CN112701918A - Control circuit for wide-range output of LLC converter - Google Patents
Control circuit for wide-range output of LLC converter Download PDFInfo
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- CN112701918A CN112701918A CN202011500428.4A CN202011500428A CN112701918A CN 112701918 A CN112701918 A CN 112701918A CN 202011500428 A CN202011500428 A CN 202011500428A CN 112701918 A CN112701918 A CN 112701918A
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
- B60L53/22—Constructional details or arrangements of charging converters specially adapted for charging electric vehicles
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
Abstract
The invention discloses a control circuit of wide-range output of an LLC converter, which belongs to the technical field of power supply, and comprises a switch bridge unit, a resonance unit and a rectification filter unit, wherein the switch bridge unit comprises a switch bridge consisting of 4 MSO (multi-domain synchronous oxide) tubes, the rectification filter unit comprises a rectifier bridge, a first switch S1 for controlling the rectifier bridge to work in a full-wave rectification mode, a second switch S2 for controlling the rectifier bridge to work in a full-bridge rectification mode, a filter capacitor C and a resistor R, so that the technical problem of narrow output voltage range of the LLC converter is solved, the control circuit can lead the output voltage to work in high-voltage and low-voltage working modes by controlling the on-off of a first switch S1 and a second switch S2, can be suitable for electric automobiles with different battery configurations, and can meet the requirement of outputting wide-range output voltage indexes of 200V-900V, and control signals of the first switch S1 and the second switch S2 adopt an interlocking control mode, the first switch S1 and the second switch S2 are alternately operated, seamless switching can be realized, and control is easy.
Description
Technical Field
The invention belongs to the technical field of power supplies, and relates to a control circuit for wide-range output of an LLC converter.
Background
In recent years, with the rapid development of switching power supply technology, power transformers are widely used in various industries such as household appliances, photovoltaics, charging piles, server power supplies and the like, and a common scheme is that the voltage of an alternating current power grid is converted into the voltage required by a user through an alternating current-direct current converter (an AC/DC circuit) and then through a direct current-direct current converter (a DC/DC circuit). In order to realize electrical isolation between a user side and an alternating current network side by considering safety factors, a DC/DC circuit with high-frequency transformer isolation is usually adopted in the DC/DC circuit, and the isolated DC/DC circuits according to different application scenarios include a flyback converter, a forward converter, a hard-switched half-bridge converter, a hard-switched full-bridge converter, a phase-shifted full-bridge converter, an LLC converter, a dual-active-bridge converter, and the like.
With the enhancement of environmental awareness of people and the guidance of government policies, new energy electric vehicles are widely developed. The charger is an important basic support of the electric automobile and is a key condition for realizing the industrialization, popularization and popularization of the electric automobile. Along with the development of electric vehicles and batteries, the demand for charging voltage is also changing, and the direct current charging voltage of the electric vehicles is in the range of DC 200V-900V. In order to adapt to electric vehicles with different battery configurations, the output of the charger needs to cover the whole voltage range.
The wide-range output of the charger is a great challenge to the design of a power module, the existing charger generally adopts a phase-shifted full bridge or LLC, and the rectification output part of the charger generally adopts structures such as full-wave rectification or full-bridge rectification, but the requirements of the full-range output of DC200V-900V are difficult to meet.
The scheme adopted by the wide-range output of the power supply module in the prior art is that a rectification output circuit is set to be two-way output, and then the output port realizes voltage output in different stages through series-parallel connection control of a relay. The series-parallel mode control inevitably causes the voltage-sharing or current-sharing problem of the branch circuits, needs additional circuits to realize the control, and increases the complexity and the instability of the circuits.
Disclosure of Invention
The invention aims to provide a control circuit for wide-range output of an LLC converter, which solves the technical problem of narrow output voltage range of the LLC converter.
In order to achieve the purpose, the invention adopts the following technical scheme:
a control circuit for wide-range output of an LLC converter comprises a switch bridge unit, a resonance unit and a rectification filter unit, wherein the switch bridge unit comprises a switch bridge consisting of 4 MSO (minimum shift keying) tubes, and the switch bridge is connected with the rectification filter unit through the resonance unit;
the rectifying and filtering unit comprises a rectifying bridge, a first switch S1 for controlling the rectifying bridge to work in a full-wave rectification mode, a second switch S2 for controlling the rectifying bridge to work in a full-bridge rectification mode, a filter capacitor C and a resistor R.
Preferably, a control circuit for controlling the first switch S1 and the second switch S2 is further included.
Preferably, the resonant unit includes a resonant inductor Lr, a resonant capacitor Cr, and a transformer T with a center tap, the first output terminal of the switching bridge is connected to one end of the primary side of the transformer T with the center tap through the resonant inductor Lr, and the second output terminal of the switching bridge is connected to the other end of the primary side of the transformer T with the center tap through the resonant capacitor Cr.
Preferably, two ends of a secondary side of the transformer T with the middle tap are connected with the input end of a rectifier bridge, and the output end of the rectifier bridge respectively outputs Vo + power and Vo-power;
the center tap of the secondary side of the transformer T with the middle tap is connected with the Vo-power supply through a first switch S1;
the second switch S2 is connected in series with the output end of the rectifier bridge output Vo-power supply;
the capacitor C and the resistor R are connected in parallel between the Vo + power supply and the Vo-power supply.
Preferably, the switch bridge unit comprises a MOS transistor Q1, a MOS transistor Q2, a MOS transistor Q3 and a MOS transistor Q4, a D pole of the MOS transistor Q1 is connected with a D pole of the MOS transistor Q2, an S pole of the MOS transistor Q1 is connected with an S pole of the MOS transistor Q4, an S pole of the MOS transistor Q2 is connected with a D pole of the MOS transistor Q3, and an S pole of the MOS transistor Q4 is connected with an S pole of the MOS transistor Q3;
the D pole of the MOS tube Q1 is connected with the positive input end of the external power supply, and the S pole of the MOS tube Q is connected with the negative input end of the external power supply;
the S pole of the MOS tube Q1 is connected with one end of the primary side of the transformer T with the middle tap through the capacitor Cr;
the S pole of the MOS tube Q2 is connected with the other end of the primary side of the transformer T with the intermediate tap through the inductor Lr.
Preferably, the rectifier bridge comprises a diode D1, a diode D2, a diode D3 and a diode D4, wherein the anode of the diode D1 is connected with the 1 pin of the secondary side of the transformer T with the middle tap, and the cathode outputs the Vo + power supply;
the cathode of the diode D4 is connected to the 1 st pin of the secondary side of the transformer T with middle tap, and the anode outputs the Vo-power source through the second switch S2;
the anode of the diode D2 is connected with the 3 pin of the secondary side of the transformer T with the middle tap, and the cathode of the diode D1 is connected with the cathode of the transformer T with the middle tap;
the anode of the diode D3 is connected with the anode of the diode D4, and the cathode is connected with the 3-pin connection of the secondary side of the transformer T with the middle tap.
Preferably, the secondary side 2 pin of the transformer T with the center tap is the center tap of the transformer T with the center tap, and the secondary side 2 pin of the transformer T with the center tap is connected to the Vo-power source through the switch S1.
Preferably, the position of the center tap of the transformer T with the center tap is adjustable.
Preferably, the first switch S1 and the second switch S2 are interlock controlled.
The control circuit for wide-range output of the LLC converter solves the technical problem that the output voltage range of the LLC converter is narrow, enables the output voltage to work in a high-voltage working mode and a low-voltage working mode by controlling the on-off of the first switch S1 and the second switch S2, can be suitable for electric automobiles with different battery configurations, and meets the output voltage index of a wide range of 200V-900V, and the control signals of the first switch S1 and the second switch S2 adopt an interlocking control mode, so that the first switch S1 and the second switch S2 work alternately, seamless switching can be realized, and control is easy.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The control circuit for wide-range output of the LLC converter shown in fig. 1 includes a switch bridge unit, a resonance unit and a rectification filter unit, wherein the switch bridge unit includes a switch bridge composed of 4 MSO transistors, and the switch bridge is connected to the rectification filter unit through the resonance unit;
the rectifying and filtering unit comprises a rectifying bridge, a first switch S1 for controlling the rectifying bridge to work in a full-wave rectification mode, a second switch S2 for controlling the rectifying bridge to work in a full-bridge rectification mode, a filter capacitor C and a resistor R.
Preferably, a control circuit for controlling the first switch S1 and the second switch S2 is further included.
Preferably, the resonant unit includes a resonant inductor Lr, a resonant capacitor Cr, and a transformer T with a center tap, the first output terminal of the switching bridge is connected to one end of the primary side of the transformer T with the center tap through the resonant inductor Lr, and the second output terminal of the switching bridge is connected to the other end of the primary side of the transformer T with the center tap through the resonant capacitor Cr.
Preferably, two ends of a secondary side of the transformer T with the middle tap are connected with the input end of a rectifier bridge, and the output end of the rectifier bridge respectively outputs Vo + power and Vo-power;
the center tap of the secondary side of the transformer T with the middle tap is connected with the Vo-power supply through a first switch S1;
the second switch S2 is connected in series with the output end of the rectifier bridge output Vo-power supply;
the capacitor C and the resistor R are connected in parallel between the Vo + power supply and the Vo-power supply.
Preferably, the switch bridge unit comprises a MOS transistor Q1, a MOS transistor Q2, a MOS transistor Q3 and a MOS transistor Q4, a D pole of the MOS transistor Q1 is connected with a D pole of the MOS transistor Q2, an S pole of the MOS transistor Q1 is connected with an S pole of the MOS transistor Q4, an S pole of the MOS transistor Q2 is connected with a D pole of the MOS transistor Q3, and an S pole of the MOS transistor Q4 is connected with an S pole of the MOS transistor Q3;
the D pole of the MOS tube Q1 is connected with the positive input end of the external power supply, and the S pole of the MOS tube Q is connected with the negative input end of the external power supply;
the S pole of the MOS tube Q1 is connected with one end of the primary side of the transformer T with the middle tap through the capacitor Cr;
the S pole of the MOS tube Q2 is connected with the other end of the primary side of the transformer T with the intermediate tap through the inductor Lr.
Preferably, the rectifier bridge comprises a diode D1, a diode D2, a diode D3 and a diode D4, wherein the anode of the diode D1 is connected with the 1 pin of the secondary side of the transformer T with the middle tap, and the cathode outputs the Vo + power supply;
the cathode of the diode D4 is connected to the 1 st pin of the secondary side of the transformer T with middle tap, and the anode outputs the Vo-power source through the second switch S2;
the anode of the diode D2 is connected with the 3 pin of the secondary side of the transformer T with the middle tap, and the cathode of the diode D1 is connected with the cathode of the transformer T with the middle tap;
the anode of the diode D3 is connected with the anode of the diode D4, and the cathode is connected with the 3-pin connection of the secondary side of the transformer T with the middle tap.
Preferably, the secondary side 2 pin of the transformer T with the center tap is the center tap of the transformer T with the center tap, and the secondary side 2 pin of the transformer T with the center tap is connected to the Vo-power source through the switch S1.
Preferably, the position of the center tap of the transformer T with the center tap is adjustable.
Preferably, the first switch S1 and the second switch S2 are interlock controlled.
In this embodiment, the control mode of the control circuit includes low-voltage control and high-voltage control, the low-voltage control controls the first switch S1 to be closed and the second switch S1 to be opened so that the rectifying and filtering circuit operates in the first operating mode, and the high-voltage control controls the first switch S1 to be opened and the second switch S2 to be closed so that the rectifying and filtering circuit operates in the second operating mode;
in the first working mode, a pin 1 of a secondary winding of the transformer T is connected with an anode of a diode D1, a cathode of a diode D1 is an output positive terminal, a pin 3 of the secondary winding of the transformer is connected with an anode of a diode D2, a middle tap of the secondary winding of the transformer T1 is connected with an output negative terminal through a first switch S1, and the rectifying and filtering circuit is equivalent to full-wave rectification with a center tap.
In the second working mode, a pin 1 of a secondary winding of the transformer is connected with an anode of a diode D1 and a cathode of a diode D4, a cathode of a diode D1 is an output positive terminal, a pin 3 of a secondary winding of the transformer T1 is connected with an anode of a diode D2 and a cathode of a diode D3, an anode of a diode D4 is connected with an output negative terminal through a second switch S2, and the rectifying and filtering circuit is equivalent to full-bridge rectification.
As shown in fig. 1, a left arm composed of a MOS transistor Q1 and a MOS transistor Q4, and a right arm composed of a MOS transistor Q2 and a MOS transistor Q3.
Vin is an input end, Vout is an output end, the MOS tube Q1 and the MOS tube Q4 are connected in series to form a left bridge arm, the grid electrode of the MOS tube Q1 is connected with an input positive end Vin +, and the source electrode of the MOS tube Q4 is connected with an input negative end Vin-; the MOS tube Q2 and the MOS tube Q3 are connected in series to form a right bridge arm, the grid electrode of the MOS tube Q2 is connected with the positive input end Vin +, and the source electrode of the MOS tube Q3 is connected with the negative input end Vin-; the source of the MOS transistor Q2 is connected with the drain of the MOS transistor Q3 and is also connected with one end of a resonant inductor Lr, and the other end of the resonant inductor Lr is connected with the first input end of the transformer T; the source of the MOS transistor Q1 is connected with the drain of the MOS transistor Q4 and is also connected with one end of a resonant capacitor Cr, and the other end of the resonant capacitor Cr is connected with the second input end of the transformer T; the secondary winding of the transformer T comprises a first tap, a middle tap and a second tap; a first tap of a secondary winding of the transformer T is connected with an anode of a diode D1 and a cathode of a diode D4, a cathode of a diode D1 is connected with a cathode of a diode D2, and the secondary winding of the transformer T is also connected with an output positive Vout +; the third tap of the secondary winding of the transformer T is connected with the anode of the diode D2 and the cathode of the diode D3, the anode of the diode D3 is connected with the anode of the diode D4, the third tap is also connected with one end of a second switch S2, the other end of the second switch is connected with one end of a first switch S1 and the output negative Vout-, and the other end of the first switch S1 is connected with the middle tap of the secondary winding of the transformer T.
The low-voltage control controls the first switch S1 to be closed and the second switch S2 to be opened so that the rectifying and filtering circuit works in a first working mode, and the high-voltage control controls the first switch S1 to be opened and the second switch S2 to be closed so that the rectifying and filtering circuit works in a second working mode; the first switch S1 and the second switch S2 are switching tubes, which may be MOS tubes, relays, etc., and the switching tubes have control terminals, and can be controlled to operate in a closed state or an open state by high and low levels.
The rectification filter circuit works in a first working mode, a first tap (pin 1) of a transformer T secondary winding is connected with the anode of a diode D1, a third tap (pin 3) of the transformer T secondary winding is connected with the anode of a second diode D2, and a middle tap of the transformer T secondary winding is connected with an output negative Vout-through a first switch S1; in the modified example, the middle tap of the secondary winding of the transformer T is positioned in the middle of the first tap and the third tap of the secondary winding of the transformer T, the rectification filter circuit is equivalent to full-wave rectification with a center tap, and the output is half of full-bridge rectification.
A first tap of a secondary winding of the transformer T in the second working mode is connected with the anode of a diode D1 and the cathode of a diode D4, and the cathode of a diode D1 is connected with the cathode of a diode D2 and is also connected with an output positive Vout +; the third tap of the secondary winding of the transformer T is connected with the anode of a diode D2 and the cathode of a diode D3, the anode of a diode D4 is connected with the anode of a diode D3 and is also connected with one end of a second switch S2, the other end of the second switch S2 is connected with the output negative Vout-, and the rectifying and filtering circuit is equivalent to full-bridge rectification.
In this example, the input voltage is generally 400V, the first operation mode is suitable for the output voltage of 200V-500V, the second operation mode is suitable for the output voltage of 500V-900V, and the control signals of the first switch S1 and the second switch S2 adopt an interlocking control mode, so that the first switch S1 and the second switch S2 alternately operate, seamless switching can be realized, and control is easy.
The control circuit for wide-range output of the LLC converter solves the technical problem that the output voltage range of the LLC converter is narrow, enables the output voltage to work in a high-voltage working mode and a low-voltage working mode by controlling the on-off of the first switch S1 and the second switch S2, can be suitable for electric automobiles with different battery configurations, and meets the output voltage index of a wide range of 200V-900V, and the control signals of the first switch S1 and the second switch S2 adopt an interlocking control mode, so that the first switch S1 and the second switch S2 work alternately, seamless switching can be realized, and control is easy.
In the present invention, any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (ePROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (9)
1. A control circuit for a wide range output of an LLC converter, characterized by: the switch bridge unit comprises a switch bridge consisting of 4 MSO (minimum shift keying) tubes, and is connected with the rectification filter unit through the resonance unit;
the rectifying and filtering unit comprises a rectifying bridge, a first switch S1 for controlling the rectifying bridge to work in a full-wave rectification mode, a second switch S2 for controlling the rectifying bridge to work in a full-bridge rectification mode, a filter capacitor C and a resistor R.
2. A control circuit for a wide range output of an LLC converter as claimed in claim 1, wherein: a control circuit for controlling the first switch S1 and the second switch S2 is also included.
3. A control circuit for a wide range output of an LLC converter as claimed in claim 1, wherein: the resonance unit comprises a resonance inductor Lr, a resonance capacitor Cr and a transformer T with a middle tap, a first output end of the switch bridge is connected with one end of the primary side of the transformer T with the middle tap through the resonance inductor Lr, and a second output end of the switch bridge is connected with the other end of the primary side of the transformer T with the middle tap through the resonance capacitor Cr.
4. A control circuit for a wide range output of an LLC converter as claimed in claim 3, wherein: the two ends of the secondary side of the transformer T with the middle tap are connected with the input end of a rectifier bridge, and the output end of the rectifier bridge respectively outputs Vo + power and Vo-power;
the center tap of the secondary side of the transformer T with the middle tap is connected with the Vo-power supply through a first switch S1;
the second switch S2 is connected in series with the output end of the rectifier bridge output Vo-power supply;
the capacitor C and the resistor R are connected in parallel between the Vo + power supply and the Vo-power supply.
5. A control circuit for a wide range output of an LLC converter as claimed in claim 3, wherein: the switch bridge unit comprises an MOS transistor Q1, an MOS transistor Q2, an MOS transistor Q3 and an MOS transistor Q4, wherein the D pole of the MOS transistor Q1 is connected with the D pole of the MOS transistor Q2, the S pole of the MOS transistor Q1 is connected with the S pole of the MOS transistor Q4, the S pole of the MOS transistor Q2 is connected with the D pole of the MOS transistor Q3, and the S pole of the MOS transistor Q4 is connected with the S pole of the MOS transistor Q3;
the D pole of the MOS tube Q1 is connected with the positive input end of the external power supply, and the S pole of the MOS tube Q is connected with the negative input end of the external power supply;
the S pole of the MOS tube Q1 is connected with one end of the primary side of the transformer T with the middle tap through the capacitor Cr;
the S pole of the MOS tube Q2 is connected with the other end of the primary side of the transformer T with the intermediate tap through the inductor Lr.
6. A control circuit for a wide range output of an LLC converter as claimed in claim 5, wherein: the rectifier bridge comprises a diode D1, a diode D2, a diode D3 and a diode D4, wherein the anode of the diode D1 is connected with the 1 pin of the secondary side of the transformer T with the middle tap, and the cathode outputs the Vo + power supply;
the cathode of the diode D4 is connected to the 1 st pin of the secondary side of the transformer T with middle tap, and the anode outputs the Vo-power source through the second switch S2;
the anode of the diode D2 is connected with the 3 pin of the secondary side of the transformer T with the middle tap, and the cathode of the diode D1 is connected with the cathode of the transformer T with the middle tap;
the anode of the diode D3 is connected with the anode of the diode D4, and the cathode is connected with the 3-pin connection of the secondary side of the transformer T with the middle tap.
7. A control circuit for a wide range output of an LLC converter as claimed in claim 6, wherein: the secondary side 2 pin of the transformer T with the middle tap is the center tap of the transformer T with the middle tap, and the secondary side 2 pin of the transformer T with the middle tap is connected with the Vo-power supply through a switch S1.
8. A control circuit for a wide range output of an LLC converter as claimed in claim 7, wherein: the position of the center tap of the transformer T with the middle tap is adjustable.
9. A control circuit for a wide range output of an LLC converter as claimed in claim 7, wherein: the first switch S1 and the second switch S2 are interlock controlled.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011500428.4A CN112701918A (en) | 2020-12-18 | 2020-12-18 | Control circuit for wide-range output of LLC converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011500428.4A CN112701918A (en) | 2020-12-18 | 2020-12-18 | Control circuit for wide-range output of LLC converter |
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| CN112701918A true CN112701918A (en) | 2021-04-23 |
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| CN202011500428.4A Pending CN112701918A (en) | 2020-12-18 | 2020-12-18 | Control circuit for wide-range output of LLC converter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114142733A (en) * | 2021-11-15 | 2022-03-04 | 矽力杰半导体技术(杭州)有限公司 | Switching power supply circuit |
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| US20200106366A1 (en) * | 2018-08-03 | 2020-04-02 | Power Integrations, Inc. | Control of secondary switches based on secondary winding voltage in a power converter |
| CN211744353U (en) * | 2020-04-16 | 2020-10-23 | 石家庄通合电子科技股份有限公司 | Secondary rectification circuit of LLC circuit with wide-range output |
| CN112039355A (en) * | 2020-11-05 | 2020-12-04 | 深圳英飞源技术有限公司 | Series-parallel switching circuit and switching method for transformer winding |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20200106366A1 (en) * | 2018-08-03 | 2020-04-02 | Power Integrations, Inc. | Control of secondary switches based on secondary winding voltage in a power converter |
| CN211744353U (en) * | 2020-04-16 | 2020-10-23 | 石家庄通合电子科技股份有限公司 | Secondary rectification circuit of LLC circuit with wide-range output |
| CN112039355A (en) * | 2020-11-05 | 2020-12-04 | 深圳英飞源技术有限公司 | Series-parallel switching circuit and switching method for transformer winding |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114142733A (en) * | 2021-11-15 | 2022-03-04 | 矽力杰半导体技术(杭州)有限公司 | Switching power supply circuit |
| EP4181380A1 (en) * | 2021-11-15 | 2023-05-17 | Silergy Semiconductor Technology (Hangzhou) Ltd | Switching power supply circuit |
| CN114142733B (en) * | 2021-11-15 | 2023-10-27 | 矽力杰半导体技术(杭州)有限公司 | Switching power supply circuit |
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Application publication date: 20210423 |