CN211577386U - Multifunctional power supply digital display type detector - Google Patents
Multifunctional power supply digital display type detector Download PDFInfo
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- CN211577386U CN211577386U CN201922214767.5U CN201922214767U CN211577386U CN 211577386 U CN211577386 U CN 211577386U CN 201922214767 U CN201922214767 U CN 201922214767U CN 211577386 U CN211577386 U CN 211577386U
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Abstract
A multifunctional power digital display detector comprises a ground wire, a zero line, a live wire plug, a power connection circuit, a microprocessor control unit, a wiring detection circuit and a display circuit; the power supply circuit is connected with the microprocessor control unit and the power supply input end of the display circuit; the input and output ports of the microprocessor control unit are respectively connected with a wiring detection circuit and a display circuit which are connected with a ground wire, a zero wire and a live wire plug; the ground wire, the zero wire and the live wire on the ground wire, the zero wire and the live wire plug are connected to a wiring detection circuit, in the wiring detection circuit, the live wire is connected to two diode circuits which are connected in parallel and are respectively in a forward direction and a reverse direction, the diode circuits in the forward direction and the reverse direction comprise diodes, resistors and optical couplers which are connected in series, and the diode circuits in the forward direction and the reverse direction are connected with a diode forward end and a diode reverse end of the live wire in a finger mode; the zero line is connected with the forward diode circuit and is simultaneously connected with the output end of the reverse diode circuit connected with the live wire; the diode and the optocoupler of the diode circuit are connected in the same direction.
Description
Technical Field
The utility model relates to a measuring device of illumination and power electricity.
Background
With the development of the times, in the aspects of new floor circuit installation, home decoration and the like, whether circuit construction wiring and power supply wiring are correct or not and whether a leakage protection switch can normally work or not are particularly important for safety-related construction and detection. The multifunctional power supply polarity detector is portable, is simple to operate and is provided with a leakage protection switch detection function, and can quickly detect the safety problem of circuit construction wiring, whether the wiring of a socket power supply ground zero and live wire is correct or not and whether the leakage protection switch can normally operate or not. The multifunctional power supply polarity detector has double insulation and safer performance; the liquid crystal screen is used for directly displaying the measurement result, so that the detection result is clear at a glance, and the identification error of human eyes is avoided.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a multi-functional power digital display formula detector, especially to the power source detection appearance whether connecing of socket is correct, certainly still include whether correct, the earth-zero live wire of socket power wiring is correctly, whether can normal function of earth leakage protection switch.
The technical scheme of the utility model, a multifunctional power digital display detector, including ground wire, zero line, live wire plug, power circuit, microprocessor control unit, wiring detection circuit and display circuit; the power supply circuit is connected with the microprocessor control unit and the power supply input end of the display circuit; the input and output ports of the microprocessor control unit are respectively connected with a wiring detection circuit and a display circuit which are connected with a ground wire, a zero wire and a live wire plug; the ground wire, the zero wire and the live wire on the ground wire, the zero wire and the live wire plug are connected to a wiring detection circuit, in the wiring detection circuit, the live wire is connected to two diode circuits which are connected in parallel and are respectively in a forward direction and a reverse direction, the diode circuits in the forward direction and the reverse direction comprise diodes, resistors and optical couplers which are connected in series, and the diode circuits in the forward direction and the reverse direction are connected with a diode forward end and a diode reverse end of the live wire in a finger mode; the zero line is connected with the forward diode circuit and is simultaneously connected with the output end of the reverse diode circuit connected with the live wire; the diode and the optocoupler of the diode circuit are connected in the same direction.
The detection circuit of the leakage protection switch is characterized in that a live wire is connected with a sampling resistor and is connected with the output of a forward diode circuit connected with a ground wire in series, and a switch is arranged at the series connection position; the short circuit position is connected with a sampling resistor with small resistance (or the current detection device is connected with the microprocessor).
Has the advantages that: the utility model discloses the main functional design of multi-functional power polarity detector embodies following advantage, first of all equipment can measure the mains voltage of socket, even frequency;
the equipment can detect whether the socket is connected correctly, such as correct connection, lack of ground wire, lack of zero line, reverse connection of live zero line and ground wire, reverse connection of live ground wire and lack of ground wire;
thirdly, the device displays the measurement result by adopting a 12864 liquid crystal screen;
the device has the detection function of the leakage protection device, and the leakage current of the ground wire exceeds 35mA through a key, so that whether the leakage protection device is protected or not is judged.
The traditional detector depends on that three light-emitting diodes are bright or not to display results, so that the defect exists, and if the diodes are bad, misjudgment can be caused, and the defect is overcome.
Drawings
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a wiring detection circuit of the present invention;
fig. 3 is the leakage protection wiring detection circuit of the present invention;
fig. 4 is a circuit diagram of the microprocessor SC92F7321 of the present invention;
fig. 5 shows a liquid crystal display circuit according to the present invention.
Detailed Description
The utility model discloses can be intelligent power measurement system's scheme, intelligent power management system design mainly comprises main parts such as power supply circuit, microprocessor the control unit, wiring detection circuit, earth leakage protection device detection circuitry and display circuit, and its system block diagram is shown in fig. 1.
In the wiring detection circuit shown in fig. 2, the wiring detection circuit is composed of a diode and an optocoupler, one diode and the optocoupler are connected into each branch of the live wire L, the ground wire N and the zero wire E, resistors are connected in series to limit current and sample the current, and the current flow direction is judged by conducting the diode of one of the three branches, so that whether the wiring is correct is judged. The wiring detection circuit of the sampling resistor is shown in fig. 2.
In the detection circuit of the leakage protection device in fig. 3, the detection circuit of the leakage protection device is implemented by connecting a switch and a corresponding resistor in series between a live wire L and a zero wire E and a ground wire N on the basis of a wiring detection circuit, the switch controls the connection (short circuit) between the live wire and the ground wire, and the resistor controls the current. As shown in FIG. 5, when the switch is pressed, a sampling resistor (or an ammeter) with a small resistance is connected to the short circuit position between the live wire and the ground wire, and the leakage current of the ground wire instantly exceeds 35mA, the leakage protection device is triggered to protect.
The power circuit comprises a bridge rectifier circuit consisting of diodes and a switching power chip OB 2222. The rectifying circuit rectifies 220V alternating current into direct current, and the rectified direct current passes through a chip OB2222 to output 5V direct current voltage to supply power for the display screen and the microprocessor control unit.
The microprocessing control unit is composed of a Saiyuan single-chip microcomputer SC92F7321, and a minimum system circuit of the single-chip microcomputer SC92F7321 is shown in FIG. 4.
The display circuit adopts a 12864 liquid crystal display screen to display the measurement result, and a specific driving circuit is shown in fig. 5.
The utility model discloses performance and working process introduce: 1. the current circuit voltage can be tested, and a specific numerical value is displayed on the liquid crystal display screen; 2. when the wiring of the detected socket is completely correct, the current voltage value and the wiring correctness are displayed on the liquid crystal display screen; 3. when the detected socket is connected with the zero line, the liquid crystal display screen displays that the zero line is absent; 4. when the detected socket is connected with the lack of the ground wire, the liquid crystal screen displays that the ground wire is lack. 5. When the detected socket is connected with the live wire and the ground wire and is staggered, the situation that the live wire and the ground wire are reversely connected is displayed on the liquid crystal screen. 6. When the connection between the detected socket and the live line and the zero line is staggered, the connection between the live line and the zero line is displayed as reversed on the liquid crystal display; 7. when the detected socket is connected with wrong ground and lacks the ground, the liquid crystal display screen displays that the live wire and the ground wire are connected reversely and lack the ground. 8. When the leakage protection switch is pressed, the leakage protection device can be immediately tripped and cut off the power.
Claims (1)
1. A multifunctional power digital display detector is characterized by comprising a ground wire, a zero line, a live wire plug, a power connection circuit, a microprocessor control unit, a wiring detection circuit and a display circuit; the power supply circuit is connected with the microprocessor control unit and the power supply input end of the display circuit; the input and output ports of the microprocessor control unit are respectively connected with a wiring detection circuit and a display circuit which are connected with a ground wire, a zero wire and a live wire plug; the ground wire, the zero wire and the live wire on the ground wire, the zero wire and the live wire plug are connected to a wiring detection circuit, in the wiring detection circuit, the live wire is connected to two diode circuits which are connected in parallel and are respectively in a forward direction and a reverse direction, the diode circuits in the forward direction and the reverse direction comprise diodes, resistors and optical couplers which are connected in series, and the diode circuits in the forward direction and the reverse direction are connected with a diode forward end and a diode reverse end of the live wire in a finger mode; the zero line is connected with the forward diode circuit and is simultaneously connected with the output end of the reverse diode circuit connected with the live wire; the diode and the optocoupler of the diode circuit are connected in the same direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922214767.5U CN211577386U (en) | 2019-12-11 | 2019-12-11 | Multifunctional power supply digital display type detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922214767.5U CN211577386U (en) | 2019-12-11 | 2019-12-11 | Multifunctional power supply digital display type detector |
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| Publication Number | Publication Date |
|---|---|
| CN211577386U true CN211577386U (en) | 2020-09-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922214767.5U Active CN211577386U (en) | 2019-12-11 | 2019-12-11 | Multifunctional power supply digital display type detector |
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| CN (1) | CN211577386U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112147538A (en) * | 2020-09-27 | 2020-12-29 | 中国长城科技集团股份有限公司 | Equipment poor grounding alarm circuit, poor grounding alarm device and switch device |
-
2019
- 2019-12-11 CN CN201922214767.5U patent/CN211577386U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112147538A (en) * | 2020-09-27 | 2020-12-29 | 中国长城科技集团股份有限公司 | Equipment poor grounding alarm circuit, poor grounding alarm device and switch device |
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