Set top box power supply circuit and method for controlling power supply voltage of set top box

Abstract

The embodiment of the invention discloses a method for controlling power supply voltage of a set top box, and the method comprises the following steps that a set top box power supply circuit receives a pulse width modulation signal generated by a main control chip of the set top box; the set top box power supply circuit controls the load voltage value of a feedback circuit in the set top box power supply circuit according to the received pulse width modulation signal; and the set top box power supply circuit supplies voltage to the main control chip of the set top box according to the load voltage resistance of the feedback circuit. By adopting the set top box power supply circuit and the method for controlling the power supply voltage of the set top box, the power supply voltage of the set top box can be dynamically adjusted according to the service of the set top box, the power consumption of the set to box can be effectively reduced, the energy can be saved, the heat radiation design of the set top box main control chip is simplified, the design cost of the set top box is saved, and the miniaturized design of the set top box also can be facilitated.

Description

technical field [0001] The invention relates to the field of digital television, in particular to a set-top box power supply circuit and a method for controlling the set-top box power supply voltage. Background technique [0002] With the continuous development of digital TV, set-top boxes with media access, 3D (There Dimensions, three-dimensional), surround sound technology, games and other functions are becoming more and more popular. As the carrier of the main functions of the set-top box - set-top box SOC (System on a chip) The chip is the main control chip of the set-top box. Its chip architecture and operating system need to enable the digital set-top box to meet more application requirements, such as web browsing, widgets, Flash, audio post-processing and more value-added applications. With the development of SOC chips from single-core to multi-core, the degree of peripheral integration is getting higher and higher, and the operating speed is getting faster and faster...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the power consumption is reduced by increasing the heat dissipation area, increasing the fan or other new heat dissipation methods, but due to the increase of the heat dissipation area, the addition of fans or other new heat dissipation methods, the heat is only dissipated, and the main function of the digital set-top box is The main power consumption of the SOC chip is on the core voltage. The existing heat dissipation method fails to solve the large power consumption problem of the digital set-top box. The existing technology consumes energy, increases the cost, and is not conducive to the shape of the machine. Miniaturization, failed to cater to the mainstream of green, intelligent and environmental protection in the current digital TV

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