# US 12,015,266 B2 · DC distribution panel > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,015,266 B2 - Document ID: US12015266B2 - Status: Granted - Kind: B2 - Application number: 17/600,868 - Filed: 2019-07-11 - Published: 2022-06-16 - Granted: 2024-06-18 - Earliest claimed: 2019-07-11 - Assignees: Mitsubishi Electric Corporation - Applicants: Mitsubishi Electric Corporation - Inventors: Kenichi Fukuno; Takushi Jimichi - Web page: https://patentgrep.com/patent/US12015266B2 ## CPC - H02H 3/18: responsive to reversal of direct current - H02H 7/22: for distribution gear, e.g. bus-bar systems; for switching devices {(detecting mechanical or electrical defects in gas-insulated switchgears H02B13/065)} - H01H 33/59: Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the AC cycle - H02H 1/0007: {concerning the detecting means (in general G01R or other subclasses of G01; reed switches H01H71/2445)} - H02H 3/087: for DC applications - H02H 9/001: {limiting speed of change of electric quantities, e.g. soft switching on or off (progressive control of electronic switches for eliminating interferences H03K17/16)} - 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) - H01H: ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES (contact cables H01B7/10; electrolytic self-interrupters H01G9/18; emergency protective circuit arrangements H02H; switching by electronic means without contact-making H03K17/00) ## Abstract An object is to provide a DC distribution panel that, even when short-circuit current has occurred in one feeder, interrupts only the feeder where short-circuit current has occurred, and thus can continue operations of load apparatuses connected to normal feeders. This DC distribution panel includes: an input terminal including positive and negative input terminals; circuit breakers having short-circuit current interruption units connected to at least either of positive electric paths and negative electric paths respectively branched from the positive and negative input terminals; and output terminals including positive output terminals and negative output terminals of the plurality of circuit breakers. At least one of the plurality of circuit breakers includes a reverse current interruption unit for interrupting reverse current flowing through the positive electric path from the output terminal side to the input terminal side. ## Claims ### Claim 1 A DC distribution panel comprising: an input terminal including a positive input terminal and a negative input terminal; a plurality of circuit breakers having short-circuit current interruption circuits provided to at least either of positive electric paths and negative electric paths respectively branched from the positive input terminal and the negative input terminal; and output terminals including positive output terminals and negative output terminals of the plurality of circuit breakers, wherein at least one of the plurality of circuit breakers includes a reverse current interruption circuit for interrupting reverse current flowing through the positive electric path from the output terminal side to the input terminal side, wherein the reverse current interruption circuit has a semiconductor switching element, a first diode connected in antiparallel to the semiconductor switching element, a second diode connected in series to the semiconductor switching element, and a capacitor connected in parallel with the series connection of the semiconductor switching element and the second diode. ### Claim 2 (depends on 1) The DC distribution panel according to claim 1, wherein the circuit breaker has an inrush current prevention circuit on at least either of the positive electric path and the negative electric path. ### Claim 3 (depends on 1) The DC distribution panel according to claim 1, wherein the circuit breaker has an inductance element on at least either of the positive electric path and the negative electric path. ### Claim 4 (depends on 1) The DC distribution panel according to claim 1, wherein the circuit breaker has a current sensor for detecting a value of current flowing through the positive electric path or the negative electric path inside the circuit breaker, a determination circuit for determining whether the reverse current has occurred by comparing the current value detected by the current sensor with a predetermined current threshold, and a gate drive circuit for turning off the semiconductor switching element when the determination circuit determines that the reverse current has occurred. ### Claim 5 (depends on 1) The DC distribution panel according to claim 1, wherein the circuit breaker has an inrush current prevention circuit on at least either of the positive electric path and the negative electric path, and the inrush current prevention circuit is composed of a resistor and a bypass switch connected in parallel to the resistor. ### Claim 6 (depends on 1) The DC distribution panel according to claim 1, wherein the circuit breaker has an inductance element on at least either of the positive electric path and the negative electric path, and an inductance value of the inductance element is set to such a value as to satisfy a condition that a value of current flowing through the semiconductor switching element is smaller than a maximum current value in a reverse bias safe operating area of the semiconductor switching element. ### Claim 7 (depends on 2) The DC distribution panel according to claim 2, wherein the circuit breaker has an inductance element on at least either of the positive electric path and the negative electric path. ### Claim 8 (depends on 4) The DC distribution panel according to claim 4, wherein the circuit breaker has a control power supply for supplying power to the current sensor, the determination circuit, and the gate drive circuit, and drive power of the control power supply is supplied from the positive electric path and the negative electric path on the output terminal side. ### Claim 9 (depends on 4) The DC distribution panel according to claim 4, wherein the circuit breaker has an inrush current prevention circuit on at least either of the positive electric path and the negative electric path, and the inrush current prevention circuit is composed of a resistor and a bypass switch connected in parallel to the resistor. ### Claim 10 (depends on 4) The DC distribution panel according to claim 4, wherein the circuit breaker has an inductance element on at least either of the positive electric path and the negative electric path, and an inductance value of the inductance element is set to such a value as to satisfy a condition that a value of current flowing through the semiconductor switching element is smaller than a maximum current value in a reverse bias safe operating area of the semiconductor switching element. ### Claim 11 (depends on 5) The DC distribution panel according to claim 5, wherein a resistance value of the resistor is set to such a value as to satisfy a condition that a value of current flowing through the first diode is smaller than a rated current value of the first diode. ### Claim 12 (depends on 8) The DC distribution panel according to claim 8, wherein the circuit breaker has an inrush current prevention circuit on at least either of the positive electric path and the negative electric path, and the inrush current prevention circuit is composed of a resistor and a bypass switch connected in parallel to the resistor. ### Claim 13 (depends on 8) The DC distribution panel according to claim 8, wherein the circuit breaker has an inductance element on at least either of the positive electric path and the negative electric path, and an inductance value of the inductance element is set to such a value as to satisfy a condition that a value of current flowing through the semiconductor switching element is smaller than a maximum current value in a reverse bias safe operating area of the semiconductor switching element. ### Claim 14 (depends on 9) The DC distribution panel according to claim 9, wherein a resistance value of the resistor is set to such a value as to satisfy a condition that a value of current flowing through the first diode is smaller than a rated current value of the first diode. ### Claim 15 (depends on 10) The DC distribution panel according to claim 10, wherein a resistance value of the resistor is set to such a value as to satisfy a condition that a value of current flowing through the first diode is smaller than a rated current value of the first diode.