Efficient and high-power vehicle-mounted DCDC power supply

Abstract

The invention discloses an efficient and high-power vehicle-mounted DCDC power supply. The output positive electrode of a vehicle-mounted fuel cell is connected with a first contactor and a first electric reactor in sequence through a fuse; the output negative electrode of the fuel cell is connected with a second contactor; the output ends of the first electric reactor and the second contactor areconnected with a first capacitor in parallel; the first capacitor is connected with a filter through a DC/DC conversion circuit; the output positive electrode end of the filter is connected to a loadpower battery through a reversion preventing diode; and the DC/DC conversion circuit adopts a dual Boost topological structure which is formed by a primary boost circuit and a secondary boost circuitin a reversely staggered and parallel connection manner. The instable low voltage output by the fuel cell is converted into a stable high voltage to be stored in the power battery to be used by equipment and the driving motor on the vehicle; and the power supply is high in power output efficiency, small in size and light in weight, less in raw material loss and low in cost.

Description

technical field [0001] The invention relates to a high-efficiency and high-power vehicle-mounted DCDC power supply. Background technique [0002] As the problem of environmental pollution becomes more and more prominent, traditional petroleum energy can no longer meet the power demand of the current automobile industry. Fuel cells with superior performance are widely considered to be the best choice for future electric vehicle energy solutions; fuel cells are a kind of energy that will exist in The chemical energy in the fuel and oxidant is directly converted into a power generation device for electric energy. The fuel of the hydrogen fuel cell is hydrogen and oxygen, and the reaction product is only water. Therefore, the hydrogen fuel cell vehicle has achieved zero emission and zero pollution in the true sense. [0003] Due to the low output voltage of hydrogen fuel cells, large fluctuations, and relatively soft output characteristics; if the fuel cell is used as a direct d...

AI Technical Summary

Problems solved by technology

[0004] The topology schemes of DC-DC converters in the prior art are mainly divided into isolated DC / DC topology and non-isolated DC / DC topology. The isolated DC / DC topology mainly includes forward, flyback, boost Pull, bridge, LLC series resonance and its derivative topologies, etc. Non-isolated DC / DC topology circuits mainly include Buck / Boost, Cuk, Sepic and their derivative topologies, etc.; the isolated converter topology has a large number of components and takes up space Large, cumbersome installation and operation, and the fuel cell vehicle-mounted DC-DC converter has a large power requirement, and the power is generally greater than 30kW. Forward, flyback, and push-pull topological circuits can only be suitable for power supplies below 1kW, and cannot be adapted to fuel cell vehicles. Power requirements; the output voltage of the fuel cell also fluctuates greatly, ranging from tens of volts to three to four hundred volts. The efficiency of the bridge topology is too low at low voltage and high power, and it cannot meet the needs of the fuel cell vehicle power supply ;Although the number of components of the non-isolated converter is relatively small and the space occupied is small, for example, the circuit of the Boost converter is simple, the input current is continuous, and the efficiency is high, but its diode reverse recovery loss is relatively large, resulting in a decrease in system efficiency

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