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    • 3. 发明授权
    • Discharge lamp igniting apparatus for performing a feedback control of a
discharge lamp and the like
    • 用于进行放电灯的反馈控制的放电灯点火装置等
    • US5910713A
    • 1999-06-08
    • US129848
    • 1998-08-06
    • Kenichiro NishiSatoshi NagaiKentaro EguchiTakeshi AraiJun BunyaKazutaka ShimizuKoji ShibataIsamu Ogawa
    • Kenichiro NishiSatoshi NagaiKentaro EguchiTakeshi AraiJun BunyaKazutaka ShimizuKoji ShibataIsamu Ogawa
    • H05B37/03H05B41/285H05B41/292H05B41/392G05F1/00
    • H05B41/2851H05B37/03H05B41/2855H05B41/2925H05B41/3921Y02B20/208Y10S315/04
    • A current flowing through a discharge lamp 4 is detected by a current detecting circuit 5, and the detected current is outputted as a lamp current signal A to a feedback control circuit 7 where a difference between the lamp current signal A and the dimming control signal B is obtained and amplified, and then a amplified signal D is outputted to an adder 12 which adds the amplified signal D to the dimming control signal B to constitute a control signal E. The control signal is fed back to a high frequency power supply 2. When a comparing circuit 15 detects that the light level of the dimming control signal B with respect to the full light becomes higher than or equal to 40% to 60%, the feedback circuit is disconnected by operating a switch 13 provided between an error amplifying circuit 9 and an adder 12 to stop the feedback control. When a light level of a discharge lamp 104 is smaller than or equal to a predetermined value, first and second reference voltage 108a and 108b are switched by a two-stage switching circuit 109. A comparator 107 compares a detection voltage 106 of the discharge lamp 104 with the first reference voltage 108a, or the detection voltage 106 with the second reference voltage 108b. When the voltage of the discharge lamp 104 becomes high, a control circuit 110 supplies to a high frequency power supply 102, a control signal 112 for interrupting, or reducing an output of the high frequency power supply 102.
    • 通过电流检测电路5检测流过放电灯4的电流,将检测电流作为灯电流信号A输出到反馈控制电路7,反馈控制电路7将灯电流信号A与调光控制信号B 然后将放大信号D输出到加法器12,加法器12将放大的信号D与调光控制信号B相加,构成控制信号E.控制信号反馈给高频电源2。 当比较电路15检测到调光控制信号B相对于全光的光电平变得高于或等于40%至60%时,通过操作设置在误差放大电路之间的开关13来断开反馈电路, 9和加法器12,以停止反馈控制。 当放电灯104的亮度小于或等于预定值时,第一和第二参考电压108a和108b由两级切换电路109切换。比较器107比较放电灯104的检测电压106 104具有第一参考电压108a,或具有第二参考电压108b的检测电压106。 当放电灯104的电压变高时,控制电路110向高频电源102提供控制信号112,用于中断或降低高频电源102的输出。
    • 4. 发明申请
    • MOTOR DRIVE CIRCUIT
    • 电机驱动电路
    • US20120161687A1
    • 2012-06-28
    • US13330983
    • 2011-12-20
    • Takeshi AraiAkira Suzuki
    • Takeshi AraiAkira Suzuki
    • G05B5/01
    • H02P25/034H03H17/04
    • A motor-drive circuit includes: a filter circuit to attenuate a frequency band including a resonance frequency of an actuator in a target-current signal, the target-current signal corresponding to a digital signal indicative of a target value of a driving current; a digital-analog converter to convert an output signal of the filter circuit into an analog signal, to be outputted as a current-control signal; and a driving circuit to supply the driving current to the voice-coil motor in accordance with the current-control signal, the filter circuit including: a digital notch filter; and a digital low-pass filter, wherein either one of the digital notch filter and the digital low-pass filter configured to be inputted with the target-current signal, the other one of the digital notch filter and the digital low-pass filter configured to be inputted with an output signal of the one of the digital notch filter or the digital low-pass filter.
    • 电机驱动电路包括:滤波电路,用于衰减包括目标电流信号中的致动器的谐振频率的频带,对应于指示驱动电流的目标值的数字信号的目标电流信号; 数模转换器,将滤波电路的输出信号转换为模拟信号,作为电流控制信号输出; 以及根据电流控制信号向音圈电动机提供驱动电流的驱动电路,该滤波电路包括:数字陷波滤波器; 以及数字低通滤波器,其中数字陷波滤波器和数字低通滤波器中的任一个被配置为输入目标电流信号,另一个数字陷波滤波器和数字低通滤波器被配置 输入数字陷波滤波器或数字低通滤波器之一的输出信号。