Abstract: A height adjustment device may include a height adjustment screw having outer threads and being oriented substantially vertically and arranged rotatably in relation to a chassis, and an adjustment nut connected to a bracket and comprising inner threads for engagement with the threads of the adjustment screw, such that a rotary movement of the height adjustment screw results in a vertical linear movement of the bracket. The adjustment nut may include a first part and a second part which together enclose the adjustment screw, and the first part may be adapted to be attached to the second part. A robotic mower may include the height adjustment device.

Abstract: A method for operating an ultrasonic measuring device for measuring a property of a medium includes: an arrangement of at least two pair of ultrasonic transducers for emitting and receiving ultrasonic signals across a signal path through a fluid; a holding apparatus having a wall in contact with the medium and a flat wall section for holding the ultrasonic transducers; an electronic circuit configured to operate the ultrasonic transducers and to provide measured values of the property, wherein the ultrasonic transducers form Lamb oscillations in the respectively associated wall, wherein at least two pair of the at least two pair of ultrasonic transducers each excite and capture different modes of Lamb oscillations, wherein the different modes are excited in groups, wherein a time delay between temporally adjacent emissions of ultrasonic signals is shorter than a shortest propagation time of the ultrasonic signals between associated ultrasonic transducers.

Abstract: A system (1) for attaching a display element (2) to a drive shaft (3) fitted to an analogue display mechanism of a measuring apparatus, the system (1) including a portion (6) for mounting the display element (2) made of a material that has the property of softening and an embeddable end piece (4a) of said drive shaft (3) configured to be incorporated into said portion (4a) by melting, said end piece (4a) including part of a peripheral wall (13) of the drive shaft (3) provided with a patterned outer bonding surface configured to mechanically anchor said end piece (4a) in said portion (6).

Abstract: A display element (1) intended to be fitted to a timepiece, including a body (2) provided with a portion (4) including an assembly area (5) configured to receive an insert (3) by embedding, the embeddable insert (3) being provided with a shaft hole (13) configured to adjust the display element (1) on a drive shaft, the body (2) including a portion (4) made of a material having the property of softening, in which the insert (3) is embedded by melting, the insert (3) including a peripheral wall (6) provided with a patterned outer surface (7a) for connection with the portion (4) of the body (2) of the display element (1), the outer surface (7a) being configured to ensure mechanical anchoring of the insert (3) in the portion (4), the peripheral wall (6) projecting, on either side respectively, from opposite faces of the portion (4) of the body (2).

Abstract: The invention concerns a converter circuit for providing a load current to a load, in particular to a lighting device such as a LED lighting module. The converter circuit comprises at least one switch configured to switch between a conducting state and a non-conducting state based on a switch control signal. A current sense circuit of the converter circuit generates a current sense signal based on a sensed current via the switch. Based on the current sense signal, a control circuit of the converter circuit generates the switch control signal. The control circuit controls the switch to switch asynchronously from the conducting state to the non-conducting state when the current sense signal reaches a threshold value.

Abstract: The invention relates to a method (100) for operating an isolated primary side switched converter (300) for providing a voltage supply to an LED load (401), wherein the converter comprises a galvanic isolation stage (301), the method comprising the steps of: detecting (101) a feedback signal at a primary side of the galvanic isolation stage (301), wherein the feedback signal corresponds to a secondary side voltage, determining (103) an LED supply voltage based on the feedback signal, calculating (105) a threshold value based on a constant reference voltage and an adjustment factor, wherein the adjustment factor is a dynamic factor whose absolute value increases with increasing LED current, and interrupting (107) the voltage supply to the LED load (401) if the determined LED supply voltage exceeds the threshold value.

Abstract: The invention relates to a control system (1) for controlling a current source (4) of an operating device (10) for lighting means (5). The current source (4) is configured to provide a current (ILM) to the lighting means (5). The operating device (10) comprises a bus interface (8) electrically connectable to a digital bus (7) and a voltage supply circuit (3) for providing a supply voltage (V1) to electrically supply the bus interface (8) and the current source (4). The control system (1) is configured to perform a feedback control of the current (ILM) with regard to a reference current (Iref1, Iref2), and determine whether a communication via the bus interface (8) is present or not.

Abstract: The invention relates to an isolated resonant primary side switched converter (100), comprising a galvanic isolation stage (105), an auxiliary winding (L51-c) on the primary side (101) of the isolation stage (105) which is magnetically coupled to at least one secondary side winding (L51-b, L51-d) of the isolation stage (105), wherein the auxiliary winding (L51-c) is configured to detect a feedback signal as to a secondary side voltage, and a control unit (107) configured to sample the feedback signal, in each or every nth switching cycle, during a sampling period in which a current is flowing on the secondary side (103) of the isolation stage (105), and to process the sampled signal for a feedback control of the secondary side voltage by controlling the switching operation of a primary side switch (M40, M41).

Abstract: A self-propelled robotic lawnmower may include a lawnmower body, a body part movably arranged in relation to the lawnmower body, and an elongated sensor element extending in an interface between the lawnmower body and the body part. The elongated sensor element may be configured to generate a signal when a portion of the elongated sensor element is subjected to a change in thickness in a direction perpendicular to a direction of elongation of the elongated sensor element by a relative movement between the body part and the lawnmower body.

Abstract: A power tool (1) is disclosed comprising a tool (3), a power source (5) arranged to power the tool (3), a throttle lever (7), a circuit board (9), and a human machine interface (10) comprising components (15, 17, 19) arranged on the circuit board (9). The power tool (1) further comprises a magnet (11) operably connected to the throttle lever (7), and a sensor arrangement (13) configured to sense the intensity of the magnetic field of the magnet (11). The sensor arrangement (13) is arranged on the circuit board (9).

Abstract: A method that is for manufacturing a timepiece provided with a personalized decoration, visible in particular when the timepiece is worn, includes constructing the timepiece and producing the personalized decoration on all or part of a body of the timepiece. Producing the personalized decoration includes selecting from a human-machine interface of an electronic device a single portion of a reference digital graphical representation, in particular of an ephemeral reference digital graphic representation, and applying a coating of decorative material on all or part of the body of the timepiece as a function of the descriptive characteristics of the selected single portion.

Abstract: The invention relates to an isolated converter (100) for providing a current supply to an LED load, comprising: a galvanic isolation stage (101); a sensing circuit (103) on a primary side of the isolation stage (101), which is magnetically coupled to a secondary side of the isolation stage (101); wherein the sensing circuit (103) is configured to receive a feedback signal that is proportional to a secondary side current; and a control unit (105) configured to determine an output current of the converter (100) based on the feedback signal; wherein at least one electrical characteristic of the sensing circuit (103) and/or the control unit (105) is adjustable to convert the feedback signal from a first ratio to a second ratio to the secondary side current.

Abstract: A sealing member (2), for waterproof sealing of a volume, comprises a hollow, generally cylindrical body and a sealing area (5a, 5b) at the respective axial ends thereof. At least one sealing area (5a) comprises a first radially extending portion (6) and a second portion (7) extending in a reverse direction partly overlapping the first portion. The second portion (7) has a free end and is arranged for pressing towards the first portion (6), thereby forming a seal with the first portion (6). A sealing system comprises a sealing member (2) as above, a sealing seat (9) for abutment against the sealing member (2), and a counterpart surface (11), for pressing the sealing member (2) against the sealing seat (9). The sealing seat (9) comprises an inclined surface (10). A work tool (1) comprising the above-mentioned sealing system has at least one sealing area (5a) of the sealing member (2) pressed between a housing (4) and a chassis (3) of the work tool (1).

Abstract: The invention relates to an LLC stage for an LED driver (100), comprising a half bridge or full-bridge circuit (100a) comprising two switches (M40, M41), connected in series, a control circuitry (100e), such as e.g. a microcontroller or ASIC, for controlling switching operations of the switches (M40, M41), wherein the control circuitry (100e) for switches is arranged to monitor the middle point voltage between the two switches (M40, M41) and enables the switch on of one of the switches (M40, M41) only if the middle point voltage meets defined criteria. The control circuitry (100e) is designed to issue an error signal, if a dead time, during which both switches are non-conducting and resulting from the monitoring of the midpoint voltage, is greater than a preset threshold value.

Abstract: The invention relates to a synchronous flyback converter (100) having terminals for supplying an LED load. The synchronous flyback converter (100) comprises a sensing winding (Lw) coupled to a primary winding (Lp) of a transformer T of the flyback converter (100), a control unit (106) controlling a primary side switch (S1) in series to the primary winding (Lp) of the flyback converter (100) using a feedback signal for a closed loop control of a secondary side voltage of the flyback converter (100) by controlling the frequency and/or duty cycle of the switching of the primary side switch (S1), wherein the feedback signal is derived from a sensing voltage across the sensing winding (Lw) sampled once during a switch-on time of a secondary side switch (S2) of the flyback converter (100).

Abstract: The invention relates to an LED-driver, comprising an actively switched PFC circuitry and a bus interface for a wire-bound bus, wherein a voltage supply for the bus interface for powering the bus is tapped off the output voltage of the active PFC circuitry, further comprising a control circuitry for a feedback control of an output voltage of the actively switched PFC by controlling a switch of the PFC, wherein the time constant of the feedback control of the control circuitry is faster during time periods in which the bus interface is transmitting or receiving signals, compared to time periods without activity.

Abstract: The invention relates to an isolated converter (100) for providing a current supply to an LED load, comprising: a galvanic isolation stage (101); a sensing circuit (103) on a primary side of the isolation stage (101), which is magnetically coupled to a secondary side of the isolation stage (101); wherein the sensing circuit (103) is configured to receive a feedback signal that is proportional to a secondary side current; and a control unit (105) configured to determine an output current of the converter (100) based on the feedback signal; wherein at least one electrical characteristic of the sensing circuit (103) and/or the control unit (105) is adjustable to convert the feedback signal from a first ratio to a second ratio to the secondary side current.

Abstract: The invention relates to a method (100) for operating an isolated primary side switched converter (300) for providing a voltage supply to an LED load (401), wherein the converter comprises a galvanic isolation stage (301), the method comprising the steps of: detecting (101) a feedback signal at a primary side of the galvanic isolation stage (301), wherein the feedback signal corresponds to a secondary side voltage, determining (103) an LED supply voltage based on the feedback signal, calculating (105) a threshold value based on a constant reference voltage and an adjustment factor, wherein the adjustment factor is a dynamic factor whose absolute value increases with increasing LED current, and interrupting (107) the voltage supply to the LED load (401) if the determined LED supply voltage exceeds the threshold value.

Abstract: The invention relates to an isolated resonant primary side switched converter (100), comprising a galvanic isolation stage (105), an auxiliary winding (L51-c) on the primary side (101) of the isolation stage (105) which is magnetically coupled to at least one secondary side winding (L51-b, L51-d) of the isolation stage (105), wherein the auxiliary winding (L51-c) is configured to detect a feedback signal as to a secondary side voltage, and a control unit (107) configured to sample the feedback signal, in each or every nth switching cycle, during a sampling period in which a current is flowing on the secondary side (103) of the isolation stage (105), and to process the sampled signal for a feedback control of the secondary side voltage by controlling the switching operation of a primary side switch (M40, M41).

Abstract: The invention relates to an LED-driver, comprising an actively switched PFC circuitry and a bus interface for a wire-bound bus, wherein a voltage supply for the bus interface for powering the bus is tapped off the output voltage of the active PFC circuitry, further comprising a control circuitry for a feedback control of an output voltage of the actively switched PFC by controlling a switch of the PFC, wherein the time constant of the feedback control of the control circuitry is faster during time periods in which the bus interface is transmitting or receiving signals, compared to time periods without activity.