CN206060573U - Synchronous commutating control circuit - Google Patents
Synchronous commutating control circuit Download PDFInfo
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- CN206060573U CN206060573U CN201621012491.2U CN201621012491U CN206060573U CN 206060573 U CN206060573 U CN 206060573U CN 201621012491 U CN201621012491 U CN 201621012491U CN 206060573 U CN206060573 U CN 206060573U
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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
Abstract
This utility model is related to switch power technology field, more particularly to a kind of synchronous commutating control circuit of Switching Power Supply.A kind of synchronous commutating control circuit, including internal electric source generation circuit, open circuit, breaking circuit, logic processing circuit and drive circuit, internal electric source produces circuit and produces voltage source VCC2, to power to each modular circuit in synchronous commutating control circuit；Open circuit arranges first and opens threshold value Vton1, produces the unlatching clock signal of synchronous rectifier and export to logic processing circuit；Breaking circuit arranges shut-off threshold value, produces the shut-off clock signal of synchronous rectifier, and exports to logic processing circuit；Logic processing circuit receives the clock signal of open circuit and breaking circuit output, and is processed as control signal and exports to drive circuit；Drive circuit drives synchronous rectifier, the synchronous rectifier controlled by synchronous commutating control circuit to be built in synchronous commutating control circuit.
Description
Technical field
This utility model is related to switch power technology field, the synchronous rectification control electricity of more particularly to a kind of Switching Power Supply
Road.
Background technology
Inverse-excitation type switch power-supply is widely used in small power electric origin system, due to adopting diode rectification, big in low pressure
In current and power supply system, the loss of diode is very big.In order to improve the efficiency of power-supply system, can be by from low conducting pressure
The Schottky diode of drop is alleviating this problem, but the Schottky diode of low conduction voltage drop is reverse pressure general relatively low,
It is difficult to meet and requires.Therefore, the Schottky diode of diode or low conduction voltage drop is replaced with the MOSFET of low conducting internal resistance
(Metal-Oxide-Semiconductor Field-Effect Transistor, metal oxide layer-quasiconductor-field effect are brilliant
Body pipe MOSFET) rectification is carried out, the pressure drop of MOSFET two ends is less, and loss is reduced, and greatly lifts the efficiency of power-supply system.Whole
During stream, the grid control signal of MOSFET needs and is rectified current phase synchronization, i.e. synchronous rectification.Synchronous rectification according to
Working method can be divided into outer drive type and self-powered type.Although self-powered type of drive simple structure, there is main switch and same
The common problem of step rectifier tube.Realized by the way of control circuit is increased more than outer type of drive.
Fig. 1 is a synchronous commutating control circuit for being typically applied to inverse-excitation type switch power-supply.Input power is included wherein
VIN1, the turn ratio are the transformator T11 of N1, primary side winding P11 of transformator T11, the vice-side winding S11 of transformator T11, former limit control
Circuit processed 1, power tube M11, the parasitic diode D11 of power tube M11 and dead resistance R11, sampling resistor R1cs, the first power supply
Ground GND1, external synchronous rectifier M12, the parasitic diode D12 of external synchronous rectifier M12 and dead resistance R12, output electricity
Hold C11, load resistance RL1, resistance RTOFF, resistance RTON1, output voltage VO 1, second source ground VSS1, synchronous rectification control
Circuit 1.
Synchronous commutating control circuit 1 includes：Internal electric source produces circuit 1, TOFF and produces circuit, synchronous rectifier unlatching electricity
Road 1, synchronous rectifier breaking circuit 1, synchronous rectification logic 1, two input with door, synchronous rectification driving circuit 1, VDS1 pins,
GATE pins, TOFF pins, TON1 pins, VDD1 pins, VEE1 pins.
Internal electric source produces circuit 1 and is connected to output voltage VO 1 by VDD1 pins, produces voltage source VCC1, wherein
To each module for power supply in synchronous commutating control circuit 1, the reference ground of synchronous commutating control circuit 1 is second source ground to VCC1
VSS1。
TOFF produces circuit and level is produced after the output signal for receiving synchronous rectification logic 1 for second source ground VSS1
And the persistent period is the pulse of toff, shields the output signal of synchronous rectification logic 1 by two inputs and door, it is ensured that external same
Walk in the resonance time after rectification and rectification after rectifier tube M12 shut-offs terminate and will not be again turned on external synchronous rectifier M12.
TOFF produces one end that an input of circuit is connected to resistance RTOFF by TOFF pins, and the other end of resistance RTOFF connects
Second source ground VSS1 is connected to, resistance RTOFF scalable toff is adjusted.
Synchronous rectifier open circuit 1 arrange turn-on threshold voltage be Vton1, and by detection VDS1 pins voltage
After comparing with turn-on threshold voltage Vton1, the signal for opening external synchronous rectifier M12 is produced, the signal duration is
Ton1, within the time period, it is ensured that external synchronous rectifier M12 is persistently opened.One input of synchronous rectifier open circuit 1
End is connected to one end of resistance RTON1 by TON1 pins, and the other end of RTON1 is connected to second source ground VSS1, adjustment electricity
Resistance RTON1 scalable ton1.
Synchronous rectifier breaking circuit 1 arrange shut-off threshold voltage be Vtoff1, and by detection VDS1 pins electricity
Press the signal that the external synchronous rectifier M12 of shut-off is produced after comparing with the shut-off threshold voltage vt off1 for arranging.
Synchronous rectification logic 1 processes the signal of synchronous rectifier open circuit 1 and the input of synchronous rectifier breaking circuit 1.
Simultaneously output is connected to TOFF and produces circuit module and produces signal toff all the way, another road output be connected to the one or two input with it is non-
One input of door.
Synchronous rectification driving circuit 1 drives external synchronous rectifier M12.
