CN216209816U - Trap circuit, receiving coil and magnetic resonance imaging system - Google Patents
Trap circuit, receiving coil and magnetic resonance imaging system Download PDFInfo
- Publication number
- CN216209816U CN216209816U CN202122497544.1U CN202122497544U CN216209816U CN 216209816 U CN216209816 U CN 216209816U CN 202122497544 U CN202122497544 U CN 202122497544U CN 216209816 U CN216209816 U CN 216209816U
- Authority
- CN
- China
- Prior art keywords
- resonant
- inductor
- switch
- capacitor
- unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Filters And Equalizers (AREA)
Abstract
The application relates to a trap circuit, a receiving coil and a magnetic resonance imaging system, wherein the trap circuit comprises a resistor R1, an inductor L1, a resonance unit and a switch adjusting unit; one end of the resistor R1 is connected with the positive electrode of the direct-current power supply, and the other end of the resistor R1 is connected with one end of the inductor L1; the other end of the inductor L1 is respectively connected with one end of the resonance unit and one end of the switch adjusting unit; the other end of the resonance unit and the other end of the switch adjusting unit are grounded; the resonance unit and the switch adjusting unit form a resonance loop, and the integral capacitance of the resonance loop is correspondingly adjusted by adjusting the on-off state of the switch adjusting unit. The method solves the problems that the value of the combination of the resonant capacitor and the resonant inductor is limited by the heating of the resonant inductor, and the value of the combination of the resonant capacitor and the resonant inductor is limited; the value range of the combination of the resonant capacitor and the resonant inductor is increased, and the heating of the resonant inductor can be reduced.
Description
Technical Field
The utility model relates to the technical field of magnetic resonance imaging, in particular to a trap circuit, a receiving coil and a magnetic resonance imaging system.
Background
Magnetic resonance imaging is one type of computed tomography that uses the phenomenon of magnetic resonance to acquire electromagnetic signals from the body and reconstruct the body information. The magnetic resonance imaging system applies radio frequency pulse and gradient pulse to a human body in a static magnetic field through a pulse sequence, so that hydrogen protons in the human body are excited to generate a magnetic resonance phenomenon, and corresponding magnetic resonance signals can be received to reconstruct images to obtain corresponding magnetic resonance images. Whereas in magnetic resonance imaging systems magnetic resonance coils are used for receiving magnetic resonance imaging signals, which typically operate at frequencies in the range of tens to hundreds of mhz.
Currently, in the design of the magnetic resonance coil, a series resonant circuit of the trap circuit is connected in parallel with a diode and then is arranged in series in the trap circuit of the magnetic resonance coil. Because the selection of the resonant capacitor in the series resonant circuit is close to the capacitance of the bare coil, the value of the resonant inductor in the series resonant circuit is determined, and the value of the combination of the resonant capacitor and the resonant inductor in the trap circuit is adjusted according to the results of heating test, trap depth and the like. The value of the combination of the resonant capacitor and the resonant inductor is limited by the heating of the resonant inductor, and the problem that the value of the combination of the resonant capacitor and the resonant inductor is limited exists.
At present, an effective solution is not provided aiming at the problem that in the related technology, the value of the combination of the resonant capacitor and the resonant inductor is limited by the heating of the resonant inductor, and the value of the combination of the resonant capacitor and the resonant inductor is limited.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is desirable to provide a trap circuit, a receiving coil and a magnetic resonance imaging system, so as to at least solve the problem in the related art that the value of the combination of the resonant capacitor and the resonant inductor is limited by the heating of the resonant inductor, and the value of the combination of the resonant capacitor and the resonant inductor is limited.
The utility model provides a trap circuit, which comprises a resistor R1, an inductor L1, a resonance unit and a switch adjusting unit, wherein the switch adjusting unit is connected with the resistor R1;
one end of the resistor R1 is connected with the positive electrode of a direct current power supply, and the other end of the resistor R1 is connected with one end of the inductor L1;
the other end of the inductor L1 is connected to one end of the resonance unit and one end of the switching adjustment unit, respectively;
the other end of the resonance unit and the other end of the switch adjusting unit are grounded;
the resonance unit and the switch adjusting unit form a resonance loop, and the integral capacitance of the resonance loop is correspondingly adjusted by adjusting the on-off state of the switch adjusting unit.
In one embodiment, the resonant unit comprises a resonant capacitor Cd1 and a resonant inductor Ld 1;
one end of the resonant capacitor Cd1 is connected to the other end of the inductor L1 and one end of the switching regulator unit, respectively, and the other end of the resonant capacitor Cd1 is connected to one end of the resonant inductor Ld 1;
the other end of the resonant inductor Ld1 is connected to the other end of the switching regulator unit and then grounded.
In one embodiment, the switching regulator unit includes a switch SW1 and a capacitor Cd 2;
one end of the switch SW1 is connected to the other end of the inductor L1 and one end of the resonant capacitor Cd1, respectively, and the other end of the switch SW1 is connected to one end of the capacitor Cd 2;
the other end of the capacitor Cd2 is connected to the other end of the resonant inductor Ld1 and then grounded.
In one embodiment, the switch SW1 is a mechanical switch.
In one embodiment, the resonant unit comprises a resonant capacitor Cd3, a resonant inductor Ld2, a switch SW2 and a capacitor Cd 4;
one end of the resonant capacitor Cd3 is connected to one end of the switch SW2, one end of the switch adjusting unit, and the other end of the inductor L1, respectively, and the other end of the resonant capacitor Cd3 is connected to the other end of the capacitor Cd4 and one end of the resonant inductor Ld2, respectively;
the other end of the switch SW2 is connected with one end of the capacitor Cd 4;
the other end of the resonant inductor Ld2 is connected to the other end of the switching regulator unit and then grounded.
In one embodiment, the switching regulator unit includes a switch SW3, a switch SW4, and a capacitor Cd 5;
one end of the switch SW3 is connected to one end of the resonant capacitor Cd3, one end of the switch SW2 and the other end of the inductor L1, respectively, and the other end of the switch SW3 is connected to one end of the switch SW4 and one end of the capacitor Cd5, respectively;
the other end of the switch SW4 is connected to the other end of the capacitor Cd5 and the other end of the resonant inductor Ld2, and then grounded.
In one embodiment, the dc power supply is a built-in dc power supply or an external dc power supply.
In one embodiment, the inductor L1 is a radio frequency choke inductor.
In a second aspect, an embodiment of the present application provides a receiver coil, including the trap circuit as described in the first aspect above;
the receiving coil is in a detuned state when a resonance unit and a switching adjusting unit in the trap circuit form a resonance loop.
In a third aspect, embodiments of the present application provide a magnetic resonance imaging system including a trap circuit as described in the first aspect above.
The utility model provides a trap circuit, a receiving coil and a magnetic resonance imaging system, wherein the trap circuit comprises a resistor R1, an inductor L1, a resonance unit and a switch adjusting unit; one end of the resistor R1 is connected with the positive electrode of a direct current power supply, and the other end of the resistor R1 is connected with one end of the inductor L1; the other end of the inductor L1 is connected to one end of the resonance unit and one end of the switching adjustment unit, respectively; the other end of the resonance unit and the other end of the switch adjusting unit are grounded; the resonance unit and the switch adjusting unit form a resonance loop, and the integral capacitance of the resonance loop is correspondingly adjusted by adjusting the on-off state of the switch adjusting unit. The on-off state of the switch adjusting unit is adjusted to correspondingly adjust the whole capacitance of the resonant circuit, so that the problem that the value of the combination of the resonant capacitance and the resonant inductance is limited by the heating of the resonant inductance and the value of the combination of the resonant capacitance and the resonant inductance is limited is solved; the value range of the combination of the resonant capacitor and the resonant inductor is increased, and the heating of the resonant inductor can be reduced.
Drawings
Fig. 1 is a block diagram of a trap circuit according to a first embodiment of the present application;
fig. 2 is a schematic structural diagram of a trap circuit according to a second embodiment of the present application;
fig. 3 is a schematic structural diagram of a trap circuit according to a third embodiment of the present application.
Reference numerals: 11. a DC power supply; 12. a resonance unit; 13. a switching adjustment unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments provided in the present application without any inventive step are within the scope of protection of the present application. Moreover, it should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of ordinary skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments without conflict.
