Yu Yang Magnetic Co., Ltd.

1. Inductor​​ ​Functional characteristics: It uses the electromagnetic induction between the coil winding and the magnetic core to store magnetic field energy and create obstacles (inductive reactance) to the AC signal. It is mainly used for filtering, energy storage, resonance and impedance matching. ​Core advantages: fast response speed (microsecond level), high energy conversion efficiency (>90%), stable voltage/current resistance characteristics; different inductances (μH to H level) and currents (mA to kA level) can be customized by adjusting the number of turns, magnetic core materials (such as ferrite, silicon steel, iron powder core) and structures (such as ring, rod, I-shaped). ​Typical applications: power supply filtering (ripple suppression), DC-DC converter (energy storage and freewheeling), RF circuit (resonance matching), motor drive (suppression of back electromotive force). 2. Common Mode Inductor Functional characteristics: Symmetrical winding inductor designed for common mode interference (two wires with the same phase noise to the ground), using the high impedance characteristics of the magnetic core to the common mode current to suppress electromagnetic interference (EMI), while allowing the differential mode signal (normal transmission signal) to pass with low loss. Core advantages: high common mode rejection ratio (CMRR), low differential mode insertion loss, strong resistance to high frequency noise (frequency range can reach MHz to GHz); the magnetic core is mostly made of high permeability soft magnetic materials (such as manganese zinc ferrite, nickel zinc ferrite) to optimize high frequency response. Typical applications: power ports (AC/DC input lines), signal transmission lines (USB, HDMI, Ethernet), EMC rectification of electronic equipment (meeting CISPR, FCC and other standards). 3. High Frequency Transformer Functional characteristics: A transformer that works at high frequencies (above 10kHz-1MHz) that achieves voltage conversion (boost/buck), electrical isolation, and energy transmission through electromagnetic coupling. Its core advantages are small size, high efficiency (>95%), and low high-frequency loss (core materials are mostly nanocrystals and ferrites). Core advantages: High-frequency design reduces volume (volume is inversely proportional to frequency), suitable for high-frequency scenarios such as switching power supplies, wireless charging, and inverters; supports customized turns ratios, core structures (such as EE, EI, and RM types), and temperature rise control (-40°C to 125°C). Typical applications: switching power supplies (DC-DC conversion), wireless charging transmitters (energy coupling), inverters (DC to AC), and LED driver power supplies (isolated constant current). ​4. Power Transformer​​ ​Functional characteristics​: Transformers dedicated to power conversion, mainly realizing AC voltage step-up and step-down (such as 220V to 12V/24V), with core requirements of high reliability, low loss and wide voltage adaptability (supporting input voltage fluctuations). ​Core advantages​: Silicon steel sheet (low iron loss) or amorphous alloy (ultra-low iron loss) core is used to reduce no-load loss; windings use multi-strand wire or Litz wire (reduce skin effect) to improve current carrying capacity under high frequency; meet safety certification (such as UL, CE, GB). ​Typical applications​: Home/industrial power adapters, power system distribution (distribution transformer), new energy power generation (photovoltaic inverter front-stage isolation). ​5. SMD Inductor​​ ​Functional characteristics​: Inductors made of surface mount (SMT) technology, with miniaturization and high integration, suitable for automated production line assembly; divided into winding type (high power), stacked type (high frequency) and thin film type (ultra-high frequency) according to structure. ​Core advantages: compact size (micro packages such as 0402 to 2012), suitable for high-density PCB layout; wound chip inductors can carry large currents (1A to 10A), and stacked inductors have excellent high-frequency characteristics (high Q value, frequency can reach 100MHz). ​Typical applications: power management of consumer electronics such as mobile phones/tablets (DC-DC step-down), TWS earphone charging boxes (small volume energy storage), automotive electronics (ECU power modules). ​6. SMD Transformer​​ ​Functional characteristics: high-frequency transformers with SMT process, high integration, small parasitic parameters, suitable for scenes with limited space; magnetic cores are mostly planar structures (such as planar E-type, LL-type), optimizing high-frequency magnetic circuit distribution. ​Core advantages: small size (such as 1608, 3216 packages), suitable for high-density mounting; low leakage inductance design (reduce electromagnetic interference), high coupling coefficient (improve energy transmission efficiency); support customized turns ratio (such as 1:1, 1:2) and current specifications (mA to A level). ​Typical applications: mobile phone fast charging (wireless charging transmitter), IoT devices (low-power power isolation), car cameras (high-voltage isolated power supply). ​7. Filter​​ ​Functional characteristics: through the combination of inductors, capacitors and other components, the specific frequency components in the signal are attenuated or suppressed to achieve signal purification; according to the function, they are divided into low-pass (LPF), high-pass (HPF), band-pass (BPF) and band-stop (BRF) filters. ​Core advantages: accurate frequency response (customizable cut-off frequency), controllable insertion loss (adjustable in dB level), strong anti-interference ability; can be integrated with common-mode inductors, magnetic beads, etc. to form a composite filtering solution. ​Typical applications: power supply noise suppression (such as switching power supply output ripple filtering), communication signal conditioning (mobile phone RF front-end filtering), audio equipment (noise elimination), industrial sensors (anti-electromagnetic interference).