A segmented linear constant current led drive 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 problems of waste of power consumption, and achieve the effect of improving circuit efficiency, reducing power consumption, and reducing average operating current 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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[0021] 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; The 8 input terminals of are connected in turn; such as Figure 4 As shown, the clock signal generation module consists of a first buffer, a second buffer, a third buffer, a fourth buffer, a fifth buffer, a sixth buffer, a seventh buffer, an eighth buffer, The first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the first capacitor C1, the second capacitor C2, The third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, the sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8, the first NOT1, the second NOT2, the third NOT3, the fourth NOT gate NOT4, fifth NOT gate NOT5, sixth NOT gate NOT6, sev...
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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 circuit of the present invention is mainly 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 tube The source of the 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 terminal of the state detection module The sampling resistor is connected, and its output terminal is connected to the input terminal of the clock signal generating module; the output terminal of the clock signal generating module is connected to the enabling signal module, and the enabling signal module controls 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 end 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