CN112360789A - Fan rotating speed adjusting device and method and heat exchange equipment - Google Patents
Fan rotating speed adjusting device and method and heat exchange equipment Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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Abstract
The invention discloses a fan rotating speed adjusting device and method and heat exchange equipment. Wherein, the device includes: the temperature controller is used for generating a rotating speed adjusting signal according to the rotating speed requirement; the input end of the current detection circuit is connected between the inverter and the fan and used for detecting the current input current of the fan; and the input end of the digital signal processor DSP is respectively connected with the output end of the temperature controller and the output end of the current detection circuit and is used for adjusting the rotating speed of the fan according to the rotating speed adjusting signal and the current input current. The invention can finely adjust the rotating speed of the fan, realize stepless speed regulation, simplify the debugging process and improve the debugging efficiency.
Description
Technical Field
The invention relates to the technical field of electronic power, in particular to a fan rotating speed adjusting device and method and heat exchange equipment.
Background
The market share of the terminal direct current air plate of the existing air conditioning system is very high, the conventional fan rotating speed adjusting mode is fixed wind gear speed regulation, the general debugging process is more tedious for product development and design, for customers, due to the difference of using places and environments, the purchased fan coil product cannot necessarily be optimally matched, and in order to ensure that constant air volume is output to the environment, the fan rotating speed needs to be repeatedly debugged so as to match the required air volume. Therefore, the device and the method for stepless regulating the wind speed without being limited by using conditions bring great convenience and experience for developers and users.
Aiming at the problem that the debugging process is complicated due to the fact that the rotating speed of the fan is adjusted by fixing the wind shield in the prior art, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides a fan rotating speed adjusting device and method and heat exchange equipment, and aims to solve the problem that in the prior art, the debugging process is complicated due to the fact that the rotating speed of a fan is adjusted by fixing a wind shield.
In order to solve the above technical problem, the present invention provides a fan rotation speed adjusting device, wherein the device comprises:
the temperature controller is used for generating a rotating speed adjusting signal according to the rotating speed requirement;
the input end of the current detection circuit is connected between the inverter and the fan and used for detecting the current input current of the fan;
and the input end of the digital signal processor DSP is respectively connected with the output end of the temperature controller and the output end of the current detection circuit and is used for adjusting the rotating speed of the fan according to the rotating speed adjusting signal and the current input current.
Further, the DSP comprises:
the input end of the parameter generation module is connected with the current detection circuit and used for generating a feedback parameter according to the current input current;
and the input end of the control module is connected with the temperature controller and the parameter generating module, and the output end of the control module is connected with the inverter and is used for adjusting the output current of the inverter according to the rotating speed adjusting signal and the feedback parameter so as to adjust the rotating speed of the fan.
Further, the feedback parameters include a first current parameter and a second current parameter, and the parameter generation module includes:
the first conversion unit is used for carrying out CLARKE conversion according to the current input current to generate a first current parameter;
the observer is used for estimating the current rotating speed information and the rotor position information according to the first current parameter and the fourth current parameter;
and the second conversion unit is used for carrying out PARK conversion according to the first current parameter and the rotor position information to generate a second current parameter.
Further, the control module includes:
the first PI controller is used for generating a current control signal according to the rotating speed adjusting signal and the rotating speed information;
the second PI controller is used for generating a third current parameter according to the current control signal and the second current parameter;
a third transformation unit, configured to perform inverse PARK transformation according to the third current parameter and the rotor position information to generate the fourth current parameter;
the pulse width modulation unit is used for outputting a pulse width modulation wave according to the fourth current parameter; the pulse width modulation wave is used for controlling the duty ratio of a switching tube in the inverter, and further controlling the output current of the inverter.
Further, the apparatus further comprises:
and the input end of the conversion circuit is connected with the temperature controller, and the output end of the conversion circuit is connected with the DSP and is used for converting the rotating speed regulating signal and transmitting the converted rotating speed regulating signal to the DSP.
Further, the conversion circuit is an operational amplifier circuit, and the operational amplifier circuit is specifically configured to scale down the rotation speed adjustment signal and transmit the scaled-down rotation speed adjustment signal to the DSP.
The invention also provides heat exchange equipment which comprises the fan and the fan rotating speed adjusting device.
Further, the heat exchange equipment at least comprises one of the following components:
air conditioner, refrigerator.
The invention also provides a fan rotating speed adjusting method, which is applied to the fan rotating speed adjusting device and comprises the following steps:
generating a rotating speed adjusting signal according to the rotating speed requirement;
acquiring the current input current of the fan;
and adjusting the rotating speed of the fan according to the rotating speed adjusting signal and the current input current.
Further, adjusting the fan speed according to the speed adjustment signal and the current input current comprises:
generating a feedback parameter according to the current input current;
and controlling the output current of the inverter according to the rotating speed adjusting signal and the feedback parameter so as to adjust the rotating speed of the fan.
Further, the feedback parameters include a first current parameter and a second current parameter, and the generating of the feedback parameters according to the current input current includes:
according to the current input current, CLARKE conversion is carried out to generate a first current parameter;
estimating current rotating speed information and rotor position information according to the first current parameter and the fourth current parameter;
and carrying out PARK conversion according to the first current parameter and the rotor position information to generate a second current parameter.
Further, controlling the output current of the inverter according to the rotation speed adjusting signal and the feedback parameter comprises:
generating a current control signal according to the rotating speed adjusting signal and the rotating speed information;
generating a third current parameter according to the current control signal and the second current parameter;
performing inverse PARK transform according to the third current parameter and the rotor position information to generate a fourth current parameter;
generating a pulse width modulation wave according to the fourth current parameter; the pulse width modulation wave is used for controlling the duty ratio of a switching tube in the inverter, and further controlling the output current of the inverter.
The present invention also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the above fan speed adjustment method.
By applying the technical scheme of the invention, the DSP is arranged, the input end of the DSP is respectively connected with the output end of the temperature controller and the output end of the current detection circuit, the rotating speed of the fan is adjusted according to the rotating speed adjusting signal and the current input current of the fan, so that the fan reaches the required rotating speed, the rotating speed of the fan can be finely adjusted, stepless speed regulation is realized, the debugging process is simplified, and the debugging efficiency is improved.
Drawings
Fig. 1 is a structural view of a fan rotation speed adjusting apparatus according to an embodiment of the present invention;
FIG. 2 is an internal structural diagram of a DSP according to an embodiment of the present invention;
FIG. 3 is a block diagram of a fan speed adjustment apparatus according to another embodiment of the present invention;
FIG. 4 is a schematic diagram of signal conversion according to an embodiment of the present invention;
fig. 5 is a flowchart of a method for adjusting a rotational speed of a fan according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. 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 invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, third, etc. may be used to describe the transformation units in the embodiments of the present invention, the transformation units should not be limited to these terms. These terms are only used to distinguish between transform units that implement different functions. For example, a first transform unit may also be referred to as a second transform unit, and similarly, a second transform unit may also be referred to as a first transform unit, without departing from the scope of embodiments of the present invention.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.
Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1
The present embodiment provides a fan speed adjusting apparatus, and fig. 1 is a structural diagram of a fan speed adjusting apparatus according to an embodiment of the present invention, and as shown in fig. 1, the apparatus is applied to a fan driving system, the driving system includes an alternating current power supply AC, a rectifier 1, a bus capacitor C, an inverter 2, and a fan 3, and the fan speed adjusting apparatus includes: the temperature controller 10 is used for generating a rotating speed adjusting signal according to the rotating speed requirement; the system further comprises a current detection circuit 20, wherein the input end of the current detection circuit 20 is connected between the inverter 2 and the fan 3 and is used for detecting the current input current of the fan 3; the fan speed regulation circuit further comprises a digital signal processor DSP30, wherein the input end of the DSP30 is respectively connected with the output end of the temperature controller 10 and the output end of the current detection circuit 20, and is used for regulating the fan speed according to a speed regulation signal generated by the temperature controller 10 and the current input current of the fan 3 detected by the current detection circuit 20.
In this embodiment, the output terminal of the temperature controller 10 is connected to an AD input pin (not shown) of the DSP30, the DSP30 performs 12-bit high-precision AD conversion on an analog signal output by the temperature controller 10, and converts the analog signal into a digital signal in proportion, the range of the digital signal is between 0 and 4095, the DSP30 converts the digital signal to obtain a corresponding rotation speed value, the rotation speed value is a rotation speed adjustment signal for adjusting the rotation speed of the fan, and the DSP30 may use a TMS320F2803x Piccolo of the Texas Instruments (TI) corporationTMA microcontroller (e.g., TMS320F28035) performs data processing operations.
The fan rotational speed adjusting device of this embodiment sets up digital signal processor DSP30, and the output of temperature controller and current detection circuit's output are connected respectively to its input, adjusts the fan rotational speed according to the current input current regulation signal of rotational speed regulating signal and fan, makes the fan reach the demand rotational speed, can finely tune the fan rotational speed, realizes stepless speed regulation, simplifies the debugging process, improves debugging efficiency.
Example 2
In this embodiment, another fan speed adjusting apparatus is provided, and fig. 2 is an internal structure diagram of a DSP according to an embodiment of the present invention, where in order to implement a combination of a speed adjusting signal and a current input current, a fan speed is adjusted, and a closed-loop feedback adjustment is implemented, as shown in fig. 2, the DSP30 includes: a parameter generating module 301, an input end of which is connected to the current detecting circuit, for generating a feedback parameter according to the current input current; the input end of the control module 302 is connected to a temperature controller (not shown in the figure) and the parameter generating module 301, and the output end is connected to the inverter 2, and is configured to adjust the output current of the inverter 2 according to a rotation speed adjusting signal output by the temperature controller and a feedback parameter generated by the parameter generating module 301, so as to adjust the rotation speed of the fan.
In order to generate the feedback parameter according to the current input current of the fan 3, as shown in fig. 3, the parameter generating module 301 includes: the observer 301b is used for estimating current rotating speed information Wr and rotor position information thetar according to the first current parameter and the fourth current parameter; the second transformation unit 301c is configured to perform PARK transformation according to the first current parameter and the current rotor position information θ r to generate a second current parameter.
In a specific implementation, first, the current input current of the fan 3 is detected through the current detection circuit 20, specifically, the current detection circuit 20 may include a first detection resistor R1 and a second detection resistor R2, the first detection resistor R1 is disposed between the first phase line of the fan 3 and the DSP30 and is used for obtaining a first phase current ia of the fan 3, and the second detection resistor R2 is disposed between the second phase line of the fan 3 and the DSP30 and is used for obtaining a second phase current ib of the fan 3; then, the first transforming unit 301b performs CLARKE transformation on the first phase current ia and the second phase current ib, and transforms the first phase current ia and the second phase current ib of the fan into an α -axis current component i α and a β -axis current component i β through CLARKE transformation, where the α -axis current component i α and the β -axis current component i β are first current parameters; finally, the second transformation unit 301c transforms the α -axis current component i α and the β -axis current component i β into a direct-axis current id and a quadrature-axis current iq through PARK transformation, where the direct-axis current id and the quadrature-axis current iq are second current parameters.
In order to control the fan speed based on the above-mentioned direct-axis current id, quadrature-axis current iq and speed adjustment signal, as shown in fig. 2, the control module 302 includes: a first PI controller 302a for performing proportional integral on the difference between the rotation speed adjustment signal and the rotation speed information Wr to generate a current control signal; the second PI controller 302b is configured to perform proportional integration on the current control signal, the direct-axis current id and the quadrature-axis current iq to generate an integrated direct-axis current id1 and an integrated quadrature-axis current iq1, where the integrated direct-axis current id1 and the integrated quadrature-axis current iq1 are third current parameters;
a third transformation unit 302c, configured to perform PARK inverse transformation on the basis of the integrated direct-axis current id1, the integrated quadrature-axis current iq1, and the rotor position information θ r to generate an α -axis current component i α 1 at the next time and a β -axis current component i β 1 at the next time, where the α -axis current component i α 1 at the next time and the β -axis current component i β 1 at the next time are fourth current parameters; a pulse width modulation unit 302d for outputting a pulse width modulation wave PWM according to the α -axis current component i α 1 at the next time and the β -axis current component i β 1 at the next time; the PWM wave PWM is used to control the duty ratio of the switching tube in the inverter 2, and further control the output current of the inverter 2, and finally realize the adjustment of the rotational speed of the fan, so that the rotational speed of the fan reaches the rotational speed required by the rotational speed adjustment signal.
Fig. 3 is a structural diagram of a fan rotation speed adjusting device according to another embodiment of the present invention, an output interface of a general thermostat outputs a 0-10V voltage signal or a 0-20 mA current signal, the current or voltage signal is an analog signal, and the analog signal needs to be filtered and converted into a 0-3V analog voltage signal to be safely and reliably received by the DSP30, so as shown in fig. 3, the device further includes: and the input end of the conversion circuit 40 is connected with the temperature controller 10, and the output end of the conversion circuit is connected with the DSP30, and the conversion circuit is used for converting the rotating speed adjusting signal and transmitting the rotating speed adjusting signal to the DSP 30. In this embodiment, the converting circuit 40 may be an operational amplifier circuit, which includes a resistor and an operational amplifier, and scales down the rpm adjusting signal by designing the resistance of the resistor, and transmits the scaled rpm adjusting signal to the DSP 30.
Fig. 4 is a schematic diagram of signal conversion according to an embodiment of the present invention, and as shown in fig. 4, an output interface of a temperature controller outputs a 0-10V voltage signal or a 0-20 mA current signal, which is converted into a 0-3V analog voltage signal by a conversion circuit 40, and then the signal is input to an AD pin (not shown) of a DSP30, and then the signal is subjected to 12-bit high-precision AD conversion by a DSP30 to be converted into a digital signal within a range of 0-4095, and finally the digital signal is converted into a corresponding rotation speed value.
Example 3
The present embodiment provides a fan speed adjusting method, which is applied to the fan speed adjusting device in the foregoing embodiments, and fig. 5 is a flowchart of the fan speed adjusting method according to the embodiment of the present invention, as shown in fig. 5, the method includes:
and S101, generating a rotating speed adjusting signal according to the rotating speed requirement.
In specific implementation, a general temperature controller outputs a 0-10V voltage signal or a 0-20 mA current signal through an output interface according to the rotating speed requirement of a control user to serve as a rotating speed adjusting signal, the signal is converted into a 0-3V analog voltage signal through a conversion circuit, then 12-bit high-precision AD conversion is carried out through a DSP to be converted into a digital signal within the range of 0-4095, and finally the digital signal is converted into a rotating speed value.
And S102, acquiring the current input current of the fan.
In order to obtain the input current of the fan, a current detection circuit is provided, which may include a first detection resistor and a second detection resistor, where the first detection resistor is disposed between a first phase line of the fan and the DSP for obtaining a first phase current ia, and the second detection resistor is disposed between a second phase line of the fan and the DSP for obtaining a second phase current ib.
It should be noted that the execution sequence of step S101 and step S102 is not limited, step S101 may be executed first, and then step S102 may be executed, step S102 may be executed first, and then step S101 may be executed, or both of the above steps may be executed at the same time, and the present invention is not limited in particular.
And S103, adjusting the rotating speed of the fan according to the rotating speed adjusting signal and the current input current.
According to the fan rotating speed adjusting method, firstly, a rotating speed adjusting signal is generated according to a rotating speed requirement, meanwhile, the current input current of the fan is obtained, the rotating speed of the fan is adjusted according to the rotating speed adjusting signal and the current input current, the fan reaches the required rotating speed, the rotating speed of the fan can be finely adjusted, stepless speed regulation is achieved, the debugging process is simplified, and the debugging efficiency is improved.
In order to realize the combination of the rotation speed adjusting signal and the current input current, the rotation speed of the fan is adjusted, and the closed-loop feedback adjustment is realized, step S103 specifically includes: generating a feedback parameter according to the current input current; and controlling the output current of the inverter according to the rotating speed adjusting signal and the feedback parameter so as to adjust the rotating speed of the fan. The feedback parameters include a first current parameter and a second current parameter, and the feedback parameters are generated according to the current input current, and specifically include: according to the current input current, CLARKE conversion is carried out to generate a first current parameter; estimating current rotating speed information and rotor position information according to the first current parameter and the fourth current parameter; and carrying out PARK conversion according to the first current parameter and the rotor position information to generate a second current parameter.
In specific implementation, first, a first phase current ia and a second phase current ib of the fan are obtained through a current detection circuit; then, the first transformation unit performs CLARKE transformation on the first phase current ia and the second phase current ib, and the first phase current ia and the second phase current ib of the fan are transformed into an alpha-axis current component i alpha and a beta-axis current component i beta through the CLARKE transformation, wherein the alpha-axis current component i alpha and the beta-axis current component i beta are first current parameters; finally, the second transformation unit 301c transforms the α -axis current component i α and the β -axis current component i β into a direct-axis current id and a quadrature-axis current iq through PARK transformation, where the direct-axis current id and the quadrature-axis current iq are second current parameters.
In order to realize the control of the rotating speed of the fan based on the direct-axis current id, the quadrature-axis current iq and the rotating speed adjusting signal, the method specifically comprises the following steps of: generating a current control signal according to a rotating speed adjusting signal and the rotating speed information Wr; generating a third current parameter according to the current control signal and the second current parameter; performing PARK inverse transformation according to the third current parameter and the rotor position information to generate a fourth current parameter; generating a pulse width modulation wave according to the fourth current parameter; the PWM wave is used for controlling the duty ratio of a switching tube in the inverter, further controlling the output current of the inverter and finally controlling the rotating speed of the fan.
Specifically, a first PI controller is used for carrying out proportional integral operation on a difference value between a rotating speed adjusting signal and rotating speed information Wr to generate a current control signal; proportional integral operation is carried out on the current control signal, the direct-axis current id and the quadrature-axis current iq through a second PI controller, an integrated direct-axis current id1 and an integrated quadrature-axis current iq1 are generated, and the integrated direct-axis current id1 and the integrated quadrature-axis current iq1 are third current parameters; then, a third transformation unit carries out PARK inverse transformation according to the integrated direct-axis current id1, the integrated quadrature-axis current iq1 and the rotor position information theta r to generate an alpha-axis current component i alpha 1 at the next moment and a beta-axis current component i beta 1 at the next moment, wherein the alpha-axis current component i alpha 1 at the next moment and the beta-axis current component i beta 1 at the next moment are fourth current parameters; finally, outputting a Pulse Width Modulation (PWM) wave according to the alpha-axis current component i alpha 1 at the next moment and the beta-axis current component i beta 1 at the next moment through a PWM unit; the PWM is used for controlling the duty ratio of a switching tube in the inverter, further controlling the output current of the inverter, and finally realizing the adjustment of the rotating speed of the fan to ensure that the rotating speed of the fan reaches the rotating speed required by the rotating speed adjusting signal.
The output interface of a general temperature controller outputs a 0-10V voltage signal or a 0-20 mA current signal, the current or voltage signal is an analog signal, and the analog signal is converted into a 0-3V analog voltage signal after being filtered and converted by a filter circuit, so that the analog signal can be safely and reliably received by a DSP, therefore, the method further comprises the following steps: converting a 0-10V voltage signal or a 0-20 mA current signal output by an output interface of the temperature controller into a 0-3V analog voltage signal, and inputting the signal into an AD pin of a DSP (digital signal processor); the DSP performs 12-bit high-precision AD conversion on the analog voltage signal to generate a digital signal within the range of 0-4095; the digital signal is converted into a bit rotation speed value. Through the steps, the output signal of the temperature controller is converted into the rotating speed adjusting signal.
Example 4
The present embodiment provides another fan speed adjusting method, which is applied to the fan speed adjusting device shown in fig. 3, as shown in fig. 3, the fan speed adjusting device mainly includes an AC power supply AC, a rectifier 1, an inverter 2, a fan 3, a temperature controller 10, a current detection circuit 20, a DSP30, a conversion circuit 40, and so on.
An output interface of a general temperature controller outputs a 0-10V voltage signal or a 0-20 mA current signal, the current or voltage signal is an analog signal, the analog signal needs to be converted into a 0-3V analog voltage signal through a filter and conversion circuit, and then can be safely and reliably received by the DSP30, therefore, as shown in FIG. 4, the output interface of the temperature controller outputs a 0-10V voltage signal or a 0-20 mA current signal, the analog voltage signal is converted into a 0-3V analog voltage signal through a conversion circuit 40, and then the analog voltage signal is input into an AD pin (not shown in the figure) of the DSP30, and is subjected to 12-bit high-precision AD conversion through the DSP30, and is converted into a digital signal within a range of 0-4095, and finally the digital signal is converted into a rotation speed value. In the present embodiment, TMS320F2803x Piccolo, product of Texas Instruments (TI) may be used as DSP30TMA microcontroller (e.g., TMS320F28035) performs data processing operations.
Finally, as shown in the above-mentioned fig. 2, the first phase current ia and the second phase current ib of the fan are input to the DSP30, and through Clark and Park coordinate transformation, current models in a stationary coordinate system and a rotating coordinate system are obtained, respectively, and the observer estimates the speed and the position of the rotor according to the current models in the stationary coordinate system and the rotating coordinate system, and then feeds back the speed and the position to the closed-loop control. Software in the DSP30 continuously performs closed-loop regulation to lead the output rotating speed to be infinitely close to the rotating speed required by the rotating speed regulating signal through rotating speed and current double-loop control operation according to the error between the rotating speed regulating signal and the current rotating speed information. Therefore, the stepless speed regulation of the fan is realized by combining the analog circuit and the digital control.
The stepless speed regulation method of the embodiment brings great convenience to the debugging process, can reduce the debugging cost, improve the debugging precision and greatly reduce the labor intensity. Meanwhile, the fan coil is applied to products, so that the fan coil can be matched by users freely, the product adaptability of the fan coil can be improved, the performance of the direct-current fan coil is ensured, the product competitiveness is improved, and the user satisfaction can be improved.
Example 5
The invention also provides heat exchange equipment which comprises the fan and the fan rotating speed adjusting device and is used for realizing stepless speed regulation so as to simplify the debugging process and improve the debugging efficiency. The heat exchange equipment in this embodiment at least includes one of the following: air conditioner, refrigerator.
Example 6
The present embodiment provides a computer-readable storage medium on which a computer program is stored, which when executed by a processor implements the above-described fan rotational speed adjustment method.
The above-described embodiments of the apparatus are merely illustrative, and the 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 modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (13)
1. A fan speed adjustment device, the device comprising:
the temperature controller is used for generating a rotating speed adjusting signal according to the rotating speed requirement;
the input end of the current detection circuit is connected between the inverter and the fan and used for detecting the current input current of the fan;
and the input end of the digital signal processor DSP is respectively connected with the output end of the temperature controller and the output end of the current detection circuit and is used for adjusting the rotating speed of the fan according to the rotating speed adjusting signal and the current input current.
2. The apparatus of claim 1, wherein the DSP comprises:
the input end of the parameter generation module is connected with the current detection circuit and used for generating a feedback parameter according to the current input current;
and the input end of the control module is connected with the temperature controller and the parameter generating module, and the output end of the control module is connected with the inverter and is used for adjusting the output current of the inverter according to the rotating speed adjusting signal and the feedback parameter so as to adjust the rotating speed of the fan.
3. The apparatus of claim 2, wherein the feedback parameters comprise a first current parameter and a second current parameter, and wherein the parameter generation module comprises:
the first conversion unit is used for carrying out CLARKE conversion according to the current input current to generate a first current parameter;
the observer is used for estimating the current rotating speed information and the rotor position information according to the first current parameter and the fourth current parameter;
and the second conversion unit is used for carrying out PARK conversion according to the first current parameter and the rotor position information to generate a second current parameter.
4. The apparatus of claim 3, wherein the control module comprises:
the first PI controller is used for generating a current control signal according to the rotating speed adjusting signal and the rotating speed information;
the second PI controller is used for generating a third current parameter according to the current control signal and the second current parameter;
a third transformation unit, configured to perform inverse PARK transformation according to the third current parameter and the rotor position information to generate the fourth current parameter;
the pulse width modulation unit is used for outputting a pulse width modulation wave according to the fourth current parameter; the pulse width modulation wave is used for controlling the duty ratio of a switching tube in the inverter, and further controlling the output current of the inverter.
5. The apparatus of claim 1, further comprising:
and the input end of the conversion circuit is connected with the temperature controller, and the output end of the conversion circuit is connected with the DSP and is used for converting the rotating speed regulating signal and transmitting the converted rotating speed regulating signal to the DSP.
6. The apparatus of claim 5, wherein the conversion circuit is an operational amplifier circuit, and wherein the operational amplifier circuit is configured to scale down the speed adjustment signal and transmit the scaled speed adjustment signal to the DSP.
7. A heat exchange device comprising a fan, characterized in that the heat exchange device further comprises a fan speed adjusting device as claimed in any one of claims 1 to 6.
8. The heat exchange device of claim 7, wherein the heat exchange device comprises at least one of:
air conditioner, refrigerator.
9. A fan rotation speed adjustment method applied to the fan rotation speed adjustment device according to any one of claims 1 to 6, characterized by comprising:
generating a rotating speed adjusting signal according to the rotating speed requirement;
acquiring the current input current of the fan;
and adjusting the rotating speed of the fan according to the rotating speed adjusting signal and the current input current.
10. The method of claim 9, wherein adjusting fan speed based on the speed adjustment signal and the present input current comprises:
generating a feedback parameter according to the current input current;
and controlling the output current of the inverter according to the rotating speed adjusting signal and the feedback parameter so as to adjust the rotating speed of the fan.
11. The method of claim 10, wherein the feedback parameters include a first current parameter and a second current parameter, and wherein generating the feedback parameters based on the present input current comprises:
according to the current input current, CLARKE conversion is carried out to generate a first current parameter;
estimating current rotating speed information and rotor position information according to the first current parameter and the fourth current parameter;
and carrying out PARK conversion according to the first current parameter and the rotor position information to generate a second current parameter.
12. The method of claim 11, wherein controlling an output current of an inverter based on the speed regulation signal and the feedback parameter comprises:
generating a current control signal according to the rotating speed adjusting signal and the rotating speed information;
generating a third current parameter according to the current control signal and the second current parameter;
performing inverse PARK transform according to the third current parameter and the rotor position information to generate a fourth current parameter;
generating a pulse width modulation wave according to the fourth current parameter; the pulse width modulation wave is used for controlling the duty ratio of a switching tube in the inverter, and further controlling the output current of the inverter.
13. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the method according to any one of claims 9 to 12.
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