PID-type Drive Circuit Design and Implementation for Improving MOSFET Switching Delay
Date Issued
2011
Date
2011
Author(s)
Wang, Chia-Wei
Abstract
This thesis applies the method from control systems and realizes MOSFET gate drive as PID controllers to improve MOSFET’s turn-on delay time and Drain Current rising time. In the realization the PID controller, inverter, and summing junction circuit are implemented with TI’s operational amplifier OPA2690. In addition, the MOSFET IPA086N10N3 by Infrineon is used as the tested plant. The square wave signals generated by a function generator are utilized to simulate the input signal or the PWM controller IC’s output signal.
Firstly, based on the signal switching characteristics of the MOSFET plant, a linear model is constructed. Then, a controller design method is applied to derive a PID controller that meets the specifications of the transient and steady-state responses. The software Matlab is used to simulate time and frequency responses. Via the time response curves, it can be judged approximately if the controller improves the transient response and steady-state errors effectively. The frequency response curves are also examined to see if the controller is receptive to noise interference. Moreover, the PSPICE is adopted to simulate the PID controller circuit, with previously designed parameters substituted in, to evaluate the controller’s performance. Finally, the controller circuit is actually implemented to verify the design results.
The results of this thesis show that, compared with the traditional gate drive circuit, the PID controller based MOSFET drive circuit is much safer and guarantees MOSFET to be operated under the fully turned-on condition. Compared with the direct drive circuit, there are also a few advantages, such as reduced turn-on delay time and Drain Current rising time, and lower power loss due to the MOSFET switching process. These advantages enable the system to be operable at higher frequencies. In the applications of power supply units and other power electronics it is helpful to shrink the sizes of energy storage components.
Subjects
Gate Drive Circuit
Turn-on delay time
PID Controller
Type
thesis
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