Integrated driving control circuit of low-voltage fan

Abstract

The utility model belongs to the technical field of electronic circuits, and particularly relates to an integrated driving control circuit of a low-voltage fan, which is characterized in that an upper computer main control MCU (Microprogrammed Control Unit) is respectively connected with a buzzer driving circuit, a touch sensing circuit, an RF (Radio Frequency) receiving circuit and an LED (Light Emitting Diode) indicating lamp circuit; the motor drive master control MCU is connected with the hardware overcurrent detection circuit, the bus voltage detection circuit, the motor master control MCU burning interface, the stepping motor drive control circuit and the brushless direct current motor drive control circuit. The brushless direct current motor drive control circuit is connected with the phase current sampling circuit and the phase current amplification circuit. The upper computer master control MCU and the motor drive master control MCU are both connected with the DC-DC Buck conversion circuit. The problem that an upper computer control board and a motor driving board are incompatible in the prior art is solved.

Description

Technical Field

[0001] This utility model belongs to the field of electronic circuit technology, specifically relating to an integrated drive control circuit for a low-voltage fan. Background Technology

[0002] Most existing products on the market have separate upper computer control boards and motor drive boards, which can easily lead to incompatibility between the two circuits, causing electronic components to burn out. The connection between them is made through terminals and wires, which can easily become loose during transportation. EMC interference can easily occur between the ribbon cables. Control signals are delayed and interfered with after being transmitted through long wires, making product maintenance troublesome. Utility Model Content

[0003] This invention provides an integrated low-pressure fan drive control circuit to solve the problem of incompatibility between the host computer control board and the motor drive board in the prior art.

[0004] This utility model is achieved through the following technical solution:

[0005] A low-voltage fan integrated drive control circuit, wherein the host computer drive control system includes a buzzer drive circuit, a touch sensing circuit, a host computer main control MCU, an RF receiving circuit, and an LED indicator circuit;

[0006] The host computer's main control MCU is connected to the buzzer driver circuit, touch sensing circuit, RF receiver circuit, and LED indicator circuit, respectively.

[0007] The motor drive control system includes a hardware overcurrent detection circuit, a bus voltage detection circuit, a motor main control MCU programming interface, a motor drive main control MCU, a stepper motor drive control circuit, a brushless DC motor drive control circuit, a phase current sampling circuit, and a phase current amplification circuit.

[0008] The motor drive main control MCU is connected to the hardware overcurrent detection circuit, the bus voltage detection circuit, the motor main control MCU programming interface, the stepper motor drive control circuit, and the brushless DC motor drive control circuit, respectively.

[0009] The brushless DC motor drive control circuit is connected to the phase current sampling circuit and the phase current amplification circuit, respectively.

[0010] The host computer main control MCU, stepper motor drive control circuit, brushless DC motor drive control circuit, and motor drive main control MCU are all connected to the DC-DC Buck converter circuit.

[0011] Furthermore, the DC-DC Buck converter circuit includes a chip U2. Terminal 1 of the chip U2 is connected to the positive terminal of capacitor CAP2, the negative terminal of Zener diode TVS1, the positive terminal of capacitor CAP1, one end of capacitor C1, the output terminal 24V, and terminal 1 of high-voltage load switch CN3. Terminal 2 of the chip U2 is connected to the negative terminal of capacitor CAP2, the positive terminal of Zener diode TVS1, the negative terminal of capacitor CAP1, the other end of capacitor C1, and terminal 2 of high-voltage load switch CN3, and then grounded. Terminal 5 of the chip U2 is connected to one end of inductor L3. The other end of inductor L3 is connected to terminal 4 of the chip U2, the positive terminal of capacitor CAP3, one end of capacitor C1, and VDD5. The negative terminal of capacitor CAP3 is connected to the other end of capacitor C2 and then grounded.

[0012] The bus voltage detection circuit is connected to the 24V output terminal of the DC-DC Buck converter circuit. The 24V output terminal is connected to one end of resistor R7. The other end of resistor R7 is connected to one end of resistor R8 and one end of resistor R9. The other end of resistor R8 is connected to terminal 6 of chip U4 and one end of capacitor C3. The other end of resistor R9 is connected to the other end of capacitor C3 and then grounded.

[0013] Furthermore, the host computer main control MCU includes a chip U6, with terminal 1 of the chip U6 connected to one end of capacitor C29 and the ground terminal, and the other end of capacitor C29 connected to terminal 20 of the chip U6 and the VDD5 terminal.

[0014] Terminal 3 of chip U6 is connected to one end of resistor R40 in the LED indicator circuit, and the other end of resistor R40 is connected to the negative terminal of LED1.

[0015] Terminal 4 of chip U6 is connected to one end of resistor R41 in the LED indicator circuit, and the other end of resistor R41 is connected to the negative terminal of LED2.

[0016] Terminal 5 of chip U6 is connected to one end of resistor R42 in the LED indicator circuit, and the other end of resistor R42 is connected to the negative terminal of LED3.

[0017] Terminal 6 of chip U6 is connected to one end of resistor R43 in the LED indicator circuit, and the other end of resistor R43 is connected to the negative terminal of LED4.

[0018] Terminal 7 of chip U6 is connected to one end of resistor R44 in the LED indicator circuit, and the other end of resistor R44 is connected to the negative terminal of LED5.

[0019] Terminal 8 of chip U6 is connected to one end of resistor R45 in the LED indicator circuit, and the other end of resistor R45 is connected to the negative terminal of LED6.

[0020] The positive terminal of LED1 is connected to the positive terminals of LED2, LED3, LED4, LED5, and LED6, and the VDD5 terminal, respectively.

