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    • 6. 发明授权
    • Method and apparatus for run-time short circuit protection for amplifiers
    • 用于放大器运行时短路保护的方法和装置
    • US08421540B1
    • 2013-04-16
    • US13155100
    • 2011-06-07
    • Anindya Bhattacharya
    • Anindya Bhattacharya
    • H02H7/20
    • H03F1/52H03F3/185H03F3/21H03F2200/03
    • The system contains a first input receiving a signal from the amplifier input. A second input receives a signal from the amplifier output. A gain modification device is connected to the second input thereby reducing an amplitude of the signal from the amplifier output. A difference element connected to the gain modification device and the first input subtracts one of the first input and the second input from the other of the first input and the second input and outputting a difference voltage. A comparator, connected to the difference element and a threshold voltage source, compares the difference voltage to a threshold voltage. A disabling device is connected to the comparator and an output stage of the amplifier, wherein an output stage of the amplifier is disabled when the threshold voltage exceeds the difference voltage.
    • 该系统包含接收来自放大器输入端的信号的第一输入端。 第二输入接收来自放大器输出的信号。 增益修改装置连接到第二输入,从而减小来自放大器输出的信号的幅度。 连接到增益修改装置和第一输入的差分元件从第一输入和第二输入中的另一个中减去第一输入和第二输入中的一个,并输出差分电压。 连接到差分元件和阈值电压源的比较器将差分电压与阈值电压进行比较。 禁用装置连接到比较器和放大器的输出级,其中当阈值电压超过差分电压时,放大器的输出级被禁止。
    • 7. 发明授权
    • Stepped voltage drive for driving capacitive loads
    • 用于驱动电容性负载的步进电压驱动
    • US08575975B1
    • 2013-11-05
    • US12571352
    • 2009-09-30
    • Anindya BhattacharyaJohn Melanson
    • Anindya BhattacharyaJohn Melanson
    • H03K4/02H02M3/18B41J29/38
    • B41J2/04541B41J2/04548B41J2/0455B41J2/04581H03K4/063H03K5/12
    • A system and method for charging heavy capacitive loads may comprise an n-stage stacked charging circuit wherein n is an integer greater than one which may comprise n−1 capacitors and a voltage supply, each sequentially electrically connected to the capacitive load in an order through a respective first through nth switch during a respective first through nth charging time period; the n−1th capacitors each sequentially electrically connected to the capacitive load in reverse order during a first through n−1th discharging time period through the respective n−1th through first switches. The system and method may comprise an n+1th switch electrically connecting the capacitive load to ground during an nth discharging period. The capacitive load may comprise a piezoelectric element, which may comprise an inkjet printer head inkjet actuator.
    • 用于对高容性负载充电的系统和方法可以包括n级堆叠充电电路,其中n是大于1的整数,其可以包括n-1个电容器和电压源,每个电容器和电压源按顺序电连接到电容负载,顺序通过 在相应的第一至第n充电时间段期间相应的第一至第N开关; 在第一到第n-1放电时间段期间,第n-1个电容器通过相应的第n-1个至第一开关以相反顺序电连接到电容性负载。 该系统和方法可以包括在第n个放电周期期间将电容性负载电连接到地的第n + 1开关。 电容性负载可以包括压电元件,其可以包括喷墨打印头喷墨致动器。
    • 8. 发明授权
    • High voltage linear amplifier driving heavy capacitive loads with reduced power dissipation
    • 高电压线性放大器驱动大容量负载,降低功耗
    • US08324943B1
    • 2012-12-04
    • US12571340
    • 2009-09-30
    • Anindya BhattacharyaJohn Melanson
    • Anindya BhattacharyaJohn Melanson
    • H03K5/12H03K17/04B41J29/38
    • B41J2/04541B41J2/04548B41J2/0455B41J2/04581H03K4/063H03K5/12
    • A capacitive load drive circuit may comprise a high current drive amplifier configured to be coupled to a capacitive load during a high current ramp up of the voltage across the capacitive load to a cut off voltage; a low current drive amplifier configured to be connected to the capacitive load during a low current ramp up of the voltage across the capacitive load, from the cut off voltage to a maximum voltage across the capacitive load; and the high current drive amplifier configured to be connected to the capacitive load during a high current ramp down of the voltage across the capacitive load. The low current drive amplifier may be connected to the capacitive load during a period of steady state of the voltage across the capacitive load, intermediate the low current ramp up and the high current ramp down.
    • 容性负载驱动电路可以包括高电流驱动放大器,其被配置为在跨过容性负载的电压的高电流斜坡上升到截止电压时耦合到电容性负载; 低电流驱动放大器被配置为在跨过容性负载的电压的低电流斜升期间从截止电压到跨过容性负载的最大电压连接到电容性负载; 以及高电流驱动放大器,被配置为在跨过容性负载的电压的高电流斜降期间连接到电容性负载。 在电容负载两端的电压稳定期间,低电流驱动放大器可以连接到电容性负载,低电平斜坡上升和高电流斜坡下降。