CN108183617B - Synchronous rectification control method and control device - Google Patents
Synchronous rectification control method and control device Download PDFInfo
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- CN108183617B CN108183617B CN201810116515.6A CN201810116515A CN108183617B CN 108183617 B CN108183617 B CN 108183617B CN 201810116515 A CN201810116515 A CN 201810116515A CN 108183617 B CN108183617 B CN 108183617B
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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
- H02M1/0009—Devices or circuits for detecting current in a converter
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
- Dc-Dc Converters (AREA)
Abstract
A synchronous rectification control method and a synchronous rectification control device solve the technical problem that the existing rectification method cannot be suitable for an electric energy conversion device with low-voltage and large-current output. The method comprises the steps of collecting current intensity signals output by a switching power supply in real time; forming a first rectification driving signal when the current intensity signal reaches a threshold value; collecting a voltage drop signal between a source electrode and a drain electrode of a synchronous rectification field effect transistor in a switching power supply; forming a second rectified drive signal according to the voltage drop signal; and forming an enabling signal of the grid electrode of the synchronous rectification field effect transistor according to the first rectification driving signal and the second rectification driving signal. The synchronous rectification control circuit can be automatically controlled according to the output current, has a digital control function and is reliable in performance. The circuit can meet the synchronous rectification control function of the switching power supply through the result display of various performance tests, and has the advantages of simple control mode, easy adjustment of control range, high reliability and capability of meeting the actual requirement.
Description
Technical Field
The present invention relates to a control method and a control device for a switching power supply system, and more particularly, to a synchronous rectification control method and a control device.
Background
A DC voltage-stabilizing switch power supply system is an electric energy conversion device for converting three-phase, single-phase and DC high-voltage electricity into low-voltage large-current output. Because the current output by the power supply is large, the power supply needs to adopt a synchronous rectification technology to reduce loss. The conventional diode rectification means is adopted to drive and control the power supply simply, but the loss generated by obvious voltage drop is overlarge, so that the efficiency of the power supply is reduced, the heat dissipation of the power supply is not facilitated, and the reliability of the power supply is seriously influenced.
Disclosure of Invention
The invention aims to provide a synchronous rectification control method and a synchronous rectification control device, which solve the technical problem that the existing rectification method cannot be suitable for an electric energy conversion device with low-voltage and large-current output.
The synchronous rectification control method comprises the following steps:
collecting current intensity signals output by a switching power supply in real time;
forming a first rectification driving signal when the current intensity signal reaches a threshold value;
collecting a voltage drop signal between a source electrode and a drain electrode of a synchronous rectification field effect transistor in a switching power supply;
forming a second rectified drive signal according to the voltage drop signal;
and forming an enabling signal of the grid electrode of the synchronous rectification field effect transistor according to the first rectification driving signal and the second rectification driving signal.
The real-time acquisition can be realized by using a current transformer or a voltage transformer as an acquisition device and acquiring a current intensity signal in real time through signal conversion.
And the judgment of the current intensity signal is completed by a logic processing chip with a signal input and output port.
The second rectifying driving signal can be formed by adopting a corresponding integrated operational amplifier circuit chip, and the input voltage drop signal is formed into a second rectifying driving signal to be output according to the setting parameters of the integrated operational amplifier circuit chip.
The enabling signal is formed by an AND gate integrated circuit unit or by combining and combining output signal lines.
The synchronous rectification control device of the invention comprises:
and the current sampling circuit is used for acquiring the current intensity signal output by the switching power supply in real time.
And the singlechip is used for forming a first rectification driving signal when judging that the current intensity signal reaches a threshold value.
And the synchronous filter is used for acquiring a voltage drop signal between the source and the drain of the synchronous rectification field-effect transistor 41 in the switching power supply 40 and forming a second rectification driving signal.
And the signal combiner is used for combining the first rectification driving signal and the second rectification driving signal to form an enabling signal of the grid electrode of the synchronous rectification field effect transistor.
The synchronous filter A04 adopts 11682 series intelligent filter chips.
The high-power synchronous rectification circuit comprises a first synchronous rectification field-effect tube A01, a second synchronous rectification field-effect tube A02, a synchronous filter A04 and a high-power driver circuit A03, wherein the high-power driver circuit A03 adopts a UCC27324 series high-peak driver chip, the source of the first synchronous rectification field-effect tube A01 is connected with the pin S2 of the synchronous filter A04, the drain of the first synchronous rectification field-effect tube A01 is connected with the pin D2 of the synchronous filter A04 through a diode D01 and a resistor R05 which are connected in parallel, the source of the second synchronous rectification field-effect tube A02 is connected with the pin S1 of the synchronous filter A04, the drain of the second synchronous rectification field-effect tube A02 is connected with the pin D1 of the synchronous filter A04 through a diode D02 and a resistor R06 which are connected in parallel, a resistor R01 is connected between the gate and the source of the first synchronous rectification field-effect tube A01, and the high-power driver circuit A01 is connected with the pin OU, a resistor R02 is connected between the grid and the source of a second synchronous rectification field-effect tube A02, the grid of the second synchronous rectification field-effect tube A02 is connected with the OUTB pin of a high-power driver circuit A03 after being connected with a resistor R01 in series, the source of a first synchronous rectification field-effect tube A01 is connected with the source of a second synchronous rectification field-effect tube A02, a capacitor C02 is connected between the pin D1 and the pin S1 of a synchronous filter A04, a capacitor C01 is connected between the pin D2 and the pin S2 of a synchronous filter A04, and the drain of the first synchronous rectification field-effect tube A01 and the drain of the second synchronous rectification field-effect tube A02 are respectively connected with the secondary winding of a transformer T01; the first output port of the single chip microcomputer is connected with an INB pin of a high-power driver circuit A03 after being connected with a resistor R09 and an inductor L01 in series, one end of a resistor R12 is connected with a G1 pin of a synchronous filter A04, the other end of the resistor R12 is connected on a line between the inductor L01 and the INB pin of the high-power driver circuit A03, a second output port of the single chip microcomputer is connected with an INA pin of a high-power driver circuit A03 after being connected with a resistor R10 and an inductor L02 in series, one end of a resistor R11 is connected with a G2 pin of the synchronous filter A04, and the other end of the resistor R11 is connected on.
The synchronous rectification control method of the invention utilizes the voltage drop between two ends of the induction synchronous rectification field effect transistor D, S and simultaneously utilizes the output current of the sampling power supply to jointly determine the sending of the synchronous rectification driving signal. The synchronous rectification control circuit can be automatically controlled according to the output current, has a digital control function and is reliable in performance. The circuit can meet the synchronous rectification control function of the switching power supply through the result display of various performance tests, and has the advantages of simple control mode, easy adjustment of control range, high reliability and capability of meeting the actual requirement.
The invention will be further explained with reference to the drawings.
Drawings
Fig. 1 is a flowchart of a synchronous rectification control method according to the present invention.
Fig. 2 is a schematic structural diagram of the synchronous rectification control device of the present invention.
Fig. 3 is a schematic circuit connection diagram of the synchronous rectification control device of the present invention.
Detailed Description
As shown in fig. 1, the synchronous rectification control method of the present invention includes:
step 50: and acquiring a current intensity signal output by the switching power supply in real time.
The current transformer or the voltage transformer can be used as a collecting device for real-time collection, and the current intensity signal can be obtained in real time through signal conversion.
Step 60: and forming a first rectification driving signal when the current intensity signal is judged to reach the threshold value.
The judgment of the current intensity signal can be completed by a logic processing chip with a signal input/output port, such as a PLC singlechip, an MCU main control unit and the like. The logic processing chip sets a judgment threshold value and forms a first rectification driving signal according to the built-in judgment logic.
Step 70: and collecting voltage drop signals between a source electrode and a drain electrode of a synchronous rectification field effect transistor in the switching power supply.
The voltage drop signal between the source and the drain can be collected by a corresponding integrated operational amplifier circuit chip. The integrated operational amplifier circuit chip outputs the conditioned signal for subsequent signal comparison.
Step 80: a second rectified drive signal is formed from the voltage drop signal.
And forming the second rectifying drive signal can be completed by adopting a corresponding integrated operational amplifier circuit chip, and forming the input voltage drop signal into a second rectifying drive signal for output according to the setting parameters of the integrated operational amplifier circuit chip.
Step 90: and forming an enabling signal of the grid electrode of the synchronous rectification field effect transistor according to the first rectification driving signal and the second rectification driving signal.
The first and second rectification driving signals can form an enabling signal through an AND gate integrated circuit unit, and can also form an enabling signal through the AND operation of signal intensity formed by combining and doubling two paths of output signal lines, and the enabling signal is used for controlling signals of a subsequent controlled circuit.
The synchronous rectification control method of the invention utilizes the voltage drop between two ends of the induction synchronous rectification field effect transistor D, S and simultaneously utilizes the output current of the sampling power supply to jointly determine the sending of the synchronous rectification driving signal. The synchronous rectification control circuit can be automatically controlled according to the output current, has a digital control function and is reliable in performance. The circuit can meet the synchronous rectification control function of the switching power supply through the result display of various performance tests, and has the advantages of simple control mode, easy adjustment of control range, high reliability and capability of meeting the actual requirement.
As shown in fig. 2, the synchronous rectification control apparatus of the present invention includes:
and the current sampling circuit 10 is used for acquiring a current intensity signal output by the switching power supply in real time.
And the singlechip 20 is used for forming a first rectification driving signal when the current intensity signal reaches the threshold value.
And the synchronous filter 30 is used for acquiring a voltage drop signal between the source and the drain of the synchronous rectification field-effect transistor 41 in the switching power supply 40 and forming a second rectification driving signal.
And the signal combiner 35 is configured to combine the first rectification driving signal and the second rectification driving signal to form an enable signal of the gate of the synchronous rectification field-effect transistor.
As shown in fig. 3, an embodiment of the synchronous rectification control device of the present invention includes a first synchronous rectification fet a01, a second synchronous rectification fet a02, a synchronous filter a04 and a high power driver circuit a03, where the synchronous filter a04 adopts a 11682 series smart filter chip (e.g., an IR11682S chip), the high power driver circuit a03 adopts a UCC27324 series high peak driver chip, the source of the first synchronous rectification fet a01 is connected to the S2 pin of the synchronous filter a04, the drain of the first synchronous rectification fet a01 is connected to the D2 pin of the synchronous filter a04 through a parallel diode D01 and a resistor R05, the source of the second synchronous rectification fet a02 is connected to the S1 pin of the synchronous filter a04, the drain of the second synchronous rectification fet a02 is connected to the D1 pin of the synchronous filter a04 through a parallel diode D02 and a resistor R06, the drain of the first synchronous rectification fet a01 and the source of the resistor R03, the gate series resistor R04 of the first synchronous rectification field-effect tube A01 is connected with the OUTA pin of the high-power driver circuit A03, the resistor R02 is connected between the gate and the source of the second synchronous rectification field-effect tube A02, the gate series resistor R01 of the second synchronous rectification field-effect tube A02 is connected with the OUTB pin of the high-power driver circuit A03, the source of the first synchronous rectification field-effect tube A01 is connected with the source of the second synchronous rectification field-effect tube A02, the capacitor C02 is connected between the pin D1 and the pin S1 of the synchronous filter A04, the capacitor C01 is connected between the pin D2 and the pin S2 of the synchronous filter A04, and the drain of the first synchronous rectification field-effect tube A01 and the drain of the second synchronous rectification field-effect tube A02 are respectively connected with the secondary winding of the transformer T01.
The first output port of the single chip microcomputer is connected with an INB pin of a high-power driver circuit A03 after being connected with a resistor R09 and an inductor L01 in series, one end of a resistor R12 is connected with a G1 pin of a synchronous filter A04, the other end of the resistor R12 is connected on a line between the inductor L01 and the INB pin of the high-power driver circuit A03, a second output port of the single chip microcomputer is connected with an INA pin of a high-power driver circuit A03 after being connected with a resistor R10 and an inductor L02 in series, one end of a resistor R11 is connected with a G2 pin of the synchronous filter A04, and the other end of the resistor R11 is connected on.
The synchronous rectification control device utilizes two output ports of the single chip microcomputer and two synchronous filters of the synchronous filter A04 to alternately control the complementary conduction of the first synchronous rectification field-effect tube A01 and the second synchronous rectification field-effect tube A02, so that the first synchronous rectification field-effect tube A01 and the second synchronous rectification field-effect tube A02 are controlled to be conducted in the process of completing full-wave rectification, and the power loss is reduced.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (1)
1. A synchronous rectification control device, comprising:
the current sampling circuit is used for acquiring a current intensity signal output by the switching power supply in real time;
the singlechip is used for judging that the current intensity signal reaches a threshold value to form a first rectification driving signal;
the synchronous filter is used for collecting a voltage drop signal between a source electrode and a drain electrode of a synchronous rectification field effect transistor 41 in the switching power supply 40 and forming a second rectification driving signal;
the signal combiner is used for combining the first rectification driving signal and the second rectification driving signal to form an enabling signal of the grid electrode of the synchronous rectification field effect transistor; the synchronous filter A04 adopts 11682 series intelligent filter chips;
the high-power synchronous rectification circuit comprises a first synchronous rectification field-effect tube A01, a second synchronous rectification field-effect tube A02, a synchronous filter A04 and a high-power driver circuit A03, wherein the high-power driver circuit A03 adopts a UCC27324 series high-peak driver chip, the source of the first synchronous rectification field-effect tube A01 is connected with the pin S2 of the synchronous filter A04, the drain of the first synchronous rectification field-effect tube A01 is connected with the pin D2 of the synchronous filter A04 through a diode D01 and a resistor R05 which are connected in parallel, the source of the second synchronous rectification field-effect tube A02 is connected with the pin S1 of the synchronous filter A04, the drain of the second synchronous rectification field-effect tube A02 is connected with the pin D1 of the synchronous filter A04 through a diode D02 and a resistor R06 which are connected in parallel, a resistor R01 is connected between the gate and the source of the first synchronous rectification field-effect tube A01, and the high-power driver circuit A01 is connected with the pin OU, a resistor R02 is connected between the grid and the source of a second synchronous rectification field-effect tube A02, the grid of the second synchronous rectification field-effect tube A02 is connected with the OUTB pin of a high-power driver circuit A03 after being connected with a resistor R01 in series, the source of a first synchronous rectification field-effect tube A01 is connected with the source of a second synchronous rectification field-effect tube A02, a capacitor C02 is connected between the pin D1 and the pin S1 of a synchronous filter A04, a capacitor C01 is connected between the pin D2 and the pin S2 of a synchronous filter A04, and the drain of the first synchronous rectification field-effect tube A01 and the drain of the second synchronous rectification field-effect tube A02 are respectively connected with the secondary winding of a transformer T01; the first output port of the single chip microcomputer is connected with an INB pin of a high-power driver circuit A03 after being connected with a resistor R09 and an inductor L01 in series, one end of a resistor R12 is connected with a G1 pin of a synchronous filter A04, the other end of the resistor R12 is connected on a line between the inductor L01 and the INB pin of the high-power driver circuit A03, a second output port of the single chip microcomputer is connected with an INA pin of a high-power driver circuit A03 after being connected with a resistor R10 and an inductor L02 in series, one end of a resistor R11 is connected with a G2 pin of the synchronous filter A04, and the other end of the resistor R11 is connected on.
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| CN201810116515.6A CN108183617B (en) | 2018-02-06 | 2018-02-06 | Synchronous rectification control method and control device |
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| CN201810116515.6A CN108183617B (en) | 2018-02-06 | 2018-02-06 | Synchronous rectification control method and control device |
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| CN108183617A CN108183617A (en) | 2018-06-19 |
| CN108183617B true CN108183617B (en) | 2020-06-19 |
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| CN109149968B (en) * | 2018-08-27 | 2020-07-28 | 重庆西南集成电路设计有限责任公司 | Synchronous rectifier diode and synchronous rectification control circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8063615B2 (en) * | 2007-03-27 | 2011-11-22 | Linear Technology Corporation | Synchronous rectifier control for synchronous boost converter |
| CN101997438B (en) * | 2009-08-27 | 2014-07-23 | 台达电子工业股份有限公司 | Compensating device for synchronous rectification control and method thereof |
| CN102157920B (en) * | 2011-03-18 | 2013-10-09 | 华为技术有限公司 | Synchronous rectification control circuit and control method thereof |
| CN102723856B (en) * | 2012-07-02 | 2014-06-25 | 矽力杰半导体技术(杭州)有限公司 | Synchronous rectifier control circuit and switch power supply employing same |
| CN202889179U (en) * | 2012-10-08 | 2013-04-17 | 北京动力源科技股份有限公司 | Power switch tube driving circuit applied to synchronous rectification |
| CN103490605B (en) * | 2013-10-12 | 2015-12-23 | 成都芯源***有限公司 | Isolated switch converter and controller and control method thereof |
| CN203883693U (en) * | 2014-06-06 | 2014-10-15 | 河北汇能欣源电子技术有限公司 | Switching inductive current-type synchronous rectifying circuit with phase compensation function |
| CN104319996B (en) * | 2014-10-30 | 2018-06-19 | 武汉大学 | A kind of synchronous rectification buck converter chip with high-precision current detection |
| CN204948393U (en) * | 2015-04-17 | 2016-01-06 | 东莞市盈聚电子有限公司 | The LED drive circuit that a kind of stability is high |
| CN105119505B (en) * | 2015-09-14 | 2017-11-07 | 矽力杰半导体技术(杭州)有限公司 | A kind of synchronous rectification control method and circuit of synchronous rectification |
| CN107508468B (en) * | 2016-08-29 | 2023-05-16 | 杰华特微电子股份有限公司 | Control circuit and method of isolated switching power supply and isolated switching power supply |
| CN106685201A (en) * | 2016-12-20 | 2017-05-17 | 杰华特微电子（张家港）有限公司 | Switch circuit control method and switch circuit |
| CN107425728B (en) * | 2017-02-28 | 2019-03-29 | 东南大学 | A kind of digital optimal control method and its system of the synchronous rectification of LLC full-bridge converter |
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