A High-voltage and High-power Amplifier for Driving Piezoelectric Stack Actuators

Abstract

Aiming at the strong capacitive impedance of piezoelectric stack actuators, the principle to improve the dynamic performance of piezoelectric stack actuators through increasing the peak values of the output current and output power of power amplifiers are explored. Based on the error-amplified principle, the method that enlarges the output voltage of the dynamic power amplifiers through using a high-voltage operational amplifier in series with the power booster section, as well as the method that improves the peak values of the output current and output power through paralleling multiple power booster units utilizing the class AB quasi-complementary symmetry power amplifier circuits, are proposed and analyzed. Utilizing the proposed principle and method, a high-voltage and high-power amplifier for driving piezoelectric stack actuators is developed, simulated, and tested. The research results indicate that the developed power amplifier not only can break through the limit that each single power booster unit can only achieve the power output <125 W, but also can disperse the current and power averagely among the power booster units in parallel, which are beneficial to realizing the high power output with good static and dynamic performance and enhancing the reliability of the power amplifier.

A fast low-cost analog amplifier suitable for driving piezoelectric actuator

“…The peak power and the charge and discharge current provided to and from the PZT actuator by the analog amplifier can be expressed as: Where P W is the peak value of output power, and P I is the peak value of the charge or discharge current, and C I is the total charge current and D I is the total discharge current. According to Equations (7), (8) and (9), the peak output current and the peak output power of the power amplifier can be increased through multiple paralleling power booster units [7]. Each power booster unit is provided a current limiter circuit to protect MOSFETs from destroyed by over current.…”

Linearization of Stack Piezoelectric Ceramic Actuators Based on Bouc-Wen Model

“…Most of SPCAs are driven by using voltage drivers as the power amplifiers (Wang et al, 2009). Newcomb and Flinn (1982) considered that the linearization of SPCAs could be achieved with the electric charge driver rather than the voltage driver.…”

Efficiency of the class B-CE and class B-CC high-voltage wideband amplifiers with a capacitive load

“…for excitation of ultrasonic actuators and transmitters ( [1], [2], [5], [6] etc) for special ultrasonic nondestructive testing measurements [9]. There are demands for high voltage output (c. 200-400Vp-p) and wide passband up to 10 MHz for full output voltage range as power bandwidth.…”

“…A realization of amplifier stage with low voltage input and high voltage output is problem. It has two basic solutions: (a) the use of transformers [1], [3], [5], [6] or (b) without the use of transformers [2], [7], [10].…”