CN117155136B - Synchronous rectification control circuit and method for inhibiting ringing false turn-on of rectifier tube - Google Patents
Synchronous rectification control circuit and method for inhibiting ringing false turn-on of rectifier tube Download PDFInfo
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- CN117155136B CN117155136B CN202311406848.XA CN202311406848A CN117155136B CN 117155136 B CN117155136 B CN 117155136B CN 202311406848 A CN202311406848 A CN 202311406848A CN 117155136 B CN117155136 B CN 117155136B
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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
- 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
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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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
-
- 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
-
- 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
Abstract
A synchronous rectification control circuit and method for restraining the false turn-on of rectifier tube ringing includes a turn-off shielding setting unit for setting the turn-off shielding time of rectifier MOS tube. The turn-off shielding setting unit comprises a monitoring circuit, a gain setting circuit and a turn-off time setting circuit, wherein the monitoring circuit monitors voltage signals between the drain electrode and the source electrode of the rectifying MOS tube, and outputs a second preset voltage signal to the gain switching circuit when the first monitoring voltage signal is larger than a preset first preset voltage signal. The gain switching circuit outputs the gain A times of the second preset voltage signal to the turn-off time setting circuit. And the turn-off time setting circuit adjusts turn-off shielding time of the rectifying MOS tube according to a comparison result of the first gain voltage signal and the second preset voltage signal. The turn-off shielding time of the rectifier MOS transistor is dynamically adjusted according to the actual working voltage of the rectifier MOS transistor, so that the synchronous rectifier circuit can not be switched on by mistake due to multi-period oscillation, and the reliability of the whole system is improved.
Description
Technical Field
The invention relates to the technical field of power electronic converters, in particular to a synchronous rectification control circuit and a control method for inhibiting the false turn-on of a rectifier tube ringing.
Background
The synchronous rectification technology replaces the traditional diode with an MOS tube with lower on resistance, and the efficiency of the converter can be greatly improved by adopting the synchronous rectification technology. The MOS tube is driven to have ringing phenomenon, the parasitic capacitance and inductance resonance of the MOS tube cause the ringing phenomenon, the parasitic inductance transfers energy to the parasitic capacitance to charge in the switching process of the MOS tube, and the parasitic capacitance releases electric energy to store energy for the parasitic inductance after the charging is finished, and the cycle is repeated. The ringing phenomenon of the MOS transistor can cause the synchronous rectifying tube to be turned on by mistake, and the method for solving the problem of the false turn-on of the synchronous rectifying tube in the prior art is to add a fixed or set delay time or a strategic delay time when the drain-source voltage of the synchronous rectifying tube reaches an on threshold value, then turn on the synchronous rectifying tube again, and add a fixed or set or strategic turn-off shielding time when the drain-source voltage of the synchronous rectifying tube reaches an off threshold value, and in this time, the synchronous rectifying tube cannot be turned on again (see the Chinese patent document with publication number CN106711955 a). The problem with this approach is that the secondary current state is constantly changing, with and without oscillations, in the face of different application conditions, different system conditions, different load or input conditions, and that it is very difficult to give a proper and accurate time. If the given time is longer, the synchronous rectifying tube is delayed to be opened, so that efficiency is lost, and if the given time is shorter, the synchronous rectifying tube is opened by mistake, so that the control effect cannot be achieved.
Disclosure of Invention
The method mainly solves the technical problem of how to inhibit the false opening of the rectifying tube due to ringing phenomenon.
According to a first aspect, in one embodiment, a synchronous rectification control circuit for suppressing false turn-on of a rectifier tube ringing is provided, including at least one turn-off mask setting unit, where the turn-off mask setting unit is configured to set a turn-off mask time of a rectifier MOS tube, so as to suppress false turn-on of the rectifier MOS tube due to the ringing phenomenon;
the turn-off shielding setting unit comprises a monitoring circuit, a gain setting circuit and a turn-off time setting circuit; the monitoring circuit is used for monitoring the voltage signal between the drain electrode and the source electrode of the rectifying MOS tube, and acquiring a first monitoring voltage signal V DS And a preset first preset voltage signalV th Comparing and outputting a first comparison result electric signal obtained by comparison to the gain setting circuit;
the gain setting circuit comprises a first voltage source circuit and a gain switching circuit, wherein the first voltage source circuit is used for generating a first monitoring voltage signal V DS Is greater than the first preset voltage signal V th Outputting a second preset voltage signal V to the gain switching circuit 1 The method comprises the steps of carrying out a first treatment on the surface of the The gain switching circuit is used for switching the second preset voltage signal V 1 Gain A times, and gain-acquired first gain voltage signal V A Outputting to the off time setting circuit; wherein the gain multiple A is a preset constant;
the turn-off time setting circuit is used for setting the first gain voltage signal V A And the second preset voltage signal V 1 Comparing and according to the first gain voltage signal V A And the second preset voltage signal V 1 And (3) adjusting the turn-off shielding time of the rectifying MOS tube.
In one embodiment, the monitoring circuit includes a first connection terminal, a second connection terminal, a third connection terminal, and a first comparator U1;
a first connection terminal of the monitoring circuit is used for the first preset voltage signal V th Is input to the computer;
the second connection end of the monitoring circuit is used for the first monitoring voltage signal V DS Is input to the computer;
the third connecting end of the monitoring circuit is connected with the gain setting circuit and is used for outputting the first comparison result electric signal;
the positive input end of the first comparator U1 is connected with the first connecting end of the monitoring circuit, the negative input end of the first comparator U1 is connected with the second connecting end of the monitoring circuit, and the output end of the first comparator U1 is connected with the third connecting end of the monitoring circuit.
In one embodiment, the first voltage source circuit includes a first connection terminal, a second connection terminal, a third connection terminal, and a first switch circuit S 1 And a first electricityCapacitor C 1 ；
The first connection end of the first voltage source circuit is connected with the monitoring circuit and is used for inputting the first comparison result electric signal;
the second connection end of the first voltage source circuit is used for the second preset voltage signal V 1 Is input to the computer;
the third connection end of the first voltage source circuit is connected with the gain switching circuit and is used for outputting the second preset voltage signal V 1 ；
The first switch circuit S 1 Is connected with a third connecting end of the first voltage source circuit, and the other end is grounded; the first switch circuit S 1 For when said first monitor voltage signal V DS Is greater than the first preset voltage signal V th When the second preset voltage signal V is generated 1 Outputting a second preset voltage signal V to the gain switching circuit through a third connection end of the first voltage source circuit 1 ；
The first capacitor C 1 Is connected to the third connection terminal of the first voltage source circuit, and the other terminal is grounded.
In one embodiment, the gain switching circuit includes a first connection terminal, a second connection terminal, a third connection terminal, a first voltage multiplier, and a second switching circuit S 2 Third switch circuit S 3 And a second capacitor C 2 ；
The first connection end of the gain switching circuit is connected with the first voltage source circuit and is used for the second preset voltage signal V 1 Is input to the computer;
the second connecting end and the third connecting end of the gain switching circuit are respectively connected with the turn-off time setting circuit;
the second switch circuit S 2 One end of the first voltage multiplier is connected with the first connecting end of the gain switching circuit, and the other end of the first voltage multiplier is connected with the positive input end of the first voltage multiplier;
the negative input end of the first voltage multiplier is grounded, the output end of the first voltage multiplier is connected with the second connecting end of the gain switching circuit, and the gain multiple value of the first voltage multiplier is a preset constant A;
the third switch circuit S 3 One end of the gain switching circuit is connected with the second connecting end of the gain switching circuit, and the other end of the gain switching circuit is connected with the third connecting end of the gain switching circuit;
the second capacitor C 2 Is connected with the third connecting end of the gain switching circuit, and the other end is grounded.
In one embodiment, the gain switching circuit further includes a third capacitor C 3 And a fourth capacitor C 4 ；
The third capacitor C 3 One end of the first voltage multiplier is connected with the positive input end of the first voltage multiplier, and the other end of the first voltage multiplier is grounded;
the fourth capacitor C 4 One end of the first voltage multiplier is connected with the output end of the first voltage multiplier, and the other end of the first voltage multiplier is grounded.
In one embodiment, the off-time setting circuit includes a first connection terminal, a second connection terminal, and a second comparator U2;
the first connecting end of the turn-off time setting circuit is connected with the second connecting end of the gain switching circuit, and the second connecting end of the turn-off time setting circuit is connected with the third connecting end of the gain switching circuit;
the positive input end of the second comparator U2 is connected with the first connection end of the turn-off time setting circuit, and the negative input end of the second comparator U2 is connected with the second connection end of the turn-off time setting circuit.
In one embodiment, the off-time setting circuit is configured to control the first gain voltage signal V A And the second preset voltage signal V 1 The step of adjusting the turn-off shielding time of the rectifying MOS tube comprises the following steps:
when the first gain voltage signal V A Not greater than the second preset voltage signal V 1 Setting the turn-off shielding time of the rectifying MOS tube as a first preset time T Z1 The method comprises the steps of carrying out a first treatment on the surface of the Wherein, the first preset time T Z1 Is a preset value;
when the house is atThe first gain voltage signal V A Is greater than the second preset voltage signal V 1 Setting the turn-off shielding time of the rectifying MOS tube as a second preset time T Z1-new The method comprises the steps of carrying out a first treatment on the surface of the Wherein the second preset time T Z1-new Is greater than a first preset time T Z1 The method comprises the steps of carrying out a first treatment on the surface of the The second preset time T Z1-new Relative to a first preset time T Z1 Is related to the gain multiple a.
