CN107017779A - A kind of band pulls down the isolated form DC DC booster converter control methods of active clamp branch road - Google Patents
A kind of band pulls down the isolated form DC DC booster converter control methods of active clamp branch road Download PDFInfo
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- CN107017779A CN107017779A CN201710400452.2A CN201710400452A CN107017779A CN 107017779 A CN107017779 A CN 107017779A CN 201710400452 A CN201710400452 A CN 201710400452A CN 107017779 A CN107017779 A CN 107017779A
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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
-
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention belongs to electroporation field, it is related to the isolated form DC DC booster converter control methods that a kind of band pulls down active clamp branch road, first to electric on 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 at first voltage test point and control drive circuit is sent to, drive circuit is controlled according to the switching frequency of the change adjustment circuit of converter output voltage, then judge whether converter needs to be stopped, repeat the above steps, realize the control of converter；Its circuit structure used is simple, and cost is low, and reliability is high, efficiency high, can lift circuit gain by adjusting switching frequency, be widely used.
Description
Technical field：
The invention belongs to electroporation field, it is related to a kind of isolated DC-direct current (DC-DC) booster converter controlling party
Method, particularly a kind of band pulls down the isolated form DC-DC boost converter control method of active clamp branch road.
Background technology：
Traditional isolated form DC-DC boost converter topological circuit has normal shock type, flyback, semi-bridge type, bridge-type, recommended
Five kinds of forms of type, wherein, normal shock type and flyback circuit structure are simple, cost is low, be easily controlled, but there is transformer and unidirectionally encourage
Magnetic, magnetic core is easily saturated, and magnetic core utilization rate is low, and power is difficult to do big, it is difficult to realize the shortcomings of Sofe Switch is controlled；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 magnetic bias, and up and down
Bridge arm is easily led directly to, and circuit control relative difficulty, reliability are relatively low；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 magnetic bias, and transformer needs tap, difficult design, it is impossible to realize
Sofe Switch.A kind of isolated form DC-DC boost converter novel circuit topology, i.e. active clamp formula flyback circuit are occurred in that in recent years
Topology, the topological circuit can realize Sofe Switch by resonance, with circuit structure it is simple, in the absence of straight-through problem, cost it is low,
Among the advantages of being easily controlled, the front stage circuits for being applied to the micro- inverter of solar energy, but the New Topological still suffers from list
To excitation, magnetic core is easily saturated, and magnetic core utilization rate is low, the problems such as power is difficult to do big, and the auxiliary of active clamp branch road is opened
Close pipe to turn on main switch complementation, auxiliary switch conduction loss is larger, constrains its further popularization and application.Therefore, if
Count a kind of isolated DC-DC booster converter control method of band drop-down active clamp branch road has application and development value very much.
The content of the invention：
It is an object of the invention to overcome the shortcoming of prior art, on the basis of single-ended reverse exciting type circuit topology, at it
Transformer primary side parallel resonance electric capacity, in main switch drain-source two ends parallel connection drop-down active clamp branch road, in transformer secondary level
Join high frequency voltage-multiplying circuit, resonant capacitance in parallel carries out resonance with transformer primary side inductance, primary circuit is become bidirectional excitation, carry
High magnetic core utilization rate, and improve voltage gain of the isolated converter output to input；The auxiliary switch of active clamp branch road
It is identical with the switch periods of main switch, but each switch periods of auxiliary switch only turn on a bit of time, and conduction loss is big
It is big to reduce, and main switch and auxiliary switch can realize Sofe Switch, in the absence of straight-through problem；Transformer secondary cascade
High frequency voltage-multiplying circuit causes the asymmetrical voltage that transformer secondary winding is exported to be utilized effectively, and makes the whole efficiency of converter
Improve.
