Medium-voltage direct-current atomizer driving circuit and atomizer

Abstract

The utility model provides a medium-voltage direct-current atomizer driving circuit and an atomizer. The medium-voltage direct-current atomizer driving circuit comprises a switching power supply module, a voltage reduction and stabilization module, a control part module, an electronic switch and an atomization generator, the input end of the switching power supply module is connected with alternating-current mains supply, and the output end of the switching power supply module outputs 110V direct-current voltage to the electronic switch and 12V direct-current voltage to the voltage reduction and stabilization module; the voltage reducing and stabilizing module reduces 12V direct-current voltage to 5V and then supplies power to the control part module, and the signal output end of the control part module is connected to the electronic switch to drive the electronic switch to be switched on so that the 110V direct-current voltage can be output to the atomization generator. According to the medium-voltage direct-current atomizer driving circuit, the requirement for device performance is relatively low, the corresponding EMC and energy efficiency problems caused by multiple times of power conversion are avoided, and the product design, debugging and production cost is reduced.

Description

Technical Field

[0001] This utility model relates to a household product, and more particularly to an atomizer. Background Technology

[0002] Traditional medium-voltage DC atomizer drive circuits, such as Figure 1 As shown, the input is 90-264VAC, which, after conversion by a switching power supply, outputs a high-current, low-voltage +24V DC voltage, roughly divided into three paths: one path is stepped down and regulated to +5V for the control section; another path is boosted to a medium-voltage 110V by the atomizer driver via inductor L for the atomizer generator; and the third path supplies other components. The existing solutions mainly have two problems:

[0003] The key challenges of stepping down the input voltage from 1.90 to 264VAC to +24V are twofold: one is the low voltage and high current, which places high demands on the performance of rectifier and filter components, resulting in higher component costs; the other is the EMC and energy efficiency of the switching power supply.

[0004] 2. The key challenge of boosting +24V to 110V lies in the low voltage and high current, which places high demands on the performance of the conversion devices, resulting in higher device costs. Furthermore, it requires high-power energy storage devices such as inductors, which increases costs. The boosting of the secondary conversion also leads to EMC issues and further reduces energy efficiency. Utility Model Content

[0005] The main technical problem to be solved by this utility model is to provide a medium-voltage DC atomizer drive circuit with relatively low requirements for device performance, avoiding the corresponding EMC and energy efficiency problems caused by multiple power supply changes, and reducing product design, debugging and production costs.

[0006] To solve the above-mentioned technical problems, this utility model provides a medium-voltage DC atomizer drive circuit, including: a switching power supply module, a step-down voltage regulator module, a control module, an electronic switch, and an atomizer generator;

[0007] The input terminal of the switching power supply module is connected to AC mains power, and the output terminal outputs 110V DC voltage to the electronic switch and 12V DC voltage to the buck regulator module. The buck regulator module steps down the 12V DC voltage to 5V to power the control module. The signal output terminal of the control module is connected to the electronic switch to drive the electronic switch to conduct, so that the 110V DC voltage is output to the atomizer.

[0008] In a preferred embodiment: the AC mains power is connected to the rectifier bridge DB101 via the fuse FU1 of the switching power supply module; the DC output terminal of the rectifier bridge DB101 is filtered by a PI-type filter composed of capacitors C101 and C102 and inductor L101 to generate a DC voltage of 127-370Vdc, which is then supplied to the chip IC101 via resistors R101 and R102.

[0009] In a preferred embodiment: when the internal MOS of chip IC101 is turned on, the current flows through the primary winding of the transformer, the input of pins 5, 6, 7, and 8 of chip IC101, the output of pin 4 of chip IC101, and resistors R108 and R109 to form a primary circuit. At this time, the induced electromotive force of each winding of the transformer is positive.

[0010] In a preferred embodiment: When the internal MOS of chip IC101 is turned off:

[0011] A 3-1 reverse induced electromotive force is generated on the primary winding of the transformer. The drain of the MOS transistor inside the IC101 chip will generate a reverse spike voltage, which is released through the primary buffer absorption circuit. The primary buffer absorption circuit includes resistors R103, R104, R105, R106, capacitor C105, and Schottky diode D102.

[0012] A reverse induced electromotive force is generated on the secondary winding of the transformer. At this time, the secondary Schottky diodes D201 and D202 are forward biased and in the conducting state. The current charges through capacitors C201, C202, C203, C206, C207, and C208, and then through the load to form a loop to the output ground.

[0013] A reverse induced electromotive force is generated on the auxiliary winding of the transformer, and the Schottky diode D101 is forward-biased. This charges the starting capacitor C111 and supplies power to the IC101 chip.

[0014] In a preferred embodiment: the +110V and +12V output voltages of the switching power supply module are determined by the transformer turns ratio, optocoupler IC103, and TL431;

[0015] When Schottky diodes D201 and D202 are forward biased and in the conducting state, the Vo output voltage increases → the TL431 reference voltage increases → the TL431 cathode and anode voltage drop decreases and the current increases → the primary current of optocoupler IC103 increases → the secondary current of optocoupler IC103 increases → the voltage at pin FB of chip IC101 increases → chip IC101 reduces the duty cycle of its internal MOSFET → the Vo output voltage decreases.

[0016] This invention also provides a humidifier that uses the driving circuit described above.

[0017] Compared with the prior art, the technical solution of this utility model has the following beneficial effects:

[0018] This invention provides a medium-voltage DC atomizer drive circuit and a humidifier, which has relatively low requirements for device performance, avoids the corresponding EMC and energy efficiency problems caused by multiple power supply changes, and reduces product design, debugging and production costs. Attached Figure Description

[0019] Figure 1 This is a circuit diagram of an atomizer drive circuit in the prior art;

[0020] Figure 2 This is a circuit diagram of the atomizer drive circuit in a preferred embodiment of the present invention;

[0021] Figure 3 This is a circuit diagram of the switching power supply module in a preferred embodiment of the present invention. Detailed Implementation

[0022] To make the technical solution and features of this utility model clearer, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific examples. It should be understood that these examples are only for illustrating this utility model and are not intended to limit the scope of this utility model. After reading this utility model, any modifications of this utility model by those skilled in the art in various equivalent forms fall within the scope defined by the appended claims.

[0023] refer to Figures 1-3 This embodiment provides a medium-voltage DC atomizer drive circuit, including: a switching power supply module, a step-down voltage regulator module, a control module, an electronic switch, and an atomizer generator;

[0024] The input terminal of the switching power supply module is connected to AC mains power, and the output terminal outputs 110V DC voltage to the electronic switch and 12V DC voltage to the buck regulator module. The buck regulator module steps down the 12V DC voltage to 5V to power the control module. The signal output terminal of the control module is connected to the electronic switch to drive the electronic switch to conduct, so that the 110V DC voltage is output to the atomizer.

[0025] The circuit diagram of the switching power supply module in this embodiment is as follows: Figure 3As shown, this embodiment does not describe the circuit connections in detail, but only the circuit principle: The AC mains power flows through the fuse FU1 of the switching power supply module to the rectifier bridge DB101; the DC output terminal of the rectifier bridge DB101 is filtered by a PI-type filter composed of capacitors C101 and C102 and inductor L101 to generate a DC voltage of 127-370Vdc, which is then supplied to the chip IC101 via resistors R101 and R102. When the internal MOS of the chip IC101 is turned on, the current flows through the primary winding of the transformer, the input of pins 5, 6, 7, and 8 of the chip IC101, the output of pin 4 of the chip IC101, and resistors R108 and R109 to form a primary circuit. At this time, the induced electromotive force of each winding of the transformer is positive.

[0026] When the internal MOS of chip IC101 is turned off:

[0027] A 3-1 reverse induced electromotive force is generated on the primary winding of the transformer. The drain of the MOS transistor inside the IC101 chip will generate a reverse spike voltage, which is released through the primary buffer absorption circuit. The primary buffer absorption circuit includes resistors R103, R104, R105, R106, capacitor C105, and Schottky diode D102.

[0028] A reverse induced electromotive force is generated on the secondary winding of the transformer. At this time, the secondary Schottky diodes D201 and D202 are forward biased and in the conducting state. The current charges through capacitors C201, C202, C203, C206, C207, and C208, and then through the load to form a loop to the output ground.

[0029] A reverse induced electromotive force is generated on the auxiliary winding of the transformer, and the Schottky diode D101 is forward-biased. This charges the starting capacitor C111 and supplies power to the IC101 chip.

[0030] The +110V and +12V output voltages of the switching power supply module are determined by the transformer turns ratio, optocoupler IC103, and TL431. When Schottky diodes D201 and D202 are forward biased and in the conducting state, the Vo output voltage increases → the TL431 reference voltage increases → the TL431 cathode and anode voltage drop decreases and the current increases → the primary current of optocoupler IC103 increases → the secondary current of optocoupler IC103 increases → the voltage at pin FB of chip IC101 increases → chip IC101 reduces the duty cycle of its internal MOSFET → the Vo output voltage decreases.

[0031] The above is only one specific embodiment of the present utility model, but the design concept of the present utility model is not limited thereto. Any non-substantial modifications made to the present utility model using this concept shall be deemed as an infringement of the protection scope of the present utility model.

Claims

1. A medium voltage DC atomizer drive circuit, characterized by It comprises: A switching power module, a voltage reduction and stabilization module, a control part module, an electronic switch and an atomization generator; The input end of the switching power module is connected to an AC mains power supply, and the output end outputs 110V DC voltage to the electronic switch and 12V DC voltage to the voltage reduction and stabilization module; the voltage reduction and stabilization module reduces the 12V DC voltage to 5V and supplies power to the control part module, and the signal output end of the control part module is connected to the electronic switch to drive the electronic switch to be conductive, so that the 110V DC voltage is output to the atomization generator.

2. A medium voltage DC atomizer drive circuit according to claim 1, characterized in that: The AC mains power supply is connected to the fuse FU1 of the switching power module and then to the rectifier bridge DB101; the DC output end of the rectifier bridge DB101 passes through the PI type filter composed of the capacitors C101 and C102 and the inductor L101 to generate a DC voltage of 127-370Vdc, and the voltage is provided to the chip IC101 through the resistors R101 and R102.

3. A medium voltage DC atomizer drive circuit according to claim 2, characterized in that: When the MOS inside the chip IC101 is conductive, the current passes through the primary winding of the transformer, the pins 5, 6, 7 and 8 of the chip IC101, the pin 4 of the chip IC101, the resistors R108 and R109 to form a primary loop, at this time, the induced electromotive force of each winding of the transformer is positive.

4. The medium voltage DC atomizer drive circuit of claim 2, wherein: When the MOS inside the chip IC101 is off: A 3-1 reverse induced electromotive force is generated on the primary winding of the transformer, a reverse sharp voltage is generated at the D pole of the MOS inside the chip IC101, and the primary buffer absorption loop is used for release; the primary buffer absorption loop comprises the resistors R103, R104, R105, R106, the capacitor C105 and the Schottky diode D102; A reverse induced electromotive force is generated on the secondary winding of the transformer, at this time, the Schottky diodes D201 and D202 are forward biased and in a conductive state; the current charges through the capacitors C201, C202, C203, C206, C207 and C208, and then forms a loop through the load to the output ground; A reverse induced electromotive force is generated on the auxiliary winding of the transformer, and the Schottky diode D101 is forward biased and conductive to charge the starting capacitor C111 and supply power to the chip IC101.

5. A medium voltage DC atomizer drive circuit according to claim 4, characterized in that: The +110V and +12V voltages output by the switching power module are determined by the turns ratio of the transformer, the optocoupler IC103 and the TL431; When the Schottky diodes D201 and D202 are forward biased and in a conductive state, the Vo output voltage increases → the reference electrode voltage of the TL431 increases → the pressure drop between the cathode and the anode of the TL431 decreases, the current increases → the primary current of the optocoupler IC103 increases → the secondary current of the optocoupler IC103 increases → the FB pin voltage of the chip IC101 rises → the duty cycle of the MOS inside the chip IC101 decreases → the Vo output voltage decreases.

6. An atomiser characterised in that The driving circuit of any one of claims 1-5 is used.

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