Method, apparatus and article for bi-directional DC/DC power conversion
View Patent ↗A controller implements a state machine for operating the bi-directional power converter with a flexible load pattern while maintaining a thermal condition of the power converter within acceptable limits. The state machine implements a wait loop in response to selected conditions to maintain the thermal condition.
1. A computer-readable memory medium storing instructions for causing a control system to control a power converter by:
monitoring command and condition signals; and
selectively supplying control signals to cause the power converter to cycle between a plurality of operational modes based on the monitored command and condition signals, the plurality of operational modes comprising:
a ready mode;
a buck mode;
a boost mode;
a fault mode;
a first wait mode during which power transfer is disabled; and
a second wait mode comprising a duration different than the first wait mode during which power transfer is disabled.
2. The computer-readable memory medium of claim 1 , wherein the stored instructions further comprise instructions for causing the control system to control the power converter by:
selectively generating control signals to cause the power converter to cycle from the boost mode to the first wait mode; and
selectively generating control signals to cause the power converter to cycle from the boost mode to the second wait mode.
3. The computer-readable memory medium of claim 1 wherein the stored instructions further comprise instructions for causing the control system to control the power converter by:
selectively supplying control signals to cause the power converter to cycle from the boost mode to the first wait mode in response to an indication of a thermal condition.
4. The computer-readable memory medium of claim 3 wherein the indication of a thermal condition is a function of an input current.
5. The computer-readable memory medium of claim 1 , wherein the stored instructions include instructions for causing the control system to supply control signals to cause the power converter to cycle from the boost mode to the first wait mode when an integrated value of an input current exceeds a threshold input current by a defined value.
6. The computer-readable memory medium of claim 1 , wherein the stored instructions include instructions for causing the control system to supply control signals to cause the power converter to operate in the fault mode in response to detection of a fault condition.
7. The computer-readable memory medium of claim 1 , wherein the stored instructions include instructions for causing the control system to supply control signals to cause the power converter to operate in the first wait mode for a first defined period of time and selectively supplying control signals to cause the bi-directional power converter to operate in the second wait mode for a second defined period of time.