Abstract: A power supply device includes a power conversion circuit configured to generate an output voltage from an input voltage, and a controller coupled to the power conversion circuit and configured to control the power conversion circuit to generate the output voltage for causing or enhancing coalescence of a multi-phase liquid mixture when the output voltage is applied to the multi-phase liquid mixture. The controller is configured to control generation of the output voltage in accordance with a synchronization signal. The controller is further configured to generate the synchronization signal and transmit the synchronization signal to another power supply device, or receive the synchronization signal from another power supply device.

Abstract: Systems and methods for an alternating current (AC) input selection for a power transformer are disclosed. In particular, a connector is provided that is pre-wired to utilize internal wiring in the power transformer to provide a desired connection. A first option allows two transformers' input winding to be in series while a second option allows the two transformers' input winding to be in parallel. By moving the wiring into the connector, installation is simplified as the wiring has already been done. The installer need only attach the correct plug based on the desired voltage and couple the plug to the transformer. Further, the manipulation of thick wires is also avoided by the installer, further simplifying the installation process.

Abstract: The present document relates to power converters with multiple feedback loops. The present document relates to a power converter with at least two feedback loops. The power converter may comprise a first error amplifier and a first capacitive element. The power converter may comprise a second error amplifier and a second capacitive element, wherein the second error amplifier is configured to generate, based on a second reference value and a second feedback signal, a second error current for charging the second capacitive element. The power converter may comprise a selector circuit configured to generate a selection signal by comparing a first voltage of the first capacitive element and a second voltage of the second capacitive element. The power converter may comprise a first track amplifier circuit configured to establish an additional current path from a supply rail to the first capacitive element for accelerated charging of said first capacitive element.

Abstract: A power supply includes a voltage converter to produce an output voltage to power a load. The power supply further includes a reference voltage generator and a controller. The reference voltage generator is operative to generate a floor reference voltage that varies as a function of the output voltage depending on a setting of one or more adjustable (programmable) resistor-capacitor paths in the floor reference voltage generator. The controller produces control signals to control the voltage converter as a function of the floor reference voltage and the output voltage.

Abstract: The invention relates to a pod propulsion device including a motor casing (3) and a strut (2), which strut (2) is connected at a lower part thereof to the motor casing (3) and is arranged to be connected at an upper part thereof to a hull (1) of a ship. The motor casing (3) includes a housing (6) enclosing an electric motor (5) with a stator and a rotor, which housing (6) has an upper portion. According to the invention a stationary heat conducting means (7) is arranged in contact with said upper portion, which heat conducting means (7) is arranged to conductively connect the upper portion to at least one outer wall (21) of the strut (2). The invention also relates to a ship provided with such pod propulsion device and to a method for cooling a pod propulsion device.

Abstract: A converter for converting a three-phase AC input into a DC output may include three phase input terminals and two output terminals, a phase selector for connecting the three-phase AC input to an upper intermediate node, a lower intermediate node, and a middle intermediate node. The phase selector includes semiconductor switches for selectively connecting the middle intermediate node to the three phase input terminals, and a controller. The electrical converter includes a boost circuit and a buck-boost circuit. The boost circuit includes an upper boost circuit, a lower boost circuit, and a common node. The buck-boost circuit has an output connected to the two output terminals in parallel with an output of the boost circuit, and includes at least two semiconductor switches that are actively switchable and connected in series across the output terminals. The middle intermediate node is connected to a common node of the two second semiconductor switches.

Abstract: An air intake port has an opening part and an air intake port cover forming an air flow channel from the opening part to the air intake port. The air intake port cover has a guide plate to block the opening part and the air intake port from each other and leave an air flow path between the guide plate and an outer perimeter surface facing a vehicle body, a discharge port formed in the outer perimeter surface, a discharge port cover separating the discharge port and the air intake port from each other, and leaving an air flow path from the opening part to the discharge port, and a pair of cylindrical members, one end of each being connected to two holes formed in the discharge port cover, and the other ends facing each other in a travel direction, and tapering in cross-sectional area.

Abstract: A buck-boost power converting system includes a voltage source input for connecting a voltage source for power conversion. A plurality of switches are connected electrically to the voltage source input, wherein each switch is connected to a controller configured for control of the switches. A voltage output is configured to connect to a load to power the load with converted power from the voltage source input, wherein the controller is configured to provide positive voltage or negative voltage at a desired level to the voltage output, as needed.

Abstract: An intermediate circuit current of a power converter is determined as precisely as possible in a simple and inexpensive manner. The intermediate circuit current is determined as a function of a detection of the measured output voltages and output currents of the individual phases.

Abstract: A power conversion device includes a plurality of conversion units electrically connected in parallel to each other and configured to perform voltage conversion of electric power supplied from a power supply and a control device configured to set a conversion unit that will operate within the plurality of conversion units, wherein, after the number of conversion units that are operating within the plurality of conversion units is increased, the control device makes an electric current flowing through an operation start conversion unit which is a conversion unit that has started to operate from a non-operating state larger than an electric current flowing through an operation maintenance conversion unit which is a conversion unit that continues to operate before and after the number of operating conversion units is increased.

Abstract: A power conversion device of an embodiment includes a power conversion unit, a first capacitor, a gate circuit, a bypass circuit, and a discharging circuit. The power conversion unit includes a plurality of switching elements each having a gate and generates alternating current (AC) power from direct current (DC) power supplied to a provided DC input terminal. The first capacitor is provided on a DC input side of the power conversion unit. The gate circuit includes a drive circuit configured to output a gate drive signal to be supplied to gates of one or more switching elements among the plurality of switching elements and a second capacitor configured to smooth a power supply voltage of power to be supplied to the drive circuit. The bypass circuit causes the second capacitor to be charged with a part of power stored in the first capacitor at the time of power supply loss of a control system circuit and enables the gate drive signal to be maintained in a negative bias by power stored in the second capacitor.

Abstract: In response to a problem wherein a voltage of a capacitor of a power conversion device decreases when a voltage of an alternating current power supply is restored after once decreasing, the voltage of the capacitor drops below a maximum value of the voltage of the alternating current power supply when power is restored, and an inrush current occurs, the power conversion device, provided between an alternating current power supply and a load, is such that a decrease in an input voltage or an input current of a power converting unit is detected, a change in the voltage of the capacitor is predicted, and operations of the power converting unit are caused to stop before the voltage of the capacitor drops to or below the maximum value of the voltage of the alternating current power supply, thereby restricting an occurrence of an inrush current.

Abstract: This power supply unit of a control system outputs a notification signal to a calculation unit when a time in which an input voltage becomes smaller than a threshold voltage exceeds a prescribed first measurement time. When detecting that a predetermined second measurement time has elapsed after the notification signal has been received, the calculation unit outputs an instruction signal instructing the execution of a process before a stop in preparation for a prescribed stop of power supply, and executes the process before the stop in place of the current process. Settings of the threshold voltage and the second measurement time are configured to be changeable by means of an external operation.

Abstract: An AC-DC power converter can include an AC-DC converter stage, such as a flyback converter, configured to receive an AC input voltage and deliver a DC output voltage. The converter can include an active capacitor bank (ACB) coupled to the output of the AC-DC stage. The ACB can include an energy storage capacitor and a plurality of switching devices operable as a bidirectional converter to alternately charge the capacitor from the DC output or discharge the capacitor to maintain output DC voltage regulation. The converter can also include control circuitry responsive to the AC input voltage to selectively: (1) enable the AC-DC stage and operate the switching devices to charge the capacitor from the DC output voltage; (2) and disable the AC-DC stage and operate the switching devices to discharge the capacitor to maintain DC output voltage regulation.

Abstract: Certain embodiments involve a modular medium voltage fast charger. The modular medium voltage fast charger can include: (1) a predictive power factor correction (“PFC”) controller (or predictive controller) for series-interleaved multi-cell three-level boost (“SIMCB”) converters, (2) an active neutral point clamped (“NPC”) dual active bridge (“DAB”) modulation scheme to achieve soft switching, (3) an auxiliary capacitor to reduce NPC DAB turn-off voltages, (4) a comprehensive and scalable protection circuit, and (5) a high-isolation pulse transformer with a bobbin for reducing coupling capacitance of the pulse transformer.

Abstract: When an inverter and a converter are merely operated with their carrier waves synchronized with each other, current ripple of a smoothing capacitor connected therebetween might be increased. Accordingly, bipolar modulation PWM control is performed on the inverter, PWM control is performed on the converter, and the phase of the carrier wave for the inverter or the converter is shifted on the basis of AC output, whereby timings of currents flowing into the smoothing capacitor are made different from each other.

Abstract: Provided are examples of electromagnetic interference (EMI) filters for reducing radiated EMI in power converters. An example EMI filter includes a common mode (CM) choke located on an input cable connected to a first side of a converter a first set of Y-capacitors located between a primary ground (PGND) node of the converter and a secondary ground (SGND) node of the converter, and a second set of Y-capacitors located between the first side of the converter and the SGND node. A first shielding may be connected to the SGND node. One or more additional shieldings may be inside the first shielding and connected to one of the PGND node or the SGND node. The converter may be one or more of an isolated converter, an LLC resonant power converter, a Flyback converter, a forward converter, or a push-pull power converter.

Abstract: A power distribution system and method has a controller and at least one semiconductor switch. The power distribution system additionally has an on status detector which detects the status of the semiconductor switches, and an overcurrent status circuit which checks for overcurrent conditions.

Abstract: An apparatus for supplying power to a high-capacity load includes a three-to-two phase transformer including an input side three-phase transformer terminal for connection to a three-phase supply grid and output side first and second output-side single-phase transformer terminals. A converter arrangement has a first partial converter including a first input-side, single-phase AC voltage terminal for the first output-side transformer terminal and a first single-phase output terminal. A second partial converter has a second input-side single-phase AC voltage terminal for the second output-side transformer terminal and a second single-phase output connector. The partial converters are mutually connectable by the output terminals in an output-side series and/or parallel circuit and form a single-phase load terminal for the high-capacity load. A method for supplying power to a high-capacity load is also provided.

Abstract: An air circulation and ventilation apparatus for a food processing machine (70), and the air circulation and ventilation apparatus comprises: a motor (10) and a fan (30), in which the motor (10) is used for driving an agitating or pulverizing assembly and is arranged within a base of the machine, and a body (60) of the machine is disposed outside the base, and the gap between the body (60) and the outer side wall of the base forms an air inlet passage; the fan (30) is equipped with a driving motor and is arranged within the base, and under the effect of the fan (30), airflow enters the air inlet passage by means of an air inlet port (22) on the base and flows through the motor (10) within the base and is discharged from an outlet port (23) on the base.