CN108923659A - DC-DC converter and its control method and control circuit, storage medium - Google Patents
DC-DC converter and its control method and control circuit, storage medium Download PDFInfo
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- CN108923659A CN108923659A CN201810788537.7A CN201810788537A CN108923659A CN 108923659 A CN108923659 A CN 108923659A CN 201810788537 A CN201810788537 A CN 201810788537A CN 108923659 A CN108923659 A CN 108923659A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
-
- 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
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention discloses a kind of DC-DC converter and its control method and control circuit, storage medium.The DC-DC converter includes：Main switch, auxiliary switch, rectification circuit and the first resonance circuit, wherein：Auxiliary switch is connect with main switch；Rectification circuit is connect with auxiliary switch；First resonance circuit is connect with main switch, auxiliary switch and rectification circuit respectively, the first resonance circuit, open-minded for controlling main switch no-voltage.The present invention uses soft switch technique, reduces because using hard switching technology bring loss problem, capacitive to open problem, perceptual shutdown problem, while also can solve the electromagnetic interference problem as caused by hardware switch process.
Description
Technical field
The present invention relates to voltage changer field, in particular to a kind of DC-DC converter and its control method and control
Circuit processed, storage medium.
Background technique
In order to reduce the volume and weight of DC-DC (DC-DC) converter, it is necessary to realize high frequency, but improve and open
Close frequency therewith bring be switching loss increase.
Hard switching refers to switching tube when opening or turning off, and the voltage (or electric current) on device is not equal to zero, that is, forces
Device turns off at this moment, therefore voltage, electric current are not zero in switching process, overlapping occurs, there is the switch of highly significant
Loss；Meanwhile because switching frequency is excessively high, the rate of change of voltage and electric current is also quickly, it may appear that apparent overshoot phenomenon, from
And generate switching noise.
Summary of the invention
In view of the above technical problem, the present invention provides a kind of DC-DC converter and its control methods and control electricity
Road, storage medium reduce switching loss caused by hard switching technology and electromagnetic interference using soft switch technique.
According to an aspect of the present invention, a kind of DC-DC converter, including main switch, auxiliary switch, rectification are provided
Circuit and the first resonance circuit, wherein：
Auxiliary switch is connect with main switch；
Rectification circuit is connect with auxiliary switch；
First resonance circuit is connect with main switch, auxiliary switch and rectification circuit respectively, the first resonance circuit, for controlling
Main switch no-voltage is open-minded.
In some embodiments of the invention, first resonance circuit includes the first resonant capacitance and the first resonance electricity
Sense, wherein：
The first port of main switch is connect with DC supply input, and the second of the second port of main switch and auxiliary switch
Port connection, the first port of auxiliary switch are connected with the rectifying circuit；
The first port of first resonant capacitance and the first port of main switch connect, the second port of the first resonant capacitance with
The second port of main switch connects；
The first port of first resonant inductance and the second port of auxiliary switch connect, the second port of the first resonant inductance
It is connected with the rectifying circuit.
In some embodiments of the invention, first resonance circuit further includes in first diode and the second diode
At least one, wherein：
The anode of first diode is connect with the second port of main switch, and the first of the cathode of first diode and main switch
Port connection；
The anode of second diode is connect with the second port of the first resonant inductance, and cathode and the auxiliary of the second diode are opened
The first port of pass connects.
In some embodiments of the invention, the rectification circuit includes synchronous rectifier, wherein：
The first port of synchronous rectifier is connect with auxiliary switch, the second port ground connection of synchronous rectifier.
In some embodiments of the invention, the DC-DC converter further includes that the second resonant capacitance and second are humorous
Shake inductance, wherein：
The first port of second resonant capacitance is connect with voltage output end, the second port ground connection of the second resonant capacitance；
The first port of second resonant inductance and the first port of synchronous rectifier connect, the second end of the second resonant inductance
Mouth is connect with voltage output end.
In some embodiments of the invention, the DC-DC converter further includes the first driving circuit, the second driving
At least one of in circuit and third driving circuit, wherein：
First driving circuit is connect with main switch, for driving the turn-on and turn-off of main switch；
Second driving circuit is connect with auxiliary switch, for driving the turn-on and turn-off of auxiliary switch；
Third driving circuit is connect with synchronous rectifier, for driving the turn-on and turn-off of synchronous rectifier.
In some embodiments of the invention, the DC-DC converter further includes control circuit, wherein：
Control circuit is connect with the first driving circuit, the second driving circuit and third driving circuit respectively, is used for first
Driving circuit, the second driving circuit and third driving circuit send control signal, with control main switch, auxiliary switch with it is synchronous whole
The conducting and shutdown of flow tube.
In some embodiments of the invention, the DC-DC converter further includes transformer and the first detection voltage
Conditioning circuit, wherein：
Transformer includes armature winding and secondary windings, wherein the armature winding of transformer is second resonant inductance；
The first port of transformer secondary output winding is connect with the first detection voltage conditioning circuit, and the of transformer secondary output winding
Two-port netwerk ground connection；
First detection voltage conditioning circuit connects to the control circuit；
First detection voltage conditioning circuit, for carrying out corresponding Shape correction to detection voltage, so that control circuit is direct
Receive corresponding signal.
In some embodiments of the invention, the DC-DC converter further includes bleeder circuit and the second detection electricity
Conditioning circuit is pressed, wherein：
Bleeder circuit includes the first divider resistance and the second divider resistance；
The first port of first divider resistance is connect with voltage output end, the first port of the first divider resistance with second point
The first port of piezoresistance connects, the second port ground connection of the second divider resistance；
First detection voltage conditioning circuit is connect with the first port of the second divider resistance；
Second detection voltage conditioning circuit, for carrying out corresponding Shape correction to detection voltage, so that control circuit is direct
Receive corresponding signal.
In some embodiments of the invention, the DC-DC converter further includes filter circuit, wherein：
One end of filter circuit is connect with DC supply input, the other end ground connection of filter circuit.
In some embodiments of the invention, the DC-DC converter be buck converter, boost converter,
Any transformation device in buck-boost converter, non-isolation type converter and isolated converter.
In some embodiments of the invention, the DC-DC converter is forward converter, flyback converter, half
Any transformation device in bridging parallel operation, push-pull converter and full-bridge converter.
In some embodiments of the invention, the main switch is field-effect tube, IGBT, any device in triode.
In some embodiments of the invention, the auxiliary switch is field-effect tube, IGBT, any device in triode
Part.
In some embodiments of the invention, the synchronous rectifier is field-effect tube, IGBT, any device in triode
Part.
According to another aspect of the present invention, a kind of control method of DC-DC converter, the DC-DC are provided
Converter is DC-DC converter as described in above-mentioned any embodiment, wherein the control method includes：
Original state before carving at the beginning controls main switch and auxiliary switch conducting, control rectification circuit shutdown；
It carves at the beginning, control main switch no-voltage disconnects；
After the first predetermined time interval after carving at the beginning, control rectification circuit is open-minded.
In some embodiments of the invention, the control method further includes：
After the second predetermined time interval that synchronous rectifier is opened, control auxiliary switch realizes zero voltage turn-off；
After auxiliary switch shutdown, the first resonance circuit of control enters harmonic period, wherein the length of harmonic period is the
Three predetermined time intervals.
In some embodiments of the invention, the control method further includes：
After harmonic period, it is open-minded to control switch tube zero voltage；
After switch tube zero voltage is opened, after the 4th predetermined time interval after harmonic period, rectified current is controlled
Road zero-current switching, so that current DC-DC converter returns to original state.
In some embodiments of the invention, the control method further includes：
As initial time at the time of after the 5th predetermined time interval after setting rectification circuit zero-current switching, execute first
Begin the moment, controls the step of main switch no-voltage disconnects.
According to another aspect of the present invention, a kind of control circuit of DC-DC converter, the DC-DC are provided
Converter is the DC-DC converter as described in above-mentioned any embodiment, wherein：
Control circuit controls main switch and auxiliary switch conducting, controls whole for the original state before carving at the beginning
Current circuit shutdown；It carves at the beginning, control main switch no-voltage disconnects；After the first predetermined time interval after carving at the beginning,
It is open-minded to control rectification circuit.
In some embodiments of the invention, the control circuit is realized as described in above-mentioned any embodiment for executing
The operation of the control method of DC-DC converter.
According to another aspect of the present invention, a kind of control circuit of DC-DC converter, including memory and place are provided
Device is managed, wherein：
Memory, for storing instruction；
Processor, for executing described instruction, so that described device execution realization is straight as described in above-mentioned any embodiment
The operation of stream-DC converter control method.
According to another aspect of the present invention, a kind of computer readable storage medium, the computer-readable storage medium are provided
Matter is stored with computer instruction, and the DC-DC as described in above-mentioned any embodiment is realized when described instruction is executed by processor
The control method of converter.
The present invention uses soft switch technique, reduces because using hard switching technology bring loss problem, capacitive to open and ask
Topic, perceptual shutdown problem, while also can solve the electromagnetic interference problem as caused by hardware switch process.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the schematic diagram of some embodiments of DC-DC converter of the present invention.
Fig. 2 is the schematic diagram of other embodiments of DC-DC converter of the present invention.
Fig. 3 is the schematic diagram of some embodiments of control method of DC-DC converter of the present invention.
Fig. 4 is the work wave schematic diagram of DC-DC converter in some embodiments of the invention.
Fig. 5 is the schematic diagram of some embodiments of control circuit of DC-DC converter of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Below
Description only actually at least one exemplary embodiment be it is illustrative, never as to the present invention and its application or make
Any restrictions.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, shall fall within the protection scope of the present invention.
Unless specifically stated otherwise, positioned opposite, the digital table of the component and step that otherwise illustrate in these embodiments
It is not limited the scope of the invention up to formula and numerical value.
Simultaneously, it should be appreciated that for ease of description, the size of various pieces shown in attached drawing is not according to reality
Proportionate relationship draw.
Technology, method and apparatus known to person of ordinary skill in the relevant may be not discussed in detail, but suitable
In the case of, the technology, method and apparatus should be considered as authorizing part of specification.
It is shown here and discuss all examples in, any occurrence should be construed as merely illustratively, without
It is as limitation.Therefore, the other examples of exemplary embodiment can have different values.
It should be noted that：Similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, then in subsequent attached drawing does not need that it is further discussed.
Fig. 1 is the schematic diagram of some embodiments of DC-DC converter of the present invention.As shown in Figure 1, the DC-DC
Converter may include main switch T1, auxiliary switch T2, rectification circuit 1 and the first resonance circuit, wherein：
Auxiliary switch T2 is connect with main switch T1.
Rectification circuit 1 is connect with auxiliary switch T2.
First resonance circuit is connect with main switch T1, auxiliary switch T2 and rectification circuit 1 respectively, the first resonance circuit, is used
It is open-minded in the no-voltage of control main switch T1.
Auxiliary switch T2, for adjusting whether output voltage and control resonance occur, auxiliary switch T2 only is needing to switch
Just start resonance circuit when state changes, causes the condition of main switch T1 zero voltage switch.
Based on the DC-DC converter that the above embodiment of the present invention provides, soft switch technique is used, is solved because making
Problem, perceptual shutdown problem are opened with hard switching technology bring loss problem, capacitive, while also can solve by hardware switch mistake
Electromagnetic interference problem caused by journey.
The switch controlled that an auxiliary is added in the above embodiment of the present invention on the basis of quasi-resonance type translation circuit is humorous
The resonant process of vibration element, only just starts resonance circuit when needing switch state transitions, causes the no-voltage of switching tube
It opens or zero-current switching condition.
In some embodiments of the invention, as shown in Figure 1, first resonance circuit may include the first resonant capacitance
Cr and the first resonant inductance Lr, wherein：
The first port of main switch T1 is connect with DC supply input, the second port and auxiliary switch T2 of main switch T1
Second port connection, the first port of auxiliary switch T2 connect with rectification circuit 1.
The first port of first resonant capacitance Cr is connect with the first port of main switch T1, and the second of the first resonant capacitance Cr
Port is connect with the second port of main switch T1；
The first port of first resonant inductance Lr is connect with the second port of auxiliary switch T2, and the of the first resonant inductance Lr
Two-port netwerk is connect with rectification circuit 1.
Soft switch circuit is actually to carry out shaping using inductance and capacitor come the track to switch, it applies the original of resonance
Reason makes the voltage (or electric current) of switch element by sinusoidal rule variation, and when voltage is zero, element ON is (when electric current nature mistake
Cut-off device when zero), to reduce switching loss.Sofe Switch not only can solve loss problem, the capacitive of hard switching in circuit
Problem, perceptual shutdown problem and diode reverse recovery problem are opened, while also can solve the electricity as caused by hardware switch process
Magnetic disturbance problem.
It is found by the applicant that：Rectification circuit is usually rectified using the unilateral conduction of rectifier diode, and rectification circuit is
A kind of passive device.It is open-minded as long as having enough forward voltage rectifier diodes, without other control circuit, but it is whole
It is higher to flow diode conduction voltage drop, SRD (Ultrafast recovery diode) or the reachable 1V to 1.2V of FRD (fast recovery diode), even if
The pressure drop of about 0.6V can be also generated using SBD (Schottky diode of low pressure drop), what which did is idle work, in low pressure
Rectifier diode loss is quite serious under the operating condition of high current, this will lead to power-efficient reduction, and the thermal energy that generation is lost is led
Causing the temperature of rectifying tube, Switching Power Supply and system entirety can rise, to will lead to, system operation is unstable, and service life reduces
The problems such as.
Based on this, the rectification circuit 1 of the further Fig. 1 embodiment of applicant is selected as synchronous rectifier, specific as Fig. 2 is implemented
Shown in example.
Fig. 2 is the schematic diagram of other embodiments of DC-DC converter of the present invention.Compared with Fig. 1 embodiment, Fig. 2 is real
It applies in example, the rectification circuit 1 can be synchronous rectifier T3, wherein：
The first port of synchronous rectifier T3 is connect with auxiliary switch T2, the second port ground connection of synchronous rectifier T3.
The above embodiment of the present invention is reduced because using the loss of conventional rectifier circuit bring and problem of temperature rise, improves change
The transfer efficiency of parallel operation.
An auxiliary switch is added in the above embodiment of the present invention on the basis of quasi-resonance type translation circuit, to control resonance
The resonant process of element only just starts resonance circuit when needing switch state transitions, the no-voltage of switching tube is caused to open
Logical or zero-current switching condition, while synchronous rectification is used, DC-DC converter switching loss can be reduced, improve effect
Rate.
What the no-voltage that the above embodiment of the present invention is mainly used for control main power tube was opened, while can also make to assist
Switching tube zero voltage turn-off, while synchronous rectifier T3 can also realize Sofe Switch by numerical control.
In some embodiments of the invention, the DC-DC converter of Fig. 1 and Fig. 2 embodiment can convert for buck
Device (decompression transducer), boost converter (boost inverter), buck-boost converter (step-down/up type converter),
Any transformation device in the converters such as non-isolation type converter and isolated converter.
In some embodiments of the invention, the DC-DC converter of Fig. 1 and Fig. 2 embodiment can be forward conversion
Any transformation device in the converters such as device, flyback converter, half-bridge converter, push-pull converter and full-bridge converter.
In some embodiments of the invention, the main switch T1 can for FET (Field Effect Transistor,
Field effect transistor, i.e. field-effect tube), IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar
Transistor), appointing in the transistors such as BJT (Bipolar Junction Transistor, bipolar junction transistor, i.e. triode)
One device.
In some embodiments of the invention, the auxiliary switch T2 can be the crystal such as field-effect tube, IGBT, triode
Any device in pipe.
In some embodiments of the invention, the synchronous rectifier T3 can be the crystalline substances such as field-effect tube, IGBT, triode
Any device in body pipe.
In some embodiments of the invention, as depicted in figs. 1 and 2, first resonance circuit can also include first
At least one of diode D1 and the second diode D2, wherein：
The anode of first diode D1 is connect with the second port of main switch T1, the cathode and main switch of first diode D1
The first port of T1 connects；
Second diode D2 anode connect with the second port of the first resonant inductance Lr, the cathode of the second diode D2 and
The first port of auxiliary switch T2 connects.
Diode D1 and D2 in the above embodiment of the present invention constitutes continuous current circuit for different moments.
In some embodiments of the invention, as depicted in figs. 1 and 2, the DC-DC converter can also include the
Two resonant capacitance Cf and the second resonant inductance Lf, wherein：
The first port of second resonant capacitance Cf is connect with voltage output end U0, and the second port of the second resonant capacitance Cf connects
Ground.
The first port of second resonant inductance Lf is connect with the first port of synchronous rectifier T3, the second resonant inductance Lf's
Second port is connect with voltage output end U0.
In the above embodiment of the present invention, Lf and Cf are for forming quasi-resonance network, to realize Sofe Switch；Wherein Lf is used for
Load current is born when opening.
In some embodiments of the invention, as depicted in figs. 1 and 2, the DC-DC converter can also include the
At least one of in one drive circuit 21, the second driving circuit 22 and third driving circuit 23, wherein：
First driving circuit 21 is connect with main switch T1, for driving the turn-on and turn-off of main switch T1.
Second driving circuit 22 is connect with auxiliary switch T2, for driving the turn-on and turn-off of auxiliary switch T2.
Third driving circuit 23 is connect with synchronous rectifier T3, for driving the turn-on and turn-off of synchronous rectifier T3.
In some embodiments of the invention, the drive waveforms of main switch T1, auxiliary switch T2 and synchronous rectifier T3 are equal
It can be PWM (Pulse Width Modulation, pulse width modulation) form.
In some embodiments of the invention, as depicted in figs. 1 and 2, the DC-DC converter can also include control
Circuit 3 processed, wherein：
Control circuit 3 is connect with the first driving circuit 21, the second driving circuit 22 and third driving circuit 23 respectively, is used for
Control signal is sent to the first driving circuit 21, the second driving circuit 22 and third driving circuit 23, to control main switch T1, auxiliary
Help the conducting and shutdown of switch T2 and synchronous rectifier T3.
In some embodiments of the invention, as depicted in figs. 1 and 2, the DC-DC converter can also include becoming
Depressor and the first detection voltage conditioning circuit 41, wherein：
Transformer includes armature winding (primary side winding) and secondary windings (vice-side winding), wherein transformer it is primary around
Group is the second resonant inductance Lf.
The first port of transformer secondary output winding is connect with the first detection voltage conditioning circuit 41, transformer secondary output winding
Second port ground connection.
The effect of primary side winding is energy storage inductor in the above embodiment of the present invention, and vice-side winding is for isolation detection primary side
Winding both end voltage.
In some embodiments of the invention, as depicted in figs. 1 and 2, the first detection voltage conditioning circuit 41 and control electricity
Road 3 connects.
First detection voltage conditioning circuit 41, for carrying out corresponding Shape correction to detection voltage, so that control circuit 3 is straight
Reception corresponding signal.
In some embodiments of the invention, as depicted in figs. 1 and 2, the DC-DC converter can also include point
Volt circuit and the second detection voltage conditioning circuit 42, wherein：
Bleeder circuit includes the first divider resistance and the second divider resistance.
The first port of first divider resistance is connect with voltage output end Uo, the first port of the first divider resistance and second
The first port of divider resistance connects, the second port ground connection of the second divider resistance.
First detection voltage conditioning circuit 41 is connect with the first port of the second divider resistance.
Second detection voltage conditioning circuit 42, for carrying out corresponding Shape correction to detection voltage, so that control circuit 3 is straight
Reception corresponding signal.
In some embodiments of the invention, as depicted in figs. 1 and 2, the DC-DC converter can also include filter
Wave circuit 5, wherein：
One end of filter circuit 5 is connect with DC supply input, the other end ground connection of filter circuit 5.
Filter circuit 5, for being filtered to the direct current of input.
In the above embodiment of the present invention, above-mentioned input dc power can be dc-battery, be also possible to photovoltaic generation
The input voltage or electric current of voltage or other DC suppling equipments.
How main switch T1, auxiliary are controlled to control circuit 3 in the above embodiment of the present invention below by specific embodiment
The on-off of switch T2 and synchronous rectifier T3 are further described.
Fig. 3 is the schematic diagram of some embodiments of control method of DC-DC converter of the present invention.Preferably, this implementation
Example can be executed by the control circuit of DC-DC converter of the present invention.
Fig. 4 is the work wave schematic diagram of DC-DC converter in some embodiments of the invention.In Fig. 4 embodiment,
Ug1 is the drive waveforms of T1 pipe；Ug2 is the drive waveforms of T2 pipe；UCr is resonant capacitance Cr both end voltage；IL is to flow through first
The electric current of resonant inductance Lr；IT1 is the electric current for flowing through T1；UL is the voltage at the first both ends resonant inductance Lr；UD is synchronous rectification
The voltage at the both ends pipe T3；Ts is switch periods；Io is output electric current.
In some embodiments of the invention, as shown in Figure 3 and Figure 4, the control method of DC-DC converter of the present invention
May include：
Step 30, the original state before t0 is carved at the beginning, is controlled main switch T1 and auxiliary switch T2 conducting, is controlled whole
Current circuit 1 (being specifically as follows synchronous rectifier T3) shutdown.
In some embodiments of the invention, work as t<When t0, main switch T1 and auxiliary switch T2 are conductings, are synchronized whole
Flow tube T3 cut-off, iL=If=Io, resonant capacitance Cr both end voltage are that zero, Io is output electric current.
In a switch periods Ts, five stages can be divided to analyze the course of work：
First stage：t0<t<t1
Step 31, it carves at the beginning, control main switch T1 no-voltage disconnects.
In t=t0, the first resonant capacitance Cr both end voltage is zero, and the driving signal Ug1 for removing main switch T1 makes T1 zero
Voltage shutdown, electric current are transferred to Cr from T1 immediately, charge to resonant capacitance, since iL=If=Io is constant, resonant capacitance both ends
Voltage UCr<When Ud, synchronous rectifier T3 is still in off state.
Step 32, after the first predetermined time interval (t1-t0) after carving at the beginning, that is, as t=t1, resonant capacitance
Both end voltage is charged to UCr=Ud, control synchronous rectifier T3 terminate off state to opening state and it is conductive, wherein Ud is
Input voltage.
Second stage：t1<t<t2
Step 33, after the second predetermined time interval (t2-t1) that synchronous rectifier T3 is opened, control auxiliary switch T2 pipe
Realize zero voltage turn-off.
In some embodiments of the invention, continuous through auxiliary switch T2 and diode D2 after synchronous rectifier T3 is conductive
Stream, this period (the second predetermined time interval) are can be controlled by changing the shutdown moment t2 of auxiliary switch T2.Thus
It can be produced by the voltage that divider resistance detects by digitial controller when turn-on time, that is, duty ratio of synchronous rectification diode
Raw pwm signal come implement control, the voltage Uo of output is regulated and controled with it.
Phase III：t2<t<t3
Step 34, after the shutdown of auxiliary switch T2 pipe, the first resonance circuit of control enters harmonic period, wherein resonance week
The length of phase is third predetermined time interval (t3-t2).
In the phase III, turned off due to removing the driving signal of auxiliary switch T2 in t=t2, resonant capacitance Cr with it is humorous
The inductance Lr that shakes generates resonance.The moment before T2 is turned off, since power tube T1 has been turned off, UCr=Ud, so auxiliary switch T2 is zero
Voltage shutdown.
When in some embodiments of the invention, from harmonic period of the t=t2 moment to 1/4, resonant capacitance both end voltage
UCr has reached maximum value Ud+IoZr, and hereafter capacitor Cr discharges, and UCr decline, when arriving t=t3, the electric current iL during this is
Negative value, wherein Zr is the impedance of resonance circuit, and size is
Fourth stage：t3<t<t4
Step 35, after harmonic period, it is open-minded to control switch tube zero voltage.
In some embodiments of the invention, the synchronized rectifying tube T3 of negative current iL, diode D1 are to power supply Ud feedback energy
Amount.Since the D1 of conducting is in parallel with master power switch pipe T1, if applying driving signal to T1 during this period, T1 will be in no-voltage
Under it is open-minded.
Step 36, after switch tube zero voltage is opened, after the 4th predetermined time interval after harmonic period, control
1 zero-current switching of rectification circuit, so that current DC-DC converter returns to original state (t<State when t0).
In some embodiments of the invention, T1 opens rear negative current iL reversely from zero linear increase, iL=when arriving t=t4
The electric current IT3=iL=Io of Io, synchronous rectifier T3 are reduced to zero and zero-current switching from Io.
5th stage：t4<t<t5
Step 37, as initial time at the time of after the 5th predetermined time interval after setting 1 zero-current switching of rectification circuit,
Step 31 is executed later.
In t=t4, current DC-DC converter returns to original state.Master power switch pipe T1 is in opening state,
Synchronous rectifier T3 be off state, power supply Ud to load constant current-supplying.
In t=t5, turn off the driving signal of T1, UCr=UT1 very little when because of shutdown, so T1 is also soft switching, in turn
Complete a switch periods Ts.
Control method based on the DC-DC converter that the above embodiment of the present invention provides converts electricity in quasi-resonance type
On the basis of road be added an auxiliary switch, to control the resonant process of resonant element, only need switch state transitions when
It waits and just starts resonance circuit, the no-voltage of switching tube is caused to open or zero-current switching condition, while using synchronous rectification,
DC-DC converter switching loss can be reduced, improved efficiency.
What the no-voltage that the above embodiment of the present invention is mainly used for control main power tube was opened, while can also make to assist
Switching tube zero voltage turn-off, while synchronous rectifier T3 can also realize Sofe Switch by numerical control.
According to another aspect of the present invention, a kind of control circuit 3 of DC-DC converter, the DC-DC are provided
Converter is the DC-DC converter as described in above-mentioned any embodiment, wherein：
Control circuit 3 controls main switch T1 and auxiliary switch conducting, control for the original state before carving at the beginning
Rectification circuit 1 processed turns off；It carves at the beginning, so that main switch T1 no-voltage disconnects；The first predetermined time after carving at the beginning
Behind interval, control rectification circuit 1 is open-minded.
In some embodiments of the invention, the control circuit 3 for execute realize as above-mentioned any embodiment (such as
Fig. 3 or Fig. 4 embodiment) described in DC-DC converter control method operation.
Fig. 5 is the schematic diagram of some embodiments of control circuit of DC-DC converter of the present invention.As shown in figure 5, this hair
The control circuit (such as control circuit 3 of Fig. 1 or Fig. 2 embodiment) of bright DC-DC converter may include 31 He of memory
Processor 32, wherein：
Memory 31, for storing instruction.
Processor 32, for executing described instruction, so that described device execution realization such as above-mentioned any embodiment (such as scheme
3 or Fig. 4 embodiment) described in DC-DC converter control method operation.
Control circuit based on the DC-DC converter that the above embodiment of the present invention provides converts electricity in quasi-resonance type
On the basis of road be added an auxiliary switch, to control the resonant process of resonant element, only need switch state transitions when
It waits and just starts resonance circuit, the no-voltage of switching tube is caused to open or zero-current switching condition, while using synchronous rectification,
DC-DC converter switching loss can be reduced, improved efficiency.
According to another aspect of the present invention, a kind of computer readable storage medium, the computer-readable storage medium are provided
Matter is stored with computer instruction, is realized when described instruction is executed by processor as (such as Fig. 3 or Fig. 4 are real for above-mentioned any embodiment
Apply example) described in DC-DC converter control method.
Computer readable storage medium based on the DC-DC converter that the above embodiment of the present invention provides only is needing
Just start resonance circuit when wanting switch state transitions, causes the no-voltage of switching tube to open or zero-current switching condition, together
Shi Caiyong synchronous rectification can reduce DC-DC converter switching loss, improve efficiency.
The above embodiment of the present invention is reduced because using hard switching technology bring loss problem, capacitive to open problem, sense
Property shutdown problem, while also can solve the electromagnetic interference problem as caused by hardware switch process；The above embodiment of the present invention reduces
Because using conventional rectifier circuit bring to be lost and problem of temperature rise, the transfer efficiency of converter is improved.
Control circuit described above can be implemented as main control chip for executing function described herein, logical
It can with processor, programmable logic controller (PLC) (PLC), digital signal processor (DSP), specific integrated circuit (ASIC), scene
Program gate array (FPGA) either other programmable logic device, discrete gate or transistor logic, discrete hardware components
Or it is any appropriately combined.
So far, the present invention is described in detail.In order to avoid covering design of the invention, it is public that this field institute is not described
The some details known.Those skilled in the art as described above, completely it can be appreciated how implementing technology disclosed herein
Scheme.
Those of ordinary skill in the art will appreciate that realizing that all or part of the steps of above-described embodiment can pass through hardware
It completes, relevant hardware can also be instructed to complete by program, the program can store in a kind of computer-readable
In storage medium, storage medium mentioned above can be read-only memory, disk or CD etc..
Description of the invention is given for the purpose of illustration and description, and is not exhaustively or will be of the invention
It is limited to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.It selects and retouches
It states embodiment and is to more preferably illustrate the principle of the present invention and practical application, and those skilled in the art is enable to manage
The solution present invention is to design various embodiments suitable for specific applications with various modifications.
Claims (21)
1. a kind of DC-DC converter, which is characterized in that including main switch, auxiliary switch, rectification circuit and the first resonance electricity
Road, wherein：
Auxiliary switch is connect with main switch；
Rectification circuit is connect with auxiliary switch；
First resonance circuit is connect with main switch, auxiliary switch and rectification circuit respectively, the first resonance circuit, is opened for controlling master
It is open-minded to close no-voltage.
2. DC-DC converter according to claim 1, which is characterized in that first resonance circuit includes first
Resonant capacitance and the first resonant inductance, wherein：
The first port of main switch is connect with DC supply input, the second port of main switch and the second port of auxiliary switch
Connection, the first port of auxiliary switch are connected with the rectifying circuit；
The first port of first resonant capacitance and the first port of main switch connect, and second port and the master of the first resonant capacitance open
The second port of pass connects；
The first port of first resonant inductance and the second port of auxiliary switch connect, the second port of the first resonant inductance with it is whole
Current circuit connection.
3. DC-DC converter according to claim 2, which is characterized in that first resonance circuit further includes
At least one of one diode and the second diode, wherein：
The anode of first diode is connect with the second port of main switch, the cathode of first diode and the first port of main switch
Connection；
The anode of second diode is connect with the second port of the first resonant inductance, the cathode of the second diode and auxiliary switch
First port connection.
4. DC-DC converter according to claim 1, which is characterized in that the rectification circuit is synchronous rectifier,
Wherein：
The first port of synchronous rectifier is connect with auxiliary switch, the second port ground connection of synchronous rectifier.
5. DC-DC converter according to claim 4, which is characterized in that further include the second resonant capacitance and second
Resonant inductance, wherein：
The first port of second resonant capacitance is connect with voltage output end, the second port ground connection of the second resonant capacitance；
The first port of second resonant inductance and the first port of synchronous rectifier connect, the second port of the second resonant inductance with
Voltage output end connection.
6. DC-DC converter according to claim 5, which is characterized in that further include the first driving circuit, the second drive
At least one of in dynamic circuit and third driving circuit, wherein：
First driving circuit is connect with main switch, for driving the turn-on and turn-off of main switch；
Second driving circuit is connect with auxiliary switch, for driving the turn-on and turn-off of auxiliary switch；
Third driving circuit is connect with synchronous rectifier, for driving the turn-on and turn-off of synchronous rectifier.
7. DC-DC converter according to claim 6, which is characterized in that it further include control circuit, wherein：
Control circuit is connect with the first driving circuit, the second driving circuit and third driving circuit respectively, for driving to first
Circuit, the second driving circuit and third driving circuit send control signal, to control main switch, auxiliary switch and synchronous rectifier
Conducting and shutdown.
8. DC-DC converter according to claim 7, which is characterized in that further include transformer and the first detection electricity
Conditioning circuit is pressed, wherein：
Transformer includes armature winding and secondary windings, wherein the armature winding of transformer is second resonant inductance；
The first port of transformer secondary output winding is connect with the first detection voltage conditioning circuit, the second end of transformer secondary output winding
Mouth ground connection；
First detection voltage conditioning circuit connects to the control circuit；
First detection voltage conditioning circuit, for carrying out corresponding Shape correction to detection voltage, so that control circuit directly receives
Corresponding signal.
9. DC-DC converter according to claim 7, which is characterized in that further include bleeder circuit and the second detection
Voltage conditioning circuit, wherein：
Bleeder circuit includes the first divider resistance and the second divider resistance；
The first port of first divider resistance is connect with voltage output end, the first port of the first divider resistance and the second partial pressure electricity
The first port of resistance connects, the second port ground connection of the second divider resistance；
First detection voltage conditioning circuit is connect with the first port of the second divider resistance；
Second detection voltage conditioning circuit, for carrying out corresponding Shape correction to detection voltage, so that control circuit directly receives
Corresponding signal.
10. DC-DC converter according to claim 1 to 9, which is characterized in that further include filtered electrical
Road, wherein：
One end of filter circuit is connect with DC supply input, the other end ground connection of filter circuit.
11. DC-DC converter according to claim 1 to 9, which is characterized in that
The DC-DC converter is buck converter, boost converter, buck-boost converter, non-isolation type transformation
Any transformation device in device and isolated converter.
12. DC-DC converter according to claim 1 to 9, which is characterized in that
The DC-DC converter is that forward converter, flyback converter, half-bridge converter, push-pull converter and full-bridge become
Any transformation device in parallel operation.
13. the DC-DC converter according to any one of claim 4-9, which is characterized in that
The main switch is field-effect tube, IGBT, any device in triode；
The auxiliary switch is field-effect tube, IGBT, any device in triode；
The synchronous rectifier is field-effect tube, IGBT, any device in triode.
14. a kind of control method of DC-DC converter, which is characterized in that the DC-DC converter is as right is wanted
Seek DC-DC converter described in any one of 1-13, wherein the control method includes：
Original state before carving at the beginning controls main switch and auxiliary switch conducting, control rectification circuit shutdown；
It carves at the beginning, control main switch no-voltage disconnects；
After the first predetermined time interval after carving at the beginning, control rectification circuit is open-minded.
15. control method according to claim 14, which is characterized in that further include：
After the second predetermined time interval that synchronous rectifier is opened, control auxiliary switch realizes zero voltage turn-off；
After auxiliary switch shutdown, the first resonance circuit of control enters harmonic period, wherein the length of harmonic period is that third is pre-
It fixes time interval.
16. control method according to claim 15, which is characterized in that further include：
After harmonic period, it is open-minded to control switch tube zero voltage；
After switch tube zero voltage is opened, after the 4th predetermined time interval after harmonic period, rectification circuit zero is controlled
Switch off current, so that current DC-DC converter returns to original state.
17. control method according to claim 16, which is characterized in that further include：
As initial time at the time of after the 5th predetermined time interval after setting rectification circuit zero-current switching, execute at the beginning
It carves, controls the step of main switch no-voltage disconnects.
18. a kind of control circuit of DC-DC converter, which is characterized in that the DC-DC converter is as right is wanted
DC-DC converter described in any one of 1-13 is sought, wherein：
Control circuit controls main switch and auxiliary switch conducting, controls rectified current for the original state before carving at the beginning
Road shutdown；It carves at the beginning, control main switch no-voltage disconnects；After the first predetermined time interval after carving at the beginning, control
Rectification circuit is open-minded.
19. control circuit according to claim 18, which is characterized in that the control circuit realizes such as right for executing
It is required that the operation of the control method of DC-DC converter described in any one of 14-17.
20. a kind of control circuit of DC-DC converter, which is characterized in that including memory and processor, wherein：
Memory, for storing instruction；
Processor is realized as described in any one of claim 14-17 for executing described instruction so that described device executes
The operation of the control method of DC-DC converter.
21. a kind of computer readable storage medium, which is characterized in that the computer-readable recording medium storage has computer to refer to
It enables, the control of the DC-DC converter as described in any one of claim 14-17 is realized when described instruction is executed by processor
Method processed.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810788537.7A CN108923659A (en) | 2018-07-18 | 2018-07-18 | DC-DC converter and its control method and control circuit, storage medium |
| PCT/CN2018/120961 WO2020015292A1 (en) | 2018-07-18 | 2018-12-13 | Direct current-direct current converter, control method and control circuit therefor, and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810788537.7A CN108923659A (en) | 2018-07-18 | 2018-07-18 | DC-DC converter and its control method and control circuit, storage medium |
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| CN108923659A true CN108923659A (en) | 2018-11-30 |
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| CN201810788537.7A Pending CN108923659A (en) | 2018-07-18 | 2018-07-18 | DC-DC converter and its control method and control circuit, storage medium |
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| CN (1) | CN108923659A (en) |
| WO (1) | WO2020015292A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020015292A1 (en) * | 2018-07-18 | 2020-01-23 | 珠海格力电器股份有限公司 | Direct current-direct current converter, control method and control circuit therefor, and storage medium |
| CN111404236A (en) * | 2020-04-24 | 2020-07-10 | 深圳硕日新能源科技有限公司 | Charging circuit of photovoltaic charging controller and photovoltaic charging controller |
| TWI826234B (en) * | 2022-08-31 | 2023-12-11 | 立錡科技股份有限公司 | Resonant switched capacitor voltage converter and control method thereof |
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|---|---|---|---|---|
| US5262930A (en) * | 1992-06-12 | 1993-11-16 | The Center For Innovative Technology | Zero-voltage transition PWM converters |
| CN208401741U (en) * | 2018-07-18 | 2019-01-18 | 珠海格力电器股份有限公司 | DC-DC converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101412821B1 (en) * | 2012-10-31 | 2014-06-27 | 삼성전기주식회사 | Power factor correction circuit and power supply having the same |
| CN103475232B (en) * | 2013-09-30 | 2017-02-15 | 绿色储能技术研究院有限公司 | High-precision bidirectional converter for electric energy storage and circulation |
| CN108923659A (en) * | 2018-07-18 | 2018-11-30 | 珠海格力电器股份有限公司 | DC-DC converter and its control method and control circuit, storage medium |
-
2018
- 2018-07-18 CN CN201810788537.7A patent/CN108923659A/en active Pending
- 2018-12-13 WO PCT/CN2018/120961 patent/WO2020015292A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5262930A (en) * | 1992-06-12 | 1993-11-16 | The Center For Innovative Technology | Zero-voltage transition PWM converters |
| CN208401741U (en) * | 2018-07-18 | 2019-01-18 | 珠海格力电器股份有限公司 | DC-DC converter |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020015292A1 (en) * | 2018-07-18 | 2020-01-23 | 珠海格力电器股份有限公司 | Direct current-direct current converter, control method and control circuit therefor, and storage medium |
| CN111404236A (en) * | 2020-04-24 | 2020-07-10 | 深圳硕日新能源科技有限公司 | Charging circuit of photovoltaic charging controller and photovoltaic charging controller |
| CN111404236B (en) * | 2020-04-24 | 2022-05-13 | 深圳硕日新能源科技有限公司 | Charging circuit of photovoltaic charging controller and photovoltaic charging controller |
| TWI826234B (en) * | 2022-08-31 | 2023-12-11 | 立錡科技股份有限公司 | Resonant switched capacitor voltage converter and control method thereof |
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| WO2020015292A1 (en) | 2020-01-23 |
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