CN102437735B - Switch power supply and divider therefor - Google Patents
Switch power supply and divider therefor Download PDFInfo
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- CN102437735B CN102437735B CN201110383939.7A CN201110383939A CN102437735B CN 102437735 B CN102437735 B CN 102437735B CN 201110383939 A CN201110383939 A CN 201110383939A CN 102437735 B CN102437735 B CN 102437735B
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Abstract
The invention discloses a divider for a switch power supply, which comprises four groups of bipolar transistor sets, wherein an output current and an input current of the divider have the following relationship Iout=I2*I3/I1, wherein it is supposed that I3/I1=n, I1 is a current signal corresponding a sampling signal of a linear voltage peak value signal, Iout_min=(n*I3/beta)m, Iout_max=(I3*(1-2/nbeta))m are obtained according to the relationship among a base current, a collector current and an emitter current of the bipolar transistor, wherein beta is an amplification factor of the bipolar transistor sets, and m is the cascade quantity of bipolar transistors in the bipolar transistor sets. Known from the expression of Iout_min and Iout_max, the higher the linear voltage is, the lower the n is, and the smaller the Iout_min and the Iout_max are, thus the divider for the switch power supply has a function of online compensation. Therefore, a linear voltage compensation circuit does not need to be additionally arranged in the switch power supply, circuit structure is simplified and cost is reduced.
Description
Technical field
The application relates to switch power technology field, and particularly relating to a kind of Switching Power Supply divider is Switching Power Supply.
Background technology
In Switching Power Supply; due to the existence of power switch pipe; there is turn off delay time in power switch pipe; there is error in the output voltage of Switching Power Supply; and the size of the line voltage of this error and input is proportional; conventionally can increase by a line voltage compensation circuit in the periphery of the control circuit of Switching Power Supply, while making Switching Power Supply input different line voltage, output current is consistent.
Traditional Switching Power Supply needs the extra line voltage compensation circuit that increases, circuit structure complexity, and cost is high, and compensate function is unstable.
Summary of the invention
For solving the problems of the technologies described above, the embodiment of the present application provides a kind of Switching Power Supply divider and Switching Power Supply, and this divider, except having the basic function of divider, also has line voltage compensation function, simplify circuit, cost-saving object to realize, technical scheme is as follows:
The invention provides a kind of Switching Power Supply divider, comprising: the first bipolar transistor set, the second bipolar transistor set, the 3rd bipolar transistor set and the 4th bipolar transistor set, wherein:
The control end of described the first bipolar transistor set is connected with the control end of described the 3rd bipolar transistor set, and the control end of this first bipolar transistor set is connected with the first end of described the 4th bipolar transistor set, the first end of described the first bipolar transistor set is connected with DC power supply, and the second end has the first input current I as the first input end input of this divider
1;
Described the first input current I
1the current signal corresponding with line voltage peak signal sampling signal;
The control end of described the second bipolar transistor set is connected with the second end of described the first bipolar transistor set, the first end of described the second bipolar transistor set connects described DC power supply, the second end of described the second bipolar transistor set connects the second end of described the 4th bipolar transistor set, the output current I that the electric current flowing through on this second bipolar transistor is this divider
out;
The first end of described the 3rd bipolar transistor set connects described DC power supply, and the second end connects the control end of described the 4th bipolar transistor set, and this second end has the second input current I as the second input input of this divider
2;
Described the second input current I
2the current signal corresponding to commutating voltage sampled signal of Switching Power Supply;
The first end of described the 4th bipolar transistor set has the 3rd input current I as the 3rd input input of this divider
3;
Described the 3rd input current I
3constant-current source Ic.
Preferably, above-mentioned Switching Power Supply is with also comprising in divider, be connected to the switching tube between described DC power supply and the first end of described the second bipolar transistor set, and the first end of this switching tube is connected with described DC power supply, the second end of this switching tube is connected with the first end of described the second bipolar transistor set, and control end is connected with the second end of this switching tube.
Preferably, described switching tube is PMOS pipe, and the first end of described switching tube, the second end, control end are respectively source electrode, drain electrode, the grid of PMOS pipe.
Preferably, described the first bipolar transistor set is the first bipolar transistor, and the control end of described the first bipolar transistor set, first end, the second end are respectively base stage, collector electrode, the emitter of described the first bipolar transistor;
Described the second bipolar transistor set is base stage, collector electrode, the emitter that control end, first end, second end of the second bipolar transistor set is respectively described the second bipolar transistor described in the second bipolar transistor;
Described the 3rd bipolar transistor set is base stage, collector electrode, the emitter that control end, first end, second end of the 3rd bipolar transistor set is respectively described the 3rd bipolar transistor described in the 3rd bipolar transistor;
Described the 4th bipolar transistor set is base stage, collector electrode, the emitter that control end, first end, second end of the 4th bipolar transistor set is respectively described the 4th bipolar transistor described in the 4th bipolar transistor.
Preferably, described first, second, third bipolar transistor is NPN transistor.
Preferably, described the first bipolar transistor set comprises the 5th bipolar transistor and the 6th bipolar transistor of cascade, the base stage of described the 5th bipolar transistor is the control end of this first bipolar transistor set, the collector electrode of the 5th bipolar transistor is connected with the collector electrode of described the 6th bipolar transistor as the first end of this first bipolar transistor set, the emitter of the 5th bipolar transistor is connected with the base stage of described the 6th bipolar transistor, the emitter of described the 6th bipolar transistor is as the second end of this first bipolar transistor set,
Described the second bipolar transistor set comprises the 7th bipolar transistor and the 8th bipolar transistor of cascade, the base stage of described the 7th bipolar transistor is the control end of this second bipolar transistor set, the collector electrode of described the 7th bipolar transistor is as the first end of described the second bipolar transistor set, and the emitter of described the 7th bipolar transistor is connected with the base stage of described the 8th bipolar transistor; The collector electrode of described the 8th bipolar transistor is connected with the collector electrode of described the 7th bipolar transistor, the second end of very described the second bipolar transistor set of the transmitting of the collector electrode of the 8th bipolar transistor;
Described the 3rd bipolar transistor set comprises the 9th bipolar transistor and the tenth bipolar transistor of cascade, the base stage of described the 9th bipolar transistor is the control end of the 3rd bipolar transistor set, the emitter of described the 9th bipolar transistor is connected with the base stage of described the tenth bipolar transistor, and the collector electrode of described the 9th bipolar transistor is connected as the first end of the 3rd bipolar transistor set with the collector electrode of described the tenth bipolar transistor; The second end of very described the 3rd bipolar transistor set of the transmitting of described the tenth bipolar transistor;
Described the 4th bipolar transistor set comprises the 11 bipolar transistor and the 12 bipolar transistor of cascade, the base stage of described the 11 bipolar transistor is the control end of the 4th bipolar transistor set, the current collection of the 11 bipolar transistor is the first end of the 4th bipolar transistor set very, emitter is connected with the base stage of described the 12 bipolar transistor, the collector electrode of described the 12 bipolar transistor is connected with the collector electrode of described the 11 bipolar transistor, the transmitting of described the 12 bipolar transistor is the second end of the 4th bipolar transistor set very.
Preferably, described the 5th, the the the 6th, the 7th, the 8th, the 9th, the tenth, the 11, the 12 bipolar transistor is NPN transistor.
The present invention also provides a kind of Switching Power Supply controller, comprise constant-current drive circuit, for generation of follow described Switching Power Supply input voltage variation tendency change predeterminated voltage, this predeterminated voltage offers the power switch pipe control circuit for generation of power ratio control switch tube working status in described controller, so that switch power supply output current is constant, described constant-current drive circuit comprises above-mentioned Switching Power Supply divider.
The present invention also provides a kind of Switching Power Supply, comprise the controller with constant-current drive circuit, this constant-current drive circuit for generation of follow described Switching Power Supply input voltage variation tendency change predeterminated voltage, this predeterminated voltage offers in described controller the power switch pipe control circuit for generation of the operating state of power ratio control switching tube, so that switch power supply output current maintenance is constant, described constant-current drive circuit comprises above-mentioned Switching Power Supply divider.
, between the output current of this divider and input current, there is following relation in the technical scheme being provided from above the embodiment of the present application:
wherein, suppose
i
1be the current signal corresponding with line voltage peak signal sampling signal, can obtain according to relation between bipolar transistor base current, collector current and emitter current three: I
out_min=(n*I
3/ β)
m,
wherein, I
out_minand I
out_maxβ in expression formula is the multiplication factor of bipolar transistor set, and m is positive integer, equates with the bipolar transistor cascade number in bipolar transistor set.
By I
out_minand I
out_maxexpression formula is known, when line voltage higher, I
1also just larger, but n is less, the I obtaining
out_minand I
out_maxalso just less, therefore the divider that the embodiment of the present application provides has the function of line compensation.Thereby, Switching Power Supply without and set up line voltage compensation circuit outward, simplify circuit structure, reduced cost.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, the accompanying drawing the following describes is only some embodiment that record in the application, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The electrical block diagram of a kind of divider that Fig. 1 provides for the embodiment of the present application;
Fig. 2 is the output current wave figure of the divider shown in Fig. 1;
The electrical block diagram of the another kind of divider that Fig. 3 provides for the embodiment of the present application;
The structural representation of a kind of Switching Power Supply that Fig. 4 provides for the embodiment of the present application;
The Switching Power Supply that Fig. 5 provides for the embodiment of the present application structural representation of controller;
The structural representation of the constant-current control circuit that Fig. 6 provides for the embodiment of the present application.
Embodiment
The embodiment of the present application provides a kind of Switching Power Supply divider, this divider comprises: the first bipolar transistor set, the second bipolar transistor set, the 3rd bipolar transistor set and the 4th bipolar transistor set, wherein, the control end of described the first bipolar transistor set is connected with the control end of described the 3rd bipolar transistor set, and the control end of this first bipolar transistor set is connected with the first end of described the 4th bipolar transistor set, the first end of described the first bipolar transistor set is connected with DC power supply, the electric current that the second end flows through is the first input current I
1, the control end of described the second bipolar transistor set is connected with the second end of described the first bipolar transistor set, the first end of described the second bipolar transistor set connects described DC power supply, the second end of described the second bipolar transistor set connects the second end of described the 4th bipolar transistor set, the output current I that the electric current flowing through on this second bipolar transistor is this divider
out, the first end of described the 3rd bipolar transistor set connects described DC power supply, and the second end connects the control end of described the 4th bipolar transistor set, and the electric current that this second end flows through is the second input current I
2, the electric current that the first end of described the 4th bipolar transistor set flows through is the 3rd input current I
3.
Between the output current of the divider that the embodiment of the present application provides and input current, there is following relation:
wherein hypothesis
and can obtain according to relation between bipolar transistor base current, collector current and emitter current three: I
out_min=(n*I
3/ β)
m,
Wherein, I
out_minand I
out_maxβ in expression formula is the multiplication factor of bipolar transistor set, and m is positive integer, equates with the bipolar transistor cascade number in bipolar transistor set.
By I
out_minand I
out_maxexpression formula is known, I
1current signal corresponding to line voltage peak sampled signal, when line voltage higher, I
1also just larger, but n is less, the I obtaining
out_minand I
out_maxalso just less, therefore the divider that the embodiment of the present application provides has the function of line compensation.
In order to make those skilled in the art person understand better the technical scheme in the application, below in conjunction with the accompanying drawing in the embodiment of the present application, technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only some embodiments of the present application, instead of whole embodiment.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtaining under creative work prerequisite, all should belong to the scope of the application's protection.
Refer to Fig. 1, show a kind of electrical block diagram of divider, first, second, third, fourth bipolar transistor set of this divider is respectively NPN transistor Q1, Q2, Q3, Q4, wherein:
The base stage of transistor Q1 is connected with the base stage of transistor Q3, and the collector electrode of transistor Q1 is connected with DC power supply VDD, the emitter of transistor Q1 and the first current source I
1be connected; The base stage of transistor Q2 is connected with the emitter of described transistor Q1, and the collector electrode of transistor Q2 is connected with DC power supply VDD by switching tube P1, and the emitter of transistor Q2 is connected with the emitter of transistor Q4; The collector electrode of transistor Q3 is connected with DC power supply VDD, emitter and the second current source I
2be connected, the base stage of transistor Q4 is connected with the emitter of transistor Q3, collector electrode and the 3rd current source I
3be connected, and the collector electrode of transistor Q4 is connected with the base stage of transistor Q3.
The electric current of first, second, third current source is the input current of this divider, the output current that the electric current that flows through switching tube P1 is this divider.
Transistorized annexation is as shown in Figure 1 known, and the voltage difference between each transistorized base stage and emitter exists following relation:
Vbe1+Vbe2=Vbe3+Vbe4 （1）
Wherein, Vbe1 in formula (1) is the voltage difference between base stage and the emitter of transistor Q1, Vbe2 is the voltage difference between base stage and the emitter of transistor Q2, the voltage difference between base stage and the emitter of Vbe3 transistor Q3, the voltage difference between base stage and the emitter of Vbe4 transistor Q4.
Due to, the voltage difference between transistorized base stage and emitter is as follows:
Vbe1=V
T*ln(I
1/Is) （2）
Vbe2=V
T*ln(I
out/Is) (3)
Vbe3=V
T*ln(I
2/Is) (4)
Vbe4=V
T*ln(I
3/Is) (5)
Wherein, V
tfor temperature voltage equivalent, V
t=KT/q, wherein K is Boltzmann constant, T is thermodynamic temperature, the electric weight that q is electronics, at 27 DEG C of normal temperature, V
t≈ 26mV, Is is reverse saturation current.
Therefore, can be obtained by formula (1):
V
t* ln (I
1/ Is)+V
t* ln (I
out/ Is)=V
t* ln (I
2/ Is)+V
t* ln (I
3/ Is), can obtain:
I
1*I
out=I
2*I
3 （6）
From formula (6), the output current of the divider shown in Fig. 2 is:
The multiplication factor of transistor Q1-Q4 is identical, and is β, therefore,
I
C_Q1=I
1+I
out/β-I
1/β=I
1+(I
out-I
1)/β （8）
I
C_Q3=I
2+I
3/β-I
2/β=I
2+(I
3-I
2)/β （9）
I
C_Q4=I
3-I
1/β-I
2/β=I
3-(I
2+I
1)/β （10）
Wherein, I in above-mentioned formula
c_Q1for the collector current of transistor Q1, I
c_Q3for the collector current of transistor Q3, it is the collector current of transistor Q4.
Due to the output current of divider
due to I
3=I
c_Q4, and transistorized base current very I ignore, therefore I
c_Q1≈ I
1, I
c_Q3≈ I
2, I
c_Q3≈ I
2, therefore,
Suppose,
Try to achieve the minimum value I of formula (12)
out_minwith maximum I
out_maxbe respectively:
I
out_min=n·I
3/β （14）
From formula (12), if I
1larger, n is less, also I
out_minand I
out_maxalso just less.Wherein, V
1the line voltage peak sampled signal of Switching Power Supply input, I
1v
1corresponding electric current, therefore, when line voltage higher, V
1also when can phase strain large, I
1also just larger, n is less, the I obtaining
out_minand I
out_maxalso just less, therefore the divider that the embodiment of the present application provides has the function of line compensation.
Refer to Fig. 2, show the output current wave figure of the divider that Fig. 2 provides, the abscissa of this figure is the second input current I
2with the ratio of the first input current, the output current I that ordinate is this divider
out; Wherein, this oscillogram is at I
3under the condition of=30uA, record, and dotted line is I
1the oscillogram of the output current that=10uA is corresponding; Solid line is I
1the oscillogram of the output current that=30uA is corresponding.As shown in Figure 3, I
1larger, the electric current of this divider output is less, plays line voltage compensation effect, thereby the output current of Switching Power Supply is consistent.
Preferably, switching tube P1 in the present embodiment can be PMOS pipe, and the drain electrode of P1 is connected with the collector electrode of transistor Q2, source electrode is connected with DC power supply VDD, grid is connected with drain electrode, and this PMOS pipe is for the output current of this divider being offered to the circuit module of rear class, concrete, this switching tube P1 and extra another switching tube increasing need to be formed to mirror image circuit, the electric current on described another switching tube is the electric current I on switching tube P1
outimage current, and this image current is offered to the late-class circuit module being connected with this another switching circuit.
The divider that the present embodiment provides not only has the basic function of divider, also has line voltage compensation function, makes Switching Power Supply without the extra line voltage compensation circuit that increases, thereby simplify circuit structure, save cost, and, known according to formula (14) and (15), the output current of divider is relevant with n, line voltage is larger, and n is less, and the corresponding relation between line voltage and n is stablized constant, therefore, the line voltage compensation function-stable of this divider.
Between the input and output of the divider that above-described embodiment provides, present once relation, refer to Fig. 4, show the electrical block diagram of another kind of divider, between the output of this divider and input, present quadratic relation.
As shown in Figure 3, this divider comprises: transistor Q5, Q6, Q7, Q8, Q9, Q10, Q11, Q12, wherein:
Q5 and Q6 cascade form the first bipolar transistor set of divider, the emitter of Q5 is connected with the base stage of Q6, the collector electrode of Q5 is connected with the collector electrode of Q6, and be connected with DC power supply VDD as the first end of the first bipolar transistor set, the transmitting of Q6 is the second end of the first bipolar transistor set very, and the electric current that flows through Q6 emitter is the first input current I
1, this first input current I
1for current signal corresponding to Switching Power Supply line voltage peak sampled signal, the base stage of Q5 is the control of the first bipolar transistor set.
Q7 and Q8 cascade form the second bipolar transistor set of divider, the base stage of Q7 is connected as second control end of bipolar transistor set and the emitter of Q6, the collector electrode of Q7 is connected with DC power supply VDD by switching tube P1 as the first end of the second bipolar transistor set, the emitter of Q7 is connected with the base stage of Q8, the collector electrode of Q8 is connected with the collector electrode of Q7, and the transmitting of Q8 is the second end of the second bipolar transistor set very.
Q9 and Q10 cascade form the 3rd bipolar transistor set of divider, the base stage of Q9 is connected as the 3rd control end of bipolar transistor set and the base stage of described Q5, the collector electrode of Q10 is connected with Q9 collector electrode and is connected with DC power supply VDD, and the emitter input of Q10 has the second input current I
2, current signal corresponding to commutating voltage sampled signal that this second input current is Switching Power Supply.
Q11 and Q12 cascade form the 4th bipolar transistor set of divider, and the base stage of Q11 is connected as the 4th control end of bipolar transistor set and the emitter of Q10, and the collector electrode input of Q11 has the 3rd input current I
3, the emitter of Q11 is connected with the base stage of Q12, and the collector electrode of Q12 is connected with the collector electrode of Q11, and the emitter of Q12 is connected with the emitter of Q8 as the second end of described the 4th bipolar transistor set.
Can be obtained by each transistorized annexation in Fig. 3:
Vbe5+Vbe6+Vbe7+Vbe8=Vbe9+Vbe10+Vbe11+Vbe12 （16）
According to transistorized characteristic, the output current of the present embodiment divider is:
Suppose,
,
The minimum value I of formula (19)
out_min1with maximum I
out_max1be respectively:
I
out_min1=(n·I
3/β)
2 （20）
If I
1larger, n
2less, I
out_min1and I
out_max1also just less, due to I
1for the current signal corresponding to line voltage peak sampled signal of Switching Power Supply input, therefore, in the time that line voltage is higher, I
1also just larger, the I obtaining
out_min1and I
out_max1also just less, therefore the divider that the embodiment of the present application provides has the function of certain line compensation.
Preferably, as shown in Figure 3, described divider also comprises switching tube P1, concrete, this switching tube P1 can manage realization by PMOS, the drain electrode of PMOS pipe is connected with the base stage of Q5, and source electrode is connected with DC power supply VDD, and grid is connected with drain electrode, this PMOS pipe is for offering the output current of this divider the circuit module of rear class, concrete, this switching tube P1 and extra another switching tube increasing need to be formed to mirror image circuit, the electric current on described another switching tube is the electric current I on switching tube P1
outimage current, and this image current is offered to the late-class circuit module being connected with this another switching circuit.…..
