108results about How to "High voltage regulation accuracy" patented technology

The invention relates to a high-pressure reducing valve. A throttling hole which is communicated with an air inlet cavity and an air outlet cavity and a valve core which axially and movably penetrates through the throttling hole are arranged in a valve seat; the valve core is provided with a throttling conical surface which is in movable and sealing fit with a lower hole opening of the throttling hole in the air inlet cavity; the upper end of the valve core supports against a piston in a matching mode; the lower end of the valve core is elastically assembled in the valve body through an offsetting spring; the throttling conical surface of the valve core is axially arranged at the middle part of the air inlet cavity just opposite to the an air inlet; the lower end of the valve core is provided with a lower valve post which is assembled in the valve seat in a sliding and sealing mode; and the diameter of the lower valve post is equal to the aperture of the throttling hole of the valve seat. In the invention, the diameter of the lower valve post is equal to the aperture of the throttling hole of the valve seat so that an axial action force of inlet pressure acting on the valve core is zero so as to eliminate the influence of the fluctuation of inlet pressure on outlet pressure and improve the pressure stabilizing precision.

Provided is a method of controlling a bidirectional converter to charge and discharge a storage battery. The bidirectional converter adopts a double-loop control method, the inner loop is alternating current loop control, and the outer loop is direct current loop control. The direct current loop control can select direct current voltage outer loop control or direct current outer loop control according to different charging and discharging states of the storage battery; when the storage battery is in a constant current voltage-limiting charging state and a constant current discharging state, the direct current outer loop control and alternating current loop control of the bidirectional converter work simultaneously; when the storage battery is in a constant voltage current-limiting charging state and a floating charging constant-voltage charging state, the direct current voltage outer loop control and alternating current inner loop control of the bidirectional converter work simultaneously; the direct current voltage outer loop control and the direct current outer loop control are switched over smoothly; meanwhile, the bidirectional converter adopts a four-section type intelligent charging control and constant-current discharging control strategy for the storage battery.

The invention discloses a three-phase four-leg inverter and a control method thereof. The inverter is formed by a rectification circuit, a direct current filtering circuit, a three-phase four-leg inverter circuit, an alternating current filtering circuit, a sampling circuit, a DSP controller, an opto-coupler isolation circuit and a power supply circuit. An input terminal is parallelly connected with two energy storage capacitors which are connected in series. The each energy storage capacitor is parallelly connected with an equivalent voltage-sharing resistor respectively. The control method is based on a gamma component control method in a three-dimensional space vector. A traditional three-dimensional space vector is decomposed into a two-dimensional space vector and a gamma vector. A PI controller is combined. PWM of a fourth leg is generated through controlling the gamma component so as to carry out full compensation on output voltage imbalance caused by various kinds of factors. And the advantages of the two-dimensional space vector are fully used to control the previous three legs. The control method is simple and practicable. A dynamic response is fast. Voltage stabilization precision is high. The output voltage is balanced and a harmonic wave distortion rate is low. A good control characteristic can be possessed under the conditions of unbalanced and non-linear load.

This invention relates to three phase stabilizing regulator comprising microcomputer sampling controller, control circuit and three phase compensation transformer. The characters are: secondary winding of each phase of the transformer having only one coil, and series connected between power source and load; each primary winding having more than one coils and taps, each tap being connected to corresponding phase and zero line of input three phase power source by corresponding contactor of control circuit or contact of solid relay. The main control point is that: phase voltage and/or line voltage in regular or irregular order combination is imposed upon each coil of primary winding of compensationt ransformer, to achieve even compensation, lowering working current in primary winding of compensation transformer. Advantaegs are: simple structure, low cost, high stability precision.

The invention discloses an arc-free compensatory single phase voltage regulating and stabilizing device, including protection electric appliance, sample controller, control circuit and compensating circuit, and its characteristic: the control circuit includes several relays, the control coil of each relay is controlled by the sample controller and the corresponding contact of each relay controls the compensating circuit. The compensating circuit includes a compensating transformer, the secondary winding coil of the compensating transformer is connected in series between power supply and load and the primary winding coil is provided with several series coils, the tap terminal of each coil is connected with phase or zero lines through the corresponding contacts of several relays of the control circuit. In use course, the voltage and current is uninterrupted, the primary winding coil makes forward or backward compensation on the output of the secondary winding coil by making delayed and arc-free switching of different coil groups under the control of the sample controller and control circuit, realizing the function of adjusting and stabilizing output voltage. It is applied to single phase voltage adjusting and stabilizing power supply.

The present invention is one kind of DC-to-AC voltage conversion circuit and its control method. The DC-to-AC voltage conversion circuit is connected to a DC voltage source and used to convert the DCvoltage into stable output AC voltage. It includes mainly one power level transistor switch, one LC filter, one current sensor, one voltage feedback ctrl, one load current sensor, one pulse width modulator and one current command compensator. The present invention aims at utilizing the current sensor to feed back the inductive current of the LC filter for stabilizing voltage and utilizing the load current sensor to widen the controlled frequency band width and raise the voltage stabilizing precision so as to provide stable output AC voltage.

The invention relates to a mass method/standard meter method micro-flow water flow standard device. The device comprises a water storage tank which is connected with the lower end of a surge tank through a water pump, a high-level water tank is connected with the surge tank, the surge tank and the high-level water tank are connected with a front detected-meter header of a horizontal detected-flow-meter placement pipeline through electric switching valves respectively, the front detected-meter header is connected with two horizontal expansion joints in parallel, detected flow meters with different calibers are installed through the horizontal expansion joints, the two horizontal expansion joints gather on a front standard meter header, three standard meters with different calibers are installed at the outlet of the front standard meter header and connected to a rear standard meter header, two vertical detected-flow-meter placement pipelines are connected through the rear standard meter header, detected flow meters can be installed on the vertical detected-flow-meter placement pipelines through vertical expansion joints, three redirectors with different calibers are arranged at the tail ends of the two vertical detected-flow-meter placement pipelines in a connected mode, and one water outlet of each redirector corresponds to a weighing container.

The invention discloses a central air-conditioning temperature zone controller which is characterized by comprising a power module, a temperature acquisition module, a control module, a signal conversion module, an on-off valve control module and a communication module. The temperature acquisition module is connected with the control module. The control module is further connected with the signal conversion module, the on-off valve control module and the communication module. The signal conversion module is further connected with the on-off valve control module. The power module supplies power to the temperature acquisition module, the control module, the single conversion module, the on-off valve control module and the communication module. The central air-conditioning temperature zone controller is wide in application range and high in control precision.

The invention discloses an intelligent fuel gas pressure regulator and an application method. The pressure regulator comprises a valve body, a valve element, a valve rod and a disconnecting device. The valve body comprises an inlet cavity and an outlet cavity. The valve element and the valve rod are arranged in the valve body. The pressure regulator further comprises a valve element pushing device, a leakage sensor and a displacement sensor. The leakage sensor is arranged on a valve body upper membrane shell, and the displacement sensor is arranged on a bottom cover of the valve body. The valve element pushing device comprises a bourdon tube, an electric actuator, a spring seat, a spring and a leas screw, wherein the spring is arranged on the spring seat, and the spring seat is arranged in the bourdon tube; the electric actuator is fixed to the top of the bourdon tube, and an output shaft of the electric actuator is connected with the lead screw; and a nut is fixed to the spring seat and is in threaded connection with the lead screw. According to the intelligent fuel gas pressure regulator and the application method, the structure of the regulator is reasonable, the components of the electric actuator, the leakage sensor, the displacement sensor and the like are arranged, remote control, fault self-diagnosis and outage self-regulation are integrated, and the regulator has the characteristics of being safe, practical, high in reaction speed, and high in pressure stabilizing precision.

The invention discloses an on-line high-frequency UPS (Uninterrupted Power Supply) inverting control method. The control method comprises the following steps: A, an error signal is obtained in the way that a reference voltage and a output voltage, which are subjected to processing and generated by the inside of a DSP(Digital Signal Processor) chip minus a direct current component controlling quantity ; B, a corrected error signal is obtained in that way that after being input by a repetitive controller, one error signal is superimposed with another error signal; C, the corrected error signal is used as a current loop reference value after subjected to proportional resonance control and amplitude limiting sequentially; D, a current loop output signal is obtained in the way that after the error of the calculation of the current loop reference value and circuit sampling inductance current is taken out, the proportional calculation is performed; E, a control signal is obtained by the current loop output signal superimposing with a duty cycle feedforward quantity, so as to control an ePWM (Pulse-Width Modulation) wave emission module to emit PWM to drive a waveform. The method adopts a complex control scheme, is high in voltage stabilization precision, strong in control capability and good in sine; the smooth transition can be realized in the process of start-up and stopping of equipment to avoid impact; the method can be widely used in the field of inverting control.

The invention relates to the technical field of power supplies, and discloses a single-phase precision alternating-current voltage stabilizer. The single-phase precision alternating-current voltage stabilizer aims to solve the problems that a voltage stabilizer in the prior art is unable to be adjusted precisely, and is not high in voltage-stabilization precision. The technical scheme of the single-phase precision alternating-current voltage stabilizer includes steps as below: the voltage stabilizer comprises an automatic control circuit and the like. The single-phase precision alternating-current voltage stabilizer is characterized by comprising an overlapping compensation transformer (DB), and the transformer (DB) comprises an iron core, an overlapping compensation coil (DB-1), and an overlapping excitation coil (DB-2) with more than one tap. A phase line input end (A), a compensation coil (BB-1), an overlapping compensation coil (DB-1), and a phase line output end (a) are connected in series sequentially. The overlapping excitation coil (DB-2) achieves changeable connection through being connected with a component (LY). The single-phase precision alternating-current voltage stabilizer has the advantages of improving output voltage stabilization precision greatly and the like.

The invention relates to a digital-analog hybrid control circuit and a control method of a DC-DC converter. Inductance voltage is converted into current, and a first current controls an oscillator to generate a corresponding frequency signal as a clock of a digital filter; the digital filter performs calculation according to the PWM signal in each clock period so as to generate an inductive current digital signal with the same phase as the inductive current; on one hand, the difference between the output voltage and the reference voltage of the DCDC converter is converted into a digital signal by the analog-to-digital converter and then a compensation signal is obtained by the digital compensator, and on the other hand, the output voltage and the reference voltage are processed into a current iico 2 by the second transconductance amplifier and converted into a frequency signal by the second current control oscillator to serve as a clock of the second counter. The second counter starts counting at the falling edge of the PWM signal, and the PWM rising edge stops counting and is reset, so that a slope signal is generated; the compensation signal and the slope signal are added and then compared with an inductive current digital signal, when the inductive current digital signal is smaller, the PWM signal is controlled to be turned up, and after fixed conduction time, the PWM signal is turned down.

The invention discloses a single-phase inverter stabilizer control method and a device thereof; wherein, the method comprises the steps as follows: the practical output voltage modulus of the inverter is gained; the error of the practical voltage modulus is gained according to the given output voltage modulus and the practical output voltage modulus; the error is adjusted by integral and by multiplying a cosine value with the given phase so as to gain a first adjusting quantity; according to the first adjusting quantity, the output voltage of the inverter is adjusted; the device comprises a practical output voltage modulus gaining unit, a subtracter, an adjuster and a multiplier; the practical output voltage modulus gaining unit gains the practical voltage modulus and outputs the practical voltage modulus to the subtracter, which gains the error according to the given voltage modulus and the practical voltage modulus and outputs the error to the adjuster, which carries out integral adjustment on the error and outputs the value to the multiplier, which multiplies the value output by the adjuster with the cosine value with the given phase so as to gain the first adjusting quantity and outputs the first adjusting quantity to the inverter. The invention has the advantages of high stabilizer precision and quick dynamic response speed.

The invention relates to a power system of a vehicular interaction device. The power system comprises a protection circuit, a voltage stabilization circuit, a monitoring control circuit and a non-contact control switch, wherein the protection circuit is connected with the voltage stabilization circuit; the voltage stabilization circuit is connected with the monitoring control circuit; the voltage stabilization circuit is also respectively connected with all functional circuits through the non-touch control switch; and the monitoring control circuit is connected with a central processor. The power system of the vehicular interaction device ensures that all the functional circuits have high voltage stabilization precision, avoids the device from being damaged by controlling values of input current and voltage, prevents procedures from generating dead circulation to cause the whole device to be powered off, and has good anti-jamming property.

The invention discloses a dual-edge constant-turnoff-time modulating voltage type control method and a dual-edge constant-turnoff-time modulating voltage type control device for a switching converter. The turnoff and turn-on of a switching tube of the switching converter are controlled according to a relation between an output voltage and a voltage reference value by adopting a control time sequence consisting of constant turnoff, turn-on and constant turnoff or a control time sequence consisting of turn-on, constant turnoff and turn-on. The method and the device can be used for controlling switching converters of multiple topological structures such as a Buck converter, a Buck2 converter, a Cuk converter, a Zeta converter, a single-tube forward converter, a double-tube forward converter, a push-pull converter, a push-pull forward converter, a half-bridge converter, and a full-bridge converter, and have the advantages of no need of any compensation network, easiness in controlling, high transient response speed and high voltage stabilizing accuracy.

This invention relates to a high pressure accurate basket booster used in gas transmission and to adjust gas pressure, which comprises main valve, stabilizing valve, bossing valve, wherein the main valve uses rubber film as drive structure and uses valve bar, core and socket as execution structure; the stabilizing valve is composed of valve case between upper and down covers and valve bar in the case and spring and rubber film; the main valve cover and core are matched with column steps designed as screw shape; the inner chamber is opened with ring gas tank without terminating sealed requirement.

The invention relates to a magnetic amplifier based switch power supply self-feedback circuit and a control method therefor. The self-feedback circuit comprises an output rectification filter circuit, an error amplifying circuit, a reset control circuit and the magnetic amplifier; the output rectification filter circuit is used for converting the alternating current voltage from the secondary output of a transformer into direct current voltage through rectifying and filtering; the error amplifying circuit is used for sampling and amplifying the output direct current voltage; the input end of the error amplifying circuit is connected with the output rectification filter circuit while the out end of the error amplifying circuit is connected with the reset control circuit; the reset control circuit is used for controlling the voltage duty ratio on the magnetic amplifier for realizing the automatic regulation of the output voltage; the magnetic amplifier is used for controlling the magnetization state through the reset control circuit; according to the rectangular hysteresis loop characteristic, when the magnetic amplifier is unsaturated, the magnetic amplifier is in a high-resistance state and the circuit is switched off; and when the magnetic amplifier is saturated, the circuit is switched on. The magnetic amplifier based switch power supply self-feedback circuit has the characteristics of low space occupation, simple circuit structure, low dissipation power, high voltage-stabilizing precision and the like.

The invention relates to the technical field of hydraulic valves, and discloses a pressure reduction and stabilization valve. The pressure reduction and stabilization valve comprises a valve housing; a liquid inlet and a liquid outlet are respectively formed at the two ends of the valve housing; a first sensing element and a second sensing element are arranged between the liquid inlet and the liquid outlet; the liquid channels of the first sensing element and the second sensing element are respectively communicated with the liquid inlet and the liquid outlet; the stressed part of the first sensing element is arranged opposite the stressed part of the second sensing element; a pressure cavity is formed between the two stressed parts; the pressure cavity is communicated with both the fluid channel of the first sensing element and the fluid channel of the second sensing element. The pressure reduction and stabilization valve has high pressure stabilization accuracy, and can be used at the occasions having high requirements for pressure stabilization.

The invention discloses an input-output common ground based high-voltage adjustable step-down circuit. A high-voltage alternating current or a high-voltage direct current of a high-voltage input end enters a switch integration circuit through bridge rectification and pi filtering; the switch integration circuit is connected with a typical BUCK step-down circuit; a voltage stabilization reference circuit provides a voltage stabilization reference voltage and turns on a photoelectric isolator; the photoelectric isolator provides a feedback voltage; and the photoelectric isolator is used for feedback isolation between a high-voltage input and a low-voltage output, so that the interference of a high-voltage-side signal on a low-voltage-side signal is reduced. The high-voltage direct current or alternating current is converted into a low-voltage direct current; a resistance value of a slide rheostat is changed to obtain different low-voltage direct-current voltages; and the high-voltage adjustable step-down circuit can be widely applied to step-down circuits of high-voltage switches, especially certain instrument devices with requirements of converting commercial power into a direct-current low-voltage adjustable power supply.

The invention relates to a switching type stabilized voltage supply circuit. Although a traditional linear stabilized voltage supply is simple in circuit structure and reliable in operation, the traditional linear stabilized voltage supply has the defects of being low in efficiency, large in size, large in copper consumption and iron consumption, high in working temperature, small in adjusting range and the like. The switching type stabilized voltage supply circuit comprises a control circuit, a rectifying filter circuit, a high-frequency exchange circuit and a pulse-width modulation square-wave rectifying filter circuit. The control circuit is composed of a sampling circuit, a comparison circuit and a pulse-width modulation circuit, the sampling circuit, the comparison circuit and the pulse-width modulation circuit are sequentially connected in series, the pulse-width modulation circuit is in series connection with an oscillating circuit, the comparison circuit is in series connection with a reference voltage circuit, the sampling circuit of the control circuit is connected with the pulse-width modulation square-wave rectifying filter circuit, efficiency of the pulse-width modulation circuit, the high-frequency exchange circuit and the switching type stabilized voltage supply circuit can reach more than 85%, and the stabilized voltage range is wide. In addition, the switching type stabilized voltage supply circuit has the advantages of being high in voltage stabilizing precision, free of a power transformer and the like.