Voltage holding circuit and method thereof

Abstract

The present application relates to a voltage holding circuit and a method thereof. The voltage holding circuit includes: a solar cell, a sampling circuit and a dual error amplification circuit; the solar cell is connected to the dual error amplification circuit, and the sampling circuit is connected to the solar cell and the dual error amplification circuit respectively; the sampling circuit is used to obtain the output voltage of the solar cell and transmit the output voltage to the dual error amplification circuit; the dual error amplification circuit is used to determine the voltage error deviation corresponding to the output voltage according to the output voltage, the reference voltage and the reference error, and transmit the voltage error deviation to the solar cell; the solar cell is used to adjust the local output voltage according to the voltage error deviation to ensure that the local output voltage is maintained at the target voltage; the target voltage is determined according to the reference voltage and the reference error. The present application ensures that the output voltage is maintained at the target voltage and that the solar cell maintains the maximum output power.

Description

Technical Field

[0001] The present application relates to the technical field of voltage regulation, and in particular to a voltage maintaining circuit and method thereof. Background Art

[0002] With the continuous development of solar energy, more and more solar cells have been produced and put into use. Among them, a solar cell is a device that converts light energy into direct current energy.

[0003] The output power of traditional solar cells is affected by the size of their own voltage; when the solar cell's own voltage is less than the solar cell's inflection point voltage, the solar cell's output power is directly proportional to the output current, and, when the output current is fixed, the closer the solar cell's own voltage is to the solar cell's inflection point voltage, the greater the solar cell's output power.

[0004] However, the intensity of sunlight changes over time. Since the intensity of sunlight affects the output current of solar cells, the output power of solar cells will also change over time, making it difficult to ensure that the solar cells maintain the maximum output power. Summary of the invention

[0005] Based on this, it is necessary to provide a voltage holding circuit and method thereof that can ensure that a solar cell maintains a maximum output power in response to the above technical problems.

[0006] In a first aspect, the present application provides a voltage holding circuit. The circuit includes: a solar cell, a sampling circuit and a dual error amplifier circuit; the solar cell is connected to the dual error amplifier circuit, and the sampling circuit is connected to the solar cell and the dual error amplifier circuit respectively;

[0007] A sampling circuit, used for acquiring the output voltage of the solar cell and transmitting the output voltage to the dual error amplifier circuit;

[0008] A dual error amplifier circuit is used to determine a voltage error deviation corresponding to the output voltage according to the output voltage, the reference voltage and the reference error, and transmit the voltage error deviation to the solar cell;

[0009] The solar cell is used to adjust the local output voltage according to the voltage error deviation to ensure that the local output voltage is maintained at a target voltage; the target voltage is determined according to the reference voltage and the reference error.

[0010] In one embodiment, the dual error amplifier circuit includes: a first error amplifier circuit and a second error amplifier circuit; the first error amplifier circuit is connected to the second error amplifier circuit and the sampling circuit respectively; the second error amplifier circuit is also connected to the solar cell;

[0011] A first error amplifier circuit is used to determine a voltage error value according to a relationship between an output voltage and a reference voltage, and transmit the voltage error value to a second error amplifier circuit;

[0012] The second error amplifying circuit is used to determine the voltage error deviation according to the relationship between the voltage error value and the reference error, and transmit the voltage error deviation to the solar cell.

[0013] In one embodiment, the solar cell includes: a modulation circuit and an energy storage circuit; the modulation circuit is connected to the energy storage circuit and the second error amplifier circuit respectively; the energy storage circuit is connected to the sampling circuit;

[0014] A modulation circuit, used for adjusting the duty cycle of the solar cell according to the voltage error deviation value, and transmitting the duty cycle to the energy storage circuit;

[0015] The energy storage circuit is used to adjust the local output voltage according to the duty cycle to ensure that the local output voltage remains at the target voltage.

[0016] In one embodiment, the energy storage circuit is specifically used for:

[0017] According to the duty cycle, the input current of the solar cell is adjusted;

[0018] The local output voltage is adjusted according to the adjusted input current to ensure that the local output voltage remains at the target voltage.

[0019] In one embodiment, the energy storage circuit includes a switch, a switch control circuit and an energy storage element; the switch is connected to the energy storage element and the modulation circuit respectively; the switch control circuit is connected to the modulation circuit;

[0020] A switch control circuit, used for adjusting the switch state according to the duty cycle;

[0021] The energy storage element is used to adjust the output voltage to a target voltage according to the adjusted switching state.

[0022] In one embodiment, the solar cell is a direct current (DC)-DC power source.

[0023] In a second aspect, the present application also provides a voltage maintaining method. The method comprises:

[0024] The output voltage of the solar cell is obtained through a sampling circuit of the voltage holding circuit, and the output voltage is transmitted to the dual error amplifier circuit;

[0025] The voltage error deviation corresponding to the output voltage is determined according to the output voltage, the reference voltage and the reference error through the dual error amplifier circuit of the voltage holding circuit, and the voltage error deviation is transmitted to the solar cell;

[0026] The solar cell through the voltage holding circuit adjusts the local output voltage according to the voltage error deviation to ensure that the local output voltage remains at the target voltage; the target voltage is determined according to the reference voltage and the reference error.

[0027] In one embodiment, a voltage error deviation corresponding to the output voltage is determined according to the output voltage, the reference voltage and the reference error by a dual error amplifier circuit of the voltage holding circuit, and the voltage error deviation is transmitted to the solar cell, including:

[0028] Determine a voltage error value according to a relationship between an output voltage and a reference voltage through a first error amplifier circuit of a voltage holding circuit, and transmit the voltage error value to a second error amplifier circuit;

[0029] The voltage error deviation is determined according to the relationship between the voltage error value and the reference error through the second error amplification circuit of the voltage holding circuit, and the voltage error deviation is transmitted to the solar cell.

[0030] In one embodiment, a solar cell through a voltage holding circuit adjusts a local output voltage according to a voltage error deviation to ensure that the local output voltage is maintained at a target voltage; the target voltage is determined according to a reference voltage and a reference error, including:

[0031] A modulation circuit through the voltage holding circuit is used to adjust the duty cycle of the solar cell according to the voltage error deviation value and transmit the duty cycle to the energy storage circuit;

[0032] The energy storage circuit of the voltage holding circuit is used to adjust the local output voltage according to the duty cycle to ensure that the local output voltage is maintained at the target voltage.

[0033] In one embodiment, the energy storage circuit of the voltage holding circuit is used to adjust the local output voltage according to the duty cycle to ensure that the local output voltage is maintained at a target voltage, including:

[0034] According to the duty cycle, the input current of the solar cell is adjusted;

[0035] The local output voltage is adjusted according to the adjusted input current to ensure that the local output voltage remains at the target voltage.

[0036] According to the technical solution of the present application, the output voltage of the solar cell is acquired through the sampling circuit, which provides a data basis for determining the voltage error deviation according to the output voltage of the solar cell, thereby ensuring the smooth progress of the subsequent process and ensuring that the local output voltage can be smoothly adjusted in the subsequent process; through the dual error amplification circuit, the voltage error deviation is determined according to the output voltage, the reference voltage and the reference error, and the error size of the output voltage of the solar cell is acquired, thereby judging whether the output voltage of the solar cell needs to be adjusted and determining the degree of adjustment of the output voltage of the solar cell; through the solar cell, the local output voltage is adjusted according to the voltage error deviation, thereby ensuring that the output voltage is maintained at the target voltage, ensuring that the solar cell maintains the maximum output power, and improving the resource acquisition efficiency of the solar cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A current-voltage schematic diagram of a solar cell provided in an embodiment of the present application;

[0038] Figure 2 A structural block diagram of a first voltage holding circuit provided in an embodiment of the present application;

[0039] Figure 3 A structural block diagram of a second voltage holding circuit provided in an embodiment of the present application;

[0040] Figure 4 A structural block diagram of a third voltage holding circuit provided in an embodiment of the present application;

[0041] Figure 5 A structural block diagram of a fourth voltage holding circuit provided in an embodiment of the present application;

[0042] Figure 6 A flow chart of a voltage maintaining method provided in an embodiment of the present application;

[0043] Figure 7 A flowchart of the steps for determining a voltage error deviation provided in an embodiment of the present application;

[0044] Figure 8 A step flow for adjusting the local output voltage provided in an embodiment of the present application;

[0045] Fig. 9 A flowchart of another voltage maintaining method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0047] It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. In the description of the present application, the description of the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples without contradicting each other.

[0048] With the continuous development of solar energy, more and more solar cells have been produced and put into use. Among them, a solar cell is a device that converts light energy into direct current energy.

[0049] The output power of traditional solar cells is affected by their own voltage; Figure 1 As shown, when the voltage of the solar cell itself is less than the inflection point voltage of the solar cell ( Figure 1 The inflection point voltage in the curve is 17V), the output power of the solar cell is proportional to the output current, and, when the output current is fixed, the closer the solar cell's own voltage is to the inflection point voltage of the solar cell, the greater the output power of the solar cell.

[0050] In addition, the intensity of sunlight changes over time. Since the intensity of sunlight affects the output current of the solar cell, the output power of the solar cell will also change over time, making it difficult to ensure that the solar cell maintains the maximum output power.

[0051] The calculation formula of the solar cell output power is: P=U×I, P is the solar cell output power, U is the solar cell output voltage, and I is the solar cell input current.

[0052] The present application proposes a voltage holding circuit and method thereof. The present application obtains the output voltage of a solar cell through a sampling circuit, transmits the output voltage to a dual error amplifier circuit, determines the voltage error deviation corresponding to the output voltage through the dual error amplifier circuit, transmits the voltage error deviation to the solar cell, and adjusts the local output voltage according to the voltage error deviation through the solar cell.

[0053] Figure 2 The structural block diagram of the first voltage holding circuit provided in the embodiment of the present application is as follows: Figure 2 As shown, the voltage holding circuit may include: a solar cell 110, a sampling circuit 120 and a dual error amplifier circuit 130; the solar cell 110 and the dual error amplifier circuit 130 are connected, and the sampling circuit 120 is connected to the solar cell 110 and the dual error amplifier circuit 130 respectively;

[0054] The sampling circuit 120 is used to obtain the output voltage of the solar cell 110 and transmit the output voltage to the dual error amplifier circuit 130 .

[0055] It should be noted that when the sampling circuit 120 acquires the output voltage of the solar cell 110 , the following steps may be specifically included: the sampling circuit 120 acquires the output voltage of the solar cell 110 by acquiring the voltage signal of the solar cell 110 .

[0056] To further explain, the sampling circuit 120 can obtain the output voltage of the solar cell 110 in two ways: DC voltage sampling and AC voltage sampling. The two voltage sampling methods will be described in detail below.

[0057] In one embodiment of the present application, DC voltage sampling specifically includes the following steps: performing voltage division processing on the solar cell 110 through a resistor or a voltage sensor, then collecting a voltage signal of the output voltage of the solar cell 110 after voltage division, and then obtaining the output voltage of the solar cell 110 according to the voltage signal.

[0058] In another embodiment of the present application, AC voltage sampling specifically includes the following steps: the output voltage of the solar cell 110 is read through a voltage transformer, scaled to a suitable range, and input to an effective value detection chip, and then the output of the effective value detection chip is used to determine the voltage signal of the output voltage of the solar cell 110, and then the output voltage of the solar cell 110 is obtained according to the voltage signal.

[0059] The dual error amplifier circuit 130 is used to determine a voltage error deviation corresponding to the output voltage according to the output voltage, the reference voltage and the reference error, and transmit the voltage error deviation to the solar cell 110 .

[0060] The reference voltage refers to the optimal current in the actual application scenario of the solar cell. It can be understood that when the output voltage of the solar cell is the reference voltage, the solar cell can maintain the maximum output power. For example, when the actual application scenario of the solar cell is Figure 1 In the corresponding application scenario, due to Figure 1 The knee voltage of the solar cell is 17V. Figure 1 The reference voltage of the solar cell is 17V.

[0061] Among them, the reference error refers to the maximum error value between the output voltage of the solar cell and the reference voltage; further, if the error value between the output voltage of the solar cell and the reference voltage is less than or equal to the reference error, it means that the output voltage of the solar cell is within a reasonable range; if the error value between the output voltage of the solar cell and the reference voltage is greater than the reference error, it means that the output voltage of the solar cell is not within a reasonable range.

[0062] Among them, the voltage error deviation is used to indicate the error between the output voltage of the solar cell and the reference voltage and the error between the reference error; it can be understood that if the voltage error deviation is greater than the reference error, that is, the error value between the output voltage of the solar cell and the reference voltage is greater than the reference error, then it means that the output voltage of the solar cell is not within a reasonable range; if the voltage error deviation is less than or equal to the reference error, that is, the error value between the output voltage of the solar cell and the reference voltage is less than or equal to the reference error, then it means that the output voltage of the solar cell is within a reasonable range.

[0063] In one embodiment of the present application, when it is necessary to determine the voltage error deviation, a difference operation can be performed on the output voltage and the reference voltage based on the relationship between the output voltage and the reference voltage to determine the difference operation result, which is the voltage error value between the output voltage and the reference voltage; and then, based on the relationship between the voltage error value and the reference error, a difference operation is performed on the voltage error value and the reference error to determine the difference operation result, which is the voltage error deviation.

[0064] The solar cell 110 is used to adjust the local output voltage according to the voltage error deviation to ensure that the local output voltage is maintained at a target voltage; the target voltage is determined according to the reference voltage and the reference error.

[0065] It should be noted that when the local output voltage needs to be adjusted, the relationship between the local output voltage and the reference voltage can be determined based on the voltage error deviation. If the local output voltage is determined to be greater than the reference voltage based on the voltage error deviation, the local output voltage needs to be reduced; if the local output voltage is determined to be less than the reference voltage based on the voltage error deviation, the local output voltage needs to be increased.

[0066] To further illustrate, when the local output voltage needs to be reduced, the difference between the voltage error value and the reference error can be determined based on the voltage error deviation; therefore, the voltage amount by which the local output voltage is reduced should be greater than or equal to the difference between the voltage error value and the reference error, and less than the voltage error value between the output voltage and the reference voltage.

[0067] To further illustrate, when the local output voltage needs to be increased, the difference between the voltage error value and the reference error can be determined based on the voltage error deviation; therefore, the voltage amount by which the local output voltage is increased should be greater than or equal to the difference between the voltage error value and the reference error, and less than the voltage error value between the output voltage and the reference voltage.

[0068] According to the voltage holding circuit of the present application, the output voltage of the solar cell is acquired through the sampling circuit, which provides a data basis for determining the voltage error deviation according to the output voltage of the solar cell, thereby ensuring the smooth progress of the subsequent process and ensuring that the local output voltage can be smoothly adjusted in the subsequent process; through the dual error amplification circuit, the voltage error deviation is determined according to the output voltage, the reference voltage and the reference error, and the error size of the output voltage of the solar cell is acquired, thereby judging whether the output voltage of the solar cell needs to be adjusted and determining the degree of adjustment of the output voltage of the solar cell; through the solar cell, the local output voltage is adjusted according to the voltage error deviation, thereby ensuring that the output voltage is maintained at the target voltage, ensuring that the solar cell maintains the maximum output power, and improving the resource acquisition efficiency of the solar cell.

[0069] It should be noted that Figure 3 The structural block diagram of the second voltage holding circuit provided in the embodiment of the present application is as follows: Figure 3 As shown, the dual error amplifier circuit 130 includes: a first error amplifier circuit 131 and a second error amplifier circuit 132 ; the first error amplifier circuit 131 is connected to the second error amplifier circuit 132 and the sampling circuit 120 respectively; the second error amplifier circuit 132 is also connected to the solar cell 110 .

[0070] The first error amplifier circuit 131 is used to determine a voltage error value according to a relationship between an output voltage and a reference voltage, and transmit the voltage error value to the second error amplifier circuit 132 .

[0071] It should be noted that the voltage error value is used to indicate the difference between the output voltage and the reference voltage. It can be understood that the larger the voltage error value, the larger the error between the output voltage and the reference voltage; the smaller the voltage error value, the smaller the error between the output voltage and the reference voltage.

[0072] To further explain, the voltage error value can be both positive and negative. When the voltage error value is positive, it means that the difference calculation result obtained by subtracting the output voltage from the reference voltage is positive, that is, the output voltage is greater than the reference voltage; when the voltage error value is negative, it means that the difference calculation result obtained by subtracting the output voltage from the reference voltage is negative, that is, the output voltage is less than the reference voltage.

[0073] The second error amplifying circuit 132 is used to determine the voltage error deviation according to the relationship between the voltage error value and the reference error, and transmit the voltage error deviation to the solar cell 110 .

[0074] In one embodiment of the present application, when the voltage error deviation needs to be determined, a difference operation can be performed on the voltage error value and the reference error to determine the difference operation result, which is the voltage error deviation.

[0075] It should be noted that the voltage error deviation can be either positive or negative. When the voltage error deviation is a positive value, it means that the difference calculation result obtained by subtracting the voltage error value from the reference error is a positive value, that is, the voltage error value is greater than the reference error; when the voltage error deviation is a negative value, it means that the difference calculation result obtained by subtracting the voltage error value from the reference error is a negative value, that is, the voltage error value is less than the reference error.

[0076] According to the voltage holding circuit of the present application, the voltage error value between the output voltage and the reference voltage is determined through the first error amplification circuit, thereby ensuring that the voltage error deviation can be determined based on the voltage error value in the subsequent process; ensuring that the degree of adjustment of the output voltage of the solar cell can be smoothly determined in the subsequent process, ensuring the accuracy of adjusting the output voltage of the solar cell, and further ensuring that the output voltage is maintained at the target voltage, so that the solar cell can subsequently maintain the maximum output power, thereby improving the resource acquisition efficiency of the solar cell.

