CN206117515U - Synchronous Rectifier control circuit and flyback switching circuit - Google Patents
Synchronous Rectifier control circuit and flyback switching circuit Download PDFInfo
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- CN206117515U CN206117515U CN201621085275.0U CN201621085275U CN206117515U CN 206117515 U CN206117515 U CN 206117515U CN 201621085275 U CN201621085275 U CN 201621085275U CN 206117515 U CN206117515 U CN 206117515U
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- 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
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- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
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Abstract
The utility model provides a synchronous Rectifier control circuit and flyback switching circuit, drive circuit outlet driving signal switches on, turn -offs with control synchronous Rectifier pipe, threshold value comparison circuit drain -source voltage be less than control drive circuit output pull -up when presetting low threshold voltage drive signal so that the synchronous Rectifier piping lead to, the control drive circuit drop -down drive signal of output when drain -source voltage more than or equal to presets high threshold voltage so that the synchronous Rectifier pipe turn -off, pressure regulating control circuit moves the drive signal who presets the high value of pull -up voltage to on being lighter than the time control drive circuit output of presetting the pressure regulating reference value, being lighter than control drive circuit entering voltage regulation state when presetting high threshold voltage, carry out the pressure regulating with drive signal for drain -source voltage stabilization is near predetermineeing the pressure regulating reference value or predetermine the pressure regulating reference value. Accelerate the switch -off speed of synchronous Rectifier pipe greatly, prevented to lead directly to with former avris main switch pipe, improved the reliability of system.
Description
Technical field
This utility model is related to switch power technology, more particularly to be that a kind of synchronous commutating control circuit and inverse-excitation type are opened
Powered-down road.
Background technology
Fig. 1 is circuit of reversed excitation, is a kind of a kind of conventional isolated form on-off circuit, and the former limit side N01 of transformator TR1 connects
Primary circuit, input voltage vin 1 is input in primary voltage, and the diode D01 of secondary side N02 flows through output current Vout1,
Output current Vout1 is loaded in load, is loaded in parallel with electric capacity C01.Because the function of electrical equipment increases, its output power
Need to increase, i.e. Switching Power Supply needs to provide bigger output current for electrical equipment.
In order to improve the transformation efficiency of Switching Power Supply, diode is substituted using devices, referring to Fig. 2, by Fig. 1
In secondary side sustained diode 01 be replaced with synchronous rectifier M11, specifically, transformator TR2 former limits side N11 input
Vin2, former limit side connection main switch M10, the conducting shut-off of main switch M10 so that input current ip2 changes so that
Secondary side N12 generation output currents is2, the corresponding output voltage Vout2 of generation, synchronous rectifier M11 source electrodes connection vice-side winding,
Drain electrode connection load one end, load the other end ground connection, load it is also in parallel with electric capacity C11, synchronous rectifier M11 source-drain electrode it
Between be also connected with a sustained diode 11.In the on-off circuit of non-isolation type, the drive circuit of devices can be compared with
The switching signal of main switch is easily obtained, therefore the control of synchronous rectification is relatively easy.But, in the isolation of Fig. 2
In the on-off circuit of type, in the control for devices M11, it is difficult to obtain the switching signal of main switch M10, because
This, is susceptible to the phenomenon that synchronous rectifier M11 and main switch M10 are simultaneously turned on, or synchronous rectifier M11 only in portion
Divide freewheeling period conducting, cause system effectiveness not high.Therefore, the synchronous rectification control of current synchronous rectifier is one and chooses
War.
Utility model content
This utility model provides a kind of synchronous commutating control circuit and switch flyback switch circuit, greatly accelerates synchronous rectification
The turn-off speed of pipe, prevents straight-through with former limit side main switch, improves the reliability of system.
To solve the above problems, this utility model provides a kind of synchronous commutating control circuit, for control with synchronous whole
The on-off circuit of flow tube, the control circuit includes：
Drive circuit, its outfan connects the drive end of synchronous rectifier, and output drive signal is controlling synchronous rectifier
On, off；
Threshold value comparison circuit, its input receives the drain-source voltage of synchronous rectifier, and low less than default in drain-source voltage
The drive signal of the drive circuit output pull-up is controlled during threshold voltage, so that synchronous rectifier conducting；It is big in drain-source voltage
The drive circuit is controlled when equal to default high threshold voltage and export drop-down drive signal, so that synchronous rectifier shut-off；
Voltage regulator control circuit, gathers the drain-source voltage of synchronous rectifier, and compares with default pressure regulation reference value, in drain-source electricity
The drive signal that the drive circuit output is pulled upward to default upper pull-up voltage high level is controlled when pressure is less than default pressure regulation reference value,
The drive circuit is controlled when drain-source voltage is more than or equal to default pressure regulation reference value and less than default high threshold voltage enter voltage
Adjustment state, by drive signal pressure regulation is carried out, and exports the drive signal after the pressure regulation so that drain-source voltage is stable in default pressure regulation
Near reference value or default pressure regulation reference value.
According to one embodiment of the present utility model, the voltage regulator control circuit reaches one in synchronous rectifier ON time
In certain hour during definite value or before control synchronous rectifier shut-off, if the drive circuit is introduced into Voltage Cortrol shape
State, then export dynamic adjustment signal.
According to one embodiment of the present utility model, also including dynamic regulation of voltage circuit, connect the Regulation Control electricity
Road, receives and responds to the dynamic adjustment signal of the voltage regulator control circuit output, and adjusts the default pressure regulation reference value
Value, the default pressure regulation reference value after output adjustment gives the voltage regulator control circuit.
According to one embodiment of the present utility model, there is the voltage regulator control circuit the previous of recording synchronism rectifier tube to lead
The logging modle of logical time T1, when this secondary control synchronous rectifier ON time reaches N*T1, if the drive circuit does not enter
Enter voltage adjustment condition, then export dynamic adjustment signal, N values are percentage rate.
According to one embodiment of the present utility model, there is the voltage regulator control circuit detection drive circuit to adjust in voltage
The detection module of the time of whole state.
According to one embodiment of the present utility model, also including Dynamic voltage scaling circuit, connect the Regulation Control electricity
Road, the value of the default pressure regulation reference value of time adjustment in voltage adjustment condition obtained according to detection module so that be in
The time of voltage adjustment condition is equal or close to certain value.
According to one embodiment of the present utility model, the threshold value comparison circuit includes：
First comparator, its negative input end receives the drain-source voltage of voltage regulator control circuit output, its positive input terminal input institute
Default low threshold voltage is stated, its outfan exports the first comparison signal；
Second comparator, its positive input terminal receives the drain-source voltage of voltage regulator control circuit output, its negative input end input institute
Default high threshold voltage is stated, its outfan exports the second comparison signal；
Trigger, it receives first comparison signal and the second comparison signal, and defeated when the first comparison signal is high
Go out the first control signal, control the drive signal of drive circuit output pull-up, the second comparison signal for it is high when export the
Two control signals, the control drive circuit export drop-down drive signal.
This utility model also provides a kind of switch flyback switch circuit, including the synchronization in previous embodiment described in any one
The synchronous rectification control method of rectifier control circuit or use as described in any one in previous embodiment.
After above-mentioned technical proposal, this utility model has the advantages that compared to existing technology：
In the case where main switch switching signal is not needed, discontinuous current conduction mode had both been may operate in, it is also possible to
Current continuous-conduction mode is worked in, by the driving voltage of dynamic regulation synchronous rectifier, it is ensured that synchronous rectifier is from relatively low
Magnitude of voltage begins to turn off, and greatly accelerates turn-off speed, prevents from being led directly to the main switch of former limit side, improves the reliability of system
Property, accelerating turn-off speed can also reduce the reverse current of secondary current, can reduce MOS (metal oxide
Semiconductor, metal-oxide semiconductor (MOS)) switching tube due to voltage spikes, such that it is able to use lower pressure metal-oxide-semiconductor,
Reduce device cost.
Additionally, before synchronous rectifier shut-off certain hour, detection drive signal whether in voltage adjustment condition, or
So that the time of voltage adjustment condition maintains definite value, it is ensured that even at current continuous-conduction mode, and electric current it is larger when,
Synchronous rectifier can be constantly on, reduces conduction loss, improves system effectiveness.
Description of the drawings
Fig. 1 is the electrical block diagram of the on-off circuit of an embodiment of the prior art；
Fig. 2 is the electrical block diagram of the on-off circuit of another embodiment of prior art；
Fig. 3 is the electrical block diagram of the on-off circuit of this utility model embodiment；
Fig. 4 is the electrical block diagram of the synchronous commutating control circuit of this utility model embodiment；
Fig. 5 is that the voltage regulator control circuit of this utility model embodiment is illustrated with the circuit structure of dynamic regulation of voltage circuit
Figure；
Fig. 6 is the waveform diagram of the synchronous rectifier drive signal of this utility model embodiment.
Specific embodiment
It is understandable to enable above-mentioned purpose of the present utility model, feature and advantage to become apparent from, below in conjunction with the accompanying drawings to this
The specific embodiment of utility model is described in detail.
Elaborate many details in order to fully understand this utility model in the following description.But this practicality is new
Type can be implemented with being much different from alternate manner described here, and those skilled in the art can be new without prejudice to this practicality
Similar popularization is done in the case of type intension, therefore this utility model is not embodied as being limited by following public.
The synchronous commutating control circuit of this utility model embodiment, for on-off circuit of the control with synchronous rectifier.
Fig. 3 shows the on-off circuit of an embodiment, including：Former limit side winding N31 one end of transformator TR3, transformator TR3 receives defeated
Enter voltage Vin, input current ip is flowed through on winding N31；The drain electrode connection transformer TR3 of main switch M20, main switch M20
Former limit side winding N31 the other end, the source ground of main switch M20, the grid of main switch M20 receives and main drives letter
Number；Secondary side winding N32 one end output output voltage Vout of transformator TR3, and one end of the end connection load；Load,
The other end ground connection of load；The source electrode of synchronous rectifier M21, synchronous rectifier M21 and the other end common ground connection for loading, it is synchronous
The other end of the secondary side winding N32 of the drain electrode connection transformer TR3 of rectifier tube M21, the grid of synchronous rectifier M21 is used as drive
Moved end receives the drive signal DRV of synchronous commutating control circuit U1 outputs.But the form of on-off circuit is not restricted to this, its
There is synchronous rectifier to realize that the circuit of synchronous rectification is suitable for for he, such as the on-off circuit in Fig. 2 is also suitable.
In the present embodiment, the source electrode of synchronous rectifier M21 and load common ground connection, to connect in synchronous commutating control circuit
With the source electrode output common ground of synchronous rectifier M21 during ground, synchronous rectifier M21 can be conveniently controlled.
