CN104578800A - 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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- CN104578800A CN104578800A CN201410852628.4A CN201410852628A CN104578800A CN 104578800 A CN104578800 A CN 104578800A CN 201410852628 A CN201410852628 A CN 201410852628A CN 104578800 A CN104578800 A CN 104578800A
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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 technology, be specifically related to the control circuit of Switching Power Supply and the Switching Power Supply with this circuit.
Background technology
Switching Power Supply generally comprises power stage circuit, control circuit, power supply circuits and starting resistance.After Switching Power Supply powers on, the input direct voltage inputing to power stage circuit is that partially installing capacitor in power supply circuits charges by starting resistance, when the voltage on partially installing capacitor reaches the starting resistor of control circuit, control circuit starts to start, because control circuit starts to start work, the Nodes that control circuit internal circuit can be connected from starting resistance with partially installing capacitor extracts a large amount of electric currents, voltage on partially installing capacitor can drop, power supply circuits charge to its partially installing capacitor according to the output voltage size of Switching Power Supply subsequently, voltage on partially installing capacitor is slowly gone up and is maintained the supply power voltage of the normal need of work of control circuit, control circuit is with the switch motion of the main switch of certain control model control switch power supply, thus make Switching Power Supply export the voltage meeting loading demand.
The Switching Power Supply that constant on-time control model controls, because scheme realizes simple, cost is lower, and stability is better and be widely used.But when adopting this constant on-time control model to control to realize Switching Power Supply, when inputting to prevent voltage, output current there will be the phenomenon of overshoot, usually can the constant on-time of main switch in Switching Power Supply be preset smaller, cause the slow-footed problem of control loop, the output voltage of Switching Power Supply is made to reach the time required for loading demand voltage elongated, namely output voltage to set up speed slower, then the power supply circuits speed of charging to partially installing capacitor is also slower, , the voltage on partially installing capacitor is made after control circuit starts, to need the longer time slowly to go up and be maintained control circuit normally to work required supply power voltage.Therefore, be supply power voltage in order to the voltage stabilization on partially installing capacitor can be made fast, the capacitance of partially installing capacitor needs the larger of setting usually, make the speed of the voltage of partially installing capacitor drop after control circuit starts slower, but excessive partially installing capacitor can make again the voltage rise on partially installing capacitor to the time lengthening of the starting resistor of control circuit, reduce the toggle speed of control circuit, finally still Switching Power Supply can not be made to enter steady operation fast.
In order to solve the problem, a kind of way of prior art adopts less starting resistance, to accelerate the toggle speed of control circuit.The another kind of way of prior art arranges high-voltage tube in control circuit inside, after Switching Power Supply powers on, this high-voltage tube of conducting, makes the direct voltage inputed in the power stage circuit of Switching Power Supply provide starting resistor by this high-voltage tube to control circuit, control circuit capable of fast starting.But front a kind of prior art owing to needing little starting resistance to switch to large resistance after control circuit starts, and need the peripheral components that extra increase is more, cost is high, and institute takes up space large; Although rear a kind of prior art can reduce peripheral components, because needs are at the inner integrated high voltage pipe of control chip, manufacturing cost and technology difficulty can be increased.In addition, existing two kinds of technology all only accelerate the toggle speed of control circuit, and output voltage can not be solved further set up slow-footed problem, therefore can not improve in the Switching Power Supply adopting constant conduction control model to control, for control circuit is powered slow-footed problem, Switching Power Supply still can not enter steady-working state fast.
Summary 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 this circuit with solve in existing Switching Power Supply especially adopt constant conduction control model to control Switching Power Supply in, because speed of powering for control circuit is slow and make Switching Power Supply enter the slow problem of steady state speed.
A control circuit for Switching Power Supply, is provided with main switch in described Switching Power Supply, and described control circuit comprises:
Voltage feedback circuit, for obtaining the first feedback signal of the output voltage characterizing described Switching Power Supply;
Output voltage detecting circuit, for detecting the magnitude relationship of described first feedback signal and first threshold signal;
Current feedback circuit, for obtaining the second feedback signal characterizing and flow through the electric current of described main switch;
Peak current limit circuit, during being less than described first threshold signal in described first feedback signal, limit the peak value of described second feedback signal, and export effective peak value restriction signal when described second feedback signal reaches limited peak value, turn off to control described main switch;
Constant on-time produces circuit, during being greater than described first threshold signal in described first feedback signal, the ON time controlling described main switch is a Time constant, and effective Time constant signal is exported when the ON time of described main switch reaches described Time constant, turn off to control described main switch.
Preferably, described control circuit also comprises supply power voltage testing circuit, for the magnitude relationship of the supply power voltage and the first reference voltage, the second reference voltage and tertiary voltage that detect described control circuit, and export for power detection signal, described control circuit is started working when described supply power voltage reaches described second reference voltage, during described supply power voltage is greater than the first reference voltage or is less than the 3rd reference voltage, control described main switch turn off always
Wherein, described first reference signal is greater than described second reference signal, and described second reference signal is greater than described 3rd reference signal.
