Range hood wind speed delayed automatic switching system and method

Abstract

A range hood wind speed delay automatic switching system comprises a resistor-capacitor voltage-drop circuit module, a voltage-stabilizing circuit module, a voltage-dividing circuit module, a rectifier-filtering circuit module, a voltage comparison circuit module, a timer circuit module, a relay circuit module and a range hood. The input end of the resistor-capacitor voltage-drop circuit module is connected to the mains power supply and the output end is connected to the voltage-stabilizing circuit module, the input end of the voltage-dividing circuit module is connected to the output end of the voltage-stabilizing circuit module and the input end of the rectifier-filtering circuit module is connected to a key on the range hood, the output end of the voltage-dividing circuit module and the output end of the rectifier-filtering circuit module are respectively connected to the input end of the voltage comparison circuit module, the output end of the voltage comparison circuit module is connected to the input end of the timer circuit module, the output end of the timer circuit module is connected to the input end of the relay circuit module and the output end of the relay circuit module is connected to the fan of the range hood.

Description

Technical Field

[0001] The invention relates to the field of range hoods, and in particular to a system and method for automatically switching the wind speed of a range hood with a delayed rotation. Background Art

[0002] At present, ordinary Chinese-style range hoods on the market lack an electronic control system. In order to achieve three wind speeds, three control buttons are generally required to switch, which is cumbersome to operate. In addition, when running at the highest wind speed, there are problems such as excessive noise and excessive energy consumption. Given that ordinary range hoods without electronic control systems have a huge number of possessions, and have the advantages of being cheap and relatively convenient to use, upgrading existing range hoods is very necessary and meets the actual needs of the current market consumption upgrade. Summary of the invention

[0003] In order to overcome the above-mentioned defects, the present invention provides a system and method for automatically switching the wind speed of a range hood with delayed switching, which can achieve switching between three wind speeds through two buttons.

[0004] The first technical solution adopted by the present invention to solve its technical problems is: a delayed automatic switching system for the wind speed of a range hood, comprising a resistor-capacitor voltage-drop circuit module, a voltage-stabilizing circuit module, a voltage-dividing circuit module, a rectifier-filter circuit module, a voltage comparison circuit module, a timer circuit module, a relay circuit module and a range hood, wherein the input end of the resistor-capacitor voltage-drop circuit module is connected to the mains power and the output end is connected to the voltage-stabilizing circuit module so as to convert the mains power into a regulated power supply, the input end of the voltage-dividing circuit module is connected to the output end of the voltage-stabilizing circuit module and the input end of the rectifier-filter circuit module is connected to a button on the range hood, the output end of the voltage-dividing circuit module and the output end of the rectifier-filter circuit module are respectively connected to the input end of the voltage comparison circuit module, the output end of the voltage comparison circuit module is connected to the input end of the timer circuit module, the output end of the timer circuit module is connected to the input end of the relay circuit module and the output end of the relay circuit module is connected to the fan of the range hood.

[0005] As a further improvement of the first technical solution of the present invention, the timer circuit module includes a charging capacitor and a transistor, and the voltage stabilizing circuit module, the charging capacitor, the transistor and the relay circuit module are connected in series in sequence.

[0006] As a further improvement of the first technical solution of the present invention, the voltage comparison circuit module is implemented by an LM358 operational amplifier.

[0007] The second technical solution adopted by the present invention to solve its technical problem is: a method for automatic delayed switching of range hood wind speed, comprising the following steps: turning on the automatic delay button, and the fan switches to medium speed operation after running at high speed for a set time.

[0008] As a further improvement of the second technical solution of the present invention, the following steps are also included: turning on the low-speed button, and the fan runs at a low speed.

[0009] The beneficial effect of the present invention is: by setting a delay module and a voltage comparison circuit module, the present invention enables the range hood to only be set with a low-speed button and an automatic delay button, and three wind speeds can be switched by two buttons. The highest speed is only an intermediate process, and different highest wind speed delay effects can be achieved by adjusting the matching of resistors and capacitors. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural diagram of the range hood wind speed delayed automatic switching system of the present invention.

[0011] Figure 2 This is a flow chart of the method for automatically switching the wind speed of a range hood with delayed switching according to the present invention.

[0012] 1---RC step-down circuit module 2---voltage stabilizing circuit module

[0013] 3---Voltage divider circuit module 4---Rectifier filter circuit module

[0014] 5---Voltage comparison circuit module 6---Timer circuit module

[0015] 7---Relay circuit module 8---Ranoid hood DETAILED DESCRIPTION

[0016] Please refer to Figure 1 A system for automatically switching the wind speed of a range hood with delayed switching includes a resistor-capacitor voltage-drop circuit module 1, a voltage-stabilizing circuit module 2, a voltage-dividing circuit module 3, a rectifier-filtering circuit module 4, a voltage-comparison circuit module 5, a timer circuit module 6, a relay circuit module 7, and a range hood 8. The input end of the resistor-capacitor voltage-drop circuit module 1 is connected to the mains power supply, and the output end is connected to the voltage-stabilizing circuit module 2, so as to convert the mains power supply into a regulated power supply. The input end of the voltage-dividing circuit module 3 is connected to the output end of the voltage-stabilizing circuit module 2, and the input end of the rectifier-filtering circuit module 4 is connected to a key on the range hood 8. The output end of the voltage-dividing circuit module 3 and the output end of the rectifier-filtering circuit module 4 are respectively connected to the input end of the voltage-comparison circuit module 5, and the output end of the voltage-comparison circuit module 5 is connected to the input end of the timer circuit module 6. The output end of the timer circuit module 6 is connected to the input end of the relay circuit module 7, and the output end of the relay circuit module 7 is connected to the fan of the range hood 8.

[0017] Specifically, the timer circuit module 6 includes a charging capacitor (not shown) and a triode (not shown), and the voltage stabilizing circuit module 2, the charging capacitor, the triode and the relay circuit module 7 are connected in series in sequence. The voltage stabilizing circuit module 2 charges the charging capacitor, and when the charging voltage of the capacitor is higher than the trigger voltage inside the timer (equivalent to a gate setting), the triode opens, thereby pushing the relay circuit module 7 to close. The one originally in the normally closed state is switched to an open circuit, and the one in the normally open state is switched to a closed state. After such switching, the high-speed fan originally connected to the normally closed ends is cut off after the delay ends, and the medium-speed fan originally connected to the normally open ends is opened after the delay ends.

[0018] In a specific implementation, the voltage comparison circuit module 5 is implemented by an LM358 operational amplifier. The voltage on the high-speed wire tap of the range hood 8 is rectified and filtered by a high-voltage capacitor to become a direct current, which is used as one input (negative term) of the voltage comparison circuit module 5. The voltage divided by the 12V voltage-stabilized power supply is used as another input (positive term) of the voltage comparison circuit module 5, so that the capacitor of the timer circuit module 6 is not charged and does not enter the delay state at low speed, and the capacitor of the timer circuit module 6 is charged and enters the delayed automatic switching state at high speed, so as to judge the user operation. That is, the voltage comparison circuit module 5 judges the user's key switching operation, and realizes the switching of the range hood 8 between the medium and high speed only under the automatic delay key.

[0019] In a specific implementation manner, the mains power is 220V, and the converted regulated power supply is 12V.

[0020] The function of the voltage-stabilized power supply (12V) is to provide driving power for the entire circuit control module including the voltage-dividing circuit module 3, the rectifying and filtering circuit module 4, the voltage comparison circuit module 5, the timer circuit module 6 and the relay circuit module 7. In the present invention, when the low-speed button is pressed, the range hood 8 runs at a low speed; when the automatic delay button is pressed, the delay module (including the timer circuit module 6 and the relay circuit module 7) starts to work, and controls the range hood 8 to run at a high speed for a certain period of time and then switch to a medium speed; when low-speed operation is required, just press the low-speed button again. Therefore, the present invention enables the range hood 8 to switch between three wind speeds with only two buttons, and the highest speed is only an intermediate process. Different delay effects of the highest wind speed are achieved by adjusting the matching of resistors and capacitors.

[0021] In the existing range hoods, the buttons and the fan are directly electrically connected one by one. When a button is pressed, the fan executes the wind speed corresponding to the button. The essence of the present invention is that a control panel is set between the buttons and the fan of the range hood. The control panel determines the button switching of the user and controls the operation of the fan.

[0022] Please refer to Figure 2The present invention also relates to a method for automatically switching the wind speed of a range hood with delayed operation, comprising the following steps: turning on an automatic delay button, and switching the fan to medium speed operation after the fan runs at high speed for a set time.

[0023] In a specific implementation manner, the present invention further includes the following steps: turning on the low gear button, and the fan runs at a low speed.

[0024] The low-speed button controls the fan to run at a low speed; the automatic delay button, that is, the high / medium-speed button, controls the fan to run at a high speed for a specified time and then at a medium speed.

[0025] The present invention enables the range hood to be provided with only a low-speed button and an automatic delay button, and three wind speeds can be switched by the two buttons, and the highest speed is only an intermediate process. Different delay effects of the highest wind speed can be achieved by adjusting the matching of resistors and capacitors.

Claims

1. A range hood wind speed delayed automatic switching system, characterized by: The invention comprises a resistor-capacitor voltage-drop circuit module, a voltage-stabilizing circuit module, a voltage-dividing circuit module, a rectifier-filtering circuit module, a voltage comparison circuit module, a timer circuit module, a relay circuit module and a range hood. The input end of the resistor-capacitor voltage-drop circuit module is connected to the mains power supply and the output end is connected to the voltage-stabilizing circuit module so as to convert the mains power supply into a voltage-stabilizing power supply. The input end of the voltage-dividing circuit module is connected to the output end of the voltage-stabilizing circuit module and the input end of the rectifier-filtering circuit module is connected to a button on the range hood. The output end of the voltage-dividing circuit module and the output end of the rectifier-filtering circuit module are respectively connected to the input end of the voltage comparison circuit module. The output end of the voltage comparison circuit module is connected to the input end of the timer circuit module. The output end of the timer circuit module is connected to the input end of the relay circuit module and the output end of the relay circuit module is connected to the fan of the range hood. When the low-speed button is pressed, the range hood runs at a low speed. When the automatic delay button is pressed, the delay module starts to work and controls the range hood to run at a high speed for a certain period of time and then switch to a medium speed. When low-speed operation is required, the low-speed button only needs to be pressed again.

2. The range hood wind speed delayed automatic switching system according to claim 1 is characterized in that: The timer circuit module comprises a charging capacitor and a triode, and the voltage stabilizing circuit module, the charging capacitor, the triode and the relay circuit module are connected in series in sequence.

3. The range hood wind speed delayed automatic switching system according to claim 1 is characterized in that: The voltage comparison circuit module is implemented by an LM358 operational amplifier.

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