Abstract: In some examples, an apparatus includes: a ramp generation circuit having a ramp control input and a ramp output, the ramp control input coupled to a power factor correction (PFC) output terminal; a comparator having a comparator output and first and second comparator inputs, the first comparator input coupled to the ramp output, the second comparator input coupled to a PFC switch current sensing terminal; and a pulse width modulation (PWM) generation circuit having a PWM control input and a PWM output, the PWM control input coupled to the comparator output, and the PWM output coupled to a PFC switch control terminal.

Abstract: A DC/DC converter may be formed out of the combination of a first converter that is optimized to transfer energy from a voltage source to a load, and a second converter that receives a control signal derived from the load voltage to regulate the load voltage. The DC/DC converter may be configured as a sigma converter, a delta converter, or a sigma-delta converter. The mode of operation being selected according to the source voltage or the load voltage, either of which may vary over a wide range.

Abstract: A control device of a power factor correction circuit disposed in a power supply device that generates a direct-current output voltage from an alternating-current voltage applied to a power supply terminal pair, the power factor correction circuit including an inductor that is disposed between a full-wave rectification circuit that generates a full-wave rectified voltage by carrying out full-wave rectification of the alternating-current voltage and an output interconnect line to which a smoothing capacitor is connected and to which the output voltage is applied, and is inserted between the full-wave rectification circuit and the output interconnect line, and a switching element for controlling an inductor current that flows in the inductor. The control device controls a state of the switching element based on a pulsating voltage obtained by rectifying a voltage between the power supply terminal pair and the full-wave rectification circuit and a feedback voltage according to the output voltage.

Abstract: A system may include a power converter configured to receive an input voltage and generate an output voltage and a controller configured to control operation of the power converter based on a comparison of a current associated with the power converter to a threshold current and control the threshold current as a function of the input voltage.

Abstract: A phase-shifted full-bridge converter and a control method thereof are disclosed. The proposed control method of a phase-shifted full-bridge converter, wherein the phase-shifted full-bridge converter includes a full-bridge switching circuit having a first and a second output terminals, a main transformer having a primary winding and coupled to the switching circuit, and an autotransformer having a primary winding and coupled to the main transformer, includes providing an induced common current flowing through the primary winding of the autotransformer; and causing the induced common current being reflected to the primary winding of the main transformer to cause a primary side current flowing through the primary winding of the main transformer to increase both slopes of a valid duty cycle and a dead-zone period such that the primary side current has a relatively lower transition level and a relatively shorter transition time.

Abstract: In order to restrain damage of a component due to rush current, a main relay in a power source circuit is not turned on and does not conduct a power source line even when a heat source microcomputer is activated with a capacitor not sufficiently charged. This configuration avoids start of charging the capacitor without current limitation, to restrain damage of the component due to rush current.

Abstract: The present invention disclosed a bridge rectifier comprising a first switching circuit, a second switching circuit, a third switching circuit, a fourth switching circuit, a first driving circuit, a second driving circuit, a third driving circuit, and a fourth driving circuit. The first driving circuit is electrically connected to the first switching circuit, the second driving circuit is electrically connected to the second switching circuit, the third driving circuit is electrically connected to the third switching circuit, the fourth driving circuit is electrically connected to the fourth switching circuit. In the disclosure, the bridge rectifier should be implemented by the combination of switch circuits with driving circuits. Such that the power dissipation of bridge rectifier could be significantly reduced to improve the function of the overall circuit due to the low impedance of the switching circuit in a closed state.

Abstract: Disclosed is a three phase Vienna converter for converting three phase AC to DC, with active power factor control. Further the control electronics is galvanically isolated from the neutral of the input three phase supply and also from the center terminal of the two series connected output DC filter capacitors. The control circuit is built completely with analog devices to meet stringent electromagnetic interference standards. The converter is capable of operating over a wide range of voltages and frequencies of the input supply voltage.

Abstract: An example relates to a method for operating a converter comprising a primary side of a transformer and a secondary side of the transformer, wherein a switching element is used for conveying energy from the primary side to the secondary side, the method comprising (i) determining a voltage drop across the primary side of the transformer; (ii) determining at least one additional voltage drop across at least one component of the converter's primary side; and (iii) determining an input voltage at the converter via the voltage drops.

