CN104836444B - The control method and circuit of a kind of self adaptation blanking time - Google Patents
The control method and circuit of a kind of self adaptation blanking time Download PDFInfo
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- CN104836444B CN104836444B CN201510200986.1A CN201510200986A CN104836444B CN 104836444 B CN104836444 B CN 104836444B CN 201510200986 A CN201510200986 A CN 201510200986A CN 104836444 B CN104836444 B CN 104836444B
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Abstract
This application provides the control method of self adaptation blanking time a kind of and control circuit.It is in the control method, the feedback voltage signal for the secondary voltage signal for characterizing isolated converter is obtained in the primary side of isolated converter, and the primary side blanking time of self adaptation is produced according to the change of feedback voltage signal itself, again feedback voltage signal is detected to obtain secondary voltage information or need the information of secondary control signal being passed after then in the primary side blanking time terminating.Therefore, sample the control circuit of this self adaptation blanking time, the primary side blanking time is with detected object Self-variation, both response speed of the system to signal effectively can be improved using the primary side blanking time as short as possible, again will not because the primary side blanking time is too short and detection that false triggering is to secondary voltage signal, so as to improve the stability of control system.
Description
Technical field
The present invention relates to field of switch power, a kind of control method more specifically to self adaptation blanking time and
Circuit.
Background technology
The Switching Power Supply of control is because the device of system is few, simple in construction, low cost and other advantages, in field of power supplies such as LED
It is used widely in driving power supply, charger and adapter etc..Fig. 1 for circuit frame figure is controlled in one in the prior art,
The feedback signal for characterizing output voltage is obtained by being coupled positioned at the assists winding of primary side with the vice-side winding of transformer, then
The feedback signal is detected using controller, so as to realize the detection to output voltage, and the switch of main switch is controlled
State, makes the value of output voltage be maintained desired magnitude of voltage.
In control circuit as shown in Figure 1, in order to avoid the influence that Transformer Winding resonance is detected to controller, typically
Need to add blanking time circuit in the controller, so that within the blanking time, controller does not detect feedback signal.It is existing
Blanking time produced by the blanking time circuit of some controllers is a fixed value, is made in each switch periods,
Start detection feedback signal again by a fixed blanking time after main switch conducting.Although this blanking time circuit
It is simple in construction, but because the blanking time of generation is fixed, in order to meet the demand under different situations, the blanking time can only be set
It is long, with avoid because the blanking time is too short and detection of the false triggering to wake-up voltage signal, and cause the unstable of system.
However, the blanking time sets long, and it is inevitable to delay the response time of controller again, so as to limit dynamic performance
Lifting.Therefore, the existing this stability with the control circuit for fixing the blanking time mutually conflicts with response characteristic.
The content of the invention
In view of this, the present invention provides the control method and circuit of a kind of self adaptation blanking time, to solve prior art
Response characteristic and the afoul problem of stability.
A kind of control method of self adaptation blanking time, for controlling isolated converter, the isolated converter bag
Include the transformer being made up of primary side winding and vice-side winding, the main switch being connected with primary side winding, be connected with vice-side winding
Continued flow tube, it is characterised in that including：
The anti-of the secondary voltage signal on the vice-side winding is characterized in the primary side side acquisition one of the isolated converter
Feedthrough voltage signal；
According to the switch controlling signal of the main switch, feedback voltage signal and first predetermined value voltage signal, produce
Primary side blanking time signal so that the primary side blanking time signal switches to effective status when the main switch is turned on,
Disarmed state is switched to when the feedback voltage signal was less than after first predetermined value voltage signal by first scheduled time；
It is described anti-by detecting after the primary side blanking time signal switches to disarmed state in each switch periods
Whether feedthrough voltage signal is more than the first predetermined value voltage signal to obtain the information of the secondary voltage signal.
It is preferred that, when needing a secondary control signal of the secondary side of the isolated converter being transferred to the original
When avris is to detect, the control method also includes controlling secondary control signal described in the secondary voltage characterization, so that
The feedback voltage signal characterizes the secondary control signal.
It is preferred that, during the primary side blanking time signal is in effective status, the secondary control signal is not entered
Control of the row to the secondary voltage signal.
It is preferred that, when the secondary control signal characterizes the information of output electric signal of the isolated converter, institute
Stating control method also includes controlling the value of the output electric signal to be maintained desired value according to first detection signal.
A kind of control circuit of self adaptation blanking time, for controlling isolated converter, the isolated converter bag
Include the transformer being made up of primary side winding and vice-side winding, the main switch being connected with primary side winding, be connected with vice-side winding
Continued flow tube, it is characterised in that including：
Primary side feedback circuit, the secondary electricity characterized on the vice-side winding is obtained in the primary side side of the isolated converter
Press the feedback voltage signal of signal；
Primary side blanking time circuit, for the switch controlling signal according to the main switch, feedback voltage signal and
One predetermined value voltage signal, produces primary side blanking time signal so that the primary side blanking time signal is in the main switch
Effective status is switched to during conducting, is made a reservation for until the feedback voltage signal is less than after first predetermined value voltage signal by first
Disarmed state is switched to during the time；
First detection circuit, receives the primary side blanking time signal, feedback voltage signal and first predetermined value voltage letter
Number, detect whether the feedback voltage signal is more than described the after disarmed state to be switched in the primary side blanking time signal
One predetermined value voltage signal, and produce first detection signal.
It is preferred that, described control circuit also includes secondary controller, produces a secondary control signal, and control described
Secondary control signal described in secondary voltage characterization.
It is preferred that, secondary blanking time circuit is provided with the secondary controller, for believing according to the secondary voltage
Number and a sign signal for characterizing the main switch on off state produce secondary blanking time signal,
The secondary blanking time signal switches to effective shape when main switch described in the sign signal designation is turned on
State, invalid shape is switched to when the secondary voltage signal was less than after second predetermined value voltage signal by second scheduled time
State,
During the secondary blanking time signal is effective status, the secondary controller makes the secondary control signal
Without the control to the secondary voltage signal,
Wherein, second scheduled time be not less than first scheduled time, and the secondary voltage signal with it is described
The ratio of feedback voltage signal is equal to the ratio of the second predetermined value voltage signal and the first predetermined value voltage signal.
It is preferred that, the primary side blanking time circuit includes the second detection circuit, the first logic circuit, the first timing electricity
Road, the second logic circuit,
The second detection circuit is used to detect whether the feedback voltage signal is less than first predetermined value voltage letter
Number, and signal is detected to the input output second of first logic circuit,
Another input of first logic circuit receives the switch controlling signal, output end and first timing
The input of circuit is connected, and the output end of first timing circuit is connected with an input of second logic circuit,
Second input of the second detection circuit receives the switch controlling signal, and output end exports the primary side and disappeared
Hidden time signal.
It is preferred that, the secondary blanking time circuit includes three testing circuit, the 3rd logic circuit, the second timing electricity
Road, the 4th logic circuit,
The three testing circuit is used to detect whether the secondary voltage signal is less than second predetermined value voltage letter
Number, and signal is detected to the input output the 3rd of the 3rd logic circuit,
Another input of 3rd logic circuit terminates the sign signal, output end and second timing circuit
Input is connected, and the output end of second timing circuit is connected with an input of the 4th logic circuit,
Second input of the 4th logic circuit, which is received, characterizes signal, and output end exports the secondary blanking time
Signal.
It is preferred that, it is characterised in that when the continued flow tube is diode, the secondary controller also includes and described two
The on-off circuit that pole pipe is connected in parallel, the secondary control signal by control the on-off circuit conducting and off-state come
Control the secondary voltage signal.
It is preferred that, when the secondary control signal characterizes the information of output electric signal of the isolated converter, institute
The drive control circuit that control circuit also includes controlling the main switch turn-on and turn-off according to first detection signal is stated, to control
The value of the system output electric signal is maintained desired value.
Therefore, in the control circuit, voltage on the vice-side winding for characterizing isolated converter is obtained in primary side
The feedback voltage signal of signal, and the primary side blanking time of the change generation self adaptation according to feedback voltage signal itself, then
Again feedback voltage signal is detected to obtain the information of voltage or needs on vice-side winding after in the primary side blanking time terminating
The information for the secondary control signal being passed.Therefore, the control circuit of sampling this self adaptation blanking time, primary side blanking time
With detected object Self-variation, both sound of the system to signal effectively can be improved using the primary side blanking time as short as possible
Answer speed, again will not because the primary side blanking time is too short and detection that false triggering is to secondary voltage signal, so as to improve control
The stability of system.
Brief description of the drawings
Fig. 1 is a kind of control circuit of the prior art；
Fig. 2 is a kind of circuit diagram of control embodiment of circuit one with the self adaptation blanking time according to the present invention；
Fig. 3 is a kind of optional implementation circuit diagram of primary side blanking time circuit；
Fig. 4 is a kind of optional implementation circuit diagram of secondary blanking time circuit；
One working waveform figure of the control circuit for the self adaptation blanking time that Fig. 5 provides for the application；
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
With reference to Fig. 2, it show according to a kind of control embodiment of circuit one with the self adaptation blanking time of the invention
Circuit diagram；The control circuit is applied in isolated converter.In the present embodiment, the isolated converter is with inverse-excitation type
Exemplified by converter, but not limited to this, the inverse excitation type converter reception input voltage signal VIN, to provide the defeated of stabilization for load
Go out voltage Vo.Specifically, the inverse excitation type converter include be made up of primary side winding Np and vice-side winding Ns transformer, with
The main switch S of primary side winding connection1And the continued flow tube being connected with vice-side winding, in the present embodiment, the continued flow tube is with two
Pole pipe D1Exemplified by, the diode cathode connects the vice-side winding, and anode is connected to reference ground.
With reference to shown in Fig. 2, in the present embodiment, the control circuit includes：When primary side feedback circuit 01, primary side blanking
Between circuit 02 and first detection circuit 03.
Primary side feedback circuit 01 is used for the primary side side in the isolated converter and obtains the secondary characterized on vice-side winding
Voltage signal VTSECFeedback voltage signal VZCS, in the present embodiment, primary side feedback circuit 01 can include one with secondary around
The primary side assists winding N of group couplingA, and by resistance R1、R2The first resistor potential-divider network of composition, then primary side assists winding is electric
The voltage that pressure is obtained after first resistor network partial pressure can be used as the feedback voltage signal V for characterizing secondary voltageZCS.Certainly,
In other embodiments, primary side auxiliary winding voltage VTUXCan be directly as the feedback voltage signal.
Primary side blanking time circuit 02 is according to the switch controlling signal V of main switchGS, feedback voltage signal VZCSAnd the
One predetermined value voltage signal produces a primary side blanking time signal PBLK, and the signal is in switch controlling signal VGSIndicate main switch
Pipe switches to effective status when turning on, and until feedback voltage signal VZCSTime less than first predetermined value voltage signal continues
Disarmed state is switched to during first scheduled time.Here first scheduled time is a regular time, it is necessary to according to change
The resonant condition of depressor is set, and in the case where eliminating transformer resonance is on the detection influence of feedback voltage signal, first is pre-
Must try one's best small can be set by fixing time, and for example it can be two durations in transformer resonance cycle.
First detection circuit 03 receives the primary side blanking time signal PBLK, feedback voltage signal VZCSIt is predetermined with first
Threshold voltage signal VDET(can be described first parameter for detecting circuit inner setting), to believe in the primary side blanking time
Number switch to after disarmed state and to detect whether the feedback voltage signal is more than the first predetermined value voltage signal, to produce first
Detect signal VP1, the secondary voltage signal just can be obtained in the primary side side by the detection to the feedback voltage signal
Information.First detection signal VP1 can be further transferred to isolated converter control circuit in other control modules,
As the control signal of other modules, for example, drive control circuit can be passed in the present embodiment, make drive control circuit
The switch motion of main switch is controlled according to first detection signal.For example in the present embodiment, the original of the isolated converter
While in addition to including primary side blanking time circuit and the first detection circuit, also including drive control circuit 04, first inspection
Survey signal to be passed in drive control circuit, it produces the switch controlling signal V of main switch according to first detection signalGS。
Here first predetermined value voltage signal VDETIt is with the first predetermined value voltage signal in primary side blanking time circuit
Same signal is two signals of size identical, be more than first predetermined value electricity in detection feedback voltage signal so as to can ensure that
Before pressure signal, influence of the eliminating transformer resonance to detection.First predetermined value voltage signal VDETCan have for one predetermined
The signal of amplitude and predetermined pulse width, the first inspection is produced whether detection feedback voltage signal is more than first predetermined value voltage signal
Survey signal when, detect feedback signal amplitude be more than the first predetermined value voltage signal amplitude, and pulsewidth also greater than
During the pulsewidth of first predetermined value signal, effective first detection signal just can be produced.
Specifically, a kind of achievable circuit structure of the primary side blanking time circuit in Fig. 2 is as shown in Figure 3.
With reference to Fig. 3, primary side blanking time circuit includes the second detection circuit 021, the first logic circuit 022, the first timing
Circuit 023, the second logic circuit 024.
Second detection circuit 021 detects the feedback voltage signal VZCSWhether the first predetermined value voltage signal is less than,
And detect signal V to the input output second of first logic circuit 022P2, the first logic circuit 022 it is another defeated
Enter end and receive the switch controlling signal VGS, output end is connected with the input of first timing circuit 023, first meter
When circuit output end be connected with an input of second logic circuit 024, second logic circuit second input
End receives the switch controlling signal VGS, output end exports the primary side blanking time signal PBLK, wherein first timing
The timing time set in circuit is the first predetermined value time.
For example in the present embodiment, the second detection circuit may include a comparator CP1, its in-phase input end receives described
Feedback voltage signal VZCS, the inverting input reception first predetermined value voltage signal VDET(can for one have predetermined value and
The signal of predetermined pulse width), output end output second detects signal VP2.First logic circuit can include the first nor gate NR1, its
Two inputs receive the second detection signal V respectivelyP2, switch controlling signal VGS, output end output with the first timing circuit 023
Input be connected.Second logic circuit 024 may include a first rest-set flip-flop RS1, it is electric that its set end receives the first timing
The first timing signal C of the scheduled time of sign first of the output on road 0231, reset terminal reception switch controlling signal VGS, output end
Export primary side blanking time signal PBLK.The operation principle of the circuit is subsequently doing labor with reference to working waveform figure.
When the secondary of isolated converter need transmit a secondary control signal to isolated converter primary side when, such as
In the control circuit shown in Fig. 2, the control circuit disclosed in the present embodiment can also include secondary controller 05, secondary control letter
The secondary control signal V for producing number itTControl the secondary voltage signal VTSECCharacterize secondary control signal VT, so as to make
Feedback voltage signal VZCSAlso the secondary control signal V can be characterizedT, that is, realize the purpose of the primary side of secondary side signal transmission.It is secondary
Side control signal can be for the signal for the dynamic responding speed for accelerating isolated converter, or quick-charge signal
Or the signal of other information for characterizing isolated converter output electric signal, in the present embodiment, will be with secondary control signal
Exemplified by secondary control signal for accelerating the dynamic responding speed of isolated converter.Secondary controller 05 may include secondary
Detect circuit 051 and produce the secondary control signal VTSignal generating circuit 052.In addition, in the present embodiment, continued flow tube
For diode D1, and it connects bottom, i.e. diode D1Be connected between reference ground and secondary assists winding.Then in continued flow tube
During for diode, secondary controller 05 also includes and diode D1On-off circuit in parallel, it can be to be connected to diode two ends
Switch S2.Secondary control signal VTPass through controlling switch S2Turn-on and turn-off control secondary voltage VTSEC, its principle and mistake
Cheng Wei：When secondary detection circuit 051 detects output voltage V in secondary controlleroDuring less than first threshold voltage, represent now
Isolated converter is in dynamic load process, and signal generating circuit 052 just produces one, and effectively (such as high level signal is to have
The signal of effect) secondary control signal VT(having certain pulsewidth), makes switch S2Conducting.Switch S2During conducting, secondary voltage can be made
VTSECIt is changed into high level, thus which characterizes secondary control signal VT, namely characterize the change information of output voltage.Due to pair
Polygonal voltage VTSECIn the case where vice-side winding is coupled with primary side assists winding, it is passed in primary side assists winding so that former
Feedback voltage signal V in the assists winding of sideZCSAlso secondary control signal can be reacted, so as to by detecting feedback voltage in primary side
Signal just can realize the detection to secondary control signal, so as to obtain the secondary control signal by first detection signal
Information.Certainly when secondary control signal is provided in other ways, the voltage system on its control vice-side winding also can be such as
Aforesaid way, or other manner, the present invention are not limited.Because the generation of primary side blanking time signal is believed with feedback voltage
Number VZCSThe size of itself is relevant, therefore in order to prevent the secondary control signal V of the generation of secondary controller 05TFeedback voltage is believed
Number VZCSInfluence, with avoid influence the primary side blanking time (the effective status duration of primary side blanking signal), in secondary control
Also need to set a secondary blanking time circuit 053 in device processed.
Secondary blanking time circuit 053, for according to secondary voltage VTSECThe main switch switch shape is characterized with one
The sign signal V of stateBZSecondary blanking time signal SBLK is produced, is that the secondary blanking time signal refers in the sign signal
Effective status is switched to when showing the main switch conducting, until the secondary voltage is less than second predetermined value voltage signal VSDET
Disarmed state is switched to when afterwards by second scheduled time.Secondary blanking time signal SBLK can make secondary controller in the pair
During side blanking time signal is effective status, control of the secondary control signal to the secondary voltage signal is shielded, with
Avoid influence of the secondary control signal to primary side blanking time signal.Wherein, second scheduled time is not less than described first
The scheduled time, and the ratio of the secondary voltage signal and the feedback voltage signal is equal to the second predetermined value voltage signal
With the ratio of the first predetermined value voltage signal.
One kind of secondary blanking time circuit 053 in Fig. 2 optionally realizes circuit as shown in figure 4, it may include the 3rd
Detect circuit 0531, the 3rd logic circuit 0532, the second timing circuit 0533, the 4th logic circuit 0534.
Three testing circuit 0531 is used to detect the secondary voltage VTSECWhether second predetermined value voltage letter is less than
Number VSDET, and detect signal V to the input output the 3rd of the 3rd logic circuitP3.3rd logic circuit it is another
Input receives the sign signal VBZ, output end is connected with the input of second timing circuit 0533, second meter
When circuit output end be connected with an input of the 4th logic circuit 0534, the 4th logic circuit second input
End receives the sign signal VBZ, the output end output secondary blanking time signal SBLK.
Specifically, three testing circuit includes comparator CP2, reception secondary voltage signal (this implementation of its in-phase input end
Secondary voltage signal is output voltage V in exampleoWith diode D1The voltage V of cathode terminalDDifference, i.e. Vo-VD), reverse input end connects
Receive second predetermined value voltage signal VSDET, the detection signal of output the 3rd VP3.Second logic circuit includes the second nor gate NR2, its
Two inputs receive the 3rd detection signal V respectivelyP3With the sign signal VBZ, output end is defeated with the first timing circuit 0223
Enter end to be connected.Wherein, secondary blanking time circuit 053 can also further comprise characterizing signal VBZGeneration circuit 0535, the electricity
Road can realize with a comparator, the in-phase end receiving voltage V of the comparatorD, end of oppisite phase one blanking threshold voltage of reception
VD_ON, output end output sign signal VBZ.When detecting voltage VDMore than blanking threshold voltage VD_ONWhen, represent now main switch
Pipe is begun to turn on, then characterizes signal and control the secondary blanking time signal SBLK of the 4th logic circuit output to switch to effective shape
State, until the secondary voltage is less than second predetermined value voltage signal VSDETInvalid shape is switched to when afterwards by second scheduled time
State.
The principle of the self adaptation blanking time of the control circuit realiration provided the application is provided below in conjunction with Fig. 5 and Fig. 2
And specific control process elaborates.
Fig. 5 controls the working waveform figure of circuit for the self adaptation blanking time that the application is provided.In t1Moment, main switch
S1Begin to turn on, the primary side blanking time, signal PBLK switched to effective status, while in secondary controller, the secondary blanking time
Circuit is by detecting diode D1The voltage V of cathode terminalDWith a blanking threshold voltage VD_ONMagnitude relationship judge main switch
S1Begin to turn on, then secondary blanking time signal SBLK also switches to effective status.Main switch S1Turn on and closed after a period of time
It is disconnected, secondary voltage VTESCAnd feedback voltage signal VZCSStart to do periodic harmonic moving.In t2Moment, primary side is detected
Feedback voltage signal VZCSLess than first predetermined value voltage signal VDET, while at the moment, secondary also detects that secondary voltage
VTESCLess than second predetermined value voltage signal VSDET, then the first timing circuit 023 start timing, timing reached for first scheduled time
X1When, the first timing signal C1Control the first rest-set flip-flop RS1The primary side blanking time signal PBLK of output switches to invalid shape
State, primary side blanking time T1For primary side blanking time signal PBLK effective status duration.In t2Moment, the second meter
When circuit also begin to timing, timing reaches the second scheduled time X2When, the second timing signal C2Control the second rest-set flip-flop RS2It is defeated
The primary side blanking time signal SBLK gone out switches to disarmed state, secondary blanking time T2For primary side blanking time signal SBLK's
Effective status duration.As can be seen here, in this application, primary side blanking time and secondary blanking time are with main electricity
The setting of road inherent parameters, can adaptation control circuit different situations demand.For example, when circuit power is different, transformer
When different, switching tube parameter is different, the blanking time can self adaptation these parameters change.
It should be noted that in the present embodiment, mainly with sustained diode1Connect in case of bottom to be specifically described
The present invention, but the same adaptation of invention and sustained diode1Connect the situation of position, i.e. sustained diode1Be connected to vice-side winding and
Situation between the anode of output capacitance.
Therefore, in the control circuit, voltage on the vice-side winding for characterizing isolated converter is obtained in primary side
The feedback voltage signal of signal, and the primary side blanking time of the change generation self adaptation according to feedback voltage signal itself, then
Again feedback voltage signal is detected to obtain the information of voltage or needs on vice-side winding after in the primary side blanking time terminating
The information for the secondary control signal being passed.Therefore, the control circuit of sampling this self adaptation blanking time, primary side blanking time
With detected object Self-variation, both sound of the system to signal effectively can be improved using the primary side blanking time as short as possible
Answer speed, again will not because the primary side blanking time is too short and detection that false triggering is to secondary voltage signal, so as to improve control
The stability of system.
The embodiment of the present application also discloses a kind of control method of self adaptation blanking time, for controlling isolated conversion
Device, the isolated converter is opened including the transformer being made up of primary side winding and vice-side winding, the master being connected with primary side winding
Guan Guan, the continued flow tube being connected with vice-side winding.The control method includes：
The anti-of the secondary voltage signal on the vice-side winding is characterized in the primary side side acquisition one of the isolated converter
Feedthrough voltage signal；
According to the switch controlling signal of the main switch, feedback voltage signal and first predetermined value voltage signal, produce
Primary side blanking time signal so that the primary side blanking time signal switches to effective status when the main switch is turned on,
Disarmed state is switched to when the feedback voltage signal was less than after first predetermined value voltage signal by first scheduled time；
It is described anti-by detecting after the primary side blanking time signal switches to disarmed state in each switch periods
Whether feedthrough voltage signal is more than the first predetermined value voltage signal to obtain the information of the secondary voltage signal.
In addition, when a secondary control signal of the secondary side of the isolated converter is transferred to the primary side by needs
When side is to detect, the control method also includes controlling secondary control signal described in the secondary voltage characterization, so that institute
State feedback voltage signal and characterize the secondary control signal.
Further, during the primary side blanking time signal is in effective status, the secondary control signal is made not
Carry out the control to the secondary voltage signal.
In addition, when the secondary control signal characterizes the information of output electric signal of the isolated converter, it is described
Control method also includes controlling the value of the output electric signal to be maintained desired value according to first detection signal.
The control circuit of dynamic response, control method are loaded to the improvement according to the preferred embodiments of the present invention above and opened
Powered-down source has carried out detailed description, and those of ordinary skill in the art can deduce other technologies or structure and circuit cloth accordingly
Office, element etc. can be applied to the embodiment.
According to embodiments of the invention as described above, these embodiments do not have all details of detailed descriptionthe, not yet
It is only described specific embodiment to limit the invention.As described above, it can make many modifications and variations.This specification is chosen
And these embodiments are specifically described, it is in order to preferably explain the principle and practical application of the present invention, so that affiliated technology is led
Field technique personnel can be used using modification of the invention and on the basis of the present invention well.The present invention is only by claims
And its limitation of four corner and equivalent.
Claims (11)
1. a kind of control method of self adaptation blanking time, for controlling isolated converter, the isolated converter includes
The transformer that is made up of primary side winding and vice-side winding, the main switch being connected with primary side winding, be connected with vice-side winding it is continuous
Flow tube, it is characterised in that including：
The feedback electricity of the secondary voltage signal on a sign vice-side winding is obtained in the primary side side of the isolated converter
Press signal；
According to the switch controlling signal of the main switch, feedback voltage signal and first predetermined value voltage signal, primary side is produced
Blanking time signal so that the primary side blanking time signal switches to effective status when the main switch is turned on, until
The feedback voltage signal switches to disarmed state when being less than after first predetermined value voltage signal by first scheduled time；
In each switch periods, by detecting the feedback electricity after the primary side blanking time signal switches to disarmed state
Whether pressure signal is more than the first predetermined value voltage signal to produce first detection signal, to obtain the secondary voltage signal
Information.
2. control method according to claim 1, it is characterised in that when needing the secondary side of the isolated converter
Secondary control signal when being transferred to the primary side side to detect, the control method also includes controlling the secondary voltage
Secondary control signal described in characterization, so that the feedback voltage signal characterizes the secondary control signal.
3. control method according to claim 2, it is characterised in that be in effective shape in the primary side blanking time signal
During state, make the secondary control signal without the control to the secondary voltage signal.
4. control method according to claim 3, it is characterised in that when secondary control signal sign is described isolated
During the information of the output electric signal of converter, the control method also includes controlling the output telecommunications according to first detection signal
Number value be maintained desired value.
5. a kind of control circuit of self adaptation blanking time, for controlling isolated converter, the isolated converter includes
The transformer that is made up of primary side winding and vice-side winding, the main switch being connected with primary side winding, be connected with vice-side winding it is continuous
Flow tube, it is characterised in that including：
Primary side feedback circuit, the secondary voltage letter characterized on the vice-side winding is obtained in the primary side side of the isolated converter
Number feedback voltage signal；
Primary side blanking time circuit, it is pre- for the switch controlling signal according to the main switch, feedback voltage signal and first
Fixed value voltage signal, produces primary side blanking time signal so that the primary side blanking time signal is turned in the main switch
When switch to effective status, until the feedback voltage signal be less than first predetermined value voltage signal after by first scheduled time
When switch to disarmed state；
First detection circuit, receives the primary side blanking time signal, feedback voltage signal and first predetermined value voltage signal, with
Detect whether the feedback voltage signal is more than described first after the primary side blanking time signal switches to disarmed state pre-
Fixed value voltage signal, and produce first detection signal.
6. control circuit according to claim 5, it is characterised in that also including secondary controller, produces a secondary control
Signal processed, and control secondary control signal described in the secondary voltage characterization.
7. control circuit according to claim 6, it is characterised in that when secondary blanking is provided with the secondary controller
Between circuit, for characterized according to the secondary voltage signal and one the sign signal of the main switch on off state produce it is secondary
Side blanking time signal,
The secondary blanking time signal switches to effective status when main switch described in the sign signal designation is turned on, directly
Disarmed state is switched to when being less than to the secondary voltage signal after second predetermined value voltage signal by second scheduled time,
During the secondary blanking time signal is effective status, the secondary controller makes the secondary control signal not enter
Control of the row to the secondary voltage signal,
Wherein, second scheduled time is not less than first scheduled time, and the secondary voltage signal and the feedback
The ratio of voltage signal is equal to the ratio of the second predetermined value voltage signal and the first predetermined value voltage signal.
8. control circuit according to claim 5, it is characterised in that the primary side blanking time circuit includes the second detection
Circuit, the first logic circuit, the first timing circuit, the second logic circuit,
The second detection circuit is used to detect whether the feedback voltage signal is less than the first predetermined value voltage signal, and
Signal is detected to the input output second of first logic circuit,
Another input of first logic circuit receives the switch controlling signal, output end and first timing circuit
Input be connected, the output end of first timing circuit is connected with an input of second logic circuit,
Second input of second logic circuit receives the switch controlling signal, when output end exports the primary side blanking
Between signal.
9. control circuit according to claim 7, it is characterised in that the secondary blanking time circuit includes the 3rd detection
Circuit, the 3rd logic circuit, the second timing circuit, the 4th logic circuit,
The three testing circuit is used to detect whether the secondary voltage signal is less than the second predetermined value voltage signal, and
Signal is detected to the input output the 3rd of the 3rd logic circuit,
Another input of 3rd logic circuit terminates the sign signal, output end and the input of second timing circuit
End is connected, and the output end of second timing circuit is connected with an input of the 4th logic circuit,
Second input of the 4th logic circuit, which is received, characterizes signal, and output end exports the secondary blanking time letter
Number.
10. control circuit according to claim 6, it is characterised in that when the continued flow tube is diode, the secondary
Controller also includes the on-off circuit being connected with the diodes in parallel, and the secondary control signal is by controlling the switch electricity
The conducting on road and off-state control the secondary voltage signal.
11. control circuit according to claim 10, it is characterised in that when the secondary control signal characterizes the isolation
During the information of the output electric signal of formula converter, the control circuit also includes controlling the main switch according to first detection signal
The drive control circuit of pipe turn-on and turn-off, desired value is maintained with the value for controlling the output electric signal.
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| CN110247553B (en) | 2018-03-09 | 2020-11-06 | 台达电子工业股份有限公司 | Converter and control method thereof |
| CN111711364B (en) * | 2020-06-24 | 2023-03-21 | 电子科技大学 | Self-adaptive leading edge blanking circuit based on high-precision load current detection technology |
| CN115037164B (en) * | 2022-08-12 | 2022-11-18 | 杰华特微电子股份有限公司 | Switch converter with wide-range output and control method thereof |
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| JP2001128449A (en) * | 1999-10-29 | 2001-05-11 | Shindengen Electric Mfg Co Ltd | Flyback switching power source |
| US7619909B2 (en) * | 2007-12-07 | 2009-11-17 | Leadtrend Technology Corp. | Control circuit for adjusting leading edge blanking time and power converting system using the same control circuit |
| CN202840946U (en) * | 2012-09-14 | 2013-03-27 | 成都芯源系统有限公司 | Switch voltage stabilizing circuit and voltage feedback circuit thereof |
| CN103248207A (en) * | 2013-05-21 | 2013-08-14 | 苏州智浦芯联电子科技有限公司 | Constant-current and constant-voltage fly-back converter based on primary side feedback |
| CN103973117A (en) * | 2013-01-31 | 2014-08-06 | 英飞凌科技股份有限公司 | Voltage sensing in voltage converter |
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| JP2001128449A (en) * | 1999-10-29 | 2001-05-11 | Shindengen Electric Mfg Co Ltd | Flyback switching power source |
| US7619909B2 (en) * | 2007-12-07 | 2009-11-17 | Leadtrend Technology Corp. | Control circuit for adjusting leading edge blanking time and power converting system using the same control circuit |
| CN202840946U (en) * | 2012-09-14 | 2013-03-27 | 成都芯源系统有限公司 | Switch voltage stabilizing circuit and voltage feedback circuit thereof |
| CN103973117A (en) * | 2013-01-31 | 2014-08-06 | 英飞凌科技股份有限公司 | Voltage sensing in voltage converter |
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