A switch-mode power supply includes a pair of input terminals for receiving an alternating current (AC) or direct current (DC) voltage input from an input power source, a pair of output terminals for supplying a direct current (DC) voltage output to a load, and at least four switches coupled in a three-level LLC circuit arrangement between the pair of input terminals and the pair of output terminals. The power supply also includes a voltage doubler power factor correction (PFC) circuit coupled between the pair of input terminals and the three-level LLC circuit, and a control circuit coupled to operate the at least four switches to supply the DC voltage output to the load.

Embodiments relate to a system comprising: a first module. The first module comprises a power receiving module configured to receive an input power from an energy source. The system further comprises a second module. The second module comprises a power conversion module configured to convert the input power to an output power. The system further comprises a third module. The third module comprises a control module for configuring the first module or the second module to perform a charging operation or a discharging operation. The first module, the second module and the third module are functionally integrated in the system to perform multiple modes of the charging operation or the discharging operation. The third module controls an impedance of the input power and the output power in the second module.

A control circuit for a switching power supply, can include: a sampling circuit configured to obtain an inductor current and a drain-source voltage of a main power transistor in a power stage circuit, in order to generate a sampling signal; where the control circuit generates an inductor current sampling signal according to the sampling signal during an on-period of the main power transistor; and where during an off-period of the main power transistor, the control circuit generates a zero-crossing signal of the inductor current and an overvoltage signal of an output voltage of the switching power supply according to the sampling signal.

A power factor correction (PFC) circuit is provided. The PFC circuit includes an input for receiving alternating current and a converter for converting the received alternating current to a direct current. The PFC circuit also includes a direct current link that includes at least one capacitor. Additionally, the PFC circuit includes a voltage regulator control loop operating in burst mode under light load conditions by switching between an ON-state and an OFF-state periodically. The PFC circuit also includes a controller preloading the voltage regulator control loop with an initial value corresponding to the circuit current load under light conditions, when the voltage regulator control loop is transitioning to an ON-state of the burst mode. The initial value is based on the rate of change of the voltage at the direct current link and the capacitance of the capacitor of the direct current link.

A multiphase interleaved forward power converter includes an inductor and first and second subconverter comprising respective transformers. The converter also includes first and second drives configured to respectively operate the first and second subconverters with cycling periods comprising a conduction period, a reset period, and an idle period. The first and second drives are also configured to phase shift the cycling periods in each subconverter such that the conduction period of the subconverter is at least partially complementary to the idle period of the other subconverter. The second drive also clamps a voltage across a winding of the transformer of the first subconverter to substantially prevent a first resonance voltage from propagating in the first subconverter during the idle period of the first subconverter.

A controller for a power converter. The power converter comprises an inverter for receiving a supply power and providing an inverter output at an inverter frequency. There is a primary inductance for receiving the inverter output and providing a primary output. There is at least one current sensor for sensing at least one output current and providing at least one output current signal based on the at least one output current. The controller is adapted to receive the at least one output current signal, and control the inverter frequency by providing a switch control signal to the inverter based on the at least one output current signal and a reference signal thereby providing a desired primary output corresponding to the reference signal.

The subject invention reveals new methods and structures for achieving single stage power conversion with both regulated input current and regulated output voltage processing a minimum of load power and thereby achieving higher efficiency than other singles stage power converters with both regulated input current and regulated output voltage and two stage power factor corrected power converters. The subject invention reveals power factor corrected converters that improve the efficiency of the single stage power factor corrected converters on which they are based by adding an auxiliary converter that processes a small fraction of the total load power.

A power supply apparatus comprising a power input portion, a rectifying portion, a power conversion portion, a power output portion and an electrical filter is disclosed. The electrical filter is connected intermediate the rectifying portion and the power output portion for reduction of switching noise generated during power switching operations of the power switching circuitry. With such an arrangement, the electrical filter operates in the DC portion of the apparatus and power loss is significantly reduced while switching noise is suppressed nearer the source compared to conventional arrangement. In addition, switching noises due to stray or parasitic capacitance to the metal casing when the power supply is enclosed in a metallic casing to form a power supply module are also mitigated nearer the source.

The present disclosure discloses a power transforming apparatus capable of reducing a stress of a converter switch during a PFC operation, an operation method thereof, and an air conditioner including the same. To this end, the power transforming apparatus according to the present disclosure may determine the number of converters for performing a PFC operation based on a magnitude of input power and a speed of the motor. Furthermore, target converter channels are arbitrarily selected using a random function at an initial stage of a PFC operation so as not to add a stress to a switch device of any one converter. In addition, in order to disperse a stress to all switches, phases are individually controlled to perform switching operations while changing converters that match the number of converters for performing a PFC operation in a preset cycle, for example, whenever a zero-crossing is detected.

A control circuit includes an output terminal configured to be coupled to a control terminal of a transistor that has a current path coupled to an inductor; a transconductance amplifier configured to produce a sense current based on a current flowing through the current path of the transistor; and a first capacitor. The control circuit is configured to turn on the transistor based on a clock signal, integrate the sense current with an integrating capacitor to generate a first voltage, generate a second voltage across the first capacitor based on a first current, generate a second current based on the second voltage, generate a third voltage based on the second current, turn off the transistor when the first voltage becomes higher than the third voltage; discharge the integrating capacitor when the transistor turns off; and regulate an average output current flowing through the inductor based on the first current.