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 discloses an infrared light emitting diode driving circuit for infrared approach sensors. By the aid of the infrared light emitting diode driving circuit, the problem of great influence of change of anode voltages of existing infrared light emitting diodes on output currents of existing infrared light emitting diode driving circuits mainly can be solved. The infrared light emitting diode driving circuit comprises a current generating circuit (1), a current mirror (2) and an output-level circuit (3). Reference voltages are applied to two ends of a resistor by the current generating circuit (1) to generate reference currents, and the currents are mirrored to the output-level circuit (3) by the current mirror (2). The infrared light emitting diode driving circuit has the advantages that the output-level circuit (3) forces drain-source voltages of two NMOS (n-channel metal oxide semiconductor) transistors of the output-level current mirror to be consistent with one another by the aid of a negative-feedback loop, the negative-feedback loop comprises an operational amplifier and an NMOS transistor, accordingly, the currents can be accurately mirrored, and the driving circuit is excellent in linear regulation and high in swing and can be used for the infrared approach sensors.

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 discloses a multiplex circuit, an error amplifier and a multiplexed output low dropout linear regulator. The multiplexed output low dropout linear regulator comprises the error amplifier, the multiplex circuit and a feedback circuit and is characterized in that the error amplifier receives feedback voltage provided by the multiplex circuit through the feedback circuit, compares the received feedback voltage with reference voltage and outputs amplification signals to the multiplex circuit; the error amplifier outputs the voltage signals to provide bias voltage for the multiplex circuit; the multiplex circuit compares the amplification signals output by the error amplifier with the reference voltage to convert the amplification signals into the N voltage signals and outputs the voltage signals through N voltage output ends after amplifying the voltage signals. The LDO linear adjustment rate and the power voltage rejection ratio can be effectively increased, output noise and chip area are reduced, application complexity and cost are reduced, and application prospects are good.

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 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..

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 relates to a method for controlling a resonant converter having an input for receiving an input voltage, an output for providing an output voltage, the resonant converter comprising a resonant tank, a switching module, a transformer having a primary side and a secondary side, and a rectifier circuit, wherein the resonant circuit is coupled between the switch module and the primary side of the transformer and has a characteristic resonant frequency, the switching module comprises at least two power switches, the at least two power switches work at a switching frequency to drive the resonant circuit, and the rectification circuit is coupled between the secondary side of the transformer and the output end. The control method includes detecting an input voltage, and adjusting a switching frequency according to the input voltage and a reference voltage threshold, wherein the switching frequency is reduced when the input voltage is less than the reference voltage threshold.

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 multiplex circuit, an error amplifier and a multiplexed output low dropout linear regulator. The multiplexed output low dropout linear regulator comprises the error amplifier, the multiplex circuit and a feedback circuit and is characterized in that the error amplifier receives feedback voltage provided by the multiplex circuit through the feedback circuit, compares the received feedback voltage with reference voltage and outputs amplification signals to the multiplex circuit; the error amplifier outputs the voltage signals to provide bias voltage for the multiplex circuit; the multiplex circuit compares the amplification signals output by the error amplifier with the reference voltage to convert the amplification signals into the N voltage signals and outputs the voltage signals through N voltage output ends after amplifying the voltage signals. The LDO linear adjustment rate and the power voltage rejection ratio can be effectively increased, output noise and chip area are reduced, application complexity and cost are reduced, and application prospects are good.

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.

The invention relates to a current generated circuit which can integrate an over-voltage reducing device; the current is in direct proportion with the temperature (PTAT); the current generated circuit comprises a first cascode current mirror circuit and a second cascode current mirror circuit which are connected between a power supply Vcc and the ground in series; and the current generated circuit also comprises an over- voltage reducing device for restraining the impact ionization effect. The application of the current generated circuit can effectively reduce the drain-source voltage on the cascode device so as to reduce the influence of the impact ionization effect, without affecting the minimum operating voltage; therefore, the current generated circuit keeps the maximum gain of the current mirror structure and fundamentally solves the influence of impact ionization on the cascode, thereby improving the current benchmark linear adjusting rate.

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 direct-axis magnetic field-enhanced permanent magnet brushless motor with wide speed regulation for vehicles and its zoned magnetic regulation control is suitable for the field of electric vehicles with wide speed regulation, low speed, high torque and high efficiency. Its structure is composed of stator, rotor, non-magnetic bushing and rotating shaft. It is characterized in that the stator armature winding adopts distributed winding or modular winding; the rotor is uniformly embedded with permanent magnet steel along the circumferential direction, and adopts alternating distribution magnetization, increasing the number and thickness of the rotor quadrature axis magnetic circuit and the permanent magnet Steel forms a magnetic barrier in a certain relationship. The non-magnetic bushing holds the rotor core together and is closely connected to the shaft, resulting in a new class of direct-axis field-enhanced permanent magnet brushless motors. The feature of the invention is that the direct-axis inductance of this type of motor is greater than the quadrature-axis inductance, and cooperates with the zoned magnetic regulation control, inheriting the advantages of traditional permanent magnet synchronous power density, reliable operation, high efficiency, and high energy density, and further reducing copper consumption and energy density. Iron loss improves the efficiency of the motor and solves the problem that the traditional permanent magnet synchronization is difficult to achieve weak field control.

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.

According to the technical scheme, the intelligent elevator safety management system is characterized in that the intelligent elevator safety management system comprises a voltage stabilizing module, the voltage stabilizing module is electrically connected with a driving module, the driving module is electrically connected with an acquisition module, and the acquisition module is electrically connected with an elevator driver; the acquisition module is electrically connected with an output open-short circuit protection module, a sampling resistor open-short circuit protection module, an under-voltage protection module and an output overvoltage protection module; the voltage stabilization module is electrically connected with an over-temperature debugging module, and the over-temperature debugging module is electrically connected with a temperature detection module. The voltage output by the system is stably adjusted through the voltage stabilizing module, the circuit of the system is detected through the acquisition module, then the stable voltage is reversely controlled and adjusted through the feedback adjusting module, the stability and the safety of the system are kept, the temperature of the system is detected through the temperature detecting module, output of the adjusting current is achieved, and the stability and the safety of the system are improved. And carrying out cooling regulation on the system.

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.

The invention provides an LED linear driver, a driving circuit, a chip and a driving method, including a line voltage compensation module and a clamping circuit; Compensation current in a proportional relationship; the first input end of the clamp circuit is used to access the second reference voltage, the second input end is used to sample the voltage at both ends of the current detection resistor electrically connected to the LED linear driver, and the output end is connected to the first The compensation resistor is connected; when the voltage across the current detection resistor is greater than the second reference voltage, the NMOS tube is turned off, and all the compensation current flows through the first compensation resistor; when the voltage across the current detection resistor is equal to the second reference voltage, part of the compensation current flows Through the first compensation resistor, the voltage valley on the current detection resistor is clamped at the second reference voltage. The LED linear driver, the driving circuit, the chip and the driving method of the invention improve the linear adjustment rate of the LED linear driver.

The invention relates to a current generated circuit which can integrate an over-voltage reducing device; the current is in direct proportion with the temperature (PTAT); the current generated circuit comprises a first cascode current mirror circuit and a second cascode current mirror circuit which are connected between a power supply Vcc and the ground in series; and the current generated circuit also comprises an over- voltage reducing device for restraining the impact ionization effect. The application of the current generated circuit can effectively reduce the drain-source voltage on the cascode device so as to reduce the influence of the impact ionization effect, without affecting the minimum operating voltage; therefore, the current generated circuit keeps the maximum gain of the current mirror structure and fundamentally solves the influence of impact ionization on the cascode, thereby improving the current benchmark linear adjusting rate.