The divider that the present embodiment provides makes output current and input current present the relation of quadratic power, and the embodiment of the divider corresponding with Fig. 2 compares, and works as I
1increase amplitude is identical, n
2reduce with quadratic relation, i.e. n
2be less than n, i.e. I
out_min1and I
out_max1be less than respectively I
out_minand I
out_maxtherefore the output current of the divider that the present embodiment provides is less, therefore, the line voltage compensation performance of the divider that the present embodiment provides is higher than the line voltage compensation function of divider corresponding to Fig. 2.
It should be noted that, it is only preferred embodiment that the output that this specification provides and input present once with the embodiment of the divider of quadratic relation, certainly by changing the progression of cascade, can obtain the repeatedly relation of side, and the present invention does not limit this.
The embodiment of the present invention also provides a kind of Switching Power Supply, refers to Fig. 4, shows the structural representation of Switching Power Supply, and this Switching Power Supply comprises: rectification circuit 100, transformer 200, controller 300, power switch pipe 400, wherein:
Rectification circuit 100 carries out alternating current input power supplying Vac to offer transformer 200 after rectification.
Transformer 200 comprises former limit winding 201, the secondary winding 202 being coupled with described former limit winding 201, and the auxiliary winding 203 being coupled with described secondary winding 202, auxiliary winding 203 is used to described controller 300 that power supply is provided, and the conduct after rectifying and wave-filtering of the output current of secondary winding 202 drives the drive current of load.
Controller 300, for the operating state of the detection information power ratio control switching tube 400 of each test side, is constant current thereby make the mean value of switch power supply output current.
The structural representation of controller shown in Figure 5, this controller comprises: secondary winding state signal generating circuit 301, power switch pipe switch off control circuit 302, constant-current control circuit 303 and drive circuit 304, wherein:
Described secondary winding state signal generating circuit 301, for generation of the logic level signal corresponding with secondary winding 202 states, concrete, in the time of the conducting of secondary winding, this secondary winding state signal generating circuit 301 produces logic-high signal; In the time that secondary winding ends, this secondary winding state signal generating circuit 301 produces logic low.
Described power switch pipe switches off control circuit 302, and in the time that the voltage signal that the described primary current of reflection detected reaches described predeterminated voltage, power output switching tube turn-offs control signal.
Described constant-current control circuit 303, the predeterminated voltage Vcs_ref changing for generation of following the variation tendency of described input voltage vin, offers described power switch pipe and switches off control circuit 302, and, for generation of power switch pipe conducting control signal, offer described drive circuit 304;
Drive circuit 304, for turn-offing after control signal when receiving described power switch pipe, controls described power switch pipe and turn-offs, and when receiving after described power switch pipe conducting control signal, control described power switch pipe conducting.
Refer to Fig. 6, show the structural representation of the constant-current control circuit that the embodiment of the present application provides, this main circuit will comprise:
Input voltage peak value sampling circuit 310, the first voltage-current converter circuits 320, second voltage current converter circuit 330, divider 340, predeterminated voltage produce circuit 350, and the power pipe Continuity signal that opens the light produces circuit 360, wherein:
Described input voltage peak value sampling circuit 310, for obtaining reflecting the real peak signal of former limit winding input voltage.
Described the first voltage-current converter circuit 320, for being converted to corresponding current sampling signal by described input voltage sampled signal;
Described second voltage current converter circuit 330, for changing corresponding current signal by described crest voltage sampled signal;
The first input end of described divider 340 is connected with the output of described second voltage current converter circuit 330, the second input is connected with the output of described the first voltage-current converter circuit 320, the 3rd input is connected with constant-current source Ic, output produces circuit 350 with described predeterminated voltage and is connected, meanwhile, the output of divider is connected with described power switch pipe Continuity signal generation circuit 360.
Described divider 340 is consistent with the phase preserving of described input voltage vin for generation of phase place, and the current signal of amplitude between 0～Ic has line voltage compensation function simultaneously.
Described predeterminated voltage produces circuit 350, and the electric current I divider exporting according to divider 340 produces predeterminated voltage Vcs_ref, and the phase place of this predeterminated voltage Vcs_ref is identical with the phase place of input voltage vin.
Described power switch pipe Continuity signal produces circuit 360, the electric current I divider exporting according to divider 340 produces power switch pipe conducting control signal, for the when conducting of power ratio control switching tube, thereby the ratio that makes the ON time of secondary winding and the switch periods of power switch pipe is a particular expression formula, ensure that the average current of LED drive circuit output is steady state value.
Divider in the Switching Power Supply that the present embodiment provides in constant-current control circuit not only has the basic function of divider, also there is line voltage compensation function, therefore make Switching Power Supply increase line voltage compensation circuit without extra, thereby simplified circuit structure, saved cost.
It should be noted that, in this article, relational terms such as the first and second grades is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply and between these entities or operation, have the relation of any this reality or sequentially.
The above is only the application's embodiment; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the application's principle; can also make some improvements and modifications, these improvements and modifications also should be considered as the application's protection range.
Claims (9)
1. a Switching Power Supply divider, is characterized in that, comprising: the first bipolar transistor set, the second bipolar transistor set, the 3rd bipolar transistor set and the 4th bipolar transistor set, wherein:
The control end of described the first bipolar transistor set is connected with the control end of described the 3rd bipolar transistor set, and the control end of this first bipolar transistor set is connected with the first end of described the 4th bipolar transistor set, the first end of described the first bipolar transistor set is connected with DC power supply, and the second end has the first input current I as the first input end input of this divider
1;
Described the first input current I
1the current signal corresponding with line voltage peak signal sampling signal;
The control end of described the second bipolar transistor set is connected with the second end of described the first bipolar transistor set, the first end of described the second bipolar transistor set connects described DC power supply, the second end of described the second bipolar transistor set connects the second end of described the 4th bipolar transistor set, the output current I that the electric current flowing through on this second bipolar transistor is this divider
out;
The first end of described the 3rd bipolar transistor set connects described DC power supply, and the second end connects the control end of described the 4th bipolar transistor set, and this second end has the second input current I as the second input input of this divider
2;
Described the second input current I
2the current signal corresponding to commutating voltage sampled signal of Switching Power Supply;
The first end of described the 4th bipolar transistor set has the 3rd input current I as the 3rd input input of this divider
3;
Described the 3rd input current I
3constant-current source Ic.
2. Switching Power Supply divider according to claim 1, it is characterized in that, also comprise, be connected to the switching tube between described DC power supply and the first end of described the second bipolar transistor set, and the first end of this switching tube is connected with described DC power supply, the second end of this switching tube is connected with the first end of described the second bipolar transistor set, and control end is connected with the second end of this switching tube.
3. Switching Power Supply divider according to claim 2, is characterized in that, described switching tube is PMOS pipe, and the first end of described switching tube, the second end, control end are respectively source electrode, drain electrode, the grid of PMOS pipe.
4. according to the Switching Power Supply divider described in claim 1-3 any one, it is characterized in that,
Described the first bipolar transistor set is the first bipolar transistor, and the control end of described the first bipolar transistor set, first end, the second end are respectively base stage, collector electrode, the emitter of described the first bipolar transistor;
Described the second bipolar transistor set is the second bipolar transistor, and the control end of described the second bipolar transistor set, first end, the second end are respectively base stage, collector electrode, the emitter of described the second bipolar transistor;
Described the 3rd bipolar transistor set is the 3rd bipolar transistor, and the control end of described the 3rd bipolar transistor set, first end, the second end are respectively base stage, collector electrode, the emitter of described the 3rd bipolar transistor;
Described the 4th bipolar transistor set is the 4th bipolar transistor, and the control end of described the 4th bipolar transistor set, first end, the second end are respectively base stage, collector electrode, the emitter of described the 4th bipolar transistor.
5. Switching Power Supply divider according to claim 4, is characterized in that, described first, second, third bipolar transistor is NPN transistor.
6. according to the Switching Power Supply divider described in claim 1-3 any one, it is characterized in that:
Described the first bipolar transistor set comprises the 5th bipolar transistor and the 6th bipolar transistor of cascade, the base stage of described the 5th bipolar transistor is the control end of this first bipolar transistor set, the collector electrode of the 5th bipolar transistor is connected with the collector electrode of described the 6th bipolar transistor as the first end of this first bipolar transistor set, the emitter of the 5th bipolar transistor is connected with the base stage of described the 6th bipolar transistor, and the emitter of described the 6th bipolar transistor is as the second end of this first bipolar transistor set;
Described the second bipolar transistor set comprises the 7th bipolar transistor and the 8th bipolar transistor of cascade, the base stage of described the 7th bipolar transistor is the control end of this second bipolar transistor set, the collector electrode of described the 7th bipolar transistor is as the first end of described the second bipolar transistor set, and the emitter of described the 7th bipolar transistor is connected with the base stage of described the 8th bipolar transistor; The collector electrode of described the 8th bipolar transistor is connected with the collector electrode of described the 7th bipolar transistor, the second end of very described the second bipolar transistor set of the transmitting of the 8th bipolar transistor;
Described the 3rd bipolar transistor set comprises the 9th bipolar transistor and the tenth bipolar transistor of cascade, the base stage of described the 9th bipolar transistor is the control end of the 3rd bipolar transistor set, the emitter of described the 9th bipolar transistor is connected with the base stage of described the tenth bipolar transistor, and the collector electrode of described the 9th bipolar transistor is connected as the first end of the 3rd bipolar transistor set with the collector electrode of described the tenth bipolar transistor; The second end of very described the 3rd bipolar transistor set of the transmitting of described the tenth bipolar transistor;
Described the 4th bipolar transistor set comprises the 11 bipolar transistor and the 12 bipolar transistor of cascade, the base stage of described the 11 bipolar transistor is the control end of the 4th bipolar transistor set, the current collection of the 11 bipolar transistor is the first end of the 4th bipolar transistor set very, emitter is connected with the base stage of described the 12 bipolar transistor, the collector electrode of described the 12 bipolar transistor is connected with the collector electrode of described the 11 bipolar transistor, the transmitting of described the 12 bipolar transistor is the second end of the 4th bipolar transistor set very.
7. Switching Power Supply divider according to claim 6, is characterized in that, described the 5th, the the the 6th, the 7th, the 8th, the 9th, the tenth, the 11, the 12 bipolar transistor is NPN transistor.
8. a Switching Power Supply controller, comprise constant-current drive circuit, for generation of follow described Switching Power Supply input voltage variation tendency change predeterminated voltage, this predeterminated voltage offers the power switch pipe control circuit for generation of power ratio control switch tube working status in described controller, so that switch power supply output current is constant, it is characterized in that, described constant-current drive circuit comprises the Switching Power Supply divider described in claim 1-7 any one.
9. a Switching Power Supply, comprise the controller with constant-current drive circuit, this constant-current drive circuit for generation of follow described Switching Power Supply input voltage variation tendency change predeterminated voltage, this predeterminated voltage offers in described controller the power switch pipe control circuit for generation of the operating state of power ratio control switching tube, so that switch power supply output current maintenance is constant, it is characterized in that, described constant-current drive circuit comprises the Switching Power Supply divider described in claim 1-7 any one.
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| CN201110383939.7A CN102437735B (en) | 2011-11-25 | 2011-11-25 | Switch power supply and divider therefor |
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| CN201110383939.7A CN102437735B (en) | 2011-11-25 | 2011-11-25 | Switch power supply and divider therefor |
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| CN102437735B true CN102437735B (en) | 2014-09-10 |
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| CN113778159B (en) * | 2021-09-26 | 2022-05-13 | 电子科技大学 | Low-power-consumption current divider |
| CN114337337A (en) * | 2021-12-23 | 2022-04-12 | 昂宝电子（上海）有限公司 | Switching power supply and control chip and control method thereof |
| CN115016580B (en) * | 2022-05-16 | 2023-02-28 | 电子科技大学 | Current divider with wide input range |
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