Power supply circuit of air purifier
By integrating a PWM pulse width modulation module and multiple power output modules into the air purifier power circuit design, the problems of high cost and large space occupation in traditional designs are solved, achieving higher cost performance and compactness.
Patent Information
- Application Number
- CN202520269830.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-19
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2035-02-19
AI Technical Summary
Traditional air purifier power supply designs require multiple voltage conversion circuits and voltage conversion chips, resulting in high production costs, large space occupation, and affecting cost-effectiveness and overall compactness.
It adopts an integrated PWM pulse width modulation module and multiple power output modules, and realizes multiple voltage outputs through PWM pulse width modulation chip and primary winding, reducing the use of voltage conversion circuits and chips.
It effectively saves overall cost and space, and improves the cost-effectiveness and compactness of air purifiers.
Smart Images
Figure CN223758174U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to air purifier technical field, concretely relates to a kind of air purifier power supply circuit. BACKGROUND
[0002] With the increasing attention of people to indoor air quality, air purifier as the important equipment for improving indoor air quality, is widely used in family, office, commercial place and various environments etc..Air purifier is usually composed of multiple components, including fan, electric control system, sensor, filter screen, power management module etc., and the normal operation of these components is crucial to the performance of air purifier.
[0003] In order to realize the power supply of these internal components, air purifier needs to convert external power supply into suitable voltage for each component to work. However, traditional power supply design scheme often needs multiple voltage conversion circuits and voltage conversion chips to provide stable voltage for different electrical modules.
[0004] This way needs multiple voltage conversion circuits and voltage conversion chips, and the overall production cost will increase with each additional conversion circuit or chip, thereby affecting the performance price ratio of air purifier.
[0005] In addition, multiple voltage conversion circuits and chips will occupy more circuit board space, leading to complex internal structure of air purifier, which may affect its appearance design and overall compactness. SUMMARY
[0006] The utility model aims at the above insufficient in prior art, provides a kind of air purifier power supply circuit.
[0007] The utility model aims at the above insufficient in prior art, provides a kind of air purifier power supply circuit.
[0008] The first power input port and the second power input port are respectively connected with the input end of the PWM pulse width modulation module;The first power output module, the second power output module and the third power output module are respectively connected with the output end of the PWM pulse width modulation module.
[0009] The utility model further sets up, PWM pulse width modulation module includes PWM pulse width modulation chip U11 and primary winding, be equipped with resistance R1 between first power input and second power input, first power input and one end of primary winding are connected, the other end of primary winding is connected with the output end of PWM pulse width modulation chip U11, the power end of PWM pulse width modulation chip U11 is connected with second power input.
[0010] The utility model further sets up, the first power output module includes first rectifier filter module, first positive power output, first negative power output, first main filter capacitor EC14 and the first secondary winding that coordinates with primary winding,
[0011] The first rectifier filter module includes diode D13, capacitor C12 and resistance R11,
[0012] One end of the first secondary winding is connected with the first positive power output after passing diode D13, capacitor C12 and resistance R11 are connected and are arranged at the two ends of diode D13, the other end of the first secondary winding is connected with the first negative power output, the first main filter capacitor EC14 is arranged between the first positive power output and the first negative power output.
[0013] The utility model further sets up, the first power output module still includes resistance R15, resistance R16, triode Q11 and first opto-coupler transmitter U12A, one end of resistance R15 is connected with the first positive power output, the other end of resistance R15 is connected with the base of triode Q11 after passing resistance R16, the collector of triode Q11 is grounded after passing first opto-coupler transmitter U12A, the emitter of triode Q11 is connected with the base of triode Q11 after passing resistance R16, the emitter of triode Q11 is connected with power supply,
[0014] The PWM pulse width modulation module still includes the first opto-coupler receiver U12B that coordinates with the first opto-coupler transmitter U12A, the feedback end of PWM pulse width modulation chip U11 is grounded after passing the first opto-coupler receiver U12B.
[0015] The utility model further sets up, the second power output module includes second rectifier filter module, second positive power output, second negative power output, second main filter capacitor EC24 and the second secondary winding that coordinates with primary winding,
[0016] The second rectifier filter module includes diode D23, capacitor C22 and resistance R21,
[0017] One end of the second secondary winding is connected with the second positive power output port through diode D23; the capacitor C22 is connected with the resistor R21 and is arranged at both ends of the diode D23; the other end of the second secondary winding is connected with the second negative power output port; the second main filter capacitor EC24 is arranged between the second positive power output port and the second negative power output port.
[0018] The utility model further sets up, second power output module still includes resistance R25, resistance R26, triode Q21 and second photoelectric coupler transmitter U22A, one end of resistance R25 is connected with second positive power output port, the other end of resistance R25 is connected with the base of triode Q21 through resistance R26, the collector of triode Q21 is connected with ground through second photoelectric coupler transmitter U22A, the emitter of triode Q21 is connected with the base of triode Q21 through resistance R26, the emitter of triode Q21 is connected with power supply,
[0019] The PWM pulse width modulation module further includes a second photoelectric coupler receiver U22B cooperating with the second photoelectric coupler transmitter U22A; the feedback end of the PWM pulse width modulation chip U11 is grounded through the second photoelectric coupler receiver U22B.
[0020] The utility model further sets up, third power output module includes third rectifier filter module, third positive power output port, third negative power output port, third main filter capacitor EC34 and with primary winding cooperation third secondary winding,
[0021] The third rectifier filter module includes a diode D33, a capacitor C32, and a resistor R31.
[0022] One end of the third secondary winding is connected with the third positive power output port through diode D33; the capacitor C32 is connected with the resistor R31 and is arranged at both ends of the diode D33; the other end of the third secondary winding is connected with the third negative power output port; the third main filter capacitor EC34 is arranged between the third positive power output port and the third negative power output port.
[0023] The utility model further sets up, third power output module still includes resistance R35, resistance R36, triode Q31 and third photoelectric coupler transmitter U32A, one end of resistance R35 is connected with third positive power output port, the other end of resistance R35 is connected with the base of triode Q31 through resistance R36, the collector of triode Q31 is connected with ground through third photoelectric coupler transmitter U32A, the emitter of triode Q31 is connected with the base of triode Q31 through resistance R36, the emitter of triode Q31 is connected with power supply,
[0024] The PWM pulse width modulation module further comprises a third optocoupler receiver U32B matched with a third optocoupler transmitter U32A; and the feedback end of the PWM pulse width modulation chip U11 is connected to the ground through the third optocoupler receiver U32B.
[0025] The utility model further sets up, still include RCD absorption module, the RCD absorption module includes diode D1, resistance R3 and capacitor C1, the positive pole of diode D1 is connected with the other end of primary winding, diode D1 negative pole passes through resistance R3 and capacitor C1 in proper order and is connected with the one end of primary winding.
[0026] The utility model discloses the beneficial effects: the utility model discloses a first power output module, second power output module and third power output module are integrated together, do not need to set up multiple voltage conversion circuit and voltage conversion chip again, effectively save the cost of whole and the space of whole. BRIEF DESCRIPTION OF DRAWINGS
[0027] The utility model makes further explanation to the utility model with the drawings, but the embodiment in the drawing does not constitute any limit to the utility model, and other drawings can be obtained according to the following drawings without the premise of paying the creative labor for the ordinary skilled person in the art.
[0028] Figure 1 It is the circuit schematic diagram of the utility model;
[0029] Among them: 11, first power input; 12, second power input; 21, first positive power output; 22, first negative power output; 31, second positive power output; 32, second negative power output; 41, third positive power output; 42, third negative power output; 51, first green LED; 52, second green LED; 61, first red LED; 62, second red LED; 7, connector. DETAILED DESCRIPTION
[0030] The utility model makes further description in combination with the following embodiments.
[0031] From Figure 1 It can be known that the power circuit of the air purifier comprises a first power input 11, a second power input 12, a PWM pulse width modulation module, a first power output module, a second power output module and a third power output module.
[0032] The first power input 11 and the second power input 12 are respectively connected with the input end of the PWM pulse width modulation module; and the first power output module, the second power output module and the third power output module are respectively connected with the output end of the PWM pulse width modulation module.
[0033] Specifically, the air purifier power supply circuit in the embodiment, when in use, by external connection of an external power supply between the first power input port 11 and the second power input port 12, the external power supply provides voltage to the first power output module, the second power output module and the third power output module in turn under the action of the PWM pulse width modulation module, so that the first power output module, the second power output module and the third power output module output power supply of different voltages respectively, which can supply power to other circuits of the air purifier; the first power output module, the second power output module and the third power output module are integrated together in the embodiment, without the need to set multiple voltage conversion circuits and voltage conversion chips, effectively saving the overall cost and overall space.
[0034] The air purifier power supply circuit in the embodiment, the PWM pulse width modulation module includes a PWM pulse width modulation chip U11 and a primary winding; the first power input port 11 and the second power input port 12 are provided with a resistor R1; one end of the primary winding is connected with the first power input port 11; the other end of the primary winding is connected with the output end of the PWM pulse width modulation chip U11; the power supply end of the PWM pulse width modulation chip U11 is connected with the second power input port 12; wherein the model of the PWM pulse width modulation chip U11 is LY9525, which has a switch tube integrated inside, which can control the on-off of the internal integrated switch tube by modulating the pulse width of PWM, so as to output voltage through the primary winding to the first power output module, the second power output module and the third power output module.
[0035] The air purifier power supply circuit in the embodiment, the first power output module includes a first rectifier filter module, a first positive power output port 21, a first negative power output port 22, a first main filter capacitor EC14 and a first secondary winding cooperating with the primary winding;
[0036] The first rectifier filter module includes a diode D13, a capacitor C12 and a resistor R11; wherein the diode D13 can rectify the secondary current; the capacitor C12 can perform first filtering processing on the secondary current to reduce ripple; the resistor R11 can suppress high-frequency oscillation and improve waveform quality; the first main filter capacitor EC14 can smooth the rectified direct current voltage and at the same time provide short-term energy storage function to cope with the instantaneous change of the output end load;
[0037] One end of the first secondary winding is connected with the first positive power output port 21 through the diode D13; the capacitor C12 and the resistor R11 are connected and arranged at both ends of the diode D13; the other end of the first secondary winding is connected with the first negative power output port 22; the first main filter capacitor EC14 is arranged between the first positive power output port 21 and the first negative power output port 22.
[0038] Specifically, the first auxiliary winding cooperates with the primary winding to generate a voltage in the first auxiliary winding, and the voltage is output between the first positive power output port 21 and the first negative power output port 22 after the first rectification and filtering module and the first main filter capacitor EC24.
[0039] The first power output module further comprises a resistor R15, a resistor R16, a triode Q11, and a first optocoupler transmitter U12A.
[0040] The PWM pulse width modulation module further comprises a first optocoupler receiver U12B cooperating with the first optocoupler transmitter U12A.
[0041] Specifically, when the load of the first power output module is short-circuited, the current sharply rises, so that the triode Q11 is turned on after passing through the resistor R15, the first optocoupler transmitter U12A is powered and emits light, the first optocoupler receiver U12B is turned on and grounded after receiving the signal, and the PWM pulse width modulation chip U11 senses it and controls the entire circuit to stop working.
[0042] The second power output module comprises a second rectification and filtering module, a second positive power output port 31, a second negative power output port 32, a second main filter capacitor EC24, and a second auxiliary winding cooperating with the primary winding.
[0043] The second rectification and filtering module comprises a diode D23, a capacitor C22, and a resistor R21.
[0044] One end of the second secondary winding is connected with the second positive power output 31 through diode D23; the capacitor C22 is connected with the resistor R21 and is arranged at both ends of the diode D23; the other end of the second secondary winding is connected with the second negative power output 32; the second main filter capacitor EC24 is arranged between the second positive power output 31 and the second negative power output 32.
[0045] Specifically, the second secondary winding cooperates with the primary winding to generate a voltage in the second secondary winding, and the voltage is output between the second positive power output 31 and the second negative power output 32 through the second rectifier filter module and the second main filter capacitor EC24; in addition, the output voltage can be changed by adjusting the number of turns of the second secondary winding.
[0046] The second power output module further comprises a resistor R25, a resistor R26, a triode Q21 and a second optocoupler transmitter U22A; one end of the resistor R25 is connected with the second positive power output 31; the other end of the resistor R25 is connected with the base of the triode Q21 through the resistor R26; the collector of the triode Q21 is grounded through the second optocoupler transmitter U22A; the emitter of the triode Q21 is connected with the base of the triode Q21 through the resistor R26; the emitter of the triode Q21 is externally connected with a power supply.
[0047] The PWM pulse width modulation module further comprises a second optocoupler receiver U22B cooperating with the second optocoupler transmitter U22A; the feedback end of the PWM pulse width modulation chip U11 is grounded through the second optocoupler receiver U22B.
[0048] Specifically, when the load of the second power output module is short-circuited, the current sharply rises, so that the triode Q21 is turned on through the resistor R25, the second optocoupler transmitter U22A is powered on and emits light, the second optocoupler receiver U22B is turned on and grounded after receiving the signal, and the PWM pulse width modulation chip U11 senses it and controls the entire circuit to stop working.
[0049] The third power output module comprises a third rectifier filter module, a third positive power output 41, a third negative power output 42, a third main filter capacitor EC34 and a third secondary winding cooperating with the primary winding.
[0050] The third rectification and filtering module comprises a diode D33, a capacitor C32 and a resistor R31; the diode D33 can rectify the secondary current; the capacitor C32 can perform first filtering processing on the secondary current to reduce ripples; the resistor R31 can suppress high-frequency oscillation and improve waveform quality; and the first main filter capacitor EC34 can smooth the rectified direct current voltage and simultaneously provide a short-time energy storage function to cope with instantaneous changes of the output terminal load.
[0051] One end of the third secondary winding is connected with the third positive power output port 41 through the diode D33; the capacitor C32 and the resistor R31 are connected and arranged at both ends of the diode D33; the other end of the third secondary winding is connected with the third negative power output port 42; and the third main filter capacitor EC34 is arranged between the third positive power output port 41 and the third negative power output port 42.
[0052] Specifically, the third secondary winding cooperates with the primary winding to generate a voltage in the third secondary winding, and the voltage is output between the third positive power output port 41 and the third negative power output port 42 after passing through the third rectification and filtering module and the third main filter capacitor EC34; in addition, the output voltage can be changed by adjusting the number of turns of the third secondary winding.
[0053] The third power output module further comprises a resistor R35, a resistor R36, a triode Q31 and a third optocoupler transmitter U32A; one end of the resistor R35 is connected with the third positive power output port 41; the other end of the resistor R35 is connected with the base of the triode Q31 through the resistor R36; the collector of the triode Q31 is grounded through the third optocoupler transmitter U32A; the emitter of the triode Q31 is connected with the base of the triode Q31 through the resistor R36; and the emitter of the triode Q31 is externally connected with a power supply.
[0054] The PWM pulse width modulation module further comprises a third optocoupler receiver U32B cooperating with the third optocoupler transmitter U32A; and the feedback end of the PWM pulse width modulation chip U11 is grounded through the third optocoupler receiver U32B.
[0055] Specifically, when the load of the third power output module is short-circuited, the current sharply rises, the triode Q31 is turned on through the resistor R35, the third optocoupler transmitter U32A is powered on and emits light, the third optocoupler receiver U32B is turned on and grounded after receiving the signal, and the PWM pulse width modulation chip U11 senses it and controls the entire circuit to stop working.
[0056] The third optocoupler receiver U32B, the second optocoupler receiver U22B and the first optocoupler receiver U12B are connected in parallel with each other, so that when a short circuit occurs in one of the power output modules, the PWM pulse width modulation chip U11 controls the entire circuit to stop working, thereby effectively protecting the power circuit.
[0057] The power supply circuit of the air purifier also comprises an RCD absorption module, which comprises a diode D1, a resistor R3 and a capacitor C1. The positive electrode of the diode D1 is connected with the other end of the primary winding. The negative electrode of the diode D1 is connected with one end of the primary winding through the resistor R3 and the capacitor C1 in sequence. The above arrangement can absorb the high-voltage spike generated by the primary winding during the switching process, thereby protecting the PWM pulse width modulation chip U11 and the internal switch tube from the damage of the high-voltage spike and improving the reliability of the power supply.
[0058] It should be finally pointed out that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit the protection scope of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the essence and scope of the technical solutions of the present application.
Claims
1. A power supply circuit for an air purifier, characterized in that: The first power input port, the second power input port, the PWM pulse width modulation module, the first power output module, the second power output module and the third power output module are included. The first power input port and the second power input port are connected with the input end of the PWM pulse width modulation module respectively.
2. The power supply circuit of an air cleaner according to claim 1, wherein: The PWM pulse width modulation module includes a PWM pulse width modulation chip U11 and a primary winding.
3. The power supply circuit of an air cleaner according to claim 2, wherein: The first power output module includes a first rectification and filtering module, a first positive power output port, a first negative power output port, a first main filter capacitor EC14 and a first secondary winding matched with the primary winding. The first rectification and filtering module includes a diode D13, a capacitor C12 and a resistor R11. One end of the first secondary winding is connected with the first positive power output port through the diode D13.
4. The power supply circuit of an air cleaner according to claim 3, wherein: The first power output module further includes a resistor R15, a resistor R16, a triode Q11 and a first optical coupler transmitter U12A. The PWM pulse width modulation module further includes a first optical coupler receiver U12B matched with the first optical coupler transmitter U12A.
5. The power supply circuit of an air cleaner according to claim 2, wherein: The second power output module includes a second rectification and filtering module, a second positive power output port, a second negative power output port, a second main filter capacitor EC24 and a second secondary winding matched with the primary winding. The second rectification and filtering module includes a diode D23, a capacitor C22 and a resistor R21. One end of the second secondary winding is connected with the second positive power output port through the diode D23. The second main filter capacitor EC24 is arranged between the second positive power output port and the second negative power output port.
6. The power supply circuit of an air cleaner according to claim 5, wherein: The second power output module further comprises a resistor R25, a resistor R26, a triode Q21 and a second optical coupler transmitter U22A; one end of the resistor R25 is connected with the second positive power output port; the other end of the resistor R25 is connected with the base of the triode Q21 through the resistor R26; the collector of the triode Q21 is grounded through the second optical coupler transmitter U22A; the emitter of the triode Q21 is connected with the base of the triode Q21 through the resistor R26; and the emitter of the triode Q21 is connected with the power supply externally. The PWM pulse width modulation module further comprises a second optical coupler receiver U22B matched with the second optical coupler transmitter U22A; and the feedback end of the PWM pulse width modulation chip U11 is grounded through the second optical coupler receiver U22B.
7. The power supply circuit of an air cleaner according to claim 2, wherein: The third power output module comprises a third rectification and filtering module, a third positive power output port, a third negative power output port, a third main filtering capacitor EC34 and a third secondary winding matched with the primary winding; The third rectification and filtering module comprises a diode D33, a capacitor C32 and a resistor R31; One end of the third secondary winding is connected with the third positive power output port through the diode D33; the capacitor C32 and the resistor R31 are connected and arranged between the two ends of the diode D33; the other end of the third secondary winding is connected with the third negative power output port; and the third main filtering capacitor EC34 is arranged between the third positive power output port and the third negative power output port.
8. The power supply circuit of an air cleaner according to claim 7, wherein: The third power output module further comprises a resistor R35, a resistor R36, a triode Q31 and a third optical coupler transmitter U32A; one end of the resistor R35 is connected with the third positive power output port; the other end of the resistor R35 is connected with the base of the triode Q31 through the resistor R36; the collector of the triode Q31 is grounded through the third optical coupler transmitter U32A; the emitter of the triode Q31 is connected with the base of the triode Q31 through the resistor R36; and the emitter of the triode Q31 is connected with the power supply externally. The PWM pulse width modulation module further comprises a third optical coupler receiver U32B matched with the third optical coupler transmitter U32A; and the feedback end of the PWM pulse width modulation chip U11 is grounded through the third optical coupler receiver U32B.
9. The power supply circuit of an air cleaner according to claim 2, wherein: The RCD absorption module further comprises a diode D1, a resistor R3 and a capacitor C1; the anode of the diode D1 is connected with the other end of the primary winding; the cathode of the diode D1 is connected with one end of the primary winding through the resistor R3 and the capacitor C1 in sequence.