127 results about "Line regulation" patented technology

A circuit and corresponding method for reducing standby power and improving no-load to full-load regulation for ringing choke converters by maintaining a reduced duty cycle, with longer off time at no-load, while maintaining the output voltage swing closer to the full-load level. This reduced duty cycle prevents the output voltage from swinging high with respect to the full-load level, thereby providing good no-load and full-load output regulation in open feedback loop systems. The circuit and method provides very low no-load switching frequency and duty cycle by increasing the off time of the main switch through use of a turn off transistor driven by a zener diode, thereby maintaining conduction even with a very small control current and prolonging the off time of the main switch. The circuit and method achieves the benefits preferably using only less costly basic discrete converter components instead of more costly integrated circuits.

The invention discloses a cold-rolled strip steel plate shape control system and method. An advanced feedforward-feedback cooperative control architecture is adopted and after a plate shape automatic control system is put into on-line operation, plate shape variation and outlet plate shape real-time deflection caused by changes of convexity and rolling force are jointly calculated out by calculating links of the plate shape variation and the outlet plate shape real-time deflection which are caused by the changes of the convexity and the rolling force; and then an on-line regulation variable for control of a cold-rolled strip steel plate shape is calculated out at an optimal regulation variable calculating and amplitude limit processing link of a plate shape control mechanism. The time-delay influence of strip steel in transmission between a rolling mill and a plate shape gauge is eliminated and the precision for estimating the plate shape is ensured; and the technical problem of outlet plate shape quality variation caused by practical factors such as the convexity change and the rolling force fluctuation of supplied materials during the rolling process can be solved, so that the quality of cold-rolled strip steel products is enhanced remarkably.

The invention relates to a solid-state fermentation method for ethanol production based on sweet sorghum stalks (including other sugar raw materials, such as, sugar beet, sugar cane, Jerusalem artichoke, etc) and a system, which pertains to the technical field of the processing of biomass liquid fuel. The method mainly includes the following key processes and core equipments: (1) smashed materials are fed into a tank with the help of the rotary motion of a cylinder body of a rotating drum type solid-state fermentation tank and the dual-function of the inclined angle of the tank body (1 to 15 degrees) and a feeding stirring board so as to be evenly mixed with the high-yield ethanol TSH-Sc-1 yeast liquid which is prayed from a sprayer; (2) the solid-state fermentation is carried out in the facultative oxygen environment, the fermentation tank is rotated at an even speed to promote the mixing of materials and the strengthening of heat transfer, thus the fermentation is always in a best condition and the fermentation time is shortened; (3) on-line monitoring is carried out: the solid-state fermentation is affected by a plurality of factors, such as, the distribution of the on-line regulation temperature of a computer, spray amount, the concentration of dissolved O2, filling factors, the mixing degree of the smashed materials and the yeast liquid, the pH value of yellow slurry, CO2 concentration, ethanol concentration, the migration of bacteria species and other parameters so as to ensure that the solid-state fermentation is carried out under a best working condition; (4) the automatic discharge of the fermentation material from the tank is realized with the help of the rotation of the tank body and the push of a discharging stirring board, and a closed tunnel belt is adopted for conveying the fermentation material to an ethanol-dreg separation unit.

A method and apparatus for power conversion in a class D amplifier is provided. The power conversion is achieved using synchronous rectifiers in a regulated half bridge power supply, taking the sum of the positive and negative rails as feedback, in order facilitate energy transfer between positive and negative output rails. This minimizes the effects of off side charging and rail sag, as well as achieving good line regulation, while allowing use of very small, low value output capacitors.

The invention discloses a linear constant current controller, which comprises a chip of the controller, a driving device and an illuminating lamp. The controller is connected to an input voltage source by a constant current source load. The linear constant current controller is characterized in that: the input voltage source provides one-way pulsating power grid voltage for the voltage rectification of an alternating current power grid. The controller comprises a power grid current control circuit and an error amplification circuit, wherein the power grid current control circuit controls the acquisition of power grid current in a current-gaining window of the one-way pulsating power grid voltage based on a voltage division signal from the input voltage source and an amplified error signal; and the error amplification circuit determines the average current of the power grid current based on a detection signal for the power grid current flowing from the power grid current control circuit, and generates the amplified error signal. The efficiency of the linear constant current controller provided by the invention can be remarkably improved; and the linear constant current controller has relatively lower cost and can achieve a relatively higher line regulation rate and a relatively higher load regulation rate at the same time.

An electronic amplifier circuit comprising an operational amplifier circuit, such as a two-stage operational amplifier circuit, in tandem with a operational transconductance amplifier. The electronic amplifier circuit has high open-loop gain and high gain-bandwidth while maintaining stability over a wide range of operating parameters.

Systems and methods disclosed herein monitor and control input to a converter in one or more of a UPS, a frequency converter, or a line conditioner. Distortion due at least in part to ripple voltage can be removed from a control signal that controls input current to the converter. The systems and methods described herein afford a simple and effective way to reduce or eliminate one or more of subharmonic oscillation and total harmonic distortion from a converter input current during synchronous and asynchronous modes of operation. The converter may include one or more of a rectifier and an inverter.

A low drop-out (LDO) voltage regulation circuit includes first and second internal current paths. The first internal current path is between the input supply voltage and ground and includes the regulator's buffer circuit. The second internal current path is between the input supply voltage and ground and includes the regulator's power transistor. The amount of current flowing through the first internal current path relative to the amount of current flowing through the second internal current path is an increasing function of a current supplied to a load connected to the output supply node. The load regulation of the LDO is improved as the DC gain will not go down at lower load currents. Further, the no load to full load response time is improved as the load pole and power MOS gate pole are actively controlled with respect to output load current. In this mechanism, as the amount of current being supplied to the load decreases, the internal current flow shifts from the first internal current path to the second internal current path and vice versa. This arrangement maintains the desired pole structure and keeps the quiescent current largely the same for all load current levels.

Techniques for efficiently stabilizing an output voltage produced by a voltage regulation circuit are disclosed. One embodiment pertains to a voltage regulation circuit that includes a supplemental current source that can be controllably activated to provide a supplemental current to an output terminal of the voltage regulation circuit. This supplemental current can then assist in stabilizing the output voltage level at the output terminal of the voltage regulation circuit even in the presence of high current surges by a load (i.e., electronic circuitry). Advantageously, given the availability of the supplemental current, the required amount of capacitance for a decoupling capacitor (also coupled to the output terminal of the voltage regulation circuit) can be significantly reduced. In the case of semiconductor electronic devices, the reduction in the needed capacitance yields substantial die area savings with respect to decoupling capacitors.

The invention relates to the technical field of road traffic and provides an urban road traffic management system based on a dynamic marker line. According to the traffic flow peak of an urban road, the urban road traffic management system based on the dynamic marker line adjusts the display state of the dynamic marker line on a road and traffic flows in different directions of the urban road at regular time. The urban road traffic management system comprises a traffic flow data acquisition module, a data storage module, and a dynamic marker line regulation and control module. The dynamic marker line regulation and control module is used for timely obtaining data m which is sent by the data storage module at regular time, adjusting the display state of the dynamic marker liner according the value of m, and changing the display state of the dynamic marker line, wherein a main urban road with a small traffic flow is changed from an original multilane into a single lane, meanwhile other lanes in the same direction as the single line are changed into lanes in an opposite direction, so as to increase the number of lanes in the opposite direction and to reduce the current traffic flow. The urban road traffic management system provided by the invention achieves reasonable adjustment for imbalance usage of the road surface of the urban main road at some period, and can effectively solve the traffic jam problem.