CN213144839U - Fan speed regulation circuit and converter - Google Patents
Fan speed regulation circuit and converter Download PDFInfo
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- CN213144839U CN213144839U CN202021814019.7U CN202021814019U CN213144839U CN 213144839 U CN213144839 U CN 213144839U CN 202021814019 U CN202021814019 U CN 202021814019U CN 213144839 U CN213144839 U CN 213144839U
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Abstract
The embodiment of the utility model discloses fan speed governing circuit and converter relates to power electronic technology field. The method comprises the following steps: the power supply, the voltage regulating circuit and the thermistor are arranged in the heat radiating element of the power device; the voltage regulating circuit comprises a voltage regulating chip, the output end of the power supply is connected to the input end of the voltage regulating chip, the output end of the thermistor is connected to the feedback end of the voltage regulating chip, and the output end of the voltage regulating chip is used for being connected to the fan. The rotating speed of the fan can be automatically adjusted, and the cost is low. The utility model is suitable for an among the power equipment with the device that generates heat.
Description
Technical Field
The utility model relates to a power electronic technology field especially relates to a fan speed governing circuit and converter.
Background
In the field of power electronics, fans are often used to dissipate heat from heat-generating devices. For example, switching devices with a large heat generation amount, such as an IGBT and a MOSFET, are used in devices such as a converter and a high-frequency switching power supply. In order to ensure the normal operation of the equipment, the air cooling and heat dissipation are required. When the running power of the equipment is large, the required air volume is large, and when the running power of the equipment is small, the required air volume can be reduced, so that the energy is saved, and the noise is reduced. Therefore, the speed of the fan is required to be adjusted, so that the air volume can be adjusted according to the load power and the heating value.
At present, the speed of a fan is mainly regulated by two modes, wherein one mode is regulated by voltage in a grading mode; the other is to adopt PWM (pulse width modulation) speed regulation fan to realize speed regulation by controlling duty ratio.
The inventor finds out in the process of realizing the invention: the former needs a single chip microcomputer to control the output voltage in a grading way to realize grading speed regulation; the latter needs the singlechip to output PWM signal to carry out the speed governing, and the cost is higher.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the present invention provides a fan speed regulation circuit board and a converter, which can realize the automatic regulation of the fan speed and have a low cost.
In order to achieve the purpose of the utility model, the following technical proposal is adopted:
in a first aspect, the embodiment of the present invention provides a fan speed regulation circuit, include: the power supply, the voltage regulating circuit and the thermistor are arranged in the heat radiating element of the power device;
the voltage regulating circuit comprises a voltage regulating chip, the output end of the power supply is connected to the input end of the voltage regulating chip, the output end of the thermistor is connected to the feedback end of the voltage regulating chip, and the output end of the voltage regulating chip is used for being connected to the fan.
Optionally, an output end of the voltage regulating chip is connected to a first filter circuit, and an output end of the first filter circuit is used for being connected to the fan.
Optionally, the first filter circuit comprises: the input end of the energy storage inductor is connected to the output end of the voltage regulating chip, one end of the filter capacitor is connected to the output end of the energy storage inductor, and the other end of the filter capacitor is grounded.
Optionally, the energy storage inductance output still is equipped with bleeder circuit, bleeder circuit includes first divider resistor and second divider resistor, the first end of first divider resistor connect in the output of energy storage inductance, the second divider resistor does thermistor, the first end ground connection of thermistor, thermistor with the second end of first divider resistor connect respectively in the feedback end of pressure regulating chip.
Optionally, the second ends of the thermistor and the first voltage dividing resistor are connected to the feedback end of the voltage regulating chip through a current limiting resistor.
Optionally, a diode is connected in a reverse direction to a node between the output end of the voltage regulating chip and the energy storage inductor, and an anode of the diode is grounded.
Optionally, the input of voltage regulation chip includes voltage input end and internal voltage regulation bypass capacitor input end, the output of power is equipped with second filter circuit, second filter circuit's output divide into two the tunnel, all the way with voltage input end connects, another way with internal voltage regulation bypass capacitor input end connects.
Optionally, a third filter circuit is disposed between another branch of the output end of the second filter circuit and the input end of the internal voltage regulation bypass capacitor.
Optionally, the thermistor is a negative temperature coefficient thermistor.
In a second aspect, an embodiment of the present invention provides a converter, including power device and radiator fan, power device is connected with the fin, still includes the first aspect arbitrary fan speed regulation circuit, thermistor connect in on the fin for gather the temperature of fin, fan speed regulation circuit's output with radiator fan electricity is connected.
The embodiment of the utility model provides a fan speed governing circuit and converter, include: the power supply, the voltage regulating circuit and the thermistor are arranged in the heat radiating element of the power device; the voltage regulating circuit comprises a voltage regulating chip, the output end of the power supply is connected to the input end of the voltage regulating chip, the output end of the thermistor is connected to the feedback end of the voltage regulating chip, and the output end of the voltage regulating chip is used for being connected to the fan. The temperature of the power device in the automatic acquisition equipment is converted into a voltage signal and sent to the feedback end of the voltage regulating chip of the voltage regulating circuit through the thermistor arranged in the heat radiating element of the power device in the circuit, the voltage regulating chip of the voltage regulating circuit regulates the voltage according to the fed-back voltage signal and outputs the voltage to the fan to regulate the operating voltage of the fan, so that the purpose of automatically regulating the rotating speed of the fan is achieved, and the cost is low.
Additionally, the embodiment of the utility model provides a converter, because have fan speed governing circuit utilizes the thermistor that sets up in power device's fin, the temperature of automatic acquisition power device, convert the temperature into voltage signal and send to the pressure regulating chip, the voltage signal that the pressure regulating circuit passes through the feedback changes automatically regulated output voltage's size, the rotational speed of automatically regulated fan, and then realize the heat dissipation cooling to the converter, thereby can guarantee the stability of converter work to a certain extent, and do not occupy converter control system interface resource basically, and is with low costs.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a circuit block diagram of an embodiment of the fan speed control circuit of the present invention;
FIG. 2 is a schematic circuit diagram of an embodiment of the fan speed control circuit of the present invention;
FIG. 3 is a circuit block diagram of an embodiment of the current transformer of the present invention
In the figure, C1-C5 are capacitors, R1-R2 are resistors, NTC is a negative temperature coefficient thermistor, D1 is a diode, L1 is an inductor, U1 is a voltage regulating chip, +24V is a power supply, GND is a power ground, and Vout is the output of the whole circuit.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
It should be apparent that numerous technical details are set forth in the following detailed description to provide a more thorough description of the present invention, and it will be apparent to those skilled in the art that the present invention may be practiced without some of these details. In addition, some methods, means, components and applications thereof known to those skilled in the art are not described in detail in order to highlight the gist of the present invention, but the implementation of the present invention is not affected thereby. The embodiments described herein are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
The embodiment of the utility model provides a fan speed governing circuit is applicable to the power equipment that has the device that generates heat, for example in equipment such as converter, high frequency switching power supply. The rotating speed of the fan for cooling or heat dissipation can be automatically adjusted according to the heat productivity of the load, the heat dissipation is performed according to the operating power of the self-adaptive load, the energy is saved, the cost is low, the heat dissipation problem of the power equipment is solved, and the normal operation of the equipment can be guaranteed to a certain extent.
Referring to fig. 1 and fig. 2, an embodiment of the present invention provides a fan speed regulation circuit, including: the power supply, the voltage regulating circuit and the thermistor NTC arranged in the heat radiating element of the power device;
the voltage regulating circuit comprises a voltage regulating chip U1, the output end of the power supply is connected to the input end of the voltage regulating chip U1, and the output of the thermistor NTC is connected to the feedback end 2 of the voltage regulating chip U1; the output end 3 of the voltage regulating chip U1 is used for being connected to a fan.
The characters ' first and ' second ' in fig. 1 and 3 represent wiring terminals, and the input end of the voltage regulating chip comprises a voltage input end pin 5 and an internal voltage regulating bypass capacitor input end pin 4.
The thermistor NTC is used for collecting the temperature of the radiating fin of the power device. In particular, the thermistor NTC is a negative temperature coefficient thermistor, commonly referred to as an NTC thermistor, which is a type of sensor resistor whose resistance value decreases as the temperature increases. When the voltage regulating circuit works, the resistance value of the NTC thermistor reversely changes along with the temperature change of the radiating fin, and the value of the voltage feedback end 2 of the voltage regulating chip U1 changes along with the resistance value change of the NTC thermistor. When the temperature of the radiating fin rises, the resistance value of the NTC thermistor is reduced, the voltage correspondingly fed back to the feedback end 2 of the voltage regulating chip U1 of the voltage regulating circuit is reduced, and the voltage Vout output to the fan by the voltage regulating circuit based on the feedback signal is increased, so that the rotating speed of the fan is increased, the heat radiation is accelerated, and the temperature of a power device is reduced.
In the whole circuit, Vout ═ 1.25 ═ 1+ R2/NTC. When the resistance value of the NTC is larger, Vout is smaller, and when the NTC is smaller, Vout is larger, and the fan rotating speed is correspondingly faster.
When the temperature of the radiating fin is lower, the resistance value of the NTC thermistor is increased, the voltage correspondingly fed back to the feedback end 2 of the voltage regulating chip U1 of the voltage regulating circuit is increased, the voltage output to the fan by the voltage regulating circuit is reduced based on the feedback signal, the rotating speed of the fan is reduced, the purpose of saving energy is achieved, the rotating speed of the fan can be automatically regulated according to the current heat productivity of the power device, and the power device can work at a constant temperature.
The embodiment of the utility model provides a fan speed governing circuit and converter, include: the power supply, the voltage regulating circuit and the thermistor NTC arranged in the heat radiating element of the power device; the voltage regulating circuit comprises a voltage regulating chip U1, the output end of the power supply is connected to the input end of the voltage regulating chip U1, the output end of the thermistor NTC is connected to the feedback end 2 of the voltage regulating chip U1, and the output end of the voltage regulating chip U1 is connected to the fan. Through thermistor NTC that sets up in power device radiating element in the circuit, the temperature of the power device in the automatic acquisition equipment to convert voltage signal transmission to the feedback end 2 of voltage regulating chip U1 of regulator circuit, the voltage regulating chip U1 of regulator circuit adjusts voltage and exports to the fan according to the voltage signal regulation voltage of feedback, comes the operating voltage of adjusting the fan, thereby reaches the purpose of automatically regulated fan rotational speed, and the cost is lower.
Referring to fig. 2, in some embodiments, the voltage of the power supply is 24V, and the voltage regulating circuit is a BUCK conversion circuit, commonly referred to as a BUCK circuit.
And the output end 3 of the voltage regulating chip U1 is connected with a first filter circuit, and the output end of the first filter circuit is used for being connected to the fan. Through setting up first filter circuit, can export smooth and stable voltage to the fan, realize the stepless steady variable speed of fan.
Specifically, the first filter circuit includes: energy storage inductance L1 and filter capacitor, energy storage inductance L1's input connect in the output 3 of voltage regulation chip U1, filter capacitor is parallelly connected to form by electric capacity C4 and electric capacity C5, filter capacitor one end connect in on energy storage inductance L1's the output, other end ground connection GND.
Continuing to refer to fig. 2, the output end of the energy storage inductor L1 is further provided with a voltage divider circuit, the voltage divider circuit includes a first voltage divider resistor R2 and a second voltage divider resistor, the first end of the first voltage divider resistor R2 is connected to the output end of the energy storage inductor L1, the second voltage divider resistor is the thermistor NTC, the first end of the thermistor NTC is grounded GND, and the second ends of the thermistor NTC and the first voltage divider resistor R2 are respectively connected to the feedback end 2 of the voltage regulator chip U1.
In order to protect the voltage feedback terminal 2 pin of the voltage regulating chip U1, the second terminals of the thermistor NTC and the first voltage dividing resistor R2 are connected to the feedback terminal 2 of the voltage regulating chip U1 through a current limiting resistor. Therefore, the current of the feedback end 2 of the voltage regulating chip U1 can be limited by the current limiting resistor, so that the feedback end 2 of the voltage regulating chip U1 is prevented from being burnt out by overlarge current, and the protection of the voltage regulating chip U1 is realized.
In order to further protect the voltage regulating chip U1, as shown in fig. 2, in some embodiments, a diode D1 is connected in reverse direction to a node between the output terminal 3 of the voltage regulating chip U1 and the energy storage inductor L1, and an anode of the diode is grounded to GND. The diode D1 is a freewheeling diode D1(Flyback diode) in this embodiment, and can make the current flowing through the voltage regulating chip U1 change more gradually, so as to avoid the occurrence of surge voltage, thereby protecting the voltage regulating chip U1 from being broken down by sudden induced voltage during operation.
With reference to fig. 2, the input terminal of the voltage regulating chip U1 includes a voltage input terminal 5 and an internal voltage regulating bypass capacitor input terminal 4, the output terminal of the power supply is provided with a second filter circuit, the output terminal of the second filter circuit is divided into two paths, one path is connected to the voltage input terminal, and the other path is connected to the internal voltage regulating bypass capacitor input terminal.
The second filter circuit is specifically a filter support circuit, and comprises an energy storage capacitor C1 and a filter capacitor C2 which are connected in parallel to the power output end, and the circuit formed by the two has the effects of energy storage and filtering, and is also called a direct current link (DC-link) support capacitor.
By arranging the second filter circuit at the power output end, smooth and stable voltage can be output to supply power to the voltage regulating chip U1.
Specifically, a third filter circuit for filtering is arranged between the other branch of the output end of the second filter circuit and the input end of the internal voltage regulation bypass capacitor. In some embodiments, the third filtering circuit includes a capacitor C3 for filtering.
Example two
Referring to fig. 3, a further embodiment of the present invention provides a converter, including a power device and a heat dissipation fan, wherein the power device is connected to a heat sink, and further includes a fan speed regulation circuit according to the first aspect, the thermistor NTC is connected to the heat sink for collecting the temperature of the heat sink, and the output end of the fan speed regulation circuit is electrically connected to the heat dissipation fan.
The embodiment of the utility model provides a converter, because have fan speed governing circuit utilizes the thermistor NTC that sets up in power device's fin, the temperature of automatic acquisition power device, convert the temperature into voltage signal and send to pressure regulating chip U1, the voltage signal that the pressure regulating circuit passes through the feedback changes automatically regulated output voltage's size, the rotational speed of automatically regulated fan, and then realize the heat dissipation cooling to the converter, thereby can guarantee the stability of converter work to a certain extent, and do not occupy converter control system interface resource basically, and is with low costs.
The fan speed regulating circuit and the converter provided by the embodiment do not need the intervention of a single control system such as a single chip microcomputer, do not occupy the interface resource of the converter control system, and can automatically regulate the rotating speed of the fan by arranging the thermistor NTC in the radiating fin, collecting the temperature of the radiating fin by adopting the thermistor NTC and transmitting the temperature to the voltage regulating circuit, so that the cost is low.
It should be noted that, in this document, the various embodiments are based on the same or corresponding technical concept, and although different, the implementation and technical effects thereof are substantially the same, and may be referred to each other.
The terms "upper", "lower", and the like, indicate orientations or positional relationships and are used for convenience in describing the present invention and for simplicity in description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; may be directly connected or indirectly connected through an intermediate. Relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. As will be appreciated by one of ordinary skill in the art, the situation may be specified.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A fan speed regulation circuit, comprising: the power supply, the voltage regulating circuit and the thermistor are arranged in the heat radiating element of the power device;
the voltage regulating circuit comprises a voltage regulating chip, the output end of the power supply is connected to the input end of the voltage regulating chip, the output end of the thermistor is connected to the feedback end of the voltage regulating chip, and the output end of the voltage regulating chip is used for being connected to the fan.
2. The fan speed regulation circuit of claim 1, wherein the output end of the voltage regulation chip is connected with a first filter circuit, and the output end of the first filter circuit is used for being connected to the fan.
3. The fan speed control circuit of claim 2, wherein the first filter circuit comprises: the input end of the energy storage inductor is connected to the output end of the voltage regulating chip, one end of the filter capacitor is connected to the output end of the energy storage inductor, and the other end of the filter capacitor is grounded.
4. The fan speed regulation circuit of claim 3, wherein the energy storage inductor output end is further provided with a voltage divider circuit, the voltage divider circuit comprises a first voltage divider resistor and a second voltage divider resistor, a first end of the first voltage divider resistor is connected to the energy storage inductor output end, the second voltage divider resistor is the thermistor, a first end of the thermistor is grounded, and a second end of the thermistor and a second end of the first voltage divider resistor are respectively connected to the feedback end of the voltage regulator chip.
5. The fan speed regulation circuit of claim 4, wherein the second ends of the thermistor and the first voltage-dividing resistor are connected to the feedback end of the voltage-regulating chip through a current-limiting resistor.
6. The fan speed regulation circuit of claim 3, wherein a diode is connected in a reverse direction to a node between the output end of the voltage regulation chip and the energy storage inductor, and an anode of the diode is grounded.
7. The fan speed regulation circuit of claim 1, wherein the input terminal of the voltage regulation chip comprises a voltage input terminal and an internal voltage regulation bypass capacitor input terminal, the output terminal of the power supply is provided with a second filter circuit, the output terminal of the second filter circuit is divided into two paths, one path is connected with the voltage input terminal, and the other path is connected with the internal voltage regulation bypass capacitor input terminal.
8. The fan speed regulation circuit of claim 7, wherein a third filter circuit is provided between the other branch of the output terminal of the second filter circuit and the input terminal of the internal voltage regulation bypass capacitor.
9. The fan speed control circuit of claim 1, wherein the thermistor is a negative temperature coefficient thermistor.
10. A converter comprises a power device and a heat radiation fan, wherein the power device is connected with a heat radiation fin, and the converter is characterized by further comprising a fan speed regulation circuit as claimed in any one of claims 1 to 8, wherein a thermistor is connected to the heat radiation fin and used for collecting the temperature of the heat radiation fin, and the output end of the fan speed regulation circuit is electrically connected with the heat radiation fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021814019.7U CN213144839U (en) | 2020-08-26 | 2020-08-26 | Fan speed regulation circuit and converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021814019.7U CN213144839U (en) | 2020-08-26 | 2020-08-26 | Fan speed regulation circuit and converter |
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| Publication Number | Publication Date |
|---|---|
| CN213144839U true CN213144839U (en) | 2021-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021814019.7U Active CN213144839U (en) | 2020-08-26 | 2020-08-26 | Fan speed regulation circuit and converter |
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|---|---|
| CN (1) | CN213144839U (en) |
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- 2020-08-26 CN CN202021814019.7U patent/CN213144839U/en active Active
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