CN216720908U - Prevent switching circuit and electronic equipment of into water malfunction - Google Patents

Abstract

The utility model discloses a switch circuit for preventing water inflow misoperation and electronic equipment, and belongs to the technical field of vehicle-mounted electronics. Wherein, this prevent into switching circuit of water malfunction includes: the voltage divider module, the switch module and the comparator module; the voltage division module is used for dividing the voltage of the first power supply and inputting the divided voltage to a first input end of the comparator module; the switch module comprises a first resistor and a switch element, a second input end of the comparator module is connected to a first power supply through the first resistor respectively, the second input end of the comparator module is grounded through the switch element, and the switch module is used for realizing a switch control function; the comparator module is used for generating a switch control signal and outputting the switch control signal to the microcontroller so as to realize the specific control function of the switch circuit for preventing the water inflow misoperation through the microcontroller. The switch circuit capable of preventing water inflow misoperation effectively avoids functional faults caused by water inflow of the switch, and improves the safety of the switch circuit.

Description

Prevent switching circuit and electronic equipment of into water malfunction

Technical Field

The utility model relates to the technical field of vehicle-mounted electronics, in particular to a switching circuit for preventing water inflow misoperation and electronic equipment.

Background

Electronic equipment with switches exposed in the air often has the problem of switch malfunction because of rain or air humidity causes, for example, electric two-wheeled vehicle is a convenient and fast vehicle, can satisfy various trip demands in people's daily life, use is increasingly extensive, but, electric two-wheeled vehicle function switch commonly used at present all is non-waterproof switch, switch such as on-vehicle headlight, indicator, loudspeaker, the using-way also does not shelter from, directly expose in the air, in bad environment such as rain and humidity, the switch leads to the switch to falsely switch on after intaking easily, cause functional failure, influence safety.

SUMMERY OF THE UTILITY MODEL

In view of this, an object of the embodiments of the present invention is to provide a switch circuit and an electronic device for preventing malfunction due to water inflow, so as to solve the technical problem of false on of the switch circuit due to water inflow.

The technical scheme adopted by the utility model for solving the technical problems is as follows:

according to an aspect of an embodiment of the present invention, there is provided a switching circuit for preventing a malfunction due to water inflow, including: the voltage divider module, the switch module and the comparator module;

the voltage division module is respectively connected with a first power supply and a first input end of the comparator module, and is used for dividing the voltage of the first power supply and inputting the divided voltage to the first input end of the comparator module;

the switch module comprises a first resistor and a switch element, a second input end of the comparator module is respectively connected to the first power supply through the first resistor and is grounded through the switch element, and the switch module is used for realizing a switch control function;

the output end of the comparator module is connected with a microcontroller, and the comparator module is used for generating a switch control signal according to signals input by the first input end of the comparator module and the second input end of the comparator module, outputting the switch control signal to the microcontroller, and realizing the specific control function of the switch circuit for preventing water inflow misoperation through the microcontroller.

Optionally, the voltage dividing module includes a second resistor and a third resistor, the second resistor is connected between the first power source and the first input terminal of the comparator module, the third resistor is connected between the first input terminal of the comparator module and ground, and the first power source is divided by the second resistor and the third resistor and then input to the first input terminal of the comparator module.

Optionally, the switch module further includes a unidirectional conducting element, the unidirectional conducting element includes a diode, an anode of the diode is connected to the second input terminal of the comparator module, and a cathode of the diode is grounded through the switch element.

Optionally, the first resistor and the second resistor have the same resistance, and the third resistor has a resistance smaller than a resistance of an equivalent resistor generated across the switching element due to water inflow when the switching element is turned off.

Optionally, the diode is a schottky diode.

Optionally, the first input end of the comparator module is a positive input end of the comparator module, and the second input end of the comparator module is a negative input end of the comparator module.

Optionally, the switch circuit for preventing water inflow misoperation further comprises a first filtering module;

the first filtering module comprises a fourth resistor and a first capacitor, the fourth resistor is connected between the anode of the diode and the second input end of the comparator module in series, and the first capacitor is connected between the second input end of the comparator module and the ground.

Optionally, the switch circuit for preventing water inflow misoperation further comprises a second filtering module;

the second filtering module comprises a fifth resistor and a second capacitor, one end of the fifth resistor is connected with the output end of the comparator module, the other end of the fifth resistor is connected with the microcontroller and one end of the second capacitor respectively, and the other end of the second capacitor is grounded.

Optionally, the fourth resistor and the fifth resistor have the same resistance value.

According to another aspect of the embodiments of the present invention, there is provided an electronic apparatus including the above-described switch circuit that prevents malfunction due to water inflow.

The switch circuit and the electronic equipment for preventing the water inflow misoperation comprise a voltage division module, a switch module and a comparator module; the voltage division module is respectively connected with a first power supply and a first input end of the comparator module, and is used for dividing the voltage of the first power supply and inputting the divided voltage to the first input end of the comparator module; the switch module comprises a first resistor and a switch element, a second input end of the comparator module is respectively connected to the first power supply through the first resistor and is grounded through the switch element, and the switch module is used for realizing a switch control function; the output end of the comparator module is connected with a microcontroller, and the comparator module is used for generating a switch control signal according to signals input by the first input end of the comparator module and the second input end of the comparator module, outputting the switch control signal to the microcontroller, and realizing the specific control function of the switch circuit for preventing water inflow misoperation through the microcontroller. Only need through adjustment first resistance and partial pressure module for the voltage that the first power was inputed to the first input of comparator module through the partial pressure module is less than the voltage of the second input of comparator module when the switch module intake, can effectively discern the switch and switch on because of the false switch-on of switch that the water arouses and the normal switch when the switch closed switches on, thereby has avoided the functional fault who leads to because of the switch intake, has promoted switch circuit's security.

Drawings

The utility model will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic diagram of one embodiment of a switch circuit for preventing water ingress malfunction;

FIG. 2 is a schematic diagram of another embodiment of a switch circuit for preventing water ingress malfunction according to the present invention;

FIG. 3 is a schematic circuit connection diagram of the switch circuit for preventing water ingress malfunction according to the present invention;

fig. 4 is another circuit connection schematic diagram of the switch circuit for preventing water from malfunction provided by the utility model.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the utility model and do not limit the utility model.

In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no specific meaning in itself. Thus, "module", "component" or "unit" may be used mixedly.

Example one

To solve the technical problem of false on of the switch circuit caused by water inflow in the prior art, this embodiment provides a switch circuit for preventing water inflow malfunction, please refer to fig. 1, where fig. 1 is a schematic diagram of an implementation manner of the switch circuit for preventing water inflow malfunction according to the embodiment of the present invention. This prevent into switching circuit of water malfunction includes: the voltage divider module 1, the switch module 2 and the comparator module 3; the voltage division module 1 is respectively connected with a first power supply VCC and a first input end of the comparator module 3, and is configured to divide the voltage of the first power supply VCC and input the divided voltage to the first input end of the comparator module 3; the switch module 2 includes a first resistor R1 and a switch element KEY, a second input terminal of the comparator module 3 is connected to the first power VCC through the first resistor R1, and is grounded through the switch element KEY, and the switch module 2 is configured to implement a switch control function; the output end of the comparator module 3 is connected with a microcontroller, and the comparator module is used for generating a switch control signal according to signals input by the first input end of the comparator module 3 and the second input end of the comparator module 3, and outputting the switch control signal to the microcontroller so as to realize the specific control function of the switch circuit for preventing the water inflow misoperation through the microcontroller.

Specifically, the voltage dividing module 1 divides the voltage of the first power VCC and inputs the divided voltage to the first input terminal of the comparator module 3. Under the condition that water does not enter a switch, the switch module 2 pulls down the second input end of the comparator module 3 to the ground when the switch element KEY is closed, at the moment, the voltage of the first input end of the comparator module 3 is higher than that of the second input end of the comparator module, the output end of the comparator module outputs high level to the microcontroller, and the microcontroller controls specific control functions corresponding to the switch circuit for preventing water inflow misoperation after detecting the high level signal, for example, a headlamp of the electric two-wheeled vehicle is turned on; when the switch is turned off, the switch module 2 pulls up the second input terminal of the comparator module 3 to the first power VCC through the first resistor R1, and at this time, the voltage of the first input terminal of the comparator module 3 is lower than that of the second input terminal thereof, and the output terminal thereof outputs a low level signal to the microcontroller. Under the condition that water enters the switch, when the switch module 2 is closed, the equivalent resistance R generated by water entering at two ends of the switch element KEY_{Water (W)}The voltage of the first input end of the comparator module 3 is higher than that of the second input end thereof, the output end thereof still outputs high level to the microcontroller, and the microcontroller controls specific control functions corresponding to the switching circuit for preventing water inflow misoperation after detecting the high level signal, for example, turning on a headlight of the electric two-wheeled vehicle; when the switch is turned off, the switch module 2 will generate the equivalent resistance R due to water inflow at the two ends of the switch when the switch element KEY is turned off_{Water (W)}Corresponding to being connected in series to two ends of the switching element KEY, the first resistor R1 and the equivalent resistor R_{Water (W)}A voltage (Vcc R) obtained by dividing the first power source VCC_{Water (W)})/(R1+R_{Water (I)}) The voltage is input to the second input terminal of the comparator module 3, and at this time, only the first resistor R1 and the voltage division module 1 need to be adjusted, so thatThe voltage of the first power VCC inputted to the first input terminal of the comparator module 3 through the voltage dividing module 1 is lower than the voltage of the first power VCC inputted to the first input terminal of the comparator module 3 through the first resistor R1 and the equivalent resistor R_{Water (W)}Dividing the voltage (Vcc R) input to the second input of the comparator module 3_{Water (W)})/(R1+R_{Water (W)}) The output end of the comparator module 3 can output a low level to the microcontroller, and the microcontroller controls to turn off a specific control function corresponding to the switch circuit for preventing the water inflow misoperation after detecting the low level signal, for example, turning off a headlamp of the electric two-wheeled vehicle. Therefore, false switch-on of the switch element KEY caused by water inflow and normal switch-on of the switch element KEY during closing are effectively identified, misoperation caused by water inflow of the switch is avoided, and reliability and safety of a switch circuit are improved. The comparator module 3 may, but is not limited to, employ a general comparator U1, the first power source VCC may, but is not limited to, employ an operating power source of the comparator module 3, and the equivalent resistor R_{Water (W)}The specific values are defined in the test standards of each industry, and the specific values are subject to the standards of each industry, and the embodiment does not limit the specific values.

Optionally, the first input terminal of the comparator module 3 is a positive input terminal of the comparator module 3, and the second input terminal of the comparator module 3 is a negative input terminal of the comparator module 3. At this time, the comparator module 3 outputs a high level signal to the microcontroller when the voltage of the positive input end is higher than that of the negative input end, and the microcontroller controls a specific control function corresponding to the switch circuit for preventing the water inlet misoperation after detecting the high level signal, for example, turning on a headlamp of the electric two-wheeled vehicle; the comparator module 3 outputs a low level signal to the microcontroller when the voltage of the positive input end is lower than the voltage of the negative input end, and the microcontroller controls to turn off a specific control function corresponding to the switch circuit for preventing the water inflow misoperation after detecting the low level signal, for example, turning off a headlamp of the electric two-wheel vehicle. Therefore, false switch-on of the switch element KEY caused by water inflow and normal switch-on of the switch element KEY during closing are effectively identified, misoperation caused by water inflow of the switch is avoided, and reliability and safety of a switch circuit are improved.

In an embodiment, please refer to fig. 3 and 4, fig. 3 is a circuit connection schematic diagram of a switch circuit for preventing water inflow malfunction according to the present invention, fig. 4 is another circuit connection schematic diagram of the switch circuit for preventing water inflow malfunction according to the present invention, specifically, fig. 3 is a circuit connection schematic diagram of the switch circuit for preventing water inflow malfunction when water is not supplied, fig. 4 is a circuit connection schematic diagram of the switch circuit for preventing water inflow malfunction when water is supplied, wherein a signal MCU indicates connection to a microcontroller. Voltage divider module 1 includes second resistance R2 and third resistance R3, second resistance R2 is connected first power VCC with between the first input of comparator module 3, third resistance R3 is connected between the first input of comparator module 3 and ground, first power VCC warp second resistance R2 with the third resistance R3 inputs after the partial pressure comparator module 3's first input.

In this embodiment, the voltage dividing module 1 may adopt, but is not limited to, a second resistor R2 and a third resistor R3, and the voltage dividing module 1 divides the voltage of the first power source VCC through the second resistor R2 and the third resistor R3 and inputs the divided voltage to the first input terminal of the comparator module 3.

Optionally, the resistance of the first resistor R1 is the same as that of the second resistor R2, and the resistance of the third resistor R3 is smaller than the equivalent resistor R generated across the switching element KEY due to water entering when the switching element KEY is turned off_{Water (W)}The resistance value of (c). By controlling the first resistor R1 and the second resistor R2 to have the same resistance, the third resistor R3 has a resistance smaller than the equivalent resistor R_{Water (W)}When the switching element KEY is turned off and water is introduced, the voltage (VCC R3)/(R2+ R3) of the first power VCC, which is divided by the second resistor R2 and the third resistor R3 and then input to the first input terminal of the comparator module 3, is lower than the voltage (VCC R) of the first power VCC, which is divided by the first resistor R1 and the equivalent resistor R1_{Water (W)}The divided voltage (Vcc R) is inputted to the second input terminal of the comparator module 3_{Water (W)})/(R1+R_{Water (W)}) Thereby controlling the output end of the comparator module 3 to output low level, and the microcontroller controls to close the concrete corresponding to the switch circuit for preventing water inflow misoperation after detecting the low level signalControl functions, for example, turning off the headlights of an electric two-wheeled vehicle. Therefore, through a circuit built by the hardware discrete device, false switch-on of the switch caused by water inflow and normal switch-on of the switch during switch closing are effectively identified, thereby avoiding false operation caused by water inflow of the switch and improving the reliability and safety of the switch circuit.

In one embodiment, referring to fig. 3 and fig. 4, the switch module 2 further includes a unidirectional conducting element, the unidirectional conducting element includes a diode D1, an anode of the diode D1 is connected to the second input terminal of the comparator module 3, and a cathode of the diode D1 is grounded through the switch element KEY.

In this embodiment, the unidirectional conducting element may be, but is not limited to, a diode D1, and the diode D1 plays a role of preventing reverse.

Optionally, the diode D1 is a schottky diode. Further optionally, the diode D1 is a low-current low-voltage-difference schottky diode, so that the effect on the switching function of the switch circuit for preventing the water ingress malfunction is reduced while the anti-reverse function is performed.

In one embodiment, please refer to fig. 2-4, wherein fig. 2 is a schematic diagram of another embodiment of the switch circuit for preventing water malfunction according to the present invention. The switch circuit for preventing water inflow misoperation also comprises a first filtering module 4; the first filtering module 4 comprises a fourth resistor R4 and a first capacitor C1, the fourth resistor R4 is connected in series between the anode of the diode D1 and the second input terminal of the comparator module 3, and the first capacitor C1 is connected between the second input terminal of the comparator module 3 and ground.

In this embodiment, the first filtering module 4 may employ, but is not limited to, a fourth resistor R4 and a first capacitor C1. The first filtering module 4 plays a role in filtering noise caused by jitter of the switching element KEY and interference signals on the lead wires. Optionally, the fourth resistor R4 is a K Ω resistor, and the first capacitor C1 is a μ F capacitor.

In one embodiment, the switch circuit for preventing water from misoperation further comprises a second filtering module 5; the second filtering module 5 includes a fifth resistor R5 and a second capacitor C2, one end of the fifth resistor R5 is connected to the output end of the comparator module 3, the other end of the fifth resistor R5 is connected to the microcontroller and one end of the second capacitor C2, and the other end of the second capacitor C2 is grounded.

In this embodiment, the second filtering module 5 may employ, but is not limited to, a fifth resistor R5 and a second capacitor C2. The second filtering module 5 plays a role in filtering noise caused by the jitter of the switching element KEY and interference signals on the lead wires. Optionally, the fifth resistor R5 is a K Ω resistor, and the second capacitor C2 is a μ F capacitor.

Optionally, the fourth resistor R4 has the same resistance as the fifth resistor R5. In order to filter out noise waves of the dither of the switching element KEY and interference signals on the supply lines at the second input and output of the comparator module 3, respectively.

The switch circuit for preventing water inflow misoperation in the embodiment comprises a voltage division module 1, a switch module 2 and a comparator module 3; the voltage division module 1 is respectively connected with a first power supply VCC and a first input end of the comparator module 3, and is configured to divide the voltage of the first power supply VCC and input the divided voltage to the first input end of the comparator module 3; the switch module 2 includes a first resistor R1 and a switch element KEY, a second input terminal of the comparator module 3 is connected to the first power VCC through the first resistor R1, and is grounded through the switch element KEY, and the switch module 2 is configured to implement a switch control function; the output end of the comparator module 3 is connected with a microcontroller, and the comparator module is used for generating a switch control signal according to signals input by the first input end of the comparator module 3 and the second input end of the comparator module 3, and outputting the switch control signal to the microcontroller so as to realize the specific control function of the switch circuit for preventing the water inflow misoperation through the microcontroller. Only need through adjustment first resistance R1 and voltage division module 1 for the voltage that first power VCC inputed comparator module 3's first input through voltage division module 1 is less than the voltage of switch module 2 input comparator module 3's second input when intaking, can effectively discern the switch and switch on because of the switch that the intaking arouses false switch-on and the normal switch when the switch closes switches on, thereby avoided the functional fault because of the switch intaking leads to, switch circuit's security has been promoted.

Example two

An embodiment of the present invention provides an electronic device, which includes the switch circuit for preventing water from malfunctioning of the first embodiment. The electronic equipment of this embodiment only needs through adjustment first resistance and partial pressure module for the voltage that the first power was inputed to the first input of comparator module through the partial pressure module is less than the voltage of the second input of comparator module when the switch module intake, and the switch that can effectively discern the switch and arouse because of intaking switches on and switches on with the normal switch when the switch closes, thereby has avoided the functional fault who leads to because of the switch intakes, has promoted switch circuit's security. The specific structure of the switch circuit for preventing water ingress malfunction is as described in the above embodiment, and is not described herein again.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the utility model as defined in the appended claims.

Claims (10)

1. The utility model provides a prevent switch circuit of intaking malfunction which characterized in that, prevent the switch circuit of intaking malfunction includes: the voltage divider module, the switch module and the comparator module;

the voltage division module is respectively connected with a first power supply and a first input end of the comparator module, and is used for dividing the voltage of the first power supply and inputting the divided voltage to the first input end of the comparator module;

the switch module comprises a first resistor and a switch element, a second input end of the comparator module is respectively connected to the first power supply through the first resistor and is grounded through the switch element, and the switch module is used for realizing a switch control function;

the output end of the comparator module is connected with a microcontroller and used for generating a switch control signal according to signals input by the first input end of the comparator module and the second input end of the comparator module and outputting the switch control signal to the microcontroller, so that the specific control function of the switch circuit for preventing the water inflow misoperation is realized through the microcontroller.

2. The switch circuit of claim 1, wherein the voltage divider module comprises a second resistor and a third resistor, the second resistor is connected between the first power source and the first input terminal of the comparator module, the third resistor is connected between the first input terminal of the comparator module and ground, and the first power source is divided by the second resistor and the third resistor and then input to the first input terminal of the comparator module.

3. The switching circuit of claim 2, wherein the switching module further comprises a one-way conduction element, the one-way conduction element comprises a diode, an anode of the diode is connected to the second input terminal of the comparator module, and a cathode of the diode is grounded through the switching element.

4. The switch circuit of claim 3, wherein the first resistor and the second resistor have the same resistance, and the third resistor has a resistance smaller than an equivalent resistance across the switching element due to water inflow when the switching element is turned off.

5. The switching circuit for preventing water ingress malfunction as claimed in claim 4, wherein said diode is a Schottky diode.

6. The switch circuit of claim 5, wherein the first input terminal of the comparator module is a positive input terminal of the comparator module, and the second input terminal of the comparator module is a negative input terminal of the comparator module.

7. The water malfunction prevention switch circuit of claim 6, further comprising a first filtering module;

the first filtering module comprises a fourth resistor and a first capacitor, the fourth resistor is connected between the anode of the diode and the second input end of the comparator module in series, and the first capacitor is connected between the second input end of the comparator module and the ground.

8. The water malfunction prevention switch circuit of claim 7, further comprising a second filtering module;

the second filtering module comprises a fifth resistor and a second capacitor, one end of the fifth resistor is connected with the output end of the comparator module, the other end of the fifth resistor is connected with the microcontroller and one end of the second capacitor respectively, and the other end of the second capacitor is grounded.

9. The switch circuit for preventing water malfunction according to claim 8, wherein the fourth resistor and the fifth resistor have the same resistance.

10. An electronic device, characterized in that it comprises a switch circuit for preventing malfunction due to water ingress according to any of claims 1-9.

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