A voltage compensation circuit in a wireless communication device that performs wireless communication under a time division duplex (TDD) scheme includes a first path on which a diode is placed, a second path on which another diode is placed, and a timing controller. The first path is a path that supplies, to a transmitter-receiver, power output from a power supply and having a first voltage. The second path is a path that supplies power having a second voltage obtained by boosting the first voltage of the power output from the power supply. The timing controller switches between the first path and the second path based on information on timing of switch from signal reception to signal transmission.

A method and apparatus for providing welding type power includes a phase shifted double forward converter having a first and second converter with a controller and an output rectifier. The output rectifier has at least one cathode current path that creates a cathode magnetic field when current flows in the cathode current path. The output rectifier also has at least one anode current path that creates an anode magnetic field when current flows in the anode current path. The cathode current path is disposed and oriented and the anode current path is disposed and oriented such that the cathode magnetic field acts to at least partially cancel the anode magnetic field.

A power control system is electrically connected to a power function circuit including a power circuit, a coil module, a switch, and a load circuit, and includes at least one timer, a zero-current trigger unit, a status control unit, and a driver unit. The status control unit has a first status interval, a second status interval, a third status interval and a fourth status. The power control method triggers the status control unit to change the status interval when a counting time reaches one specific time interval corresponding one status interval. When a coil voltage of the coil module drops to zero from a voltage larger than a positive threshold voltage in the third status interval or the fourth status interval, the status control unit triggers to change the status interval, re-enters the first status interval, resets the timer, and triggers the driver unit to open the switch.

A power converter comprises a switch network coupled to an input voltage, a power transformer having a primary winding and a secondary winding, wherein the primary winding is coupled to the switch network, and the secondary winding is coupled to a rectifier, wherein the rectifier is coupled to an output voltage, a primary resonant tank having a first resonant capacitor and a first resonant frequency, and coupled to the primary winding of the power transformer and the switch network, and a regulation circuit configured to control the output voltage of the power converter to be substantially proportional to the input voltage and the switch network to operate at a frequency substantially close to the first resonant frequency.

A driver port that provides selectable output currents based on connections thereto, and a driver including the same, is provided. A plurality of shunt resistors are connected in series between a negative output of a driver and a ground. A driver port having a plurality of connection points is provided, each respective connection point connected to a different connection between two of the plurality of shunt resistors. A load including one or more solid state light sources is capable of being connected between one of the connection points of the driver port and a positive output of the driver.

A power supply apparatus comprises: a transformer that includes primary/secondary windings that are electromagnetically connected to each other with polarities opposite to each other, an output switch that activates/inactivates an electric-current route that extends from an application terminal for an input voltage to a ground terminal via the primary winding a rectifying-smoothing portion that generates an output voltage from an induced voltage, a feedback voltage generation portion that monitors a switch voltage appearing at a connection node between the primary winding and the output switch and generates a feedback voltage in accordance with the output voltage, a reference voltage generation portion that generates a reference voltage, a comparator that compares the feedback voltage and the reference voltage with each other to generate a comparison signal, and a switching control portion that generates an output switch control signal by means of an on-time control method in accordance with the comparison signal.

An oscillator applied to a control circuit of a power converter includes a compensation module and an oscillation module. The compensation module outputs or sinks an adjustment current according to a compensation voltage corresponding to a load, a direct current voltage of a primary side of the power converter, and a reference voltage. The oscillation module outputs a clock signal according to the compensation voltage, a control voltage, and the adjustment current. The control circuit generates a gate control signal to a power switch of the primary side according to the clock signal. When the compensation voltage is less than a first predetermined voltage, a frequency of the gate control signal is a first fixed value, and when the compensation voltage is between the first predetermined voltage and a second predetermined voltage and greater than the second predetermined voltage, the frequency is varied with the compensation voltage.

A transformer assembly includes a top core, a bottom core under the top core, a primary winding that is multi-layered and that extends around each of the top core and the bottom core, and a secondary winding that is multi-layered and that extends around each of the top core and the bottom core. The primary winding extends around the top core and the bottom core such that, when current flows in the primary winding, magnetic flux is canceled or substantially canceled in a region between the top core and the bottom core. A converter assembly includes the transformer assembly, a primary-side circuit including the primary windings, and a secondary-side circuit including the secondary windings.

The present disclose provides a magnetic assembly and a power module. In one aspect, the magnetic assembly includes a magnetic core having a first magnetic leg and a second magnetic leg spatially separated from the first magnetic leg to define a spatial channel therebetween, and a winding assembly comprising a first winding, a second winding, and a third winding. The first and second windings are wound around the first magnetic leg with at least a part of the first and second windings being accommodated within the spatial channel. The third winding is wound around the first and second magnetic legs. The first winding is disposed between the first magnetic leg and the second winding. The second winding is disposed between the first winding and the third winding.