49 results about "Control impulse" patented technology

The invention relates to an autonomous orbit control method for a stationary orbit satellite, belonging to the technical field of autonomous orbit control of the satellite. The autonomous orbit control method can be applied to a long-term operation management task of the stationary orbit satellite. After the satellite goes beyond a specified error box in east-west direction or south-north direction, corresponding autonomous orbit maintenance is required to be performed; and meanwhile, by considering the regularity for drift of the satellite along a stationary orbit and error of an autonomous navigation result, the effectiveness of control quantity and the rationality of time interval between every two control processes are required to be judged at each time when the orbit control quantity of the autonomous orbit, i.e., control impulses in the south-north direction and the east-west direction which are delta VNS and delta VEW respectively, are calculated. The method has been successfully applied to china satellites; a remote sensing result shows that the autonomous control strategy of the satellite is correct; and the method can be widely applied to all geostationary orbit satellites required to have the autonomous function.

The invention discloses an autonomous orbit control method for a low-orbit remote sensing satellite. The autonomous orbit control method comprises the following steps that firstly, the deviation between a current orbit semi-major axis and a nominal orbit semi-major axis is calculated on orbit in real time; secondly, the length of working time of an orbit-control engine is acquired according to orbit-control impulse, an apogee position is acquired through orbit extrapolation calculation autonomously, the time that the satellite arrives at the apogee position is taken as an orbit-control center moment, and the moment that the engine begins to ignite and the moment of brennschluss are acquired according to the length of working time of the orbit-control engine and the orbit-control center moment; and thirdly, the orbit-control engine is controlled to ignite autonomously according to the moment that the engine begins to ignite in the second step, then the orbit-control engine is controlled to conduct brennschluss autonomously according to the brennschluss moment in the second step, and finally the low-orbit remote sensing satellite completes state recovery. According to the autonomous orbit control method for the low-orbit remote sensing satellite, on-orbit autonomous compensation of the orbit semi-major axis error can be achieved on the condition without ground station support, the ground operation control cost of the satellite is lowered, and abilities of autonomous management and autonomous operating of the satellite are promoted.

The invention discloses an on-off device and a control realization method thereof. The method includes the steps that a control audio frequency with specific audio frequency attributes is detected, and acoustic-electric conversion processing is conducted on the control audio frequency to obtain a specific impulse sequence; matching is conducted on the specific impulse sequence and a preset on-off control impulse sequence, and whether an on-off control signal is output to a controlled electric appliance or not is selected according to a matching processing result. In the on-off device and the control realization method of the on-off device, a user can use clapping sound or other control audio frequencies with specific audio frequency attributes to achieve on-off control of controlled electric appliances; in the specific realization process, the voice recognition technology and an unconventional voice operated switch do not need to be used, and the on-off device and the control realization method of the on-off device have multiple advantages of being high in identification, high in reliability, high in adaptability and low in cost.

The invention relates to a method and system of non-scanner impulse modulating three-space imagery. Impulse laser emits optical pulsing light testing scene; reflected light is inputted into receiver through image system and its output is connected with video camera set; the output of video camera set is connected with image handling device; one of modulating signal controller controls impulse laser or probing laser impulse; while another one controls functional light receiver set and video camera set and transmits the signal to image handling device at the same time. The gain of functional light receiver is time variable function. It uses intensity image of at least two laser impulses light with different intensity or the gains of functional receiver as different time variable function, then generates three-space imagery by computing. The range-measuring system doesn't have scan parts.

This invention discloses one voltage feedback intelligent control alternating contactor, which comprises coil operation module, self-switching power part, central control module, drive and protective module and voltage protective test module. The process is the following: alternating power entering coil operation module after commutation through choppers to provide power to coil; the central control module receives voltage test module to test power voltage signals to control the output voltage occupancy; the drive circuit provides power part control impulse. By adopting super voltage feedback to match electrical magnetic iron and reverse characteristics to reduce iron core and touch probe spring. When the touch probe operates electrical iron and self adjusts chopper to make coil supply voltage to save energy.

The utility model discloses a controller of permanent magnetism structure based on pulse-width modulation technology, and comprises a winding power supply module and a pulse-width modulation controlling module, wherein the winding power supply module comprises a rectification filter circuit and a voltage-reducing chopper circuit connected with the rectification filter circuit; while the pulse-width modulation controlling module comprises a time delay circuit, a control signal regulating circuit and a PWM control circuit. The utility model adopts the working process that alternating current is first rectified and filtered, and then flows through the voltage-reducing chopper circuit in order to turn into required adjustable direct chopping voltage; then the voltage is loaded on the winding of the permanent magnetism structure; and a control impulse is output from the PWM control circuit and adjusts the control voltages on the ends of the winding by opening or closing a power switch in the voltage-reducing converter. The utility model can control the new permanent magnetism structure with automatic and specific cutoff function without separate tripping, and has the advantages of simple structure, compact, steady control process, strong anti-interference and low cost.

The present invention relates to a digital pulsed consumable electrode gas shielded welding control method, belonging to the field of welding technology. It is characterized by that it adopts a cascade-connected three-closed-loop control structure, its internal loop is current loop, second loop is voltage loop and external loop is metal transition loop, every loop is equipped with a regulator, these regulators can be used for respectively controlling impulse current, arc length and metal transition process. Said invention adopts an all-digitalization pulsed consumable electrode gas shielded welding control system made up by using high-speed digital signal processor as kernel control device. Besides, said invention also provides the working principle of said system and its concrete operation method.

The invention relates to a light source and relative light-emitting diode control circuit for adjusting light. Said control circuit can be used to control the brightness of several groups of light-emitting diodes in liquid crystal display. Said control circuit comprises a control impulse generator and several light-emitting diode direct-current power source suppliers; said generator is used to receive one brightness adjusting signal, to generate several groups of brightness control impulse signals with same frequency and different phases; the working period of brightness control impulse signal is changed in one preset range based on the brightness adjustment signal; the light-emitting diode direct-current current supplier is coupled to the control impulse generator, to drive relative light-emitting diode based on the brightness control impulse signal.

A test method and the device for the temperature rise of direct current electric engine connects the rectifier, the PWM chopper and the filter between the power input and the tested engine. The impulse controlled input of the chopper is connected with the controlled impulse output of a controlled unit. A sine signal generated by a controlled unit plus with the DC voltage given value to get a impulse signal which minus the signal of the triangle wave generator, the result is transferred to the PWM generator to generate a PWM signal as the controlling signal of the PWM chopper which the output voltage is an impulse voltage acted on the tested electric engine. The speed of the electric engine is changed by adjusted the breadth, the frequency of the sine wave and the DC given value. If the virtual value of the AC for the electric engine is same with the rating DC value, the temperature rise test can be done. The system is simple and the working strength has decreased, the efficiency is improved.

The invention discloses a driving method for a three-dimensional probe in a three-dimensional / four-dimensional ultrasonic imaging system. The driving method is used for driving and controlling a stepping electric motor of the three-dimensional probe, and comprises the following steps of selecting the model of the three-dimensional probe of the three-dimensional imaging system; setting electrical and mechanical structure parameters of the three-dimensional probe; setting application parameters of the three-dimensional imaging system; initializing a control model; calculating parameter values needed in the control process according to the parameters of the system and the probe; and carrying out operational control according to the model of a control state machine. The driving method for the three-dimensional probe in the three-dimensional / four-dimensional ultrasonic imaging system has good compatibility and control performance, and can be suitable for a three-dimensional probe of a stepping electric motor in any model, by means of sine control impulse and an electrical control subdivision method, vibration of the probe is greatly reduced, and interference of relatively-large power driving harmonic waves on system signals is greatly reduced.

The invention relates to the technical field of radar detection, and in particular relates to a transmitting-receiving shared antenna applied to a high-frequency ground wave radar. The transmitting-receiving shared antenna disclosed by the invention is characterized by comprising a monopole transmitting-receiving shared antenna body, a transmitting-receiving shared antenna switch, a first electrical tuning ring antenna, a control impulse forming circuit, a control voltage forming circuit, a first electrical tuning ring antenna transmitting-receiving control circuit, a second electrical tuning ring antenna and a second electrical tuning ring antenna transmitting-receiving control circuit. By using the transmitting-receiving shared antenna, the problems that because the occupied area of the antenna system of the ground wave radar is large, a radar target is large and easy to damage, an ideal erecting field is not easily found and the like can be solved.

The invention discloses a maximum power factor control method of an intermediate frequency power supply induction heating apparatus. The method has the following steps: a current transformer is used to measure intermediate frequency power supply current; a controller controls impulse by a power inverter to calculate intermediate frequency power supply voltage; phase comparison is carried out on the intermediate frequency power supply current and intermediate frequency power supply voltage and the intermediate frequency power supply power factor is calculated; the controller controls the frequency of the intermediate frequency power supply induction heating apparatus according to the power factor to enable the intermediate frequency power supply induction heating apparatus to maintain the maximum power factor. In the invention, the intermediate frequency power supply induction heating apparatus can maintain the maximum power factor which normally can reach more than 97%.

The invention discloses a control method of a motor train unit rectifier based on a two-step predictive current controller. The control method comprises the following steps that 1, a current prediction model of the motor train unit rectifier is constructed; 2, a current prediction model under an alpha-beta static orthogonal coordinate system is constructed; 3, two-step predictive time-delay compensation is conducted according to the current prediction models obtained in the step 1 and the step 2 to obtain two-step predictive current vectors; 4, two-step predictive values of currents under a d-q rotating coordinate system are obtained according to the current vectors obtained in the step 3; 5, the two-step predictive values, obtained in the step 4, of the currents are calculated by adopting a quality function to obtain quality function values, the minimum value in the quality function values is selected, a control voltage vector corresponding to the minimum quality function value is obtained, and a corresponding control impulse is directly output in the next sampling period. The control method has the advantages that the quick dynamic response characteristics and the harmonic suppression effect are high, total harmonic distortion is low, small current distortion is generated, and the dynamic response speed is high.

The invention provides a quadrature phase shift keying (QPSK) carrier lock detector, and aims to provide a device which can realize QPSK carrier synchronous loop lock indication. The QPSK carrier lock detector is realized through a technical solution which is characterized in that a carrier synchronous loop numerically controlled oscillator (NCO) circuit outputs a control impulse; an integrated number clearing filter performs integrated number clearing operation on an input zero intermediate frequency branch signal in response to a control impulse; an amplitude distribution statistics result of a signal in two intervals is obtained from an integrated number clearing operation result through an absolute value circuit and two interval statistics circuits; an operation result of a first interval is obtained through multiplying the statistics result of the first interval by a lock threshold coefficient; an operation result of a second interval is directly used as the operation result of the second interval; the operation results of the two intervals are simultaneously input into a comparator; the operation results from the two intervals are compared; and an indication which determines whether the QPSK carrier synchronous loop is locked is output. Compared with an existing QPSK carrier synchronous lock detecting method, the QPSK carrier synchronous lock detector has advantages of wider signal-to-noise range and lock indication with lower determination error rate.

The invention provides a continuous plasma jet ignition exciter unit, comprising a protective circuit, an inverter circuit, a dual loop control circuit, an output circuit and a high frequency high voltage arc generator. The ignition exciter unit is used for providing low current excitation for a plasma jet ignition exciter unit of a gas turbine. The ignition exciter unit adopts a modular design of high frequency switching power supply, thus improving efficiency, and reducing volume and weight; a PWM is adopted to modulate and control impulse width, and the output is stable low current; the dual loop control circuit is adopted to control working mode by means of stabilizing current and restricting voltage, and the output is characterized by steep fall of voltage and constant current of electric current, so that the ignition exciter unit avoids being burned when the output short-cuts.

The invention relates to a controller which can inhibit the mechanical impact of a converter body, which is characterized in that the controller uses four electric motors for the tilting of a converter, four driving control devices are adopted, the direct current main loop output ends of the four devices are connected in parallel to control the four electric motors, wherein one of four devices isused as a main control device, and the other three devices are used as driven devices, the main control device is provided with a voltage ring and an electric current ring, and the control impulse phase angles of the driven devices are received from main control impulses. The invention guarantees the same length of cables arranged from a rectifier transformer to each device, reduces the relay interlocking inside a driving control system, and increases the reliability of the system, can conveniently read each parameter of the driving system in order to display pictures and monitor, can meet the index requirements of production devices, and ensures the stable operation of mechanical equipment.

The invention relates to the field for the transmission technology of mechanical engineering, specifically to a magnetic governor with remote automatic control of radial air gap, wherein the rotation and displacement of a stepper motor is accurately controlled by controlling impulse frequency, the radial displacement of a movable clamping body is controlled by means of gear transmission and thread transmission, the radial distance between a permanent magnet and a conducting bar can be adjusted accurately, different rotate speed and torque are output, and the purpose of stepless speed change of a coupler is achieved.

The invention discloses a digital edge aligner for a PFD (Phase-Frequency Detector). The digital edge aligner comprises a trigger, a phase inverter, and a pair of NOT-AND gates, which are connected with one another, wherein the trigger is formed by a basic logic door and at least comprises a pair of data input terminals, and the trigger converts one path of signals into a two-path inversion signal pair for edge aligning. The digital edge aligner can be realized through a standard digital unit, and can ensure that control impulse output to the control terminal of a charge pump by the PFD is accurately aligned.

The invention relates to an energy-saving tube, which comprises frame, base, gas discharge bubble / tube and ballast power device. Wherein, it is characterized in that: said ballast power device is one frequency-modulation impulse power circuit formed by electric elements, which comprises low-frequency vibration control impulse generating circuit (1) whose output modulates the control end of electric high-voltage switch (2); said switch (2) directly controls the main power generating circuit (3) of bubble / tube; the main power generating circuit (3) can via the modulated frequency of low-frequency vibration control impulse generating circuit (1) output intermission impulse power to the bubble / tube to send out intermission light. The invention can make gas discharge light to send out intermission impulse light at high brightness to save energy.

The invention relates to combined individual devices which combine timekeeping functions with monitoring of the radiation dosage to which the user is exposed and of radiation intensity. The aims of current invention is to use Geiger-Muller counter as a radiation detector in dividual wristwatch and to ensure its functioning over a long period of time. A voltage changer cable to change tension from 1.5V-3V to 400V is needed to make the Geiger-Muller counter function in wristwatch and other compact devices. This was realized by installing in the certain wristwatch a Geiger-Muller counter functioning as a radiation detector and a voltage pulse converter for Geigher-Muller counter functioning as a radiation detector and a voltage pulse converter for GeigherMuller counter power supply; and the micro controller was connected to the voltage changer. The problem put by is solveld also in the following way: in known method of converting low voltage into high constant voltage at opening the switch key, the return impulse voltage at primary winding is being compared with the predetermined value and frequency of switch key control impulse is being changed depending on the presence of impulse at the threshold device, here switch key control impulses come from micro controller; and when the signal from the Geiger-Muller counter is received, an additional switch key control impulse is sent.

The invention discloses continuous and impulse type trace feeder device. Upper rotating table is set above the supporting table. Truncated cone shape hopper is set above the upper rotating table. The first, border, and second scraper blades are orderly arranged along the upper rotating table. The first scraper blade is connected to surplus recovery tank. The upper and lower rotating table is connected to electric machinery. Funnel feed pipe is set between the second scraper blade and the lower rotating table. And the latter is set sector gap and the third scraper blade. It has the advantages of high stability and precision, adjustable feed rate, controlled impulse, and so on.

The invention discloses a dust collection unit of a cloth bag type dust collector, and relates to dust collection equipment in the field of environmental protection. The dust collection unit comprises a steel body, a clean air collection flue and an impulse air separation bag. The dust collection unit is characterized in that a drawer type bag chamber is formed in the steel body; an air purification chamber is formed in the upper part of the drawer type bag chamber; a dust falling device is arranged at the top of the air purification chamber; a guide wheel is mounted at the bottom of the drawer type bag chamber. The dust collection unit is simple in structure; the air purification chamber is divided into upper and lower cavity chambers, the lower air purification chamber is mainly used for controlling impulse to jet airstream and is provided with a rectification structure for guaranteeing uniform dust collection of the drawer type bag chamber, and an offline valve is arranged in the upper air purification chamber and is used for performing offline jetting; the drawer type bag chamber can be easily taken out, a filtering bag can be conveniently replaced, dust is uniformly collected, and the dust collection effect is good.

The invention discloses a turn-on muting control circuit of sound equipment. The circuit comprises an electrifying impulse generating circuit, a switching circuit, and a muting control level supplying circuit, wherein the electrifying impulse generating circuit takes electrifying of a power supply as a triggering condition, and generating a control impulse through a charging process of the circuit; the switching circuit is controlled by a control impulse to turn on or turn off a switching element in the switching circuit; the muting control level supplying circuit supplies a muting control level matched with controlled equipment; the electrifying impulse generating circuit, the switching circuit, and the muting control level supplying circuit are sequentially connected between the power supply and the controlled equipment in series; the control pulse generated when the electrifying impulse generating circuit is electrified is transmitted to the switching circuit; and the switching circuit turns on the switching element in the switching circuit in the presence of the control pulse, so the muting control level supplying circuit outputs the muting control level to the controlled equipment. The turn-on muting control circuit of the sound equipment can effectively keep the controlled equipment in a mute state when the power supply is electrified, and eliminate an abnormal sound during the starting up process.

The invention relates to a method and device for optical data transmission, in particular a method for transmission of data by means of digitised infrared signals. Data sequences are transmitted using a time-division multiplex access protocol with communication frames comprising single sequential windows with a given minimal bit transmission rate. At least one control impulse sequence is provided in each communication frame. According to the invention, the control impulse sequence is transmitted at a bit transmission rate which is lower than the minimum bit Transmission rate for the data sequence.