Range hood comprehensive power supply circuit and range hood applying same

Abstract

The utility model provides a range hood comprehensive power supply circuit and a range hood using the same, and relates to the technical field of range hoods. Comprising a transformer which provides a primary main winding, a primary secondary winding and a secondary winding; the primary main winding is electrically connected to the power supply unit, and the power supply unit is electrically connected to the power supply interface and supplies power to the control unit; the primary secondary winding is electrically connected to a control unit for controlling the output of the transformer and a second output unit for providing driving power supply for a load; and the secondary winding is electrically connected to the first output unit to provide + 12VDC output, and is electrically connected to the control unit in an optocoupler isolation manner. A controller power supply mode is solved, a switching power supply auxiliary winding is shared to supply power to a motor driving circuit, the transformer structure is optimized, the circuit is simplified, the cost is saved, and the requirements of circuit power supply and safety regulation are met.

Description

TECHNICAL FIELD

[0001] The utility model relates to range hood technical field, specifically, range hood comprehensive power supply circuit and the range hood of applying it. BACKGROUND

[0002] The main function of the range hood is to suck and exhaust oil fume. During cooking, a large amount of oil fume, hot gas and peculiar smell will be produced. The range hood generates strong suction force through the built-in fan system, quickly sucks away the oil fume, hot gas and peculiar smell, and discharges them to the outdoor or filters them through the pipeline. This not only keeps the kitchen air fresh and reduces the harm of oil fume to human health, but also avoids the deposition of oil fume on the surface of kitchen walls, furniture and other surfaces, keeping the kitchen clean and sanitary. The range hood is widely used in household kitchens, restaurant kitchens, hotel kitchens and other places. In the household kitchen, the range hood is one of the indispensable electrical appliances, which can effectively improve the kitchen environment and protect the health of family members. In commercial places such as restaurant kitchens and hotel kitchens, the performance and efficiency of the range hood are required to be higher, which needs to meet the demand of exhaust of oil fume produced by a large amount of cooking.

[0003] The general power supply circuit structure of the range hood household electrical appliance is powered by a switching power supply, and two output windings in the switching power supply transformer are coupled and rectified to supply power to each module circuit. The original circuit structure has two coupled windings on the secondary side of the transformer to supply power to the motor drive circuit and the main control MCU. On the one hand, the circuit structure is complex, and the more windings on the transformer, the more complex the structure of the transformer, and the manufacturing difficulty and cost increase accordingly. On the other hand, the two coupled windings supply power to different module circuits, and the stability of the coupling may have problems. For example, temperature change, electromagnetic interference, etc. may affect the coupling effect, resulting in unstable output voltage. On the other hand, during energy transmission, due to the resistance, leakage inductance and other factors of the winding, a certain amount of energy will be lost. Especially in the case of simultaneous power supply of high-power motor drive circuit and main control MCU with high requirements for power quality, the problem of energy transmission efficiency may be more prominent, affecting the energy efficiency performance of the whole range hood. Therefore, the utility model provides a range hood comprehensive power supply circuit and a range hood applying the same to at least partially solve the problems in the prior art. SUMMARY

[0004] In order to overcome the above problems or at least partially solve the above problems, the utility model embodiment provides a range hood comprehensive power supply circuit and a range hood applying the same.

[0005] The embodiment of the utility model is realized as follows:

[0006] The embodiment of the present application provides a range hood comprehensive power supply circuit, which comprises:

[0007] A transformer, which provides a primary main winding and a primary secondary winding and a secondary winding;

[0008] The primary main winding is electrically connected to a power supply unit, which is electrically connected to a power supply interface position and provides power supply for a control unit;

[0009] The primary secondary winding is electrically connected to a control unit for controlling the output of the transformer and a second output unit for providing driving power supply for a load;

[0010] The secondary winding is electrically connected to the first output unit to provide a +12VDC output and is electrically connected to the control unit through an optocoupler;

[0011] Wherein, the circuit on the primary winding side of the transformer is grounded to a first DC ground, and the circuit on the secondary winding side of the transformer is grounded to a second DC ground; the first DC ground and the second DC ground are isolated by a capacitor.

[0012] In some embodiments of the utility model, the control unit comprises: a control circuit from one end of the primary main winding to the D pin of the primary side feedback control chip, and then to the first DC ground;

[0013] A feedback circuit from the first output unit to the first end of the optocoupler, and then from the second end of the optocoupler to the feedback pin of the primary side feedback control chip and the first DC ground;

[0014] A power supply circuit of the control chip is formed from the other end of the primary main winding to the third resistor, the seventh resistor to the power supply pin of the primary side feedback control chip, and then to the first DC ground, and from one end of the primary secondary winding to the third diode, to the ninth resistor, to the power supply pin of the primary side feedback control chip, and then to the first DC ground, wherein the other end of the primary secondary winding is electrically connected to the first DC ground.

[0015] In some embodiments of the utility model, the second output unit comprises electrical connection from one end of the primary secondary winding to the first DC ground, and the other end of the primary secondary winding provides a DC 17-20V output through a first peak absorption rectifier circuit for providing driving power supply for a load.

[0016] In some embodiments of the utility model, the first peak absorption rectifier circuit comprises a fourth diode and a first RC unit connected in parallel thereto, the first RC unit is composed of an eighth resistor R8 and a fifth capacitor connected in series; the anode of the fourth diode is electrically connected to the other end of the primary secondary winding.

[0017] In some embodiments of the utility model, the power supply unit comprises:

[0018] One end of the primary main winding is electrically connected to an anode of a second diode, a cathode of the second diode, a first end of a fifth resistor, a second end of the fifth resistor is electrically connected to a second end of the first capacitor and a second end of the first resistor.

[0019] One end of the primary main winding is electrically connected to an anode of a second diode, a cathode of the second diode, a first end of a fifth resistor, a second end of the fifth resistor is electrically connected to a second end of the first capacitor and a second end of the first resistor.

[0020] In some embodiments of the utility model, the first output unit comprises:

[0021] One end of the secondary winding is provided with a +12V power supply end through a second peak value absorption rectifier circuit;

[0022] The other end of the secondary winding is electrically connected to a second DC ground.

[0023] In some embodiments of the utility model, further comprising an output adjusting circuit;

[0024] The +12V power supply end is electrically connected to a tenth resistor and a first end of an eleventh resistor; a second end of the tenth resistor is electrically connected to a first input pin of a first end of a thirteenth resistor and an optical coupler, a second end of the eleventh resistor is electrically connected to a first end of a fifteenth resistor, a first end of a nineteenth resistor and a reference end of a controllable precision voltage regulator;

[0025] A second end of the fifteenth resistor is electrically connected to a second input pin of the first end of the optical coupler through a tenth capacitor; a second end of the thirteenth resistor is electrically connected to a cathode of the controllable precision voltage regulator;

[0026] A second end of the nineteenth resistor and an anode of the controllable precision voltage regulator are electrically connected to the second DC ground.

[0027] The embodiment of the application further provides a range hood, which comprises a shell, a circuit board arranged in the shell and used for providing power supply and driving, and the oil fume machine comprehensive power supply circuit is arranged on the circuit board.

[0028] Compared with the prior art, the embodiment of the utility model has at least the following advantages or beneficial effects:

[0029] By the transformer, it provides a primary main winding and a primary secondary winding and a secondary winding; the primary main winding is electrically connected to the power supply unit, the power supply unit is electrically connected to the power supply interface position, and the power supply unit provides power supply for the control unit; the primary secondary winding is electrically connected to the control unit for controlling the output of the transformer, and a second output unit for providing driving power supply for the load; the secondary winding is electrically connected to the first output unit to provide +12VDC output, and is electrically connected to the control unit through an optical coupling isolation; wherein the circuit on the primary winding side of the transformer is grounded as a first DC ground; the circuit on the secondary winding side of the transformer is grounded as a second DC ground; the first DC ground and the second DC ground are isolated by a capacitor. The power supply mode of the controller is solved, the auxiliary winding of the common switching power supply is used to supply power for the motor driving circuit, the structure of the transformer is optimized, the circuit is simplified, the cost is saved, and the requirements of circuit power supply and safety regulations are met. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0031] Figure 1 A unit structure schematic diagram of an oil fume exhaust fan comprehensive power supply circuit provided in an embodiment of the present application;

[0032] Figure 2 A circuit diagram of an oil fume exhaust fan comprehensive power supply circuit provided in an embodiment of the present application.

[0033] In the figure: 100, power supply unit; 200, control unit; 300, first output unit; 400, second output unit; T1, transformer. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical scheme in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0035] Embodiment 1

[0036] Some embodiments of the present application will be described in detail with reference to the drawings. In the following, each of the embodiments described below and each of the features in the embodiments can be combined with each other as long as there is no conflict.

[0037] Please refer to Figure 1 The utility model discloses an oil fume exhaust fan comprehensive power supply circuit, which comprises a transformer T1, which provides a primary main winding, a primary secondary winding and a secondary winding; the primary main winding is electrically connected to a power supply unit 100, the power supply unit 100 is electrically connected to a power supply interface position P, and the power supply unit 100 provides power supply for a control unit 200; the primary secondary winding is electrically connected to the control unit 200 for controlling the output of the transformer, and a second output unit 400 for providing driving power supply for a load; the secondary winding is electrically connected to a first output unit 300 to provide a +12VDC output, and is electrically connected to the control unit 200 through an optical coupling PT1; wherein the circuit on one side of the primary winding of the transformer T1 is grounded as a first DC ground; the circuit on one side of the secondary winding of the transformer T1 is grounded as a second DC ground; the first DC ground and the second DC ground are isolated by a capacitor.

[0038] In the embodiment, only the primary secondary winding of the transformer T1 is needed, and one winding of the secondary winding for providing driving power supply for the motor is cancelled (i.e., multiple outputs use multiple windings for output), and the winding of the common power supply auxiliary power supply is rectified by the second output unit to provide power supply for the motor driving circuit, which simplifies the circuit structure and the winding process of the transformer T1, saves the product cost, and meets the application occasions and safety requirements. Compared with the design of two coupled windings in the prior art, the circuit structure is greatly simplified. The winding process of the transformer T1 also becomes simpler, the number of windings is reduced, and the manufacturing difficulty and cost are reduced; on the other hand, by reducing the number of windings, the unstable factors caused by the coupling of multiple windings are reduced. At the same time, the control unit and the secondary winding are connected in an optical coupling PT1 isolation mode in the scheme, which further enhances the anti-interference ability of the circuit, reduces the influence of temperature change, electromagnetic interference and the like on the coupling effect, and thus improves the stability of the output voltage; on the other hand, the simplified circuit reduces the influence of factors such as resistance and leakage inductance of the winding on energy transmission. The winding of the common power supply auxiliary power supply is rectified by the second output unit to provide power supply for the motor driving circuit, which makes the energy transmission more efficient. Especially in the case of simultaneously supplying power to the high-power motor driving circuit and the main control MCU which has high requirements for power supply quality, the energy efficiency of the entire oil fume exhaust fan can be effectively improved; the simplified circuit structure is more in line with the requirements of the application occasions of the oil fume exhaust fan, and it is also easier to meet the related safety specification requirements. For example, reducing the complex winding structure can reduce the electrical safety risk and improve the safety of the product.

[0039] Embodiment 2

[0040] The utility model discloses an oil smoke machine comprehensive power supply circuit, refer to Figure 2 As shown in the figure, the control unit 200 comprises: from one end of the primary main winding to the D pin of the primary side feedback control chip U3, and then to the control loop of the first DC ground; from the first output unit 300 to the first end of the optical coupler PT1, and then from the second end of the optical coupler PT1 to the feedback pin FB of the primary side feedback control chip U3 and the feedback loop of the first DC ground; from the other end of the primary main winding to the third resistor R3, the seventh resistor R7, the power supply pin VDD of the primary side feedback control chip U3, and then to the first DC ground, and from one end of the primary secondary winding to the third diode D3, the ninth resistor R9, the power supply pin VDD of the primary side feedback control chip U3, and then to the first DC ground in sequence, forming the power supply loop of the control chip, wherein the other end of the primary secondary winding is electrically connected to the first DC ground, one end of the sixth capacitor C6 is electrically connected to the other end of the seventh resistor R7, and the other end of the sixth capacitor C6 is electrically connected to the first DC ground; one end of the ninth resistor R9 is electrically connected to the fourth electrolytic capacitor EC4, and the other end of the fourth electrolytic capacitor EC4 is electrically connected to the first DC ground.

[0041] In the embodiment, the power supply unit 100, the control unit 200, and the second output unit 400 are isolated from the first output unit 300 by the transformer T1 and the optical coupler TP1, and the first output unit 300 is electrically connected to the feedback of the control unit 200 through the optical coupler TP1, so that the power supply is isolated, the feedback signal is also isolated, and the safety of the first output unit power supply is ensured.

[0042] The feedback pin FB of the primary side feedback control chip U3 receives the feedback signal from the optical coupler PT1, can adjust the working state of the primary side according to the output condition of the secondary winding, and thus stabilizes the output voltage. Meanwhile, the power supply loop supplies power to the chip from the primary main winding and the primary secondary winding respectively, ensures the stable power supply of the chip under different working states, and improves the reliability of the circuit.

[0043] The sixth capacitor C6 and the fourth electrolytic capacitor EC4 are filter and compensation capacitors connected to the power supply pin VDD of the primary side feedback control chip U3, can ensure that the primary side feedback control chip U3 can obtain stable power supply and work stably, the third resistor R3 and the seventh resistor R7 can be large-value resistors of 2MΩ respectively, prevent the voltage at the power supply end P position from being too high, and the two resistors and the sixth capacitor C6 can be equivalent to resistors connected in series for voltage division; the primary secondary winding is connected to the third diode D3 and then connected in series with the ninth resistor R9 as another power supply loop for supplying power to the primary side feedback control chip U3, the fourth electrolytic capacitor EC4 can play a role in stabilizing the voltage, reduces the influence of voltage fluctuation on the primary side feedback control chip U3, and further improves the stability and reliability of the circuit.

[0044] In some high-voltage stability requirements of the range hood application scenarios, such as high-end intelligent range hood, accurate control and stable power supply characteristics can ensure the normal operation of various intelligent functions of the range hood. For example, the intelligent control panel needs stable power supply to ensure the sensitivity and accuracy of touch operation, and the clear display of the display screen, which can provide reliable power supply guarantee for these functions.

[0045] As a preferred embodiment, the second output unit 400 includes an electrical connection from one end of the primary secondary winding to the first DC ground, and the other end of the primary secondary winding provides a DC 17-20V output through the first peak absorption rectifier circuit for driving power supply for the load. The primary secondary winding provides a DC 17-20V output through the first peak absorption rectifier circuit for driving power supply for the load. The fourth diode D4 and the first RC unit (eighth resistor R8 and fifth capacitor C5) in the first peak absorption rectifier circuit can effectively absorb peak voltage, reduce electromagnetic interference, and improve rectification efficiency. At the same time, the fourth diode D4 can rectify at this position, so that the current output is more stable, and the stable DC 17-20V output can meet the driving requirements of the motor and other loads, ensuring that the motor of the range hood can operate efficiently.

[0046] The peak absorption rectifier circuit can protect other elements in the circuit from high peak voltage impact, prolonging the service life of the elements. For example, when the motor starts or the load changes, a momentary high voltage may be generated, and the peak absorption rectifier circuit can effectively absorb these peak voltages to protect the transistors, diodes and other elements in the motor drive circuit from being damaged. As an application, in the kitchen of a large restaurant, the amount of oil fume is large, and the motor needs to be frequently started and stopped. The circuit design of scheme three can provide stable power supply for the motor while protecting the circuit elements from being damaged, improving the reliability and service life of the range hood.

[0047] As a preferred embodiment, the first peak absorption rectifier circuit includes a fourth diode D4 and a first RC unit connected in parallel thereto, the first RC unit being composed of an eighth resistor R8 and a fifth capacitor C5 connected in series; and an anode of the fourth diode D4 is electrically connected to the other end of the primary secondary winding.

[0048] The fourth diode D4 in the first peak absorption rectifier circuit rectifies the output to output corresponding pulses, and the first RC unit composed of the eighth resistor R8 and the fifth capacitor C5 connected in series is connected in parallel to absorb the peak of the pulses. For example, the above-mentioned eighth resistor R8 can be preferably 20Ω, and the above-mentioned first RC unit can absorb the peak voltage and stable voltage for a long time, and the cooperation of the two can better protect the circuit elements and improve the rectification efficiency.

[0049] Embodiment 3

[0050] The utility model embodiment provides a kind of comprehensive power supply circuit of extractor hood, refer to Figure 2 As shown in the figure, the power supply unit 100 includes: from the power supply interface position P electrically connected to the positive pole of the first electrolytic capacitor EC1, one end of the first capacitor C1, one end of the first resistor R1 and the other end of the primary main winding;One end of the primary main winding is electrically connected to the anode of the second diode D2, the cathode of the second diode D2 is electrically connected to one end of the fifth resistor R5, and the other end of the fifth resistor R5 is electrically connected to the other end of the first capacitor C1 and the other end of the first resistor R1.

[0051] The power supply unit 100 is connected from the power supply interface position P to the first electrolytic capacitor EC1, the first capacitor C1, the first resistor R1 and the other end of the primary main winding, forming an input filter and protection circuit. The first electrolytic capacitor EC1 and the first capacitor C1 can filter the input power supply, reduce the clutter and interference in the power supply, and improve the power supply quality. The first resistor R1 can play a role in current limiting protection when the circuit fails, to prevent excessive current from damaging the circuit components.

[0052] The above-mentioned primary main winding, the second diode D2, the first capacitor C1, the first resistor R1 and the fifth resistor R5 electrically connected thereto form an RLC oscillation circuit;The primary main winding and the primary side feedback control chip U3 connected thereto perform winding oscillation control so that the secondary side winding and the secondary winding can generate pulse output;C6 can play a role in stabilizing voltage, reducing the influence of voltage fluctuation on the primary side feedback control chip U3.

[0053] As a more preferred embodiment, the first output unit 300 includes: one end of the secondary winding is provided with a +12V power supply end through a second peak value absorption rectifier circuit;The other end of the secondary winding is electrically connected to a second DC ground. The second peak value absorption rectifier circuit includes a first diode D1 and a second RC unit connected in parallel thereto, the second RC unit is composed of a fourth capacitor C4 and a sixth resistor R6 in series;The anode of the first diode D1 is electrically connected to one end of the secondary winding. The above-mentioned +12V power supply end is also electrically connected with a second electrolytic capacitor EC2, a third electrolytic capacitor EC3 and one end of a third capacitor C3, and the other end is electrically connected to the second DC ground.

[0054] The first output unit 300 provides a +12V power supply end through the second peak absorption rectifier circuit, one end of the secondary winding is connected with a first diode D1 and a second RC unit composed of a fourth capacitor C4 and a sixth resistor R6 in series, and high-efficiency secondary rectification output is realized.

[0055] As a preferred embodiment, as shown in Figure 2 The output regulation circuit is electrically connected to one end of a tenth resistor R10 and one end of an eleventh resistor R11, the other end of the tenth resistor R10 is electrically connected to one end of a thirteenth resistor R13 and a first input pin of a first end of an optical coupler PT1, the other end of the eleventh resistor R11 is electrically connected to one end of a fifteenth resistor R15, one end of a nineteenth resistor R19 and a reference end of a controllable precision voltage regulator U4, the other end of the fifteenth resistor R15 is electrically connected to a second input pin of the first end of the optical coupler PT1 through a tenth capacitor C10, the other end of the thirteenth resistor R13 is electrically connected to a cathode of the controllable precision voltage regulator U4, and the other end of the nineteenth resistor R19 and an anode of the controllable precision voltage regulator U4 are electrically connected to the second DC ground.

[0056] The output regulation circuit can realize accurate output regulation of the +12V power supply end by cooperation of the tenth resistor R10, the eleventh resistor R11, the thirteenth resistor R13, the fifteenth resistor R15, the nineteenth resistor R19 and the controllable precision voltage regulator U4, which is preferably TL431.

[0057] The optical coupler PT1 plays a role of feedback control in the output regulation circuit, and can transmit a feedback signal to a primary side feedback control chip U3 by monitoring pulse voltage variation of the +12V power supply end, so as to adjust a working state of the primary side and realize accurate control of the output voltage.

[0058] Embodiment 4

[0059] Based on the same concept, the utility model provides a kind of range hood, including shell, and be set to its inside and be used to provide energization and drive circuit board;The circuit board is provided with above-mentioned comprehensive power supply circuit of range hood.

[0060] In the application, the power supply mode of the controller is solved, the auxiliary winding of the common switching power supply is used to supply power for the motor driving circuit, the transformer structure is optimized, the circuit is simplified, the cost is saved, the requirements of circuit power supply and safety are met; through the power supply mode of the common auxiliary winding, the same power supply function can be realized, the circuit structure can be simplified, the winding process of the transformer is optimized, the cost is saved, and the safety requirements can be met.

[0061] It should be noted that each embodiment in the specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between each embodiment can be referred to each other. Although the optional embodiments of the utility model have been described, once the basic creative concept is known, those skilled in the art can make other changes and modifications to the embodiments. Therefore, the appended claims are intended to include optional embodiments and all changes and modifications falling within the scope of the utility model embodiments.

[0062] Finally, it should be noted that in this paper, relationship terms such as first and second are only used to distinguish one entity from another, and do not necessarily require or imply any such actual relationship or order between the entities. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the article or terminal device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such article or terminal device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the article or terminal device including the element.

[0063] The above describes the technical solutions provided by the utility model in detail, and the principles and implementation modes of the utility model are described by applying specific examples, and for those skilled in the art, according to the principles and implementation modes of the utility model, the specific implementation modes and application scope will be changed, and the content of the specification should not be understood as a limitation of the utility model.

Claims

1. A comprehensive power supply circuit for a range hood, characterized in that, include: A transformer that provides a primary main winding, a primary secondary winding, and a secondary winding; The primary winding is electrically connected to the power supply unit, which is electrically connected to the power supply interface and provides power to the control unit. The primary and secondary windings are electrically connected to a control unit for controlling the transformer output and a second output unit for providing drive power to the load. The secondary winding is electrically connected to the first output unit to provide a +12VDC output, and is electrically connected to the control unit via optocoupler isolation. Specifically, the circuit on the primary winding side of the transformer is grounded as a first DC ground; the circuit on the secondary winding side of the transformer is grounded as a second DC ground; the first DC ground and the second DC ground are isolated by a capacitor.

2. The integrated power supply circuit for a range hood according to claim 1, characterized in that, The control unit includes a control loop extending from one end of the primary main winding to the D pin of the primary side feedback control chip, and then to the first DC ground. The feedback loop extends from the first output unit to the first end of the optocoupler, and then from the second end of the optocoupler to the feedback pin of the primary-side feedback control chip and the first DC ground. The power supply circuit for the control chip is formed by sequentially connecting the other end of the primary winding to the third resistor, the seventh resistor, the power supply pin of the primary feedback control chip, and then to the first DC ground. The circuit also connects the other end of the primary secondary winding to the third diode, the ninth resistor, the power supply pin of the primary feedback control chip, and then to the first DC ground. The other end of the primary secondary winding is electrically connected to the first DC ground.

3. The integrated power supply circuit for a range hood according to claim 1 or 2, characterized in that, The second output unit includes an electrical connection from one end of the primary and secondary windings to a first DC ground, and the other end of the primary and secondary windings provides a DC17-20V output through a first peak absorption rectifier circuit for providing drive power to the load.

4. The integrated power supply circuit for a range hood according to claim 3, characterized in that, The first peak absorption rectifier circuit includes a fourth diode and a first RC unit connected in parallel therewith. The first RC unit is composed of an eighth resistor and a fifth capacitor connected in series. The anode of the fourth diode is electrically connected to the other end of the primary and secondary windings.

5. The integrated power supply circuit for a range hood according to claim 1 or 2, characterized in that, The power supply unit includes: Electrically connect from the power supply interface to the positive terminal of the first electrolytic capacitor EC1, one end of the first capacitor, one end of the first resistor, and the other end of the primary main winding; One end of the primary winding is electrically connected to the anode of the second diode, the cathode of the second diode, and one end of the fifth resistor. The other end of the fifth resistor is electrically connected to the other end of the first capacitor and the other end of the first resistor.

6. The integrated power supply circuit for a range hood according to claim 1, characterized in that, The first output unit includes: One end of the secondary winding is supplied with a +12V power supply through a second peak absorption rectifier circuit; The other end of the secondary winding is electrically connected to a second DC ground.

7. The integrated power supply circuit for a range hood according to claim 6, characterized in that, It also includes an output regulation circuit; The +12V power supply terminal is electrically connected to one end of the tenth resistor and the eleventh resistor; the other end of the tenth resistor is electrically connected to one end of the thirteenth resistor and the first input pin of the first terminal of the optocoupler; the other end of the eleventh resistor is electrically connected to one end of the fifteenth resistor, one end of the nineteenth resistor and the reference terminal of the controllable precision voltage regulator. The other end of the fifteenth resistor is electrically connected to the second input pin of the first end of the optocoupler through the tenth capacitor; the other end of the thirteenth resistor is electrically connected to the cathode of the controllable precision voltage regulator. The other end of the nineteenth resistor and the anode of the controllable precision voltage regulator are electrically connected to the second DC ground.

8. A range hood, characterized in that, It includes a housing and a circuit board disposed therein for providing power and drive; the circuit board is provided with a range hood integrated power supply circuit as described in any one of claims 1 to 7.

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