Method and circuit for accurately controlling switch power supply output current
A switching power supply and output current technology, applied in the direction of conversion equipment without intermediate conversion to AC, irreversible AC power input conversion to DC power output, etc., can solve the problems of limiting the use of switching power supply, loss of precision, etc., and achieve precise control , to avoid the loss of precision and reduce power consumption
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[0030] First, the principle of implementing the present invention is explained as follows. Take the flyback switching power supply as an example, see figure 2 . The flyback switching power supply (AC-DC converter) is composed of a power switch, a flyback transformer TM1 and a controller. Making full use of the information of the feedback voltage is the starting point of the present invention. According to the principle of magnetic flux balance, there are
[0031] Vin × Ton Npri = Vfr × Tr N sec · · · ( 4 )
[0032] Among them, Tr is the demagnetization time of the transformer secondary coil. In CCM, Tr is the time when the switching element is turned off; in DCM, Tr is the time from when the switch...
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