CN115622387A

CN115622387A - Control method of formation and capacity-sharing power supply, formation and capacity-sharing power supply and equipment

Info

Publication number: CN115622387A
Application number: CN202211347307.XA
Authority: CN
Inventors: 请求不公布姓名
Original assignee: Guangdong Shunshi Measurement and Control Equipment Co Ltd
Current assignee: Guangdong Shunshi Measurement and Control Equipment Co Ltd
Priority date: 2022-10-31
Filing date: 2022-10-31
Publication date: 2023-01-17

Abstract

The application discloses a control method of a formation and grading power supply, the formation and grading power supply and formation and grading equipment, wherein the power supply comprises a PID control circuit and a DC-DC circuit, and the PID control circuit comprises an outer ring and an inner ring; the method comprises the following steps: acquiring an outer loop output parameter and an inner loop inductive current of the DC-DC circuit; obtaining an outer ring current PID value according to the outer ring output parameter and a preset reference value; the method controls the working state of the power supply according to the PID value of the outer ring current and the inner ring inductive current so as to keep the output parameters of the outer ring stable.

Description

Control method of formation and capacity-sharing power supply, formation and capacity-sharing power supply and equipment

Technical Field

The present application relates to the field of chemical composition and capacitance technology, and in particular, to a control method for a chemical composition and capacitance power supply, and an apparatus.

Background

In the prior art, a lithium battery needs to be activated after being assembled, the first charging is called formation and is used for activating an active material in the battery body, the capacity grading refers to charging and discharging the battery, and the discharge capacity when the capacity grading is full is detected to determine the capacity of the battery and screen out qualified batteries. At present, a hardware analog circuit is generally relied on to control a power supply for formation and grading capacity, and the hardware analog circuit is adopted for control, so that the cost of hardware circuit devices is higher, the economic benefit is low, and the expansibility is low; at present, a digital circuit can also be adopted for control, but only a current single-loop control method is adopted, so that the control precision is low, the real-time performance is poor, and the problems of current overshoot, oscillation and the like are easily caused.

Disclosure of Invention

The present application aims to solve at least one of the technical problems in the prior art, and provides a control method for a chemical composition capacitance power supply, and a device, which can effectively improve the stability and precision of output parameters of the chemical composition capacitance power supply while ensuring low cost.

In a first aspect, an embodiment of the present application provides a control method for a chemical-mechanical capacitor power supply, where the power supply includes a PID control circuit and a DC-DC (direct current to direct current) converter, and the PID control circuit includes an outer loop and an inner loop; the method comprises the following steps: acquiring an outer loop output parameter and an inner loop inductive current of the DC-DC circuit; obtaining an outer ring current PID value according to the outer ring output parameter and a preset reference value; and controlling the working state of the power supply according to the PID value of the outer ring current and the inner ring inductive current so as to keep the output parameters of the outer ring stable.

According to the control method of the chemical composition capacitive power supply provided by the embodiment of the first aspect of the application, at least the following beneficial effects are achieved: the PID control circuit of the power supply comprises an outer ring and an inner ring, the outer ring output parameter of a DC-DC circuit of the power supply is obtained, the current PID value of the outer ring is obtained according to the output parameter and a preset reference value, the inner ring inductive current of the DC-DC circuit is obtained, and the working state of the power supply is controlled according to the outer ring current PID value and the inner ring inductive current, so that the outer ring output parameter is kept stable.

In one embodiment of the present application, the power supply further comprises a PWM modulator; the controlling the working state of the power supply according to the PID value of the outer loop current and the inner loop inductive current comprises the following steps: determining a target duty ratio of the PWM modulator according to the PID value of the outer loop current and the inner loop inductive current; and controlling the duty ratio of the PWM modulator to be the target duty ratio.

In an embodiment of the present application, the outer ring is a voltage outer ring, the outer ring output parameter is an output voltage, and the preset reference value is a preset voltage value; the obtaining of the PID value of the outer loop current according to the outer loop output parameter and a preset reference value comprises the following steps: taking the difference value between the preset voltage value and the output voltage as the input of the voltage outer ring; and outputting the PID value of the outer loop current according to the PID algorithm of the voltage outer loop.

