CN103840568A - Low-power-consumption power supply system for wireless sensor network - Google Patents

Abstract

The invention relates to a low-power power supply system for wireless sensor networks. The single-chip microcomputer enters different working states according to the data request state of the gateway, and controls the power on and off of the data acquisition front end and the signal conditioning module. When there is no data In the case of a request, the microcontroller sleeps and enters a low-power consumption mode, and the entire front-end data acquisition and signal conditioning circuit is disconnected from the power supply; when the data request signal is received by the wireless receiving module, the wireless data receiving module wakes up the microcontroller and enters the data acquisition state. After the data is collected and sent to the wireless gateway, and there is no continuous data request, the single-chip microcomputer enters the dormant state again until the next data request arrives. According to the data request state of the gateway in the wireless sensor network, the invention enables the single chip microcomputer to work in two modes of sleep and data collection, and controls the on-off of the data collection front-end power supply according to the request state of the gateway, thereby achieving the purpose of reducing power consumption.

Description

A low power supply system for wireless sensor network

technical field

The invention relates to the field of wireless power supply, in particular to a low power consumption power supply system for a wireless sensor network.

Background technique

At present, wireless sensor networks are more and more used in environmental monitoring, cultural relics protection, modern agriculture, wild animal protection, smart home and smart transportation and other fields. However, due to the restriction of the power supply form (battery power supply), power consumption has always been a key issue restricting the application and promotion of wireless sensor networks. In most cases, the network does not need to continuously collect and send data, and there is no need to keep the entire node in the data collection state. Therefore, it is relatively important to invent a low-power supply mode for wireless sensor network nodes. Strong application value.

At present, people's research on low-power supply of wireless sensor nodes mainly focuses on wireless communication protocols, sleep scheduling of controllers and other aspects. There are relatively few studies on how to use the controller to control the data acquisition front-end to turn on the circuit when there is a data request, and turn off the circuit when there is no data request, so as to reduce the power consumption of wireless nodes as much as possible.

In view of the above-mentioned defects, the author of the present invention has finally obtained this creation through long-term research and practice.

Contents of the invention

The object of the present invention is to provide a low power consumption power supply system for a wireless sensor network to overcome the above-mentioned technical defects.

In order to achieve the above purpose, the present invention provides a low-power power supply system for wireless sensor networks, which includes an antenna, a wireless receiving module, a single-chip microcomputer, a conditioning circuit, a data acquisition front end, a power supply, and an on-off circuit, wherein the The wireless receiving module is connected with the single-chip microcomputer, the conditioning circuit is connected with the single-chip microcomputer, and the wireless transceiver module and the single-chip microcomputer are always connected with the power supply;

The antenna is connected to the wireless receiving module, and is used to receive the wireless connection request of the gateway, and send the request to the single-chip microcomputer;

The single-chip microcomputer enters different working states according to the data request status of the gateway, and controls the power on and off of the data acquisition front end and the signal conditioning module, and then in the case of no data request, the single-chip microcomputer sleeps and enters a low power consumption mode. The front-end data acquisition and signal conditioning circuit is disconnected from the power supply;

When the data request signal is received by the wireless receiving module, the wireless data receiving module wakes up the microcontroller and enters the data collection state. After the data collection is completed and sends the data to the wireless gateway, and there is no continuous data request, the microcontroller enters the sleep state again until Until the next data request comes.

Further, the data acquisition front end includes a data acquisition and signal conditioning module, the data acquisition and signal conditioning module is connected to the power supply through the normally open end of the relay, the single-chip microcomputer is connected to the transistor base through the resistor R1, and the power supply is connected to the collector through the resistor R2, The transmitter is connected to the conditioning circuit;

The relay is controlled by the conduction state of the transistor, and the conduction of the transistor is controlled by the single-chip microcomputer.

Further, the single-chip microcomputer determines the high and low state of the output level according to the output of the wireless transceiver module, and the system is in the alternate state of the two states of dormancy and work: in the dormant state, when there is no data connection request, the wireless transceiver module and the single-chip microcomputer are all in In the dormant state, the pin level state of the microcontroller connected to the transistor is low, the transistor is cut off, the relay switch is turned off, and the data acquisition and signal conditioning module is completely disconnected from the power supply.

Further, when the system is in the working state, when the wireless transceiver module receives a data request, the module is first woken up. At this time, the wireless transceiver module wakes up the microcontroller in a dormant state, and the pin connected to the transistor outputs a high level and continues For a period of time, until the first collection and transmission of data is completed; if there is no subsequent continuous data request, the wireless data transceiver module and the single-chip microcomputer will enter the dormant state again, the transistor will be cut off, and the relay will block the connection between the data collection and signal conditioning module and the power supply. The system goes to sleep again until the next data request arrives.

Further, the wireless transceiver module is JF24D, the single-chip microcomputer is MSP430G2553, and the power supply is a dry battery pack.

Compared with the prior art, the beneficial effect of the present invention is that: according to the data request state of the gateway in the wireless sensor network, the present invention enables the single-chip microcomputer to work in two modes of dormancy and data collection, and controls the data collection front-end power supply according to the request state of the gateway On and off, so as to achieve the purpose of reducing power consumption. The invention uses a single-chip microcomputer, a transistor and a relay to control the working state of the whole circuit, the design idea is clear and concise, the cost is low, and it is suitable for large-area use.

Description of drawings

Fig. 1 is the functional block diagram of the low power consumption power supply system for wireless sensor network of the present invention;

FIG. 2 is a schematic circuit diagram of a low-power power supply system for a wireless sensor network according to the present invention.

Detailed ways

The above and other technical features and advantages of the present invention will be described in more detail below in conjunction with the accompanying drawings.

The present invention utilizes the dormancy scheduling strategy of power supply management to reduce the power consumption of wireless sensor nodes in the process of data collection and transmission as much as possible, and improve the utilization rate of energy as much as possible.

See also shown in Fig. 1, it is the functional block diagram of the low power consumption power supply system that the present invention is used for wireless sensor network, the present invention makes single-chip microcomputer work in dormancy and data acquisition according to the data request state of gateway in wireless sensor network This mode controls the power on and off of the data acquisition front-end according to the request status of the gateway, thereby achieving the purpose of reducing power consumption.

The system of the present invention includes an antenna, a wireless receiving module, a single-chip microcomputer, a conditioning circuit, a data acquisition front end, a power supply and an on-off circuit, wherein the wireless receiving module is connected to the single-chip microcomputer, and the conditioning circuit is connected to the single-chip microcomputer.

The data acquisition front end includes a data acquisition and signal conditioning module.

The antenna is connected to the wireless receiving module, and is used to receive the wireless connection request of the gateway, and send the request to the single-chip microcomputer, and the single-chip microcomputer enters different working states according to the data request status of the gateway, and controls the data acquisition front end and the signal conditioning module The power supply is turned on and off, and then in the case of no data request, the single chip microcomputer sleeps and enters the low power consumption mode, and the entire front-end data acquisition and signal conditioning circuit is disconnected from the power supply;

When the data request signal is received by the wireless receiving module, the wireless data receiving module wakes up the microcontroller and enters the data collection state. After the data collection is completed and sends the data to the wireless gateway, and there is no continuous data request, the microcontroller enters the sleep state again until Until the next data request comes.

In this embodiment, the wireless transceiver module is JF24D, the single-chip microcomputer is MSP430G2553, and the power supply is a dry battery pack.

Please refer to shown in Fig. 2, it is the circuit schematic diagram of the low power consumption power supply system that is used for wireless sensor network of the present invention, and wireless transceiver module and single-chip microcomputer are connected with power supply all the time, and data acquisition and signal conditioning module pass through the normally open end of relay and The power supply is connected, the microcontroller is connected to the base of the transistor through the resistor R1, the power supply is connected to the collector through the resistor R2, and the transmitter is connected to the conditioning circuit. The relay is controlled by the conduction state of the transistor, and whether the transistor is on or not is controlled by the single-chip microcomputer. The single-chip microcomputer determines the high and low state of the output level according to the output of the wireless transceiver module. The whole circuit is in an alternate state of sleep and work:

Dormancy state: When there is no data connection request, the wireless transceiver module and the single-chip microcomputer are both in the dormant state, the pin level state of the single-chip microcomputer connected to the transistor is low, the transistor is cut off, the relay switch is turned off, and the data acquisition and signal conditioning module is completely connected to the power supply. disconnect. In this state, the power consumption of the entire node is the lowest, and the current is mainly consumed in the wireless transceiver module, transistor leakage current and single-chip microcomputer, and its magnitude is on the order of microamperes.

Working status: When the wireless transceiver module receives a data request, the module is first awakened, and the wireless transceiver module wakes up the dormant single-chip microcomputer, and the pin connected to the transistor of the single-chip microcomputer outputs a high level for a period of time until the completion Once the data is collected and sent. If there is no subsequent continuous data request, the wireless data transceiver module and the single-chip microcomputer enter the dormant state again, the transistor is cut off, the relay blocks the connection between the data acquisition and the signal conditioning module and the power supply, and the whole system enters the dormant state again until the next data request arrives. .

The above descriptions are only preferred embodiments of the present invention, and are only illustrative rather than restrictive to the present invention. Those skilled in the art understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the invention, but all will fall within the protection scope of the present invention.

Claims (5)

1. A low-power power supply system for wireless sensor networks, characterized in that it includes antennas, wireless receiving modules, single-chip microcomputers, conditioning circuits, data acquisition front-ends, power supplies and on-off circuits, wherein the wireless The receiving module is connected with the single-chip microcomputer, the conditioning circuit is connected with the single-chip microcomputer, and the wireless transceiver module and the single-chip microcomputer are always connected with the power supply; The antenna is connected to the wireless receiving module, and is used to receive the wireless connection request of the gateway, and send the request to the single-chip microcomputer; The single-chip microcomputer enters different working states according to the data request state of the gateway, and controls the power on and off of the data acquisition front-end and the signal conditioning module. When there is no data request, the single-chip microcomputer sleeps and enters a low power consumption mode. The entire front-end The data acquisition and signal conditioning circuit is disconnected from the power supply; When the data request signal is received by the wireless receiving module, the wireless data receiving module wakes up the microcontroller and enters the data collection state. After the data collection is completed and sends the data to the wireless gateway, and there is no continuous data request, the microcontroller enters the sleep state again until Until the next data request comes. 2. the low power consumption power supply system for wireless sensor network according to claim 1, it is characterized in that, described data acquisition front end comprises a data acquisition and signal conditioning module, data acquisition and signal conditioning module pass through the normal of relay The beginning is connected to the power supply, the microcontroller is connected to the base of the transistor through the resistor R1, the power supply is connected to the collector through the resistor R2, and the transmitter is connected to the conditioning circuit; The relay is controlled by the conduction state of the transistor, and the conduction of the transistor is controlled by the single-chip microcomputer. 3. The low-power power supply system for wireless sensor network according to claim 1 or 2, characterized in that, the single-chip microcomputer determines the high and low state of the output level according to the output of the wireless transceiver module, and the system is in sleep and work The two states alternate with each other: in the dormant state, when there is no data connection request, the wireless transceiver module and the single-chip microcomputer are both in the dormant state, the pin level state of the single-chip microcomputer connected to the transistor is low, the transistor is cut off, and the relay switch is turned off. The data acquisition and signal conditioning module is completely disconnected from the power supply. 4. the low power consumption power supply system for wireless sensor network according to claim 3, it is characterized in that, when system is in working state, when wireless transceiver module receives data request, this module is woken up at first, at this moment The wireless transceiver module wakes up the dormant single-chip microcomputer, and the pin connected to the transistor of the single-chip microcomputer outputs a high level and lasts for a period of time until the data collection and transmission are completed; if there is no subsequent continuous data request, the wireless data transceiver module and The single-chip microcomputer enters the dormant state again, the transistor is cut off, the relay blocks the connection between the data acquisition and signal conditioning module and the power supply, and the whole system enters the dormant state again until the next data request arrives. 5. The low-power power supply system for wireless sensor networks according to claim 1 or 2, wherein the wireless transceiver module is JF24D, the single-chip microcomputer is MSP430G2553, and the power supply is a dry battery pack.

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