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

The invention provides an LED illumination driving current linear adjustment and dimming control circuit. The LED illumination driving current linear adjustment and dimming control circuit comprises an AC power supply module, an LED module, a driving IC, a dimming control module and a linear current adjustment module. When an input voltage is increased, the linear current adjustment module can control a current flowing through the LED module to be reduced, so that the balance of the input power is achieved, and the linear adjustment rate of the LED module is further improved. The dimming control module can change the change of the internal reference voltage of the driving IC through the change of an external input voltage, thereby realizing the change of the current of the LED module, maintaining the current driving part in a matched manner, and switching on / off a maintaining current path. Therefore, the circuit can be suitable for the silicon controlled dimming application, and meanwhile, the structure can be compatible with 0-10V and a pulse width modulation (PWM) driving mode, so that the applicability can be 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 relates to a segmented LED driving circuit, which includes an LED module, which includes several strings of LED lamp strings connected end to end; a power tube module, which includes several power tube modules corresponding to the number of LED lamp strings. tube, and each power tube corresponds to only one string of LED lights; the power factor adjustment module includes several voltage comparison units corresponding to the number of power tubes, and each voltage comparison unit corresponds to only one power tube ; A reference source module, which includes several voltage output terminals and a reference signal output terminal corresponding in number to the voltage comparison unit, and the circuit also includes a constant current compensation module. Using the segmented LED drive circuit of the present invention, the LED drive current changes with the AC input voltage through the segmental conduction of the switch, thereby obtaining a higher power factor, and at the same time, a higher linear adjustment rate is obtained through the constant current compensation module. The structure is simple and the application range is wide.

The invention provides an LED drive circuit and its control circuit suitable for silicon controlled rectifier dimmers. The control circuit includes: a dimming phase detection circuit; a phase filter circuit connected with the dimming phase detection circuit; A connected nonlinear reference circuit; a zero-crossing detection circuit coupled directly or indirectly to the output of the LED drive circuit; an output current analog circuit connected to the zero-crossing detection circuit; an average circuit connected to the nonlinear reference circuit and the output current analog circuit A current loop adjustment circuit; a reset circuit connected with the average current loop adjustment circuit; an intermittent delay circuit connected with the phase filter circuit; a main drive circuit connected with the reset circuit, the intermittent delay circuit and the zero-crossing detection circuit. The invention can realize high power factor single-stage dimming, and has the characteristics of no flicker, good compatibility and the like.

The present invention provides a LED lighting drive current linear adjustment and dimming control circuit. The LED lighting driving current linear adjustment and dimming control circuit includes an AC power supply module, an LED module, a driver IC, a dimming control module and a linear current adjustment module. When the input voltage increases, the linear current adjustment module can control the current flowing through the LED module to decrease, so as to achieve the balance of input power, and then improve its linear adjustment rate; Change the internal reference voltage of the driver IC to change the current of the LED module, and cooperate with the maintenance current drive part to open and close the maintenance current path, so that it can be applied to thyristor dimming applications, and the structure is compatible with 0‑10V And PWM (Pulse Width Modulation; Pulse Width Modulation) drive mode, which can improve applicability.

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 an intelligent power control circuit which comprises a voltage sampling module, a power control module and a constant-current control module. An input end of the voltage sampling module is connected with a first end of a power tube, an output end of the voltage sampling module is connected with an input end of the power control module, an output end of the power control module is connected with an input end of the constant-current control module, an output end of the constant-current control module is connected with a third end of the power tube, the voltage sampling module adopts a resistance sampling circuit, the power control module adopts a current mirror circuit, and the constant-current control module adopts a computing comparison circuit. In application of the intelligent power control circuit, the input voltage is detected at the beginning of running of the power tube to reduce power consumption of a driver and limit temperature rise of the power tube so as to reduce cooling cost of the driver and an LED lamp; in addition, the intelligent power control circuit is simple in structure and wide in application range.

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 reference source. The reference source includes a first current generating circuit, a second current generating circuit and a current subtraction circuit, the first input end of the first current generating circuit is electrically connected to the first power line, and the second input end is electrically connected to the second power line , the first input end of the second current generation circuit is electrically connected to the first power line, the second input end is electrically connected to the second power line, the first input end of the current subtraction circuit is electrically connected to the first power line, and the second The input end is electrically connected to the second power line, the first control end is electrically connected to the output end of the first current generating circuit, and the second control end is electrically connected to the output end of the second current generating circuit. The invention eliminates the influence of the voltage variation of the first power line and the second power line on the current of the current source, and improves the linear adjustment rate of the reference source.

The invention discloses a neural network-based low linear adjustment rate reference circuit and its generation method. This application aims to solve the problem of poor linear adjustment rate of the prior art reference circuit. The temperature-independent reference voltage is generated by the voltage difference between the electrode and the emitter and the circuit topology; this application generates the control voltage required by the LNR adjustment circuit through the artificial neural network, and uses the inherent nonlinear mapping ability of the artificial neural network itself to generate a reference voltage for the power supply. The voltage is a control voltage with a nonlinear function. The voltage increases the grid voltage of the current mirror in the circuit by adjusting the PSR, so that the local voltage at low frequencies basically does not change with the power supply voltage, thereby significantly reducing the LNR of the reference voltage and overcoming the inability to achieve in the prior art. The control voltage of the nonlinear function is used to adjust the difficult problem of the reference voltage; the application is applicable to the related fields of the reference circuit.

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.