20v 3.25a 8.0mm 5.0mm Connection for Lenovo PC

20v 3.25a 8.0mm 5.0mm Connection for Lenovo PC

• Switching power supply generally has three working modes: frequency, pulse width fixed mode, frequency fixed, pulse width variable mode, frequency, pulse width variable mode. The former working mode is mostly used for DC/AC inverter power supply, or DC/DC voltage transformation; The latter two working modes are mostly used for switching stabilized power supply. According to the connection mode of switching devices in the circuit, switching power supply can be generally divided into three categories: serial switching power supply, parallel switching power supply and transformer switching power supply. Among them, transformer switching power supply (hereinafter referred to as transformer switching power supply) can be further divided into: push-pull type, half bridge type, full bridge type, etc. According to the excitation of the transformer and the phase of the output voltage, it can be divided into: positive excitation type, flyback type, single excitation type and double excitation type.

• In addition, switching power supply and other power supply, there are two advantages.
  1, small volume, light weight: because there is no power frequency transformer, so the volume and weight of linear power supply only 20 ~ 30%.
  2. Low power consumption and high efficiency: the power transistor works in the on-off state, so the power consumption on the transistor is low and the conversion efficiency is high, generally 60 ~ 70%, while the linear power supply is only 30 ~ 40%.
  
  
• Shenzhen Waweis Technology Co., Ltd. is a high-tech enterprise engaged in r&d, production and sales of notebook adapters. Main: switch power supply, power adapter, charger, LED power supply and other products professional production and processing. The products have passed UL, CE, FCC, KC, PSE, SAA, GS and other certifications. The products produced by the company have perfect protection function, stable performance, safe and reliable. With professional r & d, production and sales experience, the company has accumulated strong technical advantages and rich market resources in the field of power adapters. The company is now able to provide a full range of alternative adapters for the world's major brands of notebook computers.

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