CN110224594B - Output voltage control method and device of direct current voltage reduction circuit - Google Patents
Output voltage control method and device of direct current voltage reduction circuit Download PDFInfo
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- CN110224594B CN110224594B CN201910629439.3A CN201910629439A CN110224594B CN 110224594 B CN110224594 B CN 110224594B CN 201910629439 A CN201910629439 A CN 201910629439A CN 110224594 B CN110224594 B CN 110224594B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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Abstract
The embodiment of the application provides an output voltage control method and device of a direct current voltage reduction circuit, and belongs to the technical field of power electronics. The method comprises the steps of obtaining a compensation coefficient and a compensation reference according to the corresponding relation between the input voltage and the output voltage of the direct-current voltage reduction circuit; compensating the initial electrifying time length of the direct current voltage reduction circuit according to the compensation coefficient and the compensation reference to obtain the compensation electrifying time length; and controlling the output voltage in the direct current voltage reduction circuit according to the compensation electrifying time. According to the embodiment of the application, the output voltage can be compensated by controlling the on-off duration of the switching device under the condition that the output voltage of the direct current voltage reduction circuit cannot be detected, so that the purpose of stabilizing the output voltage is achieved.
Description
Technical Field
The embodiment of the application relates to the technical field of power electronics, in particular to an output voltage control method and device of a direct current voltage reduction circuit.
Background
In practical applications, voltage conversion is often required to meet the power supply requirements of various electrical appliances or circuit elements. The alternating voltage is converted by mainly utilizing the characteristic that the turn ratio of two ends of the transformer is equal to the voltage ratio of the two ends of the transformer; the conversion of the dc voltage is mainly performed by chopping.
In a dc chopper circuit, detection of an input voltage and an output voltage is generally required to perform accurate control of the voltage. However, when the AD port of the chip itself is not sufficient or the size of the hardware circuit itself is limited, the output voltage feedback circuit is often not available, and thus the output voltage cannot be detected, and the voltage cannot be accurately controlled.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a method and an apparatus for controlling an output voltage of a dc voltage-reducing circuit, which are used to compensate an output voltage by controlling an on-off duration of a switching device when the output voltage of the dc voltage-reducing circuit cannot be detected, so as to stabilize the output voltage.
In a first aspect, an embodiment of the present application provides an output voltage control method for a dc voltage reduction circuit, including: obtaining a compensation coefficient and a compensation reference according to the corresponding relation between the input voltage and the output voltage of the direct current voltage reduction circuit;
compensating the initial electrifying time length of the direct current voltage reduction circuit according to the compensation coefficient and the compensation reference to obtain the compensation electrifying time length;
controlling the output voltage in the direct current voltage reduction circuit according to the compensation electrifying duration;
and the initial electrifying time length is obtained according to the duty ratio and the carrier period of a switching device in the direct current voltage reduction circuit.
Optionally, in this embodiment of the present application based on the first aspect, the energization time duration is compensatedoutThe formula of (1) is:
dutyout＝duty+Kgain*(Vin-Vzero)
wherein duty is the initial power-on duration of the DC step-down circuit, KgainTo compensate for the coefficient, VzeroTo compensate for the reference, VinThe input voltage of the direct current voltage reduction circuit.
Optionally, in an embodiment of the present application based on the first aspect, the step of obtaining the compensation coefficient and the compensation reference according to the corresponding relationship between the input voltage and the output voltage of the dc voltage reduction circuit specifically includes:
measuring the input voltage and the output voltage of the direct current voltage reduction circuit by using voltage measuring equipment to obtain at least two groups of measured values;
and obtaining a compensation coefficient and a compensation reference according to the at least two groups of measured values.
Optionally, in an embodiment of the present application based on the first aspect, the step of obtaining the compensation coefficient and the compensation reference according to the at least two groups of measured values specifically includes:
fitting a linear equation of unity according to the at least two groups of measured values;
determining the slope of the linear equation of a unary as a compensation coefficient, and determining the intercept of the linear equation of a unary as a compensation reference.
Optionally, in an embodiment of the present application based on the first aspect, the step of controlling the output voltage in the dc step-down circuit according to the compensated power-on duration includes:
controlling the on-off time of a switching element in the direct current voltage reduction circuit by utilizing pulse width modulation according to the compensation power-on duration;
and controlling the output voltage in the direct current voltage reduction circuit according to the on-off time of the switching element.
