CN108337768A - A kind of the PFC constant-current driving power supplies circuit and control method of double protections - Google Patents
A kind of the PFC constant-current driving power supplies circuit and control method of double protections Download PDFInfo
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- CN108337768A CN108337768A CN201711457620.8A CN201711457620A CN108337768A CN 108337768 A CN108337768 A CN 108337768A CN 201711457620 A CN201711457620 A CN 201711457620A CN 108337768 A CN108337768 A CN 108337768A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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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
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The invention discloses a kind of the PFC constant-current driving power supplies circuits and control method of double protections, including exchanging input rectifying filter unit, PFC power factor correction units, high frequency transformer, export filter unit and output unit, PFC power factor correction units are connect by a field-effect tube with high frequency transformer, the output of the output filter unit is connect by the 4th inductance with output unit, output filter unit is connect by constant current output sampling unit with PFC power factor correction units, it sends a signal to PFC power factor correction units immediately when output overcurrent and finally controls output current and be in constant current state, output signal feedback is forced down PFC power factor (PF)s adjusting chip voltage by safe secondary protection circuit and is stopped by output unit.This circuit realizes that multi-stage protection function, circuit are more stablized, while exporting setting capacitance and inductance and switching diode in filtering and making circuit stability, eliminates influence of the ripple to sampled signal.
Description
Technical field
The present invention relates to a kind of LED power circuit, the PFC constant-current driving power supplies circuit of especially a kind of double protections and control
Method.
Background technology
LED light is one piece of electroluminescent chip of semiconductor material, on elargol or latex solidified to holder, then uses silver
Line or gold thread connection chip and circuit board, surrounding are sealed with epoxy resin, play the role of protecting internal core, finally installation is outer
Shell, so the anti-seismic performance of LED lamps is good.The internal characteristics of LED determine that it is that optimal light source goes to replace traditional light
Source, it has extensive purposes.LED light has the following advantages：It is small；Power consumption is low, and LED power consumptions are at a fairly low, in general
The operating voltage of LED is 2-3.6V.Operating current is 0.02-0.03A.This is to say：The electric energy that it is consumed is no more than 0.1W；Make
With long lifespan, under appropriate electric current and voltage, the service life of LED was up to 100,000 hours；High brightness, low in calories, LED makes
With chemiluminescence technology, calorific value is more much lower than ordinary luminaire；Environmental protection, LED is made by nontoxic material, unlike fluorescent lamp
Can be polluted containing mercury, at the same LED can also recycling it is sturdy and durable, therefore be widely used, in the prior art
In stablize for the lamp string group for enabling light emitting diode (LED, Light Emitting Diode) or light emitting diode to form
It reliably works, two-stage PFC driving power circuits usually can be all used, to ensure that its high power factor, Harmonics of Input contain
Measure low, and the features such as can be optimized to DC/DC converters, but current PFC driving power circuit structures are opposite
Complexity, and can not ensure normally to work once driving chip or output feedback chip break down, therefore how to ensure
Entire circuit is required for the state in safety particularly important anyway.
Invention content
A kind of simple in structure, two-way guarantor of realization is provided the purpose of the present invention is to solve above-mentioned the deficiencies in the prior art
The PFC constant-current driving power supplies circuit and control method of a kind of double protections of shield.
To achieve the goals above, the PFC constant-current driving power supply circuits of a kind of double protections designed by the present invention, including hand over
Input rectifying filter unit, PFC power factor correction units, high frequency transformer T1, output filter unit and output unit are flowed,
The PFC power factor correction units adjust chip U1 by a PFC power factor (PF)s and are connect with peripheral circuit and by an effect
Should pipe Q1 connect with high frequency transformer T1, it is described output filter unit output connect with output unit by the 4th inductance L4,
Output end in output filter unit is connect by a constant current output sampling unit with PFC power factor correction units, once it is defeated
It PFC power factor correction units is sent a signal to when going out overcurrent immediately finally controls output current and be in constant current state, it is described
Output signal is fed back to the feeder ear control output that PFC power factor (PF)s adjust chip U1 by output unit by safe secondary protection circuit
Electric current is stablized, and the safe secondary protection circuit includes linear optical coupling U4, the 16th A resistance R16A, the 16th B resistance R16B, the tenth
Six C resistance R16C, the 16th D resistance R16D and third transistor Q3, wherein one end of the 16th D resistance R16D connects
The positive Vo+ of output unit is met, the other end of the 16th D resistance R16D connects the light emitting diode positive terminal of linear optical coupling U4,
Between two ends of output of the cathode Vo- of the light emitting diode negative pole end connection output unit of linear optical coupling U4, linear optical coupling U4
It is connected with the first capacitance C111 one by one, the base stage of first one end connection third transistor Q3 of capacitance C111 one by one, first one by one
The other end of capacitance C111 is grounded, and the collector of third transistor Q3 passes through the 16th B resistance R16B connection PFC power factor (PF) tune
The ends VCC for saving chip U1 connect the 16th A resistance R16A, third transistor between the collector and base stage of third transistor Q3
The emitter of Q3 is grounded, and the 16th C resistance R16C is connected between the base stage and ground of third transistor Q3.
Further, in order to make circuit more stablize, constant current effect is more preferable, the PFC power factor (PF)s adjust chip U1 with it is outer
The physical circuit connection structure for enclosing circuit is as follows：
It is model L6562 that the PFC power factor (PF)s, which adjust chip U1, and the GD feet of PFC power factor (PF)s adjusting chip U1 pass through
The S feet of the G feet of 17th resistance R17 connection field-effect tube Q1, field-effect tube Q1 pass through the 20th resistance R20 ground connection, PFC power
Factor adjusts the ends GS of chip U1 by the S feet of the 19th resistance R19 connection field-effect tube Q1, the S feet of field-effect tube Q1 and the
The 18th resistance R18 is connected between the common end of 19 resistance R19 and the G feet of field-effect tube Q1, PFC power factor (PF)s adjust core
The 17th capacitance C17 is connected between the ends GS of piece U1 and ground, the 17th capacitance C17 and the 19th resistance R19's is public
End passes through the output cathode end E of the 50th resistance R50 connection input rectifyings filter unit 1, is parallel with just on the 17th resistance R17
Pole connects the 14th diode D14 of field-effect tube Q1, is connected between the ends ZCD and ground of PFC power factor (PF)s adjusting chip U1
The ends ZCD that 16th capacitance C16, PFC power factor (PF) adjust chip U1 pass through the 16th resistance R16 connection high frequency transformers T1's
6 feet, 3 feet of the D feet connection high frequency transformer T1 of field-effect tube Q1, PFC power factor (PF)s adjust the COMP feet and PFC work(of chip U1
It is connected with concatenated 13rd capacitance C13 and the 8th resistance R8, and the 13rd capacitance between the INV of rate factor adjusting chip U1
It is parallel with the 14th capacitance C14 on C13 and the 8th resistance R8, connects between the INV feet and ground of PFC power factor (PF)s adjusting chip U1
There is the 9th resistance R9 and the tenth resistance R10, the 18th capacitance C18, the tenth resistance R10 and are parallel on the tenth resistance R10
The feedback end of the common end connection constant current output sampling unit 5 of nine resistance R9, the MULT feet that PFC power factor (PF)s adjust chip U1 are logical
Cross the output cathode end E of concatenated 3rd resistor R3 and the 4th resistance R4 connection input rectifying filter units, PFC power factor (PF) tune
The INV feet for saving chip U1 pass through concatenated 4th diode D4, twelfth resistor R12 ground connection, the 4th diode D4, the 12nd electricity
The common end of R12 is hindered by 6 feet of concatenated eleventh resistor R11 and the second diode D2 connection high frequency transformers T1, and the
6 feet of the anode connection high frequency transformer T1 of two diode D2, the cathode of the second diode D2 are also connected by thirteenth resistor R13
The collector of the second NPN triode Q2 is connect, the emitter of the second NPN triode Q2 passes through concatenated third diode D3 and
Three capacitance C3 ground connection, the base stage of the second NPN triode Q2 are grounded by the first zener diode ZD1, the second NPN triode Q2's
The second capacitance C2, the base stage of the emitter of the second NPN triode Q2 and the second NPN triode Q2 are connected between emitter and ground
It is connected with the 14th resistance R14, is in series between the D feet of field-effect tube Q1 and the output cathode end E of input rectifying filter unit
Be parallel on first diode D1 and the 15th capacitance C15, the 15th capacitance C15 by two groups respectively with after two resistor coupled in parallel again
Concatenated branch, 1 foot of high frequency transformer T1 are connect with the output cathode end E of input rectifying filter unit 1, PFC power factor (PF)s
It is connected between the MULT feet and ground of adjusting chip U1 in parallel by the 5th resistance R5, the 11st capacitance C11, the second voltage-stabiliser tube ZD4
Public termination supply voltage VCC1, the PFC power factor (PF) of the circuit of composition, third diode D3 and third capacitance C3 adjust core
8 feet of piece U1 meet supply voltage VCC1.
Further, double feedback operational amplifier U5 of the constant current output sampling unit 5 including model TSM103, linearly
Optocoupler U2 and peripheral circuit, 1 foot of double feedback operational amplifier U5 connect one of the 12nd common anode switching diode D12
Another negative pole end of negative pole end, the 12nd common anode switching diode D12 passes through the double feedback transports of the 45th resistance R45 connections
7 feet of amplifier U5, the light emitting diode cathode of the positive terminal connection linear optical coupling U2 of the 12nd common anode switching diode D12,
The light emitting diode anode of linear optical coupling U2 connects supply voltage VCC2, the transistor collector connection power supply of linear optical coupling U2
The transistor emitter of voltage VCC1, linear optical coupling U2 connect the common end of the tenth resistance R10 and the 9th resistance R9, described double anti-
It is in series with the three or four resistance R34 and the 25th between 2 feet of feedback operational amplifier U5 and 1 foot of double feedback operational amplifier U5
Capacitance C25 is connected between the filtering output cathode end in 2 feet and output filter unit of double feedback operational amplifier U5
Bleeder circuit, the bleeder circuit include the 31st resistance between the output end and ground being connected in output filter unit
R31 and the 33rd resistance R33 and the 32nd resistance R32 being connected in parallel on the 33rd resistance R33 are constituted, described double anti-
The 2 feet partial pressure for presenting operational amplifier U5 obtains voltage on the 33rd resistance R33,3 feet of double feedback operational amplifier U5 with
The 46th resistance R46,5 feet of double feedback operational amplifier U5 and double feedback transport amplifications are in series between supply voltage VCC2
The 39th resistance R39 and the 24th resistance R24, the 39th resistance R39 and the 24th are in series between 3 feet of device U5
The 38th resistance R38 is connected between the common end and ground of resistance R24,6 feet of double feedback operational amplifier U5 are filtered with output
Be connected with the 41st resistance R41 between filtering output negative pole end in wave unit 3,6 feet of double feedback operational amplifier U5 with
The 26th capacitance C26 and the 40th resistance R40 is in series between 7 feet of double feedback operational amplifier U5, double feedback transports are put
8 feet of big device U5 meet supply voltage VCC2,4 feet of 3 feet of double feedback operational amplifier U5 and double feedback operational amplifier U5 it
Between be connected with the 28th capacitance C28.
Further, in order to make circuit more stablize, the secondary that the output filter unit is included in high frequency transformer T1 is defeated
Go out 4 filter capacitor E1 in parallel between coil, the 43rd resistance R43, filter capacitor are parallel on filter capacitor E1
The positive terminal of E1 is connect with the 31st resistance R31, between the negative pole end and the output end of high frequency transformer T1 of filter capacitor E1
In parallel there are three common anode switching diodes, and the anode of 3 common anode switching diodes is connect with the negative pole end of filter capacitor E1, and 3
The cathode of a common anode switching diode is connect with high frequency transformer T1, is also parallel with by two on 3 common anode switching diodes
Again with a concatenated branch of capacitance after resistor coupled in parallel, the other end of the 31st resistance R31 connects one end of the 4th inductance L4,
Anode the 4th another feet of inductance L4 of connection of filter capacitor E1, two feet connection output unit of the 4th inductance L4, the 31st
Resistance R31 connect the 41st resistance R41 with the common end of the 4th inductance L4.
3 feet of the high frequency transformer T1,6 feet, 7 feet and the foot that is connect with filter capacitor E1 positive terminals are Same Name of Ends.
The invention also discloses a kind of control methods of the PFC constant-current driving power supply circuits of double protections, include specifically following
Step：
S1, preferred output are first obtained the feedback signal of the output current of output filter unit in real time by constant current output sampling unit,
Feedback signal is conveyed to PFC power factor correction units by linear isolation optocoupler, PFC power factor correction units are according to defeated
The variation for going out electric current carries out Active PFC, finally controls output constant current；
S2, second class protection secondly carrying out to output module by safe secondary protection circuit in real time, when output short-circuit, it is 0 to export,
Safe secondary protection circuit drags down the supply voltage of PFC power factor correction units at this time, so that it is not worked and is played a protective role with this,
It prevents from burning out component.
The PFC constant-current driving power supplies circuit and control method for a kind of double protections that the present invention obtains, are first adopted by constant current output
Sample unit obtains the feedback signal of the output current of output filter unit in real time, and feedback signal is conveyed by linear isolation optocoupler
PFC power factor correction units, PFC power factor correction units is given to carry out Active PFC according to the variation of output current,
Then final control output constant current carries out second class protection by safe secondary protection circuit to output module, defeated when output short-circuit
It is 0 to go out, and safe secondary protection circuit drags down the supply voltage of PFC power factor correction units at this time, so that it is not worked and plays guarantor with this
Shield acts on, and prevents from burning out component, final to realize multi-stage protection function so that circuit is more stablized, while exporting filtering
The each capacitance of middle setting and inductance and switching diode make circuit stability, eliminate influence of the ripple to sampled signal.
Description of the drawings
Fig. 1 is a kind of functional block diagram of the PFC constant-current driving power supply circuits of double protections in the present embodiment；
Fig. 2 be in the present embodiment a kind of PFC constant-current driving power supplies circuits of double protections in no PFC power factor correction units and
The schematic diagram of constant current output sampling unit；
Fig. 3 is the schematic diagram of PFC power factor correction units in the present embodiment；
Fig. 4 is the schematic diagram of constant current output sampling unit in the present embodiment.
