CN214177187U - Fan temperature control circuit based on 555 time base chip and switching power supply thereof - Google Patents
Fan temperature control circuit based on 555 time base chip and switching power supply thereof Download PDFInfo
- Publication number
- CN214177187U CN214177187U CN202120332813.6U CN202120332813U CN214177187U CN 214177187 U CN214177187 U CN 214177187U CN 202120332813 U CN202120332813 U CN 202120332813U CN 214177187 U CN214177187 U CN 214177187U
- Authority
- CN
- China
- Prior art keywords
- fan
- base chip
- sampling resistor
- power supply
- time base
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Cooling Or The Like Of Electrical Apparatus (AREA)
Abstract
The utility model relates to an electronic circuit technical field, concretely relates to fan temperature control circuit based on 555 time base chip and switching power supply thereof, it includes: the device comprises a 555 time base chip, a first sampling resistor, a second sampling resistor, a thermistor and a switching tube; the input voltage is grounded through a first sampling resistor, a second sampling resistor and a thermistor which are sequentially connected in series, and pins 6 of the 555 time-base chip are connected between the first sampling resistor and the second sampling resistor; the pin 2 of the 555 time-base chip is connected between the second sampling resistor and the thermistor; the 3 pins of the 555 time base chip are connected with an external fan through a switch tube; the utility model discloses a fan control by temperature change circuit controls opening and closing of fan according to the temperature to its interval time that makes the fan open and close effectively prolongs, and then has reduced the noise because of the frequent start-up of fan brings.
Description
Technical Field
The utility model relates to an electronic circuit technical field, concretely relates to fan temperature control circuit and a switching power supply who has this fan temperature control circuit based on 555 time base chip.
Background
A switching power supply is a high-frequency power conversion device, and is one of power supplies. The function is to convert a level voltage into a voltage or current required by the user terminal through different types of architectures. In the current market, a fan is often used for heat dissipation in a switching power supply to ensure that electronic devices in the switching power supply work at a safe temperature; in the traditional switching power supply, a fan is controlled to run all the time after being started, but when the output power of the switching power supply is low, the temperature of the whole switching power supply is not high, the fan is not needed to be used for heat dissipation, the fan still runs normally at the moment, the service life of the fan is greatly shortened due to the overlong working time, and the energy consumption is also increased.
In order to solve the above problems, some control schemes combining a thermistor and a control switch tube are available on the market today, so that the fan is started when the temperature in the switching power supply reaches a certain temperature, but in the scheme, the fan is started when the temperature in the switching power supply reaches a set temperature, and then after the temperature in the switching power supply drops, the fan is turned off due to the resistance change of the thermistor, the switching interval time is short, and the fan is started so frequently that the fan generates large noise.
SUMMERY OF THE UTILITY MODEL
In order to overcome the above-mentioned drawbacks, the present invention provides a 555 time base chip-based fan temperature control circuit and a switching power supply thereof, which effectively extend the time interval between the opening and the closing of the fan.
The purpose of the utility model is realized through the following technical scheme:
the utility model relates to a fan control by temperature change circuit based on 555 time base chip, it includes:
the device comprises a 555 time base chip, a first sampling resistor, a second sampling resistor, a thermistor and a switching tube; the input voltage is grounded through a first sampling resistor, a second sampling resistor and a thermistor which are sequentially connected in series, and pins 6 of the 555 time-base chip are connected between the first sampling resistor and the second sampling resistor; the pin 2 of the 555 time-base chip is connected between the second sampling resistor and the thermistor; and the pins 3 of the 555 time base chip are connected with an external fan through a switch tube.
The utility model discloses in, the 7 feet of 555 time base chips connect in between first sampling resistor and the second sampling resistor, 4 feet and 8 feet of 555 time base chips all are connected with the input voltage phase, 1 foot ground connection of 555 time base chips, 5 feet ground connection of 555 time base chips are through ground connection behind the bypass electric capacity.
The utility model discloses in, 555 time base chip's 3 feet with it has the current-limiting resistance to connect between the grid of switch tube, the drain electrode of switch tube is connected with outside fan, the source electrode ground connection of switch tube.
In the present invention, the thermistor is a negative temperature coefficient thermistor.
The utility model discloses in, the resistance of first sampling resistor is 30K omega, the resistance of second sampling resistor is 22K omega.
Based on the same design, the utility model also provides a switching power supply, it includes: the fan temperature control circuit comprises a power supply case, a fan and the fan temperature control circuit; the fan temperature control circuit is arranged in the power supply case, and the fan is connected with a switch tube in the fan temperature control circuit.
The utility model discloses in, the power main part is equipped with in the power machine case, the fan install in the power main part.
The utility model discloses in, be equipped with ventilative window in the power machine case, the fan install in the ventilative window.
The utility model discloses a fan control by temperature change circuit controls opening and closing of fan according to the temperature to its interval time that makes the fan open and close effectively prolongs, and then has reduced the noise because of the frequent start-up of fan brings.
Drawings
For the purpose of illustration, the invention is described in detail with reference to the following preferred embodiments and the accompanying drawings.
Fig. 1 is a schematic circuit structure diagram of the fan temperature control circuit based on a 555 time base chip.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected. Either mechanically or electrically. Either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The following describes a 555 time base chip based fan temperature control circuit according to an embodiment of the present invention, please refer to fig. 1, which includes:
the device comprises a 555 time-base chip NE555, a first sampling resistor R1, a second sampling resistor R2, a thermistor RT1 and a switch tube Q1; an input voltage VDC is grounded GND after passing through a first sampling resistor R1, a second sampling resistor R2 and a thermistor RT1 which are sequentially connected in series, and a pin 6 of the 555 time-base chip NE555 is connected between the first sampling resistor R1 and the second sampling resistor R2; the pin 2 of the 555 time-base chip NE555 is connected between the second sampling resistor R2 and the thermistor RT 1; the pin 3 of the 555 time-base chip NE555 is connected with an external fan B1 through a switch tube Q1, the pin 7 of the 555 time-base chip NE555 is connected between the first sampling resistor R1 and the second sampling resistor R2, the pins 4 and 8 of the 555 time-base chip NE555 are connected with an input voltage VDC, the pin 1 of the 555 time-base chip NE555 is grounded GND, and the pin 5 of the 555 time-base chip NE555 is grounded GND through a bypass capacitor C1. The voltage value of the input voltage VDC is 12V, and the switching tube Q1 is a MOS field effect tube.
Specifically, the control state of the 555 time-based chip is shown as a truth table of the 555 time-based chip, and the truth table of the 555 time-based chip is as follows:
watch 1
| Pin | 2 | 6 | 4 | 3 | 7 | Function(s) |
| Level of electricity | * | * | ＜0.3V | Low level of electricity | Low level of electricity | Forced reduction |
| Level of electricity | ≤1/3Vcc | * | ＞1.4V | High level | Suspended state | Setting |
| Level of electricity | ＞1/3Vcc | ＜2/3Vcc | ＞1.4V | Holding level | Holding | Holding |
| Level of electricity | ＞1/3Vcc | ≥2/3Vcc | ＞1.4V | Low level of electricity | Low level of electricity | Reduction of position |
The specific fan control method in this embodiment is as follows: setting the starting temperature of the fan to be 60 ℃, and setting the closing temperature of the fan to be 50 ℃; when the temperature in the power supply case rises to 60 ℃, the pin 3 of the NE555 time-base chip 555 outputs high level, and the fan B1 is started; when the temperature in the power supply cabinet is reduced to below 60 ℃, the 3-pin keeps high level, and the fan B1 is still in a working state; until the temperature in the power supply cabinet is reduced to about 50 ℃, the 3-pin outputs low level, and the fan B1 is turned off; conversely, when the temperature in the power supply case rises to 50 degrees after the fan B1 is turned off, the low level is maintained, the fan B1 is turned off continuously until the temperature rises to 60 degrees, the high level is output, and the fan B1 is turned on.
In this embodiment, a current-limiting resistor R3 is connected between the pin 3 of the 555 time-base chip NE555 and the gate of the switching tube Q1, the drain of the switching tube Q1 is connected to the external fan B1, the source of the switching tube Q1 is grounded to GND, and a zener diode ZD is connected between the gate and the source of the switching tube Q1.
In this embodiment, the thermistor RT1 is a ntc thermistor, wherein the ntc thermistor has a resistance of 24.5K Ω at 60 degrees and a resistance of about 35.7K Ω at 50 degrees.
In this embodiment, the resistance of the first sampling resistor R1 is 30K Ω, and the resistance of the second sampling resistor R2 is 22K Ω.
The following describes a switching power supply according to an embodiment of the present invention, which includes:
a power supply cabinet, a fan B1, and a fan temperature control circuit as described above; the fan temperature control circuit is arranged in the power supply case, the negative electrode end of the fan B1 is connected with the drain electrode of a switch tube Q1 in the fan temperature control circuit, and the positive electrode end of the fan B1 is connected with an input voltage VDC.
In this embodiment, a power supply main body is arranged in the power supply cabinet, and the fan B1 is mounted on the power supply main body; since the power supply main body is the main heat generating source in the power supply case, the fan B1 is mounted on the power supply main body, which will more efficiently dissipate heat from the power supply main body.
In this embodiment, a ventilation window is provided in the power supply cabinet, and the fan B1 is installed in the ventilation window; since the fan B1 is installed in the ventilation window, it is beneficial to discharge the temperature in the power supply cabinet to the outside of the power supply cabinet and to dissipate the heat of all the electronic devices in the power supply cabinet.
In the description of the present specification, reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "example", "specific example", or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A temperature control circuit of a fan based on a 555 time base chip is characterized by comprising: the device comprises a 555 time base chip, a first sampling resistor, a second sampling resistor, a thermistor and a switching tube; the input voltage is grounded through a first sampling resistor, a second sampling resistor and a thermistor which are sequentially connected in series, and pins 6 of the 555 time-base chip are connected between the first sampling resistor and the second sampling resistor; the pin 2 of the 555 time-base chip is connected between the second sampling resistor and the thermistor; and the pins 3 of the 555 time base chip are connected with an external fan through a switch tube.
2. The 555 time base chip-based fan temperature control circuit according to claim 1, wherein a pin 7 of the 555 time base chip is connected between the first sampling resistor and the second sampling resistor, pins 4 and 8 of the 555 time base chip are connected with an input voltage, a pin 1 of the 555 time base chip is grounded, and a pin 5 of the 555 time base chip is grounded through a bypass capacitor.
3. The 555 time base chip-based fan temperature control circuit according to claim 2, wherein a current limiting resistor is connected between 3 pins of the 555 time base chip and the gate of the switching tube, the drain of the switching tube is connected with an external fan, and the source of the switching tube is grounded.
4. The 555 time base chip based fan temperature control circuit of claim 3, wherein said thermistor is a negative temperature coefficient thermistor.
5. The 555 time base chip based fan temperature control circuit according to claim 4, wherein the resistance value of the first sampling resistor is 30K Ω, and the resistance value of the second sampling resistor is 22K Ω.
6. A switching power supply, comprising: a power supply cabinet, a fan, and the fan temperature control circuit of any one of claims 1 to 5; the fan temperature control circuit is arranged in the power supply case, and the fan is connected with a switch tube in the fan temperature control circuit.
7. The switching power supply according to claim 6, wherein a power supply main body is provided in the power supply case, and the fan is mounted on the power supply main body.
8. The switching power supply according to claim 7, wherein a ventilation window is provided in the power supply case, and the fan is mounted in the ventilation window.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120332813.6U CN214177187U (en) | 2021-02-05 | 2021-02-05 | Fan temperature control circuit based on 555 time base chip and switching power supply thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120332813.6U CN214177187U (en) | 2021-02-05 | 2021-02-05 | Fan temperature control circuit based on 555 time base chip and switching power supply thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214177187U true CN214177187U (en) | 2021-09-10 |
Family
ID=77594603
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120332813.6U Active CN214177187U (en) | 2021-02-05 | 2021-02-05 | Fan temperature control circuit based on 555 time base chip and switching power supply thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214177187U (en) |
-
2021
- 2021-02-05 CN CN202120332813.6U patent/CN214177187U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111987710B (en) | Low-power consumption anti-backflow circuit and multi-input power supply device | |
| CN109256752B (en) | Battery protection circuit and power supply system | |
| CN214177187U (en) | Fan temperature control circuit based on 555 time base chip and switching power supply thereof | |
| CN102566626B (en) | Temperature monitoring circuit | |
| CN107591282B (en) | Control device and method for relay coil | |
| CN103425230A (en) | Power supply control system and method | |
| CN114784783B (en) | Automatic identification selection input power supply system | |
| CN211349131U (en) | Reference voltage temperature control heat dissipation circuit | |
| CN213462773U (en) | Heat dissipation system, heat dissipation circuit, circuit board and electrical box | |
| CN212231073U (en) | Overcurrent protection circuit with alarming and time-delay self-recovery functions | |
| CN210839342U (en) | Voltage reduction circuit and equipment | |
| CN114465473A (en) | Switching power supply circuit with digital surge current suppression function and electronic equipment | |
| CN102324844B (en) | Microcontroller-controlled voltage stabilization device for vehicle body electronic controller | |
| CN208190512U (en) | Switching power supply and cooking equipment | |
| CN207764574U (en) | Be switched on self-locking device and intelligent home control system | |
| CN201639283U (en) | Fan power source control circuit | |
| CN206144834U (en) | Electricity fan control circuit | |
| CN216286205U (en) | Power switch control circuit and electronic equipment | |
| CN205829243U (en) | A kind of power circuit | |
| CN221828803U (en) | High-voltage starting circuit with high precision | |
| CN221353920U (en) | Surge protection circuit, switching power supply circuit and charger | |
| CN113655838B (en) | Voltage-adjustable redundancy control circuit | |
| CN220139235U (en) | Overshoot protection circuit and switching power supply circuit | |
| CN220874424U (en) | Chip power supply circuit, power supply device and electronic equipment | |
| CN202268804U (en) | Voltage stabilizer automatically controlled by microcontroller in electronic body controller |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |