CN205178188U - Safety socket - Google Patents

Abstract

The utility model discloses a safety socket, including the casing, lay the electronic circuit board in the casing and lay USB interface, power indicator and the liquid crystal touch screen on the casing, integrated on the electronic circuit board have microcontroller and a power module, microcontroller's input termination has temperature detection module to flow a detection module with pressing, microcontroller's output termination has relay protection module and thermal module, power module presses stream detection module to include current transformer, voltage transformer and electric current signal conditioning circuit including the commercial power, reduction voltage circuit, rectifier circuit and the level shifting circuit that connect gradually to and analog switch circuit and AD converter, the relay protection module includes delay circuit and relay, and thermal module includes direct current motor module and fan. The utility model relates to a circuit is simple, and reasonable in design uses portably, avoids electrical apparatus standby power consumption, increases the security and the convenience of the row's of inserting use, and the practicality is strong, convenient to popularize and use.

Description

a safety socket

technical field

The utility model belongs to the technical field of safety sockets, in particular to a safety socket.

Background technique

At present, with the improvement of living standards, more and more household appliances are used, and sockets have become an indispensable device in life. The socket is also called a socket, a power strip or a power strip, etc. It is a mobile socket, and its technical term is a power converter. The plug strip is a female connector with a jack or a concave hole, which is used to insert a rod-shaped or copper plate-shaped protruding power plug to conduct electricity to household appliances through the plug. Improper use can cause personal electric shock and electrical fire accidents, resulting in heavy losses. The current plug-in strip also has some disadvantages: first, because the plug-in strip is an intermediate connector connecting the household appliances and the power supply, household appliances such as refrigerators, air conditioners and washing machines cannot be completely closed only by pressing the shutdown button on the household appliances. The power supply and household appliances are in standby state, which not only consumes power but also affects the service life of the household appliances themselves, and with the increase of household appliances, the energy consumed in standby increases rapidly, resulting in a serious waste of electric energy. Of course, during the use of the plug-in strip, if the current or voltage in the plug-in strip is too large, the commonly used plug-in strip has no protection device, and the plug-in strip cannot be cut off in time, which is likely to cause a safety accident. Secondly, with the development of science and technology, there are more and more electronic products that use USB ports to charge, such as mobile phones, tablet computers, mobile power supplies, MP5 and digital cameras, etc., and the existing power strips must be matched with charging conversion plugs The charging is completed, which brings inconvenience to the user. In addition, the plug-in strip is the main electrical power conversion device. The existing plug-in strip is generally not installed with a heat sink, and it is easy to overheat after long-term use and cause failure or burnout. service life. Finally, there are smart sockets on the market, including timer sockets and remote control sockets. The timer socket has a timing function. Although it can control electrical appliances to work in a specific period of time, it reduces the idle time in a certain program. Energy is wasted, but if the use time of the electrical appliance is not fixed, it needs to be reset, which is inconvenient to use; in addition, although the remote control strip can be controlled from a long distance, it needs to be equipped with a dedicated remote control, which is expensive and cannot meet the needs of the public. Therefore, there is a lack of a safe plug-in strip with simple structure, low cost, reasonable design, and easy operation, which can avoid energy consumption of electrical appliances in standby and increase the safety and convenience of the plug-in strip.

Utility model content

The technical problem to be solved by the utility model is to provide a safe plug-in strip for the deficiencies in the above-mentioned prior art. The utility model has a simple design circuit, a reasonable design, and is easy to use. Sex and convenience, strong practicability, easy to popularize and use.

