CN104362839B - Four-tube converter control circuit, four-tube converter and light load control method of four-tube converter - Google Patents

Four-tube converter control circuit, four-tube converter and light load control method of four-tube converter Download PDF

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Publication number
CN104362839B
CN104362839B CN201410733488.9A CN201410733488A CN104362839B CN 104362839 B CN104362839 B CN 104362839B CN 201410733488 A CN201410733488 A CN 201410733488A CN 104362839 B CN104362839 B CN 104362839B
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circuit
signal
voltage
compensation
compensation signal
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CN104362839A (en
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杭开郎
孙良伟
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Hangzhou Silergy Semiconductor Technology Ltd
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Hangzhou Silergy Semiconductor Technology Ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/0003Details of control, feedback or regulation circuits
    • H02M1/0032Control circuits allowing low power mode operation, e.g. in standby mode
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/0048Circuits or arrangements for reducing losses
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

The invention discloses a four-tube converter control circuit, a four-tube converter and a light load control method of the four-tube converter. The light load control method comprises the following steps: generating a voltage compensation signal via a voltage compensation circuit; generating a current compensation signal via a current compensation circuit; comparing the voltage compensation signal with a preset low-limited voltage via a sleep mode control circuit; and indicating the four-tube converter control circuit to enter or exit from a sleep mode according to a comparative result. According to the scheme, the sleeping and the starting of the four-tube converter are controlled via the voltage compensation signal, so that the sleeping and the starting can be directly controlled via the voltage compensation signal, i.e., multiple judgments are not required after the four-tube converter control circuit enters a pulse frequency modulation mode, and thus the additional light load control circuits are avoided so as to realize circuit simplification. Meanwhile, when the four-tube converter control circuit enters the sleeping mode, a duty ratio information holding circuit is additionally arranged so as to guarantee the accuracy of a duty ratio signal when the circuit exits from the sleeping mode.

Description

A kind of four pipe converter control circuits, four pipe changers and its light load control method
Technical field
The present invention relates to changer field, more particularly, to a kind of four pipe converter control circuits, four pipe changers and its light Carry control method.
Background technology
Four pipe One Buck-Boost converter body have input and output same polarity, switch tube voltage stress is low, not only can boost but also can The advantages of blood pressure lowering, is it is adaptable to low pressure exports occasion.
Ultimate principle for four pipe One Buck-Boost converter body Average Current Control is:Make voltage compensation signal VCOMPWith The signal I of inductive current meansigma methodssSENSEIt is compared, obtain current compensation signal.In underloading, typically produce dormancy and control Signal, makes voltage changer switch under work and dormancy two states, shutdown switch in the dormant state, thus reduce Power consumption during underloading, improves light-load efficiency.
At present, the light load control method of the four pipe One Buck-Boost converter body based on Average Current Control for the realization is:When defeated When going out voltage feedback signal FB less than first threshold, enter CCM pattern, i.e. continuous operation mode;When inductive current meansigma methodss Signal ISENSEDuring less than Second Threshold, enter PFM pattern, i.e. pulse frequency modulated pattern, in PFM pattern, according to output electricity The size of pressure feedback signal FB realizes the switching under work and resting state, thus reaching the purpose of underloading control.
However, underloading control is realized using aforesaid way, need, after entering PFM pattern, to be further continued for being judged, need To judge through multiple, this is accomplished by increasing extra underloading control circuit, increased the complexity of circuit.
Content of the invention
In view of this, the present invention provides a kind of four pipe converter control circuits, four pipe changers and its light load control method, To solve to need additionally to increase underloading control circuit in prior art, increased the problem of the complexity of circuit, its concrete scheme As follows:
A kind of four pipe converter control circuits, including:Voltage compensating circuit, the dormancy being connected with described voltage compensating circuit Mode control circuit, the current compensation circuit being respectively connected with described voltage compensating circuit and park mode control circuit, with institute State the duty cycle information holding circuit that park mode control circuit and current compensation circuit are respectively connected with, with described current compensation electricity The switch controlling signal that road is connected produces circuit, wherein:
Described voltage compensating circuit is used for receiving output voltage feedback signal and reference voltage signal, and by the institute receiving State output voltage feedback signal and reference voltage signal carries out application condition and compensation, obtain voltage compensation signal;
Described park mode control circuit is used for receiving described voltage compensation signal, and by described voltage compensation signal with pre- The low pincers voltage first setting is compared, and obtains comparative result, and described comparative result is used for instruction and enters or exit park mode;
Described current compensation circuit is used for receiving described voltage compensation signal and inductive current average value signal, carries out error Compare and compensate, produce current compensation signal;
Described duty cycle information holding circuit is used for keeping by keeping described current compensation signal in the hibernation mode Duty cycle information;
Described switch controlling signal produces circuit and is used for according to described current compensation signal, sawtooth signal and clock signal Produce switch controlling signal to control the conducting state of power tube.
Further, described park mode control circuit is:First comparator,
Described first comparator is used for relatively described voltage compensation signal and low pincers voltage, and exports comparative result, specifically 's:
When described voltage compensation signal is less than described low pincers voltage set in advance, comparative result is low level, works as institute When stating voltage compensation signal more than described low pincers voltage set in advance, comparative result is high level.
Further, described duty cycle information holding circuit is first switch K1,
Described first switch K1 is used for disconnecting when receiving described comparative result for low level, is receiving described comparison Result is for closing during high level.
Further, described duty cycle information holding circuit includes:Second switch K2, the first not gate N1, controlled voltage mould Block, wherein:
The stationary contact of described second switch K2 is connected with current compensation circuit, movable contact respectively with the first not gate N1 and controlled Voltage module is connected, and the other end of described first not gate is connected with described park mode control circuit;
When described comparative result is low level, described second switch K2 closure, described controlled voltage module for power supply;Described ratio When relatively result is high level, described second switch K2 disconnects, and described voltage compensation signal accesses.
Further, described voltage compensating circuit includes:First error amplifier and the first compensation circuit, wherein:
The outfan of described first error amplifier passes through the first compensation circuit ground connection.
Further, described current compensation circuit includes:Second error amplifier and the second compensation circuit, wherein:
While the outfan of described second error amplifier connects the outfan of described park mode control circuit, pass through Second compensation circuit ground connection.
Further, described switch controlling signal produces circuit and includes:Second comparator, the 3rd comparator, forward bias Power supply and logic circuit, wherein:
The positive input of described second comparator passes through the outfan of forward bias power supply and described current compensation circuit It is connected, the reverse input end of described second comparator receives sawtooth waveforms letter with the reverse input end of described 3rd comparator simultaneously Number, the positive input of described 3rd comparator is connected with the outfan of described current compensation circuit, and described logic circuit is simultaneously It is connected with the outfan of described second comparator and the 3rd comparator, receive clock signal simultaneously.
A kind of four pipe changer light load control methods, are applied to four pipe converter control circuits, including:
Judge whether the voltage compensation signal obtaining is less than low pincers voltage set in advance;
If so, send low level signal, described four pipe converter control circuits enter park mode, and using dutycycle letter Breath holding circuit keeps duty cycle information;
Otherwise, send high level signal, described four pipe converter control circuits enter normal mode of operation.
Further, before whether the described voltage compensation signal judging to obtain is less than low pincers voltage set in advance, Also include:
Receive output voltage feedback signal and reference voltage signal;
The described output voltage feedback signal receiving and reference voltage signal are carried out application condition and compensation, obtains electricity Pressure thermal compensation signal.
A kind of four pipe changers, including four pipe converter control circuits described in claim 1-7 any one.
From technique scheme as can be seen that four pipe converter control circuits disclosed in the present application, four pipe changers and its Light load control method, produces voltage compensation signal by voltage compensating circuit, and current compensation circuit produces current compensation signal, not Sleep mode control circuit comparison voltage thermal compensation signal and low pincers voltage set in advance, and according to comparative result instruction four pipe conversion Device control circuit enters or exits park mode.This programme is controlled the dormancy of four pipe changers and opens by voltage compensation signal Open it is achieved that directly control the purpose of dormancy and unlatching by voltage compensation signal, pulse frequency modulated pattern need not entered Afterwards, more repeatedly judged, it is to avoid increase extra underloading control circuit is so that circuit is simplified.Meanwhile, entering dormancy During pattern, increased duty cycle information holding circuit, with ensure circuit when exiting park mode vacuum than the accuracy of signal.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, acceptable Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a kind of structural representation of four pipe converter control circuits disclosed in the embodiment of the present invention;
Fig. 2 is a kind of electrical block diagram of voltage compensating circuit disclosed in the embodiment of the present invention;
Fig. 3 is a kind of circuit configuration schematic diagram of current compensation circuit disclosed in the embodiment of the present invention;
Fig. 4 is the electrical block diagram that a kind of switch controlling signal disclosed in the embodiment of the present invention produces circuit;
Fig. 5 is a kind of electrical block diagram of four pipe converter control circuits disclosed in the embodiment of the present invention;
Fig. 6 is a kind of electrical block diagram of four pipe converter control circuits disclosed in the embodiment of the present invention;
Fig. 7 is a kind of flow chart of four pipe changer light load control methods disclosed in the embodiment of the present invention.
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 description is it is clear that described embodiment is only a part of embodiment of the present 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 not making creative work Embodiment, broadly falls into the scope of protection of the invention.
The invention discloses a kind of four pipe converter control circuits, its structural representation is as shown in figure 1, include:
Voltage compensating circuit 11, the park mode control circuit 12 being connected with voltage compensating circuit 11, with voltage compensation electricity The current compensation circuit 13 that road 11 and duty cycle information holding circuit 15 are respectively connected with, the switch being connected with current compensation circuit 13 Control signal produces circuit 14, and the duty cycle information being respectively connected with park mode control circuit 12 and current compensation circuit 13 is protected Hold circuit 15.
Wherein, voltage compensating circuit 11 is used for receiving output voltage feedback signal FB and reference voltage signal VREF, and will connect The output voltage feedback signal FB receiving and reference voltage signal VREFCarry out application condition and compensation, obtain voltage compensation signal VCOMP.
Voltage compensating circuit 11 specifically can include:First error amplifier and the first compensation circuit, wherein:First error The outfan of amplifier passes through the first compensation circuit ground connection.
First compensation circuit specifically can include first resistor and the first electric capacity, then the circuit structure of voltage compensating circuit 11 Schematic diagram is as shown in Fig. 2 include:First error amplifier 21, first resistor R1, the first electric capacity C1, wherein:
The outfan of the first error amplifier 21 passes sequentially through first resistor R1 and the first electric capacity C1 ground connection.
The positive input of the first error amplifier 21 receives reference voltage signal VREF, it is electric that reverse input end receives output Pressure feedback signal FB, by output voltage feedback signal FB and reference voltage signal VREFCarry out application condition and compensation, obtain voltage Thermal compensation signal VCOMP, and send.
Wherein, the circuit structure shown in Fig. 2 is only an example of the circuit structure of voltage compensating circuit 11, and voltage is mended Repay circuit 11 and be not limited to the circuit structure shown in Fig. 2, voltage compensating circuit 11 can realize voltage for other is any The circuit structure compensating.
Park mode control circuit 12 is used for receiving voltage thermal compensation signal VCOMP, and by voltage compensation signal VCOMPWith in advance The low pincers voltage V settingHYSIt is compared, obtains comparative result, this comparative result is used for instruction and enters or exit park mode.
Preferably, park mode control circuit 12 can be specially:First comparator.
The positive input of first comparator is connected with the outfan of voltage compensating circuit, receiving voltage thermal compensation signal VCOMP, the reverse input end reception low pincers voltage V set in advance of first comparatorHYS, the outfan of first comparator and duty It is connected than information holding circuit 15.
First comparator is used for comparison voltage thermal compensation signal VCOMPAnd low pincers voltage VHYS, and export comparative result to switch Control signal produces circuit 14, is used for making four pipe converter control circuits enter or exit park mode.
Current compensation circuit 13 is used for receiving voltage thermal compensation signal VCOMPAnd inductive current average value signal ISENSE, carry out by mistake Difference compares and compensates, and produces current compensation signal ICOMP.
Current compensation circuit 13 specifically can include:Second error amplifier and the second compensation circuit, wherein:Second error While the outfan of amplifier connects the outfan of park mode control circuit, it is grounded by the second compensation circuit.
Second compensation circuit specifically can include:Second resistance, the second electric capacity and the 3rd electric capacity, then current compensation circuit Structural representation is as shown in figure 3, include:Second error amplifier 31, second resistance R2, the second electric capacity C2, the 3rd electric capacity C3, its In:
While the outfan of the second error amplifier 31 connects the outfan of park mode control circuit, pass sequentially through the Two resistance R2 and the second electric capacity C2 ground connection, the outfan of the second error amplifier 31 is by the 3rd electric capacity C3 ground connection simultaneously.Second The outfan of error amplifier 31 is connected with the outfan of park mode control circuit simultaneously, receives dormant control signal Standby.
Wherein, the circuit structure shown in Fig. 3 is only an example of the circuit structure of current compensation circuit 13, and electric current is mended Repay circuit 13 and be not limited to the circuit structure shown in Fig. 3, current compensation circuit 13 can realize voltage for other is any The circuit structure compensating.
The positive input of the second error amplifier 31 is connected with the outfan of voltage compensating circuit 11, and receiving voltage compensates Signal VCOMP, the signal I of the reverse input end reception inductive current meansigma methodss of the second error amplifier 31SENSE, carry out voltage benefit Repay signal VCOMPAnd the signal I of inductive current meansigma methodssSENSEApplication condition and compensation, obtain current compensation signal ICOMPConcurrently Send.
ISENSEIt is the direct current signal after inductive current sampling filter, represent the size of inductive current.When being supported on CCM pattern Under when slowly reducing, ISENSEReduce as well as the reduction of load.And whole four pipe One Buck-Boost converter body are operated in and close Under ring status, so, voltage compensation signal VCOMPSignal I with inductive current meansigma methodssSENSEEqual, when output current reduces When, voltage compensation signal VCOMPSignal I as well as inductive current meansigma methodssSENSEReduction and reduce.Therefore, using voltage Thermal compensation signal is controlling dormancy and opening.
When voltage compensation signal VCOMPLess than low pincers voltage VHYSWhen, dormant control signal Standby is low level, enters Park mode, now, stops the action of clock and power tube.
When output voltage feedback signal FB is reduced to reference voltage signal VREFWhen following, voltage compensating circuit 11 can make electricity Pressure thermal compensation signal VCOMPHigh too low pincers voltage VHYS, now, the dormant control signal of park mode control circuit 12 output Standby is high level, enters normal mode of operation, and power tube restarts work, is that output capacitance charges, until output electricity Pressure feedback signal FB exceeds reference voltage signal V againREF, lead to voltage compensation signal VCOMPAgain below low pincers voltage VHYS, Enter park mode.
Switch controlling signal produces circuit 14 and is used for receiving current compensation signal ICOMP, sawtooth signal RampWith clock letter Number clock, and according to current compensation signal ICOMP, sawtooth signal RampProduce switch controlling signal control with clock signal clock The conducting state of power tube processed.
Switch controlling signal produces the structural representation of circuit 14 as shown in figure 4, including:Second comparator 41, the 3rd ratio Compared with device 42, forward bias power supply 43 and logic circuit 44.
Wherein:The positive input of the second comparator 41 passes through the outfan of forward bias power supply 43 and current compensation circuit It is connected, the reverse input end of the second comparator 41 and the reverse input end of the 3rd comparator 42 receive sawtooth signal simultaneously Ramp, the positive input of the 3rd comparator 42 is connected with the outfan of current compensation circuit, and logic circuit 44 is simultaneously with second The outfan of comparator 41 and the 3rd comparator 45 is connected, and receives clock signal clock simultaneously, and the outfan of logic circuit 44 is defeated The signal going out is respectively signal DBUCKWith signal DBOOST.
Duty cycle information holding circuit 15 is used for keeping duty cycle signals, for when being in park mode, to dutycycle Signal is kept, to ensure the correctness of the current compensation signal when entering open mode, in order to avoid tending to saturation.
