Direct-current power line communication circuit based on voltage regulation

Abstract

The utility model discloses a direct-current power line communication circuit based on voltage regulation, which comprises a host computer and a slave computer which are connected through a power supply positive electrode and a power supply negative electrode, each of the host and the slave comprises a coder-decoder, and a signal modulation transmitting circuit and a demodulation receiving circuit which are connected with the signal end of the coder-decoder and are connected to the positive electrode of the power supply. According to the utility model, the structural arrangement is reasonable, the host and the slave are connected through the power supply positive electrode and the power supply negative electrode, and the coder-decoder is arranged on the power supply positive electrode to cooperate with the signal modulation transmitting circuit and the demodulation receiving circuit, so that double-wire power supply and signal transmission can be realized, the arrangement of signal wires can be reduced, and the wiring difficulty can be reduced; and meanwhile, signal sending and receiving are facilitated, signal transmission effectiveness and stability are guaranteed, the installation cost is reduced, and the applicability is high.

Description

Technical Field

[0001] This utility model belongs to the field of communication circuit technology, specifically relating to a DC power line communication circuit based on voltage regulation. Background Technology

[0002] With the rapid development of electronic technology, more and more DC power supply systems need to exchange data. Traditionally, dedicated buses are needed for data exchange between devices, such as CAN and RS485 data lines. Although these can achieve data exchange, they require independent communication lines, which not only increases the complexity of wiring but also requires dedicated wireless communication devices, greatly increasing costs. Furthermore, the signals are easily interfered with, affecting the stability of operation. Summary of the Invention

[0003] The purpose of this invention is to provide a DC power line communication circuit based on voltage regulation that has a reasonable structural design and is conducive to cost reduction.

[0004] The technical solution to achieve the purpose of this utility model is a DC power line communication circuit based on voltage regulation, including a host and a slave connected through the positive and negative terminals of the power supply. Both the host and the slave include an encoder / decoder, a signal modulation and transmission circuit connected to the signal terminal of the encoder / decoder and connected to the positive terminal of the power supply, and a demodulation and reception circuit.

[0005] A further preferred embodiment is that the signal modulation and transmission circuit includes a transistor, a first resistor, a second resistor, a third resistor, a fourth resistor, and a MOSFET;

[0006] The source and drain of the MOS transistor are connected in series to the positive terminal of the power supply, and the gate of the MOS transistor is connected to the collector of the transistor through a second resistor. The first resistor is connected between the gate and the source of the MOS transistor.

[0007] The base of the transistor is connected to the PWM encoding terminal of the encoder / decoder via a third resistor, the emitter of the transistor is grounded, and the fourth resistor is connected between the base and emitter of the transistor.

[0008] A further preferred embodiment is that the MOS transistor is a P-channel MOS transistor.

[0009] A further preferred embodiment is that the transistor is an NPN transistor.

[0010] A further preferred embodiment is that the demodulation receiving circuit includes a fifth resistor, a sixth resistor, and a seventh resistor;

[0011] The fifth resistor and the sixth resistor are connected in series, with the end of the fifth resistor connected to the positive terminal of the power supply and the end of the sixth resistor grounded.

[0012] One end of the seventh resistor is connected to the connection point of the fifth and sixth resistors, and the other end is connected to the ADC decoding end of the encoder / decoder.

[0013] A further preferred embodiment is that a filter capacitor is provided at the slave end of the positive terminal of the power supply.

[0014] This utility model has positive effects: its structure is reasonably designed, with the host and slave connected through the positive and negative terminals of the power supply. Furthermore, an encoder-decoder is set on the positive terminal of the power supply to work with the signal modulation and transmission circuit and the demodulation and reception circuit, which can realize dual-line power supply and signal transmission. This helps to reduce the laying of signal lines, lowers the difficulty of wiring, and also helps to realize signal transmission and reception, ensuring the effectiveness and stability of signal transmission. It also helps to reduce installation costs and has strong applicability. Attached Figure Description

[0015] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the coding rules in this utility model.

[0018] Figure label: Power supply positive terminal 1, power supply negative terminal 2, master unit 3, slave unit 4, encoder / decoder 5, signal modulation and transmission circuit 6, demodulation and reception circuit 7, filter capacitor 8. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0020] See Figures 1 to 2As shown, a DC power line communication circuit based on voltage regulation includes a host 3 and a slave 4 connected through a positive power supply terminal 1 and a negative power supply terminal 2. Both the host and slave include a codec 5, a signal modulation and transmission circuit 6 connected to the signal terminal of the codec and connected to the positive power supply terminal, and a demodulation and reception circuit 7. In this embodiment, the signal modulation and transmission circuit 6 and the demodulation and reception circuit 7 are connected to the positive power supply terminal. The host and slave can communicate via the positive power supply terminal without requiring additional dedicated communication lines, which reduces wiring complexity and assembly and usage costs.

[0021] In this embodiment, the signal modulation and transmission circuit includes a transistor Q1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a MOSFET Q2. During connection, the source and drain of the MOSFET are connected in series to the positive terminal of the power supply. The gate of the MOSFET is connected to the collector of the transistor through the second resistor. The first resistor is connected between the gate and source of the MOSFET. The base of the transistor is connected to the PWM encoding terminal of the encoder / decoder through the third resistor. The emitter of the transistor is grounded. The fourth resistor is connected between the base and emitter of the transistor. In this embodiment, the MOSFET is a P-channel MOSFET. The transistor is an NPN transistor.

[0022] The demodulation receiving circuit includes a fifth resistor R5, a sixth resistor R6, and a seventh resistor R7. When connected, the fifth resistor and the sixth resistor are connected in series, with one end of the fifth resistor connected to the positive terminal of the power supply and the other end of the sixth resistor grounded. One end of the seventh resistor is connected to the connection point of the fifth and sixth resistors, and the other end is connected to the ADC decoding terminal of the encoder / decoder.

[0023] A filter capacitor 8 is provided at the slave end of the positive terminal of the power supply.

[0024] When in use, when the host needs to send a signal, the host's transmission signal is encoded according to the encoding rules. The host's transmission data PWM encoding port outputs PWM modulation signals according to the encoding and timing to change the supply voltage of the positive terminal of the power supply. When the slave receiver detects that there is a signal being transmitted from the positive terminal of the power supply, the slave demodulation receiving circuit starts to read the voltage signal of the positive terminal of the power supply and decodes the read voltage signal according to the encoding rules.

[0025] When the slave device needs to send a signal, it must do so simultaneously with the master device sending a signal. That is, while the master device is sending a signal, a PWM modulation signal is synchronously output to the positive terminal of the power supply according to the encoding rules. At this time, the master device can read the voltage signal of the positive terminal of the power supply through the receiving port, and decodes the received signal according to the encoding rules. Figure 2In this encoding, the data 1 indicates that the voltage is normal and the voltage width is half of the start signal, while 0 indicates that the voltage is 80% of the normal voltage and the voltage width is half of the start signal.

[0026] This utility model has positive effects: its structure is reasonably designed, with the host and slave connected through the positive and negative terminals of the power supply. Furthermore, an encoder-decoder is set on the positive terminal of the power supply to work with the signal modulation and transmission circuit and the demodulation and reception circuit, which can realize dual-line power supply and signal transmission. This helps to reduce the laying of signal lines, lowers the difficulty of wiring, and also helps to realize signal transmission and reception, ensuring the effectiveness and stability of signal transmission. It also helps to reduce installation costs and has strong applicability.

[0027] The standard parts used in this embodiment can be purchased directly from the market, and the non-standard structural parts described in the instruction manual can also be processed without any doubt based on existing technical common sense. At the same time, the connection methods of each component adopt mature conventional methods in the existing technology, and the machinery, parts and equipment all adopt conventional models in the existing technology, so they will not be described in detail here.

[0028] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all embodiments here. However, these obvious variations or modifications derived from the essential spirit of this utility model still fall within the protection scope of this utility model.

Claims

1. A voltage-regulated direct power line communication circuit comprising a master and a slave connected by a power supply positive and a power supply negative, characterized in that: Both the host and slave devices include a codec, a signal modulation and transmission circuit connected to the signal terminal of the codec and connected to the positive terminal of the power supply, and a demodulation and reception circuit.

2. A voltage-regulated DC power line communication circuit according to claim 1, characterized in that: The signal modulation and transmission circuit includes a transistor, a first resistor, a second resistor, a third resistor, a fourth resistor, and a MOSFET; The source and drain of the MOS transistor are connected in series to the positive terminal of the power supply, and the gate of the MOS transistor is connected to the collector of the transistor through a second resistor. The first resistor is connected between the gate and the source of the MOS transistor. The base of the transistor is connected to the PWM encoding terminal of the encoder / decoder via a third resistor, the emitter of the transistor is grounded, and the fourth resistor is connected between the base and emitter of the transistor.

3. A voltage-regulated DC power line communication circuit according to claim 2, characterized in that: The MOS transistor is a P-channel MOS transistor.

4. A voltage-regulated DC power line communication circuit according to claim 2, characterized in that: The transistor is an NPN type transistor.

5. A voltage-regulated DC power line communication circuit according to claim 1, characterized in that: The demodulation receiving circuit includes a fifth resistor, a sixth resistor, and a seventh resistor; The fifth resistor and the sixth resistor are connected in series, with the end of the fifth resistor connected to the positive terminal of the power supply and the end of the sixth resistor grounded. One end of the seventh resistor is connected to the connection point of the fifth and sixth resistors, and the other end is connected to the ADC decoding end of the encoder / decoder.

6. A voltage-regulated DC power line communication circuit according to claim 1, characterized in that: A filter capacitor is provided at the slave end of the positive terminal of the power supply.

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