In order to solve the above technical problems, the technical solution adopted by the utility model is: a safe plug-in strip, which is characterized in that it includes a housing, an electronic circuit board arranged in the housing, and a USB interface arranged on the housing , a power indicator light and a liquid crystal touch screen, a microcontroller and a power module are integrated on the electronic circuit board, and the input terminal of the microcontroller is connected with a temperature detection module and a voltage sensor for detecting voltage and current data on the plug-in power transmission line A current detection module, the output terminal of the microcontroller is connected with a relay protection module and a heat dissipation module; the power supply module includes a mains power supply, a step-down circuit, a rectifier circuit and a level conversion circuit connected in sequence, and the voltage current detection module It includes a current transformer for collecting current signals on the plug-in power transmission line, a voltage transformer for collecting voltage signals on the plug-in power transmission line, a current signal conditioning circuit connected to the output end of the current transformer, and a The analog switch circuit that the output end of the current transformer and the output end of the voltage transformer are all connected, the output end of the analog switch circuit is connected with an A/D converter connected with the input end of the microcontroller, and the current signal conditioning The output end of the circuit and the output end of the level conversion circuit are all connected to the input end of the microcontroller, and the relay protection module includes a delay circuit and a relay connected to the output end of the delay circuit, and the heat dissipation module It includes a DC motor module and a fan connected to the output end of the DC motor module, the input end of the delay circuit, the input end of the DC motor module and the input end of the power indicator light are all connected to the output end of the microcontroller , the liquid crystal touch screen is connected to the microcontroller, and the input end of the USB interface is connected to the output end of the level conversion circuit.

The above-mentioned safety plug-in strip is characterized in that: the current transformer includes a sensor ACS712ELC-20A.

The above-mentioned safety plug strip is characterized in that: the current signal conditioning circuit includes a chip LM358, the inverting input terminal of the chip LM358 is connected to the signal output terminal of the sensor ACS712ELC-20A through a resistor R17, and the inverting input terminal of the chip LM358 is The input terminal is divided into two circuits, one is connected to the output terminal of the 5V power supply through the resistor R18, and the other is grounded through the resistor R19; the output terminal of the chip LM358 is divided into two circuits, one is connected to the inverting input terminal of the chip LM358 through the resistor R22, and the other is connected to the inverting input terminal of the chip LM358 through the resistor R22. One way is connected with the microcontroller through the resistor R20.

The above-mentioned safety plug-in strip is characterized in that the voltage transformer includes a sensor ZMPT101B.

The above-mentioned safety plug strip is characterized in that: the A/D converter includes a chip PCF8591, the first pin of the chip PCF8591 is connected to the signal output end of the analog switch circuit, and the ninth pin of the chip PCF8591 pin, the 10th pin and the 15th pin are connected with the microcontroller.

The above-mentioned safety plug-in strip is characterized in that: the step-down circuit includes a transformer T1, one end of the primary coil of the transformer T1 is connected to one end of the mains, and the other end of the primary coil of the transformer T1 is connected to the mains. connected at the other end;

The rectifier circuit includes a rectifier bridge D1, the two AC input ends of the rectifier bridge D1 are respectively connected to the two ends of the secondary coil of the transformer T1;

The level conversion circuit includes a chip LM7805, the Vin pin of the chip LM7805 is connected to the positive DC output end of the rectifier bridge D1, and the connection point between the Vin pin of the chip LM7805 and the positive DC output end of the rectifier bridge D1 It is the 12V DC power supply terminal, the GND pin of the chip LM7805 and the negative DC output terminal of the rectifier bridge D1 are grounded, and the Vout pin of the chip LM7805 is the 5V power supply output terminal.

The above-mentioned safety plug-in strip is characterized in that: the delay circuit includes a chip NE555, the second pin of the chip NE555 is divided into two circuits, one is connected to the output terminal of the 5V power supply through a resistor R2, and the other is connected to the output terminal of a 5V power supply through a capacitor C2 is connected to the microcontroller; the fifth pin of the chip NE555 is connected to the output terminal of the 5V power supply through a capacitor C14, and the connection ends of the sixth pin and the seventh pin of the chip NE555 are divided into three ways, one way The resistor R4 is connected to the output end of the 5V power supply, the other is connected to a fixed end of the sliding resistor R5, and the third is grounded through the capacitor C3; the other fixed end of the sliding resistor R5 is connected to the sliding end of the sliding resistor R5 terminal is connected with the output terminal of the 5V power supply, the 3rd pin of the chip NE555 is divided into two routes, one is grounded through the capacitor C4, and the other is connected with the cathode of the rectifying diode D1; the anode of the rectifying diode D1 is grounded;

The relay includes a relay K1, one end of the coil of the relay K1 is connected to the cathode of the rectifier diode D1, the other end of the coil of the relay K1 is connected to the anode of the rectifier diode D1, and the normally open contact of the relay K1 Click on it.

The above-mentioned safety plug-in strip is characterized in that: the temperature detection module includes a sensor PT100.

The above-mentioned safe plug-in strip is characterized in that: the microcontroller includes an MSP430 single-chip microcomputer or an ARM microcontroller.

Compared with the prior art, the utility model has the following advantages:

1. The utility model is equipped with a pressure current detection module to detect and collect the current signal and voltage signal on the plug-in transmission line in real time, so as to play the role of over-current and over-voltage protection.

2. By setting the relay protection module, the mains power can be cut off to provide power for the electrical equipment plugged into the socket. On the one hand, it can protect the power supply of electrical equipment, and on the other hand, it can prevent household appliances from being in a standby state and reduce energy consumption.

3. The utility model can charge the electronic equipment with the USB interface by setting the level conversion circuit and the USB interface, and does not need to be equipped with a charging conversion plug, which is convenient and fast.

4. The utility model uses a temperature detection module to detect the temperature inside the plug-in housing in real time, and lowers the temperature inside the plug-in housing through the heat dissipation module to prevent the plug-in from being burned out due to excessive temperature.

To sum up, the utility model has a simple design circuit, a reasonable design, and is easy to use, which avoids energy consumption of electrical appliances in standby, increases the safety and convenience of plug-in strips, has strong practicability, and is easy to popularize and use.

The technical solutions of the present utility model will be further described in detail through the drawings and embodiments below.

Description of drawings

Fig. 1 is the block diagram of circuit principle of the utility model.

Fig. 2 is a schematic circuit diagram of the current signal conditioning circuit of the present invention.

Fig. 3 is the circuit schematic diagram of the utility model A/D converter.

Fig. 4 is a schematic diagram of the circuit connections of the step-down circuit, the rectifier circuit and the level conversion circuit of the present invention.

Fig. 5 is a schematic diagram of the circuit connection relationship between the delay circuit and the relay of the present invention.

Explanation of reference signs:

1—microcontroller; 2—current signal conditioning circuit; 3—current transformer;

4—A/D converter; 5—analog switch circuit; 6—voltage transformer;

7—temperature detection module; 8-1—mains electricity; 8-2—decompression circuit;

8-3—rectifier circuit; 8-4—level conversion circuit; 9—USB interface;

10-1—delay circuit; 10-2—relay; 11—power indicator light;

12-1—DC motor module; 12-2—fan; 13—LCD touch screen.

detailed description

As shown in Figure 1, the utility model includes a housing, an electronic circuit board arranged in the housing, a USB interface 9 arranged on the housing, a power indicator light 11 and a liquid crystal touch screen 13, the electronic circuit board A microcontroller 1 and a power supply module are integrated on it, and the input terminal of the microcontroller 1 is connected with a temperature detection module 7 and a pressure and current detection module for detecting the pressure and current data on the plug-in power transmission line, and the microcontroller 1 The output terminal is connected with a relay protection module and a heat dissipation module; the power module includes a commercial power supply 8-1, a step-down circuit 8-2, a rectification circuit 8-3 and a level conversion circuit 8-4 connected in sequence, and the voltage The current detection module includes a current transformer 3 for collecting current signals on the plug-in power transmission line, a voltage transformer 6 for collecting voltage signals on the plug-in power transmission line, and a current signal connected to the output terminal of the current transformer 3 Conditioning circuit 2, and the analog switch circuit 5 connected with the output end of the current transformer 3 and the output end of the voltage transformer 6, the output end of the analog switch circuit 5 is connected with the input end of the microcontroller 1 A/D converter 4, the output end of the current signal conditioning circuit 2 and the output end of the level conversion circuit 8-4 are all connected to the input end of the microcontroller 1, and the relay protection module includes a delay circuit 10-1 and a relay 10-2 connected to the output end of the delay circuit 10-1, the heat dissipation module includes a DC motor module 12-1 and a fan connected to the output end of the DC motor module 12-1 12-2, the input end of the delay circuit 10-1, the input end of the DC motor module 12-1 and the input end of the power indicator light 11 are all connected to the output end of the microcontroller 1, and the liquid crystal touch screen 13 It is connected with the microcontroller 1, and the input end of the USB interface 9 is connected with the output end of the level conversion circuit 8-4.

In this embodiment, the current transformer 3 includes a sensor ACS712ELC-20A.

As shown in Figure 2, in this embodiment, the current signal conditioning circuit 2 includes a chip LM358, the inverting input terminal of the chip LM358 is connected to the signal output terminal of the sensor ACS712ELC-20A through a resistor R17, and the inverting input terminal of the chip LM358 is The input terminal is divided into two circuits, one is connected to the output terminal of the 5V power supply through the resistor R18, and the other is grounded through the resistor R19; the output terminal of the chip LM358 is divided into two circuits, one is connected to the inverting input terminal of the chip LM358 through the resistor R22, and the other is connected to the inverting input terminal of the chip LM358 through the resistor R22. One way is connected with the microcontroller 1 through the resistor R20.

In this embodiment, the voltage transformer 6 includes a sensor ZMPT101B.

As shown in Figure 3, in the present embodiment, the A/D converter 4 includes a chip PCF8591, the first pin of the chip PCF8591 is connected to the signal output end of the analog switch circuit 5, the first pin of the chip PCF8591 The 9th pin, the 10th pin and the 15th pin are all connected with the microcontroller 1 .

As shown in Figure 4, in this embodiment, the step-down circuit 8-2 includes a transformer T1, one end of the primary coil of the transformer T1 is connected to one end of the mains 8-1, and the other end of the primary coil of the transformer T1 One end is connected with the other end of the mains 8-1;

The rectification circuit 8-3 includes a rectification bridge D1, and the two AC input ends of the rectification bridge D1 are respectively connected to the two ends of the secondary coil of the transformer T1;

The level conversion circuit 8-4 includes a chip LM7805, the Vin pin of the chip LM7805 is connected to the positive DC output terminal of the rectifier bridge D1, and the Vin pin of the chip LM7805 is connected to the positive DC output terminal of the rectifier bridge D1. The connection point of the chip is the 12V DC power supply terminal, the GND pin of the chip LM7805 and the negative DC output terminal of the rectifier bridge D1 are grounded, and the Vout pin of the chip LM7805 is the 5V power supply output terminal.

As shown in Figure 5, in the present embodiment, the delay circuit 10-1 includes a chip NE555, and the second pin of the chip NE555 is divided into two paths, one path is connected to the output end of the 5V power supply through a resistor R2, and the other path Connect with microcontroller 1 through capacitor C2; the 5th pin of the chip NE555 is connected with the output terminal of the 5V power supply through capacitor C14, and the connection ends of the 6th pin and the 7th pin of the chip NE555 are divided into three One way is connected to the output end of the 5V power supply through the resistor R4, the other way is connected to a fixed end of the sliding resistor R5, and the third way is grounded through the capacitor C3; the other fixed end of the sliding resistor R5 is connected to the sliding resistor R5 The connecting end of the sliding end is connected to the output end of the 5V power supply, and the third pin of the chip NE555 is divided into two circuits, one of which is connected to the ground through the capacitor C4, and the other is connected to the cathode of the rectifying diode D1; the anode of the rectifying diode D1 is connected to the ground ;

The relay 10-2 includes a relay K1, one end of the coil of the relay K1 is connected to the cathode of the rectifier diode D1, the other end of the coil of the relay K1 is connected to the anode of the rectifier diode D1, and the relay K1 The normally open contact is floating.

During actual use, the common contact and the normally closed contact of the relay K1 are connected in series to the power transmission line that the mains 8-1 supplies power to the strip.

In this embodiment, the temperature detection module 7 includes a sensor PT100.

In this embodiment, the microcontroller 1 includes an MSP430 single-chip microcomputer or an ARM microcontroller.

When the utility model is in use, the mains power 8-1 is converted to 12V alternating current through the step-down circuit 8-2, and the 12V alternating current is sent to the level conversion circuit 8-4 through the rectification circuit 8-3, and then the level conversion circuit 8-4 Process and output 5V direct current, 5V direct current supplies power to microcontroller 1, microcontroller 1 controls power indicator light 11 to light up, and the output end of level conversion circuit 8-4 can charge the electronic equipment of USB interface through USB interface 9 simultaneously. The voltage threshold and temperature threshold are preset through the liquid crystal touch screen 13, the current transformer 3 detects the current on the plug-in power transmission line in real time and sends the collected current signal to the analog switch circuit 5, and the voltage transformer 6 detects the plug-in power transmission line in real time and the voltage signal collected is sent to the analog switch circuit 5, and the analog switch circuit 5 gates the current signal collected by the current transformer 3 and the voltage signal collected by the voltage transformer 6, and the gated The current signal or voltage signal is output to the A/D converter 4, and the A/D converter 4 receives the current signal or voltage signal output by the analog switch circuit 5, completes the conversion from the analog signal to the digital signal, and converts the converted digital current signal Or the digital voltage signal is sent to the microcontroller 1, and the microcontroller 1 compares the received digital voltage signal with the preset voltage threshold. When the digital voltage signal received by the microcontroller 1 is greater than the preset voltage When the threshold is reached, the microcontroller 1 controls the relay 10-2 to work through the delay circuit 10-1, the normally closed contact of the relay 10-2 is disconnected, and the connection between the plug strip and the mains 8-1 is cut off, and the power supply on the plug strip The indicator light 11 is off; the current transformer 3 sends the collected current signal into the current signal conditioning circuit 2, and when the current signal collected by the current transformer 3 is relatively large, the current signal conditioning circuit 2 outputs a low level, and the microcontroller 1. The relay 10-2 is controlled by the delay circuit 10-1 to work, the normally closed contact of the relay 10-2 is disconnected, the connection between the plug strip and the mains 8-1 is cut off, and the power indicator light 11 on the plug strip goes out; When the digital current signal is not received by the microcontroller 1, the microcontroller 1 controls the relay 10-2 to work through the delay circuit 10-1, the normally closed contact of the relay 10-2 is disconnected, and the plug strip and the mains 8 are cut off. -1 connection, the power indicator light 11 on the plug strip goes out; the temperature detection module 7 detects the temperature inside the plug strip casing in real time and sends the collected temperature data to the microcontroller 1, and the microcontroller 1 pairs the received The temperature data is compared with a preset temperature threshold. When the temperature data received by the microcontroller 1 is greater than the temperature threshold, the microcontroller 1 controls the DC motor module 12-1 to work, and the DC motor module 12-1 drives the fan 12- 2 rotate to dissipate heat inside the plug-in housing; in addition, the liquid crystal touch screen 13 displays digital current signals, digital voltage signals and humidity data in real time for easy viewing.

The above are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any simple modifications, changes and equivalent structural changes made to the above embodiments according to the technical essence of the present utility model still belong to Within the scope of protection of the technical solution of the utility model.

Claims (9)

1. A safe plug-in strip, characterized in that: comprising a housing, an electronic circuit board arranged in the housing, and a USB interface (9), a power indicator light (11) and a liquid crystal touch screen arranged on the housing (13), a microcontroller (1) and a power module are integrated on the electronic circuit board, and the input terminal of the microcontroller (1) is connected with a temperature detection module (7) and is used for detecting The pressure-current detection module of pressure-current data, the output terminal of described micro-controller (1) is connected with relay protection module and cooling module; Described power supply module comprises city electricity (8-1) connected in turn, step-down circuit (8 -2), a rectifier circuit (8-3) and a level conversion circuit (8-4), the pressure current detection module includes a current transformer (3) for collecting the current signal on the plug-in power transmission line, for collecting The voltage transformer (6) of the voltage signal on the plug-in transmission line and the current signal conditioning circuit (2) connected with the output end of the current transformer (3), and the output end of the current transformer (3) and The analog switch circuit (5) that the output terminals of the voltage transformer (6) are all connected, the output terminal of the analog switch circuit (5) is connected with the A/D converter ( 4), the output end of the current signal conditioning circuit (2) and the output end of the level conversion circuit (8-4) are all connected to the input end of the microcontroller (1), and the relay protection module includes a time delay A circuit (10-1) and a relay (10-2) connected to the output end of the delay circuit (10-1), the heat dissipation module includes a DC motor module (12-1) and a DC motor module (12-1) the fan (12-2) connected to the output end, the input end of the delay circuit (10-1), the input end of the DC motor module (12-1) and the power indicator light (11) The input terminals are all connected with the output terminals of the microcontroller (1), the liquid crystal touch screen (13) is connected with the microcontroller (1), and the input terminals of the USB interface (9) are connected with the level conversion circuit The output terminals of (8-4) are connected. 2. A safety plug-in strip according to claim 1, characterized in that: the current transformer (3) includes a sensor ACS712ELC-20A. 3. A safety plug-in strip according to claim 2, characterized in that: the current signal conditioning circuit (2) includes a chip LM358, the inverting input terminal of the chip LM358 is connected to the sensor ACS712ELC-20A via resistor R17 The signal output terminals are connected, and the non-inverting input terminal of the chip LM358 is divided into two circuits, one of which is connected to the output terminal of the 5V power supply through the resistor R18, and the other is connected to the ground through the resistor R19; The inverting input terminals of the LM358 are connected, and the other path is connected with the microcontroller (1) through the resistor R20. 4. The safety plug-in strip according to claim 1, characterized in that: the voltage transformer (6) includes a sensor ZMPT101B. 5. A safety plug strip according to claim 1, characterized in that: the A/D converter (4) includes a chip PCF8591, the first pin of the chip PCF8591 is connected to the analog switch circuit (5) The signal output ends are connected, and the 9th pin, the 10th pin and the 15th pin of the chip PCF8591 are all connected with the microcontroller (1). 6. A safety plug strip according to claim 1, characterized in that: the step-down circuit (8-2) includes a transformer T1, one end of the primary coil of the transformer T1 is connected to the mains (8-1) One end of the transformer T1 is connected, and the other end of the primary coil of the transformer T1 is connected with the other end of the mains (8-1); The rectification circuit (8-3) includes a rectification bridge D1, and the two AC input ends of the rectification bridge D1 are respectively connected to the two ends of the secondary coil of the transformer T1; Described level conversion circuit (8-4) comprises chip LM7805, and the Vin pin of described chip LM7805 is connected with the positive DC output terminal of rectifier bridge D1, and the Vin pin of chip LM7805 and the positive DC output terminal of rectifier bridge D1 The connection point between them is the 12V DC power supply terminal, the GND pin of the chip LM7805 and the negative DC output terminal of the rectifier bridge D1 are grounded, and the Vout pin of the chip LM7805 is the 5V power supply output terminal. 7. A safety plug strip according to claim 1, characterized in that: the delay circuit (10-1) includes a chip NE555, and the second pin of the chip NE555 is divided into two circuits, one of which passes through the resistor R2 Connect with the output terminal of the 5V power supply, and another road connects with the microcontroller (1) through the capacitor C2; the 5th pin of the chip NE555 is connected with the output terminal of the 5V power supply through the capacitor C14, and the 6th pin of the chip NE555 is connected with the output terminal of the 5V power supply through the capacitor C14 The connecting end of the pin and the 7th pin is divided into three ways, one way is connected to the output end of the 5V power supply through the resistor R4, the other way is connected to a fixed end of the sliding resistor R5, and the third way is grounded through the capacitor C3; the sliding The connection between the other fixed end of the resistor R5 and the sliding end of the sliding resistor R5 is connected to the output end of the 5V power supply. The third pin of the chip NE555 is divided into two paths, one path is grounded through the capacitor C4, and the other path is connected to the rectifier diode D1. The cathodes are connected; the anode of the rectifier diode D1 is grounded; The relay (10-2) includes a relay K1, one end of the coil of the relay K1 is connected to the cathode of the rectifier diode D1, and the other end of the coil of the relay K1 is connected to the anode of the rectifier diode D1, and the relay The normally open contact of K1 is floating. 8. The safety socket according to claim 1, characterized in that: the temperature detection module (7) includes a sensor PT100. 9. A safety plug strip according to claim 1, characterized in that: the microcontroller (1) includes an MSP430 single-chip microcomputer or an ARM microcontroller.