Abstract: The invention is related to a method of initiating a regenerative converter (1) and corresponding converter (1) including a line bridge (2) and a machine bridge (3), which are interconnected via a DC intermediate circuit (8A, 8B). The method comprises charging, through the line bridge (2) and while the machine bridge (3) remains inactive, the DC intermediate circuit (8A, 8B) to a target voltage (14) higher than peak value of the mains voltage (13).

Abstract: A switching power supply device includes a switching transistor, a sense resistor, a transformer, an optocoupler, and a current limiting feedback circuit. The switching transistor is controlled to be turned on and turned off. The sense resistor is configured to generate a sense voltage when the switching transistor is turned-on. The transformer includes a primary winding to which an input voltage is applied when the switching transistor is turned-on, a secondary winding is configured to supply an output voltage to a load, and an auxiliary winding that is configured to detect the output voltage. The optocoupler is configured to generate first and second optocoupler currents corresponding to the output voltage. The current limiting feedback circuit is configured to generate first, second, and third feedback currents using a voltage of the auxiliary winding, the first, second, and third feedback currents being in inverse proportion to the output voltage.

Abstract: A COT control circuit used for realizing current sharing in multi-phase DC-DC converter. The multi-phase DC-DC converter has N switching circuits, N controllers, and a trimming current generator receiving N switching voltage signals of the N switching circuits to generate N trimming current signals. The N trimming current signals are respectively sent to the N controllers to regulate on time of at least one controllable switch of each of the N switching circuits so as to finally realize current sharing in the multi-phase circuits.

Abstract: Provided is a power supply apparatus, which is capable of saving power at the time of low output power even in a configuration using an inrush current prevention resistor and a switch as an inrush current prevention circuit in order to increase power of a low power supply. An AC/DC power supply includes a rectifier configured to rectify an input AC voltage, a smoothing capacitor configured to smooth the rectified voltage, a resistor configured to limit an inrush current input to the smoothing capacitor, a relay configured to control whether to input a current to the resistor, and a current detection circuit. The AC/DC power supply further includes a converter connected at the subsequent stage of the smoothing capacitor and configured to adjust the voltage smoothed by the smoothing capacitor to a predetermined voltage.

Abstract: A power conversion apparatus including a transformer, a power switch, a pulse width modulation (PWM) signal generator, an energy storage element, and a power circuit is provided. A primary winding of the transformer receives an input voltage from an external power source. An auxiliary winding of the transformer provides an auxiliary voltage. The power switch is coupled to the primary winding. The PWM signal generator generates a PWM signal to control on and off the power switch. The energy storage element is coupled to a power terminal of the PWM signal generator. The power circuit supplies power to the PWM signal generator and charges the energy storage element according to the auxiliary voltage. When a voltage of the energy storage element is greater than or equal to a threshold voltage, the power circuit stores backup power according to the auxiliary voltage.

Abstract: An integrated circuit includes a voltage reference circuit including a Zener diode having a first terminal coupled to a first node and a second terminal coupled to a first voltage supply terminal. A proportional to absolute temperature (PTAT) circuit is coupled at the first node and configured to generate a PTAT current. A PTAT compensation circuit is coupled at the first node. The PTAT compensation circuit includes a first current mirror having a first branch coupled at the first node.

Abstract: A voltage regulator has a switching circuit and a control circuit. The switching circuit provides an output voltage and an output current. The control circuit provides a switching control signal to the switching circuit to adjust the output voltage, such that the output voltage decreases with a first slope as the output current increases when the output current is less than a predetermined current, the output voltage decreases with a second slope as the output current increases when the output current is larger than the predetermined current.

Abstract: A device [200] is configured to detect a zero voltage switching (ZVS) circuit [110] output that includes a hard switching signal. The hard switching signal [114] includes a false signal [116] and a spike signal [118]. Thereafter, the device generates digital pulse signals [312/314] that correspond to the false signal and the spike signal. Accordingly, the device filters the generated digital pulse signal that corresponds to the false signal [312], and uses the digital pulse signal [314] that corresponds to the spike signal for adjusting a timing [132] of a pulse width modulation (PWM) switching cycle [Vgs ].

Abstract: A method operates an inverter by driving respective switching means of the bridge arms using pulse width modulation with a temporally changeable duty cycle such that voltages between the bridge connections have a temporally predefined profile. The respective switching means of the bridge arms are driven with flat-top modulation for particular angular ranges of a respective fundamental oscillation. A respective duty cycle for the respective switching means of the bridge arms is selected such that, during a respective period of the pulse width modulation, at least two shunt resistors always perform their measurement function for a minimum time.

Abstract: A method operates an inverter, wherein the inverter includes a number of bridge arms with respective bridge terminals, wherein a respective bridge arm is electrically connected on a first side to a first intermediate circuit pole of the inverter, and wherein a respective bridge arm is electrically connected on a second side to a second intermediate circuit pole of the inverter. A respective bridge arm has at least two switching elements, wherein a respective bridge terminal, depending upon a circuit state of the switching elements in the bridge arm, is electrically connected either to the first intermediate circuit pole or to the second intermediate circuit pole. A shunt resistor is arranged in a respective bridge arm. The method actuates the respective switching elements of the bridge arms via pulse width modulation with a temporally variable pulse duty factor, such that voltages between the bridge terminals show a temporally defined characteristic.

Abstract: Generally speaking, a pulse generation unit can aid load transient response for a DC-to-DC converter. In some examples, a pulse generation unit is coupled to an output voltage of the DC-to-DC converter. The pulse generation unit includes a transient sensing unit and a clock augmentation unit. The transient sensing unit monitors the output of the DC-to-DC converter. When the transient sensing unit detects a load transient, the transient sensing unit generates an additional clock pulse. The clock augmentation unit augments an existing clock signal to include the additional clock pulse.

Abstract: A controller IC has, for example, a current detection terminal for detecting a coil current passing in a switching power supply and an on-timing setter configured to check for a ground short circuit at the current detection terminal when an output transistor turns off to generate an on-timing setting signal so as to turn on the output transistor, during normal operation, at the time point that the coil current has decreased to a zero value or a value close thereto and, during a ground short circuit, after the lapse of a predetermined minimum off-period.

Abstract: Methods, systems, and apparatus to facilitate current sensing for valley current-controlled power converters are disclosed. An example apparatus includes a comparator including a first terminal, a second terminal, and an output. The apparatus further includes a first transistor including a first drain coupled to the first terminal of the comparator. The apparatus further includes a second transistor including a second drain coupled to the first terminal of the comparator. The apparatus further includes a third transistor including a third drain coupled to the second terminal of the comparator.

Abstract: A bidirectional switch and a method of the bidirectional switch including, a first enhancement mode n-channel metal oxide semiconductor field effect transistor (n-MOSFET) and a second n-MOSFET electrically connected in a common source configuration. The emitter of an insulated gate bipolar transistor (IGBT) is further electrically connected to the common sources of the n-MOSFET. A control board regulates a first operation of the IGBT and an operation of the first field effect transistor. The control board additionally receives at least one measured characteristic, from a sensor and determines the measured characteristic is below a predetermined threshold. The control board then regulates an operation of the second field effect transistor and a second operation of the IGBT.

Abstract: An electronic protection device for a LV electric line, the protection device being provided with a control unit comprising a controller including digital data processing resources clocked by a first clock source adapted to provide a first flock signal with a first nominal clock frequency. The control unit comprises a clock testing arrangement adapted to check whether the first clock source is properly operating.

Abstract: A power controller provides a PWM signal to a power switch in response to a compensation signal to control the power switch, the compensation signal generated in response to an output voltage of a power converter. The power controller is configured to provide a maximum switching frequency limiting a switching frequency of the PWM signal. The power controller jitters the maximum switching frequency, making the maximum switching frequency have a first average switching frequency and a first variation ratio when the compensation signal is a first compensation value, and have a second average switching frequency and a second variation ratio when the compensation signal is a second compensation value. The first average switching frequency is higher than the second average switching frequency, and the second variation ratio is larger than the first variation ratio.

Abstract: A transient response enhancement circuit for buck-type voltage converters, wherein, the transient load changing detecting module detects the output voltage of the buck-type voltage converter. The first control signal is generated when the increase of the output voltage is detected, and the second control signal is generated when the decrease of the output voltage is detected, thereby self-adaptively detecting the time of the buck-type voltage converter in response to the load changing. The compensation voltage predicting operation module predicts and adjusts the compensation voltage and the adjusted compensation voltage is superimposed on the buck-type voltage converter through the internal active compensation module to adjust the duty ratio of the buck-type voltage converter. The drive controlling insertion logic module can further improve the response speed.

Abstract: A power converter circuit that includes a switch node coupled to a regulated power supply node via an inductor may, during a charge cycle, source current to the switch node, and source a bypass current to the regulated power supply node using a regulator control signal. A control circuit may initiate the charge cycle using a first reference voltage level and a sensed inductor current, and generate the regulator control signal using a second reference voltage level and a voltage level of the regulated power supply node.

Abstract: A modular multilevel voltage source converter and a method and computer program product for handling circulating currents in such a modular multilevel voltage source converter are described. A control unit of the voltage source converter determines a circulating current control signal contribution (ER1?ER2+2VCM) for a phase leg based on the sum of cell voltages in the upper phase arm of the phase leg, the sum of cell voltages in the lower phase arm of the phase leg and at least one modulation reference and combines the circulating control signal contribution with a modulation reference used for one of the phase arms in order to obtain a modified voltage reference for controlling the phase arm to handle a circulating current while a waveshape is formed.

Abstract: An apparatus for controlling a switching power supply during burst control that includes a switching period and a no switching period. The switching power supply includes first and second switching elements and a resonance circuit. The control apparatus includes a load detecting circuit that shunts and averages a resonance current of the resonance circuit, an off signal generating circuit that generates off signals for turning off the first and second switching elements during the switching period, an on signal generating circuit that obtains a number of resonance cycles of the ringing voltage in the no switching period and generates a first pulse on signal for turning on the second switching element to restart the switching period, and a control circuit that receives the off signals and the first pulse on signal, and generates first and second control signals for alternating on-off control of the first and second switching elements.