Fan speed regulation circuit, fan device and power supply equipment

Abstract

The utility model discloses a fan speed regulation circuit, a fan device and power supply equipment, the fan speed regulation circuit comprises an energy storage unit, a comparison unit, a charging loop unit and a discharging loop unit, a first input end of the comparison unit inputs reference voltage, a second input end of the comparison unit is connected with the energy storage unit, and the comparison unit is used for comparing the reference voltage with the voltage of the energy storage unit; the control signal is used for controlling the rotating speed of the fan; when the control signal is at a high level, the reference voltage is a first voltage, and when the control signal is at a low level, the reference voltage is a second voltage, and the first voltage is greater than the second voltage. The charging loop unit is connected with the energy storage unit, the output end of the comparison unit is connected with the charging loop unit, and the charging loop unit is used for charging the energy storage unit when the control signal is high level. The discharging loop unit is connected with the energy storage unit, the output end of the comparison unit is connected with the discharging loop unit, and the charging loop unit is used for discharging the energy storage unit when the control signal is low level.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of switching power supply, in particular to a fan speed regulation circuit, a fan device and a power supply equipment. BACKGROUND

[0002] A direct current speed regulation fan generally adjusts the fan speed by adjusting the duty cycle of the fan PWM signal. After sampling the temperature using an MCU, the fan PWM signal is adjusted according to the temperature change, so as to adjust the fan speed and achieve the purpose of heat dissipation. However, in the related art, in order to realize temperature sampling and adjust the fan PWM signal, an MCU is required, and the circuit cost is high. CONTENT OF THE INVENTION

[0003] The present application aims to provide a fan speed regulation circuit, a fan device and a power supply equipment, which can reduce the cost of the fan speed regulation circuit.

[0004] In a first aspect, an embodiment of the present application provides a fan speed regulation circuit, comprising:

[0005] an energy storage unit;

[0006] a comparison unit, a first input end of the comparison unit inputs a reference voltage, a second input end of the comparison unit is connected to the energy storage unit, the comparison unit is configured to compare the reference voltage with the voltage of the energy storage unit and output a control signal, the control signal is configured to control the speed of the fan; when the control signal is at a high level, the reference voltage is a first voltage, and when the control signal is at a low level, the reference voltage is a second voltage, the first voltage being greater than the second voltage;

[0007] a charging loop unit, the charging loop unit being connected to the energy storage unit, an output end of the comparison unit being connected to the charging loop unit, the charging loop unit being configured to charge the energy storage unit when the control signal is at the high level;

[0008] a discharging loop unit, the discharging loop unit being connected to the energy storage unit, the output end of the comparison unit being connected to the discharging loop unit, the charging loop unit being configured to discharge the energy storage unit when the control signal is at the low level, the discharging speed of the discharging loop unit changing according to the temperature change of a target area, the higher the temperature of the target area, the faster the discharging speed of the discharging loop unit.

[0009] According to some embodiments of the present application, the charging loop unit comprises:

[0010] a first resistor, a first end of the first resistor being connected to the output end of the comparison unit;

[0011] a first diode, an anode of the first diode being connected to the second end of the first resistor, a cathode of the first diode being connected to the energy storage unit.

[0012] According to some embodiments of the present application, the discharge loop unit comprises:

[0013] a second resistor, a first end of the second resistor being connected to the output end of the comparison unit, the second resistor being a negative temperature coefficient thermistor;

[0014] a second diode, a cathode of the second diode being connected to the second end of the second resistor, an anode of the second diode being connected to the energy storage unit.

[0015] According to some embodiments of the present application, the comparison unit comprises:

[0016] a comparator, a non-inverting input end of the comparator being inputted with a reference voltage, an inverting input end of the comparator being connected to the energy storage unit.

[0017] According to some embodiments of the present application, the comparison unit further comprises:

[0018] a third resistor, a first end of the third resistor being connected to a power supply end, a second end of the third resistor being connected to the non-inverting input end of the comparator;

[0019] a fourth resistor, a first end of the fourth resistor being connected to the second end of the third resistor, a second end of the fourth resistor being grounded.

[0020] According to some embodiments of the present application, the comparison unit further comprises:

[0021] a fifth resistor, a first end of the fifth resistor being connected to an output end of the comparator, a second end of the fifth resistor being connected to the non-inverting input end of the comparator.

[0022] According to some embodiments of the present application, the energy storage unit comprises:

[0023] a capacitor, a first end of the capacitor being connected to the inverting input end of the comparison unit, the first end of the capacitor being connected to the charging loop unit, the first end of the capacitor being connected to the discharge loop unit, a second end of the capacitor being grounded.

[0024] In a second aspect, embodiments of the present application provide a fan device, comprising the fan speed regulation circuit as described above.

[0025] In a third aspect, embodiments of the present application provide a power supply device, comprising the fan device as described above.

[0026] In the embodiment of the application, when the comparison unit outputs a high level, the charging circuit unit charges the energy storage unit, and the comparison unit compares the voltage of the energy storage unit with the first voltage. When the voltage of the energy storage unit is greater than the first voltage, the comparison unit outputs a low level. When the comparison unit outputs a low level, the discharging circuit unit discharges the energy storage unit, and the comparison unit outputs a high level until the voltage of the energy storage unit is less than the second voltage. Since the higher the temperature of the target area, the faster the discharging speed of the discharging circuit unit, the less the time of maintaining the low level, the greater the duty cycle of the control signal, the lower the temperature of the target area, and the smaller the duty cycle of the control signal, so as to realize the speed regulation of the fan. The fan speed regulation circuit of the embodiment of the application has a simple circuit structure, and the adopted components have a low price, thereby reducing the cost.

[0027] Additional aspects and advantages of the application will be made apparent by the following description and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0028] The application will be further described below in conjunction with the drawings and embodiments, in which:

[0029] Figure 1 The circuit diagram of the embodiment of the fan speed regulation circuit provided by the application is shown in the following figure;

[0030] Figure 2 The schematic diagram of the control signal in the embodiment of the fan speed regulation circuit provided by the application is shown in the following figure. DETAILED DESCRIPTION

[0031] The embodiments of the application are described in detail below, and examples of the embodiments are shown in the drawings, in which the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are used only for explaining the application, and cannot be understood as a limitation of the application.

[0032] In the description of the application, it should be understood that the orientation description, such as the indication of the orientation or position relationship, for example, up, down, etc., is based on the orientation or position relationship shown in the drawings, and is only for the purpose of facilitating the description of the application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the application.

[0033] In the description of the application, multiple refers to two or more. If there is a description of first, second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0034] In the description of the present application, the words such as setting, installing, connecting and the like should be understood in a broad sense unless otherwise explicitly limited, and the specific meanings of the words in the present application can be determined by the skilled in the art in combination with the specific content of the technical solutions.

[0035] The following refers to Figures 1 to 2 A fan speed regulation circuit, a fan device and a power supply device according to an embodiment of the present application are described.

[0036] An embodiment of the present application provides a fan speed regulation circuit, as shown in the accompanying drawings, comprising: Figure 1

[0037] An embodiment of the present application provides a fan speed regulation circuit, comprising:

[0038] An energy storage unit;

[0039] A comparison unit, a first input end of the comparison unit inputs a reference voltage, a second input end of the comparison unit is connected to the energy storage unit, the comparison unit is used to compare the reference voltage with the voltage of the energy storage unit and output a control signal, the control signal is used to control the rotation speed of the fan; when the control signal is at a high level, the reference voltage is a first voltage, and when the control signal is at a low level, the reference voltage is a second voltage, the first voltage being greater than the second voltage;

[0040] A charging loop unit, the charging loop unit is connected to the energy storage unit, an output end of the comparison unit is connected to the charging loop unit, and the charging loop unit is used to charge the energy storage unit when the control signal is at the high level;

[0041] A discharging loop unit, the discharging loop unit is connected to the energy storage unit, the output end of the comparison unit is connected to the discharging loop unit, and the discharging loop unit is used to discharge the energy storage unit when the control signal is at the low level, the discharging speed of the discharging loop unit changing according to the temperature change of a target area, the higher the temperature of the target area, the faster the discharging speed of the discharging loop unit.

[0042] In an embodiment of the present application, when the comparison unit outputs a high level, the charging loop unit charges the energy storage unit, the comparison unit compares the voltage of the energy storage unit with the first voltage, and when the voltage of the energy storage unit is greater than the first voltage, the comparison unit outputs a low level, and the output control signal is a PWM signal. As shown in the accompanying drawings, Figure 2 Figure 2 ​​The duty cycle of the control signal and the relationship of the charging and discharging process of the energy storage unit are shown, wherein V(R4_H) is the first voltage and V(R4_L) is the second voltage. When the output of the comparison unit is low, the discharging loop unit discharges the energy storage unit until the voltage of the energy storage unit is less than the second voltage, and the output of the comparison unit is high. Since the higher the temperature of the target area, the faster the discharging speed of the discharging loop unit, the less the time of maintaining low level, the greater the duty cycle of the control signal, the lower the temperature of the target area, and the smaller the duty cycle of the control signal, so as to realize the speed regulation of the fan. The fan speed regulation circuit of the embodiment of the application has a simple circuit structure, and the adopted components have a low price, thereby reducing the cost.

[0043] In some embodiments of the application, as shown in Figure 1 The charging loop unit comprises:

[0044] A first resistor R2, a first end of the first resistor R2 is connected to the output of the comparison unit;

[0045] A first diode D2, an anode of the first diode D2 is connected to a second end of the first resistor R2, and a cathode of the first diode D2 is connected to the energy storage unit.

[0046] In the embodiment, when the control signal of the output of the comparison unit is high, the first diode D2 is turned on, and the output of the comparison unit charges the energy storage unit through the first resistor R2 and the first diode D2. When the control signal of the output of the comparison unit is low, the first diode D2 is cut off.

[0047] In some embodiments of the application, as shown in Figure 1 The discharging loop unit comprises:

[0048] A second resistor R1, a first end of the second resistor R1 is connected to the output of the comparison unit, and the second resistor R1 is a negative temperature coefficient thermistor;

[0049] A second diode D1, a cathode of the second diode D1 is connected to a second end of the second resistor R1, and an anode of the second diode D1 is connected to the energy storage unit.

[0050] In the embodiment, when the control signal of the output of the comparison unit is low, the second diode D1 is turned on, and the energy storage unit discharges through the second diode D1 and the second resistor R1. When the control signal of the output of the comparison unit is high, the second diode D1 is cut off. Since the second resistor R1 is a negative temperature coefficient thermistor, it is used for detecting the temperature of the target area, that is, the resistance of the second resistor R1 changes with the temperature of the target area. The higher the temperature of the target area, the smaller the resistance of the second resistor R1, and the faster the discharging speed of the discharging loop unit, so the time of maintaining low level is less, the duty cycle of the control signal is greater, and the speed regulation of the fan is realized.

[0051] In some embodiments of the application, as shown in Figure 1 The comparison unit comprises:

[0052] a comparator U1, an inverting input terminal of the comparator U1 being connected to the energy storage unit;

[0053] a third resistor R5, a first terminal of the third resistor R5 being connected to the power supply terminal, and a second terminal of the third resistor R5 being connected to a non-inverting input terminal of the comparator U1;

[0054] a fourth resistor R4, a first terminal of the fourth resistor R4 being connected to the second terminal of the third resistor R5, and a second terminal of the fourth resistor R4 being grounded.

[0055] a fifth resistor R3, a first terminal of the fifth resistor R3 being connected to an output terminal of the comparator U1, and a second terminal of the fifth resistor R3 being connected to the non-inverting input terminal of the comparator U1.

[0056] In the present embodiment, when the comparator U1 outputs a high level, the voltage of the fourth resistor R4 is the first voltage, and the first voltage is:

[0057]

[0058] wherein V(R4_H) is the first voltage, VCC is the voltage provided by the power supply terminal, Ri3 is the resistance value of the fifth resistor R3, Ri4 is the resistance value of the fourth resistor R4, and Ri5 is the resistance value of the third resistor R5.

[0059] When the comparator U1 outputs a low level, the voltage of the fourth resistor R4 is the second voltage, and the second voltage is:

[0060]

[0061] wherein V(R4_L) is the second voltage, VCC is the voltage provided by the power supply terminal, Ri3 is the resistance value of the fifth resistor R3, Ri4 is the resistance value of the fourth resistor R4, and Ri5 is the resistance value of the third resistor R5.

[0062] As can be seen from the above formula, the first voltage is greater than the second voltage. The reference voltage input to the non-inverting input terminal of the comparator U1 is the voltage of the fourth resistor R4, and thus when the comparator U1 outputs a high level, the reference voltage input to the non-inverting input terminal of the comparator U1 is the first voltage. When the comparator U1 outputs a low level, the reference voltage input to the non-inverting input terminal of the comparator U1 is the second voltage.

[0063] In some embodiments of the application, as shown in Figure 1 The energy storage unit comprises:

[0064] The first end of the capacitor C1 is connected to the inverting input end of the comparison unit, the first end of the capacitor C1 is connected to the charging loop unit, the first end of the capacitor C1 is connected to the discharging loop unit, and the second end of the capacitor C1 is grounded.

[0065] In the embodiment, the capacitor C1 stores energy to complete the charging and discharging process.

[0066] In addition, the embodiment of the present application provides a fan device, which comprises the fan speed regulation circuit as described above.

[0067] The fan device provided by the embodiment of the present application can realize the processes realized by the circuit embodiments and achieve the same beneficial effects. To avoid repetition, details are not described herein.

[0068] In addition, the embodiment of the present application provides a power supply device, which comprises the fan device as described above.

[0069] The power supply device provided by the embodiment of the present application can realize the processes realized by the circuit embodiments and achieve the same beneficial effects. To avoid repetition, details are not described herein.

[0070] The embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the present application.

Claims

1. A fan speed regulation circuit, characterized by, The fan speed regulating circuit comprises: a storage unit; a comparison unit, a first input end of the comparison unit inputs a reference voltage, a second input end of the comparison unit is connected to the storage unit, the comparison unit is used for comparing the reference voltage with a voltage of the storage unit and outputting a control signal, the control signal is used for controlling a rotating speed of a fan, when the control signal is at a high level, the reference voltage is a first voltage, when the control signal is at a low level, the reference voltage is a second voltage, the first voltage is greater than the second voltage; a charging loop unit, the charging loop unit is connected to the storage unit, an output end of the comparison unit is connected to the charging loop unit, the charging loop unit is used for charging the storage unit when the control signal is at the high level; a discharging loop unit, the discharging loop unit is connected to the storage unit, the output end of the comparison unit is connected to the discharging loop unit, the charging loop unit is used for discharging the storage unit when the control signal is at the low level, a discharging speed of the discharging loop unit changes according to a temperature change of a target area, the higher the temperature of the target area is, the faster the discharging speed of the discharging loop unit is.

2. The fan speed regulation circuit of claim 1, wherein, The charging loop unit comprises: a first resistor, a first end of the first resistor is connected to the output end of the comparison unit; a first diode, an anode of the first diode is connected to a second end of the first resistor, a cathode of the first diode is connected to the storage unit.

3. The fan speed regulation circuit of claim 1, wherein, The discharging loop unit comprises: a second resistor, a first end of the second resistor is connected to the output end of the comparison unit, the second resistor is a negative temperature coefficient thermistor; a second diode, a cathode of the second diode is connected to a second end of the second resistor, an anode of the second diode is connected to the storage unit.

4. The fan speed regulation circuit of claim 1, wherein, The comparison unit comprises: a comparator, a non-inverting input end of the comparator inputs the reference voltage, an inverting input end of the comparator is connected to the storage unit.

5. The fan speed regulation circuit of claim 4, wherein, The comparison unit further comprises: a third resistor, a first end of the third resistor is connected to a power supply end, a second end of the third resistor is connected to the non-inverting input end of the comparator; a fourth resistor, a first end of the fourth resistor is connected to the second end of the third resistor, a second end of the fourth resistor is grounded; a fifth resistor, a first end of the fifth resistor is connected to an output end of the comparator, a second end of the fifth resistor is connected to the non-inverting input end of the comparator.

6. The fan speed regulation circuit of claim 1, wherein, The storage unit comprises: a capacitor, a first end of the capacitor is connected to the inverting input end of the comparison unit, a first end of the capacitor is connected to the charging loop unit, a first end of the capacitor is connected to the discharging loop unit, a second end of the capacitor is grounded.

7. A fan arrangement, characterized by The fan device comprises the fan speed regulating circuit according to any one of claims 1 to 6.

8. A power supply device characterized by comprising: The fan device comprises the fan speed regulating circuit according to claim 7.

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