JPWO2019142417A1 - Power control circuit and electronic equipment - Google Patents

Abstract

Suppress power consumption for standby for reception from the outside. The power supply control circuit that controls the power supply in the electronic device includes a power supply start switch, a receiving unit, a rectifier, and a control circuit. The power start switch is a switch for starting the power supply. The receiving unit receives electromagnetic waves. The rectifier rectifies the electromagnetic wave received by the receiving unit, outputs a rectified signal, and makes the power supply start switch conductive by the rectified signal. The control circuit starts operation by receiving power supply when the power supply start switch becomes conductive.

Description

The present technology relates to an electronic device having a power supply control circuit. More specifically, the present invention relates to a power supply control circuit and an electronic device that wait for receiving a signal from the outside.

An electronic device that waits for receiving a signal from the outside is always in a standby state that consumes power because it does not know when the signal is transmitted. Therefore, for example, a battery-powered wireless device may run out of battery even in a standby state. Therefore, when the battery cannot be replaced or is not easy to replace, reducing the amount of power consumed in the standby state also leads to extending the drive time of the device. As a method for reducing the power consumption in such a standby state, an intermittent reception operation that repeats a receivable state and a non-receivable state for a certain period has been proposed (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2016-001929

In the above-mentioned conventional technique, since there is almost no power consumption in the state of not receiving, the driving time of the wireless device can be extended. However, a circuit for managing the time and a circuit for operating the power supply of the receiving circuit are required, and power is consumed in other than the receiving circuit. Therefore, it is difficult to reduce the standby power for signal reception to zero.

This technology was created in view of such a situation, and aims to suppress the power consumption for waiting for reception from the outside.

The present technology has been made to solve the above-mentioned problems, and the first aspect thereof is a power start switch for starting the power supply, a receiving unit for receiving electromagnetic waves, and the above receiving unit. A rectifier that rectifies the electromagnetic wave received by the device and outputs a rectified signal to make the power supply start switch conductive by the rectified signal, and operates by receiving power supply when the power supply start switch becomes conductive. A power supply control circuit and an electronic device including a control circuit for starting the above. This has the effect of initiating the operation of the control circuit based on the electromagnetic waves received by the receiving unit.

Further, in the first aspect, a power supply maintenance switch connected in parallel with the power supply start switch is further provided, and when the operation is started, the power supply maintenance switch is brought into a conductive state to the control circuit. The power supply may be maintained. This has the effect of maintaining the supply of power to the control circuit after the control circuit is activated.

Further, in the first aspect, when the control circuit does not receive the signal for activating the main body circuit by the electromagnetic wave within a predetermined period, the power supply maintenance switch is turned off and the power supply to the control circuit is supplied. The supply may be stopped. This has the effect of stopping the supply of power to the control circuit when the signal that activates the main circuit is not received.

Further, in the first aspect, the reception control switch for controlling the reception of the signal from the rectifier to the power supply start switch is further provided, and the control circuit provides the reception control after the power supply maintenance switch is made conductive. The power start switch may be turned off by making the switch conductive. This has the effect of stopping the reception of new signals from the receiving unit.

Further, in the first aspect, the capacity is further provided so as to be connected in series with the power supply maintenance switch and to continue the power supply to the control circuit for a certain period of time even after the power supply maintenance switch is disconnected. It may be. This has the effect of stopping the reception of new signals from the receiving unit for a certain period of time even after the power supply maintenance switch is turned off.

Further, in the first aspect, a main body power switch for controlling the power supply of the main body circuit is further provided, and the control circuit uses the main body power switch when the electromagnetic wave is a signal for activating the main body circuit. The power supply to the main body circuit may be started in the conductive state. As a result, the control circuit has the effect of starting the supply of power to the main circuit.

Further, in the first aspect thereof, a second receiving unit for receiving an electromagnetic wave including a control signal to the main body circuit is further provided, and the control circuit follows the control signal received by the second receiving unit. The main body circuit may be controlled. This has the effect of controlling the main circuit according to the control signal received by the second receiving unit.

Further, in the first aspect thereof, a demultiplexer for demultiplexing the electromagnetic wave including the control signal from the electromagnetic wave received by the receiving unit to the main body circuit is further provided, and the control circuit is provided by the demultiplexer. The main body circuit may be controlled according to the demultiplexed control signal. This has the effect of controlling the main circuit according to the control signal demultiplexed by the demultiplexer.

Further, in the first aspect thereof, a distributor for distributing the electromagnetic wave including the control signal from the electromagnetic wave received by the receiving unit to the main body circuit is further provided, and the control circuit is distributed by the distributor. The main body circuit may be controlled according to the control signal. This has the effect of controlling the main circuit according to the control signals distributed by the distributor.

Further, in this first aspect, the rectifier may rectify the electromagnetic wave into a positive signal, and the power supply start switch may be a normally-off type NMOS transistor. Further, the rectifier may rectify the electromagnetic wave into a negative signal, and the power supply start switch may be a normally-off type MOSFET transistor.

Further, in the first aspect, the receiving unit may be an antenna or a coil.

According to the present technology, it is possible to achieve an excellent effect that the power consumption for standby for reception from the outside can be suppressed. The effects described here are not necessarily limited, and may be any of the effects described in the present disclosure.

It is a figure which shows an example of the system configuration in embodiment of this technique. It is a figure which shows an example of the circuit structure of the reception circuit 100 in the 1st Embodiment of this technique. It is a timing diagram which shows the 1st example of the operation of the reception circuit 100 in 1st Embodiment of this technique. It is a timing diagram which shows the 2nd example of the operation of the reception circuit 100 in 1st Embodiment of this technique. It is a figure which shows an example of the circuit structure of the reception circuit 100 in the 2nd Embodiment of this technique. It is a timing diagram which shows the 1st example of the operation of the reception circuit 100 in the 2nd Embodiment of this technique. It is a timing diagram which shows the 2nd example of the operation of the reception circuit 100 in the 2nd Embodiment of this technique. It is a figure which shows an example of the circuit structure of the reception circuit 100 in the 3rd Embodiment of this technique. It is a figure which shows an example of the circuit structure of the reception circuit 100 in 4th Embodiment of this technique. It is a figure which shows an example of the circuit structure of the reception circuit 100 in 5th Embodiment of this technique. It is a figure which shows an example of the circuit structure of the reception circuit 100 in the 6th Embodiment of this technique. It is a timing diagram which shows the operation example of the reception circuit 100 in the 6th Embodiment of this technique.

Hereinafter, embodiments for carrying out the present technology (hereinafter referred to as embodiments) will be described. The explanation will be given in the following order.
1. 1. First Embodiment (Example using two antennas)
2. 2. Second embodiment (example in which one antenna is used by using a demultiplexer)
3. 3. Third Embodiment (Example of reversing the polarity of the rectifier)
4. Fourth embodiment (example of using a demultiplexer by reversing the polarity of the rectifier)
5. Fifth Embodiment (Example in which transistors having different polarities are mixed)
6. Sixth Embodiment (Example in which one antenna is used by using a distributor)

<1. First Embodiment>
[System configuration]
FIG. 1 is a diagram showing an example of a system configuration according to an embodiment of the present technology. In this example, the electronic device 10 and the remote controller 20 are assumed.

The electronic device 10 is a device that operates according to an operation signal from the remote controller 20. The electronic device 10 may be a battery-powered device such as an IoT device. The remote controller 20 is a remote control device for controlling the operation of the electronic device 10. The operation signal from the remote controller 20 to the electronic device 10 is transmitted by electromagnetic waves. Here, electromagnetic waves of various wavelengths such as radio waves and light are assumed. Further, the medium may be a dielectric material other than air. Therefore, for example, a case where millimeter waves are transmitted by a waveguide is also included.

The electronic device 10 includes a main body circuit 400 and a power supply control circuit 300 that supplies power to the main body circuit 400. Here, as the main body circuit 400, for example, a main body portion such as a television receiver (video equipment), an air conditioner (air conditioner), or an audio equipment is assumed.

The power supply control circuit 300 includes a reception circuit 100 and a control circuit 200. The reception circuit 100 is a circuit that receives electromagnetic waves from the remote controller 20 and supplies power to the control circuit 200 and the main body circuit 400 according to the contents thereof. The control circuit 200 is a circuit that controls the power supply to the main body circuit 400.

In this system configuration, when the reception circuit 100 receives an operation signal from the remote controller 20, the reception circuit 100 temporarily supplies power to the control circuit 200. When the control circuit 200 waits for a subsequent operation signal from the remote controller 20 and receives a signal for activating the main body circuit 400, the control circuit 200 instructs the main body circuit 400 to supply power by the control signal to the reception circuit 100. Then, the main body circuit 400 is activated by the control signal for the main body circuit 400.

On the other hand, when the subsequent operation signal from the remote controller 20 is not received, the control circuit 200 instructs the reception circuit 100 to stop the power supply to the control circuit 200 by the control signal. As a result, the control circuit 200 can be stopped in operation, and unnecessary power consumption by the control circuit 200 can be suppressed.

[Circuit configuration]
FIG. 2 is a diagram showing an example of the circuit configuration of the reception circuit 100 according to the first embodiment of the present technology.

The reception circuit 100 according to the first embodiment includes two antennas 111 (# 1) and 112 (# 2), a rectifier 120, a capacity 130 (C1), and a capacity 140 (C2). Further, the reception circuit 100 includes a power supply start switch 150 (M1), a power supply maintenance switch 160 (M2), a main body power supply switch 170 (M3), a reception control switch 180 (M4), and a power supply 190.

Antennas 111 and 112 are devices that receive electromagnetic waves. The antenna 111 receives a signal from the remote controller 20 that triggers the operation of the reception circuit 100. The antenna 112 receives a signal from the remote controller 20 that activates the main body circuit 400. Although an antenna for receiving radio waves is assumed here, a coil or the like for receiving signals by short-range wireless communication (Near Field Communication) may be used. The antenna 111 is an example of the receiving unit described in the claims.

The rectifier 120 is an element that rectifies the electromagnetic wave received by the antenna 111. Here, it is assumed that a positive pulsating current or a direct current is generated from an electromagnetic wave having an AC waveform. The capacitance 140 is a capacitor that smoothes the output of the rectifier 120. As a result, the smoothed positive direct current is supplied to the gate of the power supply start switch 150 and the drain of the reception control switch 180.

The capacity 130 is a capacitor that is charged while power is being supplied to the control circuit 200. As a result, even after the power supply to the control circuit 200 is cut off, the power supply can be continued for a certain period of time.

The power supply 190 is a power supply circuit that supplies power to the control circuit 200 and the main body circuit 400. The power supply by the power supply 190 is controlled by four switches (transistors) described below. That is, the power start switch 150, the power maintenance switch 160, the main body power switch 170, and the reception control switch 180. In this first embodiment, these four transistors are normally-off MOSFET transistors, and in a non-operating state, no current flows and no power is consumed.

The power supply start switch 150 is a transistor for supplying the power supply required for startup to the control circuit 200. The gate of the power start switch 150 is connected to the output of the rectifier 120, and the electromagnetic wave received by the antenna 111 is rectified by the rectifier 120 and its signal voltage is applied, so that the power start switch 150 is in a conductive state. It becomes. When the power supply start switch 150 becomes conductive, power is supplied to the control circuit 200 by the power supply 190. When the control circuit 200 is activated by being supplied with power, a voltage for making the power maintenance switch 160 conductive is applied in order to maintain the power supply state. Further, the control circuit 200 applies a voltage that makes the reception control switch 180 conductive in order to shut off the power supply start switch 150. In this way, the power supply activation switch 150 becomes conductive when the power supply of the control circuit 200 is activated, and supplies the power supply necessary for activation. When the control circuit 200 is activated by being supplied with power, it waits until a signal for activating the main body circuit 400 from the remote controller 20 is received by the antenna 112.

The power supply maintenance switch 160 is a transistor for supplying necessary power to the control circuit 200 after startup. The gate of the power supply maintenance switch 160 is connected to the control circuit 200, and when a voltage is applied from the control circuit 200, the power supply maintenance switch 160 becomes conductive. When the power supply maintenance switch 160 becomes conductive, the power supply to the control circuit 200 by the power supply 190 is maintained even after the power supply start switch 150 is cut off. However, if the signal for starting the main circuit 400 is not received via the antenna 112 within a predetermined period, the control circuit 200 stops applying the voltage to the power supply maintenance switch 160. As a result, the power supply maintenance switch 160 is disconnected and cut off from the power supply. However, even in this case, the power supply is continued for a certain period by the electric power charged in the capacity 130. In this way, whether or not to maintain the power supply to the control circuit 200 is controlled by the control circuit 200 via the power supply maintenance switch 160.

The main body power switch 170 is a transistor for supplying the main body circuit 400 with the power required for operation. The gate of the main body power switch 170 is connected to the control circuit 200, and when a voltage is applied from the control circuit 200, the main body power switch 170 becomes conductive. When the control circuit 200 is activated by being supplied with power, it waits until a signal for activating the main body circuit 400 from the remote controller 20 is received by the antenna 112. Upon receiving the signal for activating the main body circuit 400, the control circuit 200 applies a voltage that makes the main body power switch 170 conductive. When the main body power switch 170 becomes conductive, power is supplied to the main body circuit 400 by the power supply 190.

The reception control switch 180 is a transistor for controlling signal reception from the antenna 111. The gate of the reception control switch 180 is connected to the control circuit 200, and when a voltage is applied from the control circuit 200, the reception control switch 180 becomes conductive. When the reception control switch 180 becomes conductive, the power supply start switch 150 is shut off and does not newly accept the signal from the antenna 111. That is, even if an unwanted electromagnetic wave is input to the antenna 111, the control circuit 200 can be shut down and unnecessary power consumption can be suppressed.

[motion]
FIG. 3 is a timing diagram showing a first example of the operation of the reception circuit 100 according to the first embodiment of the present technology. This first example is an example in which a signal for activating the main circuit 400 is received within a predetermined period.

When the electromagnetic wave is received by the antenna 111, the electromagnetic wave is rectified by the rectifier 120, and the signal voltage is applied to the gate of the power supply start switch 150. As a result, the power supply start switch 150 becomes conductive, power is supplied to the control circuit 200 by the power supply 190, and the control circuit 200 is started.

The control circuit 200 applies a voltage that makes the power supply maintenance switch 160 conductive to the gate of the power supply maintenance switch 160 in order to maintain the power supply state to itself. As a result, the power supply state to the control circuit 200 is maintained regardless of the state of the power start switch 150.

Further, the control circuit 200 applies a voltage that makes the reception control switch 180 conductive to the gate of the reception control switch 180. As a result, the reception control switch 180 becomes conductive, and the signal voltage applied to the gate of the power supply start switch 150 is stopped. Therefore, the power supply start switch 150 is cut off and does not newly accept the signal from the antenna 111.

Then, when the control circuit 200 confirms that the signal for activating the main body circuit 400 is received by the antenna 112, the control circuit 200 applies a voltage that makes the main body power switch 170 conductive to the gate of the main body power switch 170. As a result, the main body power switch 170 becomes conductive, and the main body circuit 400 is supplied with power by the power supply 190.

FIG. 4 is a timing diagram showing a second example of the operation of the reception circuit 100 according to the first embodiment of the present technology. This second example is an example in which the signal for activating the main circuit 400 is not received within a predetermined period.

In this second example as well, as in the first example described above, the control circuit 200 is activated and waits for the antenna 112 to receive a signal for activating the main circuit 400. In this second example, the signal for activating the main circuit 400 cannot be received within a predetermined period, and the control circuit 200 stops applying the voltage to the gate of the power supply maintenance switch 160. As a result, the power supply maintenance switch 160 is disconnected and cut off from the power supply. That is, in this case, power is not supplied to the main body circuit 400.

However, the capacity 130 is charged while the power is being supplied, and the control circuit 200 is continuously supplied with the power for a certain period of time. Therefore, during that time, the voltage application to the gate of the reception control switch 180 continues, and the reception of the signal from the antenna 111 is suppressed.

After that, when the electric charge charged in the capacity 130 is exhausted and the voltage is not applied to the gate of the reception control switch 180, the reception control switch 180 is cut off so that the signal from the antenna 111 can be received again. become.

As described above, in the first embodiment of the present technology, the control circuit 200 is activated by the voltage of the signal received at the antenna 111, and the antenna 112 waits for the signal for activating the main circuit 400 to be received. .. Since the control circuit 200 is completely shut down until it is started, it does not consume standby power. Further, a normal-off type transistor can be used as a switch for receiving a signal and supplying power. As a result, it is possible to wait for signal reception from the remote controller 20 without consuming power.

Further, in a battery-powered device, reduction of standby power leads to extension of drive time, which is compatible with this technology. Further, since the control circuit 200 can be activated by sending an electromagnetic wave for activating the control circuit 200 only when a command is sent from the outside, it is an efficient power supply activation method. Further, since no current always flows through the circuit, it is possible to delay the progress of the change in the characteristics of the transistor and the deterioration of the wiring, which can contribute to the reduction of the failure rate and the extension of the life of the integrated circuit.

<2. Second Embodiment>
In the first embodiment described above, it was assumed that the signal was received by the two antennas. On the other hand, in this second embodiment, it is assumed that the signal is received by one antenna. Since the basic configuration of the system is the same as that of the first embodiment described above, detailed description thereof will be omitted.

[Circuit configuration]
FIG. 5 is a diagram showing an example of the circuit configuration of the reception circuit 100 according to the second embodiment of the present technology.

In the reception circuit 100 according to the second embodiment, the electromagnetic wave is received by one antenna 113 and demultiplexed into two systems by the demultiplexer 114. The demultiplexer 114 is an antenna coupler that demultiplexes electromagnetic waves according to its frequency band. That is, the demultiplexer 114 supplies the frequency band signal used for activating the control circuit 200 to the rectifier 120, and supplies the other frequency band signals to the control circuit 200. Subsequent processing is the same as that of the first embodiment described above. The antenna 113 is an example of the receiving unit described in the claims.

In order to distinguish the electromagnetic waves of the two systems in the demultiplexer 114, it is necessary to perform some modulation on the signal from the remote controller 20. For example, amplitude modulation and frequency modulation are assumed.

[motion]
FIG. 6 is a timing diagram showing a first example of the operation of the reception circuit 100 in the second embodiment of the present technology. In this first example, the signal from the remote controller 20 is modulated, and signals of two different frequency bands for controlling the control circuit 200 and the power supply start switch 150 (M1) are simultaneously transmitted. This is an example. Both signals are transmitted in different frequency bands such as the 1 GHz band and the 500 MHz band. The demultiplexer 114 demultiplexes both signals and supplies one to the input of the rectifier 120 and the other to the input of the control circuit 200. In this example, the signal in the high frequency band is demultiplexed with respect to the rectifier 120, and the signal in the low frequency band is demultiplexed with respect to the control circuit 200, but the high and low frequencies of the frequency band may be reversed. ..

FIG. 7 is a timing diagram showing a second example of the operation of the reception circuit 100 in the second embodiment of the present technology. In this second example, the signal from the remote controller 20 is modulated, and signals of two different frequency bands controlling the control circuit 200 and the power start switch 150 (M1) are transmitted at staggered times. This is an example of when it comes. Also in this case, the demultiplexer 114 demultiplexes both signals and supplies one to the input of the rectifier 120 and the other to the input of the control circuit 200. Similar to the first example described above, the signal in the high frequency band is demultiplexed with respect to the rectifier 120, and the signal in the low frequency band is demultiplexed with respect to the control circuit 200. May be reversed.

As described above, in the second embodiment of the present technology, the signal received by the antenna 113 is demultiplexed into two systems by the demultiplexer 114, and each operation is performed. As a result, one antenna 113 can wait for a signal without consuming power.

<3. Third Embodiment>
In the first embodiment described above, an example in which a normally-off MOSFET transistor is used as the four switches is assumed. On the other hand, in this third embodiment, it is assumed that a normally-off type MOSFET transistor is used. Since the basic configuration of the system is the same as that of the first embodiment described above, detailed description thereof will be omitted.

[Circuit configuration]
FIG. 8 is a diagram showing an example of the circuit configuration of the reception circuit 100 according to the third embodiment of the present technology.

In this example, the power supply start switch 151, the power supply maintenance switch 161 and the main body power supply switch 171 and the reception control switch 181 are normally-off type MOSFET transistors. Therefore, the polarity is opposite to that of the first embodiment described above. Therefore, the polarity of the rectifier 121 is also opposite to that of the first embodiment described above, and a negative pulsating current or a direct current is generated from the electromagnetic wave having an AC waveform.

The power supply start switch 151 becomes conductive when a negative signal voltage is applied from the rectifier 121. As a result, the control circuit 200 is activated to perform the same operation as that of the first embodiment described above. However, the voltage applied to the gates of the power supply maintenance switch 161 and the main body power switch 171 and the reception control switch 181 is a negative voltage.

As described above, according to the third embodiment of the present technology, the normally-off type MOSFET transistor can be used to wait for signal reception from the remote controller 20 without consuming power.

<4. Fourth Embodiment>
In the third embodiment described above, it was assumed that the signal was received by the two antennas as in the first embodiment. On the other hand, in the fourth embodiment, it is assumed that the signal is received by one antenna as in the second embodiment. Since the basic configuration of the system is the same as that of the first embodiment described above, detailed description thereof will be omitted.

[Circuit configuration]
FIG. 9 is a diagram showing an example of the circuit configuration of the reception circuit 100 according to the fourth embodiment of the present technology.

In the third embodiment described above, the reception circuit 100 in the fourth embodiment receives a signal from one antenna 113 and is a demultiplexer in the same manner as in the second embodiment described above. It is split into two systems by 114. As a result, in a circuit configuration using a normally-off type MOSFET transistor, one antenna 113 waits for a signal from the remote controller 20.

As described above, according to the fourth embodiment of the present technology, in the circuit configuration using the normally-off type MOSFET transistor, the signal can be made to stand by by one antenna 113 without consuming the power supply.

<5. Fifth Embodiment>
In the third embodiment described above, normally-off type MOSFET transistors are used in all four switches, but the four switches are a mixture of normally-off type NMOS transistors and normally-off type MOSFET transistors. May be good. In the fifth embodiment, an example in which a normally-off type NMOS transistor is used for the power control switch of the main circuit 400 and a normally-off type MOSFET transistor is used for the other switch, and both are mixed will be described. To do.

[Circuit configuration]
FIG. 10 is a diagram showing an example of the circuit configuration of the reception circuit 100 according to the fifth embodiment of the present technology.

In this example, the power supply start switch 151, the power supply maintenance switch 161 and the reception control switch 181 are normally-off type MOSFET transistors. On the other hand, the main body power switch 170 is a normally-off type NMOS transistor. Then, the rectifier 121 generates a negative pulsating current or a direct current from an electromagnetic wave having an AC waveform.

The power supply start switch 151 becomes conductive when a negative signal voltage is applied from the rectifier 121. As a result, the control circuit 200 is activated to perform the same operation as that of the first embodiment described above. However, the voltage applied to the gates of the power supply maintenance switch 161 and the reception control switch 181 is a negative voltage. On the other hand, the voltage applied to the gate of the main body power switch 170 is a positive voltage.

As described above, according to the fifth embodiment of the present technology, in the circuit in which the normally-off type NMOS transistor and the normally-off type MOSFET transistor are mixed, the signal is received from the remote controller 20 without consuming power. Can wait.

<6. 6th Embodiment>
In the second embodiment described above, the electromagnetic wave is received by one antenna 113 and demultiplexed into two systems by the demultiplexer 114. On the other hand, in the sixth embodiment, an example of distributing a signal by using a distributor is shown.

[Circuit configuration]
FIG. 11 is a diagram showing an example of the circuit configuration of the reception circuit 100 according to the sixth embodiment of the present technology. In the reception circuit 100 according to the sixth embodiment, the electromagnetic wave is received by one antenna 113 and distributed to two systems by the distributor 115. The distributor 115 distributes electromagnetic waves to a plurality of systems. Since the other configurations are the same as those of the second embodiment described above, detailed description thereof will be omitted.

[motion]
FIG. 12 is a timing diagram showing an operation example of the reception circuit 100 according to the sixth embodiment of the present technology. This operation example is an example in which the signal from the remote controller 20 is modulated.

In order to drive the power supply start switch 150 (M1), it is necessary to input a signal having a large amplitude to the rectifier 120. On the other hand, the control circuit 200 that controls the gate voltage of the main body power switch 170 (M3) can demodulate the signal even with a small amplitude, so that a small power distribution is sufficient. Therefore, as shown in the figure, the distributor 115 supplies the rectifier 120 with a signal having a large amplitude, and supplies the control circuit 200 with a signal having a small amplitude. Subsequent processing is the same as that of the first embodiment described above.

In this example, a high frequency band signal is used to drive the power supply start switch 150 (M1), and a low frequency band signal is used in the control circuit 200, but the high and low frequency bands are opposite. You may. Also, the frequency bands do not necessarily have to be different.

As described above, in the sixth embodiment of the present technology, the signal received by the antenna 113 is distributed to the two systems by the distributor 115, and each operation is performed. As a result, one antenna 113 can wait for a signal without consuming power.

The above-described embodiment shows an example for embodying the present technology, and the matters in the embodiment and the matters specifying the invention in the claims have a corresponding relationship with each other. Similarly, the matters specifying the invention within the scope of claims and the matters in the embodiment of the present technology having the same name have a corresponding relationship with each other. However, the present technology is not limited to the embodiment, and can be embodied by applying various modifications to the embodiment without departing from the gist thereof.

It should be noted that the effects described in the present specification are merely examples and are not limited, and other effects may be obtained.

The present technology can have the following configurations.
(1) A power start switch for starting the power supply and
A receiver that receives electromagnetic waves and
A rectifier that rectifies the electromagnetic wave received by the receiving unit, outputs a rectified signal, and makes the power supply start switch conductive by the rectified signal.
A power supply control circuit including a control circuit that receives power supply and starts operation when the power supply start switch becomes conductive.
(2) Further equipped with a power supply maintenance switch connected in parallel with the power supply start switch,
The power supply control circuit according to (1) above, wherein when the operation is started, the power supply maintenance switch is brought into a conductive state to maintain the supply of power to the control circuit.
(3) When the control circuit does not receive a signal for activating the main circuit due to the electromagnetic wave within a predetermined period, the power supply maintenance switch is turned off and the supply of power to the control circuit is stopped. The power supply control circuit according to 2).
(4) A reception control switch for controlling reception of a signal from the rectifier to the power supply start switch is further provided.
The power supply control circuit according to (2) or (3) above, wherein the control circuit turns off the power supply start switch by making the reception control switch conductive after making the power supply maintenance switch conductive.
(5) From (2) to (4), which are connected in series with the power supply maintenance switch and further have a capacity for continuing power supply to the control circuit for a certain period of time even after the power supply maintenance switch is disconnected. ) The power supply control circuit described in any of.
(6) Further equipped with a main body power switch for controlling the power supply of the main body circuit,
When the electromagnetic wave is a signal for activating the main body circuit, the control circuit makes the main body power switch conductive and starts supplying power to the main body circuit (1) to (5). The power supply control circuit described in either.
(7) Further provided with a second receiving unit for receiving an electromagnetic wave including a control signal to the main circuit.
The power supply control circuit according to any one of (1) to (5), wherein the control circuit controls the main body circuit according to the control signal received by the second receiving unit.
(8) Further provided with a demultiplexer for demultiplexing the electromagnetic wave including the control signal from the electromagnetic wave received by the receiving unit to the main body circuit.
The power supply control circuit according to any one of (1) to (6), wherein the control circuit controls the main body circuit according to the control signal demultiplexed by the demultiplexer.
(9) Further provided with a distributor for distributing the electromagnetic wave including the control signal from the electromagnetic wave received by the receiving unit to the main body circuit.
The power supply control circuit according to any one of (1) to (6), wherein the control circuit controls the main body circuit according to the control signal distributed by the distributor.
(10) The rectifier rectifies the electromagnetic wave into a positive signal.
The power supply control circuit according to any one of (1) to (8) above, wherein the power supply start switch is a normally-off type NMOS transistor.
(11) The rectifier rectifies the electromagnetic wave into a negative signal.
The power supply control circuit according to any one of (1) to (8) above, wherein the power supply start switch is a normally-off type MOSFET transistor.
(12) The power supply control circuit according to any one of (1) to (11) above, wherein the receiving unit is an antenna.
(13) The power supply control circuit according to any one of (1) to (11), wherein the receiving unit is a coil.
(14) Main circuit and
The main body power switch that controls the power supply of the main body circuit and
A power start switch to start the power supply and
A receiver that receives electromagnetic waves and
A rectifier that rectifies the electromagnetic wave received by the receiving unit, outputs a rectified signal, and makes the power supply start switch conductive by the rectified signal.
When the power supply start switch becomes conductive, the power is supplied to start the operation, and when the electromagnetic wave is a signal for activating the main body circuit, the main body power switch is made conductive and the main body is started. An electronic device including a control circuit that starts supplying power to the circuit.

10 Electronic equipment 20 Remote controller 100 Reception circuit 111-113 Antenna 114 Demultiplexer 120, 121 Rectifier 130, 140 Capacity 150, 151 Power start switch 160, 161 Power maintenance switch 170, 171 Main unit power switch 180, 181 Reception control switch 190 Power supply 200 Control circuit 300 Power supply control circuit 400 Main unit circuit

Claims (14)

A power start switch to start the power supply and
A receiver that receives electromagnetic waves and
A rectifier that rectifies the electromagnetic wave received by the receiving unit, outputs a rectified signal, and makes the power supply start switch conductive by the rectified signal.
A power supply control circuit including a control circuit that receives power supply and starts operation when the power supply start switch becomes conductive. A power maintenance switch connected in parallel with the power start switch is further provided.
The power supply control circuit according to claim 1, wherein when the operation is started, the power supply maintenance switch is made conductive to maintain the supply of power to the control circuit. The second aspect of claim 2, wherein when the control circuit does not receive a signal for activating the main circuit due to the electromagnetic wave within a predetermined period, the power supply maintenance switch is turned off and the supply of power to the control circuit is stopped. Power control circuit. A reception control switch for controlling reception of a signal from the rectifier to the power supply start switch is further provided.
The power supply control circuit according to claim 2, wherein the control circuit turns off the power supply start switch by making the reception control switch conductive after making the power supply maintenance switch conductive. The power supply control circuit according to claim 2, further comprising a capacity of being connected in series with the power supply maintenance switch and continuing power supply to the control circuit for a certain period of time even after the power supply maintenance switch is disconnected. It is further equipped with a main body power switch that controls the power supply of the main body circuit.
The power supply control circuit according to claim 1, wherein when the electromagnetic wave is a signal for activating the main body circuit, the control circuit makes the main body power switch conductive and starts supplying power to the main body circuit. It further includes a second receiver that receives electromagnetic waves including control signals to the main circuit.
The power supply control circuit according to claim 1, wherein the control circuit controls the main body circuit according to the control signal received by the second receiving unit. A demultiplexer for demultiplexing an electromagnetic wave including a control signal from the electromagnetic wave received by the receiving unit to the main body circuit is further provided.
The power supply control circuit according to claim 1, wherein the control circuit controls the main body circuit according to the control signal demultiplexed by the demultiplexer. Further, a distributor for distributing the electromagnetic wave including the control signal from the electromagnetic wave received by the receiving unit to the main body circuit is provided.
The power supply control circuit according to claim 1, wherein the control circuit controls the main body circuit according to the control signal distributed by the distributor. The commutator rectifies the electromagnetic wave into a positive signal.
The power supply control circuit according to claim 1, wherein the power supply start switch is a normally-off type NMOS transistor. The commutator rectifies the electromagnetic wave into a negative signal and
The power supply control circuit according to claim 1, wherein the power supply start switch is a normally-off type MOSFET transistor. The power supply control circuit according to claim 1, wherein the receiving unit is an antenna. The power supply control circuit according to claim 1, wherein the receiving unit is a coil. Main circuit and
The main body power switch that controls the power supply of the main body circuit and
A power start switch to start the power supply and
A receiver that receives electromagnetic waves and
A rectifier that rectifies the electromagnetic wave received by the receiving unit, outputs a rectified signal, and makes the power supply start switch conductive by the rectified signal.
When the power supply start switch becomes conductive, the power is supplied to start the operation, and when the electromagnetic wave is a signal for activating the main body circuit, the main body power switch is made conductive and the main body is started. An electronic device including a control circuit that starts supplying power to the circuit.

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