Energy-controllable output device for fuel cell and control method

Abstract

The invention relates to an energy-controllable output device for a fuel cell and a control method. Through modularized structural design, the energy-controllable output device can control energy output of the fuel cell. The energy-controllable output device comprises a voltage-boosting regulating module, a voltage-reducing regulating module, a CAN (Controller Area Network) bus-based main control module and a fault diagnosing and alarming module. Through 2-stage conversion technology, the input voltage withstanding range is wide, the output voltage, the output current and the output power are controllable, and the power output energy of a load can be automatically tracked; the energy-controllable output device is provided with an IGBT (insulated gate bipolar translator) driving circuit with electrification protection, and the fault diagnosing and alarming module, so that the working safety of the energy-controllable output device is improved; through a soft start control and a 4-combination PID (proportion integration differentiation) control algorithm, the working accuracy and the working stability of the energy-controllable output device are improved; and the energy-controllable output device is high in conversion efficiency, can be applied to not only a fuel cell, but also other energy devices with very wide voltage output ranges, and is applicable to various electrical and electronic fields.

Description

technical field [0001] The invention belongs to a fuel cell energy output device, in particular to a fuel cell energy controllable output device and control method applied to high efficiency, energy saving, clean and environment-friendly, strong safety and high reliability. Background technique [0002] With the continuous reduction of non-renewable energy sources, promoting the rapid development of new energy sources has become a top priority. As a new energy source, fuel cells are clean, environmentally friendly, energy-saving and efficient, and provide a very good solution to the problem of energy shortage. The fuel cell has high conversion efficiency, almost zero pollution to the environment, small size, and can be used conveniently at any time and place. [0003] However, the output characteristics of the fuel cell are very soft. The larger the output current, the lower the output voltage. This causes the output voltage of the fuel cell to be too wide, far exceeding th...

AI Technical Summary

Problems solved by technology

At present, the input range of the existing switching power supply device is very narrow, only allowing the input ripple to fluctuate within a certain range, while the output characteristics of the fuel cell are soft, and the output range has a very large conversion range with the power change, and some even exceed 3 times. Transformation, some input-output relations dynamically change, and there are situations of step-up and step-down

[0006] 2) The output voltage is fixed

Currently, the existing switching power supply device control schemes have limited output methods, and can only output fixed voltages according to series levels. Users cannot change them at will, let alone energy control, and output dynamic control cannot be performed according to user needs.

[0007] 3) Low conversion efficiency

High-power power supply is a strong electric product, with large current and high heat generation of power devices. If the circuit design is not good, it is easy to cause severe heat generation of the device. Improper control strategy will also seriously affect the power conversion efficiency and waste energy.

[0008] 4) Low control precision

At present, under the influence of input disturbance and load change, the high-power power supply device has poor dynamic response ability, cannot accurately and quickly control the output of the power supply device, the duty cycle of the microcontroller output is unstable, and the control accuracy is poor.

[0009] 5) Poor safety and stability

High-power power supplies have high current and high voltage, so the requirements for power devices are very high. If the safety protection circuit and software control design are not adopted, the large current generated during use will easily burn out the components of the power module.

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