Problems to be considered in the practical design of miniature transformers

As an important electrical equipment in the power system, the accurate work of the miniature transformer will affect the power measurement, relay protection, system monitoring and power system analysis of the power system. Traditional electromagnetic current transformers are still widely used in power systems. With the increasing improvement of power system and grid voltage, the insulation problems of traditional electromagnetic current transformers are obvious.

With the advancement of technology, the current electronic miniature transformers on the market are more popular with users. The product adopts optical fiber technology, has good insulation, and meets the voltage level requirements of the power system and the development direction of automation and digitalization. The advantages of electronic current transformers are simple process, good stability, high precision, low price, etc., and they have good prospects.

In the structural design and improvement, the basic functions of the high-voltage side circuit are realized, and the power efficiency is reduced as much as possible. The low-power design of the high-voltage side circuit meets the development needs of modern electronic products, and is also an issue that should be considered when miniature transformers move toward practical use. For a slightly more complicated or intelligent instrument, you can consider using a single-chip microcomputer as the core control component. Because the current single-chip microcomputer itself has the characteristics of low power consumption, its own current consumption is relatively low. Using its intelligent features can replace many separate devices, which is conducive to power management, meets intelligent features and improves product reliability.

In terms of anti-interference, the circuit design of miniature transformers should take into account the separation of analog signals and digital signals, as well as the electromagnetic compatibility circuit wiring problems such as power supply filtering and isolation. Make full use of the multi-source reset of the single-chip microcomputer to increase the reliability of the operation of the circuit and the program.

In addition, in actual applications, full consideration and use of shielding measures for isolation should also be used to prevent the miniature transformer from being affected by the external magnetic field. Moreover, the circuit structure is further simplified while increasing its reliability, and the introduction of the single-chip microcomputer is helpful for the realization of intelligent functions such as self-diagnosis and self-compensation.