UNIVERSAL SERIAL BUS CONNECTOR TOUCH ISOLATION
Publication Date: 2013-Jul-04
The IP.com Prior Art Database
The invention proposes a technique to provide supplemental isolation to a USB connector by removing voltage from the USB connector when not in use. The technique utilizes a detector which detects presence of the USB cable. The detector may be a mechanical switch, an optical switch, magnetic detector or other connectors that allow detecting presence of the USB cable. Such detecting device is installed onto the USB interface connector. Isolation by the USB connector protects against electrical shock by removing the voltages from the connectors.
FIELD OF INVENTION
The invention generally relates to a universal serial bus (USB) and more particularly to the USB connector touch isolation.
BACKGROUND OF THE INVENTION
International electrotechnical commission (IEC) 60601 is series of technical standards for safety and effectiveness of medical electrical equipment. IEC 60601 requirements seek protection against leakage current to patients or user by the medical electrical equipment. This current leakage gives electrical shock to patients or users. Voltages are present in areas with a connector, system input and system output also known as (SIP/SOP). The voltage at the connectors needs to be isolated to prevent the patient or user from getting an electric shock on coming in contact with the connectors inadvertently. Isolation can slow down the USB interface to much slower than the 480mbps that may be available without isolation. The standard universal serial bus (USB) 1.1 and 2.0 has connectors with 5 volts and can meet the spacing requirements for 5 VDC. Certain medical devices have single fault condition where voltage exceeds 5V and require 2 means for patient protection (MOPP) for higher voltages or line voltages of 250VAC.
A conventional technique involves use of a USB integrated with a bidirectional digital isolator to isolate the voltage at the connectors. Another conventional technique includes an electronic isolation from connections in ambulatory medical device. Yet another conventional technique includes an apparatus for optical isolation of a USB peripheral from a USB host. However, such conventional techniques provide some form of operational isolation instead of connector isolation.
Therefore, there is a need in the art for a connector interface isolation to save patient or user from current leakage and electrical shocks.
BRIEF DESCRIPTION OF THE INVENTION
The invention proposes a technique to provide supplemental isolation to a USB connector by removing voltage from the USB connector when not in use. The technique utilizes a detector which detects presence of a USB cable. This detecting device is installed onto the USB interface connector. The technique protects against electrical shock by removing the voltages from the connectors.