Abstract: A reactive power compensation apparatus includes one or more phase clusters each comprising a plurality of cells, and a controller controlling the one or more phase clusters. When at least one cell in a specific phase cluster among the one or more phase clusters is faulty, the controller controls a voltage of each cell in each of the remaining phase clusters except for the specific phase cluster to be controlled, using a modulation index.

Abstract: A control circuit for a switch mode power supply (SMPS) includes a power switch for coupling to a primary winding of the power supply and a startup resistor coupled to an external input voltage and to a control terminal of the power switch. The control circuit also includes a controller. During startup, the controller is configured to cause the power switch to amplify a startup current from an external input voltage through the startup resistor and provide a startup power to the controller. During normal operation, the controller is configured to provide a power switch control signal to turn on and off the power switch for controlling a current flow in the primary winding and regulating an output of the power supply. The controller is configured to provide a current signal for driving an NPN power switch and to provide a voltage signal for driving an NMOS power switch.

Abstract: A first switch and a second switch connected in series to both terminals of a DC power source. A signal generation circuit generates a feedback signal based on the DC voltage detected by the voltage detection circuit, and outputs the feedback signal, the feedback signal for turning the first and second switches on and off. A burst oscillation circuit that generates a burst oscillation signal based on a feedback signal and turns the first switch element and the second switch element on and off based on the burst oscillation signal when the standby state is detected. The burst oscillation circuit comprises a capacitor and a rapid charge circuit. When this device returns from standby state to normal state, the rapid charging circuit charges the capacitor after the feedback signal exceeds the cancellation threshold voltage.

Abstract: A power controller is provided. The power controller has a peak current setting unit utilized for deciding a peak current value according to a divided input voltage and a current limit turn-on time value. The comparator sends a first trigger signal once a current value of a power switch of the power system reaches the peak current value. The turn-on time calculation module defines the number of current limit operations by using the count of first trigger signals received in a calculation time period and then processes a recursive calculation to calculate a turn-on time value according to the current limit turn-on time value, the number of current limit operations, and a target number of current limit operations. The timer transmits a second trigger signal when the set turn-on time value is counted. The switch control module turns off the power switch when receiving one of the first and the second trigger signal.

Abstract: A power compensation apparatus compensates for power of a power system to be allowed to transmit from at least one or more power sources to a load. The power compensation apparatus includes a first system connected to the power system to compensate for active power and reactive power of the power system, a second system connected to the first system to store power necessary for compensating for active power and reactive power, and a third system connected to the second system to generate the power to be stored in the second system.

Abstract: The low input voltage boost converter with peak inductor current control and offset compensated zero detection provide a boost converter scheme to harvest energy from sources with small output voltages. Some embodiments described herein includes a thermoelectric boost converter that combines an IPEAK control scheme with offset compensation and duty cycled comparators to enable energy harvesting from TEG inputs as low as 5 mV to 10 mV, and the peak inductor current is independent to first order of the input voltage and output voltage. A control circuit can be configured to sample the input voltage (VIN) and then generate a pulse with a duration inversely proportional to VIN so as to control the boost converter switches such that a substantially constant peak inductor current is generated.

Abstract: The present disclosure is directed to a high power factor quasi resonant converter. The converter converts an AC power line input to a DC output to power a load, generally a string of LEDs. The power input is fed into a transformer being controlled by a power switch. The power switch is driven by a controller having a shaping circuit. The shaping circuit uses a current generator, switched resistor and capacitor to produce a sinusoidal reference voltage signal. The controller drives the power switch based on the voltage reference signal, resulting in a sinusoidal input current in a primary winding of the transformer, resulting in high power factor and low total harmonic distortion for the converter.

Abstract: A distributed power system that is connected to a utility grid during both daytime and nighttime includes a plurality of power supplies including a solar array, a non-isolated DC-DC converter that has an input terminal and an output terminal and raises, at a predetermined step-up ratio, a DC voltage input from the power supplies via the input terminal and outputs the DC voltage via the output terminal, an inverter that converts the DC voltage output from the DC-DC converter via the output terminal into an alternating current, and a potential adjustment section that adjusts a potential at a negative electrode of the solar array to a potential higher than a potential at a negative electrode of the inverter at least during nighttime.

Abstract: A regulator configured to provide at an output node a load current at an output voltage is described. The regulator comprises a pass transistor for providing the load current at the output node. Furthermore, the regulator comprises feedback means for deriving a feedback voltage from the output voltage at the output node. In addition, the regulator comprises a differential amplifier configured to control the pass transistor in dependence of the feedback voltage and in dependence of a reference voltage. The regulator further comprises compensation means configured to determine a sensed current which is indicative of the load current at the output node. Furthermore, the compensation means are configured to adjust an operation point of the regulator in dependence of the sensed current and in dependence of a value of a track impedance of a conductive track which links the output node to a load.

Abstract: A switching power supply includes a plurality of parallel branches, each parallel branch including two serially connected controllable switches and a coil connected between the two switches and an output node, a capacitor connected between the output node of the parallel branches and ground; and a controller configured to switch the two serially connected controllable switches of each parallel branch such that a first switch of a parallel branch is switched from a conducting state to a non-conducting state when a current flowing through a coil of the parallel branch reaches a first current value larger than 5 A, and such that the second switch is switched from a conducting state to a non-conducting state when the current flowing through the coil of the parallel branch reaches a second current value smaller than 0 A.

Abstract: A power converting device includes a first and a second power module electrically coupled in parallel, a loop current limiting circuit and a driving circuit. A first and a second terminal of the loop current limiting circuit are coupled to the first and the second power module respectively. A third and a fourth terminal of the loop current limiting circuit are coupled to each other. The loop current limiting circuit includes a coupled differential-mode inductor, a first inductive unit and a second inductive unit. A first winding and a second winding of the coupled differential-mode inductor are coupled to the first and the second power modules respectively. The first and the second inductive units are coupled to the first and the second power modules respectively. The driving circuit is configured to output a driving signal to the first and the second power module according to a current detecting signal.

Abstract: A controller for use in a power converter includes a current sense circuit to generate a current limit signal and an overcurrent signal in response to a source signal, a first sense finger signal, and a second sense finger signal. A control circuit is coupled to generate a control signal in response to the current limit signal and the overcurrent limit signal. A drive circuit is coupled to generate a drive signal with a multiple stage gate drive in response to the control signal. The drive signal in a first stage of the multiple stage gate drive is a weak turn on drive signal to turn a switch on slowly to reduce electromagnetic interference (EMI). The drive signal in a second stage of the multiple stage gate drive is a strong turn on drive signal to fully turn on the switch quickly to enable accurate current sensing of the switch.

Abstract: An overvoltage protection circuit adapted for a switching power supply is provided. The overvoltage protection circuit can use the time difference of the start of the overvoltage protection to distinguish that the overvoltage of the output voltage of the switching power supply is caused by the failure of the internal feedback or by the internal power supply, thereby avoiding a short and harmless external power supply to affect the normal operation of the switching power supply but can immediately stop the switching power supply to achieve protection when the switching power supply has an internal feedback failure.

Abstract: Certain aspects of the present disclosure generally relate a dual feedback loop regulator. For example, the regulator may include a first amplifier having an output coupled to an output node of the regulator, the output node further coupled to a first feedback path and a second feedback path of the regulator. A first input of a second amplifier may be coupled to the first feedback path and a second input of the second amplifier may be coupled to a reference path. The regulator may also include a transconductance stage having a first transistor and a first current source, the first transistor and the current source coupled to the first feedback path and the second feedback path, and a transimpedance stage coupled to the transconductance stage and an input of the first amplifier.

Abstract: A constant output circuit is disclosed that includes a power supply circuit, a LM-FOT control circuit, a switching circuit and a transformer. Output ends of the power supply circuit are respectively connected with a first input end of the LM-FOT control circuit and an end of a primary winding of the transformer. A controlling end of the LM-FOT control circuit is connected with a controlled end of the switching circuit. A second input end of the LM-FOT control circuit is connected with an output end of the switching circuit. An input end of the switching circuit is connected with the other end of the primary winding of the transformer. An end of a secondary line winding of the transformer is configured for outputting constant voltage signals. Another end of the secondary line winding of the transformer is grounded.

Abstract: Embodiments of a controller integrated circuit (IC) device for a switched mode power converter and a method of operating a controller IC device of a switched mode power converter are described. In one embodiment, a controller IC device for a switched mode power converter an input/output unit connected to an input/output node of the controller IC device and a controller unit. The input/output unit is configured to receive an input current from the input/output node and output an output voltage through the input/output node in response to an input voltage received at the input/output unit. The controller unit is configured to control voltage regulation of the switched mode power converter in response to the input current received from the input/output unit and generate the input voltage for the input/output unit. Other embodiments are also described.

Abstract: The present invention relates to a transient current and voltage protection device for electrical energy conversion systems connected to the power grid, comprising a diode bridge connected between the power grid and the power section of said inverter, upstream of the main filtering inductors.

Abstract: System and method for regulating a power converter. The system includes a comparator configured to receive a first signal and a second signal and generate a comparison signal based on at least information associated with the first signal and the second signal. The first signal is associated with at least an output current of a power converter. Additionally, the system includes a pulse-width-modulation generator configured to receive at least the comparison signal and generate a modulation signal based on at least information associated with the comparison signal, and a driver component configured to receive the modulation signal and output a drive signal to a switch to adjust a primary current flowing through a primary winding of the power converter. The modulation signal is associated with a modulation frequency corresponding to a modulation period.

Abstract: A power supply includes a boost converter, a capacitor, a step-down converter and a control unit. The boost converter, when activated, converts an input voltage into a boost voltage. The capacitor has a bulk voltage which is equal to the boost voltage when the boost converter is activated. The step-down converter converts the boost voltage into a step-down voltage for output. While the boost converter is deactivated, the control unit samples the input voltage and the bulk voltage, calculates an estimated value, and determines a calibration parameter. While the boost converter is activated, the control unit calculates a calibration value for enabling the boost converter to convert the input voltage with reference to the calibration value.

Abstract: A power supply having a primary side and a secondary side is disclosed. The power supply includes a main transformer having a first side and a second side. The first side is coupled to the primary side and the second side coupled to the secondary side. The power supply further includes a primary switch coupled to the first side and a synchronous rectification switch coupled to the second side. A controller is included for driving the primary switch and the synchronous rectification switch in several operation modes including the operation in continuous conduction mode. The controller is configured to determine and set a time between turning-off of the synchronous rectification switch and turning-on of the primary switch based on sampling of the peak voltage at the drain of the synchronous rectification switch and selecting the time that corresponds with the lowest peak voltage on the drain of the synchronous rectification switch.