CN110504832A - Control circuit and method for high pressure BUCK switch converters - Google Patents
Control circuit and method for high pressure BUCK switch converters Download PDFInfo
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- CN110504832A CN110504832A CN201910886049.4A CN201910886049A CN110504832A CN 110504832 A CN110504832 A CN 110504832A CN 201910886049 A CN201910886049 A CN 201910886049A CN 110504832 A CN110504832 A CN 110504832A
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
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Abstract
Disclose a kind of control circuit in high pressure BUCK switch converters.The switch converters include power tube, diode and integrated circuit.The ground pin of the source electrode of power switch and the cathode common end of diode as integrated circuit.The control circuit includes a feed circuit, for detecting the voltage difference between IC ground pin and the reference ground of switch converters after diode continuousing flow cut-off, and be passed to integrated circuit for determine load situation of change.The control circuit can be used for 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 control circuit and control for high pressure BUCK switch converters
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.High pressure step-down switching converter is because its circuit is simple, peripheral circuit element is few, loss is small and the low spy of fever
Point 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 high pressure BUCK switch converters.High pressure BUCK
Switch converters include rectification circuit, input filter capacitor CINWith high pressure BUCK switching circuit.Wherein, high pressure BUCK switching circuit
Including integrated circuit 501, diode D, outputting inductance LOUT, output capacitance COUTWith feed circuit 502.
In general, integrated circuit 501 includes input pin IN, feedback pin FB and ground pin GND2.In integrated circuit 501
Portion includes a power switch tube, and the drain electrode of the power switch tube couples input pin IN, the source electrode coupling of the power switch tube
501 ground pin GND2 of integrated circuit, and it is electrically connected to by diode D the logically GND1 of high pressure BUCK switch converters.
Feedback pin FB receives the output voltage signal V for representing output end OUTOUTFeedback signal, and control based on the feedback signal
The turn-on and turn-off of power switch tube, and then by input capacitance CINThe DC input voitage V at both endsDCBe converted to output voltage letter
Number VOUT。
In high pressure BUCK switch converters shown in fig. 1, due to the ground pin GND2 and AC-DC of integrated circuit 501
The logically GND1 of switch converters is two different current potentials, therefore, it is difficult to directly in real time acquisition output voltage signal VOUTIt send
It is controlled to adjust to integrated circuit 501.In general, we are coupled in output end OUT and integrated electricity using a feed circuit 502
Between 501 ground pin GND2 of road.When the main switch shutdown in integrated circuit 501, when diode D afterflow is connected, electricity is integrated
The ground pin GND2 on road 501 is electrically connected with logically GND1, at this point, having one between ground pin GND2 and logically GND1
A fixed voltage is poor (conduction voltage drop of diode D), and therefore, the feedback signal that feed circuit 502 generates can represent output voltage
Signal VOUT。
But when high pressure BUCK switching converter operation is in underloading or zero load, the voltage of feedback pin FB is zero, ground connection
The voltage and output voltage signal V of pin GND2OUTValue it is equal, output voltage signal VOUTBy output capacitance COUTElectric discharge 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 system from
Underloading or zero load revert to when overloaded, since received feedback signal was the upper period diode D conducting phase on feedback pin FB
Between acquire, cannot reaction load in time variation, simultaneously as working frequency is very low, next switching cycle will not arrive at once
Come, therefore causes system's transient response speed slow.Output capacitance COUTIt is not enough to maintain the demand of load, output voltage signal
VOUTValue power down it is serious, system cisco unity malfunction.Therefore, for high pressure BUCK switch converters system, it will usually connect one
A fictitious load guarantees that whole system will not work under low-down frequency condition, and still, fictitious load will increase power consumption again, lead
Cause ineffective systems.
Therefore, it is desirable to propose the high pressure BUCK 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, propose a kind of high pressure BUCK switch change-over control circuit and
Control method.
One aspect of the present invention provides a kind of high pressure BUCK switch converters, comprising: diode；Power switch has the
One end, second end and control terminal, the first end of power switch receive input voltage, the second end coupling diode of power switch
Cathode, the control terminal of power switch receive control signal, wherein the anode of diode is electrically connected to first with reference to ground, and power is opened
The common end of second end and diode cathode is closed as the second reference ground；Inductance, be coupled in second with reference to and switch converters
Output end between；First feed circuit, with being coupled in the second reference between the output end of switch converters, and in diode
First feedback signal for representing output voltage signal is generated during conducting；Second feed circuit is connected to first with reference to ground
And second with reference between ground, detection first with reference to ground second with reference to the voltage difference between ground, and in power switch and diode
The voltage difference between ground is referred to second second feedback signal with representing the first reference is generated after being turned off；And control
Circuit receives the first feedback signal and the second feedback signal, and generates control according to the first feedback signal and the second feedback signal
The turn-on and turn-off of signal control power switch, wherein control circuit is integrated in an integrated circuit, and second is with reference to ground
The reference ground of integrated circuit.