Synchronous rectifier M21 and main switch M20 in the present embodiment is preferably MOS transistor, more particularly NMOS
Transistor, but can also be other kinds of switching tube, and such as audion, IGCT, multiple aforementioned pipes connect opening of being formed
Guan Guan etc..
With continued reference to Fig. 3, fly-wheel diode, the positive pole connection of fly-wheel diode can be parallel with synchronous rectifier M21
The source electrode of synchronous rectifier, the negative pole of fly-wheel diode connects the drain electrode of synchronous rectifier M21.The fly-wheel diode can be same
The parasitic diode, or additional diode of step rectifier tube M21, is not specifically limited.After main switch M20 shut-offs,
Should turn on fly-wheel diode afterflow synchronous rectifier M21 in parallel.
Referring to Fig. 3 and 4, synchronous commutating control circuit U1 includes：Drive circuit U15, threshold value comparison circuit U10 and pressure regulation control
Circuit U processed 14.
Voltage regulator control circuit U14 gathers the drain-source voltage V of synchronous rectifier M21SW, the drain-source voltage V of collectionSWContinue to employ simultaneously
During threshold value comparison circuit U10 can be input to, drain-source voltage VSWVoltage between as synchronous rectifier M21 drain electrode d and source electrode s.
After main switch M20 shut-offs, fly-wheel diode afterflow conducting.
The input of threshold value comparison circuit U10 can receive the drain-source voltage of synchronous rectifier M21 by voltage regulator controllers
VSW.In drain-source voltage VSWDuring less than default low threshold voltage V1, drive circuit U15 is by the magnitude of voltage of drive signal DRV for control
Draw, export pull-up drive signal DRV so that synchronous rectifier M21 conducting, the default low threshold voltage V1 be, for example ,-
300mV, but only as example, concrete numerical value without limitation, can be preset as needed, the default low threshold voltage V1
Can be that the pulling drive function of causing drive circuit U15 is enabled.
Voltage regulator control circuit U14 is by drain-source voltage VSWCompare with default pressure regulation reference value V2.In drain-source voltage VSWLess than pre-
If during pressure regulation reference value V2, control drive circuit pulls up drive signal DRV, and is pulled upward to default upper pull-up voltage high level, defeated
The drive signal DRV gone out after continuing to pull up, due to being pull-up, thus synchronous rectifier M21 is still turned on, the default upper pull-up voltage
The ceiling voltage that high level preferably can pull, such as 12V, but only as example.In drain-source voltage VSWMore than or equal to default pressure regulation
Reference value V2 and during less than default high threshold voltage V3, control drive circuit U15 enters voltage adjustment condition, by drive signal
DRV carries out pressure regulation, exports the drive signal DRV after the pressure regulation so that drain-source voltage VSWIt is stable in default pressure regulation reference value V2 or
Near default pressure regulation reference value V2, so as to drive signal DRV is controlling its gate turn-off of convergence before synchronous rectifier M21 is turned off
Threshold voltage.Drive signal DRV voltages convergence gate turn-off threshold voltage before shut-off, can rapidly switch off synchronous rectifier
M21。
Default pressure regulation reference value V2 can be preset, and value can cause drive signal DRV to close in grid before shut-off
Disconnected threshold voltage can be nearby, for example -60mV, but only as an example.
Default low threshold voltage V1, default pressure regulation reference value V2, default high threshold voltage V3 are negative voltage, preset low threshold
Threshold voltage V1<Default pressure regulation reference value V2<Default high threshold voltage V3.
Threshold value comparison circuit U10 is in drain-source voltage VSWDuring more than or equal to default high threshold voltage V3, drive circuit U15 is controlled
Drive signal is drop-down, zero is preferably pulled down to, drop-down drive signal is exported, so that synchronous rectifier M21 shut-offs.Due to pressure regulation
The Regulation Control of control circuit U14, by drive signal DRV voltages near gate turn-off threshold voltage, thus can be fast
Speed shut-off synchronous rectifier M21.Default high threshold voltage V3 is, for example, -10mV, but only as example, concrete numerical value is not as limit
System, can be preset as needed.
Two inputs of drive circuit U15 connect respectively the outfan and voltage regulator control circuit of threshold value comparison circuit U10
The outfan of U14, and controlled by threshold value comparison circuit U10 and voltage regulator control circuit U14, the outfan connection of drive circuit U15
The drive end (the namely grid of synchronous rectifier) of synchronous rectifier M21, output drive signal DRV is controlling synchronous rectifier
The on, off of M21.
Switching Power Supply with synchronous rectifier M21 both may operate in discontinuous current conduction mode, it is also possible to work in electricity
Stream continuous conduction mode, by the drive signal DRV voltages of dynamic regulation synchronous rectifier M21, it is ensured that synchronous rectifier M21 from
Lower voltage value begins to turn off, and greatly accelerates turn-off speed, prevents from being led directly to the main switch M20 of former limit side, improves and is
The reliability of system, accelerating turn-off speed can also reduce secondary current isReverse current, the voltage of MOS switch pipe can be reduced
Spike, such that it is able to use lower pressure metal-oxide-semiconductor, reduces device cost.
