Abstract: A printed circuit board (PCB) power cell (100) for arranging in a multi-cell power supply (500) includes a housing assembly (102) with a multiple section housing (104, 106), and a PCB assembly (120) positioned within the housing assembly (102), wherein the housing assembly (102) and the PCB assembly (120) are configured to provide an integrated voltage isolation of the power cell (100) which supports an output voltage of the multi-cell power supply (500). Furthermore, a multi-cell power supply (500) including a PCB power cell (100) with isolation is described.

Abstract: A resonant power conversion device includes a primary side circuit, a frequency detecting circuit, a resonant converting circuit, a secondary side circuit, a secondary detecting circuit, and a control circuit. The primary side circuit receives, according to a control signal having a primary frequency, an input power to output a primary side power. The frequency of the primary side power corresponds to the primary frequency. The frequency detecting circuit detects and converts the primary frequency into a corresponding potential. The resonant converting circuit electrically couples the primary side power to output a resonant power. The secondary side circuit converts the resonant power into a secondary side power. The secondary detecting circuit detects the secondary side power and correspondingly generates a voltage signal. The control circuit outputs the control signal according to the voltage signal, and doesn't output the control signal when the corresponding potential is higher than a predetermined level.

Abstract: A system and method is provided for controlling conversion of a received DC voltage (Vdc) into an AC inverter voltage. The method includes determining a reference Vpor (Vpor_REF) based on measured or estimated Vdc such that Vpor_REF is feasible at all values of Vdc for regulating a modulation index signal M_abc at a selectable frequency ? as a function of a measured or estimated voltage at the point of reference (Vpor), wherein M_abc is regulated by Vpor_REF to regulate the inverter hardware circuit to output the AC inverter voltage in order for Vpor to satisfy a requirement appropriate for the load.

Abstract: A method of creating thermal boundaries in a substrate is provided. The method includes forming the substrate with first and second sections to be in direct thermal communication with first and second thermal elements, respectively, machining, in the substrate, first and second cavities for defining a third section of the substrate between the first and second sections and disposing a material having a characteristic thermal conductivity that is substantially less than that of the ceramic in the first and second cavities.

Abstract: An object of the invention is to provide a power converter that can be reduced in size. To achieve this, a power converter according to the invention includes: water passages arranged radially from an assumed central axis, each being trapezoid-shaped in cross section; and power modules placed between the water passages such that each of the power modules is sandwiched from both surfaces thereof by the water passages. Each of the power modules has an output terminal and positive and negative terminals on an end face located in a centrifugal direction side with respect to the assumed central axis. Any of the power modules and an adjacent one of the power modules are set in a front-back inverted manner.

Abstract: An apparatus for power conversion comprises a voltage transformation element, a regulating element, and a controller; wherein, a period of the voltage transformation element is equal to a product of a coefficient and a period of the regulating circuit, and wherein the coefficient is selected from a group consisting of a positive integer and a reciprocal of said integer.

Abstract: A solar powered pump that maximizes available energy usage under variable insolation conditions is disclosed. It also permits the integration of parameters such as minimum flow control, set point operation, etc., without the use of additional sensors, thereby reducing the overall cost of the system. It comprises a solar array or other intermittent power source, a motor drive system that provides the power to an electric motor through a variable output power module and a flow loop comprising a pump coupled to the motor, valves and one or more sensors for flow control. The variable output power module uses data from at least one of the sensors to maximize power utilization by maximizing the flow rate in the fluid circuit/loop.

Abstract: A full bridge LLC resonant converter can include: a full bridge circuit including a first input node and a second input node; a LLC resonant tank circuit connected to the first input node and the second input node; a transformer winding part connected to the LLC resonant tank circuit; a rectifier circuit connected to the transformer through a first output node and a second output node; and a capacitor connected between the first input node and the first output node. The LLC resonant tank circuit can include a resonant capacitor connected to the first input node, a resonant inductor connected to the resonant capacitor, and a magnetizing inductance connected between the resonant inductor and the second input node.

Abstract: A soft-switching and low input current ripple inverter circuit is disclosed. It includes two paralleled dual-switch forward inverter circuits with a single transformer, two clamping diodes, and one coupling capacitor. It has voltage-clamping function on the switches with a lossless snubber at the turn-off instant and provides enough leakage energy to achieve zero-voltage switching operation with low input current ripple feature. Two set of the driver signals with 180 phase shift each other are used to control the switches of said first and second dual-switch forward inverters, respectively. Each set of driver signals includes one PWM signal (D) and one near 50% duty cycle driver signal. Employing the proposed inverter circuit, the switch's turn-on voltage can be reduced to half input voltage compared to its prior art circuits. Consequently, the switching losses are thus reduced and efficiency is improved, especially in light-load operation.

Abstract: An example vehicle electrical power system includes a battery operable to power a load of a vehicle over a direct current (DC) bus, a multiphase alternating current (AC) machine comprising a plurality of windings, and a power converter. The power converter includes a plurality of power switches and a controller. The controller is configured to, in a first mode, operate the power converter as an active rectifier that provides current to the DC bus to supply DC loads, and charge the battery from the current on the DC bus; and in a second mode, operate the power converter as a boost converter that converts a variable output voltage of the battery to a constant voltage on the DC bus. The power converter utilizes the plurality of windings when operated as an active rectifier and boost converter. A method of operating a vehicle electrical power system is also disclosed.

Abstract: The present application provides a control circuit of a switching power supply, the control circuit comprising: a central control circuit which has a first control port, a second control port, and a third control port; and a current selection circuit which is disposed between the third control port and a ground and has two or more selection terminals, a connection state between the selection terminals being switched between different connection states to adjust the output current value of the switching power supply, wherein the different connection states include disconnection, shorting, and connection with a resistor having a predetermined resistance value. According to the present application, the output current value of the switching power supply is adjusted by switching the connection state between the selection terminals between the states of disconnection, shorting, and connection with a resistor having a predetermined resistance value.

Abstract: A converter includes a transformer, a main switch, an active clamping circuit, a synchronous rectifying switch and a processing circuit. The transformer includes a primary winding and a secondary winding. The main switch is coupled to the primary winding. The active clamping circuit clamps the voltage across the main switch when it is OFF. The active clamping circuit includes an auxiliary switch. The synchronous rectifying switch is coupled to the secondary winding. The processing circuit determines whether the rectifying switch is in a main conducting period or a sub conducting period according to a first voltage signal across the rectifying switch and at least one detecting signal from the converter, and generates a driving signal to control the synchronous rectifying switch accordingly.

Abstract: A charging system and charging method for a terminal (2), and a power adapter (1) and a switch power source. The switch power source comprises a first rectification unit (101), a switch unit (102), a transformer (103), a second rectification unit (104), a sampling unit (106) and a control unit (107), wherein the control unit (107) outputs a control signal to the switch unit (102) and adjusts a voltage of a first pulse waveform according to a voltage sampling value and/or a current sampling value sampled by the sampling unit (106) to obtain a primary sampling voltage, and adjusts a duty ratio of the control signal according to the primary sampling voltage, the voltage sampling value and/or the current sampling value, so that a voltage of a third pulse waveform satisfies a charging requirement. The switch power source can make an output voltage and current waveform change along with an input voltage and current waveform, so that a good power factor can be obtained.

Abstract: Electronic circuitry and method of operating the same to shape and reduce the circulating current through the active clamp in a flyback converter and to harvest most of the leakage inductance energy to provide the bias power. Methodologies for minimizing the circulating energy in the clamp circuit in order to improve efficiency of operation of the same. A method for using a portion of the leakage inductance energy in order to create zero voltage switching conditions at the main primary switch.

Abstract: A first wire (WP1, WN1, WC1) is provided between a first converter unit (U1) and a DC bus line (PL4, NL4, CL4). A second wire (WP2, WN2, WC2) is provided between a second converter unit (U2) and a DC bus line (PL4, NL4, CL4). A third wire (WP3, WN3, WC3) is provided between a third converter unit (U3) and a DC bus line (PL4, NL4, CL4). A first fuse (FP1, FN1, FC1) is inserted in each of the first wire (WP1, WN1, WC1). A second fuse (FP2, FN2, FC2) is inserted in each of the second wire (WP2, WN2, WC2). A third fuse (FP3, FN3, FC3) is inserted in each of the third wire (WP3, WN3, WC3).

Abstract: A method and system of controlling a power converter operatively coupled with an electric grid, includes: operating the power converter in a direct power control mode with a dynamic switching table, the dynamic switching table including a group of converter space vectors and switching rules associated with the grid voltage and the dc-link voltage of the power converter; detecting abnormalities in the grid voltage and/or the converter dc-link voltage due to a grid fault event relative to their nominal operating conditions; determining a group of crossover angles for a group of converter vectors including the nearest three vectors to a grid voltage vector location inside a hexagonal space vector diagram; dynamically selecting a proper vector based on algorithmic feedforward of the group of crossover angles to dynamically construct the dynamic switching table; and controlling an output power of the power converter.

Abstract: The present technique relates to a protection circuit for a MOSFET and a protection circuit system including the protection circuit all of which can reduce losses in the main current and increase in the manufacturing costs for ensuring a sense area. The protection circuit includes: a first MOSFET for power through which a main current flows; an IGBT which is connected in parallel to the first MOSFET and through which a current diverted from the main current flows; a sense resistor connected in series with the IGBT; and a first control circuit that controls a gate voltage of the first MOSFET based on a value of a voltage to be applied to the sense resistor, wherein a ratio of the diverted current flowing through the IGBT to the main current flowing through the first MOSFET in current value ranges from 0.018% to 0.022%.

Abstract: The capacitor module includes a capacitor, a relay substrate, a first connection terminal member, and a second connection terminal member. The capacitor includes a capacitor body, a first lead wire, and a second lead wire. The first lead wire and the second lead wire are drawn out from the capacitor body. The relay substrate includes a first conductive pattern and a second conductive pattern. The first conductive pattern is electrically connected with the first lead wire. And the second conductive pattern is electrically connected with the second lead wire. The first connection terminal member is electrically connected to the first conductive pattern. The first connection terminal member includes a first terminal part configured to be electrically connected to an external connector. The second connection terminal member is electrically connected to the second conductive pattern.

Abstract: A Vfc balance controller includes a coefficient multiplying circuit that calculates a value of one half of a voltage, a subtractor, an adder, and a corrector. The adder adds a correction term V?·sin to the output from the coefficient multiplying circuit. The subtractor calculates the difference between voltage Vfc1 of a flying capacitor and the output from the adder. The corrector outputs a correction time of a pulse width so that the output from the subtractor converges to zero. The voltage of the flying capacitor is varied in this manner to reduce ripples on a DC line.

Abstract: The present invention is directed to improving the bonding strength between a bonding wire and a lead frame bonded to a plurality of semiconductor devices electrically connected in parallel. One end and the other end of a first bonding wire are connected to a control electrode and a first lead frame portion or a bent portion of a first semiconductor device, and one end and the other end of a second bonding wire are connected to a control electrode and a second lead frame portion of a second semiconductor device. The first lead frame portion extends in a direction overlapping with the first semiconductor device from the bent portion toward the side opposite to the first semiconductor device side, and the second lead frame portion extends from the bent portion toward the second semiconductor device side in a direction overlapping with the second semiconductor device.

Abstract: A power conversion apparatus includes a plurality of semiconductor modules each with a power terminal protruding therefrom, a capacitor, and a pair of bus bars. The power terminals include a pair of DC terminals electrically connected to the capacitor via the bus bars, and an AC terminal. Each of the bus bars includes terminal connection portions welded to the respective DC terminals and a common portion electrically connected to the plurality of terminal connection portions. The common portions are arranged between the sets of the plurality of power terminals. An insulation member is interposed between the pair of common portions. High-thermal-resistance portions having a higher thermal resistance than the terminal connection portions are each formed between the corresponding terminal connection portion and the corresponding common portion.

Abstract: There is provided a composite material containing magnetic powder and a polymeric material including the powder in a dispersion state, wherein a content of the magnetic powder with respect to the whole composite material is more than 50% by volume and 75% by volume or less, a saturation magnetic flux density of the composite material is 0.6 T or more, and a relative magnetic permeability of the composite material is more than 20 and is 35 or less. It is preferable that a density ratio of the magnetic powder should be 0.38 or more and 0.65 or less. The density ratio is set to be an apparent density/a true density. Moreover, it is preferable that the magnetic powder should include a plurality of particles constituted of the same material.

Abstract: A power conversion apparatus in which wiring lines are provided between DC buses of a first converter unit and DC buses of a second converter unit. The wiring lines are provided between the DC buses of the second converter unit and DC buses of a third converter unit. Fuses are interposed in the wiring lines, respectively.

Abstract: A converter circuit includes a power stage circuit configured to convert an input voltage received by an inductor to an output voltage provided at an output; a control circuit configured to generate input pulses to control the power stage circuit; a slope compensation circuit configured to provide a compensation signal to the control circuit for overcoming a sub-harmonic oscillation in the converter circuit, wherein the control circuit is configured to generate the input pulses based at least in part on the compensation signal; a slope compensation adjustment circuit configured to determine a rate of change of a current at the inductor and to provide a slope compensation adjustment signal based on the determined rate of change; and a modulation circuit configured to modulate the compensation signal with the slope compensation adjustment signal to produce the adjusted slope compensation signal.

Abstract: A three-level inverter includes a first semiconductor switching element disposed between a direct-current high potential terminal and an alternating-current output terminal, a second semiconductor switching element disposed between a direct-current low potential terminal, which is paired with the direct-current high potential terminal, and the alternating-current output terminal, first and second reflux diodes which are disposed reverse-parallelly with the first and second semiconductor switching elements, respectively, and a semiconductor circuit which controls gate voltages of the first and second semiconductor switching elements by selectively applying thereto a direct-current intermediate voltage which is given to a direct-current intermediate potential terminal. Inductance elements are connected in series to the first and second reflux diodes, respectively.

Abstract: Systems and methods described herein provide examples of an electrical panel (e.g., a modular electrical panel) that is configured to control a plurality of electrical loads. The electrical panel may include a control circuit, memory, a communication circuit, and an alternating current (AC) line feed and/or a direct current (DC) line feed. The electrical panel may also include a plurality of power supplies and a plurality of control modules, where more than one control module is associated with each of the plurality of power supplies. Each control module may configured to receive DC power from the associated power supply and provide an output voltage to at least one electrical load. The electrical panel provides flexibility as to whether each stage of conversion, regulation, and/or control is performed at a control module located within the electrical panel or performed at an accessory module located at an electrical load.

Abstract: The power supply apparatus alternately repeats a control between a first control of varying a frequency of switching operation within a predetermined range and for a predetermined cycle according to a frequency determined based on a feedback voltage, and a second control of varying the frequency within a range narrower than the predetermined range or a third control of controlling the frequency to be a constant frequency.

Abstract: In a power converter including a plurality of switches, a plurality of freewheeling diodes each electrically connected in anti-parallel with a respective one of the switches, a freewheeling current input electrically connected to an output terminal of each of the switches, and a freewheeling current output electrically connected to an input terminal of each of the switches, a plurality of freewheeling current paths are defined, each of which is an electrical path passing through a respective one of the freewheeling diodes from the freewheeling current input to the freewheeling current output. At least one of the freewheeling current paths is a maximum path having a maximum impedance among the freewheeling current paths. A voltage drop across the freewheeling diode included in the maximum path is less than a voltage drop across each of the other freewheeling diodes when a freewheeling current flows through each of the plurality of freewheeling diodes.

Abstract: A flyback converter includes a primary-side switch connected to a primary-side winding of a magnetic device and a secondary-side switch connected to a secondary-side winding of the magnetic device. The flyback converter is operated by controlling the primary-side switch to store energy in the magnetic device during ON periods of the primary-side switch, switching on the secondary-side switch synchronously with switching off the primary-side switch to transfer energy from the magnetic device to the secondary side, determining an off time of the secondary-side switch based on a reflected input voltage measured at the secondary-side winding when the primary-side switch is on, accounting for a settling time of the reflected input voltage when determining the off time of the secondary-side switch so that the settling time has little or no effect on the off time, and switching off the secondary-side switch based on the off time.

Abstract: A semiconductor module according to one embodiment includes a circuit substrate and first and second transistors for upper and lower arms of a power conversion circuit. The circuit substrate includes a substrate having first and second insulating parts and a conductive layer disposed therebetween, first and second input interconnection patterns coupled to the first and second input terminals, and an output interconnection pattern coupled to an output terminal. The first and second transistors are electrically coupled to the first and second input terminals through the first and second input interconnection patterns, respectively. The conductive layer has a first area situated opposite the first input interconnection pattern and a second area electrically coupled to the first area. The second area is electrically coupled to the second input interconnection pattern.

Abstract: In a case where a switching element of an inverter does not operate properly due to failure or the like, a three-phase short circuit cannot be made, and an induced voltage cannot be suppressed. An induced voltage suppression device is electrically connected to the three-phase wiring between the power converter and the motor, in parallel to the power converter. A rectification circuit including a three-phase diode bridge circuit. A DC voltage source including a capacitor. A voltage detection circuit detects a voltage of both ends of the DC voltage source. In a short circuit, when a transistor of the voltage detection circuit is turned on, transistors are turned on to perform three-phase short-circuit operation to suppress an induced voltage of the motor. Since the induced voltage suppression device secures a DC voltage by the induced voltage of the motor as a drive source in a self-excited manner, it is possible to suppress the induced voltage even when an abnormality occurs in the power converter.

Abstract: This invention discloses a controller and method for a cyber synchronous machine (CSM, in short, cybersync machine), namely, a power electronic converter that is seamlessly equipped with computational algorithms (i.e., the controller) to represent the intrinsic and fundamental principles of physical synchronous machines. The CSM can be operated in the grid-connected mode or the islanded mode to take part in the regulation of the frequency and the voltage. The controller also includes auxiliary blocks to achieve self-synchronization without measuring or estimating the grid frequency and the regulation of real power and reactive power to the given reference values without static errors. The control signal for the power electronic converter can be the output voltage generated by the engendering block or the sum of the output voltage and the virtual current.

Abstract: A semiconductor device may include: a semiconductor substrate; a surface electrode covering a surface of the semiconductor substrate; an insulating protection film covering a part of a surface of the surface electrode; and a solder-bonding metal film, the solder-bonding metal film covering a range spreading from a surface of the insulating protection film to the surface of the surface electrode, wherein the surface electrode may include: a first metal film provided on the semiconductor substrate; a second metal film being in contact with a surface of the first metal film, and having tensile strength higher than tensile strength of the first metal film; and a third metal film being in contact with a surface of the second metal film, and having tensile strength which is lower than the tensile strength of the second metal film and is higher than the tensile strength of the first metal film.

Abstract: An electric power conversion device includes an element-side first electrode conductor and an element-side second electrode conductor extending from a semiconductor element section toward one side in a first direction, and a capacitor-side first electrode conductor and a capacitor-side second electrode conductor extending from the capacitors toward the other side in the first direction, wherein a connecting surface of the element-side first electrode conductor and a connecting surface of the capacitor-side first electrode conductor overlap with each other and are electrically connected to each other, and a connecting surface of the element-side second electrode conductor and a connecting surface of the capacitor-side second electrode conductor overlap with each other and are electrically connected to each other.

Abstract: The present invention relates to a technique for expanding an input voltage range of a power conversion circuit for photovoltaic power generation, and improving the efficiency of the power conversion circuit.

Abstract: Systems and methods of quasi-resonant induction heating are provided. In particular, an induction heating system having a quasi-resonant topology can have a quasi-resonant inverter. The inverter can include an induction heating coil configured to inductively head a load with a magnetic field, and a power supply circuit configured to supply a power signal to the induction heating coil. The inverter can further include a first switching element and a second switching element coupled in parallel with the first switching element. The inverter can further include a resonant capacitor coupled in parallel with the induction heating coil. The inverter can further include one or more control devices configured to control operation of the first and second switching elements to regulate an amount of current provided to the induction coil based at least in part on a desired operating frequency associated with the quasi-resonant inverter.

Abstract: An electric assembly includes a bipolar switching device and a transistor circuit. The transistor circuit is electrically connected in parallel with the bipolar switching device and includes a normally-on wide bandgap transistor.

Abstract: A conversion circuit device for connecting lithium based batteries to a standard inverter/charger for lead-acid batteries and an Uninterruptible Power Supply (UPS) system for homes and facilities comprising a standard inverter/charger for lead-acid batteries, at least one lithium based battery, and a conversion circuit device connecting the at least one lithium based battery to the standard inverter/charger; the conversion circuit device translating the state of the at least one lithium based battery into signals that correspond to the state of a lead-acid battery.

Abstract: A plurality of semiconductor elements and a control circuit unit are provided. The plurality of semiconductor elements which are connected in parallel are configured to perform switching at the same time. The control circuit unit includes a drive circuit connected to the plurality of semiconductor elements which perform operation at the same time, control wirings and reference wirings. The control wirings connect control electrodes of the semiconductor elements to the drive circuit. The reference wirings connect reference electrodes of the semiconductor elements to the drive circuit. A parasitic inductance in the reference wiring is made smaller than a parasitic inductance in the control wiring.

Abstract: The combined voltage regulator and snubber circuit generally has a voltage regulator device in parallel with the energy storage element of the snubber circuit operatively connectable in series with a leakage inductance current path; the leakage inductance being part of a magnetic component utilized in a switch-mode power supply having an input voltage source, controllable semiconductor switches, freewheeling semiconductor switches, feedback controller, reactive energy storage components and a load; the voltage regulator generally providing constant or variable voltage to the gate driver of the controllable semiconductor and/or feedback controller; the snubber circuit generally recycling leakage inductance energy to the input capacitor of a neighboring cell in a multi-cell stacked converter.

Abstract: System and method for regulating a power conversion system. A system controller for regulating a power conversion system includes an operation-mode-selection component and a driving component. The operation-mode-selection component is configured to receive a first signal related to an output load of the power conversion system and a second signal related to an input signal received by the power conversion system and output a mode-selection signal based on at least information associated with the first signal and the second signal. The driving component is configured to receive the mode-selection signal and generate a drive signal based on at least information associated with the mode-selection signal, the driving signal corresponding to a switching frequency.

Abstract: A converter configured to convert a DC input voltage to a DC output voltage, may include: a high-side driver circuit having a first terminal coupled to a first die pad; a high-side transistor having a drain terminal coupled to a second die pad and a source terminal coupled to a third die pad; and a low-side transistor having a source terminal coupled to a fourth die pad and a drain terminal coupled to a fifth die pad. The converter may further include a resistive element coupled between the source terminal of the high-side transistor and the drain terminal of the low-side transistor, where a second terminal of the high-side driver circuit is coupled to a sixth die pad.

Abstract: According to one embodiment, a vehicle-use storage battery system includes a storage battery, a main circuit, a circuit breaker, a storage battery management unit, a first determiner, and a second determiner. The main circuit is electrically connected to the storage battery. The circuit breaker is disposed between the storage battery and the main circuit to make or break the electrical connection therebetween. The storage battery management unit manages an operating state of the storage battery. The first determiner determines whether to break the electrical connection between the storage battery and the main circuit by means of the circuit breaker. The second determiner determines, on the basis of at least one of operating states of the storage battery management unit, the first determiner, and the circuit breaker, whether to break the electrical connection between the storage battery and the main circuit by means of the circuit breaker.

Abstract: A switch-mode power supply controller controls a circuit that includes a flyback-based, switch-mode power supply in the context of an input voltage source, a USB Type-C PD controller and an output load. The switch-mode power supply controller may be configured to estimate input voltage based on a measured magnetizing inductance discharge time. Furthermore, the switch-mode power supply controller may be configured to estimate output voltage based on the measured magnetizing inductance discharge time and the estimated input voltage. Still further, the estimated voltages may be used by the switch-mode power supply controller to limit certain currents and optimize power efficiency. Even further, the estimated and measured value may be employed by the switch-mode power supply controller to estimate and indicate brownout conditions.

Abstract: A controller for use in a power converter comprising a feedback reference circuit coupled to receive a feedback signal representative of an output voltage of the power converter. A feedback reference circuit generates a drive signal in response to the feedback signal and the drive signal is used to control switching of a power switch of the power converter to regulate the output voltage. The controller further comprises 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. The output power control circuit generates an adjust signal to adjust the feedback signal such that the controller modifies the output voltage to regulate to the desired value of the output power.

Abstract: A method and apparatus for controlling a power converter are provided. In the method and apparatus, switching from a first phase to a second phase is delayed until it is determined that both a tank current signal of the converter goes below a tank current threshold and the converter has been in the first phase for more than a first minimum time period. Then the converter determines if a resonant capacitor voltage has fallen below a first resonant capacitance voltage threshold and if a tank current signal goes above a tank current threshold. The converter switches from the first phase to the second phase in response to determining at least one of: the resonant capacitor voltage has fallen below the first resonant capacitance voltage threshold and the tank current signal goes above the tank current threshold. The converter is additionally operated in third and fourth states.

Abstract: The present disclosure discloses a charging system and method, and a power adapter. The system includes a power adapter and a terminal. The power adapter includes a first rectifier, a switch unit, a transformer, a synthesizing unit, a sampling unit, and a control unit. The control unit outputs a control signal to the switch unit, and adjusts a duty ratio of the control signal according to a current sampling value and/or a voltage sampling value, such that a second alternating current outputted by the synthesizing unit meets a charging requirement. The terminal includes a battery.

Abstract: The present invention discloses an isolated switch-mode power supply, a control circuit and a control method thereof. The main power transistor and the synchronous rectifier transistor are connected respectively to the primary-side winding and secondary-side winding of the isolated switch-mode power supply. The voltage of the control terminal of the main power transistor starts to increase, the main power transistor is turned on gradually, the current flowing through the main power transistor starts to increase until reaches the predetermined current-limiting value; the current of the main power transistor is maintained at the current-limiting value by controlling the voltage of the control terminal of the main power transistor; the secondary-side synchronous rectifier transistor is turned off, the current of the main power transistor decreases from the current-limiting value to the normal operation value, and the main power transistor is completely in an ON condition.

Abstract: A power conversion apparatus, power conversion method, and a power conversion system can reduce the occurrence of unnecessary power loss. The power conversion apparatus converts direct current (DC) power supplied by a solar cell into alternating current (AC) power. The power conversion apparatus includes a DC filter unit, a memory, and a controller. The DC filter unit includes a noise filter that reduces noise in the DC power supplied by the solar cell and a switch that connects an input terminal and an output terminal of the noise filter. The controller controls the switch in accordance with output power of the DC filter unit.

Abstract: A switch mode power supply can include a bipolar device (e.g., bipolar junction transistor) connected in series with a capacitor and operable as a bipolar clamp switch where the bipolar device can be turned on by forward biasing a collector-base junction. The capacitor connected in association with the bipolar device can keep the bipolar clamp switch conductive for a limited time based on energy obtained from a transformer primary winding and stored in the capacitor when the base-collector junction bias is reversed. Storage charge properties of the bipolar clamp switch can be used to keep it conductive and working as an active clamp without requiring a high driver circuit.