CN110518791A - A kind of PFC control circuit - Google Patents
A kind of PFC control circuit Download PDFInfo
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- CN110518791A CN110518791A CN201910924613.7A CN201910924613A CN110518791A CN 110518791 A CN110518791 A CN 110518791A CN 201910924613 A CN201910924613 A CN 201910924613A CN 110518791 A CN110518791 A CN 110518791A
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- 230000011218 segmentation Effects 0.000 claims abstract description 62
- 239000003990 capacitor Substances 0.000 claims description 89
- 238000002955 isolation Methods 0.000 claims description 33
- 230000005611 electricity Effects 0.000 claims description 23
- 238000005070 sampling Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 10
- 238000003466 welding Methods 0.000 description 10
- 230000006978 adaptation Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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
- 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
- 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
- H02M1/4216—Arrangements for improving power factor of AC input operating from a three-phase input voltage
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The embodiment of the invention discloses a kind of PFC control circuits, the PFC control circuit includes drive control circuit, it is segmented potential circuit and starting control circuit, drive control circuit is used to adjust the signal of driving signal output end output according to the signal at detecting voltage end, the detecting voltage end of the output end and drive control circuit that are segmented potential circuit is electrically connected, potential circuit is segmented for the signal according to control terminal, the voltage that the voltage that input terminal inputs is divided at least two grades is exported from output end, the control terminal of the output end and segmentation potential circuit that start control circuit is electrically connected, the grade of the voltage for the control signal control segmentation potential circuit output that starting control circuit is used to be inputted according to input terminal.The embodiment of the present invention provides a kind of PFC control circuit, to realize that drive control circuit has the range of fit of biggish input network voltage, PFC control circuit work can be made in bigger voltage range.
Description
Technical field
The present embodiments relate to voltage control technology more particularly to a kind of PFC control circuits.
Background technique
With the extensive use of contravariant welding and cutting power supply, the current distortion problem that inverter generates power grid is aobvious
It obtains and more protrudes, active PFC (Power Factor Correction, PFC) technology can efficiently solve electricity
Flow aberration problems.
Currently, thering are many producers to release for single-phase 85Vac~270Vac network voltage input range in field of power supplies
Active PFC controls chip, these existing chips can be applied to inversion welding in above-mentioned input voltage range and cutting power supply is led
Domain, but can not work in bigger voltage range, it is to be improved to the range of fit of the network voltage of input.
Summary of the invention
The embodiment of the present invention provides a kind of PFC control circuit, to realize that drive control circuit has biggish input power grid electricity
The range of fit of pressure can make PFC control circuit work in bigger voltage range.
In a first aspect, the embodiment of the invention provides a kind of PFC control circuits, comprising:
Drive control circuit, including detecting voltage end and driving signal output end, drive control circuit are used for according to voltage
The signal of the signal adjustment driving signal output end output of sense terminal；
It is segmented potential circuit, including input, output end and control terminal, is segmented the output end and drive control of potential circuit
The detecting voltage end of circuit is electrically connected, and segmentation potential circuit is used for the signal according to control terminal, the voltage that input terminal is inputted
The voltage for being divided at least two grades is exported from output end；
Start control circuit, including input terminal and output end, start the output end of control circuit and is segmented potential circuit
Control terminal is electrically connected, the control signal control segmentation potential circuit output that starting control circuit is used to be inputted according to input terminal
The grade of voltage.
Optionally, drive control circuit includes first resistor, second resistance, first capacitor, the second capacitor and power factor
It corrects PFC and controls chip；The first end of first resistor is the input terminal of drive control circuit, the second end and PFC of first resistor
The current sampling input pin electrical connection of chip is controlled, the first end of first capacitor is electrically connected with the second end of first resistor, the
The second end of one capacitor is grounded, and the first end of the second capacitor is electrically connected with the feedback constant correction input pin of PFC control chip,
The second end of second capacitor is electrically connected with the second end of first capacitor, the frequency of first end and PFC the control chip of second resistance
Input pin electrical connection is set, the second end of second resistance is electrically connected with the second end of the second capacitor, and PFC controls the driving of chip
Driving signal output end of the pin as drive control circuit is controlled, PFC controls the Voltage Feedback correction pin of chip as drive
The detecting voltage end of dynamic control circuit is electrically connected with segmentation potential circuit.
Optionally, segmentation potential circuit includes 3rd resistor, the 4th resistance, the 5th resistance and isolation circuit；3rd resistor
Input terminal of the first end as segmentation potential circuit, the first end of the 4th resistance is electrically connected with the first end of 3rd resistor, the
The second end of four resistance is electrically connected with the first end of isolation circuit, and the second end of isolation circuit and the second end of 3rd resistor are electrically connected
It connecing, the first end of the 5th resistance is electrically connected with the second end of 3rd resistor, the second end of the 5th resistance ground connection, and the of isolation circuit
One end is electrically connected as the control terminal of segmentation potential circuit with starting control circuit, and the second end of 3rd resistor is as segmentation voltage
The output end of circuit is electrically connected with drive control circuit.
Optionally, starting control circuit is opened including the 6th resistance, the 7th resistance, third capacitor, first switch tube and second
Guan Guan；The first end of 6th resistance is the input terminal for starting control circuit, second end and the institute's first switch tube of the 6th resistance
First end electrical connection, the second end of first switch tube is electrically connected to a power source, and the of the control terminal of first switch tube and the 7th resistance
One end electrical connection, the second end of the 7th resistance are electrically connected with the first end of second switch, the first end of third capacitor and second
The first end of switching tube is electrically connected, and the second end of third capacitor is electrically connected with the second end of second switch, second switch
The control terminal of second end ground connection, second switch is electrically connected as the output end of starting control circuit with segmentation potential circuit.
Optionally, drive control circuit further includes the 8th resistance, the 4th capacitor and the 5th capacitor, the first end of the 8th resistance
It is electrically connected with the voltage constant correction pin of PFC control chip, the second end of the 8th resistance and the first end of the 4th capacitor are electrically connected
It connects, the second end of the 4th capacitor is electrically connected with the second end of the 5th resistance, the first end of the 5th capacitor and the first of the 8th resistance
End electrical connection, the second end of the 5th capacitor are electrically connected with the second end of the 4th capacitor.
Optionally, isolation circuit is diode, and the first end of isolation circuit is the positive terminal of diode, the of isolation circuit
Two ends are the negative pole end of diode.
Optionally, segmentation potential circuit further includes the 6th capacitor, the first end of the 6th capacitor and the second end of isolation circuit
Electrical connection, the second end of the 6th capacitor are electrically connected with the second end of the 5th resistance.
Optionally, first switch tube and second switch are triode, and the first end of first switch tube is base stage, and first
The second end of switching tube is emitter, and the control terminal of first switch tube is collector, and the first end of second switch is base stage, the
The second end of two switching tubes is emitter, and the control terminal of second switch is collector.
Optionally, starting control circuit further includes the 9th resistance, the tenth resistance and zener diode, and the first of the 9th resistance
End is electrically connected with the first end of first switch tube, and the second end of the 9th resistance is electrically connected with the second end of first switch tube, and the tenth
The first end of resistance is electrically connected with the first end of third capacitor, and the second end of the tenth resistance and the second end of third capacitor are electrically connected
It connects, the first end of third capacitor is electrically connected by zener diode with second switch, the negative pole end and third of zener diode
The first end of capacitor is electrically connected, and the positive terminal of zener diode is electrically connected with the first end of second switch.
Optionally, the control terminal of first switch tube is also electrically connected with the power pins of PFC control chip.
PFC control circuit provided in an embodiment of the present invention, including drive control circuit, segmentation potential circuit and starting control
Circuit, drive control circuit adjust the signal that driving signal output end exports, starting control electricity according to the signal at detecting voltage end
The output end on road and the control terminal of segmentation potential circuit are electrically connected, the control signal that starting control circuit is inputted according to input terminal
The grade of the voltage of control segmentation potential circuit output, is segmented the output end of potential circuit and the detecting voltage of drive control circuit
End is electrically connected, and the voltage that input terminal inputs is divided at least two grades according to the signal of control terminal by segmentation potential circuit
Voltage is output to drive control circuit from output end, so that the input voltage range of drive control circuit be made to expand, realizes driving
Control circuit has the range of fit of biggish input network voltage, and PFC control circuit work can be made in bigger voltage range.
Detailed description of the invention
Fig. 1 is a kind of structural block diagram of PFC control circuit provided in an embodiment of the present invention；
Fig. 2 is a kind of structural schematic diagram of drive control circuit provided in an embodiment of the present invention；
Fig. 3 is a kind of structural schematic diagram for being segmented potential circuit provided in an embodiment of the present invention；
Fig. 4 is a kind of structural schematic diagram for starting control circuit provided in an embodiment of the present invention；
Fig. 5 is a kind of structural schematic diagram of PFC control circuit provided in an embodiment of the present invention.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limiting the invention.It also should be noted that in order to just
Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
A kind of PFC control circuit is present embodiments provided, the present embodiment is applicable to the contravariant using PFC control circuit
The fields such as welding and cutting power supply, Fig. 1 is a kind of structural block diagram of PFC control circuit provided in an embodiment of the present invention, with reference to figure
1, which includes: drive control circuit 10, segmentation potential circuit 20 and starting control circuit 30；
Drive control circuit 10 includes detecting voltage end A1 and driving signal output end B1, and drive control circuit 10 is used for root
According to the signal of the signal adjustment driving signal output end B1 output of detecting voltage end A1；
Being segmented potential circuit 20 includes input terminal C1, output terminals A 2 and control terminal D1, is segmented the output terminals A 2 of potential circuit
It is electrically connected with the detecting voltage end A1 of drive control circuit, segmentation potential circuit is used for the signal according to control terminal D1, will be defeated
The voltage that the voltage for entering to hold C1 to input is divided at least two grades is exported from output terminals A 2；
Starting control circuit 30 includes input terminal E1 and output end D2, starts the output end D2 and segmentation electricity of control circuit 30
The control terminal D1 of volt circuit 20 is electrically connected, the control signal control point that starting control circuit 30 is used to be inputted according to input terminal E1
The grade for the voltage that section potential circuit 20 exports.
Illustratively, contravariant welding in cutting equipment, the convert alternating current that is inputted power grid by inverter
It is that contravariant welding is powered with cutting equipment for direct current, the PFC control of the present embodiment can be used in the control circuit of inverter
Circuit, starting control circuit 30 input terminal E1 can input starting control signal, the starting control signal can be high level or
Low level starting controls signal, and starting control circuit 30 is input to segmentation potential circuit 20 according to starting control signal control and controls
The signal of end D1 processed makes to be segmented potential circuit 20 according to the signal of control terminal D1, the input terminal C1 voltage inputted is divided at least
The voltage of two grades is output to drive control circuit 10 from output terminals A 2, such as defeated in start-up course control segmentation potential circuit
Voltage V1 out, after start completion, control segmentation voltage follower circuit output voltage V2, voltage V1 and voltage V2 is unequal i.e.
Control segmentation potential circuit 20 outputs the voltage V1 and V2 of two grades.Pass through the controllable segmentation voltage of starting control circuit 30
Circuit 20 exports the voltage of at least two grades, increases the voltage range that segmentation potential circuit 20 exports, makes to pass through detecting voltage
The voltage range that end A1 is input to drive control circuit 10 increases.For example, being input to inverse in contravariant welding with cutting equipment
When variant welding and the voltage of the inverter of cutting equipment are lower than 85Vac, drive control circuit 10 protects threshold values locking not
Can normally it start, when being input to the voltage of inverter higher than 270Vac, the starting current impact of drive control circuit 10 is larger
The normal work of influence inverter, the PFC control circuit of the present embodiment, when the voltage for inputting inverter is lower than 85Vac,
Drive control circuit 10 protects threshold values locking not start, and is higher than 270Vac in the voltage of input inverter, voltage exists
When between 270Vac to 660Vac, the output voltage of the main circuit of inverter is input to segmentation potential circuit 20, starting control
The starting control signal of circuit input low level may make the segmentation potential circuit 20 of initial start stage to be output to drive control circuit
10 voltage reduces, and achieving the purpose that, which reduces inrush current, normally starts, to make the input voltage of inverter can be
Between 270Vac to 660Vac, the alternating voltage of inverter can operating input range improved by original 85Vac~265Vac
To 85Vac~660Vac, the input adaptation of inverter can be made to exchange the list of 110Vac to 575Vac, three-phase power grid voltage, it can
Improve range of fit of the contravariant welding with the inverter in cutting equipment to network voltage.
PFC control circuit provided in this embodiment, including drive control circuit, segmentation potential circuit and starting control electricity
Road, drive control circuit adjust the signal that driving signal output end exports according to the signal at detecting voltage end, start control circuit
Output end and the control terminal of segmentation potential circuit be electrically connected, the control signal control that is inputted according to input terminal of starting control circuit
The grade of the voltage of system segmentation potential circuit output, is segmented the output end of potential circuit and the detecting voltage end of drive control circuit
It is electrically connected, the voltage that input terminal inputs is divided into the electricity of at least two grades according to the signal of control terminal by segmentation potential circuit
Pressure is output to drive control circuit from output end, so that the input voltage range of drive control circuit be made to expand, realizes driving control
Circuit processed has the range of fit of biggish input network voltage, and PFC control circuit work can be made in bigger voltage range.
