Segmented linear constant-current light emitting diode (LED) driving circuit
A technology of LED driving and linear constant current, applied in the direction of electric lamp circuit arrangement, 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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[0019]In this example, the number of operational amplifiers is 4, which are respectively the first operational amplifier, the second operational amplifier, the third operational amplifier and the fourth operational amplifier; then the state detection module includes 4 input terminals and 4 output terminals, and the enable signal The module includes 4 input terminals and 4 output terminals; the resistance module includes 4 sampling resistance units, which are divided into a first resistance sampling unit composed of a first resistance R1 and a second resistance R2 connected in series, a third resistance R3 and a second resistance sampling unit. The second resistance sampling unit composed of four resistors R4 in series, the third resistance sampling unit composed of the fifth resistance R5 and the sixth resistance R6 in series, the fourth resistance sampling unit composed of the seventh resistance R7 and the eighth resistance R8 in series, state detection The first input termina...
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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 sampling resistor, 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 drive 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 con...
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IPC IPC(8): H05B37/02
CPCY02B20/40
Inventor 李泽宏汪榕
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA