CN106208714A - Synchronous rectifying switching power source and control method - Google Patents
Synchronous rectifying switching power source and control method Download PDFInfo
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- CN106208714A CN106208714A CN201610642931.0A CN201610642931A CN106208714A CN 106208714 A CN106208714 A CN 106208714A CN 201610642931 A CN201610642931 A CN 201610642931A CN 106208714 A CN106208714 A CN 106208714A
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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
- H02M3/33569—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 having several active switching elements
- H02M3/33576—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 having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—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 having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0032—Control circuits allowing low power mode operation, e.g. in standby mode
-
- 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
- H02M1/0048—Circuits or arrangements for reducing losses
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
This application discloses synchronous rectifying switching power source and control method thereof.Described synchronous rectifying switching power source includes: transformator, including primary side winding and vice-side winding；Main switch, is connected in series with described primary side winding, and periodically turns on and disconnect so that described primary side winding transmits energy to described vice-side winding；Synchro switch pipe, is connected in series with described vice-side winding, and and disconnects according to identical cycle conducting with described main switch；Output capacitance, first end of described output capacitance is connected to described vice-side winding, second end is connected to described synchro switch pipe, wherein, the primary side winding of described transformator receives input voltage, and described output capacitance is charged by the vice-side winding of described transformator, thus in described output capacitance, produce output voltage, when underloading or zero load, disconnect the primary current path of described synchro switch pipe, and rely on parasitic diode to maintain the conducting state of described synchro switch pipe.This synchronous rectifying switching power source can reduce power consumption during underloading.
Description
Technical field
The present invention relates to switch power technology, more particularly, to synchronous rectifying switching power source and control method.
Background technology
The Switching Power Supply of primary-side-control can use the auxiliary winding of transformator to obtain the feedback letter relevant to output voltage
Number, thus can save for by feedback signal from secondary side feedback to electronic components such as the optocoupler on former limit and precision voltage sources, letter
Change signal feedback path.The Switching Power Supply of primary-side-control easily forms the integrated circuit of modularity and miniaturization, the most widely
For the various charge power supplies of mobile phone, panel computer and portable electronic device, and for driven for emitting lights diode (LED)
Power supply in.
In the Switching Power Supply of primary-side-control, the primary side winding of transformator connects main switch, and vice-side winding connects to be had
Commutation diode or synchro switch pipe.Commutation diode need not the control circuit added, thus circuit structure is simple.Rectification two
The shortcoming of pole pipe is that the voltage drop of self is relatively big, causes the power consumption of Switching Power Supply to increase, particularly at heavy duty High-current output
Under situation, the power consumption of whole Switching Power Supply dramatically increases.Synchro switch pipe can reduce the power consumption on rectifier cell, thus carries
The efficiency of high Switching Power Supply.Synchro switch pipe needs to work asynchronously with main switch, could be electric for the output that load offer is stable
Pressure.Accordingly, it would be desirable to provide additional secondary control circuit for synchro switch pipe.But, secondary control circuit also can produce self
Power consumption, particularly when underloading, secondary control circuit still works, proportion in the power consumption of whole Switching Power Supply
Too high.
Therefore, it is desirable to improve circuit structure and the control mode of synchronous rectifying switching power source further, to reduce switch electricity
The stand-by power consumption in source.
Summary of the invention
In view of this, it is an object of the invention to provide a kind of synchronous rectifying switching power source and control method, Qi Zhongtong
Cross detection switch periods to disconnect synchronizing chip, to reduce the stand-by power consumption of Switching Power Supply.
According to the first aspect of the invention, it is provided that a kind of synchronous rectifying switching power source, including transformator, including former limit around
Group and vice-side winding；Main switch, is connected in series with described primary side winding, and periodically turns on and disconnect so that described
Primary side winding transmits energy to described vice-side winding；Synchro switch pipe, is connected in series with described vice-side winding, and with described master
Switching tube is according to identical cycle conducting and disconnects；Output capacitance, the first end of described output capacitance be connected to described secondary around
Group, the second end is connected to described synchro switch pipe；Primary-side-control circuit, for producing the first driving signal to control main switch
Conducting state；And secondary control circuit, for producing the two driving signal conducting state with control synchro switch pipe, its
In, the primary side winding of described transformator receives input voltage, and described output capacitance is charged by the vice-side winding of described transformator, from
And in described output capacitance, produce output voltage, when underloading or zero load, described secondary control circuit disconnects described synchronization and opens
Close the primary current path of pipe, and rely on parasitic diode to maintain the conducting state of described synchro switch pipe.
Preferably, when underloading or zero load, described primary-side-control circuit regulation described first drives the switch periods of signal,
To maintain described output voltage constant.Herein, term " constant " represents output voltage not absolute constancy but can
To fluctuate in certain scope.
Preferably, described primary-side-control circuit and described secondary control circuit include load detecting module, respectively for root
According to described first drive in signal and described two driving signal at least one judge whether to be in light condition.
Preferably, during described load detecting module detects described first driving signal and described two driving signal at least
One of switch periods, and judge load condition according to described switch periods, if described switch periods is more than or equal to predetermined
Value, then judge to be in light condition, if described switch periods is less than described predetermined value, then judges to be in normal load state.
Preferably, the first square-wave signal is carried out point under the control of the second pulse-width signal by described load detecting module
Frequency meter number, thus judge whether described switch periods is more than predetermined value, described secondary control circuit is adjusted according to described second pulsewidth
Signal processed produces described two driving signal.
