CN214427828U - Temperature control circuit - Google Patents
Temperature control circuit Download PDFInfo
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- CN214427828U CN214427828U CN202120351337.2U CN202120351337U CN214427828U CN 214427828 U CN214427828 U CN 214427828U CN 202120351337 U CN202120351337 U CN 202120351337U CN 214427828 U CN214427828 U CN 214427828U
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- transformer
- control circuit
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- temperature control
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Abstract
The utility model belongs to the technical field of the POE power supply technique and specifically relates to indicate a temperature control circuit, including transformer T12, the POE module, fan control port, three terminal regulator Q11, resistance R175 and resistance R174, transformer T12's input is connected with external power source, transformer T12's output main winding is connected with the POE module, transformer T12's output secondary winding is connected with fan control port, three terminal regulator Q11's negative pole and resistance R175's one end are connected with transformer T12's output main winding, three terminal regulator Q11's positive pole and resistance R174's one end ground connection, resistance R175's the other end and resistance R174's the other end and three terminal regulator Q11's voltage reference end are connected. The utility model discloses make the rotational speed of the fan of being connected with fan control port change along with the change of the load of being connected with POE module.
Description
Technical Field
The utility model belongs to the technical field of the POE power supply technique and specifically relates to indicate a temperature control circuit.
Background
The POE switch usually uses a fan to dissipate heat, and in order to save energy, the fan needs to rotate faster when the POE switch is loaded high and rotate slower when the switch is loaded low. In order to implement this function, a complex control circuit needs to be added to the POE switch, which results in higher manufacturing cost of the control circuit in the POE switch.
Disclosure of Invention
The utility model discloses problem to prior art provides a simple structure, low in manufacturing cost's temperature control circuit.
The utility model adopts the following technical scheme: the utility model provides a temperature control circuit, includes transformer T12, POE module, fan control port, three terminal regulator Q11, resistance R175 and resistance R174, transformer T12's input and external power source are connected, transformer T12's output main winding is connected with the POE module, transformer T12's output secondary winding is connected with fan control port, three terminal regulator Q11's negative pole and resistance R175's one end are connected with transformer T12's output main winding, and three terminal regulator Q11's positive pole and resistance R174's one end ground connection, resistance R175's the other end and resistance R174's the other end and three terminal regulator Q11's voltage reference end are connected.
Preferably, the temperature control circuit further comprises a diode D35, the anode of the diode D35 is connected with the cathode of the three-terminal regulator Q11, and the cathode of the diode D35 is connected with the output main winding of the transformer T12.
Preferably, the temperature control circuit further includes an inductor L18, and the output main winding of the transformer T12 is connected to the POE module through the inductor L18.
Preferably, the temperature control circuit further comprises an inductor L20, and the output secondary winding of the transformer T12 is connected to the fan control port through the inductor L20.
Preferably, the temperature control circuit further comprises a diode D36, the output secondary winding of the transformer T12 is connected to the anode of the diode D36, and the cathode of the diode D36 is connected to the fan control port through an inductor L20.
Preferably, the temperature control circuit further comprises a diode D37 and a diode D38, an anode of the diode D37 is connected to the output secondary winding of the transformer T12, a cathode of the diode D37 is connected to an anode of the diode D38, and a cathode of the diode D38 is connected to the fan control port.
Preferably, the temperature control circuit further comprises a rectifier bridge BD1, an input end of the rectifier bridge BD1 is connected with an external power supply, and an output end of the rectifier bridge BD1 is connected with an input end of the transformer T12.
The utility model has the advantages that: by using the primary output winding of the transformer T12 to power the POE module and the secondary output winding to power the fan control port, while using the three-terminal regulator to sample and stabilize the primary output winding of the transformer T12, the speed of the fan connected to the fan control port is made to vary with the load connected to the POE module.
Drawings
Fig. 1 is a partial circuit diagram of the present invention.
Fig. 2 is another partial circuit diagram of the present invention.
The reference signs are: 1. a POE module; 2. a fan control port.
Detailed Description
In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention. The present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1 and fig. 2, a temperature control circuit includes a transformer T12, a POE module 1, a fan control port 2, a three-terminal regulator Q11, a resistor R175, and a resistor R174, an input terminal of the transformer T12 is connected to an external power supply, an output main winding of the transformer T12 is connected to the POE module 1, an output secondary winding of the transformer T12 is connected to the fan control port 2, a cathode of the three-terminal regulator Q11 and one end of the resistor R175 are connected to an output main winding of the transformer T12, an anode of the three-terminal regulator Q11 and one end of the resistor R174 are grounded, and the other end of the resistor R175 and the other end of the resistor R174 are connected to a voltage reference terminal of the three-terminal regulator Q11.
Since the turn ratio of the output main winding of the transformer T12 and the output secondary winding of the transformer T12 is constant, and thus the voltage ratio of the output main winding of the transformer T12 and the output secondary winding of the transformer T12 is also constant, sampling and voltage stabilization of the output main winding of the transformer T12 by the three-terminal regulator Q11 makes it possible to change the voltage of the output secondary winding of the transformer T12 in accordance with a change in the load of the output main winding of the transformer T12, and to increase the rotation speed of the fan connected to the fan control port 2 due to a voltage increase or decrease the rotation speed due to a voltage decrease. Three terminal regulator Q11 is model CJ 431.
As shown in fig. 2, the temperature control circuit further includes a diode D35, an anode of the diode D35 is connected to a cathode of the three-terminal regulator Q11, and a cathode of the diode D35 is connected to an output main winding of the transformer T12. Thereby preventing the current from flowing backwards to damage the three-terminal regulator Q11.
As shown in fig. 2, the temperature control circuit further includes an inductor L18, and the output main winding of the transformer T12 is connected to the POE module 1 through the inductor L18, so as to implement filtering and make the voltage input to the POE module 1 more stable.
As shown in fig. 2, the temperature control circuit further includes an inductor L20, and the output secondary winding of the transformer T12 is connected to the fan control port 2 through an inductor L20, so as to implement filtering and make the voltage input to the fan control port 2 more stable.
As shown in fig. 2, the temperature control circuit further includes a diode D36, the output secondary winding of the transformer T12 is connected to the anode of the diode D36, and the cathode of the diode D36 is connected to the fan control port 2 through an inductor L20, so as to prevent the transformer T12 from being damaged due to backward current flow.
As shown in fig. 2, the temperature control circuit further includes a diode D37 and a diode D38, an anode of the diode D37 is connected to the output secondary winding of the transformer T12, a cathode of the diode D37 is connected to an anode of the diode D38, and a cathode of the diode D38 is connected to the fan control port 2, and a voltage drop is formed by the diode D37 and the diode D38 so as to adapt to a voltage required by the fan.
As shown in fig. 1, the temperature control circuit further includes a rectifier bridge BD1, an input terminal of the rectifier bridge BD1 is connected to an external power source, and an output terminal of the rectifier bridge BD1 is connected to an input terminal of the transformer T12, so as to convert an external ac power into a dc power.
The above description is only for the preferred embodiment of the present invention, and the present invention is not limited to the above description, and although the present invention is disclosed in the preferred embodiment, it is not limited to the above description, and any person skilled in the art can make some changes or modifications to equivalent embodiments without departing from the scope of the present invention, but all the technical solutions of the present invention are within the scope of the present invention.
Claims (7)
1. A temperature control circuit is characterized in that: including transformer T12, POE module, fan control port, three terminal regulator Q11, resistance R175 and resistance R174, transformer T12's input is connected with external power source, transformer T12's output main winding is connected with the POE module, transformer T12's output secondary winding is connected with fan control port, three terminal regulator Q11's negative pole and resistance R175's one end are connected with transformer T12's output main winding, and three terminal regulator Q11's positive pole and resistance R174's one end ground connection, and resistance R175's the other end and resistance R174's the other end are connected with three terminal regulator Q11's voltage reference end.
2. The temperature control circuit of claim 1, wherein: the temperature control circuit further comprises a diode D35, the anode of the diode D35 is connected with the cathode of the three-terminal regulator Q11, and the cathode of the diode D35 is connected with the output main winding of the transformer T12.
3. The temperature control circuit of claim 1, wherein: the temperature control circuit further comprises an inductor L18, and the output main winding of the transformer T12 is connected with the POE module through an inductor L18.
4. The temperature control circuit of claim 1, wherein: the temperature control circuit further comprises an inductor L20, and the output secondary winding of the transformer T12 is connected with the fan control port through an inductor L20.
5. The temperature control circuit of claim 4, wherein: the temperature control circuit further comprises a diode D36, the output secondary winding of the transformer T12 is connected with the anode of the diode D36, and the cathode of the diode D36 is connected with the fan control port through an inductor L20.
6. The temperature control circuit of claim 1, wherein: the temperature control circuit further comprises a diode D37 and a diode D38, the anode of the diode D37 is connected with the output secondary winding of the transformer T12, the cathode of the diode D37 is connected with the anode of the diode D38, and the cathode of the diode D38 is connected with the fan control port.
7. The temperature control circuit of claim 1, wherein: the temperature control circuit further comprises a rectifier bridge BD1, the input end of the rectifier bridge BD1 is connected with an external power supply, and the output end of the rectifier bridge BD1 is connected with the input end of the transformer T12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120351337.2U CN214427828U (en) | 2021-02-07 | 2021-02-07 | Temperature control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120351337.2U CN214427828U (en) | 2021-02-07 | 2021-02-07 | Temperature control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214427828U true CN214427828U (en) | 2021-10-19 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120351337.2U Active CN214427828U (en) | 2021-02-07 | 2021-02-07 | Temperature control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214427828U (en) |
-
2021
- 2021-02-07 CN CN202120351337.2U patent/CN214427828U/en active Active
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