Abstract: System and method for protecting a power converter. An example system controller for protecting a power converter includes a signal generator, a comparator, and a modulation and drive component. The signal generator is configured to generate a threshold signal. The comparator is configured to receive the threshold signal and a current sensing signal and generate a comparison signal based on at least information associated with the threshold signal and the current sensing signal, the current sensing signal indicating a magnitude of a primary current flowing through a primary winding of a power converter. The modulation and drive component is coupled to the signal generator.

Abstract: This invention eliminates the need for “capacitor coupling” or “transformer coupling,” and the associated undesirable parasitic capacitance and inductance associated with these coupling techniques when designing high frequency (˜60 GHz) circuits. At this frequency, the distance between two adjacent stages needs to be minimized. A resonant circuit in series with the power or ground leads is used to isolate a biasing signal from a high frequency signal. The introduction of this resonant circuit allows a first stage to be “directly coupled” to a next stage using a metallic trace. The “direct coupling” technique passes both the high frequency signal and the biasing voltage to the next stage. The “direct coupling” approach overcomes the large die area usage when compared to either the “AC coupling” or “transformer coupling” approach since neither capacitors nor transformers are required to transfer the high frequency signals between stages.

Abstract: A switching power supply apparatus of each embodiment includes: a switch circuit configured to supply a pulse output to a load; a drive signal control circuit configured to perform ON/OFF driving operation of the switch circuit according to a duty ratio of a PWM signal; an error detection amplifier configured to compare output voltage supplied to the load and reference voltage and generate an error detection signal; a comparator configured to generate the PWM signal by comparison between a slope signal that starts level change in a cycle of the PWM signal and the error detection signal and give the PWM signal to the drive signal control circuit; and a spread spectrum correction circuit configured to generate an offset corresponding to the fluctuation of the cycle of the PWM signal and add the generated offset to the slope signal or the error detection signal.

Abstract: A switching regulator includes a switching element, a first error amplification circuit amplifying a difference between a voltage based on an output voltage and a first reference voltage and providing a first error voltage, a clamp circuit generating a second error voltage at an output node based on the first error voltage and a second reference voltage, a PFM comparison circuit comparing the second error voltage and the second reference voltage to output a comparison result, an oscillation circuit providing and stopping a clock signal according to the comparison result, and a PWM conversion circuit turning on/off the switching element based on the second error voltage and the output of the oscillation circuit. The clamp circuit clamps a lower limit value of the second error voltage to a voltage obtained by subtracting a prescribed voltage from the second reference voltage.

Abstract: A switching power supply device includes a switching element and a diode and generates an output voltage by supplying current to a coil by controlling the switching element to turn on and off. A current detection circuit detects a current flowing in the switching element. A voltage detection circuit monitors a voltage at an output terminal OUT. A control circuit controls the switching element to turn on and off by a current control mode based on a current detection signal and a feedback voltage. The control circuit drives a bleeder circuit to supply a load current to the output terminal when a level of the current detection signal is lower than a predetermined level.

Abstract: Timing circuitry causes: a first closed signal on a first switch control output before a signal on a second switch control output changes from a second closed signal to a first open signal; the first switch control output to provide a second open signal after a first selected time after the second switch control output changes from the second closed signal to the first open signal; and a third switch control output to provide a third closed signal a second selected time after the first switch control output changes from the first closed signal to a third open signal. A beginning of the first closed signal to a beginning of the first open signal is based on a later of: a current through a switch connected to the second switch control output exceeding a threshold current; and a clocked time after the beginning of the first closed signal.

Abstract: A power fluctuation mitigation system for use in a power supply system that supplies AC power to a load includes an inverter unit including a first converter connected to an AC power supply to perform DC/AC conversion, a DC intermediate condenser, and an inverter connected to the first converter through the DC intermediate condenser to perform DC/AC conversion, and a power fluctuation mitigating device including a second converter connected to the AC power supply to perform AC/DC conversion, a capacitive storage device configured to be charged by an output of the second converter, and a charging unit to charge the DC intermediate condenser with power stored in the capacitive storage device, wherein the charging unit supplies power from the capacitive storage device to the DC intermediate condenser upon occurrence of fluctuation in an output of the inverter unit occurring in response to fluctuation in the load.

Abstract: A DC-to-DC controller and a control method thereof are provided. The DC-to-DC controller couples to an output stage, and the output stage provides an output voltage and includes an upper bridge switch and a lower bridge switch. The DC-to-DC controller includes a time signal generating unit and a time signal control circuit. The time signal control circuit couples to the time signal generating unit and receives a preset voltage and the output voltage. During a soft start period, if the output voltage is lower than the preset voltage, after the upper bridge switch is turned off and before the upper bridge switch is turned on again, the time signal control circuit turns off the upper bridge switch and the lower bridge switch for a first preset time and turns on the lower bridge switch for a second preset time.

Abstract: In a DC/DC converter, when stepping up voltage from an input unit to an output unit or when stepping down voltage from the output unit to the input unit, a second driver IC outputs to a charge pump circuit a control signal for controlling a switching element so as to alternately repeat ON/OFF when a switching element is ON and a switching element is OFF. When stepping up voltage from the output unit to the input unit or when stepping down voltage from the input unit to the output unit, a first driver IC outputs to the charge pump circuit a control signal for controlling the switching element so as to alternately repeat ON/OFF when a switching element is ON and the switching element is OFF. As a result, the DC/DC converter can drive the charge pump circuit without providing an oscillation circuit.

Abstract: The disclosure relates to an inverter for supplying a power provided as a DC voltage at a DC input to an AC mains connectable to an AC output. In this case, the inverter includes a switching network with a plurality of semiconductor switches and a digital control unit for producing a digital switching pattern for digitally operated semiconductor switches of the switching network that are able to be used to produce a first output voltage (Uout,dig). The inverter additionally includes a linear control unit for producing signals for actuating at least one semiconductor switch of the switching network in a linear mode, wherein the linear control unit is set up to produce a voltage drop (Uout,lin) across and/or a current (Iout,lin) through the at least one linearly operated semiconductor switch to a target value that is dependent on an instantaneous difference between the first output voltage (Uout,dig) and a voltage (UAC) of the AC mains.

Abstract: A low dropout voltage regulator for generating an output regulated voltage is provided. The low dropout voltage regulator includes a first transistor and a current recycling circuit. The first transistor has a first terminal for receiving an input supply voltage, a second terminal for generating the output regulated voltage, and a control terminal for receiving a control voltage. The current recycling circuit is configured to drain a feeding current to the second terminal of the first transistor in response to a first signal having feedback information of the output regulated voltage.

Abstract: A method, apparatus, and system to control a multi-phase converter having at least one power channel with a plurality of power modules, and involves detecting the voltage and the current of the power modules, calculating a command voltage based on a product of a programmed virtual resistance and the detected current, and transmitting a command voltage signal to the power modules based on the calculated command voltage.

Abstract: In an electric power conversion circuit, a gate controller executes a first operation. In the first operation, the gate controller performs control such that a first lower FET, a first upper FET, a second lower FET, and a second upper FET satisfy the following conditions: a condition that a first state in which the first lower FET is turned on, a second state in which both of the lower FETs are turned off, a third state in which the second lower FET is turned on, and a fourth state in which both of the lower FETs are turned off appear repeatedly in the order; and a condition that the first upper FET is turned on at a middle of a period of the second state and is maintained in an on state until a middle of a period of the third state.

Abstract: A multipurpose power supply suitable for a power switch driver circuit takes an input voltage and generates output voltages at four output terminals. Two output terminals may be connected to voltage supply rails to drive a switched-mode power converter. The voltage output at each output terminal relative to ground is different, allowing the voltage rails to be set to voltages suitable for a variety of different power-switch driver circuits by adjusting the output terminals to which the voltage rails are connected. A reference voltage is applied to one output terminal in order to set the values of the voltages at the remaining output terminals.

Abstract: A method for controlling a voltage regulator is receiving a voltage identification code which has a pulse width modulation signal, providing a duty signal via measuring a duty cycle of the pulse width modulation signal, calculating a target voltage based on the duty signal, providing a reference signal via filtering the duty signal by a first filter if the voltage identification code varies, and providing the reference signal via filtering the duty signal by a second filter if the reference signal is in a range determined by the target voltage.

Abstract: A converter comprises a plurality of controllable two-pole sub-modules connected in series. At least some of the sub-modules each comprises a first and a second sub-module connection, a first, a second, a third and a fourth controllable switch, and a storage dipole, which comprises a first and a second dipole connection, an energy store and a controllable switching device, wherein the controllable switching device has a first selectable switching state, in which the storage dipole outputs no energy, and a second selectable switching state, in which the store of the storage dipole can take up or discharge energy. The sub-module has a selectable conduction state, in which the controllable switching device of the storage dipole assumes the first switching state and the first to fourth switches are switched such that a current flows through the sub-module on two parallel branches.

Abstract: A switched-mode power regulator circuit has four solid-state switches connected in series and a capacitor and an inductor that regulate power delivered to a load. The solid-state switches are operated such that a voltage at the load is regulated by repetitively (1) prefluxing the inductor then charging the capacitor causing an increased current to flow in the inductor and (2) prefluxing the inductor then discharging the capacitor causing increased current to flow in the inductor. The inductor prefluxing steps enable the circuit to provide increased output voltage and/or increased output current.

Abstract: A switching regulator having adjustable inductor current threshold employs a control method which includes: (S1) determining whether an output voltage is greater than a reference voltage or determining whether a switching frequency of the power stage is smaller than a predetermined lower frequency limit, and (S2) when it is determined yes in the step (S1), adjusting the inductor current threshold, such that the switching regulator operates under a pseudo discontinuous conduction mode (PDCM) wherein the switching frequency is not smaller than the predetermined lower frequency limit. Consequently, when the switching regulator operates under a light load mode, an optimum balance between a total power consumption and switching noise interference will be ensured.

Abstract: A switching power converter is provided that cycles a power switch during a group pulse mode of operation to produce a train of pulses within a group period responsive to a control voltage being within a group mode control voltage range. Depending upon the control voltage, the number of pulses in each train of pulses is varied to provide a linear power delivery to the load.

Abstract: A bidirectional bridgeless buck-boost power converter circuit is provided that can function as both a voltage source inverter (VSI) circuit to transform direct current (DC) voltage to alternating current (AC) voltage and as a power factor corrector (PFC) circuit to transform AC voltage to DC voltage. The disclosed converter fully utilizes inductors to form a CL filter and buck-boost converter energy storage element. Thus, low inductance chokes are used in the converter, which leads to a higher power density and is more cost-effective. Further, the bridgeless configuration minimizes conduction losses of semiconductors, and coupled with the use of low inductance chokes this improves system efficiency.