127results about How to "Reduce the number of switches" patented technology

A reconfigurable antenna is used in the technical field of the wireless communication. The antenna comprises three antenna radiation units, a grounding plate, a feeding port, a medium plate, five radio frequency switches, a switch controller and an ordinary connecting wire. The antenna radiation units are concentric circular sheets and circular rings which are positioned on the same side of the medium plate. The feeding port is connected with a center radiation unit of each antenna radiation unit. The five radio frequency switches are connected with the three radiation units. The ordinary connecting wire respectively connects the radio frequency switches with the switch controller, so that the connection or the disconnection of each radio frequency switch can be controlled through the switch controller, thereby changing different connection states among the three radiation units and realizing the work of the antenna in different frequency bands, namely frequency reconfiguration. The reconfigurable antenna is used for sending and receiving electromagnetic waves, and has simple structure, small volume of the whole structure, and wide reconfigured frequency band; and the control of working frequency can be realized through digital coding.

The invention belongs to the technical field of power electrons and particularly relates to a modularized multi-level full-bridge resonant power electronic transformer topology. The topology specifically comprises high-voltage side three phases which are of three-phase star connection structures, each phase is of the same structure, and each phase comprises Nt subunits and Nt low-voltage side full-bridge modules; each subunit comprises a resonance LC and a high-frequency transformer, and a high-voltage side MMC full-bridge module of each phase is shown in the description; in every two adjacent subunits, each MMC module generates a part of the base frequency phase voltage output and produces a high-frequency square wave with equal production amplitude and opposite phases at the same time, the high-frequency square wave is filtered and passes through bridge arm resonance LC, and after being separated and reduced voltage by the high-frequency transformer, the high-frequency square wave is rectified by a low-voltage side H bridge module to a low-voltage direct current bus. Compared with the high-voltage side and intermediate topology of a traditional power electronic transformer, the high-frequency transformer number, module number, capacitance number and switch number can be saved, and the topology has a good output waveform at the same time.

The present invention relates to an SVPWAM modulation method based on a three-level direct matrix converter. The method comprises the following steps: (1) determining input phase current space vectors and output phase voltage space vectors desired by a three-level direct matrix converter; (2) performing virtualization of the three-level direct matrix converter to a serial circuit model comprising a virtual rectification stage and a virtual inversion stage; (3) employing SVPWAM modulation for the virtual rectification stage to determine switching signals of each switch tube of the virtual rectification stage; (4) employing the SVPWAM modulation for the virtual inversion stage to determine switching signals of each switch tube of the virtual inversion stage; and (5) converting the switching signals of each switch tube of the virtual rectification stage and the switching signals of each switch tube of the virtual inversion stage to switching signals of each two-way switch of the three-level direct matrix converter. Compared to the prior art, the number of off and on times is maximally reduced, switching loss is reduced, the harmonic wave content of an input current is reduced, and the quality of a power grid is improved.

The embodiment of the invention relates to a digital-to-analogue conversion circuit and method, a source driver and a display device. The digital-to-analogue conversion circuit includes a first digital-to-analogue conversion device and a second digital-to-analogue conversion device, wherein the first digital-to-analogue conversion device corresponds to high-bit m digits of a (m+2)-bit digital signal, the second digital-to-analogue conversion device corresponds to low-bit n digits, and the m and the n are both integers greater than zero. The first digital-to-analogue conversion device includes a voltage division module, a first voltage selecting module and an operation module, wherein the voltage division module is used for generating 2<m> reference voltages which have an equal gap voltage, the first voltage selecting module is used for selecting first voltages corresponding to the m digits from the 2<m> reference voltages, the operation module is used for generating second voltages from two adjacent reference voltages in the 2<m> reference voltages and the first voltages, and the gap voltage of the second voltages is greater than that of the first voltages. The second digital-to-analogue conversion device is used for using the first voltages and the second voltages as reference voltages, generating third voltages corresponding to the n digits and generating the sums of the third voltages and the first voltages.

The invention discloses a multi-phase motor winding switching circuit, which belongs to the field of motor control and solves the problem that the energy utilization rate of an existing switching device is low. m head ends of each winding unit of an m-phase motor are connected to m output bus wires of an inverter, each tail end of each winding unit is correspondingly connected with a collector electrode of a switching tube of one switching circuit unit of n winding switching circuit units, emitting electrodes of switching tubes of m switching units of each switching circuit unit are correspondingly connected with a cathode of one diode of one clamping circuit unit after being connected together, an anode of the diode is connected with a power supply direct-current bus wire cathode which drives the inverter of the m-phase motor together, anodes of other m diodes of each clamping circuit unit are correspondingly connected with collector electrodes of the switching tubes of the m switching units of the switching circuit unit together, m diodes are in common cathodes, and anodes of power supply direct-current bus wires are simultaneously connected together. The multi-phase machine winding switching circuit disclosed by the invention is suitable for a motor drive system.

The invention relates to a method for rapidly uninstalling multiple application programs. The method comprises the following steps: obtaining a first operation signal through a touch screen; moving a target application program icon to be superposed with another target application program icon on the touch screen through a processing unit according to the first operation signal, so as to create a destination folder; obtaining a second operation signal through the touch screen so as to move the other target application program icons to the destination folder through the processing unit; after moving the target application program icons to the destination folder, obtaining a third operation signal through the touch screen so as to move the destination folder to a recycle bin shortcut key; and uninstalling application programs corresponding to the target application program icons in the destination folder through the processing unit.

The invention relates to the field of display, and provides a shift register. The shift register comprises a first input module, a second input module, a pull-up module, an output module, a first capacitor, a second capacitor and a third capacitor, wherein the first input module is electrically connected with a signal input end and a first signal end, and transmits a signal input by the first signal end to a third node by control of the signal input end; the second input module is electrically connected with the signal input end, the first signal end, a second signal end and a first clock signal end, and transmits a signal input by the signal input end to a first node; the pull-up module is electrically connected with the first clock signal end, the second signal end and a second clock signal end, and transmits a signal input by the second signal end to a second node; the output module is electrically connected with the first signal end, the second clock signal input end and an output end, and transmits the signal input by the first signal end or a signal input by the second clock signal end to the output end.

The invention provides an MMC sub-module with the direct-current short-circuit fault self-removing function. The MMC sub-module is composed of a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube, a diode, a first capacitor and a second capacitor, wherein the switching tubes are IGBTs. The working process of the MMC sub-module is equivalent to the working process of two half-bridge modules, loss is low, the direct-current side fault self-removing capacity of a direct-current transmission system is achieved, and the number of devices forming the MMC sub-module is small. Compared with an existing half-bridge sub-module, the MMC sub-module has the direct-current side fault self-removing capacity of the direct-current transmission system; compared with an existing full-bridge sub-module, the number of the switching tubes is reduced; compared with an existing two-clamping-position sub-module, one diode is omitted, the number of the switching tubes which are powered on in the working process is reduced, and loss is low.

The invention relates to a movable electric vehicle charger to detect a simulated load, which is used for tests that require variable resistance in the safety performance test and output characteristic test of the electric vehicle charger. The simulated load is 500% R _N , 375%R _N , 250%R _N , 200%R _N , 150%R _N , 100% R _N , 75%R _N and 50% R _N Eight resistance value resistors are connected in parallel, among which, R _N =U _N /I _N , is the rated voltage U output by the charger _N and rated current I _N By turning on or off the corresponding switch, the output terminal of the charger is connected to detect the required resistance value. The simulated load of the present invention can not only meet the requirements of the resistance value required by the detection test, but also has the characteristics of a movable type with a small volume.

A method for determining a switch network comprises the steps: (1) splitting the switch network into (M-N) small rings according to the number N of master single machines and the number (M-N) of backup single machines, wherein, the switch network is connected with the master ringlet machines and the backup single machines; M is greater than N; (M-N) is less than or identical to 4; and each small ring only comprises a backup single machine; (2) for each small ring, using a master switch with four ports and a relay switch to connect the master single machines with the backup single machines forforming a small ring structure, wherein the switch connection modes are performed respectively according to odd number or even number of the master single machines contained in the small ring; and (3) constituting various small rings into a big ring, so as to obtain a final switch network. By the method, under a condition that the numbers of the master and backup single machines are determined, adesign scheme of the switch network can be determined fast by three steps of splitting a big network into small networks, determining the connecting relation of the small networks and constituting the small networks into a big network; and the determined switch network satisfies the completeness, minimality, first backup compatibility and first backup shortest performance of a redundant network.

The invention provides a switched capacitor common mode feedback structure, and belongs to the technical field of analog integrated circuits. The switched capacitor common mode feedback structure is applicable to a fully differential operational amplifier, and comprises an output level scaling switched capacitor module and a common mode level detection and amplification module, two input ends of the output level scaling switched capacitor module are connected with two output ends of the fully differential operational amplifier for scaling an output voltage of the fully differential operationalamplifier, so that the scaled voltage satisfies the input range of the common mode level detection and amplification module, an output end of the output level scaling switched capacitor module is connected with the input end of the common mode level detection and amplification module, the common mode level detection and amplification module detects the scaled voltage, and the output end of the common mode level detection and amplification module outputs a common mode feedback current source bias voltage to feed back a current source bias point of the fully differential operational amplifier,so that the output common mode level of the fully differential operational amplifier is stabilized at an ideal common mode level. The switched capacitor common mode feedback structure provided by theinvention not only has the advantages of higher speed and higher precision of the common mode feedback structure within a continuous time, but also has the advantages of large output amplitude and good linearity of the switched capacitor common mode feedback structure.

The invention belongs to the technical field of bridge construction and particularly relates to a continuous beam cantilever casting secondary real-time counterweight system and a construction method. The device solves a problem that the manual uncertainty risk is large due to the fact that the unbalance deviation is kept within an allowable range through a method of manually commanding and controlling the concrete pouring variance in traditional continuous beam concrete pouring, and comprises a central water tank arranged in the center of a 0 # section, poured sections are arranged on the two sides of the 0 # section, and hanging baskets are installed on the poured sections; a hanging basket refitting part capable of moving forwards along with the hanging basket is installed on the hanging basket, to-be-poured section water tanks are installed on the left side and the right side of the hanging basket refitting part correspondingly, and the central water tank supplies water to the to-be-poured section water tanks; an adjustable laser emitting device II and an adjustable laser emitting device I are installed at the end, close to the to-be-poured section, of the poured section, a double-sided photosensitive induction device is arranged in the center of the 0 # section, and pressure sensors are arranged between the bottoms of the hanging basket longitudinal beams on the two sides and the poured beam section.

The invention discloses a hybrid MEMS phase shifter, so as to solve problems of large phase shifter chip area, poor phase shift precision and low process tolerance in the prior art. The hybrid MEMS phase shifter comprises a base, a microstrip transmission line grounding line arranged at the bottom part of the base, a phase delay network, a phase reference network, and power distributors for being connected with the phase delay network and the phase reference network, wherein the power distributors are connected with the phase delay network and the phase reference network via single-pole single-throw switches or single-pole double-throw switches; each of the phase delay network and the phase reference network is composed of one or more MEMS variable capacitors and two connection transmission lines connected with two sides of the MEMS variable capacitors respectively and connected with parallel-type MEMS switches, and the single-pole single-throw switches or single-pole double-throw switches are the parallel-type MEMS switches. The switched-line phase shifter and the distributed phase delay network structure are combined, and advantages that the reference network and the delay network have high isolation, and phase shift is simulated and adjustable in a small range.

The invention discloses an active clamping, boosting and isolating series miniature converter control method and a device. The device comprises an acquisition circuit used to acquire an input direct voltage and current signal and an output direct voltage signal, a controller used to track the maximum power of the input direct voltage and current signal and form a switching drive signal, a drive circuit used to control on-off of a main switch and an auxiliary switch of an active clamping and boosting circuit according to the switching drive signal, the active clamping and boosting circuit used to actively clamp and boost the high side of the input direct voltage signal, and an isolation circuit used to isolate the direct voltage signal after high-side active clamping and boosting and output a boosted high-frequency direct voltage. By adopting the active clamping, boosting and isolating series miniature converter control method and the device of the invention, on the premise of ensuring the safety performance of voltage conversion, the number of the switches is reduced, the stress of the switches is lowered, the size of the device is reduced, and the cost is lowered.

The invention discloses a lamp control system using alternating current chopping transmission data, and particularly relates to the technical field of lamp control equipment. The system comprises an alternating current chopping data sending module and an alternating current chopping data receiving module. The connection end of the alternating current chopping data receiving module is connected with a lamp driver module. According to the invention, the system is provided with the alternating current chopping data sending module and the alternating current chopping data receiving module; the alternating current chopping data sending module receives external control data, converts the data and sends the data to the alternating current chopping data receiving module via an alternating currentwire; after analysis of the alternating current chopping data receiving module, the brightness, color temperature and the like of a street lamp or other lamps are finally controlled by the lamp drivermodule; the alternating current wire is used to transmit the data to realize various functions such as brightness adjustment, color temperature adjustment and color control; and without additional signal transmission lines or other wireless transmission modules, single-point intelligent control of multiple lamps connected with the single loop alternating current wire is realized.