Solid state relay
First Claim
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1. A solid state relay comprising:
- a) at least one power semiconductor including a gate electrode and having two electrodes defining a main path;
b) at least one current detector coupled to the main path of the power semiconductor and providing a signal which is a function of an absolute value of the current in the main path, wherein the at least one current detector includes a sensor having a ferromagnetic core at least partially surrounding the main path, a coil wound at least partially around the core, an oscillator generating a carrier signal coupled to the sensor and a detection circuit coupled to the sensor; and
c) an evaluation circuit coupled to the current detector for receiving said signal and producing an output signal coupled to said gate electrode of said power semiconductor.
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Abstract
A solid state relay includes a power semiconductor controlled by a gate electrode. A current detector provides a signal which is a function of the absolute value of the current through the power semiconductor. An evaluation circuit coupled to the current detector receives the current signal. The current detector may include a ferromagnetic core surrounding a conductor coupled to the power semiconductor, a coil wound around the core, and an oscillator generating a carrier signal and a detection circuit, both coupled to the core. The current detector is used to control latching of the relay and to generate status signals if predetermined parameters are exceeded.
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Citations
29 Claims
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1. A solid state relay comprising:
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a) at least one power semiconductor including a gate electrode and having two electrodes defining a main path; b) at least one current detector coupled to the main path of the power semiconductor and providing a signal which is a function of an absolute value of the current in the main path, wherein the at least one current detector includes a sensor having a ferromagnetic core at least partially surrounding the main path, a coil wound at least partially around the core, an oscillator generating a carrier signal coupled to the sensor and a detection circuit coupled to the sensor; and c) an evaluation circuit coupled to the current detector for receiving said signal and producing an output signal coupled to said gate electrode of said power semiconductor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification