CN113783578A - Communication module of MR glasses under complicated electromagnetic environment - Google Patents
Communication module of MR glasses under complicated electromagnetic environment Download PDFInfo
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- 230000005540 biological transmission Effects 0.000 abstract description 18
- 238000007600 charging Methods 0.000 abstract description 5
- 238000007599 discharging Methods 0.000 abstract description 5
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B2027/0178—Eyeglass type
Abstract
The application relates to a communication module of MR glasses under a complex electromagnetic environment, and the system comprises a signal conversion circuit, a wireless transmission circuit and a power supply driving circuit which are connected in sequence. The signal conversion circuit carries out charging and discharging and monitoring on the circuit through the processing of voltage stabilization and voltage division of signals, and converts video signals of VGA standard into CVBS standard; the wireless transmitting circuit converts the signal into the original electric signal by the analog information source, then carries out the reverse conversion in the channel, the baseband signal is converted into the signal suitable for being transmitted in the channel by the modulator at the transmitting end, and then carries out the reverse conversion by the demodulator at the receiving end. The scheme ensures the quick response capability and the steady-state performance of the MR glasses communication module circuit, meets the design requirements of intelligence, small size, high transmission rate, high performance and strong anti-interference capability, and has very important significance for improving the economic benefit and the working efficiency of production enterprises.
Description
Technical Field
This application is related to signal communication and MR field, concretely relates to communication module of MR glasses under complicated electromagnetic environment.
Background
The MR glasses are visual sensing devices using virtual reality display technology, which generate a three-dimensional space for human interaction by means of computer and sensor technologies. The new visualization environment created by combining real and virtual worlds, virtual physical and real objects are difficult to distinguish. The physical and digital objects coexist in the new visual environment and interact in real time, so that the user can obtain the experience of being personally on the scene such as vision, hearing, touch and the like. MR transmission has requirements of ultra-high bandwidth and low latency, and at the same time, the generation of MR content also requires encoding and decoding of a large amount of data, so MR transmission has high requirements on communication resources. Since 2016, the domestic MR glasses market has just started to develop, and researchers at home and abroad mainly focus on reducing the energy consumption of mobile equipment and ensuring stable communication by using a mobile edge computing MEC architecture. Although the current MEC architecture can solve the problem of insufficient computing power of the mobile MR device to a certain extent, the increase rate of the mobile MR content data far exceeds the increase rate of the wireless network capacity, and the MR video transmission using the current MEC architecture brings huge communication load. Therefore, the MR glasses communication module under the complex electromagnetic environment is designed by minimizing the consumption of communication data volume through a reasonable scheduling strategy.
As shown in fig. 1, the video signal conversion circuit in the prior art has a simple structure and is easy to integrate, but only uses two stages of amplification circuits, and cannot transmit video signals in segments, so that the signal computation amount is large, and the transmission efficiency is low.
As shown in fig. 2, a wireless signal transmitting circuit in the prior art adopts a mode of encoding before transmitting, and the transmission can be started only after the signals are completely compiled, so that the transmission of the designated segment signals is difficult to achieve, the signal transmission amount is large, and the efficiency is low.
Disclosure of Invention
Problem (A)
1. The communication module in the prior art has the advantages of simple signal transmission mode, large calculated amount and low transmission efficiency.
2. The communication module in the prior art has large transmission quantity and poor directional transmission performance of signal sections during signal transmission.
(II) technical scheme
In view of the above technical problems, the present application provides a communication module for MR glasses in a complex electromagnetic environment, where the system includes a signal conversion circuit, a wireless transmission circuit, and a power driving circuit, which are connected in sequence.
The signal conversion circuit: through the treatment of voltage-stabilizing and voltage-dividing of signal, charging and discharging and monitoring circuit, video signal of VGA standard is converted into CVBS standard, in the circuit, triode Q9 and triode Q8, triode Q11 and triode Q10 form a differential circuit, voltage is taken from the base electrode of triode Q9, signal is added to the base electrode of Q10 through resistor R9, when the signal amplitude is small, the base electrode voltage of triode Q10 is high, triode Q10 is in saturation state, triode Q11 is in cut-off state, the high level of the collector electrode of triode Q11 is added to the base electrode of triode Q8, triode Q8 is in saturation state, leading triode Q9 to be cut off, the collector electrode of triode Q9 is high level, at this moment, the operational amplifier gain is maximized, the signal processing effect is good, the collector electrode of triode Q11 and triode Q10 is provided with pull-up level through capacitor C1 and resistor R5, diode D1 plays the role of unidirectional signal conduction, the resistor R2 and the resistor R4 provide partial voltage for the base electrode of the triode Q2, the triode Q15, the triode Q16, the triode Q18 and the triode Q17 ensure that the voltage meets the requirement, and the capacitor C2 ensures that the output voltage is stable and effective.
The wireless transmission circuit: the signal is converted into an original electric signal, then reverse conversion is carried out on a channel, a baseband signal is converted into a signal suitable for being transmitted in the channel through a modulator at a transmitting end, then reverse conversion is carried out through a demodulator at a receiving end, the signal input from the front stage is input through an emitter of a triode Q4, the signal outside a frequency band is removed through a base of a triode Q3, the anti-interference performance of the input signal is improved, the signal is input into a collector of a triode Q12 after passing through a resistor R7, a high-frequency tuning loop is formed through a capacitor C4 and a resistor R10, diodes D2, D3 and D4 prevent an overvoltage damage circuit, the triode Q7 plays an amplification effect on the signal, the high-frequency signal is transmitted through the triodes Q5 and Q6 to transmit a wireless signal, oscillation filtering is carried out on the signal through the resistors R3 and C5 to eliminate harmonic influence and prevent the situations of short circuit, overload and the like.
The power supply driving circuit: the circuit is safe by monitoring the characteristic that signals flow through a control power electronic device, controlling the charging and discharging and output actions of the circuit and ensuring the unidirectional circulation of the signals through a clamping diode D5, wherein a resistance-capacitance absorption circuit consisting of a capacitor C7, a resistor R16, a resistor R20 and a capacitor C10 ensures the safety of the circuit, the signals are input into an amplifier U3 through a field effect transistor Q19 and an inductor L2, the signals are amplified for the first stage through an amplifier U3, the resistor R12, the capacitor C6 and the inductor L1 play a role in protecting electronic elements, the circuit is ensured to stably provide electric energy for a wireless transmitting module through the amplifier U2 and the amplifier U1, the normal driving of an external circuit is ensured through the resistors R17 and the R19, and a reasonable scheduling strategy ensures that the communication module of the MR glasses can minimize the consumption of communication data volume.
(III) advantageous effects
The utility model provides a communication module of MR glasses under complicated electromagnetic environment, the signal passes through signal conversion circuit, wireless transmitting circuit and power drive circuit's processing, communication module's robustness has been improved, MR glasses communication module circuit's quick response ability and stable state performance have been guaranteed, the design requirement that intellectuality, miniaturization, high transmission rate, high performance, the interference killing feature is strong has very important meaning to the economic benefits and the work efficiency that improve manufacturing enterprise.
Drawings
Fig. 1 is a prior art video signal conversion circuit.
Fig. 2 is a prior art wireless signal transmitting circuit.
Fig. 3 is a schematic diagram of a signal conversion circuit according to the present application.
Fig. 4 is a schematic diagram of a wireless transmission circuit according to the present application.
Fig. 5 is a schematic diagram of a power driving circuit according to the present application.
Detailed Description
The present invention will be further described with reference to the following examples.
As shown in fig. 3, 4 and 5, the system for the communication module of MR glasses under complex electromagnetic environment provided by the present application includes a signal conversion circuit, a wireless transmission circuit and a power driving circuit, which are connected in sequence.
Specifically, the signal conversion circuit includes an input port Vin, diodes D1, 7 transistors Q2, Q8, Q9, Q15, Q16, Q13, Q18, and 4 resistors R1, R2, R4, and R11, in which the input port Vin is connected to a base of the transistor Q9, a collector of the transistor Q9 is connected to a collector of the transistor Q2, an emitter of the transistor Q2 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to a high level VCC, a base of the transistor Q2 is connected to one end of the resistor R2 and one end of the resistor R4, the other end of the resistor R2 is connected to a cathode of the diode D1, the other end of the resistor R4 is connected to a collector of the transistor Q8, an anode of the diode D1 is connected to the high level VCC, an emitter of the transistor Q8 is connected to an emitter of the transistor Q9, a collector of the transistor Q15, a collector of the transistor Q16, and a collector of the transistor Q13, the base electrode of the triode Q15 is respectively connected with the base electrode of the triode Q16 and the base electrode of the triode Q18, the emitter electrode of the triode Q15 is connected with one end of the resistor R11 and the collector electrode of the triode Q18, and the other end of the resistor R11 is respectively connected with the emitter electrode of the triode Q16 and the emitter electrode of the triode Q13. The signal conversion circuit comprises an output port Va, 3 triodes Q11, Q17, Q10, 2 capacitors C1, C2 and 2 resistors R5 and R9, wherein the base of a triode Q8 in the signal conversion circuit is respectively connected with one end of the resistor R5 and the collector of a triode Q11, the other end of the resistor R5 is connected with one end of a capacitor C1 and the collector of a triode Q10, the other end of the capacitor C1 is connected with a high-level VCC, the emitter of the triode Q11 is respectively connected with the emitter of a triode Q10 and the collector of a triode Q17, the base of the triode Q17 is connected with the base of a triode Q18, the emitter of a triode Q17 is connected with the emitter of a triode Q18, one end of a capacitor C2 is connected with the high-level VCC, the other end of the capacitor C2 is respectively connected with the base of a triode Q13, one end of a resistor R9 and the output port Va, and the other end of a resistor R9 is connected with the base of the triode Q10.
The signal conversion circuit: through the treatment of voltage-stabilizing and voltage-dividing of signal, charging and discharging and monitoring circuit, video signal of VGA standard is converted into CVBS standard, in the circuit, triode Q9 and triode Q8, triode Q11 and triode Q10 form a differential circuit, voltage is taken from the base electrode of triode Q9, signal is added to the base electrode of Q10 through resistor R9, when the signal amplitude is small, the base electrode voltage of triode Q10 is high, triode Q10 is in saturation state, triode Q11 is in cut-off state, the high level of the collector electrode of triode Q11 is added to the base electrode of triode Q8, triode Q8 is in saturation state, leading triode Q9 to be cut off, the collector electrode of triode Q9 is high level, at this moment, the operational amplifier gain is maximized, the signal processing effect is good, the collector electrode of triode Q11 and triode Q10 is provided with pull-up level through capacitor C1 and resistor R5, diode D1 plays the role of unidirectional signal conduction, the resistor R2 and the resistor R4 provide partial voltage for the base electrode of the triode Q2, the triode Q15, the triode Q16, the triode Q18 and the triode Q17 ensure that the voltage meets the requirement, and the capacitor C2 ensures that the output voltage is stable and effective.
Specifically, the wireless transmitting circuit comprises an input port Va, 2 capacitors C3, C4, 5 transistors Q3, Q4, Q12, Q14, Q1, and 2 resistors R7, R10, wherein the input port Va is connected to an emitter of the transistor Q4, a base of the transistor Q4 is connected to a collector of the transistor Q3, a base of the transistor Q1, and one end of the capacitor C3, another end of the capacitor C3 is connected to one end of the capacitor C4 and a collector of the transistor Q14, another end of the capacitor C4 is connected to a base of the transistor Q12 and one end of the resistor R10, another end of the resistor R10 is connected to a base of the transistor Q14, an emitter of the transistor Q12 is grounded, a collector of the transistor Q12 is connected to one end of the resistor R7, another end of the resistor R7 is connected to an emitter of the transistor Q3 and an emitter of the transistor Q1, and a collector of the transistor Q1 is connected to a high level VCC, the base of the triode Q3 is connected to the collector of the triode Q4 and the high level VCC, respectively. The wireless transmitting circuit comprises 3 diodes D2, 3 triodes Q2, 3 resistors R2, and a capacitor C2, wherein the anode of the diode D2 is respectively connected with the base of the triode Q2, the collector of the triode Q2, and one end of the resistor R2, the other end of the resistor R2 is respectively connected with the base of the triode Q2 and one end of the capacitor C2, the other end of the capacitor C2 is respectively connected with the collector of the triode Q2, the base of the triode Q2, the emitter of the triode Q2, the anode of the diode D2, one end of the resistor R2, the cathode of the diode D2, and the other end of the capacitor C2, the base of the triode Q2 is connected with the collector of the triode Q2 and the anode of the diode D2, and the collector of the triode Q2 are respectively connected with the base of the triode Q2 and the cathode of the diode D2, One end of the resistor R6 is connected, the other end of the resistor R6 is grounded, an emitter of the triode Q5 is connected with the high-level VCC, an emitter of the triode Q14 is grounded, and the output port Vb is connected with a base electrode of the triode Q6.
The wireless transmission circuit: the signal is converted into the original electric signal, then the reverse conversion is carried out on the channel, the baseband signal is converted into the signal suitable for being transmitted in the channel through the modulator at the transmitting end, then the reverse conversion is carried out through the demodulator at the receiving end, the signal input from the front stage is input through the emitter of the triode Q4, the signal outside the frequency band is removed through the base of the triode Q3, the anti-interference performance of the input signal is improved, the signal is input into the collector of the triode Q12 after passing through the resistor R7, a high-frequency tuning loop is formed through the capacitor C4 and the resistor R10, the diodes D2, D3 and D4 prevent the overvoltage damage circuit, the triode Q7 plays an amplifying role on the signal, the high-frequency signal is transmitted through the triodes Q5 and Q6 to transmit the wireless signal, the oscillation filtering is carried out on the signal through the resistors R3 and C5 to eliminate the harmonic influence, and prevent the situations of short circuit, overload and the like.
Specifically, the power driving circuit includes an input port Vb, a clamping diode D5, field effect transistors Q19, 4 resistors R16, R14, R20, R12, 4 capacitors C6, C7, C9, C10, 2 inductors L1, L2, and an amplifier U3, in which the input port Vb is connected to the anode of the clamping diode D5, the cathode of the clamping diode D5 is connected to one end of a capacitor C7 and the drain of the field effect transistor Q19, the other end of the capacitor C7 is connected to one end of a resistor R16 and one end of a resistor R20, the other end of the resistor R16 is connected to the non-inverting input end of the amplifier U3, the other end of the resistor R20 is connected to one end of a capacitor C10, the other end of the capacitor C10 is grounded, the gate of the field effect transistor Q19 is connected to one end of an inductor L2, and the other end of the inductor L2 is connected to one end of the resistor 63r 14, one end of the resistor L1 and one end of the resistor R12, The inverting input end of the amplifier U3 is connected, the other end of the resistor R14 is connected with the high level VCC, the other end of the resistor R12 is connected with one end of the capacitor C6, the other end of the capacitor C6 is grounded, the other end of the inductor L1 is connected with the output end of the amplifier U3 and one end of the capacitor C9, the other end of the capacitor C9 is grounded, and the source end of the field effect transistor Q19 is connected with the high level VCC. The power supply driving circuit comprises an output port Vout, 3 amplifiers U1, U2, U3, 5 resistors R13, R15, R17, R18 and R19, a capacitor C8, one end of a resistor R18 is respectively connected with one end of a resistor R15 and the inverting input end of an amplifier U2, the other end of a resistor R18 is grounded, the other end of the resistor R15 is respectively connected with the output end of an amplifier U2 and one end of a capacitor C8, the other end of the capacitor C8 is respectively connected with the inverting input end of an amplifier U1, one end of a resistor R19 and one end of a resistor R17, the other end of the resistor R19 is grounded, the other end of the resistor R17 is connected with the output end of an amplifier U1, one end of the resistor R13 is connected with a high level VCC, the other end of the resistor R13 is respectively connected with the non-inverting input end of an amplifier U2 and the non-inverting input end of an amplifier U1, and the output port Vout is connected with the output port of an amplifier U1.
