CN211606415U - Switching power supply circuit capable of automatically controlling heat dissipation power of fan - Google Patents
Switching power supply circuit capable of automatically controlling heat dissipation power of fan Download PDFInfo
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- CN211606415U CN211606415U CN202020310512.9U CN202020310512U CN211606415U CN 211606415 U CN211606415 U CN 211606415U CN 202020310512 U CN202020310512 U CN 202020310512U CN 211606415 U CN211606415 U CN 211606415U
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Abstract
A switching power supply circuit capable of automatically controlling heat dissipation power of a fan comprises a power transformer, a rectifying circuit, a current-limiting transformer, a rectifying and filtering circuit, a heat dissipation fan and a filtering circuit. The primary side of the power transformer is connected with a pulse power supply, the secondary side of the power transformer is connected with the input end of the rectifying circuit, the output end of the rectifying circuit is connected with one end of the primary side of the current-limiting transformer, the other end of the primary side of the current-limiting transformer is connected with the input end of the filter circuit, and the output end of the filter circuit is; the secondary side of the current-limiting transformer is connected with the input end of a rectifying and filtering circuit, and the output end of the rectifying and filtering circuit is connected with a cooling fan; and a flyback energy-taking mode is adopted to supply power to the fan. The characteristics of narrow pulse width and wide pulse width when the load is light are utilized, and the output power of the fan can be automatically adjusted when the switch power supply outputs different powers by matching the primary side inductor of the current-limiting transformer, and meanwhile, the problem of ripple noise caused by direct power taking of the fan on a main output loop is avoided.
Description
Technical Field
The utility model relates to a power electronic technology field, in particular to automatic switching power supply circuit of control fan heat dissipation power.
Background
With the development and innovation of power electronic technology, the technology of the switching power supply is continuously innovated. At present, switching power supplies are widely used in almost all electronic devices due to their small size, light weight and high efficiency, and are an indispensable power supply for the rapid development of the power industry today.
With the continuous improvement of power required by power equipment and the continuous increase of power density of the switching power supply, the heat dissipation requirement on the switching power supply is higher and higher, the switching power supply with low power generally adopts natural cooling, and the switching power supply with higher power adopts an air cooling heat dissipation mode to reduce the temperature of a power device of the switching power supply.
The air cooling design of the common switch power supply generally adopts a fixed power supply to supply power for an air cooling fan, but the design can cause unnecessary service life loss of the fan when the output power of the switch power supply is lower without overlarge heat dissipation power but the fan is always in a full-load running state, and simultaneously generates larger power waste and unnecessary noise.
Disclosure of Invention
In order to solve the technical problem that the background art provided, the utility model provides an automatic control fan heat dissipation power's switching power supply circuit adopts the flyback energy-taking mode to supply power for the fan. The circuit utilizes the characteristics of narrow pulse width when the load is slight and wide pulse width when the load is heavy, and can automatically adjust the output power of the fan when the switching power supply outputs different powers by matching the primary side inductor of the current-limiting transformer, namely, the fan works at full power and high rotating speed when the switching power supply outputs larger power, the fan works at low power and low rotating speed when the switching power supply outputs smaller power, and simultaneously, the problem of ripple noise caused by direct power taking of the fan on a main output circuit is avoided.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a switching power supply circuit capable of automatically controlling heat dissipation power of a fan comprises a power transformer, a rectifying circuit, a current-limiting transformer, a rectifying and filtering circuit, a heat dissipation fan and a filtering circuit.
The primary side of the power transformer is connected with a pulse power supply, the secondary side of the power transformer is connected with the input end of the rectifying circuit, the output end of the rectifying circuit is connected with one end of the primary side of the current-limiting transformer, the other end of the primary side of the current-limiting transformer is connected with the input end of the filter circuit, and the output end of the filter circuit is; the secondary side of the current-limiting transformer is connected with the input end of the rectifying and filtering circuit, and the output end of the rectifying and filtering circuit is connected with the cooling fan.
The rectification circuit is a half-wave rectification circuit and comprises a first rectification diode and a freewheeling diode, one end of the first rectification diode is connected with one end of the secondary side of the power transformer, the other end of the first rectification diode is connected with one end of the primary side of the current-limiting transformer, one end of the freewheeling diode and the first rectification diode are connected with one end of the primary side of the current-limiting transformer, and the other end of the freewheeling diode is connected with the other end of.
The filter circuit is a first filter capacitor connected in parallel at two ends of the load output end.
The rectifying and filtering circuit comprises a second rectifying diode and a second filtering capacitor, one end of the second rectifying diode is connected with the secondary side of the current-limiting transformer, the other end of the second rectifying diode is connected with the cooling fan, and the second filtering capacitor is connected in parallel at two ends of the cooling fan.
And the transformer turn ratio of the current-limiting transformer is consistent with the ratio of the output voltage of the switching power supply and the output voltage of the fan power supply.
The homonymous end of the current-limiting transformer is set to be capable of providing energy to the fan side in the freewheeling stage of the rectifying circuit.
Compared with the prior art, the beneficial effects of the utility model are that:
1) the utility model discloses a fan power supply energy is got from the current-limiting transformer of main power side, and when load power is slight, the fan is in low-power low-speed operating condition, has prolonged the life-span of fan;
2) the utility model discloses a fan rotational speed has the correlation with switching power supply's load power, avoids unnecessary noise and power loss under the switching power supply low power operating condition;
3) the utility model has the advantages of simple circuit, less components and high reliability;
4) utility model's fan does not get the electricity from switching power supply output side in the circuit, has avoided traditional fan to get the ripple noise problem that the electricity caused from the major loop.
Drawings
Fig. 1 is a block diagram of a circuit structure of a switching power supply circuit for automatically controlling heat dissipation power of a fan according to the present invention;
fig. 2 is a circuit diagram of a switching power supply circuit for automatically controlling the heat dissipation power of the fan according to the present invention.
In the figure: 1-power transformer 2-first rectifier diode 3-freewheeling diode 4-current limiting transformer 5-second rectifier diode 6-second filter capacitor 7-first filter capacitor 8-radiator fan 9-load.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.
As shown in fig. 1-2, a switching power supply circuit for automatically controlling the heat dissipation power of a fan includes a power transformer 1, a rectifying circuit, a current-limiting transformer 4, a rectifying and filtering circuit, a heat dissipation fan 8, and a filtering circuit.
The primary side of the power transformer 1 is connected with a pulse power supply, the secondary side of the power transformer is connected with the input end of a rectifying circuit, the output end of the rectifying circuit is connected with one end of the primary side of the current-limiting transformer 4, the other end of the primary side of the current-limiting transformer 4 is connected with the input end of a filter circuit, and the output end of the filter circuit is; the secondary side of the current-limiting transformer 4 is connected with the input end of a rectifying and filtering circuit, and the output end of the rectifying and filtering circuit is connected with a cooling fan 8.
The pulse power source on the primary side of the power transformer 1 is generally from a forward circuit.
The rectification circuit is a half-wave rectification circuit and comprises a first rectification diode 2 and a freewheeling diode 3, one end of the first rectification diode 2 is connected with one end of the secondary side of the power transformer 1, the other end of the first rectification diode 2 is connected with one end of the primary side of the current limiting transformer 4, one end of the freewheeling diode 3 and the first rectification diode 2 are connected with one end of the primary side of the current limiting transformer 4, and the other end of the freewheeling diode is connected with the other end of the secondary.
The filter circuit is a first filter capacitor 7 connected in parallel at two ends of the load output end.
The rectifying and filtering circuit comprises a second rectifying diode 5 and a second filtering capacitor 6, one end of the second rectifying diode 5 is connected with the secondary side of the current-limiting transformer 4, the other end of the second rectifying diode is connected with the cooling fan 8, and the second filtering capacitor 6 is connected with the two ends of the cooling fan in parallel.
The transformer turn ratio of the current-limiting transformer 4 is consistent with the proportion of the output voltage of the switching power supply and the voltage of the fan power supply; the current limiting transformer 4 is arranged at the end with the same name, and energy is allowed to be provided to the fan side only in the afterflow stage of the circuit.
The circuit principle of the utility model is summarized as:
1) the rectification circuit is a half-wave rectification circuit and is divided into a rectification stage and a follow current stage;
2) in the rectification stage, the primary winding of the current-limiting transformer 4 is used as a filter inductor;
3) in the freewheeling stage, the primary winding of the current-limiting transformer 4 is used as a filter inductor and also as a transformer; the secondary side of the fan power supply circuit is built according to the flyback circuit principle; the fan is powered and the power varies as the power of the load varies.
The specific circuit principle is explained in fig. 2 as follows:
1) when the primary side of the power transformer 1 is positive voltage (the synonym terminal of the primary side of the power transformer 1 is positive), the secondary side of the power transformer 1 also outputs positive voltage, the current is limited by the primary side of the current-limiting transformer 4 to charge the first filter capacitor 7 and supply power to the load 9, the primary side of the current-limiting transformer 4 bears negative voltage, and the second rectifier diode 2 is cut off and cannot supply power to the fan power supply.
2) When the primary side of the power transformer 1 is a negative voltage (the same name end of the primary side of the power transformer 1 is a negative), the secondary side of the power transformer 1 also outputs a negative voltage, and the load 9 cannot be continuously supplied with power. Meanwhile, the primary side excitation inductance of the current-limiting transformer 4 carries out follow current through the first filter capacitor 7 and the follow current diode 3, and the primary side of the current-limiting transformer 4 is positive voltage.
3) When the primary excitation inductor of the current-limiting transformer 4 is in a freewheeling state, the secondary side of the current-limiting transformer 4 outputs a positive voltage, and the positive voltage is rectified and filtered by the second rectifier diode 5 and the second filter capacitor 6 to supply power to the direct current fan 8.
4) When the power consumption of the load 9 is low, the duty ratio of the primary side of the power transformer 1 with positive voltage is also narrow, the time for rectifying the current-limiting transformer 4 is short, the stored energy is also small, and further the coupling energy to the fan power supply is also small when the current-limiting transformer 4 is in a follow current state, so that the rotating speed of the fan 8 is reduced.
The above embodiments are implemented on the premise of the technical solution of the present invention, and detailed implementation and specific operation processes are given, but the protection scope of the present invention is not limited to the above embodiments. The methods used in the above examples are conventional methods unless otherwise specified.
Claims (6)
1. A switching power supply circuit for automatically controlling the heat dissipation power of a fan is characterized by comprising a power transformer, a rectifying circuit, a current-limiting transformer, a rectifying and filtering circuit, a heat dissipation fan and a filtering circuit;
the primary side of the power transformer is connected with a pulse power supply, the secondary side of the power transformer is connected with the input end of the rectifying circuit, the output end of the rectifying circuit is connected with one end of the primary side of the current-limiting transformer, the other end of the primary side of the current-limiting transformer is connected with the input end of the filter circuit, and the output end of the filter circuit is;
the secondary side of the current-limiting transformer is connected with the input end of the rectifying and filtering circuit, and the output end of the rectifying and filtering circuit is connected with the cooling fan.
2. The switching power supply circuit according to claim 1, wherein the rectifier circuit is a half-wave rectifier circuit including a first rectifier diode and a freewheeling diode, the first rectifier diode is connected to one end of the secondary side of the power transformer and the other end of the first rectifier diode is connected to one end of the primary side of the current limiting transformer, the freewheeling diode is connected to one end of the primary side of the current limiting transformer and the other end of the first rectifier diode is connected to the other end of the secondary side of the power transformer.
3. The switching power supply circuit according to claim 1, wherein the filter circuit is a first filter capacitor connected in parallel to the load output terminal.
4. The switching power supply circuit for automatically controlling heat dissipation power of a fan as claimed in claim 1, wherein said rectifying and filtering circuit comprises a second rectifying diode and a second filtering capacitor, one end of the second rectifying diode is connected to the secondary side of the current limiting transformer, the other end of the second rectifying diode is connected to the heat dissipation fan, and the second filtering capacitor is connected in parallel to two ends of the heat dissipation fan.
5. The switching power supply circuit according to claim 1, wherein the transformer turn ratio of the current limiting transformer is substantially equal to the ratio of the switching power supply output voltage to the fan power supply output voltage.
6. The switching power supply circuit according to claim 1, wherein the dotted terminal of the current limiting transformer is configured to supply energy to the fan side only during a freewheeling stage of the rectifying circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020310512.9U CN211606415U (en) | 2020-03-13 | 2020-03-13 | Switching power supply circuit capable of automatically controlling heat dissipation power of fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020310512.9U CN211606415U (en) | 2020-03-13 | 2020-03-13 | Switching power supply circuit capable of automatically controlling heat dissipation power of fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211606415U true CN211606415U (en) | 2020-09-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020310512.9U Active CN211606415U (en) | 2020-03-13 | 2020-03-13 | Switching power supply circuit capable of automatically controlling heat dissipation power of fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211606415U (en) |
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2020
- 2020-03-13 CN CN202020310512.9U patent/CN211606415U/en active Active
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