Multi-path photovoltaic equalizing charging device and method

Abstract

The invention relates to a multi-path photovoltaic equalizing charging device and a multi-path photovoltaic equalizing charging method. The device comprises a plurality of photovoltaic panels, MOS tubes and a controller, the photovoltaic panels are connected with the MOS tubes, the MOS tubes are connected with the controller, and booster circuits are arranged between the photovoltaic panels and the MOS tubes. According to the invention, the plurality of photovoltaic panels are connected with the boost circuit and then are connected with the controller, so that the plurality of photovoltaic panels are boosted and then the storage battery is charged through the controller, the existing photovoltaic panel resources can be utilized to carry out intelligent and balanced charging on the storage battery by the plurality of paths of photovoltaic panels, and the replacement frequency of the storage battery can be reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of photovoltaic charging, and particularly to an equalizing charging device and method for multiple paths of photovoltaic. Background Art

[0002] The field acquisition equipment for petroleum geophysical prospecting is powered by a single-path photovoltaic panel plus a storage battery. When the field sunshine time is insufficient, the battery needs to be frequently transported back to the camp for charging, which affects the production efficiency and increases the labor intensity. In addition, due to different models and degrees of newness and oldness, there are also differences in the power generation efficiency of photovoltaic panels, and such differences will also affect the charging effect. Summary of the Invention

[0003] In order to solve the above technical problems or at least partially solve the above technical problems, embodiments of the present disclosure provide an equalizing charging device and method for multiple paths of photovoltaic.

[0004] In a first aspect, embodiments of the present disclosure provide an equalizing charging device for multiple paths of photovoltaic. The device includes: a plurality of photovoltaic panels, MOS transistors, and a controller. The photovoltaic panels are all connected to the MOS transistors, the MOS transistors are connected to the controller, and a boost circuit is provided between the photovoltaic panels and the MOS transistors.

[0005] In a possible implementation manner, the boost circuit includes an input switch and an output filter circuit. The input switch is connected to the photovoltaic panel, and a filter capacitor, a core boost circuit, and a voltage output adjustment circuit are sequentially provided between the input switch and the output filter circuit.

[0006] In a possible implementation manner, three filter capacitors are provided between the input switch and the output filter circuit.

[0007] In a possible implementation manner, the core boost circuit includes a power supply, an inductor, and a diode.

[0008] In a possible implementation manner, the voltage output adjustment circuit includes a plurality of resistors.

[0009] In a possible implementation manner, the controller includes a voltage division circuit and a switch circuit, and the voltage division circuit is connected to the switch circuit.

[0010] In a possible implementation manner, the controller includes a plurality of power input ports and a group of power output ports.

[0011] In a possible implementation manner, the equalizing charging device for multiple paths of photovoltaic further includes an intelligent protection board, and a power input port of the intelligent protection board is connected to a power output port of the controller.

[0012] In a possible implementation, the multi-channel photovoltaic equalizing charging device further includes a voltage detection module, and the voltage detection module is respectively connected to the boost circuit and the MOS transistor.

[0013] Second, an embodiment of the present disclosure provides a multi-channel photovoltaic equalizing charging method, and the method includes:

[0014] Using a boost circuit to boost the voltage of multiple photovoltaic panels until the photovoltaic panels reach a preset output voltage;

[0015] Connecting multiple photovoltaic panels that have reached the preset output voltage in parallel and connecting them to a controller;

[0016] Using the controller to reduce the voltage to within a preset safe voltage range and then performing charging.

[0017] The above technical solutions provided by the embodiments of the present disclosure compared with the prior art have at least some or all of the following advantages:

[0018] For the multi-channel photovoltaic equalizing charging device described in the embodiments of the present disclosure, after connecting multiple photovoltaic panels to the boost circuit and then connecting them to the controller, it realizes boosting multiple photovoltaic panels and then charging the storage battery through the controller. It can utilize the existing photovoltaic panel resources to perform intelligent equalizing charging of multiple photovoltaic panels on the battery, and can reduce the frequency of battery replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present disclosure and used together with the specification to explain the principles of the present disclosure.

