PWM method for cycloconverter
View Patent ↗A method of using a cycloconverter switches a first switch of the first topology type to an on state after a magnitude of a current through an output inductor becomes less than a predetermined current threshold, and switches a second switch of the first topology type to an off state a first time after switching the first switch to the on state. The cycloconverter includes nodes on a first port, nodes on a second port, a switch pair coupled between a first node of the first port and a first node of the second port, a switch pair coupled between a second node of the first port and a first node of the second port, a switch pair coupled between a first node of the first port and a second node of the second port, and a switch pair coupled between a second node of the first port and a second node of the second port. Each switch pair includes a switch of each topology type.
1. In a cyclo-converter that includes a first port having first and second nodes, a second port having first and second nodes, a first switch pair coupled between the first node of the first port and the first node of the second port, a second switch pair coupled between the second node of the first port and the first node of the second port, a third switch pair coupled between the first node of the first port and the second node of the second port, and a fourth switch pair coupled between the second node of the first port and the second node of the second port, each switch pair including a switch of a first topology type and a switch of a second topology type in series connection, a method comprising:
switching a first switch of the first topology type to an on state after a magnitude of a current through an output inductor becomes less than a predetermined current threshold; and
switching a second switch of the first topology type to an off state a first predetermined time after switching the first switch of the first topology type to the on state.
2. A method according to claim 1 , wherein:
the voltage on the first node of the first port is positive with respect to the voltage on the second node of the first port;
the first topology type is a P topology and the second topology type is an N topology;
the switching of the first switch of the first topology type switches a P topology switch of the third switch pair; and
the switching of the second switch of the first topology type switches a P topology switch of the fourth switch pair.
3. A method according to claim 1 , wherein:
the voltage on the first node of the first port is positive with respect to the voltage on the second node of the first port;
the first topology type is a P topology and the second topology type is an N topology;
the switching of the first switch of the first topology type switches a P topology switch of the second switch pair; and
the switching of the second switch of the first topology type switches a P topology switch of the first switch pair.
4. A method according to claim 1 , wherein:
the voltage on the first node of the first port is negative with respect to the voltage on the second node of the first port;
the first topology type is a P topology and the second topology type is an N topology;
the switching of the first switch of the first topology type switches a P topology switch of the first switch pair; and
the switching of the second switch of the first topology type switches a P topology switch of the second switch par.
5. A method according to claim 1 , wherein:
the voltage on the first node of the first port is negative with respect to the voltage on the second node of the first port;
the first topology type is a P topology and the second topology type is an N topology;
the switching of the first switch of the first topology type switches a P topology switch of the fourth switch pair; and
the switching of the second switch of the first topology type switches a P topology switch of the third switch pair.
6. A method according to claim 1 further comprising:
switching a first switch of the second topology type to an on state a second predetermined time after switching the second switch of the first topology type to the off state; and
switching a second switch of the second topology type to an off state a third predetermined time after switching the first switch of the second topology type to the on state.
7. A method according to claim 6 , wherein:
the voltage on the first node of the first pot is positive with respect to the voltage on the second node of the first port;
the first topology type is a P topology and the second topology type is an N topology;
the switching of the first switch of the first topology type switches a P topology switch of the third switch pair;
the switching of the second switch of the first topology type switches a P topology switch of the fourth switch pair;
the switching of the first switch of the second topology type switches an N topology switch of the third switch pair; and
the switching of the second switch of the second topology type switches an N topology switch of the fourth switch pair.
8. A method according to claim 6 , wherein:
the voltage on the first node of the first port is positive with respect to the voltage on the second node of the first port;
the first topology type is a P topology and the second topology type is an N topology;
the switching of the first switch of the first topology type switches a P topology switch of the second switch pair;
the switching of the second switch of the first topology type switches a P topology switch of the first switch pair;
the switching of the first switch of the second topology type switches an N topology switch of the second switch pair; and
the switching of the second switch of the second topology type switches an N topology switch of the first switch pair.
9. A method according to claim 6 , wherein:
the voltage on the first node of the first port is negative with respect to the voltage on the second node of the first port;
the first topology type is a P topology and the second topology type is an N topology;
the switching of the first switch of the first topology type switches a P topology switch of the first switch pair;
the switching of the second switch of the first topology type switches a P topology switch of the second switch pair,
the switching of the first switch of the second topology type switches an N topology switch of the first switch pair; and
the switching of the second switch of the second topology type switches an N topology switch of the second switch pair.
10. A method according to claim 6 , wherein:
the voltage on the first node of the first port is negative with respect to the voltage on the second node of the first port;
the first topology type is a P topology and the second topology type is an N topology;
the switching of the first switch of the first topology type switches a P topology switch of the fourth switch pair;
the switching of the second switch of the first topology type switches a P topology switch of the third switch pair;
the switching of the first switch of the second topology type switches an N topology switch of the fourth switch pair; and
the switching of the second switch of the second topology type switches an N topology switch of the third switch pair.
11. A method according to claim 1 wherein the first topology type is an N topology and the second topology type is a P topology.
12. A method according to claim 11 , wherein;
the voltage on the first node of the first port is positive with respect to the voltage on the second node of the first port;
the switching of the first switch of the first topology type switches the N topology switch of the fourth switch pair; and
the switching of the second switch of the first topology type switches the N topology switch of the third switch pair.
13. A method according to claim 11 , wherein:
the voltage on the first node of the first port is positive with respect to the voltage on the second node of the first port;
the switching of the first switch of the first topology type switches the N topology switch of the first switch pair; and
the switching of the second switch of the first topology type switches the N topology switch of the second switch pair.
14. A method according to claim 11 , wherein:
the voltage on the first node of the first port is negative with respect to the voltage on the second node of the first port;
the switching of the first switch of the first topology type switches the N topology switch of the second switch pair and the switching of the second switch of the first topology type switches the N topology switch of the first switch pair.
15. A method according to claim 11 , wherein:
the voltage on the first node of the first port is negative with respect to the voltage on the second node of the first port;
the switching of the first switch of the first topology type switches the N topology switch of the third switch pair; and
the switching of the second switch of the first topology type switches the N topology switch of the fourth switch pair.
16. A method according to claim 6 , wherein the first topology type is an N topology and the second topology type is a P topology.
17. A method according to claim 16 , wherein:
the voltage on the first node of the first port is positive with respect to the voltage on the second node of the first port;
the switching of the first switch of the first topology type switches the N topology switch of the fourth switch pair;
the switching of the second switch of the first topology type switches the N topology switch of the third switch pair;
the switching of the first switch of the second topology type switches the P topology switch of the fourth switch pair; and
the switching of the second switch of the second topology type switches the P topology switch of the third switch pair.
18. A method according to claim 16 , wherein:
the voltage on the first node of the first port is positive with respect to the voltage on the second node of the first port;
the switching of the first switch of the first topology type switches the N topology switch of the first switch pair;
the switching of the second switch of the first topology type switches the N topology switch of the second switch pair;
the switching of the first switch of the second topology type switches the P topology switch of the first switch pair; and
the switching of the second switch of the second topology type switches the P topology switch of the second switch pair.
19. A method according to claim 16 , wherein:
the voltage on the first node of the first port is negative with respect to the voltage on the second node of the first port;
the switching of the first switch of the first topology type switches the N topology switch of the second switch pair;
the switching of the second switch of the first topology type switches the N topology switch of the first switch pair;
the switching of the first switch of the second topology type switches the P topology switch of the second switch pair; and
the switching of the second switch of the second topology type switches the P topology switch of the first switch pair.
20. A method according to claim 16 , wherein:
the voltage on the first node of the first port is negative with respect to the voltage on the second node of the first port;
the switching of the first switch of the first topology type switches the N topology switch of the third switch pair;
the switching of the second switch of the first topology type switches the N topology switch of the fourth switch pair;
the switching of the first switch of the second topology type switches the P topology switch of the third switch pair; and
the switching of the second switch of the second topology type switches the P topology switch of the fourth switch pair.
21. A method according to claim 11 , wherein:
the voltage on the first node of the first port is positive with respect to the voltage on the second node of the first port;
the switching of the first switch of the first topology type switches an N topology switch of the first switch pair; and
the switching of the second switch of the first topology type switches an N topology switch of the second switch pair.
22. A method according to claim 11 , wherein:
the voltage on the first node of the first port is positive with respect to the voltage on the second node of the first port;
the switching of the first switch of the first topology type an N topology switch of the fourth switch pair, and
the switching of the second switch of the first topology type switches an N topology switch of the third switch pair.
23. A method according to claim 11 , wherein:
the voltage on the first node of the first port is negative with respect to the voltage on the second node of the first port;
the switching of the first switch of the first topology type switches an N topology switch of the third switch pair; and
the switching of the second switch of the first topology type switches an N topology switch of the fourth switch pair.
24. A method according to claim 11 , wherein:
the voltage on the first node of the first port is negative with respect to the voltage on the second node of the first port;
the switching of the first switch of the first topology type switches an N topology switch of the second switch pair; and
the switching of the second switch of the first topology type switches an N topology switch of the first switch pair.
25. A method according to claim 16 , wherein:
the voltage on the first node of the first port is positive with respect to the voltage on the second node of the first port;
the switching of the first switch of the first topology type switches an N topology switch of the first switch pair;
the switching of the second switch of the first topology type switches an N topology switch of the second switch pair;
the switching of the first switch of the second topology type switches a P topology switch of the first switch pair; and
the switching of the second switch of the second topology type switches a P topology switch of the second switch pair.
26. A method according to claim 16 , wherein:
the voltage on the first node of the first port is positive with respect to the voltage on the second node of the first port;
the switching of the first switch of the first topology type switches an N topology switch of the fourth switch pair;
the switching of the second switch first topology type switches an N topology switch of the third switch pair;
the switching of the first switch of the second topology type switches a P topology switch of the fourth switch pair; and
the switching of the second switch of the second topology type switches a P topology switch of the third switch pair.
27. A method according to claim 16 , wherein:
the voltage on the first node of the first port is negative with respect to the voltage on the second node of the first port;
the switching of the first switch of the fist topology type switches an N topology switch of the third switch pair;
the switching of the second switch of the first topology type switches an N topology switch of the fourth switch pair;
the switching of the first switch of the second topology type switches a P topology switch of the third switch pair; and
the switching of the second switch of the second topology type switches a P topology switch of the fourth switch par.
28. A method according to claim 16 , wherein:
the voltage on the first node of the first port is negative with respect to the voltage on the second node of the first port;
the switching of the first switch of the first topology type switches an N topology switch of the second switch pair;
the switching of the second switch of the first topology type switches an N topology switch of the first switch pair;
the switching of the first switch of the second topology type switches a P topology switch of the second switch pair; and
the switching of the second switch of the second topology type switches a P topology switch of the first switch pair.
29. A computer readable medium embodying a computer program product, said program product comprising:
a cyclo-converter control program, the cyclo-converter control program configured to:
switch a first switch of a first topology type to an on state after a magnitude of a current through an output inductor becomes less than a predetermined current threshold; and
switch a second switch of the first topology type to an off state a first predetermined time after switching the first switch of the first topology type to the on state.
30. A computer readable medium according to claim 29 , wherein the first topology type is a P topology and the second topology type is an N topology.
31. A computer readable medium according to claim 29 , wherein the first topology type is an N topology and the second topology type is a P topology.
32. A computer readable medium according to claim 29 , the cyclo-converter control program further configured to:
switch a first switch of a second topology type to an on state a second predetermined time after switching the second switch of the first topology type to the off state; and
switch a second switch of the second topology type to an off state a third predetermined time after switching the first switch of the second topology type to the on state.
33. A computer readable medium according to claim 32 , wherein the first topology type is a P topology and the second topology type is an N topology.
34. A computer readable medium according to claim 32 , wherein the first topology type is an N topology and the second topology type is a P topology.