CN104113199B - A kind of active PFC circuit and its control method - Google Patents
A kind of active PFC circuit and its control method Download PDFInfo
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- CN104113199B CN104113199B CN201310217459.2A CN201310217459A CN104113199B CN 104113199 B CN104113199 B CN 104113199B CN 201310217459 A CN201310217459 A CN 201310217459A CN 104113199 B CN104113199 B CN 104113199B
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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
Abstract
The invention belongs to the supply unit field of electrical equipment, more particularly to a kind of active PFC circuit and its control method.A kind of active PFC circuit and its control method provided by the invention, the single-chip microcomputer in output voltage adjustment unit can be passed through, the pressure regulation pwm signal of its output of amendment is adjusted according to the change of alternating voltage, follow the change of input voltage to the DC voltage of load so that exporting and change, it can adapt to the continually changing application scenarios of AC-input voltage, the power factor of whole electrical equipment is improved, cost is low, use flexibly, control is simple and reliability is high.
Description
Technical field
The invention belongs to the supply unit field of electrical equipment, more particularly to a kind of active PFC circuit and its control method.
Background technology
The electric equipments such as air conditioner have the rectification circuit for converting alternating voltage to DC voltage inside it, with this shape
It is supplied into dc source, then electric power in each electronic circuit.Most of these rectification circuits are condenser input type, its input current
Only near crest voltage waveform circulation and be in electric current waveform, so as to produce different degrees of harmonic wave.Harmonic wave goes out
Voltage waveform can be now caused distortion, the noise increase of entering phase electric capacity abnormal heating and motor or transformer, power receiving equipment occur
The problems such as capacity reduces.On the other hand, in alternating current circuit, the cosine of the phase difference (Φ) between voltage and electric current is called power
Factor, power factor is higher, and system is better using the efficiency of energy.In in general non-pure resistance circuit, power factor is all small
In 1, reason is due to the presence of inductance and electric capacity in circuit so that the phase difference between alternating voltage and alternating current is not equal to
Zero.
PFC（Power Factor Correction, Active PFC）Circuit can improve the utilization rate of electric energy, subtract
Power factor value can be brought up to 0.99 by pollution of the harmonic wave to power network, especially active PFC circuit caused by few electrical equipment
More than, by the active power for being greatly enhanced circuit and circuit harmonizing wave is reduced, therefore application is more and more wider.Current is active
Pfc circuit is as shown in figure 1, the voltage of the voltage conversion sampled point of its PFC chip is determined by divider resistance R1 and R2.When output electricity
When pressing constant, it is also constant that it, which samples obtained magnitude of voltage, and the pfc circuit output voltage under this structure is fixed, and is had following
Several defects and deficiency：On the one hand, it is impossible to applied to low-voltage（For example input voltage is 85V）Situation, limit its application
Scope；On the other hand, when the backfeed loop of pfc circuit occurs abnormal, it is impossible to effectively protection circuit, easily cause PFC liters
Reduce off-flavor is normal, causes whole circuit to be destroyed.
The content of the invention
It is an object of the invention to provide a kind of active PFC circuit and its control method, it is intended to solves existing active PFC electricity
The technical problem that road output voltage is fixed, boost value can not change with input voltage.
In a first aspect, active PFC circuit provided by the invention, including main power source unit, PFC units and connect with load
Filter unit, output voltage sampling unit, as an improvement, the active PFC circuit also includes：
The alternating voltage sampling unit for being connected with the main power source unit, being sampled to the alternating voltage of input；
The electric current be connected between the main power source unit and PFC units, exported to the main power source unit samples
Current sampling unit；And
It is connected between the alternating voltage sampling unit and output voltage sampling unit, is defeated according to exchanging for sampling acquisition
Enter voltage Vac and DC voltage Vdc comparison, it is corresponding regulation and export pressure regulation pwm signal to the PFC units, to defeated
Go out the output voltage adjustment unit being modified to the DC voltage of the load.
Second aspect, a kind of control method of active PFC circuit as described above include：
Step S1, the AC-input voltage Vac signals obtained are sampled according to alternating voltage sampling unit, it is straight to calculate target
Stream magnitude of voltage Vmdc simultaneously determines target DC voltage value Vmdc amendment section；
Step S2, pressure regulation pwm signal is exported, PFC units are exported to the straight of load according to the duty cycle adjustment of the pwm signal
Flow voltage；
Step S3, the DC voltage Vdc that the sampling of output voltage sampling unit obtains is obtained, judges the DC voltage Vdc
Whether in the amendment section of the target DC voltage value Vmdc：It is, then it is assumed that working properly；It is no, then further adjust defeated
The dutycycle of the pressure regulation pwm signal gone out.
A kind of active PFC circuit and its control method provided by the invention, can be by output voltage adjustment unit
Single-chip microcomputer, changing to adjust and correct the pressure regulation pwm signal of its output for input voltage is followed, can adapt to AC-input voltage
Continually changing application scenarios, the power factor of whole pfc circuit is improved, cost is low, use flexibly, control are simple and can
By property height.
Brief description of the drawings
Fig. 1 is the structure diagram of active PFC circuit in the prior art；
Fig. 2 is the structured flowchart of active PFC circuit provided in an embodiment of the present invention；
Fig. 3 is the exemplary electron component figure of active PFC circuit provided in an embodiment of the present invention；
Fig. 4 is the control method implementation process figure of active PFC circuit provided in an embodiment of the present invention；
Fig. 5 is the specific implementation flow chart of step S1 in Fig. 4；
Fig. 6 is the specific implementation flow chart of step S3 in Fig. 4.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Fig. 2 is the structured flowchart of active PFC circuit provided in an embodiment of the present invention；For convenience of description, illustrate only with
The related part of the present embodiment, as shown in the figure：
A kind of active PFC circuit, including main power source unit 100, PFC units 200 and the filter unit to connect with load
300th, output voltage sampling unit 400, as an improvement, active PFC circuit also includes：
The alternating voltage sampling unit 500 for being connected with main power source unit 100, being sampled to the alternating voltage of input；
The electric current be connected between main power source unit 100 and PFC units 200, exported to main power source unit 100 samples
Current sampling unit 600；And
It is connected between alternating voltage sampling unit 500 and output voltage sampling unit 400, is exchanged according to what sampling obtained
Input voltage Vac and DC voltage Vdc comparison, corresponding regulation and pressure regulation pwm signal is exported to PFC units 200, to defeated
Go out the output voltage adjustment unit 700 being modified to the DC voltage of load.
The active PFC circuit provided according to the present embodiment, can be according to adopting by an output voltage adjustment unit 700
AC-input voltage Vac and DC voltage Vdc that sample obtains comparison, corresponding adjust and export pressure regulation pwm signal to PFC
Unit 200 so that input voltage can be followed and change by correcting the PFC boost value of regulation, adapted to AC-input voltage and constantly changed
Application scenarios, improve the power factor of whole pfc circuit, cost is low, use flexibly, control is simple and reliability is high.
Fig. 3 is the exemplary electron component figure of active PFC circuit provided in an embodiment of the present invention；For convenience of description, only
Part related to the present embodiment is shown, as shown in the figure：
As one embodiment of the invention, main power source unit 100 includes AC power, the rectifier bridge stack BR1 to connect successively
With filter capacitor C1；Rectifier bridge stack BR1 two inputs connect the live wire L and zero line N of AC power, the exchange to input respectively
Voltage carries out rectification, and filter capacitor C1 is used to filter out circuit high frequency noise；Filter unit 300 includes electrochemical capacitor E1；Electrolysis electricity
Hold E1 to be connected between diode D1 negative electrode and ground, load RL is attempted by electrochemical capacitor E1 both ends respectively.
Alternating voltage sampling unit 500 includes resistance R5, and resistance R5 both ends connect live wire L and the output of AC power respectively
The input of voltage regulation unit 700.
As one embodiment of the invention, output voltage sampling unit 400 includes resistance R6 and resistance R7；Resistance R6 and electricity
Resistance R7 is sequentially connected in series between diode D1 negative electrode and ground, and resistance R6 and resistance R7 public connecting end sample for output voltage
The output end of unit 400.
As one embodiment of the invention, output voltage adjustment unit 700 includes single-chip microcomputer IC2 and NPN type triode Q1；
Single-chip microcomputer IC2 is connected with the output end of alternating voltage sampling unit 500, and NPN type triode Q1 base stage connects single-chip microcomputer IC2's
Pwm signal output end, NPN type triode Q1 drain electrode meet the output end of output voltage sampling unit 400, NPN type triode Q1
Source ground；Single-chip microcomputer IC2 samples the AC-input voltage Vac obtained according to output voltage sampling unit 400 and calculates mesh
Mark DC voltage value Vmdc, determine the DC voltage Vdc that it corrects section, is obtained according to target DC voltage value Vmdc with sampling
Magnitude relationship, corresponding regulation and output pwm signal, by changing the electric current in NPN type triode Q1 drain electrodes, to output to institute
The DC voltage for stating load RL is modified.In general, will cause the dutycycle of pwm signal to increase, NPN type triode Q1 leakages
The electric current increase of pole, so as to flow through the increase of resistance R6 electric current, cause DC voltage Vdc increase of the output to load, constantly adjust
It is whole, until making DC voltage Vdc fall into target DC voltage value Vmdc amendment section.
PFC units 200 include PFC chip ICs 1, inductance L1, insulated gate bipolar transistor IGBT and diode D1；Electric current
Sampling unit 600 includes resistance R1, resistance R2, resistance R3 and resistance R4；Herein, the model of PFC chip ICs 1 is unlimited, such as
The UCC2818 of TI companies can be selected.In fact, UCC28, UCC38, UC28 and UC38 of including but not limited to TI companies are serial
PFC chips be all feasible.Insulated gate bipolar transistor IGBT be then as switching device control inductance L1 energy storage with
Realize boosting；The output end of inductance L1 the first termination main power source unit 100, inductance L1 the second end connects insulated gate bipolar simultaneously
Transistor npn npn IGBT drain electrode and diode D1 anode, diode D1 negative electrode connect filter unit 300 and output voltage simultaneously
Sampling unit 400, the source ground of insulated gate bipolar transistor IGBT, the grid of insulated gate bipolar transistor IGBT connect
The driving output pin of PFC chip ICs 1, the output voltage detection pin VSENSE of PFC chip ICs 1 are connected to the Voltage loop of body simultaneously
Amplify the output end of output pin VOUT and output voltage sampling unit 400；Resistance R3 is connected to the electric current loop of PFC chip ICs 1
Between input pin CAI and ground, resistance R2 is connected between the multiplier output pin MOUT of PFC chip ICs 1 and ground, resistance R1
Both ends difference connecting resistance R2, the one end of resistance R3 away from PFC chip ICs 1, resistance R4 is connected to rectifier bridge stack BR1 output end
Between the line current sampling input pin IAC of PFC chip ICs 1.
The active PFC circuit provided according to embodiments of the present invention, there is provided active PFC circuit control method implementation process
Figure is as shown in Figure 4：
Step S1：The AC-input voltage Vac signals obtained according to the sampling of alternating voltage sampling unit, it is straight to calculate target
Stream magnitude of voltage Vmdc simultaneously determines target DC voltage value Vmdc amendment section.
In this step, output voltage adjustment unit obtains the exchange input that the sampling of alternating voltage sampling unit obtains first
Voltage Vac signals, target DC voltage value Vmdc is calculated accordingly and determines target DC voltage value Vmdc amendment section.
In specific implementation, the flow shown in Fig. 5 can be used to realize.As shown in Figure 5：
Step S11, the AC-input voltage Vac signals that the sampling of alternating voltage sampling unit obtains are obtained.
Step S12, according to default pfc circuit boosting coefficient M, by relational expression Vmdc=M*Vac, target direct current is calculated
Magnitude of voltage Vmdc.
Step S13, the amendment section for determining target DC voltage value Vmdc is [Vmdc-N, Vmdc+N], wherein, N is pre-
If voltage correction value.
In this step S1 realization, it is crucial that the boosting coefficient M of pre-set pfc circuit.From mentality of designing
On see, in the case of pfc circuit bringing onto load RL, due to load RL also to consume a part of electric energy, cause output direct current
Pressure Vdc can be reduced it is necessary to be boosted by pfc circuit.On the basis of balance PFC units power consumption in itself and power utilization rate
On, it can set boosting coefficient M=1.4, i.e. Vmdc=1.4*Vac, at this moment target DC voltage value（Namely boost value）It is close
In the peak value of alternating voltage, this is to consider the coefficient that IGBT heat conditions obtain in PFC units.Moreover according to active PFC
The specific use environment of circuit and default voltage correction value N, the amendment section for determining target DC voltage value Vmdc are
[Vmdc-N, Vmdc+N].For example, voltage correction value N can be set to 5V, control system AC power supply voltage virtual value Vac
It is 220V, if it is 220V that sampling, which obtains a Vac signal, calculating a corresponding target DC voltage value Vmdc is
320V, amendment section is 315V to 325V.
Step S2：Pressure regulation pwm signal is exported, PFC units are exported to the straight of load according to the duty cycle adjustment of the pwm signal
Flow voltage.
In the course of work of whole active PFC circuit, output voltage adjustment unit can constantly adjust output pressure regulation PWM
Signal, PFC units adjust DC voltage of the output to load RL in real time further according to the dutycycle of the pwm signal.
Step S3：The DC voltage Vdc that the sampling of output voltage sampling unit obtains is obtained, judges the DC voltage Vdc
Whether in the amendment section of the target DC voltage value Vmdc：It is, then it is assumed that working properly；It is no, then further adjust defeated
The dutycycle of the pressure regulation pwm signal gone out.
In this step, output voltage adjustment unit obtains the DC voltage Vdc that voltage sampling unit sampling obtains in real time,
Judge in the amendment section for the target DC voltage value Vmdc whether its size determines in step sl, if, then it represents that it is active
Pfc circuit is working properly；If it is not, then further adjust the dutycycle of the pressure regulation pwm signal of output.During specific implementation, Ke Yican
According to the flow shown in Fig. 6.As shown in Figure 6：
Step S31, the DC voltage Vdc that the sampling of output voltage sampling unit obtains is obtained；
Step S32, judge the DC voltage Vdc whether in the amendment section of the target DC voltage value Vmdc：
It is, then it is assumed that working properly；It is no, then into step S33；
If step S33, described DC voltage Vdc is less than（Vmdc-N）, then pressure regulation PWM letters are incrementally increased according to preparatory condition
Number dutycycle；If the DC voltage Vdc is more than（Vmdc+N）, then pressure regulation pwm signal is progressively reduced according to preparatory condition
Dutycycle.
In step S3, PFC units adjust DC voltage according to pressure regulation pwm signal, and voltage sampling unit sampling obtains
A DC voltage Vdc, judge DC voltage Vdc whether repairing in the target DC voltage value Vmdc determined by step S1
Positive section（Such as 315V-325V）In the range of.Assuming that Vdc=320V that sampling obtains, then it represents that PFC pressure regulation is normal；If direct current
Voltage Vdc is then incrementally increased according to preparatory condition not in target DC voltage value Vmdc amendment section or is reduced pressure regulation
The dutycycle of pwm signal, for example, it can be set to adjustment each time is all the dutycycle of increase or reduction 1%.If Vdc=
312V, that is, the target voltage values 315V of minimum is less than, now output voltage adjustment unit can correct PWM outputs, according to default
Condition incrementally increases the dutycycle of pressure regulation pwm signal.For example, it is all the dutycycle of increase by 1% that can set adjustment each time：
If Vdc=328V, that is, the target voltage values 325V of maximum is greater than, now output voltage adjustment unit can correct PWM outputs, press
Progressively reduce the dutycycle of pressure regulation pwm signal according to preparatory condition.For example, adjustment all accounting for for reduction 1% each time can be set
Empty ratio.Often adjust once, all continue the DC voltage Vdc that real-time sampling obtains output, continue to judge DC voltage Vdc whether
In the range of target DC voltage value Vmdc amendment section, DC voltage Vdc is finally set to reach repairing for target DC voltage value
Positive section.
Step S4：When dutycycle adjusted to the default highest rate or during minimum ratio of pressure regulation pwm signal, if
The DC voltage Vdc in the amendment section of the target DC voltage value Vmdc, does not then send pfc circuit operation irregularity yet
Pre-warning signal.
In this step, if the dutycycle of pressure regulation pwm signal adjusted to default highest rate or minimum ratio
（For example preset the at most dutyfactor value of increase or reduction 5%）When, if the DC voltage Vdc that sampling obtains is not yet in phase
In the target DC voltage value Vmdc answered amendment section, then the pre-warning signal of pfc circuit operation irregularity is sent.Increase this step
Suddenly, the security reliability of the active PFC circuit is more improved.
In summary, a kind of active PFC circuit and its control method provided by the invention, can be adjusted by output voltage
Single-chip microcomputer in unit, the pressure regulation pwm signal of its output of amendment is adjusted according to the change of alternating voltage so that export to load
DC voltage follow the change of input voltage and change, can adapt to the continually changing application scenarios of AC-input voltage, carry
The high power factor of whole electrical equipment, cost is low, use flexibly, control is simple and reliability is high.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, although with reference to foregoing reality
Apply example the present invention has been carried out relatively to be described in detail, for those skilled in the art, it still can be to foregoing each reality
The technical scheme described in example is applied to modify or carry out equivalent substitution to which part technical characteristic.It is all the present invention
All any modification, equivalent and improvement made within spirit and principle etc., should be included in the scope of the protection.
Claims (7)
1. a kind of active PFC circuit, including main power source unit, PFC units and filter unit, the output voltage to connect with load
Sampling unit, it is characterised in that the active PFC circuit also includes：
The alternating voltage sampling unit for being connected with the main power source unit, being sampled to the alternating voltage of input；
The electricity that the electric current be connected between the main power source unit and PFC units, exported to the main power source unit is sampled
Flow sampling unit；And
It is connected between the alternating voltage sampling unit and output voltage sampling unit, exchanges input electricity according to what sampling obtained
Pressure Vac and DC voltage Vdc comparison, it is corresponding adjust and export pressure regulation pwm signal to the PFC units, given to exporting
The output voltage adjustment unit that the DC voltage of the load is modified；
The output voltage adjustment unit includes single-chip microcomputer IC2 and NPN type triode Q1；The single-chip microcomputer IC2 exchanges with described
The output end of voltage sampling unit is connected, and the base stage of the NPN type triode Q1 connects the pwm signal output of the single-chip microcomputer IC2
End, the drain electrode of the NPN type triode Q1 connect the output end of the output voltage sampling unit, the NPN type triode Q1's
Source ground；
The AC-input voltage Vac that the single-chip microcomputer IC2 is obtained by sampling calculates target DC voltage value Vmdc amendment area
Between, magnitude relationship, corresponding regulation and output according to the target DC voltage value Vmdc to the DC voltage Vdc of sampling acquisition
Pwm signal, carried out by changing the electric current in the NPN type triode Q1 drain electrodes, to the DC voltage exported to the load
Amendment, until the DC voltage Vdc is fallen into the amendment section of the target DC voltage value Vmdc；
Specifically, the single-chip microcomputer IC2, by relational expression Vmdc=M*Vac, calculates according to default pfc circuit boosting coefficient M
The target DC voltage value Vmdc, and determine that the amendment section of the target DC voltage value Vmdc is [Vmdc-N, Vmdc+
N], wherein, N is default voltage correction value；The single-chip microcomputer IC2 judges whether the DC voltage Vdc is straight in the target
In the amendment section for flowing magnitude of voltage Vmdc, if the DC voltage Vdc is less than (Vmdc-N), incrementally increased according to preparatory condition
The dutycycle of the pressure regulation pwm signal, if the DC voltage Vdc is more than (Vmdc+N), progressively reduce according to preparatory condition
The dutycycle of the pressure regulation pwm signal.
2. active PFC circuit as claimed in claim 1, it is characterised in that：
The main power source unit includes AC power, rectifier bridge stack BR1 and the filter capacitor C1 to connect successively；The rectifier bridge stack
BR1 carries out rectification to alternating voltage, and the filter capacitor C1 filters out circuit high frequency noise；
The both ends that the alternating voltage sampling unit includes resistance R5, the resistance R5 meet the live wire L of the AC power respectively
With the input of the output voltage adjustment unit.
3. active PFC circuit as claimed in claim 2, it is characterised in that：The PFC units include PFC chip ICs 1, inductance
L1, insulated gate bipolar transistor IGBT and diode D1；The current sampling unit includes resistance R1, resistance R2, resistance R3
With resistance R4；
The output end of the first termination main power source unit of the inductance L1, the second end of the inductance L1 connect simultaneously it is described absolutely
The drain electrode of edge grid bipolar transistor IGBT and the anode of the diode D1, the negative electrode of the diode D1 connect the filter simultaneously
Ripple unit and the output voltage sampling unit, the source ground of the insulated gate bipolar transistor IGBT, the insulated gate
The grid of bipolar transistor IGBT connects the driving output pin of the PFC chip ICs 1, the output voltage of the PFC chip ICs 1
Detection pin is connected to the Voltage loop amplification output pin of body and the output end of the output voltage sampling unit simultaneously；
The resistance R3 is connected between the electric current loop input pin and ground of the PFC chip ICs 1, and the resistance R2 is connected to institute
State between the multiplier output pin of PFC chip ICs 1 and ground, the both ends of the resistance R1 connect the resistance R2, the electricity respectively
The one end of R3 away from the PFC chip ICs 1 is hindered, the resistance R4 is connected to the output end of the rectifier bridge stack BR1 and the PFC
Between the line current sampling input pin of chip IC 1.
4. active PFC circuit as claimed in claim 3, it is characterised in that：The output voltage sampling unit includes resistance R6
With resistance R7；
The resistance R6 and resistance R7 are sequentially connected in series between the negative electrode and ground of the diode D1, the resistance R6 and resistance R7
Public connecting end be the output voltage sampling unit output end.
5. active PFC circuit as claimed in claim 4, it is characterised in that：The filter unit includes electrochemical capacitor E1；
The electrochemical capacitor E1 is connected between the negative electrode and ground of the diode D1, and the load is attempted by the electrolysis respectively
Electric capacity E1 both ends.
A kind of 6. control method of active PFC circuit as described in claim any one of 1-5, it is characterised in that methods described
Including：
Step S1, the AC-input voltage Vac signals obtained are sampled according to alternating voltage sampling unit, calculate target direct current
Pressure value Vmdc and the amendment section for determining target DC voltage value Vmdc；
Step S2, pressure regulation pwm signal is exported, PFC units export the direct current to load according to the duty cycle adjustment of the pwm signal
Pressure；
Step S3, the DC voltage Vdc that the sampling of output voltage sampling unit obtains is obtained, whether judges the DC voltage Vdc
In the amendment section of the target DC voltage value Vmdc：It is, then it is assumed that working properly；It is no, then further adjust output
The dutycycle of pressure regulation pwm signal；
The step S1 is specially：
Step S11, the AC-input voltage Vac signals that the sampling of alternating voltage sampling unit obtains are obtained；
Step S12, according to default pfc circuit boosting coefficient M, by relational expression Vmdc=M*Vac, target DC voltage is calculated
Value Vmdc；
Step S13, the amendment section for determining target DC voltage value Vmdc is [Vmdc-N, Vmdc+N], wherein, N is default
Voltage correction value；
The step S3 is specially：
Step S31, the DC voltage Vdc that the sampling of output voltage sampling unit obtains is obtained；
Step S32, judge the DC voltage Vdc whether in the amendment section of the target DC voltage value Vmdc：It is, then
Think working properly；It is no, then into step S33；
If step S33, described DC voltage Vdc is less than (Vmdc-N), pressure regulation pwm signal is incrementally increased according to preparatory condition
Dutycycle；If the DC voltage Vdc is more than (Vmdc+N), progressively reduce the duty of pressure regulation pwm signal according to preparatory condition
Than.
7. the control method of active PFC circuit as claimed in claim 6, it is characterised in that also include after the step S33：
Step S4, when dutycycle adjusted to the default highest rate or during minimum ratio of pressure regulation pwm signal, if described
DC voltage Vdc in the amendment section of the target DC voltage value Vmdc, does not then send the pre- of pfc circuit operation irregularity yet
Alert signal.
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| CN105656303A (en) * | 2016-04-07 | 2016-06-08 | 湖州积微电子科技有限公司 | Driving system of treadmill |
| CN107368137B (en) * | 2016-12-19 | 2020-03-17 | 山东金洲科瑞节能科技有限公司 | AC power supply quality adjusting device |
| CN110739834B (en) * | 2019-10-10 | 2020-11-24 | 珠海格力节能环保制冷技术研究中心有限公司 | Bus voltage harmonic suppression method and device, storage medium and motor |
| CN111554235A (en) * | 2020-05-28 | 2020-08-18 | 广东美的厨房电器制造有限公司 | Boost circuit, display device and household appliance |
| CN112524853B (en) * | 2020-12-09 | 2023-06-23 | 青岛海尔空调器有限总公司 | Control method of compressor in variable frequency air conditioner and variable frequency air conditioner |
| CN112798997B (en) * | 2020-12-30 | 2022-09-06 | 四川长虹空调有限公司 | Frequency converter direct-current voltage detection and correction method |
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| CN101777828A (en) * | 2010-02-23 | 2010-07-14 | 广东美的电器股份有限公司 | Control device with compensatory active PFC (power factor correction) and control method thereof |
| CN203301359U (en) * | 2013-06-03 | 2013-11-20 | 广东美的制冷设备有限公司 | Active PFC circuit |
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