CN217007525U

CN217007525U - Water inlet detection circuit and water inlet equipment

Info

Publication number: CN217007525U
Application number: CN202123345642.XU
Authority: CN
Inventors: 章哲宇; 陈超; 马先明; 陈志列
Original assignee: Shenzhen Qianhai Yanxiang Asia Pacific Electronic Equipment Technology Co ltd
Current assignee: Shenzhen Qianhai Yanxiang Asia Pacific Electronic Equipment Technology Co ltd
Priority date: 2021-12-28
Filing date: 2021-12-28
Publication date: 2022-07-19
Anticipated expiration: 2031-12-28

Abstract

The utility model provides a water inlet detection circuit and water inlet equipment, wherein the water inlet detection circuit comprises: the device comprises a contact module, a power supply module and a water inlet detection circuit module; the contact module is used for providing a first voltage for the power supply module when the power supply module is charged so as to charge the power supply module; the low-voltage power supply end is used for providing a second voltage; the change-over switch unit is used for switching on the second connecting end and the third connecting end when the voltage difference value between the first connecting end and the second connecting end or between the first connecting end and the third connecting end reaches a switching-on voltage; the signal output unit is used for outputting the water inlet signal when the voltage at the third connecting end reaches the reference voltage. The utility model can reduce the volume of the water inlet equipment.

Description

Water inlet detection circuit and water inlet equipment

Technical Field

The utility model relates to the technical field of integrated circuits, in particular to a water inlet detection circuit and water inlet equipment.

Background

With the development of underwater equipment, more and more ginseng is engaged in underwater activities, such as salvage, rescue, entertainment diving and the like. All of these people who participate in underwater activities need to be equipped with wearable underwater devices to know the state and safety of their own underwater activities.

Traditional equipment of entrying needs the user to carry out a series of settings and operations on the surface of water, and the manual equipment of entrying that opens makes it get into operating condition, and this kind of operation is not intelligent enough on the one hand, complex operation, and on the other hand is the power saving inadequately.

With the development of the technology, the current water inlet equipment has the function of automatically working when entering water, the function is realized by automatically identifying whether the equipment touches water or not, and when the equipment is detected to enter the water, the equipment automatically enters a working state. However, the existing water inlet detection method is that more sensors or additional contacts are additionally added on the equipment, so that the surface of the water inlet equipment is dug too much, the waterproof requirement on the structure is higher, the cost of the water inlet equipment is increased, the volume of the water inlet equipment is increased, and the influence on the miniaturization design of the water inlet equipment is larger.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the water inlet detection circuit and the water inlet equipment provided by the utility model simplify the structure of the water inlet equipment by increasing the functions of the contact module, thereby reducing the volume of the water inlet equipment and improving the space utilization rate of the water inlet equipment.

In a first aspect, the present invention provides an ingress detection circuit, comprising: the device comprises a contact module, a power supply module and a water inlet detection circuit module;

the contact module is used for providing a first voltage for the power supply module when the power supply module is charged so as to charge the power supply module;

the contact module includes: a first contact and a second contact;

the water inlet detection circuit module comprises: the circuit comprises a selector switch unit, a signal output unit, a first resistor device, a second resistor device, a one-way conduction unit and a low-voltage power supply end;

the low-voltage power supply end is used for providing a second voltage;

the first contact is electrically connected with the power supply module, the second contact is grounded, the first contact is electrically connected with the cathode of the unidirectional conduction unit, the anode of the unidirectional conduction unit is electrically connected with one end of the first resistor device, and the other end of the first resistor device is electrically connected with the low-voltage power supply end;

the unidirectional conduction unit is used for keeping conduction when positive voltage is applied to the unidirectional conduction unit and keeping cutoff when negative voltage is applied to the unidirectional conduction unit;

the changeover switch unit includes: the first connecting end, the second connecting end and the third connecting end;

the first connecting end is electrically connected with the cathode of the unidirectional conduction unit and the first contact, the third connecting end is electrically connected with one end of the second resistor device and the signal output unit, the other end of the second resistor device is electrically connected with the low-voltage power supply end, and the second connecting end is electrically connected with a first grounding end;

the change-over switch unit is used for switching on the second connecting end and the third connecting end when the voltage difference value between the first connecting end and the second connecting end or between the first connecting end and the third connecting end reaches a switching-on voltage;

the signal output unit is used for outputting the water inlet signal when the voltage at the third connecting end reaches the reference voltage.

Optionally, the resistive component comprises: a first resistive device and a second resistive device;

the anode of the unidirectional conduction unit is electrically connected with one end of the first resistor device, and the other end of the second resistor device is electrically connected with the low-voltage power supply end;

the third connecting end is electrically connected with one end of the second resistor device and the signal output unit, and the other end of the second resistor device is electrically connected with the low-voltage power supply end.

Optionally, the signal output unit includes: a comparator;

the comparator includes: a first input, a second input and an output;

the first input end is electrically connected with the third connecting end, and the second input end is electrically connected with the reference sub-circuit module;

the reference sub-circuit module is used for providing the reference voltage to the second input end;

the comparator is used for judging the relative size of the voltage at the third connecting end and the reference voltage, outputting a high level when the voltage at the third connecting end reaches the reference voltage, and taking the high level as a water inlet signal.

Optionally, the reference sub-circuit module comprises: a third resistive device and a fourth resistive device;

one end of the third resistor device is electrically connected with the low-voltage power supply end, the other end of the third resistor device is electrically connected with the second input end and one end of the fourth resistor device, and the other end of the fourth resistor device is electrically connected with the second grounding end.

Optionally, the water inlet detection circuit further includes: a processing module;

the processing module is electrically connected with the signal output unit;

the processing module is used for receiving the water inlet signal and outputting water inlet information when receiving the water inlet signal.

Optionally, the comparator further comprises: a power supply access end;

the power supply access end is electrically connected with the low-voltage power supply end;

the water inlet detection circuit module further comprises: a filter capacitor;

one end of the filter capacitor is electrically connected with the power supply access end, and the other end of the filter capacitor is electrically connected with a third grounding end.

Optionally, the switch comprises: a field effect transistor, a triode, or a photovoltaic isolator.

Optionally, a gate of the field effect transistor is electrically connected to the first connection terminal, a source of the field effect transistor is electrically connected to the second connection terminal, and a drain of the field effect transistor is electrically connected to the third connection terminal.

Optionally, the water inlet detection circuit further includes: a power management module;

the power management module is electrically connected with the first contact and the power module respectively;

the power management module is used for adjusting the first voltage so as to charge the power module with the adjusted first voltage.

Optionally, the switch unit includes: an over-value switching subunit;

when the switch unit is an over-value switching subunit, the breakover voltage is less than the second voltage;

the over-voltage switching subunit is used for switching on the second connecting end and the third connecting end when the voltage of the first connecting end and the second connecting end is not less than the switching-on voltage;

the over-value switching subunit includes: an N-type field effect transistor, an npn-type triode or a photoelectric isolator.

Optionally, the switch unit further includes: a low value switching subunit;

when the switch unit is a low-value switching subunit, the breakover voltage is greater than the second voltage;

the low value switching subunit is used for switching on the second connecting end and the third connecting end when the voltage of the first connecting end and the second connecting end is not greater than the switching-on voltage;

the low value switching subunit includes: p-type field effect transistor or pnp-type triode.

Optionally, the signal output unit further includes: the signal output subunit, the fourth connecting end, the fifth connecting end, the sixth connecting end and the signal output end;

the signal output subunit is electrically connected with the third connecting end through a fourth connecting end, the signal output subunit is electrically connected with a second grounding end through a fifth connecting end, the signal output subunit is electrically connected with one end of a fifth resistor through a sixth connecting end, the other end of the fifth resistor is electrically connected with a low-voltage power supply end, and the signal output end is electrically connected with the sixth connecting end;

the signal output subunit is used for outputting an inlet water signal through the signal output end when the electric potential of the third connecting end is not greater than the reference electric potential;

the signal output subunit includes: an N-type field effect transistor, an npn-type triode or a photoelectric isolator.

Optionally, the first voltage is not lower than 5V, and the second voltage includes: 1.8V.

In a second aspect, the present embodiment provides a water inlet device, including: an ingress water detection circuit as claimed in any one of the preceding claims.

According to the water inlet detection circuit and the water inlet equipment provided by the embodiment of the utility model, the contact module can be used for charging the power supply module and simultaneously can be used for detecting water inlet, when the contact module is contacted with water, the signal output unit can output the water inlet signal to indicate that the water inlet equipment is below the water surface, the structure is simple, the structure of the water inlet equipment is simplified, the size of the water inlet equipment is reduced, and the space utilization rate of the water inlet equipment is improved.

Drawings

FIG. 1 is a schematic block diagram of an ingress detection circuit according to an embodiment of the present application;

FIG. 2 is a schematic circuit diagram of an ingress detection circuit according to an embodiment of the present application;

FIG. 3 is a schematic block diagram of a photovoltaic isolator according to an embodiment of the present application;

FIG. 4 is a partial schematic circuit diagram of an embodiment of the present application for an ingress detection circuit;

fig. 5 is a schematic structural diagram of a water inlet device according to an embodiment of the present application.

Reference numerals

1. A processing module; 2. a contact module; 21. a first contact; 22. a second contact; 3. a power supply module; 4. An inlet detection circuit module; 41. a changeover switch unit; 411. a first connection end; 412. a second connection end; 413. a third connection end; q1, N-type field effect transistor; 42. a signal output unit; u1, comparator; 421. A power supply access end; 422. a safety ground terminal; 423. a first input terminal; 424. a second input terminal; 425. An output end; 426. a signal output terminal; 427. a fourth connection end; 428. a fifth connection end; 429. a sixth connection end; 43. a reference sub-circuit module; r1, a first resistance device; r2, a second resistance device; r3, third resistance device; r4, fourth resistance device; d1, a unidirectional conduction unit; c1, a filter capacitor; 44. A low voltage power supply terminal; 5. a power management module; u2, a charging chip; 511. a power supply terminal; 512. a power supply terminal; 513. connecting a ground end; c2, an energy storage capacitor; 52. a fourth ground terminal; 61. a housing; 62. a display module; 71. a first ground terminal; 72. a second ground terminal; 73. a third ground terminal; q2, P-type field effect transistor; r5, fifth resistance device; r6, sixth resistive device.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is to be noted that, in the present invention, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, 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.

In a first aspect, this embodiment provides an ingress water detection circuit, which, with reference to fig. 1 and fig. 2, includes: the device comprises a processing module 1, a power management module 5, a contact module 2, a power module 3 and a water inlet detection circuit module 4.

The processing module 1 is electrically connected with the power management module 5 and the water inlet detection circuit module 4 respectively; the water inlet detection circuit module 4 is respectively and electrically connected with the power management module 5 and the contact module 2; the power management module 5 is electrically connected to the contact module 2 and the battery module, respectively.

The power module 3 is used for providing electric energy for the water inlet detection circuit so as to ensure that the water inlet detection circuit works normally; the processing module 1 is used for receiving the water inlet signal and outputting water inlet information when receiving the water inlet signal; the contact module 2 is used for providing a first voltage to the power module 3 when the power module 3 is charged so as to charge the power module 3; the power management module 5 is configured to adjust the first voltage, so as to charge the power module 3 with the adjusted first voltage.

Further, the contact module 2 includes: a first contact 21 and a second contact 22. The water inlet detection circuit module 4 includes: the circuit comprises a switch unit 41, a signal output unit 42, a reference sub-circuit module 43, a resistor component, a unidirectional conducting unit D1, a filter capacitor C1 and a low-voltage power supply terminal 44.

Wherein the changeover switch unit 41 includes: a first connection end 411, a second connection end 412, and a third connection end 413. The first contact 21 is electrically connected to the power module 3, the second contact 22 is grounded, the first contact 21 is electrically connected to the cathode of the unidirectional conducting unit D1, the anode of the unidirectional conducting unit D1 is electrically connected to one end of the resistor assembly, and the other end of the resistor assembly is electrically connected to the low-voltage power supply terminal 44.

