Fan speed controller
First Claim
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1. A fan speed controller comprising:
- a pulse width modulation generator for generating a pulse width modulation signal, said pulse width modulation generator further for generating a complement of said pulse width modulation signal, wherein an operating frequency of said pulse width modulation generator is approximately within the range of 200-1,000 KHz; and
a drive stage circuit coupled to said pulse width modulation generator and for switch mode converting a supply voltage into a linear voltage for driving a fan, wherein a voltage level of said linear voltage is a function of said pulse width modulation signal, and wherein said drive stage circuit is further for switch mode converting said supply voltage into said linear voltage in accordance with said pulse width modulation signal and said complement of said pulse width modulation signal.
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Abstract
Embodiments of the present invention provide a low noise and high efficiency fan speed controller. The fan speed controller generates a pulse width modulation signal. The pulse width modulation signal is utilized to switch mode convert a supply voltage into a linear voltage. The voltage level of the linear voltage is a function of the pulse width modulation signal. The linear voltage is utilized to control the operating speed of a direct current fan.
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Citations
25 Claims
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1. A fan speed controller comprising:
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a pulse width modulation generator for generating a pulse width modulation signal, said pulse width modulation generator further for generating a complement of said pulse width modulation signal, wherein an operating frequency of said pulse width modulation generator is approximately within the range of 200-1,000 KHz; and a drive stage circuit coupled to said pulse width modulation generator and for switch mode converting a supply voltage into a linear voltage for driving a fan, wherein a voltage level of said linear voltage is a function of said pulse width modulation signal, and wherein said drive stage circuit is further for switch mode converting said supply voltage into said linear voltage in accordance with said pulse width modulation signal and said complement of said pulse width modulation signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A fan speed controller comprising:
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a pulse width modulation generator for generating a pulse width modulation signal, said pulse width modulation generator further for generating a complement of said pulse width modulation signal, wherein an operating frequency of said pulse width modulation generator is approximately within the range of 200-1,000 KHz; and a drive stage circuit coupled to said pulse width modulation generator and for switch mode converting a supply voltage into a linear voltage for driving a fan, wherein said drive stage circuit is further for switch mode converting said supply voltage into said linear voltage in accordance with said pulse width modulation signal and said complement of said pulse width modulation signal, and wherein said drive stage circuit further comprises; a first transistor having a gate for receiving said pulse width modulation signal and a source coupled to a first potential; a current shunting element having a first terminal coupled to a drain of said first transistor and a second terminal coupled to a second potential; a capacitor having a first terminal coupled to said second terminal of said current shunting element; and an inductor having a first terminal coupled to a second terminal of said capacitor and a second terminal coupled to said first terminal of said current shunting element and to said drain of said first transistor. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method of controlling the speed of a fan, said method comprising:
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generating a pulse width modulated signal, wherein said pulse width modulated signal is approximately within the range of 200-1,000 KHz; generating a complement of said pulse width modulated signal; and switch mode converting a supply voltage into a linear voltage for driving a fan, wherein a voltage level of said linear voltage is a function of said pulse width modulated signal, wherein said switch mode converting further comprises switch mode converting said supply voltage into said linear voltage in accordance with said pulse width modulated signal and said complement of said pulse width modulated signal. - View Dependent Claims (23, 24, 25)
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Specification