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    • 21. 发明申请
    • ADAPTIVE ON-TIME CONTROL FOR POWER FACTOR CORRECTION STAGE LIGHT LOAD EFFICIENCY
    • 功率因数校正阶段光负载自适应接通时间控制
    • US20120014148A1
    • 2012-01-19
    • US13184788
    • 2011-07-18
    • Qian LiFred C. LeeMing XuChuanyun Wang
    • Qian LiFred C. LeeMing XuChuanyun Wang
    • H02M1/00
    • H02M1/4216H02M1/4225H02M1/44H02M2001/0032H02M2003/1586Y02B70/126Y02B70/16Y02P80/112
    • Light load efficiency of a power factor correction circuit is improved by adaptive on-time control and providing for selection between a continuous conduction mode and a discontinuous conduction mode wherein the discontinuous conduction mode increases time between switching pulses controlling connection of a cyclically varying voltage to a filter/inductor that delivers a desired DC voltage and thus can greatly reduce the switching frequency at light loads where switching frequency related losses dominate efficiency. The mode for controlling switching is preferably selected for each switching pulse within a half cycle of the cyclically varying input voltage. A multi-phase embodiment allows cancellation of EMI noise at harmonics of the switching frequency and adaptive change of phase angle allows for cancellation of dominant higher order harmonics as switching frequency is reduced.
    • 通过自适应导通时间控制来提高功率因数校正电路的轻负载效率,并提供连续导通模式和不连续导通模式之间的选择,其中不连续导通模式增加了控制周期性变化的电压连接到开关脉冲之间的时间 滤波器/电感器提供所需的直流电压,因此可以大大降低开关频率相关损耗占优势的轻负载时的开关频率。 优选地,在循环变化的输入电压的半周期内针对每个开关脉冲选择用于控制切换的模式。 多相实施例允许在开关频率的谐波处消除EMI噪声,并且由于开关频率降低,相位角的自适应变化允许抵消主要高阶谐波。
    • 28. 发明申请
    • Method and Device for Monitoring Computer Case and Power Supply Unit
    • 电脑机箱和电源单元监控方法及装置
    • US20070233402A1
    • 2007-10-04
    • US11568527
    • 2005-07-12
    • Qian Li
    • Qian Li
    • G01B3/00G01R19/00
    • G06F1/206Y02D10/16
    • The present invention disclosed a method and device for monitoring computer case and power supply unit. Expanding monitor chip acts as slave device of SMBus to form the monitor device on the SMBus of computer integrated master device to measure the fan speed, temperature and working voltage of the computer case and power supply unit. Once the temperature signal received by temperature sensor and input to the monitor chip, it will processed by the monitor chip then outputs a control signal to control the fan speed via an amplifying driver circuit. The SMBus is connected with the connection head of the SMBus of PCI Express board, PCI board, PCI-X board and/or computer mainboard. With the method and device in the present invention, a smart computer case and power supply unit may be formed to reduce noise and power consumption. By monitoring working status via a program by the communication between SMBus and computer, it helps with better management of computer case and power supply unit device.
    • 本发明公开了一种用于监视计算机外壳和电源单元的方法和装置。 扩展监控芯片作为SMBus的从设备,在计算机集成主设备的SMBus上形成监控设备,以测量计算机机箱和电源单元的风扇速度,温度和工作电压。 一旦由温度传感器接收到的温度信号并输入到监视器芯片,它将由监视器芯片处理,然后通过放大驱动器电路输出控制信号来控制风扇转速。 SMBus与PCI Express板,PCI板,PCI-X板和/或计算机主板的SMBus的连接头连接。 通过本发明的方法和装置,可以形成智能计算机外壳和电源单元以降低噪声和功耗。 通过SMBus和计算机之间的通信通过程序监控工作状态,有助于更好地管理计算机机箱和电源单元设备。