The resistive component includes at least one resistive device. When the resistance component is a resistance device, the unidirectional conducting unit D1 and the change-over switch unit 41 share one resistance device to be electrically connected with the low-voltage power supply terminal 44; when the resistor assembly is two resistor devices, the unidirectional conducting unit D1 and the switch unit 41 are electrically connected to the low voltage power supply terminal 44 through one resistor device respectively. In this embodiment, the resistance component includes: a first resistive device R1 and a second resistive device R2.

The switch unit 41 is configured to connect the second connection end 412 and the third connection end 413 when a voltage difference between the first connection end 411 and the second connection end 412 or the third connection end 413 reaches a connection voltage. The signal output unit 42 is configured to output an incoming water signal when the potential of the third connection terminal 413 reaches the reference potential. The changeover switch unit 41 includes: a field effect transistor, a triode, a photoelectric isolator or the like. The signal output unit 42 includes: comparator U1 or a signal output subunit. Wherein, the magnitude of the turn-on voltage is determined by the functional structure of the switch unit 41; the magnitude of the reference potential is determined by the functional structure of the signal output unit 42 or the functional structure of the changeover switch unit 41; when the signal output unit 42 is a signal output subunit, the signal output unit 42 further includes: fourth link, fifth link, sixth link and signal output part.

The switch unit 41 is an over-value switching subunit or a low-value switching subunit. When the switch unit 41 is an over-value switching subunit, the turn-on voltage is smaller than the second voltage; the excessive value switching subunit is configured to connect the second connection terminal 412 and the third connection terminal 413 when the voltages of the first connection terminal 411 and the second connection terminal 412 are not less than the connection voltage; the over-value switching subunit includes: an N-type field effect transistor, an npn-type triode or a photoelectric isolator. When the switch unit 41 is a low-value switching subunit, the turn-on voltage is greater than the second voltage; the low-level switching sub-unit is configured to connect the second connection terminal 412 and the third connection terminal 413 when the voltages of the first connection terminal 411 and the third connection terminal 413 are not greater than a connection voltage; the low value switching subunit includes: p-type field effect transistor or pnp-type triode.

When the signal output unit 42 is the comparator U1 and the switching unit 41 is the N-type fet Q1, the signal output unit 42 is configured to output the input water signal through the comparator U1 when the voltage at the third connection terminal 413 is greater than the reference voltage.

When the signal output unit 42 is the comparator U1 and the switching unit 41 is the pfet Q2, the signal output unit 42 is configured to output the input water signal through the comparator U1 when the voltage at the third connection terminal 413 is not greater than the reference voltage.

When the signal output unit 42 is a signal output subunit and the switching unit 41 is a P-type field effect transistor Q1, the output subunit 42 is configured to output the incoming water signal when the voltage at the third connection terminal 413 is not greater than the reference potential.

In this embodiment, the switch unit 41 is an N-type fet Q1, and the N-type fet Q1 is an N-type fet. The gate of the N-type field effect transistor Q1 is electrically connected to the first connection terminal 411, the source of the N-type field effect transistor Q1 is electrically connected to the second connection terminal 412, and the drain of the N-type field effect transistor Q1 is electrically connected to the third connection terminal 413; the on voltage was 1.8V.

In the present embodiment, the signal output unit 42 is a comparator U1. The comparator U1 includes: power input 421, safety ground 422, first input 423, second input 424, and output 425. In the present embodiment, the first input end 423 is a positive input end, and the second input end 424 is a negative input end. The power input terminal 421 is electrically connected to the third connection terminal 413, the safety ground terminal 422 is electrically connected to the second ground terminal 72, the first input terminal 423 is electrically connected to the third connection terminal 413, the second input terminal 424 is electrically connected to the reference sub-circuit module 43, and the output terminal 425 is electrically connected to the processing module 1.

The unidirectional conducting cell D1 is used to keep conducting when a positive voltage is applied to the unidirectional conducting cell D1 and keep intercepting when a negative voltage is applied to the unidirectional conducting cell D1. The reference sub-circuit module 43 is used for providing the reference voltage to the second input terminal 424. The comparator U1 is configured to determine the voltage at the third connection terminal 413 and the reference voltage, and output a high level when the voltage at the third connection terminal 413 is greater than the reference voltage, and use the high level as the water entry signal. Wherein the turn-on voltage is less than the second voltage; the unidirectional conducting unit D1 may be a control circuit composed of a valve or a bridge arm, and may also be a diode, but is not limited thereto, and in this embodiment, the unidirectional conducting unit D1 is a diode.

