Current limiter for AC load
First Claim
1. A protection circuit for an electrical consumer, comprising:
- an input interface comprising first and second input terminals for the application of an alternating potential difference;
an output interface comprising first and second output terminals for the connection of an electrical consumer;
a current sensor connected between the second input terminal and the second output terminal;
further comprising;
first and second high electron mobility field-effect transistors of normally closed type connected in series with the current sensor between the second input terminal and the second output terminal, the first and second transistors being connected in series by way of a connection node;
a transformer, a primary winding of which is connected to the terminals of the current sensor, and comprising a secondary winding;
a rectifier bridge exhibiting two input terminals connected to the terminals of the said secondary winding, and exhibiting first and second output terminals between which an electrical load is connected, the first output terminal of the rectifier bridge being connected to a control gate of the first transistor and to a control gate of the second transistor, the second output terminal of the rectifier bridge being connected to said connection node.
1 Assignment
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Accused Products
Abstract
A protection circuit including an input interface; an output interface; a current sensor connected between an input terminal and an output terminal; first and second HEMT transistors of normally closed type connected in series with the current sensor and connected in series by way of a connection node; a transformer, a primary winding of which is connected to the terminals of the current sensor; a rectifier bridge exhibiting two input terminals connected to the terminals of a secondary winding of the transformer, and exhibiting output terminals, an output terminal of the rectifier bridge being connected to the control gates of the transistors, an output terminal of the rectifier bridge being connected to the connection node.
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Citations
15 Claims
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1. A protection circuit for an electrical consumer, comprising:
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an input interface comprising first and second input terminals for the application of an alternating potential difference; an output interface comprising first and second output terminals for the connection of an electrical consumer; a current sensor connected between the second input terminal and the second output terminal; further comprising; first and second high electron mobility field-effect transistors of normally closed type connected in series with the current sensor between the second input terminal and the second output terminal, the first and second transistors being connected in series by way of a connection node; a transformer, a primary winding of which is connected to the terminals of the current sensor, and comprising a secondary winding; a rectifier bridge exhibiting two input terminals connected to the terminals of the said secondary winding, and exhibiting first and second output terminals between which an electrical load is connected, the first output terminal of the rectifier bridge being connected to a control gate of the first transistor and to a control gate of the second transistor, the second output terminal of the rectifier bridge being connected to said connection node. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A protection circuit for an electrical consumer, comprising:
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an input interface comprising first and second input terminals for the application of an alternating potential difference; an output interface comprising first and second output terminals for the connection of an electrical consumer; a current sensor connected between the second input terminal and the second output terminal; further comprising; a high electron mobility field-effect bidirectional transistor of normally closed type comprising an electron gas layer, said transistor being connected in series by first and second conduction electrodes between the second input terminal and the second output terminal, the current sensor measuring the current passing through the bidirectional transistor, said bidirectional transistor comprising a reference electrode disposed plumb with the electron gas layer in an intermediate position between the first and second conduction electrodes, and the reference electrode being at the potential of the electron gas layer situated plumb therewith; a transformer, a primary winding which is connected to the terminals of the current sensor, and comprising a secondary winding; a rectifier bridge exhibiting two input terminals connected to the terminals of said secondary winding, and exhibiting first and second output terminals between which an electrical load is connected, the first output terminal of the rectifier bridge being connected to a control gate of the bidirectional transistor, the second output terminal of the rectifier bridge being connected to said reference electrode. - View Dependent Claims (14, 15)
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Specification