Abstract:
A circuit arrangement (3) is provided for operating at least one low-power lighting unit with a power supply (4) and in particular with a self-oscillating power supply. The circuit arrangement (3) comprises at least an input (12) for receiving an operating voltage (28) from said power supply (4) and an output (11) for connection to one or more low-power lighting units. To allow an efficient operation of said low-power lighting unit with the power supply (4), the circuit (3) comprises a pulse generator (17), connected with said input (12) and adapted to inject at least one trigger pulse (40a, 40b) into said power supply (4) during operation.
Abstract:
The invention relates to a circuit arrangement (1) for controlling at least one load (D1, D2, D3). In order to provide means for extracting an auxiliary power supply from a current source in order to control shunt switching, the inventive circuit arrangement (1) comprises an input terminal (11) for connection to a power supply (30), an output terminal (12) for connection to at least one load element (20, 21, 22, 23), a control circuit (10), comprising a control device (13), which is adapted to control at least one load element (20, 21, 22, 23), and an energy storage device (C), which is adapted to supply power to the control device (13). A controllable bypass switch (M4) is further provided, wherein said bypass switch (M4) and said control circuit (10) are connected in parallel and are connected between said input terminal (11) and said output terminal (12). The circuit arrangement (1) is adapted to operate the bypass switch (M4) to control the power provided to the control circuit.
Abstract:
A system comprises a power generator for generating electrical power and a switched capacitor converter for down-converting the output voltage of the power generator. The switched capacitor converter comprises a bank of capacitors and a switch arrangement. A controller is used for controlling the switches, based on a feedback signal from the power generator. This provides automatic control of the switched capacitor converter, thereby simplifying the overall control circuitry and improving efficiency.
Abstract:
The invention relates to a circuit arrangement (1) for controlling at least one load (D1, D2, D3). In order to provide means for extracting an auxiliary power supply from a current source in order to control shunt switching, the inventive circuit arrangement (1) comprises an input terminal (11) for connection to a power supply (30), an output terminal (12) for connection to at least one load element (20, 21, 22, 23), a control circuit (10), comprising a control device (13), which is adapted to control at least one load element (20, 21, 22, 23), and an energy storage device (C), which is adapted to supply power to the control device (13). A controllable bypass switch (M4) is further provided, wherein said bypass switch (M4) and said control circuit (10) are connected in parallel and are connected between said input terminal (11) and said output terminal (12). The circuit arrangement (1) is adapted to operate the bypass switch (M4) to control the power provided to the control circuit.
Abstract:
A first lighting device comprises an electromagnetic sensor operable to receive an electromagnetic signal from at least one other lighting device, an acoustic sensor operable to receive an acoustic signal from the other lighting device, and a signal processing module. The signal processing module is configured to determine a distance between the first lighting device and the other lighting device by comparing the acoustic and electromagnetic signals received from the other lighting device. For example, the signals may be emitted when the other device detects occupancy in a space, and the first device may control its light output in dependence on receipt of the signals and the distance from the device that detected the occupancy.
Abstract:
A circuit arrangement (3) is provided for operating at least one low-power lighting unit with a power supply (4) and in particular with a self-oscillating power supply. The circuit arrangement (3) comprises at least an input (12) for receiving an operating voltage (28) from said power supply (4) and an output (11) for connection to one or more low-power lighting units. To allow an efficient operation of said low-power lighting unit with the power supply (4), the circuit (3) comprises a pulse generator (17), connected with said input (12) and adapted to inject at least one trigger pulse (40a, 40b) into said power supply (4) during operation.
Abstract:
The invention provides a device for generating electrical currents of a particular desired waveform through the combining of a plurality of different frequency output currents generated by plurality of power generating arrangements. The power generating arrangements each comprise at least first and second sets of generating elements, configured to hold a relative charge and to be moveable with respect to one another in order to generate an electrical output current of a particular frequency.
Abstract:
Lighting device suitable for multiple voltage sources, comprising a first circuit (1) with diode circuits coupled to input terminals (2, 3) for receiving first voltage signals from first circuits (21) such as voltage-to-voltage converters. The diode circuits comprise diodes (11-14) for rectifying the first voltage signals and are coupled to output terminals (4, 5) for supplying second voltage signals. First capacitors (15) are coupled to the output terminals (4, 5) for buffering the second voltage signals and for offering buffered second voltage signals to second circuits (22) such as voltage-to-current-converts for feeding light circuits (30) comprising one or more light emitting diodes. Second capacitors (16, 17) coupled in parallel to one of the diodes (11-14) provide a charge-pump effect to improve performances of the first and second circuits (21, 22) and the light circuits (30).