Power supply control apparatus having a function supplying power supply voltage
a technology of power supply voltage and power supply control, which is applied in the direction of two-way working systems, instruments, television systems, etc., and can solve problems such as devices failing
Inactive Publication Date: 2009-06-04
FUNAI ELECTRIC CO LTD
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Benefits of technology
The present invention is a power supply control apparatus that prevents external equipment from receiving overcurrent. It includes a port that receives potentials of power supplies from multiple types of power supplies, a voltage dividing resistor that inputs a potential of a power supply output line, an interruption unit that interrupts the output line in response to detecting that the potential of the divided voltage is lower than a set potential, and a connector that externally supplies a voltage of the predetermined type of power supply. The apparatus can detect when the potential of the divided voltage is lower than the set potential for a predetermined period of time, and interrupt the output line of the predetermined type of power supply to prevent overcurrent. This prevents damage to external equipment and ensures safe and reliable power supply.
Problems solved by technology
If the cable transmits a signal having an inappropriate magnitude in voltage or passes a current having an inappropriate magnitude, the device may fail.
However, neither Japanese Patent Laying-open No. 2004-234540 nor 05-215792 specifically discloses a method for preventing an overcurrent flowing through a cable for information equipment including video equipment.
Method used
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[0029] Hereinafter reference will be made to the drawings to describe the present invention in embodiments. In the figures, identical or like components are identically denoted. Accordingly, they will not be described repeatedly in detail.
[0030]FIG. 1 shows a configuration of a system including information equipment in accordance with the present embodiment.
[0031] With reference to FIG. 1, a video system 100 includes sink equipment 1 serving as a video image reproduction circuit, source equipment 2 corresponding to information equipment of the present embodiment, and an HDMI cable 4. “Sink equipment” is equipment receiving a digital video signal. For example it is a TV receiver. “Source equipment” is equipment outputting a digital video signal. For example it is an optical disc reproduction device. A type of optical disc having data reproduced by the optical disc reproduction device is a digital versatile disc (DVD) although it is not limited thereto.
[0032] HDMI cable 4 is connec...
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A microprocessor commonly receives at an A / D port the potentials of the power supplies output from a plurality of types of power supplies (a power supply for HDMI, a power supply for LSI, a power supply for an audio driver IC, and a power supply for a tuner). The A / D port receives the potential of the voltage on an output line of the power supply for HDMI that is divided. If that the potential of the divided voltage is lower than a set potential is detected, the output line is interrupted to interrupt power supply voltage supplied to external equipment.
Description
BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to power supply control apparatuses and particularly to power supply control apparatus having a function supplying power supply voltage to equipment cabled thereto. [0003] 2. Description of the Background Art [0004] Generally in audio and video systems a video signal output device (e.g., an optical disc reproduction device) outputting a video signal and a display or a similar video image display device (e.g., a television (TV) receiver) are connected with a cable. If the cable transmits a signal having an inappropriate magnitude in voltage or passes a current having an inappropriate magnitude, the device may fail. Accordingly in such systems such problem must be prevented. [0005] For example Japanese Patent Laying-open No. 2004-234540 describes that a power supply voltage that is supplied to equipment is divided by a resistor and then input to an analog / digital (A / D) port and measured a...
Claims
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IPC IPC(8): H02H3/00G06F1/26H04N5/44H04N7/173
CPCG06F1/28G06F1/266
InventorUDAGAWA, KAZUHIKO
OwnerFUNAI ELECTRIC CO LTD