Preferably, described load detecting module includes: multiple first triggers, is serially connected into frequency division counter electricity
Road, the plurality of first trigger receives described first square-wave signal, and provides multiple first output signal；First and door,
Including the first input end for receiving overall situation enable signal, for receiving the second input of the second square-wave signal, Yi Jiti
For the outfan of the second output signal, described second output signal is used for enabling the plurality of first trigger；Second and door, bag
Include the multiple inputs for receiving the plurality of first output signal, and the outfan of the 3rd output signal is provided；And
Second trigger, including for receiving the first input end of described 3rd output signal and for receiving described second pulsewidth modulation
Second input of signal, and the outfan of output control signal is provided, wherein, described second square-wave signal is described second
The delay signal of pulse-width signal, described output control signal is for controlling the output of described two driving signal.
Preferably, described primary-side-control circuit includes: the first comparator, anti-for the voltage that will characterize described output voltage
Feedback signal and the first reference voltage compare, to produce the discharge time signal of vice-side winding；Second comparator, for by described
Voltage feedback signal and the second reference voltage compare, to produce error signal；Constant current loop back control module, for according to described
Discharge time signal produces the first Continuity signal；Constant voltage loop back control module, leads for producing second according to described error signal
Messenger；3rd comparator, for flowing through the current sampling signal and the 3rd of the electric current of described main switch with reference to electricity by sign
Pressure compares, to produce cut-off signal；First logic control circuit, for according to described first Continuity signal, described second lead
Messenger and described cut-off signal produce the first pulse-width signal；And first grid drive circuit, for according to described the
One pulse-width signal produces described first and drives signal；And the first load detecting module, for according to described first pulsewidth
Modulated signal produces airborne signals, and wherein, described primary-side-control circuit regulates described second reference voltage according to airborne signals, from
And regulate the described first switch periods driving signal.
Preferably, also include: line loss adjusting module, for producing line loss compensation signal according to described airborne signals；And
Output line loss compensating module, for producing described second reference voltage according to described line loss compensation signal.
Preferably, described secondary control circuit includes: the 4th comparator, for by the terminal voltage of described vice-side winding and the
Four reference voltages compare, to produce the 3rd Continuity signal；5th comparator, for by described terminal voltage and the 5th reference voltage
Compare, to produce the second cut-off signal；Second logic control circuit, for according to described 3rd Continuity signal and described second
Cut-off signal produces the second pulse-width signal；Second grid drive circuit, for producing according to described second pulse-width signal
Raw described two driving signal；And the second load detecting module, for producing output according to described second pulse-width signal
Control signal, wherein, described first grid drive circuit provides described second to drive under the control of described output control signal
Signal.
According to the second aspect of the invention, it is provided that the control method of a kind of synchronous rectifying switching power source, including: use first
Drive signal, periodically turn on and disconnect the main switch connected with primary side winding so that from the primary side winding of transformator to
The vice-side winding transmission energy of transformator；Use two driving signal, periodically turn on and disconnect and connect with vice-side winding
Synchro switch pipe, charges to output capacitance, thus provides output voltage in output capacitance；Wherein, when underloading or zero load, disconnected
Open the primary current path of described synchro switch pipe, and rely on the parasitic diode of described synchro switch pipe to maintain described synchronization to open
Close the conducting state of pipe.
Preferably, when underloading or zero load, driven the switch periods of signal by regulation described first, maintain described output
Voltage constant.
Preferably, according to described first drive in signal and described two driving signal at least one judge whether to be in
Light condition.
Preferably, it may be judged whether the step being in light condition includes: detect described first and drive signal and described second
Drive in signal at least one switch periods；And judge load condition according to described switch periods, wherein, if described
Switch periods is more than or equal to predetermined value, then judge to be in light condition, if described switch periods is less than described predetermined value, then sentence
Surely normal load state it is in.
Preferably, judge that the step of load condition includes according to described switch periods: in the control of the first pulse-width signal
Under system, the first square-wave signal is carried out frequency division counter, thus judges that whether described switch periods is more than predetermined value.
Preferably, also include: produce airborne signals according to detection；And drive letter according to airborne signals regulation described first
Number switch periods.
Preferably, judge that the step of load condition includes according to described switch periods: in the control of the second pulse-width signal
Under system, the first square-wave signal is carried out frequency division counter, thus judges that whether described switch periods is more than predetermined value.
Preferably, also include: produce output control signal according to detection；Institute is produced according to described second pulse-width signal
State two driving signal；And use described output control signal to control the output of described two driving signal.
Synchronous rectifying switching power source according to embodiments of the present invention, the switch periods of detection Switching Power Supply, and limit is set
Frequency point processed.When the switch periods of Switching Power Supply is more than setting value, disconnect synchronous rectification chip, during such that it is able to reduce underloading
Secondary power consumption.
In a preferred embodiment, the testing result according to switch periods on former limit, regulate switch periods.Work as Switching Power Supply
Switch periods more than setting value time, increase line loss magnitude of recruitment.Due to the compensation on former limit, i.e. example synchronous rectification diode is from main electricity
The state of flow path conducting switches to and utilizes parasitic diode turn on, also can the change of compensating sampling pressure reduction, maintenance output voltage
Constant.
Therefore, the present invention, when underloading or zero load, can reduce the power consumption of synchronous rectification chip, and not to reduce output
Voltage is cost, thus solves prior art in synchronous rectification contradiction between PSR efficiency and power consumption.
Accompanying drawing explanation
By description to the embodiment of the present invention referring to the drawings, above-mentioned and other purposes of the present invention, feature and
Advantage will be apparent from, in the accompanying drawings:
Fig. 1 illustrates the schematic circuit of synchronous rectifying switching power source.
Fig. 2 and 3 is shown respectively according to the primary controller used in the Switching Power Supply of prior art and secondary controller
Schematic circuit.
