Abstract: In accordance with embodiments of the present disclosure, a system may include an impedance estimator configured to estimate an impedance of a load and generate a target current based at least on an input voltage and the impedance, a voltage feedback loop responsive to a difference between the input voltage and an output voltage of the load, and a current controller configured to, responsive to the voltage feedback loop, the impedance estimator, and the input voltage, generate an output current to the load.

Abstract: A tri-level converter provides three levels of power supply to a power amplifier that includes a supply path. The supply path has a first transistor and a first inherent body diode associated with the first transistor, as well as a second transistor and a second inherent body diode associated with the second transistor. A polarity of the second body diode is reversed relative to a polarity of the first body diode. A first driver is configured to drive the first transistor and the first inherent body diode to control a power supply, including a battery supply signal, to an output of the tri-level converter. The tri-level converter is coupled to a switching node.

Abstract: Example power factor correction circuits to correct the power factor of power converters are disclosed. An example power factor correction controller circuit includes a phase locked loop phase angle determiner to determine a first phase angle of an input voltage of the power converter and further includes a compensating current determiner to determine, based on the phase angle, a compensating current to compensate for a capacitive current introduced by at least one filter capacitor of the power converter. The power factor correction controller circuit further includes a switch controller to cause a controlled current drawn by a power stage of the power converter to be adjusted by the compensating current to reduce a phase offset between the first phase angle of the input voltage and a second phase angle of the an input current drawn at an input of the power converter.

Abstract: An ESD protection circuit, which protects a subject NMOS transistor coupled between an I/O pad and a ground, includes a first discharge device arranged between the I/O pad and the ground, having a trigger-on voltage that is lower than a breakdown voltage of the subject NMOS transistor; and a gate voltage control device, including a discharge NMOS transistor coupled to the ground and a gate of the subject NMOS transistor; a first PMOS transistor connected to the gate of the subject NMOS transistor and a connection node; and a first NMOS transistor connected to the connection node and the ground. The connection node is connected to the gate of the discharge NMOS transistor, and the gate of the first PMOS transistor and the gate of the first NMOS transistor are connected to each other.

Abstract: A power conversion system includes a controller that generates switching control signals according to duty cycles for a current switching control cycle, and adjusts the duty cycles by a non-zero offset value according to a modulation index in response to the modulation index exceeding a non-zero threshold. A method includes computing first duty cycles according to a modulation index, generating a plurality of switching control signals according to the first duty cycles in response to the modulation index being less than or equal to a non-zero threshold, computing second duty cycles offset from the first duty cycles and generating the plurality of switching control signals according to the second duty cycles in response to the modulation index exceeding the non-zero threshold.

Abstract: An integrated circuit (IC) comprises a regulator circuit, a bootstrap control circuit, and a gate driver that drives a transistor pair in buck or boost mode to switch current through an inductor. The IC has a VIN terminal coupled to receive a voltage generated from an AC power source, a STR terminal coupled to receive a voltage from a stored power source (e.g., a capacitor bank), and a HSB terminal that is capacitively coupled to the inductor. When bucking or boosting, the regulator circuit generates VDD supply voltage from the stored power source, supplies the VDD supply voltage onto the bootstrap control circuit, and the bootstrap control circuit generates a gate driver supply voltage that is supplied to the gate driver circuit. When not bucking or boosting, voltage on the HSB terminal is maintained between a voltage threshold from the AC power source without draining the stored power source.

Abstract: Disclosed is a circuit for voltage regulation, the circuit including: an amplifier operable to generate an amplifier output signal according to a reference voltage and a negative feedback voltage; an adaptive pre-driver operable to generate a bias current according to the amplifier output signal or according to the amplifier output signal and a current-dependent signal that varies with the variation of an output current, in which the bias current varies with the variation of the output current; a driving circuit operable to generate an output voltage and the output current according to the amplifier output signal; and a negative feedback circuit operable to generate the negative feedback voltage according to the output voltage. Since the bias current varies with the variation of the output current, the output impedance of the adaptive pre-driver varies with the variation of the output current so that the stability of the circuit is improved.

Abstract: A power transfer system includes power conversion circuitry that has first circuitry and second circuitry on either side of a transformer that include a transformer having a power supply, a switch, a capacitor connected in parallel with a winding of the transformer, and an inductor connected between the power supply and the capacitor. The inductor provides an additional resonance current path through the power conversion circuitry that is configured to reduce a peak voltage at the switch. A direction of power transfer through the power conversion circuit is determined, and the first circuitry and the second circuitry are configured based on the determined direction of power transfer. The switches of the first circuitry and second circuitry are controlled using switching based on the determined direction of power transfer and a quantity of power transfer.

Abstract: A configurable power converter includes a chassis, a plurality of circuit terminals, power conversion hardware, and a controller. The chassis has an exterior and defines an interior cavity. The plurality of circuit terminals are coupled to the exterior of the chassis. The power conversion hardware is disposed within the interior cavity of the chassis and connected to the plurality of circuit terminals. The power conversion hardware includes at least one of a plurality of electrical switches, a plurality of capacitors, or a plurality of inductors.

Abstract: A secondary controller applied to a secondary side of a power converter includes a control signal generation circuit, a voltage detection signal generation circuit, and a gate control signal generation circuit. The control signal generation circuit generates a short-circuited control signal to a short winding switch after a gate control signal to make the short winding switch be turned on. When an output voltage of the power converter is less than a predetermined voltage, the voltage detection signal generation circuit generates a first detection signal to the control signal generation circuit. The control signal generation circuit further generates a gate pulse control signal according to the first detection signal. The gate control signal generation circuit generates a gate pulse signal according to the gate pulse control signal, wherein the gate pulse signal is used for making a primary side of the power converter be turned on.

Abstract: Implementations described and claimed herein provide systems and methods for supplying voltage to a load and battery. In one implementation, an unregulated DC-to-DC converter is electrically connected to a first energy source to down convert a first voltage supplied by the first energy source. A load is electrically connected to the unregulated DC-to-DC converter to receive the down converted first voltage. A regulated DC-to-DC converter is electrically connected to the unregulated DC-to-DC converter to regulate the down converted first voltage to a second voltage. A second power source is electrically connected to the regulated DC-to-DC converter to charge the second power source using the second voltage, and the second power source is switchably connectable to the load.

Abstract: An earth leakage circuit breaker includes a current sensing unit configured to sense current in a circuit, a converter configured to detect a fundamental wave component and a specific harmonic component from the sensed current, the specific harmonic component being one of a plurality of harmonic components, and a controller. The controller is configured to compare a harmonic component ratio with a threshold component ratio, to determine whether the sensed current is abnormal current, and to control cutoff of the circuit according to the result of determination. The harmonic component ratio is a ratio of the specific harmonic component to the fundamental wave component. The converter is configured to convert the sensed current from an analog signal into digital data and to perform Fourier transform with respect to the converted digital data to detect the fundamental wave component and the specific harmonic component.

Abstract: Methods and apparatus to increase efficiency of a power converter using a bias voltage on a low side drive gate are disclosed. An example power converter includes an inductor; a transistor coupled to the inductor; and a driver coupled to a gate of the transistor, the driver to apply (A) a first voltage to the gate to enable the transistor, (B) a second voltage to the gate to disable the transistor, and (C) a third voltage to the gate during a transition between applying the first voltage and the second voltage, the third voltage being between the first voltage and the second voltage.

Abstract: A system that provides intelligent constant on-time control may include a first switch coupled to a power input; a second switch coupled to the first switch; a switching node between the first switch and the second switch, the switching node configured to be connected to an inductor and a power output; feedback paths coupled to (1) the switching node and (2) the power output, the feedback paths enabling feedback of signals from (1) the switching node, and (2) the power output; and a processor coupled to the feedback paths. The processor may be configured to control a voltage at the power output based on a combination of the signals carried by the feedback paths.

Abstract: A switched-mode power supply includes: a switching converter converts an input voltage into an output voltage in accordance with a switching signal, wherein the switching converter includes a transformer providing galvanic isolation between a primary side and a secondary side of the switching converter; and a wake-up circuit connected to the secondary side of the switching converter, the wake-up circuit coupled to the secondary side of the switching converter and operable to generate a feedback signal that indicates whether the output voltage is greater than or equal to a threshold value. A primary side regulator generates a control signal depending on a reference value and a measured value (VAUX) representing the output voltage. Primary side logic generates the switching signal depending on the control signal. A tracking unit receives the feedback signal via a galvanically isolating component and adjusts the reference voltage based on the feedback signal.

Abstract: Provided are a semiconductor circuit and a semiconductor system. A semiconductor circuit includes a bandgap reference voltage generation circuit including an operational amplifier to amplify a differential voltage between a first node and a second node; a first startup circuit which receives input of an output signal of the operational amplifier from an output voltage node of the bandgap reference voltage generation circuit and pulls up the second node; and a second startup circuit which pulls down the output voltage node.

Abstract: Two versions of an isolated single stage converter AC/DC Power Factor Corrected (PFC) converter topology have been invented. One is with a full bridge rectifier at its input and the other is a True Bridgeless version. The two versions of the topology feature new configurations and circuitry including a simplified damper circuit and a clamp capacitor flipping circuit and control methods that allow them to realize improved single stage isolated power factor converters which are suitable for high power operation, features Zero Voltage Switching to maximize conversion efficiency and to minimize ElectroMagnetic Interference generation, does not need an additional circuit to limit the inrush current, achieves reasonably low input current Total Harmonic Distortion (THD), and is easy to control. The second version provides a true bridgeless single stage isolated power factor converter with even higher efficiency and lower input current THD.

Abstract: A power supply for providing power to a load includes a main rectifier having first and second rectifier input terminals coupled to an alternating current (AC) power source, which converts AC power from the AC power source into a first direct current (DC) power signal at first and second rectifier output terminals, across which an energy storage device is coupled. A DC-DC power converter (e.g., a PFC circuit) comprises an integrated circuit (IC) and converts the first DC power signal into a second DC power signal in response to a multiplier signal received at a multiplier input of the IC. A multiplier input circuit as disclosed herein is coupled to the first and second rectifier input terminals and provides the multiplier signal to the multiplier signal input terminal, wherein the multiplier input circuit is decoupled from the energy storage device via the main rectifier.

Abstract: A constant current circuit includes a first current mirror circuit connected to a first power supply and having a first input transistor and a first output transistor of a first conductivity type, a second current mirror circuit having a second output transistor of a second conductivity type provided between the first input transistor and a second power supply, and a second input transistor of the second conductivity type provided between the first output transistor and the second power supply, a resistor interposed between the second output transistor and the second power supply, and a capacitor having one end connected to the first power supply and the other end connected to a connecting point of the second output transistor and the resistor.

Abstract: In a power conversion circuit in which a grounded capacitor is connected to a main circuit that converts power through operation of a semiconductor switching device, a control IC that supplies a drive signal to the semiconductor switching device generates a cancellation voltage for canceling out a conducted emission that develops across terminals of the grounded capacitor as a result of the operation of the semiconductor switching device by using the drive signal (gate signal) to control a charge/discharge current of a compensation capacitor in a compensation circuit that is externally connected to the main circuit.