Abstract: The present invention discloses a standby power supply circuit for a 2-wire bus intercom system and an apparatus thereof. The standby power supply circuit is separated into two power supply modules; in which the first power supply module is a power supply to standby circuit and the second power supply module is a power supply to operation circuit; said power supply to operation circuit is switched off by a constant current switch when the device load is at the standby status; and said power supply to standby circuit comprises a constant current circuit whose alternating current impedance is very large. The solutions of the present invention achieve larger alternating current impedance for the 2-wire intercom system, which can offer sufficient power for many device loads both in the conditions of operation and standby statuses.

Abstract: A boost switching regulator incorporates a ripple injection circuit to generate a voltage ripple signal for feedback control that mimics the actual ripple signal of the regulated output voltage. In this manner, the ripple injection circuit achieves optimal ripple injection for stable and enhanced feedback control. In one embodiment, the injected ripple signal is generated from a current injection signal that mimics the difference between the inductor current that flows through the synchronous rectifier and the load current when the synchronous rectifier is on. The injected voltage ripple signal is generated when the current injection signal is integrated by a feedforward capacitor.

Abstract: In one embodiment, a method of driving a load can include: monitoring an AC input to a rectifier circuit in real-time, where the rectifier circuit can include first and second rectifier circuits, and controlling first and second controllable switches based on a state of the AC input is in a first state. For example, a first state can include the AC input being in a positive half cycle and increasing, or the AC input being in the positive half cycle and decreasing while being at least as high as a predetermined threshold value. The AC input can be used to supply power to a load circuit and an output capacitor via the first rectifier circuit when the AC input is in the first state, where the first rectifier circuit can include a first diode and the second controllable switch.

Abstract: A switching power supply that conducts switching of an input voltage by a switching element to obtain a specified output voltage includes: an ON width controlling component that controls an ON width of the switching element; a zero current detecting component that detects zero current through the switching element to turn ON the switching element; a frequency reducing component that delays a turn ON timing of the switching element upon detection of a light load condition by a load condition detecting component to reduce a switching frequency of the switching element; and an AC period detecting component that detects a period of the input voltage to hold the load condition detected by the load condition detecting component over every period detected by the AC period detecting component.

Abstract: An AC-DC converter includes two series circuits, an inductor, and a common snubber circuit. Each series circuit includes a switch and a current block device. The block device blocks a current from its high potential side to its low potential side when the first device is closed and allows the current from the low potential side to the high potential side when the first device is opened. The inductor is interposed between a first connection point between the switch and the block device of one series circuit and a second connection point between the switch and the block device of the other series circuit. The common snubber circuit is connected between each of the first connection point and the second connection point and at least one of both ends of the one series circuit.

Abstract: Embodiments provide a magnetic flux conversion device (MFCD) that may produce a regulated output signal with a target value (e.g., target voltage and/or target current) from a source signal on a power line. The MFCD may include a secondary stage configured to be inductively coupled with the power line. The source signal may cause a secondary electrical signal to flow in the secondary stage. A regulator module may be coupled to the secondary stage and configured to produce the output signal with the target value across output nodes by sensing the output signal and shunting the secondary stage if a value of the output signal is above the target value.

Abstract: A standby power reducing module according to an embodiment includes a AC rectification unit; a resonance unit electrically connected to the AC rectification unit and dropping DC voltage; a microcomputer connected to the resonance unit and controlling all operations of a system; a power blocking unit electrically connected to the microcomputer and blocking output voltage of the resonance unit when the system is switched into standby mode; and a independent power supplying unit supplying the standby power to the microcomputer when the system is switched into the standby mode.

Abstract: A rectifier transformer including at least one secondary with windings, one pair of magnetic transductors per winding, one of the transductors having one or more first busbars and the other having one or more second busbars. All of the busbars of the pair of transductors are connected to the same winding. The or each first or second, busbar is connected to a single positive or negative, terminal (2w+) designed to be connected to a positive or negative, arm of the rectifier. All of the busbars of the pair of magnetic transductors form one or more groups that are encircled by at least one magnetic toroid and that comprise at least one first busbar and at least one second busbar, so that, when the terminals are short-circuited, the busbars of a group pass currents of opposite directions such that the sum of the currents in one direction is equal to the sum of the currents in the other direction.

Abstract: A rectifying apparatus (power receiving apparatus) 100 is configured to receive electric power output from the power transmitting apparatus 101. The rectifying apparatus 100 is mobile equipment, such as a battery, a smartphone incorporating a battery and a tablet PC, or equipment for a battery charger connected to the equipment. The rectifying apparatus (power receiving apparatus) 100 may be any other equipment that receives electric power output from the associated power transmitting apparatus 101, including a rechargeable electric car, a household appliance and a product for underwater application.

Abstract: A power supply unit for a press machine having a converter (converter circuit) connected to a commercial AC power supply, and an inverter (inverter circuit) connected to a press motor, includes an electrical energy bank, an inrush prevention circuit, an inrush prevention instruction signal generation section, and a contactor switch section, wherein contactors of the inrush prevention circuit are switched from on ON state to an OFF state and inrush prevention resistors of the inrush prevention circuit are connected to AC phase current paths on condition that the inrush prevention instruction signal generation section has generated and output an inrush prevention instruction signal (Sres) during press operation.

Abstract: A circuit to improve the power factor of a power supply at light load, the circuit including a rectifier bridge, a filter positioned before or after the rectifier bridge, a logic control and power drive circuit, a switching transistor, a light load detecting circuit configured to output a control signal to the logic control and power drive circuit which controls the switching transistor to conduct when a heavy load is experienced and to cut off when a light load is experienced, in order to control the working status of the filter capacitor, and a power factor correction circuit.

Abstract: High voltage DC power, which is produced by rectifying AC power generated by an AC generator, is controlled and regulated without the need for measuring the position of the rotor with hardware. A Field oriented controller uses a sliding mode observer to estimate the position of the rotor without the use of position detection hardware. The estimated position of the rotor and the AC current are then used by the field oriented controller algorithm to regulate a DC output from a rectifier driven by an AC generator.

Abstract: An AC to DC converter for converting an AC input voltage to a regulated DC output voltage using a Z-type converter and rectified switches. The Z-type converter includes first and second inductors, a capacitor, two rectified switches and a load device coupled in a cross-coupled configuration. The Z-type converter may be configured according to a Z-source or a quasi-Z-source rectifier network. The AC input voltage is applied to an input and the DC output voltage is developed across the load device. Each rectified switch may be configured as a series-coupled diode and electronic switch or as a dual gate GaN device with a shorted gate. A control network monitors the DC output voltage and develops a control signal for controlling the first and second rectified switches to regulate the DC output voltage. The control network may control the rectified switches based on duty cycle control or current mode control.

Abstract: A power converting device is disclosed that can reduce switching loss occurring in a voltage source inverter that drives an AC motor. It is possible to supply DC power to the voltage source inverter from both a voltage source rectifier, which converts AC power from an AC generator into DC power, and a battery. A first switching circuit is inserted between the voltage source rectifier and the AC generator, and the battery is connected to the output side of the voltage source rectifier. A second switching circuit is inserted between the battery and the voltage source inverter. A third switching circuit and a reactor are inserted in series between the input side of the voltage source inverter and the input side of the voltage source rectifier. At least one of an upper arm and a lower arm of the voltage source rectifier can be chopper controlled.

Abstract: A dimming power supply includes a power source, a transformer, a full bridge rectifier and a control switch.

Abstract: The commutator for a bridgeless PFC circuit is characterized in that a synchronous half-wave rectifier is connected between a bridgeless PFC boost circuit and an AC power source and is coupled to the two terminals of the AC power source. The synchronous half-wave rectifier contains a first synchronous transistor, a second synchronous transistor, and a control circuit.

Abstract: A power adapter to supply power at an output. The power adapter has a programmable gain compensation trim function. In some examples, the gain compensation trim function is a negative gain compensation trim function, and the output of plural power adapters are connected together to form a power supply.

Abstract: A power supply input device including a first resistance of a discharge resistance conversion unit connected in parallel to a discharge resistance unit; and a switching unit of the discharge resistance conversion unit connected to the first resistance and performing a switching operation according to an externally received control signal, thus minimizing power losses occurring when a system is in a standby mode.

Abstract: According to one embodiment, a power conversion apparatus determines a peak value of circuit current in each pulse cycle, from a corrected output voltage value by subtracting a predetermined reference voltage from an output voltage detected by the output voltage detector, and an input voltage detected by the input voltage detector. The pulse signal output unit outputs a pulse signal to the first switch when the polarity of input voltage is positive, and outputs a pulse signal to the second switch when the polarity of input voltage is negative. A pulse signal turns on in synchronization with a clock signal input from the oscillator, and is kept on until the circuit current detected by the circuit current detector reaches the peak value. A pulse signal turns off when the circuit current reaches the peak value, and turns on again in synchronization with the next clock signal.

Abstract: An exemplary non-isolated DC-DC converter for a solar power plant, can be adapted to connect to a full-bridge inverter. The converter includes positive and negative input terminals, and positive and negative output terminals. A plurality of switches, diodes, inductors and capacitors are connected in a circuit configuration to the input and output terminals. A control means is connected to the circuit for controlling the switching of a first, second, and third switch between an open and closed state.

Abstract: A power converter stabilizes a voltage by controlling leading of an AC current and performs maximum charging within contracted power reception amount when connected to a weak power system. The power converter comprises Magnetic Energy Recovery Switch comprising a bridge circuit including at least two reverse conductive type semiconductor switches and a magnetic energy accumulating capacitor with a small capacity connected between DC terminals of the bridge circuit. The power converter uses the Magnetic Energy Recovery Switch to perform power conversion from AC to DC or vise versa. Plurality of secondary battery charging devices each comprising the power converter have a DC part connected to a common DC bus bar, so that power is accommodated among the secondary battery charging devices.

Abstract: A two-phase critical interleave PFC boost converter, includes a master-side control circuit configured to critically control a first switching element based on a master signal; and a slave-side control circuit configured to critically control a second switching element based on a slave-signal with a phase difference of 180° from the master signal. In the PFC boost converter, an off period generator of the master-side control circuit feeds an M_ON signal which is the same in waveform as the master signal to an on phase controller of the slave-side control circuit, and the slave-side control circuit determines the rising timing of the slave signal from the rising time of the master signal.

Abstract: A power supply apparatus includes a first power factor correction circuit, a second power factor correction circuit and a control circuit that includes a first switching control unit that outputs a first switching signal for controlling a first switching element of the first power factor correction circuit generated in accordance with a detected result by an output voltage of the first power factor correction circuit and a current flowing through the first switching element, and a second switching control unit that outputs a second switching signal for controlling a second switching element of the second power factor correction circuit generated in accordance with a detected result by an output voltage of the second power factor correction circuit and a current flowing through the second switching element.

Abstract: A phase detection system includes a low-resolution sensor and a high-resolution sensor for monitoring an alternating current (AC) voltage. A phase detector receives voltage samples from both the low-resolution sensor and the high-resolution sensor. The phase detector monitors the low-resolution sensor to detect approaching zero cross events (i.e., monitored voltage values approaching zero). In response to an approaching zero-cross event, the phase detector uses the magnitude of the high-resolution voltage samples measured on either side of the zero cross event to determine the phase of the monitored AC voltage.

Abstract: A circuit includes an antenna terminal for generating a current through electromagnetic induction. The circuit also includes a rectifier for receiving the current and generating a rectified power supply voltage. In addition, the circuit includes a voltage clamp for sinking at least some of the current from the antenna terminal based on the rectified power supply voltage from the rectifier. The voltage clamp could include a control circuit (such as an N-channel transistor and a resistor) for controlling the sinking of at least some of the current from the antenna terminal. The voltage clamp could also include a sink circuit (such as an N-channel transistor) for sinking at least some of the current from the antenna terminal. The voltage clamp could further include a sink control circuit (such as a P-channel transistor and a resistor) for activating and deactivating the sink circuit based on operation of the control circuit.

Abstract: A dimming power supply includes a power source, a full bridge rectifier with four nodes, a control switch and a controller. The first node is connected to the power source, the second is connected to a load output, and the third is connected to a reference voltage node. The control switch is connected between the fourth node and the reference voltage node. The controller is connected to a control input of the control switch. The controller is adapted to adjust a voltage or current through the load output.

Abstract: A switching control circuit includes an A/D converter that converts detection signals of an input voltage detection circuit, a current detection resistor, and an output voltage detection circuit into a digital signal, a D/A converter that provides a reference voltage to an analog comparator, a PWM circuit that outputs a control voltage to a switching element, and a CPU that provides a specified value to the D/A converter as a reference value, reads the values converted by the A/D converter, and obtains the average value of the inductor current. The CPU reads an inductor current Ib when the output of the PWM circuit is set at a high level, and obtains the average value of an inductor current peak value Ip determined by the specified value and the inductor current value Ib at turn-on as an average inductor current value ILav.

Abstract: A power control system includes a rectifier circuit, a buck circuit, a voltage divider circuit, a control circuit, and a switch circuit. A first terminal of the rectifier circuit is connected to an alternating current (AC) power supply. A second terminal of the rectifier circuit is connected to a first terminal of the buck circuit and a first terminal of the voltage divider circuit. A first terminal of the control circuit is connected to a second terminal of the buck circuit. A second terminal of the control circuit is connected to a second terminal of the voltage divider circuit. A third terminal of the control circuit is connected to the switch circuit. The switch circuit is connected to the AC power supply and an electronic device.

Abstract: A switching mode power supply includes an EMI filter unit, a PFC unit, a DC/DC unit, a PFC controller including a feedback stage to which a link voltage at an output side of the PFC unit is fed back and an overvoltage protection stage, a DC/DC controller generating a burst mode operation signal in a light-load or no-load condition, an error signal generation unit for sensing an output voltage of the power supply to generate an error signal, and a control unit for enabling the PFC unit to operate in a burst mode by connecting the overvoltage protection stage and the feedback stage. When the error signal is smaller than a predetermined value, the DC/DC controller generates the burst mode operation signal. When the link voltage fed back to the feedback stage exceeds a threshold voltage of the overvoltage protection stage, the PFC controller deactivates the PFC unit.

Abstract: In a rectifier unit having a MOSFET, there is provided a stable MOSFET rectifying operation which is not influenced by a power generation condition from a start of an engine. An output VS obtained by adding phase voltages VU, VV, and VW and a power generation voltage VBR are compared by COM1. During a period of VBR>VS, a timing signal VT having a cycle of an electrical angle of 120 degrees is obtained. In synchronism with rising of logical products AND1 and AND2 based on a comparison result VH-ON of a phase voltage VU and a power generation voltage VB and a comparison result VL-ON of a phase voltage VU and a GND potential, flip-flops FF1 and FF2 are operated. Then, a gate signal VHGD of an upper-stream side MOSFET and a gate signal VLGD of a lower-stream side MOSFET are outputted to execute a MOSFET rectifying operation.

Abstract: A power supply input device including a first resistance of a discharge resistance conversion unit connected in parallel to a discharge resistance unit; and a switching unit of the discharge resistance conversion unit connected to the first resistance and performing a switching operation according to an externally received control signal, thus minimizing power losses occurring when a system is in a standby mode.

Abstract: Methods, devices, and systems implementing AC mains circuit parameter characterization are provided. One example embodiment of an image forming device includes a variable electrical load, and a controller adapted to vary the electrical load based on a characterization of AC mains circuit parameters including source voltage and line impedance wherein line impedance is determined for a change in source voltage.

Abstract: An n-phase transistor active bridge circuit (BC) connectable between at least two input lines (103, 105, 1051, 1053, 1055) and a pair of output lines (134, 136, 1057, 1059). The BC comprises a plurality of field-effect transistors (FETs) of the same channel type. The FETs (102, 104, 106, 108, 1010, 1012, 1014, 1016, 1018, 1020) are connected to convert an n-phase AC waveform (402, 1102, 1104, 1006) to a DC waveform (502, 1302). The n-phase AC waveform is applied to BC by a voltage source (101, 1002, 1004, 1006) coupled to the input lines. Gate drive circuits (170, 172, 174, 176, 1001a, 1001b, 1001c, 1003a, 1003b, 1003c) supply a voltage to gates (139, 143, 147, 151, 1024, 1034, 1044, 1054, 1064, 1074) of the FETs for switching the FETs to their “on” states or “off” states at predetermined times.

Abstract: Power conversion systems and diagnostic techniques are presented for detecting suspected converter faults when a pre-charge circuit is engaged during system startup, in which known or estimated system characteristics are used to derive expected converter voltage values or rate of change values and the levels are measured during startup to ascertain whether the pre-charge circuit or other converter components are faulted.

Abstract: A circuit arrangement for wirelessly exchanging data with a reader device, including an antenna for converting electromagnetic radiation into an antenna voltage, an analogue circuit for demodulating an information signal based on the antenna voltage, and a digital circuit for processing of the information signal and for receiving power from the analogue circuit. The circuit arrangement also includes a decoupling circuit, which is interconnected between the analogue circuit and the digital circuit and provides a decoupling of both circuits.

Abstract: The following invention is an electromechanical system (1) that is to be connected to an electricity supply (7), comprising: an electric machine (2) that can operate as an independent generator with a rotating shaft, and a switching system (9) allowing i) in the first configuration, the electric machine to operate as a motor in the case where the connected device (4) is normally driven or as a generator in the case where the coupled device is normally driving, and ii) in the second configuration, the electric machine to operate as an independent generator, the electrical energy generated by the electric machine (2; 22) being dissipated in the machine and in a dissipative load (13).

Abstract: A method and circuit is provided for reducing power consumption in a power transformer, typically incorporated into an electrical or electronic device such as a consumer device. In an embodiment, a detection/isolation circuit is coupled to an input of a power transformer/rectifier via a switching device. The switching device can be, for example, a solid state relay. The detection/isolation circuit is configured to sense the occurrence of no-load conditions in the power transformer and responsively disengage the power transformer from a coupled source of power (e.g., wall outlet) via the coupled switching device.

Abstract: First and second rectification circuits are connected to a commercial AC power supply by a reactor. A load is connected between the output terminal on the positive side of the first rectification circuit and the output terminal on the negative side of the second rectification circuit. While the voltage or the commercial AC power supply remains at the positive level, a current flows through a path constituted by one of the diodes of the first rectification circuit and one of the diodes of the second rectification circuit. While the voltage of the commercial AC power supply remains at the negative level, too, a current flows through the path constituted by one of the diodes of the first rectification circuit and one of the diodes of the second rectification circuit.

Abstract: A rectifier circuit includes an input terminal that receives an alternating-current signal, a first rectifier circuit that generates a first direct-current voltage from the alternating-current signal, a bias-voltage generating circuit that generates a bias voltage from the first direct-current voltage, and a second rectifier circuit that generates a second direct-current voltage from the alternating-current signal biased with the bias voltage.

Abstract: In a power converting apparatus in which two three-phase converters (1), (2) are operated parallel to one another, the three-phase converters (1), (2) are controlled by using d- and q-axis voltage commands. DC current sensors (26), (27) detect individual output DC currents (26a), (27a) of the three-phase converters (1), (2), and a d-axis voltage command vdr for each of the three-phase converters (1), (2) is corrected in a manner that reduces a difference between the output DC currents (26a), (27a). In this way, an output imbalance between the two three-phase converters (1), (2) is corrected while decreasing limitations on arrangement of the DC current sensors (26), (27).

Abstract: A current control type converter has a converter section and a control section that includes three controllers. A first controller calculates and outputs an active current instruction value by proportional-plus-integral control to perform proportional integration of a deviation between the value of a DC voltage outputted from the converter section and a DC voltage instruction value. A second controller calculates and outputs an active voltage correction value by proportional-plus-integral control to perform proportional integration of a deviation between the active current instruction value from the first controller and the value of an active current inputted to the converter section. A third controller calculates and outputs a reactive voltage correction value by proportional-plus-integral control to perform proportional integration of a deviation between the value of a reactive current inputted to the converter section and a reactive current instruction value.