Cooling fan control circuit
By designing a cooling fan control circuit containing resistors and transistors, the problem that early switching power supply cooling fan control circuits cannot flexibly control the fan speed is solved, and flexible control of fan speed and unified specifications and models are achieved, reducing procurement costs.
Patent Information
- Application Number
- CN202422623117.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2025-08-05
- Estimated Expiration
- 2034-10-29
AI Technical Summary
Early switching power supply cooling fan control circuits could not flexibly control the fan speed, resulting in uncontrollable wind speed and low system efficiency. Different power supply output voltages require fans of different specifications and models, increasing procurement costs and inventory risks.
A cooling fan control circuit including resistors, transistors and diodes is designed. By adjusting the resistance value and circuit combination, it can achieve flexible control of fan speed, adapt to different power output voltages, and unify fan specifications and models.
It realizes flexible control of fan speed, improves power conversion efficiency, reduces fan specifications and models, and reduces procurement costs.
Smart Images
Figure CN223190669U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of fan control, in particular to a heat dissipation fan control circuit. Background Art
[0002] Early switching power supply cooling fan control circuits were primarily powered directly by the output voltage. Advantages included simplified peripheral circuitry, reduced production process steps, and low cost. Disadvantages included uncontrollable fan speed, resulting in uncontrolled wind speed and low system efficiency. Furthermore, the increasing number of fan models and specifications necessitated the use of fans with varying power supply output voltages, increasing procurement costs and creating inventory risks. With the advancement and innovation of science and technology, switching power supply technology is also undergoing continuous innovation. This cost reversal point is increasingly shifting towards lower output power levels, providing ample room for development in switching power supplies requiring high efficiency and intelligent control. Utility Model Content
[0003] The purpose of the utility model is to provide a heat dissipation fan control circuit.
[0004] To achieve the above object, the present invention provides the following technical solution: a cooling fan control circuit, comprising resistors R201, R202, R203, R204, R205, R206, JR1, JR2, transistors Q6, Q7, diodes ZD2, ZD3 and capacitor EC201, one end of the resistor R201 is connected to the resistors JR1, JR2 and R206 in sequence, one end of the resistor R202 is connected to the collector of the transistor Q6, the emitter of the transistor Q6 is connected to the collector of the transistor Q7 through the resistor R204, the base of the transistor Q6 is connected to the cathode of the diode ZD2, and the anode of the diode ZD2 is connected to the anode of the diode ZD3 through the diode Z The anode of D3 is connected to the resistor R206, the cathode of the diode ZD3 is connected between the resistor R204 and Q7, and between JR1 and JR2 in sequence through the resistor R205, the emitter of the transistor Q7 is connected between JR2 and R206, and the base of the transistor Q7 is connected between the resistor R205 and the diode ZD3, one end of the resistor R203 is connected between the resistor R202 and the transistor Q6, and between the resistor R201 and the resistor JR1 in sequence, and the other end of the resistor 203 is connected between the transistor Q6 and ZD2, one end of the capacitor EC201 is connected to the emitter of the transistor Q7, and the other end is connected between the resistor R206 and the diode ZD3.
[0005] Furthermore, the resistance values of the resistors JR1 and JR2 are 0.
[0006] Furthermore, the models of the transistors Q6 and Q7 are both 9013.
[0007] Furthermore, the models of the diodes ZD2 and ZD3 are BZ24 and BZ12 respectively.
[0008] It can be seen from the above technical solution that the utility model has the following beneficial effects:
[0009] The cooling fan control circuit can flexibly control the fan speed, which is beneficial to high power conversion efficiency, reduces the requirements for fan specifications and models, unifies fan specifications and models, and reduces procurement costs. It is an energy-saving and environmentally friendly fan control circuit. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 This is the overall circuit diagram of the utility model. DETAILED DESCRIPTION
[0011] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," "the other end," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0012] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc. should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in this utility model based on the specific circumstances.
[0013] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0014] like Figure 1As shown, the utility model provides a cooling fan control circuit, including a cooling fan control circuit, including resistors R201, R202, R203, R204, R205, R206, JR1, JR2, transistors Q6, Q7, diodes ZD2, ZD3 and capacitor EC201, the models of diodes ZD2 and ZD3 are BZ24 and BZ12 respectively, the models of transistors Q6 and Q7 are 9013, one end of the resistor R201 is connected to the resistors JR1, JR2 and R206 in sequence, one end of the resistor R202 is connected to the collector of the transistor Q6, the emitter of the transistor Q6 is connected to the collector of the transistor Q7 through the resistor R204, and the base of the transistor Q6 is connected to the diode The cathode of ZD2, the anode of diode ZD2 is connected to resistor R206 through the anode of diode ZD3, the cathode of diode ZD3 is connected in sequence between resistors R204 and Q7, and between JR1 and JR2 through resistor R205, the emitter of transistor Q7 is connected between JR2 and R206, the base of transistor Q7 is connected between resistor R205 and diode ZD3, one end of the resistor R203 is connected in sequence between resistor R202 and transistor Q6, and between resistor R201 and resistor JR1, the other end of resistor 203 is connected between transistor Q6 and ZD2, one end of the capacitor EC201 is connected to the emitter of transistor Q7, and the other end is connected between resistor R206 and diode ZD3.
[0015] Working principle: When the output voltage of the switching power supply is DC12V, R203, R204, R205, Q6, Q7, ZD2, and ZD3 are removed, and R201, R202, R206, JR1(0R), JR2(0R), and EC201 are in operation. The fan works normally, and the fan speed can be adjusted by adjusting the resistance values of R201 and R202.
[0016] When the output voltage of the switching power supply is DC15-24V, the R203, R204, Q6, ZD2, and JR2 circuits are removed, and the R201, R202, R205, R206, JR1 (0R), Q7, ZD3, and EC201 circuits reduce the input voltage and stabilize it at DC12V, and the fan works normally;
[0017] When the output voltage of the switching power supply is greater than DC30V, the JR1 and JR2 components are removed, and the R201, R202, R203, Q6, and ZD2 circuits reduce the input voltage and stabilize it at DC24V output. The R204, R205, R206, Q7, ZD3, and EC201 circuits reduce the DC24V input voltage and stabilize it at DC12V, and the fan works normally.
[0018] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A cooling fan control circuit, characterized in that: The circuit includes resistors R201, R202, R203, R204, R205, R206, JR1, JR2, transistors Q6, Q7, diodes ZD2, ZD3 and capacitor EC201. One end of the resistor R201 is connected to the resistors JR1, JR2 and R206 in sequence. One end of the resistor R202 is connected to the collector of the transistor Q6. The emitter of the transistor Q6 is connected to the collector of the transistor Q7 through the resistor R204. The base of the transistor Q6 is connected to the cathode of the diode ZD2. The anode of the diode ZD2 is connected to the resistor R206 through the anode of the diode ZD3. The cathode of transistor ZD3 is connected in sequence between resistor R204 and Q7, and between JR1 and JR2 through resistor R205. The emitter of transistor Q7 is connected between JR2 and R206. The base of transistor Q7 is connected between resistor R205 and diode ZD3. One end of the resistor R203 is connected in sequence between resistor R202 and transistor Q6, and between resistor R201 and resistor JR1. The other end of resistor R203 is connected between transistor Q6 and ZD2. One end of the capacitor EC201 is connected to the emitter of transistor Q7, and the other end is connected between resistor R206 and diode ZD3.
2. The cooling fan control circuit according to claim 1, wherein: The resistance value of the resistors JR1 and JR2 is 0.
3. The cooling fan control circuit according to claim 1, wherein: The models of the transistors Q6 and Q7 are both 9013.
4. The cooling fan control circuit according to claim 1, wherein: The diodes ZD2 and ZD3 are of types BZ24 and BZ12 respectively.