-Specialist in Thin Film Technology-
Susumu Deutschland GmbH8.Various methods of current sensing and advantage of current sensing resistors
8.1 Various methods of current sensing
１) Non-contact current sensing elements
- ・Hall element/sensor/IC
- ・Current transformer
- ・Combination of above two and others
Hall element/sensor
Current transformer
For large current
Advantages
・Sensing large current
・Small power loss
・Minimal influence to surrounding circuits
Disadvantages
・Expensive
・Larger than resistors
・Need space for it on board
２) Contact current sensors
・Low resistance resistors（thin film, thick film, cement）
Pulse shape of cement resistor
ESL affect
pulse shape
Pulse shape of KRL series
Rise and fall are basically intact
General purpose current sensing
Advantages
・Economical and precise
・Small size
・No special space needed
・Can be used for AD or DC
Disadvantages
a) Current loss, self heating
b) Equivalent series inductance (ESL) in high frequency
c) Solder cracks due to thermal coefficient of expansion mismatch
Solution
a) Suppress heat with very low resistance
b) Low ESL structure
c) Use of anti-solder crack adhesive
KRL series
Technical Information
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- 1.Basic knowledge of resistors
- 2.Manufacturing methods and characteristics of thin film resistors
- 3.Performance characteristics of thin film resistors
- 4.High precision and high reliability
- 5.Trimmable chip resistors and altering resistive values
- 6.Application and recommended usage of thin film chip resistors
- 7.Application and recommended usage of small high power thin film ship resistors
- 8.Various methods of current sensing and advantage of current sensing resistors
- 9.Application and recommended usage of current sensing resistors
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Susumu Deutschland GmbH
