CN213342042U - Power supply circuit of range hood - Google Patents
Power supply circuit of range hood Download PDFInfo
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- CN213342042U CN213342042U CN202022359500.8U CN202022359500U CN213342042U CN 213342042 U CN213342042 U CN 213342042U CN 202022359500 U CN202022359500 U CN 202022359500U CN 213342042 U CN213342042 U CN 213342042U
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Abstract
The utility model discloses a power supply circuit of lampblack absorber, characterized by: including filter circuit, rectifier circuit, step-down circuit and voltage stabilizing circuit, rectifier circuit is full-bridge rectifier circuit, rectifier circuit's first input is connected with the commercial power live wire, rectifier circuit's second input is connected with commercial power zero line, step-down circuit includes power management chip, opto-coupler isolation chip and high frequency transformer T. The power supply circuit can output direct current 5V and direct current 12V power supplies and supplies power for components such as a control chip and a relay of the range hood. The power supply circuit has the advantages of small volume and wide voltage-stabilizing input.
Description
Technical Field
The utility model relates to an oil smoke clarification plant, more specifically say, it relates to a power supply circuit of lampblack absorber.
Background
The range hood changes the large environment of a kitchen, can quickly exhaust oil smoke harmful to the kitchen environment and human bodies, discharges the oil smoke to the outside, reduces pollution, purifies air, and has the safety guarantee effects of gas defense and explosion prevention. Range hoods have become essential kitchen equipment for modern homes.
The existing range hood is generally in an electric control operation mode, a user can switch the function of the range hood by touching or pressing an operation button, the range hood is required to be provided with a power supply module, and the existing range hood power supply module is large in size and not beneficial to the compactness of the range hood.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art exists, the utility model aims to provide a power supply circuit of lampblack absorber, it has less volume.
In order to achieve the above purpose, the utility model provides a following technical scheme:
a power supply circuit of a range hood comprises a filter circuit, a rectifying circuit, a voltage reduction circuit and a voltage stabilizing circuit, wherein the rectifying circuit is a full-bridge rectifying circuit, a first input end of the rectifying circuit is connected with a live wire of a mains supply, a second input end of the rectifying circuit is connected with a zero line of the mains supply, the voltage reduction circuit comprises a power supply management chip, an optical coupling isolation chip and a high-frequency transformer T, a CS pin of the power supply management chip is connected with a second output pin of the rectifying circuit through a resistor R15, a SW pin of the power supply management chip is connected with an anode of a diode D5, a resistor R17 is connected with a capacitor C7 in series, a cathode of the diode D5 is connected with the other end of a resistor R17, and the other end of a capacitor C; the COMP pin of the power management chip is connected with the collector of an optical coupling isolation chip, the emitter of the optical coupling isolation chip is grounded, the anode of the optical coupling isolation chip is connected with the anode of a voltage stabilizing diode DZ1, the cathode of the voltage stabilizing diode DZ1 is connected with a resistor R20, the other end of the resistor R20 outputs a +12V power supply, the cathode of the optical coupling isolation chip is grounded, a resistor R19 is connected between the anode and the cathode of the optical coupling isolation chip, one end of an input side coil of the transformer is connected with the SW pin of the power management chip, the other end of the input side coil of the transformer is connected with the first output end of a rectifying circuit, one end of an output side coil of the transformer is connected with the anode of a diode D7, the cathode of a diode D7 is connected with the +12V power supply, the other end of the output side coil of the transformer is grounded, and the, the input pin of the voltage stabilizing chip is connected with the cathode of the diode D7, the GND pin of the voltage stabilizing chip is grounded, and the output pin of the voltage stabilizing chip outputs a +5V power supply.
As a preferable scheme: the first input end of the rectifying circuit is connected with a live wire of the commercial power through a first coil of a common-mode inductor L, and the second input end of the rectifying circuit is connected with a zero line of the commercial power through a second coil of the common-mode inductor L.
As a preferable scheme: the filter circuit comprises a potentiometer R13, a capacitor C4 and a resistor R14, wherein the potentiometer R13, the capacitor C4 and the resistor R14 are all provided with one end connected with a live wire of a commercial power and the other end connected with a zero wire of the commercial power.
As a preferable scheme: and a capacitor C5 is connected between the first input end and the second input end of the rectifying circuit.
As a preferable scheme: an electrolytic capacitor C6 is connected between the first output end and the second output end of the rectifying circuit.
As a preferable scheme: and a fuse wire is also connected between the live wire of the mains supply and the first input end of the rectifying circuit.
Compared with the prior art, the utility model has the advantages that: different from the scheme of stepping down earlier and then rectifying that current power module adopted, this power supply circuit adopts the rectification earlier and then steps down, can use higher operating frequency's transformer, the higher advantage that operating frequency brought is that the volume of transformer can be littleer, therefore make whole power module's volume can do littleer, be favorable to the compactification design of lampblack absorber, this kind of scheme also makes voltage stabilizing circuit's input voltage scope wideer, make power module can be applicable to more scenes.
Drawings
FIG. 1 is a schematic block diagram of a power supply in this embodiment;
FIG. 2 is a diagram of a filter and rectifier circuit according to the present embodiment;
FIG. 3 is a diagram of a buck and regulator circuit according to the present embodiment.
Detailed Description
Referring to fig. 1, a power circuit of a range hood includes a power module including a filter circuit, a common mode inductor, a rectifier circuit, a voltage reduction circuit, and a voltage stabilizing circuit.
Referring to fig. 2, the rectifying circuit is a full-bridge rectifying circuit formed by diodes D1, D2, D3 and D4, a first input end of the rectifying circuit is connected to the live wire of the commercial power through a first coil of a common-mode inductor L, and a second input end of the rectifying circuit is connected to the neutral wire of the commercial power through a second coil of the common-mode inductor L. The common mode inductor L has the function of improving the anti-electromagnetic interference performance of the power supply module, and is convenient for passing EMC tests.
In other embodiments, the common mode inductor L may be eliminated, and the first input terminal of the rectifier circuit is directly connected to the live line of the utility power, and the second input terminal of the rectifier circuit is directly connected to the zero line of the utility power.
A capacitor C5 is connected between the first input end and the second input end of the rectifying circuit, and an electrolytic capacitor C6 is connected between the first output end and the second output end of the rectifying circuit. The capacitors C5 and C6 function for pre-rectification filtering and post-rectification filtering, respectively.
The filter circuit comprises a potentiometer R13, a capacitor C4 and a resistor R14, wherein the potentiometer R13, the capacitor C4 and the resistor R14 are all connected with a live wire of the commercial power at one end and a zero line of the commercial power at the other end.
In addition, still be connected with FUSE between commercial power live wire and the first input end of rectifier circuit, when the electric current was too big, FUSE can FUSE to play the effect of protection whole circuit, avoid the circuit to burn out because of the short circuit.
Referring to fig. 3, the voltage reduction circuit includes a power management chip of model PN8149, an optical coupling isolation chip of model PC817, and a high frequency transformer T of model EF 20. A resistor R15 is connected between a pin 1 (CS) and a pin 2 (GND) of the power management chip, the pin 2 (GND) of the power management chip is connected with a second output pin of the rectifying circuit, a pin 3 (VDD) of the power management chip is grounded through a capacitor C11, an electrolytic capacitor C10 is connected with the C11 in parallel, a pin 4 (COMP) of the power management chip is grounded through a capacitor C12, a pin 7 (SW) of the power management chip is connected with a pin 8 (SW), the pin 8 (SW) of the power management chip is connected with the anode of a diode D5, a resistor R17 is connected with the capacitor C7 in series, the cathode of the diode D5 is connected with the other end of a resistor R17, and the other end of the capacitor C7 is connected with a first output end of the rectifying circuit.
No. 4 pin (COMP) of power management chip is connected with the collecting electrode of opto-coupler isolation chip, the projecting pole ground connection of opto-coupler isolation chip, the positive pole of opto-coupler isolation chip is connected with zener diode DZ 1's positive pole, zener diode DZ 1's negative pole connecting resistance R20, resistance R20's other end output +12V power, the negative pole ground connection of opto-coupler isolation chip is connected with resistance R19 between opto-coupler isolation chip's positive pole and the negative pole. The output +12V power supply is used for supplying power to the relay unit and is used as an input power supply of the voltage stabilizing circuit.
The No. 3 pin of the power management chip is connected with the cathode of the diode D6 through a resistor R18, and the anode of the diode D6 is grounded.
One end of a high-voltage side coil Q1 of the transformer T is connected with a pin No. 8 (SW) of the power management chip, the other end of a coil Q1 is connected with a first output end of the rectifying circuit, a capacitor C8 is connected with a capacitor C9 in series, the other end of a capacitor C8 is connected with the first output end of the rectifying circuit, the other end of a capacitor C9 is grounded, one end of a high-voltage side coil Q2 of the transformer T is grounded, the other end of Q2 is connected with the anode of a diode D6, the cathode of the diode D6 is connected with a pin No. 3 (VDD) of the power management chip through a resistor R18, one end of a low-voltage side coil Q3 of the transformer T is connected with the anode of a diode D7, and the cathode.
The voltage stabilizing circuit comprises a voltage stabilizing chip, the model of the voltage stabilizing chip is 7805, a +12V power supply is connected with a pin No. 1 of the voltage stabilizing chip, the other end of a coil Q3 is connected with a pin No. 2 of the voltage stabilizing chip, the pin No. 2 of the voltage stabilizing chip is grounded, a capacitor C13 is connected with the voltage stabilizing chip, an electrolytic capacitor C14 is connected with the capacitor C13 in parallel, a capacitor C15 is connected between the pin No. 2 and the pin No. 3 of the voltage stabilizing chip, a capacitor C16 is connected with the capacitor C15 in parallel, and the pin No. 3 of the voltage stabilizing chip outputs the +5V power supply.
The working principle of the power supply module is as follows: commercial power alternating current passes through the filtering of filter circuit, common mode inductor's choke and filtering in proper order, and high-voltage alternating current is converted into low-voltage direct current by the rectifier bridge again, low-voltage direct current is input to the one end of coil Q1, and the SW pin output pulse voltage of power management chip simultaneously for coil Q1 produces the alternating current, after the step-down of transformer, produce the alternating current that the voltage is lower on coil Q3, the alternating current on coil Q3 becomes the direct current after diode D7's rectification, export +5V DC power supply at No. 3 pin (Vout) of voltage stabilizing chip.
The power supply circuit can output direct current 5V and direct current 12V power supplies and supplies power for components such as a control chip and a relay of the range hood.
It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A power supply circuit of a range hood is characterized in that: the voltage reduction circuit comprises a power management chip, an optical coupling isolation chip and a high-frequency transformer T, a CS pin of the power management chip is connected with a second output pin of the rectification circuit through a resistor R15, a SW pin of the power management chip is connected with the anode of a diode D5, a resistor R17 is connected with a capacitor C7 in series, the cathode of the diode D5 is connected with the other end of a resistor R17, and the other end of the capacitor C7 is connected with the first output end of the rectification circuit; the COMP pin of the power management chip is connected with the collector of an optical coupling isolation chip, the emitter of the optical coupling isolation chip is grounded, the anode of the optical coupling isolation chip is connected with the anode of a voltage stabilizing diode DZ1, the cathode of the voltage stabilizing diode DZ1 is connected with a resistor R20, the other end of the resistor R20 outputs a +12V power supply, the cathode of the optical coupling isolation chip is grounded, a resistor R19 is connected between the anode and the cathode of the optical coupling isolation chip, one end of an input side coil of the transformer is connected with the SW pin of the power management chip, the other end of the input side coil of the transformer is connected with the first output end of a rectifying circuit, one end of an output side coil of the transformer is connected with the anode of a diode D7, the cathode of a diode D7 is connected with the +12V power supply, the other end of the output side coil of the transformer is grounded, and the, the input pin of the voltage stabilizing chip is connected with the cathode of the diode D7, the GND pin of the voltage stabilizing chip is grounded, and the output pin of the voltage stabilizing chip outputs a +5V power supply.
2. The power supply circuit of a range hood according to claim 1, characterized in that: the first input end of the rectifying circuit is connected with a live wire of the commercial power through a first coil of a common-mode inductor L, and the second input end of the rectifying circuit is connected with a zero line of the commercial power through a second coil of the common-mode inductor L.
3. The power supply circuit of a range hood according to claim 1, characterized in that: the filter circuit comprises a potentiometer R13, a capacitor C4 and a resistor R14, wherein the potentiometer R13, the capacitor C4 and the resistor R14 are all provided with one end connected with a live wire of a commercial power and the other end connected with a zero wire of the commercial power.
4. The power supply circuit of a range hood according to claim 1, characterized in that: and a capacitor C5 is connected between the first input end and the second input end of the rectifying circuit.
5. The power supply circuit of a range hood according to claim 1, characterized in that: an electrolytic capacitor C6 is connected between the first output end and the second output end of the rectifying circuit.
6. The power supply circuit of a range hood according to claim 1, characterized in that: and a fuse wire is also connected between the live wire of the mains supply and the first input end of the rectifying circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022359500.8U CN213342042U (en) | 2020-10-21 | 2020-10-21 | Power supply circuit of range hood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022359500.8U CN213342042U (en) | 2020-10-21 | 2020-10-21 | Power supply circuit of range hood |
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| Publication Number | Publication Date |
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| CN213342042U true CN213342042U (en) | 2021-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022359500.8U Active CN213342042U (en) | 2020-10-21 | 2020-10-21 | Power supply circuit of range hood |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114582070A (en) * | 2022-02-28 | 2022-06-03 | 无锡市恒通电器有限公司 | Single-phase guide rail type intelligent electric energy meter supporting quota management |
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2020
- 2020-10-21 CN CN202022359500.8U patent/CN213342042U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114582070A (en) * | 2022-02-28 | 2022-06-03 | 无锡市恒通电器有限公司 | Single-phase guide rail type intelligent electric energy meter supporting quota management |
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