CN105656292B - A kind of circuit of PFC voltage follows output voltage fine setting - Google Patents
A kind of circuit of PFC voltage follows output voltage fine setting Download PDFInfo
- Publication number
- CN105656292B CN105656292B CN201610170737.7A CN201610170737A CN105656292B CN 105656292 B CN105656292 B CN 105656292B CN 201610170737 A CN201610170737 A CN 201610170737A CN 105656292 B CN105656292 B CN 105656292B
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- resistance
- circuit
- pressure regulation
- output voltage
- pfc
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Classifications
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- 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
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
Abstract
The invention discloses a kind of circuit of PFC voltage follows output voltage fine setting, including pressure regulation signal processing circuit and pressure regulation signal isolation drive circuit, after the pressure regulation order of outside is obtained, pressure regulation signal processing circuit is handled external signal, it is divided into two paths of signals after processing, signal gives output voltage feedback circuit all the way, output voltage is reached preset value；Another way signal gives pressure regulation signal isolation drive circuit, and secondary pressure regulation signal is delivered to primary PFC voltage control circuits by the circuit, realizes that PFC voltage follows output voltage is finely tuned.The present invention can make the output voltage adjustable application range bigger of power supply, when improving output voltage range adjusting to off-target operating point, the problem of power source performance reduces, because performance improvement, the cost increase brought because of increase cooling measure, using high performance device etc. can be reduced, has saved Material Cost, it is easier to realize the performance indicator of requirement, debugging difficulty is reduced, shortens the construction cycle of power supply.
Description
Technical field
The present invention relates to the circuit of Switching Power Supply PFC voltage follows output voltage fine setting.
Background technology
At present, it is required for requiring the output voltage of power supply to adjust on a large scale under many circumstances, and requires defeated
Go out and ensure property indices in voltage regulation limits.
The PFC voltages of general Switching Power Supply are fixed, are limited by transformer turns ratio, a transformer can only often fit
With the output voltage range of a very little, super to go beyond the scope, the performance of power supply, which will occur, to be decreased obviously, and the scope exceeded is got over
Greatly, hydraulic performance decline is more obvious, such as efficiency reduction, device temperature increase, output ripple increase etc., to solve the problems, such as these,
Generally require increase heat dissipation design, increase filter circuit, using measures such as high performance devices, cause device cost increase, power supply
Debugging difficulty is big and construction cycle length, the actual adjustable extent of power supply are restricted, as shown in Figure 1 and Figure 2.
The content of the invention
In order to overcome above-mentioned technological deficiency, the present invention provides a kind of circuit of PFC voltage follows output voltage fine setting, should
The circuit of PFC voltage follows output voltage fine setting can improve the output voltage adjustable extent of power supply, improve output voltage and adjust
Performance during to off-target operating point, can save Material Cost, reduce the construction cycle.
The technical solution adopted by the present invention to solve the technical problems is as described below：A kind of PFC voltage follows output voltage
The circuit of fine setting, it is characterised in that including pressure regulation signal processing circuit and pressure regulation signal isolation drive circuit,
After the pressure regulation order of outside is obtained, pressure regulation signal processing circuit is handled external signal, is divided into after processing
Two paths of signals, all the way signal give output voltage feedback circuit, output voltage is reached preset value；Another way signal gives pressure regulation signal
Secondary pressure regulation signal, primary PFC voltage control circuits are delivered to by the circuit by isolated drive circuit, realize PFC voltages with
Finely tuned with output voltage.
According to the above-mentioned present invention, wherein the pressure regulation signal processing circuit is MCU or discrete device.
According to the above-mentioned present invention, wherein the pressure regulation signal isolation drive circuit is optocoupler or driving transformer.
