CN210664658U

CN210664658U - Protection architecture of water level detection circuit

Info

Publication number: CN210664658U
Application number: CN201921272272.1U
Authority: CN
Inventors: 何文东
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-08-07
Filing date: 2019-08-07
Publication date: 2020-06-02
Anticipated expiration: 2029-08-07

Abstract

The utility model discloses a protection architecture of water level detection circuit, electric capacity detection module end is connected with resistance R3, install electrostatic protection device ESD-RZ2 between resistance R3 and piezo-resistor RZ1, the coupler under piezo-resistor RZ1 connects, be provided with a set of impedance protection device between water level detection metal electrode and the last coupler connection, when piezo-resistor RZ1 circuit normal operating, piezo-resistor RZ 1's effect is the same with electric capacity, as the matching electric capacity of water level detection circuit, when will carrying out electric strength detection, AC 3000V's voltage adds between L, N and water level detection metal electrode, piezo-resistor RZ1 is below the breakdown voltage value of coupler to coupler lower coupler between L, the voltage clamp between N, protection apparatus circuit does not damage, when the coupler bottom is installed and is exposed metal contact down, piezo-resistor RZ1 sets up a set of more impedance protection device 2 with lower coupler, the safety accidents such as electric shock and the like caused by touching the exposed metal contact are prevented.

Description

Protection architecture of water level detection circuit

Technical Field

The utility model belongs to the technical field of the water level detection circuit, concretely relates to water level detection circuit's protection architecture.

Background

When the liquid heating container is used, the water level needs to be observed constantly, the phenomenon that the service life of the appliance is shortened due to the fact that the liquid level is too low and the appliance is dried, a serious fire disaster occurs to cause life and property loss, or the danger or inconvenience is caused due to the fact that water is excessively added due to too high water level and overflows or boils, but an existing water level detection circuit can cause the damage of the appliance circuit in the production process or when the electrical strength of a national detection mechanism is detected, and therefore a protection structure must be designed to protect the liquid heating container.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a water level detection circuit's protection architecture to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a water level detection circuit's protection architecture, includes that electric capacity detection module, last coupler and resistance R3 state electric capacity detection module end and be connected to resistance R3, be connected with electrostatic protection device ESD-RZ2 between the resistance R3 piezo-resistor RZ1, electric capacity detection module one end and the one side that is located piezo-resistor RZ1 are connected with down coupler, last coupler and water level detection metal electrode and are provided with a set of impedance protector between connecting, and one side of water level detection metal electrode is provided with temperature probe, water level detection metal electrode and temperature probe are located the liquid heating container.

Preferably, an impedance protection circuit is arranged between the water level detection metal electrode and the upper coupler, and the impedance protection circuit is composed of a group of Y capacitor, capacitor CY2 and capacitor CY 1.

Preferably, an exposed metal contact is mounted on the outer side of the lower coupler, and a group of impedance protection devices 2 are connected between the piezoresistor RZ1 and the lower coupler.

Preferably, in the extension structure of the lower coupler, when exposed metal contacts are mounted at the bottom of the lower coupler, the piezoresistor RZ1 is directly connected or connected to the lower coupler at the bottom of the kettle through a group of impedance protection circuits 2 composed of Y capacitors, and the impedance protection device 2 is composed of a capacitor CY3 and a capacitor CY 4.

The utility model discloses a technological effect and advantage: the protection structure of the water level detection circuit comprises a capacitor detection module end connecting resistor R3, an electrostatic protection device ESD-RZ2, a piezoresistor RZ1, a coupler assembly, an impedance protection assembly (a capacitor CY1 and a capacitor CY2), a water level detection metal electrode, a singlechip end detecting charging and discharging time, and comparing the detected charging and discharging time with a standard charging and discharging time range, wherein the piezoresistor RZ1 works in a capacitor state at the moment, the water level detection circuit works normally, when the electric intensity is detected, the voltage of AC3000V is added between L, N and the water level detection metal electrode, the piezoresistor RZ1 clamps the voltage between a lower coupler pair L and N below the breakdown voltage value of the coupler, the circuit of a protection appliance is not damaged, the lower coupler extension structure is provided, when a metal contact is arranged at the bottom of the lower coupler, a group of impedance protection devices 2 is additionally arranged between the resistor RZ1 and the lower coupler, the safety accidents such as electric shock and the like caused by touching the exposed metal contact are prevented.

Drawings

Fig. 1 is a schematic circuit diagram of the protection of the varistor RZ1 of the present invention;

fig. 2 is a schematic diagram of an extended structure of a lower coupler having accessible exposed metal contacts according to the present invention;

fig. 3 is a schematic diagram of the lower coupler extension circuit according to the present invention.

In the figure: 1. a capacitance detection module; 2. a resistor R3; 3. an electrostatic protection device ESD-RZ 2; 4. a voltage dependent resistor RZ 1; 5. a lower coupler; 6. an upper coupler; 7. a temperature probe; 8. a water level detection metal electrode; 9. an impedance protection circuit; 10. exposing the metal contact; 11. an impedance protection device 2.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The utility model provides a protection architecture of water level detection circuit as shown in figure 1, including water level detection circuit subassembly, last coupler and protection component piezo-resistor RZ1, the circuit includes but is not limited to following: the water level detection kettle comprises a capacitance detection module 1, a resistor R32, a piezoresistor RZ14, an electrostatic protector ESD-RZ23, one or more groups of impedance protection circuits 9 consisting of Y capacitors and a water level detection metal electrode 8, wherein the end of the capacitance detection module 1 is connected with the resistor R32, an electrostatic protection device ESD-RZ23 is connected between the resistor R32 and the piezoresistor RZ14, the electrostatic protector ESD-RZ23 can be selectively installed according to requirements, the lower coupler 5 is of an extension structure, when an exposed metal contact 10 is installed at the bottom of the lower coupler 5, the piezoresistor RZ14 is directly connected or connected with the lower coupler 5 at the bottom of the kettle through the group of impedance protection circuits 9 consisting of the Y capacitors, so as to prevent the occurrence of safety accidents such as electric shock and the like caused by touching the exposed metal contact 10, an upper coupler 6 of the kettle is connected to the water level detection metal electrode 8 through the group of impedance protection circuits 9 consisting of the Y, and a temperature probe 7 is arranged on one side of the water level detection metal electrode 8, and the water level detection metal electrode 10 and the temperature probe 7 are positioned in the liquid heating container.

Specifically, an impedance protection circuit 9 is arranged between the water level detection metal electrode 8 and the upper coupler 6, and the impedance protection circuit 9 is composed of a group of Y capacitor, a capacitor CY2 and a capacitor CY 1.

Specifically, an exposed metal contact 10 is installed on the outer side of the lower coupler 5, and a group of impedance protection devices 211 is connected between the piezoresistor RZ14 and the lower coupler.

Specifically, when the bottom of the lower coupler 5 is provided with the exposed metal contact 10, the piezoresistor RZ14 is directly connected or connected with the lower coupler 5 at the bottom of the kettle through a group of impedance protection circuits 211 composed of Y capacitors, and the impedance protection devices 211 are composed of a capacitor CY3 and a capacitor CY 4.

According to the protection structure of the water level detection circuit, a capacitor detection module 1 end is connected with a resistor R32, an electrostatic protection device ESD-RZ23, a piezoresistor RZ14, a coupler assembly (5, 6), an impedance protection assembly CY1, a resistor CY2 and a water level detection metal electrode 8, a singlechip end detects charging and discharging time, the detected charging and discharging time is compared with a standard charging and discharging time range to judge the water level condition in a kettle, the piezoresistor RZ14 works in a capacitor state at the moment, when electrical strength detection is needed, the voltage of AC3000V is added between L and N and the water level detection metal electrode 8, the piezoresistor RZ1 clamps the voltage between the lower coupler pair L and N below the breakdown voltage value of the coupler, and the circuit of an appliance is protected from being damaged.

The utility model provides a as shown in fig. 2 and 3, coupler 5 extends the structure down, and when exposing metal contact 10 was installed to coupler 5 bottom down, piezo-resistor RZ14 lug connection perhaps connected the lower coupler 5 of kettle bottom through a set of impedance protection circuit 211 that comprises Y electric capacity, prevented to touch and expose metal contact 10 and take place incident such as electric shock.

According to the protection structure of the water level detection circuit, the end of a capacitor detection module 1 is connected with a resistor R2, an electrostatic protection device 3, a piezoresistor 4, a coupler assembly, a capacitor CY2, a capacitor CY1 and a water level detection metal electrode 8, the charge-discharge time is detected by a single chip microcomputer end, the detected charge-discharge time is compared with a standard charge-discharge time range, the capacitor state of the piezoresistor 4 works at the moment, when exposed metal can be touched and exposed on the water level detection metal electrode 8, when high-voltage connection occurs or static electricity is generated, the piezoresistor 4 can be changed into a clamping effect, so that the coupler or related circuits cannot be ignited, and the electrostatic protection device ESD-RZ23 absorbs the effect of the protection circuit.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.

Claims

1. A protection structure of a water level detection circuit comprises a capacitance detection module (1), an upper coupler (6) and a resistor R3(2), and is characterized in that: capacitance detection module (1) end connection has resistance R3(2), be connected with electrostatic protection device ESD-RZ2(3) between resistance R3(2) and piezo-resistor RZ1(4), capacitance detection module (1) one end and the one side that is located piezo-resistor RZ1(4) are connected with down coupler (5), go up coupler (6) and be connected to water level detection metal electrode (8) through a set of impedance protection circuit (9) of constituteing by Y electric capacity, and one side of water level detection metal electrode (8) is provided with temperature probe (7), water level detection metal electrode (8) are arranged in the liquid heating container with temperature probe (7).

2. The protection structure of a water level detection circuit according to claim 1, wherein: an impedance protection circuit (9) is arranged between the water level detection metal electrode (8) and the upper coupler (6), and the impedance protection circuit (9) is composed of a group of Y capacitor, a capacitor CY2 and a capacitor CY 1.

3. The protection structure of a water level detection circuit according to claim 1, wherein: an exposed metal contact (10) is arranged on the outer side of the lower coupler (5), and a group of impedance protection devices 2(11) are connected between the piezoresistor RZ1(4) and the lower coupler.

4. The protection structure of a water level detection circuit according to claim 1, wherein: the extension structure of the lower coupler (5) is characterized in that when an exposed metal contact (10) is installed at the bottom of the lower coupler (5), a piezoresistor RZ1(4) is directly connected or connected with the lower coupler (5) at the bottom of the kettle through a group of impedance protection devices 2(11) consisting of Y capacitors, and the impedance protection devices 2(11) consist of capacitors CY3 and capacitors CY 4.