SUPPLY CIRCUIT FOR A MOTOR DISPOSING OF AN ELEMENT PROVIDING FOR POWER SWITCHING, A PROTECTION AGAINST POLARITY INVERSION AND AN ELEMENT FOR LIMITING THE INRUSH CURRENT OF A CAPACITIVE ELEMENT

• US 20100045257A1
• Filed: 07/20/2007
• Published: 02/25/2010
• Est. Priority Date: 07/21/2006
• Status: Active Grant

• Current Assignee: Valeo Systemes De Controle Moteur (Valeo SE)
• Original Assignee: Valeo Systemes De Controle Moteur (Valeo SE)
• Inventors: Tihy, Mickael, Plaideau, Michel
• Granted Patent: US 8,331,119 B2
• Time in Patent Office: Days
• US Class Current: 323/304
• CPC Class Codes: H02J 7/0031 using battery or load disconnect circuits H02J9/002 takes precedence

Abstract

Supply circuit (3) for an electric apparatus (1) having a positive supply line (5) and a negative supply line, to which lines a polarity inversion detection module (18), an inrush current module (18) and a capacitive filter element (14) are connected, wherein the capacitive filter element is mounted on a secondary line (15), the ends of which are connected to the positive and negative line, respectively; the circuit comprising a first MOSFET transistor (16) channel N and a second MOSFET transistor (17) channel N mounted in series on the positive line, wherein the first transistor has a gate which is connected to the inrush current detection module and the second transistor has a drain which is connected to the positive line prior to the point of connection between the positive line and the secondary line and a gate which is connected to the polarity inversion detection module.

Claims

1. A power supply circuit for electrical equipment, comprising:

a positive supply rail; and

a negative supply rail to which an inrush current limitation module and a capacitive filtering element are connected, wherein the capacitive filtering element is mounted on a second line having ends respectively connected to the positive rail and to the negative rail;

a first n-channel MOSFET transistor and a diode mounted in series on the positive rail,

wherein the first transistor has a gate connected to the inrush current limitation module, and

wherein the diode comprises a cathode connected to the positive rail upstream of the link from the positive rail to the secondary line.

2. The circuit as claimed in claim 1, in which the first transistor has a drain connected to a connecting terminal from the positive rail to a device for supplying energy and a source connected to an anode of the diode.

3. The circuit as claimed in claim 1, in which the diode is an intrinsic diode of a second n-channel MOSFET transistor having a drain connected to the positive rail upstream of the link from the positive rail to the secondary line.

4. The circuit as claimed in claim 3, in which said second transistor has a source connected to the source of the first transistor and a gate connected to a control module.

5. The circuit as claimed in claim 4, comprising an additional source of energy having a positive rail with a first branch connected to the gate of the second transistor and a ground rail connected to the sources of the first transistor and of the second transistor.

6. The circuit as claimed in claim 5, in which the positive rail coming from the additional source of energy comprises a second branch connected to the negative rail, and in which a branch, to which the gate of the first transistor is connected, runs between the drain of the first transistor and the ground rail and incorporates a transistor having a base connected to the second branch and a collector connected to the ground rail.

7. An electrical system incorporating a power supply circuit as claimed in claim 1.