Abstract: The present invention includes: a first current source, through which a first current is made to flow; a second current source, through which a second current set at a certain ratio to the first current is made to flow; a first current path, which includes a second resistor, a first resistor, and a first bipolar transistor that are connected to the first current source in a sequential manner, and through which the first current is made to flow; a second current path, which includes a third resistor and a 0th bipolar transistor that are connected to the second current source in a sequential manner, and through which the second current is made to flow; an operational amplifier, which controls current amounts of the first current and the second current by an output from an output end, and of which a positive input end is connected to a connection point between the second resistor and the first resistor, and of which a negative input end is connected to a connection point between the third resistor and the 0th bi

Abstract: A method for switching off power semiconductor switches in a bridge circuit having first through sixth power semiconductor switches. The method includes a switch-off process for establishing a final switch configuration in which all power semiconductor switches in the bridge circuit are in a switched-off state. Over the course of the switch-off process, a switch configuration is established in which the fifth power semiconductor switch and the sixth power semiconductor switch are concurrently in a switched-on state, while the first power semiconductor switch and the fourth power semiconductor switch are in a switched-off state. Also disclosed is a bridge circuit having a control circuit configured to carry out such a method. In addition, an inverter that includes at least one bridge circuit of this type is also provided.

Abstract: An embodiment voltage converter includes a first transistor connected between a first node of the converter and a second node configured to receive a power supply voltage, a second transistor connected between the first node and a third node configured to receive a reference potential, a first circuit configured to control the first and second transistors, and a comparator including first and second inputs. The first input is configured to receive, during a first phase, a first voltage ramp and, during a second phase, a set point voltage. The second input is configured to receive, during the first phase, the set point voltage and, during the second phase, a second voltage ramp.

Abstract: An AC power supply for connection to at least one electrode of an electrodynamic screen includes a DC-to-DC converter electrically coupled to a source of DC voltage including an output. The system includes a DC-to-AC converter electrically coupled to the output of the DC-to-DC converter, including a two-terminal passive element electrically coupled in series with a first transistor including a control terminal electrically coupled to a periodic voltage signal configured to switch the first transistor between an on/off state. The system includes an AC output including an AC voltage configured to change periodically. The system includes a regulator circuit configured to sample the AC output voltage and detect when the AC output voltage reaches a predetermined voltage. The regulator circuit is configured to electrically couple the power supply to the source of DC voltage when the output voltage is less than the predetermined voltage.

Abstract: A control circuit and method for a fuel-saving multi-state switch is provided. The control circuit comprises a vehicle body ECU, a fuel-saving control unit, and a PWM voltage regulating unit. The fuel-saving control unit is connected to the vehicle body ECU through a CAN bus to collect CAN signals. The fuel-saving control unit determines a switch gear required by a current vehicle according to the CAN signals and outputs a PWM pulse signal having a corresponding duty cycle. The PWM voltage regulating unit is connected to the fuel-saving control unit to receive the PWM pulse signal. The PWM voltage regulating unit outputs a voltage value corresponding to the switch gear according to the PWM pulse signal. The vehicle body ECU is connected to the PWM voltage regulating unit to receive the voltage value, so as to control a speed and torque of an engine according to the voltage value.

Abstract: A DC-DC switching converter includes power switches selectively coupling an output terminal with a first voltage or with a second voltage. A driver stage is coupled with the power switches for driving the power switches. A driver control stage is coupled with the driver stage for controlling the operation of the driver stage. An output current sensing circuit is coupled with the output terminal and with the driver control stage, and is configured to sense a sign of an output current delivered by the DC-DC switching converter at the output terminal and to generate control signals for the driver control stage. The driver control stage controls the operation of the driver stage according to states of the control signals received from the output current sensing circuit, for selectively delaying the activation of the power switches depending on the sensed sign of the output current.

Abstract: A power converter module includes an active metal braze (AMB) substrate, power converter circuitry, and a housing. The AMB substrate includes an aluminum nitride base layer, a first conductive layer on a first surface of the aluminum nitride base layer, and a second conductive layer on a second surface of the aluminum nitride base layer opposite the first surface. The power converter circuitry includes a number of silicon carbide switching components coupled to one another via the first conductive layer. The housing is over the power converter circuitry and the AMB substrate. By using an AMB substrate with an aluminum nitride base layer, the thermal dissipation characteristics of the power converter module may be substantially improved while maintaining the structural integrity of the power converter module.

Abstract: Proposed is an automatically testable short circuit breaker that includes: a pseudo short circuit signal driving circuit unit connected to opposite ends of a test button in a short circuit breaker; a pseudo short circuit signal recognition circuit unit which recognizes a short circuit detection signal and outputs a diagnosis signal; and a pseudo short circuit signal shut-off circuit unit which induces the short circuit detection signal to grounding so that the short circuit detection signal does not flow into the driving unit.

Abstract: A modular multilevel converter includes a plurality of submodules, each having at least two electronic switching elements, an electric energy store, two submodule connections, a bypass switch bridging the submodule, and a communication element communicating with a communication apparatus. A method for operating the modular multilevel converter includes ascertaining that the submodules have a defective submodule so that the communication element in the defective submodule does not communicate with the communication apparatus, determining whether a present arm current resulting from an operating point of the modular multilevel converter is below a predetermined threshold value, and generating or amplifying a converter-internal circular current with the defective submodule if the arm current resulting from the operating point is below the predetermined threshold value. A modular multilevel converter is also provided.

Abstract: A power conversion system includes plural power conversion apparatuses and a server connected to each of the plural power conversion apparatuses. Each of the plural power conversion apparatuses includes a power conversion circuit interconnected with a power system, a calculating unit configured to calculate, based on an output current and an output voltage of the power conversion circuit, at least one information of reactive power and a reactive current output by the power conversion circuit, a storing unit configured to accumulate, in a storage device, time-series reactive power information which is information associating time and the at least one information calculated by the calculating unit, and a communication interface configured to transmit the time-series reactive power information stored in the storage device to the server. The server is constructed to collect the time-series reactive power information of each of the plural power conversion apparatuses via the communication interface.

Abstract: This disclosure relates to a digital comparator coupled to a pair of pull-up resistors and a pair of pull-down resistors whereby both pairs of resistors are coupled to an output terminal of a low dropout (LDO) regulator. In particular, the digital comparator comprises an edge detector module, a consecutive two-edge detector module and a consecutive three-edge detector module whereby the edge detector module is configured to receive two clock signals as inputs and after being processed by these three modules, to pull-up or pull-down the resistors at the output terminal of the LDO regulator based on the rising and falling edges of the received clock signals.

Abstract: Provided is a technology that is able to shorten the time required to switch a PWM signal when driving the voltage conversion unit, and that can determine the duty according to a current value and an internal resistance of a power unit. A voltage conversion device has a current detection unit that detects a current value of a conduction path, an internal resistance detection unit that detects an internal resistance of a first power unit, a determination unit that determines a usage duty, and a drive unit that outputs a PWM signal that depends on the usage duty determined by the determination unit as a control signal. The determination unit determines the usage duty, based on the internal resistance detected by the internal resistance detection unit and the current value detected by the current detection unit.

Abstract: In a power distribution device, a current detection circuit detects a current value of a current flowing through a wire. When a switch is on, a microcomputer determines whether or not a predetermined condition is satisfied, based on the current value detected by the current detection circuit. If it is determined by the microcomputer that the predetermined condition is satisfied, a drive circuit turns off the switch.

Abstract: An isolation transformer boost system. The system includes a power supply and an isolation transformer. The isolation transformer includes a primary winding electrically connected to the power supply, a secondary winding, a first voltage tap, and a second voltage tap. Wherein the isolation transformer is configured to, in response to a command from an electronic processor, disconnect a connection from the second voltage tap and establish a second connection from the first voltage tap, wherein the command is based on an electrical characteristic measurement of the power supply exceeding an upper limit threshold for a predetermined period of time.

Abstract: A field coil type rotating electric machine includes a field coil having first and second windings connected in series with each other, a rotor having main poles on which the first and second windings are wound, and a stator having a stator coil comprised of phase windings to which harmonic currents are respectively supplied to induce field current in the field coil. In the rotor, there are formed a series resonant circuit including the first winding and a capacitor and a parallel resonant circuit including the second winding and the capacitor. The first winding is radially located closer to the stator than the second winding is. Moreover, N1<N2 and 120°<?s<240°, where N1 and N2 are respectively the numbers of turns of the first and second windings and ?s is a phase offset between electric currents flowing respectively in the series and parallel resonant circuits.

Abstract: A system (10) for modifying atmospheric conditions is disclosed. The system (10) comprises a tower (20), at least one first rod (42) and at least one second rod (62), each of the at least one first rod (42) and the at least one second rod (62) coupled to the tower (20) to extend from the tower (20) and define an end distal (46, 66) from the tower (20), wherein the at least one second rod (62) is spaced apart from the at least one first rod (42) along a height (HT) of the tower (20). The system (10) further includes a first set of emission wires (70) extending between the end (46) of the at least one first rod (42) and the end (66) of the at least one second rod (62).

Abstract: In an embodiment a current limiting circuit includes a circuit configured to detect when an input or output current of a DC to DC converter exceeds or falls below a threshold and a controller configured to store a first value representative of a level of an output voltage of the DC to DC converter in response to the input or output current exceeding or falling below a first threshold, store a second value representative of the level of the output voltage in response to the input or output current falling below a further threshold and modify a control signal based on the first and second values, wherein the control signal is modified based on the first and second values so that the control signal brings the output voltage to an intermediate voltage level between the level of the output voltage represented by the first value and the level of the output voltage represented by the second value.

Abstract: A low-dropout voltage regulator is provided. The low-dropout voltage regulator includes a differential amplifier pair, a secondary amplification circuit that is self-stabilized, an output circuit, and a frequency compensation circuit. The secondary amplification circuit includes a first amplification transistor and a second amplification transistor. The first amplification transistor includes a first terminal, a second terminal, and a third terminal. The second amplification transistor includes a first terminal, a second terminal, and a third terminal. The second terminal of the first amplification transistor is electrically connected to the second terminal of the second amplification transistor to form an input terminal of the secondary amplification circuit to be connected to an output terminal of the differential amplifier pair.

Abstract: A laminated core includes a plurality of electrical steel sheets stacked on each other, and an adhesion part provided between electrical steel sheets adjacent to each other in a stacking direction and configured to adhere the electrical steel sheets to each other, wherein the adhesion part partially adheres the electrical steel sheets adjacent to each other in the stacking direction, and the adhesion parts adjacent to each other in the stacking direction have different arrangement regions in a plan view seen in the stacking direction.

Abstract: In this armature, between the first segment conductor and the second segment conductor that are joined to each other in the joint portion, a first clearance portion is provided between the tip end portion of the first leg portion and the second leg portion body portion in the axial direction, and a second clearance portion is provided between the tip end portion of the second leg portion and the first leg portion body portion in the axial direction.