A single-phase AC fan control method and its energy-saving range hood

Abstract

A single-phase AC fan control method includes an AC power supply, a filter circuit, a switching power supply, a microprocessor, a duct temperature acquisition system, a keypad digital display circuit, an H-bridge inverter circuit, a duct wind speed detection device, an energy-saving control circuit, fan A, and fan B. The method is characterized by: the duct temperature acquisition system collecting duct temperature information and transmitting it to the microprocessor; the duct wind speed detection device transmitting duct wind speed information to the microprocessor; and the microprocessor automatically controlling the inverter voltage and current of the H-bridge inverter circuit based on the duct temperature information provided by the duct temperature acquisition system, thereby controlling the speed of fan A or fan B. The beneficial effects are: energy saving; automatic airflow adjustment; convenience for cooking; cost savings for users and convenience in daily life; promotion of energy conservation, reduction of waste, and environmental pollution, thus promoting social ecological development.

Description

[0001] Invention Technology

[0002] This invention relates to a motor and fan control method, and more particularly to a single-phase AC fan control method and its energy-saving range hood.

[0003] Purpose of the invention

[0004] Currently, in range hood products, the motor power of the fan is generally between 200-300 watts. The efficiency is highest when running at high speed, lower when running at medium speed, and even lower when running at low speed. Therefore, when the range hood is running at medium or low speed, it causes a lot of energy waste.

[0005] Normal range hoods operate at high speed when stir-frying; at medium speed when braising or stewing; and at low speed when simmering soup, cooking, or boiling water. In particular, a lot of electricity is wasted when simmering soup, cooking, or boiling water. Therefore, we hope to find an energy-saving range hood fan control method.

[0006] Another issue is that the speed control of the range hood's fan is all done manually, resulting in a mismatch between the airflow and actual needs. Because people's attention is mainly focused on the ingredients, pot, oil, salt, soy sauce, and vinegar when cooking, they often operate the range hood hastily, frequently making mistakes. They might need a high speed but end up with a low speed, and vice versa. When they realize the speed is incorrect, they have to adjust it again while continuing to cook, which is frustrating and can easily affect the quality of the food and waste energy. Therefore, there is a great need for a system that can automatically collect the temperature of the exhaust air and automatically control the fan speed based on the actual temperature of the exhaust air, thereby achieving the goal of convenient cooking and energy saving. Summary of the Invention

[0007] This invention provides a single-phase AC fan control method and an energy-saving range hood thereof, which can solve the problems that need to be solved in the background art.

[0008] The key technical solution of this invention to solve its technical problem is: designing a device that can automatically detect the temperature and wind speed of the range hood duct and automatically adjust the appropriate wind speed, thereby achieving the purpose of facilitating cooking and saving energy; in order to further save energy, a low-power micro fan is also provided for low-speed exhaust, eliminating the energy waste that is likely to occur when the fan is running at low speed, thus achieving a better energy-saving purpose.

[0009] The single-phase AC fan control method and energy-saving range hood of the present invention include a power input, a filter circuit, a switching power supply, an MCU chip, a duct temperature acquisition circuit, control buttons, a duct wind speed detection circuit, an H-bridge inverter circuit, a duct energy-saving control circuit, a fan A, and a fan B.

[0010] The power input is filtered and supplied to the MCU chip via a 5V DC power supply. The power input is then filtered, supplied to the fan A and fan B via an H-bridge inverter circuit and an air duct energy-saving control circuit.

[0011] The duct temperature acquisition circuit acquires the duct temperature information and sends it to the MCU chip; the duct wind speed detection circuit acquires the duct wind speed information and sends it to the MCU chip; the MCU chip automatically controls the inverter voltage and current of the H-bridge inverter circuit based on the duct temperature information provided by the duct temperature acquisition circuit, thereby controlling the speed of fan A or fan B.

[0012] The energy-saving control circuit of the air duct supplies power from the H-bridge inverter circuit to fan A or fan B according to the air duct temperature. When the air duct temperature is higher than the set temperature of 25-40 degrees, the power is supplied to fan A, and when the air duct temperature is lower than the set temperature of 25-40 degrees, the power is supplied to fan B.

[0013] This invention provides an energy-saving range hood, including a range hood housing, a controller, a fan A, a duct wind speed detection device, a duct temperature detection device, an energy-saving controller, a fan B, a duct, and a damper;

[0014] The duct wind speed detection device includes a device housing, a movable magnetic rod, mounting holes, an L3 inductor coil, an inductor frame, a wind hook, a push-pull shaft, and a fixed shaft.

[0015] The device housing contains an inductor frame, which is a hollow tube made of insulating material; the outer circle of the inductor frame contains an L3 inductor coil; the inner hole of the L3 inductor coil contains a movable magnetic rod.

[0016] A fixed shaft is provided on the left side of the device housing. The fixed shaft has a movable wind hook, and a push-pull shaft is provided on the wind hook. The push-pull shaft is movably connected to a movable magnetic rod. When the wind hook is blown by the wind, it drives the movable magnetic rod to move, thereby changing the inductance of the L3 inductor coil. By collecting and amplifying the inductance signal of the L3 inductor coil, the wind speed information of the air duct can be obtained.

[0017] The range hood housing includes shells of various structural shapes made of various materials;

[0018] The controller includes a 100-250V AC power supply, a filter circuit, a switching power supply, a microprocessor control circuit, a duct temperature information acquisition circuit, an H-bridge inverter circuit, a duct wind speed detection circuit, an energy-saving control circuit, and a keypad display circuit.

[0019] The temperature control circuit includes M1, M2, KT, and WHD; M1 is a 200-300 watt fan; M2 is a 5-20 watt fan; KT is a relay; XS8, XS9 and...Figure 7 The XP8 and XP9 are connected; the WHD is a high-precision thermistor, preferably an NTC series model; the WHD is installed in the air duct; when the temperature of the WHD in the air duct is higher than the set temperature of 25-40 degrees, KT supplies power to fan A; when the temperature of the WHD in the air duct is lower than 25-40 degrees, KT supplies power to fan B; thus, fan B runs at low speed when the air duct is low temperature, and fan A runs at high speed when the air duct is high temperature, avoiding the energy waste caused by the high-power motor running at both low and high air duct temperatures, thereby achieving the purpose of automatic energy saving.

[0020] The key-display circuit includes SB1, SB2, SB3, SB4, U7, and LED30; U7 is a multi-channel touch chip, preferably model SC92F8363B; SB1 is the power button, SB2 is the decrement button, SB3 is the increment button, and SB4 is the function button.

[0021] The duct wind speed detection circuit includes U2, L3, R8, C8, C24, C9, R28, R14, R13, R12, R29, C21, R34, R11R, and 9R10; U2 is a dual operational amplifier integrated circuit chip, preferably LM358; L3 is... Figure 3 The L3 inductor coil; the XP2 and Figure 8 XS3 connection;

[0022] When the wind speed in the duct changes, the wind hook of the duct wind speed detection device installed in the duct drives the movable magnetic rod to move, thereby changing the inductance of the L3 inductor coil. U2 amplifies the signal of the inductance change of L3 and transmits it to U3 for analysis and processing through XP2, thereby calculating and judging the wind speed in the duct. U3 adjusts the voltage and current of XP5, XP6, and XP7 according to the wind speed and temperature in the duct, thereby controlling the output voltage and current of XP8 and XP9 of U5 and U6, thereby controlling the speed of M1 or M2 and fans A and B. This achieves low-speed operation of fans A and B when the duct temperature is low and high-speed operation when the duct temperature is high, thereby achieving the purpose of automatically saving energy and allowing people to concentrate on cooking, avoiding the trouble of adjusting the range hood speed while cooking and the energy waste caused by improper adjustment.

[0023] The beneficial effects of this invention are: saving electricity; automatically adjusting air volume; making cooking easier; saving users money and bringing convenience to their lives; promoting energy conservation in society, reducing waste, reducing environmental pollution, and promoting social ecological development. Attached Figure Description

[0024] Figure 1 This is a block diagram illustrating the principle of the present invention.

[0025] Figure 2 This is a structural diagram of an application example of the present invention.

[0026] Figure 3 This is a structural diagram of the wind speed detection device according to an application embodiment of the present invention.

[0027] Figure 4 This is a filter circuit diagram for an application embodiment of the present invention.

[0028] Figure 5 This is a circuit diagram of a switching power supply according to an application embodiment of the present invention.

[0029] Figure 6 This is a microprocessor control circuit diagram for an application embodiment of the present invention.

[0030] Figure 7 This is a diagram of an H-bridge inverter circuit representing an application embodiment of the present invention.

[0031] Figure 8 This is an energy-saving control circuit diagram for an application embodiment of the present invention.

[0032] Figure 9 This is a circuit diagram for detecting wind speed in a duct, representing an application embodiment of the present invention.

[0033] Figure 10 This is a circuit diagram of a keypad digital display for an application embodiment of the present invention.

[0034] In the diagram: 1. Range hood housing; 2. Controller; 3. Fan A; 4. Duct wind speed detection device; 41. Device housing; 42. Movable magnetic rod; 43. Mounting hole; 44. L3 inductor coil; 45. Inductor frame; 46. Wind hook; 47. Push-pull shaft; 48. Fixed shaft; 5. Duct temperature acquisition device; 6. Energy-saving controller; 7. Fan B; 8. Duct; 9. Air damper. Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0036] Example 1.

[0037] exist Figure 1 The single-phase AC fan control method of the present invention includes an AC power supply, a filter circuit, a switching power supply, a microprocessor, a duct temperature acquisition system, a keypad digital display circuit, an H-bridge inverter circuit, a duct wind speed detection device, an energy-saving control circuit, a fan A, and a fan B.

[0038] The AC power supply is filtered and converted into 5V DC power by a switching power supply to power the microprocessor; the AC power supply is filtered, converted into H-bridge inverter circuit and energy-saving control circuit, and then supplied to fan A or fan B by the energy-saving control circuit.

[0039] The duct temperature acquisition device collects the duct temperature information and transmits it to the microprocessor; the duct wind speed detection device transmits the duct wind speed information to the microprocessor; the microprocessor automatically controls the inverter voltage and current of the H-bridge inverter circuit based on the duct temperature information provided by the duct temperature acquisition device, thereby controlling the speed of fan A or fan B.

[0040] The energy-saving control circuit supplies power from the H-bridge inverter circuit to either fan A or fan B based on the duct temperature information. When the duct temperature is higher than the set temperature of 25-40 degrees Celsius, power is supplied to fan A; when the duct temperature is lower than the set temperature of 25-40 degrees Celsius, power is supplied to fan B. This ensures that fan B operates at low speed when the duct temperature is low and fan A operates at high speed when the duct temperature is high, avoiding energy waste caused by high-power motors operating at both low and high duct temperatures, thus achieving the goal of automatic energy saving.

[0041] Example 2.

[0042] exist Figure 2 The present invention provides an energy-saving range hood, comprising a range hood housing (1), a controller (2), a fan A (3), an air duct (8), and an air damper (9); characterized in that it further comprises an air duct wind speed detection device (4), an air duct temperature detection device (5), an energy-saving controller (6), and a fan B (7).

[0043] exist Figure 3 The wind speed detection device (4) in the duct includes a device housing (41), a movable magnetic rod (42), a mounting hole (43), an L3 inductor coil (44), an inductor frame (45), a wind hook (46), a push-pull shaft (47), and a fixed shaft (48).

[0044] The device housing (41) contains an inductor frame (45), which is a hollow tube made of insulating material; the outer circle of the inductor frame (45) contains an L3 inductor coil (44); the inner hole of the L3 inductor coil (44) contains a movable magnetic rod (42).

[0045] A fixed shaft (48) is provided on the left side of the device housing (41). The fixed shaft (48) has a movable wind hook (46). A push-pull shaft (47) is provided on the wind hook (46). The push-pull shaft (47) is movably connected to a movable magnetic rod (42). When the wind hook (46) is blown by the wind, it drives the movable magnetic rod (42) to move, thereby changing the inductance of the L3 inductor coil (44). By collecting and amplifying the inductance signal of the L3 inductor coil (44), the wind speed information of the duct can be obtained.

[0046] The range hood housing (1) includes various structural shapes made of various materials;

[0047] The controller (2) includes a 100-250V AC power supply, a filter circuit, a switching power supply, a microprocessor control circuit, a duct temperature information acquisition circuit, an H-bridge inverter circuit, a duct wind speed detection circuit, an energy-saving control circuit, and a key display circuit.

[0048] exist Figure 4 In this circuit, the filter circuit consists of RV1, FUSE, L4, C1, L1, C2, R1, R2, CY2, and CY3.

[0049] The RV1 is a varistor circuit breaker with a voltage greater than 270V; the FUSE is a 1-2A fuse.

[0050] exist Figure 5 The switching power supply includes DB1, R3, C3, U1, C5, D3, C4, L2, R5, R6, D2, C7, C6, R7, U4, C22, and C10;

[0051] U1 is an adjustable switching power supply chip, preferably model DK501; U4 is an adjustable voltage regulator chip, preferably model 78L05;

[0052] exist Figure 6 In this circuit, the microprocessor control circuit includes U3, R17, R19, R27, R33, R15, R20, R30, R26, R32, C20, C19, Q2, and LED1;

[0053] U3 is an MCU series microprocessor chip; the preferred model is SC92F8362B; Q2 is a field-effect transistor, the preferred model is 1N60;

[0054] exist Figure 6 In the circuit, the duct temperature information acquisition circuit includes NTC, R25, C19, and R26; the NTC is a high-precision thermistor, preferably the NCP18 series.

[0055] exist Figure 7 In the circuit, the H-bridge inverter circuit includes U5, U6, R19, C13, C14, R16, R18, C11, C12, R22, R23, R24, C15, C16, C17, and C18; U5 and U6 are intelligent half-bridge drive modules, preferably BRD1265C; XS3 and XS4 are connected... Figure 4 XP3 and XP4 are used in the filter circuit; XP8 and XP9 are connected. Figure 8 Temperature control circuits XS8 and XS9;

[0056] exist Figure 8In the circuit, the temperature control circuit includes M1, M2, KT, and WHD; M1 is a 200-300 watt fan; M2 is a 5-20 watt fan; KT is a relay; and XS8, XS9 and... Figure 7 XP8 and XP9 connections; the WHD is a high-precision thermistor, preferably an NTC series model; the WHD is set in Figure 2 In the air duct (8); when the WHD temperature of the air duct is higher than the set temperature of 25-40 degrees, KT will supply power to the fan A; when the WHD temperature of the air duct is lower than 25-40 degrees, KT will supply power to the fan B; thus realizing that the fan B (7) runs at low speed when the air duct is low temperature and the fan A (3) runs at high speed when the air duct is high temperature, avoiding the waste of power caused by the operation of high-power motors when the air duct is low temperature or high temperature, thus achieving the purpose of automatically saving power.

[0057] exist Figure 9 In the circuit, the duct wind speed detection circuit includes U2, L3, R8, C8, C24, C9, R28, R14, R13, R12, R29, C21, R34, R11R, and 9R10; U2 is a dual operational amplifier integrated circuit chip, preferably an LM358; L3 is... Figure 3 L3 inductor coil (44); XP2 and Figure 8 XS3 connection;

[0058] exist Figure 10 In the circuit, the key display circuit includes SB1, SB2, SB3, SB4, U7, LED30, RP1, RP2, RP3, C60, and Y1; U7 is a multi-channel touch chip, preferably model SC92F8363B; SB1 is the power button, SB2 is the decrement button, SB3 is the increment button, and SB4 is the function button.

[0059] Figure 2 , Figure 3 , Figure 6 , Figure 7 , Figure 9When the wind speed in the duct (8) changes, the wind hook (46) of the wind speed detection device (4) set in the duct (8) drives the movable magnetic rod (42) to move, thereby changing the inductance of L3 inductor coil (44), i.e., L3. U2 amplifies the signal of the change in inductance of L3 and transmits it to U3 through XP2 for analysis and processing, thereby calculating and judging the wind speed in the duct. According to the wind speed and temperature in the duct, U3 adjusts the voltage and current of XP5, XP6, and XP7, thereby controlling the output voltage and current of XP8 and XP9 of U5 and U6, thereby controlling the speed of M1 or M2 and fan A (3) and fan B (7). Thus, when the duct temperature is low, fan A (3) and fan B (7) run at low speed and when the duct temperature is high, they run at high speed, thereby achieving the purpose of automatically saving energy. It also makes it convenient for people to concentrate on cooking and avoid the trouble of adjusting the range hood speed and the waste of energy caused by improper adjustment when cooking.

Claims

1. An energy-saving range hood, comprising a range hood housing (1), a controller (2), a fan A (3), an air duct (8), and an air damper (9); characterized in that: It also includes a duct wind speed detection device (4), a duct temperature detection device (5), an energy-saving controller (6), and a fan B (7); The controller (2) includes an AC power supply, a filter circuit, a switching power supply, a microprocessor control circuit, a duct temperature information acquisition circuit, an H-bridge inverter circuit, a duct wind speed detection circuit, an energy-saving control circuit, and a key display circuit. The AC power supply is filtered and converted into 5V DC power by a switching power supply to power the microprocessor; the AC power supply is filtered, converted into H-bridge inverter circuit and energy-saving control circuit, and then supplied to fan A or fan B by the energy-saving control circuit. The duct temperature information acquisition circuit acquires the duct temperature information and transmits it to the microprocessor; the duct wind speed detection circuit acquires the duct wind speed information and transmits it to the microprocessor; the microprocessor automatically controls the inverter voltage and current of the H-bridge inverter circuit based on the duct temperature information provided by the duct temperature information acquisition circuit, thereby controlling the speed of fan A or fan B. The energy-saving control circuit supplies power from the H-bridge inverter circuit to fan A or fan B based on the duct temperature information. When the duct temperature is higher than the set temperature, power is supplied to fan A, and when the duct temperature is lower than the set temperature, power is supplied to fan B. The set temperature range is 25-40 degrees Celsius. The duct wind speed detection device (4) includes a device housing (41), a movable magnetic rod (42), a mounting hole (43), an L3 inductor coil (44), an inductor frame (45), a wind hook (46), a push-pull shaft (47), and a fixed shaft (48). The device housing (41) contains an inductor frame (45), which is a hollow tube made of insulating material; the outer circle of the inductor frame (45) contains an L3 inductor coil (44); the inner hole of the L3 inductor coil (44) contains a movable magnetic rod (42). A fixed shaft (48) is provided on the left side of the device housing (41). The fixed shaft (48) has a movable wind hook (46). A push-pull shaft (47) is provided on the wind hook (46). The push-pull shaft (47) is movably connected to a movable magnetic rod (42). When the wind hook (46) is blown by the wind, it drives the movable magnetic rod (42) to move, thereby changing the inductance of the L3 inductor coil (44). By collecting and amplifying the inductance signal of the L3 inductor coil (44), the wind speed information of the duct can be obtained.

2. The energy-saving range hood according to claim 1, characterized in that: The duct temperature information acquisition circuit includes NTC, R25, C19, and R26; the NTC is a high-precision thermistor, model NCP18 series.

3. The energy-saving range hood according to claim 1, characterized in that: The energy-saving control circuit includes M1, M2, KT, and WHD; M1 is a 200-300 watt fan; M2 is a 5-20 watt fan; KT is a relay; WHD is a high-precision thermistor, model NTC series; WHD is set in the air duct (8); when the temperature of WHD in the air duct is higher than the set temperature, KT supplies power to fan A; when the temperature of WHD in the air duct is lower than the set temperature, KT supplies power to fan B; the set temperature range is 25-40 degrees.

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