CN220874421U - Active power factor correction circuit and switching power supply - Google Patents
Active power factor correction circuit and switching power supply Download PDFInfo
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- CN220874421U CN220874421U CN202322591046.2U CN202322591046U CN220874421U CN 220874421 U CN220874421 U CN 220874421U CN 202322591046 U CN202322591046 U CN 202322591046U CN 220874421 U CN220874421 U CN 220874421U
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- 238000012544 monitoring process Methods 0.000 claims abstract description 18
- 230000001105 regulatory effect Effects 0.000 claims abstract description 18
- 230000001276 controlling effect Effects 0.000 claims abstract description 8
- 238000001914 filtration Methods 0.000 claims description 18
- 238000005070 sampling Methods 0.000 claims description 12
- 239000003990 capacitor Substances 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 7
- 230000011218 segmentation Effects 0.000 description 4
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- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
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- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
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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 utility model provides an active power factor correction circuit and a switching power supply, wherein the active power factor correction circuit comprises a power supply voltage input end, a PFC output control module and a PFC module which are connected in sequence; the PFC output control module comprises a voltage comparator, a unidirectional conduction device and a voltage regulating circuit; the input end of the voltage comparator is connected with the power supply voltage input end, and the output end of the voltage comparator is connected to a monitoring voltage acquisition pin of the PFC module through the unidirectional conduction device and the voltage regulating circuit in sequence; the PFC output control module is used for controlling the voltage value output to the PFC module according to the input voltage section. The utility model improves the working efficiency of the product during low-voltage input and improves the EMC of the product by accurately controlling the sectional voltage output.
Description
Technical Field
The utility model relates to the technical field of PFC circuits, in particular to an active power factor correction circuit and a switching power supply.
Background
A sectional boosting circuit and a switching power supply in the prior art have a circuit structure shown in fig. 1. The full voltage input active power factor correction power supply input voltage ranges from 90V-264V. As shown in FIG. 1, R12, R13 and R14 resistors are used for voltage division detection to detect the magnitude of input alternating voltage, when different voltages are input, the CE conducting voltage of the triode Q1 is different to cause the transformation of feedback voltage to realize the change of output voltage, and Q1 needs to work in an amplifying region.
The above prior art has the following drawbacks: the triode has different amplification factors, and the consistency of the segmented output voltage points is poor; meanwhile, when the input voltage is more than 160V, the output voltage changes along with the input voltage, and the EMC (electromagnetic compatibility) of the product is poor.
Disclosure of utility model
The technical problems to be solved by the utility model are as follows: the active power factor correction circuit and the switching power supply are provided, and the sectional voltage output is accurately controlled, so that the working efficiency of a product during low-voltage input is improved, and the EMC performance of the product is improved.
In order to solve the technical problems, the first technical scheme adopted by the utility model is as follows:
The active power factor correction circuit comprises a power supply voltage input end, a PFC output control module and a PFC module which are connected in sequence;
The PFC output control module comprises a voltage comparator, a unidirectional conduction device and a voltage regulating circuit; the input end of the voltage comparator is connected with the power supply voltage input end, and the output end of the voltage comparator is connected to a monitoring voltage acquisition pin of the PFC module through the unidirectional conduction device and the voltage regulating circuit in sequence;
The PFC output control module is used for controlling the voltage value output to the PFC module according to the input voltage section.
Optionally, the unidirectional conduction device is a diode, a thyristor or a transistor.
Optionally, the voltage regulating circuit includes a first resistor and a second resistor connected in parallel; one end of the first resistor and one end of the second resistor which are connected in parallel are connected with the output end of the unidirectional conduction device, and the other end of the first resistor and one end of the second resistor are connected with the monitoring voltage acquisition pin.
Optionally, the voltage regulating circuit includes a third resistor; one end of the third resistor is connected with the output end of the unidirectional conduction device, and the other end of the third resistor is connected with the monitoring voltage acquisition pin.
Optionally, the voltage comparator includes an operational amplifier OP1, an operational amplifier OP2, a fourth resistor, and a fifth resistor; the output end of the operational amplifier OP1 is connected with the output end of the operational amplifier OP2 and is used as the output end of the voltage comparator; the positive input end of the operational amplifier OP1 is connected with the positive input end of the operational amplifier OP2 through the fourth resistor, and the positive input end of the operational amplifier OP2 is connected with the fifth resistor and then used as an I CTRL pin of the voltage comparator; the negative input end of the operational amplifier OP2 serves as a v SENSE pin of the voltage comparator.
Optionally, the PFC output control module further includes a resistor R19; the output end of the voltage comparator is also connected to the I CTRL pin through the resistor R19.
Optionally, the PFC output control module further includes a sampling circuit; the input end of the voltage comparator is connected to the power supply voltage input end through the sampling circuit.
Optionally, the sampling circuit includes a diode D7, a diode D8, a resistor R9, a resistor R15, a resistor R30, a resistor R37, and a capacitor C24; the power supply voltage input end is respectively connected with the anodes of the diode D7 and the diode D8; the cathodes of the diode D7 and the diode D8 are connected to one end of the resistor R15 via the resistor R9; the other end of the resistor R15 is connected with the input end of the voltage comparator; after the resistor R30, the resistor R37 and the capacitor C24 are connected in parallel, one end of the resistor R30 is connected between the resistor R15 and the input end of the voltage comparator, and the other end of the resistor R37 is grounded.
Optionally, the PFC module includes a PFC controller, a fourth resistor, and a fifth resistor; the monitoring voltage acquisition pin of the PFC controller is divided into two paths, one path is grounded through the fourth resistor, and the other path is connected to the power BUS through the fifth resistor.
The second technical scheme adopted by the utility model is as follows:
A switching power supply comprises the active power factor correction circuit;
The active power factor correction circuit further includes: an EMI filtering module and a rectifying and filtering module;
the power supply voltage input end is connected to the PFC output control module through the EMI filtering module; and the EMI filtering module is also connected with the rectifying and filtering module and the PFC module in sequence.
The utility model has the beneficial effects that: the PFC output control module can accurately control the voltage value output to the PFC module in a segmented mode according to the sampled input voltage value; thereby improving the working efficiency of the power supply when the alternating current is input with low voltage and improving EMC. Particularly, compared with the detection control mode of a triode in the prior art, the PFC output control module can realize more accurate segmentation point control values; meanwhile, the problem of poor voltage consistency of the segmentation points can be solved.
Drawings
FIG. 1 is a schematic diagram of a prior art circuit configuration of a segmented boost circuit and a switching power supply;
fig. 2 is a schematic circuit diagram of an active power factor correction circuit according to an embodiment of the present utility model;
fig. 3 is a schematic diagram of an internal structure of a voltage comparator in a PFC output control module according to an embodiment of the present utility model;
Fig. 4 is a schematic circuit diagram of a PFC output control module in an active power factor correction circuit according to an embodiment of the present utility model;
Fig. 5 is a schematic diagram of an overall circuit structure of an active power factor correction circuit according to an embodiment of the present utility model.
Description of the reference numerals:
1. a power supply voltage input terminal; 2. a PFC output control module; 3. a PFC module;
4. An EMI filter module; 5. a rectifying and filtering module;
21. A voltage comparator; 22. a unidirectional conducting device; 23. a voltage regulating circuit;
31. and monitoring a voltage acquisition pin.
Detailed Description
In order to describe the technical contents, the achieved objects and effects of the present utility model in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.
Referring to fig. 2, fig. 2 is a schematic circuit diagram of an active power factor correction circuit according to an embodiment of the utility model. As shown in fig. 2, the active power factor correction circuit provided in this embodiment includes a power supply voltage input terminal 1, a PFC output control module 2 and a PFC module 3 connected in sequence;
The PFC output control module 2 comprises a voltage comparator 21, a unidirectional conduction device 22 and a voltage regulating circuit 23; the input end of the voltage comparator 21 is connected with the power supply voltage input end 1, and the output end thereof is sequentially connected with the unidirectional conduction device 22, the voltage regulating circuit 23 and the monitoring voltage acquisition pin 31 of the PFC module 3.
The PFC output control module 2 is configured to control the voltage value output to the PFC module according to the input voltage segment.
The working principle of the active power factor correction circuit in this embodiment is as follows: detecting an ac input voltage by the voltage comparator; when the input voltage is larger than a preset value, the voltage comparator controls the one-way conduction device to conduct; the one-way and one-way conduction device is conducted to enable a voltage regulating circuit connected with the one-way and one-way conduction device to form a parallel connection relationship with a monitoring voltage acquisition pin of the PFC module, and the resistance acquired by the PFC module through the monitoring voltage acquisition pin is reduced to output a first voltage value; when the input voltage is smaller than a preset value, the voltage comparator controls the unidirectional conduction device to be non-conductive; the one-way switch-on device is turned off to enable the voltage regulating circuit connected with the one-way switch-on device to be invalid (equivalent to an open circuit), so that the resistance acquired by the PFC module through the monitoring voltage acquisition pin of the PFC module is larger than the resistance acquired before, and a second voltage value smaller than the first voltage value is output.
The embodiment realizes accurate control of PFC segmented output voltage through the voltage comparator. When the input of the full alternating voltage is reduced, the aim of improving the working efficiency of the system is achieved by reducing the output voltage of the PFC module. Particularly, compared with the mode of controlling output voltage change by using a triode in the prior art, the embodiment can effectively solve the problem of poor consistency of output voltage of a segmentation point caused by difference of amplification factors of the triode and the problem of low efficiency caused by temperature rise in the work of an alternating-current low-voltage input power supply.
It will be appreciated that the PFC output voltage setting in a full voltage input design is typically between 380VDC and 400 VDC. The higher the output voltage, the higher the efficiency in terms of PFC stage energy storage. However, a higher output voltage means a larger switching loss of the PFC stage, especially under light load conditions. That is, reducing the output voltage of the PFC stage may increase overall system efficiency. The PFC stage efficiency under the light load condition can be improved by reducing the capacitive switching loss; meanwhile, the PFC stage efficiency under the low line voltage condition can be improved by reducing the voltage conversion ratio, because the conduction loss of the boost switch is increased when the voltage conversion ratio (Vo/Vin) is large. Therefore, the PFC output voltage is controlled to carry out two-stage output according to the input voltage, and the work efficiency is improved.
In some specific implementations of this embodiment, the unidirectional conducting device is configured to isolate an OUT pin of the voltage comparator from an output voltage control. Optionally, the unidirectional conduction device may be a diode, a thyristor, a transistor or the like with unidirectional conduction function. Preferably a diode. The negative electrode of the diode is connected with the V OUT pin of the voltage comparator, and the positive electrode of the diode is connected with the voltage regulating circuit.
In some implementations of this embodiment, the voltage regulating circuit may be comprised of a first resistor and a second resistor connected in parallel. One end of the first resistor and one end of the second resistor which are connected in parallel are connected with the output end of the unidirectional conduction device, namely the positive electrode of the diode; the other end is connected with a monitoring voltage acquisition pin of the PFC module.
In still other implementations of this embodiment, the voltage regulating circuit may be composed of only the third resistor; one end of the third resistor is connected with the output end of the unidirectional conduction device, namely the positive electrode of the diode; the other end is connected with a monitoring voltage acquisition pin of the PFC module.
The voltage regulating circuit is composed of two resistors connected in parallel, and has higher flexibility in performing voltage regulation than if the circuit is composed of only one resistor.
In some implementations of the present embodiment, as shown in fig. 3, the voltage comparator 21 specifically includes an operational amplifier OP1, an operational amplifier OP2, a fourth resistor, and a fifth resistor; the output end of the operational amplifier OP1 is connected with the output end of the operational amplifier OP2 to serve as the output end of the voltage comparator, namely a V OUT pin; the positive input end of the operational amplifier OP1 is connected with the positive input end of the operational amplifier OP2 through the fourth resistor, and the positive input end of the operational amplifier OP2 is connected with the fifth resistor and then used as an I CTRL pin of the voltage comparator; the negative input end of the operational amplifier OP2 is used as a v SENSE pin of the voltage comparator; the negative input of the operational amplifier OP1 is referenced as v CTRL of the voltage comparator. Here, by employing a high input impedance voltage comparator, more precise control of the output voltage division point can be achieved.
In some implementations of this embodiment, the PFC output voltage setting is typically between 380VDC and 400VDC in a full voltage input design. Therefore, the preset value for judging the input voltage in the voltage comparator of the PFC output control module is preferably set to 150VDC. When the input voltage is more than 150VDC, the PFC output control module controls the output voltage to be 390VDC; the PFC output control module controls the output voltage to 230VDC when the input voltage is < 150VDC. In particular, by the latter control, the product efficiency at the time of low voltage input can be maximized while EMC is easier to handle.
As shown in fig. 4, in an alternative implementation manner of this embodiment, the PFC output control module 2 includes a voltage comparator U1, a diode D16, a voltage regulating circuit, a resistor R19, and a sampling circuit.
The IN2 sampling pin, i.e. pin 1, of the voltage comparator U1 is connected to the sampling circuit, and the sampling circuit is connected to the power supply voltage input end, and is used for collecting an ac input voltage value. Preferably, the sampling circuit comprises diodes D7, D8, a resistor R9, a resistor R15, a resistor R30, a resistor R37 and a capacitor C24; the power supply voltage input end is connected with the anodes of the diodes D7 and D8; the cathodes of the diodes D7, D8 are connected to one end of the resistor R15 via the resistor R9; the other end of the resistor R15 is connected with the input end of the voltage comparator; after the resistor R30, the resistor R37 and the capacitor C24 are connected in parallel, one end of the resistor R30 is connected between the resistor R15 and the input end of the voltage comparator, and the other end of the resistor R37 is grounded. Preferably, the power supply voltage input end is connected to the sampling circuit after rectifying and filtering treatment so as to improve stability and accuracy of the collected input voltage.
The V OUT pin of the voltage comparator U1, namely the No. 5 pin, is connected with the cathode of the diode D16; the positive electrode of the diode D16 is connected with a voltage comparator; the voltage comparator comprises a resistor R24 and a resistor R93 which are connected in parallel; one end of the resistor R24 and one end of the resistor R93 are respectively connected with the anode of the diode D16, and the other ends of the resistor R24 and the resistor R93 are respectively connected with a monitoring voltage acquisition pin of the PFC module.
The pin I CTRL of the voltage comparator U1, i.e., pin No. 4, is connected to the cathode of the diode D16 through the resistor R19, which may also be understood as being connected to the output terminal of the voltage comparator. And the resistor R19 is used for feeding back voltage output, so that the output voltage of the PFC output control module is more stable.
The v VCC pin, namely the No. 6 pin, of the voltage comparator U1 is connected with a power supply circuit; one end of the power supply circuit is connected with the power VCC end, and the other end of the power supply circuit is connected with a v VCC pin of U1. Preferably, the power supply circuit comprises a resistor R31, a capacitor C16 and a zener diode D17; one end of the capacitor C16 is grounded, and the other end of the capacitor C16 is connected to a v VCC pin of U1; the negative electrode and the control electrode of the voltage stabilizing diode D17 are connected, and are respectively connected with the v VCC pin of U1 and one end of the resistor R31, and the other end of the resistor R31 is connected with the power VCC end.
