WO2023004623A1

WO2023004623A1 - Electrical circuit line quality detection apparatus

Info

Publication number: WO2023004623A1
Application number: PCT/CN2021/108912
Authority: WO
Inventors: 郑秋豪; 吴典舆
Original assignee: 孕龙科技股份有限公司
Priority date: 2021-07-28
Filing date: 2021-07-28
Publication date: 2023-02-02

Abstract

An electrical circuit line quality detection apparatus, comprising two electrical connectors, a load resistor, a switch element, a display module and a control module, wherein the two electrical connectors are inserted into a jack and connected to two power lines; one end of the load resistor is connected to an electrical connector, and the other end is connected to a first end of the switch element; a second end of the switch element is connected to the other electrical connector; the control module is in a detection mode, controls the switch element to turn off, detects peak voltage in a voltage waveform and records same as a maximum open circuit voltage, then controls the switch element to turn on, detects peak voltage in the voltage waveform and records same as a load voltage, and calculates a load current; and according to the maximum open circuit voltage, the load voltage and the load current, a line resistance value is calculated, and a corresponding message is displayed by means of the display module.

Description

Electric circuit line quality detection device

technical field

The invention is related to the aging detection of power lines; in particular, it refers to a detection device for the quality of electric circuit lines.

Background technique

Generally, power wiring is to connect one end of two power lines to an AC power supply, and connect the other end of the two power lines to a socket, and the power of the AC power supply is conducted to the socket through the two power lines. When the user inserts the plug of the electric device into the socket, the power of the AC power supply can be supplied to the electric device to make the electric device operate.

Although the power line can conduct electricity, since the power line is not an ideal conductor, there is still line resistance. Therefore, when the current of the AC power supply flows through the power line, the power line will generate heat due to the line resistance. The higher the resistance of the power line or the higher the current flowing through the power line, the more heat energy will be generated by the current passing through. Therefore, after the power line has been used for a certain number of years, it will be heated and cooled repeatedly, which will cause the power line to age and increase the line resistance. After the line resistance increases, more heat will be generated, which will accelerate the aging of the power line.

However, general users cannot know the aging state of the power line, and can only judge whether to replace the power line according to the time when the power line is installed and the normal power consumption situation. In this way, if the power line is old enough to be unusable before being replaced, the high temperature generated by the power line may ignite surrounding objects and may cause a fire.

The resistance of a good power line is usually below 1 ohm. Even the electrical resistance of an aging and unusable power line is only a few ohms. The general electric meter cannot measure it accurately, and the impedance sold on the market is used to measure low resistance. The analyzer is not only expensive, but also bulky and inconvenient to carry, and it is not easy to apply to the impedance detection of the power line in the home. Therefore, how to effectively and conveniently detect the line quality of the power circuit at home is a difficult problem to be solved urgently.

Contents of the invention

In view of this, the object of the present invention is to provide an electrical circuit line quality detection device, which can detect the quality of the power line, and is easy to use and portable.

In order to achieve the above object, the present invention provides an electrical circuit line quality detection device, which is used to connect a socket, and the socket is connected to two power lines, and the two power lines are connected to an AC power supply, and the wires The quality detection device includes: two electrical connectors, a load resistor, a switch element, a display module and a control module, wherein the two electrical connectors are connected to the socket to receive power through the two power lines The alternating current of the alternating current power supply; one end of the load resistor is electrically connected to one of the two electrical connectors; the switching element has a first end and a second end, and the first end is electrically connected to The other end of the load resistor, the second end is electrically connected to the other of the two electrical connectors; the control module is electrically connected to both ends of the load resistor, the switch element and the The display module is used to perform a detection mode. In the detection mode, the control module controls the switch element to be cut off, and detects a peak voltage in a half wave of a voltage waveform of the alternating current and records it as a maximum open circuit voltage, and then control the switch element to conduct, and detect the peak voltage in the voltage waveform and record it as a load voltage, and calculate a load current flowing through the load resistance; the control module according to the The maximum open circuit voltage, the load voltage and the load current calculate a line resistance value of the socket and the two power lines, and display a message corresponding to the line resistance value through the display module.

The effect of the present invention is that the electrical circuit line quality detection device can accurately measure the circuit resistance of the overall circuit of the socket and the power line, and provide corresponding information on the display module, so that the user can know the current line quality of the overall circuit , so as to assess the need for receptacle or power line replacement.