To achieve these goals, the present invention is using the isolated form DC-DC boost converter with drop-down active clamp branch road
Realize, specific control process comprises the following steps：
(1) it is electric on circuit, SCM program initialization：First use pulse width modulation (Pulse Width
Modulation, PWM) soft start, that is, main switch and auxiliary switch original switching frequency are given, maintained switch frequency is not
Become, ON time is gradually increased to setting value, and converter output voltage reaches setting voltage；
(2) when converter output voltage is unstable, pulse frequency modulated (Pulse Frequency are passed through
Modulation, PFM) control method control main switch and auxiliary switch switching frequency, stabilization transform device output voltage,
Converter output voltage signal is detected at first voltage test point and control drive circuit is sent to, control drive circuit according to
The switching frequency of the change adjustment circuit of converter output voltage, if converter output voltage becomes big, control drive circuit is sent
Increase main switch, the signal of auxiliary switch switching frequency；If converter output voltage reduces, control drive circuit, which is sent, to be subtracted
The signal of small main switch, auxiliary switch switching frequency, so that stabilization transform device output voltage；The no-voltage of main switch is opened
Whether the voltage for crossing its drain-source interpolar before switching tube is opened at detection second voltage test point all is zero, by PWM controlling parties
The driving pulse width of method control main switch is realized, before the current drive signal rising edge of main switch arrives, from the
The voltage of main switch drain-source interpolar is detected at two voltage detecting points, if the voltage of main switch drain-source interpolar is not zero, is led
Switching tube is not carried out that no-voltage is open-minded, and control drive 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 drive circuit exists
Keep the driving pulse width of main switch constant during output drive signal next time；The no-voltage of auxiliary switch, which is opened, to be passed through
Whether the voltage at clamp capacitor two ends changes, is realized by interrupting at detection tertiary voltage test point, is examined when from tertiary voltage
When the voltage increment that clamp capacitor two ends are detected at measuring point is not zero, into interruption, control drive circuit is auxiliary switch
Drive signal remain high level, auxiliary switch realizes that no-voltage is open-minded；When detecting pincers at tertiary voltage test point
When the voltage increment at position electric capacity two ends is zero, the drive signal of auxiliary switch is remained low level by control drive circuit；
(3) judge whether converter needs to be stopped, if converter needs to be stopped, stop output main switch
With the drive signal of auxiliary switch；If converter need not be stopped, detect again in converter output voltage, repetition
Step is stated, the control of converter is realized.
The agent structure of the isolated form DC-DC boost converter of band drop-down active clamp branch road of the present invention includes input
Voltage, electric capacity, resonant capacitance, high frequency transformer, main switch, the first diode, drop-down active clamp branch road, high frequency voltage-multiplying electricity
Road, equivalent load and control drive circuit；First diode is the anti-paralleled diode of main switch, and input voltage passes through electric capacity
After filtering, by main switch, the first diode and drop-down active clamp branch road by DC inverter into high-frequency alternating current, high frequency is handed over
Stream electricity is applied to the two ends of primary side inductance, and secondary inductance two ends induce high-frequency ac voltage, and are after high frequency voltage-multiplying circuit
Equivalent load is powered；Input voltage is DC voltage to be boosted or is the filtered voltage in power frequency commercial power rectification, and electric capacity is inhaled
Receive high frequency transformer primary side inductance feedback energy simultaneously play filter action, high frequency transformer by primary side inductance, secondary inductance and
Magnetic core electrical connection composition, wherein magnetic core are the magnetic core with air gap, and its coefficient of coup is 0.5-0.95, high frequency transformer and resonance
Energy is delivered to secondary by electric capacity from primary side together, and main switch, the first diode and drop-down active clamp branch road are used to realize
Electric energy inversion, drop-down active clamp branch route auxiliary switch, the second diode and clamp capacitor electrical connection composition, for reducing
The voltage that main switch is born, the second diode is the anti-paralleled diode of auxiliary switch, auxiliary switch and main switch
Switching frequency is identical, and the conducting of auxiliary switch and main switch has dead band, and the ON time of auxiliary switch is shorter, loss
It is smaller；First commutation diode, the second commutation diode, the first filter capacitor and the second filter capacitor electrical connection composition high frequency times
Volt circuit, for carrying out rectification, filtering to high-frequency alternating current, while powered for equivalent load, equivalent load be capacitive load or
Inductive load, detects the VD of converter at first voltage test point, and by the VD detected
Control drive circuit is delivered to, the voltage between main switch hourglass source electrode is detected at second voltage test point, and will detect
Voltage delivers to control drive circuit, before the current drive signal rising edge of main switch arrives, by detecting that main switch leaks
Whether voltage between source electrode is zero to judge whether current main switch realizes that no-voltage is open-minded；Detected at tertiary voltage test point
The voltage at clamp capacitor two ends, and the voltage detected is delivered into control drive circuit, when the electricity for detecting clamp capacitor two ends
During pressure increase, the drive signal of auxiliary switch is remained high level by control drive circuit, and auxiliary switch realizes no-voltage
Open-minded, when the voltage increase at clamp capacitor two ends, primary side inductance is charged by the second diode for clamp capacitor, the two or two pole
Pipe is turned on, and the voltage between auxiliary switch hourglass source electrode is zero；Control drive 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
Control signal, control signal driving main switch and auxiliary switch after isolation amplification, for the output of stabilization transform device
DC voltage, the no-voltage of main switch opens control, the no-voltage of auxiliary switch opens control.
Compared with prior art, transformer can realize bidirectional excitation, transimission power increase to the present invention；Main switch and auxiliary
Switching tube has identical switching frequency, in the absence of straight-through problem, can realize Sofe Switch, and auxiliary switch each switchs week
Phase only turns on a bit of time, and conduction loss is greatly reduced；The high frequency voltage-multiplying circuit of transformer secondary cascade causes 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
Shake electric capacity and transformer primary side inductance carries out resonance so that having higher voltage gain between converter input/output, in transformation
In the case that device turn ratio is certain, converter output voltage can be further improved by pulse frequency modulated, has output voltage
There is very wide adjusting range；Its circuit structure is simple, and cost is low, and reliability is high, efficiency high, can be lifted 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.
Brief description of the drawings：
Fig. 1 is that the circuit topology of the isolated form DC-DC boost converter of band drop-down active clamp branch road 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 road 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 road of the present invention
Oscillogram, 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 two ends,
IPFor primary inductor LPElectric current, UCFor clamp capacitor CCThe voltage at two ends.
Embodiment：
Technical scheme is described in more detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment：
The present embodiment uses the isolated form DC-DC boost converter with drop-down active clamp branch road to realize, specifically controls
Journey comprises the following steps：
(1) it is electric on circuit, SCM program initialization：PWM soft starts are first used, that is, give main switch Q1Opened with auxiliary
Close pipe Q2Original switching frequency, maintained switch frequency is constant, and 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
Control drive circuit 4 is sent to, drive circuit 4 is controlled according to the switching frequency of the change adjustment circuit of converter output voltage,
If converter output voltage becomes big, control drive circuit 4 sends increase main switch Q1, auxiliary switch Q2The letter of switching frequency
Number；If converter output voltage reduces, control drive circuit 4 sends reduction main switch Q1, auxiliary switch Q2Switching frequency
Signal, so that stabilization transform device output voltage；Main switch Q1No-voltage open by detecting that 2. second voltage test point is located
Main switch Q1Whether the voltage of its drain-source interpolar is zero, controls main switch Q by PWM control methods before opening1Driving arteries and veins
Rush width to realize, in main switch Q1Before current drive 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 drive 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 Q1Realize that no-voltage is open-minded, control drive circuit 4 is next time
Main switch Q is kept during output drive signal1Driving pulse width it is constant；Auxiliary switch Q2No-voltage open by inspection
Survey tertiary voltage test point and 3. locate clamp capacitor CCWhether the voltage at two ends change, is realized by interrupting, when from tertiary voltage
3. place detects clamp capacitor C to test pointCWhen the voltage increment at two ends is not zero, into interruption, control drive circuit 4 is auxiliary
Switching tube Q2Drive 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 two ends is zero, drive circuit 4 is controlled by auxiliary switch Q2Drive signal protect
Hold as low level；
(3) judge whether converter needs to be stopped, if converter needs to be stopped, stop output main switch
Q1With auxiliary switch Q2Drive signal；If converter need not be stopped, converter output voltage, weight are detected again
Multiple above-mentioned steps, realize the control of converter.
