CN116027839A - Voltage holding circuit and method thereof - Google Patents
Voltage holding circuit and method thereof Download PDFInfo
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- CN116027839A CN116027839A CN202310012453.5A CN202310012453A CN116027839A CN 116027839 A CN116027839 A CN 116027839A CN 202310012453 A CN202310012453 A CN 202310012453A CN 116027839 A CN116027839 A CN 116027839A
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Abstract
The application relates to a voltage holding circuit and a method thereof. The voltage holding circuit includes: a solar cell, a sampling circuit and a double error amplifying circuit; the solar battery is connected with the double error amplifying circuit, and the sampling circuit is respectively connected with the solar battery and the double error amplifying circuit; the sampling circuit is used for acquiring the output voltage of the solar battery and transmitting the output voltage to the double-error amplifying circuit; the double error amplifying circuit is used for determining the voltage error deviation corresponding to the output voltage according to the output voltage, the reference voltage and the reference error and transmitting the voltage error deviation to the solar cell; the solar battery is used for adjusting the local output voltage according to the voltage error deviation degree so as to ensure that the local output voltage is kept at the target voltage; the target voltage is determined from the reference voltage and the reference error. The method and the device ensure that the output voltage is kept at the target voltage, and the solar cell is ensured to maintain the maximum output power.
Description
Technical Field
The present disclosure relates to voltage regulation technologies, and in particular, to a voltage holding circuit and a method thereof.
Background
With the continuous development of solar energy, more and more solar cells are produced and put into use, wherein the solar cells are devices for converting light energy into direct current energy.
The output power of the traditional solar battery can be influenced by the voltage of the traditional solar battery; when the self voltage of the solar cell is smaller than the inflection point voltage of the solar cell, the output power of the solar cell is in a direct proportion relation with the output current, and when the output current is fixed, the closer the self voltage of the solar cell is to the inflection point voltage of the solar cell, the larger the output power of the solar cell is.
However, the illumination intensity of the sun may change over time, and since the illumination intensity may affect the output current of the solar cell, the output power of the solar cell may also change over time, which may make it difficult to ensure that the solar cell maintains the maximum output power.
Disclosure of Invention
In view of the above, it is desirable to provide a voltage holding circuit and a method thereof that can ensure that a solar cell maintains maximum output power.
In a first aspect, the present application provides a voltage holding circuit. The circuit comprises: a solar cell, a sampling circuit and a double error amplifying circuit; the solar battery is connected with the double error amplifying circuit, and the sampling circuit is respectively connected with the solar battery and the double error amplifying circuit;
the sampling circuit is used for acquiring the output voltage of the solar battery and transmitting the output voltage to the double-error amplifying circuit;
the double error amplifying circuit is used for determining the voltage error deviation corresponding to the output voltage according to the output voltage, the reference voltage and the reference error and transmitting the voltage error deviation to the solar cell;
the solar battery is used for adjusting the local output voltage according to the voltage error deviation degree so as to ensure that the local output voltage is kept at the target voltage; the target voltage is determined from the reference voltage and the reference error.
In one embodiment, a dual error amplifying circuit includes: a first error amplifying circuit and a second error amplifying circuit; the first error amplifying circuit is respectively connected with the second error amplifying circuit and the sampling circuit; the second error amplifying circuit is also connected with the solar cell;
the first error amplifying circuit is used for determining a voltage error value according to the relation between the output voltage and the reference voltage and transmitting the voltage error value to the second error amplifying circuit;
and the second error amplifying circuit is used for determining the voltage error deviation degree according to the relation between the voltage error value and the reference error and transmitting the voltage error deviation degree to the solar cell.
In one embodiment, a solar cell includes: a modulation circuit and a tank circuit; the modulation circuit is respectively connected with the energy storage circuit and the second error amplifying circuit; the energy storage circuit is connected with the sampling circuit;
the modulating circuit is used for adjusting the duty ratio of the solar battery according to the voltage error deviation value and transmitting the duty ratio to the energy storage circuit;
and the energy storage circuit is used for adjusting the local output voltage according to the duty ratio so as to ensure that the local output voltage is kept at the target voltage.
In one embodiment, the tank circuit is specifically configured to:
according to the duty ratio, adjusting the input current of the solar cell;
and regulating the local output voltage according to the regulated input current to ensure that the local output voltage is kept at the target voltage.
In one embodiment, the tank circuit includes a switch, a switch control circuit, and a tank element; the switch is respectively connected with the energy storage element and the modulation circuit; the switch control circuit is connected with the modulation circuit;
the switch control circuit is used for adjusting the switch state according to the duty ratio;
and the energy storage element is used for adjusting the output voltage to the target voltage according to the adjusted switch state.
In one embodiment, the solar cell is a direct current-direct current, DC-DC, power supply.
In a second aspect, the present application also provides a voltage holding method. The method comprises the following steps:
the output voltage of the solar battery is obtained through a sampling circuit of the voltage holding circuit, and the output voltage is transmitted to the double error amplifying circuit;
determining a voltage error deviation degree corresponding to the output voltage according to the output voltage, the reference voltage and the reference error by a double error amplifying circuit of the voltage holding circuit, and transmitting the voltage error deviation degree to the solar cell;
the solar battery of the voltage holding circuit is used for adjusting the local output voltage according to the deviation degree of the voltage error so as to ensure that the local output voltage is kept at the target voltage; the target voltage is determined from the reference voltage and the reference error.
In one embodiment, determining, by a double error amplifying circuit of a voltage holding circuit, a voltage error deviation corresponding to an output voltage according to the output voltage, a reference voltage, and a reference error, and transmitting the voltage error deviation to a solar cell, includes:
determining a voltage error value according to the relation between the output voltage and the reference voltage by a first error amplifying circuit of the voltage holding circuit, and transmitting the voltage error value to a second error amplifying circuit;
and determining the voltage error deviation degree according to the relation between the voltage error value and the reference error by a second error amplifying circuit of the voltage holding circuit, and transmitting the voltage error deviation degree to the solar cell.
In one embodiment, the solar battery of the voltage holding circuit is used for adjusting the local output voltage according to the deviation degree of the voltage error so as to ensure that the local output voltage is kept at the target voltage; the target voltage is determined according to the reference voltage and the reference error, and comprises the following steps:
the modulating circuit is used for adjusting the duty ratio of the solar battery according to the voltage error deviation value and transmitting the duty ratio to the energy storage circuit;
and the energy storage circuit of the voltage holding circuit is used for adjusting the local output voltage according to the duty ratio so as to ensure that the local output voltage is kept at the target voltage.
In one embodiment, the energy storage circuit of the voltage holding circuit is configured to regulate the local output voltage according to the duty cycle to ensure that the local output voltage is maintained at the target voltage, and includes:
according to the duty ratio, adjusting the input current of the solar cell;
and regulating the local output voltage according to the regulated input current to ensure that the local output voltage is kept at the target voltage.
According to the technical scheme, the acquisition of the output voltage of the solar battery is realized through the sampling circuit, a data basis is provided for the follow-up determination of the voltage error deviation degree according to the output voltage of the solar battery, the smooth proceeding of the follow-up flow is ensured, and the follow-up voltage adjustment can be performed on the local output voltage smoothly; the dual error amplifying circuit is used for determining the deviation degree of the voltage error according to the output voltage, the reference voltage and the reference error, obtaining the error of the output voltage of the solar cell, judging whether the output voltage of the solar cell needs to be adjusted or not, and determining the adjustment degree of the output voltage of the solar cell; the solar cell is used for adjusting the local output voltage according to the deviation degree of the voltage error, so that the output voltage is kept at the target voltage, the solar cell is ensured to maintain the maximum output power, and the resource acquisition efficiency of the solar cell is improved.
Drawings
Fig. 1 is a schematic diagram of current and voltage of a solar cell according to an embodiment of the present disclosure;
fig. 2 is a block diagram of a first voltage holding circuit according to an embodiment of the present application;
FIG. 3 is a block diagram of a second voltage holding circuit according to an embodiment of the present disclosure;
fig. 4 is a block diagram of a third voltage holding circuit according to an embodiment of the present application;
fig. 5 is a block diagram of a fourth voltage holding circuit according to an embodiment of the present application;
FIG. 6 is a flowchart of a voltage holding method according to an embodiment of the present disclosure;
FIG. 7 is a flowchart illustrating a step of determining a deviation degree of a voltage error according to an embodiment of the present application;
FIG. 8 is a flowchart illustrating a step of adjusting a local output voltage according to an embodiment of the present disclosure;
fig. 9 is a flowchart of another voltage holding method according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application. In the description of the present application, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
With the continuous development of solar energy, more and more solar cells are produced and put into use, wherein the solar cells are devices for converting light energy into direct current energy.
The output power of the traditional solar battery can be influenced by the voltage of the traditional solar battery; as shown in fig. 1, when the self voltage of the solar cell is smaller than the inflection point voltage of the solar cell (the inflection point voltage is 17V in the graph of fig. 1), the output power of the solar cell is in a proportional relationship with the output current, and when the output current is fixed, the closer the self voltage of the solar cell is to the inflection point voltage of the solar cell, the larger the output power of the solar cell is.
In addition, the illumination intensity of the sun may change over time, and since the illumination intensity may affect the output current of the solar cell, the output power of the solar cell may also change over time, thereby making it difficult to ensure that the solar cell maintains the maximum output power.
The calculation formula of the output power of the solar battery is as follows: 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.
The application provides a voltage holding circuit and a method thereof. According to the solar cell output voltage detection circuit, the output voltage of the solar cell is obtained through the sampling circuit, and the output voltage is transmitted to the double error amplifying circuit; determining the voltage error deviation degree corresponding to the output voltage through a double error amplifying circuit, and transmitting the voltage error deviation degree to the solar cell; and regulating the local output voltage according to the voltage error deviation degree through the solar cell.
Fig. 2 is a block diagram of a first voltage holding circuit according to an embodiment of the present application, and as shown in fig. 2, the voltage holding circuit may include: a solar cell 110, a sampling circuit 120, and a double error amplifying circuit 130; the solar cell 110 is in circuit connection with the double-error amplifying circuit 130, and the sampling circuit 120 is respectively connected with the solar cell 110 and the double-error amplifying circuit 130;
the sampling circuit 120 is configured to obtain an output voltage of the solar cell 110, and transmit the output voltage to the double error amplifying circuit 130.
It should be noted that, when the sampling circuit 120 obtains the output voltage of the solar cell 110, the method specifically includes the following steps: the sampling circuit 120 obtains the output voltage of the solar cell 110 by obtaining the voltage signal of the solar cell 110.
Further, the sampling circuit 120 may be divided into a dc voltage sampling and an ac voltage sampling in a manner of obtaining the output voltage of the solar cell 110; the two voltage sampling methods will be described in detail below.
In one embodiment of the present application, the dc voltage sampling specifically includes the steps of: the voltage dividing process is performed on the solar cell 110 through a resistor or a voltage sensor, then a voltage signal of the output voltage of the solar cell 110 after the voltage division is acquired, and then the output voltage of the solar cell 110 is acquired according to the voltage signal.
In another embodiment of the present application, the ac voltage sampling specifically includes the steps of: the output voltage of the solar cell 110 is read through the voltage transformer, is scaled to a proper range, is input to the effective value detection chip, and then the output of the effective value detection chip is used for determining a voltage signal of the output voltage of the solar cell 110, so that the output voltage of the solar cell 110 is obtained according to the voltage signal.
The dual error amplifying circuit 130 is configured 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.
The reference voltage refers to an optimal current of the solar cell in an actual application scene, and 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 operation scenario corresponding to the solar cell is the operation scenario corresponding to fig. 1, since the inflection point voltage of the solar cell in fig. 1 is 17V, the reference voltage of the solar cell in fig. 1 is 17V.
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 of the output voltage of the solar cell and the reference voltage is smaller than or equal to the reference error, the output voltage of the solar cell is within a reasonable range; if the error value of the output voltage of the solar cell and the reference voltage is larger than the reference error, the output voltage of the solar cell is not in a reasonable range.
The voltage error deviation degree is used for representing the error magnitude between the error of the output voltage of the solar cell and the reference voltage and the reference error; it can be understood that if the deviation of the voltage error is greater than the reference error, that is, the error value of the output voltage of the solar cell and the reference voltage is greater than the reference error, the output voltage of the solar cell is not within a reasonable range; if the deviation degree of the voltage error is smaller than or equal to the reference error, namely the error value of the output voltage of the solar battery and the reference voltage is smaller than or equal to the reference error, the output voltage of the solar battery is within a reasonable range.
In one embodiment of the present application, when the voltage error deviation degree needs to be determined, a difference value operation may be performed on the output voltage and the reference voltage based on the relationship between the output voltage and the reference voltage, to determine a difference value transportation result, where the difference value operation result is a voltage error value between the output voltage and the reference voltage; and then, according to the relation between the voltage error value and the reference error, performing difference operation on the voltage error value and the reference error, and determining a difference operation result, wherein the difference operation result is the deviation degree of the voltage error.
The solar cell 110 is configured to adjust the local output voltage according to the deviation of the voltage error, so as to ensure that the local output voltage is kept at the target voltage; the target voltage is determined from the reference voltage and the reference error.
When the local output voltage needs to be adjusted, the relationship between the local output voltage and the reference voltage can be determined according to the voltage error deviation degree, and if the local output voltage is determined to be greater than the reference voltage according to the voltage error deviation degree, the local output voltage needs to be reduced; if it is determined that the local output voltage is smaller than the reference voltage according to the degree of deviation of the voltage error, then the local output voltage needs to be raised.
Further, when the local output voltage needs to be reduced, the difference between the voltage error value and the reference error can be determined according to the deviation degree of the voltage error; therefore, the amount of voltage that reduces the local output voltage 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 of the output voltage and the reference voltage.
Further, when the local output voltage needs to be raised, the difference between the voltage error value and the reference error can be determined according to the deviation degree of the voltage error; therefore, the amount of voltage that steps up the local output voltage 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 of the output voltage and the reference voltage.
According to the voltage holding circuit, the acquisition of the output voltage of the solar battery is realized through the sampling circuit, a data basis is provided for the follow-up determination of the voltage error deviation degree according to the output voltage of the solar battery, the smooth proceeding of the follow-up flow is ensured, and the follow-up voltage adjustment can be performed on the local output voltage smoothly; the dual error amplifying circuit is used for determining the deviation degree of the voltage error according to the output voltage, the reference voltage and the reference error, obtaining the error of the output voltage of the solar cell, judging whether the output voltage of the solar cell needs to be adjusted or not, and determining the adjustment degree of the output voltage of the solar cell; the solar cell is used for adjusting the local output voltage according to the deviation degree of the voltage error, so that the output voltage is kept at the target voltage, the solar cell is ensured to maintain the maximum output power, and the resource acquisition efficiency of the solar cell is improved.
It should be noted that, fig. 3 is a block diagram of a second voltage holding circuit according to an embodiment of the present application, and as shown in fig. 3, the dual error amplifying circuit 130 includes: a first error amplifying circuit 131 and a second error amplifying circuit 132; the first error amplifying circuit 131 is connected to the second error amplifying circuit 132 and the sampling circuit 120, respectively; the second error amplifying circuit 132 is also connected to the solar cell 110.
The first error amplifying circuit 131 is configured to determine a voltage error value according to a relationship between the output voltage and the reference voltage, and transmit the voltage error value to the second error amplifying circuit 132.
The voltage error value is used for representing the difference value between the output voltage and the reference voltage; it can be understood that the larger the voltage error value is, the larger the error between the output voltage and the reference voltage is; the smaller the voltage error value, the smaller the error of the output voltage from the reference voltage.
Further, the voltage error value may be either a positive value or a negative value, and when the voltage error value is a positive value, the difference operation result obtained by carrying out the difference transportation on the output voltage and the reference voltage is a positive value, that is, the output voltage is greater than the reference voltage; when the voltage error value is a negative value, the difference operation result obtained by carrying out difference transportation on the output voltage and the reference voltage is a negative value, namely that the output voltage is smaller than the reference voltage.
The second error amplifying circuit 132 is configured to determine a voltage error deviation degree according to a relationship between the voltage error value and the reference error, and transmit the voltage error deviation degree to the solar cell 110.
In an embodiment of the present application, when the voltage error deviation needs to be determined, a difference operation may be performed on the voltage error value and the reference error, so as to determine a difference operation result, where the difference operation result is the voltage error deviation.
It should be noted that, the voltage error deviation degree may be either a positive value or a negative value, and when the voltage error deviation degree is a positive value, it means that the difference value operation result obtained by carrying out the difference transportation on the voltage error value and the reference error is a positive value, that is, the voltage error value is greater than the reference error; when the deviation degree of the voltage error is a negative value, the difference operation result obtained by carrying out difference transportation on the voltage error value and the reference error is a negative value, namely the voltage error value is smaller than the reference error.
According to the voltage holding circuit, the voltage error value of the output voltage and the reference voltage is determined through the first error amplifying circuit, so that the follow-up voltage error deviation degree can be determined according to the voltage error value; the adjustment degree of the output voltage of the solar battery can be successfully determined, the accuracy of the adjustment of the output voltage of the solar battery is guaranteed, the output voltage is further guaranteed to be kept at the target voltage, the solar battery can maintain the maximum output power, and the resource acquisition efficiency of the solar battery is improved.
It should be noted that, fig. 4 is a block diagram of a third voltage holding circuit according to an embodiment of the present application, and as shown in fig. 4, the solar cell 110 includes: a modulation circuit 111 and an energy storage circuit 112; the modulation circuit 111 is connected to the tank circuit 112 and the second error amplifying circuit 130, respectively; the energy storage circuit 112 is connected with the sampling circuit 120;
the modulating circuit 111 is configured to adjust the duty ratio of the solar cell 110 according to the voltage error deviation value, and transmit the duty ratio to the energy storage circuit 112.
Wherein the solar cell may be a direct current-direct current, DC-DC, power supply.
Wherein the duty cycle of the solar cell 110 is used to adjust the output voltage of the solar cell 110, further illustrating that different output constant voltages of the solar cell 110 correspond to different duty cycles,
in an embodiment of the present application, when determining the voltage error deviation value, the voltage amount that the output voltage of the solar cell 110 needs to be adjusted may be determined according to the voltage error deviation value, and the duty cycle variation corresponding to the voltage amount that the output voltage of the solar cell 110 needs to be adjusted is determined according to the relationship between the output voltage of the solar cell 110 and the duty cycle, where the duty cycle variation is the adjustment amount required for adjusting the duty cycle of the solar cell 110.
In another embodiment of the present application, when determining the voltage error deviation value, a duty cycle corresponding to the output voltage of the current solar cell 110 may be determined; and determining a target duty ratio when the output voltage of the solar cell 110 is the target voltage, and determining a duty ratio variation corresponding to the voltage amount of the output voltage of the solar cell 110 to be regulated by performing a difference operation between the duty ratio and the target duty ratio, wherein the duty ratio variation is an adjustment amount required for adjusting the duty ratio of the solar cell 110.
Further, if the duty ratio variation is a positive value, it means that the duty ratio and the target duty ratio are subjected to a difference operation, and the obtained difference operation result is a positive value, that is, the duty ratio is larger than the target duty ratio, so that when the duty ratio of the solar cell 110 is adjusted subsequently, the duty ratio of the solar cell 110 needs to be reduced; if the duty cycle variation is negative, it means that the duty cycle and the target duty cycle are subjected to a difference operation, and the obtained difference operation result is negative, that is, the duty cycle is smaller than the target duty cycle, so that the duty cycle of the solar cell 110 needs to be raised when the duty cycle of the solar cell 110 is adjusted subsequently.
The tank circuit 112 is configured to regulate the local output voltage according to the duty cycle, so as to ensure that the local output voltage is maintained at the target voltage.
It should be noted that, when the local output voltage is adjusted, the tank circuit is specifically configured to: according to the duty ratio, adjusting the input current of the solar cell; and regulating the local output voltage according to the regulated input current to ensure that the local output voltage is kept at the target voltage.
In an embodiment of the present application, since the duty ratio of the solar cell 110 may directly affect the input current of the solar cell 110, when the local output voltage needs to be adjusted according to the duty ratio, the input current of the solar cell 110 is directly adjusted according to the duty ratio of the solar cell 110, and further, the solar cell 110 determines the output voltage corresponding to the adjusted input current according to the characteristic shown by the current-voltage curve of itself, so as to complete the adjustment of the local output voltage.
Further to the description, as shown in fig. 5, fig. 5 is a block diagram of a fourth voltage holding circuit according to an embodiment of the present application, where the tank circuit 112 includes a switch 1121, a switch control circuit 1122, and a tank 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;
the switch control circuit 1122 adjusts the state of the switch 1121 according to the duty ratio.
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, an adjustment amount of the output voltage needs to be determined according to the duty ratio, and then the state of the switch 1121 is controlled, so that the adjustment of the output voltage is realized;
in one embodiment of the present application, the adjustment amount for the output voltage is determined to be required according to the duty ratio, and the adjustment amount for the output voltage is determined to be an increase adjustment amount or a decrease adjustment amount; when the adjustment amount of the output voltage is the step-up adjustment amount, the state of the switch 1121 is adjusted to the voltage step-up state, thereby ensuring the step-up adjustment of the output voltage; when the adjustment amount of the output voltage is a decrease adjustment amount, the state of the switch 1121 is adjusted to a voltage decrease state, thereby ensuring the decrease adjustment of the output voltage.
The energy storage element 1123 is configured to adjust the output voltage to a target voltage according to the adjusted state of the switch 1121.
It should be noted that, the state of the switch 1121 directly affects the output voltage of the energy storage unit 1123; when the state of the switch 1121 is the voltage amplification state, the energy storage unit 1123 outputs a larger output voltage; when the switch 1121 is in a voltage-reduced state, the energy storage unit 1123 outputs a smaller output voltage.
According to the voltage holding device, the duty ratio of the solar battery is adjusted according to the voltage error deviation value through the modulation circuit, so that the follow-up adjustment of the local output voltage according to the duty ratio of the solar battery is ensured, the adjustment of the local output voltage is realized, the output voltage is ensured to be kept at the target voltage, the solar battery is ensured to maintain the maximum output power, and the resource acquisition efficiency of the solar battery is improved.
In one embodiment, as shown in fig. 6, fig. 6 is a flowchart of a voltage holding method provided in an embodiment of the present application, and a voltage holding method is provided, where the voltage holding method may include the following steps:
in step 601, the output voltage of the solar cell is obtained by the sampling circuit of the voltage holding circuit, and the output voltage is transmitted to the double error amplifying circuit.
Step 603, adjusting the local output voltage according to the deviation degree of the voltage error by using the solar cell of the voltage holding circuit to ensure that the local output voltage is kept at the target voltage; the target voltage is determined from the reference voltage and the reference error.
Wherein the solar cell is a direct current-direct current (DC-DC) power supply.
According to the voltage maintaining method, the acquisition of the output voltage of the solar battery is realized through the sampling circuit, a data basis is provided for the follow-up determination of the voltage error deviation degree according to the output voltage of the solar battery, the smooth proceeding of the follow-up flow is ensured, and the follow-up voltage adjustment can be performed on the local output voltage smoothly; the dual error amplifying circuit is used for determining the deviation degree of the voltage error according to the output voltage, the reference voltage and the reference error, obtaining the error of the output voltage of the solar cell, judging whether the output voltage of the solar cell needs to be adjusted or not, and determining the adjustment degree of the output voltage of the solar cell; the solar cell is used for adjusting the local output voltage according to the deviation degree of the voltage error, so that the output voltage is kept at the target voltage, the solar cell is ensured to maintain the maximum output power, and the resource acquisition efficiency of the solar cell is improved.
The degree of deviation of the voltage error transmitted to the solar cell may be determined by the voltage error value. Optionally, as shown in fig. 7, fig. 7 is a flowchart of a step of determining a deviation degree of a voltage error according to an embodiment of the present application. Specifically, determining the voltage error deviation may include the steps of:
in step 701, a voltage error value is determined by a first error amplifying circuit of the voltage holding circuit according to the relationship between the output voltage and the reference voltage, and the voltage error value is transmitted to a second error amplifying circuit.
According to the voltage holding method, the voltage error value of the output voltage and the reference voltage is determined through the first error amplifying circuit, so that the follow-up voltage error deviation degree can be determined according to the voltage error value; the adjustment degree of the output voltage of the solar battery can be successfully determined, the accuracy of the adjustment of the output voltage of the solar battery is guaranteed, the output voltage is further guaranteed to be kept at the target voltage, the solar battery can maintain the maximum output power, and the resource acquisition efficiency of the solar battery is improved.
The local output voltage can be adjusted by the duty ratio of the solar cell. Optionally, as shown in fig. 8, fig. 8 is a flowchart of a step of adjusting a local output voltage according to an embodiment of the present application. Specifically, adjusting the local output voltage may include the steps of:
The input current of the solar cell is adjusted according to the duty ratio; and regulating the local output voltage according to the regulated input current to ensure that the local output voltage is kept at the target voltage.
In one embodiment of the present application, a tank circuit includes a switch, a switch control circuit, and a tank element; the switch is respectively connected with the energy storage element and the modulation circuit; the switch control circuit is connected with the modulation circuit; the switch control circuit is used for adjusting the switch state according to the duty ratio; and the energy storage element is used for adjusting the output voltage to the target voltage according to the adjusted switch state.
According to the voltage maintaining method, the duty ratio of the solar battery is adjusted according to the voltage error deviation value through the modulation circuit, so that the follow-up adjustment of the local output voltage according to the duty ratio of the solar battery is ensured, the adjustment of the local output voltage is realized, the output voltage is ensured to be maintained at the target voltage, the solar battery is ensured to maintain the maximum output power, and the resource acquisition efficiency of the solar battery is improved.
In one embodiment of the present application, as shown in fig. 9, fig. 9 is a flowchart of another voltage maintaining method provided in the embodiment of the present application, when the local output voltage needs to be maintained at the target voltage, the method may specifically include the following steps:
In step 902, a voltage error value is determined by a first error amplifying circuit of the voltage holding circuit according to a relationship between the output voltage and the reference voltage, and the voltage error value is transmitted to a second error amplifying circuit.
In step 905, the local output voltage is adjusted according to the duty cycle by the tank circuit of the voltage holding circuit, so as to ensure that the local output voltage is kept at the target voltage.
The input current of the solar cell is adjusted according to the duty ratio; and regulating the local output voltage according to the regulated input current to ensure that the local output voltage is kept at the target voltage.
In one embodiment of the present application, a tank circuit includes a switch, a switch control circuit, and a tank element; the switch is respectively connected with the energy storage element and the modulation circuit; the switch control circuit is connected with the modulation circuit; the switch control circuit is used for adjusting the switch state according to the duty ratio; and the energy storage element is used for adjusting the output voltage to the target voltage according to the adjusted switch state.
According to the voltage maintaining method, the acquisition of the output voltage of the solar battery is realized through the sampling circuit, a data basis is provided for the follow-up determination of the voltage error deviation degree according to the output voltage of the solar battery, the smooth proceeding of the follow-up flow is ensured, and the follow-up voltage adjustment can be performed on the local output voltage smoothly; the dual error amplifying circuit is used for determining the deviation degree of the voltage error according to the output voltage, the reference voltage and the reference error, obtaining the error of the output voltage of the solar cell, judging whether the output voltage of the solar cell needs to be adjusted or not, and determining the adjustment degree of the output voltage of the solar cell; the solar cell is used for adjusting the local output voltage according to the deviation degree of the voltage error, so that the output voltage is kept at the target voltage, the solar cell is ensured to maintain the maximum output power, and the resource acquisition efficiency of the solar cell is improved.
It should be understood that, although the steps in the flowcharts related to the above embodiments are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples represent only a few embodiments of the present application, which are described in more detail and are not thereby to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application shall be subject to the appended claims.
Claims (10)
1. A voltage holding circuit, comprising: a solar cell, a sampling circuit and a double error amplifying circuit; the solar battery is connected with the double-error amplifying circuit, and the sampling circuit is respectively connected with the solar battery and the double-error amplifying circuit;
the sampling circuit is used for acquiring the output voltage of the solar battery and transmitting the output voltage to the double error amplifying circuit;
the dual error amplifying circuit is used for determining the voltage error deviation corresponding to the output voltage according to the output voltage, the reference voltage and the reference error and transmitting the voltage error deviation to the solar cell;
the solar battery is used for adjusting the local output voltage according to the voltage error deviation degree so as to ensure that the local output voltage is kept at a target voltage; the target voltage is determined from the reference voltage and the reference error.
2. The circuit of claim 1, wherein the dual error amplification circuit comprises: a first error amplifying circuit and a second error amplifying circuit; the first error amplifying circuit is respectively connected with the second error amplifying circuit and the sampling circuit; the second error amplifying circuit is also connected with the solar cell;
the first error amplifying circuit is used for determining the voltage error value according to the relation between the output voltage and the reference voltage and transmitting the voltage error value to the second error amplifying circuit;
the second error amplifying circuit is used for determining the voltage error deviation degree according to the relation between the voltage error value and the reference error and transmitting the voltage error deviation degree to the solar cell.
3. The circuit of claim 1, wherein the solar cell comprises: a modulation circuit and a tank circuit; the modulation circuit is respectively connected with the energy storage circuit and the second error amplifying circuit; the energy storage circuit is connected with the sampling circuit;
the modulating circuit is used for adjusting the duty ratio of the solar battery according to the voltage error deviation value and transmitting the duty ratio to the energy storage circuit;
and the energy storage circuit is used for adjusting the local output voltage according to the duty ratio so as to ensure that the local output voltage is kept at the target voltage.
4. A circuit according to claim 3, wherein the tank circuit is specifically configured to:
adjusting the input current of the solar cell according to the duty ratio;
and regulating the local output voltage according to the regulated input current to ensure that the local output voltage is kept at the target voltage.
5. The circuit of claim 3, wherein the tank circuit comprises a switch, a switch control circuit, and a tank element; the switch is respectively connected with the energy storage element and the modulation circuit; the switch control circuit is connected with the modulation circuit;
the switch control circuit is used for adjusting the switch state according to the duty ratio;
the energy storage element is used for adjusting the output voltage to be a target voltage according to the adjusted switch state.
6. The circuit of any one of claims 1 to 5, wherein the solar cell is a direct current-direct current, DC-DC, power supply.
7. A voltage holding method, characterized in that the method is performed by the voltage holding circuit according to any one of claims 1 to 6, the method comprising:
the output voltage of the solar battery is obtained through a sampling circuit of the voltage holding circuit, and the output voltage is transmitted to a double error amplifying circuit;
determining, by a double error amplification circuit of the voltage holding circuit, a voltage error deviation corresponding to the output voltage according to the output voltage, a reference voltage and a reference error, and transmitting the voltage error deviation to the solar cell;
the solar battery of the voltage holding circuit is used for adjusting the local output voltage according to the voltage error deviation degree so as to ensure that the local output voltage is kept at the target voltage; the target voltage is determined from the reference voltage and the reference error.
8. The method of claim 7, wherein the determining, by the double error amplification circuit of the voltage holding circuit, a voltage error deviation corresponding to the output voltage from the output voltage, a reference voltage, and a reference error, and transmitting the voltage error deviation to the solar cell, comprises:
determining, by a first error amplification circuit of the voltage holding circuit, the voltage error value according to a relationship between the output voltage and the reference voltage, and transmitting the voltage error value to a second error amplification circuit;
and determining, by the second error amplification circuit of the voltage holding circuit, the voltage error deviation according to the relationship between the voltage error value and the reference error, and transmitting the voltage error deviation to the solar cell.
9. The method of claim 7, wherein the solar cell passing through the voltage holding circuit adjusts a 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, and comprises the following steps:
the modulating circuit is used for adjusting the duty ratio of the solar battery according to the voltage error deviation value and transmitting the duty ratio to the energy storage circuit;
and the energy storage circuit is used for adjusting the local output voltage according to the duty ratio so as to ensure that the local output voltage is kept at the target voltage.
10. The method of claim 9, wherein the step of adjusting the local output voltage to ensure that the local output voltage remains at the target voltage based on the duty cycle comprises:
adjusting the input current of the solar cell according to the duty ratio;
and regulating the local output voltage according to the regulated input current to ensure that the local output voltage is kept at the target voltage.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310012453.5A CN116027839A (en) | 2023-01-05 | 2023-01-05 | Voltage holding circuit and method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310012453.5A CN116027839A (en) | 2023-01-05 | 2023-01-05 | Voltage holding circuit and method thereof |
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| CN116027839A true CN116027839A (en) | 2023-04-28 |
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| CN202310012453.5A Pending CN116027839A (en) | 2023-01-05 | 2023-01-05 | Voltage holding circuit and method thereof |
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| CN (1) | CN116027839A (en) |
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- 2023-01-05 CN CN202310012453.5A patent/CN116027839A/en active Pending
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