[0021] Terminal 9 of chip U6 is connected to one end of resistor R48 in the touch sensing circuit, and the other end of resistor R48 is connected to touch terminal K4. Terminal 10 of chip U6 is connected to one end of resistor R49 in the touch sensing circuit, and the other end of resistor R49 is connected to touch terminal K3. Terminal 11 of chip U6 is connected to one end of resistor R46 in the touch sensing circuit, and the other end of resistor R46 is connected to touch terminal K2. Terminal 14 of chip U6 is connected to one end of resistor R47 in the touch sensing circuit, and the other end of resistor R47 is connected to touch terminal K1.

[0022] The chip U6 is grounded after being connected in series with capacitor C21 at terminal 12.

[0023] Terminal 16 of the chip U6 is connected to the buzzer driver circuit;

[0024] Terminal 17 of the chip U6 is connected to the RF receiving circuit;

[0025] Terminal 18 of chip U6 is connected to terminal 21 of chip U4, and terminal 19 of chip U6 is connected to terminal 20 of chip U4.

[0026] Furthermore, the buzzer driving circuit includes a resistor R50. One end of the resistor R50 is connected to terminal 1 of transistor Q4 and one end of resistor R51. The other end of the resistor R51 is connected to terminal 2 of transistor Q4 and then grounded. Terminal 3 of transistor Q4 is connected to one end of buzzer BZ1 and the positive terminal of diode D1. The other end of buzzer BZ1 is connected to one end of resistor R55 and the negative terminal of diode D1. The other end of resistor R55 is connected to VDD5.

[0027] Furthermore, the RF receiving circuit includes a chip U5. Terminal 1 of the chip U5 is connected to one end of inductor L2, one end of inductor L1, and one end of capacitor C26, and then grounded. Terminal 2 of the chip U5 is connected to one end of capacitor C25 and the other end of inductor L2. The other end of capacitor C25 is connected to one end of inductor L1, the other end of capacitor C26, and ANT1.

[0028] Terminal 3 of chip U5 is connected to one end of capacitor C22, one end of capacitor C23, one end of capacitor C24 and VDD5 respectively. The other end of capacitor C22 is connected to the other end of capacitor C23 and the other end of capacitor C24 respectively and then grounded.

[0029] Terminal 5 of chip U5 is connected to one end of resistor R5. The other end of resistor R5 is connected to one end of capacitor C28 and terminal 17 of chip U6. The other end of capacitor C28 is connected to terminal 6 of chip U5. Terminal 7 of chip U5 is connected to one end of capacitor C27. Terminal 8 of chip U5 is connected to terminal 1 of crystal oscillator Y1. The other end of capacitor C27 is connected to the other end of capacitor C28 and terminal 2 of crystal oscillator Y1, and then grounded.

[0030] Furthermore, the motor drive main control MCU includes a chip U4. Terminal 1 of chip U4 is connected to one end of capacitor C4, terminal 7 of chip U4, one end of capacitor C5, and terminal VDD5. The other end of capacitor C4 is grounded, and the other end of capacitor C5 is also grounded. Terminal 8 of chip U4 is connected to one end of capacitor C6, one end of capacitor C7, and the DC-DC converter. The output terminal of the Buck converter circuit is connected to 24V. The other end of capacitor C6 is connected to the other end of capacitor C7 and then grounded. Terminal 24 of chip U4 is connected to ground in series with capacitor C8. Terminal 5 of chip U4 is connected to the hardware overcurrent detection circuit. Terminal 6 of chip U4 is connected to the bus voltage detection circuit. Terminal 9 of chip U4 is connected to one end of resistor R20 of the brushless DC motor drive control circuit. Terminal 10 of chip U4 is connected to one end of resistor R22 of the brushless DC motor drive control circuit. Terminal 11 of chip U4 is connected to one end of resistor R24 ​​of the brushless DC motor drive control circuit. Terminal 12 of chip U4 is connected to one end of resistor R26 of the brushless DC motor drive control circuit. Terminal 13 of chip U4 is connected to one end of resistor R28 of the brushless DC motor drive control circuit. Terminal 14 of chip U4 is connected to one end of resistor R30 of the brushless DC motor drive control circuit.

[0031] Terminal 16 of chip U4 is connected to one end of resistor R34 and one end of capacitor C18 in the phase current amplifier circuit; terminal 17 of chip U4 is connected to one end of resistor R35 and the other end of capacitor C18 in the phase current amplifier circuit; terminal 18 of chip U4 is connected to one end of resistor R32 and one end of capacitor C17 in the phase current amplifier circuit; and terminal 19 of chip U4 is connected to one end of resistor R35 and one end of capacitor C17 in the phase current amplifier circuit.

[0032] Pin 19 of the chip U4 is connected to one end of resistor R1 in the stepper motor drive control circuit and pin 4 of the motor main control MCU programming interface.

[0033] Terminal 2 of the chip U4 is connected to one end of resistor R2 in the stepper motor drive control circuit.

[0034] Terminal 3 of the chip U4 is connected to one end of resistor R3 in the stepper motor drive control circuit.

[0035] Terminal 4 of the chip U4 is connected to one end of resistor R4 in the stepper motor drive control circuit.

[0036] The 23rd terminal of the chip U4 is connected to the 3rd terminal of the motor main control MCU programming interface.

