CN104578800B - Control circuit of switch power supply and switch power supply provided with control circuit - Google Patents
Control circuit of switch power supply and switch power supply provided with control circuit Download PDFInfo
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- CN104578800B CN104578800B CN201410852628.4A CN201410852628A CN104578800B CN 104578800 B CN104578800 B CN 104578800B CN 201410852628 A CN201410852628 A CN 201410852628A CN 104578800 B CN104578800 B CN 104578800B
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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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
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Abstract
The invention provides a control circuit of a switch power supply and the switch power supply provided with the control circuit. The control circuit obtains a first feedback signal representing output voltage of the switch power supply and judges the amplitude relationship of the first feedback signal and a first threshold signal. During the period when the first feedback signal is smaller than the first threshold signal, the on-off state of a main switch tube is controlled in a peak current mode. During the period when the first feedback signal is larger than the first threshold signal, the on-off state of the main switch tube is controlled in a constant on-time control mode. The switch power supply has the advantages of being quickly started, quickly supplying power and being low in circuit-short power consumption while achieving high PE performance.
Description
Technical field
The present invention relates to a kind of Power Electronic Technique, and in particular to the control circuit of Switching Power Supply and opening with the circuit
Powered-down source.
Background technology
Switching Power Supply generally comprises power stage circuit, control circuit, power supply circuit and starts resistance.When in Switching Power Supply
After electricity, the input direct voltage of input to power stage circuit is by starting resistance for the partially installing capacitor in power supply circuit is filled
Electricity, when the voltage on partially installing capacitor reaches the startup voltage of control circuit, control circuit starts to start, because control circuit is opened
Begin to start work, control circuit internal circuit can extract substantial amounts of electric current from starting at the node that resistance is connected with partially installing capacitor,
Voltage on partially installing capacitor can drop, and subsequent power supply circuit fills according to the output voltage size of Switching Power Supply to its partially installing capacitor
Electricity, makes the voltage on partially installing capacitor slowly go up and is maintained the supply voltage of control circuit normal work needs, controls circuit
With the switch motion of the main switch of certain control model controlling switch power supply, so that Switching Power Supply output meets load need
The voltage asked.
The Switching Power Supply of constant on-time control model control, because scheme realizes that simply cost is relatively low, and stability
Preferably it is widely used.But when realizing that Switching Power Supply is controlled using this constant on-time control model, in order to anti-
Only during control source, output current occurs the phenomenon of overshoot, it will usually by Switching Power Supply during the constant conduction of main switch
Between preset it is smaller, cause the slow-footed problem of control loop, the output voltage of Switching Power Supply is reached loading demand voltage
The required time is elongated, i.e. output voltage sets up that speed is slower, then the speed that power supply circuit charges to partially installing capacitor also compared with
Slowly, so that voltage on partially installing capacitor needs longer time slowly to go up after circuit start is controlled and is maintained control
Supply voltage required for circuit normal work processed.Therefore, it is power supply in order to be able to quickly make the voltage stabilization on partially installing capacitor
Voltage, the capacitance of partially installing capacitor generally needs the larger of setting, makes the drop after circuit start is controlled of the voltage of partially installing capacitor
Speed is slower, but excessive partially installing capacitor can cause again the voltage on partially installing capacitor rise to control circuit startup voltage when
Between extend, reduce the toggle speed of control circuit, it is final or Switching Power Supply can not be made quickly to enter steady operation.
In order to solve the above problems, a kind of way of prior art is using less startup resistance, to accelerate control electricity
The toggle speed on road.Another way of prior art is to set high-voltage tube inside control circuit, after electricity in Switching Power Supply,
The high-voltage tube is turned on, the DC voltage in input to the power stage circuit of Switching Power Supply is carried to control circuit by the high-voltage tube
For starting voltage, control circuit capable of fast starting.However, former prior art is because need will be small after circuit start is controlled
Startup resistance switch to big resistance, it is necessary to additionally increase more peripheral components, high cost takes up space big；Latter shows
Although having technology can reduce peripheral components, due to needing to be internally integrated high-voltage tube in control chip, can increase manufacturing cost and
Technology difficulty.Additionally, existing two kinds of technologies only accelerate the toggle speed of control circuit, and can not further solve output
The slow-footed problem of Voltage Establishment, therefore can not improve the Switching Power Supply using the control of constant conduction control model, it is control
Circuit is powered slow-footed problem, and Switching Power Supply still can not quickly enter steady-working state.
The content of the invention
In view of this, the invention provides a kind of control circuit of Switching Power Supply and the Switching Power Supply with the circuit solving
In the Switching Power Supply controlled in particular by constant conduction control model in certainly existing Switching Power Supply, due to being that control circuit is supplied
Electric speed makes Switching Power Supply enter the slow problem of steady state speed slowly.
A kind of control circuit of Switching Power Supply, is provided with main switch in the Switching Power Supply, the control circuit includes：
Voltage feedback circuit, the first feedback signal for obtaining the output voltage for characterizing the Switching Power Supply；
Output voltage detecting circuit, the magnitude relationship for detecting first feedback signal and first threshold signal；
Current feedback circuit, the second feedback signal of the electric current for flowing through the main switch is characterized for obtaining；
Peak current limit circuit, for during first feedback signal is less than the first threshold signal, limiting
The peak value of second feedback signal, and effective peak value limit is exported when second feedback signal reaches limited peak value
Signal is determined, to control the main switch to turn off；
Constant on-time produce circuit, for first feedback signal be more than the first threshold signal during,
The ON time of the main switch is controlled for a Time constant, and when the ON time of the main switch reaches described constant
Between when export effective Time constant signal, to control the main switch to turn off.
Preferably, the control circuit also includes that supply voltage detects circuit, the power supply for detecting the control circuit
The magnitude relationship of voltage and the first reference voltage, the second reference voltage and tertiary voltage, and power supply detection signal is exported, make institute
State control circuit to be started working when the supply voltage reaches second reference voltage, first is more than in the supply voltage
Reference voltage or less than the 3rd reference voltage during control the main switch to turn off always,
Wherein, first reference signal is more than second reference signal, and second reference signal is more than described the
Three reference signals.
Preferably, the control circuit also bag logic circuit, signal, Time constant letter are limited for receiving the peak value
Number, power supply detection signal and conductivity control signal, and the switch controlling signal of the main switch is exported, wherein the conducting
Control signal is the signal of the triggering main switch conducting.
Preferably, the output voltage detecting circuit is additionally operable to detection first feedback signal and Second Threshold signal
Magnitude relationship, the Second Threshold signal is less than the first threshold signal；
The peak current limit circuit, will be described during first feedback signal is less than the Second Threshold signal
The peak value of the second feedback signal is defined to the 3rd threshold signal, first feedback signal more than the Second Threshold signal and
During less than the first threshold signal, the peak value of second feedback signal is defined to the 4th threshold signal；
Wherein, the 3rd threshold signal is less than the 4th threshold signal.
Preferably, the output voltage detecting circuit includes first comparator and the second comparator, the first comparator
For comparing first feedback signal and first threshold signal, and the first comparison signal is exported, second comparator is used for
Compare first feedback signal and the Second Threshold signal, and export the second comparison signal.
Preferably, the peak current limit circuit includes first switch, second switch, the 3rd comparator, first anti-phase
Device and first and door,
The first end of the first switch receives the 3rd threshold signal, the second end and the first of the 3rd comparator
Input is connected, and switch control terminal receives the signal opposite with the second comparison signal state.
The first end of the second switch receives the 4th threshold signal, the second end and the first of the 3rd comparator
Input is connected, and switch control terminal receives second comparison signal,
Second input of the 3rd comparator receives second feedback signal, output end to described first with door
First input end exports the 3rd comparison signal,
The input of first phase inverter receives first comparison signal, and described first terminates with the second input of door
The output signal of first phase inverter is received, output end exports the peak value and limits signal.
Preferably, the constant on-time produce circuit include charging capacitor, charging control switch, charging current source,
4th comparator and second and door；
When the main switch is turned on, the charging control switch shut-off, the charging current source is to the electricity that charges
Capacity charge, when the main switch is turned off, the charging control switch conducting, the charging capacitor is by the charge control
Switch discharge,
The first input end of the 4th comparator receives the voltage on the charging capacitor, and the second input is received and characterized
The reference voltage of the Time constant, and export the 4th comparison signal, described second with the first input end of door to described second
First comparison signal is received with the second input of door, output end exports the Time constant signal.
Preferably, the supply voltage detection circuit includes the 5th comparator, the 6th comparator and the 7th comparator,
5th comparator is used to compare the supply voltage and the size of first reference voltage, and exports the 5th
Comparison signal,
6th comparator is used to compare the supply voltage and the size of second reference voltage, and exports the 6th
Comparison signal,
7th comparator is used to compare the supply voltage and the size of the 3rd reference voltage, and exports the 7th
Comparison signal,
5th comparison signal, the 6th comparison signal and the 7th comparison signal are collectively as the power supply detection letter
Number.
Preferably, the logic circuit includes the first rest-set flip-flop, the second phase inverter, OR gate, the 3rd and door and second
Rest-set flip-flop,
The input of first phase inverter receives the 5th comparison signal, output end and the described 3rd and the first of door
Input is connected,
The set end of first rest-set flip-flop receives the 6th comparison signal, and reset terminal receives the described 7th and compares letter
Number, output end is connected with the described 3rd with the second input of door,
Two inputs of the OR gate receive the peak value and limit signal and Time constant signal, output end and the described 3rd
It is connected with the input of the family status three,
The set end of second rest-set flip-flop is connected with the described 3rd with the output end of door, and reset terminal receives the conducting
Control signal, output end exports the switch controlling signal.
A kind of Switching Power Supply, including power stage circuit and it is above-mentioned in any one control circuit, in the power stage circuit
It is provided with main switch.
Preferably, the Switching Power Supply also includes power supply circuit, and the power supply circuit includes energy-storage travelling wave tube and to described
The charging circuit that energy-storage travelling wave tube charges,
The speed that the charging circuit charges to the energy-storage travelling wave tube becomes with the size of the output voltage of the Switching Power Supply
Change, the supply voltage of the energy-storage travelling wave tube output control circuit.
Preferably, the charging circuit includes assists winding, and the first end of the assists winding is grounded, the second end obtain with
The proportional voltage of the output voltage；
The first end ground connection of the energy-storage travelling wave tube, the second end couples with the second end of the assists winding, and exports described
Supply voltage.
Preferably, the charging circuit also includes diode and resistance, and the anode of the diode is connected to the auxiliary
Second end of winding, negative electrode connects the second end of the energy-storage travelling wave tube by the resistance.
Preferably, the Switching Power Supply also includes start-up circuit, and the DC input voitage of the power stage circuit passes through institute
Start-up circuit is stated to charge the energy-storage travelling wave tube.
Therefore, the switching power source control circuit that the application is provided is small in the first feedback signal for characterizing output voltage
During first threshold signal, mainly using the Peak Current-Mode Controlled Circuit control main switch of big peak point current, so that output
Voltage quickly increases, so as to accelerate the charging rate to partially installing capacitor so that voltage rapid increase and stabilization on partially installing capacitor
Supply voltage required for control circuit normal work, after the first feedback signal is more than first threshold signal, output voltage
Have built up, ever since using constant on-time control model control main switch, to realize the PF high in powered-down source
Performance.Additionally, the control process of peak value electric control pattern previous short time will flow through main switch electric current peak value
Set smaller, and the peak value that the electric current of main switch will be flowed through within the rear a long time sets larger, can prevent out
Powered-down source enters continuous current mode working condition.Therefore the Switching Power Supply that the application is provided is while PF performances high are realized,
It is also capable of fast starting and rapidly enter stable state, and discontinuous mode can also be always worked at.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Inventive embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 is a kind of switching power circuit structured flowchart disclosed in the embodiment of the present application；
Fig. 2 is the circuit structure diagram of Fig. 1 breaker in middle signal generating circuits；
Fig. 3 A are a kind of circuit structure diagram of output voltage detecting circuit in Fig. 2；
Fig. 3 B are a kind of circuit structure diagram of peak current limit circuit in Fig. 2；
Fig. 3 C are a kind of circuit structure diagram of constant on-time generation circuit in Fig. 2；
Fig. 3 D are a kind of circuit structure diagram of output voltage detecting circuit in Fig. 2；
Fig. 3 E are a kind of circuit structure diagram of supply voltage detection circuit in Fig. 2；
The working waveform figure of the Switching Power Supply that Fig. 4 is provided for the embodiment of the present application.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Fig. 1 is a kind of switching power circuit structured flowchart disclosed in the embodiment of the present application.
Referring to Fig. 1, Switching Power Supply disclosed in the embodiment of the present application mainly includes power stage circuit 1 and control circuit 2.Power
The topological structure of level circuit 1 can also be able to be non-isolated topological structure for isolated topological structure, such as isolated
In reverse exciting topological structure, positive activation type topological structure etc., and it is non-isolated in Buck types topological structure, Boost type opens up
Flutter structure etc..In the present embodiment, the structure of power stage circuit 1 its bag main switch Q1, includes change by taking reverse exciting topological structure as an example
Depressor T, sustained diode 1, output capacitance C1.The first end of the primary side winding L1 of transformer T receives the power stage circuit 1
DC input voitage VIN, the second end is connected with the first end of main switch Q1, and second end of main switch Q1 is couple to ground connection
End, the first end of the vice-side winding L2 of transformer T and second end of primary side winding L1 are Same Name of Ends, and with sustained diode 1
Anode is connected, and the second end ground connection, the negative electrode of diode D1 is connected with the first end of output capacitance C1, second end of output capacitance C1
Ground connection.Control circuit 2 is used for output switch control signal, to control the conducting and shut-off of main switch Q1, makes output capacitance C1
The upper output voltage VO UT for forming Switching Power Supply, the need for load.
Further, Switching Power Supply also includes power supply circuit 3 and start-up circuit 4.Power supply circuit 3 is used to be control circuit 2
Supply voltage VCC is provided, it mainly includes filling energy-storage travelling wave tube 31 and charging circuit 32.Charging circuit is used to be charged to energy-storage travelling wave tube
To form the supply voltage VCC of control circuit 2 on energy-storage travelling wave tube, and speed and the Switching Power Supply for charging output voltage VO UT
Size variation, i.e. output voltage VO UT is bigger, and charging rate is faster, and the voltage VCC on energy-storage travelling wave tube 31 can be reached quickly
And stabilize to the supply voltage needed during control 2 normal work of circuit.As shown in figure 1, in the present embodiment, energy-storage travelling wave tube 31 can
For partially installing capacitor C2, charging circuit 32 may include assists winding L3, its first end ground connection, the second end obtains and output voltage VO UT
The first end ground connection of proportional voltage VL3, partially installing capacitor C2, the second end couples with second end of assists winding L3, and the end
The supply voltage VCC of output control circuit 2.Charging circuit 32 can also further include resistance R1, diode D2, wherein resistance R1
It is connected between the negative electrode of diode D2 and second end of partially installing capacitor C2, the anode of diode D2 and the second of assists winding L3
End is connected.During diode D2 is used to prevent the energy back on partially installing capacitor C2 from flowing to assists winding L3, resistance R1 be used to making to
The charging current of partially installing capacitor C2 is more smoother.
Due to control circuit 2 before activation, Switching Power Supply Non voltage output, then assists winding L3 energy-storage travelling wave tube can not be filled
Electricity, so that control circuit 2 cannot be started, therefore Switching Power Supply also includes start-up circuit 4, is connected to the direct current of power stage circuit 2
Second end (i.e. second end of partially installing capacitor C2) of pressure input (one end of output DC input voitage VIN) with energy-storage travelling wave tube 31
Between, before control circuit 2 starts, DC input voitage VIN is charged by start-up circuit 4 to energy-storage travelling wave tube 31, when energy storage unit
Voltage on part 31 is risen to when can start control circuit 2, and control circuit 2 just can start.In the present embodiment, start-up circuit
Can be to start resistance R2, its connection is described between DC voltage input end and second end of partially installing capacitor C2, in switch electricity
In pressure after electricity, the voltage of DC voltage input end is charged by resistance R2 to partially installing capacitor C2, so that the voltage VCC on C2 increases
Plus, when the value of voltage VCC is up to the startup required voltage for controlling circuit 2, control circuit 2 starts to start.
In this application, control circuit 2 includes：Voltage feedback circuit 21, current feedback circuit 22 and switching signal are produced
Circuit 23.Wherein switching signal produces circuit 23, for being produced according to the first feedback signal VSEN and the second feedback signal VISEN
The switch controlling signal VG of main switch Q1.
Voltage feedback circuit 21 is used to obtain the first feedback signal VSEN for characterizing output voltage VO UT, and it can use existing
Any circuit realiration for being capable of sampling and outputting voltage signal, such as in the present embodiment by being connected to assists winding L3 in turn
The second end and earth terminal between divider resistance R2, R3 may make up voltage feedback circuit 21, the node that resistance R2 is connected with R3
Place exports the branch pressure voltage of voltage VL3 at second end of assists winding L3, then branch pressure voltage VSEN is sign output voltage
The first feedback signal VSEN of VOUT, itself and output voltage VO UT proportion relations certainly also can directly by output voltage
VOUT exports the first feedback signal VSEN for characterizing output voltage VO UT after resistor voltage divider circuit.
Current feedback circuit 22, the second feedback signal VISEN of the electric current for flowing through main switch Q1 is characterized for obtaining, its
The specific implementation of circuit can be by existing any circuit realiration that can realize current sampling signal, such as in the application
In, sampling is connected to the resistance R4 between second end of main switch Q1 and earth terminal to realize current feedback circuit 22.Resistance
Voltage and the current in proportion for flowing through main switch Q1 on R4, therefore can be used as characterizing the of the electric current for flowing through main switch Q1
Two feedback signal VISEN.
As shown in Fig. 2 it is the circuit structure diagram of Fig. 1 breaker in middle signal generating circuits, switching signal produces circuit 23 to wrap
Include：Output voltage detecting circuit 231, peak current limit circuit 232 and constant on-time produce circuit 233, can also enter one
Step includes that supply voltage detects circuit 234 and logic circuit 235.
Output voltage detecting circuit 231 is used to judge the size of the first feedback signal VSEN and first threshold signal VREF1
Relation, and export detection signal VD1.The output end phase of peak current limit circuit 232 and output voltage detecting circuit 231
Even, for indicating the first feedback signal VSEN to be less than the first threshold signal VREF1 phases in output detection signal VD1
Between, the peak value of the second feedback signal VISEN is limited, and limited peak value is reached in the second feedback signal VISEN
When export effective peak value and limit signal IPK, to control the main switch Q1 to turn off.Constant on-time produces circuit 233
Output end with output voltage detecting circuit 231 is connected, for indicating the first feedback signal VSEN big in output detection signal VD1
During the first threshold signal VREF1, the ON time of main switch Q1 is controlled for a Time constant, and in main switch
The ON time of Q1 exports effective Time constant signal TON when reaching the Time constant, to control main switch Q1 to turn off.
As can be seen here, circuit 2 is controlled when the first feedback signal VSEN is less than the first threshold signal VREF1, with Peak Current Mode
The conducting and shut-off of formula control main switch Q1, when the first feedback signal VSEN is more than the first threshold signal VREF1, with perseverance
Determine the conducting and shut-off of ON time control model control main switch Q1.
Supply voltage detect circuit 234, for detect it is described control circuit supply voltage VCC and the first reference voltage,
The magnitude relationship of the second reference voltage and tertiary voltage, and power supply detection signal VD12 is exported, make the control circuit 2 in institute
State and started working when supply voltage reaches second reference voltage, the supply voltage VCC more than the first reference voltage or
The main switch Q1 is controlled to turn off always during less than the 3rd reference voltage, wherein, first reference signal is more than described
Second reference signal, second reference signal is more than the 3rd reference signal.
Logic circuit 234 be used to receiving peak value limit signal IPK, Time constant signal TON, power supply detection signal VD12 with
And conductivity control signal VS, and output switch pipe Q1 switch controlling signal VG.Switch controlling signal VG is also fed back to constant
Turn-on time generation circuit 233, Time constant signal TON is produced with according to it.Powered when supply voltage detection signal VD2 is characterized
When voltage VCC reaches the second reference voltage, control circuit 2 is started working, and the output main switch Q1's of the logic circuit 235 opens
Control signal is closed, this process is specially：When conductivity control signal VS is effective, switch controlling signal VG controls main switch Q1 leads
It is logical, when any one in peak value restriction signal IPK and Time constant signal TON is effective, switch controlling signal VG control masters
Switching tube Q1 is turned off.Wherein conductivity control signal VS is the signal for triggering main switch Q1 conductings, and it can be obtained by prior art
, for example it is the zero passage detection signal (effective in inductive current zero crossing) of the Switching Power Supply or is alternatively outside one
Portion's clock signal, can also be the signal produced with desired output voltage according to the actual output voltage of Switching Power Supply, work as reality
When border output voltage is less than desired output voltage, effective conductivity control signal VS is exported, to trigger main switch Q1 conductings.When
When supply voltage detection signal VD2 characterizes supply voltage VCC more than the first reference voltage or less than three reference voltages, control
Circuit is not worked, or the switch controlling signal VG controls main switch Q1 of the output of logic circuit 235 is turned off always.At one preferably
In implementation, can make the first reference voltage be control circuit 2 overvoltage threshold voltage, its value can it is default be set to 25~35V,
Such as 30V, the second reference voltage starts threshold voltage for control circuit 2；Its value is predeterminable to be set to 20~30V, such as 25V,
The value of three reference voltages may be set to the minimum supply voltage for controlling the normal work of circuit 2 to need, and such setting makes power supply electricity
The voltage range of the assists winding L3 in road 3 becomes big, therefore, as shown in figure 1, need not additionally set voltage stabilizing electricity in power supply circuit 4
Road (is arranged between resistance R5 and energy-storage travelling wave tube 3) in the prior art, can also control the circuit also can be just under fully loaded even semi-load
Often work, reduces the component of Switching Power Supply, has saved manufacturing cost.
Therefore, during the first feedback signal for characterizing output voltage is less than first threshold signal, show output electricity
The value that pressure does not set up also and is maintained needed for loading, i.e. output voltage values during this are relatively low, and the voltage on partially installing capacitor increases
Plus speed it is slower, it is therefore desirable to the conducting of main switch and shut-off are controlled using Peak Current-Mode Controlled Circuit, so that can be by the
The peak value of two feedback signal VISEN is defined to larger value, to accelerate gathering way for output voltage, and then can make partially installing capacitor
On voltage quickly rise, when reaching first threshold signal to the first feedback signal, show output voltage to set up load
Required value, the voltage on partially installing capacitor now has risen to the supply voltage required for controlling circuit normal work, and can one
The value is directly maintained, main switch turn-on and turn-off are just hereafter controlled with constant conduction control model, enter Switching Power Supply steady
State working condition, to realize PF high (power factor (PF)) performance of Switching Power Supply.
Further, in the present embodiment, output voltage detecting circuit 231 be additionally operable to judge the first feedback signal VSEN with
The magnitude relationship of Second Threshold signal VREF2, wherein Second Threshold signal VREF2 are less than first threshold signal VREF1, then export
The output of voltage detecting circuit 231 detection signal VD1 may further indicate that the first feedback signal VSEN is big with Second Threshold signal VREF2
It is small.Therefore output detection signal VD1 may indicate that the first feedback signal VSEN is less than Second Threshold signal VREF2, the first feedback letter
Number VSEN is more than the first threshold more than Second Threshold signal VREF2 and less than first threshold signal VREF1, the first feedback signal VSEN
Value signal VREF1 these three states.As shown in Figure 3A, it is a kind of circuit structure diagram of output voltage detecting circuit in Fig. 2, defeated
Going out voltage detecting circuit 231 can be realized by first comparator CP1, the second comparator CP2.First comparator CP1's is defeated
Enter end and receive the first feedback signal VSEN and first threshold signal VREF1 respectively, compared with comparing the two signals, and exporting first
Compared with signal V1.The input of the second comparator CP2 receives the first feedback signal VSEN and Second Threshold signal VREF2 respectively, with
Compare the two signals, and export the second comparison signal V2.First comparison signal V1 and the second comparison signal V2, mono- piece of composition is defeated
Go out detection signal VD1.
Peak current limit circuit 232 indicates the first feedback signal VSEN to be less than Second Threshold in output detection signal VD1
During signal VREF2, the peak value of the second feedback signal VISEN is defined to the 3rd threshold signal VREF3, in output detection signal
VD1 indicate the first feedback signal VSEN less than Second Threshold signal VREF2 and more than first threshold signal VREF1 during, by the
The peak value of two feedback signal VISEN is defined to the 4th threshold signal VREF4, wherein, the 3rd threshold signal VREF3 is less than the 4th threshold
Value signal VREF4.As shown in Figure 3 B, it includes first switch to a kind of circuit structure diagram of peak current limit circuit 232 in Fig. 2
S1, second switch S2, the 3rd comparator CP3, the first phase inverter N1 and first and door AND1,
The first end of first switch S1 receives the 3rd threshold signal VREF3, the second end and the 3rd comparator CP3
First input end (such as inverting input "-") be connected, switch control terminal receive and the second comparison signal V2 state phases
Anti- signal, as illustrated, the signal can be signals of the second comparison signal V2 by output after a phase inverter.Second switch
The first end of S2 receives the 4th threshold signal VREF4, the first input end phase of the second end and the 3rd comparator CP3
Even, switch control terminal receives the second comparison signal V2, and second input of the 3rd comparator CP3 is (such as with mutually defeated
Enter to hold "+") receive the second feedback signal VISEN, output end to described first with the first input end output of door AND1 the
The input of three comparison signal V3, the first phase inverter N1 receives the first comparison signal V1, described first and door AND1
The second input receive the output signal of the first phase inverter N1, output end exports the peak value and limits signal IPK.Its
In, the 3rd threshold signal VREF3, the 4th threshold signal VREF4 can be provided by voltage source U1, U2 respectively in the present embodiment, then
The first end of first switch S1 is connected with the output end of voltage source U1, the first end of second switch S2 and the output end of voltage source U2
It is connected.
Fig. 3 C are a kind of circuit structure diagram of constant on-time generation circuit in Fig. 2.In the present embodiment, Time constant
Producing circuit 233 includes charging capacitor C3, charging control switch S3, charging current source A0, the 4th comparison circuit CP4 and second
With door AND2, respective annexation is as shown in Figure 3 C；When the main switch Q1 is logical, the charging control switch S3 is closed
Disconnected, the charging current source A0 is charged to the charging capacitor C3, and when the main switch Q1 is turned off, the charge control is opened
Close S3 conducting, the charging capacitor C3 by the charging control switch S3 electric discharge, therefore charging control switch S3 switch shape
State can be controlled by the non-signal of switch controlling signal VG.The 4th comparator CP4, first input end (such as homophase input
End "+") voltage on the charging capacitor C3 is received, the second input (such as inverting input "-") is received and characterizes the perseverance
The reference voltage V REF0 for fixing time, and the 4th comparison signal V4 is exported with the first input end of door AND2 to described second, it is described
Second receives the first comparison signal V1 with second input of door AND2, and output end exports the Time constant signal TON.
Therefore, constant on-time produces circuit 233, is only more than the first threshold signal in the first feedback signal VSEN
During VREF1, second could control the ON time of the main switch Q1 for a Time constant, and in the main switch Q1
ON time export effective Time constant signal TON when reaching the Time constant, to control the main switch Q1 to close
It is disconnected, so as to make Switching Power Supply enter constant on-time control model after output voltage foundation, to obtain PF performances higher.
As shown in Figure 3 D, the embodiment of the present application gives a kind of a kind of realization of supply voltage detection circuit 234 in Fig. 2
Circuit structure diagram, the circuit includes the 5th comparator CP5, the 6th comparator CP6 and the 7th comparator CP7, the 5th ratio
It is used to compare the supply voltage VCC and the size of the first reference voltage VCC_OVP compared with device CP5, and exports the 5th and compares
Signal V5, the 6th comparator CP6 are big with the second reference voltage VCC_ON for comparing the supply voltage VCC
It is small, and the 6th comparison signal V6 is exported, the 7th comparator CP7 is used to compare the supply voltage VCC with the 3rd ginseng
Examine the size of voltage VCC_OFF, and export the 7th comparison signal V7, the 5th comparison signal V5, the 6th comparison signal V6 with
And the 7th comparison signal V7 collectively as the power supply detection signal VD2.Wherein, the first reference signal VCC_OVP can be by power supply
U3 is provided, and the second reference signal VCC_ON can be provided by power supply U4, and the 3rd reference signal VCC_OFF can be provided by power supply U5.
As shown in FIGURE 3 E, the embodiment of the present application gives one kind of logic circuit 235 in Fig. 2 a kind of and realizes circuit structure
Figure, the circuit includes the first rest-set flip-flop RS1, the second phase inverter N2, OR gate OR, the 3rd and door AND3 and the second rest-set flip-flop
The input of RS2, the second phase inverter NQ receives the 5th comparison signal V5, and output end is with the described 3rd and door AND3's
First input end is connected, and the set end of the first rest-set flip-flop RS1 receives the 6th comparison signal V6, and reset terminal receives institute
The 7th comparison signal V7 is stated, output end is connected with the described 3rd with second input of door AND3, two inputs of the OR gate OR
End receives the peak value and limits signal IPK and Time constant signal TON, output end and the described 3rd and the inputs of door AND3 the 3rd
It is connected, the set end of the second rest-set flip-flop RS2 is connected with the described 3rd with the output end of door AND3, reset terminal receives described
Conductivity control signal VS, output end exports the switch controlling signal VG.In the present embodiment, conductivity control signal VS may be selected
It is the zero passage detection signal ZX of Switching Power Supply.
Therefore, control circuit 2 starts to start work when supply voltage VCC reaches the second reference signal VCC_ON,
And, if supply voltage VCC is in the first reference signal VCC_OVP and the 3rd reference signal VCC_OFF. in control circuit 2 upon actuation
Between when, the first feedback signal VSEN be less than the first threshold signal VREF1 during, i.e., with Peak Current-Mode Controlled Circuit control
During main switch processed, and the peak value of the second feedback signal VISEN is first defined to less value, to prevent Switching Power Supply from entering
Continuous current mode mode of operation, such setting, in output short-circuit, the first feedback signal VSEN is very small, the second feedback
The peak value of signal VISEN is defined as the 3rd threshold signal VREF3 of smaller value, is conducive to reducing the short-circuit work(of Switching Power Supply
Consumption, is then defined to larger value by the peak value of the second feedback signal VISEN again, so that the supply voltage of control circuit 2 is quick
Its normal work required voltage must be risen to and be maintained, first threshold signal VREF1 is more than in the first feedback signal VSEN
Period, control the supply voltage of circuit 2 to stabilize to required voltage, the control mode switch of Switching Power Supply is led for constant
Logical control model, to improve the PF performances high of Switching Power Supply.
The working waveform figure of the Switching Power Supply that Fig. 4 is provided for the embodiment of the present application.
Referring to Fig. 4, to analyze the course of work of the Switching Power Supply in the application with also enough while PF types energy high is realized
The quick principle for starting and entering steady operation.At the t0 moment, Switching Power Supply just goes up electricity, and DC input voitage VIN is by opening
Dynamic resistance R1 charges to partially installing capacitor C2, increases the voltage VCC on partially installing capacitor C2, now due to no output voltage, the
One feedback signal VSEN and the second feedback signal VISEN are zero.To the t1 moment, the value of voltage VCC reaches the second reference voltage
VCC_ON, control circuit 2 starts to start work, and output voltage VO UT starts by zero increase, then the first feedback signal VSEN is also opened
Begin to increase, because now, control circuit can extract substantial amounts of electric current to start work from partially installing capacitor C2, and now export
Voltage is not yet set up, and power supply circuit charges to partially installing capacitor C2 makes the value of its voltage rising to make up because of control circuit draws
Electric current causes the value that the voltage VCC on partially installing capacitor C2 can decline, thus voltage on partially installing capacitor generally speaking can always under
Drop, it is therefore desirable to control main switch using Peak Current-Mode Controlled Circuit, by rational parameter setting, improves output capacitance C1
The upper increased speed of voltage, i.e., increase quickly output voltage, to accelerate power supply circuit to partially installing capacitor C2 charging rates, makes
The voltage VCC obtained on partially installing capacitor C2 gos up.But in order to prevent Switching Power Supply from entering continuous current mode mode of operation, now
The peak value of the second feedback signal VISEN first can be limited to a less 3rd threshold signal VREF3 of value.When t2
Carve, the first feedback signal VSEN increases to Second Threshold signal VREF2, even if showing hereafter to increase the peak value of the second feedback signal
Also Switching Power Supply will not be made to enter continuous current mode working condition, therefore now, the peak value of the second feedback signal VISEN is limited
A the 4th larger threshold signal VREF4 of value is made as, so that output voltage VO UT is increased rapidly to the t3 moment, first is anti-
Feedback signal VSEN increases to first threshold signal VREF1, it has been increased rapidly to control to the voltage VCC on partially installing capacitor C2 is made
The supply voltage of the normal work of circuit 2 needs simultaneously can always be maintained the voltage, hereafter control to lead with constant conduction control model
The state of switching tube Q1, to improve the PF performances of Switching Power Supply.If controlling the supply voltage VCC of circuit to be more than the first reference voltage
VCC_OVP or during less than the 3rd reference voltage VCC_OFF, control circuit 2 no longer work or, the switch controlling signal VG of output
Control main switch Q1 is turned off always, to realize overvoltage or under-voltage protection to control circuit.
