98results about How to "Stable voltage output" patented technology

The invention discloses a flexible tactile sensor array and an array scanning system applied to the same. The sensor array comprises a projection layer, an upper electrode layer, a middle layer and alower electrode layer, wherein the projection layer is provided with a plurality of projections arranged in an array; the upper electrode layer is provided with a plurality of electrodes and is connected with the projection layer; the middle layer is provided with a plurality of piezoresistive units and is connected with the upper electrode layer; each piezoresistive unit corresponds to each edgeof each projection one to one; the lower electrode layer is provided with a plurality of electrodes and is connected with the middle layer; and each electrode of the upper electrode layer and each electrode of the lower electrode layer are correspondingly interconnected with each piezoresistive unit of the middle layer. The flexible tactile sensor array disclosed by the invention is simple and reliable in production process and low in cost, meanwhile, overcomes the defect of poor flexibility of a conventional silicon-based tactile sensor, has higher sensitivity, is short in response time and can implement real-time detection and feedback on a contact force.

The present invention discloses a high power LED lamp circuit with a fan provides advantages such as simple structure, high efficiency, low power consumption, energy saving, and longer lifetime. The LED lamp circuit comprises a rectifying-filtering circuit (1), an LED load (3), an output terminal (A) and a grounding terminal (G) for providing a DC power generated by passing an AC power through the rectifying-filtering circuit (1), the high power LED lamp circuit with a fan further comprises a constant current source (4), a fan driving circuit (6); the lamp circuit is formed by cascading the LED load (3), the constant current source (4) between the output terminal (A) and the grounding terminal (G), the LED lamp circuit is widely applicable in various kinds of LED lamps.

A low dropout voltage regulator. The regulator comprises a bandgap reference circuit and first and second transistors coupled in parallel. The parallel transistors form the input of an operational amplifier, coupled to and providing substantially no load to the bandgap reference circuit. The bandgap reference circuit is coupled to the output of the integrated circuit low dropout voltage regulator. As a beneficial result, the bandgap reference works from a regulated output and has substantially no load. Consequently, the voltage output of the present invention is highly stable.

The invention discloses a wideband piezoelectric type vibration energy collection device with a movable mass ring. The wideband piezoelectric type vibration energy collection device comprises an elastic beam, a piezoelectric element, a sliding track, limiting stop blocks and the movable mass ring, wherein the elastic beam is suspended with the two end surfaces fixed, the piezoelectric element is closely attached to the surface of the elastic beam and is adjacent to one fixed end of the elastic beam, the sliding track is located in the middle of the elastic beam, the limiting stop blocks are located at the two ends of the sliding track and fixed to the elastic beam, and the sliding track and the elastic beam penetrate through the movable mass ring which is freely suspended on the sliding track. According to the device, the frequency bandwidth of vibration energy collection is increased through the movement behaviors such as sliding and rotation performed by the movable mass ring under the outside vibration effect, and therefore wideband work of the piezoelectric type vibration energy collection device is achieved.

The invention discloses a drive circuit of a laser source of a laser projector, which comprises an input interface, a first drive generation circuit, a second drive generation circuit and an output interface, wherein the first drive generation circuit and the second drive generation circuit are two parallel drive generation circuits and are symmetrically distributed between the input interface and the output interface; and the two parallel drive generation circuits are integrated together and connected with an external power supply system through the input interface, and output a transformed voltage through the output interface. The invention satisfies the electric demands for the laser source of the laser projector, greatly reduces the volume of the drive circuit board, implements control on the power of the laser device, and has the function of current control for accurately controlling the emergent light ratio.

The invention discloses an adjustable constant flow source driving circuit for an LED (light-emitting diode). The driving circuit comprises an operation amplifier, a transistor and a single chip system, wherein the positive phase input end of the operation amplifier is connected with a reference voltage circuit, the grid electrode of the transistor is coupled with the output end of the operation amplifier through a resistor R4, the LED is connected between the drain electrode of the transistor and the reference voltage circuit, the single chip system is connected with the positive phase input end of the operation amplifier, the source electrode of the transistor is connected with the negative phase input end of the operation amplifier to form a current-series negative feed-back system, a grounded voltage sampling resistor R6 is connected between the source electrode of the transistor and the negative phase input end of the operation amplifier, nodes A are formed between the source electrode of the transistor and a voltage sampling resistor R6, the single chip system is used for adjusting the control voltage of the positive phase input end of the operation amplifier according to the voltage signals acquired from the nodes A, and a grounded divider resistor R5 is connected between the resistor R4 and the grid electrode of the transistor. The driving circuit is controlled by the single chip system, thus current change can be steadily and continuously controlled when the voltage on the positive phase input end of the operation amplifier is adjusted.

The invention discloses an elevator intelligent brake control method and device. The control method includes: a brake control system which outputs voltage to a brake coil to allow a brake shoe to be separated form a brake wheel is started, and target floor information is input to the brake control system to allow an elevator car to operate; when the distance between the elevator car and the target floor reaches the preset distance, the brake control system slowly reduces voltage output, magnetic force generated by the brake coil reduces gradually, and a compression spring on the brake arm gradually reduces the distance between the brake shoe and the brake wheel; when the elevator car reaches the target floor, voltage output by the brake control system is cut off, the brake shoe tightly holds the brake wheel, and the elevator car stops operating. By the method, brake time during elevator stopping is reduced, and safety hazards such as sliding when the elevator control system fails. Due to the fact that the distance between the brake shoe and the brake wheel is reduced, noise caused by collision of the brake shoe and the brake wheel is reduced. The invention further provides an elevator intelligent brake control device.

The invention provides a driving control system of an electric vehicle. The driving control system comprises a heating circuit (11) and a load capacitor C12, wherein the heating circuit (11) is used for being connected with a vehicle-mounted battery (5) to form a heating loop; and the driving control system further comprises a current storage element L11, wherein the current storage element L11 and the load capacitor C12 are connected in series and are then connected with the heating circuit (11) in parallel. According to the driving control system of the electric vehicle provided by the invention, the heating circuit (11) and the load capacitor C12 can work simultaneously without affecting each other.

Illuminator of using kinetic energy includes piezoelectric generating transducer and luminous element light emitting diode connected to each other. The piezoelectric generating transducer uses PZT piezoelectric ceramic as transduction material. The illuminator of using kinetic energy further includes transforming storage connected to piezoelectric generating transducer as well as flashing light sequence control part, which is connected to luminous element, for controlling time sequence of luminescence. The disclosed illuminator of using kinetic energy uses parasitical energy to glow, possessing features of lightweight, small size, low cost, relative high output electric quantity, and convenient transmission of electric energy.

A resonant circuit has two parallel resonant branches and one assistant inductor connecting the two resonant branches. Each resonant branch has a series capacitor and a series inductor connected in series. The other end of the series inductor is for connecting to a primary side of a transformer unit. The resonant circuit can provide two characteristic resonant frequencies fr and fm, so that a resonant power converter using the resonant circuit has an operating frequency fs that satisfies fs>fr or fm<fs<fr. The combination of the two resonant branches and the assistant inductor can reduce the frequency switch range of the resonant power converter within a specific voltage gain.

The invention relates to a voltage transforming rectifier with dual functions of voltage stabilization and harmonic injection, belonging to the field of power electronic equipment. The voltage transforming rectifier comprises a phase shifting transformer 1, a three-phase bridge rectifier circuit 2, a three-phase bridge rectifier circuit 3, a paralleling reactor 4, a switch inverter circuit 5, a single-phase rectifier bridge 6, a high-frequency transformer 7, a controller and an inductor. The voltage transforming rectifier is characterized in that a triangular wave current is injected to the paralleling reactor through the action of the switch inverter circuit and the high-frequency transformer, so that the current waveform at the input end of the phase shifting transformer is closer to sine to improve the power factor of the entire equipment and ensure the cleanness of the public grid is ensured. The voltage stabilizing circuit comprises the switch inverter circuit, the single-phase rectifier bridge and the high-frequency transformer, so that the voltage transforming rectifier has stable output voltage under different loads to improve the loading capacity of the system. Compared with the voltage transforming rectifier with independent voltage stabilization and harmonic injection, the voltage transforming rectifier provided by the invention reduces the quantity of elements, lowers system complexity, has the advantages of low input current harmonics, stable output voltage, high precision, etc. and is applicable to medium and high power rectification occasions in the aviation industry and national production.

The invention relates to an intelligent unmanned aerial vehicle for firefighting based on the Internet of Things. The intelligent unmanned aerial vehicle comprises a main body, a supporting mechanism arranged under the main body, a firefighting mechanism arranged on the main body and two flight units, wherein the two flight units are respectively arranged on two sides of the main body; and a camera and a dust removing mechanism are arranged on the main body. According to the intelligent unmanned aerial vehicle for firefighting based on the Internet of Things disclosed by the invention, a cleaning block moves back and forth to remove mist and ash on the camera through the dust removing mechanism, so that the image shooting capacity of the camera is restored, and a fire scene figure is convenient to acquire for performing the operations of firefighting and fire extinguishing; moreover, firefighting spray nozzles are driven by the firefighting mechanism to generation angle rotation, so that the firefighting spray nozzles can aim at a fire source for fire extinguishing; little time is consumed when the firefighting spray nozzles rotate, so that the firefighting efficiency is improved, and the practicality of the equipment is improved; and in a voltage stabilizing circuit, the stable voltage output of an output end is guaranteed, and the type of a second integrated circuit U2 is LT3086, so that the stability of the output voltage is good, the voltage difference is low and the working noise is low.

A resonant circuit has two parallel resonant branches and one assistant inductor connecting the two resonant branches. Each resonant branch has a series capacitor and a series inductor connected in series. The other end of the series inductor is for connecting to a primary side of a transformer unit. The resonant circuit can provide two characteristic resonant frequencies fr and fm, so that a resonant power converter using the resonant circuit has an operating frequency fs that satisfies fs>fr or fm<fs<fr. The combination of the two resonant branches and the assistant inductor can reduce the frequency switch range of the resonant power converter within a specific voltage gain.

The invention discloses a local shadow photovoltaic array MPPT control method based on an optimization algorithm of the molecular kinetic theory. Output current of a photovoltaic array serves as particles of the algorithm, the power of the photovoltaic array serves as an algorithm fitness function, and through the novel and rapid overall search technology, namely the optimization algorithm of the molecular kinetic theory, the maximum power point of the overall photovoltaic array is efficiently and accurately found out, the voltage of the maximum power point is output through the algorithm, the difference value between the voltage of the maximum power point and the actual output voltage of the photovoltaic array is obtained, a Boost circuit is controlled through a PWM module, and tracking of the maximum power point is achieved. The problem that under the local shadow condition, the photovoltaic array MPPT control having multi-peak output characteristics is easy to fall into interference of local maximum power points, the overall maximum power point can be accurately found out, tracking speed is high, and steady-state oscillation is small.

The present invention provides a graphene thin film electrode. The graphene thin film electrode comprises an electrode substrate, a graphene thin film composited on the electrode substrate, and a metal thin film composited on the graphene thin film; the graphene thin film is a single-layer graphene sheet or a multi-layer graphene sheet; and single-layer graphene sheets are stacked so as to form the multi-layer graphene sheet. The invention also provides a preparation method of the graphene thin film electrode. According to the graphene thin film electrode and the preparation method thereof ofthe invention, the single-layer graphene sheets are stacked so as to form the multi-layer graphene sheet, so that the multi-layer graphene sheet can be used for preparing the graphene thin film electrode. A flexible graphene conductive electrode can be also prepared; the integrity of a two-dimensional planar structure can be reserved, and the conductivity of graphene can be retained; and the flexible graphene conductive electrode can be directly used for the extremely thin electrode material of a flexible or non-flexible supercapacitor. The interdigital patterning of the electrode is realizedby means of laser carving, so that a light and ultra-thin all-solid supercapacitor can be prepared; the energy density and power density of the device can be improved; and excellent alternating-current filtering performance of the device can be realized.

The invention relates to a preparation method of an air battery cathode catalyst, wherein the cathode catalyst is a mixture of Alpha-MnO2 and Beta-MnO2, and the reaction materials are bivalent manganous salt, heptavalent manganous salt and water; the bivalent manganous salt is one of manganese chloride, manganese sulfate, manganous nitrate, and manganese acetate; the heptavalent manganous salt is potassium permanganate which has a substantially strong catalytic activity. A substantially high open-circuit voltage is provided after the battery is assembled, with the voltage output being stable and the capacity being high.

The invention relates to a positive and negative symmetrical output power source which comprises a first fixing feedback unit, a second fixing feedback unit and a second dynamic feedback unit. The first fixing feedback unit conducts sampling on the voltage value of the first voltage output end and feeds the voltage value back to the first feedback adjusting end. The second fixing feedback unit conducts sampling on the voltage value of the second voltage output end and feeds the voltage value back to the second feedback adjusting end. The second dynamic feedback unit feeds the difference value back to the second feedback adjusting end by obtaining the difference value of the superposed voltage value of the first voltage output end and the second voltage output end and the ground potential so that the voltage value of the first voltage output end and the voltage value of the second voltage output end can be made to be symmetrical. The invention further relates to a medical device. The positive and negative symmetrical output power source and the medical device have the following advantages that the symmetry of the output voltage can be adjusted automatically and precisely.

The invention relates to a linear high voltage direct current stabilized power supply with an IGBT as a pass transistor. The power supply is composed of a high voltage boosting transformer, a high voltage rectification filter circuit, a series-connection IGBT voltage regulating circuit, an automatic current limiting circuit, an output voltage filter circuit, a potential holding circuit, an output voltage feedback circuit, an operational amplifier comparator circuit, a zero setting circuit and a set signal linear isolating circuit, wherein the high voltage boosting transformer, the high voltage rectification filter circuit, the series-connection IGBT voltage regulating circuit, the automatic current limiting circuit, the output voltage filter circuit and the potential holding circuit are sequentially connected to form a main circuit, and the output voltage feedback circuit, the operational amplifier comparator circuit, the zero setting circuit and the set signal linear isolating circuit form a control circuit. The linear high voltage direct current stabilized power supply is used for high voltage IGBT device VCES tests, working voltage can reach 10 kV, voltage output can be linearly set and controlled through a computer, voltage output is stable and free of high frequency noise, and direct current square waves with the adjustable width can be obtained through control as needed.

The invention discloses a power generating control system and a control method of a permanent magnet brushless direct current starting motor / generator. The control system controls the permanent magnet brushless direct current motor driven by foreign force to generate electricity for load, and comprises a three-phase rectifier bridge, an output voltage detection circuit, an output current detection circuit, a digital signal processor (DSP) controller and a hall sensor. The control method provides a control process for the DSP controller. Original hardware conditions can be directly utilized, and a hardware circuit does not need modifying. The control method does not need extra investment, and reversible operation can be realized. A two-two breakover way is adopted, and extra dead area time does not need adding to control the permanent magnet brushless direct current motor to generate electricity. Generated voltage ripple is small, and stable voltage output can obtained with only a few filter waves, and the power generating control system and the control method are easy and reliable to realize.

The present invention relates to a low dropout regulator, and more particularly to a low dropout regulator without load capacitor and ESR (equivalent series resistance) designed in response to the discharge curve of a Li-ion battery, includes an input terminal, a reference circuit, a power transfer element, a level regulating device, a regulating circuit, and a first N-type MOSFET. The regulating circuit detects a load change at an output terminal, amplifies the load change, and couples it to the level regulating device. The level regulating device receives and boosts a received signal and transmits the received signal to the power transfer element, so as to achieve the effect of controlling the power of a power supply.

The invention relates to a screen printing machine for automatically selecting a screen plate, which includes a casing and a transmission mechanism arranged on the casing, a printing mechanism and a printing plate mechanism. The positioning mechanism includes a fixing plate, a first motor, a connecting block, a first wire Rod, limit rod, sliding block and code scanner, the selection mechanism includes cylinder, rotating assembly and clamping assembly, the screen printing machine that automatically selects the screen plate, drives the code scanner to scan the barcode on each screen plate through the positioning mechanism , each barcode corresponds to a unique screen version. When the barcode of the required screen version is scanned, the scanner sends a signal to the PLC, and the PLC stops the positioning mechanism and makes the selection mechanism work, and automatically selects the Compared with manual selection, the required screen plate reduces labor intensity, saves time and effort, and thus improves printing efficiency.

The invention discloses a high-voltage switchgear of a single busbar system, which includes a base, a purification box and a controller. The top of the purification box is sequentially provided with an alarm, a temperature sensor, a first air quality sensor and a display. The air inlet end of the purification box is equipped with an air inlet protection net, and a wind collecting hood is installed inside the purification box inside the air inlet protection net, and a water tank is installed inside the purification box near the wind collecting hood, and one of the water tanks is An exhaust hood is installed in the side purification box, and a nano-plant fiber filter layer, a crystal activated carbon filter layer, a HEPA filter layer and a nano-photocatalyst decomposition filter layer are detachably installed in the side purification box at the opening of the exhaust hood. The present invention is provided with a series of structures so that the high-voltage switchgear can effectively prevent power failure and has extremely high safety.

The invention discloses an LCLCL high-order DC converter based on stacked bridges and a control method, and belongs to the technical field of power converter design. The problems that the voltage input range of an existing LLC resonant converter is limited, and voltage input fluctuation is likely to be generated are solved. The converter comprises a switching tube S1, a switching tube S2, a switching tube S3 and a switching tube S4 which are sequentially connected to form a stacked bridge; a band elimination filter, a primary side of a transformer T, a resonant inductor Lr and a resonant capacitor Cr are sequentially connected between an upper bridge arm and a lower bridge arm in series; one end of the secondary side of the transformer T is connected with the anode of a diode D1, the cathode of the diode D1 is connected with the cathode of a diode D2, and the anode of the diode D2 is connected with the other end of the secondary side of the transformer T; an output capacitor C0 is connected between the center tap of the secondary side of the transformer T and the cathode of the diode D2; and the output capacitor C0 is connected in parallel with the load resistor RL. According to the invention, wide-range voltage input is realized, and the loss of the secondary side diode is reduced.

The invention relates to the technical field of a high-current control circuit and specifically relates to a low-voltage and high-current control circuit. The circuit comprises a direct current boost module, an MOS transistor control module, a power module and a direct current boost control module. The direct current boost control module, the direct current boost module, the MOS transistor control module and the MOS transistor power module are connected in sequence. The direct current boost module is a direct current voltage doubling circuit composed of a diode D1, the diode D2, a capacitor C2, the capacitor C2, a switch tube Q1 and the switch tube Q2. The switch tube Q1 and the switch tube Q2 are switched repeatedly and circularly according to certain frequency, and the stable voltage output can be realized, thereby driving an MOS transistor. A voltage 3.7V of a secondary lithium battery multiplies by 2 to obtain 7.4V, in this way, the 7.4 is greater than a threshold value of a general MOS transistor starting voltage 4V, the problem that the single secondary lithium battery cannot switch on the general MOS transistor due to low voltage is solved, the circuit is simple and reliable, is high in operability and low in cost and has high creativity.

The invention belongs to an inverse circuit, in particular to a three-phase four-wire inverter circuit. The invention relates to a three-phase four-wire inverter circuit which comprises a DC power supply, a three-phase inverse circuit and an AC filter circuit that are connected in sequence; the invention is mainly characterized in that a neutrality point adjusting circuit is connected with the three-phase inverse circuit in parallel and is connected between the DC power supply and the AC filter circuit. The circuit of the invention has the advantages of creatively adding a neutrality point in the circuit and compulsorily leading the voltages of the two ends to maintain consistent; the elements added are fewer and the alternation to the original circuit is less, but the output end of the three-phase four-wire inverter circuit can output stable voltage even if the loads are not symmetrical, thus increasing the loading capacity of the inverter.

The invention discloses a multifunctional low-noise nuclear instrument power supply experimental platform. The multifunctional low-noise nuclear instrument power supply experimental platform comprisesa supply circuit, an analog-digital converter ADC, a digital analog converter DAC, a micro-processor MCU, a capacitive touch screen, a keying circuit, a storage, an isolation transformer and a buzzer. The supply circuit comprises a rectifier filter circuit, a first low pressure supply circuit and a third low pressure supply circuit, a positive high pressure output circuit, a negative high pressure output circuit and a second low pressure supply circuit, wherein the first low pressure supply circuit and the third low pressure supply circuit are both connected with the rectifier filter circuit,the positive high pressure output circuit and the negative high pressure output circuit are both connected with the third low pressure supply circuit, and the second low pressure supply circuit is connected with the first low pressure supply circuit; the output of the first low pressure supply circuit, third low pressure supply circuit, positive high pressure output circuit and negative high pressure output circuit is all connected with the analog-digital converter ADC and the digital analog converter DAC; and the input of the isolation transformer is connected with a mains supply and the output of the isolation transformer is connected with the rectifier filter circuit. The multifunctional low-noise nuclear instrument power supply experimental platform has the advantages that the structure is simple, the noise is low, the anti-interference ability is strong, the voltage output is stable, and the development cost is reduced.

The embodiment of the invention provides a flyback switching power supply and a power supply system. The flyback switching power supply comprises a control module, a monitoring module and a transformer, wherein the control module is connected with one end of a primary-side winding of the transformer and is used for controlling the primary-side winding to generate a corresponding first pulse signalaccording to a current frequency within a preset frequency range, the current frequency periodically fluctuates within the preset frequency range, and the monitoring module is connected with the control module and is used for sampling the first pulse signal by the control module and sending the obtained sampling signal to a power management chip. By the flyback switching power supply, electromagnetic interference generated by a power supply circuit can be effectively reduced, the structure is small and is easy to maintain, a voltage can be adjusted according to a real-time load, and the situation that a power supply voltage is reduced due to overload is prevented.

The invention provides a large-transformation-ratio wide-input step-down circuit and device. The circuit comprises a power supply, a first switch loop, a first low-pass filter circuit, a second switchloop, a second low-pass filter circuit and a load. The power supply is electrically connected with the first low-pass filter circuit through the first switch loop, the first low-pass filter circuit is electrically connected with the second low-pass filter circuit through the second switch loop, and the second low-pass filter circuit is electrically connected with the load, wherein the first switch loop is used for carrying out on-off control according to the ratio of power supply voltage to load voltage. Based on the invention, according to the transmission ratio requirement of the voltage, the first switch loop performs switching work, and so when the input voltage changes in a large range, a system can maintain efficient electric energy conversion and stable voltage output to supply power to the load.

The invention relates to the technical field of unmanned aerial vehicle equipment, in particular to an airborne series oil-electric hybrid power system. The airborne series oil-electric hybrid power system comprises an ASH controller, an engine, a generator, a standby battery and a power converter. The ASH controller is electrically connected with a servo, a first sensor, a second sensor, a sensor, a third sensor, a fourth sensor, a fifth sensor, a six sensor and a seventh sensor through guide wires. The server, a fuel tank, a starter and an igniter are electrically connected with the engine through guide wires. The engine is electrically connected with one ends of the first sensor and a reducer through guide wires. The other end of the reducer is electrically connected with the generator.The generator is electrically connected with the third sensor and the fifth sensor through guide wires. The airborne series oil-electric hybrid power system can provide stable voltage output and long-time high-power power energy output, the system uses a modular structure, it is ensured that late period maintenance is simple and convenient, meanwhile, the airborne series oil-electric hybrid powersystem has the advantages of being small in size, low in weight, high in reliability and the like.