Communication system and voltage converter
AssigneeWistron Neweb Corp.
InventorsChen-Chia Huang, Tsung-Hsing Tsai
Life of this patent
Estimating the term…
Abstract
A communication system includes an STB (Set-Top Box), an LNB (Low Noise Block Down Converter), and a voltage converter. The voltage converter is coupled between the STB and the LNB. The voltage converter includes a DC (Direct Current) switch element, a voltage regulator, and a controller. The DC switch element is coupled between an input node and an output node. The voltage regulator is coupled between the input node and the output node. The controller detects an input voltage at the input node. If the input voltage is higher than or equal to a threshold voltage, the controller will open the DC switch element. If the input voltage is lower than the threshold voltage, the controller will close the DC switch element.
Claims14
A communication system, comprising:
- an STB (Set-Top Box);
- an LNB (Low Noise Block Down Converter);
- and
- a voltage converter, coupled between the STB and the LNB, wherein the voltage converter comprises:
- a DC (Direct Current) switch element, coupled between an input node and an output node;
- a voltage regulator, coupled between the input node and the output node;
- and
- a controller, capable of detecting an input voltage at the input node, wherein when the input voltage is higher than or equal to a threshold voltage, the controller opens the DC switch element, and when the input voltage is lower than the threshold voltage, the controller closes the DC switch element;
- wherein the input node of the voltage converter is arranged to receive the input voltage from the STB, and the output node of the voltage converter is arranged to output an output voltage to the LNB;
- wherein the DC switch element comprises:
- a first transistor, wherein the first transistor has a control terminal coupled to a first node, a first terminal coupled to the input node, and a second terminal coupled to the output node;
- wherein the controller comprises:
- a first resistor, wherein the first resistor has a first terminal coupled to the input node, and a second terminal coupled to a second node;
- a second resistor, wherein the second resistor has a first terminal coupled to the second node, and a second terminal coupled to a third node;
- and
- a Zener diode, wherein the Zener diode has an anode coupled to a ground voltage, and a cathode coupled to the third node.
A voltage converter coupled between an STB (Set-Top Box) and an LNB (Low Noise Block Down Converter), comprising:
- a DC (Direct Current) switch element, coupled between an input node and an output node;
- a voltage regulator, coupled between the input node and the output node;
- and
- a controller, detecting an input voltage at the input node, wherein if the input voltage is higher than or equal to a threshold voltage, the controller opens the DC switch element, and if the input voltage is lower than the threshold voltage, the controller closes the DC switch element;
- wherein the input node of the voltage converter is arranged to receive the input voltage from the STB, and the output node of the voltage converter is arranged to output an output voltage to the LNB;
- wherein the DC switch element comprises:
- a first transistor, wherein the first transistor has a control terminal coupled to a first node, a first terminal coupled to the input node, and a second terminal coupled to the output node;
- wherein the controller comprises:
- a first resistor, wherein the first resistor has a first terminal coupled to the input node, and a second terminal coupled to a second node;
- a second resistor, wherein the second resistor has a first terminal coupled to the second node, and a second terminal coupled to a third node;
- and
- a Zener diode, wherein the Zener diode has an anode coupled to a ground voltage, and a cathode coupled to the third node.
Dependencies are inferred from the claim text.