CN104199505A - Overpower compensation circuit and PFC overpower compensation circuit structure - Google Patents
Overpower compensation circuit and PFC overpower compensation circuit structure Download PDFInfo
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- CN104199505A CN104199505A CN201410416453.2A CN201410416453A CN104199505A CN 104199505 A CN104199505 A CN 104199505A CN 201410416453 A CN201410416453 A CN 201410416453A CN 104199505 A CN104199505 A CN 104199505A
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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
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
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Abstract
The invention relates to the technical field of power factor correcting circuits, in particular to an overpower compensation circuit and a PFC overpower compensation circuit structure. The overpower compensation circuit comprises a resistor voltage division circuit and a Wilson current source circuit. The power input end of the resistor voltage division circuit is connected with an input power end, and the power output end of the resistor voltage division circuit is connected with the voltage input end of the Wilson current source circuit. The current output end of the Wilson current source circuit is connected with an overpower protection pin of a power factor correcting chip of the power factor correcting circuit. The circuit determines the output current of the Wilson current source circuit according to input voltage, then a voltage compensation value is determined, the balance of output power of an overpower point of the power factor correcting circuit is effectively controlled when low voltage and high voltage are input, it is only required that electronic elements and components common in performance and specification and low in cost are selected for use, and then normal working of the PFC circuit can be kept.
Description
Technical field
The present invention relates to power factor correction circuit technical field, relate in particular to a kind of Overpower compensating circuit and PFC Overpower compensating circuit structure.
Background technology
In prior art, the PFC (Power Factor Correction, power factor correction) of CRM pattern (Critical Conduction Mode, critical conduction mode) controls IC (Integrated Circuit, integrated circuit) general mode that adopts fixing protection magnitude of voltage in the time of overpower protection.Please refer to Fig. 1, it is the circuit connection diagram of prior art power factor correction circuit.This power factor correction circuit; be the Active PFC chip U1 that pfc circuit adopts model NCP1608B; the working value of the overpower protection pin CS pin of this Active PFC chip U1 is 0.5V; the resistance of supposing overcurrent sampling resistor R4 is 0.1 Ω, and the peak inrush current that flows through inductance L 1 is:
I
LK＝V
CS/R
4＝0.5V/0.1Ω＝5A………………………………………(1)
The peak point current that flows through inductance L 1 can also be determined by following formula,
I
LK＝2·2
1/2·P
out/η·V
AC………………………………………………(2)
Wherein P
outfor the output power of pfc circuit, the conversion efficiency that η is pfc circuit, value is 0.92, V
aCfor ac input voltage.
Can calculate in conjunction with formula 1 and formula 2, in the time that 100VAC voltage is inputted, the peak power output of pfc circuit is 162W; In the time that 240VAC voltage is inputted, the peak power output of pfc circuit is 390W.Visible pfc circuit for different input voltages to there being different output powers.The increasing degree of output power is far longer than the increasing degree of corresponding input voltage.In the time that high voltage is inputted, the output power of overpower point is larger.So, the performance requirement of overpower protection while input for meet low-voltage input and high voltage simultaneously, pfc circuit often needs to select specification stronger, and the device that cost is higher is to maintain the normal work of this circuit, thereby caused the waste of electronic devices and components.
Summary of the invention
The object of the invention is to propose a kind of Overpower compensating circuit and PFC Overpower compensating circuit structure, can make the increasing degree of pfc circuit corresponding output power in the time of low-voltage input and high voltage input be less than the increasing degree of corresponding input voltage, only need to select specification general, lower-cost electronic devices and components just can maintain the normal work of pfc circuit.
For reaching this object, the present invention by the following technical solutions:
First aspect, a kind of Overpower compensating circuit is provided, comprise resistor voltage divider circuit and Wilson's current source circuit, the power input of resistor voltage divider circuit connects input supply terminal, the power output end of resistor voltage divider circuit connects the voltage input end of Wilson's current source circuit, and the current output terminal of Wilson's current source circuit connects the overpower protection pin of the Active PFC chip of power factor correction circuit; Input power is inputted Wilson's current source circuit after the dividing potential drop of resistor voltage divider circuit, and the output current of Wilson's current source circuit is inputted described overpower protection pin, and output current and the input voltage of Wilson's current source circuit are linear.
