Abstract: Radar-based motion detection systems are widely used in smart home, smart building, and smart city area for automatic control. In this invention, methods, subsystem, systems, computer program are disclosed to achieve power reduction of a radar sensor by operating the radar sensor in a sub-sampling manner in an illumination control system. By combining the information related to the detection area and the state of a lighting device, the sampling frequency of a radar sensor is configured according the user scenario. A balance between power reduction and motion detection performance is achieved therefrom.

Abstract: A resonant inverter for a resonant converter, comprising a switch network and a resonant tank circuit. The switch network is controlled by a control circuit, which is responsive to a sampled electrical feedback parameter provided by the resonant tank circuit. The value of the sampled electrical feedback parameter or the time of sampling the electrical feedback parameter is modified in response to a measured time delay between the control circuit indicating a desire to change a switching state of the switch network, and the output of the switch network responding to this desire.

Abstract: A driver for driving a load, wherein the driver comprises a dual-boost converter comprising an output capacitance comprising a first output capacitor connected in series with a second output capacitor, a first switch connected to a power input stage via a first inductor and arranged for controlling charging of said first output capacitor via a first diode and a second switch, connected in series with said first switch, and connected to the power input stage via a second inductor and arranged for controlling charging of said second output capacitor via a second diode; wherein a centre tap of said in series connected first and second output capacitor is connected to a centre tap of said in series connected first and second switch.

Abstract: A LED driver having a current sensing resistor arrangement with two parallel current sensing branches, each comprising at least two series resistors connected at a respective sensing node. The voltages at the two sensing nodes are processed to detect a component failure. The normal current control is based on the voltage across the overall resistor arrangement.

Abstract: Radar-based motion detection systems are widely used in smart home, smart building, and smart city area for automatic control. In this invention, methods, subsystem, systems, computer program are disclosed to achieve power reduction of a radar sensor by operating the radar sensor in a sub-sampling manner in an illumination control system. By combining the information related to the detection area and the state of a lighting device, the sampling frequency of a radar sensor is configured according the user scenario. A balance between power reduction and motion detection performance is achieved therefrom.

Abstract: A resonant inverter for a resonant converter, comprising a switch network and a resonant tank circuit. The switch network is controlled by a control circuit, which is responsive to a sampled electrical feedback parameter provided by the resonant tank circuit. The value of the sampled electrical feedback parameter or the time of sampling the electrical feedback parameter is modified in response to a measured time delay between the control circuit indicating a desire to change a switching state of the switch network, and the output of the switch network responding to this desire.

Abstract: The invention provides a conversion circuit for converting first signals coming from a fluorescent ballast into second signals for feeding a light circuit via a rectifier circuit, the light circuit comprising at least one light emitting diode. The conversion circuit has an inductor in a parallel branch between the two-terminal input or the two-terminal output. This enables the ballast output power be reduced without significant increase in losses. The conversion circuit is for enabling retrofit of LEDs to fluorescent ballasts.

Abstract: The present invention relates to a functional device (10A) with improved power conversion efficiency. The functional device (10A) comprises a functional unit (12), two or more energy storage units (14A, 14B, 14C, 14D), and an electric power converter unit (16). The electric power converter unit (16) is configured to receive an input voltage from an external power source (20) and to provide converted input voltage to a charging set (28A) of the energy storage units (14C, 14D) which are connected in series with each other having a charging set voltage adapted to the input voltage received from the external power source (20). A discharging set (32A) of the energy storage units (14A, 14B) is configured to provide an output voltage adapted to a functional unit input voltage required by the functional unit (12) to the functional unit (12). This allows an improved power conversion efficiency.

Abstract: An AC/DC converter and conversion method are provided, in which an AC input is rectified and shaped by a waveform shaping capacitor. A current source circuit is used to provide the output current to the output load which has a parallel bulk capacitor. The current source circuit is switched on and off with timing which is dependent on the phase of the AC input signal. This enables a relatively high power factor, for example between 0.7 and 0.9, with low cost circuitry with few components.

Abstract: An AC/DC converter and conversion method are provided, in which an AC input is rectified and shaped by a waveform shaping capacitor. A current source circuit is used to provide the output current to the output load which has a parallel bulk capacitor. The current source circuit is switched on and off with timing which is dependent on the phase of the AC input signal. This enables a relatively high power factor, for example between 0.7 and 0.9, with low cost circuitry with few components.

Abstract: A lighting device (100) and a method of manufacturing a lighting device, wherein the lighting device comprises at least one light source (110) arranged to generate light. The lighting device further comprises a light-transmissive envelope (120) enclosing the at least one light source and being arranged to transmit the light generated from the light source. The lighting device further comprises a driver unit (130) arranged for electrical supply to the at least one light source, the driver unit comprising a primary driver circuit (140) connectable to an electric energy source, at least one secondary driver circuit (150) connected to the at least one light source, and a transformer (160) arranged to transfer electrical energy between the primary driver circuit and the at least one secondary driver circuit, wherein at least the transformer and the at least one secondary driver circuit driver unit are arranged within the envelope.

Abstract: Arrangements (1) for buffering energy comprise buffer capacitor circuits (10) with one or more buffer capacitors (11), first circuits (20) for guiding charging currents for charging the buffer capacitor circuits (10), and second circuits (30) with current source circuits (31-34) for defining amplitudes of de-charging currents for de-charging the buffer capacitor circuits (10), to better control the de-charging of the buffer capacitor circuits (10). The second circuits (30) may further comprise trigger circuits (51-53) for bringing the current source circuits (31-34) into activated modes, and latch circuits (61-63) for latching the current source circuits (31-34). The arrangements (1) may further comprise smoothing capacitor circuits (40) with one or more smoothing capacitors (41). The buffer capacitor circuits (10) may be coupled serially to the first circuits (20), and the first and second circuits (20, 30) may be coupled in parallel to each other.

Abstract: A high voltage transformer (50) includes a magnetic core (5); a low voltage winding (10); a high voltage winding (20); at least one inner sleeve (30); and a coil bobbin (24) for carrying the high voltage winding (20). The coil bobbin (24) is configured to be arranged inside the at least one inner sleeve (30) and configured to be attached to the at least one inner sleeve (30) at an outer perimeter of the at least one inner sleeve (30). The coil bobbin (24) includes at least one field-control electrode (22), which is adapted to shape an electric field generated by the high voltage winding (20).

Abstract: Non-linearities of a gradient amplifier (1) for powering a gradient coil (16) are caused by the finite dead time of the amplifier and/or by a forward voltage drop. The gradient amplifier (1) includes a controllable full bridge (8) and an output filter (9). The full bridge (8) is controlled to provide a desired coil current (ic), including receiving a desired duty cycle (aeff) of the gradient amplifier (1), measuring an input current (ifilt) and an output voltage (ucfilt) of the output filter (9), evaluating an modulator duty cycle (amod), and providing the modulator duty cycle (amod) for controlling the full bridge (8). The gradient amplifier (1) powers a gradient coil (16) including at least two half bridges (10), each having at least two power switches (11) connected in series. An output filter (9) connected to a tapped center points of the half bridges (10) between two the power switches (11).

Abstract: A lighting device (100) and a method of manufacturing a lighting device, wherein the lighting device comprises at least one light source (110) arranged to generate light. The lighting device further comprises a light-transmissive envelope (120) enclosing the at least one light source and being arranged to transmit the light generated from the light source. The lighting device further comprises a driver unit (130) arranged for electrical supply to the at least one light source, the driver unit comprising a primary driver circuit (140) connectable to an electric energy source, at least one secondary driver circuit (150) connected to the at least one light source, and a transformer (160) arranged to transfer electrical energy between the primary driver circuit and the at least one secondary driver circuit, wherein at least the transformer and the at least one secondary driver circuit driver unit are arranged within the envelope.

Abstract: A switch-mode power supply device (1) is disclosed. The switch-mode power supply device (1) has a main circuit (6) configured to receive a DC input voltage and to provide a DC output voltage. The main circuit (6) comprises: an inductor element (12) generating the DC output voltage, a switching element (9) connected to the inductor element (12), and a controller (7) configured to switch the switching element (9) between a conducting state and a non-conducting state, wherein the switching element (9) is configured to feed a pulsed direct current to a ground potential (10). The switch-mode power supply (1) also has an auxiliary circuit (16) configured to provide an auxiliary voltage. The auxiliary circuit (16) comprises an auxiliary inductor (18) connected to receive the pulsed direct current and magnetically isolated from the inductor element (12).

Abstract: In various embodiments a device and method for providing power to an LED unit and modulating light emitted from the LED unit is disclosed. In one example, the device is configured to be connected between a driver and the LED unit. In this example, the device comprises a controllable resistor that receives from the driver a driver output voltage and to provides a load current to power the LED unit, a frequency filter for providing a substantially constant voltage to the LED unit, the frequency filter being connected to the controllable resistor to provide a substantially constant electrical power to the LED unit, and a modulator coupled in series to the LED unit for modulating the drive current and for modulating the emitted light output, wherein the substantially constant voltage applied to the LED unit is further applied to the modulator by means of the frequency filter.

Abstract: A state space feedback controller operates in the digital domain for the regulation of the current supply to MRI gradient coils from a multiple-bridge PWM power amplifier. The P1-controller includes an integration part (for the integration of the difference between the demand current and the measured gradient coil current) and a subsequent P-controlled system which in turn includes a delay compensator/stabilizer and a plant. The delay compensator/stabilizer includes a multi-path feedback loop by means of which its digital output signal is fed back through delay blocks, on the one hand, and through filter units, on the other hand. The filter units model the transfer functions of a gradient coil output filter for the gradient coil voltage and the output current of the amplifier inverter units, respectively. In the plant, a filter unit, which models the gradient coil transfer function, is connected in series to a delay chain for the delay of the measurement value of the gradient coil current.

Abstract: Arrangements (1) for buffering energy comprise buffer capacitor circuits (10) with one or more buffer capacitors (11), first circuits (20) for guiding charging currents for charging the buffer capacitor circuits (10), and second circuits (30) with current source circuits (31-34) for defining amplitudes of de-charging currents for de-charging the buffer capacitor circuits (10), to better control the decharging of the buffer capacitor circuits (10). The second circuits (30) may further comprise trigger circuits (51-53) for bringing the current source circuits (31-34) into activated modes, and latch circuits (61-63) for latching the current source circuits (31-34). The arrangements (1) may further comprise smoothing capacitor circuits (40) with one or more smoothing capacitors (41). The buffer capacitor circuits (10) may be coupled serially to the first circuits (20), and the first and second circuits (20, 30) may be coupled in parallel to each other.

Abstract: The invention relates to a high voltage transformer (50) comprising: a magnetic core (5); a low voltage winding (10); a high voltage winding (20); at least one inner sleeve (30); and a coil bobbin (24) for carrying the high voltage winding (20), wherein the coil bobbin (24) is configured to be arranged inside the at least one inner sleeve (30) and configured to be attached to the at least one inner sleeve (30) at an outer perimeter of the at least one inner sleeve (30); and wherein the coil bobbin (24) comprises at least one field-control electrode (22), which is adapted to shape an electric field generated by the high voltage winding (20).