A circuit for one-to-many communication using a DC power supply system

Abstract

A circuit for one-to-many communication using a DC power supply system, comprising a DC power supply V1, a DC power supply V2, a diode D1, an electronic switch K1, a communication signal source for controlling the on and off of the electronic switch K1, and at least one load, wherein the negative electrode of the DC power supply V1 and the negative electrode of the DC power supply V2 are connected in parallel to the negative input terminal for the load. The present invention has a simple structure and strong practicality, wherein a DC power supply V1, a DC power supply V2 and a diode D1 are provided, and an electronic switch K1 is introduced for control, and while supplying power to the device, the device also has a communication function, i.e., power supply and communication are integrated, and independent communication lines and interfaces are not required, and the total number of connecting wires is reduced to a minimum, thus simplifying wiring requirements, improving installation convenience and maintainability, and also greatly improving device reliability.

Description

Technical Field

[0001] The invention relates to a circuit capable of simultaneously performing power supply and signal transmission, and in particular to a circuit for performing one-to-many communication using a direct current power supply system. Background Art

[0002] At present, many industrial control equipment need power supply and communication functions. The power supply generally adopts DC power supply. In industrial occasions, it is between +24V and +36V, and 24V is commonly used. There are many forms of communication, and the commonly used ones are RS232, RS485, CAN, etc., and they often appear in the form of master-slave, that is, 1 host and several slaves are connected together through communication cables and star and series methods for communication. The power supply usually consists of two wires with positive and negative poles to power the equipment, while the communication line consists of several wires and is connected between various devices through various interfaces to complete various functions such as control and data transmission. From the perspective of connection and circuit structure, the two are separate.

[0003] At present, the existing technology is to make power supply and communication independent of each other, which is not a problem in most cases, but it is not applicable under some special conditions of use.

[0004] 1: When the device itself is a super-miniaturized device, due to the requirements of the use environment, not only is the size of the device limited, but the installation space is also very limited. Therefore, it is impossible to use interfaces with good reliability but large size, and only some small or simple interfaces can be used. Due to the limitation of the installation space, it is also impossible to accommodate too many connecting wires, especially when there are dozens or hundreds of devices that need to communicate, the installation, wiring, maintenance and other tasks will be very difficult and tricky.

[0005] 2: The equipment is installed on a component that moves back and forth quickly. Due to the movement of the component, the connection interface and contacts of the equipment will be vibrated and impacted. If it works in this condition for a long time, the interface itself or the wire connection will fall off or have poor contact, which will seriously affect the reliability of the equipment. The more wires there are, the more prominent the above problems will be, and the overall operation efficiency of the equipment will be low.

[0006] In view of the above situation, in applications requiring one-to-many communication, it is required to reduce the number of interfaces and wires as much as possible to meet the requirements of equipment size, installation space, reliability, and ease of maintenance. Summary of the invention

[0007] The present invention provides a circuit for one-to-many communication using a direct current power supply system, the main purpose of which is to overcome the defects of complex circuits and poor operating reliability in existing independent power supply and communication systems.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0009] A circuit for one-to-many communication using a DC power supply system, comprising a DC power supply V1, a DC power supply V2, a diode D1, an electronic switch K1, a communication signal source for controlling the on and off of the electronic switch K1, and at least one load, wherein the negative electrode of the DC power supply V1 and the negative electrode of the DC power supply V2 are connected in parallel to the negative input terminal of the load, the voltage of the DC power supply V1 is greater than the voltage of the DC power supply V2, one end of the electronic switch K1 is connected to the positive electrode of the DC power supply V1, the other end of the electronic switch K1 and the cathode of the diode D1 are connected in parallel to the positive input terminal of the load, and the anode of the diode D1 is connected to the positive electrode of the DC power supply V2.

[0010] Furthermore, each load is provided with a low-pass filter and / or a high-pass filter for separating the power supply and the communication signal.

