CN104953814A - Method and device for controlling PFC (power factor correction) circuit - Google Patents
Method and device for controlling PFC (power factor correction) circuit Download PDFInfo
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- CN104953814A CN104953814A CN201510369018.3A CN201510369018A CN104953814A CN 104953814 A CN104953814 A CN 104953814A CN 201510369018 A CN201510369018 A CN 201510369018A CN 104953814 A CN104953814 A CN 104953814A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
An embodiment of the invention discloses a method and a device for controlling a PFC (power factor correction) circuit, relates to the technical field of control, and aims to solve the problem of electricity waste caused by the fact that steady-state output voltage of PFC circuits is constant and loads are smaller in the prior art. The method comprises steps as follows: in each carrier frequency cycle, determining target steady-state output voltage of the PFC circuit according to the magnitude of a load of the PFC circuit; acquiring actual output voltage of the PFC circuit; determining the duty ratio of carrier frequency PWM (pulse-width modulation) of the PFC circuit according to the target steady-state output voltage and the actual output voltage; adjusting the PFC circuit according to the duty ratio to enable the actual output voltage of the adjusted PFC circuit to approach the target steady-state output voltage.
Description
Technical field
The present invention relates to control technology field, particularly relate to a kind of method and apparatus of control PFC (Power Factor Correction, power factor correction) circuit.
Background technology
PFC technology can solve the problem of the current harmonics existed in power electronic equipment effectively, thus improves the utilance of electric energy.OCC (One Cycle Control, one circle control) algorithm, as a kind of method controlling pfc circuit, has and realizes the advantages such as simple.But current one circle control algorithm is all constant based on the steady state output voltage of pfc circuit and arrange, like this, in order to meet load maximum time required output voltage, usually the steady state output voltage of pfc circuit is higher; Like this, when load is less, the waste of electricity can be caused.
Summary of the invention
Embodiments of the invention provide a kind of method and apparatus controlling pfc circuit, constant in order to solve the steady state output voltage because of pfc circuit of the prior art, and the problem of the electricity waste caused when load is less.
For achieving the above object, embodiments of the invention adopt following technical scheme:
First aspect, provides a kind of method controlling power factor correction pfc circuit, comprising:
In each radio-cycle, determine the target steady state output voltage of described pfc circuit according to the size of the load of described pfc circuit;
Gather the actual output voltage of described pfc circuit;
The duty ratio of the carrier frequency pulse width modulated PWM of described pfc circuit is determined according to described target steady state output voltage and described actual output voltage;
Pfc circuit according to described duty cycle adjustment, levels off to described target steady state output voltage to make the actual output voltage of described pfc circuit after regulating.
Second aspect, provides a kind of device controlling power factor correction pfc circuit, comprising:
First determining unit, in each radio-cycle, determines the target steady state output voltage of described pfc circuit according to the size of the load of described pfc circuit;
Collecting unit, for gathering the actual output voltage of described pfc circuit;
Second determining unit, for determining the duty ratio of the carrier frequency pulse width modulated PWM of described pfc circuit according to described target steady state output voltage and described actual output voltage;
Regulon, for pfc circuit according to described duty cycle adjustment, levels off to described target steady state output voltage to make the actual output voltage of described pfc circuit after regulating.
In technique scheme, first, in each radio-cycle, according to the target steady state output voltage of the size determination pfc circuit of the load of pfc circuit; Secondly, the actual output voltage of pfc circuit is gathered; Then, according to the duty ratio of target steady state output voltage with the carrier frequency PWM of this actual output voltage determination pfc circuit; Finally, according to this duty cycle adjustment pfc circuit, level off to target steady state output voltage to make the actual output voltage of pfc circuit after regulating.Because this technical scheme is in the process of target steady state output voltage determining pfc circuit, combine the size of the load of pfc circuit, therefore, the different target steady state output voltage that different loads is corresponding can be realized, with of the prior art " use meet load maximum time required output voltage as steady state output voltage " technical scheme compared with, when load is less, electricity can be saved.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The topological structure schematic diagram of a kind of Boost pfc circuit that Fig. 1 provides for the embodiment of the present invention;
A kind of schematic flow sheet controlling the method for pfc circuit that Fig. 2 provides for the embodiment of the present invention;
The schematic flow sheet of the method for the another kind control pfc circuit that Fig. 3 provides for the embodiment of the present invention;
A kind of structural representation controlling the device of pfc circuit that Fig. 4 provides for the embodiment of the present invention;
The structural representation of the device of the another kind control pfc circuit that Fig. 5 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The conveniently understanding of those skilled in the art, first introduce following content:
The technical scheme that the embodiment of the present invention provides is applicable to comprise in the scene of the variable pfc circuit of load, such as, is applicable in transducer air conditioning.Wherein, pfc circuit is specifically as follows any one pfc circuit, such as, and Boost (booster type) pfc circuit, Buck (voltage-dropping type) pfc circuit etc.; And for example, Single switch pfc circuit, biswitch pfc circuit etc.Wherein, being that Boost pfc circuit is described for example with pfc circuit in concrete example herein, as shown in Figure 1, is a kind of topological diagram of Boost pfc circuit.
The object controlling pfc circuit is: make the input current of pfc circuit consistent with the phase place of the input voltage of pfc circuit; Such as, based on the pfc circuit shown in Fig. 1, be specially: make i
lwith U
inphase place consistent.Wherein, in the process realizing this object, a key point is: make the amplitude of the actual output voltage of pfc circuit equal the amplitude of default steady state output voltage.The technical scheme that the embodiment of the present invention provides is specially to be improved " amplitude how realizing the actual output voltage of pfc circuit equals the amplitude of default steady state output voltage ".
"and/or" is herein only a kind of incidence relation describing affiliated partner, and expression can exist three kinds of relations, and such as, A and/or B, can represent: individualism A, exists A and B simultaneously, these three kinds of situations of individualism B." multiple " refer to two or more.
The technical scheme that theres is provided of the exemplary illustration embodiment of the present invention below:
Embodiment one
See Fig. 2, be a kind of schematic flow sheet controlling the method for pfc circuit that the embodiment of the present invention provides, the method shown in Fig. 2 comprises the following steps S201-S204:
S201: in each radio-cycle, according to the target steady state output voltage of the size determination pfc circuit of the load of pfc circuit.
For example, when the method is applied in transducer air conditioning, can according to the load of the present operating frequency determination pfc circuit of transducer air conditioning, concrete grammar can with reference to prior art.The frequency that " radio-cycle " is corresponding is generally tens kHz (KHz).
During specific implementation, the corresponding relation between the different value of the load of pfc circuit and steady state output voltage can be pre-set, like this, in each radio-cycle, can directly according to the corresponding relation determination target steady state output voltage between the different loads pre-set and steady state output voltage.
S202: the actual output voltage gathering pfc circuit.
The concrete methods of realizing of this step S202 can with reference to prior art.
S203: according to the duty ratio of target steady state output voltage with the carrier frequency PWM (Pulse-Width Modulation, pulse width modulation) of this actual output voltage determination pfc circuit.
For example, " carrier frequency PWM " i.e. carrier frequency pwm signal.The specific implementation of this step S203 can with reference to hereafter.Certainly, any one method of the prior art also can be used during specific implementation to realize, repeat no more herein.
S204: according to this duty cycle adjustment pfc circuit, levels off to target steady state output voltage to make the actual output voltage of pfc circuit after regulating.
For example, according to the turn-on and turn-off of the switch in this Duty ratio control pfc circuit, thus regulate the amplitude of the input current of pfc circuit, and then the amplitude of the actual output voltage of adjustment pfc circuit; Such as, based on the pfc circuit shown in Fig. 1, be specially: according to the turn-on and turn-off of this Duty ratio control switch S, thus regulate i
lamplitude, and then regulate the amplitude of Uo.
It should be noted that, if after execution step S204, the amplitude of the actual output voltage of pfc circuit is not equal to the amplitude of target steady state voltage, then circulation performs above-mentioned steps S201-S204, until the amplitude of the actual output voltage of pfc circuit equals the amplitude of target steady state voltage, namely achieve the stable of pfc circuit.
It should be noted that in addition, the method is based on one circle control algorithm, concrete, in each radio-cycle, all perform step S201-S204.Because the method for the pfc circuit in the control air conditioner that provides in prior art is generally: the actual output voltage gathering pfc circuit in a period of time, and regulate pfc circuit according to this actual output voltage, thus the actual output voltage of pfc circuit after regulating is made to level off to target steady state output voltage; Wherein, this time period is generally greater than or much larger than a radio-cycle.Therefore, compared to existing technology, when the method is applied in air conditioner, the actual output voltage that can realize pfc circuit fast levels off to target steady state output voltage.
The method of the control pfc circuit that the embodiment of the present invention provides, first, in each radio-cycle, according to the target steady state output voltage of the size determination pfc circuit of the load of pfc circuit; Secondly, the actual output voltage of pfc circuit is gathered; Then, according to the duty ratio of target steady state output voltage with the carrier frequency PWM of this actual output voltage determination pfc circuit; Finally, according to this duty cycle adjustment pfc circuit, level off to target steady state output voltage to make the actual output voltage of pfc circuit after regulating.Because this technical scheme is in the process of target steady state output voltage determining pfc circuit, combine the size of the load of pfc circuit, therefore, the different target steady state output voltage that different loads is corresponding can be realized, with of the prior art " use meet load maximum time required output voltage as steady state output voltage " technical scheme compared with, when load is less, electricity can be saved.
In the optional implementation of one, be divided into by the numerical value between the minimum value of load and maximum several interval, each interval is a loading range; The corresponding steady state output voltage of each loading range.Wherein, the division rule of loading range can for dividing equally, also can, for divide according to the distribution of the value of load, can also be other rules certainly.The steady state output voltage that each loading range is corresponding can wait factor to determine based on experience value.Based on this, step S202 can comprise: determine the targeted loads scope belonging to this load according to the size of this load; According to the corresponding relation between loading range and steady state output voltage, determine the steady state output voltage that targeted loads scope is corresponding, as target steady state output voltage.
Further alternative, when the variation tendency of the size of load is ascending, the targeted loads scope belonging to load is: [r
k-1, r
k], wherein, 0 < r
k-1< r
k; And/or, when the variation tendency of the size of load be by greatly to hour, the targeted loads scope belonging to load is: [r
k-1-△ c, r
k-△ c], wherein, 0≤△ c < r
k-1< r
k.K be more than or equal to 1 integer.
For example, usually, pfc circuit is in the process started, and the variation tendency of the size of its load is for changing from small to big; In the process run, its load can change according to factors such as the changes of the instruction of user or external environment ascending or descendingly; In the process of closing, the variation tendency of the size of its load is from large to small.Be in process from large to small in the variation tendency of the size of load, when the size of load changes at the separation place of loading range, target burning voltage can frequently change, in this situation, the change number of times that certain control return difference △ c can reduce target burning voltage is set, thus reduces device loss.
It should be noted that, in this further alternative implementation, determine target steady state voltage within the current carrier frequency cycle before, the method can also comprise: determine that the size of the one or more radio-cycle internal burdens before the current carrier frequency cycle is relevant, to determine the variation tendency of the size of load.
In the optional implementation of one, above-mentioned steps S103 can comprise the following steps 1)-3):
1) digital quantity corresponding to actual output voltage is obtained, and the difference between digital quantity and target steady state output voltage.For example, usually, actual output voltage is analog quantity, needs first to be converted into digital quantity, could compare with target steady state output voltage.
2) according to this difference determination Nonlinear Adjustment coefficient.
3) according to Nonlinear Adjustment coefficient, the duty ratio of the carrier frequency PWM of pfc circuit is determined.
Exemplary, step 2) can realize in the following manner: when this difference is less than or equal to predetermined threshold value, adopt PID regulative mode determination Nonlinear Adjustment coefficient; When this difference is greater than predetermined threshold value, adopt direct regulative mode determination Nonlinear Adjustment coefficient.
It should be noted that, PID regulative mode can realize fine adjustment, and direct regulative mode can realize quick adjustment.In addition, during specific implementation, step 2) also can directly be realized by PID regulative mode or target gain mode.The embodiment of the present invention does not limit the concrete value of " predetermined threshold value " and its value mode; Such as, predetermined threshold value can be 20V, can also be other values certainly.
Embodiment two
See Fig. 3, be a kind of schematic flow sheet controlling the method for pfc circuit that the embodiment of the present invention provides, the method shown in Fig. 3 comprises the following steps S301-S310:
S301: in each radio-cycle, determines the size of the load of pfc circuit and the variation tendency of this load.
S302: according to this load with the variation tendency of this load of size, determine the targeted loads scope belonging to this load.
For example, when the variation tendency of the size of load is ascending, the targeted loads scope belonging to load is: [r
k-1, r
k], wherein, 0 < r
k-1< r
k; When the variation tendency of the size of load be by greatly to hour, the targeted loads scope belonging to load is: [r
k-1-△ c, r
k-△ c], wherein, 0≤△ c < r
k-1< r
k.Wherein, k be more than or equal to 1 integer.
S303: according to the corresponding relation between loading range and steady state output voltage, determines the steady state output voltage that targeted loads scope is corresponding, as target steady state output voltage.
For example, when the variation tendency of the size of load is different, the corresponding relation between loading range and steady state output voltage can be as shown in table 1:
Table 1
S304: the actual output voltage gathering pfc circuit.
S305: obtain the digital quantity that actual output voltage is corresponding, and the difference between this digital quantity and target steady state output voltage.
S306: judge whether this difference is less than or equal to predetermined threshold value.
If so, then step S307 is performed; If not, then step S308 is performed.
S307: adopt PID regulative mode determination Nonlinear Adjustment coefficient according to this difference.
After performing S307, perform S309.
S308: adopt direct regulative mode determination Nonlinear Adjustment coefficient according to this difference.
For example, go out target according to this mathematic interpolation and regulate gain, directly regulate gain determination Nonlinear Adjustment coefficient according to this target.
S309: according to Nonlinear Adjustment coefficient, determines the duty ratio of the carrier frequency PWM of pfc circuit.
S310: according to this duty cycle adjustment pfc circuit, levels off to target steady state output voltage to make the actual output voltage of pfc circuit after regulating.
Wherein, the concrete methods of realizing of step S309-S310 can with reference to prior art.
Be applied in transducer air conditioning in this way and be illustrated: after transducer air conditioning brings into operation, the initial output steady state voltage of pfc circuit is U
0.In pfc circuit modulated process, the load of pfc circuit is changed from small to big, when the loading range belonging to load is [r
0, r
1) time, obtain duty ratio by said method, thus according to this duty cycle adjustment pfc circuit, until the actual output voltage of pfc circuit reaches U
1; By that analogy, when the loading range belonging to load is [r
k-1, r
k) time, obtain duty ratio by said method, thus according to this duty cycle adjustment pfc circuit, until the actual output voltage of pfc circuit reaches U
k.Pfc circuit load from large to small time, when the loading range belonging to load is [r
k-1-△ c, r
k-△ c) time, obtain duty ratio by said method, thus according to this duty cycle adjustment pfc circuit, until the actual output voltage of pfc circuit reaches U
k; By that analogy.
Embodiment three
See Fig. 4, it is a kind of structural representation controlling the device of pfc circuit that the embodiment of the present invention provides.In the present embodiment, the explanation of related content can with reference to said method embodiment.Device 4 shown in Fig. 4 is in order to perform the method for control pfc circuit provided above.This device 4 can comprise: the first determining unit 41, collecting unit 42, second determining unit 43, regulon 44.
First determining unit 41, in each radio-cycle, according to the target steady state output voltage of the size determination pfc circuit of the load of pfc circuit.
Collecting unit 42, for gathering the actual output voltage of pfc circuit.
Second determining unit 43, for the duty ratio of the carrier frequency PWM according to target steady state output voltage and this actual output voltage determination pfc circuit.
Regulon 44, for according to this duty cycle adjustment pfc circuit, levels off to target steady state output voltage to make the actual output voltage of the pfc circuit after regulating.
In the optional implementation of one, the first determining unit 41 specifically for: determine the targeted loads scope belonging to this load according to the size of this load; According to the corresponding relation between loading range and steady state output voltage, determine the steady state output voltage that targeted loads scope is corresponding, as the target steady state output voltage of pfc circuit.
Further alternative, when the variation tendency of the size of this load is ascending, the targeted loads scope belonging to this load is: [r
k-1, r
k], wherein, 0 < r
k-1< r
k; And/or, when the variation tendency of the size of this load be by greatly to hour, the targeted loads scope belonging to this load is: [r
k-1-△ c, r
k-△ c], wherein, 0≤△ c < r
k-1< r
k.
In another optional implementation, the second determining unit 43 specifically for: obtain the digital quantity that this actual output voltage is corresponding, and the difference between this digital quantity and target steady state output voltage; According to this difference determination Nonlinear Adjustment coefficient; According to this Nonlinear Adjustment coefficient, determine the duty ratio of the carrier frequency PWM of pfc circuit.
Further alternative, the second determining unit 43 when according to this difference determination Nonlinear Adjustment coefficient, specifically for: when this difference is less than or equal to predetermined threshold value, adopt PID regulative mode determination Nonlinear Adjustment coefficient according to this difference; When this difference is greater than predetermined threshold value, adopt direct regulative mode determination Nonlinear Adjustment coefficient according to this difference.
The device of the control pfc circuit that the embodiment of the present invention provides, first, in each radio-cycle, according to the target steady state output voltage of the size determination pfc circuit of the load of pfc circuit; Secondly, the actual output voltage of pfc circuit is gathered; Then, according to the duty ratio of target steady state output voltage with the carrier frequency PWM of this actual output voltage determination pfc circuit; Finally, according to this duty cycle adjustment pfc circuit, level off to target steady state output voltage to make the actual output voltage of pfc circuit after regulating.Because this technical scheme is in the process of target steady state output voltage determining pfc circuit, combine the size of the load of pfc circuit, therefore, the different target steady state output voltage that different loads is corresponding can be realized, with of the prior art " use meet load maximum time required output voltage as steady state output voltage " technical scheme compared with, when load is less, electricity can be saved.
Embodiment four
On hardware implementing, the first determining unit 41 in above-described embodiment three, collecting unit 42, second determining unit 43, regulon 44, can to be embedded in the form of hardware or independent of in device 4, also can be stored in a software form in the memory of device 4, so that processor calls perform operation corresponding to above modules, this processor can be CPU (CPU), microprocessor, single-chip microcomputer etc.
See Fig. 5, it is a kind of structural representation controlling the device of pfc circuit that the embodiment of the present invention provides.In the present embodiment, the explanation of related content can with reference to said method embodiment.Device 5 shown in Fig. 5 is in order to perform the method for control pfc circuit provided above.Device 5 is specifically as follows the chip of the method for performing control pfc circuit provided above, can certainly be other entity devices.Device 5 can comprise: memory 51 and processor 52.
Memory 51 is for storing one group of code, and this code is used for control processor 52 and performs following action: in each radio-cycle, according to the target steady state output voltage of the size determination pfc circuit of the load of pfc circuit; Gather the actual output voltage of pfc circuit; According to the duty ratio of target steady state output voltage with the carrier frequency PWM of this actual output voltage determination pfc circuit; According to this duty cycle adjustment pfc circuit, level off to target steady state output voltage to make the actual output voltage of pfc circuit after regulating.
In the optional implementation of one, processor 52 when performing target steady state output voltage according to the size determination pfc circuit of the load of pfc circuit, specifically for: determine the targeted loads scope belonging to this load according to the size of this load; According to the corresponding relation between loading range and steady state output voltage, determine the steady state output voltage that targeted loads scope is corresponding, as the target steady state output voltage of pfc circuit.
Further alternative, when the variation tendency of the size of this load is ascending, the targeted loads scope belonging to this load is: [r
k-1, r
k], wherein, 0 < r
k-1< r
k; And/or, when the variation tendency of the size of this load be by greatly to hour, the targeted loads scope belonging to this load is: [r
k-1-△ c, r
k-△ c], wherein, 0≤△ c < r
k-1< r
k.
In another optional implementation, processor 52 is when performing the duty ratio according to the carrier frequency PWM of target steady state output voltage and this actual output voltage determination pfc circuit, specifically for: obtain the digital quantity that this actual output voltage is corresponding, and the difference between this digital quantity and target steady state output voltage; According to this difference determination Nonlinear Adjustment coefficient; According to this Nonlinear Adjustment coefficient, determine the duty ratio of the carrier frequency PWM of pfc circuit.
Further alternative, processor 52 when performing according to this difference determination Nonlinear Adjustment coefficient, specifically for: when this difference is less than or equal to predetermined threshold value, adopt PID regulative mode determination Nonlinear Adjustment coefficient according to this difference; When this difference is greater than predetermined threshold value, adopt direct regulative mode determination Nonlinear Adjustment coefficient according to this difference.
The device of the control pfc circuit that the embodiment of the present invention provides, first, in each radio-cycle, according to the target steady state output voltage of the size determination pfc circuit of the load of pfc circuit; Secondly, the actual output voltage of pfc circuit is gathered; Then, according to the duty ratio of target steady state output voltage with the carrier frequency PWM of this actual output voltage determination pfc circuit; Finally, according to this duty cycle adjustment pfc circuit, level off to target steady state output voltage to make the actual output voltage of pfc circuit after regulating.Because this technical scheme is in the process of target steady state output voltage determining pfc circuit, combine the size of the load of pfc circuit, therefore, the different target steady state output voltage that different loads is corresponding can be realized, with of the prior art " use meet load maximum time required output voltage as steady state output voltage " technical scheme compared with, when load is less, electricity can be saved.
Last it is noted that above embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. control a method for power factor correction pfc circuit, it is characterized in that, comprising:
In each radio-cycle, determine the target steady state output voltage of described pfc circuit according to the size of the load of described pfc circuit;
Gather the actual output voltage of described pfc circuit;
The duty ratio of the carrier frequency pulse width modulated PWM of described pfc circuit is determined according to described target steady state output voltage and described actual output voltage;
Pfc circuit according to described duty cycle adjustment, levels off to described target steady state output voltage to make the actual output voltage of described pfc circuit after regulating.
2. method according to claim 1, is characterized in that, the described size according to described load determines the target steady state output voltage of described pfc circuit, comprising:
The targeted loads scope belonging to described load is determined according to the size of described load;
According to the corresponding relation between loading range and steady state output voltage, determine the steady state output voltage that described targeted loads scope is corresponding, as the target steady state output voltage of described pfc circuit.
3. method according to claim 2, is characterized in that,
When the variation tendency of the size of described load is ascending, the targeted loads scope belonging to described load is: [r
k-1, r
k], wherein, 0 < r
k-1< r
k; And/or,
When the variation tendency of the size of described load be by greatly to hour, the targeted loads scope belonging to described load is: [r
k-1-△ c, r
k-△ c], wherein, 0≤△ c < r
k-1< r
k.
4. method according to claim 1, is characterized in that, the described duty ratio determining the carrier frequency PWM of described pfc circuit according to described target steady state output voltage and described actual output voltage, comprising:
Obtain the digital quantity that described actual output voltage is corresponding, and the difference between described digital quantity and described target steady state output voltage;
According to residing difference determination Nonlinear Adjustment coefficient;
According to described Nonlinear Adjustment coefficient, determine the duty ratio of the carrier frequency PWM of described pfc circuit.
5. method according to claim 4, is characterized in that, difference determination Nonlinear Adjustment coefficient residing for described basis, comprising:
When described difference is less than or equal to predetermined threshold value, according to described difference and adoption rate integral differential PID regulative mode determination Nonlinear Adjustment coefficient;
When described difference is greater than predetermined threshold value, adopt direct regulative mode determination Nonlinear Adjustment coefficient according to described difference.
6. control a device for power factor correction pfc circuit, it is characterized in that, comprising:
First determining unit, in each radio-cycle, determines the target steady state output voltage of described pfc circuit according to the size of the load of described pfc circuit;
Collecting unit, for gathering the actual output voltage of described pfc circuit;
Second determining unit, for determining the duty ratio of the carrier frequency pulse width modulated PWM of described pfc circuit according to described target steady state output voltage and described actual output voltage;
Regulon, for pfc circuit according to described duty cycle adjustment, levels off to described target steady state output voltage to make the actual output voltage of described pfc circuit after regulating.
7. device according to claim 6, is characterized in that, described first determining unit specifically for:
The targeted loads scope belonging to described load is determined according to the size of described load;
According to the corresponding relation between loading range and steady state output voltage, determine the steady state output voltage that described targeted loads scope is corresponding, as the target steady state output voltage of described pfc circuit.
8. device according to claim 7, is characterized in that,
When the variation tendency of the size of described load is ascending, the targeted loads scope belonging to described load is: [r
k-1, r
k], wherein, 0 < r
k-1< r
k; And/or,
When the variation tendency of the size of described load be by greatly to hour, the targeted loads scope belonging to described load is: [r
k-1-△ c, r
k-△ c], wherein, 0≤△ c < r
k-1< r
k.
9. device according to claim 6, is characterized in that, described second determining unit specifically for:
Obtain the digital quantity that described actual output voltage is corresponding, and the difference between described digital quantity and described target steady state output voltage;
According to residing difference determination Nonlinear Adjustment coefficient;
According to described Nonlinear Adjustment coefficient, determine the duty ratio of the carrier frequency PWM of described pfc circuit.
10. device according to claim 9, is characterized in that, described second determining unit when according to residing difference determination Nonlinear Adjustment coefficient, specifically for:
When described difference is less than or equal to predetermined threshold value, according to described difference and adoption rate integral differential PID regulative mode determination Nonlinear Adjustment coefficient;
When described difference is greater than predetermined threshold value, adopt direct regulative mode determination Nonlinear Adjustment coefficient according to described difference.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN111082676A (en) * | 2019-12-30 | 2020-04-28 | 杭州士兰微电子股份有限公司 | Switching power supply and control circuit and control method thereof |
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| CN111162685A (en) * | 2020-01-17 | 2020-05-15 | 深圳市东力科创技术有限公司 | Control method and system of single-phase photovoltaic water pump inverter with BOOST boosting function |
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| CN113432253A (en) * | 2021-06-10 | 2021-09-24 | Tcl空调器(中山)有限公司 | Method and device for adjusting carrier frequency of circuit board, air conditioner and storage medium |
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| CN111082677A (en) * | 2019-12-30 | 2020-04-28 | 杭州士兰微电子股份有限公司 | Switching power supply and control circuit and control method thereof |
| CN111082676A (en) * | 2019-12-30 | 2020-04-28 | 杭州士兰微电子股份有限公司 | Switching power supply and control circuit and control method thereof |
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| CN111082676B (en) * | 2019-12-30 | 2021-04-23 | 杭州士兰微电子股份有限公司 | Switching power supply and control circuit and control method thereof |
| CN111082677B (en) * | 2019-12-30 | 2022-03-15 | 杭州士兰微电子股份有限公司 | Switching power supply and control circuit and control method thereof |
| CN111162685A (en) * | 2020-01-17 | 2020-05-15 | 深圳市东力科创技术有限公司 | Control method and system of single-phase photovoltaic water pump inverter with BOOST boosting function |
| CN111162685B (en) * | 2020-01-17 | 2020-09-29 | 深圳市东力科创技术有限公司 | Control method and system of single-phase photovoltaic water pump inverter with BOOST boosting function |
| CN113432253A (en) * | 2021-06-10 | 2021-09-24 | Tcl空调器(中山)有限公司 | Method and device for adjusting carrier frequency of circuit board, air conditioner and storage medium |
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