A segmented linear constant current led drive 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: 2017-06-30
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
[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 electronic circuits, and in particular relates to a segmented linear constant current LED drive circuit. The main structure of the circuit of the present invention is that the output terminals of the reference voltage generation module are respectively connected to the positive input terminals of the operational amplifier; the output terminal of the rectification module is connected to the LED unit, and the output terminal of the LED unit is connected to the drain of the NMOS power tube; the NMOS The source of the tube power tube is grounded after passing through the detection resistor RS; the output terminal of each operational amplifier is connected to the grid of an NMOS power tube; the reverse input terminals of all operational amplifiers are grounded after passing through the detection resistor RS; the input of the state detection module The terminal is connected with a sampling resistor, and its output terminal is connected with the input terminal of the enabling signal module; the output terminal of the enabling signal module is connected with the enabling signal terminal of the operational amplifier. The beneficial effect of the present invention is that the average working current consumption of the driving chip is remarkably reduced by controlling the enabling terminal of the driving operational amplifier corresponding to the power tube to turn off the operational amplifier.
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
CPCY02B20/40
Inventor 李泽宏汪榕
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA