A power line based current modulation communication apparatus

Abstract

The utility model provides a kind of current modulation communication device based on power cord, including host module and slave module, the host module includes host modulation chip U2, dummy load resistance RL, resistance R1, resistance R2 and MOS tube Q1, the slave module includes slave modulation chip U1, operational amplifier chip U3, resistance R3, resistance R4 and resistance R5.This device solves the problem of high cost, complex operation, maintenance difficulty and other problems caused by additional data line in traditional master-slave communication, realizes communication with two power lines without affecting the normal operation of master-slave machine, with the beneficial effects of significantly reduced cost, simplified operation and maintenance, improved space utilization, and no impact on normal work.

Description

Technical Field

[0001] This utility model relates to the field of master-slave communication technology, and in particular to a current modulation communication device based on a power line. Background Technology

[0002] In existing master-slave communication technologies, traditional solutions require an additional data cable as the communication carrier, in addition to the power and ground wires. This approach has several drawbacks in practical applications. First, it is costly. Regarding wiring, the extra data cable directly increases procurement costs, and the cost difference becomes more pronounced as the distance between the master and slave devices increases. In terms of labor, the additional data cable complicates the soldering process, requiring workers to distinguish the functions of the three wires, increasing soldering time and indirectly raising labor costs. Second, it has a low tolerance for operational errors. Distinguishing between the three wires requires workers to have higher operational proficiency, making wiring errors prone to occur in actual production, such as mistakenly connecting the data cable to the power cable causing a short circuit, or reversing the positive and negative terminals and damaging the equipment. Third, it is difficult to maintain. During later maintenance, troubleshooting requires checking the continuity and connection status of all three wires simultaneously, increasing troubleshooting time. If the wiring ages, the replacement cost and workload of the three wires are higher than that of the two wires. Fourth, it occupies a lot of space. When assembling the equipment internally, more wiring space needs to be reserved for the three wires. For miniaturized equipment, this may limit the structural design of the equipment and prevent a more compact layout from being achieved. Summary of the Invention

[0003] This invention aims to solve the above-mentioned technical problems by providing a current modulation communication device based on power lines. This device addresses the issues of high cost, complex operation, and difficult maintenance caused by additional data lines in traditional master-slave communication, and achieves communication with two power lines without affecting the normal operation of the master and slave devices.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a current modulation communication device based on a power line, comprising a master module and a slave module. The master module includes a master modulation chip U2, a dummy load resistor RL, a resistor R1, a resistor R2, and a MOSFET Q1. The slave module includes a slave modulation chip U1, an operational amplifier chip U3, resistors R3, R4, and R5.

[0005] Pin 5 of the master modulation chip U2 is the signal output terminal. After being connected in series with resistor R1, it is connected to one end of resistor R2 and the gate of MOSFET Q1. The other end of resistor R2 and the source of MOSFET Q1 are both grounded. The drain of MOSFET Q1 is connected in series with dummy load resistor RL and then connected to pin 1 of slave modulation chip U1 and power supply VCC. Pin 1 of master modulation chip U2 is connected to power supply VCC. Pin 8 of master modulation chip U2 is connected to the CIN+ pin of operational amplifier chip U3, one end of resistor R5, and GND. The CIN- pin of operational amplifier chip U3 is connected to one end of resistor R3 and one end of resistor R4. The other end of resistor R3 is connected to the other end of resistor R5 and GND. Pin 8 of slave modulation chip U1 is connected to GND. Pin 5 of slave modulation chip U1 is connected to the CO pin of operational amplifier chip U3 and the other end of resistor R4.

[0006] Both the master modulation chip U2 and the slave modulation chip U1 are IC-8PIN.

[0007] The advantages and positive effects of this utility model are as follows: A current modulation communication device based on power lines solves the problems of high cost, complex operation, and difficult maintenance caused by additional data lines in traditional master-slave communication. It achieves communication with only two power lines without affecting the normal operation of the master and slave devices, and has the following beneficial effects: First, the cost is significantly reduced. The cost of wires is reduced by 1 / 3, saving about 30% in wire costs; the simplified wiring process shortens the soldering time, reduces the defect rate, and reduces material waste caused by errors. Second, operation and maintenance are simplified. Only the two power lines need to be distinguished, and workers can quickly get started without professional training. During later maintenance, only the status of the two lines needs to be checked, greatly improving troubleshooting efficiency. Third, space utilization is improved. The wiring design of two lines saves 30% of the internal assembly space, which facilitates the miniaturization and compact design of the equipment. Fourth, it does not affect normal operation. The communication process is achieved through current modulation, and the modulation current is only a small change in the normal operating current of the circuit, which will not affect the power supply stability of the master and slave devices, ensuring the normal operation of the equipment. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the circuit structure and current flow of a current modulation communication device based on a power line. Detailed Implementation

[0009] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0010] like Figure 1As shown, a current modulation communication device based on a power line includes a master module and a slave module. The master module includes a master modulation chip U2, a dummy load resistor RL, a resistor R1, a resistor R2, and a MOSFET Q1. The slave module includes a slave modulation chip U1, an operational amplifier chip U3, resistors R3, R4, and R5.

[0011] Pin 5 of the master modulation chip U2 is the signal output terminal. After being connected in series with resistor R1, it is connected to one end of resistor R2 and the gate of MOSFET Q1. The other end of resistor R2 and the source of MOSFET Q1 are both grounded. The drain of MOSFET Q1 is connected in series with dummy load resistor RL and then connected to pin 1 of slave modulation chip U1 and power supply VCC. Pin 1 of master modulation chip U2 is connected to power supply VCC. Pin 8 of master modulation chip U2 is connected to the CIN+ pin of operational amplifier chip U3, one end of resistor R5, and GND. The CIN- pin of operational amplifier chip U3 is connected to one end of resistor R3 and one end of resistor R4. The other end of resistor R3 is connected to the other end of resistor R5 and GND. Pin 8 of slave modulation chip U1 is connected to GND. Pin 5 of slave modulation chip U1 is connected to the CO pin of operational amplifier chip U3 and the other end of resistor R4.

[0012] Both the master modulation chip U2 and the slave modulation chip U1 are IC-8PIN.

[0013] The working principle of a current modulation communication device based on a power line: the host sends signals by controlling the current change in the control loop, and the slave receives signals by sampling the current change. The specific process is as follows:

[0014] 1. Signal Transmission (Main Unit): Pin 5 of the main unit modulation chip U2 outputs a digital signal (high level represents "1", low level represents "0"). When the output is high, the MOSFET Q1 is turned on, the dummy load resistor RL is connected to the circuit, and the circuit generates current; when the output is low, the MOSFET Q1 is turned off, and the circuit current is 0.

[0015] 2. Signal transmission: Since the master and slave are connected in series in the same power circuit, according to the principle that the current in a series circuit is equal, the current change in the master circuit will be synchronously reflected in the sampling resistor R5 of the slave circuit.

[0016] 3. Signal reception (slave): The sampling resistor R5 converts the current change into a voltage signal (when the current I flows through the resistor R5, the voltage U = I × R5); the operational amplifier chip U3 amplifies the voltage signal (the amplification factor is set by the external resistor), so that pin 5 of the slave modulation chip U1 obtains a high or low level signal synchronized with pin 5 of the master modulation chip U2; the slave executes the corresponding instruction according to the received signal.

[0017] In a preferred embodiment of a power line-based current modulation communication device, taking a "master controlling slave light switch" in a smart home as an example:

[0018] 1. When the host needs to send a "light on" signal (digital signal "1"): pin 5 of the host modulation chip U2 outputs a high level, the MOS transistor Q1 is turned on, and the dummy load RL generates a current of 100mA.

[0019] 2. The current is transmitted to the slave circuit through the power line, and a 0.001V voltage signal is generated across the sampling resistor R5 (0.012).

[0020] 3. Operational amplifier chip U3 amplifies the 0.001V voltage by 1000 times and outputs a 1V voltage to pin 5 of slave modulation chip U1. Slave modulation chip U1 recognizes the "1" signal and controls the light to turn on.

[0021] 4. When the host sends a "lights off" signal (digital signal "0"): pin 5 of the host modulation chip U2 outputs a low level, MOSFET Q1 is cut off, the loop current is 0, resistor R5 has no voltage signal, pin 5 of the slave modulation chip U1 receives the low level, and controls the lights to turn off.

[0022] During this process, the power supply voltage of the master and slave devices remained stable (e.g., 5V), and the changes in communication current did not affect the normal power supply of the lights, thus achieving compatibility between communication and power supply.

[0023] A current modulation communication device based on power lines solves the problems of high cost, complex operation, and difficult maintenance caused by additional data lines in traditional master-slave communication. It achieves communication with only two power lines without affecting the normal operation of the master and slave devices, offering the following advantages: First, significantly reduced cost. Cable costs are reduced by one-third, saving approximately 30% on cable expenses; simplified wiring procedures shorten soldering time, reduce defect rates, and minimize material waste due to errors. Second, simplified operation and maintenance. Only the two power lines need to be distinguished, allowing workers to quickly learn without specialized training. Later maintenance only requires checking the status of the two lines, significantly improving troubleshooting efficiency. Third, improved space utilization. The two-line wiring design saves 30% of internal assembly space, facilitating miniaturization and compact design of the equipment. Fourth, no impact on normal operation. Communication is achieved through current modulation, with the modulation current only showing a small change in the normal operating current of the circuit, ensuring the power supply stability of the master and slave devices and guaranteeing normal equipment operation.

[0024] The embodiments of this utility model have been described in detail above, but the content described is only a preferred embodiment of this utility model and should not be considered as limiting the scope of implementation of this utility model. All equivalent changes and improvements made within the scope of this utility model should still fall within the scope of this patent.

Claims

1. A current modulation communication device based on a power line, characterized in that: The system includes a master module and a slave module. The master module includes a master modulation chip U2, dummy load resistors RL, R1, R2, and a MOSFET Q1. The slave module includes a slave modulation chip U1, an operational amplifier chip U3, resistors R3, R4, and R5. Pin 5 of the master modulation chip U2 is the signal output terminal. After being connected in series with resistor R1, it is connected to one end of resistor R2 and the gate of MOSFET Q1. The other end of resistor R2 and the source of MOSFET Q1 are both grounded. The drain of MOSFET Q1 is connected in series with dummy load resistor RL and then connected to pin 1 of slave modulation chip U1 and power supply VCC. Pin 1 of master modulation chip U2 is connected to power supply VCC. Pin 8 of master modulation chip U2 is connected to the CIN+ pin of operational amplifier chip U3, one end of resistor R5, and GND. The CIN- pin of operational amplifier chip U3 is connected to one end of resistor R3 and one end of resistor R4. The other end of resistor R3 is connected to the other end of resistor R5 and GND. Pin 8 of slave modulation chip U1 is connected to GND. Pin 5 of slave modulation chip U1 is connected to the CO pin of operational amplifier chip U3 and the other end of resistor R4.

2. The current modulation communication device based on a power line according to claim 1, characterized in that: Both the master modulation chip U2 and the slave modulation chip U1 are IC-8PIN.

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