An isolated converter has a transformer with a primary winding (in a primary side circuit) and a secondary winding magnetically coupled to the primary winding. A first Y-capacitor is electrically connected between the primary side circuit and the secondary winding. The detection circuit is for detecting information at the primary side, preferably information about the input supply received at the input, and more preferably the information is that whether the input supply is an alternating current (AC) supply or a direct current (DC) supply, and the detection circuit includes the first Y-capacitor. The detection circuit enables the detected information to be provided directly to a secondary side controller, without needing opto-isolators or other isolated data transmission. The detection circuit (20) comprises a capacitor divider comprising the first Y-capacitor (C5), and further comprising a second impedance and a third capacitor (C7) connected in series with the first Y-capacitor (C5), with the first Y-capacitor (C1), the second impedance, and the third capacitors (C5, C6, C7) in series between a primary side ground (PGND) and the input (12), wherein the detection circuit is for detecting a voltage across a second impedance to obtain a signal indicating the information at the primary side. Preferably the second impedance comprises a second capacitor (C6).

A lamp driver delivers an output voltage and output current to a lamp load. A current regulating circuit at a secondary side provides a feedback signal for use by the driver when in a current regulation mode. An overvoltage protection circuit detects an overvoltage condition of an output voltage and modulates the feedback signal during detection of the overvoltage condition. The overvoltage condition can then be recognized more easily based on the resulting modulation of the output voltage.

A lamp driver delivers an output voltage and output current to a lamp load. A current regulating circuit at a secondary side provides a feedback signal for use by the driver when in a current regulation mode. An overvoltage protection circuit detects an overvoltage condition of an output voltage and modulates the feedback signal during detection of the overvoltage condition. The overvoltage condition can then be recognized more easily based on the resulting modulation of the output voltage.

A luminaire driver system comprising: a package with input connections for connection to a power supply and output connections for connection to a light emitting device; a predetermined set of circuits arranged in said package; said predetermined set of circuits being adapted to perform a driving functionality of the light emitting device; a receiving means configured for receiving a pluggable module comprising a further circuit, such that the pluggable module can be received from outside of the package, wherein the further circuit is connected to the predetermined set of circuits when the pluggable module is plugged in the receiving means; and connections which are connected to the further circuit when the pluggable module is plugged in the receiving means; wherein the connections are accessible by a user from outside of the package.

A method of initiating power-on of a light driver for driving a light source, the method including retrieving a stored load voltage of the light driver from a memory, determining a turn-on delay based on the stored load voltage, stalling power-on of the light driver for a period of time equal to the turn-on delay, initiating startup of the light driver based on the stored load voltage, determining whether current is flowing to the light source, in response to determining that current is flowing to the light source, measuring a load voltage of the light driver, and storing the load voltage in the memory.

A LED driving arrangement has a main converter stage and a power commutation stage in parallel with an LED unit. An energy divert mode of operation is used during which a set current is provided to the LED unit, and the main converter stage is used to deliver a current larger than the set current. The power commutation stage is used to divert energy from the LED unit and return the diverted energy to an input to the main converter. The remaining set current is delivered to the LED unit. This enables deeper dimming than the dimming level applied to the main converter stage, but without requiring an additional switch mode power converter.

A LED driving arrangement has a main converter stage and a power commutation stage in parallel with an LED unit. An energy divert mode of operation is used during which a set current is provided to the LED unit, and the main converter stage is used to deliver a current larger than the set current. The power commutation stage is used to divert energy from the LED unit and return the diverted energy to an input to the main converter. The remaining set current is delivered to the LED unit. This enables deeper dimming than the dimming level applied to the main converter stage, but without requiring an additional switch mode power converter.

The invention relates to an isolated primary side switched converter (100), comprising a galvanic isolation stage (105) separating a primary side (101) and a secondary side (103) of the converter (100), a secondary side winding (107) of the isolation stage (105), wherein the secondary side winding (107) is coupled to a primary side winding, and wherein the secondary side winding (107) comprises a center tap, a first terminal (T1), a second terminal (T2) and a third terminal (T3) for connecting an LED load (LED1, LED2) on the secondary side (103) of the converter (100), a rectification circuit (109) on the secondary side (103) of the converter (100), wherein the rectification circuit (109) is configured to set the first terminal (T1) at a first electrical polarity, and to set the second and the third terminal (T2, T3) at a second electrical polarity that is different to the first electrical polarity, wherein the third terminal (T3) is electrically connected to the center tap, and wherein a voltage between the first and the second terminal (T1, T2) is larger than a voltage between the first and the third terminal (T1, T3).

The invention relates to an isolated primary side switched converter (100), comprising a galvanic isolation stage (105) separating a primary side (101) and a secondary side (103) of the converter (100), a secondary side winding (107) of the isolation stage (105), wherein the secondary side winding (107) is coupled to a primary side winding, and wherein the secondary side winding (107) comprises a center tap, a first terminal (T1), a second terminal (T2) and a third terminal (T3) for connecting an LED load (LED1, LED2) on the secondary side (103) of the converter (100), a rectification circuit (109) on the secondary side (103) of the converter (100), wherein the rectification circuit (109) is configured to set the first terminal (T1) at a first electrical polarity, and to set the second and the third terminal (T2, T3) at a second electrical polarity that is different to the first electrical polarity, wherein the third terminal (T3) is electrically connected to the center tap, and wherein a voltage between the first and the second terminal (T1, T2) is larger than a voltage between the first and the third terminal (T1, T3).

A circuit comprises a first printed circuit board (60) carrying a first set of components and a second printed circuit board (62) carrying a second set of components, with a clearance (64) between the first and second printed circuit boards. A transformer (66) has a primary side connected to the first set of components and a secondary side connected to the second set of components. One of the transformer windings, and its connection to a respective set of components, comprises a triple insulated wire. A glass, ceramic or mica spacer (70) mounted to the first and second printed circuit boards defines and sets the clearance (64) between the first and second printed circuit boards. The clearance requirement is met by providing separate printed circuit boards with spacing between them and the use of a triple insulated wire addresses or overcomes issues of creepage. Thus, high frequency and high voltage operation on the first printed circuit board is possible.