In this alternative embodiment, the PFC module includes a PFC controller U3, a fourth resistor (i.e., resistor R23 in fig. 4), and a fifth resistor; the monitoring voltage acquisition pin of the PFC controller U3, namely a No. 6 pin, is divided into two paths, one path is grounded through the fourth resistor, and the other path is connected to the power BUS through the fifth resistor. Preferably, the fifth resistor is formed by connecting two resistors in series, corresponding to the resistor R41 and the resistor R40 connected in series in fig. 4.
In the above alternative specific embodiment, the voltage comparator is used to detect the ac input voltage, when the input voltage is detected to be greater than 150VAC, the 5 th pin of the voltage comparator U1 outputs a low level, the diode D16 is turned on, at this time, the resistor R23 of the PFC module, the resistors R93 and R24 in the PFC output control module and the diode D16 are in a parallel relationship, the resistor collected by the 6 th pin of the PFC controller U3 in the PFC module is reduced, and the voltage output through the 6 th pin of the voltage comparator is 390VDC; when the input voltage <150VAC is detected, the 5 th pin of the voltage comparator U1 outputs a high level, the diode D16 is turned off, at the moment, the resistor R23 of the PFC module, the resistor R93 in the FC output control module, the resistor R24 and the diode D16 are changed from parallel connection into only R23, which is equivalent to open circuit, and the output voltage of the PFC controller U3 in the PFC module is 230VDC. Two-stage output is carried out by accurately controlling PFC output voltage, and low-voltage input working efficiency is improved.
The active power factor correction circuit described in this embodiment adopts an active pfc+flyback topology design. Optionally, the voltage comparator U1 is of the type UM610A; the PFC module is An Senmei NCP1654 chip, and the rated input voltage range of the product is: 100-240VAC, rated output voltage 32V, rated output current 4.7A, maximum output current 12A.
Referring to fig. 5, fig. 5 is a schematic diagram illustrating an overall structure of an active power factor correction circuit according to an embodiment of the present utility model. As shown in fig. 5, an embodiment of the present utility model provides an active power factor correction circuit, which includes a power supply voltage input end (corresponding to CON1 in the figure), an EMI filter module 4, a rectifying filter module 5, a PFC output control module 2 and a PFC module 3.
The power supply voltage input end, the EMI filtering module 4, the rectifying and filtering module 5 and the PFC module 3 are sequentially connected; the PFC output control module 2 is respectively connected with the rectifying and filtering module 5 and the PFC module 3.
Specifically, the input end of the PFC output control module 2 is connected to the output end of the rectifying and filtering module 5, and the output end is connected to the monitor voltage acquisition pin VSENSE of the PFC module 3.
In the embodiment, the power supply voltage input is preprocessed through the EMI filtering module 4 and the rectifying and filtering module 5, so that the stability and the accuracy of the input voltage are improved; the PFC output control module 2 is used for accurately controlling the segmented output voltage, so that the working efficiency of low-voltage input is improved. Compared with the prior art adopting the triode output voltage control mode, the method can effectively solve the problem of poor consistency of the output voltage of the segmentation point caused by the difference of the amplification factors of the triode, and can also solve the problem of low efficiency caused by the temperature rise in the work of the alternating current low-voltage input power supply.
The utility model also provides a switching power supply, which comprises the active power factor correction circuit in any embodiment.
According to the switching power supply, the PFC output control module is used for accurately controlling the segmented output voltage, so that the working efficiency of low-voltage input is improved; meanwhile, the EMC of the product can be improved, and further the reliability of the product is improved.
The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent changes made by the specification and drawings of the present utility model, or direct or indirect application in the relevant art, are included in the scope of the present utility model.
Claims (10)
1. The active power factor correction circuit is characterized by comprising a power supply voltage input end, a PFC output control module and a PFC module which are connected in sequence;
The PFC output control module comprises a voltage comparator, a unidirectional conduction device and a voltage regulating circuit; the input end of the voltage comparator is connected with the power supply voltage input end, and the output end of the voltage comparator is connected to a monitoring voltage acquisition pin of the PFC module through the unidirectional conduction device and the voltage regulating circuit in sequence;
The PFC output control module is used for controlling the voltage value output to the PFC module according to the input voltage section.
2. The active power factor correction circuit of claim 1, wherein the unidirectional-on device is a diode, a thyristor, or a transistor.
3. The active power factor correction circuit of claim 1, wherein the voltage regulation circuit comprises a first resistor and a second resistor connected in parallel; one end of the first resistor and one end of the second resistor which are connected in parallel are connected with the output end of the unidirectional conduction device, and the other end of the first resistor and one end of the second resistor are connected with the monitoring voltage acquisition pin.
4. The active power factor correction circuit of claim 1, wherein the voltage regulation circuit comprises a third resistor; one end of the third resistor is connected with the output end of the unidirectional conduction device, and the other end of the third resistor is connected with the monitoring voltage acquisition pin.
5. The active power factor correction circuit of claim 1, wherein the voltage comparator comprises an operational amplifier OP1, an operational amplifier OP2, a fourth resistor, and a fifth resistor; the output end of the operational amplifier OP1 is connected with the output end of the operational amplifier OP2 and is used as the output end of the voltage comparator; the positive input end of the operational amplifier OP1 is connected with the positive input end of the operational amplifier OP2 through the fourth resistor, and the positive input end of the operational amplifier OP2 is connected with the fifth resistor and then used as an I CTRL pin of the voltage comparator; the negative input end of the operational amplifier OP2 serves as a v SENSE pin of the voltage comparator.
6. The active power factor correction circuit as claimed in claim 5, wherein said PFC output control module further comprises a resistor R19; the output end of the voltage comparator is also connected to the I CTRL pin through the resistor R19.
7. The active power factor correction circuit as claimed in claim 1, wherein said PFC output control module further comprises a sampling circuit; the input end of the voltage comparator is connected to the power supply voltage input end through the sampling circuit.
8. The active power factor correction circuit of claim 7, wherein the sampling circuit comprises a diode D7, a diode D8, a resistor R9, a resistor R15, a resistor R30, a resistor R37, and a capacitor C24; the power supply voltage input end is respectively connected with the anodes of the diode D7 and the diode D8; the cathodes of the diode D7 and the diode D8 are connected to one end of the resistor R15 via the resistor R9; the other end of the resistor R15 is connected with the input end of the voltage comparator; after the resistor R30, the resistor R37 and the capacitor C24 are connected in parallel, one end of the resistor R30 is connected between the resistor R15 and the input end of the voltage comparator, and the other end of the resistor R37 is grounded.
9. The active power factor correction circuit of claim 1, wherein the PFC module comprises a PFC controller, a fourth resistor, and a fifth resistor; the monitoring voltage acquisition pin of the PFC controller is divided into two paths, one path is grounded through the fourth resistor, and the other path is connected to the power BUS through the fifth resistor.
10. A switching power supply comprising an active power factor correction circuit as claimed in any one of claims 1 to 9;
The active power factor correction circuit further includes: an EMI filtering module and a rectifying and filtering module;
the power supply voltage input end is connected to the PFC output control module through the EMI filtering module; and the EMI filtering module is also connected with the rectifying and filtering module and the PFC module in sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322591046.2U CN220874421U (en) | 2023-09-22 | 2023-09-22 | Active power factor correction circuit and switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322591046.2U CN220874421U (en) | 2023-09-22 | 2023-09-22 | Active power factor correction circuit and switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220874421U true CN220874421U (en) | 2024-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322591046.2U Active CN220874421U (en) | 2023-09-22 | 2023-09-22 | Active power factor correction circuit and switching power supply |
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| CN (1) | CN220874421U (en) |
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2023
- 2023-09-22 CN CN202322591046.2U patent/CN220874421U/en active Active
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