Abstract: A DC chopper comprising a control unit and a power circuit and a DC chopping method for a DFIG (doubly fed induction generator) system are provided. The input terminal of the control unit is coupled to a DC capacitor of a converter to detect a DC voltage. The power circuit includes input terminals, an overvoltage protection module, a rectifier module and output terminals. The overvoltage protection module comprises at least one discharge unit formed from a discharge resistor and a switch element, and the rectifier module is coupled in parallel to the overvoltage protection module. When a grid voltage drops, the control unit outputs a corresponding control signal to drive the switch element to be ON or OFF, and the output terminal of the power circuit absorbs a portion of rotor inrush current, so as to impose over-current protection.

Abstract: An electrical connector comprises an insulative housing, a plurality of contacts retained in the insulative housing and a metal shell enclosing the insulative housing. The insulative housing has a inserting slot. The contacts include a plurality of grounding contacts and signal contacts, the contacts each comprise a retaining portion retained in the insulative housing, a contacting portion extending forwardly from a side of the retaining potion and extending into the inserting slot and a soldering portion extending from the other side of the retaining portion. The shield shell has a top wall covering a top of the insulative housing and the shield shell comprising at least a pair of resisting arms, the pair of resisting arms resisting the two sides of the grounding contact along a left-to-right direction.

Abstract: An electrical card connector comprises an insulative housing, a plurality of contacts mounted to the insulative housing and a cover covering the insulative housing. The insulative housing defines a receiving space and a mounting wall in a rear of the receiving space. The contact has a contacting portion extending into the receiving space and a retaining portion retained to the mounting wall. The cover has a top wall covering a top of the receiving space. The contacts include a grounding contact, the top wall has an elastic finger extending therefrom and touching the grounding contact to achieve grounding. By this arrangement, the electrical card connector has an additional grounding path, and improves the performance of the electrical card connector.

Abstract: A card connector (100) includes an insulative housing (1), a number of conductive contacts (2) retained in the insulative housing (1) and a shell (3) enclosing over the insulative housing (1). The shell (3) includes a top wall (31) and a pair of side walls (32) downwardly extending from two sides of the top wall (31). The side wall (32) has a latching arm (36) at the bottom thereof to upwardly abut against a bottom face (12) of the insulative housing (1). The insulative housing (1) has a top surface (11) facing the top wall (31). The top surface (11) and the top wall (31) define a receiving cavity (30) to receive an electrical card. The side wall (32) also has a limiting portion (33) extending into the receiving cavity (30) and downwardly abutting against the top surface (11) of the insulative housing (1). Therefore, the size of the card connector (100) is smaller which is in favor of a small-scale development of the card connector (100).

Abstract: An electrical connector for electrically connecting a chip module to a printed circuit board. The electrical connector includes an insulating body and a pressing plate for covering the insulating body. A receiving area for receiving the chip module is disposed on the insulating body. Multiple terminal receiving slots are provided inside the receiving area, and at least one bump is disposed inside the receiving area. An opening is provided at the pressing plate. An urging portion is disposed at each of two opposite sides of the opening, respectively, and pressing force-application points are formed at two ends of the urging portion. When the pressing plate covers the insulating body, the bump is correspondingly located below the force-application points to bear the chip module, so as to avoid warps and deformations of the chip module when pressed.

Abstract: An electrical connector for electrically connecting a chip module to a printed circuit board. The electrical connector includes an insulating body and a pressing plate for covering the insulating body. A conductive region for receiving the chip module is disposed on the insulating body. Multiple terminal receiving slots are provided inside the conductive region, and at least one bump is disposed inside the conductive region. An opening is provided at the pressing plate. An urging portion is disposed at each of two opposite sides of the opening, respectively, and pressing force-application points are formed at two ends of the urging portion. When the pressing plate covers the insulating body, the bump is correspondingly located below the force-application points to bear the chip module, so as to avoid warps and deformations of the chip module when pressed.

