Inchworm-type piezoelectric linear actuators have large displacement and high resolution,but the mechanism of system output force depending on the static friction of clamping mechanism limits the system stiffness and output thrust.

So the dc motor ought to be a clamped motor.

Aimed at the feature that the locality of axis of the armature mmf is determined by the brush in dc motor, a new concept on clamp is proposed.

This converter uses a simple auxiliary circuit without the active switch and lossy components so that the voltage stress of secondary rectifier diode is reduced and the current to charge or discharge clamping capacitance is self-adjusted in accordance with the load.

In development of the power stage for a 2 kVA high frequency on line UPS,methods of anti parallel diode across the serial resistor and active clamps are adopted to reduce the gate voltage spikes over MOS gated inverter power switches during their turn off.

Voltage clamping ZVS push-pull three-level converter;

In DC motor,the locality of axis of armature MMF was determined by the brush position,here the brush possessed a function of clamping.

The zero-voltage soft-switching technology of active clamped single end forward inverter;

Optimizing design of main magnetic devices in an active clamped forword converter;

The method to symmetrically magnetic reset the power transformer with the Boost active clamped circuit and to achieve zero voltage switching through the resonant excitation of power switches parasitic capacitance and inductance is discussed.