DC output electricity of the fuel cell is often not directly applicable, and the transformation is required. The simplest is DC regulation. DC-AC transformation is required in the joint heating power generation system. The motor is an important component of a fuel cell system for driving compressors, fans and pumps.
1, DC regulator
The operating voltage range of the fuel cell may not be suitable for practical applications, and in the load circuit, the voltage is affected by the current, not a constant value. DC regulator is used
To adjust the output voltage of the fuel cell system and constantly.
The fuel cell is a low voltage power supply, which is usually necessary to perform boost transform. The boost conversion circuit is also known as the switching circuit or chopper circuit. In the electron switch on state TO, within time, the fuel cell is inductively charged, and the capacitor discharge generating current is transmitted. In the electronic switch cut, the diode is turned on. The inductive electromotive force generated by the inductor is in series with the fuel cell. After the two voltage is superimposed, the load is powered to the load while charging the capacitor. Then enter the next cycle.
Adjust the cut-off time of the electronic switch to obtain the required output voltage. Considering the energy loss of the circuit, the actual output voltage is slightly lower than the calculated value. Energy loss includes switching loss, inductance loss, and diode loss. The conversion efficiency is generally not less than 80% A. When the operating voltage of the fuel cell is greater than 100 V, the conversion efficiency can reach more than 95%.
The action of the inverter is to convert the DC electrically converted to alternating current. The fuel cell produces direct current, as a low voltage power supply. This is the advantage of the fuel cell. When supplied to the power supply, or when power is powered online with the grid, the DC electrical conversion of the fuel cell is required to alternate.
The inverter is divided into different types in different functions. Press the luminous power form to voltage type and current type, divided into single-phase type and three-phase type according to the output voltage phase, and divided into rectangular wave type and sinusoidal type according to the output waveform.
3, electric motor
The motor in the fuel cell system is used to drive the compressor, the fan, and the pump to achieve the reaction gas supply, cooling cycle, and the like. The power supply of the power is at least 3 electric motors than the fuel cell power supply above IKW. Require motor efficiency and long life.
A power supply system consisting of a fuel cell and a battery is called a hybridsystem. The fuel cell / battery hybrid system is suitable for the case where the power consumption of the load consumption changes, and the power consumption of the communication device is much larger than the motor vehicle.
The fuel cell / battery hybrid system is a choice of performance and cost. It is necessary to provide peak power consumption with a battery. The greater the power of the fuel cell, the higher the cost of the battery stack, the higher the cost of attachments such as compressors, condenser, etc.
In a fuel cell / battery hybrid system, the rated power of the fuel cell is close to the average power of the machine device, and most of the time is operated at rated power. When the power consumption of the machine device is lower than the rated power of the fuel cell, the fuel cell is charged for the battery. When the power consumption of the machine device is higher than the rated power of the fuel cell, the power exceeding the portion is provided by the battery.
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Shenzhen Geerady New Energy Co., Ltd NO.7888, SHENZHEN, CHINA