CN215805346U - Temperature control fan for power supply heat dissipation - Google Patents
Temperature control fan for power supply heat dissipation Download PDFInfo
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- CN215805346U CN215805346U CN202120424916.5U CN202120424916U CN215805346U CN 215805346 U CN215805346 U CN 215805346U CN 202120424916 U CN202120424916 U CN 202120424916U CN 215805346 U CN215805346 U CN 215805346U
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Abstract
The utility model relates to a temperature control fan for power supply heat dissipation, which comprises a temperature sensor, an MCU, a signal isolator, an IGBT (insulated gate bipolar transistor) Q1, a diode D1, an inductor L1, a capacitor C2, a resistor R4, a resistor R5, a 12V power supply and a fan, wherein the temperature sensor is connected with the MCU; the output end of the temperature sensor is connected with an MCU (microprogrammed control Unit), the MCU is connected with a G pole of an IGBT (insulated gate bipolar transistor) Q1 through a signal isolator, the 12V power supply is sequentially connected with a diode D1 and a resistor R5 in series to a C pole of the IGBT Q1, an E pole of the IGBT Q1 is grounded, the conduction direction of the diode D1 points to the 12V power supply, the anode of the diode D1 is sequentially connected with the cathode of a diode D1 through an inductor L1 and a fan, one end of the capacitor C2 is connected with a joint between an inductor L1 and the fan, the other end of the capacitor C2 is connected with the cathode of the diode D1, and the resistor R4 is bridged between the G pole of the IGBT Q1 and the ground. The temperature control fan for power supply heat dissipation has stable work and small output ripple waves.
Description
Technical Field
The utility model relates to the field of heat dissipation, in particular to a temperature control fan for power supply heat dissipation.
Background
The existing temperature control fan is basically composed of a temperature sensor, a controller, a driving circuit and a fan, in order to match PWM driving, the core of the driving circuit is implemented by adopting a switch tube, and high-frequency burrs output to the fan from the rear end of the driving circuit are more, so that the service life of the fan is shortened, and the defect of unstable control exists.
SUMMERY OF THE UTILITY MODEL
The utility model provides the temperature control fan for heat dissipation of the power supply, which has stable work and small output ripples and is used for solving the defects in the prior art.
The temperature control fan for power supply heat dissipation comprises a temperature sensor, an MCU (microprogrammed control Unit), a signal isolator, an IGBT (insulated gate bipolar transistor) Q1, a diode D1, an inductor L1, a capacitor C2, a resistor R4, a resistor R5, a 12V power supply and a fan; the output end of the temperature sensor is connected with an MCU (microprogrammed control Unit), the MCU is connected with a G pole of an IGBT (insulated gate bipolar transistor) Q1 through a signal isolator, the 12V power supply is sequentially connected with a diode D1 and a resistor R5 in series to a C pole of the IGBT Q1, an E pole of the IGBT Q1 is grounded, the conduction direction of the diode D1 points to the 12V power supply, the anode of the diode D1 is sequentially connected with the cathode of a diode D1 through an inductor L1 and a fan, one end of the capacitor C2 is connected with a connection point between an inductor L1 and the fan, the other end of the capacitor C2 is connected with the cathode of the diode D1, and the resistor R4 is connected between the G pole of the IGBT Q1 and the ground in a bridging manner.
Furthermore, the signal isolator is an optocoupler U1, the MCU is connected to the ground through the light emitting end of the optocoupler U1, one end of the light receiving end of the optocoupler U1 is connected to a 12V power supply through a resistor R2, and the other end of the optocoupler U1 is connected to the G pole of the IGBT tube Q1.
Furthermore, the other end of the light receiving end of the optocoupler U1 is connected to the G pole of the IGBT tube Q1 through a resistor R3.
Furthermore, the temperature sensor comprises a temperature-sensitive resistor PTC and a resistor R1, a 12V power supply is sequentially connected in series with the temperature-sensitive resistor PTC and the resistor R1 and then connected to the ground, and a joint between the temperature-sensitive resistor PTC and the resistor R1 is connected to the MCU.
Further, the temperature sensor also comprises a capacitor C1, and the capacitor C1 is connected with the resistor R1 in parallel.
Has the advantages that:
in the utility model, as the switch device is an IGBT tube with high withstand voltage and high switching speed, and is matched with the resistor R4 to implement low-level rapid turn-off, the switch control is ensured to be stable; the output end carries out LC filtering through setting up inductance L1, electric capacity C2, effectively gets rid of the high frequency burr, reduces the output ripple, realizes the protection to the fan.
Drawings
The utility model is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the utility model, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.
Fig. 1 is a circuit topology of a temperature-controlled fan for heat dissipation of a power supply according to the present invention.
Detailed Description
The utility model is further described with reference to the following examples.
As shown in fig. 1, the main core device of the temperature-controlled fan for heat dissipation of power supply of the utility model is composed of a temperature sensor, an MCU, a signal isolator, an IGBT Q1, a diode D1, an inductor L1, a capacitor C2, a resistor R4, a resistor R5, a 12V power supply, and a fan, wherein the output end of the temperature sensor is connected with the MCU, the MCU is connected to the G pole of the IGBT Q1 via the signal isolator, the 12V power supply is sequentially connected in series with the diode D1 and the resistor R5 to the C pole of the IGBT Q1, the E pole of the IGBT Q1 is grounded, the diode D1 is turned on in a direction pointing to the 12V power supply, and the anode thereof is sequentially connected to the cathode of the diode D1 via the inductor L1 and the fan, one end of the capacitor C2 is connected to a junction between the inductor L1 and the fan, the other end of the diode D1 is connected to the cathode, and the resistor R4 is bridged between the G pole of the IGBT Q1 and the ground.
During operation, the temperature sensor collects external environment temperature signals and transmits the signals to the MCU, and the MCU outputs PWM control signals which are used for controlling the on and off of the IGBT tube Q1 after signal isolation. Specifically, when a high level is output, the IGBT Q1 is turned on, and a 12V power supply forms a loop through the inductor L1, the fan, the resistor R5, the IGBT Q1 and the ground to drive the fan to operate; when the output low level, IGBT pipe Q1 closes, and the fan loses power. The rotating speed of the fan can be controlled by controlling the duty ratio of the PWM waveform, and stepless speed regulation is realized.
In the utility model, as the switch device is an IGBT tube with high withstand voltage and high switching speed, and is matched with the resistor R4 to implement low-level rapid turn-off, the switch control is ensured to be stable; the output end carries out LC filtering through setting up inductance L1, electric capacity C2, effectively gets rid of the high frequency burr, reduces the output ripple, realizes the protection to the fan.
As an implementation scheme, the signal isolator is implemented by an optocoupler U1, when the circuit is connected, the MCU is connected to the ground through a light emitting end of an optocoupler U1, one end of a light receiving end of an optocoupler U1 is connected to a 12V power supply through a resistor R2 to realize normal-state pull-up, and the other end of the light receiving end of the optocoupler U1 is connected to a G pole of an IGBT tube Q1 to perform IGBT turn-off control. The optical coupler has the characteristics of small volume and strong anti-interference capability, so that the anti-interference capability of the circuit can be further enhanced, and the circuit volume is ensured to be small enough, so that the space occupancy rate of the fan is low.
Preferably, a resistor R3 is connected in series between the other end of the light-receiving end of the optical coupler U1 and the G pole of the GBT tube Q1 for power protection.
As an implementation scheme, the temperature sensor comprises a temperature-sensitive resistor PTC and a resistor R1, a 12V power supply is connected in series with the temperature-sensitive resistor PTC and the resistor R1 in sequence and then connected to the ground, and a joint between the temperature-sensitive resistor PTC and the resistor R1 is connected to the MCU. The temperature sensitive resistor can control the cost and the volume of the circuit and ensure the characteristic of small volume of the circuit. Wherein, a capacitor C1 is connected in parallel at two ends of the resistor R1, and the capacitor C1 is used for filtering, thereby providing the accuracy of front-electrode stable acquisition.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the protection scope of the present application, and although the present application is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application.
Claims (5)
1. The utility model provides a power is control by temperature change fan for heat dissipation which characterized in that:
the device comprises a temperature sensor, an MCU, a signal isolator, an IGBT (insulated gate bipolar transistor) Q1, a diode D1, an inductor L1, a capacitor C2, a resistor R4, a resistor R5, a 12V power supply and a fan;
the output end of the temperature sensor is connected with an MCU (microprogrammed control Unit), the MCU is connected with a G pole of an IGBT (insulated gate bipolar transistor) Q1 through a signal isolator, the 12V power supply is sequentially connected with a diode D1 and a resistor R5 in series to a C pole of the IGBT Q1, an E pole of the IGBT Q1 is grounded, the conduction direction of the diode D1 points to the 12V power supply, the anode of the diode D1 is sequentially connected with the cathode of a diode D1 through an inductor L1 and a fan, one end of the capacitor C2 is connected with a joint between an inductor L1 and the fan, the other end of the capacitor C2 is connected with the cathode of the diode D1, and the resistor R4 is bridged between the G pole of the IGBT Q1 and the ground.
2. The temperature-controlled fan for dissipating heat from power supply of claim 1, wherein the signal isolator is an optocoupler U1, the MCU is connected to ground through a light emitting end of the optocoupler U1, one end of a light receiving end of the optocoupler U1 is connected to a 12V power supply through a resistor R2, and the other end is connected to a G pole of an IGBT tube Q1.
3. The temperature-controlled fan for dissipating heat from power supply of claim 1, wherein the other end of the light receiving end of the optocoupler U1 is connected to the G pole of the IGBT tube Q1 through a resistor R3.
4. The temperature-controlled fan for dissipating heat from power supply of claim 1, wherein the temperature sensor comprises a temperature-sensitive resistor PTC and a resistor R1, the 12V power supply is connected in series with the temperature-sensitive resistor PTC and the resistor R1 in sequence and then connected to the ground, and the junction between the temperature-sensitive resistor PTC and the resistor R1 is connected to the MCU.
5. The temperature controlled fan for dissipating heat from a power supply of claim 1, wherein the temperature sensor further comprises a capacitor C1, and the capacitor C1 is connected in parallel with the resistor R1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120424916.5U CN215805346U (en) | 2021-02-26 | 2021-02-26 | Temperature control fan for power supply heat dissipation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120424916.5U CN215805346U (en) | 2021-02-26 | 2021-02-26 | Temperature control fan for power supply heat dissipation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215805346U true CN215805346U (en) | 2022-02-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120424916.5U Active CN215805346U (en) | 2021-02-26 | 2021-02-26 | Temperature control fan for power supply heat dissipation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215805346U (en) |
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2021
- 2021-02-26 CN CN202120424916.5U patent/CN215805346U/en active Active
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Address after: 510000 one of the self compiled works of No. 20 and No. 22 (plant A1), Lixiang Road, high tech Industrial Park, Conghua Economic Development Zone, Guangzhou, Guangdong Patentee after: HELLY TECHNOLOGY (GUANGZHOU) Co.,Ltd. Address before: 510000 Room 101, building 1, No. 88-2, Zhenhua North Road, Jianggao Town, Baiyun District, Guangzhou City, Guangdong Province (self declaration) Patentee before: HELLY TECHNOLOGY (GUANGZHOU) Co.,Ltd. |