公开(公告)号：US20060028150A1

公开(公告)日：2006-02-09

申请号：US10911703

申请日：2004-08-05

Applicant: Mark Vitunic ,  Steven Martin

Inventor： Mark Vitunic ,  Steven Martin

IPC: H05B41/24

CPC classification number: H05B33/0815 ,  H05B33/0827

Abstract: High efficiency drive circuitry for a group of parallel-connected light emitting devices, in which each device is driven in series by a respective source of bias current. The maximum voltage drop among the group of biased light emitting devices is determined and in response, a control voltage to drive all the light emitting device at the lowest effective voltage for the LED group is produced.

公开(公告)号：US5859518A

公开(公告)日：1999-01-12

申请号：US996084

申请日：1997-12-22

Applicant: Mark Vitunic

Inventor： Mark Vitunic

IPC: H02P25/08 ,  H02P1/46

CPC classification number: H02P6/185 ,  H02P25/089

Abstract: A controller for a switched reluctance motor that does not utilize a sensor for detecting the rotational position of the rotor. The inductance of each field winding changes according to the rotational position of the rotor. The rotational position of the rotor of the motor is determined by measuring the inductance of each phase during periods when a minimum level of inductance for the phase is expected to occur. A series of voltage pulses are applied to the appropriate field winding during the appropriate period while the current produced in response to the voltage pulses is measured. The relationship between applied voltage, measured current, and time, is utilized to determine the inductance value as it decreases and then increases between positions of rotor alignment. Commutation to a next phase is performed based upon the measured inductance values. More particularly, a first voltage pulse is applied to an appropriate field winding after a commutation and a level of current induced by the voltage pulse is stored across a capacitor. Then, subsequent current levels produced by subsequent voltage pulses are compared to a predetermined threshold. The predetermined threshold ensures that the rotor is not stationary during the measurements. Once a current level exceeds the predetermined threshold, subsequent current levels are compared to the stored level. Upon a subsequent measured value which does not exceed the stored value, commutation to a next phase is performed. The number of degrees of rotation between removing the excitation voltage from a phase and alignment of the rotor with the corresponding phase is the phase advance. The phase advance is adjusted by controlling an offset value utilized for comparing the current levels to the stored value.

Abstract translation: 用于开关磁阻电动机的控制器，其不利用用于检测转子的旋转位置的传感器。 每个励磁绕组的电感根据转子的旋转位置而变化。 电机转子的旋转位置是通过在预期发生相位的最小电感电平的周期内测量每相的电感来确定的。 在适当的周期内，对适当的励磁绕组施加一系列电压脉冲，同时测量响应于电压脉冲产生的电流。 施加电压，测量电流和时间之间的关系用于确定电感值随着其减小然后在转子对准的位置之间增加。 基于所测量的电感值进行下一阶段的换向。 更具体地，在换向之后将第一电压脉冲施加到适当的励磁绕组，并且由电压脉冲感应的电流电平存储在电容器两端。 然后，将随后的电压脉冲产生的后续电流水平与预定阈值进行比较。 该预定阈值确保在测量期间转子不是静止的。 一旦电流电平超过预定阈值，则将后续电流电平与存储电平进行比较。 在不超过存储值的后续测量值的情况下，执行到下一阶段的换向。 从相位去除激励电压和转子与对应相位的对准之间的旋转角度数是相位超前。 通过控制用于将当前电平与存储值进行比较的偏移值来调整相位超前。

公开(公告)号：US20060226898A1

公开(公告)日：2006-10-12

申请号：US11091467

申请日：2005-03-29

Applicant: Mark Vitunic ,  Edward Henderson

Inventor： Mark Vitunic ,  Edward Henderson

IPC: H03F1/02

CPC classification number: H05B33/0848 ,  H05B33/0815 ,  Y02B20/347

Abstract: Novel circuitry and methodology are provided for correcting the offset associated with a voltage-controlled current source. An offset correction circuit is coupled to the current source to prevent the output current produced by the current source from deviating from a desired level. The current source may include a transconductance amplifier or a chopper amplifier, and may be configured to produce a zero or non-zero value of the output current.

Abstract translation: 提供了用于校正与压控电流源相关联的偏移的新型电路和方法。 偏移校正电路耦合到电流源以防止由电流源产生的输出电流偏离期望的电平。 电流源可以包括跨导放大器或斩波放大器，并且可以被配置为产生输出电流的零或非零值。