A power supply cooling fan control circuit and power module

Abstract

This utility model discloses a power supply cooling fan control circuit and a power module. The power supply cooling fan control circuit includes a first parallel voltage regulator, a first transistor, a first resistor, a second resistor, a third resistor, a shunt resistor, and a first Zener diode. The anode of the first parallel voltage regulator is connected to the first terminals of the first and second resistors. The cathode of the first parallel voltage regulator is connected to the first terminal of the third resistor. The second terminal of the third resistor is connected to the base of the first transistor. The emitter of the first transistor is connected to a 12V input power supply. The collector of the first transistor is connected to the second terminal of the second resistor. The second terminal of the first resistor is grounded. The first terminal of the shunt resistor is connected to the anode of the first parallel voltage regulator, the first terminal of the first resistor, and the first terminal of the second resistor. The second terminal of the shunt resistor is connected to the cathode of the first Zener diode. The anode of the first Zener diode is grounded. This utility model improves the control efficiency and accuracy of the power supply cooling fan.

Description

Technical Field

[0001] This utility model relates to the field of power supply cooling fan control technology, and in particular to a power supply cooling fan control circuit and power module. Background Technology

[0002] Power supplies generate heat during operation, causing their operating temperature to rise, reducing efficiency, and affecting safety and stability. Therefore, a power supply cooling fan is necessary to cool the power supply. Normally, the cooling fan maintains a low speed, but when the power supply temperature is high, the speed needs to be increased for heat dissipation. Currently, power supply cooling fan control circuits typically use a single-stage slope control method, which cannot flexibly adjust the fan speed between normal and high speeds. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the prior art. This utility model provides a power supply cooling fan control circuit and power module, which improves the control efficiency and control accuracy of the power supply cooling fan.

[0004] This utility model provides a power supply cooling fan control circuit, which includes a first parallel voltage regulator, a first transistor, a first resistor, a second resistor, a third resistor, a shunt resistor, and a first Zener diode.

[0005] The anode of the first parallel voltage regulator is connected to the first terminal of the first resistor and the first terminal of the second resistor. The cathode of the first parallel voltage regulator is connected to the first terminal of the third resistor. The second terminal of the third resistor is connected to the base of the first transistor. The emitter of the first transistor is connected to the 12V input power supply. The collector of the first transistor is connected to the second terminal of the second resistor. The second terminal of the first resistor is grounded.

[0006] The first end of the shunt resistor is connected to the anode of the first parallel voltage regulator, the first end of the first resistor, and the first end of the second resistor. The second end of the shunt resistor is connected to the cathode of the first Zener diode, and the anode of the first Zener diode is grounded.

[0007] Furthermore, the power supply cooling fan control circuit also includes a first diode and a second diode, the cathodes of the first diode and the second diode are connected to a 12V input power supply, and the anodes of the first diode and the second diode are connected to the collector of the first transistor.

[0008] Furthermore, the first diode and the second diode are Zener diodes.

[0009] Furthermore, the power supply cooling fan control circuit also includes a first capacitor, the positive terminal of which is connected to the collector of the first transistor, and the negative terminal of which is grounded.

[0010] Furthermore, the first capacitor is a polarized capacitor.

[0011] Furthermore, the power supply cooling fan control circuit also includes a voltage regulator bridge circuit, the output of which is connected to the reference terminal of the first parallel voltage regulator.

[0012] The voltage regulator bridge circuit includes a fourth resistor, a fifth resistor, a sixth resistor, and a seventh resistor.

[0013] Furthermore, the voltage regulator bridge circuit is an H-bridge circuit.

[0014] Furthermore, the power supply cooling fan control circuit also includes an electrical appliance, the first end of which is connected to the collector of the first transistor, and the second end of which is grounded.

[0015] Furthermore, the first parallel voltage regulator is a TL431 parallel voltage regulator.

[0016] This utility model also provides a power supply module, which includes the power cooling fan control circuit described above.

[0017] This utility model provides a power supply cooling fan control circuit and power module. Based on the original single-stage slope control method, a shunt circuit composed of a shunt resistor and a first Zener diode is set at the anode of the first parallel voltage regulator to realize a two-stage slope control method, thereby improving the control efficiency and control accuracy of the power supply cooling fan. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a circuit diagram of the power supply cooling fan control circuit in an embodiment of this utility model. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0021] In this invention, it should be understood that terms such as “comprising” or “having” are intended to indicate the presence of features, figures, steps, actions, components, portions or combinations thereof disclosed in this specification, and are not intended to exclude the possibility of the presence or addition of one or more other features, figures, steps, actions, components, portions or combinations thereof.

[0022] It should also be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] Example 1

[0024] Embodiment 1 of this utility model provides a power supply cooling fan control circuit, which includes a first parallel voltage regulator, a first transistor, a first resistor, a second resistor, a third resistor, a shunt resistor, and a first Zener diode.

[0025] The anode of the first parallel voltage regulator is connected to the first terminal of the first resistor and the first terminal of the second resistor. The cathode of the first parallel voltage regulator is connected to the first terminal of the third resistor. The second terminal of the third resistor is connected to the base of the first transistor. The emitter of the first transistor is connected to the 12V input power supply. The collector of the first transistor is connected to the second terminal of the second resistor. The second terminal of the first resistor is grounded.

[0026] The first end of the shunt resistor is connected to the anode of the first parallel voltage regulator, the first end of the first resistor, and the first end of the second resistor. The second end of the shunt resistor is connected to the cathode of the first Zener diode, and the anode of the first Zener diode is grounded.

[0027] In one optional implementation of this embodiment, such as Figure 1 As shown, Figure 1 The circuit diagram of the power supply cooling fan control circuit in Embodiment 1 of this utility model is shown. The power supply cooling fan control circuit includes a first parallel voltage regulator UF01, a first transistor QF01, a first resistor RF05, a second resistor RF06, a third resistor RF07, a shunt resistor R1, and a first Zener diode Z1.

[0028] The anode A terminal of the first parallel voltage regulator UF01 is connected to the first terminal of the first resistor RF05 and the first terminal of the second resistor RF06. The cathode of the first parallel voltage regulator UF01 is connected to the first terminal of the third resistor RF07. The second terminal of the third resistor RF07 is connected to the base of the first transistor QF01. The emitter of the first transistor QF01 is connected to a 12V input power supply. The collector of the first transistor QF01 is connected to the second terminal of the second resistor RF06. The second terminal of the first resistor RF05 is grounded.

[0029] The first end of the shunt resistor R1 is connected to the anode of the first parallel voltage regulator UF01, the first end of the first resistor RF05, and the first end of the second resistor RF06. The second end of the shunt resistor R1 is connected to the cathode of the first Zener diode Z1, and the anode of the first Zener diode Z2 is grounded.

[0030] In an optional implementation of this embodiment, the power supply cooling fan control circuit further includes a first diode ZDF01 and a second diode ZDF02. The cathodes of the first diode ZDF01 and the second diode ZDF02 are connected to a 12V input power supply, and the anodes of the first diode ZDF01 and the second diode ZDF02 are connected to the collector of the first transistor QF01.

[0031] Furthermore, the first diode ZDF01 and the second diode ZDF02 are Zener diodes.

[0032] In an optional implementation of this embodiment, the power supply cooling fan control circuit further includes a first capacitor CF01, the positive terminal of the first capacitor CF01 being connected to the collector of the first transistor QF01, and the negative terminal of the first capacitor CF01 being grounded.

[0033] Furthermore, the first capacitor CF01 is a polarized capacitor.

[0034] In an optional implementation of this embodiment, the power supply cooling fan control circuit further includes a voltage regulator bridge circuit, the output of which is connected to the reference terminal of the first parallel voltage regulator UF01;

[0035] The voltage regulator bridge circuit includes a fourth resistor RF01, a fifth resistor RF02, a sixth resistor RF03, and a seventh resistor RF04.

[0036] Furthermore, the voltage regulator bridge circuit is an H-bridge circuit.

[0037] In an optional implementation of this embodiment, the power supply cooling fan control circuit further includes a power supply CNF01, the first terminal of which is connected to the collector of the first transistor QF01, and the second terminal of which is grounded.

[0038] In an optional implementation of this embodiment, the first parallel regulator UF01 is a TL431 parallel regulator.

[0039] The working principle of this embodiment is as follows:

[0040] A shunt circuit consisting of a shunt resistor R1 and a first Zener diode Z1 is set at the anode of the first parallel voltage regulator UF01. When the voltage between the reference terminal and the anode of the first parallel voltage regulator UF01 is 2.5V, the shunt circuit is in a steady state. At this time, the circuit is analyzed as being in a steady state. The voltage at the anode and the voltage of the fan can be calculated by subtracting 2.5V from the reference terminal of the first parallel voltage regulator UF01.

[0041] When the anode voltage of the first parallel regulator UF01 is greater than the breakdown voltage of the first Zener diode Z1, the first Zener diode Z1 conducts, and current flows into the shunt resistor R1. This current, when added to the current flowing into the first resistor RF05, becomes the current flowing through the second resistor RF06. This increases the voltage drop across the second resistor RF06. With the first parallel regulator UF01 set to fixed parameters, this increases the output voltage, which in turn increases the fan operating voltage, allowing the fan to adjust from low speed to high speed. This achieves a two-stage slope control method with two slopes corresponding to the presence or absence of the breakdown voltage of the first Zener diode Z1.

[0042] In summary, this utility model embodiment proposes a power supply cooling fan control circuit. Based on the original single-stage slope control method, a shunt circuit composed of a shunt resistor and a first Zener diode is set at the anode of the first parallel voltage regulator to realize a two-stage slope control method, thereby improving the control efficiency and control accuracy of the power supply cooling fan.

[0043] Example 2

[0044] This utility model provides a power module in embodiment two, which includes the power cooling fan control circuit in embodiment one.

[0045] The above provides a detailed description of a power supply cooling fan control circuit and power module provided by the embodiments of this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A power supply cooling fan control circuit, characterized in that, The power supply cooling fan control circuit includes a first parallel voltage regulator, a first transistor, a first resistor, a second resistor, a third resistor, a shunt resistor, and a first Zener diode; The anode of the first parallel voltage regulator is connected to the first terminal of the first resistor and the first terminal of the second resistor. The cathode of the first parallel voltage regulator is connected to the first terminal of the third resistor. The second terminal of the third resistor is connected to the base of the first transistor. The emitter of the first transistor is connected to the 12V input power supply. The collector of the first transistor is connected to the second terminal of the second resistor. The second terminal of the first resistor is grounded. The first end of the shunt resistor is connected to the anode of the first parallel voltage regulator, the first end of the first resistor, and the first end of the second resistor. The second end of the shunt resistor is connected to the cathode of the first Zener diode, and the anode of the first Zener diode is grounded.

2. The power supply cooling fan control circuit as described in claim 1, characterized in that, The power supply cooling fan control circuit also includes a first diode and a second diode. The cathodes of the first diode and the second diode are connected to a 12V input power supply, and the anodes of the first diode and the second diode are connected to the collector of the first transistor.

3. The power supply cooling fan control circuit as described in claim 2, characterized in that, The first diode and the second diode are Zener diodes.

4. The power supply cooling fan control circuit as described in claim 1, characterized in that, The power supply cooling fan control circuit also includes a first capacitor, the positive terminal of which is connected to the collector of the first transistor, and the negative terminal of which is grounded.

5. The power supply cooling fan control circuit as described in claim 4, characterized in that, The first capacitor is a polarized capacitor.

6. The power supply cooling fan control circuit as described in claim 1, characterized in that, The power supply cooling fan control circuit also includes a voltage regulator bridge circuit, the output of which is connected to the reference terminal of the first parallel voltage regulator. The voltage regulator bridge circuit includes a fourth resistor, a fifth resistor, a sixth resistor, and a seventh resistor.

7. The power supply cooling fan control circuit as described in claim 6, characterized in that, The voltage regulator bridge circuit is an H-bridge circuit.

8. The power supply cooling fan control circuit as described in claim 1, characterized in that, The power supply cooling fan control circuit also includes an electrical appliance, the first end of which is connected to the collector of the first transistor, and the second end of which is grounded.

9. The power supply cooling fan control circuit as described in claim 1, characterized in that, The first parallel voltage regulator is a TL431 parallel voltage regulator.

10. A power supply module, characterized in that, The power module includes the power cooling fan control circuit according to any one of claims 1-9.

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