Wherein, described resistor voltage divider circuit comprises resistance R 16, R15, R12 and R13, the power input of one end contact resistance bleeder circuit of described resistance R 16, one end of the other end contact resistance R15 of resistance R 16, one end of the other end contact resistance R12 of resistance R 15, one end of the other end difference contact resistance R13 of resistance R 12, the power output end of resistor voltage divider circuit, the other end of resistance R 13 connects digitally end.
Wherein, the resistance that the resistance that described resistance R 16 is 560K Ω, the resistance that resistance R 15 is 560K Ω, resistance R 12 are 560K Ω, the resistance that resistance R 13 is 39K Ω.
Wherein, described resistor voltage divider circuit also comprises capacitor C 9, one end of one end contact resistance R13 of described capacitor C 9, the other end of the other end contact resistance R13 of capacitor C 9.
Wherein, described capacitor C 9 is the electric capacity of model 225.
Wherein, described Wilson's current source circuit comprises PNP triode Q2, PNP triode Q3, PNP triode Q4 and resistance R 14, the emitter of described PNP triode Q2 connects respectively the voltage input end of Wilson's current source circuit, the emitter of PNP triode Q3, the base stage of described PNP triode Q2 connects respectively the base stage of PNP triode Q3, the collector of PNP triode Q3, the emitter of PNP triode Q4, the collector of described PNP triode Q2 is one end of contact resistance R14 respectively, the base stage of PNP triode Q4, the other end of resistance R 14 connects digitally end, the collector of PNP triode Q4 connects the current output terminal of Wilson's current source circuit.
Wherein, the PNP triode that described PNP triode Q2 is model 2N3906, PNP triode, the PNP triode Q4 that PNP triode Q3 is model 2N3906 are the PNP triode of model 2N3906, and resistance R 14 is the resistance of 4.7K Ω.
Wherein, between the voltage input end of described Wilson's current source circuit and the power output end of resistor voltage divider circuit, connect the diode D2 of model 1N4148, the negative pole of described diode D2 connects the voltage input end of Wilson's current source circuit, the power output end of the anodal contact resistance bleeder circuit of described diode D2.
Second aspect, provides a kind of PFC Overpower compensating circuit structure, comprises power factor correction circuit and above-mentioned Overpower compensating circuit.
Wherein, described power factor correction circuit comprises Active PFC chip U1, capacitor C 1, C2, C3, C4, C5, C6, C7, C8, resistance R 1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, field effect transistor Q1, inductance L 1 and the diode D1 of model NCP1608B, the 1st pin of described Active PFC chip U1 connects respectively one end of capacitor C 8, one end of resistance R 8, one end of resistance R 7, the other end of capacitor C 8, the other end of resistance R 8 connect respectively digitally end, one end of the other end contact resistance R6 of resistance R 7, one end of the other end contact resistance R5 of resistance R 6, the 2nd pin of described Active PFC chip U1 connects respectively one end of capacitor C 4, one end of resistance R 10, the other end of capacitor C 4 connects digitally end, the other end of resistance R 10 connects one end of capacitor C 6, the other end of capacitor C 6 connects digitally end, the 3rd pin of described Active PFC chip U1 connects one end of capacitor C 3, one end of the other end contact resistance R9 of capacitor C 3, the other end of resistance R 9 connects digitally end, the 4th pin of described Active PFC chip U1 connects respectively one end of capacitor C 7, one end of resistance R 11, the 4th pin of Active PFC chip U1 is overpower protection pin, described overpower protection pin connects the current output terminal of Wilson's current source circuit, the other end of capacitor C 7 connects digitally end, the other end of resistance R 11 is one end of contact resistance R4 respectively, the source electrode of field effect transistor Q1, the other end of resistance R 4 connects digitally end, one end of the 5th pin contact resistance R1 of described Active PFC chip U1, the other end of resistance R 1 connects one end of the first inductive coil of inductance L 1, the other end of the first inductive coil of inductance L 1 connects digitally end, the 6th pin of described Active PFC chip U1 connects digitally end, one end of the 7th pin contact resistance R2 of described Active PFC chip U1, the other end of resistance R 2 connects respectively the grid of field effect transistor Q1, one end of resistance R 3, the other end of resistance R 3 connects digitally end, the 8th pin of described Active PFC chip U1 connects respectively the power supply input VCC_PFC end of power factor correction circuit, one end of capacitor C 5, the other end of capacitor C 5 connects digitally end, the other end of resistance R 5 connects respectively the power supply output PFC_Vout end of power factor correction circuit, the positive pole of capacitor C 2, the negative pole of diode D1, the negative pole of capacitor C 2 connects digitally end, the positive pole of diode D1 connects respectively one end of the second inductive coil of inductance L 1, the drain electrode of field effect transistor Q1, the other end of the second inductive coil of inductance L 1 connects respectively input supply terminal, one end of capacitor C 1, the other end of capacitor C 1 connects digitally end.
Beneficial effect of the present invention is: a kind of Overpower compensating circuit and PFC Overpower compensating circuit structure, comprise resistor voltage divider circuit and Wilson's current source circuit, the power input of resistor voltage divider circuit connects input supply terminal, the power output end of resistor voltage divider circuit connects the voltage input end of Wilson's current source circuit, and the current output terminal of Wilson's current source circuit connects the overpower protection pin of the Active PFC chip of power factor correction circuit; Input power is inputted Wilson's current source circuit after the dividing potential drop of resistor voltage divider circuit, and the output current of Wilson's current source circuit is inputted described overpower protection pin, and output current and the input voltage of Wilson's current source circuit are linear.This Overpower compensating circuit is using input voltage as feed-forward signal source; control the linear output current of the output of Wilson's current source circuit and input voltage; this output current flows through compensating resistance R11, by compensating resistance R11, the control voltage of overpower protection pin CS pin is done to corresponding compensation.The operation voltage V of overcurrent sampling resistor R4
r4equal (V
cS-V
r11), when input voltage increases, the output current of Wilson's current source circuit also increases, V
r11also corresponding increase, V
r4decline, the overpower point output power of pfc circuit also declines.This circuit determines the output current size of Wilson's current source circuit according to the size of input voltage, further determine the size of voltage compensation value, the balance of the output power of the overpower point of power factor correction circuit while effectively having controlled low-voltage input and high voltage input.Visible, this Overpower compensating circuit and PFC Overpower compensating circuit structure, can make the increasing degree of pfc circuit corresponding output power in the time of low-voltage input and high voltage input be less than the increasing degree of corresponding input voltage, only need to select specification general, lower-cost electronic devices and components just can maintain the normal work of pfc circuit.
Brief description of the drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing of required use during the embodiment of the present invention is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to the content of the embodiment of the present invention and these accompanying drawings other accompanying drawing.
Fig. 1 is the circuit connection diagram of prior art power factor correction circuit.
Fig. 2 is the circuit connection diagram of PFC Overpower compensating circuit structure provided by the invention.
Embodiment
For the technical scheme of technical matters that the present invention is solved, employing and the technique effect that reaches clearer, below in conjunction with accompanying drawing, the technical scheme of the embodiment of the present invention is described in further detail, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those skilled in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 2, it is the circuit connection diagram of PFC Overpower compensating circuit structure provided by the invention.
A kind of Overpower compensating circuit, comprise resistor voltage divider circuit and Wilson's current source circuit, the power input of resistor voltage divider circuit connects input supply terminal, the power output end of resistor voltage divider circuit connects the voltage input end of Wilson's current source circuit, and the current output terminal of Wilson's current source circuit connects the overpower protection pin of the Active PFC chip of power factor correction circuit; Input power is inputted Wilson's current source circuit after the dividing potential drop of resistor voltage divider circuit, and the output current of Wilson's current source circuit is inputted described overpower protection pin, and output current and the input voltage of Wilson's current source circuit are linear.
In the present embodiment, the model of Active PFC chip is NCP1608B; Certainly, the technical program also can adopt the Active PFC chip of existing other models.
This Overpower compensating circuit is using input voltage as feed-forward signal source; control the linear output current of the output of Wilson's current source circuit and input voltage; this output current flows through compensating resistance R11, by compensating resistance R11, the control voltage of overpower protection pin CS pin is done to corresponding compensation.The operation voltage V of overcurrent sampling resistor R4
r4equal (V
cS-V
r11), when input voltage increases, the output current of Wilson's current source circuit also increases, V
r11also corresponding increase, V
r4decline, the overpower point output power of pfc circuit also declines.This circuit determines the output current size of Wilson's current source circuit according to the size of input voltage, further determine the size of voltage compensation value, the balance of the output power of the overpower point of power factor correction circuit while effectively having controlled low-voltage input and high voltage input.Visible, this Overpower compensating circuit, can make the increasing degree of pfc circuit corresponding output power in the time of low-voltage input and high voltage input be less than the increasing degree of corresponding input voltage, only need to select specification general, lower-cost electronic devices and components just can maintain the normal work of pfc circuit.
Wherein, described resistor voltage divider circuit comprises resistance R 16, R15, R12 and R13, the power input of one end contact resistance bleeder circuit of described resistance R 16, one end of the other end contact resistance R15 of resistance R 16, one end of the other end contact resistance R12 of resistance R 15, one end of the other end difference contact resistance R13 of resistance R 12, the power output end of resistor voltage divider circuit, the other end of resistance R 13 connects digitally end.
Wherein, the resistance that the resistance that described resistance R 16 is 560K Ω, the resistance that resistance R 15 is 560K Ω, resistance R 12 are 560K Ω, the resistance that resistance R 13 is 39K Ω.
Input voltage equal proportion is lowered into the convenient low-voltage of utilizing by described resistor voltage divider circuit.Certainly, those skilled in the art can also, according to common practise, under the technical background of the technical program, select the electronic devices and components of other forms of resistor voltage divider circuit and other parameters to realize a point compression functions, repeat no longer for example herein.
Wherein, described resistor voltage divider circuit also comprises capacitor C 9, one end of one end contact resistance R13 of described capacitor C 9, the other end of the other end contact resistance R13 of capacitor C 9.
Wherein, described capacitor C 9 is the electric capacity of model 225.
Described capacitor C 9 realizes filter function, and the alternating component being mingled in direct current is filtered out.After filtering, alternating component is all passed through electric capacity and is returned to input end, and what electric capacity both sides were remaining is exactly the pure direct current not fluctuating.The capacitance of the electric capacity of model 225 is 22 × 10
5pF=2.2uF.
Wherein, described Wilson's current source circuit comprises PNP triode Q2, PNP triode Q3, PNP triode Q4 and resistance R 14, the emitter of described PNP triode Q2 connects respectively the voltage input end of Wilson's current source circuit, the emitter of PNP triode Q3, the base stage of described PNP triode Q2 connects respectively the base stage of PNP triode Q3, the collector of PNP triode Q3, the emitter of PNP triode Q4, the collector of described PNP triode Q2 is one end of contact resistance R14 respectively, the base stage of PNP triode Q4, the other end of resistance R 14 connects digitally end, the collector of PNP triode Q4 connects the current output terminal of Wilson's current source circuit.
Wherein, the PNP triode that described PNP triode Q2 is model 2N3906, PNP triode, the PNP triode Q4 that PNP triode Q3 is model 2N3906 are the PNP triode of model 2N3906, and resistance R 14 is the resistance of 4.7K Ω.
Wilson's current source circuit converts input voltage to constant current source output, utilizes the characteristic of positive-negative-positive triode, just can obtain and more approach desirable constant current source when positive-negative-positive triode is operated on suitable working point.
Wherein, between the voltage input end of described Wilson's current source circuit and the power output end of resistor voltage divider circuit, connect the diode D2 of model 1N4148, the negative pole of described diode D2 connects the voltage input end of Wilson's current source circuit, the power output end of the anodal contact resistance bleeder circuit of described diode D2.
Diode D2 isolation resistance bleeder circuit and Wilson's current source circuit, the electric current that prevents Wilson's current source circuit pours in down a chimney into resistor voltage divider circuit and damages resistor voltage divider circuit.Diode D2 also can play certain dividing potential drop effect simultaneously, and the diode D2 of model 1N4148 has the pressure reduction of 0.7V.
A kind of PFC Overpower compensating circuit structure, comprises power factor correction circuit and above-mentioned Overpower compensating circuit.
Wherein, described power factor correction circuit comprises Active PFC chip U1, capacitor C 1, C2, C3, C4, C5, C6, C7, C8, resistance R 1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, field effect transistor Q1, inductance L 1 and the diode D1 of model NCP1608B, the 1st pin of described Active PFC chip U1 connects respectively one end of capacitor C 8, one end of resistance R 8, one end of resistance R 7, the other end of capacitor C 8, the other end of resistance R 8 connect respectively digitally end, one end of the other end contact resistance R6 of resistance R 7, one end of the other end contact resistance R5 of resistance R 6, the 2nd pin of described Active PFC chip U1 connects respectively one end of capacitor C 4, one end of resistance R 10, the other end of capacitor C 4 connects digitally end, the other end of resistance R 10 connects one end of capacitor C 6, the other end of capacitor C 6 connects digitally end, the 3rd pin of described Active PFC chip U1 connects one end of capacitor C 3, one end of the other end contact resistance R9 of capacitor C 3, the other end of resistance R 9 connects digitally end, the 4th pin of described Active PFC chip U1 connects respectively one end of capacitor C 7, one end of resistance R 11, the 4th pin of Active PFC chip U1 is overpower protection pin, described overpower protection pin connects the current output terminal of Wilson's current source circuit, the other end of capacitor C 7 connects digitally end, the other end of resistance R 11 is one end of contact resistance R4 respectively, the source electrode of field effect transistor Q1, the other end of resistance R 4 connects digitally end, one end of the 5th pin contact resistance R1 of described Active PFC chip U1, the other end of resistance R 1 connects one end of the first inductive coil of inductance L 1, the other end of the first inductive coil of inductance L 1 connects digitally end, the 6th pin of described Active PFC chip U1 connects digitally end, one end of the 7th pin contact resistance R2 of described Active PFC chip U1, the other end of resistance R 2 connects respectively the grid of field effect transistor Q1, one end of resistance R 3, the other end of resistance R 3 connects digitally end, the 8th pin of described Active PFC chip U1 connects respectively the power supply input VCC_PFC end of power factor correction circuit, one end of capacitor C 5, the other end of capacitor C 5 connects digitally end, the other end of resistance R 5 connects respectively the power supply output PFC_Vout end of power factor correction circuit, the positive pole of capacitor C 2, the negative pole of diode D1, the negative pole of capacitor C 2 connects digitally end, the positive pole of diode D1 connects respectively one end of the second inductive coil of inductance L 1, the drain electrode of field effect transistor Q1, the other end of the second inductive coil of inductance L 1 connects respectively input supply terminal, one end of capacitor C 1, the other end of capacitor C 1 connects digitally end.
Wherein, resistance, resistance R 4 that the resistance that described resistance R 1 is 51K Ω, the resistance that resistance R 2 is 62 Ω, resistance R 3 are 10K Ω are the resistance of 0.1 Ω, resistance R 5 is the resistance of 1.5M Ω, the resistance that resistance R 6 is 1.5M Ω, the resistance that resistance R 7 is 1.5M Ω, the resistance that resistance R 8 is 30K Ω, and resistance R 9 is the resistance of 330 Ω, the resistance that resistance R 10 is 22K Ω, the resistance that resistance R 11 is 4.7K Ω.
Wherein, described capacitor C 1 is the electric capacity of model 474, the electric capacity that capacitor C 2 is 100uF, capacitor C 3 is the electric capacity of model 222, capacitor C 4 is the electric capacity of model 224, and capacitor C 5 is the electric capacity of model 225, and capacitor C 6 is the electric capacity of model 105, capacitor C 7 is the electric capacity of model 101, and capacitor C 8 is the electric capacity of model 102.
The capacitance of the electric capacity of model 474 is 0.47uF.The capacitance of the electric capacity of model 222 is 2200 PF.The capacitance of the electric capacity of model 224 is 0.22uF.The capacitance of the electric capacity of model 105 is 1uF.The capacitance of the electric capacity of model 101 is 100PF.The capacitance of the electric capacity of model 102 is 1000pF.
The principle Analysis of this PFC Overpower compensating circuit structure is as follows:
The voltage Vin of input resistance bleeder circuit is the positive half-wave sine wave after full-bridge rectification, and this voltage Vin is after electric resistance partial pressure and capacitor C 9 filtering, and resistance R 13 both end voltage are the DC voltage V after dividing potential drop
13,
V
13＝V
in·R
13/(R
16+R
15+R
12+R
13)………………………………………(3)
Wherein, V
in=V
aC0.92
1/2(4)
Wherein, V
aCfor input ac voltage.
Three PNP triode performances of Wilson's current source circuit are identical, β
2=β
3=β
4=β, I
c2=I
c3=I
c,
As can be seen from Figure 2, V
3for the input voltage of Wilson's current source circuit, I
11for the output current of Wilson's current source circuit, the current equation that in Fig. 2, A is ordered is:
I
E4＝I
C+2I
B＝I
C+2I
C/β………………………………………………(5)
,
I
C＝I
E4·β/(β+2)＝{β/(β+2)}·{(1+β)/β}·I
11＝I
11·(β+1)/(β+2)
…………………………(6)
The current equation that in Fig. 2, B is ordered is:
I
14＝I
B4+I
C＝I
11/β+I
11·(β+1)/(β+2)＝I
11·(β
2+2β+2)/(β
2+2β)
…………………………(7)
Arrangement can obtain: I
11=I
14{ 1-2/ (β
2+ 2 β+2) } ≈ I
14(8)
Because β is much larger than 10 times, so 2/ (β
2+ 2 β+2) infinite approach 0,
Can obtain I from formula 8
11infinite approach I
14.
I
11≈I
14＝(V
3-V
CE3-V
EB4)/R
14＝(V
3-V
EB3-V
EB4)/R
14＝(V
3-0.7V-0.7V)/4.7k
…………………………(9)
By formula 9 substitution V
13=V
3+ V
d2can obtain: V
13=(4.7kI
11+ 2.1) V ... (10)
Again because: I
1=I
2+ I
3(11)
Wherein:
I
1＝(V
in-V
13)/(R
16+R
15+R
12)＝{V
in-(4.7k·I
11+2.1)}/1680k……………(12)
I
2＝V
13/R
13＝(4.7k·I
11+2.1)/39k……………………………………………(13)
I
3＝2I
11……………………………………………(14)
Formula 12, formula 13 and formula 14 substitution formula 11 can be obtained:
I
11＝0.28μA·V
in-26μA……………………………………………(15)
Can draw the output current I of Wilson's current source circuit according to formula 15
11linear with the voltage Vin of input resistance bleeder circuit.Be that input voltage is larger, the output current of Wilson's current source circuit is larger, and the voltage compensation of the overpower protection pin CS pin of the Active PFC chip to power factor correction circuit is more.
Example: when input voltage is 240VAC, Vin ≈ 240 × 0.9 × 2
1/2=305V, substitution formula 15 can calculate I
11=59 μ A.Now the voltage of the overpower check point of overcurrent sampling resistor R4 is:
V
R4＝V
CS－I
11·(R
11+R
4)＝0.223V；
The peak inrush current that flows through inductance L 1 is: I
lK=V
r4/ R
4=0.223V/0.1 Ω=2.23A;
This value substitution formula 2 can be drawn: P
out=174W.
When should input voltage being 100VAC, can calculate the output power P of overpower check point
out=148W.Compare in the situation that there is no input voltage feed forward compensation in the prior art of mentioning in background technology, the output power of the overpower check point of this PFC Overpower compensating circuit structure is more approaching, the balance of the output power of overpower point while effectively having controlled low-voltage input and high voltage input.
This PFC Overpower compensating circuit structure, has effectively solved pfc circuit in the situation that there is no front feedback voltage compensation, and the overpower point of different input voltages differs large and generally causes the problem of electronic devices and components cost waste.By this circuit structure, input voltage is differed in the situation of 2.4 times, Maximum Power Output only differs 1.17 times, and the requirement of Electronic Components reduces, and electronic devices and components cost also declines accordingly.
This PFC Overpower compensating circuit structure, compensates the output overpower point of pfc circuit by the input voltage feed forward circuit of external potential-divider network and Wilson's current source circuit composition, makes the overpower point of pfc circuit in the situation that of different input voltage close.
A kind of Overpower compensating circuit and PFC Overpower compensating circuit structure, can make the increasing degree of pfc circuit corresponding output power in the time of low-voltage input and high voltage input be less than the increasing degree of corresponding input voltage, only need to select specification general, lower-cost electronic devices and components just can maintain the normal work of pfc circuit.
Above content is only preferred embodiment of the present invention, for those of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, and this description should not be construed as limitation of the present invention.
Claims (10)
1. an Overpower compensating circuit, it is characterized in that, comprise resistor voltage divider circuit and Wilson's current source circuit, the power input of resistor voltage divider circuit connects input supply terminal, the power output end of resistor voltage divider circuit connects the voltage input end of Wilson's current source circuit, and the current output terminal of Wilson's current source circuit connects the overpower protection pin of the Active PFC chip of power factor correction circuit; Input power is inputted Wilson's current source circuit after the dividing potential drop of resistor voltage divider circuit, and the output current of Wilson's current source circuit is inputted described overpower protection pin, and output current and the input voltage of Wilson's current source circuit are linear.
2. Overpower compensating circuit according to claim 1, it is characterized in that, described resistor voltage divider circuit comprises resistance R 16, R15, R12 and R13, the power input of one end contact resistance bleeder circuit of described resistance R 16, one end of the other end contact resistance R15 of resistance R 16, one end of the other end contact resistance R12 of resistance R 15, one end of the other end difference contact resistance R13 of resistance R 12, the power output end of resistor voltage divider circuit, the other end of resistance R 13 connects digitally end.
3. Overpower compensating circuit according to claim 2, is characterized in that, the resistance that the resistance that described resistance R 16 is 560K Ω, the resistance that resistance R 15 is 560K Ω, resistance R 12 are 560K Ω, the resistance that resistance R 13 is 39K Ω.
4. Overpower compensating circuit according to claim 2, is characterized in that, described resistor voltage divider circuit also comprises capacitor C 9, one end of one end contact resistance R13 of described capacitor C 9, the other end of the other end contact resistance R13 of capacitor C 9.
5. Overpower compensating circuit according to claim 4, is characterized in that, described capacitor C 9 is the electric capacity of model 225.
6. Overpower compensating circuit according to claim 1, it is characterized in that, described Wilson's current source circuit comprises PNP triode Q2, PNP triode Q3, PNP triode Q4 and resistance R 14, the emitter of described PNP triode Q2 connects respectively the voltage input end of Wilson's current source circuit, the emitter of PNP triode Q3, the base stage of described PNP triode Q2 connects respectively the base stage of PNP triode Q3, the collector of PNP triode Q3, the emitter of PNP triode Q4, the collector of described PNP triode Q2 is one end of contact resistance R14 respectively, the base stage of PNP triode Q4, the other end of resistance R 14 connects digitally end, the collector of PNP triode Q4 connects the current output terminal of Wilson's current source circuit.
7. Overpower compensating circuit according to claim 6, it is characterized in that, the PNP triode that described PNP triode Q2 is model 2N3906, PNP triode, the PNP triode Q4 that PNP triode Q3 is model 2N3906 are the PNP triode of model 2N3906, and resistance R 14 is the resistance of 4.7K Ω.
8. Overpower compensating circuit according to claim 1, it is characterized in that, between the voltage input end of described Wilson's current source circuit and the power output end of resistor voltage divider circuit, connect the diode D2 of model 1N4148, the negative pole of described diode D2 connects the voltage input end of Wilson's current source circuit, the power output end of the anodal contact resistance bleeder circuit of described diode D2.
9. a PFC Overpower compensating circuit structure, is characterized in that, comprises power factor correction circuit and the Overpower compensating circuit as described in claim 1～8 any one.
10. PFC Overpower compensating circuit structure according to claim 9, it is characterized in that, described power factor correction circuit comprises Active PFC chip U1, capacitor C 1, C2, C3, C4, C5, C6, C7, C8, resistance R 1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, field effect transistor Q1, inductance L 1 and the diode D1 of model NCP1608B, the 1st pin of described Active PFC chip U1 connects respectively one end of capacitor C 8, one end of resistance R 8, one end of resistance R 7, the other end of capacitor C 8, the other end of resistance R 8 connect respectively digitally end, one end of the other end contact resistance R6 of resistance R 7, one end of the other end contact resistance R5 of resistance R 6, the 2nd pin of described Active PFC chip U1 connects respectively one end of capacitor C 4, one end of resistance R 10, the other end of capacitor C 4 connects digitally end, the other end of resistance R 10 connects one end of capacitor C 6, the other end of capacitor C 6 connects digitally end, the 3rd pin of described Active PFC chip U1 connects one end of capacitor C 3, one end of the other end contact resistance R9 of capacitor C 3, the other end of resistance R 9 connects digitally end, the 4th pin of described Active PFC chip U1 connects respectively one end of capacitor C 7, one end of resistance R 11, the 4th pin of Active PFC chip U1 is overpower protection pin, described overpower protection pin connects the current output terminal of Wilson's current source circuit, the other end of capacitor C 7 connects digitally end, the other end of resistance R 11 is one end of contact resistance R4 respectively, the source electrode of field effect transistor Q1, the other end of resistance R 4 connects digitally end, one end of the 5th pin contact resistance R1 of described Active PFC chip U1, the other end of resistance R 1 connects one end of the first inductive coil of inductance L 1, the other end of the first inductive coil of inductance L 1 connects digitally end, the 6th pin of described Active PFC chip U1 connects digitally end, one end of the 7th pin contact resistance R2 of described Active PFC chip U1, the other end of resistance R 2 connects respectively the grid of field effect transistor Q1, one end of resistance R 3, the other end of resistance R 3 connects digitally end, the 8th pin of described Active PFC chip U1 connects respectively the power supply input VCC_PFC end of power factor correction circuit, one end of capacitor C 5, the other end of capacitor C 5 connects digitally end, the other end of resistance R 5 connects respectively the power supply output PFC_Vout end of power factor correction circuit, the positive pole of capacitor C 2, the negative pole of diode D1, the negative pole of capacitor C 2 connects digitally end, the positive pole of diode D1 connects respectively one end of the second inductive coil of inductance L 1, the drain electrode of field effect transistor Q1, the other end of the second inductive coil of inductance L 1 connects respectively input supply terminal, one end of capacitor C 1, the other end of capacitor C 1 connects digitally end.
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| CN201410416453.2A CN104199505B (en) | 2014-08-21 | 2014-08-21 | A kind of Overpower compensating circuit and PFC Overpower compensating circuit structure |
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Cited By (1)
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| CN104795983A (en) * | 2015-05-13 | 2015-07-22 | 成都启臣微电子有限公司 | Over-power compensation circuit for wide voltage power supply, control system and power supply |
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| CN104199505B (en) | 2016-07-06 |
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