HMC1053【PDF 9/11 页】SENSOR MAGNETIC 3-AXIS 16-PLCC

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HMC1051/HMC1052/HMC1053

www.honeywell.com 9

Alternating or Direct Current Sensing

The HMC105X family sensors can be utilized in a novel way for moderate to high current sensing applications using a

nearby external conductor providing the sensed magnetic field to the bridge. Figure 6 shows a HMC1051Z used as a

current sensor with thermistor element performing a temperature compensation function for greater accuracy over a wide

range of operational temperatures. Selection of the temperature compensation (tempco) resistors used depends on the

thermistor chosen and is dependant on the thermistors %/癈 shift of resistance. For best op-amp compatibility, the

thermistor resistance should be above about 1000 ohms. The use of a 9-volt alkaline battery supply is not critical to this

application, but permits fairly common operational amplifiers such as the 4558 types to be used. Note that the circuit

must be calibrated based on the final displacement of the sensed conductor to the measuring bridge. Typically, an

optimally oriented measurement conductor can be placed about one centimeter away from the bridge and have

reasonable capability of measuring from tens of milliamperes to beyond 20 amperes of alternating or direct currents. See

application note AN-209 for the basic principles of current sensing using AMR bridges.

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Figure 5

Magnetic Field Detector

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Figure 6

Current Sensor

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