Preferably, described control circuit is bag logical circuit also, limit signal, Time constant signal for receiving described peak value, supply power detection signal and conductivity control signal, and exporting the switch controlling signal of described main switch, wherein said conductivity control signal is the signal triggering described main switch conducting.
Preferably, described output voltage detecting circuit is also for detecting the magnitude relationship of described first feedback signal and Second Threshold signal, and described Second Threshold signal is less than described first threshold signal;
Described peak current limit circuit is during described first feedback signal is less than described Second Threshold signal, the peak value of described second feedback signal is defined as the 3rd threshold signal, during described first feedback signal is greater than described Second Threshold signal and is less than described first threshold signal, the peak value of described second feedback signal is defined as the 4th threshold signal;
Wherein, described 3rd threshold signal is less than described 4th threshold signal.
Preferably, described output voltage detecting circuit comprises the first comparator and the second comparator, described first comparator is used for more described first feedback signal and first threshold signal, and export the first comparison signal, described second comparator is used for more described first feedback signal and described Second Threshold signal, and exports the second comparison signal.
Preferably, described peak current limit circuit comprises the first switch, second switch, the 3rd comparator, the first inverter and first and door,
The first end of described first switch receives described 3rd threshold signal, and the second end is connected with the first input end of described 3rd comparator, and switch control terminal receives the signal contrary with described second comparison signal state.
The first end of described second switch receives described 4th threshold signal, and the second end is connected with the first input end of described 3rd comparator, and switch control terminal receives described second comparison signal,
Second input of described 3rd comparator receives described second feedback signal, and output exports the 3rd comparison signal to described first and the first input end of door,
The input of described first inverter receives described first comparison signal, and described first receives the output signal of described first inverter with the second input of door, and output exports described peak value and limits signal.
Preferably, described constant on-time produces circuit and comprises charging capacitor, charging control switch, charging current source, the 4th comparator and second and door;
When described main switch conducting, described charging control switch turns off, and described charging current source gives the charging of described charging capacitor, when described main switch turns off, and described charging control switch conducting, described charging capacitor is discharged by described charging control switch,
The first input end of described 4th comparator receives the voltage on described charging capacitor, second input receives the reference voltage characterizing described Time constant, and export the 4th comparison signal to described second and the first input end of door, described second receives described first comparison signal with the second input of door, and output exports described Time constant signal.
Preferably, described supply power voltage testing circuit comprises the 5th comparator, the 6th comparator and the 7th comparator,
Described 5th comparator is used for the size of more described supply power voltage and described first reference voltage, and exports the 5th comparison signal,
Described 6th comparator is used for the size of more described supply power voltage and described second reference voltage, and exports the 6th comparison signal,
Described 7th comparator is used for the size of more described supply power voltage and described 3rd reference voltage, and exports the 7th comparison signal,
Described 5th comparison signal, the 6th comparison signal and the 7th comparison signal supply power detection signal as described jointly.
Preferably, described logical circuit comprise the first rest-set flip-flop, the second inverter or door, the 3rd with door and the second rest-set flip-flop,
The input of described first inverter receives described 5th comparison signal, and output is connected with the first input end of door with the described 3rd,
The set termination of described first rest-set flip-flop receives described 6th comparison signal, and reset terminal receives described 7th comparison signal, and output is connected with the second input of door with the described 3rd,
Two inputs that are described or door receive described peak value and limit signal and Time constant signal, and output is connected with the family status three input with the described 3rd,
The set end of described second rest-set flip-flop is connected with the output of door with the described 3rd, and reset terminal receives described conductivity control signal, and output exports described switch controlling signal.
A kind of Switching Power Supply, comprise power stage circuit and above-mentioned in any one control circuit, be provided with main switch in described power stage circuit.
Preferably, described Switching Power Supply also comprises power supply circuits, the charging circuit that described power supply circuits comprise energy-storage travelling wave tube and charge to described energy-storage travelling wave tube,
The speed that described charging circuit charges to described energy-storage travelling wave tube is with the size variation of the output voltage of described Switching Power Supply, and described energy-storage travelling wave tube exports the supply power voltage of described control circuit.
Preferably, described charging circuit comprises auxiliary winding, the first end ground connection of described auxiliary winding, and the second end obtains the voltage proportional with described output voltage;
The first end ground connection of described energy-storage travelling wave tube, the second end of the second end and described auxiliary winding couples, and exports described supply power voltage.
Preferably, described charging circuit also comprises diode and resistance, and the anode of described diode is connected to the second end of described auxiliary winding, and negative electrode connects the second end of described energy-storage travelling wave tube by described resistance.
Preferably, described Switching Power Supply also comprises start-up circuit, and the DC input voitage of described power stage circuit is charged to described energy-storage travelling wave tube by described start-up circuit.
