Abstract: A power supply includes a first DC-DC converter coupled to receive power from a first power source, a second DC-DC converter coupled to receive power from a second power source, and a control block. The first DC-DC converter is operable to generate a regulated power supply voltage on an output node of the power supply. The first power source has a maximum output current limit. The second DC-DC converter is also operable to generate a regulated power supply voltage on the output node. The control block is designed to generate the regulated power supply voltage based on both of the first DC-DC converter and the second DC-DC converter.

Abstract: A current sensing circuit includes an inductor current sensing circuit and a processing circuit. The inductor current sensing circuit senses an inductor current of a direct current to direct current (DC-to-DC) converter to generate a first sensed current signal, wherein an average value of the first sensed current signal is not a constant under different input voltages of the DC-to-DC converter. The processing circuit generates a second sensed current signal, wherein the first sensed current signal is involved in generation of the second sensed current signal, the second sensed current signal is involved in current-mode control of the DC-to-DC converter, and an average value of the second sensed current signal is a constant under said different input voltages of the DC-to-DC converter.

Abstract: A method and apparatus for adding and shedding phases in a multi-phase power converter is disclosed. A power converter includes a plurality of voltage regulators including a given voltage regulator configured to generate, when active, a particular output voltage on a regulated power supply node. The power converter further includes a control circuit. The control circuit is configured determine an amount of output current being supplied to the regulated power supply node by active ones of the plurality of voltage regulator circuits. The control circuit is further configured to adjust a number of voltage regulator circuits that are active based on the output current and one or more environmental parameters associated with the plurality of voltage regulator circuits.

Abstract: A boost converter includes an inductor and a diode electrically connected in series between an input voltage and an output voltage; a transistor electrically coupled to an interconnected node of the inductor and the diode; and a controller that controls switching of the transistor according to a transient mode and an estimated load current. The output voltage in a light-to-heavy load transient mode has at least one first valley point with a value of a transient voltage threshold, followed by at least one second valley point with a value higher than the first valley point, before exiting the light-to-heavy load transient mode.

Abstract: According to one embodiment, a power supply circuit includes a smoothing capacitor that is charged with a charge current from an output transistor and outputs a voltage as an output voltage; a control loop that controls a conduction state of the output transistor depending on a difference value between the output voltage and a reference voltage; and a gain adjustment circuit that adjusts a gain of the control loop depending on magnitude of the charge current after the charge starts.

Abstract: A direct current to direct current (DC-DC) converter can include a chip embedded integrated circuit (IC), one or more switches, and an inductor. The IC can be embedded in a PCB. The IC can include driver, switches, and PWM controller. The IC and/or switches can include eGaN. The inductor can be stacked above the IC and/or switches, reducing an overall footprint. One or more capacitors can also be stacked above the IC and/or switches. Vias can couple the inductor and/or capacitors to the IC (e.g., to the switches). The DC-DC converter can offer better transient performance, have lower ripples, or use fewer capacitors. Parasitic effects that prevent efficient, higher switching speeds are reduced. The inductor size and overall footprint can be reduced. Multiple inductor arrangements can improve performance. Various feedback systems can be used, such as a ripple generator in a constant on or off time modulation circuit.

Abstract: The power supply apparatus alternately repeats a control between a first control of varying a frequency of switching operation within a predetermined range and for a predetermined cycle according to a frequency determined based on a feedback voltage, and a second control of varying the frequency within a range narrower than the predetermined range or a third control of controlling the frequency to be a constant frequency.

Abstract: A method for controlling a power conversion device for converting power from a power supply by controlling an input to a resonance circuit comprising a resonance coil and a resonance capacitor, with a switching element, the method comprising simultaneously changing a switching frequency and a time ratio of the switching element so that the switching element satisfies a condition of zero-voltage switching when an output power of the power conversion device is changed.

Abstract: GaN-based half bridge power conversion circuits employ control, support and logic functions that are monolithically integrated on the same devices as the power transistors. In some embodiments a low side GaN device communicates through one or more level shift circuits with a high side GaN device. Various embodiments of level shift circuits and their inventive aspects are disclosed.

Abstract: A flyback power converter circuit includes a transformer, a blocking switch, a primary side switch, a primary side controller circuit and a secondary side controller circuit. The transformer is coupled between an input voltage and an internal output voltage in an isolated manner. The blocking switch controls the electric connection between the internal output voltage and an external output voltage. In a standby mode, the internal output voltage is regulated to a standby voltage, and the blocking switch is controlled to be OFF; in an operation mode, the internal output voltage is regulated to an operating voltage, and the blocking switch is controlled to be ON, such that the external output voltage has the operating voltage. The standby voltage is smaller than the operating voltage, so that the power consumption of the flyback power converter circuit is reduced in the standby mode.

Abstract: Aspects of an efficient, wide voltage range, power converter system are described. In one example, a power converter system includes a first power converter, a second power converter, and a controller for the power converter. An input of the first power converter and an input of the second power converter are connected in series across an input voltage for the power converter system, and an output of the first power converter and an output of the second power converter are connected in parallel at an output of the power converter system. The controller is configured to regulate the second power converter and to determine whether or not to regulate the first power converter based on the input voltage for the power converter system and an output voltage of the power converter system, among other factors, for greater efficiency of the power converter system over wider input and output voltage ranges.

Abstract: The present document relates to a power converter configured to generate an output voltage at an output of the power converter. The power converter may comprise a power stage, a modulator circuit, ramp generator circuit, a first feedback circuit, and a second feedback circuit. The power stage may be coupled to the output of the power converter. The modulator circuit may comprise a first input and a second input, and an output of the modulator circuit may be coupled to the power stage. The ramp generator circuit may be configured to generate a ramp signal, and an output of the ramp generator circuit may be coupled to the first input of the modulator circuit. The first feedback loop may be coupled between the output of the power converter and the second input of the modulator circuit.

Abstract: An electronic device includes a switched-mode power supply having a first operating phase during which the output node of the switched-mode power supply is coupled by an on switch to a source of a first reference voltage. The first operating phase is followed by a second operation phase during which the output node of the switched-mode power supply is in a high impedance state. While in the second operating phase, a capacitor connected to the output node of the switched-mode power supply at least partially discharges into a load.

Abstract: A synchronous rectifier controller for controlling a rectifier switch is disclosed. The synchronous rectifier controller includes a fully-ON controller and a regulator. Capable of being triggered by a channel voltage of the rectifier switch, the fully-ON controller turns the rectifier switch fully ON for a fully-ON time in view of a predetermined condition. The regulator, disabled during the fully-ON time and enabled after the fully-ON time, turns the rectifier switch ON to regulate the channel voltage within a predetermined voltage range.

Abstract: This disclosure includes novel ways of implementing a power supply that powers a load. More specifically, a power supply includes a controller. The controller controls operation of a first power converter stage and a second power converter stage to convert an input voltage into an output voltage. For example, the first power converter stage is operative to receive an input voltage and convert the input voltage into an intermediate voltage. The second power converter stage such as a transformer-less switched-capacitor converter is coupled to the first power converter stage. The second power converter stage receives the intermediate voltage and converts the intermediate voltage into an output voltage to power a load.

Abstract: A power converter can include a magnetic energy storage element, a main switch, a synchronous rectifier switch, and an energy recovery circuit. The energy recovery circuit can include a resonant circuit and an auxiliary switch configured to operate in conjunction with the main and synchronous rectifier switches to store energy in the resonant circuit and deliver energy therefrom to reduce switching losses associated with the main and synchronous rectifier switches. The converter can be a buck, boost, buck-boost, or other converter type. The auxiliary switch may be operated according to a two-pulse control mode or using a conventional buck converter controller with additional delay elements. The resonant circuit inductance may be a discrete inductor or a parasitic inductance, such as a PCB trace, which may be designed to provide a desired inductance value selected to efficiently provide sufficient energy to achieve reduced switching losses of the main and auxiliary switches.

Abstract: An apparatus includes a pulse-width modulation (PWM) generator configured to generate a PWM signal for controlling a power switch of a power converter, a bias switch and a bias capacitor connected in series and coupled to a magnetic winding of the power converter and a comparator having a first input connected to the bias capacitor, a second input connected to a predetermined reference and an output configured to generate a signal for controlling the bias switch to allow a magnetizing current from the magnetic winding to charge the bias capacitor when a voltage across the bias capacitor is less than the predetermined reference.

Abstract: A method for controlling a current associated with a power converter may comprise controlling the current based on at least a peak current threshold level for the current and a valley current threshold level for the current, and further controlling the current based on a duration of time that the power converter spends in a switching state of the power converter.

Abstract: The invention discloses a flyback switching power supply, including a power input and rectifying circuit; a DC-DC switching circuit, the DC-DC switching circuit comprising a PWM control integrated circuit; and a voltage and current feedback circuit. The PWM control integrated circuit comprises a chip working frequency setting pin for setting a working frequency of the PWM control integrated circuit, the flyback switching power supply further comprises a frequency adjustment circuit connected between the chip working frequency setting pin of the PWM control integrated circuit and the voltage and current feedback circuit, and the frequency adjustment circuit is configured to decrease the working frequency when the flyback switching power supply is under a low load condition, and increase the working frequency when the flyback switching power supply is under a high load condition.

Abstract: A non-isolating AC-DC voltage converting system has two voltage converters. The first voltage converter receives a bus voltage and turns on a power transistor when the bus voltage is at valley regions and to provide an interim voltage which is lower than the bus voltage. The second voltage converter receives the interim voltage and provides an output voltage of the AC-DC voltage converting system.