Feedback control method, feedback control method based control method for asymmetric half bridge type flyback converter, and realization circuits for two methods
A flyback converter, feedback control technology, applied in control/regulation systems, output power conversion devices, DC power input conversion to DC power output and other directions, can solve the problem of poor load regulation, large number of components, line voltage problems such as poor regulation rate, to achieve the effect of high output voltage accuracy
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[0047] Figure 5 Shows a functional block diagram of a switching converter according to an embodiment of the present invention, an asymmetric half-bridge flyback primary side feedback control converter under non-complementary DCM conditions, including a flyback circuit and a primary side feedback circuit, the flyback circuit includes a primary side circuit And the secondary side output rectification filter circuit. The primary side circuit is formed by connecting the DC blocking capacitor C3, the main switch MOS tube QH, the clamp switch MOS tube QL and the primary winding Np1 of the transformer. The secondary side output rectification filter circuit is formed by the secondary The side winding Ns1 is connected with the capacitor C4 and the diode D1. The specific connection relationship is that the input voltage Vin+ is connected to the drain of the N-MOS transistor QH, and the source of the N-MOS transistor QH is connected to the primary winding N of the flyback transformer T1 v...
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