Direct-current 48V two-wire power line carrier system

Abstract

The utility model belongs to the technical field of circuits, and particularly relates to a direct-current 48V two-wire power line carrier system. The MCU is respectively connected with the MCU power supply circuit, the address dial-up circuit, the communication interface circuit and the direct current-to-alternating current driving circuit, the MCU power supply circuit is also connected with the 12V power supply circuit, the 12V power supply circuit is also connected with the 0-10V adjusting circuit, and the communication interface circuit is connected with the 0-10V adjusting circuit. The utility model is used for solving the problem of stroboflash when the voltage is 0V-48V, and can realize the wide voltage range output from-48V to 48V, so as to meet the test and power supply requirements of electronic equipment with various different working voltage requirements, and provide a more comprehensive voltage simulation environment for the research and development, production and quality detection of the electronic equipment.

Description

TECHNICAL FIELD

[0001] The utility model belongs to circuit technical field, more particularly to a direct current 48V two line power carrier system. BACKGROUND

[0002] Traditional constant current load usually only works in the positive voltage range of 0V to 48V, and cannot meet the demand of negative voltage and wider voltage range in some special application scenarios.

[0003] When the wide voltage range changes, especially in the case of positive and negative voltage conversion, the existing constant current load is difficult to maintain high-precision constant current output. When the voltage switches from positive voltage to negative voltage or fluctuates in a large voltage range, due to the change of the characteristics of the components in the circuit, the power supply ripple and other factors, the stability of the output current will decrease, which cannot meet the application demand of high-precision constant current, such as high-precision electronic measuring instruments, some specific industrial automation control systems, etc.

[0004] In order to realize the constant current output of wide voltage range, some existing solutions adopt a relatively complex circuit structure, which increases the cost, volume and power consumption. It may need multiple different types of power modules, complex voltage conversion circuits and current regulation circuits, etc., which not only increases the difficulty of design and manufacture of the device, but also reduces the reliability and maintainability of the system. SUMMARY

[0005] The utility model provides a direct current 48V two line power carrier system to solve the problem of flicker when the voltage is 0V-48V, which can realize the output of wide voltage range from-48V to 48V to meet the test and power supply demand of electronic equipment with different working voltage requirements, and provide a more comprehensive voltage simulation environment for the research and development, production and quality detection of electronic equipment.

[0006] The utility model realizes the following technical schemes:

[0007] A direct current 48V two line power carrier system, the system includes 12V power supply circuit, MCU power supply circuit, MCU, address dialing circuit, communication interface circuit and direct current conversion alternating current drive circuit;

[0008] The MCU is connected with the MCU power supply circuit, the address dialing circuit, the communication interface circuit and the direct current conversion alternating current drive circuit respectively, the MCU power supply circuit is also connected with the 12V power supply circuit, and the 12V power supply circuit is also connected with the 0-10V adjusting circuit, and the communication interface circuit is connected with the 0-10V adjusting circuit.

[0009] Further, the direct current conversion alternating current driving circuit comprises a chip U6 and a chip U7, the No.1 terminal of the chip U6 is connected with an input 15V terminal, one end of a capacitor C10 and a positive electrode of a diode D4 respectively, the other end of the capacitor C10 is connected with the No.4 terminal of the chip U6 and then grounded, the negative electrode of the diode D4 is connected with the No.8 terminal of the chip U6 and one end of a capacitor CE3 respectively, the other end of the capacitor CE3 is connected with the No.6 terminal of the chip U6, the No.3 terminal of a triode Q3, the S terminal of a triode Q2, the D terminal of a triode Q7, the LED A- terminal and one end of a diode group respectively, the No.1 terminal of the triode Q3 is connected with the No.7 terminal of the chip U6 and one end of a resistor R15 respectively, the other end of the resistor R15 is connected with the No.2 terminal of the triode Q3 and the G terminal of the triode Q2 respectively, the D terminal of the triode Q2 is connected with a VIN terminal, the No.5 terminal of the chip U6 is connected with one end of a resistor R20 and the No.1 terminal of a triode Q8 respectively, the other end of the resistor R20 is connected with the No.2 terminal of the triode Q8 and the G terminal of the triode Q7 respectively, the No.3 terminal of the triode Q8 is connected with a CS terminal and the S terminal of the triode Q7 respectively.

[0010] The No.1 terminal of the chip U7 is connected with an input 15V terminal, one end of a capacitor C12 and a positive electrode of a diode D5 respectively, the other end of the capacitor C12 is connected with the No.4 terminal of the chip U7 and then grounded, the negative electrode of the diode D5 is connected with the No.8 terminal of the chip U7 and one end of a capacitor CE4 respectively, the other end of the capacitor CE4 is connected with the No.6 terminal of the chip U7, the No.3 terminal of a triode Q10, the S terminal of a triode Q9, the D terminal of a triode Q11, the LED B- terminal and the other end of a diode group respectively, the No.1 terminal of the triode Q10 is connected with the No.7 terminal of the chip U7 and one end of a resistor R15 respectively, the other end of the resistor R15 is connected with the No.2 terminal of the triode Q10 and the G terminal of the triode Q9 respectively, the D terminal of the triode Q9 is connected with a VIN terminal, the No.5 terminal of the chip U7 is connected with one end of a resistor R20 and the No.1 terminal of a triode Q12 respectively, the other end of the resistor R20 is connected with the No.2 terminal of the triode Q12 and the G terminal of the triode Q11 respectively, the No.3 terminal of the triode Q12 is connected with a CS terminal, one end of a resistor R30, one end of a resistor R31 and the S terminal of the triode Q11 respectively; the other end of the resistor R30 is connected with the other end of the resistor R31 and then grounded.

[0011] Further, a HIN terminal is connected with the No.3 terminal of a triode Q1, the No.2 terminal of the triode Q1 is grounded, and the No.1 terminal of the triode Q1 is connected with one end of a resistor R14.

[0012] LIN end is connected with the 3rd end of the transistor Q5, the 2nd end of the transistor Q5 is grounded, and the 1st end of the transistor Q5 is connected with one end of the resistor R18;

[0013] The other end of the resistor R14 is connected with the other end of the resistor R18, the 3rd end of the transistor Q4 and one end of the resistor R19 respectively, the 2nd end of the transistor Q4 is connected with one end of the resistor R16 and the 3V3 end respectively, the 1st end of the transistor Q4 is connected with one end of the resistor R17 respectively, the other end of the resistor R17 is connected with the SP end and the other end of the resistor R16 and the 3rd end of the transistor Q6 respectively, the other end of the resistor R19 is connected with one end of the resistor R21, one end of the capacitor C11, one end of the resistor R23, the 1st end of the transistor Q6 and the unlock end respectively, and the other end of the resistor R23 is connected with the other end of the capacitor C11 and the 2nd end of the transistor Q6 respectively and grounded.

[0014] The LIN end is connected with the D end of the transistor Q13 and one end of the resistor R25 respectively, the other end of the resistor R25 is connected with the voltage 5V end, the G end of the transistor Q13 is connected with one end of the resistor R27, the other end of the resistor R27 is connected with the UART_TX end and one end of the resistor R29 respectively, the other end of the resistor R27 is connected with the HIN end, and the S end of the transistor Q13 is grounded.

[0015] Further, the MCU is a chip U3, the unlock end of the direct current conversion alternating current driving circuit is connected with the 11th end of the chip U3, the UART_TX end of the direct current conversion alternating current driving circuit is connected with the 2nd end of the chip U3, and the SP end of the direct current conversion alternating current driving circuit is connected with the 14th end of the chip U3.

[0016] Further, the MCU power supply circuit comprises a chip U2, one end of the resistor R7 and one end of the capacitor C2 are connected with the 3rd end of the chip U2 respectively, the other end of the resistor R7 is connected with the voltage 12V, one end of the capacitor C3 and the 2nd end of the chip U2 are connected with the other end of the capacitor C2 and grounded, and the other end of the capacitor C3 is connected with the 1st end of the chip U2 and the voltage 5V respectively.

[0017] The 3rd end of the chip U2 is connected with the 1st end of the chip U5, the 2nd end of the chip U2 is connected with the 1st end of the chip U5, and the 20th end of the chip U2 is connected with the 2nd end and the 3rd end of the chip U5.

[0018] Further, the 12V power supply circuit includes a VIN end, the VIN end is connected with the 48V, one end of the capacitor C33, one end of the capacitor C34, one end of the capacitor C35 and the positive electrode of the diode D1 respectively, the negative electrode of the diode D1 is connected with one end of the resistor R6, the other end of the resistor R6 is connected with one end of the capacitor CE1 and one end of the inductor L2 respectively, the other end of the inductor L2 is connected with one end of the resistor R1, one end of the capacitor CE1 and the 2nd end of the chip U1 respectively, the other end of the resistor R1 is connected with one end of the capacitor C1 and the VDD end of the chip U1 respectively, the other end of the capacitor C33 is connected with the other end of the capacitor C34, the other end of the capacitor C35, the other end of the capacitor CE1 and the other end of the capacitor CE2 respectively and then grounded;

[0019] The other end of the capacitor C1 is grounded, the CS end of the chip U1 is connected with one end of the resistor R2, the other end of the resistor R2 is connected with the 4th end of the chip U1, the negative electrode of the diode D2 and one end of the inductor L3 respectively, the positive electrode of the diode D2 is grounded, the other end of the inductor L3 is connected with one end of the resistor R3, one end of the inductor C4, one end of the inductor C5, one end of the resistor R5 and the 12V end respectively,

[0020] The other end of the resistor R3 is connected with one end of the resistor R4 and the VFB end respectively, the other end of the resistor R4 is grounded.

[0021] The other end of the inductor C4 is connected with the other end of the inductor C4 and the other end of the resistor R5 respectively and then grounded.

[0022] Further, the address dialing circuit includes a dialer SW1, the 4th, 5th and 6th ends of the dialer SW1 are connected with the 5V end, the 1st end of the dialer SW1 is connected with the 17th end of the chip U3 through the ADD1 end, the 2nd end of the dialer SW1 is connected with the 16th end of the chip U3 through the ADD2 end, the 31st end of the dialer SW1 is connected with the 15th end of the chip U3 through the ADD3 end, the 1st end of the dialer SW1 is connected with one end of the resistor R11, the 2nd end of the dialer SW1 is connected with one end of the resistor R12, the 3rd end of the dialer SW1 is connected with one end of the resistor R13, the other end of the resistor R11 is connected with the other end of the resistor R12 and the other end of the resistor R13 respectively and then grounded.

[0023] Further, the communication interface circuit comprises a chip 5, one end of a resistor R9 and a 5V voltage terminal are connected to the 8th terminal of the chip 5, the other end of the resistor R9 and the 1st terminal of an interface J1 are connected to the 7th terminal of the chip 5, one end of a resistor R10 and the 2nd terminal of the interface J1 are connected to the 6th terminal of the chip 5, and the 5th terminal of the chip 5 is connected to the other end of the resistor R10 and then grounded.

[0024] The utility model has the advantages of:

[0025] The utility model ensures that the constant current load can keep high-precision constant current output in a wide voltage range of -48V to 48V, controls the fluctuation range of output current in a very small range, meets the application occasions with harsh constant current precision requirements, and improves the performance and stability of electronic equipment and the accuracy of the test.

[0026] The utility model simplifies the circuit structure of the constant current load, reduces the cost, the volume and the power consumption, improves the reliability and the maintainability of the system, and is more easily integrated into various electronic equipment and test systems.

[0027] The 48V load of the two-wire transmission of the utility model is loaded with a serial signal, and the output becomes an alternating square wave signal, while the traditional one is a discontinuous direct current signal. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the utility model.

[0029] Figure 2 It is a direct current conversion alternating current driving circuit schematic diagram A of the utility model.

[0030] Figure 3 It is a direct current conversion alternating current driving circuit schematic diagram B of the utility model.

[0031] Figure 4 It is a direct current conversion alternating current driving circuit schematic diagram C of the utility model.

[0032] Figure 5 It is a MCU circuit schematic diagram of the utility model.

[0033] Figure 6 It is a MCU power supply circuit schematic diagram of the utility model.

[0034] Figure 7 It is a 12V power supply circuit schematic diagram of the utility model.

[0035] Figure 8 It is an address dialing circuit schematic diagram of the utility model.

[0036] Figure 9This is a schematic diagram of the communication interface circuit of a utility model.

[0037] Figure 10 This is a schematic diagram of a 0-10V adjustment circuit for a utility model. Detailed Implementation

[0038] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of this application with unnecessary detail.

[0039] It should also be understood that the terminology used in this application specification is for the purpose of describing particular embodiments only and is not intended to limit the application. As used in this application specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0040] The following is in conjunction with the appendix to this application specification. Figures 1-10 The technical solutions in the embodiments of this application are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0041] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0042] like Figure 1 As shown, a DC 48V two-wire power line carrier system is provided. The system includes a 12V power supply circuit, an MCU power supply circuit, an MCU, an address DIP switch circuit, a communication interface circuit, and a DC-to-AC conversion drive circuit.

[0043] The system loads the 48V transmitted over the two lines with the serial signal and outputs a ±48V AC square wave signal.

[0044] The MCU is connected with MCU power supply circuit, address dialing circuit, communication interface circuit and direct current conversion alternating current driving circuit respectively, the MCU power supply circuit is also connected with 12V power supply circuit, the 12V power supply circuit is also connected with 0-10V adjusting circuit, the communication interface circuit is connected with 0-10V adjusting circuit.

[0045] Further, the direct current conversion alternating current driving circuit includes chip U6 and chip U7, the No.1 end of the chip U6 is connected with input 15V end, one end of capacitor C10 and positive pole of diode D4 respectively, the other end of the capacitor C10 is connected with No.4 end of the chip U6 and grounded, the negative pole of the diode D4 is connected with No.8 end of the chip U6 and one end of capacitor CE3 respectively, the other end of the capacitor CE3 is connected with No.6 end of the chip U6, No.3 end of triode Q3, S end of triode Q2, D end of triode Q7, LED A- end and one end of diode group respectively, the No.1 end of the triode Q3 is connected with No.7 end of the chip U6 and one end of resistor R15 respectively, the other end of the resistor R15 is connected with No.2 end of the triode Q3 and G end of the triode Q2 respectively, the D end of the triode Q2 is connected with VIN end, the No.5 end of the chip U6 is connected with one end of resistor R20 and No.1 end of triode Q8 respectively, the other end of the resistor R20 is connected with No.2 end of the triode Q8 and G end of the triode Q7 respectively, the No.3 end of the triode Q8 is connected with CS end and S end of the triode Q7 respectively.

[0046] The No.1 end of the chip U7 is connected with input 15V end, one end of capacitor C12 and positive pole of diode D5 respectively, the other end of the capacitor C12 is connected with No.4 end of the chip U7 and grounded, the negative pole of the diode D5 is connected with No.8 end of the chip U7 and one end of capacitor CE4 respectively, the other end of the capacitor CE4 is connected with No.6 end of the chip U7, No.3 end of triode Q10, S end of triode Q9, D end of triode Q11, LED B- end and the other end of diode group respectively, the No.1 end of the triode Q10 is connected with No.7 end of the chip U7 and one end of resistor R15 respectively, the other end of the resistor R15 is connected with No.2 end of the triode Q10 and G end of the triode Q9 respectively, the D end of the triode Q9 is connected with VIN end, the No.5 end of the chip U7 is connected with one end of resistor R20 and No.1 end of triode Q12 respectively, the other end of the resistor R20 is connected with No.2 end of the triode Q12 and G end of the triode Q11 respectively, the No.3 end of the triode Q12 is connected with CS end, one end of resistor R30, one end of resistor R31 and S end of the triode Q11 respectively; the other end of the resistor R30 is connected with the other end of the resistor R31 and grounded.

[0047] The diode group includes two parallel diode series, each of which includes six diodes connected in series, with the cathode of the left diode connected to the D terminal of triode Q7, and the anode of the right diode connected to the D terminal of triode Q7; or the anode of the left diode is connected to the D terminal of triode Q7, and the cathode of the right diode is connected to the D terminal of triode Q7.

[0048] Further, the HIN terminal is connected to the 3 terminal of triode Q1, the 2 terminal of triode Q1 is grounded, and the 1 terminal of triode Q1 is connected to one end of resistor R14.

[0049] The LIN terminal is connected to the 3 terminal of triode Q5, the 2 terminal of triode Q5 is grounded, and the 1 terminal of triode Q5 is connected to one end of resistor R18.

[0050] The other end of resistor R14 is respectively connected to the other end of resistor R18, the 3 terminal of triode Q4, and one end of resistor R19, the 2 terminal of triode Q4 is respectively connected to one end of resistor R16 and 3V3 terminal, the 1 terminal of triode Q4 is respectively connected to one end of resistor R17, the other end of resistor R17 is respectively connected to SP terminal, the other end of resistor R16 and 3 terminal of triode Q6, the other end of resistor R19 is respectively connected to one end of resistor R21, one end of capacitor C11, one end of resistor R23, 1 terminal of triode Q6 and unlock terminal, the other end of resistor R23 is respectively connected to the other end of capacitor C11 and 2 terminal of triode Q6, and then grounded.

[0051] The LIN terminal is respectively connected to the D terminal of triode Q13 and one end of resistor R25, the other end of resistor R25 is connected to the voltage 5V terminal, the G terminal of triode Q13 is connected to one end of resistor R27, the other end of resistor R27 is respectively connected to UART_TX terminal and one end of resistor R29, the other end of resistor R27 is connected to HIN terminal, and the S terminal of triode Q13 is grounded.

[0052] Further, the MCU is chip U3, the unlock terminal of the direct current to alternating current driving circuit is connected to the 11 terminal of chip U3, the UART_TX terminal of the direct current to alternating current driving circuit is connected to the 2 terminal of chip U3, and the SP terminal of the direct current to alternating current driving circuit is connected to the 14 terminal of chip U3.

[0053] Further, the MCU power supply circuit comprises a chip U2, one end of a resistor R7 and one end of a capacitor C2 are connected to the No. 3 terminal of the chip U2, the other end of the resistor R7 is connected to a voltage of 12V, the other end of the capacitor C2 is connected to the No. 2 terminal of the chip U2 and one end of a capacitor C3 and then grounded, the other end of the capacitor C3 is connected to the No. 1 terminal of the chip U2 and a voltage of 5V respectively.

[0054] The No. 3 terminal of the chip U2 is connected to the No. 1 terminal of a chip U5, the No. 2 terminal of the chip U2 is connected to the No. 1 terminal of the chip U5, and the No. 20 terminal of the chip U2 is connected to the No. 2 terminal and the No. 3 terminal of the chip U5.

[0055] Further, the 12V power supply circuit comprises a VIN end, the VIN end is connected to a voltage of 48V, one end of a capacitor C33, one end of a capacitor C34, one end of a capacitor C35 and the anode of a diode D1 respectively, the cathode of the diode D1 is connected to one end of a resistor R6, the other end of the resistor R6 is connected to one end of a capacitor CE1 and one end of an inductor L2 respectively, the other end of the inductor L2 is connected to one end of a resistor R1, one end of the capacitor CE1 and the No. 2 terminal of a chip U1 respectively, the other end of the resistor R1 is connected to one end of a capacitor C1 and the VDD terminal of the chip U1 respectively, the other end of the capacitor C33 is connected to the other end of the capacitor C34, the other end of the capacitor C35, the other end of the capacitor CE1 and the other end of a capacitor CE2 respectively and then grounded;

[0056] The other end of the capacitor C1 is grounded, the CS terminal of the chip U1 is connected to one end of a resistor R2, the other end of the resistor R2 is connected to the No. 4 terminal of the chip U1, the cathode of a diode D2 and one end of an inductor L3 respectively, the anode of the diode D2 is grounded, the other end of the inductor L3 is connected to one end of a resistor R3, one end of an inductor C4, one end of an inductor C5, one end of a resistor R5 and a 12V end respectively,

[0057] The other end of the resistor R3 is connected to one end of a resistor R4 and a VFB end respectively, the other end of the resistor R4 is grounded;

[0058] The other end of the inductor C4 is connected to the other end of the inductor C4 and the other end of the resistor R5 respectively and then grounded.

[0059] Further, the address dialing circuit includes dialer SW1, the 4, 5, 6 end of dialer SW1 is connected with 5V end, the 1st end of dialer SW1 is connected with the 17th end of chip U3 through ADD1 end, the 2nd end of dialer SW1 is connected with the 16th end of chip U3 through ADD2 end, the 31st end of dialer SW1 is connected with the 15th end of chip U3 through ADD3 end, the 1st end of dialer SW1 is connected with the one end of resistance R11, the 2nd end of dialer SW1 is connected with the one end of resistance R12, the 3rd end of dialer SW1 is connected with the one end of resistance R13, the other end of resistance R11 is connected with the other end of resistance R12 and the other end of resistance R13 respectively and then grounded.

[0060] Further, the communication interface circuit includes chip 5, the 8th end of chip 5 is connected with the one end of resistance R9 and 5V voltage end respectively, the 7th end of chip 5 is connected with the other end of resistance R9 and the 1st end of interface J1 respectively, the 6th end of chip 5 is connected with the one end of resistance R10 and the 2nd end of interface J1 respectively, the 5th end of chip 5 is connected with the other end of resistance R10 and then grounded.

[0061] As shown in Figure 2 When the LIN / LIN pin of chip U6 or U7 receives an input signal, the internal circuit of the chip will generate a corresponding output signal according to the input signal. When the input signal makes the HO pin of the chip output high level and the LO pin output low level, the high level signal drives the corresponding MOSFET (such as Q2 or Q9) to conduct through resistance and transistor, and the low level signal makes the other MOSFET (such as Q7 or Q11) cut off. In this way, current can flow to the load through the conducting MOSFET, realizing the control of the load. By controlling the input signal of the chip, the functions of switching and dimming of the load can be realized.

[0062] As shown in Figure 3 When there is an input signal in the circuit, the signal first acts on the base of transistor Q5, controls the base current of Q1 through Q5, and then affects the current between the collector and emitter of Q1. The emitter current of Q1 is transmitted to the base of Q4 through resistance R11, and after amplification or level conversion by Q4, it is transmitted to the base of Q3 through resistance R16, and finally the processed signal is output at the emitter of Q3. Capacitor C11 can filter the output signal to obtain a more stable and pure signal.

[0063] As shown in Figure 4As shown, when a high-level signal is input to the UART_TX terminal, current flows through the resistor R27 to the gate of the MOSFET, causing the gate voltage to rise. When the gate voltage reaches the turn-on voltage (threshold voltage) of the MOSFET, the MOSFET turns on, and at this time, the 5V power supply forms a loop through the resistor R25 and the conducting MOSFET to the ground, and the LIN terminal outputs a low level.

[0064] When a low-level signal is input to the UART_TX terminal, the gate voltage of the MOSFET is not sufficient to turn it on, and the MOSFET is in the off state. The 5V power supply outputs a high level at the LIN terminal through the resistor R25.

[0065] As shown, Figure 7 The input power VIN+ passes through the input filter circuit (capacitors C1, C2, C3, C4, and diode D1) to obtain a relatively pure DC voltage, and then passes through the LC filter circuit composed of inductor L2 and capacitor C5 for further filtering, and then inputs to the power conversion chip U1. The chip U1 converts the input voltage to 12V output according to the internal circuit and external feedback resistor (R1, R2) settings. The output 12V voltage is filtered by the output filter circuit composed of inductor L3 and capacitors C6, C7, and then provides a stable 12V power supply for the load.

[0066] As shown, Figure 8 By operating the switch SW1, the level state of the nodes ADD1, ADD2, ADD3 can be changed, thereby realizing control or signal output of the subsequent circuit. The presence of the pull-down resistor ensures that the node can stably be in a low level state when the switch does not connect the node to a high level (5V), avoiding uncertain level states and improving the reliability and stability of the circuit.

[0067] As shown, Figure 9 In 485 communication, multiple devices communicate through the 485 bus. When the device in the circuit needs to receive data, the external control signal makes DIRECTION low level, and the chip U5 enters the receiving mode. The differential signal on the 485 bus is input to the chip through the A, B pins, and the chip converts it to a single-ended signal output from the RO pin for subsequent circuit processing. When the device needs to send data, the external control signal makes DIRECTION high level, and the chip U5 enters the sending mode. The data to be sent is input from the DI pin, and the chip converts it to a differential signal sent to the 485 bus through the A, B pins, realizing data communication with other devices.

[0068] As shown, Figure 10As shown, the circuit principle is that the 12V power supply is grounded through capacitor C21, which plays a filtering role here, can stabilize the power supply voltage, reduce the influence of voltage fluctuation on the circuit, and provide a relatively pure DC power supply for the circuit;

[0069] The brightness signal input terminal is used to receive an external brightness signal, which is 10V_1. The input signal will first pass through the voltage divider circuit composed of resistors R31 and R38 for preliminary voltage division processing to adapt to the working range and requirements of the subsequent circuit;

[0070] Diodes D9 and D10 are connected in reverse parallel across the input terminal, which serves as an amplitude limiting protection function. When the input signal voltage is too high, the diode will be turned on to clamp the excessive voltage within a certain range, preventing the subsequent circuit components from being damaged by excessive voltage;

[0071] Operational amplifier U4 is the core component of the circuit. Its pin 2 (inverted input terminal) is connected to the node after the input signal voltage division through resistor R46, pin 3 (non-inverting input terminal) is grounded through resistor R51, and pin 2 and pin 6 (output terminal) are connected through resistors R52 and R53 to form a feedback network;

[0072] This connection forms an inverting amplifier circuit. According to the virtual short and virtual open characteristics of the operational amplifier, the input signal is divided by resistors R31 and R38, and a voltage difference is formed between the inverting input terminal and the non-inverting input terminal of the operational amplifier. After amplification by the operational amplifier, the output is obtained from the output terminal;

[0073] Capacitors C and C2 are used for high-frequency filtering to reduce high-frequency noise interference on the circuit, making the output signal more stable and pure;

[0074] After the external brightness signal is input into the circuit, it first passes through the amplitude limiting protection of the diode and the voltage division processing of the resistor, and then enters the operational amplifier for amplification and filtering processing, and finally outputs the processed signal from the output terminal of the operational amplifier. The output signal can be used in subsequent circuits or systems.

Claims

1. A DC 48V two-wire power line carrier system, characterized in that, The system includes a 12V power supply circuit, an MCU power supply circuit, an MCU, an address DIP switch circuit, a communication interface circuit, and a DC-to-AC drive circuit. The MCU is connected to the MCU power supply circuit, the address dialing circuit, the communication interface circuit, and the DC-to-AC drive circuit. The MCU power supply circuit is also connected to the 12V power supply circuit, the 12V power supply circuit is also connected to the 0-10V adjustment circuit, and the communication interface circuit is connected to the 0-10V adjustment circuit.

2. The system according to claim 1, characterized in that, The DC-to-AC drive circuit includes chip U6 and chip U7. Terminal 1 of chip U6 is connected to the 15V input terminal, one end of capacitor C10, and the positive terminal of diode D4. The other end of capacitor C10 is connected to terminal 4 of chip U6 and then grounded. The negative terminal of diode D4 is connected to terminal 8 of chip U6 and one end of capacitor CE3. The other end of capacitor CE3 is connected to terminal 6 of chip U6, terminal 3 of transistor Q3, the source terminal of transistor Q2, the drain terminal of transistor Q7, and the LED. The A- terminal and one end of the diode group are connected. Terminal 1 of transistor Q3 is connected to terminal 7 of chip U6 and one end of resistor R15. The other end of resistor R15 is connected to terminal 2 of transistor Q3 and the G terminal of transistor Q2. Terminal D of transistor Q2 is connected to VIN terminal. Terminal 5 of chip U6 is connected to one end of resistor R20 and terminal 1 of transistor Q8. The other end of resistor R20 is connected to terminal 2 of transistor Q8 and the G terminal of transistor Q7. Terminal 3 of transistor Q8 is connected to CS terminal and S terminal of transistor Q7. Terminal 1 of chip U7 is connected to the 15V input terminal, one end of capacitor C12, and the positive terminal of diode D5. The other end of capacitor C12 is connected to terminal 4 of chip U7 and then grounded. The negative terminal of diode D5 is connected to terminal 8 of chip U7 and one end of capacitor CE4. The other end of capacitor CE4 is connected to terminal 6 of chip U7, terminal 3 of transistor Q10, the source terminal of transistor Q9, the drain terminal of transistor Q11, and LED. The B-terminal and the other end of the diode group are connected. Terminal 1 of transistor Q10 is connected to terminal 7 of chip U7 and one end of resistor R15. The other end of resistor R15 is connected to terminal 2 of transistor Q10 and the G-terminal of transistor Q9. Terminal D of transistor Q9 is connected to VIN. Terminal 5 of chip U7 is connected to one end of resistor R20 and terminal 1 of transistor Q12. The other end of resistor R20 is connected to terminal 2 of transistor Q12 and the G-terminal of transistor Q11. Terminal 3 of transistor Q12 is connected to the CS-terminal, one end of resistor R30, one end of resistor R31, and the S-terminal of transistor Q11. The other end of resistor R30 is connected to the other end of resistor R31 and then grounded.

3. The system according to claim 2, characterized in that, The HIN terminal is connected to terminal 3 of transistor Q1, terminal 2 of transistor Q1 is grounded, and terminal 1 of transistor Q1 is connected to one end of resistor R14. The LIN terminal is connected to terminal 3 of transistor Q5, terminal 2 of transistor Q5 is grounded, and terminal 1 of transistor Q55 is connected to one end of resistor R18. The other end of resistor R14 is connected to the other end of resistor R18, terminal 3 of transistor Q4, and one end of resistor R19. Terminal 2 of transistor Q4 is connected to one end of resistor R16 and the 3V3 terminal. Terminal 1 of transistor Q4 is connected to one end of resistor R17. The other end of resistor R17 is connected to the SP terminal and the other end of resistor R16 and terminal 3 of transistor Q6. The other end of resistor R19 is connected to one end of resistor R21, one end of capacitor C11, one end of resistor R23, terminal 1 of transistor Q6, and the unlock terminal. The other end of resistor R23 is connected to the other end of capacitor C11 and terminal 2 of transistor Q6, and then grounded. The LIN terminal is connected to the D terminal of transistor Q13 and one end of resistor R25. The other end of resistor R25 is connected to the 5V voltage terminal. The G terminal of transistor Q13 is connected to one end of resistor R27. The other end of resistor R27 is connected to the UART_TX terminal and one end of resistor R29. The other end of resistor R27 is connected to the HIN terminal. The S terminal of transistor Q13 is grounded.

4. The system according to claim 1, characterized in that, The MCU is chip U3. The unlock terminal of the DC-to-AC drive circuit is connected to terminal 11 of chip U3. The UART_TX terminal of the DC-to-AC drive circuit is connected to terminal 2 of chip U3. The SP terminal of the DC-to-AC drive circuit is connected to terminal 14 of chip U3.

5. The system according to claim 1, characterized in that, The MCU power supply circuit includes chip U2. Terminal 3 of chip U2 is connected to one end of resistor R7 and one end of capacitor C2. The other end of resistor R7 is connected to a voltage of 12V. The other end of capacitor C2 is connected to terminal 2 of chip U2 and one end of capacitor C3 and then grounded. The other end of capacitor C3 is connected to terminal 1 of chip U2 and a voltage of 5V. Terminal 3 of chip U2 is connected to terminal 1 of chip U5, terminal 2 of chip U2 is connected to terminal 1 of chip U5, and terminal 20 of chip U2 is connected to terminals 2 and 3 of chip U5.

6. The system according to claim 1, characterized in that, The 12V power supply circuit includes a VIN terminal, which is connected to 48V, one end of capacitor C33, one end of capacitor C34, one end of capacitor C35, and the positive terminal of diode D1. The negative terminal of diode D1 is connected to one end of resistor R6. The other end of resistor R6 is connected to one end of capacitor CE1 and one end of inductor L2. The other end of inductor L2 is connected to one end of resistor R1, one end of capacitor CE1, and terminal 2 of chip U1. The other end of resistor R1 is connected to one end of capacitor C1 and the VDD terminal of chip U1. The other end of capacitor C33 is connected to the other ends of capacitor C34, capacitor C35, capacitor CE1, and capacitor CE2, and then grounded. The other end of capacitor C1 is grounded. The CS terminal of chip U1 is connected to one end of resistor R2. The other end of resistor R2 is connected to terminal 4 of chip U1, the cathode of diode D2, and one end of inductor L3. The anode of diode D2 is grounded. The other end of inductor L3 is connected to one end of resistor R3, one end of inductor C4, one end of inductor C5, one end of resistor R5, and the 12V terminal. The other end of resistor R3 is connected to one end of resistor R4 and VFB terminal respectively, and the other end of resistor R4 is grounded; The other end of the inductor C4 is connected to the other end of the inductor C4 and the other end of the resistor R5, and then grounded.

7. The system according to claim 5, characterized in that, The address DIP switch circuit includes a DIP switch SW1. Terminals 4, 5, and 6 of the DIP switch SW1 are all connected to a 5V terminal. Terminal 1 of the DIP switch SW1 is connected to terminal 17 of chip U3 via the ADD1 terminal. Terminal 2 of the DIP switch SW1 is connected to terminal 16 of chip U3 via the ADD2 terminal. Terminal 31 of the DIP switch SW1 is connected to terminal 15 of chip U3 via the ADD3 terminal. Terminal 1 of the DIP switch SW1 is connected to one end of resistor R11. Terminal 2 of the DIP switch SW1 is connected to one end of resistor R12. Terminal 3 of the DIP switch SW1 is connected to one end of resistor R13. The other end of resistor R11 is connected to the other ends of resistors R12 and R13 respectively, and then grounded.

8. The system according to claim 5, characterized in that, The communication interface circuit includes a chip 5. Terminal 8 of the chip 5 is connected to one end of resistor R9 and a 5V voltage terminal. Terminal 7 of the chip 5 is connected to the other end of resistor R9 and terminal 1 of interface J1. Terminal 6 of the chip 5 is connected to one end of resistor R10 and terminal 2 of interface J1. Terminal 5 of the chip 5 is connected to the other end of resistor R10 and then grounded.

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