CN110972361A - APFC switching power supply - Google Patents
APFC switching power supply Download PDFInfo
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- CN110972361A CN110972361A CN201911155350.4A CN201911155350A CN110972361A CN 110972361 A CN110972361 A CN 110972361A CN 201911155350 A CN201911155350 A CN 201911155350A CN 110972361 A CN110972361 A CN 110972361A
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Abstract
The embodiment of the invention discloses an APFC (active power factor controller) switching power supply, which comprises a voltage conversion module, a power conversion module and an output rectification module, wherein the power conversion module is respectively connected with the voltage conversion module and the output rectification module, and the power conversion module is a field effect transistor arranged in a boosting chip and used for boosting input voltage and sending the boosted voltage value to the power conversion module; the power conversion module is used for processing the boosted voltage value through the power conversion circuit to obtain output current; and the output rectifying module is used for rectifying the output current and then providing current for the lamp load. Therefore, compared with the prior art, the embodiment of the invention realizes high PF value, realizes no stroboflash through input and output electrolysis, realizes free power by utilizing the input built-in MOS APFC IC and the flyback external MOS, is more stable and reliable than the flyback built-in MOS, and has low cost and small size of the switching power supply.
Description
Technical Field
The invention relates to the technical field of circuit control, in particular to an APFC switching power supply.
Background
At present, energy conservation and environmental protection become social focus issues in the increasingly serious problems of energy crisis and climate warming, and the LED has received wide attention from people due to the advantages of high efficiency, energy conservation, environmental protection, long service life, rich color, small volume, flicker resistance, high reliability, convenient regulation and control and the like.
Although the conventional LED power supply can light an LED lamp, the harmonic is relatively large, and in order to enable the input current harmonic of the LED driving power supply to meet the requirement, the power factor needs to be corrected.
The scheme of providing APFC with flyback in the prior art specifically is as follows: one is that two external MOS are combined, which results in larger power size and higher cost; the other is an integrated APFC and flyback integrated chip, which results in high integrated chip cost, large power supply size and high power supply production and maintenance cost.
Disclosure of Invention
In view of the above technical problem, an embodiment of the present invention provides an APFC switching power supply, including: the power conversion module is a field effect transistor arranged in a boosting chip and used for boosting input voltage and sending the boosted voltage value to the power conversion module;
the power conversion module is used for processing the boosted voltage value through the power conversion circuit to obtain output current;
and the output rectifying module is used for rectifying the output current and then providing current for the lamp load.
Optionally, the switching power supply further includes an anti-electromagnetic interference module, an output end of the anti-electromagnetic interference module is connected to an input end of the bridge rectifier module, an output end of the bridge rectifier module is connected to an input end of the voltage conversion module, the anti-electromagnetic interference module at least includes an EMI element, and the EMI element is an i-shaped inductor formed after the flat coil and the bridge stack are stacked.
Optionally, the i-shaped inductor is formed by adding a bridge stack on the basis of the magnetic loop inductor T9 × 5 × 3 and the inductor EE 8.3.
Optionally, the switching power supply further includes a circuit protection module, an output end of the circuit protection module is connected to an input end of the anti-electromagnetic interference module, the circuit protection module at least includes a protection element, the protection element includes a fuse and/or a voltage-sensitive diode, and the protection element is an element of a patch.
Optionally, the power conversion module includes a constant current conversion module or a constant voltage conversion module, where the constant current conversion module includes at least an MT7950 chip, and the constant voltage conversion module includes at least an SFL671 chip.
Optionally, the voltage conversion module at least includes an APFC chip, the switching power supply further includes a boost output voltage feedback module, and the boost output voltage feedback module is: and the power supply end of the APFC is connected with an electrolytic capacitor, the voltage of the power supply end is sampled through a resistor, and the adopted voltage value is compared with the voltage value of the feedback end.
Optionally, the switching power supply further includes a rectified output voltage feedback module, where the rectified output voltage feedback module at least includes an output transformer, determines an output voltage value according to a turn ratio of the output transformer and a voltage value after the voltage conversion module boosts, and compares the output voltage value with a feedback end in the constant current conversion module or the constant voltage conversion module.
Optionally, the APFC chip is a SY58873 chip, and a MOS element is integrated in the SY58873 chip.
Optionally, the output rectifying module includes an output diode and an output electrolytic capacitor, wherein an output end of the power conversion module is connected to an anode of the output diode, and a cathode of the output diode is connected to an anode of the output electrolytic capacitor.
Optionally, the output diode is a patch element.
In the technical scheme provided by the embodiment of the invention, an APFC switching power supply is provided, which comprises a voltage conversion module, a power conversion module and an output rectification module, wherein the power conversion module is respectively connected with the voltage conversion module and the output rectification module, the power conversion module is a field effect transistor arranged in a boost chip and used for boosting input voltage and sending the boosted voltage value to the power conversion module; the power conversion module is used for processing the boosted voltage value through the power conversion circuit to obtain output current; and the output rectifying module is used for rectifying the output current and then providing current for the lamp load. Therefore, compared with the prior art, the embodiment of the invention realizes high PF value, the output is realized through electrolysis without stroboflash, the cost is low, and the size of the switching power supply is small.
Drawings
Fig. 1 is a schematic structural diagram of an APFC switching power supply according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of an APFC switching power supply according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of an APFC switching power supply according to another embodiment of the present invention;
fig. 4 is a schematic diagram of a frame structure of an APFC switching power supply according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.
Referring to fig. 1, an embodiment of the invention provides an APFC switching power supply, including: the power conversion module 20 is a field effect transistor built in a boost chip and is used for boosting input voltage and sending the boosted voltage value to the power conversion module 20;
the power conversion module 20 is configured to process the boosted voltage value through a power conversion circuit to obtain an output current;
the output rectifying module 30 is configured to rectify the output current and provide the current for the lamp load.
Specifically, the APFC switching power supply provided by the embodiment of the present invention includes a voltage conversion module 10, a power conversion module 20, and an output rectification module 30, where the voltage conversion module 10 is specifically an APFC chip with a built-in MOS, boosts an input voltage, sends the boosted voltage value to the power conversion module 20, processes the boosted voltage value through the power conversion module 20 to generate a stable output current, and provides a current for a lamp load through the output rectification module 30, so that a high PF (power factor) value is achieved without stroboflash, the size of a switching voltage is reduced, and the cost is reduced.
The APFC switch power supply provided by the embodiment of the invention comprises a voltage conversion module, a power conversion module and an output rectification module, wherein the power conversion module is respectively connected with the voltage conversion module and the output rectification module, and the power conversion module is a field effect transistor arranged in a boost chip and used for boosting input voltage and sending the boosted voltage value to the power conversion module; the power conversion module is used for processing the boosted voltage value through the power conversion circuit to obtain output current; and the output rectifying module is used for rectifying the output current and then providing current for the lamp load. Therefore, compared with the prior art, the embodiment of the invention realizes high PF value, the output is realized through electrolysis without stroboflash, the cost is low, and the size of the switching power supply is small.
Optionally, the switching power supply further includes an anti-electromagnetic interference module, an output end of the anti-electromagnetic interference module is connected to an input end of the bridge rectifier module, an output end of the bridge rectifier module is connected to an input end of the voltage conversion module, the anti-electromagnetic interference module at least includes an EMI element, and the EMI element is an i-shaped inductor formed after the flat coil and the bridge stack are stacked.
Particularly, the flat coil is used for realizing less EMI devices and reducing the size; EMI is realized through a freely combined IC, optimal temperature configuration is realized, more than 200MA can be added under the same condition of current realization, and low cost is realized.
In the embodiment of the invention, the input flat coil is used to realize the control within 1M of conduction, and the resonance of the magnetic ring inductor is utilized to effectively control the radiation within 300M, so that the UU inductor and the magnetic ring inductor are not used, and the cost is reduced.
Specifically, the I-shaped inductor has the characteristics of high power, high magnetic saturation, low impedance and small size. The I-shaped inductor has small volume, is convenient to install, belongs to a plug-in inductor and occupies small space; high Q factor; the distributed capacitance is small; the self-resonance frequency is higher; the special guide pin structure is not easy to generate a closed circuit phenomenon; protected with PVC or UL heat shrink tubing. The I-shaped inductor is generally formed by winding coils on an I-shaped magnetic core according to different parameter requirements, and two pins are led out.
Optionally, the switching power supply further includes: the circuit protection module, the output of circuit protection module is connected the input of anti-electromagnetic interference module, the circuit protection module includes the protection component at least, the protection component includes fuse and/or pressure sensitive diode, the protection component is the component of paster.
Specifically, the protection element may be a fuse or a voltage sensitive diode, and specific parameters may be set according to actual conditions, where the voltage sensitive diode may be an overvoltage device transient suppression diode, that is, a TVS tube.
Optionally, the power conversion module includes a constant current conversion module or a constant voltage conversion module, where the constant current conversion module includes at least an MT7950 chip, and the constant voltage conversion module includes at least an SFL671 chip.
Specifically, the power conversion module in the embodiment of the present invention includes a constant current conversion module or a constant voltage conversion module, and can realize constant voltage or constant current output through SY58873+ SFL671 and SY58873+ MT 7950.
Fig. 2 is a schematic circuit diagram of an APFC switching power supply according to an embodiment of the present invention, and as shown in fig. 2, an upper side U1 in the diagram is an APFC, and the APFC is a low-cost SY58873, so that external MOS and VCC windings are reduced, and a low-cost high PF value is achieved. The lower side U1 in the figure is SFL671 which realizes constant voltage or constant current output;
fig. 3 is a schematic circuit diagram of an APFC switching power supply according to another embodiment of the present invention, as shown in fig. 3, an upper side U1 in the diagram is APFC, the APFC is low-cost SY58873, external MOS and VCC windings are reduced, low-cost high PF values are realized, when a lower side U1 in the diagram is MT7950 (constant current driver), constant current output is realized, and the MT7950 is no COMP supplementary capacitor, so that the cost is reduced.
Optionally, the voltage conversion module at least includes an APFC chip, the switching power supply further includes a boost output voltage feedback module, and the boost output voltage feedback module is: and the power supply end of the APFC is connected with an electrolytic capacitor, the voltage of the power supply end is sampled through a resistor, and the adopted voltage value is compared with the voltage value of the feedback end.
Specifically, as shown in fig. 2 and 3, the feedback terminal FB of the upper side U1, the capacitors C1 and C2, the resistors R6, R3, R4, R5, and the electrolytic capacitor EC1, wherein the anode of the electrolytic capacitor EC1 is connected to the power supply terminal voltage VCC of the upper side U1, the power supply terminal voltage is sampled through the resistors R6, R3, R4, and R5, and the sampled voltage value is compared with the voltage value of the feedback terminal FB.
Optionally, the switching power supply further includes a rectified output voltage feedback module, where the rectified output voltage feedback module at least includes an output transformer, determines an output voltage value according to a turn ratio of the output transformer and a voltage value after the voltage conversion module boosts, and compares the output voltage value with a feedback end in the constant current conversion module or the constant voltage conversion module.
Optionally, the APFC chip is a SY58873 chip, and a MOS element is integrated in the SY58873 chip.
Specifically, in fig. 2 or fig. 3, the rectified output voltage feedback module includes an output transformer T1, an input terminal of the output transformer T1 is connected to the positive electrode of the EC1, the voltage across the EC1 is divided according to the number of turns of the output transformer, and the divided result is compared with the result at the feedback terminal 2 of the lower side U1.
Optionally, the output rectifying module includes an output diode and an output electrolytic capacitor, wherein an output end of the power conversion module is connected to an anode of the output diode, and a cathode of the output diode is connected to an anode of the output electrolytic capacitor.
Specifically, as shown in fig. 2 or fig. 3, the output diode is DS1, the output electrolytic capacitor is ESC1, and the cathode of the output diode DS1 is connected to the anode of the output electrolytic capacitor ESC 1.
Optionally, the output diode is a patch element.
Specifically, the embodiment of the invention uses the patch fuse and the patch output diode to reduce the cost, and reduces the manual insertion and the occupied PCB space.
Fig. 4 is a schematic diagram of a frame structure of an APFC switching power supply according to an embodiment of the present invention, as shown in fig. 4, specifically:
protection element: the protection element comprises a fuse and a pressure sensitive element, the circuit surge protection and the internal damage fuse of the power supply are fused, the AC device is protected, and the protection device is prevented from tripping.
An EMI component: the flat coil is added with the bridge and piled with the I-shaped inductor (the magnetic ring inductor T9 is added with 5 is added with 3+ EE8.3 is added with the bridge and piled with the I-shaped inductor).
APFC: namely the voltage conversion module, wherein APFC is a chip SY58873, in order to correct the power factor and improve the power factor;
power conversion: i.e., a power conversion module, including MT7950 constant current, or SFL671 constant voltage.
Output rectification: the output diode and the output electrolytic capacitor.
And (3) outputting: and connecting the lamps LED + and LED-.
APFC output voltage feedback, namely comparing the voltage sampling of the electrolytic capacitor after APFC with the IC feedback pin to output voltage by APFC.
Rectifying output voltage feedback: the output voltage is controlled by detecting the voltage on the VCC winding, comparing the voltage with the turn ratio through the feedback pin of the IC.
Has the advantages that:
and through mixed matching of APFC + flyback ICs, the optimal IC is searched, and low EMI cost is realized. And the flyback is realized by IC combination, so that the cost is low and the reliability is high. The size of the transformer is reduced, the same power can be realized, and meanwhile, the cost is effectively reduced.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. An APFC switching power supply, comprising: the power conversion module is a field effect transistor arranged in a boosting chip and used for boosting input voltage and sending the boosted voltage value to the power conversion module;
the power conversion module is used for processing the boosted voltage value through the power conversion circuit to obtain output current;
and the output rectifying module is used for rectifying the output current and then providing current for the lamp load.
2. The switching power supply according to claim 1, further comprising:
the anti-electromagnetic interference module, the input of bridge rectifier module is connected to anti-electromagnetic interference module's output, the output of bridge rectifier module is connected the input of voltage conversion module, anti-electromagnetic interference module includes the EMI component at least, the I-shaped inductance that the EMI component formed after flat coil adds the bridge stack.
3. The switching power supply as claimed in claim 2, wherein the i-shaped inductor is formed by adding a bridge stack on the basis of a magnetic loop inductor T9 x 5 x 3 and an inductor EE 8.3.
4. The switching power supply according to claim 2, further comprising: the circuit protection module, the output of circuit protection module is connected the input of anti-electromagnetic interference module, the circuit protection module includes the protection component at least, the protection component includes fuse and/or pressure sensitive diode, the protection component is the component of paster.
5. The switching power supply according to claim 1, wherein the power conversion module comprises a constant current conversion module or a constant voltage conversion module, wherein the constant current conversion module comprises at least an MT7950 chip, and the constant voltage conversion module comprises at least an SFL671 chip.
6. The switching power supply according to claim 1, wherein the voltage conversion module comprises at least an APFC chip, and the switching power supply further comprises a boost output voltage feedback module, and the boost output voltage feedback module is: and the power supply end of the APFC is connected with an electrolytic capacitor, the voltage of the power supply end is sampled through a resistor, and the adopted voltage value is compared with the voltage value of the feedback end.
7. The switching power supply according to claim 5, further comprising a rectified output voltage feedback module, wherein the rectified output voltage feedback module at least comprises an output transformer, an output voltage value is determined by a turn ratio of the output transformer and a boosted voltage value of the voltage conversion module, and the output voltage value is compared with a feedback end in the constant current conversion module or the constant voltage conversion module.
8. The switching power supply as claimed in claim 6, wherein the APFC chip is a SY58873 chip, and a MOS device is integrated in the SY58873 chip.
9. The switching power supply according to claim 1, wherein the output rectifying module comprises an output diode and an output electrolytic capacitor, wherein the output terminal of the power conversion module is connected to the anode of the output diode, and the cathode of the output diode is connected to the anode of the output electrolytic capacitor.
10. The switching power supply according to claim 9, wherein the output diode is a patch element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911155350.4A CN110972361A (en) | 2019-11-22 | 2019-11-22 | APFC switching power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911155350.4A CN110972361A (en) | 2019-11-22 | 2019-11-22 | APFC switching power supply |
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| CN110972361A true CN110972361A (en) | 2020-04-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112804794A (en) * | 2021-03-30 | 2021-05-14 | 广州市依歌智能科技有限公司 | Thing networking lighting control device and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112804794A (en) * | 2021-03-30 | 2021-05-14 | 广州市依歌智能科技有限公司 | Thing networking lighting control device and system |
| CN112804794B (en) * | 2021-03-30 | 2021-09-07 | 广州市依歌智能科技有限公司 | Thing networking lighting control device and system |
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