Another aspect of the invention provides a kind of for controlling the integrated circuit of high pressure BUCK switch converters, the switch
Converter includes diode, inductance, the first feed circuit and the second feed circuit, wherein diode cathode passes through inductance coupling
The output end of switch converters, with reference to ground, diode cathode is anti-with reference to ground, first as second for diode anode electrical connection first
Current feed circuit between the output end of switch converters, generates first feedback for representing output voltage with being coupled in the second reference
Signal, the second feed circuit is with being connected to the second reference first with reference between ground, and detection first is with reference to ground with second with reference to ground
Between voltage difference, generate one represent first with reference to second with reference to the voltage difference between ground the second feedback signal, institute
Stating integrated circuit includes: input pin, receives input voltage signal；First feedback pin receives the first feedback signal；Second is anti-
Pin is presented, the second feedback signal is received；Ground pin, coupling second is with reference to ground；Power switch, have first end, second end and
The first end coupling input pin of control terminal, power switch receives input voltage, and the second end of power switch couples ground pin,
Control terminal receives control signal；And control circuit, the first feedback signal and the second feedback signal are received, and according to the first feedback
Signal and the second feedback signal generate the turn-on and turn-off of control signal control power switch.
Another aspect of the present invention provides a kind of control method for controlling high pressure BUCK switch converters, wherein the high pressure
BUCK switch converters include power switch, diode and the integrated circuit for controlling high pressure BUCK switch converters, function
The input terminal of the drain electrode coupling switch converters of rate switch receives input voltage signal, the source electrode coupling diode of power switch
Cathode, the anode of diode are electrically connected to first with reference to ground, the common end conduct of the cathode of the source electrode and diode of power switch
Second with reference to ground, wherein second with reference to the reference ground that ground is the integrated circuit, and the control method includes: to judge that power is opened
It closes and whether freewheeling diode is turned off；After power switch and freewheeling diode are turned off, detection first is with reference to ground and second
With reference to the voltage difference between ground, the second feedback signal of with representing the first reference voltage difference between the second reference ground is generated, and
Second feedback signal is sent to integrated circuit；Judge whether the second feedback signal is lower than brownout threshold, when the second feedback signal is low
When brownout threshold, conducting power switch；And judge whether the second feedback signal is higher than overvoltage threshold, when the second feedback signal
When higher than overvoltage threshold, power switch off state is kept, wherein overvoltage threshold is greater than brownout threshold.
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 high pressure BUCK switch converters；
Fig. 2 shows the schematic block diagrams of high pressure BUCK switch converters 100 according to an embodiment of the invention；
Fig. 3 show it is according to an embodiment of the invention include an integrated circuit 30 high pressure BUCK switch converters 200
Schematic block diagram；
Fig. 4 show it is according to an embodiment of the invention include an integrated circuit 40 high pressure BUCK switch converters 300
Schematic block diagram；
Fig. 5 show it is according to an embodiment of the invention include an integrated circuit 50 high pressure BUCK switch converters 400
Schematic block diagram；
Fig. 6 show it is according to an embodiment of the invention include an integrated circuit 60 high pressure BUCK switch converters 500
Schematic block diagram；
Fig. 7 shows the circuit diagram of enabled circuit 15 according to an embodiment of the invention；
Fig. 8 shows the circuit diagram of the enabled circuit 15 of another embodiment according to the present invention；
Fig. 9 shows the circuit diagram of comparison circuit 16 according to an embodiment of the present invention；
Figure 10 shows the circuit diagram of control unit 17 according to an embodiment of the invention；
Figure 11 shows the circuit diagram of control unit 17 according to another embodiment of the present invention；
Figure 12 shows a kind of control method 600 for controlling high pressure BUCK switch converters according to an embodiment of the invention
Schematic diagram.
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 high pressure BUCK switch converters 100 according to an embodiment of the invention.Such as Fig. 2
Shown, high pressure BUCK switch converters 100 include rectification circuit 10, input filter capacitor CINWith high pressure BUCK switching circuit.It is whole
Current circuit 10 receives ac voltage signal VAC, ac voltage signal VACPass through the rectification of rectification circuit 10 and input capacitance CIN filter
D.c. input voltage signal V is obtained after waveIN.High pressure BUCK switching circuit includes power switch 11, diode 12, inductance LOUT, it is defeated
Capacitor C outOUT, the first feed circuit 13, the second feed circuit 14 and control circuit 20.
Power switch 11 has first end, second end and control terminal, and first end couples the output termination of rectification circuit 10
Receive input voltage VIN, the second end of power switch 11 is electrically connected to first with reference to ground GND1 by diode 12.Wherein, diode
12 anode is electrically connected to first with reference to ground GND1；The cathode of diode 12 is electrically connected to the second end of power switch 11, and two
The common end of the second end of the cathode and power switch 11 of pole pipe 12 is labeled as second with reference to ground GND2.In one embodiment,
Two with reference to the reference ground that ground GND2 is an integrated circuit.Inductance LOUTSecond is coupled in reference to ground GND2 and switch converters 100
Output end OUT between.Output capacitance COUTOutput end OUT and first is coupled in reference between ground GND1.
First feed circuit 13 is coupled between the reference of output end OUT and second ground GND2, and the phase is connected in diode 12
Between generate represent output voltage signal VOUTFeedback signal VFB1.In one embodiment, the first feed circuit 13 includes series connection
Be connected to output end OUT and second with reference to ground GND2 between first resistor R1 and second resistance R2, wherein first resistor R1 and
The common end coupling of second resistance R2 is provided as the output end of the first feed circuit 13
First feedback signal VFB1.During diode 12 is connected, the first feedback signal VFB1With output voltage signal VOUTAt
Proportional relationship；When 12 afterflow of diode cut-off, inductance L is flowed throughOUTElectric current be zero, the first feedback signal VFB1Equal to zero.
Second feed circuit 14 is connected to first with reference to ground GND1 and second with reference between ground GND2, detects the first reference
Ground GND1 and second is with reference to the voltage difference between ground GND2.And a generation is generated after power switch 11 and diode 12 are turned off
Table first is with reference to ground GND1 and second with reference to the second feedback signal V of the voltage difference between ground GND2FB2.When 12 afterflow of diode
When cut-off, inductance L is flowed throughOUTElectric current be zero, second with reference to ground GND2 voltage and output voltage signal VOUTIt is equal.Therefore the
Two feedback signal VFB2Directly reflect when 12 afterflow of diode by after output voltage VOUTInformation.In one embodiment,
Second feedback signal VFB2Including a voltage signal；In another embodiment, the second feedback signal VFB2Including an electric current
Signal.
Control circuit 20 receives the first feedback signal VFB1With the second feedback signal VFB2, and according to the first feedback signal VFB1
With the second feedback signal VFB2It generates control signal PWM and send control signal PWM to the control terminal of power switch 11, for controlling
The turn-on and turn-off of power switch 11 processed switch, and then by d.c. input voltage signal VINBe converted to output voltage signal VOUT.In
In one embodiment, control circuit 20 includes enabled circuit 15, comparison circuit 16 and control unit 17.
In the embodiment depicted in figure 2, it enables circuit 15 and generates enable signal EN, when power switch 11 and diode 12 close
It has no progeny, enable signal EN is effective.In one embodiment, circuit 15 is enabled according to the first feedback signal VFB1Generate enable signal
EN.In another embodiment, enable signal EN can be generated according to control signal PWM by enabling circuit 15.
Comparison circuit 16 receives enable signal EN and the second feedback signal VFB2, when enable signal EN is effective, comparison circuit
16 by the second feedback signal VFB2Respectively with brownout threshold compared with overvoltage threshold, second control signal PWM2 is generated；Wherein, when
Second feedback signal VFB2When less than brownout threshold, second control signal PWM2 is used for conducting power switch 11；When the second feedback letter
Number VFB2When greater than overvoltage threshold, second control signal PWM2 is for keeping power switch 11 to continue to turn off.In one embodiment
In, overvoltage threshold is greater than brownout threshold, as the second feedback signal VFB2When less than brownout threshold, represents load and enter heavy duty, power
Switch 11 is switched at once.In one embodiment, second control signal PWM2 includes two signals.
Control unit 17 receives the first feedback signal VFB1With second control signal PWM2, and according to the first feedback signal VFB1
Control signal PWM is generated with second control signal PWM2, is used for turn-on and turn-off power switch 11.
In the embodiment depicted in figure 2, which is illustrated as N-type metal oxide semiconductor field effect tube
(Metal Oxide Semiconductor Field Effect Transistor, MOSFET), in other embodiments, function
Rate switch 11 can also include the switching device of other suitable types, such as p-type MOSFET, technotron (Junction
Field Effect Transistor, JFET), insulated gate bipolar transistor (Insulated Gate Bipolar
Transistor, IGBT) etc. suitable power device.
Fig. 3 show it is according to an embodiment of the invention include an integrated circuit 30 high pressure BUCK switch converters 200
Schematic block diagram.The structure of high pressure BUCK switch converters 200 and high pressure BUCK switch converters 100 is essentially identical, only
In the embodiment shown in fig. 3, one is integrated in by enabling the control circuit that circuit 15, comparison circuit 16 and control unit 17 form
In a integrated circuit 30.As shown, integrated circuit 30 includes the first feedback pin FB1, the second feedback pin FB2, ground pipe
Foot GND2 and driving pin DRV.First feedback pin FB1 couples the first feed circuit 13 and receives the first feedback signal VFB1.Second
Feedback pin FB2 couples the second feed circuit 14 and receives the second feedback signal VFB2.The second reference of ground pin GND2 coupling ground,
It that is to say the common end of the second end of power switch 11 and the cathode of diode 12.Drive pin DRV coupling power switch 11
Control terminal provides control signal PWM.
In the embodiment shown in fig. 3, the second feed circuit 14 is illustrated as two and is connected in series in first with reference to ground GND1
And second with reference to ground GND2 between resistance R3 and R4.Wherein, the common end between resistance R3 and resistance R4 is as the second feedback
The output end of circuit 14 provides the second feedback signal VFB2.After power switch 11 and diode 12 are turned off, second with reference to ground
Voltage on GND2 is equal to output voltage VOUT.At this point, second is used as the ground pin of integrated circuit 30 with reference to ground GND2 again, because
This, the voltage on the first reference ground GND1 is a negative output voltage V for integrated circuit 30OUTValue.Therefore,
After power switch 11 and diode 12 are turned off, the second feedback signal VFB2First is represented with reference to ground GND1 and second with reference to ground
Voltage difference between GND2 that is to say and represent output voltage VOUT.In the embodiment shown in fig. 3, the second feedback signal VFB2Including
One negative voltage signal, value are equal to-VOUT×R4/(R3+R4).Since the pin of integrated circuit 30 wants the input of negative voltage
It asks, in general, the value of resistance R4 is much larger than the value of resistance R3.For example, the value of resistance R3 can be 20k ohm, the value of resistance R4 can be
20M ohm.
Fig. 4 show it is according to an embodiment of the invention include an integrated circuit 40 high pressure BUCK switch converters 300
Schematic block diagram.In some embodiments, power switch 11 and control circuit can be integrated together in integrated circuits.Such as
Shown in Fig. 4, compared with high pressure BUCK switch converters 200, the integrated circuit 40 in high pressure BUCK switch converters 300 is also integrated
Power switch 11.In the embodiment shown in fig. 4, integrated circuit 40 includes input pin IN, the first feedback pin FB1, second
Feedback pin FB2 and ground pin GND2.Input pin IN receives input voltage signal VIN, the first feedback pin FB1 coupling the
One feed circuit 13 receives the first feedback signal VFB1.Second feedback pin FB2 couples the second feed circuit 14 and receives the second feedback
Signal VFB2.Ground pin GND2 coupling second that is to say the cathode of diode 12 with reference to ground GND2.Inside integrated circuit 40,
The drain electrode of power switch 11 receives input voltage signal V by input pin ININ, the source electrode coupling ground pin of power switch 11
GND2。
Fig. 5 show it is according to an embodiment of the invention include an integrated circuit 50 high pressure BUCK switch converters 400
Schematic block diagram.The structure of high pressure BUCK switch converters 400 and high pressure BUCK switch converters 200 shown in Fig. 3 is basic
It is identical, an integrated circuit 50 is integrated in by enabling the control circuit that circuit 15, comparison circuit 16 and control unit 17 form
In.Integrated circuit 50 includes the first feedback pin FB1, the second feedback pin FB2, ground pin GND2 and driving pin DRV.The
One feedback pin FB1 couples the first feed circuit 13 and receives the first feedback signal VFB1.Second feedback pin FB2 coupling second is anti-
Current feed circuit 14 receives the second feedback signal VFB2.Ground pin GND2 coupling second that is to say the second of power switch 11 with reference to ground
The common end of the cathode of end and diode 12.The control terminal of pin DRV coupling power switch 11 is driven to provide control signal PWM.
It is differently with high pressure BUCK switch converters 200 shown in Fig. 3, in high pressure BUCK switch converters 400, the
A part of two feed circuits 14 is integrated in integrated circuit 50.Specifically, in the embodiment shown in fig. 5, the second feedback electricity
Road 14 includes sampling resistor Rs, operational amplifier 51, transistor 52 and current mirror 53.Sampling resistor Rs is located at integrated circuit 50
Outside, operational amplifier 51, transistor 52 and current mirror 53 are integrated in integrated circuit 50.
Sampling resistor Rs is connected to first with reference between ground GND1 and the second feedback pin FB2.Operational amplifier 51 has
First input end, the second input terminal and output end.The first input end of operational amplifier 51 couples ground pin GND2；Operation is put
Second feedback pin FB2 of big device 51；The grid of 51 output end coupling transistors 52 of operational amplifier.The drain electrode coupling of transistor 52
Connect the first current terminal of current mirror 53；The source electrode of transistor 52 couples the second feedback pin FB2.When power switch 11 and diode
After 12 are turned off, second is equal to output voltage V with reference to the voltage on ground GND2OUT.At this point, second is used as collection with reference to ground GND2 again
At the ground pin of circuit 60, accordingly, with respect to ground pin GND2, first with reference to the voltage on ground GND1 is one negative defeated
Voltage V outOUTValue.Therefore the voltage on the second feedback pin FB2 is equal on ground pin GND2 by 51 clamper of operational amplifier
Ground potential, the first current terminal of current mirror 53 exports a current signal, and value is equal to VOUT/Rs.Meanwhile 53 mirror of current mirror
Fed-back current signals I is exported as the electric current, and in the second current output terminalFB2, value is equal to VOUT/Rs.In other words, in Fig. 6
In illustrated embodiment, the second feedback signal VFB2Including a current signal IFB2, value is equal to VOUT/Rs。
Those of ordinary skill in the art are appreciated that in embodiment illustrated in fig. 5 that power switch 11 can also be integrated in
In integrated circuit 50.The connection type of pin is refering to what is shown in Fig. 4, in order not to obscure focus of the invention, here no longer after integrated
It is tired to state.
Fig. 6 show it is according to an embodiment of the invention include an integrated circuit 60 high pressure BUCK switch converters 500
Schematic block diagram.The structure of high pressure BUCK switch converters 500 and high pressure BUCK switch converters 200 shown in Fig. 3 is basic
It is identical, an integrated circuit 60 is integrated in by enabling the control circuit that circuit 15, comparison circuit 16 and control unit 17 form
In.Integrated circuit 60 includes the first feedback pin FB1, the second feedback pin FB2, ground pin GND2, conversion pin VT and drive
Dynamic pin DRV.First feedback pin FB1 couples the first feed circuit 13 and receives the first feedback signal VFB1.Second feedback pin
FB2 couples the second feed circuit 14 and receives the second feedback signal VFB2.Ground pin GND2 coupling second that is to say function with reference to ground
The common end of the cathode of the second end and diode 12 of rate switch.The control terminal of pin DRV coupling power switch 11 is driven to provide
Control signal PWM.Conversion pin VT will be continued to describe as a part of the second feed circuit 14 in lower section.
Similar with high pressure BUCK switch converters 400 shown in fig. 5, in high pressure BUCK switch converters 500, second is anti-
A part of current feed circuit 14 is integrated in integrated circuit 60.Specifically, in the embodiment shown in fig. 6, the second feed circuit 14
Including resistance R5, resistance R6, operational amplifier 61 and transistor 62.Resistance R5 and resistance R6 is located at the outside of integrated circuit 60,
Operational amplifier 61 and transistor 62 are integrated in integrated circuit 60.
Resistance R5 and resistance R6 is connected in series between the first reference ground GND1 and the second feedback pin FB2, and resistance R5
Common end coupling conversion pin VT between resistance R6.Operational amplifier 61 has first input end, the second input terminal and defeated
Outlet.The first input end of operational amplifier 61 couples ground pin GND2；The second input terminal coupling of operational amplifier 61 turns
Change pin VT；The grid of 61 output end coupling transistors 62 of operational amplifier.The drain electrode of transistor 62 couples power supply VCC；
The source electrode of transistor 62 couples the second feedback pin FB2.After power switch 11 and diode 12 are turned off, second with reference to ground
Voltage on GND2 is equal to output voltage VOUT.At this point, second is used as the ground pin of integrated circuit 60, fortune with reference to ground GND2 again
The voltage clamping on pin VT will be converted equal to the voltage on ground pin GND2 by calculating amplifier 61.Accordingly, with respect to crossover connection
Ground potential on foot VT, the first voltage referred on ground GND1 is a negative output voltage VOUTValue.Therefore the second feedback pipe
Voltage on foot FB2 is a positive voltage, and value is equal to VOUT×R6/R5.In other words, in the embodiment shown in fig. 6, second
Feedback signal VFB2Including a positive voltage signal, value is equal to VOUT×R6/R5。
Similarly, those of ordinary skill in the art are appreciated that in embodiment illustrated in fig. 6, and power switch 11 can also be with
It is integrated in integrated circuit 60.The connection type of pin is refering to what is shown in Fig. 4, in order not to obscure focus of the invention after integrated,
It is described again here.
Fig. 7, Fig. 8 respectively illustrate the circuit diagram of enabled circuit 15 according to an embodiment of the present invention.Enabled circuit 15
For generate enable signal EN for when power switch 11 and diode 12 be turned off after, enabled comparison circuit 16.
In the embodiment shown in fig. 7, enabling circuit 15 includes failing edge trigger circuit 151 and delay circuit 152.Failing edge
Trigger circuit 151 receives control signal PWM, and generates trigger signal Tr at the failing edge moment of control signal PWM.Delay circuit
152 receive trigger signal Tr, and enable signal EN is generated after certain time-delay.Delay circuit 152 prolongs trigger signal Tr
When the time can be according to concrete application circuit design.In one embodiment, in the delay time section of trigger signal Tr, it is believed that two
Pole pipe 12 has been switched off.
In the embodiment shown in fig. 8, enable circuit 15 include voltage comparator have normal phase input end, inverting input terminal and
Output end.The normal phase input end of voltage comparator receives zero passage threshold signal VZCD, the inverting input terminal of voltage comparator receives the
One feedback signal VFB1, voltage comparator is by the first feedback signal VFB1With zero passage threshold signal VZCDCompare, and in voltage comparator
Output end export enable signal EN.In one embodiment, zero passage threshold signal VZCDEqual to the value of zero or near zero.
Fig. 9 shows the circuit diagram of comparison circuit 16 according to an embodiment of the present invention.As shown, comparison circuit 16
Including first comparator 161 and the second comparator 162.First comparator 161 and the second comparator 162 be respectively provided with enable end,
Inverting input terminal, normal phase input end and output end.
The enable end of first comparator 161 receives enable signal EN, and the inverting input terminal of first comparator 161 receives second
Feedback signal VFB2, the normal phase input end of first comparator 161 receives brownout threshold signal UV, when enable signal EN is effective, the
One comparator 161 is by the second feedback signal VFB2Compare with brownout threshold signal UV, and defeated in the output end of first comparator 161
First comparison signal CA_UV out.In one embodiment, as the first feedback signal VFB1When less than brownout threshold signal UV, first
Effectively (such as logically high), power switch 11 is switched on comparison signal CA_UV.
The enable end of second comparator 162 receives enable signal EN, and the inverting input terminal of the second comparator 162 receives second
Feedback signal VFB2, the normal phase input end of the second comparator 162 receives overvoltage threshold signal OV, when enable signal EN is effective the
Two voltage comparators are by the second feedback signal VFB2Compare with overvoltage threshold signal OV, and defeated in the output end of the second comparator 162
Second comparison signal CA_OV out.In one embodiment, as the second feedback signal VFB2When greater than overvoltage threshold signal OV, second
Effectively (such as logic low), power switch 11 is forced to be maintained at off state comparison signal CA_OV at this time, prevents power switch
Output voltage V after 11 conductingsOUTThe more rise the more high.In one embodiment, overvoltage threshold signal OV is greater than brownout threshold signal UV.
In the embodiment shown in fig. 9, second control signal PWM2 includes two signals.First comparison signal CA_UV and
Two comparison signal CA_OV are second control signal PWM2.In one embodiment, as the second feedback signal VFB2For an electricity
When pressing signal, first comparator 161 and the second comparator 162 are voltage comparator；As the second feedback signal VFB2For an electric current
When signal, first comparator 161 and the second comparator 162 are current comparator.In other embodiments, comparison circuit 16 may be used also
To include the comparison circuit of other suitable achievable similar functions.
Control unit 17 can be used multiple control modes, for example, 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 modulate or
The control mode that pulse frequency modulated combines.For example, pulse width modulation can be used in the case where normally band carries system
Control method；In the case where system underloading or zero load, the control mode of pulse frequency can be used.
Figure 10 shows a kind of electricity of the control unit 17 of constant on-time (Constant on Time, COT) control
Road schematic diagram.As shown in Figure 10, control unit 17 includes voltage comparator 171 and door 172 or door 173, constant on-time
Generation circuit 174 and rest-set flip-flop 175.Wherein the first feedback voltage signal VFB1It is exported during representing 12 afterflow of diode conducting
Voltage signal VOUTValue.Second input terminal of voltage comparator 171 receives the first feedback voltage signal VFB1, voltage comparator
171 by the first feedback voltage signal VFB1With reference voltage signal VREFCompare, and exports first control signal PWM1 in output end.
First control signal PWM1 is a logic high-low signal, as the first feedback voltage signal VFB1Less than reference voltage signal VREF
When, first control signal PWM1 is effectively (such as logically high).The control of the second comparison signal CA_OV and first is received with door 172 to believe
Number PWM1 is simultaneously done and operation, output and signal.Or door 173 is received and signal and the first comparison signal CA_UV and is done or operation is defeated
Set signal Cs out.Constant on-time generation circuit 174 generates the reset signal C of a fixed turn-on timeR.Rest-set flip-flop
175 set end S receives set signal Cs.The reset terminal R of rest-set flip-flop 175 receives reset signal CR, and exported in output end Q
Control signal PWM.In the embodiment shown in fig. 10, control signal PWM is a logic high-low signal, when control signal PWM has
When effect (such as logically high), power switch 11 is switched on；When control signal PWM is invalid (such as logic low), power switch 11
It is turned off.
Figure 11 shows the circuit diagram of control unit 17 according to another embodiment of the present invention.Implement shown in Figure 11
In example, control unit 17 includes the peak value comparison method structure of voltage and current double -loop control.As shown in figure 11, control unit 17 is wrapped
Include error amplifier 271, voltage comparator 272 and door 273 or door 274, voltage comparator 275 and rest-set flip-flop 276.Error
The first input end of amplifier 271 receives reference voltage signal VREF, it is anti-that the second input terminal of error amplifier 173 receives first
Feedthrough voltage signal VFB1, error amplifier 173 is by the first feedback voltage signal VFB1With reference voltage signal VREFRelatively and by error
Amplification, in output end output error signal EA.The first input end of voltage comparator 272 receives error signal EA, and voltage compares
Second input terminal of device 272 receives ramp signal RAMP, and voltage comparator 272 is by error signal EA and ramp signal RAMP ratio
Compared with, and first control signal PWM1 is exported in output end.First control signal PWM1 is a logic high-low signal.In a reality
It applies in example, when ramp signal RAMP is greater than error signal EA, first control signal PWM1 is effectively (such as logically high).With door
273 reception the second comparison signal CA_OV and first control signal PWM1 are simultaneously done and operation, output and signal.Or door 274 receive with
Signal and the first comparison signal CA_UV and do or operation output set signal Cs.The first input end of voltage comparator 275 receives
Current reference signal VREF_CS, the second input terminal reception current sampling signal V of voltage comparator 275CS, voltage comparator 275 will
Current reference signal VREF_CSWith current sampling signal VCSCompare, and in output end output reset signal CR.In one embodiment
In, current sampling signal VCSRepresent the current value for flowing through power switch 11.The set end S of rest-set flip-flop 276 receives comparison signal
CS, the second comparison signal C of reset terminal R reception of rest-set flip-flop 176R, and control signal PWM is exported in output end Q.In
In embodiment illustrated in fig. 11, control signal PWM is a logic high-low signal, (the example when control signal PWM is effective
It is such as logically high), power switch 11 is switched on；When control signal PWM is invalid (such as logic low), power switch 11 is turned off.
Figure 12 shows a kind of control method 600 for controlling high pressure BUCK switch converters according to an embodiment of the invention
Schematic diagram.Control method shown in Figure 12 can be used in high pressure BUCK switch converters shown in earlier figures 2-11.As before
It states shown in Fig. 2-11, high pressure BUCK switch converters include power switch 11, diode 12, inductance LOUT, capacitor COUT, first
Feed circuit 13 and integrated circuit for controlling high pressure BUCK switch converters.The drain electrode coupling switch of power switch 11 becomes
The input terminal of parallel operation receives DC input voitage VIN, the cathode of the source electrode coupling diode 12 of power switch 11, diode 12
Anode is electrically connected to first with reference to ground GND1.Inductance LOUTIt is coupled in the source electrode of power switch 11 and the output end of switch converters
Between OUT, the first feed circuit 13 is connected between the output end OUT of switch converters and the source electrode of power switch 11, and
Diode 12 generates one during being connected and represents output voltage signal VOUTThe first feedback signal VFB2, the source electrode of power switch 11
Common end with the cathode of diode 12 is as the second reference ground GND2, wherein the second reference ground GND2 is the integrated circuit
Reference ground.The control method includes step 1301-1306.
Step 1301, judge inductive current whether zero passage, that is, judge whether power switch 11 and freewheeling diode 12 close
It is disconnected.When inductive current zero passage, i.e. power switch 11 and freewheeling diode 12 is turned off, and is gone to step 1302, is otherwise continued to judge.
Step 1302, with reference to ground GND1 and second with reference to the voltage difference between ground GND2, generation represents first for detection first
With reference to ground GND1 and second with reference to the second feedback signal V of voltage difference between ground GND2FB2.Wherein, first is height with reference to ground GND1
The reference ground of BUCK switch converters is pressed, the second reference ground GND2 is an integrated circuit for controlling high pressure BUCK switch converters
Reference ground.
Step 1303, judge the second feedback signal VFB2Whether overvoltage threshold is greater than, as the second feedback signal VFB2It was greater than
When pressing threshold value, step 1304 is gone to.
Step 1304, the off state of power switch 11 is kept.In one embodiment, as the second feedback signal VFB2Greatly
When overvoltage threshold, even if first control signal PWM1 is effective, power switch 11 is still held off.
Step 1305, judge the second feedback signal VFB2Whether brownout threshold is less than, as the second feedback signal VFB2Less than deficient
When pressure underloading threshold value, step 1306 is gone to.
Step 1306,11 off state of power switch is kept.
In above method step, step 1305 and step 1306 are shown in after step 1303 and step 1304, this
The technical staff in field is appreciated that in practical work process, step 1303 and step 1305 can occur simultaneously.
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 (12)
1. a kind of high pressure BUCK switch converters, comprising:
Diode；
Power switch, has first end, second end and control terminal, and the first end of power switch receives input voltage, power switch
Second end coupling diode cathode, the control terminal of power switch receives control signal, wherein the anode of diode is electrically connected
To the first reference ground, the common end of power switch second end and diode cathode is as second with reference to ground；
Inductance, with being coupled in the second reference between the output end of switch converters；
First feed circuit, with being coupled in the second reference between the output end of switch converters, and during diode current flow
Generate first feedback signal for representing output voltage signal；
Second feed circuit, with being connected to the first reference second with reference between ground, detection first is with reference to ground with second with reference to ground
Between voltage difference, and generate after power switch and diode are turned off one represent first with reference to and second with reference to ground
Between voltage difference the second feedback signal；And
Control circuit receives the first feedback signal and the second feedback signal, and according to the first feedback signal and the second feedback signal
Generating the turn-on and turn-off of control signal control power switch, wherein control circuit is integrated in an integrated circuit, and second
With reference to the reference ground that ground is integrated circuit.
2. switch converters as described in claim 1, wherein the control circuit includes:
Enabled circuit generates enable signal, and after power switch and diode are turned off, enable signal is effective；
Comparison circuit receives enable signal and the second feedback signal, when enable signal is effective, by the second feedback signal respectively with
Brownout threshold and overvoltage threshold compare, and generate first control signal；Wherein, when the second feedback signal is less than brownout threshold, the
One control signal is used for conducting power switch；When the second feedback signal is greater than overvoltage threshold, first control signal is for keeping
Power switch off state, wherein brownout threshold is less than overvoltage threshold；And
Control unit receives the first feedback signal and first control signal, and is controlled according to the first feedback signal and first
Signal generates control signal.
3. switch converters as described in claim 1, wherein the integrated circuit further include:
First feedback pin, the first feed circuit of coupling receive the first feedback signal；
Second feedback pin, the second feed circuit of coupling receive the second feedback signal；
Ground pin, coupling second is with reference to ground；And
Pin is driven, the control terminal for coupling power switch provides control signal.
4. switch converters as described in claim 1, wherein the power switch is integrated in IC interior, described
Integrated circuit further include:
Input pin receives input voltage signal；
First feedback pin, the first feed circuit of coupling receive the first feedback signal；
Second feedback pin, the second feed circuit of coupling receive the second feedback signal；And
Ground pin, coupling second is with reference to ground；Wherein, the first end coupling input pin of power switch, the second of power switch
End coupling ground pin.
5. switch converters as described in claim 1, wherein second feed circuit includes:
Be connected on first with reference to second with reference to the first resistor and second resistance between ground, wherein the second feedback includes the
Voltage on one resistance and second resistance common end.
6. switch converters as described in claim 3 or 4, wherein second feed circuit includes:
Sampling resistor has a first end and a second end, and sampling resistor first end coupling first is with reference to ground, sampling resistor second end coupling
Connect the second feedback pin；
Operational amplifier, has first input end, the second input terminal and output end, and the first input end of operational amplifier connects
Second input terminal of ground pin, operational amplifier couples the second feedback pin；
Current mirror has the first current terminal and the second current terminal；And
Transistor has source electrode, drain and gate, the first current terminal of the drain electrode coupling current mirror of transistor, the source of transistor
Pole couples the second feedback pin, the output end of the grid coupling operational amplifier of transistor；Wherein, the second current terminal of current mirror
Output end as the second feed circuit provides the second feedback signal, and operational amplifier, current mirror and transistor are integrated in collection
Inside circuit.
7. switch converters as described in claim 3 or 4, wherein the integrated circuit further includes converting pin, and described second
Feed circuit includes:
3rd resistor, with being coupled in the first reference between conversion pin；
4th resistance is coupled between the second feedback pin and conversion pin；
Operational amplifier has first input end coupling ground pin, the second input terminal coupling conversion pin and output end；And
Transistor, has source electrode, drain and gate, and the drain electrode of transistor couples power supply, the source electrode coupling second of transistor
Feedback pin, the output end of the grid coupling operational amplifier of transistor；Wherein, transistor and operational amplifier are integrated in collection
Inside circuit, the source electrode of transistor provides the second feedback signal as the output end of the second feed circuit.
8. switch converters as claimed in claim 2, wherein the first control signal includes the first comparison signal and second
Comparison signal, the comparison circuit include:
First comparator has enable end, first input end, the second input terminal and output end, the enabled termination of first comparator
Enable signal is received, the first input end of first comparator receives the second feedback signal, and the second input terminal of first comparator receives
Brownout threshold signal, when enable signal is effective, first comparator compares the second feedback signal and brownout threshold signal, and
The output end of first comparator exports the first comparison signal, wherein when the second feedback signal is less than brownout threshold, first compares
Signal is used for conducting power switch；And
Second comparator has enable end, first input end, the second input terminal and output end, the enabled termination of the second comparator
Enable signal is received, the first input end of the second comparator receives the second feedback signal, and the second input terminal of the second comparator receives
Overvoltage threshold signal, when enable signal is effective, the second comparator compares the second feedback signal and overvoltage threshold signal, and
The output end of second comparator exports the second comparison signal, wherein when the second feedback signal is greater than overvoltage threshold, second compares
Signal is for keeping power switch off state.
9. switch converters as claimed in claim 2, wherein the enabled circuit includes:
First voltage comparator, receives zero passage threshold signal and the first feedback signal, and by the first feedback signal and zero passage threshold value
Signal compares, and exports enable signal.
10. switch converters as claimed in claim 8, wherein described control unit includes:
Error amplifier receives the first feedback signal and reference voltage signal, and compares the first feedback signal and reference voltage letter
Number and error is amplified, output error signal；
Second voltage comparator receives error signal and ramp signal, and error signal and ramp signal is compared, output second
Control signal；
With door, receives the second comparison signal and second control signal and do and operation, output and signal；
Or door, it receives and signal and the first comparison signal and does or operation, export set signal；
5th voltage comparator receives current reference signal and represents the current sampling signal for flowing through the electric current of power switch, and
Current reference signal and current sampling signal are compared, output reset signal；And
The set end of rest-set flip-flop, including set end, reset terminal and output end, rest-set flip-flop receives set signal, rest-set flip-flop
Reset terminal receive reset signal, and rest-set flip-flop output end export control signal.
11. a kind of for controlling the integrated circuit of high pressure BUCK switch converters, the switch converters include diode, electricity
Sense, the first feed circuit and the second feed circuit, wherein diode cathode passes through the output end of inductance coupling switch converters,
Diode anode electrical connection first is with reference to ground, and for diode cathode as second with reference to ground, the first feed circuit is coupled in the second ginseng
Examine between the output end of switch converters, generate first feedback signal for representing output voltage, the second feed circuit
With being connected to the second reference first with reference between ground, detection first is generated with reference to the voltage difference between ground and the second reference ground
One refers to the second feedback signal of the voltage difference between ground with representing the first reference second, and the integrated circuit includes:
Input pin receives input voltage signal；
First feedback pin receives the first feedback signal；
Second feedback pin receives the second feedback signal；
Ground pin, coupling second is with reference to ground；
Power switch, has first end, second end and control terminal, and the first end coupling input pin of power switch receives input electricity
Pressure, the second end of power switch couple ground pin, and control terminal receives control signal；And
Control circuit receives the first feedback signal and the second feedback signal, and according to the first feedback signal and the second feedback signal
Generate the turn-on and turn-off of control signal control power switch.
12. a kind of control method for controlling high pressure BUCK switch converters, wherein high pressure BUCK switch converters include power
The drain electrode coupling switch of switch, diode and the integrated circuit for controlling high pressure BUCK switch converters, power switch becomes
The input terminal of parallel operation receives input voltage signal, the cathode of the source electrode coupling diode of power switch, and the anode of diode is electrically connected
First is connected to reference to ground, the common end of the cathode of the source electrode and diode of power switch is as second with reference to ground, wherein the second ginseng
It is the reference ground of the integrated circuit with examining, the control method includes:
Judge whether power switch and freewheeling diode are turned off；
After power switch and freewheeling diode are turned off, detection first, with reference to the voltage difference between ground, is produced with reference to ground and second
The second feedback signal of with representing the first reference voltage difference between the second reference ground is given birth to, and the second feedback signal is sent to integrated
Circuit；
Judge whether the second feedback signal is lower than brownout threshold, when the second feedback signal is lower than brownout threshold, conducting power is opened
It closes；And
Judge whether the second feedback signal is higher than overvoltage threshold, when the second feedback signal is higher than overvoltage threshold, power is kept to open
Off state is closed, wherein overvoltage threshold is greater than brownout threshold.
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