A CLLC control circuit for hydrogen fuel cells

Abstract

The utility model relates to a CLLC control circuit for a hydrogen fuel cell. An inverter unit, the inverter unit is connected to a power supply output, the inverter unit is used to obtain a DC power supply signal and convert the DC power supply signal into an AC power supply signal; a transformer unit, the transformer unit is connected to the inverter unit, the transformer unit is used to obtain an AC power supply signal and perform a transformer process; a rectifier unit, the rectifier unit is connected to the transformer unit, the rectifier unit is used to obtain the AC power supply signal after the transformer process, perform a rectification process, and supply power to a load. After the power supply output is converted from DC to AC by the inverter unit, it is input to the transformer unit to perform a transformer process on the AC power supply signal, and finally the transformed power supply is rectified by the rectifier unit to obtain a DC power supply signal again, which can increase the output voltage range, reduce the size of the equipment, reduce costs, improve the power conversion efficiency, and increase revenue.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen fuel cells, in particular to a CLLC control circuit for hydrogen fuel cells. Background Art

[0002] With the development of new energy technology, hydrogen fuel cells are widely used in electric vehicles and other fields as a clean new energy. When hydrogen fuel cells are used as power sources, their application areas are limited due to their slow dynamic response, wide and low output voltage range, and large fluctuations. When the fuel cell needs to be connected to the load, a bidirectional DC / DC converter with isolation and wide gain range is required for energy transmission, which can not only realize the bidirectional flow of energy, but also extend the service life of the fuel cell.

[0003] Currently, the mainstream DC / DC converters are buck converters or boost converters, which can only achieve unidirectional voltage increase or voltage reduction.

[0004] The existing unidirectional boost or buck circuit uses multi-stage converters to connect, and each DCDC converter requires an independent controller, resulting in more devices and larger size. Utility Model Content

[0005] Based on this, it is necessary to provide a CLLC control circuit for a hydrogen fuel cell that reduces the size of the device.

[0006] In a first aspect, the present application provides a CLLC control circuit for a hydrogen fuel cell, the circuit comprising:

[0007] An inverter unit, the inverter unit is connected to the power output, and the inverter unit is used to obtain a DC power signal and convert the DC power signal into an AC power signal;

[0008] A transformer unit, the transformer unit is connected to the inverter unit, and the transformer unit is used to obtain an AC power signal and perform a transformer process;

[0009] The rectifier unit is connected to the transformer unit, and is used to obtain the AC power signal after the transformer processing, perform rectification processing and supply power to the load.

[0010] In one embodiment, the inverter unit includes:

[0011] A first switch tube, a second switch tube, a third switch tube and a fourth switch tube, wherein the drain of the first switch tube is connected to the total positive electrode of the power output, the source of the first switch tube is connected to the drain of the second switch tube, the source of the second switch tube is connected to the total negative electrode of the power output, and the gates of the first switch tube and the second switch tube are respectively connected to a control module;

[0012] The drain of the third switch tube is connected to the total positive electrode of the power output, the source of the third switch tube is connected to the drain of the fourth switch tube, the source of the fourth switch tube is connected to the total negative electrode of the power output, and the gates of the third switch tube and the fourth switch tube are respectively connected to the control module.

[0013] In one embodiment, the control circuit further includes:

[0014] A resonance unit, the resonance unit comprising: a first sub-resonance unit and a second sub-resonance unit, the first sub-resonance unit is connected to the inverter unit, and the first sub-resonance unit is used to obtain an AC power signal and perform resonance processing on the AC power signal;

[0015] The second sub-resonance unit is connected to the rectifying unit, and the second sub-resonance unit is used to obtain the rectified DC power signal and perform resonance processing on the rectified DC power signal.

[0016] In one embodiment, the rectifying unit comprises:

[0017] a fifth switch tube, a sixth switch tube, a seventh switch tube and an eighth switch tube, wherein the drain of the fifth switch tube is connected to one end of the load, the source of the fifth switch tube is connected to the drain of the sixth switch tube, the source of the sixth switch tube is connected to the other end of the load, and the gates of the fifth switch tube and the sixth switch tube are respectively connected to the control module;

[0018] The drain of the seventh switch tube is connected to one end of the load, the source of the seventh switch tube is connected to the drain of the eighth switch tube, the source of the eighth switch tube is connected to the other end of the load, and the gates of the seventh switch tube and the eighth switch tube are respectively connected to the control module.

[0019] In one embodiment, the voltage transformation unit comprises:

[0020] A transformer, wherein one end of the primary side of the transformer is connected to the connection between the source of the first switch tube and the drain of the second switch tube, and the other end of the primary side of the transformer is connected to the connection between the source of the third switch tube and the drain of the fourth switch tube;

[0021] One end of the secondary side of the transformer is connected to the connection between the source of the fifth switch tube and the drain of the sixth switch tube, and the other end of the secondary side of the transformer is connected to the connection between the source of the seventh switch tube and the drain of the eighth switch tube.

[0022] In one embodiment, the first sub-resonance unit includes:

[0023] A first resonant capacitor and a first resonant inductor, one end of the first resonant inductor is connected to the connection between the source of the first switching tube and the drain of the second switching tube, the other end of the first resonant inductor is connected to one end of the first resonant capacitor, and the other end of the first resonant capacitor is connected to the primary side of the transformer.

[0024] In one embodiment, the second sub-resonance unit comprises:

[0025] A second resonant capacitor Lr2 and a second resonant inductor, one end of the second resonant inductor is connected to the connection between the source of the seventh switching tube and the drain of the eighth switching tube, the other end of the second resonant inductor is connected to one end of the second resonant capacitor Lr2, and the other end of the second resonant capacitor Lr2 is connected to the secondary side of the transformer.

[0026] In one embodiment, the control circuit further includes:

[0027] A filtering unit, the filtering unit comprising a first sub-filtering unit and a second sub-filtering unit, the first sub-filtering unit being connected to the inverter unit, the first sub-filtering unit being used to obtain a DC power signal output by a power supply and send the DC power signal to the inverter unit;

[0028] The second sub-filter unit is connected to the rectifier unit, and is used to obtain the DC power signal rectified by the rectifier unit, filter the rectified DC power signal and supply power to the load.

[0029] In one embodiment, the first sub-filtering unit comprises:

[0030] An input filter capacitor, one end of which is connected to the total positive electrode of the power supply output, and the other end of which is connected to the total negative electrode of the power supply output.

[0031] In one embodiment, the second sub-filtering unit comprises:

[0032] An output filter capacitor, one end of the output filter capacitor is connected to one end of the load, and the other end of the output filter capacitor is connected to the other end of the load.

[0033] After the power output is converted from DC to AC through the inverter unit, it is input into the transformer unit to transform the AC power signal. Finally, the transformed power is rectified by the rectifier unit to regain the DC power signal. This can increase the output voltage range, reduce the size of the equipment, reduce costs, improve power conversion efficiency, and increase profits. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 is a schematic diagram of a CLLC control circuit for a hydrogen fuel cell;

[0036] 1. Inverter unit; 2. Transformer unit; 3. Rectifier unit; 4. Resonant unit; 41. First sub-resonant unit; 42. Second sub-resonant unit; 5. Filter unit; 51. First sub-filter unit; 52. Second sub-filter unit. DETAILED DESCRIPTION

[0037] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0039] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0040] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0041] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0042] like Figure 1 As shown, a CLLC control circuit for a hydrogen fuel cell comprises:

[0043] A first sub-filter unit 515, the first sub-filter unit 515 is connected to the inverter unit 1, and the first sub-filter unit 515 is used to obtain a DC power signal output by the power supply and send the DC power signal to the inverter unit 1;

[0044] Inverter unit 1, the inverter unit 1 is connected to the first sub-filter unit 515, and the inverter unit 1 is used to obtain the DC power signal after filtering by the first filtering sub-unit and convert the DC power signal into an AC power signal and send it to the first resonance unit 4;

[0045] A first sub-resonant unit 414, the first sub-resonant unit 414 is connected to the inverter unit 1, and the first sub-resonant unit 414 is used to obtain an AC power signal and perform resonance processing on the AC power signal, and send the processed AC power signal to the transformer unit 2;

[0046] Transformation unit 2, which is connected to the first sub-resonance unit 414, and is used to obtain an AC power signal and perform a voltage transformation, and send the AC power signal after the voltage transformation to the second sub-resonance unit 424;

[0047] A second sub-resonant unit 424, the second sub-resonant unit 424 is connected to the transformer unit 2, and is used to obtain a rectified DC power signal and perform resonance processing on the rectified DC power signal, and send the DC power signal after the resonance processing to the rectifier unit 3;

[0048] The rectifier unit 3 is connected to the second sub-resonance unit 424, and is used to obtain the AC power signal after the transformation, perform rectification, and send the DC power signal after the rectification to the second sub-filter unit 525;

[0049] The second sub-filter unit 525 is connected to the rectifier unit 3. The second sub-filter unit 525 is used to obtain the DC power signal rectified by the rectifier unit 3, filter the rectified DC power signal and supply power to the load.

[0050] Through the symmetrical full-bridge CLLC converter, the output of the hydrogen fuel cell is resonantly converted, power is transmitted, and the power expansion of the converter is realized; finally, the converted AC signal is rectified by the rectifier module, and a stable voltage is output to power the load. This control circuit can reduce the control cost and improve the efficiency of the whole machine.

[0051] Specifically, Figure 1 As shown, the inverter unit 1 includes a first switch tube Q1, a second switch tube Q2, a third switch tube Q3 and a fourth switch tube Q4, the drain of the first switch tube Q1 is connected to the total positive electrode of the power output, the source of the first switch tube Q1 is connected to the drain of the second switch tube Q2, the source of the second switch tube Q2 is connected to the total negative electrode of the power output, and the gates of the first switch tube Q1 and the second switch tube Q2 are respectively connected to the control module;

[0052] The drain of the third switch tube Q3 is connected to the total positive electrode of the power output, the source of the third switch tube Q3 is connected to the drain of the fourth switch tube Q4, the source of the fourth switch tube Q4 is connected to the total negative electrode of the power output, and the gates of the third switch tube Q3 and the fourth switch tube Q4 are respectively connected to the control module.

[0053] The first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the fourth switch tube Q4 are respectively connected in parallel with an external capacitor-level diode, wherein the first switch tube Q1 and the second switch tube Q2 form a leading bridge arm, and the third switch tube Q3 and the fourth switch tube Q4 form a lagging bridge arm.

[0054] Specifically, Figure 1 As shown, the rectifier unit 3 includes: a fifth switch tube Q5, a sixth switch tube Q6, a seventh switch tube Q7 and an eighth switch tube Q8, the drain of the fifth switch tube Q5 is connected to one end of the load, the source of the fifth switch tube Q5 is connected to the drain of the sixth switch tube Q6, the source of the sixth switch tube Q6 is connected to the other end of the load, and the gates of the fifth switch tube Q5 and the sixth switch tube Q6 are respectively connected to the control module;

[0055] The drain of the seventh switch tube Q7 is connected to one end of the load, the source of the seventh switch tube Q7 is connected to the drain of the eighth switch tube Q8, the source of the eighth switch tube Q8 is connected to the other end of the load, and the gates of the seventh switch tube Q7 and the eighth switch tube Q8 are respectively connected to the control module.

[0056] The fifth switch tube Q5, the sixth switch tube Q6, the seventh switch tube Q7 and the eighth switch tube Q8 are respectively connected in parallel with an external capacitor-level diode, wherein the fifth switch tube Q5 and the sixth switch tube Q6 form a leading bridge arm, and the seventh switch tube Q7 and the eighth switch tube Q8 form a lagging bridge arm.

[0057] Specifically, Figure 1 As shown, the transformer unit 2 includes a transformer Tr, one end of the primary side of the transformer Tr is connected to the connection between the source of the first switch tube Q1 and the drain of the second switch tube Q2, and the other end of the primary side of the transformer Tr is connected to the connection between the source of the third switch tube Q3 and the drain of the fourth switch tube Q4;

[0058] One end of the secondary side of the transformer Tr is connected to the connection between the source of the fifth switch tube Q5 and the drain of the sixth switch tube Q6, and the other end of the secondary side of the transformer Tr is connected to the connection between the source of the seventh switch tube Q7 and the drain of the eighth switch tube Q8.

[0059] Specifically, Figure 1 As shown, the first sub-resonance unit 414 includes: a first resonant capacitor Cr1 and a first resonant inductor Lr1, one end of the first resonant inductor Lr1 is connected to the connection between the source of the first switch tube Q1 and the drain of the second switch tube Q2, the other end of the first resonant inductor Lr1 is connected to one end of the first resonant capacitor Cr1, and the other end of the first resonant capacitor Cr1 is connected to the primary side of the transformer Tr.

[0060] The second sub-resonance unit 424 includes: a second resonant capacitor Cr2 and a second resonant inductor Lr2, one end of the second resonant inductor Lr2 is connected to the connection between the source of the seventh switch tube Q7 and the drain of the eighth switch tube Q8, the other end of the second resonant inductor Lr2 is connected to one end of the second resonant capacitor Cr2, and the other end of the second resonant capacitor Cr2 is connected to the secondary side of the transformer Tr.

[0061] Specifically, Figure 1 As shown, the first sub-filter unit 515 includes: an input filter capacitor Cin, one end of the input filter capacitor Cin is connected to the total positive electrode of the power output, and the other end of the input filter capacitor Cin is connected to the total negative electrode of the power output.

[0062] The second sub-filter unit 525 includes: an output filter capacitor Co, one end of the output filter capacitor Co is connected to one end of the load, and the other end of the output filter capacitor Co is connected to the other end of the load.

[0063] In the description of this specification, the descriptions with reference to the terms "some embodiments", "other embodiments", "ideal embodiments", etc., mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the utility model. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0064] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A CLLC control circuit for a hydrogen fuel cell, characterized in that: The control circuit comprises: An inverter unit, the inverter unit is connected to the power output, and the inverter unit is used to obtain a DC power signal and convert the DC power signal into an AC power signal; A transformer unit, the transformer unit is connected to the inverter unit, and the transformer unit is used to obtain an AC power signal and perform a transformer process; The rectifier unit is connected to the transformer unit, and is used to obtain the AC power signal after the transformer processing, perform rectification processing and supply power to the load.

2. The CLLC control circuit for a hydrogen fuel cell according to claim 1, characterized in that: The inverter unit comprises: A first switch tube, a second switch tube, a third switch tube and a fourth switch tube, wherein the drain of the first switch tube is connected to the total positive electrode of the power output, the source of the first switch tube is connected to the drain of the second switch tube, the source of the second switch tube is connected to the total negative electrode of the power output, and the gates of the first switch tube and the second switch tube are respectively connected to a control module; The drain of the third switch tube is connected to the total positive electrode of the power output, the source of the third switch tube is connected to the drain of the fourth switch tube, the source of the fourth switch tube is connected to the total negative electrode of the power output, and the gates of the third switch tube and the fourth switch tube are respectively connected to the control module.

3. The CLLC control circuit for a hydrogen fuel cell according to claim 2, characterized in that: The control circuit further comprises: A resonance unit, the resonance unit comprising: a first sub-resonance unit and a second sub-resonance unit, the first sub-resonance unit is connected to the inverter unit, and the first sub-resonance unit is used to obtain an AC power signal and perform resonance processing on the AC power signal; The second sub-resonance unit is connected to the rectifying unit, and the second sub-resonance unit is used to obtain the rectified DC power signal and perform resonance processing on the rectified DC power signal.

4. The CLLC control circuit for a hydrogen fuel cell according to claim 2, characterized in that: The rectifying unit comprises: a fifth switch tube, a sixth switch tube, a seventh switch tube and an eighth switch tube, wherein the drain of the fifth switch tube is connected to one end of the load, the source of the fifth switch tube is connected to the drain of the sixth switch tube, the source of the sixth switch tube is connected to the other end of the load, and the gates of the fifth switch tube and the sixth switch tube are respectively connected to the control module; The drain of the seventh switch tube is connected to one end of the load, the source of the seventh switch tube is connected to the drain of the eighth switch tube, the source of the eighth switch tube is connected to the other end of the load, and the gates of the seventh switch tube and the eighth switch tube are respectively connected to the control module.

5. The CLLC control circuit for a hydrogen fuel cell according to claim 4, characterized in that: The transformer unit comprises: A transformer, wherein one end of the primary side of the transformer is connected to the connection between the source of the first switch tube and the drain of the second switch tube, and the other end of the primary side of the transformer is connected to the connection between the source of the third switch tube and the drain of the fourth switch tube; One end of the secondary side of the transformer is connected to the connection between the source of the fifth switch tube and the drain of the sixth switch tube, and the other end of the secondary side of the transformer is connected to the connection between the source of the seventh switch tube and the drain of the eighth switch tube.

6. The CLLC control circuit for a hydrogen fuel cell according to claim 5, characterized in that: The first sub-resonance unit comprises: A first resonant capacitor and a first resonant inductor, one end of the first resonant inductor is connected to the connection between the source of the first switching tube and the drain of the second switching tube, the other end of the first resonant inductor is connected to one end of the first resonant capacitor, and the other end of the first resonant capacitor is connected to the primary side of the transformer.

7. The CLLC control circuit for a hydrogen fuel cell according to claim 3, characterized in that: The second sub-resonance unit comprises: A second resonant capacitor Lr2 and a second resonant inductor, one end of the second resonant inductor is connected to the connection between the source of the seventh switching tube and the drain of the eighth switching tube, the other end of the second resonant inductor is connected to one end of the second resonant capacitor Lr2, and the other end of the second resonant capacitor Lr2 is connected to the secondary side of the transformer.

8. The CLLC control circuit for a hydrogen fuel cell according to claim 1, characterized in that: The control circuit further comprises: A filtering unit, the filtering unit comprising a first sub-filtering unit and a second sub-filtering unit, the first sub-filtering unit being connected to the inverter unit, the first sub-filtering unit being used to obtain a DC power signal output by a power supply and send the DC power signal to the inverter unit; The second sub-filter unit is connected to the rectifier unit, and is used to obtain the DC power signal rectified by the rectifier unit, filter the rectified DC power signal and supply power to the load.

9. The CLLC control circuit for a hydrogen fuel cell according to claim 8, characterized in that: The first sub-filtering unit comprises: An input filter capacitor, one end of which is connected to the total positive electrode of the power supply output, and the other end of which is connected to the total negative electrode of the power supply output.

10. The CLLC control circuit for a hydrogen fuel cell according to claim 8, characterized in that: The second sub-filtering unit comprises: An output filter capacitor, one end of the output filter capacitor is connected to one end of the load, and the other end of the output filter capacitor is connected to the other end of the load.

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