57results about How to "Realize multi-level adjustment" patented technology

The invention is applicable to the technical field of an LED and provides an LED driving circuit and an LED lamp. In the invention, the LED driving circuit is provided with an input current detection unit, a feedback unit, a control unit and a switch unit, wherein the feedback unit leads the LED driving circuit to be a closed loop circuit, the control unit controls the switch unit and the LED driving circuit to output current according to signals sent by the input current detection unit and the feedback unit, thus improving the effect of the LED driving circuit in adjusting the brightness of LED, further realizing the multi-stage adjustment of the brightness of the LED and boosting the accuracy and stability when the LED driving circuit outputs current.

The invention discloses a multi-stage dimmable digital pulse oximetry and a using method thereof, and relates to the technical field of medical equipment. The oximetry comprises a singlechip, a current-limiting resistance regulating circuit, a photosensitive tube and a light emitting tube, wherein the current-limiting resistance regulating circuit is connected with the singlechip and the light emitting tube, and is used for regulating the light intensity of the light emitting tube according to a control instruction of the singlechip; the light emitting tube is used for alternatively emitting two beams according to the light intensity; the photosensitive tube is connected with the singlechip, and is used for receiving transmission light after the two beams pass through a living body, converting the transmission light into a digital signal, and transmitting the digital signal to the singlechip; and the singlechip is used for receiving the digital signal, and transmitting the control instruction to the current-limiting resistance regulating circuit according to the digital signal, or calculating to obtain blood oxygen data. According to the oximetry, the measurement range of the oximetry is fundamentally enlarged by multi-stage regulation to the light intensity of the light emitting tube.

The invention relates to a power module and an output voltage regulating method thereof. The power module is provided with a voltage output end and comprises a power supply IC and an output voltage feedback network. The voltage output end is electrically connected with the output end of the power supply IC. The output voltage feedback network comprises a first divider resistor and a second divider resistor, wherein the first divider resistor and the second divider resistor are connected between the voltage output end and a reference potential in series, and a node between the first divider resistor and the second divider resistor is electrically connected with the feedback end of the power supply IC. In addition, the output voltage feedback network further comprises a divider resistance value regulating unit electrically connected between the node and the reference potential. The divider resistance value regulating unit comprises a three-end switch element and a third divider resistor. The three-end switch element comprises a first end, a second end and a control end. The first end is electrically connected with the reference potential, and the second end is electrically connected with the node through the third divider resistor. Thus, the multi-stage output voltage regulation of the power module can be achieved, and the power module has the advantages of being low in implementation cost, stable in implementation and the like.

The invention discloses a novel supporting device for a gas drilling sand draining pipe. The novel supporting device comprises an upper pressing sleeve (6), a lower supporting sleeve (7), a supporting base (8) and a height adjusting sleeve (11). A plurality of through holes I (13) penetrating through the supporting base (8) are formed in the cylindrical surface of the supporting base (8) in the length direction of the supporting base (8). A plurality of through holes II (15) penetrating through the height adjusting sleeve (11) are formed in the cylindrical surface of the height adjusting sleeve (11) in the length direction of the height adjusting sleeve (11). The height adjusting sleeve (11) is fixed into a cavity (12) through a height fixing pin (10) which penetrates through any through hole I (13) and the corresponding through hole II (15). The upper pressing sleeve (6) is fixed to the lower supporting sleeve (7) through connecting bolts (19). The bottom of the lower supporting sleeve (7) is further provided with a single-hole hinge support (17). The novel supporting device has the advantages that the mounting difficulty is lowered, the construction time is shortened, the suspension stability is improved, and safety and reliability are achieved.

The invention provides a hydraulic drilling and pressing device, which comprises an upper joint connected with a drill rod; an outer cylinder, one end of the outer cylinder is connected with an upperjoint, a support, an elastic piece and a cylinder body are arranged in the outer cylinder, the elastic piece is arranged between the support and the cylinder body, when the support compresses the elastic piece under different pressures, the lower end of the support seat enters different parts of the stepped hole of the cylinder body so as to transmit different drilling pressures; and a lower jointassembly connected with the drill bit and provided with a torque transmission mechanism, which on the one hand provides connection with the outer cylinder and transmits torque through the torque transmission mechanism, and on the other hand transmits drilling pressure coming from the cylinder body to the drill bit through an internally arranged flow passage. The hydraulic drilling and pressing device can improve the transmitted drilling pressure value, realize the multi-stage adjustment of the one-stroke drilling pressure, improve the drilling pressure transmission efficiency, reduce the axial vibration of the drill bit and solve the drag pressure problem in the horizontal well.

The invention discloses a current quick shifting method and direct current power supply. The characteristics of high speed, small loss, pressure resistance and strong through-current capability of an IGBT (insulated gate bipolar transistor) switch are used; the IGBT is used as a quick switch to control the on-off of a power supply; then a current quick shifting branch is formed by a plurality of IGBTs and a plurality of resistors, and is connected with a backward-level load; the on-off of all the IGBTs is independently controlled by a uniformed control system; the on-off of the IGBTs can be controlled so as to control the quick shifting of currents and adjust the switching depth and switching width of the currents. Checked by practice, the invention has the characteristics such as quick current switching response speed, high switching precision, small current ripples, and the like, and is suitable to be popularized and used in a plurality of occasions requiring current switching.

The invention belongs to the field of printing, and particularly relates to an environment-friendly dust collection mechanism of printing equipment. The environment-friendly dust collection mechanismcomprises a box body, and a first air exchange chamber and two second air exchange chambers are arranged in the box body; pistons are slidably connected with the interiors of the first air exchange chamber and the second air exchange chambers, and toothed bars are fixedly connected with the pistons, and one ends of the toothed bars penetrate through the box body; the first air exchange chamber andthe second air exchange chamber are each provided with a driving mechanism cooperatively, and a linkage mechanism is arranged between the driving mechanisms; and the first air exchange chamber and the second air exchange chamber each communicate with a ventilation pipe. According to the environment-friendly dust collection mechanism, through cooperation of the driving mechanisms and the toothed bars, the pistons can be driven to do reciprocating motion, and through reverse driving of the driving mechanism of the first air exchange chamber, paper can be sucked and blown through the first air exchange chamber and the second air exchange chamber in a reciprocating mode alternately, so that dust flying on the paper by vibration can be timely collected through a dust hood, and the dust collection efficiency is improved; and the situation that the dust flies around to influence the environment is avoided.

The invention relates to the technical field of electric power, and discloses a new material power cable tension control device utilizing a pulley block principle. The new material power cable tensioncontrol device comprises a shell, a fixed pulley is arranged in the shell, a rotating wheel is arranged in the shell, a first movable pulley is arranged on the surface of the rotating wheel, and a push column is arranged on the surface of the rotating wheel; and a second movable pulley is arranged in the shell, a push plate is arranged on the surface of the second movable pulley, a driving pulleyis arranged in the shell, and a sliding seat is arranged on the surface of the driving pulley. According to the new material power cable tension control device utilizing the pulley block principle, the fixed pulley and the first movable pulley are used in cooperation, the first movable pulley and the second movable pulley are used in cooperation, and the second movable pulley and a driving pulleyare used in cooperation, so that multi-stage adjustment of the length of a cable is achieved, meanwhile, resistance during adjustment is reduced, the effect of adjusting the length of the cable is effectively improved, the use safety of the cable is guaranteed, and the service life of the cable is prolonged.

The invention relates to an inerter capable of adaptively adjusting an inerter coefficient. The inerter comprises a screw rod, a supporting block, an inner cylinder and one or more outer cylinders, the supporting block is sleeved with the inner cylinder, balls are filled between the inner cylinder and the supporting block, the inner cylinder is sleeved with the outer cylinder, and the side face in at least one direction is supported on the supporting block through the balls; the screw penetrates through the inner cylinder and the supporting seat and is meshed with the inner cylinder, and a friction plate is arranged between the inner cylinder and the outer cylinder. Compared with the prior art, the inner cylinder and the outer cylinder are supported by the friction plates, so that self-adaptive adjustment of the inerter coefficient is realized by utilizing static friction and sliding friction mechanisms.