JP7459559B2 - Projection device, power supply device, abnormality detection method, and abnormality detection program - Google Patents

Description

The present invention relates to a projection device, a power supply device, a power supply control method, and a power supply control program, and, for example, to a small and lightweight projection device that can be powered by a battery power source.

Projection devices have been developed for some time now (see, for example, Patent Document 1). In recent years, portable projection devices that can be carried around have also been considered.

JP 2012-198439 A

However, when carrying a portable projection device in a bag, there is a possibility that something may push the power button by mistake. If projection starts inside the bag, power will be consumed unnecessarily. Also, problems may occur due to heat accumulation from the light source and projection light.

The object of the present invention is to prevent the projection device from turning on due to an accidental operation when the power button is pressed when the projection device is carried.

The present invention has been made in view of this background, and provides a projection device, a control method for a power supply device, and a method for controlling a power supply device, which can prevent lighting due to erroneous operation even if the power button is pressed when carrying the projection device. The task is to provide a program.

In order to solve the above problems, the projection device or power supply device of the present invention is a projection device configured to be able to connect a commercial power source as an AC power source and a battery power source as a DC power source as a power source for lighting a projection light source. The apparatus includes: a connector for connecting an external device (for example, a video output device); a control means for determining whether or not a battery power source is connected; and when a user operation on the operation button for lighting the projection light source is received, it is determined whether the voltage of the power pin of the connector is equal to or higher than a predetermined threshold, or whether a video signal is input from the connector. determination means for determining whether or not the projection signal is present, and the control means is configured to control the projection voltage when the voltage determined by the determination means is greater than or equal to the predetermined threshold, or when the video signal is input. It is characterized in that lighting of the light source is started and lighting of the projection light source is prohibited when the voltage determined by the determining means is less than the predetermined threshold value or when the video signal is not input. shall be. Note that the symbols and characters in parentheses are examples.

According to the present invention, when carrying the projection device, even if the power button is pressed, the projection device will not turn on due to an erroneous operation.

1 is a configuration diagram of a projection device according to a first embodiment of the present invention. FIG. 3 is a diagram showing pin assignments of an HDMI connector. It is a flow chart for explaining operation at the time of starting up of the projection device of the present invention. FIG. 2 is an explanatory diagram for explaining an HDMI negotiation flow. It is a block diagram of the projection device of 2nd Embodiment of this invention. It is a figure showing the pin assignment of DP connector. FIG. 2 is a diagram showing a pin assignment of a VGA connector.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention (hereinafter referred to as "this embodiment") will be described in detail below with reference to the drawings. Note that each figure is merely shown schematically to the extent that this embodiment can be fully understood. Further, in each figure, common or similar components are denoted by the same reference numerals, and redundant explanation thereof will be omitted.

(First embodiment)
FIG. 1 is a configuration diagram of a projection apparatus according to a first embodiment of the present invention.
The projection system S includes a projection device 100, a video output device 200 (external device), an HDMI (registered trademark) cable 150 that connects these, and a battery power source E that supplies DC power to the projection device 100.

The projection device 100 includes a standby power supply control unit 11, a main CPU 20, a projection unit 30, an HDMI receiver 40, a semiconductor switch 12, a mechanical switch 13, and a FAN 60. The semiconductor switch 12 is a high-performance semiconductor power switch that has built-in protection circuits against overcurrent and overheating, and a circuit that absorbs the energy of an inductive load, etc., and is not destroyed even in abnormal conditions such as a short circuit and can maintain its function as a switch. An IPD (Intelligent Power Device), IPS (Intelligent Power switch), Smart Switch, or Hi-side/Lo-side switch can be used as the semiconductor switch 12.

The battery power source E is a secondary battery, but it may also be a primary battery. The negative terminal of the battery power source E is connected to the standby power source control unit 11, the main CPU 20, the projection unit 30, and the FAN 60. The positive terminal of the battery power source E is connected to the standby power source control unit 11 and one end of the semiconductor switch 12. The other end of the semiconductor switch 12 is connected to the main CPU 20, the projection unit 30, and the FAN 60. Both ends of the mechanical switch 13 are connected to the standby power source control unit 11.

The projection device 100 is configured to be able to connect a commercial power source as an AC power source and a battery power source as a DC power source as a power source for lighting the projection light source. When a user operation on an operation button for lighting the projection light source is received, the standby power supply control unit 11 (control means, determination means) determines whether the voltage of the power supply pin of the connector is equal to or higher than a predetermined threshold value.

However, the main CPU 20 (control means) can determine in advance whether or not the device is battery-powered. The main CPU 20 (control means) can determine whether or not the device is battery-powered, for example, based on the voltage value input from the power source. Alternatively, when the device is battery-powered, a pulse signal is output from the battery, which is different from when the device is powered by an AC power source, so that it can determine whether or not the device is battery-powered.

In this way, by determining whether the device is battery-powered before determining whether the voltage of the power pin of the connector is equal to or higher than a predetermined threshold, if it is determined that the projection device 100 is connected to a commercial power source as an AC power source as the power source for lighting the projection light source, there is no need to determine whether the voltage of the power pin of the connector is equal to or higher than a predetermined threshold when a user operation is received on the operation button (power button) for turning on the projection light source. If a commercial power source as an AC power source is connected as the power source for lighting the projection light source, there is no need to prohibit the projection light source from being turned on, so when the power button is pressed by the user, the light source turns on immediately. Therefore, the user can use the projection device 100 without any discomfort.

The standby power supply control unit 11 receives a power supply voltage of +5V (5V Power) from the video output device 200 via the HDMI cable 150 and the HDMI receiver 40. In addition, both ends of the mechanical switch 13 are connected to the standby power supply control unit 11. In this state, when the mechanical switch 13 transitions from the OFF state to the ON state, the standby power supply control unit 11 sets the semiconductor switch 12 to the ON state when it detects a power supply voltage of +5V from the video output device 200.

On the other hand, when the standby power supply control unit 11 cannot detect a power supply voltage of +5V from the video output device 200, it keeps the semiconductor switch 12 in the OFF state. In other words, when the standby power supply control unit 11 cannot detect a power supply voltage of +5V from the video output device 200, it prohibits the main CPU 20, the projection unit 30, and the FAN 60 from being driven.

After starting up, the main CPU 20 transmits an HPD (Hot Plug Detect) signal to the video output device 200 via the HDMI receiver 40 and HDMI cable 150. This establishes a connection between the projection device 100 and the video output device 200. The main CPU 20 processes the video signal output from the HDMI receiver 40 and outputs the processed image to the projection unit 30. Note that the main CPU 20 exchanges various information with the video output device 200 using a CEC (Consumer Electronics Control) signal.

The projection unit 30 projects the processed image processed by the main CPU 20 onto an external projection object (screen, etc.). Note that the projection unit 30 includes a light source (not shown) and easily generates heat. The FAN 60 cools the projection section 30 with air.

The HDMI receiver 40 receives a video signal from the video output device 200 and outputs the received video signal to the main CPU 20. The HDMI receiver 40 also transmits device information of the projection device 100 to the video output device 200 using a DDC (Display Data Channel) signal.

The video output device 200 is, for example, a PC (Personal Computer) or a BD (Blu-ray Disc) player, and includes a CPU 220, an image processing unit 230, an HDMI transmitter 240, and a connector 250. The CPU 220 controls the entire video output device 200. The image processing unit 230 includes a VRAM (not shown), and processes images stored in the VRAM under the control of the CPU 220. The HDMI transmitter 240 transmits a video signal to the HDMI receiver 40 of the projection device 100.

The HDMI cable 150 transmits video signals from the video output device 200 to the projection device 100. The HDMI cable 150 also transmits device information and authentication information between the video output device 200 and the projection device 100. The connectors 50 and 250 are 19-pin connectors, and the pin assignment is shown in FIG. 2. For example, pins 1 to 9 are TMDS_DATA, and pins 10 to 12 are TMDS_CLOCK. Also, pin 17 is ground, pin 18 is "5V" Power, and pin 19 is "HPD". In TMDS (Transition Minimized Differential Signaling), four channels are grouped together and used in a unit called a "link". Of the four channels, one channel each is assigned to RGB video signals, and one channel is assigned to a signal for synchronizing the clock frequency.

FIG. 3 is a flow chart for explaining the operation of the projection device of the present invention.
This flow starts when the battery power source E is attached, and is repeated until the battery power source E is depleted or removed.
The standby power supply control unit 11 (determination means) first performs a general initialization process (S1), and then determines whether the mechanical switch 13 is turned on (Power key IN) (S2). That is, the standby power supply control unit 11 determines whether the mechanical switch 13 transitions from an OFF state to an ON state. If the mechanical switch 13 does not transition from an OFF state to an ON state (No in S2), the standby power supply control unit 11 executes another polling process that periodically makes an inquiry (S3), and repeats the determination of whether the mechanical switch 13 is turned on (S2).

On the other hand, if the mechanical switch 13 transitions from the OFF state to the ON state (Yes in S2), the standby power supply control unit 11 (determination means) determines whether or not a 5V power supply voltage (5V Power) from the video output device 200 has been detected (S4). If the 5V power supply voltage is not detected (No in S4), the standby power supply control unit 11 executes another polling process (S3) and repeats the determination of whether the mechanical switch 13 is turned on (S2). On the other hand, if the 5V power supply voltage is detected (Yes in S4), the standby power supply control unit 11 sets the semiconductor switch 12 to the ON state (S5).

In S4, the standby power supply control unit 11 (determination means) determines whether or not the 5V power supply voltage (5V Power) from the video output device 200 is detected. 150, the power supply voltage is not completely 0V even when the video source is not output from the video output device 200. Therefore, for example, the determination can be made based on whether the voltage of the power pin of the connector 50 of the projection apparatus 100 is equal to or higher than a predetermined threshold.

As a result, the main CPU 20, the projection section 30, and the FAN 60 are activated, and the light source of the projection section 30 is turned on. That is, the standby power supply control section 11 starts up the main CPU 20, the projection section 30, and the FAN 60 when the mechanical switch 13 changes and the 5V power supply voltage is detected. After the processing in S5, the standby power supply control unit 11 (determination means) executes another polling process (S3), and repeats the determination of whether the mechanical switch 13 is turned on (S2).

FIG. 4 is an explanatory diagram for explaining the HDMI negotiation flow.
Here, the description will be made assuming that an HDMI cable 150 is connected between the projection device 100 and the video output device 200.
When the video output device 200 is powered on, the 5V power pin of the connector 250 becomes HIGH level. As a result, the 5V power pin of the connector 50 of the projection device 100 also goes to the HIGH level. In the projection apparatus 100, the standby power supply control unit 11 detects the HIGH level state of the 5V power supply pin (S4), and the main CPU 20 transmits the HPD signal to the video output device 200 (S10).

The video output device 200 detects the HPD signal (S11) and instructs the projection device 100 to transmit EDID (Extended Display Identification Data) (S12). The projection device 100 returns the EDID to the video output device 200 (S13). The video output device 200 reads the EDID (S14), where the EDID is data stored in a sink device such as the projection device 100. This data includes "resolution", "refresh rate", "color depth", and corresponding "audio format" that the projection device 100 can display.

After processing in S14, the video output device 200 determines the capability of the sink device (S15) and determines the capability of the AV format (S16). Further, the video output device 200 and the projection device 100 perform HDCP (High-bandwidth Digital Content Protection) authentication (S17, S18). HDCP authentication is an encryption technology that prevents copyright-protected video content from being illegally copied while being transmitted to a display device. In HDCP authentication, the video sending side (HDCP transmitter) such as a computer and the receiving side (HDCP receiver) such as a display each have their own unique encryption key, and this is used to authenticate that the device is a genuine HDCP compatible device. , exchange encryption keys, and encrypt and decrypt video data.

After completing the HDCP authentication in S17 and S18, the video output device 200 performs TMDS transmission to the projection device 100 (S19). Thereby, the projection device 100 receives the TMDS (S20).

As described above, according to the projection apparatus 100 of this embodiment, when the video output device 200 is connected to the HDMI cable 150 and the video output device 200 is being driven, the standby power control section 11 controls the mechanical switch 13. When the transition and the detection of the 5V power supply voltage from the video output device 200 are performed, the semiconductor switch 12 is turned on. As a result, the main CPU 20, the projection section 30, and the FAN 60 are activated, and the light source of the projection section 30 is turned on.

(Second embodiment)
Although the standby power supply control unit 11 of the first embodiment detects the 5V power supply voltage from the video output device 200, it may also detect a video signal.

FIG. 5 is a diagram showing the configuration of a projection device according to a second embodiment of the present invention.
In the projection device 101 of this embodiment, compared to the projection device 100 of the first embodiment, a signal line of a +5V power supply is not connected between the HDMI receiver 40 and the standby power supply control unit 11. In other words, the +5V power supply connects between the HDMI receiver 40 and the HDMI transmitter 240. In addition, various signal lines are connected between the HDMI receiver 40 and the standby power supply control unit 11. When the video output device 200 transmits TMDS to the projection device 101, the projection device 101 receives the TMDS and detects the video signal. In this way, the detection of the video signal from the video output device 200 is performed by the TMDS channel between the HDMI transmitter 240 of the video output device 200 and the HDMI receiver 40 of the projection device 101.

Further, the standby power supply control section 11 has functional sections of an EDID response section 11a and an HDCP authentication section 11b. As a result, the standby power supply control unit 11 of the projection device 101 not only performs 5V HIGH detection (S4) in the HDMI negotiation flow (FIG. 4), but also performs HPD transmission (S10), EDID response (S13), and HDCP authentication (S18). Also execute.

When the HDCP authentication (S18) is completed, the standby power supply control unit 11 sets the semiconductor switch 12 to the ON state. As a result, the main CPU 20, the projection section 30, and the FAN 60 are activated, and the light source of the projection section 30 is turned on. Then, the main CPU 20 receives the video signal via the HDMI receiver 40. The main CPU 20 sends the received video signal to the projection unit 30 to project it onto a projection object such as a screen.

As described above, according to the projection device 101, the standby power supply control unit 11 performs HDMI negotiation, and sets the semiconductor switch 12 to the ON state after the negotiation is completed. In other words, when a video signal cannot be input, the semiconductor switch 12 is in the OFF state, and when a video signal can be input, the semiconductor switch 12 is in the ON state. Therefore, when the portable projection device 101 is carried in a bag, even if the power button is pressed by mistake due to being pressed by something, DC power is not output unless the connected video output device 200 is driven, so that lighting due to erroneous operation can be prevented.
The control means prohibits the projection light source from being turned on when a battery power source is connected as the power source for turning on the projection light source. Therefore, when the projection device 101 is connected to a commercial power source as an AC power source as the power source for turning on the projection light source, the light source is turned on immediately when the power button is pressed by the user. Therefore, the user can use the projection device 101 without feeling uncomfortable.

(Modification)
The present invention is not limited to the above-described embodiment, and various modifications are possible, for example, as follows.
(1) The projection device 100 of the above embodiment uses HDMI, but it is also possible to use DP (Display Port (trademark) ) or VGA (Video Graphics Array). FIG. 6 shows the pin assignment of a DP connector, and FIG. 7 shows the pin assignment of a VGA connector. However, VGA is compliant with the VESA (Video Electronics Standards Association) standard, and pin 9 is set to "DDC +5 volt load."

[Additional Notes]
<Claim 1>
A projection device configured to be connectable to a commercial power source as an AC power source and a battery power source as a DC power source as a power source for lighting a projection light source,
A connector for connecting an external device;
a determination means for determining whether or not a voltage of a power pin of the connector is equal to or higher than a predetermined threshold value, or whether or not a video signal is being input from the connector, when the battery power source is connected and a user operation on an operation button for turning on the projection light source is received;
a control means for starting lighting of the projection light source when the voltage determined by the determination means is equal to or greater than the predetermined threshold value or when the video signal is being input, and forbidding lighting of the projection light source when the voltage determined by the determination means is less than the predetermined threshold value or when the video signal is not being input;
A projection device comprising:
<Claim 2>
the external device is a video output device,
a first switch (semiconductor switch) that supplies DC power from the battery power source to a projection unit;
Equipped with
The projection device according to claim 1, characterized in that the control means is connected to the battery power source, shorts the first switch at a timing indicating a change in state of the second switch (mechanical switch), prohibits shorting of the first switch when no voltage is detected at the power pin of the connector, and allows shorting of the first switch when voltage is detected at the power pin of the connector.
<Claim 3>
The connector is an HDMI (registered trademark) connector or a DP connector,
A second control unit is further provided on the output side of the first switch,
3. The projection device according to claim 2, wherein the determining unit determines the connection with the video output device via the connector.
<Claim 4>
4. The projection device according to claim 1, wherein the control unit controls the projection light source after the determination unit determines that the connection with the external device has been completed.
<Claim 5>
the external device is a video output device,
a first switch that supplies DC power from the battery power source to a projection unit;
Equipped with
The projection device according to claim 2, characterized in that the control means is connected to the battery power source, shorts the first switch when the second switch is shorted, prohibits the shorting of the first switch when a video signal cannot be input from the connector, and allows the shorting of the first switch when a video signal is input from the connector.
<Claim 6>
A connector for connecting an external control device;
a first switch for supplying DC power from a battery power source to a drive circuit;
a control means connected to the battery power source and inhibiting the supply of DC power when a voltage at a power pin of the connector cannot be detected.
<Claim 7>
A power supply control method executed by a control unit connected to a battery power supply of a power supply device including a connector for connecting an external control device and a power supply circuit for supplying DC power to a drive circuit, the method comprising:
A power supply control method comprising the steps of: prohibiting the supply of DC power when a voltage at a power supply pin of the connector cannot be detected.
<Claim 8>
A power supply control program to be executed by a control unit connected to a battery power supply of a power supply device including a connector for connecting an external control device and a power supply circuit for supplying DC power to a drive circuit,
A power supply control program, comprising: a power supply control program for inhibiting the supply of DC power when a voltage of the power supply of the connector cannot be detected.

10 Power supply device 11 Standby power supply control unit (control means, determination means)
12 Semiconductor switch (first switch)
13 Mechanical switch (mechanical switch)
20 Main CPU (control means)
30 Projection unit 40 HDMI receiver 50 Connector 100, 101 Projection device 150 HDMI cable 200 Video output device (external device)

Claims (9)

A projection device configured to be connectable to a commercial power source as an AC power source and a battery power source as a DC power source as a power source for lighting a projection light source,
A connector for connecting an external device;
A control means for determining whether a battery power source is connected;
a determination means for determining whether a voltage of a power pin of the connector is equal to or higher than a predetermined threshold value or whether a video signal is being input from the connector when it is determined that the battery power source is connected and when a user operation is received on an operation button for turning on the projection light source;
Equipped with
The control means starts turning on the projection light source when the voltage determined by the determination means is equal to or greater than the predetermined threshold value or when the video signal is input, and prohibits turning on the projection light source when the voltage determined by the determination means is less than the predetermined threshold value or when the video signal is not input.
13. A projection device comprising: When the control means determines that the commercial power source is connected and receives a user operation on the operation button for lighting the projection light source, the control means controls the voltage of the power pin of the connector. The projection apparatus according to claim 1, wherein the projection light source is turned on without determining whether or not is equal to or greater than a predetermined threshold. the external device is a video output device,
a first switch that supplies DC power from the battery power source to a projection unit;
Equipped with
The projection device according to claim 1, characterized in that the control means is connected to the battery power source, shorts the first switch at a timing indicating a change in state of the second switch, prohibits shorting of the first switch when no voltage is detected at the power pin of the connector, and allows shorting of the first switch when voltage is detected at the power pin of the connector. the connector is an HDMI connector or a DP connector;
A second control unit is further provided on the output side of the first switch,
4. The projection device according to claim 3 , wherein the determining unit determines the connection with the video output device via the connector. 2. The projection apparatus according to claim 1 , wherein the control means controls the projection light source after the determination means determines whether the connection with the external device is complete. The external device is a video output device,
a first switch that supplies DC power from the battery power source to the projection unit;
Equipped with
The control means is connected to the battery power source, short-circuits the first switch at a timing when the second switch is short-circuited, and prohibits short-circuiting of the first switch when a video signal cannot be input from the connector. 4. The projection apparatus according to claim 3 , wherein short-circuiting of the first switch is permitted when a video signal is input from the connector. A connector for connecting external control equipment,
a first switch that supplies DC power from the battery power source to the drive circuit;
Determining whether or not the battery power source is connected, and when it is determined that the battery power source is connected and the voltage of the power pin of the connector cannot be detected, the supply of the DC power is stopped. A power supply device characterized by comprising: a control means for prohibiting. A power supply control method executed by a control unit connected to a battery power source of a power supply device including a connector for connecting an external control device and a power supply circuit for supplying DC power to a drive circuit, the method comprising:
Determining whether or not the battery power source is connected, and when it is determined that the battery power source is connected and the voltage of the power pin of the connector cannot be detected, the supply of the DC power is stopped. A power supply control method characterized by prohibiting. A power supply control program to be executed by a control unit connected to a battery power supply of a power supply device including a connector for connecting an external control device and a power supply circuit for supplying DC power to a drive circuit,
A power supply control program characterized by determining whether or not the battery power supply is connected, and when it is determined that the battery power supply is connected and the voltage of the power supply of the connector cannot be detected, prohibiting the supply of DC power.

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