A fan status detection device and method

Abstract

The present invention provides a fan state detection device and method in the field of fan state detection technology. The device includes a fan access state detection circuit, a fan operation state detection circuit, and a fan operation state indication circuit; the fan access state detection circuit includes an optical coupler K1, a capacitor C1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a transistor Q1, a diode VD1, a diode VD2, and a fuse F1; the optical coupler K1 is connected to the fan operation state indication circuit, the capacitor C1, the resistor R1, the transistor Q1, and the resistor R4; the base of the transistor Q1 is connected to the resistor R2, and the emitter is connected to the input end of the diode VD1; the input end of the diode VD2 is connected to the output end of the diode VD1 and the resistor R3, and the output end is connected to the resistor R2, the resistor R3, and the fuse F1; one end of the fan operation state detection circuit is connected to the fan operation state indication circuit, and the other end is connected to the fuse F1. The advantage of the present invention is that it can realize automatic detection of the operation state of the fan.

Description

Technical Field

[0001] The present invention relates to the technical field of fan status detection, and in particular to a fan status detection device and method. Background Art

[0002] A fan is a device used for heat dissipation. Various devices that generate a lot of heat during operation need to use fans for heat dissipation, such as power cabinets, chemical distribution cabinets and other equipment. When the fan cannot operate normally, it will directly affect the stability of the corresponding equipment. Therefore, it is necessary to grasp the operating status of the fan in real time.

[0003] However, traditionally, the operating status of the fan can only be judged by the naked eye, or by the human body's sense of whether the air is coming out. When the fan is installed in a hidden location, it will be difficult to quickly determine the operating status. When there are a large number of fans, regular manual inspections are required, which is not only inefficient but also consumes a lot of manpower costs.

[0004] Therefore, how to provide a fan status detection device and method to automatically detect the operating status of the fan has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a fan status detection device and method to realize automatic detection of the operating status of the fan.

[0006] In a first aspect, the present invention provides a fan state detection device, comprising a fan access state detection circuit, a fan operation state detection circuit and a fan operation state indication circuit;

[0007] The fan access status detection circuit includes an optical coupler K1, a capacitor C1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a transistor Q1, a diode VD1, a diode VD2 and a fuse F1;

[0008] The emitter of the optocoupler K1 is connected to the fan operation status indication circuit, the positive input terminal is connected to the capacitor C1, the resistor R1 and the collector of the transistor Q1, and the negative input terminal is connected to the capacitor C1, the resistor R1 and the resistor R4; the base of the transistor Q1 is connected to the resistor R2, and the emitter is connected to the input end of the diode VD1; the input end of the diode VD2 is connected to the output end of the diode VD1 and the resistor R3, and the output end is connected to the resistor R2, the resistor R3 and the fuse F1; one end of the fan operation status detection circuit is connected to the fan operation status indication circuit, and the other end is connected to the fuse F1.

[0009] Further, the fan operation state detection circuit includes a MOS tube Q4, a diode D2, a diode D4, a resistor R11, a resistor R13, a resistor R14, a resistor R15, a capacitor C5 and a connection terminal J1;

[0010] The input end of the diode D2 is connected to the fan operation status indication circuit, and the output end is connected to the drain of the MOS tube Q4; the gate of the MOS tube Q4 is connected to the resistor R14, the capacitor C5, the output end of the diode D4, the resistor R13 and the fan operation status indication circuit, and the source is connected to the resistor R14, the capacitor C5, the input end of the diode D4 and the resistor R15 and grounded; the pin 1 of the terminal J1 is connected to the fuse F1, the pin 2 is connected to the resistor R11 and the resistor R13, and the pin 3 is grounded.

[0011] Furthermore, the fan operation status indication circuit includes a MOS tube Q2, a MOS tube Q3, a resistor R5, a resistor R8, a resistor R9, a capacitor C2 and a light emitting diode D1;

[0012] The input end of the light emitting diode D1 is connected to the resistor R8 and the resistor R9 respectively, and the output end is grounded; one end of the capacitor C2 is connected to the gate of the MOS tube Q2 and the fan operation status detection circuit, and the other end is grounded;

[0013] The gate of the MOS tube Q3 is connected to the resistor R5 and the fan operation status detection circuit, the drain is connected to the resistor R8, the source is connected to the resistor R5, the source of the MOS tube Q2 and the fan access status detection circuit; the drain of the MOS tube Q2 is connected to the resistor R9.

[0014] Furthermore, the resistor R3 is an adjustable resistor, and the transistor Q1 is a PNP transistor.

[0015] Furthermore, the MOS tube Q4 is an NMOS tube.

[0016] Furthermore, the MOS transistor Q2 and the MOS transistor Q3 are both PMOS transistors.

[0017] In a second aspect, the present invention provides a method for detecting a fan status, comprising the following steps:

[0018] Step S10: When the fan is not connected to the terminal J1, the terminal J1 is in an open circuit state, the emitter of the optocoupler K1 outputs a low level to the fan operation status indication circuit, and the light-emitting diode D1 is off;

[0019] Step S20, connecting the fan's FAN+ pin, FAN_RD pin, and FAN- pin to pins 1, 2, and 3 of the wiring terminal J1, respectively, and connecting the diode VD1, the diode VD2, the fuse F1, and the wiring terminal J1 to form a loop;

[0020] Step S30, transistor Q1 is turned on under the voltage drop of diodes VD1 and VD2, thereby driving the positive electrode and the negative electrode of the input end of the optocoupler K1 to be turned on, and then the collector and emitter of the optocoupler K1 are turned on to output a high level to the fan operation status indication circuit;

[0021] Step S40: When the fan is running normally, the FAN_RD pin outputs a low level to make the light emitting diode D1 light up green; when the fan is blocked, the FAN_RD pin outputs a high level to make the light emitting diode D1 light up red;

[0022] Step S50: Indicating the operating status of the fan based on the lighting status of the light emitting diode D1.

[0023] Furthermore, the step S10 is specifically as follows:

[0024] When the fan is not connected to the terminal J1, the terminal J1 is in an open circuit state and no loop is formed. The diodes VD1 and VD2 are in a cut-off state. The voltage drop between the base and emitter of the transistor Q1 is insufficient to conduct, and the optocoupler K1 is also in a cut-off state. The emitter of the optocoupler K1 outputs a low level to the fan operation status indication circuit, and the light-emitting diode D1 is not lit.

[0025] Further, in the step S40, when the fan operates normally, the FAN_RD pin outputs a low level to make the light emitting diode D1 light green:

[0026] When the fan operates normally, a low level is output to the terminal J1 through the FAN_RD pin and transmitted to the gate of the MOS tube Q2. The source of the MOS tube Q2 is a high level and the gate is a low level, and then a high level is output through the drain, turning on the light-emitting device on the right side of the light-emitting diode D1 to light up the green light.

[0027] Furthermore, in the step S40, when the fan is blocked, the FAN_RD pin outputs a high level to make the light emitting diode D1 light up red. Specifically:

[0028] When the fan is blocked, a high level is output to the terminal J1 through the FAN_RD pin and transmitted to the gate of the MOS tube Q4. The drain and gate of the MOS tube Q4 are both at high levels and cut off, and then a low level is output to the gate of the MOS tube Q3. The source of the MOS tube Q3 is at a high level and the gate is at a low level, and then a high level is output through the drain, turning on the light-emitting device on the left side of the light-emitting diode D1 to light up the red light.

[0029] The advantages of the present invention are:

[0030] 1. By setting a fan access state detection circuit, a fan operation state detection circuit and a fan operation state indication circuit, when the fan operation state detection circuit terminal J1 is not connected to the fan, the diodes VD1 and VD2 of the fan access state detection circuit are in a cut-off state, so that the fan access state detection circuit outputs a low level to the fan operation state indication circuit, and the light-emitting diode D1 is not lit; when the fan is connected to the fan, if the fan is running normally, a low level is output to the pin 2 of the terminal J1 through the FAN_RD pin, so that the light-emitting diode D1 lights up green; if the fan is blocked, a high level is output to the pin 2 of the terminal J1 through the FAN_RD pin, so that the light-emitting diode D1 lights up red. Based on the lighting state of the light-emitting diode D1, the three operating states of the fan can be indicated, that is, the operating state of the fan is automatically detected, and cheap devices are used, the circuit cost is low, and it is easy to implement.

[0031] 2. By setting an optocoupler K1 in the fan access status detection circuit to isolate the high and low voltages, the incompatibility problem under different voltage working conditions can be solved.

[0032] 3. By setting diodes VD1 and VD2, when PVCC and GND_IN are reversely connected, diodes VD1 and VD2 will be in the cut-off state, thus playing a role in reverse connection protection.

[0033] 4. By setting the fuse F1, when pins 1 and 3 of the terminal J1 are short-circuited, the fuse F1 will be in a high resistance state for a short time, cutting off the current in the circuit and playing an overcurrent protection role. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention will be further described below in conjunction with embodiments with reference to the accompanying drawings.

[0035] Figure 1 The invention discloses a circuit diagram of a fan status detection device.

[0036] Figure 2 The present invention is a circuit diagram of a fan access status detection circuit.

[0037] Figure 3 The invention discloses a circuit diagram of a fan operating state detection circuit.

[0038] Figure 4 The invention discloses a circuit diagram of a fan operation status indicating circuit.

[0039] Figure 5 The present invention is a flow chart of a method for detecting a fan status. DETAILED DESCRIPTION

[0040] The technical solution in the embodiment of the present application has the following overall idea: a fan access status detection circuit, a fan operation status detection circuit and a fan operation status indication circuit are set. When the terminal J1 is not connected to the fan, the fan access status detection circuit outputs a low level to the fan operation status indication circuit, and the light-emitting diode D1 is not lit; when the terminal J1 is connected to the fan, if the fan operates normally, a low level is output to pin 2 of the terminal J1 to make the light-emitting diode D1 light up green; if the fan is blocked, a high level is output to pin 2 of the terminal J1 to make the light-emitting diode D1 light up red, so as to realize automatic detection of the operation status of the fan.

[0041] Please refer to Figures 1 to 5 As shown, a preferred embodiment of a fan state detection device of the present invention includes a fan access state detection circuit, a fan operation state detection circuit and a fan operation state indication circuit;

[0042] The fan access status detection circuit includes an optical coupler K1, a capacitor C1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a transistor Q1, a diode VD1, a diode VD2 and a fuse F1; the fuse F1 is a self-recovering fuse;

[0043] The emitter of the optocoupler K1 is connected to the fan operation status indication circuit, the positive input terminal is connected to the capacitor C1, the resistor R1 and the collector of the transistor Q1, and the negative input terminal is connected to the capacitor C1, the resistor R1 and the resistor R4; the base of the transistor Q1 is connected to the resistor R2, and the emitter is connected to the input end of the diode VD1; the input end of the diode VD2 is connected to the output end of the diode VD1 and the resistor R3, and the output end is connected to the resistor R2, the resistor R3 and the fuse F1; one end of the fan operation status detection circuit is connected to the fan operation status indication circuit, and the other end is connected to the fuse F1.

[0044] The fan operation status detection circuit includes a MOS tube Q4, a diode D2, a diode D4, a resistor R11, a resistor R13, a resistor R14, a resistor R15, a capacitor C5 and a wiring terminal J1; pins 1, 2, and 3 of the wiring terminal J1 are respectively used to connect the FAN+ pin, FAN_RD pin, and FAN- pin of the fan; the FAN+ pin is the positive electrode of the power supply, the FAN- pin is the negative electrode of the power supply, and the FAN_RD pin is the pin for the fan to output signals to the outside; only when pins 1 and 3 of the wiring terminal J1 are connected to the FAN+ pin and FAN- pin of the fan, the wiring terminal J1 is turned on to form a loop;

[0045] The input end of the diode D2 is connected to the fan operation status indication circuit, and the output end is connected to the drain of the MOS tube Q4; the gate of the MOS tube Q4 is connected to the resistor R14, the capacitor C5, the output end of the diode D4, the resistor R13 and the fan operation status indication circuit, and the source is connected to the resistor R14, the capacitor C5, the input end of the diode D4 and the resistor R15 and grounded; the pin 1 of the terminal J1 is connected to the fuse F1, the pin 2 is connected to the resistor R11 and the resistor R13, and the pin 3 is grounded.

[0046] The fan operation status indication circuit includes a MOS tube Q2, a MOS tube Q3, a resistor R5, a resistor R8, a resistor R9, a capacitor C2 and a light-emitting diode D1; the light-emitting device on the left side of the light-emitting diode D1 is used to emit red light, and the light-emitting device on the right side is used to emit green light;

[0047] The input end of the light emitting diode D1 is connected to the resistor R8 and the resistor R9 respectively, and the output end is grounded; one end of the capacitor C2 is connected to the gate of the MOS tube Q2 and the fan operation status detection circuit, and the other end is grounded;

[0048] The gate of the MOS tube Q3 is connected to the resistor R5 and the fan operation status detection circuit, the drain is connected to the resistor R8, the source is connected to the resistor R5, the source of the MOS tube Q2 and the fan access status detection circuit; the drain of the MOS tube Q2 is connected to the resistor R9.

[0049] The resistor R3 is an adjustable resistor, and the transistor Q1 is a PNP transistor.

[0050] The MOS tube Q4 is an NMOS tube.

[0051] The MOS transistor Q2 and the MOS transistor Q3 are both PMOS transistors.

[0052] A preferred embodiment of a fan status detection method of the present invention comprises the following steps:

[0053] Step S10: When the fan is not connected to the terminal J1, the terminal J1 is in an open circuit state, the emitter of the optocoupler K1 outputs a low level to the fan operation status indication circuit, and the light-emitting diode D1 is off;

[0054] Step S20, connecting the fan's FAN+ pin, FAN_RD pin, and FAN- pin to pins 1, 2, and 3 of the wiring terminal J1, respectively, and connecting the diode VD1, the diode VD2, the fuse F1, and the wiring terminal J1 to form a loop;

[0055] Step S30, transistor Q1 is turned on under the voltage drop of diodes VD1 and VD2, thereby driving the positive electrode and the negative electrode of the input end of the optocoupler K1 to be turned on, and then the collector and emitter of the optocoupler K1 are turned on to output a high level to the fan operation status indication circuit;

[0056] Step S40, when the fan is running normally, the FAN_RD pin outputs a low level to make the light-emitting diode D1 light up green; when the fan is stalled, the FAN_RD pin outputs a high level to make the light-emitting diode D1 light up red; the inside of the fan is an open-drain circuit. When working normally, the MOS tube in the fan short-circuits the FAN_RD signal to the ground, thereby pulling the voltage of the resistor R11 down to the ground. When the fan is stalled, the MOS tube is turned off, and the FAN_RD signal will be pulled up to a high level by the resistor R11;

[0057] Step S50: Indicating the operating status of the fan based on the lighting status of the light emitting diode D1.

[0058] The step S10 is specifically as follows:

[0059] When the fan is not connected to the terminal J1, the terminal J1 is in an open circuit state and no loop is formed. The diodes VD1 and VD2 are in a cut-off state. The voltage drop between the base and emitter of the transistor Q1 is insufficient to conduct, and the optocoupler K1 is also in a cut-off state. The emitter of the optocoupler K1 outputs a low level to the fan operation status indication circuit, and the light-emitting diode D1 is not lit.

[0060] In step S40, when the fan is running normally, the FAN_RD pin outputs a low level to make the light emitting diode D1 light green:

[0061] When the fan is running normally, a low level is output to pin 2 of terminal J1 through the FAN_RD pin, the level of TP3 is pulled down, and it is transmitted to the gate of MOS tube Q2. The source of MOS tube Q2 is a high level and the gate is a low level, and then a high level is output through the drain, turning on the light-emitting device on the right side of the light-emitting diode D1 to light up the green light.

[0062] In step S40, when the fan is blocked, the FAN_RD pin outputs a high level to make the light emitting diode D1 light up red. Specifically:

[0063] When the fan is blocked, a high level is output to pin 2 of the terminal J1 through the FAN_RD pin, the level of TP3 is pulled up and transmitted to the gate of the MOS tube Q4. The drain and gate of the MOS tube Q4 are both at high levels and cut off, and then a low level is output to the gate of the MOS tube Q3. The source of the MOS tube Q3 is at a high level and the gate is at a low level, and then a high level is output through the drain, turning on the light-emitting device on the left side of the light-emitting diode D1 to light up the red light.

[0064] In summary, the advantages of the present invention are:

[0065] 1. By setting a fan access state detection circuit, a fan operation state detection circuit and a fan operation state indication circuit, when the fan operation state detection circuit terminal J1 is not connected to the fan, the diodes VD1 and VD2 of the fan access state detection circuit are in a cut-off state, so that the fan access state detection circuit outputs a low level to the fan operation state indication circuit, and the light-emitting diode D1 is not lit; when the fan is connected to the fan, if the fan is running normally, a low level is output to the pin 2 of the terminal J1 through the FAN_RD pin, so that the light-emitting diode D1 lights up green; if the fan is blocked, a high level is output to the pin 2 of the terminal J1 through the FAN_RD pin, so that the light-emitting diode D1 lights up red. Based on the lighting state of the light-emitting diode D1, the three operating states of the fan can be indicated, that is, the operating state of the fan is automatically detected, and cheap devices are used, the circuit cost is low, and it is easy to implement.

[0066] 2. By setting an optocoupler K1 in the fan access status detection circuit to isolate the high and low voltages, the incompatibility problem under different voltage working conditions can be solved.

[0067] 3. By setting diodes VD1 and VD2, when PVCC and GND_IN are reversely connected, diodes VD1 and VD2 will be in the cut-off state, thus playing a role in reverse connection protection.

[0068] 4. By setting the fuse F1, when pins 1 and 3 of the terminal J1 are short-circuited, the fuse F1 will be in a high resistance state for a short time, cutting off the current in the circuit and playing an overcurrent protection role.

[0069] Although the specific implementation modes of the present invention are described above, those skilled in the art should understand that the specific implementation modes described are only illustrative and are not intended to limit the scope of the present invention. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A fan status detection device, Features: It includes a fan access status detection circuit, a fan operation status detection circuit and a fan operation status indication circuit; The fan access status detection circuit includes an optical coupler K1, a capacitor C1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a transistor Q1, a diode VD1, a diode VD2 and a fuse F1; The emitter of the optical coupler K1 is connected to the fan operation status indication circuit, the positive input terminal is connected to the capacitor C1, the resistor R1 and the collector of the transistor Q1, and the negative input terminal is connected to the capacitor C1, the resistor R1 and the resistor R4; the base of the transistor Q1 is connected to the resistor R2, and the emitter is connected to the input end of the diode VD1; the input end of the diode VD2 is connected to the output end of the diode VD1 and the resistor R3, and the output end is connected to the resistor R2, the resistor R3 and the fuse F1; one end of the fan operation status detection circuit is connected to the fan operation status indication circuit, and the other end is connected to the fuse F1; The fan operation status detection circuit includes a MOS tube Q4, a diode D2, a diode D4, a resistor R11, a resistor R13, a resistor R14, a resistor R15, a capacitor C5 and a wiring terminal J1; The input end of the diode D2 is connected to the fan operation status indication circuit, and the output end is connected to the drain of the MOS tube Q4; the gate of the MOS tube Q4 is connected to the resistor R14, the capacitor C5, the output end of the diode D4, the resistor R13 and the fan operation status indication circuit, and the source is connected to the resistor R14, the capacitor C5, the input end of the diode D4 and the resistor R15 and grounded; the pin 1 of the terminal J1 is connected to the fuse F1, the pin 2 is connected to the resistor R11 and the resistor R13, and the pin 3 is grounded.

2. A fan status detection device as claimed in claim 1, Features: The fan operation status indication circuit includes a MOS tube Q2, a MOS tube Q3, a resistor R5, a resistor R8, a resistor R9, a capacitor C2 and a light emitting diode D1; The input end of the light emitting diode D1 is connected to the resistor R8 and the resistor R9 respectively, and the output end is grounded; one end of the capacitor C2 is connected to the gate of the MOS tube Q2 and the fan operation status detection circuit, and the other end is grounded; The gate of the MOS tube Q3 is connected to the resistor R5 and the fan operation status detection circuit, the drain is connected to the resistor R8, the source is connected to the resistor R5, the source of the MOS tube Q2 and the fan access status detection circuit; the drain of the MOS tube Q2 is connected to the resistor R9.

3. A fan status detection device according to claim 1, Features: The resistor R3 is an adjustable resistor, and the transistor Q1 is a PNP transistor.

4. A fan status detection device according to claim 1, Features: The MOS tube Q4 is an NMOS tube.

5. A fan status detection device as claimed in claim 2, Features: The MOS transistor Q2 and the MOS transistor Q3 are both PMOS transistors.

6. A method for detecting fan status, Features: The method requires the use of a detection device as described in any one of claims 1 to 5, comprising the following steps: Step S10: When the fan is not connected to the terminal J1, the terminal J1 is in an open circuit state, the emitter of the optocoupler K1 outputs a low level to the fan operation status indication circuit, and the light-emitting diode D1 is off; Step S20, connecting the fan's FAN+ pin, FAN_RD pin, and FAN- pin to pins 1, 2, and 3 of the wiring terminal J1, respectively, and connecting the diode VD1, the diode VD2, the fuse F1, and the wiring terminal J1 to form a loop; Step S30, transistor Q1 is turned on under the voltage drop of diodes VD1 and VD2, thereby driving the positive electrode and the negative electrode of the input end of the optocoupler K1 to be turned on, and then the collector and emitter of the optocoupler K1 are turned on to output a high level to the fan operation status indication circuit; Step S40: When the fan is running normally, the FAN_RD pin outputs a low level to make the light emitting diode D1 light up green; when the fan is blocked, the FAN_RD pin outputs a high level to make the light emitting diode D1 light up red; Step S50: Indicating the operating status of the fan based on the lighting status of the light emitting diode D1.

7. A method for detecting a fan status as claimed in claim 6, Features: The step S10 is specifically as follows: When the fan is not connected to the terminal J1, the terminal J1 is in an open circuit state and no loop is formed. The diodes VD1 and VD2 are in a cut-off state. The voltage drop between the base and emitter of the transistor Q1 is insufficient to conduct, and the optocoupler K1 is also in a cut-off state. The emitter of the optocoupler K1 outputs a low level to the fan operation status indication circuit, and the light-emitting diode D1 is not lit.

8. A method for detecting a fan status as claimed in claim 6, Features: In step S40, when the fan is running normally, the FAN_RD pin outputs a low level to make the light emitting diode D1 light green: When the fan operates normally, a low level is output to the terminal J1 through the FAN_RD pin and transmitted to the gate of the MOS tube Q2. The source of the MOS tube Q2 is a high level and the gate is a low level, and then a high level is output through the drain, turning on the light-emitting device on the right side of the light-emitting diode D1 to light up the green light.

9. A method for detecting a fan status as claimed in claim 6, Features: In step S40, when the fan is blocked, the FAN_RD pin outputs a high level to make the light emitting diode D1 light up red. Specifically: When the fan is blocked, a high level is output to the terminal J1 through the FAN_RD pin and transmitted to the gate of the MOS tube Q4. The drain and gate of the MOS tube Q4 are both at high levels and cut off, and then a low level is output to the gate of the MOS tube Q3. The source of the MOS tube Q3 is at a high level and the gate is at a low level, and then a high level is output through the drain, turning on the light-emitting device on the left side of the light-emitting diode D1 to light up the red light.

Images