Abstract: The disclosure provides a multilevel port under-voltage protection circuit with flying capacitor, comprising: a first circuit unit having first to fourth power switches sequentially connected in series, wherein the first circuit unit is arranged a positive terminal and a negative terminal of a DC input port and each of the switches can tolerate a reverse current; a first flying capacitor having a first terminal connected to the common node of the first power switch and the second power switch in series, and a second terminal connected to the common node of the third power switch and the fourth power switch in series; and a first shunt element connected in antiparallel to the first power switch or the fourth power switch, wherein a pulse peak current tolerated by the first shunt element is greater than the reverse current tolerated by the first power switch or the fourth power switch.

Abstract: A power supply capable of protecting a rectifier circuit using a switching element from an overvoltage or an overcurrent is provided. The power supply includes a power input terminal; an output capacitor; a synchronous rectifier configured to rectify an AC voltage input through the power input terminal; a converter configured to convert the rectified AC voltage into a DC voltage following a preset voltage and supply the DC voltage to the output capacitor; and a protection circuit provided between the power input terminal and the output capacitor, and configured to supply an AC voltage higher than the voltage charged in the output capacitor to the output capacitor by bypassing the synchronous rectifier.

Abstract: A power supply unit where the main DC voltage output rail is incorporated within the enclosure of the power supply unit and some DC voltage output rails and DC-DC converters are located outside the enclosure of the power supply unit close to or directly at the input of the system board and input of associated system peripheral via integration into a cable harness assembly, to negate the voltage drop on the cable harness assembly, resulting in a lower power loss across the cable harness assembly, leading to an improvement in combined power supply unit and cable harness assembly efficiency.

Abstract: A power conversion device includes a semiconductor power converter that converts direct current power into alternating current power for a motor, a common-mode reactor having first and second auxiliary windings added thereto, the common-mode reactor reducing common-mode current that may flow between the semiconductor power converter and the motor, a signal generator that superimposes an alternating current on the first auxiliary winding, and a detection circuit that detects a saturation state of the common-mode reactor on the basis of the superimposed current superimposed on the first auxiliary winding and a winding voltage generated in the second auxiliary winding by the superimposed current.

Abstract: Certain aspects of the present disclosure provide a power supply circuit. The power supply circuit generally includes: a switched-mode power supply (SMPS) having an inductive element and a first switch coupled to the inductive element; a feedback path coupled between an output of the SMPS and a control input of the first switch; and a current limit circuit comprising a first capacitive element, a charge circuit coupled to the first capacitive element, a first current source, a first resistive element coupled to the first current source, the capacitive element being coupled to a node between the resistive element and the first current source, a sample-and-hold circuit coupled to the first capacitive element, and a clamp circuit coupled between the sample-and-hold circuit and the feedback path.

Abstract: An active clamp switching power converter circuit includes a primary-side sensing circuit that generates a sensed voltage based on an auxiliary winding voltage of an auxiliary winding around the core having a same polarity as the primary winding. Based on the sensed voltage, a controller controls switching of a power switch coupled to the primary winding to control current through the primary winding and controls switching of an active clamp switch to control leakage current when the power switch is turned off. The controller regulates timing of the switching to turn on the power switch based on timing of a zero voltage switching condition for power efficient operation.

Abstract: According to one aspect of the present disclosure, a single-stage converter includes a rectifying circuit and a buck-boost circuit. The buck-boost circuit includes an inductor with a center tap configured to supply an output of the buck-boost circuit to the rectifying circuit. The buck-boost circuit also includes first and second interleaved arms arranged in parallel with a voltage input of the single-stage converter. The first and second interleaved arms are each coupled to the inductor and include a plurality of switches operable to control the output of the buck-boost circuit.

Abstract: A power conversion device which includes an input terminal that receives a rectified AC power, an active power factor correction circuit including a switching element that turns on or off and boosts an input voltage to correspond to a turn on time, an output terminal connected to an output of the active power factor correction circuit. The power conversion device includes a comparator that compares an output voltage of the output terminal with a reference voltage and outputs a signal having a different magnitude depending on the comparison result, a control circuit that adjusts a duty cycle of the control signal depending on an output signal of the comparator, and a discharge circuit electrically connected between the input terminal and an output of the comparator, and when the input voltage is equal to or greater than a first specified voltage, that discharges the output of the comparator.

Abstract: Disclosed is a power converter circuit and a method for operating the power converter circuit. The power converter circuit includes at least one converter stage and a control circuit. The at least one converter stage includes an input configured to receive an input power, an output configured to supply an output power, a first electronic switch, and a first inductor coupled to the first electronic switch. The control circuit includes a hysteresis controller configured to drive the first electronic switch based on a current measurement signal representing a current through the inductor, a first threshold signal, and a second threshold signal, and an operating point controller configured to detect an operating point of the converter stage to generate the first threshold signal and the second threshold signal based on the detected operating point.

Abstract: Apparatus and associated methods relate to a Meissner Engine Regulator (MER) that includes a superconducting inductive element (SCIE) supplying a secondary winding coupled to recirculate excess energy from the SCIE core to a feedback winding controlled to regulate the SCIE magnetic field strength to be substantially at or below a critical magnetic field strength (HC). In an illustrative example, Hc may be the maximum field strength to obtain the Meissner effect in the SCIE. In some examples, the SCIE may be wound with n-filar windings. The SCIE may further include a first primary electrically coupled to and powered by a DC-to-AC power inverter, for example. The secondary winding may operate to remove excess energy from the magnetic field in the SCIE, for example, and store it in a capacitor. The SCIE may be supercooled, with liquid nitrogen, for example, such that the MER reaches electrical efficiencies approaching 100%.

Abstract: A method for controlling a switched tank converter (STC) includes (a) driving a first resonant tank circuit of the STC at a first frequency and with a first fixed on-time, to obtain a first fixed ratio of output voltage of the STC to input voltage of the STC, while the STC is powering a load having a first magnitude and (b) driving the first resonant tank circuit of the STC at a second frequency and with the first fixed on-time, to obtain the first fixed ratio of output voltage of the STC to input voltage of the STC while the STC is powering a load having a second magnitude. The second frequency is smaller than the first frequency, and the second magnitude is smaller than the first magnitude.

Abstract: A circuit to control the peak current of a single inductor multiple output (SIMO) power converter operating in continuous current mode (CCM) is disclosed. The circuit generates a peak-current threshold signal that can be raised or lowered based on an error signal generated by comparing output voltages to their respective regulated levels. Additionally, the circuit can lower the peak-current threshold signal when an energy storage element of the SIMO power converter is in a freewheeling state. The lowering can occur at a rate that continues as long at the freewheeling state persists. The disclosed circuits and methods allow the peak-current threshold to converge on a level that facilitates the sufficient charging of the energy storage element to provide enough energy to the outputs but not excessive charging so as to increase ohmic loss associated with the freewheeling state.

Abstract: A current converter unit for a high-voltage direct-current (HVDC) transmission contains a first converter and a second converter. A first direct-current terminal of the first converter is connected to a first conductor terminal point for a first HVDC transmission conductor. A second direct-current terminal of the first converter is connected to a first direct-current terminal of the second converter such that a connection point is formed. A second direct-current terminal of the second converter is connected to a second conductor terminal point for a second HVDC transmission conductor. The connection point is connected to ground potential by a current-damping electric component, and the connection point is connected to the ground potential by a direct-current switch.

Abstract: A power conversion circuit includes a first switch branch, a second switch branch, a third switch branch, a filter branch, and a first capacitor. A first terminal of the first capacitor is connected to a power source through the first switch branch, and a second terminal of the first capacitor is grounded through the second switch branch. The filter branch includes a filter inductor and a filter capacitor. A first terminal of the filter inductor is connected to the first terminal of the first capacitor, and a second terminal of the filter inductor is connected to a first terminal of the filter capacitor. A second terminal of the filter capacitor is grounded, and the filter capacitor is connected in parallel with the load. The third switch branch is connected between the second terminal of the first capacitor and the second terminal of the filter inductor.

Abstract: One or more embodiments relate to a current limit mode control circuit for a buck-boost converter which can provide a stable switching of the converter by operating the converter in a current limit mode during an overcurrent condition, performing fewer state transitions while in the current limit mode, and/or by clamping (reducing to a lower value) the output of an error amplifier in the current limit mode for controlling a pulse width modulation (PWM) signal that drives the switching transistors.

Abstract: An inductor current detecting circuit is provided. A current supplying circuit supplies a first current signal to an energy storage circuit having a zero voltage during a high-side conduction time, and a second current signal to the energy storage circuit having the zero voltage during a low-side conduction time. A voltage comparator circuit subtracts a valley voltage of a low-side switch from a peak voltage of a high-side switch to obtain a reference voltage, and outputs a comparison signal according to a voltage of the energy storage circuit and a reference voltage. A current modulation controller circuit modulates currents of the first and second current signals according to the comparison signal. A synthesizing circuit synthesizes the first and the second current signals, each of which charges the voltage of the energy storage circuit to be equal to the reference voltage from zero, to obtain an inductor current signal.

Abstract: An apparatus is provided, where the apparatus includes a first domain including first one or more circuitries, and a second domain including second one or more circuitries. The apparatus may further include a first voltage regulator (VR) to supply power to the first domain from a power bus, a second VR to supply power to the second domain from the power bus, and a third VR coupled between the first and second domains. The third VR may at least one of: transmit power to at least one of the first or second domains, or receive power from at least one of the first or second domains.

Abstract: A method and apparatus for operating a DC-DC converter in an interleaved (or rotating) pulse frequency modulation (PFM) mode is disclosed. A DC-DC converter includes a number of inductor pairs, with each inductor coupled to a corresponding pulse control circuit. During a cycle in which one of the pulse control circuits sources a current pulse through its respectively coupled inductor, a second pulse control circuit coupled to the other inductor of the pair determines if a voltage on its output node (e.g., where it is coupled to its inductor) is less than a threshold voltage. Responsive to determining that the voltage on its output node is less than the threshold, the second pulse control circuit activates a current path through the other inductor of the pair.

Abstract: A fault protection method used in a multiphase switching converter which includes a plurality of switching circuits coupled in parallel and a plurality of control circuits configured in a daisy chain. Each control circuit has a first terminal coupled to a phase control signal, a second terminal coupled to a previous control circuit in the daisy chain to receive a phase input signal, and a third terminal coupled to a latter control circuit in the daisy chain to provide a phase output signal.

Abstract: A short-circuit determination device is provided in a switching power supply device. The switching power supply device converts a power supply voltage applied between an upper power supply line and a lower power supply line and outputs the power supply voltage to a load through an intermediate node. The switching power supply device includes a plurality of upper switching elements and a lower switching element. Each of the plurality of upper switching elements has an electrical conduction terminal and a control terminal. The electrical conduction terminals are connected in series between the upper power supply line and the intermediate node. The control terminals are driven at a same level as each other. The lower switching element has an electrical conduction terminal connected between the lower power supply line and the intermediate node. The lower switching element and the plurality of upper switching elements are connected in series.