Fig. 2 is a kind of structural schematic diagram of drive control circuit provided in an embodiment of the present invention, in above-mentioned technical proposal
On the basis of, optionally, with reference to Fig. 2, drive control circuit 10 includes first resistor R1, second resistance R2, first capacitor C1, second
Capacitor C2 and PFC PFC controls chip 11；The first end of first resistor R1 is the input terminal of drive control circuit 10
The current sampling input pin 3 of the second end of F1, first resistor R1 and PFC control chip 11 is electrically connected, and the of first capacitor C1
One end is electrically connected with the second end of first resistor R1, the second end ground connection of first capacitor C1, the first end and PFC of the second capacitor C2
The feedback constant correction input pin 2 for controlling chip 11 is electrically connected, the second end of the second capacitor C2 and the second of first capacitor C1
End electrical connection, the first end of second resistance R2 are electrically connected with the frequency setting input pin 4 of PFC control chip 11, second resistance
The second end of R2 is electrically connected with the second end of the second capacitor C2, and the drive control pin 8 that PFC controls chip 11 is used as drive control
The driving signal output end B1, PFC of circuit 10 control the Voltage Feedback correction pin 6 of chip 11 as drive control circuit 10
Detecting voltage end A1 is electrically connected with segmentation potential circuit 20.
Illustratively, the model that PFC controls chip 11 can be ICE2PCS01G, and it can be active PFC that PFC, which controls chip 11,
Chip is controlled, PFC controls 7 input power of power pins of chip 11, and the input terminal F1 of drive control circuit 10 can be inputted and PFC
The current sampling signal of the inverter main circuit of control circuit electrical connection, current sampling signal are input to by first resistor R1
The current sampling input pin 3 of PFC control chip 11.
Fig. 3 is that a kind of structural schematic diagram for being segmented potential circuit provided in an embodiment of the present invention optionally with reference to Fig. 3, divides
Section potential circuit 20 includes 3rd resistor R4, the 4th resistance R5, the 5th resistance R6 and isolation circuit 21；The first of 3rd resistor R4
The input terminal C1 as segmentation potential circuit 20 is held, the first end of the 4th resistance R5 is electrically connected with the first end of 3rd resistor R4,
The second end of 4th resistance R5 is electrically connected with the first end of isolation circuit 21, and the second end of isolation circuit 21 is with 3rd resistor R4's
Second end electrical connection, the first end of the 5th resistance R6 are electrically connected with the second end of 3rd resistor R4, the second end of the 5th resistance R6
The first end of ground connection, isolation circuit 21 is electrically connected as the control terminal D1 of segmentation potential circuit 20 with starting control circuit, third
The second end of resistance R4 is electrically connected as the output end of segmentation potential circuit 20 with drive control circuit.
Specifically, the on-off of isolation circuit 21 influences the 4th resistance R5 and 3rd resistor R4 and the 4th resistance R5 and the 5th
The connection relationship of resistance R6, segmentation potential circuit 20 pass through input terminal C1 input voltage, when isolation circuit 21 is connected, third electricity
It connects after resistance R4 and the 4th resistance R5 are in parallel with the 5th resistance R6, the electric current that the 4th resistance R5 provides superposition leads isolation circuit 21
Segmentation potential circuit 20 exports the voltage of the first estate when logical；When isolation circuit 21 is ended, isolation circuit 21 can be isolated the 4th
Influence of the resistance R5 to 3rd resistor R4 and the 5th resistance R6 pressure divider circuit, the electricity of segmentation potential circuit 20 output and the first estate
The voltage for the second grade for pressing range different, in this way, segmentation potential circuit 20 exports the voltage of two grades, the voltage model of output
It encloses bigger.
Optionally, with reference to Fig. 3, isolation circuit 21 is diode D1, the first end of isolation circuit 21 be diode D1 just
Extremely, the second end of isolation circuit 21 is the negative pole end of diode D1.
Specifically, the characteristic reversely ended is connected according to diode forward, in second switch cut-off, with second switch
The positive terminal of the diode D1 of the control terminal electrical connection of pipe is high level, diode D1 conducting；In second switch conducting, with
The positive terminal of the diode D1 of the control terminal electrical connection of second switch is low level, and the 4th resistance is isolated in diode D1 cut-off
Influence of the R5 to 3rd resistor R4 and the 5th resistance R6 pressure divider circuit.
Optionally, with reference to Fig. 3, being segmented potential circuit 20 further includes the 6th capacitor C5, the first end of the 6th capacitor C5 with every
Second end electrical connection from circuit 21, the second end of the 6th capacitor C5 are electrically connected with the second end of the 5th resistance R6.
Wherein, it is grounded after the 6th capacitor C5 is in parallel with the 5th resistance R6, is segmented potential circuit 20 according to the letter of control terminal D1
Number, the voltage that the input terminal C1 voltage inputted is divided at least two grades is output to drive control circuit 10 from output terminals A 2
In, PFC control chip can be adapted to list, the three phase network of exchange 110Vac to 575Vac.There are many producers in field of power supplies at present
The active PFC released for single-phase 85Vac~270Vac power grid input range controls chip, in contravariant welding and cutting equipment
Inverter control circuit in, when being input to the voltage of inverter lower than 85Vac, PFC controls chip interior and protects valve
Value locking cannot normally start, and when being input to the voltage of inverter higher than 270Vac, PFC controls the starting current impact of chip
The very big normal work for influencing inverter of larger and output voltage+BUS value, the PFC control circuit of the present embodiment are inverse inputting
When the voltage of variable power source is lower than 85Vac, PFC control chip interior protects threshold values locking not start, in the electricity of input inverter
Pressure is higher than 270Vac, and when voltage is between 270Vac to 660Vac, the output voltage of the main circuit of inverter passes through input terminal
C1 is input to segmentation potential circuit 20, and when the starting of starting control circuit input low level controls signal, second switch is in
Off state, the electric current that the 4th resistance R5 provides superposition make the segmentation potential circuit 20 of initial start stage be output to PFC control core
The voltage of piece reduces, and achieving the purpose that, which reduces inrush current, normally starts, to make the input voltage of inverter can be
Between 270Vac to 660Vac, the alternating voltage of inverter can operating input range improved by original 85Vac~265Vac
To 85Vac~660Vac, the input adaptation of inverter can be made to exchange the list of 110Vac to 575Vac, three-phase power grid voltage.
Fig. 4 is a kind of structural schematic diagram for starting control circuit provided in an embodiment of the present invention, in above-mentioned technical proposal
On the basis of, optionally, with reference to Fig. 4, starts control circuit and opened including the 6th resistance R7, the 7th resistance R8, third capacitor C6, first
Close pipe Q1 and second switch Q2；The first end of 6th resistance R7 is the input terminal E1, the 6th resistance R7 for starting control circuit 30
Second end be electrically connected with the first end of institute first switch tube Q1, the second end of first switch tube Q1 is electrically connected with power supply+VCC,
The control terminal of first switch tube Q1 is electrically connected with the first end of the 7th resistance R9, the second end and second switch of the 7th resistance R9
The first end of Q2 is electrically connected, and the first end of third capacitor C6 is electrically connected with the first end of second switch Q2, third capacitor C6's
Second end is electrically connected with the second end of second switch Q2, the second end ground connection of second switch Q2, the control of second switch Q2
End processed is electrically connected as the output end D2 of starting control circuit 30 with segmentation potential circuit.
Illustratively, first switch tube Q1 low level is connected, and the conducting of second switch Q2 high level starts control circuit 30
Input terminal E1 can the starting of input low level control signal, control after signal the by the starting of input terminal E1 input low level
One switching tube Q1 conducting, power supply+VCC can be third capacitor C6 charging by the 7th resistance R9, in third capacitor C6 charging process
In, the first end of second switch Q2 is low level, and second switch Q2 cut-off, i.e., the control terminal with second switch Q2 is electrically connected
The first end of isolation circuit is high level in the segmentation potential circuit connect, and isolation circuit is connected at this time, and the 4th resistance provides superposition
Electric current when isolation circuit is connected segmentation potential circuit export the voltage of the first estate；After third capacitor C6 is fully charged, electricity
The voltage of source+VCC inputs the first end of second switch Q2 by the 7th resistance R9, and the first end of second switch Q2 is at this time
High level, second switch Q2 conducting, the second end ground connection of second switch Q2, then the control terminal with second switch Q2 is electrically connected
The first end of the isolation circuit connect is low level, and isolation circuit is ended at this time, and the 4th resistance is isolated to 3rd resistor in isolation circuit
With the influence in the 5th electric resistance partial pressure circuit, it is segmented potential circuit and exports second grade different from the voltage range of the first estate
Voltage, thus the grade of the voltage by starting control circuit control segmentation potential circuit output.
Optionally, referring to figs. 2 and 3, drive control circuit 10 further includes the 8th resistance R3, the 4th capacitor C3 and the 5th electricity
Hold C4, the first end of the 8th resistance R3 is electrically connected with the voltage constant correction pin 5 of PFC control chip 11, the 8th resistance R3's
Second end is electrically connected with the first end of the 4th capacitor C3, and the second end of the 4th capacitor C3 and the second end of the 5th resistance R6 are electrically connected
It connects, the first end of the 5th capacitor C4 is electrically connected with the first end of the 8th resistance R3, the second end and the 4th capacitor of the 5th capacitor C4
The second end of C3 is electrically connected.
