# US 7,411,768 B2 · Low-loss rectifier with shoot-through current protection > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,411,768 B2 - Document ID: US7411768B2 - Status: Granted - Kind: B2 - Application number: 11/442,843 - Filed: 2006-05-30 - Published: 2007-12-06 - Granted: 2008-08-12 - Earliest claimed: 2006-05-30 - Assignees: Harris Corporation - Inventors: Troy Woodrow Sells - Web page: https://patentgrep.com/patent/US7411768B2 ## CPC - H02H 7/1255: {responsive to internal faults, e.g. by monitoring ripple in output voltage} - H02H: EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS (indicating or signalling undesired working conditions G01R, e.g. G01R31/00, G08B; locating faults along lines G01R31/08; emergency protective devices H01H) ## Abstract A transistor active bridge circuit (400) rectifies domestic AC mains (for example, 120V, 60 Hz) and/or foreign AC mains (for example, 230V, 50 Hz) with low power loss. The circuit includes first and second field effect transistors (102, 104) of a first channel type, and third and fourth field effect transistors (106, 108) of a second channel type that is different from the first channel type. A set of voltage dividers (110, 112, 114, 116, 118, 120, 122, 124) and voltage clamping devices (126, 128, 130, 132) permit the circuit (400) to efficiently operate over a wider range of input voltages, without potential damage to the field effect transistors. Shoot-through protection devices (420, 430) provide a means for preventing the first and second field effect transistors (102, 104) from conducting simultaneously. Shoot-through protection devices (440, 450) provide a means for preventing the third and fourth field effect transistors (106, 108) from conducting simultaneously. ## Claims ### Claim 1 A transistor active bridge circuit connectable between a pair of input lines and a pair of output lines, comprising: first and second field effect transistors of a first channel type, a source-drain path of said first field effect transistor connected in series with a source-drain path of said second field effect transistor to form a first series transistor combination connected across said input lines; third and fourth field effect transistors of a second channel type, a source-drain path of said third field effect transistor connected in series with a source-drain path of said fourth field effect transistor to form a second series transistor combination connected across said input lines; a voltage divider provided for each of said field effect transistors, said voltage divider comprised of a first resistor and a second resistor connected in series from a source of each said field effect transistor to one of said input lines; a bias voltage tap defined at a connection point between said first and second resistors connected to a gate of each of said field effect transistors; and a shoot-through protection circuit comprising at least one active device connected across a gate and a source of each of said first, second, third, and fourth field effect transistors. ### Claim 2 (depends on 1) The transistor active bridge circuit of claim 1, further comprising a voltage clamping device connected between said gate and said source of each respective one of said field effect transistors. ### Claim 3 (depends on 1) The transistor active bridge circuit of claim 1, further comprising a first output line connected to said first series combination at an interconnection point between said first and said second field effect transistors, and a second output line connected so said second series combination at an interconnection point between said third and fourth field effect transistors. ### Claim 4 (depends on 1) The transistor active bridge circuit of claim 1, wherein a drain of each one of said field effect transistors is connected to a first one of said input lines, said source of each one of said field effect transistor is connected to said first resistor, and said second resistor is connected to a second one of said input lines. ### Claim 5 (depends on 1) The transistor active bridge circuit according to claim 1, wherein said first channel type is different from said second channel type. ### Claim 6 (depends on 1) The transistor active bridge circuit according to claim 1, wherein each of said field effect transistors is a MOSFET type device. ### Claim 7 (depends on 1) The transistor active bridge circuit according to claim 1, wherein said at least one active device is a depletion mode field effect transistor. ### Claim 8 (depends on 7) The transistor active bridge circuit according to claim 7, wherein said shoot-through protection circuit further comprises a voltage divider provided for said depletion mode field effect transistor, said voltage divider comprised of a third resistor and a fourth resistor connected to a gate of said depletion mode field effect transistor. ### Claim 9 (depends on 8) The transistor active bridge circuit according to claim 8, wherein said third and fourth resistors are connected in series between said input lines. ### Claim 10 (depends on 9) The transistor active bridge circuit according to claim 9, wherein said shoot-through protection circuit further comprises a zener diode connected between said gate and a source of said depletion mode field effect transistor. ### Claim 11 (depends on 1) The transistor active bridge circuit according to claim 1, wherein said at least one active device comprises fifth and sixth field effect transistors of said second channel type, a source-drain path of said fifth field effect transistor connected between a gate and source of said first field effect transistor, a source-drain path of said sixth field effect transistor connected between a gate and source of said second field effect transistor. ### Claim 12 (depends on 1) The transistor active bridge circuit according to claim 1, wherein said at least one active device comprises seventh and eighth field effect transistors of said first channel type, a source-drain path of said seventh field effect transistor connected between a gate and source of said third field effect transistor, a source-drain path of said eighth field effect transistor connected between a gate and source of said fourth field effect transistor. ### Claim 13 A transistor active bridge circuit connectable between a pair of input lines and a pair of output lines, comprising: first and second field effect transistors of a first channel type, a source-drain path of said first field effect transistor connected in series with a source-drain path of said second field effect transistor to form a first series transistor combination connected across said input lines; third and fourth field effect transistors of a second channel type different from said first channel type, a source-drain path of said third field effect transistor connected in series with a source-drain path of said fourth field effect transistor to form a second series transistor combination connected across said input lines; a voltage divider provided for each of said field effect transistors, said voltage divider connected in series from a source of each said field effect transistor to one of said input lines; an output tap of each said voltage divider configured for providing an output voltage that is reduced relative to an input voltage applied to each said voltage divider, each said output tap respectively connected to a gate of each of said field effect transistors; and a shoot-through protection circuit means for preventing said first and second field effect transistors from simultaneously conducting and for preventing said third and fourth field effect transistors from simultaneously conducting. ### Claim 14 A transistor active bridge circuit connectable between a pair of input lines and a pair of output lines, comprising: a field effect transistor bridge rectifier circuit comprised of a plurality of field effect transistors; a voltage divider provided for each of said plurality of field effect transistors, said voltage divider comprised of a first resistor and a second resistor connected in series from a source of each said field effect transistor to one of said input lines; a bias voltage tap defined at a connection point between said first and second resistors connected to a gate of each of said field effect transistors; and a shoot-through protection circuit for each of said plurality of field effect transistors, said shoot-through protection circuit comprising at least one active device connected across a gate and a source of each of said plurality of field effect transistors. ### Claim 15 (depends on 14) The transistor active bridge circuit of claim 14, further comprising a zener diode connected between said gate and said source of each respective one of said field effect transistors. ### Claim 16 (depends on 14) The transistor active bridge circuit of claim 14, wherein said bridge rectifier circuit is comprised of first and second field effect transistors of a first channel type, and third and fourth field effect transistors of a second channel type; and wherein a source-drain path of said first field effect transistor is connected in series with a source-drain path of said second field effect transistor to form a first series transistor combination connected across said input lines, and a source-drain path of said third field effect transistor connected in series with a source-drain path of said fourth field effect transistor form a second series transistor combination connected across said input lines. ### Claim 17 (depends on 16) The transistor active bridge circuit of claim 16, wherein said at least one active device comprises a fifth and a sixth field effect transistors of said second channel type, and a seventh and eighth field effect transistors of said first channel type; and wherein a source-drain path of said fifth field effect transistor is connected between a gate and source of said first field effect transistor, a source-drain path of said sixth field effect transistor is connected between a gate and source of said second field effect transistor, a source-drain path of said seventh field effect transistor is connected between a gate and source of said third field effect transistor, and a source-drain path of said eighth field effect transistor is connected between a gate and source of said fourth field effect transistor. ### Claim 18 (depends on 14) The transistor active bridge circuit of claim 14, wherein a drain of each one of said field effect transistors is connected to a first one of said input lines, said source of each one of said field effect transistor is connected to said first resistor, and said second resistor is connected to a second one of said input lines. ### Claim 19 (depends on 14) The transistor active bridge circuit of claim 14, wherein said at least one active device is a depletion mode field effect transistor. ### Claim 20 (depends on 19) The transistor active bridge circuit of claim 19, wherein said shoot-through protection circuit further comprises a voltage divider provided for said depletion mode field effect transistor, said voltage divider comprised of a third resistor and a fourth resistor connected to a gate of said depletion mode effect transistor. ### Claim 21 (depends on 20) The transistor active bridge circuit of claim 20, wherein said third and fourth resistors are connected in series between said input lines. ### Claim 22 (depends on 21) The transistor active bridge circuit of claim 21, wherein said shoot-through protection circuit further comprises a zener diode connected between said gate and a source of said depletion mode field effect transistor.