A built-in water purifier waterproof power adapter with humidity protection function

Abstract

The present invention relates to the technical field of power adapters, and in particular to a built-in waterproof power adapter for a water purifier with a humidity protection function, comprising a cover body, a wire and a PCB board arranged in the cover body; the wire is connected to the PCB board after being extended into the cover body; a humidity protection circuit is arranged on the PCB board; the humidity protection circuit comprises an input module, an output module, a PWM control module, a humidity module and a switch module; by setting a humidity protection circuit, when the cover body is damaged and damp and water enters, the humidity module transmits a humidity signal to the PWM control module, thereby changing the pulse width of the PWM signal sent to the switch module, so that the adapter is in a hiccup mode, thereby making the adapter work in a protection state.

Description

Technical Field

[0001] The present invention relates to the technical field of power adapters, and in particular to a built-in water purifier waterproof power adapter with a humidity protection function. Background Art

[0002] The power adapter is a power changing device that people need to use in their daily work and life. It can convert the input AC power into DC power supply of different specifications. For example, the water purifier we use comes with a power adapter.

[0003] In order to save space, a power adapter built into the water purifier has appeared on the market. However, since the power adapter is built into the water purifier, when the water purifier fails, the power adapter is easily exposed to water. Therefore, there is an urgent need for a power adapter that can prevent damage when water enters. Summary of the invention

[0004] The purpose of the present invention is to provide a built-in water purifier waterproof power adapter with humidity protection function in view of the above-mentioned deficiencies in the prior art.

[0005] The purpose of the present invention is achieved through the following technical solutions: A built-in water purifier waterproof power adapter with humidity protection function, comprising a cover, a wire and a PCB board arranged in the cover; the wire is connected to the PCB board after extending into the cover; the PCB board is provided with a humidity protection circuit;

[0006] The humidity protection circuit includes an input module, an output module, a PWM control module, a humidity module and a switch module;

[0007] The input module is connected to the output module via a switch module;

[0008] The humidity module is used to sense the humidity inside the cover and send a humidity signal to the PWM control module;

[0009] The PWM control module is used to receive the humidity signal and send a PWM signal to the switch module according to the humidity signal;

[0010] The switch module is used to receive a PWM signal and connect or disconnect the switch module and the output module according to the PWM signal.

[0011] The present invention is further configured as follows: the input module includes a fuse F1, a varistor MOV1, a thermistor NTC1, a resistor R1, a resistor R2, a common-mode inductor LF1, an inductor CX1, and a bridge circuit BD1; one end of the fuse F1 is connected to the mains; the other end of the fuse F1 is grounded through the varistor MOV1; the other end of the fuse F1 is connected to one end of the thermistor NTC1; the other end of the thermistor NTC1 is grounded through the inductor CX1; the branch composed of the resistor R1 and the resistor R2 is connected in parallel with the inductor CX1; the other end of the thermistor NTC1 is connected to one end of the common-mode inductor LF1; the other end of the common-mode inductor LF1 is connected to the input end of the bridge circuit BD1; and the output end of the bridge circuit BD1 is connected to the switch module.

[0012] The present invention is further configured as follows: the switch module includes a resistor R5, a diode D5, a MOS tube Q1 and a transformer T1; one end of the resistor R5 is connected to the input module; the other end of the resistor R5 is connected to the cathode of the diode D5; the anode of the diode D5 is connected to the drain of the MOS tube Q1; the gate of the MOS tube Q1 is connected to the output end of the PWM control module; the source of the MOS tube Q1 is grounded; the two ends of the primary side of the transformer T1 are respectively connected to one end of the resistor R5 and the drain of the MOS tube Q1; and the secondary side of the transformer T1 is connected to the output module.

[0013] The present invention is further configured as follows: the humidity module includes a humidity-sensitive resistor RH1, a diode D7, a resistor R35A, a voltage-stabilizer ZD1, a resistor R33A and a resistor R34A; the positive electrode of the voltage-stabilizer ZD1 is grounded; the negative electrode of the voltage-stabilizer ZD1 is connected to one end of the resistor R35A; the other end of the resistor R35A is connected to the negative electrode of the diode D7; the positive electrode of the diode D7 is grounded; the negative electrode of the voltage-stabilizer ZD1 is connected to one end of the resistor R33A; the other end of the resistor R33A is connected to one end of the humidity-sensitive resistor RH1; the other end of the humidity-sensitive resistor RH1 is grounded through the resistor R34A; the other end of the humidity-sensitive resistor RH1 is connected to the input end of the PWM control module.

[0014] The present invention is further configured such that a waterproof wire clip is provided between the wire and the cover; the waterproof wire clip is integrally formed with the wire;

[0015] The cover body comprises an upper cover and a lower cover; the upper cover is provided with a first connecting block; the lower cover is provided with a second connecting block; the waterproof line clamp is provided with a first clamping block; the first connecting block is provided with a first clamping slot matched with the first clamping block; the second connecting block is provided with a second clamping slot matched with the first clamping block;

[0016] A first convex ridge is provided in the second card slot;

[0017] The lower cover is provided with grooves around its periphery; a waterproof ring is provided on the groove; and the first clamping block is clamped with the first clamping groove via the waterproof ring.

[0018] The present invention is further configured such that the waterproof line clamp is provided with a second clamping block; the first connecting block is provided with a third clamping slot cooperating with the second clamping block; the second connecting block is provided with a fourth clamping slot cooperating with the second clamping block; and a second convex ridge is provided between the first clamping slot and the third clamping slot.

[0019] The present invention is further configured such that the upper cover is detachably connected to the lower cover.

[0020] The present invention is further configured such that the waterproof wire clip is provided with an anti-folding groove.

[0021] The present invention is further configured such that a support plate is provided between the upper cover and the lower cover; and the cross-sectional shape of the support plate is L-shaped.

[0022] The present invention is further configured such that both ends of the upper cover are provided with hanging ears.

[0023] Beneficial effects of the present invention: The present invention sets a humidity protection circuit. When the cover is damaged and damp, the humidity module transmits the humidity signal to the PWM control module, thereby changing the pulse width of the PWM signal sent to the switch module, so that the adapter is in hiccup mode, thereby making the adapter work in a protection state. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The invention is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the invention. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0025] Figure 1 It is a schematic diagram of the structure of the present invention;

[0026] Figure 2 is a structural exploded view of the present invention;

[0027] Figure 3 It is a schematic diagram of the structure of the wire material and the waterproof wire clip of the present invention;

[0028] Figure 4 It is a structural schematic diagram of the lower cover of the present invention;

[0029] Figure 5 yes Figure 4 A partial enlarged view of the A part;

[0030] Figure 6 It is a structural schematic diagram of the upper cover of the present invention;

[0031] Figure 7 yes Figure 6 A partial enlarged view of the B area;

[0032] Figure 8 is a circuit diagram of a humidity protection circuit of the present invention;

[0033] Among them: 11-wire; 12-PCB board; 2-waterproof wire card; 21-first card block; 22-second card block; 23-anti-folding groove; 3-upper cover; 31-first connecting block; 4-lower cover; 41-second connecting block; 42-groove; 43-waterproof ring; 51-first card slot; 52-second card slot; 53-third card slot; 54-fourth card slot; 61-first convex rib; 62-second convex rib; 7-support plate; 8-hanging ear. DETAILED DESCRIPTION

[0034] The present invention is further described in conjunction with the following examples.

[0035] Depend on Figures 1 to 8 It can be seen that the built-in water purifier waterproof power adapter with humidity protection function described in this embodiment includes a cover body, a wire 11 and a PCB board 12 arranged in the cover body; the wire 11 is connected to the PCB board 12 after extending into the cover body; the PCB board 12 is provided with a humidity protection circuit;

[0036] The humidity protection circuit includes an input module, an output module, a PWM control module, a humidity module and a switch module;

[0037] The input module is connected to the output module via a switch module;

[0038] The humidity module is used to sense the humidity inside the cover and send a humidity signal to the PWM control module;

[0039] The PWM control module is used to receive the humidity signal and send a PWM signal to the switch module according to the humidity signal; wherein the model of the PWM control module is RT7738;

[0040] The switch module is used to receive a PWM signal and connect or disconnect the switch module and the output module according to the PWM signal.

[0041] Specifically, the built-in water purifier waterproof power adapter with humidity protection function described in this embodiment is provided with a humidity protection circuit. When the cover is damaged and water-intake is affected by moisture, and the humidity reaches a state where the power supply has leakage, short circuit and discharge, the built-in humidity module transmits the humidity signal to the PWM control module as the humidity increases. The PWM control module changes the pulse width of the PWM signal sent to the switch module according to the humidity signal, so that the adapter is in hiccup mode, thereby making the adapter work in a protection state, and will not cause the adapter to be in a high humidity and water-intake environment. High humidity may cause circuit short circuit, fire and explosion, causing parts to burn and thus causing line short circuit.

[0042] The present embodiment describes a built-in waterproof power adapter for a water purifier with a humidity protection function, wherein the input module includes a fuse F1, a varistor MOV1, a thermistor NTC1, a resistor R1, a resistor R2, a common-mode inductor LF1, an inductor CX1, and a bridge circuit BD1; one end of the fuse F1 is connected to the mains; the other end of the fuse F1 is grounded through the varistor MOV1; the other end of the fuse F1 is connected to one end of the thermistor NTC1; the other end of the thermistor NTC1 is grounded through the inductor CX1; the branch formed by the resistor R1 and the resistor R2 is connected in parallel with the inductor CX1; the other end of the thermistor NTC1 is connected to one end of the common-mode inductor LF1; the other end of the common-mode inductor LF1 is connected to the input end of the bridge circuit BD1; the output end of the bridge circuit BD1 is connected to the switch module. Specifically, this embodiment forms an EMI rectification and filtering circuit through the above-mentioned components, which can effectively prevent overcurrent or short circuit protection and better filter EMI conduction interference; among them, the thermistor NTC1 limits the startup surge current; the varistor MOV1 limits the input voltage to be too high.

[0043] The present embodiment describes a built-in water purifier waterproof power adapter with humidity protection function, wherein the switch module includes a resistor R5, a diode D5, a MOS tube Q1 and a transformer T1; one end of the resistor R5 is connected to the input module; the other end of the resistor R5 is connected to the cathode of the diode D5; the anode of the diode D5 is connected to the drain of the MOS tube Q1; the gate of the MOS tube Q1 is connected to the output end of the PWM control module; the source of the MOS tube Q1 is grounded; the two ends of the primary side of the transformer T1 are respectively connected to one end of the resistor R5 and the drain of the MOS tube Q1; and the secondary side of the transformer T1 is connected to the output module.

[0044] Specifically, when the humidity in the cover is too high, the PWM control module outputs a low pulse width PWM signal to the MOS tube Q1, so that the gate of the MOS tube Q1 is at a low level most of the time. When the gate of the MOS tube Q1 is at a low level, the MOS tube is in a disconnected state, and the primary side of the transformer T1 loses voltage, so that the output module cannot output voltage. Therefore, the adapter is in hiccup mode, so that the adapter works in a protection state.

[0045] The present embodiment describes a built-in waterproof power adapter for a water purifier with a humidity protection function, wherein the humidity module includes a humidity-sensitive resistor RH1, a diode D7, a resistor R35A, a voltage-stabilizing tube ZD1, a resistor R33A and a resistor R34A; the positive electrode of the voltage-stabilizing tube ZD1 is grounded; the negative electrode of the voltage-stabilizing tube ZD1 is connected to one end of the resistor R35A; the other end of the resistor R35A is connected to the negative electrode of the diode D7; the positive electrode of the diode D7 is grounded; the negative electrode of the voltage-stabilizing tube ZD1 is connected to one end of the resistor R33A; the other end of the resistor R33A is connected to one end of the humidity-sensitive resistor RH1; the other end of the humidity-sensitive resistor RH1 is grounded through the resistor R34A; the other end of the humidity-sensitive resistor RH1 is connected to the input end of the PWM control module.