The agent structure of isolated form DC-DC boost converter with drop-down active clamp branch road described in the present embodiment includes defeated
Enter voltage Ui, electric capacity Ci, resonant capacitance Cr, high frequency transformer 1, main switch Q1, the first diode DQ1, drop-down active clamp branch
Road 2, high frequency voltage-multiplying circuit 3, equivalent load Z and control drive circuit 4；First diode DQ1For main switch Q1Inverse parallel two
Pole pipe, input voltage UiBy electric capacity CiAfter filtering, by main switch Q1, the first diode DQ1Will with drop-down active clamp branch road 2
DC inverter is applied to primary inductor L into high-frequency alternating current, high-frequency alternating currentPTwo ends, secondary inductance LSTwo ends induce height
Frequency alternating voltage, and powered 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, electric capacity CiAbsorb the primary inductor L of high frequency transformer 1PThe energy of feedback simultaneously plays filter
Ripple is acted on, and high frequency transformer is by primary inductor LP, secondary inductance LsElectrically connect and constitute with magnetic core T, wherein magnetic core T is with air gap
Magnetic core, its coefficient of coup be 0.5-0.95, high frequency transformer 1 and resonant capacitance CrEnergy is delivered to pair from primary side together
Side, main switch Q1, the first diode DQ1It is used to realize electric energy inversion with drop-down active clamp branch road 2, pulls down active clamp branch
Road 2 is by auxiliary switch Q2, the second diode DQ2With clamp capacitor CCElectrical connection composition, for reducing main switch Q1Bear
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 is dead band, auxiliary switch Q2ON time it is shorter, loss compared with
It is small；First commutation diode D1, the second commutation diode D2, the first filter capacitor C1With the second filter capacitor C2Electrical connection composition
High frequency voltage-multiplying circuit 3, for carrying out rectification, filtering to high-frequency alternating current, while being powered for equivalent load Z, equivalent load Z is appearance
Property load or inductive load, from first voltage test point 1. from detect the VD of converter, it is and straight by what is detected
Stream output voltage delivers to control drive circuit 4, from second voltage test point 2. from detection main switch Q1Electricity between hourglass source electrode
Pressure, and the voltage detected is delivered into control drive circuit 4, in main switch Q1Before current drive 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 the 3rd electricity
3. pressure test point locates detection clamp capacitor CCThe voltage at two ends, and the voltage detected is delivered into control drive circuit 4, work as detection
To clamp capacitor CCDuring the voltage increase at two ends, drive circuit 4 is controlled by auxiliary switch Q2Drive signal remain high electricity
It is flat, auxiliary switch Q2Realize that no-voltage is open-minded, as clamp capacitor CCDuring the voltage increase at two ends, primary inductor LPPass through second
Diode DQ2For clamp capacitor CCCharging, the second diode DQ2Conducting, auxiliary switch Q2Voltage between hourglass source electrode is zero；Control
Drive 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 amplify
Main switch Q is driven afterwards1With auxiliary switch Q2, DC voltage, the main switch Q exported for 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 road isolated form DC-DC boost converter the course of work include with
Next stage：
t0-t1Period：In t0Moment, main switch Q1Driving voltage Ugs1It is changed into high level, now primary inductor LPElectricity
It is negative to flow, main switch Q1It is not turned on, primary inductor LPPass through the first diode DQ1With electric capacity CiAfterflow, main switch Q1Drain-source
The voltage of interpolar is zero, to t1Moment, primary inductor LPElectric current be changed into 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, to t2Moment,
Main switch Q1Driving voltage Ugs1It is changed into low level, main switch Q1Shut-off；
t2-t3Period：Resonant capacitance CrFor primary inductor LPCharging, primary inductor LPElectric current continue increase, to 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
Electric capacity CrVoltage add electric capacity CiVoltage be less than clamp capacitor CCVoltage, the second diode DQ2Reversely cut-off, to t4When
Carve, resonant capacitance CrVoltage add electric capacity CiVoltage be more 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, to t5Moment, auxiliary switch Q2Driving voltage Ugs2It is changed into high level, but primary inductor LPElectric current still for just,
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, to t6Moment, primary inductor LPElectric current drop 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 LPReverse charging, to t7Moment, auxiliary
Switching tube Q2Driving voltage Ugs2It is changed into low level, auxiliary switch Q2Shut-off, clamp capacitor CCStop as primary inductor LPFill
Electricity；
t7-t8Period：Resonant capacitance CrVoltage reduction, primary inductor LPElectric current reduce, to t8Moment, resonant capacitance Cr
Voltage be changed into 0；
t8-t9Period：Primary inductor LPFor former resonant capacitance CrReverse charging, resonant capacitance CrVoltage gradually increase, arrive
t9Moment, resonant capacitance CrVoltage increase to and electric capacity CiVoltage it is equal；
t9-t10Period：Primary inductor LPPass through the first diode DQ1With electric capacity CiAfterflow, to t10Moment, main switch Q1
Driving voltage Ugs1It is changed into high level, now primary inductor LPElectric current be negative, main switch Q1It is not turned on.
