CN219980796U - Isolation circuit and electronic device - Google Patents
Isolation circuit and electronic device Download PDFInfo
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- CN219980796U CN219980796U CN202320810987.8U CN202320810987U CN219980796U CN 219980796 U CN219980796 U CN 219980796U CN 202320810987 U CN202320810987 U CN 202320810987U CN 219980796 U CN219980796 U CN 219980796U
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- 238000002955 isolation Methods 0.000 title claims abstract description 39
- 238000010521 absorption reaction Methods 0.000 claims abstract description 25
- 239000003990 capacitor Substances 0.000 claims description 20
- 230000003750 conditioning effect Effects 0.000 claims description 16
- 230000001052 transient effect Effects 0.000 claims description 11
- 230000001629 suppression Effects 0.000 claims description 10
- 230000003068 static effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 10
- 238000001514 detection method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
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- 230000005670 electromagnetic radiation Effects 0.000 description 1
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Abstract
The present utility model relates to the field of electronic devices, and in particular, to an isolation circuit and an electronic device. The isolation circuit is connected between the radio frequency channel and the electromagnetic wave absorption ratio sensor and comprises a first inductor, a signal adjusting unit and a resonance adjusting unit; the first end of the first inductor is connected with the radio frequency channel, the second end of the first inductor is respectively connected with the first end of the signal adjusting unit and the resonance adjusting unit, and the second end of the signal adjusting unit is connected with the electromagnetic wave absorption ratio sensor. The utility model adopting the scheme can improve the convenience of the electronic equipment in use.
Description
Technical Field
The present utility model relates to the field of electronic devices, and in particular, to an isolation circuit and an electronic device.
Background
With the evolution of wireless communication electronic devices, the influence of electromagnetic radiation generated during the use of the electronic devices on human health is also receiving public attention. In the related art, an isolation circuit may be connected between a radio frequency channel corresponding to an antenna and an electromagnetic wave absorption ratio (Specific Absorption Rate, SAR) sensor to transmit an SAR signal of the antenna to the SAR sensor, thereby completing the detection of the SAR of the antenna. However, the inductance used in the isolation circuit may generate self-resonance, affect the resonance frequency of the antenna itself, and reduce the performance of the antenna, so that the convenience of the electronic device in use is low.
Disclosure of Invention
The utility model provides an isolation circuit and electronic equipment, and mainly aims to improve the convenience of the electronic equipment in use.
According to an aspect of the present utility model, there is provided an isolation circuit connected between a radio frequency path and an electromagnetic wave absorption ratio sensor, the isolation circuit including a first inductance, a signal conditioning unit, and a resonance conditioning unit; wherein,
the first end of the first inductor is connected with the radio frequency channel, the second end of the first inductor is respectively connected with the first end of the signal adjusting unit and the resonance adjusting unit, and the second end of the signal adjusting unit is connected with the electromagnetic wave absorption ratio sensor.
Optionally, in one embodiment of the utility model, the resonance adjusting unit comprises a capacitor; wherein,
the first end of the capacitor is respectively connected with the second end of the first inductor and the first end of the signal adjusting unit, and the second end of the capacitor is grounded.
Optionally, in an embodiment of the present utility model, the inductance value of the first inductor is not less than 50nH, the resistance value corresponding to the signal adjusting unit is lower than a resistance threshold, and the capacitance value corresponding to the capacitor is not less than 1pF.
Optionally, in an embodiment of the present utility model, a capacitance value corresponding to the capacitor is not less than 2pF.
Optionally, in one embodiment of the present utility model, the signal conditioning unit includes a second inductor; wherein,
the first end of the second inductor is connected with the second end of the first inductor and the resonance adjusting unit respectively, and the second end of the second inductor is connected with the electromagnetic wave absorption ratio sensor.
Optionally, in one embodiment of the present utility model, the isolation circuit further includes an electrostatic protection unit; wherein,
the static protection unit is respectively connected with the second end of the first inductor, the first end of the resonance adjusting unit and the first end of the signal adjusting unit.
Optionally, in one embodiment of the utility model, the electrostatic protection unit comprises a transient voltage suppression diode; wherein,
the first end of the transient voltage suppression diode is respectively connected with the second end of the first inductor, the first end of the resonance adjusting unit and the first end of the signal adjusting unit, and the second end of the transient voltage suppression diode is grounded.
According to another aspect of the present utility model, there is provided an electronic apparatus including: a radio frequency path, an electromagnetic wave absorption ratio sensor, and an isolation circuit as in any of the preceding aspects, wherein,
the isolation circuit is connected between the radio frequency path and the electromagnetic wave absorption ratio sensor.
Optionally, in one embodiment of the present utility model, the electronic device further includes an antenna and an antenna signal transceiver module; wherein,
the radio frequency path is a radio frequency path between the antenna and the antenna signal transceiver module.
In summary, in one or more embodiments of the present utility model, an isolation circuit is connected between a radio frequency path and an electromagnetic wave absorption ratio sensor, and the isolation circuit includes a first inductor, a signal adjusting unit, and a resonance adjusting unit; the first end of the first inductor is connected with the radio frequency channel, the second end of the first inductor is respectively connected with the first end of the signal adjusting unit and the resonance adjusting unit, and the second end of the signal adjusting unit is connected with the electromagnetic wave absorption ratio sensor. Therefore, resonance generated by the first inductor is adjusted by the resonance adjusting unit, the influence of the first inductor on the antenna performance and efficiency can be reduced, and the convenience of the electronic equipment in use can be improved.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The foregoing and/or additional aspects and advantages of the utility model will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of an isolation circuit according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of another isolation circuit according to an embodiment of the present utility model;
FIG. 3 is a schematic diagram of an isolation circuit according to another embodiment of the present utility model;
FIG. 4 is a schematic waveform diagram of an inductance self-resonance according to an embodiment of the present utility model;
fig. 5 is a waveform diagram of resonance adjustment according to an embodiment of the present utility model.
Reference numerals illustrate: the first inductor L1, the second inductor L2, the transient voltage suppression diode TVS, and the capacitor Cp.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model. On the contrary, the embodiments of the utility model include all alternatives, modifications and equivalents as may be included within the spirit and scope of the appended claims.
The present utility model will be described in detail with reference to specific examples.
Fig. 1 is a schematic structural diagram of an isolation circuit according to an embodiment of the present utility model.
As shown in fig. 1, an isolation circuit is connected between a radio frequency path and an electromagnetic wave absorption ratio (Specific Absorption Rate, SAR) sensor, and the isolation circuit comprises a first inductor L1, a signal conditioning unit and a resonance conditioning unit; wherein,
the first end of the first inductor L1 is connected with the radio frequency channel, the second end of the first inductor L1 is respectively connected with the first end of the signal adjusting unit and the resonance adjusting unit, and the second end of the signal adjusting unit is connected with the electromagnetic wave absorption ratio sensor.
According to some embodiments, as shown in fig. 1, the radio frequency path is a radio frequency path between an antenna and an antenna signal transceiver module in an electronic device. The antenna signal transceiver module may output a radio frequency signal (RF signal) to the antenna.
According to some embodiments, the SAR sensor may automatically detect if a human body is near the antenna within a certain range from the antenna. The human body belongs to a semiconductor, when the human body is close to the antenna (metal), the capacitance value sensed by the antenna changes, and the SAR sensor can detect the approaching degree of the human body by detecting the capacitance change of the antenna.
In some embodiments, the frequency of the SAR detection signal is relatively low, such as often between tens of KHz and hundreds of KHz, while the frequency of the communication signal on the radio frequency path between the antenna and the antenna signal transceiver module is often as high as between hundreds of MHz and several GHz, and is relatively high in power. By arranging the isolation circuit in front of the detection port of the SAR sensor, the influence of the high-frequency communication signal on the antenna on SAR detection can be isolated through the blocking effect of the inductor on the high-frequency signal, and the SAR signal on the antenna is transmitted.
According to some embodiments, the first inductor L1 is used to block the current of the antenna operating band, and the first inductor L1 is equivalent to an open circuit. Therefore, the first inductance L1 adopts a large inductance, that is, the inductance value of the first inductance L1 is not less than 50nH. Alternatively, the inductance value of the first inductor L1 may range from 75nH to 150nH.
In some embodiments, the inductance and capacitance (InductorCapacitance, LC) inside the first inductor L1 itself will generate self-resonance, and its resonance frequency will affect the resonance frequency of the antenna itself, resulting in reduced antenna performance. Therefore, the resonance adjusting unit is arranged to adjust the resonance generated by the first inductor L1, so that the influence of the first inductor L1 on the antenna performance and efficiency can be reduced.
According to some embodiments, the signal conditioning unit is configured to adjust an inductance value between the radio frequency path and the electromagnetic wave absorption ratio sensor to adjust a frequency of the SAR signal input to the SAR sensor. The signal conditioning unit includes, but is not limited to, an inductor, a resistor, and the like.
Optionally, in an embodiment of the present utility model, fig. 2 is a schematic structural diagram of an isolation circuit according to an embodiment of the present utility model. As shown in fig. 2, the isolation circuit further includes an electrostatic protection unit; wherein,
the electrostatic protection unit is respectively connected with the second end of the first inductor, the first end of the resonance adjusting unit and the first end of the signal adjusting unit.
According to some embodiments, the electrostatic protection unit is configured to protect the active switch and the SAR sensor of the antenna from being damaged by Static electricity, so as to implement electrostatic discharge (ESD) protection, which may improve the safety of the electronic device in use.
In some embodiments, fig. 3 is a schematic structural diagram of an isolation circuit according to an embodiment of the utility model. As shown in fig. 3, the electrostatic protection unit includes a transient voltage suppression diode (Transient Voltage Suppressor, TVS); wherein,
the first end of the transient voltage suppression diode TVS is respectively connected with the second end of the first inductor, the first end of the resonance adjusting unit and the first end of the signal adjusting unit, and the second end of the transient voltage suppression diode TVS is grounded.
Alternatively, in one embodiment of the present utility model, as shown in fig. 3, the signal conditioning unit includes a second inductance L2; wherein,
the first end of the second inductor L2 is respectively connected with the second end of the first inductor L1 and the resonance adjusting unit, and the second end of the second inductor L2 is connected with the electromagnetic wave absorption ratio sensor.
According to some embodiments, the inductance value of the second inductor L2 may be selected according to the antenna requirements.
Alternatively, in one embodiment of the present utility model, as shown in fig. 3, the resonance adjusting unit includes a capacitance Cp; wherein,
the first end of the capacitor Cp is respectively connected with the second end of the first inductor L1 and the first end of the signal adjusting unit, and the second end of the capacitor Cp is grounded.
Fig. 4 is a schematic waveform diagram of an inductance self-resonance according to an embodiment of the present utility model. As shown in fig. 4, the resistance value of the signal conditioning unit is set to NM, that is, no device is provided in the signal conditioning unit, and the signal conditioning unit is equivalent to a wire, that is, the resistance value of the signal conditioning unit is lower than the resistance threshold, at this time, fig. 4 shows self-resonance of different frequencies generated when the inductance value of the first inductor L1 takes 75nH, 100nH, 150nH, respectively.
The larger the inductance value of the first inductor L1 is, the larger the equivalent resistance is, and the worse the effect is for ESD protection, but at the same time, the larger the inductance value of the first inductor L1 is, the closer to an open circuit, and the smaller the performance loss of the antenna is, which contradicts each other, so that the inductance value of the first inductor L1 is 100nH for compatibility of the antenna performance and ESD protection. However, when the inductance value of the first inductor L1 is 100nH, the LC of the first inductor L1 itself will generate self-resonance, and the resonance frequency is close to B28, which affects the resonance frequency of the antenna itself, and the antenna performance will be greatly reduced.
In some embodiments, when the resistance value corresponding to the signal conditioning unit is lower than the resistance threshold, the resistance value corresponding to the signal conditioning unit is approximately zero. The resistance threshold may be, for example, 0.01 ohm, 0.005 ohm, etc.
According to some embodiments, when the inductance value of the first inductor L1 is 100nH and the resistance value of the corresponding resistor of the signal adjusting unit, that is, the second inductor L2, is 0, the capacitance value of the capacitor Cp is not less than 1pF, so as to adjust the resonance generated by the first inductor. Fig. 5 is a waveform diagram of resonance adjustment according to an embodiment of the present utility model. As shown in fig. 5, when the capacitance of the capacitor Cp takes 2pF, the noise is lower than 500MHz. Meanwhile, increasing the capacitance of the capacitor Cp may further decrease the clutter frequency, and thus, the capacitance corresponding to the capacitor Cp may be not less than 2pF.
In some embodiments, when the capacitance value of the capacitor Cp increases to 5pF, the effect of the first inductance L1 on the antenna efficiency is lower, and the antenna efficiency is increased by 1.1dB compared to when the capacitor Cp is not used, and at this time, if the capacitance value of the capacitor Cp is continuously added, the antenna efficiency is not continuously increased, and thus, the capacitance value of the capacitor Cp may be not less than 5pF.
In summary, the isolation circuit provided by the embodiment of the utility model is connected between a radio frequency channel and an electromagnetic wave absorption ratio sensor, and comprises a first inductor, a signal adjusting unit and a resonance adjusting unit; the first end of the first inductor is connected with the radio frequency channel, the second end of the first inductor is respectively connected with the first end of the signal adjusting unit and the resonance adjusting unit, and the second end of the signal adjusting unit is connected with the electromagnetic wave absorption ratio sensor. Therefore, resonance generated by the first inductor is adjusted by the resonance adjusting unit, the influence of the first inductor on the antenna performance and efficiency can be reduced, and the convenience of the electronic equipment in use can be improved.
The utility model also provides electronic equipment.
Specifically, the electronic device includes: a radio frequency path, an electromagnetic wave absorption ratio sensor, and an isolation circuit as in any of the previous embodiments, wherein,
the isolation circuit is connected between the radio frequency path and the electromagnetic wave absorption ratio sensor.
According to some embodiments, the electronic device further comprises an antenna and an antenna signal transceiver module; wherein,
the radio frequency path is the radio frequency path between the antenna and the antenna signal transceiver module.
In summary, in the electronic device provided by the embodiment of the utility model, the resonance generated by the first inductor in the isolation circuit is regulated by arranging the resonance regulating unit in the isolation circuit, so that the influence of the first inductor on the antenna performance and efficiency can be reduced, and the convenience in use of the electronic device can be improved.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms may be directed to different embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.
Claims (9)
1. An isolation circuit is characterized by being connected between a radio frequency channel and an electromagnetic wave absorption ratio sensor, and comprises a first inductor, a signal adjusting unit and a resonance adjusting unit; wherein,
the first end of the first inductor is connected with the radio frequency channel, the second end of the first inductor is respectively connected with the first end of the signal adjusting unit and the resonance adjusting unit, and the second end of the signal adjusting unit is connected with the electromagnetic wave absorption ratio sensor.
2. The isolation circuit of claim 1, wherein the resonance adjustment unit comprises a capacitor; wherein,
the first end of the capacitor is respectively connected with the second end of the first inductor and the first end of the signal adjusting unit, and the second end of the capacitor is grounded.
3. The isolation circuit of claim 2, wherein the inductance of the first inductor is not less than 50nH, the resistance of the signal conditioning unit is lower than a resistance threshold, and the capacitance of the capacitor is not less than 1pF.
4. An isolation circuit according to claim 3, wherein the capacitance corresponds to a capacitance of not less than 2pF.
5. The isolation circuit of claim 2, wherein the signal conditioning unit comprises a second inductance; wherein,
the first end of the second inductor is connected with the second end of the first inductor and the resonance adjusting unit respectively, and the second end of the second inductor is connected with the electromagnetic wave absorption ratio sensor.
6. The isolation circuit of claim 1, further comprising an electrostatic protection unit; wherein,
the static protection unit is respectively connected with the second end of the first inductor, the first end of the resonance adjusting unit and the first end of the signal adjusting unit.
7. The isolation circuit of claim 6, wherein the electrostatic protection unit comprises a transient voltage suppression diode; wherein,
the first end of the transient voltage suppression diode is respectively connected with the second end of the first inductor, the first end of the resonance adjusting unit and the first end of the signal adjusting unit, and the second end of the transient voltage suppression diode is grounded.
8. An electronic device, comprising: radio frequency path, electromagnetic wave absorption ratio sensor and isolation circuit as claimed in any one of claims 1 to 7, wherein,
the isolation circuit is connected between the radio frequency path and the electromagnetic wave absorption ratio sensor.
9. The electronic device of claim 8, further comprising an antenna and an antenna signal transceiver module; wherein,
the radio frequency path is a radio frequency path between the antenna and the antenna signal transceiver module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320810987.8U CN219980796U (en) | 2023-04-12 | 2023-04-12 | Isolation circuit and electronic device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320810987.8U CN219980796U (en) | 2023-04-12 | 2023-04-12 | Isolation circuit and electronic device |
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| CN219980796U true CN219980796U (en) | 2023-11-07 |
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| CN202320810987.8U Active CN219980796U (en) | 2023-04-12 | 2023-04-12 | Isolation circuit and electronic device |
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| CN (1) | CN219980796U (en) |
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