Figure 4 and 5 are shown respectively in Switching Power Supply according to embodiments of the present invention the primary controller and secondary control used
The schematic circuit of device processed.
Fig. 6 illustrates the schematic circuit of the load detecting module used in Switching Power Supply according to embodiments of the present invention.
Fig. 7 illustrates the working waveform figure of Switching Power Supply according to embodiments of the present invention.
Detailed description of the invention
It is more fully described the present invention hereinafter with reference to accompanying drawing.In various figures, it is attached that identical element employing is similar to
Figure labelling represents.For the sake of clarity, the various piece in accompanying drawing is not necessarily to scale.Furthermore, it is possible to not shown some
Known part.
Describe hereinafter the many specific structure of details, such as device, material, size, place's science and engineering of the present invention
Skill and technology, in order to be more clearly understood that the present invention.But the most as the skilled person will understand, can not press
The present invention is realized according to these specific details.
The present invention can present in a variety of manners, some of them example explained below.
Fig. 1 illustrates the schematic circuit of synchronous rectifying switching power source.This Switching Power Supply 100 includes transformator T1, is positioned at
The main switch M1 on the former limit of transformator T1, current sampling resistor Rs, voltage feedback circuit, primary-side-control circuit 101, be positioned at change
The synchro switch pipe M2 of the secondary of depressor T1, output capacitance C1, secondary control circuit 112.
On the former limit of transformator T1, the primary side winding of transformator T1, main switch M1 and current sampling resistor Rs connect successively
Be connected on Switching Power Supply input VI and between.Intermediate node between main switch M1 and current sampling resistor Rs obtains stream
Current sampling signal VS through the electric current of main switch M1.The auxiliary winding of transformator T1 is connected with voltage feedback circuit,
In this example, voltage feedback circuit includes the potential-divider network being made up of resistance R1 and R2.Middle node between resistance R1 and R2
Feedback signal VFB of the secondary voltage of some acquisition transformator T1.Two inputs of primary-side-control circuit 101 receive electric current respectively
Sampled signal VS and voltage feedback signal VFB, and the driving signal VG1 of main switch M1 is provided at outfan.
At the secondary of transformator T1, the vice-side winding of transformator T1 is connected in parallel with output capacitance C1, transformator T1's
Between vice-side winding and output capacitance C1, connect and have synchro switch pipe M2.One end of output capacitance C1 is connected to high potential output
End VO, other end ground connection.Secondary control circuit 112 is from vice-side winding receiving port voltage VD, and provides synchronization at outfan
The driving signal VG2 of switching tube M2.
During the work of Switching Power Supply, primary-side-control circuit 101 controls main switch M1 according to current sampling signal VS
The disconnection moment, the switch periods controlling main switch M1 according to voltage feedback signal VFB, thus realize constant current and/or constant voltage
Output.Secondary control circuit 112 controls the startup of synchro switch pipe M2 according to port voltage VD and disconnects the moment so that open main
Closing at least some of time during the disconnection of pipe M1, synchro switch pipe M2 turns on.Main switch M1's and synchro switch pipe M2
Switch periods is identical.
During the conducting of main switch M1, the primary current IP that the primary side winding of transformator T1 flows through is transformator T1's
Vice-side winding induces secondary current IS.After secondary current IS flows through synchro switch pipe M2, one part of current is to output capacitance
C1 charging produces output voltage VO UT, and another part electric current is as output current IO.
Fig. 2 and 3 is shown respectively according to the primary controller used in the Switching Power Supply of prior art and secondary controller
Schematic circuit, wherein, primary-side-control circuit 101 and secondary control circuit 112 are such as the Switching Power Supply shown in Fig. 1
In.
Primary-side-control circuit 101 has two inputs, receives voltage feedback signal VFB and current sampling signal respectively
VS, and outfan, for providing the driving signal VG1 of main switch.Further, primary-side-control circuit 101 includes first
Comparator 102, error amplifier 103, output line loss compensating module 104, constant current loop back control module 105, constant voltage loop control
Module the 106, second comparator 107, logic control circuit 108 and gate driver circuit 109.
The in-phase input end of the first comparator 102 receives voltage feedback signal VFB, and inverting input receives reference voltage
VREF1.First comparator 102 detects between the high period of voltage feedback signal VFB, thus obtains the discharge time of vice-side winding
Signal TD.The outfan of the first comparator 102 provides described discharge time signal TD.
The in-phase input end of error amplifier 103 receives voltage feedback signal VFB, and inverting input receives reference voltage
VREF2.This reference voltage VREF2 is regulated according to the size of output loading by exporting line loss compensating module 104.Error amplifier
The outfan of 103 provides error signal EAOUT.
Constant current loop back control module 105 obtains the first Continuity signal ONC according to discharge time signal TD, and constant voltage loop controls
Module obtains the second Continuity signal ONV according to error signal EAOUT.The in-phase input end of the second comparator 107 receives with reference to electricity
Pressure VREF3, inverting input receives current sampling signal VS, and provides cut-off signal OFF at outfan.
Logic control circuit 108 receives above-mentioned the first Continuity signal ONC, the second Continuity signal ONV and cut-off signal
OFF, generates pulse-width signal PWM1 after processing.Gate driver circuit 109 promotes driving force further to produce
The driving signal VG1 of main switch M1.
During the work of Switching Power Supply 100, primary-side-control circuit 101 controls main switch M1 when system electrification leads
Logical so that the primary current IP flowing through main switch M1 is gradually increased.Correspondingly, the voltage drop on current sampling resistor RS, i.e.
