Voltage link control of a DC-AC boost converter system
View Patent ↗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 DC boost converter system, the system comprising:
an inverter comprising a first DC input, a second DC input, a plurality of AC outputs, and a plurality of first control inputs, wherein the plurality of AC outputs are configured to be coupled to a load;
a boost converter coupled to a first node, the first DC input, and the second DC input, the boost converter comprising a plurality of second control inputs, wherein the boost converter is configured to be coupled to a DC voltage source at the first node and the second DC input;
a capacitor coupled between the first DC input and the second DC input; and
a controller coupled to the plurality of first control inputs and the plurality of second control inputs, the controller being configured to receive a plurality of first feedback signals from the inverter, and a plurality of second feedback signals from the boost converter, and the controller being configured to control current flow through the boost converter and the inverter.
2. The system according to claim 1 , wherein the inverter comprises a single source multi-phase inverter.
3. The system according to claim 1 , wherein the boost converter comprises:
an inductor coupled between the first node and a second node;
a first switch coupled between the second node and the second DC input, and controlled by one of the plurality of second control inputs; and
a second switch connected between the second node and the first DC input, and controlled by another one of the plurality of second control inputs.
4. The system according to claim 1 , wherein the controller is further configured to control duty cycles of the plurality of first control inputs and the plurality of second control inputs.
5. The system according to claim 1 , further comprising a multi-phase load coupled to the plurality of AC outputs.
6. The system according to claim 1 , wherein the boost converter is configured to produce a voltage with a high modulation index on the first DC input and the second DC input of the inverter.
7. The system according to claim 6 , wherein the high modulation index is greater than 0.9.
8. The system according to claim 1 , wherein the boost converter is configured to produce a voltage that is higher than the voltage of the DC voltage source.