Abstract: Nonlinear control method for the micro-grid inverter with anti-disturbance. By generating reference currents that satisfy specific active and reactive power command under various working conditions, and introducing a nonlinear control method based on Lyapunov function to control the inverter, fast and accurate tracking of the generated reference signals is realized. The method realizes effective decoupling control of active power and reactive power. The system has high dynamic response and good robustness. Besides, the control structure of the method is simple and easy to implement, and the synchronous control link and the additional voltage and current regulator are omitted. The method realizes fast and accurate power exchange and stable power transmission between the inverter and the grid in the micro-grid under various working conditions, and provides a guarantee for improving the energy management efficiency within the micro-grid.

Abstract: A switching power converter and a method for receiving an input power at an input node and outputting an output power at an output node is presented. The switching power converter has a high-side switching device coupled between the input node and the output node, a low-side switching device coupled between the input node and a predetermined voltage level, and an active snubber circuit for suppressing voltage peaks at the input node. The active snubber circuit has a first capacitor coupled to the output node. The first capacitor is charged during a first dead time after the low-side switching device has been switched OFF and before the high-side switching device is switched ON.

Abstract: A control circuit is configured to sense an AC input voltage of a power factor correction (PFC) power circuit in a switching power converter, provide a control signal having an on-time and an off-time to at least one power switch of the PFC power circuit, and in response to detecting a peak voltage of the AC input voltage, increase the on-time of the control signal based on the sensed AC input voltage during an interval that begins with the peak voltage of the AC input voltage and ends with the next zero crossing following the peak voltage of the AC input voltage to improve a power factor of the switching power converter. Other example switching power converters, PFC power circuits and control circuits for controlling one or more power switches are also disclosed.

Abstract: A power supply circuit includes: an alternating current-to-direct current (AC-to-DC) converter, a transformer, a first current switch, a switch control circuit and a power factor enhancement circuit. The AC-to-DC converter converts an AC power signal into a DC power signal. The transformer includes a primary side and a secondary side, where a first terminal of the primary side is coupled to the AC-to-DC converter, a second terminal of the secondary side is coupled to a ground voltage level, a first terminal of the first current switch is coupled to a second terminal of the primary side, and a second terminal of the first current switch is coupled to the ground voltage level through an impedance component. The power factor enhancement circuit selectively adjusts a zero current detection voltage to make the switch control circuit set the first current switch to be in a conducting state.

Abstract: A power stage output node stabilizer may be used to reduce ringing of a power stage output node of a switching DC-DC power converter. The power stage output node stabilizer may be a network of resistors and switches coupling the power stage output node to a higher voltage level and a lower voltage level.

Abstract: A comparator circuit includes a first comparator arranged to compare an input signal with a reference voltage so as to generate a first comparison signal, a second comparator arranged to compare the input signal with a variable reference voltage so as to generate a second comparison signal, a variable reference voltage generator arranged to generate the variable reference voltage, and a logic unit arranged to output one of the first comparison signal and the second comparison signal as a comparison signal. The logic unit outputs the first comparison signal as the comparison signal while controlling the variable reference voltage generator to sweep the variable reference voltage until the first comparison signal and the second comparison signal exhibit desired response behaviors, and moves to a state capable of outputting the second comparison signal as the comparison signal after the sweep of the variable reference voltage is completed.

Abstract: A control method of multi-phase converters, wherein the multi-phase converter includes a plurality of switching circuits coupled in parallel between an input voltage and a load. The control method includes: comparing a feedback signal with a reference signal to generate a comparison signal, wherein the feedback signal is indicative of an output voltage provided to the load; determining the number of switching circuits for power operation based on the load current; detecting a period of the comparison signal; comparing the detected period of the comparison signal with a time threshold to determine whether a transient rise of load current has occurred; and getting all the switching circuits into power operation if a transient rise of load current is detected.

Abstract: A method for protecting a power switch during turn-on includes sensing that a change in current through the power switch is in regulation, measuring a time that the change in current through the power switch is in regulation, and comparing the time that the change in current through the power switch is in regulation to a reference time. An over current signal, which can be used to disable the power switch, is generated if the time that the change in current through the power switch is in excess of the reference time.

Abstract: A combined alternating current (AC) and direct current (DC) power converter is disclosed. In embodiments, the power converter includes an electromagnetic interference (EMI) filter, a bridge rectifier, and a boost converter. The EMI filter is configured to receive an electrical signal from a power source. The bridge rectifier is coupled to the EMI filter and includes at least four diodes arranged in a diode bridge configuration. The boost converter is coupled to the bridge rectifier and includes a switched DC path and a switched AC path. The switched DC path includes a DC transistor and the switched AC path includes an AC transistor. The switched AC path can also include one or more diodes and/or switching elements.

Abstract: A voltage comparator for detecting a voltage difference in a high-voltage domain, wherein said comparator receives an input voltage and compares it with a reference voltage also received in input, in which the output voltage from the comparator assumes the logic value 1 if the input voltage is greater than the reference voltage and assumes the logic value 0 if the input voltage is less than or equal to the reference voltage, wherein said comparator comprises low-voltage components and a single high-voltage component. In particular, the low-voltage components are MOS transistors and the high-voltage component is a high-voltage PMOS.

Abstract: A system that includes a regulator unit is disclosed. The regulator unit includes first and second phase units whose outputs are coupled to through first and second coupled inductors, respectively, to a power supply node of a circuit block. The first phase unit may be configured to discharge, for a first period of time, the power supply node through the first inductor in response to determining a sense current is greater than a demand current. The operation of the second phase unit may follow that of the first phase unit after a second period of time has elapsed.

Abstract: A switching control circuit includes a first current source, a second current source, a first switch disposed between the first current source and a gate of a switching element, and a second switch disposed between the second current source and the gate of the switching element. The first switch and the second switch are complementarily turned on and off according to a pulse signal. At least one of a value of current supplied to the gate of the switching element from the first current source when the first switch is turned on, and a value of current that flows out from the gate of the switching element to the second current source when the second switch is turned on, is changed periodically.

Abstract: An apparatus is disclosed for improving zero voltage switching (“ZVS”) of a converter circuit such as an active clamp flyback converter. The apparatus includes a first timing circuit acting as the TD(L-H) optimizer, which uses the zero-crossing of the auxiliary winding voltage directly to adaptively vary the dead time. A second timing circuit acting as the TD(H-L) optimizer adaptively varies the dead time with a simple piece-wide linear function as an approximation of the complex optimal equation. A third timing circuit acting as the TDM optimizer contains a charge-pump circuit that adaptively adjusts the ON time of the clamp switch based on the zero-voltage detection of switching node voltage and feed-forwards the input voltage signal to enhance tuning speed so that the correct amount of negative magnetizing current is generated to improve zero voltage switching.

Abstract: A step-up converter includes a first inductance electrically connecting a first DC voltage input of the step-up converter to a first junction point, a step-up converter switch connecting the first junction point to a second DC voltage input and a second DC voltage output of the step-up converter, a first diode connecting the first junction point to a first DC voltage output of the step-up converter, and a snubber circuit comprising a charging path and a discharging path. The discharging path runs as a series connection of a capacitor and a second diode from the first junction point to the first DC voltage output, and the charging path is connected at its one end to a junction point between the capacitor and the second diode and is arranged such that the capacitor is charged when the step-up converter switch is switched on.

Abstract: A buck converter includes a power switch having a first end to receive an input voltage, and a soft start circuit configured to compensate a soft start voltage during a soft start time period according to a result of comparing a feedback voltage corresponding to an output voltage of the buck converter and an input detection voltage corresponding to the input voltage. The buck converter controls switching of the power switch using the soft start voltage.

Abstract: An output voltage calibration circuit and technique is disclosed to increase the accuracy and precision of the constant-voltage mode for a flyback converter.

Abstract: Unique systems, methods, techniques and apparatuses of a modular power transformer are disclosed. One exemplary embodiment is a matrix power transformer including a plurality of block assemblies each including a plurality of transformer modules, each transformer module including a primary winding coupled to an input and a secondary winding coupled to an output, the inputs of each transformer module in one block assembly being coupled together and the outputs of each transformer block being coupled together. One of the secondary windings includes a plurality of taps structured to be selectively coupled to the output of the associated transformer module assembly or another secondary winding of the associated module assembly.

Abstract: Aspects of the disclosure provide a voltage converting system. The voltage converting system includes a first power converter configured to convert an input voltage to an intermediate voltage, a second power converter configured to convert the intermediate voltage to an output voltage at a target voltage level, and a control circuit coupled to the first power converter and the second power converter. The control circuit is configured to, upon detection of the input voltage having a voltage level that is within a first range, perform a close-loop control of the second power converter to output the output voltage at the target voltage level.

Abstract: A method for controlling at least two three-phase power converters with asynchronous pulse-width modulation. The method further comprises the following steps: for each phase of each converter, the characteristics of the signals used to generate the modulating signal and carrier signal of each control signal of each phase of each converter are determined, for each converter, a phase shift is inserted between the carrier signals used to generate the phase control signals of the converter, for each phase, a phase shift is inserted between the carrier signals used to generate the control signals of the converters, for each phase of each converter, a pulse-width modulation control signal by intersection is determined resulting from the intersection of a modulating signal and a carrier signal, and the control signals are transmitted to the converters.

Abstract: A power supply control device for a communication network includes: a monitoring module (11) and N voltage-adjustable Direct Current/Direct Current (DC/DC) modules (121, 122 . . . 12N). The monitoring module is configured to detect circuit data of each of power supply circuits (1,2, . . . i), compare the circuit data with each other, calculate an average value, analyze required output circuit data of each of the power supply circuits, and transmit the required output circuit data of the power supply circuits to respective the voltage-adjustable DC/DC modules. The voltage-adjustable DC/DC modules are configured to receive the required output circuit data of the power supply circuits, and adjust output voltages of the power supply circuits according to the output circuit data. Output ends of all of the voltage-adjustable DC/DC modules are connected in parallel to supply power to a subordinate electro-load. Also disclosed is a power supply control method for the communication network.