A capacitor-drop power supply includes a rectifier and a rectifier controller. The rectifier is configured to receive an alternating current (AC) signal at an AC voltage and convert the AC signal into a rectified direct current (DC) signal at a rectified voltage. The rectifier includes a first low side switch. The rectifier controller is configured to generate a switch close signal based on the rectified DC signal. The switch close signal is configured to close the first low side switch shunting the AC signal to ground.

The disclosure relates to an AC-DC conversion device for converting an alternating current (AC) voltage into a direct current (DC) voltage, the AC-DC conversion device including an AC input terminal for receiving an AC voltage and an AC-DC conversion stage being configured top convert the AC voltage into a first DC voltage, convert the AC voltage into a second DC voltage, and output the second DC voltage at an output of the AC-DC conversion device. The AC-DC conversion device further includes a partial power DC-DC converter configured to regulate the second DC voltage based on a required voltage across the output of the AC-DC conversion device. The disclosure further relates to a voltage converter circuit comprising such an AC-DC conversion device and an output for providing an isolated output voltage.

This power receiving-type information acquisition and transmission device 101 is provided with one or more power receiving means 110 which receive power supply waves that can supply power, one or more power storage means 120 which store power obtained by the power receiving means, one or more information acquisition means 130 which acquire information by expending at least part of the aforementioned power of the power receiving means 110 and/or the power storage means 120, and one or more information transmission means 140 which utilize the power from the power storage means 120 to transmit information externally. This enables regular or steady information collection, and enables transmitting said information stably, on a permanent basis and remotely, i.e., either over a short or long distance externally.

There is described a power supply unit having at least one alternating current (AC) input and at least one direct current (DC) output for producing an output voltage. The power supply unit comprises at least one input transformer coupled to the at least one AC input and at least one rectification circuit defining an AC side and a DC side, and coupled to the at least one input transformer on the AC side. The at least one rectification circuit comprises a diode rectifier section on the AC side comprising at least one set of diode rectifiers, and a controlled rectifier section in series with the diode rectifier section and configured for producing a variable load voltage to modulate the output voltage between a base voltage and a maximum value of the output voltage using at least one set of three single-phase controlled rectifiers usable as one to three DC outputs to form a three-phase controlled rectifier.

A hybrid rectifier is provided including a top diode for conducting current during a positive current portion of a line current, a top transistor connected in parallel to the top diode, a bottom diode for conducting current during a negative current portion of the line current, and a bottom transistor connected in parallel to the bottom diode. A hybrid-rectifier controller is connected to the top transistor and the bottom transistor for implementing a transistor control strategy such that, during the positive current portion of the line current, the top diode conducts current and the bottom transistor conducts current only when the line current is below a sinusoidal reference current. Similarly, during the negative current portion of the line current, the bottom diode conducts current and the top transistor conducts current only when the line current is above the sinusoidal reference current.

An apparatus and method for use in electrical conversion are described. The apparatus includes a bridge rectifier having an input side and an output side, and a switched capacitor line connected across the output side of the rectifier, wherein the switched capacitor line includes a capacitor, a charging leg and a switched discharge leg, and wherein the charging leg incorporates a transistor controlled so as to maintain a substantially constant charging current when the transistor is conductive.

A control device outputs, to a to-be-controlled system which operates based on a control input and from which an observable amount varying cyclically is obtained, the control input based on the observable amount. The control device includes a deviation processing unit performing at least proportional integral control on a deviation between the observable amount and a command value being a target value of the observable amount and varying cyclically, and a totaling unit totaling an output of the deviation processing unit for each cycle of the command value to generate the control input.

An electrical system including a three phase AC input supply and three or more H-bridge converter cells. Each H-bridge converter cell has: an active front end rectifier for receiving the three phase AC input supply and transforming it into a DC supply, thereby providing a rectifier current i.sub.i; a capacitor suitable to receive a capacitor current i.sub.C, the capacitor smoothing the DC supply; and an inverter suitable to receive an inverter current i.sub.o, wherein i.sub.o=i.sub.ii.sub.C, said inverter transforming the received inverter current i.sub.o into a single phase AC supply. The system also including a control subsystem, which provides a signal to each active front end rectifier to vary its respective rectifier current i.sub.i such that the difference between the rectifier current i.sub.i, provided by the active front end rectifier, and the inverter current i.sub.o, received by the inverter, is substantially zero.

An AC/DC converter including: an H bridge; an inductance in series with an input of the bridge; an inductance in series with an output of the bridge; and a circuit capable of controlling the bridge alternately to a first configuration where first and second diagonals of the bridge are respectively conductive and non-conductive, and to a second complementary configuration, the circuit being capable, during a phase of transition between the first and second configurations, of: turning on a first switch of the second diagonal; turning off a first switch of the first diagonal when the current flowing through this switch takes a zero value; turning on the second switch of the second diagonal; and turning off the second switch of the first diagonal when the current flowing through this switch takes a zero value.

The present invention discloses a hybrid transformation system based on three-phase voltage type PWM rectifier and multi-unit uncontrolled rectifier. The hybrid transformation system mainly consists of a three-phase reactor (L), a three-phase voltage type PWM rectifier module, an N-unit three-phase uncontrolled rectifier bridge module group, capacitors (C0-CN) and a DSP control circuit. An input end of the three-phase voltage type PWM rectifier module is in parallel connection with an input end of each three-phase uncontrolled rectifier bridge module. The three-phase voltage type PWM rectifier module may work in to situations, with load or without load, and the three-phase voltage type PWM rectifier module just does reactive power compensation when working without load. All modules of the three-phase uncontrolled rectifier bridge module group may work in to situations, with loads independently or all the outputs are in parallel connection and with a same load. The hybrid rectifier system has advantages such as unity input power factor, grid side current low harmonic, high power output, low cost, easy control, and etc.