Abstract: A power supply device and a power supply method are provided. The power supply device is configured to generate a first feedback signal according to an output power source, and operate in a skip mode (or called burst mode) according to the first feedback signal. The power supply device is configured to obtain an overall efficiency according to an input power and an output power, and obtain a difference between the overall efficiency and a preset efficiency. When an output current value of the output power source is within a predetermined range and the difference is greater than a first value, the power supply device generates a second feedback signal and stops operating in the skip mode according to the second feedback signal.

Abstract: In a powered device (PD), four MOSFETs are used in a rectifier circuit. The four MOSFETs are disposed based on a premise that an electric potential of a contact pair 1-2 is lower than that of a contact pair 3-6 and an electric potential of a contact pair 7-8 is lower than that of a contact pair 4-5, so that a PoE current of each contact group passes through only two of the MOSFETs but does not pass through a diode.

Abstract: A matrix converter system having a current control mode operation is provided. The matrix converter system includes a matrix converter that includes a plurality of switches. A unity current reference vector having an amplitude of one is determined that defines an angle and frequency of an output current vector as a function of a reference phase angle, which is a function of the output current vector and an output voltage vector representing feedback signals of a multiphase signal output to a load. The unity current reference vector is used to control the matrix converter, to cause the output current vector to be aligned with the unity current reference vector. A unity voltage reference vector having an amplitude of one is provided that defines a reference angle and frequency as a function of a zero phase angle. The output voltage vector and the unity voltage reference vector are aligned to determine the reference phase angle as an angle between the aligned output voltage vector and the output current vector.

Abstract: A voltage reducing circuit includes a power switch circuit portion having high-side and low-side field-effect-transistors connected at a switch node. The power switch circuit portion has an on-state wherein the high-side transistor is enabled and the low-side transistor is disabled and, vice versa, an off-state. An energy storage circuit portion including an inductor connected to the switch node is arranged to provide an output voltage. A timer determines a falltime duration required for the output voltage to fall to a threshold value. A controller switches the voltage reducing circuit between a first mode of operation in which a periodic pulse width modulated drive signal is applied to the high-side and low-side field-effect-transistors; and a second mode of operation in which a pulse is applied to the high-side and low-side field-effect-transistors only if the output voltage reaches the threshold value.

Abstract: When a voltage-fluctuation suppression device suppresses, for input/output of connected power between a first power grid, or a commercial power grid, and a second power grid including a power generation device and grid-connected to the first power grid, voltage fluctuations in the first power grid, a control unit includes a voltage allowable range computing unit, controls a ratio between active and reactive power output by the voltage-fluctuation suppression device to be equal to a ratio between active and reactive power of power flowing between the first and second power grids, and controls the ratio between the active and reactive power output by the voltage-fluctuation suppression device to be equal to the ratio between the active and reactive power of power flowing between the first and second power grids.

Abstract: A power conversion system at least includes a filter capacitor, a DC-DC converter, a smoothing capacitor, a housing and a refrigerant flow channel. The refrigerant flow channel is disposed between the housing and a flow channel cover. The refrigerant flow channel includes a converter facing portion at least partially facing the DC-DC converter. The filter capacitor at least partially overlaps with the DC-DC converter when viewed in a first direction from an opposite side of the refrigerant flow channel to the converter facing portion. The smoothing capacitor does not overlap with the DC-DC converter when viewed in the first direction and partially overlaps with the DC-DC converter when viewed in a second direction. At least two fastening sections fasten the flow channel cover to the housing and do not overlap with the smoothing capacitor when viewed in the first direction.

Abstract: A solar drive system, having: at least one photovoltaic array generating a DC current; at least one inverter electrically connected to the photovoltaic array for inverting the DC current into an AC current; at least one electric motor electrically connected to the inverter for supplying the electric motor with the AC current; and at least one device for determining a present rotational frequency of the electric motor; wherein the inverter is configured to track a maximum power point of the photovoltaic array by performing a Perturb and Observe Maximum Power Point Tracking method and to determine a step direction of the Perturb and Observe Maximum Power Point Tracking method using the determined present rotational frequency of the electric motor.

Abstract: In described examples, a system regulates provision of DC-DC electrical power. The system includes a DC-DC converter, an input voltage node to receive an input voltage, a current source, a voltage source node, and a ground switch. The DC-DC converter includes a flying capacitor and multiple converter switches. The current source is coupled between the input voltage node and a top plate of the flying capacitor, to provide current to the top plate when the current source is activated by an activation voltage. The voltage source node is coupled to the input voltage node and to the current source, to provide the activation voltage to the current source, such that the activation voltage is not higher than a selected voltage between: a breakdown voltage of the converter switches; and a maximum value of the input voltage minus the breakdown voltage. The ground switch is coupled between a bottom plate of the flying capacitor and a ground.

Abstract: According to various embodiments, a DC/DC conversion system is disclosed. The DC/DC conversion system includes a boost converter coupled to a plurality of parallel buck converters. The boost converter and plurality of buck converters each include an inductor, where the inductors are magnetically coupled to each other. The DC/DC conversion system further includes a control system configured to control the boost converter and plurality of buck converters such that combined duty cycles of the plurality of buck converters are about equal to a duty cycle of the boost converter and the duty cycles of the plurality of buck converters are modulated out of phase.

Abstract: A method for controlling a value of a voltage at a conductor to which at least one secondary winding of a first steppable transformer and a secondary winding of a second steppable transformer are connected is provided. The method includes: if a voltage deviation of the voltage at the conductor from a voltage setpoint value is within a first range around the voltage setpoint value, and if an overall deviation of a sum of the voltage deviation and a reactive current deviation from the voltage setpoint value respectively for the first and the second transformer is outside of a second range, which is larger than the first, around the voltage setpoint value: setting a delay time for stepping the first transformer and/or the second transformer in such a way that stepping of the first or the second transformer that counteracts the voltage deviation is prioritized.

Abstract: The power supply apparatus having a current resonance circuit includes a charge unit connected to a primary winding of a transformer, and storing electric charge, and a connection unit connected in series with the charge unit, and configured to switch the charge unit between a connecting state in which one of charging and discharging is enabled, and a non-connecting state, and after making the connection unit into the connecting state, while a current is flowing into either one of the first diode and the second diode, the first control unit performs transition from a halt period to an operating period of a switching operation by turning ON the switching element of the one of the first diode and the second diode, the current being flowing into the one of the first diode and the second diode.

Abstract: Control circuits and methods to operate a switch of a DC-DC converter, including an output circuit to turn the switch off to control a peak inductor current in a given switching control cycle, and a modulation circuit to implement transition mode (TM) or continuous conduction mode (CCM) operation for a given switching control cycle by causing the output circuit to turn the switch on in response to an earlier one of a first signal, that represents an inductor current of the DC-DC converter, decreasing to a reference voltage that represents a zero crossing of the inductor current for the TM operation or the first signal decreasing to a valley reference signal that represents a non-zero value of the inductor current for the CCM operation.

Abstract: Detecting an output voltage of a switching power supply can include: acquiring a first branch current that changes with a first voltage at a first terminal of an inductor of the switching power supply; acquiring a second branch current that changes with a second voltage at a second terminal of the inductor; controlling the first and second branch currents to flow to a same detection terminal; and detecting the output voltage based on a first current flowing through the detection terminal during a first time period, and a second current flowing through the detection terminal during a second time period.

Abstract: A power controller in a switching mode power supply dynamically performs high-voltage charging to maintain an operating voltage. The power controller includes a PWM signal generator, a high-voltage charging circuit, and a high-voltage charging controller. The PWM signal generator provides a PWM signal to a power switch to perform power conversion regulating an output voltage of the switching mode power supply at a voltage rating. The high-voltage charging circuit has a high-voltage-tolerant switch connected between a line voltage and the operating voltage, wherein rectifying an AC voltage generates the line voltage. The high-voltage charging controller turns ON the high-voltage-tolerant switch to perform high-voltage charging at the same time when performing the power conversion. The high-voltage charging directs a charging current from the line voltage through the high-voltage-tolerant switch to charge the operating voltage.

Abstract: Fault protection of a voltage source converter is provided. An apparatus has a chain-link circuit in series with a director switch. The chain-link circuit includes cells including an energy storage element and cell switching elements connected with anti-parallel diodes. Each cell switching element has a cell switching element controller. The director switch includes director switch units, each having a director switching element and a director switch unit controller. Each cell switching element controller monitors for a fault current and turns-off its associated cell switching element and reports a fault event to a fault controller. Each director switch unit controller monitors for a fault current and reports a fault event to the fault controller but the director switch unit control keeps its associated director switching element turned-on. The fault controller monitors for reports of fault events to order the cell switching elements of at least some of the cells to turn-off.

Abstract: A DC-DC converter includes: a first switch; a second switch connected to the first switch; a mode selecting circuit to select a converting mode from one of at least a first mode and a second mode based on an input voltage; and a controller to generate a first switching control signal for controlling the first switch based on the converting mode, and a second switching control signal for controlling the second switch based on the converting mode.

Abstract: A control system of a low voltage DC-DC converter is provided. The system includes a low voltage DC-DC converter unit that has a power semiconductor element and converts power supplied from a high voltage battery of a vehicle into power of low voltage. A switching frequency change unit changes a switching frequency of the power semiconductor element and a microcomputer generates a final PWM signal based on an input voltage value input from the high voltage battery and an output voltage value of the switching frequency change unit to apply a maximum duty command voltage to a PWM controller. The PWM controller applies PWM voltage to the power semiconductor element to thus operate the power semiconductor element at less than a maximum duty based on the maximum duty command voltage applied from the microcomputer.

Abstract: A power converter includes a power module having a positive electrode of a positive-side switching device connected to a first terminal, a negative electrode of the positive-side switching device and a positive electrode of a negative-side switching device connected to a second terminal, and a negative electrode of the negative-side switching device connected to a third terminal. The first terminal is connected to a P terminal of a filter capacitor via a first conductor of a bus bar that is a parallel flat plate conductor. The third terminal is connected to an N terminal of the filter capacitor via a second conductor of the bus bar. The bus bar as the parallel flat plate conductor has an L shape. The second terminal is connected to a load via a conductor bar physically different from the bus bar.

Abstract: A power supply unit includes primary and secondary circuits and a transformer. The primary circuit is connected to an alternating-current power supply and includes a switching device. The transformer includes primary and secondary windings. The primary winding receives an alternating current so that an alternating current is induced in the secondary winding. The received alternating current is generated through switching using the switching device. The secondary circuit rectifies, for output, the alternating current induced in the secondary winding. The primary winding includes first and second windings. When the alternating-current power supply is a power supply of a first voltage, the first winding is connected to the second winding in parallel in the primary winding. When the alternating-current power supply is a power supply of a second voltage higher than the first voltage, the first winding is connected to the second winding in series in the primary winding.

Abstract: A controller for use in a power converter with multiple outputs includes a discharge detect circuit coupled to receive a voltage signal from a transformer winding of the power converter to output a discharge signal in response to the voltage signal. A multi-output signal process and interface block is coupled to output request signals to the output selection drive and idle ring visibility logic circuit. An output selection drive and idle ring visibility logic circuit is coupled to receive the discharge signal from the discharge detect circuit and the output request signals from the multi-output signal process and interface block. An idle ring detection circuit is coupled to one of the plurality of output switches and coupled to output an idle ring output signal to generate a next request pulse.