CN111697816A - Power factor correction circuit, device and method - Google Patents
Power factor correction circuit, device and method Download PDFInfo
- Publication number
- CN111697816A CN111697816A CN202010471585.0A CN202010471585A CN111697816A CN 111697816 A CN111697816 A CN 111697816A CN 202010471585 A CN202010471585 A CN 202010471585A CN 111697816 A CN111697816 A CN 111697816A
- Authority
- CN
- China
- Prior art keywords
- circuit
- voltage
- power factor
- factor correction
- pulsating direct
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000006243 chemical reaction Methods 0.000 claims abstract description 25
- 230000009467 reduction Effects 0.000 claims abstract description 9
- 239000003990 capacitor Substances 0.000 claims description 31
- 230000000087 stabilizing effect Effects 0.000 claims description 18
- 230000000694 effects Effects 0.000 abstract description 10
- 230000007547 defect Effects 0.000 description 7
- 230000008569 process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
-
- 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
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The application discloses a power factor correction circuit, which comprises a rectifier bridge, a rectifier bridge and a rectifier bridge, wherein the rectifier bridge is used for rectifying input alternating-current voltage to obtain pulsating direct-current voltage and outputting the pulsating direct-current voltage; the switching circuit is used for performing circuit switching according to the pulsating direct current voltage and the output voltage of the power factor correction circuit, so that the Buck circuit works when the pulsating direct current voltage is higher than the output voltage of the power factor correction circuit, and the Boost circuit works when the pulsating direct current voltage is lower than the output voltage of the power factor correction circuit; the Boost circuit is used for performing Boost conversion on the pulsating direct current voltage to obtain an output voltage; and the Buck circuit is used for carrying out voltage reduction conversion on the pulsating direct current voltage to obtain output voltage. The power factor correction circuit has the characteristics of high conversion efficiency, strong output current control capability, high input current power factor, small harmonic distortion and the like. The application also discloses a power factor correction device and a method, and the power factor correction device and the method also have the technical effects.
Description
Technical Field
The application relates to the technical field of server power supplies, in particular to a power factor correction circuit; also relates to a power factor correction device and a method.
Background
In order to reduce the influence of the input current harmonic of the AC/DC converter in the server room on the Power grid and reduce the electricity cost caused thereby, an active PFC (Power Factor Correction) technology is generally applied to the AC/DC converter, so that the input current meets the requirements of the relevant standards.
At present, when power factor correction is carried out, most Boost circuits are adopted as front-stage PFC circuits, the front-stage PFC circuits have the characteristics of small input current power harmonic distortion and wide input voltage range, and meanwhile, the front-stage PFC circuits have the defects of low conversion efficiency, inconvenience for efficiency optimization of a rear-stage chopper and the like. Although the Buck circuit can make up for the defects, the Buck circuit has the defects of dead zones, poor input current power factors and the like.
The server board-level power supply is mostly 48V or 12V, and belongs to low-voltage large-current load. When the power factor correction circuit is used for reducing harmonic pollution to a power grid in the server room, if the Buck circuit for reducing voltage is only adopted, the problems of dead areas of input current and poor input power factors exist, and if the Boost circuit for boosting is only adopted, the problems that when the input voltage is low, the conversion efficiency is low, the efficiency optimization of a rear-stage chopper is not facilitated and the like exist.
Therefore, how to solve the technical defects becomes a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The application aims to provide a power factor correction circuit which has the characteristics of high conversion efficiency, strong output current control capability, high input current power factor, small harmonic distortion and the like. Another object of the present application is to provide a power factor correction device and method, which also have the above technical effects.
In order to solve the above technical problem, the present application provides a power factor correction circuit, including:
the circuit comprises a rectifier bridge, a switching circuit, a Boost circuit and a Buck circuit;
the rectifier bridge is used for rectifying the input alternating-current voltage to obtain pulsating direct-current voltage and outputting the pulsating direct-current voltage;
the switching circuit is used for performing circuit switching according to the pulsating direct current voltage and the output voltage of the power factor correction circuit, so that the Buck circuit works when the pulsating direct current voltage is higher than the output voltage of the power factor correction circuit, and the Boost circuit works when the pulsating direct current voltage is lower than the output voltage of the power factor correction circuit;
the Boost circuit is used for performing Boost conversion on the pulsating direct current voltage to obtain the output voltage;
and the Buck circuit is used for carrying out voltage reduction conversion on the pulsating direct current voltage to obtain the output voltage.
Optionally, the switching circuit includes:
the circuit comprises a first switch tube, a voltage stabilizing diode, a first resistor, a second resistor and a first capacitor;
the first end of the first switch tube is connected with the output voltage after being connected with the first resistor in series, and is connected with the cathode of the voltage stabilizing diode, the anode of the voltage stabilizing diode is connected with the output end of the rectifier bridge, the second end of the first switch tube is connected with the output end of the rectifier bridge, the third end of the first switch tube is connected with the input end of the Boost circuit, and the second resistor and the first capacitor are connected with each other in parallel after being connected with each other in series and are connected with the second end and the third end of the first switch tube.
Optionally, the first switching tube is an N-channel MOS tube; the first end of the first switch tube is a grid electrode of an N-channel MOS tube, the second end of the first switch tube is a source electrode of the N-channel MOS tube, and the third end of the first switch tube is a drain electrode of the N-channel MOS tube;
when the pulsating direct current voltage is higher than the output voltage of the power factor correction circuit, the voltage stabilizing diode is conducted, the grid electrode and the source electrode of the N-channel MOS tube are both connected with the pulsating direct current voltage, and the N-channel MOS tube is cut off; when the pulsating direct current voltage is lower than the sum of the output voltage of the power factor correction circuit and the reverse conduction voltage of the voltage stabilizing diode, the voltage stabilizing diode is conducted reversely, the voltage of the grid electrode of the N-channel MOS tube is the end voltage of the voltage stabilizing diode after reverse conduction, the voltage of the source electrode of the N-channel MOS tube is the pulsating direct current voltage, and the N-channel MOS tube is conducted.
Optionally, the Boost circuit includes:
the first inductor, the second switch tube, the third switch tube and the second capacitor;
one end of the first inductor is used as an input end of the Boost circuit, the other end of the first inductor is connected with the third end of the second switching tube and the third end of the third switching tube, the second end of the second switching tube is connected with one end of the second capacitor, the second end of the third switching tube is connected with the other end of the second capacitor, and the second capacitor is connected with a load in parallel.
Optionally, the Buck circuit includes:
the second inductor, the fourth switching tube, the fifth switching tube and the third capacitor;
the third end of the fourth switch tube is connected with the output end of the rectifier bridge, the second end of the fourth switch tube is respectively connected with one end of the second inductor and the third end of the fifth switch tube, the other end of the second inductor is connected with one end of the third capacitor, the second end of the fifth switch tube is connected with the other end of the second inductor, and the third capacitor is connected with the load in parallel.
Optionally, the Boost circuit and the Buck circuit share a common capacitor.
Optionally, the second switching tube to the fifth switching tube are all N-channel MOS tubes.
In order to solve the above technical problem, the present application further provides a power factor correction device, which includes the power factor correction circuit as described above.
In order to solve the above technical problem, the present application further provides a power factor correction method, including:
collecting the output voltage of the power factor correction circuit;
comparing the output voltage with the pulsating direct current voltage output by the rectifier bridge;
switching the circuit according to the comparison result so that the Buck circuit works when the pulsating direct current voltage is higher than the output voltage of the power factor correction circuit; and when the pulsating direct current voltage is lower than the output voltage of the power factor correction circuit, the Boost circuit works.
Optionally, the performing circuit switching according to the comparison result includes:
and according to the comparison result, switching the circuit by controlling the conduction state of a switching tube connected in series with the Boost circuit.
The power factor correction circuit provided by the application comprises: the circuit comprises a rectifier bridge, a switching circuit, a Boost circuit and a Buck circuit; the rectifier bridge is used for rectifying the input alternating-current voltage to obtain pulsating direct-current voltage and outputting the pulsating direct-current voltage; the switching circuit is used for performing circuit switching according to the pulsating direct current voltage and the output voltage of the power factor correction circuit, so that the Buck circuit works when the pulsating direct current voltage is higher than the output voltage of the power factor correction circuit, and the Boost circuit works when the pulsating direct current voltage is lower than the output voltage of the power factor correction circuit; the Boost circuit is used for performing Boost conversion on the pulsating direct current voltage to obtain the output voltage; and the Buck circuit is used for carrying out voltage reduction conversion on the pulsating direct current voltage to obtain the output voltage.
Therefore, the power factor correction circuit provided by the application integrates the Boost circuit and the Buck circuit, and utilizes the switching circuit to realize automatic switching of the circuits according to input and output voltages, so that the Boost circuit and the Buck circuit work under different voltage working conditions, respective advantages of the Boost circuit and the Buck circuit are exerted, and defects of the Boost circuit and the Buck circuit are avoided. Under the condition that the instantaneous voltage of the pulsating direct-current voltage output by the rectifier bridge is higher, the Buck circuit works, and the effects of strong output current control capability, high conversion efficiency and the like are achieved. Under the condition that the instantaneous voltage of the pulsating direct-current voltage output by the rectifier bridge is lower, the Boost circuit works to make up the current dead zone of the Buck circuit and achieve the effects of high input current power factor and small harmonic distortion.
