CN106208310B - More capacitance grading control systems and its method - Google Patents
More capacitance grading control systems and its method Download PDFInfo
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- CN106208310B CN106208310B CN201610601727.4A CN201610601727A CN106208310B CN 106208310 B CN106208310 B CN 106208310B CN 201610601727 A CN201610601727 A CN 201610601727A CN 106208310 B CN106208310 B CN 106208310B
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000003990 capacitor Substances 0.000 claims abstract description 259
- 238000001514 detection method Methods 0.000 claims abstract description 53
- 238000012544 monitoring process Methods 0.000 claims abstract description 52
- 238000007599 discharging Methods 0.000 claims description 13
- 230000004913 activation Effects 0.000 claims description 2
- 230000002035 prolonged effect Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering using capacitors as storage or buffering devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention discloses a kind of more capacitance grading control systems and its method, system to include：Control module, capacitance module, voltage monitoring module and current detection module, the capacitance module include the capacitance of N number of parallel connection, N ＞ 1；The control module is connect with the capacitance module, voltage monitoring module and current detection module respectively, and the current detection module is connect with capacitance module.By the way that multiple capacitances are arranged and enable capacitance in batches by control module control, when the efficiency for charge-discharge of capacitance is less than preset threshold value, it then closes capacitance present and enables next group capacitance, the service life of integral capacitor can be extended, to extend the service life of integral product.
Description
Technical Field
The invention relates to the technical field of power failure protection, in particular to a multi-capacitor grading control system and a method thereof.
Background
With the popularization of networks and the explosive growth of information volume, users pay more and more attention to the storage of data, and therefore, it is desirable to correctly write data into a storage device for each data written into the storage device. Therefore, the power down protection backup capacitor plays one of the important roles here as well.
In chinese patent publication No. CN101841232A, a method for processing redundancy backup of a capacitor and a control circuit thereof are provided, in which the method for processing redundancy backup of a capacitor includes: detecting the fluctuation condition of a power supply in the circuit; and automatically adding a spare filter capacitor into the circuit according to the fluctuation condition of the power supply. A redundant backup control circuit for a capacitor, comprising: the detection module is used for detecting the fluctuation condition of a power supply in the circuit; and the redundancy backup control module is used for automatically adding a spare filter capacitor into the circuit according to the fluctuation condition of the power supply.
Because most capacitors on the circuit boards are charged and discharged simultaneously, the charging efficiency of the capacitors is reduced along with the increase of the service time, and therefore, if the service life of the capacitors is terminated earlier than the service life of the product, whether the last data is correctly written into the storage device when power failure occurs suddenly cannot be guaranteed.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: a multi-capacitor grading control system and a method thereof are provided, which can prolong the service life of the whole product by prolonging the service life of the whole capacitor.
In order to solve the technical problems, the invention adopts the technical scheme that: a multi-capacitance hierarchical control system comprising: the device comprises a control module, a capacitor module, a voltage monitoring module and a current detection module, wherein the capacitor module comprises N capacitors connected in parallel, and N is more than 1; the control module is respectively connected with the capacitor module, the voltage monitoring module and the current detection module, and the current detection module is connected with the capacitor module;
the voltage monitoring module is used for acquiring a power supply voltage value of an output load in the circuit;
the current detection module is used for acquiring the n1The current of each capacitor, the n is obtained according to the current1The charge and discharge efficiency corresponding to each capacitor;
the current detection module is further used for obtaining the n2The current of each capacitor, the n is obtained according to the current2The charge and discharge efficiency corresponding to each capacitor;
the control module is used for controlling and starting N in the N capacitors if the voltage value of the power supply is lower than a preset voltage lower limit value1The capacitors are charged and discharged; wherein n is more than or equal to 11＜N；
The control module is further used for controlling the capacitor to be closed if the charging and discharging efficiency is lower than a preset threshold value;
the control module is also used for controlling the residual N-N1Controlling start n in individual capacitors2The capacitors are charged and discharged; wherein n is more than or equal to 12≤N-n1；
The control module is further configured to determine whether all of the N capacitors are started;
if not, starting N in the capacitor which is not started in the N capacitorsiA capacitor up toWherein,
if yes, the control module controls and starts the N capacitors.
The invention also relates to a multi-capacitor grading control method, which comprises the following steps:
the voltage monitoring module acquires a power supply voltage value of an output load in the circuit;
if the power supply voltage value is lower than a preset voltage lower limit value, the control module controls to start N capacitors1The capacitors are charged and discharged; wherein N is more than 1 and N is more than or equal to 11＜N；
The current detection module obtains the n1The current of each capacitor, the n is obtained according to the current1The charge and discharge efficiency corresponding to each capacitor;
if the charging and discharging efficiency is lower than a preset threshold value, the control module controls the capacitor to be closed;
in the remaining N-N1Controlling start n in individual capacitors2The capacitors are charged and discharged; wherein n is more than or equal to 12≤N-n1；
The current detection module obtains the n2Current of a capacitor according to the electricityFlowing to obtain the n2The charge and discharge efficiency corresponding to each capacitor;
if the charging and discharging efficiency is lower than a preset threshold value, the control module controls the capacitor to be closed;
judging whether the N capacitors are all started;
if not, starting N in the capacitor which is not started in the N capacitorsiA capacitor up toWherein,
if yes, the control module controls and starts the N capacitors.
The invention has the beneficial effects that: by monitoring the power supply voltage of the output load, when the power supply voltage of the load is lower than a preset voltage lower limit value, the voltage stored in the standby capacitor immediately provides support; by arranging the plurality of capacitors and controlling the control module to start the capacitors in batches, when the charge-discharge efficiency of the capacitors is lower than a preset threshold value, the current capacitor is closed and the next batch of capacitors are started, so that the service life of the whole capacitor can be prolonged, and the service life of the whole product is prolonged.
Drawings
FIG. 1 is a schematic diagram of a multi-capacitor hierarchical control system according to the present invention;
FIG. 2 is a schematic structural diagram of a system according to a first embodiment of the present invention;
FIG. 3 is a circuit diagram according to a first embodiment of the present invention;
FIG. 4 is a flow chart of a multi-capacitor hierarchical control method according to the present invention;
FIG. 5 is a flowchart illustrating a second embodiment of the present invention.
Description of reference numerals:
1. a control module; 2. a capacitive module; 3. a voltage monitoring module; 4. a current detection module;
21. a capacitor; 22. a diode;
31. precision resistance; 32. a comparator;
41. an analog-to-digital converter; 42. a current register.
Detailed Description
In order to explain technical contents, objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
The most key concept of the invention is as follows: a plurality of capacitors are provided and enabled in batches.
Referring to fig. 1, a multi-capacitor hierarchical control system includes: the device comprises a control module, a capacitor module, a voltage monitoring module and a current detection module, wherein the capacitor module comprises N capacitors connected in parallel, and N is more than 1; the control module is respectively connected with the capacitor module, the voltage monitoring module and the current detection module, and the current detection module is connected with the capacitor module;
the voltage monitoring module is used for acquiring a power supply voltage value of an output load in the circuit;
the current detection module is used for acquiring the n1The current of each capacitor, the n is obtained according to the current1The charge and discharge efficiency corresponding to each capacitor;
the current detection module is further used for obtaining the n2The current of each capacitor, the n is obtained according to the current2The charge and discharge efficiency corresponding to each capacitor;
the control module is used for judging whether the power supply voltage value is lower than a preset valueSetting the lower limit value of the voltage, controlling the starting of N in N capacitors1The capacitors are charged and discharged; wherein n is more than or equal to 11＜N；
The control module is further used for controlling the capacitor to be closed if the charging and discharging efficiency is lower than a preset threshold value;
the control module is also used for controlling the residual N-N1Controlling start n in individual capacitors2The capacitors are charged and discharged; wherein n is more than or equal to 12≤N-n1；
The control module is further configured to determine whether all of the N capacitors are started;
if not, starting N in the capacitor which is not started in the N capacitorsiA capacitor up toWherein,
if yes, the control module controls and starts the N capacitors.
From the above description, the beneficial effects of the present invention are: the service life of the whole capacitor can be prolonged, and therefore the service life of the whole product is prolonged.
Further, the capacitance module is connected with the voltage monitoring module; the capacitor module further comprises N diodes, anodes of the N capacitors connected in parallel are respectively connected with the control module, and cathodes of the N capacitors are respectively grounded; the anodes of the N diodes are respectively connected with the anodes of the N capacitors connected in parallel in a one-to-one correspondence mode, and the cathodes of the N diodes are respectively connected with the voltage monitoring module.
