CN114070040A - Direct-current power supply and method for improving output voltage precision of direct-current power supply - Google Patents
Direct-current power supply and method for improving output voltage precision of direct-current power supply Download PDFInfo
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- CN114070040A CN114070040A CN202010776156.4A CN202010776156A CN114070040A CN 114070040 A CN114070040 A CN 114070040A CN 202010776156 A CN202010776156 A CN 202010776156A CN 114070040 A CN114070040 A CN 114070040A
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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
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
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Abstract
The invention discloses a direct current power supply and a method for improving the accuracy of output voltage of the direct current power supply, wherein the direct current power supply comprises the following components: the reference direct current power supply module is used for providing a first reference voltage and a second reference voltage; the voltage division module is connected with the reference direct current power supply module and used for dividing the first reference voltage to generate a first output voltage; the voltage follower module is connected with the output end of the voltage division module, receives the first output voltage and generates a second output voltage; and the adding module is used for obtaining the sum of the second reference voltage and the second output voltage to generate a target output voltage, wherein the first output voltage is smaller than the first reference voltage, and the first output voltage and the first reference voltage are in different magnitudes. The invention can improve the precision of the output voltage of the direct current power supply.
Description
Technical Field
The invention relates to the technical field of power supplies, in particular to a direct-current power supply and a method for improving the output voltage precision of the direct-current power supply.
Background
In electronic laboratories, dc power supplies are commonly used to provide dc test voltages for different test products. With the continuous development of scientific technology, the precision requirement of the direct current test voltage required by the test of various high-precision products is higher and higher.
The output voltage precision of the direct current power supply on the current general market is low, mostly in millivolt (such as 1mV) level, and the requirement on voltage precision is high, so that the direct current power supply cannot be realized when a test experiment of providing microvolt (such as 20uV) level voltage is required.
Therefore, there is a need to provide an improved technical solution to overcome the above technical problems in the prior art.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a dc power supply and a method for improving the accuracy of the output voltage of the dc power supply, which can improve the accuracy of the output voltage of the dc power supply.
According to the present invention, there is provided a direct current power supply comprising: the reference direct current power supply module is used for providing a first reference voltage and a second reference voltage; the voltage division module is connected with the reference direct current power supply module and used for dividing the first reference voltage to generate a first output voltage; the voltage follower module is connected with the output end of the voltage division module, receives the first output voltage and generates a second output voltage; and the adding module is used for obtaining the sum of the second reference voltage and the second output voltage to generate a target output voltage, wherein the first output voltage is smaller than the first reference voltage, and the first output voltage and the first reference voltage are in different magnitudes.
Preferably, the voltage dividing module includes: a plurality of resistors, wherein a part of the resistors are connected in series between the first reference voltage input terminal and a first node, another part of the resistors are connected in parallel between the first node and a ground terminal, and a voltage at the first node is the first output voltage.
Preferably, the resistances of the plurality of resistors are the same.
Preferably, the voltage follower module comprises: the first input end of the operational amplifier receives the first output voltage, the second input end of the operational amplifier is connected with the output end, and the output end of the operational amplifier outputs the second output voltage; the first capacitor is connected between the first power supply end and the grounding end of the operational amplifier; and the second capacitor is connected between the second power supply end and the grounding end of the operational amplifier.
Preferably, the adding module comprises an adder, a first input of the adder receiving the second reference voltage, and a second input of the adder receiving the second output voltage.
The method for improving the accuracy of the output voltage of the direct-current power supply comprises the following steps: generating a first reference voltage and a second reference voltage by a reference direct current power supply module; dividing the first reference voltage by a voltage dividing module to generate a first output voltage; buffering and isolating the first output voltage by a voltage follower module to generate a second output voltage; and adding and summing the second reference voltage and the second output voltage by an adding module to obtain a target output voltage, wherein the first output voltage is smaller than the first reference voltage, and the first output voltage and the first reference voltage are in different magnitudes.
Preferably, the voltage dividing module comprises a plurality of resistors with the same resistance value.
Preferably, the dividing the first reference voltage by the voltage dividing module to generate the first output voltage includes: connecting part of the resistors with the same resistance value in series between the first reference voltage input end and a first node; connecting another part of the resistors with the same resistance value in parallel between the first node and a ground terminal; outputting the first output voltage from the first node.
Preferably, before the adding the second reference voltage and the second output voltage by the adding module, the method further comprises: and changing the voltage value of the first reference voltage generated by the reference direct-current power supply module, measuring and judging whether the variation of the second output voltage meets the precision requirement of the output voltage of the direct-current power supply, and adjusting the voltage division ratio of the voltage division module under the condition that the variation of the second output voltage does not meet the precision requirement of the output voltage of the direct-current power supply.
Preferably, before the generating the first reference voltage and the second reference voltage by the reference dc power supply module, the method further includes: after the preset use times or time are spaced, the voltage value of the output end of the voltage follower module is measured in an idle mode, and the offset of the direct-current power supply is obtained; and obtaining the voltage value of the first reference voltage which is actually required to be generated by the reference direct-current power supply based on the offset.
The invention has the beneficial effects that: the invention discloses a direct-current power supply and a method for improving the precision of output voltage of the direct-current power supply, wherein one path of voltage, namely first reference voltage, in two paths of reference voltages generated by a reference direct-current power supply module is divided by a voltage dividing module, so that first output voltage which is smaller than the first reference voltage and is in different magnitude levels from the first reference voltage is obtained, and a target output voltage is obtained based on the first output voltage and the other path of voltage in the two paths of reference voltages generated by the reference direct-current power supply module, so that the precision of the output voltage of the direct-current power supply is improved. Meanwhile, the voltage follower module is adopted to buffer and isolate the divided voltage, so that the divided output voltage is not influenced by the post-stage output impedance, and the stability of the output voltage of the direct-current power supply is improved on the premise of realizing high precision of the output voltage of the direct-current power supply.
The voltage division is performed by adopting a mode of combining a plurality of resistors with the same resistance in series-parallel connection, so that the high matching degree of each resistor in the voltage division module is realized, the influence on the voltage division ratio due to different errors of the resistance values of the plurality of resistors is reduced, the accuracy of the voltage division result of the first reference voltage is enhanced, and the precision of the output voltage of the direct-current power supply is further improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 is a system block diagram of a dc power supply provided by an embodiment of the invention;
fig. 2 is a circuit diagram illustrating a voltage dividing module and a voltage follower module in a dc power supply according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating a method for improving the accuracy of the output voltage of the dc power supply according to an embodiment of the present invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The present invention will be described in detail below with reference to the accompanying drawings.
Fig. 1 shows a system block diagram of a dc power supply provided in an embodiment of the present invention, and fig. 2 shows a circuit structure diagram of a voltage dividing module and a voltage follower module in the dc power supply provided in the embodiment of the present invention.
As shown in fig. 1, in the present embodiment, the dc power supply is used to obtain a target output voltage with high precision required by a test, an experiment, and the like, and includes: a reference dc power module 100, a voltage divider module 200, a voltage follower module 300, and an adder module 400.
The reference dc power module 100 is configured to provide a first reference voltage V1 and a second reference voltage V2. The first reference voltage V1 and the second reference voltage V2 provided by the reference dc power module 100 are two paths of output voltages that do not affect each other, and the voltage accuracies of the first reference voltage V1 and the second reference voltage V2 are all in millivolt level.
Preferably, when obtaining the target output voltage with high precision, only one of the first reference voltage V1 and the second reference voltage V2 provided by the reference dc power supply module 100 is divided, wherein the other one can be used as a low-precision part of the target output voltage, and then added to a high-precision part of the target output voltage obtained after voltage division, so as to obtain the target output voltage with high precision, and thus the complexity of obtaining the target output voltage can be reduced. However, it should be understood that the scheme of dividing the first reference voltage V1 and the second reference voltage V2 provided by the reference dc power module 100 at the same time and then adding them together to obtain the target output voltage also falls within the protection scope of the present invention.