In a second aspect, the present application further provides an output voltage control apparatus of a dc voltage reduction circuit, the apparatus includes a compensation coefficient and compensation reference module, a compensation energization time period module, and an output voltage control module, wherein,
the compensation coefficient and compensation reference module is connected with the compensation electrifying duration module and is used for obtaining a compensation coefficient and a compensation reference according to the corresponding relation between the input voltage and the output voltage of the direct current voltage reduction circuit and sending the obtained compensation coefficient and compensation reference to the compensation electrifying duration module;
the compensation power-on duration module is connected with the compensation coefficient and compensation reference module and the output voltage control module, and is used for compensating the initial power-on duration of the direct current voltage reduction circuit according to the received compensation coefficient and the received compensation reference to obtain compensation power-on duration and sending the compensation power-on duration to the output voltage control module;
the output voltage control module is connected with the compensation electrifying duration module and is used for controlling the output voltage in the direct current voltage reduction circuit according to the received compensation electrifying duration;
and the initial electrifying time length is obtained according to the duty ratio and the carrier period of a switching device in the direct current voltage reduction circuit.
Optionally, in an embodiment of the present application based on the second aspect, the energization time duration is compensatedoutThe formula of (1) is:
dutyout＝duty+Kgain*(Vin-Vzero)
wherein duty is the initial power-on duration of the DC step-down circuit, KgainTo compensate for the coefficient, VzeroTo compensate for the reference, VinThe input voltage of the direct current voltage reduction circuit.
Optionally, in an embodiment of the present application based on the second aspect, the step of obtaining the compensation coefficient and the compensation reference by the compensation coefficient and compensation reference module according to a corresponding relationship between the input voltage and the output voltage of the dc voltage reduction circuit specifically includes:
measuring the input voltage and the output voltage of the direct current voltage reduction circuit by using voltage measuring equipment to obtain at least two groups of measured values;
and obtaining a compensation coefficient and a compensation reference according to the at least two groups of measured values.
Optionally, in an embodiment of the present application based on the second aspect, the step of obtaining the compensation coefficient and the compensation reference according to the at least two groups of measured values specifically includes:
fitting a linear equation of unity according to the at least two groups of measured values;
determining the slope of the linear equation of a unary as a compensation coefficient, and determining the intercept of the linear equation of a unary as a compensation reference.
Optionally, in an embodiment of the present application based on the second aspect, the step of controlling, by the output voltage control module, the output voltage in the dc step-down circuit according to the compensation energization time period includes:
controlling the on-off time of a switching element in the direct current voltage reduction circuit by utilizing pulse width modulation according to the compensation power-on duration;
and controlling the output voltage in the direct current voltage reduction circuit according to the on-off time of the switching element.
According to the technical scheme, under the condition that the output voltage feedback circuit is lacked in the direct current voltage reduction circuit due to insufficient AD ports of the chip or limited size of the hardware circuit, the embodiment of the application can compensate the electrifying duration of the switching device in the direct current voltage reduction circuit based on the input voltage of the direct current voltage reduction circuit, namely compensate the high level duration in pulse width modulation, further control the stability of the output voltage by controlling the on-off time of the switching device in the direct current voltage reduction circuit, namely control the required output voltage no matter how the input voltage in the direct current voltage reduction circuit changes.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the embodiments of the present application, and other drawings can be obtained by those skilled in the art according to the drawings.
Fig. 1 is a schematic flowchart of an output voltage control method of a dc voltage reduction circuit according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a DC chopper voltage-reducing circuit according to an embodiment of the present disclosure;
FIG. 3 is a circuit diagram of an input voltage sampling circuit according to an embodiment of the present application;
fig. 4 is a functional block diagram of an output voltage control apparatus of a dc voltage reduction circuit according to an embodiment of the present disclosure.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application shall fall within the scope of the protection of the embodiments in the present application.
In the prior art, generally, a circuit for performing voltage variation has a voltage feedback circuit, and the voltage feedback circuit is used for detecting an output voltage so as to accurately control the output voltage. However, due to the limitation of hardware, in some cases, the output voltage cannot be detected, and thus the output voltage cannot be accurately controlled, and based on this situation, the embodiment of the present application provides an output voltage control method for a dc voltage reduction circuit, as shown in fig. 1, including steps S100 to S300, specifically:
s100: and obtaining a compensation coefficient and a compensation reference according to the corresponding relation between the input voltage and the output voltage of the direct current voltage reduction circuit.
