Abstract: In an embodiment, a method includes generating a pulse-width-modulated signal having a duty cycle, and isolating a power-supply output node in response to the duty cycle corresponding to a signal magnitude that is less than a magnitude of an output signal on the power-supply output node. For example, where a power supply has a non-zero residual output signal (e.g., output voltage) on its output node after the power supply is deactivated, a power-supply controller can use such a technique to reduce or eliminate a drop in the residual output signal caused by, or that would be caused by, a restarting of the power supply.

Abstract: Methods and apparatus for providing adaptive electromagnetic interference control in a power converter are disclosed. An example apparatus includes a current interface to measure an internal current of the power converter. The example apparatus further includes a performance determiner to determine a spur power of an output voltage of the power converter based on the measured internal current. The example apparatus further includes a ramp generator to adjust a hopping configuration of a ramp voltage based on the spur power.

Abstract: A DC-DC converter module includes a module substrate on which switching transistors and a controller IC chip are mounted, stud terminals mounted on a surface of the module substrate, and an inductor attached to the stud terminals such that the inductor faces the module substrate. In a plan view, the switching transistors are arranged within an area where the inductor overlaps the module substrate, whereas at least a portion of the controller IC chip is arranged outside the area.

Abstract: A novel method to generate a feedback signal in a switching regulator is presented. The method includes the generation of a first feedback signal using the switching signal. The first feedback signal carries a ripple and the ripple is in phase with the switching signal. The first feedback signal does not use a control-in terminal PIN. The voltage level of the first feedback signal is regulated through a resistor and a capacitor connected between the switching node and the switching regulator controller. In an alternative method, a second feedback signal is generated using the regulator output voltage. The controller receives the second feedback through a control-in terminal PIN. In the alternative method, another resistor and another capacitor are used to connect the first feedback signal and the second feedback signal. Furthermore, the second feedback signal can adjust the regulator output voltage through two resistors connected in series.

Abstract: An input smoothing circuit is provided between an input line and a ground line. A high-side transistor and a low-side transistor are provided in series between the two ends of the input smoothing circuit. The high-side transistor and the low-side transistor are arranged side by side in a first direction on a circuit board. Two current loops that run through the smoothing circuit, the high-side transistor, and the low-side transistor are formed to be substantially linearly symmetrical with respect to an axis of symmetry that extends in the first direction.

Abstract: A controller for use in a power converter includes a sense circuit coupled to generate a feedback signal representative of an output voltage of the power converter. A feedback reference circuit coupled to generate a drive signal in response to the feedback signal. An output power control circuit coupled to receive a current sense signal representative of an output current of the power converter and a power signal representative of a desired value of an output power of the power converter via an interface. The controller modifies the output voltage to regulate to the output power to the desired value.

Abstract: In accordance with an embodiment, a DC-DC converter is provided comprising a single regulation loop that drives a control circuit, wherein the control circuit selects between operation in a pulse width modulation operating mode and a pulse frequency modulation operating mode, the single regulation loop including a compensation loop, and wherein biasing of the compensation loop is maintained in response to selecting between the pulse width modulation and the pulse frequency modulation operating modes.

Abstract: In one form, a multi-mode converter includes first, second, third, and fourth transistors having respective control terminals and arranged in a four-switch buck-boost (FSBB) configuration for coupling to an inductor. The multi-mode converter also includes a first driver having an input for receiving a first switching signal and an output, a first charge pump having an output, a second driver having an input for receiving a second switching signal and an output, a second charge pump having an output, and a control circuit. The control circuit alternatively couples an output of the first driver or an output of the first charge pump to the control terminal of the first transistor, and the output of the second driver or the output of the second charge pump to the control terminal of the fourth transistor in response to a mode of operation of the multi-mode power converter.

Abstract: A control IC includes a VS voltage detection circuit that indirectly detects input voltage, by utilizing a fact that a voltage of a VS terminal of a reference potential of a high side drive circuit changes to a voltage equivalent to the input voltage when a high side drive signal is output from a control circuit to cause the high side drive circuit to turn on a high side switching element. The VS voltage detection circuit determines the level of the input voltage by sampling the VS terminal voltage at a time point that is delayed by a predetermined time from a rising edge of the high side drive signal, and supplies the determined level to the control circuit.

Abstract: A current balancing circuit is disclosed comprising a first current detector configured to measure a first current flowing from a first supply voltage to a first load, and a second current detector configured to measure a second current flowing through an inductor from a second supply voltage to the first load. The first current is compared to a first threshold to generate an error signal, and the error signal is amplified by a gain to generate a second threshold. When the first current is above the first threshold and the second current is below the second threshold, a first switch is controlled to connect a first end of the inductor to the second supply voltage. When the second current is above the second threshold, a second switch is controlled to connect the first end of the inductor to a current sink.

Abstract: A stacked voltage source inverter having separate DC sources is described herein. This inverter is applicable to low or medium voltage, low to medium power applications such as photovoltaic utility interface systems, battery storage application such as peak shaving with renewables, motor drive applications and for electric vehicle drive systems. The stacked inverter consists of at least one phase wherein each phase has a plurality of low voltage full bridge inverters equipped with an independent DC source. This inverter develops a near sinusoidal approximation voltage waveform with fast switching and small low pass AC output filter. A system controller controls operating parameters for each inverter. The inverter may have either single-phase or multi-phase embodiments connected in either wye or delta configurations.

Abstract: An electronic device disclosed herein includes a linear output stage configured to generate an output voltage to an output node as a function of an input voltage, and a buck output stage configured to generate the output voltage to the output node as a function of the input voltage. Control circuitry is configured to enable the linear output stage and disable the buck output stage if a current demanded by a load to maintain the output voltage at a desired level is less than a limit current, and enable the buck output stage and disable the linear output stage a delay period of time after enabling the buck output stage, if the current demanded by the load to maintain the output voltage at the desired level is greater than the limit current.

Abstract: A power source apparatus includes a power input terminal to which input direct-current power is input from a power source; a first switching regulator coupled to the power input terminal and configured to supply, to a first electronic component, first direct-current power obtained by converting a voltage of the input direct-current power into a first voltage; a second switching regulator coupled to the power input terminal and configured to supply, to a second electronic component, second direct-current power obtained by converting the voltage of the input direct-current power into a second voltage; and a signal generating circuit configured to generate, based on a first oscillation voltage of the first switching regulator, a reference signal to be a reference of a timing of switching the second switching regulator such that the first oscillation voltage and a second oscillation voltage of the second switching regulator become opposite in phase.

Abstract: A power supply has a first stage for performing AC-DC voltage conversion and power factor correction and a second stage for isolated DC-DC voltage conversion. The power supply includes a feed forward mechanism for transmitting phase information corresponding to AC ripple. The phase information is transmitted from the first stage to a secondary side of the second stage as a digital signal using a low speed optical coupler, where the phase information is utilized by a DC-DC digital controller to implement AC ripple suppression using both phase compensation and amplitude compensation.

Abstract: Methods and apparatus provide compensation for impedance changes in a network energized by an amplifier, such as a class E amplifier. In embodiments, bus voltage amplifier fundamental AC output voltage can be used to generate a feedback signal for adjusting impedance of one or more components in the network. In embodiments, the amplifier fundamental AC output voltage is determined from current to the load, wherein the load is coupled to the amplifier by an LCL impedance matching network.

Abstract: An arrangement for changing current return path in a bipole direct current power transmission system includes a converter station having an active and a passive converter connected in series between an active and a passive pole line via a first neutral bus, a metallic return transfer switch in an electrode line, a ground return transfer switch in a current redirecting path between the passive pole line and the neutral bus and a control unit which in case of change to the passive pole line for providing a return current path is configured to, upon control of power related to the active converter from steady-state to zero, close the ground return transfer switch and thereafter open the metallic return transfer switch, whereupon power related to the active converter may be controlled back to steady state.

Abstract: A rectifier including an autonomous type synchronous-rectification MOSFET is provided, which prevents chattering and through-current caused by a malfunction when a noise is applied. The rectifier includes: a rectification MOSFET for performing synchronous rectification; a determination circuit configured to input a voltage between a pair of main terminals of the rectification MOSFET, and to determine whether the rectification MOSFET is in on or off state on the basis of the inputted voltage; and a gate drive circuit configured such that a gate of the rectification MOSFET is turned on and off by a comparison signal from the determination circuit, and such that a time required to boost a gate voltage when the rectification MOSFET is turned on is longer than a time required to lower the gate voltage when the rectification MOSFET is turned off.

Abstract: Disclosed herein is a low voltage direct-current (DC)-DC converter. The low voltage DC-DC converter includes a switching portion which includes a first switching portion and a second switching portion and changes a high voltage provided from a high voltage battery to an alternating current (AC) voltage, a transformer which converts the AC voltage output from the switching portion into a low voltage, and a switching portion zero voltage switching auxiliary circuit portion which is connected between the high voltage battery and the switching portion and operates when operations of the first and second switching portions change to consume residual energy in the switching portion.

Abstract: A voltage control device includes an output module and a control module. The output module provides an output current at an output terminal thereof based on a control voltage. The control module includes a comparing circuit, a capacitor, a charging circuit and a discharging circuit. The comparing circuit compares a to-be-compared voltage, which is associated at least with a to-be-controlled voltage at the output terminal of the output module, with a predetermined reference voltage to generate a comparison signal. The capacitor provides the control voltage. The charging circuit is operable to charge the capacitor based on the comparison signal. The discharging circuit is operable to discharge the capacitor based on the comparison signal.

Abstract: A tripolar VSC-HVDC system and method include a rectifier and an inverter formed by a three-phase six-bridge arms modular multilevel converter (MMC) respectively, and two converter valves are arranged on the DC side of the rectifier and inverter respectively. The midpoint of upper and lower converter valves of the rectifier and inverter are connected with a pole 3 DC line by a smoothing reactor. Triggering of the upper and lower converter valves is controlled to change the DC voltage polarity of the pole 3 periodically, and tripolar DC transmission is realized by modulating current orders of the three poles.