CN110149055B - Resonance converter - Google Patents

Resonance converter Download PDF

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Publication number
CN110149055B
CN110149055B CN201910606156.7A CN201910606156A CN110149055B CN 110149055 B CN110149055 B CN 110149055B CN 201910606156 A CN201910606156 A CN 201910606156A CN 110149055 B CN110149055 B CN 110149055B
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side winding
resonant
switch
capacitor
secondary side
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CN201910606156.7A
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CN110149055A (en
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姚宇桐
洪宗良
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Yaruiyuan Technology Shenzhen Co ltd
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Yaruiyuan Technology Shenzhen Co ltd
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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
    • H02M3/3353—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 at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

The invention discloses a resonant converter, which comprises a switch module, a transformer, an output circuit, a resonant circuit and a safety capacitor, wherein the switch module is connected with the transformer; the switch module is connected between the input voltage and the ground, and the transformer comprises a primary side winding and at least one secondary side winding; the output circuit is connected between the at least one secondary side winding and a load; the resonant circuit is coupled between the primary side winding and the switch module and comprises at least one leakage inductance; the safety capacitor is connected between the leakage inductance and the switch module; the resonant converter has the advantages that the isolation requirement of dual or enhanced insulation can be met by the safety capacitor, the transformer does not need to bear the traditional safety isolation requirement, low-cost wires or high-efficiency wires such as stranded wires and flat wires can be further used, so that the framework and the shape of the transformer are greatly reduced, and the transformer with smaller volume is obtained.

Description

Resonance converter
The technical field is as follows:
the present invention relates to a resonant converter (LLC converter), and more particularly, to a resonant converter that can greatly reduce the volume of the transformer under the specification of safety isolation requirements.
Background art:
safety standards are the standard of safety that provides specific statements and guidance on the equipment and components being manufactured to provide a safe and high quality product to the end user. In the safety certification of power supplies, transformers are a major key point, and generally, there are insulation distance requirements, wire requirements, part requirements and the like for safety specifications to which the transformers need attention, where the most significant part of the volume influence of the transformers comes from the requirement of the insulation distance. The insulation distance refers to the shortest allowable space distance between two conductive parts or between a conductive part and an equipment protection interface, namely the shortest distance for realizing insulation through air under the condition of stable and safe electrical performance.
Taking UL certification as an example, the insulation grade is divided into 5 types of operation insulation, basic insulation, double insulation, auxiliary insulation, reinforced insulation and the like according to the principle of protecting users so as to ensure the safety of the product in use, and the judgment method of whether the structure of the transformer conforms to the safety regulations is that the working voltage of the transformer is used as the basis, the insulation distance is found out after the working voltage is known, and then the structure is checked by pushing back and forth according to the working voltage. The key points of the inspection include primary coil to secondary coil, primary coil to magnetic core, and secondary coil to magnetic core, etc., wherein the distance between the primary coil to the secondary coil at least needs to satisfy the specification of dual or enhanced insulation, and the transformer needs to use three layers of insulated wires and a special frame for winding to obtain UL certification.
The invention content is as follows:
in a traditional active-clamping flyback converter, an LLC circuit is used for resonance, zero-voltage switching between half-bridge switches can be achieved, and high conversion efficiency is obtained. The transformer has the function of isolating and insulating secondary side electric appliances, so that wires meeting safety standards and a specific winding mode are required to be used, and double or reinforced insulation standards are met to reach the safety standards, so that the cost of the transformer is high, and the circuit size is large.
In view of the above, a main technical means of the present invention is to provide a resonant converter, including:
a switch module: is connected between the input voltage and the ground;
a transformer: comprises a primary side winding and at least one secondary side winding;
an output circuit: the secondary side winding is connected between the at least one secondary side winding and a load;
a resonance circuit: the switch module is coupled between the primary side winding and the switch module and comprises at least one leakage inductance;
safety capacitor: connected between the leakage inductance and the switch module.
Preferably, the output circuit includes a first diode, a second diode, and a voltage stabilizing capacitor, and at least one of the secondary windings includes a first secondary winding and a second secondary winding, the first secondary winding is connected between an anode of the first diode and the second secondary winding, the second secondary winding is connected between an anode of the second diode and the first secondary winding, and the voltage stabilizing capacitor is connected between a common point of a cathode of the first diode and a cathode of the second diode and a common point of the first secondary winding and the second secondary winding.
Preferably, the switch module includes a first switch and a second switch, the first switch is connected between the input voltage and the second switch, and the second switch is connected between the first switch and ground.
Preferably, the safety capacitor is connected between a common point of the first switch and the second switch and the leakage inductance.
Preferably, the safety capacitor is connected between ground and the leakage inductance.
Preferably, the safety capacitor is connected between the input voltage and the leakage inductance.
Preferably, the resonant circuit further includes a first resonant capacitor and a resonant inductor, the leakage inductance is connected to the safety capacitor and one end of the primary winding, the first resonant capacitor is connected to the switch module and the other end of the primary winding, and the resonant inductor is bridged across two ends of the primary winding.
Preferably, the resonant circuit further includes a second resonant capacitor connected between the other end of the primary winding and the input voltage.
Preferably, the distance of electrical isolation between the primary winding and at least one of the secondary windings is between 0.1mm and 8 mm.
In conclusion, the beneficial effects of the invention are as follows:
1. the resonant converter can meet the dual or enhanced insulation isolation requirement through the safety capacitor, and the transformer does not need to bear the traditional safety isolation requirement;
2. the resonance converter can use low-cost wires or high-efficiency wires such as stranded wires and flat wires, so that the framework and the shape of the transformer are greatly reduced, and the transformer with smaller volume is obtained.
Description of the drawings:
fig. 1 is a circuit diagram of a resonant converter in accordance with embodiment 1 of the present invention.
Fig. 2 is a circuit diagram of a resonant converter in embodiment 2 of the invention.
Fig. 3 is a circuit diagram of a resonant converter in accordance with embodiment 3 of the present invention.
Fig. 4 is a circuit diagram of a resonant converter in accordance with embodiment 4 of the present invention.
Fig. 5 is a circuit diagram of the resonant converter of embodiment 5 of the present invention.
In the figure: 100. 200, 300, 400, 500-resonant converters; 110-a switch module; 111. 112-a switch; 120-a transformer; 130-an output circuit; 140-a resonant circuit; cr, cr 2-resonance capacitance; co-a voltage-stabilizing capacitor; cs-ampere capacitor; d1, D2-diodes; n1, N2, N3-windings; LLK-leakage inductance; lm-resonant inductance; vin-the input voltage.
The specific implementation mode is as follows:
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.
Example 1:
fig. 1 is a circuit diagram of an embodiment of a resonant converter of the present invention. As shown in fig. 1, the resonant converter 100 includes a switch module 110, a transformer 120, an output circuit 130, a resonant circuit 140, and a safety capacitor Cs. The switch module 110 may be connected between the input voltage Vin and ground. The transformer 120 has a primary winding N1 and two secondary windings N2 and N3. The output circuit 130 is connected between the secondary windings N2 and N3 and the load (i.e., the output voltage Vo). The resonant circuit 140 is coupled between the primary winding N1 and the switch module 110, and includes at least one leakage inductance LLK. The safety capacitor Cs is connected between the leakage inductance LLK and the switch module 110.
Further, the switch module 110 includes a first switch 111 and a second switch 112, the first switch 111 is connected between the input voltage Vin and the second switch 112, and the second switch 112 is connected between the first switch 111 and the ground. The resonant converter 100 can provide an ac voltage to the transformer 120 by switching on and off the first switch 111 and the second switch 112.
Furthermore, the resonant circuit 140 further includes a resonant capacitor Cr and a resonant inductor Lm, wherein the leakage inductance LLK is connected to the safety capacitor Cs and one end of the primary winding N1, the resonant capacitor Cr is connected to the switch module 110 and the other end of the primary winding N1, and the resonant inductor Lm is connected across two ends of the primary winding N1. The resonant circuit 140 generates a resonant effect on the ac voltage provided to the transformer 120 through the resonant capacitor Cr, the resonant inductor Lm, and the leakage inductor LLK, so that there is no voltage difference between the on and off switches of the first switch 111 and the second switch 112.
Still further, the output circuit 130 includes diodes D1 and D2 and a voltage-stabilizing capacitor Co, the secondary winding N2 is connected between the anode of the diode D1 and the secondary winding N3, the secondary winding N3 is connected between the anode of the diode D2 and the secondary winding N2, and the voltage-stabilizing capacitor Co is connected between the common junction of the cathode of the diode D1 and the cathode of the diode D2 and the common junction of the secondary windings N2 and N3.
In the present embodiment, the safety capacitor Cs is connected between the leakage inductance LLK and the ground, and the resonant capacitor Cr is connected between the primary winding N1 and the common point of the first switch 111 and the second switch 112. The safety capacitor Cs can provide an isolation effect on the voltage transmission path where the leakage inductance LLK is located, and the resonant capacitor Cr can provide a similar isolation effect on the voltage transmission path at the other end of the primary winding N1, so that the transformer 120 does not need to bear the function of electrical isolation between the primary winding N1 and the secondary windings N2 and N3, and thus the insulation distance between the primary winding N1 and the secondary windings N2 and N3 can be reduced, and a winding manner and a transformer bobbin conforming to the safety regulations can be omitted, so that the volume of the transformer 120 can be greatly reduced. In a preferred embodiment, the electrical isolation distance between the primary winding N1 and the secondary windings N2 and N3 of the transformer 120 can be reduced to 0.1mm to 8 mm.
Note that in the above embodiment, since the safety capacitor Cs provides electrically isolating insulation, it is necessary to maintain a double or enhanced insulation specification, such as a separation of 8mm, between the two poles of the safety capacitor Cs. Similarly, although the main function of the resonant capacitor Cr is to generate resonance for the ac voltage supplied to the transformer 120, the dual or enhanced insulation specifications between the two poles of the resonant capacitor Cr need to be maintained, so that the voltage transmission path can complete the isolation insulation specification before reaching the primary winding N1.
Example 2:
fig. 2 is a circuit diagram of another embodiment of a resonant converter of the present invention. Note that, in order to avoid confusion, elements in fig. 2 having the same function as those in fig. 1 will be denoted by the same reference numerals. The resonant converter 200 shown in fig. 2 is configured and operates substantially the same as the resonant converter 100 shown in fig. 1, and the only difference is that in the resonant converter 200 shown in fig. 2, the safety capacitor Cs is connected between the leakage inductance LLK and the common point of the first switch 111 and the second switch 112, and the resonant capacitor Cr is connected between the primary winding N1 and the ground. The principles of the resonant converter 200 will be readily apparent to those skilled in the art after reading the above detailed description of the resonant converter 100, and for brevity, will not be described herein again.
Example 3:
fig. 3 is a circuit diagram of yet another embodiment of the resonant converter of the present invention. Note that, in order to avoid confusion, elements in fig. 3 having the same function as those in fig. 1 will be denoted by the same reference numerals. The resonant converter 300 shown in fig. 3 is configured and operates substantially the same as the resonant converter 100 shown in fig. 1, and the only difference is that in the resonant converter 300 shown in fig. 3, the safety capacitor Cs is connected between the leakage inductance LLK and the common node of the first switch 111 and the second switch 112, and the resonant capacitor Cr is connected between the primary winding N1 and the input voltage Vin. The principles of the resonant converter 300 will be readily apparent to those skilled in the art after reading the above detailed description of the resonant converter 100, and for brevity, will not be described herein again.
Example 4:
fig. 4 is a circuit diagram of yet another embodiment of a resonant converter of the present invention. Note that, in order to avoid confusion, elements in fig. 4 having the same function as those in fig. 2 will be denoted by the same symbols. The resonant converter 400 shown in fig. 4 is configured and operates substantially the same as the resonant converter 200 shown in fig. 2, and the only difference is that in the resonant converter 400 shown in fig. 4, the safety capacitor Cs is connected between the leakage inductance LLK and the input voltage Vin, and the resonant capacitor Cr is connected between the primary winding N1 and the common junction of the first switch 111 and the second switch 112. The principles of the resonant converter 400 will be readily apparent to those skilled in the art after reading the above detailed description of the resonant converter 200, and for brevity, will not be described herein again.
Example 5:
fig. 5 is a circuit diagram of yet another embodiment of a resonant converter of the present invention. Note that, in order to avoid confusion, elements in fig. 5 having the same function as those in fig. 2 will be denoted by the same reference numerals. The resonant converter 500 shown in fig. 5 is configured and operated substantially the same as the resonant converter 200 shown in fig. 2, with the only difference that the resonant converter 500 shown in fig. 5 further includes a resonant capacitor Cr2. The resonant capacitor Cr2 is connected between the input voltage Vin and a common point of the resonant capacitor Cr and the primary winding N1. The principles of the resonant converter 500 will be readily apparent to those skilled in the art after reading the above detailed description of the resonant converter 200, and for brevity, will not be described herein again.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (8)

1. A resonant converter, comprising:
a switch module: is connected between the input voltage and the ground;
a transformer: comprises a primary side winding and at least one secondary side winding;
an output circuit: the secondary side winding is connected between the at least one secondary side winding and the load;
a resonant circuit: the switch module is coupled between the primary side winding and the switch module and comprises at least one leakage inductance;
safety capacitor: the resonant circuit further comprises a first resonant capacitor and a resonant inductor, the leakage inductor is connected to one end of the safety regulating capacitor and one end of the primary side winding, the first resonant capacitor is connected to the other end of the switch module and the primary side winding, the resonant inductor is bridged across two ends of the primary side winding, the resonant capacitor is connected between a common joint of the primary side winding and the first switch and the second switch, the safety regulating capacitor provides an isolation effect on a voltage transmission path where the leakage inductor is located, and the resonant capacitor provides an isolation effect on a voltage transmission path at the other end of the primary side winding.
2. A resonant converter according to claim 1, characterized in that: the output circuit comprises a first diode, a second diode and a voltage stabilizing capacitor, at least one secondary side winding comprises a first secondary side winding and a second secondary side winding, the first secondary side winding is connected between the anode of the first diode and the second secondary side winding, the second secondary side winding is connected between the anode of the second diode and the first secondary side winding, and the voltage stabilizing capacitor is connected between the common junction of the cathode of the first diode and the cathode of the second diode and the common junction of the first secondary side winding and the second secondary side winding.
3. A resonant converter according to claim 2, characterized in that: the switch module comprises a first switch and a second switch, wherein the first switch is connected between the input voltage and the second switch, and the second switch is connected between the first switch and the ground.
4. A resonant converter according to claim 3, characterized in that: the safety capacitor is connected between the common junction of the first switch and the second switch and the leakage inductance.
5. A resonant converter according to claim 3, characterized in that: the safety capacitor is connected between the ground and the leakage inductance.
6. A resonant converter according to claim 3, characterized in that: the safety capacitor is connected between the input voltage and the leakage inductance.
7. A resonant converter according to claim 1, characterized in that: the resonant circuit further comprises a second resonant capacitor connected between the other end of the primary winding and the input voltage.
8. A resonant converter according to claim 1, characterized in that: the distance of electrical isolation between the primary side winding and at least one secondary side winding is 0.1 mm-8 mm.
CN201910606156.7A 2019-07-05 2019-07-05 Resonance converter Active CN110149055B (en)

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CN110149055B true CN110149055B (en) 2023-02-07

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Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008172894A (en) * 2007-01-10 2008-07-24 Sony Corp Switching power supply circuit
CN103329420B (en) * 2011-01-26 2015-12-02 株式会社村田制作所 Switching power circuit
US20120281436A1 (en) * 2011-05-05 2012-11-08 Cuks, Llc Isolated dc-to-dc voltage step-up converter
FR3004870B1 (en) * 2013-04-23 2015-05-22 Valeo Equip Electr Moteur METHOD AND DEVICE FOR CONTROLLING A RESONANCE CONTINUOUS CURRENT-CURRENT MULTI-PHASE CONVERTER, AND CORRESPONDING MULTIPHASE CONVERTER
CN104124874B (en) * 2014-07-16 2017-02-15 广州金升阳科技有限公司 Ultrahigh-frequency isolating resonant converter
CN108028605B (en) * 2015-09-18 2020-05-12 株式会社村田制作所 Converter with hold-up operation
US10686387B2 (en) * 2017-05-31 2020-06-16 Murata Manufacturing Co., Ltd. Multi-transformer LLC resonant converter circuit
US11095227B2 (en) * 2017-12-22 2021-08-17 Murata Manufacturing Co., Ltd. Interleaved LLC resonant converter

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