Power input recognition method, power input recognition circuit, and electronic device

Abstract

The application discloses a power input identification method, a power input identification circuit and an electronic device, which are applied to input identification of a power conversion circuit. The power input identification method comprises the following steps: acquiring an input voltage of the power conversion circuit; obtaining a primary voltage outer loop output value by using a difference between the input voltage and a given value of a perturbation input voltage; detecting whether the primary voltage outer loop output value is smaller than a maximum limiting value; if the primary voltage outer loop output value is smaller than the maximum limiting value, determining that the power conversion circuit is a photovoltaic power input; and if the primary voltage outer loop output value is not smaller than the maximum limiting value, determining that the power conversion circuit is a direct-current voltage source input. Through the above method, the power input identification method of the application intelligently identifies the input type of the power conversion circuit by using whether the primary voltage outer loop output value is smaller than the maximum limiting value, i.e. whether the perturbation voltage outer loop output is saturated, so that the control logic is simpler, the operation complexity of a user is reduced, and the reliability of the system is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit control, in particular to a power input identification method, a power input identification circuit and an electronic device. BACKGROUND

[0002] Nowadays, with the increasing richness of power supply scenarios, the power conversion and regulation modes are also increasingly diverse, especially involving power conversion circuits of different input types, which usually need to use different control modes. For example, when the power supply input of the power conversion circuit has two different input types, photovoltaic input and direct current voltage source input, in order to adapt to the control of the power conversion circuit for different input types, it is necessary to first identify the input type.

[0003] However, the related art usually identifies the input type of the power conversion circuit by monitoring the corresponding program settings of the power conversion circuit, but this identification method is not universal and has poor flexibility, and in the application scenario without program monitoring, it cannot effectively identify the input type. Or controlled by software, determine whether it is a direct current input or a photovoltaic input by judging the input voltage change value, but this software implementation logic is relatively complex and requires a large amount of software resources in the device. SUMMARY

[0004] The technical problem solved by the present application is to provide a power input identification method, a power input identification circuit and an electronic device, which simplifies the control logic and solves the problem of the non-universal and poor flexibility of the power input identification method in the prior art, which cannot effectively identify the input type in the application scenario without program monitoring.

[0005] To solve the above technical problems, one technical solution adopted by the present application is to provide a power input identification method applied to the input identification of a power conversion circuit, wherein the power input identification method comprises: obtaining an input voltage of the power conversion circuit; obtaining a primary voltage outer loop output value by using the difference between the input voltage and a given value of a perturbation input voltage; detecting whether the primary voltage outer loop output value is less than a maximum limiting value; if the primary voltage outer loop output value is less than the maximum limiting value, determining that the power conversion circuit is a photovoltaic power input; and if the primary voltage outer loop output value is not less than the maximum limiting value, determining that the power conversion circuit is a direct current voltage source input.

[0006] The step of determining that the power conversion circuit is a photovoltaic power input further comprises adjusting the given value of the perturbation input voltage using a set perturbation observation control program.

[0007] The step of obtaining the input voltage of the power conversion circuit further comprises: obtaining the no-load input voltage of the power conversion circuit; multiplying the no-load input voltage by a set proportional coefficient to obtain an initial value of the perturbation output voltage; wherein the set proportional coefficient is 0.8-1; and assigning a given value of the perturbation input voltage to the initial value of the perturbation output voltage.

[0008] The step of obtaining the primary voltage outer loop output value from the input voltage further comprises: obtaining a current loop output control value from the smaller one of the primary voltage outer loop output value and the maximum limiting value; generating a driving control signal using the current loop output control value; and sending the driving control signal to the power conversion circuit to trigger the power conversion circuit to change the switching state, so as to adjust the output voltage of the power conversion circuit.

[0009] The step of generating the driving control signal using the current loop output control value further comprises: obtaining an output voltage of the power conversion circuit; obtaining a charging voltage loop output value from the output voltage; and generating the driving control signal using the smaller one of the current loop output control value and the charging voltage loop output value.

[0010] The step of obtaining the charging voltage loop output value from the output voltage comprises: performing proportional integral adjustment on the difference between the output voltage and a given value of the supply output voltage to obtain the charging voltage loop output value.

[0011] The step of generating the driving control signal using the smaller one of the current loop output control value and the charging voltage loop output value further comprises: detecting whether the current loop output control value is smaller than the charging voltage loop output value; and determining that the power conversion circuit is a photovoltaic power input if the primary voltage outer loop output value is smaller than the maximum limiting value and the current loop output control value is smaller than the charging voltage loop output value.

[0012] The power input identification method further comprises: determining that the power conversion circuit is a direct current voltage source input if the primary voltage outer loop output value is not smaller than the maximum limiting value and / or the current loop output control value is not smaller than the charging voltage loop output value.