Further, the voltage monitoring module is connected with the control module through the current detection module; the voltage monitoring module comprises a precision resistor and a comparator which are connected with each other, the precision resistor is connected with the capacitor module in series, and the comparator is connected with the current detection module;
and the comparator is used for acquiring the voltage of the precision resistor and judging whether the voltage is lower than a preset voltage lower limit value or not.
Furthermore, the current detection module comprises an analog-to-digital converter and a current register which are connected with each other, the analog-to-digital converter is connected with the voltage monitoring module, and the current register is connected with the control module;
the analog-to-digital converter is used for receiving the analog voltage quantity sent by the voltage monitoring module, converting the analog voltage quantity into a digital voltage quantity and sending the digital voltage quantity to the current register;
and the current register is used for prestoring the resistance value of the precision resistor and calculating to obtain a current value according to the digital voltage quantity.
As can be seen from the above description, the current of the precision resistor is equal to the current of the capacitor module by connecting the precision resistor in series with the capacitor module, so that the current of the precision resistor can be measured and calculated to obtain the current of the capacitor module; meanwhile, the precision resistor is used, so that the error can be reduced, and the precision is improved.
Referring to fig. 4, the present invention further provides a multi-capacitor hierarchical control method, including:
the voltage monitoring module acquires a power supply voltage value of an output load in the circuit;
if the power supply voltage value is lower than a preset voltage lower limit value, the control module controls to start N capacitors1The capacitors are charged and discharged; wherein N is more than 1 and N is more than or equal to 11＜N；
The current detection module obtains the n1The current of each capacitor, the n is obtained according to the current1The charge and discharge efficiency corresponding to each capacitor;
if the charging and discharging efficiency is lower than a preset threshold value, the control module controls the capacitor to be closed;
in the remaining N-N1Controlling start n in individual capacitors2The capacitors are charged and discharged; wherein n is more than or equal to 12≤N-n1；
The current detection module obtains the n2The current of each capacitor, the n is obtained according to the current2The charge and discharge efficiency corresponding to each capacitor;
if the charging and discharging efficiency is lower than a preset threshold value, the control module controls the capacitor to be closed;
judging whether the N capacitors are all started;
if not, starting N in the capacitor which is not started in the N capacitorsiA capacitor up toWherein,
if yes, the control module controls and starts the N capacitors.
Further, the control module controls to start N in the N capacitors1The specific steps of charging and discharging the capacitor are as follows:
the control module controls the conduction N in the N diodes1A diode, start n1A capacitor.
According to the above description, the plurality of capacitors are arranged and the control module controls the capacitors to be started in batches, and when the charge-discharge efficiency of the capacitors is lower than the preset threshold value, the current capacitors are closed and the next capacitors are started, so that the service life of the whole capacitor can be prolonged, and the service life of the whole product can be prolonged.
Further, the "acquiring, by the voltage monitoring module, a power supply voltage value of an output load in the circuit" specifically includes:
and a comparator in the voltage monitoring module acquires the voltage of the precision resistor connected with the N capacitors in series and judges whether the voltage is lower than a preset voltage lower limit value or not.
Further, the "current detection module obtains the n1The current of each capacitor "is specifically:
an analog-to-digital converter in the current detection module receives an analog voltage quantity sent by a voltage monitoring module, converts the analog voltage quantity into a digital voltage quantity, and sends the digital voltage quantity to a current register;
and a current register in the current detection module prestores the resistance value of the precision resistor, and the current value is calculated according to the digital voltage quantity.
Example one
Referring to fig. 2, a first embodiment of the present invention is: a multi-capacitance hierarchical control system comprising: the device comprises a control module 1, a capacitor module 2, a voltage monitoring module 3 and a current detection module 4, wherein the capacitor module 2 comprises N capacitors 21 connected in parallel, N is more than 1, and FIG. 2 takes four capacitors 21 as an example; the control module 1 is respectively connected with the capacitor module 2, the voltage monitoring module 3 and the current detection module 4, and the current detection module 4 is connected with the capacitor module 2;
the voltage monitoring module 3 is used for acquiring a power supply voltage value of an output load in the circuit;
the current detection module 4 is used for obtaining the n1The current of each capacitor 21, from which n is obtained1The charge-discharge efficiency corresponding to each capacitor 21;
the current detection module 4 is further configured to obtain the n2The current of each capacitor 21, from which n is obtained2The charge-discharge efficiency corresponding to each capacitor 21;
the control module 1 is used for judging whether the power supply voltage value is lower than a preset valueVoltage lower limit, control start-up N in N capacitors 211The capacitors 21 are charged and discharged; wherein n is more than or equal to 11＜N；
The control module 1 is further configured to control to close the capacitor 21 if the charge-discharge efficiency is lower than a preset threshold;
the control module 1 is also used for controlling the remaining N-N1Control of start n in individual capacitors 212The capacitors 21 are charged and discharged; wherein n is more than or equal to 12≤N-n1；
The control module 1 is further configured to determine whether all of the N capacitors 21 are started;
if not, N is started in the capacitor 21 which is not started in the N capacitors 21iA capacitor 21 up toWherein,
if yes, the control module 1 controls to start the N capacitors 21.
The capacitor module 2 is connected with the voltage monitoring module 3; the capacitor module 2 further comprises N diodes 22, anodes of the N capacitors 21 connected in parallel are respectively connected with the control module 1, and cathodes of the N capacitors are respectively grounded; the anodes of the N diodes 22 are respectively connected with the anodes of the N capacitors 21 connected in parallel in one-to-one correspondence, and the cathodes are respectively connected with the voltage monitoring module 3.
The voltage monitoring module 3 is connected with the control module 1 through the current detection module 4; at this time, the current detection module 4 may be connected to the capacitance module 2 through the voltage monitoring module 3; the voltage monitoring module 3 comprises a precision resistor 31 and a comparator 32 which are connected with each other, and further, two input ends of the comparator 32 are respectively connected with two ends of the precision resistor 31; the current detection module 4 comprises an analog-to-digital converter 41 and a current register 42 which are connected with each other; the precision resistor 31 is connected with the capacitor module 2 in series; the comparator 32 is connected to the current detection module 4, and further connected to an analog-to-digital converter 41 of the current detection module 4; the current register 42 is connected with the control module 1;
the comparator 32 is configured to obtain a voltage of the precision resistor 31, and determine whether the voltage is lower than a preset voltage lower limit;
the analog-to-digital converter 41 is configured to receive an analog voltage quantity sent by the voltage monitoring module 3, convert the analog voltage quantity into a digital voltage quantity, and send the digital voltage quantity to the current register 42;
the current register 42 is configured to pre-store the resistance value of the precision resistor 31, and calculate a current value according to the digital voltage.
Fig. 3 is a circuit schematic diagram of the present embodiment, wherein the Boost is a Boost circuit.
Because the precision resistor is connected with the capacitor module in series, and the current of the capacitor module is equal to that of the precision resistor, the voltage of the precision resistor is measured and divided by the resistance value of the precision resistor to obtain the current of the precision resistor, and therefore the current of the capacitor module is obtained. Meanwhile, the precision resistor is used, so that the errors of measurement and calculation can be reduced, and the precision and the accuracy are improved.
Preferably, the current register of the current detection module is connected to the control module through an I2C bus, and the control module determines the charge-discharge efficiency through current information provided by an I2C bus. Using a current power monitoring IC with an I2C interface, the monitoring IC can achieve 1% error accuracy with a maximum offset of 100 uV. The voltage difference is very small by combining the resolution of the analog-to-digital converter 12bit, and the voltage drop of a precision resistor can be reduced, so that the power loss can be reduced.
In the embodiment, by monitoring the power supply voltage of the output load, when the power supply voltage of the load is lower than a preset voltage lower limit value, the voltage stored in the backup capacitor immediately provides support; by arranging the plurality of capacitors and controlling the control module to start the capacitors in batches, when the charge-discharge efficiency of the capacitors is lower than a preset threshold value, the current capacitor is closed and the next batch of capacitors are started, so that the service life of the whole capacitor can be prolonged, and the service life of the whole product is prolonged.
Example two
Referring to fig. 5, the present embodiment is a multi-capacitance grading control method corresponding to the above embodiments, including the following steps:
s1: the voltage monitoring module acquires a power supply voltage value of an output load in the circuit.
S2: and judging whether the power supply voltage value is lower than a preset voltage lower limit value, if so, executing the step S3, and if not, continuing monitoring. And a comparator in the voltage monitoring module acquires the voltage of the precision resistor connected with the N capacitors in series and judges whether the voltage is lower than a preset voltage lower limit value or not.
