Abstract: A resonant transformer with adjustable leakage inductance includes a secondary winding group, a primary winding group, a magnetic sheet and a core group. The primary winding group is provided on a bobbin of the secondary winding group, and the magnetic sheet is provided in the bobbin. The secondary winding group, the primary winding group and the magnetic sheet include a first through hole, a second through hole and a through hole, respectively. The core group includes a first core and a second core symmetrically disposed, which are disposed on top of and at the bottom of the primary winding group, respectively. During operation of the resonant transformer, the degree of coupling between the primary and secondary sides can be changed using the magnetic sheet. This allows the native leakage inductance to be altered to satisfy demands for various different resonant frequencies.

Abstract: An upright composite common mode coil assembly includes a coil carrier and a seat. The coil carries includes two bobbins with a plurality of coils wounded thereon. The seat includes a base, a bottom portion, a top portion and a separating portion. The base has a back plate on a surface thereof, hollow portions formed at an upper position and a lower position thereof, a wire slot and an indentation are provided at either side of the back plate. The bottom portion and the top portion extend vertically from two sides of the base. A recessed portion is formed at each of the corners of the bottom portion, and a pin is inserted into each of the recessed portions. The top portion has a flat top face. The separating portion extends from another surface of the base and tapered to form a curved surface, and form two receiving slots with the top portion and the bottom portion, respectively.

Abstract: A headlight with a modular projection module for enhancing illumination intensity includes a base, a lighting module, a reflective cover, a light-shielding member and a lens assembly. The base has a connection portion obliquely formed on a top of the base. The lighting module is mounted on the connection portion of the base. The reflective cover is mounted on the connection portion of the base with an inner reflective surface facing the lighting module. The lens assembly is mounted on a front portion of the base. The light-shielding member is mounted on a rear portion of the lens assembly. As the lighting module is located below a horizontal center line of the lens assembly and the connection portion of the base is obliquely arranged, the reflective cover can significantly reflect light emitted from the lighting module to enhance illumination intensity of the headlight.

Abstract: A headlight with a modular projection module for enhancing illumination intensity includes a base, a lighting module, a reflective cover, a light-shielding member and a lens assembly. The base has a connection portion obliquely formed on a top of the base. The lighting module is mounted on the connection portion of the base. The reflective cover is mounted on the connection portion of the base with an inner reflective surface facing the lighting module. The lens assembly is mounted on a front portion of the base. The light-shielding member is mounted on a rear portion of the lens assembly. As the lighting module is located below a horizontal center line of the lens assembly and the connection portion of the base is obliquely arranged, the reflective cover can significantly reflect light emitted from the lighting module to enhance illumination intensity of the headlight.

Abstract: A modularized headlight has a heat sink base, a lens assembly on a front end of the heat sink base, a first illuminating module and a first reflector on a first stage of the heat sink base, a second illuminating module and a second reflector on a second stage of the heat sink base, and a shading component on the first stage. When the first illuminating module is emitting light, the light beams are reflected by the first reflector toward the lens assembly through the shading component to provide a low beam mode. When the second illuminating module is emitting light, the light beams are reflected by the second reflector toward the lens assembly to provide a high beam mode. The modularized headlight is switched between the two modes without mechanical mechanism so that components of the modularized headlight may not be worn out and durability is improved.

Abstract: A headlight with a modular projection module for enhancing illumination intensity includes a base, a lighting module, a reflective cover, a light-shielding member and a lens assembly. The base has a connection portion obliquely formed on a top of the base. The lighting module is mounted on the connection portion of the base. The reflective cover is mounted on the connection portion of the base with an inner reflective surface facing the lighting module. The lens assembly is mounted on a front portion of the base. The light-shielding member is mounted on a rear portion of the lens assembly. As the lighting module is located below a horizontal center line of the lens assembly and the connection portion of the base is obliquely arranged, the reflective cover can significantly reflect light emitted from the lighting module to enhance illumination intensity of the headlight.

Abstract: A resonant high current density transformer with an improved structure includes a secondary insulating bobbin, a primary insulating bobbin and a core assembly. The secondary insulating bobbin includes a base. Two posts extend from a first side of the base, and a raised plate extends from a second side of the base, the second side is opposite to the first side. The two posts and the raised plate form a receiving space for receiving an insulating sheath having a plurality of sleeves. A secondary winding is provided on each of the sleeve. The primary insulating bobbin having a tunnel is provided at one side of the secondary insulating bobbin. The surface of the primary insulating bobbin is provided with a primary winding and covered by an insulating cover. A core assembly includes a first core and a second core.

Abstract: A resonant high current density transformer including two cores that are abut against each other with their first and second side posts on two sides thereof. A first bobbin envelops the first side posts on the same side of the two cores. A side plate is provided on either end of the first bobbin. The space between the two side plates is divided into two coil slots with a spacer, and at least a wire is wound in each coil slot to form a primary winding. A further second bobbin envelops the second side posts on the same side of the two cores. The outer periphery of the second bobbin is divided into two winding regions by another spacer, and a metal plate envelops each of the winding regions to form a secondary winding. A bobbin mount is disposed at the external flank of the second bobbin with a barrier plate at a side thereof for separating the first and the second bobbins.

Abstract: An improved structure of a transformer includes a bobbin covering at least a portion of a magnetic core set which has a magnetic loop passing through the bobbin, wherein winding grooves and at least one connecting portion extending sideways are provided on the outer peripheral side of the bobbin, and a plurality of notches with lateral openings are provided on the connecting portion. Coils are wound in the winding grooves of the bobbin. The coils have at least a plurality of line ends, each line end passing through a different notch. One positioning pin is embedded in each of the winding grooves near the lateral opening. The positioning pins hold the respective line ends in place by pressing against them. A casing is fitted on the outer peripheral side of the coils to create separation between the coils and the magnetic core set. The casing is provided with a hollow opening such that the outer peripheral side of the coils facing the airflow is exposed to improve the overall heat dissipating efficiency.

Abstract: An offset voltage eliminating circuit structure for a protection mechanism of a dimmer is described. The circuit includes a constant current source, a subtractor and a hysteresis comparator. The constant current source is used for outputting a stable current, the output of the constant current source is connected with a dimming signal input through a current-limiting resistor, and the dimming signal input is connected with an output of an external traditional dimmer.

Abstract: An isolation dimmer circuit structure includes a control circuit module having an input end for receiving a sensing signal and an output end for outputting a control signal. An optocoupler is provided between the control circuit module and a light source power supply circuit. The light source power supply circuit is further connected to a light source. A protection circuit includes first and second resistors and first and second diodes. The first resistor is connected in series between the positive terminal of a DC power supply and the anode of the first diode, forming a node A, the cathode of the first diode is connected to a first terminal of a control input end connected to a traditional dimmer circuit to form an overvoltage protection mechanism.

Abstract: A bobbin structure with winding grooves for adjusting coupling at least includes: a bobbin body, a hole provided in the bobbin body for allowing magnetic wires to pass through, and at least three separated winding grooves with different lengths provided around the outer peripheral side of the hole. The primary winding (or the secondary winding) of the coils of a transformer is selectively wound into one of the winding groove, while the secondary windings (or the primary windings) are wound into the rest of the winding grooves. By altering the numbers of turns of the secondary windings (or the primary windings) distributed in the winding grooves, different coupling effects can be achieved with respect to the primary winding (or the secondary winding). As a result, the transformer leakage inductance and the output impedance can be conveniently adjusted. The design of multiple grooves also reduces the stray capacitances of the windings, thereby increasing the bandwidth of the transformer.

Abstract: A beam-controllable headlight has a lamp base, a first reflector and a second reflector. A lighting-emitting panel with a light source is mounted on the rear portion of the lamp base. The first reflector is mounted on the rear portion of the lamp base and has a reflective surface facing the rear portion. The second reflector has two end points. A normal of the light-emitting panel passes through one of the end points of the second reflector, and an acute angle is included between the normal of the light-emitting panel and a straight line passing through the other end point and a point on the light-emitting panel defining the normal of the light-emitting panel. Light beams are reflected twice to rule out scattering light generated above a cutoff line of the headlight and enhance brightness under the cutoff line.

Abstract: An improved structure of a transformer includes a bobbin covering at least a portion of a magnetic core set which has a magnetic loop passing through the bobbin, wherein winding grooves and at least one connecting portion extending sideways are provided on the outer peripheral side of the bobbin, and a plurality of notches with lateral openings are provided on the connecting portion. Coils are wound in the winding grooves of the bobbin. The coils have at least a plurality of line ends, each line end passing through a different notch. One positioning pin is embedded in each of the winding grooves near the lateral opening. The positioning pins hold the respective line ends in place by pressing against them. A casing is fitted on the outer peripheral side of the coils to create separation between the coils and the magnetic core set. The casing is provided with a hollow opening such that the outer peripheral side of the coils facing the airflow is exposed to improve the overall heat dissipating efficiency.

Abstract: An improved structure of transformer's lead frame includes at least a lead frame module consisting of a lead frame main body and a lead frame cover, the lead frame main body has a through hole furnished at the center thereof; a bobbin formed at the side of the circumference of the through hole, and a pair of oppositely configured and reversely salient extension parts furnished at sides of the circumference of the through hole, each of the extension parts is combined to the mid-section of the wire connecting seats that have a plurality of wire connecting posts, a plurality of clip indentations are furnished at intervals and at the mid-section of the edge of the two sides of the corresponding extension parts and at the positions covered by the width of the corresponding extension parts.

Abstract: An improved structure of transformer includes a lead frame main body (1), a lead frame cover (2), a trouser-like flap (3), and two iron cores (4) where the lead frame main body (1) has a penetration hole (11) with a bobbin (12) formed at the circumference there around. The trouser-like flap (3) being made of metal has a hollow part (31) for slipping on a bobbin (121) of the lead frame main body (1) also includes horizontally stretched thigh parts (32), (33). The outer circumference of the trouser-like flap (3) is furnished with a primary winding (123). The lead frame cover (2) being a sheet-shaped body has a hollow hole (21) furnished at the center thereof. On the inner-side surface, each of the two iron core (4) has a main core part (41) capable of stretching through the penetration hole (11) of the lead frame main body (1) where the main core part (41) has a containing circumferential trench (43) capable of containing the lead frame main body (1).

Abstract: An LED car light with enhanced cooling effect has a light shell, a fixing base, an LED light module and a reflecting cover. The outer wall extends from the edge of the rear wall and surrounds the rear wall, wherein the outer wall has a cooling section. The fixing base is mounted in the light shell and corresponding in position to the cooling section. The LED light module is mounted on the fixing base and has a base board, a first LED light source and a second LED light source, wherein the base board is in thermal contact with the cooling section of the light shell. The first LED light source and the second LED light source are mounted on the base board. A cooling efficiency of the LED car light is increased due to the thermal contact between the cooling section and the base board.

Abstract: An improved structure of transformer includes a lead frame main body (1), a lead frame cover (2), a trouser-like flap (3), and two iron cores (4) where the lead frame main body (1) has a penetration hole (11) with a bobbin (12) formed at the circumference there around. The trouser-like flap (3) being made of metal has a hollow part (31) for slipping on a bobbin (121) of the lead frame main body (1) also includes horizontally stretched thigh parts (32), (33). The outer circumference of the trouser-like flap (3) is furnished with a primary winding (123). The lead frame cover (2) being a sheet-shaped body has a hollow hole (21) furnished at the center thereof. On the inner-side surface, each of the two iron core (4) has a main core part (41) capable of stretching through the penetration hole (11) of the lead frame main body (1) where the main core part (41) has a containing circumferential trench (43) capable of containing the lead frame main body (1).

Abstract: An improved structure of transformer's lead frame includes at least a lead frame module consisting of a lead frame main body and a lead frame cover, the lead frame main body has a through hole furnished at the center thereof; a bobbin formed at the side of the circumference of the through hole, and a pair of oppositely configured and reversely salient extension parts furnished at sides of the circumference of the through hole, each of the extension parts is combined to the mid-section of the wire connecting seats that have a plurality of wire connecting posts, a plurality of clip indentations are furnished at intervals and at the mid-section of the edge of the two sides of the corresponding extension parts and at the positions covered by the width of the corresponding extension parts.