LED LIGHTING SYSTEM
First Claim
1. LED lighting system comprising a power supply circuit and one or more LED modules, wherein the power supply circuit comprises:
- input terminals for connection to a power supply source and first and second output terminalsa driver circuit coupled between the input terminals and the first and second output terminals for generating a LED current, the driver circuit comprising a driver control circuit equipped with an input terminal for increasing or decreasing the LED current in dependency of a signal present at the input terminal of the driver control circuit,and wherein the one or more LED modules comprise;
first and second input terminals for connection to respectively the first and second output terminals of the power supply circuit,a series arrangement of a LED load and a current sensor coupled between the input terminals,a module control circuit for generating a current control signal at an output terminal of the module control circuit and coupled to the current sensor and to a reference signal generator for generating a reference signal representing a desired magnitude of the LED current, wherein the current control signal has a first value in case the desired magnitude of the LED current is lower than the measured value of the LED current and a second value in case the desired value of the LED current is higher than the measured value of the LED current, anda coupling circuit during operation coupled between the output terminal of the module control circuit and the input terminal of the driver control circuit, for communicating the first value of the current control signal to the input terminal of the driver control circuit and for blocking the second value, andwherein the signal at the input terminal of the driver control circuit has a default value when all the current control signals have their second value.
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Accused Products
Abstract
The invention relates to LED lighting system comprising a power supply circuit and one or more LED modules. The power supply circuit is equipped with input terminals (K1, K2) for connection to a supply voltage source and first and second output terminals (K3, K4), and a driver circuit (I, II) coupled between the input terminals and the first and second output terminals for generating a LED current. The driver circuit (I, II) comprises a driver control circuit (II) equipped with an input terminal (K7) for increasing or decreasing the LED current in dependency of a signal present at the input terminal of the driver control circuit. The one or more LED modules comprise first and second input terminals (K5, K6) for connection to respectively the first and second output terminals of the power supply circuit, a series arrangement of a LED load (LS) and a current sensor (R1) coupled between the input terminals, a module control circuit for generating a current control signal at an output terminal of the module control circuit and coupled to the current sensor and to a reference signal generator (R3, R4, R5, Z1) for generating a reference signal representing a desired magnitude of the LED current, wherein the current control signal has a first value in case the desired value of the LED current is lower than the measured value of the LED current and a second value in case the desired value of the LED current is higher than the measured value of the LED current, and coupling circuitry (D1; Sg, DC, C1, C2) coupled during operation between the output terminal of the module control circuit and the input terminal of the driver control circuit, for communicating the first value of the current control signal to the input terminal of the driver control circuit and for blocking the second value, and wherein the signal at the input terminal of the driver control circuit has a default value when all the current control signals have their second value.
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Citations
12 Claims
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1. LED lighting system comprising a power supply circuit and one or more LED modules, wherein the power supply circuit comprises:
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input terminals for connection to a power supply source and first and second output terminals a driver circuit coupled between the input terminals and the first and second output terminals for generating a LED current, the driver circuit comprising a driver control circuit equipped with an input terminal for increasing or decreasing the LED current in dependency of a signal present at the input terminal of the driver control circuit, and wherein the one or more LED modules comprise; first and second input terminals for connection to respectively the first and second output terminals of the power supply circuit, a series arrangement of a LED load and a current sensor coupled between the input terminals, a module control circuit for generating a current control signal at an output terminal of the module control circuit and coupled to the current sensor and to a reference signal generator for generating a reference signal representing a desired magnitude of the LED current, wherein the current control signal has a first value in case the desired magnitude of the LED current is lower than the measured value of the LED current and a second value in case the desired value of the LED current is higher than the measured value of the LED current, and a coupling circuit during operation coupled between the output terminal of the module control circuit and the input terminal of the driver control circuit, for communicating the first value of the current control signal to the input terminal of the driver control circuit and for blocking the second value, and wherein the signal at the input terminal of the driver control circuit has a default value when all the current control signals have their second value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. Method for operating at least one LED module comprising a LED load by means of a driver circuit comprised in a power supply circuit, the method comprising the following steps:
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providing a module control circuit in each LED module for generating a current control signal in dependency of a measured magnitude of the LED current and a desired magnitude of the LED current, the current control signal having a first value in case the desired value of the LED current is lower than the measured value of the LED current and a second value in case the desired value of the LED current is higher than the measured value of the LED current, providing a driver control circuit in the power supply circuit, the driver control circuit being equipped with an input terminal, for increasing or decreasing the LED current in dependency of the signal present at the input terminal of the driver control circuit, adjusting the signal at the input terminal of the driver control circuit in dependency of the current control signal.
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Specification