Socket circuit and socket having the same

Abstract

The present invention discloses a socket circuit and a socket having the socket circuit, wherein the socket circuit includes an auxiliary power module, a power control module, a switch module, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a second switch tube Q2, a third switch tube Q3, a fourth switch tube Q4, a first diode D1, a second diode D2, a third diode D3, a relay RL1, a photocoupler IC1, a first wire connecting part CN1, and a second wire connecting part. Through the connection and coordination of the above components, the safety performance of the socket can be effectively improved.

Description

Technical Field

[0001] This invention relates to the technical field of power supply devices, and particularly to a socket circuit and a socket having the same. Background Art

[0002] Sockets are typically connected to the live and neutral wires of an external power source, and some may also be connected to the ground wire. Sockets usually have prongs for connecting to the power supply of a load. When no load is connected, these prongs are exposed, making them vulnerable to contact and potential injury. Furthermore, overload or a faulty ground wire can easily lead to electric shock if the external power supply is not disconnected promptly. However, in current technology, most switches and sockets use mechanical contact to switch current on and off. While this structure is simple and inexpensive, it lacks sufficient safety. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a socket circuit that can effectively improve the safety performance of the socket.

[0004] The present invention also proposes a socket having the above-described socket circuit.

[0005] A socket circuit according to a first aspect embodiment of the present invention includes: an auxiliary power supply module, a power control module, a switch module, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a second switch Q2, a third switch Q3, a fourth switch Q4, a first diode D1, a second diode D2, a third diode D3, a relay RL1, an optocoupler IC1, a first wire connection portion CN1, and a second wire connection portion. The auxiliary power supply module is connected to the input terminal of the third switch Q3, one end of the first resistor R1, and one end of the power control module, respectively. The other end of the first resistor R1 is connected to the anode of the first diode D1. One end of the switch of electrical appliance RL1 is connected to the live wire, and the other end is connected to the first wire connection part CN1. The input terminal of the coil of relay RL1 is connected to the auxiliary power supply module, and the output terminal of the coil of relay RL1 is connected to the input terminal of the fourth switch transistor Q4. The output terminal of the fourth switch transistor Q4 is grounded. The control terminal of the fourth switch transistor Q4 is connected to one end of the switch module, and the other end of the switch module is connected to the power control module. The output terminal of the third switch transistor Q3 is connected to one end of the third resistor R3, and the other end of the third resistor R3 is connected to the anode of the second diode D2. The cathode of the second diode D2 is connected to the switch of relay RL1 and the first wire connection part CN1. Between the connections of CN1, the control terminal of the third switch Q3 is connected to the input terminal of the second switch Q2, the output terminal of the second switch Q2 is grounded, and the control terminal of the second switch Q2 is connected between the first resistor R1 and the anode of the first diode D1. The two ends of the second resistor R2 are respectively connected to the input terminal and the control terminal of the third switch Q3. The power control module is also connected to the emitter of the optocoupler IC1. One end of the fourth resistor R4 is grounded, and the other end is connected between the power control module and the emitter of the optocoupler IC1. The collector of the optocoupler IC1 is connected to the auxiliary power module, and the anode of the optocoupler IC1 is connected to the... One end of the fifth resistor R5 is connected to the cathode of the optocoupler IC1 and one end of the sixth resistor R6. The connection line between the cathode of the optocoupler IC1 and one end of the sixth resistor R6 is also grounded. The other end of the fifth resistor R5 is connected between the cathode of the optocoupler IC1 and one end of the sixth resistor R6. The other end of the sixth resistor R6 is connected to the anode of the third diode D3. The cathode of the third diode D3 is connected between the switch of the relay RL1 and the connection line of the first wire connection CN1. One end of the second wire connection is connected to the neutral wire, and the other end is connected between the connection line between the fifth resistor R5 and the anode of the optocoupler IC1.

[0006] The socket circuit according to an embodiment of the present invention has at least the following beneficial effects: the live wire input is connected to the input terminal of relay RL1, and the normally open output of relay RL1 is connected to the first wire connection part CN1. The neutral wire is connected to the second wire connection part, which is also connected to the anode of the input diode of optocoupler IC1, with the cathode grounded. The fifth resistor R5 is connected in parallel with the input terminal of optocoupler IC1 to provide bias voltage. The cathode of optocoupler IC1 is connected to the sixth resistor R6, which is a current-limiting resistor. The sixth resistor R6 is connected in series with the anode of the third diode D3, and the cathode of the third diode D3 is connected to the input live wire. The collector of the output transistor of optocoupler IC1 is connected to the voltage, and the emitter is connected to the load sampling fourth resistor R4. The load detection output signal is connected to the emitter of optocoupler IC1, and the load detection output signal drives the fourth switching transistor Q4. The voltage is connected to the input terminal of the third switch Q3. The output terminal of the third switch Q3 is connected to the third resistor R3. The third resistor R3 is connected to the anode of the second diode D2. The cathode of the second diode D2 is connected to the normally open output of the relay RL1. The second resistor R2 is the bias resistor between the control terminal and the input terminal of the third switch Q3. The control terminal of the third switch Q3 is connected to the input terminal of the second switch Q2. The voltage is connected to the first current-limiting resistor R1. The output terminal of the first resistor R1 is connected to the anode of the first isolation diode D1. The cathode of the first diode D1 is connected to the normally open output terminal of the relay RL1. The output terminal of the first resistor R1 is also connected to the control terminal of the second switch Q2. The socket switch signal is connected to the control terminal of the fourth switch Q4. The input terminal of the fourth switch Q4 is grounded and connected to the coil of the relay.

[0007] When the circuit is connected and energized normally, that is, the live wire and neutral wire are connected, the auxiliary power module outputs auxiliary voltage. If no load is inserted into the socket hole, that is, the first wire connection part CN1 and the second wire connection part are not connected to the load, the load detection circuit auxiliary power module, the third switch Q3, the third resistor R3, the second diode D2, the first wire connection part CN1, the second wire connection part, the optocoupler IC1, and the fourth resistor R4 are all open. Because the first wire connection part CN1 and the second wire connection part are open, the optocoupler IC1 has no current, and the voltage of the sampling resistor R4 is zero. At this time, there is no load detection output signal, the relay RL1 controls the fourth switch Q4 to not turn on, the relay RL1 does not operate, the live wire is open, the socket is not energized, and even if the live wire socket is touched at this time, there will be no electric shock.

[0008] When the circuit is normally powered, when a load is inserted, the socket switch signal is turned on, meaning the fourth switch Q4 is saturated and conducting. The output of the second switch Q2 is pulled down to ground. If the load is not overloaded or short-circuited, the control terminal of the second switch Q2 receives the turn-on voltage and turns on, as does the third switch Q3. The load detection circuit then operates, performing load detection. Ultimately, current flows through the input of the optocoupler IC1. The voltage detected by the fourth resistor R4 drives the relay to control the fourth switch Q4, turning on the relay RL1. The live wire voltage is connected to the first wire connection CN1, supplying power to the load. At this time, the auxiliary power module Q3, the third resistor R3, and the second diode D2 of the load detection circuit are not needed and are turned off. The load detection signal is maintained by the current generated by the loop between the neutral wire, the sixth resistor R6 and the seventh resistor R7 at the input of the optocoupler IC1, the third diode D3, and the live wire.

[0009] If the load is overloaded or short-circuited, the circuit of the auxiliary power module, the first resistor R1, the first diode D1, the load, and the photodiode of the optocoupler IC1 will divide the voltage. At this time, because the load has a small resistance, the control terminal voltage of the second switch Q2 is insufficient and it will turn off, which in turn turns off the third switch Q3. The detection circuit is not open and the load detection signal cannot be obtained. The relay RL1 does not work, and the socket is de-energized, thus obtaining overload or short-circuit protection.

[0010] This design effectively improves the safety performance of the socket.

[0011] According to some embodiments of the present invention, the second wire connection portion includes a second connection unit CN2, the second connection unit CN2 is provided with a first connection end, a second connection end and a third connection end, the first connection end and the second connection end are arranged in parallel and connected to the neutral wire, and the third connection end is connected between the fifth resistor R5 and the connection line of the anode of the optocoupler IC1.

[0012] According to some embodiments of the present invention, the second wire connection portion includes a second connection unit CN2 and a third connection unit CN3. The second connection unit CN2 is connected to the neutral wire, one end of the third connection unit CN3 is connected to the ground wire, and the other end of the third connection unit CN3 is connected between the fifth resistor R5 and the connection line of the anode of the optocoupler IC1.

