High voltage direct current power generator for computer server data centers
View Patent ↗Some embodiments include a high voltage direct current (HVDC) power generator system for information technology (IT) racks. The HVDC power generator system can include a three-phase alternating current (AC) transformer having a primary winding and a plurality of secondary windings. A plurality of three-phase bridge rectifier circuits can be electrically coupled respectively to the plurality of secondary windings. The HVDC power generator system can include output terminals for powering its load. A first string of bridge rectifier circuits can be in series with each other and a first inductor. A second string of bridge rectifier circuits can be in series with each other and a second inductor. The first and second strings can be electrically coupled in parallel to the output terminals.
1. A high voltage direct current (HVDC) power generator, comprising:
output terminals for powering a load of the HVDC power generator;
a three-phase alternating current (AC) transformer having a primary winding and two secondary windings;
a pair of three-phase bridge rectifier circuits electrically coupled respectively to the two secondary windings, wherein the pair of three-phase bridge rectifier circuits are electrically coupled in parallel with each other; and
an interphase reactor circuit between the pair of three-phase bridge rectifier circuits, the interphase reactor circuit comprising at least: a first inductor, a second inductor, and a third inductor in series, a common core, a first diode electrically coupled between the first inductor and the second inductor, and a second diode electrically coupled between the second inductor and the third inductor,
wherein a positive terminal of the output terminals is electrically coupled to cathode terminals of the first diode and the second diode.
2. The HVDC power generator of claim 1 , wherein the primary winding is a three-phase delta configuration winding.
3. The HVDC power generator of claim 1 , wherein the secondary windings include a three-phase delta configuration winding, a three-phase Y-configuration winding, and at least two different extended delta configuration windings.
4. The HVDC power generator of claim 1 , wherein the first diode and the second diode are Schottky diodes.
5. The HVDC power generator of claim 1 , further comprising a first transistor electrically coupled in parallel to the first diode and a second transistor electrically coupled in parallel to the second diode.
6. The HVDC power generator of claim 5 , wherein the first transistor and the second transistor are metal oxide semiconductor (MOS) transistors.
7. The HVDC power generator of claim 5 , further comprising active circuitry to maintain a voltage on gate terminals of the first transistor and the second transistor such that the first transistor and the second transistor are switched on.
8. The HVDC power generator of claim 1 , further comprising a plurality of inductors coupled respectively to input phases of the three-phase AC transformer.
9. The HVDC power generator of claim 1 , further comprising a plurality of capacitors coupled respectively between pairs of input phases of the three-phase AC transformer.
10. The HVDC power generator of claim 1 , further comprising a capacitor electrically coupled between the output terminals.
11. The HVDC power generator of claim 1 , further comprising a grounding voltage divider circuit electrically coupled between the output terminals.