An apparatus is described. The apparatus includes a stacked switch circuit having protection circuitry to prevent shoot through current when the switch is in an off state and respective voltages at the terminals of the switch change such that before the change one of the terminals of the switch has the higher voltage and after the change the other terminal of the switch has the higher voltage.

A safety device capable of being connected between a circuit breaker device and an electric installation powered by an electric grid providing three-phase current having a first associated frequency, using a line for conveying electric current including three phase conductors, a neutral conductor and a protection conductor. The safety device makes it possible to verify at least one electric safety condition following a cut off of electric power of the electric installation by the circuit breaker device. The safety device comprises circuitry or a processor configured to verify presence of a residual voltage above a predetermined safety threshold on at least one of the conductors, and verify isolation between a tested pair of conductors, among the phase conductors. The safety device can be used to perform an associated safety verification method.

A motor drive device includes a power source unit rectifying AC voltage to DC voltage and to smooth the DC voltage by a capacitor, a motor drive amplification, a power source voltage measurement unit, an insulation resistance deterioration detection unit having a contact unit connecting one end of the capacitor to the ground and a current detection unit provided between the other end of the capacitor and a motor coil, and detecting a deterioration in an insulation resistance of the motor based on a detected signal obtained from a closed circuit formed by the contact unit, the capacitor, the motor coil, and the ground by using the current detection unit, and a failure detection unit detecting a failure in the insulation resistance deterioration detection unit based on the detected signal in the insulation resistance deterioration detection unit and a voltage value measured by the power source voltage measurement unit.

A switching power supply device includes: a latch circuit to be set by a latch signal that is generated when an anomaly is detected, the latch circuit stopping the turning ON and OFF of the switching element when set by the latch signal; a pulse generator that receives said latch signal and generates a pulse signal at a prescribed cycle in response to said latch signal; a discharge circuit that is activated every time said pulse signal is provided so as to discharge electric charges stored in the capacitor; and a comparator for undervoltage protection that, when said control power supply voltage decreases to a prescribed operation stop voltage as said capacitor discharges, resets the latch circuit and the pulse generator, respectively.

A protection device for protecting an electronic device includes a current sensing module, for detecting a current flowing through a power supply path of the electronic device to generate a current signal; a processing device, coupled to the current sensing module, for receiving the current signal to determine whether the current corresponding to the current signal is greater than a first threshold value and outputting a control signal accordingly; a first switch, disposed on the power supply path, for controlling the power supply path to be switched on or off according to an input voltage of the power supply path; and a first control module, coupled to the processing device and the first switch, for controlling the first switch to be turned on or off according to the control signal outputted by the processing device, in order to control the power supply path to be switched on or off.

A photovoltaic string combiner box with protection functions includes: a plurality of input connections for connecting a plurality of photovoltaic strings to the combiner box, the plurality of input connections respectively including a first input terminal and a second input terminal; an output connection for connecting an inverter to the combiner box; a plurality of current lines, a respective one of the current lines being connected to a respective one of the input connections; a plurality of controllable switches being connected to the plurality of input connections for short-circuiting a respective one of the first and second input terminals; a plurality of disconnectors; a common current line connected to the output connection and having an input node connected to each of the plurality of current lines by a respective one of the disconnectors; and a controllable network arranged in the common current line between the output connection and input node.

A photovoltaic string combiner box with protection functions includes: a plurality of input connections for connecting a plurality of photovoltaic strings to the combiner box, the plurality of input connections respectively including a first input terminal and a second input terminal; an output connection for connecting an inverter to the combiner box; a plurality of current lines, a respective one of the current lines being connected to a respective one of the input connections; a plurality of controllable switches being connected to the plurality of input connections for short-circuiting a respective one of the first and second input terminals; a plurality of disconnectors; a common current line connected to the output connection and having an input node connected to each of the plurality of current lines by a respective one of the disconnectors; and a controllable network arranged in the common current line between the output connection and input node.

A protective wiring device disposed in an electrical distribution system, the device comprising: a plurality of line terminals comprising a line-side phase terminal and a line-side neutral terminal; a plurality of load terminals comprising a load-side phase terminal and a load-side neutral terminal; a line conductor electrically coupling the line-side phase terminal to the load-side phase terminal; a neutral conductor electrically coupling the line-side neutral terminal to the load-side neutral terminal; a controller configured to transmit wirelessly data derived from signals present on at least one of the line conductor or the neutral conductor and to receive wirelessly receive at least one command.

An electronic device is configured with sub-assemblies including a main logic board, flexible printed circuit, and dual battery packs that are assembled together with electrical connectors to enable power from the battery packs to flow over a power bus that is distributed along the flexible printed circuit and main logic board. A protection circuit module (PCM) in each battery pack is configured to determine a state of each of the connections among the sub-assemblies (i.e., whether or not properly assembled to provide electrical continuity through the connector) so that power from the battery packs is switched on to the power bus only when electrical continuity is verified at each of the connectors. In the event that any connection is faulty, for example due to a misalignment of a connector during assembly that prevents electrical continuity to be established through a connector, neither PCM will switch power on to the power bus.

In order to protect reverse currents, several strings of a photovoltaic generator, which are connected in small groups respectively via a DC/DC-converter, parallel to a common DC voltage intermediate circuit, the current which flows over each of the DC/DC-converter is detected and if a reverse current is detected flowing through one of the DC/DC converters, the converter is stopped by controlling the DC/DC-converter.