Wuxi Derun Electronics Co., Ltd. is located in the Yangtze River Delta with beautiful scenery, developed economy and convenient transportation. The company was founded in April 2004 and now has a monthly output of 5 million pcs of products. It specializes in R&D, manufacturing and sales of various high frequency transformers, low frequency transformers, inductor coils and other electronics products.
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Common-mode inductors are electrical inductor devices used to suppress electromagnetic interference (EMI). Their main function is to prevent common-mode noise signals from entering the system. The magnitude of the inductance of a common-mode inductor is not necessarily the larger the better; instead, it needs to be selected based on the specific application scenario and system requirements. If the inductance of the common-mode inductor is too small, it may not be able to effectively suppress the common-mode noise signal, thereby affecting the performance and stability of the system. However, if the inductance of the common-mode inductor is too large, it may cause the frequency response of the circuit to deteriorate, thereby affecting the transmission performance of the system. Moreover, an excessively large common-mode inductor will also increase the cost and volume of the system. Therefore, when selecting common-mode inductors, it is necessary to determine the appropriate inductance based on the specific application scenario and system requirements. Generally speaking, the suitable common-mode inductors can be selected based on factors such as the system's operating frequency, noise environment, output load, etc. At the same time, the quality factor, DC resistance and other parameters of the common-mode inductors also need to be considered to ensure their performance and stability in the system.
High-frequency transformers are the most important component of a switching power supply. Switching power supplies typically employ a half-bridge power conversion circuit. During operation, two switching transistors alternate to conduct, generating 100kHz high-frequency pulse waves. These waves are then reduced in voltage through a high-frequency transformer, resulting in low-voltage alternating current. The number of turns in each winding of the high-frequency transformer determines the output voltage. In a typical half-bridge transformer circuit, the three most prominent high-frequency transformers are the main transformer, the driver transformer, and the auxiliary transformer (standby transformer). Each transformer has its own measurement specifications as stipulated by the country. For example, the main transformer must have a core diameter (height) of no less than 35mm for any power supply above 200W. For the auxiliary transformer, a core diameter of 16mm is sufficient when the power of the power supply does not exceed 300W. A transformer is a device that transforms alternating voltage, current and impedance. When an alternating current flows through the primary coil, an alternating magnetic flux is generated in the iron core (or magnetic core), inducing a voltage (or current) in the secondary coil. A transformer consists of an iron core (or magnetic core) and coils. The coils have two or more windings. The winding connected to the power supply is called the primary winding, and the remaining windings are called secondary windings.
1. Frequency converter: A frequency converter is used to convert high-frequency signals into low-frequency signals. A frequency converter typically consists of a frequency conversion circuit, which achieves the frequency conversion by altering the parameters of the components in the circuit or by controlling the signals. 2. Step-down Transformer: By adding one or more stages of step-down transformers, high-frequency signals can be gradually reduced to the desired low-frequency signals. The winding ratio and core design of each stage transformer can enable the output frequency to be lowered while maintaining efficient energy transmission. 3. Electronic Frequency Conversion Technology: Using an electronic frequency converter to convert the high-frequency alternating current power supply into the desired low-frequency signal. The electronic frequency converter achieves frequency adjustment by adjusting the switching frequency and duty cycle of the switching elements in the power supply.
