Abstract: The present invention relates to a card type LED driver and transportation means with the card type driver, characterized in that the card type LED driver includes an installation card tray and a replaceable driving circuit board, the installation card tray being secured to an LED module or an LED lamp with the LED module so as to drive and/or control the LED module through an electrical interface in the installation card tray; the replaceable driving circuit board has at least one AC directly driven LED driving unit, the replaceable driving circuit board being pluggably secured to the installation card tray, thus making possible selectively installing a corresponding replaceable driving circuit board according to lighting scenario requirements, dimming requirements, and electrical characteristics of the LED module.

Abstract: Disclosed is an alternating current dimming drive circuit for an LED, comprising a rectification unit and N stages of LED direct current drive circuits. In the ith stage of LED direct current drive circuit, a first end of the ith voltage sampling unit and an input end of the ith LED light source module directly or indirectly receive the output voltage of the rectification unit; a voltage division end of the ith voltage sampling unit is connected to a second input end of the ith switch unit; and a first input end of the ith switch unit is connected to an output end of the ith LED light source module, and an output end of the ith switch unit, a second end of the ith voltage sampling unit and a second output end of the rectification unit are grounded. When the ith switch unit is switched on, the first to the ith LED light source modules emit light.

Abstract: Polymers, and systems and methods for making and using the same are described herein. A polymer includes ethylene and at least one alpha olefin having from 4 to 20 carbon atoms. The polymer has a melt index ratio (MIR) greater than about 40. The polymer also has a value for Mw1/Mw2 of at least about 2.0, wherein Mw1/Mw2 is a ratio of a weight average molecular weight (Mw) for a first half of a temperature rising elution (TREF) curve from a cross-fractionation (CFC) analysis to an Mw for a second half of the TREF curve. The polymer also has a value for Tw1?Tw2 of less than about ?15° C., wherein Tw1?Tw2 is a difference of a weight average elution temperature (Tw) for the first half of the TREF curve to a Tw for the second half of the TREF curve.

Abstract: The present disclosure discloses a multipath current source switching device, including a switching control unit, N current paths, and N loads. Each current path is formed by a constant current source circuit and a switching circuit. One terminal of a first load is coupled to a load power supply, and the other terminal of the first load is coupled to an output terminal of a constant current source circuit of a first current path and one terminal of a second load; one terminal of an ith load is coupled to the other terminal of an (i?1)th load and an output terminal of a constant current source circuit of an ith current path; and the switching control unit controls an output current of a corresponding constant current source circuit through a corresponding switching circuit.

Abstract: An LED AC drive circuit, comprising: a rectification unit, a current-limiting unit, M LED units and M?1 connected/disconnected control connection lines; each LED unit comprising ni LEDs connected in series, wherein 1?i?M, and n1+n2+ . . . +nM=N, 1?M?N, and N is determined by formula (I). The M LED units are connected sequentially to the positive end of the rectification unit and to the current-limiting unit connected to the negative end of the rectification unit; the first LED unit comprises switches connected in series at the negative end of the LED string; the ith LED unit comprises switches connected in series at the positive end of the LED string and switches connected in series at the negative end of the LED string, wherein 1?i?M?1; and the Mth LED unit comprises switches connected in series at the positive end of the LED string.

Abstract: The present invention relates to a card type LED driver and transportation means with the card type driver, characterized in that the card type LED driver includes an installation card tray and a replaceable driving circuit board, the installation card tray being secured to an LED module or an LED lamp with the LED module so as to drive and/or control the LED module through an electrical interface in the installation card tray; the replaceable driving circuit board has at least one AC directly driven LED driving unit, the replaceable driving circuit board being pluggably secured to the installation card tray, thus making possible selectively installing a corresponding replaceable driving circuit board according to lighting scenario requirements, dimming requirements, and electrical characteristics of the LED module.

Abstract: Disclosed are an alternating current rectifying circuit and an alternating current rectifying method for driving an LED module.

Abstract: An LED AC drive circuit, comprising: a rectification unit, a current-limiting unit, M LED units and M?1 connected/disconnected control connection lines; each LED unit comprising ni LEDs connected in series, wherein 1?i?M, and n1+n2+ . . . +nM=N, 1?M?N, and N is determined by formula (I). The M LED units are connected sequentially to the positive end of the rectification unit and to the current-limiting unit connected to the negative end of the rectification unit; the first LED unit comprises switches connected in series at the negative end of the LED string; the ith LED unit comprises switches connected in series at the positive end of the LED string and switches connected in series at the negative end of the LED string, wherein 1?i?M?1; and the Mth LED unit comprises switches connected in series at the positive end of the LED string.

Abstract: Polymers, and systems and methods for making and using the same are described herein. A polymer includes ethylene and at least one alpha olefin having from 4 to 20 carbon atoms. The polymer has a melt index ratio (MIR) greater than about 40. The polymer also has a value for Mw1/Mw2 of at least about 2.0, wherein Mw1/Mw2 is a ratio of a weight average molecular weight (Mw) for a first half of a temperature rising elution (TREF) curve from a cross-fractionation (CFC) analysis to an Mw for a second half of the TREF curve. The polymer also has a value for Tw1?Tw2 of less than about ?15° C., wherein Tw1?Tw2 is a difference of a weight average elution temperature (Tw) for the first half of the TREF curve to a Tw for the second half of the TREF curve.

Abstract: Polymers, and systems and methods for making and using the same are described herein. A polymer includes ethylene and at least one alpha olefin having from 4 to 20 carbon atoms. The polymer is formed by a trimmed catalyst system including a supported catalyst including bis(n-propylcyclopentadienyl) hafnium (R1)(R2) and a trim catalyst comprising meso-O(SiMe2Ind)2Zr(R1)(R2), wherein R1 and R2 are each, independently, methyl, chloro, fluoro, or a hydrocarbyl group.

Abstract: Catalyst systems and methods for making and using the same. A method of polymerizing olefins to produce a polyolefm polymer with a multimodal composition distribution, includes contacting ethylene and a comonomer with a catalyst system. The catalyst system includes a first catalyst compound and a second catalyst compound that are co-supported to form a commonly supported catalyst system. The first catalyst compound includes a compound with the general formula (C5HaR1b) (C5HcR24)HfX2. The second catalyst compound comprises the following formula: (A), wherein each R3 or R4 is independently H, a hydrocarbyl group, a substituted hydrocarbyl group, or a heteroatom group, wherein each R3 or R4 may be the same or different, and each X is independently a leaving group selected from a labile hydrocarbyl, a substituted hydrocarbyl, a heteroatom group, or a divalent radical that links to an R3 group.

Abstract: A system and method of producing polyethylene, including: polymerizing ethylene in presence of a catalyst system in a reactor to form polyethylene, wherein the catalyst system includes a first catalyst and a second catalyst; and adjusting reactor conditions and an amount of the second catalyst fed to the reactor to control melt index (MI), density, and melt flow ratio (MFR) of the polyethylene.

Abstract: Disclosed are an alternating current rectifying circuit and an alternating current rectifying method for driving an LED module. By using the present invention, stability of an output voltage can be improved, and luminous efficiency of the LED module can be improved.

Abstract: An LED lighting drive circuit supplies power for N groups of LED loads. The LED lighting drive circuit comprises N current paths, N groups of LEDs, and a constant current section. The LED lighting drive circuit enables the current of LED lamps to change in a sinusoidal half-wave form with the utility AC input, and keeps the current a constant effective value.

Abstract: The present invention discloses a white LED light emitting device driven directly by constant current in manner of being supplied with alternating current. N parallel branches, consisting of LED modules and constant current units which are in series connection with the LED modules, are connected to an output terminal of a rectification circuit, and by setting the current value, the turning-off voltage, and the turning-on voltage of the constant current unit of each branch, the periodic flickers generated due to changes in the voltage of the alternating current can be avoided. Because the current of each branch is constant, the changes in junction temperatures do not result in the current changing in LED, and the reliability is improved. Along with the increase of the number of the branches, the driving current waveform approximates a sine wave, and the power factor and the efficiency of the light emitting device are improved.

Abstract: Disclosed are an alternating current rectifying circuit and an alternating current rectifying method for driving an LED module. By using the present invention, stability of an output voltage can be improved, and luminous efficiency of the LED module can be improved.

Abstract: An LED lighting drive circuit supplies power for N groups of LED loads. The LED lighting drive circuit comprises N current paths, N groups of LEDs, and a constant current section. The LED lighting drive circuit enables the current of LED lamps to change in a sinusoidal half-wave form with the utility AC input, and keeps the current a constant effective value.

Abstract: Disclosed is an alternating current dimming drive circuit for an LED, comprising a rectification unit and N stages of LED direct current drive circuits. In the ith stage of LED direct current drive circuit, a first end of the ith voltage sampling unit and an input end of the ith LED light source module directly or indirectly receive the output voltage of the rectification unit; a voltage division end of the ith voltage sampling unit is connected to a second input end of the ith switch unit; and a first input end of the ith switch unit is connected to an output end of the ith LED light source module, and an output end of the ith switch unit, a second end of the ith voltage sampling unit and a second output end of the rectification unit are grounded. When the ith switch unit is switched on, the first to the ith LED light source modules emit light.

Abstract: An ultrathin LED light engine (100) comprises a protective cover (106), a driving circuit board (101), an aluminum substrate (103) and at least one LED module (104). A double-sided high-viscosity heat conducting plate (102) covers the first surface of the aluminum substrate (103) to fix the driving circuit board (101); the at least one LED module (104) is fixed on the first surface and insulated from the aluminum substrate (103) by means of an insulating layer (200) on the first surface; a conductive circuit for electrically connecting the at least one LED module (104) and the driving circuit board (101) is arranged on the insulating layer (200); and the size of the aluminum substrate (103) at least at the local peripheral outer area is greater than that of the driving circuit board (101), so that the double-sided high-viscosity heat conducting plate (102) on the first surface at least locally fixes the protective cover (106).

Abstract: Disclosed are an alternating current rectifying circuit and an alternating current rectifying method for driving an LED module.