[0020] To more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the accompanying drawings required for use in the description of the embodiments or related technologies. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 Schematically shows a structural block diagram of a multi-channel photovoltaic equalizing charging device according to an embodiment of the present disclosure;

[0022] Figure 2 Schematically shows a circuit diagram of a multi-channel photovoltaic equalizing charging device according to an embodiment of the present disclosure;

[0023] Figure 3 Schematically shows a circuit diagram of intelligent positive and negative pole identification in a controller according to an embodiment of the present disclosure;

[0024] Figure 4Schematically shows a circuit diagram of an equalizing charging device for multi-channel photovoltaics according to a specific embodiment of the present disclosure;

[0025] Figure 5 Schematically shows a schematic flow diagram of a multi-channel photovoltaic equalizing charging method according to a specific embodiment of the present disclosure;

[0026] Figure 6 Schematically shows a schematic flow diagram of a multi-channel photovoltaic equalizing charging method according to a specific embodiment of the present disclosure. Detailed Embodiment

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are some but not all of the embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts fall within the scope of protection of the present disclosure.

[0028] In this embodiment, the meanings of the solar panels and the photovoltaic panels are the same.

[0029] See Figure 1 , an embodiment of the present disclosure provides an equalizing charging device for multi-channel photovoltaics. The device includes: a plurality of photovoltaic panels, MOS transistors, and a controller. The photovoltaic panels are all connected to the MOS transistors, the MOS transistors are connected to the controller, and a boost circuit is provided between the photovoltaic panels and the MOS transistors.

[0030] For the equalizing charging device for multi-channel photovoltaics described in the embodiments of the present disclosure, after connecting a plurality of photovoltaic panels to a boost circuit and then connecting to a controller, it realizes charging a storage battery through the controller after boosting the plurality of photovoltaic panels, can use the existing photovoltaic panel resources to perform intelligent equalizing charging of a plurality of photovoltaic panels on the battery, and can reduce the battery replacement frequency.

[0031] In an optional embodiment of the present disclosure, the boost circuit includes an input switch and an output filter circuit. The input switch is connected to the photovoltaic panel, and a filter capacitor, a core boost circuit, and a voltage output adjustment circuit are sequentially provided between the input switch and the output filter circuit.

[0032] Figure 2 Is a circuit diagram of an equalizing charging device for multi-channel photovoltaics in an optional embodiment of the present disclosure; See Figure 2, the device includes two paths of photovoltaic panels (photovoltaic panel 1 and photovoltaic panel 2), and each path of photovoltaic panel is connected with a path of boost circuit (XL6009 boost module). The boost circuits are exactly the same. Taking photovoltaic panel 1 as an example, photovoltaic panel 1 is first connected to the input switch P4 of the boost circuit, and then passes through three filter capacitors C11, C5, and C4 and is sent to the core boost circuit composed of power supply U1, inductor L1, and diode D1 for boosting. Resistors R1 and R8 are the voltage output adjustment circuit of the XL6009 boost module. The output voltage can be calculated according to the formula Vout = 1.25 * (1 + R8 / R1). Therefore, by adjusting the ratio of R1 and R8, the target output voltage of the boost circuit can be set. Filter capacitors C1 and C2 are the post-stage output filter circuits respectively.

[0033] In an optional embodiment of the present disclosure, three filter capacitors are provided between the input switch and the output filter circuit.

[0034] See Figure 2 , in the boost circuit connected to photovoltaic panel 1, three filter capacitors C11, C5, and C4 are provided between the input switch and the output filter circuit.

[0035] In an optional embodiment of the present disclosure, the core boost circuit includes a power supply, an inductor, and a diode.

[0036] See Figure 2 , in the boost circuit connected to photovoltaic panel 1, the core boost circuit composed of power supply U1, inductor L1, and diode D1 boosts the voltage of photovoltaic panel 1.

[0037] In an optional embodiment of the present disclosure, the voltage output adjustment circuit includes multiple resistors.

[0038] See Figure 2 , in the boost circuit connected to photovoltaic panel 1, resistors R1 and R8 form the voltage output adjustment circuit. The output voltage can be calculated according to the formula Vout = 1.25 * (1 + R8 / R1). Therefore, by adjusting the ratio of R1 and R8, the purpose of setting the target output voltage of the boost circuit can be achieved.

[0039] In an optional embodiment of the present disclosure, the controller includes a voltage division circuit and a switch circuit, and the voltage division circuit is connected to the switch circuit.

[0040] Figure 3 It is the intelligent identification circuit diagram of the positive and negative poles in the controller; See Figure 3, resistors R1, R2, and R3 form a voltage-dividing circuit. According to Ohm's law, if the positive terminal of the battery is connected to the side of resistor R1, the voltage at AD1 in the circuit is higher than that at AD2. If the positive terminal of the battery is connected to the side of R2, the voltage at AD2 is higher than that at AD1. By judging the voltage magnitudes at AD1 and AD2, the connection direction of the battery electrodes can be known, and then switches K1 and K2 are adjusted to make the charging voltage direction match the battery polarity. Diodes D1 and D2 form an overvoltage protection circuit, and K3 controls the start and stop of charging.

[0041] In an optional embodiment of the present disclosure, the controller includes multiple power input ports and a group of power output ports.

[0042] Specifically, the controller can have three groups of solar panel power input ports and a group of power output ports. The power output port is connected to the power input port of the intelligent protection board, and at the same time, a group of terminals is led out of the casing for an external charger to charge the battery.

[0043] In an optional embodiment of the present disclosure, the multi-channel photovoltaic equalizing charging device further includes an intelligent protection board, and the power input port of the intelligent protection board is connected to the power output port of the controller.

[0044] Specifically, the intelligent protection board has one power output port, one battery charge and discharge interface, and three battery charge and discharge interfaces. Among them, the power output interface is led out of the casing for other devices to use.

[0045] In an optional embodiment of the present disclosure, the multi-channel photovoltaic equalizing charging device further includes a voltage detection module, and the voltage detection module is respectively connected to the boost circuit and the MOS transistor.

[0046] See Figure 2 , resistors R2, R5, and filter capacitor C3 form a voltage detection circuit, where it can be connected to the analog-to-digital converter ADC of the controller MCU, and can display the output voltage of the solar panel in real time. Switch Q10 and resistor R11 play the roles of preventing reverse connection and preventing current backflow, and protect the front-stage circuit.

[0047] See Figures 1 to 4 , a specific embodiment of the multi-channel photovoltaic equalizing charging device provided by the embodiment of the present disclosure is:

[0048] See Figure 1 , this device is composed of photovoltaic panel 1, photovoltaic panel 2, boost circuit 1, boost circuit 2, MOS transistor, and controller. Circuit schematic diagram description: See Figure 2, the circuits in the upper and lower boxes are the boost circuits for two solar panels respectively, and the circuits are exactly the same. Taking the photovoltaic panel 1 as an example, when the solar panel (i.e., the photovoltaic panel) is connected, it first passes through an input switch P4, and then through three filter capacitors C11, C5, and C4, and is sent to the core boost circuit composed of U1, L1, and D1 for boosting. R1 and R8 are the voltage output adjustment circuits of the XL6009 boost module. The output voltage can be calculated according to the formula Vout = 1.25 * (1 + R8 / R1). Therefore, by adjusting the ratio of R1 and R8, the target output voltage of the boost circuit can be set. C1 and C2 are the post-stage output filter circuits respectively. R2, R5, and C3 constitute a voltage detection circuit, where the analog-to-digital converter ADC of the controller MCU can be connected to achieve real-time display of the output voltage of the solar panel. Q10 and R11 play the role of preventing reverse connection and preventing current backflow, protecting the pre-stage circuit.

[0049] Inside the lithium battery protection board, the positive and negative poles of the output are first identified by circuits and programs. After successful identification, power is supplied to the device through relay control, ensuring that the positive and negative poles of external devices can be connected randomly, increasing the safety of the device and improving work efficiency.

[0050] The specific method is: inside the lithium battery protection board, the positive and negative poles of the output are first identified by circuits and programs. After successful identification, power is supplied to the device through relay control, ensuring that the positive and negative poles of external devices can be connected randomly, increasing the safety of the device and improving work efficiency. See Figure 3 , the resistors R1, R2, and R3 constitute a voltage division circuit. According to Ohm's law, if the positive pole of the battery is connected to the R1 side, the voltage at AD1 is higher than that at AD2. If the positive pole of the battery is connected to the R2 side, the voltage at AD2 is higher than that at AD1. By judging the voltage magnitudes at AD1 and AD2, the connection direction of the battery electrodes can be known, and then K1 and K2 are adjusted to make the charging voltage direction match the battery polarity. D1 and D2 constitute an overvoltage protection circuit, and K3 controls the start and stop of charging.

[0051] Figure 4 It is an integration schematic diagram of the equalizing charging device of the present disclosure embodiment. See Figure 4 , Figure 4The intelligent manager therein includes an intelligent photovoltaic controller and an intelligent protection board. Two solar panels can be connected to the intelligent photovoltaic controller separately or in parallel. The intelligent photovoltaic controller is responsible for identifying the polarity of the solar panels and adjusting the load balance of the solar panels. At the same time, the intelligent photovoltaic controller reserves an external solar panel interface, supporting up to 3 solar panels to be connected in parallel for power supply simultaneously. When users connect solar panels, they don't need to care about the polarity of the solar panels, as there is a polarity identification and polarity switching circuit inside the intelligent photovoltaic controller. After the energy of the solar panels is concentrated, it is transmitted to the intelligent protection board. The intelligent protection board is responsible for the charge and discharge management of the battery pack. Each battery unit is connected to the intelligent protection board by a circuit, so overcharging and over-discharging of each battery unit can be avoided.

[0052] The intelligent photovoltaic controller has three groups of solar panel power input ports and one group of power output ports. The power output port is connected to the power input port of the intelligent protection board, and at the same time, a set of terminals is led out of the casing for an external charger to charge the battery. The intelligent protection board has one power output port, one battery charge and discharge interface, and three battery charge and discharge interfaces. Among them, the power output interface is connected outside the casing for other devices to use.

[0053] The multi-channel photovoltaic equalization charging device provided by the embodiments of the present disclosure replaces the existing power supply mode of the acquisition device, can utilize the existing photovoltaic panel resources to perform intelligent equalization charging on the battery of the acquisition device with two photovoltaic panels, can reduce the battery replacement frequency, and safely solves the problem of insufficient battery power supply during rainy season construction, achieving the purpose of "cost reduction and efficiency improvement".

[0054] See Figure 5 , the embodiments of the present disclosure provide a multi-channel photovoltaic equalization charging method, and the method includes the following steps:

[0055] S11, boosting the voltage of multiple photovoltaic panels by using a boost circuit until the photovoltaic panels reach a preset output voltage;

[0056] S12, connecting multiple photovoltaic panels that reach the preset output voltage in parallel and connecting them to a controller;

[0057] S13, using the controller to reduce the voltage to within a preset safe voltage range and then performing charging.

[0058] Since the output voltage of solar panels is affected by factors such as batch, degree of newness and light reception, the output voltages are different. If two solar panels are directly connected in parallel, it will cause internal power consumption at best, resulting in a decrease in power generation efficiency, and at worst, it will burn out the solar panels. The multi-channel photovoltaic equalization charging method provided by the embodiments of the present disclosure is: first boost the voltage, and then step down the voltage. The method of boosting the voltage first is to equip each solar panel with an independent boost circuit. The boost circuit is expected to have a fast load response characteristic so that after having a stable output voltage, the two solar panels can be connected in parallel. The voltage after parallel connection of the outputs may have exceeded the rated voltage of the electrical instrument, so the voltage also needs to be reduced to a reasonable voltage range for use.

[0059] See Figure 6 , a specific embodiment of the multi-channel photovoltaic equalization charging method provided by the embodiments of the present disclosure is:

[0060] After power-on, the embedded software first reads the preset output voltage from the flash memory, and then reads the output voltages of two solar panels. If the output of the solar panel is abnormal, the program will read the output voltage of the solar panel again until the voltage output of the solar panel is normal. Then, the output of the charging voltage will be adjusted by adjusting the duty cycle. After the charging voltage is output, it is also necessary to detect whether the output of the load voltage is normal to achieve dynamic adjustment. If the user changes the output voltage during the process, the parameters will be saved first, and then enter the next loop process. If there is no change, it will directly enter the next loop process.

[0061] The multi-channel photovoltaic equalization charging method provided by the embodiments of the present disclosure can be externally connected to multiple photovoltaic panels to charge the energy storage battery with a larger current. In this way, it can ensure that the energy storage battery is quickly fully charged, reduce the frequency of battery replacement, thereby improving production efficiency and reducing labor intensity. At the same time, it can also solve the problem of incompatibility due to differences in the power generation efficiency of different models and old and new photovoltaic panels, and can make full use of idle photovoltaic panels to achieve the purpose of "repairing the old and making the waste useful, tapping potential and increasing efficiency". The multi-channel photovoltaic equalization charging method provided by the embodiments of the present disclosure can also be applied to commercial photovoltaic lithium battery systems. It will fully guarantee the production efficiency and benefits of the company, and also consolidate the company's leading level in the research and application fields of new technologies and new equipment.

[0062] It should be noted that in this document, 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, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising said element.

[0063] The above are only specific embodiments of the present disclosure, enabling those skilled in the art to understand or implement the present disclosure. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A multi-channel photovoltaic equalizing charging device, characterized in that, the device includes: multiple photovoltaic panels, MOS transistors and a controller. The photovoltaic panels are all connected to the MOS transistors, the MOS transistors are connected to the controller, and a boost circuit is provided between the photovoltaic panels and the MOS transistors.

2. The multi-channel photovoltaic equalizing charging device according to claim 1, characterized in that, the boost circuit includes an input switch and an output filter circuit. The input switch is connected to the photovoltaic panel, and a filter capacitor, a core boost circuit and a voltage output regulating circuit are sequentially provided between the input switch and the output filter circuit.

3. The multi-channel photovoltaic equalizing charging device according to claim 2, characterized in that, three filter capacitors are provided between the input switch and the output filter circuit.

4. The multi-channel photovoltaic equalizing charging device according to claim 2, characterized in that, the core boost circuit includes a power supply, an inductor and a diode.

5. The multi-channel photovoltaic equalizing charging device according to claim 2, characterized in that, the voltage output regulating circuit includes multiple resistors.

6. The multi-channel photovoltaic equalizing charging device according to claim 1, characterized in that, the controller includes a voltage dividing circuit and a switching circuit, and the voltage dividing circuit is connected to the switching circuit.

7. The multi-channel photovoltaic equalizing charging device according to claim 1, characterized in that, the controller includes multiple power input ports and a group of power output ports.

8. The multi-channel photovoltaic equalizing charging device according to claim 7, characterized in that, the multi-channel photovoltaic equalizing charging device further includes an intelligent protection board, and the power input port of the intelligent protection board is connected to the power output port of the controller.

9. The multi-channel photovoltaic equalizing charging device according to claim 1, characterized in that, the multi-channel photovoltaic equalizing charging device further includes a voltage detection module, and the voltage detection module is respectively connected to the boost circuit and the MOS transistor.

10. A multi-channel photovoltaic equalizing charging method, characterized in that, the method includes: using a boost circuit to boost multiple photovoltaic panels until the photovoltaic panels reach a preset output voltage; connecting multiple photovoltaic panels that reach the preset output voltage in parallel and connecting them to a controller; using the controller to reduce the voltage to within a preset safe voltage range and then performing charging.

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