System, method and apparatus for controlling converters using input-output linearization

摘要

A system, method and apparatus for controlling boost and buck-boost converters using input-output linearization and leading-edge modulation is provided. The controller includes a summing circuit connected to the converter to create a third voltage representing a difference between the first voltage and the second voltage. A gain circuit is connected to the summing circuit to adjust the third voltage by an appropriate gain. A modulating circuit is connected to the gain circuit, the converter, the first voltage, the second voltage and the second current to create a control signal based on the first voltage, the second voltage, the adjusted third voltage, the fourth voltage and the first current. The control signal is used to control the converter. Typically, the first voltage is a converter output voltage, the second voltage is a reference voltage, the fourth voltage is a converter input voltage, and first current is a converter inductor current.

主权项

1. A method for controlling a boost converter, having a voltage source to which an inductor is connected at a first polarity, the inductor having inductance L and parasitic resistance RS further connected to a diode S2 at a first node, a load resistor of resistance R connected in series to diode S2 at a second node and to the voltage source at a second polarity, a switch S1 connected in parallel with the load resistance and diode S2 at the first node, a capacitor of capacitance C and equivalent resistance Rc connected in parallel with the load resistor at the second node, the method using a PWM modulator/controller and comprising the steps of:
receiving a first voltage y from an output of the boost converter, a second voltage y0 from a reference voltage source, a first current x1 from an inductor within the boost converter and a fourth voltage u0 from the voltage source providing an input voltage to the boost converter at the PWM modulator/controller; creating a third voltage representing a difference between the first voltage from the output of the boost converter and the second voltage from the reference voltage source; adjusting the third voltage by a gain k; creating a control signal that provides leading-edge modulation with input-output linearization based on the first voltage from the output of the boost converter, the second voltage from the reference voltage source, the adjusted third voltage, the fourth voltage from the voltage source or the input of the converter, and the first current from the inductor within the boost converter, wherein the control signal has a duty cycle d defined byd=(RRc⁢C+L)⁢y-(L-Rs⁢Rc⁢C)⁢Rx1-RRc⁢Cu0+(R+Rc)⁢LCk⁡(y0-y)R⁡(Rc⁢Cy-LRR+Rc⁢x1);and controlling the boost converter using the control signal created by the PWM modulator/controller.