Unless defined otherwise, technical or scientific terms referred to herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which this application belongs. When an element is referred to herein as being "on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present. Reference herein to the terms "first," "second," "third," and the like, are merely to distinguish similar objects and do not denote a particular ordering for the objects. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, the present invention provides a trap circuit, which includes a resistor R1, an inductor L1, a resonant unit 12, and a switching unit 13;
one end of the resistor R1 is connected with the positive electrode of the DC power supply 11, and the other end of the resistor R1 is connected with one end of the inductor L1;
the other end of the inductor L1 is connected to one end of the resonance unit 12 and one end of the switching adjustment unit 13, respectively;
the other end of the resonance unit 12 and the other end of the switching adjustment unit 13 are grounded;
the resonant unit 12 and the switch adjusting unit 13 form a resonant circuit, and the overall capacitance of the resonant circuit is adjusted correspondingly by adjusting the on-off state of the switch adjusting unit 13.
The direct-current power supply 11 is sequentially connected in series with a resistor R1 and an inductor L1; the resistor R1 is a current limiting resistor, and its resistance may be 200 ohm-400 ohm. Preferably, the resistor R1 may have a resistance of 274 ohms. The value of the inductance L1 is related to the frequency in the practical application scenario, and the inductance L1 may be 2.7-10 differential. Generally, the lower the frequency in the actual application scene, the higher the value thereof; the higher the frequency in the actual application scenario, the lower its value. I.e. the value of the inductance L1 is inversely proportional to the frequency in the actual application scenario. Such as: the frequency in an actual application scene is 300 Hz, and the value of the inductance L1 is 2.7 differential; in a practical application scenario, the frequency is 56 hz, and the value of the inductance L1 is 10 differential. In other embodiments, the value of the inductance L1 is not limited.
In the prior art, the selection of the resonant capacitor in the series resonant circuit is close to the capacitance of the bare coil, the value of the resonant inductor in the series resonant circuit is determined, and the value of the combination of the resonant capacitor and the resonant inductor in the trap circuit is adjusted according to the results of heating test, trap depth and the like. In the present embodiment, the resonant capacitor in the resonant unit 12 is used as a matching capacitor, and the value of the matching capacitor can be changed by the on-off state of the switching adjustment unit 13, so that the resonant unit 12 and the switching adjustment unit 13 form a series resonant circuit. Energy interconversion does not exist between the direct current power supply 11 and the series resonant circuit, and only interconversion between electric energy and magnetic energy exists between the resonant capacitor and the resonant inductor. The value of the resonance inductance can be correspondingly adjusted under the condition that the resonance capacitance is changed, so that the problem that the value of the combination of the resonance capacitance and the resonance inductance is limited is solved.
The whole capacitance of the resonance loop is correspondingly adjusted through the on-off state of the switch adjusting unit 13, so that the problem that the value of the combination of the resonance capacitance and the resonance inductance is limited by the heating of the resonance inductance, and the value of the combination of the resonance capacitance and the resonance inductance is limited is solved; the value range of the combination of the resonant capacitor and the resonant inductor is increased, and the heating of the resonant inductor can be reduced.
The resonant unit 12 and the switching regulator unit 13 and the combination thereof form a resonant tank as described in detail below:
as shown in fig. 2, a schematic structural diagram of a trap circuit provided in a second embodiment of the present application is shown, wherein a resonant unit 12 includes a resonant capacitor Cd1 and a resonant inductor Ld 1;
one end of a resonant capacitor Cd1 is connected with the other end of the inductor L1 and one end of the switch adjusting unit 13 respectively, and the other end of the resonant capacitor Cd1 is connected with one end of a resonant inductor Ld 1;
the other end of the resonant inductor Ld1 is connected to the other end of the switching regulator unit 13 and then grounded.
Specifically, the off-regulation unit includes a switch SW1 and a capacitor Cd 2;
one end of the switch SW1 is connected with the other end of the inductor L1 and one end of the resonant capacitor Cd1 respectively, and the other end of the switch SW1 is connected with one end of the capacitor Cd 2;
the other end of the capacitor Cd2 is connected to the other end of the resonant inductor Ld1 and then grounded.
The switch SW1 can be a mechanical switch, which has good isolation and does not need to be additionally disposed with a control circuit, thereby achieving the effect of simplifying the circuit. The switch SW1 may also be an electronic switch, such as a touch switch, an inductive switch, or the like. The values of the resonant capacitor Cd1, the resonant inductor Ld1 and the capacitor Cd2 are mutually influenced, and the value of the resonant capacitor Cd1 serving as a matching capacitor can be changed through the capacitor Cd2 in the switch adjusting unit 13, so that the value of the resonant inductor Ld1 is correspondingly influenced, and the whole capacitor of the resonant circuit is further influenced.
The following explains the operation principle of the circuit of the present embodiment:
the Cd1 is connected in series in the receiving coil to be used as a resonant capacitor and a matching capacitor; when switch SW1 is open, the trap circuit is not active. When the switch SW1 is closed, the current of the dc power supply 11 is limited by the current limiting resistor R1 and then supplied to the inductor L1; the current is supplied to the resonant unit 12 and the switching regulator unit 13 through the inductor L1 to form a resonant tank. In a resonant circuit formed with respect to the resonant unit 12 and the switching adjustment unit 13, the resonant capacitor Cd1 and the capacitor Cd2 are connected in series, and form a series resonant circuit together with the resonant inductor Ld1, at this time, the trap circuit starts to operate, so that the coil in which the trap circuit is located is in a detuned state.
As shown in fig. 3, which is a schematic structural diagram of a trap circuit provided in the third embodiment of the present application, wherein the resonant unit 12 includes a resonant capacitor Cd3, a resonant inductor Ld2, a switch SW2, and a capacitor Cd 4;
one end of a resonant capacitor Cd3 is connected with one end of a switch SW2, one end of a switch adjusting unit 13 and the other end of an inductor L1 respectively, and the other end of the resonant capacitor Cd3 is connected with the other end of a capacitor Cd4 and one end of a resonant inductor Ld2 respectively;
the other end of the switch SW2 is connected with one end of a capacitor Cd 4;
the other end of the resonant inductor Ld2 is connected to the other end of the switching regulator unit 13 and then grounded.
Wherein the switching regulating unit 13 comprises a switch SW3, a switch SW4 and a capacitor Cd 5;
one end of the switch SW3 is connected with one end of the resonant capacitor Cd3, one end of the switch SW2 and the other end of the inductor L1 respectively, and the other end of the switch SW3 is connected with one end of the switch SW4 and one end of the capacitor Cd5 respectively;
the other end of the switch SW4 is connected to the other end of the capacitor Cd5 and the other end of the resonant inductor Ld2, respectively, and then grounded.
The switch SW2, the switch SW3 and the switch SW4 can be mechanical switches, the mechanical switches have good isolation, and a control circuit does not need to be additionally arranged, so that the effect of simplifying the circuit is achieved. The switches SW2, SW3 and SW4 may also be electronic switches, such as touch switches, inductive switches, etc. The values of the resonant capacitor Cd3, the resonant inductor Ld2, the capacitor Cd4 and the capacitor Cd5 are mutually influenced, and the value of the resonant capacitor Cd3 serving as a matching capacitor can be changed through the capacitor Cd4 and the capacitor Cd5, so that the value of the resonant inductor Ld2 is correspondingly influenced.
The following explains the operation principle of the circuit of the present embodiment:
the Cd3 is connected in series in the receiving coil to be used as a resonant capacitor and a matching capacitor; when switch SW3 is open, the trap circuit is not active.
When the switch sw2, the switch sw3 and the switch sw4 are closed, the current of the direct current power supply 11 is limited by the current limiting resistor R1 and then supplied to the inductor L1; the current is supplied to the resonant unit 12 and the switching regulator unit 13 through the inductor L1 to form a resonant tank. In forming a resonance circuit with respect to the resonance unit 12 and the switching adjustment unit 13, the resonance capacitor Cd3 and the capacitor Cd4 form a parallel relationship; because the switch sw3 and the switch sw4 are closed, the capacitor Cd5 is short-circuited, the capacitance of the resonant circuit is increased, the resonant capacitor Cd3 and the capacitor Cd4 are connected in parallel and then form a series resonant circuit together with the resonant inductor Ld2, and at the moment, the trap circuit starts to work, so that the coil where the trap circuit is located is in a detuned state.
