POWER SUPPLY CIRCUIT AND METHOD FOR ADJUSTING OUTPUT VOLTAGE THEREIN
First Claim
Patent Images
1. A power supply circuit, comprising:
- a regulator having an input terminal receiving an input voltage, an output terminal outputting an output voltage and a regulating terminal;
a voltage divider coupled between the output terminal and a ground, generating a dividing voltage; and
a gain circuit coupled between the regulating terminal and the voltage divider, receiving the dividing voltage and generating a gain for adjusting the output voltage according to a reference voltage.
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Abstract
A power supply circuit and a method for adjusting an output voltage therein are provided. The power supply circuit includes a regulator having an input terminal receiving an input voltage, an output terminal outputting an output voltage and a regulating terminal, a voltage divider coupled between the output terminal and a ground, generating a dividing voltage, and a gain circuit coupled between the regulating terminal and the voltage divider, receiving the dividing voltage and generating a gain for adjusting the output voltage according to a reference voltage.
7 Citations
20 Claims
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1. A power supply circuit, comprising:
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a regulator having an input terminal receiving an input voltage, an output terminal outputting an output voltage and a regulating terminal; a voltage divider coupled between the output terminal and a ground, generating a dividing voltage; and a gain circuit coupled between the regulating terminal and the voltage divider, receiving the dividing voltage and generating a gain for adjusting the output voltage according to a reference voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for adjusting an output voltage in a power supply circuit, comprising steps of:
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providing a regulator having an input terminal for receiving an input voltage, an output terminal and a regulating terminal; determining a reference voltage; providing a gain circuit coupled between the output terminal and the regulating terminal and generating a gain; and adjusting the gain so as to adjust the output voltage. - View Dependent Claims (14, 15, 16)
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17. A method for adjusting an output voltage in a power supply circuit, comprising the steps of:
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providing a regulator having an input terminal for receiving an input voltage, an output terminal and a regulating terminal; determining a reference voltage; providing an operational amplifier coupled between the output terminal and the regulating terminal, wherein the operational amplifier has a non-inverting input, an inverting input and an amplifier output; providing an input resistor coupled between the inverting input and a ground, and a feedback resistor coupled between the inverting input and the amplifier output; and generating a variation of a gain by adjusting the ratio of the feedback resistor over the input resistor so as to compare the gain with the reference voltage and thereby adjusting the output voltage. - View Dependent Claims (18)
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19. A power supply circuit, comprising:
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a regulator having an input terminal receiving an input voltage, an output terminal outputting an output voltage and a regulating terminal; a first resistor coupled to the output terminal; a second resistor coupled to the first resistor at a node and coupled to a ground; an operational amplifier coupled between the regulating terminal and the node and having a non-inverting input, an inverting input and an amplifier output; an input resistor coupled between the inverting input and the ground; and a feedback resistor coupled between the inverting input and the amplifier output, thereby adjusting the ratio of the feedback resistor over the input resistor to generate a gain so as to adjust the output voltage. - View Dependent Claims (20)
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Specification