CN115632555A - An isolated power supply for data transmission and a data isolation transmission method - Google Patents

Abstract

The present invention provides an isolated power supply for data transmission and a data isolation transmission method. The isolated power supply includes: a data encoding controller, a PWM converter, and a data decoder, wherein the output end of the data encoding controller and the PWM converter The input end is connected, the output end of the PWM converter is connected with the input end of the data decoder; the data encoding controller is used to generate the PWM control signal according to the data to be transmitted, and adjust the duty ratio of the PWM control signal according to the preset output voltage; the PWM The converter is used to convert the input voltage into a preset output voltage output according to the PWM control signal; the data decoder is used to collect the preset output voltage, decode the preset output voltage, and restore the data to be transmitted. By implementing the present invention, the number of isolation devices is reduced by multiplexing the PWM converter.

Description

An isolated power supply for data transmission and a data isolated transmission method

technical field

The invention relates to the technical field of drive of turn-off devices, in particular to an isolated power supply for data transmission and a data isolation transmission method.

Background technique

Semiconductor turn-off devices represented by IGBT and MOSFET are the key core components of power electronic power conversion devices, and are widely used in small household appliances, electric vehicles, rail transit, smart grid, aerospace and other fields.

As a signal transmission and implementation carrier, the drive control circuit can automatically receive and convert the signal of the control device, control the turn-on and turn-off of the turn-off device, protect the electronic device, and optimize the performance of the device. The main circuit is used to provide drive power for devices that can be turned off.

In practical applications, the drive control circuit and the main circuit operate independently, and transmit power and data through their respective circuits. However, this circuit structure undoubtedly increases the number of devices used and increases the production cost.

Contents of the invention

Therefore, the technical problem to be solved by the present invention is to overcome the defect of high production cost due to the independent operation of the drive control circuit and the main circuit in the prior art, so as to provide an isolated power supply for data transmission and a data isolation transmission method.

To achieve the above object, the present invention provides the following technical solutions:

In the first aspect, an embodiment of the present invention provides an isolated power supply for data transmission, including: a data encoding controller, a PWM (Pulse Width Modulation, pulse width modulation) converter, and a data decoder, wherein,

The output end of the data encoding controller is connected to the input end of the PWM converter, and the output end of the PWM converter is connected to the input end of the data decoder;

The data encoding controller is used to generate a PWM control signal according to the data to be transmitted, and adjust the duty cycle of the PWM control signal according to a preset output voltage;

The PWM converter is used to convert the input voltage into the preset output voltage output according to the PWM control signal;

The data decoder is used to collect the preset output voltage, perform decoding processing on the preset output voltage, and restore the data to be transmitted.

Optionally, the PWM converter includes: a forward converter or a flyback converter or a push-pull converter or a half-bridge converter or a full-bridge converter.

Optionally, when the PWM converter includes the flyback converter, the flyback converter includes: a flyback transformer, a first switch module, a first capacitor, and a first diode, wherein,

The same-named end of the primary side of the flyback transformer is externally connected to the input voltage, the different-named end of the primary side of the flyback transformer is connected to the first end of the first switch module, and the different-named end of the secondary side of the flyback transformer is The first terminal is connected to one end of the first capacitor through the first diode and outputs the preset output voltage, after the same terminal on the secondary side of the flyback transformer is connected to the other end of the first capacitor grounding;

The control terminal of the first switch module is connected to the output terminal of the data encoding controller, and the second terminal of the first switch module is grounded;

The two ends of the secondary side of the flyback transformer are also connected to the two ends of the data decoder.

Optionally, when the PWM converter includes the push-pull converter, the push-pull converter includes: a three-winding transformer, a second switch module, a third switch module, a second capacitor, and a rectifier bridge, wherein ,

The opposite end of the first winding on the primary side of the three-winding transformer is connected to the first end of the second switch module, the same end of the first winding on the primary side of the three-winding transformer and the second Both the opposite ends of the two windings are connected to an external input voltage, the same end of the second winding on the primary side of the three-winding transformer is connected to the first end of the third switch module, and the same end on the secondary side of the three-winding transformer is connected to the rectifier The first input end of the bridge is connected, the opposite end of the secondary side of the three-winding transformer is connected to the second input end of the rectifier bridge, the first output end of the rectifier bridge is connected to one end of the second capacitor and Outputting the preset output voltage, the second output terminal of the rectifier bridge is connected to the other end of the second capacitor and grounded;

The control end of the second switch module is connected to the first output end of the data encoding controller, and the second end of the second switch module is grounded;

The control terminal of the third switch module is connected to the second output terminal of the data encoding controller, and the second terminal of the third switch module is grounded;

The two ends of the secondary side of the three-winding transformer are also connected to the two ends of the data decoder.

In the second aspect, the embodiment of the present invention provides a data isolation transmission method, which is applied to the isolated power supply for data transmission described in the first aspect of the embodiment of the present invention, and the data isolation transmission method includes:

converting the data to be transmitted into a PWM control signal according to the Manchester encoding rule, and adjusting the duty ratio of the PWM control signal according to a preset output voltage;

converting the input voltage into the preset output voltage output according to the PWM control signal;

The preset output voltage is collected, and the Manchester coding rule is used to decode the preset output voltage to restore the data to be transmitted.

Optionally, each period of the PWM control signal corresponds to each bit of data in the data to be transmitted, and the conversion of the data to be transmitted into a PWM control signal according to the Manchester encoding rule includes:

For the data "0" in the data to be transmitted, change the PWM control signal from high level to low level within the period corresponding to the bit data;

For the data "1" in the data to be transmitted, the PWM control signal is changed from low level to high level within a period corresponding to the bit data.

Optionally, the decoding of the preset output voltage by using the Manchester encoding rule to restore the data to be transmitted includes:

For a cycle in which the preset output voltage changes from high level to low level, restore the preset output voltage to data “0” in the data to be transmitted;

For the cycle in which the preset output voltage changes from low level to high level, restore the preset output voltage to data “1” in the data to be transmitted.

In the third aspect, the embodiments of the present invention provide a computer-readable storage medium, the computer-readable storage medium stores computer instructions, and the computer instructions are used to make the computer execute the method described in the first aspect of the embodiments of the present invention. Data isolation transfer method.

In a fourth aspect, an embodiment of the present invention provides a computer device, including: a memory and a processor, the memory and the processor are connected to each other in communication, the memory stores computer instructions, and the processor executes the The above computer instructions are used to execute the data isolation transmission method described in the first aspect of the embodiment of the present invention.

The technical solution of the present invention has the following advantages:

An isolated power supply for data transmission provided by the present invention includes: a data encoding controller, a PWM converter and a data decoder, wherein the output end of the data encoding controller is connected to the input end of the PWM converter, and the output end of the PWM converter The output terminal is connected to the input terminal of the data decoder; the data encoding controller is used to generate a PWM control signal according to the data to be transmitted, and adjust the duty cycle of the PWM control signal according to the preset output voltage; the PWM converter is used to convert the PWM control signal according to the PWM control signal The input voltage is transformed into a preset output voltage output; the data decoder is used to collect the preset output voltage, decode the preset output voltage, and restore the data to be transmitted. A PWM control signal with an adjustable duty ratio is generated by a data encoding controller, and then a PWM converter is controlled according to the PWM control signal to realize power transmission. At the same time, the data decoder is used to decode the preset output voltage to restore the data to be transmitted. Through the multiplexing of the PWM converter, the synchronous transmission of power and data transmission is realized, and the number of isolation devices is reduced.

A data isolation transmission method provided by the present invention includes: converting the data to be transmitted into a PWM control signal according to Manchester coding rules, and adjusting the duty ratio of the PWM control signal according to a preset output voltage; Convert to a preset output voltage output; collect the preset output voltage, decode the preset output voltage, and restore the data to be transmitted by using the Manchester encoding rule. According to the Manchester encoding rule, a PWM control signal with adjustable duty cycle is generated, and then the PWM converter is controlled according to the PWM control signal to realize the transmission of electric energy. At the same time, the preset output voltage is decoded to restore the data to be transmitted. Through the multiplexing of the PWM converter, the synchronous transmission of power and data transmission is realized, and the number of isolation devices is reduced.

Description of drawings

In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the specific embodiments or prior art. Obviously, the accompanying drawings in the following description The drawings show some implementations of the present invention, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

FIG. 1 is a functional block diagram of a specific example of an isolated power supply for data transmission in an embodiment of the present invention;

Fig. 2 is the data encoding PWM waveform based on Manchester encoding in the embodiment of the present invention;

Fig. 3 is the data isolation power supply of flyback converter topology in the embodiment of the present invention;

Fig. 4 is the key waveform of data transmission under the flyback transformer topology in the embodiment of the present invention;

Fig. 5 is the data isolation power supply of the push-pull converter topology in the embodiment of the present invention;

6 is a key waveform of data transmission under the push-pull converter topology in the embodiment of the present invention;

FIG. 7 is a flowchart of a specific example of a data isolation transmission method in an embodiment of the present invention;

FIG. 8 is a composition diagram of a specific example of computer equipment provided in the present invention.

Reference signs:

1-data encoding controller; 2-PWM converter; 3-data decoder; T1-flyback transformer; Q1-first switch module; C1-first capacitor; D1 first diode; T2-three windings Transformer; Q2-second switch module; Q3-third switch module; C2-second capacitor; DB-rectifier bridge; VIN-input voltage; VOUT-preset output voltage.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation, therefore, should not be construed as limiting the invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically or electrically connected; it can be directly connected, or indirectly connected through an intermediary, or it can be the internal communication of two components, which can be wireless or wired connect. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as there is no conflict with each other.

At present, power isolation is generally unidirectional, that is, power is transmitted from the power input end to the drive end through an isolated converter. Signal isolation requires transferring data such as drive control signals and operating modes from the signal side to the power side. The signal isolation methods mainly adopt optical isolation, capacitive isolation and pulse transformer isolation, all of which are independent of power isolation. This results in the electrical isolation of the control signals from the power section having to be considered.

In order to avoid adding isolation devices, an embodiment of the present invention provides an isolated power supply for data transmission. As shown in Figure 1, comprise: data encoding controller 1, PWM converter 2 and data decoder 3, wherein, the output end of data encoding controller 1 is connected with the input end of PWM converter 2, the PWM converter 2 The output terminal is connected to the input terminal of the data decoder 3 .

In a specific embodiment, the data encoding controller 1 is used to generate a PWM control signal according to the data to be transmitted, and adjust the duty cycle of the PWM control signal according to a preset output voltage. The PWM converter 2 is used to convert the input voltage into a preset output voltage according to the PWM control signal. The data decoder 3 is used to collect the preset output voltage, decode the preset output voltage, and restore the data to be transmitted.

In the embodiment of the present invention, according to the Manchester encoding rule and the required duty cycle of the PWM converter 2, the data encoding controller 1 converts the data to be transmitted into a PWM control signal. Each switching cycle corresponds to 1 bit of data. For data "0", it changes from high level to low level in this cycle; for data "1", it changes from low level to high level in this cycle. Whether it is data "0" or data "1", the proportion of the high level in the period is the duty cycle, as shown in Figure 2. Further, the PWM control signal is a square wave signal with a fixed period, and the time ratio of the high level in the switching period, that is, the duty cycle, is adjusted according to the preset output voltage. In the embodiment of the present invention, the preset output voltage is determined according to the target driving device connected to the main circuit, and the preset output voltage is the driving voltage of the target driving device.

Further, the PWM converter 2 includes a switching tube, an isolation transformer and other passive components, and its output voltage is determined by the PWM control signal of the switching tube. The switch tube can be a fully controlled semiconductor device such as MOSFET, IGBT, SiC, GaN, etc. Specifically, the topology of the PWM converter 2 may be a forward converter, a flyback converter, a push-pull converter, a half-bridge converter, a full-bridge converter, and the like. The power supply can realize power and data transmission by multiplexing the isolation transformer, reducing the number of isolation devices used. Moreover, through the multiplexing of the isolation transformer, power isolation and signal isolation can be realized synchronously, and the problem of large potential difference between the control circuit and the main circuit is solved.

