CN219833976U - Protection circuit applied to LLC resonant converter and resonant converter - Google Patents
Protection circuit applied to LLC resonant converter and resonant converter Download PDFInfo
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- CN219833976U CN219833976U CN202223526274.3U CN202223526274U CN219833976U CN 219833976 U CN219833976 U CN 219833976U CN 202223526274 U CN202223526274 U CN 202223526274U CN 219833976 U CN219833976 U CN 219833976U
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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
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- 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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Abstract
The utility model discloses a protection circuit applied to an LLC resonant converter, which is characterized by comprising the following components: a current transformer module, a comparator module, and an isolator module; the comparator module is respectively connected with the current transformer module and the isolator module, the current transformer is used for being connected with the primary side of the LLC resonant converter, and the output end of the isolator module is used for being connected with the main control module of the LLC resonant converter; the current transformer module collects primary side current in the LLC resonant converter and transmits the current to the comparator module; the comparator module sends a second level signal to the main control module through the isolator module when the current is larger than the reference current; when the master control module receives the second level signal, the master control module stops outputting the PWM control signal to the switching tube on the primary side of the LLC resonant converter. The utility model has simple circuit, small occupied space and high practicability.
Description
Technical Field
The utility model belongs to the technical field of LLC resonant circuits, and particularly relates to a protection circuit applied to an LLC resonant converter and the resonant converter.
Background
In the application of a switching power supply, an LLC resonant converter has become a DC/DC topology which is paid attention to in recent decades due to the characteristics of excellent soft switching, EMI, high efficiency, high power density and the like, and is widely applied to the fields of consumer electronics, industry, communication and the like.
In actual operation of the LLC resonant converter, the LLC resonant converter needs to be protected and shut down rapidly due to short circuit caused by abnormal output load or abnormal LLC resonant converter, damage is reduced to the minimum range, and loss is reduced.
At present, the LLC resonant converter is mainly divided into digital control and analog control, and the two control chips are commonly grounded with the output side no matter adopting digital control or analog control, because the two control chips are commonly grounded with the output side, isolation sampling is required for the output voltage and output current acquisition circuits, the sampling circuits and the control circuits are complex, and the production cost is increased.
The utility model provides a protection circuit for realizing short-circuit protection of the primary side of an LLC resonant converter.
Disclosure of Invention
The embodiment of the utility model provides a protection circuit applied to an LLC resonant converter and the resonant converter, so as to realize short-circuit protection of the primary side of the LLC resonant converter.
A first aspect of an embodiment of the present utility model provides a protection circuit applied to an LLC resonant converter, including: a current transformer module, a comparator module, and an isolator module;
the comparator module is respectively connected with the current transformer module and the isolator module, the current transformer module is used for being connected with the primary side of the LLC resonant converter, and the output end of the isolator module is used for being connected with the main control module of the LLC resonant converter;
the current transformer module collects primary side current in the LLC resonant converter and transmits the current to the comparator module; the comparator module compares the current with the reference current, and when the current is not greater than the reference current, the first level signal is sent to the main control module through the isolator module, and when the current is greater than the reference current, the second level signal is sent to the main control module through the isolator module;
when the master control module receives the second level signal, the master control module stops outputting the PWM control signal to the switching tube on the primary side of the LLC resonant converter.
In one embodiment, a current transformer module includes: the current transformer, the first diode, the second diode, the third diode, the fourth diode, the first resistor, the second resistor, the third resistor and the first capacitor;
the primary side of the current transformer is connected with the primary side of the LLC resonant converter, the first end of the secondary side of the current transformer is connected with the cathode of the first diode and the anode of the second diode respectively, and the second end of the secondary side of the current transformer is connected with the cathode of the third diode and the anode of the fourth diode respectively;
the first end of the first resistor is respectively connected with the first end of the second resistor, the first end of the third resistor, the first end of the first capacitor, the anode of the first diode, the anode of the third diode and the first grounding end, and the second end of the first resistor is respectively connected with the second end of the second resistor, the second end of the third resistor, the second end of the first capacitor, the cathode of the second diode and the cathode of the fourth diode;
the cathode of the second diode is also connected with the comparator module.
In one embodiment, the comparator module comprises: the comparator chip, the second capacitor, the fourth resistor and the fifth resistor;
the comparator chip is respectively connected with the second end of the fourth resistor and the isolator module, the second end of the comparator chip is connected with the second grounding end, the third end of the comparator chip is respectively connected with the first end of the second capacitor and the first end of the fifth resistor, the fourth end of the comparator chip is used for receiving external reference current, and the fifth end of the comparator chip is respectively connected with the first end of the fourth resistor and the first power supply end;
the second end of the second capacitor is connected with the second grounding end, and the second end of the fifth resistor is connected with the current transformer module.
In one embodiment, an isolator module includes: the digital signal isolation chip, the third capacitor, the fourth capacitor, the fifth capacitor and the sixth capacitor;
the digital signal isolation chip is characterized in that a first power end is respectively connected with a first end of a third capacitor, a first end of a fourth capacitor and a second power supply end, a first ground end is respectively connected with a second end of the third capacitor, a second end of the fourth capacitor and a second ground end, a signal receiving end is connected with a comparator module, a signal output end is used for being connected with a main control module, a second power end is respectively connected with a first end of a fifth capacitor, a first end of a sixth capacitor and the third power supply end, and a second ground end is respectively connected with a second end of the fifth capacitor, a second end of the sixth capacitor and the first ground end.
In one embodiment, the protection circuit further comprises a reference module connected to the comparator module for providing a reference current to the comparator module.
In one embodiment, the reference module includes: a sixth resistor, a seventh resistor, and a seventh capacitor;
the first end of the sixth resistor is connected with the fourth power supply end, and the second end of the sixth resistor is respectively connected with the first end of the seventh capacitor, the first end of the seventh resistor and the isolator module;
the second end of the seventh resistor and the second end of the seventh capacitor are both connected with the second grounding end.
In one embodiment, the protection circuit includes a signal transmission module connected between the isolator module and the main control module.
In one embodiment, the signal transmission module includes: a laser diode, an eighth resistor, a ninth resistor, and an eighth capacitor;
the laser diode, LD transmitting end is connected with the fifth power supply end, PD receiving end is connected with second end of the eighth electric capacity, second end and first earthing end of the ninth resistance separately, the public end is connected with first end of the eighth resistance, first end of the ninth resistance, second end of the eighth electric capacity and master control module separately;
the first end of the eighth resistor is connected to the isolator module.
A second aspect of an embodiment of the present utility model provides a resonant converter, including a protection circuit as described in any one of the first aspects and applied to an LLC resonant converter, and further including a master control module and an LLC resonant converter.
In one embodiment, the master control module includes a master control chip and a driver chip.
Compared with the prior art, the embodiment of the utility model has the beneficial effects that: in this embodiment, when the primary side current is greater than the reference current, that is, the primary side of the LLC resonant converter may have a short circuit, the main control module may stop outputting the PWM control signal to the switching tube of the primary side of the LLC resonant converter, so as to achieve the purpose of protecting the circuit, and achieve the short circuit protection of the primary side of the LLC resonant converter.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a protection circuit applied to an LLC resonant converter according to an embodiment of the utility model;
fig. 2 is a schematic circuit diagram of a current transformer according to an embodiment of the present utility model;
FIG. 3 is a schematic circuit diagram of a comparator module according to an embodiment of the present utility model;
FIG. 4 is a schematic circuit diagram of an isolator module according to an embodiment of the present utility model;
FIG. 5 is a schematic diagram of another protection circuit applied to an LLC resonant converter according to an embodiment of the present utility model;
FIG. 6 is a schematic circuit diagram of a reference module according to an embodiment of the present utility model;
fig. 7 is a schematic circuit diagram of a signal transmission module according to an embodiment of the utility model;
fig. 8 is a schematic circuit diagram of a resonant converter according to an embodiment of the present utility model.
Detailed Description
In order to make the present solution better understood by those skilled in the art, the technical solution in the present solution embodiment will be clearly described below with reference to the accompanying drawings in the present solution embodiment, and it is obvious that the described embodiment is an embodiment of a part of the present solution, but not all embodiments. All other embodiments, based on the embodiments in this solution, which a person of ordinary skill in the art would obtain without inventive faculty, shall fall within the scope of protection of this solution.
The term "comprising" in the description of the present solution and the claims and in the above-mentioned figures, as well as any other variants, means "including but not limited to", intended to cover a non-exclusive inclusion, and not limited to only the examples listed herein. Furthermore, the terms "first" and "second," etc. are used for distinguishing between different objects and not for describing a particular sequential order.
The implementation of the utility model is described in detail below with reference to the specific drawings:
fig. 1 is a schematic diagram of a protection circuit applied to an LLC resonant converter according to an embodiment of the utility model; for convenience of explanation, only the portions related to the embodiments of the present utility model are shown, and the details are as follows:
in actual operation of the LLC resonant converter, the LLC resonant converter needs to be protected and shut down rapidly due to short circuit caused by abnormal output load or abnormal LLC resonant converter, damage is reduced to the minimum range, and loss is reduced.
There are many kinds of short-circuit protection circuits of the existing LLC resonant converter, for example, a resonant capacitor clamping circuit is added to realize short-circuit protection. However, the short-circuit protection circuits all need a larger volume, and cannot meet the use requirements of the current LLC resonant converter for high power density and small volume, so that it is necessary to provide a small-volume LLC short-circuit protection circuit.
As shown in fig. 1, a protection circuit 10 applied to an LLC resonant converter according to an embodiment of the present utility model may include: a current transformer module 11, a comparator module 12, and an isolator module 13;
the comparator module 12 is respectively connected with the current transformer module 11 and the isolator module, the current transformer module 11 is used for being connected with the primary side of the LLC resonant converter 20, and the output end of the isolator module 13 is used for being connected with the main control module 21 of the LLC resonant converter 20;
the current transformer module 11 collects the primary side current in the LLC resonant converter 20 and transmits the current to the comparator module 12; the comparator module 12 compares the current with the reference current, and when the current is not greater than the reference current, the first level signal is sent to the main control module 21 through the isolator module 13, and when the current is greater than the reference current, the second level signal is sent to the main control module 21 through the isolator module 13;
when receiving the second level signal, the master control module 21 stops outputting the PWM control signal to the switching tube on the primary side of the LLC resonant converter 20.
Alternatively, the first level signal and the second level signal are signals with different levels, for example, the first level signal may be a high level signal and the second level signal may be a low level signal. Alternatively, the first level signal is a low level signal and the second level signal is a high level signal.
The LLC resonant converter 20 may include a first current transformation module, a transformer module, and a second current transformation module connected in sequence, the first current transformation module being a primary side of the LLC resonant converter 20, the second current transformation module being a secondary side of the LLC resonant converter 20. The main control module 21 is configured to provide PWM control signals to the switching tubes in the first current transformation module and to provide PWM control signals to the switching tubes in the second current transformation module.
In the present embodiment, the current transformer module 11 is connected to the primary side of the LLC resonant converter 20 for collecting the primary side current of the LLC resonant converter 20.
As shown in fig. 1, the primary side of the LLC resonant converter includes a first switching tube V1 and a second switching tube V2, and the main control module 21 outputs PWM control signals mainly for controlling V1 and V2. When the master control module 21 stops outputting the PWM control signal, the LLC resonant converter 20 stops operating, and short-circuit protection can be achieved.
In this embodiment, when the primary side current is greater than the reference current, that is, the primary side of the LLC resonant converter 20 may have a short circuit, the master control module 21 may stop outputting the PWM control signal to the switching tube of the primary side of the LLC resonant converter, so as to achieve the purpose of protecting the circuit.
According to the embodiment, through the combination of the current transformer module and the isolator module, a small-size protection circuit is designed, the isolator module is used for realizing the primary machine isolation function, the current transformer module only serves as a current signal acquisition function, the primary machine voltage-withstanding problem is not considered, the size can be greatly reduced, the production cost is low, and the practicability is high.
Fig. 2 is a schematic circuit diagram of a current transformer according to an embodiment of the present utility model; as shown in fig. 2, in an embodiment, the current transformer module 11 includes: the current transformer TA, the first diode D1, the second diode D2, the third diode D3, the fourth diode D4, the first resistor R1, the second resistor R2, the third resistor R3 and the first capacitor C1;
the primary side of the current transformer TA is used for being connected with the primary side of the LLC resonant converter 20, the first end of the secondary side is respectively connected with the cathode of the first diode D1 and the anode of the second diode D2, and the second end of the secondary side is respectively connected with the cathode of the third diode D3 and the anode of the fourth diode D4;
the first end of the first resistor R1 is respectively connected with the first end of the second resistor R2, the first end of the third resistor R3, the first end of the first capacitor C1, the anode of the first diode D1, the anode of the third diode D3 and the first grounding end SGND, and the second end is respectively connected with the second end of the second resistor R2, the second end of the third resistor R3, the second end of the first capacitor C1, the cathode of the second diode D2 and the cathode of the fourth diode D4;
the cathode of the second diode D2 is also connected to the comparator module 12, which cathode may be marked as IP terminal for providing the primary side current to the comparator module 12.
