CN214377988U - Switching power supply transformer with good heat dissipation effect - Google Patents
Switching power supply transformer with good heat dissipation effect Download PDFInfo
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- CN214377988U CN214377988U CN202120424908.0U CN202120424908U CN214377988U CN 214377988 U CN214377988 U CN 214377988U CN 202120424908 U CN202120424908 U CN 202120424908U CN 214377988 U CN214377988 U CN 214377988U
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- switching power
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Abstract
The utility model relates to a switching power supply transformer with low power consumption and good heat dissipation effect, which comprises a transformer T1, a rectifier bridge VD, a filter, a voltage stabilizing diode D1, a relay K1, a fan, a temperature sensitive resistor, a resistor R1 and a back-drain comparator U2A; the transformer T1 takes electricity from the outside, and the output voltage of the transformer T1 is filtered by a filter and stabilized by a voltage stabilizing diode D1 to be used as the output voltage for supplying power to the outside; the output voltage is sequentially connected with a normally open contact of a relay K1 in series, and a fan, and then is connected to the ground, wherein the blowing direction of the fan is aligned with the transformer T1; the output voltage is connected to the ground through a temperature-sensitive resistor and a resistor R1 in sequence, a junction between the temperature-sensitive resistor and the resistor R1 is connected to the reverse input end of a leakage comparator U2A, the forward input end of the leakage comparator U2A is connected with reference voltage, the output end of the leakage comparator U2A is connected with a coil of a relay K1 in series and then connected to the ground, and the temperature-sensitive resistor is attached to the surface of a transformer T1 to collect temperature.
Description
Technical Field
The utility model relates to a power electronic application technical field especially relates to a switching power supply transformer that radiating effect is good.
Background
The current switching power supply for computers is mainly used for converting commercial power into 12V, 5V and 3.3V direct current output, wherein 12V is obtained after direct transformation, rectification, filtering and voltage stabilization, and 5V and 3.3V are converted and output from 12V through a three-terminal voltage stabilization chip. Because the power conversion needs to be continued, a transformer in the switching power supply generally generates heat greatly, but the common switching power supply is basically only provided with an independent fan to dissipate heat of the whole power supply, the transformer is not independently dissipated, and the fan always works for power-on starting, so that the power consumption is high, and the phenomenon of electricity waste exists.
SUMMERY OF THE UTILITY MODEL
The utility model provides a switching power supply transformer with low power consumption and good heat dissipation effect, which solves the disadvantages in the prior art.
The switching power supply transformer with good heat dissipation effect comprises a transformer T1, a rectifier bridge VD, a filter, a voltage stabilizing diode D1, a relay K1, a fan, a temperature sensitive resistor, a resistor R1 and a leakage-back comparator U2A; the transformer T1 takes electricity from the outside, and the output voltage of the transformer T1 is filtered by a filter and stabilized by a voltage stabilizing diode D1 to be used as the output voltage for supplying power to the outside; the output voltage is sequentially connected with a normally open contact of a relay K1 in series, and a fan, and then is connected to the ground, wherein the blowing direction of the fan is aligned with the transformer T1; the output voltage is connected to the ground through a temperature-sensitive resistor and a resistor R1 in sequence, a junction between the temperature-sensitive resistor and the resistor R1 is connected to the reverse input end of a leakage comparator U2A, the forward input end of the leakage comparator U2A is connected with reference voltage, the output end of the leakage comparator U2A is connected with a coil of a relay K1 in series and then connected to the ground, and the temperature-sensitive resistor is attached to the surface of a transformer T1 to collect temperature.
Further, the filter is a pi-type LC filter.
Further, the direct current drive circuit further comprises a one-way flow-guiding diode D2 and a one-way flow-guiding diode D3, wherein the output voltage is connected to a normally open contact of the relay K1 through the one-way flow-guiding diode D2 and is connected to the temperature-sensitive resistor through the one-way flow-guiding diode D3, the conduction direction of the one-way flow-guiding diode D2 points to the normally open contact, and the conduction direction of the one-way flow-guiding diode D3 points to the temperature-sensitive resistor.
Further, the temperature-sensitive resistor is an NTC temperature-sensitive resistor.
Further, the NTC temperature-sensitive resistors are provided in a plurality and connected in parallel, and are uniformly distributed on each surface of the transformer T1.
Furthermore, the circuit also comprises a follower U1A, and a joint between the temperature-sensitive resistor and the resistor R1 is connected to the reverse input end of the leakage comparator U2A through the follower U1A.
Further, an LED lamp and a resistor R6 are included, and the output terminal of the back-drain comparator U2A is also connected to ground through the LED lamp and the resistor R6.
Further, the resistor R1 is an adjustable potentiometer.
Has the advantages that:
the utility model discloses a temperature sensitive resistor and comparator realize that the fan only starts the heat dissipation at the feedback formula that the transformer temperature exceeds standard, and the transformer radiating effect is good, and the power consumption is low, through setting up the comparator into letting back the comparator, avoids the drift of temperature zero point to lead to the fan to frequently open and close, guarantees that the circuit is stable and fan life-span, because the circuit is whole to be realized by pure mould electricity, response speed is fast, and work is durable, but uses in batches.
Drawings
The present invention is further explained by using the drawings, but the embodiments in the drawings do not constitute any limitation to the present invention, and for those skilled in the art, other drawings can be obtained according to the following drawings without any inventive work.
Fig. 1 is a circuit topology of the switching power supply transformer of the present invention.
Detailed Description
The invention will be further described with reference to the following examples.
As shown in fig. 1, the switching power supply transformer of the present invention includes a transformer T1, a rectifier bridge VD, a filter, a zener diode D1, a relay K1, a fan, a temperature sensitive resistor, a resistor R1, and a leakage comparator U2A; the transformer T1 gets electricity from the outside, and the output voltage of the transformer T1 is filtered by a filter and stabilized by a voltage stabilizing diode D1 to be used as the output voltage for supplying power to the outside; the output voltage is sequentially connected with a normally open contact of the relay K1 and the fan in series and then is connected to the ground, and the blowing direction of the fan is aligned with the transformer T1; the output voltage is further connected to the ground through a temperature-sensitive resistor and a resistor R1 in sequence, a junction between the temperature-sensitive resistor and the resistor R1 is connected to the reverse input end of a leakage comparator U2A, the forward input end of the leakage comparator U2A is connected with reference voltage, the output end of the leakage comparator U2A is connected with a coil of a relay K1 in series and then connected to the ground, and the temperature-sensitive resistor is attached to the surface of a transformer T1 to collect temperature.
When the transformer T1 works, 220AV single-phase power is taken from the mains supply, and after voltage transformation output, the transformer T1 carries out rectification, filtering and voltage stabilization through the rectifier bridge VD, the filter and the voltage stabilizing diode D1 and then outputs 12DV direct-current output voltage for supplying power to external computer devices. In the working process, the temperature-sensitive resistor is attached to the surface of the transformer T1 to collect the voltage of the transformer in real time, before the temperature of the transformer does not rise to exceed a threshold value (a temperature value corresponding to a reference voltage), the temperature-sensitive resistor is discharged back to the comparator U2A to output low voltage, the relay coil is in power failure, a normally open contact of the relay coil is kept in a normal state, namely a disconnected state, a motor of the fan is not started when power is lost, and the generation of power consumption during dormancy is ensured; when the temperature of the transformer rises, because the temperature-sensitive resistor is NTC, the potential of a joint between the temperature-sensitive resistor and the resistor R1 is reduced, when the temperature exceeds a threshold value, the potential of the joint is just reduced to be lower than a reference voltage REF, the output of the comparator U2A is discharged for jumping, a relay coil is electrified to close a normally open contact, 12DV direct-current output voltage is transmitted to a fan motor to drive a fan to operate, the temperature of the transformer T1 is reduced, and core heat dissipation of the transformer T1 is realized.
The utility model discloses a temperature sensitive resistor and comparator realize that the fan only starts the heat dissipation at the feedback formula that the transformer temperature exceeds standard, and the transformer radiating effect is good, and the power consumption is low, through setting up the comparator into letting back the comparator, avoids the drift of temperature zero point to lead to the fan to frequently open and close, guarantees that the circuit is stable and fan life-span, because the circuit is whole to be realized by pure mould electricity, response speed is fast, and work is durable, but uses in batches.
Furthermore, the filter in the circuit is selected as a pi-type LC filter, so that the filtering effect is enhanced, the insertion loss is reduced, and the output of the circuit is low in impedance.
In order to avoid the influence of current output backflow on the output quality, the circuit is further provided with a one-way flow guide diode D2 and a one-way flow guide diode D3, the output voltage is connected to a normally open contact of the relay K1 through the one-way flow guide diode D2 and is connected to the temperature-sensitive resistor through the one-way flow guide diode D3, the conduction direction of the one-way flow guide diode D2 points to the normally open contact, and the conduction direction of the one-way flow guide diode D3 points to the temperature-sensitive resistor.
The utility model discloses in, NTC temperature sensitive resistance has 4, and 4 NTC temperature sensitive resistances are parallelly connected each other on circuit structure, distribute in 4 sides of transformer T1 on arranging the position separately, carry out synchronous temperature collection to 4 faces of transformer, ensure that the temperature collection is balanced comprehensive. Since the resistors are NTCs and are connected in parallel, when the temperature of any one side of the transformer T1 rises, the resistance corresponding to the NTCs decreases, which causes the overall resistance after 4 parallel connections to decrease, and further, the contact voltage is reduced, thereby realizing heat dissipation control.
Further, an LED lamp for light warning is further arranged, the output end of the leak-back comparator U2A is connected to the ground through the LED lamp and a resistor R6, when the leak-back comparator U2A outputs a high level, the LED lamp is in an electric warning state, and the resistor R6 is used for power protection. In addition, the resistor R1 is also set to be an adjustable potentiometer, and the adjustment of the feedback response speed can be realized by adjusting the resistance value of the resistor R1.
Preferably, a follower U1A is further provided, and a junction between the temperature-sensitive resistor and the resistor R1 is connected to the reverse input end of the comparator U2A through the follower U1A for signal isolation transmission.
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 (8)
1. The utility model provides a switching power supply transformer that radiating effect is good which characterized in that:
the device comprises a transformer T1, a rectifier bridge VD, a filter, a voltage stabilizing diode D1, a relay K1, a fan, a temperature-sensitive resistor, a resistor R1 and a leakage-back comparator U2A;
the transformer T1 takes electricity from the outside, and the output voltage of the transformer T1 is filtered by a filter and stabilized by a voltage stabilizing diode D1 to be used as the output voltage for supplying power to the outside;
the output voltage is sequentially connected with a normally open contact of a relay K1 in series, and a fan, and then is connected to the ground, wherein the blowing direction of the fan is aligned with the transformer T1;
the output voltage is connected to the ground through a temperature-sensitive resistor and a resistor R1 in sequence, a junction between the temperature-sensitive resistor and the resistor R1 is connected to the reverse input end of a leakage comparator U2A, the forward input end of the leakage comparator U2A is connected with reference voltage, the output end of the leakage comparator U2A is connected with a coil of a relay K1 in series and then connected to the ground, and the temperature-sensitive resistor is attached to the surface of a transformer T1 to collect temperature.
2. The switching power supply transformer with good heat dissipation effect as recited in claim 1, wherein the filter is a pi-type LC filter.
3. The switching power supply transformer with good heat dissipation effect as claimed in claim 2, further comprising a unidirectional flow-guiding diode D2 and a unidirectional flow-guiding diode D3, wherein the output voltage is connected to a normally open contact of the relay K1 through the unidirectional flow-guiding diode D2 and is connected to the temperature-sensitive resistor through the unidirectional flow-guiding diode D3, a conduction direction of the unidirectional flow-guiding diode D2 points to the normally open contact, and a conduction direction of the unidirectional flow-guiding diode D3 points to the temperature-sensitive resistor.
4. The transformer for switching power supply of claim 1, wherein the temperature-sensitive resistor is an NTC temperature-sensitive resistor.
5. The switching power transformer of claim 4, wherein the NTC temperature-sensitive resistors are connected in parallel and are uniformly distributed on the surface of the transformer T1.
6. The switching power transformer with good heat dissipation effect as claimed in claim 5, further comprising a follower U1A, wherein a junction between the temperature sensitive resistor and the resistor R1 is connected to the inverting input terminal of the comparator U2A via the follower U1A.
7. The switching power transformer with good heat dissipation effect of claim 1, further comprising an LED lamp and a resistor R6, wherein the output terminal of the back-drain comparator U2A is further connected to ground through the LED lamp and the resistor R6.
8. The switching power supply transformer with good heat dissipation effect as recited in claim 1, wherein said resistor R1 is an adjustable potentiometer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120424908.0U CN214377988U (en) | 2021-02-26 | 2021-02-26 | Switching power supply transformer with good heat dissipation effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120424908.0U CN214377988U (en) | 2021-02-26 | 2021-02-26 | Switching power supply transformer with good heat dissipation effect |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214377988U true CN214377988U (en) | 2021-10-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120424908.0U Active CN214377988U (en) | 2021-02-26 | 2021-02-26 | Switching power supply transformer with good heat dissipation effect |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214377988U (en) |
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2021
- 2021-02-26 CN CN202120424908.0U patent/CN214377988U/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. |
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