Therefore, the switching power source control circuit that the application provides, during the first feedback signal characterizing output voltage is less than first threshold signal, the Peak Current-Mode Controlled Circuit of the large peak current of main employing controls main switch, increase fast to make output voltage, thus the charging rate accelerated partially installing capacitor, make the voltage on partially installing capacitor increase fast and stabilize to control circuit normally to work required supply power voltage, after the first feedback signal is greater than first threshold signal, output voltage is set up, constant on-time control model is adopted to control main switch ever since, to realize the high PF performance of closing power supply.In addition, at the last short time of the control procedure of peak electricity control model, the peak value of the electric current flowing through main switch is arranged smaller, and within the rear a long time, the peak value of the electric current flowing through main switch is arranged larger, can prevent Switching Power Supply from entering continuous current mode operating state.Therefore the Switching Power Supply that provides of the application is while realizing high PF performance, also capable of fast starting and enter stable state fast, and can also be operated in discontinous mode always.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
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 circuit;
Fig. 3 A is a kind of circuit structure diagram of output voltage detecting circuit in Fig. 2;
Fig. 3 B is a kind of circuit structure diagram of peak current limit circuit in Fig. 2;
Fig. 3 C is a kind of circuit structure diagram that in Fig. 2, constant on-time produces circuit;
Fig. 3 D is a kind of circuit structure diagram of output voltage detecting circuit in Fig. 2;
Fig. 3 E is a kind of circuit structure diagram of supply power voltage testing circuit in Fig. 2;
The working waveform figure of the Switching Power Supply that Fig. 4 provides for the embodiment of the present application.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong 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.
See Fig. 1, Switching Power Supply disclosed in the embodiment of the present application mainly comprises power stage circuit 1 and control circuit 2.The topological structure of power stage circuit 1 can be that isolated topological structure also can for non-isolated topological structure, such as, reverse exciting topological structure, positive activation type topological structure etc. in isolated, and non-isolated in Buck type topological structure, Boost type topological structure etc.In the present embodiment, the structure of power stage circuit 1, for reverse exciting topological structure, its bag main switch Q1, draws together transformer T, sustained diode 1, output capacitance C1.The first end of the former limit winding L 1 of transformer T receives the DC input voitage VIN of described power stage circuit 1, second end is connected with the first end of main switch Q1, second end of main switch Q1 is couple to earth terminal, the first end of the vice-side winding L2 of transformer T and the second end of former limit winding L 1 are Same Name of Ends, and be connected with the anode of sustained diode 1, second end ground connection, the negative electrode of diode D1 is connected with the first end of output capacitance C1, the second end ground connection of output capacitance C1.Control circuit 2, for output switch control signal, to control conducting and the shutoff of main switch Q1, makes output voltage VO UT output capacitance C1 being formed Switching Power Supply, for the needs of load.
Further, Switching Power Supply also comprises power supply circuits 3 and start-up circuit 4.Power supply circuits 3 are for providing supply power voltage VCC for control circuit 2, and it mainly comprises and fills energy-storage travelling wave tube 31 and charging circuit 32.Charging circuit is for charging to energy-storage travelling wave tube with the supply power voltage VCC of formation control circuit 2 on energy-storage travelling wave tube, and the size variation of the speed of charging and the output voltage VO UT of Switching Power Supply, namely output voltage VO UT is larger, charging rate is faster, and the voltage VCC on energy-storage travelling wave tube 31 can arrive fast and stabilize to the supply power voltage needed when control circuit 2 normally works.As shown in Figure 1, in the present embodiment, energy-storage travelling wave tube 31 can be partially installing capacitor C2, charging circuit 32 can comprise auxiliary winding L 3, its first end ground connection, second end obtains the voltage VL3 proportional with output voltage VO UT, the first end ground connection of partially installing capacitor C2, the second end of the second end and auxiliary winding L 3 couples, and the supply power voltage VCC of this end output control circuit 2.Charging circuit 32 also can comprise resistance R1, diode D2 further, and wherein resistance R1 is connected between the negative electrode of diode D2 and second end of partially installing capacitor C2, and the anode of diode D2 is connected with the second end of auxiliary winding L 3.Diode D2 flows in auxiliary winding L 3 for preventing the energy back on partially installing capacitor C2, and resistance R1 is comparatively level and smooth for making to the charging current of partially installing capacitor C2.
Due to control circuit 2 before activation, Switching Power Supply Non voltage output, then auxiliary winding L 3 can not be charged to energy-storage travelling wave tube, thus control circuit 2 cannot be started, therefore Switching Power Supply also comprises start-up circuit 4, be connected between power stage circuit 2 DC voltage input end (exporting one end of DC input voitage VIN) and second end (i.e. second end of partially installing capacitor C2) of energy-storage travelling wave tube 31, before control circuit 2 starts, DC input voitage VIN charges to energy-storage travelling wave tube 31 by start-up circuit 4, when the voltage rise on energy-storage travelling wave tube 31 is to when can start control circuit 2, control circuit 2 just can start.In the present embodiment, start-up circuit can be starting resistance R2, it connects described between DC voltage input end and second end of partially installing capacitor C2, after switching voltage powers on, the voltage of DC voltage input end is charged to partially installing capacitor C2 by resistance R2, thus the voltage VCC on C2 is increased, until when the value of voltage VCC reaches the startup required voltage of control circuit 2, control circuit 2 starts to start.
