Active field bus distributor

Abstract

The utility model provides an active field bus distributor. The active field bus distributor comprises a trunk line interface protection module which comprises a trunk line interface protection input module and a trunk line interface protection output module; the output end of the trunk line interface protection input module is connected with the input end of the trunk line current detection module; the detection output end of the main line current detection module is connected with the detection input end of the main line short circuit detection control module; the power output end of the main line current detection module is connected with the power input end of the main line short circuit detection control module. The power output end of the trunk line short circuit detection control module is connected with the power input end of the trunk line interface protection output module. The active fieldbus distributor can quickly diagnose the short-circuit state of a main line and a branch line by using LED state indication, automatically isolates a fault section, and ensures the safe operation of a system due to the multiple protection functions of the distributor.

Description

Technical Field

[0001] This utility model relates to the field of electronic circuit technology, and in particular to an active fieldbus distributor. Background Technology

[0002] Active fieldbus distributors (junction boxes) are key components in industrial automation systems used to connect fieldbus devices to the main control system. Existing devices have a maximum of eight electrical connectors to enable bidirectional digital signal transmission between field devices (such as sensors or actuators) and controllers (such as PLCs or DCS). For example, the FF bus junction box patent disclosed in CN102570433A can only operate in an FF bus environment and lacks bus end status indication, automatic isolation of fault sections, and multiple protection functions of the distributor. This necessitates that those skilled in the art solve the corresponding technical problems. Utility Model Content

[0003] This utility model aims to at least solve the technical problems existing in the prior art, and in particular, innovatively proposes an active fieldbus distributor.

[0004] To achieve the above-mentioned objectives of this utility model, this utility model provides an active fieldbus distributor, comprising:

[0005] The main line unit includes: a main line interface protection module, a main line current detection module, and a main line short circuit detection and control module;

[0006] The trunk interface protection module includes a trunk interface protection input module and a trunk interface protection output module;

[0007] The output terminal of the main line interface protection input module is connected to the input terminal of the main line current detection module;

[0008] The detection output terminal of the main line current detection module is connected to the detection input terminal of the main line short circuit detection control module;

[0009] The power output terminal of the main line current detection module is connected to the power input terminal of the main line short circuit detection control module.

[0010] The power output terminal of the main line short circuit detection and control module is connected to the power input terminal of the main line interface protection output module.

[0011] In a preferred embodiment of the present invention, the mainline interface protection input module includes: a first end of a Trunkin port J1 connected to a first end of a gas discharge tube D4 and a first end of a fuse F1; a second end of a fuse F1 connected to a first end of a transient suppression diode D5, a first end of a capacitor C2, and a first end of an inductor L1; a second end of a capacitor C2 grounded; a second end of a Trunkin port J1 connected to the control terminal of a gas discharge tube D4 and grounded; a third end of a Trunkin port J1 connected to a second end of a gas discharge tube D4, a second end of a transient suppression diode D5, a first end of a capacitor C6, and a second end of an inductor L1; a second end of a capacitor C6 grounded; a third end of an inductor L1 connected to the drain of a field-effect transistor Q13; and a fourth end of an inductor L1 grounded.

[0012] The main line interface protection output module includes: the first end of inductor L2 is connected to the drain of field-effect transistor Q2;

[0013] The second terminal of inductor L2 is connected to the first terminal of capacitor C1, the first terminal of transient suppression diode D6, the first terminal of gas discharge tube D3, and the first terminal of TrunkOut port J2. The second terminal of capacitor C1 is grounded.

[0014] The third terminal of inductor L2 is connected to the first terminal of capacitor C7, the second terminal of transient suppression diode D6, the second terminal of gas discharge tube D3, and the third terminal of TrunkOut port J2. The second terminal of capacitor C7 is grounded.

[0015] The fourth terminal of inductor L2 is grounded;

[0016] The second terminal of TrunkOut port J2 is connected to the control terminal of gas discharge tube D3 and grounded.

[0017] In a preferred embodiment of the present invention, the main line current detection module includes: the drain of the field-effect transistor Q13 is connected to the third terminal of the inductor L1, the source of the field-effect transistor Q13 is connected to the negative terminal of the diode D21 and outputs power supply FF+, and the source of the field-effect transistor Q13 is connected to the first terminal of the resistor R1, the first terminal of the resistor R3, the voltage input terminal Vin+ of the detector U4, and the voltage input terminal Vin+ of the detector U2.

[0018] The second end of resistor R1 is connected to the second end of resistor R3, the voltage input terminal Vin- of detector U4, the voltage input terminal Vin- of detector U2, and the source of field-effect transistor Q2;

[0019] The ground terminal GND of detector U2 is connected to the first terminal of resistor R10 and grounded;

[0020] The signal output terminal OUT of detector U2 is connected to the second terminal of resistor R10 and the first terminal of resistor R11;

[0021] The power supply terminal V+ of detector U2 is connected to a 3.3V power supply, the second terminal of resistor R11, and the first terminal of capacitor C8. The second terminal of capacitor C8 is grounded.

[0022] The first terminal of resistor R98 is connected to the first terminal of resistor R9, the ground terminal GND of detector U4, and grounded.

[0023] The second terminal of resistor R98 is connected to the positive terminal of diode D21 and the gate of field-effect transistor Q13;

[0024] The power supply terminal V+ of detector U4 is connected to a 3.3V power supply;

[0025] The signal output terminal OUT of detector U4 is connected to the first terminal of resistor R14 and the second terminal of resistor R9. The second terminal of resistor R14 is connected to the inverting input terminal of amplifier U5A.

[0026] In a preferred embodiment of the present invention, the main line short-circuit detection and control module includes: the inverting input terminal of amplifier U5A is connected to the second terminal of resistor R14 and connected to the first terminal of capacitor C10, and the second terminal of capacitor C10 is grounded.

[0027] The non-inverting input terminal of amplifier U5A is connected to the first terminal of resistor R22, the first terminal of capacitor C14, and the first terminal of resistor R19.

[0028] The second terminal of resistor R22 is connected to the second terminal of capacitor C14 and grounded; the second terminal of resistor R19 is connected to a 3.3V power supply.

[0029] The negative power supply terminal of amplifier U5A is grounded, and the positive power supply terminal of amplifier U5A is connected to a 3.3V power supply.

[0030] Timer U7 starts the timing input terminal Connect the signal output terminal of amplifier U5A;

[0031] The threshold terminal THR of timer U7 is connected to the end timing turn-on terminal DISC of timer U7;

[0032] Timer U7 control terminal Connect the first terminal of capacitor C5, and ground the second terminal of capacitor C5.

[0033] Timer U7 Force Reset Terminal Connect to a 3.3V power supply;

[0034] The ground terminal GND of timer U7 is connected to the first terminal of capacitor C15 and grounded, and the second terminal of capacitor C15 is connected to the 3.3V power supply.

[0035] The power supply terminal VDD of timer U7 is connected to the first terminal of resistor R20 and the 3.3V power supply.

[0036] The timer U7's timing end DISC terminal is connected to the second terminal of resistor R20 and the first terminal of capacitor C13, with the second terminal of capacitor C13 grounded.

[0037] The output terminal OUT of timer U7 is connected to the signal input terminal A of inverter U25;

[0038] The inverter U25's power supply terminal VCC is connected to a 3.3V power supply;

[0039] Inverter U25 ground terminal GND is grounded;

[0040] The signal output terminal Y of inverter U25 is connected to the first terminal of resistor R23, and the second terminal of resistor R23 is connected to the base of transistor Q3.

[0041] The emitter of transistor Q3 is grounded;

[0042] The collector of transistor Q3 is connected to the second terminal of resistor R76 and the base of transistor Q12;

[0043] The first end of resistor R76 is connected to the collector of transistor Q12, the cathode of diode D22, the source of field-effect transistor Q2, and the second end of resistor R3.

[0044] The emitter of transistor Q12 is connected to the positive terminal of diode D22, the gate of field-effect transistor Q2, and the first terminal of resistor R7;

[0045] The second terminal of resistor R7 is connected to the first terminal of capacitor C4 and grounded;

[0046] The second terminal of capacitor C4 is connected to the drain of field-effect transistor Q2 and the first terminal of inductor L2.

[0047] In a preferred embodiment of the present invention, a trunk line indicator module is also included. The trunk line indicator module includes: the non-inverting input terminal of amplifier U5B is connected to the first terminal of capacitor C9 and the first terminal of resistor R15, and the second terminal of resistor R15 is connected to the first terminal of resistor R11.

[0048] The second terminal of capacitor C9 is grounded;

[0049] The inverting input of amplifier U5B is connected to the first terminal of capacitor C12, the first terminal of resistor R21, and the first terminal of resistor R17. The second terminal of resistor R21 is connected to the second terminal of capacitor C12 and grounded. The second terminal of resistor R17 is connected to a 3.3V power supply.

[0050] The signal output terminal of amplifier U5B is connected to the first terminal of resistor R16, and the second terminal of resistor R16 is connected to the first input terminal of LED indicator D7.

[0051] The second input terminal of LED indicator D7 is connected to the first terminal of resistor R13, the second terminal of resistor R13 is connected to the signal output terminal OUT of timer U7, and the ground terminal of LED indicator D7 is grounded.

[0052] It also includes a terminating resistor module, which includes: the control terminal A of the optocoupler relay U1 is connected to the first terminal of the resistor R4, and the second terminal of the resistor R4 is connected to the 3.3V power supply.

[0053] The voltage output terminal V1 of the optocoupler relay U1 is connected to the first terminal of resistor R5, the second terminal of resistor R5 is connected to the first terminal of capacitor C3, and the second terminal of capacitor C3 is grounded.

[0054] The voltage input terminal V2 of the optocoupler relay U1 is connected to the power supply FF+;

[0055] The control terminal K of the optocoupler relay U1 is connected to the first terminal of the resistor R16.

[0056] In a preferred embodiment of the present invention, the 3.3V power supply is output by a power supply module, the power supply module comprising: the voltage output terminal OUT of the voltage regulator U6 connected to the first terminal of capacitor C25, the first terminal of capacitor C27 and the 3.3V power supply;

[0057] The second terminal of capacitor C25 is connected to the second terminal of capacitor C27 and grounded; the ground terminal GND of voltage regulator U6 is grounded; the voltage input terminal IN of voltage regulator U6 is connected to the enable terminal EN of voltage regulator U6, the first terminal of resistor R12, the first terminal of capacitor C11, the first terminal of capacitor E1, and the first terminal of inductor L7; the second terminal of resistor R12 is connected to the first terminal of resistor R18 and the feedback terminal FB of converter U8; the second terminal of capacitor E1 is connected to the second terminal of capacitor C11 and the second terminal of resistor R18 and grounded; the second terminal of inductor L7... Connect the negative terminal of diode D20, the first terminal of capacitor C69, and the switching terminal SW of converter U8; ground the positive terminal of diode D20; connect the second terminal of capacitor C69 to the capacitor terminal BST of converter U8; ground the ground terminal GND of converter U8; connect the voltage input terminal VIN of converter U8 to the enable terminal EN of converter U8, the first terminal of capacitor C70, the first terminal of capacitor E2, and the first terminal of inductor L8; connect the second terminal of capacitor C70 to the second terminal of capacitor E2 and ground; connect the second terminal of inductor L8 to the power supply FF+.

[0058] In a preferred embodiment of the present invention, a branch unit is also included.

[0059] The branch unit includes: a branch interface protection module, a branch overcurrent detection and control module, a branch short circuit detection and control module, and a branch indicator module;

[0060] The output terminal of the branch interface protection module is connected to the input terminal of the branch overcurrent detection control module and the input terminal of the branch short circuit detection control module, respectively.

[0061] The control terminal of the branch short circuit detection control module is connected to the control terminal of the branch overcurrent detection control module;

[0062] The output terminal of the branch overcurrent detection control module is connected to the first detection input terminal of the branch indicator module;

[0063] The output of the branch short-circuit detection and control module is connected to the second detection input of the branch indicator module.

[0064] In a preferred embodiment of the present invention, the branch interface protection module includes: the first end of the power port J3 is connected to the first end of the capacitor C38 and the first end of the inductor L3, and the second end of the capacitor C38 is grounded;

[0065] The second terminal of power port J3 is grounded;

[0066] The third terminal of power port J3 is connected to the first terminal of capacitor C45 and the second terminal of inductor L3, and the second terminal of capacitor C45 is grounded.

[0067] The third terminal of inductor L3 is connected to the negative terminal of diode D8 and the power supply FF+, and the positive terminal of diode D8 is grounded.

[0068] The fourth terminal of inductor L3 is connected to the negative terminal of diode D10, the collector of transistor Q4, and the second terminal of resistor R79. The positive terminal of diode D10 is grounded.

[0069] In a preferred embodiment of the present invention, the branch overcurrent detection and control module includes: the collector of transistor Q4 is connected to the fourth terminal of inductor L3;

[0070] The base of transistor Q4 is connected to the collector of transistor Q8 and the first terminal of resistor R26;

[0071] The non-inverting input terminal of amplifier U9A is connected to the first terminal of resistor R24, the first terminal of resistor R30, and the first terminal of capacitor C46. The second terminal of resistor R24 ​​is connected to a 3.3V power supply.

[0072] The positive terminal of the power supply of amplifier U9A is connected to the first terminal of capacitor C42 and the 3.3V power supply, and the second terminal of capacitor C42 is grounded.

[0073] The second terminal of resistor R30 is connected to the second terminal of capacitor C46 and grounded;

[0074] The inverting input terminal of amplifier U9A is connected to the emitter of transistor Q4, the first terminal of resistor R40, and the first terminal of resistor R36;

[0075] The negative power supply terminal of amplifier U9A is grounded;

[0076] The signal output terminal of amplifier U9A is connected to the second terminal of resistor R26;

[0077] The second terminal of resistor R40 is grounded.

[0078] In a preferred embodiment of the present invention, the branch indicator module includes: the first end of resistor R36 is connected to the emitter of transistor Q4;

[0079] The second end of resistor R36 is connected to the first end of capacitor C50 and the non-inverting input of amplifier U9B, and the second end of capacitor C50 is grounded.

[0080] The inverting input terminal of amplifier U9B is connected to the first terminal of resistor R42 and the first terminal of resistor R43, and the second terminal of resistor R42 is grounded.

[0081] The second end of resistor R43 is connected to the signal output terminal of amplifier U9B, the non-inverting input terminal of amplifier U10B, and the inverting input terminal of amplifier U10A;

[0082] The inverting input terminal of amplifier U10B is connected to the first terminal of capacitor C52, the first terminal of resistor R47, and the first terminal of resistor R46.

[0083] The second terminal of capacitor C52 is connected to the second terminal of resistor R47 and grounded; the second terminal of resistor R46 is connected to a 3.3V power supply.

[0084] The signal output terminal of amplifier U10B is connected to the signal input terminal B of logic U13;

[0085] The non-inverting input terminal of amplifier U10A is connected to the first terminal of capacitor C48, the first terminal of resistor R32, and the first terminal of resistor R28.

[0086] The second terminal of capacitor C48 is connected to the second terminal of resistor R32 and grounded; the second terminal of resistor R28 is connected to a 3.3V power supply.

[0087] The positive terminal of amplifier U10A is connected to a 3.3V power supply, and the negative terminal of amplifier U10A is grounded.

[0088] The signal output terminal of amplifier U10A is connected to the signal input terminal A of logic U13 and the signal input terminal B of logic U27.

[0089] The power supply terminal VCC of logic U13 is connected to a 3.3V power supply, and the ground terminal GND of logic U13 is grounded.

[0090] The signal output terminal Y of logic U13 is connected to the first terminal of resistor R38, and the second terminal of resistor R38 is connected to the first input terminal of indicator D12.

[0091] Indicator light D12 grounding terminal is grounded;

[0092] The ground terminal GND of logic unit U27 is grounded;

[0093] The signal output terminal Y of logic U27 is connected to the first terminal of resistor R34, and the second terminal of resistor R34 is connected to the second input terminal of indicator D12.

[0094] The signal input terminal A of logic unit U27 is connected to the signal output terminal of amplifier U11;

[0095] The power supply terminal VCC of logic unit U27 is connected to a 3.3V power supply;

[0096] The branch short-circuit detection and control module includes: the second terminal of resistor R79 is connected to the fourth terminal of inductor L3;

[0097] The collector of transistor Q8 is connected to the base of transistor Q4;

[0098] The base of transistor Q8 is connected to the first terminal of resistor R78 and the first terminal of capacitor C65. The second terminal of capacitor C65 is connected to the emitter of transistor Q8 and grounded. The second terminal of resistor R78 is connected to the signal output terminal Y of logic U26.

[0099] The non-inverting input terminal of amplifier U11 is connected to the first terminal of capacitor C33, the first terminal of resistor R88, and the first terminal of resistor R87.

[0100] The second terminal of capacitor C33 is connected to the second terminal of resistor R88 and grounded; the second terminal of resistor R87 is connected to a 3.3V power supply.

[0101] The inverting input terminal of amplifier U11 is connected to the first terminal of capacitor C32, the first terminal of resistor R86, and the first terminal of resistor R79.

[0102] The second terminal of resistor R86 is connected to the second terminal of capacitor C32 and grounded;

[0103] The positive power supply terminal of amplifier U11 is connected to a 3.3V power supply, and the negative power supply terminal of amplifier U11 is grounded.

[0104] The ground terminal GND of logic unit U26 is grounded;

[0105] The power supply terminal VCC of logic unit U26 is connected to a 3.3V power supply;

[0106] The signal output terminal of amplifier U11 is connected to the signal input terminal A of logic U27 and the signal input terminal A of logic U26.

[0107] In summary, due to the adoption of the above technical solutions, the beneficial effects of this utility model are as follows: the gas discharge tube, fuse, and transient suppression diode in the main line interface protection module can prevent excessive continuous current and lightning strikes; the main line current detection module and the main line short circuit detection control module can realize the opening and closing of voltage output to ensure line safety; in addition, the terminal resistor module automatically determines whether there is equipment connected at the back end of the main line output interface. When it is determined that no equipment is connected, the field distributor will automatically activate the terminal matching resistor to open the terminal at the end of the main line of the bus to ensure that the instruments on the bus can work stably.

[0108] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0109] The above-described additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0110] Figure 1 This is a schematic block diagram of the overall connection of this utility model.

[0111] Figure 2 This is a schematic diagram of the FF master station connection of this utility model.

[0112] Figure 3 This is a schematic diagram of the DP master station connection of this utility model.

[0113] Figure 4 This is a schematic diagram of the circuit connection of the distributor of this utility model.

[0114] Figure 5 This is a schematic diagram of the main circuit connection of this utility model.

[0115] Figure 6 This is a schematic diagram of the branch circuit connection of this utility model.

[0116] Figure 7 This is a schematic diagram of the circuit connection of the terminal resistor module of this utility model.

[0117] Figure 8 This is a schematic diagram of the circuit connection of the main line indicator module of this utility model.

[0118] Figure 9 This is a schematic diagram of the circuit connection of the power module of this utility model. Detailed Implementation

[0119] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0120] like Figures 1 to 9 As shown, this utility model discloses an active fieldbus distributor, which includes a power module, a trunk unit, a branch unit, and a terminating resistor module.

[0121] like Figure 1 As shown, the power supply module is connected to the main line unit, the branch line unit, and the terminating resistor module, respectively.

[0122] like Figure 2 and Figure 3 As shown: The FF master station connects to the bus power bus terminal via the FF bus signal interaction terminal, and the FF bus connects to each active fieldbus distributor. Alternatively, the DP master station connects to the coupler signal interaction terminal via the DP bus signal interaction terminal, and the coupler connects to each active fieldbus distributor via the PA bus. These connection methods enable active fieldbus distributors suitable for FOUNDATION H1 and PROFIBUS PA fieldbus applications.

[0123] like Figure 4 The diagram shows the wiring configuration of an active fieldbus distributor. Trunk in is connected to the bus input terminal, and Trunkout is connected to the bus output terminal. This bus is preferably an FF bus or a PA bus. The terminating resistor monitors the signal in real time and provides feedback to the LED status indicator. Each branch can connect 2, 4, 8, 12...n lines, which can promptly detect abnormal sensor or transmitter status. When multiple sensor or transmitter branches are connected, the terminating resistor remains closed when the last sensor or transmitter is identified as connected.

[0124] like Figure 5 The diagram shows the connection details of the main unit circuit of the active fieldbus distributor.

[0125] The first end of the Trunkin port J1 is connected to the first end of the gas discharge tube D4 and the first end of the fuse F1;

[0126] The second terminal of fuse F1 is connected to the first terminal of transient suppression diode D5, the first terminal of capacitor C2, and the first terminal of inductor L1. The second terminal of capacitor C2 is grounded.

[0127] The second end of Trunkin port J1 is connected to the control terminal of gas discharge tube D4 and grounded;

[0128] The third terminal of Trunkin port J1 is connected to the second terminal of gas discharge tube D4, the second terminal of transient suppression diode D5, the first terminal of capacitor C6, and the second terminal of inductor L1. The second terminal of capacitor C6 is grounded.

[0129] The third terminal of inductor L1 is connected to the drain of field-effect transistor Q13. The source of field-effect transistor Q13 is connected to the negative terminal of diode D21 and outputs power supply FF+. The source of field-effect transistor Q13 is connected to the first terminal of resistor R1, the first terminal of resistor R3, the voltage input terminal Vin+ of detector U4, and the voltage input terminal Vin+ of detector U2.

[0130] The second end of resistor R1 is connected to the second end of resistor R3, the voltage input terminal Vin- of detector U4, the voltage input terminal Vin- of detector U2, and the first end of resistor R76;

[0131] The ground terminal GND of detector U2 is connected to the first terminal of resistor R10 and grounded;

[0132] The signal output terminal OUT of detector U2 is connected to the second terminal of resistor R10 and the first terminal of resistor R11;

[0133] The power supply terminal V+ of detector U2 is connected to a 3.3V power supply, the second terminal of resistor R11, and the first terminal of capacitor C8. The second terminal of capacitor C8 is grounded.

[0134] The fourth terminal of inductor L1 is connected to the first terminal of resistor R98, the first terminal of resistor R9, and the ground terminal GND of detector U4, and then grounded.

[0135] The second terminal of resistor R98 is connected to the positive terminal of diode D21 and the gate of field-effect transistor Q13;

[0136] The power supply terminal V+ of detector U4 is connected to a 3.3V power supply;

[0137] The signal output terminal OUT of detector U4 is connected to the first terminal of resistor R14 and the second terminal of resistor R9. The second terminal of resistor R14 is connected to the first terminal of capacitor C10 and the inverting input terminal of amplifier U5A. The second terminal of capacitor C10 is grounded.

[0138] The non-inverting input terminal of amplifier U5A is connected to the first terminal of resistor R22, the first terminal of capacitor C14, and the first terminal of resistor R19.

[0139] The second terminal of resistor R22 is connected to the second terminal of capacitor C14 and grounded; the second terminal of resistor R19 is connected to a 3.3V power supply.

[0140] The negative power supply terminal of amplifier U5A is grounded, and the positive power supply terminal of amplifier U5A is connected to a 3.3V power supply.

[0141] Timer U7 starts the timing input terminal Connect the signal output terminal of amplifier U5A;

[0142] The threshold terminal THR of timer U7 is connected to the end timing turn-on terminal DISC of timer U7;

[0143] Timer U7 control terminal Connect the first terminal of capacitor C5, and ground the second terminal of capacitor C5.

[0144] Timer U7 Force Reset Terminal Connect to a 3.3V power supply;

[0145] The ground terminal GND of timer U7 is connected to the first terminal of capacitor C15 and grounded, and the second terminal of capacitor C15 is connected to the 3.3V power supply.

[0146] The power supply terminal VDD of timer U7 is connected to the first terminal of resistor R20 and the 3.3V power supply.

[0147] The timer U7's timing end DISC terminal is connected to the second terminal of resistor R20 and the first terminal of capacitor C13, with the second terminal of capacitor C13 grounded.

[0148] The output terminal OUT of timer U7 is connected to the signal input terminal A of inverter U25;

[0149] The inverter U25's power supply terminal VCC is connected to a 3.3V power supply;

[0150] Inverter U25 ground terminal GND is grounded;

[0151] The signal output terminal Y of inverter U25 is connected to the first terminal of resistor R23, and the second terminal of resistor R23 is connected to the base of transistor Q3.

[0152] The emitter of transistor Q3 is grounded;

[0153] The collector of transistor Q3 is connected to the second terminal of resistor R76 and the base of transistor Q12;

[0154] The first terminal of resistor R76 is connected to the collector of transistor Q12, the cathode of diode D22, and the source of field-effect transistor Q2;

[0155] The emitter of transistor Q12 is connected to the positive terminal of diode D22, the gate of field-effect transistor Q2, and the first terminal of resistor R7;

[0156] The second terminal of resistor R7 is connected to the first terminal of capacitor C4 and grounded;

[0157] The second terminal of capacitor C4 is connected to the drain of field-effect transistor Q2 and the first terminal of inductor L2;

[0158] The second terminal of inductor L2 is connected to the first terminal of capacitor C1, the first terminal of transient suppression diode D6, the first terminal of gas discharge tube D3, and the first terminal of TrunkOut port J2. The second terminal of capacitor C1 is grounded.

[0159] The third terminal of inductor L2 is connected to the first terminal of capacitor C7, the second terminal of transient suppression diode D6, the second terminal of gas discharge tube D3, and the third terminal of TrunkOut port J2. The second terminal of capacitor C7 is grounded.

[0160] The fourth terminal of inductor L2 is grounded;

[0161] The second end of TrunkOut port J2 is connected to the control end of gas discharge tube D3 and grounded;

[0162] After the main line unit is connected to the power supply, the transient suppression diode D5 and the gas discharge tube D4 work together to protect the interface. The detector U4, amplifier U5A and timer U7 judge the signal to determine whether the current is overloaded. This circuit detection module can detect current of 8mA or 60mA. It can cut off branches exceeding 1A after a short circuit. On the other hand, if the current of the sensor or transmitter is very large, it will only accept 1A.

[0163] The detectors U2 and U4 mentioned above are of model number INA138, the timer U7 is of model number TLC555ID, the inverter U25 is of model number SN74LVC1G04, and the amplifier U5A is of model number AD8542.

[0164] like Figure 6 The diagram shown illustrates the specific connection method of the branch circuit of this utility model:

[0165] The first terminal of power port J3 is connected to the first terminal of capacitor C38 and the first terminal of inductor L3, and the second terminal of capacitor C38 is grounded.

[0166] The second terminal of power port J3 is grounded;

[0167] The third terminal of power port J3 is connected to the first terminal of capacitor C45 and the second terminal of inductor L3, and the second terminal of capacitor C45 is grounded.

[0168] The third terminal of inductor L3 is connected to the negative terminal of diode D8 and the power supply FF+, and the positive terminal of diode D8 is grounded.

[0169] The fourth terminal of inductor L3 is connected to the negative terminal of diode D10 and the collector of transistor Q4, and the positive terminal of diode D10 is grounded.

[0170] The base of transistor Q4 is connected to the collector of transistor Q8 and the first terminal of resistor R26;

[0171] The non-inverting input terminal of amplifier U9A is connected to the first terminal of resistor R24, the first terminal of resistor R30, and the first terminal of capacitor C46. The second terminal of resistor R24 ​​is connected to a 3.3V power supply.

[0172] The positive terminal of the power supply of amplifier U9A is connected to the first terminal of capacitor C42 and the 3.3V power supply, and the second terminal of capacitor C42 is grounded.

[0173] The second terminal of resistor R30 is connected to the second terminal of capacitor C46 and grounded;

[0174] The inverting input terminal of amplifier U9A is connected to the emitter of transistor Q4, the first terminal of resistor R40, and the first terminal of resistor R36;

[0175] The negative power supply terminal of amplifier U9A is grounded;

[0176] The signal output terminal of amplifier U9A is connected to the second terminal of resistor R26;

[0177] The base of transistor Q8 is connected to the first terminal of resistor R78 and the first terminal of capacitor C65. The second terminal of capacitor C65 is connected to the emitter of transistor Q8 and grounded. The second terminal of resistor R78 is connected to the signal output terminal Y of logic U26.

[0178] The second terminal of resistor R40 is grounded;

[0179] The second end of resistor R36 is connected to the first end of capacitor C50 and the non-inverting input of amplifier U9B, and the second end of capacitor C50 is grounded.

[0180] The inverting input terminal of amplifier U9B is connected to the first terminal of resistor R42 and the first terminal of resistor R43, and the second terminal of resistor R42 is grounded.

[0181] The second end of resistor R43 is connected to the signal output terminal of amplifier U9B, the non-inverting input terminal of amplifier U10B, and the inverting input terminal of amplifier U10A;

[0182] The inverting input terminal of amplifier U10B is connected to the first terminal of capacitor C52, the first terminal of resistor R47, and the first terminal of resistor R46.

[0183] The second terminal of capacitor C52 is connected to the second terminal of resistor R47 and grounded; the second terminal of resistor R46 is connected to a 3.3V power supply.

[0184] The signal output terminal of amplifier U10B is connected to the signal input terminal B of logic U13;

[0185] The non-inverting input terminal of amplifier U10A is connected to the first terminal of capacitor C48, the first terminal of resistor R32, and the first terminal of resistor R28.

[0186] The second terminal of capacitor C48 is connected to the second terminal of resistor R32 and grounded; the second terminal of resistor R28 is connected to a 3.3V power supply.

[0187] The positive terminal of amplifier U10A is connected to a 3.3V power supply, and the negative terminal of amplifier U10A is grounded.

[0188] The signal output terminal of amplifier U10A is connected to the signal input terminal A of logic U13 and the signal input terminal B of logic U27.

[0189] The power supply terminal VCC of logic U13 is connected to a 3.3V power supply, and the ground terminal GND of logic U13 is grounded.

[0190] The signal output terminal Y of logic U13 is connected to the first terminal of resistor R38, and the second terminal of resistor R38 is connected to the first input terminal of indicator D12.

[0191] Indicator light D12 grounding terminal is grounded;

[0192] The ground terminal GND of logic unit U27 is grounded;

[0193] The signal output terminal Y of logic U27 is connected to the first terminal of resistor R34, and the second terminal of resistor R34 is connected to the second input terminal of indicator D12.

[0194] The signal input terminal A of logic device U27 is connected to the signal output terminal of amplifier U11 and the signal input terminal A of logic device U26;

[0195] The power supply terminal VCC of logic unit U27 is connected to a 3.3V power supply;

[0196] The non-inverting input terminal of amplifier U11 is connected to the first terminal of capacitor C33, the first terminal of resistor R88, and the first terminal of resistor R87.

[0197] The second terminal of capacitor C33 is connected to the second terminal of resistor R88 and grounded; the second terminal of resistor R87 is connected to a 3.3V power supply.

[0198] The inverting input terminal of amplifier U11 is connected to the first terminal of capacitor C32, the first terminal of resistor R86, and the first terminal of resistor R79.

[0199] The second terminal of resistor R86 is connected to the second terminal of capacitor C32 and grounded; the second terminal of resistor R79 is connected to the collector of transistor Q4.

[0200] The positive power supply terminal of amplifier U11 is connected to a 3.3V power supply, and the negative power supply terminal of amplifier U11 is grounded.

[0201] The ground terminal GND of logic unit U26 is grounded;

[0202] The power supply terminal VCC of logic unit U26 is connected to a 3.3V power supply;

[0203] After the branch module is connected to the power supply, it acts as a control switch through the cooperation of amplifier U9A (comparator) and transistors Q4 and Q8. The signal is judged by comparators U9B, U10A and U10B. Different signal indicator lights are displayed by logic units U13 and U27 respectively. Interface ST1 is connected to the corresponding sensor or transmitter. The current overload is judged by comparator U11. This branch protection module can be used as an 8mA current detection module or a 60mA current detection module. It can cut off the branch exceeding 60mA after a short circuit. On the other hand, if the current of the sensor or transmitter device is very large, it only accepts 60mA.

[0204] The logic units U13, U26 and U27 mentioned above are model numbers SN74LVC1G08, SN74LVC1G04 and SN74LVC1G00 respectively, the amplifiers U9A, U9B, U10A and U10B are model numbers AD8542, and the amplifier U11 is model number AD8541.

