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

A multi-phase network power supply with compensation for harmonic oscillations relates to electrical engineering and is intended for supplying various electrical devices connected to a multi-phase alternating-current electrical network. The technical result of the claimed solution consists in lessening harmonic components, reducing pulsations in the voltage and current output by the power supply, and significantly reducing the required power. The multi-phase alternating-current network power supply with compensation for harmonic oscillations comprises a main multi-phase rectifier of the alternating-current network, an additional multi-phase rectifier, a controller and an additional voltage or current supply, wherein the positive terminal of the main multi-phase rectifier is capable of being connected to a load, and the negative terminal of the main multi-phase rectifier is connected to the positive terminal of the additional voltage or current supply, the negative terminal of which is capable of being connected to a load, the output terminals of the additional multi-phase rectifier are connected to the input terminals of the additional voltage or current supply, wherein the additional multi-phase rectifier is equipped with electronic switches, one in the circuit of each rectifying element, and each electronic switch is connected to the controller.

A secondary-side controller for an AC-DC converter that has a single synchronous rectifier sensing (SR_SNS) terminal, coupled to a synchronous rectifier (SR) of the AC-DC converter, and a voltage divider circuit coupled to the single SR_SNS terminal configured to provide signals to a sensing circuit. The voltage divider includes an active diode, an internal resistive element, and a switch, in which the active diode is configured to control the switch to enable or disable the internal resistive element based on a comparison result of a voltage at the single SR_SNS terminal and a reference voltage.

An active harmonic filter (AHF) and regenerating energy control (REC) apparatus for an adjustable speed drive (ASD) includes an inverter and a controller operatively coupled to the inverter to selectively control operation thereof. The controller is programmed to operate the inverter in different modes in order to manage different conditions that occur during operation of the ASD. In an AHF mode, the controller operates the inverter to filter harmonics present at an input to an ASD. In an REC mode, the controller operates the inverter to control regenerating energy flowing into the inverter from the ASD.

A plurality of gate drive circuits each drive a gate of a corresponding one of a plurality of switching elements included in a converter and an inverter. Each gate drive circuit includes a gate driver and a power source circuit. The gate driver drives the gate potential of the switching element to a potential corresponding to H or L level, in accordance with the gate signal input from a controller to the gate electrode of the switching element. The power source circuit supplies power to the gate driver. When a first switch is ON and a second switch is OFF, the controller, upon detection of an abnormality of the power source circuit of the gate drive circuit, turns on the second switch and turns off the first switch. The gate drive circuit maintains the gate potential of the switching element during the period from when the abnormality of the power source circuit is detected to when the second switch is turned on.

A DC-to-AC power converter having a main DC input and a main single-phase AC output, configured to convert and adapt a DC voltage at the main DC input into a sinusoidal AC voltage of a fundamental frequency at the main AC output and to deliver a rated power at the main AC output to a load includes: a single DC-to-DC converter having as input the main DC input and having a DC output and a tank capacitor being connected to the DC output, two low frequency diodes biased so as to be able to pass current from, respectively to, the DC output to, respectively from, the tank capacitor; and, according to a direct path, a bidirectional voltage-type DC-to-AC converter in cascade with the DC-to-DC converter, the bidirectional voltage-type DC-to-AC converter having a DC input-output connected to the DC output and an AC output-input connected to the main AC output.

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.

Disclosed in the present invention are a control method and device for a power factor correction circuit. The method comprises: obtaining voltage information of the power factor correction circuit; determining whether the voltage information meets a set switching condition; if the set switching condition is met, switching a control mode of the power factor correction circuit to a continuous conduction mode; and if the set switching condition is not met, switching the control mode of the power factor correction circuit to a triangular wave current mode or a critical conduction mode. Compared with the prior art, the control mode of the power factor correction circuit can be different according to the voltage information in the embodiment of the present invention, instead of remaining unchanged at all times, without increasing the withstand voltage level of the bus capacitor, thereby reducing the cost of implementation. Moreover, it is not necessary to forcibly change a given value of the current peak, thereby improving the total harmonic distortion of the input current.

A power conversion device includes first and second current detectors. A coil is connected a first power terminal through the first and second current detectors. A first switch has a source terminal connected to the coil and a second semiconductor switch has a drain terminal connected to the coil. A first diode is connected between a drain terminal of the first semiconductor switch and a second power supply terminal. A second diode is connected between a source terminal of the second semiconductor switch and the second power terminal. A capacitor is connected in parallel with the first and second diodes. A control circuit is configured to turn the first and second semiconductor switches on or off based on current detections of the first and second current detectors.

A power supply includes a primary circuit connected to a primary winding of a transformer and a secondary circuit connected to a secondary winding of the transformer. The primary circuit includes MOSFETs, and the secondary circuit includes MOSFETs configured to rectify power transmitted from a primary side of the transformer and includes a capacitor configured to store the rectified power. The secondary circuit performs a discharge operation of discharging the capacitor and causing a current to flow into the secondary winding of the transformer to reduce a source-drain voltage of the MOSFETs before the MOSFETs are switched from an off state to an on state. Thus, the power supply having a high power-conversion efficiency even during low output is provided.