Fan circuit

Abstract

The utility model provides a fan circuit. The fan circuit comprises a fan, a circuit board, a first relay, a second relay and a current transformer. The fan is in electric signal connection with the circuit board. The first relay and the second relay are arranged in parallel and are connected between the fan and the circuit board. The current transformer is used for detecting the current of the fan circuit and controlling the first relay or the second relay to be powered on, so that the fan keeps rotating forwards. The current transformer is arranged to detect the state of the draught fan, the first relay or the second relay is controlled to be powered on to enable the draught fan to keep forward rotation all the time, reverse rotation of the draught fan is avoided, and the operation efficiency of the draught fan is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fan circuit, in particular to a fan circuit. BACKGROUND

[0002] With the increasing of people's living standards, there are many different types of fans on the market. The fan can include brush fan, brushless fan and other machines to provide ventilation or ventilation. The traditional fan circuit often appears the phenomenon of fan reverse when installing brush fan. The current abnormality can be found only when testing the fan circuit at the end, the air volume is less than the test value, and the positive and negative poles of the fan need to be manually exchanged, the production efficiency is low. When the customer side maintains or replaces the fan, the reverse connection of the fan will cause insufficient air supply, and the customer experience is poor.

[0003] Therefore, it is necessary to provide an improved fan circuit to solve the above problems. CONTENT OF THE INVENTION

[0004] The present application provides a fan circuit for improving the working efficiency of the fan.

[0005] The present application provides a fan circuit, comprising a fan, a circuit board, a first relay, a second relay and a current transformer, the fan is electrically connected with the circuit board; the first relay and the second relay are connected between the fan and the circuit board; the current transformer is used for detecting the current of the fan circuit and controlling the first relay or the second relay to be powered on, so that the fan keeps rotating forward.

[0006] Further, the first relay comprises a first coil and a first contact electrically connected; the second relay comprises a second coil and a second contact electrically connected; the first coil and the second coil are connected in parallel and electrically connected with the circuit board; the first contact and the second contact are connected in parallel and electrically connected with the fan.

[0007] Further, the fan circuit further comprises a fan power supply, the fan power supply is electrically connected with the fan, and the first contact and the second contact are connected between the fan power supply and the fan.

[0008] Further, the fan power supply has a positive input end and a negative input end, the first contact is provided with two, one of which is connected between the positive input end and the fan, and the other is connected between the negative input end and the fan.

[0009] Further, the fan power supply has a power supply positive input end and a power supply negative input end, the second contact is provided with two, one of which is connected between the power supply positive input end and the fan, and the other is connected between the power supply negative input end and the fan.

[0010] Further, the current transformer is electrically connected with the circuit board, and the current transformer is provided in parallel with the first coil and the second coil.

[0011] Further, the fan circuit is further provided with a ground wire, and the circuit board, the first coil and the second coil are grounded through the ground wire.

[0012] Further, the fan and the fan power supply are grounded through the ground wire.

[0013] Further, when the fan circuit is started, the first coil is powered, and the first contact is closed; when the current transformer detects that the current in the fan circuit is greater than or equal to a set threshold value, the first contact remains closed, and the fan and the fan power supply are connected to realize forward rotation.

[0014] Further, when the current transformer detects that the current in the fan circuit is less than the set threshold value, the second coil is powered, the second contact is closed, and the fan and the fan power supply are connected to realize forward rotation; the set threshold value is 6A.

[0015] The application detects the fan state by setting a current transformer, and always keeps the fan rotating forward by controlling the first relay or the second relay to be powered on, so as to avoid the reverse rotation of the fan during operation and improve the operation efficiency of the fan. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 is a connection diagram of the fan circuit of the application.

[0017] Fig. 2 is a structural diagram of the fan circuit of the application.

[0018] BRIEF DESCRIPTION OF DRAWINGS

[0019] 10, fan; 20, circuit board; 21, quick plug; 22, communication line; 30, first relay; 31, first coil; 32, first contact; 40, second relay; 41, second coil; 42, second contact; 50, current transformer; 60, fan power supply; 61, power supply positive input end; 62, power supply negative input end; 70, ground wire. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments (or, modes of implementation) of the present application will be described clearly and completely in conjunction with the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated.

[0021] If the application embodiments involve directional indications or positional relationships (for example, up, down, left, right, front, back, inner, outer, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationship, movement, etc. between the components in a certain posture (as shown in the drawings); if the specific posture changes, the directional indication or positional relationship will also change accordingly. In addition, the terms "first", "second", etc. in the application embodiments are only used for convenience of description, and cannot be understood as indicating or implying relative importance.

