Temperature-controlled speed-regulating circuit for direct-current fan
A DC fan and circuit technology, applied in the direction of temperature control, control/regulation system, pump control, etc., can solve the problems of complex temperature control circuit, high cost, large number of components, etc., to achieve simple circuit, low cost and reliability. high effect
Active Publication Date: 2013-01-02
BEIJING MECHANICAL EQUIP INST
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Problems solved by technology
[0004] The purpose of the present invention is to provide a DC fan temperature control and speed regulation circuit to solve the problems of the current DC fan PWM speed regulation control temperature control circuit is relatively complicated, the number of components is large, and the cost is high
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[0011] A DC fan temperature control and speed regulation circuit, including: resistor R1, resistor R2, resistor R3, resistor R4, potentiometer RP, negative temperature coefficient thermistor RT and operational amplifier N1, also includes: resistor R5, resistor R6, resistor R7, resistor R8, resistor R9, resistor R10, capacitor C1, capacitor C2, operational amplifier N2 and power MOSFET tube.
[0012] One end of the resistor R1 is connected to the positive pole VCC of the power supply, the other end of the resistor R1 is connected to the positive input end of the operational amplifier N1 and one end of the potentiometer RP and the active end, and the other end of the potentiometer RP is connected to one end of the negative temperature coefficient thermistor RT. The other end of the negative temperature coefficient thermistor RT is connected to the power ground GND. One end of the resistor R2 is connected to the positive pole VCC of the power supply, and the other end of the resi...
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The invention discloses a temperature-controlled speed-regulating circuit for a direct-current fan. The temperature-controlled speed-regulating circuit comprises resistors R1-R10, a potentiometer RP, a thermistor RT, an operational amplifier N1, a capacitor C1, a capacitor C2, an operational amplifier N2 and a power MOSFET (metal-oxide -semiconductor field effect transistor). The positive pole of the controlled direct-current fan is connected with the positive pole VCC of a power supply, and the negative pole of the controlled direct-current fan is connected with an output FAN 1 of the circuit. In the working process, the circuit carries out detection on temperatures through the thermistor RT, carries out compensation control through the potentiometer RP, the resistors R1-R4 and the operational amplifier N1, and generates PWM (pulse-width modulation) signals through the capacitor C1, the capacitor C2, the resistors R5-R10 and the operational amplifier N2 to drive the MOSFET to control the rotation of the direct-current fan. The circuit realizes the temperature-controlled stepless speed regulation of the direct-current fan, and solves the problems that the existing PWM temperature-controlled speed-regulating circuit for the direct-current fan is relatively complicated, needs more elements and is high in cost.
Description
technical field [0001] The invention relates to a temperature control and speed regulation circuit, in particular to a temperature control and speed regulation circuit of a DC blower. Background technique [0002] In order to control the temperature in the heat-generating electronic equipment chassis to a certain range, DC fans are often used to control the air volume in and out. The DC fan temperature control and speed regulation circuit is usually composed of temperature sensitive devices (thermistors, etc.), comparators and drive components (switch tubes, etc.). When it is at the set value, the comparator outputs a high level, the control drive element is powered on, the fan rotates at the rated speed, the electronic equipment starts forced convection heat dissipation, and the internal temperature of the chassis begins to drop; when the temperature is lower than the set value, the comparator Output low level, control the driving element to disconnect the power supply of ...
Claims
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Login to View More IPC IPC(8): F04D27/00G05D23/24
Inventor 熊永波
Owner BEIJING MECHANICAL EQUIP INST