CN110401353A - A kind of circuit of synchronous rectification and its method for rectifying based on MOS - Google Patents
A kind of circuit of synchronous rectification and its method for rectifying based on MOS Download PDFInfo
- Publication number
- CN110401353A CN110401353A CN201910673200.6A CN201910673200A CN110401353A CN 110401353 A CN110401353 A CN 110401353A CN 201910673200 A CN201910673200 A CN 201910673200A CN 110401353 A CN110401353 A CN 110401353A
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- CN
- China
- Prior art keywords
- mux
- circuit
- voltage detection
- detection circuit
- timer record
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The invention discloses a kind of circuit of synchronous rectification based on MOS, including MOS Drain terminal circuit, voltage detection circuit and secondary circuit, the voltage detection circuit includes: and the concatenated vdet in the end VS (voltage detector)；The voltage detection circuit further includes Mux (multiple selector) and Timer Record (timer), the Mux input terminal is connect with the vdet output end, the Mux output end is connect with the Buf thrust accentuator input terminal, and the Timer Record is in parallel with the Mux.The present invention avoids the surging at the end Drain caused by the time delay because of control by stopping the prediction of output time to secondary current.The Mux added is that multiple selector voluntarily selects the path A for having CMP by Mux voltage detection circuit when Timer Record data, which is not established also, to be completed；After the completion of the foundation of Timer Record data, the path B for having Timer Record is voluntarily selected by Mux voltage detection circuit.
Description
Technical field
The present invention relates to circuit rectifies control technologies, and in particular, to a kind of circuit of synchronous rectification based on MOS and its whole
Stream method.
Background technique
Load is added in the generation of surging, that is, electronic equipment moment, generates the high pressure of moment, has to electronic equipment great
Potential danger gently then causes information loss or electronic component service life covert harm, seriously then causes the damage of equipment or generates more
Serious consequence.Currently, synchronous rectification by detecting rectification metal-oxide-semiconductor D drain end voltage come control rectification MOS open or
It closes.But due to detecting control having time delay, this time delay causes the adverse current of output electric current in turn result in rectification MOS
The surging at the end Drain.The present invention separately reduces the time delay for detecting control with the mode of PREDICTIVE CONTROL, solves the production of surging
It is raw.When the secondary current of circuit of synchronous rectification stops output, the end the Drain voltage for rectifying MOS can become positive pressure from negative pressure.At this time
Voltage detection circuit can send out control signal and turn off rectification MOS.Due to the time delay of control, secondary current is after stopping output
It can be at raw current reflux.This back flow current will cause the surging at the rectification end MOS Drain, injury rectification when turning off rectification MOS
MOS。
Summary of the invention
It is an object of the invention to overcome the deficiencies of existing technologies, provide a kind of circuit of synchronous rectification based on MOS and its
Method for rectifying.
To achieve the above object, the invention adopts the following technical scheme:
A kind of circuit of synchronous rectification based on MOS, including MOS Drain terminal circuit, voltage detection circuit and secondary circuit,
The voltage detection circuit includes: and the concatenated vdet in the end VS (voltage detector)；
The voltage detection circuit further includes Mux (multiple selector) and Timer Record (timer), and the Mux is defeated
Enter end to connect with the vdet output end, the Mux output end is connect with the Buf thrust accentuator input terminal, described
Timer Record is in parallel with the Mux.
A kind of method for rectifying of the circuit of synchronous rectification based on MOS, comprising the following steps:
S10: connection voltage detection circuit, secondary current stop output；
S20: predict that secondary current stops the output time by Timer Record；
S30: when the Timer Record data does not set up completion, there is the path A of CMP by Mux selection；It is described
When Timer Record data establishes completion, there is the path B of Timer Record by Mux selection；
S40:Buf thrust accentuator sends out control signal and closes the end MOS Drain.
Compared with prior art the utility model has the advantages that
A kind of temperature sensitive type fluorescence type phase sequence identification device of the invention has following significant compared to conventional synchronization rectification circuit
Advantage:
The present invention avoids Drain caused by the time delay because of control by the prediction to the secondary current stopping output time
The surging at end.The Mux added is that multiple selector is detectd when Timer Record data, which is not established also, to be completed by Mux voltage
Slowdown monitoring circuit voluntarily selects the path A for having CMP；After the completion of the foundation of Timer Record data, certainly by Mux voltage detection circuit
Row selects the path B for having Timer Record, the length of time detected by above method, either Timer Record,
It can avoid the generation of Drain distal process wave.The voltage detection circuit complete function that the technical program provides, structure is simple, low cost
Honest and clean, long service life has broad application prospects.
It is with reference to the accompanying drawing and specific real in order to be more clearly understood that above-mentioned purpose of the invention, characteristics and advantages
Applying mode, the present invention is described in further detail.
Detailed description of the invention
Fig. 1 is the circuit connection diagram of conventional synchronization rectification circuit；
Fig. 2 is the circuit of synchronous rectification connection schematic diagram provided by the invention based on MOS；
Fig. 3 is conventional rectifier circuit secondary current and the waveform diagram for rectifying the end MOS Drain voltage；
Fig. 4 is the secondary current and the rectification end MOS Drain voltage of the circuit of synchronous rectification provided by the invention based on MOS
Waveform diagram.
Specific embodiment
Many details are elaborated in following specific descriptions to facilitate a thorough understanding of the present invention, still the present invention is gone back
It can be different from the other modes of this description using other to realize, therefore, protection scope of the present invention is not by described below
Specific embodiment limitation.
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Site preparation description, it is clear that described embodiment is some embodiments of the present application, instead of all the embodiments.Based on this Shen
Please in embodiment, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall in the protection scope of this application.
It should be appreciated that ought use in this specification and in the appended claims, term " includes " and "comprising" instruction
Described feature, entirety, step, operation, the presence of element and/or component, but one or more of the other feature, whole is not precluded
Body, step, operation, the presence or addition of element, component and/or its set.
It is also understood that mesh of the term used in this present specification merely for the sake of description specific embodiment
And be not intended to limit the application.As present specification and it is used in the attached claims, unless on
Other situations are hereafter clearly indicated, otherwise " one " of singular, "one" and "the" are intended to include plural form.
It will be further appreciated that the term "and/or" used in present specification and the appended claims is
Refer to any combination and all possible combinations of one or more of associated item listed, and including these combinations.
The predicted time that prediction secondary current stops output being needed with height accuracy, if stopped in secondary current defeated
Turn off rectification MOS too early before stopping output out, will cause decrease in efficiency.Electronic Components&Supplies
For electronic component and system, the label of each electronic component is represented in following specific embodiments with " s " plus Arabic numerals, with
It is consistent in attached drawing.
As shown in Figs. 1-2, a kind of circuit of synchronous rectification based on MOS provided by the invention, including the end MOS Drain electricity
Road, voltage detection circuit and secondary circuit, voltage detection circuit include: and the concatenated vdet in the end VS (voltage detector)；
Voltage detection circuit further includes Mux (multiple selector) and Timer Record s20 (timer), and Mux s30 is defeated
Enter end to connect with vdet s10 output end, Mux s30 output end is connect with Buf thrust accentuator input terminal, Timer
Record s20 is in parallel with Mux s30.
Vdet s10 is voltage detector, is used for monitoring voltage (such as cell voltage), and indicate to the user that voltage is low.Voltage
Detector does not have delay usually, but they have built-in lag, production when preventing voltage to be suspended near threshold voltage
Raw false triggering phenomenon.
Mux s30 is multi-channel data selector, and data selector refers to by selection, and the data transmission in multiple channels is arrived
Unique common data channel gets on, and realizes that the logic circuit of data selection function is known as data selector.It is passed in multichannel data
During sending, the circuit that will wherein arbitrarily can be elected all the way as needed is called data selector, also referred to as multiple selector
Or variable connector.
Buf s40 is thrust accentuator, by increasing thrust to open or close MOS Drain terminal circuit.
As shown in Figure 3-4, in the waveform diagram of the secondary current of traditional circuit and the rectification end MOS Drain voltage, secondary side electricity
The output time TS of stream includes the detecting delay time of secondary current itself output time and voltage detection circuit, that is, there is rectification
The detecting delay time td at the end MOS Drain.Circuit secondary current and the rectification end MOS Drain voltage after prediction circuit is added
Waveform diagram in, it can be seen that secondary current output time TS be equal to prediction circuit predicted time, when eliminating delay
Between, and then eliminate the surging at the end MOS Drain.
A kind of method for rectifying of the circuit of synchronous rectification based on MOS, comprising the following steps:
S10: connection voltage detection circuit, secondary current stop output；
S20: predict that secondary current stops the output time by Timer Record s20；
When S30:Timer Record s20 data does not set up completion, there is the path A of CMP by Mux s30 selection；
When Timer Record s20 data establishes completion, there is the path B of Timer Record s20 by Mux s30 selection；
S40:Bufs40 thrust accentuator sends out control signal and closes the end MOS Drain.
In conclusion the present invention avoids the time delay because of control by the prediction to the secondary current stopping output time
Cause the surging at the end Drain.The Mux added is that multiple selector passes through when Timer Record data, which is not established also, to be completed
Mux voltage detection circuit voluntarily selects the path A for having CMP；After the completion of the foundation of Timer Record data, pass through Mux voltage
Circuit for detecting voluntarily selects the path B for having Timer Record, by above method, either Timer Record detecting when
Between length, can avoid Drain distal process wave generation.The voltage detection circuit complete function that the technical program provides, structure letter
Single, cheap, long service life has broad application prospects.
It is above-mentioned that technology contents of the invention are only further illustrated with embodiment, in order to understand, but do not represent the present invention
Embodiment be only limitted to this, it is any to extend according to the technology done of the present invention or recreation, by protection of the invention.This hair
Bright protection scope is subject to claims.
Claims (2)
1. a kind of circuit of synchronous rectification based on MOS, including MOSDrain terminal circuit, voltage detection circuit and secondary circuit, institute
Stating voltage detection circuit includes: and the concatenated vdet in the end VS；
It is characterized in that, the voltage detection circuit further includes Mux and Timer Record, the Mux input terminal with it is described
The connection of vdet output end, the Mux output end are connect with the Buf thrust accentuator input terminal, the Timer Record
It is in parallel with the Mux.
2. a kind of method for rectifying of the circuit of synchronous rectification based on MOS, which comprises the following steps:
S10: connection voltage detection circuit, secondary current stop output；
S20: predict that secondary current stops the output time by Timer Record；
S30: when the Timer Record data does not set up completion, there is the path A of CMP by Mux selection；The Timer
When Record data establishes completion, there is the path B of Timer Record by Mux selection；
S40: the Buf thrust accentuator sends out control signal and closes the end MOSDrain.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910673200.6A CN110401353A (en) | 2019-07-24 | 2019-07-24 | A kind of circuit of synchronous rectification and its method for rectifying based on MOS |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910673200.6A CN110401353A (en) | 2019-07-24 | 2019-07-24 | A kind of circuit of synchronous rectification and its method for rectifying based on MOS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110401353A true CN110401353A (en) | 2019-11-01 |
Family
ID=68324899
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910673200.6A Pending CN110401353A (en) | 2019-07-24 | 2019-07-24 | A kind of circuit of synchronous rectification and its method for rectifying based on MOS |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110401353A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103501112A (en) * | 2013-10-12 | 2014-01-08 | 矽力杰半导体技术(杭州)有限公司 | Synchronous rectification control method, synchronous rectification control circuit and switch-type voltage regulator |
| CN107888092A (en) * | 2016-09-29 | 2018-04-06 | 登丰微电子股份有限公司 | Power supply conversion device |
| US10063159B1 (en) * | 2017-06-30 | 2018-08-28 | Dialog Semiconductor Inc. | Adaptive synchronous rectifier sensing deglitch |
-
2019
- 2019-07-24 CN CN201910673200.6A patent/CN110401353A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103501112A (en) * | 2013-10-12 | 2014-01-08 | 矽力杰半导体技术(杭州)有限公司 | Synchronous rectification control method, synchronous rectification control circuit and switch-type voltage regulator |
| CN107888092A (en) * | 2016-09-29 | 2018-04-06 | 登丰微电子股份有限公司 | Power supply conversion device |
| US10063159B1 (en) * | 2017-06-30 | 2018-08-28 | Dialog Semiconductor Inc. | Adaptive synchronous rectifier sensing deglitch |
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Application publication date: 20191101 |
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