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Fan temperature control and speed regulation circuit with working points arranged easily

A working point and circuit technology, applied in pump control, mechanical equipment, non-variable pumps, etc., can solve problems such as the difficulty of simplifying the circuit and the lack of simple formulas for setting the working point of the speed regulating circuit.

Inactive Publication Date: 2014-08-13
姜智康 +1
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

Three states, maintaining running state, variable speed running state, and full speed running state; two points, the starting point of the fan changing from maintaining running to variable speed running, and the transition point from variable speed running to full speed running; when designing the speed regulating circuit, due to three The two points of each state are involved with each other, making it difficult to simplify the circuit; at the same time, the setting of the operating point of the speed control circuit lacks a simple formula, and it is not uncommon to determine the design parameters by means of adjustable resistance experiments.

Method used

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  • Fan temperature control and speed regulation circuit with working points arranged easily
  • Fan temperature control and speed regulation circuit with working points arranged easily
  • Fan temperature control and speed regulation circuit with working points arranged easily

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Embodiment Construction

[0012] Circuit analysis of the first embodiment

[0013] See attached figure 2 , because the analysis is related to the calculation of the operating point, the temperature t must be determined before the analysis 1 , temperature t 2 and maintaining voltage Uo 0 , see attached figure 1 , according to actual needs to determine t 1 , t 2 , refer to the minimum starting voltage data of the DC fan given by the fan manufacturer to determine the maintenance voltage Uo 0 ;

[0014] Maintain voltage Uo 0 The setting of this embodiment circuit is divided by R1 and R2 from the power supply, and the divided voltage Provided to the non-inverting input terminal of op amp A; the temperature sensor RT and R3 divide the voltage from the power supply, and divide the voltage It is provided to the inverting input terminal of operational amplifier A; the temperature sensor RT adopts NTC negative temperature coefficient thermistor. Assume first that both input operating points of the o...

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Abstract

A fan temperature control and speed regulation circuit with working points arranged easily is formed by an operational amplifier, an operational amplifier biasing circuit, a temperature detection circuit, a negative feedback circuit, a limit circuit and a power pushing circuit, wherein the operational amplifier serves as the center. Temperature control and speed regulation functions of a direct current fan are achieved with few elements, the fan temperature control and speed regulation circuit can control the fan to operate at a constant speed, a variable speed or a largest speed, and circuit connotation computational formulas are set for the working points corresponding to the operation modes through corresponding circuits. A detailed working point arrangement method and the computational formulas are provided.

Description

technical field [0001] The invention relates to a temperature control and speed regulation circuit of a DC cooling fan, in particular to the setting of the working point of the temperature control and speed regulation circuit of the fan. Background technique [0002] DC fans are the main heat dissipation tool for equipment. Due to the contradiction between heat dissipation and noise, it has become more and more popular to add speed regulation functions to fans in recent years. The speed regulation of DC fans mainly adopts PWM technology and voltage regulation method. The PWM method is effective, but the cost factor has affected its popularity; The advantages of low cost and independent operation of a self-contained system occupy a large proportion in the DC fan temperature control and speed regulation circuit. [0003] For the basic principle of voltage-regulating temperature-controlled speed-regulating circuit and the problems faced in practice, please refer to the appendi...

Claims

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Application Information

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IPC IPC(8): F04D27/00
Inventor 姜智康姜菡
Owner 姜智康
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