Abstract: Apparatus and methods for programmable low dropout regulators for radio frequency (RF) electronics are provided herein. In certain configurations, a power amplifier system includes a multi-stage power amplifier that amplifies a radio frequency signal and includes a driver stage and an output stage. The power amplifier system further includes an envelope tracker that controls a supply voltage of the output stage in relation to an envelope of the radio frequency signal, and a programmable low dropout regulator that includes an output that provides a programmable supply voltage to the driver stage. The programmable low dropout regulator includes an output capacitor electrically connected to the output, a regulation transistor having a drain electrically connected to the output, and an alternative discharge circuit that discharges the output capacitor in response to programming the programmable supply voltage from a high voltage level to a low voltage level.

Abstract: A power conversion device includes a plurality of leg circuits and a control device. The plurality of leg circuits correspond to respective phases of an AC circuit and connected in parallel between common first and second DC terminals. Each leg circuit includes a plurality of chopper cells each including an energy storage and cascaded to one another and at least one inductance connected in series to the plurality of chopper cells. The control device controls an operation of only at least one chopper cell included in each leg circuit based on a circulating current which circulates through the leg circuits.

Abstract: To safely stop a system even when an abnormality occurs in a power supply for a control circuit, a semiconductor device includes a control circuit, a first power supply that outputs a first voltage to be supplied to the control circuit as a power-supply voltage, a first voltage monitoring circuit that determines whether the first voltage is abnormal, a first switch that is coupled to the first power supply and the control circuit, and cuts off supply of the first voltage to the control circuit when it is determined that the first voltage is abnormal, and a power-supply switching circuit that is coupled to the control circuit and a second power supply, which outputs a second voltage to be supplied to a circuit to which power supply is supplied other than the control circuit as a power-supply voltage, and supplies the second voltage to the control circuit in a state where the supply of the first voltage to the control circuit is cut off.

Abstract: The present disclosure relates to frequency control of power conversion modules for decreasing THD (Total Harmonic Distortion) in a power conversion device in which a plurality of power conversion modules operate in parallel. In one aspect of the present disclosure, an embodiment provides a power conversion device comprising a plurality of power conversion modules being connected in parallel to receive input power and provide output AC power, and a frequency controller controlling each operating frequency of the plurality of power conversion modules, wherein, the frequency controller may include a function as a first frequency regulating step for regulating each operating frequency of the plurality of power conversion modules, so that the operating frequencies of the plurality of power conversion modules have a specific relationship with each other.

Abstract: The inverter includes an inverting module including a plurality of switching elements, wherein the inverting module are configured for receiving a direct current (DC) stage voltage and for generating an output voltage of three-phases via switching of the switching elements. The device includes: a command voltage outputting unit configured for providing a pulse width modulation (PWM) control signal corresponding to an initial command voltage to the switching elements of the inverting module when the initial command voltage is within a voltage limit; a modulation index modifying unit configured for modifying a modulation index of the initial command voltage when the initial command voltage is outside the voltage limit; and an overmodulated command voltage generation unit configured for modifying the initial command voltage using the modified modulation index to form a modified command voltage and for limiting the modified command voltage to the voltage limit to generate an overmodulated command voltage.

Abstract: A solution is provided for suppressing audio noise in a DC-DC switching converter. A means for limiting the minimum switching frequency of a pulse-frequency modulation (PFM) control is described. A first order gm amplifier dissipates the excess energy added to the inductor, when magnetizing at faster rate than the native PFM. A higher resistance, low-side scaled switch helps reduce wasted energy losses. The low-side scaled switch reduces the rise in the inductor current during magnetization, and hence keeps efficiency up at low loads, when the PFM minimum switching frequency is active.

Abstract: The present invention relates to an apparatus for controlling an output voltage for a single-type converter and a method therefor, the apparatus including: a power input/output unit connected in parallel to both poles of the single-type converter, respectively, thereby receiving and outputting output voltages, respectively; an output voltage and current measurement unit measuring output currents and the output voltages output from the power input/output unit; a controller performing a current limit control for a protection coordination for a first pole and performing a voltage control for a second pole following a checking of a state of the first pole of the both poles of the single-type converter using the measured output currents; a switching unit being switched according to a control performed on the both poles; and a power transfer unit transferring the output voltages of the single-type converter according to switching of the switching unit.

Abstract: A bandgap reference circuit and a high-order temperature compensation method are disclosed. The bandgap reference circuit includes: a starting circuit, a bias circuit and a high-order compensated bandgap reference voltage generating circuit, where a compensation method of the high-order compensated bandgap reference voltage generating circuit is to perform curvature correction by using a sub-threshold current of a CMOS transistor to obtain a high-order temperature-compensated bandgap reference voltage source circuit. The present circuit has the advantages that a manner not increasing circuit complexity can be adopted for implementation, the accuracy of a bandgap reference source can be greatly improved, and power consumption, chip area and cost are reduced.

Abstract: A DC-DC converting controller, coupled to an output stage including a phase node and an operation switch coupled between the phase node and a ground voltage, includes a pulse-width modulation (PWM) unit, a zero-level comparator and a threshold voltage generation unit. The PWM unit, coupled to the output stage, provides the PWM signal to the output stage for controlling the operation switch. The zero-level comparator has a first input terminal, a second input terminal and an output terminal. The first input terminal is coupled to the phase node. The output terminal, coupled to the PWM unit, provides a zero-current voltage to adjust the PWM signal. The threshold voltage generation unit, coupled to the phase node and zero-level comparator, provides the threshold voltage to the second input terminal. The threshold voltage generation unit dynamically adjusts threshold voltage according to a default voltage and the phase voltage on the phase node.

Abstract: A load adaptive power supply including: a conducting resistance controllable bridge rectifying unit for generating a full-wave rectified output voltage according to an AC input voltage to drive a load, and controlling an on-resistance thereof during at least one half cycle of a positive half cycle and a negative half cycle of the AC input voltage according to at least one control signal; a driving circuit unit configured to generate the at least one control signal according to a pulse modulation signal; and a digital microcontroller unit coupled with the driving circuit unit to determine a duty ratio of the pulse modulation signal according to a power of the load to drive the driving circuit unit, so as to adjust the on-resistance of the conducting resistance controllable bridge rectifying unit according to different values of the power, thereby increasing a power conversion efficiency of the power supply.

Abstract: A flyback converter is provided, which includes a transformer comprising a primary winding and a secondary winding, the transformer for transforming a power inputted from an input power supply and outputting the transformed power, a switching part having one end connected to the primary winding and the other end connected to the input power supply, and an auxiliary circuit including an auxiliary capacitor, and an auxiliary winding coupled to the primary winding. In addition, a clamping diode and a two-series connected switch structure is utilized for the switch stage to relieve the voltage stress of the switch. Accordingly, it is possible to reduce the voltage stress of the switch and also reduce the ripple of the input current which are the causes of EMI.

Abstract: An interleaved LLC half-bridge series resonant converter having an integrated transformer includes a power supply, a magnetic core, a first converter, a second converter and an output load circuit. The magnetic core has first and second outer columns and a center column. The first converter includes a first switch circuit, a first resonant tank, a first transformer, and a first rectifier circuit. The first transformer is coupled to the first resonant tank and includes a first primary winding wound on the first outer column and a first secondary winding wound on the second outer column. The second converter includes a second switch circuit, a second resonant tank, a second transformer and a second rectifier circuit. The second transformer is coupled to the second resonant tank and includes a second primary winding wound on the first outer column and a second secondary winding wound on the second outer column.

Abstract: The disclosure relates to power electronics technology and aims to provide a control method of constant-voltage-gain isolation type bidirectional full-bridge DC/DC converter, which is based on a single-phase-shifting modulation method. By enabling the difference between the M times of the input voltage and primary-referred value of the output voltage to be constantly zero, to realize the control goal that the ratio value between the primary-referred value of the output voltage and the input voltage is constantly M; the ratio value between the primary-referred value of the output voltage and the input voltage is defined as the voltage gain M, wherein an adjusting range is 0.5˜2; through introducing a feedforward compensator involving the input and output voltages and the input and output currents, a linear controller of the system is implemented.

Abstract: A power converter includes a power converting circuit, a high-voltage control circuit, a low-voltage control circuit, and a driving circuit. The power converting circuit is configured to receive and convert a HVDC voltage from a high-voltage side to a LVDC voltage to a low-voltage side. The high-voltage control circuit is coupled to the high-voltage side and configured to detect the HVDC voltage and output a first control signal according to the HVDC voltage. The low-voltage control circuit is coupled to the low-voltage side and configured to detect the LVDC voltage and output a second control signal according to the LVDC voltage. The driving voltage is configured to selectively output a driving signal to drive the power converting circuit according to the first or the second control signal.

Abstract: An electric power converter includes a plurality of branches of switch units. A first stage, a second stage and a third stage of the converter are connected in series. The first stage includes first positive and negative branches, which are connected between a first output node and two first input nodes. The second stage includes three input nodes and positive and negative cells, each connected between a first input node and two second input nodes. The third stage includes third positive intermediate and negative branches, connected between the three second input nodes and three third input nodes. Capacitors are connected between the three second input nodes and between the three third input nodes.

Abstract: A voltage regulator includes an error amplifier which receives a feedback voltage and a reference voltage and thereby controls a gate voltage of an output transistor, a non-regulation detection circuit having a differential amplifier circuit operating on a current corresponding to an output current of the output transistor, and an overshoot suppression circuit having an overshoot detection circuit which enables an overshoot detection by a signal indicating the detection of non-regulation state from the non-regulation detection circuit.

Abstract: A device and method for controlling an inverter is disclosed. The inverter-controlling device in accordance with the present disclosure determines an operation state of a switching element of an initial charging module based on predetermined time durations and a magnitude of a DC link voltage measured at each of time points corresponding to the predetermined time durations.

Abstract: A synchronous rectification controller includes: a drain terminal connected to a drain of a synchronous rectification transistor; a first comparator configured to compare a drain voltage of the drain terminal with a first threshold voltage; a second comparator configured to compare the drain voltage of the drain terminal with a second threshold voltage; a flip-flop to which an ON signal output from the first comparator and an OFF signal output from the second comparator are input; a driver configured to output a gate signal to the synchronous rectification transistor based on an output signal of the flip-flop; and a threshold adjusting part configured to adjust the second threshold voltage based on the drain voltage.

Abstract: Each of a plurality of specified chopper cells which are some of a plurality of chopper cells included in each leg circuit in a power conversion device is configured as a full bridge. A control device controls operations of first and second switching elements of each specified chopper cell based on a circulating current which circulates through each leg circuit. The control device controls operations of third and fourth switching elements of each specified chopper cell based on a voltage of a capacitor of the specified chopper cell.

Abstract: A DC/DC converter enabling a step-up operation and a step-down operation in a bidirectional power transmission, and capable of adjusting transmission power amount with a good response. A DC/DC converter decreases a first phase shift amount and increases a second phase shift amount, as a first transmission power amount increases, when a first transmission power amount is larger than a first reference point.