An NMOS switch driving circuit and a power supply device are provided. The NMOS switch driving circuit includes a power-supply unit, a switch unit, a power conversion unit, and a driving unit. The power-supply unit is configured to output a first voltage. The switch unit is electrically coupled between the power-supply unit and a first interface and configured to establish or disconnect an electrical coupling between the power-supply unit and the first interface. The power conversion unit includes a port coupled to the power-supply unit and another port electrically coupled to the switch unit via the driving unit. The power conversion unit is configured to convert the first voltage into a constant driving voltage and output the driving voltage to the switch unit via the driving unit to drive the switch unit to be switched on, to establish the electrical coupling between the power-supply unit and the first interface.

A secondary controller applied to a secondary side of a power converter includes a control signal generation circuit. The control signal generation circuit is coupled to an output terminal of the secondary side of the power converter for detecting an output voltage of the secondary side and enabling a pulse signal to a signal source of the secondary side of the power converter, wherein the signal source enables a turning-on signal according to the pulse signal. The turning-on signal is coupled to a primary-side auxiliary winding of the power converter through a secondary-side auxiliary winding of the power converter to make the primary-side auxiliary winding generate a voltage, and a primary controller of a primary side of the power converter makes the primary side of the power converter be turned on according to the voltage.

An electrical-power-supplying device for a wall plug includes a first DC-DC power converter including a first output and a second output; a second DC-DC power converter the input of which is connected to the second output; and a first capacitor connected to the input of the first converter, a second capacitor connected to the first output and a third capacitor connected to the second output. The first output of the first converter and the output of the second converter are connected in series to form an output of the power-supplying device able to deliver a DC voltage, the power-supplying device including at least one fourth capacitor that is connected to the output of the second converter or to the output of the power-supplying device.

According to the present embodiment, a DC transformation system includes a rectifier, a first power conversion device, a second power conversion device, and a control device. The rectifier rectifies AC power supplied from an AC power source and outputs a first DC voltage. The first power conversion device is connected in series to the rectifier and outputs a second DC voltage. The second power conversion device is connected in parallel to the rectifier and converts power supplied from the rectifier to supply the converted power to the first power conversion device. The control device controls the first power conversion device to cause an addition/subtraction voltage of the first DC voltage and the second DC voltage to be a predetermined voltage.

A system for preventing magnetic saturation and for controlling and managing DC offset in a transformer cores. A magnetic flux sensor is disposed within a bore within the core transformer core. The sensor transmits a sensor output that is continuously received by a processor that is programed to continuously compare in real time the sensor output with a stored selectable maximum flux sensor output value. Responsive to the comparison of real-time sensor output value to the stored maximum value, the microprocessor either allows, during each driving voltage half-cycle, the driving voltage to continue unabated while the sensor output remains below the selectable maximum value, or triggers a gate to modify the driving voltage for the remainder of the half-cycle when the selectable maximum value is reached. The processor is also programed to process, in parallel or separately, the flux sensor output for each phase half-cycle to continuously compute a flux-second integral for each half-cycle, and to continuously compare them to each other for an instantaneous DC offset value and to add a DC voltage to the phase half-cycle that is deficient and or to subtract a DC voltage from the phase half-cycle that is contributing to the DC offset to effect minimal DC offset.

The invention discloses a novel control scheme/strategy for the stacked structure LLC resonant converter. The control scheme includes a control signal as a gating signal of the fourth switch, and gating signals of the first, second and third switches that are operably generated according to the gating signal of the fourth switch. The gating signals of the second switch has a same duty ratio as and a phase shift of 180 degrees from the gating signal of the fourth switch. The gate signals of the first and third switches are complementary with the gate signals of the second and fourth switches, respectively. By adopting the control strategy, a three level LLC resonant network input voltage is generated, which includes Vin, Vin/2 and 0.

A two-stage step-down converter includes a first stage and a second stage operatively connected to the first stage. The first stage is to step down an input voltage to an intermediate periodic signal and includes a primary side, a secondary side, and a plurality of transformers to electromagnetically couple the primary side and the secondary side to step down the input voltage to the intermediate periodic signal. The primary windings of the transformers are connected in series and the secondary windings are connected in parallel.

A wind park for feeding power into a supply network at a connection point is provided. The wind park includes wind turbines for generating the power, a DC network for transmitting the power to the connection point, an inverter configured to transform electrical DC voltage into an AC voltage for feeding the power into the supply network, at least one DC-DC converter for feeding the power into the DC network. The DC-DC converter includes a switching device and a transformer with primary and secondary sides. The primary side is coupled to the at least one wind turbine via the switching device and the secondary side is coupled to the DC park network via at least one rectifier. The DC-DC converter is configured to apply a DC voltage of changing polarity to the primary side by the switching device to transform a DC voltage of the at least one wind turbine.

A power converter including: a dual output resonant converter including a first output, a second output, a common mode control input, and a differential mode control input, wherein a voltage/current at the first output and a voltage/current at the second output are controlled in response to a common mode control signal received at the common mode control input and a differential mode control signal received at the differential mode control input; a dual output controller including a first error signal input, a second error signal input, a common mode control output, and a differential mode control output, wherein the dual output controller is configured to generate the common mode control signal and the differential mode control signal in response to a first error signal received at the first error signal input and a second error signal received at the second error signal input, wherein the first error signal is a function of the voltage/current at the first output and the second error signal is a function of the voltage/current at the second output, and wherein the common mode control signal is output from the common mode control output and the differential mode control signal is output from the differential mode control output; and a common mode signal offset circuit configured to generate a common mode signal offset signal wherein the common mode signal offset signal adjusts a difference in output power between the first output and the second output of the dual output resonant converter.

First, it is assumed that a low-side switching element is turned off. At this time a resonance current before-inversion time is counted. When a resonance current is inverted, a count value is held and the counting operation of a resonance current after-inversion time is begun. Next, a target value of the resonance current after-inversion time at which a high-side switching element is to be turned off is calculated based on a feedback signal and the counting operation of the resonance current after-inversion time is continued. When a count value reaches the target value, the counting operation of the resonance current after-inversion time is ended and the high-side switching element is turned off. After a high-side half cycle is controlled, a low-side half cycle is controlled in the same way. Responsiveness to a sudden change in load is improved by exercising control every half cycle.