In an embodiment of the present application, the outer ring is a current outer ring, the outer ring output parameter is an output current, and the preset reference value is a preset current value; the obtaining of the PID value of the outer loop current according to the outer loop output parameter and the preset reference value comprises: taking the difference value between the preset current value and the output current as the input of the current outer ring; and outputting the PID value of the outer loop current according to the PID algorithm of the current outer loop.

In one embodiment of the present application, the determining the target duty cycle of the PWM modulator according to the outer loop current PID value and the inner loop inductor current comprises: taking the difference value of the PID value of the outer loop current and the inner loop inductive current as the input of the inner loop; and outputting the target duty ratio of the PWM modulator according to the PID algorithm of the inner ring.

In one embodiment of the application, the output voltage of the DC-DC circuit is taken by a shunt.

In one embodiment of the application, the output current of the DC-DC circuit is obtained by a sampling resistor.

In one embodiment of the present application, the output current of the DC-DC circuit is obtained by a current transformer.

In a second aspect, an embodiment of the present application provides a component-capacitive power supply, where the component-capacitive power supply is capable of executing the control method of the component-capacitive power supply provided in the embodiment of the first aspect of the present application.

According to the electronic device provided by the second aspect of the present application, at least the following advantages are provided: the formation partial capacitance power supply is provided with a PID control circuit, the PID control circuit comprises an outer ring and an inner ring, an outer ring output parameter of a DC-DC circuit of the power supply is obtained, a current PID value of the outer ring is obtained according to the output parameter and a preset reference value, an inner ring inductive current of the DC-DC circuit is obtained, and the working state of the power supply is controlled according to the outer ring current PID value and the inner ring inductive current, so that the outer ring output parameter is kept stable.

In a third aspect, embodiments of the present application provide a chemical component capacitance apparatus including a chemical component capacitance power supply as provided in embodiments of the second aspect of the present application.

According to the third aspect of the present application, a component-capacitance apparatus is provided, which has at least the following advantages: the formation and grading equipment comprises a formation and grading power supply, wherein the power supply is provided with a PID control circuit, the PID control circuit comprises an outer ring and an inner ring, the outer ring output parameter of a DC-DC circuit of the power supply is obtained, the current PID value of the outer ring is obtained according to the output parameter and a preset reference value, the inner ring inductive current of the DC-DC circuit is obtained, and the working state of the power supply is controlled according to the outer ring current PID value and the inner ring inductive current, so that the outer ring output parameter is kept stable.

Drawings

Fig. 1 is a flowchart illustrating steps of a method for controlling a variable-capacitance power supply according to an embodiment of the present disclosure;

fig. 2 is a flowchart illustrating detailed steps of a control method for a variable-capacitance power supply according to an embodiment of the present application;

FIG. 3 is a flowchart illustrating detailed steps of a control method for a variable-capacity power supply according to an embodiment of the present disclosure;

fig. 4 is a flowchart of another detailed step of a control method for a variable-capacitance power supply according to an embodiment of the present application;

FIG. 5 is a flowchart illustrating detailed steps of a control method for a variable-capacitance power supply according to an embodiment of the present application;

fig. 6 is a system block diagram of a control method of a chemical capacitive power supply according to an embodiment of the present disclosure;

fig. 7 is another system block diagram of a control method of a variable-capacitance power supply according to an embodiment of the present application.

Detailed Description

Reference will now be made in detail to the present embodiments of the present application, preferred embodiments of which are illustrated in the accompanying drawings, wherein the description is provided for the purpose of visually supplementing the description and enabling the understanding of each and every feature and every aspect of the present application, and not for the purpose of limiting the scope of the present application.