If being currently at light condition, and it is in park mode, when power tube no switch motion, inductive current is zero, So the signal I of inductive current meansigma methodssSENSEIt is zero, but now voltage compensation signal VCOMPLess than low pincers voltage VHYS, voltage benefit Repay signal VCOMPSignal I with inductive current meansigma methodssSENSENo longer equal, the closed loop being formed when CCM works no longer is set up, So during park mode, current compensation signal ICOMPSaturation can be tended to it is impossible to accurately represent corresponding duty cycle signals, when Exit park mode, when entering open mode, can be with wrong duty cycle signals work.Therefore, in order to ensure in open mode When, the accuracy of duty cycle signals, need to increase duty cycle information between current compensation circuit and park mode control circuit Holding circuit 15.
Four pipe converter control circuit disclosed in the present embodiment, produces voltage compensation signal, electricity by voltage compensating circuit Stream compensation circuit produces current compensation signal, park mode control circuit comparison voltage thermal compensation signal and low pincers electricity set in advance Pressure, and entered according to comparative result instruction four pipe converter control circuit or exit park mode.This programme passes through voltage compensation Signal is controlling the dormancy of four pipe changers and unlatching it is achieved that directly passing through the mesh of voltage compensation signal control dormancy and unlatching , more repeatedly need not be judged after entering band width modulating mode, it is to avoid the extra underloading control circuit of increase, Circuit is simplified.Meanwhile, when entering park mode, increased duty cycle information holding circuit, to ensure that circuit moving back Go out during park mode vacuum than the accuracy of signal.
Further, the duty cycle information holding circuit in four pipe converter control circuits disclosed in the present embodiment, permissible It is specially first switch K1, the structural representation of four pipe converter control circuits of application first switch K1 is as shown in Figure 5.
First switch K1 is used for disconnecting when receiving comparative result for low level, current compensation signal ICOMPIn dormancy mould During formula, discharged by compensating electric capacity and keep, thus can maintain duty cycle information during Closed loop operation;Compare knot receiving Fruit is first switch K1 closure during high level, and closed loop is formed, and enters CCM mode of operation.
Specifically, duty cycle information holding circuit 15 can also be specially second switch K2, the first not gate N1, controlled voltage Module 61, applies the structural representation of four pipe converter control circuits of above-mentioned duty cycle information holding circuit 15 as shown in Figure 6.
The stationary contact of second switch K2 is connected with current compensation circuit, movable contact respectively with the first not gate N1 and controlled voltage Module 61 is connected, and the other end of the first not gate N1 is connected with park mode control circuit.
When the dormant control signal of park mode control circuit output is low level, switch to high electricity through the first not gate N1 Flat, second switch K2 closes, now current compensation signal ICOMPNo longer determined by loop, but given by controlled voltage module 61 Go out;When exiting sleep mode, K2 disconnects, and determines current compensation signal I by current compensation circuitCOMPVoltage, Closed loop operation Mode is consistent with CCM.
Wherein, controlled voltage module 61 can be specially controlled voltage source VForce, controlled potential source VForceCan be by VINWith VOUTCalculate.
Present embodiment discloses a kind of four pipe changer light load control methods, it is applied to four pipe converter control circuits, its Flow chart as shown in fig. 7, comprises:
Voltage compensation signal V that step S71, judgement obtainCOMPWhether it is less than low pincers voltage V set in advanceHYS
Step S72, if so, transmission low level signal, four pipe converter control circuits enter park modes, and utilize duty Keep duty cycle information than information holding circuit;
Step S73, otherwise, sends high level signal, and four pipe converter control circuits enter normal mode of operation.
ISENSEIt is the direct current signal after inductive current sampling filter, represent the size of inductive current.When being supported on CCM pattern Under when slowly reducing, ISENSEReduce as well as the reduction of load.And whole four pipe One Buck-Boost converter body are operated in and close Under ring status, so, voltage compensation signal VCOMPSignal I with inductive current meansigma methodssSENSEEqual, when output current reduces When, voltage compensation signal VCOMPSignal I as well as inductive current meansigma methodssSENSEReduction and reduce.Therefore, using voltage Thermal compensation signal is controlling dormancy and opening.
When voltage compensation signal VCOMPLess than low pincers voltage VHYSWhen, dormant control signal Standby is low level, enters Park mode, now, stops the action of clock and power tube.
When output voltage feedback signal FB is reduced to reference voltage signal VREFWhen following, voltage compensating circuit 11 can make electricity Pressure thermal compensation signal VCOMPHigh too low pincers voltage VHYS, now, the dormant control signal of park mode control circuit 12 output Standby is high level, enters open mode, and power tube restarts work, is that output capacitance charges, until output voltage is anti- Feedback signal FB exceeds reference voltage signal V againREF, voltage compensating circuit 11 is to voltage compensation signal VCOMPElectric discharge, leads to voltage Thermal compensation signal VCOMPAgain below low pincers voltage VHYS, enter park mode.
Four pipe changer light load control method disclosed in the present embodiment, by comparison voltage thermal compensation signal with set in advance Low pincers voltage, and entered according to comparative result instruction four pipe converter control circuit or exit park mode.This programme passes through electricity Pressure thermal compensation signal is controlling the dormancy of four pipe changers and unlatching it is achieved that directly passing through voltage compensation signal control dormancy and opening The purpose opening, after entering pulse frequency modulated pattern, then need not repeatedly be judged, that is, in ccm mode, is realized interrupted work Make, it is to avoid increase extra underloading control circuit is so that circuit is simplified.Meanwhile, when entering park mode, increased and account for Empty ratio information holding circuit, with ensure circuit when exiting park mode vacuum than the accuracy of signal.
Further, in four pipe changer light load control methods disclosed in the present embodiment, before step S71, also include:
Step S74, reception output voltage feedback signal FB and reference voltage signal VREF
Step S75, by the output voltage feedback signal receiving FB and reference voltage signal VREFCarry out application condition and benefit Repay, obtain voltage compensation signal VCOMP.
Present embodiment discloses a kind of four pipe changers, it can include the tool of above-mentioned any four pipe converter control circuits Body structure, will not be described here.
In this specification, each embodiment is described by the way of going forward one by one, and what each embodiment stressed is and other The difference of embodiment, between each embodiment identical similar portion mutually referring to.For device disclosed in embodiment For, because it corresponds to the method disclosed in Example, so description is fairly simple, say referring to method part in place of correlation Bright.
Professional further appreciates that, in conjunction with the unit of each example of the embodiments described herein description And algorithm steps, can with electronic hardware, computer software or the two be implemented in combination in, in order to clearly demonstrate hardware and The interchangeability of software, generally describes composition and the step of each example in the above description according to function.These Function to be executed with hardware or software mode actually, the application-specific depending on technical scheme and design constraint.Specialty Technical staff can use different methods to each specific application realize described function, but this realization should Think beyond the scope of this invention.
The step of the method in conjunction with the embodiments described herein description or algorithm can directly be held with hardware, processor The software module of row, or the combination of the two is implementing.Software module can be placed in random access memory (RAM), internal memory, read-only deposit Reservoir (ROM), electrically programmable ROM, electrically erasable ROM, depositor, hard disk, moveable magnetic disc, CD-ROM or technology In known any other form of storage medium in field.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the present invention. Multiple modifications to these embodiments will be apparent from for those skilled in the art, as defined herein General Principle can be realized without departing from the spirit or scope of the present invention in other embodiments.Therefore, the present invention It is not intended to be limited to the embodiments shown herein, and be to fit to and principles disclosed herein and features of novelty phase one The scope the widest causing.

Claims (9)

1. a kind of four pipe converter control circuits are it is characterised in that include:Voltage compensating circuit, with described voltage compensating circuit Connected park mode control circuit, the current compensation being respectively connected with described voltage compensating circuit and park mode control circuit Circuit, the duty cycle information holding circuit being respectively connected with described park mode control circuit and current compensation circuit, and described The switch controlling signal that current compensation circuit is connected produces circuit, wherein:
Described voltage compensating circuit is used for receiving output voltage feedback signal and reference voltage signal, and described defeated by receive Go out voltage feedback signal and reference voltage signal carries out application condition and compensation, obtain voltage compensation signal;
Described park mode control circuit is used for receiving described voltage compensation signal, and by described voltage compensation signal with set in advance Fixed low pincers voltage is compared, and obtains comparative result, and described comparative result is used for instruction and enters or exit park mode;
Described current compensation circuit is used for receiving described voltage compensation signal and inductive current average value signal, carries out application condition And compensation, produce current compensation signal;
Described duty cycle information holding circuit is used for keeping duty by keeping described current compensation signal in the hibernation mode Compare information;
Described switch controlling signal produces circuit and is used for being produced according to described current compensation signal, sawtooth signal and clock signal Switch controlling signal is controlling the conducting state of power tube.
2. four pipe converter control circuits according to claim 1 are it is characterised in that described park mode control circuit For:First comparator,
Described first comparator is used for relatively described voltage compensation signal and low pincers voltage, and exports comparative result, specially:
When described voltage compensation signal is less than low pincers voltage, the comparative result of described first comparator output is low level;
When described voltage compensation signal is more than low pincers voltage, the comparative result of described first comparator output is high level.
3. four pipe converter control circuits according to claim 1 are it is characterised in that described duty cycle information holding circuit For first switch K1,
Described first switch K1 is used for disconnecting when receiving described comparative result for low level, is receiving described comparative result For closing during high level.
4. four pipe converter control circuits according to claim 1 are it is characterised in that described duty cycle information holding circuit Including:Second switch K2, the first not gate N1, controlled voltage module, wherein:
One end of described second switch K2 is connected with current compensation circuit, the other end respectively with the first not gate N1 and controlled voltage mould Block is connected, and the other end of described first not gate is connected with described park mode control circuit;
When described comparative result is low level, described second switch K2 closure, described controlled voltage module for power supply;Described compare knot When fruit is high level, described second switch K2 disconnects, and described voltage compensation signal accesses.
5. four pipe converter control circuits according to claim 1 are it is characterised in that described voltage compensating circuit includes: First error amplifier and the first compensation circuit, wherein:
The outfan of described first error amplifier passes through the first compensation circuit ground connection.
6. four pipe converter control circuits according to claim 1 are it is characterised in that described current compensation circuit includes: Second error amplifier and the second compensation circuit, wherein:
While the outfan of described second error amplifier connects the outfan of described park mode control circuit, by second Compensation circuit is grounded.
7. four pipe converter control circuits according to claim 1 are it is characterised in that described switch controlling signal produces electricity Road includes:Second comparator, the 3rd comparator, forward bias power supply and logic circuit, wherein:
The positive input of described second comparator is connected with the outfan of described current compensation circuit by forward bias power supply, The reverse input end of described second comparator receives sawtooth signal with the reverse input end of described 3rd comparator simultaneously, described The positive input of the 3rd comparator is connected with the outfan of described current compensation circuit, and described logic circuit is simultaneously with described The outfan of two comparators and the 3rd comparator is connected, and receives clock signal simultaneously.
8. a kind of four pipe changer light load control methods, are applied to four pipe converter control circuits it is characterised in that including:
Receive output voltage feedback signal and reference voltage signal;
The described output voltage feedback signal receiving and reference voltage signal are carried out application condition and compensation, obtains voltage and mend Repay signal;
Judge whether the voltage compensation signal obtaining is less than low pincers voltage set in advance;
If so, send low level signal, described four pipe converter control circuits enter park mode, and protect using duty cycle information Hold circuit and keep duty cycle information, wherein, keep duty cycle information to be specially using duty cycle information holding circuit:By electric current Compensation circuit receives described voltage compensation signal and inductive current average value signal, carries out application condition and compensation, produces electric current Thermal compensation signal;Described duty cycle information holding circuit keeps duty by keeping described current compensation signal in the hibernation mode Compare information;
Otherwise, send high level signal, described four pipe converter control circuits enter normal mode of operation.
9. a kind of four pipe changers are it is characterised in that include four pipe convertor controls electricity described in claim 1-7 any one Road.
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