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US 11,637,502 B2Granted
Startup process for a dual active bridge converter to prevent over-voltage failure and thermal run-away
AssigneeDeere & Company
InventorsBrij N. Singh, Tianjun Fu, Zachary Wehri
Life of this patent
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Abstract
A system and method for controlling a dual active bridge based DC/DC converter. A controller implements a startup control scheme and DC bus pre-charge routine to prevent damage to the converter upon startup. During startup of the converter, the startup control process can be used to prevent excessive phase-shift and the DC bus pre-charge routine adjusts the pulse width modulated duty cycle by increasing the dead time between signals, resulting in a decreased DC bus capacitor.
Claims11
A system for controlling a direct current to direct current converter comprising:
- a primary converter, the primary converter comprising a plurality of primary switches, the primary converter having a primary direct current terminal and a primary alternating current terminal;
- a secondary converter, the secondary converter comprising a plurality of secondary switches, the secondary converter having a secondary direct current terminal and a secondary alternating current terminal;
- a transformer, the transformer comprising a primary winding coupled to the primary alternating current terminal and secondary winding coupled to the secondary alternating current terminal;
- a current sensor associated with at least one of the primary alternating current terminal and the secondary alternating current terminal for measuring an alternating current;
- an estimator configured to estimate a direct current at the secondary direct current terminals based on the measured alternating current;
- a controller capable of operating in a startup mode and an operational mode,
- wherein the controller is configured to provide pulse width modulated primary control signals to control terminals of the primary switches in accordance with target phase offsets, wherein the primary control signals are provided prior to providing control signals to the secondary converter, and
- wherein the controller is further configured to delay providing secondary control signals to the secondary converter until the estimated direct current achieves an operational current that is below an initial startup current.
5 more elements
Dependencies are inferred from the claim text.