CN216595938U - Kitchen exhaust fan power control circuit based on 555 chips - Google Patents
Kitchen exhaust fan power control circuit based on 555 chips Download PDFInfo
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- CN216595938U CN216595938U CN202123210623.6U CN202123210623U CN216595938U CN 216595938 U CN216595938 U CN 216595938U CN 202123210623 U CN202123210623 U CN 202123210623U CN 216595938 U CN216595938 U CN 216595938U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The utility model discloses a kitchen exhaust fan power supply control circuit based on a 555 chip, and belongs to the technical field of electronics. The control circuit mainly comprises 555 chips U1 and U2, a relay RL1, a triode Q1, resistors R1-R5, a diode D1, capacitors C1 and C2, and keys K1 and K2. The 555 chip U1 forms a bistable trigger for controlling the working states of the triode Q1 and the relay RL1, and the 555 chip U2 forms a monostable trigger for controlling the reset of the 555 chip U1 and the U2. The key K1 is used for power-on control, and the key K2 is used for delayed power-off control. When the kitchen is turned off, the exhaust fan continues to work to exhaust residual oil smoke in the kitchen, the exhaust fan automatically stops working after a plurality of minutes, and the problem that a user forgets to turn off the exhaust fan to cause power waste is avoided.
Description
Technical Field
The utility model relates to a kitchen exhaust fan control circuit, and belongs to the technical field of electronics.
Background
The air discharge fan in the existing market is generally controlled by a simple switch, inconvenience is brought to life of a user, for example, after the user uses a kitchen, if the air discharge fan is directly turned off, residual oil smoke in the kitchen cannot be discharged, if the air discharge fan is allowed to continue working, the residual oil smoke is discharged, and after the user forgets to turn off the air discharge fan frequently, so that electricity waste is caused. To this not enough, the utility model patent "a kitchen air discharge fan timing circuit based on 555" provides a technical scheme, realizes the automatic shutdown of air discharge fan with timing circuit. However, in this technical solution, each time the potentiometer is used, the potentiometer needs to be manually adjusted to adjust the timing time length. However, the user usually does not determine the time length of each kitchen use, so that the manual adjustment of the potentiometer to achieve timing can result in too short or too long timing, thereby affecting the use effect.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems, the utility model provides a power supply control circuit of a kitchen exhaust fan based on a 555 chip, which is provided with two keys: the starting button and the delayed shutdown button are pressed once, and the exhaust fan works. When the exhaust fan works, the time delay shutdown key is pressed once, the exhaust fan continues to work to discharge residual oil smoke in a kitchen, and after a time delay of several minutes, the exhaust fan stops working.
The adopted specific technical scheme is as follows:
a power supply control circuit of a kitchen exhaust fan based on a 555 chip comprises 555 chips U1 and U2, a relay RL1, a triode Q1, resistors R1-R5, a diode D1, capacitors C1 and C2, keys K1 and K2, a live wire input end L _ IN, a live wire output end L _ OUT, a zero wire input end N _ IN and a zero wire output end N _ OUT, wherein a pin 1 of the 555 chip U1 is grounded, pins 4 and 8 are connected with +5V, a pin 2 is connected with one end of a resistor R1 and one end of a key K1, pins 6 and 7 are connected with the anode of the capacitor C1 and one end of the resistor R2, a pin 3 is connected with one end of the resistor R5, the other end of the resistor R1 is connected with +5V, and the other end of the key K1 is grounded with the cathode of the capacitor C1; the 1 pin of the 555 chip U2 is grounded, the 4 pin and the 8 pin are connected with +5V, the 2 pin is connected with one end of a resistor R3 and one end of a key K2, the 6 pin and the 7 pin are connected with the anode of a capacitor C2 and one end of a resistor R4, the 3 pin is connected with the other end of a resistor R2 and the other end of the resistor R4, the other end of a resistor R3 is connected with +5V, and the other end of the key K2 and the cathode of the capacitor C2 are grounded; the base electrode of the triode Q1 is connected with the other end of the resistor R5, the emitting electrode is grounded, and the collector electrode is connected with the anode of the diode D1 and one end of the coil of the relay RL 1; the other end of the coil of the relay RL1 and the negative electrode of the diode D1 are connected with +5V, a normally open contact is connected with a live wire input end L _ IN, a common contact is connected with a live wire output end L _ OUT, and a zero line input end N _ IN is connected with a zero line output end N _ OUT.
The utility model has the beneficial effects that: the utility model provides a kitchen exhaust fan control circuit, which is characterized in that when a user presses a shutdown key, an exhaust fan continues to work to discharge residual oil smoke in a kitchen, and after a delay of several minutes, the exhaust fan stops working, so that the problem that the user forgets the exhaust fan to cause power waste is avoided.
Drawings
Fig. 1 shows an embodiment of the present invention.
Detailed Description
The utility model is further described below with reference to the accompanying drawings.
The specific circuit is shown in figure 1, and the kitchen exhaust fan power supply control circuit based on the 555 chip is characterized in that: the circuit comprises 555 chips U1 and U2, a relay RL1, a triode Q1, resistors R1-R5, a diode D1, capacitors C1 and C2, keys K1 and K2, a live wire access end L _ IN, a live wire connection output end L _ OUT, a zero wire access end N _ IN and a zero wire connection output end N _ OUT, wherein a pin 1 of the 555 chip U1 is grounded, a pin 4 and a pin 8 are connected with +5V, a pin 2 is connected with one end of a resistor R1 and one end of a key K1, a pin 6 and a pin 7 are connected with the positive electrode of the capacitor C1 and one end of the resistor R2, a pin 3 is connected with one end of the resistor R5, the other end of the resistor R1 is connected with +5V, and the other end of the key K1 and the negative electrode of the capacitor C1 are grounded; the 1 pin of the 555 chip U2 is grounded, the 4 pin and the 8 pin are connected with +5V, the 2 pin is connected with one end of a resistor R3 and one end of a key K2, the 6 pin and the 7 pin are connected with the anode of a capacitor C2 and one end of a resistor R4, the 3 pin is connected with the other end of a resistor R2 and the other end of the resistor R4, the other end of a resistor R3 is connected with +5V, and the other end of the key K2 and the cathode of the capacitor C2 are grounded; the base electrode of the triode Q1 is connected with the other end of the resistor R5, the emitting electrode is grounded, and the collector electrode is connected with the anode of the diode D1 and one end of the coil of the relay RL 1; the other end of the coil of the relay RL1 and the negative electrode of the diode D1 are connected with +5V, a normally open contact is connected with a live wire input end L _ IN, a common contact is connected with a live wire output end L _ OUT, and a zero line input end N _ IN is connected with a zero line output end N _ OUT.
When the exhaust fan is implemented, the live wire access end L _ IN is connected with the live wire of a power supply, the live wire access end L _ OUT is connected with the live wire of the exhaust fan, the zero wire access end N _ IN is connected with the zero wire of the power supply, the zero wire access end is connected with the zero wire of the exhaust fan, and the normally open switch of the relay RL1 controls the opening or closing of the exhaust fan. The key K1 is a power-on key, and the key K2 is a delayed power-off key.
555 chip U1 and its peripheral components constitute a double voltage regulation trigger. When the key K1 is pressed once, the pin 2 of the 555 chip U1 is triggered at a low level, the output end of the 555 chip U1 is turned to a high level to drive the triode Q1 to be conducted, the relay RL is attracted, and the exhaust fan is powered to work.
555 chip U2 and its peripheral components constitute a monostable trigger which is normally at low level and temporarily at high level. When the key K2 is pressed once, the 2 feet of the 555 chip U2 obtain low level trigger, the 555 chip U2 outputs high level, and the monostable trigger enters a transient steady state. In a transient state, when the output level of the 555 chip U2 is high, one path starts to charge the capacitor C1 through the resistor R2, and the other path starts to charge the capacitor C2 through the resistor R4. Since R4 is 1.2M, R2 is 1M, and C1= C2, the time constant R2C1 is smaller than the time constant R4C2, and the charging speed of C1 is slightly faster than that of C2. Therefore, the voltage of the capacitor C1 is firstly increased to two thirds of the voltage of +5V, so that the output of the 555 chip U1 is inverted to low level, the triode Q1 is cut off, the relay RL1 is released, and the exhaust fan stops working. Then, the voltage of the capacitor C2 rises to two thirds of the voltage of +5V, so that the output of the 555 chip U2 is inverted to low level, and the monostable trigger is restored to a steady state to prepare for the next time delay shutdown.
From the time when the key K2 is pressed to the time when the exhaust fan stops working, the delay time is determined by the parameters of the resistor R2 and the capacitor C1, the longer the time constant R2C1 is, the longer the delay time is, but the time constant R4C2 is ensured to be larger than the time constant R2C 1.
Claims (1)
1. The utility model provides a kitchen air discharge fan power control circuit based on 555 chips realizes, characterized by: the circuit comprises 555 chips U1 and U2, a relay RL1, a triode Q1, resistors R1-R5, a diode D1, capacitors C1 and C2, keys K1 and K2, a live wire access end L _ IN, a live wire connection output end L _ OUT, a zero wire access end N _ IN and a zero wire connection output end N _ OUT, wherein a pin 1 of the 555 chip U1 is grounded, a pin 4 and a pin 8 are connected with +5V, a pin 2 is connected with one end of a resistor R1 and one end of a key K1, a pin 6 and a pin 7 are connected with the positive electrode of the capacitor C1 and one end of the resistor R2, a pin 3 is connected with one end of the resistor R5, the other end of the resistor R1 is connected with +5V, and the other end of the key K1 and the negative electrode of the capacitor C1 are grounded; the 1 pin of the 555 chip U2 is grounded, the 4 pin and the 8 pin are connected with +5V, the 2 pin is connected with one end of a resistor R3 and one end of a key K2, the 6 pin and the 7 pin are connected with the anode of a capacitor C2 and one end of a resistor R4, the 3 pin is connected with the other end of a resistor R2 and the other end of the resistor R4, the other end of a resistor R3 is connected with +5V, and the other end of the key K2 and the cathode of the capacitor C2 are grounded; the base electrode of the triode Q1 is connected with the other end of the resistor R5, the emitting electrode is grounded, and the collector electrode is connected with the anode of the diode D1 and one end of the coil of the relay RL 1; the other end of the coil of the relay RL1 and the negative electrode of the diode D1 are connected with +5V, a normally open contact is connected with a live wire input end L _ IN, a common contact is connected with a live wire output end L _ OUT, and a zero line input end N _ IN is connected with a zero line output end N _ OUT.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123210623.6U CN216595938U (en) | 2021-12-21 | 2021-12-21 | Kitchen exhaust fan power control circuit based on 555 chips |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123210623.6U CN216595938U (en) | 2021-12-21 | 2021-12-21 | Kitchen exhaust fan power control circuit based on 555 chips |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216595938U true CN216595938U (en) | 2022-05-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123210623.6U Active CN216595938U (en) | 2021-12-21 | 2021-12-21 | Kitchen exhaust fan power control circuit based on 555 chips |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216595938U (en) |
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2021
- 2021-12-21 CN CN202123210623.6U patent/CN216595938U/en active Active
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