CN105610306A - Secondary feedback control method and secondary feedback control circuit - Google Patents
Secondary feedback control method and secondary feedback control circuit Download PDFInfo
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- CN105610306A CN105610306A CN201610115133.2A CN201610115133A CN105610306A CN 105610306 A CN105610306 A CN 105610306A CN 201610115133 A CN201610115133 A CN 201610115133A CN 105610306 A CN105610306 A CN 105610306A
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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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 relates to a switching power supply controller, in particular to a magnetically isolated secondary feedback control method and control circuit, aims at solving the technical problems of an existing switching power supply in feedback control, and provides the secondary feedback control circuit, which is suitable for an isolated converter comprising a primary circuit formed by a primary winding of a transformer and a secondary circuit formed by a secondary winding of the transformer. The secondary feedback control circuit comprises a secondary modulating and transmitting module and a primary receiving and demodulating module, wherein the secondary modulating and transmitting module is used for carrying out digital sampling on an output voltage of the secondary circuit to obtain a digital signal of representing secondary sampling information, modulating the digital signal into an output voltage to generate a modulated voltage at a demagnetizing stage, and transmitting the modulated voltage acting on the secondary winding of the transformer; and the primary receiving and demodulating module can detect the modulated voltage through a primary auxiliary winding which is proportional to the secondary winding in voltage, and decodes and restores the digital signal transmitted on the primary side.
Description
Technical field
The present invention relates to switch power controller, particularly secondary feedback and the control circuit of magnetic isolation.
Background technology
For fear of load, to interference and destruction for electrical input, isolation type switch power converter has become various confessionsIndispensable part in electric system. Should realize isolation between output voltage and input voltage again output voltage stabilizationIn setting value, must need to adopt isolating device that the size of output voltage is fed back to input one side and regulate control. Fig. 1 isConventional secondary feedback control technology, the isolation that the task of isolation feedback is made up of device TL431, optocoupler and additional device is amplifiedDevice is born. General principle is: the trsanscondutance amplifier of the element compositions such as TL431 and sampling resistor R1, R2 is output voltage and baseThe error voltage signal of accurate voltage is enlarged into current signal, and the electric current that flows through TL431 in the time that output voltage is higher becomes large, namelyThe electric current that flows through optocoupler becomes large, the voltage decreases of controller FB port, thus controller output duty cycle diminishes and makes transformerTransmit less energy to secondary output, output voltage starts to reduce; Otherwise, if output voltage is on the low side, by error is believedNumber feed back to former limit and control the increase of dutycycle and increase the transmitting energy of transformer, thereby improve output voltage. So repeatedlyConstantly regulate and control output voltage stabilization in setting value. This feedback technique because of its detect and comparing element at converterSecondary, i.e. load one side, so be called secondary feedback. The mode of this direct-detection output voltage has the spy that precision is highPoint, but because the existence of these detections, amplifier, isolation feedback device has increased the space of power-supply system plate, obviously becomingOriginally and on volume there is no advantage. Particularly optocoupler can not at high temperature be worked, and is easy to agingly, makes high temperature longevity of this power supplyOrder shortly, cannot meet the application of some high temperature.
Former limit feedback (PSR) technology is developed rapidly in recent ten years, because it does not have above-mentioned secondary feedback deviceThere is cheap feature, be applied in large quantities the fields such as LED illumination and charger for mobile phone. Its schematic diagram as shown in Figure 2, closesThe work wave of key node as shown in Figure 3, GATESignal is that (" main limit " is transformer for the drive waveforms of main limit power MOSFET tube" former limit ", two word synonyms), iPTransformer primary winding NPCurrent waveform, iSTransformer secondary winding NSCurrent waveShape, VAThe auxiliary winding N of transformerAVoltage waveform. Operation principle is: in voltage and the transformation of auxiliary winding NA of demagnetization stageNS is proportional for device secondary winding, and the voltage of NS becomes definite relation with output voltage, thereby just can by the voltage of sampling VAThe size of output voltage detected, carry out duty ratio modulation according to the voltage detecting, if the higher duty that reduces of output voltageRatio, if the output voltage dutycycle that increases on the low side makes output voltage stabilization in setting value. Therefore planting feedback system detects and comparesLink is on the former limit of converter, i.e. input voltage one side, so be called former limit feedback. It is actual is by main power transformerRealize the feedback of output voltage to former limit, do not have above-mentioned secondary to feed back such detection feedback element, cost and volume advantageOutstanding. But it can not complete and replace traditional secondary feedback technique, because it has self intrinsic shortcoming---output electricityPressure precision is low. As shown in Figure 3, in the time that demagnetization just starts, the voltage of winding NA isItsMiddle nA is the number of turn of winding NA, and nS is the number of turn of winding NS, and VOUT is output voltage, and VBE is the knot pressure drop of diode, and Vr is secondaryLimit demagnetization peak point current iSP is in the upper pressure drop producing of dead resistance (comprise diode internal resistance, walk line resistance, electric capacity ESR resistance).Visible, because Vr is that the parameter changing and be subject to device changes greatly, before demagnetization finishes, VA can not accurately feed back outputThe size of voltage. Certainly, also can adopt conventional flex point sample mode, the voltage VA0 of the NA that samples in the time that demagnetization finishes soon,Now secondary erasing current is little of negligible, and Vr has not also just taken into account. So,1., the impact of VBE so far, the raising of feedback accuracy still can be subject to the restriction of three aspects::, it varies with temperature greatly; 2., nA andThe ratio of nS, the precision that can control is aborning also limited; 3., sampling precision, not every sample circuit all samplesVoltage when demagnetization has just finished, but in its vicinity. So former limit feedback control technology is in high the answering of output voltage required precisionWith in be restricted. Further, the application during the battery of mobile phone getting up in latest development fills soon is also restricted, because fill soon needsSelect output voltage according to charge condition at secondary, and the output voltage of former limit feedback is to be determined by the parameter on former limit, can notChange by control at secondary.
Summary of the invention
The object of the invention is the technical problem running in order to solve existing Switching Power Supply in FEEDBACK CONTROL, propose oneThe method of kind brand-new secondary feedback, it is applicable to have the former limit circuit that formed by the former limit winding of transformer and transformerThe isolated converter of the secondary circuit that secondary winding forms,
Adopt voltage communication mode, comprise the steps,
Secondary modulation, forwarding step, carry out digital sample to the output voltage of secondary circuit, then this data signal disappearedThe magnetic stage is modulated to and on output voltage, produces modulated voltage, and this modulated voltage is acted on to transformer secondary winding sends outSend;
Former edge joint is received, demodulation step, can detect modulated by the auxiliary winding in former limit proportional to secondary winding voltageVoltage, reduces transmitted digital signal decoding on former limit.
The carry system code that described data signal forms after referring to output voltage being quantized, the size of its projection output voltage;
Described modulated voltage refers to that the transformer demagnetization stage acts on the voltage on secondary winding, the Changing Pattern of this voltageCarrying the information of described data signal.
Described modulation refers to data signal corresponding one by one with the Changing Pattern of modulated voltage, in digital communication theoryThe digital information that the Changing Pattern of carrier wave is comprising transmission is the same.
Further, the present invention proposes a kind of secondary feedback switch supply convertor according to described secondary feedback method,This Switching Power Supply is according to the size of output voltage, and the size that optionally superposes on output voltage is easy to auxiliary on former limitThe control voltage that winding detects, and the voltage after stack is acted on to Switching Power Supply secondary winding in the demagnetization stage. Meanwhile, disappearingThe magnetic stage is detected former limit proportional to secondary winding and assists winding voltage, just can perception and judge this control that whether superposeedVoltage, because whether superpose this, to control voltage be according to the size of output voltage and fixed, thereby can be on the former limit of Switching Power SupplyJudge the size of output voltage, more just can be output voltage stabilization in setting value according to the output of judged result modulation duty cycle.
For realizing above-mentioned functions, the present invention propose Switching Power Supply comprise: three-winding transformer, it by main limit winding NP,These three winding compositions of secondary winding NS, auxiliary winding NA, they comprise respectively the first port and the second port; Secondary demagnetization electricityRoad, it comprises the first port and two ports of the second port; Output capacitance, it comprises the first port and two ends of the second portMouthful; Feedback switch, it comprises drain electrode port, source electrode port and three ports of gate port; Output voltage coding control module, itComprise the first port, the second port, three ports of the 3rd port; Detect judge module, it comprise the first port, the second port,The 3rd port, the 4th port, five ports of five-port; Auxiliary winding voltage detects upper resistance, and it comprises the first port and theTwo ports; Auxiliary winding voltage detects lower resistance, and it comprises the first port and the second port; Feedback switch state detection module,It comprises the first port and two ports of the second port; Output voltage decoding feedback module, it comprises the first port and the second endTwo ports of mouth; Duty ratio modulation circuit, it comprises the first port, the second port, three ports of the 3rd port.
The annexation of Switching Power Supply of the present invention is: the first port of described main limit winding NP and the anodal phase of input powerConnect, the second port is connected with the 3rd port of described duty ratio modulation circuit; The first port of described secondary winding NS, output electricityThe first port holding, the five-port that detects judge module are connected together, and tie point forms the positive pole of switch power source output voltagePort; The second port of described secondary winding NS, the first port of secondary degaussing circuit, the drain electrode port of feedback switch, detectionThe first port of judge module is connected together; The second port of described secondary degaussing circuit, the source electrode port of feedback switch, detectionThe 4th port of judge module, the second port of output capacitance are connected together, and tie point forms the negative of switch power source output voltageExtreme mouthful; The second port of described output voltage coding control module is connected with the second port that detects judge module; Described defeatedThe 3rd port that goes out voltage code control module is connected with the 3rd port that detects judge module; Described auxiliary winding voltage detectsThe first port of upper resistance is connected with the first port of described auxiliary winding NA; Described auxiliary winding voltage detects the of upper resistanceTwo ports, auxiliary winding voltage detect the first port of lower resistance, the first port phase together of feedback switch state detection moduleConnect; Together with the first port of the second port of described feedback switch state detection module and described output voltage decoding feedback moduleBe connected; The second port of described output voltage decoding feedback module is connected together with the first port of duty ratio modulation circuit; Account forEmpty than the second port of modulation circuit, the second port of the lower resistance of auxiliary winding voltage detection, the second port of auxiliary winding NABe connected together, tie point forms the negative pole end of input power.
The operation principle of Switching Power Supply of the present invention is as follows:
Described each cycle of detection judge module completes two tasks. First task is to detect output voltage and inner baseAccurate voltage compares and draws judged result, and result is passed to described output voltage coding-control by its second portModule; Second task is that the vacuum magnitude by detecting between its first port and the 4th port judges the demagnetization stage, andThe 3rd port of this information exchange being crossed to it passes to described output voltage coding control module.
Described output voltage coding control module completes two tasks in each cycle. First task is, according to receptionTo the judged result about output voltage size according to agreement communication protocol encode; Second task is, according to instituteState the conducting state of the designated time control feedback switch that is coded in the demagnetization stage.
The communication protocol of described agreement refers to, the switch power source output voltage sampling is compiled according to predetermined ruleNumber, in the decode procedure on former limit, give tacit consent to again this coding rule, object is whether can judge output voltage higher or on the low side.Concrete Code And Decode process can be understood by the detailed explanation of embodiment.
The designated time in described demagnetization stage refers to, it is moving that secondary feedback switch approximately fixes on certain moment or the period in demagnetization stageDo, the detection module on former limit this predetermined time section sense that this action just thinks effective.
Described conducting state is to show feedback switch suitable driving voltage makes it be operated in high resistance area or low-resistance region, high resistantBe relative with low-resistance instead of set absolute boundary, their difference is only the control voltage energy that feedback switch producesThe no variation of surveying and correctly judge its resistance state at former frontier inspection.
Described secondary degaussing circuit in the transformer secondary winding demagnetization stage in conducting state, for the energy storage of transformer is givenOutput capacitance charging provides path; In high-impedance state, prevent that the electric charge of output capacitance from pouring in down a chimney in the non-demagnetization stage.
The function that described feedback switch state detection module is realized is to pass through auxiliary in the designated time in described demagnetization stageThe sample voltage of auxiliary winding of the dividing potential drop that winding voltage detects upper and lower resistance, and the voltage of current detection with adopt beforeSample to voltage compare, whether exceeded setting value and judged the conducting state of feedback switch according to the amplitude of variation of voltageWhether change, judge the change direction of feedback switch conducting state according to the change direction of voltage. The electricity, detectingPress the amplitude increasing to exceed setting value, think that feedback switch has jumped to high-impedance state from low resistance state; Otherwise, the voltage detectingThe amplitude reducing exceedes setting value, thinks that feedback switch has jumped to low resistance state from high-impedance state. Then, this module is resistance stateChange information passes to described output voltage decoding feedback module by its second port.
The communication protocol that described output voltage decoding feedback module receives after resistance state change information is more according to a preconcerted arrangement carried outDecoding, it is higher or on the low side judging output voltage. If the result of this cycle decoder is that " switch power source output voltage is higher", reduce gradually this modulation voltage, until there is " switch power source output voltage is on the low side "; Otherwise, if current decodingResult be " switch power source output voltage is on the low side ", increase gradually this modulation voltage, until there is " Switching Power Supply output electricityPress higher " till.
Described duty ratio modulation circuit receives the modulation voltage of output voltage decoding feedback module output, and according to this voltageThe dutycycle of size modulations transformer primary winding NP excitation, modulation voltage increase increases dutycycle, otherwise reduces to account forEmpty ratio.
In sum, the FEEDBACK CONTROL simplification process of Switching Power Supply of the present invention is: secondary sampling and outputting voltage → coding→ change → former frontier inspection is surveyed the resistance state variation → voltage modulated dutycycle of decoding → produce to control feedback switch resistance state. Visible, it bothDo not need optocoupler not need other extra isolation transmitter part yet, thereby not only avoid these devices itself to bringSome inherent shortcomings, can be unpromising yet auxiliary these device work and the device that adds reduces volume and cost, can not simultaneously yetThere is the low problem with can not change at secondary output voltage by control of output voltage precision of former limit feedback technique. Make bodyLong-pending, cost, performance arrive optimization, and the scope of application is wider.
Brief description of the drawings
Fig. 1 is the typical application circuit figure of traditional secondary feedback switch converter;
Fig. 2 is the typical application circuit figure of traditional former limit feedback switch converter;
Fig. 3 is the key node working waveform figure of traditional former limit feedback switch converter;
Fig. 4 is the theory diagram of the secondary feedback switch converter of first embodiment of the invention;
Fig. 5 is the key signal oscillogram of the secondary feedback switch converter of first embodiment of the invention;
Fig. 6 is the theory diagram of the secondary feedback switch converter of second embodiment of the invention;
Fig. 7 is the theory diagram of the secondary feedback switch converter of third embodiment of the invention;
Fig. 8 is third embodiment of the invention secondary feedback switch converter key node work wave;
Fig. 9 is the theory diagram of the secondary feedback switch converter of fourth embodiment of the invention.
Detailed description of the invention
The improvement of having done with respect to prior art in order to understand better the present invention, to of the present invention three kinds concrete realBefore the mode of executing is elaborated, the prior art of first background technology part being mentioned is illustrated by reference to the accompanying drawings, and thenDraw the inventive concept of this case.
As shown in Figure 1, for existing traditional secondary feedback switch converter, for transformer isolation converter, comprise transformationFormer limit winding NP, secondary winding NS and the auxiliary winding NA of device, form the former of switch converters by the former limit winding NP of transformerLimit circuit, the secondary winding NS of transformer forms the secondary circuit of switch converters, and the task of this secondary feedback is by optocoupler and auxiliaryHelp the isolated amplifier of device composition to bear. The mode of this direct-detection output voltage has the advantages that precision is high, stillBecause the existence of these detections, amplifier, isolation feedback device has increased the space of power-supply system plate, obviously at cost and volumeOn there is no advantage. Particularly optocoupler can not at high temperature be worked, and is easy to agingly, makes the high temperature service life of this power supply short, nothingMethod meets some high temperature application.
The specific embodiment of the present invention, feeds back existing problems for light-coupled isolation of the prior art exactlyThe improvement of having done. Basic improvement thinking of the present invention is, removes optocoupler, by the former and deputy polygonal voltage communication technology, carry out everyFrom feedback transmission.
Initial scheme of the present invention is that a kind of secondary feedback, is applicable to have the former limit winding by transformerThe isolated converter of the secondary circuit that the former limit circuit forming and the secondary winding of transformer form,
Adopt voltage communication mode, comprise the steps,
Secondary modulation, forwarding step, carry out digital sample to the output voltage of secondary circuit and obtain characterizing secondary sampling letterThe data signal of breath, then this data signal was modulated to and on output voltage, produces modulated voltage in the demagnetization stage, and this is modulatedVoltage acts on transformer secondary winding and sends;
Former edge joint is received, demodulation step, can detect modulated by the auxiliary winding in former limit proportional to secondary winding voltageVoltage, reduces transmitted digital signal decoding on former limit.
Design thus, further refinement secondary modulation, sending method, comprise the steps,
Secondary sampling step, carries out digital sample to the output voltage of secondary circuit, obtain representing secondary output voltage withTwo data signals of the comparison judged result of internal reference voltage, and by digital data transmission to coding control module;
Coding-control step, receiving digital signals, and according to default coding rule, two data signal correspondences are compiled asHigh and low two kinds of level signals, export to compression module;
Pressurization steps, accepts level signal, and works in two states according to two kinds of level signal control pressurizer correspondences, withSecondary sampled signal is added on output voltage with voltage signal form.
In described pressurization steps, two kinds of resistance states of two kinds of corresponding work of level signal control pressurizer, are
In the time that pressurizer works in the first resistance state, produce the first voltage signal, with by the first numeral of secondary sampled signalSignal, with the first voltage signal form of pressurizer, is added on output voltage, produces modulated voltage, and this modulated voltage effectSend in transformer secondary winding;
In the time that pressurizer works in the second resistance state, produce second voltage signal, with by the second numeral of secondary sampled signalSignal, with second voltage signal form, is added on output voltage, produces modulated voltage, and this modulated voltage is acted on to transformerSecondary winding sends; Make the second judging result signal of output voltage with output voltage synchronous transfer.
Conceived by aforementioned techniques, further the former edge joint receipts of refinement, demodulation method, comprise the steps,
Former limit detecting step, within the scheduled time in demagnetization stage, samples to the terminal voltage of the auxiliary winding in former limit,To with the induced voltage of the proportional relation of modulated voltage as former limit sampled signal, and from induced voltage, extract secondary adjustSystem, the secondary sample information consequential signal as a comparison sending, and comparative result is exported to decoding control module;
Step is controlled in decoding, receives the compare result signal of former limit sampling, according to default coding rule, by compare result signalBe reduced to level signal, export to duty ratio modulation circuit.
Further the former edge joint receipts of optimization, demodulation method scheme are, in the detecting step of described former limit, from induced voltage, to extractThe secondary sample information that go out secondary modulation, sends is that current former limit sampled voltage signal and former limit sampled voltage are before believedNumber compare, whether exceed setting value according to the amplitude of variation of voltage and judge whether the conducting state of pressurizer changesBecome, and judge the change direction of pressurizer conducting state according to the change direction of voltage.
Each step in above method, the modularized circuit that all can be exchanged into corresponding function realizes.
Be a kind of secondary feedback control circuit, be applicable to there is the former limit circuit and the change that are formed by the former limit winding of transformerThe isolated converter of the secondary circuit that the secondary winding of depressor forms, comprises,
Secondary modulation, sending module, carry out digital sample to the output voltage of secondary circuit and obtain characterizing secondary voltage letterThe data signal of breath, then this data signal was modulated to and on output voltage, produces modulated voltage in the demagnetization stage, and this is modulatedVoltage acts on transformer secondary winding and sends;
Former edge joint is received, demodulation module, can detect modulated by the auxiliary winding in former limit proportional to secondary winding voltageVoltage, reduces transmitted digital signal decoding on former limit.
Wherein, secondary modulation, sending module, comprise,
Secondary detects judge module, and the output voltage of secondary circuit is carried out to digital sample, obtains representing secondary output electricityPress and two data signals of the comparison judged result of internal reference voltage, and by digital data transmission to coding control module;
Coding control module, receiving digital signals, and according to default coding rule, two data signal correspondences are compiled asHigh and low two kinds of level signals, export to compression module;
Compression module, accepts level signal, and works in two states according to two kinds of level signal control pressurizer correspondences, withSecondary sampled signal is added on output voltage with voltage signal form.
Further design compression module, is to be operated in two kinds of resistance states by two kinds of level signal control pressurizer correspondences,
In the time that pressurizer works in the first resistance state, produce the first voltage signal, with by the first numeral of secondary sampled signalSignal, with the first voltage signal form of pressurizer, is added on output voltage, produces modulated voltage, and this modulated voltage effectSend in transformer secondary winding;
In the time that pressurizer works in the second resistance state, produce second voltage signal, with by the second numeral of secondary sampled signalSignal, with second voltage signal form, is added on output voltage, produces modulated voltage, and this modulated voltage is acted on to transformerSecondary winding sends; Make the second judging result signal of output voltage with output voltage synchronous transfer.
The former edge joint of another design is received, demodulation module, comprise,
Former limit detection module, within the scheduled time in demagnetization stage, samples to the terminal voltage of the auxiliary winding in former limit,To with the induced voltage of the proportional relation of modulated voltage as former limit sampled signal, and from induced voltage, extract secondary adjustSystem, the secondary sample information consequential signal as a comparison sending, and comparative result is exported to decoding control module;
Decoding control module, receives the compare result signal of sampling in former limit, according to default coding rule, by compare result signalBe reduced to level signal, export to duty ratio modulation circuit.
The further former limit of design detection module, the secondary sample information that extract secondary modulation from induced voltage, sends,Be that current former limit sampled voltage signal and former limit sampled voltage signal are before compared, according to the amplitude of variation of voltage beThe no setting value that exceedes judges whether the conducting state of pressurizer changes, and judges pressurization according to the change direction of voltageThe change direction of device conducting state.
In order to make the present invention clearer, below in conjunction with drawings and Examples, the present invention is described in more detail.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention. Especially,In order to allow people be easier to understand the operation principle in the present invention, in cataloged procedure in an embodiment, logical relation has been used specificForm represent, for example " output voltage is higher " this information represents with " feedback switch is in high-impedance state ", in realityIn Realization of Product, " output voltage is higher " this information also can be carried with " feedback switch is in low resistance state ", is only for betterThe present invention is set forth on ground, instead of for limiting the present invention.
Embodiment mono-
According to isolation feedback method design of the present invention, the present embodiment provides a kind of transformer secondary voltage is fed back to formerThe device on limit, as shown in Figure 4, is a kind of secondary feedback switch converter, and it comprises four of secondary feedback control circuit of the present inventionIndividual control device: sampler, modulator, receiver and demodulator.
Sampler carries out digital sample to output voltage, and analog output voltage is converted into data signal to be passed;
Modulator the digital signal modulated that receives to output voltage and produce modulated voltage, at numeral letter to be passedNumber in the time of " 0 " state, make secondary winding in the first duty, and data signal to be passed make secondary in the time of one stateWinding is in the second duty, and these two kinds of different duties cause the voltage difference at secondary winding two ends, this changeThe voltage of changing is delivered to former limit winding by the coupling of transformer from secondary winding;
Receiver, by the detection to former limit winding voltage, perceives two kinds of different operating states that transformer transmits;
Demodulator restores and separates data signal according to the different operating state decode of receiver perception.
For more clearly setting forth the course of work, as shown in Figure 5, list secondary feedback switch converter of the present invention and closedThe signal waveform of key node, corresponding one by one with Fig. 4 of each signal name.
Bsend is data signal to be passed, and it is to output voltage V by samplerOUTSample and obtain; Vsend be throughModulated voltage after the modulation of ovennodulation device,, in the voltage difference at demagnetization stage secondary winding two ends, it is by numeral waiting for transmissionSignal is modulated and is formed on output voltage, i.e. modulated voltage Vsend=output voltage+Δ Vsend, and wherein, Δ Vsend is numeralThe modulation voltage of signal, is the added voltage of compression module, thus the full detail that makes modulated voltage comprise data signal;VA is the voltage signal that receiver receives on the auxiliary winding in former limit; Vrecv is receiver to the VA former frontier inspection obtaining of samplingSurvey signal, its size and the proportional relation of modulated voltage Vsend; Brecv is the data signal of solution that decoding restores, itTo be demodulator survey signal decoding according to former frontier inspection obtains, and the Brecv digital information expressed with Bsend is the same, be byIn only interval in time of transmission delay.
As shown in Figure 5, t1～t2, t3～t4, t5～t6 are the demagnetization stages, and data signal was transmitted in this stage.
In t1～t2 time period, data signal to be passed is " 0 ", and secondary winding is in the first duty, above itThe voltage Vsend Δ Vsend that do not superpose, the voltage that receiver receives is also the Δ Vrecv that do not superpose;
In t3～t4 time period, data signal to be passed is " 1 ", and secondary winding is in the second duty, above itVoltage Vsend be stack Δ Vsend, the voltage that receiver receives is also stack Δ Vrecv;
In t5～t6 time period, data signal to be passed is " 0 ", and secondary winding is in the first duty, above itVoltage Vsend be the Δ Vsend that do not superpose, the voltage that receiver receives is also the Δ Vrecv that do not superpose;
Decoder carries out demodulation according to the Vrecv signal receiving: thus do not find to change Brecv at t2 moment VrecvKeep original " 0 " digit order number; Change to height and amplitude exceeds setting value at t4 moment Vrecv voltage from low, think that state occursChange, thereby change to " 1 " digit order number from " 0 " digit order number; Exceed and establish to low and amplitude from hypermutation at t6 moment Vrecv voltageDefinite value, thinks that change has occurred state, thereby changes to " 0 " digit order number from " 1 " digit order number.
Visible, data signal to be passed " 010 ", the data signal of solution obtaining on former limit by transmission is also " 010 ".
Embodiment bis-
As shown in Figure 6, be the circuit diagram of the present embodiment Switching Power Supply, a kind of secondary feedback switch converter, it comprises: threeWinding transformer, it is made up of main limit winding NP, secondary winding NS, auxiliary these three windings of winding NA, and wherein winding NP comprisesThe first port 102 and the second port one 03, winding NS comprises the first port 104 and the second port one 05, and winding NA comprises first endMouth 106 and the second port one 07. Secondary modulator is made up of compression module and coding control module, and wherein, compression module, comprisesSecondary degaussing circuit and feedback switch, feedback switch is pressurizer, secondary degaussing circuit, it comprises the first port 110 andTwo 11 two of port ones ports; Output capacitance, it comprises the first port 131 and 32 two ports of the second port one; Feedback switch, itComprise drain electrode port, source electrode port and three ports of gate port. Output voltage coding control module, it comprises the first port112, the second port one 13,14 3 ports of the 3rd port one; Secondary sampler, adopts and detects judge module, and it comprises first endMouth 115, the second port one 16, the 3rd port one 17, the 4th port one 18,119 5 ports of five-port; Auxiliary winding voltage inspectionResistance in survey, it comprises the first port 120 and the second port one 21; Auxiliary winding voltage detects lower resistance, and it comprises the first port122 and second port one 23; Feedback switch state detection module, it comprises the first port 124 and 25 two ports of the second port one;Output voltage decoding feedback module, it comprises the first port 126 and 27 two ports of the second port one; Duty ratio modulation circuit, itComprise the first port 128, the second port one 29,30 3 ports of the 3rd port one.
Their annexation is: port one 02 is connected with the positive terminal 101 of input power, port one 03 and port one 30 phasesConnect; Port one 04, port one 31, port one 19 are connected together, and tie point forms the anodal port 108 of switch power source output voltage; EndDrain electrode port, the port one 15 of mouth 105, port one 10, feedback switch are connected together; The source of port one 11, port one 18, feedback switchExtreme mouth, port one 32 are connected together, and tie point forms the negative pole port 109 of switch power source output voltage; Port one 13 and port116 are connected; Port one 14 is connected with port one 17; Port one 20 is connected with port one 06; Port one 21, port one 22, port one 24 are togetherBe connected; Port one 25 is connected together with port one 26; Port one 27 is connected together with port one 28; Port one 29, port one 23, port107 are connected together, and tie point forms the negative pole end of input power.
The excitation process of this flyback supply convertor is the same with classical inverse exciting converter, its difference be asWhere the demagnetization stage feeds back to former limit from secondary the change information of output voltage. Concrete operation principle is:
Detect two detection effect of judge module. The first, it passes through the output voltage of port one 19 sense switch power supplys, andThis voltage and inner reference voltage are compared, and result relatively can determine to feed back MOS switch in the transformer demagnetization stageWhether open-minded. The second, it detects by 110 ports and 111 ports, and the conduction voltage drop of demagnetization path realizes, on demagnetization rankPressure drop ratio port one 11 less of section port one 10.
Two effects of output voltage coding control module: Coding Effects, agreement coding rule---output voltage is from partiallyWhen high state changes to Lower state, feedback switch need change to low resistive state from high-impedance state, otherwise output voltage is from the low sideState variation during to higher state feedback switch need change to high-impedance state from low resistive state. So, it is anti-when output voltage is higherFeedback switch should be in high-impedance state, and feedback switch drive level is encoded as low level; When output voltage is on the low side, feedback switch should be locatedIn low resistance state, feedback switch drive level is encoded as high level. Control action, at demagnetization stage control feedback switch grid placeIn corresponding code level, port one 12 output low levels when output voltage is higher, when output voltage is on the low side, port one 12 is exportedHigh level.
The transmitting procedure of transformer: because there is output capacitance COUTThe existence of energy storage effect, converter is even several at oneIn cycle, output voltage is that larger sudden change can not occur, so can ignore at short notice capacitor COUTVoltage VOUTChangeChange. According to the present invention, content is known, now need to be at VOUTVoltage is controlled in one of upper stack, and we adopt rectification diode for this reasonAs secondary demagnetization path, as shown in Figure 6, this is to be the most also the most frequently used mode. Because the knot pressure drop V of diodeBE'sExist, when feedback MOS switch was not opened in the demagnetization stage, winding NSPort one 04 is (V with the pressure reduction minimum of a value of port one 05OUT+VBE); When feedback MOS switch was opened in the demagnetization stage, winding NSPort one 04 is (V with the pressure difference of port one 05OUT+Vsdon)，Wherein VsdonPressure reduction while being feedback MOS switch conduction between source electrode and drain electrode, because the internal resistance of feedback MOS switching tube is little,VsdonBe less than VBE. Visible, there is the pressure reduction at winding two ends with not conducting in the conducting of demagnetization stage feedback MOS switchLarge sudden change, by conversion, in port one 24 place's voltage change sizes of feedback switch state detection module is: WhereinIt is winding NA and the ratio of the winding NS number of turn.
The detection deterministic process of feedback switch state detection module: in order to allow people understand more intuitively this transmitting procedure,Designing particularly a supply convertor below sets forth. Select VBE=0.4V, feedback MOS switching tube conduction voltage drop Vsdon＝0.06V，Feed back so the conducting of MOS switching tube and not conducting, at port one, 24 places detectVoltage change be Δ V124=(0.4V-0.06V) × 3 × 0.2=0.2V. The voltage of each cycle detection port one 24, ifThe voltage in the previous cycle of voltage ratio that this cycle obtains exceeds setting value Δ Vref=0.1V, can judge feedback switchFrom low resistance state LRChange to high-impedance state HR; Otherwise, can judge feedback switch from high-impedance state HRChange to low resistance stateLR. In order to make this correct judgment errorless, ensure by following two requirements, first is exactly Δ Vref < Δ V124, alsoBe exactly that detection module can be judged this voltage jump; The secondth, the voltage of comparing is separated by periodicity can not be excessive, becauseThe short V that just can ignore of only timeOUTThe variation of voltage, avoids because of VOUTProduce erroneous judgement compared with large variation.
Decoding and duty ratio modulation process:, according to the coding rule of arranging in cataloged procedure, should about definite decoding rule be,In the time receiving the judged result of " feedback switch changes to low resistive state from high-impedance state ", correspondingly decode " output voltage fromHigher state variation is to Lower state ", otherwise, when receiving the judgement of " feedback switch changes to high-impedance state from low resistive state "When result, correspondingly decode " output voltage changes to higher state from Lower state ". If decoded result be " output voltage fromHigher state variation is to Lower state ", before showing to change, output voltage is higher, current output voltage is on the low side, straightTo again receiving contrary reverse state variation; Otherwise, can learn that current output voltage is higher. Visible, as long as pressThe communication protocol forming according to these two agreements is controlled and transmits, just can be the size of isolating transformer secondary output voltageFeed back its former limit. In the time that output voltage is higher, reduce gradually modulation voltage Vcrl, its control dutycycle reduces gradually, thereby causesOutput voltage is reduced; Otherwise, when output voltage is on the low side, increase gradually dutycycle it raise again. So repeatedly, outputVoltage stabilization is in setting value.
Embodiment tri-
As shown in Figure 7, be the circuit diagram of the present embodiment three, be there is no secondary demagnetization electricity with the difference of embodiment bis-Road and feedback switch, the substitute is rectification feedback switch, is the rectifying tube in traditional switch converter secondary circuit. WholeStream feedback switch comprises three ports, and the first port 233 is connected with the second port one 05 of secondary winding, and the second port 234 is with defeatedGo out voltage code control module the 3rd port one 12 and connect, the 3rd port 235 is connected with Switching Power Supply output negative pole end 109.
The working method of the rectification feedback switch in the present embodiment is, time period rectification feedback switch outside the demagnetization stageEnd, prevent that the electric charge in output capacitance from pouring in down a chimney; In the demagnetization stage, its duty changes, and is as shown in Figure 8The voltage waveform of auxiliary winding NA, open as transformer provides demagnetization path at T1 period rectification feedback switch, plays rectificationEffect. But determined by the size of output voltage in the conducting state of T2 period rectification feedback switch, play output voltage feedbackEffect, use as pressurizer. Assist the voltage waveform of winding NA as shown in curve in Fig. 81, if not open-minded if openElectric current can pass through from the body diode of feedback MOS switching tube, assists the waveform of winding as shown in curve 2, these two kinds of different worksThe state of doing has just defined two kinds of configurations, is used for carrying the information of output voltage size.
Summary of the invention according to the present invention is known, can transmit by the designated time variation of feedback switch resistance state. ExistingAgreement feedback switch state detection module detects winding voltage in the time that fast demagnetization finishes, and detects so at voltage curve 1 placeVoltage swing is V1, and the waveform detecting at voltage curve 2 places is V2. In fact the difference of voltage V2 and voltage V1 is that rectification is anti-The body diode pressure drop of feedback switch, state detection module is as long as the control voltage of this sudden change just can perceive the shape of feedback switchState, thus the size of output voltage learnt.
The coding of output voltage, decoding, this whole process of Duty ratio control have elaborated above, at this notRepeat again.
Embodiment tetra-
So far easily understand core of the present invention and be, the size information of output voltage is become by the resistance state of feedback switchChange and carry, auxiliary from isolating transformer secondary winding coupled to former limit of the control voltage that the variation of feedback switch resistance state producesHelp winding, perceive respective change on former limit and judge the size of output voltage, what controls dutycycle from and make output voltage steadyFixed. Be that feedback switch is as pressurizer. So, how to produce that in this, to control voltage be varied as the mode of information carrier, the circuit of the present embodiment is also good selection in some applications, as shown in Figure 9.
The difference of the present embodiment and embodiment bis-is, the feedback switch in compression module is connected with demagnetization path,The conducting state of controlling feedback switch also can produce required control voltage. Because degaussing circuit can cut voluntarily after demagnetization finishesThe electric charge that only prevents output capacitance pours in down a chimney, thereby the control of feedback switch is not needed to sample the demagnetization stage and reduces Switching Power SupplyRealize difficulty, this is its outstanding advantages.
Claims (10)
1. a secondary feedback, is applicable to have the former limit circuit and the transformer that are formed by the former limit winding of transformerThe isolated converter of secondary circuit that forms of secondary winding,
Adopt voltage communication mode, comprise the steps,
Secondary modulation, forwarding step, carry out digital sample to the output voltage of secondary circuit and obtain characterizing secondary voltage informationData signal, then this data signal was modulated to and on output voltage, produces modulated voltage in the demagnetization stage, and this modulated voltageActing on transformer secondary winding sends;
Former edge joint is received, demodulation step, modulated voltage can be detected by the auxiliary winding in former limit proportional to secondary winding voltage,On former limit, transmitted digital signal decoding is reduced.
2. secondary feedback according to claim 1, is characterized in that: described secondary modulation, forwarding step, bagDraw together following steps,
Secondary sampling step, carries out digital sample to the output voltage of secondary circuit, obtains representing that secondary output voltage is with innerTwo data signals of the comparison judged result of reference voltage, and by digital data transmission to coding control module;
Coding-control step, receiving digital signals, and according to default coding rule, two data signal correspondences are compiled as high and lowTwo kinds of level signals, export to compression module;
Pressurization steps, accepts level signal, and works in two states according to two kinds of level signal control pressurizer correspondences, with by pairLimit sampled signal is added on output voltage with voltage signal form.
3. secondary feedback according to claim 2, is characterized in that: in described pressurization steps, and two kinds of levelTwo kinds of resistance states of the corresponding work of signal controlling pressurizer, are
In the time that pressurizer works in the first resistance state, produce the first voltage signal, with by the first data signal of secondary sampled signalWith the first voltage signal form of pressurizer, be added on output voltage, produce modulated voltage, and this modulated voltage is acted on to changeDepressor secondary winding sends;
In the time that pressurizer works in the second resistance state, produce second voltage signal, with by the second data signal of secondary sampled signalWith second voltage signal form, be added on output voltage, produce modulated voltage, and this modulated voltage is acted on to transformer secondaryWinding sends; Make the second judging result signal of output voltage with output voltage synchronous transfer.
4. according to the secondary feedback described in any one in claims 1 to 3, it is characterized in that: described former edge joint receipts,Demodulation step, comprises the steps,
Former limit detecting step, within the scheduled time in demagnetization stage, samples to the terminal voltage of the auxiliary winding in former limit, obtain withThe induced voltage of the proportional relation of modulated voltage is as former limit sampled signal, and from induced voltage, extracts secondary modulation, sends outThe secondary sample information consequential signal as a comparison sending, and comparative result is exported to decoding control module;
Step is controlled in decoding, receives the compare result signal of former limit sampling, according to default coding rule, compare result signal is reducedFor level signal, export to duty ratio modulation circuit.
5. secondary feedback according to claim 4, is characterized in that: in the detecting step of described former limit, from senseAnswering the secondary sample information that extracts secondary modulation in voltage, sends, is former with before by current former limit sampled voltage signalWhether limit sampled voltage signal compares, exceed and set value the conducting shape that judges feedback switch according to the amplitude of variation of voltageWhether state changes, and judges the change direction of feedback switch conducting state according to the change direction of voltage.
6. a secondary feedback control circuit, is applicable to have the former limit circuit and the transformer that are formed by the former limit winding of transformerThe isolated converter of secondary circuit that forms of secondary winding, comprise,
Secondary modulation, sending module, carry out digital sample to the output voltage of secondary circuit and obtain characterizing secondary voltage informationData signal, then this data signal was modulated to and on output voltage, produces modulated voltage in the demagnetization stage, and this modulated voltageActing on transformer secondary winding sends;
Former edge joint is received, demodulation module, modulated voltage can be detected by the auxiliary winding in former limit proportional to secondary winding voltage,On former limit, transmitted digital signal decoding is reduced.
7. secondary feedback control circuit according to claim 6, is characterized in that: described secondary modulation, sending module, bagDraw together,
Secondary detect judge module, the output voltage of secondary circuit is carried out to digital sample, obtain representing secondary output voltage withTwo data signals of the comparison judged result of internal reference voltage, and by digital data transmission to coding control module;
Coding control module, receiving digital signals, and according to default coding rule, two data signal correspondences are compiled as high and lowTwo kinds of level signals, export to compression module;
Compression module, accepts level signal, and works in two states according to two kinds of level signal control pressurizer correspondences, with by pairLimit sampled signal is added on output voltage with voltage signal form.
8. secondary feedback control circuit according to claim 7, is characterized in that: described compression module, and by rectification two utmost pointsPipe and feedback switch form, and feedback switch is a N-type metal-oxide-semiconductor, and its concrete annexation is, the negative electrode of commutation diode and secondaryThe different name end of winding connects, and the anode of commutation diode is connected with output negative terminal; The grid of N-type metal-oxide-semiconductor and coding control moduleConnect, the drain electrode of N-type metal-oxide-semiconductor and the negative electrode of commutation diode connect, the source electrode of N-type metal-oxide-semiconductor and the anodic bonding of commutation diode,In order in the demagnetization stage, by the first data signal of secondary sampled signal, while working in the first resistance state with N-type metal-oxide-semiconductor, produceThe first voltage signal form, is added on output voltage; And by the second data signal of secondary sampled signal, work with N-type metal-oxide-semiconductorThe second voltage signal form producing in the time of the second resistance state, is added on output voltage.
9. secondary feedback control circuit according to claim 7, is characterized in that: described compression module, and by rectifying tube groupBecoming, is a N-type metal-oxide-semiconductor, and its concrete annexation is that the grid of N-type metal-oxide-semiconductor is connected with coding control module, N-type metal-oxide-semiconductorDrain electrode is connected with the different name end of secondary winding, the source electrode of N-type metal-oxide-semiconductor with export negative terminal and be connected, in order in the demagnetization stage, by secondaryThe first data signal of sampled signal, the first voltage signal form producing during with the conducting of N-type metal-oxide-semiconductor body diode, is added to defeatedGo out on voltage; And by the second data signal of secondary sampled signal, during with the not conducting of N-type metal-oxide-semiconductor body diode, produce secondVoltage signal form, is added on output voltage.
10. secondary feedback control circuit according to claim 7, is characterized in that: described compression module, by diode andP type metal-oxide-semiconductor composition, its concrete annexation is that the negative electrode of commutation diode is connected with the different name end of secondary winding, rectification two utmost pointsThe anode of pipe is connected with the drain electrode of P type metal-oxide-semiconductor,
The source electrode of P type metal-oxide-semiconductor is connected with output negative terminal, and the grid of P type metal-oxide-semiconductor is connected with coding control module,
In order in the demagnetization stage, by the first data signal of secondary sampled signal, during with the conducting of N-type metal-oxide-semiconductor body diode, produceThe first voltage signal form, be added on output voltage; And by the second data signal of secondary sampled signal, with N-type metal-oxide-semiconductor bodyThe second voltage signal form producing when not conducting of diode, is added on output voltage.
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