Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Reexamination Certificate
1998-07-24
2001-07-17
Karlsen, Ernest (Department: 2858)
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
Reexamination Certificate
active
06262590
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a supply voltage abnormal condition indicating device adapted to indicate that a power supply or supplies are abnormal.
2. Description of the Related Art
A multi-system power supply circuit providing a plurality of power supplies different in power system is known in the art.
Heretofore, in order to determine whether or not any one of the power supplies of the multi-system power supply circuit is abnormal, it is tested with a voltage tester or the like. This conventional technique is disadvantageous in the following point: For instance in the case where a television set is repaired, it is necessary to measure each of the output voltages of the multi-system power supply circuit with a volt meter. This is low in work efficiency. That is, it takes much time and labor to repair the television set.
SUMMARY OF THE INVENTION
In view of the foregoing, an object of the invention is to provide a supply voltage abnormal condition indicating device which indicates any one of power supplies of a multi-system power supply circuit which is out of order or in abnormal condition in an electronic device such as a television set.
In order to achieve the above object, the invention provides a supply voltage abnormal condition indicating device comprising: a multi-system power supply circuit which provides power supplies different in power system; signal generating circuits which correspond to the power systems of the power supply circuit, and generate signals of repetitive frequencies corresponding to the number of the power systems of the power supply circuit; a detection indicating circuit to which output signals of the signal generating circuits are supplied; and control circuits which are connected to the power system of the power supply circuit respectively, and perform control so that, when a certain power system of the power supply circuit becomes abnormal in output voltage, a signal of a repetitive frequency corresponding to the certain power system is supplied to the detection indicating circuit from the signal generating circuit, wherein the detection indicating circuit indicates that the certain power system is abnormal.
Further, the invention provides a supply voltage abnormal condition indicating device comprising: a multi-system power supply circuit which provides power supplies different in power system; signal generating circuits which correspond to the power systems of the power supply circuit, and generate signals of repetitive frequencies corresponding to the number of the power systems of the power supply circuit; a detection indicating circuit to which output signals of the signal generating circuits are supplied; control circuits which are connected to the power system of the power supply circuit respectively, and perform control so that, when a certain power system of the power supply circuit becomes abnormal in output voltage, a signal of a repetitive frequency corresponding to the certain power system is supplied to the detection indicating circuit from the signal generating circuit; and a time sequential switching control circuit which starts its operation when a plurality of power systems of the power supply circuit become abnormal, and performs control so that signals of repetitive frequencies corresponding to the plurality of power systems are supplied sequentially with time shift from the signal generating circuits to the detection indicating circuit, wherein the detection indicating circuit indicates that the plurality of power systems are abnormal.
Further, the invention provides a supply voltage abnormal condition indicating device comprising: a multi-system power supply circuit which provides power supplies different in power system; indicating voltage generating circuits which correspond to the power systems of the power supply circuit, and generates voltage corresponding to the number of the power systems of the power supply circuit; a detection indicating circuit to which output signals of the indicating voltage generating circuits are supplied; and control circuits which are connected to the power system of the power supply circuit respectively, and perform control so that, when a certain power system of the power supply circuit becomes abnormal in output voltage, a voltage corresponding to the certain power system is supplied to the detection indicating circuit from the indicating voltage generating circuit, wherein the detection indicating circuit indicates that the certain power system is abnormal.
Further, the invention provides a supply voltage abnormal condition indicating device comprising: a multi-system power supply circuit which provides power supplies different in power system; indicating voltage generating circuits which correspond to the power systems of the power supply circuit, and generates voltage corresponding to the number of the power systems of the power supply circuit; a detection indicating circuit to which output signals of the indicating voltage generating circuits are supplied; control circuits which are connected to the power system of the power supply circuit respectively, and perform control so that, when a certain power system of the power supply circuit becomes abnormal in output voltage, a voltage corresponding to the certain power system is supplied to the detection indicating circuit from the indicating voltage generating circuit; and a time sequential switching control circuit which starts its operation when a plurality of power systems of the power supply circuit become abnormal, and performs control so that voltages corresponding to the plurality of power systems are supplied sequentially with time shift from the indicating voltage generating circuit to the detection indicating circuit, wherein the detection indicating circuit indicates that the plurality of power systems are abnormal.
REFERENCES:
patent: 4149149 (1979-04-01), Miki et al.
patent: 4276605 (1981-06-01), Okamoto et al.
patent: 4296375 (1981-10-01), Takezaki
Funai Electric Co. Ltd.
Karlsen Ernest
Lackenbach Siegel Marzullo Aronson & Greenspan
Tang Minh
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