Voltage link control of a dc-ac boost converter system

Abstract

Systems and methods are disclosed for a DC boost converter. The systems and methods combine operation of an inductor with the input capacitor of a DC/AC inverter via a switch configuration to power the DC/AC inverter. The switch configuration is controlled by a plurality of control signals generated by a controller based on a variety of control modes, and feedback signals.

1 . A method for boosting a DC voltage, the method comprising:
 determining a control mode;   generating a plurality of control signals and feedback signals in response to the control mode;   operating a plurality of switches in order to control flow of an electrical current from an electrical voltage source through an inductor, and into an inverter based on the control signals and the feedback signals;   producing, in response to the control signals and the feedback signals, a plurality of AC outputs for powering a load; and   delivering power to the load via the inverter.   
     
     
         2 . The method according to  claim 9 , further comprising modulating the plurality of control signals to represent pulse-width modulated signals. 
     
     
         3 . The method according to  claim 9 , wherein the control mode corresponds to an operating state that allows a recharging current flow to the electrical voltage source. 
     
     
         4 . The method according to  claim 9 , wherein producing a plurality of AC outputs is based on a first set of duty cycles for the plurality of switches. 
     
     
         5 . The method according to  claim 9 , wherein controlling flow of the electrical current is based on a second duty cycle for the plurality of switches. 
     
     
         6 . The method according to  claim 9 , wherein controlling flow of the electrical current produces a voltage with a high modulation index. 
     
     
         7 . The method according to claim  14 , wherein the high modulation index is greater than about 0.9. 
     
     
         8 . The method according to  claim 9 , wherein controlling flow of the electrical current produces a voltage that is higher than the voltage of an electrical voltage source that is coupled to the inverter. 
     
     
         9 . A DC boost converter comprising:
 a first DC output;   a second DC output;   an inductor having a first end and a second end;   a first switch coupled between the second end and the second DC output; and   a second switch coupled between the second end and the first DC output.   
     
     
         10 . The DC boost converter according to claim  17 , further comprising a diode coupled between the second end and the first DC output, wherein the diode is configured to allow current flow from the boost converter.