CN107017779B - A kind of isolated form DC-DC boost converter control method of band drop-down active clamp branch - Google Patents
A kind of isolated form DC-DC boost converter control method of band drop-down active clamp branch Download PDFInfo
- Publication number
- CN107017779B CN107017779B CN201710400452.2A CN201710400452A CN107017779B CN 107017779 B CN107017779 B CN 107017779B CN 201710400452 A CN201710400452 A CN 201710400452A CN 107017779 B CN107017779 B CN 107017779B
- Authority
- CN
- China
- Prior art keywords
- voltage
- main switch
- switch
- converter
- driving circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention belongs to electroporation fields, it is related to a kind of isolated form DC-DC boost converter control method of band drop-down active clamp branch, first powered on to circuit, carry out SCM program initialization, when converter output voltage is unstable, the switching frequency of main switch and auxiliary switch is controlled by pulse frequency modulated control method, stabilization transform device output voltage, converter output voltage signal is detected from first voltage test point and is sent to control driving circuit, driving circuit is controlled according to the switching frequency of the variation adjustment circuit of converter output voltage, then judge whether converter needs to stop working, it repeats the above steps, realize the control of converter；The circuit structure that it is used is simple, at low cost, and high reliablity is high-efficient, can promote circuit gain by adjusting switching frequency, be widely used.
Description
Technical field:
The invention belongs to electroporation fields, are related to a kind of isolated DC-direct current (DC-DC) booster converter controlling party
Method, especially a kind of isolated form DC-DC boost converter control method of band drop-down active clamp branch.
Background technique:
Traditional isolated form DC-DC boost converter topological circuit has normal shock type, flyback, semi-bridge type, bridge-type, recommends
Five kinds of forms of type, wherein normal shock type and flyback circuit structure it is simple, it is at low cost, be easy to control, but there are transformers unidirectionally to encourage
Magnetic, magnetic core are easily saturated, and magnetic core utilization rate is low, and power is difficult to do big, it is difficult to the disadvantages of realizing Sofe Switch control；Semi-bridge type and complete
The transformer bidirectional excitation of bridge circuit, magnetic core utilization rate is high, and power can be done greatly, but there are problems that bias, and up and down
Bridge arm is easy to lead directly to, and circuit control relative difficulty, reliability are lower；The transformer of push-pull type circuit is also bidirectional excitation, is not deposited
Problem is led directly in upper and lower bridge arm, but still there are problems that bias, and transformer needs tap, difficult design, can not achieve
Sofe Switch.Occur a kind of isolated form DC-DC boost converter novel circuit topology, i.e. active clamp formula flyback circuit in recent years
Topology, the topological circuit can realize Sofe Switch by resonance, have circuit structure it is simple, there is no straight-through problem, it is at low cost,
The advantages that being easy to control has been applied in the front stage circuits of the micro- inverter of solar energy, but there are still lists for the New Topological
To excitation, magnetic core is easily saturated, and magnetic core utilization rate is low, and power is difficult to do the problems such as big, and the auxiliary of active clamp branch is opened
Guan Guanyu main switch complementation conducting, auxiliary switch conduction loss is larger, constrains its further popularization and application.Therefore, if
Isolated DC-DC booster converter the control method for counting a kind of band drop-down active clamp branch has application and development value very much.
Summary of the invention:
The purpose of the present invention is to overcome the shortcomings of the existing technology, on the basis of single-ended reverse exciting type circuit topology, at it
Transformer primary side parallel resonance capacitor pulls down active clamp branch in the both ends parallel connection of main switch drain-source, in transformer secondary grade
Join high frequency voltage-multiplying circuit, resonant capacitance in parallel and transformer primary side inductance carry out resonance, so that primary circuit is become bidirectional excitation, mention
High magnetic core utilization rate, and isolated converter output is improved to the voltage gain of input；The auxiliary switch of active clamp branch
It is identical as the switch periods of main switch, but a bit of time is only connected in each switch periods of auxiliary switch, and conduction loss is big
It is big to reduce, and main switch and auxiliary switch can realize Sofe Switch, and there is no straight-through problems；Transformer secondary is cascade
The asymmetrical voltage that high frequency voltage-multiplying circuit exports transformer secondary winding is utilized effectively, and makes the whole efficiency of converter
It improves.
To achieve the goals above, the present invention uses the isolated form DC-DC boost converter with drop-down active clamp branch
Realize, specific control process the following steps are included:
(1) circuit powers on, and SCM program initialization: first modulates (Pulse Width using pulse width
Modulation, PWM) soft start, i.e., given main switch and auxiliary switch original switching frequency, keep switching frequency not
Become, turn-on time is gradually increased to setting value, and converter output voltage reaches setting voltage；
(2) when converter output voltage is unstable, pass through pulse frequency modulated (Pulse Frequency
Modulation, PFM) control method control main switch and auxiliary switch switching frequency, stabilization transform device output voltage,
Detect converter output voltage signal from first voltage test point and be sent to control driving circuit, control driving circuit according to
The switching frequency of the variation adjustment circuit of converter output voltage, if converter output voltage becomes larger, control driving circuit is issued
Increase the signal of main switch, auxiliary switch switching frequency；If converter output voltage reduces, control driving circuit sending subtracts
The signal of small main switch, auxiliary switch switching frequency, thus stabilization transform device output voltage；The no-voltage of main switch is opened
Whether the voltage for crossing at detection second voltage test point its drain-source interpolar before switching tube is opened all is zero, by PWM controlling party
The driving pulse width of method control main switch is realized, before the current driving signal rising edge of main switch arrives, from the
The voltage for detecting main switch drain-source interpolar at two voltage detecting points is led if the voltage of main switch drain-source interpolar is not zero
Switching tube is not carried out that no-voltage is open-minded, and control driving circuit reduces the driving of main switch in output drive signal next time
Pulse width；If the voltage of main switch drain-source interpolar is zero, main switch realizes that no-voltage is open-minded, and control driving circuit exists
Keep the driving pulse width of main switch constant when output drive signal next time；The no-voltage of auxiliary switch, which is opened, to be passed through
Whether the voltage at clamp capacitor both ends changes, realizes by interrupting at detection tertiary voltage test point, examines when from tertiary voltage
When detecting that the voltage increment at clamp capacitor both ends is not zero at measuring point, into interruption, driving circuit is controlled auxiliary switch
Driving signal remain high level, auxiliary switch realizes that no-voltage is open-minded；When detecting pincers from tertiary voltage test point
When the voltage increment at position capacitor both ends is zero, driving circuit is controlled by the driving signal of auxiliary switch and remains low level；
(3) judge whether converter needs to stop working, if converter needs stop working, stop exporting main switch
With the driving signal of auxiliary switch；If converter does not need to stop working, converter output voltage is detected again, in repetition
Step is stated, realizes the control of converter.
The main structure of the isolated form DC-DC boost converter of band drop-down active clamp branch of the present invention includes input
Voltage, capacitor, resonant capacitance, high frequency transformer, main switch, first diode, drop-down active clamp branch, high frequency voltage-multiplying electricity
Road, equivalent load and control driving circuit；First diode is the anti-paralleled diode of main switch, and input voltage passes through capacitor
After filtering, by main switch, first diode and drop-down active clamp branch by DC inverter at high-frequency alternating current, high frequency is handed over
Galvanic electricity is applied to the both ends of primary side inductance, and secondary inductance both ends induce high-frequency ac voltage, and are after high frequency voltage-multiplying circuit
Equivalent load power supply；Input voltage is DC voltage to be boosted or is the filtered voltage in power frequency commercial power rectification, and capacitor is inhaled
Receive the inductance feedback of high frequency transformer primary side energy simultaneously play filter action, high frequency transformer by primary side inductance, secondary inductance and
Magnetic core electrical connection composition, wherein magnetic core is the magnetic core with air gap, coefficient of coup 0.5-0.95, high frequency transformer and resonance
Energy is transmitted to secondary side from primary side together by capacitor, main switch, first diode and drop-down active clamp branch for realizing
Electric energy inversion, drop-down active clamp branch routing auxiliary switch, the second diode and clamp capacitor electrical connection composition, for reducing
The voltage that main switch is born, the second diode are the anti-paralleled diode of auxiliary switch, auxiliary switch and main switch
Switching frequency is identical, and there are dead zones for the conducting of auxiliary switch and main switch, and the turn-on time of auxiliary switch is shorter, loss
It is smaller；First rectifier diode, the second rectifier diode, the first filter capacitor and the second filter capacitor electrical connection composition high frequency times
Volt circuit, for being rectified, being filtered to high-frequency alternating current, while for equivalent load power, equivalent load be capacitive load or
Inductive load detects the DC output voltage of converter, and the DC output voltage that will test from first voltage test point
It send to control driving circuit, the voltage between main switch hourglass source electrode is detected from second voltage test point, and will test
Voltage is sent to control driving circuit, before the current driving signal rising edge of main switch arrives, passes through detection main switch leakage
Whether voltage between source electrode is zero to judge whether current main switch realizes that no-voltage is open-minded；It is detected from tertiary voltage test point
The voltage at clamp capacitor both ends, and the voltage that will test is sent to control driving circuit, when the electricity for detecting clamp capacitor both ends
When pressure increases, the driving signal of auxiliary switch is remained high level by control driving circuit, and auxiliary switch realizes no-voltage
Open-minded, when the voltage at clamp capacitor both ends increases, primary side inductance is clamp capacitor charging, the two or two pole by the second diode
Pipe is connected, and the voltage between auxiliary switch hourglass source electrode is zero；Control driving circuit is received from first voltage test point, second
Main switch and auxiliary switch are exported after the voltage signal detected at voltage detecting point and tertiary voltage test point respectively
Signal is controlled, control signal driving main switch and auxiliary switch after isolation amplification are exported for stabilization transform device
DC voltage, main switch no-voltage open control, the no-voltage of auxiliary switch opens control.
Compared with prior art, the present invention transformer is able to achieve bidirectional excitation, transimission power increases；Main switch and auxiliary
Switching tube switching frequency having the same, there is no straight-through problems, can realize Sofe Switch, and auxiliary switch each switch week
The a bit of time is only connected in phase, and conduction loss greatly reduces；The cascade high frequency voltage-multiplying circuit of transformer secondary makes transformer pair
The asymmetrical voltage of side winding output is utilized effectively, and improves the whole efficiency of converter；In parallel humorous of transformer primary side
Vibration capacitor and transformer primary side inductance carry out resonance and make voltage gain with higher between converter input/output, in transformation
In the case that device turn ratio is certain, converter output voltage can be further increased by pulse frequency modulated, has output voltage
There is very wide adjusting range；Its circuit structure is simple, at low cost, and high reliablity is high-efficient, can be promoted by adjusting switching frequency
Circuit gain, can be widely used for the front stage circuits of middle-size and small-size or miniature photovoltaic DC-to-AC converter, the front stage circuits of middle-size and small-size ups power,
In the circuits such as middle-size and small-size isolation DC-DC boost converter, frequency-conversion microwave oven main circuit and wireless power transmission.
Detailed description of the invention:
Fig. 1 is that the circuit topology of the isolated form DC-DC boost converter of band drop-down active clamp branch of the present invention is former
Reason figure.
Fig. 2 is the control technique stream of the isolated form DC-DC boost converter of band drop-down active clamp branch of the present invention
Cheng Tu.
Fig. 3 is the work of the new topology of isolated form DC-DC boost converter of band drop-down active clamp branch of the present invention
Waveform diagram, wherein Ugs1For main switch Q1Driving voltage, Ugs2For auxiliary switch Q2Driving voltage, Uds1For main switch
Q1Voltage between hourglass source electrode, Uds2For auxiliary switch Q2Voltage between hourglass source electrode, UPFor resonant capacitance CrThe voltage at both ends,
IPFor primary inductor LPElectric current, UCFor clamp capacitor CCThe voltage at both ends.
Specific embodiment:
Technical solution of the present invention is described in more detail in the following with reference to the drawings and specific embodiments.