Claims (2)
1. a kind of band pulls down the isolated form DC-DC boost converter control method of active clamp branch road, it is characterised in that：Using band
The isolated form DC-DC boost converter for pulling down active clamp branch road realizes that specific control process comprises the following steps：
(1) it is electric on circuit, SCM program initialization：Pulse width modulation soft start is first used, that is, gives main switch and auxiliary
Switching tube original switching frequency is helped, maintained switch frequency is constant, ON time is gradually increased to setting value, converter output voltage
Reach setting voltage；
(2) when converter output voltage is unstable, main switch and auxiliary is controlled to open by pulse frequency modulated control method
The switching frequency of pipe is closed, stabilization transform device output voltage detects converter output voltage signal simultaneously at first voltage test point
Control drive circuit is sent to, drive circuit is controlled according to the switching frequency of the change adjustment circuit of converter output voltage, if
Converter output voltage becomes big, and control drive circuit sends increase main switch, the signal of auxiliary switch switching frequency；If becoming
Parallel operation output voltage reduces, and control drive circuit sends reduction main switch, the signal of auxiliary switch switching frequency, so that surely
Determine converter output voltage；The no-voltage of main switch is opened by detecting that switching tube opens its preceding leakage at second voltage test point
Whether the voltage between source electrode is zero, controls the driving pulse width of main switch to realize by PWM control methods, in main switch
Manage before current drive signal rising edge arrival, the voltage of main switch drain-source interpolar is detected at second voltage test point, if
The voltage of main switch drain-source interpolar is not zero, then to be not carried out no-voltage open-minded for main switch, and control drive circuit is next
Reduce the driving pulse width of main switch during secondary output drive signal；If the voltage of main switch drain-source interpolar is zero, lead
Switching tube realizes that no-voltage is open-minded, and control drive circuit keeps the driving pulse of main switch in output drive signal next time
Width is constant；The no-voltage of auxiliary switch open by the voltage that detects clamp capacitor two ends at tertiary voltage test point whether
Change, realized by interrupting, when the voltage increment that clamp capacitor two ends are detected at tertiary voltage test point is not zero,
Into interruption, the drive signal of auxiliary switch is remained high level by control drive circuit, and auxiliary switch realizes no-voltage
It is open-minded；When the voltage increment that clamp capacitor two ends are detected at tertiary voltage test point is zero, control drive circuit will be auxiliary
The drive signal of switching tube is helped to remain low level；
(3) judge whether converter needs to be stopped, if converter needs to be stopped, stop output main switch and auxiliary
Help the drive signal of switching tube；If converter need not be stopped, 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 road, it is special
Levy and be：On the basis of single-ended reverse exciting type circuit topology, in its transformer primary side parallel resonance electric capacity, in main switch drain-source
Two ends parallel connection drop-down active clamp branch road, high frequency voltage-multiplying circuit, resonant capacitance and transformer in parallel are cascaded in transformer secondary
Primary side inductance carries out resonance, and concrete structure includes input voltage, electric capacity, resonant capacitance, high frequency transformer, main switch, first
Diode, drop-down active clamp branch road, high frequency voltage-multiplying circuit, equivalent load and control drive circuit；Opened based on first diode
The anti-paralleled diode of pipe is closed, input voltage is after capacitor filtering, by main switch, the first diode and drop-down active clamp
Branch road is by DC inverter into high-frequency alternating current, and high-frequency alternating current is applied to the two ends of primary side inductance, the sensing of secondary inductance two ends
Go out high-frequency ac voltage, and powered 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 up of the electrical connection of primary side inductance, secondary inductance and magnetic core, and wherein magnetic core is the magnetic core with air gap, its
The coefficient of coup is 0.5-0.95, and energy is delivered to secondary, main switch, by high frequency transformer and resonant capacitance from primary side together
One diode and drop-down active clamp branch road are used to realize electric energy inversion, drop-down active clamp branch route auxiliary switch, second
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 band, the ON time of auxiliary switch is shorter, is lost smaller；First commutation diode, the second commutation diode, the first filter
Ripple electric capacity and the second filter capacitor electrical connection composition high frequency voltage-multiplying circuit, for carrying out rectification, filtering to high-frequency alternating current, simultaneously
Powered for equivalent load, equivalent load is capacitive load or inductive load, the straight of converter is detected at first voltage test point
Output voltage is flowed, and the VD detected is delivered into control drive circuit, master is detected at second voltage test point
Voltage between switching tube hourglass source electrode, and the voltage detected is delivered into control drive circuit, currently drive letter in main switch
Before number rising edge arrives, by detecting whether the voltage of main switch drain-source interpolar is zero to judge whether current main switch is real
Existing no-voltage is open-minded；The voltage at clamp capacitor two ends is detected at tertiary voltage test point, and the voltage detected is delivered into control
Drive circuit processed, when detecting the voltage increase at clamp capacitor two ends, control drive circuit believes the driving of auxiliary switch
Number high level is remained, auxiliary switch realizes that no-voltage is open-minded, when the voltage increase at clamp capacitor two ends, primary side inductance leads to
Cross the second diode to charge for clamp capacitor, the second diode current flow, the voltage between auxiliary switch hourglass source electrode is zero；Control
Drive circuit receives the voltage letter detected at 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, the DC voltage exported for stabilization transform device, the no-voltage of main switch open control, auxiliary switch
The no-voltage of pipe opens control.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109245569A (en) * | 2018-09-18 | 2019-01-18 | 西安矽力杰半导体技术有限公司 | Inverse excitation type converter and its control circuit |
| CN110967552A (en) * | 2019-12-20 | 2020-04-07 | 上海贝岭股份有限公司 | Detection circuit for output voltage of charge pump and EEPROM |
| CN112769320A (en) * | 2021-01-04 | 2021-05-07 | 南京博兰得电子科技有限公司 | Clamp switch driving circuit |
| CN113489310A (en) * | 2021-06-11 | 2021-10-08 | 深圳英飞源技术有限公司 | Frequency conversion control method and device of DC-DC converter |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1713495A (en) * | 2004-06-25 | 2005-12-28 | 台达电子工业股份有限公司 | Driving circuit for DC/DC converter voltage and level transferring method |
| CN102122890A (en) * | 2010-10-11 | 2011-07-13 | 南京航空航天大学 | Control method for auxiliary switching tube of active clamp flyback converter |
| CN203135738U (en) * | 2013-03-28 | 2013-08-14 | 厦门翰普电子有限公司 | Structure of LC resonant power supply |
| US8699237B2 (en) * | 2012-05-30 | 2014-04-15 | National Tsing Hua University | Soft-switching inverter utilizing high step up ratio circuit with active clamping |
| CN104300795A (en) * | 2014-10-11 | 2015-01-21 | 广州金升阳科技有限公司 | Flyback converter and control method of flyback converter |
-
2017
- 2017-05-31 CN CN201710400452.2A patent/CN107017779B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1713495A (en) * | 2004-06-25 | 2005-12-28 | 台达电子工业股份有限公司 | Driving circuit for DC/DC converter voltage and level transferring method |
| CN102122890A (en) * | 2010-10-11 | 2011-07-13 | 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 |
| CN104300795A (en) * | 2014-10-11 | 2015-01-21 | 广州金升阳科技有限公司 | Flyback converter and control method of flyback converter |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109245569A (en) * | 2018-09-18 | 2019-01-18 | 西安矽力杰半导体技术有限公司 | Inverse excitation type converter and its control circuit |
| 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 |
| US11018590B2 (en) | 2018-09-18 | 2021-05-25 | Silergy Semiconductor Technology (Hangzhou) Ltd | Control circuit for a flyback converter |
| US11671020B2 (en) | 2018-09-18 | 2023-06-06 | Silergy Semiconductor Technology (Hangzhou) Ltd | Flyback converter, control circuit and control method thereof |
| CN110967552A (en) * | 2019-12-20 | 2020-04-07 | 上海贝岭股份有限公司 | Detection circuit for output voltage of charge pump and EEPROM |
| 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 |
| CN112769320A (en) * | 2021-01-04 | 2021-05-07 | 南京博兰得电子科技有限公司 | Clamp switch driving circuit |
| CN113489310A (en) * | 2021-06-11 | 2021-10-08 | 深圳英飞源技术有限公司 | Frequency conversion control method and device of DC-DC converter |
| 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 |
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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 |
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