[0013] To solve the above technical problems, another technical solution adopted by the present application is to provide a power input identification circuit, wherein the power input identification circuit is used to be coupled with a power conversion circuit; and the power input identification circuit is used to control the power conversion circuit by using the power input identification method according to any one of the above.

[0014] To solve the above technical problems, another technical solution adopted by the present application is to provide an electronic device, wherein the electronic device comprises a shell and a power input identification circuit connected to the shell; and the power input identification circuit is the power input identification circuit according to the above.

[0015] The beneficial effects of the present application are: different from the prior art, the power input recognition method provided by the present application obtains the input voltage of the power conversion circuit, obtains the primary voltage outer loop output value by using the difference between the input voltage and the given value of the perturbed input voltage, and intelligently recognizes the input type of the power conversion circuit by detecting whether the primary voltage outer loop output value is less than the maximum limiting value, that is, whether the perturbed voltage outer loop output is saturated, so as to determine that the power conversion circuit is a photovoltaic power input when the primary voltage outer loop output value is less than the maximum limiting value, and determine that the power conversion circuit is a direct current voltage source input when the primary voltage outer loop output value is not less than the maximum limiting value, thereby combining the recognition of the input type into the power conversion adjustment 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; and without additionally designing a software algorithm to separately realize the recognition of the input type, the software resources occupied are also relatively small. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0017] Figure 1 is a flowchart of the first embodiment of the power input recognition method of the present application;

[0018] Figure 2 is a structural schematic diagram of the first embodiment of the power input recognition circuit and the power conversion circuit of the present application;

[0019] Figure 3 is a schematic diagram of the current / voltage characteristic curve of the photovoltaic power input;

[0020] Figure 4 is a flowchart of the second embodiment of the power input recognition method of the present application;

[0021] Figure 5 is a flowchart of the third embodiment of the power input recognition method of the present application;

[0022] Figure 6 is a flowchart of the fourth embodiment of the power input recognition method of the present application;

[0023] Figure 7 is a flowchart of the fifth embodiment of the power input recognition method of the present application;

[0024] Figure 8Fig. 2 is a structural schematic diagram of a power input identification circuit and a power conversion circuit according to a second embodiment of the present application;

[0025] Figure 9 Fig. 1 is a structural schematic diagram of an electronic device according to an embodiment of the present application. Figure 7 Fig. 5 is a block schematic diagram of control logic corresponding to S51-S510 in Fig. 4.

[0026] Figure 10 Fig. 1 is a structural schematic diagram of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0028] The terms "first", "second", "third" in the present application are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second", "third" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly and specifically limited. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly. In addition, the terms "include" and "have" 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 can optionally include steps or units not listed, or can optionally include other steps or units inherent to the process, method, product or device.

[0029] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily mutually exclusive of other embodiments. It is explicitly and implicitly understood that the embodiments described herein can be combined with other embodiments.

[0030] The present application will be described in detail in conjunction with the accompanying drawings and embodiments. The technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0031] Please refer to Figure 1 and Figure 2 wherein, Figure 1 is the flowchart of the first embodiment of the power input identification method of the present application, Figure 2 is the structural schematic diagram of the first embodiment of the power input identification circuit of the present application. Specifically, it can include the following steps:

[0032] S11: Obtain the input voltage of the power conversion circuit.

[0033] It can be understood that the power input identification method in the present embodiment is specifically applied to the switch control of the power conversion circuit 200 as shown in the figure. The first power input identification circuit 100 is used to be coupled with the power conversion circuit 200; wherein the first power input identification circuit 100 is used to control the power conversion circuit 200 by using any power input identification method in the present application. Figure 2

[0034] It is worth mentioning that the power conversion circuit 200 is specifically one or more of Buck (buck) circuit, boost (boost) circuit, bridge conversion circuit, or other forms of circuit topology, etc. Any reasonable function circuit for realizing AC / DC conversion, current / voltage amplitude adjustment, waveform frequency adjustment, etc. Signal conversion, which is not limited in the present embodiment.

[0035] The first power input identification circuit 100 can specifically include one of any reasonable circuit unit with signal processing function, such as control chip, DSP (Digital Signal Processing) chip, MCU (Micro Controller Unit) circuit, CPU (Central Processing Unit), single-chip microcomputer, field programmable gate array, programmable logic device, discrete gate or transistor logic device, discrete hardware, etc. The present application does not limit this.

[0036] In addition, "coupling" in the present application refers to any direct and indirect connection means. Therefore, if the first circuit is described as being coupled to the second circuit, it means that the first circuit can be directly connected to the second circuit through electrical connection or wireless transmission, optical transmission, etc. Signal connection mode, or indirectly connected to the second circuit through other circuits or connection means.

