An improved method of providing high burst power to audio amplifiers from limited power sources, using parallel power paths to increase system efficiency without need for a power path controller, thus utilizing a simplified circuit operation and maximizing average power available for both the amplifier and supporting circuitry.

A power supply used to convert an input voltage into an output voltage, and the power supply includes an input detection circuit, a conversion circuit, a detection circuit, and a controller. The input detection circuit provides a power good signal or a power fail signal according to the input voltage. The conversion circuit converts the input voltage into an output voltage, and the detection circuit detects the output voltage according to the power good signal to accordingly provide an output feedback signal with a first feedback value. The controller stabilizes a voltage level of the output voltage according to the first feedback value. The detection circuit self-adjusts a feedback condition according to the power fail signal, and correspondingly adjusts the output feedback signal to a second feedback value according to the feedback condition. The controller reduces the voltage level of the output voltage according to the second feedback value.

A method involves determining that a power converter is in a no-load or ultra-light load mode of operation. In response to determining that the power converter is in a no-load or ultra-light load mode of operation, a voltage amplitude of a feedback signal of the power converter is allowed to rise towards a voltage amplitude that is greater than or equal to a first threshold voltage level. Upon determining that the voltage amplitude of the feedback signal is greater than or equal to the first threshold voltage level, a first sequence of enabling pulses are issued to a primary side switch of the power converter to reduce a voltage amplitude of the feedback signal. Upon determining that the voltage amplitude of the feedback signal is greater than or equal to a second threshold voltage level, a normal mode of operation of the power converter is entered.

An integrated circuit for a power supply circuit that includes a transformer including a primary coil, a secondary coil, and an auxiliary coil, and a transistor controlling a current flowing through the primary coil. The integrated circuit includes a first determination circuit determining a state of the load; a second determination circuit determining whether a current of the secondary coil is in a continuous mode and a discontinuous mode, in which the current of the secondary coil respectively does not reach, and reaches, zero when the transistor is off; an oscillator circuit outputting an oscillator signal; and a switching control circuit controlling switching of the transistor in response to a determination result of the second determination circuit and the oscillator signal, and in response to the oscillator signal irrespective of the determination result of the second determination circuit, respectively when the state of the load is light and heavy.

Systems and methods for voltage compensation based on load conditions in power converters. For example, a system controller for regulating a power converter includes a first controller terminal; a second controller terminal; and a compensation current generator. The compensation current generator is configured to receive an input signal through the first controller terminal. The input signal indicates a first current flowing through a primary winding of a power converter. The compensation current generator is configured to receive a demagnetization signal related to a demagnetization period of the power converter and associated with an auxiliary winding of the power converter. The compensation current generator is configured to generate a compensation current based at least in part on the input signal and the demagnetization signal. The compensation current generator is connected to a resistor. The resistor is configured to generate a compensation voltage based at least in part on the compensation current.

A flyback converter with indirect estimation of primary-side voltage at the secondary-side. The converter includes a primary voltage sensing circuit coupled to the second winding of the converter and being configured to establish an output voltage when a switch of the converter is in the first state and a first diode of the converter is reversed biased, the output voltage being representative of a voltage across the primary winding.

A plasma deposition system comprising a wafer platform, a second electrode, a first electrode, a first high voltage pulser, and a second high voltage pulser. In some embodiments, the second electrode may be disposed proximate with the wafer platform. In some embodiments, the second electrode can include a disc shape with a central aperture; a central axis, an aperture diameter, and an outer diameter. In some embodiments, the first electrode may be disposed proximate with the wafer platform and within the central aperture of the second electrode. In some embodiments, the first electrode can include a disc shape, a central axis, and an outer diameter. In some embodiments, the first high voltage pulser can be electrically coupled with the first electrode. In some embodiments, the second high voltage pulser can be electrically coupled with the second electrode.

Embodiments include systems for regulating windings in a power supply. Aspects include a transformer comprising a first primary winding and a first secondary winding, a DC to DC converter, a saturable reactor coupled to an output of the first secondary winding and an input to the DC to DC converter, and a controlled current source coupled to a node between the saturable reactor and the input of the DC to DC converter, wherein the controlled current source is configured to provide a current rate based on an output voltage of the DC to DC converter, wherein a first filter inductor of the DC to DC converter is magnetically coupled to a second filter inductor of a second DC to DC converter.

This application discloses a converter and a power adapter, to reduce an energy loss of the power adapter. The converter includes a direct current power supply, a main power transistor, an auxiliary power transistor, a first capacitor, a transformer, and a control circuit. The first capacitor and the transformer are connected in series to form a series circuit. The series circuit is connected to a first terminal and a second terminal of the auxiliary power transistor in parallel. The control circuit is configured to: when the main power transistor is in a cutoff state and a target voltage reaches a target valley voltage, control the main power transistor to be conducted. The target voltage is a voltage between the first terminal of the main power transistor and the ground.

An integrated circuit (IC) assembly includes a first power stage adapted to receive an input voltage and a second power stage adapted to provide an isolated output voltage. The IC also includes a transformer coupled between the first and second power stages. The IC further includes a detuning circuit coupled to the transformer, and a receiver circuit coupled to the first power stage. The receiver circuit includes an integrator configured to integrate a switching signal within the first power stage.