TWI805339B - Power extension cord - Google Patents

Abstract

Provided is a power extension cord, including a first power side and a second power side. The first power side includes an AC socket unit, a power relay, a surge and lightning strike protection unit, and an AC power detection unit. The surge and lightning strike protection unit is arranged in an accommodating space, and is connected to the power relay and receives AC input. When abnormal high voltage or lightning strike occurs, the surge and lightning strike protection unit will be short-circuited instantaneously. The AC power detection unit is arranged in the accommodating space, and provides a zero-crossing signal detection of the AC power, calculates the on-delay of the mechanical switch of the relay through the protection mechanism of programmable control, and conducts the measurement of the voltage, current, power and power factor of the AC power through the AC power integrated circuit. The second power side includes a digital interface isolation unit, which is arranged in the accommodating space and isolates the electrical signals of the first power side and the second power side; a microcontroller unit, which is arranged in the accommodating space and connected to the digital interface isolation unit, a digital display unit, a light signal and buzzer warning unit and a USB charging and identification unit, wherein the microcontroller unit reads the current consumption value of the AC power detection unit over time through the digital interface isolation unit, when it is detected that the current consumption value exceeds the current range, the power relay will be turned off, and the output value of the AC socket unit will be cut off, so as to achieve a programmable control over-current power-off protection mechanism; and a temperature detection unit, which is arranged in the accommodating space and connected to the microcontroller unit, when it is detected that the temperature is too high, the microcontroller unit will turn off the power relay and cut off the output of the AC socket unit, so as to achieve a programmable control overheating protection mechanism.

Description

power extension cord

The invention relates to an electric extension cord, in particular to an electric extension cord with multiple protection functions.

Due to the rapid development of technology, electronic products have become an indispensable item in today's life. When multiple electronic products need to be used at the same time, the limited number of sockets and charging capacity of the extension cord can no longer provide a variety of different electronic products plugged into the socket of the extension cord and supply enough power to the electronic products.

Once the extension cords on the market today supply power to a variety of different electronic products at the same time, the power supply of the extension cord may be overloaded, causing the power supply of the extension cord to exceed the originally set safe rated current, which will cause the extension cord to overload the power supply and cause the wire to catch fire , causing a fire that may endanger life and cause significant property damage.

Furthermore, the protection mechanisms used by extension cords on the market today almost all use no-fuse temperature trip switches as overcurrent protection, but no-fuse temperature trip switches are mechanical switches. When the power is overloaded, it is necessary to After a period of time, the over-current tripping protection will be carried out.

Therefore, how to provide a better power extension cord, which can provide lightning strike and surge protection, over-temperature protection, and is suitable for AC extension cord overload protection, overload abnormal detection Measuring function, warning display, button setting and other functions are actually one of the important issues at present.

In view of the above-mentioned shortcomings of the prior art, the present invention provides a power extension cord.

According to an embodiment of the present invention, the electric power extension cord of the present invention includes a first electric side and a second electric side, wherein the first electric side includes: an AC socket unit, which is used for socket connection; a power relay, which is arranged on in the accommodation space and connected to the AC socket unit; the surge and lightning strike protection unit is installed in the accommodation space, connected to the power relay and receiving AC input, wherein, when abnormal high voltage or lightning strike occurs, The surge and lightning protection unit will be short-circuited instantaneously; and the AC power detection unit is installed in the accommodation space, and provides the detection of the zero-crossing signal of the alternating current, and calculates the conduction delay of the mechanical switch of the relay through the programmable control protection mechanism, And the measurement of AC voltage, current, power, and power factor is carried out through the AC power integrated circuit, and the second electrical side includes: a digital interface isolation unit: it is arranged in the accommodation space and isolates the first electrical side and the electrical signal of the second electrical side; the microcontroller unit is set in the accommodation space and connected to the digital interface isolation unit, digital display unit, lamp and buzzer warning unit and USB charging and An identification unit, wherein the microcontroller unit reads the current consumption value of the AC power detection unit over time through the digital interface isolation unit, and when it detects that the current consumption value exceeds the current range, the power relay will be closed, and cut off the output voltage of the AC socket unit to achieve a programmable control over-current protection mechanism; and a temperature detection unit is arranged in the accommodation space and connected to the microcontroller unit, wherein, When detecting that the temperature is too high, the microcontroller unit will turn off the power relay and cut off the output of the AC socket unit, so as to achieve a programmable control overheating protection mechanism.

Preferably, the power extension cord of the present invention further includes a first AC/DC converter unit for converting AC voltage into DC voltage and supplying power to the AC power detection unit and the power relay on the first electrical side.

Preferably, the power extension cord of the present invention further includes: a second AC/DC converter unit, which converts the AC voltage into a DC voltage, and supplies power to the microcontroller unit on the second electrical side, the temperature detection unit unit, the digital display unit, the light signal and buzzer warning unit and the USB charging and identification unit.

Preferably, the power extension cord of the present invention further includes: a key switch unit connected to the microcontroller unit and capable of setting, resetting, and turning on and off the digital display unit.

Preferably, the digital display unit displays the current setting value and the real-time consumption value.

Preferably, when it is detected that the current consumption value exceeds the current range, the light and buzzer warning unit activates the operation state light and the overload warning sound.

Preferably, the USB charging and identification unit identifies various mobile phones through the USB communication interface, and provides fast charging.

Preferably, when it is detected that the current consumption value exceeds the current range, the power relay will be turned off, and the output voltage of the USB charging and identification unit will be cut off, so as to achieve a protection mechanism of programmable control over-current power-off.

1: The first electrical side

10: Housing

11: AC socket unit

12: Power relay

13: Surge and lightning protection unit

14: AC power detection unit

15: First AC/DC converter unit

19: Power Indicator

2: Second electrical side

20: Current switch

21: Digital interface isolation unit

22: Microcontroller unit

23: Digital display unit

24: Light signal and buzzer warning unit

25: USB charging and identification unit

26: Temperature detection unit

27:Key switch unit

28: Second AC/DC converter unit

Fig. 1 is a schematic block diagram showing an electric extension cord of the present invention according to an embodiment of the present invention; and

Fig. 2 is a perspective view showing the electric extension cord of the present invention according to the embodiment of the present invention.

The implementation of the present invention is described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific examples, and various modifications and changes can be made to the details in the description of the present invention based on different viewpoints and applications without departing from the spirit of the present invention.

It should be noted that the structures, proportions, sizes, etc. shown in the accompanying drawings of the present invention are only used to match the content disclosed in the specification, for those who are familiar with the art to read and understand, and are not used to limit the conditions for the implementation of the present invention , so it has no technical substantive meaning, and any modification of structure, change of proportional relationship or adjustment of size shall fall within the scope of the disclosure of the present invention without affecting the effect and purpose of the present invention. The technical content must be within the scope covered.

The present invention proposes a power extension cord. Through a programmable control mechanism, the present invention has functions or mechanisms such as lightning strike and surge protection, over-temperature protection, overload abnormal detection, and warning display, and through AC power detection The unit provides the detection of the zero-crossing signal of the alternating current, and calculates the conduction delay of the relay mechanical switch through the programmable control protection mechanism, which can effectively reduce the generation of relay sparks.

FIG. 1 shows a schematic block diagram of the electric extension cord of the present invention. As shown in Figure 1, according to an embodiment of the present invention, the power extension cord of the present invention includes an accommodating space (not shown in Figure 1) (for example, a shell, a housing), a first electrical side 1 and a second electrical side 2. Wherein, the first electric side 1 can be a high electric side, for example, household lamps, sockets, etc., and the voltage is 110V~220V. Furthermore, electrical appliances such as lighting fixtures, electric water heaters, heaters, refrigerators, televisions, air conditioners, and audio equipment in household appliances are also high-voltage electrical equipment, and the second electrical side 2 refers to DC circuits or audio and video circuits. ,network Lines, telephone lines, the DC voltage is generally within 32V, that is, household appliances such as telephones, computers, and TV signal inputs (cable TV lines), audio equipment (output lines) and other household appliances are also weak electrical equipment. .

The first electrical side 1 includes an AC socket unit 11, a power relay 12, a surge and lightning protection unit 13, an AC power detection unit 14, and a first AC/DC converter unit 15, while the second electrical side 2 includes a digital interface isolation unit 21. Microcontroller unit 22, digital display unit 23, light signal and buzzer warning unit 24, USB charging and identification unit 25, temperature detection unit 26, key switch unit 27 and second AC/DC converter unit 28 .

According to an embodiment of the present invention, in the first electrical side 1, the AC socket unit 11 includes a plurality of sockets (used as a socket connection), and the power relay 12 (used as a protection switch) is arranged in the accommodation space and connected to the AC socket The unit 11 and the surge and lightning strike protection unit 13 are arranged in the accommodation space, and are connected to the power relay 12 and receive AC input, mainly as input protection, wherein, when abnormal high voltage or lightning strike occurs, the surge and lightning strike protection unit 13 will Instant short circuit to prevent damage to electrical products.

In addition, in the first electrical side 1, the AC power detection unit 14 is set in the accommodation space, and measures the voltage, current, power, and power factor of the AC power through the AC power integrated circuit, and the first AC power The DC/DC converter unit 15 converts the AC voltage into a DC voltage, and supplies power to the AC power detection unit 14 and the power relay 12 of the first electric side 1 .

According to the embodiment of the present invention, in the second electrical side 2, the digital interface isolation unit 21 is arranged in the accommodation space, and isolates the electrical signals of the first electrical side 1 and the second electrical side 2, and the microcontroller unit 22 It is set in the accommodation space and connected to the digital interface isolation unit 21, the digital display unit 23, the light and buzzer warning unit 24 and the USB charging and identification unit 25, wherein the micro The controller 22 reads the current consumption value of the AC power detection unit 14 over time through the digital interface isolation unit 21. When it detects that the current consumption value exceeds the current range, the power relay 12 will be turned off, and the AC socket unit 11 will be cut off. output voltage to achieve a programmable control over-current power-off protection mechanism.

In addition, in the second electrical side 2, the temperature detection unit 26 is arranged in the accommodation space and connected to the microcontroller unit 22, wherein, when the temperature is detected to be too high, the microcontroller unit 22 will shut down The power relay 12 cuts off the AC output of the AC socket unit 11 to achieve a programmable control overheating protection mechanism; the second AC/DC converter unit 28 converts the AC voltage into a DC voltage and supplies power to the second electrical side 2's microcontroller unit 22, temperature detection unit 26, digital display unit 23, lamp number and buzzer warning unit 24, and USB charging and identification unit 25; and the key switch unit 27 is connected to the microcontroller unit 22, And it has a digital display unit 23 for setting, resetting and opening and closing.

The digital display unit 23 is used to display the information of the current setting value and the real-time consumption value, and when it is detected that the current consumption value exceeds the current range, the light and buzzer warning unit 24 can activate the operation status light and the overload warning sound effect .

According to the embodiment of the present invention, the USB charging and identification unit 25 is to identify various mobile phones (such as the identification mechanisms of APPLE and SAMSUNG) through the USB communication interface, and provide fast charging, so that the charging mechanism can have 2.4A (5V) or QC3 .0_5V~12V or PD charging capacity, and then achieve fast charging, and can achieve overload protection and warning effects through the detection of the microcontroller unit. When it is detected that the current consumption value exceeds the current range, the power relay 12 will be turned off, and the output voltage of the USB charging and identification unit 25 will be cut off, so as to achieve a protection mechanism of programmable control over-current power-off.

To sum up the above, the first electrical side 1 with the power relay 12 and the AC power detection unit 14 has a microcontroller unit 22, a temperature detection unit 26, a digital display unit 23, a lamp and a buzzer warning unit 24, a USB The second electrical side 2 of the charging and identification unit 25 and the key switch unit 27 cooperates with each other and has a programmable control mechanism to achieve protection mechanisms against power failure, overheating, surge and lightning strike.

In addition, the key switch unit 27 can be used as user operation input, and the user can set, reset, turn on and turn off the display.

According to another embodiment of the present invention, FIG. 2 shows a three-dimensional schematic view of the power extension cord of the present invention. As shown in Figure 2, the appearance of the power extension cord of the present invention includes a housing 10 (that is, accommodating space), an AC socket unit 11, a digital display unit 23, a power indicator light 19, a current switch 20, and USB charging and identification Unit 25. The detailed description is as above, and will not be repeated here.

It is worth noting that since the power extension line of the present invention adopts electronic induction, when the electric power exceeds the set power value, the power extension line of the present invention will immediately execute within a very short time (for example, within 0.5 seconds). Overload tripping protection mechanism, and the present invention presets 4-stage modes (or unlimited or every 100W as a stage), so users can define when the overload tripping protection mechanism is required according to their needs. In addition, the power extension cord of the present invention is also equipped with a numerical display (or light) to display the overload state. According to the embodiment of the present invention, the user only needs to press the provided switch again to execute the overload protection mechanism again.

According to the above-mentioned embodiments, the power extension cord of the present invention has the following advantages: it has lightning strike and surge protection, has over-temperature protection, is suitable for AC extension cord overload protection, has multiple sets of three-hole grounding sockets and at least 3 meters to 10 meters of power supply line, with overload abnormal detection [current overload (1A, 5A, 10A, 15A) and start-up power-off (quick break ~ 0.5 seconds) and open warning], reduce relay sparks Health, automatic discrimination of 50Hz/60Hz, current consumption value can be displayed, slide switch selection 1A, 5A, 10A, 15A (can be matched with LED display), with warning function (when the current is overloaded, the buzzer will sound and match with LED display) , With multiple USB Type-A outputs or Type-C or PD outputs (support various USB charging specifications, the maximum output current is 2.4A (5V~12V), USB over-current protection, LED display power status), with button function (When the current is overloaded, press and hold for 3 seconds to restore the power supply; in normal mode, press once to select the LED digital on or off) and has a slide switch function [set battery overload (1A, 5A, 10A, 15A)] .

The above-mentioned embodiments are only illustrative to illustrate the effects of the present invention, and are not intended to limit the present invention. Anyone skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. In addition, the number of components in the above embodiments is only for illustrative purposes, and is not intended to limit the present invention. Therefore, the scope of protection of the rights of the present invention should be listed in the scope of patent application below.

1: The first electrical side

11: AC socket unit

12: Power relay

13: Surge and lightning protection unit

14: AC power detection unit

15: First AC/DC converter unit

2: Second electrical side

21: Digital interface isolation unit

22: Microcontroller unit

23: Digital display unit

24: Light signal and buzzer warning unit

25: USB charging and identification unit

26: Temperature detection unit

27:Key switch unit

28: Second AC/DC converter unit

Claims (8)

An electric extension cord comprising: The first electrical side and the second electrical side, wherein, The first electrical side contains: AC socket unit, used for socket connection; A power relay is arranged in the accommodating space and connected to the AC socket unit; The surge and lightning protection unit is arranged in the accommodation space, connected to the power relay and receiving AC input, wherein, when abnormal high voltage or lightning occurs, the surge and lightning protection unit will short-circuit instantaneously; and The AC power detection unit is set in the accommodating space, and provides the detection of the zero-crossing signal of the AC power, calculates the conduction delay of the mechanical switch of the relay through the programmable control protection mechanism, and measures the voltage of the AC power through the AC power integrated circuit , measurement of current, power, power factor, and The second electrical side contains: The digital interface isolation unit is arranged in the accommodation space and isolates the electrical signals of the first electrical side and the second electrical side; The microcontroller unit is arranged in the accommodation space and connected to the digital interface isolation unit, the digital display unit, the light and buzzer warning unit, and the USB charging and identification unit, wherein the microcontroller unit passes through The digital interface isolation unit reads the current consumption value of the AC power detection unit over time, and when it detects that the current consumption value exceeds the current range, the power relay will be closed, and the output voltage of the AC socket unit will be cut off, In order to achieve a programmable control over-current protection mechanism; and The temperature detection unit is arranged in the accommodating space and connected to the microcontroller unit, wherein when the temperature is detected to be too high, the microcontroller unit will close the power relay, And cut off the output of the AC socket unit to achieve a programmable control overheating protection mechanism. The power extension cord described in item 1 of the scope of the patent application further includes: a first AC/DC converter unit that converts AC voltage into DC voltage and supplies power to the AC power detection unit on the first electrical side and the power relay. The power extension cable described in item 1 of the scope of the patent application further includes: a second AC/DC converter unit that converts AC voltage into DC voltage and supplies power to the microcontroller unit on the second electrical side, The temperature detection unit, the digital display unit, the lamp and buzzer warning unit and the USB charging and identification unit. The power extension cord as described in item 1 of the scope of the patent application further includes: a key switch unit connected to the microcontroller unit and capable of setting, resetting, and turning on and off the digital display unit. The electric power extension cord described in item 1 of the scope of the patent application, wherein the digital display unit displays the current setting value and the real-time consumption value. The power extension cord described in item 2 of the scope of the patent application, wherein, when it is detected that the current consumption value exceeds the current range, the light and buzzer warning unit activates the operation status light and the overload warning sound. The power extension cord described in Item 1 of the scope of the patent application, wherein the USB charging and identification unit identifies various mobile phones through the USB communication interface and provides fast charging. The power extension cord described in item 5 of the scope of the patent application, wherein, when it is detected that the current consumption value exceeds the current range, the power relay will be closed, and the output voltage of the USB charging and identification unit will be cut off to achieve Programmable control over-current protection mechanism.

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