The voltage dividing module 200 is connected to the reference dc power module 100, and is configured to divide the first reference voltage V1 to generate a first output voltage V3.
In this embodiment, the voltage divider module 200 includes a plurality of resistors. Some of the resistors are connected in series between the input terminal of the first reference voltage V1 and the first node a, and another part of the resistors are connected in parallel between the first node a and the ground terminal. The first node a corresponds to the voltage divider module 200 to obtain an output node, and the voltage at the first node a is the first output voltage V3.
Further, the voltage value of the first output voltage V3 is smaller than that of the first reference voltage V1, and the first output voltage V3 is at a different magnitude from the first reference voltage V1.
Preferably, the resistances of the resistors in the voltage dividing module 200 are all the same.
For example, as shown in fig. 2, the plurality of resistors in the voltage dividing module 200 include a first resistor R1 to a fourteenth resistor R14 (assuming that the resistance of each resistor is R). The first resistor R1 to the seventh resistor R7 are connected in series between the input end of the first reference voltage V1 and the first node a, and the eighth resistor R8 to the fourteenth resistor R14 are connected in parallel between the first node a and the ground, so as to divide the first reference voltage V1. The divided voltage at the first node a, i.e. the first output voltage V3, is:
in this way, the voltage division of the first reference voltage V1 can be realized at a voltage division ratio of one fiftieth, that is, when the accuracy of the first reference voltage V1 provided by the reference dc power supply module 100 is 1mV, the accuracy of the first output voltage V3 obtained after the voltage division is 20 uV. In this embodiment, the first reference voltage V1 is divided by combining series connection and parallel connection of a plurality of resistors with the same resistance value and high matching degree, the dividing ratio is irrelevant to the resistance value of the selected resistor and is only relevant to the series-parallel connection of a plurality of voltages, and by adjusting the number of the plurality of resistors with the same resistance value and designing different series-parallel connection modes, voltage dividing modules with different dividing ratios such as one percent and one thousandth can be realized, and direct current power supplies with different precision requirements can be realized, thereby meeting various different testing and experimental requirements.
Based on the above description, in this embodiment, the mode that a plurality of resistors with the same resistance are connected in series and in parallel are used for voltage division, so that different voltage division ratios can be realized, various different testing and experiment requirements can be met, and the application range is widened. Meanwhile, the high matching degree of each resistor in the voltage division module is realized, the influence on the voltage division ratio due to different errors of the resistance values of the plurality of resistors is reduced, the accuracy of the voltage division result of the first reference voltage is enhanced, and the precision of the output voltage of the direct-current power supply is further improved.
It should be noted that, in the present application, the voltage division ratio can be realized by simply connecting resistors with different resistance values in series to divide the first reference voltage V1, and although an error may be caused to the dc power supply, as an alternative embodiment, the invention is also within the protection scope of the present invention.
The voltage follower module 300 is connected to the output terminal of the voltage divider module 200, and receives the first output voltage V1 for buffering and isolating the first output voltage V1 to generate the second output voltage V4. It can be understood that the first output voltage V3 and the second output voltage V4 have the same voltage magnitude.
As shown in fig. 2, in the present embodiment, the voltage follower module 300 includes: an operational amplifier U1, a first capacitor C1 and a second capacitor C2. A first input terminal of the operational amplifier U1 is connected to the output terminal of the voltage divider module 200 and the first node a to receive the first output voltage V1, a second input terminal of the operational amplifier U1 is connected to the output terminal thereof, and an output terminal of the operational amplifier U1 outputs the second output voltage V4. One end of the first capacitor C1 is connected to the first power supply terminal of the operational amplifier U1, and the other end of the first capacitor C1 is grounded. One end of the second capacitor C2 is connected to the second power supply terminal of the operational amplifier U1, and the other end of the second capacitor C2 is grounded. The first power supply terminal of the operational amplifier U1 receives a first power supply voltage VCC, and the second power supply terminal of the operational amplifier U1 receives a second power supply voltage VDD.