[0013] According to some embodiments of the present invention, the second connection unit CN2 is provided with a first connection end and a second connection end, the first connection end and the second connection end are arranged in parallel and connected to the neutral wire.

[0014] According to some embodiments of the present invention, the third connection unit CN3 is provided with a first connection terminal, a second connection terminal and a third connection terminal. The first connection terminal and the second connection terminal are connected in parallel and connected to the ground wire. The third connection terminal is connected between the fifth resistor R5 and the connection line of the anode of the optocoupler IC1.

[0015] According to some embodiments of the present invention, a seventh resistor R7 is connected in series between the sixth resistor R6 and the third diode D3.

[0016] According to some embodiments of the present invention, the second switch Q2 and the fourth switch Q4 are NMOS transistors or N-type transistors.

[0017] According to some embodiments of the present invention, the third switch Q3 is a PMOS transistor or a P-type transistor.

[0018] According to some embodiments of the present invention, the auxiliary power module outputs a first power supply VCC1, a second power supply VCC2 and a third power supply VCC3 respectively.

[0019] The socket according to a second aspect embodiment of the present invention includes the socket circuit described above.

[0020] The socket according to an embodiment of the present invention has at least the following beneficial effects: Since the socket uses the above-described socket circuit, the live wire input is connected to the input terminal of relay RL1, and the normally open output of relay RL1 is connected to the first wire connection part CN1. The neutral wire is connected to the second wire connection part, which is also connected to the anode of the input diode of optocoupler IC1. The cathode is grounded. The fifth resistor R5 is connected in parallel with the input terminal of optocoupler IC1 to provide bias voltage. The cathode of optocoupler IC1 is connected to the sixth resistor R6, which is a current-limiting resistor. The sixth resistor R6 is connected in series with the anode of the third diode D3, and the cathode of the third diode D3 is connected to the input live wire. The collector of the output transistor of optocoupler IC1 is connected to the voltage, and the emitter is connected to the load sampling fourth resistor R4. The load detection output signal is connected to the emitter of optocoupler IC1, and the load detection output signal drives the fourth switching transistor Q4. The voltage is connected to the input terminal of the third switch Q3. The output terminal of the third switch Q3 is connected to the third resistor R3. The third resistor R3 is connected to the anode of the second diode D2. The cathode of the second diode D2 is connected to the normally open output of the relay RL1. The second resistor R2 is the bias resistor between the control terminal and the input terminal of the third switch Q3. The control terminal of the third switch Q3 is connected to the input terminal of the second switch Q2. The voltage is connected to the first current-limiting resistor R1. The output terminal of the first resistor R1 is connected to the anode of the first isolation diode D1. The cathode of the first diode D1 is connected to the normally open output terminal of the relay RL1. The output terminal of the first resistor R1 is also connected to the control terminal of the second switch Q2. The socket switch signal is connected to the control terminal of the fourth switch Q4. The input terminal of the fourth switch Q4 is grounded and connected to the coil of the relay.

[0021] When the circuit is connected and energized normally, that is, the live wire and neutral wire are connected, the auxiliary power module outputs auxiliary voltage. If no load is inserted into the socket hole, that is, the first wire connection part CN1 and the second wire connection part are not connected to the load, the load detection circuit auxiliary power module, the third switch Q3, the third resistor R3, the second diode D2, the first wire connection part CN1, the second wire connection part, the optocoupler IC1, and the fourth resistor R4 are all open. Because the first wire connection part CN1 and the second wire connection part are open, the optocoupler IC1 has no current, and the voltage of the sampling resistor R4 is zero. At this time, there is no load detection output signal, the relay RL1 controls the fourth switch Q4 to not turn on, the relay RL1 does not operate, the live wire is open, the socket is not energized, and even if the live wire socket is touched at this time, there will be no electric shock.

[0022] When the circuit is normally powered, when a load is inserted, the socket switch signal is turned on, meaning the fourth switch Q4 is saturated and conducting. The output of the second switch Q2 is pulled down to ground. If the load is not overloaded or short-circuited, the control terminal of the second switch Q2 receives the turn-on voltage and turns on, as does the third switch Q3. The load detection circuit then operates, performing load detection. Ultimately, current flows through the input of the optocoupler IC1. The voltage detected by the fourth resistor R4 drives the relay to control the fourth switch Q4, turning on the relay RL1. The live wire voltage is connected to the first wire connection CN1, supplying power to the load. At this time, the auxiliary power module Q3, the third resistor R3, and the second diode D2 of the load detection circuit are not needed and are turned off. The load detection signal is maintained by the current generated by the loop between the neutral wire, the sixth resistor R6 and the seventh resistor R7 at the input of the optocoupler IC1, the third diode D3, and the live wire.

