Abstract: A polyphase power-supply device includes first to N-th DC-DC converters connected in parallel to each other between an input terminal and an output terminal and a switching controller configured to perform interleave control on the first to N-th DC-DC converters by supplying first to N-th pulse width modulation (PWM) signals to the first to N-th DC-DC converters, respectively, where N is any integer equal to or greater than two. A switching frequency of the first PWM signal is changed at a change time point at which a cycle of the first PWM signal starts. A length of a cycle of the k-th PWM signal firstly appearing after the change time point is shorter than lengths of subsequent cycles of the k-th PWM signal appearing the first cycle of the k-th PWM signal. This polyphase power-supply device has high reliability.

Abstract: A method for preventing ground fault in a three-phase electric transmission line system caused by a line break, includes: providing a programmable relay protection system, including a plurality of relay devices on each line, programmed to include: monitoring of acceptable preset parameter ranges of at least three pairs electric operating conditions, that include at least one high sensitivity instantaneous undercurrent and at least one high sensitivity condition selected from line differential overcurrent and negative sequence instantaneous overcurrent, zero sequence instantaneous overcurrent, and change in instantaneous undercurrent (and combinations thereof); permitting closed circuit operation when all of the lines show that the operating conditions are within the preset acceptable ranges; tripping a circuit breaker on a broken line when that line shows two operating conditions outside the preset parameter ranges; and shutting down power to the broken line before it otherwise causes a ground fault or other

Abstract: According to one embodiment, disclosed are a DC-DC converter for preventing the unnecessary consumption of a battery in a solar power-linked energy storage system, and a control method thereof. Particularly, a sensing switch is controlled according to a current mode, and thus unnecessary power consumption can be prevented. In addition, a method for operating a circuit breaker, related thereto, is disclosed.

Abstract: A power switch controller includes a condition detector, a zero crossing detector, a retimer, and a driver. The condition detector detects a change in a sense signal towards a first or second condition. The zero crossing detector detects zero crossings in an AC powerline signal. The power switch controller drives a latching relay that connects a load to powerlines. The power switch controller activates or deactivates the latching relay based on the sensed condition, and retimes activation and deactivation pulses to align the relay contact opening and closing times to coincide with the AC powerline zero crossings, compensating for contact travel times. The activation and deactivation pulses have a duration of max 20 ms, and an amplitude of at least 110% of the maximum sustainable voltage for the relay coil(s). A power-on reset deactivates the relay, aligned with a second AC zero crossing.

Abstract: A voltage source converter has a half bridge (18) with two current valves (19, 20) connected in series and an arrangement configured to carry out voltage measurements for determining a value of the DC voltage between opposite poles (21, 22) of a DC side of the converter. Each current valve comprises a semiconductor device (23, 24) controlled by an associated gate drive member (29, 30), each forming gate drive parts of one gate drive unit (28) in common to both current valves. The gate drive unit (28) comprises an isolated two-way communication link (33) between the gate drive members. The arrangement is included in the gate drive unit and configured to measure the entire DC voltage between said opposite poles (21, 22). A converter control device (31) calculates and sends control signals to the gate drive unit based on the result of the voltage measurement.

Abstract: Embodiments provide an electrostatic discharge (ESD) protection circuit and an electrostatic discharge method. The ESD protection circuit includes: a pulse detection unit (100), a discharge transistor (300), a feedback delay unit (200), and a processing unit (400). A first terminal of the pulse detection unit (100) is connected to a first pad (101), a second terminal of the pulse detection unit (100) is connected to a second pad (102), and an output terminal of the pulse detection unit (100) is configured to output a detection result signal. A gate of the discharge transistor (300) is connected to the output terminal of the pulse detection unit (100), a drain of the discharge transistor (300) is connected to the first pad (101), and a source of the discharge transistor (300) is connected to the second pad (102). The feedback delay unit (200) includes a PMOS transistor (Mp) and an NMOS transistor (Mn).

Abstract: A method for controlling the input voltage frequency of a DC-DC converter includes defining a setpoint voltage value, computing a control frequency value of the DC-DC converter as a function of the battery voltage, a power setpoint, and the setpoint input voltage, and applying the control frequency to the converter.

Abstract: A power supply unit for an aerosol generation device is provided. The power supply unit includes an internal power supply configured to hold power supplied to a heater configured to heat an aerosol source, a connector connectable to an external power supply, a controller configured to control power supply from the internal power supply to the heater, and a first transistor positioned on a first power supply path between the connector and a positive electrode of the internal power supply. A current from the connector is supplied to a source of the first transistor. A current from a drain of the first transistor is supplied to the positive electrode of the internal power supply. The controller controls a voltage of a gate of the first transistor to adjust power supplied from the external power supply to the internal power supply.

Abstract: Bladed devices that can be used for training, warning, or defense. Conductive elements are separated from the conductive blade, which can have sharp or dull edges, by an insulating material. When triggered the device can produce that can produce arcing or sparking between the conductive elements and the blade giving the device an intimidating appearance. When an opponent is near or contacts the blade, the device can shock or stun the opponent. The spark that they can be discharged when activated by the user and/or another event, such as contact with a person. The device can have any configuration, such as a knife, folding knife, dagger, sword, axe, arrow, spear, hatchet, and machete. A sheath can be used to protect sharp edges of the blade while still producing the desired electrical effects.

Abstract: A communication device for an electrical switching unit that includes an actuator driven by a control circuit. The communication device includes: a connector that can be connected to the control circuit, to receive a state signal sent by the control circuit and to receive an electrical power supply voltage supplied by the switching unit; a capacitor configured to be recharged from the power supply voltage received from the input connector when the state signal takes a predefined value; a bistable relay comprising a normally-open electrical contact connected to output terminals to form a dry electrical contact; and a pulse generator supplied by the capacitor and being configured to excite the bistable relay when the capacitor reaches a predefined level of charge.

Abstract: Devices, systems, and methods for self-testing event devices of a building alarm system are described herein. One self-test alarm system device having a self-testing capability includes a first independent power source connected to a detector module and a second independent power source connected to a self-test module.

Abstract: An impedance control transformer assembly includes and/or may be coupled with a main transformer having a nominal impedance, the assembly configured to be coupled to an electrical source and a distribution load. The assembly includes actuatable bypass contactors that couple the main transformer in a series circuit to a high-Z transformer configured to establish a combined impedance that exceeds the nominal impedance. Also included is a current sensor coupled to an output of the main transformer and which detects power demand of the distribution load. At least one processor is coupled to the current sensor and the bypass contactors, and are configured to actuate the bypass contactors responsive to detection of a predetermined power demand.

Abstract: Examples of the disclosure include a UPS comprising an output to be coupled to a load, a first converter leg to provide a first voltage to the output and including at least one of a first relay or fuse, a second converter leg in parallel with the first converter leg including at least one of a second relay or fuse and configured to provide a second voltage to the output out of phase with the first converter leg providing the first voltage signal, current sensors coupled to the first and second converter legs, respectively, and configured to provide a first signal indicative of a current in the first converter leg and a second signal indicative of a current in the second converter leg, respectively, and at least one controller to receive the signals, determine a current difference between the converter legs based on the signals, and decrease the current difference.

Abstract: Embodiments for linking separate eFuse and ORING controllers for output overvoltage protection in power conversion applications. Voltage regulators are configured in parallel. An input circuit includes an input controller, the input circuit being coupled to an input of at least one voltage regulator of the voltage regulators. An output circuit includes an output controller, the output circuit being coupled to an output of the at least one voltage regulator. The output controller is coupled to the input circuit to cause the input circuit to prevent power to the at least one voltage regulator in response to the output controller detecting an overvoltage condition.

Abstract: An electronic device has a primary loop circuit that includes a main circuit causing a current to flow in a loop shape; and a secondary loop circuit that is disposed to face the primary loop circuit at a predetermined distance, and causes an induced current generated by a magnetic field generated in the primary loop circuit to flow in a loop shape.

Abstract: A reference generator system can include a PTAT circuit coupled to a signal supply node and configured to provide a voltage reference signal or a current reference signal that is based on a physical characteristic of one or more components of the PTAT circuit and a correction signal. The system can include a CTAT circuit coupled to the PTAT circuit and configured to provide the correction signal to the PTAT circuit. In an example, the reference generator system can be implemented at least in part using NMOS devices that comprise a portion of an indium gallium zinc oxide (IGZO) substrate.

Abstract: A power supply includes: a converter circuit including boost circuits, the converter circuit boosting a voltage output from a power source; a current detector that detects a first current flowing between the power source and the converter circuit; current detectors that each detect a second current, the second current being a sum current of currents flowing in switching elements of the boost circuits; and overcurrent determiners that determine whether the second currents are overcurrent on the basis of detection values of the second currents. When a result of the determination made by corresponding one of the overcurrent determiners indicates overcurrent, the boost circuits stop operating.

Abstract: Disclosed herein is a regulator for a non-volatile memory. The regulator comprises a high voltage supply terminal, a low voltage supply terminal, an output terminal, a ground terminal and an internal node. The regulator further comprises an input amplifier inserted between the low voltage supply terminal and the ground terminal and outputting a first output voltage at a first intermediate output node according to a reference voltage and a feedback voltage provided at its negative and positive input terminals, respectively; a mirror circuit forming two current paths between the internal node and the ground terminal and between the internal node and a second intermediate output node respectively; and a cascode block coupled between the high voltage supply terminal and the internal node and operating in response to a voltage at the second intermediate output node of the regulator where the two current path is formed by the mirror circuit.

Abstract: A hand-wearable device capable of electro muscular incapacitation device is disclosed. The device may comprise a glove portion including a back side and a palm side, a stun hardware component including a charging port, a rechargeable battery, and a capacitor. First and second terminals may be positioned on the same or different finger(s) of the glove portion, and electrically connected to the stun hardware component. The glove portion may encompass a traditional five-fingered glove, cycling glove, lifting glove, gauntlet, cuff, or bracer. When the hand-wearable device comprises a glove, the glove portion may be an insulated glove. A switch for actuating discharge of an electrical charge from the first and/or second terminal may be activated when contact is made with the switch; an accelerometer may be adapted to prevent the discharge when acceleration of the glove portion has not reached a predetermined rate.

Abstract: A power conversion apparatus includes a filter capacitor, a contactor to electrically connect the filter capacitor to a power source or electrically disconnect the filter capacitor from the power source, and a failure determiner to determine whether a failure occurs in the contactor. When the contactor is kept closed during a determination period since closing of the contactor and a reduction in the voltage in the filter capacitor during the determination period is greater than or equal to a reference value, the failure determiner determines occurrence of a failure in the contactor.