CN111049387B - TLC II type resonant circuit and power converter applied by same - Google Patents
TLC II type resonant circuit and power converter applied by same Download PDFInfo
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- CN111049387B CN111049387B CN201911205569.0A CN201911205569A CN111049387B CN 111049387 B CN111049387 B CN 111049387B CN 201911205569 A CN201911205569 A CN 201911205569A CN 111049387 B CN111049387 B CN 111049387B
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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
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H5/00—One-port networks comprising only passive electrical elements as network components
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The embodiment of the invention provides a TLC II type resonant circuit and a power converter applied by the same, wherein the TLC II type resonant circuit comprises: the first winding, the second winding and the resonance component are arranged in parallel; the second end of the first winding is connected with the first end of the second winding through a middle tap; the first winding and the second winding are coupled in series in the same direction; the first end of the first winding is connected with a first electric connection point; the second end of the second winding is connected with a second electrical connection point; one end of the resonance component is connected with the middle tap, and the other end of the resonance component is connected with the first electrical connection point or the second electrical connection point, so that when the resonance component is applied to a power converter, the conversion efficiency of the converter can be improved; because the current in the power loop is sine wave, the EMI and the switching noise are reduced, the EMI filter circuit which is additionally arranged due to the EMI problem is simplified, and the comprehensive cost performance of the converter is indirectly increased.
Description
The present application claims priority from chinese patent application entitled "a flyback self-resetting LC resonant ZCS power converter" filed by the chinese patent office on 18/11/2019 with application number CN201911129237.9, the entire contents of which are incorporated herein by reference.
Technical Field
The embodiment of the invention relates to the technical field of power electronics, in particular to a TLC II type resonant circuit and a power converter applied by the same.
Background
In the conventional flyback converter, a currently common QR (quasi-resonance) technology is adopted, and in the full-voltage and load change range, because a switching tube can only be conducted at the valley bottom when a primary inductor of a transformer and an output capacitor of a power switching tube resonate, only part of switching loss can be reduced. In addition, the current in the power loop is triangular wave, and has high current change rate (dI/dt), so that EMI (electromagnetic interference) and switching noise level are high.
Therefore, how to provide a resonant converter scheme with low production cost and capable of improving efficiency and reducing EMI interference and switching noise in application is a technical problem to be solved urgently by those skilled in the art
Disclosure of Invention
Therefore, the embodiment of the invention provides a TLC II type resonant circuit and a power converter applied by the TLC II type resonant circuit, which have low production cost and can improve the efficiency and reduce EMI interference and switching noise in application.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
in a first aspect, an embodiment of the present invention provides a TLC type ii resonant circuit, including: the first winding, the second winding and the resonance component are arranged in parallel;
the second end of the first winding is connected with the first end of the second winding through a middle tap; the first winding and the second winding are coupled in series in the same direction;
the first end of the first winding is connected with a first resonance connection point; a second end of the second winding is connected with a second resonance connection point;
one end of the resonant assembly is connected with the middle tap, and the other end of the resonant assembly is connected with the first electrical connection point or the second electrical connection point.
Preferably, the resonance assembly comprises: a resonance inductor and a resonance capacitor connected in series.
Preferably, a first end of the resonant inductor is connected with a first end of the resonant capacitor;
the second end of the resonance inductor is connected with the middle tap;
a second end of the resonant capacitor is connected to the second resonant connection point.
Preferably, a first end of the resonant inductor is connected with a first end of the resonant capacitor;
the second end of the resonance inductor is connected with the middle tap;
a second terminal of the resonant capacitor is connected to the first resonant connection point.
Preferably, a first end of the resonant inductor is connected with a first end of the resonant capacitor;
the second end of the resonance capacitor is connected with the middle tap;
the second end of the resonant inductor is connected to the first resonant connection point.
Preferably, a first end of the resonant inductor is connected with a first end of the resonant capacitor;
the second end of the resonance capacitor is connected with the middle tap;
a second end of the resonant inductor is connected to the second resonant connection point.
In a second aspect, an embodiment of the present invention provides a TLC ii type resonant circuit applied to a flyback self-reset LC resonant ZCS power converter, including: a power input terminal, a transformer winding, a first capacitor, a second capacitor, a power switch tube, an output rectifier diode, a power output terminal, a TLC II type resonance circuit as claimed in any one of claims 1 to 6;
the transformer winding induces voltage by utilizing a first winding and a second winding of the TLC II type resonant circuit;
the power input end, the first end of the first capacitor and the first resonant connection point of the TLC II type resonant circuit are connected to a first electrical connection point;
the second end of the first capacitor is grounded;
a second resonance connecting point of the TLC II type resonance circuit and the drain electrode of the power switch tube are connected to a second electric connecting point;
the source electrode of the power switch tube is grounded;
the power switch tube comprises a triode, an MOS tube, a gallium nitride MOS and an IGBT;
the first end of the transformer winding is connected with the first end of the second capacitor through an output rectifier diode;
the second end of the second capacitor is grounded;
the second end of the transformer winding is grounded;
in a third aspect, an embodiment of the present invention provides a TLC ii type resonant circuit applied to a boost power converter, including: a power input terminal, a first capacitor, a second capacitor, a power switch tube, a rectifier diode, a TLC type II resonant circuit as claimed in any one of claims 1 to 6;
one end of the first capacitor and the power input end are connected to a first connecting point; the other end of the first capacitor is grounded;
a first resonant connection point of the TLC II type resonant circuit is connected with the first connection point;
a second electrical connection point of the TLC II type resonant circuit and the drain electrode of the power switch tube are connected to a second connection point;
the source electrode of the power switch tube is grounded; the controlled end of the switching tube is connected to the pulse generator;
the power switch tube comprises a triode, an MOS tube, a gallium nitride MOS and an IGBT;
the anode of the rectifier diode is connected with the second connection point;
and the cathode of the rectifier diode and the first end of the second capacitor are connected with the voltage output end.
In a fourth aspect, an embodiment of the present invention provides a TLC ii type resonant circuit applied to a buck power converter, including: a power input terminal, a first capacitor, a second capacitor, a power switch tube, a rectifier diode, a TLC type II resonant circuit as claimed in any one of claims 1 to 6;
the power supply input end, the first end of the first capacitor and the drain electrode of the power switch tube are connected to a first connecting point;
the cathode of the rectifier diode, the source electrode of the power switch tube and the first resonant connection point of the TLC II type resonant circuit are connected to a second connection point; the controlled end of the switching tube is connected to the pulse generator;
the power switch tube comprises a triode, an MOS tube, a gallium nitride MOS and an IGBT;
a second resonance connecting point of the TLC II type resonance circuit is connected with a first end of a second capacitor to output a voltage end;
and the second end of the second capacitor is grounded.
In a fifth aspect, an embodiment of the present invention provides a TLC ii type resonant circuit applied to a buck-boost power converter, including: a power input terminal, a first capacitor, a second capacitor, a power switch tube, a rectifier diode, a TLC type II resonant circuit as claimed in any one of claims 1 to 6;
the power input end is connected with the first end of the first capacitor and the drain electrode of the power switch tube to a first connecting point;
the source electrode of the switching tube, a first resonance connection point of the TLC II type resonance circuit and the cathode of the rectifier diode are connected to a second connection point; the controlled end of the power switch tube is connected with the pulse generator;
the power switch tube comprises a triode, an MOS tube, a gallium nitride MOS and an IGBT;
a second resonant connection point of the TLC II type resonant circuit is grounded; the second end of the first capacitor is grounded;
the anode of the rectifier diode and the second end of the second capacitor are connected with a voltage output end;
and the second end of the second capacitor is grounded.
The embodiment of the invention provides a TLC II type resonant circuit, which comprises: the first winding, the second winding and the resonance component are arranged in parallel; the second end of the first winding is connected with the first end of the second winding through a middle tap; the first winding and the second winding are coupled in series in the same direction; the first end of the first winding is connected with a first resonance connection point; a second end of the second winding is connected with a second resonance connection point; one end of the resonance component is connected with the middle tap, and the other end of the resonance component is connected with the first electrical connection point or the second resonance connection point, so that when the resonance component is applied to a power converter, the conversion efficiency of the converter can be improved; because the current in the power loop is sine wave, the EMI and the switching noise are reduced, the EMI filter circuit which is additionally arranged due to the EMI problem is simplified, and the comprehensive cost performance of the flyback converter is indirectly increased.
The TLC ii type resonant circuit and the power converter applied thereto provided by the embodiments of the present invention have the same beneficial effects, and are not described herein again.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
Fig. 1 is a schematic circuit diagram of a TLC type ii resonant circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a first variant of a TLC type II resonant circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a second variant of a TLC type II resonant circuit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a third variant of a TLC type II resonant circuit according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a flyback self-resetting LC resonant ZCS power converter according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a first variant connection circuit of a flyback self-resetting LC resonant ZCS power converter according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a second variant connection circuit of a flyback self-resetting LC resonant ZCS power converter according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a third variant connection circuit of a flyback self-resetting LC resonant ZCS power converter according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a DC260V input simulation of a flyback self-resetting LC resonant ZCS power converter according to an embodiment of the present invention;
FIG. 10 is a graph of a simulation waveform for the DC260V input of FIG. 9;
fig. 11 is a schematic diagram of a DC370V input simulation of a flyback self-resetting LC resonant ZCS power converter according to an embodiment of the present invention;
FIG. 12 is a graph of a simulation waveform for the DC370V input of FIG. 11;
fig. 13 is a schematic circuit diagram of a boost power converter according to an embodiment of the invention;
FIG. 14 is a schematic circuit diagram of a buck power converter according to an embodiment of the present invention;
fig. 15 is a circuit diagram of a buck-boost power converter according to an embodiment of the invention;
fig. 16 is a schematic diagram of a simulation of a boost power converter according to an embodiment of the present invention;
fig. 17 is a simulated waveform diagram of the boost power converter according to the embodiment of the invention.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. 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.
Referring to fig. 1, fig. 2, fig. 3, and fig. 4, fig. 1 is a circuit schematic diagram of a TLC ii type resonant circuit according to an embodiment of the present invention; FIG. 2 is a schematic diagram of a first variant of a TLC type II resonant circuit according to an embodiment of the present invention; FIG. 3 is a schematic diagram of a second variant of a TLC type II resonant circuit according to an embodiment of the present invention; fig. 4 is a schematic diagram of a third variant of a TLC type ii resonant circuit according to an embodiment of the present invention.
In an embodiment of the present invention, a TLC type ii resonant circuit includes:
a first winding 141, a second winding 142, a resonant assembly 130;
a second end of the first winding 141 and a first end of the second winding 142 are connected through a center tap 101; the first winding 141 and the second winding 142 are coupled in series in the same direction;
a first end of the first winding 141 is connected to the first resonance connection point 102; a second end of the second winding 142 is connected to a second resonant connection point 103;
one end of the resonant element 130 is connected to the center tap 101, and the other end of the resonant element 130 is connected to the first electrical connection point 102 or the second resonant connection point 103.
In particular, in an implementation, the resonant component 130 may be configured as a resonant inductor 131 and a resonant capacitor 132 connected in series.
Specifically, as shown in fig. 1, in this embodiment, the resonant component 130 includes a resonant inductor 131 and a resonant capacitor 132, which are connected in series, and a first end of the resonant inductor 131 is connected to a first end of the resonant capacitor 132; a second end of the resonant inductor 131 is connected to the center tap 101; a second terminal of the resonant capacitor 132 is connected to the second resonant connection point 103.
In a further embodiment of the present invention, as shown in fig. 2, the connection of the resonant assembly 130 may be modified, specifically, the resonant assembly 130 includes a resonant inductor 131 and a resonant capacitor 132, which are connected in series, and a first end of the resonant inductor 131 is connected to a first end of the resonant capacitor 132; a second end of the resonant inductor 131 is connected to the center tap 101; a second terminal of the resonant capacitor 132 is connected to the first resonant connection point 102.
In a further embodiment of the present invention, as shown in fig. 3, the connection of the resonant assembly 130 may be modified, specifically, the resonant assembly 130 includes a resonant inductor 131 and a resonant capacitor 132, which are connected in series, and preferably, a first end of the resonant inductor 131 is connected to a first end of the resonant capacitor 132; a second end of the resonant capacitor 132 is connected to the center tap 101; a second terminal of the resonant inductor 131 is connected to the first resonant connection point 102.
In yet another embodiment of the present invention, as shown in fig. 4, the connection of the resonant assembly 130 may be modified, specifically, the resonant assembly 130 includes a resonant inductor 131 and a resonant capacitor 132, which are connected in series, and a first end of the resonant inductor 131 is connected to a first end of the resonant capacitor 132; a second end of the resonant capacitor 132 is connected to the center tap 101; a second end of the resonant inductor 131 is connected to the second resonant connection point 103.
Referring to fig. 5, fig. 6, fig. 7, and fig. 8, fig. 5 is a schematic circuit diagram of a flyback self-resetting LC resonant ZCS power converter according to an embodiment of the present invention; fig. 6 is a schematic diagram of a first variant connection circuit of a flyback self-resetting LC resonant ZCS power converter according to an embodiment of the present invention; fig. 7 is a schematic diagram of a second variant connection circuit of a flyback self-resetting LC resonant ZCS power converter according to an embodiment of the present invention; fig. 8 is a schematic diagram of a third variant connection circuit of a flyback self-resetting LC resonant ZCS power converter according to an embodiment of the present invention.
In a specific embodiment of the present invention, an embodiment of the present invention provides a flyback self-resetting LC resonant ZCS power converter, including:
a power input end 110, a first capacitor 120, a resonance component 130, a transformer 140, a power switch tube 150, an output rectifier diode 160, a second capacitor 170, and a power output end 180;
the transformer 140 includes: a first winding 141, a second winding 142, and a third winding 143; a second end of the first winding 141 and a first end of the second winding 142 are connected through a center tap 101; the first winding 141 and the second winding 142 are coupled in series in the same direction; the third winding 142 induces a voltage with the first winding 141 and the second winding 142;
the power input terminal 110 and the first end of the first winding 141 are connected to the first electrical connection point 102; the second end of the second winding 142 and the drain of the power switch tube 150 are connected to the second electrical connection point 103, and the source of the power switch tube 150 is grounded; a first end of the third winding 142 is connected to the power output end 180 through the output rectifying diode 160, and a second end of the third winding 142 is grounded;
one end of the resonant element 130 is connected to the center tap 101, and the other end of the resonant element 130 is connected to the first electrical connection point 102 or the second electrical connection point 103.
In particular, in an implementation, the resonant component 130 may be configured as a resonant inductor 131 and a resonant capacitor 132 connected in series.
Specifically, as shown in fig. 5, in this embodiment, the resonant component 130 includes a resonant inductor 131 and a resonant capacitor 132, which are connected in series, and a first end of the resonant inductor 131 is connected to a first end of the resonant capacitor 132; a second end of the resonant inductor 131 is connected to the center tap 101; a second end of the resonant capacitor 132 is connected to the second electrical connection point 103.
In yet another embodiment of the present invention, as shown in fig. 6, the connection method of the resonant assembly 130 may be modified, specifically, the resonant assembly 130 includes a resonant inductor 131 and a resonant capacitor 132, which are connected in series, and a first end of the resonant inductor 131 is connected to a first end of the resonant capacitor 132; a second end of the resonant inductor 131 is connected to the center tap 101; a second end of the resonant capacitor 132 is connected to the first electrical connection point 102.
In a further embodiment of the present invention, as shown in fig. 7, the connection of the resonant assembly 130 may be modified, specifically, the resonant assembly 130 includes a resonant inductor 131 and a resonant capacitor 132, which are connected in series, and preferably, a first end of the resonant inductor 131 is connected to a first end of the resonant capacitor 132; a second end of the resonant capacitor 132 is connected to the center tap 101; the second end of the resonant inductor 131 is connected to the first electrical connection point 102.
In yet another embodiment of the present invention, as shown in fig. 8, the connection method of the resonant assembly 130 may be modified, specifically, the resonant assembly 130 includes a resonant inductor 131 and a resonant capacitor 132, which are connected in series, and a first end of the resonant inductor 131 is connected to a first end of the resonant capacitor 132; a second end of the resonant capacitor 132 is connected to the center tap 101; the second end of the resonant inductor 131 is connected to the second electrical connection point 103.
Of course, in order to stabilize the input voltage, an input capacitor 120 may be connected in parallel to the power input terminal 110, that is, the flyback self-resetting LC resonant ZCS power converter may further include the input capacitor 120; one end of the input capacitor 120 is connected to the power input terminal 110; a second terminal of the input capacitor 120 is connected to ground. In order to stabilize the output voltage, an output capacitor 170 may be further disposed at the power output terminal 180; one end of the output capacitor 170 is connected to the power output terminal 180; a second terminal of the input capacitor 120 is connected to ground.
On the basis of the above embodiment, in this embodiment, the power switch tube 150 may be specifically configured as a power switch tube 150 such as a triode, an MOS tube, a gallium nitride MOS, etc., and the controlled end of the power switch tube 150 is connected to the output end of the pulse signal controller; the power switch tube 150 performs switching of the main circuit under the control of the pulse signal controller.
The flyback self-resetting LC resonance ZCS power converter formed by the connection can obviously optimize the working state of the traditional flyback converter, so that a power switch tube works on a ZCS switch, and the conversion efficiency of the converter is improved; because the current in the power loop is sine wave, the EMI and the switching noise are reduced, the EMI filter circuit which is additionally arranged due to the EMI problem is simplified, and the comprehensive cost performance of the flyback converter is indirectly increased.
Please refer to fig. 9, fig. 10, fig. 11, fig. 12; fig. 9 is a schematic diagram of a DC260V input simulation of a flyback self-resetting LC resonant ZCS power converter according to an embodiment of the present invention; FIG. 10 is a graph of a simulation waveform for the DC260V input of FIG. 9; fig. 11 is a schematic diagram of a DC370V input simulation of a flyback self-resetting LC resonant ZCS power converter according to an embodiment of the present invention; fig. 12 is a graph of a simulation waveform for the DC370V input of fig. 11.
In practice, the flyback self-resetting LC resonant ZCS power converter provided in the embodiment of the present invention, specifically, the power converter (see the simulation circuit diagram 9, in this embodiment, the input of DC260V, the output of DC26V, and the DC-DC power converter of 67.6W) includes: the energy storage and resonance network consists of a transformer T1 (the turn ratio is 20: 20: 4, LP 1: 240uH, Lk:3uH), L1 and C2, wherein L1 is a 65uH inductor, and C2 is a 6.8nF 1kV metal film capacitor. The main circuit of the flyback self-reset LC resonance ZCS power supply converter consists of C5, V2, S1, D2, C4, D3A, C1, R2 and the energy storage and resonance network. Wherein C5 is 100uF electrolytic capacitor, V2 is pulse signal generator, and is set to 120kHZ and 40% duty ratio. S1 is a power switch (which can contain a triode, a MOS tube, a gallium nitride MOS, etc.), D2 and C4 are a body diode and a parasitic capacitor in the simulation S1; D3A is a model 20H200CT schottky diode; c1 is an electrolytic capacitor of 470 uF; r2 is a 10 ohm load resistance. The RCD clamping circuit comprises R6, D1, C4 and R4, wherein R6 is a 200 ohm resistor, D1 is an ultrafast recovery diode of UF4007, C4 is a ceramic chip capacitor of 2200pF, and R4 is a 200K resistor. The RC absorption circuit comprises C3 and R1, wherein C3 is a 470pF ceramic chip capacitor, and R1 is a 33 ohm resistor. V3 is an adjustable DC source, set to DC260V in this embodiment.
FIG. 10 is a simulation waveform of the simulation circuit of FIG. 9, wherein the channel CH1 is a switch waveform across the switch S1; the channel CH2 is a switching current waveform of the primary side of the transformer; channel CH3 is the output rectified current waveform; the channel CH4 is the output signal of V2. As can be seen from the above simulation waveforms: the current waveform of the switch on the primary side or the current waveform of the output rectification is changed in a sine law. And the power switch tube S1 is turned off when the sine current wave is close to zero, so as to realize ZCS zero turn-off. And at a particular DC260V input, full load (10 ohm load resistance) condition, zero voltage turn-on is achieved, at which condition the converter is most efficient. According to the EMI and switching noise generation principle, the following characteristics are obtained: because the switching current waveform and the output rectification waveform are changed in a sine rule, the EMI interference and the switching noise level are effectively reduced.
In addition, the flyback self-resetting LC resonance ZCS power supply converter can easily realize closed-loop control, and only needs to set the driving signal of the power switch tube to be fixed on-time (equal to the resonance frequency of a resonance network) and modulate the off-time through an error amplification signal. The power input range may also be wider than the ac range, with the lowest input voltage DC260V and the highest input voltage of 370V in this embodiment (see the simulation schematic and simulation waveforms of fig. 11 and 12 for details).
Referring to fig. 13, fig. 14, and fig. 15, fig. 13 is a circuit schematic diagram of a boost power converter according to an embodiment of the invention; FIG. 14 is a schematic circuit diagram of a buck power converter according to an embodiment of the present invention; fig. 15 is a circuit diagram of a buck-boost power converter according to an embodiment of the invention.
As shown in fig. 13, an embodiment of the present invention provides a boost power converter, including: a power input terminal 201, a first capacitor 202, a power switch 203, a rectifier diode 204, the TLC type ii resonant circuit 100 as described in the first aspect; one end of the first capacitor 202 and the power input end 201 are connected to a first connection point 205; the other end of the first capacitor 202 is grounded; a first resonant connection point of the TLC type ii resonant circuit is connected to the first connection point 205; the second resonant connection point of the TLC II type resonant circuit and the drain electrode of the switching tube 203 are connected to a second connection point 206; the source of the switch tube 203 is grounded; the controlled end of the switch tube 203 is connected to the pulse generator; the anode of the rectifier diode 204 is connected to the second connection point 206; the cathode of the rectifier diode 204 is a voltage output terminal 207.
Further, in order to stabilize the output voltage of the voltage output terminal 207, one end of a second capacitor 208 may be connected to the voltage output terminal 207; the other end of the second capacitor is grounded.
As shown in fig. 14, an embodiment of the present invention provides a buck power converter, including: a power input terminal 301, a first capacitor 302, a switching tube 303, a rectifier diode 304, the TLC type ii resonant circuit 100 as described in the first aspect; the power input terminal 301, the first end of the first capacitor 302, and the drain of the switching tube 303 are connected to a first connection point 306; the cathode of the rectifier diode 304, the source of the switching tube 303 and the first resonant connection point of the TLC ii type resonant circuit are connected to a second connection point 307; the controlled end of the switching tube 303 is connected to the pulse generator; the second resonant junction of the TLC type ii resonant circuit is the output voltage terminal 305.
Of course, a second capacitor 308 for stabilizing the output voltage may be connected to the output voltage terminal 305, so that a stable voltage can be output when the load 309 is connected.