Therefore, the switching power source control circuit that the application is provided is small in the first feedback signal for characterizing output voltage
During first threshold signal, mainly using the Peak Current-Mode Controlled Circuit control main switch of big peak point current, so that output
Voltage quickly increases, so as to accelerate the charging rate to partially installing capacitor so that voltage rapid increase and stabilization on partially installing capacitor
Supply voltage required for control circuit normal work, after the first feedback signal is more than first threshold signal, output voltage
Have built up, ever since using constant on-time control model control main switch, to realize the PF high in powered-down source
Performance.Additionally, the control process of peak value electric control pattern previous short time will flow through main switch electric current peak value
Set smaller, and the peak value that the electric current of main switch will be flowed through within the rear a long time sets larger, can prevent out
Powered-down source enters continuous current mode working condition.Therefore the Switching Power Supply that the application is provided is while PF performances high are realized,
It is also capable of fast starting and rapidly enter stable state, and discontinuous mode can be always worked at.
The principle and obtained effect that above-mentioned control method is realized are set forth in the application other embodiments,
Do not make an explanation further herein, in addition the first feedback signal, the second feedback signal, the first threshold in each embodiment of the application
Value signal, Second Threshold signal, the 3rd threshold signal that is, the 4th threshold signal can also can be believed for voltage signal for electric current
Number, and signal effectively makes finger signal be in effective status in this application, and effective status is high level, but in other implementations
In can also be low level.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or uses the present invention.
Various 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, the present 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 scope most wide for causing.
Claims (13)
1. a kind of control circuit of Switching Power Supply, is provided with main switch in the Switching Power Supply, and the control circuit includes：
Voltage feedback circuit, the first feedback signal for obtaining the output voltage for characterizing the Switching Power Supply；
Output voltage detecting circuit, the magnitude relationship for detecting first feedback signal and first threshold signal；
Current feedback circuit, the second feedback signal of the electric current for flowing through the main switch is characterized for obtaining；
Peak current limit circuit, it is described for during first feedback signal is less than the first threshold signal, limiting
The peak value of the second feedback signal, and effective peak value restriction letter is exported when second feedback signal reaches limited peak value
Number, to control the main switch to turn off；
Constant on-time produces circuit, for during first feedback signal is more than the first threshold signal, controlling
The ON time of the main switch is a Time constant, and ON time in the main switch reaches the Time constant
When export effective Time constant signal, to control the main switch to turn off；
The output voltage detecting circuit is additionally operable to the magnitude relationship of detection first feedback signal and Second Threshold signal, institute
Second Threshold signal is stated less than the first threshold signal；
The peak current limit circuit first feedback signal be less than the Second Threshold signal during, by described second
The peak value of feedback signal is defined to the 3rd threshold signal, is more than the Second Threshold signal in first feedback signal and is less than
During the first threshold signal, the peak value of second feedback signal is defined to the 4th threshold signal；
Wherein, the 3rd threshold signal is less than the 4th threshold signal.
2. control circuit according to claim 1, it is characterised in that also circuit is detected including supply voltage, for detecting
The supply voltage of the control circuit and the magnitude relationship of the first reference voltage, the second reference voltage and the 3rd reference voltage,
And power supply detection signal is exported, the control circuit is started work when the supply voltage reaches second reference voltage
Make, control the main switch to close always during the supply voltage is more than the first reference voltage or less than the 3rd reference voltage
It is disconnected,
Wherein, first reference voltage is more than second reference voltage, and second reference voltage is more than the described 3rd ginseng
Examine voltage.
3. control circuit according to claim 2, it is characterised in that also including logic circuit, for receiving the peak value
Signal, Time constant signal, power supply detection signal and conductivity control signal are limited, and exports the switch control of the main switch
Signal processed, wherein the conductivity control signal is the signal of the triggering main switch conducting.
4. control circuit according to claim 1, it is characterised in that the output voltage detecting circuit compares including first
Device and the second comparator, the first comparator are used to comparing first feedback signal and first threshold signal, and export the
One comparison signal, second comparator is used to compare first feedback signal and the Second Threshold signal, and exports the
Two comparison signals.
5. control circuit according to claim 4, it is characterised in that the peak current limit circuit is opened including first
Pass, second switch, the 3rd comparator, the first phase inverter and first and door,
The first end of the first switch receives the 3rd threshold signal, and the second end is input into the first of the 3rd comparator
End is connected, and switch control terminal receives the signal opposite with the second comparison signal state,
The first end of the second switch receives the 4th threshold signal, and the second end is input into the first of the 3rd comparator
End is connected, and switch control terminal receives second comparison signal,
Second input of the 3rd comparator receives second feedback signal, and output end is to described first and the first of door
Input is input into the 3rd comparison signal,
The input of first phase inverter receives first comparison signal, and described first receives institute with the second input of door
The output signal of the first phase inverter is stated, output end exports the peak value and limits signal.
6. control circuit according to claim 4, it is characterised in that the constant on-time produces the circuit to include charging
Electric capacity, charging control switch, charging current source, the 4th comparator and second and door；
When the main switch is turned on, the charging control switch shut-off, the charging current source fills to the charging capacitor
Electricity, when the main switch is turned off, the charging control switch conducting, the charging capacitor passes through the charging control switch
Electric discharge,
The first input end of the 4th comparator receives the voltage on the charging capacitor, and it is described that the second input receives sign
The reference voltage of Time constant, and the 4th comparison signal is exported with the first input end of door to described second, described second and door
The second input receive first comparison signal, output end exports the Time constant signal.
7. control circuit according to claim 3, it is characterised in that the supply voltage detection circuit compares including the 5th
Device, the 6th comparator and the 7th comparator,
5th comparator is used to compare the supply voltage and the size of first reference voltage, and output the 5th is compared
Signal,
6th comparator is used to compare the supply voltage and the size of second reference voltage, and output the 6th is compared
Signal,
7th comparator is used to compare the supply voltage and the size of the 3rd reference voltage, and output the 7th is compared
Signal,
5th comparison signal, the 6th comparison signal and the 7th comparison signal are collectively as the power supply detection signal.
8. control circuit according to claim 7, it is characterised in that the logic circuit includes the first rest-set flip-flop, the
Two phase inverters, OR gate, the 3rd and door and the second rest-set flip-flop,
The input of second phase inverter receives the 5th comparison signal, and output end is input into the described 3rd with the first of door
End is connected,
The set end of first rest-set flip-flop receives the 6th comparison signal, and reset terminal receives the 7th comparison signal,
Output end is connected with the described 3rd with the second input of door,
Two inputs of the OR gate receive the peak value and limit signal and Time constant signal, output end and the described 3rd and door
3rd input is connected,
The set end of second rest-set flip-flop is connected with the described 3rd with the output end of door, and reset terminal receives the conducting control
Signal, output end exports the switch controlling signal.
9. a kind of Switching Power Supply, including any one described control circuit, the work(in power stage circuit and claim 1 to 8
Main switch is provided with rate level circuit.
10. Switching Power Supply according to claim 9, it is characterised in that also including power supply circuit, the power supply circuit includes
Energy-storage travelling wave tube and the charging circuit charged to the energy-storage travelling wave tube,
The speed that the charging circuit charges to the energy-storage travelling wave tube with the output voltage of the Switching Power Supply size variation, institute
State the supply voltage of the energy-storage travelling wave tube output control circuit.
11. Switching Power Supplies according to claim 10, it is characterised in that the charging circuit includes assists winding, described
The first end ground connection of assists winding, the second end obtains the voltage proportional to the output voltage；
The first end ground connection of the energy-storage travelling wave tube, the second end couples with the second end of the assists winding, and exports the power supply
Voltage.
12. Switching Power Supplies according to claim 11, it is characterised in that the charging circuit also includes diode and electricity
Resistance, the anode of the diode is connected to the second end of the assists winding, and negative electrode connects the energy storage unit by the resistance
Second end of part.
13. Switching Power Supplies according to claim 9, it is characterised in that also including start-up circuit, the power stage circuit
DC input voitage is charged by the start-up circuit to energy-storage travelling wave tube.
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| CN201410852628.4A CN104578800B (en) | 2014-12-31 | 2014-12-31 | Control circuit of switch power supply and switch power supply provided with control circuit |
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| CN201410852628.4A CN104578800B (en) | 2014-12-31 | 2014-12-31 | Control circuit of switch power supply and switch power supply provided with control circuit |
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| CN106341038A (en) * | 2015-05-22 | 2017-01-18 | 无锡矽瑞微电子股份有限公司 | Constant voltage output switching power supply device with high power factor and control method thereof |
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| CN107943198B (en) * | 2017-12-26 | 2024-03-15 | 上海新进芯微电子有限公司 | Detection circuit of switch voltage output current and switch power supply system |
| KR102301218B1 (en) * | 2018-01-30 | 2021-09-10 | 주식회사 엘지에너지솔루션 | Apparatus for diagnosing relay drive circuit |
| DE102018104621A1 (en) * | 2018-02-28 | 2019-08-29 | Infineon Technologies Ag | A method of operating a transistor device and electronic circuit having a transistor device |
| CN109120139A (en) * | 2018-09-28 | 2019-01-01 | 杰华特微电子（杭州）有限公司 | A kind of switching power source control circuit and method and Switching Power Supply |
| CN109256942B (en) * | 2018-11-01 | 2020-03-31 | 电子科技大学 | Self-adaptive starting circuit suitable for primary side feedback flyback converter |
| CN109586598A (en) * | 2018-12-29 | 2019-04-05 | 杰华特微电子（杭州）有限公司 | A kind of power supply circuit, control circuit and Switching Power Supply |
| CN112397016B (en) * | 2019-08-16 | 2022-02-22 | 华润微集成电路(无锡)有限公司 | Line voltage compensation circuit and compensation method thereof |
| CN112018860B (en) * | 2020-08-13 | 2023-02-10 | 成都芯源系统有限公司 | Circuit and method for setting a supply voltage in a power supply system |
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Address after: 310051 No. 6 Lianhui Street, Xixing Street, Binjiang District, Hangzhou City, Zhejiang Province Patentee after: Silergy Semiconductor Technology (Hangzhou ) Co., Ltd. Address before: 310012 Xihu District, Hangzhou, Wensanlu Road, No. 90, East Software Park, science and technology building, A1501 Patentee before: Silergy Semiconductor Technology (Hangzhou ) Co., Ltd. |