CN201477463U - Circuit in switch power supply for controlling constant-current output - Google Patents
Circuit in switch power supply for controlling constant-current output Download PDFInfo
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- CN201477463U CN201477463U CN2009201532433U CN200920153243U CN201477463U CN 201477463 U CN201477463 U CN 201477463U CN 2009201532433 U CN2009201532433 U CN 2009201532433U CN 200920153243 U CN200920153243 U CN 200920153243U CN 201477463 U CN201477463 U CN 201477463U
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- line voltage
- resistance
- shutoff
- voltage
- compensation module
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Abstract
The utility model provides a circuit in a switch power supply for controlling constant-current output. The circuit comprises a line voltage compensation module which is used for detecting the line voltage according to a feedback signal generated when an original side power switching tube is conducted; furthermore, the line voltage compensation module processes the line voltage and prearranged shutdown reference voltage according to a prearrangement rule so as to output shutdown threshold voltage which changes with the change of the line voltage, wherein the first output terminal of the line voltage compensation module is connected with the negative input terminal of a shutdown comparator; and the feedback signal and the prearranged shutdown reference voltage are connected with two input terminals of the line voltage compensation module. Therefore, in the embodiment of the utility model, off-chip resistors are not used; furthermore, compared with the prior art, the peripheral circuit design and composition are simplified, the cost of the whole system is reduced, the volume of the system is reduced, simultaneously the current consumed by the off-chip resistor is reduced, and the efficiency of the system is improved.
Description
Technical field
The utility model relates to the semiconductor circuit technical field, controls constant current output circuit in particularly a kind of Switching Power Supply.
Background technology
Referring to Fig. 1, this figure is former limit gating pulse frequency modulation (PFM) (PFM, Pulse Frequency Modulation) the mode switch power principle figure that does not have line voltage compensation in the prior art.
As shown in Figure 1, when former limit power switch pipe 102 turn-offs, the voltage follow secondary voltage V on the ancillary coil 106
OutChange electric resistance partial pressure value V
FbBehind voltage error controller 120 (VEC, VoltageError Controller), produce asserts signal, the output terminal Q of trigger 121 opens 102 by driving circuit DRV 122.V
RefFor turn-offing the threshold voltage of comparer 118, detect the voltage V at resistance 103 two ends when primary current
CSRise to V
RefThe time, producing cut-off signals, this cut-off signals is through a lead-edge-blanking (LEB, Leading Edge Blanking) after module 119 time-delays, generates a reset signal to 121, turn-off 102 by 122 again, this moment, power transfer was to secondary coil 105, until the next cycle switch conduction.
When the switch conduction of former limit,
By this formula as can be seen, when not collinear voltage is imported, the slope difference that primary current rises, the high more then slope of line voltage is big more.Turn-off 102 from 118 output cut-off signals to reality a circuit delay time T is arranged
d, at T
dInterior primary current continues to raise.T
dSize determine that by circuit structure the variation with line voltage does not change.When line voltage not simultaneously, through identical T
dAfter, 102 o'clock former limit peak point current I of actual shutoff
PKWill be different.System's output current is
I wherein
PKSBe secondary coil peak point current, T
OnsBe secondary coil current duration, T
OffsFor in the one-period except T
OnsPart, N
PBe the primary coil number of turn, N
SBe the secondary coil number of turn, remove I
PKOutward, all the other parameters all are system's fixed values.When therefore not collinear voltage is imported, I
PKDifference, I
OutAlso just different.When line voltage was high, output current was big; When line voltage hanged down, output current was little, the requirement of this circuit output steady current in the time of can not reaching the input of not collinear voltage.Driving circuit for the Bipolar power switch pipe, before requiring power switch pipe to close, need to cut off base current, therefore need to add a pre-cut-off signals, turn-off earlier the base drive electric current, allow the electric charge that base-emitter gathers in the switching tube provide switching tube required electric current, arrive up to cut-off signals, the electric charge that base-emitter gathers has been put, and switching tube moment is finished shutoff.When isochrone voltage was high, the electric charge that base-emitter gathers was many, therefore needed the more pre-turn-off time to discharge.
Fig. 2 is V when adopting the NPN switching tube and not having line voltage compensation
CSWaveform with pre-shutoff comparer 117 and the threshold voltage that turn-offs comparer 118.Figure intermediate cam ripple is V
CSWaveform, solid line V
Ref_preAnd V
RefBe respectively fixing pre-shutoff threshold voltage and turn-off threshold voltage, dotted line V
Sd_preAnd V
SdBe respectively through T
dShi Ji pre-shutoff voltage and shutoff voltage afterwards.Can from figure, see line voltage not simultaneously, V
Sd_preAnd V
SdAlso different.V
CSAlong with line voltage difference is also different, when line voltage was high, Δ t was little from the time Δ t of pre-shutoff.But because line voltage when high, needs the more pre-turn-off time to discharge.Therefore when if cut-off signals arrives also discharge finish, the NPN switching tube can continue conducting, finish just really to turn-off up to discharge, thereby V during the input of high line voltage
PKV when importing greater than low line voltage
PK, and V
PKDiversity ratio T
dThe difference of the Δ V that time produces is big.I when being the input of high line voltage
PKI when importing greater than low line voltage
PK, output current difference when therefore not collinear voltage is imported, line voltage is high more, and output current is big more.
Fig. 3 is V when adopting the nmos switch pipe and not having line voltage compensation
CSWaveform with the threshold voltage that turn-offs comparer 118.Figure intermediate cam ripple is V
CSWaveform, solid line V
RefBe fixing shutoff threshold voltage, dotted line V
SdBe process T
dShi Ji shutoff voltage afterwards.Can see line voltage not simultaneously, V
SdThe V during input of also difference, and high line voltage
PKV when importing greater than low line voltage
PK, I when promptly high line voltage is imported
PKI when importing greater than low line voltage
PK, output current difference when therefore not collinear voltage is imported, line voltage is high more, and output current is big more.
For these reasons, have in the prior art a kind ofly to compensate the circuit of primary coil peak point current, in the time of can making different line voltages input, through circuit delay time T by the outer line voltage compensation resistor network of a sheet
dThe actual former limit peak point current in back is identical, thereby system's output current is identical when making different line voltage inputs.
Fig. 4 is the former limit control PFM mode switch power principle figure of the outer line voltage compensation resistor network of existing strap, and compared to Figure 1, this circuit has increased a line voltage compensation resistor network that sheet is outer, is made up of off chip resistor 203,213,214,215,216.V
CSBe formed by stacking by two parts, a part is line voltage V
InBe assigned to voltage V on the CS PIN by off chip resistor 215,216,214,213
CS_line, to be original edge voltage be assigned to voltage V on the CS PIN by off chip resistor 203,213,214,215 to another part
CS_RcsWhen line voltage is high, V
CS_lineBecome big, fix because chip internal turn-offs the threshold voltage of comparer, so V
CS_RcsDiminish, promptly 203 shutoff voltage diminishes.Because line voltage is imported when high, V
CSThe slope that rises is big, passes through T like this
dAfter, the voltage Δ V of increase is also just big.The value of trimmer external resistance and V
Ref_pre, V when not collinear voltage is imported
CS_RcsEquate with Δ V sum, the length of the pre-turn-off time Δ t when making high line voltage simultaneously during than low line voltage, the electric charge that base-emitter gathers when allowing actual cut-off signals arrive has all just been put, and passes through T like this
dThe former limit peak point current I of reality after time
PKJust equate, thus the output current I of system
OutIdentical, promptly realized the requirement of output steady current when not collinear voltage is imported.
V when Fig. 5 is outer line voltage compensation resistor network of existing strap and employing NPN switching tube
CS_RcsWaveform with pre-shutoff comparer 217 and the equivalent threshold voltage that turn-offs comparer 218.Figure intermediate cam ripple is V
CS_RcsWaveform, solid line V
Ref_pre-V
CS_lineAnd V
Ref-V
CS_lineBe respectively that 217 and 218 equivalence is pre-turn-offs threshold voltage and threshold voltage, dotted line V are turn-offed in equivalence
Sd_pre-V
CS_lineAnd V
Sd-V
CS_lineBe respectively through T
dActual afterwards pre-shutoff voltage of equivalence and equivalent shutoff voltage.Can be high as seen from the figure the pre-turn-off time Δ t during line voltage length during than low line voltage, and the crest voltage V of former frontier inspection measuring resistance 203 during the input of not collinear voltage
PKIdentical, promptly former limit peak point current I
PKIdentical, realized the requirement of output steady current when not collinear voltage is imported.
Because prior art is to compensate former limit peak point current by the outer line voltage compensation resistor network of a sheet, when not collinear voltage is imported, actual former limit peak point current is identical, so this outer line voltage compensation network will make the entire circuit system bulk become big, cost increases in the specific implementation, and the reliability of entire circuit system is reduced; Further, off-chip compensation resistance consumption one part of current reduces the efficient of system.
The utility model content
The technical problems to be solved in the utility model provides in a kind of Switching Power Supply and controls constant current output circuit, can reduce the volume of Circuits System, promotes the reliability of Circuits System.
The utility model provides in a kind of Switching Power Supply and controls constant current output circuit, comprising:
The line voltage compensation module, feedback signal detection line voltage when described line voltage compensation module is used for according to the power switch pipe conducting of former limit, and described line voltage and the shutoff reference voltage that presets handled the shutoff threshold voltage that changes with the variation of described line voltage with output according to presetting rule;
Wherein, first output terminal of described line voltage compensation module links to each other with the negative input end that turn-offs comparer, and described feedback signal and the shutoff reference voltage that presets are connected to two input ends of described line voltage compensation module.
Optionally, the positive input terminal of described shutoff comparer and V
CSLink to each other, the output terminal of described shutoff comparer links to each other with a R-S trigger.
Optionally, described line voltage compensation module comprises: first in-phase adder and first switch;
Described first in-phase adder is used for detected line voltage is suitably changed afterwards and the shutoff reference voltage that presets is weighted addition, to obtain described shutoff threshold voltage;
The output terminal of described first in-phase adder links to each other with the negative input end that turn-offs comparer by described first switch; Described first switch, being used at PFM is the described first in-phase adder continuous firing of Time Triggered of high level.
Optionally, described first in-phase adder comprises: first operational amplifier, first resistance, second resistance, the 3rd resistance and the 4th resistance;
Described first resistance is connected between the positive input terminal of feedback signal and described first operational amplifier;
Described second resistance is connected between the positive input terminal of the shutoff reference voltage signal that presets and described first operational amplifier;
Described the 3rd resistance is connected between the negative input end of ground wire and described first operational amplifier;
Described the 4th resistance is connected between the negative input end and output terminal of described first operational amplifier.
Optionally, described circuit also comprises: the 5th resistance, and an end of described the 5th resistance connects feedback signal, and the other end connects the second switch of described line voltage compensation module;
Then described line voltage compensation module also comprises second switch, and described second switch is used to control described the 5th resistance to produce described feedback signal;
One end of described second switch connects the 5th resistance of described line voltage compensation module, other end ground connection.
Optionally, described former limit power switch pipe is a metal-oxide-semiconductor.
Optionally, described former limit power switch pipe is a bipolar transistor, and then described line voltage compensation circuit also comprises:
Second in-phase adder and the 3rd switch;
The described second addition musical instruments used in a Buddhist or Taoist mass is used for detected line voltage is suitably changed afterwards and the pre-shutoff reference voltage that presets is weighted addition, to obtain pre-shutoff threshold voltage;
Described the 3rd switch, being used at PFM is the described second in-phase adder continuous firing of Time Triggered of high level;
The output terminal of described second in-phase adder links to each other with the negative input end of pre-shutoff comparer by described the 3rd switch.
Optionally, described second in-phase adder comprises: second operational amplifier, the 6th resistance, the 7th resistance, the 8th resistance and the 9th resistance;
Described the 6th resistance is connected between the positive input terminal of feedback signal and described second operational amplifier;
Between the pre-shutoff reference voltage signal that described the 7th resistance presets and the positive input terminal of described second operational amplifier;
Described the 8th resistance is connected between the negative input end of ground wire and described second operational amplifier;
Described the 9th resistance is connected between the negative input end and output terminal of described second operational amplifier.
Optionally, the output terminal of described pre-shutoff comparer links to each other with driving circuit, described V
CSBe connected to the positive input terminal of described pre-shutoff comparer.Compared with prior art, the utlity model has following advantage:
Control constant current output circuit in the Switching Power Supply that the utility model provides, by adopting the line voltage compensation module, feedback signal detection line voltage when described line voltage compensation module is used for according to the power switch pipe conducting of former limit, and described line voltage and the shutoff reference voltage that presets handled the shutoff threshold voltage that changes with the variation of described line voltage with output according to presetting rule; Wherein, first output terminal of described line voltage compensation module links to each other with the negative input end that turn-offs comparer, and described feedback signal and the shutoff reference voltage that presets are connected to two input ends of described line voltage compensation module.As can be seen, the utility model does not use off chip resistor, compared with prior art, has simplified peripheral circuit design and composition, has reduced the total system cost, has reduced system bulk, has reduced the electric current of off chip resistor loss simultaneously yet, has promoted system effectiveness.
Description of drawings
By the more specifically explanation of the preferred embodiment of the present utility model shown in the accompanying drawing, above-mentioned and other purpose, feature and advantage of the present utility model will be more clear.Reference numeral identical in whole accompanying drawings is indicated identical part.Painstakingly do not draw accompanying drawing, focus on illustrating purport of the present utility model by physical size equal proportion convergent-divergent.
Fig. 1 is the former limit control PFM Switching Power Supply schematic diagram that does not have line voltage compensation in the prior art;
Fig. 2 is Vcs and shutoff when adopting the NPN switching tube and not having line voltage compensation, turn-offs the oscillogram of comparator threshold voltage in advance;
Fig. 3 be when adopting the nmos switch pipe and not having line voltage compensation Vcs with turn-off the comparator threshold voltage oscillogram;
Fig. 4 is the former limit control PFM mode switch power principle figure of the outer line voltage compensation resistor network of strap in the prior art;
Fig. 5 is V during for the outer line voltage compensation resistor network of strap in the prior art
CS_RcsOscillogram with the equivalent threshold voltage that turn-offs comparer;
Fig. 6 is the utility model first embodiment circuit diagram;
Fig. 7 is a kind of specific implementation circuit diagram of the utility model first embodiment neutral voltage compensating module;
Fig. 8 is the another kind of specific implementation circuit diagram of the utility model first embodiment neutral voltage compensating module;
Fig. 9 is V during the integrated line voltage compensation of monolithic among the utility model first embodiment
CSWaveform with the threshold voltage that turn-offs comparer;
Figure 10 is the utility model second embodiment circuit diagram;
Figure 11 is the specific implementation circuit diagram of the utility model second embodiment neutral voltage compensating module;
Figure 12 is V during the integrated line voltage compensation of monolithic among the utility model second embodiment
CSWaveform with the threshold voltage that turn-offs comparer.
Embodiment
For above-mentioned purpose of the present utility model, feature and advantage can be become apparent more, embodiment of the present utility model is described in detail below in conjunction with accompanying drawing.
Control constant current output circuit in the Switching Power Supply that the utility model provides, comprise: the line voltage compensation module, feedback signal detection line voltage when described line voltage compensation module is used for according to the power switch pipe conducting of former limit, and described line voltage and the shutoff reference voltage that presets handled the shutoff threshold voltage that changes with the variation of described line voltage with output according to presetting rule; Wherein, first output terminal of described line voltage compensation module links to each other with the negative input end that turn-offs comparer, and described feedback signal and the shutoff reference voltage that presets are connected to two input ends of described line voltage compensation module.
The utility model also specifically provides the circuit of control constant current output in several Switching Power Supplies, describes in detail below in conjunction with accompanying drawing.
First embodiment:
Referring to Fig. 6, this figure is the utility model first embodiment circuit diagram.
In the present embodiment, described former limit power switch pipe 302 is specially metal-oxide-semiconductor, in accompanying drawing of the present utility model, for simplicity, power switch pipe 302 places, former limit all are plotted as NPN transistor, but those skilled in the art can know that this is an example in the reality, do not represent power switch pipe 302 certain NPN transistor that adopt in described former limit to realize.Two input ends of described line voltage compensation module 323 connect feedback signal (FB) and a shutoff reference voltage V who presets respectively
Ref0, the line voltage compensation module suitably changes the detected line voltage of described feedback signal afterwards and V
Ref0Addition obtains the voltage V with the line change in voltage
Ref, with V
RefAs the threshold voltage that turn-offs comparer 318, the positive input terminal of described shutoff comparer 318 and V
CSLink to each other, the output terminal of described shutoff comparer 318 links to each other with a R-S trigger, and described shutoff comparer 318 is with threshold voltage and V
CSRelatively can obtain cut-off signals, produce the reset signal of R-S trigger 321 by cut-off signals, start working to trigger driving circuit 322, promptly be to turn-off 302, the identical circuit delay time T of process when not collinear voltage is imported
dThe former limit peak point current I that the back is actual
PKEquate, thereby system's output current is identical when the mode by line voltage compensation realizes not collinear voltage input.
