Driver device and driving method
First Claim
1. Driver device for driving a load, in particular for driving an LED unit comprising one or more LEDs, comprising:
- input terminals for connecting the driver device to an electrical power supply for receiving an input voltage as a variable voltage from the electrical power supply,a converter unit for converting the input voltage to an output voltage including a resonant converter having a resonant frequency and a switch unit, wherein the switch unit is adapted to provide a chopped voltage of the input voltage as a drive voltage to the resonant converter, anda control unit connected to the switch unit for controlling a pulse frequency (fP) of the chopped voltage, wherein the control unit is adapted to control an input current drawn from the electrical power supply by controlling the pulse frequency of the chopped voltage as a function of the resonant frequency on the basis of a measured value of the variable input voltage, and wherein the control unit is further adapted to determine an input current reference value, and to compare the input current reference value to a measured value of the input current, wherein the input current drawn increases as the pulse frequency approaches the resonant frequency.
3 Assignments
0 Petitions
Accused Products
Abstract
A driver device (10) for driving a load (22), in particular for driving an LED unit comprising one or more LEDs is presented. The driver device comprises input terminals (12, 14) for connecting the driver device to an electrical power supply (16) for receiving a variable input voltage (V10) from the electrical power supply, a converter unit (25) for converting the input voltage (V10) to an output voltage (V12) including a resonant converter (40) and a switch unit (26), wherein the switch unit is adapted to provide a chopped voltage of the input voltage as a drive voltage (V16) to the resonant converter, and a control unit (34) connected to the switch unit for controlling a pulse frequency (fP) of the chopped voltage, wherein the control unit is adapted to control an input current (I10) drawn from the electrical power supply by controlling the pulse frequency of the chopped voltage on the basis of a measured value of the variable input voltage.
17 Citations
20 Claims
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1. Driver device for driving a load, in particular for driving an LED unit comprising one or more LEDs, comprising:
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input terminals for connecting the driver device to an electrical power supply for receiving an input voltage as a variable voltage from the electrical power supply, a converter unit for converting the input voltage to an output voltage including a resonant converter having a resonant frequency and a switch unit, wherein the switch unit is adapted to provide a chopped voltage of the input voltage as a drive voltage to the resonant converter, and a control unit connected to the switch unit for controlling a pulse frequency (fP) of the chopped voltage, wherein the control unit is adapted to control an input current drawn from the electrical power supply by controlling the pulse frequency of the chopped voltage as a function of the resonant frequency on the basis of a measured value of the variable input voltage, and wherein the control unit is further adapted to determine an input current reference value, and to compare the input current reference value to a measured value of the input current, wherein the input current drawn increases as the pulse frequency approaches the resonant frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15)
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14. Driving method for driving a load, in particular for driving an LED unit, comprising the steps of:
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converting a variable input voltage to an output voltage by means of a converter unit including a resonant converter having a resonant frequency for powering the load, wherein a chopped voltage of the input voltage is provided as a drive voltage to the resonant converter by means of a switch unit, and controlling an input current drawn from an electrical power supply on the basis of a measured value of the variable input voltage received from the electrical power supply by controlling a pulse frequency (fP) of the chopped voltage as a function of the resonant frequency, wherein the input current drawn increases as the pulse frequency approaches the resonant frequency, determining an input current reference value; and comparing the input current reference value to a measured value of the input current.
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16. Driver device for driving a load, in particular for driving an LED unit comprising one or more LEDs, comprising:
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input terminals for connecting the driver device to an electrical power supply for receiving an input voltage as a variable voltage from the electrical power supply, a converter unit for converting the input voltage to an output voltage including a resonant converter and a switch unit, wherein the switch unit is adapted to provide a chopped voltage of the input voltage as a drive voltage to the resonant converter, wherein the switch unit comprises two controllable switches for converting the input voltage to the chopped voltage, wherein a node between the controllable switches is directly connected to the resonant converter to provide the chopped voltage directly to the resonant converter, and a control unit connected to the switch unit for controlling a pulse frequency (fP) of the chopped voltage, wherein the control unit is adapted to control an input current drawn from the electrical power supply by controlling the pulse frequency of the chopped voltage on the basis of a measured value of the variable input voltage, and wherein the control unit is further adapted to determine an input current reference value, and to compare the input current reference value to a measured value of the input current. - View Dependent Claims (17, 18, 19, 20)
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Specification