High-power field bus two-wire power supply and communication integrated transceiver control circuit

Abstract

The utility model relates to fire alarm technical field, concretely is a kind of high-power fieldbus two-wire system power supply and communication integration transceiver control circuit, it can realize the bus mode of two-wire system connection between control host computer and sensor, controlled equipment, reduce installation wiring cost, support more high-power equipment and node, enhance anti-electromagnetic interference performance, applicable to industrial field engineering environment, it includes power module, sending module, receiving module and control module, external equipment is connected in parallel on two-wire system bus through bus interface;The power module is converted into three-way power output by voltage stabilizing chip with external power input, respectively for the power supply of sending module, receiving module and control module.

Description

Technical Field

[0001] This utility model relates to the field of fire alarm technology, specifically a high-power fieldbus two-wire integrated power supply and communication transceiver control circuit. Background Technology

[0002] In the fields of automatic fire alarm and industrial automation, fieldbus technology is widely used for data transmission and control between control hosts and various detectors, sensors, and controlled devices. However, existing fieldbus systems (such as RS-485, CAN, etc.) have many shortcomings in their transceiver control circuits: 1. In terms of connection method, most adopt multi-wire connection method, which makes equipment installation and wiring construction complicated, increasing not only labor costs, but also material costs.

[0003] 2. Functionally, power supply and communication are separated, and most adopt a four-wire system (power line + communication line), which results in high wiring costs and limited node expansion.

[0004] 3. In terms of power supply capacity, its power supply is limited, which makes it difficult to meet the needs of high-power sensors and controlled equipment, resulting in a significant limitation on the number of connection nodes and making it unable to meet the requirements of multi-device collaborative work in industrial sites.

[0005] 4. In terms of communication reliability, the existing communication methods are relatively simple and are subject to strong electromagnetic interference in industrial engineering environments, which can easily lead to data transmission errors and seriously affect the reliability and stability of the system.

[0006] Therefore, there is an urgent need for a fieldbus transceiver control circuit that can solve the above problems. Summary of the Invention

[0007] To address the aforementioned technical issues, this utility model provides a high-power fieldbus two-wire integrated power supply and communication transceiver control circuit. It enables two-wire connections between the control host and sensors / controlled devices, reducing installation and wiring costs, supporting more high-power devices and nodes, enhancing electromagnetic interference resistance, and making it suitable for industrial engineering environments.

[0008] The technical solution is as follows: A high-power fieldbus two-wire integrated power supply and communication transceiver control circuit, characterized in that it includes a power supply module, a transmitting module, a receiving module, and a control module. External devices are connected in parallel on the two-wire bus through a bus interface. The power supply module converts the external power input into three power outputs through a voltage regulator chip, which power the transmitting module, the receiving module, and the control module respectively. The control module includes a microcontroller U4. Pins 14 and 13 of the microcontroller U4 control the TX+ and TX- outputs to control the transmitting module. Pins 14, 13, and 1 of the microcontroller U4 work together to switch the bus to the receiving state. Pin 12 of the microcontroller U4 detects the width of the high and low level signals.

[0009] A further feature is that the power supply module includes voltage regulator chips U1, U2, and U3. Pin 4 of voltage regulator chip U1 is connected to one end of inductor L1, one end of capacitor C1, and one end of capacitor E1, and inputs an external power supply VIN. The other end of inductor L1 is connected to the anode of diode D1 and pin 3 of voltage regulator chip U1. The cathode of diode D1 is connected to one end of resistor R1, one end of capacitor E2, and one end of capacitor C2, and outputs Vbus, which powers the transmitting module. The other end of resistor R1 is connected to one end of resistor R3 and pin 5 of voltage regulator chip U1. The other end of resistor R3 is connected to one end of resistor R7. Pin 2 of voltage regulator chip U1 is connected to VM through resistor R6. Pin 3 of voltage regulator chip U2 is connected to one end of capacitor C5 and inputs an external power supply VIN. Pin 1 of voltage regulator chip U2 is connected to one end of resistor R13, one end of resistor R11, and transistor Q4. At a certain point, the base of transistor Q4 is connected to one end of resistor R15, and the other end of resistor R15 is connected to pin 1 of microcontroller U4. Pins 2 and 4 of voltage regulator chip U2 are connected to output Vback, which supplies power to the receiving module, and are connected to one end of capacitor C3 and the other end of resistor R11. The other ends of capacitor C5, resistor R13, capacitor C3, and the emitter of transistor Q4 are all grounded. Pin 3 of voltage regulator chip U3 is connected to one end of capacitor C6 and inputs external power supply VIN. Pin 1 of voltage regulator chip U3 is connected to one end of resistor R14 and one end of resistor R12. Pins 2 and 4 of voltage regulator chip U2 are connected to output VCC, which supplies power to the control module, and are connected to one end of capacitor C7 and the other end of resistor R12. The other ends of capacitor C6, capacitor C7, and resistor R14 are all grounded. The transmitting module includes transistors Q2 and Q6. The base of transistor Q2 is connected to pin 14 of the microcontroller U4 via resistor R4. The collector of transistor Q2 is connected to one end of resistor R2, the base of transistor Q1, and the base of transistor Q6. The emitter of transistor Q1 is connected to the emitter of transistor Q3 and is connected to one end of resistor R5 and the anode of diode D2. The other end of resistor R5 is connected to the cathode of diode D2. The gate terminal of MOSFET M1, the other end of resistor R2, the collector of transistor Q1, and the drain terminal of MOSFET M1 are all connected to Vbus. The other end of resistor R8 and the collector of transistor Q3 are both grounded. The source terminal of MOSFET M1 is connected to one end of resistor R9. The base of transistor Q6 is connected to pin 13 of microcontroller U4 through resistor R18. The collector of transistor Q6 is connected to one end of resistor R16, the base of transistor Q5, and the drain terminal of transistor Q6. The base of transistor 7 is connected to the emitter of transistor Q5 and the emitter of transistor Q7, and connected to one end of resistor R19 and the anode of diode D5. The other end of resistor R19 is connected to the cathode of diode D5 and connected to the gate of MOSFET M2. The other end of resistor R16 and the collector of transistor Q5 are both connected to Vbus. The other end of resistor R22, the collector of transistor Q7, and the source of MOSFET M2 are all grounded. The drain of MOSFET M2 is connected to one end of resistor R17. The other end of resistor R9 and the other end of resistor R17 are connected to the cathodes of diode D3 and D4, one end of capacitor C4, and one end of fuse F1. The source of MOSFET M2 is also connected to one end of resistor R23. The other end of resistor R23 and the other end of fuse F1 are connected to one end of common mode inductor LL1. The other end of common mode inductor LL1 is connected to the two-wire bus BUS+ and BUS-. The receiving module includes a voltage comparator U5A. The non-inverting input of the voltage comparator U5A is connected to one end of resistor R25 and one end of capacitor C9. The other end of resistor R25 is connected to one end of resistor R10 and the transmitting module. The inverting input of the voltage comparator U5A is connected to one end of resistor R20 and one end of resistor R24. The other ends of resistor R20 and resistor R10 are both connected to Vback. The output of the voltage comparator U5A is connected to one end of resistor R21, the cathode of diode D6, and pin 12 of the microcontroller U4.

[0010] By adopting this utility model, a two-wire bus system is used, with all sub-devices connected in parallel on the bus, which greatly simplifies the installation and wiring process, significantly reduces labor and material costs, provides high-power power supply capability, supports more high-power devices and nodes, enhances electromagnetic interference resistance, and is suitable for industrial engineering environments. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the system of this utility model; Figure 2 This is the circuit schematic for the control module; Figure 3 This is the circuit schematic of the power supply module; Figure 4 This is the schematic diagram of the transmitting module circuit. Figure 5 This is the circuit schematic of the receiving module. Detailed Implementation

[0012] See Figure 1 and Figure 2 As shown, a high-power fieldbus two-wire integrated power supply and communication transceiver control circuit includes a power supply module, a transmitting module, a receiving module, and a control module. External devices are connected in parallel on the two-wire bus through a bus interface. The power supply module converts the external power input into three power outputs through a voltage regulator chip, which power the transmitting module, the receiving module, and the control module respectively. The control module includes a microcontroller U4, model EM78P153. Pins 14 and 13 of the microcontroller U4 control the TX+ and TX- outputs to control the transmission module. The transmitting module sends high and low level signals of different widths to transmit "1" and "0" signals (the width can be customized). Pins 14, 13, and 1 of the microcontroller U4 work together to switch the bus to the receiving state. Pin 12 of the microcontroller U4 detects the width of the high and low level signals to identify "1" and "0" (the width can be customized).

[0013] See Figure 3As shown, the power supply module mainly provides power to the entire circuit. It receives the external power input VIN and converts it into three power outputs: VCC, Vbus, and Vback (where Vbus output can reach over 5A, ensuring high-power bus output), which power the control module, transmitting module, and receiving module respectively. The power supply module includes voltage regulator chips U1, U2, and U3. Pin 4 of voltage regulator chip U1 is connected to one end of inductor L1, one end of capacitor C1, and one end of capacitor E1, and is the input of the external power supply VIN. The other end of inductor L1 is connected to the anode of diode D1 and pin 3 of voltage regulator chip U1. The cathode of diode D1 is connected to one end of resistor R1, one end of capacitor E2, and one end of capacitor C2, and is the output Vbus powering the transmitting module. The other end of resistor R1 is connected to one end of resistor R3 and pin 5 of voltage regulator chip U1. The other end of resistor R3 is connected to one end of resistor R7. Pin 2 of voltage regulator chip U1 is connected to VM through resistor R6. Pin 3 of voltage regulator chip U2 is connected to one end of capacitor C5 and inputs external power supply VIN. Pin 1 of voltage regulator chip U2 is connected to one end of resistor R13, one end of resistor R11, and the pin of transistor Q4. The base of transistor Q4 is connected to one end of resistor R15. The other end of resistor R15 is connected to pin 1 of microcontroller U4. Pins 2 and 4 of voltage regulator chip U2 are connected to output Vback, which supplies power to the receiver module, and is connected to one end of capacitor C3 and the other end of resistor R11. The other end of capacitor C5 and resistor R11 are connected to... The other end of capacitor C3, the other end of capacitor C3, and the emitter of transistor Q4 are all grounded; pin 3 of voltage regulator chip U3 is connected to one end of capacitor C6 and inputs external power supply VIN; pin 1 of voltage regulator chip U3 is connected to one end of resistor R14 and one end of resistor R12; pins 2 and 4 of voltage regulator chip U2 are connected to output VCC to power the control module and are connected to one end of capacitor C7 and the other end of resistor R12; the other ends of capacitor C6, capacitor C7, and resistor R14 are all grounded.

[0014] See Figure 4As shown, the transmitting module includes transistors Q2 and Q6. The base of transistor Q2 is connected to pin 14 of microcontroller U4 via resistor R4. The collector of transistor Q2 is connected to one end of resistor R2, the base of transistor Q1, and the base of transistor Q1. The emitter of transistor Q1 is connected to the emitter of transistor Q3 and is connected to one end of resistor R5 and the anode of diode D2. The other end of resistor R5 is connected to the cathode of diode D2 and to the gate of MOSFET M1. The other end of resistor R2... The collector of transistor Q1 and the drain of MOSFET M1 are both connected to Vbus. The other end of resistor R8 and the collector of transistor Q3 are both grounded. The source of MOSFET M1 is connected to one end of resistor R9. The base of transistor Q6 is connected to pin 13 of microcontroller U4 through resistor R18. The collector of transistor Q6 is connected to one end of resistor R16, the base of transistor Q5, and the base of transistor Q7. The emitters of transistors Q5 and Q7 are connected together and connected to one end of resistor R19. The anode of diode D5 is connected to the cathode of diode D5 via the other end of resistor R19, which is then connected to the gate of MOSFET M2. The other end of resistor R16 and the collector of transistor Q5 are both connected to Vbus. The other end of resistor R22, the collector of transistor Q7, and the source of MOSFET M2 are all grounded. The drain of MOSFET M2 is connected to one end of resistor R17. The other end of resistor R9 and the other end of resistor R17 are connected to the cathodes of diodes D3 and D4, one end of capacitor C4, and one end of fuse F1. The source of MOSFET M2 is also connected to one end of resistor R23. The other end of resistor R23 and the other end of fuse F1 are connected to one end of common-mode inductor LL1. The other end of common-mode inductor LL1 is connected to the two-wire bus BUS+ and BUS-. A half-bridge output structure using MOSFETs has very low internal resistance and virtually no voltage loss under high load current (high power) output. The MOSFETs are driven by a push-pull circuit composed of two transistors, which has good fast response performance. The control module's TX+, TX-, and Rx_EN signals enable high-level, low-level, and high-impedance outputs. The duration of the high and low levels (i.e., the voltage pulse width) represents "1" and "0" respectively (this can be customized). The high-impedance state is used for data reception, thus enabling power supply to external devices and half-duplex communication. Capacitors, TVS diodes, common-mode inductors, and resettable fuses are incorporated into the output ports to enhance circuit reliability and overload protection.

[0015] See Figure 5As shown, the receiving module includes a voltage comparator U5A. The non-inverting input of voltage comparator U5A is connected to one end of resistor R25 and one end of capacitor C9. The other end of resistor R25 is connected to one end of resistor R10 and the transmitting module. The inverting input of voltage comparator U5A is connected to one end of resistor R20 and one end of resistor R24. The other ends of resistors R20 and R10 are both connected to Vback. The output of voltage comparator U5A is connected to one end of resistor R21, the cathode of diode D6, and pin 12 of microcontroller U4. The bus is first set to a high-impedance state. The feedback signal from the external device is obtained by detecting the current, and "1" and "0" are identified based on the duration of the current (i.e., the current pulse width) (which can be customized). Setting the current sampling resistor (R10) at the non-inverting input of voltage comparator U5A (traditionally, the current detection sampling resistor is set at the inverting input) effectively solves the loss problem caused by the sampling resistor under high load current (high power). The circuit principle is that after the current sampling resistor R10 collects the signal, the voltage comparator U5A filters out the valid signal and inputs it to the RX of the control module for current pulse width identification, thereby receiving a "1" or "0" signal.

[0016] This invention employs a two-wire bus system, with all sub-devices connected in parallel on the bus, greatly simplifying the installation and wiring process and significantly reducing labor and material costs. The power supply module uses MOSFETs to form a half-bridge output, leveraging the high switching speed and low internal resistance of MOSFETs to achieve high-power output, supporting higher-power sensors and controlled devices. It also maximizes the number of connection nodes, meeting the needs of multi-device collaborative operation in industrial settings. The communication module uses a hybrid communication method combining level, pulse width, and current communication. This combination gives the circuit strong electromagnetic interference resistance, ensuring the reliability and stability of data transmission in complex industrial environments.

Claims

1. A high-power fieldbus two-wire integrated power supply and communication transceiver control circuit, characterized in that, It includes a power supply module, a transmitting module, a receiving module, and a control module. External devices are connected in parallel on a two-wire bus via a bus interface. The power supply module converts the external power input into three power outputs through a voltage regulator chip, which power the transmitting module, the receiving module, and the control module respectively.

2. The high-power fieldbus two-wire integrated power supply and communication transceiver control circuit according to claim 1, characterized in that, The power supply module includes voltage regulator chips U1, U2, and U3. Pin 4 of voltage regulator chip U1 is connected to one end of inductor L1, one end of capacitor C1, and one end of capacitor E1, and is used as an input to external power supply VIN. The other end of inductor L1 is connected to the anode of diode D1 and pin 3 of voltage regulator chip U1. The cathode of diode D1 is connected to one end of resistor R1, one end of capacitor E2, and one end of capacitor C2, and outputs Vbus, which powers the transmitting module. The other end of resistor R1 is connected to one end of resistor R3 and pin 5 of voltage regulator chip U1. The other end of resistor R3 is connected to one end of resistor R7. Pin 2 of voltage regulator chip U1 is connected to VM through resistor R6. Pin 3 of voltage regulator chip U2 is connected to one end of capacitor C5 and is used as an input to external power supply VIN. Pin 1 of voltage regulator chip U2 is connected to one end of resistor R13, one end of resistor R11, and transistor Q4. At a certain point, the base of transistor Q4 is connected to one end of resistor R15, and the other end of resistor R15 is connected to pin 1 of microcontroller U4. Pins 2 and 4 of voltage regulator chip U2 are connected to output Vback, which supplies power to the receiving module, and are connected to one end of capacitor C3 and the other end of resistor R11. The other ends of capacitor C5, resistor R13, capacitor C3, and the emitter of transistor Q4 are all grounded. Pin 3 of voltage regulator chip U3 is connected to one end of capacitor C6 and inputs external power supply VIN. Pin 1 of voltage regulator chip U3 is connected to one end of resistor R14 and one end of resistor R12. Pins 2 and 4 of voltage regulator chip U2 are connected to output VCC, which supplies power to the control module, and are connected to one end of capacitor C7 and the other end of resistor R12. The other ends of capacitor C6, capacitor C7, and resistor R14 are all grounded.

3. The high-power fieldbus two-wire integrated power supply and communication transceiver control circuit according to claim 2, characterized in that, The transmitting module includes transistors Q2 and Q6. The base of transistor Q2 is connected to pin 14 of the microcontroller U4 via resistor R4. The collector of transistor Q2 is connected to one end of resistor R2, the base of transistor Q1, and the base of transistor Q6. The emitter of transistor Q1 is connected to the emitter of transistor Q3 and is connected to one end of resistor R5 and the anode of diode D2. The other end of resistor R5 is connected to the cathode of diode D2. The gate terminal of MOSFET M1, the other end of resistor R2, the collector of transistor Q1, and the drain terminal of MOSFET M1 are all connected to Vbus. The other end of resistor R8 and the collector of transistor Q3 are both grounded. The source terminal of MOSFET M1 is connected to one end of resistor R9. The base of transistor Q6 is connected to pin 13 of microcontroller U4 through resistor R18. The collector of transistor Q6 is connected to one end of resistor R16, the base of transistor Q5, and the drain terminal of transistor Q6. The base of transistor 7 is connected to the emitter of transistor Q5 and the emitter of transistor Q7, and is connected to one end of resistor R19 and the anode of diode D5. The other end of resistor R19 is connected to the cathode of diode D5 and is connected to the gate of MOSFET M2. The other end of resistor R16 and the collector of transistor Q5 are both connected to Vbus. The other end of resistor R22, the collector of transistor Q7, and the source of MOSFET M2 are all grounded. The drain of MOSFET M2 is connected to one end of resistor R17. The other end of resistor R9 and the other end of resistor R17 are connected to the cathodes of diodes D3 and D4, one end of capacitor C4, and one end of fuse F1. The source of MOSFET M2 is also connected to one end of resistor R23. The other end of resistor R23 and the other end of fuse F1 are connected to one end of common mode inductor LL1. The other end of common mode inductor LL1 is connected to the two-wire bus BUS+ and BUS-.

4. The high-power fieldbus two-wire integrated power supply and communication transceiver control circuit according to claim 3, characterized in that, The receiving module includes a voltage comparator U5A. The non-inverting input of the voltage comparator U5A is connected to one end of resistor R25 and one end of capacitor C9. The other end of resistor R25 is connected to one end of resistor R10 and the transmitting module. The inverting input of the voltage comparator U5A is connected to one end of resistor R20 and one end of resistor R24. The other ends of resistor R20 and resistor R10 are both connected to Vback. The output of the voltage comparator U5A is connected to one end of resistor R21, the cathode of diode D6, and pin 12 of the microcontroller U4.

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