CN107742984A - Trough control circuit and trough control method - Google Patents
Trough control circuit and trough control method Download PDFInfo
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- CN107742984A CN107742984A CN201710899127.5A CN201710899127A CN107742984A CN 107742984 A CN107742984 A CN 107742984A CN 201710899127 A CN201710899127 A CN 201710899127A CN 107742984 A CN107742984 A CN 107742984A
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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
- H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—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 with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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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
The invention provides one kind can widen input voltage range, and not cause the trough control method and trough control circuit of trough switching concussion.Wherein, trough control circuit, including current detection circuit, secondary side feedback circuit and driving output circuit, current detection circuit is used for the primary side peak point current of the source electrode of detection switch pipe, with the service time of controlling switch pipe；Secondary side feedback circuit is used for the voltage signal of the reflection load of receiving voltage sampling isolation feedback circuit feedback；Output circuit is driven to be used for switching tube output drive signal；Also include input voltage detection circuit and waveform detection circuit, input voltage detection circuit, for detecting the input voltage of anti exciting converter, so that trough control circuit judges that switching tube switch periods are open-minded in which trough according to the gear of input voltage；Waveform detection circuit, for the waveform of sampling switch pipe drain electrode, and trough quantity is counted.
Description
Technical field
The present invention relates to switch converters field, the anti exciting converter being operated under discontinuous mode should especially for DCDC
With the trough control method and trough control circuit of the anti exciting converter of occasion.
Background technology
With the development of science and technology, electrical equipment, instrument, electronic product are more and more, it is also more next to the demand of Switching Power Supply
It is bigger, the appearance of some portable type electronic products, it is continuously increased the Switching Power Supply demand of micropower section.
The main still circuit of reversed excitation of Switching Power Supply scheme used at present in micropower section, because it has, cost is low, electricity
Road is simple and reliable, using a series of features such as maturation.The mode of operation of circuit of reversed excitation is divided into two kinds, and one kind is continuous mode
(CCM), one kind is discontinuous mode (DCM).Continuous mode typically can be used in relatively high power section, because under this mode of operation
Peak point current can be smaller, makes current effective value smaller, bigger in the ratio shared by large-power occasions conduction loss, so energy
The reduction loss that current effective value can be more considerable is enough reduced, reaches preferable efficiency.But in this operating mode, have very
More shortcomings, as turn-on consumption is big, secondary commutation diode reverse recovery current is big, synchronous rectification bad the problems such as doing.In micro- work(
Rate occasion, electric current itself is smaller, so the ratio shared by conduction loss is smaller, circuit of reversed excitation is continued to operate in continuous mode
Benefit is with regard to unobvious, so selecting discontinuous operating mode under many occasions.Under discontinuous mode, the turning-on voltage of metal-oxide-semiconductor is relative
Relatively low, EMI is good, and secondary commutation diode does not have the loss of Reverse recovery and voltage stress problem, and synchronous rectification detection is easily done,
Loop is easy to compensate for, and has many advantages.In order to force down this advantage using electric conduction to greatest extent, prior art has had
The circuit of metal-oxide-semiconductor drain voltage resonance under many detection discontinuous modes, making it is opened at trough each time, reaches minimum
Turning-on voltage, minimize turn-on consumption, EMI noise minimize.For resonance electricity in the circuit that occurs with voltage resonance
Pressure is referred to as trough when reach minimum, trough control be detect and determine trough exact time and according to circuit most
Beneficial condition selects some trough and then switch tube open a kind of switch controlled scheme of action, the controlling party
Under case except can realize it is above-mentioned reduction main switch turning-on voltage reduce turn-on consumption, EMI noise minimize with
Outside, can be with Optimization Work frequency range, reasonably controlling switch is lost and simplifies EMI circuit designs.
The switching tube drive control scheme of anti exciting converter traditional in industry is such at present：Its circuit diagram is such as
Shown in Fig. 1, anti exciting converter includes transformer T1, primary circuit, secondary circuit and control circuit, and primary circuit includes filtered electrical
Hold C1, main power circuit, clamp circuit and current sampling circuit, main power circuit by transformer T1 primary side winding and main switch
Pipe TR1 is formed by connecting (main switch is metal-oxide-semiconductor, below alternatively referred to as metal-oxide-semiconductor TR1)；Clamper module by resistance R1, electric capacity C2 and
Diode D2 is formed by connecting；Current sampling circuit is formed by connecting by resistance R4.Vice-side winding of the secondary circuit including transformer T1,
Commutation diode D1 and electric capacity C3.Control circuit is by control chip (or being control IC) U10 and voltage sample isolation feedback electricity
Road is formed, and control chip U10 is used for the drive control for realizing switching tube, including GND pin, CS pins, FB pins and GATE draw
Pin, GND pin are the reference ground pin of chip；CS pins are current detecting pin, for detecting primary side peak current level, are entered
Row metal-oxide-semiconductor TR1 duty cycle adjustment, to control metal-oxide-semiconductor TR1 ON time；FB pins are feedback pin, for receiving secondary
Feedback signal carries out Duty ratio control for control chip；GATE pins are to drive output pin, output drive signal to outside
Metal-oxide-semiconductor TR1 grid.The specific annexation of anti exciting converter is the one of resistance R1 in input VIN+ connection clamper modules
End and electric capacity C2 one end, the resistance R1 other end are connected with the electric capacity C2 other end and connect diode D2 negative electrode, and two
The Same Name of Ends of pole pipe D2 anode connection transformer T1 primary side windings, the different name end connection input voltage of transformer T1 primary side windings
VIN+；The Same Name of Ends of metal-oxide-semiconductor TR1 drain electrode connection transformer T1 primary side windings, metal-oxide-semiconductor TR1 source electrode connect in main loop of power circuit
The resistance R4 of current sampling circuit one end is connect, while connects control chip U10 CS pins；Resistance R4 other end ground connection；
Metal-oxide-semiconductor TR1 grid connection control chip U10 GATE pins, control chip U10 GND pin connection reference ground GND ends.
Commutation diode D1 anode, transformer T1 secondary in the Same Name of Ends connection output rectification filter loop of transformer T1 vice-side windings
Winding different name end connects negative pole of output end Vo-, commutation diode D1 negative electrode connection output head anode Vo+, while connects output
Filter capacitor C3 positive pole, the negative pole Vo- of output filter capacitor C3 negative pole connection output end.Voltage sample isolation feedback circuit
Two inputs connect the positive pole Vo+ and negative pole Vo- of output end, the output end connection control of voltage sample isolation feedback circuit respectively
Coremaking piece U10 FB pins.
It (i.e. feedback voltage, is that secondary is anti-that general control chip U10, which has a signal FB voltage related to load,
It is fed back to the voltage of control chip U10 FB pins), load is bigger, then FB voltages are higher, and FB voltages are set several gears, false
Provided with 4 gears, when FB pin voltages are before the first gear, i.e. FB voltages are relatively low, when loading less, trough do not entered
Row control, no trough open function, and system is in the mode of operation of a frequency reducing, and working frequency drops with the reduction of load
It is low.It is open-minded after 4 troughs of rolling counters forward when FB voltages reach the first gear between the second gear；When FB electricity
It is open-minded after 3 troughs of rolling counters forward when pressure reaches the second gear between third gear；When FB voltages reach the 3rd
It is open-minded after 2 troughs of rolling counters forward when between gear and fourth speed position；When FB voltages reach more than fourth speed position
When, system will be operated in critical conduction mode, and metal-oxide-semiconductor is opened in first trough.Gear is higher, and just representative load is bigger, is fully loaded with
It is in more than fourth speed position, trough quantity minimize.In switching tube Duty ratio control, the switch periods of switching tube
It is made up of ON time, erasing time and trough resonance time, wherein trough resonance refers to flyback transformation under DCM (interrupted) pattern
The resonance of device primary side winding and switch junction capacitance.When trough quantity is reduced, resonance time shortens, the working frequency of switching tube
Improve.In traditional scheme it is constant in output end load and with heavy duty in the case of input terminal voltage VIN+ and switching frequency f
Relation curve is as shown in Fig. 2 working frequency and the input voltage of switching tube are in approximately linear proportional relationship, the change of working frequency
It is big to change scope, and the more high then working frequency of input voltage is higher.Because FB feedback voltages are substantially in the case where load is certain
Constant, hereinafter there is narration the reason for FB voltages are constant, therefore can select to open switching tube in a fixed trough, with
Input terminal voltage VIN+ rise, it is assumed that switching frequency does not raise also, exports energy and efficiency is constant, so peak point current
It is constant, according to the excitatory formula of inductanceUnderstanding the service time of switching tube can be reduced, erasing time and resonance time
It is constant, then work period reduction, frequency increase, while as the increase of frequency is according to formula Pin=1/2*L*Ipk2* f can be led
Peak point current is caused further to reduce so working frequency is further up.
Fig. 3 be Traditional control chip trough control program under the graph of a relation of output loading and working frequency, it is also corresponding
Switch transistor T R1 drain electrode resonance trough number relation.When FB voltages corresponding to load are before gear 1, because not entering traveling wave
Paddy controls, so being operated in frequency redution mode, frequency reduces with the reduction of load.When FB voltages reach gear corresponding to load
When 1, controlling switch pipe TR1 is open-minded in the 4th trough, and general resonance trough quantity is more than 4 before this, so trough
One-shot change can occur for resonance quantity, cause resonance time to reduce, so as to cause switch periods suddenly change to cause
The unexpected increase of frequency, because resonance time reduces, continue increase load because trough number is constant, load increase is so peak value
Electric current needs to increase, therefore switch transistor T R1 ON time increase, erasing time increase, so frequency slowly reduces.Work as load
After corresponding FB voltages reach gear 2, controlling switch pipe TR1 is open-minded in the 3rd trough, same because have switched a trough,
Harmonic period has lacked one, and so switching frequency can produce once unexpected rise, increase then as load slowly reduces again,
The like, critical conduction mode is just finally always worked at after FB voltages corresponding to load exceed gear 4, is opened in the first trough
It is logical.Traditional scheme reasonably compared with frequency reducing is realized under low-load, improves the efficiency of underloading, while realized under heavier load
Trough control is opened, and reaches the effect of minimum voltage conducting.
But the trough control program of Traditional control chip have two it is serious the defects of, first, present Switching Power Supply is general
All it is that requirement has wider input voltage range, in this case in order to ensure whole voltage range load overcurrent point
Uniformity, typically can all increase the function of feedforward, same load, FB pin voltages difference under conditions of no feedforward itself
Just little (high pressure is lower slightly), after adding feed forward function now, FB pin voltages are several corresponding to same load under high-low pressure
The same, so for same load no matter input voltage is how many, FB voltages are consistent.That is, under low pressure
FB pin voltages can enter fourth speed position, be operated in critical conduction mode, then FB pin voltages equally can also enter the under high pressure
Four gears, are operated in critical conduction mode.Assuming that (the first input is 100VDC-400VDC to two kinds of common model machines, and reflected voltage is
100V, second of input is 9VDC-36VDC, reflected voltage 10VDC), when ignoring that sub-fraction of resonance in critical conduction mode
Between, according to formula Vin*D=Voff* (1-D), L*Ipk=Vin*D*T, Pin=1/2*L*Ipk2* f, it is assumed that under high-low pressure
Efficiency is the same, then can show that the working frequency of the first model machine under high pressure is 2.56 times under low pressure, second of model machine
Working frequency under high pressure is 2.73 times under low pressure, so the excursion of the switching tube working frequency of traditional scheme is very
Greatly, EMI circuits are difficult to design.And working frequency can be very high under high input voltage, cause the efficiency under high input voltage non-
It is often low, therefore the narrow application of input voltage range can only be done.