[0037] Furthermore, the hardware overcurrent detection circuit includes a resistor R52. One end of the resistor R52 is connected to terminal 5 of chip U4, one end of resistor R53, one end of resistor R54, and one end of capacitor C16. The other end of the resistor R52 is connected to the phase current amplifier circuit. The other end of the resistor R53 is connected to VDD5. The other end of the resistor R54 is connected to the other end of capacitor C16 and then grounded.

[0038] The bus voltage detection circuit includes a resistor R8. One end of the resistor R8 is connected to terminal 5 of the chip U4 and one end of the capacitor C3. The other end of the resistor R8 is connected to one end of the resistor R7 and one end of the resistor R9. The other end of the resistor R7 is connected to the 24V output terminal of the DC-DC Buck converter circuit. The other end of the resistor R9 is connected to the other end of the capacitor C3 and then grounded.

[0039] Furthermore, the stepper motor drive control circuit includes a resistor R1, the other end of which is connected to terminal 4 of the driver chip U3; the other end of the resistor R2 is connected to terminal 3 of the driver chip U3; the other end of the resistor R3 is connected to terminal 2 of the driver chip U3; the other end of the resistor R4 is connected to terminal 1 of the driver chip U3; terminal 5 of the driver chip U3 is connected to one end of capacitor C20 and then grounded; the other end of capacitor C20 is connected to terminal 6 of the driver chip U3, one end of capacitor C19, terminal 1 of CN2, and the 24V output terminal of the DC-DC Buck converter circuit; the other end of capacitor C19 is grounded; terminal 2 of CN2 is connected to terminal 7 of the driver chip U3; terminal 3 of CN2 is connected to terminal 8 of the driver chip U3; terminal 4 of CN2 is connected to terminal 9 of the driver chip U3; and terminal 5 of CN2 is connected to terminal 10 of the driver chip U3.

[0040] Furthermore, the brushless DC motor drive control circuit includes a resistor R20, the other end of which is connected to one end of a resistor R21, one end of a capacitor C10, and terminal 4 of chip Q1. The other end of the resistor R21 is connected to the output terminal 24V of the DC-DC Buck converter circuit and the other end of the capacitor C10 and terminal 3 of chip Q1.

[0041] The other end of resistor R22 is connected to one end of resistor R23, one end of capacitor C11, and terminal 2 of chip Q1, respectively. The other end of resistor R23 is connected to the other end of resistor R34 of phase current sampling circuit, the other end of capacitor C11, and terminal 1 of chip Q1, respectively.

[0042] The other end of resistor R24 ​​is connected to one end of resistor R25, one end of capacitor C12, and terminal 4 of chip Q2. The other end of resistor R25 is connected to the output terminal 24V of DC-DC Buck converter circuit, the other end of capacitor C12, and terminal 3 of chip Q2.

[0043] The other end of resistor R26 is connected to one end of resistor R27, one end of capacitor C13, and terminal 2 of chip Q2, respectively. The other end of resistor R27 is connected to the other end of resistor R32 of phase current sampling circuit, the other end of capacitor C13, and terminal 1 of chip Q2, respectively.

[0044] The other end of resistor R28 is connected to one end of resistor R29, one end of capacitor C14, and terminal 4 of chip Q3. The other end of resistor R29 is connected to the output terminal 24V of DC-DC Buck converter circuit, the other end of capacitor C14, and terminal 3 of chip Q3.

[0045] The other end of resistor R30 is connected to one end of resistor R31, one end of capacitor C15, and terminal 2 of chip Q3. The other end of resistor R31 is connected to the other end of resistor R35 of phase current sampling circuit, the other end of capacitor C15, and terminal 1 of chip Q3.

[0046] Furthermore, the phase current amplification circuit includes a resistor R39, one end of which is connected to the other end of a resistor R34, one end of a resistor R38 is connected to the other end of a resistor R32, the other end of a resistor R38 is connected to the other end of a resistor R39 and one end of a resistor R37, and the other end of a resistor R37 is grounded.

[0047] The beneficial effects of this utility model are:

[0048] This utility model features an integrated and optimized circuit design with strong compatibility, improved stability of the control circuit, and a shared 5V circuit for the main control MCU and peripheral auxiliary circuits. This also reduces material costs and facilitates procurement, workshop production, and back-end maintenance. Attached Figure Description

[0049] Figure 1 This is a block diagram of the present invention.

[0050] Figure 2 This is the circuit diagram of the host computer main control MCU of this utility model.

[0051] Figure 3 This is the circuit diagram of the DC-DC Buck converter of this utility model.

[0052] Figure 4 This is the buzzer driver circuit diagram of this utility model.

[0053] Figure 5 This is the touch sensing circuit diagram of this utility model.

[0054] Figure 6 This is the circuit diagram of the LED indicator light of this utility model.

[0055] Figure 7 This is the RF receiver circuit diagram of this utility model.

[0056] Figure 8 This is the circuit diagram of the motor drive main control MCU of this utility model.

[0057] Figure 9 This is a stepper motor drive control circuit diagram of this utility model.

[0058] Figure 10 This is a circuit diagram of the brushless DC motor drive control of this utility model.

[0059] Figure 11 This is the phase current sampling circuit diagram of this utility model.

[0060] Figure 12 This is the phase current amplifier circuit diagram of this utility model.

[0061] Figure 13 This is a circuit diagram for bus voltage detection of this utility model.

[0062] Figure 14 This is the hardware overcurrent detection circuit diagram of this utility model.

[0063] Figure 15 This is the circuit diagram of the programming interface of this utility model. Detailed Implementation

[0064] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0065] A low-voltage fan integrated drive control circuit, wherein the host computer drive control system includes a buzzer drive circuit, a touch sensing circuit, a host computer main control MCU, an RF receiving circuit, and an LED indicator circuit;

[0066] The host computer's main control MCU is connected to the buzzer driver circuit, touch sensing circuit, RF receiver circuit, and LED indicator circuit, respectively.

