58 results about "Sinusoidal waveform" patented technology

This invention provides an inverter load simulation device capable of producing a sinusoidal waveform output with suppressed distortion even at high switching frequencies. [Solution] The inverter load simulation device 1 includes switching circuits 13, 23, 33 which are bridge circuits composed of a plurality of switching elements SW1 to SW4, a drive control unit 51 which controls the driving of the plurality of switching elements SW1 to SW4 in the switching circuit 13, a filter 40 which converts the voltage output from the switching circuit 13 into a sinusoidal voltage, isolated DC / DC 11, 21, 31 which supply a DC voltage to the switching circuits 13, 23, 33 and which can change the DC voltage, and a DC voltage adjustment unit 52 which changes the DC voltage output by the isolated DC / DC 11, 21, 31 according to the voltage Vo output to the inverter P under test.

A method is provided for reducing common mode voltages in a system that includes an inverter connected to a motor by a long cable by controlling switches of the inverter to generate voltage vectors that emulate a three-phase sinusoidal waveform by switching between adjacent active vectors and active vectors that are separated by 180 degrees, determining whether a phase angle of the vectors is increasing or decreasing, determining a decision angle within the sector which is a function of a duty cycle offset and a modulation index; and applying duty cycle manipulation rules, including: responding to an increasing phase angle that is less than the decision angle by setting a duty cycle of the adjacent active vectors to a duty cycle high value; and responding to an increasing phase angle that is greater than 60 degrees minus the decision angle by setting the duty cycle to a low value.

The invention relates to the technical field of thermal interface material defect detection, in particular to a nondestructive detection method and system for thermal interface material application defects, and the system comprises an electric displacement table, heating laser, detection laser, a photoelectric detector, an acoustic optical modulator, a lock-in amplifier, an optical element and a data processing unit; the electric displacement table is used for fixing a sample and accurately controlling the position of the sample; the sample is of a silicon-thermal interface material-substrate sandwich structure; the upper-layer silicon wafer of the sample is plated with a metal film as a transduction layer; the heating laser is used for heating the sample; the acoustic optical modulator is used for modulating the heating laser, so that the heating laser heats the sample in a sine wave form; the detection laser is used for detecting sample temperature fluctuation; the photoelectric detector is used for collecting and detecting laser reflection signals; the lock-in amplifier is used for extracting and detecting laser phase and amplitude signals. According to the invention, non-destructive rapid detection of the defects of the thermal interface material in an application scene can be realized.

A voltage controller (204) detects (604) a voltage spike (244) in an electrical signal received from an electrical power source (208). The voltage controller (204) is implemented using a single-loop control system in a stationary reference frame. The electrical signal includes voltage harmonics caused by a non-linear or unbalanced load (256). The voltage controller (204) includes a phase-compensated harmonic regulator (220) that regulates the voltage harmonics present in the electrical signal and receives a feedback voltage (240) of the single-loop control system. The feedback voltage (240) is a delayed version of an instantaneous voltage (236) of the electrical signal. The instantaneous voltage (236) is sub-transiently stabilized into a steady-state voltage (232) based on the feedback voltage (240). Sub-transiently stabilizing the instantaneous voltage (236) is performed within a single cycle after the voltage spike (244) is detected (604). The steady-state voltage (232) has a total harmonic distortion less than a threshold total harmonic distortion and the steady-state voltage has a balanced sinusoidal waveform.

The present disclosure provides a RF power delivery method for delivering the RF power to a plasma load in a microelectronic manufacturing environment. The RF power delivery method includes generating a harmonically distorted sinusoidal waveform. Such harmonically distorted sinusoidal waveform being derived from a predetermined harmonic signature corresponding to a desired plasma state. Next, the method includes amplifying the harmonically distorted sinusoidal waveform and capable of operating under conditions of high reflected power. Next, the method includes interfacing with a non-linear plasma load impedance. Thereafter, the method includes measuring the RF power spectrum at an output of the fixed impedance matching network, the measured spectrum being used to adjust the amplified harmonically distorted sinusoidal waveform to recreate a desired plasma state.

In one embodiment, an interconnect apparatus (e.g., an interposer apparatus) includes a plurality of interconnect probes that each include a wave spring structure that includes a plurality of stacked wave spring discs. The wave spring discs may be formed in a sinusoidal wave form shape, or in another wave form shape.

The application discloses a combined high-g-value half-sine shock waveform generator and method, which comprises a gas storage tank, a launching cylinder, a combined waveform generator and a shock piston. A quick release device is arranged in the gas storage tank to instantaneously release compressed gas, and the compressed gas pushes the shock piston to move linearly along the launching cylinder at an acceleration. The shock piston collides with the combined waveform generator, an acceleration sensor on the shock piston records the acceleration signal of the shock process, and reflects the shock waveform experienced by the test piece. The combined waveform generator is composed of three material media of fiber non-woven fabric, polyurethane and asbestos. By changing the proportion of the three material media, the problem of strong nonlinearity of a single material medium can be corrected, and a high-g-value half-sine shock waveform complete in waveform and meeting a standard tolerance band can be obtained under high-speed impact. The application solves the problem of nonlinear mechanical behavior of a single material medium under high overload impact, and obtains a half-sine waveform meeting the standard tolerance band.

The application provides a power measurement device and method based on an analog quantum voltage source. The first standard voltage source in the power measurement device is an analog quantum voltage source and is used to generate a first standard quantum voltage in a sinusoidal waveform. The second standard voltage source is an alternating quantum voltage source and is used to output a second standard quantum voltage in a sinusoidal step wave. In the case where the other end of the switch is connected to the second standard voltage source, the processor adjusts the first standard quantum voltage based on the second standard quantum voltage. In the application, the standard quantum voltage of the alternating quantum voltage source is transmitted to the analog quantum voltage source. The pure sinusoidal wave signal of the analog quantum voltage is conducive to reducing the difference value of the power difference sampling, realizing continuous measurement, reducing the requirement for the stability of the power source, and realizing a double-pass analog quantum voltage source, and simplifying the differential measurement control of the voltage and the current in different phases.

The application discloses a morphological super-drilling offshore rock-embedded single pile foundation and a construction method, and belongs to the technical field of offshore engineering. In view of the problems of single geometric form, synchronous brittle failure and insufficient bearing capacity of the interface of the existing rock-embedded pile, a morphological super-drilling area in the shape of a sinusoidal wave curved surface is formed below the pile body, and the area is filled with a material to be integrated. The construction steps include: drilling construction; a sinusoidal wave curved surface is formed by adopting high-pressure water jet and variable-diameter mechanical cutter compound cutting, the contour accuracy is ensured to be less than or equal to 5 mm through a laser ranging camera and closed-loop control; primary positive circulation hole cleaning and secondary air-lift reverse circulation combined high-pressure water jet hole cleaning are sequentially implemented; after the hole cleaning is qualified, primary self-leveling grouting, secondary high-pressure splitting grouting and tertiary steady pressure supplementary grouting are implemented. The shear dilation effect and asynchronous failure mechanism of the sinusoidal wave curved surface make the vertical bearing capacity of the rock-embedded pile be 2 to 12 times higher than that of the traditional rock-embedded pile, the failure mode is ductile, the construction consistency is good, and the construction cost of the deep-sea rock-embedded pile is reduced.

An image sensor is disclosed. The image sensor may include a plurality of sensing nodes electrically connected to at least one circuit of the circuits, the sensing nodes formed on the first side of a silicon layer adjacent to the circuits. Each sensing node may include a floating diffusion structure connected to one of at least one channel of the circuits and an output circuit. Each sensing node may include a charge reset structure configured to remove a charge from the floating diffusion structure. Each sensing node may include a noise-cancellation gate electrode adjacent to the floating diffusion structure and configured to be driven by a noise-cancellation signal. The image sensor may include a resistive gate electrode configured for at least one of direct current or non-pulsed signals. A charge reset structure of each sensing node may be driven with a voltage following a sinusoidal waveform.

The invention relates to the technical field of lithium battery packs, in particular to a lithium battery pack structure which comprises a first insulating plate and a plurality of single lithium battery cells arranged on the top of the first insulating plate, the single lithium battery cells are arranged in a honeycomb array, and an assembly space is reserved between every two adjacent single lithium battery cells; a plurality of single lithium cells which are positioned in the honeycomb array and are positioned in the same row are jointly surrounded by a functional bracket, the outer wall of the part, which is designed along the row, of the functional bracket is in a sinusoidal waveform, and a working gap is reserved between the inner wall of the functional bracket and the single lithium cells; a heat dissipation channel is designed between the outer walls of the sinusoidal waveform parts of every two adjacent functional supports, and wave crests and wave troughs of the sinusoidal waveform outer walls of the two adjacent functional supports correspond to each other. Structural supporting and the heat dissipation channels are integrated, protection is enhanced, meanwhile, the heat dissipation efficiency is optimized, a fire extinguishing structure and a pressure relief structure are designed in the safety cavity, and the safety of the safety cavity is improved. And the thermal runaway of the single lithium battery core is effectively treated.

The invention provides an asymmetric magnetic pole permanent magnet motor with low sinusoidal waveform distortion, and belongs to the technical field of automobile motor electric appliances, a magnetic pole on a motor rotor is formed by combining a plurality of pieces of permanent magnet steel and a magnetic isolation air gap, the magnetic isolation air gap guides the direction of a magnetic circuit, and the asymmetric design is adopted in the geometrical shape, the structural size and the magnetic field distribution; the cogging torque and the torque pulsation are remarkably reduced, the operation stability and the output stability are improved, the utilization rate of the magnetic field is improved through cooperation of multiple pieces of permanent magnet steel and magnetism gathering, the air-gap flux density is close to sine distribution, the waveform distortion rate is small, the air-gap flux density harmonic component is effectively restrained, and the stator iron core eddy current loss is reduced; and the motor efficiency and power density are improved.

An inverter circuit includes at least three output terminals, a first input terminal, a second input terminal, and at least three series bodies. A total switching duration and a one-phase fixed duration are present within a single cycle of AC output. The waveform of each phase of an output voltage is such that a shared offset wave is deducted from a sinusoidal waveform. The waveform of the offset wave matches one phase of the sinusoidal waveform, or matches a waveform obtained by shifting the one phase of the sinusoidal waveform in the amplitude direction, during the one-phase fixed duration. During switching between the total switching duration and the one-phase fixed duration, the inclination of the waveform of the offset wave either continuously changes or remains fixed.

The application provides a reactor applied to micro fluidized bed thermal gravimetric analysis and a thermal gravimetric analysis device, which comprises, from bottom to top, a connecting pipe section, a heating pipe section and a reaction pipe section connected in sequence; the lower end of the connecting pipe section is used for being connected with a gas source, and a wind distribution plate is arranged at the connecting position of the connecting pipe section and the heating pipe section; the inner wall of the heating pipe section is in a sine wave structure; a heat conduction plate is arranged in the heating pipe section, and the heat conduction plate is located at a preset position above the wind distribution plate; the upper end of the reaction pipe section is provided with a top cover, and a central through hole is arranged in the top cover; the inner wall of the heating pipe section is arranged in a sine wave structure, the inner wall structure in a sine wave is utilized, the heating area of the fluidized medium is effectively increased, and the heat transfer efficiency is greatly enhanced; the heat conduction plate is additionally arranged in the heating pipe section, the heat conduction performance of the heat conduction plate is utilized, the heat transfer efficiency is improved, the uniformity of temperature distribution in the reactor is promoted, the heating rate of the fluidized medium is further improved, and the accuracy of test results is ensured.

A control system for a multiphase brushless motor without a position sensor, incorporating drive control electronics, comprising: a switching means, provided with two-state switches for varying the electrical voltage applied to each of the phases; a means for detecting overloading of the motor; and a means for determining an operating point, allowing at least two operating points to be applied, the control electronics being arranged to use space vector modulation or vector modulation to generate a sinusoidal waveform from a DC voltage, and the control electronics being arranged to modify the operating point at least once if an overload is detected by the overload detection means.

The invention relates to a short-circuit protection circuit and protection method for an alternating-current solid-state power controller, and belongs to the technical field of power electronics. The circuit can realize a protection function when current in a channel of the AC solid-state power controller is short-circuited. Current in a channel of the alternating-current solid-state power controller periodically changes in a sine wave mode according to power frequency, and a positive period and a negative period exist. The sampling resistor is used for sampling the current in the channel of the AC solid-state power controller, the reference level is designed to ensure that the current signals in the positive / negative period can be normally detected, the comparison circuit is used for carrying out short-circuit judgment on the current and outputting the short-circuit detection result, and the circuit has the advantages of economy and high reliability.

The invention relates to the technical field of heat exchange equipment, in particular to a plate-fin heat exchanger. The plate-fin heat exchanger comprises a plurality of channels which are stacked in the stacking direction, and each channel comprises two plate sheets which are separated from each other and are oppositely arranged in the stacking direction and a plurality of fins which are clamped between the two plate sheets and are separated from each other; the fins are in a sine wave shape, and any two adjacent fins are symmetrically arranged, so that a flow channel formed between every two adjacent fins becomes a variable cross-section flow channel with alternate widths. And fluids in every two adjacent variable cross-section flow channels are isolated. Meanwhile, the variable cross-section flow channels in the adjacent channels in the stacking direction correspond to each other, namely any wide cross-section part of each variable cross-section flow channel in each channel corresponds to the narrow cross-section part of the variable cross-section flow channel of the adjacent channel; and the narrow-section part corresponds to the wide-section part of the variable-section flow channel in the adjacent channel.

The application provides a sequential micro-mixer based on sinusoidal vortex flow, comprising a glass substrate, a PDMS cover plate with a micro-channel arranged on the glass substrate, two 3D electrodes arranged on two sides of the micro-channel respectively, a planar electrode connected with one end of the 3D electrode and connected with an external power supply at the other end, so as to form a uniform electric field in the micro-channel through the 3D electrode, and two suspended electrodes arranged in the micro-channel and asymmetrically arranged along the fluid flow direction of the micro-channel in sequence. The sequential micro-mixer has a high-efficiency and controllable mixing effect.

A heavy-duty, all-gear transmission using helical gears is disclosed as a CVT or IVT completely devoid of any frictional or hydraulic elements. By longitudinally moving the input member of a pair of rotating helical gears, and by varying the direction and extent of any superimposed, longitudinal motion, the rotation of the output member can be varied. When the longitudinal motion is generated with a reciprocating, harmonic mechanism, the speed of the output gear varies in a sinusoidal fashion. This novel mechanism employs the principle of combining two equal outputs with sine wave profiles of opposite phase in a differential to produce an averaged, linear profile. Altering the amplitude of any longitudinal translations results in variations in the final output.

The invention provides a three-phase imbalance few-sensor control method and system based on a controlled impedance source. The method is based on a controlled impedance source model and comprises two links of simulating steady-state resistance control and simulating time-varying impedance control. The analog steady-state resistance control is used for adjusting the average active power of the converter, and zero-static-error tracking of a power instruction is realized by adjusting equivalent resistance parameters; the simulation time-varying impedance control dynamically compensates the secondary active power pulsation of the direct current side caused by the imbalance of the power grid by introducing a double-frequency time-varying impedance component, so that the high-quality sinusoidal waveform of the grid-side current is maintained while the power oscillation is suppressed. Besides, the method only needs to collect the grid-side current of the converter without a power grid voltage sensor and a phase-locked loop, so that the hardware cost is reduced and the system reliability is improved. Meanwhile, the method has excellent robustness for asymmetry of input inductance parameters, and is simple in algorithm structure, low in operation load and suitable for engineering application.

A power generator with partial sinusoidal waveform includes a resonance module circuit and a pulse module circuit. The resonance module circuit includes a plurality of resonance control switches, and generates a first output voltage by selectively turning on and off the plurality of resonance control switches based on a plurality of resonance control signals. The pulse module circuit includes a plurality of pulse control switches, and generates a second output voltage by selectively turning on and off the plurality of pulse control switches based on a plurality of pulse control signals. The power generator generates a bias power based on the plurality of resonance control signals, the plurality of pulse control signals, the first output voltage and the second output voltage. The bias power has a non-sinusoidal voltage waveform during an entire time interval and a sinusoidal voltage waveform during a partial time interval.

The relative positions of a first low-reflection layer and a second low-reflection layer are variable in a bendable portion. A main low-reflection structure has, on a surface facing a secondary low-reflection structure, an asperity pattern and a moth-eye structure. The asperity pattern has a sine-wave shaped surface in a sectional view. A single period of a sine wave constituting the sine-wave shaped surface is equal to an integral multiple of the width of a single pixel of a display device in a direction where the asperity pattern is arranged.

The invention belongs to the technical field of stirring tank heat exchange equipment, and particularly relates to a stirring tank heat exchange device which comprises a wave-shaped heat exchange tube set and a stirring mechanism which are coaxially arranged in a stirring tank. The heat exchange tube set adopts an inner-outer double-ring corrugated tube bundle design, the side, close to the stirring paddle, of the inner-ring tube bundle is a straight tube section to form a flow guide area, the other side and the outer-ring tube bundle are arranged in a sinusoidal waveform, and the phase positions are staggered by 180 degrees. The unique structure enables the flow channel to generate periodical change, the fluid transverse migration and turbulent flow mixing are enhanced through the dynamic fluid pump effect, and a thermal boundary layer is obviously thinned. The device has the advantages of scaling resistance, uniform temperature distribution, modular installation and the like, and is particularly suitable for high-efficiency heat exchange requirements under the working condition of high solid content in the fields of chemical engineering, pharmacy and the like.

The utility model belongs to the technical field of static mixers, and particularly relates to a static mixer device for a water and fertilizer integrated pipeline system, which comprises an irrigation pipeline and a static mixer connected with the irrigation pipeline, the static mixer comprises a shell connected with the irrigation pipeline, a flow channel is arranged in the shell, and a sinusoidal waveform guide plate is arranged in the flow channel. The sinusoidal waveform guide plate is of a spiral torsion structure, and turbulent flow teeth are arranged at wave crests and wave troughs of the sinusoidal waveform guide plate and are arranged at equal intervals in the sine curve direction of the sinusoidal waveform guide plate; according to the static mixing device, through the synergistic effect of the sinusoidal waveform flow guide plate and the turbulent flow teeth, the fluid is subjected to periodic contraction-expansion flow channel and local vortex induction, so that the mixing time is shortened, the flowing intensity and the shearing effect of the fluid are enhanced, and the mixing uniformity of two phases of water and fertilizer is realized; and the asymmetric turbulent flow teeth at the wave crests and the wave troughs can form a local shear stress gradient, so that particle aggregation and deposition are inhibited, and the volume fraction of a dead zone of a runner is reduced.

The utility model provides a composite electrostatic cotton filter material. The composite electrostatic cotton filter material comprises a gradient pre-filtering layer, an electrostatic filtering layer and a reinforcing layer which are arranged in sequence, the static filtering layer is in a sinusoidal waveform, an outer supporting layer is arranged between the gradient pre-filtering layer and the static filtering layer, an inner supporting layer is arranged between the gradient pre-filtering layer and the reinforcing layer, and the side, close to the static filtering layer, of the outer supporting layer and the side, close to the static filtering layer, of the inner supporting layer are in sinusoidal waveforms matched with the static filtering layer; according to the utility model, through the sinusoidal waveform electrostatic filtering layer, the filtering area of the electrostatic filtering layer in the unit filtering material area can be increased, the electrostatic adsorption area can be increased, and the electrostatic adsorption capacity of dust can be improved; the side, close to the electrostatic filtering layer, of the outer supporting layer and the side, close to the electrostatic filtering layer, of the inner supporting layer are both sinusoidal waveforms matched with the electrostatic filtering layer, the outer supporting layer and the inner supporting layer support the electrostatic filtering layer on the two sides of the electrostatic filtering layer, the sinusoidal waveforms are kept, and it is guaranteed that the electrostatic adsorption layer has the stable and large electrostatic adsorption area.

The invention relates to the technical field of electromagnetic vibrators, and discloses an electromagnetic vibrator SPWM (sinusoidal pulse width modulation) control method, which comprises the following steps: S1, building a control system: the control system comprises an MCU (microprogrammed control unit) control module, the MCU control module is connected with a FLASH module and a CPLD (complex programmable logic device) editor, the MCU control module is connected with the CPLD editor through an SPI (serial peripheral interface) module, and the MCU control module is connected with the CPLD editor; the MCU control module is provided with a CAN interface module used for receiving a control instruction and a UART communication module used for outputting information. A closed-loop feedback control mode is adopted, and the defects that the actual amplitude of a vibration tray of the vibrator cannot be judged, the amplitude of the vibration tray of the vibrator cannot be accurately adjusted, and the discharging speed and the yield cannot be judged due to the fact that no feedback exists in open-loop control of a traditional vibrator are overcome. The amplitude of the vibrator can be adjusted, a vibrator tray can be adjusted, and discharging can be accurately controlled; and an SPWM control mode is adopted, so that the current of the vibrator tends to be in a sine wave form, the ascending and descending processes become slow, the jumping phenomenon of materials on the tray is reduced, and the discharging effect is improved.

The invention discloses a double-near-sine gold grating microstructure with photo-thermal heating and fluorescence polarization detection enhancement functions and a preparation method and application thereof, and the double-near-sine gold grating microstructure comprises a substrate and a double-near-sine type gold grating periodic array structure arranged on the substrate in an array mode. The minimum repetitive unit of the double-nearly-sinusoidal gold grating periodic array structure is a double-nearly-sinusoidal gold grating unit, and the double-nearly-sinusoidal gold grating unit comprises two parallel nearly-sinusoidal gold strips with sinusoidal waveform or quasi-sinusoidal waveform and different amplitudes. The double near-sine gold grating microstructure provided by the invention has the advantages of high integration (a heat source and a detection substrate are combined into one, the system structure is greatly simplified, and implementation of a chip laboratory is facilitated), rapidness and high efficiency (the photothermal conversion efficiency is high, the thermal response is fast, and the heating / cooling rate far exceeding that of a traditional PCR instrument), high sensitivity, low cost, low power consumption, good compatibility and the like.

The application discloses a multifunctional integrated multistage doctor blade coating device, which comprises a multistage doctor blade head, a heating vibration source, a vertical connecting rod, a horizontal connecting rod, a liquid supplementing device and a driving block. When the substrate is subjected to doctor blade coating, the multistage doctor blade head can make the doctor coating gap gradually decrease, so that the meniscus height of the front end of the doctor blade gradually decreases, a smaller and more stable liquid surface height difference is formed between the liquid film of the rear end of the doctor blade, the liquid film thickness fluctuation caused by the liquid surface height difference change of the front and rear ends of the doctor blade in the doctor coating process is reduced, and a more uniform ideal thickness photoresist film is obtained. The heating vibration source can realize real-time control of the temperature control of the substrate doctor blade head and the vibration mode state of the doctor blade. By heating the doctor blade head, a high-temperature environment can be formed at the bottom region of the doctor blade, the viscosity of a high-viscosity solution is reduced, and the solution is uniformly spread under the doctor blade. By controlling the vibration mode of the vibrator inside the heating vibration source, the bottom of the doctor blade can realize complex motion trajectories such as sinusoidal waveforms.

The utility model discloses a kind of damping enamel steel plate structures, including damping core layer, damping core layer includes intermediate rubber pad and the metal grid plate of bonding in the front and rear sides of intermediate rubber pad, intermediate rubber pad has honeycomb hole;Transition steel plate is respectively fixed on the front and rear surfaces of damping core layer;Waveform substrate is respectively welded on the surface of transition steel plate, waveform substrate has the wave part located in the center and the edge part located in four periphery, waveform part is set as sine wave, has wave crest and wave trough, transition steel plate is welded in wave trough, edge part is mutually welded by aluminum beam, multiple assembly holes are provided on aluminum beam;Polyurethane lining is filled between transition steel plate and wave crest;Wherein, waveform substrate surface is sprayed with enamel layer.The utility model is combined by the intermediate rubber pad of damping core layer and metal grid plate, cooperate the sine wave design of waveform substrate, can efficiently absorb vibration energy;Polyurethane lining filling enhances the structural integrity, auxiliary promotes damping effect.

The invention discloses a shutter type radiator of an asymmetric sine wave microchannel and a radiating method thereof, and relates to the field of radiators, the radiator comprises a plurality of fin units, each fin unit comprises two asymmetric sine wave surfaces arranged oppositely, a top surface connected with the two asymmetric sine wave surfaces and a fin group, the asymmetric sine wave surface is provided with a concave part, the fin group comprises a plurality of inclined fins, windows are formed in the positions, corresponding to the inclined fins, of the asymmetric sine wave surface, and boss groups are distributed on the surfaces of the inclined fins. When a heat dissipation fluid medium enters a channel between the two asymmetric sine wave surfaces, the heat dissipation fluid medium firstly flows through the sunken part to increase the contact area of the fluid, then flows through the window and the inclined fins to further change the flow direction of the fluid, breaks continuous formation of a thermal boundary layer on the asymmetric sine wave surfaces, and then flows through the boss groups of the inclined fins to further change the flow direction of the fluid. And the thickness of the thermal boundary layer on the wave surface is greatly reduced, so that the heat dissipation effect of the fin unit is enhanced.