34results about How to "Improved Linear Regulation" patented technology

A doctor blade system utilizes a lightweight doctor blade chamber to apply ink to an inking roller. The doctor blade chamber is removably positioned on a support plate which is, in turn, carried by linear guides on pivotable end plates. A rigid box beam is also attached to the end plates and is spaced from the support plate. A plurality of membrane cylinders are mounted on the rigid box beam and engage a surface of the support plate opposite to the surface that supports the doctor blade chamber. Through the application of suitable force, the support plate and its supported doctor blade chamber can be moved, by sliding motion on the linear slides, into uniform engagement with the surface of the ink roller. The system uses pivotable end plates which are supported by exterior plates that are, in turn, pivotably supported by press side frames. The chamber doctor blade and its support plate and box beam can be moved into several different positions, with respect to the cooperating ink roller, to facilitate doctor blade chamber cleaning or replacement or ink roller replacement.

The invention provides an LED driving circuit applicable to a silicon controlled rectifier light modulator, and a control circuit thereof. The control circuit comprises a light modulation phase detection circuit, a phase filtering circuit connected with the light modulation phase detection circuit, a non-linear reference circuit connected with the phase filtering circuit, a zero cross detection circuit in direct or indirect coupling with an output end of the LED driving circuit, an output current simulation circuit connected with the zero cross detection circuit, an average current ring adjusting circuit connected with the non-linear reference circuit and the output current simulation circuit, a reset circuit connected with the average current ring adjusting circuit, an interrupted time-delay circuit connected with the phase filtering circuit, and a main driving circuit connected with the reset circuit, the interrupted time-delay circuit and the zero cross detection circuit. The control circuit can realize high power factor single-stage light modulation and has advantages of no scintillation and good compatibility.

The invention discloses a band gap reference voltage source circuit, which comprises a regulating resistor and a feedback loop consisting of MOS (Metal Oxide Semiconductor) tubes, and is characterized in that: the regulating resistor comprises a first group of regulating resistors which is connected in series to the feedback end of the feedback loop and a second group of regulating resistors which is connected in series to the output end of the feedback loop; the first group of regulating resistors comprises a resistor R2 and a resistor R3 which are connected in series; the second group of regulating resistors comprises a resistor R2' and a resistor R3' which are connected in series; the resistance value of the first group of regulating resistors is equal to that of the second group of regulating resistors; the resistance value of the resistor R2 is equal to that of the resistor R2'; the resistance value of the resistor R3 is equal to that of the resistor R3'; and the resistance values of the R2, R2', R3 and R3' are adjustable. The linear regulating rate of the circuit is remarkably higher than that of the conventional operational amplifier-free band gap reference voltage source circuit, so that the stability of the circuit is higher.

The invention relates to the field of mobile phone chargers, and especially relates to a loop compensation circuit, a switching power supply circuit and a switching power supply charger. The loop compensation circuit comprises a main power circuit and a feedback control circuit with voltage outer loop feedback and current inner loop feedback, wherein the main power circuit performs voltage reduction and voltage ripple filtering on inputted direct current; and the feedback control circuit performs adjustment on output voltage of the main power circuit and then feeds back the regulated voltage to an input end of the main power circuit. The loop compensation circuit provided by the invention adopts the feedback control circuit with voltage outer loop feedback and the current inner loop feedback to perform feedback control on the output voltage, thereby improving the output stability, the transient response ability and the load linear regulation rate of the loop compensation circuit, and thus improving the charging efficiency of a switching power supply charger.

A primary side feedback switching power supply control chip includes a reference voltage unit, a comparator unit, a voltage monitoring unit, a driving unit, a switch unit and a rectifying unit, the switch power supply control chip omits a self-powered time generator, the self-supply time within a single cycle is determined by the voltage at the voltage feedback pin of the switching power supply control chip. In addition, an energy storage module for supplying power to the switching power supply control chip is connected between a power supply pin and a voltage feedback pin of the switching power supply control chip, so that whether the control system operates in the self-powered mode or the non-self-powered mode, The current is passed through the voltage sampling module, so that the peak current expression of the energy storage transformer module is the same, so that the performance of the control system is not affected in the self-powered mode, the minimum load capacity is strong in the constant voltage mode, the constant current precision is high and the linear adjustment rate is good in the constant current mode.

The invention discloses a steel truss girder assembling scaffold used in construction of steel-concrete composite truss girders, and belongs to the technical field of bridge construction. The steel truss girder assembling scaffold comprises multiple assembling scaffold units corresponding to longitudinal joints of steel truss girders, each assembling scaffold unit comprises an upper support and a lower support correspondingly arranged on the lower portion of the upper support, each lower support is located on the lower portion of a girder body and comprises four vertically and rectangularly arranged steel columns, the lower end of each steel column is connected with a concrete foundation arranged on the lower portion thereof, each upper support comprises two supports transversely arranged along the steel truss girders and an upper cross girder connected to the upper end of the two side supports, the upper end of each of the four steel columns of each lower support is fixedly connected with a solid girder crossing steel column, and each girder crossing steel column penetrates the corresponding girder body to be fixedly the lower end of each upper support. Strong support points are provided for steel girder assembling, and excessive stress concentration of the girder body concrete poured scaffold at the positions of the steel truss girder joints is avoided..

A power circuit comprises a current source, a switch, first and second comparators, a latch, a drive, second and third resistors, a first capacitor, first and second electric switches, and a proportional converter. The current source is grounded through the first capacitor. The cathode and the anode of the current source are connected to a voltage input end through the proportional converter to make a second current change according to the change of a voltage input by the voltage input end. The first comparator compares a fixed voltage with the voltage on the first capacitor. A second capacitor is grounded through the switch which is controlled by a reverse PWM signal. The first comparator is connected with the drive through the latch, and makes the drive output a PWM low level signal. The second and third resistors are connected in series between a voltage output end and the ground. The second comparator compares the voltage at a node between the second and third resistors with a reference voltage. The second comparator is connected with the drive through the latch, and makes the drive output a PWM high level signal. The system stability is improved.

The invention provides a plunger type oil spraying pump achieving variable oil supply under multiple working conditions. The plunger type oil spraying pump mainly comprises a plunger and barrel assembly, an oil adjusting device composed of a rack, a gear and a rotating shaft, a driving selecting device composed of a driving frame, a top plate and a top plate stirring rod, an auxiliary driving device composed of a guide plate, a wheel frame and a wheel, and a double-speed-cam driving device composed of a driving shaft, a low-speed cam and a high-speed cam. The plunger type oil spraying pump achieving variable oil supply under the multiple working conditions is characterized in that variable oil supply under the multiple working conditions is achieved through three kinds of chutes, the high-speed cam and the low-speed cam. Multi-working condition adjustment on the effective stroke of a plunger is achieved through the three kinds of chutes in the side face of the plunger, in other words, fine adjustment and buffered oil spraying are achieved through the double-curve type chute, convenient linear adjustment and accurate control are achieved through the linear chute, and rapid emergency adjustment is achieved through the fast-opened chute. Positioning of the three kinds of chutes is achieved through a magnetic block at the position of a notch of the gear and a magnetic strip on a plunger sleeve. The oil pumping frequency is adjusted through the high-speed cam and the low-speed cam on the driving shaft, and variable oil supplying under the multiple working conditions is achieved.

The invention provides a wall-mounted type sleeve drain valve. The wall-mounted type sleeve drain valve comprises a valve body, an indicator rod, a flow guide device, a sleeve brake, a sleeve, a mainseal ring, an access cover, a sliding seal ring, a displacement sensing device, a hydraulic cylinder and a tumbler. The hydraulic cylinder drives the sleeve brake to move, and the indicator rod move front and back with the sleeve brake and drives the tumbler to swing. The tumbler drives an output shaft of the displacement sensing device to rotate, and the linear displacement converting into a rotation signal is realized. Compared with prior art, the wall-mounted type sleeve drain valve realizes free drain in air or under water, has no erosion to vegetation, mountains and river beds at an outlet, and saves land and construction cost.

The invention discloses a bridge shoal large-tonnage beam section hoisting construction support system which sequentially comprises a high storage beam support, a lifting support and a lower slide way in the direction gradually away from the shoreside, the lower slide way is located on a bridge shoal, and the lower slide way is located below the lifting support so as to transport a to-be-constructed beam section. The lower slide way and the lifting support are partially overlapped in the vertical direction so that a to-be-constructed beam section on the lower slide way can be lifted to the lifting support, the top end of the lifting support and the top end of the high beam storage support are flush, and track beams are laid on the lifting support and the top end of the high beam storage support. Seamless joint of procedures such as underwater transportation, slippage and hoisting construction of the side-span shoal and the end beam section is achieved, and the construction risk is reduced.

The invention relates to a high-efficiency cooling roughed powder drawing stainless steel wire drawing die. The die comprises a die box (2), wherein the die box (2) is of a hollow box-shaped structure; a die holder (3) penetrates through the left and right box walls of the die box (2); a die sleeve (4) is embedded into the die holder (3); a drawing die (6) is arranged in the die sleeve (4); and a water inlet and a water outlet are formed in the bottom of the die box (2). The high-efficiency cooling roughed powder drawing stainless steel wiredrawing die disclosed by the invention has the characteristics of good cooling effect and excellent drawing effect.