CN210431277U - Three-phase brushless direct current fan controller - Google Patents
Three-phase brushless direct current fan controller Download PDFInfo
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- CN210431277U CN210431277U CN201921377309.7U CN201921377309U CN210431277U CN 210431277 U CN210431277 U CN 210431277U CN 201921377309 U CN201921377309 U CN 201921377309U CN 210431277 U CN210431277 U CN 210431277U
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Abstract
The utility model relates to the technical field of controllers, in particular to a three-phase brushless direct current fan controller, which comprises a circuit board box (1), a circuit board component (2), a field effect tube (3), a separation pad (4) and a fastening component, the circuit board assembly (2), the field effect transistor (3), the separating pad (4) and the fastening assembly are fixed inside the circuit board box (1), the outer surface of the circuit board box (1) is provided with a plurality of sawtooth-shaped heat dissipation parts (11), the field effect tube (3) is welded on the circuit board component (2), and is fixed on the inner circumferential surface of the heat dissipation part (11) through a fastening assembly after welding, a separation pad (4) for heat dissipation insulation is arranged between the field effect tube (3) and the circuit board box (1), the field effect tube (3) is used for controlling the current direction of a three-phase winding in the three-phase brushless direct current fan. The utility model discloses change the rotational speed target value according to ambient temperature, guarantee that fan operating current is no longer than the rated current value.
Description
Technical Field
The utility model relates to a controller technical field, concretely relates to three-phase brushless direct current fan controller.
Background
The running temperature and the running current of the fan are important parameters in fan control, and when the external environment temperature changes, the friction retardation coefficient in the fan structure can be influenced, so that the running current of the fan can be influenced. At present, the phenomenon of current increase can appear in the fan of domestic development under low temperature environment, reduces the security of power and fan operation. Therefore, a fan controller capable of ensuring that the running current of the fan does not exceed the rated current at any ambient temperature is urgently needed.
SUMMERY OF THE UTILITY MODEL
To the above-mentioned weak point that exists among the prior art, the to-be-solved technical problem of the utility model is to provide a three-phase brushless DC fan controller.
In order to achieve the above object, the utility model adopts the following technical scheme:
a three-phase brushless direct current fan controller comprises a circuit board box, a circuit board assembly, a field effect tube, a separating pad and a fastening assembly, wherein the circuit board assembly, the field effect tube, the separating pad and the fastening assembly are fixed inside the circuit board box, a plurality of sawtooth-shaped heat dissipation parts are arranged on the outer surface of the circuit board box, the field effect tube is welded on the circuit board assembly and fixed on the inner peripheral surface of the heat dissipation parts through the fastening assembly after being welded, the separating pad used for heat dissipation insulation is arranged between the field effect tube and the circuit board box, and the field effect tube is used for controlling the current direction of a three-phase winding in the three-phase brushless direct current fan.
Preferably, the fastening assembly includes a nut, a flat washer, a spring washer, and a screw.
Preferably, the circuit board assembly comprises a single chip microcomputer, a motor controller, an isolation driving circuit, a three-phase inverter bridge, a current detection circuit, a temperature detection module and a direct current power supply module, wherein the input end of the single chip microcomputer is connected with the temperature detection module, the output end of the single chip microcomputer is connected with the motor controller, the output end of the motor controller is connected with the isolation driving circuit, the output end of the isolation driving circuit is connected with the three-phase inverter bridge formed by field effect transistors, the output end of the three-phase inverter bridge is connected with the current detection circuit, and the current detection circuit feeds back signals to the motor controller; the single chip microcomputer is used for controlling the slow start of the rotating speed of the fan to gradually accelerate to a steady state operation, inputting a rotating speed signal, a steering signal and an operation mode which are sent to the motor controller, the temperature detection module is used for detecting the temperature inside the three-phase brushless direct current fan, the direct current power supply module is used for supplying power to all components on the circuit board assembly, and the motor controller is used for outputting control signals for controlling the field effect tube to be switched on and off and feeding back fault signals to the single chip microcomputer according to rotor position information output by the rotor position sensor.
Preferably, the motor controller employs MC 33035.
Preferably, the field effect transistor adopts IRFP 4468.
Use the utility model discloses a beneficial effect is:
1. the utility model controls the starting and running of the fan, can realize the slow starting of the fan and limit the starting current; the rotating speed closed-loop PI regulation is realized, the control precision is high, and the anti-interference capability is strong; the utility model discloses can change the rotational speed target value according to ambient temperature, guarantee that fan operating current is no longer than the rated current value.
2. The utility model discloses simple structure, intensity are high, and the radiating effect is good, can improve operating efficiency.
