5results about How to "Reduced insulation requirements" patented technology

This invention discloses an inertia-adjustable grid-connected device and control method for reducing motor-to-ground voltage. The device comprises an even number of motor grid-connected interface devices connected in series between the positive and negative buses of a bipolar DC-DC converter. The intermediate node of each even number of motor grid-connected interface devices is grounded to reduce the motor-to-ground voltage. Each motor grid-connected interface device includes a doubly-fed induction generator (DFIG), a first DC / AC converter, a permanent magnet synchronous motor (PMSM), and a second DC / AC converter. The positive terminal of each motor grid-connected interface device is connected to the positive DC side of both the first and second DC / AC converters, and the negative terminal is connected to the negative DC side of both the first and second DC / AC converters. This invention aims to reduce the ground voltage of both the DFIG and PMSM, lower insulation requirements, extend insulation life, and improve the stability and reliability of the electrical system.

The utility model belongs to gas -cooker technical field discloses a kind of commercial gas -cooker of external low-voltage power supply, this gas -cooker is converted into 24V direct current safety very low voltage by using the power adapter of external convertible voltage, realizes the safe work of gas -cooker;The gas -cooker includes cooktop main body, gas system (including gas valve, igniter etc.), safety control system and the 24V low-voltage wiring harness of connecting each component.The utility model removes the 220V high-voltage line and connecting point of traditional gas -cooker through cookware interior completely, fundamentally eliminates electric shock accident and high-voltage short-circuit fire risk caused by internal line aging, breakage, maintenance error touch.

This invention discloses a MOSFET-based isolated drive circuit system that is easy to control, comprising: an input voltage regulator circuit, a transformer drive circuit, a transformer secondary rectifier and filter circuit, a drive output, and a negative voltage bootstrap circuit; wherein, the input voltage regulator circuit includes: a linear voltage regulator element, a drive power supply, a feedback network, and a filter capacitor; the input terminal of the linear voltage regulator element is coupled to the drive power supply, the drive power supply input voltage is VIN, and the linear voltage regulator element is connected to ground through the coupled feedback network; the input voltage regulator circuit is used to provide a stable DC input to the transformer drive circuit. This invention separates the secondary winding of the transformer in the auxiliary power supply of traditional technology and places it in a discrete transformer, effectively reducing the insulation requirements of the auxiliary power supply transformer and making it easier to drive more MOSFETs. By driving with high-voltage MOSFETs, the problem of excessive auxiliary power supply windings is effectively solved.

The present disclosure relates to a converter for transferring power from a medium voltage side to a low voltage side, comprising: a medium voltage unit on the medium voltage side, comprising a DC / AC unit having a medium voltage AC terminal; a low-voltage unit located at the low-voltage side and configured to generate a low-voltage direct-current voltage from a low-voltage alternating-current voltage at the low-voltage alternating-current terminal; a first transformer unit configured to generate a low-voltage AC voltage at the low-voltage AC terminal from a medium-voltage AC voltage at the medium-voltage AC terminal; a second transformer unit configured to generate an auxiliary AC supply voltage at one or more supply terminals of the second transformer unit from a medium voltage AC voltage at a medium voltage AC terminal; and an auxiliary power supply circuit configured to provide an auxiliary power supply to one or more components of the medium voltage unit based at least in part on an auxiliary AC power supply voltage at the one or more power supply terminals. The invention further relates to a corresponding method for operating the converter.

The utility model discloses a weather resistant charging cable and charging pile, charging cable includes: by power line core, control line core, ground wire, auxiliary power cord and return flow pipe and is twisted into the cable core and the sheath of cladding in the cable core outside, the outside of power line core's central conductor is equipped with a cooling pipe, and the medium flow channel is formed between its inner wall and central conductor, and the medium flow channel and return flow pipe are all used for passing into cooling medium and the flow direction of cooling medium in the medium flow channel and return flow pipe is opposite, and the central conductor is twisted into by several conductor strands, and each conductor strand is twisted into by several monofilament conductors, and the monofilament conductor is composed of metal conductor and insulating coating coated on the outside surface of metal conductor. Return flow pipe and the power line core with the outside cooling pipe are all provided with 2. The utility model neither influences the heat dissipation performance of conductor itself, and can reduce the insulating property requirement of cooling medium in medium flow channel, improves the safety in the use process.