One input of synchronous rectifier open circuit 1, the input of synchronous rectifier breaking circuit 1 are drawn by VDS1
Foot is connected to the drain electrode of external synchronous rectifier M12, and another input of synchronous rectifier open circuit 1 passes through TON1 pins
One end of resistance RTON1 is connected to, the other end of resistance RTON1 is connected to second source ground VSS1, and synchronous rectifier opens electricity
The output on road 1 is connected to an input of synchronous rectification logic 1, and synchronous rectification logic 1 another input is connected to
The outfan of step rectifier tube breaking circuit 1, an outfan of synchronous rectification logic 1 be connected to TOFF produce one of circuit it is defeated
Enter end, TOFF produces one end that another input of circuit is connected to resistance RTOFF by TOFF pins, resistance RTOFF's
The other end is connected to second source ground VSS1, and another outfan of synchronous rectification logic 1 is connected to the one or two input and door
One input, the one or two input and another input of door are connected to another outfan that TOFF produces circuit, and first
The outfan of two inputs and door is connected to the input of synchronous rectification driving circuit 1, and the outfan of synchronous rectification driving circuit 1 leads to
Cross the grid that GATE pins are connected to external synchronous rectifier M12.
VIN1 is input power, is connected to one end of transformator T11 primary side windings P11, and the other end of primary side winding P11 connects
Be connected to one end of the drain electrode of power tube M11 and dead resistance R11 of power tube M11, dead resistance R11 of power tube M11 it is another
One end is connected to the negative electrode of the parasitic diode D11 of power tube M11, and the source electrode of power tube M11 is connected to current sense resistor
One end of R1cs, one end of primary-side-control circuit 1, the substrate of power tube M11, the sun of the parasitic diode D11 of power tube M11
Pole, the output of primary-side-control circuit 1 are connected to the grid of power tube M11, and the other end of current sense resistor R1cs is connected to
One power supply ground GND1.
One end of transformator T11 vice-side winding S11 be connected to one end of output capacitance C11, one end of load resistance RL1,
The VDD1 pins of output voltage VO 1 and synchronous commutating control circuit 1, output capacitance C11, the other end connection of load resistance RL1
To second source ground VSS1, the other end of transformator T11 vice-side winding S11 is connected to the VDS1 of synchronous commutating control circuit 1 and draws
Foot, the drain terminal of external synchronous rectifier M12, one end of dead resistance R12 of external synchronous rectifier M12, external synchronous rectification
The other end of dead resistance R12 of pipe M12 is connected to the negative electrode of the parasitic diode D12 of external synchronous rectifier M12, external same
The step substrate of rectifier tube M12, source electrode, the anode of the parasitic diode D12 of external synchronous rectifier M12, the one of resistance RTOFF
End, one end of resistance RTON1 are connected to second source ground VSS1, and the other end of resistance RTON1 is connected to synchronous rectification control
The RTON1 pins of circuit 1, the other end of resistance RTOFF are connected to the TOFF pins of synchronous commutating control circuit 1, external synchronization
The grid of rectifier tube M12 is connected to the GATE pins of synchronous commutating control circuit 1.
In FIG, when 1 driving power pipe M11 of primary-side-control circuit is turned on, transformator T11 starts storage energy, sampling
The terminal voltage that resistance R1cs is connected with power tube M11 sources begins to ramp up, and the external synchronous rectifier M12 of secondary is off shape
State, is powered for load resistance RL1 by output capacitance C11.When the terminal voltage that sampling resistor R1cs is connected with power tube M11 sources
After the given threshold in primary-side-control circuit 1,1 driving power pipe M11 of primary-side-control circuit shut-offs, external rectifier tube M12
Drain voltage VDS1 less than turn-on threshold voltage Vton1 of synchronous rectifier open circuit 1, produce and open synchronous rectifier
Signal, drives external rectifier tube M12 conductings by synchronous rectification driving circuit 1, and the energy stored in transformator T11 is by external whole
Flow tube M12 is transferred in output capacitance C11 and load resistance RL1.
As shown in Fig. 2 in cycle t11, the drain voltage waveform of external synchronous rectifier M12 is VDS1 pin waveforms,
After turn-on threshold voltage Vton1 of the VDS1 pin voltages less than synchronous rectifier open circuit 1, the generation persistent period is ton1
Signal, the voltage of the signal by second source ground VSS1 saltus steps to VCC1, through the input of synchronous rectification logic 1, two and door, same
The driving time delay t of step commutation driver circuit 1DON1Afterwards, GATE pin voltages rise, and open external synchronous rectifier M12.
Due to the presence of various dead resistances, parasitic capacitance, stray inductance in power-supply system, cause the voltage of VDS1 outside
Put after synchronous rectifier M12 is opened and produce vibration, the voltage of VDS1 may trigger the shut-off threshold of synchronous rectifier breaking circuit 1
Threshold voltage Vtoff1 and produce synchronous rectifier cut-off signals, by synchronous rectification logic 1, two input with door, synchronous rectification drive
GATE pin voltages are made to drop to second source ground VSS1 and close external synchronous rectifier M12 behind galvanic electricity road 1, it is external to avoid
Synchronous rectifier M12 open after turned off due to the oscillating voltage of VDS1, synchronous rectifier open circuit 1 produce the persistent period be
The signal of ton1, in synchronous rectification logic 1, shielding synchronous rectifier breaking circuit 1 is after external synchronous rectifier M12 is opened
The cut-off signals of generation.Therefore, need to be according to different electrical power system call interception ton1, it is ensured that external synchronous rectifier M12 is normally-open.
After external synchronous rectifier M12 is normally-open, the voltage of VDS1 begins to ramp up, when the voltage of VDS1 reach it is synchronous whole
After the shut-off threshold voltage vt off1 of flow tube breaking circuit 1, produce synchronous rectifier cut-off signals, by synchronous rectification logic 1,
GATE pin voltages are made to drop to second source ground VSS1 and close external same after two inputs and door, synchronous rectification driving circuit 1
Step rectifier tube M12, hereafter, power-supply system continues rectification by the parasitic diode D12 of external synchronous rectifier M12, VDS1's
Voltage declines immediately, it is possible to unlatching is produced again below turn-on threshold voltage Vton1 of synchronous rectifier open circuit 1 same
The signal of step rectifier tube；Additionally, after power-supply system rectification terminates, due to external synchronous rectifier M12 drain terminals parasitic capacitance and
The presence of vice-side winding S11, the voltage of VDS1 start vibration, and the voltage of VDS1 is also possible to less than synchronous rectifier open circuit
1 turn-on threshold voltage Vton1 and produce the signal for opening external synchronous rectifier M12.In above-mentioned two situations, if external
Synchronous rectifier M12 is again turned on, and can cause the 1 rapid decline of power-supply system output voltage VO, in turn result in power system failure.
It is above-mentioned to avoid the occurrence of, after the cut-off signals that 1 circuit of synchronous rectification logic responds synchronous rectifier breaking circuit 1,
1 circuit output signal of synchronous rectification logic produces toff signals, 1 circuit of toff signal shielding synchronous rectifications logic to TOFF modules
Output signal, it is ensured that external synchronous rectifier M12 will not be again turned in the toff times after shut-off.Need to be according to different electricity
Origin system adjusts toff, until voltages of the VDS1 after external synchronous rectifier M12 is not less than synchronous rectifier open circuit 1
Turn-on threshold voltage Vton1.
However, in frequency-converting power supply, different loads resistance RL1 may correspond to different operating frequencies or cycle.Such as
Shown in Fig. 2, it is to meet the external synchronous rectifier M12 within the t11 cycles reliably to turn off, is set by outer meeting resistance RTOFF
The toff times.If changing in t11 end cycle back loading resistance RL1, cause cycle t12 and t13 less than cycle t1, in week
The toff times produced in phase t12 are consistent with the toff that cycle t11 is produced, and as toff set of time is long, open in the t13 cycles
In a period of time of beginning, although having produced synchronous rectifier open signal, due to the shielding action of toff, time delay is being driven
tDON1Need afterwards synchronous rectifier could be opened through the time of t_s again, have impact on the efficiency of synchronous rectification, it is final to reduce negative at this
Carry the efficiency of lower power-supply system.
It is another as turn-on threshold voltage Vton1 of synchronous rectifier open circuit 1 varies with temperature very little, it is negligible not
Meter, and the parasitic body diode D12 conduction voltage drop of external power tube M12 has negative temperature coefficient, i.e., with the rising of temperature, post
The conduction voltage drop of raw body diode D12 can be reduced.In the case of a high temperature, the drain terminal voltage VDS1 of external power tube M12 may be high
In threshold value Vton1 of synchronous rectifier open circuit 1, synchronous rectifier open circuit 1 cannot produce synchronous rectifier and open letter
Number, it is impossible to synchronous rectification is realized, efficiency is substantially reduced at high temperature to cause power-supply system.
Utility model content
The technical problems to be solved in the utility model is：How synchronous commutating control circuit is designed, guaranteed using the solution
Certainly power-supply system during scheme realizes synchronous rectification at high temperature, lifts power-supply system efficiency under high temperature.
In order to solve above-mentioned technical problem, it is as follows that this utility model provides concrete utility model content：
A kind of synchronous commutating control circuit, including internal electric source generation circuit, open circuit, breaking circuit, logical process
Circuit and drive circuit, internal electric source produce circuit and produce voltage source VCC2, with to each module electricity in synchronous commutating control circuit
Road powers；Open circuit arranges first and opens threshold value Vton1, and produces the unlatching clock signal of synchronous rectifier and export to logic
Process circuit；Breaking circuit arrange shut-off threshold value, and produce the shut-off clock signal of synchronous rectifier export electricity to logical process
Road；Logic processing circuit receives the clock signal of open circuit and breaking circuit output, and is processed as control signal and exports to drive
Galvanic electricity road；Drive circuit drives synchronous rectifier, the synchronous rectifier controlled by synchronous commutating control circuit to be built in synchronous whole
In flow control circuit；Synchronous commutating control circuit, also including detection pipe, synchronous rectifier and detection pipe are same type device,
With identical temperature characterisitic；Detection pipe is connected between the drain electrode of synchronous rectifier and open circuit.That is the drain electrode of detection pipe
The drain electrode of synchronous rectifier is connected to, the source electrode of detection pipe is connected with open circuit, the grid of detection pipe is drawn for connecing electricity
Source ground.
Preferably, the synchronous rectifier and detection pipe are integrated chip structure, make on the same chip.It is synchronous whole
Flow tube is formed by several metal-oxide-semiconductors are integrated, several metal-oxide-semiconductors of synchronous rectifier and the integrated quantitative proportion of metal-oxide-semiconductor of detection pipe
For N：1, the current ratio for flowing through synchronous rectifier with detection pipe is N：1, then the resistance value of the dead resistance of each metal-oxide-semiconductor and inspection
The resistance proportion of the dead resistance of test tube isSo as to ensure the dead resistance two ends pressure drop of synchronous rectifier with detection
The dead resistance two ends pressure drop of pipe is equal.
Preferably, quantity N of the synchronous rectifier, if the maximum current that single MOS transistor device is allowed to flow through is A millis
Peace, and synchronous rectifier the operating current that passes through is needed in switching process is B amperes, then N values are 1000B:A, i.e.,
Preferably, the open circuit of the synchronous commutating control circuit, opens threshold by the parasitic diode of detection pipe
The pressure drop at value and dead resistance two ends is applied to the front end of open circuit, forms the drain voltage VDS2 of synchronous rectifier and opens
Circuit first unlatching threshold value Vton1 relative pressure, with lifted open circuit first unlatching threshold value Vton1 absolute value extremely
Second opens threshold value Vton2, so that it is guaranteed that synchronous rectifier is not by false triggering；Setting is combined with open circuit by detection pipe to open
Open the second unlatching threshold value Vton2 of circuit.
Preferably, the breaking circuit of described synchronous commutating control circuit, arranges shut-off threshold voltage vt off2, and will inspection
After the drain voltage of the synchronous rectifier of survey is compared with shut-off threshold voltage vt off2, the cut-off signals of synchronous rectifier are produced.
Preferably, the synchronous commutating control circuit, with five pins, the first pin VDS2 is by synchronous rectifier and inspection
The drain electrode of test tube is drawn, to be connected with transformer secondary winding；Parasitic diode of second pin VS by synchronous rectifier
Anode is drawn, to be connected with power supply；3rd pin VDD2 produces circuit by internal electric source and draws, to external output voltage
VO2；4th pin TON2 is drawn by open circuit, to outer meeting resistance RTON2；5th pin VEE2 is drawn by the grid of detection pipe
Go out, to be connected with power supply.
This utility model also provides a kind of synchronous rectification control method, comprises the steps, synchronous rectifier and detection pipe
Using same type device, with identical temperature characterisitic；Internal electric source produces step, produces voltage source VCC2, with to synchronous
In rectifier control circuit, each modular circuit is powered；Step is opened, first is arranged and is opened threshold value Vton1, and produce synchronous rectifier
Unlatching clock signal export to logic processing circuit；Shut-off step, arranges shut-off threshold value, and produces the shut-off of synchronous rectifier
Clock signal is exported to logic processing circuit；Logical process step, receives and opens clock signal and shut-off clock signal, and process
Export to drive circuit for control signal；Actuation step, drives synchronous rectifier according to control signal.
Preferably, described synchronous rectification control method, synchronous rectifier and detection pipe make on the same chip；It is synchronous
Rectifier tube is formed by several metal-oxide-semiconductors are integrated, several metal-oxide-semiconductors and the integrated quantity ratio of the metal-oxide-semiconductor of detection pipe of synchronous rectifier
Example is N：1, the current ratio for flowing through synchronous rectifier with detection pipe is N：1, then the resistance value of the dead resistance of each metal-oxide-semiconductor with
The resistance proportion of the dead resistance of detection pipe isSo as to ensure the dead resistance two ends pressure drop of synchronous rectifier with inspection
The dead resistance two ends pressure drop of test tube is equal.
Preferably, quantity N of the synchronous rectifier, if the maximum current that single MOS transistor device is allowed to flow through is A millis
Peace, and synchronous rectifier the operating current that passes through is needed in switching process is B amperes, then N values are 1000B:A, i.e.,
Preferably, the unlatching step of described synchronous rectification control method, by the open-minded of the parasitic diode of detection pipe
Threshold value and the pressure drop at dead resistance two ends, form the drain voltage VDS2 of synchronous rectifier and the first unlatching threshold value of open circuit
The relative pressure of Vton1, is applied to the front end of open circuit, to lift the absolute of the first unlatching threshold value Vton1 of open circuit
It is worth to second and opens threshold value Vton2, so that it is guaranteed that synchronous rectifier is not by false triggering；Threshold value Vton1 is opened with inspection by first
Open threshold value and the dead resistance two ends pressure drop sum of the parasitic diode of test tube is generated and can be changed with operating frequency etc. and automatic
The second unlatching threshold value Vton2 for adjusting.
Compared with prior art, this utility model has the advantages that：In in synchronous commutating control circuit 2
Synchronous rectifier is put, synchronous rectifier is formed by several metal-oxide-semiconductors are integrated, built-in synchronous rectifier and detection pipe are metal-oxide-semiconductor collection
It is N into number ratio:1 same type device, in chip internal, the specifications parameter of same type device has higher consistent
Property, thus, the different same type device of number has high matching, i.e., with the change of environment, temperature etc., each device
Parameters variation is consistent.Each metal-oxide-semiconductor of built-in synchronous rectifier M22 and the electric current of detection pipe M23 are flow through with environment, temperature etc.
Change it is consistent, and maintain current ratio to be N:1；The resistance value of the dead resistance of each metal-oxide-semiconductor of synchronous rectifier and detection
The resistance value of the dead resistance of pipe is consistent with the change of environment, temperature etc., and maintenance resistance ratio is Therefore synchronous rectifier
The dead resistance both end voltage drop of dead resistance both end voltage and detection pipe do not change with the change of environment, temperature etc., begin
Keep eventually equal；The parasitic body diode of built-in synchronous rectifier opens threshold value with ring with the parasitic body diode of detection pipe
Border, temperature change are consistent.Therefore, detection pipe is higher with the matching degree of built-in synchronous rectifier.At high temperature, power-supply system is opened
Beginning rectification and built-in synchronous rectifier is not temporarily opened, parasitic diode rectification of the power-supply system by built-in synchronous rectifier,
Dead resistance two ends of the absolute value of VDS2 pin voltages for the unlatching threshold value and detection pipe of the parasitic diode of synchronous rectifier
Pressure drop sum, the drain electrode of the parasitic diode of detection pipe are connected to VDS2 pins, and parasitic diode is also switched on, the parasitism of detection pipe
The pressure drop of resistance two ends is equal with the dead resistance both end voltage of built-in synchronous rectifier, and the absolute value of the voltage of VDS2 pins reaches
The absolute value of unlatching threshold value Vton2 that synchronous rectifier open circuit is arranged, synchronous rectifier open circuit is produced opens built-in
The signal of synchronous rectifier, is processed in the signal input synchronous rectification logic circuit, and the output of synchronous rectification logic circuit is opened
Signal is opened to drive circuit to drive built-in synchronous rectifier to open, power-supply system can also be realized synchronous rectification at high temperature, carry
Power-supply system efficiency is risen, is solved in existing scheme 1 shown in Fig. 1 in the case of a high temperature, external synchronous rectifier M12 cannot be opened
The problem for causing power-supply system efficiency to substantially reduce to realize synchronous rectification.
After built-in synchronous rectifier is opened, as VDS2 pin voltages are higher than the unlatching threshold of synchronous rectifier open circuit
Value Vton2, the parasitic diode of detection pipe are closed, dead resistance two ends absence of voltage.Detection pipe is only low in VDS2 pin voltages
Start working after unlatching threshold value Vton2 of synchronous rectifier open circuit, quit work after built-in synchronous rectifier is opened.
That is t in Fig. 4DON2Time period.
Description of the drawings
Fig. 1 is the schematic block circuit diagram of the existing synchronous commutating control circuit for being typically applied to inverse-excitation type switch power-supply；
Sequential charts of the Fig. 2 for existing synchronous commutating control circuit shown in Fig. 1；
Fig. 3 is the schematic block circuit diagram that this utility model synchronous commutating control circuit is applied to inverse-excitation type switch power-supply；
Fig. 4 is the sequential chart that this utility model synchronous commutating control circuit is applied to inverse-excitation type switch power-supply.
Specific embodiment
In order to more fully understand this utility model relative to the improvement done by prior art, to tool of the present utility model
Before body embodiment is described in detail, accompanying drawing is combined to the prior art that background section is previously mentioned first and is illustrated,
And then draw the inventive concept of this case.
Circuit shown in Fig. 2 is the synchronous commutating control circuit of prior art, after external synchronous rectifier M12 shut-offs
The signal of synchronous rectification logic circuit 1 must be shielded in the toff times, it is to avoid external synchronous rectifier M12 is opened by mistake and opened.But toff
Persistent period have certain limitations, the synchronous rectification efficiency of frequency-converting power supply if toff set of time is long, may be affected.
And if toff signals produce circuit using independent toff, the toff signals of setting are adjusted by the outer meeting resistance set up,
Then when load, operating frequency change, the toff signals of adjusted setting, it is impossible to follow the change of operating frequency to carry out adjust automatically
The generation cycle of toff signals, the then shielding action of toff signals cannot meet design requirement.
In view of the deficiency of existing synchronous commutating control circuit, this utility model is finding what temperature was brought to circuit control
The constraint of the type selecting of off the beaten track metal-oxide-semiconductor discrete component after a series of harmful effects, is attempted, synchronous rectifier is put
Enter in control circuit as an entirety, it is with systemic Optimal improvements thinking, dexterously whole to realize with reference to integrated circuit technique
The circuit structure design of body, solves the bad problem of hot operation of synchronous rectifier so as to essence.
On the basis of the total inventive concept of here, some optimizations are also further made, such as by the quantity of integrated device
With being able to ingeniously and simply realize the parameter matched design of integrated circuit.
More attempt making improvements the producing method of toff signals, automatically formed with the threshold value matching by metal-oxide-semiconductor
With respect to voltage reference signal, the absolute voltage reference signal of the existing fixation formed by resistance is substituted.Will synchronous rectifier
The turn-on threshold voltage of open circuit 1 is adjusted to Vton2 by Vton1, while guaranteeing external synchronous rectifier M12 when not opening
Drain terminal voltage VDS1 less than synchronous rectifier open circuit 1 threshold value Vton2, external synchronous rectifier M12 leaks after shut-off
Terminal voltage VDS1 is above Vton2, will not so trigger synchronous rectifier open circuit 1 and produce synchronous rectifier open signal.
Therefore, it is no longer necessary to toff signals, TOFF is can remove in synchronous commutating control circuit 1 and produces circuit, in the power supply system need not
Using RTOFF resistance, and can ensure that and efficient synchronous rectification can be kept under different loads, different operating frequency.
By this series of Curve guide impeller, it is ensured that being remained to using the power-supply system during improvement project at high temperature can
Synchronous rectification is realized by ground, and power-supply system efficiency under high temperature can be lifted.
In order that the purpose of this utility model, technical scheme and advantage become more apparent, below in conjunction with accompanying drawing and enforcement
Example, further describes to this utility model.It should be appreciated that specific embodiment described herein is only to explain this reality
With new, it is not used to limit this utility model.
Embodiment one
As shown in figure 3, the basic functional principle of the present embodiment：Comprising input power VIN2, the transformator that the turn ratio is N2
T21, primary side winding P21, vice-side winding S21, primary-side-control circuit 2, power tube M21, the parasitic diode D21 of power tube M21
With dead resistance R21, sampling resistor R2cs, the 3rd power supply ground GND2, output capacitance C21, load resistance RL2, output voltage
VO2, the 4th power supply ground VSS2, synchronous commutating control circuit 2.
Synchronous commutating control circuit 2 includes：Internal electric source produces circuit 2, synchronous rectifier open circuit 2, synchronous rectification
Pipe breaking circuit 2, synchronous rectification logic 2, synchronous rectification driving circuit 2, built-in synchronous rectifier M22 and detection pipe M23, it is synchronous
Rectifier control circuit also leads to VDS2 pins, VS pins, TON2 pins, VDD2 pins and VEE2 pins.Built-in synchronous rectification
Pipe M22 has parasitic diode D22 and dead resistance R22；Detection pipe M23 has parasitic diode D23 and dead resistance R23.
Internal electric source produces circuit 2 and is connected to output voltage VO 2 by VDD2 pins, produces voltage source VCC2, wherein
VCC2 is the 4th power supply ground to each module for power supply in synchronous commutating control circuit 2, the reference ground of synchronous commutating control circuit 2
VSS2。
The turn-on threshold voltage that synchronous rectifier open circuit 2 is arranged is Vton2, and the absolute value of voltage of Vton2 is unlatching
The absolute value of turn-on threshold voltage Vton1 of circuit 2 plus detection pipe M23 parasitic diode D23 open threshold value and parasitism electricity
Resistance R23 two ends pressure drops, detection pipe M23 by the absolute value of the unlatching threshold value of synchronous rectifier open circuit 2 by Vton1 absolute value
It is promoted to the absolute value of Vton2.That is the effect of detection pipe M23 is：Threshold value will be opened Vton2 is promoted to by Vton1, while guaranteeing
Threshold values Vton2 of drain terminal voltage VDS2s of the built-in synchronous rectifier M22 when not opening less than synchronous rectifier open circuit 1,
Drain terminal voltage VDS2 is above Vton2 to built-in synchronous rectifier M22 after shut-off, will not so trigger synchronous rectifier and open electricity
Road 1 produces synchronous rectifier open signal.Therefore, it is no longer necessary to toff signals, TOFF is can remove in synchronous commutating control circuit 2
Circuit is produced, RTOFF resistance need not be adopted in the power supply system, it is ensured that can keep under different loads, different operating frequency
Efficient synchronous rectification.Voltage of the synchronous rectifier open circuit 2 by detection VDS2 pins, with turn-on threshold voltage Vton2
The signal for opening built-in synchronous rectifier M22 is produced more afterwards, and the persistent period of the signal is ton2, within the time period, really
Protect built-in synchronous rectifier M22 persistently to open.Synchronous rectifier open circuit 2 is connected to resistance RTON2's by TON2 pins
One end, the other end of RTON2 are connected to the 4th power supply ground VSS2, adjust resistance RTON2 scalable ton2.
Synchronous rectifier breaking circuit 2, it is Vtoff2 directly to arrange shut-off threshold voltage, and will detect the electricity of VDS2 pins
Pressure, compares the signal for producing the built-in synchronous rectifier M22 of shut-off afterwards with shut-off threshold voltage vt off2.The voltage of VDS2 pins is
The drain voltage of built-in synchronous rectifier M22.
Synchronous rectification logic 2 processes the signal of synchronous rectifier open circuit 2 and the input of synchronous rectifier breaking circuit 2.
Synchronous rectification driving circuit 2 drives built-in synchronous rectifier M22.
As the maximum current that the single MOS transistor device of chip internal is allowed to flow through is both needed to follow the requirement of its characterisitic parameter,
Assume that the maximum current that single MOS transistor device is allowed to flow through is A milliamperes, and built-in synchronous rectifier M22 is needed in switching process
The operating current for passing through is B amperes, therefore built-in synchronous rectifier M22 just need to can be born by the way of the parallel connection of N number of MOS transistor device
The operating current of ampere level, number N of built-in synchronous rectifier M22 are needed according to the decision of the peak point current of power-supply system rectification, N
Value is 1000B:A, i.e.,If the number of detection pipe M23 is 1 (if the number of increase detection pipe M23, can increase core
The power consumption of piece), built-in synchronous rectifier M22 adopts integrated metal-oxide-semiconductor number ratio for N with detection pipe M23:1 same type device,
The current ratio for flowing through built-in synchronous rectifier M22 with detection pipe M23 is N:1, then each metal-oxide-semiconductor in synchronous rectifier M22
The resistance value of dead resistance with the resistance proportion of dead resistance R23 of detection pipe M23 isTherefore synchronous rectifier M22
Dead resistance R22 both end voltage is equal with the dead resistance R23 both end voltage of detection pipe M23 drop.In chip internal, same type
The concordance of device its specifications parameter is higher, therefore the different same type device of number has high matching, i.e., with environment,
The change of temperature etc., the parameters change of device are consistent.The electric current of built-in synchronous rectifier M22 and detection pipe M23 is flow through
As the change of environment, temperature etc. is consistent, and current ratio is maintained to be N:1；The resistance value and dead resistance of dead resistance R22
The resistance value of R23 is consistent with the change of environment, temperature etc., and maintenance ratio isTherefore dead resistance R22 both end voltage with
Dead resistance R23 both end voltage drop does not change with the change of environment, temperature etc., remains equal；Built-in synchronous rectifier
Parasitic body diode D22 of M22 opens threshold value with environment, temperature change one with parasitic body diode D23 of detection pipe M23
Cause.
Therefore, detection pipe M23 is higher with the matching degree of built-in synchronous rectifier M22.At high temperature, power-supply system starts
Rectification and built-in synchronous rectifier M22 is not temporarily opened, parasitic diode D22 of the power-supply system by built-in synchronous rectifier M22
Rectification, the absolute value of VDS2 pin voltages are the unlatching threshold value and dead resistance of the parasitic diode D22 of synchronous rectifier M22
R22 two ends pressure drop sum, the drain electrode of the parasitic diode D23 of detection pipe M23 are connected to VDS2 pins, parasitic diode D23
Conducting, the dead resistance R22 both end voltage phase of the dead resistance R23 two ends pressure drop of detection pipe M23 and built-in synchronous rectifier M22
Deng, the absolute value of the voltage of VDS2 pins reaches the absolute value of unlatching threshold value Vton2 of the setting of synchronous rectifier open circuit 2,
Synchronous rectifier open circuit 2 produces the signal for opening built-in synchronous rectifier M22, the signal input synchronous rectification logic circuit
Processed in 2, synchronous rectification logic circuit 2 exports open signal to drive circuit 2 to drive built-in synchronous rectifier M22 to open
Open, power-supply system can also realize synchronous rectification at high temperature, lift power-supply system efficiency, solve in existing scheme 1 shown in Fig. 1
In the case of a high temperature, external synchronous rectifier M12 cannot be opened to realize synchronous rectification and be caused power-supply system efficiency to drop significantly
Low problem.
After built-in synchronous rectifier M22 is opened, due to VDS2 pin voltages opening higher than synchronous rectifier open circuit 2
Threshold value Vton2 is opened, the parasitic diode D23 of detection pipe M23 is closed, dead resistance R23 two ends absence of voltage.Detection pipe M23 is only
Start working after unlatching threshold value Vton2 of the VDS2 pin voltages less than synchronous rectifier open circuit 2, in built-in synchronous rectification
Pipe M22 quits work after opening.That is t in Fig. 4DON2Time period.
The input of synchronous rectifier breaking circuit 2, the drain electrode of built-in synchronous rectifier M22, the drain electrode of detection pipe M23,
One end of dead resistance R22 of built-in synchronous rectifier M22, one end of dead resistance R23 of detection pipe M23 are connected to VDS2
Pin, the output of synchronous rectifier breaking circuit 2 are connected to an input of synchronous rectification logic 2, built-in synchronous rectifier
The source electrode and substrate of M22, that the anode of the parasitic diode D22 of built-in synchronous rectifier M22 is connected to the 4th by VS pins is electric
Source ground VSS2, the negative electrode of the parasitic diode D22 of built-in synchronous rectifier M22 are connected to the parasitism of built-in synchronous rectifier M22
The other end of resistance R22, the source electrode and substrate of detection pipe M23, the anode of the parasitic diode D23 of detection pipe M23 are connected to
One input of step rectifier tube open circuit 2, in the negative electrode of the parasitic diode D23 of built-in synchronous rectifier M23 is connected to
The other end of dead resistance R22 of synchronous rectifier M22 is put, another input of synchronous rectifier open circuit 2 passes through
TON2 pins are connected to one end of resistance RTON2, and the other end of resistance RTON2 is connected to the 4th power supply ground VSS2, synchronous rectification
The outfan of pipe open circuit 2 is connected to another input of synchronous rectification logic 2, and the outfan of synchronous rectification logic 2 connects
The input of synchronous rectification driving circuit 2 is connected to, the outfan of synchronous rectification driving circuit 2 is connected to built-in synchronous rectifier
The grid of M22, internal electric source produce the input of circuit 2 and are connected to output voltage VO 2 by VDD2 pins, detection pipe M23
Grid is connected to the 4th power supply ground VSS2 by VEE2 pins.
VIN2 is input power, is connected to one end of transformator T21 primary side windings P21, and the other end of primary side winding P21 connects
Be connected to one end of the drain electrode of power tube M21 and dead resistance R21 of power tube M21, dead resistance R21 of power tube M21 it is another
One end is connected to the negative electrode of the parasitic diode D21 of power tube M21, and the source electrode of power tube M21 is connected to current sense resistor
One end of R2cs, one end of primary-side-control circuit 2, the substrate of power tube M21, the sun of the parasitic diode D21 of power tube M21
Pole, the output of primary-side-control circuit 2 are connected to the grid of power tube M21, and the other end of current sense resistor R2cs is connected to
Three power supplys ground GND2.
One end of transformator T21 vice-side winding S21 be connected to one end of output capacitance C21, one end of load resistance RL2,
The VDD2 pins of output voltage VO 2 and synchronous commutating control circuit 2, one end of resistance RTON2 are connected to synchronous rectification control electricity
The RTON2 pins on road 2, resistance RTON2, output capacitance C21, the other end of load resistance RL2 are connected to the 4th power supply ground
The other end of the vice-side winding S21 of VSS2, transformator T21 is connected to the VDS2 pins of synchronous commutating control circuit 2, VS pins,
VEE2 pins are connected to the 4th power supply ground VSS2.
When 2 driving power pipe M21 of primary-side-control circuit is turned on, transformator T21 starts storage energy, sampling resistor R2cs
The terminal voltage being connected with power tube M21 sources is begun to ramp up, and the external synchronous rectifier M22 of secondary is off state, by defeated
Go out electric capacity C21 to power for load resistance RL2.When the terminal voltage that sampling resistor R2cs is connected with power tube M21 sources exceedes original
After given threshold in side control circuit 2,2 driving power pipe M21 of primary-side-control circuit shut-offs, the drain electrode of built-in rectifier tube M22
Turn-on threshold voltages Vton2 of the voltage VDS2 less than synchronous rectifier open circuit 2, produces the signal for opening synchronous rectifier,
Built-in rectifier tube M22 conductings are driven by synchronous rectification driving circuit 2, the energy stored in transformator T21 is by external rectifier tube
M22 is transferred in output capacitance C21 and load resistance RL2.
As shown in figure 4, in cycle t21, the drain voltage waveform of built-in synchronous rectifier M22 is VDS2 pin waveforms.
Before rectification is started, the source potential of detection pipe M23 is limited in the 4th power supply ground VSS2, inspection by synchronous rectifier open circuit 2
The grid potential of test tube M23 is also the 4th power supply ground VSS2, and built-in synchronous rectifier M22 is not yet open-minded, its source potential, grid
Voltage is similarly the 4th power supply ground VSS2.Now, built-in synchronous rectifier M22 is consistent with detection pipe M23 working condition, is in
Off state.After power-supply system starts rectification, built-in synchronous rectifier M22 is closed, by built-in synchronous rectifier M22
Parasitic body diode D22 carry out rectification, there is conduction voltage drop in parasitic body diode D22, electric current also can through dead resistance R22
Pressure drop is produced, built-in synchronous rectifier M22 and detection pipe M23 are that number ratio is N:1 same type device, and it is now built-in
The grid of synchronous rectifier M22 and detection pipe M23 is the 4th power supply ground VSS2, the parasitic body of detection pipe M23 with source potential
Diode D23 is also switched on, and flows through the parasitic diode D22 of built-in synchronous rectifier M22 and the parasitic diode of detection pipe M23
The current ratio of D23 is N:1, as the resistance proportion of dead resistance R22 and dead resistance R23 isTherefore dead resistance
R22 and the pressure drop of dead resistance R23 two ends are equal.Now, unlatching threshold of the VDS2 pin voltages less than synchronous rectifier open circuit 2
Threshold voltage Vton2, triggering synchronous rectifier open circuit 2, the generations persistent period is ton2 signals, and the voltage of ton2 signals is by the
Four power supplys ground VSS2 saltus steps to VCC2, through synchronous rectification logic 2, the driving time delay t of synchronous rectification driving circuit 2DON2Afterwards, it is interior
The rising of synchronous rectifier M22 grid voltages is put, built-in synchronous rectifier M22 is opened.
Due to the presence of various dead resistances, parasitic capacitance, stray inductance in power system circuit, cause the voltage of VDS2
Vibration is produced after built-in synchronous rectifier M22 is opened, the voltage of VDS2 may trigger the threshold of synchronous rectifier breaking circuit 2
Threshold voltage Vtoff2 and produce synchronous rectifier cut-off signals, by making after synchronous rectification logic 2, synchronous rectification driving circuit 2
Built-in synchronous rectifier M22 grid voltages drop to the 4th power supply ground VSS2 and close built-in synchronous rectifier M22, in avoiding
Put after synchronous rectifier M22 is opened and turned off due to the oscillating voltage of VDS2, synchronous rectifier open circuit 2 arranges the persistent period
For the signal of ton2, synchronous rectifier breaking circuit 2 is shielded in synchronous rectification logic 2 and opened in built-in synchronous rectifier M22
The cut-off signals for producing afterwards.Therefore, need to be according to different electrical power system call interception ton2, it is ensured that built-in synchronous rectifier M22 is just normally opened
Open.
After synchronous rectifier M22 is reliably opened, the voltage of VDS2 begins to ramp up, when the voltage of VDS2 reaches synchronous rectifier
After the threshold voltage vt off2 of breaking circuit 2, synchronous rectifier cut-off signals input synchronous rectification logic 2, synchronous rectification are produced
2 output synchronous rectifier cut-off signals of logic make the grid voltage of built-in synchronous rectifier M22 to synchronous rectification driving circuit 2
Drop to the 4th power supply ground VSS2 and close built-in synchronous rectifier M22, hereafter, power-supply system relies on built-in synchronous rectifier
The parasitic diode D22 of M22 continues rectification, and the voltage of VDS2 declines immediately, and the voltage remains above synchronous rectifier open circuit 2
Threshold value Vton2 without produce open synchronous rectifier signal, therefore, built-in synchronous rectifier M22 will not be opened again
Open.
Additionally, after rectification terminates, as the parasitic capacitance and vice-side winding S21 of built-in synchronous rectifier M22 drain terminals are deposited
Start vibration in the voltage of, VDS2, the voltage of VDS2 is above the threshold value of synchronous rectifier open circuit 2 in resonance time
Vton2 opens the signal of synchronous rectifier without producing, and built-in synchronous rectifier M22 is remained turned off.In system
After frequency upgrading, due to the presence for not having toff signals, in Fig. 4 in t22 the and t23 cycles, synchronous rectification still can normal work.
Parasitic body diode D22 of built-in synchronous rectifier M22 is open-minded with parasitic body diode D23 of detection pipe M23
Threshold value is varied with temperature unanimously, and built-in synchronous rectifier M22 is matched with detection pipe M23, synchronous rectifier open circuit 2 and inspection
The open signal of the synchronous rectifier that the combination of test tube M23 is produced, it is ensured that power-supply system can be realized same in the range of total temperature
Step rectification, and lift power-supply system efficiency.
Claims (8)
1. a kind of synchronous commutating control circuit, including internal electric source produces circuit, open circuit, breaking circuit, logical process electricity
Road and drive circuit, internal electric source produce circuit and produce voltage source VCC2, with to each modular circuit in synchronous commutating control circuit
Power supply；Open circuit arrange first open threshold value, and produce the unlatching clock signal of synchronous rectifier export electricity to logical process
Road；Breaking circuit arranges shut-off threshold value, and produces the shut-off clock signal of synchronous rectifier and export to logic processing circuit；Logic
Process circuit receives the clock signal of open circuit and breaking circuit output, and is processed as control signal and exports to drive circuit；
Drive circuit drives synchronous rectifier, it is characterised in that：
The synchronous rectifier controlled by synchronous commutating control circuit, is built in synchronous commutating control circuit；
Synchronous commutating control circuit, also including detection pipe, synchronous rectifier and detection pipe are same type device, with identical
Temperature characterisitic；Detection pipe is connected between the drain electrode of synchronous rectifier and open circuit.
2. synchronous commutating control circuit according to claim 1, it is characterised in that：The synchronous rectifier and detection pipe are equal
For integrated chip structure, it is integrated on the same chip.
3. synchronous commutating control circuit according to claim 2, it is characterised in that：The synchronous rectifier is by several
Metal-oxide-semiconductor is integrated to be formed, and several metal-oxide-semiconductors of synchronous rectifier are N with the integrated quantitative proportion of metal-oxide-semiconductor of detection pipe：1, flow through same
Step rectifier tube is N with the current ratio of detection pipe：1.
4. synchronous commutating control circuit according to claim 3, it is characterised in that：Quantity N of the synchronous rectifier, if
The maximum current that single MOS transistor device is allowed to flow through is A milliamperes, and synchronous rectifier needs the work electricity for passing through in switching process
Flow for B amperes, then N values are
5. synchronous commutating control circuit according to claim 1 and 2, it is characterised in that：The detection pipe, it is parasitic by which
The pressure drop for opening threshold value and dead resistance two ends of diode is applied to the front end of open circuit, to lift the first of open circuit
The absolute value for opening threshold value opens threshold value to second；Second unlatching that open circuit be set is combined by detection pipe with open circuit
Threshold value.
6. synchronous commutating control circuit according to claim 1 and 2, it is characterised in that：The breaking circuit, arranges shut-off
Threshold voltage, and after the drain voltage of the synchronous rectifier of detection is compared with shut-off threshold voltage, produce synchronous rectifier
Cut-off signals.
7. synchronous commutating control circuit according to claim 1 and 2, it is characterised in that：The synchronous commutating control circuit,
With five pins, the first pin (VDS2) is drawn by the drain electrode of synchronous rectifier and detection pipe, to transformer secondary around
Group connection；Second pin (VS) is drawn by the anode of the parasitic diode of synchronous rectifier, to be connected with power supply；3rd draws
Foot (VDD2) produces circuit by internal electric source and draws, to external output voltage VO 2；4th pin (TON2) is drawn by open circuit
Go out, to outer meeting resistance RTON2；5th pin (VEE2) is drawn by the grid of detection pipe, to be connected with power supply.
8. synchronous commutating control circuit according to claim 1 and 2, it is characterised in that：The detection pipe, its drain electrode connection
To the drain electrode of synchronous rectifier, source electrode is connected with open circuit, and grid is drawn for connecing power supply ground.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108809097A (en) * | 2017-05-02 | 2018-11-13 | 通嘉科技股份有限公司 | Synchronous rectifier and its operating method applied to power supply changeover device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108809097A (en) * | 2017-05-02 | 2018-11-13 | 通嘉科技股份有限公司 | Synchronous rectifier and its operating method applied to power supply changeover device |
| CN108809097B (en) * | 2017-05-02 | 2020-08-11 | 通嘉科技股份有限公司 | Synchronous rectifier applied to power converter and operation method thereof |
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