The power supply driving circuit: the circuit is safe by monitoring the characteristic that signals flow through a control power electronic device, controlling the charging and discharging and output actions of the circuit and ensuring the unidirectional flow of the signals through a clamping diode D5, wherein a resistance-capacitance absorption circuit consisting of a capacitor C7, a resistor R16, a resistor R20 and a capacitor C10 ensures the safety of the circuit, the signals are input into an amplifier U3 through a field effect transistor Q19 and an inductor L2, the signals are amplified for the first stage through an amplifier U3, the resistor R12, the capacitor C6 and the inductor L1 play a role in protecting electronic elements, the circuits are ensured to stably provide electric energy for a wireless transmitting module through the amplifier U2 and the amplifier U1, the normal driving of an external circuit is ensured through the resistors R17 and the R19, and the consumption of communication data amount is minimized through a reasonable scheduling strategy.
The signal is processed by the signal conversion circuit, the wireless transmitting circuit and the power supply driving circuit, so that the robustness of the communication module is improved, the quick response capability and the stable state performance of the MR glasses communication module circuit are ensured, the design requirements of intellectualization, miniaturization, high transmission rate, high performance and strong anti-interference capability are met, and the method has very important significance for improving the economic benefit and the working efficiency of production enterprises.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (5)
1. The utility model provides a communication module of MR glasses under complicated electromagnetic environment, includes signal conversion circuit, wireless transmitting circuit, the power drive circuit who connects gradually, its characterized in that: the signal conversion circuit comprises an input port Vin, a diode D1, 7 transistors Q2, Q8, Q9, Q15, Q16, Q13, 4 resistors R13, R13 and R13, wherein the input port Vin is connected with the base of the transistor Q13, the collector of the transistor Q13 is connected with the collector of the transistor Q13, the emitter of the transistor Q13 is connected with one end of the resistor R13, the other end of the resistor R13 is connected with a high-level VCC, the base of the transistor Q13 is respectively connected with one end of the resistor R13 and one end of the resistor R13, the other end of the resistor R13 is connected with the cathode of the diode D13, the other end of the resistor R13 is connected with the collector of the transistor Q13, the anode of the diode D13 is connected with the high-level VCC, the emitter of the transistor Q13 is respectively connected with the emitter of the transistor Q13, the collector of the transistor Q13, the base electrode of the triode Q15 is respectively connected with the base electrode of the triode Q16 and the base electrode of the triode Q18 and grounded, the emitter electrode of the triode Q15 is connected with one end of the resistor R11 and the collector electrode of the triode Q18, and the other end of the resistor R11 is respectively connected with the emitter electrode of the triode Q16 and the emitter electrode of the triode Q13.
2. The communication module of MR glasses in a complex electromagnetic environment as claimed in claim 1, wherein: the signal conversion circuit further comprises an output port Va, 3 triodes Q11, Q17, Q10, 2 capacitors C1, C2 and 2 resistors R5 and R9, wherein the base of a triode Q8 in the signal conversion circuit is respectively connected with one end of the resistor R5 and the collector of a triode Q11, the other end of the resistor R5 is connected with one end of a capacitor C1 and the collector of a triode Q10, the other end of the capacitor C1 is connected with a high-level VCC, the emitter of the triode Q11 is respectively connected with the emitter of a triode Q10 and the collector of a triode Q17, the base of the triode Q17 is connected with the base of a triode Q18, the emitter of a triode Q17 is connected with the emitter of a triode Q18, one end of a capacitor C2 is connected with the high-level VCC, the other end of the capacitor C13 is respectively connected with the base of a triode Q13, one end of a resistor R9 and the output port Va, and the other end of the resistor R9 is connected with the base of the triode Q10.
3. The communication module of MR glasses in a complex electromagnetic environment as claimed in claim 1, wherein: the wireless transmitting circuit comprises an input port Va, 2 capacitors C3, C4, 5 triodes Q3, Q4, Q12, Q14, Q1 and 2 resistors R7 and R10, wherein the input port Va is connected with an emitter of a triode Q4, a base of the triode Q4 is respectively connected with a collector of the triode Q3, a base of the triode Q1 and one end of a capacitor C3, the other end of the capacitor C3 is respectively connected with one end of a capacitor C4 and a collector of a triode Q14, the other end of the capacitor C4 is respectively connected with a base of a triode Q12 and one end of a resistor R10, the other end of a resistor R10 is connected with a base of a triode Q14, an emitter of the triode Q12 is grounded, a collector of a resistor Q12 is connected with one end of a resistor R7, the other end of the resistor R7 is respectively connected with an emitter of a triode Q3 and an emitter of a triode Q1, and a collector of the triode Q1 is connected with a high-level VCC, the base of the triode Q3 is connected to the collector of the triode Q4 and the high level VCC, respectively.
4. The communication module of MR eyeglasses in a complex electromagnetic environment as claimed in claim 3, wherein: the wireless transmitting circuit further comprises 3 diodes D2, 3 triodes Q2, 3 resistors R2, and a capacitor C2, wherein the anode of the diode D2 is respectively connected with the base of the triode Q2, the collector of the triode Q2, and one end of the resistor R2, the other end of the resistor R2 is respectively connected with the base of the triode Q2 and one end of the capacitor C2, the other end of the capacitor C2 is respectively connected with the collector of the triode Q2, the base of the triode Q2, the emitter of the triode Q2, the anode of the diode D2, one end of the resistor R2, the cathode of the diode D2, and the other end of the capacitor C2, the other end of the resistor R2 is connected with the emitter of the triode Q2, the base of the triode Q2 is connected with the collector of the triode Q2 and the anode of the diode D2, and the collector of the triode Q2 are respectively connected with the base of the diode D2 and the collector of the triode D2, One end of the resistor R6 is connected, the other end of the resistor R6 is grounded, an emitter of the triode Q5 is connected with the high-level VCC, an emitter of the triode Q14 is grounded, and the output port Vb is connected with a base electrode of the triode Q6.
5. The communication module of MR glasses in a complex electromagnetic environment as claimed in claim 1, wherein: the power supply driving circuit comprises an input port Vb, a clamping diode D5, a field effect transistor Q19, 4 resistors R16, R14, 4 capacitors C14, 2 inductors L14, L14 and an amplifier U14, wherein the input port Vb of the power supply driving circuit is connected with the anode of the clamping diode D14, the cathode of the clamping diode D14 is respectively connected with one end of the capacitor C14 and the drain of the field effect transistor Q14, the other end of the capacitor C14 is respectively connected with one end of the resistor R14 and one end of the resistor R14, the other end of the resistor R14 is connected with the non-inverting input end of the amplifier U14, the other end of the resistor R14 is connected with one end of the capacitor C14, the other end of the capacitor C14 is grounded, the gate of the field effect transistor Q14 is connected with one end of the inductor L14, the other end of the L14 is connected with one end of the inverting input end of the resistor R14, the other end of the resistor L14 is connected with one end of the amplifier U14, the other end of the resistor R14 is connected with a high-level VCC, the other end of the resistor R12 is connected with one end of a capacitor C6, the other end of the capacitor C6 is grounded, the other end of the inductor L1 is respectively connected with the output end of the amplifier U3 and one end of the capacitor C9, the other end of the capacitor C9 is grounded, and the source end of the field effect transistor Q19 is connected with the high-level VCC.
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| CN113783578B (en) | 2022-02-18 |
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Effective date of registration: 20240409 Address after: Room 1301-1303, 13th Floor, Commercial Office Building 1 #, Greenland Expo City, No. 1388 Jiulonghu Avenue, Honggutan District, Nanchang City, Jiangxi Province, 330038 Patentee after: Nanchang small walnut Technology Co.,Ltd. Country or region after: China Address before: Room 1814, Commercial Office Building 1 #, Greenland Expo Plaza, No. 1388 Jiulonghu Avenue, Honggutan New District, Nanchang City, Jiangxi Province, 330038 Patentee before: Jiangxi Yingchuang Information Industry Co.,Ltd. Country or region before: China |