A flyback LED constant current driver based on structure without auxiliary winding
A non-auxiliary winding, flyback technology, applied in instruments, output power conversion devices, DC power input conversion to DC power output, etc., can solve the problem of reducing the system's anti-interference ability, increasing the cost of integrated circuits, and increasing cost and volume and other issues, to achieve the effect of saving auxiliary winding and feedback voltage divider network, reducing manufacturing and packaging costs, reducing manufacturing costs and design costs
Inactive Publication Date: 2016-03-02
ZHEJIANG UNIV +1
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Problems solved by technology
Since the auxiliary winding and the voltage divider network cannot be integrated into the integrated circuit, the cost and volume of the system will be greatly increased for the entire system
At the same time, the integrated circuit obtains the sampling signal through an additional feedback pin, which greatly increases the cost of integrated circuit manufacturing and packaging, and also reduces the anti-interference ability of the system, which affects the reliability of the system
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[0020] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0021] Such as figure 2 As shown, a flyback LED constant current driver based on no auxiliary winding structure, including: rectifier bridge, input filter capacitor CR, power switch tube M, sampling resistor Rs, flyback transformer T, freewheeling diode D, output The filter capacitor CL also includes a constant current control unit 1 , and the constant current control unit further includes a degaussing time detection circuit 11 , a constant current logic control circuit 12 and a peak current detection circuit 13 . The input filter capacitor CR is connected between the positive and negative terminals of the rectifier bridge output, the drain of the power switch tube M is connected to the positive output of the rectifier bridge, the source is connected to ...
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The invention discloses a flyback type LED constant-current driver based on a structure without an auxiliary winding. The flyback type LED constant-current driver detects the demagnetization time of a primary winding of a transformer by sampling a switch MOS transistor grid signal and detects the current peak value of the primary winding of the transformer by sampling the voltage on a primary current sampling resistor, and then a constant-current control logic device determines the switching period of a switching circuit through timing, so that constant-current control is achieved. Compared with the prior art, the flyback type LED constant-current driver has the advantages that the auxiliary winding of the transformer and a divider resistor are omitted; in addition, a constant-current control circuit and a switching transistor can be integrated on one chip, as a result, the overall disturbance resistance is improved, the complication degree of a periphery circuit is reduced, the size of a system is reduced, and the cost of the whole driver is reduced.
Description
technical field [0001] The invention belongs to the technical field of LED drive control, and in particular relates to a flyback LED constant current driver based on a non-auxiliary winding structure. Background technique [0002] At present, most LED constant-current drivers adopt a flyback circuit structure, and use primary-side feedback control technology, that is, control the output current by detecting the primary-side signal of the transformer. figure 1 It is a circuit diagram of a traditional flyback LED driver. The alternating current is rectified and filtered by a diode rectifier bridge and then filtered by the first capacitor C1 to generate a direct current voltage. The transformer has three windings, which are primary winding, secondary winding and auxiliary winding. The primary winding is connected between the aforementioned DC power supply and the drain of the power switch tube M1, and the secondary winding is connected between the anode of the freewheeling dio...
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IPC IPC(8): H02M3/335H05B37/02
Inventor 冷亚辉奚剑雄何乐年朱勤为黄飞明
Owner ZHEJIANG UNIV