[0067] The motor drive control system includes a hardware overcurrent detection circuit, a bus voltage detection circuit, a motor main control MCU programming interface, a motor drive main control MCU, a stepper motor drive control circuit, a brushless DC motor drive control circuit, a phase current sampling circuit, and a phase current amplification circuit.

[0068] The motor drive main control MCU is connected to the hardware overcurrent detection circuit, the bus voltage detection circuit, the motor main control MCU programming interface, the stepper motor drive control circuit, and the brushless DC motor drive control circuit, respectively.

[0069] The brushless DC motor drive control circuit is connected to the phase current sampling circuit and the phase current amplification circuit, respectively.

[0070] The host computer main control MCU, stepper motor drive control circuit, brushless DC motor drive control circuit, and motor drive main control MCU are all connected to the DC-DC Buck converter circuit.

[0071] Furthermore, the DC-DC Buck converter circuit includes a chip U2. Terminal 1 of the chip U2 is connected to the positive terminal of capacitor CAP2, the negative terminal of Zener diode TVS1, the positive terminal of capacitor CAP1, one end of capacitor C1, the output terminal 24V, and terminal 1 of high-voltage load switch CN3. Terminal 2 of the chip U2 is connected to the negative terminal of capacitor CAP2, the positive terminal of Zener diode TVS1, the negative terminal of capacitor CAP1, the other end of capacitor C1, and terminal 2 of high-voltage load switch CN3, and then grounded. Terminal 5 of the chip U2 is connected to one end of inductor L3. The other end of inductor L3 is connected to terminal 4 of the chip U2, the positive terminal of capacitor CAP3, one end of capacitor C1, and VDD5. The negative terminal of capacitor CAP3 is connected to the other end of capacitor C2 and then grounded.

[0072] The bus voltage detection circuit is connected to the 24V output terminal of the DC-DC Buck converter circuit. The 24V output terminal is connected to one end of resistor R7. The other end of resistor R7 is connected to one end of resistor R8 and one end of resistor R9. The other end of resistor R8 is connected to terminal 6 of chip U4 and one end of capacitor C3. The other end of resistor R9 is connected to the other end of capacitor C3 and then grounded.

[0073] Furthermore, the host computer main control MCU includes a chip U6, with terminal 1 of the chip U6 connected to one end of capacitor C29 and the ground terminal, and the other end of capacitor C29 connected to terminal 20 of the chip U6 and the VDD5 terminal.

[0074] Terminal 3 of chip U6 is connected to one end of resistor R40 in the LED indicator circuit, and the other end of resistor R40 is connected to the negative terminal of LED1.

[0075] Terminal 4 of chip U6 is connected to one end of resistor R41 in the LED indicator circuit, and the other end of resistor R41 is connected to the negative terminal of LED2.

[0076] Terminal 5 of chip U6 is connected to one end of resistor R42 in the LED indicator circuit, and the other end of resistor R42 is connected to the negative terminal of LED3.

[0077] Terminal 6 of chip U6 is connected to one end of resistor R43 in the LED indicator circuit, and the other end of resistor R43 is connected to the negative terminal of LED4.

[0078] Terminal 7 of chip U6 is connected to one end of resistor R44 in the LED indicator circuit, and the other end of resistor R44 is connected to the negative terminal of LED5.

[0079] Terminal 8 of chip U6 is connected to one end of resistor R45 in the LED indicator circuit, and the other end of resistor R45 is connected to the negative terminal of LED6.

[0080] The positive terminal of LED1 is connected to the positive terminals of LED2, LED3, LED4, LED5, and LED6, and the VDD5 terminal, respectively.

[0081] Terminal 9 of chip U6 is connected to one end of resistor R48 in the touch sensing circuit, and the other end of resistor R48 is connected to touch terminal K4. Terminal 10 of chip U6 is connected to one end of resistor R49 in the touch sensing circuit, and the other end of resistor R49 is connected to touch terminal K3. Terminal 11 of chip U6 is connected to one end of resistor R46 in the touch sensing circuit, and the other end of resistor R46 is connected to touch terminal K2. Terminal 14 of chip U6 is connected to one end of resistor R47 in the touch sensing circuit, and the other end of resistor R47 is connected to touch terminal K1.

[0082] The chip U6 is grounded after being connected in series with capacitor C21 at terminal 12.

[0083] Terminal 16 of the chip U6 is connected to the buzzer driver circuit;

[0084] Terminal 17 of the chip U6 is connected to the RF receiving circuit;

[0085] Terminal 18 of chip U6 is connected to terminal 21 of chip U4, and terminal 19 of chip U6 is connected to terminal 20 of chip U4.

[0086] Furthermore, the buzzer driving circuit includes a resistor R50. One end of the resistor R50 is connected to terminal 1 of transistor Q4 and one end of resistor R51. The other end of the resistor R51 is connected to terminal 2 of transistor Q4 and then grounded. Terminal 3 of transistor Q4 is connected to one end of buzzer BZ1 and the positive terminal of diode D1. The other end of buzzer BZ1 is connected to one end of resistor R55 and the negative terminal of diode D1. The other end of resistor R55 is connected to VDD5.

[0087] Furthermore, the RF receiving circuit includes a chip U5. Terminal 1 of the chip U5 is connected to one end of inductor L2, one end of inductor L1, and one end of capacitor C26, and then grounded. Terminal 2 of the chip U5 is connected to one end of capacitor C25 and the other end of inductor L2. The other end of capacitor C25 is connected to one end of inductor L1, the other end of capacitor C26, and ANT1.

[0088] Terminal 3 of chip U5 is connected to one end of capacitor C22, one end of capacitor C23, one end of capacitor C24 and VDD5 respectively. The other end of capacitor C22 is connected to the other end of capacitor C23 and the other end of capacitor C24 respectively and then grounded.

[0089] Terminal 5 of chip U5 is connected to one end of resistor R5. The other end of resistor R5 is connected to one end of capacitor C28 and terminal 17 of chip U6. The other end of capacitor C28 is connected to terminal 6 of chip U5. Terminal 7 of chip U5 is connected to one end of capacitor C27. Terminal 8 of chip U5 is connected to terminal 1 of crystal oscillator Y1. The other end of capacitor C27 is connected to the other end of capacitor C28 and terminal 2 of crystal oscillator Y1, and then grounded.

[0090] Furthermore, the motor drive main control MCU includes a chip U4. Terminal 1 of chip U4 is connected to one end of capacitor C4, terminal 7 of chip U4, one end of capacitor C5, and terminal VDD5. The other end of capacitor C4 is grounded, and the other end of capacitor C5 is also grounded. Terminal 8 of chip U4 is connected to one end of capacitor C6, one end of capacitor C7, and the DC-DC converter. The output terminal of the Buck converter circuit is connected to 24V. The other end of capacitor C6 is connected to the other end of capacitor C7 and then grounded. Terminal 24 of chip U4 is connected to ground in series with capacitor C8. Terminal 5 of chip U4 is connected to the hardware overcurrent detection circuit. Terminal 6 of chip U4 is connected to the bus voltage detection circuit. Terminal 9 of chip U4 is connected to one end of resistor R20 of the brushless DC motor drive control circuit. Terminal 10 of chip U4 is connected to one end of resistor R22 of the brushless DC motor drive control circuit. Terminal 11 of chip U4 is connected to one end of resistor R24 ​​of the brushless DC motor drive control circuit. Terminal 12 of chip U4 is connected to one end of resistor R26 of the brushless DC motor drive control circuit. Terminal 13 of chip U4 is connected to one end of resistor R28 of the brushless DC motor drive control circuit. Terminal 14 of chip U4 is connected to one end of resistor R30 of the brushless DC motor drive control circuit.

[0091] Terminal 16 of chip U4 is connected to one end of resistor R34 and one end of capacitor C18 in the phase current amplifier circuit; terminal 17 of chip U4 is connected to one end of resistor R35 and the other end of capacitor C18 in the phase current amplifier circuit; terminal 18 of chip U4 is connected to one end of resistor R32 and one end of capacitor C17 in the phase current amplifier circuit; and terminal 19 of chip U4 is connected to one end of resistor R35 and one end of capacitor C17 in the phase current amplifier circuit.

[0092] Pin 19 of the chip U4 is connected to one end of resistor R1 in the stepper motor drive control circuit and pin 4 of the motor main control MCU programming interface.

[0093] Terminal 2 of the chip U4 is connected to one end of resistor R2 in the stepper motor drive control circuit.

[0094] Terminal 3 of the chip U4 is connected to one end of resistor R3 in the stepper motor drive control circuit.

[0095] Terminal 4 of the chip U4 is connected to one end of resistor R4 in the stepper motor drive control circuit.

[0096] The 23rd terminal of the chip U4 is connected to the 3rd terminal of the motor main control MCU programming interface.

[0097] Furthermore, the hardware overcurrent detection circuit includes a resistor R52. One end of the resistor R52 is connected to terminal 5 of chip U4, one end of resistor R53, one end of resistor R54, and one end of capacitor C16. The other end of the resistor R52 is connected to the phase current amplifier circuit. The other end of the resistor R53 is connected to VDD5. The other end of the resistor R54 is connected to the other end of capacitor C16 and then grounded.

[0098] The bus voltage detection circuit includes a resistor R8. One end of the resistor R8 is connected to terminal 5 of the chip U4 and one end of the capacitor C3. The other end of the resistor R8 is connected to one end of the resistor R7 and one end of the resistor R9. The other end of the resistor R7 is connected to the 24V output terminal of the DC-DC Buck converter circuit. The other end of the resistor R9 is connected to the other end of the capacitor C3 and then grounded.

[0099] Furthermore, the stepper motor drive control circuit includes a resistor R1, the other end of which is connected to terminal 4 of the driver chip U3; the other end of the resistor R2 is connected to terminal 3 of the driver chip U3; the other end of the resistor R3 is connected to terminal 2 of the driver chip U3; the other end of the resistor R4 is connected to terminal 1 of the driver chip U3; terminal 5 of the driver chip U3 is connected to one end of capacitor C20 and then grounded; the other end of capacitor C20 is connected to terminal 6 of the driver chip U3, one end of capacitor C19, terminal 1 of CN2, and the 24V output terminal of the DC-DC Buck converter circuit; the other end of capacitor C19 is grounded; terminal 2 of CN2 is connected to terminal 7 of the driver chip U3; terminal 3 of CN2 is connected to terminal 8 of the driver chip U3; terminal 4 of CN2 is connected to terminal 9 of the driver chip U3; and terminal 5 of CN2 is connected to terminal 10 of the driver chip U3.

[0100] The further brushless DC motor drive control circuit includes a resistor R20, the other end of which is connected to one end of a resistor R21, one end of a capacitor C10, and terminal 4 of chip Q1. The other end of the resistor R21 is connected to the output terminal 24V of the DC-DC Buck converter circuit and the other end of the capacitor C10 and terminal 3 of chip Q1.