S3: the control module controls the start of N in N capacitors1The capacitors are charged and discharged; wherein N is more than 1 and N is more than or equal to 11＜N。
S4: the current detection module obtains the n1The current of each capacitor, the n is obtained according to the current1And the charge and discharge efficiency corresponding to each capacitor. An analog-to-digital converter in the current detection module receives an analog voltage quantity sent by a voltage monitoring module, converts the analog voltage quantity into a digital voltage quantity, and sends the digital voltage quantity to a current register; and a current register in the current detection module prestores the resistance value of the precision resistor, and the current value is calculated according to the digital voltage quantity.
S5: and judging whether the charge-discharge efficiency is lower than a preset threshold value, if so, executing the step S6, and if not, continuing monitoring.
S6: the control module controls to turn off the capacitor, namely to turn off the n1A capacitor.
S7: controlling the activation N in the remaining capacitors, i.e. in the capacitor not activated of the N capacitorsiThe capacitors are charged and discharged; wherein the initial value of i is 2,for example, if control starts n2N is 1 or less than2≤N-n1(ii) a If control starts n3N is 1 or less than3≤N-(n1+n2) (ii) a And so on.
S8: the current detection module obtains the niThe current of each capacitor, the n is obtained according to the currentiAnd the charge and discharge efficiency corresponding to each capacitor.
S9: and judging whether the charge-discharge efficiency is lower than a preset threshold value, if so, executing the step S10, and if not, continuing monitoring.
S10: the control module controls the capacitor to be closed; i.e. turning off said niA capacitor.
S11: judging whether the N capacitors are all started, namely judgingIf not, step S12 is executed, and if so, step S13 is executed.
S12: let i equal i + 1; the execution returns to step S7.
S13: the control module controls and starts N capacitors, namely all capacitors are started simultaneously, and the final charge and discharge capacity of the capacitors is used for prolonging the service life of the product.
Preferably, the control module controls the conduction N in the N diodes1A diode, start n1A capacitor, further, controlling on niA diode, start niA capacitor.
Optionally, the preset threshold is a current value, and the current value can be directly compared with the current of the capacitor, and the charge-discharge efficiency does not need to be calculated.
For example, if the capacitor module has four capacitors, namely a first capacitor C1, a second capacitor C2, a third capacitor C3 and a fourth capacitor C4, when the power voltage value of the output load is lower than the preset voltage lower limit value, the control module generates an instruction 0001 to control to turn on the first capacitor C1 and turn off the second capacitor C2, the third capacitor C3 and the fourth capacitor C4;
when the charging and discharging efficiency of the first capacitor C1 is lower than a preset threshold, the control module generates an instruction 0010, which indicates to control to turn on the second capacitor C2 and turn off the first capacitor C1, the third capacitor C3 and the fourth capacitor C4;
when the charging and discharging efficiency of the second capacitor C2 is lower than the preset threshold, the control module generates a command 0100, which indicates to control to turn on the third capacitor C3 and turn off the first capacitor C1, the second capacitor C2 and the fourth capacitor C4;
when the charge-discharge efficiency of the third capacitor C3 is lower than a preset threshold, the control module generates an instruction 1000 indicating that the fourth capacitor C4 is controlled to be turned on, and the first capacitor C1, the second capacitor C2 and the third capacitor C3 are turned off;
when the charge-discharge efficiency of the fourth capacitor C4 is lower than the preset threshold, the control module generates an instruction 1111 to indicate that all the capacitors, i.e., the first capacitor C1, are controlled and the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 are turned off.
In summary, the multi-capacitor hierarchical control system and the method thereof provided by the present invention monitor the power voltage of the output load, and when the power voltage of the load is lower than the preset lower voltage limit, the voltage stored in the backup capacitor immediately provides support; by arranging the plurality of capacitors and controlling the control module to start the capacitors in batches, when the charge-discharge efficiency of the capacitors is lower than a preset threshold value, the current capacitor is closed and the next batch of capacitors are started, so that the service life of the whole capacitor can be prolonged, and the service life of the whole product is prolonged.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.
Claims (8)
1. A multi-capacitance hierarchical control system, comprising: the device comprises a control module, a capacitor module, a voltage monitoring module and a current detection module, wherein the capacitor module comprises N capacitors connected in parallel, and N is more than 1; the control module is respectively connected with the capacitor module, the voltage monitoring module and the current detection module, and the current detection module is connected with the capacitor module;
the voltage monitoring module is used for acquiring a power supply voltage value of an output load in the circuit;
the current detection module is used for acquiring n1The current of each capacitor, the n is obtained according to the current1The charge and discharge efficiency corresponding to each capacitor;
the current detection module is also used for obtaining n2The current of each capacitor, the n is obtained according to the current2The charge and discharge efficiency corresponding to each capacitor;
the control module is used for controlling and starting N in the N capacitors if the voltage value of the power supply is lower than a preset voltage lower limit value1The capacitors are charged and discharged; wherein n is more than or equal to 11＜N；
The control module is further used for controlling the capacitor to be closed if the charging and discharging efficiency is lower than a preset threshold value;
the control module is also used for controlling the residual N-N1Controlling start n in individual capacitors2The capacitors are charged and discharged; wherein n is more than or equal to 12≤N-n1；
The control module is further configured to determine whether all of the N capacitors are started;
if not, starting N in the capacitor which is not started in the N capacitorsiA capacitor up toWherein,
if yes, the control module controls and starts the N capacitors.
2. The multi-capacitance hierarchical control system according to claim 1, wherein the capacitance module is connected to the voltage monitoring module; the capacitor module further comprises N diodes, anodes of the N capacitors connected in parallel are respectively connected with the control module, and cathodes of the N capacitors are respectively grounded; the anodes of the N diodes are respectively connected with the anodes of the N capacitors connected in parallel in a one-to-one correspondence mode, and the cathodes of the N diodes are respectively connected with the voltage monitoring module.
3. The multi-capacitance hierarchical control system according to claim 1, wherein the voltage monitoring module is connected with the control module through the current detection module; the voltage monitoring module comprises a precision resistor and a comparator which are connected with each other, the precision resistor is connected with the capacitor module in series, and the comparator is connected with the current detection module;
and the comparator is used for acquiring the voltage of the precision resistor and judging whether the voltage is lower than a preset voltage lower limit value or not.
4. The multi-capacitance hierarchical control system according to claim 3, wherein the current detection module comprises an analog-to-digital converter and a current register connected with each other, the analog-to-digital converter is connected with the voltage monitoring module, and the current register is connected with the control module;
the analog-to-digital converter is used for receiving the analog voltage quantity sent by the voltage monitoring module, converting the analog voltage quantity into a digital voltage quantity and sending the digital voltage quantity to the current register;
and the current register is used for prestoring the resistance value of the precision resistor and calculating to obtain a current value according to the digital voltage quantity.
5. A multi-capacitance grading control method is characterized by comprising the following steps:
the voltage monitoring module acquires a power supply voltage value of an output load in the circuit;
if the power supply voltage value is lower than a preset voltage lower limit value, the control module controls to start N capacitors1The capacitors are charged and discharged; wherein N is more than 1 and N is more than or equal to 11＜N；
The current detection module obtains the n1The current of each capacitor, the n is obtained according to the current1The charge and discharge efficiency corresponding to each capacitor;
if the charging and discharging efficiency is lower than a preset threshold value, the control module controls the capacitor to be closed;
in the remaining N-N1Control of start-up in individual capacitorsn2The capacitors are charged and discharged; wherein n is more than or equal to 12≤N-n1；
The current detection module obtains the n2The current of each capacitor, the n is obtained according to the current2The charge and discharge efficiency corresponding to each capacitor;
if the charging and discharging efficiency is lower than a preset threshold value, the control module controls the capacitor to be closed;
judging whether the N capacitors are all started;
if not, starting N in the capacitor which is not started in the N capacitorsiA capacitor up toWherein,
if yes, the control module controls and starts the N capacitors.
6. The multi-capacitor stage control method according to claim 5, wherein said control module controls activation N in N capacitors1The specific steps of charging and discharging the capacitor are as follows:
the control module controls the conduction N in the N diodes1A diode, start n1A capacitor.
7. The multi-capacitor stage control method according to claim 5, wherein the step of obtaining the power supply voltage value of the output load in the circuit by the voltage monitoring module is specifically:
and a comparator in the voltage monitoring module acquires the voltage of the precision resistor connected with the N capacitors in series and judges whether the voltage is lower than a preset voltage lower limit value or not.
8. The multi-capacitor stage control method according to claim 7, wherein said current detection module obtains saidn1The current of each capacitor "is specifically:
an analog-to-digital converter in the current detection module receives an analog voltage quantity sent by a voltage monitoring module, converts the analog voltage quantity into a digital voltage quantity, and sends the digital voltage quantity to a current register;
and a current register in the current detection module prestores the resistance value of the precision resistor, and the current value is calculated according to the digital voltage quantity.
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