[0022] Referring to Figs. 1-2 As shown in the drawings, the present application provides a fan circuit, which includes a fan 10, a circuit board 20, a first relay 30, a second relay 40, and a current transformer 50. The fan 10 is electrically connected to the circuit board 20. The first relay 30 and the second relay 40 are arranged in parallel. The first relay 30 and the second relay 40 are connected between the fan 10 and the circuit board 20. The current transformer 50 is used to detect the current in the fan circuit and control the first relay 30 or the second relay 40 to be powered on, so that the fan 10 remains in forward rotation.

[0023] The fan circuit further includes a fan power supply 60 and a ground wire 70. The fan power supply 60 is electrically connected to the fan 10 and supplies power to the fan 10. The ground wire 70 is connected to the fan 10 and grounds the fan 10.

[0024] According to the embodiments of the present application, the fan 10 is a brush fan, and the fan circuit of the present application can be applied to a bus unit. The fan 10 promotes air flow by forward rotation, dissipates the internal heat of the bus unit, and ensures that the equipment of the bus unit operates within a stable and safe temperature range.

[0025] The circuit board 20 is electrically connected to the first relay 30, the second relay 40, and the current transformer 50. The circuit board 20 is used to receive signals from the current transformer 50 and, according to the detected current condition, to power on the first relay 30 or the second relay 40, so that the fan 10 rotates forward. By real-time monitoring of the current in the fan circuit through the current transformer 50, the switching of the first relay 30 and the second relay 40 can be accurately controlled, and the fan 10 can be adjusted in time to rotate in the opposite direction in the case of reverse rotation or other abnormal conditions, so as to realize stable operation.

[0026] According to the embodiments of the present application, a microcontroller (not shown) or an integrated circuit (IC) is arranged in the circuit board 20 for processing the signals from the current transformer 50 and outputting control signals to the first relay 30 or the second relay 40.

[0027] The circuit board 20 is provided with a quick connector 21. The circuit board 20 is electrically connected with the first relay 30, the second relay 40 and the current transformer 50 through a communication line 22. The communication line 22 is connected with the circuit board 20 through the quick connector 21. The quick connector 21 can simplify the connection and disconnection process of the communication line 22 and the circuit board 20, and only needs to be simply plugged in or pulled out during assembly or maintenance to achieve quick connection or separation, thereby improving the convenience of maintenance.

[0028] According to other embodiments of the present application, the communication line can also be directly welded with the circuit board to achieve electrical signal connection.

[0029] In some other embodiments, the circuit board can be arranged as multiple modules, and each module is provided with an independent quick connector or connector. When needed, a specific circuit board module can be quickly replaced, thereby improving the flexibility of the fan circuit.

[0030] The first relay 30 includes a first coil 31 and a first contact 32 electrically connected. The first coil 31 is electrically connected with the first contact 32. The first contact 32 is connected between the fan power supply 60 and the fan 10, and controls the closing and opening of the first contact 32 by receiving the electrical signals transmitted by the current transformer 50, so as to control the on-off of the fan power supply 60 and the fan 10.

[0031] According to the embodiments of the present application, the first contact 32 is arranged as two, and the two first contacts 32 are connected in series on both sides of the fan 10. Both of the two first contacts 32 are connected between the fan 10 and the fan power supply 60. The two first contacts 32 in series can form the function of a safety switch, and only when both of the two first contacts 32 are closed, the fan power supply 60 will be connected with the fan 10.

[0032] The second relay 40 includes a second coil 41 and a second contact 42 electrically connected. The second coil 41 is electrically connected with the second contact 42. The second contact 42 is connected between the fan power supply 60 and the fan 10, and controls the closing and opening of the second contact 42 by receiving the electrical signals transmitted by the current transformer 50, so as to control the on-off of the fan power supply 60 and the fan 10.

[0033] According to the embodiments of this application, two second contacts 42 are configured, and the two second contacts 42 are connected in series on both sides of the fan 10. Both second contacts 42 are connected between the fan 10 and the fan power supply 60. The two second contacts 42 connected in series can form a safety switch function, and the fan power supply 60 will only be connected to the fan 10 when both second contacts 42 are closed.

[0034] The first coil 31 and the second coil 41 are connected in parallel and electrically connected to the circuit board 20. The first contact 32 and the second contact 42 are connected in parallel and electrically connected to the fan 10. The current transformer 50 is electrically connected to the circuit board 20 and is connected in parallel with the first coil 31 and the second coil 41. The current transformer 50 monitors the current changes in the fan circuit in real time and feeds back the current signal to the circuit board 20.

[0035] In some implementations, in addition to the current transformer 50, a voltage sensor or a temperature sensor can be added to achieve more comprehensive monitoring and control, such as automatically cutting off the power supply to the fan 10 when the fan 10 temperature is detected to be too high.

[0036] The fan power supply 60 has a positive power input terminal 61 and a negative power input terminal 62. One first contact 32 is connected between the positive power input terminal 61 and the fan 10, and the other first contact 32 is connected between the negative power input terminal 62 and the fan 10. One second contact 42 is connected between the positive power input terminal 61 and the fan 10, and the other second contact 42 is connected between the negative power input terminal 62 and the fan 10.

[0037] In some other implementations, an embedded system can be introduced into the circuit board, combined with a current transformer, to implement more complex control strategies and automatically adjust the operating status of the fan to adapt to different loads and environmental conditions.

[0038] The fan circuit is also equipped with a ground wire 70. The circuit board 20, the first coil 31, and the second coil 41 are all grounded through the ground wire 70. Grounding can effectively prevent static electricity accumulation and leakage, reduce safety hazards caused by the operation of the fan circuit, and protect the safety of operators and equipment.

[0039] When the fan circuit is started, the first coil 31 is powered, and at this time the first contact 32 is closed. The current transformer 50 detects the current in the fan circuit and waits for 10 seconds, and when the detected current is greater than or equal to the set threshold value, the fan 10 is in a forward rotation state. The circuit board 20 controls the first contact 32 to remain closed, and the fan 10 is connected to the fan power supply 60 to realize the forward rotation of the fan 10. If the current transformer 50 detects that the current in the fan circuit is less than the set threshold value, the fan 10 is in a reverse rotation state. The current transformer 50 transmits an electrical signal to the circuit board 20, and the circuit board 20 controls the second coil 41 to be powered, at which time the second contact 42 is closed, and the fan 10 is connected to the fan power supply 60 to realize the forward rotation of the fan 10. The set threshold value of the current transformer 50 is 6A.

[0040] The application detects the state of the fan 10 by setting the current transformer 50, and always keeps the fan 10 in forward rotation by controlling the power supply of the first relay 30 or the second relay 40, thereby avoiding the reverse rotation of the fan 10 during operation and improving the operation efficiency of the fan 10.

[0041] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without conflict, and the scope of protection of the application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the application shall be included in the scope of protection of the application.

Claims

1. A fan circuit, characterized in that, The device includes a fan, a circuit board, a first relay, a second relay, and a current transformer. The fan is electrically connected to the circuit board. The first relay and the second relay are connected in parallel between the fan and the circuit board. The current transformer is used to detect the current in the fan circuit and control the first relay or the second relay to be energized so that the fan keeps rotating in the forward direction.

2. The fan circuit according to claim 1, characterized in that, The first relay includes a first coil and a first contact connected by an electrical signal; the second relay includes a second coil and a second contact connected by an electrical signal; the first coil and the second coil are connected in parallel and are electrically connected to the circuit board; the first contact and the second contact are connected in parallel and are electrically connected to the fan.

3. The fan circuit according to claim 2, characterized in that, The fan circuit also includes a fan power supply, which is electrically connected to the fan, and the first contact and the second contact are connected between the fan power supply and the fan.

4. The fan circuit according to claim 3, characterized in that, The power supply for the fan has a positive input terminal and a negative input terminal. There are two first contacts, one of which is connected between the positive input terminal and the fan, and the other is connected between the negative input terminal and the fan.

5. The fan circuit according to claim 3, characterized in that, The power supply for the fan has a positive input terminal and a negative input terminal. There are two second contacts, one of which is connected between the positive input terminal and the fan, and the other is connected between the negative input terminal and the fan.

6. The fan circuit according to claim 2, characterized in that, The current transformer is electrically connected to the circuit board, and the current transformer is connected in parallel with the first coil and the second coil.

7. The fan circuit according to claim 3, characterized in that, The fan circuit is also equipped with a ground wire, and the circuit board, the first coil and the second coil are grounded through the ground wire.

8. The fan circuit according to claim 7, characterized in that, The fan and the fan power supply are grounded through the ground wire.

9. The fan circuit according to claim 3, characterized in that, When the fan circuit is started, the first coil is energized and the first contact is closed; when the current transformer detects that the current in the fan circuit is greater than or equal to a set threshold, the first contact remains closed, and the fan is connected to the fan power supply to achieve forward rotation.

10. The fan circuit according to claim 9, characterized in that, The current transformer detects that the current in the fan circuit is less than the set threshold, the second coil is energized, the second contact is closed, and the fan is connected to the fan power supply to achieve forward rotation; the set threshold is 6A.

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