Abstract: A control circuit, of a control loop, for a lighting driver. The lighting driver is adapted to controllably connect an electronic ballast to an LED light source or lamp. The control circuit comprises a biasing circuit having an adjustable impedance. A tuning circuit adjusts the impedance of the biasing circuit so as to tune a parameter of a frequency response of the control loop and thereby of the lighting driver.

Abstract: A retrofit Light Emitting Diode, LED, tube for connecting to a High Frequency, HF, ballast, which LED tube comprises a switchable capacitor arrangement for ensuring that the ballast does not go into over current protection mode, wherein the switching is controlled based on a desired dimming level of the LED tube. The switchable capacitor arrangement is provided in parallel with said input of said rectifier, and comprises at least a first capacitor and a second capacitor in series, and said control circuit is adapted to configure said switchable capacitor arrangement to conduct the AC power and switch at least one of the first capacitor and the second capacitor between the rectifier and the LED array to block the DC power to said LED array.

Abstract: There is proposed an interface circuit for connecting an electronic ballast to a lighting arrangement, in which control of a coupling configuration of the interface circuit is dependent upon a frequency of the electronic ballast. In particular, a coupling configuration of the interface circuit is controlled by a control arrangement based on the ballast frequency.

Abstract: The present invention relates to a lithium ion battery silicate positive electrode material, and the preparation and an application thereof. Specifically, a silicate positive electrode material is disclosed, which includes a core LiaCoxT1-xSiyM1-yO4 and a carbon coating layer coated on an outer surface of the core. Also disclosed are the preparation and an application of the positive electrode material. A lithium ion battery prepared using the positive electrode material as a positive electrode active material has a discharge capacity greater than 130 mAh/g under a discharge density of 5 mA/g, and a discharge voltage platform greater than 4V.

Abstract: A tubular LED lamp designed for connection to a high frequency ballast. An electrically conductive screen is provided with an electrical connection between an internal node, such as an internal LED ground, and the screen. This provides a low impedance path5 for leakage currents which bypasses the LED string and thus prevents glow.

Abstract: An LED driver uses a switch mode power supply either to provide a regulated LED current (in a first mode) that connects directly to the LED arrangement or a regulated LED voltage (in a second mode) to an LED output terminal. An auxiliary power supply is either based on an auxiliary secondary side (i.e. an auxiliary secondary side winding) when in the first mode, or it is based on the regulated LED voltage when in the second mode. The LED driver further comprises an input adapted to receive a standby command for the driver, wherein the main controlling unit is adapted to control the driver in the second mode when receiving the standby command for the driver. In this way, the driver has a single shared stage which can operated in a regulated current (i.e. constant current) mode to drive the LED arrangement directly or a regulated voltage (i.e. constant voltage) mode. It can adaptively change between modes to improve the standby power efficiency. When the load is turned on (e.g.

Abstract: The invention provides a power converter comprising: an input for receiving input power with a variable nominal mains level, wherein said variable nominal mains level falls within at least 90V to 240V; a main power switch (Q1) driven by the input power, and a control circuit (Q2, Q3) for controlling a control current of the main power switch (Q1), wherein the control circuit in (Q2, Q3) is adapted to sense the level of the input power and draw current from a control terminal of the power switch (Q1) according to the level, and said control circuit is adapted to operate in linear region and increase the drawn current along with the increase of the level throughout the variable nominal mains level of the input power, wherein the control circuit comprises: a Darlington bridge with a first transistor (Q2) and a second transistor (Q3), the first transistor (Q2) with a base terminal connected to a circuit position indicative of the voltage amplitude of the input power, the second transistor (Q3) with a base termina

Abstract: A lighting driver is for receiving an alternating current power supply from a fluorescent lighting ballast and makes use of a closed loop control of a shunt device for selectively shunting the power supply for example to implement dimming control. The closed loop control is adapted based a detected current. This enables low frequency components of the ballast current to be removed or reduced so that a smaller output capacitor is needed.

Abstract: The invention provides a power converter comprising: an input for receiving input power with a variable nominal mains level, wherein said variable nominal mains level falls within at least 90V to 240V; a main power switch (Q1) driven by the input power, and a control circuit (Q2, Q3) for controlling a control current of the main power switch (Q1), wherein the control circuit in (Q2, Q3) is adapted to sense the level of the input power and draw current from a control terminal of the power switch (Q1) according to the level, and said control circuit is adapted to operate in linear region and increase the drawn current along with the increase of the level throughout the variable nominal mains level of the input power, wherein the control circuit comprises: a Darlington bridge with a first transistor (Q2) and a second transistor (Q3), the first transistor (Q2) with a base terminal connected to a circuit position indicative of the voltage amplitude of the input power, the second transistor (Q3) with a base termina

Abstract: An LED driver uses a switch mode power supply either to provide a regulated LED current (in a first mode) that connects directly to the LED arrangement or a regulated LED voltage (in a second mode) to an LED output terminal. An auxiliary power supply is either based on an auxiliary secondary side (i.e. an auxiliary secondary side winding) when in the first mode, or it is based on the regulated LED voltage when in the second mode. The LED driver further comprises an input adapted to receive a standby command for the driver, wherein the main controlling unit is adapted to control the driver in the second mode when receiving the standby command for the driver. In this way, the driver has a single shared stage which can operated in a regulated current (i.e. constant current) mode to drive the LED arrangement directly or a regulated voltage (i.e. constant voltage) mode. It can adaptively change between modes to improve the standby power efficiency. When the load is turned on (e.g.

Abstract: Described herein are solid solution composites that are used as cathode materials for lithium-ion batteries. The solid solution composite of ? LiMVO4-?LiNi1-x-yCoxMnyO2, in which LiMVO4 has cubic close-packed structure, LiNi1-x-yCoxMnyO2 has hexagonal layered structure, and both share an oxygen lattice fully or partly. The new solid solution materials have advantage for lithium-ion batteries that the working voltage of the composite is adjustable by controlling the molar ratio of ? and ? and have higher working voltage than current secondary battery materials. Also described herein are methods of preparing such composite.

Abstract: A lighting controller and method has light sources which are activated for a respective lighting duration in a repeating non-overlapping sequence. The end of the lighting duration for one light source is detected for triggering the switching on of the next light source in the sequence. This provides non-overlapping control of the light sources and provides an efficient and easy to implement the required controller.

Abstract: A lighting controller and method has light sources which are activated for a respective lighting duration in a repeating non-overlapping sequence. The end of the lighting duration for one light source is detected for triggering the switching on of the next light source in the sequence. This provides non-overlapping control of the light sources and provides an efficient and easy to implement the required controller.

Abstract: Described herein are solid solution composites that are used as cathode materials for lithium-ion batteries. The solid solution composite of ? LiMVO4-?LiNi1-x-yCoxMnyO2 in which LiMVO4 has cubic close-packed structure, LiNi1-x-yCoxMnyO2 has hexagonal layered structure, and both share an oxygen lattice fully or partly. The new solid solution materials have advantage for lithium-ion batteries that the working voltage of the composite is adjustable by controlling the molar ratio of ? and ? and have higher working voltage than current secondary battery materials. Also described herein are methods of preparing such composite.

Abstract: A fast connector of electronic cigarette comprising a battery adaptor plate 201 above a battery 10, wherein a top surface of the battery adaptor plate 201 is welded with a pair of resilient battery columns 30; a bottom surface of the battery adaptor plate 201 is welded with a 2 pin socket 202; the 2 pin socket 202 and the battery 10 are connected, and the 2 pin socket 202 is connected to the resilient battery columns 30 via the battery adaptor plate 201; upper ends of the resilient battery columns 30 support against a vaporizer socket 40; a pair of electrode columns 401 and a heating wire 403 are fixed on the vaporizer socket 40; two ends of the heating wire 403 are welded and conducted with the electrode columns 401 via conduction wires 402.

Abstract: A fast connector of electronic cigarette comprising a battery adaptor plate 201 above a battery 10, wherein a top surface of the battery adaptor plate 201 is welded with a pair of resilient battery columns 30 to form two electrical poles at a lower end of the fast connector; a bottom surface of the battery adaptor plate 201 is welded with a 2 pin socket 202; the 2 pin socket 202 and the battery 10 are connected to achieve conduction, and the 2 pin socket 202 is connected to the resilient battery columns 30 via the battery adaptor plate 201; upper ends of the resilient battery columns 30 support against a vaporizer socket 40; a pair of electrode columns 401 and a heating wire 403 are fixed on the vaporizer socket 40; two ends of the heating wire 403 are welded and conducted with the electrode columns 401 via conduction wires 402.

Abstract: A new kind of plant essential oil vaporizer comprising a vaporizer main body, a vaporizer socket disposed on the vaporizer main body and a pair of electrode poles disposed inside the vaporizer socket; two openings are disposed on the electrode poles respectively; a heating wire is disposed above the electrode poles and they are connected via rivets and the openings. The new kind of plant essential oil vaporizer has the following advantages: the electrode poles and the heating wire are connected directly by riveting, therefore assisting conduction wire and riveting copper columns are not required; the electrode poles constitute two electrical poles of the vaporizer inside the vaporizer socket. The vaporizer has a simple structure and low manufacturing cost, and only requires simple manufacturing technique and can be manufactured efficiently.