Title:
OVERCURRENT DETECTING CIRCUIT
Document Type and Number:
Japanese Patent JPS6049417
Kind Code:
A
Abstract:
PURPOSE:To detect assuredly a faulty state of a load due to a faulty current by providing a load state detecting means and then switching the set level of an overcurrent in response to the result of detection of said detecting means. CONSTITUTION:A comparator 1 compares the output voltage of a load state detecting circuit with the voltage obtained by giving the voltage conversion 3 to a load current. Now the output voltage Vcmax of a detector 6 is set when loads 4 and 5 equal to a stabilized voltage power supply 2 are loaded; while the output voltage Vcmin is set when only the load 4 is added. Under such conditions, the resistances R1 connected to terminals (a) and (b) of the detector 6 respectively are equal to each other. Thus Vcmin=VcmaxX1/2 is satisfied. This means that the set value of an overcurrent has been switched. In such a way, the overcurrent set value is switched in response to the load state. Thus it is possible to detect assuredly a faulty state of the load that is due to a faulty current.
Inventors:
KOJIMA HIROYUKI
Application Number:
JP15734983A
Publication Date:
March 18, 1985
Filing Date:
August 29, 1983
Export Citation:
Assignee:
NIPPON ELECTRIC CO
International Classes:
G05F1/10; G05F1/573; H02H3/08; (IPC1-7): G05F1/573
Attorney, Agent or Firm:
Uchihara Shin