[특허]Low cost self-contained transformerless solid state electronic watthour meter having thin film ferromagnetic current sen

Low cost self-contained transformerless solid state electronic watthour meter having thin film ferromagnetic current sen 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01R-021/06 G01R-001/00 G01R-033/00
출원번호	US-0774153 (1985-09-09)
발명자 / 주소	Milkovic Miran (Scotia NY)
출원인 / 주소	General Electric Company (Somersworth NH 02)
인용정보	피인용 횟수 : 31 인용 특허 : 0

초록 ▼

A transformerless, self-contained, low cost, small size, light weight solid state electronic watthour meter is described which employs thin film ferromagnetic current sensors of the type which are magnetically coupled to power conductors whose current flow is to be sensed and metered and which provides electrical isolation between the power conductors and the sensing and metering circuitry. The meter is self-contained in that it draws its operating direct current supply potential required to operate the meter directly from the power conductors being metered and does not require a separate battery or transformer coupled direct current power source. The entire meter circuitry, including the thin film ferromagnetic current sensors which can be fabricated by thin film technology and the direct current power supply and the watthour meter circuitry, all are susceptible of fabrication on a single substrate using semiconductor integrated circuit fabrication techniques.

대표청구항 ▼

A low cost, light weight, small size self-contained transformerless solid state electronic watthour meter fabricated in semiconductor integrated circuit structure form for deriving electric output signals representative of the electric power being supplied through power supply conductors, said meter comprising a low cost, light weight, small size thin film ferromagnetic integrated circuit type current sensing device for mounting adjacent to the power supply conductors by suitable securement means in magnetically coupled relation for sensing the magnitude of electric current flow through the power conductors and deriving a current indicating signal representative thereof, voltage sensing means coupled across a load supplied by the power supply conductors and deriving a voltage indicating signals representative of the magnitude of the load voltage, multiplier circuit means responsive to the current indicating signal and the voltage indicating signal for multiplying the current and voltage indicating signals together and deriving a pulse-width modulated and amplitude modulated product signal representative of the power being supplied to the load, integrator and comparator circuit means responsive to the pulse-width modulated and amplitude modulated product signal for converting the product signal to an output variable pulse rate signal each pulse of which is representative of a known finite quantity of electric energy, the low cost, light weight, small size ferromagnetic current sensing device comprises a thin film magnetoresistive magnetic field sensor formed by semiconductor integrated circuit fabrication techniques on a common substrate with the other components of the solid state meter circuit with the substrate being designed for physical mounting in a magnetically coupled manner to the power supply conductors to be measured, the thin film magnetoresistive magnetic field sensor comprises a balanced Wheatstone bridge with each arm of the bridge comprising a thin film magnetoresistive magnetic field sensor and each field sensor being mounted for magnetic coupling to the power supply conductor to be measured, and with two diagonally opposite terminals of the bridge being connected across the input and output terminals of a constant current amplifier supplied with an input supply current and the two remaining diagonally opposite terminals of the bridge being connected across a set of current indicating input terminals of the multiplier circuit means, the meter circuit further includes automatic error correction circuit means for feeding back an automatic error correcting polarity reversing signal from the output thereof to the input of the multiplier circuit means for alternately reversing the polarity of one of the input signals to the input of the multiplier cirucit means whereby long term errors due to drift and thermal changes are averaged out of the product signal derived by the multiplier circuit means during each quantizing period of operation of the meter and wherein the automatic error correction circuit means automatically feeds back the error correcting, polarity reversing feedback signal to the input of the constant current amplifier as the supply current thereto for supplying the two diagonally opposite terminals of the magnetic field sensor bridge with a constant current excitation signal of opposite polarity during each half cycle of a quantizing period of operation of the meter.

이 특허를 인용한 특허 (31)

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Shuey,Kenneth C., Power supply for an electric meter having a high-voltage regulator that limits the voltage applied to certain components below the normal operating input voltage.
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Rahman Mizanur ; Capriotti Roberto ; Conley Jerry J. ; Mortensen Gary B., Solid state watt-hour meter using GMR sensor.
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Johnson,Mark B., Spin based electronic device.
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Schweitzer, III,Edmund O.; Schweitzer,Edmund A.; Lee,Tony J., Systems and methods for performing a redundancy check using intelligent electronic devices in an electric power system.
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Richard Shaun Welches, Transformerless 3 phase power inverter.
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연합인증

Low cost self-contained transformerless solid state electronic watthour meter having thin film ferromagnetic current sen 원문보기

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