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Fan drive circuit and fan using same

A driving circuit and driving voltage technology, which is applied in the field of fans and fan driving circuits, and can solve the problems of low triode driving efficiency and other problems

Active Publication Date: 2010-06-23
VERTIV CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a fan drive circuit with high drive efficiency in view of the defect of low drive efficiency caused by the linear amplification of triodes in the DC fan drive circuit of the prior art

Method used

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  • Fan drive circuit and fan using same
  • Fan drive circuit and fan using same
  • Fan drive circuit and fan using same

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Embodiment Construction

[0031] figure 1 It is a functional block diagram of the fan drive circuit of the present invention. The fan drive circuit of the present invention includes a step-down chopper drive circuit 1 for converting an input pulse width modulation signal into a high-frequency fast drive signal and a step-down chopper main circuit 1 for controlling the output fan drive voltage according to the high-frequency fast drive signal. Circuit 2. figure 2 is the circuit principle diagram of the first embodiment of the fan driving circuit of the present invention. like figure 2 As shown, the step-down chopper driving circuit 1 includes triodes Q1, Q2, Q3, Q4, resistors R1, R2, R3, R4, R5, R6, R7, and the base of the triode Q1 is connected to the pulse width modulation signal The input terminal, the emitter is grounded, the collector is connected to the power supply VDC1, the emitter of the triode Q2 is grounded, the base is connected to the collector of the triode Q1, the collector of the tr...

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Abstract

The invention relates to a fan drive circuit and a fan using the same. The fan drive circuit comprises a buck chopping drive circuit (1) used for converting input pulse width modulation signals into high-frequency rapid drive signals and a buck chopping main circuit (2) for controlling and outputting the fan drive voltage according to the high-frequency rapid drive signals. By implementing the fan drive circuit and the fan in the invention, the Buck drive circuit is adopted, thus improving efficiency of the fan drive circuit; the Buck main circuit adopts an MOS tube to drive over the ground, thus facilitating the control of the MOS tube; a Buck inductor is arranged on a negative busbar, and the positive and the negative poles of the fan are in a stable level, thus facilitating voltage detection of the fan, reducing copper sheet area of the jogging level greatly and improving EMC performance obviously; and meanwhile, the fan drive circuit and the fan in the invention also comprise a fan voltage detection unit and a fan fault detection unit, thus facilitating voltage detection and fault identification smoothly.

Description

technical field [0001] The present invention relates to a drive circuit, more specifically, to a fan drive circuit and a fan using the drive circuit. Background technique [0002] With the increasing importance of energy efficiency and environmental protection, people have higher and higher expectations for the efficiency of switching power supplies. High power density and high efficiency have become the development direction of switching power supplies. As for the fan with large power consumption in the switching power supply, the efficiency of its driving circuit directly affects the efficiency of the whole machine. [0003] Most of the existing DC fan drive circuits use linear voltage regulator circuits. This circuit adopts the principle of triode linear amplification, and converts the given power supply voltage into fan speed regulation by adjusting the duty cycle of the input pulse width modulation (PWM) wave. required DC voltage. This circuit has the advantages of DC...

Claims

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Application Information

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IPC IPC(8): H02P7/28
CPCY02P80/10
Inventor 向博
Owner VERTIV CORP
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