CN215990562U - PFC carrier frequency control device, PFC controller and air conditioner - Google Patents
PFC carrier frequency control device, PFC controller and air conditioner Download PDFInfo
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Abstract
The application discloses a PFC carrier frequency control device, a PFC controller and an air conditioner, wherein the PFC carrier frequency control device comprises an electric parameter acquisition module and a frequency determination module which are electrically connected; the electric parameter acquisition module is used for acquiring a real-time electric signal during the operation of the PFC circuit, wherein the real-time electric signal comprises a first voltage signal, and the first voltage signal is an alternating current voltage signal input into the PFC circuit; the frequency determination module is used for determining the real-time carrier frequency of the PFC circuit according to the first voltage signal and a preset frequency interval so as to control the PFC circuit through the real-time carrier frequency. The method and the device can enable the carrier frequency of the PFC circuit to change along with the input alternating voltage signal, avoid the problem that the switching loss of a power device is increased because the carrier frequency is always at a high carrier frequency, can reduce the inductive current ripple of the PFC circuit, reduce harmonic waves, reduce the switching loss and improve the reliability of the PFC circuit.
Description
Technical Field
The application relates to the technical field of air conditioners, in particular to a PFC carrier frequency control device, a PFC controller and an air conditioner.
Background
The conventional air conditioner external unit controller generally adopts a one-way boost (boost) type Power Factor Correction (PFC) circuit to perform Power Factor Correction. The Active Power Factor Correction (APFC) technology is generally adopted, and the APFC technology has the advantages of improving the Power Factor of the Power electronic device on the network side, reducing the line loss, saving energy, reducing the harmonic pollution of the Power network, improving the Power supply quality of the Power network and the like, and is widely applied in many industries.
The APFC technology performs power factor correction by adjusting the duty ratio of a power device with a carrier wave of a fixed frequency, and since a high carrier frequency is advantageous for reducing current ripples of an inductor and reducing harmonics, the carrier frequency used in the APFC is generally high.
However, the higher the carrier frequency is, the more the switching times of the power device in one input power source cycle are, and the power device generates a large amount of heat in the process of continuously switching at a high speed, so that the switching loss is greatly increased, and the normal operation of the power factor correction circuit is further influenced.
SUMMERY OF THE UTILITY MODEL
The application provides a PFC carrier frequency control device, a PFC controller and an air conditioner, and aims to solve the problem that in the prior art, a PFC technology adopts high carrier frequency, so that the switching loss of a power device is increased, and a power factor correction circuit is unreliable.
In a first aspect, the present application provides a PFC carrier frequency control device, including an electrical parameter acquisition module and a frequency determination module electrically connected to each other, the electrical parameter acquisition module being electrically connected to a PFC circuit;
the device comprises an electrical parameter acquisition module, a frequency determination module and a power factor correction module, wherein the electrical parameter acquisition module is used for acquiring a real-time electrical signal when the PFC circuit operates and transmitting the real-time electrical signal to the frequency determination module, the real-time electrical signal comprises a first voltage signal, and the first voltage signal is an alternating current voltage signal input into the PFC circuit;
and the frequency determining module is used for determining the real-time carrier frequency of the PFC circuit according to the first voltage signal and a preset frequency interval so as to control the PFC circuit through the real-time carrier frequency.
In one possible implementation manner of the application, the electrical parameter acquisition module includes a first voltage sampling unit and a peak detection unit, which are electrically connected, and the first voltage sampling unit is electrically connected with a power input end of the PFC circuit;
the first voltage sampling unit is used for sampling the first voltage signal in real time to obtain a real-time first voltage value and transmitting the real-time sampled first voltage signal to the peak value detection unit;
and the peak value detection unit is used for detecting the voltage peak value of the first voltage signal in the power supply period to obtain the first voltage maximum value.
In one possible implementation manner of the present application, the preset frequency interval includes two frequency thresholds, where the two frequency thresholds are a maximum frequency value and a minimum frequency value, respectively, and the frequency determining module includes a frequency difference value calculating unit and a carrier frequency calculating unit;
the frequency difference value calculating unit is used for calculating to obtain a fixed frequency difference value according to the maximum frequency value and the minimum frequency value;
and the carrier frequency calculating unit is used for calculating the real-time carrier frequency according to the minimum frequency value, the fixed frequency difference value, the first voltage maximum value and the real-time first voltage value.
In one possible implementation manner of the present application, the carrier frequency calculating unit is specifically configured to:
calculating to obtain a real-time voltage difference value according to the first voltage maximum value and the real-time first voltage value, wherein the real-time voltage difference value is used for representing the difference value between the first voltage maximum value and the real-time first voltage value;
calculating to obtain a real-time voltage ratio according to the real-time voltage difference value and the first voltage maximum value, wherein the real-time voltage ratio is used for representing the proportional relation between the real-time voltage difference value and the first voltage maximum value;
obtaining a carrier frequency fluctuation value according to the product of the real-time voltage ratio and the fixed frequency difference value;
and calculating to obtain the real-time carrier frequency according to the minimum frequency value and the carrier frequency fluctuation value.
In a possible implementation manner of the present application, the PFC carrier frequency control apparatus further includes a control module, and the control module is electrically connected to the frequency determination module and the PFC circuit, respectively;
the frequency determination module is also used for transmitting the real-time carrier frequency to the control module;
and the control module is used for controlling the power device of the PFC circuit to work according to the real-time carrier frequency.
In a second aspect, the present application further provides a PFC controller, where the PFC controller includes a pulse width modulation module and the PFC carrier frequency control device of the first aspect, the PFC carrier frequency control device is configured to output a real-time carrier frequency, and the pulse width modulation module is configured to output a pulse width modulation signal and adjust the pulse width modulation signal according to the real-time carrier frequency, so as to control a power device of the PFC circuit to operate according to the adjusted pulse width modulation signal.
In a possible implementation manner of the present application, the PFC controller further includes a duty cycle determination module, the duty cycle determination module is electrically connected to the electrical parameter acquisition module and the pulse width modulation module, respectively, and the real-time electrical signal further includes a bus voltage signal and a loop current signal of the PFC circuit;
the duty ratio determining module is used for determining the duty ratio of the pulse width modulation signal according to the bus voltage signal, the loop current signal and the first voltage signal and transmitting the duty ratio to the pulse width modulation module;
and the pulse width modulation module is also used for adjusting the pulse width modulation signal according to the duty ratio so as to control the power device of the PFC circuit to work through the adjusted pulse width modulation signal.
In one possible implementation manner of the present application, the electrical parameter obtaining module further includes a bus voltage sampling unit, and the bus voltage sampling unit is electrically connected to the output end of the PFC circuit and the duty ratio determining module, respectively;
and the bus voltage sampling unit is used for sampling a bus voltage signal of the PFC circuit in real time to obtain a real-time bus voltage value and transmitting the real-time bus voltage value to the duty ratio determining module.
In one possible implementation manner of the present application, the electrical parameter obtaining module further includes a loop current sampling unit, and the loop current sampling unit is electrically connected to the output end of the power device of the PFC circuit and the duty ratio determining module, respectively;
and the loop current sampling unit is used for sampling a loop current signal in real time to obtain a real-time loop current value and transmitting the real-time loop current value to the duty ratio determining module.
In a third aspect, the present application further provides an air conditioner, which includes a PFC circuit, and the PFC carrier frequency control apparatus of the first aspect and/or the PFC controller of the second aspect.
From the above, the present application has the following advantageous effects:
in the application, the real-time electrical signal during the operation of the PFC circuit is obtained through the electrical parameter obtaining module, for example, the first voltage signal is an alternating current voltage signal input to the PFC circuit, and therefore, the frequency determining module determines the real-time carrier frequency according to the first voltage signal and a preset frequency interval, so that the carrier frequency of the PFC circuit can be changed along with the input alternating current voltage signal, the problem that the switching loss of a power device is increased due to the fact that the carrier frequency is always at a high carrier frequency is solved, and the normal operation of the PFC circuit is ensured due to the fact that the frequency interval is preset, so that inductive current ripples of the PFC circuit can be reduced, harmonics can be reduced, switching loss can be reduced, and the reliability of the PFC circuit is improved.
Drawings
In order to more clearly illustrate the technical solutions in the present application, the drawings that are needed to be used in the description of the present application will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without inventive effort.
Fig. 1 is a schematic circuit diagram of a PFC circuit provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram of a PFC carrier frequency control apparatus provided in an embodiment of the present application;
fig. 3 is another schematic structural diagram of a PFC carrier frequency control apparatus provided in an embodiment of the present application;
fig. 4 is a schematic diagram of a PFC simulation waveform of a PFC control method according to the prior art in the embodiment of the present application;
fig. 5 is a schematic diagram of a PFC simulation waveform of a PFC carrier frequency based control device in an embodiment of the present application;
fig. 6 is a schematic structural diagram of a PFC controller provided in an embodiment of the present application;
fig. 7 is a schematic structural diagram of an air conditioner provided in an embodiment of the present application.
Detailed Description
The technical solutions in the present application will be described clearly and completely with reference to the accompanying drawings in the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and 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 application.
In the description of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be considered as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In this application, the word "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the application. In the following description, details are set forth for the purpose of explanation. It will be apparent to one of ordinary skill in the art that the present application may be practiced without these specific details. In other instances, well-known structures and processes are not set forth in detail in order to avoid obscuring the description of the present application with unnecessary detail. Thus, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.
Before introducing the PFC carrier frequency control device, the PFC controller, and the air conditioner of the present application, first, a PFC circuit related to the present application is briefly introduced, please refer to fig. 1, fig. 1 is a schematic circuit diagram of the PFC circuit provided in the embodiment of the present application, the PFC circuit 100 is a single-phase boost PFC circuit, specifically, the PFC circuit 100 includes an Alternating Current (AC) power supply, a rectifier bridge DB, an inductor L1, an Insulated Gate Bipolar Transistor (IGBT), a fast recovery diode D1, and a bus capacitor C1, where the Insulated Gate Bipolar Transistor IGBT is a power device Q1.
The specific circuit structure of the PFC circuit 100 is as follows: the alternating current power supply AC is connected with a rectifier bridge DB, a first output end of the rectifier bridge DB is connected with a first end of an inductor L1, a second end of the inductor L1 is respectively connected with a collector of a power device Q1 and an anode of a fast recovery diode D1, a second output end of the rectifier bridge DB is connected with an emitter of the power device Q1 and is grounded GND, a cathode of the fast recovery diode D1 is connected with a first end of a bus capacitor C1, a second end of the bus capacitor C1 is grounded GND, and a load is connected with the bus capacitor C1 in parallel.
It can be understood that the base of the power device Q1 is connected to a control terminal, which can output a Pulse Width Modulation (PWM) signal, such as the PFC-PWM signal in fig. 1, to control the operating state of the power device Q1, and since the PFC circuit 100 can be used to boost the output voltage, the switching time of the power device Q1 can be controlled by adjusting the duty ratio and the carrier frequency of the PFC-PWM signal, so that the final output voltage output by the PFC circuit 100 to the load reaches a desired value.
Based on the PFC circuit 100, the PFC carrier frequency control device, the PFC controller, and the air conditioner provided in the present application will be described in detail.
As shown in fig. 2, fig. 2 is a schematic structural diagram of a PFC carrier frequency control device provided in this embodiment, the PFC carrier frequency control device 800 includes an electrical parameter obtaining module 200 and a frequency determining module 300, which are electrically connected, and the electrical parameter obtaining module 200 is electrically connected to the PFC circuit 100.
The electrical parameter obtaining module 200 may be configured to obtain a real-time electrical signal when the PFC circuit 100 operates, and transmit the real-time electrical signal to the frequency determining module 300, where the real-time electrical signal may include a first voltage signal, and the first voltage signal is an ac voltage signal input to the PFC circuit 100.
The frequency determining module 300 may be configured to determine a real-time carrier frequency of the PFC circuit 100 according to the first voltage signal and a preset frequency interval, so as to control the PFC circuit 100 through the real-time carrier frequency.
Since the electrical parameter obtaining module 200 can obtain the real-time electrical signal generated when the PFC circuit 100 operates, the electrical parameter obtaining module 200 can be directly electrically connected to the PFC circuit 100, specifically, the real-time electrical signal includes a first voltage signal, and the first voltage signal is an ac voltage signal input to the PFC circuit 100, therefore, the electrical parameter obtaining module 200 can be connected to the first end of the inductor L1, that is, the electrical parameter obtaining module 200 is connected between the rectifier bridge DB and the inductor L1, the first voltage signal is an ac voltage signal rectified by the rectifier bridge DB, and at this time, a waveform of the first voltage signal is a positive wave.
It is understood that the electrical parameter obtaining module 200 may also be connected to the output terminal of the alternating current power source AC, that is, the electrical parameter obtaining module 200 is connected between the alternating current power source AC and the rectifier bridge DB, in this case, the first voltage signal is an alternating current voltage signal with a sinusoidal waveform provided by the alternating current power source AC.
In the embodiment of the present application, a frequency interval is preset, and the frequency interval is used for limiting a value range of the carrier frequency, and the frequency determining module 300 determines the real-time carrier frequency of the PFC circuit 100 according to the first voltage signal and the frequency interval, so that the real-time carrier frequency can change along with the change of the first voltage signal, and is no longer a fixed high carrier frequency, and the real-time carrier frequency is limited in the range of the frequency interval, so that reliable control over the PFC circuit 100 can be ensured.
In the embodiment of the present application, the real-time electrical signal generated when the PFC circuit 100 operates is obtained through the electrical parameter obtaining module 200, for example, the first voltage signal is an ac voltage signal input to the PFC circuit 100, and therefore, the frequency determining module 300 determines the real-time carrier frequency according to the first voltage signal and the preset frequency interval, so that the carrier frequency of the PFC circuit 100 can be changed along with the input ac voltage signal, thereby avoiding the problem that the switching loss of the power device is increased due to the high carrier frequency all the time, and because the frequency interval is preset, it can be ensured that the real-time carrier frequency is always within the preset frequency interval, thereby ensuring the normal operation of the PFC circuit, reducing the inductive current ripple of the PFC circuit 100, reducing the harmonic, reducing the switching loss, and improving the reliability of the PFC circuit 100.
Referring to fig. 3, fig. 3 is another schematic structural diagram of the PFC carrier frequency control apparatus in the embodiment of the present application, in some embodiments of the present application, the electrical parameter obtaining module 200 may include a first voltage sampling unit 201 and a peak detecting unit 202, which are electrically connected, where the first voltage sampling unit 201 is electrically connected to a power input terminal of the PFC circuit 100.
The first voltage sampling unit 201 may be configured to sample the first voltage signal in real time to obtain a real-time first voltage value, and transmit the real-time sampled first voltage signal to the peak detection unit 202.
The peak detection unit 202 may be configured to detect a voltage peak of the first voltage signal in a power cycle, so as to obtain a first voltage maximum.
In the embodiment of the present application, the example that the electrical parameter obtaining module 200 is connected between the rectifier bridge DB and the inductor L1 shown in fig. 1 is taken as an example for explanation, it can be understood that the first voltage sampling unit is connected between the rectifier bridge DB and the inductor L1, and at this time, the first voltage signal is an ac voltage signal which is rectified by the rectifier bridge DB and has a shape of a steamed bun waveform.
It is understood that the voltage sampling is to acquire the voltage value of the monitoring point, and therefore, the first voltage sampling unit 201 acquires the real-time first voltage value input to the inductor L1. The first voltage sampling unit 201 may be any one of the existing voltage sampling devices or voltage sampling circuits, such as a resistance voltage divider circuit.
Taking a power cycle as an example, since the first voltage signal is an ac voltage signal rectified by the rectifier bridge DB, the first voltage signal has a peak, i.e. a maximum value in the power cycle, where the maximum value can represent an effective value of the first voltage signal. In this embodiment, the peak detecting unit 202 may analyze the first voltage signal to determine a maximum value of the first voltage signal, where the maximum value is a first maximum voltage value.
In the embodiment of the present application, the peak detecting unit 202 may be an analog peak detector or a digital peak detector, wherein the analog peak detector stores the peak value of the first voltage signal in the form of voltage on the capacitor, and the digital peak detector screens out the maximum value of the first voltage signal.
Continuing to refer to fig. 3, in some embodiments of the present application, the preset frequency interval may include two frequency thresholds, which may be a maximum frequency value, such as FreqMax, and a minimum frequency value, such as FreqMin, respectively, and the frequency determination module 300 may include a frequency difference calculation unit 301 and a carrier frequency calculation unit 302;
the frequency difference calculation unit 301 may be configured to calculate a fixed frequency difference Δ Freq according to the maximum frequency value FreqMax and the minimum frequency value FreqMin;
the carrier frequency calculation unit 302 may be configured to calculate the real-time carrier frequency based on the minimum frequency value FreqMin, the fixed frequency difference Δ Freq, the first voltage maximum value, e.g., VdbMax, and the real-time first voltage value, e.g., Vdb.
It can be understood that the frequency interval may be used to limit the value of the real-time carrier frequency, and the final real-time carrier frequency is limited within the set frequency interval, that is, the maximum real-time carrier frequency does not exceed the maximum frequency value, and the minimum real-time carrier frequency is not lower than the minimum frequency value, so that the node and range of the frequency interval may be selected according to the actual application scenario, which is not limited herein.
Assuming that the frequency interval is set to [40, 150] kHz in this embodiment, the maximum frequency value FreqMax is 150kHz, the minimum frequency value FreqMin is 40kHz, that is, the finally obtained real-time carrier frequency does not exceed 150kHz at most, and the minimum frequency is not lower than 40kHz at most, therefore, in this embodiment, the frequency difference calculation unit 301 calculates the fixed frequency difference Δ Freq-FreqMin as 150kHz-40kHz as 110kHz from the maximum frequency value FreqMax 150kHz and the minimum frequency value FreqMin 40 kHz.
Further, in this embodiment of the application, the carrier frequency calculating unit 302 may specifically be configured to:
calculating to obtain a real-time voltage difference value according to the first voltage maximum value and the real-time first voltage value, wherein the real-time voltage difference value is used for representing the difference value between the first voltage maximum value and the real-time first voltage value; calculating to obtain a real-time voltage ratio according to the real-time voltage difference value and the first voltage maximum value, wherein the real-time voltage ratio is used for representing the proportional relation between the real-time voltage difference value and the first voltage maximum value; obtaining a carrier frequency fluctuation value according to the product of the real-time voltage ratio and the fixed frequency difference value; and calculating to obtain the real-time carrier frequency according to the minimum frequency value and the carrier frequency fluctuation value.
It can be understood that, since the first voltage signal has a maximum value within one power supply cycle, i.e. the first voltage maximum value VdbMax, and the real-time first voltage value Vdb is a voltage value that varies with time between 0 and the first voltage maximum value VdbMax, the difference between the first voltage maximum value VdbMax and the real-time first voltage value Vdb also varies in real time, i.e. the real-time voltage difference is a difference obtained by subtracting the real-time first voltage value Vdb from the first voltage maximum value VdbMax.
Since the real-time voltage ratio is a proportional relationship between the real-time voltage difference (VdbMax-Vdb) and the first voltage maximum value VdbMax, the real-time voltage ratio is (VdbMax-Vdb)/VdbMax, and then the carrier frequency fluctuation value calculation formula can be obtained according to the product of the real-time voltage ratio (VdbMax-Vdb)/VdbMax and the fixed frequency difference Δ Freq:
ΔF＝ΔFreq*(VdbMax-Vdb)/VdbMax。
according to the calculation formula of the carrier frequency fluctuation value Δ F, it can be known that when the real-time first voltage value Vdb is 0, the carrier frequency fluctuation value Δ F is equal to the fixed frequency difference value Δ Freq; and when the real-time first voltage value Vdb is the peak value, that is, the first voltage maximum value VdbMax, the carrier frequency fluctuation value Δ F is 0, and since the real-time carrier frequency needs to be limited within the frequency interval, the minimum frequency value FreqMin is added on the basis of the carrier frequency fluctuation value Δ F after the carrier frequency fluctuation value Δ F is obtained, so that the real-time carrier frequency can be ensured within the frequency interval of the maximum frequency value FreqMax and the minimum frequency value FreqMin.
