Abstract: A power controller monitors and controls supply of AC power to a load. A power supply derives DC power supply voltages from the input AC power. The power supply includes power dissipation circuit that dissipates excess power as a function of one of the supply voltages. A voltage sensing circuit provides a voltage sense signal that is a function of the voltage of the input AC power. A digital processor controls a switch that connects a load to the AC power based upon the voltage sensed signal.

Abstract: A controller for a multiphase converter comprises a first stage controller for producing a first gate drive signal to turn on a first power transistor of a first boost converter; a delay element configured to produce a delayed signal by delaying the first gate drive signal by half a cycle length; a time difference detection element configured to: output a turn on command based on a zero crossing detection (ZCD) signal indicating that one or more zero current conditions of a second boost converter of the multiphase converter are met and the delayed signal; and a second stage controller configured to assert a second gate drive signal to turn on a second power transistor of the second boost converter based on the turn on command.

Abstract: Provided is a current mirror circuit (1) for balancing respective currents in a plurality of parallel circuit branches (2) in a target circuit (3), the current mirror circuit (1) including: a plurality of balancing transistors (4), each having a connector (5), an emitter (6), and a base (7), the collector (5) and emitter (6) of each balancing transistor (4) connected in series with a respective circuit branch (2); a selection circuit (8) that connects the circuit branch (2) having the smallest current amongst the circuit branches (2) to the bases (7) of each balancing transistor; and an isolation circuit (9) that isolates circuit branches (2) having an open circuit fault from the rest of the target circuit (3). An associated method of balancing respective currents in a plurality of parallel circuit branches (2) in a target circuit (3) is also provided.

Abstract: A voltage converter system includes a first DC-AC voltage converter that converts a first DC voltage signal to a first AC voltage signal. A DC link converts the first AC voltage signal to a second DC voltage signal. A second DC-AC voltage converter converts the second DC voltage signal to a second AC voltage signal. In another configuration a DC-AC voltage converter converts a DC voltage signal to a first AC voltage signal. An AC-AC voltage converter converts the first AC voltage signal to a second, lower-frequency AC voltage signal. In yet another configuration a first voltage converter portion converts a DC voltage signal to pulses of DC voltage. A second voltage converter portion converts the pulses of DC voltage to a relatively low-frequency AC voltage signal. The voltage converter system is selectably configurable as a DC-AC voltage converter or an AC-DC voltage converter.

Abstract: A circuit includes a switching module, a control module, and a driving module. The driving module is electrically coupled between the control module and the switching module for generating a driving signal. The driving module includes a normal driving unit and a fault protection unit. The normal driving unit is for turning on and off the switching module according to a first command signal from the control module. The fault protection unit is for lowering the driving signal from a driving value to a protection value according to a second command signal from the control module during a fault protection period after the control module receives a fault signal.

Abstract: The time when a switch is turned on from the time of one voltage valley to the time of another voltage valley may be adjusted for controlling an average load current or average load voltage. In some examples, the adjustment is instantaneous, and in some examples, the adjustment is gradual. Both of these example techniques provide for high switching efficiency of the switch.

Abstract: Provided is a DC-AC conversion device capable of reducing ripple current output from a battery.

Abstract: The present disclosure illustrates a single-inductor dual-output (SIDO) power converter for hysteresis current control mode and a control method thereof. In the SIDO power converter provided by the instant disclosure, a detecting circuit, connected to the upper bridge transistor, determines whether the inductive current reaches the upper limit threshold or the lower limit threshold, and further drives a control circuit to turn on or off the corresponding upper bridge transistor and/or the lower bridge transistor, so as to simplify the operation of the hysteresis current control mode.

Abstract: In a controller for a DC to DC converter, PWM signal generating circuitry generates a set of PWM signals phase-shifted relative to one another, and controls states of the PWM signals according to a set of control signals. Each PWM signal of the PWM signals has an on-time state and an off-time state. Ramp signal generating circuitry, coupled to the PWM signal generating circuitry, generates a set of ramp signals having substantially the same ramp slope. Each ramp signal of the ramp signals is generated in response to detecting an on-time state of a corresponding PWM signal of the PWM signals. Additionally, a comparing circuit, coupled to the PWM and ramp signal generating circuitry, alternately compares the ramp signals with a preset reference to generate the control signals. A corresponding control signal of the control signals changes the corresponding PWM signal from the on-time state to an off-time state.

Abstract: The system and method creates a substantially constant output voltage ripple in a buck converter in discontinuous conduction mode by varying the on-time of a pulse width modulator (PWM) signal driving the buck converter when the buck converter is operating in discontinuous conduction mode. A first signal is generated that is a function of the switching frequency of the buck converter. This signal is low-pass filtered and compared with a second signal that is a function of the switching frequency of the buck converter when operating in continuous conduction mode and with constant PWM on-time. The output signal generated by the comparator is a signal that is equal to the ratio of the first signal and the second signal. The on-time of a voltage controlled oscillator is controlled by the output signal, the oscillator signal causing the on-time of the PWM signal to vary in a controlled fashion.

Abstract: A system for converting a first voltage into a second voltage includes input terminals and output terminals, switching members disposed between the terminals which can convert voltage, and a device for controlling the switching members. The device includes a cell for controlling a switching member, and a member for managing and supplying the control cell. The member is connected to the control cell by a link allowing the simultaneous transmission of a control signal and electrical energy. The member includes a device for generating a pulse, and which includes at least two different control intervals.

Abstract: A reconfigurable drive current system includes drive stages, each of which includes a high-side transistor and a low-side transistor in a totem pole configuration. A current monitor is coupled to an output of each drive stage. Input channels are provided to receive input signals. A processor is coupled to the input channels and to each current monitor for generating at least one drive signal using at least one of the input signals and current measured by at least one of the current monitors. A pulse width modulation generator is coupled to the processor and each drive stage for varying the drive signals as a function of time prior to being supplied to at least one of the drive stages.

Abstract: A switching-capacitor regulator with a charge injection mode for a high loading current is used to generate an output voltage at an output node, where the switching-capacitor regulator includes a storage capacitor, a switch module, a current source and a control unit. The switch module is coupled between the storage capacitor, a first supply voltage, a second supply voltage and the output node. The current source is coupled to the output node, and is used for selectively providing a current to the output node. The control unit is coupled to the switch module and the output node, and is used for controlling the switch module to selectively charge or discharge the storage capacitor, and for controlling the current source to selectively provide the current to the output node, to adjust a voltage level of the output voltage.

Abstract: A power adaptor to supply power for a portable device has an input circuit (21) for receiving mains input power, a power switch device (25), a power inductance (24) and an output circuit (22) coupled to the power inductance to provide the supply power for the portable device, and a controller (26) for controlling the power switch device according to a supply power requirement of the portable device. The adaptor has a measurement inductance (27) magnetically coupled to the power inductance, and the controller comprises a measurement input (28) for detecting a measurement signal indicative of a magnetic state of the power inductance. The controller detects the supply power requirement based on the magnetic state in response to a controlling of the power switch device via the controller. Advantageously different portable devices can be supplied by appropriate power.

Abstract: A hysteretic current mode buck-boost voltage regulator including a buck-boost voltage converter, a switching controller, a window circuit, a ramp circuit, and a timing circuit. The timing circuit may be additional ramp circuits. The voltage converter is toggled between first and second switching states during a boost mode, is toggled between third and fourth switching states during a buck mode, and is sequentially cycled through each switching state during a buck-boost mode. The ramp circuit develops a ramp voltage that simulates current through the voltage converter, and switching is determined using the ramp voltage compared with window voltages provided by the window circuit. The window voltages establish frequency, and may be adjusted based on the input and output voltages. The timing circuit provides timing indications during the buck-boost mode to ensure that the second and fourth switching states have approximately the same duration to provide symmetry of the ramp signal.

Abstract: A power conversion apparatus includes: a first smoothing capacitor and a second smoothing capacitor connected in parallel to each other, an inrush current preventing circuit connected in series to the first smoothing capacitor, the inrush current preventing circuit including an inrush preventing resistor for suppressing an inrush current and a first relay connected in parallel to the inrush preventing resistor; a second relay connected in series to the second smoothing capacitor; an inverter circuit for converting the output smoothed by the first smoothing capacitor and the second smoothing capacitor into an AC voltage and outputting the AC voltage to a load; and relay controlling means for controlling a switching operation of the first relay and the second relay.

Abstract: A power supply equipment includes a plurality of units each including a capacitor and an isolated DC-DC converter connected between the both terminals of the capacitor, wherein DC input sides of the plurality of units are connected in series and the DC output sides are connected together in parallel. The DC power supply equipment also comprises control circuits to control the isolated DC-DC converters. The control circuits generate operation commands to operate some of the plurality of units in an alternating sequence with a same time ratio in a predetermined control period in a light load condition, and the control circuits control the isolated DC-DC converters of the units according to the operation command.

Abstract: An apparatus comprises an isolated power converter coupled to an input dc power source, wherein the isolated power converter comprises a primary switching network operating at a fixed switching frequency, a secondary resonant tank including a dc blocking capacitor and a rectifier having two input terminals coupled to the secondary resonant tank, an output capacitor coupled between a first output terminal of the rectifier and a load and a dc/dc converter coupled between a second output terminal of the rectifier and the load.

Abstract: A circuit and method for providing a temperature compensated voltage comprising a voltage regulator circuit configured to provide a regulator voltage, a voltage reference circuit configured to provide a reference voltage, VREF, a comparison circuit configured to provide a control voltage VCTL, and an operational amplifier configured to provide amplification and coupling to said comparison circuit, wherein the voltage can be a high voltage greater than 1.2 V.

Abstract: An example method for controlling a circuit may include determining an input signal in a circuit, the input signal comprising distortion; determining a fundamental component of the input signal; determining an error of the input signal using the input signal and the fundamental component; determining a distortion metric using the error; and controlling the circuit as a function of the distortion metric.