A three-level open source driver system

Abstract

The invention discloses a three-level open source driver system, which relates to the field of electromechanical control, and comprises a signal adapter board, a three-level processing board, a three-level driving board, a three-level bus capacitor board and an EMC electromagnetic compatibility board; the EMC electromagnetic compatibility board is used to reduce and suppress electromagnetic interference generated by the three-level open source driver system; the signal adapter board is used to collect signals and send the collected signals to the three-level processing board; the three-level processing board is used to condition the collected signals, and the three-level processing board comprises a first sampling signal conditioning module, a digital input module, a digital output module, a multi-channel power supply module, an encoder collection module, a protection module and a fault reset module; the system has the advantages of small voltage change rate, large output capacity, small loss, low distortion factor, low output harmonic content, high topology withstand voltage, good output voltage signal quality and perfect protection function.

Description

Technical Field

[0001] The present invention relates to the field of electromechanical control, and in particular to a three-level open source driver system. Background Art

[0002] In recent years, with the rapid development of distributed new energy and high-precision manufacturing, the motor drive technology has been widely used in a variety of high-precision manufacturing and tracking systems, including new energy power generation systems, industrial automation systems, military aerospace and other fields. As the most common and basic control and energy conversion device, the tracking accuracy, response speed and anti-interference ability of the motor drive system play a vital role in the electrical equipment connected to it. Therefore, the high-precision control of modern motor drive technology has received more and more attention. The present invention provides a three-level open source driver. Summary of the invention

[0003] The technical problem to be solved by the present invention is that the existing motor power driver has problems such as large loss, insufficient compatibility, low stability, etc., and a three-level open source driver system is provided to solve the above problems. The three-level open source driver system includes:

[0004] A signal transfer board, a three-level processing board, a three-level driving board, a three-level bus capacitor board and an EMC electromagnetic compatibility board, wherein the signal transfer board, the three-level processing board, the three-level driving board, the three-level bus capacitor board and the EMC electromagnetic compatibility board are electrically connected;

[0005] The EMC electromagnetic compatibility board is used to reduce and suppress the electromagnetic interference generated by the three-level open source driver system;

[0006] The signal adapter board is used to collect the signals and send the collected signals to the three-level processing board;

[0007] The three-level processing board is used to condition the collected signal. The three-level processing board includes a first sampling signal conditioning module, a digital input module, a digital output module, a multi-way power supply module, an encoder acquisition module, a protection module and a fault reset module. The input end of the digital input module is electrically connected to the sampling signal conditioning module and the encoder acquisition module at the same time, and the output end is electrically connected to the digital output module. The multi-way power supply module is used to provide power to the sampling signal conditioning module, the digital input module, the digital output module, the encoder acquisition module, the protection module and the fault reset module. The sampling signal conditioning module is used to collect current signals and voltage signals. The encoder acquisition module and the signal conditioning module are used to receive information sent by the encoder. The protection module is used to prevent the circuit from overvoltage, overcurrent and overtemperature. The fault reset module is used to restore the circuit setting state.

[0008] The three-level bus capacitor plate is used for smoothing filtering, and the three-level bus capacitor plate is electrically connected to the three-level driving board;

[0009] The three-level driving board includes a universal three-phase bridge module, a power module and a relay module. The universal three-phase bridge module, the power module and the relay module are electrically connected. The three-level driving board is used to convert digital signals into analog signals, and transmit them to the controlled object after conditioning and amplification.

[0010] Furthermore, the present invention provides a three-level open source driver system, wherein the first sampling signal conditioning module includes a first current sampling module, a first voltage sampling module, a first Hall voltage sensor and a first Hall current sensor, the first Hall current sensor is electrically connected to the first current sampling module, the first Hall voltage sensor is electrically connected to the first voltage sampling module, and the number of signal paths collected by the first current sampling module and the first voltage sampling module is 4.

[0011] Furthermore, the present invention provides a three-level open source driver system, wherein the three-level bus capacitor board includes three capacitor groups, each of the capacitor groups includes a first capacitor, a second capacitor, a third capacitor and a fourth capacitor, the positive electrode of the first capacitor is electrically connected to the positive electrode of the third capacitor, the negative electrode of the first capacitor is electrically connected to the negative electrode of the third capacitor, the positive electrode of the second capacitor and the positive electrode of the fourth capacitor at the same time, the negative electrode of the third capacitor is electrically connected to the positive electrode of the fourth capacitor, the negative electrode of the second capacitor is electrically connected to the negative electrode of the fourth capacitor, the positive electrode of the first capacitor and the positive electrode of the third capacitor are both electrically connected to the three-level drive board at the same time, and the negative electrode of the second capacitor and the negative electrode of the fourth capacitor are both electrically connected to the three-level drive board at the same time.

[0012] Furthermore, the present invention provides a three-level open source driver system, wherein the input end of the three-phase bridge module is used to be electrically connected to an external power supply, the output end is electrically connected to the power module, and the three-phase bridge module is used to rectify the external power supply.

[0013] Furthermore, the present invention provides a three-level open source driver system, wherein the power module is an IGBT module.

[0014] Furthermore, the present invention provides a three-level open source driver system, wherein the EMC electromagnetic compatibility board includes an L filter module, a first LC filter module and a second LC filter module, and the L filter module, the first LC filter module and the second LC filter module are electrically connected in sequence.

[0015] Furthermore, the present invention provides a three-level open source driver system, wherein the three-level bus capacitor plate also includes a starting charging unit and a voltage balancing unit, the starting charging unit and the voltage balancing unit are electrically connected to the capacitor group in sequence, the starting charging unit is used to protect the circuit, and the voltage balancing unit is used to prevent voltage imbalance at the upper and lower ends of the bus capacitor.

[0016] Furthermore, the present invention provides a three-level open source driver system, wherein the relay module is used to prevent the three-level driver board from overcurrent, overvoltage and overtemperature.

[0017] The implementation of the present invention has the following beneficial effects: the present invention adopts a three-level open source driver to improve the voltage level of the driver application, and the topological advantage can obtain more orders of output voltage, so that the output waveform is closer to a sine wave, and has less harmonic content, a small voltage change rate, a large output capacity, a small loss, a low distortion factor, a low output harmonic content, a high topological withstand voltage, a good quality of the output voltage signal and a complete protection function. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a structural diagram of a three-level open source driver system of the present invention;

[0019] Figure 2 It is a topological structure diagram of a bus capacitor board of a three-level open source driver system of the present invention;

[0020] Figure 3 It is a topological structure diagram of an EMC electromagnetic compatibility board of a three-level open source driver system of the present invention;

[0021] Figure 4 It is a structural diagram of a three-level open source driver system of the present invention when it is connected to the grid.

[0022] The corresponding reference numerals should be: 1-three-term four-wire non-linear load, 2-PWM current tracking control drive circuit and 3-instruction calculation current. DETAILED DESCRIPTION

[0023] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings. Example

[0024] The technical problem to be solved by the present invention is that the existing motor power driver has problems such as large loss, insufficient compatibility, low stability, etc., and a three-level open source driver system is provided to solve the above problems. The three-level open source driver system includes:

[0025] A signal transfer board, a three-level processing board, a three-level driving board, a three-level bus capacitor board and an EMC electromagnetic compatibility board, wherein the signal transfer board, the three-level processing board, the three-level driving board, the three-level bus capacitor board and the EMC electromagnetic compatibility board are electrically connected;

[0026] The EMC electromagnetic compatibility board is used to reduce and suppress the electromagnetic interference generated by the three-level open source driver system;

[0027] The signal adapter board is used to collect the signals and send the collected signals to the three-level processing board;

[0028] The three-level processing board is used to condition the collected signal. The three-level processing board includes a first sampling signal conditioning module, a digital input module, a digital output module, a multi-way power supply module, an encoder acquisition module, a protection module and a fault reset module. The input end of the digital input module is electrically connected to the sampling signal conditioning module and the encoder acquisition module at the same time, and the output end is electrically connected to the digital output module. The multi-way power supply module is used to provide power to the sampling signal conditioning module, the digital input module, the digital output module, the encoder acquisition module, the protection module and the fault reset module. The sampling signal conditioning module is used to collect current signals and voltage signals. The encoder acquisition module and the signal conditioning module are used to receive information sent by the encoder. The protection module is used to prevent the circuit from overvoltage, overcurrent and overtemperature. The fault reset module is used to restore the circuit setting state.

[0029] The three-level bus capacitor plate is used for smoothing filtering, and the three-level bus capacitor plate is electrically connected to the three-level driving board;

[0030] The three-level driving board includes a universal three-phase bridge module, a power module and a relay module. The universal three-phase bridge module, the power module and the relay module are electrically connected. The three-level driving board is used to convert digital signals into analog signals, and transmit them to the controlled object after conditioning and amplification.

[0031] In a specific embodiment, the first sampling signal conditioning module includes a first current sampling module, a first voltage sampling module, a first Hall voltage sensor and a first Hall current sensor, the first Hall current sensor is electrically connected to the first current sampling module, the first Hall voltage sensor is electrically connected to the first voltage sampling module, and the number of signal paths collected by the first current sampling module and the first voltage sampling module is 4.

[0032] In a specific embodiment, the three-level bus capacitor plate includes three capacitor groups, each of the capacitor groups includes a first capacitor, a second capacitor, a third capacitor and a fourth capacitor, the positive electrode of the first capacitor is electrically connected to the positive electrode of the third capacitor, the negative electrode of the first capacitor is electrically connected to the negative electrode of the third capacitor, the positive electrode of the second capacitor and the positive electrode of the fourth capacitor at the same time, the negative electrode of the third capacitor is electrically connected to the positive electrode of the fourth capacitor, the negative electrode of the second capacitor is electrically connected to the negative electrode of the fourth capacitor, the positive electrode of the first capacitor and the positive electrode of the third capacitor are both electrically connected to the three-level drive board at the same time, and the negative electrode of the second capacitor and the negative electrode of the fourth capacitor are both electrically connected to the three-level drive board at the same time.

[0033] In a specific embodiment, the input end of the three-phase bridge module is used to be electrically connected to an external power source, and the output end is electrically connected to the power module, and the three-phase bridge module is used to rectify the external power source.

[0034] In a specific implementation, the power module is an IGBT module.

[0035] In a specific implementation, the EMC electromagnetic compatibility board includes an L filter module, a first LC filter module and a second LC filter module, and the L filter module, the first LC filter module and the second LC filter module are electrically connected in sequence.

[0036] In a specific embodiment, the three-level bus capacitor plate also includes a starting charging unit and a voltage balancing unit, which are electrically connected to the capacitor group in sequence, the starting charging unit is used to protect the circuit, and the voltage balancing unit is used to prevent voltage imbalance at the upper and lower ends of the bus capacitor.

[0037] In a specific implementation, the relay module is used to prevent the three-level driving board from over-current, over-voltage and over-temperature.

[0038] The main working principle of this embodiment for motor applications is: the open source driver uses the DSPACE real-time simulation controller or the digital signal processor DSP as the control core, sends instructions to the DS1202 signal switching system or the DS1007 signal switching system for amplification, isolation and signal conditioning, and then sends the instructions to the open source driver for processing:

[0039] 1) Condition the collected current, voltage, encoder and other signals, handle fault protection and fault reset in time, and indirectly control digital input and output signals and other functions;

[0040] 2) Convert weak current digital signals into analog signals, condition and amplify them and transmit them to the controlled objects; invert the industrial frequency AC power supply or DC power supply into AC power supply of various frequencies and provide it to the controlled objects, thereby realizing the power conversion function of the power supply, and further realizing the functions of voltage regulation, frequency regulation, current regulation and speed regulation; thus, more complex control algorithms (CLARKE, PARK, PID, sliding mode, neural network, adaptive, predictive control and other complex algorithms) can be realized, realizing digitization, networking and intelligence. Power devices generally use drive circuits designed with intelligent power modules IPM, PIM, IGBT, and silicon carbide SIC as the core. The IPM integrates the drive circuit inside, and also has fault detection and protection circuits such as overvoltage, overcurrent, overheating, and undervoltage. A soft start circuit is also added to the main circuit to reduce the impact of the startup process on the driver; the power drive unit first rectifies the input three-phase power or AC power through a three-phase full-bridge rectifier circuit to obtain the corresponding DC power. After the rectified three-phase power or AC power, the three-phase permanent magnet synchronous AC servo motor is driven by a three-phase sinusoidal PWM voltage inverter. The entire process of the power drive unit can be simply described as an AC-DC-AC process; the main topology circuit of the rectifier unit (AC-DC) is a three-phase full-bridge uncontrolled rectifier circuit. The driver can generally adopt three control modes: position, speed, and torque, and is mainly used in high-precision positioning systems.

[0041] This embodiment is aimed at the main working principle of the grid-connected control application (refer to the attached manual Figure 4 ): The open source drive inverter is mainly used in the grid-connected system. As a power supply and transmission equipment interconnected with the power grid, it must meet the normal operation of the power grid within the allowable voltage fluctuation and frequency deviation range; it mainly uses a three-level IGBT module as the inverter power unit and uses dSPACE as the main controller to achieve the user's goal. Through the three-phase transformer isolation boost grid connection, the maximum power tracking control of the photovoltaic cell and the grid-connected current control are realized. The open source driver uses the DSPACE real-time simulation controller or the digital signal processor DSP controller as the control core, sends instructions to the DS1202 signal switching system or the DS1007 signal switching system for amplification, isolation and signal conditioning, and then sends the instructions to the open source inverter for processing:

[0042] 1) Convert DC power into AC power with the same frequency and phase as the main grid voltage and feed it to the main grid. At the same time, it monitors various fault information to ensure normal operation in real time.

[0043] 2) Track the maximum power output (MPPT) of the DC source (PV module or PV simulation source) based on the feedback value;

[0044] 3) All information about the system operation can be uploaded to the host computer for monitoring;

[0045] 4) Energy storage bidirectional DC / DC DC bus voltage control based on PWM;

[0046] 5) PWM-based on-grid and off-grid switching control;

[0047] 6) Natural wind simulation experiment;

[0048] 7) Permanent magnet synchronous generator load test;

[0049] 8) Grid connection experiment of direct drive / doubly fed wind power generation simulation platform;

[0050] 9) Island effect experiment;

[0051] 10) Photovoltaic control strategy and programming experiment;

[0052] The implementation of the present invention has the following beneficial effects: the present invention adopts a three-level open source driver to improve the voltage level of the driver application, and the topological advantage can obtain more orders of output voltage, so that the output waveform is closer to a sine wave, and has less harmonic content, a small voltage change rate, a large output capacity, a small loss, a low distortion factor, a low output harmonic content, a high topological withstand voltage, a good quality of the output voltage signal and a complete protection function.

[0053] The above disclosures are only several preferred embodiments of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A three-level open source driver system, characterized in that: It includes a signal transfer board, a three-level processing board, a three-level driving board, a three-level bus capacitor board and an EMC electromagnetic compatibility board, wherein the signal transfer board, the three-level processing board, the three-level driving board, the three-level bus capacitor board and the EMC electromagnetic compatibility board are electrically connected; The EMC electromagnetic compatibility board is used to reduce and suppress the electromagnetic interference generated by the three-level open source driver system; The signal adapter board is used to collect the signals and send the collected signals to the three-level processing board; The three-level processing board is used to condition the collected signal. The three-level processing board includes a first sampling signal conditioning module, a digital input module, a digital output module, a multi-way power supply module, an encoder acquisition module, a protection module and a fault reset module. The input end of the digital input module is electrically connected to the sampling signal conditioning module and the encoder acquisition module at the same time, and the output end is electrically connected to the digital output module. The multi-way power supply module is used to provide power to the sampling signal conditioning module, the digital input module, the digital output module, the encoder acquisition module, the protection module and the fault reset module. The sampling signal conditioning module is used to collect current signals and voltage signals. The encoder acquisition module and the signal conditioning module are used to receive information sent by the encoder. The protection module is used to prevent the circuit from overvoltage, overcurrent and overtemperature. The fault reset module is used to restore the circuit setting state. The three-level bus capacitor plate is used for smoothing filtering, and the three-level bus capacitor plate is electrically connected to the three-level driving board; The three-level driving board includes a universal three-phase bridge module, a power module and a relay module, wherein the universal three-phase bridge module, the power module and the relay module are electrically connected, and the three-level driving board is used to convert the digital quantity signal into an analog quantity signal, and transmit it to the controlled object after conditioning and amplification; The first sampling signal conditioning module includes a first current sampling module, a first voltage sampling module, a first Hall voltage sensor and a first Hall current sensor, the first Hall current sensor is electrically connected to the first current sampling module, the first Hall voltage sensor is electrically connected to the first voltage sampling module, and the number of signal paths collected by the first current sampling module and the first voltage sampling module is 4; The three-level busbar capacitor plate includes three capacitor groups, each of which includes a first capacitor, a second capacitor, a third capacitor and a fourth capacitor, the positive electrode of the first capacitor is electrically connected to the positive electrode of the third capacitor, the negative electrode of the first capacitor is electrically connected to the negative electrode of the third capacitor, the positive electrode of the second capacitor and the positive electrode of the fourth capacitor at the same time, the negative electrode of the third capacitor is electrically connected to the positive electrode of the fourth capacitor, the negative electrode of the second capacitor is electrically connected to the negative electrode of the fourth capacitor, the positive electrode of the first capacitor and the positive electrode of the third capacitor are both electrically connected to the three-level driving board at the same time, and the negative electrode of the second capacitor and the negative electrode of the fourth capacitor are both electrically connected to the three-level driving board at the same time; The input end of the universal three-phase bridge module is used to be electrically connected to an external power supply, and the output end is electrically connected to the power module, and the three-phase bridge module is used to rectify the external power supply; The power module is an IGBT module; The EMC electromagnetic compatibility board comprises an L filter module, a first LC filter module and a second LC filter module, and the L filter module, the first LC filter module and the second LC filter module are electrically connected in sequence; The three-level bus capacitor plate further includes a starting charging unit and a voltage balancing unit, wherein the starting charging unit and the voltage balancing unit are electrically connected to the capacitor group in sequence, the starting charging unit is used to protect the circuit, and the voltage balancing unit is used to prevent voltage imbalance at the upper and lower ends of the bus capacitor; The relay module is used to prevent the three-level driving board from over-current, over-voltage and over-temperature.

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