energy storage circuit, and the capacitor energy storage circuit is connected to the MCU of the main control circuit.

4. The power supply circuit for an underground integrated base station according to any one of claims 1 to 3, characterized in that: The network communication circuit includes an Ethernet module circuit, an Ethernet isolation transformer circuit and an Ethernet interface. The control circuit is connected to the Ethernet isolation transformer circuit through the Ethernet module circuit, and the Ethernet isolation transformer circuit is connected to the Ethernet interface.

5. The power supply circuit for underground integrated base station according to claim 4, characterized in that: The Ethernet interface is a network cable interface.

6. An underground integrated base station, characterized in that: The power supply circuit for the underground integrated base station as described in any one of claims 1 to 5 is adopted, and includes a switch module and an expansion module. The power supply circuit for the underground integrated base station is connected to the switch module and the expansion module respectively. The expansion module includes any one or more of a plug-in positioning module, a wifi module, a broadcast module, a sensor acquisition module, an IP telephone module, a wireless communication module and a data transmission module.

7. The underground integrated base station according to claim 6, characterized in that: The underground integrated base station includes at least two power supply circuits for the underground integrated base station, one of which is connected to the router and switch module, and the other is connected to the expansion module.

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