CN114857333A - Coil current control method, device and circuit - Google Patents
Coil current control method, device and circuit Download PDFInfo
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- CN114857333A CN114857333A CN202210466532.9A CN202210466532A CN114857333A CN 114857333 A CN114857333 A CN 114857333A CN 202210466532 A CN202210466532 A CN 202210466532A CN 114857333 A CN114857333 A CN 114857333A
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- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
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- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
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Abstract
The embodiment of the application provides a current control method, a device and a circuit of a coil. The method comprises the following steps: acquiring a preset average current value, a preset current fluctuation value, coil parameters and the maximum current of the coil; the preset average current value is used for indicating that the working current of the coil is matched with the preset average current value, the preset current fluctuation value is used for indicating that the fluctuation value of the working current of the coil is smaller than or equal to the preset current fluctuation value, and the parameters of the coil comprise the resistance value and the inductance value of the coil; determining the PWM frequency of the coil according to the preset current fluctuation value, the parameters of the coil and the maximum current of the coil; determining the PWM duty ratio of the coil according to the preset average current value, the parameter of the coil, the maximum current of the coil and the PWM frequency; the coils are driven according to the PWM frequency and the PWM duty cycle. In this way, the accuracy of the control of the coil current can be improved, and the fluctuation of the coil current can be reduced.
Description
Technical Field
The present disclosure relates to the field of current control, and in particular, to a current control method, device and circuit for a coil.
Background
With the development of motorcycle technology, people no longer meet the requirement that ABS (Anti-lock Braking System) can only realize Braking, and TCS (Traction Control System), hill start, automatic parking, head raising prevention, tail raising prevention and other functions are successively added to ABS. The electromagnetic valve is controlled by an electromagnetic field formed by coil current, so that the coil current is accurately controlled, namely the flow of the electromagnetic valve is accurately controlled, the ABS is more accurately controlled, and the braking and additional function effects are more stable. Therefore, how to control the coil current more precisely becomes an increasingly important issue.
At present, when the current of a coil is controlled, the current of the coil at the next moment is adjusted according to the collected current of the coil at one moment, namely the current of the coil is adjusted in a continuous trial and error mode, so that the current of the coil is not accurately controlled. In addition, currently, when controlling the coil current, no consideration is given to how the coil current fluctuation can be reduced.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a method, an apparatus and a circuit for controlling a coil current, which can improve the accuracy of controlling the coil current and reduce the fluctuation of the coil current.
In order to achieve the above purpose, the embodiments of the present application employ the following technical solutions:
in a first aspect, the present application provides a method of current control of a coil. The current control method for a coil according to the first aspect includes: acquiring a preset average current value, a preset current fluctuation value, coil parameters and the maximum current of the coil; the coil parameter comprises a resistance value and an inductance value of the coil, the maximum current of the coil is determined according to a power supply voltage and the resistance value of the coil, and the power supply voltage is a voltage generated by a power supply circuit for supplying power to the coil; determining the PWM (Pulse Width Modulation) frequency of the coil according to the preset current fluctuation value, the parameters of the coil and the maximum current of the coil; determining the PWM duty ratio of the coil according to the preset average current value, the parameter of the coil, the maximum current of the coil and the PWM frequency; the coils are driven according to the PWM frequency and the PWM duty cycle.
In a second aspect, the present application provides a current control apparatus for a coil, including an obtaining module and a processing module; the acquisition module is used for acquiring a preset average current value, a preset current fluctuation value, coil parameters and the maximum current of the coil; the coil parameter comprises a resistance value and an inductance value of the coil, the maximum current of the coil is determined according to a power supply voltage and the resistance value of the coil, and the power supply voltage is a voltage generated by a power supply circuit for supplying power to the coil; the processing module is used for determining the PWM frequency of the coil according to the preset current fluctuation value, the parameter of the coil and the maximum current of the coil; the processing module is also used for determining the PWM duty ratio of the coil according to the preset average current value, the parameters of the coil, the maximum current of the coil and the PWM frequency; and the processing module is also used for driving the coil according to the PWM frequency and the PWM duty ratio.
In an optional embodiment of the present application, the processing module is further configured to determine a first constraint relation that a charging time and a discharging time of the coil satisfy; wherein the first constraint relationship indicates a correspondence relationship between a preset current fluctuation value, a parameter of the coil, a maximum current of the coil, a charging time, and a discharging time; the processing module is further used for determining the sum of the charging time and the discharging time according to the first constraint relation and the second constraint relation; wherein the second constraint relationship indicates that the charge time and the discharge time are equal; and the processing module is also used for determining the PWM frequency according to the sum of the charging time and the discharging time.
In an alternative embodiment of the present application, the first constraint relationship comprises the following formula:
In an optional embodiment of the present application, the processing module is further configured to determine a second constraint relation that the charging time and the discharging time of the coil satisfy; wherein the second constraint relationship indicates a correspondence between a preset average current value, a parameter of the coil, a maximum current of the coil, a charging time, and a discharging time; the processing module is further used for determining the PWM duty ratio of the coil according to the second constraint relation, the sum of the charging time and the discharging time; wherein the sum of the charging time and the discharging time is determined according to the PWM frequency.
In an alternative embodiment of the present application, the second constraint relationship comprises the following formula:
In an optional embodiment of the present application, the processing module is further configured to obtain a working current of the coil; the processing module is also used for judging whether the working current exceeds a preset range; wherein the preset range is determined according to a preset average current value and a preset current fluctuation value; the processing module is also used for determining a compensation resistance value of the coil according to the compensation parameter and the resistance value of the coil when the working current exceeds a preset range; the processing module is further used for determining a third constraint relation met by the charging time and the discharging time of the coil; the third constraint relation indicates the corresponding relation among a preset average current value, an inductance value of the coil, a compensation resistance value, the maximum current of the coil, the charging time and the discharging time; the processing module is further used for determining the compensated PWM duty ratio of the coil according to the third constraint relation and the sum of the charging time and the discharging time; wherein the sum of the charging time and the discharging time is determined according to the PWM frequency; and the processing module is also used for driving the coil according to the PWM frequency and the compensated PWM duty ratio.
In an alternative embodiment of the present application, the third constraint relationship comprises the following formula:
In an alternative embodiment of the present application, a PWM period of the coil is smaller than a charge-discharge time constant of the coil, and the PWM period is determined according to a PWM frequency.
In a third aspect, the present application provides a current control circuit for a coil, comprising: the device comprises a processor, a voltage acquisition circuit, a coil, a power supply circuit, a switch and a PWM (pulse-width modulation) drive circuit, wherein the processor is respectively connected with the voltage acquisition circuit and the PWM drive circuit; the processor is used for acquiring power supply voltage by using the voltage acquisition circuit; the power supply voltage is the voltage generated by a power supply circuit supplying power to the coil; the processor is further used for acquiring a preset average current value, a preset current fluctuation value, coil parameters and the maximum current of the coil; the preset average current value is used for indicating that the working current of the coil is matched with the preset average current value, the preset current fluctuation value is used for indicating that the fluctuation value of the working current of the coil is smaller than or equal to the preset current fluctuation value, the parameters of the coil comprise the resistance value and the inductance value of the coil, and the maximum current of the coil is determined according to the power supply voltage and the resistance value of the coil; the processor is also used for determining the PWM frequency of the coil according to the preset current fluctuation value, the parameter of the coil and the maximum current of the coil; the processor is also used for determining the PWM duty ratio of the coil according to the preset average current value, the parameters of the coil, the maximum current of the coil and the PWM frequency; and the processor is also used for driving the switch through the PWM driving circuit according to the PWM frequency and the PWM duty ratio so as to drive the coil.
In an alternative embodiment of the present application, the processor is further configured to determine a first constraint relationship that a charging time and a discharging time of the coil satisfy; wherein the first constraint relationship indicates a correspondence relationship between a preset current fluctuation value, a parameter of the coil, a maximum current of the coil, a charging time, and a discharging time; the processor is further used for determining the sum of the charging time and the discharging time according to the first constraint relation and the second constraint relation; wherein the second constraint relationship indicates that the charge time and the discharge time are equal; and the processor is also used for determining the PWM frequency according to the sum of the charging time and the discharging time.
In an alternative embodiment of the present application, the first constraint relationship comprises the following formula:
In an alternative embodiment of the present application, the processor is further configured to determine a second constraint relationship that the charging time and the discharging time of the coil satisfy; wherein the second constraint relationship indicates a correspondence between a preset average current value, a parameter of the coil, a maximum current of the coil, a charging time, and a discharging time; the processor is further used for determining the PWM duty ratio of the coil according to the second constraint relation, the sum of the charging time and the discharging time; wherein the sum of the charging time and the discharging time is determined according to the PWM frequency.
In an alternative embodiment of the present application, the second constraint relationship comprises the following formula:
In an optional embodiment of the present application, the apparatus of the third aspect further comprises a current collection circuit, and the current collection circuit is connected to the switch and the processor, respectively. The processor is also used for acquiring the working current of the coil by using the current acquisition circuit; the processor is also used for judging whether the working current exceeds a preset range; wherein the preset range is determined according to a preset average current value and a preset current fluctuation value; the processor is also used for determining a compensation resistance value of the coil according to the compensation parameter and the resistance value of the coil when the working current exceeds a preset range; the processor is further used for determining a third constraint relation met by the charging time and the discharging time of the coil; the third constraint relation indicates the corresponding relation among a preset average current value, an inductance value of the coil, a compensation resistance value, the maximum current of the coil, the charging time and the discharging time; the processor is further used for determining the compensated PWM duty ratio of the coil according to the third constraint relation and the sum of the charging time and the discharging time; wherein the sum of the charging time and the discharging time is determined according to the PWM frequency; and the processor is also used for driving the coil according to the PWM frequency and the compensated PWM duty ratio.
In an alternative embodiment of the present application, the third constraint relationship comprises the following formula:
In an alternative embodiment of the present application, a PWM period of the coil is smaller than a charge-discharge time constant of the coil, and the PWM period is determined according to a PWM frequency.
In the embodiments provided based on the above aspects, when the coil is driven in the PWM manner, the frequency of the PWM is related to the fluctuation degree of the current of the coil, and the duty ratio of the PWM is related to the average value of the current of the coil. Therefore, the PWM frequency is determined based on the preset current fluctuation value and the parameters of the coil and the maximum current of the coil, and an appropriate frequency can be selected so that the current fluctuation of the coil is less than or equal to the preset current fluctuation value. And determining the PWM duty ratio of the coil according to a preset average current value, the parameter of the coil, the maximum current of the coil and the PWM frequency determined in advance, wherein a proper PWM duty ratio can be selected to enable the current average value of the coil to be equal to or as close as possible to the preset average current value, and the current of the coil is prevented from being adjusted in a continuous trial and error mode. Thus, the embodiment provided by the application can improve the accuracy of the control of the coil current and reduce the fluctuation of the coil current.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a current control circuit of a coil according to an embodiment of the present disclosure;
fig. 2 is a schematic flowchart of a current control method for a coil according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram illustrating a charging process of a coil according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram of a discharging process of a coil according to an embodiment of the present application;
fig. 5 is a schematic diagram of a current waveform of a coil continuously charged and discharged at a fixed PWM frequency according to an embodiment of the present application;
FIG. 6 is a diagram illustrating a relationship between a current fluctuation value and a PWM duty ratio of a coil according to an embodiment of the present disclosure;
fig. 7 is a functional block diagram of a current control apparatus for a coil according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
It should be noted that the features of the embodiments of the present application may be combined with each other without conflict.
The embodiment of the application provides some technical schemes, including a current control method of a coil, a current control device of the coil and a current control circuit of the coil. The technical solution provided by the present application will be described below with reference to the accompanying drawings.
First, a current control circuit of a coil provided in an embodiment of the present application is described. Referring to fig. 1, fig. 1 is a schematic structural diagram of a current control circuit 100 of a coil according to an embodiment of the present disclosure. The current control circuit 100 of the coil includes: processor 110, voltage acquisition circuit 120, coil 130, PWM drive circuit 140, switch (Q1), freewheel circuit 160, power supply circuit 170.
The processor 110 may be a Central Processing Unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program according to the present disclosure, which is not limited herein. The voltage acquisition circuit 120 may be a circuit capable of acquiring a voltage, such as a voltage collector, and is not limited thereto. The coil 130 may be a coil in a solenoid valve, and may also be referred to as an inductor. The switch Q1 may be a transistor, for example, a MOS transistor. The freewheel circuit 160 may be a circuit capable of consuming an electric power of the coil 130. The power supply circuit 170 may be a power supply, such as a voltage source. The coupling (electrical connection) relationship between the elements in the current control circuit 100 of the coil can refer to fig. 1, and is not described in detail.
Optionally, the current control circuit 100 of the coil may further include a current acquisition circuit 150. The current collection circuit 150 may be a circuit capable of collecting current, such as a current collector, and is not limited thereto.
Optionally, the current control circuit 100 of the coil may further include a memory. The memory may be a device having a memory function. Such as, but not limited to, read-only memory (ROM) or other types of static storage devices that may store static information and instructions, Random Access Memory (RAM) or other types of dynamic storage devices that may store information and instructions, electrically erasable programmable read-only memory (EEPROM), compact disk read-only memory (CD-ROM) or other optical disk storage, optical disk storage (including compact disk, laser disk, optical disk, digital versatile disk, blu-ray disk, etc.), magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.
Referring again to fig. 1, the positive pole of the power supply circuit 170 may be connected to the coil 130, and may supply power to the coil 130. The processor 110 can drive the PWM driving circuit 140 to control the on/off of the switch Q1, and the switch Q1 is connected in series with the coil 130, when the switch Q1 is turned on, the power supply circuit 170 can charge the coil 130; when the switch Q1 is open, a loop is formed between the coil 130 and the freewheel circuit 160 so that the coil 130 can discharge. Therefore, the charging and discharging of the coil 130 can be controlled by controlling the on and off of the switch Q1. In this way, the processor 110 may drive the coil 130 in a PWM manner by controlling the PWM driving circuit 140. The processor 110 may also collect the supply voltage generated by the supply circuit 170 through the voltage collection circuit 120. When Q1 is on, processor 110 may also collect the current flowing through coil 130 via current collection circuit 150.
On the basis of the current control circuit 100 of the coil shown in fig. 1, the embodiment of the present application further provides a current control method of the coil, which can be applied to the current control circuit 100 of the coil and can be executed by the processor 110 of the coil. Referring to fig. 2, fig. 2 is a schematic flow chart of a current control method of a coil according to an embodiment of the present disclosure.
The detection method may include the following steps S110 to S130, which are described below, respectively.
S110, acquiring a preset average current value, a preset current fluctuation value, parameters of the coil 130 and the maximum current of the coil 130.
The preset average current value is used to indicate that the magnitude of the operating current of the coil 130 matches the preset average current value. The preset current fluctuation value is used to indicate that the fluctuation value of the operating current of the coil 130 is less than or equal to the preset current fluctuation value. It should be noted that, since there may be a certain error in practical applications, the "the magnitude of the operating current of the coil 130 matches the preset average current value" may be understood as that the magnitude of the operating current of the coil 130 is equal to or approximately equal to the preset average current value.
For example, the preset average current value and the preset current fluctuation value may be stored in the memory in advance. Therefore, the manner of obtaining the preset average current value and the preset current fluctuation value may be: the processor 110 reads the preset average current value and the preset current fluctuation value in the memory.
Alternatively, the preset average current value and the preset current fluctuation value may be modified. For example, the user may modify the preset average current value and the preset current fluctuation value stored in the memory through an interactive circuit (such as a touch screen, a key, etc.) connected to the processor 110. In this way, the average current and the current fluctuation of the coil 130 can be adjusted by the user according to the user's needs, and the user experience is improved.
In S110, the parameters of the coil 130 include a resistance value (hereinafter, R) and an inductance value (hereinafter, L) of the coil 130. The resistance value and the inductance value of the coil 130 may be a resistance value and an inductance value of the coil 130 at a certain temperature, for example, may be a resistance value and an inductance value of the coil 130 at a normal temperature. The resistance and inductance of the coil 130 can be preset according to the requirement, and the coil 130 meeting the preset resistance and inductance can be manufactured.
In S110, the maximum current (hereinafter, I) of the coil 130 MAX ) Is determined based on the supply voltage and the resistance value of the coil 130, and the supply voltage is a voltage generated by the supply circuit 170 supplying power to the coil 130. For example, assuming that the voltage generated by the power supply circuit 170 supplying power to the coil 130 is U, ignoring the influence of the switch Q1 and the current acquisition circuit 150 BAT Then the maximum current I of the coil 130 can be determined MAX ＝U BAT and/R. Optionally, the processor 110 may periodically collect the voltage generated by the power supply circuit 170 as U BAT Thereby periodically updating the maximum current of the coil 130.
Wherein the parameters of the coil 130 may be pre-stored in the memory. Thus, the way to obtain the parameters of the coil 130 may be: the processor 110 reads the parameters of the coil 130 in the memory. In addition, the manner of obtaining the maximum current of the coil 130 may be: processor 110 generates a signal according to the formula: i is MAX ＝U BAT the/R calculates the maximum current of the coil 130.
And S120, determining the PWM frequency of the coil 130 according to the preset current fluctuation value, the parameter of the coil 130 and the maximum current of the coil 130.
In practical applications, the PWM frequency is related to the degree of fluctuation of the current of the coil 130. In other words, a function can be determined to describe the relationship between the preset current ripple value, the parameters of the coil 130, the maximum current of the coil 130, and the PWM frequency of the coil 130. The processor 110 may use the function to determine the PWM frequency of the coil 130 according to the preset current fluctuation value, the parameter of the coil 130 and the maximum current of the coil 130.
Specifically, S120 may include the following step 1.1 to step 1.3. The following is a detailed description:
step 1.1, a first constraint relation that the charging time and the discharging time of the coil 130 satisfy is determined.
Wherein the first constraint relation is used for indicating the corresponding relation among the preset current fluctuation value, the parameter of the coil 130, the maximum current of the coil 130, the charging time and the discharging time.
For example, the first constraint relationship may include the following equation (1):
wherein Δ I is a predetermined current fluctuation value, R is a resistance value of the coil 130, L is an inductance value of the coil 130, and I MAX Maximum current, T, of coil 130 1 Charging time, T, of the coil 130 2 Is the discharge time of the coil 130. Due to delta I, R, L, I MAX It is known that one can determine an inclusion T according to equation (1) 1 、T 2 And (4) a formula.
And 1.2, determining the sum of the charging time and the discharging time according to the first constraint relation and the second constraint relation.
Wherein the second constraint relationship indicates that the charge time and the discharge time are equal. Illustratively, according to formula (1) and T 1 ＝T 2 Can determine T 1 +T 2 。
And step 1.3, determining the PWM frequency according to the sum of the charging time and the discharging time.
For example, the PWM frequency may be determined according to the following equation (2):
wherein f is the PWM frequency.
The above steps 1.1 to 1.3 are further described with reference to fig. 3 to 6:
fig. 3 is a schematic diagram of a charging process of a coil according to an embodiment of the present application, and a current direction of I1 in fig. 3 represents a charging current direction of the power supply DC to the coil 130. Fig. 4 is a schematic diagram of a discharging process of a coil according to an embodiment of the present application, and a current direction of I2 in fig. 4 represents a discharging current direction of the coil 130. Since the coil 130 satisfies the inductive charging model and the inductive discharging model, it can be determined that:
the coil 130, when charged, satisfies equation (3):
the coil 130, when discharged, satisfies equation (4):
wherein ,I0 Is the initial current of the coil 130. I is MAX Is the maximum current of the coil 130, i.e., the charging steady-state current. e is a natural constant. T is 1 The charging time of the coil 130. T is 2 Is the discharge time of the coil 130. R is the resistance value of the coil 130. L is the coil inductance value of the coil 130.
Fig. 5 is a schematic diagram of current waveforms of a coil continuously charged and discharged at a fixed PWM frequency according to an embodiment of the present application. Referring to fig. 5, the horizontal axis X represents time and the vertical axis Y represents current, and it can be seen that subsequent changes tend to repeat after the current of the coil 130 fluctuates several times.
With reference to fig. 5, the low points of the current fluctuation process of the coil 130 are respectively denoted as i min-0 、i min-1 、i min-2 、i min-3 、i min-4 、...、i min-(n) 、...、i min-(N) . Thus, on the basis of the above formulas (3) and (4), formulas (5) and (6) can be obtained:
i min-0 ＝0 (6)
according to the formula (5) and the formula (6), the formula (7) can be obtained:
with reference to fig. 5, the high points of the coil 130 during the current fluctuation process are respectively denoted as i max-0 、i max-1 、i max-2 、i max-3 、...、i max-(n) 、...、i max-(N) . Thus, on the basis of the above formulas (3) and (4), formulas (8) and (9) can be obtained:
according to the formula (8) and the formula (9), the formula (10) can be obtained:
according to the formula (7) and the formula (10), the formula (11) can be determined:
according to the formula (7) and the formula (10), the formula (12) can be further determined:
equation (12) may represent a correspondence relationship between the preset current fluctuation value, the parameter of the coil 130, the maximum current of the coil 130, the charging time, and the discharging time, that is, the first constraint relationship described above. Equation (11) may represent a correspondence relationship between a preset average current value, a parameter of the coil 130, a maximum current of the coil 130, a charging time, and a discharging time, that is, a second constraint relationship to be described later.
Further, let the PWM frequency be f and the PWM duty cycle be D, then
Fig. 6 is a schematic diagram illustrating a relationship between a current fluctuation value and a PWM duty ratio of a coil according to an embodiment of the present application. Referring to FIG. 6, the horizontal axis X represents Δ I/I MAX It can be seen that when f is fixed and D is 50%, the current fluctuation value of the coil 130 is the largest.
Therefore, in the above-mentioned step 1.1 to step 1.3, Δ I, R, L, I is caused MAX It is known that one can determine an inclusion T according to equation (1) 1 、T 2 Equation (corresponding step 1.1). In order to make the current fluctuation of the coil 130 always smaller than the preset current fluctuation value, the PWM frequency satisfying the requirement can be calculated when D is 50%, that is, according to the formula (1) and T 1 ＝T 2 Can determine T 1 +T 2 (corresponding step 1.2). And due to
Thus, the PWM frequency is determined from the sum of the charging time and the discharging time (corresponding to step 1.3).
In some possible embodiments, the PWM period of the coil 130 is less than the charge-discharge time constant of the coil 130, and the PWM period is determined according to the PWM frequency. The charging and discharging time constant (denoted as τ) of the coil 130 may be determined according to the resistance value and the inductance value of the coil, for example, τ is L/R. Specifically, if the PWM period is denoted as P, the PWM frequency f becomes 1/P. Therefore, the PWM period of the coil 130 being smaller than the charge-discharge time constant of the coil 130 corresponds to: the PWM frequency of the coil 130 is greater than the inverse of the charge-discharge time constant of the coil 130. Illustratively, the PWM period of the coil 130 is less than 5 τ, and correspondingly the PWM frequency of the coil 130 is greater than 1/5. It will be appreciated that by defining an upper limit for the PWM frequency, the effect of temperature on the resistance value of the coil 130 may be reduced.
And S130, determining the PWM duty ratio of the coil 130 according to the preset average current value, the parameter of the coil 130, the maximum current of the coil 130 and the PWM frequency.
In practical applications, the PWM duty cycle is related to the average current value of the coil. In other words, a function can be determined that describes the relationship between the preset average current value, the parameters of the coil 130, the maximum current of the coil 130, the PWM frequency, and the PWM duty cycle of the coil 130. The processor 110 may use the function to determine the "PWM duty cycle of the coil 130 based on the preset average current value, the parameters of the coil 130, the maximum current of the coil 130, and the PWM frequency".
Specifically, S130 may include the following step 2.1 to step 2.2. The following is a detailed description:
step 2.1, a second constraint relation that the charging time and the discharging time of the coil 130 satisfy is determined.
Wherein the second constraint relationship is used for indicating the corresponding relationship among the preset average current value, the parameter of the coil 130, the maximum current of the coil 130, the charging time and the discharging time.
Exemplary, the second constraint relationship includes the following equation (13):
wherein ,IAVR A predetermined average current value, R is a resistance value of the coil 130, L is an inductance value of the coil 130, I MAX Is the maximum current, T, of the coil 130 1 For charging time, T 2 Is the discharge time.Due to I AVR 、R、L、I MAX It is known that one can determine an inclusion T according to equation (13) 1 、T 2 And (4) a formula.
The derivation process of the second constraint relationship refers to the related descriptions of fig. 3 to fig. 6, and is not described herein again.
And 2.2, determining the PWM duty ratio of the coil 130 according to the second constraint relation, the sum of the charging time and the discharging time. Wherein the sum of the charging time and the discharging time is determined according to the PWM frequency.
Illustratively, the PWM frequency f and the formula determined according to S120 described above
The sum T of the charging time and the discharging time can be determined 1 +T 2 . Thus, T can be based on the second constraint relationship 1 +T 2 And
the PWM duty cycle may be determined.
In S130, since the maximum current of the coil 130 is determined according to the supply voltage of the coil 130, the influence of the supply voltage on the current can be added to the control of the current through S130.
S140, the coil 130 is driven according to the PWM frequency and the PWM duty.
The manner in which the coils 130 are driven according to the PWM frequency and the PWM duty cycle is described above with reference to fig. 1, and will not be described herein again.
In some possible embodiments, to further improve the accuracy of the control of the coil current. S140, may further include the following step 3.1 to step 3.6:
and 3.1, acquiring the working current of the coil 130.
For example, the processor 110 may collect the operating current (hereinafter Ic) flowing through the coil 130 through the current collecting circuit 150. It is understood that the operating current is the average current of the coil 130.
And 3.2, judging whether the working current exceeds a preset range.
The preset range is determined according to a preset average current value and a preset current fluctuation value. For example, the preset range may include (I) AVR -ΔI/2，I AVR +ΔI/2)。
And 3.3, when the working current exceeds the preset range, determining the compensation resistance value of the coil 130 according to the compensation parameter and the resistance value of the coil 130. And when the working current does not exceed the preset range, returning to execute the step 3.1.
Since the effect of temperature on the resistance value of the coil 130 is linear, an example can be based on the formula: r' K · R determines the compensation resistance value of the coil 130. Where R is the resistance value (uncompensated) of the coil 130. K is a compensation parameter, which may be predetermined. R' is the compensation resistance value of the coil 130.
And 3.4, determining a third constraint relation met by the charging time and the discharging time of the coil 130.
Wherein the third constraint relationship indicates a corresponding relationship between a preset average current value, an inductance value of the coil 130, a compensation resistance value, a maximum current of the coil 130, a charging time, and a discharging time.
Exemplary, the third constraint relationship includes the following equation (14):
wherein ,IAVR For a predetermined average current value, R is the resistance of the coil 130, K is a compensation parameter, L is the inductance of the coil 130, I MAX Maximum current, T, of coil 130 1 For charging time, T 2 Is the discharge time.
And 3.5, determining the compensated PWM duty ratio of the coil 130 according to the third constraint relation, the sum of the charging time and the discharging time. Wherein the sum of the charging time and the discharging time is determined according to the PWM frequency.
Illustratively, the sum of the charge time and the discharge time is determined according to the following formula:
the compensated PWM duty cycle is determined according to the following formula:
wherein, D' is the compensated PWM duty ratio.
The execution principle of step 3.4 and step 3.5 is similar to that of step 2.1 and step 2.2, and the related description can refer to the above, which is not described herein again.
Step 3.6, drive the coil 130 according to the PWM frequency and the compensated PWM duty cycle.
The manner of driving the coil 130 according to the PWM frequency and the compensated PWM duty cycle is described with reference to the above description of fig. 1, and will not be described herein again.
In the above step 3.1 to step 3.6, since the temperature of the coil 130 may affect the resistance value of the coil 130 during the operation process of the coil 130, the resistance value of the coil 130 is changed, and the operation current of the coil 130 deviates from the preset average current value. In order to reduce the influence of temperature on the resistance value of the coil 130, the resistance value of the coil 130 may be compensated, the compensated PWM duty ratio of the coil 130 may be determined according to the compensated compensation resistance value, and the coil 130 may be driven according to the PWM frequency and the compensated PWM duty ratio, so that the operating current of the coil 130 is further close to or equal to the preset average current value, thereby further improving the accuracy of the control of the coil current. In addition, only the current may be collected in the above step 3.1 to step 3.6, that is, the average current of the coil 130 may be temperature compensated, and it is not necessary to separately collect the temperature.
In the above S110 to S140, when the coil of the solenoid valve is driven by PWM, the frequency of PWM is related to the fluctuation degree of the current of the coil, and the duty ratio of PWM is related to the average value of the current of the coil. Therefore, the PWM frequency is determined based on the preset current fluctuation value and the parameters of the coil and the maximum current of the coil, and an appropriate frequency can be selected so that the current fluctuation of the coil is less than or equal to the preset current fluctuation value. And determining the PWM duty ratio of the coil according to a preset average current value, the parameter of the coil, the maximum current of the coil and the PWM frequency determined in advance, wherein a proper PWM duty ratio can be selected to enable the current average value of the coil to be equal to or as close as possible to the preset average current value, and the current of the coil is prevented from being adjusted in a continuous trial and error mode. Thus, the embodiment provided by the application can improve the accuracy of the control of the coil current and reduce the fluctuation of the coil current.
In order to execute the corresponding steps in the above embodiments and various possible manners, an implementation manner of a current control device of a coil is given below, please refer to fig. 7, and fig. 7 shows a functional block diagram of a current control device of a coil provided by an embodiment of the present application. The current control device of the coil can be used for realizing the current control circuit of the coil shown in fig. 7 and can be used for executing the steps which can be executed by the current control circuit of the coil in the method embodiment. It should be noted that the basic principle and the technical effects of the current control apparatus 300 for a coil provided in the present embodiment are the same as those of the above embodiments, and for the sake of brief description, no part of the present embodiment is mentioned, and reference may be made to the corresponding contents in the above embodiments. The current control apparatus 300 of the coil may include: an acquisition module 310 and a processing module 320.
Alternatively, the above modules may be stored in a memory in the form of software or Firmware (Firmware) or be fixed in an Operating System (OS) of a processor of the current control circuit of the coil shown in fig. 1 provided in the present application, and may be executed by the processor in the current control circuit of the coil shown in fig. 1. Meanwhile, data, codes of programs, and the like required to execute the above modules may be stored in the memory.
The obtaining module 310 is configured to obtain a preset average current value, a preset current fluctuation value, a parameter of the coil, and a maximum current of the coil; the coil parameter comprises a resistance value and an inductance value of the coil, the maximum current of the coil is determined according to a power supply voltage and the resistance value of the coil, and the power supply voltage is a voltage generated by a power supply circuit for supplying power to the coil; the processing module 320 is configured to determine a PWM frequency of the coil according to a preset current fluctuation value, a parameter of the coil, and a maximum current of the coil; the processing module 320 is further configured to determine a PWM duty cycle of the coil according to the preset average current value, the parameter of the coil, the maximum current of the coil, and the PWM frequency; the processing module 320 is further configured to drive the coil according to the PWM frequency and the PWM duty cycle.
It is understood that the obtaining module 310 and the processing module 320 may be used to support the current control circuit of the coil shown in fig. 1 to perform the steps related to the above method embodiments and/or other processes for the techniques described herein, without limitation.
Based on the above method embodiment, the present application also provides a computer readable storage medium, on which a computer program is stored, and the computer program is executed by a processor to perform the steps of the current control method for the coil.
In particular, the storage medium may be a general-purpose storage medium, such as a removable magnetic disk, a hard disk, or the like, and the computer program on the storage medium, when executed, is capable of executing the current control method of the coil.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.
In addition, units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
Furthermore, the functional modules in the embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A method of controlling current in a coil, comprising:
acquiring a preset average current value, a preset current fluctuation value, coil parameters and the maximum current of the coil;
the preset average current value is used for indicating that the working current of the coil is matched with the preset average current value, the preset current fluctuation value is used for indicating that the fluctuation value of the working current of the coil is smaller than or equal to the preset current fluctuation value, the parameters of the coil comprise the resistance value and the inductance value of the coil, the maximum current of the coil is determined according to the power supply voltage and the resistance value of the coil, and the power supply voltage is the voltage generated by a power supply circuit for supplying power to the coil;
determining the Pulse Width Modulation (PWM) frequency of the coil according to the preset current fluctuation value, the parameter of the coil and the maximum current of the coil;
determining the PWM duty ratio of the coil according to the preset average current value, the parameter of the coil, the maximum current of the coil and the PWM frequency;
driving the coil according to the PWM frequency and the PWM duty cycle.
2. The method of claim 1, wherein determining the PWM frequency of the coil according to the preset current fluctuation value, the parameter of the coil and the maximum current of the coil comprises:
determining a first constraint relation that is satisfied by the charging time and the discharging time of the coil; wherein the first constraint relationship indicates a correspondence relationship between the preset current fluctuation value, the parameter of the coil, the maximum current of the coil, the charging time, and the discharging time;
determining the sum of the charging time and the discharging time according to the first constraint relation and the second constraint relation; wherein the second constraint relationship indicates that the charge time and the discharge time are equal;
and determining the PWM frequency according to the sum of the charging time and the discharging time.
3. The method of claim 2, wherein the first constraint relationship comprises the following formula:
wherein Δ I is the preset current fluctuation value, R is the resistance value of the coil, L is the inductance value of the coil, I MAX Is the maximum current of the coil, T 1 For said charging time, T 2 Is the discharge time;
the PWM frequency is determined according to the following formula:
wherein f is the PWM frequency.
4. The method of claim 1, wherein determining the PWM duty cycle of the coil based on the preset average current value, the parameter of the coil, and the maximum current of the coil comprises:
determining a second constraint relation that the charging time and the discharging time of the coil meet; wherein the second constraint relationship indicates a correspondence relationship between the preset average current value, the parameter of the coil, the maximum current of the coil, the charging time, and the discharging time;
determining the PWM duty ratio of the coil according to the second constraint relation, the sum of the charging time and the discharging time; wherein a sum of the charging time and the discharging time is determined according to the PWM frequency.
5. The method of claim 4, wherein the second constraint relationship comprises the following formula:
wherein ,IAVR R is the resistance value of the coil, L is the inductance value of the coil, I MAX Is the maximum current of the coil, T 1 For said charging time, T 2 Is the discharge time;
the sum of the charging time and the discharging time is determined according to the following formula:
wherein f is the PWM frequency;
the PWM duty cycle is determined according to the following formula:
wherein D is the PWM duty cycle.
6. The method of claim 1, wherein the driving the coil according to the PWM frequency and the PWM duty cycle further comprises:
acquiring the working current of the coil;
judging whether the working current exceeds a preset range or not; the preset range is determined according to the preset average current value and the preset current fluctuation value;
when the working current exceeds the preset range, determining a compensation resistance value of the coil according to a compensation parameter and the resistance value of the coil;
determining a third constraint relation that the charging time and the discharging time of the coil meet; wherein the third constraint relationship indicates a correspondence relationship between the preset average current value, the inductance value of the coil, the compensation resistance value, the maximum current of the coil, the charging time, and the discharging time;
determining the compensated PWM duty ratio of the coil according to the third constraint relation, the sum of the charging time and the discharging time; wherein a sum of the charging time and the discharging time is determined according to the PWM frequency;
and driving the coil according to the PWM frequency and the compensated PWM duty ratio.
7. The method of claim 6, wherein the third constraint relationship comprises the following formula:
wherein ,IAVR R is the resistance value of the coil, K is the compensation parameter, L is the inductance value of the coil, I MAX Is the maximum current of the coil, T 1 For said charging time, T 2 Is the discharge time;
the sum of the charging time and the discharging time is determined according to the following formula:
wherein f is the PWM frequency;
the compensated PWM duty cycle is determined according to the following formula:
wherein D' is the compensated PWM duty cycle.
8. The method according to any one of claims 1-7, wherein a PWM period of the coil is less than a charge-discharge time constant of the coil, the PWM period being determined according to the PWM frequency.
9. The current control device of the coil is characterized by comprising an acquisition module and a processing module; wherein,
the acquisition module is used for acquiring a preset average current value, a preset current fluctuation value, coil parameters and the maximum current of the coil;
the preset average current value is used for indicating that the working current of the coil is matched with the preset average current value, the preset current fluctuation value is used for indicating that the fluctuation value of the working current of the coil is smaller than or equal to the preset current fluctuation value, the parameters of the coil comprise the resistance value and the inductance value of the coil, the maximum current of the coil is determined according to the power supply voltage and the resistance value of the coil, and the power supply voltage is the voltage generated by a power supply circuit for supplying power to the coil;
the processing module is used for determining the PWM frequency of the coil according to the preset current fluctuation value, the parameters of the coil and the maximum current of the coil;
the processing module is further configured to determine a PWM duty cycle of the coil according to the preset average current value, the parameter of the coil, the maximum current of the coil, and the PWM frequency;
the processing module is further configured to drive the coil according to the PWM frequency and the PWM duty cycle.
10. A current control circuit of a coil is characterized by comprising a processor, a voltage acquisition circuit, the coil, a power supply circuit, a switch and a Pulse Width Modulation (PWM) drive circuit, wherein the processor is respectively connected with the voltage acquisition circuit and the PWM drive circuit, the PWM drive circuit is connected with the switch, the switch is respectively connected with the coil, the power supply circuit is respectively connected with the voltage acquisition circuit and the coil, and the coil is connected with a follow current circuit; wherein,
the processor is used for acquiring power supply voltage by using the voltage acquisition circuit; the power supply voltage is a voltage generated by the power supply circuit supplying power to the coil;
the processor is further used for acquiring a preset average current value, a preset current fluctuation value, parameters of the coil and the maximum current of the coil;
the preset average current value is used for indicating that the working current of the coil is matched with the preset average current value, the preset current fluctuation value is used for indicating that the fluctuation value of the working current of the coil is smaller than or equal to the preset current fluctuation value, the parameters of the coil comprise the resistance value and the inductance value of the coil, and the maximum current of the coil is determined according to the power supply voltage and the resistance value of the coil;
the processor is further configured to determine a PWM frequency of the coil according to the preset current fluctuation value, the parameter of the coil, and the maximum current of the coil;
the processor is further configured to determine a PWM duty cycle of the coil according to the preset average current value, the parameter of the coil, the maximum current of the coil, and the PWM frequency;
the processor is further configured to drive the switch to drive the coil according to the PWM frequency and the PWM duty cycle and through the PWM drive circuit.
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