[0011] Further, the electronic switch K includes a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a transistor Q2, a transistor Q3, a transistor Q4, a transistor Q5, a MOS transistor Q1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a Zener diode ZD1 and a diode D2; one side of the capacitor C1, the capacitor C2 and the capacitor C3 is connected to the ground in parallel, and the other side is connected in parallel to the positive electrode of the DC power supply V1; the cathode of the Zener diode ZD1, one end of the resistor R2, the emitter of the transistor Q2 and the source of the MOS transistor Q1 are connected in parallel to the positive electrode of the DC power supply V1; the anode of the Zener diode ZD1, the other end of the resistor R2, one end of the resistor R3 and the base of the transistor Q4 are connected in parallel to the positive electrode of the transistor Q 3; the emitter of the transistor Q3, the emitter of the transistor Q4 and the collector of the transistor Q2 are connected in parallel to the gate of the MOS tube Q1; one end of the resistor R1 is connected to the collector of the transistor Q3, and the other end is connected to the base of the transistor Q2; the other end of the resistor R3 is connected to the collector of the transistor Q5; the collector of the transistor Q4, the emitter of the transistor Q5 and the anode of the diode D2 are connected to the ground in parallel; one end of the resistor R4, one side of the capacitor C4 and the cathode of the diode D2 are connected in parallel to the base of the transistor Q5; the other end of the resistor R4 and the other side of the capacitor C4 are connected in parallel to the input end of the communication signal source; the drain of the MOS tube Q1 and the cathode of the diode D1 are connected in parallel to the positive input end of the load.

[0012] Furthermore, the MOS transistor Q1 is a P-channel MOS transistor.

[0013] Furthermore, the transistor Q2 and the transistor Q4 are PNP transistors.

[0014] Furthermore, the transistor Q5 and the transistor Q3 are NPN transistors.

[0015] Compared with the prior art, the beneficial effects produced by the present invention are:

[0016] The present invention has a simple structure and strong practicality. A DC power supply V1, a DC power supply V2 and a diode D1 are provided, and an electronic switch K1 is introduced for control. While supplying power to the device, the present invention also has a communication function, that is, power supply and communication are integrated. No independent communication lines and interfaces are required, the total number of connecting wires is reduced to a minimum, wiring requirements are simplified, installation convenience and maintainability are improved, and equipment reliability is also greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a principle block diagram of the present invention.

[0019] Figure 2 It is a circuit diagram of the present invention.

[0020] Figure 3 It is the working waveform diagram of the present invention. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Reference Figure 1 , Figure 2 and Figure 3A circuit for one-to-many communication using a DC power supply system, comprising a DC power supply V1, a DC power supply V2, a diode D1, an electronic switch K1, a communication signal source for controlling the on and off of the electronic switch K1, and at least one load, wherein the negative electrode of the DC power supply V1 and the negative electrode of the DC power supply V2 are connected in parallel to the negative input terminal of the load, the voltage of the DC power supply V1 is greater than the voltage of the DC power supply V2, one end of the electronic switch K1 is connected to the positive electrode of the DC power supply V1, the other end of the electronic switch K1 and the cathode of the diode D1 are connected in parallel to the positive input terminal of the load, and the anode of the diode D1 is connected to the positive electrode of the DC power supply V2.

[0023] Reference Figure 1 , Figure 2 and Figure 3 Each load is provided with a low-pass filter and / or a high-pass filter for separating the power supply and the communication signal.

[0024] Reference Figure 1 , Figure 2 and Figure 3The electronic switch K includes capacitor C1, capacitor C2, capacitor C3, capacitor C4, transistor Q2, transistor Q3, transistor Q4, transistor Q5, MOS transistor Q1, resistor R1, resistor R2, resistor R3, resistor R4, Zener diode ZD1 and diode D2; one side of capacitor C1, capacitor C2 and capacitor C3 are connected to the ground in parallel, and the other side is connected in parallel to the positive electrode of the DC power supply V1; the cathode of Zener diode ZD1, one end of resistor R2, the emitter of transistor Q2 and the source of MOS transistor Q1 are connected in parallel to the positive electrode of the DC power supply V1; the anode of Zener diode ZD1, the other end of resistor R2, one end of resistor R3 and the base of transistor Q4 are connected in parallel to the positive electrode of transistor Q3 base; the emitter of the transistor Q3, the emitter of the transistor Q4 and the collector of the transistor Q2 are connected in parallel to the gate of the MOS tube Q1; one end of the resistor R1 is connected to the collector of the transistor Q3, and the other end is connected to the base of the transistor Q2; the other end of the resistor R3 is connected to the collector of the transistor Q5; the collector of the transistor Q4, the emitter of the transistor Q5 and the anode of the diode D2 are connected to the ground in parallel; one end of the resistor R4, one side of the capacitor C4 and the cathode of the diode D2 are connected in parallel to the base of the transistor Q5; the other end of the resistor R4 and the other side of the capacitor C4 are connected in parallel to the input end of the communication signal source; the drain of the MOS tube Q1 and the cathode of the diode D1 are connected in parallel to the positive input end of the load. The above power supply device includes two power supplies, a DC power supply V1 and a DC power supply V2. Comparing the voltages, the DC power supply V1>DC power supply V2, wherein the negative poles of the DC power supply V1 and the DC power supply V2 are connected together to form the negative pole of the output power supply, and the positive pole of the DC power supply V1 is output to the positive pole of the power supply through the electronic switch K1. The electronic switch K1 can be composed of a high-power semiconductor device, such as a transistor, MOS or IGBT. The positive pole of the DC power supply V2 is output to the positive pole of the power supply through a diode D1. In this embodiment, the communication signal itself is a series of binary signals, and controls the electronic switch K1. The 0 state in the communication signal corresponds to the electronic switch K1 being disconnected; the 1 state corresponds to the electronic switch K1 being closed. The working process of the above power supply device includes the following: 1. By Figure 3It can be seen that at any time, there will always be voltage at the positive pole of the input power supply. When the electronic switch K1 is closed, since the DC power supply V1>DC power supply V2, the diode D1 is reverse biased and cut off, and the output voltage = V1; when the electronic switch K1 is disconnected, the diode D1 is immediately forward biased, and the voltage drop of the diode D1 is ignored. At this time, the output voltage = V2; since the electronic switch K1 is controlled by the communication signal source, when there is communication, the communication signal is modulated on the positive pole of the output power supply to form a communication signal, and the 0 state controls the electronic switch K1 to disconnect, so it corresponds to the output DC power supply V2, and the 1 state controls the electronic switch K1 to close, so it corresponds to the output DC power supply V1. And because this signal itself is the power supply, it has a strong load-carrying capacity. The DC power supply V1 and the DC power supply V2 correspond to the maximum and minimum values ​​of the allowable fluctuation range of the load supply voltage to ensure the power supply of the load. The working waveforms of each point of this power supply device are as follows Figure 3 As shown in the waveform diagram, it can be seen that the 0 state of the communication signal is modulated into V2, and the 1 state is modulated into V1. While completing the communication signal transmission, it is also a power supply with a voltage range of V2~V1. From the above, it can be seen that by setting up DC power supply V1, DC power supply V2 and diode D1, and introducing electronic switch K1 for control, while powering the equipment, it also has the communication function, that is, power supply and communication are integrated, no independent communication lines and interfaces are required, the total number of connecting wires is reduced to a minimum, the wiring requirements are simplified, the installation convenience and maintainability are improved, and the reliability of the equipment is also greatly improved.

[0025] Reference Figure 1 , Figure 2 and Figure 3 . Among them, MOS tube Q1 is a P-channel MOS tube. Among them, transistor Q2 and transistor Q4 are PNP transistors. Among them, transistor Q5 and transistor Q3 are NPN transistors. The working principle of the above circuit includes the following: 1. Capacitor C1, capacitor C2, and capacitor C3 form a power supply filter circuit. 2. INPUT is the communication signal input terminal. The drive circuit is composed of transistor Q2, transistor Q3, transistor Q4, transistor Q5, resistor R1, resistor R3, resistor R4, capacitor C4, and diode D2. The clamping circuit is composed of resistor R2 and Zener diode ZD1. MOS tube Q1 is a P-channel MOS, used as an analog switch.

