LNB (Low Noise Block) power supply control circuit

Abstract

The invention relates to an LNB (Low Noise Block) power supply control circuit comprising an LNB power switch circuit, a boosted circuit, a square wave control circuit and a voltage conversion control circuit, and also comprising a power switch signal end, a voltage conversion signal end, a square wave signal end, an LNB voltage input end and an LNB voltage output end, wherein the power switch signal end is connected with the input end of the LNB power switch circuit, the output end of the LNB power switch circuit is connected with the input end of the boosted circuit; the voltage conversion signal end is connected with the output end of the voltage conversion control circuit, and the voltage conversion control circuit is connected with the boosted circuit; the square wave control circuit comprises a second diode and a triode, wherein the anode of the second diode is connected with the LNB voltage input end, and the cathode of the second diode is connected with the output end of the boosted circuit; and the triode is connected with the square wave signal end, is used for controlling the conduction or short circuit of the second diode by 22KHZ square wave signals so as to adjust the output voltage of the LNB voltage output end.

Description

technical field [0001] The present invention relates to a digital satellite receiver, more specifically, relates to an LNB power supply control circuit of a digital satellite receiver. Background technique [0002] With the development of digital TV technology, the use of digital satellite receivers is becoming more and more extensive. In the LNB power supply control circuit of the current digital satellite receiver, the voltage of 33v is generally converted to 18V / 13V through the linear regulator LM317. This is not only very inefficient, but also generates a lot of heat, and a large heat sink needs to be installed, resulting in an increase in the cost of the digital satellite receiver. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide an LNB power supply control circuit with low cost, convenient debugging and short-circuit protection function for the above-mentioned defects of the prior art. [0004] The technic...

AI Technical Summary

Problems solved by technology

This is not only inefficient, but also generates a lot of heat, and requires the installation of large heat sinks, resulting in an increase in the cost of digital satellite receivers

Images