[0023] If the load is overloaded or short-circuited, the circuit of the auxiliary power module, the first resistor R1, the first diode D1, the load, and the photodiode of the optocoupler IC1 will divide the voltage. At this time, because the load has a small resistance, the control terminal voltage of the second switch Q2 is insufficient and it will turn off, which in turn turns off the third switch Q3. The detection circuit is not open and the load detection signal cannot be obtained. The relay RL1 does not work, and the socket is de-energized, thus obtaining overload or short-circuit protection.

[0024] This design effectively improves the safety performance of the socket.

[0025] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0027] Figure 1 This is a circuit diagram of the socket circuit according to the first embodiment of the present invention;

[0028] Figure 2 This is a circuit diagram of a socket circuit according to a second embodiment of the present invention. DETAILED DESCRIPTION

[0029] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0030] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0031] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0032] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0033] The first aspect of this invention provides a socket circuit, including an auxiliary power supply module, a power control module, a switch module, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a second switch Q2, a third switch Q3, a fourth switch Q4, a first diode D1, a second diode D2, a third diode D3, a relay RL1, an optocoupler IC1, a first wire connection part CN1, and a second wire connection part. The auxiliary power supply module is connected to the input terminal of the third switch Q3, one end of the first resistor R1, and one end of the power control module, respectively. The other end of the first resistor R1 is connected to the first diode... The anode of D1 is connected; one end of the switch of relay RL1 is connected to the live wire, and the other end is connected to the first wire connection part CN1; the input terminal of the coil of relay RL1 is connected to the auxiliary power supply module; the output terminal of the coil of relay RL1 is connected to the input terminal of the fourth switch Q4; the output terminal of the fourth switch Q4 is grounded; the control terminal of the fourth switch Q4 is connected to one end of the switch module; the other end of the switch module is connected to the power control module; the output terminal of the third switch Q3 is connected to one end of the third resistor R3; the other end of the third resistor R3 is connected to the anode of the second diode D2; the cathode of the second diode D2 is connected to the switch of relay RL1 and the first wire connection part. Between the connections of CN1, the control terminal of the third switch Q3 is connected to the input terminal of the second switch Q2, the output terminal of the second switch Q2 is grounded, and the control terminal of the second switch Q2 is connected between the first resistor R1 and the anode of the first diode D1. The two ends of the second resistor R2 are connected to the input terminal and the control terminal of the third switch Q3, respectively. The power control module is also connected to the emitter of the optocoupler IC1. One end of the fourth resistor R4 is grounded, and the other end is connected between the power control module and the emitter of the optocoupler IC1. The collector of the optocoupler IC1 is connected to the auxiliary power module, and the anode of the photodiode of the optocoupler IC1 is connected to the fifth resistor R5. One end of the optocoupler IC1 is connected to the cathode of the optocoupler IC1 and one end of the sixth resistor R6. The connection between the cathode of the photodiode of the optocoupler IC1 and one end of the sixth resistor R6 is also grounded. The other end of the fifth resistor R5 is connected between the cathode of the photodiode of the optocoupler IC1 and one end of the sixth resistor R6. The other end of the sixth resistor R6 is connected to the anode of the third diode D3. The cathode of the third diode D3 is connected between the switch of the relay RL1 and the connection between the first wire connection CN1. One end of the second wire connection is connected to the neutral wire, and the other end is connected between the fifth resistor R5 and the connection between the anode of the photodiode of the optocoupler IC1.

