Abstract: A method of DC-DC power conversion includes converting a DC link voltage to a DC output voltage for a load that is lower than the DC link voltage using a buck converter. The method includes controlling the buck converter in a normal switching mode in response to the DC link voltage being below a predetermined high threshold. The method also includes controlling the buck converter in a soft start switching mode in response to the DC link voltage being at or above the predetermined high threshold.

Abstract: A controller of a switching power supply can include: a frequency-jittering control circuit configured to generate a frequency-jittering signal adaptively; a comparator having two input terminals for respectively receiving an inductor current sampling signal and a feedback control signal, and being configured to compare the signals of the two input terminals to generate a switching control signal, in order to control a power transistor in the switching power supply; and a superimposing circuit configured to superimpose the frequency-jittering signal on one of the two input terminals of the comparator, where a switching frequency of the switching power supply varies within a preset range under different load conditions.

Abstract: A DC/AC inverter and microinverter architectures using the DC/AC inverter are disclosed. The DC/AC inverter is based on a differential geometry control scheme to balance and optimize the flying capacitor voltages across the flying capacitors used in the inverter's power circuit. Based on changing inverter and overall system conditions, including capacitor voltages, grid voltages, grid current, and DC bus voltages, desired fields are generated. These fields are used to balance capacitor voltages such that capacitor voltage values converge, over time, to an optimal solution.

Abstract: The present disclosure relates to an undervoltage protection circuit for a DC/DC converter of an electrified vehicle. The DC/DC converter generally operates in a first precharge stage, a second precharge stage and a buck mode. The undervoltage protection circuit comprises a threshold value switching unit which is connected with a controller and configured for receiving a control signal from the controller and switching among at least two predetermined undervoltage protection threshold values based on the control signal as received. The undervoltage protection circuit also comprises an undervoltage protection unit configured for outputting a signal indicating whether to activate an undervoltage protection based on a comparison between the switched undervoltage protection threshold value and a sampled voltage value from a high voltage side of the DC/DC converter.

Abstract: Circuits and methods for sensing output current of a power converter, controlling output current in multiple parallel power converters, and enabling reconfigurability of output control for multiple parallel power converters. One embodiment includes a current sensing circuit configured to be coupled to a power converter, the current sensing circuit configured to receive a first voltage representative of an output current of the power converter and output a low-frequency filtered second voltage based on the first voltage and a high-frequency filtered third voltage based on the first voltage. In some embodiments, the first voltage is generated by sensing an output current of the power converter and converting the sensed output current to the first voltage. Other embodiments include a plurality of power stages and corresponding current sensing circuits, wherein the outputs of the low-frequency filters of the current sensing circuits are coupled in common.

Abstract: A T-type buck-boost power factor correction (PFC) rectifier (TBPR) comprises a power inductor, first and second storage capacitors, and first, second and third bi-directional switches. The first bidirectional switch connects a power supply input to a first end of the power inductor, the second bidirectional switch connects the first end of the power inductor to a first end of the first capacitor and the third bidirectional switch connects the first end of the power inductor to a first end of the second capacitor. At the same time, the second end of the first capacitor, the second end of the second capacitor and the second end of the power inductor are connected to a common node.

Abstract: A detection circuit including a converter configured to convert a multiphase alternating current (AC) input into a direct current (DC) output, a plurality of sensing diodes, each sensing diode being separately electrically connected to one phase of the multiphase AC input, at least one node arranged downstream from the plurality of sensing diodes relative to the multiphase AC input, a power source configured to output a power source voltage to the at least one node and plurality of sensing diodes, and a mask time generator configured to determine a node voltage at the at least one node and determine whether the node voltage persists for a predetermined mask time period.

Abstract: A power converter for providing power to a load includes a buck converter having a DC input and a DC output and that is configured to receive a DC voltage at the DC voltage input and provide DC output voltage at the DC output. The converter also includes a voltage monitor that monitors a voltage provided at the DC output and a selectively connectable transient suppression circuit connected across that DC output and connected to the voltage monitor. The selectively connectable transient suppression circuit includes a dissipation circuit and a suppression circuit switch connected in series with the dissipation circuit that controls charge dissipation from the DC output into the dissipation circuit based on the voltage monitor determining that the voltage across the DC output is above a threshold.

Abstract: The disclosure provides a full-bridge resonant converter, including a full-bridge switching circuit, a transformer, a resonance tank, a secondary side circuit, and a damping circuit. The secondary side circuit includes a first output diode and a second output diode. When the current value of a current flowing through the first output diode and the second output diode is resonated to zero amperes, and a resonant current flowing through the resonance tank does not flow through a primary side winding of the transformer at all, the transformer and the secondary side circuit jointly provide an equivalent capacitance, and the damping circuit and the equivalent capacitance jointly perform a damping operation on the resonant current.

Abstract: A power converter includes a high side switch, a low side switch, a low side driver, a loading detector, a configurable regulator and a high side driver. The low side driver generates a low side drive signal to control the low side switch. The configurable regulator generates a regulation voltage, a magnitude of which is greater when the loading detector detects that the power converter has light loading than when the loading detector detects that the power converter has heavy loading. The high side driver generates a high side drive signal that switches between the input voltage and the regulation voltage to control the high side switch.

Abstract: An apparatus for conversion between AC and DC voltages includes a rectifier and first and second stages coupled to each other and having a regulator and a switched-capacitor circuit respectively. The first stage receives a first voltage from the rectifier and the second stage provides a second voltage. A controller controls the first and second stages.

Abstract: A power supply circuit has a first node, a second node, a DC-DC converter that includes a switched capacitor, generates an output voltage based on an input voltage supplied from the first node, and outputs the output voltage from the second node, and a regulator that is connected in parallel to the DC-DC converter between the first node and the second node and controls an output current flowing to the second node based on a reference voltage lower than the input voltage.

Abstract: An AC-DC conversion circuit provides a three-phase power source. The AC-DC conversion circuit includes a first inductor, a second inductor, a third inductor, a switch bridge arm assembly, and a control unit. The switch bridge arm assembly includes three switch bridge arms, and each switch bridge arm includes an upper switch and a lower switch. A plurality of common-connected nodes between the upper switches and the lower switches are coupled to the three-phase power source through the first inductor, the second inductor, and the third inductor. The control unit turns on the upper switch and the lower switch to provide a current detection loop. The control unit acquires a magnitude of a first current flowing through the first inductor and a magnitude of a third current flowing through the third inductor, and determines whether a current detection mechanism of the first current and the third current is normal.

Abstract: A method includes detecting a voltage signal of a three-level power converter, the voltage signal indicative of a capacitor voltage balancing in the three-level power converter, and dynamically adjusting an operating variable to adjust the voltage signal until the capacitor voltage balancing in the three-level power converter satisfies a criteria.

Abstract: An example apparatus includes: a first and second capacitor; a first and second inductor; a first switch having a first and second terminal, the first terminal coupled to the first capacitor, and the second terminal coupled to the first and second inductor; a second switch having a third and fourth terminal, the third terminal coupled to the second terminal, the fourth terminal coupled to the second capacitor; a third switch having a fifth and sixth terminal, the fifth terminal coupled to the first terminal, the sixth terminal coupled to the second inductor; and a diode having a seventh and eighth terminal, the seventh terminal coupled to the sixth terminal, the eighth terminal coupled to the fourth terminal.

Abstract: A method for hybrid control of grid-connected inverter based on time sharing of a voltage source and a current source including at least one control process, each control process including N+M control cycles. N may be a number of control cycles of a grid-connected inverter operating in a voltage source mode, M may be a number of control cycles of the grid-connected inverter operating in a current source mode. The control cycles of the grid-connected inverter operating in a voltage source mode and a current source mode may switch by counting. Aiming at a problem of being difficult to realize stable operation under large fluctuations in SCR, the present disclosure realizes a time-sharing control of the voltage source mode and the current source mode through a control algorithm, hybrids features of both mode, improves the stability of the grid-connected inverter, and realizes a stable operation under large fluctuations in SCR.

Abstract: A DCR current sensing circuit used in a switching converter having a power switch and an inductor. The DCR current sensing circuit has a current sensing capacitor coupled in series with a current sensing resistor to form a RC circuit, a current mirror, a first and a second compensation circuits, wherein the RC circuit is coupled in parallel with the inductor. The current mirror generates a first mirror current signal and a second mirror current signal based on a voltage across the current sensing capacitor. The first compensation circuit receives the first mirror current signal and generates a first current sensing signal for meeting a first requirement of the switching converter. The second compensation circuit receives the second mirror current signal and generates a second current sensing signal for meeting a second requirement of the switching converter.

Abstract: A triggered vacuum gap (TVG) device that has application as a closing switch for synchronized closing in distribution and transmission power systems. The TVG device controllably sustains a current arc in the device through initial current zeros created by power system transients and, thereby, prevents premature interruption of the closing operation. The TVG device includes main electrodes defining a vacuum gap therebetween and a triggering electrode providing a triggering gap between one main electrode and the triggering electrode. The TVG device also includes a triggering circuit having a high voltage impulse source that supplies a fast rising impulse voltage to the one main electrode and the triggering electrode for creation of a plasma to provide an initial breakdown of the triggering gap and a low voltage unidirectional current source that supplies current to the one main electrode and the triggering electrode once the first triggering gap breakdown has occurred.

Abstract: The present disclosure relates to a voltage converter and method for pulse frequency modulation-type operation during a start-up phase.

Abstract: A device may include an rectifier with one or more transistors that accepts a three-phas7 input and generates a DC bus output, a low-pass filter to provide a filtered DC bus voltage, a driver to drive the transistors based on a modulation index, and a controller to generate the modulation index. The controller may generate a nominal modulation index, generate an adjusted modulation index based on the nominal modulation index modified by a ratio of the filtered and measured DC bus voltages, and provide the modulation index to the PWM driver, where the modulation index is the nominal modulation index when a difference voltage associated with a difference between the filtered and measured DC bus voltages is below a voltage threshold, and where the modulation index is the adjusted modulation index when the difference voltage is above the voltage threshold.