Space-saving PWM (Pulse Width Modulation) speed regulation fan

Abstract

The utility model relates to the technical field of fan speed regulation, and discloses a space-saving PWM (Pulse Width Modulation) speed regulation fan which comprises a fan driving chip U1 connected with a power supply, an MOS (Metal Oxide Semiconductor) tube Q1 for receiving PWM signals and a filter circuit, and a D pole of the MOS tube Q1 is connected with a pin 4 of the fan driving chip U1; through the design that the MOS tube is connected with the PWM signal output end and the bias resistor is arranged between the MOS tube and the PWM signal output end, when the PWM signal is suspended, the MOS tube Q1 processes the conduction state, when the PWM signal is zero, the MOS tube Q1 is cut off, the fan does not work, when the PWM signal is input to the duty ratio, the output of the MOS tube Q1 is also in the duty ratio, and the output is used for controlling the rotating speed of the fan. When the power supply duty ratio is adopted, the rotating speed fan is compatible with speed regulation, so that the fan not only has a PWM signal speed regulation function, but also is compatible with a control mode that a client uses power supply PWM speed regulation, the occupied space of a speed regulation device is small, and the fan is suitable for PWM control of a small fan.

Description

Technical Field

[0001] The utility model relates to the technical field of fan speed regulation, in particular to a space-saving PWM speed-regulated fan. Background Technique

[0002] The speed regulation of the fan includes mechanical speed regulation and electronic speed regulation. The mechanical speed regulation mainly realizes the adjustment of the rotation speed by adjusting the mechanical structure or load of the fan, and the electronic speed regulation realizes the adjustment of the rotation speed by changing the voltage, current or frequency of the electric fan motor, which has higher flexibility and accuracy.

[0003] After retrieval, the patent with the application number CN202121611798.5 discloses a speed-regulated fan structure based on the PWM control mode, including a housing, a motor mounting seat, a fan blade mounting seat and a metal mesh cover. A driving motor is installed inside the motor mounting seat. Four connecting rods are fixedly connected at equal distances in a ring with the center of the motor mounting seat as the origin on the back of the motor mounting seat. The four connecting rods are respectively fixedly connected to the back of the housing and close to the four corners. The output end of the driving motor is fixedly connected with a connecting head. A connecting sleeve is fixedly connected to the middle of the fan blade mounting seat. The connecting sleeve is detachably fixedly connected to the top of the connecting head. The edges of the fan blade mounting seat are fixedly connected with fan blades at equal distances in a ring with the center of the fan blade mounting seat as the origin. The metal mesh cover is detachably inserted into the front of the housing; the utility model is convenient for disassembling and cleaning the fan blade mounting seat, and solves the problems of dust splashing and low efficiency during the cleaning process.

[0004] Currently, conventional PWM speed regulation chips are generally expensive and have a large volume after encapsulation, which is not suitable for the PWM control of small fans. Therefore, we need to propose a space-saving PWM speed-regulated fan. Content of the Utility Model

[0005] The purpose of the utility model is to provide a space-saving PWM speed-regulated fan. By connecting the PWM signal output terminal through a MOS tube and setting a bias resistor between the MOS tube and the WM signal output terminal, when the PWM signal is suspended, the MOS tube Q1 is in a conducting state. When the PWM signal is 0, the MOS tube Q1 is cut off and the fan does not work. When the PWM signal is input to the duty cycle, the output of the MOS tube Q1 also shows a duty cycle, and the output is used to control the rotation speed of the fan. When using the power duty cycle, the rotation speed of the fan is also compatible with speed regulation, so that the fan not only has the PWM signal speed regulation function, but also is compatible with the control method of using the power PWM speed regulation by the client. The speed regulation device occupies a small space and is suitable for the PWM control of small fans, so as to solve the problems raised in the above background technique.

[0006] To achieve the above object, the present utility model provides the following technical solution: A space-saving PWM speed-regulated fan, comprising a fan drive chip U1 connected to a power supply, a MOS transistor Q1 receiving a PWM signal, and a filter circuit connected to the D pole of the MOS transistor Q1. The D pole of the MOS transistor Q1 is connected to the 4th pin of the fan drive chip U1, and the filter circuit is connected between the 1st pin and the 4th pin of the fan drive chip U1;

[0007] It further includes a controller I / O interface DS3 and a motor terminal JP2 connected to the fan drive chip U1. The 2nd pin of the fan drive chip U1 is connected to the 1st pin of the motor terminal JP2, the 3rd pin of the fan drive chip U1 is connected to the 2nd pin of the motor terminal JP2, the 6th pin of the fan drive chip U1 is connected to the 4th pin of the controller I / O interface DS3, and the 7th pin of the fan drive chip U1 is connected to the 3rd pin of the controller I / O interface DS3.

[0008] Preferably, the filter circuit includes a series-connected resistor R1 and capacitor C1. One end of the resistor R1 is connected to a resistor R2. A resistor R4 is connected to the G pole of the MOS transistor Q1, and a resistor R3 is connected to the S pole of the MOS transistor Q1. The connection terminals of the resistors R2, R3, and R4 receive the PWM signal.

[0009] Preferably, an inductor L1 is connected between the 2nd pin and the 3rd pin of the fan drive chip U1.

[0010] Preferably, a resistor R40 is connected to the connection terminal between the 6th pin of the fan drive chip U1 and the 4th pin of the controller I / O interface DS3, and a resistor R50 is connected to the connection terminal between the 7th pin of the fan drive chip U1 and the 3rd pin of the controller I / O interface DS3. The connection terminals of the resistors R40 and R50 are connected to the power supply.

[0011] Preferably, it further includes a resistor R10, a diode D1, and a capacitor C10 connected to form a closed loop. The connection terminal of the resistor R10 and the capacitor C10 is connected to the power supply, and the connection terminal of the diode D1 and the capacitor C10 is grounded.

[0012] Compared with the prior art, the beneficial effects of the present utility model are:

[0013] In the present utility model, the PWM signal output terminal is connected through a MOS transistor, and a bias resistor is provided between the MOS transistor and the WM signal output terminal. When the PWM signal is floating, the MOS transistor Q1 is in a conducting state. When the PWM signal is 0, the MOS transistor Q1 is cut off and the fan does not work. When the PWM signal is input to a duty cycle, the output of the MOS transistor Q1 also shows a duty cycle, and the output is used to control the rotational speed of the fan. When using the power supply duty cycle for speed regulation, the rotational speed of the fan is also compatible with speed regulation. This makes the fan not only have the function of PWM signal speed regulation, but also be compatible with the control method of using the power supply PWM speed regulation by the client. The speed regulation device occupies a small space and is suitable for the PWM control of small fans. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic connection diagram of the PWM signal, the MOS transistor Q1 and the fan drive chip U1 of the present utility model;

[0015] Figure 2 It is a schematic connection diagram of the fan drive chip U1 of the present utility model with the controller I / O interface DS3 and the motor connection terminal JP2. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the scope of protection of the present utility model.

[0017] Please refer to Figure 1-2 , the present utility model provides a technical solution: a fan with PWM speed regulation that saves space, including a fan drive chip U1 connected to a power supply, a MOS transistor Q1 that receives a PWM signal, and a filter circuit connected to the D pole of the MOS transistor Q1. The D pole of the MOS transistor Q1 is connected to the 4th pin of the fan drive chip U1, and the filter circuit is connected between the 1st pin and the 4th pin of the fan drive chip U1;

[0018] When the PWM signal is floating, the resistors R2 and R3 are the bias resistors of the MOS transistor Q1, making the MOS transistor Q1 in a conducting state. When the PWM signal is 0, the MOS transistor Q1 is cut off and the fan does not work. When the PWM signal is input to a duty cycle, the output of the MOS transistor Q1 also shows a duty cycle, and the output is used to control the rotational speed of the fan.

[0019] When the customer does not use duty cycle speed regulation and uses the power supply duty cycle, the rotational speed of the fan is also compatible with speed regulation.

[0020] It further includes a controller I / O interface DS3 and a motor terminal JP2 connected to the fan drive chip U1. The 2nd pin of the fan drive chip U1 is connected to the 1st pin of the motor terminal JP2, the 3rd pin of the fan drive chip U1 is connected to the 2nd pin of the motor terminal JP2, the 6th pin of the fan drive chip U1 is connected to the 4th pin of the controller I / O interface DS3, and the 7th pin of the fan drive chip U1 is connected to the 3rd pin of the controller I / O interface DS3.

[0021] The 4th, 5th, and 8th pins of the fan drive chip U1 are all grounded, and the 5th pin of the controller I / O interface DS3 is connected to the power supply.

[0022] The filter circuit includes a resistor R1 and a capacitor C1 connected in series. One end of the resistor R1 is connected to a resistor R2. A resistor R4 is connected to the G pole of the MOS transistor Q1, and a resistor R3 is connected to the S pole of the MOS transistor Q1. The connection terminals of the resistors R2, R3, and R4 receive the PWM signal.

[0023] An inductor L1 is connected between the 2nd and 3rd pins of the fan drive chip U1.

[0024] A resistor R40 is connected to the connection terminal between the 6th pin of the fan drive chip U1 and the 4th pin of the controller I / O interface DS3, and a resistor R50 is connected to the connection terminal between the 7th pin of the fan drive chip U1 and the 3rd pin of the controller I / O interface DS3. The connection terminals of the resistors R40 and R50 are connected to the power supply.

[0025] It further includes a resistor R10, a diode D1, and a capacitor C10 connected to form a closed loop. The connection terminal of the resistor R10 and the capacitor C10 is connected to the power supply, and the connection terminal of the diode D1 and the capacitor C10 is grounded.

[0026] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A space-saving PWM speed-controlled fan, characterized in that: It includes a fan drive chip U1 connected to a power supply, a MOS transistor Q1 receiving a PWM signal, and a filter circuit connected to the D pole of the MOS transistor Q1. The D pole of the MOS transistor Q1 is connected to the 4th pin of the fan drive chip U1, and the filter circuit is connected between the 1st pin and the 4th pin of the fan drive chip U1; It also includes a controller I / O interface DS3 and a motor terminal block JP2 connected to the fan drive chip U1. The 2nd pin of the fan drive chip U1 is connected to the 1st pin of the motor terminal block JP2, the 3rd pin of the fan drive chip U1 is connected to the 2nd pin of the motor terminal block JP2, the 6th pin of the fan drive chip U1 is connected to the 4th pin of the controller I / O interface DS3, and the 7th pin of the fan drive chip U1 is connected to the 3rd pin of the controller I / O interface DS3.

2. The space-saving PWM speed-regulated fan according to claim 1, characterized in that: The filter circuit includes a series-connected resistor R1 and capacitor C1. One end of the resistor R1 is connected to a resistor R2. A resistor R4 is connected to the G pole of the MOS transistor Q1, and a resistor R3 is connected to the S pole of the MOS transistor Q1. The connection terminals of the resistors R2, R3, and R4 receive the PWM signal.

3. The PWM speed control fan for saving space according to claim 1, characterized in that: An inductor L1 is connected between the 2nd pin and the 3rd pin of the fan drive chip U1.

4. The PWM speed control fan for saving space according to claim 1, characterized in that: A resistor R40 is connected to the connection terminal of the 6th pin of the fan drive chip U1 and the 4th pin of the controller I / O interface DS3, and a resistor R50 is connected to the connection terminal of the 7th pin of the fan drive chip U1 and the 3rd pin of the controller I / O interface DS3. The connection terminals of the resistor R40 and the resistor R50 are connected to the power supply.

5. A space-saving PWM speed-controlled fan according to claim 1, characterized in that: It also includes a resistor R10, a diode D1, and a capacitor C10 connected in a closed loop. The connection terminal of the resistor R10 and the capacitor C10 is connected to the power supply, and the connection terminal of the diode D1 and the capacitor C10 is grounded.

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