131 results about "VMOS" patented technology

This invention relates to a piezoelectric ceramics driver circuit used for regulating optical fiber stress. It is composed of three parts: Part 1, the voltage amplifier stage circuit, comprising: a constant-current source circuit composed of triode Q1 and resistances R1, R2 and R3; a feedback comparator composed of R4, R5 and R6, and Q2, Q3; and a regulating tube Q4; Part 2, the power amplifier stage circuit, comprising: a selected high power and high voltage-resisting N-channel VMOS tube IRF830 substituted for the existing complementary symmetric circuit; and Part 3, the discharging 100p circuit, comprising: diodes D1, D2 and triode Q5 and a comparator. This invention has advantages of: simple structure, low energy consumption, small volume, stable working, safety, excellent dynamic response to non-regulated signals, quick response, wide response frequency range.

The invention discloses an analysis method for evaluating service life and reliability of a power VMOS (Vertical Metal Oxide Semiconductor) tube, which comprises the following four steps: step 1. creating a model for the power VMOS tube, and creating an H bridge artificial circuit; step 2. performing non-failure emulation on the H bridge; step 3. performing degradation emulation on the threshold voltage of the H bridge circuit; and step 4. comprehensively analyzing to obtain a conclusion in actual application. The analysis method disclosed by the invention emulates the common H bridge drive circuit of the power VMOS tube in actual application, analyzes the degradation drift of the threshold value, and analyzes and calculates on the parameters of the power VMOS tube through a mathematical principle to obtain the conclusion. The analysis method has a scientific conception and a novel method. The analysis method has good application value and brilliant application prospect in the technical field of security tests of power semiconductor components.

The invention provides a permanent magnet brushless direct current frequency conversion axial flow fan. The permanent magnet brushless direct current frequency conversion axial flow fan comprises a fan frame, an impeller, a cover disk, a coil, a rotor iron core body, permanent magnets, a stator iron core body, a PCB and a heat dissipation frame. The permanent magnet brushless direct current frequency conversion axial flow fan is characterized in that the heat dissipation frame is made of an aluminum alloy material; the PCB is a round printed board of which the center is provided with a hole; a dual-core single chip microcomputer, a front driving chip and a VMOS power pipe are welded to the PCB, and the heat dissipation surface of the PCB is fixed to a hexagonal frame at the center of the heat dissipation frame through screws in a horizontal installation mode; the cover disk is a hollow cylinder of which the middle is provided with an isolation plate; the center of the isolation plate is provided with a bearing B installation step; and the isolation plate divides the cover disk into two parts. The fan and motor integrated permanent magnet brushless direct current frequency conversion axial flow fan scheme provided by the invention represents the development direction of permanent magnet brushless direct current frequency conversion axial flow fans and is quite broad in application prospect.

An energy-saving control method for the electromagnetic clutch of electric boosted steering mechanism features that a single-chip microprocessor in said steering mechanism is used to determine the torque to be tansferred by electromagnetic clutch according to external signals and the current needed by it. According to said current, a PWM drive signal is output and amplified to control high-power VMOS transistor, so controlling the current of electromagnetic clutch.

The invention relates to a topology circuit of a wide-range input voltage isolation type switch power supply and a control method of the topology circuit. The topology circuit comprises push-pull circuit, a rectifying and filter circuit and a synchronous rectifying BUCK circuit, wherein the push-pull circuit comprises a transformer and VMOS tubes; two ends of the primary winding of the transformer are respectively connected with the drains of the first VMOS tube and the second VMOS tube, the central contact of the primary winding of the transformer is externally connected with a power supply input loop, the grids of the first VMOS tube and the second VMOS tube are connected with the control circuit of the switch power supply, the sources of the first VMOS tube and the second VMOS tube are grounded, and two ends of the secondary winding of the transformer are respectively connected with the synchronous rectifying tube and the output public end of the synchronous rectifying BUCK circuit through the rectifying and filter circuit. The topology circuit has the advantages that isolation and efficient features of push-pull topology are utilized, isolation pre-stabilization of the wide-range input voltage is achieved, the design of a multi-path low-voltage-output circuit is simplified, overall circuit efficiency is increased, and size is reduced.

The invention relates to an LLC (inductor-inductor-capacitance) resonant DC-DC (Direct Current-Direct Current) power supply capable of changing resonance frequency by changing capacitance. The LLC resonant DC-DC power supply comprises an input circuit, an electronic switch, an LLC resonant circuit, a high-frequency transformer circuit and an output circuit; the LLC resonant circuit comprises a first inductance coil, a first capacitor and a second inductance coil, as well as a voltage/current sensor circuit and a programmable single chip computer; the voltage/current sensor circuit comprises a voltage sensor and a current sensor; the LLC resonant circuit also comprises a second VMOS (Vertical Metal Oxide Semiconductor) tube and a second capacitor; and the second VMOS tube and the second capacitor are serially connected and then connected on two ends of the first capacitor in parallel. Through the invention, the technical problem of incapability of the adjustment of resonance frequency according to the change of a load of the power supply in the traditional power supply for a vehicle is solved. Through the invention, the system is provided with two resonance points, then the power supply can work under different resonance frequencies in different loads and the frequency of the system during the adjustment deviates a little from the resonance points, so that the work efficiency of the DC-DC power supply is improved.

The invention provides a permanent magnet brushless direct current motor digital speed regulator. The permanent magnet brushless direct current motor digital speed regulator comprises an upper shell end cover, a middle frame, a lower shell end cover, a rotating speed indicating dial plate, a pointer, a PCB, a three-core single-chip microcomputer, a signal conditioning chip, a VMOS transistor drive chip, a VMOS transistor and a micro-stepping motor. The permanent magnet brushless direct current motor digital speed regulator is characterized in that a steering button, a stop button, a steering indicating light-emitting diode, a stopping indicating light-emitting diode, a speed regulating rotary knob and a speed regulating dial are mounted on the upper shell end cover; rotating speed numerical scales are carved in the rotating speed indicating dial plate, the middle frame is made of aluminum alloy and composed of a middle frame hollow cylinder and a middle frame cylinder hexahedron, and the middle frame hollow cylinder and the middle frame cylinder hexahedron are combined through six connecting lugs; the upper shell end cover and the lower shell cover are connected with the middle frame cylinder, a rotary shaft of the micro-stepping motor is externally connected with the pointer, and under control of the three-core single-chip microcomputer, the position, on the rotating speed numerical scales, of the pointer is the current rotating speed of a permanent magnet brushless direct current motor.

The invention relates to a self-excitation driving follow current control device which belongs to the technical field of DC power control. The device comprises a self-excitation oscillating circuit, arectification filtering circuit, a driving circuit and a VMOS switching circuit, wherein the self-excitation oscillating circuit mainly comprises a triode and an oscillating coil and is used for enhancing inputted low voltage to required high-frequency pulse voltage to output; the rectification filtering circuit mainly comprises a rectification diode and a filtering capacitor and is used for converting the inputted high-frequency pulse voltage into working voltage; the driving circuit mainly comprises a timer and a charging and discharging circuit and is used for outputting the inputted working voltage in definite time to driving control voltage with time intervals for driving a secondary circuit; and the VMOS switching circuit mainly comprises a VMOS device connected with a follow current diode in parallel and is used for switching assistant follow current according to preset time intervals under the drive of the inputted driving control voltage. The device can ensure that the powersupply of a battery pack is recovered when an individual battery fails, effectively prevent the follow current diode from being overheated simultaneously and prevent other batteries of the battery pack from being damaged.

The invention discloses a module type permanent magnet brushless direct-current motor. The module type permanent magnet brushless direct-current motor consists of a motor module and a controller module, and has the following key points: a motor shell (2) is a circular column which is externally octagonal and internally hollow; through combining the motor shell (2) with a separation plate, components such as a rotation shaft, a wire bag, a stator core body, a rotor core body, a bracket and a neodymium-iron-boron permanent magnet required by the permanent magnet brushless direct-current motor are packaged; a controller shell is combined with an end cover to package components such as a PCB board, a VMOS power tube, a dual-core single chip and a driving chip required by a controller; and the motor shell and the controller shell are integrally connected through a fastening bolt. The invention provides a module solution which is low in cost and is capable of carrying out large-scale production and realizing integration of the permanent magnet brushless direct-current motor and the controller, and the module solution is broad in market prospect.

The invention provides a video quality evaluation method and device; the method comprises the following steps: acquiring multiple evaluation parameters of a to-be-evaluated video; calculating according to the evaluation parameters and obtaining a corresponding influence factor; and obtaining an evaluation value according to the influence factor and displaying the evaluation value. According to thevideo quality evaluation method and device provided by the embodiment of the invention, multiple evaluation parameters of the to-be-evaluated video are obtained, the corresponding influence factor isobtained according to the multiple evaluation parameters, and then the evaluation value is obtained and displayed according to the influence factor, so that manual participation is not needed, original video contrast reference is not needed, and extra transmission bandwidth is not needed; only a single terminal is required to obtain less reference data, so that the calculation amount is reduced,and the VMOS value can be quickly and reasonably calculated; meanwhile, the evaluation method and device are not only suitable for video services and also applicable to multimedia service evaluation carried by other LTE and RTP protocols.

The present invention provides a method for manufacturing a trench type VMOS transistor, comprising: providing a semiconductor substrate formed with an epitaxial layer, the epitaxial layer has a trench in it, and a gate is formed in the trench, located on both sides of the gate A source electrode is formed in the epitaxial layer on the side; an interlayer dielectric layer covering the gate is formed above the epitaxial layer, a contact hole is formed in the interlayer dielectric layer and the epitaxial layer, and the contact hole is adjacent to the source electrode ; Forming a metal interconnection layer on the interlayer dielectric layer, and the metal interconnection layer is filled with contact holes; Before the formation of the metal interconnection layer, including the step of: utilizing the method of chemical vapor deposition on the interlayer dielectric The first metal layer is formed on the sidewall and bottom of the contact hole; the second metal layer is formed on the first metal layer by physical vapor deposition, and the second metal layer and the first metal layer constitute the barrier metal layer. The method effectively prevents metal aluminum from entering into the epitaxial layer, and eliminates the defect of aluminum puncture.

The electronic turning warning squealer flash for automobile as one automobile turning device includes one turning switch and one display lamp combination, as well as one timer, one VMOS switch and one squealer. The present invention has the outstanding features of no circuit contact, no relay, full electronic implementation, high system reliability, specific electronic circuit to generate timing signal, capacity of simulating sound of relay, automatic restoring short-circuit protector, and capacity suitable for different kinds of vehicular power source.

A DC power amplifier of vehicle electronic device interference simulator consists of multistage amplification circuit including the first stage of operational amplification, the second stage of operational amplifier, the third stage of operational amplification and fourth stage of amplification; protective circuit being a VMOS grid double protection circuit; power output amplification circuit being power output amplification stage for outputting power up to 1500 watt.

A power supply converting circuit capable of supporting various input waveforms comprises an input current sampling circuit and an output current sampling circuit, wherein the input end of the input current sampling circuit is connected with the output end of an input power supply; the input end of the output current sampling circuit is connected with the input end of a load; and the output ends of the input current sampling circuit and the output current sampling circuit are both connected with the input end of a VMOS (V-Groove Metal Oxide Semiconductor) converting circuit sequentially through a width modulation type pulse control circuit, a driving signal synthesis circuit and a VMOS switch driving circuit. And the power supply converting circuit capable of supporting various input waveforms has the advantages of XC (Capacitive Reactance)/DC (Direct Current) expansion (XC) form, non-polarity, multiple waveforms and wide frequency power supply input, DC output, automatic polarity identification and orientation, high conversion efficiency, high power factor, high reliability, high power density, low cost and the like.

The invention provides a high-efficiency output power supply adaption circuit for an LED chip, which mainly solves the problems of high power consumption, low efficiency and poor reliability of a low-voltage new-energy power converter. The output end of an output power supply of the high-efficiency output power supply adaption circuit for the LED chip is respectively connected with the input end of a flow current inductor and the input end of an input current sampling circuit, the output end of the flow current inductor is connected with the input end of an VMOS (V-groove metal oxide semiconductor) switch circuit, the input end of the VMOS switch circuit is further connected with the output end of a control circuit, and the output end of the VMOS switch circuit is connected with a load through a reverse isolation circuit, an energy storage filter circuit and an output protection circuit sequentially. The high-efficiency output power supply adaption circuit for the LED chip can more efficiently and reliably provide power to the LED chip at a low cost, and has no requirement on the form of low-voltage input voltage; the added output protection circuit can guarantee current-limited output of the LED chip in accidental short circuit during the work of the LED chip, and meanwhile, low power consumption can also be guaranteed.

The embodiment of the invention provides an underground energy converter exciting circuit and a work method of the underground energy converter exciting circuit. The circuit comprises a pulse transformer, a VMOS (V groove metal oxide semiconductor) array, an excitation driving circuit and a logic controller, wherein the logic controller is used for generating control logic signals, the excitation driving circuit is used for generating excitation control signals used for controlling the order on-off state of the VMOS array according to the control logic signals, and the VMOS array is used for controlling the high-voltage isolation of the non-excitation side and the conduction and current continuation of the primary coil excitation side in the pulse transformer through the order on-off operation under the control of the excitation control signals, so positive or negative excitation pulses are generated at the output level of the pulse transformer and are then sent to the energy converter. After the circuit is used, the positive and negative power excitation of a plurality of sound wave bending vibrator energy converters can be realized, the monopole excitation, the orthogonal dipole excitation and the quadripole excitation can be realized in the petroleum well logging construction, the number of the energy converters is reduced, the length of instruments is shortened, and the work reliability of the instruments is improved.

The invention discloses an electronic remote pulse-type fishing device. The electronic remote pulse-type fishing device comprises a low-frequency multivibrator circuit, a high-frequency multivibrator circuit and a high-voltage generator circuit, wherein the low-frequency multivibrator circuit consists of a time base circuit IC1 inside a double time base integrated circuit IC, as well as resistors R1, R2, capacitors C1, C2, a light-emitting diode VL1 and potentiometers RP1, RP2; the high-frequency multivibrator circuit consists of a time base circuit IC2, resistors R3, R4, R6, a light-emitting diode VL2, potentiometers RP3, RP4 and capacitors C3 and C4; and the high-voltage generator circuit consists of VMOS field effect transistors VF1, VF2, resistors R7-R11, a voltage stabilizing diode VS and a boosting transformer T. According to the electronic remote pulse-type fishing device, electric shocks can be utilized for fishing, so that the fishing efficiency is improved; and the electronic remote pulse-type fishing device has the advantages that the circuit structure is simple, the performance is stable and the service life is relatively long.

The invention provides a high-performance VMOS switching control circuit which mainly solves the problems that an existing low-voltage new energy power converter is high in power consumption, low in efficiency and poor in reliability. An output current sampling circuit of the high-performance VMOS switching control circuit comprises a current sensor CS2, a capacitor C9 and a diode D5. The current sensor CS2 is connected with the diode D5 in series so that a branch circuit can be formed. The capacitor C9 is connected with the branch circuit in parallel. A reverse isolation circuit is composed of a VMOS transistor set which is synchronously rectified through a VMOS switching circuit and synchronously driven by a drive signal synthetic circuit through a follow current drive circuit. A capacitor is adopted in an energy storage filter circuit. The plus end of the capacitor is connected with the plus end of a load and the minus end of the capacitor is connected with the minus end of the load.

The invention discloses a high-power negative pressure numerical control constant current module, comprising a D/A (Digital/Analog) conversion chip, a photoelectronic isolator, an operational amplifier, a feedback unit and a VMOS (Vertical Metal Oxide Semiconductor) field effect transistor. An input digital signal is sequentially converted by the D/A conversion chip and the photoelectronic isolator and is then input to the positive phase terminal of the operational amplifier, the feedback unit feeds the grid voltage and the source voltage of the VMOS field effect transistor back to the negative phase terminal of the operational amplifier, and the operational amplifier outputs a control signal to the grid of the VMOS field effect transistor after comparison operation so as to control the drain of the VMOS field effect transistor to output a constant current. In the module provided by the invention, under the condition that the resolution of the input digital signal is 10 bits, an output current is varied in 1024 levels in the current range of 0-3A and the input control range of 0-1024 level digital signal, the initial voltage is more than or equal to minus 0.5V, the current stability is 9.9*10<-5>, the current temperature coefficient is 4.8*10<-5>, and the maximum power consumption is 30W.

The invention provides a multi-waveform input adaptive power converter with output protection and mainly solves the problems of high power consumption, low efficiency and poor reliability of the existing low-voltage new energy power converter. The power converter comprises a V groove metal oxide semiconductor (VMOS) switching circuit and a width modulation type pulse control circuit, wherein the input end of the VMOS switching circuit is connected with the output end of an input power through a freewheeling inductor, and the output end of the VMOS switching circuit is connected with a load through a reverse isolation circuit, an energy storage filter circuit and an output protection circuit; the width modulation type pulse control circuit, a drive signal combination circuit, the VMOS switching circuit and a freewheeling voltage sampling circuit constitute a control circuit; and the output protection circuit is further arranged in front of the load. The power converter can achieve stable output without distinction on multi-waveform of alternate current and direct current.

The invention discloses an integrated BLDC control assembly. The integrated BLDC control assembly comprises a base (1), an upper shield (2) and a direct current circuit breaker (7). A control assembly socket (3) and a plurality of binding posts are arranged on the upper surface of the upper shield (2), fins (5) are vertically and symmetrically arranged on the left side and the right side of the upper surface of the base (1), and the fins (5) and the base (1) are of an integrated aluminum profile structure. The direct current circuit breaker (7) and a PCB (8) are arranged between the fins (5) on the left side and the right side of the upper surface of the base. A plurality of VMOS power tube sets (9) are arranged on the side face, close to the fins (5), above the PCB (8), and pins of the VMOS power tube sets (9) are connected with the PCB (8) placed at the bottom of the base (1). Fuses (4) are arranged between the binding posts with the same polarity of the upper shield (2) and the direct current circuit breaker (7). According to the integrated BLDC control assembly, the fuses and the direct current circuit breaker are integrated, the fins, mounting ribs and the base are made to be of an integrated aluminum profile structure, a radiating effect is improved by more than 50%, and a dust poof and water proof function is excellent.

The invention provides a power-switching circuit capable of reducing circuit losses. The power-switching circuit mainly solves the problems that an existing low-voltage new energy power converter is high in power consumption, low in efficiency and poor in reliability. The input end of a VMOS switching circuit of the power-switching circuit capable of reducing the circuit losses is further connected with the output end of an input power supply through a freewheeling inductor, and the output end of the VMOS switching circuit is connected with a load sequentially through a reverse isolation circuit and an energy storage filter circuit; the output end of the VMOS switching circuit is further connected with the input end of a driving signal synthesis circuit through a freewheeling voltage sampling circuit; a control circuit is formed by a width modulation pulse control circuit, the driving signal synthesis circuit, a VMOS switching driving circuit and the freewheeling voltage sampling circuit.

The invention provides a highly-stable wideband input power change-over circuit which mainly solves the problems that an existing low-voltage new energy power converter is high in power consumption, low in efficiency and poor in reliability. The highly-stable wideband input power change-over circuit comprises a VMOS switching circuit, a width modulation pulse control circuit and an output protection circuit. The input end of the VMOS switching circuit is connected with the output end of an input power source through a follow current inductor and the output end of the VMOS switching circuit is connected with a load through a reverse isolation circuit and an energy storage filter circuit in sequence. The input end of the VMOS switching circuit is further connected with the output end of a VMOS switching drive circuit. An input current sampling circuit comprises a current sensor CS1, a capacitor C13, a resistor R21 and a diode D4. The output protection circuit can guarantee that BOOST output can be automatically adjusted when the load is in a short circuit, output current is limited, and meanwhile low power consumption is guaranteed.