Power input identification method, power input identification circuit and electronic equipment

Abstract

The invention discloses a power supply input identification method, a power supply input identification circuit and electronic equipment, which are applied to input identification of a power supply conversion circuit, and the power supply input identification method comprises the following steps: obtaining an input voltage of the power supply conversion circuit; obtaining a primary voltage outer loop output value by using a difference value between the input voltage and a disturbance input voltage given value; detecting whether the primary voltage outer loop output value is smaller than the maximum amplitude limiting value or not; if the primary voltage outer loop output value is smaller than the maximum amplitude limiting value, the power conversion circuit is determined as photovoltaic power input; and if the primary voltage outer loop output value is not less than the maximum amplitude limiting value, determining that the power supply conversion circuit is a DC voltage source input. Through the mode, the power supply input identification method intelligently identifies the input type of the power supply conversion circuit by judging whether the primary voltage outer loop output value is smaller than the maximum amplitude limiting value or not, namely judging whether disturbance voltage outer loop output is full or not, so that the control logic is simpler, the operation complexity of a user is reduced, and the reliability of a system is improved.

Description

Technical Field

[0001] This application relates to the field of circuit control technologies, and particularly to a power input recognition method, a power input recognition circuit, and an electronic device. Background Art

[0002] Currently, with the increasing richness of power supply scenarios, power conversion and regulation methods are also becoming more diverse. Especially for power conversion circuits involving different input types, different control modes are usually required. For example, when the power supply input of a power conversion circuit has two different input types, namely photovoltaic input and DC voltage source input, in order to adapt to different input types and control the power conversion circuit, it is necessary to first identify its input type.

[0003] However, related technologies usually identify the input type of a power conversion circuit by monitoring the corresponding program settings of the power conversion circuit. However, this recognition method is not universal and has poor flexibility. In application scenarios without program monitoring, it is impossible to effectively implement input type recognition; or it is controlled by software, and the input voltage change value is judged to determine whether it is DC input or photovoltaic input. However, this software implementation logic is relatively complex and requires a large amount of software resources in the device. Summary of the Invention

[0004] The main technical problem to be solved by this application is to provide a power input recognition method, a power input recognition circuit, and an electronic device, which simplify the control logic and can solve the problems that the power input recognition method in the prior art is not universal, has poor flexibility, and cannot effectively implement input type recognition in application scenarios without program monitoring.

[0005] To solve the above technical problem, a technical solution adopted by this application is: to provide a power input recognition method, which is applied to the input recognition of a power conversion circuit. Among them, the power input recognition method includes: obtaining the input voltage of the power conversion circuit; obtaining the primary voltage outer loop output value by using the difference between the input voltage and the given value of the disturbance input voltage; detecting whether the primary voltage outer loop output value is less than the maximum limit value; if the primary voltage outer loop output value is less than the maximum limit value, determining that the power conversion circuit is a photovoltaic power input; if the primary voltage outer loop output value is not less than the maximum limit value, determining that the power conversion circuit is a DC voltage source input.

[0006] Among them, after the step of determining that the power conversion circuit is a photovoltaic power input, it further includes: adjusting the given value of the disturbance input voltage by using a set disturbance observation control program.

[0007] Before the step of obtaining the input voltage of the power conversion circuit, the following steps are further included: obtaining the no-load input voltage of the power conversion circuit; multiplying the no-load input voltage by a set proportionality coefficient to obtain the initial value of the perturbed output voltage; wherein, the set proportionality coefficient is 0.8 - 1; assigning the given value of the perturbed input voltage to the initial value of the perturbed output voltage.

[0008] After the step of obtaining the output value of the primary voltage outer loop using the input voltage, the following steps are further included: obtaining the output control value of the current loop using the smaller value between the output value of the primary voltage outer loop and the maximum limit value; generating a drive control signal using the output control value of the current loop; sending the drive control signal to the power conversion circuit to trigger it to change the switching state, thereby adjusting the output voltage of the power conversion circuit.

[0009] Before the step of generating a drive control signal using the output control value of the current loop, the following steps are further included: obtaining the output voltage of the power conversion circuit; obtaining the output value of the charging voltage loop using the output voltage; the step of generating a drive control signal using the output control value of the current loop includes: generating a drive control signal using the smaller value between the output control value of the current loop and the output value of the charging voltage loop.

[0010] The step of obtaining the output value of the charging voltage loop using the output voltage includes: performing proportional-integral regulation on the difference between the output voltage and the given value of the power supply output voltage to obtain the output value of the charging voltage loop.

[0011] Before the step of generating a drive control signal using the smaller value between the output control value of the current loop and the output value of the charging voltage loop, the following steps are further included: detecting whether the output control value of the current loop is less than the output value of the charging voltage loop; if the output value of the primary voltage outer loop is less than the maximum limit value and the output control value of the current loop is less than the output value of the charging voltage loop, determining that the power conversion circuit is a photovoltaic power input.

[0012] The power input recognition method includes: if the output value of the primary voltage outer loop is not less than the maximum limit value, and / or the output control value of the current loop is not less than the output value of the charging voltage loop, determining that the power conversion circuit is a DC voltage source input.

[0013] To solve the above technical problems, another technical solution adopted by this application is: providing a power input recognition circuit, wherein, the power input recognition circuit is used to be coupled with the power conversion circuit; wherein, the power input recognition circuit is used to implement control on the power conversion circuit by adopting the power input recognition method described in any one of the above.

[0014] To solve the above technical problems, yet another technical solution adopted by this application is: providing an electronic device, wherein, the electronic device includes a housing and a power input recognition circuit connected to the housing; wherein, the power input recognition circuit is the power input recognition circuit described above.

[0015] The beneficial effects of this application are as follows: Different from the prior art, the power input recognition method provided in this application obtains the input voltage of the power conversion circuit, uses the difference between the input voltage and the given value of the disturbance input voltage to obtain the output value of the primary voltage outer loop, and determines whether the output value of the primary voltage outer loop is less than the maximum limit value, that is, whether the output of the disturbance voltage outer loop is saturated, to intelligently recognize the input type of the power conversion circuit. When the output value of the primary voltage outer loop is less than the maximum limit value, it is determined that the power conversion circuit is powered by a photovoltaic power source. When the output value of the primary voltage outer loop is not less than the maximum limit value, it is determined that the power conversion circuit is powered by a DC voltage source. Thus, the recognition of the input type is combined with the power conversion regulation of the power conversion circuit, making the control logic of the power conversion circuit simpler, reducing the operation complexity of the user, and improving the reliability of the system. Moreover, there is no need to separately design a software algorithm to implement the recognition of the input type, and the software resources occupied are also relatively small. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings, where: Figure 1 is a schematic flowchart of the first implementation manner of the power input recognition method of this application; Figure 2 is a schematic structural diagram of the first implementation manner of the power input recognition circuit and the power conversion circuit of this application; Figure 3 is a schematic diagram of the current / voltage characteristic curve of the photovoltaic power input; Figure 4 is a schematic flowchart of the second implementation manner of the power input recognition method of this application; Figure 5 is a schematic flowchart of the third implementation manner of the power input recognition method of this application; Figure 6 is a schematic flowchart of the fourth implementation manner of the power input recognition method of this application; Figure 7 is a schematic flowchart of the fifth implementation manner of the power input recognition method of this application; Figure 8 is a schematic structural diagram of the second implementation manner of the power input recognition circuit and the power conversion circuit of this application; Figure 9 is Figure 7 a schematic framework diagram of the control logic corresponding to S51 - S510 in Figure 10It is a schematic structural diagram of an embodiment of the electronic device of the present application. Detailed Embodiment

[0017] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0018] The terms "first", "second", and "third" in the present application are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", and "third" may explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined. All directional indications (such as up, down, left, right, front, back...) in the embodiments of the present application are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally further include steps or units not listed, or may optionally further include other steps or units inherent to these processes, methods, products, or devices.

[0019] Referring to "embodiment" herein means that the specific features, structures, or characteristics described in connection with the embodiment may be included in at least one embodiment of the present application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0020] The present application will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0021] Please refer to Figure 1 and Figure 2 wherein, Figure 1 is a schematic flowchart of the first embodiment of the power input recognition method of the present application, Figure 2 is a schematic structural diagram of the first embodiment of the power input recognition circuit of the present application. Specifically, the following steps may be included: S11: Obtain the input voltage of the power conversion circuit.

[0022] It can be understood that the power input recognition method in this embodiment is specifically applied to the switch control of the power conversion circuit 200 as shown in Figure 2 The first power input recognition circuit 100 is used to be coupled to the power conversion circuit 200; wherein, the first power input recognition circuit 100 is used to control the power conversion circuit 200 by using any one of the power input recognition methods described herein.

[0023] It should be noted that the power conversion circuit 200 is specifically one or more of a Buck (step-down) circuit, a boost (step-up) circuit, a bridge conversion circuit, or other forms of circuit topologies, etc., which are any reasonable functional circuits for realizing signal conversions such as AC-DC conversion, current / voltage amplitude adjustment, and waveform frequency adjustment. This embodiment does not limit this.

[0024] The first power input recognition circuit 100 may specifically include a control chip, a DSP (Digital Signal Processing) chip, an MCU (Micro Controller Unit) circuit, a CPU (Central Processing Unit), a single-chip microcomputer, a field programmable gate array, a programmable logic device, discrete gates or transistor logic devices, discrete hardware, or any other reasonable circuit unit with signal processing functions. This application does not limit this.

[0025] In addition, "coupled" in this article refers to including any direct and indirect connection means. Therefore, if it is described in the article that the first circuit is coupled to the second circuit, it means that the first circuit can be directly connected to the second circuit through electrical connection, wireless transmission, optical transmission, or other signal connection means, or indirectly electrically connected or signal-connected to the second circuit through other circuits or connection means.

[0026] Specifically, the first power input recognition circuit 100 obtains the current actual input voltage from the power conversion circuit 200.

[0027] Among them, the first power input recognition circuit 100 can specifically obtain the sampling of the input voltage through a current transformer, a voltage divider, a sampling resistor, or any other reasonable built-in monitoring circuit. This application does not limit this.

