Restart of an AC-to-DC converter upon a temporary drop-out of an AC voltage
AssigneeTexas Instruments Incorporated
InventorJongwan Kim
Life of this patent
Estimating the term…
Abstract
A method of converting an alternating current (AC) voltage to a direct current (DC) voltage by an AC-to-DC converter. The method includes producing an AC virtual waveform approximately synchronized to the AC voltage. The method further includes detecting a cessation of the AC voltage, continuing to produce the AC virtual waveform during the cessation of the AC voltage, and detecting a resumption of the AC voltage. Upon detecting the resumption of the AC voltage, the method includes applying the AC virtual waveform to a control loop implemented by the AC-to-DC converter for a period of time, and after the period of time, the method includes applying an output of a phase-locked loop to the control loop instead of the AC virtual waveform.
Claims19
A method of converting an alternating current (AC) voltage to a direct current (DC) voltage by an AC-to-DC converter, the method comprising:
- producing an AC virtual waveform approximately synchronized to the AC voltage;
- detecting a cessation of the AC voltage;
- continuing to produce the AC virtual waveform during the cessation of the AC voltage;
- detecting a resumption of the AC voltage;
- upon detecting the resumption of the AC voltage, applying the AC virtual waveform to a control loop implemented by the AC-to-DC converter for a period of time;
- and
- after the period of time, applying an output of a phase-locked loop to the control loop instead of the AC virtual waveform.
A non-transitory storage device containing software that, when executed by a processor, causes the processor to:
- produce an AC virtual waveform approximately synchronized to an AC voltage;
- detect a cessation of the AC voltage;
- continue to produce the AC virtual waveform during the cessation of the AC voltage;
- detect a resumption of the AC voltage;
- upon detecting the resumption of the AC voltage, apply the AC virtual waveform to a control loop implemented by an AC-to-DC converter for a period of time;
- and
- after the period of time, apply an output of a phase-locked loop to the control loop instead of the AC virtual waveform.
A control unit comprising:
- a non-transitory storage device containing software;
- a processor coupled to the non-transitory storage device, the processor configured to execute the software contained in the non-transitory storage unit, and upon executing the software, the processor is configured to:
- produce an AC virtual waveform approximately synchronized to an AC voltage;
- detect a cessation of the AC voltage;
- continue to produce the AC virtual waveform during the cessation of the AC voltage;
- detect a resumption of the AC voltage;
- upon detecting the resumption of the AC voltage, apply the AC virtual waveform to a control loop implemented by an alternating current (AC)-to-direct current (DC) converter for a period of time;
- and
- after the period of time, apply an output of a phase-locked loop to the control loop instead of the AC virtual waveform.
Dependencies are inferred from the claim text.