CN219737710U - Electronic load circuit and equipment for fuel cell test - Google Patents
Electronic load circuit and equipment for fuel cell test Download PDFInfo
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- CN219737710U CN219737710U CN202320867833.2U CN202320867833U CN219737710U CN 219737710 U CN219737710 U CN 219737710U CN 202320867833 U CN202320867833 U CN 202320867833U CN 219737710 U CN219737710 U CN 219737710U
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- 238000012360 testing method Methods 0.000 title claims abstract description 72
- 239000000446 fuel Substances 0.000 title claims abstract description 56
- 238000002955 isolation Methods 0.000 claims abstract description 23
- 238000004891 communication Methods 0.000 claims abstract description 8
- 238000009413 insulation Methods 0.000 claims abstract description 8
- 238000001514 detection method Methods 0.000 claims abstract description 7
- 230000002457 bidirectional effect Effects 0.000 claims description 23
- 230000001012 protector Effects 0.000 claims description 13
- 238000010586 diagram Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
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- 238000003745 diagnosis Methods 0.000 description 1
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Abstract
The utility model relates to an electronic load circuit and equipment for testing a fuel cell, which relate to the technical field of fuel cells and comprise the following components: alternating current interface, alternating current relay, isolation transformer, two-way DC-DC converter, two-way DC/DC converter, direct current filter 1, shunt, direct current relay 1, electronic load passageway, impedance test module, impedance test passageway, insulation detection module, DC/DC converter, direct current filter 2, direct current relay 2, high voltage power supply passageway, isolation DC/DC converter, direct current relay 3, low voltage power supply passageway, main control module, communication interface, well accuse screen.
Description
Technical Field
The present utility model relates to the technical field of fuel cells, and in particular, to an electronic load circuit and an electronic load device for testing a fuel cell.
Background
With the rapid development of the fuel cell industry, the requirements for fuel cell testing are continuously increasing, and load equipment for fuel cell testing is also continuously and iteratively upgraded.
This process, from resistive load to power consuming electronic load to feedback electronic load, is rapidly evolving but is difficult to fully meet today's fuel cell tester needs. For performance testing of fuel cell systems, a tester typically needs to use multiple electrical devices simultaneously, including a dc electronic load, a high voltage dc power supply, a low voltage dc power supply, and an impedance tester.
At present, the electronic load for fuel cell test can be used as an electronic load or a two-way constant voltage source, has a single function, and cannot meet the multifunctional requirements of users on test equipment. The user needs to additionally prepare a high-voltage direct-current power supply, a low-voltage direct-current power supply and an impedance tester for fuel cell testing, and the fuel cell testing device is inconvenient to use and low in working efficiency. Multiple devices are used simultaneously, occupy on-site test resources, are unfavorable for device maintenance, and increase purchase cost.
Disclosure of Invention
In order to at least partially solve the technical problems, the utility model provides an electronic load circuit and equipment for testing a fuel cell.
The electronic load circuit for testing the fuel cell adopts the following technical scheme.
A fuel cell test electronic load circuit comprising:
alternating current interface, alternating current relay, isolation transformer, two-way inverter, two-way DC/DC converter, direct current filter 1, shunt, direct current relay 1, electronic load channel, impedance test module, impedance test channel, insulation detection module, DC/DC converter, direct current filter 2, direct current relay 2, high voltage power supply channel, isolation DC/DC converter, direct current relay 3, low voltage power supply channel, main control module;
one end of the alternating current relay is connected with the alternating current interface, and the other end of the alternating current relay is connected with the isolation transformer;
one end of the bidirectional inverter is connected with the isolation transformer, and the other end of the bidirectional inverter is respectively connected with the bidirectional DC/DC converter, the DC/DC converter and the isolation DC/DC converter;
one end of the direct current filter 1 is connected with the bidirectional DC/DC converter, and the other end is connected with the shunt and the negative electrode of the input side of the direct current relay 1;
the shunt is connected in series between the anode of the direct current filter 1 and the anode of the input side of the direct current relay 1;
the direct current relay 1 is connected with the electronic load channel;
one end of the impedance testing module is connected with the shunt and the high-voltage circuit on the input side of the direct-current relay 1, and the other end of the impedance testing module is connected with the impedance testing channel;
the insulation detection module is connected with the high-voltage circuit at the input side of the direct-current relay 1;
one end of the direct current filter 2 is connected with the DC/DC converter, and the other end of the direct current filter is connected with the direct current relay 2;
the direct current relay 2 is connected with a high-voltage power supply channel;
one end of the direct current relay 3 is connected with the isolated DC/DC converter, and the other end is connected with the low-voltage power supply channel.
Optionally, the electronic load circuit further comprises a central control screen and a communication interface; the main control module is connected with the central control screen and the communication interface.
Optionally, the electronic load circuit channels are provided with 4 channels.
Optionally, the electronic load circuit further comprises a leakage protector; the alternating current interface is connected with the leakage protector; the alternating current relay is connected with the leakage protector.
The utility model also provides an electronic load device for testing the fuel cell, which comprises: a body and any one of the above fuel cell test electronic load circuits; the electronic load circuit is arranged in the machine body.
Drawings
Fig. 1 is a circuit diagram of an electronic load for fuel cell testing in accordance with an embodiment of the present utility model.
Fig. 2 is a schematic diagram of a fuel cell system test connection according to an embodiment of the present utility model.
Fig. 3 is a schematic diagram of a fuel cell stack test connection according to an embodiment of the present utility model.
Detailed Description
The utility model is further illustrated by the following description of the embodiments in conjunction with the accompanying figures 1-3:
first, what needs to be described here is: in the description of the present utility model, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like are used for convenience of description only as regards orientation or positional relationship as shown in the accompanying drawings, and do not denote or imply that the apparatus or element in question must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model; moreover, the numerical terms such as the terms "first," "second," "third," etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" should be construed broadly, and may be, for example, a fixed connection, a releasable connection, an interference fit, a transition fit, or an integral connection; can be directly connected or indirectly connected through an intermediate medium; the specific meaning of the above terms in the present utility model will be understood by those skilled in the art according to the specific circumstances.
The embodiment of the utility model discloses an electronic load circuit for testing a fuel cell. Referring to fig. 1-3, as one embodiment of an electronic load circuit for a fuel cell test, a fuel cell test electronic load circuit includes: alternating current interface, earth leakage protector, alternating current relay, isolation transformer, two-way DC-DC converter, two-way DC/DC converter, direct current filter 1, shunt, direct current relay 1, electronic load passageway, impedance test module, impedance test passageway, insulation detection module, DC/DC converter, direct current filter 2, direct current relay 2, high voltage power supply passageway, isolation DC/DC converter, direct current relay 3, low voltage power supply passageway, main control module, communication interface, well accuse screen.
The alternating current interface, the leakage protector, the alternating current relay, the isolation transformer and the bidirectional inverter are multiplexing power modules of an electronic load channel, a high-voltage power channel and a low-voltage power channel.
As the central controller of the electronic load circuit, the main control module can control each module in the electronic load circuit to work according to a preset program, and meanwhile, the electronic load circuit has the functions of signal acquisition, information interaction, fault diagnosis and the like. The main control module ensures high reliability and efficiency of the system and provides reliable support for smooth test work.
The main control module is connected with the central control screen and the communication interface, and can perform local operation through the central control screen, so that visual reading and writing of relevant parameters of the electronic load are realized. In addition, the module CAN also support CAN communication type, and realizes remote operation and information interaction by being connected with an upper computer.
The alternating current interface is connected with the leakage protector, and the 380V alternating current power grid is used for carrying out electric energy transmission with the leakage protector through the alternating current interface. The alternating current interface is an interface for connecting the electronic load with an external power grid. The leakage protector connected with the alternating current interface can effectively prevent overload, short circuit and leakage of the electronic load, ensure stable operation of the electronic load, ensure human safety and avoid accidental electric shock accidents. The leakage protector not only can realize effective protection of an electronic load system, but also can effectively manage potential personal safety hazards possibly existing in a test environment, and has important safety guarantee significance.
One end of the alternating current relay is connected with the leakage protector, and the other end of the alternating current relay is connected with the isolation transformer. The alternating current relay is an important component part in the electronic load and mainly plays a role in controlling the conduction and disconnection of alternating current. The connection and disconnection of the electronic load and an external power grid can be accurately controlled through the alternating current relay, so that the electronic load is accurately controlled. Meanwhile, the isolation transformer is used as an electrical isolation device, so that the alternating voltage is converted, the power grid and the bidirectional inverter can be electrically isolated, and the safety of an electrical system is improved. In addition, the isolation transformer can effectively reduce the influence on the power grid when the electronic load feeds back energy, and ensure the electric energy quality during feedback.
One end of the bidirectional inverter is connected with the isolation transformer, and the other end of the bidirectional inverter is respectively connected with the bidirectional DC/DC converter, the DC/DC converter and the isolation DC/DC converter. The bidirectional inverter adopts synchronous PWM rectification technology to realize AC-DC and DC-AC voltage conversion and simultaneously meet the requirement of energy bidirectional flow. The bidirectional DC/DC converter adopts a multi-path staggered BUCK BUCK chopper circuit topology, and can realize a voltage conversion function and bidirectional energy flow. The DC/DC converter mainly aims to realize adjustable high-voltage power output, and simultaneously has two implementation modes in order to match motor load and meet the requirement that energy generated during motor braking feedback is discharged in a path. In the first implementation mode, a DC/DC converter adopts a bidirectional buck main topology circuit, and energy generated by motor braking feedback is transmitted to a power grid; in a second implementation mode, the DC/DC converter selects a unidirectional buck main topology circuit, a power resistor bleeder circuit is added, and energy generated by motor braking feedback can be consumed by a power resistor. The isolation DC/DC converter is of a unidirectional buck type, so that adjustable low-voltage power output is realized, and electrical isolation between low-voltage power at an output end and high-voltage power at an input end is ensured.
One end of the direct current filter 1 is connected with the bidirectional DC/DC converter, and the other end is connected with the shunt and the negative electrode of the input side of the direct current relay 1. The direct current filter 1 is one of filters used for filtering out the output ripple signals of the direct current power supply in the electronic load circuit, and the main function of the direct current filter is to ensure that the output voltage of the bidirectional DC/DC converter has good ripple characteristics and stability. Excessive voltage fluctuation and ripple can interfere the working effect of the electronic load and the accuracy of the test result, and the direct current filter 1 can effectively filter the direct current power supply ripple signals, so that the voltage output by the bidirectional DC/DC converter becomes more stable, stable and reliable, thereby ensuring the high-precision test work of the electronic load.
The shunt is connected in series between the positive pole of the DC filter 1 and the positive pole of the input side of the DC relay 1. In an electronic load, the shunt is mainly used for collecting the disturbance current value flowing through the loop. .
The dc relay 1 is also connected to an electronic load path. The direct current relay 1 is used for controlling the on and off of an electronic load channel. By controlling the electromagnetic on-off of the direct current relay 1, the on-off of the electronic load channel can be accurately controlled, thereby realizing the effective control of the electronic load.
One end of the impedance testing module is connected with the shunt and the high-voltage circuit on the input side of the direct-current relay 1, and the other end of the impedance testing module is connected with the impedance testing channel. The impedance test module has two operating states. When one impedance test channel is in an external disturbance mode, an alternating current disturbance mode is adopted by a bidirectional DC/DC converter, and an impedance test module calculates an alternating current impedance value of a tested object connected with a test circuit channel by collecting a disturbance current component i1 of a shunt and a voltage U1 at the input side of a direct current relay 1; and secondly, when the impedance test channel is in a self-disturbance mode, after the impedance test channel is connected with the measured object through an external circuit, a disturbance circuit arranged in the impedance test module actively applies alternating current disturbance to the measured object, measures disturbance current and voltage of the measured object, and calculates an alternating current impedance value.
The insulation detection module is connected with a high-voltage circuit on the input side of the direct-current relay 1, and judges whether the system has potential electrical safety hazards or not by monitoring the insulation resistance value of the system in real time.
One end of the direct current filter 2 is connected with the DC/DC converter, and the other end is connected with the direct current relay 2. The DC filter 2 functions to ensure good ripple characteristics of the DC/DC converter output voltage.
The dc relay 2 is also connected to the high voltage power supply channel. The direct current relay 2 is used for controlling the on and off of the high-voltage power supply channel.
One end of the direct current relay 3 is connected with the isolated DC/DC converter, and the other end is connected with the low-voltage power supply channel. The dc relay 3 is used to control the on and off of the power supply channel.
The following explains the implementation principle of the electronic load of the present utility model for fuel cell system testing.
As shown in fig. 2, the electronic load path is connected to the high voltage output of the fuel cell DC/DC converter, the low voltage power path is connected to the fuel cell DC/DC converter, the fuel cell engine and the fuel cell heat dissipation system, the impedance test path is connected to the high voltage output of the fuel cell engine, and the ac power interface is connected to the 380VAC power grid.
After the electronic load is connected with a 380V AC power supply, parameters of all channels of the electronic load are set through a central control screen or an upper computer. The electronic load channel is set to a bi-directional constant voltage source mode and then a target operating voltage is set. The low voltage power supply channel sets a target operating voltage. The impedance test channel is set to a self-perturbing mode. And starting a test circuit, and ensuring that the low-voltage and high-voltage power supply of the fuel cell system is normal. The fuel cell system works, and as the power of the fuel cell is increased, when the net output power of the fuel cell system is positive, the net output electric energy is fed back to the power grid through the electronic load. The impedance value of the fuel cell stack is tested during the test by sending an impedance test instruction to the impedance test module if the impedance value of the fuel cell stack is required to be tested.
The following explains the principle of implementation of the electronic load of the present utility model for fuel cell stack testing.
As shown in fig. 3, the electronic load channel is connected with the high-voltage output of the fuel cell stack, the high-voltage power channel is connected with the fuel cell system accessories, the low-voltage power channel is connected with the fuel cell stack, the fuel cell system accessories and the fuel cell heat dissipation system, and the alternating current interface is connected with the 380V AC power grid.
After the electronic load is connected with a 380V AC power supply, parameters of all channels of the electronic load are set through a central control screen or an upper computer. The electronic load channel is set to a constant current mode. The high voltage power supply channel sets a target operating voltage. The low voltage power supply channel sets a target operating voltage. The impedance test channel is set to an external perturbation mode. And starting an electronic load, and normally supplying low-voltage and high-voltage power to the fuel cell system. The fuel cell system works, the power of the fuel cell stack is controlled by adjusting the target current of the electronic load channel, and when the net output power of the fuel cell system is positive, the net output electric energy is fed back to the power grid through the electronic load. And if the impedance value of the electric pile needs to be tested in the test period, an impedance test instruction is sent to the impedance test module, the bidirectional DC/DC converter actively applies disturbance, and the impedance test module acquires the current i1 and the voltage U1 so as to calculate the alternating current impedance value of the fuel cell pile.
The embodiment of the utility model also discloses an electronic load device for testing the fuel cell, which comprises: a body and any one of the above fuel cell test electronic load circuits; the electronic load circuit is arranged in the machine body.
In summary, the electronic load of the present utility model has at least the following advantages:
1. the electronic load has 4 independent channels, and simultaneously has the functions of the electronic load, the high-voltage direct-current power supply, the low-voltage direct-current power supply and the impedance tester, so that the electronic load is powerful, convenient to use and convenient to maintain.
2. The electronic load internal power module is multiplexed, the main control board is deeply integrated, a plurality of boxes are reduced, and the cost is greatly reduced.
3. The electronic load has high integration level, compact structure, high power density, small occupied area and convenient use.
It should be noted that: the above embodiments are only for illustrating the present utility model and not for limiting the technical solutions described in the present utility model, and although the present utility model has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the present utility model may be modified or substituted by the same, and all the technical solutions and modifications thereof without departing from the spirit and scope of the present utility model are intended to be included in the scope of the claims of the present utility model.
Claims (5)
1. An electronic load circuit for fuel cell testing, comprising:
alternating current interface, alternating current relay, isolation transformer, two-way inverter, two-way DC/DC converter, direct current filter 1, shunt, direct current relay 1, electronic load channel, impedance test module, impedance test channel, insulation detection module, DC/DC converter, direct current filter 2, direct current relay 2, high voltage power supply channel, isolation DC/DC converter, direct current relay 3, low voltage power supply channel, main control module;
one end of the alternating current relay is connected with the alternating current interface, and the other end of the alternating current relay is connected with the isolation transformer;
one end of the bidirectional inverter is connected with the isolation transformer, and the other end of the bidirectional inverter is respectively connected with the bidirectional DC/DC converter, the DC/DC converter and the isolation DC/DC converter;
one end of the direct current filter 1 is connected with the bidirectional DC/DC converter, and the other end is connected with the shunt and the negative electrode of the input side of the direct current relay 1;
the shunt is connected in series between the anode of the direct current filter 1 and the anode of the input side of the direct current relay 1;
the direct current relay 1 is connected with the electronic load channel;
one end of the impedance testing module is connected with the shunt and the high-voltage circuit on the input side of the direct-current relay 1, and the other end of the impedance testing module is connected with the impedance testing channel;
the insulation detection module is connected with the high-voltage circuit at the input side of the direct-current relay 1;
one end of the direct current filter 2 is connected with the DC/DC converter, and the other end of the direct current filter is connected with the direct current relay 2;
the direct current relay 2 is connected with a high-voltage power supply channel;
one end of the direct current relay 3 is connected with the isolated DC/DC converter, and the other end is connected with the low-voltage power supply channel.
2. The electronic load circuit for fuel cell testing of claim 1, further comprising a central control screen and a communication interface; the main control module is connected with the central control screen and the communication interface.
3. An electronic load circuit for fuel cell testing according to claim 2, wherein the electronic load channels are provided with 4 channels.
4. An electronic load circuit for fuel cell testing according to claim 3, wherein said electronic load circuit further comprises a leakage protector; the alternating current interface is connected with the leakage protector; the alternating current relay is connected with the leakage protector.
5. An electronic load device for fuel cell testing, comprising: a body and a fuel cell test electronic load circuit as claimed in any one of claims 1 to 4; the electronic load circuit is arranged in the machine body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320867833.2U CN219737710U (en) | 2023-04-18 | 2023-04-18 | Electronic load circuit and equipment for fuel cell test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320867833.2U CN219737710U (en) | 2023-04-18 | 2023-04-18 | Electronic load circuit and equipment for fuel cell test |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219737710U true CN219737710U (en) | 2023-09-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320867833.2U Active CN219737710U (en) | 2023-04-18 | 2023-04-18 | Electronic load circuit and equipment for fuel cell test |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219737710U (en) |
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2023
- 2023-04-18 CN CN202320867833.2U patent/CN219737710U/en active Active
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