Second defect of trough control program of Traditional control chip be：When the corresponding FB voltages of load are just in gear
When neighbouring, it is assumed that FB voltages reach the second gear, then metal-oxide-semiconductor TR1 resonance trough number will be in the 4th trough and the 3rd
Constantly switch between individual trough, because that point is a critical value.Common thinking is one return difference of increase, makes critical point
Judgement it is more stable, even if but being the increase in return difference under these conditions can also cause trough to switch because working as work shape
State from the condition more than trough number enter the few state of trough number after (FB pin voltages are from low to high), the working frequency phase of switching tube
When in producing a mutation, and peak point current can not change at once, therefore according to energy theorem Pin=1/2*L*Ipk2* f can be with
Know, the energy of input can increase suddenly, then necessarily cause the rise of output voltage, and the rise of output voltage will necessarily cause
The reduction of FB pin voltages, so that more original state of trough number can be jumped back to again again.And FB pin voltages change
Amplitude be that can exceed the amplitude of return difference, basic reason is to switch trough to trigger the mutation of energy, and the mutation of energy is again
Further trigger the mutation of FB pin voltages, so as to form concussion.In the case of such concussion, output ripple can become very
Greatly, especially in DCDC application scenarios, because the conventional ripple requirement of most of product is just in 50mV or so, in output capacitance very
In the state of small, ripple reaches 100-200mV when traditional scheme trough switches, so traditional scheme is in DCDC micropowers field
It is unworkable.
The content of the invention
To solve the above problems, the invention provides one kind can widen input voltage range, and trough is not caused to be cut
Change the trough control method of concussion.
It is corresponding to this, present invention also offers input voltage range can be widened, and do not cause trough switching concussion
Trough control circuit.
For achieving the above object, the present invention provides a kind of trough control method, suitable for the main work(of anti exciting converter
The trough resonance of rate switching tube switch periods is controlled, and when feedback voltage is higher than load reference voltage, is controlled into trough
The trough quantity of pattern, i.e. controlling switch pipe switch periods changes with the change of input voltage, specifically comprises the following steps, defeated
Enter voltage detecting step, detect the input voltage signal of anti exciting converter, and switch according to the gear configuration switch pipe of input voltage
The trough quantity in cycle；Trough opens rate-determining steps, the waveform of sampling switch pipe drain electrode, and trough is counted；In trough
When quantity reaches setting value, controlling switch pipe is open-minded.
Preferably, the trough control model, the trough quantity of controlling switch pipe switch periods is with the liter of input voltage
It is high and increase.
Preferably, the trough control model, input voltage it is constant, load increase when, trough quantity is constant, only by with
The ON time and erasing time, Natural regulation switching tube for loading increased primary side peak point current increase switching tube switch periods are opened
Close that the cycle is elongated, switching tube working frequency reduces.
For product theme, the present invention provides a kind of trough control circuit, suitable for the main power to anti exciting converter
The trough resonance (resonance of flyback transformer primary side winding and switch junction capacitance i.e. under DCM patterns) of switching tube switch periods enters
Row control, including current detection circuit, secondary side feedback circuit and driving output circuit, current detection circuit are used for detection switch pipe
Source electrode primary side peak point current, with the service time of controlling switch pipe；Secondary side feedback circuit is used for receiving voltage sampling isolation
The voltage signal of the reflection load of feedback circuit feedback；Output circuit is driven to be used for switching tube output drive signal；Also
Including input voltage detection circuit and waveform detection circuit, input voltage detection circuit, for detecting the input of anti exciting converter
Voltage, so that trough control circuit judges that switching tube switch periods are open-minded in which trough according to the gear of input voltage；Waveform
Circuit is detected, for the waveform of sampling switch pipe drain electrode, and trough quantity is counted；Wherein, trough control circuit controls
The trough quantity of switching tube switch periods changes with the change of input voltage.
Preferably, the trough control circuit, in addition to bleeder circuit, bleeder circuit are connected in parallel on the input of anti exciting converter
Between anode and ground, including resistance R2, resistance R3 and electric capacity C4, resistance R2 are sequentially connected in series with resistance R3, are connected in series a formation
Dividing point, electric capacity C4 are connected in parallel on resistance R3 both ends；The input of the input voltage detection circuit and the partial pressure of bleeder circuit
Point connection.
The present invention provides a kind of trough control circuit again, suitable for the trough of the main power tube switch periods of anti exciting converter
Resonance is controlled, and is integrated chip structure, including grounding pin, secondary side feedback pin, current detecting pin and driving output
Pin, grounding pin are used to be grounded；Current detecting pin is used to be connected with the source electrode of switching tube, detects primary side peak point current, with
The service time of controlling switch pipe；Secondary side feedback pin is used to be connected with voltage sample isolation feedback circuit, receives its feedback
Reflect the voltage signal of load；Output pin is driven to be used for switching tube output drive signal；Also include input voltage to examine
Survey pin and waveforms detection pin, input voltage measurement pin, for detecting the input voltage of anti exciting converter, for trough control
Circuit processed judges that switching tube switch periods are open-minded in which trough according to the gear of input voltage；Waveforms detection pin, for adopting
The waveform of sample switching tube drain electrode, and trough quantity is counted；Wherein, trough control circuit controlling switch pipe switch periods
Trough quantity changes with the change of input voltage.
Preferably, described trough control circuit, in addition to bleeder circuit, bleeder circuit are connected in parallel on the defeated of anti exciting converter
Enter between anode and ground, including resistance R2, resistance R3 and electric capacity C4, resistance R2 are sequentially connected in series with resistance R3, are connected in series a shape
Into dividing point, electric capacity C4 is connected in parallel on resistance R3 both ends；The dividing point connection of the input voltage measurement pin and bleeder circuit.
The present invention separately provides a kind of trough control circuit again, suitable for the ripple of the main power tube switch periods of anti exciting converter
Paddy resonance is controlled, and is integrated chip structure, including grounding pin and secondary side feedback pin, and grounding pin is used to be grounded；It is secondary
Side feedback pin is used to be connected with voltage sample isolation feedback circuit, receives the voltage signal of the reflection load of its feedback；
Also include switching tube and resistance R4, and input voltage measurement pin and switching tube drain lead, switching tube and resistance R4 are integrated
In in chip；Input voltage measurement pin, for detecting the input voltage of anti exciting converter, so that trough control circuit is according to input
The gear of voltage judges that switching tube switch periods are open-minded in which trough；Switching tube drain lead, for sampling built-in switch
The waveform of pipe drain electrode, and trough control circuit is supplied to be counted to trough quantity；Wherein, trough control circuit control is opened
The trough quantity for closing pipe switch periods changes with the change of input voltage.
Preferably, described trough control circuit, in addition to bleeder circuit, bleeder circuit are connected in parallel on the defeated of anti exciting converter
Enter between anode and ground, including resistance R2, resistance R3 and electric capacity C4, resistance R2 are sequentially connected in series with resistance R3, are connected in series a shape
Into dividing point, electric capacity C4 is connected in parallel on resistance R3 both ends；Input voltage measurement pin and partial pressure electricity in the trough control circuit
The dividing point connection on road.
As described above, the anti exciting converter that the program is improved to obtain includes：Main power circuit, clamp circuit, output rectification
Filter circuit, input voltage sample circuit, current sampling circuit, control circuit.Described main power circuit is by transformer and master
Switching tube is formed by connecting, and described clamp circuit is formed by connecting by clamp resistance, clamp capacitor and diode, described output
Current rectifying and wave filtering circuit is formed by connecting by output commutation diode and output capacitance, and described input voltage sample circuit is by upper partial pressure
Resistance, lower divider resistance and filter capacitor are formed by connecting, and described current sampling circuit is made up of current sampling resistor, and control
Chip U1 connections, control chip U1 is input voltage measurement pin including at least UVP pins, for detecting the shelves of input voltage
Position, to judge which trough to open and do under-voltage protection at), GND pin as chip reference ground pin；CS pins are electric current
Pin is detected, metal-oxide-semiconductor TR1 duty cycle adjustment is carried out for detecting primary side peak current level, to control leading for metal-oxide-semiconductor TR1
The logical time；FB pins are feedback pin, for receiving secondary side feedback signal so that control chip carries out Duty ratio control；GATE draws
Pin is to drive output pin, grid of the output drive signal to outside metal-oxide-semiconductor TR1；VS pins are voltage sample pin, for adopting
The voltage change signal of sample switch transistor T R1 drain electrodes, judges trough, and trough quantity is counted.Described control circuit by
Control chip U1, voltage sample isolation feedback circuit are formed.
The operation principle of trough control program of the present invention：Pass through input voltage sampling circuit samples input voltage, root first
An accurate trough quantity can be determined according to different input voltages, then passes through VS pin sampling switch pipes TR1 drain electrode
Waveform, trough is sampled and makes internal trough rolling counters forward.On the other hand sentenced by feedback voltage FB pin voltages
Determine the enabled characteristic of valley detection, if FB pin voltages are higher than setting value, illustrate that load is larger, valley detection is effective, counts
The trough quantity that the trough quantity that device is accumulated to selects after being sampled with input voltage is consistent, makes driving output circuit (such as circuit
Have the pin drawn in chip exterior, then can be called driving output pin) output high level open metal-oxide-semiconductor；If FB pins are electric
Force down in setting value, then explanation load is smaller, and valley detection is invalid, in this case the signal of valley detection signal and counter
All shielded, different working frequencies is corresponded to according to FB pin voltage sizes, when cycle oscillator reaches, make driving output electricity
Road output high level opens metal-oxide-semiconductor.The shut-off of metal-oxide-semiconductor no longer illustrates as with traditional scheme being.
Compared with prior art, trough control program of the present invention has the advantages that：
(1) do not influence to enable the heavy duty efficiency of high input voltage to be lifted on the basis of light-load efficiency；
(2) keep widening converter input voltage range while efficiency；
(3) it is fully loaded with operating frequency range to greatly reduce, is advantageous to the design and optimization of EMI circuits；
(4) eliminate traditional trough and open output ripple caused by the switching of scheme lower wave trough.
Brief description of the drawings
Fig. 1 is common flyback topologies circuit theory diagrams；
Fig. 2 is the graph of a relation that traditional trough control mode is fully loaded with lower frequency and input voltage；
Fig. 3 is load and the relation of frequency and the graph of a relation of resonance trough number under traditional trough control mode；
Fig. 4 is the circuit theory diagrams of the anti exciting converter of the embodiment of the present invention one；
Fig. 5 is the principle frame inside the control chip of trough control circuit in the anti exciting converter of the embodiment of the present invention one
Figure；
Fig. 6 be the embodiment of the present invention one anti exciting converter in the input voltage of trough control circuit and the relation of frequency with
And the graph of a relation of resonance trough number；
Fig. 7 be the embodiment of the present invention one anti exciting converter in trough control circuit under same input voltage work frequency
Rate with load changing trend diagram；
Fig. 8 is the circuit theory diagrams of the anti exciting converter of the embodiment of the present invention two.
Embodiment
Embodiment one
Fig. 4 is the circuit theory diagrams of anti exciting converter of the present invention, and anti exciting converter includes transformer T1, primary circuit, pair
Side circuit and control circuit, primary circuit include filter capacitor C1, main power circuit, clamp circuit, current sampling circuit and divided
Volt circuit, main power circuit be formed by connecting by transformer T1 primary side winding and main switch TR1 (main switch is metal-oxide-semiconductor, with
Metal-oxide-semiconductor TR1 is alternatively referred to as down).Clamper module is formed by connecting by resistance R1, electric capacity C2 and diode D2.Current sampling circuit by
Resistance R4 is formed by connecting.Secondary circuit is made up of transformer T1 vice-side winding with diode D1, electric capacity C3.Control circuit is by controlling
Coremaking piece U1 and voltage sample isolation feedback circuit are formed, and control chip U1 is used for the drive control for realizing switching tube, including connects
Ground pin GND, secondary side feedback pin FB, current detecting pin CS, driving output pin GATE, input voltage measurement pin UVP
It is used to be grounded with waveforms detection pin VS, grounding pin GND；Current detecting pin CS is used to be connected with the source electrode of switching tube, examines
Survey primary side peak point current；Secondary side feedback pin FB is used to be connected with voltage sample isolation feedback circuit, receives the reflection of its feedback
The voltage signal of load；Output pin GATE is driven to be used for switching tube output drive signal；Input voltage measurement pin
UVP, for detecting the input voltage of anti exciting converter；Waveforms detection pin VS, the waveform to be drained for sampling switch pipe, and it is right
Trough quantity is counted；Wherein, the trough quantity of trough control circuit controlling switch pipe switch periods with input voltage change
Change and change.
The annexation of anti exciting converter is：Input anode VIN+ connection input filter capacitors C1 positive pole, electric capacity C1
Negative pole connection reference ground GND ends, input VIN+ is also connected with one end of upper divider resistance R2 in input voltage sample circuit, electricity
Resistance R2 other end connects lower divider resistance R3 one end and control chip U1 UVP pins respectively, while connects electric capacity C4
Positive pole, electric capacity C4 positive pole and the resistance R3 other end are connected together and to reference ground GND ends；Input VIN+ connects
Connect resistance R1 one end and electric capacity C2 one end in clamper module, the resistance R1 other end be connected with the electric capacity C2 other end and
Connect diode D2 negative electrode, the Same Name of Ends of diode D2 anode connection transformer T1 primary side windings, transformer T1 primary sides around
The different name end connection input voltage VIN of group+；Metal-oxide-semiconductor TR1 drain electrode connection transformer T1 primary side windings is same in main loop of power circuit
Name end, while control chip U1 VS pins are connected, the resistance R4 of metal-oxide-semiconductor TR1 source electrode connection current sampling circuit one end,
Control chip U1 CS pins, metal-oxide-semiconductor TR1 grid connection control chip U1 GATE pins, control chip U1 are connected simultaneously
GND pin connection reference ground GND ends, rectification two in the Same Name of Ends connection output rectification filter loop of transformer T1 vice-side windings
Pole pipe D1 anode, the connection of transformer T1 vice-side winding different names end negative pole of output end Vo-, commutation diode D1 negative electrode connection are defeated
Go out proper pole Vo+, while connect output filter capacitor C3 positive pole, the negative pole of output filter capacitor C3 negative pole connection output end
Vo-, two inputs of voltage sample isolation feedback circuit connect the positive pole Vo+ and negative pole Vo- of output end, while voltage respectively
Sample the output end connection control chip U1 of isolation feedback circuit FB pins.
The trough control principle of the switching tube switch periods of anti exciting converter of the present invention is：Pass through voltage sample isolation circuit
To output voltage sampling, isolation transmits a FB pin voltage, control chip U1 FB pins detection feedback voltage more afterwards
VFB, feedback voltage V FB are as load changes, and load is bigger, and voltage is higher, and FB pin voltages are 1.2V when unloaded, full
Carry as 4V, set trough open effectively corresponding to FB voltages as 2.5V, this value be default load reference voltage, is electric according to feeding back
Press the load voltage signal characterized, the artificial default division underloading of institute, two kinds of loading conditions of heavy duty separation magnitude of voltage.
In the present embodiment, load reference voltage Vref5 is set to 2.5V.When control chip U1 detects that FB pin voltages are below 2.5V,
It is low level that then trough, which opens enable signal, and no trough control action, FB pin voltages correspond to the vibration inside control chip U1
Device produces a working frequency, and converter can be operated under the frequency, now belong to frequency redution mode.When control chip U1 is detected
FB voltages are higher than 2.5V, then trough opens that function is effective, and input voltage gives control chip U1 after divider resistance R2, R3 partial pressure
The sampling of UVP pin, which trough gear detects corresponding to input voltage is, it is determined that control chip U1 after trough gear
VS pin detection metal-oxide-semiconductor TR1 resonance trough, when detecting that a trough is just once counted, when count number and input electricity
Trough quantity meets corresponding to trough gear corresponding to pressure, then control chip U1 GATE pins output drive signal driving MOS
Pipe TR1 is open-minded, realizes trough control.
Fig. 5 show the trough control chip U1 of specific embodiment one theory diagram, wherein including trough quantitative determination
Comparator circuit, and the detection valley detection circuit of trough, trough selector, trough counter, logic control circuit and
Oscillator.Its annexation is 4 comparators of the comparator circuit that control chip U1 UVP leg signals are connected to the inside
In comp1, comp2, comp3, comp4, and the in-phase input end of comparator is all connected to, the reverse input of 4 comparators
End connects comparison reference voltage corresponding with level Four trough gear respectively.Comparison reference voltage, it is the change model according to input voltage
Enclose, the magnitude of voltage of the separation of four trough gears of default division, in the present embodiment, comparison reference voltage Vref1,
Vref2, Vref3, Vref4 tetra-, first, second, third and fourth gear of trough gear is corresponded to respectively.The output end of 4 comparators is complete
Portion is connected to trough selector, and the output signal of trough selector is connected to logic control circuit；VS leg signals are connected to trough
Detect in circuit, the output end of valley detection circuit is connected to trough counter, counter output connection logic control circuit；
FB leg signals connection comparator comp5 normal phase input end, load reference voltage Vref5 connection comparators comp5 negative
Input, comparator comp5 output end are connected to logic control circuit；FB signals are also inputted in oscillator, oscillator
Output end be connected to logic control circuit, the output end of logic control circuit exports a drive signal to control chip U1's
GATE pins.
Trough control chip U1 concrete operating principle is：
Control source of the input voltage after resistance R2 and R3 partial pressure is sampled to UVP pin, while in UVP pin to ground
Between be connected in parallel with a capacitor C4 effectively some ripples of input can be filtered, suppress UVP pins and produce larger line
Ripple causes the problem that toggles of trough gear critical point, the voltage of UVP pins be sent to comparator comp1, comp2, comp3,
Comp4 is compared, and is the first gear corresponding to comparator comp1, is the second gear corresponding to comparator comp2 with such
Push away.Comparison reference voltage Vref1 is minimum corresponding to first gear, and comparison reference voltage Vref4 is highest, so corresponding
If input voltage be less than the first gear, anti exciting converter is in under-voltage condition and not worked.I.e. when input voltage is in ripple
Paddy, which controls, opens the lower input undervoltage protection of threshold point (it is the first gear electrical voltage point that this, which opens threshold point, in the present embodiment)
, can be with because the input voltage signal of input voltage measurement pin offer can be used directly in trough control circuit during threshold point
Under the trough control model that input voltage measurement is realized, input voltage measurement signal is directly multiplexed to realize under-voltage protection control
System, makes anti exciting converter enter under-voltage protection state.
Trough selector can select first if corresponding input voltage is between the first gear and the second gear
Trough, if corresponding input voltage is in the second gear between third gear, trough selector can select the second trough,
If corresponding input voltage is between third gear and fourth speed position, trough selector can select the 3rd trough, if
Corresponding input voltage is on fourth speed position, then trough selector can select the 4th trough.The selection letter of trough selector
Number it is input in logic control circuit, metal-oxide-semiconductor TR1 drain voltage is connect outside VS pins, drain voltage signal is input to ripple
Paddy detection circuit carries out trough judgement, decision method have it is a variety of, such as slope detection, voltage ratio compared with etc., as long as can reach herein
Detection judges trough can.A pulse signal is issued by after a trough is detected and gives trough rolling counters forward, is counted
Information transmission is to logic control circuit.
On the one hand feedback voltage signal FB voltages are input to comparator comp5 positive input, be on the other hand input to
In oscillator, when FB voltages are less than load reference voltage Vref5, illustrate that load is smaller, comparator output terminal is defeated
Go out low level, the signal is input in logic control circuit, and oscillator produces a frequency also according to FB voltage swings, now
Logic control circuit can shield the signal of trough selector and the signal of trough counter, directly according to the concussion cycle of oscillator
One drive signal control anti exciting converter of output is operated in frequency redution mode, the function that no trough is opened.When FB voltages are higher than
When load reference voltage Vref5, illustrate that load is bigger, load be more than trough control unlatching it is enabled corresponding to load
When, comparator comp5 output ends output high level, the signal is input in logic control circuit, and now logic control circuit is being just
Often receive the signal of trough selector and the signal of trough counter.Trough selector determines which trough to open MOS at
Pipe TR1, when the metal-oxide-semiconductor TR1 drain electrodes of anti exciting converter start resonance, valley detection circuit begins to detect, and detects a ripple
Trough counter just counts once during paddy, when the trough number one that the trough number and trough counter counts of trough selector demand are counted to
When cause, logic control circuit just exports a drive signal, and control metal-oxide-semiconductor TR1 is open-minded, realizes that trough opens control.
Metal-oxide-semiconductor TR1 working frequency drains humorous with the variation relation figure and metal-oxide-semiconductor TR1 of input voltage under heavy loads
Vibration wave paddy number graph of a relation is as shown in Figure 6.When input voltage is in the first minimum gear, MOS is opened in first trough
Pipe；At input voltage highest fourth speed position, metal-oxide-semiconductor is opened in the 4th trough.Since when input voltage raises, MOS
Resonance trough quantity adds in pipe TR1 switch periods, so metal-oxide-semiconductor TR1 switch periods time increase, is effectively reduced
The working frequency of metal-oxide-semiconductor when high input voltage, makes the change of the working frequency of the full input voltage range of anti exciting converter
Scope is reduced, and advantageously reduces EMI design difficulty, while ensure that the minimum of metal-oxide-semiconductor turn-on consumption.Therefore the present invention
Trough control mode is compared with the common trough control of tradition, and working frequency and the input voltage of metal-oxide-semiconductor are in inverse relation, input
The working frequency of metal-oxide-semiconductor is lower when voltage is higher, and metal-oxide-semiconductor switch periods are by the shelves of the scope division trough number of input voltage
Position, is adjusted with segmented version, makes input voltage range in same metal-oxide-semiconductor operating frequency range can be with wider, same
Input voltage range under smaller is required to the switching frequency range of control chip, the reduction of switching frequency excursion is effective
Reduce EMI circuit design difficulty.On the other hand because the voltage of anti exciting converter input itself is more stable, together
One electric capacity C4 filtering of Shi Zaijia, so the voltage at UVP pins is very stable.Because trough switching is drawn according to UVP
Pin voltage carries out selection, in the case of the voltage stabilization of UVP pins, along with the original hysteresis voltage of circuit is set,
Switching repeatedly back and forth will not will again occur when input voltage changes and causes trough to switch, therefore will not be as conventional wave
Equally there is the unstable caused frequency jitter of trough quantity in paddy control program and concussion ultimately results in output ripple and becomes big.Passing
In the case of the concussion for trough control program of uniting, output ripple can become very big, especially in DCDC application scenarios, due to major part
The conventional ripple requirement of product is just in 50mV or so, in the state of output capacitance very little, ripple when traditional scheme trough switches
Reach 100-200mV, so traditional scheme is unworkable in DCDC micropowers field.And use can be with after the present invention program
By ripple control within 50mV, so the present invention program can meet requirement of the DCDC application scenarios to ripple well.
Fig. 7 is the trough control circuit of the invention relation of output end load and working frequency under fixed input voltage
Figure, it can be seen that working frequency is reduced with the reduction of load when light load, is operated in frequency redution mode, favorably
Improve light-load efficiency.When heavier loads, into trough control model, because trough control circuit controls metal-oxide-semiconductor
The trough quantity of switch periods changes with the change of input voltage, and input voltage is constant, and trough number is constant, but with
The increase of load, primary side peak point current needs to increase, so the ON time of metal-oxide-semiconductor can increase, the erasing time also increases, this
It it is anti exciting converter circuit loop regulation ON time in itself and erasing time and automatic increased, therefore metal-oxide-semiconductor is whole
Switch periods can be slowly increased, thus cause what metal-oxide-semiconductor working frequency slowly reduced with the increase of load, can be favourable
Reduction switching loss, ensure heavy duty under efficiency it is also higher.
Embodiment two
Fig. 8 is that the trough control circuit of the embodiment of the present invention two applies the circuit theory diagrams in anti exciting converter, with reality
Apply example one to compare, the resistance R4 of main metal-oxide-semiconductor TR1 and current sampling circuit in embodiment two anti exciting converter have been integrated into control
Inside coremaking piece U1 ' chip, ambient parameters are made more to simplify.Control chip U1 ' includes UVP pins, GND pin, DRIN and drawn
Pin and FB pins, UVP pins are input voltage measurement pin, for detecting the gear of input voltage, to judge in which ripple
Under-voltage protection is opened and done to paddy；GND pin is the reference ground pin of chip；DRIN pins are switching tube drain lead, for adopting
The waveform that metal-oxide-semiconductor TR1 built in sample drains, and trough control circuit is supplied to be counted to trough quantity；And as built-in
Metal-oxide-semiconductor TR1 drain terminal, it is attached thereto for external circuits such as transformer T1 Same Name of Ends；FB pins are feedback pin, are used
In reception secondary side feedback signal so that control chip carries out Duty ratio control.
The annexation of the circuit theory diagrams of the trough control circuit of embodiment two is：Input anode VIN+ connections input
Filter capacitor C1 positive pole, electric capacity C1 negative pole connection reference ground GND ends, input VIN+ are also connected with input voltage sample circuit
In upper divider resistance R2 one end, resistance R2 other end connects lower divider resistance R3 one end and control chip U1 ' respectively
UVP pins, while connect filter capacitor C4 positive pole, electric capacity C4 negative pole and the R3 other end are connected together and to
Reference ground GND ends；Resistance R1 one end and electric capacity C2 one end, the resistance R1 other end in input VIN+ connection clamper modules
It is connected with the electric capacity C2 other end and connects diode D2 negative electrode, diode D2 anode connects transformer T1 primary side windings
Same Name of Ends, transformer T1 primary side windings different name end connection input voltage VIN+；Control chip U1 ' DRIN pins connection becomes
The Same Name of Ends of depressor T1 primary side windings, control chip U1 ' GND pin connection reference ground GND ends；Transformer T1 vice-side windings
Commutation diode D1 anode in Same Name of Ends connection output rectification filter loop, the connection output of transformer T1 vice-side winding different names end
Negative pole Vo-, commutation diode D1 negative electrode connection output head anode Vo+ are held, while connects output filter capacitor C3 positive pole, electricity
Hold the negative pole Vo- of C3 negative pole connection output end；Voltage sample isolation feedback circuit connects the positive pole Vo+ and positive pole of output end
Vo-, while connect control chip U1 ' FB pins.
Its operation principle is：Isolation more afterwards is sampled to output voltage by voltage sample isolation feedback circuit to transmit
One FB pin voltage, control chip U1 ' FB pins detection feedback voltage V FB, feedback voltage V FB is as load becomes
Change, load is bigger, and voltage is higher, and FB pin voltages are 1.2V when unloaded, is fully loaded with for 4V, FB corresponding to setting trough unlatching effectively
Voltage is 2.5V, when control chip U1 ' detects that FB pin voltages are that then trough opens enable signal to below 2.5V is low level,
Without trough control action, FB pin voltages correspond to the internal oscillators of control chip U1 ' and produce a working frequency, converter meeting
It is operated under the frequency, now belongs to frequency redution mode.When control chip U1 ' detects that FB voltages are higher than 2.5V, then trough is open-minded
Function is effective, and input voltage samples after divider resistance R2, R3 partial pressure to control chip U1 ' UVP pin, detects input voltage
Which trough gear corresponding be, it is determined that control chip U1 ' DRIN pin detection resonance trough after trough gear, works as inspection
Measure a trough just once to be counted, when trough quantity corresponding to trough gear corresponding to count number and input voltage accords with
Close, then the metal-oxide-semiconductor that can be produced inside control chip U1 ' built in a drive signal driving is open-minded, realizes trough control.
It the above is only the preferred embodiment of the present invention, it is noted that above-mentioned preferred embodiment is not construed as pair
The limitation of the present invention, for those skilled in the art, without departing from the spirit and scope of the present invention, also
Some improvements and modifications can be made, circuit is improved and retouched also should be regarded as protection scope of the present invention, here no longer
Repeated with embodiment, protection scope of the present invention should be defined by claim limited range.
Claims (9)
1. a kind of trough control circuit, carried out suitable for the trough resonance of the master power switch pipe switch periods to anti exciting converter
Control, including current detection circuit, secondary side feedback circuit and driving output circuit, current detection circuit are used for detection switch pipe
The primary side peak point current of source electrode；Secondary side feedback circuit is used for the reflection load of receiving voltage sampling isolation feedback circuit feedback
Voltage signal；Output circuit is driven to be used for switching tube output drive signal, it is characterised in that：
Also include input voltage detection circuit and waveform detection circuit,
Input voltage detection circuit, for detecting the input voltage of anti exciting converter；
Waveform detection circuit, for the waveform of sampling switch pipe drain electrode, and trough quantity is counted；Wherein,
The trough quantity of trough control circuit controlling switch pipe switch periods changes with the change of input voltage.
2. trough control circuit according to claim 1, it is characterised in that：Also include bleeder circuit, bleeder circuit is in parallel
Between the input positive terminal of anti exciting converter and ground, including resistance R2, resistance R3 and electric capacity C4, resistance R2 go here and there successively with resistance R3
Connection, is connected in series and a little forms dividing point, electric capacity C4 is connected in parallel on resistance R3 both ends；The input of the input voltage detection circuit
It is connected with the dividing point of bleeder circuit.
3. a kind of trough control circuit, it is controlled suitable for the trough resonance of the main power tube switch periods of anti exciting converter,
For integrated chip structure, including grounding pin, secondary side feedback pin, current detecting pin and driving output pin, grounding pin
For being grounded；Current detecting pin is used to be connected with the source electrode of switching tube, detects primary side peak point current；Secondary side feedback pin is used for
It is connected with voltage sample isolation feedback circuit, receives the voltage signal of the reflection load of its feedback；Output pin is driven to use
In to switching tube output drive signal, it is characterised in that：
Also include input voltage measurement pin and waveforms detection pin,
Input voltage measurement pin, for detecting the input voltage of anti exciting converter；
Waveforms detection pin, for the waveform of sampling switch pipe drain electrode, and trough quantity is counted；Wherein,
The trough quantity of trough control circuit controlling switch pipe switch periods changes with the change of input voltage.
4. trough control circuit according to claim 3, it is characterised in that：Also include bleeder circuit, bleeder circuit is in parallel
Between the input positive terminal of anti exciting converter and ground, including resistance R2, resistance R3 and electric capacity C4, resistance R2 go here and there successively with resistance R3
Connection, is connected in series and a little forms dividing point, electric capacity C4 is connected in parallel on resistance R3 both ends；The input voltage measurement pin and partial pressure electricity
The dividing point connection on road.
5. a kind of trough control circuit, it is controlled suitable for the trough resonance of the main power tube switch periods of anti exciting converter,
For integrated chip structure, including grounding pin and secondary side feedback pin, grounding pin is used to be grounded；Secondary side feedback pin be used for
Voltage sample isolation feedback circuit connects, and receives the voltage signal of the reflection load of its feedback, it is characterised in that：
Also include switching tube and resistance R4, and input voltage measurement pin and switching tube drain lead,
Switching tube and resistance R4 are integrated in chip；
Input voltage measurement pin, for detecting the input voltage of anti exciting converter；
Switching tube drain lead, for sampling the waveform of built-in switch pipe drain electrode, and trough control circuit is supplied to trough
Quantity is counted；Wherein,
The trough quantity of trough control circuit controlling switch pipe switch periods changes with the change of input voltage.
6. trough control circuit according to claim 5, it is characterised in that：Also include bleeder circuit, bleeder circuit is in parallel
Between the input positive terminal of anti exciting converter and ground, including resistance R2, resistance R3 and electric capacity C4, resistance R2 go here and there successively with resistance R3
Connection, is connected in series and a little forms dividing point, electric capacity C4 is connected in parallel on resistance R3 both ends；The input voltage measurement pin and partial pressure electricity
The dividing point connection on road.
7. a kind of trough control method, controlled suitable for the trough resonance of the master power switch pipe switch periods of anti exciting converter
System, when feedback voltage is higher than load reference voltage, into the trough number of trough control model, i.e. controlling switch pipe switch periods
Amount changes with the change of input voltage, specifically comprises the following steps,
Input voltage measurement step, the input voltage signal of anti exciting converter is detected, and setting is divided according to the gear of input voltage
The trough quantity of switching tube switch periods；
Trough opens rate-determining steps, the waveform of sampling switch pipe drain electrode, and trough is counted；Reach setting in trough quantity
During value, controlling switch pipe is open-minded.
8. trough control method according to claim 7, it is characterised in that：The trough control model, controlling switch pipe
The trough quantity of switch periods increases with the rise of input voltage.
9. the trough control method according to claim 7 or 8, it is characterised in that：The trough control model, in input electricity
When pressing constant, load increases, trough quantity is constant, only by increasing switching tube switch periods with the increased primary side peak point current of load
ON time and the erasing time, Natural regulation switching tube switch periods are elongated, switching tube working frequency reduce.
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| CN201710899127.5A CN107742984B (en) | 2017-09-28 | 2017-09-28 | Wave trough control circuit and wave trough control method |
| PCT/CN2018/094820 WO2019062264A1 (en) | 2017-09-28 | 2018-07-06 | Wave valley control circuit and wave valley control method |
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| CN201710899127.5A CN107742984B (en) | 2017-09-28 | 2017-09-28 | Wave trough control circuit and wave trough control method |
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| WO2019062264A1 (en) | 2019-04-04 |
| CN107742984B (en) | 2020-01-21 |
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