Let's take a look at the structure of the power button switch.

A key switch power supply is a stable output voltage that uses modern power electronic technology to control the on-off time ratio of key switches. The power supply and the key switch power supply are generally composed of a pulse width modulation (PWM) control chip and a MOSFET. There are two types of push-button switching power supplies compared with linear power supplies. Costs increase with output power, but at different rates. Linear power supplies cost more at a certain output power point. When you push the button to turn on the power, this is called the cost reversal point. With the development and innovation of power electronics technology, the key switching power supply technology no longer exists. Breakthrough innovation, this cost reversal point is increasingly shifting to the low output power end, which provides a broad development space for the key switch power supply. The high frequency of the key switch power supply is its development direction, which makes the key switch power supply miniaturized and makes the key switch power supply more widely used. The application in this field, especially in the high-tech field, promotes the miniaturization and portability of high-tech products. In addition, the development of key switch power supply. Its application is of great significance for saving energy, saving resources and protecting the environment.

The main power electronic devices used in key switch power supplies are. Diodes, IGBTs and MOSFETs. The thyristor is rarely used in the input rectifier circuit and soft start circuit of the key switch power supply, but it is difficult to drive the GTR. The switching frequency is low and is gradually replaced by IGBT and MOSFET. Press the button to toggle the condition of the power supply. Keyswitch: Power electronics operate in a keyswitch state, not a linear state. High Frequency: Power electronic devices operate at high frequencies close to the power frequency rather than low frequencies. DC: The key switch power supply outputs DC instead of AC. Classification of key switch power supply In the field of key switching power supply technology, people have developed related power electronic devices and key switch frequency conversion technology at the same time, and the two promote each other. The key switch power supply is developing in the direction of light, small, thin, low noise, high reliability and anti-interference, and the annual growth rate is more than double digits. button to open. Power outages can be divided into two categories: AC/DC and DC/DC. The modularization of the DC/DC converter has realized the advanced design technology and production technology at home and abroad. It is familiar and standardized, and has been recognized by users, but due to its own characteristics, AC and DC modularization has encountered more problems in the process of modularization. Complex technical and process manufacturing issues.

The structure of the key switch power supply. The structure and characteristics of the two types of key switch power supplies are described below. ground. Keyswitch power supplies generate more interference than linear power supplies. Electrical equipment sensitive to common mode interference should be grounded and shielded. ICE1000, EN61000, FCC and other EMC restrictions, the key switch power supply adopts EMC electromagnetic compatibility measures, so the key switch power supply should generally have. EMC electromagnetic compatibility filter. For example, the HA series key switch power supply of Pilot Huafu Technology can only satisfy the FG terminal grounding wire or the user shell. Electromagnetic compatibility requirements above. protect the circuit. The key switch power supply must have overcurrent, overheating and short circuit protection functions in the design, so the key switch with complete protection function should be preferred in the design. The technical parameters of the power module and its protection circuit should match the working characteristics of the electrical equipment to avoid damage to the electrical equipment or key switches. source. Development Trend The development direction of key switch power supply is high frequency, high reliability, low power consumption, low noise, anti-interference and modularization. Because the key switch power supply is light, small and thin. Its key technology is high frequency, so major foreign key switch power supply manufacturers are committed to the simultaneous development of new high-intelligence components, especially. Improve the loss of the secondary rectifier, increase the scientific and technological innovation of power ferrite (Mn?Zn) materials, and improve the high frequency and high magnetic flux density. High magnetic properties are obtained under (BS), and the miniaturization of capacitors is also a key technology. The application of SMT technology makes the life of key switching power supply longer. After sufficient processing, components are arranged on both sides of the circuit board to ensure that the key switch power supply is light, thin and compact.

The high frequency of key switch power supply is bound to innovate the traditional PWM key switch technology, and the soft key switch technology of ZVS and ZCS has become the mainstream. The mainstream technology of keyed switching power supply greatly improves the working efficiency of keyed switching power supply. For high reliability indicator lights, US key switches. Power supply manufacturers reduce the stress of the device by reducing the operating current and junction temperature, which greatly improves the reliability of the product. Modularization is the general trend in the development of key switch power supplies. The modular power supply can form a distributed power supply system and can be designed as No. 1 redundant power supply. source system to achieve parallel expansion. In view of the disadvantage of high noise in the operation of the key switch power supply, if only high frequencies are pursued, the noise will also increase. It will inevitably increase with the increase, and the use of partial resonance conversion circuit technology can theoretically achieve high frequency and reduce noise, but the use of partial resonance conversion technology. There are still technical difficulties in practical application of this technology, and a lot of work needs to be done to make this technology practical.

Back to list