Abstract: A boost DC-DC converter operating in pulse frequency modulation (PFM) and pulse width modulation (PWM) modes includes a plurality of PWM signal generators. The PWM signal generators generate PWM signals with different duty cycles. PWM signals with larger duty cycles may be selected for use in undervoltage situations.

Abstract: A synchronous rectifier controller is provided on a secondary side of an insulation-type synchronous DC/DC converter and controls the synchronous rectifier transistor. A driver circuit controls the synchronous rectifier transistor. A photo coupler connection terminal is coupled to an input side of the photo coupler. An error amplifier amplifies an error between a voltage detection signal according to an output voltage of the DC/DC converter and its target voltage, and to draw a current according to the error from an input side of the photo coupler via the photo coupler connection terminal.

Abstract: The present disclosure relates to a supply voltage generating circuit and a switching power supply having the circuit. The supply voltage generating circuit provides a supply voltage for a power terminal of a control circuit in the switching power supply. The supply voltage generating circuit includes a switching circuit, a unidirectional conduction circuit and an energy storage circuit. In a time period during which a main power transistor is turned off, the switching circuit is turned off and a rectifying device provides a current to the energy storage circuit through the unidirectional conduction circuit, in a case that the supply voltage is smaller than a predetermined voltage reference; and the switching circuit is turned on and the current output from the rectifying device flows to the switching circuit, in a case that the supply voltage is larger than or equal to the predetermined voltage reference.

Abstract: In accordance with an embodiment, a method of operating a power supply includes detecting a loss of at least one of an AC input voltage an AC input power at an input of the power supply, and increasing a switching frequency of the power supply upon detection of the loss of the AC input voltage or AC input power.

Abstract: Power supply and drive device for a permanent magnet motor including a full-wave voltage rectifier stage, which can be supplied with an alternating current voltage to provide a rectified voltage, a power factor corrector stage, a smoothing capacitor to provide a direct current voltage and a motor drive stage, which is supplied with the direct current voltage and provides a signal indicating the power required by the motor. The smoothing capacitor is not of the electrolytic type and the power factor corrector stage has feedback control means to generate a reference current as a function of the direct current voltage and of the signal indicating the power required and to control an input current of the power factor corrector stage as a function of the reference current.

Abstract: In a DC/DC converter, a first switching circuit is connected between a first winding of a transformer and a DC power supply, and a second switching circuit is connected between a second winding and a battery. In charging the battery, a control circuit controls respectively phase shift amounts of first and second diagonal elements in the first and second switching circuits relative to the drive phase of a first reference element in the first switching circuit. During a step-up charge control period, if charge current is positive or zero, the control circuit performs control so that the phase shift amount becomes greater than the phase shift amount by an amount exceeding a short-circuit prevention time for the switching elements, allowing step-up operation to be performed, improving controllability in step-up control.

Abstract: A multilevel power conversion device includes: N (N?1) direct current voltage sources; a first flying capacitor; a second flying capacitor; and a phase module of a M phase (M?2) being configured to output, from the output terminal, a potential of one of the input terminals, or a potential obtained by adding or subtracting the voltage of the capacitor to or from the potential of the one of the input terminals, by selectively controlling the respective switching elements in an ON/OFF manner.

Abstract: A switching unit of an embodiment includes a first switching element of normally-on type, a second switching element of normally-off type having a non-reference potential side conductive terminal connected to a reference potential side conductive terminal of the first switching element, a resistive element having one end connected to a conduction control terminal of the first switching element; a series capacitor connected between the other end of the resistive element and a conduction control terminal of the second switching element; and a diode having an anode connected to the other end of the resistive element and a cathode connected to a common junction of the first switching element and the second switching element.

Abstract: A DC-to-AC power converter (1) includes: a current-type DC-to-AC converter (70) having a first DC input (80) and a first AC output (85), said first DC input (80) being connected in parallel to said main DC input (10) and said first AC output (85) being connected in parallel to said main AC output (20); and a controller (110) for: controlling said bidirectional voltage-type DC-to-AC converter (50) for delivering at said first AC output-input (65) a sinusoidal AC voltage of said fundamental frequency f0; controlling said current-type DC-to-AC converter (70) for delivering at said first AC output (85) a quasi square-type AC current of said fundamental frequency ID and in phase with said sinusoidal AC voltage; imposing that at least 70% of said rated current is provided by said current-type DC-to-AC converter (70).

Abstract: A power management device according to example embodiments includes a self-startup circuit including an oscillator and a voltage multiplier to generate a start-up voltage in a first start-up period based on an input voltage, a boost converter to alternately charge the start-up voltage and an output voltage within a start-up voltage range during a second start-up period and to charge only the output voltage during an operation period, a controller to control the self-startup circuit and the boost converter based on a magnitude of the start-up voltage, a voltage charger including a start-up voltage capacitor and an output voltage capacitor, and a shared inductor connected between the input node and a common input node. The shared inductor operates as a part of the oscillator during the first start-up period and a part of the boost converter during the second start-up and operation periods.

Abstract: Disclosed is a fractional bandgap circuit and method to provide a same reference voltage value in a variety of circumstances of operation, including variations in manufacturing process, temperature, and a supply voltage. The disclosed fractional bandgap circuit and method also allows for low supply voltage operation within a compact layout area.

Abstract: Systems, methods and apparatus for efficient control and biasing of pass devices that include at least one thin pass device and a remaining of thick pass devices. When operated at extreme high and low voltages, the at least one thin pass device maintains operation in its saturation region of operation while the remaining pass devices may be driven into their triode regions of operation. The thin and thick pass devices are arranged in a cascode configuration that includes a plurality of stacked devices. Biasing of the thin and thick cascode devices can be according to a voltage division scheme which protects the devices when the voltage across the stack is high, and provides a skewed voltage division across the stacked devices that promotes a higher gate-to-source voltage of the thick pass devices for a lower RON. In one exemplary case, gate length of the at least one thin pass device may be reduced to provide a lower gate-to-source voltage of the thin pass device during operation in the saturation region.

Abstract: A power conversion device includes a carrier generating unit, a setting unit, a PWM signal generating unit, and a power conversion unit. The carrier generating unit generates a carrier of a particular set carrier frequency during a certain continuation time. The setting unit sets the continuation time to be random and sets one carrier frequency among a plurality of mutually-different carrier frequencies as the set carrier frequency. The PWM signal generating unit generates a PWM signal based on the carrier generated by the carrier generating unit. The power conversion unit executes a power conversion based on the PWM signal and supplies converted power to a load.

Abstract: An intellectual property (IP) block portion in an integrated circuit includes a first regulator, a first circuit, a power converter, and a second circuit. The first regulator is configured to receive a supply voltage and to generate a first output voltage. The first circuit is coupled with the first regulator and configured to receive the first output voltage. The power converter includes a charge pump configured to receive the supply voltage and to generate a pumped voltage; and a second regulator configured to receive the supply voltage or the pumped voltage and to generate a second output voltage. The second output voltage has a voltage level greater than a voltage level of the first output voltage. The second circuit is coupled with the power converter and configured to receive the second output voltage.

Abstract: A power conversion device is provided which includes a plurality of series circuits each formed of a voltage source and a controlled current source. At least two of said series circuits formed of the voltage source and the controlled current source are connected in parallel. Further, parallel connection points of the series circuits connected in parallel form output terminals.

Abstract: The extended commutation cell (ECC) is a four-port, four-switch cell that allows for bidirectional energy transport in two orthogonal directions throughout the cell. By cascading multiple cells, a multilevel converter can be constructed with a high number of levels. The voltage across each cell capacitor can be adjusted independently of the load, resulting in high flexibility in output levels. Improved fault tolerance is also provided.

Abstract: A grid-tied inverter for supplying current to a power supply system includes an output bridge arrangement that is actuated via a pulse width modulator, wherein switching times of the output bridge arrangement are determined by using a periodic auxiliary signal, wherein the frequency of the periodic auxiliary signal varies according to a prescribed periodic wobble signal. The inverter further includes a synchronization unit configured to provide phase synchronization of the auxiliary signal to the power supply system, wherein the synchronization unit is configured to adjust a prescribed phase offset of the periodic auxiliary signal in relation to a phase of the power supply system, and a further synchronization unit configured to provide phase synchronization of the periodic wobble signal to the power supply system.

Abstract: Circuits and methods for driving a load are disclosed. An exemplary driving circuit may include first and second switching devices electrically connected with each other in parallel. The driving circuit may also include a current sensing circuit configured to generate a current sensing signal indicating a value of a current flowing through the first switching device. The current sensing signal may include an offset caused by parasitic inductance imbalance in electrical connections connecting the first and second switching devices. The driving circuit may further include a driver circuit configured to control switching operations of the first and second switching devices. The driver circuit may include an overcurrent protection circuit electrically connected to the current sensing circuit.

Abstract: Multilevel power converters, power cells and methods are presented for selectively bypassing a power stage of a multilevel inverter circuit, in which a single relay or contactor includes first and second normally closed output control contacts coupled between a given power cell switching circuit and the given power cell output, along with a normally open bypass contact coupled across the power stage output, with a local or central controller energizing the coil of the relay or contactor of a given cell to bypass that cell.

Abstract: A rectifier circuit can include a plurality of FETs arranged as a rectifier; and a start-up circuit applied to each of the plurality of FETs that turn each of the FETs off during a circuit startup period, wherein the start-up circuit provides a large impedance for low power dissipation during normal operation of the rectifier.