一种三电平开关功率放大器，属于电压－电流型开关功率放大器。包括信号混合处理电路，脉宽调制电路，保护和光耦隔离驱动电路，以及将来自控制器的信号进行处理得到相应的电压信号驱动桥式电路，从而控制负载的电流大小。双极性功率放大器无偏置电流，功率损耗更小，适用于磁悬浮轴承和磁悬浮列车等需要控制负载电流的场合。
... lead limit switch 引先限位开关；行程限位开关 level switch 电平开关；钳拉电平转换；箝位电平开关 lever switch 杠杆操纵开关；杠杆开关 ...
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实验与仿真结果表明：该系统采用音频开关而不导致电机负载的音频噪声，同时使EMI能被限制在低电平。
Experiments and simulations show that the proposed system can operate in audio switch frequency range without audio noise from the motor load, meanwhile, EMI can be limited to low level.
“最大信号电平”是指能够切换但又不会损坏开关卡的电压、电流和功率的最大值。
"Maximum signal levels" refers to the highest levels of voltage, current, and power that can be switched without damaging the switch card.
作为技术指标，如果在最大信号电平下采用冷切换而非热切换，那么触点寿命将会从105次开关次数延长至108次开关次数。
As the specifications state, if cold switching is used instead of hot switching at maximum signal levels, contact life is extended from 105 closures to 108 closures.
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