CN111864835A - Farad capacitor constant power charging system and control method thereof - Google Patents
Farad capacitor constant power charging system and control method thereof Download PDFInfo
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- CN111864835A CN111864835A CN202010678674.2A CN202010678674A CN111864835A CN 111864835 A CN111864835 A CN 111864835A CN 202010678674 A CN202010678674 A CN 202010678674A CN 111864835 A CN111864835 A CN 111864835A
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- 238000007600 charging Methods 0.000 title claims abstract description 76
- 239000003990 capacitor Substances 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000010354 integration Effects 0.000 claims description 6
- 230000004069 differentiation Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 5
- 230000002093 peripheral effect Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000010280 constant potential charging Methods 0.000 description 1
- 238000010277 constant-current charging Methods 0.000 description 1
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- 230000002035 prolonged effect Effects 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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
-
- 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
Abstract
The invention provides a farad capacitor constant power charging system, which takes a single-chip microcomputer MCU as a core, and realizes constant power charging by collecting voltage and current data in the charging process in real time, carrying out PID operation by a microprocessor and outputting a PWM driving signal to control a half-bridge circuit. The system simplifies the peripheral circuit, and has the characteristics of reduced system power consumption, convenient charging parameter modification, accurate charging detection and control, and good use effect.
Description
Technical Field
The invention relates to the technical field of automatic control design, in particular to a farad capacitor constant-power charging system and a control method thereof.
Technical Field
The existing farad capacitor charging system generally adopts a constant voltage charging or constant current charging mode. When giving farad capacitor charging through the constant voltage mode, there is the power loss of charging big, the problem that the power curve of charging changes always leads to the calculation charging data that can not be fine, surpasss farad capacitor rated power easily when the charging voltage who sets up is too high to damage farad capacitor and cause the electric capacity to burn through, take place explosion danger.
When the farad capacitor is charged in a constant current mode, although the current is relatively stable in the charging process, the voltage is always changed and tends to rise, although the charging power seems to tend to rise, the charging time is obviously prolonged, the initial charging power is low, and when the charging power is far greater than the initial power after the voltage rises, the limit of the storage capacity of the farad capacitor can be exceeded due to improper control, so that the farad capacitor is damaged, and the loss in the charging process is very high.
Disclosure of Invention
The invention aims to provide a farad capacitor constant power charging system and a control method thereof, which not only simplify peripheral circuits, but also can accurately control charging power and have low power consumption.
The technical scheme for realizing the aim of the invention is a farad capacitor constant power charging system, which comprises a main control circuit and a display module connected with the main control circuit, and is characterized in that: farad capacitance constant power charging system comprises control circuit, drive circuit, half-bridge circuit, filter circuit, voltage acquisition circuit, current acquisition circuit and input module, control circuit loops through drive circuit, half-bridge circuit and is connected with filter circuit, master control circuit still is connected with voltage acquisition circuit, current acquisition circuit and input module respectively.
And the main control circuit is a micro control unit and is used for receiving the power parameters set by the input module, processing the data acquired by the voltage acquisition circuit and the current acquisition circuit, calculating the real-time charging power, comparing the real-time charging power with the set power parameters, calculating and sending a control signal to the drive circuit.
And the half-bridge circuit is composed of two NMOS transistors, and the two NMOS transistors are turned on in turn after receiving a driving signal sent by the driving circuit.
The filter circuit is composed of an inductor and a capacitor, and provides a current leakage channel for the NMOS transistor of the lower bridge arm of the half-bridge circuit, so that two NMOS transistors in the half-bridge circuit are ensured to be conducted in turn.
And the voltage acquisition circuit monitors farad capacitor charging voltage in a resistance voltage division mode and sends acquired voltage information to the master control circuit.
And the current acquisition circuit is used for acquiring current information of farad capacitor charging and transmitting the detected current information to the main control circuit.
And the input module is a key used for inputting a set value of the charging power of the capacitor connected with the method and transmitting the set value to the main control circuit.
The invention also provides a control method of the farad capacitor constant power charging system, which is characterized by comprising the following steps:
8.1. Inputting the target value of the charging power into a main control chip through an input module;
8.2. the current acquisition circuit and the voltage acquisition circuit respectively acquire real-time current and voltage values of the Faraday capacitor and transmit the acquired values to the main control circuit;
8.3. the main control circuit calculates real-time power according to the real-time current and voltage values, and subtracts the target value of the charging power and the real-time power to obtain a deviation value and a deviation differential of the target value and the real-time power;
8.4. substituting the deviation value and the deviation differential into a PID (proportion integration differentiation) calculation formula, calculating to obtain a duty ratio increment, and transmitting the duty ratio increment to a timer of a main control chip, wherein the main control chip outputs a pulse wave with variable duty ratio to control a half-bridge circuit to change output voltage in real time so as to charge a Faraday capacitor at constant power;
8.5. and repeating the steps 8.2 to 8.4 until the charging is finished.
And in step 8.4, the PID calculation formula is as follows:
where Kp is the proportional gain; t istIs an integration time constant; t isDIs a differential time constant; u (t) is the output signal of the PID controller; e (t) is the difference between the given value r (t) and the measured value.
The invention has the advantages that: 1. the MCU is used as a core, voltage and current data in the charging process are collected in real time, the PID operation is carried out by the microprocessor, and a PWM driving signal is output to control the half-bridge circuit to realize constant power charging. 2. The system simplifies the peripheral circuit, can effectively reduce the power consumption of the system, is convenient to modify the charging parameters, and has accurate charging detection and control and high charging efficiency.
Drawings
FIG. 1 is a schematic diagram of a farad capacitor constant power charging system;
figure 2 is a logic step diagram of a farad capacitor constant power charging system control method.
Detailed Description
Referring to FIGS. 1-2, the present invention will be further described with reference to the following examples.
The invention relates to the technical field of automatic control design, in particular to a farad capacitor constant power charging system, which comprises a main control circuit and a display module connected with the main control circuit, and is characterized in that: farad capacitance constant power charging system comprises control circuit, drive circuit, half-bridge circuit, filter circuit, voltage acquisition circuit, current acquisition circuit and input module, control circuit loops through drive circuit, half-bridge circuit and is connected with filter circuit, master control circuit still is connected with voltage acquisition circuit, current acquisition circuit and input module respectively.
When the device works, the farad capacitor to be charged is respectively connected with the voltage and current acquisition circuit.
And the main control circuit is a micro control unit and is used for receiving the power parameters set by the input module, processing the data acquired by the voltage acquisition circuit and the current acquisition circuit, calculating the real-time charging power, comparing the real-time charging power with the set power parameters, calculating and sending a control signal to the drive circuit.
The main control circuit adopts a 32-bit ultra-low power consumption singlechip, and a series singlechip STM32F407 produced by Swiss ST company.
The half-bridge circuit can be further characterized in that the half-bridge circuit is composed of two NMOS transistors, and the two NMOS transistors are turned on in turn after receiving a driving signal sent by the driving circuit.
The half-bridge circuit formed by connecting two NMOS transistors in a totem-pole manner is used as a main hardware part in a farad capacitor constant-power charging system, receives a PWM wave signal sent by an MCU control circuit, and controls the two NMOS transistors to be conducted in turn.
The filter circuit is composed of an inductor and a capacitor, and provides a current leakage channel for the NMOS transistor of the lower bridge arm of the half-bridge circuit, so that two NMOS transistors in the half-bridge circuit are ensured to be conducted in turn.
By adopting the design, the charging voltage can charge the farad capacitor by PWM with higher frequency.
The voltage acquisition circuit monitors farad capacitor charging voltage in a resistance voltage division mode and sends acquired voltage information to the main control circuit.
The voltage acquisition circuit is used for acquiring voltage in the charging process of the farad capacitor, and in order to ensure the accuracy of real-time power calculation of charging of the farad capacitor, the voltage acquisition circuit monitors the charging voltage of the farad capacitor in a resistance voltage division mode, wherein a megaohm-level resistor is selected for reducing the influence on current detection in the charging process of the farad capacitor.
And the current acquisition circuit is used for acquiring current information of farad capacitor charging and transmitting the detected current information to the main control circuit.
The current acquisition circuit selects a current detection chip INA270 with high-end current detection capability, and acquires current information representing farad capacitor charging by acquiring voltage on a 20 milliohm sampling resistor and converting the voltage through the INA 270.
The technical scheme is that the input module is a key used for inputting a set value of the charging power of the capacitor and transmitting the set value to the main control circuit.
The key input is adopted, so that the complex communication circuit design during parameter input through an upper computer (computer) is avoided, the peripheral circuit is greatly simplified, and the overall power consumption of the system is reduced.
The invention also provides a control method of the farad capacitor constant power charging system, which is characterized by comprising the following steps:
8.1. Inputting the target value of the charging power into a main control chip through an input module;
8.2. the current acquisition circuit and the voltage acquisition circuit respectively acquire real-time current and voltage values of the Faraday capacitor and transmit the acquired values to the main control circuit;
8.3. the main control circuit calculates real-time power according to the real-time current and voltage values, and subtracts the target value of the charging power and the real-time power to obtain a deviation value and a deviation differential of the target value and the real-time power;
8.4. substituting the deviation value and the deviation differential into a PID (proportion integration differentiation) calculation formula, calculating to obtain a duty ratio increment, and transmitting the duty ratio increment to a timer of a main control chip, wherein the main control chip outputs a pulse wave with variable duty ratio to control a half-bridge circuit to change output voltage in real time so as to charge a Faraday capacitor at constant power;
8.5. and repeating the steps 8.2 to 8.4 until the charging is finished.
And in step 8.4, the PID calculation formula is as follows:
where Kp is the proportional gain; t istIs an integration time constant; t isDIs a differential time constant; u (t) is the output signal of the PID controller; e (t) is the difference between the given value r (t) and the measured value.
