Invention Grant
- Patent Title: Transmission input circuit
- Patent Title (中): 传输输入电路
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Application No.: US13121866Application Date: 2009-10-02
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Publication No.: US08362808B2Publication Date: 2013-01-29
- Inventor: Mitsuhiro Kurimoto
- Applicant: Mitsuhiro Kurimoto
- Applicant Address: JP Tokyo
- Assignee: Hochiki Corporation
- Current Assignee: Hochiki Corporation
- Current Assignee Address: JP Tokyo
- Agency: Wood, Herron & Evans, LLP
- Priority: JP2008-257172 20081002
- International Application: PCT/JP2009/005116 WO 20091002
- International Announcement: WO2010/038480 WO 20100408
- Main IPC: H03K5/153
- IPC: H03K5/153 ; H03K5/22

Abstract:
A transmission input circuit of the present invention is provided with: a current detection resistor which receives an input of a line current flowing through a transmission line and generates a line current detection voltage; a constant current circuit which generates a predetermined reference current; a first switch which performs a switching operation at an empty timing where a transmission current is not flowing, to thereby allow the reference current to flow from the constant current circuit to the current detection resistor, and generate a reference voltage, in which a threshold voltage corresponding to the reference current is added to a load current detection voltage corresponding to the load current; a capacitor which is connected to the current detection resistor via the first switch; a second switch which performs a switching operation in synchronization with the first switch to thereby sample-hold the reference voltage generated by the current detection resistor in the capacitor; and a comparator which receives an input of the line current detection voltage generated by means of the current detection resistor, to one of input terminals, receives an input of the reference voltage held in the capacitor to an other input terminal, and outputs a voltage component of the line current detection voltage which exceeds the reference voltage, as a transmission current detection signal.
Public/Granted literature
- US20110187415A1 TRANSMISSION INPUT CIRCUIT Public/Granted day:2011-08-04
Information query
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