CN202550222U - Socket safety protection device and safety protection socket - Google Patents

Abstract

The utility model discloses a socket safety protection device, which comprises a single-chip microcomputer control circuit, an action circuit and a current detection circuit. The single-chip microcomputer control circuit includes a single-chip microcomputer; the action circuit includes a relay and an elastic button. The contact switch is connected in series to the socket power input line, and the elastic button is linked with the contact switch; the first end of the current detection circuit is connected to the single-chip microcomputer, and the second end is connected to the working circuit through a transformer; I _A judges whether the load is in the standby state, and stops driving the relay when the load is in the standby state. The socket safety protection device provided by the utility model has the functions of automatic power-off in standby and self-locking protection in power failure, so as to prevent waste of electric energy and thoroughly protect the use safety of household appliances. At the same time, the utility model also discloses a safety protection socket using the above socket safety protection device.

Description

Socket safety protection device and safety protection socket

technical field

The utility model relates to a socket used for conductive connection, in particular to a socket safety protection device and a safety protection socket using the safety protection device.

Background technique

During the use of household appliances, the following safety problems are often encountered: 1. Forgot to turn off the power when not in use for a long time, causing the appliance to stand by for a long time, which not only consumes electricity, but also easily causes aging of components and safety accidents. 2. During the normal operation of household appliances, if the power fails suddenly, if the user forgets to unplug the appliance, the household appliances will continue to run automatically after the power comes in, wasting electric energy. In addition, in the initial stage of power supply restoration in the power grid, the power quality is not stable, and phenomena such as voltage fluctuations and surge shocks often occur. For example, household appliances run automatically at this time, which is easy to cause damage and even cause safety accidents. 3. Due to the instability of power supply quality, household appliances often encounter overvoltage during operation. For example, when the line is rebuilt, the wrong line is connected, and the 220V power supply is changed to 380V. This will cause household appliances to burn out and even cause fire accidents. .

At present, there are some single-function protection devices that solve the above-mentioned safety problems, such as overvoltage protection switches, automatic power-off sockets, and the like. However, a single protection function cannot effectively avoid various emergencies in the power system. If the user wants to protect the above three common situations, he will have to use three sets of protection devices, which wastes space and is very difficult to install and connect. Difficult, and the cost of three sets of protective devices is also relatively high.

Contents of the invention

The first technical problem to be solved by the utility model is to provide a socket safety protection device, which has the functions of automatic power-off in standby and self-locking protection in power failure, so as to prevent waste of electric energy and thoroughly protect the safety of household appliances.

The second technical problem to be solved by the utility model is to provide a safety protection socket using the above socket safety protection device.

The technical scheme adopted by the utility model to solve the above-mentioned first technical problem is: a socket safety protection device, which includes a single-chip microcomputer control circuit, an action circuit and a current detection circuit, the single-chip microcomputer control circuit includes a single-chip microcomputer; the action circuit includes A relay and an elastic button, the relay is connected to the output end of the single-chip microcomputer, the contact switch of the relay is connected in series with the socket power input line, the elastic button is associated with the contact switch; the current detection circuit first The end is connected with the single-chip microcomputer, and the second end is connected with the working circuit through the transformer, and the current amplifying circuit is set between the first end and the second end of the current detection circuit; the single-chip microcomputer is used to input the current IA according to the current detection circuit Judging whether the load is in the standby state, and stopping driving the relay when the load is in the standby state.

In one of the embodiments, the relay has two contact switches, the two contact switches are respectively connected in series to the live line and the neutral line of the socket power input line, and the two contact switches are linked.

In one of the embodiments, the action circuit further includes a relay drive circuit, the relay drive circuit includes a switch transistor, a first resistor, a second resistor and a first capacitor, the collector of the switch transistor is connected to the relay coil One end is connected, the other end of the relay coil is connected to the fire wire of the socket power input line, the base of the switch triode is connected to the output terminal of the single-chip microcomputer through the first resistor, and the second resistor and the first capacitor It is connected in parallel between the base and the collector of the switch triode.

In one of the embodiments, the action circuit further includes a diode, which is connected in series between the relay coil and the live wire of the socket power input wire.

In one of the embodiments, the input terminal of the power supply circuit of the single-chip microcomputer control circuit is connected to the power input line of the socket.

In one of the embodiments, the socket safety protection device further includes an overvoltage circuit, which is used to detect the voltage UA on the power input line of the socket, and input the voltage UA to the single-chip microcomputer, and the single-chip microcomputer It is used to judge whether the power supply voltage is overvoltage according to the voltage UA, and stop driving the relay when the power supply voltage is overvoltage.

In one of the embodiments, the overvoltage circuit includes a transient voltage suppression diode, a third resistor, a fourth resistor, a second capacitor, and a third capacitor, and the input end of the transient voltage suppression diode is connected to the socket power input On the live line of the line, the output end of the transient voltage suppression diode is connected to one end of the third resistor, the other end of the third resistor is connected to the input end of the single-chip microcomputer, and the other end is connected to the The fourth resistor, the second capacitor and the third capacitor are grounded.

The technical solution adopted by the utility model to solve the above-mentioned second technical problem is: a safety protection socket, which includes a socket body, and the socket safety protection device is arranged in the socket body.

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

The socket safety protection device and safety protection socket provided by the utility model have the functions of automatic power-off in standby, self-locking protection function in power failure and over-voltage power-off function:

1. Standby automatic power-off function: When household appliances are in standby, the power consumption is low and the current is extremely small. The current value of the standby current is detected by the current detection circuit. If the user does not use it for a long time, the microcontroller will stop driving the action circuit, the relay coil will lose power, release the contact switch, and the socket will stop working. If the power supply needs to be restored, the elastic button must be manually pressed to turn on the power again;

2. Power failure self-locking function: the socket is designed with an elastic button, which pops up after a power failure. If the power supply needs to be restored, the elastic button must be manually pressed to turn on the power supply, which plays the role of power failure protection;

3. Over-voltage power-off function: detect the voltage of the circuit through the over-voltage circuit, and feed it back to the single-chip microcomputer. When the system has a high voltage such as 380V, the single-chip microcomputer stops driving the action circuit, the relay coil loses power, release the contact switch, and the socket stops Work, so that electrical appliances are protected. To restore power, the elastic button must be manually pressed to power on again.

It can be seen that through the socket safety protection device and the safety protection socket provided by the utility model, three types of common safety problems that occur during the use of household appliances can be protected, and the use safety of household appliances is completely protected. It has the energy-saving function of automatic power-off in long-time standby to prevent waste of electric energy.

Description of drawings

Fig. 1 is a circuit diagram of a socket safety protection device in one embodiment of the present invention;

Fig. 2 is a working flowchart of the socket safety protection device in one embodiment of the present invention.

Detailed ways

Embodiment of the utility model is described in detail below in conjunction with accompanying drawing:

Fig. 1 shows the circuit diagram of the socket safety protection device in one of the embodiments of the present utility model, the socket safety protection device is mainly composed of a single-chip microcomputer control circuit, an action circuit 10, a current detection circuit 20 and an overvoltage circuit 30, wherein the single-chip microcomputer control The circuit includes a single-chip microcomputer U2 and a power supply circuit 40. The input terminals of the power supply circuit 40 are respectively connected to the live line L and the neutral line N of the socket power input line, and the output terminals of the power supply circuit 40 are respectively connected to the power supply terminals of the single-chip microcomputer U2.

The action circuit 10 is mainly composed of a relay, a relay drive circuit and an elastic button 11. The relay of this embodiment has two contact switches K12 and K34, and the two contact switches K12 and K34 are respectively connected in series to the live line L of the power input line of the socket. And the neutral line N, and the two contact switches K12, K34 linkage. The purpose of arranging two contact switches is to prevent the live wire L and the neutral wire N of the socket from being reversely connected with the live wire L and the neutral wire N of the power supply, and the safety protection device can also work. The relay driving circuit of this embodiment is composed of a switching transistor Q2, a resistor R14, a resistor R15, and a capacitor C10. The collector of the switching transistor Q2 is connected to one end of the relay coil K1, and the other end of the relay coil K1 is It is connected to the fire wire L of the socket power input line, the base of the switching transistor Q2 is connected to the output terminal P1.2 of the single-chip microcomputer U2 through a resistor R14, and the resistor R15 and the capacitor C10 are connected in parallel to the switching transistor Q2 between the base and collector electrodes. The elastic button 11 is arranged above the contact switches K12, K34 and is linked with the contact switches K12, K34. The elastic button 11 has a return spring. When the elastic button 11 is pressed, the contact switches K12 and K34 can be closed, and when the elastic button 11 is released, the elastic button 11 resets under the action of the return spring.

The current detection circuit 20 is used to detect the working current of the electrical equipment and feed it back to the single chip microcomputer U2. The first terminal of the current detection circuit 20 is connected to the input terminal P1.1 of the single chip microcomputer, the second terminal is connected to the working circuit through the transformer 21, and a current amplification circuit is arranged between the first terminal and the second terminal of the current detection circuit. The current amplifying circuit of this embodiment is mainly composed of a voltage dividing resistor R23, a voltage dividing resistor R24, a diode D14, a diode D15, a capacitor C15, a voltage stabilizing diode D6, a resistor R25 and an amplifier U6.

The overvoltage circuit 30 is used to detect the voltage UA of the circuit and feed it back to the single chip microcomputer U2. The overvoltage circuit 30 is composed of a transient voltage suppression diode D13, a resistor R21, a resistor R22, a capacitor C13 and a capacitor C14. The input terminal of the transient voltage suppression diode D13 is connected to the live line L of the socket power input line, and the transient voltage suppression diode The output end of D13 is connected to one end of the resistor R21, the other end of the resistor R21 is connected to the input end P1.0 of the single-chip microcomputer U2, and the other end is grounded through the parallel connection of the resistor R22, the capacitor C13 and the capacitor C14. During normal operation, the overvoltage circuit 30 is not conducting, and the input terminal P1.0 on the single-chip microcomputer U2 has been receiving a low-level signal; when the grid voltage is suddenly higher than the set threshold, the transient voltage suppression diode in the overvoltage circuit 30 D13 is broken down recoverably, the overvoltage circuit 30 is turned on, the input terminal P1.0 on the single-chip microcomputer U2 receives a high-level signal, the single-chip microcomputer U2 stops driving the action circuit 10, the coil K1 loses power, release the switch, and the safety The protection socket stops working, and the electric equipment is cut off.

The working principle of the socket safety protection device of this embodiment is described below in conjunction with FIG. 2:

When using the safety protection socket of this embodiment, first insert the plug of the electrical equipment into the socket, press the elastic button 11 in the socket, and the socket safety protection device starts to work. The single-chip microcomputer U2 in the circuit drives the action circuit 10 to work, the coil K1 of the relay is electrified, and the contact switches K12 and K34 are attracted to keep the contact switches K12 and K34 in a closed state. When the following situations occur, the single-chip microcomputer U2 stops driving the action circuit 10, the relay coil K1 loses power, the contact switches K12 and K34 are released, and the safety protection socket stops working.

1. When the socket safety protection device works normally, the single-chip microcomputer U2 compares the current I _A input by the current detection circuit 20 with the set current I _B. If the current I _A is less than the current I _B , the internal counter of the single-chip microcomputer U2 starts timing. When the current When the time I _A is less than the current I _B exceeds the set time N (N is generally 60 seconds), it can be judged that the load is in a standby state, and the single-chip microcomputer U2 stops driving the action circuit 10, so that the relay coil K1 loses power, thereby making the contact switch K12 and K34 are disconnected; otherwise, if the current I _A is greater than the current I _B , or the time when the current I _A is smaller than the current I _B is less than the set time, the single-chip microcomputer U2 continues to drive the action circuit 10 to work.

2. When the socket safety protection device works normally, the grid suddenly loses power, the relay coil K1 loses power, and the contact switches K12 and K34 are released, and the safety protection socket stops working.

3. When the socket safety protection device works normally, the single-chip microcomputer U2 compares the voltage U _A input by the overvoltage circuit 30 with the set voltage U _B. If the voltage U _A is greater than the voltage U _B , the single-chip microcomputer U2 stops driving the action circuit 10, and the relay The coil K1 loses power, the contact switches K12 and K34 are released, the safety protection socket stops working, and the electric equipment is powered off.

After the above three situations occurred, the safety protection socket stopped working, and if the power supply needs to be restored, the elastic button 11 must be manually pressed to turn on the power supply again. It can be seen that through the socket safety protection device and the safety protection socket of this embodiment, three types of common safety problems that occur during the use of household appliances can be protected, and the use safety of household appliances is completely protected. The energy-saving function of automatic power-off in standby time to prevent waste of electric energy.

The above are only specific embodiments of the utility model, and do not limit the protection scope of the utility model; any replacement and improvement made on the basis of not violating the concept of the utility model all belong to the protection scope of the utility model.

Claims (8)

1. A kind of socket safety protection device, it is characterized in that: comprise single-chip microcomputer control circuit, action circuit and current detection circuit, described single-chip microcomputer control circuit comprises single-chip microcomputer; Described action circuit comprises relay and elastic button, and described relay and described single-chip microcomputer connected to the output end of the relay, the contact switch of the relay is connected in series with the socket power input line, and the elastic button is associated with the contact switch; the first end of the current detection circuit is connected to the single-chip microcomputer, and the second end is connected to the The working circuit is connected, and a current amplification circuit is set between the first end and the second end of the current detection circuit; the single-chip microcomputer is used to judge whether the load is in a standby state according to the current IA input by the current detection circuit, and when the load is in a standby state state stops driving the relay. 2. The socket safety protection device according to claim 1, characterized in that: the relay has two contact switches, and the two contact switches are respectively connected in series to the live line and the neutral line of the socket power input line, And the two contact switches are linked. 3. The socket safety protection device according to claim 1, characterized in that: the action circuit also includes a relay drive circuit, the relay drive circuit includes a switch transistor, a first resistor, a second resistor and a first capacitor, the The collector of the switch transistor is connected to one end of the relay coil, the other end of the relay coil is connected to the fire wire of the socket power input line, the base of the switch transistor is connected to the output end of the single-chip microcomputer through the first resistor, The second resistor and the first capacitor are connected in parallel between the base and the collector of the switching transistor. 4. The socket safety protection device according to claim 3, wherein the action circuit further includes a diode, which is connected in series between the relay coil and the live wire of the socket power input line. 5. The socket safety protection device according to claim 1, characterized in that: the input end of the power supply circuit of the single-chip microcomputer control circuit is connected to the socket power input line. 6. The socket safety protection device according to any one of claims 1 to 5, characterized in that it also includes an overvoltage circuit, which is used to detect the voltage UA on the power input line of the socket, and convert the voltage to UA is input to the single-chip microcomputer, and the single-chip microcomputer is used to judge whether the power supply voltage is overvoltage according to the voltage UA, and stop driving the relay when the power supply voltage is overvoltage. 7. The socket safety protection device according to claim 6, wherein the overvoltage circuit includes a transient voltage suppression diode, a third resistor, a fourth resistor, a second capacitor and a third capacitor, and the transient The input end of the voltage suppression diode is connected to the live line of the socket power input line, the output end of the transient voltage suppression diode is connected to one end of the third resistor, and the other end of the third resistor is connected to the single chip microcomputer. The input end is connected, and the other path is grounded through the fourth resistor, the second capacitor and the third capacitor connected in parallel. 8. A safety protection socket, comprising a socket body, characterized in that the socket safety protection device according to any one of claims 1 to 7 is arranged in the socket body.

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