Abstract: A method of operation for flyback power converter includes operating a controller of the flyback power converter in a regulation mode when a control signal is below a first threshold. The control signal is provided as an input to a terminal of the flyback power converter. When the control signal is below a second threshold and above the first threshold, the controller is operated in a limiting mode. The controller is operated in an external command mode when the control signal is below a third threshold and above the second threshold. Lastly, when the control signal is above the third threshold, the controller is operated in a protection mode.

Abstract: A method of operating a switching power converter having at least one power switch controlled by a drive signal having a switching frequency is disclosed. The method includes monitoring an output power of the switching power converter, determining whether the output power has decreased below a threshold level and, in response to the output power decreasing below the threshold level, changing the switching frequency of the drive signal from a first switching frequency to a second switching frequency when an operating condition of the switching power converter is satisfied. Also disclosed are controllers and switching power converters (including PFC converters).

Abstract: A semiconductor device is provides which includes: a first boost circuit that generates a first boost voltage by boosting an external voltage and supplies the first boost voltage to an internal circuit; and a first circuit that supplies the external voltage to an output of the first boost circuit when power is turned on and supplies the first boost voltage to the output of the first boost circuit when the external voltage reaches a given voltage.

Abstract: A controller of an AC/DC flyback switching power supply uses adaptive digital control approaches to control the switching operation of a BJT power switch based on primary-side feedback to regulate the secondary-side constant output voltage and output current, without using the input line voltage. Switching-cycle by switching-cycle peak current control and limit are achieved based on the sensed primary-side current rather than the input line voltage in both constant-voltage and constant-current modes, operating in PWM, PFM and/or combinations of a plurality of PWM and PFM modes. The controller IC does not need a separate pin and ADC circuitry for sensing the input line voltage. The controller IC directly drives the BJT base, and dynamically adjusts the BJT base current amplitude cycle by cycle based on load change.

Abstract: A synchronous rectifier circuit (DC-DC converter) includes a CR integration circuit and a discharge circuit. The CR integration circuit outputs a voltage that varies at delayed timing as compared with a voltage induced in a secondary-side main winding. The discharge circuit discharges a gate voltage of a rectifier transistor as a result of conduction of a discharge transistor in response to the output voltage from the CR integration circuit. According to such a configuration, the rectifier transistor is turned off earlier than the timing of switching of polarity of voltages induced in the secondary-side main winding and a secondary-side auxiliary winding in response to turn-on of a primary-side transistor.

Abstract: An inverter for converting an input direct current (DC) waveform from a DC source to an output alternating current (AC) waveform for delivery to an AC grid includes an input converter, an output converter, and an active filter, each of which is electrically coupled to a bus. The bus may be a DC bus or an AC bus. The input converter is configured to convert the input DC waveform to a DC or AC bus waveform. The output converter is configured to convert the bus waveform to the output AC waveform at a grid frequency. The active filter is configured to reduce a double-frequency ripple power of the bus waveform by supplying power to and absorbing power from the power bus.

Abstract: The systems and methods described herein provide for a universal controller capable of controlling multiple types of three phase, two and three level power converters. The universal controller is capable of controlling the power converter in any quadrant of the PQ domain. The universal controller can include a region selection unit, an input selection unit, a reference signal source unit and a control core. The control core can be implemented using one-cycle control, average current mode control, current mode control or sliding mode control and the like. The controller can be configured to control different types of power converters by adjusting the reference signal source. Also provided are multiple modulation methods for controlling the power converter.

Abstract: An electric power conversion apparatus includes a converter 1 for rectifying ac electric power, a series-connected set, of capacitors 2A and 2B, connected to the dc side of the converter, an inverter 3 for, by setting one end of the series-connected capacitor set to a high-potential level, the other end of the set to a low-potential level, and a connection point between the capacitors to a medium-potential level, selecting any one of the levels and outputting three-phase ac, an inverter control unit 4 for controlling the inverter 3, and a voltage measurement device 8 for measuring a capacitor voltage Vdc as a voltage between both ends of the series-connected set, of the capacitors 2A and 2B; and the inverter control unit 4 further includes a beatless control unit 21 for controlling a modulation factor ? in response to the capacitor voltage Vdc, and a frequency fixing unit 22 for fixing to a command value the frequency of an ac voltage outputted from the inverter 3.

Abstract: In accordance with the teachings described herein, systems and methods are provided for a switching mode power supply. In one example, the switching mode power supply may include a transformer, a switching circuit and a switching control circuit. The transformer receives a DC input voltage on a primary winding and generates a DC output voltage on a secondary winding. The switching circuit, which may include a MOSFET switch, is coupled to the transformer and is configured to switch the transformer on and off. The switching control circuit generates a switching control signal to control the switching circuit in order to regulate the DC output voltage of the transformer.

Abstract: An electric power supply circuit includes a switching element (S) for causing a short-circuit for output power of a diode bridge circuit (12), a zero-cross detector section (5a) for detecting a point at which an input voltage reaches a level equal to or lower than a reference level, a timer section (5d) for starting a count upon the detection by the zero-cross detector section (5a), and a PAM waveform output section (5c) for causing the switching element (S) to perform switching with a predetermined output timing so that a waveform of the input current is caused to approximate to a sine wave. The circuit further includes a correction section (5e) for correcting, when a difference between a detection interval from detection to detection by the zero-cross detector section (5a), and an average value for detection intervals up to current detection occurs, an initial value of the count of the timer section (5d) according to the difference.

Abstract: A method and apparatus to regulate voltage used to power an ASIC comprising an ASIC having a signal source and a modulator. The modulator establishes a characteristic of a signal created by the signal source to indicate a voltage level to be used to power the ASIC. The signal is communicated to a voltage regulator to apply an optimal voltage to the ASIC.

Abstract: Various systems, methods and apparatuses are provided herein for limiting power dissipation in a switch. As one example, a method for limiting power dissipation is disclosed. The method includes monitoring current through the switch, and based at least in part on detecting that the current is at least as great as a predetermined current limit, regulating the current to the predetermined current limit. The method also includes measuring an amount of power dissipated in the switch while the current is being regulated, and opening the switch when the amount of power has reached a predetermined power limit.

Abstract: A power supply module includes an AC/DC converter, a voltage transforming circuit, a feedback circuit, and a detecting circuit. The AC/DC converter is used for converting the input AC voltage to a primary DC voltage. The voltage transforming circuit is used for transforming the primary DC voltage to the first DC voltage. The feedback circuit is used for sampling the first DC voltage to generate a feedback signal. The detecting circuit is used for detecting if the power supply module is powered on, and generating a first voltage when detecting that the power supply module is powered on. Wherein the voltage transforming circuit maintains the first DC voltage at a first predetermined value according to the feedback signal, the feedback circuit increases a magnitude of the feedback signal according to the first voltage.

Abstract: An embodiment of a power-supply controller comprises a switching-control circuit, an error amplifier, and a signal generator. The switching-control circuit is operable to control a switch coupled to a primary winding of a transformer, and the error amplifier has a first input node operable to receive a feedback signal, a second input node operable to receive a comparison signal, and an output node operable to provide a control signal to the switching-control circuit. The signal generator is operable to generate either the feedback signal or the comparison signal in response to a compensation signal that is isolated from a secondary winding of the transformer and that is proportional to a load current through a conductor disposed between the secondary winding and a load.

Abstract: A replica biased voltage regulator circuit and method of load regulation are provided herein. According to one embodiment, the replica biased voltage regulator circuit includes an operational amplifier and a comparator, wherein outputs of the operational amplifier and comparator are respectively and simultaneously supplied to a front gate and a back gate of an output stage transistor included for regulating an output voltage generated by the replica biased voltage regulator circuit.

Abstract: A power converting apparatus includes three sets of half-bridge inverters connected between output terminals of a solar battery, each of the half-bridge inverters including two series-connected switching devices, single-phase inverters connected to individual AC output lines of the bridge inverters, and two series-connected capacitors dividing a voltage of the solar battery, wherein output terminals of the single-phase inverters are connected to individual phases of a three-phase power system. Each of the half-bridge inverters is operated to output one pulse per half cycle, each of the single-phase inverters is controlled by PWM control operation to make up for a voltage insufficiency from the system voltage, and sums of outputs of the half-bridge inverters and the single-phase inverters are output to the power system.

Abstract: An inverter includes a pulse width modulation (PWM) circuit, a direct current (DC) voltage input terminal, a storage capacitor, a first transformer, a soft start circuit, and a first transistor. The PWM circuit includes a first output terminal. The first transformer includes a first primary winding. The first primary winding includes a first terminal and a second terminal capable of being grounded via the storage capacitor. The soft start circuit includes an inductor and a first capacitor. A gate electrode of the first transistor is connected to the first output terminal. A source electrode of the first transistor is connected to the first terminal of the first transformer via the inductor. A drain electrode of the first transistor is connected to the DC voltage input terminal and connected to the source electrode via the capacitor.

Abstract: A voltage control mode buck converter circuit includes a feedback amplifier providing a comparison signal and a storage circuit in communication with the comparison signal to store a storage comparison signal value. The storage circuit stores the operating conditions for the circuit during normal continuous conduction mode operation in response to sensing a load drop for the circuit. A switching circuit locks the feedback amplifier into the stored operating parameters while the converter circuit operates in non-continuous conduction mode. When the circuit transitions back into the continuous conduction operation mode, the feedback amplifier is already operating at conditions that are compatible with a continuous conduction operation mode.

Abstract: In one implementation, an apparatus includes a first input terminal configured to receive a bias voltage, the bias voltage received from a low-dropout voltage regulator (LDO) error amplifier, and a second input terminal configured to receive a supply voltage; a first output terminal configured to supply a feedback voltage, the feedback voltage supplied to the LDO error amplifier, and a second output terminal configured to supply regulated power to an associated load; a regulating portion configured to regulate power supplied to the associated load; and a switching portion configured to enable or disable the load from receiving the regulated power.

Abstract: An electronic device that includes a motion activated amplifier structured to receive a first DC signal having a first DC voltage level and output a second DC signal having a second DC voltage level that is greater than the first DC voltage level. The motion activated amplifier includes a motion activated switch operatively coupled to transformer/rectifier circuitry, wherein the motion activated switch is structured to receive the first DC signal and in response to being moved output an AC signal, and wherein the transformer/rectifier circuitry is structured to receive the AC signal and convert the AC signal into the second DC signal.