Abstract: A power conversion apparatus and an over current protection (OCP) method thereof are provided. The OCP method includes generating a pulse-width-modulation (PWM) signal according to a loading status of an electronic device, so as to switch a power switch in the power conversion apparatus and thus making the power conversion apparatus providing an output voltage to the electronic device; generating an OCP reference signal with variable slope according to a feedback signal related to the loading status of the electronic device and a system operation voltage of a PWM controller chip in the power conversion apparatus that is used for generating the PWM signal; and comparing a sensing voltage corresponding to a current following through the power switch on a resistor, and the OCP reference signal with variable slope to determine whether to activate an OCP mechanism to control the PWM controller chip whether to generate the PWM signal.

Abstract: An isolated power converter comprising a transformer arranged in such a way that the mirrored primary voltage on the secondary side has a positive potential relative to ground, said converter comprising a derivating net arranged to cause the second transistor to conduct in dependence of the voltage across the secondary winding, the source of the second transistor being connected to the negative end of the secondary winding, the drain of a third transistor further being connected to the positive end of the secondary winding, a second capacitor and a second resistor being connected between the gate and the source of the third transistor, a third resistor connected between the second resistor and the drain of the second transistor, a third capacitor connected between the sources of the second and third transistors to provide a first output voltage on one terminal of the third capacitor and a second output voltage on the other terminal of the third capacitor.

Abstract: An adaptive inductive ballast is provided with the capability to communicate with a remote device powered by the ballast. To improve the operation of the ballast, the ballast changes its operating characteristics based upon information received from the remote device. Further, the ballast may provide a path for the remote device to communicate with device other than the adaptive inductive ballast.

Abstract: An example controller includes a feedback sensor circuit that receives a feedback signal representative of an output of a power converter. A feedback sampling signal generator is coupled to generate a feedback sampling signal. The feedback sensor circuit samples the feedback signal in response to the feedback sampling signal. A state machine controls switching of a switch of a power converter circuit according to one of a plurality of operating condition states in response to the feedback sensor circuit. Each of the plurality of operating condition states includes a substantially fixed switch on time. A feedback time period signal generator generates a feedback time period signal received by the state machine. A period of the feedback time period signal is substantially greater than a period of the feedback sampling signal. The state machine is updated in response to the feedback time period signal.

Abstract: In an image forming apparatus, a monitoring unit monitors whether a returning factor required to switch an operational state of the apparatus from a power-saving mode to an operating mode is generated, an antenna unit receives external electrical wave, a power generation unit generates electricity from the received electrical wave and supplies the electricity to the monitoring unit, and a controlling unit switches the operational state of the apparatus from the power-saving mode to the operating mode when the monitoring unit detects generation of a returning factor.

Abstract: In a PFC (power factor correction) control unit for controlling a PFC converter, a transconductance amplifier is coupled to receive a feedback signal representative of an output voltage of the PFC converter. The transconductance amplifier is coupled to generate an output error signal in response to the feedback signal. A PWM (pulse width modulated) converter is coupled to receive the output error signal, the PWM converter is coupled to generate a PWM signal in response to the output error signal. A chopper is coupled to receive the PWM signal. The chopper is coupled to switch a current representative of an input current of the PFC converter in response to the PWM signal. A filter is coupled to receive the switched current representative of the input current of the PFC converter. The filter is coupled to generate a PFC converter control signal in response to the filtered switched current representative of the input current of the PFC converter.

Abstract: The DC power supply apparatus includes a switching operation control part that is provided between a current detection part to detect a current flowing through a primary coil of a transformer and a control part to control the operation of a switching part and controls the operation of the switching part according to an output voltage so that consumption power in a low-load state can be further reduced.

Abstract: A switch device is brought into conduction in a case where a carrier takes a value zero to drt, a switch device is brought into conduction in a case where the carrier takes a value the drt to one, and one cycle of the carrier is divided into a period in which the carrier has a command value or more and a period in which the carrier has the command value or less. The periods are calculated by dst·T and drt·T, respectively. The same one as the carrier of a converter is employed in a carrier of an inverter, and based on the value drt set as a reference value, a command value of the inverter is provided in each of a side with a value larger than the reference value and a side with a value smaller than the reference value. The period in which the carrier takes the value or more is divided at a ratio among d0, d4 and d6, and the period in which the carrier takes the value drt or less is divided at the ratio among d0, d4 and d6.

Abstract: A power conversion system for providing power to an electrical grid is described. The system includes a boost converter coupled to a photovoltaic (PV) array and configured to control a PV array voltage. The system also includes an inverter coupled to the boost converter by at least one conductor and configured to regulate a voltage drop across the at least one conductor. The system also includes a system controller configured to control operation of the boost converter and the inverter.

Abstract: A circuit used to convert DC input to AC output comprises a transformer and three series sub-circuits. The first series sub-circuit is connected in parallel with the DC input and comprises first and second capacitors connected in series. The secondary series sub-circuit is connected in parallel with the DC input and comprises a first primary winding of the transformer, a clamping capacitor and a second primary winding of the transformer sequentially connected in series. The third series sub-circuit connected in parallel with said clamping capacitor and comprises first and second switches connected in series. The center nodes of the first and third series sub-circuits are connected together. Thus, while a secondary winding of the transformer provides AC voltage, the circuit is able to effectively reduce current ripple and decrease voltage stress on semiconductor switch with minimum component count. Similar topologies may be used for rectification instead of inversion.

Abstract: A single-phase hybrid multilevel inverter is described that combines a 3-level leg and a 2-level leg to reduce the number of overall switching devices for a 5-level inverter. The 2-level inverter leg switches at a fundamental frequency and the 3-level flying capacitor leg uses PWM modulation to switch resulting in a low THD output voltage spectrum. The control method developed for the single-phase inverter is used to build a three-phase inverter comprised of three single-phase hybrid inverters in order to achieve a line-to-neutral voltage having five levels and a line-to-line voltage having nine levels.

Abstract: The device for converting direct current into alternate current comprises a multilevel converter associated with at least a source of direct current and a modulation unit having piloting means for piloting the converter for the conversion of the direct current into an alternate output current, in which the modulation unit comprises comparison means for comparing the output current value with a preset positive threshold value and a preset negative threshold value, the piloting means being suitable for piloting the converter with a pulse modulation of the unipolar type in the event of the output current value being above the positive threshold value or below the negative threshold value and with a pulse modulation of the complementary type in the event of the output current value being below the positive threshold value and above the negative threshold value.

Abstract: A DC-AC converter includes a DC-DC converter providing bi-directional conversion between a first DC power signal and a second DC power signal, the first DC power signal being on a first DC bus and the second DC power signal being on a second DC bus. The DC-AC converter also includes an inverter providing bi-directional DC-AC conversion between a third DC power signal and a first AC power signals the third DC power signal being on the second DC bus and the first AC power signal being on a first AC bus.

Abstract: A DC conversion apparatus comprises a first transformer, a second transformer, a parallel circuit having series circuits connected in parallel, one of the series circuits including a reactor and a primary winding of the first transformer, the other series circuit including a reactor and a primary winding of the second transformer, a conversion circuit converting a DC voltage of a DC power source into an AC voltage and outputting it to the parallel circuit, a first rectifying-smoothing circuit rectifying and smoothing a first voltage generated by a first secondary windings of the first transformer into a first DC output, and a second rectifying-smoothing circuit rectifying and smoothing a second voltage generated by a first secondary windings of the second transformer into a second DC output that is different from the first voltage. The second secondary windings of the first transformer are connected in parallel with the first secondary windings of the second transformer.

Abstract: A synchronous rectification type DC-DC converter equipped with a burst mode prevents backward flows of currents on the secondary side thereof. The DC-DC converter turns off a control signal of a switching element on the primary side when the load thereof becomes light, and includes a voltage converting transformer, a first switching element connected to the primary side coil of the transformer, a primary side control circuit performing on-off control of the first switching element, a synchronously rectifying second switching element connected to the secondary side coil, and a secondary side control circuit performing on-off control of the second switching element. A pulse width ensuring circuit ensures that the pulse width of the control signal performing on-off control of the first switching element does not become equal to or less than the original width of a PWM pulse when entering the burst mode and when exiting the burst mode.

Abstract: A fluorescent lamp device includes a frequency generator for generating a pulse signal, a driver circuit coupled to said frequency generator for generating at least one driving signal according to said pulse signal, a half bridge power switch unit coupled to the driver circuit, a resonant tank coupled to the half bridge power switch unit, and a fluorescent lamp coupled to the resonant tank.

Abstract: An embodiment of a voltage converter, designed to convert an input voltage into a regulated output voltage, having: a voltage transformer having a primary winding receiving the input voltage, a secondary winding supplying the output voltage (Vout), and an auxiliary winding supplying a feedback signal correlated to the output voltage; a control switch, connected to the primary winding; and a control circuit, connected to a control terminal of the control switch for controlling switching thereof as a function of the feedback signal. The control circuit is provided with a sampling stage that samples the feedback signal and supplies a sampled signal. An averager stage is connected to the output of the sampling stage and implements a low-pass filtering of the sampled signal so as to reduce undesirable oscillations due to sampling.

Abstract: An embodiment of a voltage converter includes: voltage-transformer means having a primary side, designed to receive an input voltage, and a secondary side, designed to supply an output voltage; control-switch means coupled to said primary side; and a control circuit, coupled to a control terminal of said control-switch means and designed to control switching thereof as a function of a first signal correlated to said output voltage; said control circuit being provided with an error-amplifier stage, designed to process a difference between said first signal and a reference signal, wherein said error-amplifier stage is configured so as to have a transconductance characteristic with a linear-operation region, having a given slope, and at least one first clamped region, which has a slope lower than said given slope and is contiguous to said linear-operation region.

Abstract: An example controller for use in a power supply regulator includes a switch signal generator, a modulation circuit, and a multi-cycle modulator circuit. The modulation circuit modulates the duty cycle of a pulse width modulated switching signal to provide a fixed peak switching current in the switch during light load conditions and a variable peak switching current during load conditions other than the light load condition. The multi-cycle modulator circuit enables the switch signal generator to provide a switch signal uninterrupted if the load condition is other than the light load condition and disables the switch signal generator for a first time period and then enables the switch signal generator for a second time period when the load condition is the light load condition. The multi-cycle modulator circuit adjusts the first time period in response to the feedback signal to regulate the output.

Abstract: There is provided a PWM inverter capable of preventing a phase error from occurring in generating a PWM signal even in the case where a carrier wave frequency is not sufficiently higher than a signal wave frequency. A PWM signal generating section (2) includes a phase adjusting section (11) configured to advance a phase of the signal wave by adding, to a signal wave, a delay component of the PWM signal with respect to the signal wave, the phase delay component being involved by digital control. Furthermore, in a case where the carrier wave frequency is changed, the phase delay component with respect to the signal wave is updated in synchronism with the timing of change of the carrier wave frequency.

Abstract: A power generation system including a photovoltaic (PV) module to generate direct current (DC) power is provided. The system includes a controller to determine a maximum power point for the power generation system and a boost converter for receiving control signals from the controller to boost the power from the PV module to a threshold voltage required to inject sinusoidal currents into the grid. A DC to alternating current (AC) multilevel inverter is provided in the system to supply the power from the PV module to a power grid. The system also includes a bypass circuit to bypass the boost converter when an input voltage of the DC to AC multilevel inverter is higher than or equal to the threshold voltage.

Abstract: A switching power supply apparatus employing a voltage obtained by rectifying an output from an AC power supply, as an input thereof includes a switching control circuit. The switching control circuit conducts a PFM control having a fixed ON-period of a switching device when a load is judged to be light based on a load signal indicating the load, and a PWM control when the load is judged not to be light. The switching control circuit changes the ON-period based on whether the AC power supply is a high voltage system or a low voltage system.

Abstract: Power generated by a solar battery of thin-film type is stepped up to a predetermined DC voltage by a step-up chopper circuit, and the predetermined DC voltage is converted into three-phase AC power by an inverter circuit, and the three-phase AC power is supplied to an AC power supply system via an output DC voltage circuit. The solar battery is not grounded, and a negative electrode thereof has a floating capacitance between the negative electrode and the ground. The AC power supply system is configured by three-phase star-connection, and the neutral point is grounded. The output DC voltage circuit includes three batteries, and the batteries are provided, for the respective phases, between the AC power supply system and a sine wave filter connected to the AC output side of the inverter circuit. Therefore, it is possible to prevent acceleration of the deterioration of the solar battery.

Abstract: The present invention proposes a circuit for converting DC into AC pulsed voltage. The circuit comprises two controllable semiconductor switches. By controlling the opening and closing of the semiconductor switches, the circuit can operate in different modes, i.e. high input voltage mode and low input voltage mode. The circuit for converting DC into AC pulsed voltage, proposed in the present invention, is suitable for a wide input voltage range. When the circuit is used as the driver circuit of a DBD lamp, the DBD lamp can still operate normally by switching to low-voltage DC supply in case of an AC supply failure, and the DBD lamp has a higher luminous efficiency.

Abstract: A method for operating an inverter for converting direct voltage into alternating voltage, having two direct-voltage terminals and two alternating-voltage terminals, between which a plurality of power switching elements clocked at high-frequency are connected. The high-frequency clocking of the power switching elements of the inverter is switched off around a zero transition of the alternating voltage for a period which depends on the direct voltage present at the direct-voltage terminals of the inverter and/or the output power of the inverter, so that no current is generated in time intervals with a poor efficiency at the alternating-voltage terminals of the inverter.

Abstract: A power converter according to the present invention includes a power supply unit, an output unit, and a switching controller. The power supply unit includes a primary coil of a transformer that receives an input voltage, a gate electrode, and a switch having a first electrode and a second electrode that is connected to the primary coil. The output unit includes a secondary coil of the transformer, and outputs an output voltage that is converted from the input voltage by the transformer. The switching controller includes a feedback terminal that receives a feedback voltage corresponding to the output voltage, generates a burst voltage by compensating the feedback voltage according to a maximum current value that can flow between the second electrode and the first electrode of the switch, determines whether to perform a burst mode operation according to the burst voltage, and transmits a gate signal according to performance of the burst mode operation to the gate electrode of the switch.

Abstract: Electronic devices such as portable electronic devices are provided. Power converters are provided that convert alternating-current power into direct-current power for powering the electronic devices. A power converter may rectify an alternating current line signal to produce a rectified alternating current signal having peaks and valleys. The power converter may have a capacitor and transformer coupled across the rectifier circuit. Power regulation switching circuitry in the power converter or the electronic device may regulate how much power is delivered to the electronic device. Relatively more power may be delivered during the peaks in the rectified signal than during the valleys. Pulsed power delivery may be controlled using control resources in the power converter, in the electronic device, or in both the power converter and electronic device.

Abstract: In an isolated switching power supply apparatus, by performing on/off control of a first switching device and a second switching device, energy is transmitted from the primary side to the secondary side using a second primary winding and a second secondary winding while the first switching device is on, and energy is transmitted by a first primary winding and a first secondary winding while the second switching device is on. The first secondary winding and the second secondary winding are connected in series with one another, and an inductor is inserted in series to the second secondary winding. An output current is made to flow through the inductor irrespective of whether the first switching device is on or the second switching device is on.

Abstract: A control circuit for a primary controlled switched-mode power supply that has a primary-side switch and a transmitter. It also relates to an associated switched-mode power supply. The control circuit can be connected to a control input of the primary-side switch so that the primary-side switch is controlled based on a secondary-side current flow time period in which a current flows through the secondary-side winding of the transmitter in order to regulate the output voltage. The secondary-side current flow time period can be used as a control parameter instead of the actual output voltage in order to then control the primary-side switch. Because the secondary-side current flow time period can be determined indirectly on the primary side, no direct feedback is necessary between the output voltage on the secondary side and the control circuit on the primary side.

Abstract: A phase locked loop is used to synchronize the switching frequency of a high frequency switching power converter to a clock signal. A switching power converter integrated circuit is a tile-based power management unit and includes an oscillator and multiple tiles of switching power converters. The oscillator generates a clock signal having a clock frequency. A first switching power converter includes a switch and a phase locked loop and switches at a first frequency. The switch has a gate that receives a gate signal. The phase locked loop synchronizes the first frequency to a first integer multiple of the clock frequency. A second switching power converter switches at a second frequency that is a second integer multiple of the clock frequency. The first frequency is synchronized to a multiple of the clock frequency when a second edge of the gate signal coincides with a first edge of the clock signal.

Abstract: At the starting time and an overload time in which the output voltage of the switching power source apparatus is low, if an overcurrent state, in which the ON period of the switching device becomes short and a current not less than the current limit value of the switching device flows through the switching device, occurs, this overcurrent state is detected. The blanking period of a blanking pulse signal is made shorter than the blanking period that is obtained during steady operation, and the ON period of the switching device is made shorter. Hence, the device current flowing through the switching device can be made small in each pulse for the switching operation, and, at the same time, the device current is suppressed from increasing each time a pulse for the switching operation is generated.

Abstract: An apparatus and method for controlling a DC-to-AC inverter is disclosed. The DC-to-AC inverter may be configured to convert DC power received from an alternative energy source to AC power for supplying an AC grid or load. The inverter may determine whether the power presently supplied by the alternative energy source is less than a predetermined amount of power and, if so, disable an output converter of the inverter. Additionally, the inverter may predict the voltage of a DC bus of the inverter at a future point in time and, if the predicted DC bus voltage is greater than a predetermined maximum DC bus voltage, enable the output converter to transfer energy from the DC bus to the AC grid to reduce the DC bus voltage.

Abstract: In one embodiment, a method of operating a switched-mode power supply having a switch coupled to a drive signal is disclosed. The method includes shutting off the switch with the drive signal at a first instance of time, and comparing a magnitude of a voltage of a power supply node to a threshold after shutting off the switch. If the magnitude of the voltage of the power supply node exceeds the threshold, the switch is inhibited from turning on for a first time interval.

Abstract: The present disclosure relates to a resonance circuit for DC-link voltage control in a DC-to-AC inverter. The resonance circuit comprises two active switches. Before the active switches of the DC-to-AC inverter are turned on, a DC-link voltage is isolated by the active switches and the active switches of the DC-to-AC inverter are discharged by the resonance circuit to zero voltage at both ends. Then, the active switches of the DC-to-AC inverter are turned on again after the DC-link voltage is charged by the resonance circuit until the DC-link voltage restores to a normal voltage value. Hence, the active switches of the DC-to-AC inverter achieve zero-voltage switching. Not only the switching loss can be reduced to enhance the conversion efficiency, but also the electro-magnetic interference as well as the RF interference due to dynamic transient changes of the voltage (dv/dt) and of the current (di/dt) can be lowered.

Abstract: A dynamically-compensated controller may generate a switching signal for a DC power supply. The controller may include a feedback circuit having a first analog-to-digital converter and a separate analyzer circuit for generating information indicative of performance characteristics of the feedback circuit based on information about the results of a test perturbation signal at an output of the DC power supply. The analyzer circuit may include a DC removal circuit configured to substantially filter out the DC component of the results of the test perturbation signal at the output of the DC power supply, a frequency translation circuit configured to translate the frequency of the filtered signal to a frequency that is lower than the frequency of the test perturbation signal, and a second analog-to-digital converter different from the first analog-to-digital converter that is configured to generate a signal representative of one or more of the characteristics of the filtered signal.

Abstract: The present invention relates to a power supply system and method including a power generator and a storage device. Specifically, the power supply method using a power supply system which includes a power generator, a storage device, a unidirectional converter, and a bidirectional interleaved converter, and in which the other side of the unidirectional converter is connected to the other side of the bidirectional interleaved converter and power is output from the other side of the unidirectional converter, the power supply method comprises measuring one or more of an amount of power generation of the power generator and an amount of power storage of the storage device; forming a power transfer path by analyzing one or more of the amount of power generation and the amount of power storage; and controlling activation of devices on the formed power transfer path.

Abstract: In a power converter, a primary coil of a transformer receives an input voltage, and a first terminal of a switch is coupled to the primary coil. An output unit includes a secondary coil of the transformer, and outputs an output voltage to which the input voltage is converted by the transformer. A switching controller receives a feedback voltage corresponding to the output voltage and a sensing voltage corresponding to a current flowing between the first terminal and a second terminal of the switch. The switching controller determines whether to perform an operation of a burst mode based on the feedback voltage. The switching controller generates a control signal by comparing the sensing voltage with a comparison voltage during a first period of the burst mode, generates the control signal by comparing the sensing voltage with a voltage corresponding to the feedback voltage during a second period of the burst mode, and transmits the control signal to a control terminal of the switch.

Abstract: An example controller includes a constant current control circuit and an integrator included in the constant current control circuit. The constant current control circuit is to be coupled to receive an input current sense signal, an input voltage sense signal, and an output voltage sense signal. The control circuit is adapted to regulate an output current of a power supply by generating a control signal to control switching of a switch. The integrator is coupled to integrate the input current sense signal during a switching period of the control signal to generate an integrated signal representative of a charge taken from an input voltage source of the power supply. The constant current control circuit is adapted to control the switching of the switch such that the integrated signal is proportional to a ratio of the output voltage sense signal to the input voltage sense signal.

Abstract: Disclosed a switching power supply apparatus which includes a voltage converting transformer including an auxiliary winding on a primary side and a switching control circuit, wherein the switching control circuit includes a detection circuit to detect a falling edge of a terminal voltage of the auxiliary winding, and controls a switching transistor connected to a primary winding of the transformer based on the terminal voltage of the auxiliary winding at the time immediately before current flowing through a secondary rectifier diode of the switching power supply apparatus becomes zero, which terminal voltage is obtained based on a detection timing of the detection circuit.

Abstract: A self-oscillating flyback converter includes a controller integrated circuit housed in a 3-pin package. A switch control terminal is coupled to the base of an inductor switch that controls the current through a primary inductor of the converter. The controller IC adjusts the on time of the switch such that output current remains constant in constant current mode and output voltage remains constant in constant voltage mode. A signal received on a switch control terminal turns the switch off and provides an indication of the output current when the switch is on. A signal received on a feedback terminal powers the controller IC and provides an indication of the output voltage when the switch is off. The controller IC is grounded through a ground terminal. The flyback converter transitions from critical conduction mode to discontinuous conduction mode at light loads to prevent its efficiency from deteriorating at high switching frequencies.

Abstract: A device and method for non-contact transmission of electrical energy by means of a transformer (1) comprising at least a primary side (2) and at least a secondary side (8), and where resonance is set up in a circuit comprising the primary winding (4) of the transformer (1) and a capacitor (14) connected in series with the primary winding (4).

Abstract: A lamp driver circuit for operating a gas discharge lamp (La) is proposed, which comprises a switched mode power supply circuit (SMPS) and a first and a second output terminal (OT1, 0T2) for supplying a lamp current to the gas discharge lamp (La). The lamp driver circuit further comprises an output capacitor (CO) connected between the SMPS circuit and a ground terminal (GT) and comprises a resistive shunt (Rsh) connected between the ground terminal (GT) and the second output terminal (0T2) for determining the lamp current. An output current sensing circuit for determining a SMPS output current is comprised in the lamp driver circuit instead of a further resistive shunt, which would require a differential voltage measurement. The output current sensing circuit comprises a sensing resistor (RS) connected in series with a sensing capacitor (CS), the series connection being connected in parallel to the output capacitor.

Abstract: A control circuit for use in a power converter has a multi-function terminal, a current comparator circuit, and an under-voltage detection circuit. The current comparator circuit compares current flowing through a power switch of the power converter with a reference value through the multi-function terminal when the power switch is on, and turns the power switch off when the current reaches the reference value. The under-voltage detection circuit determines whether an input voltage of the power converter is less than a predetermined value through the multi-function terminal when the power switch is turned off.

Abstract: An adaptive inductive ballast is provided with the capability to communicate with a remote device powered by the ballast. To improve the operation of the ballast, the ballast changes its operating characteristics based upon information received from the remote device. Further, the ballast may provide a path for the remote device to communicate with device other than the adaptive inductive ballast.

Abstract: A system is provided for controlling two AC machines. The system comprises a DC input voltage source that provides a DC input voltage, a voltage boost command control module (VBCCM), a five-phase PWM inverter module coupled to the two AC machines, and a boost converter coupled to the inverter module and the DC input voltage source. The boost converter is designed to supply a new DC input voltage to the inverter module having a value that is greater than or equal to a value of the DC input voltage. The VBCCM generates a boost command signal (BCS) based on modulation indexes from the two AC machines. The BCS controls the boost converter such that the boost converter generates the new DC input voltage in response to the BCS.

Abstract: Provided is a transformer, comprising a first winding and a second winding that interlink with a main magnetic flux; and a third winding that interlinks with a magnetic flux leakage interlinking with only one of the first winding and the second winding.

Abstract: An example controller includes first, second and third inputs, a delayed ramp generator and a drive signal generator. The first, second and third inputs are coupled to receive an input voltage sense signal, an output voltage sense signal, and an input current sense signal, respectively. The drive signal generator is coupled to receive an input charge control signal generated by an input charge control signal generator and a delayed ramp signal generated by a delayed ramp generator. The input charge control signal is generated responsive to an integral of the input current sense signal multiplied by a ratio of the input voltage sense signal to the output voltage sense signal, where the drive signal generator produces a drive signal responsive to the input charge control signal and the delayed ramp signal, the drive signal to be coupled to control a switch of a power supply to regulate an output of the power supply.

Abstract: In one embodiment, a method of operating a switched-mode power supply that has a switch coupled to a drive signal is disclosed. The method includes deactivating the drive signal at a first instance of time, and comparing a power supply signal to a threshold after deactivating the drive signal. The method further includes activating the drive signal a variable period of time after the power supply signal crosses the threshold.

Abstract: A power converter controller is disclosed. An example power converter controller includes a feedback sensor circuit coupled to receive a feedback signal representative of an output of the power converter. The controller also includes a feedback sampling signal generator coupled to generate a feedback sampling signal coupled to be received by the feedback sensor circuit. The feedback sensor circuit is coupled to sample the feedback signal in response to the feedback sampling signal. The controller also includes a state machine coupled to the feedback sensor circuit to control switching of a switch of the power converter circuit according to one of a plurality of operating condition states in response to the feedback sensor circuit. The controller also includes a feedback time period signal generator coupled to generate a feedback time period signal coupled to be received by the state machine. A period of a feedback time period signal is substantially greater than a period of the feedback sampling signal.

Abstract: This invention is a multi-port power converter where all ports are coupled through different windings of a high frequency transformer. Two or more, and typically all, ports have synchronized switching elements to allow the use of a high frequency transformer. This concept and type of converter is known. This invention mitigates a number of limitations in the present art and adds new capabilities that will allow applications to be served that would otherwise not have been practical. A novel circuit topology for a four-quadrant AC port is disclosed. A novel circuit topology for a unidirectional DC port with voltage boost capabilities is disclosed. A novel circuit topology for a unidirectional DC port with voltage buck capabilities is disclosed. A novel circuit for a high efficiency, high frequency, bi-directional, AC semiconductor switch is also disclosed.