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Current sensors and methods of improving accuracy thereof

A current and circuit technology, applied in the field of current sensors and improving their accuracy, can solve problems such as errors, significant changes in load current, and catastrophes

Active Publication Date: 2016-10-05
INFINEON TECH AUSTRIA AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This variation can cause significant variation or error in the calculated load current with disastrous consequences

Method used

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  • Current sensors and methods of improving accuracy thereof
  • Current sensors and methods of improving accuracy thereof
  • Current sensors and methods of improving accuracy thereof

Examples

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Embodiment Construction

[0018] Integrated switches are replacing typical relays in more and more applications. The main advantage of an integrated solution is the possibility to integrate the drive and protection functions together with the actual switch, making the control of the power devices easier and increasing the robustness of the application.

[0019] In many applications, switches are used to connect different types of loads. For example, load types can vary from LEDs and relays to light bulbs and DC motors, resulting in a wide range of required switching currents and resistances. The switch can be connected between the load and ground (often called a low-side switch) or between the power supply and the load (respectively called a high-side switch).

[0020] A critical function required in power devices is protection against short circuit conditions. Many topologies have been implemented for measuring load current and protecting active devices by disconnecting or limiting the current. For...

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Abstract

The present invention relates to current sensors and methods of improving accuracy thereof. A method for operating a circuit includes providing a three terminal main transistor and a four terminal sense transistor having a field plate. The method includes simultaneously applying a gate pulse on a gate terminal of the sense transistor and a gate terminal of the main transistor, and applying a field plate pulse on a field plate of the sense transistor. The field plate pulse is synchronous and in phase with the gate pulse.

Description

technical field [0001] The present invention relates generally to circuits and, in particular embodiments, to current sensors and methods of increasing their accuracy. Background technique [0002] Semiconductor devices are used in many electronic and other applications. Semiconductor devices include integrated circuits or discrete devices that are formed on semiconductor wafers by depositing many types of thin films of material over the semiconductor wafer and patterning the thin films of material to form integrated circuits. [0003] Electronic switches such as MOSFETs, IGBTs or other types of transistors are widely used as electronic switches for switching electrical loads such as motors, lamps, solenoid valves and the like. In these applications, the electronic switch is connected in series with the load, wherein the series circuit with the electronic switch and the load is connected between the supply terminals. The load can be turned on and off by turning the electro...

Claims

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Application Information

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IPC IPC(8): H01L27/06H01L29/78H01L29/40
CPCH01L27/06H01L29/40H01L29/402H01L29/78H03K2217/0027H01L29/7815H01L29/7835H01L29/2003H01L2924/181H01L2224/40245H01L2224/48247H01L2924/00014H01L29/407H01L29/42368H01L24/16H01L24/40H01L24/48H01L29/7813H01L2224/16245H01L2224/48464H01L2224/73221H01L2924/13055H01L2924/13091H01L2924/00012H01L2224/37099H01L2224/45099H01L2224/13099H01L2224/05599H01L2924/00H01L2224/84
Inventor M·金O·布兰科R·刚里诺
Owner INFINEON TECH AUSTRIA AG