[0101] The other end of resistor R22 is connected to one end of resistor R23, one end of capacitor C11, and terminal 2 of chip Q1, respectively. The other end of resistor R23 is connected to the other end of resistor R34 of phase current sampling circuit, the other end of capacitor C11, and terminal 1 of chip Q1, respectively.

[0102] The other end of resistor R24 ​​is connected to one end of resistor R25, one end of capacitor C12, and terminal 4 of chip Q2. The other end of resistor R25 is connected to the output terminal 24V of DC-DC Buck converter circuit, the other end of capacitor C12, and terminal 3 of chip Q2.

[0103] The other end of resistor R26 is connected to one end of resistor R27, one end of capacitor C13, and terminal 2 of chip Q2, respectively. The other end of resistor R27 is connected to the other end of resistor R32 of phase current sampling circuit, the other end of capacitor C13, and terminal 1 of chip Q2, respectively.

[0104] The other end of resistor R28 is connected to one end of resistor R29, one end of capacitor C14, and terminal 4 of chip Q3. The other end of resistor R29 is connected to the output terminal 24V of DC-DC Buck converter circuit, the other end of capacitor C14, and terminal 3 of chip Q3.

[0105] The other end of resistor R30 is connected to one end of resistor R31, one end of capacitor C15, and terminal 2 of chip Q3. The other end of resistor R31 is connected to the other end of resistor R35 of phase current sampling circuit, the other end of capacitor C15, and terminal 1 of chip Q3.

[0106] Furthermore, the phase current amplification circuit includes a resistor R39, one end of which is connected to the other end of a resistor R34, one end of a resistor R38 is connected to the other end of a resistor R32, the other end of a resistor R38 is connected to the other end of a resistor R39 and one end of a resistor R37, and the other end of a resistor R37 is grounded.

[0107] The motor drive main control MCU is responsible for driving the three-phase brushless DC motor of the fan, controlling the stepper motor of the fan oscillating head to drive the directional angle, receiving wireless RF remote control signals, and communicating with the host computer control board MCU.

[0108] The fan motor's drive modulation method adopts sensorless field vector control (FOC), which has advantages such as high operating efficiency, low noise, and stable output torque. The main control MCU estimates the motor's current position by collecting information such as the motor's bus voltage and phase current, and controls the amplitude and frequency of the inverter's output voltage to accurately control the motor's operation. The motor system's protection functions include: hardware overcurrent protection, software overcurrent protection, sampling error protection, undervoltage protection, overvoltage protection, phase loss protection, stall protection, start-up protection, maximum speed and minimum speed monitoring protection, and maximum output power limiting protection. The main control MCU controls the motor's direction of rotation by controlling the direction of the conduction current in the stator's U, V, and W phases.

[0109] The host computer's main control MCU monitors the changes in the levels of K1, K2, K3, and K4, and according to the logic set in the software, sends commands such as fan start-up, speed adjustment, oscillation, and timing to the motor drive main control MCU through the serial communication port. At the same time, the corresponding LED indicator circuit is turned on to indicate the corresponding working status of the fan, and the buzzer sounds to indicate that the software command processing is complete.

[0110] This control circuit is suitable for 12 or 24V floor fans, circulating fans, table fans, and other fan applications.

[0111] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A low-voltage fan integrated drive control circuit, characterized in that, The host computer drive control system includes a buzzer drive circuit, a touch sensing circuit, a host computer main control MCU, an RF receiving circuit, and an LED indicator circuit. The host computer's main control MCU is connected to the buzzer driver circuit, touch sensing circuit, RF receiver circuit, and LED indicator circuit, respectively. The motor drive control system includes a hardware overcurrent detection circuit, a bus voltage detection circuit, a motor main control MCU programming interface, a motor drive main control MCU, a stepper motor drive control circuit, a brushless DC motor drive control circuit, a phase current sampling circuit, and a phase current amplification circuit. The motor drive main control MCU is connected to the hardware overcurrent detection circuit, the bus voltage detection circuit, the motor main control MCU programming interface, the stepper motor drive control circuit, and the brushless DC motor drive control circuit, respectively. The brushless DC motor drive control circuit is connected to the phase current sampling circuit and the phase current amplification circuit, respectively. Both the host computer main control MCU and the motor drive main control MCU are connected to the DC-DC Buck conversion circuit.

2. The low-voltage fan integrated drive control circuit according to claim 1, characterized in that, The DC-DCBuck converter circuit includes a chip U2. Terminal 1 of chip U2 is connected to the positive terminal of capacitor CAP2, the negative terminal of Zener diode TVS1, the positive terminal of capacitor CAP1, one end of capacitor C1, the 24V output terminal, and terminal 1 of high-voltage load switch CN3. Terminal 2 of chip U2 is connected to the negative terminal of capacitor CAP2, the positive terminal of Zener diode TVS1, the negative terminal of capacitor CAP1, the other end of capacitor C1, and terminal 2 of high-voltage load switch CN3, and then grounded. Terminal 5 of chip U2 is connected to one end of inductor L3. The other end of inductor L3 is connected to terminal 4 of chip U2, the positive terminal of capacitor CAP3, one end of capacitor C1, and VDD5. The negative terminal of capacitor CAP3 is connected to the other end of capacitor C2 and then grounded. The bus voltage detection circuit is connected to the 24V output terminal of the DC-DC Buck converter circuit. The 24V output terminal is connected to one end of resistor R7. The other end of resistor R7 is connected to one end of resistor R8 and one end of resistor R9. The other end of resistor R8 is connected to terminal 6 of chip U4 and one end of capacitor C3. The other end of resistor R9 is connected to the other end of capacitor C3 and then grounded.

3. The low-voltage fan integrated drive control circuit according to claim 2, characterized in that, The host computer main control MCU includes a chip U6. Terminal 1 of the chip U6 is connected to one end of capacitor C29 and the ground terminal, respectively. The other end of capacitor C29 is connected to terminal 20 of the chip U6 and the VDD5 terminal, respectively. Terminal 3 of chip U6 is connected to one end of resistor R40 in the LED indicator circuit, and the other end of resistor R40 is connected to the negative terminal of LED1. Terminal 4 of chip U6 is connected to one end of resistor R41 in the LED indicator circuit, and the other end of resistor R41 is connected to the negative terminal of LED2. Terminal 5 of chip U6 is connected to one end of resistor R42 in the LED indicator circuit, and the other end of resistor R42 is connected to the negative terminal of LED3. Terminal 6 of chip U6 is connected to one end of resistor R43 in the LED indicator circuit, and the other end of resistor R43 is connected to the negative terminal of LED4. Terminal 7 of chip U6 is connected to one end of resistor R44 in the LED indicator circuit, and the other end of resistor R44 is connected to the negative terminal of LED5. Terminal 8 of chip U6 is connected to one end of resistor R45 in the LED indicator circuit, and the other end of resistor R45 is connected to the negative terminal of LED6. The positive terminal of LED1 is connected to the positive terminals of LED2, LED3, LED4, LED5, and LED6, and the VDD5 terminal, respectively. Terminal 9 of chip U6 is connected to one end of resistor R48 in the touch sensing circuit, and the other end of resistor R48 is connected to touch terminal K4. Terminal 10 of chip U6 is connected to one end of resistor R49 in the touch sensing circuit, and the other end of resistor R49 is connected to touch terminal K3. Terminal 11 of chip U6 is connected to one end of resistor R46 in the touch sensing circuit, and the other end of resistor R46 is connected to touch terminal K2. Terminal 14 of chip U6 is connected to one end of resistor R47 in the touch sensing circuit, and the other end of resistor R47 is connected to touch terminal K1. The chip U6 is grounded after being connected in series with capacitor C21 at terminal 12. Terminal 16 of the chip U6 is connected to the buzzer driver circuit; Terminal 17 of the chip U6 is connected to the RF receiving circuit; Terminal 18 of chip U6 is connected to terminal 21 of chip U4, and terminal 19 of chip U6 is connected to terminal 20 of chip U4.

4. The low-voltage fan integrated drive control circuit according to claim 3, characterized in that, The buzzer driver circuit includes a resistor R50. One end of the resistor R50 is connected to terminal 1 of transistor Q4 and one end of resistor R51. The other end of the resistor R51 is connected to terminal 2 of transistor Q4 and then grounded. Terminal 3 of transistor Q4 is connected to one end of buzzer BZ1 and the positive terminal of diode D1. The other end of buzzer BZ1 is connected to one end of resistor R55 and the negative terminal of diode D1. The other end of resistor R55 is connected to VDD5.

5. The low-voltage fan integrated drive control circuit according to claim 1, characterized in that, The RF receiving circuit includes a chip U5. Terminal 1 of the chip U5 is connected to one end of inductor L2, one end of inductor L1, and one end of capacitor C26, and then grounded. Terminal 2 of the chip U5 is connected to one end of capacitor C25 and the other end of inductor L2. The other end of capacitor C25 is connected to one end of inductor L1, the other end of capacitor C26, and ANT1. Terminal 3 of chip U5 is connected to one end of capacitor C22, one end of capacitor C23, one end of capacitor C24 and VDD5 respectively. The other end of capacitor C22 is connected to the other end of capacitor C23 and the other end of capacitor C24 respectively and then grounded. Terminal 5 of chip U5 is connected to one end of resistor R5. The other end of resistor R5 is connected to one end of capacitor C28 and terminal 17 of chip U6. The other end of capacitor C28 is connected to terminal 6 of chip U5. Terminal 7 of chip U5 is connected to one end of capacitor C27. Terminal 8 of chip U5 is connected to terminal 1 of crystal oscillator Y1. The other end of capacitor C27 is connected to the other end of capacitor C28 and terminal 2 of crystal oscillator Y1, and then grounded.

6. The low-voltage fan integrated drive control circuit according to claim 1, characterized in that, The motor drive main control MCU includes chip U4. Terminal 1 of chip U4 is connected to one end of capacitor C4, terminal 7 of chip U4, one end of capacitor C5, and VDD5. The other end of capacitor C4 and capacitor C5 are grounded. Terminal 8 of chip U4 is connected to one end of capacitor C6, one end of capacitor C7, and DC-DC converter. The output terminal of the Buck converter circuit is connected to 24V. The other end of capacitor C6 is connected to the other end of capacitor C7 and then grounded. Terminal 24 of chip U4 is connected to ground in series with capacitor C8. Terminal 5 of chip U4 is connected to the hardware overcurrent detection circuit. Terminal 6 of chip U4 is connected to the bus voltage detection circuit. Terminal 9 of chip U4 is connected to one end of resistor R20 of the brushless DC motor drive control circuit. Terminal 10 of chip U4 is connected to one end of resistor R22 of the brushless DC motor drive control circuit. Terminal 11 of chip U4 is connected to one end of resistor R24 ​​of the brushless DC motor drive control circuit. Terminal 12 of chip U4 is connected to one end of resistor R26 of the brushless DC motor drive control circuit. Terminal 13 of chip U4 is connected to one end of resistor R28 of the brushless DC motor drive control circuit. Terminal 14 of chip U4 is connected to one end of resistor R30 of the brushless DC motor drive control circuit. Terminal 16 of chip U4 is connected to one end of resistor R34 and one end of capacitor C18 in the phase current amplifier circuit; terminal 17 of chip U4 is connected to one end of resistor R35 and the other end of capacitor C18 in the phase current amplifier circuit; terminal 18 of chip U4 is connected to one end of resistor R32 and one end of capacitor C17 in the phase current amplifier circuit; and terminal 19 of chip U4 is connected to one end of resistor R35 and one end of capacitor C17 in the phase current amplifier circuit. Pin 19 of the chip U4 is connected to one end of resistor R1 in the stepper motor drive control circuit and pin 4 of the motor main control MCU programming interface. Terminal 2 of the chip U4 is connected to one end of resistor R2 in the stepper motor drive control circuit. Terminal 3 of the chip U4 is connected to one end of resistor R3 in the stepper motor drive control circuit. Terminal 4 of the chip U4 is connected to one end of resistor R4 in the stepper motor drive control circuit. The 23rd terminal of the chip U4 is connected to the 3rd terminal of the motor main control MCU programming interface.

7. The low-voltage fan integrated drive control circuit according to claim 5, characterized in that, The hardware overcurrent detection circuit includes a resistor R52. One end of the resistor R52 is connected to terminal 5 of chip U4, one end of resistor R53, one end of resistor R54, and one end of capacitor C16. The other end of the resistor R52 is connected to the phase current amplifier circuit. The other end of the resistor R53 is connected to VDD5. The other end of the resistor R54 is connected to the other end of capacitor C16 and then grounded. The bus voltage detection circuit includes a resistor R8. One end of the resistor R8 is connected to terminal 5 of the chip U4 and one end of the capacitor C3. The other end of the resistor R8 is connected to one end of the resistor R7 and one end of the resistor R9. The other end of the resistor R7 is connected to the 24V output terminal of the DC-DC Buck converter circuit. The other end of the resistor R9 is connected to the other end of the capacitor C3 and then grounded.

8. The low-voltage fan integrated drive control circuit according to any one of claims 5 or 6, characterized in that, The stepper motor drive control circuit includes a resistor R1, the other end of which is connected to terminal 4 of the driver chip U3; the other end of the resistor R2 is connected to terminal 3 of the driver chip U3; the other end of the resistor R3 is connected to terminal 2 of the driver chip U3; the other end of the resistor R4 is connected to terminal 1 of the driver chip U3; terminal 5 of the driver chip U3 is connected to one end of capacitor C20 and then grounded; the other end of capacitor C20 is connected to terminal 6 of the driver chip U3, one end of capacitor C19, terminal 1 of CN2, and the 24V output terminal of the DC-DC Buck converter circuit; the other end of capacitor C19 is grounded; terminal 2 of CN2 is connected to terminal 7 of the driver chip U3; terminal 3 of CN2 is connected to terminal 8 of the driver chip U3; terminal 4 of CN2 is connected to terminal 9 of the driver chip U3; and terminal 5 of CN2 is connected to terminal 10 of the driver chip U3.

9. The low-voltage fan integrated drive control circuit according to claim 5, characterized in that, The brushless DC motor drive control circuit includes a resistor R20. The other end of the resistor R20 is connected to one end of a resistor R21, one end of a capacitor C10, and terminal 4 of the chip Q1. The other end of the resistor R21 is connected to the output terminal 24V of the DC-DC Buck converter circuit, the other end of the capacitor C10, and terminal 3 of the chip Q1. The other end of resistor R22 is connected to one end of resistor R23, one end of capacitor C11, and terminal 2 of chip Q1, respectively. The other end of resistor R23 is connected to the other end of resistor R34 of phase current sampling circuit, the other end of capacitor C11, and terminal 1 of chip Q1, respectively. The other end of resistor R24 ​​is connected to one end of resistor R25, one end of capacitor C12, and terminal 4 of chip Q2. The other end of resistor R25 is connected to the output terminal 24V of DC-DC Buck converter circuit, the other end of capacitor C12, and terminal 3 of chip Q2. The other end of resistor R26 is connected to one end of resistor R27, one end of capacitor C13, and terminal 2 of chip Q2, respectively. The other end of resistor R27 is connected to the other end of resistor R32 of phase current sampling circuit, the other end of capacitor C13, and terminal 1 of chip Q2, respectively. The other end of resistor R28 is connected to one end of resistor R29, one end of capacitor C14, and terminal 4 of chip Q3. The other end of resistor R29 is connected to the output terminal 24V of DC-DC Buck converter circuit, the other end of capacitor C14, and terminal 3 of chip Q3. The other end of resistor R30 is connected to one end of resistor R31, one end of capacitor C15, and terminal 2 of chip Q3. The other end of resistor R31 is connected to the other end of resistor R35 of phase current sampling circuit, the other end of capacitor C15, and terminal 1 of chip Q3.

10. The low-voltage fan integrated drive control circuit according to claim 9, characterized in that, The phase current amplification circuit includes a resistor R39, one end of which is connected to the other end of a resistor R34, one end of a resistor R38 is connected to the other end of a resistor R32, the other end of a resistor R38 is connected to the other end of a resistor R39 and one end of a resistor R37, and the other end of a resistor R37 is grounded.

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