Philips Lighting Holding B.v.

Signify Holding B.v.

Duo L Li

Dennis Johannes Antonius Claessens

Chao Li

Zhi Quan Chen

Wouter Oepts

Kang Li

Hui Zhang

Matt J Ma

Haibo Qiao

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

Driver () for driving a load (L), the driver having BiFRED topology and comprising: &#x2014;a first input terminal () and a second input terminal (); a pair of output terminals () for connecting the load; &#x2014;a Bi FRED converter coupled to the input terminals, comprising: &#x2014;a first inductor (L), coupled to a first input terminal (); &#x2014;a first capacitor (C) in series connection with the first inductor; &#x2014;a controllable switch (S) between the interconnection of the first inductor and the first capacitor and the second input terminal (); &#x2014;a second inductor (L) coupled between the first capacitor and the second input terminal; &#x2014;a control device ()for controlling the controllable switch (S); wherein said control device () comprises: &#x2014;a first sensing element () for sensing the current through said switch (S) and providing a first output signal proportional to said current, said current being the sum of the charging current of the first inductor (L) and discharging current of the first capacitor (C); &#x2014;a reference device () for providing a reference signal; &#x2014;comparing element for comparing said first output signal with said reference signal, and for switching said switch to a non-conductive state in each transition of the controllable switch's oscillation when said first output signal is equal to or higher than said reference signal; &#x2014;an output capacitor (C) connected between said output terminals (); &#x2014;a second diode (D) connected in series with said output capacitor (C); &#x2014;a second sensing element () for sensing the current through said second diode (D), and for providing a second output signal for switching said switch to a conductive state when said current through said second diode (D) reaches zero; wherein said second sensing element () comprises a sensing inductor () inductively coupled to said second inductor (L) wherein the sensing inductor () having one end connected to the second input terminal () and having its opposite end coupled to the control terminal of the controllable switch (S).

Driver for driving a load

A solid state lighting module is disclosed. In one example, the module comprises a light source and a resistor circuit, wherein an output resistance of the resistor circuit is for conveying to a connected driver information on a desired power to be applied to the solid state light source. A control interface is provided for receiving configuration information from an external configuration device and a control circuit configures the resistor circuit thereby to set the output resistance in response to received configuration information. This approach involves integrating the configuration function in the lighting module instead of in the driver. The output resistance can be determined by existing driver architectures without modification, while at the same time the ability of the user to tailor individual lighting modules to their needs is enabled.

Solid state lighting module, a lighting circuit and lighting control methods

Growing community of inventors

Eindhoven, Netherlands

Duo L Li