Further, the PWM control signal generated by the data encoding controller 1 controls the switching on and off of the switching tube to realize the transmission of electric energy, and generates a voltage square wave with the same logic on the secondary side of the isolation transformer. The data decoder 3 collects the voltage square wave, decodes it using the Manchester coding rule, restores the transmitted data, and realizes the data transmission.

An isolated power supply for data transmission provided by the present invention includes: a data encoding controller, a PWM converter and a data decoder, wherein the output end of the data encoding controller is connected to the input end of the PWM converter, and the output end of the PWM converter The output terminal is connected to the input terminal of the data decoder; the data encoding controller is used to generate a PWM control signal according to the data to be transmitted, and adjust the duty cycle of the PWM control signal according to the preset output voltage; the PWM converter is used to convert the PWM control signal according to the PWM control signal The input voltage is transformed into a preset output voltage output; the data decoder is used to collect the preset output voltage, decode the preset output voltage, and restore the data to be transmitted. A PWM control signal with an adjustable duty ratio is generated by a data encoding controller, and then a PWM converter is controlled according to the PWM control signal to realize power transmission. At the same time, the data decoder is used to decode the preset output voltage to restore the data to be transmitted. Through the multiplexing of the PWM converter, the synchronous transmission of power and data transmission is realized, and the number of isolation devices is reduced.

In one embodiment, as shown in FIG. 3, when the PWM converter includes a flyback converter, the flyback converter includes: a flyback transformer T1, a first switch module Q1, a first capacitor C1, and a first diode Tube D1.

In a specific embodiment, the same-named terminal of the primary side of the flyback transformer T1 is externally connected to the input voltage VIN, the different-named terminal of the primary side of the flyback transformer T1 is connected to the first terminal of the first switch module Q1, and the terminal of the flyback transformer T1 The opposite end of the secondary side is connected to one end of the first capacitor C1 through the first diode D1 and outputs a preset output voltage VOUT, and the same end of the secondary side of the flyback transformer T1 is connected to the other end of the first capacitor C1 and grounded ; The control terminal of the first switch module Q1 is connected to the output terminal of the data encoding controller 1, and the second terminal of the first switch module Q1 is grounded; end connection.

In the embodiment of the present invention, the first switch module Q1 includes a field effect transistor and a diode connected in antiparallel to the field effect transistor. Wherein, the field effect transistor is an N-channel MOSFET. Specifically, the drain of the FET is connected to the opposite terminal of the primary side of the flyback transformer T1, the gate of the FET is connected to the output terminal of the data encoding controller 1, and the source of the FET is grounded.

Further, the data encoding controller 1 generates a PWM control signal from the data to be transmitted according to the Manchester encoding rule and duty cycle, and sends it to the gate of the first switch module Q1 to control its turn-on and turn-off. The primary side of the flyback transformer T1 generates a voltage waveform inverse to the PWM control signal. According to the terminal with the same name of the flyback transformer T1 and the characteristics of the flyback transformer T1, the voltage waveform on the secondary side of the flyback transformer T1 is opposite to the phase of the primary side, that is, in phase with the PWM control signal. The data decoder 3 performs decoding by detecting the high and low level logic of the secondary side voltage waveform of the flyback transformer T1. The duty cycle depends on the input and output voltages and can be adjusted without affecting the accuracy of data transmission. The key waveforms are shown in Figure 4. In the embodiment of the present invention, by multiplexing the flyback transformer T1, power and data transmission can be realized, the number of isolation devices used is reduced, and the production cost is reduced.

In one embodiment, as shown in FIG. 5, when the PWM converter includes a push-pull converter, the push-pull converter includes: a three-winding transformer T2, a second switch module Q2, a third switch module Q3, a second capacitor C2 and rectifier bridge DB.

In a specific embodiment, as shown in FIG. 5 , the opposite end of the first winding on the primary side of the three-winding transformer T2 is connected to the first end of the second switch module Q2, and the same end of the first winding on the primary side of the three-winding transformer T2 And the different-named end of the second winding on the primary side of the three-winding transformer T2 is externally connected to the input voltage VIN, the same-named end of the second winding on the primary side of the three-winding transformer T2 is connected to the first end of the third switch module Q3, and the secondary side of the three-winding transformer T2 The same-name end of the side is connected to the first input end of the rectifier bridge DB, the opposite-name end of the secondary side of the three-winding transformer T2 is connected to the second input end of the rectifier bridge DB, and the first output end of the rectifier bridge DB is connected to one end of the second capacitor C2 Connect and output the preset output voltage VOUT, the second output end of the rectifier bridge DB is connected to the other end of the second capacitor C2 and then grounded; the control end of the second switch module Q2 is connected to the first output end of the data encoding controller 1, The second terminal of the second switch module Q2 is grounded; the control terminal of the third switch module Q3 is connected to the second output terminal of the data encoding controller 1, and the second terminal of the third switch module Q3 is grounded; the secondary side of the three-winding transformer T2 The two ends of the side are also connected with the two ends of the data decoder 3.

In the embodiment of the present invention, the rectifier bridge DB is composed of 4 diodes. Both the second switch module Q2 and the third switch module Q3 include field effect transistors and diodes connected in antiparallel to the field effect transistors. Wherein, the field effect transistor is an N-channel MOSFET. Specifically, the drain of the field effect transistor of the second switch module Q2 is connected to the opposite end of the first winding on the primary side of the three-winding transformer T2, its gate is connected to the first output end of the data encoding controller 1, and its source grounded. The drain of the field effect transistor of the third switch module Q3 is connected to the same terminal of the second primary winding of the three-winding transformer T2, its gate is connected to the second output terminal of the data encoding controller 1, and its source is grounded.

Further, the data encoding controller 1 provides PWM control signals for the second switch module Q2 and the third switch module Q3, the two PWM control signals are both 50% duty cycle, and the two control signals are complementary. According to the setting of the terminal with the same name of the three-winding transformer T2 in Fig. 5, its secondary side voltage waveform is in the same phase as the driving signal of the second switch module Q2, so the data encoding controller 1 sends the data-encoded PWM control signal to the second switch module Q2, and send the inverted signal to the third switch module Q3. The data decoder 3 collects the secondary side voltage of the three-winding transformer T2, and performs logical processing on the waveform to restore the original data. The key waveforms are shown in Figure 6. In the embodiment of the present invention, power and data transmission can be realized by multiplexing the three-winding transformer T2.

An embodiment of the present invention provides a data isolation transmission method, which is applied to the above-mentioned isolated power supply for data transmission. As shown in Figure 7, the data isolation transmission method includes the following steps:

Step S1: Convert the data to be transmitted into a PWM control signal according to the Manchester encoding rule, and adjust the duty ratio of the PWM control signal according to a preset output voltage.

Step S2: Transform the input voltage into a preset output voltage according to the PWM control signal.

Step S3: Collect the preset output voltage, decode the preset output voltage by using the Manchester encoding rule, and restore the data to be transmitted.

In a specific embodiment, according to the Manchester encoding rule and the required duty cycle of the PWM converter 2, the data encoding controller 1 converts the data to be transmitted into a PWM control signal. Each period of the PWM control signal corresponds to each bit of data in the data to be transmitted. For the data "0" in the data to be transmitted, the PWM control signal is changed from high level to high level in the period corresponding to the bit data. Low level; for the data "1" in the data to be transmitted, the PWM control signal is changed from low level to high level within the period corresponding to the bit data. Whether it is data "0" or data "1", the proportion of the high level in the period is the duty cycle, as shown in Figure 2. Further, the PWM control signal is a square wave signal with a fixed period, and the time ratio of the high level in the switching period, that is, the duty cycle, is adjusted according to the preset output voltage.

Further, the PWM control signal generated by the data encoding controller 1 realizes the transmission of electric energy by controlling the switching on and off of the switching tube in the PWM converter 2, and generates the voltage of the same logic by controlling the secondary side of the isolation transformer in the PWM converter 2. Wave. The data decoder 3 collects the voltage square wave, decodes it using the Manchester coding rule, restores the transmitted data, and realizes the data transmission.

Specifically, when the data decoder 3 uses the Manchester encoding rule to decode and restore the transmitted data, for the period in which the preset output voltage changes from high level to low level, the preset output voltage is restored to the data to be transmitted The data "0" in the data; for the period when the preset output voltage changes from low level to high level, restore the preset output voltage to the data "1" in the data to be transmitted.

A data isolation transmission method provided by the present invention includes: converting the data to be transmitted into a PWM control signal according to Manchester encoding rules, and adjusting the duty ratio of the PWM control signal according to a preset output voltage; converting the input voltage according to the PWM control signal It is the preset output voltage output; the preset output voltage is collected, and the preset output voltage is decoded by using the Manchester encoding rule to restore the data to be transmitted. According to the Manchester encoding rule, a PWM control signal with adjustable duty cycle is generated, and then the PWM converter is controlled according to the PWM control signal to realize the transmission of electric energy. At the same time, the preset output voltage is decoded to restore the data to be transmitted. Through the multiplexing of the PWM converter, the synchronous transmission of power and data transmission is realized, and the number of isolation devices is reduced.

An embodiment of the present invention provides a computer device. As shown in FIG. 8, the device may include a processor 81 and a memory 82, wherein the processor 81 and the memory 82 may be connected through a bus or in other ways. FIG. 8 takes connection through a bus as an example .

The processor 81 may be a central processing unit (Central Processing Unit, CPU). Processor 81 can also be other general processors, digital signal processor (Digital Signal Processor, DSP), application specific integrated circuit (Application Specific Integrated Circuit, ASIC), field programmable gate array (Field-Programmable Gate Array, FPGA) or Other chips such as programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or combinations of the above-mentioned types of chips.

The memory 82, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer-executable programs and modules, such as corresponding program instructions/modules in the embodiments of the present invention. The processor 81 executes various functional applications and data processing of the processor by running the non-transitory software programs, instructions and modules stored in the memory 82, that is, implements the data isolation transmission method in the above method embodiments.

The memory 82 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application program required by at least one function; the data storage area may store data created by the processor 81 and the like. In addition, the memory 82 may include a high-speed random access memory, and may also include a non-transitory memory, such as at least one magnetic disk storage device, a flash memory device, or other non-transitory solid-state storage devices. In some embodiments, the memory 82 may optionally include a memory that is remotely located relative to the processor 81, and these remote memories may be connected to the processor 81 through a network. Examples of the aforementioned networks include, but are not limited to, the Internet, corporate intranets, corporate intranets, mobile communication networks, and combinations thereof.

One or more modules are stored in the memory 82, and when executed by the processor 81, the data isolation transmission method in the embodiment shown in FIG. 7 is executed.

The specific details of the above computer equipment can be understood by correspondingly referring to the corresponding descriptions and effects in the embodiments shown in FIGS. 1-7 , and will not be repeated here.

Those skilled in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented through computer programs to instruct related hardware, and the programs can be stored in a computer-readable storage medium. , may include the flow of the embodiments of the above-mentioned methods. Wherein, the storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a flash memory (Flash Memory), a hard disk (Hard Disk Drive) , abbreviation: HDD) or a solid-state drive (Solid-State Drive, SSD), etc.; the storage medium may also include a combination of the above-mentioned types of memories.

Apparently, the above-mentioned embodiments are only examples for clear description, rather than limiting the implementation. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. However, the obvious changes or changes derived therefrom are still within the scope of protection of the present invention.

Claims (9)

1. An isolated power supply for data transmission, comprising: a data encoding controller, a PWM converter, and a data decoder, wherein,

the output end of the data coding controller is connected with the input end of the PWM converter, and the output end of the PWM converter is connected with the input end of the data decoder;

the data coding controller is used for generating a PWM control signal according to data to be transmitted and adjusting the duty ratio of the PWM control signal according to a preset output voltage;

the PWM converter is used for converting an input voltage into the preset output voltage according to the PWM control signal and outputting the preset output voltage;

the data decoder is used for collecting the preset output voltage, decoding the preset output voltage and restoring the data to be transmitted.

2. The isolated power supply for data transmission according to claim 1, wherein the PWM converter comprises: a forward converter or a flyback converter or a push-pull converter or a half-bridge converter or a full-bridge converter.

3. The isolated power supply for data transmission according to claim 2, wherein when the PWM converter comprises the flyback converter, the flyback converter comprises: a flyback transformer, a first switch module, a first capacitor and a first diode, wherein,

the primary side dotted terminal of the flyback transformer is externally connected with an input voltage, the primary side dotted terminal of the flyback transformer is connected with the first end of the first switch module, the secondary side dotted terminal of the flyback transformer is connected with one end of the first capacitor through the first diode and outputs the preset output voltage, and the secondary side dotted terminal of the flyback transformer is connected with the other end of the first capacitor and then grounded;

the control end of the first switch module is connected with the output end of the data coding controller, and the second end of the first switch module is grounded;

and the two ends of the secondary side of the flyback transformer are also connected with the two ends of the data decoder.

4. The isolated power supply for data transmission according to claim 2, wherein when the PWM converter comprises the push-pull converter, the push-pull converter comprises: a three-winding transformer, a second switch module, a third switch module, a second capacitor and a rectifier bridge, wherein,

the primary side first winding synonym end of the three-winding transformer is connected with a first end of the second switch module, the primary side first winding synonym end of the three-winding transformer and the primary side second winding synonym end of the three-winding transformer are externally connected with input voltage, the primary side second winding synonym end of the three-winding transformer is connected with a first end of the third switch module, the secondary side synonym end of the three-winding transformer is connected with a first input end of the rectifier bridge, the secondary side synonym end of the three-winding transformer is connected with a second input end of the rectifier bridge, a first output end of the rectifier bridge is connected with one end of the second capacitor and outputs the preset output voltage, and a second output end of the rectifier bridge is connected with the other end of the second capacitor and then grounded;

the control end of the second switch module is connected with the first output end of the data coding controller, and the second end of the second switch module is grounded;

the control end of the third switch module is connected with the second output end of the data coding controller, and the second end of the third switch module is grounded;

and the two ends of the secondary side of the three-winding transformer are also connected with the two ends of the data decoder.

5. A data isolation transmission method, wherein the data isolation transmission method is applied to the isolation power supply for data transmission according to any one of claims 1 to 4, and the data isolation transmission method comprises the following steps:

converting data to be transmitted into PWM control signals according to a Manchester encoding rule, and adjusting the duty ratio of the PWM control signals according to preset output voltage;

converting the input voltage into the preset output voltage according to the PWM control signal and outputting the preset output voltage;

and collecting the preset output voltage, decoding the preset output voltage by using the Manchester encoding rule, and restoring the data to be transmitted.

6. The data isolation transmission method according to claim 5, wherein each period of the PWM control signal corresponds to each bit of data in the data to be transmitted, and the converting of the data to be transmitted into the PWM control signal according to the Manchester encoding rule comprises:

for data 0 in the data to be transmitted, changing the PWM control signal from high level to low level in a period corresponding to the data;

and for data 1 in the data to be transmitted, changing the PWM control signal from low level to high level in a period corresponding to the data.

7. The method for isolated transmission of data according to claim 6, wherein the decoding the preset output voltage by using the Manchester encoding rule to restore the data to be transmitted comprises:

for the period that the preset output voltage is changed from a high level to a low level, restoring the preset output voltage to be data '0' in the data to be transmitted;

and for the period that the preset output voltage is changed from low level to high level, restoring the preset output voltage to be data '1' in the data to be transmitted.

8. A computer-readable storage medium having stored thereon computer instructions for causing the computer to perform the method for isolated transmission of data according to any of claims 5-7.

9. A computer device, comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the computer instructions to perform the data isolation transmission method according to any one of claims 5 to 7.

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