CPU frequency regulating circuit
First Claim
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1. A CPU frequency regulating circuit comprising:
- a detecting circuit coupled to a power circuit of a CPU for receiving and amplifying a load voltage of the power circuit, the detecting circuit comprising an output terminal configured for outputting the amplified load voltage;
a comparing circuit coupled to the detecting circuit for comparing the amplified load voltage with a default voltage, the comparing circuit comprises;
a first comparator;
a second comparator;
a third comparator;
a fourth comparator; and
four voltage dividing circuits corresponding to the first, second, third, and fourth comparators;
each of the first, second, third, and fourth comparators having a non-inverting terminal coupled to the output terminal of the detecting circuit, and an inverting terminal coupled to a corresponding one of the four voltage dividing circuits; and
an adjusting circuit coupled between the comparing circuit and the CPU for selecting a CPU frequency according to a result of the comparison.
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Abstract
An exemplary CPU frequency regulating circuit includes a detecting circuit, a comparing circuit, and an adjusting circuit. The detecting circuit is coupled to a power circuit of a CPU for receiving and amplifying a load voltage. The comparing circuit is coupled to the detecting circuit for comparing the amplified load voltage with a default voltage. The adjusting circuit is coupled between the comparing circuit and the CPU for selecting a CPU frequency according to a result of the comparison. The CPU frequency regulating circuit detects the load voltage of the power circuit of the CPU for selecting an appropriate frequency to the CPU according to a working condition.
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Citations
13 Claims
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1. A CPU frequency regulating circuit comprising:
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a detecting circuit coupled to a power circuit of a CPU for receiving and amplifying a load voltage of the power circuit, the detecting circuit comprising an output terminal configured for outputting the amplified load voltage; a comparing circuit coupled to the detecting circuit for comparing the amplified load voltage with a default voltage, the comparing circuit comprises; a first comparator; a second comparator; a third comparator; a fourth comparator; and four voltage dividing circuits corresponding to the first, second, third, and fourth comparators; each of the first, second, third, and fourth comparators having a non-inverting terminal coupled to the output terminal of the detecting circuit, and an inverting terminal coupled to a corresponding one of the four voltage dividing circuits; and an adjusting circuit coupled between the comparing circuit and the CPU for selecting a CPU frequency according to a result of the comparison. - View Dependent Claims (2, 3, 4)
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5. A frequency regulating circuit for a processor which is capable of working in a plurality of load regions, comprising:
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a detecting circuit coupled to the processor for detecting load of the processor and outputting a voltage signal in response to the load; a comparing circuit coupled to the detecting circuit for identifying the load of the processor belonging to which one of the load regions, the comparing circuit comprising; at least two voltage dividing circuits; at least two comparators corresponding to the at least two voltage dividing circuits; and each of at least two comparators having a non-inverting terminal to receive the voltage signal output by the detecting circuit inverting terminal coupled to corresponding one of the at least two voltage dividing circuits, and an output terminal output voltage signal; and an adjusting circuit coupled between the comparing circuit and the processor, the adjusting circuit comprising a frequency generator capable of generating a plurality of frequencies, and a selecting circuit configured for receiving the voltage signals output by the output terminal of the comparing circuit and controlling the adjusting circuit to selectively output one of the frequencies corresponding to the identified load to the processor. - View Dependent Claims (6, 7, 8)
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9. A CPU frequency regulating circuit comprising:
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a detecting circuit coupled to a power circuit of a CPU for receiving and amplifying a load voltage of the power circuit, wherein the detecting circuit comprises; a first comparator having a non-inverting terminal coupled to a differential voltage terminal in a power circuit of the CPU, an inverting terminal coupled to ground via a first resistor, and an output terminal coupled to the inverting terminal via a second resistor; and a second comparator having a non-inverting terminal coupled to a feedback terminal in the power circuit of the CPU, an inverting terminal coupled to ground via a third resistor, the second resistor, and the first resistor, and an output terminal coupled to the inverting terminal via a fourth resistor and output the amplified load voltage; a comparing circuit coupled to the output terminal of the second comparator to received the amplified load voltage for comparing the amplified load voltage with a default voltage; and an adjusting circuit coupled between the comparing circuit and the CPU for selecting a CPU frequency according to a result of the comparison. - View Dependent Claims (10, 11, 12, 13)
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Specification