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).

An electronic current-switching system comprising a driver unit and a current-switching device with one controlled transistor, a control unit coupled to said transistor, a power supply unit of the control unit and a digital communication bus transmitting to the control unit a first control signal of the driver unit. The power supply unit comprises: a transformer, an integrated circuit including a clock input coupled to a second output of the driver unit delivering a second control signal having the form of a pulsed signal with an adjustable duty cycle, and an output delivering to the transformer a primary voltage signal dependent on the second control signal, and a voltage divider bridge measuring the frequency-domain signal delivered by the transformer.

The present disclosure provides a DC mechanical circuit breaker that can utilize two switches, one of which can generate zero-crossing with an alternate oscillatory circuit for the other one, which can be a conventional zero-crossing-based AC breaker and can be used in the main circuit. This is different from the conventional single-switch commute-and-absorb method currently used. The present disclosure shows that disclosed circuit breaker improves the fault current extinction and significantly reduces the voltage rate-of-change while creating the current zero-crossing faster compared to the available technology. Thus, disclosed circuit breaker is capable of interrupting high DC currents with minimal arc through a less expensive AC circuit breaker. Simulation and hardware results are provided to show the efficiency of the disclosed circuit breaker.

An intelligent switch device and a power generation system are provided. The intelligent switch device includes a first power port, a second power port, a switch unit and a control unit. A first end of a switch unit is connected to a first power supply via a first power port, and a second end of the switch unit is connected to a second power supply via a second power port. The control unit is configured to control the switch unit to be turned on for a first time period when the first power supply is in abnormal condition, where the abnormal condition causes the switch unit to be tripped. The first time period is greater than or equal to a time period required for a device to respond to the abnormal condition.

The invention relates to a novel approach for the protection of electrical circuits from ground faults and parallel and series arc faults in a fully solid-state circuit configuration. Solid-state circuits and methods of use are described that provide the key functions of low-voltage DC power supply, mains voltage and current sensing, fault detection processing and high voltage electronic switching.

The invention relates to a novel approach for the protection of electrical circuits from ground faults and parallel and series arc faults in a fully solid-state circuit configuration. Solid-state circuits and methods of use are described that provide the key functions of low-voltage DC power supply, mains voltage and current sensing, fault detection processing and high voltage electronic switching.

An image forming device that forms an image on a medium, includes: a heater that heats the medium; a control unit that controls the heater; a first path that receives input voltage from an external power supply, converts the input voltage into desired voltage, and supplies the desired voltage to the control unit; a second path that divides the input voltage received by the first path and supplies the input voltage to the heater; a control element that is connected to the second path and controls ON/OFF switching of the heater according to control from the control unit; and a disconnection unit that disconnects the second path depending on condition of the input voltage.

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.