Vehicle intelligent charger simple design is introduced
With energy, environmental protection problem increasingly prominent, the electric car has become in recent years the rapid development of a new type of car.At present, the main problems of the development of electric vehicles is the onboard energy problems, thus to develop a convenient, fast and efficient charger is indispensable.The following simple introduce an intelligent car quick charger design.
Circuit topology design, main transformation in the topology of switch power supply all kinds of transform, half bridge transformation is famous for its big output power, simple structure, less switching devices, to achieve lower cost of similar power transformation and ability to resist magnetic flux imbalance is strong wait for an advantage, be preferred in the structural design of the adapter.Half bridge circuit consists of two equal, large capacity and high voltage capacitor form a partial pressure circuit, by controlling a bridge arm two switch tube conduction and globe alternately, in high voltage switch pulse transformer primary side, thus at the edge of the deputy induction alternating square-wave, realize power conversion.A prominent advantage of this circuit topology is the connection blocking capacitor has the ability to resist magnetic flux imbalance.Effectively prevent declination, at the same time, the leakage inductance of the transformer primary side of the peak voltage clamp is located in the dc bus voltage, the leakage inductance of the stored energy to return to the input bus, rather than by the resistance element.
The design of protection circuit, overvoltage, undervoltage, over current protection circuit, over temperature protection function, when the above problems, the control system on the degree of emergency fault judgment in the first place, as seen under voltage or over temperature signal in a glance, restricting output power protection solutions;In case of over current, short circuit fault, such as control of main circuit to stop working, and protect the charging power supply from damage, to make the system work, needs to be switched on.
