CN220529487U - Control circuit for air duct - Google Patents
Control circuit for air duct Download PDFInfo
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- CN220529487U CN220529487U CN202321015858.6U CN202321015858U CN220529487U CN 220529487 U CN220529487 U CN 220529487U CN 202321015858 U CN202321015858 U CN 202321015858U CN 220529487 U CN220529487 U CN 220529487U
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Abstract
The utility model discloses a control circuit for an air duct, and belongs to the technical field of electronics. According to the control circuit for the air duct, an electromagnetic compatibility filtering unit is used for filtering impurity signals, and a rectifying circuit is used for converting alternating current signals into direct current signals; supplying power to the LED control circuit through the BUCK circuit; the PWM wave drives the brushless direct current motor through a power driving tube MOSFET in a power circuit of the brushless direct current motor; the control circuit of the heating wire is designed, and the power supply of the heating wire is normal or cut off through the switching on or cut off of the optocoupler, so that the running on-off is judged. The control circuit for the air duct is reasonable in design, overcomes the defects of poor protection condition and low air duct efficiency of the circuit in the prior art, and has the good effects of protecting the circuit and improving the air duct efficiency.
Description
Technical Field
The utility model belongs to the technical field of electronics, and particularly relates to a control circuit for an air duct.
Background
The household air duct is an electric appliance with higher use frequency in modern life, and the principle is that an impeller is driven by a motor in the air duct to rotate, so that external air is sucked into the air duct, and the external air is changed into hot air through an electric heating part and is sent out from a nozzle. The heated air is blown to the hair of a person at a certain speed and temperature after being guided by the air duct and the nozzle, thereby achieving the effects of drying and protecting the hair. The main constituent of hair is alpha-keratin, each hair consisting of epidermis, cortex and medulla. Mao Xiaopi is the outermost layer of hair and is usually composed of 2-4 layers of scales, namely 'hair scales', the hair scales are opened after the hair washing, the traditional air duct is mostly dried by hot air, and the high temperature can cause the hair fibers to be damaged and cause harmful effects such as scorching and yellowing. The air duct in the current market can realize the adjustment of the air-out cooling and heating of the air duct through controlling the electric heating component. Although the higher the temperature of the wind, the faster the water evaporates, the high temperature can rapidly dehydrate the hair, causing the hair to dry up and the hair scales to break, thereby causing hair damage.
The high-speed air duct has larger air quantity and a more accurate temperature control system, and low-temperature high-speed air is used for replacing high-temperature low-speed air, so that damage to hair caused by high temperature can be well reduced. However, when designing some air duct control circuits in the market, the protection measures are not good, such as lack of leakage protection device, incapability of automatic power-off protection due to abnormal electric appliance phenomenon, poor insulating property, lack of design safety consideration and the like, so that the safe use of the household air duct is seriously affected; because hair wires have positive charges, static electricity exists between the hair wires and the hair wires are easy to split, and the hair wires are easy to be frizzy and matted due to the air duct without the ionizer circuit, and the use experience is poor; meanwhile, an unreasonable control circuit is designed, and if the auxiliary circuit has large power consumption and overlarge dummy load current, the control circuit generates abnormal oscillation and other reasons, the circuit efficiency of the high-speed air duct can be reduced.
Disclosure of Invention
Aiming at the technical problems in the prior art, the utility model provides the control circuit for the air duct, overcomes the defects of the prior art, strengthens the design of the safety protection of the circuit, can adopt an ion hair care technology, such as arranging an ion generator circuit in the air duct, has reasonable design, greatly improves the working efficiency of the air duct, and has good effect of protecting the circuit.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
a control circuit for an air duct comprises an electromagnetic compatibility filtering unit, a rectifying circuit, a control power supply, a brushless direct current motor power circuit, a brushless direct current motor, a heating wire control circuit and an MCU;
the electromagnetic compatibility filtering unit, the rectifying circuit and the control power supply are sequentially connected through lines;
the electromagnetic compatibility filtering unit, the rectifying circuit, the brushless direct current motor power circuit and the brushless direct current motor are sequentially connected through a circuit;
the mains supply and electromagnetic compatibility filtering unit is connected with the heating wire control circuit and supplies power to the heating wire control circuit;
the electromagnetic compatibility filtering unit is used for inhibiting and eliminating strong electromagnetic interference from commercial power;
the heating wire control circuit adjusts the power of the heating wire, so as to adjust the temperature under control;
the MCU is a control core unit of a control circuit for the air duct, and is connected with the control power supply to acquire control power consumption;
the MCU is connected with the brushless direct current motor power circuit, and sends PWM control waveforms to the brushless direct current motor power circuit;
the brushless direct current motor power circuit is connected with the brushless direct current motor, and the brushless direct current motor power circuit amplifies the received PWM control waveform and then transmits the amplified PWM control waveform to the brushless direct current motor for driving the motor to work.
Preferably, the electromagnetic compatibility filtering unit comprises a fuse, a piezoresistor, three resistors, a first capacitor and a transformer; the three resistors are respectively a first resistor, a second resistor and a third resistor; the second resistor and the third resistor are connected in series to form a series circuit, the series circuit is connected with the piezoresistor, the first capacitor and the transformer in parallel to form a parallel circuit, one end of the parallel circuit is connected with one end of the fuse, the other end of the parallel circuit is connected with one end of the first resistor, the other end of the fuse is connected with a live wire of alternating current, and the other end of the first resistor is connected with a zero wire of the alternating current.
Preferably, the rectifying circuit includes 4 rectifying diodes and a first electrolytic capacitor. The rectifier diodes are a first diode, a second diode, a third diode and a fourth diode respectively; the 4 rectifying diodes are in pairwise butt joint to form a bridge structure, the positive electrode of the first electrolytic capacitor is connected with the positive electrode of the bridge structure, and the negative electrode of the first electrolytic capacitor is grounded.
Preferably, the bus voltage sampling circuit comprises three resistors and a second capacitor; the fourth resistor, the fifth resistor and the sixth resistor are connected in series to form a series circuit, one end of the fourth resistor is connected with the voltage VBUS, and the other end of the sixth resistor is grounded; one end of the second capacitor, the other end of the sixth resistor and one end of the fifth resistor form a common end which is connected to the MCU, and the other end of the second capacitor is grounded.
Preferably, the device also comprises a temperature key control circuit, an air speed key control circuit, a cold air key circuit, an LED control circuit, an LED screen display circuit or an anion emission control circuit; the MCU is connected with the temperature key control circuit, the wind speed key control circuit, the cold air key circuit or the LED control circuit and used for controlling the temperature of the air duct, controlling the wind speed of the air duct, whether the heating wire works or whether the LED is powered; the MCU and the control power supply are respectively connected with the LED screen display circuit, and when the LED control circuit works, the LED screen display circuit displays the state data of the air duct in real time; the MCU is connected with the negative ion emission control circuit, and the commercial power is connected with and supplies power for the negative ion emission control circuit.
Preferably, the control power supply is a buck circuit, and the buck circuit comprises a buck control chip, a fifth diode, a sixth diode, a zener diode, an inductor, a second electrolytic capacitor and a third capacitor; the inductor and the second electrolytic capacitor form a low-pass filter; the cathode of the sixth diode, the third capacitor and the inductor form a common end and are simultaneously connected with a No. 1 pin and a No. 2 pin of the buck control chip; the other end of the third capacitor and the cathode of the fifth diode form a common end which is connected with a No. 4 pin of the buck control chip; the anode of the fifth diode, the other end of the inductor, the anode of the second electrolytic capacitor and the cathode of the voltage stabilizing diode form a common end to be connected, and the common end is output voltage; the anode of the sixth diode, the cathode of the second electrolytic capacitor and the anode of the zener diode are grounded; and the voltage of the VBUS is rectified and then reduced to 15V after passing through the BUCK BUCK circuit, so that the control circuit is powered.
Preferably, the brushless direct current motor power circuit comprises a power driving chip, a seventh diode, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourth capacitor, a fifth capacitor, a first MOS tube and a second MOS tube; the H_DU input signal is connected with the No. 2 pin of the power driving chip after being connected with the seventh resistor in series, and the L_DU input signal is connected with the No. 3 pin of the power driving chip after being connected with the eighth resistor in series; the anode of the seventh diode is connected with a ninth resistor, and the cathode of the seventh diode and the fifth capacitor are connected to form a common end which is connected to the No. 8 pin of the power driving chip; the No. 2 pin of the first MOS tube is connected with VBUS voltage, and the No. 1 pin of the first MOS tube is connected with the tenth resistor in series and then connected to the No. 7 pin of the power driving chip; two ends of the eleventh resistor are respectively connected with a No. 1 pin and a No. 3 pin of the first MOS tube; after the No. 1 pin of the second MOS tube is connected with the twelfth resistor in series, the second MOS tube is connected to the No. 5 pin of the power driving chip; the two ends of the thirteenth resistor are respectively connected with the No. 1 pin and the No. 3 pin of the second MOS tube, and the No. 3 pin of the second MOS tube is connected with one end of the thirteenth resistor and then grounded for protection; the other end of the fifth capacitor, the No. 3 pin of the first MOS tube, the No. 2 pin of the second MOS tube and the output signal OUT_U form a common end which is connected to the No. 6 pin of the power driving chip; one end of the fourth capacitor is connected with one end of the ninth resistor and the No. 1 pin of the power driving chip to form a common end, and is connected with 15V voltage; the other end of the fourth capacitor is connected with the No. 4 pin of the power driving chip and then grounded;
the input of the three-phase full-bridge inverter circuit which is formed by 6 MOS-FET tubes taking the power driving chip as the center is PWM wave taking power ground as ground, the PWM wave is transmitted to the input port of the power driving chip, and the brushless DC motor is driven by controlling the MOSFET of the power driving tube.
Preferably, the heating wire control circuit comprises a first optocoupler, three resistors, a heating wire and a triac; the three resistors are respectively a fourteenth resistor, a fifteenth resistor and a sixteenth resistor; the fourteenth resistor is connected in parallel between the port 1 and the port 2 of the first optocoupler, the output end port 1 of the first optocoupler is connected to VCC, and the port 2 of the first optocoupler is connected with one end of the fifteenth resistor; the port 3 and the port 4 of the output end of the first optocoupler are respectively connected to the port 3 of the triac and one end of the sixteenth resistor, the port 2 of the triac and the other end of the sixteenth resistor form a common end and are connected to one end of the heating wire, the other end of the heating wire is connected to a live wire of the alternating current, and the port 1 of the triac is connected to a zero line of the alternating current.
Preferably, the negative ion emission control circuit comprises a second optocoupler, a negative ion generator and two resistors; the two resistors are a seventeenth resistor and an eighteenth resistor respectively; the eighteenth resistor is connected in parallel between the port 1 and the port 2 of the second optocoupler, and the port 1 and the port 2 of the input end of the second optocoupler are respectively connected to one ends of the VCC and the seventeenth resistor; the port 3 of the output end of the second optical coupler is connected to one end of the negative ion generator, the port 4 of the output end of the second optical coupler is connected to the live wire of the alternating current, and the other end of the negative ion generator is connected to the zero wire of the alternating current.
Preferably, the device further comprises a voltage sampling circuit, wherein the voltage sampling circuit is connected with the rectifying circuit and the MCU, acquires voltage information in the rectifying circuit, and outputs the voltage information to the MCU after sampling and conditioning; the current sampling circuit is connected with the brushless direct current motor power circuit and the MCU, acquires current information from the brushless direct current motor power circuit, and outputs the current information to the MCU after sampling and conditioning; the temperature sampling circuit is connected with the heating wire control circuit and the MCU, acquires temperature information from the electric heating wire control circuit, and outputs the temperature information to the MCU after sampling and conditioning.
The utility model has the beneficial technical effects that:
according to the control circuit for the air duct, an electromagnetic compatibility filtering unit is used for filtering impurity signals, and a rectifying circuit is used for converting alternating current signals into direct current signals; the VBUS voltage is reduced to 15V through the BUCK circuit, and the LED control circuit is powered; the power circuit of the brushless direct current motor is a three-phase full-bridge inverter circuit which is composed of 6N-channel MOS-FET tubes taking a power driving chip as the center, the input of the three-phase full-bridge inverter circuit is PWM waves taking power ground as the ground, the PWM waves are transmitted to an input port of the power driving chip, and the brushless direct current motor is driven by controlling the N-channel power driving tube MOSFET.
The control circuit of the utility model strengthens the design of circuit safety protection, designs the control circuit of the heating wire, when the control signal is at a low level, the optocoupler is conducted, the heating wire is powered normally, and the operation is started; when the control signal is at a high level, the optocoupler is cut off, the heating wire is disconnected from power supply, and the operation is stopped. The circuit has a more accurate temperature control system, and the hair is dried by low-temperature high-speed wind, so that the damage of high temperature to the hair is well reduced.
The control circuit is provided with a negative ion emission control circuit, adopts an ion hair care technology, is internally provided with an ion generator circuit, and when a control signal is at a low level, the optocoupler is conducted, and the negative ion generator is powered normally and starts to operate; when the Control signal 02Control is at a high level, the optocoupler is cut off, and the negative ion generator is powered off to stop running. The negative ions are utilized to neutralize the positive charges carried by the hair to promote repair, and after the hair conditioner is used, the hair can be moisturized, so that the effects of tightening hair scales and smoothing hair mania are achieved. The control circuit has reasonable design, and greatly improves the efficiency of the air duct.
Drawings
FIG. 1 is a control block diagram of a dryer circuit.
Fig. 2 is a schematic diagram of an electromagnetic compatibility filter unit.
Fig. 3 is a schematic diagram of a rectifier circuit.
Fig. 4 is a schematic diagram of a bus voltage sampling circuit.
Fig. 5 is a schematic diagram of a control power supply.
Fig. 6 is a schematic diagram of a brushless dc motor power circuit.
Fig. 7 is a schematic diagram of a heater wire control circuit.
Fig. 8 is a negative ion emission control circuit.
Detailed Description
The utility model is described in further detail below with reference to the attached drawings and detailed description:
as shown in fig. 1, the control circuit for the air duct comprises an electromagnetic compatibility filtering unit, a rectifying circuit, a control power supply, an LED screen display circuit, a voltage sampling circuit, a brushless direct current motor power circuit, a current sampling circuit, a brushless direct current motor, an MCU, a heating wire control circuit, a temperature sampling circuit, an anion emission control circuit, a temperature key control circuit, an air speed key control circuit, a cold air key circuit and an LED control circuit.
The electromagnetic compatibility filtering unit, the rectifying circuit, the control power supply and the LED screen display circuit are sequentially connected through lines.
The electromagnetic compatibility filtering unit, the rectifying circuit, the brushless direct current motor power circuit and the brushless direct current motor are sequentially connected through lines.
The electromagnetic compatibility filtering unit is respectively connected with the heating wire control circuit and the negative ion emission control circuit through lines.
The rectification circuit is connected with the voltage sampling circuit through a circuit.
The MCU, the brushless direct current motor power circuit and the current sampling circuit are sequentially connected through lines.
MCU, heater strip control circuit, temperature sampling circuit are connected in proper order through the circuit.
The MCU is respectively connected with the voltage sampling circuit, the control power supply, the LED screen display circuit, the negative ion emission control circuit, the temperature key control circuit, the wind speed key control circuit, the cold air key circuit and the LED control circuit through circuits.
As shown in fig. 2, the electromagnetic compatible filtering unit comprises a fuse, a piezoresistor, three resistors, a first capacitor and a transformer; the three resistors are respectively a first resistor, a second resistor and a third resistor; the second resistor and the third resistor are connected in series to form a series circuit, the series circuit is connected with the piezoresistor, the first capacitor and the transformer in parallel to form a parallel circuit, one end of the parallel circuit is connected with one end of the fuse, the other end of the parallel circuit is connected with one end of the first resistor, the other end of the fuse is connected with a live wire of alternating current, and the other end of the first resistor is connected with a zero wire of the alternating current. The piezoresistor plays a role in preventing surge voltage.
As shown in fig. 3, the number of rectifying diodes is 4, namely a first diode, a second diode, a third diode and a fourth diode; the 4 rectifying diodes are in pairwise butt joint to form a bridge structure, the positive electrode of the first electrolytic capacitor is connected with the positive electrode of the bridge structure, and the negative electrode of the first electrolytic capacitor is grounded.
As shown in fig. 4, the bus voltage sampling circuit includes three resistors and a second capacitor, and the three resistors are named as a fourth resistor, a fifth resistor and a sixth resistor in turn from top to bottom; the fourth resistor, the fifth resistor and the sixth resistor are connected in series to form a series circuit, one end of the fourth resistor is connected with the voltage VBUS, and the other end of the sixth resistor is grounded; one end of the second capacitor, the other end of the sixth resistor and one end of the fifth resistor form a common end which is connected to the MCU, and the other end of the second capacitor is grounded.
And the bus voltage sampling circuit is used for obtaining small signal voltage after voltage division through the voltage division of a plurality of resistors, and sampling the small signal voltage by the MCU. The MCU is provided with a voltage division ratio, and the bus voltage can be obtained after calculation.
As shown in FIG. 5, the control power supply is a BUCK circuit, namely a BUCK circuit, and the BUCK circuit comprises a BUCK control chip, two common diodes, namely a fifth diode, a sixth diode, a voltage stabilizing diode, an inductor, a second electrolytic capacitor and a third capacitor; the inductor and the second electrolytic capacitor form a low-pass filter; the cathode of the sixth diode, the third capacitor and the inductor form a common end and are simultaneously connected with a No. 1 pin and a No. 2 pin of the buck control chip; the other end of the third capacitor and the cathode of the fifth diode form a common end which is connected with a No. 4 pin of the buck control chip; the anode of the fifth diode, the other end of the inductor, the anode of the second electrolytic capacitor and the cathode of the voltage stabilizing diode form a common end to be connected, and the common end is output voltage; the anode of the sixth diode, the cathode of the second electrolytic capacitor and the anode of the zener diode are grounded; and a common end is formed by connecting a No. 5 pin, a No. 6 pin, a No. 7 pin and a No. 8 pin of the buck control chip, and is connected with VBUS voltage.
The VBUS voltage is the rectified voltage, about 310V, is reduced to 15V after passing through the BUCK circuit, and supplies power to the control circuit.
As shown in fig. 6, the power circuit of the brushless dc motor includes a power driving chip, a seventh diode, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourth capacitor, a fifth capacitor, a first MOS transistor, and a second MOS transistor. The H_DU input signal is connected with the No. 2 pin of the power driving chip after being connected with the seventh resistor in series, and the L_DU input signal is connected with the No. 3 pin of the power driving chip after being connected with the eighth resistor in series; the anode of the seventh diode is connected with a ninth resistor, and the cathode of the seventh diode and the fifth capacitor are connected to form a common end which is connected to the No. 8 pin of the power driving chip; the No. 2 pin of the first MOS tube is connected with VBUS voltage, and the No. 1 pin of the first MOS tube is connected with the tenth resistor in series and then connected to the No. 7 pin of the power driving chip; two ends of the eleventh resistor are respectively connected with a No. 1 pin and a No. 3 pin of the first MOS tube; after the No. 1 pin of the second MOS tube is connected with the twelfth resistor in series, the second MOS tube is connected to the No. 5 pin of the power driving chip; the two ends of the thirteenth resistor are respectively connected with the No. 1 pin and the No. 3 pin of the second MOS tube, and the No. 3 pin of the second MOS tube is connected with one end of the thirteenth resistor and then grounded for protection; the other end of the fifth capacitor, the No. 3 pin of the first MOS tube, the No. 2 pin of the second MOS tube and the output signal OUT_U form a common end which is connected to the No. 6 pin of the power driving chip; one end of the fourth capacitor is connected with one end of the ninth resistor and the No. 1 pin of the power driving chip to form a common end, and is connected with 15V voltage; the other end of the fourth capacitor is connected with the No. 4 pin of the power driving chip and then grounded.
The power circuit of the brushless DC motor is a three-phase full-bridge inverter circuit which is composed of 6N-channel MOS-FET tubes taking a power driving chip as the center, the input of the three-phase full-bridge inverter circuit is PWM waves taking power ground as the ground, the PWM waves are transmitted to an input port of the power driving chip, and the brushless DC motor is driven by controlling the N-channel power driving tube MOSFET.
Taking a single-phase bridge as an example, the H_DU and L_DU signals are control signals of upper and lower tubes of one bridge arm sent by the MCU, and after passing through the power driving chip, the upper and lower MOS tubes are driven to output PWM waves, which are equivalent to sine waves. Wherein the diode and the capacitor form a bootstrap circuit for supplying power to the driving of the upper tube.
As shown in fig. 7, the heating wire control circuit comprises a first optocoupler, three resistors, a heating wire and a triac; the three resistors are respectively a fourteenth resistor, a fifteenth resistor and a sixteenth resistor; the fourteenth resistor is connected in parallel between the port 1 and the port 2 of the first optocoupler, the output end port 1 of the first optocoupler is connected to VCC, and the port 2 of the first optocoupler is connected with one end of the fifteenth resistor; the port 3 and the port 4 of the output end of the first optocoupler are respectively connected to the port 3 of the triac and one end of the sixteenth resistor, the port 2 of the triac and the other end of the sixteenth resistor form a common end and are connected to one end of the heating wire, the other end of the heating wire is connected to AC_L (live wire of alternating current), and the port 1 of the triac is connected to AC_N (zero line of alternating current).
When the control signal HeatControl is at a low level, the first optocoupler is conducted, the power supply of the heating wire is normal, and the operation is started. When the control signal HeatControl is at a high level, the first optocoupler is cut off, the heating wire is disconnected from power supply, and the operation is stopped.
As shown in fig. 8, the negative ion emission control circuit includes a second optocoupler, a negative ion generator, and two resistors; the two resistors are a seventeenth resistor and an eighteenth resistor respectively; the eighteenth resistor is connected in parallel between the port 1 and the port 2 of the second optocoupler, and the port 1 and the port 2 of the input end of the second optocoupler are respectively connected to one ends of the VCC and the seventeenth resistor; the port 3 of the output end of the second optocoupler is connected to one end of the negative ion generator, the port 4 of the output end of the second optocoupler is connected to ac_l (live wire of alternating current), and the other end of the negative ion generator is connected to ac_n (zero line of alternating current).
When the Control signal O2Control is at a low level, the second optocoupler is turned on, the negative ion generator is powered normally, and the operation is started. When the Control signal 02Control is at a high level, the second optocoupler is cut off, the negative ion generator is powered off, and the operation is stopped.
It should be understood that the above description is not intended to limit the utility model to the particular embodiments disclosed, but to limit the utility model to the particular embodiments disclosed, and that the utility model is not limited to the particular embodiments disclosed, but is intended to cover modifications, adaptations, additions and alternatives falling within the spirit and scope of the utility model.
Claims (10)
1. A control circuit for an air duct is characterized in that: the device comprises an electromagnetic compatibility filtering unit, a rectifying circuit, a control power supply, a brushless direct current motor power circuit, a brushless direct current motor, a heating wire control circuit and an MCU;
the electromagnetic compatibility filtering unit, the rectifying circuit and the control power supply are sequentially connected through lines;
the electromagnetic compatibility filtering unit, the rectifying circuit, the brushless direct current motor power circuit and the brushless direct current motor are sequentially connected through a circuit;
the mains supply and electromagnetic compatibility filtering unit is connected with the heating wire control circuit and supplies power to the heating wire control circuit;
the electromagnetic compatibility filtering unit is used for inhibiting and eliminating strong electromagnetic interference from commercial power;
the heating wire control circuit adjusts the power of the heating wire, so as to adjust the temperature under control;
the MCU is a control core unit of a control circuit for the air duct, and is connected with the control power supply to acquire control power consumption;
the MCU is connected with the brushless direct current motor power circuit, and sends PWM control waveforms to the brushless direct current motor power circuit;
the brushless direct current motor power circuit is connected with the brushless direct current motor, and the brushless direct current motor power circuit amplifies the received PWM control waveform and then transmits the amplified PWM control waveform to the brushless direct current motor for driving the motor to work.
2. A control circuit for a duct according to claim 1, wherein: the electromagnetic compatibility filtering unit comprises a fuse, a piezoresistor, three resistors, a first capacitor and a transformer; the three resistors are respectively a first resistor, a second resistor and a third resistor; the second resistor and the third resistor are connected in series to form a series circuit, the series circuit is connected with the piezoresistor, the first capacitor and the transformer in parallel to form a parallel circuit, one end of the parallel circuit is connected with one end of the fuse, the other end of the parallel circuit is connected with one end of the first resistor, the other end of the fuse is connected with a live wire of alternating current, and the other end of the first resistor is connected with a zero wire of the alternating current.
3. A control circuit for a duct according to claim 1, wherein: the rectifying circuit comprises 4 rectifying diodes and a first electrolytic capacitor; the rectifier diodes are a first diode, a second diode, a third diode and a fourth diode respectively; the 4 rectifying diodes are in pairwise butt joint to form a bridge structure, the positive electrode of the first electrolytic capacitor is connected with the positive electrode of the bridge structure, and the negative electrode of the first electrolytic capacitor is grounded.
4. A control circuit for a duct according to claim 1, wherein: the control circuit also comprises a bus voltage sampling circuit, wherein the bus voltage sampling circuit comprises three resistors and a second capacitor; the fourth resistor, the fifth resistor and the sixth resistor are connected in series to form a series circuit, one end of the fourth resistor is connected with the voltage VBUS, and the other end of the sixth resistor is grounded; one end of the second capacitor, the other end of the sixth resistor and one end of the fifth resistor form a common end which is connected to the MCU, and the other end of the second capacitor is grounded.
5. A control circuit for a duct according to claim 1, wherein: the device also comprises a temperature key control circuit, an air speed key control circuit, a cold air key circuit, an LED control circuit, an LED screen display circuit and an anion emission control circuit; the MCU is connected with the temperature key control circuit, the wind speed key control circuit, the cold air key circuit or the LED control circuit and used for controlling the temperature of the air duct, controlling the wind speed of the air duct, whether the heating wire works or whether the LED is powered; the MCU and the control power supply are respectively connected with the LED screen display circuit, and when the LED control circuit works, the LED screen display circuit displays the state data of the air duct in real time; the MCU is connected with the negative ion emission control circuit, and the commercial power is connected with and supplies power for the negative ion emission control circuit.
6. A control circuit for a duct according to claim 1, wherein: the control circuit also comprises a BUCK circuit, wherein the control power supply is a BUCK circuit, and the BUCK circuit comprises a BUCK control chip, a fifth diode, a sixth diode, a voltage stabilizing diode, an inductor, a second electrolytic capacitor and a third capacitor; the inductor and the second electrolytic capacitor form a low-pass filter; the cathode of the sixth diode, the third capacitor and the inductor form a common end and are simultaneously connected with a No. 1 pin and a No. 2 pin of the buck control chip; the other end of the third capacitor and the cathode of the fifth diode form a common end which is connected with a No. 4 pin of the buck control chip; the anode of the fifth diode, the other end of the inductor, the anode of the second electrolytic capacitor and the cathode of the voltage stabilizing diode form a common end to be connected, and the common end is output voltage; the anode of the sixth diode, the cathode of the second electrolytic capacitor and the anode of the zener diode are grounded; and the voltage of the VBUS is rectified and then reduced to 15V after passing through the BUCK BUCK circuit, so that the control circuit is powered.
7. A control circuit for a duct according to claim 1, wherein: the brushless direct current motor power circuit comprises a power driving chip, a seventh diode, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourth capacitor, a fifth capacitor, a first MOS tube and a second MOS tube; the H_DU input signal is connected with the No. 2 pin of the power driving chip after being connected with the seventh resistor in series, and the L_DU input signal is connected with the No. 3 pin of the power driving chip after being connected with the eighth resistor in series; the anode of the seventh diode is connected with a ninth resistor, and the cathode of the seventh diode and the fifth capacitor are connected to form a common end which is connected to the No. 8 pin of the power driving chip; the No. 2 pin of the first MOS tube is connected with VBUS voltage, and the No. 1 pin of the first MOS tube is connected with the tenth resistor in series and then connected to the No. 7 pin of the power driving chip; two ends of the eleventh resistor are respectively connected with a No. 1 pin and a No. 3 pin of the first MOS tube; after the No. 1 pin of the second MOS tube is connected with the twelfth resistor in series, the second MOS tube is connected to the No. 5 pin of the power driving chip; the two ends of the thirteenth resistor are respectively connected with the No. 1 pin and the No. 3 pin of the second MOS tube, and the No. 3 pin of the second MOS tube is connected with one end of the thirteenth resistor and then grounded for protection; the other end of the fifth capacitor, the No. 3 pin of the first MOS tube, the No. 2 pin of the second MOS tube and the output signal OUT_U form a common end which is connected to the No. 6 pin of the power driving chip; one end of the fourth capacitor is connected with one end of the ninth resistor and the No. 1 pin of the power driving chip to form a common end, and is connected with 15V voltage; the other end of the fourth capacitor is connected with the No. 4 pin of the power driving chip and then grounded;
the input of the three-phase full-bridge inverter circuit which is formed by 6 MOS-FET tubes taking the power driving chip as the center is PWM wave taking power ground as ground, the PWM wave is transmitted to the input port of the power driving chip, and the brushless DC motor is driven by controlling the MOSFET of the power driving tube.
8. A control circuit for a duct according to claim 1, wherein: the heating wire control circuit comprises a first optocoupler, three resistors, a heating wire and a bidirectional triode thyristor; the three resistors are respectively a fourteenth resistor, a fifteenth resistor and a sixteenth resistor; the fourteenth resistor is connected in parallel between the port 1 and the port 2 of the first optocoupler, the output end port 1 of the first optocoupler is connected to VCC, and the port 2 of the first optocoupler is connected with one end of the fifteenth resistor; the port 3 and the port 4 of the output end of the first optocoupler are respectively connected to the port 3 of the triac and one end of the sixteenth resistor, the port 2 of the triac and the other end of the sixteenth resistor form a common end and are connected to one end of the heating wire, the other end of the heating wire is connected to a live wire of the alternating current, and the port 1 of the triac is connected to a zero line of the alternating current.
9. A control circuit for a duct according to claim 1, wherein: the control circuit also comprises an anion emission control circuit, wherein the anion emission control circuit comprises a second optocoupler, an anion generator and two resistors; the two resistors are a seventeenth resistor and an eighteenth resistor respectively; the eighteenth resistor is connected in parallel between the port 1 and the port 2 of the second optocoupler, and the port 1 and the port 2 of the input end of the second optocoupler are respectively connected to one ends of the VCC and the seventeenth resistor; the port 3 of the output end of the second optical coupler is connected to one end of the negative ion generator, the port 4 of the output end of the second optical coupler is connected to the live wire of the alternating current, and the other end of the negative ion generator is connected to the zero wire of the alternating current.
10. A control circuit for a wind tunnel according to any one of claims 1 to 9, wherein: the voltage sampling circuit is connected with the rectifying circuit and the MCU, acquires voltage information in the rectifying circuit, and outputs the voltage information to the MCU after sampling and conditioning; the current sampling circuit is connected with the brushless direct current motor power circuit and the MCU, acquires current information from the brushless direct current motor power circuit, and outputs the current information to the MCU after sampling and conditioning; the temperature sampling circuit is connected with the heating wire control circuit and the MCU, acquires temperature information from the heating wire control circuit, and outputs the temperature information to the MCU after sampling and conditioning.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321015858.6U CN220529487U (en) | 2023-04-28 | 2023-04-28 | Control circuit for air duct |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321015858.6U CN220529487U (en) | 2023-04-28 | 2023-04-28 | Control circuit for air duct |
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| Publication Number | Publication Date |
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| CN220529487U true CN220529487U (en) | 2024-02-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321015858.6U Active CN220529487U (en) | 2023-04-28 | 2023-04-28 | Control circuit for air duct |
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| Country | Link |
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| CN (1) | CN220529487U (en) |
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2023
- 2023-04-28 CN CN202321015858.6U patent/CN220529487U/en active Active
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