As shown in fig. 15, an embodiment of the present invention provides a buck-boost power converter, including: a power input 401, a first capacitor 402, a switching tube 403, a rectifier diode 404, the TLC type ii resonant circuit 100 as described in the first aspect; the voltage input terminal 401, the first end of the first capacitor 402, and the drain of the switch tube 403 are connected to a first connection point 406; the source of the switching tube 403, the first resonant connection point of the TLC type ii resonant circuit, and the cathode of the rectifier diode 404 are connected to a second connection point 407; the controlled end of the switch tube 403 is connected to the pulse generator; a second electrical connection point of the TLC II type resonant circuit is grounded; a second terminal of the first capacitor 402 is grounded; the anode of the rectifier diode 404 is the voltage output terminal 408.
Further, a second capacitor 409 may be connected in parallel at the voltage output terminal 408; the second capacitor is used for stabilizing voltage; the voltage output terminal is used for connecting a load 410, so that the stability of the output voltage of the whole voltage converter is increased.
Referring to fig. 16 and 17, fig. 16 is a schematic diagram of a simulation of a boost power converter according to an embodiment of the present invention; fig. 17 is a simulated waveform diagram of the boost power converter according to the embodiment of the invention.
The boost power converter, as shown in the simulation circuit diagram 16, includes: a transformer composed of T1, C2 and L1, an inductance and capacitance (TLC) resonance circuit part (replacing an energy storage inductance in a traditional BOOST circuit), and a BOOST main body circuit composed of V1, C4, S1, D2, V2, D3, C1, R2, R1 and C3. In this embodiment (as shown in fig. 6), V1 is an ideal dc source of 6.4V, C4 is an electrolytic capacitor 470uF, V2 is a clock signal source of 100kHZ with a duty cycle of 46%, and S1 is an internal resistance; an ideal switch of 4 milliohms, D2 is a parasitic diode in the analog S1. T1 is turn ratio 10: 10 inductors of 10uH, L1 resonance inductance of 1.65uH, and C2 resonance capacitance of 360 nF. D3 is a 10A, 100V Schottky diode, C3 is 470pF absorption capacitor, R1 is 10 ohm absorption resistor, C1 is 470uF output filter capacitor, and R2 is 12 ohm load resistor.
Fig. 17 shows simulation results of this embodiment, where the 3-channel is the S1 driving waveform (V2 clock signal output), the 2-channel is the S1 switching waveform, and the 4-channel is the T1 charging/discharging current waveform. As can be seen from the simulation waveforms of fig. 9: the switching tube S1 is switched when the current is zero, the ZCS switch is realized, the switching loss is reduced, and therefore the conversion efficiency of the converter can be improved. The rectifier diode D3 is switched on and off when the current is zero, the current of the switching loop and the current of the output loop are changed in a sine rule, and the EMI and the switching noise level are greatly reduced according to the EMI generation principle.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. A TLC type ii resonant circuit, comprising: the first winding, the second winding and the resonance component are arranged in parallel;
the second end of the first winding is connected with the first end of the second winding through a middle tap; the first winding and the second winding are coupled in series in the same direction;
the first end of the first winding is connected with a first resonance connection point; a second end of the second winding is connected with a second resonance connection point;
one end of the resonance component is connected with the middle tap, and the other end of the resonance component is connected with the first resonance connection point or the second resonance connection point.
2. The TLC type ii resonant circuit of claim 1, wherein the resonant assembly comprises: a resonance inductor and a resonance capacitor connected in series.
3. The TLC type ii resonant circuit of claim 2, wherein a first terminal of the resonant inductor is connected to a first terminal of the resonant capacitor;
the second end of the resonance inductor is connected with the middle tap;
a second end of the resonant capacitor is connected to the second resonant connection point.
4. The TLC type II resonator circuit of claim 2,
the first end of the resonance inductor is connected with the first end of the resonance capacitor;
the second end of the resonance inductor is connected with the middle tap;
a second terminal of the resonant capacitor is connected to the first resonant connection point.
