# US 2013/0278193 A1 · Direct current generating, management and distribution system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0278193 A1 - Document ID: US20130278193A1 - Status: Published application - Kind: A1 - Application number: 13/454,554 - Filed: 2012-04-24 - Published: 2013-10-24 - Earliest claimed: 2012-04-24 - Assignees: Hamilton Sundstrand Corporation - Inventors: Gregory I. Rozman; Jacek F. Gieras; Steven J. Moss - Web page: https://patentgrep.com/patent/US20130278193A1 ## CPC - H02J 1/082: DC supplies with two or more different DC voltage levels - H02J 4/25: for transfer of electric power between AC and DC networks, e.g. for supplying the DC section within a load from an AC mains system - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY ## Abstract A direct current generating, management and distribution system includes a first armature winding, a first active rectifier having a first controller and coupled to the first armature winding, a first direct current bus coupled to the first active rectifier, a second armature winding, a second active rectifier having a second controller and coupled to the second armature winding, a second direct current bus coupled to the second active rectifier, a unit controller coupled to the first and second controllers, a first set of switches coupled to the first direct current bus and to the unit controller, a second set of switches coupled to the second direct current bus and to the unit controller, a third switch coupled to the first direct current bus and to the unit controller and a fourth switch coupled to the second direct current bus and the unit controller. ## Claims ### Claim 1 A direct current (DC) generating, management and distribution system, comprising: a first armature winding; a first active rectifier having a first controller and coupled to the first armature winding; a first DC bus coupled to the first active rectifier; a second armature winding; a second active rectifier having a second controller and coupled to the second armature winding; a second DC bus coupled to the second active rectifier; a unit controller coupled to the first and second controllers; a first set of switches coupled to the first DC bus and to the unit controller; a second set of switches coupled to the second DC bus and to the unit controller; a third switch coupled to the first DC bus and to the unit controller; and a fourth switch coupled to the second DC bus and the unit controller. ### Claim 2 (depends on 1) The system as claimed in claim 1 wherein the first and second set of switches are coupled to a DC load. ### Claim 3 (depends on 2) The system as claimed in claim 2 wherein the third and fourth switches are coupled to a dedicated motor load. ### Claim 4 (depends on 3) The system as claimed in claim 3 wherein the unit controller is configured to communicate current conditions of the DC load and the dedicated motor load to the first and second controllers. ### Claim 5 (depends on 1) The system as claimed in claim 1 wherein the first controller is configured to power cycle the first active rectifier in response to overload conditions detected by the unit controller, thereby switching a state of the first set of switches and the third switch. ### Claim 6 (depends on 1) The system as claimed in claim 1 wherein the second controller is configured to power cycle the second active rectifier in response to overload conditions detected by the unit controller, thereby switching a state of the fourth switch. ### Claim 7 (depends on 6) The system as claimed in claim 6 wherein the second set of switches are silicon controlled rectifiers (SCR), each SCR having a holding current. ### Claim 8 (depends on 7) The system as claimed in claim 7 wherein turning-off the second active rectifier reduces a current through each of the SCRs, and discharges the second DC bus. ### Claim 9 (depends on 8) The system as claimed in claim 8 wherein the SCRs power off in response to the current through the SCRs falling below the holding current. ### Claim 10 (depends on 1) The system as claimed in claim 1 wherein the first set of switches, the third switch and the fourth switch are silicon carbide (SiC) metal on silicon field effect transistors (MOSFET). ### Claim 11 A direct current (DC) generating, management and distribution system, comprising: a permanent magnet synchronous machine; a power management and distribution unit; a first active rectifier disposed between the permanent magnet synchronous machine and the power management and distribution unit via a first DC bus; a second active rectifier disposed between the permanent magnet synchronous machine and the power management and distribution unit via a second DC bus; a DC load coupled to the power management and distribution unit; and a dedicated motor load coupled to the power management and distribution unit, wherein the power management and distribution unit is configured to power cycle the first and second active rectifiers in response to overload conditions of the DC load and dedicated motor load. ### Claim 12 (depends on 11) The system as claimed in claim 11 wherein the first active rectifier includes a first controller and the second active rectifier includes a second controller. ### Claim 13 (depends on 12) The system as claimed in claim 12 wherein the power management and distribution unit comprises: a unit controller coupled to the first and second controllers; a first set of switches coupled to the first DC bus and to the unit controller; a second set of switches coupled to the second DC bus and to the unit controller; a third switch coupled to the first DC bus and to the unit controller; and a fourth switch coupled to the second DC bus and the unit controller. ### Claim 14 (depends on 13) The system as claimed in claim 13 wherein the first and second set of switches are coupled to a DC load. ### Claim 15 (depends on 14) The system as claimed in claim 14 wherein the third and fourth switches are coupled to a dedicated motor load. ### Claim 16 (depends on 15) The system as claimed in claim 15 wherein the unit controller is configured to communicate current conditions of the DC load and the dedicated motor load to the first and second controllers. ### Claim 17 (depends on 13) The system as claimed in claim 13 wherein the first controller is configured to power cycle the first active rectifier in response to overload conditions detected by the unit controller, thereby switching a state of the first set of switches and the third switch. ### Claim 18 (depends on 13) The system as claimed in claim 13 wherein the second controller is configured to power cycle the second active rectifier in response to overload conditions detected by the unit controller, thereby switching a state of the fourth switch. ### Claim 19 (depends on 13) The system as claimed in claim 13 wherein the second set of switches are silicon controlled rectifiers (SCR), and wherein the first set of switches, the third switch and the fourth switch are silicon carbide (SiC) metal on silicon field effect transistors (MOSFET). ### Claim 20 A direct current (DC) bus management method, comprising: in response to an overload condition in a DC generating, management and distribution system, powering off a first active rectifier; in response to a current in the DC generating, management and distribution system falling below a predetermined current threshold, turning on the first active rectifier and turning off a second active rectifier; and in response to the current in the generating, management and distribution system exceeding the predetermined current threshold, turning off the first active rectifier off and turning off the second active rectifier.