A unidirectional fan direct current voltage regulating circuit and a unidirectional fan

Abstract

The utility model discloses a one -way fan direct current pressure regulating circuit and one -way fan, one -way fan direct current pressure regulating circuit includes input interface CN1, filter module, voltage reducing chip U1, voltage stabilizing module, modulate right module and output interface CN2, input interface CN1 has one end, two end and three end, voltage reducing chip U1 has IN pin, EN pin, FSW pin, SW pin and FB pin, and output interface CN2 has four end and five end, one end of filter module is connected with one end of input interface CN1 and IN pin of voltage reducing chip U1 respectively, and its other end is grounded with two end of input interface CN1, one end of voltage stabilizing module is connected with SW pin of voltage reducing chip U1 and four end of output interface CN2 respectively, and its other end is connected with five end of output interface CN2 and is grounded, and the input of modulate right module is connected with three end of input interface CN1, and its output is connected with FB end of voltage reducing chip U1.

Description

Technical Field

[0001] This utility model relates to the field of fan voltage regulation technology, specifically to a unidirectional fan DC voltage regulation circuit and a unidirectional fan. Background Technology

[0002] A unidirectional DC fan is a fan powered by a DC power converter. It is characterized by low noise, strong airflow, and low power consumption, and is therefore widely used in industrial heat dissipation applications.

[0003] Existing unidirectional DC fan voltage regulation controls typically only have on / off functions. Therefore, existing unidirectional DC fans only have switching functions and cannot achieve multi-speed regulation. Consequently, traditional unidirectional DC fans can no longer meet consumers' speed regulation requirements. Utility Model Content

[0004] To address the shortcomings of existing technologies, a unidirectional fan DC voltage regulation circuit and a unidirectional fan are provided.

[0005] To achieve the above objectives, this utility model provides a unidirectional fan DC voltage regulation circuit, including an input interface CN1, a filter module, a step-down chip U1, a voltage regulator module, a weighting module, and an output interface CN2. The input interface CN1 has terminals 1, 2, and 3; the step-down chip U1 has IN pin, EN pin, FSW pin, SW pin, and FB pin; and the output interface CN2 has terminals 4 and 5. One end of the filter module is connected to terminal 1 of the input interface CN1 and the IN pin of the step-down chip U1, and its other end is grounded together with terminal 2 of the input interface CN1. One end of the voltage regulator module is connected to the SW pin of the step-down chip U1 and terminal 4 of the output interface CN2, and its other end is grounded together with terminal 5 of the output interface CN2. The input terminal of the weighting module is connected to terminal 3 of the input interface CN1, and its output terminal is connected to the FB terminal of the step-down chip U1.

[0006] According to one embodiment of the present invention, it further includes a voltage divider module, which includes resistors R1 and R3. One end of resistor R1 is connected to the IN pin of the filter module and the step-down chip U1, respectively, and the other end is connected to resistor R3 and the EN pin of the step-down chip U1, respectively. The other end of resistor R3 is grounded.

[0007] According to one embodiment of the present invention, the filtering module includes capacitor C1 and capacitor C5. One end of capacitor C1 is connected to the first terminal of input interface CN1 and the IN pin of step-down chip U1, and the other end of capacitor C1 is grounded together with the second terminal of input interface CN1. Capacitor C5 is connected in parallel with capacitor C1.

[0008] According to one embodiment of the present invention, the weighting module includes a diode D1, an RC unit and a voltage divider unit. The positive terminal of the diode D1 is connected to the third terminal of the input interface CN1, and its negative terminal is connected to the RC unit. The other end of the RC unit is connected to the voltage divider unit, and the voltage divider unit is also connected to the FB pin of the step-down chip U1.

[0009] According to one embodiment of the present invention, the voltage regulator module includes an inductor L1, a capacitor C4, a capacitor C2 and a capacitor C3. One end of the inductor L1 is connected to the SW pin of the step-down chip U1, and the other end is connected to the capacitors C4, C2 and C3 and the fourth terminal of the output interface CN2, respectively. The other end of the capacitor C4 is connected to the weighting module, and the other ends of the capacitors C2 and C3 are grounded.

[0010] According to one embodiment of the present invention, a resistor R2 is also included, one end of which is connected to the FSW pin of the step-down chip U1, and the other end is grounded.

[0011] According to one embodiment of the present invention, it further includes an output RC module, which includes a resistor R6 and a capacitor C6. One end of the resistor R6 is connected to the voltage regulator module and the fourth terminal of the output interface CN2, and the other end is grounded. The capacitor C6 is connected in parallel with the resistor R6.

[0012] According to one embodiment of the present invention, the RC unit includes a resistor R7, a capacitor C7 and a capacitor C8. One end of the resistor R7 is connected to the negative terminal of the diode D1, and the other end is connected to the capacitors C7, C8 and the voltage divider unit respectively. The other ends of the capacitors C7 and C8 are grounded together.

[0013] According to one embodiment of the present invention, the voltage divider unit includes resistors R8, R5A, R5B and R4. One end of resistor R8 is connected to the RC unit, and the other end is connected to the FB pin of the step-down chip U1, resistors R5A, R5B and R4 respectively. The other end of resistor R4 is connected to the voltage regulator module, and the other ends of resistors R5A and R5B are grounded.

[0014] This utility model also provides a unidirectional fan, including the aforementioned unidirectional fan DC voltage regulation circuit.

[0015] The beneficial effect of this utility model is that by setting a weighting module, the weighting module converts PWM into an analog signal, and the step-down chip U1 adjusts the output voltage according to the analog signal output by the weighting module. By outputting different voltages, the speed of the fan can be adjusted, making the fan suitable for different usage scenarios. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0017] Figure 1 This is a diagram of a unidirectional fan-type DC voltage regulation circuit in the embodiment.

[0018] Explanation of reference numerals in the attached figures

[0019] 1. Filtering module; 2. Voltage regulation module; 3. Weighting module; 31. RC unit; 32. Voltage divider unit; 4. Voltage divider module; 5. Output RC module. Detailed Implementation

[0020] The following drawings will disclose several embodiments of this utility model. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit this utility model. That is, in some embodiments of this utility model, these practical details are not essential. In addition, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0021] Furthermore, in this utility model, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the utility model. They are merely used to distinguish components or operations described with the same technical terms and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0022] This embodiment provides a unidirectional fan DC voltage regulation circuit, which includes an input interface CN1, a filter module 1, a buck chip U1, a voltage regulator module 2, a weighting module 3, and an output interface CN2. The input interface CN1 has terminals 1, 2, and 3. The buck chip U1 has pins IN, EN, FSW, SE, and FB. The input interface CN2 has terminals 4 and 5. The input interface CN1 serves as the input connection terminal for the unidirectional fan DC voltage regulation circuit. During connection, one end of the filter module 1 is connected to both terminal 1 of the input interface CN1 and the IN pin of the buck chip U1, while its other end, along with terminal 2 of the input interface CN1, is connected to ground. One end of the voltage regulator module 2 is connected to both the SW pin of the buck chip U1 and terminal 4 of the output interface CN2, while its other end, along with terminal 5 of the output interface CN2, is connected to ground. The input terminal of the weighting module 3 is connected to terminal 3 of the input interface CN1, and its output terminal is connected to the FB terminal of the buck chip U1.

[0023] In practical applications, input interface CN1 is used to connect to an external main control board. Pin 1 of input interface CN1 receives DC voltage, pin 2 is grounded, and pin 3 receives PWM signals. It should be noted that the PWM signal is generated by the external main control board. During use, the externally input DC voltage is input into the unidirectional fan DC voltage regulator circuit via input interface CN1, and then filtered by filter module 1 to remove high-frequency noise. It is then input to the IN and EN pins of buck converter U1. Upon receiving the voltage, the EN pin of buck converter U1 is enabled, causing buck converter U1 to operate. Buck converter U1 receives the voltage and steps it down to output a suitable voltage. Voltage regulator module 2 filters and regulates the output voltage of buck converter U1 to form a smooth voltage signal. Weighting module 3 receives the externally output PWM signal and converts it into an analog signal. The analog signal output by weighting module 3 is sent to the FB pin of buck converter U1. After receiving the analog signal output by the weighting module 3, the buck chip U1 adjusts the output voltage according to the analog signal to achieve voltage adjustment. The voltage output by the buck chip U1 is then output from the output interface CN2 after passing through the voltage regulator module 2.

[0024] In this way, the PWM is converted into an analog signal by the weighting module 3, and the buck chip U1 adjusts the output voltage according to the analog signal output by the weighting module 3. By outputting different voltages, the speed of the fan can be adjusted, making the fan suitable for different usage scenarios.

[0025] Filter module 1 includes capacitors C1 and C5. One end of capacitor C1 is connected to both the first terminal of input interface CN1 and the IN pin of the step-down chip U1, while the other end is grounded along with the second terminal of input interface CN1. Capacitor C5 is connected in parallel with capacitor C1. Both capacitors C1 and C5 are used for filtering.

[0026] Furthermore, the unidirectional fan-driven DC voltage regulation circuit also includes a voltage divider module 4. The voltage divider module 4 includes resistors R1 and R3. One end of resistor R1 is connected to the IN pin of both the filter module 1 and the buck chip U1, while the other end is connected to both resistor R3 and the EN pin of the buck chip U1. The other end of resistor R3 is grounded. Resistors R1 and R3 are used to divide the voltage output from the filter module 1, preventing the voltage from being directly output to the EN pin of the buck chip U1, which could damage the EN pin of the buck chip U1.

[0027] The voltage regulator module 2 includes an inductor L1, capacitors C4, C2, and C3. One end of inductor L1 is connected to the SW pin of the step-down chip U1, and the other end is connected to capacitors C4, C2, C3, and pin 4 of the output interface CN2. One end of capacitor C4 is connected to the weighting module 3, and the other ends of capacitors C2 and C3 are grounded.

[0028] Inductor L1 smooths the output voltage of buck converter chip U1 through energy storage and release processes, ensuring the stability of the output voltage. Capacitors C4, C2, and C3 are used for filtering to remove high-level noise and ripple in the output voltage of buck converter chip U1, thereby improving the purity of the voltage.

[0029] The weighting module 3 includes a diode D1, an RC unit 31, and a voltage divider unit 32. The positive terminal of diode D1 is connected to terminal 3 of the output interface CN1, and the negative terminal of diode D1 is connected to the RC unit 31. The other end of the RC unit 31 is connected to the voltage divider unit 32, which is also connected to the FB pin of the step-down chip U1.

[0030] In actual use, the PWM signal is input to the positive terminal of diode D1 after being input to the DC voltage regulation circuit of the unidirectional fan. Diode D1 is used to conduct the PWM signal in one direction. After passing through diode D1, the PWM signal is input to RC unit 31. RC unit 31 converts the PWM signal into an analog signal. Then, the analog signal is divided by voltage divider unit 32 and input to the FB pin of buck chip U1.

[0031] Furthermore, RC unit 31 includes resistor R7, capacitor C7, and capacitor C8. One end of resistor R7 is connected to the cathode of diode D1, and the other end is connected to capacitor C7, capacitor C8, and voltage divider unit 32. The other ends of capacitors C7 and C8 are connected to ground.

[0032] In this embodiment, resistor R7 is a damping resistor. Resistor R7 is used to stabilize the circuit and reduce signal fluctuations. In this example, capacitors C7 and C8 are both energy storage capacitors. After the PWM signal is input to the unidirectional fan DC voltage regulation circuit, it passes through diode D1 and resistor R7 in sequence, and then through the charging and discharging process of capacitors C7 and C8. This process filters out the high-frequency pulse part of the PWM signal, thereby converting the PWM signal into an analog signal. At the same time, it helps to reduce voltage fluctuations and improve the stability of the circuit.

[0033] Voltage divider unit 32 includes resistors R8, R5A, R5B, and R4. One end of resistor R8 is connected to RC unit 31, and the other end is connected to the FB pin of buck chip U1, resistors R5A, R5B, and R4, respectively. The other end of resistor R4 is connected to voltage regulator module 2, and the other ends of resistors R5A and R5B are grounded.

[0034] In this example, one end of resistor R8 is connected to resistors R7, capacitors C7 and C8, and its other end is connected to the FB pin of buck converter U1, resistors R5A, R5B, and R4. One end of resistor R4 is connected to inductor L1 and capacitor C4, and its other end is connected to the FB pin of buck converter U1, resistors R5A and R5B. Resistor R8 is used for current limiting, and simultaneously, resistors R8, R5A, R5B, and R4 form a voltage divider network to regulate the voltage input to the FB pin of buck converter U1.

[0035] Furthermore, the unidirectional fan DC voltage regulator circuit also includes an output RC module. The output RC module includes a resistor R6 and a capacitor C6. One end of resistor R6 is connected to both the voltage regulator module 2 and terminal 4 of the output interface CN2, while the other end is grounded. Capacitor C6 is connected in parallel with resistor R6. Resistor R6 and capacitor C6 form an RC filter network to further eliminate noise in the output electrical signal and improve the smoothness of the output voltage signal.

[0036] In addition, the unidirectional fan DC voltage regulation circuit also includes resistor R2. One end of resistor R2 is connected to the FSW pin of the buck converter chip U1, and the other end is grounded. Resistor R2 is used to protect the FSW pin of the buck converter chip U1.

[0037] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A unidirectional fan DC voltage regulation circuit, characterized in that, include: The system comprises an input interface CN1, a filter module (1), a step-down chip U1, a voltage regulator module (2), a weighting module (3), and an output interface CN2. The input interface CN1 has a first terminal, a second terminal, and a third terminal. The step-down chip U1 has an IN pin, an EN pin, an FSW pin, a SW pin, and an FB pin. The output interface CN2 has a fourth terminal and a fifth terminal. One end of the filter module (1) is connected to the first terminal of the input interface CN1 and the IN pin of the step-down chip U1, and its other end is grounded together with the second terminal of the input interface CN1. One end of the voltage regulator module (2) is connected to the SW pin of the step-down chip U1 and the fourth terminal of the output interface CN2, and its other end is grounded together with the fifth terminal of the output interface CN2. The input terminal of the weighting module (3) is connected to the third terminal of the input interface CN1, and its output terminal is connected to the FB terminal of the step-down chip U1.

2. The unidirectional fan DC voltage regulation circuit according to claim 1, characterized in that, It also includes a voltage divider module (4), which includes resistors R1 and R3. One end of resistor R1 is connected to the IN pin of the filter module (1) and the step-down chip U1, and the other end is connected to the EN pin of resistor R3 and the step-down chip U1. The other end of resistor R3 is grounded.

3. The unidirectional fan DC voltage regulation circuit according to claim 1, characterized in that, The filtering module (1) includes capacitor C1 and capacitor C5. One end of capacitor C1 is connected to the first terminal of the input interface CN1 and the IN pin of the step-down chip U1, and the other end of it is grounded together with the second terminal of the input interface CN1. Capacitor C5 is connected in parallel with capacitor C1.

4. The unidirectional fan DC voltage regulation circuit according to claim 1, characterized in that, The weighting module (3) includes a diode D1, an RC unit (31) and a voltage divider unit (32). The positive terminal of the diode D1 is connected to the third terminal of the input interface CN1, and its negative terminal is connected to the RC unit (31). The other end of the RC unit (31) is connected to the voltage divider unit (32), and the voltage divider unit (32) is also connected to the FB pin of the step-down chip U1.

5. The unidirectional fan DC voltage regulation circuit according to claim 1, characterized in that, The voltage regulator module (2) includes an inductor L1, a capacitor C4, a capacitor C2 and a capacitor C3. One end of the inductor L1 is connected to the SW pin of the step-down chip U1, and the other end is connected to the capacitors C4, C2 and C3 and the fourth terminal of the output interface CN2. The other end of the capacitor C4 is connected to the weighting module (3), and the other ends of the capacitors C2 and C3 are grounded.

6. The unidirectional fan DC voltage regulation circuit according to claim 1, characterized in that, It also includes a resistor R2, one end of which is connected to the FSW pin of the step-down chip U1, and the other end is grounded.

7. The unidirectional fan DC voltage regulation circuit according to claim 1, characterized in that, It also includes an output RC module (5), which includes a resistor R6 and a capacitor C6. One end of the resistor R6 is connected to the voltage regulator module (2) and the fourth terminal of the output interface CN2, and the other end is grounded. The capacitor C6 is connected in parallel with the resistor R6.

8. The unidirectional fan DC voltage regulation circuit according to claim 4, characterized in that, The RC unit (31) includes a resistor R7, a capacitor C7 and a capacitor C8. One end of the resistor R7 is connected to the negative terminal of the diode D1, and the other end is connected to the capacitor C7, the capacitor C8 and the voltage divider unit (32). The other ends of the capacitors C7 and C8 are grounded together.

9. The unidirectional fan DC voltage regulation circuit according to claim 4, characterized in that, The voltage divider unit (32) includes resistors R8, R5A, R5B and R4. One end of resistor R8 is connected to the RC unit (31), and the other end is connected to the FB pin of the step-down chip U1, resistor R5A, resistor R5B and resistor R4 respectively. The other end of resistor R4 is connected to the voltage regulator module (2), and the other ends of resistors R5A and R5B are grounded.

10. A unidirectional fan, characterized in that, Includes the unidirectional fan DC voltage regulation circuit as described in any one of claims 1-9.

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