In one embodiment, the second preset time T Z1-new For the first preset time T Z1 A product of the gain multiple A and the second preset time T Z1-new And the duration time of the high-voltage signal between the grid electrode and the source electrode of the rectifying MOS tube in the same period of operation is not more than the duration time of the high-voltage signal between the grid electrode and the source electrode of the rectifying MOS tube in the same period of operation.
In an embodiment, the number of the turn-off shielding setting units is the same as the number of the rectifying MOS transistors, and each turn-off shielding setting unit sets a turn-off shielding time of one rectifying MOS transistor.
According to a second aspect, in one embodiment, there is provided a synchronous rectification control method for suppressing false turn-on of a rectifier tube ringing for application to a synchronous rectification control circuit as described above, the synchronous rectification control method comprising:
monitoring a voltage signal between the drain electrode and the source electrode of the rectifying MOS tube to obtain a first monitoring voltage signal V DS ；
Acquiring a first monitoring voltage signal V DS And a preset first preset voltage signal V th Comparing; when the first monitoring voltage signal V DS Is greater than the first preset voltage signal V th When the voltage is higher than a predetermined voltage, the voltage is higher than the predetermined voltage 1 Gain A times to obtain a first gain voltage signal V A The gain multiple A is a preset constant;
for the first gain voltage signal V A And the second preset voltage signal V 1 Comparing and according to the first gain voltage signal V A And the second preset voltage signal V 1 And (3) adjusting the turn-off shielding time of the rectifying MOS tube.
According to the synchronous rectification control method of the embodiment, the oscillation state of the synchronous rectification MOS tube is obtained by monitoring the voltage signal between the drain electrode and the source electrode of the rectification MOS tube, and the shielding time of the next working period is properly increased, so that the synchronous rectification circuit is ensured not to be wrongly turned on due to the ringing phenomenon of the rectification MOS tube, the reliability of the whole rectification circuit is improved, and when the rectification circuit does not oscillate, only the default small shielding time is kept, so that the synchronous rectification circuit is not turned on in a delayed manner, and the overall performance of a system is improved.
Drawings
FIG. 1 is a schematic diagram of a circuit configuration of a shut-down mask setting unit according to an embodiment;
FIG. 2 is a flow chart of a synchronous rectification control method according to an embodiment;
FIG. 3 is a schematic diagram of circuit connections of a synchronous rectification control circuit based on an LLC switching power supply in one embodiment;
FIG. 4 is a schematic waveform diagram of the normal operation of an LLC switching power supply in one embodiment;
FIG. 5 is a schematic waveform diagram of an LLC switching power supply according to an embodiment when a rectifier tube ringing phenomenon occurs;
FIG. 6 is a schematic diagram of waveforms when ringing occurs in an LLC switching power supply according to another embodiment;
FIG. 7 is a circuit schematic of a synchronous rectification control circuit based on an LLC switching power supply in one embodiment;
FIG. 8 is a switching power supply circuit based on Flyback synchronous rectification technology in one embodiment;
fig. 9 is a switching power supply circuit based on the AHB synchronous rectification technique in one embodiment.
Detailed Description
The invention will be described in further detail below with reference to the drawings by means of specific embodiments. Wherein like elements in different embodiments are numbered alike in association. In the following embodiments, numerous specific details are set forth in order to provide a better understanding of the present application. However, one skilled in the art will readily recognize that some of the features may be omitted, or replaced by other elements, materials, or methods in different situations. In some instances, some operations associated with the present application have not been shown or described in the specification to avoid obscuring the core portions of the present application, and may not be necessary for a person skilled in the art to describe in detail the relevant operations based on the description herein and the general knowledge of one skilled in the art.
Furthermore, the described features, operations, or characteristics of the description may be combined in any suitable manner in various embodiments. Also, various steps or acts in the method descriptions may be interchanged or modified in a manner apparent to those of ordinary skill in the art. Thus, the various orders in the description and drawings are for clarity of description of only certain embodiments, and are not meant to be required orders unless otherwise indicated.
The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The terms "coupled" and "connected," as used herein, are intended to encompass both direct and indirect coupling (coupling), unless otherwise indicated.
In the embodiment of the application, the oscillation state is obtained by monitoring the voltage signal between the drain electrode and the source electrode of the rectifying MOS tube, and the shielding time of the next working period is properly increased, so that the synchronous rectifying circuit is ensured not to be wrongly turned on due to the ringing phenomenon of the rectifying MOS tube, the reliability of the whole rectifying circuit is improved, and when the rectifying circuit does not oscillate, only the default small shielding time is kept, so that the synchronous rectifying circuit cannot be turned on in a delayed manner, and the overall performance of the system is improved.
Example 1
Please refer to fig. 1, which is a schematic circuit diagram of a shutdown mask setting unit in an embodiment, in which the synchronous rectification control circuit includes at least one shutdown mask setting unit 1, and the shutdown mask setting unit 1 is used for setting a shutdown mask of a rectification MOS transistorAnd time is spent to inhibit the false turn-on of the rectifying MOS tube due to ringing phenomenon. The off-mask setting unit 1 includes a monitoring circuit 10, a gain setting circuit 20, and an off-time setting circuit 30. The monitoring circuit 10 is used for monitoring a voltage signal between the drain and the source of the rectifying MOS transistor to obtain a first monitored voltage signal V DS And a preset first preset voltage signal V th The comparison is performed, and the first comparison result electric signal obtained by the comparison is output to the gain setting circuit 20. The gain setting circuit 20 includes a first voltage source circuit 21 and a gain switching circuit 22, the first voltage source circuit 21 is used for generating a first monitor voltage signal V DS Is greater than the first preset voltage signal V th Outputs a second preset voltage signal V to the gain switching circuit 22 1 . The gain switching circuit 22 is used for outputting a second preset voltage signal V 1 Gain A times, and gain-acquired first gain voltage signal V A To the off-time setting circuit 30. The gain multiple A is a preset constant. The turn-off time setting circuit is used for setting the first gain voltage signal V A And a second preset voltage signal V 1 Comparing and according to the first gain voltage signal V A And a second preset voltage signal V 1 And (3) adjusting the turn-off shielding time of the rectifying MOS tube.
In one embodiment, the monitoring circuit 10 includes a first connection terminal, a second connection terminal, a third connection terminal, and a first comparator U1. The first connection terminal of the monitoring circuit 10 is used for a first preset voltage signal V th A second connection of the monitoring circuit 10 is used for a first monitoring voltage signal V DS The third connection terminal of the monitor circuit 10 is connected to the gain setting circuit for outputting the first comparison result electric signal. The positive input end of the first comparator U1 is connected with the first connecting end of the monitoring circuit, the negative input end of the first comparator U1 is connected with the second connecting end of the monitoring circuit 10, and the output end of the first comparator U1 is connected with the third connecting end of the monitoring circuit 10. In one embodiment, the first voltage source circuit 21 includes a first connection terminal, a second connection terminal, a third connection terminal, and a first switch circuit S 1 And a first capacitor C 1 . The first connection terminal of the first voltage source circuit 21 and the monitor powerThe circuit 10 is connected for input of the first comparison result electrical signal. The second connection terminal of the first voltage source circuit 21 is used for a second preset voltage signal V 1 Is input to the computer. A third connection terminal of the first voltage source circuit 21 is connected to the gain switching circuit 22 for outputting a second preset voltage signal V 1 . First switch circuit S 1 Is connected to the third connection terminal of the first voltage source circuit 21, and the other terminal is grounded. First switch circuit S 1 For detecting the voltage signal V when the first monitor voltage signal DS Is greater than the first preset voltage signal V th Will be a second preset voltage signal V 1 The second preset voltage signal V is output to the gain switching circuit 22 through the third connection terminal of the first voltage source circuit 21 1 . First capacitor C 1 Is connected to the third connection terminal of the first voltage source circuit 21, and the other terminal is grounded. In one embodiment, the gain switching circuit 22 includes a first connection terminal, a second connection terminal, a third connection terminal, a first voltage multiplier, and a second switching circuit S 2 Third switch circuit S 3 And a second capacitor C 2 . The first connection end of the gain switching circuit 22 is connected to the first voltage source circuit 21 for a second predetermined voltage signal V 1 Is input to the computer. The second connection terminal and the third connection terminal of the gain switching circuit 22 are respectively connected to the off-time setting circuit 30. Second switch circuit S 2 Is connected to the first connection of the gain switching circuit 22 and the other end is connected to the positive input of the first voltage multiplier. The negative input end of the first voltage multiplier is grounded, the output end of the first voltage multiplier is connected with the second connection end of the gain switching circuit 22, and the gain multiple value of the first voltage multiplier is a preset constant A. Third switch circuit S 3 Is connected to the second connection terminal of the gain switching circuit 22, and is connected to the third connection terminal of the gain switching circuit 22. Second capacitor C 2 Is connected to the third connection terminal of the gain switching circuit 22, and the other terminal is grounded. In one embodiment, the gain switching circuit 22 further includes a third capacitor C 3 And a fourth capacitor C 4 . Third capacitor C 3 One end of the first voltage multiplier is connected with the positive input end of the first voltage multiplier, and the other end of the first voltage multiplier is grounded. Fourth capacitor C 4 One end and the firstThe output end of a voltage multiplier is connected, and the other end of the voltage multiplier is grounded. In one embodiment, the off-time setting circuit 30 includes a first connection terminal, a second connection terminal, and a second comparator U2. The first connection terminal of the off-time setting circuit 30 is connected to the second connection terminal of the gain switching circuit 22, and the second connection terminal of the off-time setting circuit 30 is connected to the third connection terminal of the gain switching circuit 22. The positive input end of the second comparator U2 is connected to the first connection end of the off-time setting circuit 30, and the negative input end of the second comparator U2 is connected to the second connection end of the off-time setting circuit 30.
In one embodiment, the turn-off time setting circuit 30 is based on the first gain voltage signal V A And a second preset voltage signal V 1 The step of adjusting the turn-off shielding time of the rectifying MOS tube according to the comparison result comprises the following steps: when the first gain voltage signal V A Is not greater than a second preset voltage signal V 1 Setting the turn-off shielding time of the rectifying MOS tube as a first preset time T Z1 Wherein, a first preset time T Z1 Is a preset value; when the first gain voltage signal V A Is greater than the second preset voltage signal V 1 Setting the turn-off shielding time of the rectifying MOS tube as a second preset time T Z1-new Wherein the second preset time T Z1-new Is greater than a first preset time T Z1 . A second preset time T Z1-new Relative to a first preset time T Z1 The increase in (2) is related to the gain multiple a. In one embodiment, the second preset time T Z1-new For a first preset time T Z1 Product with gain multiple A, and a second preset time T Z1-new The duration time of the high-voltage signal between the grid electrode and the source electrode of the rectifying MOS tube in the same period of operation is not longer than that of the high-voltage signal between the grid electrode and the source electrode of the rectifying MOS tube.
In an embodiment, the number of the off-shielding setting units 1 in the synchronous rectification control circuit is the same as the number of the rectification MOS transistors, and each off-shielding setting unit 1 sets the off-shielding time of one rectification MOS transistor.
In an embodiment, the present application further discloses a synchronous rectification control method for suppressing a ringing false turn-on of a rectifier tube, which is applied to the synchronous rectification control circuit described above, please refer to fig. 2, which is a schematic flow chart of the synchronous rectification control method in an embodiment, and the synchronous rectification control method includes:
step 101, a first monitoring voltage signal is obtained.
Monitoring a voltage signal between the drain electrode and the source electrode of the rectifying MOS tube to obtain a first monitoring voltage signal V DS 。
Step 102, a first gain voltage signal is obtained.
Acquiring a first monitoring voltage signal V DS And a preset first preset voltage signal V th Comparing when the first monitor voltage signal V DS Is greater than the first preset voltage signal V th When the voltage is higher than a predetermined voltage, the voltage is higher than the predetermined voltage 1 Gain A times to obtain a first gain voltage signal V A The gain multiple a is a preset constant.
Step 103, adjusting the off-mask time.
For the first gain voltage signal V A And a second preset voltage signal V 1 Comparing and according to the first gain voltage signal V A And a second preset voltage signal V 1 And (3) adjusting the turn-off shielding time of the rectifying MOS tube.
The synchronous rectification control method disclosed by the application is described below through a specific embodiment, and specifically includes:
referring to fig. 3, a schematic circuit connection diagram of a synchronous rectification control circuit based on an LLC switching power supply in an embodiment is shown, where the synchronous rectification control circuit 100 is connected to a first rectification MOS transistor S1 and a second rectification MOS transistor S2 of an output circuit.
Please refer to fig. 4, which is a schematic diagram of waveforms of normal operation of the LLC switching power supply in one embodiment, it can be seen from the waveforms that V is detected in real time during normal operation DS Is used for controlling the V of the MOSFET GS In one embodiment of the present application by introducing a control parameter V th In real time detecting V DS Through the parameter V th And rectifying MOS tube V DS Voltage is compared when V DS Voltage higher than the parameter V th V at the time of DS1 And V DS2 Is placed at high position when V DS Voltage lower than the parameter V th V at the time of DS1 And V DS2 Is placed in a low position. V (V) DS1 And V DS2 Three time periods, t, respectively, occur in the waveform of (a) 2-0 、t 2-1 And t 1-1 . At the same time, a control parameter A is introduced, t is calculated 2-0 、t 2-1 And t 1-1 To be connected. As can be seen from fig. 4, when the LLC switching power supply is in a normal operating state, two equations are satisfied, which are respectively:
t 1-1 <A* t 2-1 ；
t 2-1 <A* t 2-0 ；
the parameter a may be a preset design parameter, so that the formula is satisfied in a normal working state.
The masking times for the two channels under normal operating conditions are set to be Tz1 and Tz2 as default times. V of either channel is not allowed during the time period of Tz1 and Tz2 GS And if the voltage is high, namely, in the time period of Tz1 and Tz2, the rectifying MOS tube of any channel is not allowed to be opened.
Please refer to fig. 5, which is a waveform diagram illustrating a ringing phenomenon of an LLC switching power supply in an embodiment, in which the synchronous rectification V of the LLC switching power supply DS1 Oscillating work, V DS1 And V DS2 The waveform of (c) will change. Compared with the normal waveform of FIG. 4, three time periods occur, t 2-0 、t 2-1 And t 1-1 The same changes occur. Thus, two equations relating to parameter a will also change, specifically:
t 1-1 <A* t 2-1 ；
t 2-1 >A*t 2-0 ；
the parameter A is the same as the parameter A set in the normal working state. After the equation related to parameter a is changed, the masking time of the two channels is set to be equal to Tz1, and Tz2 is changed to Tz2_new.
Referring to FIG. 6, a waveform diagram of an LLC switching power supply with synchronous rectification V in another embodiment is shown when ringing occurs DS2 Oscillating work, V DS1 And V DS2 The waveform of (c) will change. Compared with the normal waveform of FIG. 4, three time periods occur, t 2-0 、t 2-1 And t 1-1 The same changes occur. Thus, two equations relating to parameter a will also change, specifically:
t 1-1 >A*t 2-1 ；
t 2-1 >A*t 2-0 ；
the parameter A is the same as the parameter A set in the normal working state. The masking time of the two channels becomes tz1_new and tz2_new.
As can be seen from the above specific embodiments, the synchronous rectification control method claimed in the present application can detect V very accurately DS The oscillation state of the system is improved, and the shielding time of the next period can be properly increased, so that the synchronous rectification control circuit is prevented from being started by mistake due to the fact that the DCM oscillation of multiple periods occurs, the reliability of the system is improved, and when the system does not oscillate, the shielding time of the default is kept to be smaller, the system is prevented from being started by delay, and the performance of the system is improved.
Referring to fig. 7, a circuit schematic diagram of a synchronous rectification control circuit based on an LLC switching power supply in an embodiment, the synchronous rectification control circuit 100 includes two turn-off mask setting units 1, and each turn-off mask setting unit 1 sets a turn-off mask time of one rectification MOS transistor in the LLC switching power supply. The time information t is fed through the first comparator of the two shut-off mask setting units 1 1-1 、t 2-1 And t 2-0 Converting into voltage information V1, controlling each switching tube circuit (a first switching circuit S1, a second switching circuit S2 and a third switching circuit S3) by using detection control logic, sending signals into a first voltage multiplier or a second comparator, respectively outputting comparison results by the second comparators of the two turn-off shielding setting units 1 to be increased to T z1_new Or default T z1 Time. It detects V DS The time sequence of the voltage has a certain rule and sequence, and two effective detection sequence logics exist in total, so that the T can be confirmed fastest z Values. In one embodiment, the detection control logic is as follows:
1. detection of V DS2 After which t is obtained 2-1 Time period, detection V DS1 After which t is obtained 1-1 Time period, t 2-1 Time period and t 1-1 The comparison of the time periods can confirm T z1 Detection of V DS2 After which t is obtained 2-0 Time period, detection V DS2 After which t is obtained 2-1 Time period, t 2-0 Time period and t 2-1 The comparison of the time periods can confirm T z2 。
2. Detection of V DS2 After which t is obtained 2-0 Time period, again detect V DS2 After which t is obtained 2-1 Time period, t 2-0 Time period and t 2-1 The comparison of the time periods can confirm T z2 Detection of V DS1 After which t is obtained 1-1 Time period, t 2-1 Time period and t 1-1 The comparison of the time periods can confirm T z1 ；
The detection control logic can rapidly confirm the shielding time T through detection and comparison z1 And T is z2 . It should be emphasized that the control strategy is not limited to be used in LLC switching power supplies, and referring to fig. 8 and 9, which are switching power supply circuits based on the Flyback synchronous rectification technique and the AHB synchronous rectification technique, respectively, and when there is only one synchronous rectification MOS transistor, the confirmation T can be used as well z2 For T z2 Effectively controlling the masking time of the (c). Thereby achieving the purpose of detecting and inhibiting the false opening of ringing.
The synchronous rectification control circuit for inhibiting the ringing false turn-on of the rectifying tube comprises a turn-off shielding setting unit for setting the turn-off shielding time of the rectifying MOS tube. The turn-off shielding setting unit comprises a monitoring circuit, a gain setting circuit and a turn-off time setting circuit, wherein the monitoring circuit monitors voltage signals between the drain electrode and the source electrode of the rectifying MOS tube, and outputs a second preset voltage signal to the gain switching circuit when the first monitoring voltage signal is larger than a preset first preset voltage signal. The gain switching circuit outputs the gain A times of the second preset voltage signal to the turn-off time setting circuit. And the turn-off time setting circuit adjusts turn-off shielding time of the rectifying MOS tube according to a comparison result of the first gain voltage signal and the second preset voltage signal. The turn-off shielding time of the rectifier MOS transistor is dynamically adjusted according to the actual working voltage of the rectifier MOS transistor, so that the synchronous rectifier circuit can not be switched on by mistake due to multi-period oscillation, and the reliability of the whole system is improved.
The foregoing description of the invention has been presented for purposes of illustration and description, and is not intended to be limiting. Several simple deductions, modifications or substitutions may also be made by a person skilled in the art to which the invention pertains, based on the idea of the invention.
Claims (8)
1. The synchronous rectification control circuit for inhibiting the false turn-on of the rectifier tube is characterized by comprising at least one turn-off shielding setting unit, wherein the turn-off shielding setting unit is used for setting the turn-off shielding time of the rectifier MOS tube so as to inhibit the false turn-on of the rectifier MOS tube due to the ringing phenomenon;
the turn-off shielding setting unit comprises a monitoring circuit, a gain setting circuit and a turn-off time setting circuit; the monitoring circuit is used for monitoring the voltage signal between the drain electrode and the source electrode of the rectifying MOS tube, and acquiring a first monitoring voltage signal V DS And a preset first preset voltage signal V th Comparing and outputting a first comparison result electric signal obtained by comparison to the gain setting circuit;
the gain setting circuit comprises a first voltage source circuit and a gain switching circuit, wherein the first voltage source circuit is used for generating a first monitoring voltage signal V DS Is greater than the first preset voltage signal V th Outputting a second preset voltage signal V to the gain switching circuit 1 The method comprises the steps of carrying out a first treatment on the surface of the The gain switching circuit is used for switching the second preset voltage signal V 1 Gain A times, and gain-acquired first gain voltage signal V A Outputting to the off time setting circuit; wherein the gain multiple A is a preset constant;
the turn-off time setting circuit is used for setting the first gain voltage signal V A And institute(s)The second preset voltage signal V 1 Comparing and according to the first gain voltage signal V A And the second preset voltage signal V 1 The comparison result of the (a) is used for adjusting the turn-off shielding time of the rectification MOS tube;
the turn-off time setting circuit is based on the first gain voltage signal V A And the second preset voltage signal V 1 The step of adjusting the turn-off shielding time of the rectifying MOS tube comprises the following steps:
when the first gain voltage signal V A Not greater than the second preset voltage signal V 1 Setting the turn-off shielding time of the rectifying MOS tube as a first preset time T Z1 The method comprises the steps of carrying out a first treatment on the surface of the Wherein, the first preset time T Z1 Is a preset value;
when the first gain voltage signal V A Is greater than the second preset voltage signal V 1 Setting the turn-off shielding time of the rectifying MOS tube as a second preset time T Z1-new The method comprises the steps of carrying out a first treatment on the surface of the Wherein the second preset time T Z1-new Is greater than a first preset time T Z1 The method comprises the steps of carrying out a first treatment on the surface of the The second preset time T Z1-new Relative to a first preset time T Z1 Is related to the gain multiple a;
the second preset time T Z1-new For the first preset time T Z1 A product of the gain multiple A and the second preset time T Z1-new And the duration time of the high-voltage signal between the grid electrode and the source electrode of the rectifying MOS tube in the same period of operation is not more than the duration time of the high-voltage signal between the grid electrode and the source electrode of the rectifying MOS tube in the same period of operation.
2. The synchronous rectification control circuit of claim 1, wherein said monitoring circuit includes a first connection, a second connection, a third connection, and a first comparator U1;
a first connection terminal of the monitoring circuit is used for the first preset voltage signal V th Is input to the computer;
the second connection end of the monitoring circuit is used for the first monitoring voltage signal V DS Is input to the computer;
the third connecting end of the monitoring circuit is connected with the gain setting circuit and is used for outputting the first comparison result electric signal;
the positive input end of the first comparator U1 is connected with the first connecting end of the monitoring circuit, the negative input end of the first comparator U1 is connected with the second connecting end of the monitoring circuit, and the output end of the first comparator U1 is connected with the third connecting end of the monitoring circuit.
3. The synchronous rectification control circuit of claim 1, wherein said first voltage source circuit includes a first connection terminal, a second connection terminal, a third connection terminal, a first switching circuit S 1 And a first capacitor C 1 ；
The first connection end of the first voltage source circuit is connected with the monitoring circuit and is used for inputting the first comparison result electric signal;
the second connection end of the first voltage source circuit is used for the second preset voltage signal V 1 Is input to the computer;
the third connection end of the first voltage source circuit is connected with the gain switching circuit and is used for outputting the second preset voltage signal V 1 ；
The first switch circuit S 1 Is connected with a third connecting end of the first voltage source circuit, and the other end is grounded; the first switch circuit S 1 For when said first monitor voltage signal V DS Is greater than the first preset voltage signal V th When the second preset voltage signal V is generated 1 Outputting a second preset voltage signal V to the gain switching circuit through a third connection end of the first voltage source circuit 1 ；
The first capacitor C 1 Is connected to the third connection terminal of the first voltage source circuit, and the other terminal is grounded.
4. The synchronous rectification control circuit of claim 1, wherein said gain switching circuit comprises a first connection, a second connection, a third connection, a first voltage multiplier, a second switching circuit S 2 Third switch circuit S 3 And a second capacitor C 2 ；
The first connection end of the gain switching circuit is connected with the first voltage source circuit and is used for the second preset voltage signal V 1 Is input to the computer;
the second connecting end and the third connecting end of the gain switching circuit are respectively connected with the turn-off time setting circuit;
the second switch circuit S 2 One end of the first voltage multiplier is connected with the first connecting end of the gain switching circuit, and the other end of the first voltage multiplier is connected with the positive input end of the first voltage multiplier;
the negative input end of the first voltage multiplier is grounded, the output end of the first voltage multiplier is connected with the second connecting end of the gain switching circuit, and the gain multiple value of the first voltage multiplier is a preset constant A;
the third switch circuit S 3 One end of the gain switching circuit is connected with the second connecting end of the gain switching circuit, and the other end of the gain switching circuit is connected with the third connecting end of the gain switching circuit;
the second capacitor C 2 Is connected with the third connecting end of the gain switching circuit, and the other end is grounded.
5. The synchronous rectification control circuit of claim 4, wherein said gain switching circuit further comprises a third capacitor C 3 And a fourth capacitor C 4 ；
The third capacitor C 3 One end of the first voltage multiplier is connected with the positive input end of the first voltage multiplier, and the other end of the first voltage multiplier is grounded;
the fourth capacitor C 4 One end of the first voltage multiplier is connected with the output end of the first voltage multiplier, and the other end of the first voltage multiplier is grounded.
6. The synchronous rectification control circuit of claim 4, wherein said off-time setting circuit comprises a first connection, a second connection, and a second comparator U2;
the first connecting end of the turn-off time setting circuit is connected with the second connecting end of the gain switching circuit, and the second connecting end of the turn-off time setting circuit is connected with the third connecting end of the gain switching circuit;
the positive input end of the second comparator U2 is connected with the first connection end of the turn-off time setting circuit, and the negative input end of the second comparator U2 is connected with the second connection end of the turn-off time setting circuit.
7. The synchronous rectification control circuit as claimed in claim 1, wherein the number of said off-mask setting units is the same as the number of said rectification MOS transistors, and each off-mask setting unit sets an off-mask time of one of said rectification MOS transistors.
8. A synchronous rectification control method for suppressing false turn-on of a rectifier tube, characterized by being applied to the synchronous rectification control circuit according to any one of claims 1 to 7, comprising:
monitoring a voltage signal between the drain electrode and the source electrode of the rectifying MOS tube to obtain a first monitoring voltage signal V DS ；
Acquiring a first monitoring voltage signal V DS And a preset first preset voltage signal V th Comparing; when the first monitoring voltage signal V DS Is greater than the first preset voltage signal V th When the voltage is higher than a predetermined voltage, the voltage is higher than the predetermined voltage 1 Gain A times to obtain a first gain voltage signal V A The gain multiple A is a preset constant;
for the first gain voltage signal V A And the second preset voltage signal V 1 Comparing and according to the first gain voltage signal V A And the second preset voltage signal V 1 And (3) adjusting the turn-off shielding time of the rectifying MOS tube.
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