CN207460001U - Switching power source control circuit - Google Patents
Switching power source control circuit Download PDFInfo
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- CN207460001U CN207460001U CN201721448426.9U CN201721448426U CN207460001U CN 207460001 U CN207460001 U CN 207460001U CN 201721448426 U CN201721448426 U CN 201721448426U CN 207460001 U CN207460001 U CN 207460001U
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- main switch
- moment
- shut
- switch pipe
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Abstract
The utility model discloses a kind of switching power source control circuits, circuit or/and the second adjusting circuit are adjusted including first, described first adjusts circuit, the first voltage signal of main switch and the public terminal voltage of auxiliary switch pipe will be characterized compared with the first reference signal, obtain the first comparison signal, whether the first comparison signal characterization adjusts the first dead time, and first dead time opens the time at moment for the main switch shut-off moment to auxiliary switch pipe；Described second adjusts circuit, the first voltage signal of main switch and the public terminal voltage of auxiliary switch pipe will be characterized compared with the second reference signal, obtain the second comparison signal, whether the second comparison signal characterization adjusts the second dead time, and switching tube turns off the time that moment to main switch opens the moment supplemented by second dead time.For the utility model when adjusting dead time, response is fast, and reliability is high.
Description
Technical field
The utility model is related to a kind of power electronics field, more particularly to a kind of switching power source control circuit.
Background technology
In Switching Power Supply, it is related to the occasion of Synchronization Control, since the phenomenon that switching tube is straight-through cannot occur, so needing
Dead time is set.Two switching tubes of Synchronization Control cannot simultaneously turn on, and otherwise just be present with the situation of short circuit.In order to make out
Pipe reliable operation is closed, avoids due to turn-off delay effect two switching tubes being caused to lead directly to, it is necessary to dead time is set, that is,
The time that two switching tubes simultaneously turn off.A switching tube caused by dead time can be effectively prevented from delay effect is not complete
Shut-off, and another switching tube is in the conduction state.But dead time is long to reduce power supply delivery efficiency, can to control
Circuit is interfered to influence circuit normal work and generates latch-up to cause circuit malfunction.
In the prior art, exemplified by adjusting Buck circuit dead times, refering to what is shown in Fig. 1, the dead zone of the prior art is adjusted
Circuit includes first comparator U01, the second comparator U02 and control circuit U03.Buck circuits include upper tube M1, down tube M2, electricity
Sense L and capacitance C, described upper tube M1 one end are connected with down tube M2 one end, and public terminal voltage is Vsw, and another terminations of upper tube M1 are defeated
Enter voltage Vin, down tube M2 other ends ground connection.Inductance L one end connects Vsw, another termination capacitor C one end, another terminations of capacitance C
Ground.First comparator U01 normal phase input ends receive Buck circuit down tube M2 gate voltage signal Vgb, and negative-phase input receives base
Calibration signal 0 exports the first comparison signal；Second comparator normal phase input end receives Vsw voltage signals, and negative-phase input receives ginseng
Vref is examined, exports the second comparison signal.The control circuit U03 receives the first comparison signal and the second comparison signal, output control
The control signal of upper, lower tube MI, M2 break-make processed, and then control the dead time between upper, lower tube M1 and M2.
When the grid voltage Vgb of down tube drops to 0, open upper tube so as to set down tube shut-off the moment and upper tube open when
Dead time between quarter；When voltage Vsw at upper, lower tube common port is dropped to reference to Vref, down tube is opened so as to set
Upper tube shut-off moment and down tube open the dead time between the moment.This switching power source control circuit has very big delay,
And dead time can change with the variation of temperature and technique, cause the uniformity between chip poor, circuit reliability is poor.
The content of the invention
In view of this, the purpose of this utility model is to provide a kind of switching power source control circuit and control method, for solving
The technical issues of dead zone certainly existing in the prior art adjusts delay, circuit reliability is poor.
To achieve the above object, the utility model provides a kind of switching power source control circuit, including：
First adjusts circuit or/and the second adjusting circuit；
Described first adjusts circuit, will characterize the first voltage signal and the of main switch and the public terminal voltage of auxiliary switch pipe
One reference signal compares, and obtains the first comparison signal, whether the first comparison signal characterization adjusts the first dead time, described
First dead time opens the time at moment for the main switch shut-off moment to auxiliary switch pipe；
Described second adjusts circuit, will characterize the first voltage signal and the of main switch and the public terminal voltage of auxiliary switch pipe
Two reference signals compare, and obtain the second comparison signal, whether the second comparison signal characterization adjusts the second dead time, described
Switching tube shut-off moment to main switch opens the time at moment supplemented by second dead time
Optionally, described first adjust circuit and include first comparator, the first comparator first end receives described the
One voltage signal, second end receive first reference signal, within a period of time after main switch turns off the moment, to first
Voltage signal and the first reference signal are compared to export first comparison signal；If the first comparison signal judgement need into
The first dead time of row is adjusted, then adjusts the main switch shut-off moment or auxiliary switch pipe opens the moment.
Optionally, the first adjusting circuit further includes the first impulse generator, and first impulse generator receives master
The pwm signal of switching tube exports the first pulse signal, after the first pulse signal pulsewidth characterization main switch shut-off moment
For a period of time.
Optionally, the first adjusting circuit further includes first and door, described first compared with door reception described first letter
Number and first pulse signal, export the first logical signal.
Optionally, the first adjusting circuit further includes when adjusting auxiliary switch pipe and opening moment or/and main switch and turn off
The first adjustment module carved, first adjustment module receive auxiliary switch pipe pwm signal or/and main switch pwm signal and institute
The first logical signal is stated, the auxiliary switch pipe that output adjusts the first dead time opens Regulate signal or/and main switch shut-off tune
Save signal.
Optionally, described second adjust circuit and include the second comparator, the second comparator first end receives described the
One voltage signal, second end receive second reference signal, within a period of time after auxiliary switch pipe turns off the moment, to first
Voltage signal and the second reference signal are compared to export second comparison signal；If the second comparison signal judgement need into
The second dead time of row is adjusted, then adjusts the auxiliary switch pipe shut-off moment or main switch opens the moment.
Optionally, the second adjusting circuit further includes the second impulse generator, and second impulse generator receives auxiliary
The pwm signal of switching tube exports the second pulse signal, after the second pulse signal pulsewidth characterization auxiliary switch pipe shut-off moment
For a period of time.
Optionally, the second adjusting circuit further includes second and door, described second compared with door reception described second letter
Number and second pulse signal, export the second logical signal.
Optionally, the second adjusting circuit, which further includes, adjusts the auxiliary switch pipe shut-off moment or/and when main switch is opened
The second adjustment module carved, second adjustment module receive auxiliary switch pipe pwm signal or/and main switch pwm signal and institute
The second logical signal is stated, the auxiliary switch pipe that output adjusts the second dead time opens Regulate signal or/and main switch shut-off tune
Save signal.
Optionally, the on-off circuit further includes logic circuit, and it is open-minded that the logic circuit receives the auxiliary switch pipe
Regulate signal or/and auxiliary switch pipe shut-off Regulate signal or/and main switch shut-off Regulate signal or/and the master
Switching tube opens Regulate signal, exports the pwm signal of auxiliary switch pipe and the pwm signal of main switch.
Compared with prior art, the technical solution of the utility model has the following advantages：It characterization main switch and auxiliary will open
The first voltage signal for managing public terminal voltage is closed compared with the first reference signal, obtains the first comparison signal, described first compares
Whether characterization adjusts the first dead time；The first voltage signal of main switch and the public terminal voltage of auxiliary switch pipe will be characterized
Compared with the second reference signal, the second comparison signal is obtained, whether the second comparison signal characterization adjusts the second dead time；
When adjusting the first dead time, can only adjust auxiliary switch pipe opens the moment, can also only adjust the shut-off moment of main switch, also
Opening moment and the shut-off moment of main switch for auxiliary switch can be adjusted simultaneously, adjust the second dead time similarly.This practicality
New is not in delay when adjusting delay time, be not between chip uniformity difference and circuit reliability difference ask
Topic.
Description of the drawings
Fig. 1 is prior art switching power source control circuit structure diagram；
Fig. 2 is the dead zone schematic diagram in Switching Power Supply；
Fig. 3 is the utility model switching power source control circuit structure diagram；
Fig. 4 is the first adjusting electrical block diagram in Fig. 3；
Fig. 5 is the second adjusting electrical block diagram in Fig. 3；
Fig. 6 adjusts waveform diagram for the utility model Switching Power Supply dead zone；
Specific embodiment
The preferred embodiment of the utility model is described in detail below in conjunction with attached drawing, but the utility model is not merely
It is limited to these embodiments.The utility model covers any replacement made in the spirit and scope of the utility model, modification, equivalent
Method and scheme.
In order to which the public is made to have thorough understanding to the utility model, in following the preferred embodiment in the utility model specifically
Understand concrete details, and description without these details can also understand that this practicality is new completely for a person skilled in the art
Type.
The utility model is more specifically described by way of example referring to the drawings in the following passage.It should be noted that attached drawing
Using more simplified form and using non-accurate ratio, only to it is convenient, lucidly aid in illustrating the utility model
The purpose of embodiment.
As shown in Fig. 2, the dead zone schematic diagram in the utility model Switching Power Supply is illustrated, switching tube arteries and veins supplemented by wherein PWML
Wide modulation waveform, PWMH are main switch pulse-width modulation waveform, and Vsw is the voltage wave at main switch and auxiliary switch pipe common port
Shape, Vref1, Vref2 are the first reference signal and the second reference signal.Time when PWML and PWMH is low level is dead zone
Time, i.e., the time that main and auxiliary switching tube simultaneously turns off, main switch turns off to auxiliary switch pipe the time opened when being the first dead zone
Between, it is the second dead time that auxiliary switch pipe, which turns off to main switch the time opened,.
As shown in figure 3, illustrate the utility model switching power source control circuit structure diagram, the Switching Power Supply with
Exemplified by Buck circuits, the control circuit includes first and adjusts the adjusting circuit U 302 of circuit U 301, second and logic circuit U303.
The Buck circuits include upper tube M1, down tube M2, inductance L and capacitance C, described upper tube M1 one end and are connected with down tube M2 one end,
Public terminal voltage be first voltage Vsw, another termination input voltage vins of upper tube M1, the down tube M2 other ends ground connection.Inductance L one end
Connect Vsw, another termination capacitor C one end, capacitance C other ends ground connection.Described first, which adjusts circuit U 301 and described second, is adjusted
Circuit U 302 receives PWML signals, PWMH signals and voltage Vsw respectively, described first adjust circuit output PWML1 signals or/and
PWMH1 signals, described second adjusts circuit output PWML2 signals or/and PWMH2 signals；Described in the logic circuit U303 is received
PWML1 signals or/and the PWMH1 signals or/and PWML2 signals or/and the PWMH2 signals, output auxiliary switch pipe M2 and
The pwm signal of main switch M1.By adjust the pwm signal of main switch M1 or/and the last switch periods of auxiliary switch pipe M2 come
The pwm signal of main switch M1 or/and auxiliary switch pipe M2 current switch periods is obtained, and then the switch of de-regulation Buck circuits is dead
Area's time.The PWML signals and PWMH signals are respectively last switch periods auxiliary switch pipe M2 and the last switches of main switch M1
The pwm signal in cycle, the PWML1 signals and the PWML2 signals are respectively that PWML signals rising edge and PWML signals decline
Signal along after adjusting, i.e. auxiliary switch pipe M2's opens Regulate signal and turns off Regulate signal, PWMH1 signals and described
PWMH2 signals are respectively the shut-off of the signal, i.e. main switch M1 after PWMH signals trailing edge and the adjusting of PWMH signals rising edge
Regulate signal and open Regulate signal.
As shown in figure 4, the first adjusting electrical block diagram in Fig. 3 is illustrated, including the first comparison circuit U401, first
Impulse generator U402, first and door U403 and auxiliary switch pipe are opened or/and main switch shut-off adjusts circuit U 404.Described
One comparison circuit U401 normal phase input ends receive the first reference signal Vref1, inverting input input first voltage signal Vsw,
Export the first comparison signal comp1；First impulse generator U402 the input signal PWMH, output pulse signal pulse1；
It is described to receive the first comparison signal comp1 and the first pulse signal pulse1 with door U403, export the first logical signal
logic1；The circuit U 404 that adjusts receives auxiliary switch pipe M2 or/and the pulsewidth modulation letter of the last switch periods of main switch M1
Number PWML or/and PWMH and the first logical signal logic1, output auxiliary switch pipe open Regulate signal PWML1 or/and main switch
Pipe shut-off Regulate signal PWMH1.
When the first reference signal Vref1 is more than first voltage signal Vsw, comparator U401 output high level signals
comp1；When trailing edge occurs in main switch M1 pulse-modulated signals PWMH, the first impulse generator U402 exports one high electricity
There is a period of time after trailing edge in flat pulse signal pulse1, the pulse signal pulse1 pulsewidths characterization PWMH signals；When
When signal comp1 and signal pulse1 are high level, i.e., in the first dead time, there are one section of Vref1 more than Vsw when
Between, that is, show that the first dead time is long (with reference to Fig. 2).First receives high level signal comp1 and pulse with door U403, defeated
Go out high level logic signal logic1, by adjusting circuit U 404 PWML signals rising edge is controlled to be exported in advance (with reference in Fig. 6
PWML1 waveforms) or/and PWMH trailing edge delay output, that is, reduce the first dead time.
As shown in figure 5, the second adjusting electrical block diagram in Fig. 3 is illustrated, including the second comparison circuit U501, second
Impulse generator U502, second and door U503 and the shut-off of auxiliary switch pipe or/and main switch are opened and adjust circuit U 504.Described
Two comparison circuit U501 normal phase input ends receive the second reference signal Vref2, inverting input input first voltage signal Vsw,
Export the second comparison signal comp2；Second impulse generator U502 the input signal PWML, output pulse signal pulse2；
It is described to receive the second comparison signal comp2 and the second pulse signal pulse2 with door U503, export the first logical signal
logic2；The circuit U 504 that adjusts receives auxiliary switch pipe M2 or/and the pulsewidth modulation letter of the last switch periods of main switch M1
Number PWML or/and PWMH and the first logical signal logic1, output auxiliary switch pipe shut-off Regulate signal PWML1 or/and main switch
Pipe opens Regulate signal PWMH1.
When the second reference signal Vref2 is more than first voltage signal Vsw, comparator U501 output high level signals
comp2；When trailing edge occurs in auxiliary switch pipe M2 pulse-width signals PWML, the second impulse generator U502 exports one high electricity
There is a period of time after trailing edge in the pulsewidth characterization PWML signals of flat pulse signal pulse2, the pulse signal pulse2；
When signal comp2 and signal pulse2 are high level, i.e., in the second dead time, there are one section of Vref2 more than Vsw's
Time shows that the second dead time is long (with reference to Fig. 2).Second receives high level signal comp2 and pulse2 with door U503,
High level logic signal logic2 is exported, the delay output of PWML signals trailing edge is controlled (with reference in Fig. 6 by adjusting circuit U 504
PWML2 waveforms) or/and the rising edge of PWMH export in advance, that is, reduce the second dead time.
With reference to Fig. 6, illustrate the utility model switching dead and adjust oscillogram, with reference to above example schematic diagram, wherein
Switching tube pulse-width modulation waveform supplemented by PWML, PWMH are main switch pulse-width modulation waveform, and switching tube opens adjusting supplemented by PWML1
Signal, i.e., the signal that PWML rising edges export in advance；Switching tube turns off Regulate signal supplemented by PWML2, i.e. PWML trailing edges are delayed
The signal of output；Pwm signal after switching tube M2 is adjusted supplemented by PWML-next, the PWML-next signals are believed according to PWML1
Number and PWML2 obtain.Time when PWML-next and PWMH is low level is dead time after adjusting.The utility model institute
The dead zone regulating time stated can only adjust the first dead time, can also only adjust the second dead time, can also adjust simultaneously
Save the first dead time and the second dead time；When adjusting the first dead time, can only adjust auxiliary switch pipe opens the moment,
The shut-off moment of main switch can be only adjusted, when can also adjust the shut-off for opening moment and main switch of auxiliary switch simultaneously
It carves；Adjust the second dead time similarly.
Although embodiment is separately illustrated and is illustrated above, it is related to the common technology in part, in ordinary skill
Personnel apparently, can be replaced and integrate between the embodiments, be related to one of embodiment and the content recorded is not known, then
It can refer to another embodiment on the books.
Embodiments described above does not form the restriction to the technical solution protection domain.It is any in above-mentioned implementation
Modifications, equivalent substitutions and improvements made within the spirit and principle of mode etc., should be included in the protection model of the technical solution
Within enclosing.
Claims (10)
1. a kind of switching power source control circuit, including：
First adjusts circuit or/and the second adjusting circuit；
Described first adjusts circuit, will characterize the first voltage signal and the first ginseng of main switch and the public terminal voltage of auxiliary switch pipe
It examines signal to compare, obtains the first comparison signal, whether first comparison signal characterizes adjusts the first dead time, and described first
Dead time opens the time at moment for the main switch shut-off moment to auxiliary switch pipe；
Described second adjusts circuit, will characterize the first voltage signal and the second ginseng of main switch and the public terminal voltage of auxiliary switch pipe
It examines signal to compare, obtains the second comparison signal, whether second comparison signal characterizes adjusts the second dead time, and described second
Switching tube shut-off moment to main switch opens the time at moment supplemented by dead time.
2. switching power source control circuit according to claim 1, it is characterised in that：Described first, which adjusts circuit, includes first
Comparator, the first comparator first end receive the first voltage signal, and second end receives first reference signal,
In a period of time after the main switch shut-off moment, first voltage signal and the first reference signal are compared with described in output
First comparison signal；If the judgement of the first comparison signal needs to carry out the first dead time adjusting, when adjusting main switch shut-off
It carves or auxiliary switch pipe opens the moment.
3. switching power source control circuit according to claim 2, it is characterised in that：The first adjusting circuit further includes the
One impulse generator, first impulse generator receive the pwm signal of main switch, export the first pulse signal, and described the
A period of time after the one pulse signal pulsewidth characterization main switch shut-off moment.
4. switching power source control circuit according to claim 3, it is characterised in that：The first adjusting circuit further includes the
One and door, described first receives first comparison signal and first pulse signal with door, exports the first logical signal.
5. switching power source control circuit according to claim 4, it is characterised in that：The first adjusting circuit further includes tune
Section auxiliary switch pipe opens first adjustment module at moment or/and main switch shut-off moment, and first adjustment module receives auxiliary
Switching tube pwm signal or/and main switch pwm signal and first logical signal, output adjust the auxiliary of the first dead time
Switching tube opens Regulate signal or/and main switch shut-off Regulate signal.
6. switching power source control circuit according to claim 1, it is characterised in that：Described second, which adjusts circuit, includes second
Comparator, the second comparator first end receive the first voltage signal, and second end receives second reference signal,
In a period of time after the auxiliary switch pipe shut-off moment, first voltage signal and the second reference signal are compared with described in output
Second comparison signal；If the judgement of the second comparison signal needs to carry out the second dead time adjusting, when adjusting the shut-off of auxiliary switch pipe
It carves or main switch opens the moment.
7. switching power source control circuit according to claim 6, it is characterised in that：The second adjusting circuit further includes the
Two impulse generators, second impulse generator receive the pwm signal of auxiliary switch pipe, export the second pulse signal, and described the
A period of time after the two pulse signal pulsewidths characterization auxiliary switch pipe shut-off moment.
8. switching power source control circuit according to claim 7, it is characterised in that：The second adjusting circuit further includes the
Two and door, described second receives second comparison signal and second pulse signal with door, exports the second logical signal.
9. switching power source control circuit according to claim 8, it is characterised in that：The second adjusting circuit further includes tune
Section auxiliary switch pipe shut-off moment or/and main switch open second adjustment module at moment, and second adjustment module receives auxiliary
Switching tube pwm signal or/and main switch pwm signal and second logical signal, output adjust the auxiliary of the second dead time
Switching tube opens Regulate signal or/and main switch shut-off Regulate signal.
10. the switching power source control circuit according to claim 5 or 9, it is characterised in that：The on-off circuit further includes
Logic circuit, the logic circuit receive the auxiliary switch pipe and open Regulate signal or/and auxiliary switch pipe shut-off adjusting
Signal or/and main switch shut-off Regulate signal or/and the main switch open Regulate signal, output auxiliary switch pipe
The pwm signal of pwm signal and main switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721448426.9U CN207460001U (en) | 2017-11-02 | 2017-11-02 | Switching power source control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721448426.9U CN207460001U (en) | 2017-11-02 | 2017-11-02 | Switching power source control circuit |
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| Publication Number | Publication Date |
|---|---|
| CN207460001U true CN207460001U (en) | 2018-06-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721448426.9U Active CN207460001U (en) | 2017-11-02 | 2017-11-02 | Switching power source control circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107834849A (en) * | 2017-11-02 | 2018-03-23 | 杰华特微电子（张家港）有限公司 | Switching power source control circuit and control method |
-
2017
- 2017-11-02 CN CN201721448426.9U patent/CN207460001U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107834849A (en) * | 2017-11-02 | 2018-03-23 | 杰华特微电子（张家港）有限公司 | Switching power source control circuit and control method |
| CN107834849B (en) * | 2017-11-02 | 2024-03-19 | 杰华特微电子（张家港）有限公司 | Switching power supply control circuit and control method |
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