[0034] The live wire input is connected to the input terminal of relay RL1, and the normally open output of relay RL1 is connected to the first wire connection CN1. The neutral wire is connected to the second wire connection, which is also connected to the anode of the input diode of optocoupler IC1. The cathode is grounded. The fifth resistor R5 is connected in parallel with the input terminal of optocoupler IC1 to provide bias voltage. The cathode of optocoupler IC1 is connected to the sixth resistor R6, which is a current-limiting resistor. The sixth resistor R6 is connected in series with the anode of the third diode D3, and the cathode of the third diode D3 is connected to the input live wire. The collector of the output transistor of optocoupler IC1 is connected to the voltage, and the emitter is sampled with the load by the fourth resistor R4. The load detection output signal is connected to the emitter of optocoupler IC1, and the load detection output signal drives the fourth switching transistor Q4. The voltage is connected to the input terminal of the third switching transistor Q3. The output terminal of the third switching transistor Q3 is connected to the third resistor R3. The third resistor R3 is connected to the anode of the second diode D2. The cathode of the second diode D2 is connected to the normally open output of the relay RL1. The second resistor R2 is the bias resistor between the control terminal and the input terminal of the third switching transistor Q3. The control terminal of the third switching transistor Q3 is connected to the input terminal of the second switching transistor Q2. The voltage is connected to the first current-limiting resistor R1. The output terminal of the first resistor R1 is connected to the anode of the first isolation diode D1. The cathode of the first diode D1 is connected to the normally open output terminal of the relay RL1. The output terminal of the first resistor R1 is also connected to the control terminal of the second switching transistor Q2. The socket switch signal is connected to the control terminal of the fourth switching transistor Q4. The input terminal of the fourth switching transistor Q4 is grounded and connected to the coil of the relay. In addition, the switch module can be equipped with a touch switch. Only when a touch signal is input can the power control module output a socket switch output signal to the fourth switching transistor Q4 through the switch module.

[0035] Reference Figure 1 In some specific embodiments of the present invention, the second wire connection portion includes a second connection unit CN2. The second connection unit CN2 is provided with a first connection end, a second connection end, and a third connection end. The first connection end and the second connection end are connected in parallel and connected to the neutral wire. The third connection end is connected between the fifth resistor R5 and the connection line of the anode of the optocoupler IC1. This allows for application to two-hole sockets, i.e., sockets without a ground wire connection.

[0036] At this time, when the circuit is connected and the power is normal, that is, the live wire and the neutral wire are connected, the auxiliary power module starts to work. If no load is inserted into the socket hole, the load detection circuit auxiliary power module, the third switch Q3, the third resistor R3, the second diode D2, the first wire connection part CN1, the second connection unit CN2, the optocoupler IC1, and the fourth resistor R4 are all open. Because the first wire connection part CN1 and the second connection unit CN2 are open, the optocoupler IC1 has no current, and the voltage of the sampling resistor R4 is zero. At this time, there is no load detection output signal, the power control module has no voltage output, the switch module does not work, the socket switch output signal is low level, the relay RL1 controls the fourth switch Q4 not to turn on, the relay RL1 does not act, the live wire is open, the socket has no power, even if the live wire socket is touched at this time, there will be no electric shock.

[0037] When the circuit is normally energized, if a load is inserted and there is no overload or short circuit, the control terminal of the second switch Q2 receives the turn-on voltage, and the second switch Q2 conducts. The load detection circuit operates, and the circuit performs load detection. Ultimately, current flows through the input terminal of the optocoupler IC1. The voltage detected by the fourth resistor R4 drives the power control module, and the voltage output is given to the switching module. The switching module operates and outputs a high-level socket switch signal to drive the relay to control the fourth switch Q4. The relay RL1 conducts, and the live wire voltage is connected to the live wire socket (first wire connection part CN1), supplying power to the load. At this time, the load detection signal is maintained by the current generated by the neutral wire, the input terminal of the optocoupler IC1, the sixth resistor R6, the seventh resistor R7, the third diode D3, and the live wire.

[0038] If the load is overloaded or short-circuited, the circuit of the auxiliary power module, the first resistor R1, the first diode D1, the load, and the photodiode of the optocoupler IC1 will divide the voltage. At this time, because the load's apparent resistance is small, the control terminal voltage of the second switch Q2 is insufficient and it will turn off, thereby turning off the third switch Q3. The detection circuit will not be open, and no load detection signal can be obtained. The power control module will have no voltage output, the switch module will not work, the socket switch output signal will be low, the relay RL1 will not work, and the socket will have no power, thus obtaining overload or short-circuit protection.

[0039] Reference Figure 2In some specific embodiments of the present invention, the second wire connection portion includes a second connection unit CN2 and a third connection unit CN3. The second connection unit CN2 is connected to the neutral wire, one end of the third connection unit CN3 is connected to the ground wire, and the other end of the third connection unit CN3 is connected between the fifth resistor R5 and the anode of the optocoupler IC1. The second connection unit CN2 is provided with a first connection end and a second connection end, which are connected in parallel and connected to the neutral wire. The third connection unit CN3 is provided with a first connection end, a second connection end, and a third connection end, which are connected in parallel and connected to the ground wire. The third connection end is connected between the fifth resistor R5 and the anode of the optocoupler IC1. Thus, it can be applied to a three-hole socket, i.e., a socket with a ground wire connection.

[0040] At this time, when the circuit is connected and the power is normal, that is, the live wire, neutral wire, and ground wire are connected, the auxiliary power module works. If no load is inserted into the socket hole, that is, the first wire connection part CN1, the second connection unit CN2, and the third connection unit CN3, the load detection circuit auxiliary power module, the third switch Q3, the third resistor R3, the second diode D2, the first wire connection part CN1, the second connection unit CN2, the third connection unit CN3, the optocoupler IC1, and the fourth resistor R4 are open. Because the first wire connection part CN1, the second connection unit CN2, and the third connection unit CN3 are open, the optocoupler IC1 has no current, the voltage of the sampling resistor R4 is zero, there is no load detection output signal, the power control module has no voltage output, the switch module does not work, the socket switch output signal is low level, the fourth switch Q4 is not turned on, the relay RL1 does not act, the live wire is open, and the socket has no power. Even if you touch the live wire socket at this time, you will not get an electric shock.

[0041] When the circuit is powered and a load is inserted, if the ground wire is faulty, CN3 of the load detection circuit will be open and will not work. At this time, there will be no load detection output signal, the power control module will have no voltage output, the switch module will not work, the socket switch output signal will be low, the fourth switch Q4 will not be turned on, and the socket will have no power output, thus achieving ground wire detection and protection, improving the safety of electrical equipment. If the live wire, neutral wire, and ground wire are properly connected, and the load is not overloaded or short-circuited, the control terminal of the second switch Q2 will receive the turn-on voltage, and the second switch Q2 will conduct. The load detection circuit will work, and the circuit will perform load detection. Finally, current will flow through the input terminal of the optocoupler IC1. The fourth resistor R4 detects the voltage to drive the power control module, and the voltage output is given to the switch module. The switch module will work and output a high-level socket switch signal to drive the relay to control the fourth switch Q4. The relay RL1 will conduct, the live wire voltage will be connected to the live wire socket, and the load will be powered. At this time, the load detection signal is maintained by the current generated from the neutral wire, ground wire, input terminal of optocoupler IC1, sixth resistor R6, seventh resistor R7, third diode D3, and live wire. If a ground fault occurs after the load is powered on, the load detection circuit will be open and no load signal will be detected. Relay RL1 will be turned off, and there will be no voltage output, thus realizing dynamic ground wire detection and protection, improving the safety of electrical equipment.

[0042] If the load is overloaded or short-circuited, the circuit of the auxiliary power module, the first resistor R1, the first diode D1, the load, and the photodiode of the optocoupler IC1 will divide the voltage. At this time, because the load has a small resistance, the control terminal voltage of the second switch Q2 is insufficient and it will turn off, which in turn turns off the third switch Q3. The detection circuit is not open and the load detection signal cannot be obtained. The relay RL1 does not work, and the socket is de-energized, thus obtaining overload or short-circuit protection.

[0043] In some specific embodiments of the present invention, a seventh resistor R7 is connected in series between the sixth resistor R6 and the third diode D3, which can increase the current limiting and voltage dividing effect of the circuit.

[0044] In some specific embodiments of the present invention, the second switch Q2 and the fourth switch Q4 are NMOS transistors or N-type transistors. The third switch Q3 is a PMOS transistor or a P-type transistor. The auxiliary power supply module outputs a first power supply VCC1, a second power supply VCC2, and a third power supply VCC3, which may be the same or different voltages.

[0045] In some specific embodiments of the present invention, the number of connection terminals of the wire connection portion is not limited to the above-mentioned number, and the number can be increased to improve the connectivity characteristics.

[0046] A second aspect of the invention also provides a socket that includes the socket circuit described above.

