34results about How to "Achieve power output" patented technology

The invention provides a single-phase two-tube five-level rectifier based on a hybrid H bridge. The rectifier comprises a switching tube Q1 and a switching tube Q2, one side of an alternating currentpower supply Vs is connected with the anode of a diode D1 and the cathode of a diode D2, and the connection node forms an end point b; the connection nodes of the other end of an inductor L and diodesD3, D4, D5 and D6 form end points a; the connection nodes of the drain electrode of the switching tube Q1 and the diodes D1, D3 and D7 form end points c; the connection nodes of the source electrodeof the switching tube Q1 and the diodes D2, D4 and D8 form end points d; the anode of the diode D8 is connected with the negative electrode of a capacitor C2 to form an end point m; the anode of the diode D11, the cathode of the diode D12 and the positive electrode of the capacitor C2 are connected with the negative electrode of a capacitor C1 to form an end point n; the cathode of the diode D7 isconnected with the positive electrode of the capacitor C1 to form an end point p. The end point a, the end point c, the end point d and the end point n form four ports of the hybrid H bridge. The rectifier has the advantages of being high in output direct-current voltage, small in harmonic content, low in switching tube stress, easy to control and the like.

The invention discloses a front surface grid-line-free P type crystal silicon back contact two-sided battery structure and a manufacturing method therefor. A transparent conductive film is positioned on a front surface passivation film and an antireflection film; via hole electrodes used for connecting front surface and back surface negative electrodes of the battery are arranged in through holes in a P type crystal silicon wafer; partial heavily-doped N+ regions distributed based on regular patterns are arranged on the surface layer of an N type layer; the transparent conductive film passes through the antireflection film and the front surface passivation film to be in electrical contact with the partial heavily-doped N+ regions and the top ends of the via hole electrodes to form a battery negative electrode; the transparent conductive film is used for guiding electrons collected on the front surface of the battery to the back surface of the battery through the via hole electrodes; and back surface positive electrode thin grid lines pass through a first back surface passivation film and a second back surface passivation film to form partial ohmic contact with a P type substrate and to be connected with back surface positive electrode main grid lines together to form a battery positive electrode. By virtue of the battery structure and the manufacturing method therefor, light shielding of the battery positive electrode is avoided, power output is increased, consumption amount of silver paste in the battery manufacturing process is reduced, and production cost is lowered.

A single-phase three-level rectifier with hybrid T-shaped bridges comprises two groups of T-shaped bridges and two split capacitors C1 and C2. Three bridge arms of the two groups of T-shaped bridges are respectively composed of two diodes and a group of bidirectional power tubes; the first T-shaped bridge comprises diodes D1, D2, D5, D6, D7 and D8 and a power switch tube S1, wherein the diodes D5, D6, D7 and D8 and the power switch tube S1 form a group of bidirectional power tubes. The second T-shaped bridge comprises diodes D3 and D4 and power switch tubes S2 and S3, wherein the power switch tubes S2 and S3 form a group of bidirectional power tubes. According to the single-phase three-level rectifier with the hybrid T-shaped bridges, the harmonic content in a power grid is reduced, and the power factor of equipment is greatly improved.

A double-switch three-level rectifier with symmetrical T-shaped bridges comprises two groups of symmetrical T-shaped bridges and two split capacitors C1 and C2. Three bridge arms of the two groups of T-shaped bridges are respectively composed of two diodes and a group of bidirectional power tubes; the first T-shaped bridge comprises diodes D1, D2, D5, D6, D7 and D8 and a power switch tube S1, wherein the diodes D5, D6, D7 and D8 and the power switch tube S1 form a group of bidirectional power tubes. The second T-shaped bridge comprises diodes D3, D4, D9, D10, D11 and D12 and a power switch tube S2, wherein the diodes D9, D10, D11 and D12 and the power switch tube S2 form a group of bidirectional power tubes. The two groups of symmetrical T-shaped bridge structures are favorable for solving the heat dissipation problem and the modular design of the system. According to the invention, the three-level function is realized by adopting different combination modes of the power switch tubes, and even if a bidirectional tube is in a fault state, the double-switch three-level rectifier with the symmetrical T-shaped bridges can still realize power output to a direct current side.

The invention discloses a power control method for a laser repeated combination track, which comprises the following steps of: determining a datum line along a center line of a welding seam, and configuring corresponding graph sizes according to different shapes of the welding seam to cover the width of the welding seam; configuring a corresponding power curve according to the length of a single graph; the laser spot moves along the track of the pattern, and meanwhile, the whole pattern moves along the advancing direction of the datum line with the pattern center to form a motion track of a composite curve path; copying the power curve corresponding to a single graph into other repeated graphs to form a continuous power curve on the composite curve; enabling the power curve of each pattern cycle period to be independent of a control unit; a single control unit is used as a reference unit for power modification of a laser repeated combination track, a continuous composite curve is subjected to power curve copying and expanding, power control over a complex composite curve is carried out, and therefore power output of the complex composite curve is achieved, and the power output is more uniform and accurate.

The embodiment of the invention discloses a virtual synchronous power generation method and system based on an inverter, and the method comprises the steps: detecting a current at a grid connected point; carrying out the regulation and control of the current according to a preset control link, and generating an end voltage of a virtual synchronous power generator; generating a drive signal according to the end voltage of the virtual synchronous power generator, and controlling the on/off of a switching device in the inverter. According to the embodiment of the invention, the method achieves the closed-loop control of a system, can achieve the stable power output, and maintains the synchronization with a microgrid, and facilitates the improvement of the stability of a power grid.

According to a heterogeneous diode clamping type three-level rectifier, one side of an alternating current power supply ug is connected with parallel inductors L1 and L2, and the inductor L1 is connected with the drain electrode of a switching tube S1 and the anode of D1 to form a node a; the inductor L2 is connected with the cathode of the diode D2 and the source electrode of the S2 to form a node b; the other side of the alternating current power supply ug is connected with a source electrode of a switching tube S3 and a drain electrode of a switching tube S4 to form a node N; the cathode of the diode D1, the cathode of the diode D3, the drain electrode of the switching tube S2 and the anode of the capacitor C1 are connected to a node p; the anode of the diode D2, the anode of the D4, the source electrode of the switching tube S1 and the cathode of the capacitor C2 are connected to a node m; and the anode of the diode D5, the cathode of the diode D6 and the split capacitors C1 and C2 are connected to a node n. According to the heterogeneous diode clamping type three-level rectifier, switching loss of a switching tube can be reduced, harmonic waves and voltage stress of the switching tube are reduced, and the rectifier has high reliability.

The invention discloses a water flow speed measurement radar which is characterized by comprising an antenna, a time delay reconstruction radio frequency TR radio frequency module and a radio frequency sampling signal processing module. The time delay reconstruction radio frequency TR radio frequency module comprises a radio frequency signal receiving channel, a radio frequency signal transmitting channel and a change-over switch. One of the radio frequency signal receiving channel and the radio frequency signal transmitting channel is selected to be connected with the antenna through the change-over switch; the radio frequency signal receiving channel comprises a first low-noise amplifier and a programmable delay line, and amplification of received signals and program control configuration of fixed deviation time delay are achieved through the first low-noise amplifier and the programmable delay line. The radar has the characteristics of high water flow velocity measurement resolution, high sampling point density, large detection dynamic range, full intelligence, wide applicability and the like.

The invention discloses a compressed air energy storage system based on a linear electric generator and a control method thereof. The system comprises a high-pressure air storage chamber, a liquid piston, a hydraulic piston, the linear electric generator and a hydraulic control mechanism; the top of the high-pressure air storage chamber is connected with the top of the liquid piston through a pipeline; the bottom of the liquid piston is connected with the hydraulic piston through a pipeline; the hydraulic control mechanism is connected with the hydraulic piston to control a piston rod to conduct reciprocating movement; and the piston rod is connected with the linear electric generator to achieve power generation. The invention discloses the control method of the system at the same time. Astroke controller is combined with a valve switch to control the stroke of the piston, so that the power of an input power grid of the whole compressed air energy storage system is adjusted; when theload is constant, the average power output by unit time does not change along with change of the gas pressure intensity; and the linear electric generator is adopted, constant voltage when the systemsupplies power is ensured through voltage loop and current loop control, and the power supply reliability is improved.

A single-phase three-level power factor correction circuit with asymmetric novel T-shaped bridges comprises an uncontrolled rectifier bridge, two groups of bidirectional power tubes and capacitors C1 and C2. A first rectifier bridge arm of the uncontrolled rectifier bridge and one group of bidirectional power tubes form a first T-shaped bridge, and a second rectifier bridge arm of the uncontrolled rectifier bridge and the other group of bidirectional power tubes form a second T-shaped bridge; the first T-shaped bridge comprises a first group of bridge arms and a group of bidirectional power tubes; the first group of bridge arms comprises diodes D1 and D2, and the group of bidirectional power tubes comprises diodes D5, D6, D7 and D8 and a switch tube S1; the second T-shaped bridge comprises a second group of bridge arms and another group of bidirectional power tubes; and the second group of bridge arms comprises diodes D3 and D4, and the other group of bidirectional power tubes comprises diodes D9 and D10 and switch tubes S2 and S3. According to the circuit, boost output can be achieved, and the requirement for the voltage level of post-stage equipment is met. And meanwhile, the circuit also has the advantages of relatively high DC voltage output, relatively low harmonic content, relatively low switching stress, relatively simple control and the like.

