Alternating current/direct current (AC/DC) converter adopting active energy-storage capacitance converter
A capacitor converter, energy storage capacitor technology, applied in the direction of converting irreversible AC power input to DC power output, electrical components, output power conversion devices, etc. It can improve the power density of the power supply, reduce the capacitance value, and prolong the life of the converter.
Active Publication Date: 2013-10-09
NANJING UNIV OF SCI & TECH
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Problems solved by technology
However, electrolytic capacitors are large in size, and their lifespan is usually only a few thousand hours, which affects the further improvement of the power density of the power supply and restricts the life of the power supply.
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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. Traditional PFC converter
[0016] combine figure 1 The block diagram of the two-stage AC / DC converter does not pay attention to the internal topology and control method, but regards it as a "black box", and studies the relationship between the ripple voltage of the energy storage capacitor and the capacitance value of the capacitor. For the convenience of analysis, two assumptions are made first:
[0017] 1) The output voltage ripple is very small compared to its DC capacity; 2) All devices are ideal components without loss.
[0018] Define the input voltage v of the PFC converter in (t) is:
[0019] v in (t)=V m sin ω L t(1)
[0020] where V m is the magnitude of the input AC voltage, ω L is the angular frequency of the input AC voltage, and t is time.
[0021] When the input power factor is 1, the input current...
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The invention provides an alternating current / direct current (AC / DC) converter adopting an active energy-storage capacitor converter. The AC / DC converter comprises an AC / DC converter main power circuit (1), an active energy-storage capacitor converter main power circuit (2) and a control circuit. The control circuit comprises an input voltage difference sampling circuit (3), a phase-shift circuit (4), a rectifying circuit (5), a peak value sampling circuit (6), a signal conditioning circuit (7), a square-root circuit (8), a multiplying unit (9) and a pulse-width modulation (PWM) and switch tube drive circuit (10). The active energy-storage capacitor converter main power circuit (2) and the control circuit are led into the AC / DC converter comprises an AC / DC converter main power circuit (1) and connected onto a direct current bus of the AC / DC converter main power circuit (1), so that under the condition that the input power factor is ensured to be 1, energy-storage capacitor values identical in voltage rating are greatly decreased, a thin-film capacitor or a ceramic capacitor and other small-capacity and long-service-life capacitors can be adopted, the defect that an electrolytic capacitor serving as an energy-storage capacitor is large in volume and short in service life is overcome, and the AC / DC converter has the advantages that the power supply power density is remarkably improved, the service life is prolonged and the like.
Description
technical field [0001] The invention relates to the field of AC-DC converters of electric energy conversion devices, in particular to an AC / DC converter using an active energy storage capacitor converter. Background technique [0002] With the development of power electronics technology, the requirements for power conversion devices are getting higher and higher. In AC / DC converters, power factor correction (powerfactorcorrection, PFC) technology can reduce current harmonics and improve input power factor (powerfactor, PF), has been widely used. [0003] In the AC / DC converter, since the instantaneous input power is pulsating and the output power is constant, an energy storage capacitor is needed to balance the difference between the instantaneous input power and output power. Electrolytic capacitors have the characteristics of high withstand voltage and large capacitance, and are widely used as energy storage capacitors for traditional AC / DC converters. However, the elect...
Claims
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Login to View More IPC IPC(8): H02M7/12H02M1/14
Inventor 姚凯阮新波
Owner NANJING UNIV OF SCI & TECH