44results about How to "Stable working frequency" patented technology

The invention discloses an induction type wireless electric energy transmission system capable of outputting constant current and constant voltage. The system is composed of a transmitting part and a receiving part. A constant-current and constant-voltage switching circuit (I) of the transmitting part is characterized in that a primary constant-voltage capacitor (CPv) is serially connected between a high-frequency inverter (H) and a primary coil (LP); after an additional parallel capacitor (CPp) is serially connected with a first switch (S1), an assembly which is composed of the additional parallel capacitor and the first switch is parallelly connected with a primary constant-voltage capacitor (CPv); the control end of the first switch (S1) is connected with a first controller (K1); or a primary constant-current capacitor (CPi) and an additional serial capacitor (CPs) are successively connected serially between the high-frequency inverter (H) and the primary coil (LP); a second switch (S2) is parallelly connected with the additional serial capacitor (CPs); and furthermore the control end of the second switch (S2) is connected with a second controller (K2). The induction type wireless electric energy transmission system can output constant current and constant voltage and furthermore has advantages of convenient control, high system operation stability, simple structure and low manufacture cost.

The invention discloses a synchronization control method for an electromagnetic oven and a circuit thereof. The circuit includes a rectification filter circuit, a resonance circuit, a switch device, a drive circuit, a synchronizing signal circuit and a MCU control unit. The synchronization control method is: a synchronizing signal circuit detects the resonance voltage of a resonance circuit; when the resonance voltage decreases to a set value, the synchronizing signal circuit generates a synchronizing interrupt pulse signal; the MCU control unit detects the synchronizing interrupt pulse signal and outputs a high level continuity signal with specific width to a drive circuit, which controls the conduction of the switch device; after the high level continuity signal finishes, the switch device intercepts and the resonance circuit generates a resonance; and repeats the process. The invention adopts the MCU control unit to output the high level continuity signal to the drive circuit, in order to directly control the conduction and interception of the switch device, exerts the advantage of MCU stable working frequency and improves the synchronization course precision, with the advantages of simple circuit, convenient debugging and low cost.

The invention discloses an inductive wireless charging system capable of changing the secondary structure and parameters. According to the invention, a constant-current constant-voltage switching circuit I and a constant-current constant-voltage switching circuit II are arranged in a receiving portion, a secondary constant-voltage compensation capacitor is connected with a change-over switch I in series, and a control end of the change-over switch I is connected with a controller I; the constant-current constant-voltage switching circuit II is formed by connecting a secondary constant-current compensation capacitor and a change-over switch II in series, and a control end of the change-over switch II is connected with the controller I. The invention further discloses a second implementation scheme which is slight different from the scheme at the control end. The inductive wireless charging system with the structure disclosed by the invention not only can output constant current, but also can output constant voltage, thereby being applicable to charging a battery, especially being applicable to charging multiple loads under a single power supply; The inductive wireless charging system is convenient to control, stable in operation, simple in structure, low in requirement for the capacity of an inverter and low in manufacturing cost, the input impedance is purely resistive in the whole process, input of reactive power can be avoided, and the system efficiency can be improved.

A receiver includes wavelength demultiplexer for demultiplexing a received WDM light into light signals at respective central frequencies thereof, delay interferometer for converting a light signal output from wavelength demultiplexer into an intensity signal, and light detector for converting an output signal from delay interferometer into an electric signal. The interval between interferential frequencies of delay interferometer is 2/(2n+1) times the interval between the central frequencies of the WDM light. Logic inverting circuit outputs the output signal from the light detector while non-inverting or inverting the logic level thereof depending on the received central frequency.

The invention provides an inductor substrate isolation structure of an integrated circuit. The inductor substrate isolation structure comprises a p-type substrate, an n-type well region formed in the p-type substrate and including a plurality of n wells, a plurality of p-type active regions formed in the plurality of n wells through injection, a polycrystalline silicon shielding layer covering the n-type well region and including a plurality of strips of n-type polycrystalline silicon, a metal layer covering the polycrystalline silicon shielding layer, and an inductor covering the metal layer, wherein each strip of n-type polycrystalline silicon covers two adjacent n wells, the plurality of strips of n-type polycrystalline silicon are spaced from each other by the p-type active regions, the metal layer is of an X-shaped metal structure which is arranged in the diagonal position of the n-type well region, and the center point of the inductor coincides with the center point of the X-shaped metal structure. By adopting the inductor substrate isolation structure of the invention, the electromagnetic loss of the inductor to the substrate can be effectively reduced, the coupling capacitance between the inductor, the shielding layer and the substrate can be reduced, and the quality factor and working frequency of the inductor can be improved.

The invention relates to a composite application shield sheet of a coil module and a preparation process thereof. The preparation process comprises, at least, the following process steps of heat treatment, composite lamination and soft magnetic material surface graphical processing. magnetic sheets formed by a resin bonding agent and a magnetic powder mixture are attached to the back of a first magnetic conductive layer formed by soft magnetic material strip laminations undergoing graphical processing or upper-single-layer graphical processing to form a second magnetic conductive layer; then cooling fins are attached to finally form the shield sheet, and finally the coil module is formed through shaped attachment. The process is simple and feasible, the integrated automation degree is high, the made shield sheet is small in thickness, good in shield capability, high in charging efficiency, small in temperature rise and more suitable for NFC composite functional module coils, the magnetic parameters of the materials are controllable, the surface processing shape of the shield sheet is uniform, the product stability is improved, and the processes and material costs are greatly saved.

The invention discloses a triaxial decoupling self-zero-setting fluxgate magnetometer zero point measurement circuit, and the circuit employs a bipolar intermittent pulse excitation unit composed of low-power-consumption temperature control crystal oscillator to carry out the excitation of an iron core. The circuit employs the temperature control crystal oscillator to stabilize the work frequency, enables the iron core to be demagnetized in real time in a mode of bipolar excitation, and employs an intermittent pulse voltage excitation waveform to greatly reduce the power consumption. The circuit controls a constant voltage source to carry out the excitation of the iron core through a low-resistance switch, and greatly improves the energy utilization efficiency of the excitation unit. The circuit provided by the invention employs a weak coupling mode to install a triaxial magnetic probe, reduces the triaxial coupling error through the optimization of the relative position of the triaxial magnetic probe, employs a zero point automatic measurement circuit, can carry out the programming control to achieve the online detection of a circuit zero point, and can be used in the fields of magnetic field measurement and magnetic object detection.

The invention relates to the technical field of a magnetron, in particular to a magnetron anode assembly and a magnetron provided with the magnetron anode assembly. A magnetron anode blade assembly provided by the invention comprises an anode tube and a plurality of anode blades arranged in the anode tube, wherein at least one flow guide groove is formed in each anode blade; the at least one flow guide groove is used for guiding molten welding materials positioned on the upper surface of the anode blades to one end, welded with the inner wall of the anode tube, of the anode blades, so that during the welding of the anode blades and the anode tube, the welding materials are molten on the upper surfaces of the anode blades; then, the molten welding materials flow to the welding position of the anode blades and the inner wall of the anode tube under the capillary effect and the gravity effect through the flow guide groove; the problem of welding failure of the anode blades and the anode tube due to the gathering of the welding materials on the upper surface of the anode blades can be avoided, so that the work frequency of the magnetron is more stable; the welding quality of the anode blades and the anode tube is higher; the welding success rate is improved; the manufacturing cost is reduced.

A method for controlling freezing capacity of a variable-frequency freezing AC ice-water system separates the freezing capacity of each individual requirement end so as to reduce sudden or peak concentrating freezing demand and relieve variable-frequency load demand, and defines operating procedures corresponding to different requirement ends, respectively, wherein each of the operating procedures has a corresponding high-low temperature range that can be used as a temperature buffer zone so as to redistribute supply of the freezing capacity to each requirement end, thereby allowing the compressors thereof to operate smoothly and thus achieve energy saving as a result. The drawbacks of damaged pipelines are overcome that cause deficiency in freezing capacity as encountered in prior techniques.

The invention discloses a bulk acoustic wave filtering device, a forming method thereof, a radio frequency front end and a communication device. The bulk acoustic wave filtering device comprises an unpackaged bulk acoustic wave resonance device, a connecting part and a circuit board, the first end of the connecting part is connected with the unpackaged bulk acoustic wave resonance device, and the second end of the connecting part is connected with the circuit board; the unpackaged bulk acoustic wave resonance device comprises a piezoelectric layer which comprises a first side and a second side opposite to the first side in the vertical direction; the first electrode layer is located on the first side; the second electrode layer is located on the second side; the first passivation layer is located on the first side and covers the first electrode layer, and the material of the first passivation layer comprises oxide or nitride; the second passivation layer is located on the second side and covers the second electrode layer; the cavity is located on the first side, and at least one end of the first electrode layer is located in the cavity or the first electrode layer covers the cavity; the connecting part is connected with the first electrode layer or the second electrode layer. The working frequency of the filtering device is stable, the resonator is not packaged, and the packaging cost is reduced.

The locked phase active power current control circuit is composed of a DC source, an electronic switch, a driving transformer, a phase detecting unit, a current intercepting unit and a square wave controller. A DC signal provided by the DC source is converted into a square wave signal by the electronic switch for the driving transformer to operate a load. The electronic switch outputs the square wave signal to the phase detecting unit whereat a phase signal of the square wave is detected and the detected signal is transmitted to the current intercepting unit whereat the detected signal is compared with the current intercepted at the electronic switch, the driving transformer, or the load, and the comparison result is fed back to the square wave controller so as to set the operation frequency of the electronic switch. The essential principle of the present invention is based on the fact that the square wave is in phase with the first harmonic wave.

The invention discloses a constant-current constant-voltage wireless charging system based on topology switching, and belongs to the field of wireless charging. A switch switching part is disposed ina transmitting part or a receiving part, so that the system can switch between a constant-voltage characteristic and a constant-current characteristic, and is suitable for charging a battery. The switch switching part only has one AC switch and two additional inductors, thereby achieving a small number of components. The equivalent input impedance of the system is pure resistance in both constant-voltage and constant-current modes, namely, the switching device of a high-frequency inverter can work in a zero-phase switching mode in both constant-voltage and constant-current modes, which can effectively reduce the reactive power loss in the system.

The invention relates to an ignition circuit of a separately-excited arc lighter. The ignition circuit comprises a direct-current power supply, a square wave generating circuit, a first driving and voltage boosting circuit and a first discharging needle, wherein the first driving and voltage boosting circuit comprises a power switch tube and a high-voltage transformer, a winding of the high-voltage transformer consists of a low-voltage winding and a high-voltage winding, and the power switch tube and the low-voltage winding in the high-voltage transformer are connected in series and then are connected to the two ends of the direct-current power supply; the first discharging needle is connected with the output end of the high-voltage winding, and a first driving branch is connected between the output end of the square wave generating circuit and the control end of the power switch tube; the power switch tube is disconnected and connected under the control of the output of the square wave generating circuit through the first driving branch, so that the current on the low-voltage winding is controlled. Due to the adoption of the separately excited driving mode, the ignition circuit is stable in work frequency, low in noise, large in instant starting power, easy to realize arc striking and reliable in work. Besides, the winding of the high-voltage transformer only consists of the low-voltage winding and the high-voltage winding, so that the production cost and the defective rate of the high-voltage transformer are reduced, and massive production is facilitated.

The invention discloses a reverse current device circuit to inhibit power conducted interference. Wherein, receiving output signal from power input circuit, outputting operating frequency; using a drive unit to receive said frequency and cut signal and output drive signal; using a transformation unit to receive said drive signal and take power conversion to drive first load action; arranging an isolation unit between drive and control units to divide grounding type of drive unit and control unit as non-share grounding with first and secondary sides of transformation unit. Thereby, the control unit outputs stable operating frequency and realize inhibiting effect.

The invention relates to a complementary symmetrical self-excited push-pull converter. The converter comprises a direct-current power supply V1, a capacitor C1, a resistor R1, a resistor R2, an NPN transistor Q1, an NPN transistor Q2, a resistor R3, a resistor R4, a capacitor C2, a capacitor C3, an NPN transistor Q3, an NPN transistor Q4, a high-frequency transformer T and a filter inductor Lf. The complementary symmetrical self-excitation push-pull converter disclosed by the invention has the following beneficial effects: 1, the consistency of products produced in batches is good, and the influence of high-frequency inductance is small; 2, the working frequency of the switching tube is stable; 3, the self-oscillation frequency can be designed to be relatively high, and correspondingly, the size of the high-frequency transformer is reduced, so that the cost is reduced; and 4, due to the driving of the independent self-excited oscillation circuit, the working power of the switching tubecan be selected to be greater.

The present disclosure relates to a load control system and a load control method. The load control system includes a load monitoring device, an automatic reading device, and a control device. The load monitoring device is configured to monitor the load power generated by the load according to the power generation amount of a power grid and the grid frequency, and the grid frequency is changed tothe grid change frequency according to the change of the grid power generation amount and the load power. The automatic reading device is configured to read the grid change frequency. The control device is configured to increase or decrease the load power according to a difference between an allowable frequency range and the grid change frequency to reduce the difference.

Operating together one or more strobe units turned on by stepping selection and conversion device, making operation of power supply change over undertaken by conversion device become stable relatively so as to make operation frequency of power supply change over system become stable. Thus, designing relevant circuits is easier than before.