The level of current sampling signal VS increases.The second comparator 107 in primary-side-control circuit 101 is by current sampling signal VS
Compared with reference voltage VREF3.When current sampling signal reaches reference voltage VREF3, the outfan of the second comparator 107
Cut-off signal OFF effective so that the upset of the level of the pulse-width signal PWM1 of logic control circuit 108 is low level, grid
The driving signal VG1 that pole drive circuit 109 produces makes main switch M1 disconnect.
Further, the first comparator 102 in primary-side-control circuit 101 obtains the discharge time signal of vice-side winding
TD, error amplifier 103 obtains error signal EAOUT of output voltage.Then, constant current loop back control module 105 is according to electric discharge
Time signal TD produces the first Continuity signal ONC, and constant voltage loop back control module 106 produces second according to error signal EAOUT and leads
Messenger ONV.When at least one in the first Continuity signal ONC and the second Continuity signal ONV is effective, logic control circuit
The level upset of the pulse-width signal PWM1 of 108 is high level, and the driving signal VG1 that gate driver circuit 109 produces makes
Main switch M1 turns on again.
In each switch periods of main switch M1, main switch M1 disconnects after turning on a period of time.At switch electricity
During the work in source 100, main switch M1 alternate conduction and disconnection in the multiple switch periods of continuous print, thus control output electricity
Stream and/or voltage reach stable predetermined value.When output voltage VO UT increases, the first Continuity signal ONC and the second Continuity signal
ONV can postpone, thus regulates the mean power of output, and vice versa.By controlling switch periods and the duty of main switch M1
Ratio so that output voltage VO UT of Switching Power Supply is stable in setting value.
Secondary control circuit 112 has input, for receiving port voltage VD, and outfan, it is used for providing synchronization
The driving signal VG2 of switching tube M2.Further, secondary control circuit 112 includes the 3rd comparator the 113, the 4th comparator
114, logic control circuit 115, gate driver circuit 117.
The in-phase input end receiving port voltage VD of the 3rd comparator 113, inverting input receives reference voltage VREF4.
3rd comparator 113 by port voltage VD compared with reference voltage VREF4, and outfan provide Continuity signal ON2.
The in-phase input end receiving port voltage VD of the 4th comparator 114, inverting input receives reference voltage VREF5.
This reference voltage VREF5 is more than above-mentioned reference voltage VREF4.4th comparator 114 is by port voltage VD and reference voltage
VREF5 compares, and provides cut-off signal OFF2 at outfan.
Logic control circuit 115 receives above-mentioned Continuity signal ON2 and cut-off signal OFF2, generates arteries and veins after processing
Wide modulated signal PWM2.Gate driver circuit 117 promotes driving force further to produce the driving signal of synchro switch pipe M2
VG2。
In each switch periods of synchro switch pipe M2, synchro switch pipe M2 disconnects after turning on a period of time.Synchronize
The switch periods of switching tube M2 is identical with the switch periods of main switch M1, thus synchronously completes once in each switch periods
Output rectification.
Specifically, during the conducting of main switch M1, port voltage VD is high level.When main switch M1 disconnects,
Port voltage VD is low level.When main switch M1 disconnects, port voltage VD is low level.At the beginning of main switch M1 disconnects
In stage beginning, synchro switch pipe M2 is also off, by the diode current flow of its parasitism.Secondary control circuit 112 detection port voltage
VD.When port voltage VD is less than the reference voltage VREF4 set, the Continuity signal ON2 upset of output so that synchro switch pipe
M2 turns on.When secondary current is gradually reduced, port voltage VD raises, when it is more than the reference voltage VREF5 set, and breaking of output
ON signal OFF2 upset is effective so that synchro switch pipe disconnects.
Figure 4 and 5 are shown respectively in Switching Power Supply according to embodiments of the present invention the primary controller and secondary control used
The schematic circuit of device processed, wherein, primary-side-control circuit 201 and secondary control circuit 212 are such as the switch shown in Fig. 1
In power supply.
Primary-side-control circuit 201 has two inputs, receives voltage feedback signal VFB and current sampling signal respectively
VS, and outfan, for providing the driving signal VG1 of main switch.Further, primary-side-control circuit 201 includes first
Comparator 204, error amplifier 205, load detecting module 202, line loss adjusting module 203, output line loss compensating module 206,
Constant current loop back control module 207, constant voltage loop back control module the 208, second comparator 209, logic control circuit 210 and grid drive
Galvanic electricity road 211.
The in-phase input end of the first comparator 204 receives voltage feedback signal VFB, and inverting input receives reference voltage
VREF1.First comparator 204 detects between the high period of voltage feedback signal VFB, thus obtains the discharge time of vice-side winding
Signal TD.The outfan of the first comparator 204 provides described discharge time signal TD.
The in-phase input end of error amplifier 205 receives voltage feedback signal VFB, and inverting input receives reference voltage
VREF2.This reference voltage VREF2 is regulated according to the size of output loading by exporting line loss compensating module 206.Error amplifier
The outfan of 205 provides error signal EAOUT.
Constant current loop back control module 207 obtains the first Continuity signal ONC according to discharge time signal TD, and constant voltage loop controls
Module obtains the second Continuity signal ONV according to error signal EAOUT.The in-phase input end of the second comparator 209 receives with reference to electricity
Pressure VREF3, inverting input receives current sampling signal VS, and provides cut-off signal OFF at outfan.
Logic control circuit 210 receives above-mentioned the first Continuity signal ONC, the second Continuity signal ONV and cut-off signal
OFF, generates pulse-width signal PWM1 after processing.Gate driver circuit 211 promotes driving force further to produce
The driving signal VG1 of main switch M1.
During the work of Switching Power Supply 200, primary-side-control circuit 201 controls main switch M1 when system electrification leads
Logical so that the primary current IP flowing through main switch M1 is gradually increased.Correspondingly, the voltage drop on current sampling resistor RS, i.e.
