Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Magnetic saturation
Patent
1999-06-08
2000-10-24
Metjahic, Safet
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Magnetic saturation
324117R, G01R 3300
Patent
active
061372846
ABSTRACT:
A method and apparatus capable of detecting a considerably high voltage of a power supply while preventing an increase in the size and cost of circuitry, an increase in the amount of heat being generated, and a reduction in the detection accuracy of the circuitry. The voltage of a power supply to be detected is divided by way of a voltage-dividing resistor array. An voltage-to-current converter converts a potential difference appearing across the second voltage-dividing resistor in the array into a primary current so as to correspond to the potential difference. The converted primary current flows through a primary winding and an energization resistor. A second magnetic flux develops in a magnetic core from a secondary current, which flows through the secondary winding from a current buffer on the basis of the voltage output from a hole element according to the primary current. This second magnetic flux cancels the primary magnetic flux developed in the magnetic core from the primary current flowing through the primary winding and an energization load. As a result, a potential difference, which can be used for detecting the voltage of the power supply, develops across a detection load connected to the secondary winding.
REFERENCES:
patent: 4215310 (1980-07-01), Schwerer
patent: 4901008 (1990-02-01), Quastel et al.
patent: 5296802 (1994-03-01), Beranger et al.
patent: 5438258 (1995-08-01), Maruyama
patent: 5497077 (1996-03-01), Nukui
patent: 5764047 (1998-06-01), Massie
patent: 5952819 (1999-09-01), Berkcan et al.
Arai Youichi
Nakajima Kiyoshi
Satake Syuji
Metjahic Safet
Nguyen Vincent Q.
Yazaki -Corporation
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