JP2010117789A - Electronic apparatus - Google Patents

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JP2010117789A
JP2010117789A JP2008289103A JP2008289103A JP2010117789A JP 2010117789 A JP2010117789 A JP 2010117789A JP 2008289103 A JP2008289103 A JP 2008289103A JP 2008289103 A JP2008289103 A JP 2008289103A JP 2010117789 A JP2010117789 A JP 2010117789A
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power supply
external device
power
condition
external
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JP2008289103A
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Japanese (ja)
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Toshiyuki Watanabe
俊之 渡邉
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Sharp Corp
シャープ株式会社
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Priority to JP2008289103A priority Critical patent/JP2010117789A/en
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Abstract

In an electronic device having a function of supplying power to an external device through a power supply terminal, an overcurrent is caused by an unexpected external device being connected without impairing the freedom of connection of the external device. It can prevent damage or abnormal overheating due to overvoltage.
A connection detection circuit detects that a power supply terminal is connected to a power-supplied device Y1 and Y2, and external device candidate information D1 stored in advance in an EEPROM 22 is supplied through a DDC terminal 1d. When the power supply permission condition that the candidate for the external device corresponding to the EDID acquired from the power supply side devices Y1 and Y2 is satisfied, the microcomputer 21 outputs the DC power from the external power supply circuit to the power supply terminal 2a. When the power supply permission condition is not satisfied, the output of DC power from the external power supply circuit to the power supply terminal 2a is stopped.
[Selection] Figure 2

Description

  The present invention relates to an electronic device having a function of supplying power to an external device through a power supply terminal.

In recent years, major electronic devices such as television receivers and peripheral electronic devices such as recording devices (hereinafter referred to as external devices) are connected through a communication interface, and the whole is often used as an AV system or the like. It has become.
For example, recent television receivers are increasingly equipped with an HDMI interface as a means for transmitting signals to and from external devices such as recording / playback apparatuses.
The HDMI interface is one of means for performing signal transmission between a television receiver (a typical example of a television receiver) and a recording / playback device, a set top box (STB), or the like, as disclosed in Patent Document 1, for example. It is a signal transmission means compliant with the HDMI standard. This HDMI interface can simultaneously transmit a digital video signal and an audio signal by a cable combined in appearance, and can realize simple wiring and signal transmission without deterioration. Here, the HDMI interface transmits unencoded (uncompressed) video signals and audio signals (transmitted by the baseband method), so it is not affected by the difference in the signal encoding method between devices. It is excellent in reliability and durability (possibility to be able to connect to a device that adopts a new encoding method in the future).
The HDMI standard further defines the CEC (Consumer Electronics Control) standard, and the HDMI interface is a signal transmission means including a signal transmission line (hereinafter referred to as a CEC line) compliant with the CEC standard. Composed. The HDMI interface including the CEC line can transmit other information (such as control information) through the CEC line in addition to the transmission of the video signal and the audio signal. Note that the HDMI interface can transmit video signals and audio signals only in one direction, but information transmission through the CEC line is possible in both directions.

Further, in Patent Document 2, when a video / audio output device is connected to an external device such as an AV amplifier device, EDID (Extended Display Identification Data) is acquired from the external device, and the ID in the EDID is stored in advance. If it matches the registered ID, it indicates that the video and audio format to be output to the connected external device is set based on the video and audio format information stored together with the registered ID. Has been.
As a result, when the connection of the external device to the video / audio output device is changed, the user is not required to re-set the video / audio format each time.
On the other hand, an electronic device such as a set top box (STB) equipped with a television receiver or a tuner has a function of supplying electric power (generally, direct current power) to an external device through a predetermined power supply terminal. There is. Such an electronic device is usually provided with a power supply connector including the power supply terminal as part of the pin assignment, and supplies power to an external device through a power supply cable connected to the connector. To do. This eliminates the need for peripheral electronic devices connected to main electronic devices to include a power cord for inputting power from a commercial power source, an AC / DC converter, or the like. As a result, the wiring of the power cord is simplified, and the redundancy of parts as a whole system is reduced, and the device configuration is simplified.
JP 2004-208290 A JP 2005-175570 A

However, when an unexpected peripheral electronic device is connected to a major electronic device with a power supply cable, depending on the device specifications such as the rated voltage, power consumption, and input impedance of the peripheral electronic device, There has been a problem in that one or both of the electronic devices can be damaged or overheated due to overcurrent, overvoltage, or the like.
On the other hand, in major electronic devices, if the shape of the connector to which the power supply cable is connected differs depending on the device specifications of the surrounding electronic devices, electrical problems are unlikely to occur, but connectable electronics There is a problem that the degree of freedom of the system configuration is remarkably limited due to the limitation of the equipment.
Accordingly, the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a degree of freedom in connection of external devices in an electronic device having a function of supplying power to external devices through a power supply terminal. It is an object of the present invention to provide an electronic device that can prevent damage or abnormal overheating due to overcurrent, overvoltage, etc. due to connection of an unexpected external device without damaging the device.

In order to achieve the above object, an electronic apparatus according to the present invention includes the components shown in the following (1) to (5).
(1) External power supply means for supplying power to an external device through a power supply terminal.
(2) Power supply connection detection means for detecting whether or not the power supply terminal is connected to the external device.
(3) Model information acquisition means for acquiring model information representing the type of the external device from the external device.
(4) External device candidate information storage means for storing the model information candidates for the external device candidates.
(5) The power supply connection detection unit detects that the power supply terminal is connected to the external device, and the model information acquisition unit acquires the storage information of the external device candidate information storage unit When the power supply permission condition that the candidate for the external device corresponding to the model information exists is satisfied, power is output from the external power supply means to the power supply terminal, and when the power supply permission condition is not satisfied, Power supply control means for stopping output of power from the external power supply means to the power supply terminal.

An electronic device (such as a television receiver or a set-top box) according to the present invention has a function of supplying power to an external device through a power supply terminal, and the power supply terminal is connected to the external device. However, the model information acquired from the connected external device is not stored in the storage means (the external device candidate information storage means) of the electronic device, that is, the external device is not a pre-registered electronic device. In such a case, the power supply permission condition is not satisfied, and power is not supplied to the external device. Therefore, according to the electronic device according to the present invention, it is possible to prevent the unexpected external device from being connected to cause damage or abnormal overheating due to overcurrent or overvoltage.
Further, it is conceivable that the external device candidate information storage means stores the model information candidate and information related to the power supply condition associated therewith. In this case, the electronic device according to the present invention further includes a component shown in the following (6).
(6) The power supply condition is satisfied when the power supply condition is satisfied according to information on the power supply condition corresponding to the model information acquired by the model information acquisition unit in the storage information of the external device candidate information storage unit. Power output operation condition setting means for setting an operation condition when power is output to the terminal.
As a result, the electronic device according to the present invention can set operating conditions according to the specifications of the external device even when the specifications of the external device that can be connected are different, and impairs the degree of freedom of connection of the external device. There is nothing.
For example, the power output condition is such that the operating condition is one or both of the output voltage of the external power supply means and the current limit level in the overcurrent protection means for limiting the current output through the power supply terminal. It may be included.

In addition, it is preferable that the electronic device according to the present invention further includes components shown in the following (7) and (8).
(7) Power supply condition information acquisition means for acquiring information related to the power supply condition for the external device from the external device.
(8) The model information acquired by the model information acquisition unit and the information on the power supply condition acquired by the power supply condition information acquisition unit are associated with each other in the external device candidate information storage unit as a new candidate. External device candidate information registration means for storing.
Thereby, the types of external devices that can be connected can be increased as needed, and highly scalable electronic devices can be realized.
Further, the operating condition is a condition of the set temperature in the control means for controlling the drive of the ventilation fan according to the condition whether or not to drive the ventilation fan or the comparison result between the temperature detected by the temperature detection means and the set temperature. It is also possible to include either.
Thereby, the electronic device according to the present invention can appropriately operate the ventilation fan so that the temperature in the device does not become an excessive temperature according to the power consumption of the external device.
In addition, it is conceivable that the electronic apparatus according to the present invention further includes a component shown in the following (9).
(9) Notification means for performing a predetermined notification when the power supply connection detection means detects that the power supply terminal is connected to the external device and the power supply permission condition is not satisfied.
Accordingly, it is possible to prevent a user who has connected the external device to the electronic device from misidentifying that the power is not supplied to the external device as an abnormal state.

  According to the present invention, in an electronic device having a function of supplying power to the external device through the power supply terminal, an unexpected external device is connected without impairing the degree of freedom of connection of the external device. Therefore, it is possible to prevent damage or abnormal overheating due to overcurrent or overvoltage.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that the present invention can be understood. The following embodiment is an example embodying the present invention, and does not limit the technical scope of the present invention.
FIG. 1 is a block diagram of an AV system Z including the set top box X1 and the television receiver X2 as an example of the electronic apparatus according to the embodiment of the present invention. FIG. 2 is a block diagram of the set top box X1 and the television. 3 is a block diagram of the main part of the John receiver X2 and the external equipment connected thereto, FIG. 3 is a flowchart showing the procedure of power supply control to the external equipment in the set top box X1 and the television receiver X2, and FIG. 4 is the set top box. It is a figure showing an example of a data structure of the external apparatus candidate information memorize | stored in X1 and the television receiver X2.

First, with reference to the block diagrams shown in FIGS. 1 and 2, a set-top box X1 and a television receiver X2, which are examples of the electronic apparatus according to the embodiment of the present invention, and an AV system including them as components. The configuration of Z will be described.
As shown in FIG. 1, the AV system Z includes a set top box X1, a transmission-side wireless transmission device Y1, a reception-side wireless transmission device Y2, and a television receiver X2.
The set-top box X1 includes a tuner that extracts video signals and audio signals (hereinafter referred to as content signals) of broadcast program content from broadcast signals such as digital terrestrial television broadcasts, sanitary broadcasts, and cable broadcasts. It transmits by wire transmission with respect to the said transmission side wireless transmission apparatus Y1.
The transmission-side wireless transmission device Y1 transmits the content signal obtained from the set top box X1 to the reception-side wireless transmission device Y2 by wireless transmission.
The reception-side wireless transmission device Y2 transmits the content signal obtained from the transmission-side wireless transmission device Y1 to the television receiver X2 by wired transmission.
Thereby, the television receiver X2 performs video display and audio output based on the content signal extracted by the set top box X1. Here, since the content signal is wirelessly transmitted between the transmission-side wireless transmission device Y1 and the reception-side wireless transmission device Y2, the position of the set top box X1 (that is, the broadcast signal capturing position) and the Even if the installation position of the television receiver X2 is distant, there is no need to lay long wires.

The set top box X1 is provided with an HDMI connector 1 to which the HDMI cable c1 is connected and a power supply connector 2 to which the power supply cable c2 is connected. The transmission wireless transmission device Y1 (an example of an external device) is connected to the set top box X1 through the HDMI cable c1 and the power feeding cable c2.
The set-top box X1 has a function of supplying DC power to the transmission-side wireless transmission device Y1 through the power supply terminal included in the power supply connector 2 and the power supply cable c2.
Similarly, the television receiver X2 is also provided with the HDMI connector 1 and the power feeding connector 2. The reception-side wireless transmission device Y2 (an example of an external device) is connected to the television receiver X2 through the HDMI cable c1 and the power feeding cable c2.
The television receiver X2 has a function of supplying DC power to the reception-side wireless transmission device Y2 through the power supply terminal included in the power supply connector 2 and the power supply cable c2.
Further, the transmission of the content signal from the set-top box X1 to the transmission-side wireless power transmission device Y1 and the transmission of the content signal from the reception-side wireless transmission device Y2 to the television receiver X2 are performed using the HDMI cable c1. Done through.

Hereinafter, the set top box X1 and the television receiver X2 are collectively referred to as power supply side electronic devices X1 and X2, and the transmission side wireless transmission device Y1 and the reception side wireless power transmission device Y2 are collectively referred to as a power supply side. It is referred to as electronic devices Y1, Y2 (an example of an external device).
As shown in FIG. 2, in addition to the HDMI connector 1 and the power supply connector 2, the power supply side electronic devices X1 and X2 include a TMDS (Transition Minimized Differential Signaling) transmission circuit 11, a + 5V power supply circuit 12, and a CEC interface. Circuit 13, microcomputer 21 (microcomputer), EEPROM 22, external power supply circuit 31, switch circuit 32, overcurrent protection circuit 33, connection detection circuit 34, temperature sensor 41, fan control circuit 42, ventilation fan 43, alarm buzzer 50, etc. I have.
The HDMI connector 1 is a portion (plug) to which a connector at one end of the HDMI cable c1 is attached. As connection terminals (pins), a TMDS terminal 1a, a CEC terminal 1b, a + 5V power supply terminal 1c, and a DDC terminal. 1d and hot plug detection terminal 1e.
The power supply connector 2 is a portion (plug) to which a connector at one end of the power supply cable c2 is attached, and DC power supplied to the power-supplied side electronic devices Y1 and Y2 is transmitted as a connection terminal. Power supply terminal 2a, hot plug detection terminal 2b, and the like.

The TMDS transmission circuit 11 is a circuit for transmitting or receiving the content signal (content video signal and audio signal) through the TMDS terminal 1a of the HDMI connector 1.
In the set top box X1, the TMDS transmission circuit 11 transmits the content signal extracted by a tuner (not shown) to the transmitting-side wireless transmission device Y1 through the TMDS terminal 1a.
On the other hand, in the television receiver X2, the content signal is received from the reception-side wireless transmission device Y2 through the TMDS terminal 1a, and each of the video signal and the audio signal in the content signal is not shown in FIG. Transmit to each audio processing circuit. The video signal of the content is transmitted to a video display unit (not shown) (liquid crystal panel or the like) through the video processing circuit, and is visualized by the video display unit. The audio signal of the content is transmitted to an audio amplifier and a speaker (not shown) through the audio processing circuit, and is output as audio from the speaker.

The CEC interface circuit 13 transmits control commands and various information exchanged between the microcomputer 21 included in the power supply side electronic devices X1 and X2 and the microcomputer 80 included in the power supply side electronic devices Y1 and Y2. It is a circuit to control.
The + 5V power circuit 1c is a circuit that supplies a DC 5V voltage to the EEPROM 74 included in the power-supplied side electronic devices Y1 and Y2 through the + 5V power terminal 1c. Note that the current flowing by the DC5V voltage supplied through the + 5V power supply terminal 1c is a very low level current necessary and sufficient for data communication, and does not lead to damage (overheating) of components.
The microcomputer 21 in the power supply side electronic devices X1 and X2 receives the power supply side electronic devices Y1 and Y2 from the EEPROM 74 in the power supply side electronic devices Y1 and Y2 supplied with power through the + 5V power supply terminal 1c. EDID (Extended Display Identification Data) including the model information is obtained (read) through the DDC terminal 1d. That is, the microcomputer 21 is an example of model information acquisition means for acquiring model information indicating the type of the device from the power-supplied electronic devices Y1 and Y2 (external devices).
The DDC terminal 1d includes a terminal used for transmission of EDID itself, a terminal used for transmission of a clock signal for synchronizing the data transmission, and the like.

The external power supply circuit 31 supplies DC power to the power-supplied side electronic devices Y1 and Y2 (an example of external devices) connected by the power supply connector 2 and the power supply cable c2 through the power supply terminal 2a. (An example of external power supply means). The external power supply circuit 31 has a function of switching the voltage level of the DC power to be output to any one of predetermined voltage levels in accordance with a control command from the microcomputer 21.
The switch circuit 32 is a circuit for switching whether to output or stop DC power from the external power supply circuit 31 to the power supply terminal 2a in accordance with a control command from the microcomputer 21.
In the overcurrent protection circuit 33, for example, when the power supply terminal 2a is electrically short-circuited, the current flowing from the external power supply circuit 31 to the power supply terminal 2a becomes an excess current. This is a protection circuit that avoids the problem. For example, the overcurrent protection circuit 33 is a circuit that cuts off the DC power supply line or holds the current at the upper limit level when a predetermined upper limit level is reached. This avoids a situation where the external power supply circuit 31 and the power-supplied side electronic devices Y1 and Y2 are damaged by an overcurrent.
Further, the microcomputer 21 sets an upper limit level of the current for which the overcurrent protection circuit 33 performs circuit protection processing, that is, a current limit level.

Further, the connection detection circuit 34 determines whether the HDMI cable c1 is connected to the HDMI connector 71 of the power-supplied electronic devices Y1 and Y2, and the HDMI cable c1 is connected to the HDMI connector 1. Is detected, and the detection result is transmitted to the microcomputer 21.
Further, in the connection detection circuit 34, the power supply cable c2 is connected to the power supply connector 72 of the power supplied side electronic devices Y1 and Y2, and the power supply cable c2 is connected to the power supply connector 2. Is detected, and the detection result is transmitted to the microcomputer 21 (an example of a power supply connection detecting means).
For example, when the power-supplied electronic devices Y1 and Y2 have a circuit for pulling up signal lines connected to the hot plug detection terminals 1e and 2b in the HDMI connector 1 and the power supply connector 72, respectively. The connection detection circuit 34 detects whether the signal level of each of the hot plug detection terminals 1e and 2b is the pull-up level, thereby connecting the HDMI cable c1 to the HDMI connector 1. The status and the connection status of the power supply cable c2 to the power supply connector 2 are detected.
That is, the connection detection circuit 34 has a signal transmission line (the DDC terminal 1d and a signal line connected thereto) for acquiring EDID from the power-supplied side electronic devices Y1 and Y2 connected to the power-supplied side electronic devices Y1 and Y2. It detects whether or not it is connected.
Similarly, the connection detection circuit 34 also detects whether or not the power supply terminal 2a is connected to the power-supplied side electronic devices Y1 and Y2 (an example of a power supply connection detection unit).

The temperature sensor 41 is a sensor that detects the temperature inside the power supply side electronic devices X1 and X2, and is, for example, a thermistor.
Further, the fan control circuit 42 determines whether the power supply side electronic devices X1 and X2 are in-flight according to the comparison result between the temperature detected by the temperature sensor 41 and the management temperature (an example of the set temperature) set by the microcomputer 21. It is a circuit which controls the drive of the said ventilation fan 43 which ventilates.
For example, the fan control circuit 42 rotates the ventilation fan 43 when the temperature detected by the temperature sensor 41 is equal to or higher than the management temperature, and the temperature detected by the temperature sensor 41 falls below the management temperature by a predetermined temperature. In the event of a failure, control is performed to stop the ventilation fan 43.
The alarm buzzer 50 outputs an alarm sound in accordance with an alarm sound output command from the microcomputer 21.

In addition, the EEPROM 22 in the power supply side electronic devices X1 and X2 includes EDID (including model information) candidates for candidates of the power supply side electronic devices Y1 and Y2 that can be connected to the power supply side electronic devices X1 and X2. And external device candidate information D1 including the related information is stored in advance (an example of external device candidate information storage means).
FIG. 4 shows an example of the data configuration of the external device candidate information D1.
As shown in FIG. 4, the external device candidate information D1 is associated with the EDID candidate D11 for the candidates of the power-supplied side electronic devices Y1 and Y2 that can be connected to the power-feed side electronic devices X1 and X2. Information D12, D13 on the power supply conditions and information D14 on the operating conditions of the ventilation fan 43 are included.
More specifically, the information regarding the power supply condition is set in the DC output voltage setting information D12 which is the voltage level of the DC power set in the external power supply circuit 31 and in the overcurrent protection circuit 33. And overcurrent level setting information D13 which is a current limit level (the upper limit level).
Further, the operating condition information D14 of the ventilation fan 43 is, for example, the management temperature for driving control of the ventilation fan 43 set in the fan control circuit 42. Further, it is also conceivable that the information D14 on the operating condition of the ventilation fan 43 is information indicating a condition as to whether or not to drive the ventilation fan 43.

The external device candidate information D1 is normally recorded in the EEPROM 22 when the power supply side electronic devices X1 and X2 are manufactured.
The microcomputer 21 has a function of executing power supply condition information acquisition processing for acquiring information D12 and D13 related to the power supply condition from the microcomputer 80 of the power-supplied side electronic devices Y1 and Y2 through the CEC interface circuit 13. It is provided (an example of power supply condition information acquisition means).
Further, the microcomputer 21 associates the EDID acquired through the DDC terminal 1d with the information D12 and D13 related to the power supply condition acquired through the CEC interface circuit 13 and stores them in the EEPROM 22 as new candidates. A function of executing external device candidate information registration processing is also provided (an example of external device candidate information registration means). With this function, the external device candidate information D1 is additionally registered.
Further, the microcomputer 21 determines the operating condition information D14 of the ventilation fan 43 in the external device candidate information D1 to be added based on the contents of the information D12 or D13 related to the power supply condition in the external device candidate information registration process. Also set. For example, the microcomputer 21 sets the operation condition information D14 of the ventilation fan 43 so that the drive condition of the ventilation fan 43 is relaxed (the drive becomes easier) as the current level represented by the overcurrent level setting information D13 is higher. Set. More specifically, the microcomputer 21 sets the operating condition information D14 of the ventilation fan 43 so that the management temperature becomes lower as the current level represented by the overcurrent level setting information D13 is higher. Alternatively, the microcomputer 21 may operate the ventilation fan 43 so that the ventilation fan 43 is driven when the current level represented by the overcurrent level setting information D13 is equal to or higher than a preset level. Set.
The power supply condition information acquisition processing and external device candidate information registration processing by the microcomputer 21 are performed when, for example, it is detected that a predetermined connected device registration operation is performed through an operation unit (operation key or the like) not shown. Executed.

On the other hand, the power-supplied side electronic devices Y1 and Y2 include an HDMI connector 71, a power supply connector 72, a power supply circuit 73, an EEPROM 74, a TMDS transmission circuit 75, a microcomputer 80, a CEC interface circuit 81, a ROM 82, and the like.
In the EEPROM 74 in the power-supplied side electronic devices Y1 and Y2, EDID including model information of the power-supplied side electronic devices Y1 and Y2 is stored in advance.
The HDMI connector 71 is connected to a connector provided at one end of the HDMI cable c1 (the end opposite to the side connected to the power feeding side electronic devices X1 and X2).
The TMDS transmission circuit 75 in the power-supplied electronic devices Y1 and Y2 is also a circuit that performs transmission control of the content signal, similarly to the TMDS transmission circuit 11 in the power-feeding electronic devices X1 and X2.
That is, in the transmission side wireless transmission apparatus Y1, the TMDS transmission circuit 75 receives the content signal from the set top box X1, and transmits the content signal to a wireless transmission circuit (not shown). Accordingly, the content signal is wirelessly transmitted to the reception-side wireless transmission device Y2 by the wireless transmission circuit.
In the reception-side wireless transmission device Y2, the TMDS transmission circuit 75 inputs the content signal received from the transmission-side wireless transmission device Y1 by a wireless reception circuit (not shown), and the content signal is input to the television. Transmit to the receiver X2. As a result, video and audio based on the content signal are output by the television receiver X2.

The CEC interface circuit 81 is a circuit having the same function as the CEC interface circuit 13 in the power supply side electronic devices X1 and X2.
Further, the power supply circuit 73 in the power-supplied side electronic devices Y1 and Y2 inputs DC power supplied from the external power supply circuit 31 through the power supply cable c2 and the power supply connector 72 as primary power. Is transformed to a predetermined voltage and output as secondary side DC power. The secondary side DC power is supplied to the wireless transmission circuit, the wireless reception circuit, the TMDS transmission circuit 75, the microcomputer 80, the CEC interface circuit 81 and other circuits in the power-supplied electronic devices Y1 and Y2. Supplied.
In this way, the power-supplied side electronic devices Y1 and Y2 do not need to be connected to a commercial power source because necessary power is supplied from the power supply side electronic devices X1 and X2.
The ROM 82 accessed by the microcomputer 80 stores in advance information relating to power supply conditions for the power supply circuit 73 in the power-supplied electronic devices Y1 and Y2. The information is information corresponding to information D12 and D13 related to the power supply condition stored in the EEPROM 22 in the power supply side electronic devices X1 and X2.
The microcomputer 80 sends information on the power supply condition stored in the ROM 82 to the microcomputer 21 through the CEC interface circuit 81 in response to a request from the microcomputer 21 in the power supply side electronic devices X1 and X2. Send.

  Next, referring to the flowchart shown in FIG. 3, a procedure for power supply control to external devices (the power-supplied side electronic devices Y1 and Y2) executed by the microcomputer 21 in the power supply side electronic devices X1 and X2 is described. explain. The process shown in FIG. 3 is executed immediately after the start-up of the power supply side electronic devices X1 and X2. S1, S2,... Described below represent processing procedure identification codes. In the following description, the power-supplied side electronic devices Y1 and Y2 connected to the power supply side electronic devices X1 and X2 are referred to as external devices Y. Further, in the initial state before the processing shown in FIG. 3 is started, the switch circuit 32 is in a state in which output of DC power from the external power supply circuit 31 to the power supply terminal 2a is stopped.

First, the microcomputer 21 monitors whether or not the power supply side electronic devices X1 and X2 are connected to the external device Y through the HDMI cable c1 (S1). The monitoring is performed by monitoring the detection result of the connection detection circuit 34.
When the connection to the external device Y through the HDMI cable c1 is detected, the microcomputer 21 acquires EDID from the external device Y through the DDC terminal 1d (S2).
Next, the microcomputer 21 determines whether or not the EDID acquired in step S2 is already stored in the EEPROM 22 as the EDID candidate D11 in the external device candidate information D1, that is, the EDID acquisition destination. It is determined whether or not the external device Y is a registered device (S3).

When the external device Y from which the EDID is acquired is a registered device, the microcomputer 21 sets a predetermined power supply prohibition flag to OFF (S4). Further, the microcomputer 21 satisfies the power supply enabling condition described later in accordance with the information D12 and D13 related to the power supply condition corresponding to the EDID acquired in step S2 in the external device candidate information D1 stored in the EEPROM 22. An operating condition when DC power is output to the power supply terminal 2a is set (S5, an example of an operating condition setting means at the time of power output).
That is, the microcomputer 21 sets an output voltage of DC power to the external power supply circuit 31 in accordance with the DC output voltage setting information D12.
The microcomputer 21 sets a current limit level (upper limit level) for the overcurrent protection circuit 33 in accordance with the overcurrent level setting information D13.
Further, the microcomputer 21 sets the management temperature or whether or not to drive the ventilation fan 43 during power supply to the fan control circuit 42 in accordance with the operating condition information D14 of the ventilation fan 43. .
On the other hand, when the external device Y from which the EDID is acquired is not a registered device, that is, not stored in the EEPROM 22, the microcomputer 21 sets a predetermined power supply prohibition flag to ON (S6). .

After the processing of steps S3 to S6, the microcomputer 21 monitors whether or not the power supply side electronic devices X1 and X2 are connected to the external device Y through the HDMI cable c1 as in step S1. At the same time (S7), it is monitored whether or not the power supply side electronic devices X1 and X2 are connected to the external device Y through the power supply cable c2 (S8).
Here, when the power supply side electronic devices X1 and X2 change to a state where they are not connected to the external device Y through the HDMI cable c1, the microcomputer 21 shifts the processing to the above-described step S1. Thereby, the process from step S1 is restarted.
If the HDMI cable c1 is connected to the external device Y but is not connected to the external device Y through the power feeding cable c2, the microcomputer 21 performs steps S7 and S8. Repeat the process.

When the power supply side electronic devices X1 and X2 are connected to the external device Y through the HDMI cable c1 and are connected to the external device Y through the power supply cable c2, the microcomputer 21 It is determined whether the power supply prohibition flag is ON or OFF (S9).
By the way, the situation in which the power supply prohibition flag is OFF in step S9 indicates that the connection detection circuit 34 has detected that the power supply terminal 2a is connected to the external device Y, and the EEPROM 22 This is a situation where there is a candidate for the external device Y corresponding to the EDID acquired by the process of step S2 in the stored information. This situation is hereinafter referred to as a situation where the power supply permission condition is satisfied.

When the microcomputer 21 determines that the power supply permission condition is satisfied (Y side in step S9), the DC power is output from the external power supply circuit 31 to the power supply terminal 2a. Thus, the switch circuit 32 is switched (S10). Thus, DC power is output from the external power feeding circuit 31 to the power supply terminal 2a in accordance with the operating conditions set in step S5.
On the other hand, the microcomputer 21 is in a state where the power supply permission condition is not satisfied even though the power supply side electronic devices X1 and X2 are connected to the external device Y through the power supply cable c2. If it is determined (N side in step S9), an error notification is issued by causing the alarm buzzer 50 to output an alarm sound while maintaining the DC power output stop state from the external power supply circuit 31 to the power supply terminal 2a. Perform (S11). This error notification does not supply DC power to the external device Y because the connected external device Y does not correspond to any of the candidates for the external device Y that can be connected in the external device candidate information D1. This is a notification. As a result, it is possible to prevent a user who has connected the external device Y to the power supply side electronic devices X1 and X2 from misidentifying that the power is not supplied to the external device Y as an abnormal state.

In addition, after the processing of steps S9 to S11, the microcomputer 21 connects the power supply side electronic devices X1 and X2 to the external device Y through the HDMI cable c1 and connects to the external device Y through the power supply cable c2. It is monitored whether or not the set status is maintained (S12).
As a result, while the situation where the power supply side electronic devices X1 and X2 are connected to the external device Y by both the HDMI cable c1 and the power supply cable c2 continues, the external device is satisfied by the establishment of the power supply permission condition. A state in which DC power is supplied to Y or a state in which DC power supply to the external device Y is stopped due to the failure of the power supply permission condition is maintained.
When either the connection to the external device Y through the HDMI cable c1 or the connection to the external device Y through the power supply cable c2 is detected, the microcomputer 21 detects the external power supply. The switch circuit 32 is switched so that the output of DC power from the circuit 31 to the power supply terminal 2a is stopped (S13). Thereafter, the microcomputer 21 returns the process to step S1 described above.

As described above, the microcomputer 21 outputs DC power from the external power supply circuit 31 to the power supply terminal 2a in a situation where the power supply permission condition is satisfied (S4, S9, S10). In a situation where the power supply permission condition is not satisfied, power supply control is performed to stop the output of DC power from the external power supply circuit 31 to the power supply terminal 2a (S6, S9, S11, S13).
Therefore, according to the power supply side electronic devices X1 and X2, it is possible to prevent the unexpected external device Y from being connected to cause damage or abnormal overheating due to overcurrent or overvoltage.
Further, the microcomputer 21 determines the power supply condition according to the information D12 and D13 related to the power supply condition corresponding to the EDID acquired by the process of step S2 in the external device candidate information D1 stored in the EEPROM 22. Is established and operating conditions are set when DC power is output to the power supply terminal 2a (S5). Thus, according to the power supply side electronic devices X1 and X2, even when the specifications of the external device Y that can be connected are different, it is possible to set operating conditions according to the specifications of the external device Y. The degree of freedom of Y connection is not impaired.
The embodiment described above is an example in which the power supply side electronic devices X1 and X2 acquire EDID from the power supply side electronic devices Y1 and Y2 through the DDC terminal 1d in HDMI. An embodiment in which model information of EDID or similar external devices is acquired through an interface is also conceivable.

  The present invention can be used for electronic devices.

1 is a block diagram of an AV system Z that includes a set-top box X1 and a television receiver X2 as examples of an electronic apparatus according to an embodiment of the invention. The block diagram of the principal part of the set top box X1, the television receiver X2, and the external apparatus connected to it. The flowchart showing the procedure of the electric power feeding control to the external apparatus in the set top box X1 and the television receiver X2. The figure showing an example of the data structure of the external apparatus candidate information memorize | stored in the set top box X1 and the television receiver X2.

Explanation of symbols

X1: Set-top box (electronic device on the power supply side)
X2: Television receiver (electronic device on the power supply side)
Y1: Transmission side wireless transmission device (powered side electronic device)
Y2: Reception side wireless transmission device (powered side electronic device)
Z: AV system c1: HDMI cable c2: power supply cable 1: HDMI connector 2: power supply connector 11, 75: TMDS transmission circuit 12: + 5V power supply circuit 13, 81: CEC interface circuit 21, 80: microcomputers 22, 74 : EEPROM
31: External power supply circuit 32: Switch circuit 33: Overcurrent protection circuit 34: Connection detection circuit 41: Temperature sensor 42: Fan control circuit 43: Ventilation fan 50: Alarm buzzer S1, S2, ...: Processing procedure (step)
D1: External device candidate information

Claims (6)

  1. External power supply means for supplying power to the external device through a power supply terminal, power supply connection detection means for detecting whether the power supply terminal is connected to the external device, and the type of the external device from the external device An electronic device comprising model information acquisition means for acquiring model information representing
    External device candidate information storage means for storing the model information candidates for the external device candidates;
    The power supply connection detection means detects that the power supply terminal is connected to the external device, and the model information acquired by the model information acquisition means is stored in the external device candidate information storage means. When the power supply permission condition that the corresponding candidate for the external device exists is satisfied, power is output from the external power supply means to the power supply terminal, and when the power supply permission condition is not satisfied, the external power supply is performed. Power supply control means for stopping output of power from the means to the power supply terminal;
    An electronic apparatus comprising:
  2. The external device candidate information storage unit stores the model information candidates and information relating to the power supply conditions associated therewith,
    According to the information on the power supply condition corresponding to the model information acquired by the model information acquisition unit in the storage information of the external device candidate information storage unit, the power supply condition is satisfied and the power supply terminal is connected to the power supply terminal. The electronic device according to claim 1, further comprising power output operation condition setting means for setting an operation condition when power is output.
  3.   The operating condition includes a power output condition that is one or both of an output voltage of the external power supply means and a current limit level in an overcurrent protection means for limiting a current output through the power supply terminal. The electronic device according to claim 2.
  4. Power supply condition information acquisition means for acquiring information on the power supply condition for the external device from the external device;
    An external device that associates the model information acquired by the model information acquisition unit with the information on the power supply condition acquired by the power supply condition information acquisition unit and stores them in the external device candidate information storage unit as new candidates. Device candidate information registration means;
    The electronic device according to claim 2, further comprising:
  5.   The operating condition is either a condition for determining whether or not to drive the ventilation fan, or a condition for the set temperature in the control means for controlling the drive of the ventilation fan according to a comparison result between the temperature detected by the temperature detection means and the set temperature The electronic device according to claim 2, comprising:
  6.   2. A notification unit configured to perform predetermined notification when the power supply connection detection unit detects that the power supply terminal is connected to the external device and the power supply permission condition is not satisfied. Electronic device in any one of -5.
JP2008289103A 2008-11-11 2008-11-11 Electronic apparatus Withdrawn JP2010117789A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012003523A (en) * 2010-06-17 2012-01-05 Panasonic Corp Communication device and its power feeding method and power feeding system
WO2013088480A1 (en) * 2011-12-16 2013-06-20 日立コンシューマエレクトロニクス株式会社 Sink device and power supply method
US8836867B2 (en) 2012-10-30 2014-09-16 Funai Electric Co., Ltd. Video/audio signal processing apparatus
JP2015167396A (en) * 2015-05-18 2015-09-24 日立マクセル株式会社 Sink apparatus and power supply method

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012003523A (en) * 2010-06-17 2012-01-05 Panasonic Corp Communication device and its power feeding method and power feeding system
US8724277B2 (en) 2010-06-17 2014-05-13 Panasonic Corporation Communication device, power supplying method therefor, and power supply system
WO2013088480A1 (en) * 2011-12-16 2013-06-20 日立コンシューマエレクトロニクス株式会社 Sink device and power supply method
CN106354245A (en) * 2011-12-16 2017-01-25 日立麦克赛尔株式会社 Receiving device and power supply method
CN104054037A (en) * 2011-12-16 2014-09-17 日立麦克赛尔株式会社 Sink Device And Power Supply Method
JPWO2013088480A1 (en) * 2011-12-16 2015-04-27 日立マクセル株式会社 Sink device and power supply method
US9253535B2 (en) 2011-12-16 2016-02-02 Hitachi Maxell, Ltd. Sink device receiving an image signal from a source device and power supply method for same
CN104054037B (en) * 2011-12-16 2016-10-12 日立麦克赛尔株式会社 Reception equipment and power supply method
CN106354245B (en) * 2011-12-16 2019-01-29 麦克赛尔株式会社 Receiving device and power supply method
US8836867B2 (en) 2012-10-30 2014-09-16 Funai Electric Co., Ltd. Video/audio signal processing apparatus
JP2015167396A (en) * 2015-05-18 2015-09-24 日立マクセル株式会社 Sink apparatus and power supply method

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