The power factor correction device and the power factor correction method have the technical effects.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the prior art and the embodiments are briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic diagram of a power factor correction circuit according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of another power factor correction circuit according to an embodiment of the present disclosure;
fig. 3 is a flowchart illustrating a power factor correction method according to an embodiment of the present disclosure.
Detailed Description
The core of the application is to provide a power factor correction circuit which has the characteristics of high conversion efficiency, strong output current control capability, high input current power factor, small harmonic distortion and the like. Another core of the present application is to provide a power factor correction apparatus and method, which also have the above technical effects.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic diagram of a power factor correction circuit according to an embodiment of the present disclosure, and referring to fig. 1, the power factor correction circuit includes:
the rectifier bridge 10, the switching circuit 20, the Boost circuit 30 and the Buck circuit 40;
a rectifier bridge 10 for rectifying an input ac voltage to obtain a pulsating dc voltage and outputting the pulsating dc voltage;
a switching circuit 20 for performing circuit switching according to the pulsating direct current voltage and the output voltage of the power factor correction circuit, so that the Buck circuit 40 operates when the pulsating direct current voltage is higher than the output voltage of the power factor correction circuit, and the Boost circuit 30 operates when the pulsating direct current voltage is lower than the output voltage of the power factor correction circuit;
a Boost circuit 30, configured to perform Boost conversion on the pulsating direct-current voltage to obtain an output voltage;
and the Buck circuit 40 is used for performing voltage reduction conversion on the pulsating direct current voltage to obtain an output voltage.
The composite power factor correction circuit is formed by integrating the Boost circuit 30 and the Buck circuit 40, and the automatic switching of the circuits is realized by utilizing the switching circuit 20 according to input and output voltages, so that the Boost circuit 30 and the Buck circuit 40 work under different voltage working conditions. The advantages of the Boost circuit 30 and the Buck circuit 40 are brought into play, the defects of the Boost circuit 30 and the Buck circuit 40 are overcome, and the purposes of high conversion efficiency, strong output current control capability, high input current power factor, small harmonic distortion and the like are achieved.
Specifically, the rectifier bridge 10 is connected to an input power supply, and is responsible for performing full-bridge rectification on an input ac voltage to obtain a pulsating dc voltage, and further outputting the pulsating dc voltage. The specific structure of the rectifier bridge 10 can refer to the prior art, such as a rectifier bridge composed of four diodes as shown in fig. 2.
The switching circuit 20 is responsible for performing circuit switching according to the pulsating direct current voltage output by the rectifier bridge 10 and the output voltage of the power factor correction circuit, so that the Buck circuit 40 operates when the pulsating direct current voltage is higher than the output voltage of the power factor correction circuit, and the Boost circuit 30 operates when the pulsating direct current voltage is lower than the output voltage of the power factor correction circuit. Namely, under the condition that the instantaneous voltage of the pulsating direct current voltage output by the rectifier bridge 10 is high, the Buck circuit 40 works, the power factor correction circuit works in a Buck PFC mode, the application scene of shaping the input current of the server room with high-voltage input and low-voltage power supply is met, and the effects of strong output current control capability, high conversion efficiency and the like are achieved. Under the condition that the instantaneous voltage of the pulsating direct-current voltage output by the rectifier bridge 10 is low, the Boost circuit 30 works, the power factor correction circuit works in a Boost PFC mode, Boost conversion is achieved, the current dead zone of the Buck circuit 40 can be made up, and the effects of high input current power factor and small harmonic distortion are achieved.
As shown in fig. 2, in a specific embodiment, the switching circuit 20 includes: a first switch tube S1, a voltage stabilizing diode ZD, a first resistor R1, a second resistor R2 and a first capacitor C1; the first end of the first switch tube S1 is connected in series with the first resistor R1 and then connected with the output voltage, and is connected with the cathode of the zener diode ZD, the anode of the zener diode ZD is connected with the output end of the rectifier bridge 10, the second end of the first switch tube S1 is connected with the output end of the rectifier bridge 10, the third end of the first switch tube S1 is connected with the input end of the Boost circuit 30, and the second resistor R2 is connected in series with the first capacitor C1 and then connected in parallel with the second end and the third end of the first switch tube S1. In this embodiment, the switching circuit 20 is connected in series with the Boost circuit, the Buck circuit is defaulted to work, and when the pulsating direct current voltage is lower than the output voltage of the power factor correction circuit and the Buck circuit 40 cannot work, the switching circuit 20 performs circuit switching to enable the Boost circuit 30 to work. The switching circuit 20 can realize automatic switching according to the input and output voltages without an additional control circuit, and has a simple structure.
In a specific embodiment, the first switch transistor S1 is an N-channel MOS transistor; the first end of the first switch tube S1 is a gate of the N-channel MOS transistor, the second end of the first switch tube S1 is a source of the N-channel MOS transistor, and the third end of the first switch tube S1 is a drain of the N-channel MOS transistor. Namely, the grid of the N-channel MOS transistor is connected in series with the first resistor R1 and then connected with the output voltage, and is connected with the cathode of the zener diode ZD, the anode of the zener diode ZD is connected with the output end of the rectifier bridge 10, the source of the N-channel MOS transistor is connected with the output end of the rectifier bridge 10, the drain of the N-channel MOS transistor is connected with the input end of the Boost circuit 30, and the second resistor R2 is connected in series with the capacitor and then connected in parallel with the source and the drain of the switching transistor. When the pulsating direct current voltage is higher than the output voltage of the power factor correction circuit, the voltage stabilizing diode ZD is conducted, the grid electrode and the source electrode of the N-channel MOS tube are both connected with the pulsating direct current voltage, and the N-channel MOS tube is cut off; when the pulsating direct current voltage is lower than the sum of the output voltage of the power factor correction circuit and the reverse conduction voltage of the voltage stabilizing diode ZD, the voltage of the grid electrode of the N-channel MOS tube is the end voltage of the voltage stabilizing diode after reverse conduction, the voltage of the source electrode of the N-channel MOS tube is the pulsating direct current voltage, and the N-channel MOS tube is conducted.
Specifically, when the pulsating direct current voltage output by the rectifier bridge 10 is greater than the output voltage of the power factor correction circuit, the N-channel MOS transistor in the switching circuit 20 is turned off, the Boost circuit 30 does not operate, the Buck circuit 40 operates, and the power factor correction circuit operates in the Buck PFC mode. When the pulsating direct current voltage output by the rectifier bridge 10 is equal to the output voltage of the power factor correction circuit, the Buck circuit 40 stops operating. Further, when the pulsating direct current voltage output by the rectifier bridge 10 is smaller than the sum of the output voltage of the power factor correction circuit and the reverse conduction threshold of the zener diode ZD, the N-channel MOS transistor in the switching circuit 20 is turned on, the Buck circuit 40 does not operate, the Boost circuit 30 operates, and the power factor correction circuit operates in the Boost PFC mode. The MOS transistor is used for circuit switching, so that the circuit loss is low and the efficiency is high.
A Boost circuit 30, configured to perform Boost conversion on the pulsating direct-current voltage to obtain an output voltage; and the Buck circuit 40 is used for performing voltage reduction conversion on the pulsating direct current voltage to obtain an output voltage.
As shown in fig. 2, the Boost circuit 30 includes:
a first inductor L1, a second switch tube S2, a third switch tube S3, and a second capacitor (not labeled); one end of the first inductor L1 serves as an input end of the Boost circuit 30, the other end of the first inductor L1 is connected to the third end of the second switch tube S2 and the third end of the third switch tube S3, the second end of the second switch tube S2 is connected to one end of the second capacitor, the second end of the third switch tube S3 is connected to the other end of the second capacitor, and the second capacitor is connected to a load (shown as R in the figure)load) And (4) connecting in parallel.
The Buck circuit 40 includes: a second inductor L2, a fourth switch tube S4, a fifth switch tube S5, and a third capacitor (not labeled); the third end of the fourth switching tube S4 is connected to the output end of the rectifier bridge 10, the second end of the fourth switching tube S4 is connected to one end of the second inductor L2 and the third end of the fifth switching tube S5, the other end of the second inductor L2 is connected to one end of the third capacitor, the second end of the fifth switching tube S5 is connected to the other end of the second inductor L2, and the third capacitor is connected to the load in parallel.
In addition, referring to fig. 2, in one specific embodiment, Boost circuit 30 shares a common capacitance with Buck circuit 40, i.e., C2 as shown in fig. 2. The second switch tube S2 to the fifth switch tube S5 are all N-channel MOS tubes.
The operating principle of the Boost circuit 30 is as follows: the input AC voltage is rectified by full bridge to obtain pulsating DC voltage VdcThe output voltage V is obtained through a Boost circuit 30o。
When VGS2When the voltage is high, the second switch tube S2 is turned on, the third switch tube S3 (follow current tube) is turned off, the first inductor L1 charges for energy storage, and the inductor current ILLinear increase, i.e.
Wherein D is1The duty cycle of the second switching tube S2 is T, and the switching period is T.
When VGS3When the voltage level is high, the third switch tube S3 (follow current tube) is turned on, the second switch tube S2 is turned off, the first inductor L1 discharges, the energy is released to charge the load, and the inductor current ILLinear reduction, i.e.
Wherein D is2The duty cycle of the third switching tube S3 is T, which is the switching period.
According to the principle of inductance charge-discharge balance, the method is obtained
The Boost circuit 30 has a Boost circuit structure, and when the input voltage is low, the conversion efficiency is low.
The Buck circuit 40 operates as follows: the input AC voltage is rectified by full bridge to obtain pulsating DC voltage VdcThe output voltage V is obtained through a Buck circuit 40o。
When VGS4When the voltage is high, the fourth switch tube S4 is turned on, and the fifth switch tube S5 (follow current tube) is turned offWhen the inductor is disconnected, the second inductor L2 charges to store energy and the inductor current ILLinear increase, i.e.
Until the load current is exceeded to begin charging the load. Wherein D is3The duty cycle of the fourth switching tube S4 is T, which is the switching period.
When VGS5When the voltage level is high, the fifth switch tube S5 (freewheeling tube) is turned on, the fourth switch tube S4 is turned off, the second inductor L2 releases energy, and the inductor current ILLinear reduction, i.e.
Wherein D is4The duty cycle of the fifth switching tube S5 is T, which is the switching period.
According to the principle of inductance charge-discharge balance, the method is obtained
The Buck circuit 40 is a step-down circuit structure, and when the input voltage is lower than the output voltage, it cannot be normally charged, and the input current is discontinuous.
Combining the above embodiments of the switching circuit 20, the Boost circuit 30 and the Buck circuit 40, the working principle of the power factor correction circuit is as follows:
when V isdc>VoIn the meantime, the zener diode ZD is turned on by the forward voltage, the first switching tube S1 in the switching circuit 20 is turned off, the Boost circuit 30 does not operate, the fourth switching tube S4 and the fifth switching tube S5 in the Buck circuit 40 operate, and the power factor correction circuit operates in the Buck PFC mode. According to the selected control mode, the conduction and the disconnection states of the second switching tube S2 and the third switching tube S3 are controlled by collecting the inductance current signals, so that the envelope curve of the inductance peak current changes along with the input voltage, and the purpose of power factor correction is achieved.
When V isdcDecreases to V with timedc＝VoThen, the potential across the second inductor L2 is equal, the current is 0, and the third switch tube S3 is no longer turned on.
VdcContinue to descend when Vdc<Vo+ Vt1 (Vt1 is the turn-on threshold of the parasitic diode of the third switch S3), the voltage across the second switch S2 is clamped, the first capacitor C1 is charged through the second resistor R2, and the voltage across the first capacitor C1 is VoAnd VdcThe difference of (a).
When V isdc<VoAt + Vt2 (Vt2 is a threshold value of the zener diode ZD in reverse conduction), the zener diode ZD is in reverse conduction, the voltage at two ends is stabilized at a fixed value, the model of the zener diode ZD whose reverse conduction voltage value is greater than the driving voltage threshold value of the first switching tube S1 is selected, at this time, the first switching tube S1 is turned on, the Boost circuit 30 operates, and the power factor correction circuit operates in the Boost PFC mode. Meanwhile, the voltage across the first switch tube S1 is Vt2, and the turn-on loss is small. At the moment when the first switch tube S1 is turned on, the first inductor L1 flows a weak negative current from the output to the input, and controls the switch tube in the Boost circuit 30 to be turned on to continue charging the load. The switching process of the power factor correction circuit has dead zones, the circuit recovery time is reserved, and the reliability is high.
In summary, the power factor correction circuit provided in the present application includes: the circuit comprises a rectifier bridge, a switching circuit, a Boost circuit and a Buck circuit; the rectifier bridge is used for rectifying the input alternating-current voltage to obtain pulsating direct-current voltage and outputting the pulsating direct-current voltage; the switching circuit is used for performing circuit switching according to the pulsating direct current voltage and the output voltage of the power factor correction circuit, so that the Buck circuit works when the pulsating direct current voltage is higher than the output voltage of the power factor correction circuit, and the Boost circuit works when the pulsating direct current voltage is lower than the output voltage of the power factor correction circuit; the Boost circuit is used for performing Boost conversion on the pulsating direct current voltage to obtain an output voltage; and the Buck circuit is used for carrying out voltage reduction conversion on the pulsating direct current voltage to obtain output voltage. The power factor correction circuit integrates the Boost circuit and the Buck circuit, and utilizes the switching circuit to realize automatic switching of the circuits according to input and output voltages, so that the Boost circuit and the Buck circuit work under different voltage working conditions, the advantages of the Boost circuit and the Buck circuit are brought into play, and the defects of the Boost circuit and the Buck circuit are avoided. Under the condition that the instantaneous voltage of the pulsating direct-current voltage output by the rectifier bridge is higher, the Buck circuit works, and the effects of strong output current control capability, high conversion efficiency and the like are achieved. Under the condition that the instantaneous voltage of the pulsating direct-current voltage output by the rectifier bridge is lower, the Boost circuit works to make up the current dead zone of the Buck circuit and achieve the effects of high input current power factor and small harmonic distortion.
The present application further provides a power factor correction device, which includes the power factor correction circuit described in the above embodiments, and for the power factor correction device provided in the present application, details are not repeated herein, and relevant contents refer to the embodiments of the power factor correction circuit.
The present application also provides a power factor correction method, which is shown with reference to fig. 3 and includes:
s101: collecting the output voltage of the power factor correction circuit;
s102: comparing the output voltage with the pulsating direct current voltage output by the rectifier bridge;
s103: switching the circuit according to the comparison result so that the Buck circuit works when the pulsating direct current voltage is higher than the output voltage of the power factor correction circuit; when the pulsating direct current voltage is lower than the output voltage of the power factor correction circuit, the Boost circuit works.
On the basis of the foregoing embodiment, optionally, the performing circuit switching according to the comparison result includes:
and according to the comparison result, switching the circuit by controlling the conduction state of a switching tube of the series Boost circuit.
For the introduction of the power factor correction method provided in the present application, details of the power factor correction method are not repeated herein, and the related contents refer to the embodiments of the power factor correction circuit described above.
Because the situation is complicated and cannot be illustrated by a list, those skilled in the art can appreciate that there can be many examples in combination with the actual situation under the basic principle of the embodiments provided in the present application and that it is within the scope of the present application without sufficient inventive effort.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The power factor correction circuit, the power factor correction device and the power factor correction method provided by the application are described in detail above. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. A power factor correction circuit, comprising:
the circuit comprises a rectifier bridge, a switching circuit, a Boost circuit and a Buck circuit;
the rectifier bridge is used for rectifying the input alternating-current voltage to obtain pulsating direct-current voltage and outputting the pulsating direct-current voltage;
the switching circuit is used for performing circuit switching according to the pulsating direct current voltage and the output voltage of the power factor correction circuit, so that the Buck circuit works when the pulsating direct current voltage is higher than the output voltage of the power factor correction circuit, and the Boost circuit works when the pulsating direct current voltage is lower than the output voltage of the power factor correction circuit;
the Boost circuit is used for performing Boost conversion on the pulsating direct current voltage to obtain the output voltage;
and the Buck circuit is used for carrying out voltage reduction conversion on the pulsating direct current voltage to obtain the output voltage.
2. The power factor correction circuit of claim 1, wherein the switching circuit comprises:
the circuit comprises a first switch tube, a voltage stabilizing diode, a first resistor, a second resistor and a first capacitor;
the first end of the first switch tube is connected with the output voltage after being connected with the first resistor in series, and is connected with the cathode of the voltage stabilizing diode, the anode of the voltage stabilizing diode is connected with the output end of the rectifier bridge, the second end of the first switch tube is connected with the output end of the rectifier bridge, the third end of the first switch tube is connected with the input end of the Boost circuit, and the second resistor and the first capacitor are connected with each other in parallel after being connected with each other in series and are connected with the second end and the third end of the first switch tube.
3. The power factor correction circuit of claim 2, wherein the first switch transistor is an N-channel MOS transistor; the first end of the first switch tube is a grid electrode of an N-channel MOS tube, the second end of the first switch tube is a source electrode of the N-channel MOS tube, and the third end of the first switch tube is a drain electrode of the N-channel MOS tube;
when the pulsating direct current voltage is higher than the output voltage of the power factor correction circuit, the voltage stabilizing diode is conducted, the grid electrode and the source electrode of the N-channel MOS tube are both connected with the pulsating direct current voltage, and the N-channel MOS tube is cut off; when the pulsating direct current voltage is lower than the sum of the output voltage of the power factor correction circuit and the reverse conduction voltage of the voltage stabilizing diode, the voltage stabilizing diode is conducted reversely, the voltage of the grid electrode of the N-channel MOS tube is the end voltage of the voltage stabilizing diode after reverse conduction, the voltage of the source electrode of the N-channel MOS tube is the pulsating direct current voltage, and the N-channel MOS tube is conducted.
4. The power factor correction circuit of claim 3, wherein the Boost circuit comprises:
the first inductor, the second switch tube, the third switch tube and the second capacitor;
one end of the first inductor is used as an input end of the Boost circuit, the other end of the first inductor is connected with the third end of the second switching tube and the third end of the third switching tube, the second end of the second switching tube is connected with one end of the second capacitor, the second end of the third switching tube is connected with the other end of the second capacitor, and the second capacitor is connected with a load in parallel.
5. The power factor correction circuit of claim 4, wherein the Buck circuit comprises:
the second inductor, the fourth switching tube, the fifth switching tube and the third capacitor;
the third end of the fourth switch tube is connected with the output end of the rectifier bridge, the second end of the fourth switch tube is respectively connected with one end of the second inductor and the third end of the fifth switch tube, the other end of the second inductor is connected with one end of the third capacitor, the second end of the fifth switch tube is connected with the other end of the second inductor, and the third capacitor is connected with the load in parallel.
6. The power factor correction circuit of claim 5, wherein the Boost circuit and the Buck circuit share a common capacitance.
7. The power factor correction circuit of claim 6, wherein the second to fifth switching transistors are all N-channel MOS transistors.
8. A power factor correction device, characterized in that it comprises a power factor correction circuit according to any one of claims 1 to 7.
9. A method for power factor correction, comprising:
collecting the output voltage of the power factor correction circuit;
comparing the output voltage with the pulsating direct current voltage output by the rectifier bridge;
switching the circuit according to the comparison result so that the Buck circuit works when the pulsating direct current voltage is higher than the output voltage of the power factor correction circuit; and when the pulsating direct current voltage is lower than the output voltage of the power factor correction circuit, the Boost circuit works.
10. The power factor correction method of claim 9, wherein the switching the circuit according to the comparison result comprises:
and according to the comparison result, switching the circuit by controlling the conduction state of a switching tube connected in series with the Boost circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010471585.0A CN111697816B (en) | 2020-05-29 | 2020-05-29 | Power factor correction circuit, device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010471585.0A CN111697816B (en) | 2020-05-29 | 2020-05-29 | Power factor correction circuit, device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111697816A true CN111697816A (en) | 2020-09-22 |
| CN111697816B CN111697816B (en) | 2022-04-15 |
Family
ID=72478753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010471585.0A Active CN111697816B (en) | 2020-05-29 | 2020-05-29 | Power factor correction circuit, device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111697816B (en) |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001333580A (en) * | 2000-05-23 | 2001-11-30 | Mitsubishi Electric Corp | Dc power supply |
| US20070170897A1 (en) * | 2006-01-26 | 2007-07-26 | Advanced Analogic Technologies, Inc. | High-Frequency Power MESFET Buck Switching Power Supply |
| CN103154843A (en) * | 2010-08-27 | 2013-06-12 | 弗莱克斯电子有限责任公司 | Power converter with boost-buck-buck configuration |
| CN104682369A (en) * | 2013-11-28 | 2015-06-03 | 西安国龙竹业科技有限公司 | Direct current anti-reverse polarity circuit using MOS (metal oxide semiconductor) tube |
| CN104779784A (en) * | 2014-01-11 | 2015-07-15 | 亚荣源科技（深圳）有限公司 | Single-phase power factor corrector with voltage boosting and reduction functions |
| US20180316347A1 (en) * | 2015-05-07 | 2018-11-01 | Qm Power, Inc. | High Speed Switching Solid State Relay Circuit |
| CN109450243A (en) * | 2018-10-16 | 2019-03-08 | 广东美的制冷设备有限公司 | Pfc circuit, electric machine control system and air conditioner |
| CN109660120A (en) * | 2018-12-29 | 2019-04-19 | Tcl空调器(中山)有限公司 | Switching circuit, the control method of switching circuit, power supply device and air conditioner |
| CN109921626A (en) * | 2019-04-18 | 2019-06-21 | 珠海格力电器股份有限公司 | Power factor correction circuit and its control method, power factor correcting device |
| US20190199205A1 (en) * | 2017-12-27 | 2019-06-27 | Flex Ltd | Quasi-resonant buck-boost converter with voltage shifter control |
