阅读说明：本技术 一种基于lxi总线的多信号交流试验程控电源装置 (Multi-signal alternating-current test program-controlled power supply device based on LXI bus ) 是由 赵爱明 徐笑笑 叶伟民 石亚威 于 2021-07-27 设计创作，主要内容包括：本发明涉及一种基于LXI总线的多信号交流试验程控电源装置,包括差分对称半桥模块、共轭滤波模块、驱动隔离模块、控制器、对称采样反馈模块和LAN通信显示模块,差分对称半桥模块用于将输入的直流信号逆变输出为相位相差180°、频率幅值相等的两路交流信号；共轭滤波模块用于对两路交流信号进行滤波,以得到差分输出电压；对称采样反馈模块用于采集差分输出电压的瞬时值；控制器用于处理对称采样反馈模块采集的数据,以及输出实时控制波形,并通过驱动隔离模块传输给差分对称半桥模块；LAN通信显示模块用于实现控制器对数据的实时监测以及远程控制。与现有技术相比,本发明能够消除共模干扰,能够精准、有效地调节输出稳定电压。(The invention relates to a multi-signal alternating current test program-controlled power supply device based on an LXI bus, which comprises a differential symmetrical half-bridge module, a conjugate filter module, a drive isolation module, a controller, a symmetrical sampling feedback module and an LAN communication display module, wherein the differential symmetrical half-bridge module is used for inverting and outputting an input direct current signal into two paths of alternating current signals with phase difference of 180 degrees and equal frequency amplitude; the conjugate filtering module is used for filtering the two paths of alternating current signals to obtain differential output voltage; the symmetrical sampling feedback module is used for collecting instantaneous values of the differential output voltage; the controller is used for processing the data acquired by the symmetrical sampling feedback module, outputting a real-time control waveform and transmitting the real-time control waveform to the differential symmetrical half-bridge module through the driving isolation module; the LAN communication display module is used for realizing real-time monitoring and remote control of the controller on data. Compared with the prior art, the invention can eliminate common mode interference and accurately and effectively regulate output stable voltage.)

1. The utility model provides a many signals exchange test programme-controlled power supply unit based on LXI bus, its characterized in that, including difference symmetry half-bridge module (1), conjugate filter module (2), drive isolation module (3), controller (4), symmetry sampling feedback module (5) and LAN communication display module (6), the input of difference symmetry half-bridge module (1) is direct current signal, difference symmetry half-bridge module (1) is connected with controller (4) through drive isolation module (3), the output and the conjugate filter module (2) of difference symmetry half-bridge module (1) are connected, conjugate filter module (2) are connected with controller (4) through symmetry sampling feedback module (5), controller (4) still are connected with LAN communication display module (6), difference half-bridge symmetry module (1) is used for outputting direct current signal contravariant as 180 degrees of phase difference, Two paths of alternating current signals with equal frequency and amplitude;

the conjugate filtering module (2) is used for filtering two paths of alternating current signals to obtain differential output voltage;

the symmetrical sampling feedback module (5) is used for collecting instantaneous values of differential output voltage;

the controller (4) is used for processing the data acquired by the symmetrical sampling feedback module (5) and outputting a real-time control waveform;

the LAN communication display module (6) is used for realizing real-time monitoring and remote control of the controller (4) on data.

2. The multi-signal alternating-current test program-controlled power supply device based on the LXI bus is characterized in that the differential symmetrical half-bridge module (1) comprises a first chopping unit and a second chopping unit which are symmetrical to each other, and the input ends of the first chopping unit and the second chopping unit are connected to the controller (4).

3. The LXI-bus-based multi-signal alternating current test program-controlled power supply device is characterized in that the real-time control waveforms output by the controller (4) comprise SPWM control waveforms and fault simulation signal waveforms, wherein the SPWM control waveforms are generated through PWM modulation according to sinusoidal signals; the fault analog signal waveform is generated through PWM modulation according to the analog fault waveform based on a digital signal synthesis technology.

4. The LXI bus-based multi-signal ac test program controlled power supply device of claim 1, wherein said instantaneous values of said differential output voltage comprise the frequency and amplitude of voltage and current.

5. The LXI bus-based multi-signal alternating current test program-controlled power supply device is characterized in that the symmetrical sampling feedback module (5) comprises a Hall sensor for collecting voltage and current data.

6. The LXI bus-based multi-signal ac test program-controlled power supply device according to claim 1, wherein said controller (4) comprises an RT1050 chip.

7. The LXI bus-based multi-signal alternating current test program-controlled power supply device is characterized in that the controller (4) is connected with the LAN communication display module (6) through an Ethernet interface module.

8. The LXI bus-based multi-signal ac test program-controlled power supply device according to claim 7, wherein said ethernet interface module comprises a MAC and a PHY, said MAC is integrated into said controller (4), and said MAC is connected to said PHY and said ethernet connector via MII/RMII standard interfaces.

9. The LXI bus-based multi-signal AC test program-controlled power supply device of claim 8, wherein the MII/RMII standard interface is provided by a KSZ8081RNBIA chip.

10. The LXI bus-based multi-signal AC test program-controlled power supply device of claim 8, wherein the Ethernet connector is HR 911105A.

Technical Field

The invention relates to the technical field of field test alternating current power supplies, in particular to a multi-signal alternating current test program-controlled power supply device based on an LXI bus.

Background

In order to realize voltage regulation and frequency modulation of alternating current output voltage, an alternating current power supply used in the current field test generally adopts an SPWM control mode, and in a commonly used SPWM method, an analog circuit is traditionally utilized to compare a sinusoidal modulation wave with a triangular carrier wave to generate SPWM pulses; in the existing research, a special chip for generating a PWM wave, such as DSP chips TMS320F240 and TMS320F2812 of TI corporation, is adopted to quickly implement various digital signal processing algorithms, so that the method has the advantages of good stability, high precision and high operation speed, and can conveniently generate SPWM control signals with very high frequency; the SPWM waveform can be generated in real time by utilizing the speed advantage of concurrent execution of the FPGA, so that the generated SPWM waveform has the frequency of a modulated wave, the carrier frequency, the modulation degree and the carrier ratio, and the dead time can be flexibly adjusted according to the requirement.

In addition, in terms of hardware structure, the inversion topology of the ac converter mainly includes: full-bridge topologies, half-bridge topologies, and push-pull topologies. The full-bridge topology is the most common topology structure, four switching tubes work alternately, the output capacity is large, and the full-bridge topology is often used in high-power occasions; the half-bridge topological structure is provided with two bridge arms, each bridge arm consists of a controllable device and an anti-parallel diode, the load is connected between the midpoint of the direct-current power supply and the connection points of the two bridge arms, and the driving circuit is simple; the push-pull topology structure uses two devices with the same parameters and exists in a circuit in a push-pull mode, an output stage is provided with two arms (two groups of amplifying elements), when the current of one arm is increased, the current of the other arm is reduced, and the states of the two arms are switched alternately. The output stage has two devices which are always in an on state and an off state, and the two devices are connected in a push-pull mode.

In terms of data communication, infrared communication technology, wired serial communication technology, and wireless communication are common device communication technologies. The infrared communication technology utilizes the infrared transmitting and receiving technology to convert the received infrared into an electric signal, and then the electric signal is transmitted to a processor for decoding, so that data or instructions sent by an infrared remote controller are received; the serial communication is a communication mode for sending and receiving binary data according to (bit) when equipment communicates, and currently, the commonly used serial communication modes include RS-232C, RS-485, CAN and the like; the wireless communication technology is to transmit signals on a wireless carrier by a signal modulation technology, and commonly used are ZIGBEE, LORA, bluetooth and the like.

However, practical application shows that when the SPWM is controlled, the conventional method of comparing the triangular wave with the sine wave has a complex design circuit, is difficult to connect with a digital system, and is difficult to meet complex requirements; for a special chip for generating SPWM waves, the function is single, complex control cannot be realized, and the control function cannot be changed along with different objects, so that the application range of the special chip is limited; the FPGA depends on hardware to realize all functions, and the speed of the FPGA can be compared with that of a special chip, but the flexibility of the design is greatly different from that of a general processor.

In a hardware topology structure, a full-bridge topology structure driving circuit is complex, and the output voltage inevitably contains a direct-current component due to the reasons of dead time, inconsistent characteristics of a switching tube and the like; the half-bridge topology structure is simple, but the voltage obtained at two ends of the load is lower and is only half of the voltage of a direct current power supply, two capacitors are needed to be connected in series to carry out voltage sharing on the direct current side, the output power is low, the collector current of a power switch tube is large, and the half-bridge topology structure is commonly used in low-power equipment below several kilowatts; the push-pull topological structure is simple, the two power tubes can be driven together, large-capacity power can be output, the power tubes bear 2 times of direct-current voltage of switching voltage, the voltage peak value is large, the transformer is only suitable for being applied to occasions with lower direct-current bus voltage, in addition, the utilization rate of the transformer is lower, and the driving of inductive loads is difficult.

During data communication, infrared transmission cannot be shielded and cannot penetrate a room, however, infrared rays can be reflected by walls and ceilings, and because infrared codes in electronic products are different, interference on equipment adjacent to the same room cannot be caused; the serial communication transmission protocol is single, the connection with various devices in industrial production cannot be met, and the realization function is simple; wireless communications are sensitive to electromagnetic environments.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide the multi-signal alternating current test program-controlled power supply device based on the LXI bus so as to eliminate common-mode interference and realize the purpose of accurately and effectively regulating output stable voltage.

The purpose of the invention can be realized by the following technical scheme: a multi-signal alternating-current test program-controlled power supply device based on an LXI bus comprises a differential symmetrical half-bridge module, a conjugate filtering module, a drive isolation module, a controller, a symmetrical sampling feedback module and an LAN communication display module, wherein the input of the differential symmetrical half-bridge module is a direct-current signal, the differential symmetrical half-bridge module is connected with the controller through the drive isolation module, the output of the differential symmetrical half-bridge module is connected with the conjugate filtering module, the conjugate filtering module is connected with the controller through the symmetrical sampling feedback module, the controller is also connected with the LAN communication display module, and the differential symmetrical half-bridge module is used for inverting and outputting the direct-current signal into two paths of alternating-current signals with phase difference of 180 degrees and equal frequency amplitude;

the conjugate filtering module is used for filtering the two paths of alternating current signals to obtain differential output voltage;

the symmetrical sampling feedback module is used for collecting instantaneous values of the differential output voltage;

the controller is used for processing the data acquired by the symmetrical sampling feedback module and outputting a real-time control waveform;

the LAN communication display module is used for realizing real-time monitoring and remote control of the controller on data.

Further, the differential symmetrical half-bridge module comprises a first chopping unit and a second chopping unit which are symmetrical to each other, and input ends of the first chopping unit and the second chopping unit are connected to the controller.

Further, the real-time control waveform output by the controller comprises an SPWM control waveform and a fault simulation signal waveform, wherein the SPWM control waveform is generated by PWM modulation according to a sinusoidal signal; the fault analog signal waveform is generated through PWM modulation according to the analog fault waveform based on a digital signal synthesis technology.

Further, the instantaneous values of the differential output voltage include the frequency and amplitude of the voltage and current.

Further, the symmetrical sampling feedback module comprises a hall sensor for collecting voltage and current data.

Further, the controller includes an RT1050 chip.

Further, the controller is connected with the LAN communication display module through an Ethernet interface module.

Further, the ethernet interface module includes a Media Access Controller (MAC) and a Physical Layer (PHY), the MAC is integrated in the controller, and the MAC is connected to the PHY and the ethernet connector through an MII/RMII standard interface.

Further, the MII/RMII standard interface is specifically provided by a KSZ8081RNBIA chip.

Further, the ethernet connector is embodied as HR 911105A.

Compared with the prior art, the invention has the following advantages:

the invention relates to a symmetrical topological structure, which is characterized in that a differential symmetrical half-bridge module is used for inverting an input direct current signal to obtain two paths of alternating current signals with phase difference of 180 DEG and equal frequency amplitude, the two paths of alternating current signals are subjected to conjugate filtering to obtain a differential output voltage, a symmetrical sampling feedback module is used for collecting the frequency and amplitude of the voltage and the current and sending the frequency and the amplitude to a controller, and finally a control signal is sent by the controller and enters the differential symmetrical half-bridge module through a driving isolation module, so that the interference of various common-mode signals can be effectively counteracted through the difference output of two completely symmetrical signals, and the quality of a power output waveform is ensured.

The invention is based on LXI communication, realizes the real-time monitoring and remote control of the controller to the data by using the LAN communication display module, can ensure the transmission speed of the data, and is more convenient to integrate because the LXI is based on the Ethernet technology, not only can be used independently, but also has the characteristic of modularization; when the test item is changed, the connection of the LXI on the LAN does not need to be changed, so that the construction time of the test system is shortened; a powerful complex test system can be assembled.

The controller not only can output SPWM control waveforms, but also can generate fault analog signals with small distortion degree based on a digital signal synthesis technology, so that voltage output adjustment can be more accurate and effective.

Drawings

FIG. 1 is a schematic diagram of the apparatus of the present invention;

FIG. 2 is a schematic diagram of a differential symmetrical half-bridge module according to the present invention;

FIG. 3 is a schematic diagram of the generation of a fault simulation signal in an embodiment;

FIG. 4 is a schematic connection diagram of a LAN interface according to an embodiment;

FIG. 5 is a diagram illustrating software functional layers corresponding to the power supply apparatus in the embodiment;

the notation in the figure is: 1. the device comprises a differential symmetrical half-bridge module, 2, a conjugate filtering module, 3, a drive isolation module, 4, a controller, 5, a symmetrical sampling feedback module, 6 and an LAN communication display module.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments.

Examples

As shown in fig. 1, a multi-signal alternating-current test program-controlled power supply device based on an LXI bus includes a differential symmetric half-bridge module 1, a conjugate filter module 2, a driving isolation module 3, a controller 4, a symmetric sampling feedback module 5 and a LAN communication display module 6, where an input of the differential symmetric half-bridge module 1 is a direct-current signal, the differential symmetric half-bridge module 1 is connected to the controller 4 through the driving isolation module 3, an output of the differential symmetric half-bridge module 1 is connected to the conjugate filter module 2, the conjugate filter module 2 is connected to the controller 4 through the symmetric sampling feedback module 5, the controller 4 is further connected to the LAN communication display module 6, and the differential symmetric half-bridge module 1 is configured to invert and output the direct-current signal into alternating-current signals with a phase difference of 180 ° and an equal frequency amplitude;

the conjugate filtering module 2 is used for filtering the two paths of alternating current signals to obtain differential output voltage;

the symmetrical sampling feedback module 5 is used for acquiring instantaneous values (including frequency and amplitude of voltage and current) of the differential output voltage;

the controller 4 is used for processing the data collected by the symmetric sampling feedback module 5 and outputting a real-time control waveform;

the LAN communication display module 6 is used for realizing the real-time monitoring and the remote control of the controller 4 to the data.

The specific working process of the power supply device is as follows: the power direct current bus inputs direct current signals, and outputs two paths of alternating current signals with phase difference of 180 degrees and equal frequency amplitude through inversion output of the differential symmetrical half-bridge module 1; obtaining differential output voltage through the conjugate filter module 2; the symmetrical sampling feedback module 5 collects the frequency and amplitude of the voltage and the current and sends the frequency and amplitude to the controller 4; the controller 4 sends an SPWM signal which enters the differential symmetrical half-bridge module 1 through the drive isolation module 3; the controller 4 realizes real-time monitoring of data and remote control through the LAN communication display module 6. In this embodiment, the controller 4 employs a microprocessor whose chip is RT1050, and its core operating speed can reach 600MHz (in contrast, the highest speed of the existing MCU is only 400MHz), so that an ultra-fast real-time response can be realized, where the interrupt delay is as low as 20 ns, and for a complex SPWM algorithm, the acquired data can be reliably processed, so as to realize real-time control of output waveforms and effectively reduce the total harmonic distortion of output voltage.

The specific structure of the differential symmetrical half-bridge module 1 is shown in fig. 2, and includes a first chopping unit and a second chopping unit (i.e., a chopping circuit a and a chopping circuit B in the figure) that are symmetrical to each other, and input ends of the first chopping unit and the second chopping unit are both connected to the controller 4. The differential structure is to take the difference value output of two completely symmetrical signals, which can counteract the influence of various common-mode signals, and the invention adopts the symmetrical structure from three aspects:

1. differential output voltage

As shown in fig. 2, a direct current signal enters a two-way chopper circuit; an SPWM module of a microprocessor with a chip of RT1050 sends out sine wave signals to control a chopper circuit and change the voltage; the pure output voltage is obtained through the filter circuit. The sampling circuit collects phase, frequency and amplitude data of output voltage, and the data are processed by the microprocessor so as to control the SPWM module; the part B of the block diagram is the same as the part A of the block diagram in working principle, but the phase difference of the output voltage is 180 degrees, and two paths of voltages supply power to a load.

2. Conjugate filter circuit

Two paths of sine wave signals output by the SPWM module are completely symmetrical and opposite, so that the filtering effect is the same when a filtering circuit is designed.

3. Symmetric sampling feedback circuit

In order to keep the output voltage stable, the instantaneous value of the output voltage needs to be fed back in real time. And voltage at two ends of a capacitor on the filter and current on the filter are collected through the Hall sensor. The data is transmitted to the controller after being processed. The sampling feedback circuit is also completely symmetrical due to the voltage differential output.

In addition, the real-time control waveform output by the controller 4 includes an SPWM control waveform and a fault simulation signal waveform, wherein the SPWM control waveform is specifically generated by PWM modulation according to a sinusoidal signal; the fault analog signal waveform is generated by PWM modulation according to the analog fault waveform based on digital signal synthesis technology. As shown in fig. 3, a sine signal y ═ a sin (ω t) is taken as a base signal, n points in the base signal are stored in a character string, and saturated distortion fault wave types as shown in the figure are taken as needed: the solid line waveform is a basic waveform, when the waveform is saturated and distorted, points at the distorted position of the waveform are filled, and as shown by points after AB section position distortion is saturated, the dotted line waveform is a fault waveform. A plurality of characteristic points are taken from the fault waveform, vector transformation is carried out on the characteristic points, the frequency and the amplitude of the fault waveform can be changed, and cubic spline function calculation is carried out on the transformed points, so that the required fault waveform function can be obtained. The obtained fault analog signal has small distortion degree, is convenient for the controller to control fault waveforms and conventional waveforms, and has high accuracy of the generated waveforms.

The controller 4 and the LAN communication display module 6 of the present invention are connected through an ethernet interface module, as shown in fig. 4, the ethernet interface module includes a MAC (Media Access controller) and a PHY (Physical Layer), the MAC is integrated in the controller, and the MAC is respectively connected with the PHY and the ethernet connector through an MII/RMII standard interface. Specifically, an RT1050 embedded Ethernet controller, an SDK (software development kit) packaged with an Ethernet protocol stack and a FreeRTOS (FreeRTOS) are used, and on the basis, a web-based LXI standard is developed. The Ethernet interface circuit mainly comprises two parts of MAC and a physical layer interface PHY, the MAC is integrated into the RT050 processor, the PHY is left outside the chip to form a MAC-NET core, the double speed 10/100m-bit/s conforming to the IEEE0.3-2002 standard is realized, and a KSZ8081RNBIA chip is selected to provide an MII/RMII standard interface for connecting the MAC and the PHY in the embodiment; an HR911105A Ethernet connector is selected, and an isolation transformer is arranged in the connector to be connected with an RJ45 interface.

Fig. 5 shows that the above technical solution is applied to the present embodiment, and the corresponding software function level is schematic, so as to be known in the above, the present invention provides a hardware symmetric topology structure, and can generate a fault analog signal based on a digital signal synthesis technology, and can output a sine wave signal with a known amplitude frequency, and a rectangular pulse source with a known leading edge time, a known pulse width, and a known repetition period, and parameters of the signal source, such as frequency, waveform, and output voltage, can be accurately adjusted within a certain range. Besides the conventional waveform signal, the stability of the electric equipment during operation is also observed when the electric equipment is tested, and the operation condition of the electric equipment is observed and monitored when the voltage fluctuation and the voltage deviation of the circuit are simulated.

The invention has rich output functions, can output high-quality alternating voltage, and has the characteristics of high precision and high stability of the amplitude and the frequency of the output voltage.

Therefore, the invention eliminates common mode interference (mainly direct current output) through a power supply hardware topological structure; a high-performance microprocessor is used for carrying out a complex algorithm to enable the output voltage to be stable; the switching frequency is improved, so that the whole equipment has small volume and light weight and is convenient to carry on-site test; the fault analog signal generation method based on the digital signal synthesis technology enables voltage output regulation to be more accurate and effective. Because the structure is free of transformer, the manufacturing cost is reduced, the volume is reduced, and the efficiency is improved; moreover, the automatic test can be realized, the operation complexity is reduced, and the objectivity of equipment measurement can be improved; small volume and light weight, and solves the problem of field test.