According to the above-mentioned present invention, wherein PFC input terminals are successively by first resistor R1, second resistance R2,3rd resistor
R3 is connected with the 4th resistance R4, and the 4th resistance R4 is grounded by the 5th resistance R5, and the 5th resistance R5 is respectively with the 6th
Resistance R6 and the first capacitance C1 is in parallel, and the 4th resistance R4 is also connected with PFC control chips and the pressure regulation signal-isolated transmission
Circuit, the pressure regulation signal-isolated transmission circuit other end connect the pressure regulation signal processing circuit, the pressure regulation signal processing
Inverting input of the circuit Jing Guo the tenth resistance R10 connection first comparators, the inverting input of the first comparator also pass through
The 3rd capacitance C3 and the output terminal of the 8th resistance R8 connections first comparator are crossed, the output terminal of the first comparator also passes through
Cross the anode of the 7th resistance R7 and the first light emitting diode, the minus earth of the light emitting diode, the first comparator
Power pins connect power vd D, and the power pins are also grounded by the second capacitance C2, the homophase input of the first comparator
End connects the 11st resistance R11 and the 12nd resistance R12, the 11st resistance R11 connections electricity respectively by the 9th resistance R9
Output terminal is pressed, the 12nd resistance R12 is in parallel with the 13rd resistance R13.
According to the above-mentioned present invention, in the pressure regulation signal-isolated transmission circuit, the both ends difference of the 14th resistance R14
The output terminal of the PFC control chips and second voltage comparator is connected, which is also connected with the second voltage comparator
Inverting input, hair of the in-phase input end of the second voltage comparator through the 15th resistance R15 connection phototriodes
Emitter-base bandgap grading, the collector connection 5V power supplys of the phototriode, the base stage of the phototriode are controlled by the second light-emitting diodes
Pipe, the anode of second light emitting diode is through the 16th resistance R16 connections power vd D, second light emitting diode
Cathode connect the second triode collector, second triode emitter ground connection, the base stage of second triode
Its emitter is connected through the 18th resistance R18, the base stage of second triode also passes through the 17th resistance R17 connections tune
Press signal processing circuit.
According to the present invention of said structure, its advantage is：
1st, the output voltage adjustable application range bigger of power supply.
2nd, improve output voltage range adjust to off-target operating point when, power source performance reduce the problem of.
3rd, because performance improvement, it is possible to reduce the cost increase brought because of increase cooling measure, using high performance device etc.,
Material Cost is saved.
4th, because performance improvement, it is easier to realize the performance indicator of requirement, reduce debugging difficulty, shorten the exploitation of power supply
Cycle.
Brief description of the drawings
Fig. 1 is the circuit diagram of software adjustment output voltage in the prior art；
Fig. 2 is the circuit diagram that potentiometer adjusts output voltage in the prior art；
Fig. 3 is circuit structure diagram of the present invention；
Fig. 4 is that a kind of practical application of circuit of the present invention is illustrated.
Embodiment
Below in conjunction with the accompanying drawings and embodiment the present invention is described further.
As shown in Figure 3, Figure 4, a kind of circuit of PFC voltage follows output voltage fine setting, including pressure regulation signal processing circuit
With pressure regulation signal isolation drive circuit.
PFC input terminals are connected by first resistor R1, second resistance R2,3rd resistor R3 with the 4th resistance R4 successively, the
Four resistance R4 are grounded by the 5th resistance R5, and the 5th resistance R5 is in parallel with the 6th resistance R6 and the first capacitance C1 respectively, the 4th electricity
Resistance R4 is also connected with PFC control chips and pressure regulation signal-isolated transmission circuit, and the connection of the pressure regulation signal-isolated transmission circuit other end is adjusted
Pressure signal processing circuit, inverting input of the pressure regulation signal processing circuit Jing Guo the tenth resistance R10 connection first comparators, first
Also by the 3rd capacitance C3 and the output terminal of the 8th resistance R8 connection first comparators, first compares the inverting input of comparator
The output terminal of device is also by the 7th resistance R7 and the anode of the first light emitting diode, the minus earth of light emitting diode, the first ratio
Power pins compared with device connect power vd D, and power pins are also grounded by the second capacitance C2, the in-phase input end of first comparator
The 11st resistance R11 and the 12nd resistance R12, the 11st resistance R11 connection voltage outputs are connected respectively by the 9th resistance R9
End, the 12nd resistance R12 are in parallel with the 13rd resistance R13.
In pressure regulation signal-isolated transmission circuit, the both ends of the 14th resistance R14 connect PFC control chips and second respectively
The output terminal of voltage comparator, the output terminal are also connected with the inverting input of second voltage comparator, second voltage comparator
Emitter of the in-phase input end through the 15th resistance R15 connection phototriodes, the collector connection 5V power supplys of phototriode,
The base stage of phototriode is controlled by the second light emitting diode, and the anode of the second light emitting diode is through the 16th resistance R16 connections
Power vd D, the cathode of the second light emitting diode connect the collector of the second triode, and the emitter of the second triode is grounded, the
The base stage of two triodes connects its emitter through the 18th resistance R18, and the base stage of the second triode also passes through the 17th resistance R17
Connect pressure regulation signal processing circuit.
After the pressure regulation order of outside is obtained, pressure regulation signal processing circuit is handled external signal, is divided into after processing
Two paths of signals, all the way signal give output voltage feedback circuit, output voltage is reached preset value；Another way signal gives pressure regulation signal
Secondary pressure regulation signal, primary PFC voltage control circuits are delivered to by the circuit by isolated drive circuit, realize PFC voltages with
Finely tuned with output voltage.
In this example, pressure regulation signal processing circuit has diversified forms, can be realized with MCU, can also be real with discrete device
It is existing.Pressure regulation signal-isolated transmission circuit can be transmitted with driving transformer can also be isolated with light-coupled isolation and transmitted.
The present invention improves the output voltage adjustable extent of power supply, improves output voltage and adjusts to off-target operating point
When performance, saved Material Cost, reduced the construction cycle.
It should be appreciated that for those of ordinary skills, can according to the above description be improved or converted,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Exemplary description has been carried out to patent of the present invention above in conjunction with attached drawing, it is clear that the realization of patent of the present invention and from
The limitation of aforesaid way, if the various improvement that the methodology of patent of the present invention and technical solution carry out are employed, or without
Improve and the design of patent of the present invention and technical solution are directly applied into other occasions, within the scope of the present invention.
Claims (6)
1. a kind of circuit of PFC voltage follows output voltage fine setting, it is characterised in that including pressure regulation signal processing circuit and pressure regulation
Signal-isolated transmission circuit, after the pressure regulation order of outside is obtained, pressure regulation signal processing circuit is handled external signal, place
It is divided into two paths of signals after reason, signal gives output voltage feedback circuit all the way, output voltage is reached preset value；Another way signal is given
Secondary pressure regulation signal, is delivered to primary PFC voltage control circuits by the circuit, realized by pressure regulation signal-isolated transmission circuit
PFC voltage follows output voltage is finely tuned；
PFC input terminals are connected by first resistor R1, second resistance R2,3rd resistor R3 with the 4th resistance R4 successively, and described the
Four resistance R4 are grounded by the 5th resistance R5, and the 5th resistance R5 is in parallel with the 6th resistance R6 and the first capacitance C1 respectively, institute
State the 4th resistance R4 and be also connected with PFC control chips and the pressure regulation signal-isolated transmission circuit, the pressure regulation signal-isolated transmission
The circuit other end connects the pressure regulation signal processing circuit, and the pressure regulation signal processing circuit is by the tenth resistance R10 connections the
The inverting input of one comparator, the inverting input of the first comparator also connect by the 3rd capacitance C3 and the 8th resistance R8
The output terminal of the first comparator is connect, the output terminal of the first comparator also passes through the 7th resistance R7 and the first light-emitting diodes
The anode of pipe, the minus earth of the light emitting diode, the power pins connection power vd D of the first comparator, the electricity
Source pin is also grounded by the second capacitance C2, and the in-phase input end of the first comparator connects the respectively by the 9th resistance R9
11 resistance R11 and the 12nd resistance R12, the 11st resistance R11 connection voltage output ends, the 12nd resistance R12
It is in parallel with the 13rd resistance R13.
A kind of 2. circuit of PFC voltage follows output voltage fine setting according to claim 1, it is characterised in that the tune
Pressure signal processing circuit is MCU.
A kind of 3. circuit of PFC voltage follows output voltage fine setting according to claim 1, it is characterised in that the tune
Pressure signal processing circuit is discrete device.
