Integrated analog controlled DC/DC converter for hydrogen fuel cell system
阅读说明：本技术 用于氢燃料电池系统的集成化模拟受控dc/dc变换器 (Integrated analog controlled DC/DC converter for hydrogen fuel cell system ) 是由 王天喜 贺萍 裴素朋 于 2019-10-14 设计创作，主要内容包括：本发明涉及一种用于氢燃料电池系统的集成化模拟受控DC/DC变换器,包括PWM信号发生器和功率器件,功率器件的输入端连接氢燃料电池电堆,功率器件的输出端连接负载,PWM信号发生器的输入信号包括输入电压信号、输入电流信号、输出电压信号、输出电流信号,输入电压信号、输入电流信号、输出电压信号、输出电流信号同时传输至电堆监控系统的输入端,PWM信号发生器与电堆监控系统通过模拟信号连接,模拟信号来自电堆监控系统,PWM信号发生器的输出端连接功率器件,并控制功率器件的输出功率；本发明能够防止电压过高或者过低,避免了电堆的启停,延长了电堆的使用寿命,且成本低廉,实时性好。(The invention relates to an integrated analog controlled DC/DC converter for a hydrogen fuel cell system, which comprises a PWM signal generator and a power device, wherein the input end of the power device is connected with a hydrogen fuel cell stack, the output end of the power device is connected with a load, the input signal of the PWM signal generator comprises an input voltage signal, an input current signal, an output voltage signal and an output current signal, the input voltage signal, the input current signal, the output voltage signal and the output current signal are simultaneously transmitted to the input end of a stack monitoring system, the PWM signal generator is connected with the stack monitoring system through an analog signal, the analog signal comes from the stack monitoring system, and the output end of the PWM signal generator is connected with the power device and controls the output power of the power device; the invention can prevent the voltage from being too high or too low, avoids the start and stop of the galvanic pile, prolongs the service life of the galvanic pile, and has low cost and good real-time property.)
1. An integrated analog controlled DC/DC converter for a hydrogen fuel cell system, characterized by: the hydrogen fuel cell stack power generation system comprises a PWM signal generator (1) and a power device (2), wherein the input end of the power device (2) is connected with a hydrogen fuel cell stack (3), the output end of the power device (2) is connected with a load (4), input signals of the PWM signal generator (1) comprise input voltage signals, input current signals, output voltage signals and output current signals, the input voltage signals and the input current signals are collected between the power device (2) and the hydrogen fuel cell stack (3), the output voltage signals and the output current signals are collected between the power device (2) and the load (4), the input voltage signals, the input current signals, the output voltage signals and the output current signals are simultaneously transmitted to the input end of a stack monitoring system (5), and the PWM signal generator (1) is connected with the stack monitoring system (5) through analog signals, the analog signal comes from a galvanic pile monitoring system (5), the galvanic pile monitoring system (5) controls a PWM signal generator (1) through the analog signal, and the output end of the PWM signal generator (1) is connected with a power device (2) and controls the output power of the power device (2).
2. An integrated analog controlled DC/DC converter for a hydrogen fuel cell system as claimed in claim 1, characterized in that: the DC/DC converter and the pile monitoring system (5) are integrated on a PCB.
3. An integrated analog controlled DC/DC converter for a hydrogen fuel cell system as claimed in claim 1, characterized in that: the DC/DC converter enables the DC/DC converter to work in a constant output voltage state by monitoring the output voltage of the power device (2) and adjusting the output pulse width of the PWM signal generator (1).
4. An integrated analog controlled DC/DC converter for a hydrogen fuel cell system as claimed in claim 1, characterized in that: if the output current of the power device (2) exceeds the preset maximum load current, the DC/DC converter works in an output constant current state by adjusting the output pulse width of the PWM signal generator (1); if the output current of the hydrogen fuel cell stack (3) exceeds the preset current, the stack monitoring system (5) adjusts a PWM signal generator (1) of the DC/DC converter through an analog signal, so that the DC/DC converter works in an input constant current state.
5. An integrated analog controlled DC/DC converter for a hydrogen fuel cell system as claimed in claim 1, characterized in that: if the DC/DC converter works in an input constant current state, and the galvanic pile monitoring system (5) detects that the input voltage of the power device (2) is higher than a preset maximum value or lower than a preset minimum value, the galvanic pile monitoring system (5) adjusts the input constant current value of the DC/DC converter through an analog signal, so that the output voltage of the hydrogen fuel cell galvanic pile (3) is stabilized in a preset range.
[ technical field ]
The invention relates to the technical field of fuel cells, in particular to an integrated analog controlled DC/DC converter for a hydrogen fuel cell system.
[ background art ]
In the hydrogen fuel cell management system, a DC/DC converter is connected with a hydrogen fuel cell stack (simply referred to as a stack), and performs voltage conversion and voltage stabilization on unstable voltage output by the stack, and then supplies power to a load. In the existing products, the DC/DC converter is a separate module in the system, and generally operates independently or communicates with a monitoring system in a digital quantity manner to change parameters. In order to protect the galvanic pile and prolong the service life of the galvanic pile, the input current of the DC/DC converter generally adopts a constant current mode to prevent the galvanic pile from overload operation and influencing the service life of the galvanic pile.
At present, the existing DC/DC converter is a split module in a system, when the system is assembled, the process is complex, time and labor are wasted, the occupied volume is large, the cost is high, and the structure is not suitable for a system with low power. In a controlled mode, the DC/DC converter which operates independently has a simple structure, but can not effectively protect the galvanic pile when the performance of the galvanic pile changes because the parameters are fixed; moreover, the DC/DC converter controlled by digital communication requires a special processor and interface chip, which results in high cost. In addition, the input of the DC/DC converter adopts a constant current mode, which can protect the galvanic pile and prolong the service life to a certain extent, but because the performance of the galvanic pile is influenced by various aspects such as air supply quantity, temperature and humidity during operation, the single constant current mode cannot be applied to all situations, and the protection effect is limited. In the control mode, when the output voltage or current of the galvanic pile exceeds the preset value, the galvanic pile monitoring system can stop the galvanic pile, and the galvanic pile is started after the galvanic pile is recovered to be normal, so that the galvanic pile can be damaged in the starting and stopping process, and the service life of the galvanic pile is influenced.
[ summary of the invention ]
The present invention aims to solve the above-mentioned deficiencies and provide an integrated analog controlled DC/DC converter for a hydrogen fuel cell system, which can prevent the voltage from being too high or too low, avoid the start and stop of the stack, prolong the service life of the stack, and has low cost and good real-time performance.
In order to realize the purpose, the integrated simulation controlled DC/DC converter for the hydrogen fuel cell system comprises a
Further, the DC/DC converter is integrated with the
Further, the DC/DC converter operates the DC/DC converter in a state of outputting a constant voltage by monitoring the output voltage of the
Further, if the output current of the
Further, if the DC/DC converter operates in the input constant current state, and the
Compared with the prior art, the invention has the following advantages:
(1) the DC/DC converter and the pile monitoring system are integrated on one PCB, so that the assembly is simplified, the volume is reduced, and the cost is reduced;
(2) the PWM signal generator of the DC/DC converter is connected with the pile monitoring system through the analog signal and is controlled by the monitoring system, and the control mode has the advantages of simple structure, low cost and good real-time property;
(3) in the input mode of the DC/DC converter, the voltage monitoring is added besides the constant current mode, so that the over-high or over-low voltage can be prevented, and the service life of the galvanic pile can be obviously prolonged;
(4) when the output voltage or current of the galvanic pile is abnormal, the invention adjusts the output of the galvanic pile by controlling the parameters of the DC/DC converter, thereby avoiding the start and stop of the galvanic pile and prolonging the service life of the galvanic pile.
[ description of the drawings ]
FIG. 1 is a schematic diagram of the principles of the present invention;
in the figure: 1. the system comprises a
[ detailed description of the invention ]
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1, the present invention provides an integrated analog controlled DC/DC converter for a hydrogen fuel cell system, which includes a
The DC/DC converter and the pile monitoring system are integrated on one PCB, and the invention has small volume and low cost. The DC/DC converter is connected with the pile monitoring system through an analog signal and is controlled by the monitoring system, and the control mode has a simple structure and low cost. In the input mode of the DC/DC converter, besides the constant current mode, the voltage monitoring is also added, the voltage is prevented from being too high or too low, and the service life of the galvanic pile can be obviously prolonged. When the output voltage or current of the galvanic pile is abnormal, the output of the galvanic pile is adjusted by controlling the parameters of the DC/DC converter, thereby avoiding the start and stop of the galvanic pile and prolonging the service life of the galvanic pile.
In the invention, the PWM signal generator controls the power device according to the input and output parameter states and adjusts the output power of the DC/DC converter. The four parts of input voltage acquisition, input current acquisition, output voltage acquisition and output current acquisition transmit acquired signals to the PWM signal generator for adjusting the PWM output state of the PWM signal generator in real time, and simultaneously, the four signals are also transmitted to the electric pile monitoring system, and the electric pile monitoring system controls the PWM signal generator through analog signals after judging and operating according to the input and output states, so that the electric pile works in a better output power state, protects the electric pile, avoids the electric pile from being frequently started and stopped, and prolongs the service life.
The difference between the present invention and the conventional DC/DC converter is that: (1) the DC/DC converter and the pile monitoring system are integrated on a PCB board, so that the assembly is simplified, the volume is reduced, and the cost is reduced. (2) The signals connected with the PWM signal generator comprise input voltage, input current, output voltage, output current and analog signals from the galvanic pile monitoring system, the input signals of the PWM signal generator are more comprehensive, the galvanic pile output constant current control can be realized, and the galvanic pile output voltage can be monitored, so that the galvanic pile output constant current control can work in a safe range. Meanwhile, the control of the pile monitoring system can lead the pile monitoring system to adjust the working state of the DC/DC converter in real time according to other complex parameters, and prevent the pile from being started and stopped frequently. (3) The pile monitoring system is connected with the DC/DC converter through an analog signal, and has the advantages of simple connection mode, low cost and good real-time property.
The working process of the invention is as follows:
in a normal state, the DC/DC converter enables the DC/DC converter to work in an output constant voltage state by monitoring output voltage and adjusting the output pulse width of the PWM signal generator;
if the output current exceeds the preset maximum load current, the DC/DC converter works in an output constant current state by adjusting the output pulse width of the PWM signal generator;
if the output current of the galvanic pile exceeds the preset current, the galvanic pile monitoring system adjusts a PWM signal generator of the DC/DC converter through an analog signal to enable the DC/DC converter to work in an input constant current state;
if the input voltage is detected to be higher than the preset maximum value or lower than the preset minimum value when the DC/DC converter works in the input constant current state, the pile monitoring system adjusts the input constant current value of the DC/DC converter through the analog signal, and the output voltage of the pile is stabilized in the preset range.
When the control mode of the traditional DC/DC converter monitors that the output current or voltage of the galvanic pile exceeds a preset value, the galvanic pile monitoring system can close the galvanic pile and then open the galvanic pile when the galvanic pile is recovered to be normal. The inside of the galvanic pile is damaged when the galvanic pile is started or stopped, and the service life of the galvanic pile is greatly reduced when the galvanic pile is frequently started or stopped. The control mode of the invention avoids frequent closing and opening of the galvanic pile in the working process, reduces the damage of the galvanic pile caused by starting and stopping, and prolongs the service life of the galvanic pile.
The present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents and are included in the scope of the present invention.
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