CN212085800U - Electric leakage protector based on single chip microcomputer - Google Patents
Electric leakage protector based on single chip microcomputer Download PDFInfo
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- CN212085800U CN212085800U CN202020344889.6U CN202020344889U CN212085800U CN 212085800 U CN212085800 U CN 212085800U CN 202020344889 U CN202020344889 U CN 202020344889U CN 212085800 U CN212085800 U CN 212085800U
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Abstract
The utility model discloses a leakage protector based on a single chip microcomputer, which relates to the field of electrical safety and comprises an action module, wherein the action module is used for disconnecting or connecting a zero line and a live line of a load; the single chip microcomputer is used for controlling the action module to switch off or switch on the zero line and the live line of the load; the leakage detection module is used for detecting whether the live wire and the zero line leak electricity or not, and when the leakage is detected, the leakage detection module sends out a leakage analog signal; the reference power supply module is used for increasing the reference voltage value of the electric leakage analog signal; the single chip microcomputer is also used for receiving the electric leakage analog signal, and after the single chip microcomputer receives the electric leakage analog signal, the single chip microcomputer controls the action module to disconnect the zero line and the live line of the load; compared with the prior art, the leakage protection chip is replaced by the single chip microcomputer, so that the leakage protector does not need to use a customized leakage protection chip, and the cost is reduced.
Description
Technical Field
The utility model relates to a earth-leakage protector technical field especially relates to an earth-leakage protector based on singlechip.
Background
Along with the improvement of living standard, the popularization rate of household water heaters is higher and higher, and the electric shock event of using the water heaters is also rare, so that the water heaters need a leakage protector to protect the safety of users, and the existing leakage protectors all rely on special leakage protection chips.
The leakage protection device with ground wire live protection disclosed in CN3178492A of china includes three poles of phase line L, zero line N and ground line E with switches, zero sequence current transformers passing through the phase line L and the zero line N, test circuits, releases, rectification circuits, power supply step-down and silicon controlled rectifiers, a current detector and a dual input end amplifier, wherein one end of a primary coil of the current detector is connected with the ground line E, the other end of the primary coil of the current detector is connected with the zero line N after being connected in series with a large resistance current limiting step-down circuit, a secondary coil of the current detector is connected with one input end of the dual input end amplifier, two output ends of the dual input end amplifier are respectively connected with trigger electrodes of the two silicon controlled rectifiers, and the output end of the zero sequence current transformer is connected with the other input end of the dual input end amplifier; the utility model discloses a though can detect zero line, live wire and ground wire simultaneously whether electric leakage, this utility model relies on the special chip of hourglass guarantor, and earth-leakage protector can only be applied to this kind of chip, and consequently the producer needs this chip of customization, has improved manufacturing cost to this chip specificity is strong, and earth-leakage protector develops other functions and can receive the restriction of this chip performance.
SUMMERY OF THE UTILITY MODEL
First, technical problem to be solved
Aiming at the defects in the prior art, the existing leakage protector depends on a special leakage protection chip.
Second, technical scheme
In order to solve the above problems, there is provided a leakage protector based on a single chip microcomputer, comprising:
the action module is used for switching off or switching on a zero line and a live line of a load;
the single chip microcomputer is used for controlling the action module to switch off or switch on the zero line and the live line of the load;
the leakage detection module is used for detecting whether the live wire and the zero line leak electricity or not, and when the leakage is detected, the leakage detection module sends out a leakage analog signal;
the reference power supply module is used for increasing the reference voltage value of the electric leakage analog signal;
the single chip microcomputer is also used for receiving the electric leakage analog signal, and after the single chip microcomputer receives the electric leakage analog signal, the single chip microcomputer controls the action module to disconnect the zero line and the live line of the load.
The leakage protector further comprises a power supply module, the power supply module is electrically connected with the mains supply, and the power supply module is used for providing working voltage for other modules.
The single chip microcomputer converts the analog signal into a digital signal after receiving the electric leakage analog signal.
The singlechip comprises an analog/digital converter, and the analog/digital converter is used for converting an analog signal into a digital signal.
The reference power supply module comprises a three-terminal adjustable shunt reference source TL 431.
The reference power supply module raises the reference voltage value of the leakage analog signal to be greater than or equal to 1.5V and less than or equal to 36V.
The single chip microcomputer receives the electric leakage analog signal, the analog/digital converter converts the electric leakage analog signal into a digital signal, then the single chip microcomputer compares an electric leakage voltage value detected by the electric leakage detection module with a preset value, and when the electric leakage voltage value is larger than the preset value, the single chip microcomputer controls the action module to disconnect a loaded zero line and a loaded live line.
The leakage detection module is also used for detecting whether the ground wire leaks electricity, and when the leakage of the zero line, the live wire or the ground wire is detected, the leakage detection module sends out a leakage analog signal.
The action module is also used for switching off or switching on a ground wire of the load.
Thirdly, the beneficial effects of the utility model
Compared with the prior art, the leakage protector has the advantages that the single chip microcomputer is used for replacing the leakage protector chip, so that the leakage protector does not need to use a customized leakage protector chip, and the cost is reduced;
and the reference voltage is increased to 2.5V through the TL431, so that an analog signal can be directly input into an analog/digital converter of the singlechip, and the cost of additionally constructing the analog/digital converter is saved.
Drawings
FIG. 1 is a diagram of the connection relationship of the main modules of an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of an action module of an embodiment of the invention;
fig. 3 is a schematic circuit diagram of the single chip microcomputer according to the embodiment of the present invention;
fig. 4 is a circuit schematic of a power module of an embodiment of the invention;
fig. 5 is a schematic circuit diagram of a reference power supply module and a leakage detection module according to an embodiment of the present invention;
fig. 6 is a schematic diagram of an electrical leakage simulation signal according to an embodiment of the present invention 1;
fig. 7 is a schematic diagram of the leakage analog signal according to the embodiment of the present invention 2.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
As shown in fig. 1 to 5, after power is turned on, the power supply module provides working voltages for the action module, the leakage detection module, the reference power supply module and the single chip microcomputer U2.
In this embodiment, the model of the single chip microcomputer U2 is JR103, an analog/digital converter is disposed in the single chip microcomputer U2, and the analog/digital converter can only be used for converting an analog signal with a positive voltage, and if an analog signal with a negative voltage is accessed, there is a risk of damage.
When the mutual inductor ZCT1 or the mutual inductor ZCT2 detects electric leakage, the single chip microcomputer U2 receives an analog signal of electric leakage voltage, namely an electric leakage analog signal, through the sampling resistor R35 and the sampling resistor R36;
as shown in fig. 6, in the case of not raising the voltage value of the reference voltage, the leakage analog signal includes a negative voltage, so that the analog/digital converter in the single chip microcomputer U2 cannot normally operate.
As shown in fig. 7, the reference power supply module raises the reference voltage value of the leakage analog signal from 0V to 2.5V, so that the analog signal does not include a negative voltage;
the reference power supply module comprises a three-terminal adjustable shunt reference source U3 and a capacitor C17, in the implementation, the model of the three-terminal adjustable shunt reference source U3 is TL431, and a person skilled in the art can adjust the reference voltage value of the leakage analog signal to be between 1.5 and 36V according to actual requirements, wherein 2.5V is taken as an example in the embodiment.
After the single chip microcomputer U2 receives the leakage analog signal, the analog/digital converter converts the leakage analog signal into a digital signal, then the single chip microcomputer U2 compares the leakage voltage value detected by the mutual inductor ZCT1 or the mutual inductor ZCT2 with a preset value, and when the leakage voltage value is larger than the preset value, the single chip microcomputer U2 controls the trip coil RL2 to cut off the zero line and the live line of the water heater.
The single chip microcomputer is used for replacing the leakage protection chip, so that the leakage protector does not need to use a customized leakage protection chip, and the cost is reduced;
and the reference voltage is increased to 2.5V through the TL431, so that an analog signal can be directly input into an analog/digital converter of the singlechip, and the cost of additionally constructing the analog/digital converter is saved.
The above embodiments are only used for illustrating the present invention, and not for limiting the present invention, and those skilled in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention, so that all equivalent technical solutions also belong to the scope of the present invention, and the protection scope of the present invention should be defined by the claims.
Claims (9)
1. A earth-leakage protector based on singlechip, its characterized in that, earth-leakage protector includes:
the action module is used for switching off or switching on a zero line and a live line of a load;
the single chip microcomputer is used for controlling the action module to switch off or switch on a zero line and a live line of a load;
the leakage detection module is used for detecting whether the live wire and the zero wire leak electricity or not, and when the leakage is detected, the leakage detection module sends out a leakage analog signal;
the reference power supply module is used for improving a reference voltage value of the electric leakage analog signal;
the single chip microcomputer is also used for receiving the electric leakage analog signal, and after the single chip microcomputer receives the electric leakage analog signal, the single chip microcomputer controls the action module to disconnect the zero line and the live line of the load.
2. A earth-leakage protector based on a single-chip microcomputer as claimed in claim 1, wherein said earth-leakage protector further comprises a power module, said power module is electrically connected to the mains, said power module is used for providing working voltage for other modules.
3. A earth-leakage protector based on a single-chip microcomputer as claimed in claim 1, wherein said single-chip microcomputer converts the analog signal into a digital signal after receiving the analog signal of the earth leakage.
4. A earth-leakage protector based on a single-chip microcomputer as claimed in claim 3, wherein said single-chip microcomputer includes an analog/digital converter for converting analog signals into digital signals.
5. A earth-leakage protector based on a single-chip microcomputer as claimed in claim 1, wherein said reference power supply module comprises a three-terminal adjustable shunt reference source TL 431.
6. A earth-leakage protector based on a single-chip microcomputer as claimed in claim 1, wherein said reference power module raises the reference voltage value of the leakage analog signal to 1.5V or more and 36V or less.
7. The earth leakage protector based on the single chip microcomputer according to claim 4, wherein the analog/digital converter converts the analog signal of the earth leakage into a digital signal after the single chip microcomputer receives the analog signal of the earth leakage, then the single chip microcomputer compares the voltage value of the earth leakage detected by the earth leakage detecting module with a preset value, and when the voltage value of the earth leakage is greater than the preset value, the single chip microcomputer controls the action module to disconnect the zero line and the live line of the load.
8. A earth leakage protector based on a single chip microcomputer according to claim 1, characterized in that said earth leakage detection module is further used for detecting whether earth leakage occurs, and when earth leakage occurs in the zero line, the live line or the earth, said earth leakage detection module sends out an earth leakage analog signal.
9. A earth-leakage protector based on a single-chip microcomputer as claimed in claim 1 or 8, wherein said action module is further used to disconnect or connect the ground wire of the load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020344889.6U CN212085800U (en) | 2020-03-18 | 2020-03-18 | Electric leakage protector based on single chip microcomputer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020344889.6U CN212085800U (en) | 2020-03-18 | 2020-03-18 | Electric leakage protector based on single chip microcomputer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212085800U true CN212085800U (en) | 2020-12-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020344889.6U Active CN212085800U (en) | 2020-03-18 | 2020-03-18 | Electric leakage protector based on single chip microcomputer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212085800U (en) |
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2020
- 2020-03-18 CN CN202020344889.6U patent/CN212085800U/en active Active
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