5. The TLC type II resonator circuit of claim 2,
the first end of the resonance inductor is connected with the first end of the resonance capacitor;
the second end of the resonance capacitor is connected with the middle tap;
the second end of the resonant inductor is connected to the first resonant connection point.
6. The TLC type II resonator circuit of claim 2,
the first end of the resonance inductor is connected with the first end of the resonance capacitor;
the second end of the resonance capacitor is connected with the middle tap;
a second end of the resonant inductor is connected to the second resonant connection point.
7. A power converter, comprising: a power input terminal, a transformer winding, a first capacitor, a second capacitor, a power switch tube, an output rectifier diode, a power output terminal, a TLC II type resonance circuit as claimed in any one of claims 1 to 6;
the transformer winding uses a first winding and a second winding of the TLC II type resonant circuit as a primary winding induced voltage;
the power input end, the first end of the first capacitor and the first resonant connection point of the TLC II type resonant circuit are connected to a first electrical connection point;
the second end of the first capacitor is grounded;
a second resonance connecting point of the TLC II type resonance circuit and the drain electrode of the power switch tube are connected to a second electric connecting point;
the source electrode of the power switch tube is grounded;
the power switch tube comprises a triode, an MOS tube and an IGBT;
the first end of the secondary winding of the transformer winding is connected with the first end of the second capacitor through an output rectifier diode;
the second end of the second capacitor is grounded;
and the second end of the secondary winding of the transformer winding is grounded.
8. A power converter, comprising: a power input terminal, a first capacitor, a second capacitor, a power switch tube, a rectifier diode, a TLC type II resonant circuit as claimed in any one of claims 1 to 6;
one end of the first capacitor and the power input end are connected to a first connecting point; the other end of the first capacitor is grounded;
the second end of the second capacitor is grounded;
a first resonant connection point of the TLC II type resonant circuit is connected with the first connection point;
a second electrical connection point of the TLC II type resonant circuit and the drain electrode of the power switch tube are connected to a second connection point;
the source electrode of the power switch tube is grounded; the controlled end of the switching tube is connected to the pulse generator;
the power switch tube comprises a triode, an MOS tube and an IGBT;
the anode of the rectifier diode is connected with the second connection point;
and the cathode of the rectifier diode and the first end of the second capacitor are connected with the voltage output end.
9. A power converter, comprising: a power input terminal, a first capacitor, a second capacitor, a power switch tube, a rectifier diode, a TLC type II resonant circuit as claimed in any one of claims 1 to 6;
the power supply input end, the first end of the first capacitor and the drain electrode of the power switch tube are connected to a first connecting point;
the second end of the first capacitor is grounded;
the cathode of the rectifier diode, the source electrode of the power switch tube and the first resonant connection point of the TLC II type resonant circuit are connected to a second connection point; the controlled end of the switching tube is connected to the pulse generator;
the power switch tube comprises a triode, an MOS tube and an IGBT;
a second resonance connecting point of the TLC II type resonance circuit is connected with a first end of a second capacitor to output a voltage end;
and the second end of the second capacitor is grounded.
10. A power converter, comprising: a power input terminal, a first capacitor, a second capacitor, a power switch tube, a rectifier diode, a TLC type II resonant circuit as claimed in any one of claims 1 to 6;
the power input end is connected with the first end of the first capacitor and the drain electrode of the power switch tube to a first connecting point;
the source electrode of the switching tube, a first resonance connection point of the TLC II type resonance circuit and the cathode of the rectifier diode are connected to a second connection point; the controlled end of the power switch tube is connected with the pulse generator;
the power switch tube comprises a triode, an MOS tube and an IGBT;
a second resonant connection point of the TLC II type resonant circuit is grounded; the second end of the first capacitor is grounded;
the anode of the rectifier diode and the second end of the second capacitor are connected with a voltage output end;
and the second end of the second capacitor is grounded.
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