3. The utility model discloses overvoltage protection, overcurrent protection, power prevent the reverse protection function still have, have improved the security of system operation.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic side view of the present invention;
fig. 3 is a schematic block diagram of the circuit board assembly of the present invention;
fig. 4 is a schematic diagram of a control circuit of the motor controller of the present invention connected to an isolation driving circuit, a three-phase inverter bridge, and a current detection circuit;
FIG. 5 is a schematic diagram of the single chip microcomputer control circuit of the present invention;
fig. 6 is a schematic circuit diagram of the dc power supply module of the present invention;
fig. 7 is a schematic circuit diagram of the temperature detection module of the present invention;
the reference numerals include:
1-circuit board box, 11-heat dissipation part, 2-circuit board component, 3-field effect transistor, 4-separation pad, 5-nut,
6-flat washer, 7-spring washer, 8-screw.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1-2, a three-phase brushless dc fan controller comprises a circuit board box 1, a circuit board assembly 2, a field effect transistor 3, a separation pad 4 and a fastening assembly, wherein the circuit board assembly 2, the field effect transistor 3, the separation pad 4 and the fastening assembly are fixed inside the circuit board box 1, the outer surface of the circuit board box 1 is provided with a plurality of saw-toothed heat dissipation portions 11, the structure is favorable for outward heat dissipation inside a fan, the air contact area is increased, the heat dissipation effect is increased, the working efficiency is improved, the field effect transistor 3 is welded on the circuit board assembly 2 and is fixed on the inner circumferential surface of the heat dissipation portion 11 through the fastening assembly after welding, the separation pad 4 for heat dissipation insulation is arranged between the field effect transistor 3 and the circuit board box 1, and the field effect transistor 3 is used for controlling the current direction of a three-phase winding in the. The fastening assembly comprises a nut 5, a flat washer 6, a spring washer 7 and a screw 8.
When the field effect transistor is assembled, the field effect transistor 3 is firstly welded on a corresponding welding pad in the circuit board assembly 2, then the field effect transistor 3 and the circuit board assembly are arranged inside the circuit board box 1 together, a separating pad 4 with a heat conducting and insulating effect is added between the field effect transistor 3 and the circuit board box 1, and finally the field effect transistor is fixed through a screw 6, a flat washer 5, a spring washer 4 and a nut 3.
As shown in fig. 3, the circuit board assembly includes a single chip, a motor controller, an isolation driving circuit, a three-phase inverter bridge, a current detection circuit, a temperature detection module and a dc power supply module, wherein an input end of the single chip is connected to the temperature detection module, an output end of the single chip is connected to the motor controller, an output end of the motor controller is connected to the isolation driving circuit, an output end of the isolation driving circuit is connected to the three-phase inverter bridge formed by the field effect transistor 3, an output end of the three-phase inverter bridge is connected to the current detection circuit, and the current detection circuit feeds back a signal to the motor controller; the single chip microcomputer is used for controlling rotating speed signals, steering signals and running modes input to the motor controller, the temperature detection module is used for detecting the temperature inside the three-phase brushless direct current fan, the direct current power supply module is used for supplying power to all components on the circuit board assembly, and the motor controller is used for outputting control signals for controlling the field effect tube 3 to be switched on and off according to rotor position information output by the rotor position sensor. The single chip microcomputer can output different voltage value signals to the motor controller to adjust the rotating speed signal; the single chip microcomputer can output high voltage/low voltage to the motor controller so as to switch forward and reverse rotation; the single chip microcomputer can switch the running mode of the fan, and selects the working mode of the three-phase brushless direct current fan: 60 degrees and 120 degrees.
As shown in fig. 4, the isolation driving circuit is composed of two optical couplers (U2, U3), 3 diodes (D1, D3, D4) and 3 resistors (R2, R3, R4), the input end of the isolation driving circuit is connected to BT, AT, CT pins of the motor controller, the output end is connected to a three-phase inverter bridge, which is composed of 6 MOSFETs, each phase of the bridge circuit is connected to a three-phase winding of the fan respectively to control the on-off of the current in the winding, the current detection circuit includes a capacitor C5 and 2 resistors (R16, R17), one end of the current detection circuit is connected to the three-phase inverter bridge, the other end is input to the motor controller to feed back current signals, and the working voltage and the working current are fed back to the motor controller through the voltage and current changes in the R16, R17 sampling circuits when the fan operates, so as to protect the motor and the over-voltage.
As shown in fig. 5, the single chip microcomputer inputs a PWM signal and a rotation speed signal to the motor controller to control the rotation direction, the rotation speed and the operation mode of the fan, and the temperature detection module inputs a Vol signal to the single chip microcomputer to control the rotation speed of the fan according to the real-time temperature adjustment.
As shown in fig. 6, the dc power supply module includes a thermistor, a fast recovery diode, a three-terminal regulator, a zener diode, a non-polar capacitor, and an electrolytic capacitor, which supplies power to the components on the circuit board assembly.
As shown in fig. 7, the temperature detection module includes a resistor R20, a thermistor R22, and a capacitor C13, and feeds back a fan temperature signal Vol detected by a temperature sensor (i.e., the thermistor R22) in the fan to the single chip, so that the single chip controls the motor controller according to the temperature in the fan to adjust the rotation speed of the fan. When the temperature is high, the target value of the control rotating speed is consistent with the target value at normal temperature; when the temperature is reduced, the resistance value of R22 is increased, Vol is increased to a high level, and the single chip microcomputer gradually reduces the target rotating speed value according to the received Vol signal, so that the running current of the fan does not exceed the rated current value all the time.
The working principle of the three-phase brushless direct current fan controller is as follows: the phase change of the fan winding is completed by a motor controller (the model of the motor controller is MC33035), a rotor position sensor collects rotor position information of the fan body, the collected information is transmitted to the motor controller, the motor controller outputs corresponding control signals according to the rotor position information, the control signals control the on and off of a corresponding field effect tube 3 (namely a three-phase inverter bridge) after passing through an isolation driving circuit, the current direction in the three-phase winding in the brushless direct current fan is controlled, a magnetic field generated by current in the three-phase winding interacts with a rotor magnetic field, the rotor rotates under the action of the magnetic field force, the rotor position sensor continuously collects the rotor position information, the operation is repeated, and the fan continuously rotates.
The slow start, the accelerated running and the closed-loop control of the rotating speed of the fan are realized by a singlechip. The PWM signal input to the motor controller by the singlechip is gradually increased, so that the rotating speed of the fan operates according to a specified acceleration curve; when the rotating speed reaches the final stage of acceleration, the rotating speed is switched to rotating speed closed-loop control, the single chip microcomputer collects the running speed of the fan in real time, the running speed of the fan is compared with a target value of the rotating speed of the fan, and the PWM duty ratio is adjusted by adopting a PI control mode to realize the rotating speed closed-loop control; a temperature sensor in the fan monitors fan temperature information in real time, and the single chip microcomputer collects the temperature information and calculates corresponding rotating speed target values to realize different rotating speed control at different temperatures, so that the running current of the fan is not greater than the rated current all the time.
The above description is only a preferred embodiment of the present invention, and many changes can be made in the detailed description and the application scope according to the idea of the present invention for those skilled in the art, which all belong to the protection scope of the present invention as long as the changes do not depart from the concept of the present invention.
Claims (5)
1. The utility model provides a three-phase brushless direct current fan controller which characterized in that: the circuit board comprises a circuit board box (1), a circuit board assembly (2), a field effect tube (3), a separation pad (4) and a fastening assembly, wherein the circuit board assembly (2), the field effect tube (3), the separation pad (4) and the fastening assembly are fixed inside the circuit board box (1), a plurality of sawtooth-shaped heat dissipation parts (11) are arranged on the outer surface of the circuit board box (1), the field effect tube (3) is welded on the circuit board assembly (2) and fixed on the inner circumferential surface of the heat dissipation parts (11) through the fastening assembly after welding, the separation pad (4) used for heat dissipation insulation is arranged between the field effect tube (3) and the circuit board box (1), and the field effect tube (3) is used for controlling the current direction of a three-phase winding in a three-phase brushless direct current fan.
2. The three-phase brushless dc fan controller of claim 1, wherein: the fastening assembly comprises a nut (5), a flat washer (6), a spring washer (7) and a screw (8).
3. The three-phase brushless dc fan controller of claim 1, wherein: the circuit board assembly (2) comprises a single chip microcomputer, a motor controller, an isolation driving circuit, a three-phase inversion bridge, a current detection circuit, a temperature detection module and a direct current power supply module, wherein the input end of the single chip microcomputer is connected with the temperature detection module, the output end of the single chip microcomputer is connected with the motor controller, the output end of the motor controller is connected with the isolation driving circuit, the output end of the isolation driving circuit is connected with the three-phase inversion bridge formed by a field effect tube (3), the output end of the three-phase inversion bridge is connected with the current detection circuit, and the current detection circuit feeds back signals to the motor controller; the single chip microcomputer is used for controlling the slow start of the rotating speed of the fan to gradually accelerate to a steady state operation, inputting a rotating speed signal, a steering signal and an operation mode to the motor controller, the temperature detection module is used for detecting the temperature inside the three-phase brushless direct current fan, the direct current power supply module is used for supplying power to all components on the circuit board assembly, and the motor controller is used for outputting a control signal for controlling the on and off of the field effect tube (3) and a feedback fault signal to the single chip microcomputer according to the rotor position information output by the rotor position sensor.
4. The three-phase brushless dc fan controller of claim 3, wherein: the motor controller employs MC 33035.
5. The three-phase brushless dc fan controller of claim 1, wherein: the field effect transistor (3) adopts IRFP 4468.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921377309.7U CN210431277U (en) | 2019-08-22 | 2019-08-22 | Three-phase brushless direct current fan controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921377309.7U CN210431277U (en) | 2019-08-22 | 2019-08-22 | Three-phase brushless direct current fan controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210431277U true CN210431277U (en) | 2020-04-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921377309.7U Active CN210431277U (en) | 2019-08-22 | 2019-08-22 | Three-phase brushless direct current fan controller |
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| CN (1) | CN210431277U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110460267A (en) * | 2019-08-22 | 2019-11-15 | 沈阳兴华航空电器有限责任公司 | A kind of three-phase brushless DC fan controller |
-
2019
- 2019-08-22 CN CN201921377309.7U patent/CN210431277U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110460267A (en) * | 2019-08-22 | 2019-11-15 | 沈阳兴华航空电器有限责任公司 | A kind of three-phase brushless DC fan controller |
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