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2. 发明申请

WO2006130608A2 DISK DRIVE FLY HEIGHT CONTROL BASED ON CONSTANT POWER DISSIPATION IN READ/WRITE HEAD HEATERS 审中-公开
标题翻译：基于读/写头加热器中恒定功耗的磁盘驱动器飞行高度控制
公开(公告)号：WO2006130608A2
公开(公告)日：2006-12-07
申请号：PCT/US2006020971
申请日：2006-05-31
申请人： TEXAS INSTRUMENTS INC , BRANNON CRAIG M , RANMUTHU INDUMINI W , TAN SIANG TONG
发明人： BRANNON CRAIG M , RANMUTHU INDUMINI W , TAN SIANG TONG
CPC分类号： G11B5/60 , G11B5/6064
摘要： A fly height controller (40) circuit for a disk drive head having a resistive heater is disclosed. The fly height controller includes an error amplifier (44) that controls a variable current source (46) driving the resistive heater. The error amplifier compares a desired heater power signal with a feedback power signal that is generated by a multiplier (50). The multiplier receives a signal corresponding to the resistive heater current, for example as generated by a second variable current source also controlled by the error amplifier, and a signal corresponding to a voltage across the resistive heater. A first differential amplifier develops a differential voltage corresponding to the heater voltage. A second differential amplifier is biased by the resistive heater current signal, and receives the differential voltage form the first differential amplifier. A differential current generated by the second differential amplifier produces the feedback power signal as an output voltage.
摘要翻译：公开了一种用于具有电阻加热器的磁盘驱动器头的飞行高度控制器（40）电路。飞行高度控制器包括控制驱动电阻式加热器的可变电流源（46）的误差放大器（44）。误差放大器将期望的加热器功率信号与由乘法器（50）产生的反馈功率信号进行比较。乘法器接收对应于电阻加热器电流的信号，例如由也由误差放大器控制的第二可变电流源产生的信号和对应于电阻加热器两端的电压的信号。第一差分放大器产生对应于加热器电压的差分电压。第二差分放大器由电阻加热器电流信号偏置，并从第一差分放大器接收差分电压。由第二差分放大器产生的差分电流产生反馈功率信号作为输出电压。

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