8 results about "High impedance" patented technology

The present invention discloses a USBC cable testing circuit, comprising a plurality of positive voltage modules for a USBC connector open test positive voltage, a plurality of negative voltage modules for testing a negative voltage and a plurality of short circuit test modules for testing a USBC connector short circuit test. 24 pins of a USBC cable form 22 pin pairs with two adjacent pins as a pair. Two pin pairs of front and back of the USBC form a pin pair group, the positive voltage module is used to test a pin pair that is connected to a low impedance, and the negative voltage module is used to test a pin pair that is connected to a high impedance. The test circuit has following advantages: time saving, wherein measurement of 24 pin positions of the USB-C is completed in a few seconds, and measurement for the prior art needs 10 minutes; trouble saving, wherein a test fixture can finish measuring the USB-C terminal while the prior art requires many devices such as a multimeter anda microscope. The testing circuit has high accuracy, has the small USBC connector, and a close distance between each pins. Only with the method, accurate testing can be achieved.

A three-phase fault current limiter FCL has three spaced apart input terminals for electrically connecting to respective terminals of a transformer. Three output terminals electrically connect FCL with a load circuit which draws load current I_LOAD. FCL includes two longitudinally spaced apart generally circular High Temperature Superconducting (HTS) DC coils which have central generally cylindrical cavities. FCL also includes a longitudinally extending magnetically saturable core which has six like coextensive parallel and elongate posts. Each post includes a first longitudinal portion and, a second longitudinal portion and a third longitudinal portion extending longitudinally oppositely away from the first portion. Each second portion and third portion is received within one of the central cavities. Three copper-based insulated AC coils are each wound about respective first portions for carrying load current I_LOAD between input terminals to respective output terminals. DC coils magnetically bias the core such that, in response to one or more characteristics of the load current I_LOAD, the AC coils move from a low impedance state to a high impedance state.

A transceiver separation circuit, a transceiver and a wireless communication device, the transceiver separation circuit comprises: a transmission amplifier circuit, an impedance adjustment circuit and a reception amplifier circuit, the output end of the transmission amplifier circuit is connected to the first end of the impedance adjustment circuit, and the impedance adjustment circuit The second end of the circuit is connected to the input end of the receiving amplifying circuit, the second end of the impedance adjusting circuit and the input end of the receiving and amplifying circuit are also used to connect the antenna; the transmitting and amplifying circuit is used to amplify the first signal to be transmitted through the antenna; The amplifying circuit is used for amplifying the second signal received through the antenna, and when the antenna transmits the amplified first signal, the first impedance is in a high impedance state, and the first impedance is the impedance seen from the input port of the receiving amplifying circuit; The impedance adjustment circuit is configured to adjust the second impedance to a high impedance state when the antenna receives the second signal, and the second impedance is an impedance viewed from the second end of the impedance adjustment circuit.

The invention discloses high-permeability high-impedance manganese zinc ferrite and a preparation method thereof, and belongs to the technical field of magnetic materials. The novel ferrite material with high magnetic conductivity and high impedance is obtained by optimizing the raw material composition proportion of the main material and the auxiliary material and adjusting the ball-milling sintering process. A nano Tiamp; by doping MoO3, the microstructure of the ferrite can be improved on the whole, a compact structure is formed in the sintering process, pores are reduced, the reaction area is enlarged, the reaction rate is increased, grain growth is promoted, and the magnetic conductivity and impedance are improved. The obtained ferrite material has a high impedance value within the high-frequency range of 1-100 MHz, the applicable working conditions of the manganese-zinc ferrite are effectively widened, the practicability is high, and the market prospect is wide.