Abstract: Electric power devices and control methods are provided which automatically select a line voltage or phase voltage of an AC voltage supply. The electric power device includes a switchable circuit, a sensor and a switch control. The switchable circuit connects to the AC voltage supply, and includes multiple switchable elements. The sensor ascertains a voltage level of the AC voltage supply, and the switch control automatically establishes a configuration of the switchable circuit through control of the multiple switchable elements. The switch control couples the electric power device in a line-line (delta) configuration to the AC voltage supply when the voltage level is in a first voltage range, and a line-neutral (wye) configuration when the voltage level is in a second voltage range.

Abstract: A constant on-time controller has a voltage divider, a current ripple extractor, a one-shot on-timer, a comparator and a flip flop. The voltage divider generates a feedback voltage according to a regulator output voltage. The current ripple extractor senses a current in an energy storage inductor of a buck regulator flowing through flowing through an output capacitor's ESR, and generates an extracted ripple current having no DC component accordingly. The one-shot on-timer outputs a constant-on time control signal according to a buck regulator input voltage and the regulator output voltage. The modulation circuit outputs a modulation signal according to a reference voltage signal, the feedback voltage and the extracted ripple current. The flip flop generates a control signal to the buck regulator according to the modulation signal and the constant-on time control signal. An off-time of the buck regulator is determined according to the modulation signal.

Abstract: A zero current detection circuit includes: one detection winding that is magnetically coupled to a boost inductor of a bridgeless totem pole PFC for converting an AC input voltage to a DC output voltage, has one end connected to ground, and generates a zero current detection signal, which changes in proportion to a boost inductor voltage, at another end; a resistor with one end connected to the other end of the detection winding; a clamp composed of two diodes connected to each other in series with a same forward direction, which clamps the inputted zero current detection signal to the ground potential and a positive power supply voltage to convert to a rectangular signal; and a pulse outputter with a comparator which compares the rectangular signal and a comparison voltage and outputs detection pulses with falling edges that are synchronized with an inductor current reaching zero.

Abstract: A power supply device includes a voltage converting circuit and a mode switching circuit. The voltage converting circuit is configured to receive a first voltage and convert the first voltage to a second voltage. The mode switching circuit is configured to provide an output voltage and an output current to a load according to the second voltage. The mode switching circuit includes a switch configured to maintain on or off on the condition that the power supply device is operated under a constant voltage output mode such that the value of the output voltage corresponds to the second voltage, and the switch is configured to switch between on and off on the condition that the power supply device is operated under a constant current output mode such that the output current of the mode switching circuit is a constant value.

Abstract: An apparatus and method for reducing an output voltage ripple of a converter are provided. The apparatus may include a controller for controlling a converter, wherein the controller may include a clock generating circuit that generates a periodic clock signal containing periodic clock pulses, and a control circuit that causes the clock generating circuit to asynchronously initiate a clock pulse based on a difference between a feedback voltage of the converter and a reference voltage. The apparatus may also include an on-time modulation circuit which modulates the on-time based on the difference between the reference voltage and the sampled output voltage.

Abstract: A ZVS (zero voltage switching) control circuit for use in a flyback power converter includes a primary side controller and a secondary side controller. The primary side controller generates a switching signal to control a power transformer through a power transistor to generate an output voltage. The secondary side controller generates an SR (synchronous rectifier) signal to control an SR transistor at a secondary side of the power transformer. The SR signal includes an SR-control pulse and a ZVS pulse. The SR-control pulse controls the SR transistor according to a demagnetizing period of the power transformer. The ZVS pulse determines the starting timing of the switching signal to achieve zero voltage switching for the power transistor. The secondary side controller generates the ZVS pulse after a delay time from when the power transformer is demagnetized. The delay time is determined according to an output load of the output voltage.

Abstract: A method includes generating a first ramp signal for controlling a first portion of a converter, generating a second ramp signal for controlling a second portion of the converter, controlling a state of a first switch of the first portion through comparing the first ramp signal to a control signal and a state of a first switch of the second portion through comparing the second ramp signal to the control signal and determining a switching cycle of the converter through comparing a current flowing through an inductor of the converter to a threshold.

Abstract: A method and a system sense at least one phase difference between at least two phases of a group of parallel connected three phase AC output terminals (e.g., a first phase AC output terminal, a second phase AC output terminal, or a third phase AC output terminal). The parallel connected AC output terminals may be three parallel connected DC to AC three phase inverters. Features of the parallel connected three phase AC output terminals enable wiring of conductors to one phase of an AC output terminal to be swapped with wiring of conductors of one phase of another phase AC output terminal. A sign of at least one phase difference is verified different from signs of other phase differences thereby the system determining the lateral position of the at least one three phase inverters relative to at least one other of the three phase inverters.

Abstract: Power conversion systems and a controller thereof includes a first processing system that computes phase references for respective phase lines of an inverter according to a feedback value, a setpoint value, and a scaling factor to emulate a scaled frequency that is less than a switching frequency, and a second processing system that generates a carrier waveform having the switching frequency, receives the phase reference from the first processing system for each inverter phase line, and compares each phase reference with the carrier waveform to generate pulse width modulated switching control signals for switching devices of the inverter.

Abstract: An apparatus includes a first switch leg connected between a first input terminal and a first output terminal, the first switch leg comprising serially connected switches. The apparatus also includes a second switch leg connected between a second input terminal and the first output terminal, the second switch leg comprising serially connected switches. The apparatus further includes a third switch leg connected between an input voltage midpoint and the first output terminal. A controller controls the first switch leg, the second switch leg and the third switch leg, wherein the controller is configured to disable the second switch leg for a first time period and alternately enable the first switch leg and the third switch leg during the first time period, and to disable the first switch leg for a second time period and to alternately enable the second leg and the third leg during the second time period.

Abstract: The invention relates to a method for controlling phase currents (iU_WR1, iv_WR1, iw_WR1) of a three-phase inverter (WR1), the phase currents (iU_WR1, iv_WR1, iw_WR1) of the inverter (WR1) being controlled by way of a direct hysteresis current control and a selected phase of the inverter (WR1) being additionally switched depending on a zero system current (i0_WR1) of the inverter (WR1).

Abstract: An apparatus for mitigating GIC (geomagnetically induced current) effects through a fuzzy logic controlled variable resistor. Under GIC conditions (or any unbalanced fault current condition), the GIC or unbalanced fault current flows through the neutral of a power transformer. It is detected by the fuzzy logic controller, which sends a signal to a switch to open. The resistor is in the circuit and impedes the flow of current through the neutral, thereby protecting the transformer from getting overheated.

Abstract: Power converters and method with reverse charge capability are presented. A power converter operates either in a buck mode for transferring electrical power from a first terminal of the power converter to a second terminal of the power converter, or in a boost mode for transferring electrical power from the second terminal of the power converter to the first terminal of the power converter. The power converter has several switching elements, a flying capacitor, an inductor, and a control unit. The switching elements couple the first terminal of the power converter and the flying capacitor, couple the first terminal of the flying capacitor and a first terminal of the inductor, couple the first terminal of the inductor and a second terminal of the flying capacitor and couple the second terminal of the flying capacitor and a reference potential. The control unit controls the switching elements.

Abstract: A power converter includes an AC power input line, an AC power output line, a neutral line, a first capacitor connected to the AC power input line and the neutral line, a first inductor connected to the AC power input line, a first bus, a second bus, a second capacitor connected to the first bus and the second bus, a first half-bridge circuit connected to the first bus, the second bus and the first inductor, a second half-bridge circuit connected in series with the first half-bridge circuit and connected to the AC power output line, a third half-bridge circuit connected in series with the first half-bridge circuit, a second inductor connected to the third half-bridge circuit and the neutral line, and a controller.

Abstract: A DC-DC converter can include: a switched capacitor converter including at least one switch group and at least one capacitor, where each switch group includes two switches coupled in series, and at least one capacitor is respectively coupled in parallel with a corresponding one of the switch groups; and a switch converter including a first magnetic component, where the switch converter is configured to share one of the switch groups, the first magnetic component is coupled to an intermediate node of the shared switch group, and the intermediate node is a common coupling point of two switches of the shared switch group.

Abstract: A system for providing resonance damping is disclosed. The system comprises a power generation circuit arranged to supply power to a direct current (DC) bus. The DC bus comprises a first link conductor and a second link conductor arranged such that a current induced in either of the conductors generates a magnetic field having a plurality of magnetic flux lines that extend in a direction generally perpendicular to a first direction of current flow. At least one electronic circuit is coupled to the DC bus. A damping element is coupled to or arranged proximate the first link conductor and the second link conductor of the DC bus, and is arranged such that the plurality of magnetic flux lines induces a plurality of eddy currents having a second direction of current flow in at least one surface of the damping element to provide resonance damping of the system.

Abstract: According to one embodiment, a voltage generation circuit includes a first boost circuit, a voltage division circuit, a first detection circuit, capacitor and a first switch. The first boost circuit outputs a first voltage. The voltage division circuit divides the first voltage. The first detection circuit is configured to detect a first monitor voltage supplied to the first input terminal, based on a reference voltage which is supplied to a second input terminal of the first detection circuit, and to control an operation of the first boost circuit. The capacitor is connected between an output terminal of the first boost circuit and the first input terminal of the first detection circuit. The first switch cuts off a connection between the capacitor and the first detection circuit, based on an output signal of the first detection circuit, until the first voltage is output from the first boost circuit.

Abstract: The disclosure describes techniques to send digital information from the secondary side to the primary side of a power converter, such as a flyback power converter. By modulating the amount of time between zero voltage switching (ZVS) pulses initiated by a synchronous rectification (SR) transistor on the secondary side, a power converter circuit of this disclosure may communicate digital information to the primary side from the secondary side. The power converter circuit of this disclosure may include stable, accurate and reliable ZVS pulse detection techniques on the primary side to determine slight changes in the period between ZVS pulses from the secondary side. A controller circuit on the secondary side may encode digital information by modulating the ZVS period, e.g. increased period, decreased period or no change to the period.

Abstract: An inverter apparatus includes a first switch, a second switch, a third switch, a fourth switch, a load detection unit, and a control unit. The first switch and the fourth switch form a first switch assembly, and the second switch and the third switch form a second switch assembly. The control unit selects a control mode to be that two switches of the first switch assembly are not turned off and at least one switch of the second switch assembly is turned off, or two switches of the second switch assembly are not turned off and at least one switch of the first switch assembly is turned off, or two switches of the first switch assembly and two switches of the second switch assembly are not turned off.

Abstract: Methods, apparatus, systems, and articles of manufacture are disclosed to regulate a switched mode power supply. An example power converter includes a first comparator, a ramp generator coupled to a first input of the first comparator, and a current balance circuit coupled to the ramp generator, the current balance circuit including a transistor including a first current terminal, a second current terminal, and a gate, a multiplier circuit coupled to the first current terminal, a second comparator coupled to the gate, a first current source coupled to the first current terminal and the multiplier circuit, and a second current source coupled to the second current terminal and the second comparator.