When the switch sw3 is closed, the switch sw4 is closed and the switch sw2 is opened, the current of the direct current power supply 11 is limited by the current limiting resistor R1 and then is supplied to the inductor L1; the current is supplied to the resonant unit 12 and the switching regulator unit 13 through the inductor L1 to form a resonant tank. In the resonant circuit formed with respect to the resonant unit 12 and the switching adjustment unit 13, the resonant capacitor Cd3 and the resonant inductor Ld2 form a series resonant circuit, and at this time, the trap circuit starts to operate, so that the coil in which the trap circuit is located is in a detuned state.
When the switch sw3 is closed, the switch sw2 is closed and the switch sw4 is opened, the current of the direct current power supply 11 is limited by the current limiting resistor R1 and then is supplied to the inductor L1; the current is supplied to the resonant unit 12 and the switching regulator unit 13 through the inductor L1 to form a resonant tank. In forming a resonant tank with respect to the resonant unit 12 and the switching regulator unit 13,
a parallel relation is formed between a resonant capacitor Cd3 and a capacitor Cd4, a series relation is formed between a combination of the resonant capacitor Cd3 and a capacitor Cd4 and a capacitor Cd5, a series resonant circuit is formed by a capacitance combination of the resonant capacitor Cd3, a capacitor Cd4 and a capacitor Cd5 and an inductor Ld2, and at the moment, the trap circuit starts to work, so that a coil where the trap circuit is located is in a detuned state.
By means of the switching mode among the switches, the resonant capacitor in the resonant unit 12 is changed to serve as the value of the matching capacitor, and therefore the selection of the trap loop can be diversified.
In some embodiments, the dc power supply 11 is a built-in dc power supply or an external dc power supply.
Specifically, the external dc power supply is a dc power supply for external power supply, and may be a power supply for an external receiving coil, and in order to match the usage requirement of the trap circuit, the conversion circuit may be required to convert the dc power supply for external power supply and then use the external dc power supply for power supply.
In some of these embodiments, the inductor L1 is an rf choke inductor in order to isolate the rf path from the dc path. The value of the inductance L1 is related to the frequency in the practical application scenario, and the inductance L1 may be 2.7-10 differential. Generally, the lower the frequency in the actual application scene, the higher the value thereof; the higher the frequency in the actual application scenario, the lower its value. I.e. the value of the inductance L1 is inversely proportional to the frequency in the actual application scenario. Such as: the frequency in an actual application scene is 300 Hz, and the value of the inductance L1 is 2.7 differential; in a practical application scenario, the frequency is 56 hz, and the value of the inductance L1 is 10 differential. In other embodiments, the value of the inductance L1 is not limited.
In some embodiments, in combination with the trap circuit in the above embodiments, the present application may provide a receiving coil to implement. The receiver coil includes any of the trap circuits described in the above embodiments. Such as: the trap circuit comprises a resistor R1, an inductor L1, a resonant unit 12 and a switch adjusting unit 13; one end of the resistor R1 is connected with the positive electrode of the direct-current power supply, and the other end of the resistor R1 is connected with one end of the inductor L1; the other end of the inductor L1 is connected to one end of the resonance unit 12 and one end of the switching adjustment unit 13, respectively; the other end of the resonance unit 12 and the other end of the switching adjustment unit 13 are grounded; the resonance unit 12 and the switch adjusting unit 13 form a resonance circuit, and the overall capacitance of the resonance circuit is correspondingly adjusted by adjusting the on-off state of the switch adjusting unit. When the resonance unit 12 and the switching adjustment unit 13 in the trap circuit form a resonance circuit, the receiving coil is in a detuned state. The form of other trap circuits in the receiving coil is not exemplified here.
According to the trap circuit in the receiving coil, the integral capacitance of the resonance loop is correspondingly adjusted through the on-off state of the switch adjusting unit 13, so that the problem that the value of the combination of the resonance capacitance and the resonance inductance is limited by the heating of the resonance inductance, and the limitation of the value of the combination of the resonance capacitance and the resonance inductance exists is solved; the value range of the combination of the resonant capacitor and the resonant inductor is increased, and the heating of the resonant inductor can be reduced.
In addition, in combination with the trap circuit in the above embodiments, the embodiments of the present application may be implemented by providing a magnetic resonance imaging system. The magnetic resonance imaging system comprises the trap circuit of any one of the above embodiments. Such as: the trap circuit comprises a resistor R1, an inductor L1, a resonance unit and a switch adjusting unit; one end of the resistor R1 is connected with the positive electrode of the direct-current power supply, and the other end of the resistor R1 is connected with one end of the inductor L1; the other end of the inductor L1 is respectively connected with one end of the resonance unit and one end of the switch adjusting unit; the other end of the resonance unit and the other end of the switch adjusting unit are grounded; the resonance unit and the switch adjusting unit form a resonance loop, and the integral capacitance of the resonance loop is correspondingly adjusted by adjusting the on-off state of the switch adjusting unit. When the resonance unit and the switching regulating unit in the trap circuit form a resonance loop, a receiving coil in the magnetic resonance imaging system is in a detuned state. The form of other trap circuits in the magnetic resonance imaging system is not exemplified here.
According to the trap circuit in the magnetic resonance imaging system, the integral capacitance of the resonance loop is correspondingly adjusted through the on-off state of the switch adjusting unit, so that the problems that the combined value of the resonance capacitance and the resonance inductance is limited by the heating of the resonance inductance, and the combined value of the resonance capacitance and the resonance inductance is limited are solved; the value range of the combination of the resonant capacitor and the resonant inductor is increased, and the heating of the resonant inductor can be reduced.
The features of the above-described embodiments may be arbitrarily combined, and for the sake of brevity, all possible combinations of the features in the above-described embodiments are not described, but should be construed as being within the scope of the present disclosure as long as there is no contradiction between the combinations of the features.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that suitable changes and modifications of the above embodiments are within the scope of the claimed invention as long as they are within the spirit and scope of the present invention.
Claims (10)
1. The trap circuit is characterized by comprising a resistor R1, an inductor L1, a resonant unit and a switch adjusting unit;
one end of the resistor R1 is connected with the positive electrode of a direct current power supply, and the other end of the resistor R1 is connected with one end of the inductor L1;
the other end of the inductor L1 is connected to one end of the resonance unit and one end of the switching adjustment unit, respectively;
the other end of the resonance unit and the other end of the switch adjusting unit are grounded;
the resonance unit and the switch adjusting unit form a resonance loop, and the integral capacitance of the resonance loop is correspondingly adjusted by adjusting the on-off state of the switch adjusting unit.
2. The trap circuit of claim 1, wherein the resonant cell comprises a resonant capacitor Cd1 and a resonant inductor Ld 1;
one end of the resonant capacitor Cd1 is connected to the other end of the inductor L1 and one end of the switching regulator unit, respectively, and the other end of the resonant capacitor Cd1 is connected to one end of the resonant inductor Ld 1;
the other end of the resonant inductor Ld1 is connected to the other end of the switching regulator unit and then grounded.
3. The trap circuit of claim 2, wherein the switching adjustment unit comprises a switch SW1 and a capacitor Cd 2;
one end of the switch SW1 is connected to the other end of the inductor L1 and one end of the resonant capacitor Cd1, respectively, and the other end of the switch SW1 is connected to one end of the capacitor Cd 2;
the other end of the capacitor Cd2 is connected to the other end of the resonant inductor Ld1 and then grounded.
4. The trap circuit of claim 3, wherein the switch SW1 is a mechanical switch.
5. The trap circuit of claim 1, wherein the resonant unit comprises a resonant capacitor Cd3, a resonant inductor Ld2, a switch SW2, and a capacitor Cd 4;
one end of the resonant capacitor Cd3 is connected to one end of the switch SW2, one end of the switch adjusting unit, and the other end of the inductor L1, respectively, and the other end of the resonant capacitor Cd3 is connected to the other end of the capacitor Cd4 and one end of the resonant inductor Ld2, respectively;
the other end of the switch SW2 is connected with one end of the capacitor Cd 4;
the other end of the resonant inductor Ld2 is connected to the other end of the switching regulator unit and then grounded.
