34results about How to "Achieve boost" patented technology

The invention discloses a three-mode frequency conversion soft switching control method of a four-tube Buck-Boost converter and belongs to the field of direct current-direct current converters of electric energy conversion devices. The method is characterized in that a minimum value of the inductive current is controlled to be unchanged by changing the switching frequency so that the converter realizes soft switching in a full-load range. A double-closed-loop control strategy combining a voltage outer loop and a current inner loop is adopted for PWM modulation, PWM of a main power tube of theconverter is adjusted within a wide input voltage range, a purpose of adjusting a duty ratio of a Buck unit and a Boost unit is achieved, and therefore output voltage is controlled. A three-mode control method is adopted, and a working mode of a main circuit is selected by sampling and comparing input and output voltages. The method is advantaged in that wide-voltage-range input adaptive to the converter is realized, and soft switching is realized in a full-load range by combining minimum inductive current control and frequency conversion control, so switching loss of the converter is greatlyreduced.

The invention provides a four-switch MPPT (Maximum Power Point Tracking) controller. The four-switch MPPT controller comprises a photovoltaic power supply, a photovoltaic anti-reverse protection unit,a four-switch Buck-Boost conversion unit, a battery reverse connection protection unit and a load control protection unit connected in order; the battery reverse connection protection unit is connected with a storage battery, and the load control protection unit is connected with the battery reverse connection protection unit and the load; the photovoltaic anti-reverse protection unit is used toavoid damaging of the solar controller caused by reverse connection of the photovoltaic power supply; the four-switch Buck-Boost conversion unit is configured to achieve buck and boost of the controller; the battery reverse connection protection unit is used to avoid damaging of the solar controller caused by reverse connection of the storage battery; and the load control protection unit is configured to avoid damaging of the solar controller caused by too large load, reverse connection and short circuit. The four-switch MPPT controller has a buck-boost function, is low in power device voltagestress and few in reactive elements, has the input and output like polarity and common ground, and is suitable for occasions in a wide input voltage range.

The invention discloses a light-emitting diode (LED) constant current drive circuit and an LED lighting device, wherein the LED constant current drive circuit comprises a power source and an LED load, the power source is connected with the LED load, and the LED constant current drive circuit further comprises a boost-type constant current output circuit and a power control circuit. The boost-type constant current output circuit is used for outputting constant current to the LED load, and the power control circuit is connected with the power source, the LED load and the boost-type constant current output circuit and used for conducting power supply control and protecting power supply of the LED load. The LED constant current drive circuit serves as the boost-type constant current output circuit so that boosting and decompression control can be achieved by controlling the duty ratio of pulsing communication and pulsing closing of a metal oxide semiconductor (MOS) pipe in a constant current chip according to the value of the sampled voltage, and therefore the output current is controlled to a preset value so as to keep constant current output, the LED can be driven to work safely and reliably.

The invention provides a direct current transformer capable of implementing buck-boost conversion. The direct current transformer comprises a first chain type module and a second chain type module, wherein the first chain type module and the second chain type module are connected in parallel; one end of the first chain type module is connected with the anode connection end of a first power supply, and the other end of the first chain type module is connected with the cathode connection end of the first power supply; and one end of the second chain type module is connected with the cathode connection end of a second power supply, and the other end of the second chain type module is connected with the anode connection end of the second power supply. The direct current transformer further comprises an inductor L and an inductor La, wherein one end of the first chain type module is connected with the anode connection end of the first power supply by the inductor La, and the other end of the first chain type module is connected with the cathode connection end of the first power supply by the inductor L; and the other end of the second chain type module is connected with the anode connection end of the second power supply by the inductor L. Various direct current transformers provided by the invention can simultaneously implement buck-boost conversion; and the direct current transformer provided by the invention is simple in structure, reasonable in layout and easy to popularize.

The present invention provides a boosting and assisted unplugging locking device and a cabinet device by using the same. The boosting and assisted unplugging locking device includes a screw thread seat fixed on a bracket and a support seat fixed on the cabinet; the screw thread seat is provided with a threaded hole extending along the front and back direction of the axis; the support seat is provided with a punching hole being coaxial with the threaded hole; a rotatable boosting and assisted unplugging piece passes through the punching hole and is installed in the punching hole; the boosting and assisted unplugging piece includes a torque input end, being in blocking matching with the support seat, located at the front side of the punching hole and an end of thread, being in threading matching with the threaded hole, located at the rear side of the punching hole to allow the torque input end to drive the support seat to move backwards to realize boosting when the torque is inputted; and the boosting and assisted unplugging piece also includes a pushing portion, being in the pushing matching with the support seat, located at the back side of the punching hole to allow the pushing portion to drive the support seat to move forwards for realizing assisted unplugging when the reverse torque is inputted. The boosting and assisted unplugging locking device and the cabinet device by using the same are simple in structure and small in size, and do not occupy large installation space and operation space.

The invention discloses a control method for a bidirectional DC-DC converter based on a Z source, and aims to provide a method for controlling the voltage rising and dropping of the converter within a wide range, short-circuit protection, energy flow control and the switching of forward-reverse energy flow. The technical scheme adopted by the invention is that a control unit in the converter is improved, so that the control unit consists of a voltage calculating unit, a voltage deviation calculating unit, a voltage controller, a current calculating unit, a current deviation calculating unit, a current controller and a failure monitoring unit, and then a double parallel closed-loop control method for performing single closed-loop control on electric current and voltage is adopted to control the energy flow of the converter. According to the invention, the control of output voltage rising and dropping within a large range is realized; the independent control of the electric current and the voltage, and the decoupling control of variates are realized; the smooth switching of energy flow can be realized without stopping the converter; the short-circuit failures of input and output can be rapidly judged, and failure protection can be rapidly performed.

The invention discloses a rechargeable lithium battery electric soldering iron device with temperature regulation, temperature control and constant temperature functions. According to the rechargeablelithium battery electric soldering iron device, real-time monitoring of the temperature of an electric soldering iron with a built-in thermocouple is achieved through the design of a 32-bit single-chip microcomputer and an analog circuit; technical optimization is carried out based on an existing portable electric soldering iron, and real-time temperature detection is carried out through the built-in thermocouple of the electric soldering iron, and therefore, boosting of a single lithium battery is achieved, the magnitude of the output voltage is controlled, the temperature compensation is realized, and the constant temperature of an electric soldering iron head is output within the full-voltage range of the lithium battery. According to the constant-temperature control device, a voltagestabilizing circuit module is designed, and stable power supply voltage required by the single-chip microcomputer and a control system is realized by taking power from the lithium battery, and therefore, continuous power supply to the rest modules is achieved, an output power supply can realize the stable power supply voltage required by the single-chip microcomputer and the control system, work at the lowest voltage of 3V is achieved, and then the work of one single lithium battery is realized. The voltage stabilizing circuit module is a key design circuit of the design and aims to stabilizethe voltage required by the output circuit.

The invention belongs to the technical field of machining equipment, and particularly relates to a 2D wire bending machine which comprises a supporting seat, a workbench is fixedly connected to the supporting seat, a feeding mechanism, a cutting mechanism and a bending mechanism are sequentially arranged on the workbench, the bending mechanism comprises a bending supporting assembly, a wire limiting device and a wire bending device are installed on the bending supporting assembly, and the wire limiting device is connected with the cutting mechanism. The wire bending device comprises a bending rotating sleeve, at least one bending steel sleeve is arranged on the top face of the bending rotating sleeve, and a bending driving device used for driving the bending rotating sleeve to rotate is arranged on one side of the supporting assembly. Through reasonable design, the structure is reasonable, the wire cutting effect is good, the arc bending part is not prone to abrasion, the arc bending part is convenient to replace, and the wire feeding efficiency is high.

The invention discloses an intelligent indoor building material purchasing system and a purchasing method. The intelligent indoor building material purchasing system consists of a building material IC card, a user IC card, a wireless radio frequency communicator, a wireless receiving card reader, a computer, and a host computer database. and cloud database. The customer refers to the decoration style from the cloud database, selects different building materials through the radio frequency device of wireless communication, and transmits the selected material to the computer through the wireless receiving card reader. , start modeling and display a simulated house type, accompanied by the designer's suggestion, if you are not satisfied, you can buy it in time. The invention has the advantages that customers can choose building materials by themselves, and make choices immediately according to the effect of the room decorated by the selected materials, which is fast and convenient. I am not satisfied with the advantages of secondary reloading.

The invention relates to a high-gain bidirectional soft switching DC/DC converter based on a full-coupling inductor. The high-gain bidirectional soft switching DC/DC converter comprises six switchingtubes S1, S2, S3, S4, S5, S6, four inductors L1, L2, L3, L4, an independent inductor Ls, an input capacitor Cin and an output capacitor Cout. Due to the symmetry, the two sides of the converter can beused as input or output. According to the invention, either end of the structure can be used as an input end or an output end, the purpose of boosting or reducing voltage can be achieved when eitherend is used as an input end. According to the structure, a soft switching technology can be realized when bidirectional energy flow is realized; and the structure is simple in control method, and theoutput voltage control idea is the same as the traditional Buck/Boost control idea.

The invention discloses a buck-boost low-stress switched capacitor multi-level inverter, which can work in a boost mode and a buck mode, and can enable the voltage stress of all switching devices to be smaller than the input voltage. The inverter comprises a pre-stage switched capacitor unit, an extensible switched capacitor unit and a post-stage switched capacitor unit. The number of the extensible switched capacitor units can be zero or more; Boost and buck conversion are integrated, the input voltage range of the system is expanded, the flexibility of the inverter system is improved, and the inverter system can be independently applied to inductive loads.

The invention discloses a PFC and LLC resonance-based intelligent full-bridge correction wave voltage conversion circuit, which comprises an input rectifier unit, a filter unit, a PFC booster unit and an LLC isolating converter unit, wherein the LLC isolating converter unit comprises a first switch tube, a second switch tube, a first fly-wheel diode, a second fly-wheel diode, a transformer, a resonant capacitor and a discharge resistor; a drain of the first switch tube is connected to an output end of the PFC booster unit; a source of the first switch tube is connected to a first end of the transformer; a second end of the transformer is connected with front-end ground through the resonant capacitor; the drain of the second switch tube is connected to the source of the first switch tube; the source of the second switch tube is connected with the front-end ground through the discharge resistor; and a center tap of a secondary winding of the transformer is taken as the output end of the LLC isolating converter unit. According to the PFC and LLC resonance-based intelligent full-bridge correction wave voltage conversion circuit, the PF value of a voltage conversion device can be improved, the quality of output voltage can be improved and a safe and reliable effect can be achieved.

The invention discloses a dual-input boost inverter and a control method thereof, and belongs to the technical field of converters. According to one scheme, one end of a first input side is connected with an anode of D1, a cathode of D1 is connected with one end of L1, the other end of L1 is connected with a terminal 1 of S1, one end of L3 and an anode of D3, a cathode of D3 is connected with terminals 2 of S3 and S4, a cathode of D4 and a positive end of C1, an anode of D4 is connected with a terminal 1 of S2, one end of L4 and one end of L2, and the other end of L2 is connected with a cathode of D2. The anode of the D2 is connected with one end of the input side II; the other ends of the input side I and the input side II, the terminals 2 of the S1 and the S2 and the negative end of the C1 are grounded; the other end of the L3 and the terminal 1 of the S3 are connected to a point a, and the other end of the L4 and the terminal 1 of the S4 are connected to a point b; nodes a and b form an output side. Double power supplies are adopted for power supply, seamless switching of the two power supplies can be achieved, normal operation of the inverter is guaranteed, the stability of the system is improved, and higher voltage gain is obtained.