In figure：Exchange input rectifying filter unit 1, PFC power factor correction units 2, output filter unit 3, output unit 4,
Constant current output sampling unit 5, safe secondary protection circuit 6, bleeder circuit 7.
Specific implementation mode
Present invention will be further explained below with reference to the attached drawings and examples.
Embodiment：
As shown in Figure 1 and Figure 2, the PFC constant-current driving power supply circuits of a kind of double protections provided by the invention, including exchange input are whole
Filter unit 1, PFC power factor correction units 2, high frequency transformer T1, output filter unit 3 and output unit 4 are flowed, it is described
PFC power factor correction units 2 adjust chip U1 by a PFC power factor (PF)s and are connect with peripheral circuit and by a field-effect tube
Q1 is connect with high frequency transformer T1, and the output of the output filter unit 3 is connect by the 4th inductance L4 with output unit 4, defeated
The output end gone out in filter unit 3 is connect by a constant current output sampling unit 5 with PFC power factor correction units 2, once it is defeated
Sending a signal to PFC power factor correction units 2 when going out overcurrent immediately, finally control output current is in constant current state, described
The feeder ear control that output signal is fed back to PFC power factor (PF)s adjusting chip U1 by safe secondary protection circuit 6 by output unit 4 is defeated
Go out electric current stabilization, the safe secondary protection circuit 6 includes linear optical coupling U4, the 16th A resistance R16A, the 16th B resistance R16B, the
16 C resistance R16C, the 16th D resistance R16D and third transistor Q3, wherein one end of the 16th D resistance R16D
Connect the positive Vo+ of output unit 4, the light emitting diode anode of the other end connection linear optical coupling U4 of the 16th D resistance R16D
End, two ends of output of the cathode Vo- of the light emitting diode negative pole end connection output unit 4 of linear optical coupling U4, linear optical coupling U4
Between be connected with the first capacitance C111 one by one, the base stage of first one end connection third transistor Q3 of capacitance C111 one by one, first
The other end ground connection of capacitance C111 one by one, the collector of third transistor Q3 by the 16th B resistance R16B connection PFC power because
Element adjusts the ends VCC of chip U1, connects the 16th A resistance R16A between the collector and base stage of third transistor Q3, and the three or three
The emitter of pole pipe Q3 is grounded, and the 16th C resistance R16C is connected between the base stage and ground of third transistor Q3.
Further, in order to make circuit more stablize, constant current effect is more preferable, the PFC power factor (PF)s adjust chip U1 with it is outer
The physical circuit connection structure for enclosing circuit is as follows：
As shown in figure 3, it is model L6562 that the PFC power factor (PF)s, which adjust chip U1, and PFC power factor (PF)s adjust chip U1
GD feet by the G feet of the 17th resistance R17 connection field-effect tube Q1, the S feet of field-effect tube Q1 are connect by the 20th resistance R20
Ground, the ends GS that PFC power factor (PF)s adjust chip U1 pass through the S feet of the 19th resistance R19 connection field-effect tube Q1, field-effect tube Q1
S feet and the common end and the G feet of field-effect tube Q1 of the 19th resistance R19 between be connected with the 18th resistance R18, PFC power
It is connected with the 17th capacitance C17, the 17th capacitance C17 and the 19th resistance between the ends GS and ground of factor adjusting chip U1
The output cathode end E, the 17th resistance R17 that the common end of R19 passes through the 50th resistance R50 connection input rectifyings filter unit 1
On be parallel with the 14th diode D14 of anode connection field-effect tube Q1, PFC power factor (PF)s adjust the ends ZCD and ground of chip U1
Between be connected with the 16th capacitance C16, the ends ZCD that PFC power factor (PF)s adjust chip U1 pass through the 16th resistance R16 connection high frequencies
6 feet of transformer T1,3 feet of the D feet connection high frequency transformer T1 of field-effect tube Q1, PFC power factor (PF)s adjust chip U1's
It is connected with concatenated 13rd capacitance C13 and the 8th resistance R8 between COMP feet and the INV of PFC power factor (PF)s adjusting chip U1,
And the 13rd is parallel with the 14th capacitance C14 on capacitance C13 and the 8th resistance R8, PFC power factor (PF)s adjust the INV feet of chip U1
It is in series with the 9th resistance R9 and the tenth resistance R10 between ground, is parallel with the 18th capacitance C18 on the tenth resistance R10, the tenth
Resistance R10 connect the feedback end of constant current output sampling unit 5 with the common end of the 9th resistance R9, and PFC power factor (PF)s adjust chip
The MULT feet of U1 by the output cathode end E of concatenated 3rd resistor R3 and the 4th resistance R4 connection input rectifyings filter unit 1,
The INV feet that PFC power factor (PF)s adjust chip U1 pass through concatenated 4th diode D4, twelfth resistor R12 ground connection, the four or two pole
Pipe D4, twelfth resistor R12 common end pass through concatenated eleventh resistor R11 and the second diode D2 connection high frequency transformers
6 feet of T1, and 6 feet of the anode connection high frequency transformer T1 of the second diode D2, the cathode of the second diode D2 is also by the
The collector of 13 resistance R13 the second NPN triodes of connection Q2, the emitter of the second NPN triode Q2 pass through concatenated third
Diode D3 and third capacitance C3 ground connection, the base stage of the second NPN triode Q2 are grounded by the first zener diode ZD1, the
The second capacitance C2, the emitter and second of the second NPN triode Q2 are connected between the emitter and ground of two NPN triode Q2
The base stage of NPN triode Q2 is connected with the 14th resistance R14, the output of the D feet and input rectifying filter unit 1 of field-effect tube Q1
It is in series with the first diode D1 and the 15th capacitance C15 between positive terminal E, is parallel with by two groups of difference on the 15th capacitance C15
With concatenated branch again after two resistor coupled in parallel, 1 foot of high frequency transformer T1 and the output cathode end of input rectifying filter unit 1
E connections, PFC power factor (PF)s adjust be connected between the MULT feet and ground of chip U1 by the 5th resistance R5, the 11st capacitance C11,
The public termination supply voltage VCC1 of the circuit that second voltage-stabiliser tube ZD4 parallel connections are constituted, third diode D3 and third capacitance C3,
8 feet that PFC power factor (PF)s adjust chip U1 meet supply voltage VCC1.
As shown in figure 4, further, in order to make circuit more stablize, the constant current output sampling unit 5 includes model
1 foot of double feedback operational amplifier U5, linear optical coupling U2 and the peripheral circuit of TSM103, double feedback operational amplifier U5 connects
A negative pole end of the 12nd common anode switching diode D12 is connect, another negative pole end of the 12nd common anode switching diode D12 is logical
Cross 7 feet of the double feedback operational amplifier U5 of the 45th resistance R45 connections, the positive terminal of the 12nd common anode switching diode D12
The light emitting diode cathode of linear optical coupling U2 is connected, the light emitting diode anode of linear optical coupling U2 connects supply voltage VCC2,
The transistor collector of linear optical coupling U2 connects supply voltage VCC1, and the transistor emitter of linear optical coupling U2 connects the tenth resistance
The common end of R10 and the 9th resistance R9,1 foot of 2 feet and double feedback operational amplifier U5 of double feedback operational amplifier U5
Between be in series with the three or four resistance R34 and the 25th capacitance C25,2 feet of double feedback operational amplifier U5 are filtered with output
Bleeder circuit 7 is connected between filtering output cathode end in wave unit 3, the bleeder circuit 7 includes being connected on output filtering
The 31st resistance R31 between output end and ground and the 33rd resistance R33 in unit 3 and it is connected in parallel on the 33rd electricity
The 32nd resistance R32 hindered on R33 is constituted, and the 2 feet partial pressure of double feedback operational amplifier U5 obtains the 33rd resistance
Voltage on R33 is in series with the 46th resistance R46 between 3 feet and supply voltage VCC2 of double feedback operational amplifier U5, double
It is in series with the 39th resistance R39 and second between 5 feet of feedback operational amplifier U5 and 3 feet of double feedback operational amplifier U5
14 resistance R24 are connected with the 38th electricity between the 39th resistance R39 and the common end and ground of the 24th resistance R24
R38 is hindered, the 4th is connected between the filtering output negative pole end in 6 feet and output filter unit 3 of double feedback operational amplifier U5
11 resistance R41, the 20th is in series between 6 feet of double feedback operational amplifier U5 and 7 feet of double feedback operational amplifier U5
8 feet of six capacitance C26 and the 40th resistance R40, double feedback operational amplifier U5 connect supply voltage VCC2, double feedback transport amplifications
It is connected with the 28th capacitance C28 between 3 feet of device U5 and 4 feet of double feedback operational amplifier U5.
Further, defeated in order to make circuit more stablize the secondary that the output filter unit 3 is included in high frequency transformer T1
Go out 4 filter capacitor E1 in parallel between coil, the 43rd resistance R43, filter capacitor are parallel on filter capacitor E1
The positive terminal of E1 is connect with the 31st resistance R31, between the negative pole end and the output end of high frequency transformer T1 of filter capacitor E1
In parallel there are three common anode switching diodes, and the anode of 3 common anode switching diodes is connect with the negative pole end of filter capacitor E1, and 3
The cathode of a common anode switching diode is connect with high frequency transformer T1, is also parallel with by two on 3 common anode switching diodes
Again with a concatenated branch of capacitance after resistor coupled in parallel, the other end of the 31st resistance R31 connects one end of the 4th inductance L4,
Anode the 4th another feet of inductance L4 of connection of filter capacitor E1, two feet connection output unit 4 of the 4th inductance L4, the 31st
Resistance R31 connect the 41st resistance R41 with the common end of the 4th inductance L4.
3 feet of the high frequency transformer T1,6 feet, 7 feet and the foot that is connect with filter capacitor E1 positive terminals are Same Name of Ends.
The present embodiment also discloses a kind of control method of the PFC constant-current driving power supply circuits of double protection, it is specific comprising with
Lower step：
S1, preferred output are first obtained the feedback letter of the output current of output filter unit 3 in real time by constant current output sampling unit 5
Number, feedback signal is conveyed to PFC power factor correction units 2, PFC power factor correction units 2 by linear isolation optocoupler
Active PFC is carried out according to the variation of output current, finally controls output constant current；
S2, second class protection is secondly carried out to output module 4 by safe secondary protection circuit 6 in real time, when output short-circuit, exports and be
0, at this time safe secondary protection circuit 6 drag down the supply voltage of PFC power factor correction units 2, so that it is not worked and protection played with this
Effect, prevents from burning out component.
Operation principle：First choice is obtained the feedback letter of the output current of output filter unit by constant current output sampling unit in real time
Number, feedback signal is conveyed to PFC power factor correction units, PFC power factor correction unit roots by linear isolation optocoupler
Active PFC is carried out according to the variation of output current, output constant current is finally controlled, then by safe secondary protection circuit to output
Module carries out second class protection, and when output short-circuit, it is 0 to export, and safe secondary protection circuit drags down PFC PFC lists at this time
The supply voltage of member, is made it not work and is played a protective role with this, prevent from burning out component, final to realize multi-stage protection function,
So that circuit is more stablized, while exporting and each capacitance and inductance are set in filtering and switching diode so that circuit is steady
It is fixed, eliminate influence of the ripple to sampled signal.
Claims (6)
1. a kind of PFC constant-current driving power supply circuits of double protections, including exchange input rectifying filter unit（1）, PFC power factors
Correct unit（2）, high frequency transformer（T1）, output filter unit（3）And output unit（4）, it is characterized in that：The PFC work(
Rate factor correcting unit（2）Chip is adjusted by a PFC power factor (PF)s（U1）It is connect with peripheral circuit and by a field-effect tube
（Q1）With high frequency transformer（T1）Connection, the output filter unit（3）Output pass through the 4th inductance（L4）With output unit
（4）Connection exports filter unit（3）In output end pass through a constant current output sampling unit（5）With PFC PFC lists
Member（2）Connection, sends a signal to PFC power factor correction units immediately when output overcurrent（2）Final control output electricity
Stream is in constant current state, the output unit（4）Pass through safe secondary protection circuit（6）Output signal is fed back into PFC power factor (PF)s
Adjust chip（U1）Feeder ear control outputting current steadily, the safe secondary protection circuit（6）Including linear optical coupling（U4）, the tenth
Six A resistance（R16A）, the 16th B resistance（R16B）, the 16th C resistance（R16C）, the 16th D resistance（R16D）With the three or three pole
Pipe（Q3）, wherein the 16th D resistance（R16D）One end connect output unit（4）Anode（Vo+）, the 16th D electricity
Resistance（R16D）The other end connect linear optical coupling（U4）Light emitting diode positive terminal, linear optical coupling（U4）Light emitting diode it is negative
Extreme connection output unit（4）Cathode（Vo-）, linear optical coupling（U4）The end of output two between be connected with the first capacitance one by one
（C111）, the first capacitance one by one（C111）One end connect third transistor（Q3）Base stage, the first capacitance one by one（C111）'s
The other end is grounded, third transistor（Q3）Collector pass through the 16th B resistance（R16B）It connects PFC power factor (PF)s and adjusts chip
（U1）The ends VCC, third transistor（Q3）Collector and base stage between connect the 16th A resistance（R16A）, third transistor
（Q3）Emitter ground connection, third transistor（Q3）Base stage and ground between connect the 16th C resistance（R16C）.
2. a kind of PFC constant-current driving power supply circuits of double protections according to claim 1, it is characterized in that：The PFC power
Factor adjusts chip（U1）It is as follows with the physical circuit connection structure of peripheral circuit：The PFC power factor (PF)s adjust chip（U1）
It is model L6562, and PFC power factor (PF)s adjust chip（U1）GD feet pass through the 17th resistance（R17）Connect field-effect tube
（Q1）G feet, field-effect tube（Q1）S feet pass through the 20th resistance（R20）Ground connection, PFC power factor (PF)s adjust chip（U1）'s
The ends GS pass through the 19th resistance（R19）Connect field-effect tube（Q1）S feet, field-effect tube（Q1）S feet and the 19th resistance
（R19）Common end and field-effect tube（Q1）G feet between be connected with the 18th resistance（R18）, PFC power factor (PF)s adjusting chip
（U1）The ends GS and ground between be connected with the 17th capacitance（C17）, the 17th capacitance（C17）With the 19th resistance（R19）
Common end pass through the 50th resistance（R50）Connect input rectifying filter unit（1）Output cathode end E, the 17th resistance
（R17）On be parallel with anode connection field-effect tube（Q1）The 14th diode（D14）, PFC power factor (PF)s adjusting chip（U1）
The ends ZCD and ground between be connected with the 16th capacitance（C16）, PFC power factor (PF)s adjusting chip（U1）The ends ZCD pass through the 16th
Resistance（R16）Connect high frequency transformer（T1）6 feet, field-effect tube（Q1）D feet connect high frequency transformer（T1）3 feet, PFC
Power factor (PF) adjusts chip（U1）COMP feet and PFC power factor (PF)s adjust chip（U1）INV between be connected with concatenated
13 capacitances（C13）With the 8th resistance（R8）, and the 13rd capacitance（C13）With the 8th resistance（R8）On be parallel with the 14th capacitance
（C14）, PFC power factor (PF)s adjusting chip（U1）INV feet and ground between be in series with the 9th resistance（R9）With the tenth resistance
（R10）, in the tenth resistance（R10）On be parallel with the 18th capacitance（C18）, the tenth resistance（R10）With the 9th resistance（R9）Public affairs
End connection constant current output sampling unit altogether（5）Feedback end, PFC power factor (PF)s adjust chip（U1）MULT feet pass through it is concatenated
3rd resistor（R3）With the 4th resistance（R4）Connect input rectifying filter unit（1）Output cathode end E, PFC power factor (PF) tune
Save chip（U1）INV feet pass through concatenated 4th diode（D4）, twelfth resistor（R12）Ground connection, the 4th diode（D4）、
Twelfth resistor（R12）Common end pass through concatenated eleventh resistor（R11）With the second diode（D2）Connect high frequency transformation
Device（T1）6 feet, and the second diode（D2）Anode connection high frequency transformer（T1）6 feet, the second diode（D2）It is negative
Pole also passes through thirteenth resistor（R13）Connect the second NPN triode（Q2）Collector, the second NPN triode（Q2）Transmitting
Pole passes through concatenated third diode（D3）And third capacitance（C3）Ground connection, the second NPN triode（Q2）Base stage pass through
One zener diode（ZD1）Ground connection, the second NPN triode（Q2）Emitter and ground between be connected with the second capacitance（C2）, the
Two NPN triodes（Q2）Emitter and the second NPN triode（Q2）Base stage be connected with the 14th resistance（R14）, field-effect
Pipe（Q1）D feet and input rectifying filter unit（1）Output cathode end E between be in series with the first diode（D1）With the 15th
Capacitance（C15）, the 15th capacitance（C15）On be parallel with by two groups respectively with concatenated branch again after two resistor coupled in parallel, high frequency
Transformer（T1）1 foot and input rectifying filter unit（1）The E connections of output cathode end, PFC power factor (PF)s adjust chip（U1）
MULT feet and ground between be connected with by the 5th resistance（R5）, the 11st capacitance（C11）, the second voltage-stabiliser tube（ZD4）Parallel connection is constituted
Circuit, third diode（D3）And third capacitance（C3）Public termination supply voltage VCC1, PFC power factor (PF) adjust core
Piece（U1）8 feet meet supply voltage VCC1.
3. a kind of PFC constant-current driving power supply circuits of double protections according to claim 2, it is characterized in that：The constant current is defeated
Go out sampling unit（5）Double feedback operational amplifiers including model TSM103（U5）, linear optical coupling（U2）And peripheral circuit, institute
State double feedback operational amplifiers（U5）1 foot connect the 12nd common anode switching diode（D12）A negative pole end, the 12nd is total
Positive switching diode（D12）Another negative pole end pass through the 45th resistance（R45）The double feedback operational amplifiers of connection（U5）
7 feet, the 12nd common anode switching diode（D12）Positive terminal connect linear optical coupling（U2）Light emitting diode cathode, linearly
Optocoupler（U2）Light emitting diode anode connect supply voltage VCC2, linear optical coupling（U2）Transistor collector connection power supply
Voltage VCC1, linear optical coupling（U2）Transistor emitter connect the tenth resistance（R10）With the 9th resistance（R9）Common end, institute
State double feedback operational amplifiers（U5）2 feet and double feedback operational amplifiers（U5）1 foot between be in series with the three or four resistance
（R34）With the 25th capacitance（C25）, double feedback operational amplifiers（U5）2 feet with output filter unit（3）In filter
Wave output cathode is connected with bleeder circuit between end（7）, the bleeder circuit（7）Including being connected on output filter unit（3）In
Output end and ground between the 31st resistance（R31）With the 33rd resistance（R33）And it is connected in parallel on the 33rd resistance
（R33）On the 32nd resistance（R32）It constitutes, double feedback operational amplifiers（U5）2 feet partial pressure obtain the 33rd
Resistance（R33）On voltage, double feedback operational amplifiers（U5）3 feet and supply voltage VCC2 between be in series with the 46th electricity
Resistance（R46）, double feedback operational amplifiers（U5）5 feet and double feedback operational amplifiers（U5）3 feet between be in series with the 30th
Nine resistance（R39）With the 24th resistance（R24）, the 39th resistance（R39）With the 24th resistance（R24）Common end with
The 38th resistance is connected between ground（R38）, double feedback operational amplifiers（U5）6 feet with output filter unit（3）In
Filtering output negative pole is connected with the 41st resistance between end（R41）, double feedback operational amplifiers（U5）6 feet transported with double feedbacks
Defeated amplifier（U5）7 feet between be in series with the 26th capacitance（C26）With the 40th resistance（R40）, double feedback transport amplifications
Device（U5）8 feet connect supply voltage VCC2, double feedback operational amplifiers（U5）3 feet and double feedback operational amplifiers（U5）4
The 28th capacitance is connected between foot（C28）.
4. a kind of PFC constant-current driving power supply circuits of double protections according to claim 3, it is characterized in that：The output filter
Wave unit（3）It is included in high frequency transformer（T1）Secondary output winding between 4 filter capacitors in parallel（E1）, filtering
Capacitance（E1）On be parallel with the 43rd resistance（R43）, filter capacitor（E1）Positive terminal and the 31st resistance（R31）Even
It connects, filter capacitor（E1）Negative pole end and high frequency transformer（T1）Output end between it is in parallel there are three common anode switching diode,
And the anode and filter capacitor of 3 common anode switching diodes（E1）Negative pole end connection, the cathode of 3 common anode switching diodes with
High frequency transformer（T1）Connection, be also parallel on 3 common anode switching diodes by after two resistor coupled in parallel again with a capacitance
Concatenated branch, the 31st resistance（R31）The other end connect the 4th inductance（L4）One end, filter capacitor（E1）Anode
Connect the 4th inductance（L4）Another foot, the 4th inductance（L4）Two feet connect output unit（4）, the 31st resistance（R31）
With the 4th inductance（L4）Common end connect the 41st resistance（R41）.
5. a kind of PFC constant-current driving power supply circuits of double protections according to claim 4, it is characterized in that：The high frequency becomes
Depressor（T1）3 feet, 6 feet, 7 feet and and filter capacitor（E1）The foot of positive terminal connection is Same Name of Ends.
6. a kind of control method of the PFC constant-current driving power supply circuits of double protections, described in any one of 1-5 claims
A kind of double protections PFC constant-current driving power supply circuits, it is characterized in that：Specifically comprise the steps of：
S1, preferred output are first by constant current output sampling unit（5）Output filter unit is obtained in real time（3）Output current feedback
Feedback signal is conveyed to PFC power factor correction units by signal by linear isolation optocoupler（2）, PFC PFC lists
Member（2）Active PFC is carried out according to the variation of output current, finally controls output constant current；
S2, secondly pass through safe secondary protection circuit in real time（6）To output module（4）Second class protection is carried out, it is defeated when output short-circuit
It is 0 to go out, at this time safe secondary protection circuit（6）Drag down PFC power factor correction units（2）Supply voltage, so that it is not worked with this
It plays a protective role, prevents from burning out component.
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| CN109256761A (en) * | 2018-09-30 | 2019-01-22 | 惠州三华工业有限公司 | Dual overvoltage crowbar and overvoltage protective system |
| CN110312347A (en) * | 2019-08-02 | 2019-10-08 | 厦门亚锝电子科技有限公司 | A kind of constant current constant voltage LED drive circuit |
| CN110492730A (en) * | 2019-09-20 | 2019-11-22 | 上海圣哲医疗科技有限公司 | A kind of medical treatment power circuit |
| CN111245227A (en) * | 2020-03-25 | 2020-06-05 | 美的集团股份有限公司 | Power supply circuit, circuit board and vehicle-mounted air conditioner |
| CN113258922A (en) * | 2021-06-16 | 2021-08-13 | 上海芯龙半导体技术股份有限公司南京分公司 | Drive circuit and power supply system |
| CN116317032A (en) * | 2023-05-17 | 2023-06-23 | 中国人民解放军国防科技大学 | Faraday capacitor electric energy constant power storage and release control method |
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| CN113258922A (en) * | 2021-06-16 | 2021-08-13 | 上海芯龙半导体技术股份有限公司南京分公司 | Drive circuit and power supply system |
| CN113258922B (en) * | 2021-06-16 | 2021-10-08 | 上海芯龙半导体技术股份有限公司南京分公司 | Drive circuit and power supply system |
| CN116317032A (en) * | 2023-05-17 | 2023-06-23 | 中国人民解放军国防科技大学 | Faraday capacitor electric energy constant power storage and release control method |
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