CN116827140A - Soft switch resonant converter - Google Patents

Soft switch resonant converter Download PDF

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Publication number
CN116827140A
CN116827140A CN202311105773.1A CN202311105773A CN116827140A CN 116827140 A CN116827140 A CN 116827140A CN 202311105773 A CN202311105773 A CN 202311105773A CN 116827140 A CN116827140 A CN 116827140A
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CN
China
Prior art keywords
switching tube
resonant
module
tube
diode
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Application number
CN202311105773.1A
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Chinese (zh)
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CN116827140B (en
Inventor
乐卫平
林桂浩
章兵
毛元韬
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Shenzhen CSL Vacuum Science and Technology Co Ltd
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Shenzhen CSL Vacuum Science and Technology Co Ltd
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Priority to CN202311105773.1A priority Critical patent/CN116827140B/en
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—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
    • 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
    • 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
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • 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
    • H02M3/01—Resonant DC/DC converters

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention provides a soft switching resonant converter, which comprises a first switch module, a first resonance module and an output module; the first resonance module comprises a first resonance capacitor, a first coupling inductor, a first resonance diode and a first resonance switch tube; the first coupling inductor comprises a first primary winding and a first secondary winding; the first end of the first resonant mode capacitor is connected with the first end of the first primary winding, the second end of the first primary winding is connected with the second end of the first resonant switching tube, and the first end of the first resonant switching tube is connected with the second end of the first resonant capacitor and the second end of the second switching tube; the first end of the second secondary winding is connected with the anode of the first resonant diode; the power supply charges the first resonant module, and the first resonant module charges the output module. In the converter provided by the invention, the first resonance module participates in energy storage and energy release, so that the power density of the converter is improved, and the converter has high voltage output capability.

Description

Soft switch resonant converter
Technical Field
The invention relates to the technical field of converters, in particular to a soft switching resonant converter.
Background
At present, the DC/DC converter can realize higher voltage gain to meet various industrial requirements, but partial DC/DC converter has large switching loss and low efficiency, while LLC resonant converter can realize soft switching and high efficiency by virtue of the advantages of the converter, and is widely applied to high-output voltage occasions.
The capability of the traditional LLC resonant converter to output high voltage is limited, and the working capability of the high voltage output is often realized by sacrificing efficiency.
Disclosure of Invention
The invention provides a soft switching resonant converter aiming at the problem that LLC resonant converters have limited capability of outputting high voltage.
A soft switching resonant converter comprises a first switch module, a first resonance module and an output module;
the input end of the first switch module is connected with a power supply, and the output end of the first switch module is connected with the input end of the first resonance module;
the first resonance module comprises a first resonance capacitor, a first coupling inductor, a first resonance diode and a first resonance switch tube; the first coupling inductor comprises a first primary winding and a first secondary winding; the first end of the first resonant mode capacitor is connected with the first end of the first primary winding, the second end of the first primary winding is connected with the second end of the first resonant switching tube, and the first end of the first resonant switching tube is connected with the second end of the first resonant capacitor and the second end of the second switching tube; the first end of the second secondary winding is connected with the anode of the first resonant diode;
the first end of the first resonance capacitor is an input end of the first resonance module; the cathode of the first resonance diode is a first output end of the first resonance module, the second end of the first secondary winding is a second output end of the first resonance module, and the first output end and the second output end of the first resonance module are respectively connected with the output module;
The power supply charges the first resonance module through the first switch module, and the first resonance module charges the output module.
Optionally, the first switch module includes a first switch tube, a second switch tube, a first diode and a second diode;
the second end of the first switch tube is connected with the anode of the first diode, the cathode of the first diode is connected with the first end of the second switch tube, the second end of the second switch tube is connected with the anode of the second diode, and the cathode of the second diode is connected with the cathode of the power supply; the second end of the second switch tube is also connected with the second end of the first resonance capacitor;
the first end of the first switch tube is an input end of the first switch module, and the input end of the first switch module is connected with the positive electrode of the power supply; the first end of the second switch tube is the output end of the first switch module.
Optionally, the device further comprises a second switch module and a second resonance module;
the input end of the second switch module is connected with the input end of the first switch module, the output end of the second switch module is connected with the input end of the second resonance module, the output end of the second resonance module comprises a first output end and a second output end, the first output end of the second resonance module is connected with the first output end of the first resonance module, and the second output end of the second resonance module is connected with the second output end of the first resonance module;
The power supply charges the second resonance module through the second switch module, and the second resonance module charges the output module.
Optionally, the output module includes an output capacitor, a first output end of the first resonance module is connected with a first end of the output capacitor, and a second output end of the first resonance module is connected with a second end of the output capacitor.
Optionally, the output end of the first switch module and the output end of the second switch module are respectively connected with the output module.
Optionally, the output module further includes a transformer, a fifth diode, a sixth diode, a seventh diode, and an eighth diode;
the transformer comprises a third primary winding and a third secondary winding, a first end of the third primary winding is connected with the output end of the first switch module, and a second end of the third primary winding is connected with the output end of the second switch module; the first end of the third secondary winding is connected with the anode of the fifth diode and the cathode of the sixth diode, the second end of the third secondary winding is connected with the anode of the seventh diode and the cathode of the eighth diode, the cathodes of the fifth diode and the seventh diode are respectively connected with the first end of the output capacitor, and the anode of the sixth diode and the anode of the eighth diode are respectively connected with the second end of the output capacitor.
Optionally, the power supply comprises an input module, wherein the input module comprises a first inductor and a first capacitor, a first end of the first inductor and a first end of the first capacitor are respectively connected with a positive electrode of the power supply, and a second end of the first capacitor is connected with a negative electrode of the power supply; the input end of the first switch module is connected with the second end of the first inductor and is connected with the positive electrode of the power supply through the first inductor.
Optionally, the second resonance module includes a second coupling inductor, a second resonance diode, a second resonance capacitor and a second resonance switch tube; the second coupling inductor comprises a second primary winding and a second secondary winding;
the first end of the second resonant capacitor is connected with the first end of the second primary winding, the second end of the second primary winding is connected with the second end of the second resonant switching tube, the first end of the second resonant switching tube is connected with the second end of the second resonant capacitor, and the first end of the second secondary winding is connected with the anode of the second resonant diode;
the first end of the second resonance capacitor is an input end of the second resonance module, the cathode of the second resonance diode is a first output end of the second resonance module, and the second end of the second secondary winding is a second output end of the second resonance module.
Optionally, the second switching module includes a third switching tube, a fourth switching tube, a third diode and a fourth diode;
the second end of the third switching tube is connected with the anode of the third diode, the cathode of the third diode is connected with the first end of the fourth switching tube, the second end of the fourth switching tube is connected with the anode of the fourth diode, and the cathode of the fourth diode is connected with the cathode of the power supply; the second end of the fourth switching tube is also connected with the second end of the second resonance capacitor;
the first end of the third switching tube is the input end of the second switching module, and the first end of the fourth switching tube is the output end of the second switching module.
Optionally, the first end of the first primary winding and the second end of the first secondary winding are homonymous ends; the first end of the second primary winding and the second end of the second secondary winding are the same name ends.
Optionally, the first switch tube is a field effect tube, the first end of the first switch tube is a drain electrode of the field effect tube, the second end of the first switch tube is a source electrode of the field effect tube, and the third end of the first switch tube is a grid electrode of the field effect tube;
the second switching tube is a field effect tube, the first end of the second switching tube is a drain electrode of the field effect tube, the second end of the second switching tube is a source electrode of the field effect tube, and the third end of the second switching tube is a grid electrode of the field effect tube;
The third switching tube is a field effect tube, the first end of the third switching tube is a drain electrode of the field effect tube, the second end of the third switching tube is a source electrode of the field effect tube, and the third end of the third switching tube is a grid electrode of the field effect tube;
the fourth switching tube is a field effect tube, the first end of the fourth switching tube is a drain electrode of the field effect tube, the second end of the fourth switching tube is a source electrode of the field effect tube, and the third end of the second switching tube is a grid electrode of the field effect tube;
the first resonant switching tube is a field effect tube, the first end of the first resonant switching tube is a drain electrode of the field effect tube, the second end of the first resonant switching tube is a source electrode of the field effect tube, and the third end of the first resonant switching tube is a grid electrode of the field effect tube;
the second resonance switch tube is a field effect tube, the first end of the second resonance switch tube is a drain electrode of the field effect tube, the second end of the second resonance switch tube is a source electrode of the field effect tube, and the third end of the second resonance switch tube is a grid electrode of the field effect tube.
Optionally, the soft switching resonant converter sequentially operates in eight modes of operation,
the first working mode comprises that a first switching tube and a fourth switching tube are conducted, and a second switching tube, a third switching tube, a first resonance switching tube and a second resonance switching tube are turned off; before the first working mode, the first resonant capacitor and the second resonant capacitor are used as clamping capacitors to discharge, and the second switching tube is turned off at zero voltage when the first working mode is entered; the power supply charges the first resonance capacitor through the first diode and the second diode; the fifth diode and the eighth diode are conducted, and the power supply and the first inductor supply power to the load through the transformer;
Second mode of operation: the first switching tube, the third switching tube and the fourth switching tube are conducted, and the second switching tube, the first resonance switching tube and the second resonance switching tube are turned off; the third diode and the fourth diode are conducted, and the power supply charges the first inductor; the first diode is turned off in reverse bias, the third switching tube is turned on for zero current, and the output capacitor supplies energy to the load;
third mode of operation: the third switching tube, the fourth switching tube and the first resonance switching tube are conducted, and the first switching tube, the second switching tube and the second resonance switching tube are turned off; a power supply charges the first inductor; the first primary winding resonates with a first resonance capacitor, the first resonance current rises from 0, the first resonance switch tube is turned on for zero current, and the first resonance capacitor discharges the first primary winding; the output capacitor supplies energy to the load;
fourth mode of operation: the third switching tube and the fourth switching tube are conducted, and the first switching tube, the first resonance switching tube and the second resonance switching tube are turned off; a power supply charges the first inductor; the energy stored in the first primary winding provides energy to the load through the first secondary winding;
fifth mode of operation: the second switching tube and the third switching tube are conducted, and the first switching tube, the fourth switching tube, the first resonance switching tube and the second resonance switching tube are turned off; before a fifth working mode, the first resonant capacitor and the second resonant capacitor are used as clamping capacitors to discharge, and when the fifth working mode is entered, the fourth switching tube is turned off at zero voltage; the power supply charges the second resonance capacitor through the third diode and the fourth diode; the sixth diode and the seventh diode are conducted, and the power supply and the first inductor supply energy to the load through the transformer;
Sixth mode of operation: the first switching tube, the second switching tube and the third switching tube are conducted, and the fourth switching tube, the first resonance switching tube and the second resonance switching tube are turned off; the first diode and the second diode are conducted, and the power supply charges the first inductor; the third diode is turned off in reverse bias, so that the first switching tube is turned on for zero current, and the output capacitor supplies energy to the load;
seventh mode of operation: the first switching tube, the second switching tube and the second resonance switching tube are conducted, and the third switching tube, the fourth switching tube and the first resonance switching tube are turned off; a power supply charges the first inductor; the second primary winding resonates with a second resonance capacitor, the second resonance current rises from 0, so that the second resonance switch tube is turned on for zero current, the second resonance capacitor discharges the second primary winding, and the output capacitor supplies energy to the load;
eighth mode of operation: the first switching tube and the second switching tube are conducted, and the third switching tube, the fourth switching tube, the first resonance switching tube and the second resonance switching tube are turned off; a power supply charges the first inductor; the second primary winding and the second resonance capacitor are in series resonance, and the second resonance switch tube is turned off at zero voltage; the energy stored in the second primary winding provides energy to the load through the second secondary winding.
The beneficial effects are that: in the soft switching resonant converter provided by the embodiment, the first coupling inductor in the first resonant module and the first resonant capacitor perform LC resonance, and the first resonant switching tube realizes soft switching; meanwhile, the power supply charges the first resonance module, the first resonance module charges energy, and then the first resonance module discharges the output module, namely, the first resonance module can store energy and discharge energy, so that the power density of the converter is improved, the high efficiency of the converter is further realized, and the high voltage output capacity of the converter is improved.
Drawings
The invention will now be described in further detail with reference to the drawings and to specific embodiments.
Fig. 1 is a schematic diagram of a topology of a soft switching converter according to the present exemplary embodiment.
Fig. 2 is a second schematic diagram of a topology structure of a soft switching converter according to the present exemplary embodiment.
Fig. 3 is an equivalent circuit diagram of a first operation mode of the soft switching converter according to the present exemplary embodiment.
Fig. 4 is an equivalent circuit diagram of a second operation mode of the soft switching converter according to the present exemplary embodiment.
Fig. 5 is an equivalent circuit diagram of a third operation mode of the soft switching converter according to the present exemplary embodiment.
Fig. 6 is an equivalent circuit diagram of a fourth operation mode of the soft switching converter according to the present exemplary embodiment.
Fig. 7 is an equivalent circuit diagram of a fifth operation mode of the soft switching converter according to the present exemplary embodiment.
Fig. 8 is an equivalent circuit diagram of a sixth operation mode of the soft switching converter according to the present exemplary embodiment.
Fig. 9 is an equivalent circuit diagram of a seventh operation mode of the soft switching converter according to the present exemplary embodiment.
Fig. 10 is an equivalent circuit diagram of an eighth operation mode of the soft switching converter according to the present exemplary embodiment.
Fig. 11 is a diagram of main operation waveforms of a soft switching converter provided in the present exemplary embodiment in one switching cycle.
Reference numerals:
vin, power supply; l1, a first inductor; d1, a first diode; d2, a second diode; d3, a third diode; d4, a fourth diode; d5, a fifth diode; d6, a sixth diode; d7, a seventh diode; d8, an eighth diode; s1, a first switching tube; s2, a second switching tube; s3, a third switching tube; s4, a fourth switching tube; t, a transformer; l1k, first leakage inductance; c1, a first capacitor; co, output capacitance; RL, load; la1, a first primary winding; la2, a first secondary winding; lb1, a second primary winding; lb2, a second secondary winding; sa, a first resonant switching tube; sb, a second resonant switching tube; da. A first resonant diode; db. A second resonant diode; ca. A first resonant capacitor; cb. And a second resonance capacitor.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art. In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Examples
As shown in fig. 1, the present embodiment provides a soft-switching resonant converter, which includes an input module, a first switch module, a first resonance module, a second switch module, and an output module; the first resonance module and the second resonance module are symmetrically arranged, and the first resonance module and the second resonance module participate in the energy transfer process, so that the power density is improved.
Specifically, the input module includes a first inductor L1 and a first capacitor C1, where the first capacitor C1 is a filter capacitor; the first end of the first capacitor C1 and the first end of the first inductor L1 are respectively connected with the positive electrode of the power supply Vin, the second end of the first capacitor C1 is connected with the negative electrode of the power supply Vin, and the second end of the first inductor L1 is connected with the first switch module.
The first switch module comprises a first switch tube S1, a second switch tube S2, a first diode D1 and a second diode D2. The second end of the first switch tube S1 is connected with the anode of the first diode D1, the cathode of the first diode D1 is connected with the first end of the second switch tube S2, the second end of the second switch tube S2 is connected with the anode of the second diode D2, and the cathode of the second diode D2 is connected with the cathode of the power source Vin. The first end of the first switch tube S1 is an input end of a first switch module, and the input end of the first switch module is connected with the second end of the first inductor L1 and is connected with the positive electrode of the power supply Vin through the first inductor L1; the first end of the second switching tube S2 is the output end of the first switching module.
Specifically, the first resonance module includes a first resonance capacitor Ca, a first coupling inductance, a first resonance diode Da, and a first resonance switch tube Sa; the first coupling inductor comprises a first primary winding La1 and a first secondary winding La2; the first end of the first resonant mode capacitor is connected with the first end of the first primary winding La1, the second end of the first primary winding La1 is connected with the second end of the first resonant switching tube Sa, and the first end of the first resonant switching tube Sa is connected with the second end of the first resonant capacitor Ca and the second end of the second switching tube S2; the first end of the second secondary winding Lb2 is connected to the anode of the first resonant diode Da. The first end of the first resonance capacitor Ca is an input end of the first resonance module and is connected with the first end of the second switch tube S2; the cathode of the first resonance diode Da is a first output end of the first resonance module, the second end of the first secondary winding La2 is a second output end of the first resonance module, and the first output end and the second output end of the first resonance module are respectively connected with the output module. The power Vin charges the first resonance module through the first switch module, and the first resonance module charges the output module. In this embodiment, the first end of the first primary winding La1 and the second end of the first secondary winding La2 are the same name. The second resonance module structure is the same as the first resonance module, and comprises a second coupling inductance, a second resonance diode Db, a second resonance capacitor Cb and a second resonance switch tube Sb; the second coupling inductance includes a second primary winding Lb1 and a second secondary winding Lb2. The first end of the second resonant capacitor Cb is connected to the first end of the second primary winding Lb1, the second end of the second primary winding Lb1 is connected to the second end of the second resonant switching tube Sb, the first end of the second resonant switching tube Sb is connected to the second end of the second resonant capacitor Cb, and the first end of the second secondary winding Lb2 is connected to the anode of the second resonant diode Db. The first end of the second resonant capacitor Cb is an input end of the second resonant module, the cathode of the second resonant diode Db is a first output end of the second resonant module, and the second end of the second secondary winding Lb2 is a second output end of the second resonant module. The input end of the second resonance module is connected with the output end of the second switch module; the first output end of the second resonance module is connected with the first output end of the first resonance module, and the second output end of the second resonance module is connected with the second output end of the first resonance module. In this embodiment, the first end of the second primary winding Lb1 and the second end of the second secondary winding Lb2 are the same name.
The second switching module comprises a third switching tube S3, a fourth switching tube S4, a third diode D3 and a fourth diode D4. The second end of the third switching tube S3 is connected with the anode of a third diode D3, the cathode of the third diode D3 is connected with the first end of a fourth switching tube S4, the second end of the fourth switching tube S4 is connected with the anode of a fourth diode D4, and the cathode of the fourth diode D4 is connected with the cathode of a power supply Vin; the second end of the fourth switching tube S4 is further connected to the second end of the second resonant capacitor Cb. The first end of the third switching tube S3 is an input end of a second switching module, and the input end of the second switching module is connected with the input end of the first switching module. The first end of the fourth switching tube S4 is the output end of the second switching module, and the output end of the second switching module is connected with the input end of the second resonance module. The power Vin charges the second resonance module through the second switch module, and the second resonance module charges the output module.
The output module comprises an output capacitor Co, a first output end of the first resonance module is connected with a first end of the output capacitor Co, a second output end of the first resonance module is connected with a second end of the output capacitor Co, and a load RL is connected with two ends of the output capacitor Co in parallel.
The output module further includes a transformer T, a fifth diode D5, a sixth diode D6, a seventh diode D7, and an eighth diode D8. The transformer T comprises a third primary winding and a third secondary winding, and also comprises an equivalent first leakage inductance L1k; the first end of the third primary winding is connected with the end of the first leakage inductance L1k, the second end of the first leakage inductance L1k is connected with the output end of the first switch module, namely, the first end of the third primary winding is connected with the output end of the first switch module through the first leakage inductance L1 k. The second end of the third primary winding is connected with the output end of the second switch module; the first end of the third secondary winding is connected with the anode of the fifth diode D5 and the cathode of the sixth diode D6, the second end of the third secondary winding is connected with the anode of the seventh diode D7 and the cathode of the eighth diode D8, the cathodes of the fifth diode D5 and the seventh diode D7 are respectively connected with the first end of the output capacitor Co, and the anode of the sixth diode D6 and the anode of the eighth diode D8 are respectively connected with the second end of the output capacitor Co.
In this embodiment, the output capacitor Co in the output module is connected to the output end of the first resonant module and the output end of the second resonant module, the energy stored in the first resonant module and the energy stored in the second resonant module can be released to the output capacitor Co, the output capacitor Co supplies power to the load RL, and therefore the first resonant module and the second resonant module also participate in the energy transfer process, and the energy storage and the energy release of the first resonant module and the second resonant module realize energy recovery, so that the power density is improved, the high efficiency of the converter is further realized, and the high voltage output capability of the converter is improved. Meanwhile, a transformer T in the output module is respectively connected with the output end of the first switch module and the output end of the second switch module, and a power supply Vin and the first inductor L1 can supply energy to a load RL through the transformer T; further improving the high voltage output capability of the converter.
In this embodiment, the switching tubes S1, S2, S3, S4 are field effect transistors, specifically, the first end of the first switching tube S1 is the drain electrode of the field effect transistor, the second end of the first switching tube S1 is the source electrode of the field effect transistor, and the third end of the first switching tube S1 is the gate electrode of the field effect transistor; the first end of the second switching tube S2 is the drain electrode of the field effect tube, the second end of the second switching tube S2 is the source electrode of the field effect tube, and the third end of the second switching tube S2 is the grid electrode of the field effect tube; the first end of the third switching tube S3 is the drain electrode of the field effect tube, the second end of the third switching tube S3 is the source electrode of the field effect tube, the third end of the third switching tube S3 is the grid electrode of the field effect tube; the first end of the fourth switching tube S4 is the drain electrode of the field effect tube, the second end of the fourth switching tube S4 is the source electrode of the field effect tube, and the third end of the second switching tube S2 is the grid electrode of the field effect tube; the resonant switching tubes Sa and Sb are also field effect transistors, the first end of the first resonant switching tube Sa is the drain electrode of the field effect transistor, the second end of the first resonant switching tube Sa is the source electrode of the field effect transistor, and the third end of the first resonant switching tube Sa is the grid electrode of the field effect transistor; the first end of the second resonant switching tube Sb is the drain electrode of the field effect tube, the second end of the second resonant switching tube Sb is the source electrode of the field effect tube, and the third end of the second resonant switching tube Sb is the grid electrode of the field effect tube.
The control of the switching transistors S1, S2, S3, S4 and the control of the resonant switching transistors Sa, sb can make the converter operate in the following 8 operation modes in one switching cycle. The main operation waveform diagram of one switching period is shown in fig. 11, ts is the duration of one switching period, and the first six coordinate axes respectively show the on states of the switching tubes S1, S2, S3, S4 and the resonance switching tubes Sa, sb, and the shaded area represents the on state;for the current of the first inductance L1, +.>For the current of the first diode D1, +.>For the current of the third diode D3, +.>For the voltage of the first capacitor C1, +.>The voltage of the second capacitor; the interval t0-t1 is a first working mode, the interval t1-t2 is a second working mode, the interval t2-t3 is a third working mode, the interval t3-t4 is a fourth working mode, the interval t4-t5 is a fifth working mode, the interval t5-t6 is a sixth working mode, the interval t6-t7 is a seventh working mode, and the interval t7-t8 is an eighth working mode.
The equivalent circuit diagram is shown in fig. 3, the first switching tube S1 and the fourth switching tube S4 are turned on, and the second switching tube S2, the third switching tube S3, the first resonant switching tube Sa and the second resonant switching tube Sb are turned off; before the first working mode, the first resonant capacitor Ca and the second resonant capacitor Cb are used as clamping capacitors to be fully discharged, and the second switching tube S2 is turned off at zero voltage when the first working mode is entered; the power supply Vin charges the first resonance capacitor Ca through the first diode D1 and the second diode D2; the fifth diode D5 and the eighth diode D8 are turned on, the power source Vin and the first inductor L1 supply power to the load RL through the transformer T, and the current flowing through the first inductor L1 decreases linearly.
Second mode of operation: as shown in fig. 4, the equivalent circuit diagram is that the first switching tube S1, the third switching tube S3 and the fourth switching tube S4 are turned on, and the second switching tube S2, the first resonant switching tube Sa and the second resonant switching tube Sb are turned off; the third diode D3 and the fourth diode D4 are turned on, the power Vin charges the first inductor L1, and the current flowing through the first inductor L1 increases linearly; the first diode D1 is turned off in reverse bias, and the current flowing through the leakage inductance of the transformer T is transmitted through the third switching tube S3, so that the third switching tube S3 is turned on for zero current, and the output capacitor Co supplies energy to the load RL.
Third mode of operation: as shown in fig. 5, the equivalent circuit diagram is that the third switching tube S3, the fourth switching tube S4 and the first resonant switching tube Sa are turned on, and the first switching tube S1, the second switching tube S2 and the second resonant switching tube Sb are turned off; the power supply Vin charges the first inductor L1, and the current flowing through the first inductor L1 rises linearly; the first primary winding La1 resonates with a first resonance capacitor Ca, the first resonance current rises from 0, the first resonance switch tube Sa is turned on for zero current, and the first resonance capacitor Ca discharges the first primary winding La 1; the output capacitor Co supplies energy to the load RL.
Fourth mode of operation: as shown in fig. 6, the equivalent circuit diagram is that the third switching tube S3 and the fourth switching tube S4 are turned on, and the first switching tube S1, the first resonant switching tube Sa and the second resonant switching tube Sb are turned off; the power supply Vin charges the first inductor L1, and the current flowing through the first inductor L1 rises linearly; the first primary winding La1 and the first resonance capacitor Ca are in series resonance, and the first resonance switch tube Sa is turned off at zero voltage; the energy stored in the first primary winding La1 supplies energy to the load RL through the first secondary winding La 2.
Fifth mode of operation: as shown in fig. 7, the equivalent circuit diagram is that the second switching tube S2 and the third switching tube S3 are turned on, and the first switching tube S1, the fourth switching tube S4, the first resonant switching tube Sa and the second resonant switching tube Sb are turned off; before the fifth working mode, the first resonant capacitor Ca and the second resonant capacitor Cb are used as clamping capacitors to be fully discharged, and the fourth switching tube S4 is turned off at zero voltage when the fifth working mode is entered; the power Vin charges the second resonant capacitor Cb through the third diode D3 and the fourth diode D4; the sixth diode D6 and the seventh diode D7 are turned on, the power source Vin and the first inductor L1 supply energy to the load RL through the transformer T, and the current flowing through the first inductor L1 decreases linearly.
Sixth mode of operation: as shown in fig. 8, the equivalent circuit diagram is that the first switching tube S1, the second switching tube S2 and the third switching tube S3 are turned on, and the fourth switching tube S4, the first resonant switching tube Sa and the second resonant switching tube Sb are turned off; the first diode D1 and the second diode D2 are conducted, the power supply Vin charges the first inductor L1, and the current flowing through the first inductor L1 rises linearly; the third diode D3 is turned off in reverse bias, and the current flowing through the leakage inductance of the transformer T is transmitted through the first switching tube S1, so that the first switching tube S1 is turned on for zero current, and the output capacitor Co supplies energy to the load RL.
Seventh mode of operation: as shown in fig. 9, the equivalent circuit diagram is that the first switching tube S1, the second switching tube S2 and the second resonant switching tube Sb are turned on, and the third switching tube S3, the fourth switching tube S4 and the first resonant switching tube Sa are turned off; the power supply Vin charges the first inductor L1, and the current flowing through the first inductor L1 rises linearly; the second primary winding Lb1 resonates with the second resonant capacitor Cb, and the second resonant current rises from 0, so that the second resonant switching tube Sb is turned on for zero current, the second resonant capacitor Cb discharges the second primary winding Lb1, and the output capacitor Co supplies energy to the load RL.
Eighth mode of operation: as shown in fig. 10, the equivalent circuit diagram is that the first switching tube S1 and the second switching tube S2 are turned on, and the third switching tube S3, the first resonant switching tube Sa and the second resonant switching tube Sb are turned off; the power supply Vin charges the first inductor L1, and the current flowing through the first inductor L1 rises linearly; the second primary winding Lb1 and the second resonant capacitor Cb are in series resonance, and the second resonant switching tube Sb is turned off at zero voltage; the energy stored in the second primary winding Lb1 supplies energy to the load RL through the second secondary winding Lb 2.
The soft switching resonant converter provided by the embodiment can realize soft switching by the switching tubes S1, S2, S3 and S4 and the resonant switching tubes Sa and Sb, meanwhile, the first coupling inductor and the first resonant capacitor Ca form an LC resonant structure, the second coupling inductor and the second resonant capacitor Cb also form an LC resonant structure, and the two LC resonant structures store energy and release energy to recover energy and improve power density, so that the high efficiency of the converter is realized, and the high voltage output capability of the converter is improved.
It is noted that the flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
It will be clearly understood by those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described system, apparatus and module may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.
In the several embodiments provided by the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. The above-described apparatus embodiments are merely illustrative, and the division of the modules is merely a logical function division, and there may be additional divisions when actually implemented, and for example, multiple modules or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, indirect coupling or communication connection of devices or modules, electrical, mechanical, or other form.
The modules described as separate components may or may not be physically separate, and components shown as modules may or may not be physical modules, i.e., may be located in one place, or may be distributed over a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional module in each embodiment of the present application may be integrated into one processing module, or each module may exist alone physically, or two or more modules may be integrated into one module.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application, and are intended to be included within the scope of the appended claims and description.

Claims (12)

1. The soft switching resonant converter is characterized by comprising a first switch module, a first resonance module and an output module;
the input end of the first switch module is connected with a power supply (Vin), and the output end of the first switch module is connected with the input end of the first resonance module;
the first resonance module comprises a first resonance capacitor (Ca), a first coupling inductor, a first resonance diode (Da) and a first resonance switch tube (Sa); the first coupling inductor comprises a first primary winding (La 1) and a first secondary winding (La 2); a first end of the first resonant mode capacitor is connected with a first end of the first primary winding (La 1), a second end of the first primary winding (La 1) is connected with a second end of the first resonant switching tube (Sa), and the first end of the first resonant switching tube (Sa) is connected with a second end of the first resonant capacitor (Ca) and a second end of the second switching tube (S2); a first end of the second secondary winding (Lb 2) is connected with an anode of the first resonant diode (Da);
The first end of the first resonance capacitor (Ca) is the input end of the first resonance module; the cathode of the first resonant diode (Da) is a first output end of the first resonant module, the second end of the first secondary winding (La 2) is a second output end of the first resonant module, and the first output end and the second output end of the first resonant module are respectively connected with the output module;
the power supply (Vin) charges the first resonance module through the first switching module, and the first resonance module charges the output module.
2. A soft switching resonant converter according to claim 1, characterized in that the first switching module comprises a first switching tube (S1), a second switching tube (S2), a first diode (D1) and a second diode (D2);
the second end of the first switching tube (S1) is connected with the anode of the first diode (D1), the cathode of the first diode (D1) is connected with the first end of the second switching tube (S2), the second end of the second switching tube (S2) is connected with the anode of the second diode (D2), and the cathode of the second diode (D2) is connected with the cathode of the power supply (Vin); the second end of the second switch tube (S2) is also connected with the second end of the first resonance capacitor (Ca);
The first end of the first switch tube (S1) is an input end of a first switch module, and the input end of the first switch module is connected with the positive electrode of the power supply (Vin); the first end of the second switch tube (S2) is the output end of the first switch module.
3. The soft-switching resonant converter of claim 2, further comprising a second switching module and a second resonant module;
the input end of the second switch module is connected with the input end of the first switch module, the output end of the second switch module is connected with the input end of the second resonance module, the output end of the second resonance module comprises a first output end and a second output end, the first output end of the second resonance module is connected with the first output end of the first resonance module, and the second output end of the second resonance module is connected with the second output end of the first resonance module;
the power supply (Vin) charges the second resonance module through the second switching module, and the second resonance module charges the output module.
4. A soft switching resonant converter according to claim 3, characterized in that the output module comprises an output capacitor (Co), the first output terminal of the first resonant module being connected to a first terminal of the output capacitor (Co), and the second output terminal of the first resonant module being connected to a second terminal of the output capacitor (Co).
5. The soft switching resonant converter of claim 4, wherein the output of the first switching module and the output of the second switching module are each coupled to the output module.
6. A soft switching resonant converter according to claim 5, wherein the output module further comprises a transformer (T), a fifth diode (D5), a sixth diode (D6), a seventh diode (D7) and an eighth diode (D8);
the transformer (T) comprises a third primary winding and a third secondary winding, a first end of the third primary winding is connected with the output end of the first switch module, and a second end of the third primary winding is connected with the output end of the second switch module; the first end of the third secondary winding is connected with the anode of the fifth diode (D5) and the cathode of the sixth diode (D6), the second end of the third secondary winding is connected with the anode of the seventh diode (D7) and the cathode of the eighth diode (D8), the cathodes of the fifth diode (D5) and the seventh diode (D7) are respectively connected with the first end of the output capacitor (Co), and the anodes of the sixth diode (D6) and the eighth diode (D8) are respectively connected with the second end of the output capacitor (Co).
7. The soft-switching resonant converter of claim 6, further comprising an input module, the input module comprising a first inductor (L1) and a first capacitor (C1), the first end of the first inductor (L1) and the first end of the first capacitor (C1) being respectively connected to the positive pole of the power source (Vin), the second end of the first capacitor (C1) being connected to the negative pole of the power source (Vin); the input end of the first switch module is connected with the second end of the first inductor (L1) and is connected with the positive electrode of the power supply (Vin) through the first inductor (L1).
8. A soft switching resonant converter according to claim 7, characterized in that the second resonant module comprises a second coupling inductance, a second resonant diode (Db), a second resonant capacitor (Cb) and a second resonant switching tube (Sb); the second coupling inductance comprises a second primary winding (Lb 1) and a second secondary winding (Lb 2);
the first end of the second resonant capacitor (Cb) is connected with the first end of the second primary winding (Lb 1), the second end of the second primary winding (Lb 1) is connected with the second end of the second resonant switching tube (Sb), the first end of the second resonant switching tube (Sb) is connected with the second end of the second resonant capacitor (Cb), and the first end of the second secondary winding (Lb 2) is connected with the anode of the second resonant diode (Db);
The first end of the second resonant capacitor (Cb) is an input end of the second resonant module, the cathode of the second resonant diode (Db) is a first output end of the second resonant module, and the second end of the second secondary winding (Lb 2) is a second output end of the second resonant module.
9. A soft switching resonant converter according to claim 8, characterized in that the second switching module comprises a third switching tube (S3), a fourth switching tube (S4), a third diode (D3) and a fourth diode (D4);
the second end of the third switching tube (S3) is connected with the anode of the third diode (D3), the cathode of the third diode (D3) is connected with the first end of the fourth switching tube (S4), the second end of the fourth switching tube (S4) is connected with the anode of the fourth diode (D4), and the cathode of the fourth diode (D4) is connected with the cathode of the power supply (Vin); the second end of the fourth switching tube (S4) is also connected with the second end of the second resonant capacitor (Cb);
the first end of the third switching tube (S3) is the input end of the second switching module, and the first end of the fourth switching tube (S4) is the output end of the second switching module.
10. A soft switching resonant converter according to claim 8, characterized in that the first end of the first primary winding (La 1) and the second end of the first secondary winding (La 2) are synonymous ends; the first end of the second primary winding (Lb 1) and the second end of the second secondary winding (Lb 2) are the same name ends.
11. The soft-switching resonant converter of claim 9, wherein the first switching tube (S1) is a field-effect tube, a first end of the first switching tube (S1) is a drain electrode of the field-effect tube, a second end of the first switching tube (S1) is a source electrode of the field-effect tube, and a third end of the first switching tube (S1) is a gate electrode of the field-effect tube;
the second switching tube (S2) is a field effect tube, the first end of the second switching tube (S2) is a drain electrode of the field effect tube, the second end of the second switching tube (S2) is a source electrode of the field effect tube, and the third end of the second switching tube (S2) is a grid electrode of the field effect tube;
the third switching tube (S3) is a field effect tube, the first end of the third switching tube (S3) is a drain electrode of the field effect tube, the second end of the third switching tube (S3) is a source electrode of the field effect tube, and the third end of the third switching tube (S3) is a grid electrode of the field effect tube;
the fourth switching tube (S4) is a field effect tube, the first end of the fourth switching tube (S4) is a drain electrode of the field effect tube, the second end of the fourth switching tube (S4) is a source electrode of the field effect tube, and the third end of the second switching tube (S2) is a grid electrode of the field effect tube;
the first resonant switching tube (Sa) is a field effect tube, the first end of the first resonant switching tube (Sa) is a drain electrode of the field effect tube, the second end of the first resonant switching tube (Sa) is a source electrode of the field effect tube, and the third end of the first resonant switching tube (Sa) is a grid electrode of the field effect tube;
The second resonance switch tube (Sb) is a field effect tube, the first end of the second resonance switch tube (Sb) is a drain electrode of the field effect tube, the second end of the second resonance switch tube (Sb) is a source electrode of the field effect tube, and the third end of the second resonance switch tube (Sb) is a grid electrode of the field effect tube.
12. The soft-switching resonant converter of claim 9, wherein the soft-switching resonant converter operates in sequence in eight modes of operation,
the first working mode comprises that a first switching tube (S1) and a fourth switching tube (S4) are conducted, and a second switching tube (S2), a third switching tube (S3), a first resonance switching tube (Sa) and a second resonance switching tube (Sb) are turned off; before the first working mode, the first resonant capacitor (Ca) and the second resonant capacitor (Cb) are used as clamping capacitors to discharge, and when the first working mode is entered, the second switching tube (S2) is turned off at zero voltage; the power supply (Vin) charges the first resonance capacitor (Ca) through the first diode (D1) and the second diode (D2); the fifth diode (D5) and the eighth diode (D8) are conducted, and the power supply (Vin) and the first inductor (L1) supply power to the load (RL) through the transformer (T);
Second mode of operation: the first switching tube (S1), the third switching tube (S3) and the fourth switching tube (S4) are turned on, and the second switching tube (S2), the first resonant switching tube (Sa) and the second resonant switching tube (Sb) are turned off; the third diode (D3) and the fourth diode (D4) are conducted, and the power supply (Vin) charges the first inductor (L1); the first diode (D1) is turned off in a reverse bias way, the third switch tube (S3) is turned on for zero current, and the output capacitor (Co) supplies energy to the load (RL);
third mode of operation: the third switching tube (S3), the fourth switching tube (S4) and the first resonant switching tube (Sa) are turned on, and the first switching tube (S1), the second switching tube (S2) and the second resonant switching tube (Sb) are turned off; a power supply (Vin) charges the first inductor (L1); the first primary winding (La 1) resonates with a first resonance capacitor (Ca), the first resonance current rises from 0, the first resonance switch tube (Sa) is opened for zero current, and the first resonance capacitor (Ca) discharges the first primary winding (La 1); the output capacitance (Co) provides energy to the load (RL);
fourth mode of operation: the third switching tube (S3) and the fourth switching tube (S4) are turned on, and the first switching tube (S1), the first resonant switching tube (Sa) and the second resonant switching tube (Sb) are turned off; a power supply (Vin) charges the first inductor (L1); the energy stored in the first primary winding (La 1) is supplied to the load (RL) via the first secondary winding (La 2);
Fifth mode of operation: the second switching tube (S2) and the third switching tube (S3) are turned on, and the first switching tube (S1), the fourth switching tube (S4), the first resonant switching tube (Sa) and the second resonant switching tube (Sb) are turned off; before a fifth working mode, the first resonant capacitor (Ca) and the second resonant capacitor (Cb) are used as clamping capacitors for discharging, and when the fifth working mode is entered, the fourth switching tube (S4) is turned off at zero voltage; the power supply (Vin) charges the second resonance capacitor (Cb) through the third diode (D3) and the fourth diode (D4); the sixth diode (D6) and the seventh diode (D7) are conducted, and the power supply (Vin) and the first inductor (L1) supply energy to the load (RL) through the transformer (T);
sixth mode of operation: the first switching tube (S1), the second switching tube (S2) and the third switching tube (S3) are turned on, and the fourth switching tube (S4), the first resonant switching tube (Sa) and the second resonant switching tube (Sb) are turned off; the first diode (D1) and the second diode (D2) are conducted, and the power supply (Vin) charges the first inductor (L1); the third diode (D3) is turned off in a reverse bias way, so that the first switching tube (S1) is turned on for zero current, and the output capacitor (Co) supplies energy to the load (RL);
Seventh mode of operation: the first switching tube (S1), the second switching tube (S2) and the second resonance switching tube (Sb) are turned on, and the third switching tube (S3), the fourth switching tube (S4) and the first resonance switching tube (Sa) are turned off; a power supply (Vin) charges the first inductor (L1); the second primary winding (Lb 1) resonates with a second resonant capacitor (Cb), and the second resonant current rises from 0, so that the second resonant switching tube (Sb) is opened for zero current, the second resonant capacitor (Cb) discharges the second primary winding (Lb 1), and the output capacitor (Co) supplies energy to the load (RL);
eighth mode of operation: the first switching tube (S1) and the second switching tube (S2) are turned on, and the third switching tube (S3), the fourth switching tube (S4), the first resonance switching tube (Sa) and the second resonance switching tube (Sb) are turned off; a power supply (Vin) charges the first inductor (L1); the energy stored in the second primary winding (Lb 1) is supplied to the load (RL) via the second secondary winding (Lb 2).
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JPH0739149A (en) * 1993-07-22 1995-02-07 Murata Mfg Co Ltd Rectifying and smoothing circuit for voltage resonance converter
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CN115765446A (en) * 2023-01-10 2023-03-07 深圳市恒运昌真空技术有限公司 Soft switch high-boost converter
CN116073662A (en) * 2022-12-20 2023-05-05 珠海格力电器股份有限公司 Soft switching device of switching power supply, switching power supply and control method of switching power supply
CN116131620A (en) * 2023-01-12 2023-05-16 安徽微伏特电源科技有限公司 Staggered parallel passive buffer flyback inverter topology circuit with high power factor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0739149A (en) * 1993-07-22 1995-02-07 Murata Mfg Co Ltd Rectifying and smoothing circuit for voltage resonance converter
US20150049520A1 (en) * 2013-08-15 2015-02-19 Fsp-Powerland Technology Inc. Resonant converter and controlling method thereof
CN108964477A (en) * 2018-09-19 2018-12-07 矽力杰半导体技术(杭州)有限公司 Mode of resonance switch converters
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