Need to prove feedback signal V
FbBy behind the voltage error controller 320, can produce asserts signal simultaneously, the output terminal end Q of R-S trigger 321 can open switching tube 302 by driving circuit.
With reference to shown in Figure 7, in present embodiment, described line voltage compensation module 323 a connection example in practice, as can be seen, described line voltage compensation module can comprise:
First in-phase adder and first switch 406;
The described first addition musical instruments used in a Buddhist or Taoist mass is used for detected line voltage is suitably changed afterwards and the shutoff reference voltage that presets is weighted addition, to obtain the shutoff threshold voltage;
Described first switch 406, being used at PFM is the described first in-phase adder continuous firing of Time Triggered of high level;
The output terminal of described first in-phase adder links to each other with the negative input end that turn-offs comparer by described first switch, is used for turn-offing threshold voltage to turn-offing comparer output;
Described first in-phase adder can comprise: first operational amplifier 405, first resistance 401, second resistance 402, the 3rd resistance 403 and the 4th resistance 404;
Described first resistance 401 is connected between the positive input terminal of feedback signal and described first operational amplifier;
Described second resistance 402 is connected between the positive input terminal of the shutoff reference voltage signal that presets and described first operational amplifier;
Described the 3rd resistance 403 is connected between the negative input end of ground wire and described first operational amplifier;
Described the 4th resistance 404 is connected between the negative input end and output terminal of described first operational amplifier.
The output terminal of described shutoff comparer 318 links to each other described V by after the LEB module with the reset terminal of R-S trigger
CSBe connected to the positive input terminal of described shutoff comparer.
In the utility model, feedback signal (FB) the detection line voltage signal during by the power switch pipe conducting of former limit, after then line voltage suitably being changed with a fixing reference voltage V
Ref0Addition obtains the voltage V with the line change in voltage
Ref, with V
RefAs the threshold voltage that turn-offs comparer 318, with V
CSRelatively obtain cut-off signals, process circuit delay time T when not collinear voltage is imported
dThe former limit peak point current I that the back is actual
PKEquate, thereby system's output current is identical when realizing not collinear voltage input.As can be seen, in the present embodiment, do not use off chip resistor, and compared with prior art, simplified peripheral circuit design and composition, reduced the total system cost, reduced system bulk, also promote the reliability of entire circuit system, also reduced the electric current of off chip resistor loss simultaneously, promoted system effectiveness.
With reference to shown in Figure 8, be another connection example of present embodiment neutral voltage compensating module, described line voltage compensation module 323 can also comprise the 5th resistance 407, second switch 408;
One end of described the 5th resistance 407 connects feedback signal, and the other end connects second switch 408;
One end of described second switch 408 connects the 5th resistance 407, and the other end connects ground wire;
Described second switch 408 is used to control described the 5th resistance 407 to produce described feedback signal, and the outer divider resistance 309,310 of trimmer can be adjusted the compensation rate of shutoff comparator threshold to adapt to different transformers and power switch pipe;
When realizing the described circuit of present embodiment, during power switch pipe 302 conductings of former limit, the PFM signal is a high level, switch 406,408 conductings, described resistance 407 and resistance 310 in parallel afterwards again with resistance 309 dividing potential drops, at this moment, the feedback voltage that can obtain feedback signal is
Wherein, N
AUXBe the ancillary coil number of turn.Feedback voltage V as can be seen from this formula
FbWith line voltage V
InBe directly proportional, and be negative value.
Simultaneously, can be as can be seen by the circuit of Fig. 8, the threshold voltage that turn-offs comparer after the compensation can be expressed as:
At circuit delay time T
dInterior V
CSThe value that increases can be expressed as:
L wherein
PBe the primary coil inductance value.Therefore through T
dThe actual shutoff voltage in back can be expressed as:
Therefore, can draw the shutoff penalty coefficient by above-mentioned analysis
Draw corresponding K value according to different systematic parameters and just can select 401～404 value, thereby realize line voltage compensation in practice.
V when Fig. 9 is the integrated line voltage compensation of the utility model monolithic
CSWaveform with the threshold voltage that turn-offs comparer.Figure intermediate cam ripple is V
CSWaveform, solid line V
RefBe 318 shutoff threshold voltage, dotted line V
SdBe process T
dShi Ji shutoff voltage afterwards.Can be not collinear as seen from the figure the crest voltage V of former frontier inspection measuring resistance 303 during the voltage input
PKIdentical, promptly former limit peak point current I
PKIdentical, realized the requirement of output steady current when not collinear voltage is imported.
Need to prove that when switching tube 302 turn-offed, the PFM signal was a low level, switch 406,408 turn-offs, and the line voltage compensation circuit is not worked.This moment feedback signal V
FbBe positive voltage, be used for controlling voltage error controller 320.
Described line voltage compensation module reduction periphery circuit design, reduced system cost, reduced system bulk.Reduce the electric current of resistance consumption simultaneously, further promoted system effectiveness.
Second embodiment:
Referring to Figure 10, this figure is the utility model second embodiment circuit diagram.
In the present embodiment, described former limit power switch pipe 302 is bipolar (Bipolar) transistor npn npn, at this moment, in described line voltage compensation module, also needs to produce a pre-shutoff threshold voltage V with the line change in voltage
Ref_pre, this turn-offs threshold voltage V in advance
Ref_preIdentical with the producing method of described shutoff threshold voltage, just can be so that the pre-turn-off time when the pre-turn-off time is lower than line voltage when making line voltage high is long, the electric charge that base-emitter gathers in the time of so just allowing actual cut-off signals arrive has all just been put.With reference to Figure 10, turn-off comparer 317 in advance and pass through V
CSWith the pre-shutoff threshold voltage V after the compensation
Ref_preRelatively produce pre-cut-off signals.
With reference to shown in Figure 11, as can be seen, described line voltage compensation module can also comprise simultaneously:
Second in-phase adder and the 3rd switch 414;
The described second addition musical instruments used in a Buddhist or Taoist mass is used for detected line voltage is suitably changed afterwards and the pre-shutoff reference voltage that presets is weighted addition, to obtain and the similarly pre-threshold voltage that turn-offs of described shutoff threshold voltage;
Described the 3rd switch 414, being used at PFM is the described second in-phase adder continuous firing of Time Triggered of high level;
The output terminal of described second in-phase adder links to each other with the negative input end of pre-shutoff comparer by described the 3rd switch, is used for to the pre-threshold voltage that turn-offs of pre-shutoff comparer output;
Described second in-phase adder comprises: second operational amplifier 413, the 6th resistance 409, the 7th resistance 410, the 8th resistance 411 and the 9th resistance 412;
Described the 6th resistance 409 is connected between the positive input terminal of feedback signal and described second operational amplifier;
Between the pre-shutoff reference voltage signal that described the 7th resistance 410 presets and the positive input terminal of described second operational amplifier;
Described the 8th resistance 411 is connected between the negative input end of ground wire and described second operational amplifier;
Described the 9th resistance 412 is connected between the negative input end and output terminal of described second operational amplifier.
The output terminal of described pre-shutoff comparer 317 links to each other with driving circuit, described V
CSBe connected to the positive input terminal of described pre-shutoff comparer.
In the present embodiment, suppose V
In1＞V
In2, then, also need satisfy Δ t for system's output current after realizing compensation equates
1＞Δ t
2, can adopt following inequality to represent:
Simultaneously because V
Ref_pre0-K
PreV
Fb＜V
Ref0-KV
FbSo, satisfy in the present embodiment
Can realize that the pre-turn-off time when the pre-turn-off time was lower than line voltage when line voltage was high is long.
Figure 12 is the V that adopts NPN transistor in the present embodiment
CSWith the waveform that turn-offs, turn-offs in advance the threshold voltage of comparer.Figure intermediate cam ripple is V
CSWaveform, solid line V
Ref_preAnd V
RefBe respectively 317 and 318 pre-shutoff threshold voltage and turn-off threshold voltage, dotted line V
Sd_preAnd V
SdBe respectively through T
dShi Ji pre-shutoff voltage and shutoff voltage afterwards.Can be high as seen from the figure the pre-turn-off time Δ t during line voltage length during than low line voltage, and the crest voltage V of former frontier inspection measuring resistance 303 during the input of not collinear voltage
PKIdentical, promptly former limit peak point current I
PKIdentical, realized the requirement of output steady current when not collinear voltage is imported.
The above only is preferred embodiment of the present utility model, is not the utility model is done any pro forma restriction.Though the utility model discloses as above with preferred embodiment, yet be not in order to limit the utility model.Any those of ordinary skill in the art, do not breaking away under the technical solutions of the utility model scope situation, all can utilize the method and the technology contents of above-mentioned announcement that technical solutions of the utility model are made many possible changes and modification, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical solutions of the utility model, all still belongs in the scope of technical solutions of the utility model protection any simple modification, equivalent variations and modification that above embodiment did according to technical spirit of the present utility model.
Claims (9)
1. control the circuit that constant current is exported in a Switching Power Supply, it is characterized in that, comprise: the line voltage compensation module, feedback signal detection line voltage when described line voltage compensation module is used for according to the power switch pipe conducting of former limit, and described line voltage and the shutoff reference voltage that presets handled the shutoff threshold voltage that changes with the variation of described line voltage with output according to presetting rule;
Wherein, first output terminal of described line voltage compensation module links to each other with the negative input end that turn-offs comparer, and described feedback signal and the shutoff reference voltage that presets are connected to two input ends of described line voltage compensation module.
2. circuit according to claim 1 is characterized in that, the positive input terminal of described shutoff comparer and V
CSLink to each other, the output terminal of described shutoff comparer links to each other with a R-S trigger.
3. circuit according to claim 1 is characterized in that, described line voltage compensation module comprises: first in-phase adder and first switch;
Described first in-phase adder is used for detected line voltage is suitably changed afterwards and the shutoff reference voltage that presets is weighted addition, to obtain described shutoff threshold voltage;
The output terminal of described first in-phase adder links to each other with the negative input end that turn-offs comparer by described first switch; Described first switch, being used at PFM is the described first in-phase adder continuous firing of Time Triggered of high level.
4. circuit according to claim 3 is characterized in that, described first in-phase adder comprises: first operational amplifier, first resistance, second resistance, the 3rd resistance and the 4th resistance;
Described first resistance is connected between the positive input terminal of feedback signal and described first operational amplifier;
Described second resistance is connected between the positive input terminal of the shutoff reference voltage signal that presets and described first operational amplifier;
Described the 3rd resistance is connected between the negative input end of ground wire and described first operational amplifier;
Described the 4th resistance is connected between the negative input end and output terminal of described first operational amplifier.
5. circuit according to claim 3 is characterized in that, described circuit also comprises: the 5th resistance, and an end of described the 5th resistance connects feedback signal, and the other end connects the second switch of described line voltage compensation module;
Then described line voltage compensation module also comprises second switch, and described second switch is used to control described the 5th resistance to produce described feedback signal;
One end of described second switch connects the 5th resistance of described line voltage compensation module, other end ground connection.
6. according to each described circuit of claim 1-5, it is characterized in that described former limit power switch pipe is a metal-oxide-semiconductor.
7. circuit according to claim 1 is characterized in that, described former limit power switch pipe is a bipolar transistor, and then described line voltage compensation circuit also comprises:
Second in-phase adder and the 3rd switch;
The described second addition musical instruments used in a Buddhist or Taoist mass is used for detected line voltage is suitably changed afterwards and the pre-shutoff reference voltage that presets is weighted addition, to obtain pre-shutoff threshold voltage;
Described the 3rd switch, being used at PFM is the described second in-phase adder continuous firing of Time Triggered of high level;
The output terminal of described second in-phase adder links to each other with the negative input end of pre-shutoff comparer by described the 3rd switch.
8. circuit according to claim 7 is characterized in that, described second in-phase adder comprises: second operational amplifier, the 6th resistance, the 7th resistance, the 8th resistance and the 9th resistance;
Described the 6th resistance is connected between the positive input terminal of feedback signal and described second operational amplifier;
Between the pre-shutoff reference voltage signal that described the 7th resistance presets and the positive input terminal of described second operational amplifier;
Described the 8th resistance is connected between the negative input end of ground wire and described second operational amplifier;
Described the 9th resistance is connected between the negative input end and output terminal of described second operational amplifier.
9. circuit according to claim 2 is characterized in that the output terminal of described pre-shutoff comparer links to each other with driving circuit, described V
CSBe connected to the positive input terminal of described pre-shutoff comparer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201532433U CN201477463U (en) | 2009-06-03 | 2009-06-03 | Circuit in switch power supply for controlling constant-current output |
Applications Claiming Priority (1)
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