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This paper investigates the behavior of piezoelectric stacks in a Piezoelectric Actuator Drive (PAD) motor, which shows non-linear equivalent impedance and has a dramatic impact on the overall system performance. Therefore, in this paper, the piezo stackt's model is discussed and an improved large signal model is proposed and verified by measurement. Finally, a Class-D amplifier as a power driver...
This paper presents the design of a modified StrongArm regenerative comparator in 0.13-μm CMOS technology, operating at a supply voltage of 200-mV. The comparator uses a pair of cross-coupled P-type transistors to replace the conventional cross-coupled inverters, improving the comparison time and voltage headroom. A robust S-R latch is proposed to solve the race condition which occurs when the S-R...
This paper presents a digital control technique to achieve valley switching in a bidirectional flyback converter used to drive a dielectric electro active polymer based incremental actuator. The incremental actuator consists of three electrically isolated, mechanically connected capacitive actuators. The incremental actuator requires three high voltage (∼2.5 kV) bidirectional DC-DC converters, to...
Transformer parameters such as leakage inductance and self-capacitance are rarely calculated in advance during the design phase, because of the complexity and huge analytical error margins caused by practical winding implementation issues. Thus, choosing one transformer architecture over another for a given design is usually based on experience or a trial and error approach. This work presents equations...
Flyback converters are widely used in several applications, however, with this topology it is very challenging to achieve high voltage operation especially with very high step-up ratio (>500) within limited space. This paper presents a new flyback-based topology which utilizes primary parallel and secondary series transformer connection in order to achieve very high step-up ratio (up to 650) as...
Micro-inverters convert direct current (DC) from a single solar panel to alternating current (AC). Peak current control is a simple way to regulate the output current of the micro-inverter. In this way, the shape of the current reference will determine the total harmonics distortion (THD) of the output line current. However, several factors like valley switching turn-on delay and equivalent capacitor...
An interleave buck converter with coupled inductor is proposed in this paper. Continuous input current, low input and output ripple current, good transient response are realized with the proposed converter. Detailed analyses and simulations are presented. Experimental results meet them very well.
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