The present invention discloses a DC solid-state circuit breaker with self-adapt fault current limiting capability. The topology of the DC solid-state circuit breaker is a H-bridge circuit consisting of two unidirectional breakable bridge arms and two series-connected diode bridge arms, wherein the two unidirectional breakable bridge arms are connected in series to the two series-connected diode bridge arms in a same direction to form two series branches, respectively; the series branches are connected in parallel; a series branch formed by a DC reactor L and a DC biased power supply is connected to the PCC between the two unidirectional breakable bridge arms and the PCC between the two series-connected diode bridge arms; the DC line is connected to the two PCCs, respectively.

The present invention discloses a DC solid-state circuit breaker with self-adapt fault current limiting capability. The topology of the DC solid-state circuit breaker is a H-bridge circuit consisting of two unidirectional breakable bridge arms and two series-connected diode bridge arms, wherein the two unidirectional breakable bridge arms are connected in series to the two series-connected diode bridge arms in a same direction to form two series branches, respectively; the series branches are connected in parallel; a series branch formed by a DC reactor L and a DC biased power supply is connected to the PCC between the two unidirectional breakable bridge arms and the PCC between the two series-connected diode bridge arms; the DC line is connected to the two PCCs, respectively.

The present invention relates to a power supply circuit (400) for a breaking circuit (100), the power supply circuit (400) comprising a first connecting point (CP1) arranged to be connected to an input (102) of the breaking circuit (100) and a second connecting point (CP2) arranged to be connected to an output (104) of the breaking circuit (100). The power supply circuit (400) further comprises a first rectifier (416) and a second rectifier (418) connected in series and in opposite direction to each other between the first connecting point (CP1) and the second connecting point (CP2); a first switch (412) and a second switch (414) connected in series between the first connecting point (CP1) and the second connecting point (CP2), wherein the first switch (412) and the second switch (414) are connected in parallel to the first rectifier (416) and the second rectifier (418); and a first capacitor (C1) having a first connecting point (CP1.sub.C1) connected between the first rectifier (416) and the second rectifier (418) and a second connecting point (CP2.sub.C1) connected between the first switch (412) and the second switch (414), wherein the first connecting point (CP1.sub.C1) of the first capacitor (C1) is further arranged to be connected to a power consumer (110a, 110b, . . . , 110n) of the breaking circuit (100). The power supply circuit (400) is arranged to at least one of: open the first switch (412) so that a current running from the input (102) to the output (104) passes via the first rectifier (416), the first capacitor (C1) and the second switch (414) thereby charging the first capacitor (C1); and open the second switch (414) so that a current running from the output (104) to the input (102) passes via the second rectifier (418), the first capacitor (C1) and the first switch (412) thereby charging the first capacitor (C1).

The present invention relates to a power supply circuit (400) for a breaking circuit (100), the power supply circuit (400) comprising a first connecting point (CP1) arranged to be connected to an input (102) of the breaking circuit (100) and a second connecting point (CP2) arranged to be connected to an output (104) of the breaking circuit (100). The power supply circuit (400) further comprises a first rectifier (416) and a second rectifier (418) connected in series and in opposite direction to each other between the first connecting point (CP1) and the second connecting point (CP2); a first switch (412) and a second switch (414) connected in series between the first connecting point (CP1) and the second connecting point (CP2), wherein the first switch (412) and the second switch (414) are connected in parallel to the first rectifier (416) and the second rectifier (418); and a first capacitor (C1) having a first connecting point (CP1.sub.C1) connected between the first rectifier (416) and the second rectifier (418) and a second connecting point (CP2.sub.C1) connected between the first switch (412) and the second switch (414), wherein the first connecting point (CP1.sub.C1) of the first capacitor (C1) is further arranged to be connected to a power consumer (110a, 110b, . . . , 110n) of the breaking circuit (100). The power supply circuit (400) is arranged to at least one of: open the first switch (412) so that a current running from the input (102) to the output (104) passes via the first rectifier (416), the first capacitor (C1) and the second switch (414) thereby charging the first capacitor (C1); and open the second switch (414) so that a current running from the output (104) to the input (102) passes via the second rectifier (418), the first capacitor (C1) and the first switch (412) thereby charging the first capacitor (C1).

A direct current (DC) overvoltage monitoring and protection device includes an overvoltage sensor operably connected to an electrical power input line. The overvoltage sensor is configured to change state upon detection of a voltage over a preselected threshold. An overvoltage relay is operably connected to the overvoltage sensor. The overvoltage relay includes one or more relay switches configured to move between a first position and a second position when the voltage over the preselected threshold is detected. An independent relay power source is operably connected to the overvoltage relay to provide electrical power to the overvoltage relay, separate from the electrical power being monitored via the electrical power input line.

The present invention discloses a DC solid-state circuit breaker with self-adapt fault current limiting capability. The topology of the DC solid-state circuit breaker is a H-bridge circuit consisting of two unidirectional breakable bridge arms and two series-connected diode bridge arms, wherein the two unidirectional breakable bridge arms are connected in series to the two series-connected diode bridge arms in a same direction to form two series branches, respectively; the series branches are connected in parallel; a series branch formed by a DC reactor L and a DC biased power supply is connected to the PCC between the two unidirectional breakable bridge arms and the PCC between the two series-connected diode bridge arms; the DC line is connected to the two PCCs, respectively.

The present invention discloses a DC solid-state circuit breaker with self-adapt fault current limiting capability. The topology of the DC solid-state circuit breaker is a H-bridge circuit consisting of two unidirectional breakable bridge arms and two series-connected diode bridge arms, wherein the two unidirectional breakable bridge arms are connected in series to the two series-connected diode bridge arms in a same direction to form two series branches, respectively; the series branches are connected in parallel; a series branch formed by a DC reactor L and a DC biased power supply is connected to the PCC between the two unidirectional breakable bridge arms and the PCC between the two series-connected diode bridge arms; the DC line is connected to the two PCCs, respectively.

An electronic system for a surgical instrument is disclosed. The electronic system comprises a main power supply circuit configured to supply electrical power to a primary circuit. A supplementary power supply circuit configured to supply electrical power to a secondary circuit. A short circuit protection circuit coupled between the main power supply circuit and the supplementary power supply circuit. The supplementary power supply circuit is configured to isolate itself from the main power supply circuit when the supplementary power supply circuit detects a short circuit condition at the secondary circuit. The supplementary power supply circuit is configured to rejoin the main power supply circuit and supply power to the secondary circuit, when the short circuit condition is remedied.

An electronic system for a surgical instrument is disclosed. The electronic system comprises a main power supply circuit configured to supply electrical power to a primary circuit. A supplementary power supply circuit configured to supply electrical power to a secondary circuit. A short circuit protection circuit coupled between the main power supply circuit and the supplementary power supply circuit. The supplementary power supply circuit is configured to isolate itself from the main power supply circuit when the supplementary power supply circuit detects a short circuit condition at the secondary circuit. The supplementary power supply circuit is configured to rejoin the main power supply circuit and supply power to the secondary circuit, when the short circuit condition is remedied.

A circuit breaker system is disclosed in the present application. The circuit breaker system includes a housing to hold an electrical interrupter within an internal region separated from an external ambient region. The electrical interrupter includes at least a first pair of electrical contact elements that are movable between open and closed positions. A voltage limiter, such as a metal oxide varistor (MOV), is connected across the pair of electrical contact elements to receive and dissipate a transient voltage when the first pair of electrical contacts is moved from a closed position to an open position, thereby reducing undesired arcing and premature wear or erosion of certain electrical components.