Description of drawings

FIG. 1 is a schematic diagram of an electrical circuit line quality detection device according to a first preferred embodiment of the present invention.

Fig. 2 is a voltage waveform diagram of the above-mentioned preferred embodiment.

FIG. 3 is a schematic diagram of an electrical circuit line quality detection device according to a second preferred embodiment of the present invention.

FIG. 4 is a schematic diagram of an electrical circuit line quality detection device according to a third preferred embodiment of the present invention.

Detailed ways

In order to illustrate the present invention more clearly, preferred embodiments are given and described in detail with accompanying drawings as follows. Please refer to Fig. 1, which is an electric circuit line quality detection device 1 according to the first preferred embodiment of the present invention, comprising a casing 10 and two electrical connectors 12, a load resistor 14, and a load resistor 14 arranged in the casing. The switch element 16 , a display module 18 and a control module 20 .

The two electrical connectors 12 are used to be inserted into a socket 100, and the socket 100 is electrically connected to two power lines 200, and the two power lines 200 are connected to an AC power supply 300, and the AC power of the AC power supply 300 is The voltage can be 100-240V.

The load resistor 14 has two ends, one end of which is electrically connected to one of the two electrical connectors 12 . The load resistor 14 is a power resistor, and the resistance value is 10 ohms as an example, and the resistance value is preferably no more than 10 ohms.

The switching element 16 is a power transistor in this embodiment, and the power transistor can be a MOSFET or a BJT. In one embodiment, the switching element 16 can also be a relay. The switch element 16 has a first end 162 and a second end 164 , and the switch element 16 can be controlled to turn off or conduct between the first end 162 and the second end 164 . The first end 162 is electrically connected to the other end of the load resistor 14 , and the second end 164 is electrically connected to the other of the two electrical connectors 12 .

In this embodiment, the electrical circuit line quality detection device 1 further includes a rectification module 22, the rectification module 22 is a full-wave rectification module and is electrically connected to the two electrical connectors 12 and the load resistor 14 Between, the full-wave rectification module can be, for example, a bridge rectifier. One end of the load resistor 14 is electrically connected to one of the two electrical connectors 12 through the rectifier module 22, and the second end 164 of the switching element 16 is electrically connected to the The other of the two electrical connectors 12 .

The display module 18 is used to display the detection status. In this embodiment, the display module 18 includes a plurality of LED elements, taking eight LED elements as an example, and each LED element has LEDs of two light colors, such as red and green.

The control module 20 is electrically connected to both ends of the load resistor 14, the switch element 16 and the display module 18. In more detail, the control module 20 is a microcontroller with at least two For the analog-to-digital converter, in practice, the control module 20 can also be a structure in which the microcontroller and the analog-to-digital converter are separated. The control module 20 is electrically connected to both ends of the load resistor 14 through two

voltage divider circuits

24 and 26 respectively. The two

voltage dividing circuits

24 , 26 are used to respectively step down the voltages at both ends of the load resistor 14 (ie nodes N1 , N2 ) and input them to the two analog-to-digital converters in the control module 20 . For example, if the voltage dividing ratio set by the two

voltage dividing circuits

24 and 26 is 100 to 1, and the above ratio will be written into the control module 20 in advance. Therefore, when the voltages received by the two analog-to-digital converters in the control module 20 are 1.1V and 0.01V, it means that the voltages on the nodes N1 and N2 are 110V and 1V. Certainly, in practice, the voltage dividing ratio of the two

voltage dividing circuits

24 and 26 can still be set according to different usage environments, and is not limited by the above ratio. The resistance value of the load resistor 14 is stored in the control module 20 . The power source of the control module 20 is from a power supply module 28 , and the power supply module 28 is electrically connected to the two electrical connectors 12 to convert the AC power to the DC power required by the control module 20 .

The control module 20 is used to perform a detection mode, and the steps performed in the detection mode are as follows:

Step 1: the control module 20 controls the switching element 16 to be cut off, and detects a peak voltage in a voltage waveform and records it as a maximum open circuit voltage V _OC (refer to FIG. 2 ). In this embodiment, the control module 20 continuously obtain the change of the voltage waveform from the node N1, detect the frequency or cycle of the voltage waveform, and record the peak voltage of the voltage waveform as the maximum open circuit voltage V _OC . Since the voltage dividing ratio of the voltage dividing circuit 24 is known, the control module 20 can obtain the maximum open-circuit voltage V _OC by calculating according to the voltage input to the analog-to-digital converter.

Step 2: The control module 20 controls the switching element 16 to conduct, and detects the peak voltage in the voltage waveform and records it as a load voltage V _L (refer to FIG. 2 ), the load voltage V _L is less than the specified The stated maximum open circuit voltage V _OC . In this embodiment, the control module 20 controls the switching element 16 to conduct for an on-time T _on according to the measured frequency or cycle, and detects the peak voltage in the voltage waveform during the on-time And record as the load voltage. When the switching element 16 is turned on, the control module 20 respectively obtains the changes of the voltage waveforms from the nodes N1 and N2, and at the peak voltage in the voltage waveforms, the voltage drop between the nodes N1 and N2 (that is, the voltage difference) is the load voltage V _L . Since the voltage dividing ratio of the voltage dividing circuit 26 is known, the control module 20 can obtain the load voltage V _L by calculating according to the voltage input to the analog-to-digital converter.

Preferably, the control module 20 in step 2 controls the switching element 16 to be turned on within a half-wave period after the peak voltage of the voltage waveform is detected in step 1. , and the on-time T _on preferably does not exceed a half-wave period of the voltage waveform. In other words, the load voltage V _L can be obtained at the peak voltage of the next half-wave after the maximum open-circuit voltage V _OC is obtained, thereby speeding up the detection speed. The on-time T _on does not exceed a half-wave cycle of the voltage waveform, which can prevent the temperature of the load resistor 14 from being too high. It can be set to conduct at more than 0.8 times the peak voltage of the voltage waveform.

Step 3: Since the resistance value of the load resistor 14 is known, the control module 20 can calculate a load current flowing through the load resistor 14, and the load current is equal to the load voltage V _L divided by the load resistor 14 resistance. The control module 20 then calculates a line resistance value between the socket 100 and the two power lines 200 according to the maximum open circuit voltage V _OC , the load voltage V _L and the load current. The calculation formula of the line resistance value is as follows:

r=(V _OC -V _L )/I _L

Among them, r is the line resistance value, V _OC is the maximum open circuit voltage, V _L is the load voltage, _IL is the load current.

Step 4: The control module 20 displays a message corresponding to the line resistance value through the display module 18 . In this embodiment, the control module 20 compares the resistance value of the line with a plurality of preset resistance value ranges to determine the resistance value range to which the resistance value of the line belongs, and selects the resistance value range according to the resistance value range. The corresponding message is displayed on the display module 18 . For example, as shown in Table 1 below, the control module 20 forms the message according to the number of segments to which the circuit resistance value belongs, and correspondingly controls the number and color of LED elements to be lit. The first and second paragraphs represent abnormal, the third to fifth paragraphs represent normal but inspection is recommended, and the sixth to eighth paragraphs represent good.

Table I

In one embodiment, the display module 18 can also be a display panel, and the control module 20 can display the detection status through the display panel, such as displaying the circuit resistance value, displaying the maximum open circuit voltage V _OC , and corresponding to the above-mentioned different resistance values One of the ranges displays corresponding text or images to form the message for prompting to let the user know the quality of the power line, for example, the displayed text can be "good", "normal", and "abnormal".

In addition, in this embodiment, the electrical circuit line quality detection device 1 further includes two

temperature sensors

30, 32, the two

temperature sensors

30, 32 are electrically connected to the control module 20, and one of the temperature sensors A sensor 30 detects the temperature of the load resistor 14, and another temperature sensor 32 detects the temperature of the rectifier module 22. During the detection mode, the control module 20 When the temperature of the load resistor 14 or the temperature of the rectifier module 22 is greater than a predetermined temperature, the switching element 16 is controlled to be turned off, so as to stop detecting the load voltage VL and the line resistance. The predetermined temperature may be set to be above 50-60 degrees. In addition, since the resistance value of the load resistor 14 will change slightly due to temperature changes, after the temperature sensor 30 detects the temperature of the load resistor 14, the control module 20 can use the measured temperature to adjust the stored The resistance value of the load resistor 14 is finely adjusted, and then the load current flowing through the load resistor 14 is corrected, so that the calculation of the line resistance value can be more accurate.

In addition, in this embodiment, when the control module 20 is in the detection mode, it first detects whether the voltage and frequency of the alternating current are within a normal voltage range (90 volts to 250 volts) and a normal frequency In the value interval (47 Hz ~ 63 Hz), if it is within the normal voltage value range and the normal frequency value range, then the subsequent detection and calculation of the line resistance value will be performed; otherwise, if it exceeds the normal voltage value Value interval or the normal frequency value interval, then stop detecting and calculating the line resistance value, and display a message corresponding to abnormal voltage or abnormal frequency through the display module (such as the first to eighth LEDs are all red lights or orange light and flashing).

The detection mode of this embodiment can be performed once after the power is turned on, and then the control module automatically performs a detection mode every predetermined time (eg, 30 days). Alternatively, the electrical circuit line quality detection device 1 also includes a manual start switch 34, which is electrically connected to the control module 20, and the user presses the start switch 34 to activate the start switch 34, and the control module 20 performing the detection mode. Before performing the detection mode, the control module 20 does not perform the detection mode if the temperature of any one of the temperature sensors is greater than the predetermined temperature.

The electrical circuit quality detection device 1 can also include a wireless communication module 36 , the wireless communication module 36 is electrically connected to the control module 20 , and the control module 20 can communicate with an external electronic device through the wireless communication module 36 . The control module 20 sends a line message to the electronic device through the wireless communication module 36, the line message includes at least the line resistance value, and may also include the maximum open circuit voltage, the line resistance value to which range of resistance values.

Figure 3 shows the electrical circuit line quality detection device 2 of the second preferred embodiment of the present invention, which has roughly the same structure as that of the first embodiment, the difference is that the rectification module 38 of this embodiment is a half-wave rectification module The rectifier module 38 is electrically connected between one of the electrical connectors 12 and the load resistor 14, and the half-wave rectifier module can be, for example, a rectifier diode. One end of the load resistor 14 is electrically connected to one of the two electrical connectors 12 through the rectifier module 22 , and the second end of the switching element 16 is directly electrically connected to the two electrical connectors 12 another of the .

Figure 4 shows the electrical circuit line quality detection device 3 of the third preferred embodiment of the present invention, which has a structure substantially the same as that of the first embodiment, except that the rectification module 22 is not provided, and the load resistor 14 One end is electrically connected to one of the two electrical connectors 12 , and the second end 164 of the switch element 16 is directly electrically connected to the other of the two electrical connectors 12 . The control module 20 of this embodiment can also detect the change of the voltage waveform. Preferably, the peak voltage of the positive half wave is used as the maximum open circuit voltage V _OC or the load voltage V _L .

According to the above, the electrical circuit line quality detection device of the present invention can not only accurately measure the line resistance of the overall circuit of the socket and the power line, but also provide corresponding information, and is small in size and easy to carry, and only needs to be plugged into the socket The line resistance of the circuit loop corresponding to the socket can be detected, so that the user can conveniently and quickly know the quality of the current power line.

The above descriptions are only preferred feasible embodiments of the present invention, and all equivalent changes made by applying the description of the present invention and the scope of the patent application should be included in the scope of the patent of the present invention.

Explanation of reference signs

[this invention]

1: Electric circuit line quality detection device

10: shell

12: Electrical connector

14: Load resistance

16: Switching element

162: first end

164: second end

18: Display module

20: Control module

22: rectifier module

24: Voltage divider circuit

26: Voltage divider circuit

28: Power supply module

30: Temperature sensor

32: Temperature sensor

34: Start switch

36: Wireless communication module

2: Electric circuit line quality detection device

38: rectifier module

3: Electric circuit line quality detection device

100: socket

200: Powerline

300: AC power

N1, N2: nodes

T _on : On time

V _OC : Maximum open circuit voltage

V _L : load voltage

Claims

An electric circuit line quality detection device is used to connect a socket, and the socket is connected to two power lines, and the two power lines are connected to an AC power supply, the wire quality detection device includes:

Two electrical connectors are respectively used to connect to the socket, so as to receive the AC power of the AC power supply through the two power lines;

A load resistor, one end of which is electrically connected to one of the two electrical connectors, wherein the load resistor is a power resistor;

A switch element, having a first end and a second end, the first end is electrically connected to the other end of the load resistor, and the second end is electrically connected to the other of the two electrical connectors ;

a display module;

A control module, electrically connected to both ends of the load resistor, the switching element and the display module, for performing a detection mode, in the detection mode, the control module controls the switching element Cut off, and detect the peak voltage in the half wave of a voltage waveform of the alternating current and record it as a maximum open circuit voltage, then control the switch element to conduct, and detect the peak voltage in the voltage waveform and record it as a load voltage, and calculate a load current flowing through the load resistance; the control module calculates a line resistance between the socket and the two power lines according to the maximum open circuit voltage, the load voltage and the load current value, and display a message corresponding to the line resistance value through the display module.
The electrical circuit quality detection device according to claim 1, wherein a rectification module is electrically connected between one of the two electrical connectors and the load resistor, and the rectification module converts the AC The alternating current of the power supply is converted into direct current, and one end of the load resistor is electrically connected to one of the two electrical connectors through the rectification module.
The electrical circuit quality detection device according to claim 2, wherein the rectification module is a full-wave rectification module.
The electrical circuit line quality detection device according to claim 2, wherein the rectification module is a half-wave rectification module.
The electrical circuit line quality detection device according to claim 1, wherein the control module includes detecting the frequency or cycle of the voltage waveform when the switching element is turned off, and after obtaining the maximum open circuit voltage and controlling the switching element to be turned on for a conduction time according to the measured frequency or period, and detecting a peak voltage in the voltage waveform during the conduction time and recording it as the load voltage.
The electrical circuit line quality detection device according to claim 5, wherein, when the switching element is turned off, the control module controls the The switching element is turned on.
The device for detecting the quality of an electrical circuit as claimed in claim 5, wherein the conduction time does not exceed one half-wave cycle of the voltage waveform.
The electrical circuit line quality detection device according to claim 1, wherein it comprises a temperature sensor electrically connected to the control module, the temperature sensor detects the temperature of the load resistor, and the control When the temperature of the load resistor is greater than a predetermined temperature, the module controls the switching element to cut off.
The electrical circuit line quality detection device according to claim 2, wherein it comprises a temperature sensor electrically connected to the control module, the temperature sensor detects the temperature of the rectifier module, and the control When the temperature of the rectification module is greater than a predetermined temperature, the module controls the switch element to be cut off.
The electrical circuit quality detection device according to claim 1 , further comprising an activation switch electrically connected to the control module, and after the activation switch is activated, the control module performs the detection mode.
The electrical circuit quality detection device according to claim 1, wherein the control module performs the detection mode every predetermined time.
The electrical circuit line quality detection device according to claim 1, wherein the control module compares the line resistance value with a plurality of resistance value ranges to determine the resistance value range to which the line resistance value belongs, and The corresponding information is displayed on the display module according to the resistance value range.
The electrical circuit line quality detection device according to claim 1, wherein it comprises a wireless communication module electrically connected to the control module, and the control module sends a line message through the wireless communication module, the line message tool includes the line resistance value.
The electrical circuit line quality detection device according to claim 1, wherein, comprising a temperature sensor, electrically connected to the control module, the temperature sensor detects the temperature of the load resistance; the control The module stores the resistance value of the load resistor, and the control module adjusts the stored resistance value of the load resistor according to the temperature measured by the temperature sensor, and uses the adjusted resistance value of the load resistor The load current flowing through the load resistor is obtained through calculation.
The electrical circuit line quality detection device according to claim 1, wherein, when the control module is in the detection mode, it first detects whether the voltage of the alternating current is within a normal voltage range, and if it is In the normal voltage value interval, detect and calculate the line resistance value again; if it exceeds the normal voltage value interval, stop detecting and calculating the line resistance value, and display a corresponding voltage abnormality through the display module message; in addition, the normal voltage range is between 90 volts and 250 volts.
The electrical circuit line quality detection device according to claim 1, wherein, when the control module is in the detection mode, it first detects whether the frequency of the alternating current is within a normal frequency range, and if it is In the normal frequency value interval, detect and calculate the line resistance value again; if it exceeds the normal frequency value interval, stop detecting and calculating the line resistance value, and display a corresponding abnormal frequency through the display module message; in addition, the normal frequency range is between 47 Hz and 63 Hz.