FIG. 3 is a schematic circuit diagram of a comparator module according to an embodiment of the present utility model; as shown in fig. 3, in the present embodiment, the comparator module 12 includes: the comparator chip U1, the second capacitor C2, the fourth resistor R4 and the fifth resistor R5;
the comparator chip U1 is respectively connected with the second end of the fourth resistor R4 and the isolator module 13 at the first end, the second end is connected with the second grounding end PGND, the third end is respectively connected with the first end of the second capacitor C2 and the first end of the fifth resistor R5, the fourth end is used for receiving external reference current, and the fifth end is respectively connected with the first end of the fourth resistor R4 and the first power supply end VCC 1;
the second end of the second capacitor R2 is connected to the second ground terminal PGND, and the second end of the fifth resistor R5 is connected to the current transformer module 11.
Wherein a first end of the comparator chip U1 may be labeled IPTZP for delivering a comparison signal to the isolator module 13, the comparison signal comprising either a first level signal or a second level signal. The fourth terminal of the comparator chip may be labeled as the IPJZ terminal for receiving the reference current. A second terminal of the fifth resistor R5 may be denoted as IP terminal, and is connected to the cathode of the second diode D2 for receiving the primary side current collected by the current transformer module 11. The first power supply terminal VCC1 may provide a +3.3v voltage.
FIG. 4 is a schematic circuit diagram of an isolator module according to an embodiment of the present utility model; as shown in fig. 4, in the present embodiment, the isolator module 13 includes: the digital signal isolation chip U2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5 and the sixth capacitor C6;
the digital signal isolation chip U2, the first power supply terminal VDD1 is connected to the first end of the third capacitor R3, the first end of the fourth capacitor R4, and the second power supply terminal VCC2, the first ground terminal GND1 is connected to the second end of the third capacitor R3, the second end of the fourth capacitor R4, and the second ground terminal PGND, the signal receiving terminal INA is connected to the comparator module 12, the signal output terminal OUTA is connected to the main control module 21, the second power supply terminal VDD2 is connected to the first end of the fifth capacitor R5, the first end of the sixth capacitor R6, and the third power supply terminal VCC3, and the second ground terminal GND2 is connected to the second end of the fifth capacitor C5, the second end of the sixth capacitor C6, and the first ground terminal SGND.
The signal receiving end INA of the digital signal isolation chip U2 may be denoted as IPTZP end, and is configured to receive the comparison signal sent by the first end of the comparator module 12. The signal output end of the digital signal isolation chip U2 can be marked as an IPTZS end and is used for transmitting the comparison signal after isolation transformation to the main control module. The second power supply terminal VCC2 and the third power supply terminal VCC3 are different, and the second power supply terminal VCC2 may be the same as the first power supply terminal VCC 1. The second power supply terminal VCC2 and the third power supply terminal VCC3 may each provide a +3.3v voltage.
FIG. 5 is a schematic diagram of another protection circuit applied to an LLC resonant converter according to an embodiment of the present utility model; in an embodiment, as shown in fig. 5, the protection circuit 10 further includes a reference block 14, the reference block 14 being connected to the comparator block 12 for providing a reference current to the comparator block.
FIG. 6 is a schematic circuit diagram of a reference module according to an embodiment of the present utility model; as shown in fig. 6, in the present embodiment, the reference module 14 may include: a sixth resistor R6, a seventh resistor R7 and a seventh capacitor C7;
a sixth resistor R6, a first end of which is connected to the fourth power supply end VCC4, and a second end of which is connected to the first end of the seventh capacitor C7, the first end of the seventh resistor R7, and the isolator module 12, respectively;
the second terminal of the seventh resistor R7 and the second terminal of the seventh capacitor C7 are both connected to the second ground terminal PGND.
The second terminal of the sixth resistor may be denoted as IPJZ, and may be used to provide the reference current to the fourth terminal of the comparator chip U1, and the fourth power supply terminal VCC4 may provide a +3.3v voltage, which may be the same as the first power supply terminal VCC 1.
As shown in fig. 5, in the embodiment, the protection circuit 10 includes a signal transmission module 15, and the signal transmission module 15 is connected between the isolator module 13 and the main control module 21.
Fig. 7 is a schematic circuit diagram of a signal transmission module according to an embodiment of the utility model; as shown in fig. 7, in the present embodiment, the signal transmission module 15 includes: a laser diode DA, an eighth resistor R8, a ninth resistor R9, and an eighth capacitor C8;
the emitting end of the laser diode DA, LD is connected with the fifth power supply end VCC5, the PD receiving end is respectively connected with the second end of the eighth capacitor C8, the second end of the ninth resistor R9 and the first grounding end SGND, and the public end is respectively connected with the first end of the eighth resistor R8, the first end of the ninth resistor R9, the second end of the eighth capacitor C8 and the main control module 21;
the first end of the eighth resistor R8 is connected to the isolator module 13.
The first end of the eighth resistor R8 may be denoted as IPTZS, and is configured to receive the comparison signal transmitted by the signal output end of the digital signal isolation chip U2, where the fifth power supply end VCC5 may provide a +3.3v voltage, and the fifth power supply end VCC5 may be the same as the third power supply end VCC 3.
Fig. 8 is a schematic circuit diagram of a resonant converter according to an embodiment of the present utility model. As shown in fig. 8, this embodiment further provides a resonant converter, including the protection circuit 10 in any of the above embodiments, and further including a main control module 21 and an LLC resonant converter 20.
The main control module 21 may include a main control chip and a driving chip.
The operation of the protection circuit 10 will be described with reference to fig. 1 to 8. The primary side current of the LLC resonant converter 20 is collected through the current transformer TA, a current sampling signal is sent to the comparator chip U1 and is compared with a given reference current model, the output signal of the comparator chip U1 is connected with the digital isolation chip U2, primary and secondary isolation is achieved, and the output signal of the digital isolation chip U2 is connected with the main control chip and the driving chip for rapid short-circuit protection.
When the primary side current is larger than the reference current, the signal of the comparator chip U1 is turned over and transmitted to the digital isolation chip U2, the output signal of the digital isolation chip U2 is immediately and rapidly turned over and transmitted to the main control chip and the driving chip, the main control chip closes PWM control signals of the V1 and the V2 and reports faults, and meanwhile the driving chip closes enabling control to close the power control circuit, so that the damage range of short circuit faults is reduced.
Besides, the high-speed optocoupler can be realized by using a current transformer and an optocoupler, but the high-speed optocoupler has larger volume, the reaction time of the common optocoupler is us level and slower than that of a digital isolator ns level, and the effect is inferior to that of using the digital isolator.
The beneficial effects of this embodiment are: through the combination of a current transformer and a digital isolator, a small-size LLC short-circuit protection circuit is designed, the digital isolator is used for realizing the primary machine isolation function, the current transformer only serves as a current signal acquisition function, the primary machine voltage-withstanding problem is not considered, and the size can be greatly reduced. And the LLC resonant converter has the working frequency of 50-500kHz, the response time of the digital signal isolator is ns, the integral response time of the LLC short-circuit protection circuit is 20ns, the real-time protection can be realized, and the reliability of the LLC resonant converter is improved.
The above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims (10)
1. A protection circuit for an LLC resonant converter, comprising: a current transformer module, a comparator module, and an isolator module;
the comparator module is respectively connected with the current transformer module and the isolator module, the current transformer module is used for being connected with the primary side of the LLC resonant converter, and the output end of the isolator module is used for being connected with the main control module of the LLC resonant converter;
the current transformer module collects primary side current in the LLC resonant converter and transmits the current to the comparator module; the comparator module compares the current with a reference current, and when the current is not greater than the reference current, a first level signal is sent to the main control module through the isolator module, and when the current is greater than the reference current, a second level signal is sent to the main control module through the isolator module;
and when the main control module receives the second level signal, stopping outputting a PWM control signal to a switching tube on the primary side of the LLC resonant converter.
2. The protection circuit of claim 1 applied to an LLC resonant converter, wherein the current transformer module includes: the current transformer, the first diode, the second diode, the third diode, the fourth diode, the first resistor, the second resistor, the third resistor and the first capacitor;
the primary side of the current transformer is used for being connected with the primary side of the LLC resonant converter, the first end of the secondary side of the current transformer is respectively connected with the cathode of the first diode and the anode of the second diode, and the second end of the secondary side of the current transformer is respectively connected with the cathode of the third diode and the anode of the fourth diode;
the first end of the first resistor is respectively connected with the first end of the second resistor, the first end of the third resistor, the first end of the first capacitor, the anode of the first diode, the anode of the third diode and the first grounding end, and the second end of the first resistor is respectively connected with the second end of the second resistor, the second end of the third resistor, the second end of the first capacitor, the cathode of the second diode and the cathode of the fourth diode;
the cathode of the second diode is also connected with the comparator module.
3. A protection circuit for an LLC resonant converter as claimed in claim 1 wherein said comparator module comprises: the comparator chip, the second capacitor, the fourth resistor and the fifth resistor;
the comparator chip is characterized in that a first end of the comparator chip is connected with a second end of the fourth resistor and the isolator module respectively, a second end of the comparator chip is connected with a second grounding end, a third end of the comparator chip is connected with a first end of the second capacitor and a first end of the fifth resistor respectively, the fourth end is used for receiving external reference current, and the fifth end of the comparator chip is connected with a first end of the fourth resistor and a first power supply end respectively;
the second end of the second capacitor is connected with the second grounding end, and the second end of the fifth resistor is connected with the current transformer module.
4. A protection circuit for an LLC resonant converter as claimed in claim 1 wherein said isolator module comprises: the digital signal isolation chip, the third capacitor, the fourth capacitor, the fifth capacitor and the sixth capacitor;
the digital signal isolation chip is characterized in that a first power end is respectively connected with a first end of the third capacitor, a first end of the fourth capacitor and a second power supply end, a first ground end is respectively connected with a second end of the third capacitor, a second end of the fourth capacitor and a second ground end, a signal receiving end is connected with the comparator module, a signal output end is connected with the main control module, a second power end is respectively connected with a first end of the fifth capacitor, a first end of the sixth capacitor and a third power supply end, and a second ground end is respectively connected with a second end of the fifth capacitor, a second end of the sixth capacitor and the first ground end.
5. A protection circuit for an LLC resonant converter as claimed in claim 1, further comprising a reference module coupled to the comparator module for providing a reference current to the comparator module.
6. A protection circuit for an LLC resonant converter as claimed in claim 5 wherein said reference module comprises: a sixth resistor, a seventh resistor, and a seventh capacitor;
the first end of the sixth resistor is connected with the fourth power supply end, and the second end of the sixth resistor is respectively connected with the first end of the seventh capacitor, the first end of the seventh resistor and the isolator module;
the second end of the seventh resistor and the second end of the seventh capacitor are both connected with a second grounding end.
7. The protection circuit for an LLC resonant converter of claim 1, wherein said protection circuit includes a signal transmission module coupled between said isolator module and said master module.
8. The protection circuit for an LLC resonant converter of claim 7, wherein said signal transmission module includes: a laser diode, an eighth resistor, a ninth resistor, and an eighth capacitor;
the laser diode, the LD transmitting end is connected with the fifth power supply end, the PD receiving end is respectively connected with the second end of the eighth capacitor, the second end of the ninth resistor and the first grounding end, and the public end is respectively connected with the first end of the eighth resistor, the first end of the ninth resistor, the second end of the eighth capacitor and the main control module;
the first end of the eighth resistor is connected with the isolator module.
9. A resonant converter, characterized by comprising the protection circuit applied to the LLC resonant converter according to any one of the above 1 to 8, and further comprising a master control module and the LLC resonant converter.
10. The resonant converter of claim 9, wherein the master control module comprises a master control chip and a drive chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223526274.3U CN219833976U (en) | 2022-12-28 | 2022-12-28 | Protection circuit applied to LLC resonant converter and resonant converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223526274.3U CN219833976U (en) | 2022-12-28 | 2022-12-28 | Protection circuit applied to LLC resonant converter and resonant converter |
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| CN219833976U true CN219833976U (en) | 2023-10-13 |
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| CN202223526274.3U Active CN219833976U (en) | 2022-12-28 | 2022-12-28 | Protection circuit applied to LLC resonant converter and resonant converter |
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| Country | Link |
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| CN (1) | CN219833976U (en) |
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2022
- 2022-12-28 CN CN202223526274.3U patent/CN219833976U/en active Active
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