[0028] S12: Obtain the primary voltage outer loop output value by using the difference between the input voltage and the given value of the disturbance input voltage.

[0029] The first power input recognition circuit 100 compares the actual input voltage with a preset disturbance input voltage set value to obtain the difference between the two, that is, the error signal, and based on this error signal, uses a control algorithm (such as a proportional integral derivative controller, that is, the disturbance voltage outer loop) to generate a primary voltage outer loop output value. This output value reflects the degree of difference between the current state and the desired state of the power conversion circuit 200.

[0030] S13: Detect whether the primary voltage outer loop output value is less than the maximum limit value.

[0031] It should be noted that when the input type of the power conversion circuit 200 is photovoltaic power input or DC voltage source input, different input types will correspond to different signal characteristics during the signal control process of the first power input recognition circuit 100.

[0032] Among them, due to the strong voltage regulation characteristics of the DC voltage source input, it has an approximately constant voltage output, while the voltage characteristics of the photovoltaic power input are relatively soft; if the input type of the power conversion circuit 200 is DC voltage source input, the disturbance voltage outer loop will quickly tend to positive saturation, that is, the output of the disturbance voltage outer loop, and the primary voltage outer loop output value will reach the preset upper limit; but if the input type is photovoltaic power input, as the output power of the power conversion circuit 200 increases, the input voltage corresponding to the photovoltaic power will decrease towards the maximum power point voltage, and the disturbance voltage outer loop will quickly desaturate, that is, the primary voltage outer loop output value will be lower than the preset upper limit, that is, the maximum limit value.

[0033] It can be seen from this that by detecting whether the disturbance voltage outer loop is saturated, that is, whether the primary voltage outer loop output value is less than the maximum limit value, it can be distinguished whether the current input type of the power conversion circuit 200 is photovoltaic power input or DC voltage source input.

[0034] In addition, the soft voltage characteristic of the photovoltaic power source means that under certain light conditions, the output voltage of the photovoltaic power source is not fixed, but will be adjusted with the change of the load. This characteristic enables the photovoltaic power source to maintain a relatively stable output power when dealing with different load demands.

[0035] In the power electronic control system, the positive saturation of the voltage loop is a key manifestation of the system entering a specific working mode, which is commonly seen in the double-loop control architecture. Among them, when the output of the voltage loop reaches the preset upper limit (such as the limit value of the proportional integral derivative controller or the positive saturation voltage of the operational amplifier), it is called positive saturation. At this time, the voltage loop loses its regulation ability, and the system is completely dominated by the current inner loop. In the constant voltage and current limiting system, when the load current reaches the current limiting threshold, the voltage loop output reaches the limit value due to continuous regulation requirements and enters the saturation state.

[0036] Among them, if the output value of the primary voltage outer loop is less than the maximum limit value, then S14 is executed; if the output value of the primary voltage outer loop is not less than the maximum limit value, then S15 is executed.

[0037] S14: Determine that the power conversion circuit is input by a photovoltaic power source.

[0038] As can be seen from the above analysis, when it is detected that the output value of the primary voltage outer loop is less than the maximum limit value, it indicates that the disturbance voltage outer loop is not saturated, which conforms to the characteristics of a photovoltaic power source. Therefore, it can be determined that the input of the power conversion circuit 200 is a photovoltaic power source.

[0039] S15: Determine that the power conversion circuit is input by a DC voltage source.

[0040] When it is detected that the output value of the primary voltage outer loop is not less than the maximum limit value, it indicates that the disturbance voltage outer loop is positively saturated, which conforms to the characteristics of a DC voltage source. Therefore, it can be determined that the input of the power conversion circuit 200 is a DC voltage source.

[0041] In the above solution, by detecting whether the output of the disturbance voltage outer loop is saturated, the input type of the power conversion circuit 200 is intelligently identified, so as to effectively combine the identification of the input type into the power conversion regulation of the power conversion circuit 200, making the control logic of the power conversion circuit 200 simpler, reducing the operation complexity of the user, and improving the reliability of the system; and there is no need to design an additional software algorithm to separately implement the identification of the input type, and the occupied software resources are also relatively small.

[0042] By real-time monitoring and analyzing the change of the input voltage, different types of power inputs can be automatically identified, improving the intelligence level of the system. According to the identification result, the system can adopt corresponding control strategies to ensure stable operation under different types of power inputs. For different types of power inputs, the system can adjust its working mode to optimize the overall performance and improve the energy conversion efficiency. By setting a reasonable maximum limit value, equipment damage caused by excessive input voltage can be prevented, improving the safety of the system, not only improving the adaptability and reliability of the system, but also promoting the effective utilization of energy.

[0043] Further, in an embodiment, after the above S14, it may specifically further include: adjusting the disturbance input voltage given value by using a set disturbance observation control program.

[0044] Please refer to Figure 3 , Figure 3 which is a schematic diagram of the current / voltage characteristic curve of the photovoltaic power source input.

[0045] It should be noted that a photovoltaic power source, such as a PV (Photovoltaic Module) charging module, is the core component of a solar power generation system. It is mainly used to efficiently convert the direct current generated by photovoltaic panels into electrical energy required by energy storage batteries or loads, and to implement key functions such as MPPT (Maximum Power Point Tracking) and energy scheduling.

[0046] MPPT is a technology for dynamically adjusting the output load of an energy source, aiming to make non-linear power sources such as photovoltaic and wind power always operate at the maximum power point, thereby improving the energy conversion efficiency. Its core principle is based on the following two points: ‌I (Current)-V (Voltage) / P (Power)-V Curve Characteristics‌: The output power of a photovoltaic module changes non-linearly with voltage and current, and the maximum power point is located at the peak of the P-V curve.

[0047] ‌Dynamic Tracking Mechanism‌: When external conditions (such as light intensity, temperature, occlusion, etc.) change, MPPT adjusts the equivalent load impedance to make the system always approach the new maximum power point.

[0048] ‌I-V / P-V Curve Matching‌: By real-time sampling the voltage and current of a photovoltaic array, calculating the current power value, and comparing it with historical data, the power change direction is determined.

[0049] ‌Duty Cycle Regulation‌: In a DC-DC converter, by changing the duty cycle of the power switching device, the output voltage and current are adjusted, which is equivalent to changing the load impedance, and finally the maximum power point is locked.

[0050] ‌Closed-loop Control‌: The system forms a closed loop of "sampling - calculation - adjustment" to continuously optimize the working state.

[0051] It can be seen from this that when it is determined that the power conversion circuit is the input of a photovoltaic power source, it is also necessary to adopt a set disturbance observation control program, that is, the MPPT control mode adjusts the given value of the disturbance input voltage to meet the corresponding power supply requirements.

[0052] Please refer to Figure 4 , Figure 4 which is a schematic flowchart of the second implementation manner of the power input recognition method of the present application. The power input recognition method of this implementation manner is Figure 1 a schematic flowchart of a refined implementation manner of the power input recognition method in , specifically including the following steps: S21: Obtain the no-load input voltage of the power conversion circuit.

[0053] It is understandable that when the first power input recognition circuit 100 and / or the power conversion circuit 200 is powered on, or when the power conversion circuit 200 is unloaded, in order to avoid the influence of previous signal control on the current operation of the first power input recognition circuit 100, it is necessary to first initialize the first power input recognition circuit 100, that is, to initially set the given value of the disturbance input voltage.

[0054] Specifically, the first power input recognition circuit 100 obtains the no-load input voltage when it is unloaded or starts up from the power conversion circuit 200.

[0055] S22: Multiply the no-load input voltage by a set proportionality coefficient to obtain the initial value of the disturbance output voltage.

[0056] According to specific application requirements and empirical data, select a suitable set proportionality coefficient so that multiplying the no-load input voltage by this set proportionality coefficient can obtain the initial value of the disturbance output voltage.

[0057] Among them, when selecting this set proportionality coefficient, it is necessary to consider the maximum power point voltage of the photovoltaic power source, the strength characteristics of the DC voltage source, and the line impedance. This set proportionality coefficient is 0.8 - 1, and preferably 0.9. This application does not make any limitations in this regard.

[0058] S23: Assign the given value of the disturbance input voltage to the initial value of the disturbance output voltage.

[0059] Furthermore, assign the calculated initial value of the disturbance output voltage to the given value of the disturbance input voltage to provide a reasonable starting point for subsequent control loops, so that the system can have a working state close to the expected value when starting up.

[0060] By setting the given value of the disturbance input voltage based on the no-load input voltage and multiplying it by an appropriate proportionality coefficient, it can ensure that the system has a reasonable starting point when starting up, avoiding excessive initial errors. A reasonable initial value helps to reduce the fluctuations when the system starts up, improving the stability and response speed of the system. The selection of the set proportionality coefficient can be adjusted flexibly according to the actual situation, enabling the system to better adapt to different working environments and requirements. After providing a good starting point, the subsequent disturbance observation control program can perform fine-tuning more effectively to further optimize the system performance.

[0061] S24: Obtain the input voltage of the power conversion circuit.

[0062] S25: Use the difference between the input voltage and the given value of the disturbance input voltage to obtain the output value of the primary voltage outer loop.

[0063] S26: Detect whether the output value of the primary voltage outer loop is less than the maximum limit value.

[0064] S27: Determine that the power conversion circuit has a photovoltaic power input.

[0065] S28: Determine that the power conversion circuit has a DC voltage source input.

[0066] Among them, S24, S25, S26, S27, and S28 are the same as Figure 1 S11, S12, S13, S14, and S15 in. For specific details, please refer to S11, S12, S13, S14, and S15 and their related text descriptions, which will not be elaborated here.

[0067] Please refer to Figure 5 , Figure 5 is a schematic flowchart of the third implementation manner of the power input recognition method of this application. The power input recognition method of this implementation manner is Figure 1 a schematic flowchart of a refined implementation manner of the power input recognition method in, and specifically includes the following steps: S31: Obtain the input voltage of the power conversion circuit.

[0068] S32: Use the difference between the input voltage and the given value of the disturbance input voltage to obtain the output value of the primary voltage outer loop.

[0069] Among them, S31 and S32 are the same as Figure 1 S11 and S12 in. For specific details, please refer to S11 and S12 and their related text descriptions, which will not be elaborated here.

[0070] S33: Detect whether the output value of the primary voltage outer loop is less than the maximum limit value.

[0071] It can be understood that by detecting whether the disturbance voltage outer loop is saturated, that is, whether the output value of the primary voltage outer loop is less than the maximum limit value, it can be distinguished whether the current input type of the power conversion circuit 200 is a photovoltaic power input or a DC voltage source input.

[0072] Among them, if the output value of the primary voltage outer loop is less than the maximum limit value, then execute S34; if the output value of the primary voltage outer loop is not less than the maximum limit value, then execute S35.

[0073] S34: Adjust the given value of the disturbance input voltage by using the set disturbance observation control program.

[0074] When it is detected that the output value of the primary voltage outer loop is less than the maximum limit value, it is determined that the power conversion circuit 200 has a photovoltaic power input, and the set disturbance observation control program, that is, the MPPT control mode, is used to adjust the given value of the disturbance input voltage for subsequent adjustment and control.

[0075] S35: Use the smaller value of the output value of the primary voltage outer loop and the maximum limit value to obtain the output control value of the current loop.

[0076] The first power input recognition circuit 100 compares the output value of the primary voltage outer loop with the maximum limit value, and selects the smaller value among them to further generate the output control value of the current loop.

[0077] S36: Generate a drive control signal using the output control value of the current loop.

[0078] Adopt a current loop controller, such as a PID (Proportion Integration Differentiation) controller, calculate an appropriate current reference value according to the output control value of the current loop, and generate a corresponding drive control signal based on the current reference value. Among them, this current reference value is the desired current level of the system, which is used to drive the switching element in the power conversion circuit 200.

[0079] It should be noted that the drive control signal can specifically be one or more of any reasonable control signals such as a PWM (Pulse Width Modulation) signal or a PFM (Pulse Frequency Modulation) signal, and the present application does not limit this.

[0080] S37: Send the drive control signal to the power conversion circuit to trigger it to change the switching state, thereby adjusting the output voltage of the power conversion circuit.

[0081] Send the generated drive control signal to the relevant components in the power conversion circuit 200. This is usually achieved through a dedicated drive circuit to ensure that the signal can be accurately transmitted to the switching element.

[0082] After receiving the drive control signal, the switching element in the power conversion circuit 200 will change its switching state (i.e., on or off) according to the indication of the drive control signal, thereby adjusting the energy flow path in the circuit.

[0083] By precisely controlling the state change of the switching element, the output voltage of the power conversion circuit 200 can be effectively adjusted to reach the expected target value. This adjustment process is part of a closed-loop control system and can be dynamically adjusted according to the difference between the actual output voltage and the target voltage. By setting the maximum limit value and selecting a smaller value as the current loop output control value, the system can be effectively protected from being damaged by excessive control signals, improving the system's safety. Using the method of combining the primary voltage outer loop output value and the maximum limit value ensures the stability and reliability of the system under various working conditions. The current loop controller can fine-tune the system according to real-time feedback information, enabling the power conversion circuit 200 to maintain high energy conversion efficiency under different load conditions. This method is applicable to various types of power conversion circuits 200. Whether it is a photovoltaic power source or a DC voltage source, specific application requirements can be met by appropriately adjusting the parameters. It not only improves the intelligent level of the system but also promotes the effective utilization of energy, helping to enhance the market competitiveness of the product. Through this meticulous control strategy, the system can operate efficiently and stably in various complex working environments.

[0084] Please refer to Figure 6 , Figure 6 FIG. is a schematic flowchart of the fourth embodiment of the power input recognition method of the present application. The power input recognition method of this embodiment is Figure 4 a schematic flowchart of a refined embodiment of the power input recognition method in S41: Obtain the input voltage of the power conversion circuit.

[0085] S42: Obtain the primary voltage outer loop output value by using the difference between the input voltage and the given value of the disturbance input voltage.

[0086] S43: Detect whether the primary voltage outer loop output value is less than the maximum limit value.

[0087] S44: Adjust the given value of the disturbance input voltage by using the set disturbance observation control program.

[0088] S45: Obtain the current loop output control value by using the smaller value between the primary voltage outer loop output value and the maximum limit value.

[0089] Among them, S41, S42, S43, S44, and S45 are the same as Figure 4 S31, S32, S33, S34, and S35 in

[0090] S46: Obtain the output voltage of the power conversion circuit.

[0091] Specifically, the first power input recognition circuit 100 obtains the current actual output voltage from the power conversion circuit 200.

[0092] Among them, the first power input recognition circuit 100 can specifically implement the sampling acquisition of the output voltage through a current transformer, a voltage divider, a sampling resistor, or any other reasonable built-in monitoring circuit, and the present application does not limit this.

[0093] S47: Obtain the output value of the charging voltage loop using the output voltage.

[0094] Compare the actual output voltage with the preset target voltage to obtain the difference between the two, that is, the error signal. Based on this error signal, use a control algorithm to generate the output value of the charging voltage loop.

[0095] S48: Generate a drive control signal using the smaller value of the current loop output control value and the charging voltage loop output value.

[0096] Compare the current loop output control value and the charging voltage loop output value, and select the smaller value to generate the corresponding drive control signal.

[0097] S49: Send the drive control signal to the power conversion circuit to trigger it to change the switch state, thereby adjusting the output voltage of the power conversion circuit.

[0098] Among them, S49 is the same as Figure 4 S37 in, and for specific details, please refer to S37 and its related text description, which will not be elaborated here.

[0099] Furthermore, in an embodiment, the above S47 may specifically further include: performing proportional-integral regulation on the difference between the output voltage and the given value of the power supply output voltage to obtain the output value of the charging voltage loop.

[0100] Specifically, compare the actual output voltage with the given value of the power supply output voltage to obtain the difference between the two, that is, the error signal. Based on this error signal, use proportional-integral regulation to generate the output value of the charging voltage loop.

[0101] Please refer to Figure 7 , Figure 7 is a schematic flowchart of the fifth implementation manner of the power input recognition method of the present application. The power input recognition method of this implementation manner is Figure 6 a schematic flowchart of a refined implementation manner of the power input recognition method in, and specifically includes the following steps: S51: Obtain the input voltage of the power conversion circuit.

[0102] It can be understood that the power input recognition method in this implementation manner may specifically be as Figure 8The input recognition implemented by the second power input recognition circuit 300 shown for the power conversion circuit 200.

[0103] For ease of understanding, please continue to refer to Figure 8 , Figure 8 which is a schematic structural diagram of the second implementation manner of the power input recognition circuit of the present application.

[0104] In some embodiments, the power conversion circuit 200 includes a first capacitor C1, a second capacitor C2, a first switching tube Q1, a second switching tube Q2, and an inductor L; wherein, the first end of the first capacitor C1 is coupled to the first end of the first switching tube Q1 and is used to be coupled to the first end of the power input circuit 401, the second end of the first switching tube Q1 is coupled to the first end of the second switching tube Q2 and the first end of the inductor L, the second end of the inductor L is coupled to the first end of the second capacitor C2 and is used to be coupled to the first end of the backend signal circuit 402, the second end of the first capacitor C1 is coupled to the second end of the second switching tube Q2, and the second end of the second capacitor C2 is coupled and is used to be coupled to the second end of the power input circuit 401 and the second end of the backend signal circuit 402, and the third ends of the first switching tube Q1 and the second switching tube Q2 are coupled to the second power input recognition circuit 300.

[0105] In some embodiments, the power input circuit 401 may specifically be a photovoltaic charging module to provide photovoltaic input, or a DC voltage source to provide DC constant voltage input, and the second power input recognition circuit 300 is used to recognize the specific input type of the power input circuit 401. The backend signal circuit 402 may specifically be a rechargeable battery, a DC charging pile, an energy storage component, or any other reasonable load circuit or a circuit unit for implementing a specific signal function, and the present application does not limit this.

[0106] In some embodiments, the first switching tube Q1 and the second switching tube Q2 may specifically be one of MOSFET (Metal Oxide Semiconductor Field Effect Transistor), a triode, a thin film transistor, a field effect transistor, or any other reasonable switching tube, and the present application does not limit this.

[0107] It should be noted that, to distinguish the two ends of each of the above switching tubes other than the control end, one pole is referred to as the first end and the other pole is referred to as the second end. When each switching tube is a triode, the control end, that is, the third end, may specifically be the base, and the first end is the collector and the second end is the emitter; or, the third end may specifically still be the base, and the first end is the emitter and the second end is the collector.

[0108] When each of the above-mentioned switching transistors is a MOSFET, a thin-film transistor, or a field-effect transistor, the third terminal may specifically be a gate, the first terminal a drain, and the second terminal a source; alternatively, the third terminal may specifically also be a gate, the first terminal a source, and the second terminal a drain.

[0109] Among them, when each of the switching transistors is a MOSFET, a thin-film transistor, or a field-effect transistor, it may specifically also be a composite transistor or a single transistor, and the present application does not limit this.

[0110] It should be noted that in other embodiments, the power conversion circuit 200 may specifically also be a boost (step-up) circuit, a bridge conversion circuit, or other forms of circuit topologies, etc., any reasonable functional circuit for realizing signal conversion such as AC-DC conversion, current / voltage amplitude adjustment, waveform frequency adjustment, etc. And the second power input identification circuit 300 may specifically further include a sampling sub-circuit, an analog-to-digital conversion sub-circuit, a filtering sub-circuit, a drive control sub-circuit, etc., any reasonable sub-circuit unit for realizing more refined signal functions, and the present application does not limit this.

[0111] Please continue to refer to Figure 9 , Figure 9 which is Figure 7 a schematic framework diagram of the control logic corresponding to S51 - S510 in

[0112] Among them, the power conversion circuit 200 is used to receive the input voltage Uin and input current Iin provided by the power input circuit 401, and receive the drive control signal PWM sent by the second power input identification circuit 300, so as to change the switching state under the action of the drive control signal PWM, and convert and adjust the input voltage Uin and input current Iin to obtain the output current Io and output voltage Vo, and provide them to the backend signal circuit 402.

[0113] Specifically, the second power input identification circuit 300 obtains the actual input voltage Uin currently provided by the power input circuit 401 to the power conversion circuit 200 from the power conversion circuit 200.

[0114] S52: Obtain the primary voltage outer loop output value by using the difference between the input voltage and the given value of the perturbed input voltage.

[0115] The second power input identification circuit 300 compares the actual input voltage Uin, that is, the input sampling voltage V pv with the given value V pvmppt of the perturbed input voltage preset by the MPPT perturbation control program, obtains the difference between the two, that is, the error signal V pvErr , and based on this error signal V pvErr, using a control algorithm, such as a proportional-integral-derivative controller, that is, a disturbance voltage outer loop, and adopting a transfer function to generate the output value I of the primary voltage outer loop refpv ; where a proportional link, an integral link. The output value I of the primary voltage outer loop refpv reflects the degree of difference between the current state and the desired state of the power conversion circuit 200.

[0116] S53: Obtain the output control value of the current loop by using the smaller value between the output value of the primary voltage outer loop and the maximum limit value.

[0117] The second power input identification circuit 300 further compares the output value I of the primary voltage outer loop refpv and the maximum limit value I refSet , and selects the smaller value as the set value Ibat of the backend sampling current setchg , so as to compare the set value Ibat of the backend sampling current setchg with the backend sampling current Ibat, that is, the output current Io, to obtain the difference between the two, that is, the current error signal Ibat chgerr , and based on the current error signal Ibat chgerr , use a control algorithm (such as a proportional-integral-derivative controller, that is, a current loop) to generate the output control value Ichg of the current loop PIout .

[0118] S54: Obtain the output voltage of the power conversion circuit.

[0119] Specifically, the second power input identification circuit 300 obtains the current actual output voltage Vo from the power conversion circuit 200, that is, the backend sampling voltage Vbat.

[0120] S55: Obtain the output value of the charging voltage loop by using the output voltage.

[0121] Compare the actual output voltage Vo, that is, the backend sampling voltage Vbat with the preset target voltage Vbat setchg to obtain the difference between the two, that is, the voltage error signal Vbat chgerr , and based on the voltage error signal Vbat chgerr , use a control algorithm to generate the output value Vchg of the charging voltage loop PIout .

[0122] S56: Detect whether the output value of the primary voltage outer loop is less than the maximum limit value.

[0123] It can be understood that by detecting whether the disturbance voltage outer loop is saturated, that is, whether the output value I of the primary voltage outer loop refpv is less than the maximum limit value IrefSet It can be determined whether the current input type of the power conversion circuit 200 is photovoltaic power input or DC voltage source input.

[0124] Among them, if the output value I of the primary voltage outer loop refpv is less than the maximum limit value I refSet , then execute S57. If the output value I of the primary voltage outer loop refpv is not less than the maximum limit value I refSet , then execute S59.

[0125] S57: Detect whether the output control value of the current loop is less than the output value of the charging voltage loop.

[0126] Furthermore, detect and confirm whether the output control value Ichg of the current loop PIout is less than the output value Vchg of the charging voltage loop PIout .

[0127] Among them, if the output control value Ichg of the current loop PIout is less than the output value Vchg of the charging voltage loop PIout , then execute S58. If the output control value Ichg of the current loop PIout is not less than the output value Vchg of the charging voltage loop PIout , then execute S59.

[0128] S58: Adjust the given value of the disturbance input voltage by using the set disturbance observation control program.

[0129] When it is detected that the output value I of the primary voltage outer loop refpv is less than the maximum limit value I refSet , it is determined that the power conversion circuit 200 is photovoltaic power input, and the set disturbance observation control program, that is, the MPPT control mode, is used to adjust the given value V of the disturbance input voltage pvmppt for subsequent adjustment control.

[0130] S59: Generate a drive control signal by using the smaller value between the output control value of the current loop and the output value of the charging voltage loop.

[0131] The second power input identification circuit 300 further compares the output control value Ichg of the current loop PIout and the output value Vchg of the charging voltage loop PIout , and selects the smaller value to generate the corresponding drive control signal PWM. Among them, the drive control signal PWM may specifically include a first drive signal PWM1 and a second drive signal PWM2.

[0132] S510: Send the drive control signal to the power conversion circuit to trigger it to change the switch state, thereby adjusting the output voltage of the power conversion circuit.

[0133] The second power input recognition circuit 300 sends the generated first driving signal PWM1 and second driving signal PWM2 to the first switching transistor Q1 and the second switching transistor Q2 in the power conversion circuit 200 respectively, so as to trigger the first switching transistor Q1 and the second switching transistor Q2 to conduct or turn off respectively, thereby adjusting the energy flow path in the power conversion circuit 200 to adjust the output voltage Vo.

[0134] This application also provides an electronic device. Please refer to Figure 10 , Figure 10 FIG. is a schematic structural diagram of an embodiment of the electronic device of this application. In this embodiment, the electronic device 60 includes a housing 61 and a third power input recognition circuit 62 connected to the housing 61.

[0135] It should be noted that the third power input recognition circuit 62 described in this embodiment is the first power input recognition circuit 100 or the second power input recognition circuit 300 described in any of the above embodiments. For details, please refer to Figures 1-9 and the relevant text content, which will not be elaborated here.

[0136] The beneficial effects of this application are as follows: Different from the prior art, the power input recognition method provided by this application obtains the input voltage of the power conversion circuit, uses the difference between the input voltage and the given value of the disturbance input voltage to obtain the output value of the primary voltage outer loop, and determines whether the output value of the primary voltage outer loop is less than the maximum limit value, that is, whether the disturbance voltage outer loop output is saturated, to intelligently identify the input type of the power conversion circuit. When the output value of the primary voltage outer loop is less than the maximum limit value, it is determined that the power conversion circuit is a photovoltaic power input; when the output value of the primary voltage outer loop is not less than the maximum limit value, it is determined that the power conversion circuit is a DC voltage source input. Thus, the recognition of the input type is combined with the power conversion adjustment of the power conversion circuit, making the control logic of the power conversion circuit simpler, reducing the operation complexity of users, and improving the reliability of the system; moreover, there is no need to design a separate software algorithm to implement the recognition of the input type, and the software resources occupied are also relatively small.

[0137] The above are only the embodiments of this application, and do not limit the patent scope of this application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of this application, or directly or indirectly applied to other related technical fields, shall be included in the patent protection scope of this application by the same token.

Claims

1. A power input recognition method, which is applied to the input recognition of a power conversion circuit, and is characterized in that The power input recognition method includes: Obtaining the input voltage of the power conversion circuit; Obtaining the output value of the primary voltage outer loop by using the difference between the input voltage and the given value of the perturbed input voltage; Detecting whether the output value of the primary voltage outer loop is less than the maximum limit value; If the output value of the primary voltage outer loop is less than the maximum limit value, determining that the power conversion circuit is a photovoltaic power input; If the output value of the primary voltage outer loop is not less than the maximum limit value, determining that the power conversion circuit is a DC voltage source input.

2. The power input recognition method according to claim 1, wherein After the step of determining that the power conversion circuit is a photovoltaic power input, it further includes: Adjusting the given value of the perturbed input voltage by using a set perturbation observation control program.

3. The power input recognition method according to claim 1, wherein Before the step of obtaining the input voltage of the power conversion circuit, it further includes: Obtaining the no-load input voltage of the power conversion circuit; Multiplying the no-load input voltage by a set proportionality coefficient to obtain the initial value of the perturbed output voltage; wherein, the set proportionality coefficient is 0.8 - 1; Assigning the given value of the perturbed input voltage to the initial value of the perturbed output voltage.

4. The power input recognition method according to any one of claims 1-3, characterized in that After the step of obtaining the output value of the primary voltage outer loop by using the input voltage, it further includes: Obtaining the output control value of the current loop by using the smaller value between the output value of the primary voltage outer loop and the maximum limit value; Generating a drive control signal by using the output control value of the current loop; Sending the drive control signal to the power conversion circuit to trigger it to change the switch state, thereby adjusting the output voltage of the power conversion circuit.

5. The power input recognition method according to claim 4, wherein Before the step of generating a drive control signal by using the output control value of the current loop, it further includes: Obtaining the output voltage of the power conversion circuit; Obtaining the output value of the charging voltage loop by using the output voltage; The step of generating a drive control signal by using the output control value of the current loop includes: Generating the drive control signal by using the smaller value between the output control value of the current loop and the output value of the charging voltage loop.

6. The power input recognition method according to claim 5, characterized in that, The step of obtaining the output value of the charging voltage loop by using the output voltage includes: Performing proportional-integral regulation on the difference between the output voltage and the given value of the power supply output voltage to obtain the output value of the charging voltage loop.

7. The power input recognition method according to claim 5, characterized in that, Before the step of generating the drive control signal by using the smaller value between the output control value of the current loop and the output value of the charging voltage loop, it further includes: Detecting whether the output control value of the current loop is less than the output value of the charging voltage loop; If the output value of the primary voltage outer loop is less than the maximum limit value and the output control value of the current loop is less than the output value of the charging voltage loop, determining that the power conversion circuit is a photovoltaic power input.

8. The power input recognition method according to claim 7, wherein The power input recognition method includes: If the output value of the primary voltage outer loop is not less than the maximum limit value, and / or the output control value of the current loop is not less than the output value of the charging voltage loop, determining that the power conversion circuit is a DC voltage source input.

9. A power input recognition circuit, characterized in that, The power input recognition circuit is used to be coupled with the power conversion circuit; Wherein, the power input recognition circuit controls the power conversion circuit by using the power input recognition method as described in any one of claims 1 - 8.

10. An electronic device, characterized in that, The electronic device includes a housing and a power input recognition circuit connected to the housing; Wherein, the power input recognition circuit is the power input recognition circuit as described in claim 9.

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