CN104113199A - Active PFC circuit and control method thereof - Google Patents
Active PFC circuit and control method thereof Download PDFInfo
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- CN104113199A CN104113199A CN201310217459.2A CN201310217459A CN104113199A CN 104113199 A CN104113199 A CN 104113199A CN 201310217459 A CN201310217459 A CN 201310217459A CN 104113199 A CN104113199 A CN 104113199A
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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
The invention belongs to the field of power supply devices of electric appliances, and particularly relates to an active PFC circuit and a control method thereof. According to the active PFC circuit and the control method thereof, a voltage-regulating PWM signal outputted by an output voltage regulating unit can be regulated and corrected via a single-chip microcomputer in the output voltage regulating unit according to change of AC voltage so that DC voltage outputted to a load is enabled to change along with change of input voltage, and an application occasion that AC input voltage constantly changes can be adapted. Therefore, power factor of the overall electric appliance is enhanced, cost is low, application is flexible, control is simple and reliability is high.
Description
Technical field
The supply unit field that the invention belongs to electrical equipment, relates in particular to a kind of active PFC circuit and control method thereof.
Background technology
The electric equipments such as air conditioner within it portion all handlebar alternating voltage convert the rectification circuit of direct voltage to, with this, form DC power supply, then electric power be fed in each electronic circuit.These rectification circuit great majority are condenser input type, and its input current only circulates and is pulse type current waveform near crest voltage waveform, thereby produces harmonic wave in various degree.The appearance of harmonic wave can cause voltage waveform to occur distortion, enter the noise increase of phase electric capacity abnormal heating and motor or transformer, the problems such as volume lowering of power receiving equipment.On the other hand, in alternating current circuit, the cosine of the phase difference between voltage and electric current (Φ) is called power factor, and power factor is higher, and system utilizes the efficiency of energy better.In general non-pure resistance circuit, power factor is all less than 1, and reason is the existence due to inductance in circuit and electric capacity, makes the phase difference between alternating voltage and alternating current be not equal to zero.
PFC(Power Factor Correction, Active PFC) circuit can improve the utilance of electric energy, the pollution of the harmonic wave that minimizing power consumption equipment produces to electrical network, especially active PFC circuit can be brought up to power factor value more than 0.99, to greatly improve the active power of circuit and reduce circuit harmonizing wave, so range of application be more and more wider.Current active PFC circuit as shown in Figure 1, determined by divider resistance R1 and R2 by the voltage of the voltage transitions sampled point of its PFC chip.When output voltage is constant, the magnitude of voltage that its sampling obtains is also constant, and the pfc circuit output voltage under this structure is fixed, and has following defect and deficiency: on the one hand, the situation that can not be applied to low-voltage (such as input voltage is 85V), has limited its range of application; On the other hand, when the feedback loop of pfc circuit occurs that when abnormal, protective circuit, easily causes that PFC boosts extremely effectively, causes whole circuit to be damaged.
Summary of the invention
The object of the present invention is to provide a kind of active PFC circuit and control method thereof, be intended to solve the technical problem that existing active PFC circuit output voltage is fixed, boost value can not change with input voltage.
First aspect, active PFC circuit provided by the invention, comprises main power source unit, PFC unit and the filter unit joining with load, output voltage sampling unit, as improvement, described active PFC circuit also comprises:
The alternating voltage sampling unit that is connected with described main power source unit, the alternating voltage of input is sampled;
Be connected to the current sampling unit of sampling between described main power source unit and PFC unit, to the electric current of described main power source unit output; And
Be connected to AC-input voltage Vac and the comparison of direct voltage Vdc, the corresponding adjusting obtaining between described alternating voltage sampling unit and output voltage sampling unit, according to sampling and export pressure regulation pwm signal to described PFC unit, the output voltage regulon of revising exporting to the direct voltage of described load.
Second aspect, a kind of control method of active PFC circuit as above comprises:
Step S1, the AC-input voltage Vac signal that sampling obtains according to alternating voltage sampling unit, calculate target DC voltage value Vmdc, also determine that the correction of target DC voltage value Vmdc is interval;
Step S2, output pressure regulation pwm signal, the direct voltage of load is exported in PFC unit according to the duty cycle adjustment of this pwm signal;
Step S3, obtain the direct voltage Vdc that output voltage sampling unit sampling obtains, judge that described direct voltage Vdc is whether in the correction interval of described target DC voltage value Vmdc: be to think working properly; No, the duty ratio of the pressure regulation pwm signal that further adjustment is exported.
A kind of active PFC circuit provided by the invention and control method thereof, can be by the single-chip microcomputer in output voltage regulon, the variation of following input voltage regulates and revises the pressure regulation pwm signal of its output, can adapt to the application scenarios that AC-input voltage constantly changes, improved the power factor of whole pfc circuit, cost is low, utilization is flexible, control is simple and reliability is high.
Accompanying drawing explanation
Fig. 1 is the structure diagram of active PFC circuit in prior art;
Fig. 2 is the structured flowchart of the active PFC circuit that provides of the embodiment of the present invention;
Fig. 3 is the example electronic devices and components figure of the active PFC circuit that provides of the embodiment of the present invention;
Fig. 4 is the control method realization flow figure of the active PFC circuit that provides of the 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 object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Fig. 2 is the structured flowchart of the active PFC circuit that provides of the embodiment of the present invention; For convenience of explanation, only show the part relevant to the present embodiment, as shown in the figure:
An active PFC circuit, comprises main power source unit 100, PFC unit 200 and the filter unit 300 joining with load, output voltage sampling unit 400, and as improvement, active PFC circuit also comprises:
The alternating voltage sampling unit 500 that is connected with main power source unit 100, the alternating voltage of input is sampled;
Be connected to the current sampling unit 600 of sampling between 100YuPFC unit, main power source unit 200, to the electric current of main power source unit 100 outputs; And
Be connected to AC-input voltage Vac and the comparison of direct voltage Vdc, the corresponding adjusting obtaining between alternating voltage sampling unit 500 and output voltage sampling unit 400, according to sampling and export pressure regulation pwm signal to PFC unit 200, the output voltage regulon 700 of revising exporting to the direct voltage of load.
The active PFC circuit providing according to the present embodiment, by an output voltage regulon 700, the AC-input voltage Vac that can obtain according to sampling and the comparison of direct voltage Vdc, corresponding adjusting and output pressure regulation pwm signal are to PFC unit 200, making to repair up-regulated PFC boost value can follow input voltage and change, adapt to the application scenarios that AC-input voltage constantly changes, improved the power factor of whole pfc circuit, cost is low, utilization is flexible, control is simple and reliability is high.
Fig. 3 is the example electronic devices and components figure of the active PFC circuit that provides of the embodiment of the present invention; For convenience of explanation, only show the part relevant to the present embodiment, as shown in the figure:
As one embodiment of the invention, main power source unit 100 comprises AC power, rectifier bridge stack BR1 and the filter capacitor C1 joining successively; Two inputs of rectifier bridge stack BR1 meet respectively live wire L and the zero line N of AC power, and the alternating voltage of input is carried out to rectification, and filter capacitor C1 is used for leaching circuit high-frequency noise; Filter unit 300 comprises electrochemical capacitor E1; Electrochemical capacitor E1 is connected between the negative electrode and ground of diode D1, and load RL is attempted by respectively the two ends of electrochemical capacitor E1.
Alternating voltage sampling unit 500 comprises resistance R 5, and the two ends of resistance R 5 connect respectively the live wire L of AC power and the input of output voltage regulon 700.
As one embodiment of the invention, output voltage sampling unit 400 comprises resistance R 6 and resistance R 7; Resistance R 6 and resistance R 7 are serially connected between the negative electrode and ground of diode D1 successively, and the public connecting end of resistance R 6 and resistance R 7 is the output of output voltage sampling unit 400.
As one embodiment of the invention, output voltage regulon 700 comprises single-chip microcomputer IC2 and NPN type triode Q1; Single-chip microcomputer IC2 is connected with the output of alternating voltage sampling unit 500, the base stage of NPN type triode Q1 connects the pwm signal output of single-chip microcomputer IC2, the drain electrode of NPN type triode Q1 connects the output of output voltage sampling unit 400, the source ground of NPN type triode Q1; The single-chip microcomputer IC2 AC-input voltage Vac that 400 samplings obtain according to output voltage sampling unit calculates target DC voltage value Vmdc, determines that its correction is interval, magnitude relationship, corresponding adjusting and the output pwm signal of the direct voltage Vdc obtaining according to target DC voltage value Vmdc and sampling, by changing electric current in NPN type triode Q1 drain electrode, revising exporting to the direct voltage of described load RL.General, all to make the duty ratio of pwm signal increase, the electric current of NPN type triode Q1 drain electrode increases, thereby the electric current that flows through resistance R 6 increases, makes the direct voltage Vdc that exports to load to increase, constantly adjust, until direct voltage Vdc is fallen in the correction interval of target DC voltage value Vmdc.
PFC unit 200 comprises PFC chip IC 1, inductance L 1, insulated gate bipolar transistor IGBT and diode D1; Current sampling unit 600 comprises resistance R 1, resistance R 2, resistance R 3 and resistance R 4; Here, the model of PFC chip IC 1 is not limit, for example, can select the UCC2818 of TI company.In fact, the PFC chip that includes but not limited to UCC28, UCC38, UC28 and the UC38 series of TI company is all feasible.Insulated gate bipolar transistor IGBT is to boost to realize as the energy storage of switching device control inductance L 1; The output of the first termination main power source unit 100 of inductance L 1, the second end of inductance L 1 connects the drain electrode of insulated gate bipolar transistor IGBT and the anode of diode D1 simultaneously, the negative electrode of diode D1 connects filter unit 300 and output voltage sampling unit 400 simultaneously, the source ground of insulated gate bipolar transistor IGBT, the grid of insulated gate bipolar transistor IGBT connects the driver output pin of PFC chip IC 1, and the output voltage of PFC chip IC 1 detects pin VSENSE and connects the Voltage loop amplification output pin VOUT of self and the output of output voltage sampling unit 400 simultaneously; Resistance R 3 is connected between the electric current loop input pin CAI and ground of PFC chip IC 1, resistance R 2 is connected between the multiplier output pin MOUT and ground of PFC chip IC 1, connecting resistance R2, resistance R 3 are away from one end of PFC chip IC 1 respectively for the two ends of resistance R 1, and resistance R 4 is connected to the output of rectifier bridge stack BR1 and samples between input pin IAC with the line current of PFC chip IC 1.
The active PFC circuit providing according to the embodiment of the present invention, the control method realization flow figure of the active PFC circuit providing as shown in Figure 4:
Step S1: the AC-input voltage Vac signal that sampling obtains according to alternating voltage sampling unit, calculates target DC voltage value Vmdc, also determines that the correction of target DC voltage value Vmdc is interval.
In this step, first output voltage regulon obtains the AC-input voltage Vac signal that the sampling of alternating voltage sampling unit obtains, and calculates accordingly target DC voltage value Vmdc, also determines that the correction of target DC voltage value Vmdc is interval.When specific implementation, can adopt the flow process shown in Fig. 5 to realize.As shown in Figure 5:
Step S11, obtain the AC-input voltage Vac signal that alternating voltage sampling unit sampling obtains.
Step S12, according to the default pfc circuit coefficient M that boosts, by relational expression Vmdc=M*Vac, calculate target DC voltage value Vmdc.
Step S13, determine the correction of target DC voltage value Vmdc interval be [Vmdc-N, Vmdc+N], wherein, N is default voltage correction value.
In the realization of this step S1, most critical be the coefficient M that boosts of pre-set pfc circuit.From mentality of designing, the in the situation that of pfc circuit bringing onto load RL, because load RL also will consume a part of electric energy, cause the direct voltage Vdc of output to reduce, will boost by pfc circuit.On the power consumption of balance PFC unit itself and the basis of power utilization rate, can set the coefficient M=1.4 that boosts, be Vmdc=1.4*Vac, at this moment target DC voltage value (namely boost value) is close to the peak value of alternating voltage, and this is to consider the coefficient that in PFC unit, IGBT heating situation obtains.Moreover, according to the concrete environment for use of active PFC circuit and default voltage correction value N, determine that the correction interval of target DC voltage value Vmdc is [Vmdc-N, Vmdc+N].For example, voltage correction value N can be made as 5V, and control system ac power supply voltage effective value Vac is 220V, if a Vac signal is obtained in sampling, is 220V, calculating a corresponding target DC voltage value Vmdc is 320V, revises interval and is 315V to 325V.
Step S2: output pressure regulation pwm signal, the direct voltage of load is exported in PFC unit according to the duty cycle adjustment of this pwm signal.
In the course of work of whole active PFC circuit, output voltage regulon can constantly be adjusted output pressure regulation pwm signal, PFC unit again according to the duty ratio of this pwm signal in real time regulation output to the direct voltage of load RL.
Step S3: obtain the direct voltage Vdc that output voltage sampling unit sampling obtains, judge that described direct voltage Vdc is whether in the correction interval of described target DC voltage value Vmdc: be to think working properly; No, the duty ratio of the pressure regulation pwm signal that further adjustment is exported.
In this step, the direct voltage Vdc that output voltage regulon Real-time Obtaining voltage sample unit sampling obtains, judge that whether its size in the correction interval of definite target DC voltage value Vmdc, if so, represents that active PFC circuit is working properly in step S1; If not, further adjust the duty ratio of the pressure regulation pwm signal of output.During specific implementation, can be with reference to the flow process shown in Fig. 6.As shown in Figure 6:
Step S31, obtain the direct voltage Vdc that output voltage sampling unit sampling obtains;
Step S32, judge that described direct voltage Vdc is whether in the correction interval of described target DC voltage value Vmdc: be to think working properly; No, enter step S33;
If the described direct voltage Vdc of step S33 is less than (Vmdc-N), according to the pre-conditioned duty ratio that progressively increases pressure regulation pwm signal; If described direct voltage Vdc is greater than (Vmdc+N), according to the pre-conditioned duty ratio that progressively reduces pressure regulation pwm signal.
In this step S3, PFC unit regulates direct voltage according to pressure regulation pwm signal, voltage sample unit sampling obtains a direct voltage Vdc, judges that this direct voltage Vdc is whether in the scope of the correction interval (such as 315V-325V) of the target DC voltage value Vmdc being determined by step S1.Suppose the Vdc=320V that sampling is obtained, represent that PFC pressure regulation is normal; If direct voltage Vdc is not in the correction interval of target DC voltage value Vmdc, according to the pre-conditioned duty ratio that progressively increases or reduce pressure regulation pwm signal, the adjustment that for example can set is each time all to increase or reduce 1% duty ratio.If Vdc=312V, is to be less than minimum target voltage values 315V, now output voltage regulon can be revised PWM output, according to the pre-conditioned duty ratio that progressively increases pressure regulation pwm signal.For example, the adjustment that can set is each time all to increase by 1% duty ratio: if Vdc=328V, be to be greater than maximum target voltage values 325V, now output voltage regulon can be revised PWM output, according to the pre-conditioned duty ratio that progressively reduces pressure regulation pwm signal.For example, the adjustment that can set is each time all to reduce 1% duty ratio.Every adjustment once, all continues the direct voltage Vdc that real-time sampling obtains output, continues judge that direct voltage Vdc whether in the scope in the correction interval of target DC voltage value Vmdc, finally makes direct voltage Vdc reach the correction interval of target DC voltage value.
Step S4: when the duty ratio of pressure regulation pwm signal be adjusted to default the most at high proportion or during minimum ratio, if described direct voltage Vdc not yet in the correction interval of described target DC voltage value Vmdc, sends the early warning signal of pfc circuit operation irregularity.
In this step, if the duty ratio of pressure regulation pwm signal has been adjusted to default the most at high proportion or during minimum ratio (such as presetting maximum increases or reducing 5% dutyfactor value), if the direct voltage Vdc that sampling is obtained in the correction interval of corresponding target DC voltage value Vmdc, does not send the early warning signal of pfc circuit operation irregularity yet.Increase this step, more improved the security reliability of this active PFC circuit.
In sum, a kind of active PFC circuit provided by the invention and control method thereof, can be by the single-chip microcomputer in output voltage regulon, according to the variation of alternating voltage, regulate the pressure regulation pwm signal of revising its output, make the direct voltage of exporting to load follow the variation of input voltage and change, can adapt to the application scenarios that AC-input voltage constantly changes, improve the power factor of whole electrical equipment, cost is low, utilization is flexible, control is simple and reliability is high.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, although the present invention has been carried out to more detailed explanation with reference to previous embodiment, for a person skilled in the art, its technical scheme that still can record aforementioned each embodiment is modified or part technical characterictic is wherein equal to replacement.All any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. an active PFC circuit, comprises main power source unit, PFC unit and the filter unit joining with load, output voltage sampling unit, it is characterized in that, described active PFC circuit also comprises:
The alternating voltage sampling unit that is connected with described main power source unit, the alternating voltage of input is sampled;
Be connected to the current sampling unit of sampling between described main power source unit and PFC unit, to the electric current of described main power source unit output; And
Be connected to AC-input voltage Vac and the comparison of direct voltage Vdc, the corresponding adjusting obtaining between described alternating voltage sampling unit and output voltage sampling unit, according to sampling and export pressure regulation pwm signal to described PFC unit, the output voltage regulon of revising exporting to the direct voltage of described load.
2. active PFC circuit as claimed in claim 1, is characterized in that: described output voltage regulon comprises single-chip microcomputer IC2 and NPN type triode Q1; Described single-chip microcomputer IC2 is connected with the output of described alternating voltage sampling unit, the base stage of described NPN type triode Q1 connects the pwm signal output of described single-chip microcomputer IC2, the drain electrode of described NPN type triode Q1 connects the output of described output voltage sampling unit, the source ground of described NPN type triode Q1;
The AC-input voltage Vac that described single-chip microcomputer IC2 obtains by sampling calculates the correction interval of target DC voltage value Vmdc, magnitude relationship, corresponding adjusting and the output pwm signal of the direct voltage Vdc obtaining according to described target DC voltage value Vmdc and sampling, by changing electric current in described NPN type triode Q1 drain electrode, revising exporting to the direct voltage of described load.
3. active PFC circuit as claimed in claim 1 or 2, is characterized in that:
Described main power source unit comprises AC power, rectifier bridge stack BR1 and the filter capacitor C1 joining successively; Described rectifier bridge stack BR1 carries out rectification to alternating voltage, and described filter capacitor C1 leaches circuit high-frequency noise;
Described alternating voltage sampling unit comprises resistance R 5, and the two ends of described resistance R 5 connect respectively the live wire L of described AC power and the input of described output voltage regulon.
4. active PFC circuit as claimed in claim 3, is characterized in that: described PFC unit comprises PFC chip IC 1, inductance L 1, insulated gate bipolar transistor IGBT and diode D1; Described current sampling unit comprises resistance R 1, resistance R 2, resistance R 3 and resistance R 4;
The output of main power source unit described in the first termination of described inductance L 1, the second end of described inductance L 1 connects the drain electrode of described insulated gate bipolar transistor IGBT and the anode of described diode D1 simultaneously, the negative electrode of described diode D1 connects described filter unit and described output voltage sampling unit simultaneously, the source ground of described insulated gate bipolar transistor IGBT, the grid of described insulated gate bipolar transistor IGBT connects the driver output pin of described PFC chip IC 1, the output voltage of described PFC chip IC 1 detects pin and connects the Voltage loop amplification output pin of self and the output of described output voltage sampling unit simultaneously,
Described resistance R 3 is connected between the electric current loop input pin and ground of described PFC chip IC 1, described resistance R 2 is connected between the multiplier output pin and ground of described PFC chip IC 1, the two ends of described resistance R 1 connect respectively described resistance R 2, described resistance R 3 away from one end of described PFC chip IC 1, and described resistance R 4 is connected between the output of described rectifier bridge stack BR1 and the line current of described PFC chip IC 1 sampling input pin.
5. active PFC circuit as claimed in claim 4, is characterized in that: described output voltage sampling unit comprises resistance R 6 and resistance R 7;
Described resistance R 6 and resistance R 7 are serially connected between the negative electrode and ground of described diode D1 successively, and the public connecting end of described resistance R 6 and resistance R 7 is the output of described output voltage sampling unit.
6. active PFC circuit as claimed in claim 5, is characterized in that: described filter unit comprises electrochemical capacitor E1;
Described electrochemical capacitor E1 is connected between the negative electrode and ground of described diode D1, and described load is attempted by respectively the two ends of described electrochemical capacitor E1.
7. a control method for the active PFC circuit as described in claim 1-6 any one, is characterized in that, described method comprises:
Step S1, the AC-input voltage Vac signal that sampling obtains according to alternating voltage sampling unit, calculate target DC voltage value Vmdc, also determine that the correction of target DC voltage value Vmdc is interval;
Step S2, output pressure regulation pwm signal, the direct voltage of load is exported in PFC unit according to the duty cycle adjustment of this pwm signal;
Step S3, obtain the direct voltage Vdc that output voltage sampling unit sampling obtains, judge that described direct voltage Vdc is whether in the correction interval of described target DC voltage value Vmdc: be to think working properly; No, the duty ratio of the pressure regulation pwm signal that further adjustment is exported.
8. the control method of active PFC circuit as claimed in claim 7, is characterized in that, described step S1 is specially:
Step S11, obtain the AC-input voltage Vac signal that alternating voltage sampling unit sampling obtains;
Step S12, according to the default pfc circuit coefficient M that boosts, by relational expression Vmdc=M*Vac, calculate target DC voltage value Vmdc;
Step S13, determine the correction of target DC voltage value Vmdc interval be [Vmdc-N, Vmdc+N], wherein, N is default voltage correction value.
9. the control method of active PFC circuit described in claim 8, is characterized in that, described step S3 is specially:
Step S31, obtain the direct voltage Vdc that output voltage sampling unit sampling obtains;
Step S32, judge that described direct voltage Vdc is whether in the correction interval of described target DC voltage value Vmdc: be to think working properly; No, enter step S33;
If the described direct voltage Vdc of step S33 is less than (Vmdc-N), according to the pre-conditioned duty ratio that progressively increases pressure regulation pwm signal; If described direct voltage Vdc is greater than (Vmdc+N), according to the pre-conditioned duty ratio that progressively reduces pressure regulation pwm signal.
10. the control method of active PFC circuit as claimed in claim 7, is characterized in that, after described step S33, also comprises:
Step S4, when the duty ratio of pressure regulation pwm signal be adjusted to default the most at high proportion or during minimum ratio, if described direct voltage Vdc not yet in the correction interval of described target DC voltage value Vmdc, sends the early warning signal of pfc circuit operation irregularity.
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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 |
| CN107368137A (en) * | 2016-12-19 | 2017-11-21 | 山东金洲科瑞节能科技有限公司 | Alternating Current Power Supply quality regulator |
| CN110739834A (en) * | 2019-10-10 | 2020-01-31 | 珠海格力节能环保制冷技术研究中心有限公司 | Suppression method and device for bus voltage harmonics, 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 |
| CN112524853A (en) * | 2020-12-09 | 2021-03-19 | 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 |
| CN112798997A (en) * | 2020-12-30 | 2021-05-14 | 四川长虹空调有限公司 | Frequency converter direct-current voltage detection and correction method |
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| CN104113199B (en) | 2018-03-16 |
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