The level of current sampling signal VS increases.The second comparator 209 in primary-side-control circuit 201 is by current sampling signal VS
Compared with reference voltage VREF3.When current sampling signal reaches reference voltage VREF3, the outfan of the second comparator 209
Cut-off signal OFF effective so that the upset of the level of the pulse-width signal PWM1 of logic control circuit 210 is low level, grid
The driving signal VG1 that pole drive circuit 211 produces makes main switch M1 disconnect.
Further, the first comparator 204 in primary-side-control circuit 201 obtains the discharge time signal of vice-side winding
TD, error amplifier 205 obtains error signal EAOUT of output voltage.Then, constant current loop back control module 207 is according to electric discharge
Time signal TD produces the first Continuity signal ONC, and constant voltage loop back control module 208 produces second according to error signal EAOUT and leads
Messenger ONV.When at least one in the first Continuity signal ONC and the second Continuity signal ONV is effective, logic control circuit
The level upset of the pulse-width signal PWM1 of 210 is high level, and the driving signal VG1 that gate driver circuit 211 produces makes
Main switch M1 turns on again.
In each switch periods of main switch M1, main switch M1 disconnects after turning on a period of time.At switch electricity
During the work in source 200, main switch M1 alternate conduction and disconnection in the multiple switch periods of continuous print, thus control output electricity
Stream and/or voltage reach stable predetermined value.When output voltage VO UT increases, the first Continuity signal ONC and the second Continuity signal
ONV can postpone, thus regulates the mean power of output, and vice versa.By controlling switch periods and the duty of main switch M1
Ratio so that output voltage VO UT of Switching Power Supply is stable in setting value.
Different from the primary-side-control circuit of prior art, examine according to the load in the primary-side-control circuit 201 of this embodiment
Survey module 202 for detecting the switch periods of Switching Power Supply 100, it is thus achieved that characterize airborne signals LDET of Light Condition.Line loss is adjusted
Mould preparation block 203 produces new line loss compensation signal LREG according to airborne signals LDET.Output line loss compensating module 206 is according to defeated
Go out the size of load, the reference voltage VREF2 of alignment error amplifier 205.Therefore, at the holding state of Switching Power Supply 100, main
Switching tube M1 periodically conducting and disconnection, work in predetermined switching frequency.
Secondary control circuit 212 has input, for receiving port voltage VD, and outfan, it is used for providing synchronization
The driving signal VG2 of switching tube M2.Further, secondary control circuit 212 includes the 3rd comparator the 216, the 4th comparator
217, logic control circuit 218, gate driver circuit 220, load detecting module 219.
The in-phase input end receiving port voltage VD of the 3rd comparator 216, inverting input receives reference voltage VREF4.
3rd comparator 216 by port voltage VD compared with reference voltage VREF4, and outfan provide Continuity signal ON2.
The in-phase input end receiving port voltage VD of the 4th comparator 217, inverting input receives reference voltage VREF5.
This reference voltage VREF5 is more than above-mentioned reference voltage VREF4.4th comparator 217 is by port voltage VD and reference voltage
VREF5 compares, and provides cut-off signal OFF2 at outfan.
Logic control circuit 218 receives above-mentioned Continuity signal ON2 and cut-off signal OFF2, generates arteries and veins after processing
Wide modulated signal PWM2.Gate driver circuit 220 promotes driving force further to produce the driving signal of synchro switch pipe M2
VG2。
In each switch periods of synchro switch pipe M2, synchro switch pipe M2 disconnects after turning on a period of time.Synchronize
The switch periods of switching tube M2 is identical with the switch periods of main switch M1, thus synchronously completes once in each switch periods
Output rectification.
Specifically, during the conducting of main switch M1, port voltage VD is high level.When main switch M1 disconnects,
Port voltage VD is low level.When main switch M1 disconnects, port voltage VD is low level.At the beginning of main switch M1 disconnects
In stage beginning, synchro switch pipe M2 is also off, by the diode current flow of its parasitism.Secondary control circuit 212 detection port voltage
VD.When port voltage VD is less than the reference voltage VREF4 set, the Continuity signal ON2 upset of output so that synchro switch pipe
M2 turns on.When secondary current is gradually reduced, port voltage VD raises, when it is more than the reference voltage VREF5 set, and breaking of output
ON signal OFF2 upset is effective so that synchro switch pipe disconnects.
Different from the secondary control circuit of prior art, examine according to the load in the secondary control circuit 212 of this embodiment
Survey module 219 for detecting the switch periods of Switching Power Supply 100.When less than setting value, produce output control signal LEN, make
Must drive signal VG2 is low level.Therefore, at the holding state of Switching Power Supply 100, synchro switch pipe M2 remains off.
Fig. 6 illustrates the schematic circuit of the load detecting module used in Switching Power Supply according to embodiments of the present invention.
This load detecting module is such as in the secondary control circuit 212 shown in primary-side-control circuit 201 or Fig. 5 shown in Fig. 4.
In the following description, illustrate as a example by the load detecting module 219 in secondary control circuit 212.
Load detecting module 219 includes that first triggers with door AND1, second and door AND2, the first d type flip flop D1 to the 7th D
Device D7.
The input signal that load detecting module 219 receives includes that the first square-wave signal OSC, the overall situation enable signal EN, pulsewidth
Modulated signal PWM2, the second square-wave signal PWM2_DELAY, it is provided that output signal for output control signal LEN.Second square wave
After signal PWM2_DELAY is the rising edge time delay of pulse-width signal PWM2, but the square-wave signal that trailing edge is consistent.
During the work of load detecting module 219, when the second square-wave signal PWM2_DELAY is high level, a D
Trigger D1 to the 7th d type flip flop D7 resets, and output control signal LEN that load detecting module 219 produces also is low level.When
Second square-wave signal PWM2_DELAY is become low level from height, and after i.e. the synchro switch pipe M2 of current period disconnects, a D triggers
Device D1 to the 7th d type flip flop D7 starts working, and the first square-wave signal OSC of input is carried out frequency division counter.
When timing time long enough, the outfan of four d flip-flop D4, the outfan of the 5th d type flip flop D5, the 6th D touch
The signal of the outfan sending out device D6 is all high level.Second is output as high level with door AND2, the low electricity of second and door AND2
The turn-off time of synchro switch pipe M2 it is between at ordinary times.The input signal of the 7th trigger D7 is pulse-width signal PWM2, by
In the hysteresis of the second square-wave signal PWM2_DELAY rising edge, the rising edge of the i.e. second square-wave signal PWM2_DELAY compares pulsewidth
Modulated signal PWM2 slow a period of time arrives, so being changed into high level when the next cycle starts pulse-width signal PWM2, but
It is that counting d type flip flop above is not zeroed out action.Output control signal LEN had both been the second and door AND2 output, the most currently
The output power information in cycle was used by the next cycle.
When the turn-off time of synchro switch pipe M2 is more than setting value, first second overturn as high level with door AND2, then
The arrival of pulse-width signal PWM2 rising edge, also sets high output control signal LEN signal, in next switch periods, disconnected
Open synchro switch pipe M2.
Fig. 7 illustrates the working waveform figure of Switching Power Supply according to embodiments of the present invention.In conjunction with Fig. 1, Fig. 4 and Fig. 5, according to this
The principles illustrated of the primary-side-control circuit of synchronous rectification of inventive embodiments is as follows.
Figure 7 illustrates input voltage VI, output voltage VO UT, the driving signal VG1 of main switch M1, synchro switch pipe
The pulsewidth that the driving signal VG2 of M2, primary current IP, port voltage VD, secondary current IS, logic control circuit 218 produce is adjusted
The airborne signals that output control signal LEN of signal PWM2 processed, load detecting module 219 generation, load detecting module 202 produce
LDET。
After system starts normally to work, when main switch M1 just disconnects when, transformator T1 assists on winding
Output voltage VO UT is provided.Feedback signal VFB of output voltage VO UT is obtained by sampling resistor R1 and sampling resistor R2 dividing potential drop.
Primary-side-control circuit 201 detects feedback signal VFB high level time, it is thus achieved that TD discharge time of secondary windings, warp
Cross the conversion of constant current loop back control module 207, it is thus achieved that the first Continuity signal ONC.
Output line loss compensating module 206 is according to the judgement to output loading, it is thus achieved that the reference voltage in constant voltage loop
VREF2.Voltage feedback signal VFB compares amplification with reference voltage VREF2 through error amplifier 205, it is thus achieved that error signal
EAOUT, and obtain the second Continuity signal ONV by constant voltage loop back control module 208.
Logic control circuit 210 is according to the first Continuity signal ONC and the second Continuity signal ONV, it is thus achieved that big with output voltage
Little corresponding pulse-width signal PWM1.Obtain driving signal VG1 after gate driver circuit 211 strengthens driving force,
For controlling the main switch M1 grid of power tube output circuit 212 so that the drain terminal electric current of main switch M1 is gradually increased.
Along with the electric current of main switch M1 increases, the current sampling signal VS on sampling resistor Rs also increases.Work as electricity
When stream sampled signal VS arrives setting value VREF3, the cut-off signal OFF upset of the second comparator 209 so that logic control circuit
210 and gate driver circuit 211 disconnect main switch M1.
In order to promote system effectiveness, synchro switch pipe M2 is used to substitute Schottky diode in the application shown in Fig. 1.?
In synchronous rectification scheme, when main switch M1 turns on, the port voltage VD of secondary is high level.When main switch M1 disconnects
Time, port voltage VD is low level.Now, secondary current IS electric current reaches maximum, then starts to be gradually reduced, and synchro switch
Pipe M2 disconnects, and relies on its parasitic diode to turn on.
Secondary control circuit 212 uses the 3rd comparator 216 and the 4th comparator 217 detection port voltage VD.Work as port
When voltage VD is less than the reference voltage VREF4 set, the Continuity signal ON2 upset of the 3rd comparator 216 output, work as port voltage
When VD is less than the reference voltage VREF5 set, the cut-off signal OFF2 upset of the 4th comparator 217 output.This reference voltage
VREF5 is more than above-mentioned reference voltage VREF4.Logic control circuit 218 produces according to Continuity signal ON2 and cut-off signal OFF2
Pulse-width signal PWM2.Gate driver circuit 220 is driven the enhancing of ability to pulse-width signal PWM2, thus produces
Drive signal VG2, for controlling conducting and the disconnection of synchro switch pipe M2.Synchro switch pipe M2 is in the on-state to output electricity
Hold C1 charging and produce output voltage VO UT.
Load detecting module 219 produces output control signal LEN according to pulse-width signal PWM2.This output control signal
LEN further control gate drive circuit 220.If output control signal LEN is low level, signal VG2 is driven normally to export,
Synchro switch pipe M2 works under the control driving signal VG2.When synchro switch pipe M2 turns on, port voltage VD is negative pressure.
Along with the electric current of secondary current IS is gradually reduced, port voltage VD the most slowly raises.When port voltage VD is more than the reference set
During voltage VREF5, the cut-off signal OFF2 upset of the 4th comparator 217 output, synchro switch pipe M2 grid disconnects, completes once
Output rectification.If output control signal LEN is high level, then can control to drive signal VG2 is low level, synchro switch pipe M2
No longer controlled by synchronous detecting port voltage VD, continue the diode using its parasitism and charge to output capacitance C2.
In the multiple switch periods of continuous print, when output voltage VO UT increases, the first Continuity signal ONC and second conducting
Signal ONV will postpone, and then the mean power of regulation output, finally make output voltage VO UT stable in setting value, reach to set
Output.
In shown in Fig. 1, output voltage is obtained by following formula:
Wherein, the auxiliary winding turn ratio to secondary windings of N indication transformer T1, VDS is the source and drain of synchro switch pipe M2
Between pressure drop, R1 and R represents the resistance value of the divider resistance on feedback control loop.
Load detecting module 219 is according to the switch periods of Switching Power Supply, it is judged that load condition.Along with the load of system subtracts
Little, the second square-wave signal PWM2_DELAY low level time obtained by transformator port port voltage VD can be gradually increased,
The low level time of the second square-wave signal PWM2_DELAY can be with the output loading of equivalent system.When switch periods is more than setting value
Time, then judge that load, as Light Condition, can disconnect synchro switch pipe M2, to reduce power consumption.
Owing to synchro switch pipe M2 disconnects in zero load, i.e. the diode alternative synchronization switching tube M2 conducting of its parasitism, now
The source and drain pressure drop VDS of synchro switch pipe M2 increases.After being known switching by formula above, output voltage declines.For preventing this feelings
The generation of condition, increases load detecting module 202 and line loss adjusting module 203 on former limit.In the unloaded state, load detecting module
202 detect Light Condition, produce airborne signals LDET.Line loss adjusting module 203, according to airborne signals LDET, improves with reference to electricity
Pressure VREF2.Adjustment due to voltage so that output voltage meets design requirement in full power range.The load detecting on former limit
The principle of module 202 and the principle of the load detecting module 219 of secondary and circuit structure are essentially identical, are not described in detail in this.
It should be noted that, in this article, the relational terms of such as first and second or the like is used merely to a reality
Body or operation separate with another entity or operating space, and deposit between not necessarily requiring or imply these entities or operating
Relation or order in any this reality.And, term " includes ", " comprising " or its any other variant are intended to
Comprising of nonexcludability, so that include that the process of a series of key element, method, article or equipment not only include that those are wanted
Element, but also include other key elements being not expressly set out, or also include for this process, method, article or equipment
Intrinsic key element.In the case of there is no more restriction, statement " including ... " key element limited, it is not excluded that
Including process, method, article or the equipment of described key element there is also other identical element.
According to embodiments of the invention as described above, these embodiments do not have all of details of detailed descriptionthe, the most not
Limit the specific embodiment that this invention is only described.Obviously, as described above, can make many modifications and variations.This explanation
These embodiments are chosen and specifically described to book, is to preferably explain the principle of the present invention and actual application, so that affiliated
Technical field technical staff can utilize the present invention and amendment on the basis of the present invention to use well.The present invention is only by right
Claim and four corner thereof and the restriction of equivalent.
Claims (17)
1. a synchronous rectifying switching power source, including:
Transformator, including primary side winding and vice-side winding；
Main switch, is connected in series with described primary side winding, and periodically turns on and disconnect so that described primary side winding to
Described vice-side winding transmission energy；
Synchro switch pipe, is connected in series with described vice-side winding, and with described main switch according to identical cycle conducting and
Disconnect；
Output capacitance, the first end of described output capacitance is connected to described vice-side winding, and the second end is connected to described synchro switch
Pipe；
Primary-side-control circuit, for producing the first driving signal to control the conducting state of main switch；And
Secondary control circuit, for producing the two driving signal conducting state with control synchro switch pipe,
Wherein, the primary side winding of described transformator receives input voltage, and the vice-side winding of described transformator is to described output capacitance
Charging, thus in described output capacitance, produce output voltage,
When underloading or zero load, described secondary control circuit disconnects the primary current path of described synchro switch pipe, and dependence is posted
Raw diode maintains the conducting state of described synchro switch pipe.
Synchronous rectifying switching power source the most according to claim 1, wherein, when underloading or zero load, described primary-side-control electricity
Road regulation described first drives the switch periods of signal, to maintain described output voltage constant.
Synchronous rectifying switching power source the most according to claim 2, wherein, described primary-side-control circuit and described secondary control
Circuit includes load detecting module respectively, for according to described first drive in signal and described two driving signal at least it
One judges whether to be in light condition.
Synchronous rectifying switching power source the most according to claim 3, wherein, described load detecting module detection described first is driven
In dynamic signal and described two driving signal at least one switch periods, and judge load shape according to described switch periods
State,
If described switch periods is more than or equal to predetermined value, then judge to be in light condition,
If described switch periods is less than described predetermined value, then judge to be in normal load state.
Synchronous rectifying switching power source the most according to claim 4, wherein, described load detecting module is in the second pulsewidth modulation
Under the control of signal, the first square-wave signal is carried out frequency division counter, thus judges that whether described switch periods is more than predetermined value, institute
State secondary control circuit and produce described two driving signal according to described second pulse-width signal.
Synchronous rectifying switching power source the most according to claim 5, wherein, described load detecting module includes:
Multiple first triggers, are serially connected into branch frequency counting circuit, and the plurality of first trigger receives described first
Square-wave signal, and multiple first output signal is provided；
First and door, including enabling the first input end of signal for receiving the overall situation, for receiving the second of the second square-wave signal
Input, and the outfan of the second output signal is provided, described second output signal is used for enabling the plurality of first and triggers
Device；
Second and door, including the multiple inputs for receiving the plurality of first output signal, and provide the 3rd output letter
Number outfan；And
Second trigger, including for receiving the first input end of described 3rd output signal and for receiving described second pulsewidth
Second input of modulated signal, and the outfan of output control signal is provided,
Wherein, described second square-wave signal is the delay signal of described second pulse-width signal, and described output control signal is used
In the output controlling described two driving signal.
Synchronous rectifying switching power source the most according to claim 3, wherein, described primary-side-control circuit includes:
First comparator, for comparing the voltage feedback signal and the first reference voltage that characterize described output voltage, to produce
The discharge time signal of raw vice-side winding；
Second comparator, for comparing described voltage feedback signal and the second reference voltage, to produce error signal；
Constant current loop back control module, for producing the first Continuity signal according to described discharge time signal；
Constant voltage loop back control module, for producing the second Continuity signal according to described error signal；
3rd comparator, for flowing through current sampling signal and the 3rd reference voltage phase of the electric current of described main switch by sign
Relatively, to produce cut-off signal；
First logic control circuit, for according to described first Continuity signal, described second Continuity signal and described cut-off signal
Produce the first pulse-width signal；And
First grid drive circuit, drives signal for producing described first according to described first pulse-width signal；And
First load detecting module, for producing airborne signals according to described first pulse-width signal,
Wherein, described primary-side-control circuit regulates described second reference voltage according to airborne signals, thus regulates described first and drive
The switch periods of dynamic signal.
Synchronous rectifying switching power source the most according to claim 7, also includes:
Line loss adjusting module, for producing line loss compensation signal according to described airborne signals；And
Output line loss compensating module, for producing described second reference voltage according to described line loss compensation signal.
Synchronous rectifying switching power source the most according to claim 3, wherein, described secondary control circuit includes:
4th comparator, is used for by the terminal voltage of described vice-side winding compared with the 4th reference voltage, to produce the 3rd conducting
Signal；
5th comparator, is used for by described terminal voltage compared with the 5th reference voltage, to produce the second cut-off signal；
Second logic control circuit, adjusts for producing the second pulsewidth according to described 3rd Continuity signal and described second cut-off signal
Signal processed；
Second grid drive circuit, for producing described two driving signal according to described second pulse-width signal；And
Second load detecting module, for producing output control signal according to described second pulse-width signal,
Wherein, described first grid drive circuit provides described two driving signal under the control of described output control signal.
10. a control method for synchronous rectifying switching power source, including:
Use the first driving signal, periodically turn on and disconnect the main switch connected with primary side winding so that from transformator
Vice-side winding from primary side winding to transformator transmit energy；
Use two driving signal, periodically turn on and disconnect the synchro switch pipe connected with vice-side winding, to output capacitance
Charging, thus output voltage is provided in output capacitance；
Wherein, when underloading or zero load, disconnect the primary current path of described synchro switch pipe, and rely on described synchro switch pipe
Parasitic diode maintain described synchro switch pipe conducting state.
11. methods according to claim 10, wherein, when underloading or zero load, drive signal by regulation described first
Switch periods, maintain described output voltage constant.
12. methods according to claim 11, wherein, drive in signal and described two driving signal according to described first
At least one judge whether to be in light condition.
13. methods according to claim 12, wherein, it may be judged whether the step being in light condition includes:
Detect described first drive in signal and described two driving signal at least one switch periods；And
Load condition is judged according to described switch periods,
Wherein, if described switch periods is more than or equal to predetermined value, then judge to be in light condition,
If described switch periods is less than described predetermined value, then judge to be in normal load state.
14. methods according to claim 13, wherein, judge that according to described switch periods the step of load condition includes:
Under the control of the first pulse-width signal, the first square-wave signal is carried out frequency division counter, thus whether judges described switch periods
More than predetermined value.
15. methods according to claim 14, also include:
Airborne signals is produced according to detection；And
The switch periods of signal is driven according to airborne signals regulation described first.
16. methods according to claim 13, wherein, judge that according to described switch periods the step of load condition includes:
Under the control of the second pulse-width signal, the first square-wave signal is carried out frequency division counter, thus whether judges described switch periods
More than predetermined value.
17. methods according to claim 16, also include:
Output control signal is produced according to detection；
Described two driving signal is produced according to described second pulse-width signal；And
Described output control signal is used to control the output of described two driving signal.
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| CN113472207B (en) * | 2021-06-11 | 2022-12-20 | 杭州士兰微电子股份有限公司 | Switching power supply and control circuit thereof |
| CN113472207A (en) * | 2021-06-11 | 2021-10-01 | 杭州士兰微电子股份有限公司 | Switching power supply and control circuit thereof |
| CN114070082A (en) * | 2021-10-09 | 2022-02-18 | 深圳市创芯微微电子有限公司 | Control method and device of switching power supply and switching power supply chip |
| CN114070082B (en) * | 2021-10-09 | 2023-09-22 | 深圳市创芯微微电子股份有限公司 | Control method and device of switching power supply and switching power supply chip |
| CN114326478A (en) * | 2021-12-02 | 2022-04-12 | 东莞声索电子有限公司 | Constant voltage and constant current shared control loop |
| CN114326478B (en) * | 2021-12-02 | 2023-10-27 | 东莞声索电子有限公司 | Constant voltage constant current shared control loop |
| CN114362536A (en) * | 2021-12-03 | 2022-04-15 | 成都芯源系统有限公司 | Isolating switch converter, control circuit thereof and power supply method |
| CN114726068A (en) * | 2022-03-27 | 2022-07-08 | 广东新佳盟电子科技有限公司 | Charging management circuit |
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