CN101685869B - Fuel cell stabilizing device and stabilizing method - Google Patents

Abstract

The invention relates to a fuel cell stabilizing device and a stabilizing method thereof, which comprises a direct current voltage converter, a direct current voltage detector, an output current adjusting module, a voltage judging module, a temperature detector and a first condition judging module. The direct current voltage converter is used for converting direct current generated by the fuel cell into output power. The DC voltage detector is used for detecting the voltage of the DC. The output current adjusting module is used for adjusting the current of the output power according to the voltage of the direct current. The voltage judging module is used for judging whether the voltage of the direct current exceeds the protection voltage of the fuel cell. The temperature detector is used for detecting the temperature of the fuel cell. The first condition judging module is used for judging whether the voltage of the direct current and the temperature of the fuel cell meet a first preset condition when the voltage of the direct current is higher than the protection voltage of the fuel cell.

Description

Fuel cell stabilizing device and stabilizing method

technical field

The invention relates to a fuel cell control device, and in particular to a fuel cell stabilizing device and a stabilizing method. the

Background technique

Energy is the source of power for all economic activities and is closely related to social and economic development. So far, the sources of global energy include fossil energy (such as oil, natural gas, and coal), nuclear energy, hydropower, geothermal energy, and solar energy. Among them, fossil energy has the highest proportion, followed by nuclear energy. As for hydropower, geothermal energy, and solar energy The ratio of such shares is quite low. After the combustion of fossil energy, carbon dioxide, nitrogen oxides, sulfur oxides, and hydrocarbons will be produced. In the past, in the blind pursuit of economic growth, serious air pollution and greenhouse effects have been caused by extensive use. How to curb greenhouse gas emissions has become a issues of great international concern. the

Fuel cell is a new power generation technology other than wind power, water power, thermal power, nuclear power and solar power generation technologies. Fuel combustion produces heat to do work. It uses the principle of electrochemistry to directly convert the chemical energy in the fuel into electrical energy and release water and heat energy. It has slight pollution and high energy conversion efficiency. The fuel it needs is mainly "hydrogen" ", at present hydrogen has been classified as a new energy source. This provides an ideal new energy source for human beings who are deeply troubled by environmental pollution and energy shortage. the

However, fuel cells still have some shortcomings and bottlenecks that need to be overcome. Generally, the direct current generated by fuel cells is not stable. In view of this, a fuel cell stabilizing device and a fuel cell stabilizing method are needed. the

Contents of the invention

The technical problem to be solved by the present invention is to provide a fuel cell stabilizing device. the

Another object of the present invention is to provide a fuel cell stabilization method. the

In order to achieve the above object, according to an embodiment of the present invention, the present invention provides a fuel cell stabilizing device, which includes a DC voltage converter, a DC voltage detector, an output current adjustment module, a voltage judging module, a temperature detector, and a first A condition judgment module. The DC voltage converter is used to convert the DC power generated by the fuel cell into output power. The DC voltage detector is used to detect the voltage of the DC. The output current adjustment module is used for adjusting the current of the output power according to the voltage of the direct current. The voltage judging module is used to judge whether the voltage of the direct current exceeds the protection voltage of the fuel cell. The temperature detector is used for detecting the temperature of the fuel cell. The first condition judging module is used to judge whether the voltage of the direct current and the temperature of the fuel cell satisfy a first predetermined condition when the voltage of the direct current is higher than the protection voltage of the fuel cell, wherein the first predetermined condition is the direct current The voltage of the fuel cell is higher than a first predetermined voltage, and the temperature of the fuel cell is lower than a predetermined temperature, wherein the first predetermined voltage is higher than the protection voltage. the

In order to achieve the above object, according to another embodiment of the present invention, the present invention also provides a method for stabilizing a fuel cell, which includes multiple steps. First, the DC power generated by the fuel cell is converted into output power through a DC voltage converter. Then, detect the voltage of the direct current. Next, the current of the output power is adjusted according to the voltage of the direct current. Next, it is judged whether the voltage of the direct current exceeds the protection voltage of the fuel cell. Next, the temperature of the fuel cell is detected. Next, when the voltage of the direct current is higher than the protection voltage of the fuel cell, it is judged whether the voltage of the direct current and the temperature of the fuel cell meet a first predetermined condition, wherein the first predetermined condition is that the voltage of the direct current is higher than a A first predetermined voltage, and the temperature of the fuel cell is lower than a predetermined temperature, wherein the first predetermined voltage is higher than the protection voltage. the

Compared with the prior art, the present invention has obvious advantages and beneficial effects. By virtue of the above technical solutions, the present invention can achieve considerable technical advancement and practicality, and has the advantage of stabilizing the fuel cell. the

In summary, the fuel cell stabilizing device and the fuel cell stabilizing method of the present invention have the characteristics of adjusting the current of the output power according to the voltage of the direct current, and the fuel cell stabilizing device and the fuel cell stabilizing method can be used in suitable technical links. The present invention has the above-mentioned many advantages and practical value, and it has great improvement no matter in product structure or function, has remarkable progress in technology, and produces easy-to-use and practical effects. the

In the following, various embodiments will be used to describe the above description and the following implementation manners in detail, and provide further explanations for the present invention. the

Description of drawings

In order to make the stated and other objects, features, advantages and embodiments of the present invention more obvious and understandable, the detailed description of the accompanying drawings is as follows:

Fig. 1 is a functional block diagram of a fuel cell stabilizing device according to an embodiment of the present invention;

Fig. 2 is a flow chart of a fuel cell stabilizing device according to another embodiment of the present invention;

Fig. 3 is a flowchart of a fuel cell stabilizing device according to yet another embodiment of the present invention. the

【Description of main component symbols】

100: Fuel cell stabilization device 110: Fuel cell

120: DC voltage converter 140: Fuel cycle unit

150: DC voltage detector 155: DC current detector

160: Temperature detector 170: Output voltage detector

175: Output current detector 180: Energy storage component

210: Voltage judgment module 215: Voltage protection module

220: Protection timing module 225: Restart module

230: The first condition judgment module 235: The first current judgment module

245: Second condition judgment module 250: Second current judgment module

255: Buffer timing module 260: Output current adjustment module

270: Fuel Cycle Control Module 302—320: Steps

Detailed ways

In order to make the description of the present invention more detailed and complete, reference may be made to the following drawings and various embodiments, and the same numbers in the drawings represent the same or similar components. On the other hand, well-known circuit components have not been described in the embodiments in order not to limit the invention unnecessarily. the

Please refer to FIG. 1 , which is a functional block diagram of a fuel cell stabilizing device 100 according to an embodiment of the present invention. In Fig. 1, the fuel cell 110 can be proton exchange membrane fuel cell (PEMFC), alkaline fuel cell (AFC), phosphoric acid fuel cell (PAFC), molten carbonate fuel cell (DMFC), solid oxide fuel cell (SOFC ), direct methanol fuel cell (MCFC) or other fuel cells. the

In this embodiment, the fuel cell stabilization device 100 includes a fuel cycle unit 140 and a fuel cycle control module 270 . The fuel circulation unit 140 is used to supply fuel, water and air to the fuel cell 110 . The fuel circulation control module 270 is used to control the circulation and replenishment of fuel, water and air. The fuel supplied by the fuel cycle unit 140 is mainly hydrogen, and its sources may include coal, petroleum, natural gas, liquefied gas, methanol, ethanol (alcohol), methane, water electrolysis, biogas... and other hydrocarbons. , take out a large amount of hydrogen as fuel, in addition, the fuel is preferably pure hydrogen. Fuel and air are not burned in the fuel cell 110 , but are reacted electrochemically. Hydrogen in the fuel and oxygen in the air combine to form water, so that chemical energy is directly converted into electrical energy. In short, it's a reverse reaction of the water electrolysis process. The remaining fuel can also be sent back to the fuel circulation unit 140 by the fuel cell 110 . The water supplied by the fuel circulation unit 140 can eliminate the heat released by the fuel cell 110, so as to maintain the electrochemical reaction and its reaction temperature stably, and the water produced by the fuel cell 110 through the electrochemical reaction can also be returned to the fuel circulation unit 140 reuse. the

Since the direct current generated by the fuel cell 110 after the electrochemical reaction is not very stable, in this embodiment, the fuel cell stabilizing device 100 further includes a direct current voltage converter 120 . The DC voltage converter 120 is used to convert the DC power generated by the fuel cell 100 into a stable output power, wherein the voltage of the output power is fixed. Accordingly, the DC voltage converter 120 can provide stable output power to the load 190 . the

Please continue to refer to FIG. 1 , in order to make the fuel cell operate in an optimal power output state, the fuel cell stabilizing device 100 further includes a DC voltage detector 150 and an output current adjustment module 260 . In this embodiment, the DC voltage detector 150 is used to detect the voltage of the DC power generated by the fuel cell 110 . The output current adjustment module 260 is used for adjusting the current of the above-mentioned output power according to the voltage of the direct current. For example, if the voltage of the fuel cell 110 increases, the output current of the DC voltage converter 120 is increased, and if the voltage of the fuel cell 110 decreases, the output current of the DC voltage converter 120 is decreased. In this way, the voltage of the direct current of the fuel cell is changed indirectly, so that the fuel cell operates in an optimal power output state. the

However, generally speaking, the state of the fuel cell 110 is not very stable. Therefore, it is necessary to keep track of the state of the fuel cell 110 and continue to control the DC voltage converter 120 . the

In view of this, please continue to refer to FIG. 1 , the fuel cell stabilization device 100 further includes a voltage judgment module 210 and a voltage protection module 215 . In this embodiment, the voltage judging module 210 is used to judge whether the voltage of the direct current generated by the fuel cell 110 exceeds the protection voltage of the fuel cell 110, wherein the protection voltage is determined according to the maximum voltage that different fuel cells can supply in a safe state. Defined, of course, different fuel cells may have different protection voltages, and the same type of fuel cells determines the protection voltage of this type of fuel cell according to the number of membrane electrode groups. The voltage protection module 215 is used for shutting down the DC voltage converter 120 when the voltage of the DC power generated by the fuel cell 110 is lower than the protection voltage of the fuel cell 110 . In this way, it is avoided that the voltage of the direct current generated by the fuel cell 110 exceeds its capacity to cause damage to the fuel cell 110 itself. the

In addition, the fuel cell stabilization device 100 further includes a protection timer module 220 and a restart module 225 . In this embodiment, the protection timing module 220 is used to calculate a period of protection time according to the characteristics of the fuel cell 110 when the voltage of the direct current generated by the fuel cell 110 exceeds the above protection voltage. During this protection time, the voltage of the direct current generated by the fuel cell 110 should drop below the above protection voltage. The restart module 225 is used for restarting the DC voltage converter 120 after the protection time expires, and the DC voltage converter 120 converts the DC power generated by the fuel cell 100 into output power. the

In FIG. 1 , the fuel cell stabilization device 100 further includes a temperature detector 160 . In this embodiment, the temperature detector 160 is used to detect the temperature of the fuel cell 100 . It should be understood that, according to the characteristics of the fuel cell 110, the voltage of the direct current generated by the fuel cell 110 is related to the temperature of the fuel cell 110. the

In view of this, in order to ensure that the fuel cell 110 operates under normal voltage and temperature, the fuel cell stabilization device 100 further includes a first condition judging module 230 , a DC current detector 155 and a first current judging module 235 . In this embodiment, the first condition judging module 230 is used to judge the voltage generated by the fuel cell 110 when the voltage of the direct current generated by the fuel cell 110 is higher than the protection voltage of the fuel cell 110 or after restarting the DC voltage converter 120 Whether the voltage of the direct current and the temperature of the fuel cell 110 satisfy a first predetermined condition, wherein the first predetermined condition is that the voltage of the direct current generated by the fuel cell 110 is greater than the first predetermined voltage, and the temperature of the fuel cell 110 is lower than a predetermined temperature, wherein the predetermined The temperature is set according to the characteristics of the fuel cell 110 . In addition, the first predetermined voltage should be set to be greater than the protection voltage of the fuel cell 110 . This means that when the temperature of the fuel cell 110 is low, the voltage is low, and it is not suitable to draw too much current, otherwise the fuel cell 110 will collapse. the

In order to prevent the current of the direct current generated by the fuel cell 110 from being too large when the first predetermined condition is met. In this embodiment, the DC current detector 155 is used to detect the DC current generated by the fuel cell 110 . The first current judging module 235 is used for judging whether the current of the direct current generated by the fuel cell 110 exceeds the rated current of the fuel cell 110 when the voltage of the direct current generated by the fuel cell 110 and the temperature of the fuel cell 110 meet the first predetermined condition . Of course, the rated current of different fuel cells may be different, and the rated current of the fuel cell of the same type is determined according to the number of membrane electrode groups. the

On the other hand, when the temperature of the fuel cell 110 is high, the voltage will be higher, so when the current is drawn a little more, the voltage drop of the fuel cell 110 will not exceed the protection point of collapse. Therefore, the fuel cell stabilization device 100 may further include a second condition judging module 245 and a second current judging module 250 . In this embodiment, the second condition judging module 245 is used to judge the voltage and Whether the temperature of the fuel cell 110 satisfies the second predetermined condition, wherein the second predetermined condition is that the voltage of the direct current generated by the fuel cell 110 is higher than the second predetermined voltage, and the temperature of the fuel cell 110 is higher than the aforementioned predetermined temperature, wherein the second The predetermined voltage should be set to be less than the above-mentioned first predetermined voltage and greater than the protection voltage of the fuel cell 110 . the

In order to prevent the current of the direct current generated by the fuel cell 110 from being too large when the second predetermined condition is satisfied. In this embodiment, the current detector 155 is used to detect the current of the direct current generated by the fuel cell 110 . The second current judging module 250 is used for judging whether the current of the direct current generated by the fuel cell 110 exceeds the rated current of the fuel cell 110 when the voltage of the direct current generated by the fuel cell 110 and the temperature of the fuel cell 110 meet the second predetermined condition. current. the

In order to make the fuel cell 100 operate in an optimal power output state, the fuel cell stabilizing device 100 further includes a buffer timing module 255 . In this embodiment, the buffer timing module 255 is used to calculate a period of buffer time according to the characteristics of the fuel cell 110 when the DC current generated by the fuel cell 110 is lower than the rated current of the fuel cell 110, wherein the buffer time can be determined according to the actual situation. The system status is adjusted. The output current adjustment module 255 can adjust the current of the output power of the DC voltage converter 120 after the buffer time has elapsed. In this way, the voltage of the direct current of the fuel cell is changed indirectly, so that the fuel cell operates in an optimal power output state. the

It is worth noting that the above-mentioned voltage judging module 210, voltage protection module 215, protection timing module 220, restart module 225, first condition judging module 230, first current judging module 235, second condition judging module 245, second The current judgment module 250, the buffer timing module 255, the output current adjustment module 260, and the fuel cycle control module 270 can be implemented as software programs or hardware circuits, and the applicable implementation can be flexibly selected depending on the current design and needs. It does not need to be all software programs or all hardware circuits at the same time. In this embodiment, the voltage judgment module 210, the voltage protection module 215, the protection timing module 220, the restart module 225, the first condition judgment module 230, the first current judgment module 235, the current protection module 240, the second condition judgment module 245, The second current determination module 250 , the buffer timing module 255 , the output current adjustment module 260 and the fuel cycle control module 270 can be integrated into the microprocessor 130 . the

In addition, in order to measure the output power of the DC voltage converter 120 , the fuel cell stabilization device 100 may further include an output voltage detector 170 and an output current detector 175 . In this embodiment, the output voltage detector 170 is used to detect the voltage of the output power of the DC voltage converter 120 . The output current detector 175 is used for detecting the current of the output power of the DC voltage converter 120 . Thereby, the output power of the DC voltage converter 120 can be calculated according to the voltage and current of the output power of the DC voltage converter 120 . the

In addition, to prevent the DC voltage converter 120 from being turned off, no power is supplied to the load 190 . The fuel cell stabilization device 100 also includes an energy storage assembly 180 . In this embodiment, the energy storage component 180 is used to store a part of the output power of the DC voltage converter 120 as electrical energy. It should be noted that if the DC voltage converter 120 is turned off, the energy storage component 180 can supply the stored electric energy to the load 190 . In practical application, the energy storage component 180 may be a battery, a capacitor or other components capable of storing electric energy.

In order to make the description of the present invention more detailed and complete, please refer to FIG. 2 , which is a flowchart of a fuel cell stabilization method 200 according to another embodiment of the present invention. In FIG. 2 , first, in step 302 , the DC power generated by the fuel cell is converted into output power through a DC voltage converter, wherein the voltage of the output power is fixed. In step 318 : detecting the voltage of the direct current generated by the fuel cell, and adjusting the current of the output power according to the voltage of the direct current. For example, when the voltage of the fuel cell increases, the output current of the DC voltage converter is increased, and when the voltage of the fuel cell decreases, the output current of the DC voltage converter is decreased. In this way, the voltage of the direct current of the fuel cell is changed indirectly, so that the fuel cell operates in an optimal power output state. the

However, in general, the state of a fuel cell is not very stable. Therefore, it is necessary to keep track of the state of the fuel cell and continue to control the DC voltage converter. In view of this, the implementation of the fuel cell stabilizing method will be described in more detail below with reference to FIG. 3 . the

Please refer to FIG. 3 , in step 304 , it is determined whether the voltage of the direct current exceeds the protection voltage of the fuel cell. Next, in step 306, when the voltage of the direct current is lower than the protection voltage of the fuel cell, the direct current voltage converter is turned off. In this way, it is avoided that the voltage of the direct current generated by the fuel cell exceeds its capacity to cause damage to the fuel cell itself. the

Next, in step 308, when the voltage of the direct current exceeds the protection voltage, a protection time is calculated, and it is judged whether the protection time is exceeded. During this protection time, the voltage of the direct current generated by the fuel cell should drop below the above protection voltage. After the protection time expires, in step 310, restart the DC voltage converter, which converts the DC power generated by the fuel cell into output power. the

It should be understood that, according to the characteristics of the fuel cell, the voltage of the direct current generated by the fuel cell is related to the temperature of the fuel cell. Therefore, after the DC voltage converter is restarted in step 310, or after it is determined in step 304 that the voltage of the DC power exceeds the protection voltage of the fuel cell. In order to ensure that the fuel cell operates under normal voltage and temperature. In step 312, detect the temperature of the fuel cell, and determine whether the voltage of the direct current and the temperature of the fuel cell meet a first predetermined condition, wherein the first predetermined condition is that the voltage of the direct current is higher than the first predetermined voltage, and The temperature of the fuel cell is lower than a predetermined temperature, wherein the predetermined temperature is set according to the characteristics of the fuel cell. In addition, the first predetermined voltage should be set higher than the protection voltage of the fuel cell. This means that when the temperature of the fuel cell 110 is low, the voltage is low, and it is not suitable to draw too much current, otherwise the fuel cell 110 will collapse. the

In addition, in order to prevent the current of the direct current generated by the fuel cell from being too large, then, in step 314, the current of the direct current is detected, and it is judged whether the current of the direct current exceeds the rated current of the fuel cell. the

On the other hand, if it is judged in step 312 that the voltage of the direct current and the temperature of the fuel cell do not meet the first predetermined condition, in order to further determine whether the voltage and temperature of the fuel cell are normal or not, in step 320, it is judged that the Whether the voltage of the direct current and the temperature of the fuel cell meet the second predetermined condition, wherein the second predetermined condition is that the voltage of the direct current is higher than the second predetermined voltage, and the temperature of the fuel cell is higher than the above predetermined temperature, wherein the first The second predetermined voltage should be set to be lower than the above-mentioned first predetermined voltage and higher than the protection voltage. In this way, it means that when the temperature of the fuel cell 110 is high, the voltage will be higher, so when the current draws a little more, the voltage dropped by the fuel cell 110 will not exceed the protection point of collapse. the

In addition, in order to prevent the current of the direct current generated by the fuel cell from being too large, then, in step 314, the current of the direct current is detected, and it is determined whether the current of the direct current exceeds the rated current of the fuel cell. the

If it is detected in step 314 that the current of the direct current is lower than the rated current of the fuel cell. Next, in step 316, a buffer time is calculated according to the characteristics of the fuel cell, and it is judged whether the buffer time is exceeded, wherein the buffer time can be adjusted according to the actual system status. After the buffer time elapses, in step 318 , the current of the output power of the DC voltage converter is adjusted. In this way, the voltage of the direct current of the fuel cell is changed indirectly, so that the fuel cell operates in an optimal power output state. the

In addition, in order to measure the output power of the DC voltage converter, the fuel cell stabilizing method may further include: detecting the voltage and current of the output power. Thereby, the output power of the DC voltage converter can be calculated according to the voltage and current of the output power of the DC voltage converter. the

In addition, in order to avoid that the DC voltage converter is turned off, no power is supplied to the load. The fuel cell stabilization method may further include storing a portion of the output power as electrical energy. If the DC voltage converter is turned off, the electric energy can be supplied to the load. In practical application, the energy storage component can be used to store the electric energy, wherein the energy storage component can be a battery, a capacitor or other components capable of storing electric energy. the

In addition, in this embodiment, the method for stabilizing the fuel cell may further include: providing fuel, water and air to the fuel cell, and controlling circulation and replenishment of the fuel, water and air. In this way, the fuel cell combines the hydrogen in the fuel and the oxygen in the air into water through an electrochemical reaction, allowing the chemical energy to be directly converted into electrical energy. the

Although the present invention has been disclosed above with the embodiments, it is not intended to limit the present invention. Any person familiar with this technology can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, this The scope of protection of the invention shall prevail as defined by the appended claims.

Claims (10)

1. a fuel cell stabilizing arrangement is characterized in that, comprises:

One direct current electric pressure converter converts an output power in order to the direct current that a fuel cell is produced, and wherein the voltage of this output power is fixed;

One direct current detecting voltage device is in order to this galvanic voltage of detecting;

One output current regulation module in order to according to this galvanic voltage, is adjusted the electric current of this output power;

Whether one voltage judge module surpasses the protection voltage of this fuel cell in order to judge this galvanic voltage;

One temperature detecting device is in order to detect the temperature of this fuel cell; And

One first condition judge module; In order to when this galvanic voltage is higher than the protection voltage of this fuel cell; Whether the temperature of judging this galvanic voltage and this fuel cell satisfies one first predetermined condition; Wherein this first predetermined condition is higher than one first predetermined voltage for this galvanic voltage, and the temperature of this fuel cell is lower than a predetermined temperature, and wherein this first predetermined voltage is higher than this protection voltage.

2. fuel cell stabilizing arrangement according to claim 1 is characterized in that, also comprises:

One voltage protection module in order to when this galvanic voltage is lower than the protection voltage of this fuel cell, is closed this dc voltage changer;

One protection timing module when protecting voltage in order to surpass this at this galvanic voltage, calculates a guard time; And

One restarts module, in order to after this guard time, restarts this dc voltage changer.

3. fuel cell stabilizing arrangement according to claim 2 is characterized in that, also comprises:

The DC current detector is in order to this galvanic electric current of detecting; And

One first electric current judge module when satisfying this first predetermined condition in order to the temperature at this galvanic voltage and this fuel cell, judges whether this galvanic electric current surpasses the rated current of this fuel cell.

4. fuel cell stabilizing arrangement according to claim 3 is characterized in that, also comprises:

One second condition judge module; In order to when this first predetermined condition of temperature unmet of this galvanic voltage and this fuel cell; Whether the temperature of judging this galvanic voltage and this fuel cell satisfies one second predetermined condition; Wherein this second predetermined condition is higher than one second predetermined voltage for this galvanic voltage, and the temperature of this fuel cell is higher than this predetermined temperature, and wherein this second predetermined voltage is less than this first predetermined voltage and greater than this protection voltage; And

One second electric current judge module when satisfying this second predetermined condition in order to the temperature at this galvanic voltage and this fuel cell, judges whether this galvanic electric current surpasses the rated current of this fuel cell.

5. fuel cell stabilizing arrangement according to claim 4 is characterized in that, also comprises:

One buffering timing module in order to when this galvanic electric current is lower than the rated current of this fuel cell, calculates a buffer time, and wherein this output current regulation module is adjusted the electric current of this output power again in order to through after this buffer time.

6. fuel cell antihunt means is characterized in that, comprise:

The direct current that one fuel cell is produced converts output power into through a direct current electric pressure converter, and wherein the voltage of this output power is fixed;

Detect this galvanic voltage;

According to this galvanic voltage, adjust the electric current of this output power;

Judge whether this galvanic voltage surpasses the protection voltage of this fuel cell;

Detect the temperature of this fuel cell; And

When this galvanic voltage is higher than the protection voltage of this fuel cell; Whether the temperature of judging this galvanic voltage and this fuel cell satisfies one first predetermined condition; Wherein this first predetermined condition is higher than one first predetermined voltage for this galvanic voltage; And the temperature of this fuel cell is lower than a predetermined temperature, and wherein this first predetermined voltage is higher than this protection voltage.

7. fuel cell antihunt means according to claim 6 is characterized in that, also comprise:

When this galvanic voltage is lower than the protection voltage of this fuel cell, close this dc voltage changer;

When this galvanic voltage surpasses this protection voltage, calculate a guard time; And

After this guard time, restart this dc voltage changer.

8. fuel cell antihunt means according to claim 7 is characterized in that, also comprise:

Detect this galvanic electric current; And

When the temperature of this galvanic voltage and this fuel cell satisfies this first predetermined condition, judge whether this galvanic electric current surpasses the rated current of this fuel cell.

9. fuel cell antihunt means according to claim 8 is characterized in that, also comprise:

When this first predetermined condition of temperature unmet of this galvanic voltage and this fuel cell; Whether the temperature of judging this galvanic voltage and this fuel cell satisfies one second predetermined condition; Wherein this second predetermined condition is higher than one second predetermined voltage for this galvanic voltage; And the temperature of this fuel cell is higher than this predetermined temperature, and wherein this second predetermined voltage is less than this first predetermined voltage and be higher than this protection voltage; And

When the temperature of this galvanic voltage and this fuel cell satisfies this second predetermined condition, judge whether this galvanic electric current surpasses the rated current of this fuel cell.

10. fuel cell antihunt means according to claim 9 is characterized in that, also comprise:

When this galvanic electric current is lower than the rated current of this fuel cell, calculate a buffer time; And

Through after this buffer time, adjust the electric current of this output power.

Images