In this application, control circuit 2 comprises: voltage feedback circuit 21, current feedback circuit 22 and switching signal produce circuit 23.Wherein switching signal produces circuit 23, for producing the switch controlling signal VG of main switch Q1 according to the first feedback signal VSEN and the second feedback signal VISEN.
Voltage feedback circuit 21 characterizes the first feedback signal VSEN of output voltage VO UT for obtaining, its can adopt existing any can the circuit realiration of sampling and outputting voltage signal, such as in the present embodiment by being connected to the divider resistance R2 between the second end of auxiliary winding L 3 and earth terminal in turn, R3 can form voltage feedback circuit 21, the Nodes that resistance R2 and R3 is connected exports the branch pressure voltage of the second end place voltage VL3 of auxiliary winding L 3, then this branch pressure voltage VSEN is the first feedback signal VSEN characterizing output voltage VO UT, itself and output voltage VO UT proportion relation, certainly also directly output voltage VO UT can be exported after resistor voltage divider circuit the first feedback signal VSEN characterizing output voltage VO UT.
Current feedback circuit 22, for obtaining the second feedback signal VISEN characterizing and flow through the electric current of main switch Q1, the specific implementation of its circuit is by existing any circuit realiration that can realize current sampling signal, such as in this application, the resistance R4 be connected between second end of main switch Q1 and earth terminal is sampled to realize current feedback circuit 22.Voltage on resistance R4 and the current in proportion flowing through main switch Q1, therefore can be used as the second feedback signal VISEN characterizing and flow through the electric current of main switch Q1.
As shown in Figure 2, it is the circuit structure diagram of Fig. 1 breaker in middle signal generating circuit, switching signal produces circuit 23 and comprises: output voltage detecting circuit 231, peak current limit circuit 232 and constant on-time produce circuit 233, also can comprise supply power voltage testing circuit 234 and logical circuit 235 further.
Output voltage detecting circuit 231 for judging the magnitude relationship of the first feedback signal VSEN and first threshold signal VREF1, and exports output detection signal VD1.Peak current limit circuit 232 is connected with the output of output voltage detecting circuit 231, during indicating described first feedback signal VSEN to be less than described first threshold signal VREF1 at output detection signal VD1, limit the peak value of described second feedback signal VISEN, and effective peak value restriction signal IPK is exported when described second feedback signal VISEN reaches limited peak value, turn off to control described main switch Q1.Constant on-time produces circuit 233 and is connected with the output of output voltage detecting circuit 231, during being greater than described first threshold signal VREF1 for indicating the first feedback signal VSEN at output detection signal VD1, the ON time controlling main switch Q1 is a Time constant, and effective Time constant signal TON is exported when the ON time of main switch Q1 reaches described Time constant, turn off to control main switch Q1.As can be seen here, control circuit 2 is when the first feedback signal VSEN is less than described first threshold signal VREF1, conducting and the shutoff of main switch Q1 is controlled with peak-current mode, when first feedback signal VSEN is greater than described first threshold signal VREF1, control conducting and the shutoff of main switch Q1 with constant on-time control model.
Supply power voltage testing circuit 234, for detecting supply power voltage VCC and first reference voltage of described control circuit, the magnitude relationship of the second reference voltage and tertiary voltage, and export for power detection signal VD12, described control circuit 2 is started working when described supply power voltage reaches described second reference voltage, during described supply power voltage VCC is greater than the first reference voltage or is less than the 3rd reference voltage, control described main switch Q1 turn off always, wherein, described first reference signal is greater than described second reference signal, described second reference signal is greater than described 3rd reference signal.
Logical circuit 234 limits signal IPK, Time constant signal TON for receiving peak value, supplies power detection signal VD12 and conductivity control signal VS, and the switch controlling signal VG of output switch pipe Q1.Switch controlling signal VG is also fed back to constant on-time and produces circuit 233, to produce Time constant signal TON according to it.When supply power voltage detection signal VD2 sign supply power voltage VCC reaches the second reference voltage, control circuit 2 is started working, described logical circuit 235 exports the switch controlling signal of main switch Q1, this process is specially: when conductivity control signal VS is effective, switch controlling signal VG controls main switch Q1 conducting, when any one in peak value restriction signal IPK and Time constant signal TON is effective, switch controlling signal VG controls main switch Q1 and turns off.Wherein conductivity control signal VS is the signal triggering main switch Q1 conducting, it obtains by prior art, such as it is the zero passage detection signal (effective when inductive current zero crossing) of described Switching Power Supply or also can be an external timing signal, also can be the signal produced according to actual output voltage and the desired output voltage of Switching Power Supply, when actual output voltage is less than desired output voltage, export effective conductivity control signal VS, to trigger main switch Q1 conducting.When supply power voltage detection signal VD2 sign supply power voltage VCC is greater than the first reference voltage or is less than the 3rd reference voltage, control circuit does not work, or the switch controlling signal VG control main switch Q1 that logical circuit 235 exports turns off always.In a preferred implementation, the first reference voltage can be made to be the overvoltage threshold voltage of control circuit 2, its value can be defaultly decided to be 25 ~ 35V, such as 30V, the second reference voltage is control circuit 2 actuation threshold threshold voltage; Its value is predeterminable is decided to be 20 ~ 30V, such as 25V, the value of the 3rd reference voltage can be set as the minimum supply power voltage of the normal need of work of control circuit 2, such setting makes the voltage range of the auxiliary winding L 3 in power supply circuits 3 become large, therefore, as shown in Figure 1, voltage stabilizing circuit (being arranged in prior art between resistance R5 and energy-storage travelling wave tube 3) need not be additionally set in power supply circuits 4, also can also can normally work by control circuit under fully loaded even semi-load, decrease the components and parts of Switching Power Supply, save manufacturing cost.
Therefore, during the first feedback signal characterizing output voltage is less than first threshold signal, show that output voltage is not also established to and is maintained the value needed for load, namely the output voltage values during this is lower, the speed that voltage on partially installing capacitor increases is slower, therefore need to adopt Peak Current-Mode Controlled Circuit to control conducting and the shutoff of main switch, thus the peak value of the second feedback signal VISEN can be defined as larger value, to accelerate gathering way of output voltage, and then the voltage on partially installing capacitor can be made to increase fast, when reaching first threshold signal to the first feedback signal, show that output voltage is to be established to the value needed for load, voltage on partially installing capacitor has now risen to control circuit and normally to have worked required supply power voltage, and this value can be maintained always, after this just main switch turn-on and turn-off are controlled with constant conduction control model, Switching Power Supply is made to enter steady state operating conditions, to realize high PF (power factor (PF)) performance of Switching Power Supply.
Further, in the present embodiment, output voltage detecting circuit 231 is also for judging the magnitude relationship of the first feedback signal VSEN and Second Threshold signal VREF2, wherein Second Threshold signal VREF2 is less than first threshold signal VREF1, then output voltage detecting circuit 231 output detection signal VD1 also can indicate the size of the first feedback signal VSEN and Second Threshold signal VREF2.Therefore output detection signal VD1 can indicate that the first feedback signal VSEN is less than Second Threshold signal VREF2, the first feedback signal VSEN is greater than Second Threshold signal VREF2 and be less than first threshold signal VREF1, the first feedback signal VSEN is greater than these three kinds of states of first threshold signal VREF1.As shown in Figure 3A, it is a kind of circuit structure diagram of output voltage detecting circuit in Fig. 2, and output voltage detecting circuit 231 can be realized by the first comparator CP1, the second comparator CP2.The input of the first comparator CP1 receives the first feedback signal VSEN and first threshold signal VREF1 respectively, to compare this two signals, and exports the first comparison signal V1.The input of the second comparator CP2 receives the first feedback signal VSEN and Second Threshold signal VREF2 respectively, to compare this two signals, and exports the second comparison signal V2.First comparison signal V1 and the second comparison signal V2 mono-piece forms output detection signal VD1.
Peak current limit circuit 232 is during output detection signal VD1 indicates the first feedback signal VSEN to be less than Second Threshold signal VREF2, the peak value of the second feedback signal VISEN is defined as the 3rd threshold signal VREF3, during output detection signal VD1 indicates the first feedback signal VSEN to be less than Second Threshold signal VREF2 and is greater than first threshold signal VREF1, the peak value of the second feedback signal VISEN is defined as the 4th threshold signal VREF4, wherein, the 3rd threshold signal VREF3 is less than the 4th threshold signal VREF4.As shown in Figure 3 B, it comprises the first switch S 1, second switch S2, the 3rd comparator CP3, the first inverter N1 and first and door AND1 to peak current limit circuit in Fig. 2 232 1 kinds of circuit structure diagrams,
The first end of the first switch S 1 receives described 3rd threshold signal VREF3, second end is connected with the first input end (such as inverting input "-") of described 3rd comparator CP3, switch control terminal receives the signal contrary with described second comparison signal V2 state, as shown in the figure, this signal can be the signal that the second comparison signal V2 exports after an inverter.The first end of second switch S2 receives described 4th threshold signal VREF4, second end is connected with the first input end of described 3rd comparator CP3, switch control terminal receives described second comparison signal V2, second input (such as in-phase input end "+") of described 3rd comparator CP3 receives described second feedback signal VISEN, output exports the 3rd comparison signal V3 to described first and the first input end of door AND1, the input of described first inverter N1 receives described first comparison signal V1, described first receives the output signal of described first inverter N1 with second input of door AND1, output exports described peak value and limits signal IPK.Wherein, 3rd threshold signal VREF3, the 4th threshold signal VREF4 can be provided by voltage source U1, U2 in the present embodiment respectively, then the first end of the first switch S 1 is connected with the output of voltage source U1, and the first end of second switch S2 is connected with the output of voltage source U2.
