公开(公告)号：US08193854B2

公开(公告)日：2012-06-05

申请号：US12651993

申请日：2010-01-04

申请人： Xiao Fei Kuang ,  Kam Chuen Wan ,  Kwai Chi Chan ,  Yat To (William) Wong ,  Kwok Kuen (David) Kwong

发明人： Xiao Fei Kuang ,  Kam Chuen Wan ,  Kwai Chi Chan ,  Yat To (William) Wong ,  Kwok Kuen (David) Kwong

IPC分类号： G05F3/02

CPC分类号： G05F3/30 ,  H01C17/22

摘要： A bandgap reference circuit has trimming-up resistors and trimming-down resistors for bi-directional trimming. PNP transistors have base and collectors grounded and emitters connected to parallel resistors. A difference resistor drives an inverting input of an op amp that drives a transistor that generates the bandgap reference voltage Vbg. A sensing resistor connects Vbg to a splitting node that connects to the non-inverting input through a first parallel resistor. The splitting node also connects through a second parallel resistor to the inverting input. Fuses or switches enable the trimming-up and trimming-down resistors. The trimming-up resistors are in series with the sensing resistor and the trimming-down resistors are in series with an output resistor that connects Vbg to reference voltage Vref. The circuit can be designed for a more typical process since bi-directional trimming allows Vref to be raised or lowered. Many circuits need no trimming when targeted for the typical process.

摘要翻译： 带隙参考电路具有用于双向修剪的微调电阻和微调电阻。 PNP晶体管的基极和集电极接地，发射极连接到并联电阻。 差分电阻驱动驱动产生带隙参考电压Vbg的晶体管的运算放大器的反相输入。 感测电阻器将Vbg连接到通过第一并联电阻器连接到非反相输入的分离节点。 分离节点还通过第二并联电阻器连接到反相输入端。 保险丝或开关使能微调和微调电阻。 修整电阻与感测电阻串联，并且减法电阻与将Vbg连接到参考电压Vref的输出电阻串联。 该电路可以设计用于更典型的工艺，因为双向修整允许Vref被升高或降低。 许多电路在针对典型过程时不需要修剪。

公开(公告)号：US07710094B1

公开(公告)日：2010-05-04

申请号：US12333979

申请日：2008-12-12

申请人： Yat To William Wong ,  Xiao Fei Kuang ,  Kam Chuen Wan ,  Kwok Kuen David Kwong

发明人： Yat To William Wong ,  Xiao Fei Kuang ,  Kam Chuen Wan ,  Kwok Kuen David Kwong

IPC分类号： G05F1/00 ,  G05F3/02 ,  G05F3/16

CPC分类号： H02M3/156 ,  G01R19/0092 ,  H02M2001/0009

摘要： A power converter has a power transistor driving a power current through an inductor to provide a controlled power-supply voltage. The power transistor is on during a first state but off during a second state when a sink transistor reduces the power current through the inductor. Both voltage sensing of the power-supply voltage and current sensing at the power transistor provide feedback to control the amount of time that the first state is active, and thus control the power current. Current sensing is provided by a smaller minor transistor in parallel with the power transistor. The minor transistor turns on after the power transistor to reduce disturbance spikes. Switches connect sources of the power and mirror transistors to an amplifier that drives a sensing transistor. The sensing transistor generates a sensing voltage from the mirror transistor source. During the second state the amplifier's inputs are equalized to provide fast response.

摘要翻译： 功率转换器具有驱动通过电感器的功率电流以提供受控的电源电压的功率晶体管。 功率晶体管在第一状态期间导通，而在第二状态期间，当晶体管晶体管降低通过电感器的功率电流时，功率晶体管截止。 在功率晶体管处的电源电压和电流感测的两个电压检测提供反馈以控制第一状态是有效的时间量，从而控制功率电流。 电流感测由与功率晶体管并联的较小次级晶体管提供。 次晶体管在功率晶体管之后导通，以减少干扰尖峰。 将电源和镜像晶体管的源极连接到驱动感测晶体管的放大器。 感测晶体管产生来自反射镜晶体管源的感测电压。 在第二状态期间，放大器的输入被均衡以提供快速响应。