In one embodiment, voltage regulator control circuit U14 when synchronous rectifier M21 ON times reach certain value or
In certain time interval T 2 before the M21 shut-offs of control synchronous rectifier, if drive circuit U15 is introduced into voltage adjustment condition,
Output dynamic adjustment signal, can carry out timing by timing circuit to synchronous rectifier M21 ON times, or be preset in
In certain time interval T 2 before shut-off, judge whether drive circuit U15 enters voltage adjustment condition, the judgement of the state can basis
The comparative result of voltage regulator control circuit U14 outputs determines.With continued reference to Fig. 4, synchronous commutating control circuit U1 also includes dynamic tune
Whole potential circuit U16, connects voltage regulator control circuit U14, receives and responds to the dynamic adjustment letter of voltage regulator control circuit U14 outputs
Number, and the value of default pressure regulation reference value V2 is adjusted, default pressure regulation reference value V2 after output adjustment is to voltage regulator control circuit
U14.It is preferred that reducing default pressure regulation reference value V2 to certain value, exit drive signal DRV voltages and be pulled upward to default upper pull-up voltage
The state of high level, into drive signal DRV voltage adjustment conditions so that drive signal DRV voltages were in grid before shut-off
Near shut-off threshold voltage, synchronous rectifier M21 can be rapidly switched off.
Voltage regulator control circuit U14 can be realized using the combination of the custom circuits such as voltage comparator circuit, timing circuit.Voltage
Comparison circuit compares drain-source voltage VSWWith default pressure regulation reference value V2, comparative result be used for control drive circuit U15 output electricity
Pressure (drive signal DRV).Timing circuit carries out timing to drive circuit U15 in the time of voltage adjustment condition, and controls dynamic
State adjusts potential circuit U16, makes the output voltage of dynamic regulation of voltage circuit U 16, that is, presetting pressure regulation reference value V2 is carried out accordingly
Regulation.Drive circuit U15 employings can realize the drive circuit of pressure regulation output function, specifically repeat no more.
Preferably, voltage regulator control circuit U14 has the record mould of the previous ON time T1 of recording synchronism rectifier tube M21
Block, when this secondary control synchronous rectifier M21 ON times reach N*T1, if drive circuit U15 is introduced into voltage adjustment condition,
Then export dynamic adjustment signal, N values be percentage rate, such as but not limited to N=70%.
In yet another embodiment, voltage regulator control circuit U14 has detection drive circuit U15 in voltage adjustment condition
The detection module of time Ta, as long as simultaneously timing is capable of achieving the comparative result of detection voltage regulator control circuit U14, obtains drain-source voltage
VSWEqual or close to the time Ta of default pressure regulation reference value V2 of the output of dynamic regulation of voltage circuit U 16.Synchronous rectification control electricity
Road U1 also includes Dynamic voltage scaling circuit (may refer to Fig. 4), connects voltage regulator control circuit U14, is obtained according to detection module
Default pressure regulation reference value V2 of time adjustment in voltage adjustment condition value so that in the time of voltage adjustment condition
Equal or close to certain value T3.Dynamic voltage scaling circuit presets the value of pressure regulation reference value V2 by adjusting so that time Ta
Equal or close to certain value T3.It is, when time Ta is less than certain value T3, then reducing default pressure regulation reference value V2
Value；When time Ta is more than certain value T3, then the value of default pressure regulation reference value V2 is raised.Certain value T3 can be pre- as needed
If.
Whether the certain hour before synchronous rectifier M21 shut-offs, detection drive signal DRV is in voltage adjustment condition, or
Person causes the time of voltage adjustment condition to maintain definite value, it is ensured that even at current continuous-conduction mode, and electric current is larger
When, synchronous rectifier M21 can be constantly on, reduces conduction loss, improves system effectiveness.
By taking the circuit structure of Fig. 4 as an example, specifically, threshold value comparison circuit U10 can include：First comparator U11, second
Comparator U12 and trigger U13.The negative input end of first comparator U11 receives drain-source voltage VSW, first comparator U11 is just
The default low threshold voltage V1 of input input, the outfan of first comparator U11 exports the first comparison signal.Second comparator
The positive input terminal of U12 receives the drain-source voltage V of voltage regulator control circuit U14 outputsSW, the negative input end input of the second comparator U12
The outfan of default high threshold voltage V3, the second comparator U12 exports the second comparison signal.3rd trigger U13 receives first
Comparison signal and the second comparison signal, and the first control signal, control drive circuit U15 are exported when the first comparison signal is high
The drive signal of output pull-up, under the second control signal, the U15 outputs of control drive circuit are exported when the second comparison signal is high
The drive signal of drawing.
Optionally, trigger U13 is rest-set flip-flop.After main switch M20 shut-offs, and in parallel continuous of synchronous rectifier M21
Stream diode continuousing flow conducting, as drain-source voltage VSWLess than default low threshold voltage V1, then the output of first comparator U11 is by low change
Set end S of height, i.e. rest-set flip-flop is height, and clear terminal R is low, and the outfan Q of rest-set flip-flop is height, the outfan of rest-set flip-flop
An input of drive circuit U15 is connected to, the drive signal DRV that drive circuit U15 produces pull-up is controlled.Work as synchronous rectification
Pipe M21 electric currents further reduce, drain-source voltage VSWVoltage is increased to default high threshold voltage V3, then the second comparator U12's is defeated
Go out and uprised by low, the clear terminal R of rest-set flip-flop by it is low uprise, set end S is low, outfan Q for low, that is, control drive circuit
The drive signal DRV step-downs of U15 outputs, by synchronous rectifier M21 shut-offs.
The operation principle of synchronous commutating control circuit is detailed below：After main switch M20 shut-offs, and synchronous rectifier
Fly-wheel diode afterflow conducting M21 in parallel, as drain-source voltage VSWLess than default low threshold voltage V1, then first comparator U11
Output is uprised by low, i.e., set end S of rest-set flip-flop is height, and clear terminal R is low, and the outfan Q of rest-set flip-flop is height, and RS is triggered
The outfan of device is connected to an input of drive circuit U15, controls the drive signal DRV that drive circuit U15 produces pull-up.
The output voltage of dynamic regulation of voltage circuit U 16 is default pressure regulation reference value V2, is initially preset value (such as -60mV), and is input into
To in voltage regulator control circuit U14, drain-source voltage VSWAlso it is the input of voltage regulator control circuit U14.Voltage regulator control circuit U14 is relatively moved
Default pressure regulation reference value V2 and drain-source voltage V of the output of state adjustment potential circuit U16SW, as drain-source voltage VSWLess than default tune
Pressure reference value V2 (such as -60mV), then voltage regulator control circuit U14 controls drive circuit U15, makes drive signal DRV be pulled upward to it most
High voltage (such as 12V)；As drain-source voltage VSWVoltage is more than or equal to default pressure regulation reference value V2, then voltage regulator control circuit U14 controls
Drive circuit U15, makes drive circuit U15 adjust drive signal DRV, makes drain-source voltage VSWVoltage stabilization is in default pressure regulation reference value
Near V2, i.e., drive signal DRV voltages are in voltage adjustment condition；Voltage regulator control circuit U14 is recorded before previous switch record
The time T1 of synchronous rectifier conducting, and T2 (such as the 1us) time point before synchronous rectifier M21 shut-offs, or it is synchronous
When the ON time of rectifier tube M21 reaches N*T1 (such as N=70%), if voltage regulator control circuit U14 does not control drive circuit
U15 is in drive signal DRV voltage adjustment conditions, then voltage regulator control circuit U14 control dynamic regulation of voltage circuit U 16 so as to
Default pressure regulation reference value V2 of output is reduced to certain value, so that voltage regulator control circuit U14 control drive circuit U15 so as to
Into drive signal DRV voltage adjustment conditions.When synchronous rectifier M21 electric currents further reduce, drain-source voltage VSWVoltage is raised
To default high threshold voltage V3, then the output of the second comparator U12 is uprised by low, and the clear terminal R of rest-set flip-flop is uprised, put by low
Position end S is that low, outfan Q is low, i.e., the drive signal DRV step-downs that control drive circuit U15 is exported, by synchronous rectifier M21
Shut-off.
Referring to Fig. 5, in one embodiment, voltage regulator control circuit U14 includes：Operational amplifier U30；Operational amplifier
The first input end of U30 receives drain-source voltage VSW, second input of operational amplifier U30 is received presets pressure regulation reference value V2,
In the outfan output amplifier output level OUT1 to drive circuit U15 of operational amplifier U30, drive signal DRV is adjusted
Section.In drain-source voltage VSWDuring less than default pressure regulation reference value V2, amplifier output level OUT1 is pulled to peak, to adjust drive
U15 outputs in galvanic electricity road are pulled upward to the drive signal of default upper pull-up voltage high level；In drain-source voltage VSWMore than default pressure regulation reference value
During V2, amplifier output level OUT1 is pulled down, so that drive signal DRV is drop-down, so as to drain-source voltage VSWReduce, such closed loop is anti-
Present to adjust drain-source voltage VSWStablize near default pressure regulation reference value V2 or default pressure regulation reference value V2.
Further, voltage regulator control circuit U14 also includes：4th comparator U20；First input of the 4th comparator U20
End receives the amplifier output level OUT1 of the outfan output of the operational amplifier U30, second input of the 4th comparator U20
End receives less than the comparative level V4 of the peak certain value that (comparative level V4 can be slightly less than amplifier output level OUT1 quilts
The peak of pull-up, and higher than amplifier output level OUT1 during voltage adjustment condition), the outfan of the 4th comparator U20 is defeated
Go out second and compare output level；When amplifier output level OUT1 is peak, second compares output level for low, defeated in amplifier
When going out level OUT1 and being pulled down adjustment, second compares output level for height；First trigger U22, the reception of the first trigger U22
The output control signal of threshold value comparison circuit U10 negates second comparing for signal NGATE and the 4th comparator U20 outputs
Output level, negates the not circuit of output control signal GATE that signal NGATE can pass through to receive threshold value comparison circuit U10
U21 outputs are obtained；Charge-discharge circuit, the output control signal of the threshold value comparison circuit U10 negate signal NGATE for low and
Second compare output level for it is high when, the first trigger U22 output signal control charge-discharge circuit be charged；The threshold value
The output control signal of comparison circuit U10 negate signal NGATE for it is high when, control charge-discharge circuit discharged；And the
The first input end of five comparator U23, the 5th comparator U23 receives the charging/discharging voltage VC1 of the charge-discharge circuit, the 5th ratio
The second input compared with device U23 receives pressure regulation time predetermined level V5, and the outfan output the 3rd of the 5th comparator U23 compares defeated
Go out level V6；Charging/discharging voltage VC1 is in Voltage Cortrol shape from the time that original state reaches pressure regulation time predetermined level V5
The time of state, wherein, when charging/discharging voltage VC1 is more than pressure regulation time predetermined level V5, the 3rd compares output level V6 controls moves
State voltage-regulating circuit U16 raises default pressure regulation reference value；Charging/discharging voltage VC1 is less than pressure regulation time predetermined level, the 3rd ratio
Default pressure regulation reference value is lowered compared with output level V6 control Dynamic voltage scalings circuit U 16.
Preferably, Dynamic voltage scaling circuit U 16 includes：The reset termination of the second trigger U24, the second trigger U24
The output control signal for receiving threshold value comparison circuit U10 negates signal NGATE, and the set end of the second trigger U24 receives described
The 3rd of 5th comparator U23 outputs compares output level V6；First pulse generating circuit U26, the first pulse generating circuit U26
Input connect the outfan of the second trigger U24, when the outfan of the second trigger U24 is output as high, output
First trigger pulse；With door U25, the second trigger U24 is connected with the first input end of door U25 negates outfan, with
Second input of door U25 receives the output control signal of threshold value comparison circuit U10 and negates signal NGATE；Second pulse is sent out
Raw circuit U 27, the input connection outfan with door U25 of the second pulse generating circuit U27, in the output with door U25
Hold for it is high when, export the second trigger pulse；And first switch K22, the first current source I21, second switch K23, the second electric current
Source I22, first share electric capacity C21, the first current source I21 and the second current source I22 series connection, and concatenate point connection described the
One end of electric capacity C21 is used altogether and as the outfan of default pressure regulation reference value V2, first shares the another of electric capacity C21
End ground connection；First switch K22 is turned on by the first trigger pulse control of the first pulse generating circuit U26, so that the
The electric current of one current source I21 flows through described first and shares electric capacity C21 to raise default pressure regulation reference value V2；Described second opens
Close K23 to be turned on by second trigger pulse control, so that the electric current of the second current source I22 flows through described second shares electric capacity
C21 is lowering default pressure regulation reference value V2.
Optionally, the charge-discharge circuit in voltage regulator control circuit U14 includes：3rd switch K21, the 3rd current source I20, the
Four switch K20 and second share electric capacity C20, the 3rd switch K21, the 3rd current source I20 series connection, and share electric capacity with second
The first end connection of C20, junction point output charging/discharging voltage VC1, second shares the second end ground connection of electric capacity C20, and described the
It is in parallel that four switch K20 share electric capacity C20 with described second；The 3rd switch K21 is believed by the output of the first trigger RS
Number control, with conducting when cause the 3rd current source I20 electric current flow through described second share electric capacity C20 be charged；It is described
4th switch K20 is controlled by the signal NGATE that negates of the output control signal of threshold value comparison circuit U10, described in conducting
Second shares electric capacity C20 electric discharges.
When the output control signal GATE voltage of threshold value comparison circuit U10 is 0, i.e., when synchronous rectifier is turned off, threshold value
Signal NGATE (the GATE voltages are negated) controls the 4th that negate of the output control signal of comparison circuit U10 switch K20 conductings, the
The two charging/discharging voltage VC1 shared on electric capacity C20 are reset to 0.When the output control signal GATE electricity of threshold value comparison circuit U10
Press for it is high when, i.e., synchronous rectifier turn on when, the 4th switch K20 disconnect.
Referring to Fig. 5, more particularly, in one embodiment, the first trigger, the second trigger are rest-set flip-flop.
Comparative level V4 is the low certain value of peak than amplifier output level OUT1.Amplifier output level OUT1 and comparative level V4 enter
Row compares, and when amplifier output level OUT1 is peak, then operational amplifier U20 is output as low, and rest-set flip-flop U22's is defeated
Go out to hold Q to be 0, the 3rd switch K21 disconnects, and charging/discharging voltage VC1 is still 0.When drive signal DRV voltages are in adjustment state,
That is amplifier output level OUT1 is not ceiling voltage, then the 4th comparator U20 is output as height, the outfan Q of rest-set flip-flop U22
For height, the 3rd switchs K21 conductings, and the 3rd current source I20 shares electric capacity C20 and is charged to second, and charging/discharging voltage VC1 is linear
Rise.Charging/discharging voltage VC1 rises to the time of pressure regulation time predetermined level V5 and is drive signal DRV in Voltage Cortrol shape
The preset value T3 of state.When charging/discharging voltage VC1 exceedes pressure regulation time predetermined level V5, then it represents that drive signal DRV is in voltage
The time Ta of adjustment state is output as height more than preset value T3, i.e. the 5th comparator U23；When charging/discharging voltage VC1 is in threshold value
When output control signal GATE of comparison circuit U10 is 0, never more than pressure regulation time predetermined level V5, then it represents that drive
Time Tas of the signal DRV in voltage adjustment condition is less than default T3, the i.e. output of the 5th comparator U23 during GATE is for height
It is always low.Rest-set flip-flop U24 is reset when output control signal GATE of threshold value comparison circuit U10 is low, i.e. Q is 0,
For height.Rest-set flip-flop U24 is set when output control signal GATE of threshold value comparison circuit U10 is high, rest-set flip-flop U24's
Output Q is height,For low.The outfan Q of rest-set flip-flop U24 is connected to the first pulse generating circuit U26, as rest-set flip-flop U24
When being output as high, there is the first pulse of one fixed width in the first pulse generating circuit U26, and first pulse causes first switch
K22 is turned on so that default pressure regulation reference value V2 is raised, you can to shorten times of the drive signal DRV in voltage adjustment condition
Ta.When comparator U23 output during output control signal GATE of threshold value comparison circuit U10 is for height always for low, then when
When output control signal GATE of threshold value comparison circuit U10 is low, the outfan of rest-set flip-flop U24For height, i.e., with door U25's
Outfan is height.The second pulse generating circuit U27 is connected to the outfan of door U25, when being output as high with door U25, the
There is the second pulse of one fixed width in two pulse generating circuit U27, second pulse causes second switch K23 to turn on so that pre-
If pressure regulation reference value V2 is reduced, you can to lengthen the time Ta for driving DRV in voltage adjustment condition.By the dynamic adjustment electricity
The value of default pressure regulation reference value V2 of volt circuit U16 adjustment so that drive time Tas of the DRV in voltage adjustment condition to be equal to default
Value T3.