To sum up, the calculation of the real-time carrier frequency FreqRef can be expressed as:
FreqRef＝FreqMin+ΔFreq*(VdbMax-Vdb)/VdbMax
specifically, when the real-time first voltage value Vdb is 0, the real-time carrier frequency is the maximum frequency value FreqMax; when the real-time first voltage value Vdb is a peak value, that is, the first voltage maximum value VdbMax, the real-time carrier frequency is the minimum frequency value FreqMin, so that the real-time carrier frequency is lower as the real-time first voltage value Vdb is closer to the peak value in one power supply period, and the real-time carrier frequency is higher as the real-time first voltage value Vdb is closer to the zero point, that is, the real-time carrier frequency can be changed along with the change of the real-time first voltage value Vdb.
As shown in fig. 4, fig. 4 is a schematic diagram of a PFC simulated waveform based on a PFC control method in the prior art in the embodiment of the present application, where the PFC simulated waveform is a current waveform of an AC power supply AC simulated under the condition of a fixed carrier frequency of 40 kHz; and fig. 5 is a schematic diagram of a PFC simulated waveform based on the PFC carrier frequency control device in the embodiment of the present application, where the PFC simulated waveform in fig. 5 is a current waveform of an alternating current power supply AC obtained through simulation under the condition that the real-time carrier frequency is changed between 40kHz and 150kHz, and as can be found by comparing fig. 4 and fig. 5, the ripple current in fig. 5 is much smaller than that in fig. 4 at a zero crossing, i.e., a circle, so that the PFC carrier frequency control device in the embodiment of the present application can reduce the switching loss of a power device by changing the carrier frequency in real time while ensuring reduction of the current ripple and the harmonic.
Referring to fig. 2, in some embodiments of the present application, the PFC carrier frequency control apparatus 800 may further include a control module 400, wherein the control module 400 is electrically connected to the frequency determination module 300 and the PFC circuit 100, respectively; the frequency determination module 300 is further configured to transmit the real-time carrier frequency to the control module 400; the control module 400 may be configured to control the operation of the power device of the PFC circuit according to the real-time carrier frequency.
Specifically, the control module 400 may output the PFC-PWM signal for controlling the switching time of the power device Q1, in this embodiment, the frequency determining module 300 transmits the real-time carrier frequency to the control module 400, and the control module 400 calculates the switching time of the power device Q1 based on the received real-time carrier frequency, so as to control the operation of the power device Q1.
As shown in fig. 6, fig. 6 is a schematic structural diagram of the PFC controller provided in the embodiment of the present application. On the basis of the foregoing embodiments, the present application further provides a PFC controller 600, where the PFC controller 600 may include a pulse width modulation module 601 and the PFC carrier frequency control device 800 of the first aspect, the PFC carrier frequency control device 800 is configured to output a real-time carrier frequency, and the pulse width modulation module 601 is configured to output a pulse width modulation signal and adjust the pulse width modulation signal according to the real-time carrier frequency, so as to control a power device of the PFC circuit to operate according to the adjusted pulse width modulation signal.
Specifically, please refer to fig. 6, the PFC controller 600 may further include a duty ratio determining module 603, wherein the duty ratio determining module 603 is electrically connected to the electrical parameter obtaining module 200 and the pulse width modulation module 601, and the real-time electrical signal further includes a bus voltage signal and a loop current signal of the PFC circuit;
the duty ratio determining module 603 may be configured to determine a duty ratio of the pulse width modulation signal according to the bus voltage signal, the loop current signal, and the first voltage signal, and transmit the duty ratio to the pulse width modulation module 601;
the pwm module 601 is further configured to adjust the pwm signal according to the duty cycle, so as to control the power device of the PFC circuit 100 to operate according to the adjusted pwm signal.
In this embodiment, the duty ratio determining module 603 may calculate the duty ratio of the PWM signal based on any existing PFC duty ratio calculation method, for example, calculate the duty ratio of the PWM signal according to the bus voltage signal, the loop current signal, and the first voltage signal in combination with the proportional-integral regulator.
In some embodiments of the present application, the electrical parameter obtaining module 200 may further include a bus voltage sampling unit 203, where the bus voltage sampling unit 203 is electrically connected to the output end of the PFC circuit 100 and the duty ratio determining module 603, respectively; the bus voltage sampling unit 203 may be configured to sample a bus voltage signal of the PFC circuit 100 in real time to obtain a real-time bus voltage value, and transmit the real-time bus voltage value to the duty ratio determining module 603.
As shown in fig. 3, the bus voltage sampling unit 203 may be connected to a first end of the bus capacitor C1, that is, the bus voltage signal sampled by the bus voltage sampling unit 203 is a voltage signal output to a load, and a real-time bus voltage value at each sampling time may be obtained according to the bus voltage signal.
Similarly, the electrical parameter obtaining module 200 may further include a loop current sampling unit 204, where the loop current sampling unit 204 is electrically connected to the output end of the power device of the PFC circuit 100 and the duty ratio determining module 603, respectively; the loop current sampling unit 204 may be configured to sample a loop current signal in real time to obtain a real-time loop current value, and transmit the real-time loop current value to the duty ratio determining module 603.
Since the PFC circuit shown in fig. 3 is a single-phase boost PFC circuit, the loop current sampling unit 204 may be connected to the emitter of the power device Q1, that is, the loop current signal sampled by the loop current sampling unit 204 is a current signal flowing through the emitter of the power device Q1, and a real-time loop current value at each sampling time may be obtained according to the loop current signal.
It is understood that if the PFC circuit is a multi-phase boost type PFC circuit, the loop current signal sampled by the loop current sampling unit 204 is the sum of current signals flowing through the emitters of the power devices in each phase of the PFC circuit.
The existing PFC duty cycle calculation method may be a control method based on a voltage loop and a current loop, and specifically, the duty cycle determination module 603 may compare a real-time bus voltage value with a fixed accurate voltage value to obtain a steady-state value of a static operating point, and then adjust the steady-state value based on a proportional-integral regulator to stabilize an output bus voltage at a value; the product of the real-time first voltage value obtained by sampling and the regulated bus voltage value is used as a feedback signal of the external voltage loop to supply to an internal current loop of the power device Q1, namely, the product of the real-time first voltage value and the regulated bus voltage value is combined with the real-time loop current value, so that the purpose that the current follows the voltage is achieved, and the duty ratio of the PWM signal is obtained.
As shown in fig. 7, fig. 7 is a schematic structural diagram of an air conditioner provided in the embodiment of the present application. On the basis of the foregoing embodiments, the present application further provides an air conditioner 700, where the air conditioner 700 may include an external unit controller 701, the external unit controller 701 may include the PFC circuit 100, the PFC carrier frequency control device 800 in any of the foregoing embodiments, and/or the PFC controller 600 in any of the foregoing embodiments, and the PFC carrier frequency control device 800 is configured to control a carrier frequency of the PFC circuit 100, so that the power device Q1 of the PFC circuit 100 operates based on the adjusted carrier frequency; the PFC controller 600 may control the duty ratio of the PWM signal in addition to the carrier frequency of the PFC circuit 100, so that the power device Q1 of the PFC circuit 100 operates based on the switching time obtained according to the adjusted carrier frequency and duty ratio to ensure the normal operation of the air conditioner 700.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and parts that are not described in detail in a certain embodiment may refer to the above detailed descriptions of other embodiments, and are not described herein again.
In a specific implementation, each unit or structure may be implemented as an independent entity, or may be combined arbitrarily to be implemented as one or several entities, and the specific implementation of each unit or structure may refer to the foregoing embodiments, which are not described herein again.
The PFC carrier frequency control device, the PFC controller, and the air conditioner provided in the present application are described in detail above, and specific examples are applied in the present application to explain the principles and embodiments of the present application, and the above description is only used to help understand the circuit and the core concept of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114915528A (en) * | 2022-04-22 | 2022-08-16 | 深圳清华大学研究院 | Modulation circuit and transmitter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114915528A (en) * | 2022-04-22 | 2022-08-16 | 深圳清华大学研究院 | Modulation circuit and transmitter |
| CN114915528B (en) * | 2022-04-22 | 2023-09-26 | 深圳清华大学研究院 | Modulation circuit and transmitter |
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Effective date of registration: 20220428 Address after: 528437 No. 22, Keji West Road, Torch Development Zone, Zhongshan City, Guangdong Province (residence declaration) Patentee after: Guangdong wanzhenzi Intelligent Control Technology Co.,Ltd. Address before: 528427, Zhongshan, Guangdong province Nantou town head road Patentee before: TCL AIR CONDITIONER (ZHONGSHAN) Co.,Ltd. |