TWI253201B - High-efficiency fuel cell power conditioning mechanism with high-order resonant framework as well as closed-loop control - Google Patents

Abstract

The aim of this invention is to develop a high-efficiency fuel cell power conditioning mechanism with high-order resonant framework as well as closed-loop control. Fuel cell is operated in the sense of electrochemical principle for converting chemical energy directly into electrical energy. This process produces higher conversion efficiency than conventional thermal-mechanical system because the system has the salient features of quiet operations without pollution. In order to reduce the overall operating cost of a fuel cell system and to satisfy the utility AC power demand, this invention investigates a high-efficiency fuel cell power conditioning mechanism with a simple framework. In general, the methodology for inverting DC voltage into low-frequency AC voltage is usually generated by the pulse-width-modulation (PWM) technique. However, the PWM-type inverter output has high-frequency harmonic components, electro-magnetic-interference (EMI) and high-frequency switching loss. Firstly, a boost converter is utilized to raise the DC voltage in the fuel cell output for overcoming the voltage variation problem of the fuel cell with respect to load change. Moreover, a novel power inverter via the LLCC resonant technique is designed for inverting DC voltage into 60 Hz AC sinwave voltage with low harmonic components in this power conditioning mechanism. This circuit scheme has the properties of soft-switching property, high power conversion efficiency and simplified implementation, and no EMI problem. However, the voltage gain of this LLCC resonant inverter is varied according to the nonlinear factors of the switching frequency drift, the load effect, the variation of fuel cell output voltage, and the resonant component parameter perturbation due to heat and magnetic saturation. Therefore, this invention further introduces a closed-loop control scheme to increase the system sensitivity and bandwidth for alleviating the effect induced by nonlinear factors. The novel power conditioning mechanism developed in this invention will be to rise the utility rate for energy, reduce the pollution of the environment, and increase the stability of power supply. It also can be utilized for other power generating types with the necessary of DC/AC power conversion.

Description

1253201 玖Invention Description: [Technical Field] The present invention aims to develop a high-efficiency fuel cell 101 power regulating device with a high-order resonant architecture and closed loop control, and the technical field involved is quite extensive, including chemical engineering and machinery. Heat flow, power electronics, control engineering and energy technology are many different areas. The fuel cell 101 directly converts chemical energy into electric energy by using the principle of electrochemical reaction, and the power generation process is noise-free and the output is free from any pollution, so that the power generation efficiency is superior to that of the conventional internal combustion engine system. The DC power source is provided by the fuel cell 101, and the DC voltage level is raised by the boost converter 106 to overcome the change of the output voltage of the fuel cell 101 with the load, and the DC voltage is directly oscillated into a 60 Hz AC sine using the high-order LLCC resonance principle. The voltage, the resonant circuit has the characteristics of flexible switching characteristics, high power conversion efficiency, and easy implementation, and has no electromagnetic interference problem. However, the voltage gain of this high-order LLCC resonant inverter 107 is subject to change due to switching frequency offset, load effects, and nonlinear factors that cause variations in the parameters of the resonant element due to heat generation and magnetic saturation. Therefore, the closed loop control mechanism is further used to increase the system sensitivity and bandwidth to reduce the effects of nonlinear factors. The power regulating device developed by the invention can greatly improve the energy utilization rate, reduce the environmental pollution and increase the stability of the power supply, and can also apply the technology of the present invention to other direct current power conversion devices of different power generation types. [Prior Art] The energy of nature is not an inexhaustible resource, and the environmental pollution caused by energy development is a dangerous 123201 machine that all things on the earth face. In addition, the conversion efficiency of traditional energy sources is not high. Therefore, in the face of energy shortage, improving energy conversion efficiency is an urgent task. The fuel cell 101 directly converts chemical energy into electrical energy by utilizing the principle of electrochemical reaction, and the power generation process is noise-free and the output is free from any pollution, so that the power generation efficiency is superior to that of the conventional internal combustion engine system. The fuel cell 101 is not really a battery, but an environmentally friendly generator. Compared with a general battery, although the chemical energy is converted into electric energy by an electrochemical reaction, the reactant of the fuel cell 101 is not sealed in the reactor, but must be continuously supplied from the external source to the electrode to continuously generate electricity. Therefore, in theory, the life of the fuel cell 101 is unlimited. However, the fuel cell 101 has a low voltage and high current power generation characteristic, and its output voltage is easily changed with the load change. Therefore, a boost converter 106 is required to raise the DC voltage level, and the DC/AC inverter module is supplied. Rated input voltage value. On the other hand, power electronics equipment widely uses chopping technology and diode rectification and filtering circuits. The power input/output side contains high harmonic current, which is the main killer of voltage waveform distortion. Further, the breaking of heavy equipment For example, elevators, steel industry and other periodic loads cause frequent voltage changes. These voltage drops may cause malfunction of the 1C components. Therefore, power supply equipment with low voltage variation rate and complete voltage waveform is a necessary condition for good power supply quality. Here, a high-performance DC/AC inverter module is required. However, the widely used inverter has its output voltage controlled by sinusoidal pulse width modulation, which produces an analog sinusoidal voltage waveform with high waveform. Frequency harmonic components are prone to electromagnetic interference problems. In order to solve the electromagnetic interference problem and improve the efficiency and improve the waveform, experts and scholars have successively proposed the oscillating 1253201 type and flexible switching technology. For these studies, it can be summarized as high frequency inverter, inverter or high frequency LC resonance as carrier. The low frequency AC voltage waveform composed. Referring to the previous literature, there is no mention of the research of low-frequency resonance technology. The main reason is that under low-frequency operation, the quality factor is too low and it is susceptible to its influence, which affects the voltage gain. It cannot be fixed frequency operation, and the circulation and waveform distortion cannot be effectively improved. Disadvantages. Therefore, the high-order LLCC resonant inverter 107 is directly resonated in the low frequency region, and the inverter power semiconductor switch has the advantages of low frequency and flexible switching. The sinusoidal voltage waveform with low harmonic generation has no second-order resonant high circulating current problem. Electromagnetic interference problems can also be suppressed. However, the voltage gain of this high-order LLCC resonant inverter 107 is subject to change due to switching frequency offset, load effects, and non-linear factors that cause resonance element parameters to change due to heat generation and magnetic saturation. In order to overcome these problems, the present invention employs a closed loop control mechanism whose purpose is to increase the stability of the system. Based on the above reasons, the power regulating device developed by the present invention can greatly improve the energy utilization rate, reduce environmental pollution, and increase the stability of the power supply. The present invention can also be applied to other direct current power conversion devices of different power generation types. SUMMARY OF THE INVENTION The present invention utilizes a fuel cell 101 as a DC power source, boosts a DC voltage level via a boost converter 106, and obtains a 60 Hz AC sinusoidal voltage with a high order LLCC resonant inverter 107. First, the DC output voltage value of the fuel cell 1〇1 is boosted to the DC voltage value of the rated input of the high-order LLCC resonant inverter 107, and then combined with the pulse width modulation circuit 103 by the feedback circuit 102. Closed-loop control mechanism to obtain better 1253201 linearity adjustment and load regulation performance, and to make circuit verification theory feasible. The invention improves the principle and the control effect of the prior art as follows: 1. The power supply end is provided by the fuel cell 101: the power regulating device developed by the invention is combined with the fuel cell 101 to convert its DC power into an AC power source for general electrical use. Supplies. 2. The output of the high-order LLCC resonant inverter 107 is a sinusoidal voltage waveform: Using the high-order LLCC resonance principle, the DC voltage is directly oscillated into a 60Hz AC sinusoidal voltage with a low harmonic amount. The resonant circuit has flexible switching characteristics and high power. Conversion efficiency and ease of implementation, and no electromagnetic interference problems. 3. The high-order LLCC resonant inverter 107 allows a low quality factor, so the capacity of the LC resonant component can be greatly reduced: the higher the quality factor, the higher the stored energy of the resonant component is than the load consumption; in other words, the resonant component current is proportional to the load. Current, the ratio of power semiconductor switching current to load is lower. If the quality factor is too low, the load terminal can only obtain the square wave voltage and lose the original meaning of resonance. The second-order resonant frequency is %=l/Vi, and the resonant frequency of the general literature is mostly above kHz. If it drops to 60Hz, the L and C values and capacity of the resonant component will increase by more than 100 times. Theoretically, the high-order LLCC resonant inverter 107 operates at a geometric mean frequency. The output voltage is completely independent of the load. The stored energy of the resonant component is proportional to the load consumption, thus greatly reducing the value and capacity of the resonant component. 4. Low-loop current and low-load waveform distortion rate at light load: The high-order LLCC resonant inverter 107 is composed of two sets of resonant tanks, one consisting of a heart and Q, 11 1253201 series vibration tank, and the other group is A parallel resonant tank is formed by Zp and Cp. When the load is light load (high quality factor), the parallel resonator storage energy is greater than the series vibration tank, which is enough to provide the sinusoidal waveform required by the load, avoiding the problem of light carrier shape distortion of the second-order series resonance. The parallel resonant tank only needs to design the energy to supply the light load. Therefore, the circulating current is small and natural oscillation does not pass through the power semiconductor switching element, and the series resonant tank only needs a small amount of current to maintain the resonance required; when the load is heavy When the quality factor is low, the parallel resonant tank will not store enough energy to provide the load. At this time, the series resonant tank current increases greatly, increasing its stored energy to supply the load. Theoretically, when the switching frequency is equal to the geometric mean frequency, the impedance of the series resonant tank is zero, but the current is large but flows through the series resonant tank without voltage drop, which in turn leads to a low waveform distortion rate at heavy loads. 5. Closed loop control mechanism: The output voltage of the fuel cell 101 varies with the load and the voltage gain of the high-order LLCC resonant inverter 107 changes due to nonlinear factors, and a stable sinusoidal voltage waveform can be achieved by the closed loop control mechanism. 6. The power semiconductor switch of the high-order LLCC resonant inverter 107 has low frequency and flexible switching, so that the conversion efficiency is high: the loss of the resonant element is related to the frequency increase, and the switching loss of the power semiconductor switch is also proportional to the operating frequency, and the operating frequency is lowered. Under the premise, these losses will be reduced. When the operating frequency is 60 Hz, the square wave voltage waveform of the S power semiconductor switch is synchronized with its sinusoidal current waveform, so there is a zero current switching characteristic (ZCS). [Embodiment] FIG. 1 is a block diagram showing a high-efficiency fuel cell 101 power regulating device with a high-order resonant architecture and closed-loop control disclosed in the present invention. The power regulating device of the present invention provides an AC sinusoidal voltage, and the pure loop stability can be increased by the closed loop control mechanism to overcome the voltage gain of the high-order w(2)-vibration inverter iG7 due to switching frequency offset and load effect. And the problem that the nonlinearity of the parameters of the vibrating element changes due to heat and magnetic saturation. The fifth is the DC output voltage value of the fuel cell 101, and the magnitude of the output voltage changes as the load changes. When the load reaches 3 watts of output, the voltage and the range of the voltage are between 40 volts and 27 volts. Therefore, the pulse width modulation circuit 103 adjusts the duty cycle ratio so that the boost converter 1〇 6 boost to voltage value ~, its ~ size is determined by the peak value of the rated output AC voltage divided by the voltage gain of the high-order LLCC resonant inverter 1〇7. The output filter capacitor C/c of the fuel cell 101 is intended to eliminate the high-frequency chopping current caused by the boost converter 106, thereby protecting the fuel cell 1〇1. The voltage control frequency circuit 1〇5 generates a 60Hz square wave signal, and the square wave signal is used for phase separation, interlocking, isolation and driving amplification processing of the signal through the driving circuit 104 for driving the power semiconductor switch && & &, where *^ and the driving signals differ by 1 degree, and the driving signals of & and \ are also 180 degrees apart; the driving signals of && are simultaneous conduction and cutoff, the same & & A The drive signals are in phase, which produces a 60 Hz AC square wave voltage (±6 volts) for the resonant circuit. The high-order LLCC resonant inverter 1〇7 is composed of a low-frequency inductor-capacitor element core, Q, heart and 仏, which is a load representing a resonant output of 60 Hz AC sinusoidal voltage & and the geometric mean frequency of the oscillating tank is designed to be 60 Hz. However, when the voltage gain of the high-order LLCC resonant inverter 107 is changed due to the switching frequency offset, the load effect, and the nonlinear factor of the variation of the resonant element parameters due to heat generation and magnetic saturation, the present invention adopts closed loop control for 13 1253201. The mechanism increases the sensitivity and bandwidth of the system to reduce the influence of nonlinear factors. It is mainly composed of the feedback circuit 102 and the pulse width modulation circuit 103. When the output voltage fluctuates, the feedback circuit can be used. 102 obtains the magnitude of the feedback voltage, adjusts the duty cycle ratio through the pulse width modulation circuit 103, and then changes the DC voltage value and size of the input high-order LLCC resonant inverter 107, so that the high-order LLCC resonant inverter 1〇7 The output is a nominal 60 Hz AC sinusoidal voltage peak. In other words, the power regulating device developed by the present invention adjusts the peak value of the AC sinusoidal voltage outputted by the high-order LLCC resonant inverter 1〇7 by the duty cycle ratio of the boost converter 106 to achieve a stable 60 Hz AC sinusoidal voltage. Waveform. The high-order LLCC resonant inverter 107 is described in detail as follows: Definition ^ is the ratio of the input voltage to the output voltage of the high-order LLCC resonant inverter 1〇7, as shown in equation (1). Where is the parallel resonant tank admittance of the first-order llcc resonant inverter 1〇7, as in equation (2); Zw is the total input impedance of the resonant tank of the high-order LLCC resonant regenerator 1〇7, as in equation (3) Shown. Yp = + j ten sCp - j - Rl 1sLp (2) ^IN =j1SLS- j ^ ^Cs Yp (3) Substituting equation (2) and equation (3) into equation (1), so equation (1) can be rewritten as equation (4). 14 (4)1253201

+ /· °hLs 1 J y , Rl > ...叮"f ' can get the maximum voltage gain value, so from equation (4), let apricot Lu Qiu Jie,; f helmet emperor, 7 knife mother Only 邛, and & (ie, imaginary 趋 is also close to zero), then the wheel voltage (pole) is generated, and vice versa + 丨 + vibration frequency ". In time, the smaller the peak 1 or the farther away from the %, the smaller the peak value, so the resonant frequency can be solved, such as the equation (7) lion. Called equation (6), where

^ y Multiply the two vibration frequencies % and % to obtain equation (8). (5) (6) (7) The frequency parameter of (8) is 1. '2 bow with its quality factor t

Shibi vibrating, (Q meaning, due to the frequency used to count A δ white vibration frequency', therefore two resonant frequencies: the number of vibrations is not the same as the Q value is 7, but between the two spectra The curve is more complicated, so that the system is simple V:, t; = kiss equation 4; Γ :: series (a), no. The equation (8) and equation (9) can be used to derive the proportional relationship, as shown in equation (10). Push h vibration 15 (9) 1253201

Rl Q II

Lp 丨 Ls = Cs 丨 CP (10) Frequency The equation (8) and equation (10) can be used to derive (iv) the vibration rate as shown in equation (11). , can average ^01^02 =ι/νζ^"=ι/Τζζ' to define the equation (9) quality with the Q value to define the algebraic equation as shown in equation (12). 01) Write

KLSCP 1sLs — 1sCs ω^3 — 1〇Cs (12)

丄: ί f Substituting square ( (12), when called, when the 'male imaginary part is zero, the mother's real part is -, the voltage is not subject to the change of the f-factor q value, so the equation can be obtained ( 13). P

Gy = 1 The physical meaning is that when the (four)^ temple' series resonant tank impedance is zero, and two: the vibration slot impedance is infinite, the input voltage is directly added and (four) the vibration groove, the electric gain gain GK value is the other The voltage harmonic gain is zero. In principle, the first-order LLCC resonant inverter 1 〇7 does not change its voltage gain due to load changes and the gain is constant. However, under actual conditions, the spectral element is not an ideal component, so there is a load effect problem; Furthermore, the switching frequency shift and the variation of the spectral element parameters due to heat generation and magnetic saturation cause the change in the gain of the P0b LLCC spectral inverting device 1〇7. Another 16 1253201 On the one hand, the fuel cell 101 has a low voltage and high current power generation characteristic, and its output voltage is apt to change with load variation, so the boost converter 106 is required to be boosted to a voltage value ‘. For the above reasons, the present invention overcomes switching frequency offset, load effect problems, and variations in resonant element parameters by a closed loop control mechanism, and adjusts the change in the DC output voltage value of the fuel cell 101. In other words, this power regulating device has a linear adjustment and load adjustment function. Fig. 2 is a view showing the measured voltage and current characteristic curves of the fuel cell 101, which is one of the embodiments of the high-efficiency fuel cell 101 power regulating device with high-order resonant architecture and closed-loop control disclosed in the present invention. (a) is a characteristic curve of voltage and power versus current; (b) is a characteristic curve of current and power versus voltage. From the above measured results, when the output current of the fuel cell 101 is larger, that is, the larger the output power, the output voltage also decreases. Fig. 3 is a circuit diagram showing an embodiment of a high-efficiency fuel cell 101 power regulating device having a high-order resonant architecture and closed loop control according to the present invention. The main circuit diagram 301 is a high current portion of the present invention, and the component specifications of the circuit are

E ·· 25 ~ ring DC vQ: llOVrms ^ 60 Hz

&, &, A, & and V IRFP260N

Db \ SFA1604G

Cfc : 220 //F

Lb: 150 μΗ

Cb : 220 /zF 17 1253201

C5: 60.13 μΡ Ls \ 117 mH CP : 36.08 μΡ LP : 195 mH The feedback circuit 102 is composed of a step-down transformer 302 and a peak detecting circuit 303. The step-down transformer 302 is connected in parallel to the output terminal and the step-down ratio is about 0.055. This signal is passed through the peak detecting circuit 303, and the peak value of the 60 Hz AC sinusoidal voltage can be known. This peak size is based on the law of partial pressure, which gives a three-point feedback value, and U is a five-volt DC voltage command. The two signals are pulse width modulation circuit 103, and the output is a square wave waveform with an adjustable duty cycle ratio, and the current amplification circuit 304 amplifies the signal current to drive the power semiconductor switch & The power of the high-order LLCC resonant converter 107 is composed of a voltage control frequency circuit 105, a phase separation circuit 305, an interlock circuit 306, and an isolated drive amplification circuit 307. The voltage control frequency circuit 105 generates a 60 Hz square wave signal via the phase separation circuit 305, so that the signal is divided into two sets of 0 degree and 180 degree square wave waveforms. The two sets of signals are then subjected to signal delay processing via the interlock circuit 306, and the charge and discharge characteristics of the resistors and capacitors are used to adjust the cutoff time of each of the drive signals to avoid overlapping of the two sets of inverted output square waves at the same time, thereby preventing the same arm from being The power semiconductor switch is turned on at the same time to cause a short circuit. The interlock time is five microseconds. The two sets of inverted signals are processed by the isolated drive amplifying circuit 307 to process the common short circuit problem and amplify the driving current, and use two sets of band: 1C to generate four sets of electrically isolated and amplified signal current driving power semiconductor switches &, &, &; and &. FIG. 4 is a diagram showing an embodiment of a high-efficiency fuel cell ιοί power regulating device with a high-order resonant architecture and a closed loop control 18 1253201 according to the present invention, and an AC voltage and current waveform of various loads. (a) is the voltage and current waveform of the unloaded output, (b) is the voltage and current waveform of the resistive load; (c) is the voltage and current waveform of the inductive load with a power factor of 〇·6; (the power factor is 0.72) The voltage and current waveform of the capacitive load of the collar. The high-efficiency fuel cell 101 power regulating device with high-order resonant architecture and closed-loop control can be verified for operation under various load conditions by the above-described implementation waveform. Figure 5 shows the disclosure of the present invention. One of the embodiments of the high-order resonant architecture and closed-loop control of the fuel cell 1 〇1 power regulating device, the high-order LLCC read-mode inverter 107 power semiconductor switch flexible switching and transient response waveforms. (a) (b) is the voltage and current waveform of the power semiconductor switch & and (c) is 100 watts to 2 watts for the no-load output voltage and current waveforms of the power semiconductor switch & The measured voltage of the output voltage, the output current and the output current of the fuel cell 1〇1 during the instantaneous loading; (d) The power adjustment device is input when the 200W to 100W instantaneous pumping The measured voltage of the voltage, the output current, and the output current of the fuel cell 101. The flexible switching characteristics of the present embodiment and the effect of the closed loop control mechanism are verified by the above-described continuous waveform. Fig. 6 shows a high-order resonant architecture and closed by the present invention. One of the embodiments of the loop control efficiency fuel cell 1 〇 1 power conditioner, the output efficiency of the high-order LLCC oscillating inverter 107. The high-order 1 ^ (: the resonant inverter 107 has a low switching frequency and has a flexible switching characteristic, therefore The switching loss can be greatly reduced, and the efficiency can be improved. [Simplified Schematic] 19 1253201 FIG. 1 is a block diagram showing a high-efficiency fuel cell power regulating device with a high-order resonant architecture and closed-loop control disclosed in the present invention. One of the embodiments of the high-efficiency fuel cell power regulating device disclosed in the high-order resonant architecture and closed loop control, the measured voltage and current characteristic curve of the fuel cell. (a) is a characteristic curve of voltage and power versus current; (b) It is a characteristic curve of current and power versus voltage. Figure 3 shows a high-order resonant architecture disclosed by the present invention. Circuit diagram of one embodiment of high-efficiency fuel cell power regulating device for loop control. FIG. 4 shows one embodiment of a high-efficiency fuel cell power regulating device with high-order resonant architecture and closed-loop control disclosed in the present invention. Voltage and current waveforms: (a) voltage and current waveforms for unloaded output; (b) voltage and current waveforms for resistive loads; (c) voltage and current waveforms for inductive loads; (d) voltage and current for capacitive loads Waveform Figure 5 shows one embodiment of a high-efficiency fuel cell power conditioner with high-order resonant architecture and closed-loop control disclosed in the present invention. The measured waveform of the flexible switching and transient response of the high-order LLCC resonant inverter power semiconductor switch. (a) Measured waveforms for flexible switching at no-load output; (b) Measured waveforms for flexible switching at heavy-duty output; (c) measured waveforms for transient response from 100 watts to 200 watts; (d) 200 watts to 100 watts temporarily The measured waveform of the state reaction. FIG. 6 shows one embodiment of a high-efficiency fuel cell power conditioner with high-order resonant architecture and closed-loop control 20 1253201 disclosed in the present invention, and a high-order LLCC resonant inverter output efficiency. The numbers of the main parts of the figure represent the following meanings: 101: Fuel cell 102: feedback circuit 103: pulse width modulation circuit 104: drive circuit 105: voltage control frequency circuit 106: boost converter 107: high-order LLCC Resonant inverter 301: main circuit diagram 302: step-down transformer 303: peak detection circuit 304: current amplification circuit 305: phase separation circuit 306: interlock circuit 307: isolated drive amplification circuit 21

Claims (1)

1253201 Pickup, Patent Application Range: 1. A high-efficiency fuel cell power conditioner with high-order resonant architecture and closed-loop control, including a fuel cell: an electrochemical reaction mechanism that directly converts chemical energy inside the fuel into electrical energy. Energy for clean and high efficiency conversion; a feedback circuit: can detect the peak value of the 60Hz AC sinusoidal voltage of the power regulating device; a pulse width modulation circuit: the error value is generated by the command signal and the feedback signal, and then Compared with the sawtooth wave, the output is a square wave waveform with adjustable duty cycle ratio; a driving circuit: can be used to drive the power semiconductor switch; a voltage control frequency circuit: can generate a square wave driving signal of 60 Hz.; a boosting commutation The voltage output of the fuel cell is boosted to the DC voltage of the rated input of the high-order LLCC resonant inverter; a high-order LLCC resonant inverter: directly oscillates the DC voltage into a 60Hz AC sinusoidal voltage using the high-order LLCC resonant principle. This patented high-efficiency fuel cell with high-order resonant architecture and closed loop control The power regulating device, wherein the DC output voltage value of the fuel cell is first boosted to a DC voltage value of a rated input of the high-order LLCC resonant inverter via a boost converter; and further, the closed loop control mechanism is used to overcome the cause Switching frequency offset, load effect, DC output voltage variation of fuel cell, and nonlinear factors caused by heat and magnetic saturation caused by fluctuations in resonant element parameters to achieve better linearity adjustment and load regulation performance; The characteristics are (1) the power supply end is provided by the fuel 22 1253201 battery, which is the energy for clean and high efficiency conversion; (2) the output of the high-order LLCC resonant inverter is sinusoidal voltage waveform, and the output voltage waveform has low harmonics. Quantity and no electromagnetic interference problem; (3) closed loop control mechanism can increase system stability to overcome the problems caused by nonlinear factors; (4) high-order LLCC resonant inverter low frequency and flexible switching to obtain higher Power conversion efficiency. 2. A high-efficiency fuel cell power conditioner with a high-order resonant architecture and closed-loop control as described in the first application of the patent application, wherein the fuel cell uses argon as a fuel and is made of a catalyst material such as platinum, silver or nickel. The electrons in the fuel are separated, and the load end is taken out to form a DC power generating device for electron flow. Since the fuel cell directly converts chemical energy into electric energy by using the principle of electrochemical reaction, the power generation process is noiseless and the output is free from any pollution, so the power generation efficiency is obtained. It is superior to the traditional internal combustion engine system; the scope of this patent application includes a fuel cell external capacitor, which is made of a general electrolytic capacitor or a super capacitor, which can eliminate the components of high frequency harmonic current. 3. A high-efficiency fuel cell power conditioner with a high-order resonant architecture and closed-loop control as described in claim 1, wherein the boost converter boosts the DC output voltage of the fuel cell to a DC voltage & , whose size is divided by the peak value of the rated output AC voltage divided by the voltage gain of the high-order LLCC resonant inverter; the scope of the patent application includes a boost converter, a flyback converter, a forward converter A push-pull converter, a full-bridge converter, and a half-bridge converter are used as a DC power conversion device between the fuel cell and the high-order LLCC resonant inverter. 4. A high-efficiency fuel cell power conditioner with a high-order resonant architecture and a closed loop 23 1253201 as described in the first application of the patent application, wherein the high-order LLCC resonant inverter utilizes a high-order LLCC resonant principle to directly oscillate the DC voltage. 60Hz AC sinusoidal voltage, so it has low harmonics and no electromagnetic interference problem; in addition, when the load is light load (high quality factor), the parallel resonant tank stores more energy than the series resonant tank, which is enough to provide the sinusoidal waveform required by the load, avoiding The second-order series resonance is a problem of light carrier-shaped distortion, and the parallel resonant tank only needs to design the energy for supplying light load. Therefore, the circulating current is small and natural oscillation does not pass through the power semiconductor switching element, and the series resonant tank requires only a small amount of current to maintain resonance. When the load is heavy (low quality factor), the parallel resonant tank will not store enough energy to provide the load. At this time, the series resonant tank current increases greatly, increasing its stored energy to supply the load; in theory, When the switching frequency is equal to the geometric mean frequency, the impedance of the series resonant tank is zero, but the current is large but But no voltage drop by the series resonant tank, thus overloading when waveform distortion is low. 5. The high-efficiency fuel cell power regulating device with high-order resonant architecture and closed-loop control as described in claim 1 of the patent application, wherein the high-order LLCC resonant inverter is constructed, and the patent application scope is to adopt two power semiconductor switches. The half-bridge architecture, the full-bridge architecture of four power semiconductor switches or the full-bridge architecture of six power semiconductor switches. 6. The high-efficiency fuel cell power regulating device with high-order resonant architecture and closed-loop control as described in claim 1 of the patent application, wherein the high-order LLCC resonant inverter has a design geometric mean frequency and a switching frequency of 60 Hz, respectively. The power semiconductor switch has a flexible switching effect when turned on, and has the feature of reducing switching loss. 24 1253201 7·If the patent is in the range! The high-efficiency fuel cell power conditioner with high (10) vibrating architecture and closed loop control, wherein the output of the high-order LLcc resonant inverter can supply any resistive, inductive or capacitive load. 8. The high-efficiency fuel cell power regulating device with a high-order resonant structure and a closed loop control according to the first aspect of the patent application, wherein the fuel cell is the DC power source of the patent embodiment, and the patent scope includes a solar cell, DC wind turbines and AC wind turbines are rectified to DC power sources, replacing fuel cells. 25