Pfc circuits with very low thd
AssigneeOne More Time LLC
InventorDonald F. Partridge
Life of this patent
Estimating the term…
Abstract
A boost chopper circuit is described that an alternating current (AC) power source; at least one inductor connected to said AC power source; a rectifier connected to said inductor and AC power source; at least one switch shorting our said rectifier; a series circuit connected in parallel with said switch of at least one diode and a capacitor; and a load connected in parallel with said capacitor. A control technique is employed that includes turning on and off the switch in order to keep the average current per pulse cycle proportional to the AC input voltage during the same pulse cycle.
Claims22
1-11. (canceled)
A power factor correction circuit to operate in a discontinuous current mode comprising:
- three single phase full-wave rectifiers;
- three capacitors across respective first and second inputs of the three single-phase full-wave rectifiers;
- a three-phase alternating current power source connected to respective second inputs of the three single-phase full-wave rectifiers;
- respective first inputs of the single-phase full-wave rectifiers shorted together;
- three series circuits of a primary of a transformer and a switching device connected in parallel with respective outputs of the three single-phase full-wave rectifiers;
- three transformer secondaries;
- anodes of three diodes connected to the respective three transformer secondaries;
- cathodes of the three diodes shorted together as a first short;
- respective other sides of the three secondaries shorted together as a second short;
- a load capacitor connected between the first short and the second short;
- a load connected in parallel with the load capacitor;
- a fixed frequency fixed pulse width generator to turn on and off the three switching devices;
- wherein the fixed frequency fixed pulse width generator pulse width is varied to control a load voltage.
A power factor correction circuit to operate in a discontinuous current mode comprising:
- a three-phase alternating current (AC) power source;
- three capacitors star-connected across the three-phase AC power source;
- three sources of the three-phase AC power source connected to respective center taps of three transformer primaries;
- anodes of three first diodes connected to respective first ends of the three center-tapped primaries;
- cathodes of the three first diodes shorted together and denoted as a first short;
- cathodes of three second diodes connected to the respective second ends of the three center-tapped primaries;
- anodes of the three second diodes shorted together and denoted as a second short;
- a switching device connected between the first short and the second short;
- three transformer secondaries;
- anodes of three third diodes connected to the respective three transformer secondaries;
- cathodes of the three third diodes shorted together as a third short;
- respective other sides of the three secondaries shorted together as a fourth short;
- a load capacitor connected between the third short and the fourth short;
- a load connected in parallel with the load capacitor;
- a fixed frequency fixed pulse width generator to turn on and off the switching device;
- wherein the fixed frequency fixed pulse width generator pulse width is varied to control a load voltage.
A power factor correction circuit to operate in a discontinuous current mode comprising:
- a three-phase alternating current (AC) power source;
- three sources of the three-phase AC power connected respective first ends of primaries of three transformers;
- second ends of the three primaries connected to respective inputs of a three-phase bridge;
- a switching device in parallel with an output of the three-phase bridge;
- three transformer secondaries having respective full-wave center-tapped rectifiers;
- outputs of the three full-wave center-tapped rectifiers connected in parallel;
- a load capacitor in parallel with the outputs of the three full-wave center-tapped rectifiers;
- a load connected in parallel with the load capacitor;
- a fixed frequency fixed pulse width generator to turn on and off the switching device;
- wherein the fixed frequency fixed pulse width generator pulse width is varied to control a load voltage.
Dependencies are inferred from the claim text.