LOAD DRIVING CIRCUIT - NIPPON SIGNAL CO LTD

Title:

LOAD DRIVING CIRCUIT

Document Type and Number:

WIPO Patent Application WO/1998/010452

Kind Code:

A1

Abstract:

A load driving circuit in which an emergency switch for forced stoppage and a service switch for controlling current are connected in series with a load power-feeding circuit. An emergency switch (SW�A?) and a service switch (SW�B?) are connected in series with the load power-feeding circuit and the switch (SW�B?) is periodically turned off for a short time in accordance with the control signal (X) of a service switch control circuit (30). The turn-off state of the switch (SW�B?) is monitored through the output signal (AC) of a monitoring circuit (40). When the output signal (AC) of the circuit (40) is not generated for more than the off-delay time of an off-delay circuit (21), the control signal (Z) of an emergency switch control circuit (20) is stopped and the switch (SW�A?) is forcedly turned off.

Inventors:

SAKAI MASAYOSHI (JP)
FUTSUHARA KOICHI (JP)

Application Number:

PCT/JP1997/002038

Publication Date:

March 12, 1998

Filing Date:

June 12, 1997

Export Citation:

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Assignee:

NIPPON SIGNAL CO LTD (JP)
SAKAI MASAYOSHI (JP)
FUTSUHARA KOICHI (JP)

International Classes:

B30B15/28; F16P3/12; F16P3/14; H01H9/54; H01H47/00; H03K17/18; (IPC1-7): H01H9/54

Domestic Patent References:

WO1996030923A1

1996-10-03

Foreign References:

JPH05325766A	1993-12-10
JPH054656Y2	1993-02-05

Other References: