A fan control system and method for PC power supply

Abstract

The present invention provides a fan control system for a PC power supply, comprising a main power supply circuit, an auxiliary power supply circuit, a control module, a temperature detection device and a fan, wherein the output ends of the main power supply circuit, the auxiliary power supply circuit and the temperature detection device are respectively connected to the input end of the control module, the output end of the control module is connected to the fan, and the output voltage of the auxiliary power supply circuit is higher than the output voltage of the main power supply circuit. The present invention also provides a fan control method for a PC power supply. The beneficial effect of the present invention is that when the PC power supply works under harsh conditions of high temperature and full load, the power supply of the fan circuit is switched to that provided by the auxiliary power supply circuit, the voltage of the fan can be further increased, and the rotation speed is also accelerated, which is conducive to cooling the components.

Description

Technical Field

[0001] The invention relates to a fan control system, and in particular to a fan control system and method for a PC power supply. Background Art

[0002] The fan control circuit power supply of the existing PC power supply has only one power supply module, which uses the main output 12V power supply, and controls the fan voltage according to the temperature detected by the temperature detection device. Since the maximum voltage of the fan is limited to 12V, if it works in a high temperature environment, although the temperature detected by the temperature detection device has increased, the working voltage of the fan is limited to 12V and cannot continue to increase, resulting in a significant increase in the temperature of the internal components, thereby affecting the service life of the entire PC power supply. Summary of the invention

[0003] In order to solve the problems in the prior art, the present invention provides a fan control system and method for a PC power supply.

[0004] The present invention provides a fan control system for a PC power supply, comprising a main power supply circuit, an auxiliary power supply circuit, a control module, a temperature detection device and a fan, wherein the output ends of the main power supply circuit, the auxiliary power supply circuit and the temperature detection device are respectively connected to the input end of the control module, the output end of the control module is connected to the fan, and the output voltage of the auxiliary power supply circuit is higher than the output voltage of the main power supply circuit.

[0005] As a further improvement of the present invention, the auxiliary power supply circuit includes a rectifier diode D3, an electrolytic capacitor C3, a capacitor C4, a photocoupler IC1:B, a resistor R4, a transistor Q4, a voltage regulator diode ZD2 and an electrolytic capacitor C2, wherein the anode of the rectifier diode D3 is connected to the input voltage, the cathode of the rectifier diode D3 is connected to the collector of the transistor Q4, the positive electrode of the electrolytic capacitor C3 and the cathode of the rectifier diode D3 are connected to point A, the negative electrode of the electrolytic capacitor C3 is grounded, one end of the capacitor C4 is connected to the cathode of the rectifier diode D3, and the The other end of the capacitor C4 is grounded, the cathode of the voltage zener diode ZD2 is connected to the base of the transistor Q4, the anode of the voltage zener diode ZD2 is grounded, the pin 4 of the photoelectric coupler IC1:B is connected to the cathode of the rectifier diode D3, the pin 3 of the photoelectric coupler IC1:B is connected to one end of the resistor R4, the other end of the resistor R4 is connected to the cathode of the voltage zener diode ZD2 and the point B between the base of the transistor Q4, the positive electrode of the electrolytic capacitor C2 is connected to the emitter of the transistor Q4 at point C, and the negative electrode of the electrolytic capacitor C2 is grounded.

[0006] As a further improvement of the present invention, the anode of the rectifier diode D3 is connected to a 5VSB auxiliary winding. The pulse voltage obtained from the 5VSB auxiliary winding is rectified by the rectifier diode D3 and filtered by the electrolytic capacitor C3 and the capacitor C4 to obtain a DC voltage of 13V-20V at A. When the external PS / ON power-on signal is received, the photoelectric coupler IC1:B is turned on, and the DC voltage at A is clamped by the photoelectric coupler IC1:B→resistor R4→Zener diode ZD2 to obtain a DC voltage of 12-16V at B. After adjustment and amplification by the transistor Q4, a DC voltage of 12-16V is finally obtained at C as the auxiliary power supply voltage of the fan.

[0007] As a further improvement of the present invention, the main power supply circuit provides 12V power supply.

[0008] As a further improvement of the present invention, the control module is connected to a current detection module.

[0009] The present invention also provides a fan control method for a PC power supply, wherein the fan control system of the PC power supply as described above performs the following process:

[0010] In the first stage, when the output power of the PC power supply is less than 20% of the rated power, the fan will not start and it will enter the energy-saving and noise-reduction mode;

[0011] In the second stage, the main power supply circuit is used to output 12V power supply. The output power of the PC power supply is 20%-50% of the rated power. The fan starts to operate with a minimum voltage of 3.8V and a maximum voltage of no more than 5V. After operation, the fan voltage increases with the temperature of the internal environment. The maximum fan voltage in this stage is limited to 8V.

[0012] In the third stage, the main power supply circuit is used to output 12V power supply, the output power of the PC power supply is 50%-100% of the rated power, and the fan operates at a voltage of 8V-12V;

[0013] In the fourth stage, when the ambient temperature reaches above the upper limit, the auxiliary power supply circuit is enabled to supply power. The auxiliary power supply circuit outputs 12-16V power supply, and the fan voltage will further increase until it reaches the maximum operating voltage of the fan, allowing the PC power supply to operate in a high temperature environment and also controlling the temperature of the components within a safe range.

[0014] As a further improvement of the present invention, the upper limit is 35 degrees.

[0015] The beneficial effect of the present invention is that, through the above scheme, when the PC power supply works under the harsh conditions of high temperature and full load, the power supply of the fan circuit is switched to be provided by the auxiliary power supply circuit, the voltage of the fan can be further increased, and the speed is also increased accordingly, which is beneficial to the cooling of components. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a schematic diagram of a fan control system for a PC power supply.

[0017] Figure 2 The invention discloses a circuit diagram of a fan control system for a PC power supply.

[0018] Figure 3 The invention discloses a circuit diagram of an auxiliary power supply circuit of a fan control system of a PC power supply.

[0019] Figure 4 The present invention is a schematic diagram of a fan control method for a PC power supply.

[0020] Figure 5 The present invention is a flow chart of a fan control method for a PC power supply. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0022] like Figures 1 to 5 As shown, a fan control system of a PC power supply includes a main power supply circuit 1, an auxiliary power supply circuit 2, a control module 3, a temperature detection device 4 and a fan 5, wherein the output ends of the main power supply circuit 1, the auxiliary power supply circuit 2 and the temperature detection device 4 are respectively connected to the input end of the control module 3, the output end of the control module 3 is connected to the fan 5, and the output voltage of the auxiliary power supply circuit 2 is higher than the output voltage of the main power supply circuit 1.

[0023] like Figures 1 to 5As shown, the auxiliary power supply circuit 2 includes a rectifier diode D3, an electrolytic capacitor C3, a capacitor C4, a photocoupler IC1:B, a resistor R4, a transistor Q4, a voltage regulator diode ZD2 and an electrolytic capacitor C2, wherein the anode of the rectifier diode D3 is connected to the input voltage, the cathode of the rectifier diode D3 is connected to the collector of the transistor Q4, the positive electrode of the electrolytic capacitor C3 and the cathode of the rectifier diode D3 are connected to point A, the negative electrode of the electrolytic capacitor C3 is grounded, one end of the capacitor C4 is connected to the cathode of the rectifier diode D3, and the capacitor C4 The other end of the voltage regulator diode ZD2 is grounded, the cathode of the voltage regulator diode ZD2 is connected to the base of the transistor Q4, the anode of the voltage regulator diode ZD2 is grounded, the pin 4 of the photoelectric coupler IC1:B is connected to the cathode of the rectifier diode D3, the pin 3 of the photoelectric coupler IC1:B is connected to one end of the resistor R4, the other end of the resistor R4 is connected to the cathode of the voltage regulator diode ZD2 and the point B between the base of the transistor Q4, the positive electrode of the electrolytic capacitor C2 is connected to the emitter of the transistor Q4 at point C, and the negative electrode of the electrolytic capacitor C2 is grounded.

[0024] like Figures 1 to 5 As shown, the anode of the rectifier diode D3 is connected to the 5VSB auxiliary winding. The pulse voltage obtained from the 5VSB auxiliary winding is rectified by the rectifier diode D3, filtered by the electrolytic capacitor C3 and the capacitor C4, and a DC voltage of 13V-20V is obtained at A. When the external PS / ON power-on signal is received, the photoelectric coupler IC1:B is turned on, and the DC voltage at A is clamped by the photoelectric coupler IC1:B→resistor R4→Zener diode ZD2, and a DC voltage of 12-16V is obtained at B. After adjustment and amplification by the transistor Q4, a DC voltage of 12-16V is finally obtained at C as the auxiliary power supply voltage of the fan 5.

[0025] like Figures 1 to 5 As shown, the main power supply circuit 1 provides 12V power supply.

[0026] like Figures 1 to 5 As shown, the control module 3 is connected to a current detection module 6 .

[0027] like Figures 1 to 5 As shown, a fan control method for a PC power supply is performed by using the fan control system of the PC power supply as described in any one of the above-mentioned steps:

[0028] (P0-P1) In the first stage, when the output power of the PC power supply is less than 20% of the rated power, fan 5 does not start and enters the energy-saving and noise reduction mode;

[0029] (P1-P2) In the second stage, the main power supply circuit 1 is used to output 12V power supply. The output power of the PC power supply is 20%-50% of the rated power. The fan 5 starts to operate with a minimum voltage of 3.8V and a maximum voltage of no more than 5V. After operation, the fan voltage increases with the temperature of the internal environment. The maximum fan voltage in this stage is limited to 8V.

[0030] (P2-P3) In the third stage, the main power supply circuit 1 is used to output 12V power supply, the output power of the PC power supply is 50%-100% of the rated power, and the fan 5 operates at a voltage of 8V-12V;

[0031] (P3-P4) In the fourth stage, when the ambient temperature reaches above 35 degrees, the auxiliary power supply circuit 2 is enabled to supply power. The auxiliary power supply circuit 2 outputs 12-16V power supply, and the fan voltage will further increase until it reaches the maximum operating voltage of the fan 5, which can allow the PC power supply to operate in a high temperature environment and can also control the temperature of the components within a safe range.

[0032] like Figures 1 to 5 As shown, the ambient temperature can be detected by the temperature detection device 4 , and the main power supply circuit 1 and the auxiliary power supply circuit 2 can be switched by the control module 3 .

[0033] The present invention provides a fan control system and method for a PC power supply, which realizes the secondary control of the fan of the PC power supply. An auxiliary power supply circuit 2 is added on the basis of the original 12V power supply, an auxiliary winding is drawn out from the 5VSB winding, and a DC voltage higher than 12V is obtained through rectification, filtering and voltage stabilization as the auxiliary power supply voltage of the fan control circuit. In this way, when the PC POWER works under the harsh conditions of high temperature and full load, the power supply of the fan circuit is switched to that provided by the auxiliary power supply circuit 2, so the voltage of the fan 5 can be further improved, and the rotation speed is also accelerated, which is beneficial to the cooling of components.

[0034] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A fan control system for a PC power supply, characterized in that: The invention comprises a main power supply circuit, an auxiliary power supply circuit, a control module, a temperature detection device and a fan. The output ends of the main power supply circuit, the auxiliary power supply circuit and the temperature detection device are respectively connected to the input end of the control module. The output end of the control module is connected to the fan. The output voltage of the auxiliary power supply circuit is higher than the output voltage of the main power supply circuit. The auxiliary power supply circuit comprises a rectifier diode D3, an electrolytic capacitor C3, a capacitor C4, an optocoupler IC1:B, a resistor R4, a transistor Q4, a voltage regulator diode ZD2 and an electrolytic capacitor C 2, wherein the anode of the rectifier diode D3 is connected to the input voltage, the cathode of the rectifier diode D3 is connected to the collector of the transistor Q4, the positive electrode of the electrolytic capacitor C3 and the cathode of the rectifier diode D3 are connected to point A, the negative electrode of the electrolytic capacitor C3 is grounded, one end of the capacitor C4 is connected to the cathode of the rectifier diode D3, the other end of the capacitor C4 is grounded, the cathode of the voltage regulator diode ZD2 is connected to the base of the transistor Q4, the anode of the voltage regulator diode ZD2 is grounded, and the photoelectric coupler I Pin 4 of C1:B is connected to the cathode of the rectifier diode D3, pin 3 of the photocoupler IC1:B is connected to one end of the resistor R4, the other end of the resistor R4 is connected to the cathode of the voltage stabilizing diode ZD2 and point B between the base of the transistor Q4, the positive electrode of the electrolytic capacitor C2 and the emitter of the transistor Q4 are connected to point C, the negative electrode of the electrolytic capacitor C2 is grounded, the anode of the rectifier diode D3 is connected to the 5VSB auxiliary winding, and the pulse voltage obtained from the 5VSB auxiliary winding is transmitted through the rectifier diode D3 is rectified and filtered by electrolytic capacitor C3 and capacitor C4 to obtain a DC voltage of 13V-20V at A. When an external PS / ON power-on signal is received, the photoelectric coupler IC1:B is turned on, and the DC voltage at A is clamped by the photoelectric coupler IC1:B→resistor R4→zener diode ZD2 to obtain a DC voltage of 12-16V at B. After adjustment and amplification by transistor Q4, a DC voltage of 12-16V is finally obtained at C as the auxiliary power supply voltage of the fan. The control module is connected to a current detection module.

2. The fan control system of a PC power supply according to claim 1, characterized in that: The main power supply circuit provides 12V power supply.

3. A fan control method for a PC power supply, characterized in that: The fan control system of the PC power supply according to any one of claims 1 to 2 performs the following process: In the first stage, when the output power of the PC power supply is less than 20% of the rated power, the fan will not start and it will enter the energy-saving and noise-reduction mode; In the second stage, the main power supply circuit is used to output 12V power supply. The output power of the PC power supply is 20%-50% of the rated power. The fan starts to operate with a minimum voltage of 3.8V and a maximum voltage of no more than 5V. After operation, the fan voltage increases with the temperature of the internal environment. The maximum fan voltage in this stage is limited to 8V. In the third stage, the main power supply circuit is used to output 12V power supply, the output power of the PC power supply is 50%-100% of the rated power, and the fan operates at a voltage of 8V-12V; In the fourth stage, when the ambient temperature reaches above the upper limit, the auxiliary power supply circuit is enabled to supply power. The auxiliary power supply circuit outputs 12-16V power supply, and the fan voltage will further increase until it reaches the maximum operating voltage of the fan, allowing the PC power supply to operate in a high temperature environment and also controlling the temperature of the components within a safe range.

4. The fan control method of a PC power supply according to claim 3, characterized in that: The upper limit is 35 degrees.

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