[0026] The working process of the above circuit includes the following: 1. Assume that at the beginning, the input level of INPUT is 0, and the DC power supply V1>DC power supply V2. Transistor Q5 is cut off. Due to the reverse bias of diode D1, the potential at point A = V1, and the potential at point B is ignored when the forward voltage drop of the base of transistor Q3 is ignored. MOS tube Q1 is a P-channel MOS, so MOS tube Q1 is cut off at this time. 2. When there is a signal input to INPUT, that is, the level is 1, the signal is first injected into the base of transistor Q5 through capacitor C4. Since there is no voltage on capacitor C4 at the beginning, it is equivalent to a short circuit. In a short time, the base of transistor Q5 will have a relatively large driving current, and transistor Q5 will turn on sharply. When capacitor C4 is charged, resistor R4 continues to provide conduction current. Therefore, the function of capacitor C4 is to accelerate the conduction of transistor Q5. Resistor R3 is a current limiting resistor, resistor R2 is a discharge resistor, and Zener diode ZD1 is an embedded diode. Due to the existence of Zener diode ZD1, the voltage between the source and gate of MOS tube Q1 is constant, that is, the driving voltage is constant, to prevent the DC power supply V1 voltage from breaking through the gate of MOS tube Q1 when it is higher than the gate withstand voltage of MOS tube Q1, causing damage to MOS tube Q1. 3. After transistor Q5 is turned on, the voltage between the source and gate of MOS tube Q1 = Vzd1, so MOS tube Q1 is turned on at this time. The function of transistor Q4 is to accelerate the release of the charge of the gate of MOS tube Q1 and accelerate the conduction of MOS tube Q1. Therefore, when INPUT=1, MOS tube Q1 is turned on. Since DC power supply V1>DC power supply V2, diode D1 is reverse biased, so V_OUT=V1. 4. When INPUT changes from 1 to 0, the charge stored on capacitor C4 is released through diode D2, and a reverse bias voltage is formed between the emitter and base of transistor Q5. Transistor Q5 is quickly cut off, which is equivalent to an open circuit. At this time, the potential at point A rises rapidly. The role of resistor R2 is to provide a discharge loop for the capacitor between the source and gate of MOS tube Q1 to prevent MOS tube Q1 from being in the on state due to the clamping effect of Zener diode ZD1. When the potential at point A rises to close to DC power supply V1, MOS tube Q1 is cut off, diode D1 is forward biased, so V_OUT=V2. In summary, from the above analysis, it can be seen that the V_OUT output voltage is controlled by the INPUT input level. INPUT=0, V_OUT=V2; INPUT=1, V_OUT=V1.

[0027] The above is a detailed introduction to a circuit for one-to-many communication using a DC power supply system provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A circuit for one-to-many communication using a DC power supply system, characterized in that: The invention comprises a DC power supply V1, a DC power supply V2, a diode D1, an electronic switch K1, a communication signal source for controlling the on and off of the electronic switch K1, and at least one load, wherein the negative electrode of the DC power supply V1 and the negative electrode of the DC power supply V2 are connected in parallel to the negative input terminal of the load, the voltage of the DC power supply V1 is greater than the voltage of the DC power supply V2, one end of the electronic switch K1 is connected to the positive electrode of the DC power supply V1, the other end of the electronic switch K1 and the cathode of the diode D1 are connected in parallel to the positive input terminal of the load, and the anode of the diode D1 is connected to the positive electrode of the DC power supply V2. The electronic switch K comprises a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a transistor Q2, a transistor Q3, a transistor Q4, a transistor Q5, a MOS transistor Q1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a Zener diode ZD1 and a diode D2; one side of the capacitor C1, the capacitor C2 and the capacitor C3 are connected to the ground in parallel, and the other side is connected in parallel to the positive electrode of the DC power supply V1; the cathode of the Zener diode ZD1, one end of the resistor R2, the emitter of the transistor Q2 and the source of the MOS transistor Q1 are connected in parallel to the positive electrode of the DC power supply V1; the anode of the Zener diode ZD1, the other end of the resistor R2, one end of the resistor R3 and the base of the transistor Q4 are connected in parallel to the positive electrode of the transistor Q3. base; the emitter of transistor Q3, the emitter of transistor Q4 and the collector of transistor Q2 are connected in parallel to the gate of MOS tube Q1; one end of resistor R1 is connected to the collector of transistor Q3, and the other end is connected to the base of transistor Q2; the other end of resistor R3 is connected to the collector of transistor Q5; the collector of transistor Q4, the emitter of transistor Q5 and the anode of diode D2 are connected to ground in parallel; one end of resistor R4, one side of capacitor C4 and the cathode of diode D2 are connected in parallel to the base of transistor Q5; the other end of resistor R4 and the other side of capacitor C4 are connected in parallel to the input end of communication signal source; the drain of MOS tube Q1 and the cathode of diode D1 are connected in parallel to the positive input end of load, and the communication signal of communication signal source is binary signal.

2. A circuit for one-to-many communication using a DC power supply system as claimed in claim 1, characterized in that: Each load is provided with a low-pass filter and / or a high-pass filter for separating the power supply and the communication signal.

3. A circuit for performing one-to-many communication using a DC power supply system as claimed in claim 2, characterized in that: The MOS tube Q1 is a P-channel MOS tube.

4. A circuit for performing one-to-many communication using a DC power supply system as claimed in claim 2, characterized in that: Among them, transistor Q2 and transistor Q4 are PNP transistors.

5. A circuit for performing one-to-many communication using a DC power supply system as claimed in claim 2, characterized in that: Among them, transistor Q5 and transistor Q3 are NPN transistors.

Images