| Switching Power, Inc. Patent applications |
| Patent application number | Title | Published |
|---|
| 20120008355 | PASSIVE THREE PHASE INPUT CURRENT HARMONIC REDUCTION AND POWER FACTOR CORRECTION CIRCUIT FOR POWER SUPPLIES - A harmonic input current reduction and power factor correction circuit for three phase, power supplies. The circuit includes passive elements including a series inductance and capacitor connected between each AC line of a three phase voltage source, and each input phase of the uncorrected power supply. The inductance and capacitor are designed and chosen to meet linearity and volt ampere requirements to achieve total harmonic current levels of less than 10%, and power factors greater than 0.98. This is achieved with less than 1% loss in line operating input voltage range and overall efficiency of greater than 99.5%. Further, the dynamic response of a circuit to power supply load transient demands is limited in voltage overshoot or undershoot effects. | 01-12-2012 |
| 20090154203 | AC to DC power supply having zero low frequency harmonic contents in 3-phase power-factor-corrected output ripple - An AC-DC power supply circuit utilizing an output stage configuration designed to achieve no output ripple at the power line frequency. To eliminate the ripple formed, each separate processing output stage corresponding to a respective ac voltage source phase which provides a 120 Hz ripple, is stacked, in a series connection, and due to their respective ripple phase shifts of 120° degrees, achieves ripple cancellation at the output. | 06-18-2009 |
