12results about How to "Stable voltage output" patented technology

The invention provides a resonant converter parameter optimization method and system of an electric vertical take-off and landing aircraft, and relates to the technical field of aviation power electronics. The method comprises the following steps: constructing an improved equivalent circuit model containing transformer secondary side leakage inductance; deriving a voltage gain function expression of the improved equivalent circuit model and an optimization calculation formula of the excitation inductance required for realizing the soft switching; parameter optimization is carried out based on the voltage gain function expression and the excitation inductance optimization calculation formula; and building an LLC resonant converter experimental prototype according to the optimized parameters, and carrying out system verification and performance evaluation. According to the invention, the problem of performance reduction caused by neglecting secondary side leakage inductance under a high-frequency working condition in a traditional design is solved, the efficiency, the voltage stabilization precision and the power density of the converter are remarkably improved, and the high requirement of eVTOL on an airborne power supply is met.

The present invention provides a power supply circuit, an ultrasonic radar and a vehicle. The power supply circuit includes a protection diode, whose input end is connected to a voltage source; a filter detection circuit, one end of which is connected between the voltage source and the protection diode and the other end is grounded, and the filter detection circuit is configured to filter the voltage of the voltage source and detect the voltage amplitude of the voltage source; a voltage stabilizing circuit, which is connected between the output end of the protection diode and the voltage output port of the power supply circuit and is configured to output a stable voltage; and a filter circuit, one end of which is connected between the voltage output port and the voltage stabilizing circuit and the other end is grounded, and is configured to filter the voltage output by the voltage stabilizing circuit. The power supply circuit of the present invention can achieve stable voltage output through the synergistic effect of the protection diode, the filter detection circuit, the voltage stabilizing circuit and the filter circuit, and is suitable for a wider input voltage range.

The application provides a sub-module quantity optimization configuration method of a modular multilevel converter, relates to the field of converters, and is applied to a segmented half-bridge-full-bridge hybrid modular multilevel converter including three-phase bridge arms, each phase bridge arm being composed of an upper bridge arm and a lower bridge arm, the upper bridge arm including cascaded half-bridge sections and full-bridge sections, the half-bridge section including at least two cascaded half-bridge type sub-modules, and the full-bridge section including at least two cascaded full-bridge type sub-modules, and the method comprises the following steps: constructing an amplitude function of an energy difference term of the half-bridge section and the full-bridge section; constructing an energy coupling degree function of the half-bridge section and the full-bridge section; constructing a bridge arm energy coordination function based on the amplitude function of the energy difference term of the half-bridge section and the full-bridge section and the energy coupling degree function; and determining the number of the half-bridge type sub-modules included in the half-bridge section and the number of the full-bridge type sub-modules included in the full-bridge section, so that the converter has the advantages of efficient and reliable support.

The utility model provides a fan wireless power supply device based on electromagnetic induction. The fan wireless power supply device comprises a transmitting end module and a receiving end module, the transmitting end module comprises a high-frequency inverter circuit, a transmitting coil and a transmitting end control circuit; the receiving end module comprises a receiving coil, a rectifying circuit, a voltage stabilizing circuit and a receiving end control circuit; the transmitting coil is connected with a direct-current power supply through a high-frequency inverter circuit; the receiving coil is used for receiving magnetic field energy emitted by the transmitting coil; the receiving coil is connected with a fan through a rectifying circuit and a voltage stabilizing circuit; the receiving end control circuit is used for modulating and outputting voltage and current information to the transmitting end control circuit; the receiving end control circuit is used for modulating and outputting voltage and current information to the transmitting end control circuit. Different from traditional physical connection modes such as connectors and wire harnesses for power supply connection, the wireless power supply technology eliminates physical interfaces, and energy transmission is carried out based on electromagnetic induction. And the high-frequency inversion technology and the magnetic core material coil are adopted, so that the efficiency and the stability of wireless power supply are remarkably improved.

The present invention belongs to the technical field of zinc-air batteries, and specifically relates to a carbon-coated iron selenide bifunctional catalyst supported by nitrogen-doped carbon nanotubes, and a preparation method and application thereof. Aiming at the problem that transition metal selenides are easy to agglomerate during application and are easily corroded under strong alkaline conditions, the present invention designs a carbon-coated iron selenide bifunctional electrocatalyst supported by nitrogen-doped carbon nanotubes, and the iron selenide is coated with graphite carbon. The graphite carbon shell can effectively reduce the agglomeration of FeSe2NPs and the corrosion of FeSe2NPs in the subsequent catalytic process, and the N-CNTs conductive network formed in situ can promote the rapid transfer of charges, and the strong interaction between the FeSe2NPs core, N atoms and iron atoms provides abundant atomic active sites, so that the obtained catalyst has stable ORR electrocatalytic performance and OER electrocatalytic performance, and is used as a cathode catalyst for zinc-air batteries.

The present invention belongs to the technical field of converter control, and discloses a method and system for suppressing low voltage ride-through overcurrent of a grid-type voltage management device. A phase-locked loop phase-locks the grid voltage, outputs a transformation angle θ, and the d-axis coincides with the grid voltage vector; the q-axis is perpendicular to the voltage vector direction, and the output of the q-axis voltage is adjusted by a PI regulator by giving iq_ref to change the reactive current magnitude, and control the reactive power injected into the grid; the d-axis coincides with the grid voltage vector, and the active component is controlled in the direction of the voltage magnitude in the d-axis direction; the rotation angle of dq / abc is composed of an active droop module, a basic frequency module, and a phase-locked loop module; and a grid amplitude calculation module is used to calculate the grid voltage. The present invention enables the inverter to have both voltage source and current source characteristics, thereby having good grid-building and grid-connected functions. Due to the control of the voltage loop of the d-axis, a stable voltage output can also be maintained when unplanned off-grid occurs.

The utility model relates to a touch mouse control circuit with a vibration feedback function, and relates to the technical field of mouse control circuits. The device comprises a controller, a power supply module, a first boosting module, a second boosting module, a motor driving module, a vibration feedback motor and a touch sensor, and the output end of the touch sensor is electrically connected to the input end of the controller; the voltage output end of the power supply module is electrically connected to the input ends of the first boosting module and the second boosting module, the output end of the first boosting module is electrically connected to the power supply end of the controller, and the output end of the second boosting module is electrically connected to the power supply end of the motor driving module; the vibration feedback motor is in controlled connection with the motor driving module, and the motor driving module is in controlled connection with the controller. The method has the advantages that clear feedback can be provided for customers, and the use experience is improved.

The utility model relates to realize bidirectional voltage conversion voltage stabilizing circuit and control circuit, wherein realize bidirectional voltage conversion voltage stabilizing circuit includes bidirectional voltage stabilizing / half voltage stabilizing circuit, bus capacitor, fixed proportion conversion circuit and high voltage bus, and the input side is connected with the output side through bidirectional voltage stabilizing / half voltage stabilizing circuit, high voltage bus and fixed proportion conversion circuit in proper order, and one end of bus capacitor is connected to high voltage bus, and its other end is grounded, is used for buffering filter, and the application realizes the bidirectional voltage conversion of high speed response and the stable voltage output through the synergistic effect of bidirectional voltage stabilizing / half voltage stabilizing circuit, bus capacitor and fixed proportion conversion circuit, and the accurate adjustment of control circuit.

The application discloses a device for coupling electrically-driven anaerobic ammonia oxidation-denitrification by using a microbial fuel cell, comprising a microbial fuel cell and a microbial electrochemical reactor; wherein the microbial fuel cell is single-chambered, the anode is an anaerobic sludge membrane-hung carbon brush, and the cathode is carbon cloth; the working electrode of the microbial electrochemical reactor is a carbon brush, anaerobic ammonia oxidation flocculent sludge is inoculated into the reactor under anaerobic conditions, and after stable biofilm is formed, the device is operated under anoxic conditions. When the device is used for degrading organic matters by using the microbial fuel cell, the generated electric energy is used for driving the anaerobic ammonia oxidation process in the microbial electrochemical reactor to couple denitrification for removing nitrogen elements in wastewater, so that no external electric energy is consumed, and recyclable electric energy can be generated, and no secondary pollution is caused, so that the device is an environment-friendly wastewater treatment structure which is capable of removing nitrogen and carbon.

The utility model relates to the technical field of currency counters, and discloses a high-precision current-controlled constant current source currency counter, which comprises a currency counting mechanism, an energy supply control mechanism is arranged at the top end of the currency counting mechanism, the currency counting mechanism comprises a main machine body, a currency inlet is arranged below the front end of the main machine body, and a currency outlet is arranged below the rear end of the main machine body. An electric guide rail is fixedly installed in the middle above the front end of the main machine body, and an electric lifting seat is slidably assembled on the outer side of the electric guide rail. According to the utility model, the UPS power supply is adopted to supply power to the currency counting machine, so that the voltage output can be stabilized, the currency counting machine can be ensured to work stably under the rated voltage, and the influence on the accuracy and efficiency of currency counting caused by the damage or unstable work of electronic components of the currency counting machine due to the abnormal voltage can be avoided; therefore, the stability and the anti-interference capability of the current stabilization source are improved.

The utility model discloses a PID temperature control circuit applied to a microbial culture monitor. The PID temperature control circuit comprises a PID controller and a PID control circuit, the PID controller is used for receiving target temperature, incubation frame bias temperature and PID control parameters issued by the upper computer, receiving temperature parameters, sent by the PID control circuit, of all incubation frames in real time, conducting PID operation on the temperature parameters, outputting PWM adjusting signals to the PID control circuit according to operation results, and adjusting the temperature of the incubation frames by changing the output quantity of the PID control circuit. And the output power of the heating component or the refrigerating component is adjusted. The three-state buffer can buffer and isolate signals, prevent noise from interfering with the PID controller, protect the sensitive PID controller from being damaged by a rear-end circuit, and prevent residual output signals of the PID controller from influencing turn-off logic. In emergency, the output of the PID controller is cut off according to the emergency stop signal, so that the power switch device is quickly closed, the power output of the temperature control load is stopped, and the emergency stop function is realized.