Abstract: The present invention relates to a corkscrew, comprising a positioning cylinder, and the needle inflator; positioned symmetrically on both sides of the cartridge a notch opening, the upper end of the notch portion extends to the end to end of the positioning cylinder, the lower end extends close to the lower end to end positioning cylinder the position of the portion, at both sides of the positioning cylinder notches symmetrically arranged circular arc shape in cross section the elastic pressing disc, the lower end of the elastic pressing piece are connected to the lower end of the positioning tube and integrally formed on its upper end extends to near the end to end positioning cylinder portion of the position, horizontal and inwardly at both ends thereof, respectively, the upper end of the cutting blade is mounted; the central cylinder is provided with an upper end of the positioning pin holes; puncture needle hollow interior, with its upper air inlet, the lower end of the tip-side portion thereof is provid

Abstract: The present invention discloses a DC-to-DC step-up converter to which a logic control unit is added in order to reduce the ripples of a DC output voltage and improve the power quality. The converter of the present invention comprises a step-up circuit, a ring oscillator, a divider circuit, a PFM (pulse frequency modulation) comparator and a logic control unit. The step-up circuit is used to step up a source voltage to generate a DC output voltage. The ring oscillator is used to generate an oscillator output signal. The divider circuit receives the DC output voltage to generate a feedback voltage. The PFM comparator compares the feedback voltage with a reference voltage to generate a comparator output signal to control outputting of the oscillator output signal.