CN110022066A - CLLC circuit of synchronous rectification and control method - Google Patents
CLLC circuit of synchronous rectification and control method Download PDFInfo
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- CN110022066A CN110022066A CN201810015899.2A CN201810015899A CN110022066A CN 110022066 A CN110022066 A CN 110022066A CN 201810015899 A CN201810015899 A CN 201810015899A CN 110022066 A CN110022066 A CN 110022066A
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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
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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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- Power Engineering (AREA)
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Abstract
The present invention provides a kind of CLLC circuit of synchronous rectification and control methods, wherein, the circuit includes: primary side full-bridge biphase rectification circuit, by primary side resonant capacitance, primary side resonant inductance, the secondary resonance circuit that resonant capacitance is constituted in resonant inductance and pair, transformer between primary side resonant inductance and secondary side resonant inductance, secondary side full-bridge biphase rectification circuit are set；Wherein, further includes: secondary current sensor is arranged between secondary side full-bridge biphase rectification circuit and transformer, for detecting the current phase of transformer secondary；Secondary controller, it is connect with the secondary side full-bridge biphase rectification circuit and secondary current sensor, for according to it is secondary while full-bridge biphase rectification circuit bridge arm mid-point voltage phase and secondary current sensor detect it is secondary while current phase between relationship, control turning on and off for synchronous rectifier in the full-bridge biphase rectification circuit of secondary side.Above-mentioned technical proposal realizes turning on and off for accurate control synchronous rectifier.
Description
Technical field
The present invention relates to bidirectional DC/DC technical field, in particular to a kind of CLLC circuit of synchronous rectification and control method.
Background technique
Traditional synchronous rectification scheme, by increasing voltage sensor, detection switch at the switching tube both ends of rectification circuit
Pipe both end voltage carrys out the voltage or C and D of C point and bus+ in the state that turns on and off of control switch pipe, such as detection Fig. 1
Between voltage etc., realize the synchronous rectification control of system.
The scheme that tradition synchronizes rectification control by detecting voltage is not suitable for CLLC synchronous rectification control, inaccurately.
Summary of the invention
The embodiment of the invention provides a kind of CLLC circuit of synchronous rectification, accurately control CLLC synchronous rectification to realize
Synchronous rectifier turns on and off in circuit, which includes: primary side full-bridge biphase rectification circuit, by primary side resonant capacitance,
Primary side resonant inductance, the secondary resonance circuit that resonant capacitance is constituted in resonant inductance and pair, are arranged in primary side resonant inductance and pair
Transformer between the resonant inductance of side, secondary side full-bridge biphase rectification circuit；Wherein, further includes:
Secondary current sensor is arranged between secondary side full-bridge biphase rectification circuit and transformer, for detecting transformer
The current phase on secondary side；
Secondary controller is connect, for according to pair with the secondary side full-bridge biphase rectification circuit and secondary current sensor
While full-bridge biphase rectification circuit bridge arm mid-point voltage phase and secondary current sensor detect it is secondary while current phase between
Relationship controls turning on and off for synchronous rectifier in secondary side full-bridge biphase rectification circuit.
The embodiment of the invention also provides a kind of control methods of CLLC circuit of synchronous rectification, accurately control to realize
Synchronous rectifier turns on and off, which includes:
Obtain the current phase on the secondary side of secondary current sensor detection；
According to it is secondary while full-bridge biphase rectification circuit bridge arm mid-point voltage phase and secondary current sensor detection it is secondary while
Relationship between current phase controls turning on and off for synchronous rectifier in secondary side full-bridge biphase rectification circuit.
The embodiment of the invention also provides a kind of computer equipments, including memory, processor and storage are on a memory
And the computer program that can be run on a processor, processor realize above-mentioned CLLC circuit of synchronous rectification when executing computer program
Control method.
The embodiment of the invention also provides a kind of computer readable storage medium, computer-readable recording medium storage is held
The computer program of the control method of the above-mentioned CLLC circuit of synchronous rectification of row.
Compared in the prior art by detection voltage realization synchronous rectification scheme, technology provided in an embodiment of the present invention
Scheme by detecting the current phase on secondary side, and according to it is secondary in full-bridge biphase rectification circuit bridge arm mid-point voltage phase and it is secondary while electricity
Relationship between the current phase on the secondary side of flow sensor detection controls synchronous rectifier in the full-bridge biphase rectification circuit of secondary side
It turns on and off, realizes that the scheme of synchronous rectification control is suitable for CLLC circuit of synchronous rectification by detection electric current, than traditional
It is more direct to detect voltage system, realizes in the case that voltage and current phase is inconsistent in CLLC circuit, passes through detection electric current
It realizes synchronous rectification control, realizes turning on and off for accurate control synchronous rectifier.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, not
Constitute limitation of the invention.In the accompanying drawings:
Fig. 1 is the structural schematic diagram of CLLC circuit of synchronous rectification in the embodiment of the present invention；
Fig. 2 is the flow diagram of the control method of CLLC circuit of synchronous rectification in the embodiment of the present invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, right below with reference to embodiment and attached drawing
The present invention is described in further details.Here, exemplary embodiment and its explanation of the invention is used to explain the present invention, but simultaneously
It is not as a limitation of the invention.
With the development of power electronic technique and battery technology, on the market energy storage require using more and more, such as family
Front yard photovoltaic energy storage system, new-energy automobile energy-storage system etc..The bidirectional DC/DC circuit component part important as energy-storage system, it is double
Research to DCDC circuit by more and more people.Traditional transposition full-bridge circuit and double had based on what transposition full-bridge developed
Source bridge circuit (DAB) circuit can be realized bidirectional DC/DC transformation, but efficiency is very low under light duty, is frequently not most ideal
Topology selection.In recent years since LLC circuit is able to achieve Sofe Switch in full-load range, high efficiency is realized in full-load range
Operation, LLC circuit are widely used in unidirectional DCDC.
Bidirectional DC/DC transformation is realized based on the CLLC circuit that LLC is developed, CLLC circuit is as shown in Figure 1.The circuit
It is made of primary side full-bridge circuit (primary side full-bridge biphase rectification circuit) and pair in full-bridge circuit (full-bridge biphase rectification circuit while secondary),
Primary and secondary side is made of active device, each series capacitance of primary and secondary side and inductance, forms resonance circuit, and former pair side passes through
Transformer realizes electrical isolation.Fig. 1 is basic CLLC circuit, and CLLC circuit is by resonant inductance L1, L2, transformer T, former negative side
Resonant capacitance composition.It is in series or in parallel by primary side or secondary side full-bridge circuit on basic CLLC circuit base, it can
Realize power ascension or broad voltage regulation range, while can also be with optimization system operating point, lifting system efficiency.CLLC circuit
LLC is inherited the advantages of full-load range can be realized Sofe Switch, while being able to achieve bidirectional DC/DC transformation, CLLC circuit is one
The good bidirectional DC/DC circuit of kind.
CLLC circuit will realize DCDC circuit energy two-way flow, need the original secondary Bian Douyong active device generation in transformer
For passive device.When energy is flowed from the primary side of transformer T to secondary side, the switching tube of transformer primary side works in circuit activation
Source state, secondary-side switch pipe work in synchronous rectification state.When energy is flowed from the secondary side of transformer T to primary side, transformer
The work of secondary-side switch pipe in driving source state, transformer primary side switching tube works in synchronous rectification state.
Inventor's discovery: conventional synchronization rectify control program opened controlling pipe by detecting the voltage at pipe both ends or
Person's shutdown, can be good at the case where realizing synchronous rectification, being directly connected to synchronous rectification bridge especially for transformer secondary.Together
Step rectifier bridge and subsequent DC load are equivalent to resistive load, and transformer secondary is directly connected to resistive load, transformer secondary
Voltage and current same-phase, therefore, detection switch pipe both end voltage signal are known that transformer secondary side current signal, for passing
It is feasible that the transformer secondary of system, which directly connects synchronous rectification bridge circuit,.
But for CLLC circuit, capacitor and inductance are also connected between transformer secondary and synchronous rectification bridge, and
The work of CLLC circuit is in frequency conversion state, therefore the current phase of the voltage at switching tube both ends and switching tube may inconsistent, electric current
Possible leading voltage, it is also possible to lag behind voltage.Therefore, traditional voltage detection scheme is not suitable for CLLC synchronous rectification control
System.
Since inventor has found technical problem of the existing technology, propose a kind of by detection CLLC secondary current
Scheme realize new departure of synchronous rectification to control secondary side synchronous rectification switch.Simultaneously, moreover it is possible to by current signal, to control
The switch of secondary synchronous rectifier processed rationally controls secondary side power factor (PF), lifting system efficiency.The program specifically includes that
1) increase current sensor between transformer and circuit of synchronous rectification, example transimission power from left to right as shown in figure 1
When, the current sensor positioned at position shown in Fig. 11 detects current phase.When turning left transimission power from the right side, it is located at 2 institutes in Fig. 1
Show the current sensor detection current phase of position.
2) transformer secondary side current phase is detected by L2 and C2 current sensor in Fig. 1, by the switch of secondary-side switch pipe
Frequency control is consistent with primary side, controls secondary side bridge arm mid-point voltage phase by control secondary-side switch pipe, allows synchronous rectifier
Equivalent circuit with load is perception, capacitive or resistive.
3) when secondary side bridge arm mid-point voltage phase is ahead of electric current, (voltage-phase is to be switched to manage by T5/T6/T7/T8
System, specifically control can be realized by software, can be controlled by secondary controller), equivalent circuit is perception；When
When secondary side bridge arm mid-point voltage phase and current phase are with phase, equivalent circuit is resistive；When secondary side bridge arm mid-point voltage lags behind
Current phase, equivalent circuit are capacitive.
The CLLC circuit of synchronous rectification and control method are described in detail as follows below.
Fig. 1 is the structural schematic diagram of CLLC circuit of synchronous rectification in the embodiment of the present invention, as shown in Figure 1, the circuit includes:
Primary side full-bridge biphase rectification circuit 10, it is humorous in resonant inductance L2 and pair by primary side resonant capacitance C1, primary side resonant inductance L1, pair
The resonance circuit that the capacitor C2 that shakes is constituted, is arranged in the transformer T between primary side resonant inductance L1 and pair side resonant inductance L2, secondary side
Full-bridge biphase rectification circuit 20；Wherein, further includes:
Secondary current sensor 1 is arranged between secondary side full-bridge biphase rectification circuit 20 and transformer T, becomes for detecting
The current phase on depressor T pair side；
Secondary controller connect with the secondary side full-bridge biphase rectification circuit 20 and secondary current sensor 1, is used for basis
It is secondary while 20 bridge arm mid-point voltage phase of full-bridge biphase rectification circuit and secondary current sensor 1 detect it is secondary while current phase it
Between relationship, control turning on and off for synchronous rectifier in secondary side full-bridge biphase rectification circuit 20.
Compared in the prior art by detection voltage realization synchronous rectification scheme, technology provided in an embodiment of the present invention
Scheme by detecting the current phase on secondary side, and according to it is secondary in full-bridge biphase rectification circuit bridge arm mid-point voltage phase and it is secondary while electricity
Relationship between the current phase on the secondary side of flow sensor detection controls synchronous rectifier in the full-bridge biphase rectification circuit of secondary side
It turns on and off, realizes that the scheme of synchronous rectification control is suitable for CLLC circuit of synchronous rectification by detection electric current, than traditional
It is more direct to detect voltage system, realizes in the case that voltage and current phase is inconsistent in CLLC circuit, passes through detection electric current
It realizes synchronous rectification control, realizes turning on and off for accurate control synchronous rectifier.
It is existing detect voltage synchronize rectification control by way of, can only control efficient circuit be resistive, Bu Nengling
Sofe Switch is realized livingly；And the application can control electric current by way of detecting electric current as resistive, capacitive or perception, realize
Flexibly control Sofe Switch, while the flexibility turned on and off with improving switching tube.The embodiment of the present invention is provided below same
The control flexibility of step rectification scheme is introduced as follows.
In one embodiment, the secondary controller specifically can be used for:
In the secondary current phase when 20 bridge arm mid-point voltage phase of full-bridge biphase rectification circuit is ahead of secondary, control is secondary
Synchronous rectifier and the equivalent circuit even loaded are perception in side full-bridge biphase rectification circuit 20；Or it is two-way whole in secondary side full-bridge
When 20 bridge arm mid-point voltage phase of current circuit is identical as the secondary current phase on side, it is resistive for controlling the equivalent circuit；Or in pair
When current phase when 20 bridge arm mid-point voltage phase of full-bridge biphase rectification circuit lags behind secondary, controlling the equivalent circuit is
Capacitive；
It is perceptual, resistive or capacitive according to equivalent circuit, controls synchronous rectifier in secondary side full-bridge biphase rectification circuit 20
Turn on and off.
When it is implemented, when CLLC circuit works, by detecting secondary current phase, to control the open-minded of synchronous rectifier
And shutdown, it is more direct than traditional detection voltage system, solve the situation that voltage and current phase is inconsistent in CLLC circuit.
Meanwhile by directly detecting electric current, the switch time of secondary-side switch pipe is reasonably controlled, adjusts the phase at secondary side bridge arm midpoint,
Equivalent circuit is controlled as perception, capacitive or resistive, while can control transformer secondary equivalent circuit also as perception, capacitive
Or it is resistive, and then lifting system efficiency.
When it is implemented, external dc electricity inversion can be alternating current, warp by the primary side full-bridge biphase rectification circuit 10
Alternating current after crossing the decompression of transformer T is rectified into direct current by secondary side full-bridge biphase rectification circuit 20, and output is to external negative
It carries；Or the DC inverter of external loading can be alternating current by secondary side full-bridge biphase rectification circuit 20, by the liter of transformer T
Alternating current after pressure is rectified into direct current electricity output by primary side full-bridge biphase rectification circuit 10.
When it is implemented, as shown in Figure 1, secondary side full-bridge biphase rectification circuit 20 may include:
Third switching tube bridge arm, third switching tube bridge arm may include: the 5th switching transistor T5, the 5th rectifier diode
D5, the 6th switching transistor T6, the 6th rectifier diode D6；The of the midpoint of third switching tube bridge arm and pair side resonant capacitance C2
One end connection；The secondary second end in resonant capacitance C2 is connect with the first end of resonant inductance L2 when pair；Secondary side resonant inductance L2's
Second end is connect with transformer T vice-side winding first end；
4th switching tube bridge arm, the 4th switching tube bridge arm may include: the 7th switching transistor T7, the 7th rectifier diode
D7, the 8th switching transistor T8, the 8th rectifier diode D8；The midpoint of 4th switching tube bridge arm and secondary current sensor 1
First end connection；The second end of secondary current sensor 1 is connect with transformer T vice-side winding second end；
Wherein, cathode, the 7th switching transistor T7 of the source electrode of the 5th switching transistor T5 and the 5th rectifier diode D5
Source electrode connection；The drain electrode of 5th switching transistor T5 and the anode of the 5th rectifier diode D5, the 6th switching transistor T6
The first end connection of source electrode, pair side resonant capacitance C2；
The first end of the cathode of the source electrode of 6th switching transistor T6 and the 6th rectifier diode D6, pair side resonant capacitance C2
Connection；The drain electrode of the anode, the 8th switching transistor T8 of the drain electrode and the 6th rectifier diode D6 of 6th switching transistor T6 connects
It connects；
The source electrode of 7th switching transistor T7 is connect with the cathode of the 7th rectifier diode D7；7th switching transistor T7's
Drain electrode is connect with the source electrode of the anode of the 7th rectifier diode D7, the 8th switching transistor T8；
The source electrode of 8th switching transistor T8 is connect with the cathode of the 8th rectifier diode D8；8th switching transistor T8's
Drain electrode is connect with the anode of the 8th rectifier diode D8；
The source electrode of 5th switching transistor T5 and the source electrode of the 7th switching transistor T7 connect the first of secondary side electric capacity of voltage regulation C4
End and load first end；The drain electrode of 6th switching transistor T6 and the drain electrode of the 8th switching transistor T8 meet secondary side electric capacity of voltage regulation C4
Second end and load second end；
5th switching transistor T5, the 6th switching transistor T6, the 7th switching transistor T7 and the 8th switching transistor T8
Grid connect with secondary controller, secondary controller passes through the 5th switching transistor T5 of control, the 6th switching transistor T6, the
The voltage-phase of seven switching transistor T7 and the 8th switching transistor T8, to control secondary side bridge arm mid-point voltage phase.Secondary side control
Device processed is not shown in FIG. 1.
In one embodiment, CLLC circuit of synchronous rectification can also include:
Primary current sensor 2 is arranged between primary side full-bridge biphase rectification circuit 10 and transformer T, becomes for detecting
The current phase of depressor T primary side；
Primary controller is connect with the primary side full-bridge biphase rectification circuit 10 and primary current sensor 2, is used for basis
The current phase for the primary side that 10 bridge arm mid-point voltage phase of primary side full-bridge biphase rectification circuit and primary current sensor 2 detect it
Between relationship, control synchronous rectifier in primary side full-bridge biphase rectification circuit 10 and turn on and off.
In one embodiment, the primary-side-control implement body can be used for:
When 10 bridge arm mid-point voltage phase of primary side full-bridge biphase rectification circuit is ahead of the current phase of primary side, control is former
Synchronous rectifier and the equivalent circuit even loaded are perception in side full-bridge biphase rectification circuit 10；Or it is two-way whole in primary side full-bridge
When 10 bridge arm mid-point voltage phase of current circuit is identical as the current phase of primary side, it is resistive for controlling the equivalent circuit；Or in original
When full-bridge biphase rectification circuit 10 bridge arm mid-point voltage phase in side lags behind the current phase of primary side, controlling the equivalent circuit is
Capacitive；
It is perceptual, resistive or capacitive according to equivalent circuit, controls synchronous rectifier in primary side full-bridge biphase rectification circuit 10
Turn on and off.
When it is implemented, primary side full-bridge biphase rectification circuit 10 may include:
First switch tube bridge arm, first switch tube bridge arm may include: first switch triode T1, the first rectifier diode
D1, second switch triode T2, the second rectifier diode D2；The of the midpoint of first switch tube bridge arm and primary side resonant capacitance C1
One end connection；The second end of primary side resonant capacitance C1 is connect with the first end of primary side resonant inductance L1；Primary side resonant inductance L1's
Second end is connect with transformer T primary side winding first end；
Second switch bridge arm, second switch bridge arm may include: third switching transistor T3, third rectifier diode
D3, the 4th switching transistor T4, the 4th rectifier diode D4；The midpoint of second switch bridge arm and primary current sensor 2
First end connection；The second end of primary current sensor 2 is connect with transformer T primary side winding second end；
Wherein, the cathode of the source electrode of first switch triode T1 and the first rectifier diode D1, third switching transistor T3
Source electrode connection；The drain electrode of first switch triode T1 and the anode of the first rectifier diode D1, second switch triode T2
Source electrode connection；
The source electrode of second switch triode T2 is connect with the cathode of the second rectifier diode D2；Second switch triode T2's
Drain electrode is connect with the drain electrode of the anode, the 4th switching transistor T4 of the second rectifier diode D2；
The source electrode of third switching transistor T3 is connect with the cathode of third rectifier diode D3；Third switching transistor T3's
Drain electrode is connect with the source electrode of the anode of third rectifier diode D3, the 4th switching transistor T4；
The source electrode of 4th switching transistor T4 is connect with the cathode of the 4th rectifier diode D4；4th switching transistor T4's
Drain electrode is connect with the anode of the 4th rectifier diode D4；
The source electrode of first switch triode T1 and the source electrode of third switching transistor T3 connect the first of primary side electric capacity of voltage regulation C3
End；The drain electrode of second switch triode T2 and the drain electrode of the 4th switching transistor T4 connect the second end of primary side electric capacity of voltage regulation C3；
The grid of first switch triode T1, the grid of second switch triode T2, third switching transistor T3 grid
Connect with the grid of the 4th switching transistor T4 with primary controller, primary controller by control first switch triode T1,
The voltage-phase of second switch triode T2, third switching transistor T3 and the 4th switching transistor T4, to control primary side bridge arm
Mid-point voltage phase.Primary controller is not shown in FIG. 1.
Based on the same inventive concept, a kind of controlling party of CLLC circuit of synchronous rectification is additionally provided in the embodiment of the present invention
Method, such as the following examples.The principle and CLLC synchronous rectification solved the problems, such as due to the control method of CLLC circuit of synchronous rectification
Circuit is similar, therefore the implementation of the control method of CLLC circuit of synchronous rectification may refer to the controlling party of CLLC circuit of synchronous rectification
The implementation of method, overlaps will not be repeated.Used below, predetermined function may be implemented in term " unit " or " module "
The combination of software and/or hardware.Although device described in following embodiment is preferably realized with software, hardware, or
The realization of the combination of person's software and hardware is also that may and be contemplated.
Fig. 2 is the flow diagram of the control method of CLLC circuit of synchronous rectification in the embodiment of the present invention, as shown in Fig. 2,
The control method includes the following steps:
Step 101: obtaining the current phase on the secondary side that secondary current sensor 1 detects；
Step 102: being examined according to secondary 20 bridge arm mid-point voltage phase of side full-bridge biphase rectification circuit and secondary current sensor 1
Relationship between the current phase on the secondary side of survey controls opening and closing for synchronous rectifier in secondary side full-bridge biphase rectification circuit 20
It is disconnected.
In an example, it is sensed according to secondary 20 bridge arm mid-point voltage phase of side full-bridge biphase rectification circuit and secondary current
Relationship between the current phase on the secondary side that device 1 detects controls opening for synchronous rectifier in secondary side full-bridge biphase rectification circuit 20
Lead to and turn off, may include:
In the secondary current phase when 20 bridge arm mid-point voltage phase of full-bridge biphase rectification circuit is ahead of secondary, control is secondary
Synchronous rectifier and the equivalent circuit even loaded are perception in side full-bridge biphase rectification circuit 20；Or it is two-way whole in secondary side full-bridge
When 20 bridge arm mid-point voltage phase of current circuit is identical as the secondary current phase on side, it is resistive for controlling the equivalent circuit；Or in pair
When current phase when 20 bridge arm mid-point voltage phase of full-bridge biphase rectification circuit lags behind secondary, controlling the equivalent circuit is
Capacitive；
It is perceptual, resistive or capacitive according to equivalent circuit, controls synchronous rectifier in secondary side full-bridge biphase rectification circuit 20
Turn on and off.
It is provided in an embodiment of the present invention by way of detecting electric current, synchronize rectification control scheme be not only applicable in
Basic CLLC circuit, is equally applicable on basic CLLC circuit base shown in Fig. 1, passes through primary side or secondary side
Full-bridge circuit is in series or in parallel, can be realized the circuit or broad voltage regulation range of power ascension, while can also optimize and be
System operating point, the circuit of lifting system efficiency.Such as: if you need to promote output power, rectification that can be the same in secondary side two-way
Circuit, parallel operation；It, can be in secondary side two-way if you need to promote output voltage in the case where not promoting secondary side pipe voltage
The same rectification circuit, tandem working.
In an example, the control method of above-mentioned CLLC circuit of synchronous rectification can also include:
Obtain the current phase for the primary side that primary current sensor 2 detects；
The primary side detected according to 10 bridge arm mid-point voltage phase of primary side full-bridge biphase rectification circuit and primary current sensor 2
Current phase between relationship, control synchronous rectifier in primary side full-bridge biphase rectification circuit 10 and turn on and off.
In an example, it is sensed according to 10 bridge arm mid-point voltage phase of primary side full-bridge biphase rectification circuit and primary current
Relationship between the current phase for the primary side that device 2 detects controls synchronous rectifier in primary side full-bridge biphase rectification circuit 10 and opens
Lead to and turn off, may include:
When 10 bridge arm mid-point voltage phase of primary side full-bridge biphase rectification circuit is ahead of the current phase of primary side, control is former
Synchronous rectifier and the equivalent circuit even loaded are perception in side full-bridge biphase rectification circuit 10；Or it is two-way whole in primary side full-bridge
When 10 bridge arm mid-point voltage phase of current circuit is identical as the current phase of primary side, it is resistive for controlling the equivalent circuit；Or in original
When full-bridge biphase rectification circuit 10 bridge arm mid-point voltage phase in side lags behind the current phase of primary side, controlling the equivalent circuit is
Capacitive；
It is perceptual, resistive or capacitive according to equivalent circuit, controls synchronous rectifier in primary side full-bridge biphase rectification circuit 10
Turn on and off.
The embodiment of the invention also provides a kind of computer equipments, including memory, processor and storage are on a memory
And the computer program that can be run on a processor, processor realize above-mentioned CLLC circuit of synchronous rectification when executing computer program
Control method.
The embodiment of the invention also provides a kind of computer readable storage medium, computer-readable recording medium storage is held
The computer program of the control method of the above-mentioned CLLC circuit of synchronous rectification of row.
The present invention implements the advantageous effects of the technical solution provided are as follows: by detecting CLLC secondary current, to control
The scheme of secondary side synchronous rectification switch, while realizing synchronous rectification, moreover it is possible to by current signal, to control secondary side synchronous rectification
The switch of pipe rationally controls secondary side power factor (PF), lifting system efficiency；
In addition, realizing synchronous rectification by detection CLLC primary current to control the scheme of primary side synchronous rectification switch
Simultaneously, moreover it is possible to by current signal, to control the switch of primary side synchronous rectifier, rationally control primary side power factor (PF), promote system
System efficiency.
Obviously, those skilled in the art should be understood that each module of the above-mentioned embodiment of the present invention or each step can be with
It is realized with general computing device, they can be concentrated on a single computing device, or be distributed in multiple computing devices
On composed network, optionally, they can be realized with the program code that computing device can perform, it is thus possible to by it
Store and be performed by computing device in the storage device, and in some cases, can be held with the sequence for being different from herein
The shown or described step of row, perhaps they are fabricated to each integrated circuit modules or will be multiple in them
Module or step are fabricated to single integrated circuit module to realize.In this way, the embodiment of the present invention be not limited to it is any specific hard
Part and software combine.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the embodiment of the present invention can have various modifications and variations.All within the spirits and principles of the present invention, made
Any modification, equivalent substitution, improvement and etc. should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of CLLC circuit of synchronous rectification, comprising: primary side full-bridge biphase rectification circuit (10), by primary side resonant capacitance (C1),
Primary side resonant inductance (L1), the secondary resonance circuit that resonant capacitance (C2) is constituted in resonant inductance (L2) and pair, are arranged in primary side
Transformer (T) between resonant inductance (L1) and secondary side resonant inductance (L2), secondary side full-bridge biphase rectification circuit (20)；Its feature
It is, further includes:
Secondary current sensor (1) is arranged between secondary side full-bridge biphase rectification circuit (20) and transformer (T), for detecting
The current phase on transformer (T) pair side；
Secondary controller connect with the secondary side full-bridge biphase rectification circuit (20) and secondary current sensor (1), is used for basis
It is secondary while full-bridge biphase rectification circuit (20) bridge arm mid-point voltage phase and secondary current sensor (1) detect it is secondary while electric current phase
Relationship between position controls turning on and off for synchronous rectifier in secondary side full-bridge biphase rectification circuit (20).
2. CLLC circuit of synchronous rectification as described in claim 1, which is characterized in that the secondary controller is specifically used for:
In the secondary current phase when full-bridge biphase rectification circuit (20) bridge arm mid-point voltage phase is ahead of secondary, secondary side is controlled
Synchronous rectifier and the equivalent circuit even loaded are perception in full-bridge biphase rectification circuit (20)；Or it is two-way whole in secondary side full-bridge
When current circuit (20) bridge arm mid-point voltage phase is identical as the secondary current phase on side, it is resistive for controlling the equivalent circuit；Or
When the secondary current phase when full-bridge biphase rectification circuit (20) bridge arm mid-point voltage phase lags behind secondary, the equivalent electricity is controlled
Road is capacitive；
It is perceptual, resistive or capacitive according to equivalent circuit, controls synchronous rectifier in secondary side full-bridge biphase rectification circuit (20)
It turns on and off.
3. CLLC circuit of synchronous rectification as described in claim 1, which is characterized in that further include:
Primary current sensor (2) is arranged between primary side full-bridge biphase rectification circuit (10) and transformer (T), for detecting
The current phase of transformer (T) primary side；
Primary controller is connect with the primary side full-bridge biphase rectification circuit (10) and primary current sensor (2), is used for basis
The electric current phase for the primary side that primary side full-bridge biphase rectification circuit (10) bridge arm mid-point voltage phase is detected with primary current sensor (2)
Relationship between position, synchronous rectifier turns on and off in control primary side full-bridge biphase rectification circuit (10).
4. CLLC circuit of synchronous rectification as claimed in claim 3, which is characterized in that the primary controller is specifically used for:
When primary side full-bridge biphase rectification circuit (10) bridge arm mid-point voltage phase is ahead of the current phase of primary side, primary side is controlled
Synchronous rectifier and the equivalent circuit even loaded are perception in full-bridge biphase rectification circuit (10)；Or it is two-way whole in primary side full-bridge
When current circuit (10) bridge arm mid-point voltage phase is identical as the current phase of primary side, it is resistive for controlling the equivalent circuit；Or
When primary side full-bridge biphase rectification circuit (10) bridge arm mid-point voltage phase lags behind the current phase of primary side, the equivalent electricity is controlled
Road is capacitive；
It is perceptual, resistive or capacitive according to equivalent circuit, synchronous rectifier in control primary side full-bridge biphase rectification circuit (10)
It turns on and off.
5. a kind of control method of CLLC circuit of synchronous rectification characterized by comprising
Obtain the current phase on the secondary side of secondary current sensor (1) detection；
According to it is secondary while full-bridge biphase rectification circuit (20) bridge arm mid-point voltage phase and secondary current sensor (1) detection it is secondary while
Current phase between relationship, control turning on and off for synchronous rectifier in secondary side full-bridge biphase rectification circuit (20).
6. the control method of CLLC circuit of synchronous rectification as claimed in claim 5, which is characterized in that two-way according to secondary side full-bridge
Pass between the current phase on the secondary side of rectification circuit (20) bridge arm mid-point voltage phase and secondary current sensor (1) detection
It is that synchronous rectifier turns on and off in the secondary side full-bridge biphase rectification circuit (20) of control, comprising:
In the secondary current phase when full-bridge biphase rectification circuit (20) bridge arm mid-point voltage phase is ahead of secondary, secondary side is controlled
Synchronous rectifier and the equivalent circuit even loaded are perception in full-bridge biphase rectification circuit (20)；Or it is two-way whole in secondary side full-bridge
When current circuit (20) bridge arm mid-point voltage phase is identical as the secondary current phase on side, it is resistive for controlling the equivalent circuit；Or
When the secondary current phase when full-bridge biphase rectification circuit (20) bridge arm mid-point voltage phase lags behind secondary, the equivalent electricity is controlled
Road is capacitive；
It is perceptual, resistive or capacitive according to equivalent circuit, controls synchronous rectifier in secondary side full-bridge biphase rectification circuit (20)
It turns on and off.
7. the control method of CLLC circuit of synchronous rectification as claimed in claim 5, which is characterized in that further include:
Obtain the current phase of the primary side of primary current sensor (2) detection；
According to the primary side of primary side full-bridge biphase rectification circuit (10) bridge arm mid-point voltage phase and primary current sensor (2) detection
Current phase between relationship, synchronous rectifier turns on and off in control primary side full-bridge biphase rectification circuit (10).
8. the control method of CLLC circuit of synchronous rectification as claimed in claim 7, which is characterized in that two-way according to primary side full-bridge
Pass between rectification circuit (10) bridge arm mid-point voltage phase and the current phase of the primary side of primary current sensor (2) detection
It is that synchronous rectifier turns on and off in control primary side full-bridge biphase rectification circuit (10), comprising:
When primary side full-bridge biphase rectification circuit (10) bridge arm mid-point voltage phase is ahead of the current phase of primary side, primary side is controlled
Synchronous rectifier and the equivalent circuit even loaded are perception in full-bridge biphase rectification circuit (10)；Or it is two-way whole in primary side full-bridge
When current circuit (10) bridge arm mid-point voltage phase is identical as the current phase of primary side, it is resistive for controlling the equivalent circuit；Or
When primary side full-bridge biphase rectification circuit (10) bridge arm mid-point voltage phase lags behind the current phase of primary side, the equivalent electricity is controlled
Road is capacitive；
It is perceptual, resistive or capacitive according to equivalent circuit, synchronous rectifier in control primary side full-bridge biphase rectification circuit (10)
It turns on and off.
9. a kind of computer equipment including memory, processor and stores the meter that can be run on a memory and on a processor
Calculation machine program, which is characterized in that the processor realizes any side of claim 5 to 8 when executing the computer program
Method.
10. a kind of computer readable storage medium, which is characterized in that the computer-readable recording medium storage has perform claim
It is required that the computer program of 5 to 8 any the methods.
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| CN201810015899.2A CN110022066A (en) | 2018-01-08 | 2018-01-08 | CLLC circuit of synchronous rectification and control method |
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| CN201810015899.2A CN110022066A (en) | 2018-01-08 | 2018-01-08 | CLLC circuit of synchronous rectification and control method |
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