Abstract: The present invention provides a Pulse Width Modulation (PWM) method for a Cascaded H-bridge (CHB) converter. Each phase of the converter is provided with n Cascaded H-bridge rectifier circuits, or may also be provided with n Cascaded H-bridge rectifier circuits+1 redundant H-bridge rectifier circuit. The method includes following steps of: S1, generating groups of sinusoidal signals as reference waveforms, and generating n carrier signals having sequentially decreasing levels and equal amplitudes to correspond to the H-bridge rectifier circuit at the first to the nth levels, where the levels of the n carrier signals are cascaded to fill the voltage amplitude of a unipolar half cycle of the reference waveform; and S2, determining PWM signals for controlling power transistors of the corresponding H-bridge rectifier circuits based on each reference waveform and each carrier signal.

Abstract: A power conversion circuit includes a first terminal, a second terminal, a first switching conversion unit, a second switching conversion unit, a flying capacitor and a magnetic element. The first switching conversion unit includes a first switch and a third switch. The second switching conversion unit includes a second switch and a fourth switch. The magnetic element includes two first windings and a second winding. A first one of the two first windings is serially connected between the flying capacitor and the second terminal. A second one of the two first windings is serially connected between the second switch and the second terminal. The second winding is serially connected with the flying capacitor and the first one of the two first windings. A turn ratio between the second winding, the first one of the two first windings and the second one of the two first windings is N:1:1.

Abstract: A switching device for opening a current path of a direct-voltage network, which current path has source-side and load-side inductors, the switching device includes at least two switching modules, which are connected in series, each of the switching modules having at least one controllable semiconductor switching element, in parallel with which a series circuit of a resistor and a capacitor is connected. During operation of the switching device in order to open the current path, the controllable semiconductor switching element of at least one of the switching modules is switched into a conductive state with a duty cycle until the energy stored in the inductors has been dissipated, the duty cycle being dependent on the difference between the actual voltage and a target voltage across the semiconductor switching element, the target voltage being calculated at least from the system voltage of the direct-voltage network and the number of switching modules.

Abstract: A radio frequency (RF) device and a voltage generation and harmonic suppressor thereof are provided. The RF device includes the voltage generation and harmonic suppressor and a RF circuit. The voltage generation and harmonic suppressor is configured to receive a RF signal to output at least one direct current (DC) voltage related to the RF signal, and configured to suppress a harmonic generated by the RF signal in the voltage generation and harmonic suppressor. The RF circuit is configured to receive the RF signal, and configured to perform an operation according to the at least one DC voltage.

Abstract: The present invention provides a control device for an isolated converter, including a comparison module, which receives a load percentage of the isolated converter, compares the load percentage with a first preset threshold and a second preset threshold, and outputs a comparison result; and an adjustment module, which receives the comparison result and adjusts a switching frequency of a switching transistor of the isolated converter based on the comparison result, wherein when the load percentage is not greater than the first preset threshold value, the switching frequency is set to a first frequency value to prevent magnetic saturation of a transformer of the isolated converter, and when the load percentage is greater than the second preset threshold value and in a stable state, the switching frequency is set to a second frequency value, so that the temperature of the isolated converter does not exceed the maximum allowable temperature, wherein the first preset threshold is less than or equal to the second

Abstract: A method is disclosed for operating a technical apparatus with an electronic converter controlled a control signal. A control signal profile is provided with which the electronic converter is to be operated. A predicted control signal profile is predicted based on the provided control signal profile. The predicted control signal profile is a predicted future profile of the control signal. A modified control signal profile of is obtained by modifying the provided control signal profile using a trainable, data-based control signal model. The control signal model is trained to determine the modified control signal profile based on the provided control signal profile and the predicted control signal profile. The electronic converter is operated using the modified control signal profile.

Abstract: A system and method for an isolation transformer boost system. The system includes an isolation transformer, a sensor, and an electronic processor coupled to the sensor. The electronic processor configured to receive an electrical characteristic measurement from the sensor, compare the electrical characteristic measurement to a predetermined threshold, and activate an electrical characteristic boost when the electrical characteristic measurement is below the predetermined threshold.

Abstract: A switching power supply device includes first to fourth switches sequentially connected in series, an inductor, a first capacitor whose first end is connected to a connection node of the first switch and the second switch and whose second end is connected to a connection node of the third switch, the fourth switch, and the inductor, a second capacitor whose first end is connected to a connection node of the second switch and the third switch, and a controller that controls switching on and off of the first to fourth switches. In at least one of a first pair configured with the first switch and the third switch and a second pair configured with the second switch and the fourth switch, the controller shifts a timing of switching from off to on between two switches.

Abstract: A power converter includes a circuit board, a first magnetic core, and a housing. The circuit board includes an insulating substrate and a first coil conductor. The insulating substrate includes a first side surface. The first magnetic core includes a first magnetic core member and a second magnetic core member. A first side surface of the insulating substrate is opposed to a first portion of the housing and is spaced away from the first portion of the housing. The first magnetic core member and the second magnetic core member are both thermally connected to the first portion.

Abstract: The invention provides a switching power supply and an electronic device, comprising an active clamp circuit and a transformer, the active clamp circuit including a first clamp capacitor, a second clamp capacitor, and a path guiding module that is connected at two terminals of the first clamp capacitor and two terminals of the second clamp capacitor respectively; the path guiding module, the first and the second clamp capacitors are all directly or indirectly connected to a primary side of the transformer; the path guiding module is configured to guide the first and the second clamp capacitors to obtain an electric energy from different positions on the primary side of the transformer in a first time period, and to guide the first and the second clamp capacitors to discharge the primary side of the transformer after being connected in parallel with each other in a second time period.

Abstract: A method of measuring an AC input voltage at an input of a power converter includes measuring a DC bus voltage corresponding to the power converter. During a positive half-cycle of the AC input voltage, the method includes measuring a first voltage at the input of the power converter. During a negative half-cycle of the AC input voltage, the method includes turning on a high-side switch, measuring a second voltage at the input of the power converter, and computing a third voltage equal to the second voltage minus the DC bus voltage. The method further includes providing the AC input voltage as the first voltage during the positive AC half-cycle and the third voltage during the negative AC half-cycle.

Abstract: A synchronous average harmonic current controller for a bidirectional resonant power converter provides efficient load invariant voltage gain. The controller includes a switched capacitor filter which averages and compensates a current signal over each half of the synchronous switching period. The control signal encodes an independent modulated phase and non-modulated differential duty cycle error response. The error response signals provide negative feedback to a pulse width modulation stage which results in reduction of the synchronous average harmonic current. At this operating point, the harmonic voltage gain is related closely to the commanded bridge duty cycles.

Abstract: A voltage selector circuit includes a voltage comparator, a multiplexer, and an adaptive current bias generator. The voltage comparator receives first and second input voltages, and outputs a comparator signal based on the first and second input voltages. The multiplexer selects a larger of the first and second input voltages in time based on first comparator signal. The adaptive current bias generator generates a bias current for the voltage comparator during a transition from a first state to a second state. The first input voltage is continuously larger than the second input voltage during the first state, and the second input voltage is continuously larger than the first input voltage in the second state. The bias current during the transition has a time-varying current level that is proportional to a time-varying difference between the first input voltage and the second input voltage during the transition.

Abstract: A system for controlling a current in a power converter configured to generate an output voltage may include a control loop having a plurality of comparators, each comparator having a respective reference voltage to which the output voltage is compared, a digital controller configured to calculate one or more pre-seeded control parameters for the current, and an analog state machine configured to, based on outputs of the plurality of comparators, select control parameters for controlling the current. The control parameters may be selected from the pre-seeded control parameters, control parameters for controlling the current to have a magnitude of zero, and control parameters for controlling the current to have a maximum magnitude.

Abstract: Methods, systems, and apparatuses for producing a compensated voltage reference. The method includes operating a voltage reference circuit. The method also includes activating a first compensation circuit when an operating temperature is less than or equal to a first temperature threshold. The first compensation circuit is configured to extract a first compensation current from the voltage reference circuit. The method further includes deactivating the first compensation circuit when the operating temperature is greater than the first temperature threshold. The method also includes activating a second compensation circuit when the operating temperature is greater than or equal to a second temperature threshold. The second compensation circuit is configured to extract a second compensation current from voltage reference circuit. The second temperature threshold is greater than the first temperature threshold.

Abstract: A switching control circuit for a power supply circuit that generates an output voltage from an AC voltage. The power supply circuit includes a rectifier circuit rectifying the AC voltage, an inductor receiving the rectified AC voltage, and a transistor controlling an inductor current flowing through the inductor. The switching control circuit controls switching of the transistor, based on the inductor current and the output voltage. The switching control circuit includes a target value output circuit that outputs a target value of a peak value of the inductor current for shaping a waveform of the peak value so as to be similar to a waveform of the rectified voltage, and a drive signal output circuit that outputs a drive signal to turn on the transistor upon the inductor current falling below a predetermined value and turn off the transistor upon the peak value of the inductor current reaching the target value.

Abstract: A buck converter includes a quick response circuit, a compensator coupled to an output node, an interleaving logic circuit coupled to the compensator, a plurality of on-time generators, a plurality of OR gates coupled to the corresponding on-time generator, a plurality of power stages coupled to the corresponding OR gates, a plurality of inductors and an output capacitor. Each on-time generator is coupled to the interleaving logic circuit, an input node and the output node. The quick response circuit includes a voltage droop sensor coupled to the output node, a load frequency sensor coupled to the output node, a quick response signal generator coupled to the voltage droop sensor, a maximum quick response signal generator coupled to the voltage droop sensor and the load frequency sensor, an AND gate coupled to the quick response signal generator, the maximum quick response signal generator and the plurality of OR gates.

Abstract: Methods, circuits, and devices for power conversion are disclosed. In some embodiments, the device comprises a circuit comprising a first, second, and third leg. Each leg may comprise two switches. The first leg is switched at a first frequency to generate a first signal, and the second leg is switched at a second frequency lower than the first frequency to generate a second signal. The third leg is switched by a neutral leg control signal to generate a third signal. The circuit generates an output power signal (e.g., a split-phase power signal) based on the first signal, second signal, and the third signal.

Abstract: A vehicle includes a traction battery and a converter. The converter includes a switch and first and second busbars electrically connected in parallel between the traction battery and the switch. The second busbar has an inductance less than the first busbar and includes a resistor having a resistance at least an order of magnitude greater than a resistance of the first busbar.

Abstract: A power converter circuit that includes multiple phase circuits may employ coupled inductors to generate a particular voltage level on a regulated power supply node. Based on a comparison of a voltage level of the regulated power supply node and a reference voltage, the power converter circuit may initiate an active period, during which the phase circuits source respective currents to the regulated power supply node via corresponding coils included in the coupled inductor. After a time period has elapsed following an initiation of the active period, the operation of the phase circuits is adjusted so that the respective currents flowing in the coils of the coupled inductor are out of phase.