A self-excited oscillation drive circuit
A driving circuit, self-excited oscillation technology, applied in the layout of electric lamp circuit, electric light source, lighting device, etc., can solve the problems of changes, the influence of heat dissipation design of lamps and lanterns on the life of LED lamp beads, and the absence of high-precision voltage reference signals, etc., to achieve constant current High precision, small variation effect
Active Publication Date: 2016-08-24
OPPLE LIGHTING
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Problems solved by technology
However, although the cost of the self-excited oscillation circuit in the prior art is low, since there is no closed-loop feedback of the output current in the self-excited oscillation circuit, and there is no high-precision voltage reference signal similar to the inside of the integrated control chip in the self-excited oscillation circuit, The open-loop control makes the output current change greatly when the input voltage changes and the output load changes
From the actual test results, a figure 2 The product of the step-down circuit self-excited oscillation driving circuit shown in , when the input voltage changes by plus or minus 20%, the output current changes by plus or minus 17% and minus 26%; while the output voltage changes by plus or minus 13% Under normal circumstances, the output current changes by plus or minus 8%. Such a large output current range change will cause a large change in the light output of the LED lamp, which will affect the actual use effect of the lamp, and also affect the heat dissipation design of the lamp and the life of the LED lamp bead. will also have some impact
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[0018] Please refer to figure 2 As shown, the self-excited oscillation drive circuit 1 of the present invention includes a filter device 10 connected to an input voltage V1 , a drive device 20 , a switch device Q1 and a transformer 30 . The output current of the self-oscillating driving circuit 1 is used to drive the load LED to light the LED. The transformer 30 includes at least one self-excited driving winding L2. The driving device 20 is used to control the turn-on and turn-off of the switching device Q1, so as to realize the self-excited oscillation operation of the circuit through the self-excited drive winding L2, the cut-off, amplification and turn-on of the switching device Q1. A sampling device Rs is connected between the switching element Q1 and the self-excited driving winding L2 to provide a sampling signal to control the switching off and on of the switching element Q1.
[0019] The driving device 10 , the self-excited driving winding L2 , the switching device ...
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The invention discloses a self-excited oscillation driving circuit, which includes a filtering device, a driving device, a switching device, a sampling device connected with the switching device, and a transformer, the transformer at least includes a self-excited driving winding, and the driving device Controlling the on and off of the switching device, the driving device, the self-excited driving winding, the switching device and the sampling device form a loop, and it is characterized in that: the self-excited oscillation driving circuit also includes a circuit connected to the driving device , a current control device between the loop formed by the self-excited driving winding, the switching device and the sampling device to further control the switching device.
Description
【Technical field】 [0001] The invention relates to a driving circuit, in particular to a driving circuit of a light emitting diode. 【Background technique】 [0002] With the wide application of light-emitting diode (LED) technology and products, the demand for matching LED drive power is also increasing. In order to reduce the design and production costs of LED drive power, thereby reducing the price of LED lamps, self-excited oscillation circuits are also used. Gaining importance. Such as figure 1 As shown, a non-isolated step-down circuit type self-excited oscillation drive circuit 200 includes a drive power supply 201, a fuse F2, a rectifier bridge 202, a filtering device 203, a starting device 204, a driving device 205, a transformer 206, a switching device 207, and a sampling device 208 . The self-excited oscillation drive circuit 200 of the non-isolated step-down circuit type is used for driving an LED load. The transformer 206 has a self-excited drive winding 209 . ...
Claims
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IPC IPC(8): H05B37/02
Inventor 文威白俊谊
Owner OPPLE LIGHTING