CN114123802B - Secondary side synchronous rectification method of LLC circuit - Google Patents

Secondary side synchronous rectification method of LLC circuit Download PDF

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Publication number
CN114123802B
CN114123802B CN202210083955.2A CN202210083955A CN114123802B CN 114123802 B CN114123802 B CN 114123802B CN 202210083955 A CN202210083955 A CN 202210083955A CN 114123802 B CN114123802 B CN 114123802B
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mosfet
transformer
secondary side
current
circuit
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CN114123802A (en
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朱哲
陈岩
徐瑶
苗甲
杨锡旺
付瑜
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Changzhou Shiwei Electronics Co ltd
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Changzhou Soarwhale Electronic Technology 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
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33592—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/083—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the ignition at the zero crossing of the voltage or the current
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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

Abstract

The invention provides a secondary side synchronous rectification method of an LLC circuit. The method comprises the steps of sampling secondary side current/primary side current of the transformer; carrying out zero-crossing comparison on the sampling current; if the sampled secondary side current of the transformer is larger than 0, acquiring the on and off states of the MOSFET of the primary full-bridge circuit, and switching on and/or switching off the MOSFET of the secondary rectifying circuit of the LLC circuit according to a preset rule; and if the sampled secondary side current of the transformer is not more than 0, switching off an MOSFET of a secondary rectifying circuit of the LLC circuit. In this way, the synchronous rectification method is simple in implementation mode, convenient to control, capable of reducing hardware circuits and overall cost.

Description

Secondary side synchronous rectification method of LLC circuit
Technical Field
The present disclosure relates to the field of power electronics, and in particular, to the technical field of synchronous rectification of secondary sides of LLC circuits.
Background
At present, the switching frequency in the LLC circuit is higher and higher, and the advantages brought by the increase of the switching frequency are as follows: the volume of energy storage devices (inductors, transformers, capacitors and the like) in the circuit is correspondingly reduced. ② the power density of the whole circuit is further increased.
On the occasion that the LLC secondary side current is large, synchronous rectification is used, so that the conduction loss of a secondary side switch tube can be reduced, and the overall efficiency is improved. In the prior art, synchronous rectification is generally realized by a hardware circuit, and besides secondary side current detection, auxiliary hardware circuits such as zero-cross comparison and logic circuits are also needed, so that synchronous rectification driving is controlled, the realization method is complex, and the device cost is increased.
Disclosure of Invention
The disclosure provides a secondary side synchronous rectification method of an LLC circuit.
The LLC circuit comprises a primary, a transformer and a secondary; the primary is a full bridge circuit, including: a DC input source, a first bridge arm switching tube consisting of a first upper MOSFET (Q2A) and a first lower MOSFET (Q2B), a second lower MOSFET (Q3A) and a second upper MOSFET (Q3B) groupThe second bridge arm switching tube is an LLC resonance tank consisting of a resonance capacitor (Cr), a resonance inductor (Lr) and an excitation inductor (Lm); the transformer (T)0) The secondary side of the transformer is provided with a center tap; the secondary stage comprises a third upper MOSFET (Q4A), a third lower MOSFET (Q5A) and an output filter capacitor (C)o) A rectifier circuit is formed; wherein a first upper MOSFET (Q2A) and a first lower MOSFET (Q2B) connected in series are connected in parallel with a second lower MOSFET (Q3A) and a second upper MOSFET (Q3B) connected in series across a first capacitor (C1); the common connection point of the first upper MOSFET (Q2A) and the first lower MOSFET (Q2B) is connected with the first end of the resonance inductor (Lr); the common connection point of the second lower MOSFET (Q3A) and the second upper MOSFET (Q3B) is connected with the first end of the resonance capacitor (Cr); the two ends of the excitation inductor (Lm) are respectively connected with the second end of the resonance inductor (Lr) and the second end of the resonance capacitor (Cr), and the two ends of the excitation inductor (Lm) are connected with the transformer (T)0) Two ends of the primary side; transformer (T)0) The first end of the secondary side is connected with the drain electrode of the third upper MOSFET (Q4A), and the transformer (T)0) The second end of the secondary side is connected with the drain electrode of a third lower MOSFET (Q5A); the source of the third upper MOSFET (Q4A) is connected to the source of the third lower MOSFET (Q5A); output filter capacitor (C)o) Are connected to the source of the third upper MOSFET (Q4A) and the transformer (T), respectively0) The center of the secondary side is tapped.
The invention provides a secondary side synchronous rectification method of an LLC circuit. The method comprises the steps of sampling secondary side current of the transformer; carrying out zero-crossing comparison on the sampling current; if the sampled secondary side current of the transformer is larger than 0, acquiring the on and off states of the MOSFET of the primary full-bridge circuit, and switching on and/or switching off the MOSFET of the secondary rectifying circuit of the LLC circuit according to a preset rule; and if the sampled secondary side current of the transformer is not more than 0, switching off an MOSFET of a secondary rectifying circuit of the LLC circuit.
In the aspect and any possible implementation manner described above, an implementation manner is further provided, where if the sampled secondary side current of the transformer is greater than 0, the working state of the primary side of the LLC circuit is determined; if the sampled secondary side current of the transformer is larger than 0 and Q2A and Q3A are in an on state, setting Q4A to be on and Q5A to be off; if the sampled secondary side current of the transformer is larger than 0 and Q2B and Q3B are in an on state, Q4A is set to be turned off and Q5A is set to be turned on; otherwise, Q4A and Q5A are set to off.
In accordance with the foregoing aspect and any one of the possible implementations, there is further provided an implementation in which the on and off states of the MOSFET are determined by the gate-source voltage thereof, and the MOSFET is turned on if the gate-source voltage thereof reaches the on voltage, and is turned off if the gate-source voltage thereof is the off voltage.
As with the above-described aspects and any possible implementation, there is further provided an implementation in which setting on/off of Q4A, Q5A includes: drive signals are generated, and the drive signals turn on and/or off the Q4A and the Q5A through the drive circuit.
The above-described aspect and any possible implementation further provide an implementation in which zero-crossing comparison is performed on a sampled current, including:
comparing the current amplitude of the sampling current with a preset value close to 0;
if the current amplitude is larger than the preset value, determining that the sampling current is larger than 0;
and if the current amplitude is smaller than the preset value, determining that the sampling current is smaller than 0.
In the disclosure, a simple and conveniently-controlled LLC circuit is provided, the complexity of a hardware circuit is reduced, and meanwhile, synchronous rectification of the LLC secondary side can be quickly achieved through a software form on the basis of the LLC circuit, thereby reducing the overall cost.
It should be understood that the statements herein reciting aspects are not intended to limit the critical or essential features of the embodiments of the present disclosure, nor are they intended to limit the scope of the present disclosure. Other features of the present disclosure will become apparent from the following description.
Drawings
The above and other features, advantages and aspects of various embodiments of the present disclosure will become more apparent by referring to the following detailed description when taken in conjunction with the accompanying drawings. The accompanying drawings are included to provide a further understanding of the present disclosure, and are not intended to limit the disclosure thereto, and the same or similar reference numerals will be used to indicate the same or similar elements, where:
fig. 1 shows a schematic structural diagram of an LLC circuit according to an embodiment of the present disclosure;
fig. 2 shows a flow diagram of a method of secondary side synchronous rectification of an LLC circuit according to an embodiment of the present disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are some, but not all embodiments of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
In addition, the term "and/or" herein is only one kind of association relationship describing an associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
Fig. 1 shows a schematic structural diagram of an LLC circuit according to an embodiment of the disclosure.
The LLC circuit comprises a primary, a transformer and a secondary. Wherein the content of the first and second substances,
the primary is a full bridge circuit, mainly includes: the direct current input source, a first bridge arm switching tube composed of Q2A and Q2B, a second bridge arm switching tube composed of Q3A and Q3B, and an LLC resonance tank composed of a resonance capacitor, a resonance inductor and an excitation inductor.
The secondary side of the transformer is provided with a center tap.
The secondary is a rectifying circuit consisting of Q4A, Q5A and an output filter capacitor.
In some embodiments, the drains of Q2A and Q3B are connected to the positive terminal of an input DC source, and the sources of Q2A and Q3B are connected to the positive terminal of an input DC sourceDrains of Q2B and Q3A are connected, sources of Q2B and Q3A are connected and connected with a negative electrode of an input direct current source, one end of a resonant inductor Lr is connected with the source of Q2A and the drain of Q2B, and the other end of the resonant inductor Lr is connected with one end of an excitation inductor Lm and one end of a transformer T0One end of a resonant capacitor Cr is connected with the source electrode of Q3B and the drain electrode of Q3A, and the other end is connected with the other end of an excitation inductor Lm and a transformer T0The other end of the primary side of the transformer is connected with the other end of the primary side of the transformer.
In some embodiments, transformer T0One end of the secondary side of the transformer is connected with the drain electrode of the Q4A and the transformer T0The center tap on the secondary side of the transformer is connected with one end of an output filter capacitor Co; transformer T0The other end of the secondary side of the transistor is connected with the drain electrode of Q5A; the source of Q4A is connected to the source of Q5A and to the other end of the output filter capacitor Co.
In some embodiments, Q2A, Q2B, Q3A, Q3B, Q4A, Q5A are MOSFETs.
In some embodiments, the working state of the secondary rectification circuit is controlled by a driving control chip according to a zero-crossing comparison result of the secondary current of the transformer and the on-off state of the MOSFET of the primary full-bridge circuit, and a driving signal is generated according to a preset rule and is used for controlling the on-off of the MOSFET of the secondary rectification circuit of the LLC circuit through the driving circuit.
Fig. 2 shows a flow diagram of a method 200 for secondary side synchronous rectification of an LLC circuit according to an embodiment of the present disclosure.
At block 210, the transformer secondary current is sampled;
in some embodiments, the transformer secondary current i is sampledtran_sec。
In some embodiments, the sampling is performed by using a direct current hall sensor, or by using a sampling resistor + for amplification, or by using a transformer for direct input to an a/d (dsp).
At block 220, a zero-crossing comparison is performed on the sampled currents;
in some embodiments, the zero-crossing comparing the sampled current comprises: comparing the current amplitude of the sampling current with a preset value close to 0, if the current amplitude is larger than the preset value, determining that the sampling current is larger than 0, and if the current amplitude is larger than the preset valueAnd if the current amplitude is smaller than the preset value, determining that the sampling current is smaller than 0. Specifically, the secondary current zero-crossing comparison may be non-zeroi tran_sec|>I min_comp，I min_compA minimum value close to 0.
At block 230, if the sampled secondary side current of the transformer is greater than 0, acquiring the on and off states of the MOSFET of the primary full-bridge circuit, and turning on and/or off the MOSFET of the secondary rectification circuit of the LLC circuit according to a preset rule;
in some embodiments, if the sampled secondary side current of the transformer is greater than 0, the working state of the primary side of the LLC circuit is determined,
if the sampled secondary side current of the transformer is larger than 0 and Q2A and Q3A are in an on state, Q4A is set to be on and Q5A is set to be off.
If the sampled secondary side current of the transformer is larger than 0 and Q2B and Q3B are in an on state, Q4A is set to be turned off and Q5A is set to be turned on.
Otherwise, Q4A and Q5A are set to off.
At block 240, a MOSFET of a secondary rectifier circuit of the LLC circuit is turned off if the sampled transformer secondary current is not greater than 0.
In some embodiments, Q4A, Q5A are set to off if the sampled transformer secondary current is equal to 0.
In some embodiments, the on and off states of a MOSFET are determined by its gate-source voltage, which is on if it reaches an on voltage, and off if it is an off voltage.
In some embodiments, the above operation is performed by the driving control chip generating a driving signal according to a preset rule according to the zero-crossing comparison result and the on and off states of the MOSFET of the primary full-bridge circuit, and the driving signal turns on and/or off the MOSFET of the secondary rectification circuit of the LLC circuit via the driving circuit.
According to the embodiment of the disclosure, the following technical effects are achieved:
the invention samples the secondary side current of the transformer, sends the secondary side current into a Comp port of a DSP micro-control chip, and obtains the turn-on and turn-off time of the secondary side drive through zero-crossing comparison of software; and then the logic of the primary side drive EPWM is controlled by combining the DSP, a secondary side drive EPWM is generated, and the secondary side drive EPWM passes through the amplifying circuit to generate the drive required by the switching tube. The synchronous rectification method is simple in implementation mode, convenient to control, capable of reducing hardware circuits and overall cost.
It is noted that while for simplicity of explanation, the foregoing method embodiments have been described as a series of acts or combination of acts, it will be appreciated by those skilled in the art that the present disclosure is not limited by the order of acts, as some steps may, in accordance with the present disclosure, occur in other orders and concurrently. Further, those skilled in the art should also appreciate that the embodiments described in the specification are exemplary embodiments and that acts and modules referred to are not necessarily required by the disclosure.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present disclosure may be executed in parallel, sequentially, or in different orders, as long as the desired results of the technical solutions disclosed in the present disclosure can be achieved, and the present disclosure is not limited herein.
The above detailed description should not be construed as limiting the scope of the disclosure. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present disclosure should be included in the scope of protection of the present disclosure.

Claims (4)

1. A secondary side synchronous rectification method of an LLC circuit, wherein the LLC circuit comprises a primary side, a transformer and a secondary side; the primary is a full bridge circuit, including: the direct current input source comprises a first bridge arm switching tube consisting of a first upper MOSFET (Q2A) and a first lower MOSFET (Q2B), a second bridge arm switching tube consisting of a second lower MOSFET (Q3A) and a second upper MOSFET (Q3B), and a resonant capacitor (Cr), a resonant inductor (Lr) and a capacitor (L),An LLC resonant tank consisting of an excitation inductor (Lm); the transformer (T)0) The secondary side of the transformer is provided with a center tap; the secondary stage comprises a third upper MOSFET (Q4A), a third lower MOSFET (Q5A) and an output filter capacitor (C)o) A rectifier circuit is formed; wherein a first upper MOSFET (Q2A) and a first lower MOSFET (Q2B) connected in series are connected in parallel with a second lower MOSFET (Q3A) and a second upper MOSFET (Q3B) connected in series across a first capacitor (C1); the common connection point of the first upper MOSFET (Q2A) and the first lower MOSFET (Q2B) is connected with the first end of the resonance inductor (Lr); the common connection point of the second lower MOSFET (Q3A) and the second upper MOSFET (Q3B) is connected with the first end of the resonance capacitor (Cr); the two ends of the excitation inductor (Lm) are respectively connected with the second end of the resonance inductor (Lr) and the second end of the resonance capacitor (Cr), and the two ends of the excitation inductor (Lm) are connected with the transformer (T)0) Two ends of the primary side; transformer (T)0) The first end of the secondary side is connected with the drain electrode of the third upper MOSFET (Q4A), and the transformer (T)0) The second end of the secondary side is connected with the drain electrode of a third lower MOSFET (Q5A); the source of the third upper MOSFET (Q4A) is connected to the source of the third lower MOSFET (Q5A); output filter capacitor (C)o) Are connected to the source of the third upper MOSFET (Q4A) and the transformer (T), respectively0) A center tap of the secondary side;
the secondary side synchronous rectification method of the LLC circuit comprises the following steps:
sampling the secondary side current of the transformer;
carrying out zero-crossing comparison on the sampling current; if the sampled secondary side current of the transformer is larger than 0, the working state of the primary side of the LLC circuit is further judged:
when the primary operating state of the LLC circuit is state one: namely, the first upper MOSFET (Q2A) and the second lower MOSFET (Q3A) are in an on state, the third upper MOSFET (Q4A) is set to be on, and the third lower MOSFET (Q5A) is set to be off;
when the primary working state of the LLC circuit is state two: namely, the first lower MOSFET (Q2B) and the second upper MOSFET (Q3B) are in an on state, the third upper MOSFET (Q4A) is set to be turned off, and the third lower MOSFET (Q5A) is set to be turned on;
and when the sampled secondary side current of the transformer is greater than 0 and the primary working state of the LLC circuit does not belong to the first state and the second state, or when the sampled secondary side current of the transformer is not greater than 0, turning off a third upper MOSFET (Q4A) and a third lower MOSFET (Q5A) of a secondary rectifying circuit of the LLC circuit.
2. The method of claim 1, wherein,
the on and off states of the MOSFET are determined by the gate-source voltage, if the gate-source voltage reaches the on voltage, the MOSFET is in the on state, and if the gate-source voltage is the off voltage, the MOSFET is in the off state.
3. The method of claim 2, wherein setting the third upper MOSFET (Q4A), the third lower MOSFET (Q5A) on/off comprises:
a drive signal is generated, and the drive signal switches on and/or off the third upper MOSFET (Q4A) and the third lower MOSFET (Q5A) through a drive circuit.
4. The method of claim 1, wherein the zero-crossing comparing the sampled current comprises:
comparing the current amplitude of the sampling current with a preset value close to 0;
if the current amplitude is larger than the preset value, determining that the sampling current is larger than 0;
and if the current amplitude is smaller than the preset value, determining that the sampling current is smaller than 0.
CN202210083955.2A 2022-01-25 2022-01-25 Secondary side synchronous rectification method of LLC circuit Active CN114123802B (en)

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CN101471606A (en) * 2007-12-26 2009-07-01 深圳迈瑞生物医疗电子股份有限公司 LLC resonant transformation device
CN101577494B (en) * 2008-05-09 2013-01-30 台达电子工业股份有限公司 Synchronous rectification circuit with intermittent mode controller and control method thereof
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Address after: 213300 building 19, No. 618, wharf West Street, Kunlun Street, Liyang City, Changzhou City, Jiangsu Province

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