[0037] Specifically, the first power input identification circuit 100 obtains the current actual input voltage from the power conversion circuit 200.

[0038] ​The first power input identification circuit 100 can specifically achieve sampling of the input 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.

[0039] S12: obtaining a primary voltage outer loop output value by using the difference between the input voltage and the given value of the perturbed input voltage.

[0040] The first power input identification circuit 100 compares the actual input voltage with the pre-set given value of the perturbed input voltage, obtains the difference between the two, i.e. an error signal, and based on the error signal, uses a control algorithm (such as a proportional-integral-derivative controller, i.e. a perturbed voltage outer loop) to generate a primary voltage outer loop output value. The output value reflects the difference between the current state and the desired state of the power conversion circuit 200.

[0041] S13: detecting whether the primary voltage outer loop output value is less than the maximum limiting value.

[0042] It is worth noting that when the input type of the power conversion circuit 200 is a photovoltaic power input or a direct current voltage source input, different input types will correspond to different signal characteristics in the signal control process of the first power input identification circuit 100.

[0043] Among them, since the voltage stabilization characteristic of the direct current voltage source input is relatively strong, it is approximately constant voltage output, while the voltage characteristic of the photovoltaic power input is relatively soft; if the input type of the power conversion circuit 200 is a direct current voltage source input, the perturbed voltage outer loop will quickly tend to be positively saturated, i.e. the output of the perturbed voltage outer loop, the primary voltage outer loop output value will reach the pre-set upper limit; but if the input type is a photovoltaic power input, as the output power of the power conversion circuit 200 increases, the input voltage corresponding to the photovoltaic power will decrease to the maximum power point voltage, the perturbed voltage outer loop will quickly desaturate, i.e. the primary voltage outer loop output value will be lower than the pre-set upper limit, i.e. the maximum limiting value.

[0044] Therefore, by detecting whether the perturbed voltage outer loop is saturated, i.e. whether the primary voltage outer loop output value is less than the maximum limiting value, it can be determined whether the current input type of the power conversion circuit 200 is a photovoltaic power input or a direct current voltage source input.

[0045] In addition, the soft voltage characteristic of the photovoltaic power refers to the fact that under certain light conditions, the output voltage of the photovoltaic power is not fixed but will be adjusted with the change of the load. This characteristic enables the photovoltaic power to maintain relatively stable output power when responding to different load demands.

[0046] In power electronic control systems, the forward saturation of the voltage loop is a key manifestation of the system entering a certain working mode, which is common in double-loop control architecture. When the output of the voltage loop reaches the preset upper limit (such as the limiting value of the proportional-integral-derivative controller or the forward saturation voltage of the operational amplifier), it is called forward saturation, at which point the voltage loop loses its regulation ability and the system is completely dominated by the current inner loop. In constant voltage current limiting systems, when the load current reaches the current limiting threshold, the voltage loop output reaches the limiting value due to the continuous regulation requirement, and enters the saturation state.

[0047] If the primary voltage outer loop output value is less than the maximum limiting value, S14 is executed, and if the primary voltage outer loop output value is not less than the maximum limiting value, S15 is executed.

[0048] S14: Determine that the power conversion circuit is input by a photovoltaic power supply.

[0049] From the above analysis, when it is detected that the primary voltage outer loop output value is less than the maximum limiting value, it indicates that the perturbation voltage outer loop is not saturated, which is consistent with the characteristics of the photovoltaic power supply. Therefore, it can be determined that the input of the power conversion circuit 200 is a photovoltaic power supply.

[0050] S15: Determine that the power conversion circuit is input by a direct current voltage source.

[0051] When it is detected that the primary voltage outer loop output value is not less than the maximum limiting value, it indicates that the perturbation voltage outer loop is forward saturated, which is consistent with the characteristics of the direct current voltage source. Therefore, it can be determined that the input of the power conversion circuit 200 is a direct current voltage source.

[0052] The above scheme intelligently identifies the input type of the power conversion circuit 200 by detecting whether the perturbation voltage outer loop output is saturated, effectively combining 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 without the need to additionally design software algorithms to separately implement the identification of the input type, the software resources occupied are also relatively small.

[0053] By monitoring and analyzing the changes of the input voltage in real time, different types of power input can be automatically identified, improving the intelligent 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 input. For different types of power input, the system can adjust its working mode to optimize overall performance and improve energy conversion efficiency. By setting a reasonable maximum limiting value, damage to the equipment 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 use of energy.

[0054] Further, in an embodiment, after S14, specifically, the method can further include: adjusting the disturbance input voltage given value by using the disturbance observation control program.

[0055] Please refer to Figure 3 , Figure 3 is a schematic diagram of the current / voltage characteristic curve of the photovoltaic power input.

[0056] It is worth noting that photovoltaic power sources, such as PV (Photovoltaic Module) charging modules, are the core components of solar power systems, mainly used to efficiently convert the direct current generated by photovoltaic panels into the power required by energy storage batteries or loads, and to realize key functions such as MPPT (Maximum power point tracking), energy scheduling, etc.

[0057] MPPT is a technology that dynamically adjusts the energy source output load, aiming to make photovoltaic, wind power, and other nonlinear power sources always work at the maximum power point, thereby improving energy conversion efficiency. Its core principle is based on the following two points:

[0058] ‌I (current)-V (voltage) / P (power)-V curve characteristics‌: The output power of photovoltaic components changes nonlinearly with voltage and current, and the maximum power point is located at the peak of the P-V curve.

[0059] ‌Dynamic tracking mechanism‌: When external conditions (such as light intensity, temperature, shading, etc.) change, MPPT adjusts the equivalent load impedance to make the system always approach the new maximum power point.

[0060] ‌I-V / P-V curve matching‌: By real-time sampling of the voltage and current of the photovoltaic array, the current power value is calculated and compared with historical data to determine the power change direction.

[0061] ‌Duty cycle adjustment‌: In a direct-current to direct-current 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 locking the maximum power point.

[0062] ‌Closed-loop control‌: The system forms a "sampling-computing-adjustment" closed loop, continuously optimizing the working state.

[0063] Therefore, when the power conversion circuit is determined to be a photovoltaic power input, a disturbance observation control program, i.e., an MPPT control mode, is used to adjust the disturbance input voltage given value to meet the corresponding power supply requirements.

[0064] Please refer to Figure 4 , Figure 4is a flowchart of a second embodiment of the power input recognition method of the present application. The power input recognition method of the present embodiment is a detailed embodiment of the power input recognition method in Figure 1 , and specifically includes the following steps:

[0065] S21: Obtain the no-load input voltage of the power conversion circuit.

[0066] It can be understood 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 in no-load state, the previous signal control may affect the current operation of the first power input recognition circuit 100. Therefore, it is necessary to first initialize the first power input recognition circuit 100, that is, to initially set the given value of the perturbation input voltage.

[0067] Specifically, the first power input recognition circuit 100 obtains the no-load input voltage of the power conversion circuit 200 when it is in no-load state or powered on.

[0068] S22: Multiply the no-load input voltage by a set proportionality coefficient to obtain the initial value of the perturbation output voltage.

[0069] According to the specific application requirements and experience data, a suitable set proportionality coefficient is selected to multiply the no-load input voltage by the set proportionality coefficient to obtain the initial value of the perturbation output voltage.

[0070] The set proportionality coefficient needs to be selected in combination with the maximum power point voltage of the photovoltaic power source, the strength characteristics of the direct current voltage source, and the line impedance. The set proportionality coefficient is 0.8-1, and is preferably 0.9. The present application does not limit this.

[0071] S23: Assign the given value of the perturbation input voltage to the initial value of the perturbation output voltage.

[0072] Further, the initial value of the perturbation output voltage calculated is assigned to the given value of the perturbation input voltage to provide a reasonable starting point for the subsequent control loop, so that the system can have an expected working state at startup.

[0073] By setting the given value of the perturbation input voltage based on the no-load input voltage and multiplying it by an appropriate proportionality coefficient, a reasonable starting point for the system at startup can be ensured, avoiding excessive initial errors. A reasonable initial value helps to reduce fluctuations at system startup, improving the stability and response speed of the system. The selection of the set proportionality coefficient can be flexibly adjusted according to actual conditions, so that the system can better adapt to different working environments and requirements. After providing a good starting point, the subsequent perturbation observation control program can be more effective in fine-tuning, further optimizing system performance.

[0074] S24: Obtain the input voltage of the power conversion circuit.

[0075] S25: Obtain the primary voltage outer loop output value by using the difference between the input voltage and the given value of the perturbation input voltage.

[0076] S26: Detect whether the primary voltage outer loop output value is less than the maximum limiting value.

[0077] S27: Determine that the power conversion circuit is inputted by the photovoltaic power supply.

[0078] S28: Determine that the power conversion circuit is inputted by the direct current voltage source.

[0079] Wherein, S24, S25, S26, S27 and S28 are the same as S11, S12, S13, S14 and S15 in Figure 1 , please refer to S11, S12, S13, S14 and S15 and the related text description, which will not be repeated here.

