CN113335065B - Auxiliary power supply system of hydrogen fuel cell - Google Patents

Auxiliary power supply system of hydrogen fuel cell Download PDF

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Publication number
CN113335065B
CN113335065B CN202110784448.7A CN202110784448A CN113335065B CN 113335065 B CN113335065 B CN 113335065B CN 202110784448 A CN202110784448 A CN 202110784448A CN 113335065 B CN113335065 B CN 113335065B
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filter circuit
common
input end
output end
fuel cell
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CN113335065A (en
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石画
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Shenzhen Lande Automotive Power Technology Co ltd
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Shenzhen Lande Automotive Power Technology Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L1/00—Supplying electric power to auxiliary equipment of vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/70—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by fuel cells
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

Abstract

The invention relates to an auxiliary power supply system of a hydrogen fuel cell, wherein the hydrogen fuel cell comprises a hydrogen supply and oxygen supply system, a cooling system, a main controller and a shell ground PE interface. The hydrogen fuel cell auxiliary power supply system comprises a cell auxiliary power supply circuit and an electromagnetic compatibility rectification circuit, wherein the cell auxiliary power supply circuit comprises a non-isolated DC/DC converter, a first isolated DC/DC converter and a second isolated DC/DC converter. The electromagnetic compatibility rectification circuit comprises a first filter circuit connected with a high-voltage lithium battery of the whole vehicle, a second filter circuit connected with a control and communication interface of the whole vehicle, a third filter circuit connected with a hydrogen supply and oxygen supply system of the hydrogen fuel cell, a fourth filter circuit connected with a cooling system of the hydrogen fuel cell and a fifth filter circuit connected with a main controller of the hydrogen fuel cell. The invention can effectively improve the electromagnetic compatibility and the service life of the hydrogen fuel cell, and increase the economical efficiency and the safety and the stability of the hydrogen fuel cell automobile.

Description

Auxiliary power supply system of hydrogen fuel cell
Technical Field
The invention relates to the technical field of new energy, in particular to a hydrogen fuel cell auxiliary power supply system.
Background
The hydrogen fuel cell is a power generation device which directly converts chemical energy of hydrogen and oxygen into electric energy, and generates electricity through electrochemical reaction compared with the traditional mode of adopting combustion (gasoline and diesel oil) or energy storage (storage battery) to generate electricity, and the fuel cell only generates water and heat and has no pollution to the environment; meanwhile, the generating efficiency can reach more than 50%, chemical energy is directly converted into electric energy, intermediate conversion of heat energy and mechanical energy (a generator) is not needed, and the generating efficiency is high.
Due to the characteristics of no noise, no pollution and high power generation efficiency of the hydrogen fuel cell, the hydrogen fuel cell automobile has become an important direction of the technical change of the automobile industry at present, and has become an international research hotspot. China highly attaches importance to the development of the hydrogen fuel cell automobile industry, and the technical research of hydrogen fuel cell automobiles is put into an important scientific and technological plan by continuous five-year planning. At present, the problems that part of key materials and core parts mainly depend on imported or foreign technologies and the like still exist in the development process of hydrogen fuel cell automobiles, and the safe and healthy development of the hydrogen fuel cell industry in China is restricted.
The auxiliary power supply system of the hydrogen fuel cell is a device for supplying power to equipment such as a main controller, a cooling system, a hydrogen supply system and an oxygen supply system in the hydrogen fuel cell, and has important influence on the service life of the hydrogen fuel cell on the power supply performance, the anti-interference performance and the electromagnetic compatibility. The conventional auxiliary power supply system for the hydrogen fuel cell often has the problems of poor electromagnetic compatibility and the like, so that the service life of the hydrogen fuel cell is shortened, and the economical efficiency and the safety stability of a hydrogen fuel cell automobile are even affected.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides an auxiliary power supply system for a hydrogen fuel cell, and solves the problems of poor electromagnetic compatibility, low anti-interference performance and the like of the traditional auxiliary power supply system for the hydrogen fuel cell.
The purpose of the invention is realized by the following technical scheme:
a hydrogen fuel cell auxiliary power supply system and its electromagnetic compatibility rectification circuit, the said hydrogen fuel cell includes supplying hydrogen and oxygen system, cooling system, main control unit and chassis ground PE interface;
the hydrogen fuel cell auxiliary power supply system comprises a cell auxiliary power supply circuit and an electromagnetic compatibility rectification circuit; the battery auxiliary power supply circuit comprises a non-isolated DC/DC converter, a first isolated DC/DC converter and a second isolated DC/DC converter; the electromagnetic compatibility rectification circuit comprises a first filter circuit, a second filter circuit, a third filter circuit, a fourth filter circuit and a fifth filter circuit;
the input end of the first filter circuit is connected with a whole vehicle high-voltage lithium battery, and the output end of the first filter circuit is electrically connected with the voltage input end of the non-isolated DC/DC converter, the voltage input end of the first isolated DC/DC converter and the voltage input end of the second isolated DC/DC converter respectively;
the signal input end of the second filter circuit is connected with the whole vehicle control and communication interface, and the signal output end of the second filter circuit is respectively and electrically connected with the signal input end of the non-isolated DC/DC converter, the signal input end of the first isolated DC/DC converter and the signal input end of the second isolated DC/DC converter;
the voltage output end of the non-isolated DC/DC converter is electrically connected with the input end of a third filter circuit, and the output end of the third filter circuit is connected with a hydrogen supply and oxygen supply system of the hydrogen fuel cell;
the voltage output end of the first isolation type DC/DC converter is electrically connected with the input end of a fourth filter circuit, and the output end of the fourth filter circuit is connected with a hydrogen fuel cell cooling system;
and the voltage output end of the second isolated DC/DC converter is electrically connected with the input end of a fifth filter circuit, and the voltage output end of the fifth filter circuit is connected with a hydrogen fuel cell main controller.
Further, common-mode inductors L1, L2, L3 and L4 are sequentially connected in series between the input end and the output end of the first filter circuit; the input end of the first filter circuit is connected with the common-mode inductor L1 through five parallel capacitors C30 mu, C30 mu, C100n, C10n and C1 n; the common-mode inductors L1 and L2, L2 and L3 and L3 and L4 are connected through three parallel capacitors C100n, C10n and C1n respectively; the common-mode inductor L4 is connected with the output end of the first filter circuit through four parallel capacitors C30 mu, C100n, C10n and C1 n;
the two input interfaces of the input end of the first filter circuit, the two output pins of the common-mode inductors L1, L2 and L3 and the two output interfaces of the output end of the first filter circuit are respectively connected with the ground PE interface of the shell through a capacitor CY.
Further, a diode D1 and common mode inductors L7, L8, L9 and L10 are sequentially connected in series between the voltage input end and the voltage output end of the second filter circuit; two ends of the diode D1 are respectively connected with an inductor LC and are connected with a common mode inductor L7 through three parallel capacitors C100n, C10n and C1 n; the common-mode inductors L7 and L8, L8 and L9 and L9 and L10 are respectively connected through three parallel capacitors C10n, C1n and C100 p; the common-mode inductor L10 is connected with the voltage output end of the second filter circuit through three parallel capacitors C100n, C10n and C1 n;
a diode D2 and common mode inductors L13, L14, L15 and L16 are sequentially connected in series between the signal input end and the signal output end of the second filter circuit; two ends of the diode D2 are respectively connected with an inductor LC and are connected with a common mode inductor L13 through 3 parallel capacitors C100n, C10n and C1 n; the common-mode inductors L13 and L14, L14 and L15 and L15 and L16 are connected through three parallel capacitors C10n, C1n and C100p respectively; the common-mode inductor L16 is connected with the signal output end of the second filter circuit through three parallel capacitors C100n, C10n and C1 n;
the two output pins of the common-mode inductors L7, L8, L9, L13, L14 and L15 are respectively connected with the chassis ground PE through a capacitor CY;
common-mode inductors L17 and L18 are sequentially connected in series between the data input end and the data output end of the second filter circuit; the data input end of the second filter circuit is connected with the common-mode inductor L17, and the data output end of the common-mode inductor L18 is connected with the data output end of the second filter circuit through three parallel capacitors C100n, C10n and C1 n.
Further, common-mode inductors L19, L20, L21 and L22 are sequentially connected in series between the input end and the output end of the third filter circuit; the input end of the third filter circuit is connected with a common-mode inductor L19 through five parallel capacitors C30 mu, C30 mu, C100n, C10n and C1n, and the common-mode inductors L19 and L20, L20 and L21 and L21 and L22 are respectively connected through three parallel capacitors C100n, C10n and C1 n; the common-mode inductor L22 is connected with the output end of the third filter circuit through four parallel capacitors C30 mu, C100n, C10n and C1 n; the two input interfaces of the input end of the third filter circuit, the two output pins of the common-mode inductors L19, L20 and L21 and the two output interfaces of the output end of the third filter circuit are respectively connected with the chassis ground PE through a capacitor CY.
Further, common-mode inductors L23, L24, L25 and L26 are connected in series between the input end and the output end of the fourth filter circuit in sequence; the input end of the fourth filter circuit is connected with the common-mode inductor L23 through five parallel capacitors C110 mu, C20 mu, C100n, C10n and C1 n; the common-mode inductor L26 is connected with the output end of the fourth filter circuit through four parallel capacitors C20 mu, C100n, C10n and C1 n; and the two input interfaces at the input end of the fourth filter circuit and the two output interfaces at the output end of the fourth filter circuit are respectively connected with the ground PE of the shell through two capacitors CY connected in parallel.
Further, common-mode inductors L27 and L28 are sequentially connected in series between the input end and the output end of the fifth filter circuit, the input end of the fifth filter circuit is connected with the common-mode inductor L27 through five parallel capacitors C110 μ, C20 μ, C100n, C10n and C1n, and the common-mode inductor L28 is connected with the output end of the fifth filter circuit through three parallel capacitors C100n, C10n and C1 n; and the two input interfaces at the input end of the fifth filter circuit and the two output interfaces at the output end of the fifth filter circuit are respectively connected with the casing ground PE through two capacitors CY connected in parallel.
Further, the capacitance C110 μ -110 μ F, C30 μ -30 μ F, C20 μ -20 μ F, C100-100 n, C10 n-10 nF, C1 n-1 nF, and C100 p-100 pF are farad capacitances, and the capacitance CY-10 nF is a Y capacitance.
Further, the common mode inductors L1, L2, L7, L8, L13, L14, L17, L19 and L20 are nickel-zinc magnetic ring common mode inductors, L1 ═ L2 ═ L17 ═ L19 ═ L20 ═ 30 μ H, and L7 ═ L8 ═ L13 ═ L14 ═ 70 μ H.
Further, the common-mode inductors L3, L4, L9, L10, L15, L16, L18, L21, L22, L23, L24, L25, L26, L27, and L28 are amorphous magnetic ring common-mode inductors; l3 ═ L4 ═ L21 ═ L22 ═ 2300 μ H, L9 ═ L10 ═ L15 ═ L16 ═ L18 ═ 3500 μ H, L23 ═ L24 ═ L25 ═ L26 ═ L27 ═ L28 ═ 70 μ H.
Further, the inductor LC-12 μ H is a differential mode inductor, and the diodes D1 and D2 are transient voltage suppression diodes SM8S 33A.
The invention has the beneficial effects that: by combining the battery auxiliary power supply circuit with the electromagnetic compatibility rectification circuit, the problems of poor electromagnetic compatibility and the like of a hydrogen fuel battery auxiliary power supply system are effectively solved, the service life of the hydrogen fuel battery is prolonged, and the economical efficiency and the safety and the stability of a hydrogen fuel battery automobile are improved; meanwhile, the electromagnetic compatibility of the hydrogen fuel cell auxiliary power supply system is effectively improved under the condition of not changing an internal printed circuit board, so that the electromagnetic compatibility reaches the GB18655 CLASS 3 standard and is more than the GB 3 standard, and the electromagnetic compatibility design optimization time of the hydrogen fuel cell auxiliary system is greatly shortened by at least one month.
Drawings
FIG. 1 is a schematic diagram of the auxiliary power supply system of the hydrogen fuel cell of the present invention
Fig. 2 is a first filter circuit diagram of the emc correction circuit of the present invention.
Fig. 3 is a second filter circuit diagram of the emc correction circuit of the present invention.
Fig. 4 is a third filter circuit diagram of the emc correction circuit of the present invention.
Fig. 5 is a fourth filter circuit diagram of the emc rectifying circuit of the present invention.
Fig. 6 is a fifth filter circuit diagram of the emc correction circuit of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
The first embodiment is as follows:
as shown in fig. 1, the present invention provides an auxiliary power supply system for a hydrogen fuel cell, wherein the hydrogen fuel cell comprises a hydrogen and oxygen supply system, a cooling system, a main controller and a PE interface of a housing.
The hydrogen fuel cell auxiliary power supply system comprises a cell auxiliary power supply circuit and an electromagnetic compatibility rectification circuit; the battery auxiliary power supply circuit comprises a non-isolated DC/DC converter, a first isolated DC/DC converter and a second isolated DC/DC converter; the electromagnetic compatibility rectification and modification circuit comprises a first filter circuit, a second filter circuit, a third filter circuit, a fourth filter circuit and a fifth filter circuit.
The input end of the first filter circuit is connected with a whole vehicle high-voltage lithium battery, ripples in the output voltage of the whole vehicle high-voltage lithium battery are filtered, and radiation and noise are generated by the level of conducted interference and the fast transient state of the filtered voltage and current. The output end of the first filter circuit is electrically connected with the voltage input end of the non-isolated DC/DC converter, the voltage input end of the first isolated DC/DC converter and the voltage input end of the second isolated DC/DC converter respectively. The first filter circuit is responsible for transmitting the voltage of 450-750V voltage of a finished automobile high-voltage lithium battery to a voltage input end of a non-isolated DC/DC converter after voltage filtering, and the voltage input end of the first isolated DC/DC converter and the voltage input end of a second isolated DC/DC converter.
The signal input end of the second filter circuit is connected with the whole vehicle control and communication interface, and is responsible for transmission of a whole vehicle control signal and a communication signal, and noise and interference signals generated by the whole vehicle control and communication interface can be filtered. The output end of the second filter circuit is electrically connected with the signal input end of the non-isolated DC/DC converter, the signal input end of the first isolated DC/DC converter and the signal input end of the second isolated DC/DC converter respectively;
and the voltage output end of the non-isolated DC/DC converter is electrically connected with the input end of the third filter circuit, and is responsible for directly converting the obtained voltage signal into 300V voltage without isolation and transmitting the voltage signal to the voltage input end of the third filter circuit. The output end of the third filter circuit is connected with a hydrogen supply and oxygen supply system of the hydrogen fuel cell, and the output voltage of the whole high-voltage lithium battery is subjected to voltage conversion through a non-isolated DC/DC converter, so that the voltage is stabilized, the power density is high, the conversion efficiency is high, and the energy utilization rate is convenient to improve; meanwhile, the device has the characteristics of good dynamic adjustment capability, small volume, light weight and high boosting ratio; the third filter circuit can remove radiation and noise generated in the voltage transmission.
The voltage output end of the first isolation type DC/DC converter is electrically connected with the input end of the fourth filter circuit, and the output end of the fourth filter circuit is connected with the hydrogen fuel cell cooling system. The first isolation type DC/DC converter filters the obtained 24V voltage signal to obtain 24V stable voltage, and transmits the 24V stable voltage to the hydrogen fuel cell cooling system, so that the hydrogen fuel cell cooling system and the finished automobile high-voltage lithium battery are independent and do not influence each other, the fuel cell and the finished automobile high-voltage lithium battery are protected, and the voltage gain is improved; the fourth filter circuit can remove radiation, noise and interference generated in voltage transmission.
The voltage output end of the second isolated DC/DC converter is electrically connected with the input end of a fifth filter circuit, and the voltage output end of the fifth filter circuit is connected with the hydrogen fuel cell main controller. The second isolation type DC/DC converter obtains 12V stable voltage after filtering the obtained 12V voltage signal, and transmits the 12V stable voltage to the hydrogen fuel cell main controller. The fifth filter circuit filters radiation, noise and interference generated in the voltage transmission.
The second embodiment:
as shown in fig. 2 and 3, in the emc rectifying circuit according to the first embodiment, farad capacitors are preferably used as the capacitors C110 μ, C30 μ, C20 μ, C100n, C10n, C1n, and C100p, and capacitors C110 μ -F, C30 μ -30 μ -F, C20 μ -20 μ -F, C100 n-100 nF, C10 n-10 nF, C1 n-1 nF, and C100 p-100 pF. The capacitor CY is preferably a Y capacitor, and each of the capacitors CY1 to CY48 is a Y capacitor CY of 10 nF.
Inductors L1, L2, L7, L8, L13, L14, L17, L19, and L20 are preferably nickel-zinc magnetic ring common mode inductors. L1 ═ L2 ═ L17 ═ L19 ═ L20 ═ 30 μ H, L7 ═ L8 ═ L13 ═ L14 ═ 70 μ H.
Inductors L3, L4, L9, L10, L15, L16, L18, L21, L22, L23, L24, L25, L26, L27, and L28 are preferably amorphous magnetic ring common mode inductors. L3 ═ L4 ═ L21 ═ L22 ═ 2300 μ H; l9 ═ L10 ═ L15 ═ L16 ═ L18 ═ 3500 μ H; l23 ═ L24 ═ L25 ═ L26 ═ L27 ═ L28 ═ 70 μ H.
The inductance LC is preferably differential mode inductance, L5, L6, L11 and L12 are LC ═ 12 μ H, and the diodes D1 and D2 are preferably transient voltage suppression diodes SM8S 33A.
Preferably, a common mode inductor L1-30 μ H, L2-30 μ H, L3-2300 μ H, L4-2300 μ H is connected in series between the input end and the output end of the first filter circuit in sequence. The input end of the first filter circuit is connected to the common-mode inductor L1 via five parallel capacitors C30 μ -30 μ F, C30 μ -30 μ -F, C100-100 n-100 nF, C10 n-10 nF, and C1 n-1 nF. The common mode inductors L1 and L2, L2 and L3, and L3 and L4 are connected by three parallel capacitors C100 n-100 nF, C10 n-10 nF, and C1 n-1 nF, respectively. The common mode inductor L4 is connected to the output of the first filter circuit via four parallel capacitors C30 μ F, C100n — 100nF, C10n — 10nF, and C1n — 1 nF. The two input interfaces of the input end of the first filter circuit, the two output pins of the common-mode inductors L1, L2 and L3 and the two output interfaces of the output end of the first filter circuit are respectively connected with the interface of the chassis ground PE through a Y capacitor CY-10 nF.
Preferably, a diode D1 and a common mode inductor L7 ═ 70 μ H, L8 ═ 70 μ H, L9 ═ 3500 μ H, L10 ═ 3500 μ H are sequentially connected in series between the voltage input terminal and the voltage output terminal of the second filter circuit. Two ends of the diode D1 are connected with a 12 μ H differential mode inductor LC, and are connected with a common mode inductor L7 through three parallel capacitors C100n — 100nF, C10n — 10nF, and C1n — 1 nF. The common mode inductors L7 and L8, L8 and L9, and L9 and L10 are connected by three parallel capacitors C10 n-10 nF, C1 n-1 nF, and C100 p-100 pF, respectively. The common mode inductor L10 is connected to the second filter circuit voltage output terminal via three parallel capacitors C100 n-100 nF, C10 n-10 nF, and C1 n-1 nF.
A diode D2 and a common mode inductor L13-70 mu H, L14-3500 mu H, L15-3500 mu H, L16-3500 mu H are sequentially connected in series between the signal input end and the signal output end of the second filter circuit. Two ends of the diode D2 are respectively connected with a 12 μ H differential mode inductor LC, and are connected with a common mode inductor L13 through 3 parallel capacitors C100n ═ 100nF, C10n ═ 10nF and C1n ═ 1 nF; the common mode inductors L13 and L14, L14 and L15, and L15 and L16 are connected by three parallel capacitors C10 n-10 nF, C1 n-1 nF, and C100 p-100 pF, respectively. The common mode inductor L16 is connected to the signal output terminal of the second filter circuit through three parallel capacitors C100 n-100 nF, C10 n-10 nF, and C1 n-1 nF. Two output pins of the common mode inductors L7, L8, L9, L13, L14, and L15 are connected to the chassis ground PE through one Y capacitor CY equal to 10 nF.
A common-mode inductor L17 ═ 30 μ H, L18 ═ 3500 μ H is sequentially connected in series between the data input end and the data output end of the second filter circuit; the data input end of the second filter circuit is connected with the common-mode inductor L17, and the data output end of the second filter circuit is connected with the common-mode inductor L18 through three parallel capacitors C100 n-100 nF, C10 n-10 nF and C1 n-1 nF, respectively.
According to the preferable technical scheme, the third filter circuit provides stable 300V voltage for a hydrogen supply and oxygen supply system of the hydrogen fuel cell. Common-mode inductance L19-30 mu H, L20-30 mu H, L21-2300 mu H, L22-2300 mu H is sequentially connected in series between the input end and the output end of the third filter circuit. The input end of the third filter circuit is connected with the common-mode inductor L19 through five parallel capacitors C30 μ -30 μ F, C30 μ -30 μ -F, C100-100 n-100 nF, C10 n-10 nF and C1 n-1 nF, and the common-mode inductors L19 and L20, L20 and L21 and L21 and L22 are connected through three parallel capacitors C100 n-100 nF, C10 n-10 nF and C1 n-1 nF, respectively. The common mode inductor L22 is connected to the third filter circuit output terminal via four parallel capacitors C30 μ F, C100n — 100nF, C10n — 10nF, and C1n — 1 nF. The two input interfaces of the input end of the third filter circuit, the two output pins of the common-mode inductors L19, L20 and L21 and the two output interfaces of the output end of the third filter circuit are respectively connected with the chassis ground PE through one Y capacitor CY-10 nF.
According to the preferable technical scheme, the fourth filter circuit filters the obtained 24V voltage signal and provides stable 24V voltage for the hydrogen fuel cell cooling system. The common-mode inductor L23, 70 μ H, L24, 70 μ H, L25, 70 μ H, L26, 70 μ H is connected in series between the input end and the output end of the fourth filter circuit in sequence. The input end of the fourth filter circuit is connected to the common-mode inductor L23 via five parallel capacitors C110 μ -F, C20 μ -20 μ F, C100-100 n-100 nF, C10 n-10 nF, and C1 n-1 nF. The common mode inductor L26 is connected to the fourth filter circuit output terminal via four parallel capacitors C20 μ F, C100n — 100nF, C10n — 10nF, and C1n — 1 nF. Two input interfaces of the input end of the fourth filter circuit and two output interfaces of the output end of the fourth filter circuit are respectively connected with the chassis ground PE through two Y capacitors CY-10 nF connected in parallel.
According to the preferable technical scheme, the fifth filter circuit filters the obtained 12V voltage signal to provide stable 12V voltage for the hydrogen fuel cell main controller. Common mode inductance L27 ═ 70 μ H and L28 ═ 70 μ H are sequentially connected in series between the input end and the output end of the fifth filter circuit, the input end of the fifth filter circuit is connected with common mode inductance L27 through five parallel capacitors C110 μ ═ 110 μ F, C20 μ ═ 20 μ F, C100n ═ 100nF, C10n ═ 10nF and C1n ═ 1nF, and the common mode inductance L28 is connected with the output end of the fifth filter circuit through three parallel capacitors C100n ═ 100nF, C10n ═ 10nF and C1n ═ 1 nF. Two input interfaces of an input end of the fifth filter circuit and two output interfaces of an output end of the fifth filter circuit are respectively connected with the chassis ground PE through two Y capacitors CY-10 nF connected in parallel.
According to the invention, the electromagnetic compatibility rectifying circuit formed by the first filter circuit, the second filter circuit, the third filter circuit, the fourth filter circuit and the fifth filter circuit eliminates signal interference, electromagnetic interference, noise interference and radiation interference generated when the hydrogen fuel cell auxiliary power supply system works, effectively improves the electromagnetic compatibility of the hydrogen fuel cell auxiliary power supply system, prolongs the service life of the hydrogen fuel cell, and improves the economic efficiency and the safety stability of a hydrogen fuel cell automobile.
It should be understood that the above-described embodiments are merely preferred examples of the present invention and the technical principles applied thereto, and any changes, modifications, substitutions, combinations and simplifications made by those skilled in the art without departing from the spirit and principle of the present invention shall be covered by the protection scope of the present invention.

Claims (10)

1. A hydrogen fuel cell auxiliary power supply system comprises a hydrogen supply and oxygen supply system, a cooling system, a main controller and a shell ground PE interface; the method is characterized in that:
the hydrogen fuel cell auxiliary power supply system comprises a cell auxiliary power supply circuit and an electromagnetic compatibility rectification circuit; the battery auxiliary power supply circuit comprises a non-isolated DC/DC converter, a first isolated DC/DC converter and a second isolated DC/DC converter; the electromagnetic compatibility rectification circuit comprises a first filter circuit, a second filter circuit, a third filter circuit, a fourth filter circuit and a fifth filter circuit;
the input end of the first filter circuit is connected with a whole vehicle high-voltage lithium battery, and the output end of the first filter circuit is electrically connected with the voltage input end of the non-isolated DC/DC converter, the voltage input end of the first isolated DC/DC converter and the voltage input end of the second isolated DC/DC converter respectively;
the signal input end of the second filter circuit is connected with the whole vehicle control and communication interface, and the signal output end of the second filter circuit is electrically connected with the signal input end of the non-isolated DC/DC converter, the signal input end of the first isolated DC/DC converter and the signal input end of the second isolated DC/DC converter respectively;
the voltage output end of the non-isolated DC/DC converter is electrically connected with the input end of a third filter circuit, and the output end of the third filter circuit is connected with a hydrogen supply and oxygen supply system of the hydrogen fuel cell;
the voltage output end of the first isolation type DC/DC converter is electrically connected with the input end of a fourth filter circuit, and the output end of the fourth filter circuit is connected with a hydrogen fuel cell cooling system;
the voltage output end of the second isolation type DC/DC converter is electrically connected with the input end of a fifth filter circuit, and the voltage output end of the fifth filter circuit is connected with a hydrogen fuel cell main controller.
2. A hydrogen fuel cell auxiliary power supply system according to claim 1, characterized in that: common-mode inductors L1, L2, L3 and L4 are sequentially connected in series between the input end and the output end of the first filter circuit; the input end of the first filter circuit is connected with the common-mode inductor L1 through five parallel capacitors C30 mu, C30 mu, C100n, C10n and C1 n; the common-mode inductors L1 and L2, L2 and L3 and L3 and L4 are respectively connected through three parallel capacitors C100n, C10n and C1 n; the common-mode inductor L4 is connected with the output end of the first filter circuit through four parallel capacitors C30 mu, C100n, C10n and C1 n;
the two input interfaces of the input end of the first filter circuit, the two output pins of the common-mode inductors L1, L2 and L3 and the two output interfaces of the output end of the first filter circuit are respectively connected with the ground PE interface of the shell through a capacitor CY.
3. A hydrogen fuel cell auxiliary power supply system according to claim 2, characterized in that: a diode D1 and common mode inductors L7, L8, L9 and L10 are sequentially connected in series between the voltage input end and the voltage output end of the second filter circuit; two ends of the diode D1 are respectively connected with an inductor LC and are connected with a common mode inductor L7 through three parallel capacitors C100n, C10n and C1 n; the common-mode inductors L7 and L8, L8 and L9 and L9 and L10 are respectively connected through three parallel capacitors C10n, C1n and C100 p; the common-mode inductor L10 is connected with the voltage output end of the second filter circuit through three parallel capacitors C100n, C10n and C1 n;
a diode D2 and common mode inductors L13, L14, L15 and L16 are sequentially connected in series between the signal input end and the signal output end of the second filter circuit; two ends of the diode D2 are respectively connected with an inductor LC and are connected with a common mode inductor L13 through 3 parallel capacitors C100n, C10n and C1 n; the common-mode inductors L13 and L14, L14 and L15 and L15 and L16 are respectively connected through three parallel capacitors C10n, C1n and C100 p; the common-mode inductor L16 is connected with the signal output end of the second filter circuit through three parallel capacitors C100n, C10n and C1 n;
two output pins of the common mode inductors L7, L8, L9, L13, L14 and L15 are respectively connected with the chassis ground PE through a capacitor CY;
common-mode inductors L17 and L18 are sequentially connected in series between the data input end and the data output end of the second filter circuit; the data input end of the second filter circuit is connected with the common-mode inductor L17, and the data output end of the common-mode inductor L18 is connected with the data output end of the second filter circuit through three parallel capacitors C100n, C10n and C1n respectively.
4. A hydrogen fuel cell auxiliary power supply system in accordance with claim 3, wherein: common-mode inductors L19, L20, L21 and L22 are sequentially connected in series between the input end and the output end of the third filter circuit; the input end of the third filter circuit is connected with a common-mode inductor L19 through five parallel capacitors C30 mu, C30 mu, C100n, C10n and C1n, and the common-mode inductors L19 and L20, L20 and L21 and L21 and L22 are respectively connected through three parallel capacitors C100n, C10n and C1 n; the common-mode inductor L22 is connected with the output end of the third filter circuit through four parallel capacitors C30 mu, C100n, C10n and C1 n; the two input interfaces of the input end of the third filter circuit, the two output pins of the common-mode inductors L19, L20 and L21 and the two output interfaces of the output end of the third filter circuit are respectively connected with the chassis ground PE through a capacitor CY.
5. A hydrogen fuel cell auxiliary power supply system according to claim 4, characterized in that: common-mode inductors L23, L24, L25 and L26 are sequentially connected in series between the input end and the output end of the fourth filter circuit; the input end of the fourth filter circuit is connected with the common-mode inductor L23 through five parallel capacitors C110 mu, C20 mu, C100n, C10n and C1 n; the common-mode inductor L26 is connected with the output end of the fourth filter circuit through four parallel capacitors C20 mu, C100n, C10n and C1 n; and the two input interfaces at the input end of the fourth filter circuit and the two output interfaces at the output end of the fourth filter circuit are respectively connected with the ground PE of the shell through two capacitors CY connected in parallel.
6. A hydrogen fuel cell auxiliary power supply system according to claim 5, characterized in that: common-mode inductors L27 and L28 are sequentially connected in series between the input end and the output end of the fifth filter circuit, the input end of the fifth filter circuit is connected with the common-mode inductor L27 through five parallel capacitors C110 mu, C20 mu, C100n, C10n and C1n, and the common-mode inductor L28 is connected with the output end of the fifth filter circuit through three parallel capacitors C100n, C10n and C1 n; and the two input interfaces at the input end of the fifth filter circuit and the two output interfaces at the output end of the fifth filter circuit are respectively connected with the casing ground PE through two capacitors CY connected in parallel.
7. A hydrogen fuel cell auxiliary power supply system according to claim 6, characterized in that: the capacitance C110 μ -110 μ F, C30 μ -30 μ F, C20 μ -20 μ F, C100 n-100 nF, C10 n-10 nF, C1 n-1 nF, and C100 p-100 pF are farad capacitances, and the capacitance CY-10 nF is a Y capacitance.
8. A hydrogen fuel cell auxiliary power supply system in accordance with claim 6, wherein: the common-mode inductors L1, L2, L7, L8, L13, L14, L17, L19 and L20 are nickel-zinc magnetic ring common-mode inductors, L1 ═ L2 ═ L17 ═ L19 ═ L20 ═ 30 μ H, and L7 ═ L8 ═ L13 ═ L14 ═ 70 μ H.
9. A hydrogen fuel cell auxiliary power supply system according to claim 6, characterized in that: the common-mode inductors L3, L4, L9, L10, L15, L16, L18, L21, L22, L23, L24, L25, L26, L27 and L28 are amorphous magnetic ring common-mode inductors; l3 ═ L4 ═ L21 ═ L22 ═ 2300 μ H, L9 ═ L10 ═ L15 ═ L16 ═ L18 ═ 3500 μ H, L23 ═ L24 ═ L25 ═ L26 ═ L27 ═ L28 ═ 70 μ H.
10. A hydrogen fuel cell auxiliary power supply system according to claim 6, characterized in that: the inductor LC-12 μ H is a differential mode inductor, and the diodes D1 and D2 are transient voltage suppression diodes SM8S 33A.
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US20050141248A1 (en) * 2003-09-11 2005-06-30 Mazumder Sudip K. Novel efficient and reliable DC/AC converter for fuel cell power conditioning
JP6855902B2 (en) * 2017-04-24 2021-04-07 トヨタ自動車株式会社 Fuel cell system
CN110385995A (en) * 2019-07-30 2019-10-29 深圳市英威腾电气股份有限公司 A kind of control circuit and control method of Hydrogen Fuel-cell Vehicles dcdc converter
CN111082100A (en) * 2019-12-31 2020-04-28 上海杰宁新能源科技发展有限公司 Hydrogen fuel cell control system
CN112224049B (en) * 2020-12-11 2021-03-09 北京理工大学深圳汽车研究院(电动车辆国家工程实验室深圳研究院) DC/DC conversion device and filtering method for hydrogen fuel cell power system

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