How to use ADI System Solutions Selection to develop new products

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Good news, in order to facilitate the design and development needs of engineers, the so-called design bible "ADI System Solution Selection" has come out with its fifth edition. The book covers solutions to related technologies in six major directions: industrial instrumentation, energy, the Internet of Things, automotive electronics, aerospace and defense, and medical health.

How wonderful and practical is this book? Let's take the motor control solution servo control as an example to see how this book can help you from entry to mastery.

Overview

The book covers solutions to related technologies in six major directions: industrial instrumentation, energy, the Internet of Things, automotive electronics, aerospace and defense, and medical health. In the solutions provided, for each design, the book not only provides the key design points that need to be considered and the current technical challenges, but also provides system block diagrams and signal chains, clearly showing the basic components and interrelationships of each system, making it easier for R&D or design staff to understand and master complex circuits as a whole. At the same time, R&D or design staff can also design circuits, calculate parameters, and select devices for each unit in the block diagram based on the system block diagram and signal chain, after clarifying the tasks of each part in the block diagram, and finally complete the design of the system circuit schematic. In order to further help R&D and design personnel develop products faster and more efficiently, the book also provides reference designs and demonstration board introductions for each system design, which just meets the needs of all R&D and design personnel for new product development. Click to get >>《ADI System Solutions Selection (Volume 5)》

Examples of product development based on ADI system solutions Here, we take the first design solution given in the book - motor control solution servo control as an example to see how much help this book can provide to engineers. From basic component selection to overall design, everything is very clear. 1. Selection of basic components for motor control In system design considerations and major challenges, for example: ADI's design requirements for the accuracy of the sampling circuit require at least 12-bit accuracy, and an ADC with multi-channel and synchronous sampling functions. At the same time, it also explains why 12-bit accuracy should be selected, because "in servo control, high-precision current and voltage detection can improve speed and torque control performance." This avoids the trouble caused by low accuracy when selecting basic components at the beginning of new product development. In addition, for the main control chip of the motor controller, the book recommends two chips, ADSP-CM408F and ADSP-CM419F. 2. How to design the circuit schematic diagram according to the system block diagram and signal chain Friends who do projects know that before drawing the schematic diagram, it is necessary to give a system block diagram according to the circuit functional modules and performance index requirements, and then design a reasonable circuit according to each module of the system block diagram. Although the reference design drawings disclosed by the manufacturer to users are not product-level things, they should also be strictly verified, otherwise it will affect the promotion and application of their chips. Even if we refer to the peripheral circuits they design, it is worthy of our trust. The system block diagram and signal chain given in this book are shown in Figure 1. This figure is of vital help for project development.

Figure 1 System Block Diagram and Signal Chain

Outline part of the circuit in Figure 1 with a red frame, as shown in Figure 2 for details.

Figure 2 Block diagram of Hall sensor and shunt detection module

In Figure 2, in the phase current detection circuit, the three-phase current should be measured with 2 or 3 shunts. It should be noted that, since it is three-phase, if 2 shunts are used, the main controller needs to calculate the magnitude of the phase current that is not shunted. The signal collected by the Hall sensor is directly connected to the main controller through an amplifier (AMP). In Figure 2, the IC chips that may be used in each module are given, and the book also shows them in a list for designers to refer to, as shown in Table 1 below.

Table 1 Commonly used chips for current and voltage measurement

According to the design reference provided above, it is easy for R&D designers to complete. Here, AD7041 is selected as the current isolation ADC, AD8646 is selected as the filter amplifier, and AD8515 is selected as the amplifier for the Hall sensor signal acquisition (here it is based on the reference design schematic diagram given by ADI, so the reference chip given in the chart of the book is not used), and the specific IC block diagram of the Hall sensor and shunt detection circuit is obtained as shown in Figure 3.

Figure 3 Specific IC block diagram of the Hall sensor and shunt detection circuit

Since the designs of the three phases W, U, and V are the same, it is easy to obtain the AD8515 design circuit schematic diagram of the U-phase Hall sensor acquisition module according to Figure 3, as shown in Figure 4.

Figure 4 Schematic diagram of the AD8515 design circuit of the U-phase Hall sensor acquisition module

Similarly, according to Figure 3, it is also easy to get the schematic diagram of the ISO_PowerADuM5000 module, as shown in Figure 5.

Figure 5 Schematic diagram of the ISO_PowerADuM5000 module

Since two phase current detection shunts are used, the two phase current detection circuits are also the same in structural design, so the schematic diagram of the V-phase phase current acquisition is given here. Similarly, according to Figure 3, it is also easy to get the schematic diagram of the Sigma-Delta ADC Modulator AD7401 module, which is a subsequent circuit for detecting phase current using the shunt circuit, as shown in Figure 6 below.

Figure 6 Schematic diagram of Sigma-Delta ADC Modulator AD7401 module

As for the circuit of Filter AD8646 involved in Figure 3, users can refer to the data sheet of this chip to design it by themselves. The circuit schematic diagram of this module is not given here. According to the Isolated Gate Driver module in Figure 1, that is, the IGBT driver module, this module must first complete the selection of the driver chip. Designers can complete the schematic diagram of this module according to the reference design given by the chip manufacturer. Here is the circuit schematic diagram of the module designed using the FSBB20CH60C chip, as shown in Figure 7. Figure 7 Isolated Gate Driver Module Figure 1 also involves the PFC circuit. In order to improve the power quality of the power grid and reduce the harmonic current consumption, power factor correction is required. The PFC circuit is generally required for low voltage and low power factor requirements. Capacitors can be added to improve the power factor. Since the motor control circuit is high voltage and has strict power factor requirements, the three-phase Vienna PFC topology is generally used in this case. Due to the Vienna PFC topology, TI provides detailed design information (including schematics and programs), which designers can obtain from TI's official website or agents. Therefore, the schematic diagram of the PFC module is not given here, only the PFC system block diagram is given, as shown in Figure 8.

Figure 8 PFC system block diagram

Similarly, the system block diagram of Figure 1 and the schematic design of other modules in the signal chain can be completed separately. After the circuit schematics of each module are designed, it is only necessary to connect the actual circuit schematics of each module according to the connection method of each interface in the block diagram to obtain the final circuit schematic of the product. The PCB board diagram formed by this circuit schematic can be used to generate the motor controller. Summary "ADI System Solution Selection (Fifth Edition)" provides a detailed system development block diagram for design and development, and gives a detailed introduction to the selection of various devices and matters that need to be paid attention to in the development of various products. It is of great significance to speed up the development of new products. This book is worth referring to and reading by designers. Enter ADI System Solution Selection (Fifth Edition)cn/a17588]【ADI Resource Center】[/url] , download more ADI selected technical information! This content is originally created by EEWORLD forum user alan000345. If you need to reprint or use it for commercial purposes, you must obtain the author's consent and indicate the source