CN110535353A - Self-powered synchronous rectification adjusts circuit and switch power supply system - Google Patents
Self-powered synchronous rectification adjusts circuit and switch power supply system Download PDFInfo
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- CN110535353A CN110535353A CN201910997562.0A CN201910997562A CN110535353A CN 110535353 A CN110535353 A CN 110535353A CN 201910997562 A CN201910997562 A CN 201910997562A CN 110535353 A CN110535353 A CN 110535353A
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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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- 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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- Power Engineering (AREA)
- Rectifiers (AREA)
- Dc-Dc Converters (AREA)
Abstract
It is driven the present invention relates to a kind of self-powered synchronous rectification and adjusts circuit and switch power supply system, switch control module exports second switch signal when Switching Power Supply turns off, so that first switch end and the conducting of second switch end of semiconductor switch device control semiconductor switch device, the grid of first synchronous rectification tube grid and the second synchronous rectifier is pulled low to ground potential, quickly to reduce the grid voltage of the first synchronous rectifier grid voltage and the second synchronous rectifier, with reduce Switching Power Supply booting when the first synchronous rectifier and the second synchronous rectifier caused by stress and anti-sink current, be conducive to improve the input voltage range and output range of regulation of Switching Power Supply, and guarantee the reliability of Switching Power Supply.
Description
Technical field
The present invention relates to switch power technology fields, drive more particularly to a kind of self-powered synchronous rectification and adjust circuit and open
Close power-supply system.
Background technique
In recent years, with the continuous development of electronic technology, so that the operating voltage of circuit is lower and lower, electric current is increasingly
Greatly, operating on low voltage can be such that the overall power consumption of circuit reduces.But in the output of low-voltage, high-current, output end it is whole
It is especially prominent to flow diode losses.Fast recovery diode or Ultrafast recovery diode are up to 1.0-2.0V, even if using low pressure drop
Schottky diode, can also generate the pressure drop of about 0.6V, this results in rectifier loss to increase, power-efficient decline.Assuming that
Using the 3.3V even supply voltage of 1.8V or 1.5V, consumed circuit is up to 20A.The rectification of Ultrafast recovery diode at this time
Loss has been approached the 50% of even more than output power of power supply.Even if the loss on rectifying tube also can using Schottky diode
Reach (18%-40%) P0, accounts for 60% or more of power supply total losses.Therefore, traditional diode rectifier circuit has been unable to satisfy
The needs for realizing low-voltage, high-current switch high efficiency of power supply and small size become restriction DC-DC converter and improve efficiency
Bottleneck.
Synchronous rectification is using a new technique of MOSFET substitution rectifier diode, and it is straight that it can greatly improve direct current-
The efficiency of current converter and there is no as Schottky barrier voltage and caused by dead zone voltage.Replaced with power MOSFET and is rectified
When diode, it is desirable that gate voltage must be synchronous with voltage-phase holding is rectified, because of referred to herein as synchronous rectification.Straight
In stream-DC converter, synchronous rectification has become the mark of modern switch power technology.All high level switch electricity
Source must have synchronous rectification.It is no longer limited to these low output voltage fields 5V, 3.3V, 2.5V already in using face,
It is exported now up to 12V, 15V, 19V to 24V or more, is nearly all using synchronous rectification.For the change of high-power output
Parallel operation is general to be relatively suitble to using the bridge-type or push-pull topology of transformer bi-directional symmetrical work.It is former in such two-way topology
Side generally can be full-bridge, the symmetrical structure that secondary side is recommended.
Wherein, since the output voltage of Switching Power Supply is by output capacitance clamper, zero Shi Kaiguan is not dropped in output voltage
The stress and anti-sink current that the unexpected synchronous startup rectifying tube of power supply can generate limit the input voltage range of Switching Power Supply and defeated
Range of regulation out reduces the reliability of Switching Power Supply.
Summary of the invention
Based on this, it is necessary to for when output voltage does not drop to zero the unexpected synchronous startup rectifying tube of Switching Power Supply can produce
Raw stress and anti-sink current limit the input voltage range and output range of regulation of Switching Power Supply, reduce Switching Power Supply
This problem of reliability provides a kind of self-powered synchronous rectification driving and adjusts circuit and switch power supply system.
A kind of self-powered synchronous rectification driving adjusting circuit, comprising:
Switch control module, it is defeated in Switching Power Supply shutdown for exporting first switch signal in Switching Power Supply conducting
Second switch signal out；
Semiconductor switch device, the controlled end of semiconductor switch device is for accessing first switch signal or second switch letter
Number, the first switch end of semiconductor switch device is used to be separately connected the grid and the second synchronous rectifier of the first synchronous rectifier
Grid, the second switch end of semiconductor switch device is for being grounded；Wherein, semiconductor switch device is in access first switch letter
Number when, control semiconductor switch device first switch end and second switch end shutdown；Semiconductor switch device is in access second
When switching signal, first switch end and the conducting of second switch end of semiconductor switch device are controlled.
Above-mentioned self-powered synchronous rectification driving adjusts circuit, and switch control module exports second switch when Switching Power Supply turns off
Signal, so that the first switch end of semiconductor switch device control semiconductor switch device and the conducting of second switch end, first is same
The grid of step rectification tube grid and the second synchronous rectifier is pulled low to ground potential, quickly to reduce the first synchronous rectification tube grid
The grid voltage of voltage and the second synchronous rectifier is synchronized with reducing Switching Power Supply first synchronous rectifier and second in booting
Stress caused by rectifying tube and anti-sink current are conducive to the input voltage range for improving Switching Power Supply and output range of regulation,
And guarantee the reliability of Switching Power Supply.
It in one of the embodiments, further include the first drive module；First drive module includes the first auxiliary winding, the
One diode, the first NMOS tube and the first PMOS tube；
First auxiliary winding is coupled with the primary side winding of Switching Power Supply；The Same Name of Ends of first auxiliary winding is separately connected first
The anode of diode and the grid of the first PMOS tube；The different name end of first auxiliary winding connects the source electrode of the first PMOS tube；First
The cathode of diode connects the source electrode of the first NMOS tube, and the drain electrode of the first NMOS tube is separately connected the drain electrode and the of the first PMOS tube
The grid of one synchronous rectifier.
It in one of the embodiments, further include the second drive module；Second drive module includes the second auxiliary winding, the
Two diodes, the second NMOS tube and the second PMOS tube；
Second auxiliary winding is coupled with the primary side winding of Switching Power Supply；The different name end of second auxiliary winding is separately connected second
The anode of diode and the grid of the second PMOS tube；The Same Name of Ends of second auxiliary winding connects the source electrode of the second PMOS tube；Second
The cathode of diode connects the source electrode of the second NMOS tube, and the drain electrode of the second NMOS tube is separately connected the drain electrode and the of the second PMOS tube
The grid of two synchronous rectifiers, the source electrode of the second PMOS tube are also used to connect the drain electrode of the second synchronous rectifier.
It in one of the embodiments, further include clamp voltage setup unit；
Clamp voltage setup unit is used to set the grid voltage of the first NMOS tube and the grid clamping electricity of the second NMOS tube
Pressure.
Voltage clamping unit includes first resistor, second resistance, first capacitor, pressure stabilizing two in one of the embodiments,
Pole pipe and three sections of diodes；
First resistor one end connection switch power secondary winding different name end, the first resistor other end connect three sections of diodes
The second end of first end, three sections of diodes is used to be separately connected the grid of the first synchronous rectifier and the grid of the second synchronous rectifier
The third end of pole, three sections of diodes is separately connected the cathode of one end of second resistance, one end of first capacitor and zener diode,
The third end of three sections of diodes is also used to be separately connected the grid of the first NMOS tube and the grid of the second NMOS tube, second resistance
The anode of the other end, the other end of the second capacitor and zener diode is all connected with the Same Name of Ends of the second auxiliary winding.
Switch control module includes third diode, the second capacitor, third capacitor, third in one of the embodiments,
Resistance, the 4th resistance and PNP triode；
The anode of third diode is used for the positive output end of connection switch power supply, and the cathode of third diode for leading to respectively
Cross the negative output terminal of the second capacitor and 3rd resistor connection switch power supply；The emitter connection third diode of PNP triode
Cathode, the positive output end of the base stage connection switch power supply of PNP triode, the collector connection of PNP triode for passing through respectively
The negative output terminal of third capacitor and 3rd resistor connection switch power supply, the collector of PNP triode are also used to export first switch
Signal or second switch signal.
Semiconductor switch device includes third NMOS tube in one of the embodiments,；
The grid of third NMOS tube is used for accessing first switch signal or second switch signal, the source electrode of third NMOS tube
In the negative output terminal of connection switch power supply, the drain electrode of third NMOS tube is for being separately connected the grid and of the first synchronous rectifier
The grid of two synchronous rectifiers.
It in one of the embodiments, further include the first protective module and the second protective module；
The first switch end of semiconductor switch device is used to connect the grid of the first synchronous rectifier by the first protective module
Pole, the first switch end of semiconductor switch device are also used to connect the grid of the second synchronous rectifier by the second protective module.
The first protective module includes the 4th diode in one of the embodiments, and the second protective module includes the five or two
Pole pipe；
The first switch end of semiconductor switch device connects the cathode of the 4th diode, and the anode of the 4th diode is for connecting
Connect the grid of the first synchronous rectifier；
The first switch end of semiconductor switch device connects the cathode of the 5th diode, and the anode of the 5th diode is for connecting
Connect the grid of the second synchronous rectifier.
A kind of switch power supply system, including primary circuit, primary side winding, secondary circuit, vice-side winding and any of the above-described
The self-powered synchronous rectification of embodiment adjusts circuit；
Primary circuit includes first switch device, second switch device, third switching device and the 4th switching device；Secondary side
Circuit includes the first synchronous rectifier, the second synchronous rectifier, outputting inductance and output capacitance；
The first switch end of the first switch end connection third switching device of first switch device；The of second switch device
One switch terminals connect the first switch end of the 4th switching device；The second switch end of first switch device connects second switch device
Second switch end, the second switch end of third switching device connects the second switch end of the 4th switching device；
One end of the second switch end connection primary side winding of first switch device, the second switch end of third switching device connects
Connect the other end of primary side winding；
The different name end of vice-side winding connects the source electrode of the first synchronous rectifier, and the drain electrode of the first synchronous rectifier passes sequentially through
Output capacitance connects the common end of secondary coil with outputting inductance, and the drain electrode of the first synchronous rectifier connects the second synchronous rectifier
Drain electrode, the second synchronous rectifier source electrode connection secondary coil Same Name of Ends.
Above-mentioned switch power supply system, switch control module export second switch signal when Switching Power Supply turns off, so that half
Conductor switching device controls first switch end and the conducting of second switch end of semiconductor switch device, the first synchronous rectification tube grid
It is pulled low to ground potential with the grid of the second synchronous rectifier, quickly to reduce the first synchronous rectifier grid voltage and second together
Walk rectifying tube grid voltage, with reduce Switching Power Supply booting when the first synchronous rectifier and the second synchronous rectifier produced by
Stress and anti-sink current, be conducive to improve Switching Power Supply input voltage range and output range of regulation, and guarantee switch
The reliability of power supply.
Detailed description of the invention
Fig. 1 is that the self-powered synchronous rectification driving of an embodiment adjusts circuit modular structure figure；
Fig. 2 is that the self-powered synchronous rectification driving of an embodiment adjusts circuit diagram；
Fig. 3 is that the self-powered synchronous rectification driving of another embodiment adjusts circuit diagram；
Fig. 4 is the switch power supply system structural schematic diagram of an embodiment.
Specific embodiment
Purpose, technical solution and technical effect for a better understanding of the present invention, below in conjunction with drawings and examples
Further explaining illustration is carried out to the present invention.State simultaneously, embodiments described below for explaining only the invention, not
For limiting the present invention
It is driven the embodiment of the invention provides a kind of self-powered synchronous rectification and adjusts circuit.
Fig. 1 is that the self-powered synchronous rectification driving of an embodiment adjusts circuit modular structure figure, as shown in Figure 1, including mould
Block 100 and module 101:
Switch control module 100, for exporting first switch signal in Switching Power Supply conducting, in Switching Power Supply shutdown
Export second switch signal；
Semiconductor switch device 101, the controlled end of semiconductor switch device is for accessing first switch signal or second opening
OFF signal, the grid g1 and second that the first switch end of semiconductor switch device is used to be separately connected the first synchronous rectifier M1 are same
The grid g2 of rectifying tube M2 is walked, the second switch end of semiconductor switch device is for being grounded；Wherein, semiconductor switch device is connecing
When entering first switch signal, first switch end and the shutdown of second switch end of semiconductor switch device are controlled；Semiconductor switching device
Part controls first switch end and the conducting of second switch end of semiconductor switch device when accessing second switch signal.
Wherein, switch control module 100 is when exporting first switch signal, the first switch of semiconductor switch device 101
End and the shutdown of second switch end.Switch control module 100 is when exporting second switch signal, and the of semiconductor switch device 101
One switch terminals and the conducting of second switch end, semiconductor switch device 101 are same to the grid g1 and second of the first synchronous rectifier M1
The grid g2 of step rectifying tube M2 is pulled low to ground, is released the grid of the first synchronous rectifier M1 by semiconductor switch device 101
The grid g2 voltage of g1 voltage and the second synchronous rectifier M2, the grid g1 voltage of the first synchronous rectifier M1 and second synchronize it is whole
The grid g2 voltage of flow tube M2 is rapidly reduced to zero.
Switch control module 100 is separately connected the positive output end Vout+ of Switching Power Supply and bears in one of the embodiments,
Output end vo ut-, the output voltage by accessing Switching Power Supply judge Switching Power Supply on or off, to export first switch letter
Number or second switch signal.
Switch control module 100 includes single-chip microcontroller or comparison circuit in one of the embodiments,.
Semiconductor switch device 101 includes switching tube, metal-oxide-semiconductor or triode in one of the embodiments,.With derailing switch
Part is selected for metal-oxide-semiconductor, the grid access first switch signal or second switch signal of metal-oxide-semiconductor, in access first switch signal
When metal-oxide-semiconductor source electrode and drain electrode turn off, when access second switch signal the source electrode of metal-oxide-semiconductor and drain electrode conducting.
Fig. 2 is that the self-powered synchronous rectification driving of an embodiment adjusts circuit diagram, such as Fig. 2 in one of the embodiments,
Shown, switch control module 100 includes third diode D3, the second capacitor C2, third capacitor C3,3rd resistor R3, the 4th electricity
Hinder R4 and PNP triode Q1；
The anode of third diode D3 is used for the positive output end Vout+ of connection switch power supply, the cathode of third diode D3
For passing through the negative output terminal Vout- of the second capacitor C2 and 3rd resistor R3 connection switch power supply respectively；The transmitting of PNP triode
Pole connects the cathode of third diode D3, tri- pole positive output end Vout+, PNP of the base stage connection switch power supply of PNP triode Q1
The collector connection of pipe is used to pass through respectively the negative output terminal Vout- of third capacitor C3 and 3rd resistor R3 connection switch power supply,
The collector of PNP triode Q1 is also used to export first switch signal or second switch signal.
Wherein, as shown in Fig. 2, having output between positive output end Vout+ and negative output terminal Vout- when Switching Power Supply conducting
The collector of voltage, PNP triode Q1 shutdown, PNP triode Q1 exports first switch signal (logic low).When switch electricity
After the shutdown of source, third diode D3 conducting establishes voltage on the second capacitor C2, due to PNP triode Q1 emitter voltage by
Second capacitor C2 maintains slowly decline, therefore the base voltage decrease speed of PNP triode Q1 is faster than collector voltage, tri- pole PNP
The collector of pipe Q1 conducting, PNP triode Q1 exports second switch signal (logic high).
In one of the embodiments, as shown in Fig. 2, semiconductor switch device 101 includes third NMOS tube QN3；
The grid of third NMOS tube QN3 is used to access first switch signal or second switch signal, third NMOS tube QN3's
Source electrode is used for the negative output terminal Vout- of connection switch power supply, the drain electrode of third NMOS tube QN3 for be separately connected first synchronize it is whole
The grid g2 of the grid g1 of flow tube M1 and the second synchronous rectifier M2.
As shown in Fig. 2, when the collector of PNP triode Q1 exports first switch signal (logic low), third
NMOS tube QN3 shutdown.When the collector of PNP triode Q1 exports second switch signal (logic low), third NMOS tube
The grid g2 of QN3 conducting, the grid g1 of the first synchronous rectifier M1 and the second synchronous rectifier M2 are pulled low to Switching Power Supply
Negative output terminal Vout-, i.e. ground connection (logic low).
Fig. 3 is that the self-powered synchronous rectification driving of another embodiment adjusts circuit diagram in one of the embodiments, such as
Shown in Fig. 3, it further includes the first drive module 200 that the self-powered synchronous rectification driving of another embodiment, which adjusts circuit,；First drives
Dynamic model block 200 includes the first auxiliary winding V1, first diode D1, the first NMOS tube QN1 and the first PMOS tube QP1；
First auxiliary winding V1 is coupled with the primary side winding of Switching Power Supply；The Same Name of Ends of first auxiliary winding V1 is separately connected
The anode of first diode D1 and the grid of the first PMOS tube QP1；The different name end of first auxiliary winding V1 connects the first PMOS tube
The source electrode of QP1；The cathode of first diode D1 connects the source electrode of the first NMOS tube QN1, and the drain electrode of the first NMOS tube QN1 connects respectively
Meet drain electrode and the grid g1 of the first synchronous rectifier M1 of the first PMOS tube QP1.
Wherein, as shown in figure 3, clamping down on the grid g1 voltage (packet of the first synchronous rectifier M1 by the first drive module 200
Include positive pressure or negative pressure), play the role of protecting the first synchronous rectifier M1.
In one of the embodiments, as shown in figure 3, the self-powered synchronous rectification driving of another embodiment adjusts circuit
It further include the second drive module 201；Second drive module 201 includes the second auxiliary winding V2, the second diode D2, the 2nd NMOS
Pipe QN2 and the second PMOS tube QP2；
Second auxiliary winding V2 is coupled with the primary side winding of Switching Power Supply；The different name end of second auxiliary winding V2 is separately connected
The anode of second diode D2 and the grid of the second PMOS tube QP2；The Same Name of Ends of second auxiliary winding V2 connects the second PMOS tube
The source electrode of QP2；The cathode of second diode D2 connects the source electrode of the second NMOS tube QN2, and the drain electrode of the second NMOS tube QN2 connects respectively
The drain electrode and the grid g2 of the second synchronous rectifier M2, the source electrode of the second PMOS tube QP2 for meeting the second PMOS tube QP2 are also used to connect
The drain electrode of second synchronous rectifier M2.
Wherein, as shown in figure 3, clamping down on the grid g2 voltage (packet of the second synchronous rectifier M2 by the second drive module 201
Include positive pressure or negative pressure), play the role of protecting the second synchronous rectifier M2.
It further includes clamper that the self-powered synchronous rectification driving of another embodiment, which adjusts circuit, in one of the embodiments,
Voltage setup unit 202；
Clamp voltage setup unit 202 is used to set the grid voltage of the first NMOS tube QN1 and the grid of the second NMOS tube QN2
Pole clamp voltage.
Wherein, clamp voltage setup unit 202 is used to set the clamp voltage and the second driving mould of the first drive module 200
The clamp voltage of block 201.The first drive can be changed by changing clamp voltage setup unit 202 in one of the embodiments,
The clamp voltage of the clamp voltage of dynamic model block 200 and the second drive module 201.Clamp voltage is set in one of the embodiments,
Order member 202 includes potential-divider network circuit or voltage regulator circuit.
In one of the embodiments, as shown in figure 3, voltage clamping unit 202 includes first resistor R1, second resistance
R2, first capacitor C1, zener diode CR1 and three sections of diode CR2；
The one end first resistor R1 connection switch power secondary winding different name end, the first resistor R1 other end connect three section of two pole
The first end of pipe CR2, the second end of three sections of diode CR1 are used to be separately connected the grid g1 and second of the first synchronous rectifier M1
The grid g2 of synchronous rectifier M2, the third end of three sections of diode CR2 is separately connected one end of second resistance R2, first capacitor C1
One end and zener diode CR1 cathode, the third end of three sections of diode CR2 is also used to be separately connected the first NMOS tube QN1
Grid and the second NMOS tube QN2 grid, the other end and zener diode of the other end of second resistance R2, the second capacitor C2
The anode of CR1 is all connected with the Same Name of Ends L1 of the second auxiliary winding V2.
Wherein, as shown in figure 3, passing through the type selecting of each device in voltage clamping unit 202, the first NMOS tube QN1's of setting
The grid voltage of grid voltage and the second NMOS tube QN2.
It further includes first that the self-powered synchronous rectification driving of another embodiment, which adjusts circuit, in one of the embodiments,
Protective module and the second protective module；
The first switch end of semiconductor switch device 101 is used to connect the first synchronous rectifier M1 by the first protective module
Grid g1, the first switch end of semiconductor switch device 101 be also used to by the second protective module connect the second synchronous rectification
The grid g2 of pipe M2.
Wherein, the first synchronous rectifier M1 is protected by the first protective module, it is same by the second protective module protection second
Walk rectifying tube M2.
The first protective module includes current-limiting circuit or overvoltage crowbar in one of the embodiments,.One wherein
In embodiment, the second protective module includes current-limiting circuit or overvoltage crowbar.
In one of the embodiments, as shown in figure 3, the first protective module includes the 4th diode D4, the second protection mould
Block includes the 5th diode D5；
The first switch end of semiconductor switch device 101 connects the cathode of the 4th diode D4, and the 4th diode D4 is just
Pole is used to connect the grid g1 of the first synchronous rectifier M1；
The first switch end of semiconductor switch device 101 connects the cathode of the 5th diode D5, and the 5th diode D5 is just
Pole is used to connect the grid g2 of the second synchronous rectifier M2.
Wherein, as shown in figure 3, by the 4th diode D4, guarantee that the grid g1 of the first synchronous rectifier M1 can successively lead to
The anode and cathode for crossing the 4th diode D4 prevent the reversed electricity at the first switch end of semiconductor switch device 101 to ground
Pressure or electric current influence the grid g1 of the first synchronous rectifier M1.As shown in figure 3, guaranteeing that second is synchronous by the 5th diode D5
The anode and cathode that the grid g2 of rectifying tube M2 can pass sequentially through the 5th diode D5 prevent semiconductor switch device to ground
The backward voltage or electric current at 101 first switch end influence the grid g2 of the second synchronous rectifier M2.
The self-powered synchronous rectification driving of any of the above-described embodiment adjusts circuit, and switch control module 100 is closed in Switching Power Supply
Second switch signal is exported when disconnected so that semiconductor switch device 101 control semiconductor switch device 101 first switch end and
The grid g2 of the conducting of second switch end, the first synchronous rectifier M1 grid and the second synchronous rectifier M2 are pulled low to ground potential,
Quickly to reduce the grid g2 voltage of the first synchronous rectifier M1 grid voltage and the second synchronous rectifier M2, to reduce switch electricity
Source stress and anti-sink current caused by the first synchronous rectifier M1 and the second synchronous rectifier M2 in booting, is conducive to improve
The input voltage range and output range of regulation of Switching Power Supply, and guarantee the reliability of Switching Power Supply.
The embodiment of the present invention also provides a kind of switch power supply system.
Fig. 4 is the switch power supply system structural schematic diagram of an embodiment, as shown in figure 4, the switch electricity of an embodiment
Source system includes oneself of primary circuit 300, primary side winding T1, secondary circuit 301, vice-side winding figure and any of the above-described embodiment
It drives synchronous rectification and adjusts circuit；
Primary circuit 300 includes first switch device Q100, second switch device Q101, third switching device Q102 and the
Four switching device Q103；Secondary circuit 301 include the first synchronous rectifier M1, the second synchronous rectifier M2, outputting inductance L0 and
Output capacitance C0；
The first switch end of the first switch end connection third switching device Q102 of first switch device Q100；Second switch
The first switch end of device Q101 connects the first switch end of the 4th switching device Q103；The second of first switch device Q100 opens
The second switch end of Guan Duan connection second switch device Q101, the 4th switch of second switch end connection of third switching device Q102
The second switch end of device Q103；
One end of the second switch end connection primary side winding T1 of first switch device Q100, the of third switching device Q102
The other end of two switch terminals connection primary side winding T1；
The source electrode of different name end L2 the first synchronous rectifier of connection M1 of vice-side winding T2, the drain electrode of the first synchronous rectifier M1
Pass sequentially through the common end Com that output capacitance C0 connects secondary coil T2 with outputting inductance L0, the leakage of the first synchronous rectifier M1
Pole connects the drain electrode of the second synchronous rectifier M2, the Same Name of Ends L1 of the source electrode connection secondary coil T2 of the second synchronous rectifier M2.
Above-mentioned switch power supply system, switch control module 100 export second switch signal when Switching Power Supply turns off, so that
Semiconductor switch device 101 control semiconductor switch device 101 first switch end and second switch end conducting, first synchronize it is whole
The grid g2 of flow tube M1 grid and the second synchronous rectifier M2 are pulled low to ground potential, quickly to reduce the first synchronous rectifier M1
The grid g2 voltage of grid voltage and the second synchronous rectifier M2, to reduce Switching Power Supply first synchronous rectifier M1 in booting
With stress caused by the second synchronous rectifier M2 and anti-sink current, be conducive to improve the input voltage range of Switching Power Supply and defeated
Range of regulation out, and guarantee the reliability of Switching Power Supply.
Each technical characteristic of above embodiments can be combined arbitrarily, for simplicity of description, not to above-described embodiment
In each technical characteristic it is all possible combination be all described, as long as however, the combination of these technical characteristics be not present lance
Shield all should be considered as described in this specification.
Only several embodiments of the present invention are expressed for above embodiments, and the description thereof is more specific and detailed, but can not
Therefore it is construed as limiting the scope of the patent.It should be pointed out that for those of ordinary skill in the art, In
Under the premise of not departing from present inventive concept, various modifications and improvements can be made, and these are all within the scope of protection of the present invention.
Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of self-powered synchronous rectification driving adjusts circuit characterized by comprising
Switch control module, it is defeated in Switching Power Supply shutdown for exporting first switch signal in Switching Power Supply conducting
Second switch signal out；
Semiconductor switch device, the controlled end of the semiconductor switch device is for accessing the first switch signal or described the
Two switching signals, the first switch end of the semiconductor switch device are used to be separately connected the grid and the of the first synchronous rectifier
The grid of two synchronous rectifiers, the second switch end of the semiconductor switch device is for being grounded；Wherein, the semiconductor switch
Device controls first switch end and the shutdown of second switch end of the semiconductor switch device when accessing first switch signal；
The semiconductor switch device controls the first switch end and of the semiconductor switch device when accessing second switch signal
The conducting of two switch terminals.
2. self-powered synchronous rectification according to claim 1 adjusts circuit, which is characterized in that further include the first drive module；
First drive module includes the first auxiliary winding, first diode, the first NMOS tube and the first PMOS tube；
First auxiliary winding is coupled with the primary side winding of the Switching Power Supply；The Same Name of Ends of first auxiliary winding is distinguished
Connect the anode of the first diode and the grid of first PMOS tube；The different name end of first auxiliary winding connects institute
State the source electrode of the first PMOS tube；The cathode of the first diode connects the source electrode of first NMOS tube, the first NMOS
The drain electrode of pipe is separately connected drain electrode and the grid of the first synchronous rectifier of the first PMOS tube.
3. self-powered synchronous rectification according to claim 1 adjusts circuit, which is characterized in that further include the second drive module；
Second drive module includes the second auxiliary winding, the second diode, the second NMOS tube and the second PMOS tube；
Second auxiliary winding is coupled with the primary side winding of the Switching Power Supply；Distinguish at the different name end of second auxiliary winding
Connect the anode of second diode and the grid of second PMOS tube；The Same Name of Ends of second auxiliary winding connects institute
State the source electrode of the second PMOS tube；The cathode of second diode connects the source electrode of second NMOS tube, the 2nd NMOS
The drain electrode of pipe is separately connected drain electrode and the grid of the second synchronous rectifier of the second PMOS tube, and the source electrode of second PMOS tube is also
For connecting the drain electrode of the second synchronous rectifier.
4. self-powered synchronous rectification according to claim 2 or 3 adjusts circuit, which is characterized in that further include that clamp voltage is set
Order member；
The clamp voltage setup unit is used to set the grid voltage of first NMOS tube and the grid pincers of the second NMOS tube
Position voltage.
5. self-powered synchronous rectification according to claim 4 adjusts circuit, which is characterized in that the voltage clamping unit includes
First resistor, second resistance, first capacitor, zener diode and three sections of diodes；
First resistor one end connection switch power secondary winding different name end, described described three sections of the connection of the first resistor other end
The first end of diode, the second end of three sections of diodes are used to be separately connected grid and the institute of first synchronous rectifier
State the grid of the second synchronous rectifier, the third end of three sections of diodes is separately connected one end of the second resistance, described
The cathode of one end of first capacitor and the zener diode, the third end of three sections of diodes are also used to be separately connected described
The grid of the grid of first NMOS tube and the second NMOS tube, the other end of the other end of the second resistance, second capacitor
The Same Name of Ends of second auxiliary winding is all connected with the anode of the zener diode.
6. self-powered synchronous rectification according to claim 1 adjusts circuit, which is characterized in that the switch control module includes
Third diode, the second capacitor, third capacitor, 3rd resistor, the 4th resistance and PNP triode；
The anode of the third diode is used to connect the positive output end of the Switching Power Supply, and the cathode of the third diode is used
In the negative output terminal for connecting the Switching Power Supply with the 3rd resistor by second capacitor respectively；The PNP triode
Emitter connect the cathode of the third diode, the base stage of the PNP triode connects the positive output of the Switching Power Supply
End, the collector connection of the PNP triode is for opening described in being connected respectively by the third capacitor with the 3rd resistor
The negative output terminal in powered-down source, the collector of the PNP triode are also used to export the first switch signal or described second open
OFF signal.
7. self-powered synchronous rectification according to claim 1 adjusts circuit, which is characterized in that the semiconductor switch device packet
Include third NMOS tube；
The grid of the third NMOS tube is for accessing the first switch signal or the second switch signal, the third
The source electrode of NMOS tube is used to connect the negative output terminal of the Switching Power Supply, and the drain electrode of the third NMOS tube is for being separately connected
State the grid of the first synchronous rectifier and the grid of second synchronous rectifier.
8. self-powered synchronous rectification according to claim 1 adjusts circuit, which is characterized in that further include the first protective module and
Second protective module；
The first switch end of the semiconductor switch device is used to synchronize by first protective module connection described first whole
The grid of flow tube, the first switch end of the semiconductor switch device are also used to connect described the by second protective module
The grid of two synchronous rectifiers.
9. self-powered synchronous rectification according to claim 8 adjusts circuit, which is characterized in that first protective module includes
4th diode, second protective module include the 5th diode；
The first switch end of the semiconductor switch device connects the cathode of the 4th diode, and the 4th diode is just
Pole is used to connect the grid of first synchronous rectifier；
The first switch end of the semiconductor switch device connects the cathode of the 5th diode, and the 5th diode is just
Pole is used to connect the grid of second synchronous rectifier.
10. a kind of switch power supply system, which is characterized in that including primary circuit, primary side winding, secondary circuit, vice-side winding with
And self-powered synchronous rectification as claimed in any one of claims 1 to 9 adjusts circuit；
The primary circuit includes first switch device, second switch device, third switching device and the 4th switching device；It is described
Secondary circuit includes the first synchronous rectifier, the second synchronous rectifier, outputting inductance and output capacitance；
The first switch end of the first switch device connects the first switch end of the third switching device；The second switch
The first switch end of device connects the first switch end of the 4th switching device；The second switch end of the first switch device
Connect the second switch end of the second switch device, the second switch end connection of the third switching device the 4th switch
The second switch end of device；
The second switch end of the first switch device connects one end of the primary side winding, and the second of the third switching device
Switch terminals connect the other end of the primary side winding；
The different name end of the vice-side winding connects the source electrode of first synchronous rectifier, the drain electrode of first synchronous rectifier
Pass sequentially through the common end that the output capacitance connects the secondary coil with outputting inductance, the leakage of first synchronous rectifier
Pole connects the drain electrode of second synchronous rectifier, and the source electrode of second synchronous rectifier connects the of the same name of the secondary coil
End.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910997562.0A CN110535353A (en) | 2019-10-18 | 2019-10-18 | Self-powered synchronous rectification adjusts circuit and switch power supply system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910997562.0A CN110535353A (en) | 2019-10-18 | 2019-10-18 | Self-powered synchronous rectification adjusts circuit and switch power supply system |
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| CN201910997562.0A Pending CN110535353A (en) | 2019-10-18 | 2019-10-18 | Self-powered synchronous rectification adjusts circuit and switch power supply system |
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| CN105703642A (en) * | 2016-03-11 | 2016-06-22 | 广州金升阳科技有限公司 | Synchronous rectifier control circuit, method and switching power supply provided with same |
| CN208094444U (en) * | 2018-05-10 | 2018-11-13 | 雅达电子国际有限公司 | Self-device synchronous rectification circuit |
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2019
- 2019-10-18 CN CN201910997562.0A patent/CN110535353A/en active Pending
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| JP2006238648A (en) * | 2005-02-25 | 2006-09-07 | Sanken Electric Co Ltd | Dc converter |
| CN201690364U (en) * | 2010-05-21 | 2010-12-29 | 深圳市核达中远通电源技术有限公司 | Circuit for preventing current flowing backwards |
| CN105703642A (en) * | 2016-03-11 | 2016-06-22 | 广州金升阳科技有限公司 | Synchronous rectifier control circuit, method and switching power supply provided with same |
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Application publication date: 20191203 |