A kind of 4. circuit of PFC voltage follows output voltage fine setting according to claim 1, it is characterised in that the tune
It is optocoupler to press signal-isolated transmission circuit.
A kind of 5. circuit of PFC voltage follows output voltage fine setting according to claim 1, it is characterised in that the tune
It is driving transformer to press signal-isolated transmission circuit.
6. the circuit of a kind of PFC voltage follows output voltage fine setting according to claim 1, it is characterised in that described
In pressure regulation signal-isolated transmission circuit, the both ends of the 14th resistance R14 connect the PFC control chips and second voltage ratio respectively
Compared with the output terminal of device, which is also connected with the inverting input of the second voltage comparator, the second voltage comparator
Emitter of the in-phase input end through the 15th resistance R15 connection phototriodes, the phototriode collector connection
5V power supplys, the base stage of the phototriode are controlled by the second light emitting diode, and the anode of second light emitting diode is through
The 16 resistance R16 connections power vd D, the cathode of second light emitting diode connect the collector of the second triode, institute
The emitter ground connection of the second triode is stated, the base stage of second triode connects its emitter through the 18th resistance R18, described
The base stage of second triode also passes through the 17th resistance R17 connections pressure regulation signal processing circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610170737.7A CN105656292B (en) | 2016-03-24 | 2016-03-24 | A kind of circuit of PFC voltage follows output voltage fine setting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610170737.7A CN105656292B (en) | 2016-03-24 | 2016-03-24 | A kind of circuit of PFC voltage follows output voltage fine setting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105656292A CN105656292A (en) | 2016-06-08 |
| CN105656292B true CN105656292B (en) | 2018-05-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610170737.7A Active CN105656292B (en) | 2016-03-24 | 2016-03-24 | A kind of circuit of PFC voltage follows output voltage fine setting |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2596657Y (en) * | 2002-12-31 | 2003-12-31 | 上海新源变频电器股份有限公司 | Variable central air conditioner power factor correcting circuit device |
| US6967851B2 (en) * | 2003-12-15 | 2005-11-22 | System General Corp. | Apparatus for reducing the power consumption of a PFC-PWM power converter |
| CN2713725Y (en) * | 2004-05-28 | 2005-07-27 | 上海新源变频电器股份有限公司 | Frequency conversion air-conditioner single tube total control bridge power coefficient corrector |
| CN201422183Y (en) * | 2009-05-26 | 2010-03-10 | 郑州光华灯具有限公司 | High-power LED lamp drive device |
| CN202475284U (en) * | 2012-02-29 | 2012-10-03 | 珠海市绿色照明科技有限公司 | Low-power high-power factor power supply |
| CN202565520U (en) * | 2012-03-14 | 2012-11-28 | 深圳市海骏电子科技有限公司 | LED dimming driver and LED light source system |
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2016
- 2016-03-24 CN CN201610170737.7A patent/CN105656292B/en active Active
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| CN105656292A (en) | 2016-06-08 |
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Address after: 518000 Shenzhen City, Shenzhen, Guangdong, Nanshan District Taoyuan street, No. 1268, honghualing industrial North District, 1, 2 4 floors, West, 5, 6. Applicant after: Shenzhen holdluck-zyt supply technology Limited by Share Ltd Address before: 518000 Shenzhen City, Shenzhen, Guangdong, Nanshan District Taoyuan street, No. 1268, honghualing industrial North District, 1, 2 4 floors, West, 5, 6. Applicant before: ShenZhen VAPEL Power Supply Technology Co., Ltd. |
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Address after: 518116 Shenzhen, Longgang, Guangdong Longgang District, Baolong Industrial Zone, Longgang Road, three road 4, A Building 1, 2 floor B building 3, 4 floor C building 3, 4 Building D Applicant after: Shenzhen holdluck-zyt supply technology Limited by Share Ltd Address before: 518000 Shenzhen City, Shenzhen, Guangdong, Nanshan District Taoyuan street, No. 1268, honghualing industrial North District, 1, 2 4 floors, West, 5, 6. Applicant before: Shenzhen holdluck-zyt supply technology Limited by Share Ltd |
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