CN109617429A - Voltage converter ic, high pressure BUCK converter and control method - Google Patents
Voltage converter ic, high pressure BUCK converter and control method Download PDFInfo
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- CN109617429A CN109617429A CN201910140949.4A CN201910140949A CN109617429A CN 109617429 A CN109617429 A CN 109617429A CN 201910140949 A CN201910140949 A CN 201910140949A CN 109617429 A CN109617429 A CN 109617429A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
Abstract
Disclose a kind of voltage converter ic, high pressure BUCK switch converters and the control method for controlling high pressure BUCK switch converters.The voltage converter ic is integrated with power switch, and the input pin of the drain electrode coupling integrated circuit of the power switch, source electrode couples the ground pin of integrated circuit.The integrated circuit further includes detection pin.When the freewheeling diode afterflow being coupled in outside IC ground pin ends the discontinuous current flowed through, integrated circuit detects pin at it and generates a clamp voltage, when clamp voltage value is equal to the value of output voltage when freewheeling diode afterflow ends, floating detects pin.When the voltage in ground pin is lower than one heavily loaded threshold value of clamp voltage, conducting power switch.The integrated circuit can be used for non-isolated high pressure BUCK switch converters, can quickly detect load variation, be conducive to the dynamic responding speed of raising system.
Description
Technical field
The present invention relates to electronic circuits, and in particular to a kind of integrated circuit converter, high pressure buck converter and its control
Method.
Background technique
It is depressured application occasion in high pressure, power governor (such as switch mode voltage regulators) is widely used in various electricity
In sub- equipment.Non-isolated high pressure step-down switching converter is because its circuit is simple, peripheral circuit element is few, loss is small and fever is low
The features such as, it is widely used in the circuits such as small household appliances control panel power supply, Industry Control power supply power supply, LED illumination.
For example, Fig. 1 shows the electrical block diagram of a traditional non-isolated AC-DC switch converters.This it is non-every
It include rectification circuit, input filter capacitor C from AC-DC switch convertersINWith high pressure BUCK switching circuit.Wherein, high pressure BUCK
Switching circuit includes integrated circuit 51, diode D, outputting inductance LOUT, output capacitance COUTWith feed circuit 52.
In general, integrated circuit 51 includes input pin IN, feedback pin FB and ground pin GND2.Inside integrated circuit 51
Including a power switch tube, the drain electrode of the power switch tube couples input pin IN, and the source electrode of the power switch tube couples core
Piece ground pin GND2, and it is electrically connected to by diode D the logically GND1 of non-isolated AC-DC switch converters.Feedback pipe
Foot FB receives the output voltage signal V for representing output end OUTOUTFeedback signal, and based on the feedback signal control power open
The turn-on and turn-off of pipe are closed, and then by input capacitance CINThe DC input voitage V at both endsDCBe converted to output voltage signal VOUT。
In non-isolated AC-DC switch converters shown in fig. 1, due to the ground pin GND2 and AC- of integrated circuit 51
The logically GND1 of DC switch converters is two different current potentials, therefore, it is difficult to directly in real time acquisition output voltage signal VOUT
It send to integrated circuit 51 and is controlled to adjust.In general, we are coupled in output end OUT and integrated electricity using a feed circuit 52
Between 51 ground pin GND2 of road.When the main switch shutdown in integrated circuit 51, when diode D afterflow is connected, integrated circuit
51 ground pin GND2 is electrically connected with logically GND1, at this point, having one between ground pin GND2 and logically GND1
Fixed voltage is poor (conduction voltage drop of diode D), and therefore, the feedback signal that feed circuit 51 generates can represent output voltage signal
VOUT。
But when non-isolated AC-DC switching converter operation is in underloading or zero load, the voltage of feedback pin FB is zero,
The voltage and output voltage signal V of ground pin GND2OUTValue it is equal, output voltage signal VOUTBy output capacitance COUTElectric discharge
It maintains.At the same time, in order to improve efficiency, system would generally enter frequency modulation mode, and system operating frequency is very low.Once being
System reverts to when overloaded from underloading or zero load, since received feedback signal is upper period diode current flow on feedback pin FB
Period acquisition, cannot in time reaction load variation, simultaneously as working frequency is very low, next switching cycle will not be at once
It arrives, therefore causes system's transient response speed slow.Output capacitance COUTIt is not enough to maintain the demand of load, output voltage letter
Number VOUTValue power down it is serious, system cisco unity malfunction.Therefore, for non-isolated AC-DC switch converters system, it will usually
A fictitious load is connected to guarantee that whole system will not work under low-down frequency condition, still, fictitious load will increase again
Power consumption leads to ineffective systems.
Therefore, it is desirable to propose the non-isolated AC-DC switch converters that a kind of transient response speed is fast, low in energy consumption.
Summary of the invention
For one or more problems in the prior art, a kind of voltage converter ic is proposed, high pressure BUCK becomes
Parallel operation and control method.
One aspect of the present invention provides a kind of voltage converter ic for high pressure BUCK switch converters, has defeated
Enter pin and ground pin, wherein high pressure BUCK switch converters include diode, outputting inductance and feed circuit, two poles
The cathode of pipe couples ground pin, and the anode of diode is electrically connected to switch converters logically；Outputting inductance coupling ground connection
Between pin and the output end of switch converters；Feed circuit is connected between the output end of switch converters and ground pin,
And the feedback signal for representing output voltage signal is generated during diode current flow, the voltage converter ic is into one
Step includes: feedback pin, is coupled to feed circuit, receives feedback signal；Pin is detected, switch is electrically connected to by clamp capacitor
Converter is logically；Power switch has first end, second end and control terminal, and it is defeated that first end couples input pin reception
Enter voltage, second end couples ground pin；Afterflow decision circuit, coupling feedback pin receive feedback signal, and according to feedback
Signal generates afterflow and determines signal, and after diode continuousing flow cut-off, afterflow determines that signal is effective；And heavily loaded trigger circuit, coupling
Connect detection pin, ground pin and afterflow decision circuit, after power switch shutdown, heavily loaded trigger circuit connecting detection pin and
Ground pin, and detection pin generate a clamp voltage signal after disconnection detection pin and ground pin connection, wherein
The value of clamp voltage signal is equal to the value of output voltage signal when diode continuousing flow ends, and determines the signal valid period in afterflow,
Voltage signal in clamp voltage signal and ground pin is compared the heavily loaded trigger signal of generation by heavily loaded trigger circuit, works as ground pipe
When the value of voltage signal is lower than one heavily loaded threshold value of value of clamp voltage signal on foot, heavily loaded trigger signal is effective, power switch
Conducting.
Another aspect of the invention provides a kind of high pressure BUCK switch converters, comprising: power switch, have first end,
The first end of second end and control terminal, power switch receives input voltage signal, and the second end of power switch passes through outputting inductance
It is coupled to the output end of switch converters；Freewheeling diode, the second end of the cathode coupling power switch of freewheeling diode, afterflow
The anode of diode is electrically connected to logically；Feed circuit is connected to the second end of power switch and the output of switch converters
End, and the feedback signal for representing output voltage is generated during diode current flow；Afterflow decision circuit receives feedback letter
Number, and generate afterflow based on the feedback signal and determine signal, after diode continuousing flow cut-off, afterflow determines that signal is effective；And again
Trigger circuit is carried, power switch second end and afterflow decision circuit are coupled, determines signal valid period, heavy duty triggering electricity in afterflow
Road generates a clamp voltage signal, wherein the value of clamp voltage signal is equal to output voltage signal when diode continuousing flow ends
Value, heavily loaded trigger circuit by the voltage signal on clamp voltage signal and power switch second end compare generation heavy duty triggering letter
Number, when value one heavily loaded threshold value of the value of voltage signal in power switch second end lower than clamp voltage signal, heavy duty triggering
Signal is effective, power switch conducting.
Another aspect of the invention provides a kind of control method for controlling high pressure BUCK switch converters, and high pressure BUCK is opened
Closing converter includes power switch, diode, outputting inductance, feed circuit and clamp capacitor, and the drain electrode coupling of power switch is opened
The input terminal for closing converter receives input voltage, the cathode of the source electrode coupling diode of power switch, and the anode of diode is electrically connected
It is connected to logically, outputting inductance is coupled between the source electrode of power switch and the output end of switch converters, feed circuit connection
Between the output end of switch converters and the source electrode of power switch, clamp capacitor is coupled in power by a clamp switch and opens
The source electrode of pass and logically between, the control method includes: clamp switch to be connected, and to clamper after power switch shutdown
Capacitor charging；When the voltage value on clamp capacitor is equal to the value of output voltage when diode continuousing flow ends, clamp switch is disconnected；
Compare the voltage on the voltage and power switch source electrode on clamp capacitor；And when the voltage value on power switch source electrode is lower than pincers
When the heavily loaded threshold value of voltage value one on the capacitor of position, conducting power switch.
Detailed description of the invention
In all attached drawings below, identical label indicates there is identical, similar or corresponding feature or function.
Fig. 1 shows the electrical block diagram of a traditional non-isolated AC-DC switch converters；
Fig. 2 shows the schematic block diagrams of non-isolated AC-DC switch converters 10 according to an embodiment of the invention；
Fig. 3 shows the schematic block diagram inside integrated circuit 12 according to an embodiment of the invention；
Fig. 4 shows the circuit diagram inside integrated circuit 12 according to an embodiment of the invention；
Fig. 5 shows the circuit diagram inside integrated circuit 12 according to another embodiment of the present invention；
Fig. 6 shows the circuit diagram of control module according to an embodiment of the invention；
Fig. 7 shows the circuit diagram of control module according to another embodiment of the present invention；
Fig. 8 shows a kind of control method for controlling high pressure BUCK switch converters according to an embodiment of the invention.
Specific embodiment
Specific embodiments of the present invention are described more fully below, it should be noted that the embodiments described herein is served only for illustrating
Illustrate, is not intended to restrict the invention.In the following description, in order to provide a thorough understanding of the present invention, a large amount of spies are elaborated
Determine details.It will be apparent, however, to one skilled in the art that: this hair need not be carried out using these specific details
It is bright.In other instances, in order to avoid obscuring the present invention, well known circuit, material or method are not specifically described.
Throughout the specification, meaning is referred to " one embodiment ", " embodiment ", " example " or " example "
: a particular feature, structure, or characteristic described in conjunction with this embodiment or example is comprised at least one embodiment of the invention.
Therefore, the phrase " in one embodiment ", " in embodiment ", " example " occurred in each place of the whole instruction
Or " example " is not necessarily all referring to the same embodiment or example.Furthermore, it is possible in any suitable combination and or sub-portfolio will be specific
Feature, structure or characteristic combine in one or more embodiment or examples.In addition, those of ordinary skill in the art should manage
Solution, diagram is provided to the purpose of explanation provided herein, and diagram is not necessarily drawn to scale.It should be appreciated that working as
Claim " element " " being connected to " or when " coupled " to another element, it, which can be, is directly connected or coupled to another element or can be with
There are intermediary elements.On the contrary, cental element is not present when claiming element " being directly connected to " or " being directly coupled to " another element
Part.Identical appended drawing reference indicates identical element.Term "and/or" used herein includes that one or more correlations are listed
Any and all combinations of project.
Fig. 2 shows the schematic block diagrams of non-isolated AC-DC switch converters 10 according to an embodiment of the invention.Such as figure
Shown in 2, non-isolated AC-DC switch converters 10 include rectification circuit 11, input filter capacitor CINWith high pressure BUCK switching circuit.
Rectification circuit 11 receives ac voltage signal VAC, ac voltage signal VACPass through the rectification of rectification circuit 11 and input capacitance CIN
D.c. input voltage signal V is obtained after filteringDC.High pressure BUCK switching circuit includes integrated circuit 12, diode D, outputting inductance
LOUT, output capacitance COUTWith feed circuit 13.
Integrated circuit 12 includes input pin IN, ground pin GND2 and feedback pin FB.Include inside integrated circuit 12
One power switch tube, in one embodiment, which includes metal oxide semiconductor field effect tube
(Metal Oxide Semiconductor Field Effect Transistor, MOSFET), technotron
(Junction Field Effect Transistor, JFET), insulated gate bipolar transistor (Insulated Gate
Bipolar Transistor, IGBT) etc. suitable power device.The drain D of the power switch tube couples input pin IN, should
The ground pin GND2 of the source S coupling integrated circuit 12 of power switch tube.The anode coupling of integrated circuit external diode D is opened
Close the logically GND1 of converter 10, the ground pin GND2 of the cathode coupling integrated circuit 12 of diode D.Outputting inductance LOUT
It is coupled between the ground pin GND2 of integrated circuit 12 and the output end OUT of switch converters 10.Output capacitance COUTIt is coupled in
Between output end OUT and logically GND1.Feed circuit 13 is coupled between output end OUT and ground pin GND2, and two
Pole pipe D is generated during being connected and is represented output voltage signal VOUTFeedback signal VFB, and give to the feedback pin of integrated circuit 12
FB.In one embodiment, feed circuit 13 includes the first electricity being connected in series between output end OUT and ground pin GND2
R1 and second resistance R2 is hindered, wherein the common end of first resistor R1 and second resistance R2 are coupled to feedback pin FB and provide feedback letter
Number VFB.During diode D conducting, feedback signal VFBWith output voltage signal VOUTDirect proportionality；When diode D afterflow
When cut-off, inductance L is flowed throughOUTElectric current be zero, feedback signal VFBEqual to zero, the voltage and output voltage of ground pin GND2 is believed
Number VOUTIt is equal.
It further include control circuit inside integrated circuit 12, control circuit receives feedback signal VFB, and V based on the feedback signalFB
It generates control signal to send to the grid of power switch tube, the turn-on and turn-off for controlling power switch tube switch, and then will be straight
Flow input voltage signal VDCBe converted to output voltage signal VOUT。
In addition, integrated circuit 12 further includes detecting pin DET, which is connected to by clamp capacitor 14 and is patrolled
Collect ground GND1.In another embodiment, detection pin DET is connected to and is patrolled by the clamp capacitor 14 and resistance 15 being connected in series
Collect ground GND1.In the embodiment shown in Figure 2, after the power switch inside integrated circuit 12 turns off, compulsory test pin DET
It is connected with ground pin GND2, so that the voltage on the voltage and ground pin GND2 on detection pin DET is equal.Work as detection pipe
Voltage on foot DET is equal to output voltage signal V when diode D afterflow endsOUTValue when, floating detect pin DET.In Fig. 2
In illustrated embodiment, floating refers to that will test pin DET and ground pin GND2 disconnects, and the voltage on detection pin DET is no longer
Change.It should be noted that be connected due to detecting pin DET with ground pin GND2, in diode D afterflow cut-off, detection
Voltage on pin DET is equal with the voltage on ground pin GND2, however becomes closing since diode D afterflow ends from conducting
In disconnected process, there is a dynamic process, the voltage on ground pin GND2 has ring and shake, when diode D is tied in shutdown
After Shu Bianwei stable state, detects the voltage that the voltage on pin DET is equal on ground pin GND2 and be equal to output voltage VOUT.When negative
When carrying variation, output voltage VOUTIt changes correspondingly, the voltage on ground pin GND2 is relative to the voltage on detection pin DET
Change.When the voltage on ground pin GND2 is lower than one heavily loaded threshold value of the voltage detected on pin DET, integrated circuit is connected
Power switch tube inside 12.Non-isolated AC-DC switch converters 10 enter heavily loaded work from underloading or the fast quick-recovery of idle mode
Operation mode.In the embodiment depicted in figure 2, clamp capacitor 14 and resistance 15 are shown in the outside of integrated circuit 12, in other realities
It applies in example, clamp capacitor 14 and resistance 15 can also be integrated into the inside of integrated circuit 12 according to demand.
In the embodiment depicted in figure 2, integrated circuit 12 further includes power pin BST, and power pin BST passes through bootstrap capacitor
16 are coupled to the ground pin GND2 of integrated circuit 12.Bootstrap capacitor 16 will generate supply voltage on power pin BST, be used for
Power switch inside drive integrated circult 12 and to internal other circuits power supply.
Fig. 3 shows the schematic block diagram inside integrated circuit 12 according to an embodiment of the invention.As shown in figure 3, collection
It include control module 21, afterflow decision circuitry 22, heavily loaded trigger circuit 23, logic circuit 24, power switch tube 26 at circuit 12
And driving circuit.
In the embodiment shown in fig. 3, the feedback pin that control module 21 couples integrated circuit 12 receives feedback signal VFB, and
VFB generates control signal PWM based on the feedback signal.Control signal PWM is a high low logic level signal.In one embodiment
In, when control signal PWM is logically high, power switch 26 is connected；When control signal PWM is logic low, power switch 26 is turned off.
Control module 21 can be used multiple control modes, such as pulse width modulation (such as voltage control, current control, voltage and current
Double -loop control etc.), pulse frequency modulated (control, frequency hopping control etc. is connected in Time constant) or pulse width is modulated or pulse frequency
Modulate the control mode combined.For example, the controlling party of pulse width modulation can be used in the case where normally band carries system
Method；In the case where system underloading or zero load, the control mode of pulse frequency can be used.
Afterflow decision circuitry 22 receives feedback signal VFB, and V based on the feedback signalFBIt generates afterflow and determines signal DTH, work as figure
When diode D afterflow in implementing shown in 2 ends, afterflow determines signal DTHEffectively.Afterflow determines signal DTHIt is patrolled for a height
Collect level signal.In one embodiment, when afterflow determines signal DTHWhen being logically high, afterflow determines signal DTHEffectively.
Heavily loaded trigger circuit 23 has first end, second end third end and output end.The first end of heavily loaded trigger circuit 23
It couples afterflow decision circuit 22 and receives afterflow judgement signal DTH；The second end coupling integrated circuit 12 of heavily loaded trigger circuit 23 connects
Ground pin GND2 receives the voltage signal V in ground pinGND2；The third end coupling integrated circuit 12 of heavily loaded trigger circuit 23
Detect pin DET.Heavily loaded trigger circuit 23 determines signal D according to afterflowTHWith the voltage signal V on ground pin GND2GND2?
It detects and generates a clamp voltage signal V on pin DETDET, wherein clamp voltage signal VDETValue be equal to diode D afterflow
Output voltage signal V when cut-offOUTValue, that is to say the voltage value after diode D is completely switched off on ground pin GND2 (two
Pole pipe D do not have it is completely switched off before, voltage signal on ground pin GND2 has ring and shake).Heavily loaded trigger circuit 23
Also by clamp voltage signal VDETWith the voltage signal V in ground pinGND2Compare the heavily loaded trigger signal C of generationH.Heavy duty triggering letter
Number CHFor a high low logic level signal.In one embodiment, as the voltage signal V on ground pin GND2GND2Value it is low
In clamp voltage signal VDETOne heavy duty threshold value △ V of valueTHHWhen, heavily loaded trigger signal CHEffectively (for example, logically high), power
Switch 26 is connected.Similarly, in the embodiment shown in fig. 3, clamp capacitor 14 and resistance 15 are shown in the outer of integrated circuit 12
Clamp capacitor 14 and resistance 15 can also be integrated into the inside of integrated circuit 12 in other embodiments by portion according to demand,
At this point, clamp capacitor 14 and resistance 15 may include in heavily loaded trigger circuit 23.
Logic circuit 24 has first input end, the second input terminal and output end.The first input end coupling of logic circuit 24
It connects control module 21 and receives control signal PWM；Second input terminal of logic circuit 24 couples heavily loaded trigger circuit 23 and receives heavy duty
Trigger signal CH；Logic circuit 24 will control signal PWM and heavily loaded trigger signal CHLogical operation is done, and generates control signal SW.
Control signal SW is a high low logic level signal, in one embodiment, as control signal PWM and heavily loaded trigger signal CH
When any one is effective (for example, logically high), effectively (for example, logically high), power switch 26 is connected control signal SW.
In the embodiment shown in fig. 3, driving circuit includes driver 25 and bootstrap voltage mode generation circuit.Driver 25 has
First feeder ear, the second feeder ear, input terminal and output end.First feeder ear of driver 25 couples power pin BST；Driving
The ground pin GND2 of the second feeder ear coupling integrated circuit 12 of device 25；The input terminal of driver 25 receives control signal SW；
Driver 25 is based on control signal SW and generates driving signal Dr in output end, wherein driving signal Dr is switched for driving power
26 turn-on and turn-off switching.Bootstrap voltage mode generation circuit includes diode 27, the linear regulator inside integrated circuit 12
Bootstrap capacitor 16 outside (Low Dropout Regulator, LDO) 28 and integrated circuit 12.The input terminal of LDO couples input
Pin IN receives DC input voitage VDC, the anode of the output end coupling diode 27 of LDO, the cathode of diode 27, which couples, powers
Pin BST.Meanwhile the output voltage of LDO is also used as the supply voltage signal V inside integrated circuit 12CC。
The drain D of power switch tube 26 couples input pin IN；The source S of power switch tube 26 couples ground pin
GND2；The output end of the grid G coupling drivers 25 of power switch tube 26 receives driving signal Dr.Pass through power switch tube 26
Turn-on and turn-off switching, high pressure BUCK switching circuit is by DC input voitage VDCBe converted to output voltage signal VOUT。
Fig. 4 shows the circuit diagram inside integrated circuit 12 according to an embodiment of the invention.Implementation shown in Fig. 4
In example, afterflow decision circuitry 22 in embodiment illustrated in fig. 3, heavily loaded trigger circuit 23 and logic circuit 24 are mainly illustrated
Physical circuit schematic diagram.
In the embodiment shown in fig. 4, afterflow decision circuitry 22 includes a voltage comparator 201.Voltage comparator 201
Normal phase input end receives afterflow reference signal VTH, the inverting input terminal reception feedback signal V of voltage comparator 201FB, voltage ratio
Compared with device 201 by feedback signal VFBWith afterflow reference signal VTHCompare, and determines signal D in output end output afterflowTH.Work as feedback
Signal VFBIt is reduced to afterflow reference signal VTHValue when, afterflow determine signal DTHEffectively (such as logically high).In one embodiment
In, afterflow reference signal VTHIncluding a zero voltage signal.I.e. ideally, after diode D is interrupted, feedback signal VFB
Indicate that afterflow determines signal D equal to 0VTHEffectively.
In the embodiment shown in fig. 4, heavily loaded trigger circuit 23 includes pulse trigger 301, clamp switch 302, voltage source
303 and voltage comparator 304.
Pulse trigger 301 receives afterflow and determines signal DTH, and signal D is determined according to afterflowTHGenerate a pulse letter
Number, wherein pulse signal determines signal D in afterflowTHEffectively in a period of time for rising of the initial time of (logically high) effectively, i.e. arteries and veins
It rushes signal and determines signal D relative to afterflowTHIt is a narrow pulse signal, only determines signal D in afterflowTHOne of valid period
In short time period effectively.In one embodiment, the width of pulse signal is that clamp capacitor 14 is charged to output voltage letter
Number VOUTTime span needed for value in diode D afterflow cut-off, the width and detection pin DET of the pulse signal are chosen
The capacitance of clamp capacitor 14, the resistance value of resistance 15 and output voltage signal VOUTIt is related.In general, pulse signal is reasonably wide
Range is spent in tens microseconds between several hundred microseconds.
Clamp switch 302 has first end, second end and control terminal.The first end of clamp switch 302 couples ground pin
GND2 (source electrode that is to say power switch 26), the control terminal return pulse signal of clamp switch 302, when pulse signal is effective
When, clamp switch 302 is switched on.
Voltage comparator 304 has inverting input terminal, normal phase input end and output end.The positive of voltage comparator 304 is defeated
Enter the second end of end coupling clamp switch 302, the inverting input terminal of voltage comparator 304 is coupled to ground connection by voltage source 303
Pin GND2 receives the voltage signal V on ground pin GND2GND2, wherein the voltage value of voltage source 304 is equal to heavily loaded threshold value
△VTHH.Voltage signal V during clamp switch 302 is connected, on ground pin GND2GND2By clamp switch to detection pipe
The clamp capacitor 14 connected on foot DET charges, and generates clamp voltage signal V on detection pin DETDET.When clamp voltage is believed
Number VDETOutput voltage signal V when equal to diode D afterflow cut-offOUTValue when, clamp switch 302 turns off, and detection pin DET is floating
It is empty.In one embodiment, floating refers to that will test pin DET and ground pin GND2 disconnects, and detects the voltage on pin DET
No longer change.Voltage comparator 304 is by the voltage signal V on ground pin GND2GND2With heavily loaded threshold value △ VTHHAnd value and pincers
Position voltage signal VDETCompare, and generates heavily loaded trigger signal C in output endH.It will be understood by those skilled in the art that another
In a embodiment, voltage source 303 can also be coupled in voltage comparator 304 normal phase input end and clamp switch 302
Between two ends, at this point, voltage comparator 304 is by the voltage signal V on ground pin GND2GND2With clamp voltage signal VDETWith
Heavily loaded threshold value △ VTHHDifference comparsion, and generate heavily loaded trigger signal C in output endH.When the voltage letter on ground pin GND2
Number VGND2Value be lower than clamp voltage signal VDETOne heavy duty threshold value △ V of valueTHHWhen, heavily loaded trigger signal CHEffectively (such as patrol
Collect height).Similarly, in the embodiment shown in fig. 4, clamp capacitor 14 and resistance 15 are shown in the outside of integrated circuit 12, pincers
The inverting input terminal that position capacitor 14 and resistance 15 are connected to builtin voltage comparator 304 by detecting pin DET.In other implementations
In example, clamp capacitor 14 and resistance 15 can also be integrated into the inside of integrated circuit 12 according to demand, at this point, clamp capacitor
14 and resistance 15 may include in heavily loaded trigger circuit 23.
Logic circuit 24 includes one or 401, receives control signal PWM and heavily loaded trigger signal CH, and control is believed
Number PWM and heavily loaded trigger signal CHLogical operation is done, the turn-on and turn-off that control signal SW is used to control power switch 26 are generated
Switching.In one embodiment, control signal PWM and heavily loaded trigger signal CHWhen any one is effective (for example, logically high),
Power switch 26 is connected.
Fig. 5 shows the circuit diagram inside integrated circuit 12 according to another embodiment of the present invention.Collection shown in fig. 5
It is the design electricity of heavily loaded trigger circuit 23 at the difference of the schematic diagram of the schematic diagram and integrated circuit 12 shown in Fig. 4 of circuit 12
Road is different.
As shown in figure 5, heavily loaded trigger circuit 23 includes delay circuit 501, rest-set flip-flop 502, clamp switch 503, voltage
Source 504 and voltage comparator 505.
Delay circuit 501 receives afterflow and determines signal DTH, and signal D is determined to afterflowTHDelay generates time delayed signal
DLY.In one embodiment, delay circuit 501 determines signal D to afterflowTHDelay time be clamp capacitor 14 is charged
To output voltage signal VOUTDiode D afterflow cut-off when value time span, the delay time and detection pin DET
The capacitance of the clamp capacitor 14 of selection, the resistance value of resistance 15 and output voltage signal VOUTIt is related.Generally, delay time closes
The width range of reason is in tens microseconds between several hundred microseconds.
Rest-set flip-flop 502, has set end S, reset terminal R and output end Q, and set end S receives control power switch 26 and cuts
The switch control signal SW changed, reset terminal R reception delay signal DLY, rest-set flip-flop is to switch control signal SW and time delayed signal
DLY does logical operation and exports clamp control signals C in output endLAMP.In one embodiment, the set of rest-set flip-flop 502
Hold S in the failing edge moment set clamp control signals C of switch control signal SWLAMP(logically high).That is, when control signal SW from
(power switch 26 is become turning off the moment from conducting) set clamp control signals C when effectively becoming invalidLAMP.Work as time delayed signal
(as feedback signal V when DLY is effectiveFBIt is reduced to afterflow reference signal VTHValue, and be delayed after a period of time), reset clamper
Control signal CLAMP(logic low).
Clamp switch 503 has first end, second end and control terminal.The first end of clamp switch 503 couples ground pin
The control terminal of GND2 (source electrode that is to say power switch 26), clamp switch 503 receive clamp control signals CLAMP, when clamper control
Signal C processedLAMPDuring being set (logically high), clamp switch 503 is switched on.
Voltage comparator 505 has inverting input terminal, normal phase input end and output end.The positive of voltage comparator 505 is defeated
Enter the second end of end coupling clamp switch 503, the inverting input terminal of voltage comparator 505 is coupled to ground connection by voltage source 504
Pin GND2 receives the voltage signal V on ground pin GND2GND2, wherein the voltage value of voltage source 504 is equal to heavily loaded threshold value
△VTHH.Voltage signal V during clamp switch 503 is connected, on ground pin GND2GND2By clamp switch to detection pipe
The clamp capacitor 14 connected on foot DET charges, and generates clamp voltage signal V on detection pin DETDET.When clamp voltage is believed
Number VDETOutput voltage signal V when equal to diode D afterflow cut-offOUTValue when, clamp switch 503 turns off, and detection pin DET is floating
It is empty.In one embodiment, floating refers to that will test pin DET and ground pin GND2 disconnects, and detects the voltage on pin DET
No longer change.Voltage comparator 505 is by the voltage signal V on ground pin GND2GND2With clamp voltage signal VDETCompare, and
Heavily loaded trigger signal C is generated in output endH.As the voltage signal V on ground pin GND2GND2Value be lower than clamp voltage signal
VDETOne heavy duty threshold value △ V of valueTHHWhen, heavily loaded trigger signal CHEffectively (such as logically high).Similarly, reality shown in Fig. 5
It applies in example, clamp capacitor 14 and resistance 15 are shown in the outside of integrated circuit 12, and clamp capacitor 14 and resistance 15 pass through detection
Pin DET is connected to the inverting input terminal of builtin voltage comparator 505.It in other embodiments, can also be according to demand by pincers
Position capacitor 14 and resistance 15 are integrated into the inside of integrated circuit 12, at this point, clamp capacitor 14 and resistance 15 may include in heavy duty
In trigger circuit 23.
Fig. 6 shows the circuit diagram of control module according to an embodiment of the invention.Fig. 6 shows a kind of constant lead
The circuit diagram of the control module 21 of logical time (Constant on Time, COT) control.As shown in fig. 6, control module 21
Including feedback voltage sampling hold circuit 601, voltage comparator 602, constant on-time generation circuit 603 and rest-set flip-flop
604.Feedback voltage sampling hold circuit 601 couples feedback pin FB and receives feedback voltage signal VFB, and to feedback voltage signal
VFBIt samples and keeps and then export the first feedback voltage signal VFB1, wherein the first feedback voltage signal VFB1Represent power switch 26
Feedback voltage signal V during shutdown, diode D afterflow conductingFBValue.The first input end of voltage comparator 602 receives reference
Voltage signal VREF, the first feedback voltage signal V of the second input terminal reception of voltage comparator 501FB1, voltage comparator 602 will
First feedback voltage signal VFB1With reference voltage signal VREFCompare, and exports set signal T in output endON.When constant conduction
Between generation circuit 603 generate a fixed turn-on time reset signal TOFF.The set end S of rest-set flip-flop 604 receives set letter
Number TON, the reset terminal R reception reset signal T of rest-set flip-flop 503OFF, and control signal PWM is exported in output end Q.
Fig. 7 shows the circuit diagram of control module according to another embodiment of the present invention.Fig. 7 shows a kind of voltage
The circuit diagram of the control module 21 of control.As shown in fig. 7, control module includes feedback voltage sampling hold circuit 701, misses
Poor amplifier 702, first voltage comparator 703, second voltage comparator 704 and rest-set flip-flop 705.Feedback voltage sampling is kept
Circuit 701 couples feedback pin FB and receives feedback voltage signal VFB, and to feedback voltage signal VFBIt samples and keeps exporting in turn
First feedback voltage signal VFB1, wherein the first feedback voltage signal VFB1Represent the shutdown of power switch 26, diode D afterflow conducting
Period feedback voltage signal VFBValue.The first input end of error amplifier 702 receives reference voltage signal VREF, error amplification
Second input terminal of device 702 receives the first feedback voltage signal VFB1, error amplifier 702 is by the first feedback voltage signal VFB1With
Reference voltage signal VREFRelatively and by error amplify, in output end output error signal EA.The of first voltage comparator 703
One input terminal receives error signal EA, and the second input terminal of first voltage comparator 703 receives ramp signal RAMP, first voltage
Comparator 703 compares error signal EA and ramp signal RAMP, and exports the first comparison signal CS in output end.Second voltage
The first input end of comparator 704 receives current reference signal VREF_CS, the second input terminal reception of second voltage comparator 704
Current sampling signal VCS, second voltage comparator 704 is by current reference signal VREF_CSWith current sampling signal VCSCompare, and
Output end exports the second comparison signal CR.In one embodiment, current sampling signal VCSRepresent the electricity for flowing through power switch 26
Flow valuve.The set end S of rest-set flip-flop 705 receives the first comparison signal CS, the reset terminal R of rest-set flip-flop 503 receives second and compares
Signal CR, and control signal PWM is exported in output end Q.
Fig. 8 shows a kind of control method for controlling high pressure BUCK switch converters according to an embodiment of the invention.Fig. 8
Shown control method can be used in high pressure BUCK switch converters shown in earlier figures 2-7.It, should as shown in earlier figures 2-7
High pressure BUCK switch converters include power switch 26, diode D, outputting inductance LOUT, feed circuit 13 and clamp capacitor 14,
The input terminal of the drain electrode coupling switch converters of power switch 26 receives DC input voitage VDC, the source electrode coupling two of power switch
The cathode of pole pipe D, the anode of diode D are electrically connected to logically GND1, outputting inductance LOUTIt is coupled in the source electrode of power switch 26
Between the output end OUT of switch converters, feed circuit 13 is connected to the output end OUT and power switch 26 of switch converters
Source electrode between, and diode D conducting during generate one represent output voltage signal VOUTFeedback signal VFB1, clamper
Capacitor 14 by a clamp switch (302 or 503) is coupled in the source electrode of power switch 26 and logically between GND1, the control
Method includes step 81-85.
Step 81, it after power switch 26 turns off, is connected clamp switch (302 or 503), and charges to clamp capacitor.?
In one embodiment, after power switch 26 turns off, signal SW is controlled by power switch, clamp switch (302) are connected at once.
In yet another embodiment, after power switch 26 turns off, clamp switch can be connected again after diode D afterflow cut-off
(503)。
Step 82, when the voltage on clamp capacitor 14 is equal to output voltage signal V when diode D afterflow endsOUTValue
When, it disconnects clamp switch (302 or 503).In one embodiment, when the voltage on clamp capacitor 14 is cut equal to diode continuousing flow
Output voltage signal V when onlyOUTValue when disconnect clamp switch, refer to that the voltage on clamp capacitor 14 is electrically charged and rise to output
Voltage signal VOUTClamp switch can be turned off when value.After clamp switch shutdown, the voltage on clamp capacitor 14 no longer changes,
And output voltage signal VOUTIt can continue to change with the variation of load.It in one embodiment, can be according to the clamp capacitor of selection
Output voltage signal V when 14 capacitance and stable stateOUTVoltage value calculate a clamp capacitor 14 charging time.
Step 83, compare the voltage on 26 source electrode of voltage and power switch on clamp capacitor 14, judge power switch source
Whether the difference of the voltage of voltage and clamp capacitor on extremely is greater than heavily loaded threshold value.In one embodiment, when diode D afterflow
After cut-off shutdown, inductive current LOUTOn the electric current that flows through be zero, the voltage on 26 source electrode of power switch is equal to output after stable state
Hold the output voltage signal V on OUTOUTValue.
Step 84, when the difference of the voltage on the voltage and clamp capacitor on power switch source electrode is greater than heavily loaded threshold value,
Conducting power switch.
It is exemplary only to the description of control method according to an embodiment of the present invention and step above, it is not used to this
Invention is defined.In addition, some well known rate-determining steps and control parameter used etc. do not provide or and be not described in detail,
So that the present invention understands, simplicity and is easy to understand.Technical field that the present invention belongs to it is to be understood by the skilled artisans that it is above to according to this
It invents the step of using described in the description of the control method and step of each embodiment number and is not intended to represent the exhausted of each step
To sequencing, these steps are not realized according to number of steps sequence, and may be adopted and be realized in differing order, it is also possible to same
When realize side by side, be not limited only to described embodiment.
Although exemplary embodiment describes the present invention with reference to several, it is to be understood that, term used is explanation and shows
Example property, term and not restrictive.The spirit or reality that can be embodied in a variety of forms due to the present invention without departing from invention
Matter, it should therefore be appreciated that above-described embodiment is not limited to any of the foregoing details, and the spirit defined by appended claims
It all should be accompanying power with the whole change and modification widely explained, therefore fallen into claim or its equivalent scope in range
Benefit requires to be covered.
Claims (13)
1. a kind of voltage converter ic for high pressure BUCK switch converters has input pin and ground pin,
In, high pressure BUCK switch converters include diode, outputting inductance and feed circuit, and the cathode of diode couples ground pipe
Foot, the anode of diode are electrically connected to switch converters logically；Outputting inductance couples ground pin and switch converters
Between output end；Feed circuit is connected between the output end of switch converters and ground pin, and during diode current flow
The feedback signal for representing output voltage signal is generated, the voltage converter ic further comprises:
Feedback pin is coupled to feed circuit, receives feedback signal；
Pin is detected, switch converters are electrically connected to logically by clamp capacitor；
Power switch has first end, second end and control terminal, and first end couples input pin and receives input voltage, the
Two ends couple ground pin；
Afterflow decision circuit, coupling feedback pin receive feedback signal, and generate afterflow based on the feedback signal and determine signal, when two
After pole pipe afterflow cut-off, afterflow determines that signal is effective；And
Heavily loaded trigger circuit, coupling detection pin, ground pin and afterflow decision circuit, after power switch shutdown, heavy duty touching
Power Generation Road connecting detection pin and ground pin, and detection pin generate a clamp voltage signal after disconnection detection pin and
The connection of ground pin, wherein the value of clamp voltage signal is equal to the value of output voltage signal when diode continuousing flow ends, continuous
Stream determines the signal valid period, and the voltage signal in clamp voltage signal and ground pin is compared generation weight by heavily loaded trigger circuit
Trigger signal is carried, when value one heavily loaded threshold value of the value of voltage signal in ground pin lower than clamp voltage signal, heavy duty touching
It signals effectively, power switch conducting.
2. voltage converter ic as described in claim 1, wherein it is described heavy duty trigger circuit include:
Pulse trigger receives afterflow and determines signal, and determines that signal generates pulse signal according to afterflow, wherein pulse signal
Within a period of time that afterflow determines the effective initial time of signal effectively；
Clamp switch, has first end, second end and control terminal, and the first end of clamp switch couples ground pin, clamp switch
Second end coupling detection pin, the control terminal return pulse signal of clamp switch, when pulse signal is effective, clamp switch is led
It is logical；And
Voltage comparator, has first input end, the second input terminal and output end, and the first input end of voltage comparator couples inspection
Test tube foot receives clamp voltage signal, and the second input terminal of voltage comparator is connect by a voltage source ground pin
Voltage signal on ground pin, voltage comparator by ground pin voltage signal and voltage source and value with clamp voltage believe
Number compare, and export heavily loaded threshold signal in the output end of voltage comparator, wherein the voltage value of voltage source is equal to heavily loaded threshold
Value.
3. voltage converter ic as described in claim 1, wherein it is described heavy duty trigger circuit include:
Delay circuit receives afterflow and determines signal, and determines signal delay to afterflow, generates time delayed signal；
Rest-set flip-flop, has set end, reset terminal and output end, and set end receives the switch control letter of control power switch switching
Number, reset terminal reception delay signal, rest-set flip-flop to switch control signal and time delayed signal do logical operation and in output end it is defeated
Clamp control signals out；
Clamp switch, has first end, second end and control terminal, and the first end of clamp switch couples ground pin, clamp switch
Second end coupling detection pin, the control terminal of clamp switch receives clamp control signals；And
Voltage comparator, has first input end, the second input terminal and output end, and the first input end of voltage comparator couples inspection
Test tube foot receives clamp voltage signal, and the second input terminal of voltage comparator is connect by a voltage source ground pin
Voltage signal on ground pin, voltage comparator by ground pin voltage signal and voltage source and value with clamp voltage believe
Number compare, and export heavily loaded threshold signal in the output end of voltage comparator, wherein the voltage value of voltage source is equal to heavily loaded threshold
Value.
4. voltage converter ic as described in claim 1, wherein the afterflow decision circuit includes afterflow comparator,
The afterflow comparator has the first input end for receiving feedback signal, the second input terminal for receiving afterflow threshold signal and output
End, afterflow comparator compare feedback signal and afterflow threshold signal, and generate afterflow in the output end of afterflow comparator and determine
Signal, when feedback signal is less than afterflow threshold signal, afterflow determines that signal is effective.
5. voltage converter ic as described in claim 1, further comprises:
Control module receives feedback signal, and generates first control signal based on the feedback signal；And
Logic circuit receives first control signal and heavily loaded trigger signal, and does to first control signal and heavily loaded trigger signal
Logical operation generates switch control signal, wherein when first control signal and heavily loaded trigger signal, any one is effective, opens
Close control signal control power switch conducting.
6. voltage converter ic as described in claim 1, further comprises power pin, wherein power pin passes through certainly
It lifts capacitor and is coupled to ground pin.
7. a kind of high pressure BUCK switch converters, comprising:
Power switch, has first end, second end and control terminal, and the first end of power switch receives input voltage signal, power
The second end of switch is coupled to the output end of switch converters by outputting inductance；
Freewheeling diode, the second end of the cathode coupling power switch of freewheeling diode, the anode of freewheeling diode are electrically connected to
Logically；
Feed circuit is connected to the second end of power switch and the output end of switch converters, and produces during diode current flow
Raw one represents the feedback signal of output voltage signal；
Afterflow decision circuit receives feedback signal, and generates afterflow based on the feedback signal and determine signal, when diode continuousing flow ends
Afterwards, afterflow determines that signal is effective；And
Heavily loaded trigger circuit couples power switch second end and afterflow decision circuit, determines signal valid period, heavy duty in afterflow
Trigger circuit generates a clamp voltage signal, wherein the value of clamp voltage signal is equal to output electricity when diode continuousing flow ends
The value of signal is pressed, the voltage signal on clamp voltage signal and power switch second end is compared generation heavy duty by heavily loaded trigger circuit
Trigger signal, when value one heavily loaded threshold value of the value of voltage signal in power switch second end lower than clamp voltage signal, weight
It is effective to carry trigger signal, power switch conducting.
8. high pressure BUCK switch converters as claimed in claim 7, wherein it is described heavy duty trigger circuit include:
Pulse trigger receives afterflow and determines signal, and determines that signal generates pulse signal according to afterflow, wherein pulse signal
Within a period of time that afterflow determines the effective initial time of signal effectively；
Clamp switch, has first end, second end and control terminal, and the first end of clamp switch couples power switch second end, pincers
The control terminal return pulse signal of bit switch, when pulse signal is effective, clamp switch conducting；
Clamp capacitor, be connected to clamp switch second end and logically between, wherein voltage signal on clamp capacitor is pincers
Position voltage signal；And
Voltage comparator, has first input end, the second input terminal and output end, and the first input end of voltage comparator couples pincers
The second end of bit switch receives clamp voltage signal, and the second input terminal of voltage comparator passes through a voltage source to power
The second end of switch receives the voltage signal in power switch second end, and voltage comparator is by the voltage in power switch second end
Signal and voltage source and value export heavily loaded threshold signal compared with clamp voltage signal, and in the output end of voltage comparator,
Wherein, the voltage value of voltage source is equal to heavily loaded threshold value.
9. high pressure BUCK switch converters as claimed in claim 7, wherein it is described heavy duty trigger circuit include:
Delay circuit receives afterflow and determines signal, and determines signal delay to afterflow, generates time delayed signal；
Rest-set flip-flop, has set end, reset terminal and output end, and set end receives the switch control letter of control power switch switching
Number, reset terminal reception delay signal, rest-set flip-flop to switch control signal and time delayed signal do logical operation and in output end it is defeated
Clamp control signals out；
Clamp switch, has first end, second end and control terminal, and the first end of clamp switch couples power switch second end, pincers
The control terminal of bit switch receives clamp control signals；
Clamp capacitor, be connected to clamp switch second end and logically between, wherein voltage signal on clamp capacitor is pincers
Position voltage signal；And
Voltage comparator, has first input end, the second input terminal and output end, and the first input end of voltage comparator couples pincers
The second end of bit switch receives clamp voltage signal, and the second input terminal of voltage comparator passes through a voltage source to power
The second end of switch receives the voltage signal in power switch second end, and voltage comparator is by the voltage in power switch second end
Signal and voltage source and value export heavily loaded threshold signal compared with clamp voltage signal, and in the output end of voltage comparator,
Wherein, the voltage value of voltage source is equal to heavily loaded threshold value.
10. high pressure BUCK switch converters as claimed in claim 7, further comprise:
Control module receives feedback signal, and generates first control signal based on the feedback signal；And
Logic circuit receives first control signal and heavily loaded trigger signal, and does to first control signal and heavily loaded trigger signal
Logical operation generates switch control signal, wherein when first control signal and heavily loaded trigger signal, any one is effective, opens
Close control signal control power switch conducting.
11. high pressure BUCK switch converters as claimed in claim 7, wherein the afterflow decision circuit includes that afterflow is compared
Device, which has the first input end for receiving feedback signal, receives the second input terminal of afterflow threshold signal and defeated
Outlet, afterflow comparator compare feedback signal and afterflow threshold signal, and generate afterflow in the output end of afterflow comparator and sentence
Determine signal, when feedback signal is less than afterflow threshold signal, afterflow determines that signal is effective.
12. it is a kind of control high pressure BUCK switch converters control method, high pressure BUCK switch converters include power switch,
Diode, outputting inductance, feed circuit and clamp capacitor, the input terminal of the drain electrode coupling switch converters of power switch receive defeated
Enter voltage signal, the cathode of the source electrode coupling diode of power switch, the anode of diode is electrically connected to logically, outputting inductance
It is coupled between the source electrode of power switch and the output end of switch converters, feed circuit is connected to the output end of switch converters
Between the source electrode of power switch, clamp capacitor by a clamp switch be coupled in power switch source electrode and logically it
Between, the control method includes:
After power switch shutdown, clamp switch is connected, and charge to clamp capacitor；
When the voltage value on clamp capacitor is equal to the value of output voltage signal when diode continuousing flow ends, clamp switch is disconnected；
Compare the voltage on the voltage and power switch source electrode on clamp capacitor；And
When the voltage value on power switch source electrode is lower than one heavily loaded threshold value of voltage value on clamp capacitor, conducting power is opened
It closes.
13. control method as claimed in claim 12, wherein after power switch turns off, conducting clamp switch includes step
After power switch shutdown and after diode continuousing flow cut-off, clamp switch is connected.
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