Abstract: Disclosed are a Darlington transistor drive circuit, a Darlington transistor drive method implemented based on such Darlington transistor drive circuit, and a constant current switching power supply including such Darlington transistor drive circuit. The Darlington transistor drive circuit includes a drive current circuit, two switch units, and a drive control circuit used for controlling the two switch units to be switched off during the switching-on cycle of the Darlington transistor and to be switched on during a switching-off cycle of the Darlington transistor, and for changing an equivalent resistance of the two switch units at different stages during the switching- off cycle of the Darlington transistor. The switching-off time delay of the Darlington transistor is greatly reduced while achieving the EMI optimization. In additional, the switch loss of Darlington transistor is small when it is switched off, and the efficiency is improved.

Abstract: A voltage transforming device is provided. The voltage transforming device boosts an input voltage to generate a boosted voltage in response to a voltage demand from an external device. The voltage transforming device converts the boosted voltage to provide a converted voltage based on a fixed gain condition. In addition, the voltage transforming device converts the converted voltage to provide an output voltage in response to the voltage demand.

Abstract: A direct current/alternating current (DC/AC) inverter system includes a primary DC-DC converter that receives an input DC voltage and a secondary DC/AC inverter. The primary DC-DC converter includes a plurality of switching networks and a plurality of transformers having a plurality of primary windings and a plurality of secondary windings. Characteristically, the plurality of secondary windings is arranged in series to provide a first output and a second output. A resonant LC circuit is connected in series with the first output and the second output. A rectifier rectifies an AC voltage between the first output and the second output to form a first rectified output. The secondary DC/AC inverter receives the first rectified output or filtered output thereof and provides a high voltage AC output. A controller mediates switching of the plurality of switching networks.

Abstract: Disclose is a wireless electric energy transmission system for realizing PFC through secondary side modulation. According to the system, on the basis of a traditional wireless charging system topology, a traditional PFC circuit is removed, a grid voltage is turned into a 100 Hz voltage through uncontrolled rectification to directly supply power to an inverter of a primary side of a wireless charging system; an active full-bridge rectifying structure is adopted at a secondary side, and the PFC function is achieved only through secondary side modulation, wherein under the situation that a phase shift angle ? of the inverter of the primary side is given.

Abstract: In a High Efficient and Reliable Inverter Concept power conversion device, control is performed with one cycle divided into four periods, wherein in a first period when the signs of an AC voltage and an AC current are both positive, first and fourth switches perform switching operation, second and third switches are opened, and a sixth switch is closed; in a second period when the signs are positive and negative, a current is passed through freewheeling diodes when a fifth switch is opened while the fifth switch performs switching operation; in a third period when both signs are negative, the second and third switches perform switching operation, the first and fourth switches are opened, and the fifth switch is closed; and in a fourth period when the signs are negative and positive, a current is passed through freewheeling diodes when the sixth switch is opened while the sixth switch performs switching operation.

Abstract: Systems for operating a rectifier are provided. Aspects include a rectifier including a set of bridge structures configured to receive an input current of a power supply, wherein each bridge structure in the set of bridge structures includes a set of diodes and a set of active switches, wherein each active switch in the set of active switches is configured to provide a parallel path around each diode in the set of diodes when in a PWM state, a controller configure to determine a threshold current for the rectifier and operate one or more active switches in the rectifier in a PWM state based on the input current being less than the threshold current.

Abstract: A pulse width modulation (PWM) interleaving system is provided. The PWM interleaving system includes active harmonic filters (AHFs). The AHFs are disposed in parallel with each other and with a load. The AHFs are electrically coupled to a common coupling point that is electrically interposed between a grid and the load. The AHFs are configured to affect, by PWM, a characteristic of current flowing between the grid and the load. The PWM interleaving system further includes a controller operably coupled to the AHFs and configured to synchronize the PWMs of the AHFs to thereby cancel ripple currents propagating towards the grid.

Abstract: The present disclosure provides an isolated multi-phase DC/DC converter with a reduced quantity of blocking capacitors. In one aspect, the converter includes a multi-phase transformer having a primary circuit and a secondary circuit magnetically coupled to the primary circuit, the primary circuit having a first quantity of terminals, and the secondary circuit having a second quantity of terminals; a third quantity of blocking capacitors, each being electrically connected in series to a respective one of the terminals of the primary circuit; and a fourth quantity of blocking capacitors, each being electrically connected in series to a respective one of the terminals of the secondary circuit. The third quantity is one less than the first quantity. The fourth quantity is one less than the second quantity.

Abstract: A converter network bridge controller for a power converter hardware being connectable to an alternating current electricity network is provided. The controller includes an output unit configured for generating a quadrature voltage component reference to a PWM modulator which determines the switching of the power converter hardware, wherein the quadrature voltage component reference includes a first signal and a second signal. The output unit includes a first part and a second part. The first part is configured for generating the first signal based on a current reference for an active current to be generated by the power converter hardware. The second part is configured for providing the second signal to reduce a difference between a converter active current component of measured feedback current and the current reference for active current.

Abstract: A current mirror circuit includes a first current mirror transistor, a second current mirror transistor, and a bias circuit. The first current mirror transistor includes a gate and a drain. The second current mirror transistor includes a gate coupled to the gate of the first current mirror transistor. The first current mirror transistor and the second current mirror transistor are low threshold voltage transistors. The bias circuit is coupled to the gate and the drain of the first current mirror transistor. The bias circuit is configured to bias the first current mirror transistor to operate in a saturation mode when a threshold voltage of the first current mirror transistor is a negative voltage.

Abstract: An energy recycle circuit for a flyback circuit, the flyback circuit has a primary winding of a transformer a primary switch. The energy recycle circuit has an energy recycle branch coupled in parallel with the primary winding, and an integrated circuit having a plurality of pins. The energy recycle branch has an auxiliary switch and a clamp capacitor connected in series. Among the plurality of pins, a first pin receives an external supply voltage. A second pin is used as a power ground that is different from a primary power ground. A third pin is used to sense a branch current flowing through the energy recycle branch. A fourth pin is used to control an operation of the auxiliary switch. A fifth pin that is connected to an external resistor for setting a maximum ON-time threshold of the auxiliary switch.

Abstract: First and second n-channel FETs are connected in series between first and second terminals with an intermediate switching node. First and second driver circuits drive gates of the first and second n-channel FETs, respectively, in response to drive signals. The first driver circuit does not implement slew-rate control. A first resistor and capacitor are connected in series between the output of the first driver circuit and an intermediate node. A first electronic switch is connected between the intermediate node and the first terminal. A second electronic switch is connected between the intermediate node and the gate terminal of the first n-channel FET. A second resistor and a third electronic switch are connected in series between the gate terminal of the first n-channel FET and the switching node. A control circuit generates the drive signals and a first, second and third control signal for the first, second and third electronic switch.

Abstract: An inverter performs a power conversion operation for converting DC power into AC power, includes an arithmetic control device provided with a voltage command signal generation unit, a synthesis processing unit, and a carrier wave comparison unit. The voltage command signal generation unit has a plurality of control systems, and outputs the first voltage command signal generated based on the first control system among the plurality of control systems, and the second voltage command signal generated based on the second control system different from the first control system among the plurality of control systems. The synthesis processing unit generates a synthesized voltage command signal obtained by synthesizing the first voltage command signal and the second voltage command signal at a predetermined ratio. The carrier wave comparison unit generates a PWM signal which is a gate drive signal for controlling the power conversion operation based on the synthesized voltage command signal.

Abstract: A phase balancer includes a plurality of power conversion circuits, a direct current transformer, and a plurality of phase-nodes. Each of the power conversion circuits may include a throughput, a capacitor bank, and a direct current bus. The direct current transformer may be coupled to each of the direct current buses to move energy between the power conversion circuits. Each throughput may be operatively coupled to the capacitor bank of one power conversion circuit and the throughput of another power conversion circuit to move current between the plurality of power conversion circuits.

Abstract: A converter assembly has a converter with multiple converter valves, each with a plurality of semiconductor switches, and with a stored energy source branch which is connected in parallel with at least one of the converter valves. The stored energy source branch has voltage converter modules and stored energy source modules. The voltage converter modules are connected to one another in a series circuit on the input side and to the respectively associated stored energy source module on the output side. There is also described an assembly having the stored energy source branch and a method for stabilizing an alternating current system by way of the converter assembly.

Abstract: A method for operating switching elements of a multilevel energy converter using at least three electric potentials and to which a multiphase electrical machine is connected. Switching elements of the multilevel energy converter are operated in a predefined clock mode by corresponding switching signals. The switching signals for the switching elements are each assigned to one of the phases and are determined in accordance with each desired voltage signal, in order to apply a phase voltage to each phase of the multiphase electrical machine. The switching signals are determined additionally in accordance with a predefined overlaying voltage signal such that an overlaying voltage dependent on the overlaying voltage signal is overlaid onto each phase voltage.

Abstract: The present document relates to power converters with multiple feedback loops. The present document relates to a power converter with at least two feedback loops. The power converter may include a first error amplifier configured to generate a first error signal based on a first reference signal and a first feedback signal. The power converter may include a second error amplifier configured to generate a second error signal based on a second reference signal and a second feedback signal. The power converter may include a selector circuit configured to generate a selection signal by selecting the first error signal or the second error signal. The power converter may include a first clamp circuit configured to limit the first error signal to a first threshold value. The power converter may include a first threshold value generator circuit configured to generate the first threshold value dependent on the first error signal.

Abstract: A power converter with secondary side active clamp. At least one example is a method including: limiting a push-phase voltage excursion of a phase node on a secondary side of a power converter during a push phase of a primary side of the power converter, the limiting by extracting current from the phase node and storing the current on a clamp capacitor; limiting a pull-phase voltage excursion of the phase node on the secondary side of the power converter during a pull phase of the primary side of the power converter, the limiting by extracting current from the phase node and storing the current on a clamp capacitor; and utilizing the current stored on the clamp capacitor to drive a component on the secondary side.

Abstract: A series multiplex inverter includes a power conversion unit, a phase difference selection unit, a drive signal generation unit, and a drive signal output unit. The phase difference selection unit selects, from among a plurality of phase difference candidates, the phase difference between rectangular wave voltages from a plurality of single-phase inverters. The drive signal generation unit generates a plurality of drive signals that causes the different single-phase inverters to output a plurality of rectangular wave voltages sequentially out of phase by the phase difference selected by the phase difference selection unit. The drive signal output unit outputs the plurality of drive signals generated by the drive signal generation unit to the plurality of single-phase inverters.

Abstract: The present disclosure provides a control method for an AC-DC conversion circuit. The method includes: calculating working information of an AC-DC conversion circuit according to at least one circuit parameter information of an input voltage, an input current, an output voltage, and an output current of the AC-DC conversion circuit; comparing the working information of the AC-DC conversion circuit with a preset working range to obtain an actual switching frequency or an actual switching period of the AC-DC conversion circuit. The AC-DC conversion circuit can meet requirements of Total Harmonic Distortion (THD), Power Factor (PF), efficiency and Electromagnetic Interference (EMI) and the like by adjusting the working information of the AC-DC conversion circuit through the preset working range.