Control method for combined converter

A control method and converter technology, applied in the control/regulation system, the irreversible DC power input is converted into AC power output, the AC power input is converted into DC power output and other directions, which can solve electromagnetic interference, high voltage stress of switching devices , energy conversion efficiency reduction and other issues, to achieve the effect of reducing overall loss, reducing switching stress, and reducing conduction loss

Active Publication Date: 2015-07-29
张乙乙 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At this time, the conversion process of electric energy is actually changed from the original DC-DC to DC-AC-AC-DC, and the energy conversion efficiency of the whole system is reduced.
[0009] The second is to use coupled inductors, but the structure of coupled inductors is complex, which is not conducive to industrial processing, it is difficult to ensure the consistency of the circuit, and it will cause excessive voltage stress of switching devices, which wil

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  • Control method for combined converter
  • Control method for combined converter
  • Control method for combined converter

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Embodiment Construction

[0033] combined with figure 2 The structure of the present invention is described in detail. The specific connection relationship of the converter is as follows: the positive pole of the input voltage Vin is connected to one end of the inductance L and the negative end of the input capacitor C1, and the other end of the inductance L is connected to the collector of the switching element S1 and the diode D1. Anode, the emitter of the switching element S1 is connected to the collector of the switching element S2, the emitter of the switching element S2 is connected to the negative pole of the input voltage Vin, one end of the intermediate capacitor C2 is connected to the cathode of the diode D1, and the other end is connected to the emitter of the switching element S1 , the anode of diode D2 is connected to the cathode of diode D1, the cathode of diode D2 is connected to the positive terminal of input capacitor C1, one end of output capacitor Co is connected to the cathode of di...

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Abstract

The invention discloses a control method for a combined converter. The combined converter comprises a booster circuit and an inverter. The on and the off of a switch element are controlled, so that voltage drop between a collector electrode and an emitter electrode of the switch element is greatly reduced in comparison with that in the prior art while the boosting function is realized, the switch apparatuses are reduced in comparison with those in the prior art, and the conduction loss and the on-off loss of an integral switch tube are reduced; moreover, the inverter utilizes capacitance of a passive element as an energy exchange element for reasonably dividing a circuit working area, so that the energy loss can be reduced, the service life can be prolonged, the integral loss of the converter is further reduced, the structure is simple, no energy loss element is needed in the circuit, and the working efficiency of the converter is improved.

Description

technical field [0001] The invention relates to a control method for a DC-AC converter, in particular to a control method for a combined converter with low voltage switch stress and low loss. Background technique [0002] In a solar power generation system or a fuel cell system, since a single solar cell or a single fuel cell provides direct current with a low voltage, it cannot meet the electricity demand of existing electrical equipment, nor can it meet the requirements of grid connection. It is necessary to convert the low-voltage direct current into the actually required high-voltage direct current. Therefore, the boost converter with high gain and stable performance has become a research hotspot, which is of great significance to promote the development of photovoltaic and fuel cell industries. [0003] In addition, in the field of grid connection, the traditional voltage source inverter inputs DC voltage and outputs AC voltage, which is widely used. The input DC volt...

Claims

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Application Information

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IPC IPC(8): H02M7/537H02M3/155
CPCH02M3/155H02M7/48H02M1/0058Y02B70/10
Inventor 杨慧萌
Owner 张乙乙
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