Switching Converter

• US 20080116867A1
• Filed: 01/24/2006
• Published: 05/22/2008
• Est. Priority Date: 02/09/2005
• Status: Abandoned Application

• Current Assignee: Thomson Licensing (Vantiva SA)
• Original Assignee: Thomson Licensing (Vantiva SA)
• Inventors: Louvel, Jean-Paul, Koegel, Reinhard
• Application Number:
  US11/883,251
• Publication Number:
  US 20080116867A1
• Time in Patent Office: Days
• US Class Current: 323/282
• CPC Class Codes: H02M 3/156 with automatic control of output voltage or current, e.g. switching regulators

Abstract

The switching converter contains a switching transistor, a first inductance and a first diode, which are connected so as to form a step-down converter for the purpose of producing a first rectified output voltage from an input voltage. The switching transistor is connected on the input side to the input voltage via a second inductance, and a second diode is coupled to a tap being arranged between the second inductance and the switching transistor for the purpose of producing a second rectified output voltage. The second rectified output voltage is in this case unregulated, but can be used in particular as a supply voltage for a television tuner.

Claims

1. Switching converter having a switching transistor, a first inductance and a first diode being arranged as a step-down converter for producing a first rectified output voltage from an input voltage, wherein said switching transistor is coupled with an input terminal to said input voltage via a second inductance, and a second diode is coupled to a tap being arranged between said second inductance and said switching transistor for producing a second rectified output voltage.

2. Switching converter according to claim 1, comprising a control circuit and a feedback loop for stabilizing said first output voltage.

3. Switching converter according to claim 1, wherein said second diode is connected on an anode side to said second inductance for producing a second output voltage, which is higher than said input voltage.

4. Switching converter according to claim 1, the inductance value of said second inductance is less than 30% of the value of said first inductance.

5. Television receiver, comprising a switching converter having a switching transistor, a first inductance and a first diode being arranged as a step-down converter for producing a first rectified output voltage from an input voltage, wherein the switching transistor is coupled with an input terminal to the input voltage via a second inductance, and a second diode is coupled to a tap being arranged between the second inductance and the switching transistor for producing a second rectified output voltage.

6. Television receiver according to claim 5, wherein the television receiver has a switched-mode power supply unit generating the input voltage for the switching converter, and in that the television receiver has a tuner which is connected to the second output voltage.

7. Television receiver according to claim 6, wherein the second output voltage is usable as a tuning voltage for the tuner.