Fig. 3 C is a kind of circuit structure diagram that in Fig. 2, constant on-time produces circuit.In the present embodiment, Time constant produces circuit 233 and comprises charging capacitor C3, charging control switch S3, charging current source A0, the 4th comparison circuit CP4 and second and door AND2, and respective annexation as shown in Figure 3 C; When described main switch Q1 leads to, described charging control switch S3 turns off, described charging current source A0 charges to described charging capacitor C3, when described main switch Q1 turns off, described charging control switch S3 conducting, described charging capacitor C3 is discharged by described charging control switch S3, and therefore the on off state of charging control switch S3 can be controlled by the non-signal of switch controlling signal VG.Described 4th comparator CP4, first input end (such as in-phase input end "+") receive voltage on described charging capacitor C3, second input (such as inverting input "-") receives the reference voltage V REF0 characterizing described Time constant, and export the 4th comparison signal V4 to described second and the first input end of door AND2, described second receives described first comparison signal V1 with second input of door AND2, and output exports described Time constant signal TON.Therefore, constant on-time produces circuit 233, only during described first feedback signal VSEN is greater than described first threshold signal VREF1, second ON time that could control described main switch Q1 is a Time constant, and effective Time constant signal TON is exported when the ON time of described main switch Q1 reaches described Time constant, turn off to control described main switch Q1, thus make Switching Power Supply enter constant on-time control model, to obtain higher PF performance after output voltage is set up.
As shown in Figure 3 D, the embodiment of the present application gives a kind of realizing circuit structure chart of supply power voltage testing circuit 234 in a kind of Fig. 2, this circuit comprises the 5th comparator CP5, 6th comparator CP6 and the 7th comparator CP7, described 5th comparator CP5 is used for the size of more described supply power voltage VCC and described first reference voltage VCC_OVP, and export the 5th comparison signal V5, described 6th comparator CP6 is used for the size of more described supply power voltage VCC and described second reference voltage VCC_ON, and export the 6th comparison signal V6, described 7th comparator CP7 is used for the size of more described supply power voltage VCC and described 3rd reference voltage VCC_OFF, and export the 7th comparison signal V7, described 5th comparison signal V5, 6th comparison signal V6 and the 7th comparison signal V7 supplies power detection signal VD2 as described jointly.Wherein, the first reference signal VCC_OVP can be provided by power supply U3, 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 a kind of realizing circuit structure chart of logical circuit 235 in a kind of Fig. 2, this circuit comprises the first rest-set flip-flop RS1, second inverter N2, or door OR, 3rd with door AND3 and the second rest-set flip-flop RS2, the input of described second inverter NQ receives described 5th comparison signal V5, output is connected with the first input end of door AND3 with the described 3rd, the set termination of described first rest-set flip-flop RS1 receives described 6th comparison signal V6, reset terminal receives described 7th comparison signal V7, output is connected with second input of door AND3 with the described 3rd, two inputs that are described or door OR receive described peak value and limit signal IPK and Time constant signal TON, output is connected with door AND3 the 3rd input with the described 3rd, the set end of described second rest-set flip-flop RS2 is connected with the output of door AND3 with the described 3rd, reset terminal receives described conductivity control signal VS, output exports described switch controlling signal VG.In the present embodiment, conductivity control signal VS may be selected to be the zero passage detection signal ZX of Switching Power Supply.
Therefore, control circuit 2 starts to start work when supply power voltage VCC reaches the second reference signal VCC_ON, and at control circuit 2 upon actuation, if when supply power voltage VCC is between the first reference signal VCC_OVP and the 3rd reference signal VCC_OFF, during the first feedback signal VSEN is less than described first threshold signal VREF1, namely during controlling main switch with Peak Current-Mode Controlled Circuit, and first the peak value of the second feedback signal VISEN is defined as less value, continuous current mode mode of operation is entered to prevent Switching Power Supply, such setting, when output short-circuit, first feedback signal VSEN is very little, the peak value of the second feedback signal VISEN is restricted to the 3rd threshold signal VREF3 of smaller value, be conducive to the short-circuit dissipation reducing Switching Power Supply, and then the peak value of the second feedback signal VISEN is defined as larger value, to make, the supply power voltage of control circuit 2 is quick must be risen to and be maintained the voltage of its normal need of work, during the first feedback signal VSEN is greater than first threshold signal VREF1, the supply power voltage of control circuit 2 is to stabilize to required voltage, be constant conduction control model by the control mode switch of Switching Power Supply, to improve the high PF performance of Switching Power Supply.
The working waveform figure of the Switching Power Supply that Fig. 4 provides for the embodiment of the present application.