The low-voltage power supply end 44 is electrically connected with the power supply module 3 through the power management module 5; the voltage output by the power module 3 is subjected to voltage reduction processing by the power management module 5, and then the second voltage is output to the low-voltage power supply terminal 44. In an embodiment, the contact module 2 is a USB power contact module 2; the low voltage power supply terminal 44 is VCC1 — 8water det; the processing module 1 is an MCU (micro controller Unit); the first voltage is not lower than 5V, and the second voltage and the turn-on voltage are both 1.8V, but not limited thereto.

The processing module 1 is electrically connected with the output end 425 of the signal output unit 42; the power management module 5 is electrically connected with the cathode of the unidirectional conducting unit D1 through the VBUS power signal line, the first contact 21 and the first connection end 411 in common; the second contact 22 is electrically connected to a first ground 71; an anode of the unidirectional conducting unit D1 is electrically connected to one end of the first resistor device R1, and the other end of the first resistor device R1, one end of the filter capacitor C1, the power supply input end 421, and the other end of the second resistor device R2 are electrically connected to the low-voltage power supply end 44; the safety ground 422 is electrically connected to the second ground 72; the other end of the filter capacitor C1 is electrically connected to a third ground terminal 73; the second connection end 412 is electrically connected to the first ground end 71; one end of the second resistor device R2 and the first input end 423 are commonly electrically connected to the third connection end 413, and the second input end 424 is electrically connected to the reference sub-circuit module 43.

Wherein, can play the effect of filtering, stable pressure to the detection circuit module 4 of entrying through setting up filter capacitor C1 to can improve the rate of accuracy that the entrying detected.

The reference sub-circuit module 43 includes: a third resistive device R3 and a fourth resistive device R4. One end of the third resistor device R3 is electrically connected to the low voltage power supply terminal 44, the other end of the third resistor device R3 is electrically connected to the second input terminal 424 and one end of the fourth resistor device R4, and the other end of the fourth resistor device R4 is electrically connected to the second ground terminal 72.

The reference voltage may be specifically adjusted by adjusting a resistance value of the third resistance device R3 and/or a resistance value of the fourth resistance device R4. In this embodiment, the resistance value of the third resistance device R3 and the resistance value of the fourth resistance device R4 are the same, and are both 1 mho, and the reference voltage is 0.9V, but the utility model is not limited thereto.

Further, the power management module 5 includes: charging chip U2, energy storage capacitor C2 and fourth ground 52. The charging chip U2 includes: a power supply terminal 511, a power supply terminal 512 and a ground terminal 513. One end of the energy storage capacitor C2 and the power supply end 511 are jointly electrically connected with a VBUS power supply signal wire; the other end of the energy storage capacitor C2, the ground terminal 513 and the negative electrode of the power module 3 are electrically connected to the fourth ground terminal 52; the positive electrode of the power module 3 is electrically connected with the power supply end 512.

When the contact module 2 is connected to an external power supply, the charging chip U2 adjusts the output voltage of the external power supply to charge the power module 3. During the discharging process of the power module 3, the charging chip U2 adjusts the output voltage of the power module 3 to supply power to other devices.

The contact module 2 in the water inlet detection circuit has two functions simultaneously, one is the function of charging the submersible power module 3, and the other is the function of serving as a detection contact for water inlet detection. And when realizing these two merit simultaneously, through setting up power management module 5 when contact module 2 charges power module 3, can play the effect of protection to the detection circuitry that entries, prevent that outside power from causing the damage to the detection circuitry that entries and corresponding system.

When the contact module 2 is used as a water contact, the power management module 5 can be used as the isolation of the power module 3, so that the contact module 2 is ensured not to cause the short circuit of the water inlet detection circuit when contacting water. Therefore, when the contact module 2 is used for water entry detection, the water entry detection circuit sends a water entry signal to the MCU when detecting that the first contact 21 and the second contact 22 in the contact module 2 are connected together, and after detecting the water entry signal, the MCU continues subsequent logic operations to display information that the water entry device enters the water below the water surface. Therefore, the MCU is not required to intervene in the generation of the water entry signal, and the MCU only needs to obtain the water entry signal in an interruption or inquiry mode, so that the power consumption of the MCU is reduced.

The working principle of the water inlet detection circuit is as follows:

under the non-charging and non-water-entry conditions, the contact module 2 has no input, the VBUS power signal line is pulled up to 1.8V by the low voltage power supply terminal 44 through the first resistance device R1 and the unidirectional conducting unit D1, VGS (voltage difference between gate and source in field effect transistor) of the switch unit 41 in the water entry detection circuit is 1.8V, and when the conducting voltage of the switch unit 41 is reached, the switch unit 41 is conducted, and when the level on the third connection terminal 413 of the switch unit 41 is pulled to the ground, that is, the voltage at the third connection terminal 413 of the switch unit 41 is 0V. The reference potential of the second input terminal 424 of the comparator U1 is obtained by dividing the voltage by the third resistor and the fourth resistor, and since the resistance value of the third resistor R3 is the same as that of the fourth resistor R4, the voltage provided by the low voltage power supply terminal 44 is 1.8V, and the voltage of the second input terminal 424 is 0.9V. At this time, the voltage of the first input end 423 of the comparator U1 is lower than the voltage of the second input end 424, so the comparator U1 outputs a low level, and the MCU can determine that the contact module 2 is above the water level according to the received low level.

When the contact module 2 is externally connected with a power supply to charge the power module 3, the VBUS power signal line is 5V or other higher voltage, at this time, one path of the VBUS power signal line supplies power to the power module 3 and a corresponding system through the power management module 5, the other path of the VBUS power signal line enters the water inlet detection circuit module 4, due to the existence of the one-way conduction unit D1, the VBUS power signal line cannot supply power to the low-voltage power supply end 44 through the one-way conduction unit D1, and the low-voltage power supply end 44 is protected by the one-way conduction unit D1. The voltage transmitted by the VBUS power signal line passes through the first connection terminal 411 of the switch unit 41, and the voltage transmitted by the VBUS power signal line is not less than the turn-on voltage of the switch unit 41, so that the switch unit 41 is turned on, and the logic of the water-in detection circuit is consistent with the non-charging and non-water-in states, so that the output terminal 425 of the comparator U1 outputs a low level. This also has guaranteed that the equipment of intaking is under the condition of charging, or under the condition of not having the charge, and the signal that intakes to detect keeps unanimous, can not lead to the condition emergence of erroneous judgement. By using the change-over switch unit 41 in the water inlet detection circuit, the subsequent circuits in the water inlet detection circuit are protected, and the power supply isolation function is achieved.

Specifically, the input end of the general comparator U1 has a low withstand voltage, so that the VBUS power signal line cannot be directly connected to the first input end 423, and the switch unit 41 can withstand a high voltage, so that the power protection module formed by the switch unit 41 and the unidirectional conducting unit D1 prevents the external power from damaging the weak power supply in the water inlet detection circuit, such as the signal output unit 42, when the external power is input and the MCU is performing the circuit safety check.

When the contact module 2 is immersed in water, the contact module 2 can be equivalent to a small resistance due to the weak conductivity of water when contacting water, and at this time, the VGS of the switch unit 41 in the water immersion detection circuit is divided into voltages which are gradually decreased, and the switch unit 41 is gradually changed from the on state to the semi-on state, so that the potential of the third connection terminal 413 of the switch unit 41 is gradually increased, and thus the potential of the first input terminal 423 of the comparator U1 is greater than the potential of the second input terminal 424 when the contact module 2 contacts water, so that the output terminal 425 of the comparator U1 outputs a high level. When the MCU detects a high level, the water inlet equipment is indicated to be in water. In the present embodiment, the signal output unit 42 outputs a high level, which means that the signal output unit 42 outputs the water-in signal.

The water inlet detection circuit is characterized in that the water inlet detection circuit module 4 is arranged, so that the contact module 2 can be used for charging the power module 3 and can be used for detecting water inlet, when the contact module 2 contacts water, the signal output unit 42 can output a water inlet signal to indicate that the water inlet equipment is arranged below the water surface, the structure is simple, the structure of the water inlet equipment is simplified, the size of the water inlet equipment is reduced, the space utilization rate of the water inlet equipment is improved, and the manufacturing cost of the water inlet equipment is reduced.

In an alternative embodiment, in conjunction with fig. 3, the diverter switch is a photo isolator. The optoelectronic isolator includes: a light emitter and a light receiver. One end of the light emitter is electrically connected with the first connection end 411; the other end of the light emitter is electrically connected with the second connecting end 412; one end of the light receiver is electrically connected to the third connection terminal 413, and the other end of the light receiver is grounded. When the voltage at the two ends of the light emitter reaches the conducting voltage, the light receiver is conducted; when the voltage across the light emitter does not reach the turn-on voltage, the light receiver is turned off.

In a second aspect, the present embodiment provides an incoming water detection circuit, and with reference to fig. 2 and fig. 4, the present embodiment provides a difference between the incoming water detection circuit and the incoming water detection circuit in the first aspect, in that: the water inlet detection circuit module 4 includes: a switch unit 41, a signal output unit 42, a resistance component, a unidirectional conducting unit D1 and a low voltage power supply terminal 44.

Specifically, the switch unit 41 is a P-type field effect transistor Q2; the turn-on voltage is greater than the second voltage; the switch unit 41 is configured to connect the second connection terminal 412 and the third connection terminal 413 when the voltages of the first connection terminal 411 and the second connection terminal 412 are not greater than a connection voltage; the signal output unit 42 includes: an N-type field effect transistor Q1 and a signal output terminal 426; the signal output unit 42 is used for outputting an inlet water signal through a signal vehicle speed outlet end when the potential of the third connecting end 413 is smaller than the reference potential; the gate of the nfet Q1 is electrically connected to the third connection terminal 413 through the fourth connection terminal 427, the source of the nfet Q1 is electrically connected to the second ground terminal 72 through the fifth connection terminal 428, and the drain of the nfet Q1 is electrically connected to the low-voltage power supply terminal 44 through the sixth connection terminal 429 and the fifth resistor device R5; the resistance component is a resistance device.

When the switching unit 41 is a fet, the on-voltage thereof is determined by parameters of the fet. In this embodiment, the turn-on voltage of the pfet Q2 and the turn-on voltage of the nfet Q1 are 1.8V; the resistance device is a sixth resistance device R6; the unidirectional conducting unit D1 shares the sixth resistance device R6 with the switch unit 41 to be electrically connected with the low voltage power supply terminal 44.

The working principle of the water inlet detection circuit in the embodiment is as follows:

when the contact module 2 is externally connected with a power supply to charge the power supply module 3, the voltage transmitted by the VBUS power signal wire is 5V, and the voltage VCC _ WATER _ DET of the WATER contact module 2 is 1.8V, then VGS of the P-type field effect transistor Q2 is 3.2V and is larger than the conduction voltage, so that the P-type field effect transistor Q2 is not conducted at the moment, and because the one-way conduction unit D1 exists, the 5V voltage transmitted by the VBUS power signal wire cannot enter the WATER detection circuit module 4, and the circuit is protected. And since the pfet Q2 is not conducting, the gate of the nfet Q1 is pulled up to 1.8V by the sixth resistor R6, which is not less than the conducting voltage of the nfet Q1, the nfet Q1 is conducting, and the low-voltage power supply terminal 44 outputs low level.

Under the conditions of no charging and no water entering, the grid of the P-type field effect transistor Q2 is pulled to high level by the unidirectional conduction unit D1, at this time, the voltages of the two electrodes of the unidirectional conduction unit D1 are the same, the P-type field effect transistor Q2 is not conducted, the subsequent state is the same as the case that the contact module 2 is externally connected with a power supply to charge the power supply module 3, and the low-voltage power supply end 44 outputs low level to the signal output end 426.

When the contact module 2 enters water, the gate of the P-type field effect transistor Q2 is pulled down, VGS of the P-type field effect transistor Q2 is-0.7V and is not greater than the turn-on voltage, at this time, the P-type field effect transistor is turned on, the gate of the N-type field effect transistor Q1 is pulled down, the N-type field effect transistor Q1 is not turned on, and at this time, the low-voltage power supply terminal 44 outputs a high level to the signal output terminal 426.

Through the logic, when the low-voltage power supply end 44 is in a high level, the water-entering equipment is in a water-touching state; the other status signal output terminals 426 are all at low level, indicating that the water inlet equipment is not in contact with water.

In a third aspect, this embodiment provides a water inlet apparatus, and with reference to fig. 5, the water inlet apparatus includes: a housing 61, a display module 62 and an incoming water detection circuit as described in any of the above aspects. The processing module 1, the power management module 5, the power module 3 and the water inlet detection circuit module 4 are all positioned in the shell 61; the display module 62 and the contact module 2 are both fixedly arranged on the surface of the casing 61 and are connected with the casing 61 in a sealing way; the display module 62 is electrically connected to the processing module 1. The display module 62 is used for displaying the water inlet information and the working state of the power module 3.

The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An incoming water detection circuit, comprising: the device comprises a contact module, a power supply module and a water inlet detection circuit module;

the contact module includes: a first contact and a second contact;

the water inlet detection circuit module comprises: the device comprises a selector switch unit, a signal output unit, a resistance component, a one-way conduction unit and a low-voltage power supply end;

the low-voltage power supply end is used for providing a second voltage;

the first contact is electrically connected with the power module, the second contact is grounded, the first contact is electrically connected with the cathode of the unidirectional conduction unit, the anode of the unidirectional conduction unit is electrically connected with one end of the resistance component, and the other end of the resistance component is electrically connected with the low-voltage power supply end;

the unidirectional conducting unit is used for keeping on when positive voltage is applied to the unidirectional conducting unit and keeping off when negative voltage is applied to the unidirectional conducting unit;

the first connecting end is electrically connected with the cathode of the unidirectional conduction unit and the first contact, the third connecting end is electrically connected with the low-voltage power supply end through the resistor assembly, and the second connecting end is electrically connected with a first grounding end;

2. The ingress detection circuit of claim 1 wherein the resistive component comprises: a first resistive device and a second resistive device;

3. The water inlet detection circuit according to claim 1, wherein the signal output unit includes: a comparator;

the comparator includes: a first input, a second input and an output;

4. The ingress water detection circuit of claim 3, wherein the reference sub-circuit module comprises: a third resistive device and a fourth resistive device;

5. The ingress detection circuit of claim 4 wherein the comparator further comprises: a power supply access end;

the water inlet detection circuit module further comprises: a filter capacitor;

6. The ingress water detection circuit of claim 3, further comprising: a processing module;

the processing module is electrically connected with the signal output unit;

7. The incoming water detection circuit of claim 1, wherein the diverter switch comprises: a field effect transistor, a triode, or a photo isolator.

8. The water inlet detection circuit of claim 7, wherein a gate of the field effect transistor is electrically connected to the first connection terminal, a source of the field effect transistor is electrically connected to the second connection terminal, and a drain of the field effect transistor is electrically connected to the third connection terminal.

9. The ingress water detection circuit of claim 1, further comprising: a power management module;

10. The water inlet detection circuit according to claim 1 or 3, wherein the changeover switch unit includes: an over-value switching subunit;

11. The water ingress detection circuit of claim 1 wherein the diverter switch unit further comprises: a low value switching subunit;

when the switch unit is a low value switching subunit, the breakover voltage is greater than the second voltage;

the low value switching subunit is used for switching on the second connecting end and the third connecting end when the voltage of the first connecting end and the voltage of the third connecting end are not greater than the switching-on voltage;

12. The water inlet detection circuit according to claim 1 or 11, wherein the signal output unit further comprises: the signal output subunit, the fourth connecting end, the fifth connecting end, the sixth connecting end and the signal output end;

13. An underwater apparatus, comprising: an ingress water detection circuit as claimed in any one of claims 1 to 12.