Segmented linear constant-current light emitting diode (LED) driving circuit
A technology of LED driving and linear constant current, which is applied in the direction of lamp circuit layout, electric light source, lighting device, etc., can solve the problem of waste of power consumption, and achieve the effect of improving circuit efficiency, reducing average operating current consumption, and reducing power consumption
Inactive Publication Date: 2015-12-23
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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[0003] In the current segmented linear constant current LED drive circuit, in each cycle, because the power tube is segmented, and the driving operational amplifier is always working in the cycle, it causes waste of power consumption.
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[0017]In this example, the number of operational amplifiers is 4, which are the first operational amplifier, the second operational amplifier, the third operational amplifier and the fourth operational amplifier; then the state detection module includes 4 output terminals, and the enable signal module includes 4 inputs terminal and 4 output terminals; the enabling signal module consists of the first two-input NAND gate AND1, the second two-input NAND gate AND3, the third two-input NAND gate AND6, the fourth two-input NAND gate AND7, The fifth and second input NAND gate AND8, the sixth and second input NAND gate AND9, the seventh and second input NAND gate AND10, the eighth and second input NAND gate AND11, the ninth and second input NAND gate AND12, the twelfth input and NOT gate AND13, first three-input NAND gate AND2, second three-input AND gate AND4, four-input NAND gate NAND5, three-input NOR gate NOR1, two-input NOR gate NOR2, first two-input OR gate OR3, The second two-i...
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The invention belongs to the technical field of an electronic circuit, in particular relates to a segmented linear constant-current light emitting diode (LED) driving circuit. In the main structure of the circuit, the output end of a reference voltage generation module is connected with positive input ends of operational amplifiers respectively; the output end of a rectification module is connected with an LED unit; the output end of the LED unit is connected with drains of N-channel metal oxide semiconductor (NMOS) power tubes; sources of the NMOS power tubes are all grounded through a detection resistor RS; the output end of each operational amplifier is connected with a grid of each NMOS power tube; reverse input ends of the operational amplifiers are all grounded through the detection resistor RS; the input end of a state detection module is connected with a connection points of the NMOS power tube and the detection resistor RS, and the output end of the state detection module is connected with the input end of an enable signal module; and the output end of the enable signal module is connected with enable signal ends of the operational amplifiers. The segmented linear constant-current LED driving circuit has the advantages that the operational amplifiers are closed by controlling the enable ends of the operational amplifiers corresponding to the power tubes, and the average working current consumption of a driving chip is substantially reduced.
Description
technical field [0001] The invention belongs to the technical field of electronic circuits, and in particular relates to a segmented linear constant current LED driving circuit. Background technique [0002] Light-emitting diode LED is a device that can work normally and emit light under a forward voltage of several volts. According to the optical characteristics of LED, as the forward current increases, the LED spectrum will change, and the LED luminous flux will increase accordingly. , that is, the brightness increases. In order to control the luminous brightness and spectrum of the LED, a stable current is usually required. The LED drive circuit can be divided into switch drive and linear constant current drive according to the working principle. The MOS tube in the switch drive circuit works in a high-frequency switch state and the whole circuit is relatively complicated. The adjustment tube of the drive circuit in the linear constant current drive circuit works in a c...
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IPC IPC(8): H05B37/02
Inventor 李泽宏汪榕
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA