Fan failure protector

Abstract

The utility model relates to a fan failure protector, which comprises a controller, a pulse signal detection circuit, a logic gate circuit and a switch trigger circuit, the controller comprises a temperature threshold state signal and a system switch signal, the pulse signal detection circuit receives a frequency generator signal transmitted by a fan, and the logic gate circuit is connected with the switch trigger circuit. The logic gate circuit receives signals of the pulse signal detection circuit and the temperature threshold state signal, the switch trigger circuit receives signals transmitted by the logic gate circuit and transmits the signals to the controller to provide system switch signals, and the controller can be in bidirectional connection with the module to be cooled through a bus, so that the reliability is high, and the reliability is high. Protectiveness is high, and popularization is convenient.

Description

Technical Field

[0001] The utility model relates to the field of electronic appliances, in particular to a fan failure protector. Background Art

[0002] In traditional electrical appliances, fans are the most important part of heat dissipation and play a big role in high-temperature equipment that needs cooling. In most of the previously running equipment, if the fan is damaged, the cooled device will heat up seriously, thus affecting the stability and service life of the equipment, and even causing damage to the equipment. At the same time, in the current application field, the heat dissipation module, as an independent equipment unit, lacks a protection mechanism for the fan in the event of damage. Therefore, it is necessary to design a circuit technology that protects when the fan fails, that is, to protect the cooled equipment or device from damage when the fan is damaged, without affecting the life of the equipment or device. Utility Model Content

[0003] In view of this, it is necessary to provide a fan failure protector with high reliability, low loss and strong protection.

[0004] A fan failure protector is suitable for protecting a heat dissipation device, comprising a controller, a pulse signal detection circuit, a logic gate circuit, and a switch trigger circuit. The controller has a temperature threshold status signal and a system switch signal. The pulse signal detection circuit receives a frequency generator signal transmitted by the fan. One end of the logic gate circuit is connected to the pulse signal detection circuit, and the other end is connected to the controller to receive the temperature threshold status signal. The switch trigger circuit receives the signal transmitted by the logic gate circuit and transmits it to the controller to provide a system switch signal. The controller can be bidirectionally connected to the heat dissipation module through a bus.

[0005] Furthermore, in an electrical appliance with an intelligent fan control function, the temperature threshold status signal in the controller is a temperature control threshold, which is used to determine whether to start the cooling system. When it is detected that the temperature of the cooling module is higher than the temperature control threshold, the controller outputs a logic low level. When it is detected that the temperature of the cooling module is lower than the temperature control threshold, the controller outputs a logic high level. The system switch signal in the controller is responsible for the power on and power off functions of the electrical system.

[0006] Furthermore, the frequency generator signal is a continuous pulse signal, representing the speed of the fan. The higher the fan speed, the higher the frequency of the pulse signal. When the fan works normally, the pulse signal detection circuit receives the continuous pulse signal and outputs a logic high level. When the fan does not work normally, the fan speed is reduced to 0, and the pulse signal detection circuit receives a non-pulse signal and outputs a logic low level.

[0007] Furthermore, one end of the logic gate circuit inputs the signal of the pulse signal detection circuit, and the other end receives the temperature threshold state signal. When the temperature threshold state signal is a logic high level and the pulse signal detection circuit outputs a logic high level, the logic gate circuit outputs a logic high level; when the temperature threshold state signal is opposite to the level signal of the pulse signal detection circuit, the logic gate circuit outputs a logic low level.

[0008] Furthermore, when the input end of the switch trigger circuit receives a logic high level signal from the logic gate circuit, the output end remains unchanged; when the input end of the switch trigger circuit receives a logic low level signal from the logic gate circuit, a logic low level or a low pulse is output. At this time, the system switch signal receives a logic low level signal and starts to shut down.

[0009] Furthermore, the pulse signal detection circuit adopts a chip U1, which has a trigger pin TRI, a threshold pin THR, a disable pin DIS, a reset pin RST, a connection pin CON, a power pin VCC, an output pin OUT and a ground pin GND. The trigger pin TRI is connected to the fan pulse signal for starting. The threshold pin THR is used to set the required threshold. When the threshold is reached, a high-level pulse signal is output through the output pin OUT. The connection pin CON is grounded through a capacitor C2. The threshold pin THR is connected to a transistor D1 and then grounded. The emitter of the transistor D1 is connected to the threshold pin THR, the base and the fan pulse signal FG are connected to the trigger pin TRI together, and the collector is grounded. The disable pin DIS is connected to the power supply VCC through a resistor R1, and is grounded through a capacitor C1 at the front end of the resistor R1. The disable pin DIS is further short-circuited with the threshold pin THR at the front end of the resistor and capacitor.

[0010] The above-mentioned fan failure protector includes a controller, a pulse signal detection circuit, a logic gate circuit, and a switch trigger circuit. The controller includes a temperature threshold state signal and a system switch signal. In an electrical appliance with an intelligent fan control function, the temperature threshold state signal is a temperature control threshold. Whether to start the cooling system is determined by the temperature. The pulse signal detection circuit receives a frequency generator signal transmitted by the fan. When the fan works normally, it receives a continuous pulse signal and outputs a high level; when the fan does not work normally, it receives a non-pulse signal and outputs a low level. One end of the logic gate circuit is connected to the pulse signal detection circuit, and the other end is connected to the temperature threshold state signal. The switch trigger circuit receives the signal transmitted by the logic gate circuit and transmits it to the controller to provide a system switch signal. The controller can be bidirectionally connected to the heat dissipated module through a bus, which greatly improves the reliability of three-wire and four-wire fans with speed feedback function, protects the heat dissipated equipment or devices from damage, and can achieve the effect of the protection circuit technology when the fan fails. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The utility model is a schematic diagram of a fan failure protector structure provided by an embodiment of the utility model.

[0012] Figure 2 The utility model is a circuit principle diagram of a fan failure protector provided in an embodiment of the utility model.

[0013] In the attached drawings: 11, fan, 12, pulse signal detection circuit, 13, logic gate circuit, 14, switch trigger circuit, 16, controller, 17, heat dissipation module. DETAILED DESCRIPTION

[0014] The present invention will be described in detail below with reference to specific embodiments and accompanying drawings.

[0015] See also Figure 1 and Figure 2 , showing a fan failure protector provided by an embodiment of the present invention, including a controller 16, a pulse signal detection circuit 12, a logic gate circuit 13, a switch trigger circuit 14 and a heat dissipation module 15, the controller 16 has a temperature threshold state signal and a system switch signal, the pulse signal detection circuit 12 receives a frequency generator signal transmitted by the fan, one end of the logic gate circuit 13 is connected to the pulse signal detection circuit 12, and the other end is connected to the controller 16 to receive the temperature threshold state signal, the switch trigger circuit 14 receives the signal transmitted by the logic gate circuit 13 and transmits it to the controller to provide a system switch signal to the controller 16, and the controller 16 is bidirectionally connected to the heat dissipation module 17 through a bus.

[0016] Specifically, in an appliance with an intelligent fan control function, the temperature threshold state signal in the controller 16 is a temperature control threshold, which is used to determine whether to start the cooling system. When the temperature of the cooling module 17 is detected to be higher than the threshold, the controller 16 outputs a logic low level. When the temperature of the cooling module 17 is detected to be lower than the temperature control threshold, the controller outputs a logic high level. The system switch signal in the controller 16 is responsible for the power-on and power-off functions of the electrical system, protecting the cooling device or device from damage and increasing the use time of the device. The controller 16 can be a conventional MCU, EC, CPU or PMIC, etc.

[0017] Specifically, the frequency generator signal is a continuous pulse signal, such as Figure 1 and Figure 2 As shown in FG, it represents the rotation speed of the fan. The higher the fan rotation speed, the higher the frequency of the pulse signal. When the fan works normally, the pulse signal detection circuit 12 receives continuous pulse signals and outputs a logic high level. When the fan does not work normally, the fan rotation speed is reduced to 0, the pulse signal detection circuit 12 receives a non-pulse signal and outputs a logic low level, and transmits the low level signal to the logic gate circuit 13.

[0018] Specifically, one end of the logic gate circuit 13 inputs the signal of the pulse signal detection circuit 12, and the other end receives the temperature threshold status signal in the controller 16. When the temperature threshold status signal is a logic high level and the pulse signal detection circuit 12 outputs a logic high level, the logic gate circuit 13 outputs a logic high level; when the temperature threshold status signal is opposite to the level signal of the pulse signal detection circuit 12, the logic gate circuit 13 outputs a logic low level.

[0019] Specifically, when the input end of the switch trigger circuit 14 receives the logic high level signal of the logic gate circuit 13, the output end remains unchanged, and when the input end of the switch trigger circuit 14 receives the logic low level signal of the logic gate circuit 13, it outputs a logic low level or a low pulse, and at this time, the system switch signal receives the logic low level signal and starts to shut down, thereby protecting the electrical equipment from damage. The switch trigger circuit 14 can be a pulse trigger circuit or a low level trigger circuit, etc.

[0020] As shown in the figure, when the fan fails, the protector has five modules: a controller 16, a pulse signal detection circuit 12, a logic gate circuit 13, a switch trigger circuit 14 and a heat dissipation module 17. The controller 16 can output a temperature threshold status signal to the logic gate circuit 13, the controller 16 can receive a system switch signal from the switch trigger circuit 14, the pulse signal detection circuit 12 receives a frequency generator signal transmitted by the fan 11, the switch trigger circuit 14 receives a signal transmitted by the logic gate circuit 13, and the heat dissipation module 17 transmits information via a bidirectional connection with the controller 16 via a bus.

[0021] Specifically, Figure 2 As shown, the chip U1 has a trigger pin TRI, a threshold pin THR, a disable pin DIS, a reset pin RST, a connection pin CON, a power pin VCC, an output pin OUT and a ground pin GND. The trigger pin TRI is connected to the fan pulse signal for starting. When the trigger pin TRI receives a low-level signal (for example, less than 1 / 3 VCC), the timing starts. The threshold pin THR is used to set the required threshold. When the threshold is reached, a high-level pulse signal is output through the output pin OUT. The connection pin CON is grounded through a capacitor C2. The threshold pin THR is connected to a transistor D1 and then grounded. The emitter of the transistor D1 is connected to the threshold pin THR, the base and the fan pulse signal FG are connected to the trigger pin TRI together, and the collector is grounded. The disable pin DIS is connected to the power supply VCC through the resistor R1, and is grounded through the capacitor C1 at the front end of the resistor R1. The disable pin DIS is further short-circuited with the threshold pin THR at the front end of the resistor and capacitor. The output pin OUT is connected to the pulse input pin B of the logic gate circuit U1.

[0022] The above-mentioned fan failure protector includes a controller 16, a pulse signal detection circuit 12, a logic gate circuit 13, a switch trigger circuit 14 and a heat dissipation module 17. The controller 16 includes a temperature threshold state signal and a system switch signal. The pulse signal detection circuit 12 receives a frequency generator signal transmitted by the fan. One end of the logic gate circuit 13 is connected to the pulse signal detection circuit 12, and the other end is connected to the temperature threshold state signal. The switch trigger circuit 14 receives the signal transmitted by the logic gate circuit 13 and transmits it to the controller to provide a system switch signal. The heat dissipation module 17 is bidirectionally connected to the controller 16 via a bus, has high reliability, and is simple to connect. It meets the demand for increasing the service life of electrical equipment and greatly protects the electrical equipment from damage.

[0023] It should be noted that the present invention is not limited to the above-mentioned embodiments. According to the creative spirit of the present invention, technical personnel in this field can also make other changes. These changes made according to the creative spirit of the present invention should be included in the scope of protection required by the present invention.

Claims

1. A fan failure protector, characterized in that: It includes a controller, a pulse signal detection circuit, a logic gate circuit, and a switch trigger circuit. The controller has a temperature threshold status signal and a system switch signal. The pulse signal detection circuit receives a frequency generator signal transmitted by a fan. One end of the logic gate circuit is connected to the pulse signal detection circuit, and the other end is connected to the controller to receive the temperature threshold status signal. The switch trigger circuit receives the signal transmitted by the logic gate circuit and transmits it to the controller to provide a system switch signal to the controller. The controller is bidirectionally connected to the heat dissipation module through a bus.

2. A fan failure protector as claimed in claim 1, characterized in that: In an electrical appliance with an intelligent fan control function, the temperature threshold status signal in the controller is a temperature control threshold, which is used to determine whether to start the cooling system. When it is detected that the temperature of the cooling module is higher than the temperature control threshold, the controller outputs a logic low level. When it is detected that the temperature of the cooling module is lower than the temperature control threshold, the controller outputs a logic high level. The system switch signal in the controller is responsible for the power on and power off functions of the electrical system.

3. A fan failure protector as claimed in claim 1, characterized in that: The frequency generator signal is a continuous pulse signal, representing the speed of the fan. The higher the fan speed, the higher the frequency of the pulse signal. When the fan works normally, the pulse signal detection circuit receives the continuous pulse signal and outputs a logic high level. When the fan does not work normally, the fan speed is reduced to 0, and the pulse signal detection circuit receives a non-pulse signal and outputs a logic low level.

4. A fan failure protector as claimed in claim 1, characterized in that: The logic gate circuit inputs the signal of the pulse signal detection circuit at one end, and receives the temperature threshold state signal at the other end. When the temperature threshold state signal is a logic high level and the pulse signal detection circuit outputs a logic high level, the logic gate circuit outputs a logic high level; when the temperature threshold state signal is opposite to the level signal of the pulse signal detection circuit, the logic gate circuit outputs a logic low level.

5. A fan failure protector as claimed in claim 1, characterized in that: When the input end of the switch trigger circuit receives a logic high level signal from the logic gate circuit, the output end remains unchanged. When the input end of the switch trigger circuit receives a logic low level signal from the logic gate circuit, a logic low level or a low pulse is output. At this time, the system switch signal receives a logic low level signal and starts to shut down.

6. A fan failure protector as claimed in claim 1, characterized in that: The pulse signal detection circuit adopts chip U1, which has a trigger pin TRI, a threshold pin THR, a disable pin DIS, a reset pin RST, a connection pin CON, a power pin VCC, an output pin OUT and a ground pin GND. The trigger pin TRI is connected to the fan pulse signal for starting. The threshold pin THR is used to set the required threshold. When the threshold is reached, a high-level pulse signal is output through the output pin OUT. The connection pin CON is grounded through a capacitor C2. The threshold pin THR is connected to a transistor D1 and then grounded. The emitter of the transistor D1 is connected to the threshold pin THR, the base and the fan pulse signal FG are connected to the trigger pin TRI together, and the collector is grounded. The disable pin DIS is connected to the power supply VCC through a resistor R1, and is grounded through a capacitor C1 at the front end of the resistor R1. The disable pin DIS is further short-circuited with the threshold pin THR at the front end of the resistor and capacitor.

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