CN114094846A - Synchronous rectification control circuit for realizing high-stability parallel application - Google Patents
Synchronous rectification control circuit for realizing high-stability parallel application Download PDFInfo
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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
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
- H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
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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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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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
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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
- H02M1/36—Means for starting or stopping converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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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Abstract
The invention relates to the technical field of synchronous rectification of switching power supplies, in particular to a synchronous rectification control circuit for realizing high-stability parallel application, which comprises an opening detection unit, a closing detection unit, a parallel opening detection unit, a parallel closing detection unit and an output control unit.
Description
Technical Field
The invention relates to the technical field of synchronous rectification of switching power supplies, in particular to a synchronous rectification control circuit for realizing high-stability parallel application.
Background
With the development of the current switching power supply technology, the applied output current is larger and larger, and the requirements on the temperature and the efficiency of a system are higher and higher, in order to improve the efficiency, two demagnetization loop improvement modes are generally adopted, wherein one demagnetization loop improvement mode adopts a plurality of Schottky loops in parallel connection, and the other demagnetization loop improvement mode adopts a synchronous rectification circuit with smaller conduction internal resistance.
When the system needs to output more than 10A of current, a plurality of Schottky devices are used in parallel, however, inherent conduction voltage drop exists in the Schottky devices, the conduction loss is larger when the current is larger, the loss reaches 4W when the current is output by 10A, and the loss reaches 8W when the current is output by 20A; when the small current is less than 5A, a single synchronous rectification circuit can be used for replacing Schottky, and when the large current works, if the system works at 10A, the peak current can reach more than 40A, the conduction internal resistance of the synchronous rectification power tube is 10m omega, the conduction voltage drop is 400mV, and the conduction voltage drop is close to that of the parallel Schottky application, so that the significance of adopting synchronous rectification is lost.
The existing synchronous rectification circuit can not bear the current which is so large, and the forced parallel connection can cause that the instantaneous current impacts on a single synchronous rectification circuit to cause burning out due to the fact that the synchronous rectification circuit can not be simultaneously opened and closed.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the synchronous rectification control circuit for realizing high-stability parallel application accurately achieves synchronous opening and synchronous closing of a plurality of synchronous rectification circuits, and realizes high-reliability parallel application in the process of super-large current output.
In order to solve the technical problems, the invention adopts the technical scheme that:
a synchronous rectification control circuit for realizing high-stability parallel application comprises a primary side controller, a transformer, and a capacitor C1And a resistance R1The power supply also comprises more than two synchronous rectification circuits which are connected in parallel, wherein each synchronous rectification circuit comprises a power tube N1And a main control unit, a DRV port of the main control unit and the power tube N1The grid of the grid is electrically connected; the input end of the main control unit and the power tube N1Is electrically connected with the drain electrode; the S end of the main control unit is the power tube N1Is electrically connected with the source electrode;
the main control unit comprises an opening detection unit, a closing detection unit, a parallel opening detection unit, a parallel closing detection unit and an output control unit, wherein the opening detection unit comprises an opening control unit, a reference power supply and a field effect tube SW1Electricity, electricityResistance R2And a resistance R3Said resistance R2Is electrically connected to the reference power supply, the resistor R2Is respectively connected with the output end of the opening detection unit and the resistor R3Is electrically connected to one end of the resistor R3And the other end of the same and the field effect transistor SW1Is electrically connected to the drain electrode of the field effect transistor SW1The source of (1) is grounded, the field effect transistor SW1The grid of the power supply unit is electrically connected with one end of the starting control unit, and the other end of the starting control unit is electrically connected with the input end of the main control unit;
resistance R1And a resistance R2The resistance values are the same;
the output ends of more than two starting detection units are connected in parallel;
the turn-off detection unit comprises a turn-off control unit, a reference power supply and a field effect tube SW2And a resistance R4Said resistance R4Is electrically connected to the reference power supply, the resistor R4Is respectively connected with the output end of the closing detection unit and the field effect tube SW2Is electrically connected to the drain electrode of the field effect transistor SW2The source of (1) is grounded, the field effect transistor SW2The grid of the switching-off control unit is electrically connected with one end of the switching-off control unit, and the other end of the switching-off control unit is electrically connected with the input end of the main control unit;
the output ends of more than two closing detection units are connected in parallel;
the input end of the parallel opening detection unit is electrically connected with the output end of the opening detection unit, the input end of the parallel closing detection unit is electrically connected with the output end of the closing detection unit, the output end of the parallel opening detection unit and the output end of the parallel closing detection unit are respectively electrically connected with the input end of the output control unit, and the output end of the output control unit is electrically connected with the DRV port of the main control unit.
Further, the output end of the primary side controller is electrically connected with the primary side winding of the transformer, and the secondary side winding of the transformerOne end of the transformer is electrically connected with the input end of the synchronous rectification circuit, and the other end of the secondary winding of the transformer is connected with the resistor R1Is electrically connected to one end of the resistor R1The other end of the capacitor C is electrically connected with the output end of the synchronous rectification circuit1And the resistance R1Are connected in parallel.
Furthermore, the start control unit comprises a negative level fast comparator, the positive input end of the negative level fast comparator is externally connected with a reference voltage, the negative input end of the negative level fast comparator is electrically connected with the input end of the main control unit, and the output end of the negative level fast comparator is connected with the field effect transistor SW1Is electrically connected.
Further, the turn-off control unit comprises a low offset mV comparator, a positive input end of the low offset mV comparator is electrically connected with an input end of the main control unit, a negative input end of the low offset mV comparator is externally connected with a reference voltage, and an output end of the low offset mV comparator is connected with the field effect transistor SW2Is electrically connected.
Furthermore, the parallel connection start detection unit includes a first comparator, a positive input end of the first comparator is electrically connected to an output end of the start detection unit, a negative input end of the first comparator is externally connected to a reference voltage, and an output end of the first comparator is electrically connected to an input end of the output control unit.
Further, the parallel connection closing detection unit includes a second comparator, a positive input end of the second comparator is electrically connected to an output end of the closing detection unit, a negative input end of the second comparator is externally connected to a reference voltage, and an output end of the second comparator is electrically connected to an input end of the output control unit.
Further, the field effect transistor SW1Is of the type of an enhanced NMOS transistor, a field effect transistor SW2Is an enhanced NMOS tube, and the reference power supply is 2. V1。
Further, the power tube N1The high-voltage NMOS transistor has the on-resistance ranging from 5 to 20m omega.
The invention has the beneficial effects that:
the invention provides a synchronous rectification control circuit for realizing high-stability parallel application, which comprises an opening detection unit, a closing detection unit, a parallel opening detection unit, a parallel closing detection unit and an output control unit, wherein opening control signals of all parallel synchronous rectification circuits are detected by utilizing parallel-connected ports A, closing control signals of all parallel synchronous rectification circuits are detected by utilizing parallel-connected ports B, and the output control unit is controlled to provide corresponding driving level and driving current for a power tube, so that synchronous opening and synchronous closing of the circuit are accurately realized, and high-reliability parallel application during super-large current output is realized.
Drawings
FIG. 1 is a schematic diagram of a synchronous rectification control circuit for implementing high stability parallel application according to the present invention;
FIG. 2 is a schematic diagram of a synchronous rectification circuit unit of a synchronous rectification control circuit for realizing high-stability parallel application according to the present invention;
fig. 3 is a schematic structural diagram of a main control unit of a synchronous rectification control circuit for realizing high-stability parallel application according to the present invention;
fig. 4 is a schematic structural diagram of a start detection unit of a synchronous rectification control circuit for realizing high-stability parallel application according to the present invention;
FIG. 5 is a schematic structural diagram of a turn-off detection unit of a synchronous rectification control circuit for realizing high-stability parallel application according to the present invention;
FIG. 6 is a schematic diagram of a start control unit of a synchronous rectification control circuit for realizing high-stability parallel application according to the present invention;
FIG. 7 is a schematic diagram of a shutdown control unit of a synchronous rectification control circuit for high stability parallel application according to the present invention;
FIG. 8 is a schematic diagram of a parallel start detection unit of a synchronous rectification control circuit for high stability parallel application according to the present invention;
FIG. 9 is a schematic diagram of a parallel shutdown detection unit of a synchronous rectification control circuit for high stability parallel application according to the present invention;
description of the reference symbols:
SW: a main control unit input end;
s: an output end of the main control unit;
a: starting an output end of the detection unit;
b: closing the output end of the detection unit;
CP1: a negative level fast comparator;
CP2: a low offset mV comparator;
CP3: a first comparator;
CP4: a second comparator.
Detailed Description
In order to explain the technical contents, the objects and the effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Referring to fig. 1 to 9, a synchronous rectification control circuit for realizing high-stability parallel application includes a primary side controller, a transformer, a capacitor C1And a resistance R1The power supply also comprises more than two synchronous rectification circuits which are connected in parallel, wherein each synchronous rectification circuit comprises a power tube N1And a main control unit, a DRV port of the main control unit and the power tube N1The grid of the grid is electrically connected; the input end of the main control unit and the power tube N1Is electrically connected with the drain electrode; the S end of the main control unit is the power tube N1Is electrically connected with the source electrode;
the main control unit comprises an opening detection unit, a closing detection unit, a parallel opening detection unit, a parallel closing detection unit and an output control unit, wherein the opening detection unit comprises an opening control unit, a reference power supply and a field effect tube SW1Resistance R2And a resistance R3Said resistance R2Is electrically connected to the reference power supply, the resistor R2Is respectively connected with the output end of the opening detection unit and the resistor R3Is electrically connected to one end of the resistor R3Is electrically connected with the drain electrode of the field effect tube SW1, the field effect tube SW1The source of (1) is grounded, the field effect transistor SW1The grid of the power supply unit is electrically connected with one end of the starting control unit, and the other end of the starting control unit is electrically connected with the input end of the main control unit;
resistance R1And a resistance R2The resistance values are the same;
the output ends of more than two starting detection units are connected in parallel;
the turn-off detection unit comprises a turn-off control unit, a reference power supply and a field effect transistor SW2And a resistance R4Said resistance R4Is electrically connected to the reference power supply, the resistor R4Is respectively connected with the output end of the closing detection unit and the field effect tube SW2Is electrically connected to the drain of the field effect transistor SW2The source of (1) is grounded, the field effect transistor SW2The grid of the switching-off control unit is electrically connected with one end of the switching-off control unit, and the other end of the switching-off control unit is electrically connected with the input end of the main control unit;
the output ends of more than two closing detection units are connected in parallel;
the input end of the parallel opening detection unit is electrically connected with the output end of the opening detection unit, the input end of the parallel closing detection unit is electrically connected with the output end of the closing detection unit, the output end of the parallel opening detection unit and the output end of the parallel closing detection unit are respectively electrically connected with the input end of the output control unit, and the output end of the output control unit is electrically connected with the DRV port of the main control unit.
From the above description, the beneficial effects of the present invention are: the invention provides a synchronous rectification control circuit for realizing high-stability parallel application, which comprises an opening detection unit, a closing detection unit, a parallel opening detection unit, a parallel closing detection unit and an output control unit, wherein opening control signals of all parallel synchronous rectification circuits are detected by utilizing parallel-connected ports A, closing control signals of all parallel synchronous rectification circuits are detected by utilizing parallel-connected ports B, and the output control unit is controlled to provide corresponding driving level and driving current for a power tube, so that synchronous opening and synchronous closing of the circuit are accurately realized, and high-reliability parallel application during super-large current output is realized.
Further, the output end of the primary side controller is electrically connected with the primary side winding of the transformer, one end of the secondary side winding of the transformer is electrically connected with the input end of the synchronous rectification circuit, and the other end of the secondary side winding of the transformer is electrically connected with the resistor R1Is electrically connected to one end of the resistor R1The other end of the capacitor C is electrically connected with the output end of the synchronous rectification circuit1And the resistance R1Are connected in parallel.
As can be seen from the above description, the initial signal is sent for the subsequent partial circuit by this circuit.
Furthermore, the starting control unit comprises a negative level rapid comparator, the positive input end of the negative level rapid comparator is externally connected with a reference voltage, the negative input end of the negative level rapid comparator is electrically connected with the input end of the main control unit, and the output end of the negative level rapid comparator is connected with the field effect transistor SW1Is electrically connected.
As can be seen from the above description, whether the start signal is sent is determined by the start control unit.
Further, the turn-off control unit comprises a low offset mV comparator, a positive input end of the low offset mV comparator is electrically connected with an input end of the main control unit, a negative input end of the low offset mV comparator is externally connected with a reference voltage, and an output end of the low offset mV comparator is connected with the field effect transistor SW2Is electrically connected.
As can be seen from the above description, whether the shutdown signal is issued is determined by the shutdown control unit.
Furthermore, the parallel connection start detection unit includes a first comparator, a positive input end of the first comparator is electrically connected to an output end of the start detection unit, a negative input end of the first comparator is externally connected to a reference voltage, and an output end of the first comparator is electrically connected to an input end of the output control unit.
As can be seen from the above description, the parallel on signal is detected by the parallel on detecting unit.
Furthermore, the parallel connection closing detection unit includes a second comparator, a positive input end of the second comparator is electrically connected to an output end of the closing detection unit, a negative input end of the second comparator is externally connected to a reference voltage, and an output end of the second comparator is electrically connected to an input end of the output control unit.
As can be seen from the above description, the parallel shutdown signal is detected by the parallel shutdown detection unit.
Further, the field effect transistor SW1Is of the type of an enhanced NMOS transistor, a field effect transistor SW2Is an enhanced NMOS tube, and the reference power supply is 2. V1。
Further, the power tube N1The high-voltage NMOS transistor has the on-resistance ranging from 5 to 20m omega.
Referring to fig. 1 to 9, a first embodiment of the present invention is:
the invention provides a synchronous rectification control circuit for realizing high-stability parallel application, which comprises a primary side controller, a transformer L and a capacitor C1And a resistance R1The device also comprises more than two synchronous rectification circuits which are mutually connected in parallel;
in this embodiment, the reference power supply is 2 · V1；
In this embodiment, as shown in fig. 1, the output terminal of the primary side controller and the primary winding L of the transformerpElectrical connection, secondary winding L of said transformersIs electrically connected with the input end of the synchronous rectification circuit, and a secondary winding L of the transformersAnd the other end of (2) and the resistor R1Is electrically connected to one end of the resistor R1The other end of the capacitor C is electrically connected with the output end of the synchronous rectification circuit1And the resistance R1Are connected in parallel;
in the present embodiment, as shown in fig. 2, the synchronous rectification circuit includes a power tube N1And a main control unit, a DRV port of the main control unit and the power tube N1The grid G of the grid is electrically connected; the input end SW of the main control unit and the power tube N1Is electrically connected with the drain electrode D; the output end S of the main control unit and the power tube N1Is electrically connected with the source S;
in this embodiment, as shown in fig. 3, the main control unit includes an on detection unit, an off detection unit, a parallel on detection unit, a parallel off detection unit, and an output control unit;
in the present embodiment, as shown in fig. 8 to 9, the parallel turn-on detecting unit includes a first comparator CP3The parallel shutdown detection unit includes a second comparator CP4；
The first comparator CP3Is electrically connected with the output terminal a of the start detection unit, and the second comparator CP4Is electrically connected to the output B of the turn-off detection unit, the first comparator CP3And the second comparator CP4The output end of the output control unit is electrically connected with the input end of the output control unit, the output end of the output control unit is electrically connected with the DRV port of the main control unit, and the output end of the output control unit is electrically connected with the output end S of the main control unit;
in the present embodiment, as shown in fig. 8 to 9, the first comparator CP3Negative input end of the voltage regulator is externally connected with a reference voltage V1Said second comparator CP4The negative input end of the voltage regulator is externally connected with a reference voltage D, the reference voltage D is less than 100mV, and when the voltage of the A end is lower than V1While, the first comparator CP3Outputting low level when the voltage at B is lower than V1While, the second comparator CP4Outputting a low level;
first comparator CP3And a second comparator CP4The structure of the comparator can be a comparator formed by an MOS tube, a comparator formed by a triode, or a comparator formed by mixing the MOS tube and the triode, and the comparator mainly completes the comparison function;
in this embodiment, as shown in fig. 4, the turn-on detection unit includes a turn-on control unit, a reference power supply 2 · V1And field effect transistor SW1Resistance R2And a resistance R3；
In the present embodiment, as shown in fig. 6, the turn-on control unit includes a negative-level fast comparator CP1；
The resistor R2And one end of (2) with the reference power supply1Electrical connection, the resistance R2Is respectively connected with the output end A of the opening detection unit and the resistor R3Is electrically connected to one end of the resistor R3And the other end of the same and the field effect transistor SW1Is electrically connected to the drain electrode of the field effect transistor SW1The input terminal SW of the main control unit and the negative level fast comparator CP1Is electrically connected to the negative input terminal of the field effect transistor SW1Gate of and negative level fast comparator CP1The output ends of the two-way valve are electrically connected;
resistance R1And a resistance R2The resistance values are the same;
the output ends A of more than two starting detection units are connected in parallel;
in the present embodiment, as shown in fig. 6, the negative level fast comparator CP1The positive input terminal of the low-voltage direct current converter is externally connected with a reference voltage of-300 Mv, and when the SW voltage is lower than-300 Mv, the negative level fast comparator CP1Turning over and outputting a high level;
negative level fast comparator CP1The structure of the comparator can be a comparator formed by an MOS tube, a comparator formed by a triode, or a comparator formed by mixing the MOS tube and the triode, and the comparator mainly completes the comparison function;
in the present embodiment, as shown in fig. 5, the off detection unit includes an off control unit, a reference power supply 2 · V1And field effect transistor SW2And a resistance R2；
In the present embodiment, as shown in fig. 7, the shutdown control unit includes a low offset mV comparator CP2；
The resistance R4And one end of (2) with the reference power supply1Electrical connection, the resistance R4And the other end of the first switch is respectively connected with the output end B of the closing detection unitAnd the field effect transistor SW2Is electrically connected to the drain electrode of the field effect transistor SW2The source of (1) is grounded, the field effect transistor SW2Grid of and low offset mV comparator CP2Is electrically connected with the output terminal of the low-offset mV comparator CP2The positive input end of the main control unit is electrically connected with the input end SW of the main control unit;
the output ends B of more than two closing detection units are connected in parallel;
in this embodiment, the low offset mV comparator CP is shown in fig. 72Has a negative input end connected with an external reference voltage kmV, k ranges from 1 to 4, and when the SW voltage is higher than kmV, the low offset mV comparator CP2Turning over and outputting a high level;
low-offset mV comparator CP2The structure of the comparator can be a comparator formed by an MOS tube, a comparator formed by a triode, or a comparator formed by mixing the MOS tube and the triode, and the comparator mainly completes the comparison function;
in the present embodiment, the field effect transistor SW1Is of the type of NMOS tube or field effect tube SW2Is an NMOS tube, and the power tube N1Is an NMOS tube, the range of the on-resistance is 5-20m omega, and the resistance R is1Is 5K omega, the resistance R2Has a resistance value of 100K omega and a resistance R3Has a resistance value of 100K omega and a resistance R4Has a resistance of 100K omega and a capacitance C1Has a capacity value of 1 mF;
resistance R1The resistance value of (2) is not limited to 5K omega, and the range is 500-10K omega;
resistance R2、R3Is not limited to 100K omega, satisfies R2＝R3Condition (R) is4The resistance of (2) is not limited to 100 K.OMEGA.and ranges from 10K to 1 M.OMEGA..
The working principle is as follows: the parallel connection opening detection unit detects opening control signals of all parallel connection synchronous rectification circuits through the voltage of the port A, and when all the synchronous rectification circuits do not send out opening signals, the voltage of the port A of the parallel connection is 2V1When all the synchronous rectification circuits send out opening signals, the voltage of the parallel port A is V1When there is partial synchronizationWhen the rectifying circuit does not send out a synchronous rectifying start signal, the voltage of the parallel port A is at V1To 2. V1Meanwhile, all the synchronous rectification circuits are not started, and only the voltage of the parallel port A is V1When the synchronous rectification circuits are connected in parallel, the synchronous rectification circuits send out starting signals, the starting signals are locked at the moment, the locking time is 1-2us, all the parallel synchronous rectification circuits are started, and the power tubes N of the synchronous rectification circuits are started in the locking time through the output control unit1The safe opening of all parallel synchronization is ensured, and after the locking period is over, a closing signal is detected through the port B;
the parallel connection closing detection unit detects closing control signals of all parallel connection synchronous rectification circuits through the port B, and when all the synchronous rectification circuits do not send out closing signals, the voltage of the parallel connection port A is 2V1When one parallel synchronous rectification circuit sends out a closing signal, the closing signal is locked at the moment, the locking time is 0.4-1us, the parallel port B is immediately pulled down to 0V, a control signal for closing all the parallel synchronous rectification circuits is sent out at the moment, and all the parallel synchronous rectification circuits are closed. Closing the power tube N of the output control unit in the locking time1The synchronous rectification circuit ensures that all the parallel synchronous rectification circuits are synchronously locked to close signals immediately as long as one synchronous sending close signal exists, and ensures that all the synchronizations are closed simultaneously. After the locking period, the synchronous rectification circuit detects an opening signal through the port A;
the output control unit provides corresponding driving level and driving current for the power tube, and the opening and closing speed is guaranteed to be controlled within 5 ns.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.
Claims (8)
1. A synchronous rectification control circuit for realizing high-stability parallel application comprises a primary side controller, a transformer, and a capacitor C1And a resistance R1The power supply circuit is characterized by further comprising more than two synchronous rectification circuits which are connected in parallel, wherein each synchronous rectification circuit comprises a power tube N1And a main control unit, a DRV port of the main control unit and the power tube N1The grid of the grid is electrically connected; the input end of the main control unit and the power tube N1Is electrically connected with the drain electrode; the S end of the main control unit is the power tube N1Is electrically connected with the source electrode;
the main control unit comprises an opening detection unit, a closing detection unit, a parallel opening detection unit, a parallel closing detection unit and an output control unit, wherein the opening detection unit comprises an opening control unit, a reference power supply and a field effect transistor SW1Resistance R2And a resistance R3Said resistance R2Is electrically connected to the reference power supply, the resistor R2Is respectively connected with the output end of the opening detection unit and the resistor R3Is electrically connected to one end of the resistor R3And the other end of the same and the field effect transistor SW1Is electrically connected to the drain electrode of the field effect transistor SW1The source of (1) is grounded, the field effect transistor SW1The grid of the power supply unit is electrically connected with one end of the starting control unit, and the other end of the starting control unit is electrically connected with the input end of the main control unit;
resistance R2And a resistance R3The resistance values are the same;
the output ends of more than two starting detection units are connected in parallel;
the turn-off detection unit comprises a turn-off control unit, a reference power supply and a field effect tube SW2And a resistance R4Said resistance R4Is electrically connected to the reference power supply, the resistor R4Is respectively connected with the output end of the closing detection unit and the field effect tube SW2Is electrically connected to the drain electrode of the field effect transistor SW2The source of (1) is grounded, the field effect transistor SW2The grid of the switch is electrically connected with one end of the closing control unit, and the other end of the closing control unit is electrically connected with the input end of the main control unit;
the output ends of more than two closing detection units are connected in parallel;
the input end of the parallel opening detection unit is electrically connected with the output end of the opening detection unit, the input end of the parallel closing detection unit is electrically connected with the output end of the closing detection unit, the output end of the parallel opening detection unit and the output end of the parallel closing detection unit are respectively electrically connected with the input end of the output control unit, and the output end of the output control unit is electrically connected with the DRV port of the main control unit.
2. The synchronous rectification control circuit with high stability for parallel application as claimed in claim 1, wherein the output terminal of the primary controller is electrically connected to the primary winding of the transformer, one end of the secondary winding of the transformer is electrically connected to the input terminal of the synchronous rectification circuit, and the other end of the secondary winding of the transformer is electrically connected to the resistor R1Is electrically connected to one end of the resistor R1The other end of the capacitor C is electrically connected with the output end of the synchronous rectification circuit1And the resistance R1Are connected in parallel.
3. The synchronous rectification control circuit for realizing high-stability parallel application of claim 1, wherein the turn-on control unit comprises a negative-level fast comparator, a positive input end of the negative-level fast comparator is externally connected with a reference voltage, a negative input end of the negative-level fast comparator is electrically connected with an input end of the main control unit, and an output end of the negative-level fast comparator is connected with a field effect transistor SW1Is electrically connected.
4. The synchronous rectification control circuit for realizing high-stability parallel application of claim 1, wherein the turn-off control unit comprises a low offset mV comparator, a positive input terminal of the low offset mV comparator is electrically connected with an input terminal of the main control unit, a negative input terminal of the low offset mV comparator is externally connected with a reference voltage, and the low offset mV comparator is characterized in that the low offset mV comparator is connected with a reference voltageOutput end of mV adjusting comparator and field effect tube SW2Is electrically connected.
5. The synchronous rectification control circuit for realizing high-stability parallel application as claimed in claim 1, wherein said parallel start detection unit comprises a first comparator, a positive input terminal of said first comparator is electrically connected to an output terminal of the start detection unit, a negative input terminal of said first comparator is externally connected to a reference voltage, and an output terminal of said first comparator is electrically connected to an input terminal of the output control unit.
6. The synchronous rectification control circuit for realizing high-stability parallel application of claim 1, wherein the parallel shutdown detection unit comprises a second comparator, a positive input terminal of the second comparator is electrically connected to the output terminal of the shutdown detection unit, a negative input terminal of the second comparator is externally connected to a reference voltage, and an output terminal of the second comparator is electrically connected to the input terminal of the output control unit.
7. The synchronous rectification control circuit for realizing high-stability parallel application of claim 1, wherein the field effect transistor SW1Is of the type of an enhanced NMOS transistor, a field effect transistor SW2Is an enhanced NMOS tube, and the reference power supply is 2. V1。
8. The synchronous rectification control circuit for realizing high-stability parallel application of claim 1, wherein the power tube N is connected in parallel1The high-voltage NMOS transistor has the on-resistance ranging from 5 to 20m omega.
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