JP6809828B2 - Power control device, transmitter and power control method - Google Patents

Description

The present invention relates to power supply control.

In order to save power in an electric device, it is effective to narrow the power supply portion of the electric device when not in use, that is, to put it in a so-called sleep state.

For example, Patent Documents 1 to 3 disclose a wireless LAN (Local Area Network) device equipped with a wake-up receiver that can be immediately activated only when the user uses it. In this method, the wireless terminal performs frame length modulation that expresses an ID (Identifier) of each access point desired to be activated by the frame length of the wireless LAN signal to be transmitted. Then, the wireless access point converts the frame length of the received wireless LAN signal into an ID by the wakeup receiver. Then, the wireless access point releases the sleep state when the converted ID matches its own ID.

Japanese Unexamined Patent Publication No. 2012-175516 Japanese Unexamined Patent Publication No. 2013-085087 JP-A-2015-177516

In the frame length modulation method, the frame length is obtained only by the presence or absence of a signal having a predetermined amplitude. Therefore, the frame length modulation method is easily affected by radio wave interference. Therefore, the wireless access point may wake up from the sleep state due to false detection of an ID due to an interrupt of another frame that is not for the wireless access point. Therefore, the method disclosed in Patent Documents 1 to 3 has a problem that unnecessary power consumption may occur in the wireless access point.

An object of the present invention is to provide a power supply control device or the like capable of suppressing the generation of unnecessary power consumption.

The power supply control device of the present invention includes a determination unit and a processing unit. The determination unit determines whether or not the duration of the input signal belongs to a predetermined time range and whether or not any one of at least one predetermined feature of the waveform of the signal is present. The processing unit starts supplying electric power to a predetermined circuit when both the determination results of the genus / nonexistence and the existence / nonexistence are positive.

The power supply control device and the like of the present invention can suppress the generation of unnecessary power consumption.

It is a conceptual diagram which shows the structural example of the wireless LAN system of this embodiment. It is a conceptual diagram which shows the configuration example of a wireless LAN terminal. It is a conceptual diagram which shows the structural example of a signal generation part. It is a conceptual diagram which shows the configuration example of a wireless LAN access point. It is a conceptual diagram which shows the structural example of a power-source control part. It is a conceptual diagram which shows the processing flow example performed by the wireless LAN terminal of this embodiment. It is a conceptual diagram which shows an example of a wake-up signal. It is a conceptual diagram which shows the detailed processing flow example of S101 shown in FIG. It is a conceptual diagram which shows the detailed processing flow example of S102 shown in FIG. It is a conceptual diagram which shows the wake-up process performed by a power-source control unit. It is a conceptual diagram which shows the detailed processing flow example of S411 shown in FIG. It is a conceptual diagram which shows the minimum structure of the power-source control device of this invention.

[Configuration and operation]
FIG. 1 is a conceptual diagram showing the configuration of a wireless LAN system 11 which is an example of the wireless LAN system of the present embodiment.

The wireless LAN system 11 includes a wireless LAN terminal 100 and a wireless LAN access point 110.

The wireless LAN terminal 100 creates a wake-up signal for wake-up of the wireless LAN access point 110 in the sleep state. Here, the "sleep state" refers to a state in which power from the power supply is not supplied to many parts of the wireless LAN access point 110. Further, "wake-up" refers to a transition from a sleep state to a state in which power is supplied to a portion where power was not supplied in the sleep state.

The wireless LAN terminal 100 is generated by superimposing a wake-up signal transmitted by the wireless LAN terminal 100 on a frame length modulated signal having a frame length representing an ID (Identifier) held by the wireless LAN access point 110. To do.

Here, the superposed signal is a signal for notifying the wireless LAN access point 110 that the wake-up signal is not erroneous. As described in the section [Problems to be Solved by the Invention], the frame length modulation method is greatly affected by radio wave interference. Therefore, the wireless access point may wake up from the sleep state due to false detection of the ID due to the interruption of the wireless frame of another signal not for the wireless access point. The superimposition signal is a signal for suppressing the occurrence of the sleep state release due to the false detection of the ID.

An example of the wake-up signal and an example of its generation method will be described later.

The wireless LAN terminal 100 transmits the generated wake-up signal to the wireless space prior to transmitting the information signal to the wireless LAN access point 110. Here, the information signal refers to a signal other than the wake-up signal. The wake-up signal also reaches the wireless LAN access point 110.

After transmitting the wake-up signal, the wireless LAN terminal 100 transmits an information signal addressed to the wireless LAN access point 110 to the wireless space.

The wireless LAN access point 110 is in a sleep state until it detects the arrival of a wakeup signal addressed to the wireless LAN access point 110. However, even in the sleep state, power is supplied to the part that detects the wakeup signal. Then, when a certain signal arrives through the wireless space, the wireless LAN access point 110 determines whether the arrived signal is a wake-up signal addressed to the wireless LAN access point 110. The wireless LAN access point 110 makes the determination by determining the presence or absence of the superimposed signal and determining whether or not the frame length of the wakeup signal represents the ID of the wireless LAN access point 110.

When the wireless LAN access point 110 determines that the received signal is a wakeup signal addressed to the wireless LAN access point 110, the wireless LAN access point 110 performs a wakeup. Then, after the wake-up, the information signal sent from the wireless LAN terminal 100 is received.

The wireless LAN access point 110 goes into the sleep state described above when, for example, a part other than the part for detecting the wakeup signal does not operate for a predetermined time.

FIG. 2 is a conceptual diagram showing the configuration of the wireless LAN terminal 100a, which is an example of the wireless LAN terminal 100 shown in FIG.

The wireless LAN terminal 100a includes a signal generation unit 101, a power supply 102, a communication unit 103, a processing unit 104, and an antenna 105.

The signal generation unit 101, the communication unit 103, and the antenna 105 form a transmission unit 106 that is a part that transmits a wake-up signal to the wireless LAN access point 110.

The signal generation unit 101 generates the wake-up signal described in the description of FIG.

The power supply 102 supplies the signal generation unit 101, the communication unit 103, and the processing unit 104 with electric power for their operation.

The communication unit 103 wirelessly transmits information through the antenna 105. The transmission includes transmission of a wake-up signal generated by the signal generation unit 101 and transmission of an information signal generated by the processing unit 104. The communication unit 103 may receive the signal through the antenna 105.

The processing unit 104 performs processing other than the generation of the wake-up signal and the transmission of the signal, including the generation of the information signal.

FIG. 3 is a conceptual diagram showing the configuration of the signal generation unit 101b, which is an example of the signal generation unit 101 shown in FIG.

The signal generation unit 101b includes a processing unit 1012 and a recording unit 1013.

The processing unit 1012 performs a process of generating a wake-up signal. An example of the process of generating the wake-up signal will be described later. The processing unit 1012 transmits the generated wake-up signal to the wireless space via the communication unit 103 and the antenna 105 shown in FIG. The processing unit 1012 also causes the recording unit 1013 to record information as needed.

The recording unit 1013 records the information instructed by the processing unit 1012. The recording unit 1013 also sends the information instructed by the processing unit 1012 to the processing unit 1012.

FIG. 4 is a conceptual diagram showing the configuration of the wireless LAN access point 110a, which is an example of the wireless LAN access point 110 shown in FIG.

The wireless LAN access point 110a includes a power supply 111, a power supply control unit 112, a power supply 113, a processing unit 114, a communication unit 115, and an antenna 116.

The power supply 111 supplies electric power to the power supply control unit 112 in the sleep state. The power supply 111 does not have to supply power to the power supply control unit 112 at the time of wakeup. When the power supply 111 does not supply power to the power supply control unit 112 at the time of wakeup, the wireless LAN access point 110a can further save power.

The power control unit 112 receives the signal transmitted through the antenna 116 in the sleep state. Then, the power supply control unit 112 determines whether or not the arrived signal is a wake-up signal addressed to the wireless LAN access point 110a. When the power control unit 112 determines that the received signal is a wake-up signal addressed to the wireless LAN access point 110a, the power control unit 112 instructs the power supply 113 to start supplying power to the processing unit 114 and the communication unit 115.

The processing unit 114 generates an information signal transmitted through the communication unit 115 and the antenna 116, processes the information received via the antenna 116 and the communication unit 115, and the like.

The communication unit 115 transmits / receives information signals via the antenna 116.

FIG. 5 is a conceptual diagram showing the configuration of the power supply control unit 112b, which is an example of the power supply control unit 112 shown in FIG.

The power control unit 112b represents a receiving unit 1121, a processing unit 1122, and a recording unit 1123.

The receiving unit 1121 is connected to the antenna 116 shown in FIG. 4 and receives a signal transmitted through the antenna 116. The receiving unit 1121 sends the received signal to the processing unit 1122.

The processing unit 1122 processes the signal sent from the receiving unit 1121. An example of this process will be described later. The processing unit 1122 causes the recording unit 1123 to record information as needed.

The recording unit 1123 records the information instructed by the processing unit 1122. The recording unit 1123 also sends the information instructed by the processing unit 1122 to the processing unit 1122.

FIG. 6 is a conceptual diagram showing an example of a processing flow of processing performed by the wireless LAN terminal 100a shown in FIG.

First, as a process of S101, the signal generation unit 101 generates a frame length modulated signal having a frame length representing the ID held by the wireless LAN access point 110 shown in FIG. A detailed example of the processing of S101 will be described later.

Next, as a process of S102, the signal generation unit 101 superimposes the superimposition signal on the frame length modulation signal generated in S101. A detailed example of the processing of S102 will be described later. The frame length modulation signal in which the superposed signals are superposed is sent to the communication unit 103.

Then, as a process of S103, the communication unit 103 transmits a frame length modulation signal in which the superposed signals are superposed to the wireless space via the antenna 105 shown in FIG.

In parallel with the processing of S101 to S103, as the processing of S104, the processing unit 104 generates an information signal to be transmitted to the wireless LAN access point 110. The generated information signal is sent to the communication unit 103.

Then, the communication unit 103 transmits the information signal generated by the processing of S104 toward the wireless LAN access point 110.

FIG. 7 is a conceptual diagram showing an example of a wake-up signal. 7 (a) is a frame length modulated signal, FIG. 7 (b) is a superposed signal, and FIG. 7 (c) is a signal obtained by superimposing a superposed signal on a frame length modulated signal. One scale on the horizontal axis in each figure of FIG. 7 is the sampling time at the wireless LAN access point 110.

As shown in FIG. 7A, the frame length modulation signal rises from the 1st scale on the horizontal axis, the voltage value is 0.1 from the 1st scale to the 12th scale, and the voltage value is zero after the 13th scale. is there.

In FIG. 7A, the line connecting the voltage values at each scale on the horizontal axis simply connects the values at each scale on the horizontal axis. The actual voltage value between the scales on the horizontal axis may not be equal to what the straight line represents. This point is the same in FIGS. 7 (b) and 7 (c).

In the voltage value for each scale on the horizontal axis, from the time when the rise of the voltage value is completed (the time when the voltage value becomes 0.1) in FIG. 7 (a) to the time when the fall is completed (the voltage value becomes zero). The time until (time) is the frame length. Then, the frame length represents the ID of the wireless LAN access point 110.

As shown in FIG. 7 (b), the superimposed signal is set to 3 scales on the horizontal axis during the time when the voltage value shown in FIG. 7 (a) is 0.1 (range from 1 scale to 12 scales on the horizontal axis). Once, the voltage value is 0.3, and on the other scales on the horizontal axis, the voltage value is zero.

FIG. 7 (c) is a signal obtained by superimposing the signal shown in FIG. 7 (a) and the signal shown in FIG. 7 (b).

FIG. 7B shows a superposed signal in which the voltage value becomes 0.3 once on the three scales on the horizontal axis, and the number of scales on the horizontal axis where the voltage value is added once and the voltage value are shown. It can be selected as appropriate.

Hereinafter, unless otherwise specified, the case where the superimposed signal shown in FIG. 7B is used will be described as an example.

FIG. 8 is a conceptual diagram showing a detailed processing flow example of the processing of S101 shown in FIG. 6 performed by the signal generation unit 101 shown in FIG.

When the signal generation unit 101 is the signal generation unit 101b shown in FIG. 3, the subject (recording unit) of recording or holding in the following description is the recording unit 1013 shown in FIG. Further, the processing unit 1012 performs processing other than recording and holding. These are the same in the description of FIG. 9 described later.

First, the signal generation unit 101 reads the ID held by the wireless LAN access point 110 from the recording unit of the signal generation unit 101 as the process of S201. The ID is input in advance in the recording unit.

Next, the signal generation unit 101 converts the ID into a time T, which is a time representing the frame length. The recording unit holds, for example, the correspondence data between the ID and the frame length in advance, and the signal generation unit 101 converts the ID into the time T according to the correspondence data.

Then, as the process of S203, the signal generation unit 101 sets the time t to zero. The time t is the time corresponding to the horizontal axis of FIG. 7 (a).

Then, as the process of S204, the signal generation unit 101 substitutes t + ΔT for t. Here, ΔT is a time corresponding to one scale on the horizontal axis of FIG. 7A.

Then, as the process of S205, it is determined whether the time t is larger than the time T.

If the signal generation unit 101 does not determine in S205 that the time t is larger than the time T, the signal generation unit 101 performs the process of S206.

On the other hand, when the signal generation unit 101 determines in S205 that the elapsed time t is larger than the time T, the signal generation unit 101 ends the process shown in FIG.

When the processing of S206 is performed, the signal generation unit 101 sets the voltage value V at the time t as Vs and records it in the recording unit in association with the time t. Here, Vs is a preset voltage value. For example, in the case of the frame length modulated signal shown in FIG. 7A, Vs is 0.1.

FIG. 9 is a conceptual diagram showing an example of a detailed processing flow of the processing of S102 shown in FIG.

First, as S301, the signal generation unit 101 sets the time t to zero. Here, the time t is the time corresponding to the horizontal axis of FIG. 7 (a).

Next, the signal generation unit 101 substitutes t + ΔT for the time t. Here, ΔT is a time corresponding to one scale on the horizontal axis of FIG. 7A.

Then, as the process of S303, the signal generation unit 101 reads out the voltage value for the time t from the frame length modulated signal created by the process of S101 of FIG.

Then, the signal generation unit 101 records the voltage value V = Vf + Vs in association with the elapsed time t as the process of S305. Here, the voltage value Vs is the voltage value Vs used in the process of S206 of FIG. The voltage value Vs is 0.1 according to the example shown in FIG. 7A. The voltage value Vf is a voltage value added to the frame length modulation signal. The voltage value Vf is 0.3 in FIG. 7 (c). The voltage value Vf is preset.

Then, the signal generation unit 101 substitutes zero for the time t as the process of S306.

Then, the signal generation unit 101 substitutes 1 for n as the process of S306-2. Here, n is a value used in the process of S307 described later.

Then, the signal generation unit 101 substitutes the product of n and ΔT for the time t as the process of S307.

Then, as the process of S308, the signal generation unit 101 reads out the voltage value V for the time t from the frame length modulated signal created by the process of S101 of FIG.

Then, as the process of S309, the signal generation unit 101 determines whether the voltage value V read by the process of S308 is smaller than the voltage value Vs.

When the signal generation unit 101 determines by the process of S309 that the voltage value V is smaller than the voltage value Vs, the signal generation unit 101 ends the process shown in FIG.

On the other hand, if the signal generation unit 101 does not determine that the voltage value V is smaller than the voltage value Vs by the processing of S309, the signal generation unit 101 performs the processing of S310.

When processing S310, the signal generation unit 101 determines whether the time t is an integral multiple of 3ΔT.

When the signal generation unit 101 determines by the processing of S310 that the time t is an integral multiple of 3ΔT, the signal generation unit 101 performs the processing of S311.

On the other hand, if the signal generation unit 101 does not determine that the time t is an integral multiple of 3ΔT by the processing of S310, the processing of S312 is performed.

When the process of S311 is performed, the signal generation unit 101 records the voltage value V = Vf + Vs in association with the time t as the process.

Then, the signal generation unit 101 performs the processing of S313.

When the processing of S312 is performed, the signal generation unit 101 records the voltage value V = Vs in association with the time t as the processing.

Then, the signal generation unit 101 performs the processing of S313.

When the signal generation unit 101 performs the process of S313, n + 1 is substituted for n as the process.

Then, the signal generation unit 101 performs the above-mentioned processing of S307.

FIG. 10 is a conceptual diagram showing a wake-up process performed by the power supply control unit 112 shown in FIG.

When the power supply control unit 112 is the power supply control unit 112b shown in FIG. 5, the subject (recording unit) for recording or holding in the following description is the recording unit 1123 shown in FIG. Further, processing other than recording and holding is performed by the processing unit 1122. These are the same in the description of FIG.

As a premise of the processing shown in FIG. 10, the power supply control unit 112 receives a signal through the antenna 116 every moment in the sleep state, and measures the voltage value of the received signal. Then, it is assumed that the power supply control unit 112 records the received signal in the recording unit.

The process of S400 to S407 described below is a process of obtaining the frame length from the frame length modulated signal on the assumption that the received signal is the frame length modulated signal addressed to the wireless LAN access point 110 shown in FIG. ..

First, the power supply control unit 112 determines whether to end the process shown in FIG. 10 as the process of S400. The power supply control unit 112 makes the determination, for example, by determining whether or not an end signal is input from the outside.

When the power supply control unit 112 determines that the process shown in FIG. 10 is to be completed by the process of S400, the power control unit 112 ends the process shown in FIG.