[0080] Please refer to Figure 5 , Figure 5 is the flowchart of the third embodiment of the power input identification method of the present application. The power input identification method of the present embodiment is a detailed embodiment of the power input identification method in Figure 1 , specifically comprising the following steps:

[0081] S31: Obtain the input voltage of the power conversion circuit.

[0082] S32: Obtain the primary voltage outer loop output value by using the difference between the input voltage and the given value of the perturbation input voltage.

[0083] Wherein, S31 and S32 are the same as S11 and S12 in Figure 1 , please refer to S11 and S12 and the related text description, which will not be repeated here.

[0084] S33: Detect whether the primary voltage outer loop output value is less than the maximum limiting value.

[0085] It can be understood that by detecting whether the perturbation voltage outer loop is saturated, i.e. whether the primary voltage outer loop output value is less than the maximum limiting value, it can be distinguished whether the current input type of the power conversion circuit 200 is the photovoltaic power supply input or the direct current voltage source input.

[0086] Wherein, if the primary voltage outer loop output value is less than the maximum limiting value, S34 is executed, and if the primary voltage outer loop output value is not less than the maximum limiting value, S35 is executed.

[0087] S34: Adjust the given value of the perturbation input voltage by using the set perturbation observation control program.

[0088] In the case where the primary voltage outer loop output value is detected to be less than the maximum clamping value, it is determined that the power conversion circuit 200 is inputted by a photovoltaic power supply, and a set perturbation observation control program, i.e., an MPPT control mode, is adopted to adjust the perturbation input voltage given value for subsequent adjustment control.

[0089] S35: The current loop output control value is obtained by using the smaller one of the primary voltage outer loop output value and the maximum clamping value.

[0090] The first power supply input recognition circuit 100 compares the primary voltage outer loop output value and the maximum clamping value, and selects the smaller one of them to further generate the current loop output control value.

[0091] S36: The drive control signal is generated by using the current loop output control value.

[0092] The current loop controller, such as a PID (Proportion Integration Differentiation) controller, calculates an appropriate current reference value according to the current loop output control value, and generates a corresponding drive control signal based on the current reference value. The current reference value is the current level expected by the system, which is used to drive the switching elements in the power conversion circuit 200.

[0093] It is worth noting that the drive control signal can be one or more of PWM (Pulse Width Modulation) signal or PFM (Pulse Frequency Modulation) signal, etc., and the present application does not limit it.

[0094] S37: The drive control signal is sent to the power conversion circuit to trigger the change of the switching state, so as to adjust the output voltage of the power conversion circuit.

[0095] The generated drive control signal is sent to the relevant components in the power conversion circuit 200. This is usually realized through a dedicated drive circuit, which ensures that the signal can be accurately transmitted to the switching elements.

[0096] After receiving the drive control signal, the switching elements in the power conversion circuit 200 will change their switching state (i.e., turn on or turn off) according to the indication of the drive control signal, so as to adjust the energy flow path in the circuit.

[0097] By precisely controlling the state changes of the switching elements, the output voltage of the power conversion circuit 200 can be effectively regulated to reach the desired target value. This regulation process is part of a closed-loop control system that dynamically adjusts based on the difference between the actual output voltage and the target voltage. By setting a maximum limit value and selecting a smaller value as the current loop output control value, the system can be effectively protected from damage caused by excessive control signals, improving its safety. The combination of the primary voltage outer loop output value and the maximum limit value ensures the stability and reliability of the system under various operating conditions. The current loop controller can fine-tune the system based on real-time feedback information, allowing the power conversion circuit 200 to maintain high energy conversion efficiency under different load conditions. This method is suitable for various types of power conversion circuits 200, whether photovoltaic power or direct current voltage sources, and can meet specific application requirements by adjusting parameters appropriately. Not only does it improve the intelligence level of the system, but it also promotes the efficient use of energy, helping to enhance the market competitiveness of products. Through this detailed control strategy, the system can maintain efficient and stable operation in various complex working environments.

[0098] Please refer to Figure 6 , Figure 6 is the flowchart of the fourth embodiment of the power input identification method of the present application. The power input identification method of the present embodiment is a detailed implementation of the power input identification method in Figure 4 , and specifically includes the following steps:

[0099] S41: Obtain the input voltage of the power conversion circuit.

[0100] S42: Obtain the primary voltage outer loop output value using the difference between the input voltage and the disturbance input voltage given value.

[0101] S43: Detect whether the primary voltage outer loop output value is less than the maximum limit value.

[0102] S44: Adjust the disturbance input voltage given value using the set disturbance observation control program.

[0103] S45: Obtain the current loop output control value using the smaller value between the primary voltage outer loop output value and the maximum limit value.

