CN104319998B - A kind of switching power source control circuit, Switching Power Supply and control method - Google Patents
A kind of switching power source control circuit, Switching Power Supply and control method Download PDFInfo
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- CN104319998B CN104319998B CN201410512743.7A CN201410512743A CN104319998B CN 104319998 B CN104319998 B CN 104319998B CN 201410512743 A CN201410512743 A CN 201410512743A CN 104319998 B CN104319998 B CN 104319998B
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Abstract
This application provides a kind of switching power source control circuit, Switching Power Supply and control method, the ON-OFF control circuit includes turn-on control circuit, peak current limit circuit, Time constant generation circuit and logic drive circuit, the first switch of the turn-on control circuit controlling switch power supply turns on when actual output voltage is less than desired output voltage, peak current limit circuit is used to limit inductive current, Time constant generation circuit is used to produce a Time constant, the control signal that logic drive circuit is used to produce first switch makes in the constant time period of first switch after switch, if exist inductive current reach peak value limitation electric current at the time of, then it is turned off at the moment, if it is not present, then it is turned off at the end of the constant time period.It is possible thereby to which the ON-OFF control circuit, which can be realized, determines Switching Power Supply ON time, can also realize the limitation to inductive current, can effectively avoid because of inductance saturation and caused by the impaired phenomenon of first switch.
Description
Technical field
Present invention design electric and electronic technical field, more particularly to switching power source control circuit, Switching Power Supply and controlling party
Method.
Background technology
Switching Power Supply is typically made up of main power stage circuit and switching power source control circuit, the control circuit of Switching Power Supply with
Main power stage circuit is connected, and the conducting of the main switch in main power stage circuit and pass are controlled with output switch control signal
It is disconnected, so that input voltage is converted into loading required voltage output by Switching Power Supply.
Switching power source control circuit can be divided into fixed-frequency control and VFC to the control mode of main switch.Fixed-frequency control
I.e. switch periods are invariable, and output voltage, i.e. pulse width are adjusted by adjusting the width of switch conduction in a cycle
Modulation.VFC is constant by the ON time or turn-off time that control main switch, by adjusting main switch control
The dutycycle of signal controls the output voltage constant.Constant on-time (Constant on time, abbreviation COT) control is to become
One kind in frequency control, i.e., in each switch periods, when the output voltage of Switching Power Supply is less than its desired output voltage
When, control main switch conducting, control main switch to turn off again after the constant time.
In actual applications, constant on-time control program realizes simple that cost is relatively low, and its stability is better than fixed frequency
Control mode.But this fixation allows main switch to turn on the control mode for allowing it to turn off again after a Time constant, due to not having
The limitation of inductive current, then during main switch turns on, inductance in main power stage circuit it is possible that saturated phenomenon, from
And inductive current is set to increase to robustness (characteristic of switching tube, such as voltage endurance, the maximum born beyond main switch rapidly
Current characteristics etc.), finally burn out main switch.
The content of the invention
In view of this, the present invention provides a kind of switching power source control circuit, Switching Power Supply and control method, existing to solve
Technology when realizing constant on-time controlling switch power supply, because of inductance saturation and caused by the easily impaired problem of main switch.
A kind of switching power source control circuit, it is connected with the main power stage circuit of Switching Power Supply, the main power stage electricity includes
First switch and the inductance being connected with the first switch, the control circuit include：
Turn-on control circuit, the expectation for the actual output voltage according to the Switching Power Supply and the Switching Power Supply are defeated
Go out voltage and produce the first control signal, first control signal is less than the desired output voltage in the actual output voltage
Shi Bianwei effective statuses；
Peak current limit circuit, the second control is produced according to the inductive current for flowing through the inductance and peak value limitation electric current
Signal processed, second control signal are changed into effective status when the inductive current is more than peak value limitation electric current；
Time constant generation circuit, a Time constant control signal is produced according to first switch control signal, it is described constant
Time control signal is changed into useful signal when continuing a Time constant after switching tube conducting；
Logic drive circuit, produced according to first control signal, the second control signal and Time constant control signal
The first switch control signal, to control the first switch turn-on and turn-off；
In each switch periods, when first control signal is changed into effective status, the first switch conducting, until
When any one in the Time constant control signal and the second control signal is changed into effective status, the first switch shut-off.
Preferably, the ON-OFF control circuit also includes a valley point current limiting circuit；
The valley point current limiting circuit is used to produce the 3rd control letter according to the inductive current and valley limitation electric current
Number, the 3rd control signal is changed into useful signal when the inductive current is less than valley limitation electric current；
In each switch periods, during the 3rd control signal is disarmed state, when first control signal becomes
For effective status when, first switch conducting, until any one in the Time constant control signal and the second control signal
Individual when being changed into effective status, the first switch shut-off, during the 3rd control signal is effective status, described first opens
Pass turns off always.
Preferably, the peak current limit circuit includes the first comparison circuit, and first comparison circuit is used to compare
One, which characterizes the sampled signal of the inductive current and one, characterizes the first reference signal of the peak value limitation electric current, and exports and compare
As a result it is used as second control signal.
Preferably, first comparison circuit includes first voltage comparator, first resistor and the first current source；
The first end of the first resistor is connected with the voltage input end of the Switching Power Supply, and another second end passes through described
Current source is grounded；
The input in the same direction of the first voltage comparator is connected to the second end of the first resistor, to receive described
One reference signal, reverse input end are connected at the node that the first switch is connected with the inductance, to receive the sampling
Signal, output end export second control signal.
Preferably, first comparison circuit includes inductive current sample circuit, the second current source and analog-to-digital conversion output
Circuit；
The inductive current sample circuit is used to sample the inductive current, and exports the sampled signal；
Second current source is connected in series with the inductive current sample circuit, for exporting described first with reference to letter
Number；
The input of the analog-to-digital conversion output circuit is connected to second current source and inductive current sampling electricity
The node that road is connected in series, for the voltage signal at the node to be converted into data signal, and export the numeral letter
Number conduct second control signal.
Preferably, the inductive current sample circuit includes the first transistor, second transistor, third transistor, second
Resistance, 3rd resistor, the first operational amplifier；
The first end of the first transistor is connected at the node that the first switch is connected with the inductance, the second end
It is connected by second resistance with the voltage input end of the Switching Power Supply, control terminal is connected with the control terminal of the first switch；
The first input end of first operational amplifier is connected with the second end of the first transistor, the second input
The voltage input end is connected to by the 3rd resistor, output end is connected with the control terminal of the second transistor；
The first end of the second transistor is connected with the second input of the operational amplifier, the second end and described the
The first end of three transistors is connected；
Second end of the third transistor is connected to ground, control terminal and the analog-to-digital conversion by second current source
The feeder ear of output circuit is connected.
Preferably, the analog-to-digital conversion output circuit includes the first phase inverter and the second phase inverter；
The input of first phase inverter is connected with the second end of the second transistor, output end and described second anti-
The input of phase device is connected, and the output end of second phase inverter exports second control signal, first phase inverter with
The feeder ear of second phase inverter is connected with the feeder ear of the analog-to-digital conversion output circuit.
Preferably, the turn-on control circuit includes the second comparison circuit, and second comparison circuit is used for described in comparison
The feedback voltage signal of actual output voltage and one characterizes the second reference voltage signal of the desired output voltage, and exports institute
State the first control signal.
Preferably, second comparison circuit includes line wave generation circuit, compensation circuit, second voltage comparator；
The line wave generation circuit is used to obtain the ripple signal synchronously changed with the inductive current；
The compensation circuit is used for the feedback voltage signal and characterized the second reference electricity of the desired output voltage
Error between pressure signal compensates, to produce a thermal compensation signal；
The inverting input reception ripple signal of the second voltage comparator and folding for the feedback voltage signal
Plus signal, in-phase input end receive the thermal compensation signal and the superposed signal of second reference voltage signal, output end output
First control signal.
A kind of Switching Power Supply, including main power stage circuit and above-mentioned any one switching power source control circuit；
The main power stage circuit includes first switch and the inductance being connected with the first switch；
The switching power source control circuit is connected with the main power stage circuit, with control described first open pass conducting and
Shut-off.
A kind of control method of Switching Power Supply, the main power stage circuit of the Switching Power Supply include first switch and with institute
The connected inductance of first switch is stated, the control method includes：
In each switch periods, the expectation that the Switching Power Supply is less than when the actual output voltage of the Switching Power Supply is defeated
When going out voltage, the first switch is controlled to turn on；
The first switch conducting after a Time constant in, if be more than in the presence of the inductive current for flowing through the inductance or
Electric current is limited equal to a peak value, then controls the first switch to be more than or equal to peak value limitation electric current in the inductive current
When be turned off, otherwise control the first switch after switch continue the Time constant when be turned off.
Preferably, the control method is additionally included in each switch periods, judges whether the inductive current is small
Electric current is limited in a valley；
During the inductive current is more than valley limitation electric current, when the actual output voltage is less than the expectation
During output voltage, the first switch is controlled to turn on；
In a Time constant after first switch conducting, if the inductive current be present is more than or equal to institute
Peak value limitation electric current is stated, then controls first switch quilt when the inductive current is more than or equal to peak value limitation electric current
Shut-off, the first switch is otherwise controlled to be turned off when continuing the Time constant after switch.
During the inductive current is less than or equal to valley limitation electric current, the first switch is controlled to close always
It is disconnected.
It is therefore defeated in the reality of Switching Power Supply in control first switch according to the switching power source control circuit of the present invention
Go out when voltage is less than desired output voltage and turn on, and according to the switch controlling signal of first switch one Time constant of generation, and
The judgement is more than peak value limitation electric current in the Time constant after first switch conducting with the presence or absence of inductive current, if in the presence of,
First switch shut-off then is controlled when inductive current is more than peak value limitation electric current, if being not present, makes first switch after switch
It continue for being turned off during the Time constant.The constant on-time control mode phase that such control mode is realized with prior art
Than, due to realizing limitation to the peak value of inductive current during the conducting of first switch, can avoid because inductance is full and caused by electricity
The phenomenon that inducing current increases rapidly, it can be ensured that inductive current does not easily cause first switch not over the robustness of first switch
Damage.
Brief description of the drawings
Fig. 1 is the circuit diagram of the implementation leakage of switching power source control circuit one according to the present invention；
Fig. 2 is a kind of optional implementation circuit diagram of the peak current limit circuit in Fig. 1；
Fig. 3 is another optional implementation circuit diagram of the peak current limit circuit in Fig. 1；
Fig. 4 a are the schematic diagram of another optional implementation of turn-on control circuit in Fig. 1；
Fig. 4 b are a generation ripple signal and the circuit diagram for being superimposed ripple signal with feedback voltage signal；
Fig. 4 c are a generation thermal compensation signal and the circuit diagram for being superimposed thermal compensation signal with the second reference voltage signal；
Fig. 5 is a kind of optional implementation circuit diagram of the turn-on time generation circuit in Fig. 1；
Fig. 6 is a kind of optional implementation circuit diagram of the valley limiting circuit in Fig. 1；
Fig. 7 is a kind of optional implementation circuit diagram of the logic drive circuit in Fig. 1.
Embodiment
Several preferred embodiments of the present invention are described in detail below in conjunction with accompanying drawing, but the present invention not merely limits
In these embodiments.The present invention covers any replacement, modification, equivalent method and side made in the spirit and scope of the present invention
Case.Thoroughly understand in order that the public has to the present invention, be described in detail in present invention below preferred embodiment specific thin
Section, and description without these details can also understand the present invention completely for a person skilled in the art.
Fig. 1 is the circuit diagram of the implementation leakage of switching power source control circuit one according to the present invention.
Fig. 1 is refer to, switching power source control circuit 1 provided by the invention is connected with the main power stage circuit 2 of Switching Power Supply,
Main power stage circuit 2 includes first switch MA(main switch) and with first switch MAConnected inductance L.Certain main power stage
Circuit 2 can also further comprise continued flow switch MB, output filter resistance Ro, output capacitance Co.Annexation between each element can
Think：First switch MAFirst end (in source electrode and drain electrode) be connected with the voltage input end of Switching Power Supply, inputted with connecing
Voltage VIN, the second end (source electrode with drain electrode another) is connected with inductance L first end, the second end of inductance and output capacitance
CoFirst end be connected, continued flow switch MBFirst end (source electrode and drain electrode in one) with first switch MAThe second end be connected,
Second end is connected to ground, output capacitance CoThe second end be connected to ground, output filter resistance RoBoth ends respectively with output capacitance Co
First end be connected with the second end.Switching power source control circuit 1 is connected with main power stage circuit 2, and specially Switching Power Supply controls
The output end of circuit 1 and first switch MAControl terminal be connected, with to first switch MAControl terminal export and first opened for controlling
Close the first switch control signal Q of MA turn-on and turn-offA, further, continued flow switch MBControl terminal also with Switching Power Supply control
The output end of circuit 1, with receive the output of switching power source control circuit 1 be used for control the of continued flow switch MB turn-on and turn-off
Two switch controlling signal QB, generally, QAWith QBFor complementary signal, i.e. first switch MAWith continued flow switch MBOn off state it is opposite.
Switching power source control circuit 1 includes turn-on control circuit 11, peak current limit circuit 12, Time constant and produces electricity
Road 13 and logic drive circuit 14.
Turn-on control circuit 11 is used for according to the actual output voltage of Switching Power Supply and the desired output voltage of Switching Power Supply
One is produced to be used to control first switch MAFirst control signal Q of conductingS, when the actual output voltage of Switching Power Supply is less than it
During desired output voltage, the first control signal QSIt is changed into effective status.Such as in the first control signal QSFor level signal when, can be with
It is the first control signal Q to select high levelSEffective status, in all embodiments of the invention will using high level be used as first control
Signal Q processedSEffective status.
As shown in figure 1, in the power stage circuit 2 of Switching Power Supply, it can use and be connected in parallel on output capacitance CoBoth ends by
Resistance RaAnd RbThe resitstance voltage divider of composition detects actual switch power source output voltage, and exports that to characterize Switching Power Supply actual
The feedback voltage signal V of output voltagefb.By judging feedback voltage signal VfbSize, current switch power supply can be drawn
Whether actual output voltage is less than the desired output voltage of Switching Power Supply, if being less than, the first control signal QSIt is changed into effective shape
State, to indicate first switch MAConducting.
Peak current limit circuit 12 is used for according to the inductive current IL for flowing through inductance L and peak value limitation electric current Ihs_lim
Produce a controllable first switch MASecond control signal Hs_ILM of shut-off, as inductive current ILElectric current is limited more than peak value
Ihs_limWhen, the second control signal Hs_ILM is changed into effective status.
The effective status that second control signal Hs_ILM becomes refers to the second control signal Hs_ILM in instruction first switch MA
State during shut-off, such as when the second control signal Hs_ILM is level signal, high level can be selected as the second control signal
Hs_ILM effective status, by effective shape using high level as the second control signal Hs_ILM in all embodiments of the invention
State.Peak value limitation electric current Ihs_limIt is the electric current of a predetermined value, its size is according to first switch MARobustness set, one
As be arranged to slightly below first switch MATrouble free service current threshold ISOA(exceed the threshold value, MAIt can be burned).
Time constant generation circuit 13 is used for according to first switch MAFirst switch control signal QAProduce a Time constant
Control signal TON, as first switch MAWhen continuing a Time constant after conducting, Time constant control signal TON is changed into effective shape
State.If TON is level signal, effective status of the high level for TON can be selected, in all embodiments of the invention will with
Effective status of the high level as TON.
Logic drive circuit 14 is used for according to the first control signal QS, the second control signal Hs_ILM and Time constant control
Signal TON processed is produced for controlling first switch MAThe first switch control signal Q of turn-on and turn-offA。
In each switch periods (first switch MASwitch periods) in, as the first control signal QSFor useful signal when,
First switch control signal QAControl first switch MAConducting, until constant on-time control signal TON and the second control signal
When any one in Hs_ILM is changed into useful signal, the first switch control signal QAControl the first switch MAShut-off.