Claims (9)
1. The utility model provides a farad capacitance constant power charging system, includes main control circuit and connects the display module on it, its characterized in that: farad capacitance constant power charging system comprises control circuit, drive circuit, half-bridge circuit, filter circuit, voltage acquisition circuit, current acquisition circuit and input module, control circuit loops through drive circuit, half-bridge circuit and is connected with filter circuit, master control circuit still is connected with voltage acquisition circuit, current acquisition circuit and input module respectively.
2. A farad capacitor constant power charging system according to claim 1, wherein: the main control circuit is a micro control unit and is used for receiving the power parameters set by the input module, processing data acquired by the voltage acquisition circuit and the current acquisition circuit, calculating real-time charging power, comparing the real-time charging power with the set power parameters, calculating and sending a control signal to the drive circuit.
3. A farad capacitor constant power charging system according to claim 1, wherein: the half-bridge circuit is composed of two NMOS transistors, and the two NMOS transistors are conducted in turn after receiving a driving signal sent by the driving circuit.
4. A farad capacitor constant power charging system according to claim 1, wherein: the filter circuit consists of an inductor and a capacitor, and provides a current leakage channel for the NMOS transistor of the lower bridge arm of the half-bridge circuit, so that two NMOS transistors in the half-bridge circuit are ensured to be conducted in turn.
5. A farad capacitor constant power charging system according to claim 1, wherein: the voltage acquisition circuit monitors farad capacitor charging voltage in a resistance voltage division mode and sends acquired voltage information to the main control circuit.
6. A farad capacitor constant power charging system according to claim 1, wherein: the current acquisition circuit is used for acquiring current information of farad capacitor charging and transmitting the detected current information to the main control circuit.
7. A farad capacitor constant power charging system according to claim 1, wherein: the input module is a key used for inputting a set value of the charging power of the capacitor connected with the method and transmitting the set value to the main control circuit.
8. A method of controlling a farad capacitor constant power charging system according to claim 1, comprising the steps of:
8.1. inputting the target value of the charging power into a main control chip through an input module;
8.2. the current acquisition circuit and the voltage acquisition circuit respectively acquire real-time current and voltage values of the Faraday capacitor and transmit the acquired values to the main control circuit;
8.3. the main control circuit calculates real-time power according to the real-time current and voltage values, and subtracts the target value of the charging power and the real-time power to obtain a deviation value and a deviation differential of the target value and the real-time power;
8.4. substituting the deviation value and the deviation differential into a PID (proportion integration differentiation) calculation formula, calculating to obtain a duty ratio increment, and transmitting the duty ratio increment to a timer of a main control chip, wherein the main control chip outputs a pulse wave with variable duty ratio to control a half-bridge circuit to change output voltage in real time so as to charge a Faraday capacitor at constant power;
8.5. And repeating the steps 8.2 to 8.4 until the charging is finished.
9. The method of claim 8, wherein the step of controlling the farad-capacitive constant power charging system comprises the steps of: in step 8.4, the PID calculation formula is as follows:
where Kp is the proportional gain; t istIs an integration time constant; t isDIs a differential time constant; u (t) is the output signal of the PID controller; e (t) is the difference between the given value r (t) and the measured value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010678674.2A CN111864835A (en) | 2020-07-15 | 2020-07-15 | Farad capacitor constant power charging system and control method thereof |
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| CN202010678674.2A CN111864835A (en) | 2020-07-15 | 2020-07-15 | Farad capacitor constant power charging system and control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114142552A (en) * | 2021-11-11 | 2022-03-04 | 歌尔科技有限公司 | Constant-power charging circuit, electronic equipment and system |
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| CN203707857U (en) * | 2013-12-27 | 2014-07-09 | 深圳市光大激光科技股份有限公司 | Solid laser power supply with constant output power |
| CN103944215A (en) * | 2014-03-17 | 2014-07-23 | 天津工业大学 | Resonance type charging control system based on current feedback and control method thereof |
| CN208241386U (en) * | 2018-05-16 | 2018-12-14 | 无锡联力电子科技股份有限公司 | A kind of constant-power charging circuit |
| CN109278570A (en) * | 2018-10-11 | 2019-01-29 | 湖北师范大学 | A kind of energy-saving electromagnetic navigation intelligent vehicle, control system and control method |
-
2020
- 2020-07-15 CN CN202010678674.2A patent/CN111864835A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3922650B1 (en) * | 2006-03-24 | 2007-05-30 | 株式会社パワーシステム | Charging device for capacitor storage power supply |
| CN203707857U (en) * | 2013-12-27 | 2014-07-09 | 深圳市光大激光科技股份有限公司 | Solid laser power supply with constant output power |
| CN103944215A (en) * | 2014-03-17 | 2014-07-23 | 天津工业大学 | Resonance type charging control system based on current feedback and control method thereof |
| CN208241386U (en) * | 2018-05-16 | 2018-12-14 | 无锡联力电子科技股份有限公司 | A kind of constant-power charging circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114142552A (en) * | 2021-11-11 | 2022-03-04 | 歌尔科技有限公司 | Constant-power charging circuit, electronic equipment and system |
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