See Fig. 4, with the course of work analyzing the Switching Power Supply in the application with realize high PF type can while also enough start fast and enter the principle of steady operation.In the t0 moment, Switching Power Supply just powers on, and DC input voitage VIN is charged to partially installing capacitor C2 by starting resistance R1, and the voltage VCC on partially installing capacitor C2 is increased, now owing to not having output voltage, the first feedback signal VSEN and the second feedback signal VISEN is zero.To the t1 moment, the value of voltage VCC reaches the second reference voltage VCC_ON, control circuit 2 starts to start work, output voltage VO UT starts by zero increase, then the first feedback signal VSEN also starts to increase, due to now, control circuit is to start work, a large amount of electric currents can be extracted from partially installing capacitor C2, and now output voltage is not yet set up, power supply circuits make the value of its voltage rise can't make up because control circuit extracts the electric current value that makes the voltage VCC on partially installing capacitor C2 to decline to partially installing capacitor C2 charging, therefore the voltage on partially installing capacitor generally speaking can decline always, therefore need to adopt Peak Current-Mode Controlled Circuit to control main switch, by rational setting parameter, improve the speed that on output capacitance C1, voltage increases, namely output voltage is made to increase fast, to accelerate power supply circuits to partially installing capacitor C2 charging rate, voltage VCC on partially installing capacitor C2 is gone up.But in order to prevent Switching Power Supply from entering continuous current mode mode of operation, can be now first the 3rd threshold signal VREF3 that a value is less by the peak-limitation of the second feedback signal VISEN.Until the t2 moment, first feedback signal VSEN is increased to Second Threshold signal VREF2, even if show that the peak value after this increasing by the second feedback signal also can not make Switching Power Supply enter continuous current mode operating state, therefore now, be the 4th threshold signal VREF4 that a value is larger by the peak-limitation of the second feedback signal VISEN, thus make output voltage VO UT be increased to the t3 moment fast, first feedback signal VSEN is increased to first threshold signal VREF1, , be increased to the supply power voltage of the normal need of work of control circuit 2 fast to making the voltage VCC on partially installing capacitor C2 and this voltage can be maintained always, after this state of main switch Q1 is controlled with constant conduction control model, to improve the PF performance of Switching Power Supply.If when the supply power voltage VCC of control circuit is greater than the first reference voltage VCC_OVP or is less than the 3rd reference voltage VCC_OFF; control circuit 2 no longer work or; the switch controlling signal VG exported controls main switch Q1 and turns off always, to realize overvoltage to control circuit or under-voltage protection.
Therefore, the switching power source control circuit that the application provides, during the first feedback signal characterizing output voltage is less than first threshold signal, the Peak Current-Mode Controlled Circuit of the large peak current of main employing controls main switch, increase fast to make output voltage, thus the charging rate accelerated partially installing capacitor, make the voltage on partially installing capacitor increase fast and stabilize to control circuit normally to work required supply power voltage, after the first feedback signal is greater than first threshold signal, output voltage is set up, constant on-time control model is adopted to control main switch ever since, to realize the high PF performance of closing power supply.In addition, at the last short time of the control procedure of peak electricity control model, the peak value of the electric current flowing through main switch is arranged smaller, and within the rear a long time, the peak value of the electric current flowing through main switch is arranged larger, can prevent Switching Power Supply from entering continuous current mode operating state.Therefore the Switching Power Supply that provides of the application is while realizing high PF performance, also capable of fast starting and enter stable state fast, and can be operated in discontinous mode always.
The principle that above-mentioned control method realizes and obtain effect and set forth in other embodiment of the application, make an explanation no longer further at this, in addition the first feedback signal in each embodiment of the application, the second feedback signal, first threshold signal, Second Threshold signal, the 3rd threshold signal that is the 4th threshold signal can be voltage signal also can be current signal, and signal effectively makes finger signal be in effective status in this application, and effective status is high level, but also can be low level in other is implemented.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (14)
1. a control circuit for Switching Power Supply, is provided with main switch in described Switching Power Supply, and described control circuit comprises:
Voltage feedback circuit, for obtaining the first feedback signal of the output voltage characterizing described Switching Power Supply;
Output voltage detecting circuit, for detecting the magnitude relationship of described first feedback signal and first threshold signal;
Current feedback circuit, for obtaining the second feedback signal characterizing and flow through the electric current of described main switch;
Peak current limit circuit, during being less than described first threshold signal in described first feedback signal, limit the peak value of described second feedback signal, and export effective peak value restriction signal when described second feedback signal reaches limited peak value, turn off to control described main switch;
Constant on-time produces circuit, during being greater than described first threshold signal in described first feedback signal, the ON time controlling described main switch is a Time constant, and effective Time constant signal is exported when the ON time of described main switch reaches described Time constant, turn off to control described main switch.
2. control circuit according to claim 1, it is characterized in that, also comprise supply power voltage testing circuit, for the magnitude relationship of the supply power voltage and the first reference voltage, the second reference voltage and tertiary voltage that detect described control circuit, and export for power detection signal, described control circuit is started working when described supply power voltage reaches described second reference voltage, during described supply power voltage is greater than the first reference voltage or is less than the 3rd reference voltage, control described main switch turn off always
Wherein, described first reference signal is greater than described second reference signal, and described second reference signal is greater than described 3rd reference signal.
3. control circuit according to claim 2, it is characterized in that, also bag logical circuit, limit signal, Time constant signal for receiving described peak value, supply power detection signal and conductivity control signal, and exporting the switch controlling signal of described main switch, wherein said conductivity control signal is the signal triggering described main switch conducting.
4. control circuit according to claim 1, is characterized in that, described output voltage detecting circuit is also for detecting the magnitude relationship of described first feedback signal and Second Threshold signal, and described Second Threshold signal is less than described first threshold signal;
Described peak current limit circuit is during described first feedback signal is less than described Second Threshold signal, the peak value of described second feedback signal is defined as the 3rd threshold signal, during described first feedback signal is greater than described Second Threshold signal and is less than described first threshold signal, the peak value of described second feedback signal is defined as the 4th threshold signal;
Wherein, described 3rd threshold signal is less than described 4th threshold signal.
5. control circuit according to claim 4, it is characterized in that, described output voltage detecting circuit comprises the first comparator and the second comparator, described first comparator is used for more described first feedback signal and first threshold signal, and export the first comparison signal, described second comparator is used for more described first feedback signal and described Second Threshold signal, and exports the second comparison signal.
6. control circuit according to claim 5, is characterized in that, described peak current limit circuit comprises the first switch, second switch, the 3rd comparator, the first inverter and first and door,
The first end of described first switch receives described 3rd threshold signal, and the second end is connected with the first input end of described 3rd comparator, and switch control terminal receives the signal contrary with described second comparison signal state.
The first end of described second switch receives described 4th threshold signal, and the second end is connected with the first input end of described 3rd comparator, and switch control terminal receives described second comparison signal,
Second input of described 3rd comparator receives described second feedback signal, and output inputs the 3rd comparison signal to described first and the first input end of door,
The input of described first inverter receives described first comparison signal, and described first receives the output signal of described first inverter with the second input of door, and output exports described peak value and limits signal.
7. control circuit according to claim 5, is characterized in that, described constant on-time produces circuit and comprises charging capacitor, charging control switch, charging current source, the 4th comparator and second and door;
When described main switch conducting, described charging control switch turns off, and described charging current source gives the charging of described charging capacitor, when described main switch turns off, and described charging control switch conducting, described charging capacitor is discharged by described charging control switch,
The first input end of described 4th comparator receives the voltage on described charging capacitor, second input receives the reference voltage characterizing described Time constant, and export the 4th comparison signal to described second and the first input end of door, described second receives described first comparison signal with the second input of door, and output exports described Time constant signal.
8. control circuit according to claim 3, is characterized in that, described supply power voltage testing circuit comprises the 5th comparator, the 6th comparator and the 7th comparator,
Described 5th comparator is used for the size of more described supply power voltage and described first reference voltage, and exports the 5th comparison signal,
Described 6th comparator is used for the size of more described supply power voltage and described second reference voltage, and exports the 6th comparison signal,
Described 7th comparator is used for the size of more described supply power voltage and described 3rd reference voltage, and exports the 7th comparison signal,
Described 5th comparison signal, the 6th comparison signal and the 7th comparison signal supply power detection signal as described jointly.
9. control circuit according to claim 8, is characterized in that, described logical circuit comprise the first rest-set flip-flop, the second inverter or door, the 3rd with door and the second rest-set flip-flop,
The input of described second inverter receives described 5th comparison signal, and output is connected with the first input end of door with the described 3rd,
The set termination of described first rest-set flip-flop receives described 6th comparison signal, and reset terminal receives described 7th comparison signal, and output is connected with the second input of door with the described 3rd,
Two inputs that are described or door receive described peak value and limit signal and Time constant signal, and output is connected with the family status three input with the described 3rd,
The set end of described second rest-set flip-flop is connected with the output of door with the described 3rd, and reset terminal receives described conductivity control signal, and output exports described switch controlling signal.
10. a Switching Power Supply, comprises the control circuit described in any in power stage circuit and claim 3 to 9, is provided with main switch in described power stage circuit.
11. Switching Power Supplies according to claim 10, is characterized in that, also comprise power supply circuits, the charging circuit that described power supply circuits comprise energy-storage travelling wave tube and charge to described energy-storage travelling wave tube,
The speed that described charging circuit charges to described energy-storage travelling wave tube is with the size variation of the output voltage of described Switching Power Supply, and described energy-storage travelling wave tube exports the supply power voltage of described control circuit.
12. Switching Power Supplies according to claim 11, is characterized in that, described charging circuit comprises auxiliary winding, the first end ground connection of described auxiliary winding, and the second end obtains the voltage proportional with described output voltage;
The first end ground connection of described energy-storage travelling wave tube, the second end of the second end and described auxiliary winding couples, and exports described supply power voltage.
13. Switching Power Supplies according to claim 12, is characterized in that, described charging circuit also comprises diode and resistance, and the anode of described diode is connected to the second end of described auxiliary winding, and negative electrode connects the second end of described energy-storage travelling wave tube by described resistance.
14. Switching Power Supplies according to claim 10, is characterized in that, also comprise start-up circuit, and the DC input voitage of described power stage circuit is charged to described energy-storage travelling wave tube by described start-up circuit.
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