Embodiment:
The present embodiment uses the isolated form DC-DC boost converter with drop-down active clamp branch to realize, specifically controls
Journey the following steps are included:
(1) circuit powers on, SCM program initialization: first using PWM soft start, i.e., given main switch Q1It is opened with auxiliary
Close pipe Q2Original switching frequency keeps switching frequency constant, and turn-on time is gradually increased to setting value, and converter output voltage reaches
To setting voltage；
(2) when converter output voltage is unstable, main switch Q is controlled by PFM control1And auxiliary switch
Q2Switching frequency, stabilization transform device output voltage, from first voltage test point 1. from detection converter output voltage signal simultaneously
Be sent to control driving circuit 4, control driving circuit 4 according to the switching frequency of the variation adjustment circuit of converter output voltage,
If converter output voltage becomes larger, control driving circuit 4, which issues, increases main switch Q1, auxiliary switch Q2The letter of switching frequency
Number；If converter output voltage reduces, control driving circuit 4, which issues, reduces main switch Q1, auxiliary switch Q2Switching frequency
Signal, thus stabilization transform device output voltage；Main switch Q1No-voltage open by detect second voltage test point 2. locate
Main switch Q1Whether the voltage of its drain-source interpolar is zero, controls main switch Q by PWM control method before opening1Driving arteries and veins
Width is rushed to realize, in main switch Q1Before current driving signal rising edge arrives, from second voltage test point 2. from detect
Main switch Q1The voltage of drain-source interpolar, if main switch Q1The voltage of drain-source interpolar is not zero, then main switch Q1It is not carried out
No-voltage is open-minded, and control driving circuit 4 reduces main switch Q in output drive signal next time1Driving pulse width；If
Main switch Q1The voltage of drain-source interpolar is zero, then main switch Q1It realizes that no-voltage is open-minded, controls driving circuit 4 next time
Main switch Q is kept when output drive signal1Driving pulse width it is constant；Auxiliary switch Q2No-voltage open and pass through inspection
It surveys tertiary voltage test point and 3. locates clamp capacitor CCWhether the voltage at both ends change, realizes by interrupting, when from tertiary voltage
3. place detects clamp capacitor C to test pointCWhen the voltage increment at both ends is not zero, into interruption, driving circuit 4 is controlled auxiliary
Switching tube Q2Driving signal remain high level, auxiliary switch Q2Realize that no-voltage is open-minded；When from tertiary voltage test point 3.
Place detects clamp capacitor CCWhen the voltage increment at both ends is zero, driving circuit 4 is controlled by auxiliary switch Q2Driving signal protect
It holds as low level；
(3) judge whether converter needs to stop working, if converter needs stop working, stop exporting main switch
Q1With auxiliary switch Q2Driving signal；If converter does not need to stop working, converter output voltage, weight are detected again
Multiple above-mentioned steps, realize the control of converter.
The main structure of isolated form DC-DC boost converter with drop-down active clamp branch described in the present embodiment includes defeated
Enter voltage Ui, capacitor Ci, resonant capacitance Cr, high frequency transformer 1, main switch Q1, first diode DQ1, drop-down active clamp branch
Road 2, high frequency voltage-multiplying circuit 3, equivalent load Z and control driving circuit 4；First diode DQ1For main switch Q1Inverse parallel two
Pole pipe, input voltage UiBy capacitor CiAfter filtering, by main switch Q1, first diode DQ1It will with drop-down active clamp branch 2
DC inverter is applied to primary inductor L at high-frequency alternating current, high-frequency alternating currentPBoth ends, secondary inductance LSBoth ends induce height
Frequency alternating voltage, and power after high frequency voltage-multiplying circuit 3 for equivalent load Z；Input voltage UiFor DC voltage to be boosted or
Person is the filtered voltage in power frequency commercial power rectification, capacitor CiAbsorb 1 primary inductor L of high frequency transformerPThe energy of feedback simultaneously plays filter
Wave effect, high frequency transformer is by primary inductor LP, secondary inductance LsIt is electrically connected and forms with magnetic core T, wherein magnetic core T is with air gap
Magnetic core, coefficient of coup 0.5-0.95, high frequency transformer 1 and resonant capacitance CrEnergy is transmitted to pair from primary side together
Side, main switch Q1, first diode DQ1With drop-down active clamp branch 2 for realizing electric energy inversion, active clamp branch is pulled down
Road 2 is by auxiliary switch Q2, the second diode DQ2With clamp capacitor CCElectrical connection composition, for reducing main switch Q1It bears
Voltage, the second diode DQ2For auxiliary switch Q2Anti-paralleled diode, auxiliary switch Q2With main switch Q1Switching frequency
It is identical, auxiliary switch Q2With main switch Q1Conducting there are dead zone, auxiliary switch Q2Turn-on time it is shorter, loss compared with
It is small；First rectifier diode D1, the second rectifier diode D2, the first filter capacitor C1With the second filter capacitor C2Electrical connection composition
High frequency voltage-multiplying circuit 3 is powered for being rectified, being filtered to high-frequency alternating current, while for equivalent load Z, and equivalent load Z is to hold
Property load or inductive load, the 1. DC output voltage of place's detection converter from first voltage test point and will test straight
Stream output voltage send to control driving circuit 4, from second voltage test point 2. place detection main switch Q1Electricity between hourglass source electrode
Pressure, and the voltage that will test is sent to control driving circuit 4, in main switch Q1Before current driving signal rising edge arrives,
By detecting main switch Q1The voltage of drain-source interpolar judges current main switch Q1Whether realize that no-voltage is open-minded；From third electricity
3. pressure test point is located to detect clamp capacitor CCThe voltage at both ends, and the voltage that will test is sent to control driving circuit 4, works as detection
To clamp capacitor CCWhen the voltage at both ends increases, driving circuit 4 is controlled by auxiliary switch Q2Driving signal remain high electricity
It is flat, auxiliary switch Q2Realize that no-voltage is open-minded, as clamp capacitor CCWhen the voltage at both ends increases, primary inductor LPPass through second
Diode DQ2For clamp capacitor CCCharging, the second diode DQ2Conducting, auxiliary switch Q2Voltage between hourglass source electrode is zero；Control
Driving circuit 4 processed receive from first voltage test point 1., second voltage test point 2. with tertiary voltage test point 3. from detect
To voltage signal after export main switch Q respectively1With auxiliary switch Q2Control signal, control signal by isolation amplification
Main switch Q is driven later1With auxiliary switch Q2, DC voltage, main switch Q for the output of stabilization transform device1Zero electricity
Press off logical control, auxiliary switch Q2No-voltage open control.
Described in the present embodiment with drop-down active clamp branch isolated form DC-DC boost converter the course of work include with
Next stage:
t0-t1Period: in t0Moment, main switch Q1Driving voltage Ugs1Become high level, at this time primary inductor LPElectricity
Stream is negative, main switch Q1It is not turned on, primary inductor LPPass through first diode DQ1With capacitor CiAfterflow, main switch Q1Drain-source
The voltage of interpolar is zero, arrives t1Moment, primary inductor LPElectric current become 0, main switch Q1Conducting, main switch Q1Realize zero
Voltage is open-minded；
t1-t2Period: input voltage UiFor primary inductor LPCharging, primary inductor LPElectric current gradually increase, arrive t2Moment,
Main switch Q1Driving voltage Ugs1Become low level, main switch Q1Shutdown；
t2-t3Period: resonant capacitance CrFor primary inductor LPCharging, primary inductor LPElectric current continue growing, arrive t3Moment,
Resonant capacitance CrVoltage be reduced to zero, primary inductor LPElectric current increase to maximum；
t3-t4Period: primary inductor LPIt is reversed resonant capacitance CrCharging, resonant capacitance CrVoltage reversal increase, resonance
Capacitor CrVoltage add capacitor CiVoltage be less than clamp capacitor CCVoltage, the second diode DQ2Reversed cut-off, arrives t4When
It carves, resonant capacitance CrVoltage add capacitor CiVoltage be greater than clamp capacitor CCVoltage, the second diode DQ2Conducting；
t4-t5Period: primary inductor LPIt is simultaneously resonant capacitance CrWith clamp capacitor CCCharging, clamp capacitor CCVoltage by
It is cumulative big, arrive t5Moment, auxiliary switch Q2Driving voltage Ugs2Become high level, but primary inductor LPElectric current be still positive,
Auxiliary switch Q2It is not turned on；
t5-t6Period: primary inductor LPContinue as resonant capacitance CrWith clamp capacitor CCCharging, the second diode DQ2Conducting,
Auxiliary switch Q2The voltage of drain-source interpolar is zero, arrives t6Moment, primary inductor LPElectric current fall to zero, resonant capacitance Cr's
Voltage reversal increases to maximum, while clamp capacitor CCVoltage increase to maximum, auxiliary switch Q2Conducting, auxiliary switch
Q2Realize that no-voltage is open-minded；
t6-t7Period: resonant capacitance CrWith clamp capacitor CCIt is simultaneously primary inductor LPT is arrived in reverse charging7Moment, auxiliary
Switching tube Q2Driving voltage Ugs2Become low level, auxiliary switch Q2Shutdown, clamp capacitor CCStop being primary inductor LPIt fills
Electricity；
t7-t8Period: resonant capacitance CrVoltage reduce, primary inductor LPElectric current reduce, arrive t8Moment, resonant capacitance Cr
Voltage become 0；
t8-t9Period: primary inductor LPFor former resonant capacitance CrReverse charging, resonant capacitance CrVoltage gradually increase, arrive
t9Moment, resonant capacitance CrVoltage increase to and capacitor CiVoltage it is equal；
t9-t10Period: primary inductor LPPass through first diode DQ1With capacitor CiT is arrived in afterflow10Moment, main switch Q1
Driving voltage Ugs1Become high level, at this time primary inductor LPElectric current be negative, main switch Q1It is not turned on.
Claims (2)
1. a kind of isolated form DC-DC boost converter control method of band drop-down active clamp branch, it is characterised in that: use band
Pull down active clamp branch isolated form DC-DC boost converter realize, specific control process the following steps are included:
(1) circuit powers on, and SCM program initialization: first modulating soft start using pulse width, i.e., given main switch and auxiliary
Switching tube original switching frequency is helped, keeps switching frequency constant, turn-on time is gradually increased to setting value, converter output voltage
Reach setting voltage；
(2) when detecting that converter output voltage changes, main switch is controlled by pulse frequency modulated control method
With the switching frequency of auxiliary switch, stabilization transform device output voltage detects converter output electricity from first voltage test point
Pressure signal is simultaneously sent to control driving circuit, controls driving circuit according to the switch of the variation adjustment circuit of converter output voltage
Frequency, if converter output voltage becomes larger, control driving circuit issues the letter for increasing main switch, auxiliary switch switching frequency
Number；If converter output voltage reduces, control driving circuit issues the letter for reducing main switch, auxiliary switch switching frequency
Number, thus stabilization transform device output voltage；When converter output voltage does not change, the no-voltage of main switch is opened logical
Whether the voltage for crossing at detection second voltage test point its drain-source interpolar before switching tube is opened is zero, by the control of PWM control method
The driving pulse width of main switch processed is realized, before the current driving signal rising edge of main switch arrives, from the second electricity
Press the voltage that main switch drain-source interpolar is detected at test point, if the voltage of main switch drain-source interpolar is not zero, main switch
Pipe is not carried out that no-voltage is open-minded, and control driving circuit reduces the driving pulse of main switch in output drive signal next time
Width；If the voltage of main switch drain-source interpolar is zero, main switch realizes that no-voltage is open-minded, controls driving circuit next
Keep the driving pulse width of main switch constant when secondary output drive signal；The no-voltage of auxiliary switch, which is opened, passes through detection
Whether the voltage at clamp capacitor both ends changes, realizes by interrupting at tertiary voltage test point, when from tertiary voltage test point
When place detects that the voltage increment at clamp capacitor both ends is not zero, into interruption, driving circuit is controlled the drive of auxiliary switch
Dynamic signal remains high level, and auxiliary switch realizes that no-voltage is open-minded；When detected from tertiary voltage test point clamper electricity
When the voltage increment for holding both ends is zero, driving circuit is controlled by the driving signal of auxiliary switch and remains low level；
(3) judge whether converter needs to stop working, if converter needs stop working, stop exporting main switch and auxiliary
Help the driving signal of switching tube；If converter does not need to stop working, converter output voltage is detected again, repeats above-mentioned step
Suddenly, the control of converter is realized.
2. the isolated form DC-DC boost converter control method according to claim 1 with drop-down active clamp branch, special
Sign is: on the basis of single-ended reverse exciting type circuit topology, in its transformer primary side parallel resonance capacitor, in main switch drain-source
Both ends parallel connection pulls down active clamp branch, cascades high frequency voltage-multiplying circuit, resonant capacitance and transformer in parallel in transformer secondary
Primary side inductance carries out resonance, and specific structure includes input voltage, capacitor, resonant capacitance, high frequency transformer, main switch, first
Diode, drop-down active clamp branch, high frequency voltage-multiplying circuit, equivalent load and control driving circuit；It is opened based on first diode
The anti-paralleled diode of pipe is closed, input voltage is after capacitor filtering, by main switch, first diode and drop-down active clamp
For branch by DC inverter at high-frequency alternating current, high-frequency alternating current is applied to the both ends of primary side inductance, the induction of secondary inductance both ends
High-frequency ac voltage out, and power after high frequency voltage-multiplying circuit for equivalent load；Input voltage be DC voltage to be boosted or
Person is the filtered voltage in power frequency commercial power rectification, and the energy of capacitive absorption high frequency transformer primary side inductance feedback simultaneously plays filtering work
With, high frequency transformer is made of the electrical connection of primary side inductance, secondary inductance and magnetic core, and wherein magnetic core is the magnetic core with air gap,
The coefficient of coup is 0.5-0.95, and energy is transmitted to secondary side, main switch, from primary side together by high frequency transformer and resonant capacitance
One diode and drop-down active clamp branch pull down active clamp branch and route auxiliary switch, second for realizing electric energy inversion
Diode and clamp capacitor electrical connection composition, for reducing the voltage that main switch is born, the second diode is auxiliary switch
Anti-paralleled diode, auxiliary switch is identical with main switch switching frequency, and the conducting of auxiliary switch and main switch is deposited
In dead zone, the turn-on time of auxiliary switch is shorter, is lost smaller；First rectifier diode, the second rectifier diode, the first filter
Wave capacitor and the second filter capacitor electrical connection composition high frequency voltage-multiplying circuit, for being rectified, being filtered to high-frequency alternating current, simultaneously
For equivalent load power supply, equivalent load is capacitive load or inductive load, and the straight of converter is detected from first voltage test point
Output voltage is flowed, and the DC output voltage that will test is sent to control driving circuit, and master is detected from second voltage test point
Voltage between switching tube hourglass source electrode, and the voltage that will test is sent to control driving circuit, currently drives letter in main switch
Before number rising edge arrives, whether the voltage by detecting main switch drain-source interpolar is zero judges whether current main switch is real
Existing no-voltage is open-minded；The voltage at clamp capacitor both ends is detected from tertiary voltage test point, and the voltage that will test is sent to control
Driving circuit processed, when detecting the voltage increase at clamp capacitor both ends, control driving circuit believes the driving of auxiliary switch
High level number is remained, auxiliary switch realizes that no-voltage is open-minded, and when the voltage at clamp capacitor both ends increases, primary side inductance is logical
It crosses the second diode to charge for clamp capacitor, the second diode current flow, the voltage between auxiliary switch hourglass source electrode is zero；Control
Driving circuit receives the voltage letter detected from first voltage test point, second voltage test point and tertiary voltage test point
The control signal of main switch and auxiliary switch is exported after number respectively, control signal drives main switch after isolation amplification
Pipe and auxiliary switch open control, auxiliary switch for the DC voltage of stabilization transform device output, the no-voltage of main switch
The no-voltage of pipe opens control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710400452.2A CN107017779B (en) | 2017-05-31 | 2017-05-31 | A kind of isolated form DC-DC boost converter control method of band drop-down active clamp branch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710400452.2A CN107017779B (en) | 2017-05-31 | 2017-05-31 | A kind of isolated form DC-DC boost converter control method of band drop-down active clamp branch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107017779A CN107017779A (en) | 2017-08-04 |
| CN107017779B true CN107017779B (en) | 2019-05-10 |
Family
ID=59451775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710400452.2A Expired - Fee Related CN107017779B (en) | 2017-05-31 | 2017-05-31 | A kind of isolated form DC-DC boost converter control method of band drop-down active clamp branch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107017779B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109245569B (en) | 2018-09-18 | 2020-04-24 | 西安矽力杰半导体技术有限公司 | Flyback converter and control circuit thereof |
| CN110967552B (en) * | 2019-12-20 | 2021-08-27 | 上海贝岭股份有限公司 | Detection circuit for output voltage of charge pump and EEPROM |
| CN112769320B (en) * | 2021-01-04 | 2022-11-29 | 南京博兰得电子科技有限公司 | Clamp switch driving circuit |
| CN113489310B (en) * | 2021-06-11 | 2022-06-03 | 深圳英飞源技术有限公司 | Frequency conversion control method and device of DC-DC converter |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100384068C (en) * | 2004-06-25 | 2008-04-23 | 台达电子工业股份有限公司 | Driving circuit for DC/DC converter voltage and level transferring method |
| CN102122890B (en) * | 2010-10-11 | 2014-01-22 | 南京航空航天大学 | Control method for auxiliary switching tube of active clamp flyback converter |
| US8699237B2 (en) * | 2012-05-30 | 2014-04-15 | National Tsing Hua University | Soft-switching inverter utilizing high step up ratio circuit with active clamping |
| CN203135738U (en) * | 2013-03-28 | 2013-08-14 | 厦门翰普电子有限公司 | Structure of LC resonant power supply |
| CN104300795B (en) * | 2014-10-11 | 2017-08-11 | 广州金升阳科技有限公司 | A kind of anti exciting converter and its control method |
-
2017
- 2017-05-31 CN CN201710400452.2A patent/CN107017779B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN107017779A (en) | 2017-08-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107017780B (en) | A kind of the isolated form DC-DC boost converter and its control method of band pull-up active clamp branch | |
| CN107147296B (en) | A kind of isolated form DC-DC boost converter of band drop-down active clamp branch | |
| CN101854120B (en) | High-efficiency multifunctional flyback converter | |
| CN107017779B (en) | A kind of isolated form DC-DC boost converter control method of band drop-down active clamp branch | |
| CN106981994A (en) | A kind of single tube both-end inversion isolated form DC DC booster converters | |
| CN103580301B (en) | A kind of wireless power transmission power control system and method | |
| CN108900100B (en) | A kind of single-phase high efficiency high frequency isolated form rectifier | |
| CN101471606A (en) | LLC resonant transformation device | |
| CN103208849B (en) | A kind of charging device | |
| CN108964474A (en) | A kind of three mode rectification topologies based on LLC resonant converter | |
| CN108988652A (en) | Flyback active clamp circuit and its control method | |
| CN107517020A (en) | A kind of grid-connected micro- inverter of stage photovoltaic single and its control method | |
| CN107147298B (en) | A kind of microwave oven magnetic power supply device with pull-up active clamp branch | |
| CN106505866A (en) | A kind of three Level Full Bridge DC converters | |
| CN204578376U (en) | There is the LLC resonant converter of current-limiting function | |
| CN106787757A (en) | A kind of CLTCL resonance DCs converter | |
| CN107332453B (en) | A kind of stage photovoltaic single off-network inverter and its control method | |
| CN112311106A (en) | Single-stage full-bridge constant-current constant-voltage wireless charging device and control method thereof | |
| CN209860803U (en) | Non-contact single-tube resonant converter | |
| CN209170230U (en) | DC-DC Switching Power Supply based on synchronous rectification mode | |
| Askarian et al. | Variable frequency control for isolated, nonresonant single-stage AC–DC converter with a constant DC-link voltage | |
| CN110212778A (en) | A kind of non-contact single tube controlled resonant converter | |
| CN109302078A (en) | DC-DC Switching Power Supply based on synchronous rectification mode | |
| CN107134927B (en) | A kind of inductively coupled power transfer device with drop-down auxiliary switch | |
| CN107147297B (en) | A kind of inductively coupled power transfer control method with drop-down auxiliary switch |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220321 Address after: 266000 Room 601, building J, International Innovation Park, 177 Songling Road, Laoshan District, Qingdao, Shandong Patentee after: Qingdao zhongkedeneng Photoelectric Technology Co.,Ltd. Address before: 266000 Hongkong East Road, Laoshan District, Qingdao, Shandong Province, No. 7 Patentee before: QINGDAO University |
|
| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190510 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |