Abstract: A power converter determines a feedback signal according to a voltage signal related to an output voltage of the power converter and a reference voltage, thereby regulating the output voltage. A control circuit and method for programming the output voltage of the power converter utilize an offset current generator to inject a current or sink a current for changing the voltage signal or the reference signal, thereby adjusting the output voltage. As a result, it gets rid of complicated circuitry but provides more steps adjustment, which reduces related costs.

Abstract: The described embodiments include an apparatus that controls voltages for an integrated circuit chip having a set of circuits. The apparatus includes a switching voltage regulator separate from the integrated circuit chip and two or more low dropout (LDO) regulators fabricated on the integrated circuit chip. The switching voltage regulator provides an output voltage that is received as an input voltage by each of the two or more LDO regulators, and each of the two or more LDO regulators provides a local output voltage, each local output voltage received as a local input voltage by a different subset of the circuits in the set of circuits. During operation, a controller sets an operating point for each of the subsets of circuits based on a combined power efficiency for the subsets of the circuits and the LDO regulators, each operating point including a corresponding frequency and voltage.

Abstract: In one embodiment, a control circuit can include: a voltage feedback circuit configured to obtain a voltage feedback signal that represents an output voltage of the power stage circuit; a set signal generator configured to output a set signal when a secondary current crosses zero or a voltage sampling signal reaches a valley value; a reset signal generator configured to output a reset signal in a constant on time mode when the voltage feedback signal is greater than a first voltage threshold value, and to output the reset signal in a peak current mode when the voltage feedback signal is less than the first voltage threshold value; and a logic circuit configured to activate a switching control signal according to the set signal, and to deactivate the switching control signal according to the reset signal.

Abstract: The present invention discloses a modulation method for a three-phase multilevel converter. The modulation method comprises the following steps: generating first three-phase sinusoidal modulated wave signals by a control loop in the three-phase multilevel converter; generating second three-phase modulated wave signals by processing the first three-phase sinusoidal modulated wave signals, wherein in proximity to peak values of a line voltage of the second three-phase modulated wave signals, absolute values of any two phases are unequal; generating PWM pulse signals based on the second three-phase modulated wave signals; and generating driving signals for respective power units in the three-phase multilevel converter based on the PWM pulse signals.

Abstract: An apparatus for delivering power to a load, which comprises an isolated power converter that converts input power on a primary side to output power and a supply voltage at a node on a secondary side. On the secondary side, a load switch is located on a current path to the load. A secondary-side control circuitry controls the load switch to operate in an ON mode in which current is provided to the load, and in response to a fault condition corresponding to an effective sudden disconnection of the supply voltage, switches the load switch into an OFF mode in which the current path to the load is blocked.

Abstract: Two transistors are connected between a power source and separate current references. The base of the first transistor is connected to a bias voltage, and the base of the second transistor is connected to the output of a differential amplifier. The amplifier inputs are connected to the nodes where the transistors are connected to the current references. The transistors and the current references may be of different sizes, such that the output voltage of the amplifier is a function of temperature and of the product of the ratios of the transistors and the current references. A number of switches may be employed such that, in alternative modes of operation, the amplifier is used to buffer the bias voltage, the offset of the amplifier, the output of the first transistor, and/or a stored sample of the temperature output voltage, which are combined to arrive at an adjusted temperature reading.

Abstract: A power electronic arrangement has a power converter module, and a first and a second DC voltage terminal element and a first and a second DC voltage connection element, connected to conductor tracks in an electrically conductive manner with the correct polarity. First and second DC voltage terminal element, and the first and second DC voltage connection element, form a stack with an insulation device therebetween. The first DC voltage terminal element has a first recess enclosed in a first main plane, the second DC voltage connection element has a second recess enclosed and aligned with the first in a third main plane, the second DC voltage terminal element and the first DC voltage connection element are in a second main plane between the first and third main plane, and are laterally spaced from each other proximate the recesses.