The circuit shown in fig. 2 is a dc voltage-reducing circuit, and the obtained output voltage is not a stable value due to voltage division of other elements in the dc voltage-reducing circuit and charge-discharge characteristics of a capacitor, but the output voltage is increased along with the increase of the input voltage; as the input voltage decreases, the output voltage also decreases. Therefore, the embodiment of the application compensates the initial power-on duration duty of the dc voltage reduction circuit according to the input voltage to achieve the purpose of compensating the output voltage, so that a stable output voltage can be obtained no matter how the input voltage in the dc voltage reduction circuit changes.
For a dc buck circuit, the relationship between the input voltage Vin and the desired output voltage Vout, and the carrier period can be expressed by the following equation:
wherein the duty is the initial power-on duration of the DC voltage reduction circuit,
may be used to represent the duty cycle of the switching device (e.g., Q1 in fig. 2) in the dc buck circuit.
In practical application, on one hand, the resistance and the inductance in the circuit have certain voltage division, but the part of the voltage division is not represented in the formula; on the other hand, the capacitor in the circuit has charge and discharge characteristics, namely, when the voltage difference is large, the charging speed is high, and when the voltage difference is small, the charging speed is slow, namely, when the input voltage is high, the time for charging to the target output voltage is short; when the input voltage is low, the time for charging to the target output voltage is long, but the change in the charging speed is not considered in the above calculation formula.
Theoretically, the compensation for the initial energization time duration is an exponential compensation, which is related to the magnitude of the capacitance and the inductance, the characteristics of the load, and the like, but considering the characteristics of the chopping time and in the case of t → 0, the exponential function can be approximated as follows:
therefore, the compensation of the initial energization time duration can be regarded as a linear compensation, and the initial energization time duration is compensated through the determined compensation coefficient and the compensation reference in the embodiment of the present application.
In an exemplary embodiment, the step of obtaining the compensation coefficient and the compensation reference includes:
measuring the input voltage and the output voltage of the direct current voltage reduction circuit by using voltage measuring equipment to obtain at least two groups of measured values;
and obtaining a compensation coefficient and a compensation reference according to at least two groups of measured values.
In practical operation, before compensating for the initial power-on duration duty of the dc voltage reduction circuit, input voltage and output voltage of the dc voltage reduction circuit are measured by using a voltage measurement device other than the dc voltage reduction circuit, such as a multimeter or a dc digital voltmeter, to obtain at least two sets of input voltage and output voltage pairs, and then a compensation coefficient and a compensation reference are obtained according to the at least two sets of input voltage and output voltage pairs. In actual operation, as shown in fig. 3, the input voltage of the dc voltage down circuit may be divided and sampled at a certain sampling period through the V _ sample port, and the sampled V _ sample of the input voltage is obtained as the measured value of the input voltage.
In an exemplary embodiment, a one-dimensional equation of the form is fitted based on at least two sets of measurements; determining the slope of the unary linear equation as a compensation coefficient, and determining the intercept of the unary linear equation as a compensation reference.
Specifically, assuming that five sets of measured values of the input voltage and the output voltage are obtained, the measured values of the input voltage and the output voltage are (xi, yi), wherein i is 1-5. Assuming that the unary equation is y ═ kx + b, and x ═ x1+ x2+ x3+ x4+ x5)/5, and y ═ y1+ y2+ y3+ y4+ y5)/5 are average numbers, the junction is fittedThe fruit is as follows: k ═ Σ (xi-x ') (yi-y ')/∑ (xi-x ') ^2, b ═ y ' -kx '. Thus, K can be determined as the compensation coefficient KgainB is a compensation reference Vzero。
Determining a compensation factor KgainAnd a compensation reference VzeroThen, step S200 is executed:
and compensating the initial electrifying time length of the direct current voltage reduction circuit according to the compensation coefficient and the compensation reference to obtain the compensation electrifying time length.
Compensating for power-on duration dutyoutThe formula of (1) is:
dutyout＝duty+Kgain*(Vin-Vzero)
wherein duty is the initial power-on duration of the DC step-down circuit, KgainTo compensate for the coefficient, VzeroTo compensate for the reference, VinThe input voltage of the direct current voltage reduction circuit.
By compensating the energization time period of the dc voltage reduction circuit, the portion of the output voltage that varies with the variation of the input voltage is cancelled out, so that a stable voltage output can be obtained.
S300: and controlling the output voltage in the direct current voltage reduction circuit according to the compensation electrifying time.
In an exemplary embodiment, the step of controlling the output voltage in the dc voltage reduction circuit according to the compensated power-on duration is: controlling the on-off time of a switching element in the direct current voltage reduction circuit by utilizing pulse width modulation according to the compensation power-on duration; and controlling the output voltage in the direct current voltage reduction circuit according to the on-off time of the switching device.
Specifically, as shown in fig. 2, the on-off time of the switching device Q1 can be controlled by pulse width modulation according to the compensation power-on duration, so as to complete the voltage chopping control of the voltages at the two ends of Vout + and Vout-in the dc voltage-reducing circuit.
Based on the same inventive concept, as shown in fig. 4, the embodiment of the present application further provides an output voltage control apparatus 400 of a dc voltage reduction circuit, which includes a compensation coefficient and compensation reference module 401, a compensation energization time period module 402, and an output voltage control module 403, wherein,
the compensation coefficient and compensation reference module 401 is connected to the compensation power-on duration module 402, and is configured to obtain a compensation coefficient and a compensation reference according to a correspondence between an input voltage and an output voltage of the dc voltage reduction circuit, and send the obtained compensation coefficient and compensation reference to the compensation power-on duration module 402;
the compensation power-on duration module 402 is connected to the compensation coefficient and compensation reference module 401 and the output voltage control module 403, and is configured to compensate the initial power-on duration of the dc voltage-drop circuit according to the received compensation coefficient and compensation reference, obtain a compensation power-on duration, and send the compensation power-on duration to the output voltage control module 403;
the output voltage control module 403 is connected to the compensation power-on duration module 402, and is configured to control the output voltage in the dc voltage reduction circuit according to the received compensation power-on duration;
the initial electrifying duration is obtained according to the duty ratio and the carrier period of a switching device in the direct-current voltage reduction circuit.
In an exemplary embodiment, the power-on duration duty is compensatedoutThe formula of (1) is:
dutyout＝duty+Kgain*(Vin-Vzero)
wherein duty is the initial power-on duration of the DC step-down circuit, KgainTo compensate for the coefficient, VzeroTo compensate for the reference, VinThe input voltage of the direct current voltage reduction circuit.
In an exemplary embodiment, the step of obtaining the compensation coefficient and the compensation reference by the compensation coefficient and compensation reference module 401 according to the corresponding relationship between the input voltage and the output voltage of the dc voltage-reducing circuit is specifically as follows:
measuring the input voltage and the output voltage of the direct current voltage reduction circuit by using voltage measuring equipment to obtain at least two groups of measured values;
and obtaining a compensation coefficient and a compensation reference according to at least two groups of measured values.
In an exemplary embodiment, the step of obtaining the compensation coefficient and the compensation reference according to at least two groups of measured values specifically includes:
fitting a linear equation of unity according to at least two groups of measured values;
determining the slope of the unary linear equation as a compensation coefficient, and determining the intercept of the unary linear equation as a compensation reference.
In an exemplary embodiment, the step of controlling the output voltage in the dc voltage reduction circuit by the output voltage control module 403 according to the compensation power-on duration is:
controlling the on-off time of a switching element in the direct current voltage reduction circuit by utilizing pulse width modulation according to the compensation power-on duration;
and controlling the output voltage in the direct current voltage reduction circuit according to the on-off time of the switching device.
The compensation coefficient and compensation reference module 401, the compensation energization time period module 402 and the output voltage control module 403 in the embodiment of the present application are used for executing the steps in the embodiment of the method described above.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative functional modules and method steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, the division of the above-described modules or units is only one type of division of logical functions, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
The integrated unit may be stored in a computer-readable storage medium if it is implemented in the form of a software functional unit and sold or used as a separate product. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium and can implement the steps of the embodiments of the method when the computer program is executed by a processor. The computer program includes computer program code, and the computer program code may be in a source code form, an object code form, an executable file or some intermediate form. The computer-readable storage medium may include: any entity or device capable of carrying the above-mentioned computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signal, telecommunication signal, software distribution medium, etc. It should be noted that the computer readable storage medium may contain content that is subject to appropriate increase or decrease according to the requirements of legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable storage media does not include electrical carrier signals and telecommunication signals according to legislation and patent practice.
The above embodiments are only for illustrating the technical solutions of the present invention, and not for limiting the same. While preferred embodiments of the present application have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the true scope of the embodiments of the application. It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present application without departing from the spirit and scope of the embodiments of the present application. Thus, if such modifications and variations of the embodiments of the present application fall within the scope of the claims of the embodiments of the present application and their equivalents, the embodiments of the present application are intended to include such modifications and variations as well.
Claims (8)
1. An output voltage control method of a DC step-down circuit is characterized by comprising the following steps:
obtaining a compensation coefficient and a compensation reference according to the corresponding relation between the input voltage and the output voltage of the direct current voltage reduction circuit;
compensating the initial electrifying time length of the direct current voltage reduction circuit according to the compensation coefficient and the compensation reference to obtain the compensation electrifying time length;
controlling the output voltage in the direct current voltage reduction circuit according to the compensation electrifying duration;
the initial electrifying duration is obtained according to the duty ratio and the carrier period of a switching device in the direct current voltage reduction circuit;
compensating for power-on duration dutyoutThe formula of (1) is:
dutyout＝duty+Kgain*(Vin-Vzero)
wherein duty is the initial power-on duration of the DC step-down circuit, KgainTo compensate for the coefficient, VzeroTo compensate for the reference, VinThe input voltage of the direct current voltage reduction circuit.
2. The output voltage control method of the DC voltage step-down circuit according to claim 1,
the step of obtaining a compensation coefficient and a compensation reference according to the corresponding relationship between the input voltage and the output voltage of the dc voltage reduction circuit specifically comprises:
measuring the input voltage and the output voltage of the direct current voltage reduction circuit by using voltage measuring equipment to obtain at least two groups of measured values;
and obtaining a compensation coefficient and a compensation reference according to the at least two groups of measured values.
3. The method according to claim 2, wherein the step of obtaining the compensation coefficient and the compensation reference according to the at least two sets of measured values comprises:
fitting a linear equation of unity according to the at least two groups of measured values;
determining the slope of the linear equation of a unary as a compensation coefficient, and determining the intercept of the linear equation of a unary as a compensation reference.
4. The method according to claim 1, wherein the step of controlling the output voltage of the dc step-down circuit according to the compensated power-on duration comprises:
controlling the on-off time of a switching element in the direct current voltage reduction circuit by utilizing pulse width modulation according to the compensation power-on duration;
and controlling the output voltage in the direct current voltage reduction circuit according to the on-off time of the switching element.
5. An output voltage control device of a direct current voltage reduction circuit is characterized by comprising a compensation coefficient and compensation reference module, a compensation electrifying time length module and an output voltage control module, wherein,
the compensation coefficient and compensation reference module is connected with the compensation electrifying duration module and is used for obtaining a compensation coefficient and a compensation reference according to the corresponding relation between the input voltage and the output voltage of the direct current voltage reduction circuit and sending the obtained compensation coefficient and compensation reference to the compensation electrifying duration module;
the compensation power-on duration module is connected with the compensation coefficient and compensation reference module and the output voltage control module, and is used for compensating the initial power-on duration of the direct current voltage reduction circuit according to the received compensation coefficient and the received compensation reference to obtain compensation power-on duration and sending the compensation power-on duration to the output voltage control module;
the output voltage control module is connected with the compensation electrifying duration module and is used for controlling the output voltage in the direct current voltage reduction circuit according to the received compensation electrifying duration;
the initial electrifying duration is obtained according to the duty ratio and the carrier period of a switching device in the direct current voltage reduction circuit;
compensating for power-on duration dutyoutThe formula of (1) is:
dutyout＝duty+Kgain*(Vin-Vzero)
wherein duty is the initial power-on duration of the DC step-down circuit, KgainTo compensate for the coefficient, VzeroTo compensate for the reference, VinThe input voltage of the direct current voltage reduction circuit.
6. The output voltage control device of the DC voltage-reducing circuit according to claim 5,
the step of obtaining the compensation coefficient and the compensation reference by the compensation coefficient and compensation reference module according to the corresponding relation between the input voltage and the output voltage of the direct current voltage reduction circuit specifically comprises the following steps:
measuring the input voltage and the output voltage of the direct current voltage reduction circuit by using voltage measuring equipment to obtain at least two groups of measured values;
and obtaining a compensation coefficient and a compensation reference according to the at least two groups of measured values.
7. The output voltage control device of the DC voltage-reducing circuit according to claim 6,
the step of obtaining a compensation coefficient and a compensation reference according to the at least two groups of measurement values specifically comprises:
fitting a linear equation of unity according to the at least two groups of measured values;
determining the slope of the linear equation of a unary as a compensation coefficient, and determining the intercept of the linear equation of a unary as a compensation reference.
8. The output voltage control device of the DC voltage-reducing circuit according to claim 5,
the step of controlling the output voltage in the direct current voltage reduction circuit by the output voltage control module according to the compensation electrifying duration is as follows:
controlling the on-off time of a switching element in the direct current voltage reduction circuit by utilizing pulse width modulation according to the compensation power-on duration;
and controlling the output voltage in the direct current voltage reduction circuit according to the on-off time of the switching element.
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