CN112583250A - LLC resonant transformation ware control circuit and LLC resonant transformation circuit - Google Patents
LLC resonant transformation ware control circuit and LLC resonant transformation circuit Download PDFInfo
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- CN112583250A CN112583250A CN202011527385.9A CN202011527385A CN112583250A CN 112583250 A CN112583250 A CN 112583250A CN 202011527385 A CN202011527385 A CN 202011527385A CN 112583250 A CN112583250 A CN 112583250A
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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
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Abstract
The invention provides an LLC resonant converter control circuit and an LLC resonant conversion circuit, wherein the LLC resonant converter control circuit comprises an output current sampling module, an output voltage feedback module and a power controller which are sequentially connected; the output current sampling module is used for collecting a current signal output by the LLC resonant converter, amplifying the current signal according to a preset proportion and then inputting the amplified current signal to the output voltage feedback module; the output voltage feedback module is used for converting the amplified current signal into a voltage signal, comparing the voltage signal with a reference voltage, increasing the output feedback voltage when the voltage signal is lower than the reference voltage, and reducing the output feedback voltage when the voltage signal is higher than the reference voltage; the power controller is used for receiving the feedback voltage and adjusting the working frequency of the LLC resonant converter according to the feedback voltage. The LLC resonant converter control circuit can avoid intermittent driving of the LLC resonant converter during no-load or light-load and reduce the dynamic overshoot swing of the LLC resonant converter.
Description
Technical Field
The invention relates to the field of control circuits, in particular to an LLC resonant converter control circuit and an LLC resonant converter circuit.
Background
In the prior art, an LLC resonant converter has become one of the mainstream dc converters at present due to its high efficiency, high power density and soft switching characteristics. However, under simple closed-loop control, the LLC resonant converter may cause large output ripples at no-load or light-load conditions or when intermittent driving occurs, and howling may be generated when the frequency of intermittent driving is within an audio frequency range. When the output is switched between the no-load state and the full-load state, the load dynamic overshoot swing amplitude is too large due to too large variation of the working frequency.
Disclosure of Invention
In view of the above problems, the present invention provides an LLC resonant converter control circuit and an LLC resonant converter circuit, so as to avoid intermittent driving of the LLC resonant converter during no-load or light-load, and reduce dynamic overshoot swing of the LLC resonant converter.
In order to achieve the purpose, the invention adopts the following technical scheme:
an LLC resonant converter control circuit comprises an output current sampling module, an output voltage feedback module and a power controller which are connected in sequence;
the output current sampling module is used for collecting a current signal output by the LLC resonant converter, amplifying the current signal according to a preset proportion and then inputting the amplified current signal to the output voltage feedback module;
the output voltage feedback module is used for converting the amplified current signal into a voltage signal, comparing the voltage signal with a reference voltage, increasing the output feedback voltage when the voltage signal is lower than the reference voltage, and decreasing the output feedback voltage when the voltage signal is higher than the reference voltage;
and the power controller is used for receiving the feedback voltage and adjusting the working frequency of the LLC resonant converter according to the feedback voltage.
Preferably, in the LLC resonant converter control circuit, the power controller increases the operating frequency of the LLC resonant converter when the received feedback voltage increases, and decreases the operating frequency of the LLC resonant converter when the received feedback voltage decreases.
Preferably, in the LLC resonant converter control circuit, the output current sampling module includes a differential operational amplifier circuit.
Preferably, in the LLC resonant converter control circuit, the differential operational amplifier circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a differential operational amplifier, and a first capacitor;
a negative input pin of the differential operational amplifier is connected with the first resistor, a positive input pin of the differential operational amplifier is connected with the second resistor, and a current signal output by the LLC resonant converter is acquired through the first resistor and the second resistor;
one end of the third resistor is connected with the positive input pin of the differential operational amplifier, and the other end of the third resistor is grounded;
one end of the fourth resistor is connected with a negative input pin of the differential operational amplifier, and the other end of the fourth resistor is connected with an output pin of the differential operational amplifier;
one end of the first capacitor is connected with a driving power supply pin of the differential operational amplifier, and the other end of the first capacitor is grounded.
Preferably, in the LLC resonant converter control circuit, the output voltage feedback module includes a voltage divider circuit and a voltage comparator circuit connected in sequence;
the voltage division circuit is used for receiving the current signal, converting the current signal into a voltage signal and dividing the voltage;
the voltage comparison circuit is used for receiving the voltage signal after voltage division, comparing the voltage signal with a reference voltage, increasing the output feedback voltage when the voltage signal is lower than the reference voltage, and decreasing the output feedback voltage when the voltage signal is higher than the reference voltage.
Preferably, in the LLC resonant converter control circuit, the voltage comparison circuit includes a voltage comparator and a second capacitor;
the positive input end of the voltage comparator is used for receiving the reference voltage, the negative input end of the voltage comparator is used for receiving the voltage signal, and the output pin of the voltage comparator is used for connecting the power controller;
one end of the second capacitor is connected with a driving power supply pin of the voltage comparator, and the other end of the second capacitor is grounded.
Preferably, in the LLC resonant converter control circuit, the voltage divider circuit includes a fifth resistor, a sixth resistor, and a seventh resistor;
one end of the fifth resistor is used for being connected with the negative electrode input end, and the other end of the fifth resistor is used for receiving the amplified current signal;
one end of the sixth resistor is used for being connected with the negative electrode input end, and the other end of the sixth resistor is used for being connected with the voltage output end;
and one end of the seventh resistor is connected with the negative electrode input end, and the other end of the seventh resistor is grounded.
Preferably, in the LLC resonant converter control circuit, the voltage comparison circuit includes TL 431.
The invention also provides an LLC resonant conversion circuit, which comprises an LLC resonant converter and an LLC resonant converter control circuit connected with the LLC resonant converter.
Preferably, in the LLC resonant converter circuit, the LLC resonant converter includes a full-bridge LLC resonant converter and a half-bridge LLC resonant converter.
The invention provides an LLC resonant converter control circuit, which comprises an output current sampling module, an output voltage feedback module and a power controller which are sequentially connected; the output current sampling module is used for collecting a current signal output by the LLC resonant converter, amplifying the current signal according to a preset proportion and then inputting the amplified current signal to the output voltage feedback module; the output voltage feedback module is used for converting the amplified current signal into a voltage signal, comparing the voltage signal with a reference voltage, increasing the output feedback voltage when the voltage signal is lower than the reference voltage, and decreasing the output feedback voltage when the voltage signal is higher than the reference voltage; and the power controller is used for receiving the feedback voltage and adjusting the working frequency of the LLC resonant converter according to the feedback voltage. The LLC resonant converter control circuit can improve the working frequency of the LLC resonant converter when the LLC resonant converter is in light load or no load, so that the LLC resonant converter is prevented from being driven intermittently, and can reduce the working frequency of the LLC resonant converter when the LLC resonant converter is in heavy load from no load so as to reduce the dynamic overshoot amplitude of the LLC resonant converter.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings required to be used in the embodiments will be briefly described below, and it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope of the present invention. Like components are numbered similarly in the various figures.
Fig. 1 is a schematic structural diagram of an LLC resonant converter control circuit provided in embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of an LLC resonant converter control circuit provided in embodiment 2 of the present invention;
fig. 3 is a schematic structural diagram of an LLC resonant converter control circuit according to embodiment 3 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Hereinafter, the terms "including", "having", and their derivatives, which may be used in various embodiments of the present invention, are only intended to indicate specific features, numbers, steps, operations, elements, components, or combinations of the foregoing, and should not be construed as first excluding the existence of, or adding to, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.
Example 1
Fig. 1 is a schematic structural diagram of an LLC resonant converter control circuit provided in embodiment 1 of the present invention.
The LLC resonant converter control circuit 100 includes an output current sampling module 110, an output voltage feedback module 120, and a power controller 130, which are connected in sequence;
the output current sampling module 110 is configured to collect a current signal output by the LLC resonant converter, amplify the current signal according to a preset ratio, and input the amplified current signal to the output voltage feedback module 120;
in the embodiment of the invention, the LLC resonant converter becomes one of the mainstream dc converters at present due to its high efficiency, high power density and soft switching characteristics. However, under simple closed-loop control, the LLC resonant converter may cause large output ripples at no-load or light-load conditions or when intermittent driving occurs, and howling may be generated when the frequency of intermittent driving is within an audio frequency range. When the output is switched between the no-load state and the full-load state, the load dynamic overshoot swing amplitude is too large due to too large variation of the working frequency. That is, the control logic of the LLC resonant converter under different output load conditions is: when the output load is light, the required gain is low, and the working frequency needs to be adjusted to be high; when a load is output, the required gain is high, and the working frequency needs to be adjusted to be low; secondly, the control logic corresponding to the voltage regulating direction of the output voltage is as follows: when the output voltage is adjusted up, the gain is reduced, and the working frequency needs to be adjusted to be low; when the output voltage is adjusted downwards, the gain is increased, and the working frequency needs to be adjusted to be higher. Therefore, through the output current sampling module 110, the output voltage feedback module 120, and the power controller 130 connected in sequence, the working frequency of the LLC resonant converter can be adjusted to implement the control logic, thereby avoiding intermittent driving and excessive load dynamic overshoot swing.
In the embodiment of the present invention, the output current sampling module 110 may be connected to an output end of the LLC resonant converter through a branch to collect a current signal output by the LLC resonant converter, and then the current signal is linearly amplified in proportion by an operational amplifier circuit provided in the output current sampling module 110, so as to facilitate subsequent analysis and comparison of the amplified current signal, thereby obtaining a current working state of the LLC resonant converter.
The output voltage feedback module 120 is configured to convert the amplified current signal into a voltage signal, compare the voltage signal with a reference voltage, increase an output feedback voltage when the voltage signal is lower than the reference voltage, and decrease the output feedback voltage when the voltage signal is higher than the reference voltage;
in the embodiment of the present invention, the output voltage feedback module 120 is provided with a voltage comparison circuit, and after receiving the amplified current signal, the output voltage feedback module may first collect a corresponding voltage signal through a resistor, and then compare the voltage signal with an input reference voltage, where the reference voltage is set by a user, and the setting of the reference voltage is usually higher than a conventional design value, so as to ensure that the high frequency pause is avoided in the no-load state, and the feedback voltage is correspondingly reduced as the output load increases.
The power controller 130 is configured to receive the feedback voltage, and adjust an operating frequency of the LLC resonant converter according to the feedback voltage.
In this embodiment of the present invention, the power controller 130 increases the operating frequency of the LLC resonant converter when the received feedback voltage is increased, and decreases the operating frequency of the LLC resonant converter when the received feedback voltage is decreased. That is, when the LLC resonant converter is lightly loaded or unloaded, the power controller 130 is used to increase the working frequency of the LLC resonant converter, so as to avoid intermittent driving of the LLC resonant converter, and when the LLC resonant converter is loaded from unloaded to loaded, the power controller 130 is used to decrease the working frequency of the LLC resonant converter, so as to decrease the dynamic overshoot swing of the LLC resonant converter.
Example 2
Fig. 2 is a schematic structural diagram of an LLC resonant converter control circuit according to embodiment 2 of the present invention.
The LLC resonant converter control circuit 200 includes an output current sampling module 210, an output voltage feedback module 220, and a power controller 230, which are connected in sequence;
the output current sampling module 210 is configured to collect a current signal output by the LLC resonant converter, amplify the current signal according to a preset ratio, and input the amplified current signal to the output voltage feedback module 220;
the output voltage feedback module 220 is configured to convert the amplified current signal into a voltage signal, compare the voltage signal with a reference voltage, increase an output feedback voltage when the voltage signal is lower than the reference voltage, and decrease the output feedback voltage when the voltage signal is higher than the reference voltage;
the power controller 230 is configured to receive the feedback voltage, and adjust an operating frequency of the LLC resonant converter according to the feedback voltage.
The output current sampling module 210 includes a differential operational amplifier circuit 211.
The output voltage feedback module 220 includes a voltage divider 221 and a voltage comparator 222 connected in sequence;
the voltage dividing circuit 221 is configured to receive the current signal, convert the current signal into a voltage signal, and divide the voltage;
the voltage comparison circuit 222 is configured to receive the divided voltage signal, compare the voltage signal with a reference voltage, increase an output feedback voltage when the voltage signal is lower than the reference voltage, and decrease the output feedback voltage when the voltage signal is higher than the reference voltage.
In an embodiment of the present invention, the voltage comparison circuit 222 includes an operational amplifier circuit and a TL431 circuit (TL431, a controllable precision voltage regulator).
Example 3
Fig. 3 is a schematic structural diagram of an LLC resonant converter control circuit according to embodiment 3 of the present invention.
The LLC resonant converter control circuit 300 includes a differential operational amplifier circuit 310, a voltage divider circuit 320, a voltage comparator circuit 330, and a power controller 340 connected in sequence;
the difference operational amplification circuit 310 is configured to collect a current signal output by the LLC resonant converter, and amplify the current signal according to a preset ratio.
The voltage dividing circuit 320 is configured to receive the amplified current signal, convert the current signal into a voltage signal, and divide the voltage signal.
The voltage comparison circuit 330 is configured to receive the divided voltage signal, compare the voltage signal with a reference voltage, increase an output feedback voltage when the voltage signal is lower than the reference voltage, and decrease the output feedback voltage when the voltage signal is higher than the reference voltage.
The power controller 340 increases the operating frequency of the LLC resonant converter when the received feedback voltage increases, and decreases the operating frequency of the LLC resonant converter when the received feedback voltage decreases.
The differential operational amplifier circuit 310 comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a differential operational amplifier U1 and a first capacitor C1;
a negative electrode input pin INA-of the differential operational amplifier U1 is connected with the first resistor R1, a positive electrode input pin INA + of the differential operational amplifier U1 is connected with the second resistor R2, and a current signal output by the LLC resonant converter is acquired through the first resistor R1 and the second resistor R2;
one end of the third resistor R3 is connected with the positive input pin INA + of the differential operational amplifier U1, and the other end is grounded;
one end of the fourth resistor R4 is connected with the negative input pin INA-of the differential operational amplifier U1, and the other end is connected with the output pin OUT _ A of the differential operational amplifier U1;
one end of the first capacitor C1 is connected to the driving power supply pin V + of the differential operational amplifier U1, and the other end is grounded.
The voltage divider circuit 320 comprises a fifth resistor R5, a sixth resistor R6 and a seventh resistor R7;
one end of the fifth resistor R5 is used for connecting the negative input end INA-, and the other end is used for receiving the amplified current signal;
one end of the sixth resistor R6 is connected with the negative input terminal INA-, and the other end is connected with the voltage output terminal VOUT; the voltage output end VOUT outputs voltage to a power supply system of the LLC resonant converter so as to perform voltage feedback on the power supply system.
One end of the seventh resistor R7 is connected to the negative input INA-, and the other end is connected to ground.
The voltage comparison circuit 330 includes a voltage comparator and a second capacitor;
the positive input terminal INA + of the voltage comparator is used for receiving the reference voltage VREF, the negative input terminal INA-is used for receiving the voltage signal, and the output pin is used for connecting the power controller 340;
one end of the second capacitor C2 is connected to the driving power supply pin V + of the voltage comparator, and the other end is grounded.
In the embodiment of the invention, the LLC resonant converter control circuit can effectively solve the problem of large output ripple of intermittent drive work of the LLC resonant converter during no-load or light-load and improve the problem of large output dynamic overshoot of the LLC resonant converter during the switching between no-load and full-load states.
The invention also provides an LLC resonant conversion circuit, which comprises an LLC resonant converter and the LLC resonant converter control circuit connected with the LLC resonant converter. The LLC resonant converter comprises a full-bridge LLC resonant converter and a half-bridge LLC resonant converter.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The LLC resonant converter control circuit is characterized by comprising an output current sampling module, an output voltage feedback module and a power controller which are sequentially connected;
the output current sampling module is used for collecting a current signal output by the LLC resonant converter, amplifying the current signal according to a preset proportion and then inputting the amplified current signal to the output voltage feedback module;
the output voltage feedback module is used for converting the amplified current signal into a voltage signal, comparing the voltage signal with a reference voltage, increasing the output feedback voltage when the voltage signal is lower than the reference voltage, and decreasing the output feedback voltage when the voltage signal is higher than the reference voltage;
and the power controller is used for receiving the feedback voltage and adjusting the working frequency of the LLC resonant converter according to the feedback voltage.
2. The LLC resonant converter control circuit of claim 1, wherein said power controller increases an operating frequency of the LLC resonant converter when said received feedback voltage increases and decreases an operating frequency of the LLC resonant converter when said received feedback voltage decreases.
3. The LLC resonant converter control circuit of claim 1, wherein said output current sampling module comprises a differential operational amplification circuit.
4. The LLC resonant converter control circuit of claim 3, wherein said differential operational amplification circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a differential operational amplifier and a first capacitor;
a negative input pin of the differential operational amplifier is connected with the first resistor, a positive input pin of the differential operational amplifier is connected with the second resistor, and a current signal output by the LLC resonant converter is acquired through the first resistor and the second resistor;
one end of the third resistor is connected with the positive input pin of the differential operational amplifier, and the other end of the third resistor is grounded;
one end of the fourth resistor is connected with a negative input pin of the differential operational amplifier, and the other end of the fourth resistor is connected with an output pin of the differential operational amplifier;
one end of the first capacitor is connected with a driving power supply pin of the differential operational amplifier, and the other end of the first capacitor is grounded.
5. The LLC resonant converter control circuit of claim 1, wherein the output voltage feedback module comprises a voltage divider circuit and a voltage comparison circuit connected in sequence;
the voltage division circuit is used for receiving the current signal, converting the current signal into a voltage signal and dividing the voltage;
the voltage comparison circuit is used for receiving the voltage signal after voltage division, comparing the voltage signal with a reference voltage, increasing the output feedback voltage when the voltage signal is lower than the reference voltage, and decreasing the output feedback voltage when the voltage signal is higher than the reference voltage.
6. The LLC resonant converter control circuit of claim 5, wherein said voltage comparison circuit comprises a voltage comparator and a second capacitor;
the positive input end of the voltage comparator is used for receiving the reference voltage, the negative input end of the voltage comparator is used for receiving the voltage signal, and the output pin of the voltage comparator is used for connecting the power controller;
one end of the second capacitor is connected with a driving power supply pin of the voltage comparator, and the other end of the second capacitor is grounded.
7. The LLC resonant converter control circuit of claim 6, wherein said voltage divider circuit comprises a fifth resistor, a sixth resistor and a seventh resistor;
one end of the fifth resistor is used for being connected with the negative electrode input end, and the other end of the fifth resistor is used for receiving the amplified current signal;
one end of the sixth resistor is used for being connected with the negative electrode input end, and the other end of the sixth resistor is used for being connected with the voltage output end;
and one end of the seventh resistor is connected with the negative electrode input end, and the other end of the seventh resistor is grounded.
8. The LLC resonant converter control circuit of claim 5, wherein said voltage comparison circuit comprises TL 431.
9. An LLC resonant converter circuit, characterized in that it comprises an LLC resonant converter, and an LLC resonant converter control circuit as claimed in any one of claims 1 to 8 connected to said LLC resonant converter.
10. The LLC resonant conversion circuit of claim 9, wherein said LLC resonant converter comprises a full bridge LLC resonant converter and a half bridge LLC resonant converter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011527385.9A CN112583250A (en) | 2020-12-22 | 2020-12-22 | LLC resonant transformation ware control circuit and LLC resonant transformation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011527385.9A CN112583250A (en) | 2020-12-22 | 2020-12-22 | LLC resonant transformation ware control circuit and LLC resonant transformation circuit |
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| CN112583250A true CN112583250A (en) | 2021-03-30 |
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| CN202011527385.9A Pending CN112583250A (en) | 2020-12-22 | 2020-12-22 | LLC resonant transformation ware control circuit and LLC resonant transformation circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114421781A (en) * | 2022-03-31 | 2022-04-29 | 深圳市芯茂微电子有限公司 | Control method of resonant converter |
| CN115025388A (en) * | 2022-06-24 | 2022-09-09 | 深圳邦健生物医疗设备股份有限公司 | Defibrillator high-voltage generation circuit and method based on LLC resonance transformation |
| CN115955090A (en) * | 2023-03-13 | 2023-04-11 | 季华实验室 | Control circuit of magnetron high-voltage power supply |
| CN117639518A (en) * | 2024-01-26 | 2024-03-01 | 西安图为电气技术有限公司 | Bidirectional LLC resonant converter control method and device |
| CN117833686A (en) * | 2024-03-05 | 2024-04-05 | 广东省洛仑兹技术股份有限公司 | LLC resonant converter control system with wide gain adjustment range |
-
2020
- 2020-12-22 CN CN202011527385.9A patent/CN112583250A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114421781A (en) * | 2022-03-31 | 2022-04-29 | 深圳市芯茂微电子有限公司 | Control method of resonant converter |
| CN114421781B (en) * | 2022-03-31 | 2022-07-15 | 深圳市芯茂微电子有限公司 | Control method of resonant converter |
| CN115025388A (en) * | 2022-06-24 | 2022-09-09 | 深圳邦健生物医疗设备股份有限公司 | Defibrillator high-voltage generation circuit and method based on LLC resonance transformation |
| CN115955090A (en) * | 2023-03-13 | 2023-04-11 | 季华实验室 | Control circuit of magnetron high-voltage power supply |
| CN117639518A (en) * | 2024-01-26 | 2024-03-01 | 西安图为电气技术有限公司 | Bidirectional LLC resonant converter control method and device |
| CN117639518B (en) * | 2024-01-26 | 2024-04-23 | 西安图为电气技术有限公司 | Bidirectional LLC resonant converter control method and device |
| CN117833686A (en) * | 2024-03-05 | 2024-04-05 | 广东省洛仑兹技术股份有限公司 | LLC resonant converter control system with wide gain adjustment range |
| CN117833686B (en) * | 2024-03-05 | 2024-05-28 | 广东省洛仑兹技术股份有限公司 | LLC resonant converter control system with wide gain adjustment range |
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