A fan control and fault feedback circuit

Abstract

The present invention discloses a fan control and fault feedback circuit, including a fan power supply, a fan drive module and a fault feedback module, wherein the fault feedback module includes a second diode, a second transistor, a fourth resistor and a fifth resistor, wherein the fourth resistor and the fifth resistor are connected in series and then connected in parallel with the fan power supply, and the fifth resistor is simultaneously connected in parallel to the GS port of the second transistor, the second diode and the second transistor are connected in series, and the prototype port of the second diode is connected to the IO port of the fault identification. The present invention only needs to add a transistor and a diode to a conventional control circuit to realize the feedback of the fault, and the cost is extremely low and no level conversion is required. If there are multiple faults that need to be integrated, they can be directly connected in parallel, and very few devices are used, no redundant power supply is required, and no multi-purpose chips are required.

Description

Technical Field

[0001] The present invention relates to the technical field of fan control circuits, and in particular to a fan control and fault feedback circuit. Background Art

[0002] The existing fan control circuit is generally driven by MOS. If a feedback loop is added on this basis, it is generally necessary to increase the number of terminals, add corresponding detection circuits to read faults, and also add corresponding level conversion to finally send to the IO port.

[0003] In summary, the prior art has two main disadvantages: 1. The number of fan interface pins increases.

[0004] 2. Add corresponding level detection chips and level conversion chips. If there are multiple faults, it is also necessary to add signal integration circuits. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a fan control and fault feedback circuit, which only needs to add a transistor and a diode to the conventional control circuit to realize fault feedback. The cost is extremely low and no level conversion is required. If there are multiple faults that need to be integrated, they can be directly connected in parallel. Very few devices are used, no redundant power supply is required, and no multiple chips are required.

[0006] In order to solve the above technical problems, the present invention provides a fan control and fault feedback circuit, including a fan power supply, a fan drive module and a fault feedback module, the fault feedback module including a second diode, a second transistor, a fourth resistor and a fifth resistor, the fourth resistor and the fifth resistor are connected in series and then connected in parallel with the fan power supply, the fifth resistor is also connected in parallel to the GS port of the second transistor, the second diode and the second transistor are connected in series, and the prototype port of the second diode is connected to the IO port of fault identification.

[0007] Furthermore, it comprises a fan operation indication module, the fan operation indication module comprises a third resistor and an indicator light, the third resistor and the indicator light are connected in series and then connected in parallel with the fan power supply.

[0008] Furthermore, the wind turbine driving module includes a first transistor, a gate driving resistor, a gate pull-down resistor, a gate capacitor and a freewheeling diode.

[0009] Further, the gate drive resistor is connected in series with the gate of the first transistor, the gate pull-down resistor is connected in parallel with the GS of the first transistor, the gate capacitor is connected in parallel with the GS of the first transistor, and the freewheeling diode is connected in parallel with the wind turbine power supply.

[0010] Furthermore, the first transistor and the second transistor are specifically MOS transistors, triodes or IGBTs.

[0011] Beneficial effects of the present invention: Compared with the prior art, the present invention uses very few devices, does not require redundant power supplies, does not require multiple chips, and can complete the following functions using only one MOS tube:

[0012] 1. Fault feedback can be realized normally;

[0013] 2. It can realize the integration of multiple fan fault signals and save IO ports;

[0014] 3. Faults will only be reported when the fan is powered on and running, and will not be reported when power is off;

[0015] 4. It can be connected to the controller IO port without using a level conversion chip. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a circuit diagram of the present invention.

[0017] Figure 2 It is a schematic diagram of the normal operation of the present invention (the right side is the internal circuit of the fan).

[0018] Figure 3 This is a schematic diagram of the present invention in which the power supply is normal and the fan is faulty (the right side is the internal circuit of the fan).

[0019] Figure 4 It is a schematic diagram of the fan stop state of the present invention (the right side is the internal circuit of the fan).

[0020] Figure 5 It is a schematic diagram of integrating multiple fault signals of the present invention into one fault signal (the right side is the internal circuit of the fan).

[0021] Explanation of the numbers in the figure: Q2, second diode; D2, second transistor; R4, fourth resistor; R5, fifth resistor; R3, third resistor; Q1, first transistor; R1, gate drive resistor; LED1, indicator light; R2, gate pull-down resistor; C1, gate capacitor; D1, freewheeling diode. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0025] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0027] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0028] Reference Figure 1 As shown, an embodiment of a fan control and fault feedback circuit of the present invention includes a fan power supply, a fan drive module and a fault feedback module, wherein the fault feedback module includes a second diode Q2, a second transistor D2, a fourth resistor R4 and a fifth resistor R5, wherein the fourth resistor R4 and the fifth resistor R5 are connected in series and then connected in parallel with the fan power supply, and the fifth resistor R5 is simultaneously connected in parallel to the GS port of the second transistor D2, the second diode Q2 and the second transistor D2 are connected in series, and the prototype port of the second diode Q2 is connected to the IO port of fault identification, wherein the purpose of the fourth resistor R4 is to pull up the gate level of the second transistor D2 to a high level, and if the voltage pulled up to 24V is too high when the power supply is 24V, the gate level of the second transistor D2 will be broken down, so the fifth resistor R5 is added as a voltage divider resistor and connected in parallel to the GS end of the second transistor D2 to divide the voltage to prevent the gate level of the second transistor D2 from breaking down.

[0029] It includes a fan operation indication module, the fan operation indication module includes a third resistor R3 and an indicator light LED1, the third resistor R3 and the indicator light LED1 are connected in series and then connected in parallel with the fan power supply;

[0030] The fan drive module includes a first transistor Q1, a gate drive resistor R1, a gate pull-down resistor R2, a gate capacitor C1 and a freewheeling diode D1, wherein the gate drive resistor is connected in series with the gate of the first transistor Q1;

[0031] A gate-level pull-down resistor, for preventing the first transistor Q1 from being mis-turned on, and connected in parallel to both ends of the GS of the first transistor Q1;

[0032] A gate capacitor, controlling the on-time of the first transistor Q1, and connected in parallel to both ends of the GS of the first transistor Q1;

[0033] The fan's freewheeling diode D1 provides a freewheeling circuit when the fan is turned off and is connected in parallel with the fan power supply.

[0034] The first transistor Q1 and the second transistor D2 are specifically MOS tubes, triodes or IGBTs or other switching devices; the fifth resistor R5 can be selected when the fan power supply is low, and the fourth resistor R4 can be selected when the fan is an active output type.

[0035] The circuit operation description of each working state is as follows:

[0036] 1. Reference during normal operation Figure 2 :

[0037] ① is the current path of the fan power supply, and ② is the current path of the feedback circuit.

[0038] Status at this time: the fan works normally, the gate level of the second transistor D2 is pulled down and cut off by the fault feedback pin, the IO pin status is normal, and no fan fault is reported.

[0039] 2. When the power supply is normal and the fan fails, refer to Figure 3 :

[0040] At this time, the first transistor Q1 is turned on, the fan is powered, but the fan is blocked, and the internal transistor T1 of the fault feedback pin is cut off. At this time, the gate voltage of the second transistor D2 is the voltage divided by the fourth resistor R4 / fifth resistor R5 on the power supply, and the second transistor D2 is turned on, pulling the IO port F_ERR low.

[0041] 3. Fan stop status reference Figure 4 :

[0042] At this time, the gate level of the first transistor Q1 is low, the first transistor Q1 is turned off, the fan GND is cut off, there is no current in the fan circuit, the potential of all points on the fan is the same, the gate voltage of the second transistor D2, Vgs = 0V, and the second transistor D2 is turned off. Since the S-pole potential of the second transistor D2 is 24V, the cathode potential of the second diode Q2 is also 24V, and the anode potential of the second diode Q2 is the IO port voltage. It can be seen that the second diode Q2 works in the reverse cut-off state and does not affect the IO port level.

[0043] 4. Multiple fault signals are combined into one fault signal reference Figure 5 :

[0044] When two fans fail, if the system has only one fault input pin signal available, the two outputs need to be directly connected in parallel, which will automatically form an AND gate to integrate the fault signals. If one fan fails, the fault will be reported.

[0045] The above-described embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or changes made by those skilled in the art based on the present invention are within the protection scope of the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. A fan control and fault feedback circuit, characterized in that: The invention comprises a fan power supply, a fan drive module and a fault feedback module, wherein the fault feedback module comprises a second diode (Q2), a second transistor (D2), a fourth resistor (R4) and a fifth resistor (R5), wherein the fourth resistor (R4) and the fifth resistor (R5) are connected in series and then connected in parallel with the fan power supply, and the fifth resistor (R5) is simultaneously connected in parallel to the GS port of the second transistor (D2), the second diode (Q2) and the second transistor (D2) are connected in series, and the prototype port of the second diode (Q2) is connected to the IO port of the fault identification.

2. The fan control and fault feedback circuit according to claim 1, characterized in that: The invention comprises a fan operation indication module, wherein the fan operation indication module comprises a third resistor (R3) and an indicator light (LED1), wherein the third resistor (R3) and the indicator light (LED1) are connected in series and then connected in parallel with the fan power supply.

3. The fan control and fault feedback circuit according to claim 1, characterized in that: The fan drive module comprises a first transistor (Q1), a gate drive resistor (R1), a gate pull-down resistor (R2), a gate capacitor (C1) and a freewheeling diode (D1).

4. The fan control and fault feedback circuit according to claim 3, characterized in that: The gate drive resistor (R1) is connected in series with the gate of the first transistor (Q1), the gate pull-down resistor (R2) is connected in parallel with the GS of the first transistor (Q1), the gate capacitor (C1) is connected in parallel with the GS of the first transistor (Q1), and the freewheeling diode (D1) is connected in parallel with the wind turbine power supply.

5. The fan control and fault feedback circuit according to claim 3, characterized in that: The first transistor (Q1) and the second transistor (D2) are specifically MOS transistors, triodes or IGBTs.

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