CN101859964A - Anti-shock socket circuit - Google Patents

Abstract

The invention discloses an electric shock prevention socket circuit which comprises a power supply unit, a detection unit and a switch unit. The power supply unit is used for providing voltage for the detection unit and the switch unit; the detection unit is used for detecting and judging whether the pins of the plug are correctly inserted into the jacks or not and sending control signals according to the detection; the switch unit receives the control signal sent by the detection unit and controls the power output of the socket according to the control signal. The electric shock prevention socket circuit has good safety and is convenient for users to use.

Description

Anti-shock socket circuit

technical field

The invention relates to a circuit, in particular to an electric shock-proof socket circuit.

Background technique

With the popularization of household appliances, electrical sockets have become a must-have for thousands of households. Because children's curiosity is strong, so tend to take some iron nails, copper wire or other articles toward the hole and the user is often careless and easily produces electric shock when inserting the plug.

For safety, the socket is often provided with a corresponding anti-shock protection mechanism. Chinese patent application No. 200820105388 discloses an electric shock-proof socket, which includes a seat plate, a seat body buckled on the seat plate, a plurality of electrodes and a plurality of insulating blocks. A jack is provided on the seat plate. The electrodes are arranged on the seat body and located below the socket of the seat plate. The insulating block is placed between the jack and the electrodes, and the insulating block is provided with perforations corresponding to the jacks on the seat plate that penetrate up and down. When the plug-in terminal of the plug is not completely inserted into the anti-shock socket, the plug-in terminal only contacts with the insulating block and does not electrically conduct with the anti-shock socket, so that the anti-shock socket can achieve the effect of preventing electric shock.

Another example is that the Chinese patent application number 200720014111 discloses a kind of anti-shock socket, including a shell, a socket, a metal contact piece and a wire, and a circular thread groove is processed corresponding to each socket on the surface of the shell, and the center of the thread groove is the center of the socket; The surface of the groove is threaded to connect the rotating cover, and a pair of sockets are opened on the surface of the rotating cover. There are raised baffles, and the spring connection between the two baffles. When turning on the power, first insert the power plug into the socket on the surface of the rotating cover, squeeze the spring, and turn the rotating cover. When the socket of the rotating cover coincides with the socket of the shell, insert the power plug downward into the socket of the shell and contact the metal contact piece to realize power supply. , and finally achieve the purpose of preventing electric shock.

The above-mentioned socket stopper structure and screw cap socket structure all use a mechanical structure to provide a blocking force to achieve the purpose of preventing electric shock, which is poor in safety and inconvenient for users to use.

Contents of the invention

The main purpose of the present invention is to provide an anti-shock socket circuit arranged in the socket so as to improve the safety of the socket and facilitate the use of users to solve the defects of the above-mentioned background technology.

To achieve the above object, the present invention provides an electric shock-proof socket circuit, which includes a power supply unit, a detection unit and a switch unit. The power supply unit is used to provide voltage for the detection unit and the switch unit; the detection unit is used to detect whether the prongs of the plug are correctly inserted into the jack, and send a control signal accordingly; the switch unit receives the control signal sent by the detection unit, and according to The control signal controls the power output of the socket.

To sum up, the electric shock-proof socket circuit of the present invention is used for detecting and judging whether the prongs of the plug are correctly inserted into the jack through the detection unit, and sends a control signal accordingly, and the switch unit receives the control signal and controls the conduction of the power supply according to the control signal. On and off, so as to achieve the purpose of preventing electric shock, which is safe and convenient for users to use.

Description of drawings

Fig. 1 is a circuit diagram of an embodiment of the electric shock-proof socket circuit of the present invention.

The reference numerals in the above-mentioned accompanying drawings are explained as follows:

100 electric shock-proof socket circuit

1 Power supply unit 11 Step-down circuit

12 rectifier filter circuit 13 voltage regulator circuit

C1 step-down capacitor R1 first resistor

R2 second resistor BD1 first rectifier diode

BD2 second rectifier diode BD3 third rectifier diode

BD4 fourth rectifier diode C2 filter capacitor

D1 first Zener diode D2 second Zener diode

2 detection unit 21 light emission unit

22 Light receiving unit E1 first light-emitting element

E2 Second light-emitting element E3 Third light-emitting element

T1 first photosensitive element T2 second photosensitive element

T3 third photosensitive element R3 third resistor

R4 fourth resistor R5 fifth resistor

3 switch unit Q1 first switch element

Q2 second switching element S1 inductive switching element

D3 Steering current diode D4 Light emitting unit

R6 sixth resistor R7 seventh resistor

R8 Eighth resistor Lin Power input live wire terminal

Nin Power input neutral terminal Lout Power output live terminal

Nout power output neutral terminal

Detailed ways

In order to describe in detail the technical content, structural features, objectives and effects of the present invention, the following will be described in detail in conjunction with the embodiments and accompanying drawings.

Please refer to FIG. 1 , the electric shock prevention socket circuit 100 of the present invention includes a power supply unit 1 , a detection unit 2 and a switch unit 3 . The power supply unit 1 includes a step-down circuit 11 , a rectification filter circuit 12 and a voltage stabilization circuit 13 . The step-down circuit 11 includes a step-down capacitor C1 and a first resistor R1 connected in parallel. One end of the step-down capacitor C1 and the first resistor R1 is electrically connected to the power input line terminal Lin, and the step-down capacitor C1 and the first resistor The other end of R1 is electrically connected to the rectification and filtering circuit 12 . The step-down circuit 11 is used for stepping down the external power supply.

The rectifying and filtering circuit 12 includes a first rectifying diode BD1 , a second rectifying diode BD2 , a third rectifying diode BD3 and a fourth rectifying diode BD4 connected to each other. The cathode of the first rectifier diode BD1 is electrically connected to the step-down capacitor C1 and one end of the first resistor R1, the anode of the first rectifier diode BD1 and the anode of the third rectifier diode BD3 are electrically connected to the ground; the third rectifier diode The cathode of BD3 and the anode of the fourth rectifier diode BD4 are electrically connected to the power input neutral terminal Nin; the cathode of the second rectifier diode BD2 and the cathode of the fourth rectifier diode BD4 are electrically connected to the voltage stabilizing circuit 13 . The cathode of the second rectifier diode BD2 and the cathode of the fourth rectifier diode BD4 are also electrically connected to the anode of a filter capacitor C2, and the other end of the filter capacitor C2 is electrically connected to the ground, and the filter capacitor C2 is used for rectifying and filtering the circuit 12 The output voltage is filtered.

The voltage stabilizing circuit 13 is two first voltage stabilizing diodes D1 and a second voltage stabilizing diode D2 connected in parallel. A second resistor R2 is connected between the rectifying filter circuit 12 and the voltage stabilizing circuit 13, one end of the second resistor R2 is connected to the negative pole of the second rectifying diode BD2 and the negative pole of the fourth rectifying diode BD4, and the other end is connected to the negative pole of the fourth rectifying diode BD4. A Zener diode D1 is connected to the second Zener diode D2. The voltage stabilizing circuit 13 stabilizes the voltage output by the rectifying and filtering circuit 12 . The power supply unit 1 adjusts the input power and outputs 12 volts for use by the detection unit 2 and the switch unit 3 .

The detection unit 2 includes a light emitting unit 21 and a light receiving unit 22 . The light emitting unit 21 includes a first light emitting element E1 , a second light emitting element E2 and a third light emitting element E3 connected in parallel. One end of the light emitting unit 21 is grounded, and the other end is connected to a third resistor R3, and the other end of the third resistor R3 is electrically connected to one end of the second Zener diode D2. In this example, the first light emitting element E1 , the second light emitting element E2 and the third light emitting element E3 are infrared emitters.

The light receiving unit 22 includes a first photosensitive element T1, a second photosensitive element T2 and a third photosensitive element T3 connected in parallel, so that the first photosensitive element T1, the second photosensitive element T2 and the third photosensitive element T3 The working state change mode before and after the plug is correctly inserted is the same, that is, both change from the on state to the off state. One end of the light receiving unit 22 is connected to a fourth resistor R4, and the other end of the fourth resistor R4 is electrically connected to one end of the second Zener diode D2; the other end of the light receiving unit 22 is connected to a fifth resistor R5. The other end of the five resistor R5 is grounded. The first photosensitive element T1, the second photosensitive element T2 and the third photosensitive element T3 cooperate with the first light emitting element E1, the second light emitting element E2 and the third light emitting element E3 respectively, and the matching light emitting element and photosensitive element are located at Opposite sides of a socket in a socket. In this embodiment, the first photosensitive element T1 , the second photosensitive element T2 and the third photosensitive element T3 are photoresistors.

The switch unit 3 includes a current guiding diode D3, a light emitting unit D4, a first switch element Q1, a second switch element Q2, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8 and an Inductive switching element S1. In this embodiment, the first switching element Q1 and the second switching element Q2 are transistors, one end of the seventh resistor R7 is connected to the collector of the second switching element Q2, and the other end is connected to the emitter of the second switching element Q2 and electrically The polarity is connected to the ground, and the base of the second switching element Q2 is connected to one end of the fifth resistor R5. One end of the sixth resistor R6 is electrically connected to the collector of the second switching element Q2, the base of the first switching element Q1, and one end of the seventh resistor R7, and the other end is electrically connected to one end of the second Zener diode D2. The base of the first switching element Q1 is connected to one end of the seventh resistor R7, the emitter is grounded, the collector is electrically connected to one end of the current guiding diode D3, and the other end of the guiding current diode D3 is electrically connected to the second Zener diode D2. The guiding current diode D3 is used to guide the current flowing back when the first switching element Q1 is turned off, so as to protect the first switching element Q1.

In this embodiment, the inductive switching element S1 is an electromagnetic relay. One terminal of the switch in the inductive switching element S1 is electrically connected to the power input live terminal Lin, and the other terminal is connected to one terminal of the eighth resistor R8. One end of the eighth resistor R8 is connected to the power output line terminal Lout, and the other end is electrically connected to the light emitting unit D4. The other end of the light emitting unit D4 is connected to the power output neutral terminal Nout and is electrically connected to the power input neutral terminal Nin. When the plug is inserted into the socket, it is electrically connected to the pins of the external plug through the power output live wire end Lout and the power output neutral wire end Nout. In this embodiment, the light-emitting unit D4 is a light-emitting diode. The light-emitting unit D4 emits bright light when the inductive switch element S1 is in the conduction state due to power excitation, and thus serves as a switch indicator light.

When the plug is not inserted into the jack of the socket, the detection light emitted by the first light-emitting element E1, the second light-emitting element E2 and the third light-emitting element E3 are all detected by the corresponding first photosensitive element T1, second photosensitive element T2 and The third photosensitive element T3 receives it, so that the fifth resistor R5 has a current to pass through, and then a high-voltage control signal can be sent to the second switch element Q2, and the high-voltage control signal drives the second switch element Q2 to be turned on, so that the second switch element Q2 is turned on. A switch element Q1 is disconnected, so the inductive switch element S1 is in an off state due to no power excitation, and the power output live wire terminal Lout has no power output, and the socket has no power output. When less than three pins of the plug are inserted into the socket (the pins are incorrectly inserted into the jack of the socket or inserted by a foreign object), current flows through the fifth resistor R5, and thus the socket has no power output.

When the plug is correctly inserted into the socket, the detection light emitted by the corresponding first light-emitting element E1, the second light-emitting element E2 and the third light-emitting element E3 is blocked by the terminal of the plug, so the fifth resistor R5 has no current passing through, and the second The switch unit Q2 is in the cut-off state after receiving a low-voltage control signal, so that the seventh resistor R7 has a current passing through it and makes the first switch element Q1 conduct, so the inductive switch element S1 is in the conduction state due to the power excitation. , power output live wire terminal Lout has power output, then the socket has power output.

In summary, the anti-shock socket circuit 100 of the present invention sends and receives detection light through the detection unit 2 to detect and judge whether the pins of the plug are correctly inserted into the jacks of the socket, so as to control the power supply of the socket to be turned on or off, thus achieving anti-shock. The purpose of electric shock, so that the socket is safe and convenient for users to use.

Claims (4)

1. electric shock preventing socket circuit, it is characterized in that: include a power-supply unit, a detecting unit and a switch element, power-supply unit is used to detecting unit and switch element that voltage is provided; This detecting unit is used for detecting the pin of judging plug and whether correctly inserts jack, and transmits control signal in view of the above; Switch element receives the control signal that detecting unit sends, and exports according to the power supply of this control signal control socket.

2. electric shock preventing socket circuit according to claim 1, it is characterized in that: described detecting unit includes an Optical Transmit Unit and a light receiving unit, wherein, Optical Transmit Unit includes some light-emitting components, and light receiving unit includes some photo-sensitive cells that cooperate with a light-emitting component respectively, these some photo-sensitive cells are identical in the operating state mapping mode of plug before and after correctly planting, and the light-emitting component that matches and photo-sensitive cell are arranged at the relative both sides of a jack.

3. electric shock preventing socket circuit according to claim 1, it is characterized in that: described switch element includes an inductance type switch element, one first switch element and a second switch element, when this first switch element conducting, and this second switch element is when disconnecting, this inductance type switch element disconnects, this anti-electric shock socket non-transformer output; And disconnect when this first switch element, and during this second switch element conductive, this inductance type switch element conducting, this anti-electric shock socket has power supply output.

4. electric shock preventing socket circuit according to claim 1 is characterized in that: described power-supply unit includes a reduction voltage circuit, a current rectifying and wave filtering circuit and a voltage stabilizing circuit, and reduction voltage circuit can carry out step-down with the voltage of outside input; Current rectifying and wave filtering circuit can convert the alternating current of reduction voltage circuit output to behind the direct current and voltage is carried out filtering; Voltage stabilizing circuit can carry out voltage stabilizing with the voltage of current rectifying and wave filtering circuit output.

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