On the other hand, if the power supply control unit 112 does not determine that the process shown in FIG. 10 is terminated by the process of S400, the process of S401 is performed.

Then, the power supply control unit 112 sets the elapsed time t to zero as the process of S401.

Then, the power supply control unit 112 determines whether the elapsed time t = ΔT has elapsed as the process of S402. Here, ΔT is a time representing a sampling interval. The power supply control unit 112 makes the determination, for example, by using a clock signal input from the outside.

When the power supply control unit 112 determines that the elapsed time t = ΔT has elapsed by the processing of S402, the power supply control unit 112 performs the processing of S403.

On the other hand, if the power supply control unit 112 does not determine that the elapsed time t = ΔT has elapsed due to the processing of S402, the processing of S402 is performed again.

When performing the process of S403, the power supply control unit 112 determines whether the received voltage Vr is smaller than the threshold value Vt1 as the process. The threshold value Vt1 is a value smaller than the reception voltage Vr assumed when the voltage of the wakeup signal transmitted by the wireless LAN terminal 100a is 0.1 as shown in FIG. 8A. However, the threshold value Vt1 is preferably a value large enough to suppress the influence of noise contained in the reception voltage Vr. It is assumed that the threshold value Vt1 is set in advance. The process of S403 is a process performed to determine that the received voltage Vr is not a wake-up voltage when the received voltage Vr is smaller than the threshold value Vt1.

When the power supply control unit 112 determines that the received voltage Vr is smaller than the threshold value Vt1 by the process of S403, the process of S401 described above is performed.

If the power supply control unit 112 does not determine that the received voltage Vr is smaller than the threshold value Vt1 by the processing of S403, the processing of S404 is performed.

When the power control unit 112 performs the process of S404, the elapsed time t is set to zero as the process.

Then, the power supply control unit 112 sets the value of n to 1 as the process of S404a. n is a value used in the processing of S405 and S406a described later.

Then, the power supply control unit 112 determines whether or not the time t = nΔT has elapsed as the process of S405.

When the power supply control unit 112 determines that the time t = nΔT has elapsed by the processing of S405, the power supply control unit 112 performs the processing of S406.

On the other hand, if the power supply control unit 112 does not determine that the time t = nΔT has elapsed due to the processing of S405, the processing of S405 is performed again.

When performing the process of S406, the power supply control unit 112 determines whether the received voltage Vr is smaller than the threshold value Vt1 as the process.

When the power supply control unit 112 determines that the received voltage Vr is smaller than the threshold value Vt1 by the processing of S406, the power supply control unit 112 performs the processing of S407.

On the other hand, if the power supply control unit 112 does not determine that the received voltage Vr is smaller than the threshold value Vt1 by the processing of S406, the processing of S406a is performed.

When the power supply control unit 112 performs the process of S406a, n + 1 is substituted for n as the process.

Then, the power supply control unit 112 performs the process of S405.

On the other hand, when the power supply control unit 112 performs the process of S407, the elapsed time t is substituted into the time TM as the process. The time TM is a value used in the processing of S422 described later.

Then, the power supply control unit 112 performs the processing of S400 and the processing of S408-1.

The processes of S408-1 to S408-3 are processes for determining whether the time TM (frame length) obtained by the process of S407 represents the ID of the power supply control unit 112.

When performing the process of S408-1, the power supply control unit 112 determines whether or not there is an ID corresponding to the time TM. The power supply control unit 112 makes the determination, for example, by referring to the correspondence list of the time TM and the ID held by the recording unit.

It should be noted that the value of the time TM obtained by the processing of No to S407 of S403 may be deviated depending on the timing of determining No of S403. Therefore, the process of determining whether or not there is an ID corresponding to the time TM is a process of determining whether or not there is an ID corresponding to a predetermined range of the time TM. When the determination is made by referring to the correspondence list, the correspondence list is a correspondence list between a predetermined range of time TM and an ID. Then, the range of the time TM corresponding to each of the arbitrary two IDs included in the correspondence list should be set so as not to overlap each other.

When the power supply control unit 112 determines that there is an ID corresponding to the time TM by the process of S408-1, the process of S408-2 is performed.

On the other hand, if the power supply control unit 112 does not determine that there is an ID corresponding to the time TM by the processing of S408-1, the processing after S408-1 at that time is terminated. Here, the description "at that time" means that the processing after S408-1 is started every time the processing of S407 is performed, but the processing after the newly started S408-1 is not completed. The purpose.

When the power control unit 112 performs the process of S408-2, the time TM is converted into an ID as the process.

Then, the power supply control unit 112 determines, as the process of S408-3, whether the ID converted by the process of S408-2 matches the ID of the wireless LAN access point 110 held by the power supply control unit 112 in the recording unit. ..

When the power control unit 112 determines that the ID converted by the process of S408-3 matches the ID of the wireless LAN access point 110, the power control unit 112 performs the process of S410.

On the other hand, if the power control unit 112 does not determine that the ID converted by the process of S408-3 matches the ID of the wireless LAN access point 110, the power control unit 112 ends the process after S408-1 at that time. ..

The processes of S410 to S434 described below are processes of determining whether or not the received signal is a wakeup signal addressed to the wireless LAN access point, and performing wakeup when it is determined that the signal is the wakeup signal. ..

When performing the processing of S410, the power supply control unit 112 reads the latest received voltage in the range of 0 <t <TM held by the recording unit as the same processing.

Then, the power supply control unit 112 identifies the first peak of the received voltage in the latest range of 0 <t <TM as the process of S411. An example of a detailed processing flow for the identification will be described later.

Then, the power supply control unit 112 sets the time of the first peak to time t = 0 as the process of S412.

Then, the power supply control unit 112 determines whether Vr (t) at t = 0 is larger than the threshold value Vt2 as the process of S413. Here, it is assumed that the threshold value Vt2 is predetermined.

When the power supply control unit 112 determines that Vr (0) is larger than the threshold value Vt2 by the process of S413, the process of S421 is performed.

On the other hand, if the power supply control unit 112 does not determine that Vr (0) is larger than the threshold value Vt2 by the processing of S413, the processing after S408-1 at that time is terminated.

When the power supply control unit 112 performs the process of S421, t + 3ΔT is substituted for the elapsed time t as the process.

Then, the power supply control unit 112 determines whether the elapsed time t is smaller than the time TM set in the process of S407 as the process of S422.

When the power supply control unit 112 determines that the elapsed time t is smaller than the time TM by the processing of S422, the power supply control unit 112 performs the processing of S413 described above.

On the other hand, if the power supply control unit 112 does not determine that the elapsed time t is smaller than the time TM by the processing of S422, the power supply control unit 112 performs the processing of S434.

When processing S434, the power supply control unit 112 sends a wake-up signal to the power supply 113 shown in FIG. The power supply 113 that receives the wake-up signal from the power supply control unit 112 starts supplying power to the processing unit 114 and the communication unit 115 shown in FIG.

Then, the power supply control unit 112 ends the processing after S408-1 at that time.

FIG. 11 is a conceptual diagram showing an example of a detailed processing flow of the processing of S411 shown in FIG.

First, as the process of S501, the power supply control unit 112 performs a continuation process for Vr (t) in the range of 0 <t <TM read by the process of S410 shown in FIG. The Vr (t) in the range of 0 <t <TM read out by the processing of S410 is a set of discontinuous Vr (t) associated with the time t for each ΔT. The process of S501 is a continuation process of converting a discontinuous set of Vr (t) into continuous data. The power supply control unit 112 performs, for example, a process of connecting adjacent Vr (t) with a straight line as a process of S501. Alternatively, the power supply control unit 112 may perform a process of obtaining a spline curve for a set of discontinuous Vr (t) as the process of S501. By the continuation process, Vr (t) is expressed by a predetermined formula.

Next, the power supply control unit 112 determines whether Vr (t + ΔT1) −Vr (t) is larger than the threshold value Vt3 as the process of S502. The threshold value Vt3 is a predetermined positive number. Further, the time ΔT1 is a sufficiently short time as compared with the sampling interval ΔT described above.

When the power supply control unit 112 determines that the difference is larger than Vt3 by the processing of S502, the processing of S504 is performed.

On the other hand, if the power supply control unit 112 does not determine that the difference is larger than Vt3 by the processing of S502, the processing of S503 is performed.

When the power supply control unit 112 performs the process of S503, t + ΔT1 is substituted for the time t as the process.

Then, the power supply control unit 112 performs the process of S502.

The power supply control unit 112 substitutes t + ΔT1 for the time t when performing the processing of S504.

Then, the power supply control unit 112 determines whether Vr (t + ΔT1) -Vr (t) is smaller than the threshold value −Vt3 as the process of S505.

When the power supply control unit 112 determines that the difference is smaller than the threshold value −Vt3 by the processing of S505, the power supply control unit 112 performs the processing of S506.

On the other hand, if the power supply control unit 112 does not determine that the difference is smaller than the threshold value −Vt3 by the process of S505, the process shown in FIG. 11 ends.

When the processing of S506 is performed, the power supply control unit 112 specifies Vr (t) at the time of processing (time t) of S506 as the first peak as the processing.

As described above, the wireless LAN system 11 superimposes a frame length modulated signal having a frame length representing the ID of the wireless LAN access point 110 sent by the wireless LAN terminal 100 into the wireless space and a signal having a certain period. Overlay. Then, in addition to determining whether the frame length of the wireless LAN access point 110 is the frame length of the received signal representing the ID of the wireless LAN access point 110, is the signal a superposition of the superimposed signals? To judge. Then, the wireless LAN access point 110 wakes up when the frame length of the received signal represents its own ID and the signal is a superposition of superposition signals. Therefore, the wireless LAN system 11 can suppress the occurrence of canceling the sleep state due to erroneous detection of the ID due to the interruption of the wireless frame of another signal or the like, and can suppress the occurrence of unnecessary power consumption.
[effect]
In the wireless LAN system of the present embodiment, a superimposition signal composed of a signal having a predetermined period is superimposed on a frame length modulation signal whose frame length represents the ID of the wireless LAN access point sent to the wireless space by the wireless LAN terminal. Then, the wireless LAN access point determines whether the frame length of the received signal represents its own ID, and also determines whether the signal is a superposition of superimposed signals. Then, the wireless LAN access point wakes up when the frame length of the received signal represents its own ID and the signal is a superposition of superposition signals. Therefore, the wireless LAN system of the present embodiment can suppress the possibility of canceling the sleep state due to false detection of the ID due to the interruption of the wireless frame of another signal, and can suppress the generation of unnecessary power consumption. ..

In the above, the case where the voltage value of the superimposition signal superimposed on the frame length modulation signal in the wakeup signal periodically increases as compared with the voltage values before and after has been described. However, the superposed signal may be a signal whose voltage value decreases periodically as compared with the voltage values before and after. Further, the superposed signal does not necessarily have to be a periodic signal. Furthermore, the method of creating the wake-up signal is arbitrary as long as the wake-up signal appears to be a superposition signal superimposed on the frame length modulation signal as a result. Further, the wake-up signal may have a frame length other than the above as long as it has a predetermined feature. Further, the feature does not necessarily have to be one, and may be plural. Further, when there are a plurality of the features, it is not always necessary to confirm all of the features for power supply.

FIG. 12 is a conceptual diagram showing the power supply control device 112x, which is the minimum configuration of the power supply control device of the present invention.

The power control device 112x includes a determination unit 1121x and a processing unit 1122x.

The determination unit 1121x determines whether or not the duration of the input signal belongs to a predetermined time range and whether or not any one of at least one predetermined feature of the waveform of the signal is present.

The processing unit 1122x starts supplying electric power to a predetermined circuit (not shown) when both the determination results of the affiliation and the existence are positive.

It should be noted that the time range includes the case where the width of the range is zero.

The processing unit 1122x confirms that the duration of the signal belongs not only to a predetermined time range but also the existence of any one of at least one predetermined feature of the waveform of the signal. Start supplying power to the circuit. Therefore, the power supply control device 112x can suppress the occurrence of erroneous detection of the identification information of the input A signal due to the interruption of another signal due to radio wave interference or the like.

Therefore, the power supply control device 112x exhibits the effects described in the section of [Effects of the Invention] by the above configuration.

Although each embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and further modifications, substitutions, and adjustments can be made without departing from the basic technical idea of the present invention. Can be added. For example, the network configuration and the element configuration shown in each drawing are examples for assisting the understanding of the present invention, and are not limited to the configurations shown in these drawings.

In addition, some or all of the above embodiments may be described as in the following appendix, but are not limited to the following.

(Appendix A1)
A determination unit that determines whether the duration of the input signal belongs to a predetermined time range and whether or not any one of at least one predetermined feature of the waveform of the signal is present.
A processing unit that starts supplying power to a predetermined circuit when both the affiliation / nonexistence determination results are positive
Power control unit equipped with.

(Appendix A1.1)
The power supply control device according to Appendix A1, wherein the duration is the frame length of the frame length modulated signal.

(Appendix A2)
The power supply control device according to Appendix A1.1, wherein the feature is an element included in the superimposed signal superimposed on the frame length modulated signal.

(Appendix A3)
The power supply control device according to Appendix A2, wherein the superposed signal is superposed only on the signal portion of the frame length modulated signal.

(Appendix A4)
The power supply control device according to any one of Supplementary A1 to Supplementary A3, wherein the feature is repeated at predetermined time intervals.

(Appendix A5)
The power supply control device according to any one of Supplementary A1 to Supplementary A4, wherein the feature is a relative increase or decrease of the signal voltage as compared with the signal voltage before and after.

(Appendix A6)
The power control device according to any one of Supplementary A1 to Supplementary A5, wherein the power supply is the supply of power to a predetermined portion of a wireless LAN (Local Area Network) access point.

(Appendix B1)
It is determined whether or not the duration of the input signal belongs to a predetermined time or time range, and whether or not any one of the predetermined at least one characteristics of the waveform of the signal is present. A transmission device that sends a signal to the power supply control device that starts supplying power to a predetermined circuit when the existence / non-existence determination results are both positive, and the existence / non-existence can be positively determined. ..

(Appendix B2)
The transmitting device according to Appendix B1, wherein the signal that can be determined is generated by equipping a frame length modulated signal having a frame length that can be determined to belong with the above characteristics.

(Appendix B3)
The transmitting device according to Appendix B1 or Appendix B2, which is provided in a wireless LAN (Local Area Network) terminal.

(Appendix C1)
A power supply control system including the power supply control device described in any one of Supplementary A1 to A6 and the transmission device described in any one of Supplementary B1 to B3.

(Appendix D1)
It is determined whether the duration of the input signal belongs to a predetermined time or time range, and whether or not any one of at least one predetermined feature of the waveform of the signal is present.
When both the determination result of the affiliation and the existence / nonexistence are positive, the power supply to the predetermined circuit is started.
Power control method.

(Appendix E1)
A process of determining whether or not the duration of an input signal belongs to a predetermined time or time range, and whether or not any one of at least one predetermined feature of the waveform of the signal is present.
A process of starting power supply to a predetermined circuit and a process of starting power supply to a predetermined circuit when both the determination result of the existence or nonexistence is positive.
A power control program that causes a computer to perform processing that includes.

11 Wireless LAN system 100, 100a Wireless LAN terminal 101, 101b Signal generation unit 102, 111, 113 Power supply 103 Communication unit 104, 114, 1012, 1122 x Processing unit 105, 116 Antenna 106 Transmission unit 110, 110a Wireless LAN access point 112, 112b Power control unit 112x Power control device 115 Communication unit 1013, 1123 Recording unit 1121 Reception unit 1121x Judgment unit

Claims (8)

A determination unit that determines whether or not the duration of the input signal belongs to a predetermined time or time range, and whether or not any one of at least one predetermined feature of the waveform of the signal is present.
A processing unit that starts supplying power to a predetermined circuit when both the affiliation / non-existence determination results are positive.
Equipped with a,
The duration is the frame length of the frame length modulated signal.
The feature is an element included in the superimposed signal superimposed on the frame length modulated signal.
Power control unit. The power supply control device according to claim 1 , wherein the superposed signal is superposed only on the signal portion of the frame length modulated signal. The power supply control device according to claim 1 or 2 , wherein the feature is repeated at predetermined time intervals. The power supply control device according to any one of claims 1 to 3 , wherein the feature is a relative increase or decrease of the signal voltage as compared with the signal voltage before and after. Whether or not the duration of the input signal belongs to a predetermined time range and the presence or absence of any one of at least one predetermined feature of the waveform of the signal are determined, and the presence or absence of the signal and the presence or absence of the signal are determined. When all the determination results are positive, a signal that can positively determine the existence or nonexistence is sent to the power supply control device that starts supplying power to the predetermined circuit .
The duration is the frame length of the frame length modulated signal.
The feature is an element included in the superimposed signal superimposed on the frame length modulated signal.
Transmitter. The transmission device according to claim 5 , wherein the signal that can be determined is generated by equipping a frame length modulated signal having a frame length that can be determined to belong to the above characteristics. A power supply control system including the power supply control device according to any one of claims 1 to 4 and a transmission device according to claim 5 or 6 . It is determined whether the duration of the input signal belongs to a predetermined time range and whether or not any one of at least one predetermined feature of the waveform of the signal is present.
When both the affiliation / non-existence determination results are positive, the power supply to the predetermined circuit is started .
The duration is the frame length of the frame length modulated signal.
The feature is an element included in the superimposed signal superimposed on the frame length modulated signal.
Power control method.

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