It is therefore defeated in the reality of Switching Power Supply in control first switch according to the switching power source control circuit of the present invention
Go out when voltage is less than desired output voltage and turn on, and according to the switch controlling signal of first switch one Time constant of generation, and
The judgement is more than peak value limitation electric current in the Time constant after first switch conducting with the presence or absence of inductive current, if in the presence of,
First switch shut-off then is controlled when inductive current is more than peak value limitation electric current, if being not present, makes first switch after switch
It continue for being turned off during the Time constant.The constant on-time control mode phase that such control mode is realized with prior art
Than, due to realizing limitation to the peak value of inductive current during the conducting of first switch, can avoid because inductance is full and caused by electricity
The phenomenon that inducing current increases rapidly, it can be ensured that inductive current does not easily cause first switch not over the robustness of first switch
Damage.
Please continue to refer to Fig. 1, the switching power source control circuit 1 according to the present invention may also include valley point current limiting circuit
15, the valley point current limiting circuit is used for according to inductive current ILWith valley limitation electric current Ils_limProduce the 3rd control signal Ls_
ILM, when inductive current is less than valley limitation electric current Ils_limWhen, the 3rd control signal Ls_ILM is effective status.If TON is electricity
Ordinary mail number, effective status of the high level for TON can be selected, in all embodiments of the invention will using high level as
TON effective status.
It is disarmed state period (opposite with effective status) in the 3rd control signal Ls_ILM in each switch periods, when
First control signal QSFor useful signal when, first switch control signal QAControl first switch MAConducting, when constant conduction
Between any one in control signal TON and the second control signal Hs_ILM when being changed into useful signal, the first switch control letter
Number QAControl the first switch MAShut-off.During the 3rd control signal Ls_ILM is effective status, the first switch is always
Shut-off.
Increase inductive current valley point current limiting circuit, limited with the valley to inductive current, switch electricity can be achieved
The output short circuit protection in source, so as to avoiding the state for making first switch be constantly in conducting in Switching Power Supply output short-circuit and
Make output voltage rise phenomenon always.
It is electric that the peak current limit circuit in switching power source control circuit shown in Fig. 1 can specifically include a comparison
Road (the first comparison circuit), the comparison circuit are used for the sampled signal for comparing a sign inductive current and one and characterize peak value limitation electricity
First reference signal of stream, and the second control signal Hs_ using result of the comparison output as peak current limit circuit output
ILM.Wherein, this comparison circuit can be that voltage comparator circuit can also be current comparison circuit.If voltage comparator circuit,
Then sampled signal should be the voltage signal of a sign inductive current, and the first reference signal is then sign peak limiter circuit
Voltage signal, as shown in Figure 2.Similarly, if current comparison circuit, then sampled signal is the electric current letter of a sign inductive current
Number, the first reference voltage also should be a current signal, as shown in Figure 3.
Fig. 2 is a kind of optional implementation circuit diagram of the peak current limit circuit in Fig. 1, its be voltage ratio compared with
Circuit, for comparing the voltage signal and a voltage signal for characterizing peak value limitation electric current of a sign inductive current, with defeated
Go out the second control signal Hs_ILM.As shown in Fig. 2 the circuit includes first voltage comparator Comp1, first resistor R1With first
Current source.First resistor R1First end be connected to the voltage input end of Switching Power Supply, to receive input voltage VIN, the second end leads to
Cross the first current source I1Ground connection, first voltage comparator Comp1 in-phase input end are connected to first resistor R1 the second end,
To receive the voltage V at the end1, reverse input end is connected to first switch M in Fig. 1AAt the node Lx being connected with inductance L, to connect
Receive the voltage V at the nodeLX, the second control signal Hs_ILM of output end output.The V it can be seen from circuit connecting relationLX=
VIN-RdS×IL, wherein, RsdFor the conducting resistance of first switch, then VLXInductive current I is characterized for oneLVoltage signal, i.e.,
First voltage comparator Comp1 inverting input, which receives, characterizes inductive current ILVoltage signal VLX, i.e., above-mentioned sampling letter
Number.Again it can be seen that V1=VIN-I1×R1, wherein I1For the output current of the first current source, its size limits according to peak value
Electric current Ihs_limTo set, therefore first voltage comparator Comp1 in-phase input end receives one and characterizes peak value limitation electric current
Voltage signal, i.e., the first above-mentioned reference signal.Due to VLX=V1When, saltus step occurs for first voltage comparator Comp1, therefore,
IL=I1×R1/RdsFor first voltage comparator Comp1 trip point, then by the first power supply I1Output current I1It should set
Into equal to Ihs_lim×Rds/R1.Work as IL>I1×R1/RdsWhen, the second control signal Hs_ILM is high level signal, that is, is changed into effective
Signal, it may indicate that first switch MAShut-off.
Fig. 3 is another optional implementation circuit diagram of the peak current limit circuit in Fig. 1, and it is an electric current ratio
Compared with circuit, current signal and one for comparing a sign inductive current characterize the current signal of peak value limitation electric current, with output
Second control signal Hs_ILM.As shown in figure 3, the peak current limit circuit 12Including inductive current sample circuit 12-1,
Two current source I2With analog-to-digital conversion output circuit 12-2.
Inductive current sample circuit 12-1 is used to sample inductive current IL, and export the sampling letter of a sign inductive current
Number, sampled signal here is current signal Iout, IoutFor an electric current proportional to inductive current.Second current source I2With
Inductive current sample circuit is connected in series (i.e. the second current source I2The output of output current and inductive current sample circuit electric current
IoutIn the same direction, the two is series current), for output current I2(first reference signal for characterizing peak value limitation electric current).Number
Analog conversion circuit 12-2 input end is connected to the second current source I2The node J being connected in series with inductive current sample circuit 12-1
Place, for the voltage signal at node J to be converted into data signal, and export the second control signal Hs_ILM.