[0047] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A socket circuit, characterized in that: include: Auxiliary power supply module, power supply control module, switch module, first resistor R1, second resistor R2, third resistor R3, fourth resistor R4, fifth resistor R5, sixth resistor R6, second switch tube Q2, third switch tube Q3, fourth switch tube Q4, first diode D1, second diode D2, third diode D3, relay RL1, photocoupler IC1, first wire connection part CN1, second wire connection part, the auxiliary power supply module is respectively connected to the input end of the third switch tube Q3, one end of the first resistor R1, and one end of the power supply control module, the other end of the first resistor R1 is connected to the anode of the first diode D1, and one end of the switch of the relay RL1 is connected to the live wire, The other end is connected to the first wire connection part CN1, the input end of the coil of the relay RL1 is connected to the auxiliary power module, the output end of the coil of the relay RL1 is connected to the input end of the fourth switch tube Q4, the output end of the fourth switch tube Q4 is grounded, the control end of the fourth switch tube Q4 is connected to one end of the switch module, the other end of the switch module is connected to the power control module, the output end of the third switch tube Q3 is connected to one end of the third resistor R3, the other end of the third resistor R3 is connected to the anode of the second diode D2, and the cathode of the second diode D2 is connected between the switch of the relay RL1 and the connection line of the first wire connection part CN1, The control end of the third switch tube Q3 is connected to the input end of the second switch tube Q2, the output end of the second switch tube Q2 is grounded, the control end of the second switch tube Q2 is connected between the first resistor R1 and the anode connection of the first diode D1, the two ends of the second resistor R2 are respectively connected to the input end and the control end of the third switch tube Q3, the power control module is also connected to the emitter of the photocoupler IC1, one end of the fourth resistor R4 is grounded, and the other end is connected between the power control module and the emitter of the photocoupler IC1, the collector of the photocoupler IC1 is connected to the auxiliary power module, and the anode of the photocoupler IC1 is connected to the fifth resistor R4. One end of the fifth resistor R5 is connected, the cathode of the photocoupler IC1 is connected to one end of the sixth resistor R6, the connection line between the cathode of the photocoupler IC1 and one end of the sixth resistor R6 is also grounded, the other end of the fifth resistor R5 is connected between the connection line between the cathode of the photocoupler IC1 and one end of the sixth resistor R6, the other end of the sixth resistor R6 is connected to the anode of the third diode D3, the cathode of the third diode D3 is connected between the switch of the relay RL1 and the connection line of the first wire connecting part CN1, one end of the second wire connecting part is connected to the neutral line, and the other end is connected between the connection line between the fifth resistor R5 and the anode of the photocoupler IC1.

2. The socket circuit according to claim 1, characterized in that: The second wire connecting portion includes a second connecting unit CN2, which is provided with a first connecting end, a second connecting end and a third connecting end. The first connecting end and the second connecting end are arranged in parallel and connected to the neutral line. The third connecting end is connected between the connecting line between the fifth resistor R5 and the anode of the photocoupler IC1.

3. The socket circuit according to claim 1, characterized in that: The second wire connecting portion includes a second connecting unit CN2 and a third connecting unit CN3, the second connecting unit CN2 is connected to the neutral line, one end of the third connecting unit CN3 is connected to the ground line, and the other end of the third connecting unit CN3 is connected between the connecting line between the fifth resistor R5 and the anode of the photocoupler IC1.

4. The socket circuit according to claim 3, characterized in that: The second connection unit CN2 is provided with a first connection end and a second connection end, the first connection end and the second connection end are provided in parallel and connected to the neutral line.

5. The socket circuit according to claim 3, characterized in that: The third connection unit CN3 is provided with a first connection end, a second connection end and a third connection end, the first connection end and the second connection end are provided in parallel and connected to the ground line, and the third connection end is connected between the connection line between the fifth resistor R5 and the anode of the photocoupler IC1.

6. The socket circuit according to claim 1, characterized in that: A seventh resistor R7 is connected in series between the sixth resistor R6 and the third diode D3.

7. The socket circuit according to claim 1, characterized in that: The second switch tube Q2 and the fourth switch tube Q4 are NMOS tubes or N-type triodes.

8. The socket circuit according to claim 1, characterized in that: The third switch tube Q3 is a PMOS tube or a P-type transistor.

9. The socket circuit according to claim 1, characterized in that: The auxiliary power supply module outputs a first power supply VCC1, a second power supply VCC2 and a third power supply VCC3 respectively.

10. A socket, characterized in that: Comprising the socket circuit according to any one of claims 1 to 9.

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