Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
  • H04B1/06—Receivers
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04H—BROADCAST COMMUNICATION
  • H04H40/00—Arrangements specially adapted for receiving broadcast information
  • H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
  • H04H40/27—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
  • H04H40/90—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for satellite broadcast receiving
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
  • H04B1/06—Receivers
  • H04B1/16—Circuits
  • H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
  • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
  • H04B1/40—Circuits

Definitions

• a second input supply voltage is selected to be developed at the input, when the second antenna signal is selected.
• a fault detector is coupled to the switch for changing the switching state in the switch, when the second antenna signal is selected and a fault condition occurs, to select an input supply voltage to be developed at the input that is different from the second input supply voltage.
• FIGURE 1 illustrates a typical satellite receiver system
• FIGURE 3 illustrates a power supply regulator, embodying an inventive feature, which can be incorporated in the satellite receiver system of FIGURE 1 ;
• FIGURE 4 illustrates a flow chart for describing a mode of operation the power supply regulator of FIGURE 3 providing protection by a hardware technique;
• An LNB similar to LNB 86 of FIGURE 1, includes an internal power supply regulator, not shown, for generating an internal supply voltage of 5V, not shown, from voltage Vo at either the 13V level or the 18V level.
• the internal power supply regulator not shown, requires a minimum input supply voltage of 6V for producing the 5V level that is capable of providing the maximum required LNB operation current.
• a maximum LNB operation current can be produced when voltage Vo at at least 6 volts level is applied to LNB 86.
• power supply regulator 10 of FIGURE 3 is designed to supply a maximum current level of an output current IQ when output supply voltage Vo is equal to or greater than 6 volt.
• the relationship between output supply voltage Vo and an output current IQ are shown in FIGURE 2, as explained before.
• MOSFET 51 is turned off by signal 23b to supply, via diode 21, input voltage Ni at approximately 16 volts at the emitter of power transistor Ql .
• This action advantageously, decreases the amount of power that power transistor Ql needs to dissipate.
• the threshold level established by voltage 22a is preferably selected to be lower than the lower voltage level 13V of output voltage Vo, and higher than 6 volts.
• step 114 When the fault condition disappears, as depicted in step 113 of FIGURE 5, normal operation step 114 can resume. On the other hand, if the fault persists, an interval timer step 115 will maintain the 13 volt mode. If fault is not detected in step 111, microprocessor 41 of FIGURE 3 selectively generates signal 23b at the LOW state or at the HIGH state in a step 116. Signal 23b of FIGURE 3 at the HIGH state will cause power supply regulator 10 to operate in the 18 volt mode in which output voltage Vo is 18V, in a manner described before, as depicted in step 117 of FIGURE 5.
• a single input supply voltage 301' is provided, namely the 22 volt supply.
• Power resistor 310' is used to absorb the additional heat generated in the lower 13 volt mode, when the lower level of 13 volts of output voltage V 0 is selected.
• Power resistor 310' can be implemented, for example, by using two resistors coupled across the main current conducting terminals 5 la' and 51b' of MOSFET 51' and having an equivalent value of 9 Ohm.

Landscapes

• Engineering & Computer Science (AREA)
• Signal Processing (AREA)
• Computer Networks & Wireless Communication (AREA)
• Physics & Mathematics (AREA)
• Astronomy & Astrophysics (AREA)
• General Physics & Mathematics (AREA)
• Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
• Continuous-Control Power Sources That Use Transistors (AREA)

Priority Applications (7)

Applications Claiming Priority (2)

Publications (1)

Family

ID=28792017

Family Applications (1)

Country Status (7)

Cited By (1)

Families Citing this family (3)

Citations (4)

Family Cites Families (2)

• 2003
  • 2003-04-03 CN CN038073250A patent/CN1643800B/zh not_active Expired - Fee Related
  • 2003-04-03 EP EP03746133.2A patent/EP1490979B1/en not_active Expired - Lifetime
  • 2003-04-03 KR KR10-2004-7015618A patent/KR20040105835A/ko not_active Abandoned
  • 2003-04-03 MX MXPA04009706A patent/MXPA04009706A/es active IP Right Grant
  • 2003-04-03 JP JP2003582921A patent/JP4369759B2/ja not_active Expired - Fee Related
  • 2003-04-03 WO PCT/US2003/010283 patent/WO2003085850A1/en not_active Ceased
  • 2003-04-03 AU AU2003226246A patent/AU2003226246A1/en not_active Abandoned

Patent Citations (4)

Non-Patent Citations (1)

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