With continued reference to Fig. 3, in a preferred embodiment, inductive current sample circuit 12-1 can include first crystal
Pipe M1, second transistor M2, third transistor M3, second resistance R2, 3rd resistor R3With the first operational amplifier OP.Wherein,
One transistor M1First end be connected to first switch MAAt the node Lx being connected with inductance L, the second end passes through second resistance R2With
Voltage input end (the input voltage V of Switching Power SupplyINInput) be connected, control terminal and first switch MAControl terminal be connected.
First operational amplifier OP first input end is connected with the second end of the first transistor, and the second input passes through 3rd resistor
R3 is connected to the voltage input end of Switching Power Supply, output end and second transistor M2Control terminal be connected.Second transistor M2
One end is connected with operational amplifier OP the second input, the second end and third transistor M3First end be connected, the 3rd crystal
Pipe M3Second pass through the second current source I2Ground connection, the control terminal of third transistor and the feeder ear phase of analog-to-digital conversion output circuit
Even, to receive identical voltage Vcc(supply voltage of switching power source control circuit), using by the voltage clamp at node J as one
The voltage to match with the voltage of the feeder ear of analog-to-digital conversion output circuit.
In above-mentioned annexation, first end is one end in the source terminal and drain electrode end of transistor, and the second end is source electrode
End and the other end of drain electrode end.In peak current limit circuit 12, the first transistor M1With first switch MAForm current mirror,
Then second resistance R2On electric current ISENFor one and inductive current ILProportional electric current, then input to the first operational amplifier
The voltage of first input end is one and inductive current ILProportional voltage, can by the empty short and empty disconnected principle of operational amplifier
Draw, the voltage inputted to first the second input of operational amplifier is also a voltage proportional to inductive current, is flowed through
3rd resistor R3On an electric current also electric current proportional to inductive current, therefore pass through second transistor M2The second end it is defeated
The electric current I gone outoutAlso with inductive current ILIt is proportional, i.e. IoutInductive current I is characterized for oneLCurrent signal, due to the 3rd brilliant
Body pipe M3With second transistor M2Series connection, then the electric current for flowing through third transistor M3 is also electric current Iout, i.e. third transistor M3's
Second end is the sampled signal output end of inductive current sample circuit.As the sampled signal I of inductive currentoutMore than the second electric current
The electric current I of source output2When, the voltage at node J is more than a presetting reference value (such as zero), works as IoutLess than the second current source
The electric current I of output2When, the voltage at node J is less than or equal to a presetting reference value.Analog-to-digital conversion output circuit 12-2 will
Voltage conversion at node J exports into data signal, and the data signal of output is the second control signal Hs_ILM.As node J
When the voltage at place is more than the presetting reference value, show now to need the peak value for limiting inductive current, the control of output second
Signal Hs_ILM is changed into effective status, to indicate first switch MAShut-off.Voltage at node J is less than or equal to described default
During fixed reference value, show now limit the peak value of inductive current, the second control signal Hs_ILM of output is changed into invalid
State, first switch MAIt is turned off after switch by a Time constant.
Referring next to Fig. 3, analog-to-digital conversion output circuit can be to include the first phase inverter N1With the second phase inverter N2Electricity
Road.Wherein, the input of the first phase inverter and second transistor M2The second end be connected, be attached to second transistor M2With
Two current source I2At the node J of series connection, output end and the second phase inverter N2Input be connected, the second phase inverter N2Output end
Export the second control signal Hs_ILM, and the first phase inverter N1Feeder ear and the second phase inverter N2Feeder ear with modulus turn
The feeder ear for changing output circuit is connected, i.e., with third transistor M3Control terminal be connected, to receive identical voltage Vcc.Work as node
When voltage at J is more than the presetting reference value, the first phase inverter N1Export low level, the second phase inverter N2The high electricity of output
Flat, i.e., the second control signal Hs_ILM is changed into effective status, otherwise the second control signal Hs_ILM is changed into disarmed state.
Turn-on control circuit in Fig. 1 is used to be judged according to the size of actual output voltage and desired output voltage
It is no to need to turn on first switch MA, its implementation has a variety of, such as can be a comparison circuit (the second comparison circuit), should
Two comparison signal inputs of comparison circuit input the feedback voltage signal of the actual output voltage of current switch power supply respectively
VfbWith a second reference voltage signal V for characterizing Switching Power Supply desired output voltageref, output end exports the comparative result of the two,
And using comparative result as the first control signal QS, as feedback voltage signal VfbLess than the second reference voltage signal VrefWhen, first
Control signal QSIt is changed into effective status, may indicate that first switch MAConducting.
Fig. 4 a are the schematic diagram of another optional implementation of turn-on control circuit in Fig. 1.
It refer to shown in Fig. 4 a, for the control first switch M of faster response speedA, turn-on control circuit can compare
Ripple control is introduced, by feedback voltage signal VfbWith the ripple synchronously changed with inductive current produced by a ripple generation circuit
Signal VrippleAfter superposition with one sign Switching Power Supply desired output voltage the second reference voltage signal VrefIt is compared.For
Compensation ripple signal VrippleThe influence brought to output voltage, compensation circuit can also be added, for by feedback voltage signal
VfbWith the second reference voltage signal VrefBetween error compensate, to produce a thermal compensation signal Vcorr, then again will superposition
The feedback voltage signal of ripple signal is compared with the second reference voltage signal for being superimposed thermal compensation signal, to export first
Control signal QS.Therefore, turn-on control circuit as shown in fig. 4 a includes being used to obtain the ripple synchronously changed with inductive current
The ripple generation circuit of signal, for feedback voltage signal VfbWith the second reference voltage signal VrefBetween error mended
Repay to produce the anti-phase input termination of the compensation circuit of thermal compensation signal and second voltage comparator, wherein second voltage comparator
Receive the feedback voltage signal (V for being superimposed ripple signalfb+Vripple), in-phase input end receives the second ginseng for being superimposed thermal compensation signal
Examine voltage signal (Vref+Vcorr), output end exports the first control signal QS。
Fig. 4 b are a generation ripple signal and the circuit diagram for being superimposed ripple signal with feedback voltage signal, as schemed institute
Show, the circuit includes current source I3, switch S1, switch S2, resistance R3, electric capacity C1, electric capacity C2, resistance R4, resistance R5, voltage controlled current
Source I4, transistor M3And bias current sources IB.Wherein, current source I3By switching S1With switching S2First end be connected, switch
S2Second end passes through resistance R3It is connected to ground, electric capacity C1First end ground connection, the second end with switch S2First end be connected, resistance R4
First end and electric capacity C1The second end be connected, the second end and electric capacity C2First end be connected, electric capacity C2The second end ground connection, electricity
Hinder R4Upper voltage is voltage-controlled current source I4Control voltage, resistance R5With voltage-controlled current source I4It is connected in series, transistor M3On control
End processed receives feedback voltage signal Vfb, first end and resistance R5One end be connected, the second end ground connection, bias current sources IBFor to
Transistor M3Bias current is provided.Switch S1With the M of first switchAIt is synchronous, switch S2Control signal and Switching Power Supply it is standby
Signal is synchronous, therefore, electric capacity C1On voltage and electric capacity C2On voltage difference (size of the voltage difference is | VC1-VC2|, i.e. resistance
R4On voltage) be a voltage signal synchronous with inductive current, with the signal control voltage controlled current prediction scheme I5The electricity of output
It is also an electric current synchronous with inductive current to flow, therefore R5On voltage be a voltage signal synchronous with inductive current,
The ripple signal V obtainedripple, and ripple signal VrippleWith feedback voltage signal Vfb(i.e. V is exported after superpositionfb+
Vripple)。
Fig. 4 c are a generation thermal compensation signal and the circuit diagram for being superimposed thermal compensation signal with the second reference voltage signal, as schemed institute
Show, the circuit includes a trsanscondutance amplifier Gm, electric capacity C3, voltage-controlled current source I5, resistance R6, transistor M4And bias current sources
IB.Wherein, trsanscondutance amplifier Gm in-phase input end receives feedback voltage signal Vfb, inverting input the second reference voltage of reception
Signal Vref, output end passes through electric capacity C3Ground connection, electric capacity C3Voltage control voltage-controlled current source I5Electric current, resistance R6With voltage-controlled electricity
Stream source I5It is connected in series, transistor M4On control terminal receive feedback voltage signal Vref, first end and resistance R6One end be connected,
Second end is grounded, bias current sources IBFor giving transistor M4Bias current is provided.C3Voltage be one and VfbAnd VrefDifference
It is worth related voltage, therefore R6On voltage can characterize feedback voltage signal VfbWith the second reference voltage signal VrefBetween it
Between error, i.e., required for caused by thermal compensation signal Vcorr, and thermal compensation signal VcorrWith feedback voltage signal VrefExported after superposition
(i.e. Vref+Vcorr)。
Fig. 5 is a kind of optional implementation circuit diagram of the turn-on time generation circuit in Fig. 1, and the circuit can include opening
Close S3, current source I6, electric capacity C4And voltage comparator Comp3.Wherein, current source I6By switching S3Ground connection, switch S3According to
First switch MAControl signal QANon-signal control conducting and shut-off, i.e., it is opposite with the on off state of first switch.Electric capacity C4
Both ends respectively with switch S3Both ends be connected, voltage comparator Comp3 in-phase input end receives electric capacity C4On voltage VC4,
Inverting input receives a reference voltage VN, VNThe electric capacity C in a constant value can also be Fig. 4 b2On voltage VC2.When first
Switch MADuring conducting, S is switched4Shut-off, current source I6To electric capacity C4Charging, works as VC4Equal to VNWhen, voltage comparator Comp3 outputs
Time constant control signal TON be changed into effective status.
Fig. 6 is a kind of optional implementation circuit diagram of the valley limiting circuit in Fig. 1, and the circuit can include voltage ratio
Compared with device Comp4, resistance R7, current source I7.Wherein, resistance R7First end be connected to first switch MAThe node being connected with inductance L
Locate Lx, to receive the voltage V at thisLX, the second end is connected with voltage comparator Comp4 inverting input, current source I7Connection
In power end and resistance R7The second end between, voltage comparator Comp4 in-phase input end ground connection.Work as voltage comparator
The voltage V of Comp4 inverting input3More than anti-phase input terminal voltage V2When, the valley limitation signal Ls_ILM the (the 3rd of output
Control signal) it is useful signal.
Fig. 7 be Fig. 1 in logic drive circuit a kind of optional implementation circuit diagram, the circuit can bag OR gate OR,
With door AND, rest-set flip-flop and drive circuit.Wherein, OR gate OR input receive the second control signal Hs_ILM and it is constant when
Between control signal TON, export QretSignal receives the first control signal to the reset terminal R of rest-set flip-flop with door AND input
QSWith the 3rd control signal Ls_ILM, Q is exportedsetTo the set end S of rest-set flip-flop, the output end of rest-set flip-flop mutually drives signal
Circuit output pwm signal, to control drive circuit output first switch MAWith continued flow switch MBSwitch controlling signal QA、QB。
According to switching power source control circuit provided by the invention, the present invention also provides a kind of Switching Power Supply, the switch electricity
Source includes above-mentioned any one switching power source control circuit, and main power stage circuit.Wherein, main power stage circuit is opened including first
The inductance for closing and being connected with first switch, its topological structure can be that Buck can also be the types such as Boost.Switching Power Supply control
Circuit processed is connected with main power stage circuit, the turn-on and turn-off of a control first switch.
In addition, present invention also offers a kind of control method of Switching Power Supply, wherein, the Switching Power Supply controlled includes the
One switch and the inductance being connected with first switch, the control method are specially：
In each switch periods, the expectation that the Switching Power Supply is less than when the actual output voltage of the Switching Power Supply is defeated
When going out voltage, the first switch is controlled to turn on；
The first switch conducting after a Time constant in, if be more than in the presence of the inductive current for flowing through the inductance or
Electric current is limited equal to a peak value, then controls the first switch to be more than or equal to peak value limitation electric current in the inductive current
When be turned off, otherwise control the first switch after switch continue the Time constant when be turned off.
Further,, can be with each switch periods in order to realize short-circuit protection control to Switching Power Supply
Judge whether inductive current is less than valley limitation electric current；
During the inductive current is more than valley limitation electric current, when the actual output voltage is less than the expectation
During output voltage, the first switch is controlled to turn on；
In a Time constant after first switch conducting, if the inductive current be present is more than or equal to institute
Peak value limitation electric current is stated, then controls first switch quilt when the inductive current is more than or equal to peak value limitation electric current
Shut-off, the first switch is otherwise controlled to be turned off when continuing the Time constant after switch.
During the inductive current is less than or equal to valley limitation electric current, the first switch is controlled to plant pass always
It is disconnected.
Switching Power Supply control method provided by the invention, the same of constant on-time control can be being realized to Switching Power Supply
When, peak value and valley to inductive current limit, effectively to prevent inductance saturation from carrying out short-circuit protection, and controlling party
Formula is simple
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and other
The difference of embodiment, between each embodiment same or similar part mutually referring to.
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (12)
1. a kind of switching power source control circuit, be connected with the main power stage circuit of Switching Power Supply, the main power stage electricity includes the
One switch and the inductance being connected with the first switch, the control circuit include：
Turn-on control circuit, for the actual output voltage according to the Switching Power Supply and the desired output of Switching Power Supply electricity
Pressure produces the first control signal, and first control signal is less than the desired output voltage time-varying in the actual output voltage
For effective status；
Peak current limit circuit, the second control is produced according to the inductive current for flowing through the inductance and peak value limitation electric current and believed
Number, second control signal is changed into effective status when the inductive current is more than peak value limitation electric current；
Time constant generation circuit, a Time constant control signal, the Time constant are produced according to first switch control signal
Control signal is changed into useful signal when continuing a Time constant after first switch conducting；
Logic drive circuit, according to producing first control signal, the second control signal and Time constant control signal
First switch control signal, to control the first switch turn-on and turn-off；
In each switch periods, when first control signal is changed into effective status, the first switch conducting, until described
When any one in Time constant control signal and the second control signal is changed into effective status, the first switch shut-off so that
If the inductive current is more than peak value limitation electric current in the Time constant, the switching power source control circuit controls institute
First switch shut-off is stated, if the inductive current is less than or equal to peak value limitation electric current, institute in the Time constant
Switching power source control circuit is stated to control the first switch after switch and continue to be turned off during the Time constant.
2. switching power source control circuit according to claim 1, it is characterised in that also limit electricity including a valley point current
Road；
The valley point current limiting circuit is used to produce the 3rd control signal, institute according to the inductive current and valley limitation electric current
State the 3rd control signal and be changed into useful signal when the inductive current is less than valley limitation electric current；
In each switch periods, during the 3rd control signal is disarmed state, when first control signal is changed into having
During effect state, the first switch conducting, until any one in the Time constant control signal and the second control signal becomes
For effective status when, first switch shut-off, during the 3rd control signal is effective status, the first switch one
Straight shut-off.
3. switching power source control circuit according to claim 1, it is electric that the peak current limit circuit includes the first comparison
Road, first comparison circuit are used for the sampled signal for comparing the sign inductive current and one and characterize the peak value limitation electricity
First reference signal of stream, and comparative result is exported as second control signal.
4. control circuit according to claim 3, first comparison circuit includes first voltage comparator, first resistor
With the first current source；
The first end of the first resistor is connected with the voltage input end of the Switching Power Supply, and the second end passes through first electric current
Source is grounded；
The input in the same direction of the first voltage comparator is connected to the second end of the first resistor, to receive first ginseng
Signal is examined, reverse input end is connected at the node that the first switch is connected with the inductance, to receive the sampled signal,
Output end exports second control signal.
5. switching power source control circuit according to claim 3, first comparison circuit includes inductive current sampling electricity
Road, the second current source and analog-to-digital conversion output circuit；
The inductive current sample circuit is used to sample the inductive current, and exports the sampled signal；
Second current source is connected in series with the inductive current sample circuit, for exporting first reference signal；
The input of the analog-to-digital conversion output circuit is connected to second current source and the inductive current sample circuit string
Join the node of connection, for the voltage signal at the node to be converted into data signal, and export the data signal conduct
Second control signal.
6. switching power source control circuit according to claim 5, the inductive current sample circuit include the first transistor,
Second transistor, third transistor, second resistance, 3rd resistor, the first operational amplifier；
The first end of the first transistor is connected at the node that the first switch is connected with the inductance, and the second end passes through
Second resistance is connected with the voltage input end of the Switching Power Supply, and control terminal is connected with the control terminal of the first switch；
The first input end of first operational amplifier is connected with the second end of the first transistor, and the second input passes through
The 3rd resistor is connected to the voltage input end, and output end is connected with the control terminal of the second transistor；
The first end of the second transistor is connected with the second input of the operational amplifier, and the second end is brilliant with the described 3rd
The first end of body pipe is connected；
Second end of the third transistor is connected to ground by second current source, and control terminal exports with the analog-to-digital conversion
The feeder ear of circuit is connected.
7. switching power source control circuit according to claim 6, the analog-to-digital conversion output circuit includes the first phase inverter
With the second phase inverter；
The input of first phase inverter is connected with the second end of the second transistor, output end and second phase inverter
Input be connected, the output end of second phase inverter exports second control signal, first phase inverter with it is described
The feeder ear of second phase inverter is connected with the feeder ear of the analog-to-digital conversion output circuit.
8. control circuit according to claim 1, it is characterised in that it is electric that the turn-on control circuit includes the second comparison
Road, second comparison circuit are used for the feedback voltage signal of the actual output voltage and one and characterize the desired output
Second reference voltage signal of voltage, and export first control signal.
9. switching power source control circuit according to claim 8, it is characterised in that second comparison circuit includes ripple
Generation circuit, compensation circuit, second voltage comparator；
The line wave generation circuit is used to obtain the ripple signal synchronously changed with the inductive current；
The compensation circuit is used for the feedback voltage signal and characterized the second reference voltage letter of the desired output voltage
Error between number compensates, to produce a thermal compensation signal；
The inverting input of the second voltage comparator receives the superposition letter of the ripple signal and the feedback voltage signal
Number, in-phase input end receives the superposed signal of the thermal compensation signal and second reference voltage signal, described in output end output
First control signal.
10. a kind of Switching Power Supply, including main power stage circuit and the Switching Power Supply control as described in any one in claim 1~9
Circuit processed；
The main power stage circuit includes first switch and the inductance being connected with the first switch；
The switching power source control circuit is connected with the main power stage circuit, to control the conducting of the first switch and pass
It is disconnected.
11. a kind of control method of Switching Power Supply, the main power stage circuit of the Switching Power Supply include first switch and with institute
The connected inductance of first switch is stated, the control method includes：
In each switch periods, when the actual output voltage of the Switching Power Supply is less than the desired output electricity of the Switching Power Supply
During pressure, the first switch is controlled to turn on；
In a Time constant after first switch conducting, if being more than or equal in the presence of the inductive current for flowing through the inductance
One peak value limits electric current, then controls first switch quilt when the inductive current is more than or equal to peak value limitation electric current
Shut-off, the first switch is otherwise controlled to be turned off when continuing the Time constant after switch.
12. control method according to claim 11, it is characterised in that be additionally included in each switch periods, sentence
Whether the inductive current that breaks is less than valley limitation electric current；
During the inductive current is more than valley limitation electric current, when the actual output voltage is less than the desired output
During voltage, the first switch is controlled to turn on；
In a Time constant after first switch conducting, if the inductive current be present is more than or equal to the peak
Value limitation electric current, then the first switch is controlled to be closed when the inductive current is more than or equal to peak value limitation electric current
It is disconnected, otherwise control the first switch to be turned off when continuing the Time constant after switch；
During the inductive current is less than or equal to valley limitation electric current, the first switch is controlled to turn off always.
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| US10148260B2 (en) * | 2015-06-12 | 2018-12-04 | Infineon Technologies Ag | Pulse-density modulated fast current controller |
| CN106028557B (en) * | 2016-07-08 | 2018-01-05 | 上海灿瑞科技股份有限公司 | The constant current driver circuit for LED of the low total harmonic distortion of High Power Factor |
| CN111431405B (en) * | 2020-04-13 | 2021-05-14 | 矽力杰半导体技术(杭州)有限公司 | Voltage ripple control circuit and control method |
| CN111817562B (en) * | 2020-07-08 | 2021-06-22 | 无锡力芯微电子股份有限公司 | Buck type DC-DC converter |
| CN112104209B (en) * | 2020-08-18 | 2022-06-21 | 晶艺半导体有限公司 | Quasi-valley bottom control circuit and method and switch converter thereof |
| CN112018730B (en) * | 2020-10-16 | 2021-01-15 | 深圳英集芯科技有限公司 | Switching power supply protection circuit and switching power supply chip |
| CN112865503B (en) * | 2021-01-29 | 2022-07-15 | 广州视琨电子科技有限公司 | Peak current limiting circuit, DC-DC conversion device and power supply |
| CN112994421B (en) * | 2021-05-20 | 2021-08-20 | 珠海市杰理科技股份有限公司 | Overcurrent protection circuit, DC/DC converter and power management chip |
| CN113485502A (en) * | 2021-06-29 | 2021-10-08 | 昂宝电子（上海）有限公司 | Constant current control chip, power system and constant current control method |
| CN113991992B (en) * | 2021-10-26 | 2023-09-12 | 深圳市单源半导体有限公司 | Short-circuit protection circuit and method for COT control mode DC-DC converter |
| CN114944748B (en) * | 2022-07-20 | 2022-11-18 | 中科(深圳)无线半导体有限公司 | Constant frequency control circuit and method for constant on-time control mode converter |
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