66results about How to "Achieve high frequency" patented technology

The invention discloses a non-complementary flyback active clamp converter. The non-complementary flyback active clamp converter comprises a transformer, a main switching tube, a clamp switching tube, a clamp capacitor and a drive module. The drive module outputs main drive signals to the drive end of the main switching tube, and the driving signals are used for controlling the main switching tube to be alternately switched on and switched off. The drive module outputs clamp drive signals to the drive end of the clamp switching tube. The clamp drive signals and the main drive signals have the same period. Each period comprises a first pulse signal which is generated when the switching-on state of the main switching tube is converted to the switching-off state, a second pulse signal which is generated when the main switching tube is in the switching-off state, and a signal which is generated at the remaining time and used for controlling the switching-on and the switching-off of the clamp switching tube, wherein the first pulse signal and the second pulse signal are independent of each other and both used for controlling the switching-on and the switching-off of the clamp switching tube. By the adoption of the non-complementary flyback active clamp converter, it is guaranteed that a high-frequency current generated when the clamp capacitor is charged fully flows through the clamp switching tube and avoids a backward diode of the clamp switching tube.

The invention relates to electric-power, electron and electric-energy circuits, aim to provide an isolated soft switching two-diode forward resonant DC / DC (direct-current/direct-current) circuit. The circuit comprises a power source, two switching diodes, two clamping diodes, a high-frequency isolation transformer, a primary winding, a secondary winding, an output rectifier diode and an output filter capacitor, and further comprises an input side inductor, a resonant inductor and a resonant capacitor. The resonant capacitor Cr is connected with the power source in parallel, and the input side inductor is located between the resonant capacitor and the power source. The resonant inductor is connected with the transformer primary winding in series. Load formed by the resonant inductor, the resonant capacitor and the output voltage forms resonant circuits in series. By the isolated soft switching two-diode forward resonant DC / DC circuit, a power switching diode operates while zero voltage switches on and quasi-zero current is in switched off state, voltage at two ends of the power switching diode is reduced, overlap time of current passing through the power switching diode is reduced, and switching consumption of the power switching diode is reduced; energy on parasitic inductors or capacitors can be recovered, and energy converting efficiency is improved; energy consumption on the circuit is reduced, and energy is saved.

The invention discloses a switching-loss-free full-bridge non-isolated photovoltaic grid-connected inverter and an on-off control timing sequence. The inverter comprises a voltage division capacitance branch, a high-frequency main switching unit, a resonant network and a low-frequency change-over switch unit. Two sets of zero-current switching branches composed of the resonant network composed of full control switches, resonant capacitors and resonant inductors and auxiliary follow current clamping diodes are added, the on-off control timing sequence is matched, the zero-current turning-on and zero-current turning-off conditions of a fifth power switch tube S5 and a sixth power switch tube S6 can be achieved, the zero-current turning-on and zero-current turning-off conditions of a fifth auxiliary power switch tube Sa5 and a sixth auxiliary power switch tube Sa6 can be achieved, the reverse restoration of low-frequency change-over switch unit diodes D1-D4 can be eliminated, it is guaranteed that the common-mode voltage of the inverter is constantly one second of a battery voltage in the power transmission process, the resonance period and the follow current stage to eliminate leak currents, and therefore high frequency and minimization of the non-isolated photovoltaic grid-connected inverter can be achieved.

The invention provides a non-isolated photovoltaic grid-connected inverter capable of performing high-frequency soft switching operation, with low leakage current, and a switching control time sequence thereof. The non-isolated photovoltaic grid-connected inverter comprises voltage-dividing capacitance branch (1), a high-frequency main switch unit (2), a resonance network (3), a clamping branch (4) and a low-frequency reversing switching unit (5). The non-isolated photovoltaic grid-connected inverter has the advantages that two controllable switching tubes, a diode and two inductance-capacitance branches are respectively added on the basis of a single-phase six-switch full-bridge inverter circuit (known as 'H6' topology) to form the resonance network to provide zero-voltage switching operating conditions for the main switch unit, the soft switching operation of a high-frequency switch is realized, and the switch loss can be greatly reduced; common mode voltage can also be ensured to be a constant voltage value at a power transmission stage, a resonance stage and a continuous current stage through the switching time sequence, so that the leakage current of the non-isolated grid-connected inverter is eliminated; and the non-isolated photovoltaic grid-connected inverter can realize high frequency, and is beneficial to greatly reducing the volume, the weight and the cost.

The invention relates to a high-frequency multiphase interleaved conversion device and a control method, and belongs to the field of power electronics and electric drive. The device comprises a drive and power amplification unit, an EV (Electric Vehicle) manager module, an AD (Analog-Digital) sampling module, a DSP (Digital Signal Processor) processor, a serial port communication module, an HCI (Human-Computer Interaction) module, a DC (Direct Current) voltage detection circuit, a DC voltage conditioning circuit, a current detection circuit, a current conditioning circuit and a main circuit. The system adopts a double closed-loop control technology and a new topological structure to realize system stability and broad stability margin; three inductors at the front end of the topological structure work alternately, and the equivalent switching frequency is 6 times of the traditional switching frequency, so that the whole converter has high frequency, and the output voltage and the ripple amplitude and harmonic component of current are reduced; and the equal-time work of the three front-end inductors per unit time reduces the power requirements on power components IGBT (Insulated Gate Bipolar Transistor) and diodes, reduces the manufacturing cost of the whole device, and improves the application value of the DC converter.

The invention discloses a hydraulic impactor. A piston comprises a striking section, a front-cavity section and a rear-cavity section; diameters of the striking section, the front-cavity section and the rear-cavity section are increased sequentially; the striking section of the piston is mounted on a cylinder body through a guide sleeve; the front-cavity section of the piston is arranged in a front cavity of the cylinder body; the rear-cavity section of the piston is arranged in a rear cavity of the cylinder body; a flat valve is mounted in the rear cavity of the cylinder body; a cavity is formed between the valve body of the flat valve and the rear-cavity section of the piston; the part, located outside the valve body, of a valve core of the flat valve is arranged in the cavity; the core valve of the flat valve and the piston are arranged coaxially; the front cavity of the cylinder body is connected with a high-pressure oil port; the rear cavity of the cylinder body can be communicated with high-pressure oil and return oil through a feedback oil duct and an oil guide groove respectively; and a rodless cavity of the flat valve can be connected with the rear cavity of the cylinder body and the return oil through the feedback oil duct. The hydraulic impactor improves the rock breaking efficiency, has an anti-idling function, prolongs the service life of a drill tool, and reduces the processing difficulty.

A novel wide-range input power conversion circuit which accords with a wide-range input condition is composed of a voltage pre-adjusting unit and an output voltage adjusting unit and an output voltage adjusting unit, wherein the voltage pre-adjusting unit and the output voltage adjusting unit are connected through an inductor unit. The voltage pre-adjusting unit comprises a pair of leg which are connected with two ends of input voltage. The midpoint of each leg is connected with one end of an inductor unit. The output voltage adjusting unit is a power converter which is composed of a pair of legs, a bus capacitor and a power conversion network. The midpoint of the leg is connected with the other end of the inductor unit and finishes a voltage increase function together with the bus capacitor. The leg and the power conversion network form a topological circuit such as an LLC topological circuit and a full-bridge topological circuit. Through multiplexing the legs, the number of power devices is reduced, loss is reduced and efficiency is improved. Through adjusting the duty ratio of the two legs, adjustment for output voltage of a conversion circuit is realized. Through adjusting the conduction time sequence of two leg switches, soft switching on-and-off of all switching tubes is realized. An adjusting unit and an output voltage adjusting unit can be realized in a parallel or staggered parallel manner.

The invention relates to the field of switching power supplies, in particular to a soft switching resonance BUCK converter adopting pulse width modulation control. According to the converter, on the basis of a traditional BUCK converter, two diodes and one resonant capacitor are added, and a pulse width modulation mode is adopted, so that the soft switching of all switching devices can be realized. The converter is composed of an input filter capacitor, a BUCK converter upper tube, a BUCK converter lower tube, a BUCK converter inductor and an auxiliary diode upper tube, an auxiliary diode lower tube, a resonance capacitor and an output filter capacitor; by virtue of the converter, zero voltage switching of the BUCK converter upper and lower tubes can be realized; and meanwhile, the zero-current switching of the two auxiliary diodes can be realized. In addition, a control mode adopted by the converter is the pulse width modulation mode, so that the converter is easy to control, and a special controller is not needed.

The invention relates to a manufacturing method of a transistor and especially relates to a manufacturing method of a ring-fence non-junction nanowire transistor. MOCVD is used to epitaxially grow a doped nanowire array on an III-V family material. Through a thermal peeling adhesive tape and a fixing panel, the nanowire is transferred. A non-junction nanowire transistor with a ring-fence structure is manufactured on a silicon-based substrate. By using the manufacturing method of the ring-fence non-junction nanowire transistor provided in the invention, compatibility of an III-V family material nanowire and a plane silicon technology can be realized; simultaneously, mobility degeneration is effectively restrained and a current driving capability of the transistor is increased.

The invention discloses a manufacturing method of a dielectric waveguide radio frequency device, and relates to a manufacturing method of a waveguide radio frequency device. The invention aims to solve the problems that the existing method for preparing the ceramic waveguide radio frequency device is high in cost, low in processing efficiency, poor in size precision and poor in surface quality, so that the performance of the device is reduced, and the ceramic waveguide radio frequency device cannot be prepared on a large scale. The method comprises the following steps: 1, carrying out sectioning; 2, carrying out slotting; 3, processing tuning holes; 4, machining an energy input hole; 5, carrying out glue spreading and stacking; 6, carrying out bonding; and 7, carrying out overall metallization to obtain the dielectric waveguide radio frequency device. According to the invention, more complex and diversified device topological structure manufacturing can be realized, the device manufacturing difficulty is reduced, and the precision margin is improved; the processing precision is high, the process stability is good, and precise manufacturing of a subminiature dielectric waveguide radio frequency device can be realized, so that high frequency of the device is realized. According to the invention, the dielectric waveguide radio frequency device can be obtained.

The embodiment of the invention relates to a resonant type switching converter comprising a multilevel generating circuit and a resonant circuit. The multilevel generating circuit is capable of generating first voltage signals that at least have two values and are not larger than an input voltage. The resonant circuit reuses the part of or all power transistors in the multilevel generating circuitto reduce the input voltage of the resonant branch and realize high controllability, so that the voltage drops applied to the power transistors are reduced and the switching tube stress and the switch losses are reduced. Moreover, because of switching controlling between paths of multi-path first voltage signals having the same values, the switching frequency is increased equally, the high frequency is realized and the volume and cost of the system circuit are reduced.

The invention discloses a switching converter and a control method thereof. The switching converter comprises a positive input power supply, a negative output voltage, a power supply common ground, aswitch transistor Q1, a switch transistor Q2, a switch transistor Q3, a switch transistor Q4, an inductor L1 and a capacitor C1, wherein the drain electrode of the switch transistor Q1 and the drain electrode of the switch transistor Q3 are connected to the positive input power supply, the source electrode of the switch transistor Q1 and the drain electrode of the switch transistor Q2 are connected to one end of the inductor L1, the source electrode of the switch transistor Q3 and the drain electrode of the switch transistor Q4 are connected to the other end of the inductor L1, the source electrode of the switch transistor Q4 is connected to one end of the capacitor C1, and the source electrode of the switch transistor Q2 and other end of the capacitor C1 are connected to the power supplycommon ground. According to the invention, the input voltage and the output voltage are opposite in polarity, all switch transistors ZVSs are turned on, and the efficiency is high; fast demagnetization of the inductor L1 can be realized when the absolute value of the ratio of the input and output voltage is great, the current waveform of the inductor L1 is changed from triangular into quadrilateral, and the high-frequency efficient operation of the switching converter is realized.

The invention discloses a boosted circuit of a direct-hanging high-voltage power supply and a soft start method. The boosted circuit comprises an inductor L1, a switch S1, a diode D1 and a diode D2. One end of the inductor L1 is connected with a capacitor C1, the switch K1 and the anode of the diode D3; the other end of the switch K1 is connected with a low-voltage power supply; the other end of the inductor L1 is connected with the switch S1 and the anode of the diode D1; the cathode of the diode D1 is connected with a capacitor Cfly, a resistor RS3 and the anode of the diode D2. In an outputdirect-hanging high-voltage power supply application scene circuit, a novel three-level flying capacitor circuit is used and the unique soft start circuit is cooperated and all the switching voltagelevel of the system can be reduced by half. The low-voltage semiconductor switching characteristic is good and the selectivity is high so that the high frequency of the whole circuit can be realized,the inductance volume can be reduced, the volume of the whole mechanism can be reduced, and the cost of the whole system can be reduced.

The invention discloses an amplifier capable of continuously adjusting high-frequency micro-signal times for a mass spectrometer. The amplifier comprises a first-stage amplifier, a second-stage amplifier, a first third-stage amplifier, a first fourth-stage amplifier, a first load, a second third-stage amplifier, a second fourth-stage amplifier and a second load, wherein an output end of the first-stage amplifier is connected to an input end of the second-stage amplifier; an output end of the second-stage amplifier is connected to an input end of the first third-stage amplifier and an input endof the second third-stage amplifier respectively; an output end of the first third-stage amplifier is connected to an input end of the first load through the first fourth-stage amplifier; and an output end of the second third-stage amplifier is connected to an input end of the second load through the second fourth-stage amplifier. Through adoption of the amplifier, the mass spectrometer, particularly a time-of-flight mass spectrometer can read electronic time resolution. Moreover, each stage of amplifier can be adjusted in amplification times to amplify different micro-signals by different amplification times, so that the instrument sensitivity is increased greatly.

The invention discloses a PWM rectifier control method with uncontrolled inductance current minimum phase. The method includes sampling the three phase currents ia, ib and ic of a, b and c of a PWM rectifier, comparing the three phase currents ia, ib and ic, and determining the minimum current; according to a spatial voltage vector command value V*, determining the sections, where the spatial voltage vector command value V* located, of a complex plane; according to the different sections of the complex plane of the spatial voltage vector command value V*, composing the spatial voltage vector command value V* through different basic vectors; determining the actions of switch tubes, and avoiding controlling the minimum phase of the inductance current of the PWM rectifier. According to the control method, the switch consumption of the PWM rectifier is reduced, the efficiency of the PWM rectifier is improved, the higher sampling frequency can be provided to the PWM rectifier during operation, and the high frequency and lightness of the PWM rectifier can be realized.