Boost power factor correction (PFC) converter adopting small-capacity long-service-life energy-storage capacitor
An energy storage capacitor and long-life technology, which is applied in the direction of high-efficiency power electronic conversion, output power conversion device, and conversion equipment without intermediate conversion to AC, can solve the requirements of large volume, restricting the development of power supply technology, and affecting the long life of power supply and other problems, to achieve the effect of reducing the capacitance value and the volume of the capacitor
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[0014] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0015] 1. The relationship between output voltage ripple and energy storage capacitor value
[0016] Think of the PFC converter as a "black box", such as figure 1 shown, where C B is the storage capacitor.
[0017] Let the input voltage v in (t) is:
[0018] v in (t)=V m sin ωt (1)
[0019] where V m is the input AC voltage amplitude, t is time, ω=2π / T line ,T line is the input AC voltage cycle.
[0020] If the input power factor is 1, then the input current can be expressed as:
[0021] i in (t)=I m sin ωt (2)
[0022] where I m is the magnitude of the input current.
[0023] From equations (1) and (2), the instantaneous input power p can be obtained in (t) is:
[0024] p in ( t ) = v in ...
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