| CN110417259A (en) * | 2019-07-19 | 2019-11-05 | 广州金升阳科技有限公司 | A kind of self-switching type voltage regulator |
| US20200039375A1 (en) * | 2018-08-03 | 2020-02-06 | Jaya Sai Praneeth Ammanamanchi Venkata | Wide-output voltage range on-board battery charger for electric vehicles |
| CN210317466U (en) * | 2019-06-17 | 2020-04-14 | 郑州飞龙汽车部件有限公司 | Automobile electronic water pump controller and water pump |
-
2020
- 2020-05-29 CN CN202010471585.0A patent/CN111697816B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001333580A (en) * | 2000-05-23 | 2001-11-30 | Mitsubishi Electric Corp | Dc power supply |
| US20070170897A1 (en) * | 2006-01-26 | 2007-07-26 | Advanced Analogic Technologies, Inc. | High-Frequency Power MESFET Buck Switching Power Supply |
| CN103154843A (en) * | 2010-08-27 | 2013-06-12 | 弗莱克斯电子有限责任公司 | Power converter with boost-buck-buck configuration |
| CN104682369A (en) * | 2013-11-28 | 2015-06-03 | 西安国龙竹业科技有限公司 | Direct current anti-reverse polarity circuit using MOS (metal oxide semiconductor) tube |
| CN104779784A (en) * | 2014-01-11 | 2015-07-15 | 亚荣源科技（深圳）有限公司 | Single-phase power factor corrector with voltage boosting and reduction functions |
| US20180316347A1 (en) * | 2015-05-07 | 2018-11-01 | Qm Power, Inc. | High Speed Switching Solid State Relay Circuit |
| US20190199205A1 (en) * | 2017-12-27 | 2019-06-27 | Flex Ltd | Quasi-resonant buck-boost converter with voltage shifter control |
| US20200039375A1 (en) * | 2018-08-03 | 2020-02-06 | Jaya Sai Praneeth Ammanamanchi Venkata | Wide-output voltage range on-board battery charger for electric vehicles |
| CN109450243A (en) * | 2018-10-16 | 2019-03-08 | 广东美的制冷设备有限公司 | Pfc circuit, electric machine control system and air conditioner |
| CN109660120A (en) * | 2018-12-29 | 2019-04-19 | Tcl空调器(中山)有限公司 | Switching circuit, the control method of switching circuit, power supply device and air conditioner |
| CN109921626A (en) * | 2019-04-18 | 2019-06-21 | 珠海格力电器股份有限公司 | Power factor correction circuit and its control method, power factor correcting device |
| CN210317466U (en) * | 2019-06-17 | 2020-04-14 | 郑州飞龙汽车部件有限公司 | Automobile electronic water pump controller and water pump |
| CN110417259A (en) * | 2019-07-19 | 2019-11-05 | 广州金升阳科技有限公司 | A kind of self-switching type voltage regulator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111697816B (en) | 2022-04-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11496054B2 (en) | High-gain quasi-resonant DC-DC converter based on voltage doubling rectifier circuit | |
| WO2022062327A1 (en) | Improved switched-coupled-inductor quasi-z-source inverter | |
| CN110649805B (en) | High-gain Boost converter | |
| CN105939108A (en) | Switch inductor type quasi-switch voltage-boosting DC-DC converter | |
| CN105939112A (en) | High-gain quasi-switch boost DC-DC converter | |
| CN215934730U (en) | DC-DC converter with high step-up ratio | |
| CN219287377U (en) | Bidirectional DC conversion circuit and corresponding device | |
| CN111697816B (en) | Power factor correction circuit, device and method | |
| CN108429452B (en) | Quadratic multi-bootstrap DC-DC converter for photovoltaic system | |
| CN112398330B (en) | Bridgeless PFC converter and control method thereof | |
| Kajiwara et al. | Performance Mechanism of Active Clamp Resonant SEPIC Converter in Renewable Energy Systems | |
| Luewisuthichat et al. | Analysis and implement DC-DC integrated boost-flyback converter with LED street light stand-by application | |
| Kim et al. | Isolated double step-down DC-DC converter | |
| CN114301292A (en) | Soft switching type bidirectional BUCK-BOOST converter | |
| CN108448892B (en) | Quadratic form is many times presses unit DC-DC converter for photovoltaic system | |
| CN203691234U (en) | Dual output bus type high-gain converter based on coupling inductor voltage multiplying structure | |
| CN108429451B (en) | Cascaded multi-bootstrap DC-DC converter for photovoltaic system | |
| CN112886817A (en) | High-efficiency high-gain converter and control method thereof | |
| TW201703414A (en) | Direct current power converter | |
| CN104638946A (en) | Dual-winding transformer primary-side detection output voltage AC-DC converter | |
| CN204559414U (en) | Two winding transformer former limit detecting output voltage AC-DC converter | |
| CN213547169U (en) | Centralized charging device for multiple groups of batteries | |
| CN110277923A (en) | A kind of soft switch in three electrical levels DC converter of Active control primary current shutdown | |
| TWI581552B (en) | Boost converter | |
| CN218473035U (en) | Flyback conversion circuit, converter, servo motor and driver of servo motor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |