Power factor control of a cyclo-converter
First Claim
1. A three-phase resonant cyclo-converter comprising a power control module, wherein the power control module is arranged to develop a plurality of repeating switching periods within a cycle of the resonant cyclo-converter, the power control module further arranged to:
- control the length of a first switching period in the cycle to adjust the power flow, and control the relative length of two or more further switching periods in the cycle to adjust the power factor, wherein the relative length is controlled based on a product of voltage values representing at least two mains input phase voltages and current values synthesized from resonant currents associated with at least two of the plurality of repeating switching periods.
2 Assignments
0 Petitions
Accused Products
Abstract
A three-phase resonant cyclo-converter comprising a power control module, wherein the power control module is arranged to develop a plurality of repeating switching periods within a cycle, the power control module further arranged to: control the length of a first switching period in the cycle to adjust the power flow, and control the relative length of two or more further switching periods in the cycle to adjust the power factor, wherein the relative length is controlled based on a cross-product of voltage and current values associated with the further switching periods.
-
Citations
37 Claims
-
1. A three-phase resonant cyclo-converter comprising a power control module, wherein the power control module is arranged to develop a plurality of repeating switching periods within a cycle of the resonant cyclo-converter, the power control module further arranged to:
- control the length of a first switching period in the cycle to adjust the power flow, and control the relative length of two or more further switching periods in the cycle to adjust the power factor, wherein the relative length is controlled based on a product of voltage values representing at least two mains input phase voltages and current values synthesized from resonant currents associated with at least two of the plurality of repeating switching periods.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
-
20. A method of developing a plurality of repeating switching periods within a cycle to control a three-phase resonant cyclo-converter, the method comprising the steps of:
controlling the length of a first switching period in the cycle to adjust the power flow, and controlling the relative length of two or more further switching periods in the cycle to adjust the power factor, wherein the relative length is controlled based on a product of voltage values representing at least two mains input phase voltages and current values synthesized from resonant currents associated with at least two of the plurality of repeating switching periods. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
Specification