Abstract: A circuit arrangement includes a half-bridge with a high-side switch and a low-side switch, each switch including a control terminal and a load path. The load paths of the high-side switch and the low-side switch are coupled in series between a terminal for a supply potential and a terminal for a reference potential a high-side driver operable to provide a high-side drive signal received at the control terminal of the high-side switch. The high-side driver includes supply terminals a charge storage device coupled between the supply terminals of the high-side driver. A control circuit includes a charging circuit, a switching element and a drive circuit operable to switch on the switching element dependent on at least one operation parameter of the circuit arrangement.

Abstract: Stand, in particular camera stand, comprising: a receptacle for mounting an apparatus, in particular a camera; and at least one leg which is connected to the receptacle and comprises at least two telescopic units (T1, T2), of which a first telescopic unit (T1) is connected to the receptacle and a second telescopic unit (T2) is displaceable relative to the first telescopic unit and can be locked in a desired position in relation to the first telescopic unit (T1), characterized in that two locking points set apart in the longitudinal direction of the leg are provided between the second telescopic unit (T2) and the first telescopic unit (T1) for locking the telescopic units (T1, T2).

Abstract: The invention relates to a control circuit and a corresponding method for controlling MOSFETs coupled to the control circuit. The MOSFETs are coupled to a load to couple the load to a power supply, or the MOSFETs are coupled to a generator. In case of inverted polarity, the control circuit switches the MOSFETs to their conducting state to prevent damaging the MOSFETs.

Abstract: An embodiment of the invention relates to a driver adapted to provide a drive signal with an adjustable waveform for an external bridge to control EMI. The driver includes a detector configured to measure a switching characteristic of a switch in the external bridge to produce the drive signal with an adjustable waveform characteristic. The driver includes an adjustable circuit element to adjust the waveform characteristic in response to the measured switching characteristic. The measured switching characteristic may be a derivative of a voltage of the switch in the bridge such as a derivative of a drain-to-source voltage of a half-bridge circuit. The driver may be formed with an amplifier with an adjustable gain controlled by the signal produced by the detector. The adjustable gain amplifier may be formed with a transistor coupled in series with a leg of a current mirror.

Abstract: Stand, in particular camera stand, comprising: a receptacle for mounting an apparatus, in particular a camera; and at least one leg which is connected to the receptacle and comprises at least two telescopic units (T1, T2), of which a first telescopic unit (T1) is connected to the receptacle and a second telescopic unit (T2) is displaceable relative to the first telescopic unit and can be locked in a desired position in relation to the first telescopic unit (T1), characterised in that two locking points set apart in the longitudinal direction of the leg are provided between the second telescopic unit (T2) and the first telescopic unit (T1) for locking the telescopic units (T1, T2).

Abstract: The invention relates to a control circuit and a corresponding method for controlling MOSFETs coupled to the control circuit. The MOSFETs are coupled to a load to couple the load to a power supply, or the MOSFETs are coupled to a generator. In case of inverted polarity, the control circuit switches the MOSFETs to their conducting state to prevent damaging the MOSFETs.

Abstract: An embodiment of the invention relates to a driver adapted to provide a drive signal with an adjustable waveform for an external bridge to control EMI. The driver includes a detector configured to measure a switching characteristic of a switch in the external bridge to produce the drive signal with an adjustable waveform characteristic. The driver includes an adjustable circuit element to adjust the waveform characteristic in response to the measured switching characteristic. The measured switching characteristic may be a derivative of a voltage of the switch in the bridge such as a derivative of a drain-to-source voltage of a half-bridge circuit. The driver may be formed with an amplifier with an adjustable gain controlled by the signal produced by the detector. The adjustable gain amplifier may be formed with a transistor coupled in series with a leg of a current mirror.

Abstract: A spring arm (1) for a camera body support is provided with a parallelogram guide (3, 5) which is made up of two opposing legs (10, 11) disposed parallel to one another and two likewise opposing connecting elements (12, 13) that connect the respective ends of the legs (10, 11) with one another, and an energy storage mechanism (15), which is supported on two pivot points (17, 19) on the parallelogram guide (3, 5), in order to compensate a load acting on the parallelogram guide (3, 5). At least one (19) of these pivot points (17, 19) is adjustable in relation to the parallelogram guide (3, 5) such that both the energy storage mechanism's (15) pretension and also its action of force direction change.

Abstract: Disclosed is a multiple telescopic tube comprising at least two parallel outer tubes (1), at least two inner tubes (2) which are disposed parallel to the outer tubes (1) and are movable relative to said outer tubes (1) in a longitudinal direction (Z), and a clamping device (3) which is provided with a clamping engagement element (5) that can be made to engage with the exterior surfaces of the inner tubes (2). The clamping device (3) prevents displacement of the inner tubes (2) relative to the outer tubes (1) in a longitudinal clamping direction while the inner tubes (2) remain movable in the opposite longitudinal direction when the multiple telescopic tube is subjected to a load in said longitudinal clamping direction. The inventive multiple telescopic tube can be used as a leg of a camera stand, for example.

Abstract: A spring arm (1) for a camera body support is provided with a parallelogram guide (3, 5) which is made up of two opposing legs (10, 11) disposed parallel to one another and two likewise opposing connecting elements (12, 13) that connect the respective ends of the legs (10, 11) with one another, and an energy storage mechanism (15), which is supported on two pivot points (17, 19) on the parallelogram guide (3, 5), in order to compensate a load acting on the parallelogram guide (3, 5). At least one (19) of these pivot points (17, 19) is adjustable in relation to the parallelogram guide (3, 5) such that both the energy storage mechanism's (15) pretension and also its action of force direction change.

Abstract: The invention relates to a camera crane comprising a support (1) and a jib (2). A traction rope (9) of a control system is movable on a pivot bearing of the crane jib in order to establish a parallelogram system or displace said parallelogram system. The rope is also movable in the longitudinal direction thereof in order to be able to preadjust the angle at which camera-receiving plate is positioned.

Abstract: The invention relates to a camera crane which comprises a crane jib (2) at the end of which a camera receiving platform (30) is pivotably mounted with dampening elements (34) interposed between. In this manner, the oscillations that are caused by a traction and control rope (9) expanding under the load of the camera can be dampened, thereby allowing a perfect operation of the camera.

Abstract: The invention relates to a telescopic stand comprising at least three telescopic units per stand leg, wherein a clamping device which can be actuated via just one clamping lever per stand leg is provided at two fixing locations (A, B) of the central stand unit. For this purpose, the clamping device is connected together at the two fixing locations (A, B) by an actuating bar (42). This considerably simplifies the stand's handling in that far fewer clamping levers with respect to the prior art have to be actuated.

Abstract: The invention relates to a telescopic stand comprising at least three telescopic units per stand leg, wherein a clamping device which can be actuated via just one clamping lever per stand leg is provided at two fixing locations (A, B) of the central stand unit. For this purpose, the clamping device is connected together at the two fixing locations (A, B) by an actuating bar (42). This considerably simplifies the stand's handling in that far fewer clamping levers with respect to the prior art have to be actuated.

Abstract: The invention relates to a lifting apparatus with a carrying part (16, 18) which is connected via a cable (22) or the like with an actuating part for adjustment of the vertical position of the carrying part, in particular by means of interconnection of a pantograph (10), the actuating part comprising an actuating device with a gear transmission of which one transmission part, under the influence of the load of the carrying part (16, 18) or a load hanging from this, exerts a force on the other transmission part which couples this transmission part with an actuating element against a restoring force, wherein, upon actuation for the lifting of the carrying part (16, 18) out of the position in which the one transmission part does not exert any force on the other transmission part, the latter is moveable again into coupling engagement by means of the actuating element.