The invention discloses a polarization separation composite cavity holmium laser, belongs to the technical field of solid laser, and can solve the problems that the output pulse width of an existing Tm/Ho bonding laser is large, and narrow pulse width output cannot be achieved. The holmium laser comprises a pumping source, a coupling lens group, a first cavity mirror, a bonding crystal, a polarizing film, an electro-optic Q-switched crystal and an output coupling mirror, the coupling lens group is used for coupling the pumping laser into the bonding crystal; the bonding crystal is a Tm and Ho doped YLF crystal, and the bonding crystal is used for generating Tm laser and Ho laser under the excitation of the pumping laser; the polaroid is used for reflecting the sigma polarization Tm laser and transmitting the pi polarization Ho laser; the holmium laser further comprises a second cavity mirror, and the second cavity mirror is arranged on the reflection light path of the polaroid. The first cavity mirror is used for transmitting the pumping laser and reflecting the Tm laser; the second cavity mirror is used for reflecting the Tm laser; and the output coupling mirror is used for transmitting the Ho laser with a preset proportion and reflecting the rest of the Ho laser. The invention is used for the holmium laser.

The invention discloses a high-performance hydrogel-nanofiber-based wearable friction generator. The high-performance hydrogel-nanofiber-based wearable friction generator comprises a hydrogel-nanofiber composite film layer, a packaging part and an electrode, the hydrogel-nanofiber composite film layer is composed of a conductive hydrogel layer and a nanofiber layer formed on the conductive hydrogel layer; the nanofiber layer is in a wrinkle shape in a natural state; the packaging part is internally provided with a cavity, the hydrogel-nanofiber composite film layer is arranged in the cavity of the packaging part, and a gap exists between a nanofiber layer on the hydrogel-nanofiber composite film layer and the packaging part; air holes are formed in the side surface of the packaging part; one end of the electrode is connected with the hydrogel-nanofiber composite film layer, and the other end of the electrode penetrates through the packaging part to be connected with an external circuit.

The invention provides a bidirectional isolation digital converter which comprises a primary side digital controller, a secondary side digital controller, an isolation circuit, an isolation transformer, an input voltage sampling circuit, an output voltage sampling circuit, a bidirectional current sampling circuit, an input power driving circuit, an output power driving circuit, a primary side driving circuit and a secondary side driving circuit. According to the embodiment of the invention, the primary side digital controller and the secondary side digital controller are adopted, and the isolation circuit and the isolation transformer are arranged between the primary side digital controller and the secondary side digital controller so that power output from input to output can be realized,and power output from output to input can also be realized; in addition, by arranging the isolation device, the converter can be applied to high-power occasions or occasions where sparks are prone tobeing generated, and the requirements of users are met.

The invention provides a three-dimensional integrated system and a preparation method thereof. The integrated system comprises a nano generator, a nano capacitor structure, a first silicon through hole structure and a second silicon through hole structure. The method comprises the following steps: selecting an etching substrate, etching a plurality of silicon nano holes in the surface of the etching substrate, and preparing to obtain the nano capacitor structure; preparing the nano generator with a common electrode on the surface of the nano capacitor structure; processing the two sides of thetop of the nano generator to obtain the first silicon through hole structure and the second silicon through hole structure; and carrying out metal wiring in the first silicon through hole structure and the second silicon through hole structure to achieve conduction connection between the nano capacitor structure and the nano generator in order to obtain the final integrated system. Electric energy generated by the piezoelectric generator is stored in the nano capacitor structure to obtain continuous and stable energy output. The whole system is easy to miniaturize and occupies a small area.

A power generation system includes: an internal feedback generator including a rotor winding disposed on a rotor and a main winding and a feedback winding disposed on a stator, the main winding beingelectrically connected to a power grid; and a double-fed converter connected between the rotor winding and the feedback winding and used for controlling the active power and the reactive power outputby the main winding. According to the system, the main winding of the stator is directly connected with a high-voltage power grid, so that a conventional boosting grid-connected transformer is omitted, and the feedback winding of the generator and the rotor winding adopt a low-voltage working voltage, so that a low-voltage converter which is mature in technology and relatively low in cost is conveniently adopted.

The invention discloses a motor differential confluence power uninterrupted gear shifting system. According to the system, an engine output shaft is connected with a main clutch, then penetrates through a gearbox input shaft and is connected with a gear shifting clutch driving disc; a gear ring clutch driven disc connecting shaft is connected with a gear shifting clutch driven disc, a gear shifting brake rotating disc and a planet row gear ring at the same time; a sun gear shaft penetrates through a planet carrier supporting shaft and is connected with a sun gear and a Z4 driven gear at the same time; a planet carrier output Z1 driving gear is connected with the planet carrier supporting shaft; a planet carrier output Z2 driven gear is connected with a gearbox output shaft; a gear shifting motor Z3 driving gear is connected with a gear shifting motor output shaft; a power output shaft penetrates through the sun gear shaft and the gear ring clutch driven disc connecting shaft and then is connected with the engine output shaft; the engine output shaft, the gearbox input shaft, the gear ring clutch driven disc connecting shaft, the planet carrier supporting shaft and the power output shaft are of a concentric structure. Therefore, multiple functions of uninterrupted power gear shifting and the like can be realized.