Power supply circuit of an excitation coil of an electromagnet
First Claim
1. A power supply circuit, using direct current or rectified alternating current sources having output and return supply lines, for a coil of an electromagnet having at least one primary winding and a secondary winding, comprising:
- a first semiconductor element having a gate and a source drain path and capable of providing or blocking a supply of current to the secondary winding, the source drain path connected between the secondary winding and the return supply line; and
a switching means connected between the primary winding and the gate of the first semiconductor element, including,a second semiconductor element having a gate and a source drain path and capable of keeping the first semiconductor element from conducting when a voltage between the gate of the second semiconductor element and the return supply line reaches a threshold voltage greater than a value corresponding to a start of a closing of the electromagnet, the source drain path of the second semiconductor element connected between the gate of the first semiconductor element and the return supply line, andan adaptation circuit connected between the primary winding and the gate of the second semiconductor element, said adaptation circuit estimating a voltage representative of an image of a current circulating in the primary winding and integrating the circulating current to adapt a time required to reach an activation threshold of the second semiconductor element.
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Accused Products
Abstract
A power supply circuit, using direct current or rectified alternating current sources having output and return supply lines (a, b), for a coil of an electromagnet having at least one principal winding (B1) and a secondary winding (B2). The power supply circuit includes a first semiconductor element (T2) having a gate and a source drain path and capable of providing or blocking a supply of current to the secondary winding (B2), the source drain path connected between the secondary winding (B2) and the return supply line (b); and a switching means (10) connected between the primary winding (B1) and the gate of the first semiconductor element (T2). The switching means (10) includes a second semiconductor element (T1) having a gate and a source drain path and capable of keeping the first semiconductor element (T2) from conducting when a voltage between the gate of the second semiconductor element (T1) and the return supply line (b) reaches a threshold voltage (Vs) greater than a value (V1) corresponding to a start of a closing of the electromagnet, the source drain path of the second semiconductor element (T1) connected between the gate of the first semiconductor element (T2) and the return supply line (b), and an adaptation circuit connected between the primary winding (B1) and the gate of the second semiconductor element (T1).
12 Citations
20 Claims
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1. A power supply circuit, using direct current or rectified alternating current sources having output and return supply lines, for a coil of an electromagnet having at least one primary winding and a secondary winding, comprising:
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a first semiconductor element having a gate and a source drain path and capable of providing or blocking a supply of current to the secondary winding, the source drain path connected between the secondary winding and the return supply line; and a switching means connected between the primary winding and the gate of the first semiconductor element, including, a second semiconductor element having a gate and a source drain path and capable of keeping the first semiconductor element from conducting when a voltage between the gate of the second semiconductor element and the return supply line reaches a threshold voltage greater than a value corresponding to a start of a closing of the electromagnet, the source drain path of the second semiconductor element connected between the gate of the first semiconductor element and the return supply line, and an adaptation circuit connected between the primary winding and the gate of the second semiconductor element, said adaptation circuit estimating a voltage representative of an image of a current circulating in the primary winding and integrating the circulating current to adapt a time required to reach an activation threshold of the second semiconductor element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification