Shi-Peng Huang

Sliding-mode controlled Cuk switching regulator with fast response and first-order dynamic characteristic

SMC (sliding-mode control) is successfully applied to the Cuk power converter. It results in a high-performance switching regulator with fast response and first-order dynamic characteristic and with an extremely strong ability to suppress the line-voltage and the load-current disturbances of both small and large signals, even with nonpulsating input and output currents. The performance of the SMC Cuk regulator is determined by its feedback gains. Other high-order power stages, such as the augmented boost and augmented buck converters and the buck converter with input filter, could also be handled by SMC to obtain a high-performance, closed-loop system.<<ETX>>

Class-E combined-converter by phase-shift control

A class-E combined converter using phase-shift control is proposed that can be easily regulated for both wide load and wide line-voltage variations while the switching frequency and the tank resonant frequency are both fixed. A steady-state analysis is presented. Good performance is verified by experiments.<<ETX>>

Function control-a novel strategy to achieve improved performance of the DC-to-DC switching regulators

The control strategy of the DC-to-DC switching converters is studied to obtain the switching regulators with zero-voltage regulation. A novel control strategy, the function control, is presented for the DC-to-DC switching convertors to achieve this objective. The control law and the corresponding feedbacks are derived directly from the equations governing the switching converters. With the function control strategy presented, the switching regulators become robust, i.e. the output is independent of the disturbances from either the supply voltage or the load and exhibit other advantages. The strategy is applicable to all the four basic PWM converters, i.e. buck, boost, buck-boost and Cuk. The analysis is confirmed by experiments and computer simulations.<<ETX>>

New PWM switched-mode converter topologies

Two augmented switching cells are proposed from which four novel topologies can be derived: an augmented buck converter, and augmented boost converter, a novel switching power amplifier, and a novel switching controlled rectifier. The augmented buck and the augmented boost converters realize higher step-down and step-up ratios, respectively, under a given switch duty ratio by proper design of the turn ratios of the transformer and coupled inductor. The switching power amplifier achieves four-quadrant output by the use of two bidirectional current switches and a single power supply, while the inverse converter can be used as a switching controlled rectifier. The experimental verification of the power amplifier is presented.<<ETX>>

Function control and its application in DC-DC switching regulators

A control strategy for a DC-DC switching regulator is studied from the viewpoint of the mathematical relation between the inputs and the outputs of the control circuit. A function control is suggested by which the regulator is inherently stable and the effects of the disturbances from the line voltage and the load resistance can be eliminated and greatly reduced, respectively. The control circuit is simple and flexible. An experimental function-control buck regulator is breadboarded to verify the analysis.<<ETX>>

Function control: a novel strategy to achieve improved performance of the DC-to-DC switching regulators

The control strategy of the DC-to-DC switching converters is studied to obtain the switching regulators with zero-voltage regulation. A novel control strategy, the function control, is presented for the DC-to-DC switching convertors to achieve this objective. The control law and the corresponding feedbacks are derived directly from the equations governing the switching converters. With the function control strategy presented, the switching regulators become robust, i.e. the output is independent of the disturbances from either the supply voltage or the load and exhibit other advantages. The strategy is applicable to all the four basic PWM converters, i.e. buck, boost, buck-boost and Cuk. The analysis is confirmed by experiments and computer simulations. >

New strategy of function control and its application to DC-AC inverter system

A novel function control strategy is proposed, and its control law is deduced. The analyses are suitable for both large-signal and small-signal disturbances. The DC-AC regulator obtained by using the control shows inherent stability, fast response, no overshoot, and high robustness. The excellent performance is verified by experiments.<<ETX>>

High frequency high order quasi-square-wave converters

The quasi-square-wave switching technique is extended to develop the Nth ( N>or=2) order quasi-square-wave converters (QSWCs). The existing QSWCs are unified as the special case of N being 2 in a set of the Nth QSWCs. It is determined that the odd-order QSWCs (i.e. N=3, 5, 7. . .etc.) are not in the set. As an example, a 4th buck ZVS-QSWC is analyzed and breadboarded.<<ETX>>