The voltage follower module 300 buffers and isolates the voltage obtained after voltage division, so that the output voltage after voltage division is not affected by the output impedance of the later stage, and the stability of the output voltage of the direct-current power supply is improved on the premise of realizing high precision of the output voltage of the direct-current power supply.
The addition module 400 is connected to the reference dc power module 100 and the voltage follower module 300, respectively, receives the second reference voltage V2 and the second output voltage V4, and obtains a sum of the second reference voltage V2 and the second output voltage V4 to generate the target output voltage V5.
In the embodiment, the adding module 400 is an adder, and the adder has a first input terminal receiving the second reference voltage V2, a second input terminal receiving the second output voltage V4, and an output terminal outputting the target output voltage V5 with the same high precision obtained by adding the second output voltage V4 with high precision and the second reference voltage V2 with low precision. It should be understood that the above is only a simpler embodiment of the present invention, and other schemes of summing the second reference voltage V2 and the second output voltage V4 to obtain the target output voltage V5, which are easily conceivable by those skilled in the art, should also be within the scope of the present invention.
Further, the dc power supply provided by the present invention may further include a calculating unit, wherein the calculating unit is configured to calculate and obtain voltage values of the first reference voltage V1 and the second reference voltage V2 output by the reference dc power supply module 100 in the dc power supply according to the voltage division ratio of the voltage division module 200 in the dc power supply, the required target voltage input by the staff, and the offset of the dc power supply. The automatic operation of the direct-current power supply is facilitated, and the use is convenient.
Fig. 3 is a flowchart illustrating a method for improving the accuracy of the output voltage of the dc power supply according to an embodiment of the present invention.
As shown in fig. 3 and shown in fig. 1 and fig. 2, it can be known that, in the present embodiment, the method for improving the accuracy of the output voltage of the dc power supply includes the following steps:
in step S1, a first reference voltage and a second reference voltage are generated by the reference dc power supply module.
In this embodiment, the first reference voltage V1 and the second reference voltage V2 are provided by the reference dc power module 100 (e.g., DP 832A). The first reference voltage V1 and the second reference voltage V2 provided by the reference dc power module 100 are two paths of output voltages that do not affect each other, and the voltage accuracies of the first reference voltage V1 and the second reference voltage V2 are all in millivolt level.
In step S2, the voltage dividing module divides the first reference voltage to generate a first output voltage.
In this embodiment, the voltage dividing module 200 includes a plurality of resistors with the same resistance. The dividing the first reference voltage V1 by the voltage dividing module 200, generating the first output voltage V3 further includes: connecting partial resistors (such as R1-R7) of a plurality of resistors with the same resistance value in series between the input end of the first reference voltage V1 and the first node A; connecting another part of the resistors (such as R8-R14) with the same resistance value in parallel between the first node A and the ground terminal; the first output voltage V3 is output from the first node a.
Further, the voltage value of the first output voltage V3 is smaller than that of the first reference voltage V1, and the first output voltage V3 is at a different magnitude from the first reference voltage V1.
In step S3, the first output voltage is buffer isolated by the voltage follower module to generate a second output voltage.
In this embodiment, in order to prevent the divided first output voltage V3 from being affected by the output impedance of the subsequent circuit and further ensure the stability of the output voltage of the dc power supply, the voltage divider module 200 is followed by the voltage follower module 300, which performs buffer isolation on the first output voltage V3 generated by the voltage divider module 200 and generates a high-precision voltage of a temperature that is not affected by the output impedance of the subsequent circuit, i.e., the second output voltage V4. The first output voltage V3 and the second output voltage V4 have the same voltage value and the same voltage precision.
In step S4, the second reference voltage and the second output voltage are added and summed by the addition module to obtain the target output voltage.
In this embodiment, after the high-precision second output voltage V4 is obtained, the high-precision (microvolt-level) second output voltage V4 and the low-precision (millivolt-level) second reference voltage V2 are added and summed by the addition module 400, so that the high-precision target output voltage V5, which is the output voltage of the dc power supply, can be obtained. It is understood that when the voltage value of the target output voltage V5 is less than 1mV, the voltage value of the second reference voltage V2 provided by the reference dc power supply module 100 is 0V.
Alternatively, the adding module 400 is an adder.
Illustratively, the reference dc power module 100 is DP832A, and the voltage output by itself has an accuracy of 1 mV. When it is needed to provide an output voltage of 2.00008V, the specific implementation process is as follows: firstly, a path of 0.004V voltage is provided by a reference direct current power supply module 100 to be output as a first reference voltage V1, and a path of 2V voltage is provided to be output as a second reference voltage V2; then, the first reference voltage V1 of 0.004V is stepped down by one fifths through the voltage divider module 200, so as to generate a first output voltage V3 of 0.00008V; then, a voltage follower module (constructed by adopting an operational amplifier SGM 8251) with low offset voltage (5 uV at normal temperature) is used for buffer isolation, and then isolated second output voltage V4 of 0.00008V is output; finally, the addition module 400 adds and sums the second reference voltage V2 of 2V and the second output voltage V4 of 0.00008V to obtain the target output voltage V5 of 2.00008V.
Further, in a preferred embodiment of the present invention, before the adding the second reference voltage and the second output voltage by the adding module, the adding module further includes: and changing the voltage value of the first reference voltage generated by the reference direct-current power supply module, measuring and judging whether the variation of the second output voltage meets the precision requirement of the output voltage of the direct-current power supply, and adjusting the voltage division ratio of the voltage division module under the condition that the variation of the second output voltage does not meet the precision requirement of the output voltage of the direct-current power supply.
For example, after the circuit is completed, an 8-bit multimeter is used to measure whether the variation of the second output voltage V4 output by the output terminal of the voltage follower module 300 is a product of 0.001V and the voltage division ratio of the voltage division module 200 (e.g., 0.00002V) when the first reference voltage V1 provided by the reference dc power supply module 100, such as DP832A, changes from 0.001V to 0.002V, respectively. If so, indicating that the circuit structure of the direct current power supply has no problem and the output voltage precision meets the requirement; if not, it indicates that the circuit structure of the dc power supply has a defect that affects the output accuracy, and if the voltage division ratio of the voltage division module 200 has a deviation, the voltage division ratio of the voltage division module 200 needs to be adjusted. In this embodiment, the circuit structure of the dc power supply can be calibrated, and the high accuracy of the output voltage of the dc power supply is further ensured.
Further, in another preferred embodiment of the present invention, before the generating the first reference voltage and the second reference voltage by the reference dc power supply module, the method further includes: after the preset use times or time are spaced, the voltage value of the output end of the voltage follower module is measured in an idle mode, and the offset of the direct-current power supply is obtained; and obtaining the voltage value of the first reference voltage which is actually required to be generated by the reference direct-current power supply based on the offset. In this embodiment, voltage through the output to voltage follower module carries out empty survey, can obtain DC power supply's offset to subtract this offset in the in-service use process, can avoid the influence of technological error or supply voltage error etc. of components and parts to DC power supply output voltage precision, and then improve DC power supply's absolute accuracy.
In summary, in the present invention, the voltage dividing module divides one of the two reference voltages generated by the reference dc power module, i.e. the first reference voltage, to obtain the first output voltage that is smaller than the first reference voltage and has a different magnitude from the first reference voltage, and obtain the target output voltage based on the first output voltage and the other of the two reference voltages generated by the reference dc power module, so as to improve the accuracy of the output voltage of the dc power supply. Meanwhile, the voltage follower module is adopted to buffer and isolate the divided voltage, so that the divided output voltage is not influenced by the post-stage output impedance, and the stability of the output voltage of the direct-current power supply is improved on the premise of realizing high precision of the output voltage of the direct-current power supply.
The voltage division is performed by adopting a mode of combining a plurality of resistors with the same resistance in series-parallel connection, so that the high matching degree of each resistor in the voltage division module is realized, the influence on the voltage division ratio due to different errors of the resistance values of the plurality of resistors is reduced, the accuracy of the voltage division result of the first reference voltage is enhanced, and the precision of the output voltage of the direct-current power supply is further improved.
It should be noted that, in this document, the contained terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: it should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (10)
1. A direct current power supply, comprising:
the reference direct current power supply module is used for providing a first reference voltage and a second reference voltage;
the voltage division module is connected with the reference direct current power supply module and used for dividing the first reference voltage to generate a first output voltage;
the voltage follower module is connected with the output end of the voltage division module, receives the first output voltage and generates a second output voltage;
an adding module for obtaining a sum of the second reference voltage and the second output voltage to generate a target output voltage,
wherein the first output voltage is less than the first reference voltage, and the first output voltage is at a different magnitude than the first reference voltage.
2. The dc power supply of claim 1, wherein the voltage divider module comprises:
a plurality of resistors, wherein a part of the resistors are connected in series between the first reference voltage input terminal and a first node, another part of the resistors are connected in parallel between the first node and a ground terminal, and a voltage at the first node is the first output voltage.
3. The dc power supply of claim 2, wherein the plurality of resistors have the same resistance.
4. The dc power supply of claim 1, wherein the voltage follower module comprises:
the first input end of the operational amplifier receives the first output voltage, the second input end of the operational amplifier is connected with the output end, and the output end of the operational amplifier outputs the second output voltage;
the first capacitor is connected between the first power supply end and the grounding end of the operational amplifier;
and the second capacitor is connected between the second power supply end and the grounding end of the operational amplifier.
5. The dc power supply of claim 1, wherein the summing module comprises an adder, a first input of the adder receiving the second reference voltage, and a second input of the adder receiving the second output voltage.
6. A method for improving the accuracy of the output voltage of a direct current power supply is characterized by comprising the following steps:
generating a first reference voltage and a second reference voltage by a reference direct current power supply module;
dividing the first reference voltage by a voltage dividing module to generate a first output voltage;
buffering and isolating the first output voltage by a voltage follower module to generate a second output voltage;
adding and summing the second reference voltage and the second output voltage by an adding module to obtain a target output voltage,
wherein the first output voltage is less than the first reference voltage, and the first output voltage is at a different magnitude than the first reference voltage.
7. The method according to claim 6, wherein the voltage divider module comprises a plurality of resistors with the same resistance.
8. The method of claim 7, wherein dividing the first reference voltage by the voltage divider module to generate the first output voltage comprises:
connecting part of the resistors with the same resistance value in series between the first reference voltage input end and a first node;
connecting another part of the resistors with the same resistance value in parallel between the first node and a ground terminal;
outputting the first output voltage from the first node.
9. The method of any of claims 6-8, wherein prior to adding the second reference voltage and the second output voltage by the adding module, further comprising:
changing the voltage value of the first reference voltage generated by the reference direct-current power supply module, measuring and judging whether the variation of the second output voltage meets the precision requirement of the output voltage of the direct-current power supply,
and under the condition that the variation of the second output voltage does not meet the precision requirement of the output voltage of the direct-current power supply, adjusting the voltage division proportion of the voltage division module.
10. The method of any one of claims 6-8, wherein generating the first reference voltage and the second reference voltage by the reference DC power module further comprises:
after the preset use times or time are spaced, the voltage value of the output end of the voltage follower module is measured in an idle mode, and the offset of the direct-current power supply is obtained;
and obtaining the voltage value of the first reference voltage which is actually required to be generated by the reference direct-current power supply based on the offset.
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