40results about How to "Good EMI effect" patented technology

An electrical connector (100) includes an insulative housing (1), a number of contact terminals (2), a metal plate (3), and a metallic shell (4) enclosing the insulative housing (1). The terminals and the metal plate (3) are retained in the insulative housing (1). The insulative housing (1) includes a base portion (11) and a tongue portion (12) extending forward from the base portion (11). The contact terminal includes a contacting portion (21), a tail (22), and a connecting portion (23) connecting the contacting portion (21) and the tail (22). The tails (22) are positioned out of the insulative housing (1). The metal plate (3) has a number of positioning end portions (33). The positioning end portions (33) are soldered on a printed circuit board for grounding. The electrical connector (100) has improved electromagnetic interference effect.

The invention provides an inductor manufacturing method. The method includes the following steps that first, an enameled wire coil is wound; second, first ferromagnetic powder is pressed into a magnetic core; third, the magnetic core is installed in a hollow cavity of the coil; fourth, the coil is installed in an injection mold; fifth, second ferromagnetic powder and high-temperature resin are evenly stirred and mixed power can be obtained; sixth, the mixed powder is injected into the injection mold and formed so that an outer magnet can be obtained, and it is guaranteed that the density of the outer magnet is smaller than that of the magnetic core; seventh, cooling and demolding are performed so that an inductor can be obtained. The inductor manufactured according to the scheme has the advantages that the inductor is good in thermal conductivity and long in service life; the density of the magnetic core is different from that of the outer magnet, a totally-sealed magnetic shielding structure is achieved as a whole, and the EMI effect of the inductor is better compared with that of an existing integrally formed inductor; the problem that a coil is damaged by mechanical stress in the original integrally formed inductor is solved, and in other words, the insulating capacity of the original coil is not weakened.

The invention discloses a bridgeless three-rectifier boost power supply circuit, includes three rectifying circuits, two Boost capacitors, energy storage capacitors, two Boost conversion circuits andfeedback control driving unit. The three rectifying circuits rectify and charge the energy storage capacitors, and charge the two Boost capacitors respectively when the input voltage is positive and negative. When the input voltage is positive or negative, the double Boost converter alternately charges the storage capacitor by superposing the voltage on the Boost inductor and the Boost capacitor,thus realizing the Boost boost conversion function. In the three-rectifier circuit, only one diode is used to charge the Boost capacitor, so the effect of bridge-less PFC is achieved. Rationally arrange the connection position of the input surge suppression circuit so that it has zero loss. As the invention follows the input structure of the traditional BoostPFC, the invention has better EMI effect than the traditional bridgeless PFC circuit.

The invention relates to a voltage division step-down Cuk converter circuit which comprises a power switch tube S, a diode D1, a diode D2, a diode D3, a diode D4, a capacitor C1, a capacitor C2, an output electrolytic capacitor Co, an inductor L1 and an inductor L2. The capacitor C1, the capacitor C2, the diode D2, the diode D3 and the diode D4 form a voltage division circuit structure, and a step-down range is widened. The voltage division step-down Cuk converter circuit can realize large step-down change, reasonable PWM (pulse width modulation) duty ratio control and floor control for a switch, and has the advantages of continuous input and output current, low pulse, high circuit conversion efficiency, fine EMI (electro-magnetic interference) effect, convenience in control and the like.

A power control apparatus with dynamical adjustment of driving capability for converting an input power into an output power includes a transformer, a switch transistor connected to the transformer, a pulsed width modulation (PWM) driving controller generating a PWM signal and connected to the switch transistor, an isolation element, an output diode and an output capacitor. The first side coil of the transformer and the switch transistor are connected to the input power, the second side coil of the transformer is connected to the output diode and further connected to the output capacitor and an external load. The isolation element converts the output power into a feedback signal providing the PWM driving controller to dynamically control the PWM driving signal through adjustment so as to implement the optimal turn-on current for the switch transistor. Therefore, electrical performance and conversion efficiency are greatly improved by reducing the switching loss.

Disclosed is a novel high-density magnetic composite material for an inductor. The material is composed of 6-12% of high-temperature resin glue and 88-94% of magnetic powder body in percentage by weight. An integrated inductor magnetic core is simply prepared by means of the magnetic composite material of the disclosure without a large press, thus saving the device investment. The mold loss in a pressing process is reduced, and the production cost is reduced. The operation is simple, a magnet of a complex shape can be produced, and an oversized magnet can be produced. A closed magnetic circuit is formed, and the EMI effect is good. The magnetic composite material of the disclosure enables the density of a solidified magnet to be high under the action of special high-temperature resin glue, it can be guaranteed that the density is 5.5-6.2 g / cm3, the sensitive quality value for preparing an inductor is high, and the initial permeability can be 14μ or above. The magnetic composite material of the disclosure can bear a higher temperature, and can work at the temperature of 180° C. The magnetic composite material of the disclosure is high in utilization rate, low in scrap rate and low in dust rate, and meets the requirement for environmental protection.

Provided is a method for manufacturing a high-density integrally-molded inductor, comprising the following steps: (1) winding an enameled wire coil to be spiral; (2) mechanically pressing first ferromagnetic powder into a magnetic core; (3) mounting the magnetic core into a hollow cavity of the enameled wire coil; (4) mounting the enameled wire coil provided with the magnetic core into an injection mold; (5) uniformly mixing and stirring resin glue, a coupling agent and an accelerant, to obtain high-temperature resin glue; (6) uniformly stirring second ferromagnetic powder and the high-temperature resin glue, to obtain a magnetic composite material; (7) injecting the magnetic composite material into a mold cavity of the injection mold for molding, and solidifying the magnetic composite material to obtain an outer magnet; and (8) cooling and de-molding the outer magnet, to obtain a molded inductor.

The invention discloses a novel high density integrated electric inductance manufacturing method, which comprises: (1) winding an varnished wire coil into a spiral shape; (2) making first iron magnetic powers into a magnetic core through mechanical pressing; (3) packing the magnetic core into a hollow cavity of the varnished wire coil; (4) packing the varnished wire coil packed with the magnetic core into an injection mold; (5) uniformly mixing and blending resin adhesive, coupling agent and accelerant to obtain high temperature resin adhesive; (6) uniformly mixing and blending the second iron magnetic powers and the high temperature resin adhesive to obtain magnetism composite material; (7) injecting the magnetism composite material into a mold cavity of the injection mold to mold, and solidifying to obtain external magnetic body; and (8) cooling and stripping to obtain molded electric inductance. According to the invention, the volume of the electric inductance manufactured with the method provided herein is small; the density is high; the relative magnetic conductivity is high; the cooling performance is good; the service life is long; the electric inductance is molded as a whole; and the manufacturing method of the electric inductance is simple, thus reducing the production cost.

The invention provides a driving circuit, a control chip circuit, a power adapter and electronic equipment. The driving circuit comprises an operational amplifier circuit, a comparator, a first NMOS tube, a second NMOS tube, a third NMOS tube, a first PMOS tube, a second PMOS tube, a first driving control module and a second driving control module. A first resistor, a second resistor and the first NMOS tube are used for forming an LDO negative feedback system. By adopting the embodiment of the invention, the EMI problem caused by a GaN power tube in the charging application can be solved, and the accuracy requirement of the driving voltage of the GaN power tube can be met.

The invention relates to a voltage division step-down Cuk converter circuit which comprises a power switch tube S, a diode D1, a diode D2, a diode D3, a diode D4, a capacitor C1, a capacitor C2, an output electrolytic capacitor Co, an inductor L1 and an inductor L2. The capacitor C1, the capacitor C2, the diode D2, the diode D3 and the diode D4 form a voltage division circuit structure, and a step-down range is widened. The voltage division step-down Cuk converter circuit can realize large step-down change, reasonable PWM (pulse width modulation) duty ratio control and floor control for a switch, and has the advantages of continuous input and output current, low pulse, high circuit conversion efficiency, fine EMI (electro-magnetic interference) effect, convenience in control and the like.

The invention relates to a flat cable which comprises a pair of insulating films, a plurality of conductors, a dielectric layer, at least one bonding layer and a coating layer, wherein the conductors are clamped between the insulating films and arranged left and right at intervals, and the dielectric layer, the bonding layer and the coating layer sequentially cover the outer side of one insulating film; the dielectric layer is made of PET, PE, PP or CPP; the surface of the bonding layer is bonded with a permeability magnetic material, and the bonding layer can provide a good EMI effect. The high-frequency performance of the flat cable is improved.

The embodiments of the present invention disclose an EMI common-mode inductor of a new winding method and a winding method for the EMI common-mode inductor, relating to the technical field of common-mode inductors. The EMI common-mode inductor of the new winding method comprises a toroidal magnetic core, and wound at symmetric positions on two sides of the toroidal magnetic core, two windings and four lead ends. Each winding is a multi-segment winding, and multiple layers are wound around each segment of a winding. Two lead ends of each winding are disposed at two ends of the winding respectively, and one of the lead ends is positioned at the innermost layer of the winding and the other lead end is positioned at the outermost layer of the winding. The embodiments of the present invention can ensure EMI effect, realize automatic winding, effectively improve production efficiency, greatly save labor, lower reject ratio, reduce product cost, and achieve win-win between a client and a supplier.

Disclosed is a loading and unloading device for a long handle module, comprising a housing (100), a pull ring (200), tension springs (310, 320), a brake disc (400) and a cover plate (500). The housing (100) comprises a first cavity (116), a second cavity (102) and a U-shaped beam (115), the U-shaped beam (115) separating the first cavity (116) from the second cavity (102). The brake disc (400) comprises a base body (412), a first U-shaped groove (409), a second U-shaped groove (410), a bend structure (403) and a third inclined surface (401). The first U-shaped groove (409), the second U-shaped groove (410) and the bend structure (403) are provided on the base body (412), and the third inclined surface (401) is provided on the bending structure (403). The pull ring (200) comprises a handle (210), a pressing rod (201) and a pressing head (202), and the pressing head (202) is arranged on the pressing rod (201). The cover plate (500) includes a pressing tongue (506). The brake disc (400) in the device tilts downwards to pry the tongue (701) of a shielding cage (700) from a lock catch (101) of the housing (100) to unload the module, thereby solving the following problems: the direct-pulling type loading and unloading mechanism for modules in the prior art has high requirements on the wall thickness of the housing (100), a relief structure designed for the housing (100) influences the EMI performance, and the structure of the loading and unloading mechanism has poor reliability, narrow application range, and installation complicity.

The invention discloses a control method and device of a switch tube and an air conditioner. When the control method is used, a frequency of an input power supply of a power factor correction (PFC) circuit is periodically acquired, a switch frequency of a power switch tube is set, an output duty ratio of the power switch tube is calculated according to an AC voltage value an AC current value, which are acquired, of the input power supply of the PFC circuit and an acquired DC bus voltage value, and the power switch tube is driven to be periodically switched off or switched on according to the switch frequency and the output duty ratio. By the control method, the switch-on and the switch-off of the power switch tube can be controlled according to different frequencies of the input power supply, the power factor of the PFC circuit is increased, so that the optimal electro magnetic interference (EMI) effect is achieved.

The invention discloses a novel circular-ring-shaped high-power electric reactor. The electric reactor comprises a magnetic core and a coil. The magnetic core is a circular-ring-shaped magnetic core formed by two identical semicircular-ring-shaped magnetic core bodies in a combined mode, the diameter of the circular-ring-shaped magnetic core ranges from 7 inches-20 inches, and the magnet density of the circular-ring-shaped magnetic core ranges from 5.5 g / cm<3> to 6.2 g / cm<3>. The two semicircular-ring-shaped magnetic core bodies are sleeved with the coil which is a spiral varnished wire coil formed by a flat wire in a vertical winding mode. The semicircular-ring-shaped magnetic core bodies are formed by pouring a magnetic composite material composed of ferromagnetic powder and high-temperature resin adhesive through a semicircular-ring-shaped mould. The electric reactor is simple in structure, low in production cost, light in weight, low in noise, low in loss, good in surface heat dissipation and long in service life; the process is simple, and automatic operation is easy to achieve; the utilization rate of the magnetic core is high, magnetic leakage is small, and the EMI effect is good.

The present application provides a drive circuit and related products, the drive circuit includes: a first segment drive circuit and a second segment drive circuit, wherein the first segment drive circuit is connected to the second segment drive circuit; The second section of the driving circuit is used to drive the external power transistor to realize the driving function; the driving current of the second section of the driving circuit is E times of the driving current of the first section, and the said E is greater than 1. Adopting the embodiment of the present application, since the first section of the driving circuit is driven by a small current, and the second section of the driving circuit is driven by a large current, the change of di / dt can be reduced, the driving voltage of the power tube can be increased smoothly, and the EMI effect of the chip can be improved.

Disclosed is a dynamic regulation power controller having a work voltage input pin, a feedback voltage input pin, a driving voltage output pin, a current sensing input pin, and a regulation power input pin, and being in collocation with a switching unit, an input power processing unit, a transformer, a current sensing resistor, a power regulation unit, an output rectification unit, and an output capacitor for converting an input AC voltage into an output voltage for supplying a load. In particular, the driving voltage and the driving current are dynamically adjusted according to the feedback voltage and the current sensing signal, thereby greatly increasing efficiency of power conversion and Electromagnetic Interference (EMI).