Abstract: An apparatus includes an isolated power converter having an input connected to an input dc power source, a first output and a second output, and a non-isolated power converter having an input connected to the second output of the isolated power converter, wherein the first output of the isolated power converter and an output of the non-isolated power converter are connected in series.

Abstract: A bidirectional power conversion system includes three power conversion ports. A first power conversion port includes a power factor correction device and a primary power conversion network. A second power conversion port includes a plurality of switches and a plurality of diodes, wherein an output voltage of the second power conversion port is regulated through adjusting an output voltage of the power factor correction device as well as through adjusting an operating parameter of the primary power conversion network. A third power conversion port includes a first switch network and a power regulator connected in cascade, wherein the first power conversion port, the second power conversion port and the third power conversion port are magnetically coupled to each other through a transformer.

Abstract: A system includes a plurality of power modules connected in series between two input terminals of an inverter, a plurality of local controllers coupled to their respective power modules, wherein a first local controller of the plurality of local controllers is coupled to a first power module comprising a first solar panel, a first capacitor and a first power optimizer, and wherein the first local controller is configured to enable the first power optimizer to switch among a buck mode, a boost mode and a pass-through mode based upon a maximum power point tracking (MPPT) current of the first solar panel, and a central controller coupled to the inverter, wherein the central controller is configured to regulate an input voltage of the inverter.

Abstract: A hybrid DC-DC converter includes a converter circuit, a bridge circuit with a bridge path that includes a winding of a transformer, and another bridge circuit with a bridge path that includes another winding of the transformer. Current through the bridge path of the other bridge circuit flows through the converter circuit in one direction and bypasses the converter circuit in the other direction. The converter circuit can operate in buck, boost, or buck-boost mode.

Abstract: A system includes a current-mode switcher configured to provide a direct current (DC) voltage for a noise sensitive load, and a linear amplifier connected to an output of the current-mode switcher, the linear amplifier configured to draw a reduced supply voltage through at least one power conversion device that is coupled between a power source and the linear amplifier.

Abstract: An on-board charging apparatus is provided to implement high-power charging. The on-board charging apparatus includes an alternating current (AC) to direct current (DC) conversion circuit (AC/DC conversion circuit), a power factor correction (PFC) circuit, and a DC/DC conversion circuit. An alternating current terminal of the AC/DC conversion circuit is connected to an alternating current terminal of the PFC circuit. The AC/DC conversion circuit is configured to: receive a first alternating current voltage at the alternating current terminal of the AC/DC conversion circuit, and convert a first component of the first alternating current voltage into a first direct current voltage. The PFC circuit is configured to: convert a second component of the first alternating current voltage into a second direct current voltage. The DC/DC conversion circuit is configured to: convert the first direct current voltage and the second direct current voltage into a third direct current voltage.

Abstract: A multi-level converter includes a first blocking device, a second blocking device, a first switching element and a second switching element connected in series between an output terminal of the multi-level converter and ground, a first soft switching apparatus comprising a first auxiliary switch and a first transformer, wherein the first auxiliary switch and the first transformer are configured the first switching element is of zero voltage switching, and the first auxiliary switch is of zero current switching, and a second soft switching apparatus comprising a second auxiliary switch and a second transformer, wherein the second auxiliary switch and the second transformer are configured the second switching element is of zero voltage switching, and the second auxiliary switch is of zero current switching.

Abstract: An LLC resonant converter including a transformer, a switching full-bridge circuit, a resonant circuit, and a bridge rectifier. The switching full-bridge circuit has a first pair of switches and a second pair of switches, with the first pair of switches being connected between a DC input voltage and a second end of a secondary winding of the transformer, the second pair of switches being connected between a DC input voltage and a first end of the secondary winding of the transformer.

Abstract: A method comprises configuring a power converter to operate as a boost converter, the power converter comprising a low side switch and a high side switch, during a first dead time after turning off the low side switch and before turning on the high side switch, configuring the power converter such that a current of the power converter flows through a high speed diode, and after turning on the high side switch, configuring the power converter such that the current of the power converter flows through a low forward voltage drop diode.

Abstract: A device includes a first switch and a first diode connected in parallel between a midpoint and a first terminal of the hybrid power device, a second switch and a second diode connected in parallel between the midpoint and a second terminal of the hybrid power device, a third switch coupled between the first terminal and the second terminal, and a third diode connected between the first terminal and the second terminal.

Abstract: An LLC resonant converter including a transformer, a switching full-bridge circuit, a resonant circuit, and a bridge rectifier. The switching full-bridge circuit has a first pair of switches and a second pair of switches, with the first pair of switches being connected between a DC input voltage and a second end of a secondary winding of the transformer, the second pair of switches being connected between a DC input voltage and a first end of the secondary winding of the transformer.

Abstract: An LLC resonant converter includes a transformer, a switching half-bridge circuit, a resonant circuit, and a full-bridge rectifier. Both the switching half-bridge circuit and the full-bridge rectifier are on the same side of the transformer. The switching half-bridge circuit has a pair of switches, with one of the switches being connected to the output voltage node of the converter.

Abstract: A system comprises a first inverter and a second inverter connected in parallel, a coupled inductor connected to outputs of the first inverter and the second inverter, wherein the coupled inductor comprises a plurality of windings formed by a single winding wire and an output filter coupled to an output of the coupled inductor.

Abstract: System, device and method for exporting power are provided including at least one AC optimizer with plurality of DC inputs each connecting with respective one of plurality of DC sources, and independent maximum power point tracking (MPPT) performed for each respective DC source to extract power from each DC source for output and coupling to AC grid. When multiple AC optimizers are employed, with each AC optimizer having multiple DC inputs, each DC input can be connected to PV module with independent MPPT function. Since, each AC optimizer can serve multiple PV modules, significant cost saving and efficiencies can be achieved. Optionally, on PV sub-module level, each of the multiple DC inputs can be used as an independent MPPT channel for a PV sub-module cell string.

Abstract: A direct current (DC) bus voltage from a combined output of a plurality of DC power modules is controlled based on an alternating current (AC) voltage of a power grid. The DC bus voltage tracks the AC grid voltage to provide efficient conversion between the DC power sources and the AC grid, even when the amplitude of the AC grid voltage varies. In one example, a variable reference voltage is generated based on a detected AC grid voltage. The reference voltage increases and decreases in proportion to increases and decreases in the AC grid voltage. In this manner, large differences between the bus voltage and the grid voltage are avoided. By closely tracking the two voltages, efficiency in the modulation index for power conversion can be achieved.

Abstract: An inverter includes an upper unit comprises a first switch, a second switch and a third switch, wherein during a first half of a cycle of the inverter, the second switch is turned on before and turned off after the third switch, a lower unit comprising a fourth switch, a fifth switch and a sixth switch, wherein during a second half of the cycle of the inverter, the fifth switch is turned on before and turned off after the sixth switch, a flying capacitor connected between the upper unit and the lower unit, and a filter connected to a common node of the upper unit and the lower unit.

Abstract: A trans-inductor voltage regulator (TLVR) circuit has multiple phases and a regulator block for each phase. Each regulator block has a winding of a transformer as an output inductor. The other windings of the transformers are connected in series with a nonlinear compensation inductor. The compensation inductor has a large inductance when the compensation inductor current is responsive to a steady state load current and has a small inductance when the compensation inductor current is responsive to a transient load current.

Abstract: A multi-level converter includes a first blocking device, a second blocking device, a first switching element and a second switching element connected in series between an output terminal of the multi-level converter and ground, a first soft switching apparatus comprising a first auxiliary switch and a first transformer, wherein the first auxiliary switch and the first transformer are configured the first switching element is of zero voltage switching, and the first auxiliary switch is of zero current switching, and a second soft switching apparatus comprising a second auxiliary switch and a second transformer, wherein the second auxiliary switch and the second transformer are configured the second switching element is of zero voltage switching, and the second auxiliary switch is of zero current switching.

Abstract: A direct current (DC) bus voltage from a combined output of a plurality of DC power modules is controlled based on an alternating current (AC) voltage of a power grid. The DC bus voltage tracks the AC grid voltage to provide efficient conversion between the DC power sources and the AC grid, even when the amplitude of the AC grid voltage varies. In one example, a variable reference voltage is generated based on a detected AC grid voltage. The reference voltage increases and decreases in proportion to increases and decreases in the AC grid voltage. In this manner, large differences between the bus voltage and the grid voltage are avoided. By closely tracking the two voltages, efficiency in the modulation index for power conversion can be achieved.

Abstract: A hybrid DC-DC converter includes a converter circuit, a bridge circuit with a bridge path that includes a winding of a transformer, and another bridge circuit with a bridge path that includes another winding of the transformer. Current through the bridge path of the other bridge circuit flows through the converter circuit in one direction and bypasses the converter circuit in the other direction. The converter circuit can operate in buck, boost, or buck-boost mode.