[0077] It should be noted that Figure 4 The structural block diagram of the third voltage holding circuit provided in the embodiment of the present application is as follows: Figure 4As shown, the solar cell 110 includes: a modulation circuit 111 and an energy storage circuit 112; the modulation circuit 111 is connected to the energy storage circuit 112 and the second error amplifier circuit 130 respectively; the energy storage circuit 112 is connected to the sampling circuit 120;

[0078] The modulation circuit 111 is used to adjust the duty cycle of the solar cell 110 according to the voltage error deviation value and transmit the duty cycle to the energy storage circuit 112 .

[0079] Wherein, the solar cell can be a direct current (DC-DC) power source.

[0080] The duty cycle of the solar cell 110 is used to adjust the output voltage of the solar cell 110. To further explain, different output voltages of the solar cell 110 correspond to different duty cycles.

[0081] In one embodiment of the present application, when determining the voltage error deviation value, the voltage amount by which the output voltage of the solar cell 110 needs to be adjusted can be determined based on the voltage error deviation value, and the duty cycle change amount corresponding to the voltage amount by which the output voltage of the solar cell 110 needs to be adjusted can be determined based on the relationship between the output voltage and the duty cycle of the solar cell 110. The duty cycle change amount is the adjustment amount required to adjust the duty cycle of the solar cell 110.

[0082] In another embodiment of the present application, when the voltage error deviation value is determined, the duty cycle corresponding to the current output voltage of the solar cell 110 can be determined; and the target duty cycle when the output voltage of the solar cell 110 is the target voltage is determined, and the duty cycle change corresponding to the voltage amount by which the output voltage of the solar cell 110 needs to be adjusted is determined by performing a difference operation between the duty cycle and the target duty cycle. The duty cycle change is the adjustment amount required to adjust the duty cycle of the solar cell 110.

[0083] Furthermore, if the duty cycle change is a positive value, it means that the duty cycle and the target duty cycle are subjected to a difference operation, and the obtained difference operation result is a positive value, that is, the duty cycle is greater than the target duty cycle. Therefore, when the duty cycle of the solar cell 110 is subsequently adjusted, the duty cycle of the solar cell 110 needs to be reduced; if the duty cycle change is a negative value, it means that the duty cycle and the target duty cycle are subjected to a difference operation, and the obtained difference operation result is a negative value, that is, the duty cycle is less than the target duty cycle. Therefore, when the duty cycle of the solar cell 110 is subsequently adjusted, the duty cycle of the solar cell 110 needs to be increased.

[0084] The energy storage circuit 112 is used to adjust the local output voltage according to the duty cycle to ensure that the local output voltage remains at the target voltage.

[0085] It should be noted that when the local output voltage is adjusted, the energy storage circuit is specifically used to: adjust the input current of the solar cell according to the duty cycle; and adjust the local output voltage according to the adjusted input current to ensure that the local output voltage remains at the target voltage.

[0086] In one embodiment of the present application, since the duty cycle of the solar cell 110 can directly affect the input current of the solar cell 110, when the local output voltage needs to be adjusted according to the duty cycle, the input current of the solar cell 110 is directly adjusted according to the duty cycle of the solar cell 110. Then, the solar cell 110 determines the output voltage corresponding to the adjusted input current according to the characteristics shown by its own current-voltage curve, thereby completing the adjustment of the local output voltage.

[0087] Further explanation, such as Figure 5 As shown, Figure 5 This is a structural block diagram of a fourth voltage holding circuit provided in an embodiment of the present application, wherein the energy storage circuit 112 includes a switch 1121, a switch control circuit 1122, and an energy storage element 1123; the switch 1121 is connected to the energy storage element 1123 and the modulation circuit 1122 respectively; the switch control circuit 1122 is connected to the modulation circuit 111;

[0088] The switch control circuit 1122 is used to adjust the state of the switch 1121 according to the duty cycle.

[0089] It should be noted that, in order to ensure that the output voltage can be adjusted subsequently, so as to ensure that the output voltage is adjusted to the target voltage, it is necessary to determine the adjustment amount of the output voltage according to the duty cycle, and then adjust the output voltage by controlling the state of the switch 1121;

[0090] In one embodiment of the present application, the required adjustment amount for the output voltage is determined based on the duty cycle, and it is judged whether the adjustment amount for the output voltage is an increase adjustment amount or a decrease adjustment amount; when the adjustment amount for the output voltage is an increase adjustment amount, the state of switch 1121 is adjusted to a voltage increase state, thereby ensuring that the output voltage is adjusted to an increase; when the adjustment amount for the output voltage is a decrease adjustment amount, the state of switch 1121 is adjusted to a voltage decrease state, thereby ensuring that the output voltage is adjusted to a decrease.

[0091] The energy storage element 1123 is used to adjust the output voltage to a target voltage according to the adjusted state of the switch 1121 .

[0092] It should be noted that the state of switch 1121 will directly affect the output voltage of the energy storage unit 1123; when the state of switch 1121 is a voltage amplification state, the energy storage unit 1123 will output a larger output voltage; when the state of switch 1121 is a voltage reduction state, the energy storage unit 1123 will output a smaller output voltage.

[0093] According to the voltage maintaining device of the present application, the duty cycle of the solar cell is adjusted according to the voltage error deviation value through a modulation circuit, thereby ensuring that the local output voltage can be subsequently adjusted according to the duty cycle of the solar cell, thereby achieving local output voltage adjustment, ensuring that the output voltage remains at the target voltage, ensuring that the solar cell maintains the maximum output power, and improving the resource acquisition efficiency of the solar cell.

[0094] In one embodiment, Figure 6 As shown, Figure 6 A flow chart of a voltage maintaining method provided in an embodiment of the present application provides a voltage maintaining method, which may include the following steps:

[0095] Step 601, obtaining the output voltage of the solar cell through the sampling circuit of the voltage holding circuit, and transmitting the output voltage to the dual error amplifier circuit.

[0096] Step 602, determining the voltage error deviation corresponding to the output voltage according to the output voltage, the reference voltage and the reference error through the dual error amplifier circuit of the voltage holding circuit, and transmitting the voltage error deviation to the solar cell.

[0097] Step 603, the solar cell of the voltage holding circuit adjusts the local output voltage according to the voltage error deviation to ensure that the local output voltage is maintained at the target voltage; the target voltage is determined according to the reference voltage and the reference error.

[0098] Among them, the solar cell is a direct current (DC-DC) power source.

[0099] According to the voltage maintaining method of the present application, the output voltage of the solar cell is acquired through the sampling circuit, which provides a data basis for determining the voltage error deviation according to the output voltage of the solar cell, thereby ensuring the smooth progress of the subsequent process and ensuring that the local output voltage can be smoothly adjusted in the subsequent process; through the dual error amplification circuit, the voltage error deviation is determined according to the output voltage, the reference voltage and the reference error, and the error size of the output voltage of the solar cell is acquired, thereby judging whether the output voltage of the solar cell needs to be adjusted and determining the degree of adjustment of the output voltage of the solar cell; through the solar cell, the local output voltage is adjusted according to the voltage error deviation, thereby ensuring that the output voltage is maintained at the target voltage, ensuring that the solar cell maintains the maximum output power, and improving the resource acquisition efficiency of the solar cell.

[0100] It should be noted that the voltage error deviation sent to the solar cell can be determined by the voltage error value. Figure 7 As shown, Figure 7 A flowchart of a step of determining a voltage error deviation is provided in an embodiment of the present application. Specifically, determining the voltage error deviation may include the following steps:

[0101] Step 701 : determining a voltage error value according to a relationship between an output voltage and a reference voltage through a first error amplifier circuit of a voltage holding circuit, and transmitting the voltage error value to a second error amplifier circuit.

[0102] Step 702 , determining the voltage error deviation according to the relationship between the voltage error value and the reference error through the second error amplifier circuit of the voltage holding circuit, and transmitting the voltage error deviation to the solar cell.

[0103] According to the voltage maintaining method of the present application, the voltage error value between the output voltage and the reference voltage is determined through the first error amplification circuit, thereby ensuring that the voltage error deviation can be determined based on the voltage error value in the subsequent process; ensuring that the degree of adjustment of the output voltage of the solar cell can be smoothly determined in the subsequent process, ensuring the accuracy of adjusting the output voltage of the solar cell, and further ensuring that the output voltage is maintained at the target voltage, so that the solar cell can subsequently maintain the maximum output power, thereby improving the resource acquisition efficiency of the solar cell.

[0104] It should be noted that the local output voltage can be adjusted by the duty cycle of the solar cell. Figure 8 As shown, Figure 8 A flowchart of the steps for adjusting the local output voltage provided in an embodiment of the present application. Specifically, adjusting the local output voltage may include the following steps:

[0105] Step 801, adjusting the duty cycle of the solar cell according to the voltage error deviation value through the modulation circuit of the voltage holding circuit, and transmitting the duty cycle to the energy storage circuit.

[0106] Step 802, adjusting the local output voltage according to the duty cycle through the energy storage circuit of the voltage holding circuit to ensure that the local output voltage is maintained at the target voltage.

[0107] It should be noted that the input current of the solar cell is adjusted according to the duty cycle; and the local output voltage is adjusted according to the adjusted input current to ensure that the local output voltage is maintained at the target voltage.

[0108] In one embodiment of the present application, the energy storage circuit includes a switch, a switch control circuit and an energy storage element; the switch is respectively connected to the energy storage element and the modulation circuit; the switch control circuit is connected to the modulation circuit; the switch control circuit is used to adjust the switch state according to the duty cycle; the energy storage element is used to adjust the output voltage to the target voltage according to the adjusted switch state.

[0109] According to the voltage maintaining method of the present application, the duty cycle of the solar cell is adjusted according to the voltage error deviation value through a modulation circuit, thereby ensuring that the local output voltage can be subsequently adjusted according to the duty cycle of the solar cell, thereby achieving local output voltage adjustment, ensuring that the output voltage remains at the target voltage, ensuring that the solar cell maintains the maximum output power, and improving the resource acquisition efficiency of the solar cell.

[0110] In one embodiment of the present application, Fig. 9 As shown, Fig. 9 A flowchart of another voltage maintenance method provided in an embodiment of the present application, when it is necessary to keep the local output voltage at the target voltage, may specifically include the following steps:

[0111] Step 901, obtaining the output voltage of the solar cell through the sampling circuit of the voltage holding circuit, and transmitting the output voltage to the dual error amplifier circuit.

[0112] Step 902 , determining a voltage error value according to a relationship between an output voltage and a reference voltage through a first error amplifier circuit of a voltage holding circuit, and transmitting the voltage error value to a second error amplifier circuit.

[0113] Step 903, determining the voltage error deviation according to the relationship between the voltage error value and the reference error through the second error amplifier circuit of the voltage holding circuit, and transmitting the voltage error deviation to the solar cell.

[0114] Step 904, adjusting the duty cycle of the solar cell according to the voltage error deviation value through the modulation circuit of the voltage holding circuit, and transmitting the duty cycle to the energy storage circuit.

[0115] Step 905 , adjusting the local output voltage according to the duty cycle through the energy storage circuit of the voltage holding circuit to ensure that the local output voltage is maintained at the target voltage.

[0116] It should be noted that the input current of the solar cell is adjusted according to the duty cycle; and the local output voltage is adjusted according to the adjusted input current to ensure that the local output voltage is maintained at the target voltage.

[0117] In one embodiment of the present application, the energy storage circuit includes a switch, a switch control circuit and an energy storage element; the switch is respectively connected to the energy storage element and the modulation circuit; the switch control circuit is connected to the modulation circuit; the switch control circuit is used to adjust the switch state according to the duty cycle; the energy storage element is used to adjust the output voltage to the target voltage according to the adjusted switch state.

[0118] According to the voltage maintaining method of the present application, the output voltage of the solar cell is acquired through the sampling circuit, which provides a data basis for determining the voltage error deviation according to the output voltage of the solar cell, thereby ensuring the smooth progress of the subsequent process and ensuring that the local output voltage can be smoothly adjusted in the subsequent process; through the dual error amplification circuit, the voltage error deviation is determined according to the output voltage, the reference voltage and the reference error, and the error size of the output voltage of the solar cell is acquired, thereby judging whether the output voltage of the solar cell needs to be adjusted and determining the degree of adjustment of the output voltage of the solar cell; through the solar cell, the local output voltage is adjusted according to the voltage error deviation, thereby ensuring that the output voltage is maintained at the target voltage, ensuring that the solar cell maintains the maximum output power, and improving the resource acquisition efficiency of the solar cell.

[0119] It should be understood that, although the steps in the flowcharts involved in the above embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above embodiments may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0120] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0121] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A voltage holding circuit, characterized in that: include: A solar cell, a sampling circuit and a dual error amplification circuit; the solar cell is connected to the dual error amplification circuit, and the sampling circuit is connected to the solar cell and the dual error amplification circuit respectively; The sampling circuit is used to obtain the output voltage of the solar cell and transmit the output voltage to the dual error amplifier circuit; The dual error amplifier circuit is used to determine the voltage error deviation corresponding to the output voltage according to the output voltage, the reference voltage and the reference error, and transmit the voltage error deviation to the solar cell; The solar cell is used to adjust the local output voltage according to the voltage error deviation to ensure that the local output voltage remains at a target voltage; The target voltage is determined according to the reference voltage and the reference error; Wherein, the dual error amplifier circuit includes: a first error amplifier circuit and a second error amplifier circuit; the first error amplifier circuit is connected to the second error amplifier circuit and the sampling circuit respectively; the second error amplifier circuit is also connected to the solar cell; The first error amplifier circuit is used to determine the voltage error value according to the relationship between the output voltage and the reference voltage, and transmit the voltage error value to the second error amplifier circuit; The second error amplifying circuit is used to determine the voltage error deviation according to the relationship between the voltage error value and the reference error, and transmit the voltage error deviation to the solar cell.

2. The circuit according to claim 1, characterized in that The solar cell comprises: a modulation circuit and an energy storage circuit; the modulation circuit is connected to the energy storage circuit and the second error amplifier circuit respectively; the energy storage circuit is connected to the sampling circuit; The modulation circuit is used to adjust the duty cycle of the solar cell according to the voltage error deviation, and transmit the duty cycle to the energy storage circuit; The energy storage circuit is used to adjust the local output voltage according to the duty cycle to ensure that the local output voltage is maintained at the target voltage.

3. The circuit according to claim 2, characterized in that The energy storage circuit is specifically used for: According to the duty cycle, adjusting the input current of the solar cell; The local output voltage is adjusted according to the adjusted input current to ensure that the local output voltage is maintained at the target voltage.

4. The circuit according to claim 2, characterized in that The energy storage circuit comprises a switch, a switch control circuit and an energy storage element; the switch is connected to the energy storage element and the modulation circuit respectively; the switch control circuit is connected to the modulation circuit; The switch control circuit is used to adjust the switch state according to the duty cycle; The energy storage element is used to adjust the output voltage to a target voltage according to the adjusted switch state.

5. The circuit according to any one of claims 1 to 4, characterized in that: The solar cell is a direct current (DC)-direct current (DC) power source.

6. A voltage maintaining method, characterized in that: The method is performed by the voltage holding circuit according to any one of claims 1 to 5, and the method comprises: Acquiring the output voltage of the solar cell through the sampling circuit of the voltage holding circuit, and transmitting the output voltage to the dual error amplifier circuit; Determine the voltage error deviation corresponding to the output voltage according to the output voltage, the reference voltage and the reference error through the dual error amplifier circuit of the voltage holding circuit, and transmit the voltage error deviation to the solar cell; The solar cell through the voltage holding circuit adjusts the local output voltage according to the voltage error deviation to ensure that the local output voltage is maintained at a target voltage; the target voltage is determined according to the reference voltage and the reference error.

7. The method according to claim 6, characterized in that The sampling circuit of the voltage holding circuit acquires the output voltage of the solar cell in a DC voltage sampling or AC voltage sampling manner.

8. The method according to claim 6, characterized in that The dual error amplification circuit of the voltage holding circuit determines the voltage error deviation corresponding to the output voltage according to the output voltage, the reference voltage and the reference error, and transmits the voltage error deviation to the solar cell, including: Determine the voltage error value according to the relationship between the output voltage and the reference voltage through the first error amplifier circuit of the voltage holding circuit, and transmit the voltage error value to the second error amplifier circuit; The voltage error deviation is determined according to the relationship between the voltage error value and the reference error by the second error amplifying circuit of the voltage holding circuit, and the voltage error deviation is transmitted to the solar cell.

9. The method according to claim 6, characterized in that The solar cell passing through the voltage holding circuit adjusts the local output voltage according to the voltage error deviation to ensure that the local output voltage is maintained at the target voltage; The target voltage is determined according to the reference voltage and the reference error, including: A modulation circuit of the voltage holding circuit is used to adjust the duty cycle of the solar cell according to the voltage error deviation and transmit the duty cycle to the energy storage circuit; The energy storage circuit of the voltage holding circuit is used to adjust the local output voltage according to the duty cycle to ensure that the local output voltage is maintained at the target voltage.

10. The method according to claim 9, characterized in that The energy storage circuit through the voltage holding circuit is used to adjust the local output voltage according to the duty cycle to ensure that the local output voltage is maintained at the target voltage, including: According to the duty cycle, adjusting the input current of the solar cell; The local output voltage is adjusted according to the adjusted input current to ensure that the local output voltage is maintained at the target voltage.

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