In the description of the present application, the meaning of a plurality is one or more, the meaning of a plurality is two or more, and larger, smaller, larger, etc. are understood as excluding the present number, and larger, smaller, inner, etc. are understood as including the present number. If any, first, second and third are described for the purpose of distinguishing technical features, but not for the purpose of indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present application, unless otherwise specifically limited, terms such as set, installed, connected and the like should be understood broadly, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present application in combination with the specific contents of the technical solutions.

The embodiment of the application provides a control method of a component-capacitance power supply, the component-capacitance power supply and equipment, which can effectively improve the stability and the precision of output parameters of the component-capacitance power supply while ensuring low cost.

The embodiments of the present application will be further explained with reference to the drawings.

Referring to fig. 1, fig. 1 is a flowchart illustrating steps of a method for controlling a chemical-capacitive power supply according to an embodiment of the present disclosure, and as shown in fig. 1, the embodiment of the present disclosure provides a method for controlling a chemical-capacitive power supply, where the chemical-capacitive power supply is used for chemical capacitive coupling of a lithium battery cell, the power supply includes a PID control circuit and a DC-DC circuit, where the PID control circuit includes an outer loop and an inner loop, and the method includes step S100, step S200, and step S300.

S100, acquiring an outer ring output parameter and an inner ring inductive current of the DC-DC circuit;

step S200, obtaining an outer loop current PID value according to the outer loop output parameter and a preset reference value;

and step S300, controlling the working state of the power supply according to the outer ring current PID value and the inner ring inductive current so as to keep the outer ring output parameters stable.

In an exemplary embodiment, the chemical component capacitance power supply comprises a PID control circuit and a DC-DC circuit, wherein the PID control circuit comprises an outer loop and an inner loop, and the cost of a hardware circuit is low because the PID control circuit is a digital circuit. In the method, an outer ring output parameter of the DC-DC circuit can be obtained, the outer ring output parameter is the output quantity of the formation capacity power supply in the working state, an outer ring current PID value is obtained according to the outer ring output parameter and a preset reference value, and an inner ring inductive current of the DC-DC circuit can also be obtained, so that the working state of the power supply is controlled according to the outer ring current PID value and the inner ring inductive current, the outer ring output parameter is kept stable, the low hardware circuit cost is ensured, meanwhile, the stability and the precision of the formation capacity power supply output parameter can be effectively improved through the double closed-loop PID control of the outer ring and the inner ring, the problems of current overshoot, oscillation and the like are avoided to a certain extent, the formation effect of the lithium battery cell is ensured, and the method has strong applicability and can be suitable for power supplies of various specifications.

It will be appreciated by those skilled in the art that the preset reference value may be input to the PID control circuit by a user via communication. In this embodiment, the output parameter of the outer loop of the DC-DC circuit of the power supply can be kept stable under PID control, and is maintained at a preset reference value, so as to meet the charging requirement of the lithium battery.

It is also understood that PID is: abbreviations for proportionality, integral, differential. The PID control algorithm is a control algorithm which combines three links of proportion, integral and differential into a whole, is the control algorithm with the most mature technology and the most wide application in a continuous system, and is suitable for the situation where the controlled object model is not clearly known. When PID is used to control many industrial processes, satisfactory effect can be obtained. The essence of the PID control is that the operation is performed according to the function relationship of proportion, integral and differential according to the input deviation value, and the operation result is used to control the output. In this embodiment, through outer loop PID control and inner loop PID control, can effectively avoid electric current to vibrate and overshoot, the power can provide comparatively stable output for lithium battery electricity core, guarantees the effect that the formation becomes.

In an exemplary embodiment, as shown in fig. 2, fig. 2 is a flowchart illustrating a detailed step of a control method for a variable-capacity power supply provided in an embodiment of the present application, and step S300 in fig. 1 may include step S310 and step S320.

Step S310, determining a target duty ratio of the PWM modulator according to the outer loop current PID value and the inner loop inductance current;

and step S320, controlling the duty ratio of the PWM modulator to be the target duty ratio.

As can be understood by those skilled in the art, the PWM modulator can control on and off of the switching device inside the DC-DC circuit, and can adjust the output parameter of the DC-DC circuit by adjusting the duty ratio of the PWM modulator.

As shown in fig. 3, fig. 3 is a flowchart of a detailed step of step S200 in fig. 1, and an embodiment of the present application provides a control method for a chemical-capacitive power supply, where an outer loop of a PID control circuit is a voltage outer loop, an output parameter of the outer loop is an output voltage, a preset reference value is a preset voltage value, and step S200 may include step S210 and step S220.

Step S210, taking the difference value between the preset voltage value and the output voltage as the input of a voltage outer ring;

and step S220, outputting an outer loop current PID value according to the PID algorithm of the voltage outer loop.

In an exemplary embodiment, the outer ring of the PID control circuit is a voltage outer ring, the outer ring output parameter is an output voltage, the preset reference value is a preset voltage value, the output voltage of the outer ring can be obtained, that is, the output voltage of the DC-DC circuit is obtained, a difference value between the preset voltage value and the output voltage is used as an input of the outer ring, and an outer ring current PID value is obtained according to an algorithm of the outer ring PID, so that the duty ratio of the PWM modulator is adjusted according to the outer ring current PID value in the following process, and the output voltage is kept constant.

In this embodiment, the output voltage of the DC-DC circuit of the power supply can be kept constant under PID control, thereby effectively avoiding oscillation and overshoot, and achieving a better formation effect.

As shown in fig. 4, fig. 4 is another flowchart of a detailed step of step S200 in fig. 1, and an embodiment of the present application provides another control method for a chemical-capacitive power source, where an outer loop of a PID control circuit is a current outer loop, an output parameter of the outer loop is an output current, a preset reference value is a preset current value, and step S200 may include step T210 and step T220.

Step T210, taking the difference value of the preset current value and the output current as the input of the current outer ring;

and T220, outputting an outer loop current PID value according to the PID algorithm of the current outer loop.

In an exemplary embodiment, the outer ring of the PID control circuit is a current outer ring, the outer ring output parameter is an output current, the preset reference value is a preset current value, the output current of the outer ring can be obtained, that is, the output current of the DC-DC circuit is obtained, a difference value between the preset current value and the output current is used as an input of the outer ring, and according to an algorithm of the outer ring PID, an outer ring current PID value is obtained, so that a duty ratio of the PWM modulator is adjusted according to the outer ring current PID value in the following process, the stability of the output current is protected, oscillation and overshoot are effectively avoided, and a formation effect on the lithium battery cell is better.

As shown in fig. 5, fig. 5 is a flowchart of a detailed step of step S310 in fig. 2, and the embodiment of the present application provides a control method of a chemical capacitive power source, where step S310 may include step S311 and step S312.

Step S311, taking the difference value between the PID value of the outer loop current and the inner loop inductive current as the input of the inner loop;

and step S312, outputting the target duty ratio of the PWM modulator according to the PID algorithm of the inner ring.

In an exemplary implementation, an outer loop current PID value can be obtained through a PID outer loop, an inner loop inductive current of a DC-DC circuit can also be obtained, for a PID inner loop, a difference value between the outer loop current PID value and the inner loop inductive current is used as an input of the PID inner loop, a target duty ratio of the PWM modulator can be obtained and output according to a PID algorithm of the inner loop, and the PWM modulator is controlled to operate at the target duty ratio, so that an output parameter of the DC-DC circuit can be kept stable, oscillation and overshoot of the output parameter are effectively avoided, and stable output of a power supply with high precision and without overshoot can be realized.

In some embodiments of the present application, the output voltage of the DC-DC circuit may be obtained by a current divider.

It should be noted that, the present application does not specifically limit the manner of obtaining the output voltage of the DC-DC circuit, and the embodiment is within the protection scope as long as the output voltage of the DC-DC circuit can be obtained for the subsequent PID adjustment control.

In some embodiments of the present application, the output current of the DC-DC circuit may be obtained by a sampling resistor.

It should be noted that the present application does not specifically limit the manner of obtaining the output current of the DC-DC circuit, and the present application is within the scope of protection of the present application as long as the output current of the DC-DC circuit can be obtained for the subsequent PID adjustment control.

In some embodiments of the present application, the output current of the DC-DC circuit may also be obtained through a current transformer, and the present application is also within the scope of the embodiments of the present application.

In some embodiments of the present application, the inner loop inductance current of the DC-DC circuit may be obtained through a sampling resistor, but the present embodiment does not specifically limit the manner of obtaining the inner loop inductance current of the DC-DC circuit, and the inner loop inductance current of the DC-DC circuit is only obtained for inner loop PID control, and is within the protection scope of the embodiments of the present application.

Referring to fig. 6, fig. 6 is a system block diagram of a control method of a component-capacitance power supply according to an embodiment of the present disclosure, where the component-capacitance power supply includes a DC-DC circuit, a PWM modulator, and a PID control circuit, where the PID control circuit includes a current outer loop and a current inner loop, and obtains an output current of the DC-DC circuit through a sampling resistor, and obtains an inner loop inductance current of the DC-DC circuit, and may also receive a preset current value input from the outside, and use a difference between the preset current value and the output current as an input of an outer loop PID, and obtain and output an outer loop current PID value according to a current outer loop PID algorithm, and use a difference between the outer loop current PID value and the inner loop inductance current as an input of the inner loop, and obtain and output a target duty ratio of the PWM modulator according to the inner loop PID algorithm, and control the PWM modulator to operate at the target duty ratio, and under regulation control of the current outer loop and the current inner loop, current oscillation and overshoot can be effectively avoided, thereby ensuring that the output current of the DC-DC circuit can be kept constant, and being beneficial to perform formation of a lithium battery cell.

Referring to fig. 7, fig. 7 is a system block diagram of another control method of a chemical composition capacity power supply provided in this embodiment, where the chemical composition capacity power supply includes a DC-DC circuit, a PWM modulator, and a PID control circuit, where the PID control circuit includes a voltage outer loop and a current inner loop, an output voltage of the DC-DC circuit may be obtained through a shunt, an inner loop inductance current of the DC-DC circuit may be obtained through a sampling resistor, a preset voltage value input from the outside may also be received, the preset voltage value and the output voltage are used as inputs of the voltage outer loop to obtain and output an outer loop current PID value, a difference value between the outer loop current PID value and the inner loop inductance current is used as an input of the current inner loop to obtain and output a target duty ratio of the PWM modulator, the PWM modulator is controlled to operate at the target duty ratio, and under regulation control of the voltage outer loop and the current inner loop, current oscillation and overshoot may be effectively avoided, so as to ensure that the output voltage of the DC-DC circuit may be kept constant, which is beneficial for performing a control method of a lithium battery cell of a lithium battery.

Embodiments of the present application further provide a component-capacitive power supply, where the power supply is capable of executing the control method of the component-capacitive power supply provided in the embodiment of the first aspect of the present application. The formation and capacity-sharing power supply comprises a PID control circuit and a DC-DC circuit, wherein the PID control circuit comprises an outer ring and an inner ring, and the cost of a hardware circuit is low because the PID control circuit is a digital circuit. In the method, an outer ring output parameter of the DC-DC circuit can be obtained, the outer ring output parameter is the output quantity of the formation capacity power supply in the working state, an outer ring current PID value is obtained according to the outer ring output parameter and a preset reference value, and an inner ring inductive current of the DC-DC circuit can also be obtained, so that the working state of the power supply is controlled according to the outer ring current PID value and the inner ring inductive current, the outer ring output parameter is kept stable, the low hardware circuit cost is ensured, meanwhile, the stability and the precision of the formation capacity power supply output parameter can be effectively improved through the double closed-loop PID control of the outer ring and the inner ring, the problems of current overshoot, oscillation and the like are avoided to a certain extent, the formation effect of the lithium battery cell is ensured, and the method has strong applicability and can be suitable for power supplies of various specifications.

The embodiment of the application further provides chemical-component capacity equipment which comprises the chemical-component capacity power supply provided by the embodiment. The formation and capacity-sharing power supply comprises a PID control circuit and a DC-DC circuit, wherein the PID control circuit comprises an outer ring and an inner ring, and the cost of a hardware circuit is low because the PID control circuit is a digital circuit. In the method, an outer ring output parameter of the DC-DC circuit can be obtained, the outer ring output parameter is the output quantity of the formation capacity power supply in the working state, an outer ring current PID value is obtained according to the outer ring output parameter and a preset reference value, and an inner ring inductive current of the DC-DC circuit can also be obtained, so that the working state of the power supply is controlled according to the outer ring current PID value and the inner ring inductive current, the outer ring output parameter is kept stable, the low hardware circuit cost is ensured, meanwhile, the stability and the precision of the formation capacity power supply output parameter can be effectively improved through the double closed loop PID control of the outer ring and the inner ring, the problems of current overshoot, oscillation and the like are avoided to a certain extent, the formation effect of the lithium battery core is ensured, and the method has strong applicability and can be suitable for power supplies of various specifications.

Claims

1. A control method for a chemical-capacitive power supply, the power supply comprising a PID control circuit and a DC-DC circuit, characterized in that the PID control circuit comprises an outer loop and an inner loop; the method comprises the following steps:

acquiring an outer loop output parameter and an inner loop inductive current of the DC-DC circuit;

obtaining an outer ring current PID value according to the outer ring output parameter and a preset reference value;

and controlling the working state of the power supply according to the PID value of the outer ring current and the inner ring inductive current so as to keep the output parameters of the outer ring stable.

2. The control method of a variable-capacity power supply according to claim 1, wherein the power supply further comprises a PWM modulator; the controlling the working state of the power supply according to the PID value of the outer loop current and the inner loop inductive current comprises the following steps:

determining a target duty ratio of the PWM modulator according to the PID value of the outer loop current and the inner loop inductive current;

and controlling the duty ratio of the PWM modulator to be the target duty ratio.

3. The method according to claim 1, wherein the outer loop is a voltage outer loop, the outer loop output parameter is an output voltage, and the predetermined reference value is a predetermined voltage value; the obtaining of the PID value of the outer loop current according to the outer loop output parameter and a preset reference value comprises the following steps:

taking the difference value between the preset voltage value and the output voltage as the input of the voltage outer ring;

and outputting the PID value of the outer loop current according to the PID algorithm of the voltage outer loop.

4. The method according to claim 1, wherein the outer loop is a current outer loop, the outer loop output parameter is an output current, and the preset reference value is a preset current value; the obtaining of the PID value of the outer loop current according to the outer loop output parameter and the preset reference value comprises:

taking the difference value between the preset current value and the output current as the input of the current outer ring;

and outputting the PID value of the outer loop current according to the PID algorithm of the current outer loop.

5. The method for controlling a variable-capacitance power supply according to claim 2, wherein the determining the target duty ratio of the PWM modulator according to the PID value of the outer loop current and the inner loop inductor current comprises:

taking the difference value between the PID value of the outer loop current and the inductance current of the inner loop as the input of the inner loop;

and outputting the target duty ratio of the PWM modulator according to the PID algorithm of the inner ring.

6. The method according to claim 3, wherein the output voltage of the DC-DC circuit is obtained by a shunt.

7. The control method of the variable-capacity power supply according to claim 4, wherein the output current of the DC-DC circuit is obtained by a sampling resistor.

8. The control method of the capacitive power supply according to claim 4, wherein the output current of the DC-DC circuit is obtained through a current transformer.

9. A chemical component capacitance power supply, characterized in that it is capable of performing the control method of a chemical component capacitance power supply according to any one of claims 1 to 8.

10. A chemical capacitive device, characterized in that it comprises a chemical capacitive power supply according to claim 9.