With in circuit of reversed excitation, the waveform that on-off circuit when secondary side diode replaces with synchronous rectifier is produced is illustrating
Bright, on-off circuit can be the circuit structure illustrated in Fig. 3.Secondary current iS, drain-source voltage VSWVoltage, synchronous rectifier drive
Signal DRV waveforms are as shown in Figure 6.In figure 6, with V1=-300mV, V21=-60mV as a example by V3=-10mV, works as main switch
When M20 is turned off, fly-wheel diode carries out afterflow, and drive signal DRV is low, and synchronous rectifier M21 is turned off, secondary current iSElectric current
Rise, then drain-source voltage VSWVoltage decline, electric current flows through parasitic diode or additional diode.At the t01 moment, work as leakage
Source voltage VSWDrop to -300mV, then the output of rest-set flip-flop is uprised by low, because drive circuit U15 has certain time delay, greatly
About tens nanoseconds, therefore, the t02 moment has been arrived, the output of drive circuit U15 just begins to ramp up.In t03 moment, drive signal
DRV voltages reach its on state threshold voltage, synchronous rectifier M21 conductings, drain-source voltage VSWRaise.In t03-t04, drain-source electricity
Pressure VSWLess than -60mV, thus drive signal DRV voltages be in its ceiling voltage, at the t04 moment, preset pressure regulation reference value V2 from -
60mV is reduced to -80mV, makes drive signal DRV voltages in voltage adjustment condition, and drive signal DRV voltages decline.In t04-
Between the t05 moment, former limit main switch M20 conductings, therefore secondary current iSIt is rapid to decline, secondary current iSOccur in that turning point,
Drain-source voltage VSWAlso raise rapidly, at the t05 moment, as drain-source voltage VSWWhen being increased to -10mV, drive signal DRV voltages start
Be pulled low, due to drive signal DRV voltages before the t05 moment already at adjustment state, from gate turn-off threshold voltage very
Closely, therefore drive signal DRV voltages one are pulled low, synchronous rectifier M21 is just turned off, and has arrived the t06 moment, and drive signal DRV is electric
Pressure is pulled down to 0, can rapidly switch off synchronous rectifier M21, prevents from being simultaneously turned on main switch M20.
This utility model also provides a kind of synchronous rectification control method, for the control electricity of the switch with synchronous rectifier
Road, the control method is comprised the following steps：
The drain-source voltage of collection synchronous rectifier；
Drain-source voltage compares with default low threshold voltage, and when drain-source voltage is less than default low threshold voltage, control drives
Circuit output pull-up drive signal, so that synchronous rectifier conducting；
Drain-source voltage compares with default pressure regulation reference value, in drain-source voltage more than or equal to default low threshold voltage and less than pre-
If the drive signal that the drive circuit output resume is pulled upward to default upper pull-up voltage high level is controlled during pressure regulation reference value, in drain-source
The drive circuit is controlled when voltage is more than or equal to default pressure regulation reference value and less than default high threshold voltage enter Voltage Cortrol
State, by drive signal pressure regulation is carried out, and exports the drive signal after the pressure regulation so that drain-source voltage is stable in default pressure regulation reference
Near value or default pressure regulation reference value；
Drain-source voltage compares with default high threshold voltage, when drain-source voltage is more than or equal to default high threshold voltage, control
The drive circuit exports drop-down drive signal, so that synchronous rectifier shut-off.
Default pressure regulation reference value V2 can be preset, and value can cause drive signal DRV to close in grid before shut-off
Disconnected threshold voltage can be nearby, for example -60mV, but only as an example.
In one embodiment, synchronous rectification control method can also include：One is reached in synchronous rectifier ON time
In certain hour during definite value or before control synchronous rectifier shut-off, if drive circuit is introduced into voltage adjustment condition,
Reduce the value of the default pressure regulation reference value.
Preferably, the previous ON time T1 of recording synchronism rectifier tube, reaches in this secondary control synchronous rectifier ON time
During to N*T1, if the drive circuit is introduced into voltage adjustment condition, the value of the default pressure regulation reference value is reduced, N takes
It is worth for percentage rate.
In yet another embodiment, synchronous rectification control method can also include：Detection drive circuit is in Voltage Cortrol
The time of state, the value of the default pressure regulation reference value of adjustment so that the time in voltage adjustment condition is certain value.
Aforementioned synchronization rectifier control circuit is may refer to regard to the particular content of this utility model synchronous rectification control method
In specific embodiment description, will not be described here.
This utility model also provides a kind of switch flyback switch circuit, including the synchronization in previous embodiment described in any one
The synchronous rectification control method of rectifier control circuit or use as described in any one in previous embodiment, referring specifically to aforementioned
Corresponding description in embodiment.
Although this utility model is disclosed as above with preferred embodiment, it is not for limiting claim, Ren Heben
Art personnel can make possible variation and modification in without departing from spirit and scope of the present utility model, therefore
The scope that protection domain of the present utility model should be defined by this utility model claim is defined.
Claims (8)
1. a kind of synchronous commutating control circuit, for on-off circuit of the control with synchronous rectifier, it is characterised in that the control
Circuit includes：
Drive circuit, its outfan connects the drive end of synchronous rectifier, and output drive signal is controlling leading for synchronous rectifier
Logical, shut-off；
Threshold value comparison circuit, its input receives the drain-source voltage of synchronous rectifier, and in drain-source voltage less than default Low threshold
The drive signal of the drive circuit output pull-up is controlled during voltage, so that synchronous rectifier conducting；Be more than in drain-source voltage etc.
The drive circuit is controlled when default high threshold voltage and export drop-down drive signal, so that synchronous rectifier shut-off；
Voltage regulator control circuit, gathers the drain-source voltage of synchronous rectifier, and compares with default pressure regulation reference value, little in drain-source voltage
The drive signal that the drive circuit output is pulled upward to default upper pull-up voltage high level is controlled when default pressure regulation reference value, in drain-source
The drive circuit is controlled when voltage is more than or equal to default pressure regulation reference value and less than default high threshold voltage enter Voltage Cortrol
State, by drive signal pressure regulation is carried out, and exports the drive signal after the pressure regulation so that drain-source voltage is stable in default pressure regulation reference
Near value or default pressure regulation reference value.
2. synchronous commutating control circuit as claimed in claim 1, it is characterised in that the voltage regulator control circuit is in synchronous rectification
In certain hour when pipe ON time reaches certain value or before control synchronous rectifier is turned off, if the drive circuit
Voltage adjustment condition is introduced into, then exports dynamic adjustment signal.
3. synchronous commutating control circuit as claimed in claim 2, it is characterised in that also including dynamic regulation of voltage circuit, even
The voltage regulator control circuit is connect, the dynamic adjustment signal of the voltage regulator control circuit output is received and responded to, and adjusts described
The value of default pressure regulation reference value, the default pressure regulation reference value after output adjustment gives the voltage regulator control circuit.
4. synchronous commutating control circuit as claimed in claim 2, it is characterised in that the voltage regulator control circuit has record same
The logging modle of the previous ON time T1 of step rectifier tube, when this secondary control synchronous rectifier ON time reaches N*T1, if
The drive circuit is introduced into voltage adjustment condition, then export dynamic adjustment signal, and N values are percentage rate.
5. synchronous commutating control circuit as claimed in claim 1, it is characterised in that there is the voltage regulator control circuit detection to drive
Detection module of the galvanic electricity road in the time of voltage adjustment condition.
6. synchronous commutating control circuit as claimed in claim 5, it is characterised in that also including Dynamic voltage scaling circuit, even
The voltage regulator control circuit is connect, according to the default pressure regulation reference value of time adjustment in voltage adjustment condition that detection module is obtained
Value so that the time in voltage adjustment condition be equal or close to certain value.
7. synchronous commutating control circuit as claimed in claim 1, it is characterised in that the threshold value comparison circuit includes：
First comparator, its negative input end receives the drain-source voltage of voltage regulator control circuit output, and its positive input terminal input is described pre-
If low threshold voltage, its outfan exports the first comparison signal；
Second comparator, its positive input terminal receives the drain-source voltage of voltage regulator control circuit output, and its negative input end input is described pre-
If high threshold voltage, its outfan exports the second comparison signal；
Trigger, it receives described first comparison signal and the second comparison signal, and the first comparison signal for it is high when export the
One control signal, the drive signal for controlling the drive circuit output pull-up, the output second when the second comparison signal is high is controlled
Signal processed, the control drive circuit export drop-down drive signal.
8. a kind of switch flyback switch circuit, it is characterised in that include the synchronous rectification as described in any one in claim 1-7
Control circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621085275.0U CN206117515U (en) | 2016-09-28 | 2016-09-28 | Synchronous Rectifier control circuit and flyback switching circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621085275.0U CN206117515U (en) | 2016-09-28 | 2016-09-28 | Synchronous Rectifier control circuit and flyback switching circuit |
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| CN206117515U true CN206117515U (en) | 2017-04-19 |
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| CN106208720A (en) * | 2016-09-28 | 2016-12-07 | 杰华特微电子（杭州）有限公司 | Synchronous commutating control circuit, method and switch flyback switch circuit |
| CN108494277A (en) * | 2018-05-07 | 2018-09-04 | 电子科技大学 | A kind of synchronous commutating control circuit improving electric efficiency |
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| CN108712159A (en) * | 2018-05-03 | 2018-10-26 | 福建科立讯通信有限公司 | A kind of the igniting start-up circuit and method of Vehicle mounted station |
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| CN109713921A (en) * | 2018-12-21 | 2019-05-03 | 西安矽力杰半导体技术有限公司 | A kind of synchronous commutating control circuit, control method and switching circuit |
| CN113572349A (en) * | 2020-04-28 | 2021-10-29 | 艾科微电子(深圳)有限公司 | Synchronous rectification controller and related control method |
| US11532992B2 (en) | 2020-04-28 | 2022-12-20 | Ark Semiconductor Corp. Ltd. | Synchronous rectifier controller and control method thereof |
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Address after: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030 Patentee after: Jiehuate Microelectronics Co.,Ltd. Address before: Room 424, building 1, 1500 Wenyi West Road, Cangqian street, Yuhang District, Hangzhou City, Zhejiang Province Patentee before: JOULWATT TECHNOLOGY (HANGZHOU) Co.,Ltd. |