Control circuit and control system

Abstract

The utility model relates to a control circuit, which solves the problems that in a high-power mode, a device cannot be selected, the heating loss of the device is large and the like through the LLC front-end parallel design. According to the LLC rear end self-adaptive series-parallel design, the voltage of a client connected to a solar panel can be automatically recognized, LLC rear end series-parallel connection can be achieved through a controllable tube Q1, a vehicle battery pack is connected through a BOOST circuit, photovoltaic maximum power charging is achieved through MPPT, and due to the fact that all the intermediate links are in the optimal working mode, the overall charging efficiency is designed to be optimal.

Description

Technical Field

[0001] The utility model relates to the field of electricity, and particularly relates to a control circuit and a control system. Background Technique

[0002] At present, the functions of in-vehicle photovoltaic controllers are single. They mainly charge the vehicle's battery, convert DC low voltage to low voltage, and the battery mainly supplies power to the vehicle's low-voltage electrical appliances. There is no obvious economic benefit generated, and they are all independent systems without communication with the in-vehicle system, so it is impossible to calculate the generated economic benefit.

[0003] Currently, the following problems exist in the vehicle battery charging test:

[0004] 1. On the front-stage solar side, a parallel connection method is often used to provide a larger charging power. Since the voltage on the solar panel side is usually low (30V or 60V), when the power increases after parallel connection, the current will become very large, resulting in the inability to select components on the LLC side. For example, when the voltage on the solar panel side is 30V and an input power of 2kW needs to be achieved, the current has reached 67A, and the component selection, load-bearing capacity, and efficiency are all greatly challenged.

[0005] 2. When using low-voltage solar panels, the voltage on the right side of the LLC will also decrease accordingly, and the BOOST side will not be able to achieve maximum efficiency control, affecting the overall photovoltaic charging efficiency. Content of the Utility Model

[0006] The purpose of the utility model is to provide a control circuit and a control system to solve the problems of component selection, load-bearing, and efficiency conversion.

[0007] To achieve the above purpose, the utility model is realized through the following technical solutions:

[0008] On the one hand, a control circuit is provided, including: an adaptive circuit, a boost circuit, and at least two LLC circuits; the at least two LLC circuits include: a first LLC circuit and a second LLC circuit;

[0009] The first LLC circuit includes: a first field-effect transistor, a second field-effect transistor, a third field-effect transistor, a fourth field-effect transistor, a first inductor, a first capacitor, a first transformer, a first diode, and a second diode;

[0010] One end of the first inductor is connected to one end of the first field - effect transistor, and one end of the first inductor is connected to one end of the third field - effect transistor. The other end of the first inductor is connected to one end of the first capacitor; One end of the first field - effect transistor is connected to one end of the third field - effect transistor, and the other end of the first field - effect transistor is connected to one end of the second field - effect transistor; The other end of the second field - effect transistor is connected to one end of the fourth field - effect transistor; The other end of the fourth field - effect transistor is connected to the other end of the third field - effect transistor; The other end of the first capacitor is connected to a tap at one end of the primary coil of the first transformer; One end of the fourth field - effect transistor is connected to a tap at the other end of the primary coil of the first transformer; The positive electrode of the first diode is connected to a tap at one end of the secondary coil of the first transformer; The positive electrode of the second diode is connected to a tap at the other end of the secondary coil of the first transformer; The negative electrode of the first diode is connected to the negative electrode of the second diode;

[0011] The second LLC circuit includes: a fifth field - effect transistor, a sixth field - effect transistor, a seventh field - effect transistor, an eighth field - effect transistor, a second inductor, a second capacitor, a second transformer, a third diode, and a fourth diode;

[0012] One end of the second inductor is connected to one end of the fifth field - effect transistor, and one end of the second inductor is connected to one end of the seventh field - effect transistor. The other end of the second inductor is connected to one end of the second capacitor; One end of the fifth field - effect transistor is connected to one end of the seventh field - effect transistor, and the other end of the fifth field - effect transistor is connected to one end of the sixth field - effect transistor; The other end of the sixth field - effect transistor is connected to one end of the eighth field - effect transistor; The other end of the eighth field - effect transistor is connected to the other end of the seventh field - effect transistor; The other end of the second capacitor is connected to a tap at one end of the primary coil of the second transformer; One end of the eighth field - effect transistor is connected to a tap at the other end of the primary coil of the second transformer; The positive electrode of the third diode is connected to a tap at one end of the secondary coil of the second transformer; The positive electrode of the fourth diode is connected to a tap at the other end of the secondary coil of the second transformer; The negative electrode of the third diode is connected to the negative electrode of the fourth diode;

[0013] The negative electrode of the second diode is connected to the negative electrode of the third diode;

[0014] The adaptive circuit includes a MOSFET transistor. The drain - extreme of the MOSFET transistor is connected to an intermediate tap of the secondary coil of the first transformer where the negative electrode is connected, and the source - extreme of the MOSFET transistor is connected to the negative electrode of the third diode;

[0015] The drain - extreme of the MOSFET transistor is connected to the boost circuit.

[0016] Preferably, the adaptive circuit further includes: a fifth diode;

[0017] The anode of the fifth diode is connected to the cathode of the third diode, and the cathode of the fifth diode is connected to the cathode of the second diode.

[0018] Preferably, the adaptive circuit further includes: a sixth diode;

[0019] The cathode of the sixth diode is connected to the drain terminal of the MOSFET, the anode of the sixth diode is connected to the boost circuit, and the anode of the sixth diode is connected to the center tap of the secondary coil of the second transformer.

[0020] Preferably, the boost circuit includes: a third capacitor, a third inductor, a seventh diode, a ninth field effect transistor, and a tenth field effect transistor;

[0021] One end of the third capacitor is connected to one end of the third inductor, and the other end of the third capacitor is connected to the anode of the sixth diode;

[0022] The other end of the third inductor is connected to the anode of the seventh diode;

[0023] One end of the ninth field effect transistor is connected to the other end of the third inductor, and the other end of the ninth field effect transistor is connected to the other end of the third capacitor;

[0024] One end of the tenth field effect transistor is connected to the cathode of the seventh diode, and the other end of the tenth field effect transistor is connected to the other end of the third capacitor.

[0025] Preferably, the first capacitor is a polypropylene film capacitor.

[0026] Preferably, both the first diode and the second diode are fast recovery diodes.

[0027] Preferably, the third capacitor is an electrolytic capacitor.

[0028] Preferably, one end of the first field effect transistor is also connected to one end of the corresponding solar panel, and the other end of the third field effect transistor is connected to the other end of the corresponding solar panel;

[0029] One end of the fifth field effect transistor is also connected to one end of the corresponding another solar panel, and the other end of the seventh field effect transistor is connected to the other end of the corresponding solar panel.

[0030] Preferably, the cathode of the seventh diode is connected to the load charging device;

[0031] The other end of the tenth field effect transistor is connected to the load charging device.

[0032] On the other hand, a control system is provided, including the control circuit described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0034] Figure 1 It is a schematic structural diagram of the control circuit of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] The technical solutions in multiple embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments, and the embodiments in the present utility model can be combined with each other. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0036] Embodiment 1

[0037] As Figure 1 shown, this embodiment provides a control circuit, including: an adaptive circuit, a boost circuit, and at least two LLC circuits; the at least two LLC circuits include: a first LLC circuit and a second LLC circuit.

[0038] The first LLC circuit includes: a first field effect transistor M1, a second field effect transistor M2, a third field effect transistor M3, a fourth field effect transistor M4, a first inductor L1, a first capacitor C1, a first transformer L3, a first diode D1, and a second diode D2.

[0039] One end of the first inductor L1 is connected to one end of the first field-effect transistor M1, and one end of the first inductor L1 is connected to one end of the third field-effect transistor M3. The other end of the first inductor L1 is connected to one end of the first capacitor C1. One end of the first field-effect transistor M1 is connected to one end of the third field-effect transistor M3. The other end of the first field-effect transistor M1 is connected to one end of the second field-effect transistor M2. The other end of the second field-effect transistor M2 is connected to one end of the fourth field-effect transistor M4. The other end of the fourth field-effect transistor M4 is connected to the other end of the third field-effect transistor M3. The other end of the first capacitor C1 is connected to a tap at one end of the primary coil of the first transformer L3. One end of the fourth field-effect transistor M4 is connected to a tap at the other end of the primary coil of the first transformer L3. The positive electrode of the first diode D1 is connected to a tap at one end of the secondary coil of the first transformer L3. The positive electrode of the second diode D2 is connected to a tap at the other end of the secondary coil of the first transformer L3. The negative electrode of the first diode D1 is connected to the negative electrode of the second diode D2.

[0040] The second LLC circuit includes: a fifth field-effect transistor M5, a sixth field-effect transistor M6, a seventh field-effect transistor M7, an eighth field-effect transistor M8, a second inductor L2, a second capacitor C2, a second transformer L4, a third diode D3, and a fourth diode D4.

[0041] One end of the second inductor L2 is connected to one end of the fifth field-effect transistor M5, and one end of the second inductor L2 is connected to one end of the seventh field-effect transistor M7. The other end of the second inductor L2 is connected to one end of the second capacitor C2. One end of the fifth field-effect transistor M5 is connected to one end of the seventh field-effect transistor M7. The other end of the fifth field-effect transistor M5 is connected to one end of the sixth field-effect transistor M6. The other end of the sixth field-effect transistor M6 is connected to one end of the eighth field-effect transistor M8. The other end of the eighth field-effect transistor M8 is connected to the other end of the seventh field-effect transistor M7. The other end of the second capacitor C2 is connected to a tap at one end of the primary coil of the second transformer L4. One end of the eighth field-effect transistor M8 is connected to a tap at the other end of the primary coil of the second transformer L4. The positive electrode of the third diode D3 is connected to a tap at one end of the secondary coil of the second transformer L4. The positive electrode of the fourth diode D4 is connected to a tap at the other end of the secondary coil of the second transformer L4. The negative electrode of the third diode D3 is connected to the negative electrode of the fourth diode D4.

[0042] The negative electrode of the second diode D2 is connected to the negative electrode of the third diode D3.

[0043] The adaptive circuit includes an MOSFET Q1. The drain terminal of the MOSFET Q1 is connected to the middle tap of the secondary coil of the first transformer L3 where the negative pole is connected. The source terminal of the MOSFET Q1 is connected to the negative pole of the third diode D3. The drain terminal of the MOSFET Q1 is connected to the boost circuit.

[0044] In one embodiment, one end of the first field-effect transistor M1 is also connected to one end of the corresponding solar panel, and the other end of the third field-effect transistor M3 is connected to the other end of the corresponding solar panel.

[0045] In one embodiment, one end of the fifth field-effect transistor M5 is also connected to one end of the corresponding another solar panel, and the other end of the seventh field-effect transistor M7 is connected to the other end of the corresponding solar panel.

[0046] In one embodiment, the adaptive circuit further includes: a fifth diode D5. The positive pole of the fifth diode D5 is connected to the negative pole of the third diode D3, and the negative pole of the fifth diode D5 is connected to the negative pole of the second diode D2.

[0047] In one embodiment, the adaptive circuit further includes: a sixth diode D6. The negative pole of the sixth diode D6 is connected to the drain terminal of the MOSFET Q1, the positive pole of the sixth diode D6 is connected to the boost circuit, and the positive pole of the sixth diode D6 is connected to the middle tap of the secondary coil of the second transformer L4.

[0048] In one embodiment, the boost circuit includes: a third capacitor C3, a third inductor L5, a seventh diode D7, a ninth MOSFET Q2 and a tenth MOSFET Q3. One end of the third capacitor C3 is connected to one end of the third inductor L5, and the other end of the third capacitor C3 is connected to the positive pole of the sixth diode D6. The other end of the third inductor L5 is connected to the positive pole of the seventh diode D7. One end of the ninth MOSFET Q2 is connected to the other end of the third inductor L5, and the other end of the ninth MOSFET Q2 is connected to the other end of the third capacitor C3. One end of the tenth MOSFET Q3 is connected to the negative pole of the seventh diode D7, and the other end of the tenth MOSFET Q3 is connected to the other end of the third capacitor C3.

[0049] In one embodiment, the negative pole of the seventh diode D7 is connected to the load charging device, and the other end of the tenth MOSFET Q3 is connected to the load charging device.

[0050] The first capacitor C1 and the second capacitor C2 can be polypropylene film capacitors, and the model can be 300 nF / 100 V. The third capacitor C3 is an electrolytic capacitor, and the model can be 250 MXG330MEFCSN22X3. The type of the above-mentioned diode is not limited and can be a fast recovery diode, and the model can be MUR3060P. The models of the above-mentioned field effect transistors M1, M2, M3, M4, M5, M6, M7, M8 can be NCEP026N10T. The model of the MOSFET transistor Q1 can be STW26NM60N. The ninth field effect transistor Q2 can be a silicon carbide mosfet, and the model can be C3M0040120K. The model of the tenth field effect transistor Q3 can be STD3NK90ZT4. The models of the inductors L1, L2, L5 and the transformers L3, L4 can be customized and developed according to the turn ratio.

[0051] When multiple 60V photovoltaic panels are connected, they can be connected in parallel and evenly to the solar panel 1N and solar panel 2N ports. The 60V voltage passes through the LLC circuit. When operating at the resonant point, the voltage on the right side of L3 and L4 is 300V (not limited to this value). When the system detects that the voltage at the solar panel terminal is 60V, Q1 is in the off state, and the LLC output is connected in parallel through D5 / D6 to shunt the current of the components, so as to adapt to the problem that the LLC device cannot be selected due to its inability to carry large current under the condition of low-voltage solar panel power supply, and multiple-stage photovoltaic panel parallel connection for higher-power charging can be realized.

[0052] When multiple 30V photovoltaic panels are connected, they can be connected in parallel and evenly to the solar panel 1N and solar panel 2N ports. The 30V voltage passes through the LLC circuit. When operating at the resonant point, the voltage on the right side of L3 and L4 is 150V (not limited to this value). When the system detects that the voltage at the solar panel terminal is 30V, Q1 is in the on state, and the LLC output is connected in series through Q1. The controllable transistor Q1 plays a series connection role. The voltage of C3 is 300V (not limited to this value) at this time, and then it is connected to the vehicle battery through the BOOST circuit, and maximum power charging is carried out through MPPT, and maximum-efficiency charging of solar panels with different voltage specifications can be realized.

[0053] The parallel design at the front end of the LLC in this application solves problems such as the inability to select components and large heat loss of components in the high-power mode; the adaptive series-parallel design at the back end of the LLC can automatically identify the voltage of the solar panel accessed by the customer, and realize the series-parallel connection at the back end of the LLC through the controllable transistor Q1, connect to the vehicle battery pack through the BOOST circuit, and realize the maximum power charging of the photovoltaic through MPPT. Since all intermediate links are in the optimal working mode, the overall charging efficiency is optimized.

[0054] Embodiment 2

[0055] This embodiment provides a control system, including the control circuit described above.

[0056] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0057] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A control circuit, characterized in that, Including: An adaptive circuit, a boost circuit, and at least two LLC circuits; The at least two LLC circuits include: a first LLC circuit and a second LLC circuit; The first LLC circuit includes: a first field-effect transistor, a second field-effect transistor, a third field-effect transistor, a fourth field-effect transistor, a first inductor, a first capacitor, a first transformer, a first diode, and a second diode; One end of the first inductor is connected to one end of the first field-effect transistor, and one end of the first inductor is connected to one end of the third field-effect transistor. The other end of the first inductor is connected to one end of the first capacitor. One end of the first field-effect transistor is connected to one end of the third field-effect transistor. The other end of the first field-effect transistor is connected to one end of the second field-effect transistor. The other end of the second field-effect transistor is connected to one end of the fourth field-effect transistor. The other end of the fourth field-effect transistor is connected to the other end of the third field-effect transistor. The other end of the first capacitor is connected to a tap at one end of the primary coil of the first transformer. One end of the fourth field-effect transistor is connected to a tap at the other end of the primary coil of the first transformer. The positive electrode of the first diode is connected to a tap at one end of the secondary coil of the first transformer. The positive electrode of the second diode is connected to a tap at the other end of the secondary coil of the first transformer. The negative electrode of the first diode is connected to the negative electrode of the second diode; The second LLC circuit includes: a fifth field-effect transistor, a sixth field-effect transistor, a seventh field-effect transistor, an eighth field-effect transistor, a second inductor, a second capacitor, a second transformer, a third diode, and a fourth diode; One end of the second inductor is connected to one end of the fifth field-effect transistor, and one end of the second inductor is connected to one end of the seventh field-effect transistor. The other end of the second inductor is connected to one end of the second capacitor. One end of the fifth field-effect transistor is connected to one end of the seventh field-effect transistor. The other end of the fifth field-effect transistor is connected to one end of the sixth field-effect transistor. The other end of the sixth field-effect transistor is connected to one end of the eighth field-effect transistor. The other end of the eighth field-effect transistor is connected to the other end of the seventh field-effect transistor. The other end of the second capacitor is connected to a tap at one end of the primary coil of the second transformer. One end of the eighth field-effect transistor is connected to a tap at the other end of the primary coil of the second transformer. The positive electrode of the third diode is connected to a tap at one end of the secondary coil of the second transformer. The positive electrode of the fourth diode is connected to a tap at the other end of the secondary coil of the second transformer. The negative electrode of the third diode is connected to the negative electrode of the fourth diode; The negative electrode of the second diode is connected to the negative electrode of the third diode; The adaptive circuit includes a MOSFET transistor. The drain terminal of the MOSFET transistor is connected to a middle tap of the secondary coil of the first transformer where the negative pole is connected. The source terminal of the MOSFET transistor is connected to the negative electrode of the third diode; The drain terminal of the MOSFET transistor is connected to the boost circuit.

2. The control circuit according to claim 1, characterized in that, The adaptive circuit further includes: a fifth diode; The positive electrode of the fifth diode is connected to the negative electrode of the third diode, and the negative electrode of the fifth diode is connected to the negative electrode of the second diode.

3. The control circuit according to claim 1, wherein The adaptive circuit further includes: a sixth diode; The negative electrode of the sixth diode is connected to the drain terminal of the MOSFET transistor, the positive electrode of the sixth diode is connected to the boost circuit, and the positive electrode of the sixth diode is connected to the center tap of the secondary coil of the second transformer.

4. The control circuit according to claim 3, characterized in that, The boost circuit includes: a third capacitor, a third inductor, a seventh diode, a ninth field effect transistor, and a tenth field effect transistor; One end of the third capacitor is connected to one end of the third inductor, and the other end of the third capacitor is connected to the positive electrode of the sixth diode; The other end of the third inductor is connected to the positive electrode of the seventh diode; One end of the ninth field effect transistor is connected to the other end of the third inductor, and the other end of the ninth field effect transistor is connected to the other end of the third capacitor; One end of the tenth field effect transistor is connected to the negative electrode of the seventh diode, and the other end of the tenth field effect transistor is connected to the other end of the third capacitor.

5. A control circuit according to claim 1, wherein The first capacitor is a polypropylene film capacitor.

6. The control circuit according to claim 1, wherein, Both the first diode and the second diode are fast recovery diodes.

7. A control circuit according to claim 4, wherein The third capacitor is an electrolytic capacitor.

8. A control circuit according to claim 1, wherein One end of the first field effect transistor is further connected to one end of the corresponding solar panel, and the other end of the third field effect transistor is connected to the other end of the corresponding solar panel; One end of the fifth field effect transistor is further connected to one end of the corresponding another solar panel, and the other end of the seventh field effect transistor is connected to the other end of the corresponding solar panel.

9. A control circuit according to claim 4, characterized in that, The negative electrode of the seventh diode is connected to the load charging device; The other end of the tenth field effect transistor is connected to the load charging device.

10. A control system, comprising the control circuit according to any one of claims 1-9.

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