Electronic device control system and method
View Patent ↗There is provided a system and method for controlling an electronic device. An exemplary method comprises employing a look-up table to derive waveform value data for a multi-phase reference waveform. The exemplary method also comprises employing the look-up table to derive waveform value data corresponding to harmonic data for the multi-phase reference waveform. Harmonic data is injected into the multi-phase reference waveform to produce a harmonic reference waveform. The exemplary method additionally comprises generating a plurality of control signals from the harmonic reference waveform.
1. A method of producing a plurality of control signals to control an electronic device, the method comprising:
iterating a look-up table sequentially in time in accordance with a first iteration sequence to derive waveform value data for a multi-phase reference waveform, wherein the first iteration sequence is determined by a number of output phases of the plurality of control signals;
iterating the look-up table sequentially in time in accordance with a second iteration sequence to derive waveform value data corresponding to harmonic data for the multi-phase reference waveform, wherein the second iteration sequence is determined by a number of inverters to be controlled by the plurality of control signals;
injecting the harmonic data into the multi-phase reference waveform to produce a harmonic reference waveform; and
generating the plurality of control signals from the harmonic reference waveform.
2. The method recited in claim 1 , comprising driving a plurality of inverters with the plurality of control signals.
3. The method recited in claim 1 , comprising accessing the look-up table at different points using an index that corresponds to a phase difference of the multi-phase reference waveform to obtain the waveform value data to create the plurality of control signals.
4. The method recited in claim 1 , wherein the harmonic data comprises third harmonic data of a fundamental frequency of the multi-phase reference waveform.
5. The method recited in claim 1 , comprising synchronizing the plurality of control signals based on a synchronization signal received from an external processor.
6. The method recited in claim 1 , wherein the plurality of control signals comprise pulse-width modulated commands to an inverter.
7. The method recited in claim 6 , comprising extending a duration of the pulse-width modulated commands.
8. The method recited in claim 6 , wherein a duration of the pulse-width modulated commands is extended by a dead time.
9. An inverter control system, comprising:
a storage medium that stores a look-up table containing waveform value data; and
a control circuit configured to:
iterate the look-up table sequentially in time in accordance with a first iteration sequence to derive waveform value data for a multi-phase reference waveform, wherein the first iteration sequence is determined by a number of output phases of the inverter control system;
iterate the look-up table sequentially in time in accordance with a second iteration sequence to derive waveform value data corresponding to harmonic data for the multi-phase reference waveform, wherein the second iteration sequence is determined by a number of inverters to be controlled by the inverter control system;
inject the harmonic data into the multi-phase reference waveform to produce a harmonic reference waveform; and
generate a plurality of control signals from the harmonic reference waveform.
10. The inverter control system recited in claim 9 , comprising driving a plurality of inverters with the plurality of control signals.
11. The inverter control system recited in claim 9 , comprising accessing the look-up table at different points using an index that corresponds to a phase difference of the multi-phase reference waveform to obtain the waveform value data to create the plurality of control signals.
12. The inverter control system recited in claim 9 , wherein the harmonic data comprises third harmonic data of a fundamental frequency of the multi-phase reference waveform.
13. The inverter control system recited in claim 9 , comprising synchronizing the plurality of control signals based on a synchronization signal received from an external processor.
14. The inverter control system recited in claim 9 , wherein the plurality of control signals comprise pulse-width modulated commands to an inverter.
15. The inverter control system recited in claim 14 , comprising extending a duration of the pulse-width modulated commands.
16. The inverter control system recited in claim 14 , wherein a duration of the pulse-width modulated commands is extended by a dead time.