Wherein, the 5th resistance in the second end of the 4th capacitor C3 in drive control circuit 10 and segmentation potential circuit 20
It is grounded after the second end electrical connection of R6, the voltage constant correction pin 5 that PFC controls chip 11 passes through the 8th resistance R3, the 4th electricity
Hold C3 and the 5th capacitor C4 ground connection.
It optionally, is triode with reference to Fig. 4, first switch tube Q1 and second switch Q2, the of first switch tube Q1
One end is base stage, and the second end of first switch tube Q1 is emitter, and the control terminal of first switch tube Q1 is collector, second switch
The first end of pipe Q2 is base stage, and the second end of second switch Q2 is emitter, and the control terminal of second switch Q2 is collector.
Illustratively, first switch tube Q1 is PNP type triode, inputs low electricity in the input terminal E1 of starting control circuit 30
First switch tube Q1 is connected when flat starting controls signal, and second switch Q2 is NPN type triode, first switch tube Q1 is led
Power supply+VCC is third capacitor C6 charging by first switch tube Q1 and the 7th resistance R9 after logical, fully charged in third capacitor C6
Afterwards, the base stage of second switch Q2 is high level, and second switch Q2 is connected, namely (third capacitor C6 fills by certain time
This period is connected to second switch Q2 in the electric time) delay second switch Q2 conducting, starting control circuit 10 passes through the
The grade for the voltage that the switch state control segmentation potential circuit 10 that two switching tube Q2 are switched off and on exports.
Optionally, with reference to Fig. 4, starting control circuit 30 further includes the 9th resistance R8, the tenth resistance R10 and zener diode
The first end of Z1, the 9th resistance R8 are electrically connected with the first end of first switch tube Q1, and the second end of the 9th resistance R8 is opened with first
The second end electrical connection of pipe Q1 is closed, the first end of the tenth resistance R10 is electrically connected with the first end of third capacitor C6, the tenth resistance
The second end of R10 is electrically connected with the second end of third capacitor C6, and the first end of third capacitor C6 passes through zener diode Z1 and the
Two switching tube Q2 electrical connection, zener diode negative pole end be electrically connected with the first end of third capacitor C6, zener diode Z1
Positive terminal be electrically connected with the first end of second switch Q2.
Specifically, being grounded after the tenth resistance R10 is in parallel with third capacitor C6, power supply is electricity after third capacitor C6 is fully charged
Source voltage is input to the negative pole end of zener diode Z1, zener diode Z1 reverse breakdown, and pressure stabilizing by the 7th resistance R9
Pressure stabilization function is played after diode Z1 reverse breakdown, the of the second switch Q2 being electrically connected with the positive terminal of zener diode Z1
One end is high level, the conducting of second switch Q2 high level；In third capacitor C6 charging process, the cathode of zener diode Z1
Hold voltage lower, Z1 reversely ends, i.e., the first end for the second switch Q2 being electrically connected with the positive terminal of zener diode Z1 is
Low level, second switch Q2 low level cut-off, so that starting control circuit 10 was switched off and on by second switch Q2
The grade for the voltage that switch state control segmentation potential circuit 10 exports.
Fig. 5 is a kind of structural schematic diagram of PFC control circuit provided in an embodiment of the present invention, and drive control circuit 10 is divided
The connection relationship of section potential circuit 20 and starting control circuit 30 is as shown in figure 5, the control terminal and PFC of first switch tube Q1 are controlled
The power pins 7 of coremaking piece 11 are electrically connected, when starting the input terminal E1 input low level starting control signal of control circuit 30,
First switch tube Q1 conducting, power supply+VCC are connected with the access of the power pins 7 of PFC control chip 11, and power supply is that PFC controls core
It is third capacitor C6 charging that the power supply of piece 11 and power supply, which pass through first switch tube Q1 and the 7th resistance R9, is charged in third capacitor C6
The first end of Cheng Zhong, second switch Q2 are low level, and second switch Q2 cut-off is that is, electric with the control terminal of second switch Q2
The first end of diode D1 is high level in the segmentation potential circuit 20 of connection, and diode D1 is connected at this time, and the 4th resistance R5 is mentioned
Make the voltage that the output the first estate of potential circuit 20 is segmented when diode D1 conducting for the electric current of superposition, the voltage of the first estate is logical
The second end for crossing 3rd resistor R4 is output to the Voltage Feedback correction pin 6 of PFC control chip 11；It is fully charged in third capacitor C6
Afterwards, the first end of second switch Q2 is high level, and second switch Q2 is connected, namely passes through certain time (third capacitor C6
Charging time to second switch Q2 be connected this period) delay second switch Q2 conducting, the second of second switch Q2
End ground connection, the then first end for the diode D1 being electrically connected with the control terminal of second switch Q2 are low level, at this time diode D1
Influence of the 4th resistance R5 to 3rd resistor R4 and the 5th resistance R6 pressure divider circuit, segmentation voltage electricity is isolated in cut-off, diode D1
Road 20 exports the voltage of second grade different from the voltage range of the first estate, to pass through the starting control point of control circuit 30
Section potential circuit 20 is output to the grade of the voltage of drive control circuit 10.
For example, being input to the electricity of inverter in the control circuit of contravariant welding and the inverter of cutting equipment
It forces down when 85Vac, PFC control chip interior protection threshold values locking cannot normally start, and the voltage for being input to inverter is high
When 270Vac, the starting current of PFC control chip is impacting the very big influence inverter of larger and output voltage+BUS value just
Often work, the PFC control circuit of the present embodiment, when the voltage for inputting inverter is lower than 85Vac, PFC controls chip interior
It protects threshold values locking not start, is higher than 270Vac in the voltage of input inverter, when voltage is between 270Vac to 660Vac,
The output voltage of the main circuit of inverter is input to segmentation potential circuit 20 by input terminal C1, when starting control circuit input
Low level starting controls signal, and second switch is in off state, and the electric current that the 4th resistance R5 provides superposition to start
The voltage that the segmentation potential circuit 20 at initial stage is output to PFC control chip reduces, and reaching, which reduces inrush current, normally starts
Purpose, to make the input voltage of inverter can be between 270Vac to 660Vac, the alternating voltage of inverter can work
Make input range and 85Vac~660Vac is increased to by original 85Vac~265Vac, the input adaptation of inverter can be made to exchange
The list of 110Vac to 575Vac, three-phase power grid voltage.
PFC control circuit provided in this embodiment, including drive control circuit, segmentation potential circuit and starting control electricity
Road, drive control circuit adjust the signal that driving signal output end exports according to the signal at detecting voltage end, start control circuit
According to the grade of the voltage of the control signal control segmentation potential circuit output of input terminal input, potential circuit is segmented according to control
The voltage that the voltage that input terminal inputs is divided at least two grades is output to drive control circuit from output end by the signal at end,
To make the input voltage range of drive control circuit expand, realize that drive control circuit has the suitable of biggish input network voltage
With range, PFC control circuit work can be made in bigger voltage range.
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that
The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out by above embodiments to the present invention
It is described in further detail, but the present invention is not limited to the above embodiments only, without departing from the inventive concept, also
It may include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.
Claims (10)
1. a kind of PFC control circuit characterized by comprising
Drive control circuit, including detecting voltage end and driving signal output end, the drive control circuit are used for according to voltage
The signal of the signal adjustment driving signal output end output of sense terminal；
It is segmented potential circuit, including input, output end and control terminal, the output end of the segmentation potential circuit and the driving
The detecting voltage end of control circuit is electrically connected, and the segmentation potential circuit is used for the signal according to control terminal, and input terminal is defeated
The voltage that the voltage entered is divided at least two grades is exported from output end；
The starting control circuit, including input terminal and output end, the output end and segmentation electricity of the starting control circuit
The control terminal of volt circuit is electrically connected, and the control signal that the starting control circuit is used to be inputted according to input terminal controls described point
The grade of the voltage of section potential circuit output.
2. PFC control circuit according to claim 1, which is characterized in that the drive control circuit include first resistor,
Second resistance, first capacitor, the second capacitor and PFC PFC control chip；The first end of the first resistor is institute
The input terminal of drive control circuit is stated, the second end of the first resistor and the current sampling input of PFC control chip are drawn
Foot electrical connection, the first end of the first capacitor are electrically connected with the second end of the first resistor, and the second of the first capacitor
End ground connection, the first end of second capacitor is electrically connected with the feedback constant correction input pin of PFC control chip, described
The second end of second capacitor is electrically connected with the second end of the first capacitor, and the first end of the second resistance and the PFC are controlled
The frequency setting input pin electrical connection of coremaking piece, the second end of the second resistance and the second end of second capacitor are electrically connected
It connects, driving signal output end of the drive control pin of the PFC control chip as the drive control circuit, the PFC
Control detecting voltage end and the segmentation potential circuit of the Voltage Feedback correction pin of chip as the drive control circuit
Electrical connection.
3. PFC control circuit according to claim 2, which is characterized in that the segmentation potential circuit include 3rd resistor,
4th resistance, the 5th resistance and isolation circuit；Input terminal of the first end of the 3rd resistor as the segmentation potential circuit,
The first end of 4th resistance is electrically connected with the first end of the 3rd resistor, the second end of the 4th resistance and it is described every
First end electrical connection from circuit, the second end of the isolation circuit is electrically connected with the second end of the 3rd resistor, and described the
The first end of five resistance is electrically connected with the second end of the 3rd resistor, the second end ground connection of the 5th resistance, the isolation
The first end of circuit is electrically connected as the control terminal of the segmentation potential circuit with the starting control circuit, the 3rd resistor
Second end as it is described segmentation potential circuit output end be electrically connected with the drive control circuit.
4. PFC control circuit according to claim 3, which is characterized in that the starting control circuit include the 6th resistance,
7th resistance, third capacitor, first switch tube and second switch；The first end of 6th resistance is starting control electricity
The input terminal on road, the second end of the 6th resistance are electrically connected with the first end of institute's first switch tube, the first switch tube
Second end is electrically connected to a power source, and the control terminal of the first switch tube is electrically connected with the first end of the 7th resistance, and described
The second end of seven resistance is electrically connected with the first end of the second switch, and the first end of the third capacitor is opened with described second
The first end electrical connection of pipe is closed, the second end of the third capacitor is electrically connected with the second end of the second switch, and described the
The second ends of two switching tubes is grounded, the control terminal of the second switch as the starting control circuit output end with it is described
It is segmented potential circuit electrical connection.
5. PFC control circuit according to claim 3, which is characterized in that the drive control circuit further includes the 8th electricity
The voltage constant of resistance, the 4th capacitor and the 5th capacitor, the first end of the 8th resistance and PFC control chip corrects pin
Electrical connection, the second end of the 8th resistance are electrically connected with the first end of the 4th capacitor, the second end of the 4th capacitor
It is electrically connected with the second end of the 5th resistance, the first end of the 5th capacitor and the first end of the 8th resistance are electrically connected
It connects, the second end of the 5th capacitor is electrically connected with the second end of the 4th capacitor.
6. PFC control circuit according to claim 3, which is characterized in that the isolation circuit is diode, the isolation
The first end of circuit is the positive terminal of the diode, and the second end of the isolation circuit is the negative pole end of the diode.
7. PFC control circuit according to claim 3, which is characterized in that the segmentation potential circuit further includes the 6th electricity
Hold, the first end of the 6th capacitor is electrically connected with the second end of the isolation circuit, the second end of the 6th capacitor and institute
State the second end electrical connection of the 5th resistance.
8. PFC control circuit according to claim 4, which is characterized in that the first switch tube and the second switch
Pipe is triode, and the first end of the first switch tube is base stage, and the second end of the first switch tube is emitter, described
The control terminal of first switch tube is collector, and the first end of the second switch is base stage, the second of the second switch
End is emitter, and the control terminal of the second switch is collector.
9. PFC control circuit according to claim 4, which is characterized in that the starting control circuit further includes the 9th electricity
Resistance, the tenth resistance and zener diode, the first end of the 9th resistance are electrically connected with the first end of the first switch tube, institute
The second end for stating the 9th resistance is electrically connected with the second end of the first switch tube, the first end of the tenth resistance and described the
The first ends of three capacitors is electrically connected, and the second end of the tenth resistance is electrically connected with the second end of the third capacitor, and described the
The first end of three capacitors is electrically connected by the zener diode with the second switch, the negative pole end of the zener diode
It is electrically connected with the first end of the third capacitor, the first end electricity of the positive terminal of the zener diode and the second switch
Connection.
10. PFC control circuit according to claim 4, which is characterized in that the control terminal of the first switch tube also with institute
State the power pins electrical connection of PFC control chip.
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|---|---|---|---|
| CN201910924613.7A CN110518791A (en) | 2019-09-27 | 2019-09-27 | A kind of PFC control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910924613.7A CN110518791A (en) | 2019-09-27 | 2019-09-27 | A kind of PFC control circuit |
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| CN110518791A true CN110518791A (en) | 2019-11-29 |
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| CN201910924613.7A Pending CN110518791A (en) | 2019-09-27 | 2019-09-27 | A kind of PFC control circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113162404A (en) * | 2021-05-06 | 2021-07-23 | 上海广为焊接设备有限公司 | Control circuit and method of wide input voltage booster circuit |
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