Abstract: An electrical card (100) connector includes an insulative housing (1), a set of contacts (2) received in the housing and a locking portion (17) retained in the housing (1). The housing (1) defines a receiving cavity (10) for receiving an electrical card. The locking portion (17) has an elastic arm (171) connected with the housing (1) and a latching portion (172) extending forwardly from the elastic arm (171) and extending into the receiving cavity (10) to retain the electrical card. The locking portion (17) can deflect along a left to right direction under stress, so the insertion and extraction force of the electrical card insert in and eject out of the receiving cavity (10) moderately, it can not only ensure the electrical card connector (100) lock the electrical card firmly but also ensure the electrical card not be damaged easily.

Abstract: An electrical connector includes an electrical connecting base for bearing a chip module, a press cover and an operating member. The press cover is covering on the electrical connecting base, and has a first fixing portion and a second fixing portion. A center line of the press cover passes through the second fixing portion. The press cover is provided with a first pressing portion and a second pressing portion for pressing the chip module. The first pressing portion and the second pressing portion are respectively located on two sides of the center line, and the second pressing portion is closer to the second fixing portion than the first pressing portion is. The operating member has a locking portion for pressing the second fixing portion, and an operating portion extending from the locking portion. The first pressing portion is closer to the operating portion than the second pressing portion is.

Abstract: A Universal Serial Bus device includes a PCB module, a plastic package shell and a power module. The PCB module includes a PCB, and a storage chip and a control chip both arranged on the PCB module. The PCB includes opposite front end and rear end, and opposite upper surface and lower surface. The upper surface has a number of contacting portions, and the storage chip and the control chip being arranged on the lower surface. The plastic package shell at least encapsulates the lower surface of the PCB to encapsulate the storage chip and the control chip. The power module is electrically connected to the part of the PCB module where is not encapsulated by the plastic package shell.

Abstract: An electrical card connector for holding a card with a notch defined on a lateral side thereof, includes an insulative housing, a number of contacts and a push-push mechanism. The push-push mechanism includes a slider movable between an initial position and a final locking position along a front-to-back direction, a spring abutting against the slider and an elastic locking arm having a card lock for locking with the notch of the card. The slider further includes a rigid protrusion to engage with the notch of the card. The rigid protrusion not only helps the card lock hold the card when the slider is located at the final locking position, but also helps the card lock prevent the card from flying out of the card receiving space when the slider moves from the final locking position back to the initial position.

Abstract: An electronic card connector defining a receiving space for receiving an electronic card, includes an insulative housing, a number of contacts retain in the insulative housing, and a metal shell covering the insulative housing. The insulative housing has a bottom wall. The metal shell has a top wall opposed to the bottom wall, and a pair of side walls. The metal shell defines a depressed portion outwardly recessed from an intersection portion of the top wall and the side wall.

Abstract: A DC chopper comprising a control unit and a power circuit and a DC chopping method for a DFIG (doubly fed induction generator) system are provided. The input terminal of the control unit is coupled to a DC capacitor of a converter to detect a DC voltage. The power circuit includes input terminals, an overvoltage protection module, a rectifier module and output terminals. The overvoltage protection module comprises at least one discharge unit formed from a discharge resistor and a switch element, and the rectifier module is coupled in parallel to the overvoltage protection module. When a grid voltage drops, the control unit outputs a corresponding control signal to drive the switch element to be ON or OFF, and the output terminal of the power circuit absorbs a portion of rotor inrush current, so as to impose over-current protection.

Abstract: The invention discloses a kit which comprises a formulation containing artemisinin or the derivatives thereof, a formulation containing ribonuclease, and a specification.

Abstract: A card connector includes an insulative housing defining a card receiving space, a number of contacts retained in the insulative housing, an ejector received in the insulative housing and a metal shell covering the insulative housing. The ejector includes a movable slider, a spring, and a pin member, the slider defines a heart-shaped slot, and the pin member has a positioning end being rotatablely retained to the insulative housing and a free end being slidable along the heart-shaped slot to lock the slider. A latching piece is retained to the insulative housing and has a catching portion catching the pin member and an elastic portion connecting with the catching portion. When the pin member slides, the catching portion will bring the elastic portion to deflect and provide an outward or inward force to the pin member so as to control a movement trace of the pin member.

Abstract: A card connector (100) comprises an insulative housing (1), a plurality of contacts (2) retained in the insulative housing (1) and an ejecting mechanism (4). The insulative housing (1) defines an interface (14) in front and a receiving space (10) extending backwardly from the interface (14). The ejecting mechanism (4) comprises a slider (41), a spring (42) sandwiched between the slider (41) and the insulative housing (1), and a pole (43) for controlling the slider (41). The slider (41) defines a heart-shape groove (414) and a heart-shape block (415) located in the heart-shape groove (414). The heart-shape groove (414) includes a first slot (4141). The heart-shape block (415) includes a mucro (4154) at a rear end thereof. The mucro (4154) and the first slot (4141) define an escaping space (4153) therebetween. When the pole (43) moves aslant, the escaping space (4153) will receive the pole (43) for avoiding the pole (43) colliding with the mucro (4153).

Abstract: An electrical connector includes an insulative housing having an inserting slot, and a bottom wall under the inserting slot. The bottom wall defines a supporting surface extending along a front-to-back direction, a horizontal guiding surface located in front of the supporting surface, and a plurality of depressions recessed from the supporting surface and arranged in one row along a transverse direction perpendicular to the front-to-back direction. A plurality of first contacts each has a planar first contact portion retained in the depression. A plurality of second contacts each has an arc-shaped second contact portion extending upwardly beyond the supporting surface and protruding into the inserting slot. The second contact portions are located behind the first contact portions.

Abstract: An electrical card connector comprises an insulative housing having an inserting slot for receiving a first card and a second card, and a plurality of contacts retained in the housing respectively and including a plurality of first contacts for engaging with the first card, and a plurality of second contacts cooperating with the first contacts for engaging with the second card. The first contacts and the second contacts have retaining portions fixed with the housing, contact portions protruding into the inserting slot from the retaining portions, and soldering portions extending beyond the housing from the retaining portions. The contact portions of the first contacts and the contact portions of the second contacts are positioned at different position along a front-to-back direction. At least one of the first contacts and one of the second contacts share a same soldering tail.

Abstract: An electrical card connector (100) includes an insulative housing (1), a plurality of contacts (2) retained in the insulative housing (1), and a mounting member (3) disposed on the insulative housing (1). The insulative housing (1) defining a receiving space (110). The mounting member (3) includes a first metal plate (31) defines an elastic plate (312) protruding into the receiving space (110) for abutting against the electrical card (200) when the electrical card (200) is inserted into the receiving space (110). The electrical card (200) can be fixed reliably and withdrawn from the electrical card connector (100) conveniently in virtue of the elastic plate (312).

Abstract: A card connector for connecting an electronic card, comprises an insulative housing and an ejector. The insulative housing defines a receiving space extending backwardly along a front to back direction for receiving the electronic card. The ejector comprises a slider, a spring sandwiched between the slider and a rear end of the insulative housing and a pole for controlling movement of the slider. The slider includes a first protrusion and a second protrusion, the card connector has a first guiding groove engaging with the first protrusion and a second guiding groove engaging with the second protrusion, the slider defines a locking portion extending inwardly into the receiving space, the first guiding groove provides an escaping groove for the first protrusion thereby the slider can move along a insertion direction of the electronic card steadily.

Abstract: A card connector (100) includes an insulative housing (1), a number of conductive contacts (2) retained in the insulative housing (1) and a shell (3) enclosing over the insulative housing (1). The shell (3) includes a top wall (31) and a pair of side walls (32) downwardly extending from two sides of the top wall (31). The side wall (32) has a latching arm (36) at the bottom thereof to upwardly abut against a bottom face (12) of the insulative housing (1). The insulative housing (1) has a top surface (11) facing the top wall (31). The top surface (11) and the top wall (31) define a receiving cavity (30) to receive an electrical card. The side wall (32) also has a limiting portion (33) extending into the receiving cavity (30) and downwardly abutting against the top surface (11) of the insulative housing (1). Therefore, the size of the card connector (100) is smaller which is in favor of a small-scale development of the card connector (100).