[0205] like Figure 7 The diagram shown illustrates the specific connection method of the terminating resistor circuit of this utility model:

[0206] The control terminal A of the optocoupler relay U1 is connected to the first terminal of resistor R4, and the second terminal of resistor R4 is connected to a 3.3V power supply.

[0207] The voltage output terminal V1 of the optocoupler relay U1 is connected to the first terminal of resistor R5, the second terminal of resistor R5 is connected to the first terminal of capacitor C3, and the second terminal of capacitor C3 is grounded.

[0208] The voltage input terminal V2 of the optocoupler relay U1 is connected to the power supply FF+;

[0209] The control terminal K of the optocoupler relay U1 is connected to the first terminal of the resistor R16;

[0210] like Figure 8 The diagram shown is a schematic of the main line indicator module circuit of this utility model, with specific connection details:

[0211] The non-inverting input terminal of amplifier U5B is connected to the first terminal of capacitor C9 and the first terminal of resistor R15, and the second terminal of resistor R15 is connected to the first terminal of resistor R11.

[0212] The second terminal of capacitor C9 is grounded;

[0213] The inverting input of amplifier U5B is connected to the first terminal of capacitor C12, the first terminal of resistor R21, and the first terminal of resistor R17. The second terminal of resistor R21 is connected to the second terminal of capacitor C12 and grounded. The second terminal of resistor R17 is connected to a 3.3V power supply.

[0214] The signal output terminal of amplifier U5B is connected to the first terminal of resistor R16, and the second terminal of resistor R16 is connected to the first input terminal of LED indicator D7.

[0215] The second input terminal of LED indicator D7 is connected to the first terminal of resistor R13, the second terminal of resistor R13 is connected to the output terminal OUT of timer U7, and the ground terminal of LED indicator D7 is grounded.

[0216] Termination resistors in fieldbus distributors are primarily used to match transmission line impedance, eliminate signal reflections, and ensure communication stability. In distributors that support automatic termination matching (such as the MCAFD series), the system can automatically activate the termination resistor when no device is connected at the end of the branch line, indirectly protecting the integrity of the bus signal. This function does not directly detect the device location through the termination resistor, but rather triggers the closing operation through port status detection. The distributor's comprehensive protection also includes short-circuit isolation, fault diagnosis, and environmental protection, and the termination resistor is a key component in ensuring signal quality.

[0217] The optocoupler relay U1 mentioned above is model AQY212S, and the amplifier U5B is model AD8542.

[0218] like Figure 9 The diagram shown illustrates the specific connection method of the power supply circuit of this utility model:

[0219] The voltage output terminal OUT of voltage regulator U6 is connected to the first terminal of capacitor C25, the first terminal of capacitor C27, and the 3.3V power supply.

[0220] The second terminal of capacitor C25 is connected to the second terminal of capacitor C27 and grounded;

[0221] The grounding terminal GND of voltage regulator U6 is grounded;

[0222] The voltage input terminal IN of voltage regulator U6 is connected to the enable terminal EN of voltage regulator U6, the first terminal of resistor R12, the first terminal of capacitor C11, the first terminal of capacitor E1, and the first terminal of inductor L7.

[0223] The second terminal of resistor R12 is connected to the first terminal of resistor R18 and the feedback terminal FB of converter U8;

[0224] The second terminal of capacitor E1 is connected to the second terminal of capacitor C11 and the second terminal of resistor R18, and then grounded.

[0225] The second terminal of inductor L7 is connected to the negative terminal of diode D20, the first terminal of capacitor C69, and the switching terminal SW of converter U8;

[0226] The positive terminal of diode D20 is grounded;

[0227] The second terminal of capacitor C69 is connected to the capacitor terminal BST of converter U8;

[0228] The ground terminal GND of converter U8 is grounded;

[0229] The voltage input terminal VIN of converter U8 is connected to the enable terminal EN of converter U8, the first terminal of capacitor C70, the first terminal of capacitor E2, and the first terminal of inductor L8.

[0230] The second terminal of capacitor C70 is connected to the second terminal of capacitor E2 and grounded;

[0231] The second terminal of inductor L8 is connected to the power supply FF+;

[0232] The technical advantages of this utility model are as follows: The active fieldbus distributor is suitable for FOUNDATION H1 and PROFIBUS PA fieldbus applications. The distributor connects field devices to the system in a trunk-branch topology. Each distributor MCAFD4 / MCAFD8 / MCAFD12 has 4 / 8 / 12 branches. It has a built-in automatic bus terminal, and the LED status indicator can quickly diagnose the short circuit status of the main line and branch line, automatically isolate faulty sections, and the distributor's multiple protection functions ensure the safe operation of the system.

[0233] The voltage regulator U6 mentioned above is model S818-3.3, and the converter U8 is model SCT2601.

[0234] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An active fieldbus distributor, characterized in that, include: The main line unit includes: a main line interface protection module, a main line current detection module, and a main line short circuit detection and control module; The trunk interface protection module includes a trunk interface protection input module and a trunk interface protection output module; The output terminal of the main line interface protection input module is connected to the input terminal of the main line current detection module; The detection output terminal of the main line current detection module is connected to the detection input terminal of the main line short circuit detection control module; The power output terminal of the main line current detection module is connected to the power input terminal of the main line short circuit detection control module. The power output terminal of the main line short circuit detection and control module is connected to the power input terminal of the main line interface protection output module.

2. The active fieldbus distributor according to claim 1, characterized in that, The mainline interface protection input module includes: the first end of the Trunkin port J1 is connected to the first end of the gas discharge tube D4 and the first end of the fuse F1; the second end of the fuse F1 is connected to the first end of the transient suppression diode D5, the first end of the capacitor C2 and the first end of the inductor L1; the second end of the capacitor C2 is grounded; the second end of the Trunkin port J1 is connected to the control terminal of the gas discharge tube D4 and grounded; the third end of the Trunkin port J1 is connected to the second end of the gas discharge tube D4, the second end of the transient suppression diode D5, the first end of the capacitor C6 and the second end of the inductor L1; the second end of the capacitor C6 is grounded; the third end of the inductor L1 is connected to the drain of the field-effect transistor Q13; and the fourth end of the inductor L1 is grounded. The main line interface protection output module includes: the first end of inductor L2 is connected to the drain of field-effect transistor Q2; The second terminal of inductor L2 is connected to the first terminal of capacitor C1, the first terminal of transient suppression diode D6, the first terminal of gas discharge tube D3, and the first terminal of TrunkOut port J2. The second terminal of capacitor C1 is grounded. The third terminal of inductor L2 is connected to the first terminal of capacitor C7, the second terminal of transient suppression diode D6, the second terminal of gas discharge tube D3, and the third terminal of TrunkOut port J2. The second terminal of capacitor C7 is grounded. The fourth terminal of inductor L2 is grounded; The second terminal of TrunkOut port J2 is connected to the control terminal of gas discharge tube D3 and grounded.

3. The active fieldbus distributor according to claim 1, characterized in that, The main line current detection module includes: the drain of the field-effect transistor Q13 is connected to the third terminal of the inductor L1, the source of the field-effect transistor Q13 is connected to the negative terminal of the diode D21 and outputs power supply FF+, and the source of the field-effect transistor Q13 is connected to the first terminal of the resistor R1, the first terminal of the resistor R3, the voltage input terminal Vin+ of the detector U4, and the voltage input terminal Vin+ of the detector U2. The second end of resistor R1 is connected to the second end of resistor R3, the voltage input terminal Vin- of detector U4, the voltage input terminal Vin- of detector U2, and the source of field-effect transistor Q2; The ground terminal GND of detector U2 is connected to the first terminal of resistor R10 and grounded; The signal output terminal OUT of detector U2 is connected to the second terminal of resistor R10 and the first terminal of resistor R11; The power supply terminal V+ of detector U2 is connected to a 3.3V power supply, the second terminal of resistor R11, and the first terminal of capacitor C8. The second terminal of capacitor C8 is grounded. The first terminal of resistor R98 is connected to the first terminal of resistor R9, the ground terminal GND of detector U4, and grounded. The second terminal of resistor R98 is connected to the positive terminal of diode D21 and the gate of field-effect transistor Q13; The power supply terminal V+ of detector U4 is connected to a 3.3V power supply; The signal output terminal OUT of detector U4 is connected to the first terminal of resistor R14 and the second terminal of resistor R9. The second terminal of resistor R14 is connected to the inverting input terminal of amplifier U5A.

4. The active fieldbus distributor according to claim 1, characterized in that, The main line short circuit detection and control module includes: the inverting input terminal of amplifier U5A is connected to the second terminal of resistor R14 and the first terminal of capacitor C10, and the second terminal of capacitor C10 is grounded; The non-inverting input terminal of amplifier U5A is connected to the first terminal of resistor R22, the first terminal of capacitor C14, and the first terminal of resistor R19. The second terminal of resistor R22 is connected to the second terminal of capacitor C14 and grounded; the second terminal of resistor R19 is connected to a 3.3V power supply. The negative power supply terminal of amplifier U5A is grounded, and the positive power supply terminal of amplifier U5A is connected to a 3.3V power supply. Timer U7 starts the timing input terminal Connect the signal output terminal of amplifier U5A; The threshold terminal THR of timer U7 is connected to the end timing turn-on terminal DISC of timer U7; Timer U7 control terminal Connect the first terminal of capacitor C5, and ground the second terminal of capacitor C5. Timer U7 Force Reset Terminal Connect to a 3.3V power supply; The ground terminal GND of timer U7 is connected to the first terminal of capacitor C15 and grounded, and the second terminal of capacitor C15 is connected to the 3.3V power supply. The power supply terminal VDD of timer U7 is connected to the first terminal of resistor R20 and the 3.3V power supply. The timer U7's timing end DISC terminal is connected to the second terminal of resistor R20 and the first terminal of capacitor C13, with the second terminal of capacitor C13 grounded. The output terminal OUT of timer U7 is connected to the signal input terminal A of inverter U25; The inverter U25's power supply terminal VCC is connected to a 3.3V power supply; Inverter U25 ground terminal GND is grounded; The signal output terminal Y of inverter U25 is connected to the first terminal of resistor R23, and the second terminal of resistor R23 is connected to the base of transistor Q3. The emitter of transistor Q3 is grounded; The collector of transistor Q3 is connected to the second terminal of resistor R76 and the base of transistor Q12; The first end of resistor R76 is connected to the collector of transistor Q12, the cathode of diode D22, the source of field-effect transistor Q2, and the second end of resistor R3. The emitter of transistor Q12 is connected to the positive terminal of diode D22, the gate of field-effect transistor Q2, and the first terminal of resistor R7; The second terminal of resistor R7 is connected to the first terminal of capacitor C4 and grounded; The second terminal of capacitor C4 is connected to the drain of field-effect transistor Q2 and the first terminal of inductor L2.

5. The active fieldbus distributor according to claim 1, characterized in that, It also includes a trunk line indicator module, which includes: the non-inverting input terminal of amplifier U5B is connected to the first terminal of capacitor C9 and the first terminal of resistor R15, and the second terminal of resistor R15 is connected to the first terminal of resistor R11. The second terminal of capacitor C9 is grounded; The inverting input of amplifier U5B is connected to the first terminal of capacitor C12, the first terminal of resistor R21, and the first terminal of resistor R17. The second terminal of resistor R21 is connected to the second terminal of capacitor C12 and grounded. The second terminal of resistor R17 is connected to a 3.3V power supply. The signal output terminal of amplifier U5B is connected to the first terminal of resistor R16, and the second terminal of resistor R16 is connected to the first input terminal of LED indicator D7. The second input terminal of LED indicator D7 is connected to the first terminal of resistor R13, the second terminal of resistor R13 is connected to the signal output terminal OUT of timer U7, and the ground terminal of LED indicator D7 is grounded. It also includes a terminating resistor module, which includes: the control terminal A of the optocoupler relay U1 is connected to the first terminal of the resistor R4, and the second terminal of the resistor R4 is connected to the 3.3V power supply. The voltage output terminal V1 of the optocoupler relay U1 is connected to the first terminal of resistor R5, the second terminal of resistor R5 is connected to the first terminal of capacitor C3, and the second terminal of capacitor C3 is grounded. The voltage input terminal V2 of the optocoupler relay U1 is connected to the power supply FF+; The control terminal K of the optocoupler relay U1 is connected to the first terminal of the resistor R16.

6. The active fieldbus distributor according to claim 1, characterized in that, The 3.3V power supply is output by the power supply module, which includes: the voltage output terminal OUT of the voltage regulator U6 is connected to the first terminal of capacitor C25, the first terminal of capacitor C27, and the 3.3V power supply; The second terminal of capacitor C25 is connected to the second terminal of capacitor C27 and grounded; the ground terminal GND of voltage regulator U6 is grounded; the voltage input terminal IN of voltage regulator U6 is connected to the enable terminal EN of voltage regulator U6, the first terminal of resistor R12, the first terminal of capacitor C11, the first terminal of capacitor E1, and the first terminal of inductor L7; the second terminal of resistor R12 is connected to the first terminal of resistor R18 and the feedback terminal FB of converter U8; the second terminal of capacitor E1 is connected to the second terminal of capacitor C11 and the second terminal of resistor R18 and grounded; the second terminal of inductor L7... Connect the negative terminal of diode D20, the first terminal of capacitor C69, and the switching terminal SW of converter U8; ground the positive terminal of diode D20; connect the second terminal of capacitor C69 to the capacitor terminal BST of converter U8; ground the ground terminal GND of converter U8; connect the voltage input terminal VIN of converter U8 to the enable terminal EN of converter U8, the first terminal of capacitor C70, the first terminal of capacitor E2, and the first terminal of inductor L8; connect the second terminal of capacitor C70 to the second terminal of capacitor E2 and ground; connect the second terminal of inductor L8 to the power supply FF+.

7. The active fieldbus distributor according to claim 1, characterized in that, It also includes branch units, The branch unit includes: a branch interface protection module, a branch overcurrent detection and control module, a branch short circuit detection and control module, and a branch indicator module; The output terminal of the branch interface protection module is connected to the input terminal of the branch overcurrent detection control module and the input terminal of the branch short circuit detection control module, respectively. The control terminal of the branch short circuit detection control module is connected to the control terminal of the branch overcurrent detection control module; The output terminal of the branch overcurrent detection control module is connected to the first detection input terminal of the branch indicator module; The output of the branch short-circuit detection and control module is connected to the second detection input of the branch indicator module.

8. The active fieldbus distributor according to claim 7, characterized in that, The branch interface protection module includes: the first end of the power port J3 is connected to the first end of the capacitor C38 and the first end of the inductor L3, and the second end of the capacitor C38 is grounded. The second terminal of power port J3 is grounded; The third terminal of power port J3 is connected to the first terminal of capacitor C45 and the second terminal of inductor L3, and the second terminal of capacitor C45 is grounded. The third terminal of inductor L3 is connected to the negative terminal of diode D8 and the power supply FF+, and the positive terminal of diode D8 is grounded. The fourth terminal of inductor L3 is connected to the negative terminal of diode D10, the collector of transistor Q4, and the second terminal of resistor R79. The positive terminal of diode D10 is grounded.

9. The active fieldbus distributor according to claim 7, characterized in that, The branch overcurrent detection and control module includes: the collector of transistor Q4 is connected to the fourth terminal of inductor L3; The base of transistor Q4 is connected to the collector of transistor Q8 and the first terminal of resistor R26; The non-inverting input terminal of amplifier U9A is connected to the first terminal of resistor R24, the first terminal of resistor R30, and the first terminal of capacitor C46. The second terminal of resistor R24 ​​is connected to a 3.3V power supply. The positive terminal of the power supply of amplifier U9A is connected to the first terminal of capacitor C42 and the 3.3V power supply, and the second terminal of capacitor C42 is grounded. The second terminal of resistor R30 is connected to the second terminal of capacitor C46 and grounded; The inverting input terminal of amplifier U9A is connected to the emitter of transistor Q4, the first terminal of resistor R40, and the first terminal of resistor R36; The negative power supply terminal of amplifier U9A is grounded; The signal output terminal of amplifier U9A is connected to the second terminal of resistor R26; The second terminal of resistor R40 is grounded.

10. The active fieldbus distributor according to claim 7, characterized in that, The branch line indicator module includes: the first end of resistor R36 is connected to the emitter of transistor Q4; The second end of resistor R36 is connected to the first end of capacitor C50 and the non-inverting input of amplifier U9B, and the second end of capacitor C50 is grounded. The inverting input terminal of amplifier U9B is connected to the first terminal of resistor R42 and the first terminal of resistor R43, and the second terminal of resistor R42 is grounded. The second end of resistor R43 is connected to the signal output terminal of amplifier U9B, the non-inverting input terminal of amplifier U10B, and the inverting input terminal of amplifier U10A; The inverting input terminal of amplifier U10B is connected to the first terminal of capacitor C52, the first terminal of resistor R47, and the first terminal of resistor R46. The second terminal of capacitor C52 is connected to the second terminal of resistor R47 and grounded; the second terminal of resistor R46 is connected to a 3.3V power supply. The signal output terminal of amplifier U10B is connected to the signal input terminal B of logic U13; The non-inverting input terminal of amplifier U10A is connected to the first terminal of capacitor C48, the first terminal of resistor R32, and the first terminal of resistor R28. The second terminal of capacitor C48 is connected to the second terminal of resistor R32 and grounded; the second terminal of resistor R28 is connected to a 3.3V power supply. The positive terminal of amplifier U10A is connected to a 3.3V power supply, and the negative terminal of amplifier U10A is grounded. The signal output terminal of amplifier U10A is connected to the signal input terminal A of logic U13 and the signal input terminal B of logic U27. The power supply terminal VCC of logic U13 is connected to a 3.3V power supply, and the ground terminal GND of logic U13 is grounded. The signal output terminal Y of logic U13 is connected to the first terminal of resistor R38, and the second terminal of resistor R38 is connected to the first input terminal of indicator D12. Indicator light D12 grounding terminal is grounded; The ground terminal GND of logic unit U27 is grounded; The signal output terminal Y of logic U27 is connected to the first terminal of resistor R34, and the second terminal of resistor R34 is connected to the second input terminal of indicator D12. The signal input terminal A of logic unit U27 is connected to the signal output terminal of amplifier U11; The power supply terminal VCC of logic unit U27 is connected to a 3.3V power supply; The branch short-circuit detection and control module includes: the second terminal of resistor R79 is connected to the fourth terminal of inductor L3; The collector of transistor Q8 is connected to the base of transistor Q4; The base of transistor Q8 is connected to the first terminal of resistor R78 and the first terminal of capacitor C65. The second terminal of capacitor C65 is connected to the emitter of transistor Q8 and grounded. The second terminal of resistor R78 is connected to the signal output terminal Y of logic U26. The non-inverting input terminal of amplifier U11 is connected to the first terminal of capacitor C33, the first terminal of resistor R88, and the first terminal of resistor R87. The second terminal of capacitor C33 is connected to the second terminal of resistor R88 and grounded; the second terminal of resistor R87 is connected to a 3.3V power supply. The inverting input terminal of amplifier U11 is connected to the first terminal of capacitor C32, the first terminal of resistor R86, and the first terminal of resistor R79. The second terminal of resistor R86 is connected to the second terminal of capacitor C32 and grounded; The positive power supply terminal of amplifier U11 is connected to a 3.3V power supply, and the negative power supply terminal of amplifier U11 is grounded. The ground terminal GND of logic unit U26 is grounded; The power supply terminal VCC of logic unit U26 is connected to a 3.3V power supply; The signal output terminal of amplifier U11 is connected to the signal input terminal A of logic U27 and the signal input terminal A of logic U26.

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