Abstract: Transformerless bimodal inverters provide grid-tie outputs for back-feeding solar-originated power from a battery to a utility power grid in a grid-tied mode, simultaneously or alternatively with providing a constant-voltage AC output for powering AC appliances or loads directly in a standalone mode. The inverters continue to operate in the standalone mode without interruption should the grid-tied mode cease, e.g., due to anti-islanding during a grid outage or other fault condition not affecting the standalone mode. Conversely, the inverters continue to operate in the grid-tied mode should the standalone mode trip out, e.g., due to a current overload or other condition not affecting the grid-tied mode.

Abstract: A method of putting a converter module of a cascade converter system into operation, wherein the cascade converter system includes: n converter modules; n bypass switch modules; and a system controller, wherein the method includes: a module pre-plug-in step: m bypass switch modules of the n bypass switch modules being in a non-bypass state, and remaining n-m bypass switch modules being in a bypass state, the system controller communicating with the module controllers of the m converter modules, such that the m converter modules operate according to a first control signal, wherein 1?m<n; a module plug-in step: the system controller controls the (m+1)th bypass switch module to change from the bypass state to the non-bypass state; and a module post-plug-in step: the system controller communicating with the module controllers of the m+1 converter modules, such that the m+1 converter modules operate according to a second control signal.

Abstract: An adaptive valley mode switching power converter is provided that switches on a power switch within valley periods of a resonant voltage oscillation for the power switch. Each valley period is determined with regard to a valley threshold voltage.

Abstract: Methods and systems for implementing a closed loop DC-DC converter utilize a compensator to stabilize the output voltage of the DC-DC converter while improving the loop gain in the band of interest. A compensator may be implemented by an operational amplifier and a feedback circuit. The operational amplifier may be configured to receive a fraction of sensed output voltage at the non-inverting terminal and compare the sensed output voltage with the voltage received at the inverting terminal to generate an error signal which is used to determine the duty cycle of a pulse-width modulated signal.

Abstract: A switching power conversion circuit includes a pre-regulator circuit that is operated in buck, boost, or bypass mode and that includes a first switching circuit that receives an input DC voltage and outputs a first DC voltage; a resonant circuit including a second switching circuit that receives the first DC voltage and outputs an output DC voltage; a resonant control circuit that regulates the output DC voltage by transmitting a link min set control signal and a link max set control signal and by controlling a switching frequency of the second switching circuit; and a pre-regulator control circuit that receives the link min set control signal and the link max set control signal and that controls the first switching circuit based on the link min set control signal and the link max set control signal to regulate the first DC voltage.

Abstract: An inverter includes: a converter circuitry to convert an alternating-current voltage to a direct-current voltage; an inverter circuitry to convert a direct-current voltage obtained by conversion by the converter circuitry to an alternating-current voltage and to supply the alternating-current voltage obtained by conversion to a load; a current detector to detect an output current of the inverter circuitry; a calculator to calculate an output frequency based on the output current detected by the current detector, and a pulse-signal outputter to output a pulse signal based on the output frequency calculated by the calculator. The inverter circuitry converts the direct-current voltage obtained by conversion by the converter circuitry to the alternating-current voltage based on the pulse signal output from the pulse-signal outputter, so as to obtain a frequency corresponding to the magnitude of the load.

Abstract: System and apparatus for power conversion. In one embodiment, the apparatus comprising a DC stage, comprising a resonant circuit, for generating a high-frequency resonant current; and an AC stage for converting a high-frequency current, generated from the high-frequency resonant current, to an AC output current, wherein the AC stage comprises: a pair of serially-connected switches for (i) passing, during a first half of a cycle of an AC line, a positive portion of the high-frequency current, and (ii) passing, during a second half of the cycle of the AC line, a negative portion of the high-frequency current; and an unfurling bridge for unfurling a current waveform, formed from the positive and the negative portions, to generate the AC output current, wherein the unfurling bridge is operated at a frequency on the order of three orders of magnitude lower than an operating frequency of the serially-connected switches.

Abstract: A static synchronous compensator includes at least one converter pole for producing a first phase of an AC voltage waveform having a fundamental cycle. The first phase of the AC voltage waveform includes alternating converter pole charging and discharging regions in each fundamental cycle. The at least one converter pole includes a plurality of cascaded H-bridge cells, each having a DC voltage source and a plurality of switches. The switches are capable of being switched to produce a plurality of switching states. There is a controller configured to control the switching states of the plurality of switches of each of the cascaded H-bridge cells based on the voltages of DC voltage sources of the H-bridge cells and on whether the AC waveform is in the converter pole charging region or the converter pole discharging region.

Abstract: A resonant converter includes: a rectifier bridge; a first capacitor coupled across output terminals of the rectifier bridge; a diode with its anode coupled to a first terminal of the first capacitor; a second capacitor with a first terminal coupled to the cathode of the diode, and a second terminal coupled to a second terminal of the first capacitor; a first transistor having a first terminal coupled to the first terminal of the second capacitor; a second transistor having a first terminal coupled to a second terminal of the first transistor, and a second terminal coupled to the second terminal of the first capacitor; a resonant tank having a first input terminal coupled to the first terminal of the first capacitor, and a second input terminal coupled to the second terminal of the first transistor and the first terminal of the second transistor; and a rectifying and filtering circuit coupled across output terminals of the resonant tank, and configured to provide an output signal to a load.

Abstract: A switching power converter may include a power switch coupled to a primary winding of a transformer, and a primary controller configured to turn on and off the power switch, a synchronous rectifier switch coupled to a secondary winding of a transformer, and a synchronous rectifier controller configured to turn on and off the synchronous rectifier switch. The synchronous rectifier controller may monitor a voltage across the synchronous rectifier switch. The synchronous rectifier controller may determine a period of a resonant oscillation of the voltage across the synchronous rectifier switch following at least one cycling off of the synchronous rectifier switch. The synchronous rectifier controller may adjust the minimum off-time period for the synchronous rectifier switch based on the period of the resonant oscillation. The synchronous rectifier controller may adaptively adjust a minimum off-time period for the synchronous rectifier switch.

Abstract: An alternating current power supply configured to provide a high-voltage alternating current power output from two low-voltage alternating current power sources is provided. The alternating current power supply comprises a first alternating current power input, a second alternating current power input, and an alternating current power output having a first output conductor and a second output conductor. The alternating current power supply includes a first switch means for coupling the first alternating current input to the first output connector and the second alternating current input to the second output connector. The first switch means is sequentially responsive to the first current flow followed by the second current flow. The alternating current power supply further comprises an isolation means connected between the first switch means and the alternating current power output, wherein the isolation means is configured to isolate the first current flow from the second current flow.

Abstract: Various systems, apparatuses, and methods are disclosed herein, which provide a new power conversion topology for isolated systems that does not include a transformer. Embodiments of the inventive systems comprise: a switching system utilizing high voltage, low leakage switches, e.g., Silicon Carbide (SiC) MOS-FETs; a power source; an inductor and a capacitor operating as a link stage resonant LC circuit; and a load. The switching system may be configured to be controlled in a synchronized ‘four phase’ control loop process, wherein the input switches are prevented from being closed at the same time as the output switches, thereby providing electrical isolation between the input power source and the load—without the use of a transformer. The techniques disclosed herein are applicable to any number of isolated systems that supply power to electronic systems such as: digital cameras, mobile phones, watches, personal data assistants (PDAs), portable music players, displays, and computers.

Abstract: A voltage regulator includes a first transistor including a first terminal to receive an input voltage and a second transistor including a first terminal coupled to a second terminal of the first transistor. A charge pump couples to the second transistor and to an output voltage node. An amplifier receives a feedback voltage derived from the output voltage and generates a control signal to gates of the transistors. Responsive to the input voltage being more than a threshold larger than the output voltage, the amplifier maintains the second transistor off and the first transistor on such that current flows through the first transistor to the output voltage node but not the second transistor. Responsive to the input voltage being less than the threshold amount, the amplifier operates the first transistor in a triode mode and turns on the second transistor to provide current to the charge pump.