Signify Holding B.v.

Ecolab USA Inc.

Philips Lighting Holding B.v.

Koninklijke Philips Corporation N.v.

Shanghai Weikai Optoelectronics New Materials Co., Ltd.

Zhi Quan Chen

Xianhui Zhang

Haimin Tao

Jie Fu

Liang Shi

Jane B Wong Shing

Jian Shen

Shan Shan Wang

Junhu Liu

Kelvin Wang

Kang Li

Wen Bai

Raymond D Miller, Jr

Wenli Tu

John Dai

Jian Xu

Feng He

Gang Wang

Chao Li

Zhen Zhou

Chun Yang

Dmytro Viktorovych Malyna

Yulin Zhao

Tijmen Cornelis Van Bodegraven

Dennis Johannes Antonius Claessens

Peiliang Dong

You Li

Dennis L MacDonald

Marcus Cornelis Van Meel

Raimundo De Heer Galisteo

Ronald S Doles

Shiguang Sun

Lei Sui

Lihua Lin

Jia Wu

Huaizhou Liao

Qing Qing Yuan

Duo L Li

Derek Zheng

Hui Zheng

Qun Dong

Huojun Long

Yun Fei Duan

Mingdong Yu

Luna X Zhang

Xiaofeng Zhang

James L Thomas

Matt J Ma

Biwen Xu

Wen Ran

Yumei Lu

Ken K Li

Yuangiang Liu

Ace Li

Gu Yuan Chen

Jinhai Xiao

Hong Bo Wang

Gang K Wang

Kun Hou

Gang G Wang

Kaihong Huang

In order to reduce energy loss of a tapped linear driver, it is proposed an LED lighting circuit, comprising an input (Vbus, GND) adapted to receive an input voltage, a plurality of LED segments (LED, LED, LED, LED) connected in series and to the input, a buffer component (C) connected to an anode and a cathode of a series string of at least two of the plurality of LED segments with respective switches, a current source circuit (B) in series connection with a parallel connection of the buffer component (C) and the at least two LED segments, across the input; further comprising a further buffer component (C) across the current source circuit (B), wherein said buffer component (C) and the further buffer component (C) is in series connection.

LED lighting circuit and a lighting device comprising the same

Provided is a method for detecting the presence of bacterial spores by measuring adenosine diphosphate (ATP) production over time. Spores are detected by converting adenosine monophosphate (AMP) and adenosine diphosphate (ADP) to ATP.

Rapid approach for detection of bacterial spores

A LED lighting circuit has a plurality of LED segments connected in series. A switching arrangement is used to selectively bypass at least one LED segment to implement a tapped linear driver approach. Degrading of a component in the LED lighting circuit is detected, so that a first TLD current modulation scheme is implemented when no such degrading is detected whereas a second current modulation scheme, different from the first current modulation scheme, is implemented to compensate for said degrading. Said degrading is leading to an increase in a turning on voltage of one LED segment, and compared to said first current modulation scheme, said second current modulation scheme has a higher voltage threshold at which said LED segment is switched. In this way, protection may be provided for circuit components and the light output may be maintained at the desired level in the event of component degrading, such as LED chip failure or contact resistance changes.

Tapped linear driver and driving method

A lighting driver is for receiving an alternating current power supply from a fluorescent lighting ballast. A shunt device is provided for selectively shunting the power supply to implement dimming control. A detector is provided for generating a detection signal and for providing the detection signal to the control circuit to operate the shunt device. The detector has a detection circuit for analyzing a voltage at the driver input and generating 5 the detection signal accordingly, when the voltage is detected. In addition, for situations where the voltage detection does not correctly generate the detection signal, a correction circuit generates the detection signal for a time delay from the end of operating the shunt device. This prevents control stability problems at low dimming levels.

Lighting drive, lighting system and control method

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.

Electronic ballast interface circuit

A retrofit lamp is to be used with a ballast. A shunt switch is provided in parallel with an output load and is adapted to shunt input terminals of the lamp using pulse width control so as to tune the current through the lighting element. This current control is used to enable compatibility with different ballasts and to provide dimming control. A detection circuit is used to detect an abnormal drive condition of the retrofit lamp and the pulse width control of the shunt switch can then be overridden by holding the shunt switch at a stable state for a certain duration. This prevents overload conditions and avoids DC signals in the event of component failures.

Retrofit lamp and a lighting system using the same

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.

Retrofit light emitting diode, LED, tube for reducing audible noise originating from a high frequency electronic ballast

The present application discloses a sizing method for making paper. An alkenyl succinic anhydride (ASA) is added to a papermaking process. An aluminum salt is added in one or more process steps during the papermaking process. Preferably, the aluminum salt is an aluminum salt which can generate free aluminum ion in aqueous solution. The sizing method of the present application enhances the usage efficiency of a sizing agent and the aluminum salt, as well as provides paper having a high moisture content.

Sizing method for making paper and paper prepared thereof

A load driver for driving a load and an LED module are disclosed. In one embodiment, the load driver comprises a converter circuit comprising a controllable switching element configured to be turned on and off and to perform power factor correction for power from a power supply to the load, wherein a control terminal of the controllable switching element is configured for receiving a startup current via the two output terminals, the controllable switching element configured to be turned on by the startup current. The converter circuit further comprises a first inductor, coupled to the power supply at a first end, and to ground at a second end via the controllable switching element, wherein a first one of the output terminals connects to a second end of the first inductor via a diode forwarded from the first inductor, a second one of the output terminals is coupled to the first end of the first inductor.

Driver with open output protection

The invention provides an electrical device, comprising a transformer () with a ferrite core () and an RF antenna (). The antenna () is electrically isolated from said transformer (), and a geometric dimension of the antenna () has a maximum dimension along or around a surface of the RF antenna (i.e. within the plane of the antenna or around a curved surface defining the antenna), and the RF antenna () is spatially spaced from a nearest part of the ferrite core () by less than the maximum dimension. This design makes use of the ferrite core of a transformer to provide isolation of the antenna from other parts of the device. This assists in reducing the impact of those parts of the device on the performance of the antenna, in particular the reception range.

Device with an antenna

The present invention discloses a method for detackifying organic contaminants in the process of pulping and papermaking and a composition used for the same. Specifically, the invention discloses that the water circulation system of pulping and papermaking process can be provided with non-ionic cellulose ether and cationic coagulant in lower amount, through which, the deposition of organic contaminants can be inhibited under the synergistic action of pre-coagulation and detackification.

Method and composition for detackifying organic contaminants in the process of pulping and papermaking

The invention describes a coded light modulation arrangement (), adapted to be connected between a driver () and a LED (), which coded light modulation arrangement () comprises input terminals () adapted to connect to the driver () and to receive a drive current (I), an energy storage arrangement comprising a number of energy storage devices (EE); a data input interface () realized to receive a data stream (D), said data stream (D) comprises a sequence of binary symbols comprising a logic high and a logic low; a switch arrangement comprising a number of switches (SS) arranged to connect the energy storage devices (EE) of the energy storage arrangement and to modulate the drive current such that, in a charging switch configuration corresponding to the logic low, a negative modulation current (I) is diverted from a drive current (I) of the LED () to the energy storage arrangement; and, in a discharging switch configuration corresponding to the logic high, a positive modulation current (I) is drawn from the energy storage arrangement and added to the drive current (I) of the LED (); and output terminals () adapted to connect to the LED () and to provide the modulated drive current directly to the LED () to emit the low and high radiant flux level as coded light (L) to be received by a photosensor of a coded light receiver device. The invention further describes a method of performing coded light modulation for light emitted by a LED (); a luminaire; and a coded light communication arrangement ().

Coded light modulation arangement

The present invention provides a method for preserving recycled fiber by using biocides and a method for manufacturing paper using recycled fiber. The method for manufacturing paper, using recycled fiber as a raw material, comprises pulping procedure: pulping the raw material containing recycled fiber, and papermaking procedure: producing the paper with the pulp slurry obtained in the pulping procedure; wherein the total starch content of recycled fiber is measured before recycled fiber is pulped, and when the total starch content of recycled fiber is higher than a predetermined value, one or more biocides are added during the pulping procedure.

Method for preserving recycled fiber by using biocides in paper manufacturing and method for manufacturing paper using recycled fibers

A lighting circuit uses a tapped linear driver architecture in which there are at least two LED types; a first LED type with a first forward voltage, and a second LED type with a second forward voltage at least double the first forward voltage. The first segment of the tapped linear driver comprises more LEDs of the first type than the second type and the last segment comprises more LEDs of the second type than the first type. This arrangement enables a reduction in the number of LEDs needed, but without significantly impacting on the efficiency of the circuit.

LED arrangement and LED driving method

Presented is a converter circuit having main switching circuiton a primary side of a transformer, for controlling supply of a current to a storage inductor on the primary side when the main switching circuit is conductive. The convertor circuit comprises: a control circuit operatively coupled to the main switching circuit and for controlling the main switching circuit, the control circuit comprising a control capacitor adapted to enable the control circuit and turn off the main switching circuit; an auxiliary inductor magnetically coupled to the storage inductor and adapted to trigger the control circuit to operate and turn off the main switching circuit in response to a voltage change in the storage inductor when the main switching circuit being conductive; and a charging circuit coupled between the auxiliary inductor and the control capacitor and adapted to enable the auxiliary inductor to charge the control capacitor. The charging circuit comprises first and second charging paths within the primary side between the auxiliary inductor and the control capacitor, the first charging path being conductive and the second charging path being conductive when a voltage across the auxiliary inductor is above a threshold value.

Power supply circuit with converter circuit

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Shanghai, China

Zhi Quan Chen