[0046] The resistance value of the humidity-sensitive resistor RH1 is 31K under normal conditions. When the cover is leaking or soaked, the resistance value of the humidity-sensitive resistor RH1 will gradually decrease with the increase of water volume and humidity. The current in the branch composed of resistor R33A, humidity-sensitive resistor RH1, and resistor R34A will slowly increase, and the voltage drop generated by resistor R34A will slowly increase. When the voltage of resistor R34A reaches 0.45V, the comparator circuit inside the 4th pin of the PWM control module starts to operate and output a PWM signal. When the circuit is in protection, the main PWM pulse width is very small, and the circuit output is in hiccup mode, thereby protecting the adapter.

[0047] In addition, in order to enhance the waterproof performance of the adapter, the waterproof power adapter for a built-in water purifier with a humidity protection function described in this embodiment has a waterproof wire clip 2 between the wire 11 and the cover body; the waterproof wire clip 2 is integrally formed with the wire 11;

[0048] The cover body includes an upper cover 3 and a lower cover 4; the upper cover 3 is provided with a first connecting block 31; the lower cover 4 is provided with a second connecting block 41; the waterproof wire clamp 2 is provided with a first clamping block 21; the first connecting block 31 is provided with a first clamping groove 51 matched with the first clamping block 21; the second connecting block 41 is provided with a second clamping groove 52 matched with the first clamping block 21;

[0049] A first convex ridge 61 is provided in the second card slot 52;

[0050] The lower cover 4 is provided with grooves 42 around its periphery; a waterproof ring 43 is provided on the groove 42 ; and the first clamping block 21 is clamped with the first clamping groove 51 via the waterproof ring 43 .

[0051] Specifically, the power adapter described in this embodiment can seal the gap between the wire 11 and the cover body by setting the first card block 21 on the waterproof wire card 2 so that the first card block 21 is clamped between the first card slot 51 and the second card slot 52. In addition, by setting the first convex rib 61 in the second card slot 52, the first convex rib 61 can be an elastic member. By setting the first convex rib 61, the pressure between the second connecting block 41 and the waterproof wire card 2 can be increased, ensuring that the waterproof wire card 2 can be firmly fixed on the cover body and can play a very sealing role; in addition, by setting the waterproof ring 43, water can be prevented from flowing into the gap between the upper cover 3 and the lower cover 4, and by setting the waterproof ring 43 between the first card block 21 and the first card slot 51, the sealing and waterproof properties of the waterproof wire card 2 and the cover body can be further enhanced.

[0052] The present embodiment describes a built-in water purifier waterproof power adapter with humidity protection function, wherein the waterproof line card 2 is provided with a second card block 22; the first connecting block 31 is provided with a third card slot 53 cooperating with the second card block 22; the second connecting block 41 is provided with a fourth card slot 54 cooperating with the second card block 22; a second convex ridge 62 is provided between the first card slot 51 and the third card slot 53.

[0053] Specifically, the power adapter described in this embodiment can further fix the waterproof wire card 2 on the cover body by providing the second card block 22, the third card slot 53 and the fourth card slot 54. At the same time, by providing the second convex ridge 62, the pressure between the first connecting block 31 and the waterproof wire card 2 can be increased, ensuring that the waterproof wire card 2 can be firmly fixed on the cover body and can play a very sealing role.

[0054] In the waterproof power adapter for a built-in water purifier with humidity protection function described in this embodiment, the upper cover 3 is detachably connected to the lower cover 4. The above arrangement facilitates the user to disassemble and assemble the cover.

[0055] In the waterproof power adapter for a built-in water purifier with a humidity protection function described in this embodiment, the waterproof wire clip 2 is provided with an anti-bending groove 23. The anti-bending function of the waterproof wire clip 2 can be enhanced by providing the anti-bending groove 23.

[0056] In the waterproof power adapter for a built-in water purifier with a humidity protection function described in this embodiment, a support plate 7 is provided between the upper cover 3 and the lower cover 4. The support plate 7 can strengthen the stability between the upper cover 3 and the lower cover 4.

[0057] In the waterproof power adapter for a built-in water purifier with humidity protection function described in this embodiment, the cross-sectional shape of the support plate 7 is L-shaped. The above arrangement can further strengthen the stability between the upper cover 3 and the lower cover 4.

[0058] In the waterproof power adapter for a built-in water purifier with humidity protection function described in this embodiment, both ends of the upper cover 3 are provided with hanging ears 8. The hanging ears 8 are provided to facilitate the user to connect the power adapter to the inside of the water purifier.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A built-in water purifier waterproof power adapter with humidity protection function, characterized in that: It comprises a cover body, a wire (11) and a PCB board (12) arranged in the cover body; the wire (11) is connected to the PCB board (12) after extending into the cover body; and a humidity protection circuit is arranged on the PCB board (12); The humidity protection circuit includes an input module, an output module, a PWM control module, a humidity module and a switch module; The input module is connected to the output module via a switch module; The humidity module is used to sense the humidity inside the cover and send a humidity signal to the PWM control module; The PWM control module is used to receive the humidity signal and send a PWM signal to the switch module according to the humidity signal; The switch module is used to receive a PWM signal and connect or disconnect the switch module and the output module according to the PWM signal; When the cover is damaged and damp, and the humidity reaches the state where the power supply has leakage, short circuit and discharge, the built-in humidity module transmits the humidity signal to the PWM control module as the humidity increases. The PWM control module changes the pulse width of the PWM signal sent to the switch module according to the humidity signal. The input module includes a fuse F1, a varistor MOV1, a thermistor NTC1, a resistor R1, a resistor R2, a common mode inductor LF1, an inductor CX1, and a bridge circuit BD1; one end of the fuse F1 is connected to the mains; the other end of the fuse F1 is grounded through the varistor MOV1; the other end of the fuse F1 is connected to one end of the thermistor NTC1; the other end of the thermistor NTC1 is grounded through the inductor CX1; the branch formed by the resistor R1 and the resistor R2 is connected in parallel with the inductor CX1; the other end of the thermistor NTC1 is connected to one end of the common mode inductor LF1; the other end of the common mode inductor LF1 is connected to the input end of the bridge circuit BD1; the output end of the bridge circuit BD1 is connected to the switch module; the thermistor NTC1 limits the startup surge current; the varistor MOV1 limits the input voltage from being too high; The switch module includes a resistor R5, a diode D5, a MOS tube Q1 and a transformer T1; one end of the resistor R5 is connected to the input module; the other end of the resistor R5 is connected to the cathode of the diode D5; the anode of the diode D5 is connected to the drain of the MOS tube Q1; the gate of the MOS tube Q1 is connected to the output end of the PWM control module; the source of the MOS tube Q1 is grounded; the two ends of the primary side of the transformer T1 are respectively connected to one end of the resistor R5 and the drain of the MOS tube Q1; the secondary side of the transformer T1 is connected to the output module; When the humidity inside the cover is too high, the PWM control module outputs a low-pulse-width PWM signal to the MOS tube Q1, so that the gate of the MOS tube Q1 is at a low level most of the time. When the gate of the MOS tube Q1 is at a low level, the MOS tube is in a disconnected state, and the primary side of the transformer T1 loses voltage, so that the output module cannot output voltage. The humidity module includes a humidity-sensitive resistor RH1, a diode D7, a resistor R35A, a voltage-stabilizing tube ZD1, a resistor R33A and a resistor R34A; the positive electrode of the voltage-stabilizing tube ZD1 is grounded; the negative electrode of the voltage-stabilizing tube ZD1 is connected to one end of the resistor R35A; the other end of the resistor R35A is connected to the negative electrode of the diode D7; the positive electrode of the diode D7 is grounded; the negative electrode of the voltage-stabilizing tube ZD1 is connected to one end of the resistor R33A; the other end of the resistor R33A is connected to one end of the humidity-sensitive resistor RH1; the other end of the humidity-sensitive resistor RH1 is grounded through the resistor R34A; the other end of the humidity-sensitive resistor RH1 is connected to the input end of the PWM control module; The resistance value of the humidity-sensitive resistor RH1 is 31K in a normal state. When the cover is leaking or soaked, the resistance value of the humidity-sensitive resistor RH1 will gradually decrease with the increase of water volume and humidity. The current of the branch composed of resistor R33A, humidity-sensitive resistor RH1, and resistor R34A will slowly increase, and the voltage drop generated by resistor R34A will slowly increase. When the voltage of resistor R34A reaches 0.45V, the comparator circuit inside the 4th pin of the PWM control module starts to work and output a PWM signal. When the circuit is in protection, the main PWM pulse width is very small, and the circuit output is in hiccup mode, thereby protecting the adapter; A waterproof wire clip (2) is provided between the wire (11) and the cover body; the waterproof wire clip (2) and the wire (11) are integrally formed; The cover body comprises an upper cover (3) and a lower cover (4); the upper cover (3) is provided with a first connecting block (31); the lower cover (4) is provided with a second connecting block (41); the waterproof wire clamp (2) is provided with a first clamping block (21); the first connecting block (31) is provided with a first clamping slot (51) matched with the first clamping block (21); the second connecting block (41) is provided with a second clamping slot (52) matched with the first clamping block (21); A first convex ridge (61) is provided in the second card slot (52); The lower cover (4) is provided with grooves (42) around its periphery; a waterproof ring (43) is provided on the groove (42); the first clamping block (21) is clamped with the first clamping groove (51) via the waterproof ring (43); By arranging a first clamping block (21) on the waterproof wire clamp (2), the first clamping block (21) is clamped between the first clamping slot (51) and the second clamping slot (52), so that the gap between the wire (11) and the cover body can be sealed; by arranging a first convex rib (61) in the second clamping slot (52), the first convex rib (61) is an elastic member, and by arranging the first convex rib (61), the pressure between the second connecting block (41) and the waterproof wire clamp (2) can be increased, thereby ensuring that the waterproof wire clamp (2) can be firmly fixed on the cover body and can play a very good sealing role; by arranging a waterproof ring (43), water can be prevented from flowing into the gap between the upper cover (3) and the lower cover (4), and the waterproof ring (43) is arranged between the first clamping block (21) and the first clamping slot (51); The waterproof wire clamp (2) is provided with a second clamping block (22); the first connecting block (31) is provided with a third clamping slot (53) matched with the second clamping block (22); the second connecting block (41) is provided with a fourth clamping slot (54) matched with the second clamping block (22); a second convex ridge (62) is provided between the first clamping slot (51) and the third clamping slot (53); The waterproof wire clamp (2) is fixed on the cover body by providing a second clamping block (22), a third clamping slot (53) and a fourth clamping slot (54), and the pressure between the first connecting block (31) and the waterproof wire clamp (2) is increased by providing a second convex ridge (62); The waterproof wire clip (2) is provided with an anti-bending groove (23); A support plate (7) is provided between the upper cover (3) and the lower cover (4); the cross-sectional shape of the support plate (7) is L-shaped.

2. The built-in water purifier waterproof power adapter with humidity protection function according to claim 1, characterized in that: The upper cover (3) and the lower cover (4) are detachably connected.

3. The built-in water purifier waterproof power adapter with humidity protection function according to claim 1, characterized in that: Both ends of the upper cover (3) are provided with hanging ears (8).

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