3 results about "Full wave" patented technology

The invention discloses a rectifier circuit for piezoelectric energy collectors to solve the problem that the energy consumption of an existing circuit is high and the efficiency of a piezoelectric energy collector is low when the rectifier voltage of the piezoelectric energy collector is greater than 2.5 V. The rectifier circuit comprises a full-wave rectifier bridge (2) and an active diode circuit (4), and further comprises a bias circuit (3). The output end of the full-wave rectifier bridge (2) is connected with the input ends of the active diode circuit (4) and the bias circuit (3). The output end of the bias circuit (3) is connected with the bias voltage end of a comparator in the active diode circuit (4). The output end of the active diode circuit (4) is connected with an energy storage capacitor C3. The rectifier circuit for piezoelectric energy collectors has the advantages of being low in power consumption, high in energy conversion efficiency, and capable of ensuring the energy demand of wireless sensor network node load.

The invention provides a frequency converter soft start system and method and a frequency conversion air-conditioner applied therewith. The frequency converter soft start system comprises a three-phase bridge-type full-wave rectifier circuit, of which the upper bridge arm is a three-phase bridge-type half-wave controllable circuit; a zero point detection circuit which is connected with the voltage input end of the three-phase bridge-type full-wave rectifier circuit and is used for outputting a zero point signal of the input voltage of the three-phase bridge-type full-wave rectifier circuit; a sampling circuit which is connected with the output end of the three-phase bridge-type full-wave rectifier circuit and is used for detecting the output voltage of the three-phase bridge-type full-wave rectifier circuit and outputting sampling signals; an operation circuit which is connected with the zero point detection circuit and the sampling circuit and is used for outputting phase shift signals through a shift signal output end according to the sampling signals and the zero point signal; and a drive circuit which is connected with the shift signal output end and is provided with a drive signal output end used for outputting drive signals obtained according to the shift signals, wherein the drive signal output end is connected with the control end of the upper bridge arm of the three-phase bridge-type full-wave rectifier circuit. According to the frequency converter soft start system and method and the frequency conversion air-conditioner applied therewith, the impact on the load of a frequency converter can be prevented.