6. The trap circuit of claim 5, wherein the switching adjustment unit comprises a switch SW3, a switch SW4, and a capacitor Cd 5;
one end of the switch SW3 is connected to one end of the resonant capacitor Cd3, one end of the switch SW2 and the other end of the inductor L1, respectively, and the other end of the switch SW3 is connected to one end of the switch SW4 and one end of the capacitor Cd5, respectively;
the other end of the switch SW4 is connected to the other end of the capacitor Cd5 and the other end of the resonant inductor Ld2, and then grounded.
7. The trap circuit of any of claims 1-6, wherein the DC power supply is a built-in DC power supply or an external DC power supply.
8. The trap circuit of claim 7, wherein the inductor L1 is a radio frequency choke inductor.
9. A receiver coil comprising the trap circuit of any of claims 1-8;
the receiving coil is in a detuned state when a resonance unit and a switching adjusting unit in the trap circuit form a resonance loop.
10. A magnetic resonance imaging system comprising a trap circuit according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122497544.1U CN216209816U (en) | 2021-10-15 | 2021-10-15 | Trap circuit, receiving coil and magnetic resonance imaging system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122497544.1U CN216209816U (en) | 2021-10-15 | 2021-10-15 | Trap circuit, receiving coil and magnetic resonance imaging system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216209816U true CN216209816U (en) | 2022-04-05 |
Family
ID=80884324
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122497544.1U Active CN216209816U (en) | 2021-10-15 | 2021-10-15 | Trap circuit, receiving coil and magnetic resonance imaging system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216209816U (en) |
-
2021
- 2021-10-15 CN CN202122497544.1U patent/CN216209816U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Lee et al. | A reconfigurable resonant coil for range adaptation wireless power transfer | |
| Zhang et al. | Distance-insensitive wireless power transfer using mixed electric and magnetic coupling for frequency splitting suppression | |
| CN108512315B (en) | Injection type wireless energy and information synchronous transmission circuit based on bilateral LCC structure | |
| EP3391539B1 (en) | Class e2 amplifier | |
| Awai | Basic characteristics of “Magnetic resonance” wireless power transfer system excited by a 0 ohm power source | |
| CN107749772B (en) | Wireless energy information synchronous transmission system | |
| EP2926156A1 (en) | Transmit/receive switching circuitry with improved radio frequency isolation | |
| Lee et al. | Impedance transformers for compact and robust coupled magnetic resonance systems | |
| Costanzo et al. | Rigorous network modeling of magnetic-resonant wireless power transfer | |
| US20170123024A1 (en) | Body coil and magnetic resonance imaging system | |
| Phinney et al. | Filters with active tuning for power applications | |
| Machnoor et al. | Wireless telemetry system with independent power and data frequency resonance | |
| Wang et al. | Dual-functional wireless power transfer and data communication design for micromedical implants | |
| CN216209816U (en) | Trap circuit, receiving coil and magnetic resonance imaging system | |
| Na et al. | An improved wireless power transfer system with adaptive technique for implantable biomedical devices | |
| EP3713088A1 (en) | Inductive sensing arrangement | |
| CN112531922B (en) | Information feedback system based on space scale-time symmetric circuit | |
| Zhang et al. | Multiple objective-based optimal energy distribution for wireless power transfer | |
| Carobolante et al. | A novel charger architecture for resonant wireless power transfer | |
| Zhou et al. | Simultaneous wireless power and data transmission based on unsymmetrical current waveforms with duty cycle modulation | |
| CN216285675U (en) | Matching circuit of receiving coil, low-temperature probe and magnetic resonance device | |
| CN216090475U (en) | Tuning device for receiving coil, low-temperature probe and magnetic resonance device | |
| CN113075600A (en) | Nuclear magnetic resonance radio frequency probe circuit and nuclear magnetic resonance radio frequency probe energy discharge method | |
| Machnoor et al. | Rectifier design for highly loaded inductive wireless power transfer systems for biomedical applications | |
| Costanzo et al. | Design of magnetic-resonant wireless power transfer links realized with two coils: comparison of solutions |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |