JP2011082653A - Wireless power supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wireless power supply device that quickly responds to changes in load. <P>SOLUTION: The wireless power supply device includes: a wireless power feeder 104b that wirelessly feeds power; a wireless communication unit 103b that transmits a video signal; and a power feeding control unit 108b that controls power to be fed in accordance with the transmitted video signal in the communication unit 103b. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a wireless power supply apparatus that controls power supply in wireless power transmission according to a video signal.

  Currently, wireless power transmission technology for supplying power to devices wirelessly without using wires is put into practical use in various devices.

  Also in digital television, with the recent reduction in thickness, weight, and wireless transmission of video signals and the like, layout-free has progressed, and there is a demand for power supply by wireless power transmission.

  In order to efficiently supply power to the digital television by wireless power transmission, it is necessary to change the power supply power according to the load status of the digital television.

  On the other hand, in patent document 1, the load condition on the power receiving side in wireless power transmission is detected, and the detection result is transmitted to the power feeding side by wireless communication. The power feeding side controls the power feeding power according to the detection result received from the power receiving side. Thereby, it is possible to perform power feeding according to the load on the power receiving side.

JP 2007-336788 A

  However, in the prior art disclosed in the above patent document, the power receiving side detects the load situation and feeds it back to the power feeding side using wireless communication. For this reason, there exists a subject that the response speed of the electric power feeding side with respect to the fluctuation | variation of load becomes slow.

  For example, when the load on the power receiving side suddenly fluctuates from a light load to a heavy load, there is a period in which the power required by the power receiving side cannot be supplied. As a result, there is a possibility that the device on the power receiving side cannot perform normal operation.

  Therefore, an object of the present invention is to improve the response speed of a wireless power feeding apparatus that controls the power feeding according to the load fluctuation of a device on the power receiving side.

  In order to solve the above-described problems, the present invention provides a power feeding unit that wirelessly feeds power, a transmission unit that transmits a video signal, and a video signal that is transmitted by the transmission unit. It has the electric power feeding control means controlled according to it, It is characterized by the above-mentioned.

  According to the present invention, it is possible to increase the response speed with respect to load fluctuations.

It is a block diagram which shows schematic structure of the television broadcast receiving system concerning the 1st Example of this invention. It is a control flow concerning the 1st example of the present invention. It is a block diagram which shows schematic structure of the television broadcast receiving system concerning the 2nd Example of this invention. It is a control flow at the time of the electric power feeding efficiency calculation concerning the 2nd Example of this invention. It is a control flow concerning the 2nd example of the present invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this embodiment, an STB (Set Top Box) and a display are configured as a television broadcast receiving system, and the STB supplies power to the display by wireless power transmission. In particular, self-luminous devices such as SED (Surface-conduction Electron-emitter Display), PDP (Plasma Display Panel) and OEL (Organic Electro-Luminescence), and LCD (Liquid Crystal Display) also use LED (Light Emitting Diode) backlights. This is an example of using a display whose power consumption varies depending on the display image, such as controlling the backlight for each region. ("SED" is a registered trademark)

  Hereinafter, a television broadcast receiving system according to the first embodiment of the present invention will be described with reference to FIG.

  FIG. 1 is a basic block diagram of a television broadcast receiving system in the first embodiment of the present invention.

  A display 100a in the illustrated television broadcast receiving system includes a display unit 101a, a CPU 102a, a bus 103a, a wireless communication unit 104b, and a wireless power receiving unit 105a.

  The STB 100b in the illustrated television broadcast receiving system includes a speaker 101b, an amplifier 102b, a wireless communication unit 103b, a wireless power supply unit 104b, a tuner 105b, a video / audio signal processing unit 106b, an APL (Average Picture Level) calculation unit 107b, and a power supply. A power control unit 108b, an image processing unit 109b, a CPU 110b, a remote control light receiving unit 111b, a bus 112b, and a remote control 113b are provided.

  The CPU 102a and CPU 110b are central processing units that respectively control the display 100a and the STB 100b in the television broadcast receiving system.

  The remote control light receiving unit 111b receives an operation command from the user for the remote control 113b and transfers it to the CPU 110b. The CPU 110b processes the transferred operation command and determines the operation of the STB 100b. The user's operation command is issued not only from the remote control 113b but also from a plurality of switches (not shown) mounted on the STB 100b. In this case, the CPU 110b determines the operation by a switch operated by the user.

  The tuner 105b receives video and audio signals via a terrestrial antenna (not shown) or a parabona antenna (not shown) under the control of the CPU 110b. The video / audio processing unit 106b demodulates and decodes the video signal and the audio signal.

  The amplifier 102b amplifies the audio signal demodulated and decoded by the video / audio processing unit 106b, and the speaker 101b outputs the audio signal amplified by the amplifier 102b.

  The image processing unit 109b performs image processing such as gamma correction on the video signal demodulated and decoded by the video / audio signal processing unit under the control of the CPU 110b.

  The wireless communication unit 103b wirelessly communicates the video signal subjected to the image processing by the image processing unit 109b to the display 100a under the control of the CPU 110b.

  The wireless communication unit 103b performs bidirectional communication with the wireless communication unit 104a under the control of the CPU 110b.

  The APL calculation unit 107b calculates an APL for each field or each frame from the video signal subjected to the image processing by the image processing unit 109b. Here, APL is the average luminance of the video signal.

  Under the control of the CPU 110b, the power supply power control unit 108b controls the power supplied to the display 100a according to the APL for each field or frame calculated by the APL calculation unit 107b.

  The wireless power feeding unit 104b transmits the power controlled by the feeding power control unit 108b to the display 100a.

  The wireless communication unit 104a receives the video signal wirelessly transmitted from the wireless communication unit 103b and outputs it to the display unit 101a under the control of the CPU 102a. The display unit 101a displays the video signal output from the wireless communication unit 104a.

  Further, the wireless communication unit 104a performs bidirectional communication with the wireless communication unit 103b under the control of the CPU 102a.

  The wireless power receiving unit 105a receives wireless power from the wireless power feeding unit 104b and supplies power to the display unit 101a, the CPU 102a, and the wireless communication unit 104a.

The power supply to the STB 100b including the wireless power supply power to the display 100a is supplied from a commercial power outlet via a power cord. (Not shown)
Next, a description will be given of power supply control to the display 100a performed by the power supply control unit 108b according to the first embodiment of the present invention.

  The feed power control unit 108b has data obtained by previously measuring the power consumption of the display 100a for each APL in the video signal displayed on the display unit 101a as an index for determining the feed power to the display 100a. Based on this data, the feed power control unit 108b controls the feed power to the display 100a according to the APL for each field or frame calculated by the APL calculation unit 107b.

  Further, the feeding power control unit 108b controls the feeding start time of the wireless power feeding unit 104.

  This is performed in order to match the timing at which the wireless power receiving unit 105a receives the feeding power determined according to the APL and the timing at which the field or frame of the video signal for which the APL is calculated is displayed on the display unit 101a.

  Thereby, the power required for the display 100a can be supplied from the wireless power supply unit 104b for each field or frame displayed on the display unit 101a.

  Next, the control flow of the television broadcast receiving system according to the first embodiment of the present invention will be described with reference to FIGS.

  First, the control flow of the STB 100b in the television broadcast receiving system will be described.

  S201 proceeds to S202 when receiving a STB power ON instruction by a user operating a remote control 113b or a switch (not shown) mounted on the STB 100b.

  In step S202, when the wireless power feeding unit 104b starts to supply power at startup required when starting the display 100a, the process proceeds to step S203.

  In S203, when the wireless communication unit 103b transmits an activation instruction for activating the display 100a, the process proceeds to S204.

  In step S204, it is determined whether an activation completion notification is received from the display 100a via the wireless communication unit 103b. When it is determined as NO, it waits in this state until it receives a notification of activation completion from the display 100a. If it is determined that the activation completion notification has been received from the display 100a, the process proceeds to S205.

  S205 outputs the video signal received by the tuner 105b and demodulated / decoded by the video / audio signal processing unit 106b. When the video signal is input to the image processing unit 109b, the process proceeds to S206.

  In S206, when the image processing unit 109b outputs the video signal subjected to the image processing, the process proceeds to S207 and S210.

  In S207, when the APL calculation unit 107b calculates the APL for each field or frame of the video signal that has been subjected to the image processing by the image processing unit 109b, the process proceeds to S208.

  In S208, when the power supply control unit 108b determines the power to be supplied to the display 100a according to the APL calculated by the APL calculation unit 107b, the process proceeds to S209.

  In S209, when the wireless power feeding unit 104b feeds the feeding power determined by the feeding power control unit 108b to the display 100a, the process proceeds to S211.

  In S210, when the wireless communication unit 103b transmits the video signal subjected to the image processing by the image processing unit 109b to the display 100a, the process proceeds to S211.

  S211 determines whether an STB power-off instruction has been received by the user operating the remote control 113b or a switch (not shown) mounted on the STB 100b. If NO is determined, the process returns to S205 to repeat the above operation. If it is determined that the STB power OFF instruction has been received from the user, the process proceeds to S212.

  In step S212, when the wireless communication unit 103b stops transmitting the video signal, the process proceeds to step S213.

  If the wireless power supply unit 104b supplies the stop-time power necessary for the display 100a to perform the stop process to the display 100a, the process proceeds to S214.

  If the wireless communication unit 103b transmits a stop instruction to the display 100a, the process proceeds to S215.

  In S215, it is determined whether the wireless communication unit 103b has received a stop completion notification from the display 100a. When it is determined as NO, it waits in this state until a stop completion notification is received from the display 100a. If it is determined that the stop completion notification is received from the display 100a, the process proceeds to S216.

  In S216, the wireless power supply unit 104b stops supplying power to the display 100a and turns off the STB power. This completes the control.

  Next, a control flow of the display 100a in the television broadcast receiving system will be described.

  In S217, when the wireless power receiving unit 105a receives the power necessary for starting the display 100a from the wireless power feeding unit 104b of the STB 100b, the process proceeds to S218.

  In step S218, it is determined whether a display activation instruction from the STB 100b is received via the wireless communication unit 104a. When it is determined as NO, it waits in this state. If it is determined that a display activation instruction has been received from the STB 100b, the process proceeds to S219.

  S219 receives the display activation instruction from the STB 100b, and when the display 100a is activated, the process proceeds to S220. If the wireless communication unit 104a transmits the activation completion notification of the display 100a to the STB 100b, the process proceeds to S221.

  If the wireless communication unit 104a receives the video signal transmitted from the STB 100b, the process proceeds to S222.

  In S222, when the video signal received from the display 100a is output by the display unit 101a, the process proceeds to S223.

  S223 determines whether a display stop instruction is received from the STB 100b via the wireless communication unit 104a. If a display stop instruction is received from the STB 100b, the process proceeds to S224, and if not, the process returns to S221.

  In S224, when the display stop instruction is received from the STB 100b and the display is stopped, the process proceeds to S225.

  S225 transmits a stop completion notification to the STB 100b via the wireless communication unit 104a.

  This completes the display control flow.

  As described above, according to the first embodiment of the present invention, the power supplied to the display 100a is controlled by the APL of the video signal transmitted to the display 100a, thereby accelerating the responsiveness to the power consumption fluctuation of the display 100a. be able to.

  Next, a second embodiment of the present invention will be described with reference to FIG. 3, FIG. 4, and FIG.

  In the wireless power transmission, when the ratio of the power that can be received by the power receiving unit in the power supplied by the power feeding unit is considered as the power feeding efficiency, the power feeding efficiency is considered to change depending on the positional relationship between the power feeding unit and the power receiving unit. For example, the power feeding efficiency decreases as the distance between the power feeding unit and the power receiving unit increases. Therefore, the second embodiment of the present invention shows a television broadcast receiving system capable of performing a desired operation even when the power supply efficiency is lowered.

  FIG. 3 is a basic block diagram of a television broadcast receiving system in the second embodiment of the present invention.

  The display 100a in the illustrated television broadcast receiving system is the same as that of the first embodiment of the present invention.

  In addition, the STB 300b in the illustrated television broadcast receiving system is provided with a power supply efficiency calculating unit 301b in addition to the configuration in the first embodiment of the present invention.

  The power supply efficiency calculation unit 301b calculates power supply efficiency under the control of the CPU 110b.

  Next, a power supply efficiency calculation method according to the second embodiment of the present invention will be described.

  The power supply efficiency calculation unit 301b calculates the power supply efficiency using the power necessary for starting the display 100a and the value of the power supplied by the wireless power supply unit 104b to actually start the display 100a.

  The power supply efficiency calculation unit 301b has power necessary for starting up the display 100a as start-up power information. Further, the value of the feed power fed by the wireless power feed unit 104b to actually activate the display 100a is acquired from the feed power control unit 108b that controls the wireless power feed unit 104b.

  Next, a description will be given of the power supply control to the display 100a performed by the power supply control unit 108b according to the second embodiment of the present invention.

  Similarly to the first embodiment of the present invention, the feed power control unit 108b controls the feed power to the display 100a according to the APL for each field or each frame calculated by the APL calculation unit 107b. Furthermore, the feed power is added to the feed power determined according to the APL so that the power required by the display 100a can be received. The value to be added is determined according to the power supply efficiency calculated by the power supply efficiency calculation unit 301b. For example, when the power supply efficiency calculated by the power supply efficiency calculation unit 301b is 80% (0.8) and the power supply determined according to the APL is 100 W, 125 W that is a value obtained by dividing the power supply determined according to the APL by the power supply efficiency is added. It is the electric power supply including the value to do.

  Next, a control flow of the television broadcast receiving system according to the second embodiment of the present invention will be described with reference to FIGS.

  First, with reference to FIGS. 3 and 4, the control flow at the time of calculating the power supply efficiency in the television broadcast receiving system according to the second embodiment of the present invention will be described. The power supply efficiency is measured when the system is started.

  First, the control flow of the STB 300b will be described.

  S401, S402 and S403 are the same control flow as S201, S202 and S203 in the first embodiment of the present invention.

  In step S405, it is determined whether an activation completion notification is received from the display 100a via the wireless communication unit 103b. If NO is determined, the process proceeds to S404. When the activation completion notification is received from the display 100a, the process proceeds to S406.

  In S404, when the power supplied by the wireless power feeding unit 104b is increased under the control of the wireless power control unit 108b, the process returns to S403. For example, the rate of increase in the feed power is about 1 to 5% of the current feed power. This is repeated until a startup completion notification is received from the display 100a.

  In S406, the power supply efficiency calculation unit 301b calculates the power supply efficiency. This ends the control flow.

  Next, a control flow of the display 100a in the television broadcast receiving system will be described.

  In S407, when the wireless power feeding unit 105a receives the feeding power from the wireless power feeding unit 104b, the process proceeds to S408.

  In step S408, it is determined whether the power received by the wireless power feeding unit 105a has reached the power necessary for starting the display. If the power necessary for the activation is received, the process proceeds to S409. If it is determined that the power is necessary, the process waits in this state until the power necessary for the activation is received.

  In step S409, it is determined whether a display activation instruction is received from the STB 300b via the wireless communication unit 104a. If a display activation instruction is received, the process proceeds to S410. If NO is determined, the process waits in this state until a display activation instruction is received from the STB 300b.

  When S410 receives the display activation instruction from the STB 300b and activates the display 100a, the process proceeds to S411. S411 transmits an activation completion notification to the STB 300b via the wireless communication unit 104a. This ends the control flow.

  Next, a control flow of the television broadcast receiving system according to the second embodiment of the present invention will be described with reference to FIGS.

  First, the control flow of the STB 300b will be described.

  If S501 calculates start-up and power supply efficiency, it will progress to S502. The start-up and power supply efficiency calculation are performed by the control flow of the STB 300b at the time of power supply efficiency calculation described with reference to FIGS.

  The flow after S502 is the same flow as the flow after S205 in the first embodiment of the present invention.

  Next, the control flow of the display 100a will be described.

  If S514 calculates the start-up and power supply efficiency, the process proceeds to S515. The start-up and power supply efficiency calculation are performed by the control flow of the display 100a at the time of power supply efficiency calculation described with reference to FIGS.

  The flow after S515 is the same flow as the flow after S221 in the first embodiment of the present invention.

  As described above, according to the second embodiment of the present invention, even when the distance between the STB 300b and the display 100a is long and the power supply efficiency is reduced, the power supply efficiency is calculated, and power is supplied according to the calculated power supply efficiency. Thus, it is possible to supply power necessary for the display 100a to operate normally.

100a display
101a Display
102a CPU
103a bus
104a Wireless communication unit
105a Wireless power receiver
100b STB in the first embodiment of the present invention
101b speaker
102b amplifier
103b Wireless communication unit
104b Wireless power feeder
105b tuner
106b Video / audio processor
107b APL calculator
108b Feeding power controller
109b Image processor
110b CPU
111b Remote receiver
112b bus
113b remote control
300b STB in the second embodiment of the present invention
301b Power supply efficiency calculator

Claims (4)

Power supply means for supplying power wirelessly;
A transmission means for transmitting a video signal;
Power supply control means for controlling the power supplied by the power supply means according to the video signal transmitted by the transmission means;
A wireless power feeder characterized by comprising: The power supply control means controls power supply power according to an average luminance level of a video signal transmitted by the transmission means;
The wireless power feeder according to claim 1. Power supply means for supplying power wirelessly;
A transmission means for transmitting a video signal;
Power supply control means for controlling the power supplied by the power supply means according to the video signal transmitted by the transmission means;
Power supply efficiency calculating means for calculating power supply efficiency;
A wireless power feeder characterized by comprising: The power supply control means controls power supply power according to an average luminance level of a video signal transmitted by the transmission means;
The wireless power feeder according to claim 3.

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