Internal power supply of a device

• US 9,600,012 B2
• Filed: 07/26/2013
• Issued: 03/21/2017
• Est. Priority Date: 07/26/2013
• Status: Active Grant

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Maier, Martin, Weiss, Uwe
• Primary Examiner(s): Berhane, Adolf
• Assistant Examiner(s): DEMISSE, AFEWORK S
• Application Number:
  US14/904,767
• Publication Number:
  US 20160170431A1
• Time in Patent Office: 1,334 Days
• Field of Search: 323/304
• US Class Current: 1/1
• CPC Class Codes: G05F 3/04 wherein the variable is ac
• CPC Class Codes: H02H 1/063 primary power being supplied by fault current
• CPC Class Codes: H02H 3/083 for three-phase systems
• CPC Class Codes: H02M 1/0006 Arrangements for supplying an adequate voltage to the control circuit of converters
• CPC Class Codes: H02M 7/217 using semiconductor devices only

Abstract

A device connectable to a three-phase network, wherein the device includes a capacitor, a secondary coil, a diode and, per phase, a conductor and a circuit, where a secondary-side coil is connected in parallel to the capacitor via the diode, the circuit is configured such that a resistor is located in a conductor, a first capacitor is connected parallel to the resistor, a serial circuit of a first primary-side coil is connected in parallel to the first capacitor, energy transfer occurs from a first primary-side coil to a second primary-side coil and to the secondary-side coil, a second capacitor is connected in parallel to the second primary-side coil, the second capacitor is connected to the source connection of a self-conducting field effect transistor, and the gate connection of the self-conducting field effect transistor is connected to the second capacitor to provide an improved internal power supply for the device.

Claims

1. A device connectable to a three-phase supply network, the device comprising:

a third capacitor via which of the device is internally supplied with power;

a secondary-side coil;

a diode;

a conductor for each respective phase of the three-phase supply network; and

a respective circuit for transferring power for each respective phase of the three-phase supply network, the secondary-side coil being connected in parallel with the third capacitor via the diode;

wherein each respective circuit for transferring power comprises a measuring resistor, a first and second capacitor, a self-conducting field effect transistor and a first and second primary-side coil which are each galvanically separated from the secondary-side coil;

wherein each respective circuit for transferring power is configured such that;

the measuring resistor is disposed in the conductor,

the first capacitor is connected in parallel with the measuring resistor,

a series circuit of the first primary-side coil with the self-conducting field effect transistor is connected in parallel with the first capacitor,

the power is transferred from the first primary-side coil to the second primary-side coil, and to the secondary-side coil in an energized state of the conductor,

the second capacitor is connected in parallel with the second primary-side coil,

the second capacitor is connected on an output side to a source connection of the self-conducting field effect transistor, and

a gate connection of the self-conducting field effect transistor is connected on an input side to the second capacitor such that the self-conducting field effect transistor is controlled in a clocked manner in the energized state of the conductor.

2. The device as claimed in claim 1, wherein the circuit further comprises:

a self-blocking field effect transistor which is connected in parallel with the self-conducting field effect transistor,

wherein a gate connection of the self-blocking field effect transistor is connected on an input side to the second capacitor such that the self-blocking field effect transistor is controlled in a clocked manner in the energized state of the conductor.

3. The device as claimed in claim 1, wherein the device further comprises:

a secondary-side coil and a diode for each respective conductor;

wherein the third capacitor is connected on each input side with the diode and each output side with a coil connection of the secondary side coil which does not lead to the diode.

4. The device as claimed in claim 1, wherein the first primary side, the second primary side coil and the secondary-side coil are each formed by a printed circuit board (PCB) coil.

5. The device as claimed in claim 1, wherein the measuring resistor is a shunt.

6. The device as claimed in claim 1, wherein an overcurrent trip for a downstream load occurs by evaluating an output voltage existing across the third capacitor.

7. The device as claimed in claim 1, wherein the internal power supply of the device occurs entirely via an output voltage present on the third capacitor.

8. The device as claimed in claim 1, wherein the first primary-side coil, the second primary-side coil and the secondary-side coil have a shared coil core.

9. The device as claimed in claim 1, for comprising:

a switching element disposed in each respective conductor via which a flow of power across the conductor is interrupted.