LED (light emitting diode) constant-current driving circuit
A technology of constant current drive and circuit, which is applied in the direction of lamp circuit layout, electric light source, lighting device, etc. It can solve the problems that the cost cannot be further reduced, the volume of LED constant current drive circuit cannot be further reduced, and the electromagnetic radiation test cannot be passed. Achieve the effect of low cost, small size and simple circuit
Inactive Publication Date: 2015-06-10
ZHEJIANG FUTURE LIGHTING CO LTD
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- Description
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Problems solved by technology
[0003] The existing SD670XS control chip has good cost performance, but the currently disclosed LED constant current drive circuit designed around SD670XS still has shortcomings. For example, on the basis of ensuring that the electromagnetic radiation test passes, the circuit cannot be as simple as possible, otherwise, The electromagnetic radiation may exceed the standard by 10db and cannot pass the electromagnetic radiation test. If the circuit cannot be as simple as possible, then the overall volume of the LED constant current drive circuit cannot be further reduced, and the cost cannot be further reduced. Therefore, further research is needed in this regard
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[0011] The present invention is described in further detail below:
[0012] LED constant current drive circuit of the present invention, it comprises the control chip that model is SD670XS, it also comprises bridge rectifier BR1, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, resistance R1, resistance R2, resistance R3, resistance R4, resistance R6, magnetic core inductance L1, air core inductance L2, diode D1; the L end of the AC power is connected to the first AC access end of the bridge rectifier BR1, the N end of the AC power is connected to the second AC access end of the bridge rectifier BR1, and the capacitor One end of C1 and one end of air core inductor L2 are connected to the positive pole of bridge rectifier BR1, one end of capacitor C2, the negative end of diode D1, one end of capacitor C3, one end of resistor R1, one end of resistor R2, and the positive output terminal V+ Both are connected to the other end of the air-core ...
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The invention provides an LED (light emitting diode) constant-current driving circuit. On the basis that the LED constant-current driving circuit can pass an electromagnetic radiation test, the circuit is simple, the size is small, and the cost is low. The LED constant-current driving circuit comprises a control chip, a bridge type rectifier BR1, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R6, a magnetic core inductor L1, an air core inductor L2 and an diode D1, wherein one end of the capacitor C1 and one end of the air core inductor L2 are connected with an anode of the bridge type rectifier BR1; the capacitor C2, the capacitor C3, the resistor R1, the resistor R2, a negative end of the diode D1 and an outputting anode end V+ are connected with the other end of the air core inductor L2; the positive end of the diode D1, a fifth pin of a control chip and a sixth pin of the control chip are connected with one end of the magnetic core inductor L1; and the other end of the capacitor C3, the other end of the resistor R1 and an outputting cathode end V- are connected with the other end of the magnetic core inductor L1.
Description
technical field [0001] The invention relates to the technical field of LED driving circuits, in particular to an LED constant current driving circuit. Background technique [0002] The LED constant current drive circuit plays a key role in the LED lighting industry. With the evolution of technology, the current LED constant current drive circuit generally adopts the design scheme of the chip as the control unit. This kind of scheme has the characteristics of simple circuit and excellent performance. However, it is not enough to have a good chip. The peripheral circuit design around the chip required to form a complete circuit is very important. [0003] The existing SD670XS control chip has good cost performance, but the currently disclosed LED constant current drive circuit designed around SD670XS still has shortcomings. For example, on the basis of ensuring that the electromagnetic radiation test passes, the circuit cannot be as simple as possible, otherwise, The electrom...
Claims
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Inventor 陈江涛
Owner ZHEJIANG FUTURE LIGHTING CO LTD