Abstract: A power supply system includes a power factor correction converter circuit and an isolated power converter circuit, wherein the power factor correction converter circuit corrects the power factor of a rectified power to generate a first output power, and the isolated power converter circuit converts the first output power to generate a second output power. The isolated power converter circuit includes a transformer, and the transformer includes a primary winding, a secondary winding, and an auxiliary winding. The auxiliary winding generates an auxiliary voltage which is related to the second output power. When the auxiliary voltage is lower than a disabled threshold, indicating that the voltage of the second output power is lower than a threshold, the power factor correction converter circuit provides a bypassing connection from the rectified power to the first output power and stops correcting the power factor of the rectified power.

Abstract: In a power conversion system, a first power converter is connected between a first AC power system, and a first DC main line and a DC return line. A second power converter is connected between the first AC power system, and the DC return line and a second DC main line. A first control device controls the first power converter in accordance with a first active power command value. A second control device controls the second power converter in accordance with a second active power command value. A common control device sets the first active power command value and the second active power command value by distributing a command value of total active power output from the entire power conversion system to the first AC power system. The common control device makes the first active power command value and the second active power command value different from each other.

Abstract: A control method for a synchronous BUCK circuit is disclosed, including: obtaining an input voltage, an output voltage and an output current of the synchronous BUCK circuit; obtaining a current state of the synchronous switch transistor; obtaining a turn-off current threshold when the synchronous switch transistor is in an on state; switching the synchronous switch transistor to an off state when the output current is less than the turn-off current threshold; calculating a duty ratio of a main switch transistor according to the input voltage, the output voltage and the turn-off current threshold; and generating a corresponding driving signal according to the duty ratio, to control the synchronous BUCK circuit.

Abstract: An apparatus for enabling a two-stage inverter to switch between modes includes: a first inverter unit, a second inverter unit, a load connected between the first inverter unit and the second inverter unit, a mode switching unit connected between the load and the second inverter unit, and a control unit configured to drive the load in an one-stage inverter mode or a two-stage inverter mode by performing a control that turns on or off the mode switching unit.

Abstract: A power conversion system includes an inverter circuit, a harmonic reducer, and a synchronizer. The inverter circuit is operable with electric power supplied from an alternating-current power source. The harmonic reducer is connected to the alternating-current power source. The inverter circuit includes a circuit main portion and a conversion control unit configured to control the circuit main portion. The harmonic reducer includes a current control unit configured to perform control to reduce a harmonic current flowing to the alternating-current power source. The synchronizer is configured to synchronize a state of the harmonic reducer with a state of the inverter circuit.

Abstract: A switch-mode DC-DC power converter including an input port and an output port, wherein the switch-mode DC-DC power converter includes a hard-switching circuit. The switch-mode DC-DC power converter further includes a first capacitance, a first inductance and a soft-switching circuit. The first capacitance is coupled in parallel across one of input and output ports at one side of the hard-switching circuit whereas the first inductance is coupled in series with another of the input and output ports and the hard-switching circuit at a second side of the hard-switching circuit opposite the first capacitance. A soft-switching circuit includes a second capacitance, a second inductance, a first rectifying element and a controlled discharger. The first rectifying element is coupled to the second inductance and the second capacitance. The controlled discharger is coupled to the second capacitance.

Abstract: A reactive power compensation device includes a power converter and a converter control unit, and compensates reactive power of an AC power grid by output reactive power of the power converter. The converter control unit includes an AC voltage detection unit and an output limit unit. The AC voltage detection unit detects voltage information of the AC power grid to which the power converter is connected. The output limit unit determines whether or not the output reactive power of the power converter needs to be limited, on the basis of the voltage information detected by the AC voltage detection unit, and in a case where the output reactive power needs to be limited, limits the output reactive power of the power converter.

Abstract: A carrier wave generation unit comprising a wideband RF power supply divides a whole modulation wave variable frequency range into a plurality of modulation wave frequency sections associated with the number of PWM pulses N based on upper and lower limit frequencies of a carrier wave. In each modulation wave frequency section, an integer number of PWM pulses N associated to each modulation wave frequency section and the modulation wave frequency fs are used to vary a carrier wave frequency fc based on the relationship of fc=N·fs, thereby synchronizing the frequency between a carrier wave C and a modulation wave S to satisfy periodicity.

Abstract: In a multi-level hybrid DC-DC converter with a flying capacitor, a feedback circuit includes a first oscillator and produces a first clock signal with a frequency dependent on an output voltage. A second oscillator produces a second clock signal having a frequency dependent on a reference voltage. A logic circuit switches, as a function of the first and second clock signals, connection of the flying capacitor between one state where the flying capacitor is connected between an input node and a switching node, and another state where the capacitor is connected between the switching node and a ground node. The duty cycle of the first/second clock signal varies so that when the flying capacitor voltage is lower than a target voltage a duration of the one state is increased, and when the flying capacitor voltage is higher than the target voltage a duration of the another state is increased.

Abstract: A voltage converter circuit includes rectifier filter circuit, power factor (PFC) converter circuit, full-half bridge resonance converter circuit, voltage regulation control circuit, and voltage feedback control circuit. The PFC converter circuit is configured to convert the rectified and filtered voltage of the rectifier filter circuit to PFC voltage according to first gain. The full-half bridge resonance converter circuit is configured to convert the PFC voltage to a supply voltage according to second gain. The voltage regulation control circuit is configured to generate three voltage regulation signals according to output voltage. The PFC converter circuit is configured to adjust the first gain according to a first voltage regulation signal. The full-half bridge resonance converter circuit is configured to operate in one of three resonance modes according to a second voltage regulation signal.

Abstract: Embodiments herein relate to identifying, by phase current balancing (PCB) circuitry, an indication of whether a measured current of a pulse-width modulated (PWM) signal of a plurality of PWM signals is greater than or less than an average current of the plurality of PWM signals. Embodiments further relate to adjusting, by the PCB circuitry, a bias-value of a non-modulated edge of a duty cycle of the PWM signal. Other embodiments may be described and claimed.

Abstract: A circuit for Flyback switching power supply includes a transformer having a primary winding, a secondary winding and an auxiliary winding, a power switch coupled to a dotted terminal of the primary winding, and a switch. A first terminal of the switch is connected to a non-dotted terminal of the auxiliary winding through a capacitor, a second terminal of the switch and a dotted terminal of the auxiliary winding are connected, respectively, to a ground. A common node of the capacitor and the auxiliary winding is configured to connect to a non-dotted terminal of the primary winding. A control circuit is configured to generate, based on a voltage at the common node of the capacitor and the auxiliary winding, a control signal to control the switch in order to achieve zero voltage switch (ZVS) of the power switch.

Abstract: A snubber circuit according to an embodiment of the present invention, which is connected to a secondary side switch of a transformer, comprises: a diode connected to an input terminal of the secondary side switch; a capacitor connected to an output terminal of the diode; a resistor connected in parallel with the capacitor; and a snubber switch for connecting the resistor and ground.

Abstract: According to an embodiment, a power converter (1) includes a main circuit (10), an electrification control unit (25), and an analysis unit (24). The main circuit includes a plurality of switching devices (Q1 to Q4), converts direct-current power into multiphase alternating-current power through switching of the plurality of switching devices, is able to supply the multiphase alternating-current power to an alternating-current load (2) connected to an output side, and output a detection result of a device short circuit current flowing in each of the plurality of switching devices. The electrification control unit electrifies the plurality of switching devices for a predetermined time based on one of a plurality of pre-decided analysis test electrification patterns.

Abstract: A DC-DC boost converter includes an inductor coupled between an input voltage and an input node, a first path coupled between the input node and a first output node at which a first output voltage is generated, and a second path coupled between the input node and a second output node at which a second output voltage is generated. The DC-DC boost converter operates in a first operating phase where the first path boosts the first output voltage and where the second path is kept from boosting the second output voltage by the second path being coupled to the first path, and operates in a second operating phase where the second path boosts the second output voltage and where the first path is kept from boosting the first output voltage by the second path not being coupled to the first path.

Abstract: A flyback voltage converter comprising an inductive winding, a main switch coupled in series with the inductive winding via a common node, and a snubber circuit coupled in parallel with the inductive winding and comprising a controllable switch having a gate and a source, wherein the gate is coupled with the source to prevent the controllable switch from turning on. A control circuit is coupled with the main switch and configured to turn the main switch on and off to convert an input voltage to an output voltage distinct from the input voltage.

Abstract: A surge protecting circuit is provided. A first stage filter circuit is connected to an alternating current (AC) source. A surge detection driver circuit is connected to a first stage filter circuit. A first snubber circuit is connected to the AC source. A first terminal of a first power switch is connected to the first snubber circuit. A control terminal of the first power switch is connected to the surge detection driver circuit. A first terminal of a second power switch is connected to a second snubber circuit. A second terminal of the second power switch is connected to an output terminal of the surge protecting circuit. A control terminal of the second power switch is connected to the surge detection driver circuit. A multi-stage filter circuit is connected to a second terminal of the first power switch and the second snubber circuit.

Abstract: The present disclosure refers to direct current-to-direct current (DC-DC) converters and power supplies including the same. In an embodiment, a DC-DC converter includes a first switching circuit, a second switching circuit, a fourth capacitor coupled to a second node, and an inductor-capacitor (LC) filter coupled to a third node. The first switching circuit includes a first transistor coupled between a first capacitor and an input node, a second transistor coupled between the first capacitor and a second capacitor, a third transistor coupled between a first node and a third capacitor, and a fourth transistor coupled between the third capacitor and a ground node. The second switching circuit includes a fifth transistor coupled between the second capacitor and the third capacitor, a sixth transistor and a seventh transistor coupled between the first capacitor and the third capacitor, and an eighth transistor coupled between the first capacitor and the ground node.

Abstract: The present application provides a power supply system for supplying power to network device, comprising power supply module, housing, and stereoscopic accommodating space therebetween. The power supply module without a fan comprises: a primary circuit comprising at least one primary switch and configured to receive AC input voltage and convert the AC input voltage into a first voltage; a transformer comprising primary and secondary windings and configured to convert the first voltage into a second voltage, the primary winding is coupled to the primary circuit; and a secondary circuit comprising at least one secondary switch and configured to convert the second voltage into a DC output voltage for the network device, the secondary circuit is coupled to the secondary winding, the secondary switch adopts SMT package, and power density of the power supply module is 60 W/inch3 or more. The stereoscopic accommodating space is filled with liquid coolant for cooling.

Abstract: The system proposed in this invention allows the conversion of energy from an AC/DC source, located on a platform (surface) and transmitted through an umbilical to a robot that operates on flexible lines, converting the electrical voltage to levels suitable for supplying the robotic system, and can also be used for supplying other pieces of equipment that operate with low voltage and require power high-density and protection against voltage transients. The system of the invention consists of a surface source (2), fed by the platform's three-phase grid (1), an umbilical cable (3), which connects the source to the robot, an overvoltage protection circuit (4), and a two-stage conversion modular system (5 and 6).