CN111867025B - Low-power consumption microwave sensor and control circuit thereof - Google Patents
Low-power consumption microwave sensor and control circuit thereof Download PDFInfo
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- CN111867025B CN111867025B CN202010773953.7A CN202010773953A CN111867025B CN 111867025 B CN111867025 B CN 111867025B CN 202010773953 A CN202010773953 A CN 202010773953A CN 111867025 B CN111867025 B CN 111867025B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0261—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
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- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16Y—INFORMATION AND COMMUNICATION TECHNOLOGY SPECIALLY ADAPTED FOR THE INTERNET OF THINGS [IoT]
- G16Y20/00—Information sensed or collected by the things
- G16Y20/30—Information sensed or collected by the things relating to resources, e.g. consumed power
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0261—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level
- H04W52/0274—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level by switching on or off the equipment or parts thereof
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The embodiment of the disclosure provides a low-power consumption microwave sensor and a control circuit thereof, wherein the circuit comprises a low-noise amplifier, a mixer, a radio frequency oscillator, a power amplifier, a low-frequency filter amplifier 1 and a power management module; the power management module is used for providing periodic pulse operation for the low noise amplifier, the mixer, the radio frequency oscillator, the power amplifier and the low frequency filter amplifier 1 respectively, and the pulse operation time T ON In microsecond order, the pulse working gap T OFF In milliseconds. According to the invention, the power consumption of the microwave sensor is reduced by a rapid power-on dormancy switching mode, so that the microwave sensor can work in mobile application or in a low-power-consumption Internet of things.
Description
Technical Field
The present disclosure relates to the field of microwave sensor technology, and in particular, to a low power consumption microwave sensor and a control circuit thereof.
Background
With the rapid development of information technology development and the rapid development of internet of things application, the requirements for low-power consumption sensors are higher and higher. Traditional sensors of the internet of things report temperature sensors, photosensitive sensors, acoustic sensors, microwave radar sensors, and the like. Conventional microwave sensors are classified into various types, including Frequency Modulated Continuous Wave (FMCW) radar, ultra Wideband (UWB) radar, and doppler radar. The whole transceiver of the currently applied doppler radar is always in an on state, always transmits a constant millimeter wave signal to the outside, and always monitors the frequency of the receiver.
The sensor architecture shown in fig. 1 is a solution for a conventional doppler radar sensor, and is currently used in products on the market as well. But this solution does not allow for low power applications. This scheme currently also requires 19mW for minimum power consumption in 5.8GHz doppler applications. However, if an infrared sensor is used, the power consumption is approximately in the order of 150 uW. The way in which such transceivers are always in operation is therefore unacceptable in such low power applications.
Disclosure of Invention
In view of this, embodiments of the present disclosure provide a low power consumption microwave sensor and a control circuit thereof, which reduce power consumption of a radar sensor through a fast power-on sleep switching manner, so that the radar sensor can work in mobile applications or be used in a low power consumption internet of things.
In order to achieve the purpose, the invention provides the following technical scheme:
a control circuit of a low-power consumption microwave sensor comprises a low-noise amplifier, a mixer, a radio frequency oscillator, a power amplifier, a low-frequency filter amplifier 1 and a power management module, wherein the low-noise amplifier, the mixer, the radio frequency oscillator, the power amplifier and the low-frequency filter amplifier 1 are arranged in a control chip; the radio frequency oscillator generates a radio frequency signal, the radio frequency signal is amplified by the power amplifier and then is transmitted to the outside by the transmitting antenna, the receiving antenna acquires an induction signal, the induction signal passes through the low noise amplifier and then is input into the frequency mixer, the frequency mixer mixes the induction signal with a signal generated by the radio frequency oscillator, and the induction signal is output to the low frequency filter amplifier 1 by the frequency mixer;
the power management module is used for respectively providing periodic pulse work for the low noise amplifier, the mixer, the radio frequency oscillator, the power amplifier and the low frequency filter amplifier 1, and the pulse work time T ON In microsecond order, the pulse working gap T OFF In milliseconds;
the low-frequency filter amplifier further comprises a capacitor C1 arranged outside the control chip, one end of the capacitor C1 is connected with a pin of the low-frequency filter amplifier 1, the other end of the capacitor C1 is grounded, and the capacitor C1 is used for working at a pulse working time T ON In the method, the low-frequency filter amplifier 1 charges/discharges the capacitor C1 in the pulse working interval T OFF The output of the low-frequency filter amplifier 1 is in a high-impedance state, and the capacitor C1 stores the voltage signal.
In a preferred embodiment, the control circuit further comprises a passive filter arranged outside the control chip, the passive filter is connected with the capacitor C1, the voltage signal is output after passing through the passive filter, and the switching frequency component of the signal is filtered.
In a preferred embodiment, the control chip further includes a low-frequency filter amplifier 2, the voltage signal processed by the passive filter is input to the low-frequency filter amplifier 2, and the voltage signal is further filtered by the low-frequency filter amplifier 2 and output after signal amplification processing.
In a preferred embodiment, the control chip further includes a digital-to-analog conversion unit and a digital signal processing unit, the voltage signal processed and output by the low-frequency filter amplifier 2 is transmitted to the digital-to-analog conversion unit, and is converted into a digital signal by the digital-to-analog conversion unit, and the digital signal is finally output by the digital signal processing unit.
In a preferred embodiment, the passive filter includes a resistor R2 and a capacitor C2 connected in series, one end of the resistor R2 is connected to one end of the capacitor C1, one end of the capacitor C2 is connected to the other end of the resistor R2 and the pin of the low-frequency filter amplifier 2, and the other end of the capacitor C2 is grounded.
The invention also provides a low-power-consumption microwave sensor which comprises the control circuit of the low-power-consumption microwave sensor.
The invention discloses a low-power consumption microwave sensor and a control circuit thereof, which have the beneficial effects that: on the basis of ensuring an excellent sensing effect, the sensor reduces the power consumption of a module with more power consumption in the traditional sensor in a mode of fast power-on and power-off switching, and enables the radar sensor to work in mobile application or be used in a low-power-consumption Internet of things with extremely low power consumption.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings needed to be used in the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a diagram of a conventional Doppler radar sensor architecture;
FIG. 2 is a circuit diagram of a low power consumption microwave sensor according to the present invention;
FIG. 3 is a schematic diagram of the periodic pulsed operation of the power management module of the present invention;
fig. 4 is a graph of the voltage waveforms on the capacitor C1 and the capacitor C2 in the present invention.
Detailed Description
The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without inventive step, are intended to be within the scope of the present disclosure.
It is noted that various aspects of the embodiments are described below within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the disclosure, one skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. Additionally, such an apparatus may be implemented and/or such a method may be practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present disclosure, and the drawings only show the components related to the present disclosure rather than the number, shape and size of the components in actual implementation, and the type, amount and ratio of the components in actual implementation may be changed arbitrarily, and the layout of the components may be more complicated.
In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects may be practiced without these specific details.
Referring to fig. 2, the disclosed embodiment provides a control circuit of a low power consumption microwave sensor, including a low noise amplifier, a mixer, a radio frequency oscillator, a power amplifier, a low frequency filter amplifier 1 and a power management module, which are arranged inside a control chip; the radio frequency oscillator generates a radio frequency signal, the radio frequency signal is amplified by the power amplifier and then is transmitted to the outside by the transmitting antenna, the receiving antenna acquires an induction signal, the induction signal passes through the low noise amplifier and then is input into the frequency mixer, the frequency mixer mixes the induction signal with a signal generated by the radio frequency oscillator, and the induction signal is output to the low frequency filter amplifier 1 by the frequency mixer;
the power management module is used for respectively providing periodic pulse work for the low noise amplifier, the mixer, the radio frequency oscillator, the power amplifier and the low frequency filter amplifier 1, and the pulse work time T ON In microsecond order, the pulse working gap T OFF In milliseconds;
the low-frequency filter amplifier further comprises a capacitor C1 arranged outside the control chip, one end of the capacitor C1 is connected with a pin of the low-frequency filter amplifier 1, the other end of the capacitor C1 is grounded, and the capacitor C1 is used for working at a pulse working time T ON In the low-frequency filter amplifier 1, the capacitor C1 is charged/discharged in the pulse working interval T OFF Here, the output of the low frequency filter amplifier 1 is in a high impedance state, and the capacitor C1 stores the voltage signal.
In the use process of the sensor, most circuits in the chip system do not need to be in a working state all the time, and the sensing effect can be achieved when the chip system is in a time slot working state. Therefore, the control chip of the invention is internally provided with a control circuit which can provide pulse work for a module with larger consumption power in the chip, and the pulse work time is T ON ，T ON The time setting is relatively short, typically a few microseconds. Pulse working gap T OFF The modules consuming larger power are in a dormant state, and no power is consumed at this time. T is OFF Time compared to T ON The time is long, generally several milliseconds. The modules with larger consumption power inside the chip are a low-noise amplifier, a mixer, a low-frequency filter amplifier 1, a power amplifier and a radio-frequency oscillator. As shown in fig. 3, is a power management moduleThe periodic pulse operation diagram is a power supply power-on and power-off switching mode of a module with larger consumption power inside the chip. T of power consumption which is originally power consumption when no processing is performed can be realized by the above-described manner ON /T OFF ，T ON Typically a few microseconds, T OFF Typically a few milliseconds, which changes the power consumption to one thousandth of what it would be without processing.
The function of the low frequency filter 1 is to convert the current signal into a voltage signal and to provide amplification. However, the power consumption of the module is relatively high, so that the power is saved by adopting a power-up and power-down switching mode. However, when the module is powered on or powered off, the signal is also powered on or powered off, so that in this embodiment, the signal is stored by the external capacitor C1, and when the low-frequency filter 1 is powered on, the external capacitor C1 is charged or discharged; when the low-frequency filter 1 is powered off, the external part is in a high-impedance state, and the capacitor C1 stores the voltage signal. At this time, the waveform on the capacitor C1 is shown by the solid line in fig. 4 (a).
However, some harmonics may occur in such a mode, and in a preferred embodiment, the control device further includes a passive filter disposed outside the control chip, the passive filter is connected to the capacitor C1, and the voltage signal is filtered by the passive filter to remove the switching harmonic signal and then output, and is restored to the original smooth signal.
Specifically, the passive filter includes a resistor R2 and a capacitor C2 connected in series, one end of the resistor R2 is connected to one end of the capacitor C1, one end of the capacitor C2 is connected to the other end of the resistor R2 and a pin of the low-frequency filter amplifier 2, and the other end of the capacitor C2 is grounded. The harmonics are filtered out by the resistor R2 and the capacitor C2, and the waveform is restored to be continuous, as shown in fig. 4 (b).
In a preferred embodiment, the control chip further includes a low-frequency filter amplifier 2, the voltage signal processed by the passive filter is input to the low-frequency filter amplifier 2, and the voltage signal is further filtered by the low-frequency filter amplifier 2 and is output after being amplified.
In a preferred embodiment, the control chip further includes a digital-to-analog conversion unit and a digital signal processing unit, the voltage signal processed and output by the low-frequency filter amplifier 2 is transmitted to the digital-to-analog conversion unit, and is converted into a digital signal by the digital-to-analog conversion unit, and the digital signal is finally output by the digital signal processing unit.
According to the invention, the module with higher power consumption in the traditional sensor is switched between the power-up mode and the power-down mode quickly, so that the sensor obtains the same sensing effect as that of the traditional scheme under the condition of great power consumption optimization.
The above description is only for the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present disclosure should be covered within the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
Claims (4)
1. A control circuit of a low-power consumption microwave sensor is characterized by comprising a low-noise amplifier, a mixer, a radio frequency oscillator, a power amplifier, a low-frequency filter amplifier 1 and a power management module, wherein the low-noise amplifier, the mixer, the radio frequency oscillator, the power amplifier and the low-frequency filter amplifier 1 are arranged in a control chip; the radio frequency oscillator generates a radio frequency signal, the radio frequency signal is amplified by the power amplifier and then is transmitted to the outside by the transmitting antenna, the receiving antenna acquires an induction signal, the induction signal passes through the low noise amplifier and then is input into the frequency mixer, the frequency mixer mixes the induction signal with a signal generated by the radio frequency oscillator, and the induction signal is output to the low frequency filter amplifier 1 by the frequency mixer;
the power management module is used for respectively providing periodic pulse work for the low noise amplifier, the mixer, the radio frequency oscillator, the power amplifier and the low frequency filter amplifier 1, wherein the pulse work time TON is microsecond level, and the pulse work gap TOFF is millisecond level;
the control circuit also comprises a capacitor C1 arranged outside the control chip, one end of the capacitor C1 is connected with a pin of the low-frequency filter amplifier 1, the other end of the capacitor C1 is grounded, the low-frequency filter amplifier 1 charges/discharges the capacitor C1 in the pulse working time TON, the output of the low-frequency filter amplifier 1 is in a high-impedance state in the pulse working gap TOFF, and the capacitor C1 stores a voltage signal;
the control circuit also comprises a passive filter arranged outside the control chip, wherein the passive filter is connected with the capacitor C1, and a voltage signal is output after passing through the passive filter to filter the switching frequency component of the signal;
the control chip also comprises a low-frequency filter amplifier 2, the voltage signal processed by the passive filter is input to the low-frequency filter amplifier 2, and the voltage signal is continuously filtered by the low-frequency filter amplifier 2 and is output after being amplified.
2. The control circuit of the low-power-consumption microwave sensor according to claim 1, wherein the control chip further comprises a digital-to-analog conversion unit and a digital signal processing unit, the voltage signal processed by the low-frequency filter amplifier 2 is transmitted to the digital-to-analog conversion unit, the voltage signal is converted into a digital signal by the digital-to-analog conversion unit, and the digital signal is finally output after passing through the digital signal processing unit.
3. The control circuit of the low-power-consumption microwave sensor according to claim 1, wherein the passive filter includes a resistor R2 and a capacitor C2 connected in series, one end of the resistor R2 is connected to one end of the capacitor C1, one end of the capacitor C2 is connected to the other end of the resistor R2 and a pin of the low-frequency filter amplifier 2, and the other end of the capacitor C2 is grounded.
4. A low power consumption microwave sensor, characterized in that it comprises a control circuit of a low power consumption microwave sensor according to any of claims 1 to 3.
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| CN202010773953.7A CN111867025B (en) | 2020-08-04 | 2020-08-04 | Low-power consumption microwave sensor and control circuit thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1815924A (en) * | 2005-01-31 | 2006-08-09 | 株式会社日立制作所 | Sensor node, base station, and sensor network system |
| CN105092991A (en) * | 2014-05-08 | 2015-11-25 | 国家电网公司 | Wireless noise sensor |
| CN211086636U (en) * | 2019-12-10 | 2020-07-24 | 达仁智能科技(佛山)有限公司 | Low-power consumption microwave sensor and control circuit thereof |
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| CN105049923B (en) * | 2015-08-28 | 2019-03-01 | 小米科技有限责任公司 | Wake up the method and device of electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1815924A (en) * | 2005-01-31 | 2006-08-09 | 株式会社日立制作所 | Sensor node, base station, and sensor network system |
| CN105092991A (en) * | 2014-05-08 | 2015-11-25 | 国家电网公司 | Wireless noise sensor |
| CN211086636U (en) * | 2019-12-10 | 2020-07-24 | 达仁智能科技(佛山)有限公司 | Low-power consumption microwave sensor and control circuit thereof |
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