A direct current power line communication circuit

Abstract

This invention provides a DC power line communication circuit, relating to the field of DC power line communication. The circuit includes a signal transmitting module, a signal receiving module, and a filtering unit. The signal transmitting module is connected to the DC power line and is used to load communication data onto the DC power line via a switch control. The signal receiving module is also connected to the DC power line and is used to extract and identify valid communication data from the DC power line. The filtering unit is connected between the DC power line and the system power supply to isolate noise from the DC power line and provide a stable system power supply. This invention directly uses the DC power line to achieve data interaction between two devices, eliminating the need for a dedicated communication line; it achieves stable data transmission on the power communication bus, with data transmission and reception completed on the same power line; it reduces material costs and allows for a smaller product size.

Description

Technical Field

[0001] This utility model relates to the field of DC power line communication, specifically to a DC power line communication circuit that can directly use a DC power line to realize data interaction between two devices. Background Technology

[0002] Existing DC power line communication circuits, such as the common RS232 serial protocol, require two dedicated TX / RX cables to enable data exchange between two devices. However, existing systems have the following problems:

[0003] 1. It requires the design of a dedicated communication line and introduces additional environmental noise, resulting in a high communication error rate.

[0004] 2. A large capacitor is connected in parallel on the DC power communication bus so that the communication signal loaded on the DC power line will be absorbed by the large capacitor in parallel.

[0005] 3. Small household appliances are cost-sensitive; additional materials increase costs and hinder product miniaturization. Utility Model Content

[0006] In view of this, in order to solve the problem that existing communication circuits require dedicated communication ports and dedicated communication cables, the purpose of this utility model is to propose a DC power line communication circuit that directly uses a DC power line to realize data interaction between two devices without the need for a dedicated communication line; it realizes stable data transmission of the power communication bus, with data transmission and reception completed on the same power line; it reduces material costs and makes the product smaller.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] To achieve the above objectives, this utility model provides a DC power line communication circuit, including a signal transmitting module, a signal receiving module, and a filtering unit;

[0009] The signal transmitting module is connected to the DC power line and is used to load communication data onto the DC power line via a switch control; the signal receiving module is connected to the DC power line and is used to extract and identify valid communication data from the DC power line; the filtering unit is connected between the DC power line and the system power supply and is used to isolate noise from the DC power line and provide a stable system power supply.

[0010] As a further embodiment of this invention, the signal transmitting module includes a dual N-type MOSFET bootstrap circuit; the dual N-type MOSFET bootstrap circuit consists of a first MOSFET, a second MOSFET, a first resistor, and a second resistor; wherein, the gate of the second MOSFET is connected to the transmitting signal terminal of the microcontroller unit through the second resistor, the source is grounded, and the drain is connected to the gate of the first MOSFET; the source of the first MOSFET is grounded, the drain is connected to the DC power line, and the gate is connected to the system power supply through the first resistor; when a pulse signal is input to the transmitting signal terminal, the second MOSFET drives the switching state of the first MOSFET, loading communication data onto the DC power line.

[0011] As a further embodiment of this invention, the signal receiving module includes a comparator circuit, an RC filter circuit, and a voltage divider circuit. The voltage divider circuit consists of a third resistor and a fourth resistor connected in series, connected between the system power supply and ground. The voltage divider node is grounded through a first capacitor to form a reference level. The RC filter circuit consists of a fifth resistor and a second capacitor. One end of the fifth resistor is connected to the DC power line, and the other end is connected to the non-inverting input of the comparator circuit. The second capacitor is connected in parallel between the non-inverting input and ground. The inverting input of the comparator circuit is connected to the voltage divider node, and the output is pulled up to the system power supply through a sixth resistor and outputs the received signal to the microcontroller unit.

[0012] As a further embodiment of this invention, the threshold of the comparator circuit is set by the voltage divider circuit. When the voltage at the non-inverting input exceeds the reference level, the comparator circuit outputs a high-level signal; otherwise, it outputs a low-level signal.

[0013] As a further embodiment of this utility model, the filtering unit includes a diode and a third capacitor; the anode of the diode is connected to the DC power line, and the cathode outputs the system power supply; the third capacitor is connected in parallel between the system power supply and ground to filter out pulsating voltage interference on the DC power line.

[0014] As a further embodiment of this invention, the diode is a Schottky diode, used to suppress reverse noise interference to the signal transmitting module and the signal receiving module.

[0015] As a further embodiment of this invention, the signal transmitting module and the signal receiving module share the same DC power line to achieve full-duplex or half-duplex communication.

[0016] Compared with the prior art, the DC power line communication circuit proposed in this utility model has the following advantages:

[0017] This utility model's DC power line communication circuit directly reuses DC power lines to achieve bidirectional data communication, eliminating the need for dedicated communication cables and interface design, thus reducing material costs. It completes the transmission and reception functions through a single power line, reducing wiring complexity and installation costs, making it particularly suitable for cost-sensitive scenarios such as small household appliances.

[0018] In the DC power line communication circuit of this invention, the receiving module adopts a combination of voltage divider circuit and RC low-pass filter to effectively filter out high-frequency noise on the DC power line and effectively reduce the communication error rate; the filter unit isolates power supply noise and avoids the absorption of communication signals by parallel large capacitors, ensuring the integrity of data waveform; the dual N-type MOSFET bootstrap circuit in this invention supports a wide range of DC voltage input and is compatible with different device power systems; the comparator circuit adapts to signal amplitude fluctuations under different load conditions through dynamic threshold setting, improving communication reliability.

[0019] This utility model's DC power line communication circuit adopts a modular design of transmitting, receiving, and filtering units, reducing the number of discrete components and minimizing circuit size, making it suitable for compact devices. The combination of diodes and capacitors optimizes power supply stability, eliminating the need for additional complex filtering networks and simplifying the system architecture. This utility model supports full-duplex / half-duplex communication modes, achieving bidirectional high-speed data transmission through the same power line, meeting the needs of smart home, industrial control, and other scenarios. Circuit parameters are adjustable to adapt to different communication protocols.

[0020] These or other aspects of this application will become more apparent from the following description of embodiments. It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the application. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the accompanying drawings used in the description of the exemplary embodiments or related technologies will be briefly introduced below. The drawings are used to provide a further understanding of this utility model and constitute a part of the specification. They are used together with the embodiments of this utility model to explain this utility model and do not constitute a limitation on this utility model. In the drawings:

[0022] Figure 1 This is a circuit diagram of a DC power line communication circuit according to an embodiment of the present invention. Detailed Implementation

[0023] The present application will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model are further described in detail below with reference to specific examples and the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit this application.

[0025] It should be noted that all uses of the terms "first" and "second" in the embodiments of this utility model are for the purpose of distinguishing two different entities or different parameters with the same name. Therefore, "first" and "second" are merely for convenience of expression and should not be construed as limiting the embodiments of this utility model. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, such as other steps or units inherent in a process, method, system, product, or device that includes a series of steps or units.

[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] The flowchart shown in the attached diagram is for illustrative purposes only and does not necessarily include all content and operations / steps, nor does it necessarily have to be performed in the order described. For example, some operations / steps can be broken down, combined, or partially merged, so the actual execution order may change depending on the actual situation.

[0028] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0029] To address the issue that existing communication circuits require dedicated communication ports and cables, this invention proposes a DC power line communication circuit. This circuit uses a DC power line to achieve data exchange between two devices, eliminating the need for a dedicated communication cable. It enables stable data transmission via a power communication bus, with data transmission and reception completed on the same power line. Furthermore, it reduces material costs and allows for a smaller product size.

[0030] See Figure 1 As shown, an embodiment of this utility model provides a DC power line communication circuit, including a signal transmitting module, a signal receiving module, and a filtering unit. The signal transmitting module is connected to the DC power line VCC1 and is used to load communication data onto the DC power line via a switch control.

[0031] In this embodiment, the signal transmission module includes a dual N-type MOSFET bootstrap circuit. The dual N-type MOSFET bootstrap circuit consists of a first MOSFET Q1, a second MOSFET Q2, a first resistor R5, and a second resistor R6. The gate of the second MOSFET Q2 is connected to the transmit signal terminal TX of the microcontroller unit (MCU) through the second resistor R6, its source is grounded, and its drain is connected to the gate of the first MOSFET Q1. The source of the first MOSFET Q1 is grounded, its drain is connected to the DC power line VCC1, and its gate is connected to the system power supply VCC3 through the first resistor R5. When a pulse signal is input to the transmit signal terminal TX, the second MOSFET Q2 drives the switching state of the first MOSFET Q1, loading communication data onto the DC power line VCC1.

[0032] See Figure 1 As shown, the signal receiving module is connected to the DC power line and is used to extract and identify valid communication data from the DC power line. In this embodiment, the signal receiving module includes a comparator circuit U1, an RC filter circuit, and a voltage divider circuit; the voltage divider circuit is composed of a third resistor R2 and a fourth resistor R3 connected in series, connected between the system power supply VCC3 and ground, and the voltage divider node is grounded through a first capacitor C2 to form a reference level; the RC filter circuit is composed of a fifth resistor R1 and a second capacitor C1, one end of the fifth resistor R1 is connected to the DC power line VCC1, and the other end is connected to the non-inverting input terminal of the comparator circuit U1, and the second capacitor C1 is connected in parallel between the non-inverting input terminal and ground; the inverting input terminal of the comparator circuit U1 is connected to the voltage divider node, and the output terminal is pulled up to the system power supply VCC3 through a sixth resistor R4, and outputs a received signal RX to the microcontroller unit MCU.

[0033] In this embodiment, the threshold of the comparator circuit U1 is set by the voltage divider circuit. When the voltage at the non-inverting input exceeds the reference level, the comparator circuit outputs a high-level signal; otherwise, it outputs a low-level signal.

[0034] See Figure 1 As shown, the filtering unit is connected between the DC power line VCC1 and the system power supply VCC2 to isolate noise from the DC power line and provide a stable system power supply. In this embodiment, the filtering unit includes a diode D1 and a third capacitor C3; the anode of the diode D1 is connected to the DC power line VCC1, and the cathode outputs the system power supply VCC2; the third capacitor C3 is connected in parallel between the system power supply VCC2 and ground to filter out pulsating voltage interference on the DC power line VCC1.

[0035] The diode D1 is a Schottky diode, used to suppress reverse noise interference to the signal transmitting module and the signal receiving module.

[0036] In this embodiment, the signal transmitting module and the signal receiving module share the same DC power line VCC1 to achieve full-duplex or half-duplex communication. This utility model's DC power line communication circuit directly reuses the DC power line to achieve bidirectional data communication, eliminating the need for dedicated communication cables and interface designs, thus reducing material costs. By completing the transmitting and receiving functions with a single power line, it reduces wiring complexity and installation costs, making it particularly suitable for cost-sensitive scenarios such as small household appliances.

[0037] In the DC power line communication circuit of this invention, the receiving module adopts a combination of voltage divider circuit and RC low-pass filter to effectively filter out high-frequency noise on the DC power line and effectively reduce the communication error rate; the filter unit isolates power supply noise and avoids the absorption of communication signals by parallel large capacitors, ensuring the integrity of data waveform; the dual N-type MOSFET bootstrap circuit in this invention supports a wide range of DC voltage input and is compatible with different device power systems; the comparator circuit adapts to signal amplitude fluctuations under different load conditions through dynamic threshold setting, improving communication reliability.

[0038] This utility model's DC power line communication circuit adopts a modular design of transmitting, receiving, and filtering units, reducing the number of discrete components and shrinking the circuit size, making it suitable for compact devices. The combination of diodes and capacitors optimizes power supply stability, eliminating the need for additional complex filtering networks and simplifying the system architecture. This utility model supports full-duplex / half-duplex communication modes, achieving bidirectional high-speed data transmission through the same power line, meeting the needs of smart home, industrial control, and other scenarios. The circuit parameters are adjustable to adapt to different communication protocols.

[0039] The above are exemplary embodiments disclosed in this utility model. However, it should be noted that various changes and modifications can be made without departing from the scope of the embodiments of this utility model as defined by the claims. The functions, steps, and / or actions of the methods according to the disclosed embodiments described herein do not need to be performed in any particular order. Furthermore, although the elements disclosed in the embodiments of this utility model may be described or claimed individually, they may be understood as multiple unless explicitly limited to a singular number.

[0040] It should be understood that, as used herein, the singular form "a" is intended to include the plural form as well, unless the context clearly supports an exception. It should also be understood that, as used herein, "and / or" refers to any and all possible combinations of one or more of the associatedly listed items. The embodiment numbers disclosed above are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0041] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Within the framework of the present invention, technical features of the above embodiments or different embodiments can also be combined, and many other variations of different aspects of the present invention exist, which are not provided in the details for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A DC power line communication circuit, characterized in that, It includes a signal transmitting module, a signal receiving module, and a filtering unit; The signal transmitting module is connected to the DC power line and is used to load communication data onto the DC power line via a switch control; the signal receiving module is connected to the DC power line and is used to extract and identify valid communication data from the DC power line; the filtering unit is connected between the DC power line and the system power supply and is used to isolate noise from the DC power line and provide a stable system power supply.

2. The DC power line communication circuit as described in claim 1, characterized in that, The signal transmitting module includes a dual N-type MOSFET bootstrap circuit; the dual N-type MOSFET bootstrap circuit consists of a first MOSFET, a second MOSFET, a first resistor, and a second resistor; wherein, the gate of the second MOSFET is connected to the transmitting signal terminal of the microcontroller unit through the second resistor, the source is grounded, and the drain is connected to the gate of the first MOSFET; the source of the first MOSFET is grounded, the drain is connected to the DC power line, and the gate is connected to the system power supply through the first resistor; when a pulse signal is input to the transmitting signal terminal, the second MOSFET drives the switching state of the first MOSFET to load communication data onto the DC power line.

3. The DC power line communication circuit as described in claim 2, characterized in that, The signal receiving module includes a comparator circuit, an RC filter circuit, and a voltage divider circuit; The voltage divider circuit consists of a third resistor and a fourth resistor connected in series, connected between the system power supply and ground. The voltage divider node is grounded through the first capacitor to form a reference level. The RC filter circuit consists of a fifth resistor and a second capacitor. One end of the fifth resistor is connected to the DC power line, and the other end is connected to the non-inverting input of the comparator circuit. The second capacitor is connected in parallel between the non-inverting input and ground. The inverting input of the comparator circuit is connected to the voltage divider node, and the output is pulled up to the system power supply through the sixth resistor, and outputs a received signal to the microcontroller unit.

4. The DC power line communication circuit as described in claim 3, characterized in that, The threshold of the comparator circuit is set by the voltage divider circuit. When the voltage at the non-inverting input exceeds the reference level, the comparator circuit outputs a high-level signal; otherwise, it outputs a low-level signal.

5. The DC power line communication circuit as described in claim 4, characterized in that, The filtering unit includes a diode and a third capacitor; the anode of the diode is connected to the DC power line, and the cathode outputs the system power; the third capacitor is connected in parallel between the system power and ground to filter out pulsating voltage interference on the DC power line.

6. The DC power line communication circuit as described in claim 5, characterized in that, The diode is a Schottky diode, used to suppress reverse noise interference to the signal transmitting module and the signal receiving module.

7. The DC power line communication circuit as described in claim 6, characterized in that, The signal transmitting module and the signal receiving module share the same DC power line to achieve full-duplex or half-duplex communication.

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