The Research And Design Of Double Barrel Forward Driving For Soft-Switching Power Based On IGBT

Along with all controls the component (is mainly at present power MOSFET and IGBT) the widespread use as well as the pulse-duration modulation technology maturity, the high frequency soft switching power supply also obtained has developed extremely quickly. The transformation electrical energy's power source is take satisfies the people to use power source's request as the starting point, to generates the electricity according to the different operation requirements and the characteristic the power source to carry on a transformation again. This kind of transformation is one kind of shape electrical energy transformation for another kind of shape electrical energy, it may be between the alternating current and the direct current transformation, may also be the voltage or the electric current peak-to-peak value transformation, or is transformations and so on alternating current frequency, phase. On the other hand, this kind of electrical energy shape's transformation may be power source's stability enhances or to other performance improvement, some people call this kind of power source it"the fine electricity". The soft switching power supply input and the output are electrical energies, it belongs to the transformation electrical energy power source. In future electronic industrial field, the soft switch technology was still the focal point which the researchers pay attention, builds the solid foundation for the switching power supply technology's recent development to set up the new range pole.The present paper discussed one kind new double barrel to stir up the soft switch DC/DC converter electric circuit analysis situs. The main power component uses the IGBT part, by the power diode, the inductance, the electric capacity is composed the resonant network to improve IGBT the switch condition, will overcome the traditional switch to clear and in the closed process the power production will lose, and reduced the switch sensitive malpractice.One of soft switch's characteristics is the switch separates when is the resonant profile, its simple electric circuit is the switch component and the electric capacity is parallel, such switch component both sides voltage rises slowly, the switch component's electric current falls zero, at the same time the voltage electric current is not zero time shortening rapidly, therefore lost reduces. The electric current falls to the zero hour voltage is smaller, its loss is also smaller, if uses the electric capacity C capacity is big, the switch separates when voltage approximate 0V, switching valve breakover loses increases. By now, the switch component's electric current was zero, although in the electric capacity has the resonance current, but does not have the loss. However, condenser charge voltage when breakover has the loss through the switch component electric discharge.The soft switch technology is also one kind double barrel is stirring up the soft switch based on IGBT, therefore the following second chapter in detail briefed the IGBT static state, the dynamic characteristic, main parameter and driving circuit, soft switching power supply foundation electric circuit and accurate acceptor's principle of work.Then namely introduced for this paper's hard core, because IGBT the characteristic had decided it the request has the low power and the loss of voltage in the actuation process, and can withstand certain short circuit bearing capacity and have the big safe area. How can therefore in the high efficiency, the low voltage driving circuit be in the entire electron, the electrical power system is urgently needed solves a question key. This part elaborated the IGBT driving circuit with emphasis, and realized this article through driving circuit's main parameter computation to study based on the IGBT soft switching power supply electric circuit schematic diagram design, summarized electric circuit's performance characteristic, in present market application and superiority. is final, in view of the above driving circuit and the parameter computation, this switching power supply which studied to me has carried on the circuit simulation, through to electric circuit's simulation, the question which discovered mainly has the following several aspects:The resonant inductance and the resonant electric capacity's computation is to the circuit simulation foundation, only then after agreeing to inspire the inductance and the resonant electric capacity compose the cushion circuit which determines, can determine electric circuit other parameters.The initiation inductance parameter's determination is the electric circuit profile is correct or not a very important link, so long as the change initiation inductance's value, converter's output wave shape will change naturally, after the research, its reason will be: The initiation inductance has the direct influence to the transformer two side's dutyfactors, is serious when will create two time side dutyfactor D the loss. Meanwhile, the transformer primary side simultaneously also comes under the influence, if its inductance quantity elects oversized, then Cr and the Lm resonant time is excessively long, does not favor transformer's magnetic flux replacement, is big to the transformer primary side electric current and the vice-side electric current influence. If Lm elects too small, then clears the time the surge current is oversized, but affects system's stability. Are influential to the converter both sides' voltage and the electric current.Output circuit's filter inductance Lf, filter electric capacity Cf is also in the simulation two experimental values, to simultaneously consider the actual production cost, filter inductance Lf and filter electric capacity Cf value, although in the theory is enough big, but is satisfying in the scope which the electric circuit performance needs to reduce filter inductance Lf and the filterelectric capacity Cf value with every effort. Has determined in the electric circuit each parameter value, finally through to electric circuit's performance index's confirmation, draws the final conclusion, this design meets the actual requirement basically.Entire chapter paper multianalysis electric circuit principle of work, in does not use in the auxiliary switching valve's situation, has realized the main power switching valve's zero potential zero electric current clear and the shutdown. Has established electric circuit's simulation model based on the principle of design, has built the simulation model using the MATLAB/SIMNLINK software, optimized the main circuit parameter, has recorded the electric circuit key parameter oscillogram, has confirmed this electric circuit principle of work analysis accuracy through the circuit simulation.The present paper has designed an output voltage is 48V, the output is 1.5kW, the operating frequency is 80kHz, the resonance frequency is the 350kHz switching power supply theoretical model, the efficiency reaches 90.6% under the fixed active status. This circuit structure is simple, the cost is low, the operating frequency is high, the efficiency is high, with ordinary double barrel is stirring up the converter to compare has the high use value.