Electronic Design - 8 steps are essential to ensure a successful PCB design!

The printed circuit board (PCB) is the body of electronic products, and the performance, life and reliability of the final product depend on the electrical system it constitutes. If properly designed, products with high-quality circuits will have a lower on-site failure rate and on-site return rate. Therefore, the production cost of the product will be lower and the profit will be higher. In order to produce high-quality PCB boards on time, without increasing design time and without costly rework, design and circuit integrity issues must be discovered as early as possible in the design process.

In order to quickly and reliably introduce products to the PCB market, it is necessary to use design tools to automate the design process, but how can we ensure the success of the design? In order to maximize design efficiency and product quality, what details should be paid attention to? Design tools should obviously be intuitive and easy to use and powerful enough to overcome complex design challenges, but what else is worth noting? This article lists four steps that can be taken to ensure a successful PCB design.

Schematic input is very important for the logical connection of the generated design. It must be accurate, easy to use, and integrated with the layout to ensure the success of the design.

Simply inputting the schematic and transferring it to the layout is not enough. In order to create a high-quality design that meets expectations, it is necessary to ensure that the best components are used and simulation analysis can be performed to ensure that the design will not go wrong when it is delivered to manufacturing.

Management is an important part of the design process. In order to quickly select the best components and place them in the design, the easy creation and easy management of devices is very necessary

In recent years, the complexity of PCB layout design is significantly higher than before. In order to manufacture smaller and more portable electronic devices, the design density has to be increased. In addition, the operating frequency has also been increased, which requires designers to evaluate electrical characteristics that may have been overlooked in the past to ensure that the design is usable. In order to keep up with the pace of increasing complexity, designers must have broader capabilities to define advanced rule sets, create unique RF shapes, and implement correction structures to improve the overall performance of the design.

Although manual wiring is generally used to achieve the true design intent, the effective combination of interactive wiring and automatic wiring helps to meet market time limit requirements and improve design quality. Automatic routing can also help deal with difficult tasks, such as differential pair routing, network adjustment, manufacturing optimization, micro vias, and build-up technology. If the wiring strategy is planned in advance, the efficiency of using automatic wiring will be greatly improved.

Another challenge is that modern PCBs have to maintain thousands of networks, which may cause difficulties for routing in key areas of the design. The best way to avoid this problem is to divide the network cables into groups in order to create an effective routing strategy. After the planning group is created, the network group can be marked and filtered to highlight the key networks that need to be wired.

1. Overcurrent protection: It automatically cuts off the power when the current is too large to prevent damage to circuits and cases caused by exceeding the rated current.

2. Overvoltage protection: mainly to prevent damage to electronic components caused by overvoltage or electrostatic discharge. It is widely used in various electronic system products such as telephones, fax machines and high-speed transmission interfaces, especially electronic communication equipment. It is especially important to avoid damage to electronic equipment due to abnormal voltage or electrostatic discharge.

3. Over-temperature protection: temperature protection components have gone through from commercialization to the present. At present, over-temperature protection components are widely used in occasions with special requirements for temperature. Such protection components can be divided into chemical Chemical actuation type and low temperature alloy actuation type. The main feature of chemical actuation type products is that they can be made into low temperature products, but the structure is more complicated and the cost is higher; the low temperature alloy type actuation is mainly a large diameter The low-temperature fuse plays a conductive role. It must be ensured that the heat generated by the rated current does not melt the fuse. The low-temperature fuse generally adjusts its melting point by adjusting the proportion of tin, copper, silver, bismuth, indium and other components.

4. Over-temperature and over-current protection: In recent years, with the improvement of applications, the simple temperature protection function can no longer meet the needs of the ever-changing electrical appliances, motors, motors and 3C products for safety protection. It also monitors and protects components in time under abnormal voltage conditions. The rise of such components is mainly based on lithium-ion batteries and lithium polymer batteries.

5. Over-current and over-voltage: With the complexity of modern electronic products, the requirements for the use of protective components are also increasing, such as comprehensive protection, limited reserved space, etc. With these requirements, the field of protective components has risen There has been a boom in combination packaging. As mentioned above, over-current and over-temperature protection can also be regarded as a kind of combination packaging, but most of the over-current and over-voltage protection combination packaging products are still in the research and development stage, and there are no mature commercial products. Available on the market.

Overcurrent protection devices mainly include disposable fuses, self-recovery fuses, fusing resistors and circuit breakers, among which the most important is self-recovery fuses. The following are the key points for selecting over-current protection devices PTC self-recovery fuses:

1. The holding current should be slightly larger than the user's normal working current.

2, Vmax should be greater than or equal to the user's maximum working voltage.

3, Imax should be greater than the maximum fault short-circuit current.

With the development of science and technology, power/electronic products are becoming increasingly diversified and more complex. The circuit protection PCB components used is no longer the simple glass tube fuse of the past. The protection devices usually include varistors, TVS, gas discharge tubes, etc. Has developed into a wide range of emerging electronic components field.