[0104] Wherein S41, S42, S43, S44 and S45 are the same as S31, S32, S33, S34 and S35 in Figure 4 , please refer to S31, S32, S33, S34 and S35 and their related text description, which will not be repeated here.

[0105] S46: Obtain the output voltage of the power conversion circuit.

[0106] Specifically, the first power input identification circuit 100 obtains the current actual output voltage from the power conversion circuit 200.

[0107] The first power input identification circuit 100 can specifically obtain the output voltage by a current transformer, a voltage divider, a sampling resistor, or any other reasonable built-in monitoring circuit, which is not limited in the present application.

[0108] S47: Obtain the charging voltage loop output value using the output voltage.

[0109] Compare the actual output voltage with the preset target voltage to obtain the difference between them, i.e., the error signal. Based on the error signal, use a control algorithm to generate the charging voltage loop output value.

[0110] S48: Generate the drive control signal using the smaller value of the current loop output control value and the charging voltage loop output value.

[0111] 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.

[0112] S49: 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.

[0113] S49 is the same as S37 in Figure 4 , and specific reference is made to S37 and its related textual description, which will not be repeated here.

[0114] Further, in an embodiment, S47 can specifically further include: proportionally and integrally adjusting the difference between the output voltage and the power supply output voltage given value to obtain the charging voltage loop output value.

[0115] Specifically, compare the actual output voltage with the power supply output voltage given value to obtain the difference between them, i.e., the error signal. Based on the error signal, use proportional and integral adjustment to generate the charging voltage loop output value.

[0116] Please refer to Figure 7 , Figure 7 is a flowchart of the fifth embodiment of the power input identification method of the present application. The power input identification method of the present embodiment is a detailed embodiment of the power input identification method in Figure 6 , and specifically includes the following steps:

[0117] S51: Obtain the input voltage of the power conversion circuit.

[0118] It can be understood that the power input identification method in the present embodiment can be as shown inFigure 8 The second power input identification circuit 300 is used to identify the input of the power conversion circuit 200.

[0119] For the convenience of understanding, please continue to refer to Figure 8 , Figure 8 is a structural schematic diagram of the second embodiment of the power input identification circuit of the present application.

[0120] In some embodiments, the power conversion circuit 200 includes a first capacitor C1, a second capacitor C2, a first switch Q1, a second switch Q2, and an inductor L; wherein the first end of the first capacitor C1 is coupled to the first end of the first switch Q1 and is used to be coupled to the first end of the power input circuit 401, the second end of the first switch Q1 is coupled to the first end of the second switch 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 back-end signal circuit 402, the second end of the first capacitor C1 is coupled to the second end of the second switch Q2 and the second end of the second capacitor C2 and is used to be coupled to the second end of the power input circuit 401 and the second end of the back-end signal circuit 402, the third end of the first switch Q1 and the third end of the second switch Q2 are coupled to the second power input identification circuit 300.

[0121] In some embodiments, the power input circuit 401 can be specifically a photovoltaic charging module to provide photovoltaic input, or a direct current voltage source to provide direct current constant voltage input, and the second power input identification circuit 300 is used to identify the specific input type of the power input circuit 401. The back-end signal circuit 402 can be specifically a rechargeable battery, a direct current charging pile, an energy storage component, or any other reasonable load circuit or circuit unit for realizing a specific signal function, which is not limited in the present application.

[0122] In some embodiments, the first switch Q1 and the second switch Q2 can be specifically one of a MOSFET (Metal Oxide Semiconductor Field Effect Transistor), a transistor, a thin film transistor, or a field effect transistor, or any other reasonable switch, which is not limited in the present application.

[0123] It is worth noting that, in order to distinguish the two ends of each switch except the control end, one pole is called the first end and the other pole is called the second end. When each switch is a transistor, the control end, i.e. the third end, can be specifically a base, while the first end is a collector and the second end is an emitter; or the third end can also be specifically a base, while the first end is an emitter and the second end is a collector.

[0124] And when each switch tube is MOSFET, thin film transistor or field effect transistor, the third end can be gate, the first end can be drain, and the second end can be source; or the third end can also be gate, the first end can be source, and the second end can be drain.

[0125] In the case of MOSFET, thin film transistor or field effect transistor, the switch tube can also be a compound transistor or a single transistor, which is not limited in the present application.

[0126] It is worth noting that in other embodiments, the power conversion circuit 200 can also be one or more of boost circuit, bridge conversion circuit, or other forms of circuit topology, etc. for realizing the functions of AC / DC conversion, current / voltage amplitude adjustment, waveform frequency adjustment, etc. The second power input identification circuit 300 can also further include any reasonable sub-circuit unit for realizing more detailed signal functions, such as sub-circuit, analog-to-digital conversion sub-circuit, filtering sub-circuit, driving control sub-circuit, etc. The present application does not limit this.

[0127] Please continue to refer to Figure 9 , Figure 9 is Figure 7 the frame diagram of the control logic corresponding to S51-S510.

[0128] 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 driving control signal PWM sent by the second power input identification circuit 300, so as to change the switching state under the action of the driving control signal PWM, 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 back-end signal circuit 402.

[0129] Specifically, the second power input identification circuit 300 obtains the actual input voltage Uin provided by the power input circuit 401 to the power conversion circuit 200 from the power conversion circuit 200.

[0130] 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.

[0131] The second power input identification circuit 300 compares the actual input voltage Uin, i.e. the input sampling voltage V pv with the given value of the perturbed input voltage V pvmppt previously set by the MPPT perturbation control program, to obtain the difference between them, i.e. the error signal V pvErr , and based on the error signal V pvErr, using a control algorithm, for example, a proportional-integral-derivative controller, i.e. the perturbation voltage outer loop, with a transfer function generating a primary voltage outer loop output value I refpv ; wherein a proportional term, an integral term. The primary voltage outer loop output value I refpv reflects the degree of difference between the current state and the desired state of the power conversion circuit 200.

[0132] S53: obtaining a current loop output control value using the smaller one of the primary voltage outer loop output value and the maximum clamping value.

[0133] The second power input identification circuit 300 further compares the primary voltage outer loop output value I refpv and the maximum clamping value I refSet , and selects the smaller one as the back-end sampling current set value Ibat setchg . The back-end sampling current set value Ibat setchg is compared with the back-end sampling current Ibat, i.e. the output current Io, to obtain the difference therebetween, i.e. a current error signal Ibat chgerr , and based on the current error signal Ibat chgerr , a control algorithm (for example, a proportional-integral-derivative controller, i.e. a current loop) is used to generate a current loop output control value Ichg PIout .

[0134] S54: obtaining an output voltage of the power conversion circuit.

[0135] Specifically, the second power input identification circuit 300 obtains the current actual output voltage Vo, i.e. the back-end sampling voltage Vbat, from the power conversion circuit 200.

[0136] S55: obtaining a charging voltage loop output value using the output voltage.

[0137] The actual output voltage Vo, i.e. the back-end sampling voltage Vbat, is compared with a preset target voltage Vbat setchg to obtain the difference therebetween, i.e. a voltage error signal Vbat chgerr , and based on the voltage error signal Vbat chgerr , a control algorithm is used to generate a charging voltage loop output value Vchg PIout .

[0138] S56: detecting whether the primary voltage outer loop output value is smaller than the maximum clamping value.

[0139] It can be understood that by detecting whether the perturbation voltage outer loop is saturated, i.e. whether the primary voltage outer loop output value I refpv is smaller than the maximum clamping value IrefSet The current input type of the power conversion circuit 200 can be distinguished as photovoltaic power input or DC voltage source input.

[0140] If the primary voltage outer loop output value I refpv is less than the maximum limiting value I refSet , S57 is executed, and if the primary voltage outer loop output value I refpv is not less than the maximum limiting value I refSet , S59 is executed.

[0141] S57: detecting whether the current loop output control value is less than the charging voltage loop output value.

[0142] Further, it is detected whether the current loop output control value Ichg PIout is less than the charging voltage loop output value Vchg PIout .

[0143] If the current loop output control value Ichg PIout is less than the charging voltage loop output value Vchg PIout , S58 is executed, and if the current loop output control value Ichg PIout is not less than the charging voltage loop output value Vchg PIout , S59 is executed.

[0144] S58: adjusting the perturbation input voltage given value by using the set perturbation observation control program.

[0145] When it is detected that the primary voltage outer loop output value I refpv is less than the maximum limiting value I refSet , it is determined that the power conversion circuit 200 is in photovoltaic power input, and the set perturbation observation control program, i.e., the MPPT control mode, is used to adjust the perturbation input voltage given value V pvmppt for subsequent adjustment control.

[0146] S59: generating the driving control signal by using the smaller one of the current loop output control value and the charging voltage loop output value.

[0147] The second power input identification circuit 300 further compares the current loop output control value Ichg PIout and the charging voltage loop output value Vchg PIout , and selects the smaller one to generate the corresponding driving control signal PWM; wherein the driving control signal PWM can specifically include the first driving signal PWM1 and the second driving signal PWM2.

[0148] S510: sending the driving control signal to the power conversion circuit to trigger the change of the switching state, so as to adjust the output voltage of the power conversion circuit.

[0149] The second power input identification circuit 300 sends the generated first driving signal PWM1 and second driving signal PWM2 to the first switch Q1 and second switch Q2 in the power conversion circuit 200 respectively, to trigger the first switch Q1 and second switch Q2 to turn on or turn off respectively, so as to adjust the energy flow path in the power conversion circuit 200, to adjust the output voltage Vo.

[0150] The present application also provides an electronic device, please refer to Figure 10 , Figure 10 is a structural schematic diagram of an embodiment of the electronic device of the present application. In the embodiment, the electronic device 60 comprises a housing 61 and a third power input identification circuit 62 connected to the housing 61.

[0151] It should be noted that the third power input identification circuit 62 described in the embodiment is the first power input identification circuit 100, the second power input identification circuit 300 described in any of the above embodiments, please refer to Figures 1-9 and related text content, which will not be repeated here.

[0152] The beneficial effects of the present application are: unlike the prior art, the power input identification method provided by the present application obtains the input voltage of the power conversion circuit, to 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, and to intelligently identify the input type of the power conversion circuit by detecting whether the primary voltage outer loop output value is less than the maximum limiting value, that is, whether the perturbed voltage outer loop output is saturated, to determine that the power conversion circuit is a photovoltaic power input when the primary voltage outer loop output value is less than the maximum limiting value, and to determine that the power conversion circuit is a direct current voltage source input when the primary voltage outer loop output value is not less than the maximum limiting value, so as to combine the identification of the input type into the power conversion adjustment of the power conversion circuit, so that the control logic of the power conversion circuit is simpler, the operation complexity of the user is reduced, and the reliability of the system is improved; and no additional software algorithm is needed to realize the identification of the input type, and the software resources occupied are also less.

[0153] The above is only an embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent flow transformation using the content of the present application specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A power input identification method, applied to input identification of a power conversion circuit, characterized in that: The power input identification method includes: Obtaining an input voltage of the power conversion circuit; Obtaining a primary voltage outer loop output value using a difference between the input voltage and a given value of a disturbance input voltage; Detecting whether the primary voltage outer loop output value is less than a 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; Obtaining a current loop output control value using the smaller value of the primary voltage outer loop output value and the maximum amplitude limit value; generating a drive control signal using the current loop output control value; The driving control signal is sent to the power conversion circuit to trigger it to change the switch state, thereby adjusting the output voltage of the power conversion circuit.

2. The power input identification method according to claim 1, characterized in that: After the step of determining that the power conversion circuit is a photovoltaic power input, the method further includes: A set disturbance observation control program is used to adjust the disturbance input voltage set value.

3. The power input identification method according to claim 1, wherein: Before the step of obtaining the input voltage of the power conversion circuit, the method further includes: Obtaining a no-load input voltage of the power conversion circuit; Multiplying the no-load input voltage by a set proportional coefficient to obtain an initial value of the disturbance output voltage; wherein the set proportional coefficient is 0.8-1; The given value of the disturbance input voltage is assigned as the initial value of the disturbance output voltage.

4. The power input identification method according to claim 1, wherein: Before the step of generating a drive control signal by using the current loop output control value, the method further includes: Obtaining the output voltage of the power conversion circuit; Obtaining a charging voltage loop output value using the output voltage; The step of generating a drive control signal by using the current loop output control value comprises: The drive control signal is generated using a smaller value between the current loop output control value and the charging voltage loop output value.

5. The power input identification method according to claim 4, characterized in that: The step of obtaining the output value of the charging voltage loop by using the output voltage comprises: The charging voltage loop output value is obtained by performing proportional-integral adjustment on the difference between the output voltage and a given value of the power supply output voltage.

6. The power input identification method according to claim 4, characterized in that: Before the step of generating the driving control signal by using the smaller value of the current loop output control value and the charging voltage loop output value, the method further includes: Detecting whether the current loop output control value is less than the charging voltage loop output value; If the primary voltage outer loop output value is less than the maximum limit value, and the current loop output control value is less than the charging voltage loop output value, it is determined that the power conversion circuit is a photovoltaic power input.

7. The power input identification method according to claim 6, characterized in that: The power input identification method includes: If the primary voltage outer loop output value is not less than the maximum limit value, and / or the current loop output control value is not less than the charging voltage loop output value, it is determined that the power conversion circuit is a DC voltage source input.

8. A power input identification circuit, characterized in that: The power input identification circuit is used to couple with the power conversion circuit; The power input identification circuit controls the power conversion circuit using the power input identification method according to any one of claims 1 to 7.

9. An electronic device, characterized in that: The electronic device includes a housing and a power input identification circuit connected to the housing; Wherein, the power input identification circuit is the power input identification circuit as claimed in claim 8.

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