CN217486152U - An AC transmission circuit and socket - Google Patents

Abstract

The utility model relates to the technical field of electrical appliances, in particular to an AC power transmission protection circuit and a socket. It includes a power supply circuit and a protection circuit coupled to the power supply circuit; the protection circuit includes a main control circuit, a surge detection circuit and a switch device connected in series with the power supply circuit, the main control circuit is signally connected to the switch device and controls the power supply through the switch device When the circuit is turned on and off, the input end of the surge detection circuit is connected with the power supply circuit to detect the current of the power supply circuit, and the output end of the surge detection circuit is connected with the main control circuit. The socket includes a socket body and a circuit structure arranged in the socket body, and the circuit structure is the AC power transmission circuit provided by the utility model. The AC power transmission circuit and socket provided by the utility model solve the technical problem that the existing AC power transmission circuit is not safe enough, thereby improving the safety of the AC power transmission circuit.

Description

An AC transmission circuit and socket

【Technical field】

The utility model relates to the technical field of electrical appliances, in particular to an AC power transmission circuit and a socket.

【Background technique】

AC transmission circuits are widely used in people's daily life. In order to facilitate control, AC transmission circuits with switches have appeared.

However, the existing AC power transmission circuits with switches only have the functions of manually turning on and off. When the input voltage is abnormal, there is no corresponding protection measure, and there is a potential safety hazard.

【Content of utility model】

In order to solve the technical problem that the existing AC power transmission circuit is not safe enough, the utility model provides an AC power transmission circuit and a socket.

The solution to the technical problem of the present invention is to provide an AC power transmission circuit, the AC power transmission circuit includes a power supply circuit and a protection circuit coupled to the power supply circuit;

The protection circuit includes a main control circuit, a surge detection circuit and a switch device serially connected to the power supply circuit. The main control circuit is signally connected to the switch device and controls the power supply circuit through the switch device. on and off;

The input end of the surge detection circuit is connected to the power supply circuit, and the output end of the surge detection circuit is connected to the main control circuit; the surge detection circuit includes a transformer, and the main control circuit is connected to the main control circuit through the transformer. The power supply circuit is electrically isolated.

Preferably, the surge detection circuit includes a varistor, and the varistor is connected to the power supply circuit.

Preferably, the primary coil of the transformer is connected to the power supply circuit through a varistor, and the secondary coil of the transformer is connected to the main control circuit.

Preferably, the switch device is a combination of one or more of a triac, a relay and a MOS transistor.

Preferably, the protection circuit further includes an AC voltage detection circuit, the AC voltage detection circuit is connected with the power supply circuit to detect the voltage of the power supply circuit, and the output end of the AC voltage detection circuit is connected to the main control circuit connect.

Preferably, when the input voltage of the power supply circuit is within a preset voltage threshold range, the main control circuit controls the switching device to be connected.

Preferably, the preset voltage threshold is 90V˜250V.

Preferably, the protection circuit further includes a temperature detection circuit to detect the temperature of the AC power transmission circuit, and the temperature detection circuit is connected to the main control circuit.

Preferably, the temperature detection circuit detects the temperature of the switching device and feeds back the detected temperature value to the main control circuit, and the main control circuit controls the switching device on and off according to the detected temperature value.

Preferably, the protection circuit further includes a switch isolation control circuit, and the switch device is connected to the main control circuit through the switch isolation control circuit.

Preferably, the switch isolation control circuit includes an optocoupler.

Preferably, the protection circuit further includes an alarm circuit, and the main control circuit is signally connected to the alarm circuit and controls the alarm circuit to alarm.

Another solution of the present invention to solve the technical problem is to provide a socket, which includes a socket body and a circuit structure arranged in the socket body, and the circuit structure is the above-mentioned AC power transmission circuit.

Compared with the prior art, the AC power transmission circuit provided by the utility model has the following advantages:

1. The AC transmission circuit provided by the embodiment of the present utility model includes a power supply circuit and a protection circuit coupled to the power supply circuit, and the protection circuit includes a main control circuit, a surge detection circuit and a switch device connected in series on the power supply circuit , the main control circuit is signally connected with the switching device and controls the on-off of the power supply circuit through the switching device. Through the design of coupling the switch device on the power supply circuit, the problem of easy ignition at the switch in the AC power transmission circuit is effectively avoided, thereby improving the safety and reliability of the AC power transmission circuit. In addition, the design of controlling the on-off of the AC power transmission circuit through the switching device makes the life of the protection circuit in the AC power transmission circuit longer, thereby improving the service life of the protection circuit of the AC power transmission circuit. In addition, the protection circuit further includes the design of a surge detection circuit, which can detect abnormalities such as high-voltage surges and lightning strikes input to the power supply circuit. First, it can prevent damage to the internal components when the external voltage is abnormal, thereby ensuring the AC transmission circuit. The second is that the power supply circuit and the protection circuit can be electrically isolated through the transformer, thereby improving the safety of the AC transmission circuit.

2. In the AC power transmission circuit provided by the embodiment of the present invention, the surge detection circuit includes the design of a varistor and a transformer. When a high voltage is input to the power supply circuit, the varistor is turned on, and the voltage of the primary coil of the transformer changes. The voltage and current of the secondary coil of the transformer are reduced before the switching device breaks down, and the power supply circuit and the protection circuit can be electrically isolated through this design.

3. In the AC transmission circuit provided by the embodiment of the present utility model, the switching device is a triac, a relay and/or a MOS tube, and the switching device is a non-physical switching semiconductor switch design, and it is not easy to cause the physical switching switch to ignite. problem, higher security. When the switch device is a bidirectional thyristor, the problem of easy ignition at the switch in the AC power transmission circuit is effectively avoided, thereby improving the safety and reliability of the AC power transmission circuit. In addition, the design of controlling the on-off of the AC power transmission circuit by the triac makes the life of the protection circuit in the AC power transmission circuit longer, thereby improving the service life of the protection circuit of the AC power transmission circuit.

4. In the AC power transmission circuit provided by the embodiment of the present invention, the protection circuit further includes an AC voltage detection circuit, and the AC voltage detection circuit can detect the voltage value input by the power supply circuit. In addition, when the AC voltage detection circuit detects that the voltage input by the power supply circuit is within the preset voltage threshold range, the main control circuit controls the switching device to be connected, thereby ensuring the normal power supply of the power supply circuit. When the main control circuit determines that the AC voltage detection circuit detects that the voltage input by the power supply circuit is outside the preset voltage threshold range, that is, the voltage input by the power supply circuit is abnormal. At this time, the main control circuit controls the switching device to turn off, and then controls the power supply circuit. Power off. Through the design of the main control circuit and the AC voltage detection circuit, the safety and reliability of the AC transmission circuit are further guaranteed.

5. In the AC power transmission circuit provided by the embodiment of the present invention, the protection circuit includes a temperature detection circuit, which detects the temperature of the AC power transmission circuit, and can feed back to the main control circuit according to the detected temperature to control the power supply circuit on and off. In addition, a threshold value at which the temperature detection circuit detects overtemperature of the switching device may be set in advance. When the main control circuit determines that the temperature detection circuit detects that the temperature of the switching device is too high, that is, when the AC output circuit is abnormal, the main control circuit controls the switching device to turn off, and then controls the power supply circuit to stop supplying power. Through the design of the main control circuit and the temperature detection circuit, the safety and reliability of the AC transmission circuit are further guaranteed.

6. In the AC power transmission circuit provided by the embodiment of the present utility model, the protection circuit includes a switch isolation control circuit, and the main control circuit controls the switching device through the switch isolation control circuit, which can electrically isolate the power supply circuit and the main control circuit, thereby preventing the power supply circuit. The main control circuit is damaged by the surge voltage, etc., thereby prolonging the life of the AC transmission circuit. In addition, the design of electrically isolating the power supply circuit from the main control circuit can prevent the high-voltage alternating current from being directly connected to the main control circuit, thereby further improving the safety of the user artificially controlling the on-off of the alternating current transmission circuit. In addition, the switch isolation control circuit includes the design of the optocoupler, which further ensures that the main control circuit can perform reliable isolation control on the switch device, making the main control circuit more secure and reliable.

7. In the AC transmission circuit provided by the embodiment of the present utility model, the protection circuit further includes an alarm circuit. By designing the alarm circuit, when the surge detection circuit detects abnormality such as high-voltage surges and lightning strikes input by the power supply circuit, the AC voltage detection circuit detects When the input voltage of the power supply circuit is not within the voltage threshold range and/or when the temperature detection circuit detects that the temperature of the switching device is abnormal, the alarm circuit will issue an alarm, so that people can find out the abnormality of the AC transmission circuit in time.

8. A socket provided by the embodiment of the present invention has the same beneficial effects as the above-mentioned AC power transmission circuit, which is not repeated here.

【Description of drawings】

1 is a schematic diagram 1 of a circuit structure module of an AC power transmission circuit according to the first embodiment of the present invention;

2 is a schematic diagram 2 of a circuit structure module of the AC power transmission circuit according to the first embodiment of the present invention;

3 is a schematic diagram of the circuit principle of the power supply circuit of the AC power transmission circuit according to the first embodiment of the present invention;

4 is a schematic diagram of the circuit principle of the main control circuit of the AC power transmission circuit according to the first embodiment of the present invention;

5 is a schematic diagram of the circuit principle of the AC voltage detection circuit of the AC power transmission circuit according to the first embodiment of the present invention;

6 is a schematic diagram of the circuit principle of the surge detection circuit of the AC power transmission circuit according to the first embodiment of the present invention;

7 is a schematic diagram of the circuit principle of the switch isolation control circuit of the AC power transmission circuit according to the first embodiment of the present invention;

8 is a schematic structural diagram of a socket according to a second embodiment of the present invention.

Description of drawings:

1. AC transmission circuit; 3. Socket;

11, power supply circuit; 21, protection circuit; 22, switch device; 23, main control circuit; 24, surge detection circuit; 25, AC voltage detection circuit; 26, alarm circuit; 27, temperature detection circuit; 28, switch isolation Control circuit; 29. Voltage regulator circuit;

31, the socket body; 32, the circuit structure.

【Detailed ways】

In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and implementation examples. It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not intended to limit the present invention.

Referring to FIG. 1 and FIG. 2 , a first embodiment of the present invention provides an AC power transmission circuit 1 . The AC transmission circuit 1 includes a power supply circuit 11 and a protection circuit 21 coupled to the power supply circuit 11; the protection circuit 21 includes a main control circuit 23, a surge detection circuit 24, and a switch device 22 connected in series to the power supply circuit 11. The circuit 23 is signally connected to the switching device 22 and controls the on-off of the power supply circuit 11 through the switching device 22 ;

Understandably, the protection circuit 21 of the first embodiment of the present invention includes a main control circuit 23 and a switch device 22 connected to the power supply circuit 11 in series. The main control circuit 23 is signally connected to the switch device 22 and controls the power supply through the switch device 22 . circuit 11 on and off. Through the design of coupling the switch device 22 on the power supply circuit 11 , the problem of easy ignition at the switch in the AC transmission circuit 1 is effectively avoided, thereby improving the safety and reliability of the AC transmission circuit 1 .

Further, the switch device 22 controls the on-off design of the AC power transmission circuit 1 , so that the protection circuit 21 in the AC power transmission circuit 1 has a longer service life, thereby improving the service life of the protection circuit 21 of the AC power transmission circuit 1 .

Further, the protection circuit 21 of the first embodiment of the present invention further includes a voltage-stabilizing circuit 29, the voltage-stabilizing circuit 29 is connected to the main control circuit 23, and the voltage-stabilizing circuit 29 supplies power to the main control circuit 23.

It can be understood that the voltage regulator circuit 29 in the first embodiment of the present invention may be an input circuit connected to the primary input terminal. Wherein, the input circuit is the input circuit of a conventional primary-side feedback system, which includes AC input, primary rectification, and primary filtering connected in sequence. Then, the primary input power is provided to the transformer, the load to be charged is connected to the secondary output terminal, and the secondary output terminal supplies the charging power to the charging load.

It should be noted that a part of the power supply circuit 11 of the first embodiment of the present invention is transmitted to the voltage regulator circuit 29, and the other part is output to supply power to the socket. The voltage regulator circuit 29 is the main control circuit 23, the surge detection circuit 24, and the AC voltage The detection circuit 25 , the alarm circuit 26 , the temperature detection circuit 27 and the switch isolation control circuit 28 are powered.

2 and 3, the power supply circuit 11 of the first embodiment of the present invention includes an AC input terminal and an AC output terminal. It can be understood that the AC input terminal is used for inputting alternating current, and the AC output terminal is used for outputting alternating current. socket power supply.

The protection circuit 21 of the first embodiment of the present invention includes a surge detection circuit 24, a resistor R1, a capacitor C2, a switching device 22 and a main control circuit 23. The resistor R1 and the capacitor C2 are connected in series to form a resistance-capacitance absorption resistor, which can protect the switch The device 22 is not broken down, the surge detection circuit 24 is connected to the power supply circuit 11 , the switch device 22 is coupled to the power supply circuit 11 , and both the switch device 22 and the surge detection circuit 24 are connected to the main control circuit 23 .

Understandably, when the AC power is input, the main control circuit 23 controls the on-off of the switching device 22 , and then controls the on-off of the power supply circuit 11 .

It should be noted that the switch device 22 in this embodiment may be a triac, a relay and/or a MOS transistor. The switch device 22 is a non-physical switching semiconductor switch design, which is less prone to the problem of ignition of the physical switching switch and higher safety. When the switch device 22 is a triac, the problem of easy ignition at the switch in the AC power transmission circuit 1 is effectively avoided, thereby improving the safety and reliability of the AC power transmission circuit 1 . In addition, the design of controlling the on-off of the AC power transmission circuit 1 by the triac makes the life of the protection circuit 21 in the AC power transmission circuit 1 longer, thereby improving the service life of the protection circuit 21 of the AC power transmission circuit 1 .

Understandably, the protection circuit 21 further includes the design of the surge detection circuit 24, which can detect abnormalities such as high-voltage surges and lightning strikes input by the power supply circuit 11, and can prevent internal components from being damaged when the external voltage is abnormal, thereby ensuring AC The normal operation of the power transmission circuit 1.

Understandably, the main control circuit 23 in this embodiment may be a single chip microcomputer, a microcontroller, a field programmable gate array, a general-purpose array logic logic, or any combination thereof.

Specifically, please refer to FIG. 4 , the main control circuit 23 of the first embodiment of the present invention is a chip with a model of QFN20, which is an 8-bit microcontroller (MCU) based on a low-power platform, making it Ideal for any battery-operated application. It also features 8kB Flash, 0.5kBRAM, 16 digital I/O pins, 4x16-bit timers, 3 PCA channels and other peripheral communication devices.

Among them, the main control chip U4 is used to control the switching device 22 on and off, and the main control chip U4 is also used to receive the information collected by the surge detection circuit 24 and the AC voltage detection circuit 25 . The main control chip U4 is also used to receive the temperature information collected by the temperature detection circuit 27 .

Further, referring to FIG. 3 and FIG. 6 , the surge detection circuit 24 of the first embodiment of the present invention at least includes a varistor MOV1 and a transformer T1, the varistor MOV1 is connected to the power supply circuit 11, and the primary coil of the transformer T1 passes through The varistor MOV1 is connected to the power supply circuit 11 , and the secondary coil of the transformer T1 is connected to the main control circuit 23 . Through this design, the power supply circuit 11 and the protection circuit 21 can be electrically isolated through the transformer T1, thereby improving the safety of the AC power transmission circuit 1

Specifically, the surge detection circuit 24 of this embodiment includes a varistor MOV1, a transformer T1, an AC-AC converter D4, a resistor R16, a resistor R17, a resistor R18, a resistor R19 and a transistor Q3. One end of the varistor MOV1 is connected to the power supply circuit 11, the other end of the varistor MOV1 is connected to the primary coil of the transformer T1, the secondary coil of the transformer T1 is connected to one end of the AC-AC converter D4, and the AC-AC converter D4 The other end of the resistor R18 is connected to one end of the resistor R18, one end of the resistor R18 is connected to one end of the resistor R17, the other end of the resistor R18 is grounded, the other end of the resistor R17 is connected to one end of the resistor R19, the other end of the resistor R19 is grounded, and the emitter of the transistor Q3 is grounded. The base of the transistor Q3 is connected to the resistor R17 and the resistor R19, and the collector of the transistor Q3 is connected to the PA4 pin of the main control circuit 23.

Understandably, when the voltage input by the power supply circuit 11 is a low voltage, the varistor MOV1 is in an off state, and at this time, the switch device 22 is in a connected state. When the input voltage of the power supply circuit 11 is a high voltage, the varistor MOV1 is turned on, and the input voltage and current become larger at this time. Before the switching device 22 breaks down, under the action of the transformer T1, the transformer T1 The current of the secondary coil decreases, and the triode Q3 is in a conducting state at this time, and the main control circuit 23 controls the switching device 22 to turn off, thereby electrically isolating the power supply circuit 11 and the protection circuit 21 . Through this design, the safety of the AC power transmission circuit 1 is improved. It should be understood that the low voltage is relative to the high voltage. Here, the low voltage refers to a voltage less than the turn-on threshold of the varistor MOV1 , and the high voltage refers to a voltage greater than or equal to the turn-on threshold of the varistor MOV1 . Optionally, in the embodiment of the present invention, the turn-on threshold of the varistor MOV1 is 1000V, and when the input voltage is greater than 1000V, the varistor MOV1 turns on.

Further, referring to FIG. 3 and FIG. 5 , the protection circuit 21 of the first embodiment of the present invention further includes an AC voltage detection circuit 25 , wherein the AC voltage detection circuit 25 is connected to the power supply circuit 11 to detect the power supply circuit 11 The output terminal of the AC voltage detection circuit 25 is connected to the main control circuit 23 .

Specifically, the AC voltage detection circuit 25 includes a resistor R27, a resistor R28, a transformer T2, a diode ZD3 and a capacitor C10. The primary coil of the transformer T2 is connected to the input end of the power supply circuit 11, the resistor R27 and the resistor R28 are connected in series to the primary coil of the transformer T2, the secondary coil of the transformer T2 is connected to the diode ZD3, and the anode of the diode ZD3 is connected to the capacitor C10.

It can be understood that the AC voltage detection circuit 25 is used to detect the voltage value input by the power supply circuit 11. When the AC voltage detection circuit 25 detects that the voltage value input by the power supply circuit 11 is normal, the main control circuit 23 controls the switching device 22 to connect, and then Ensure the normal power supply of the power supply circuit 11 . When the AC voltage detection circuit 25 detects that the voltage value input by the power supply circuit 11 is abnormal, the main control circuit 23 controls the switching device 22 to turn off, thereby causing the power supply circuit 11 to stop supplying power. Through this design, the safety and reliability of the AC power transmission circuit 1 are further ensured.

Further, the main control circuit 23 stores a preset voltage threshold, and when the input voltage of the power supply circuit 11 is within the preset voltage threshold range, the main control circuit 23 controls the switching device 22 to connect. Wherein, the preset voltage threshold in this embodiment is 90V˜250V.

It should be noted that when the power adapter is the US standard, the voltage threshold is 100V to 120V.

It should be noted that when the power adapter is British, Chinese or European, the voltage threshold is 200V to 240V.

It can be understood that when the voltage value of the AC input is within the voltage threshold range, the switching device 22 is in the ON state. When the AC input voltage value is not outside the voltage threshold range, the main control circuit 23 controls the switch device 22 to turn off, and the switch device 22 is in the off state, and the power supply circuit 11 stops supplying power. The AC voltage detection circuit 25 detects whether the AC input voltage is in the normal working range, and then the main control circuit 23 controls whether the switching device 22 is turned off. Through this design, it is possible to prevent the user from artificially controlling the on-off of the AC power transmission circuit 1 , thereby further improving the safety of the AC power transmission circuit 1 .

Further, referring to FIG. 2 and FIG. 7 , the protection circuit 21 of the first embodiment of the present invention further includes a switch isolation control circuit 28 , and the switch device 22 is connected to the main control circuit 23 through the switch isolation control circuit 28 . The switch isolation control circuit 28 in this embodiment includes an optocoupler.

Understandably, by setting the switch isolation control circuit 28, the main control circuit 23 controls the switching device 22 through the switch isolation control circuit 28, so that the power supply circuit 11 and the main control circuit 23 can be electrically isolated, thereby avoiding surges in the power supply circuit 11. The main control circuit 23 is damaged by voltage or the like, thereby prolonging the life of the AC power transmission circuit 1 . In addition, the design of electrically isolating the power supply circuit 11 and the main control circuit 23 can prevent the high-voltage alternating current from being directly connected to the main control circuit 23, thereby further improving the safety of the user artificially controlling the on-off of the alternating current transmission circuit 1.

Further, when the switching device 22 is connected to a high voltage, the power supply circuit 11 and the main control circuit 23 need to be isolated and controlled. The optocoupler in this embodiment has a good isolation effect. The power supply circuit 11 and the main control circuit 23 are directly isolated from weak electricity and strong electricity. When the switch device 22 is connected to high voltage, the connection time of the switch device 22 is controlled by the optocoupler, thereby isolating the high voltage of the switch device 22, thereby making the main control circuit 23 is more secure and reliable.

Specifically, the switch isolation control circuit 28 includes an optocoupler U1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7 and a transistor Q2.

Among them, the optocoupler U1 has 6 pins, the anode of the light emitter of the optocoupler U1 (ie the 1 pin of the optocoupler U1) is connected to a 5V voltage through the resistor R4, and the collector of the transistor Q2 is connected to the optocoupler U1. The cathode of the light emitter (ie, the 2 pin of the optocoupler U1) is coupled, the emission set of the transistor Q2 is grounded, and the base of the transistor Q2 is coupled to the PA7 pin of the main control chip U4 through the resistor R7, and the resistor R7 is also connected in series There is a resistor R6, and the other end of the resistor R6 is grounded.

One end of the light receiver of the optocoupler U1 (that is, the 6-pin of the optocoupler U1) is coupled to the AC power transmission through the resistor R3 and the resistor R4, and the other end of the light receiver of the optocoupler U1 (that is, the 4 pins) are connected to the triac Q1 and the resistor R5, the resistor R5 and the triac Q1 are connected in series, and the 5 pins and the 3 pins of the optocoupler U1 are both floating.

It can be understood that the working process of the switch isolation control circuit 28 is as follows: the optocoupler U1 adopts an optocoupler with a model of MOC3041, and its interior contains a zero-crossing detection circuit. When the corresponding current is input to the input pin of the optocoupler U1, the voltage value between the 6th pin and the 4th pin of the optocoupler U1 slightly crosses zero. At this time, the triac inside the optocoupler U1 is turned on. When the main control chip U4 collects the AC voltage zero-crossing electrical signal, it triggers the main control chip U4 to generate an event interrupt, which is driven by the trigger switch device 22 to control the switch device 22 to connect. When a current of 0 mA is input to the input pin of the optocoupler U1, the triac inside the optocoupler U1 is turned off at this time. After the main control chip U4 receives the signal, the main control chip U4 disconnects the signal to the switching device 22, thereby The control switch device 22 is turned off, and then the power supply circuit 11 stops supplying power.

Further, the protection circuit 21 of the first embodiment of the present invention further includes a temperature detection circuit 27 to detect the temperature of the AC power transmission circuit 1, and the temperature detection circuit 27 is connected to the main control circuit 23.

Understandably, the temperature detection circuit 27 includes at least a thermistor.

Understandably, the temperature detection circuit 27 of the first embodiment of the present invention detects the temperature of the AC transmission circuit 1 and feeds back the detected temperature value to the main control circuit 23 , so that the main control circuit 23 controls the power supply circuit 11 on and off.

Further, the temperature detection circuit 27 detects the temperature of the switching device 22 and feeds back the detected temperature value to the main control circuit 23, and the main control circuit 23 controls the switching device 22 on and off according to the detected temperature value.

Understandably, the temperature detection circuit 27 of the first embodiment of the present invention is used to detect the temperature of the switching device 22 and send the detected temperature value of the switching device 22 to the main control circuit 23 .

In a specific application, the temperature detection circuit 27 is used to detect the over-temperature threshold of the switching device 22 in advance. When the main control circuit 23 determines that the temperature detection circuit 27 detects that the temperature of the switching device 22 exceeds the over-temperature threshold, it means that the switching device is at this time. When the temperature of 22 is too high, the AC transmission circuit 1 is abnormal, and then the main control circuit 23 sends an OFF signal to the switching device 22. At this time, the switching device 22 is turned off, and then the power supply circuit 11 is controlled to stop supplying power.

Optionally, the preset over-temperature threshold in the first embodiment of the present invention is between 70°C and 110°C. Preferably, the preset over-temperature threshold is 80°C to 100°C.

Specifically, the preset over-temperature threshold may be, but not limited to, 70°C, 75°C, 80°C, 85°C, 95°C, 100°C, 105°C, or 110°C.

Further, the protection circuit 21 of the first embodiment of the present invention also includes an alarm circuit 26, and the main control circuit 23 is signally connected to the alarm circuit 26 and controls the alarm circuit 26 to alarm.

Understandably, when the surge detection circuit 24 detects abnormal conditions such as high-voltage surges and lightning strikes input by the power supply circuit 11, when the AC voltage detection circuit 25 detects that the voltage value of the AC input exceeds the voltage threshold, or the temperature detection circuit When 27 detects that the temperature value of the AC transmission circuit 1 is abnormal, the alarm circuit 26 gives an alarm instruction.

It should be noted that the alarm circuit 26 of the embodiment of the present invention includes a buzzer, a sound and light alarm, and/or a light alarm, and the like. When the alarm circuit 26 is a buzzer, when the main control circuit outputs a high level, the buzzer will sound.

To sum up, the power supply circuit inputs AC power, and part of the AC power is transmitted to the voltage regulator circuit, which supplies power to the main control circuit. Part of it is transmitted to the socket to supply power to the socket. The main control circuit further controls the on-off of the power supply circuit by controlling the switching device. The surge detection circuit is used to detect abnormalities such as high-voltage surges and lightning strikes input to the power supply circuit, which can prevent internal components from being damaged when the external voltage is abnormal. The AC voltage detection circuit can detect the voltage value input by the power supply circuit. When the AC voltage detection circuit detects that the voltage value input by the power supply circuit is normal, the main control circuit controls the switching device to connect, thereby ensuring the normal power supply of the power supply circuit. When it is detected that the voltage value input by the power supply circuit is abnormal, the main control circuit controls the switching device to turn off, and then controls the power supply circuit to stop supplying power. The temperature detection circuit is used to detect the temperature of the switching device. When the main control circuit determines that the temperature detection circuit detects that the temperature of the switching device is over-temperature, the AC output circuit is abnormal, and the main control circuit controls the switching device to turn off, and then Control the power supply circuit to stop power supply. The switch isolation control circuit is used to electrically isolate the power supply circuit and the main control circuit. When the AC transmission is input with high voltage, it can prevent the high-voltage AC power from being directly connected to the main control circuit, and the switch isolation control circuit also includes an optocoupler, which can further control the switch. The device performs reliable isolation control. When the AC transmission circuit works abnormally, the alarm circuit issues an alarm.

Referring to FIG. 8 , a second embodiment of the present invention provides a socket 3 , which includes a socket body 31 and a circuit structure 32 disposed in the socket body 31 , wherein the circuit structure 32 is the AC in the first embodiment Transmission circuit 1.

It can be understood that the second embodiment of the present invention provides a socket 3, which has the same effect as the AC power transmission circuit 1 in the first embodiment, which is not repeated here.

Compared with the prior art, the AC power transmission circuit provided by the utility model has the following advantages:

1. The AC transmission circuit provided by the embodiment of the present utility model includes a power supply circuit and a protection circuit coupled to the power supply circuit, and the protection circuit includes a main control circuit, a surge detection circuit and a switch device connected in series on the power supply circuit , the main control circuit is signally connected with the switching device and controls the on-off of the power supply circuit through the switching device. Through the design of coupling the switch device on the power supply circuit, the problem of easy ignition at the switch in the AC power transmission circuit is effectively avoided, thereby improving the safety and reliability of the AC power transmission circuit. In addition, the design of controlling the on-off of the AC power transmission circuit through the switching device makes the life of the protection circuit in the AC power transmission circuit longer, thereby improving the service life of the protection circuit of the AC power transmission circuit. In addition, the protection circuit further includes the design of a surge detection circuit, which can detect abnormalities such as high-voltage surges and lightning strikes input to the power supply circuit. First, it can prevent damage to the internal components when the external voltage is abnormal, thereby ensuring the AC transmission circuit. The second is that the power supply circuit and the protection circuit can be electrically isolated through the transformer, thereby improving the safety of the AC transmission circuit.

2. In the AC power transmission circuit provided by the embodiment of the present invention, the surge detection circuit includes the design of a varistor and a transformer. When a high voltage is input to the power supply circuit, the varistor is turned on, and the voltage of the primary coil of the transformer changes. The voltage and current of the secondary coil of the transformer are reduced before the switching device breaks down, and the power supply circuit and the protection circuit can be electrically isolated through this design.

3. In the AC transmission circuit provided by the embodiment of the present utility model, the switching device is a triac, a relay and/or a MOS tube, and the switching device is a non-physical switching semiconductor switch design, and it is not easy to cause the physical switching switch to ignite. problem, higher security. When the switch device is a bidirectional thyristor, the problem of easy ignition at the switch in the AC power transmission circuit is effectively avoided, thereby improving the safety and reliability of the AC power transmission circuit. In addition, the design of controlling the on-off of the AC power transmission circuit by the triac makes the life of the protection circuit in the AC power transmission circuit longer, thereby improving the service life of the protection circuit of the AC power transmission circuit.

4. In the AC power transmission circuit provided by the embodiment of the present invention, the protection circuit further includes an AC voltage detection circuit, and the AC voltage detection circuit can detect the voltage value input by the power supply circuit. In addition, when the AC voltage detection circuit detects that the voltage input by the power supply circuit is within the preset voltage threshold range, the main control circuit controls the switching device to be connected, thereby ensuring the normal power supply of the power supply circuit. When the main control circuit determines that the AC voltage detection circuit detects that the voltage input by the power supply circuit is outside the preset voltage threshold range, that is, the voltage input by the power supply circuit is abnormal. At this time, the main control circuit controls the switching device to turn off, and then controls the power supply circuit. Power off. Through the design of the main control circuit and the AC voltage detection circuit, the safety and reliability of the AC transmission circuit are further guaranteed.

5. In the AC power transmission circuit provided by the embodiment of the present invention, the protection circuit includes a temperature detection circuit, which detects the temperature of the AC power transmission circuit, and can feed back to the main control circuit according to the detected temperature to control the power supply circuit on and off. In addition, a threshold value at which the temperature detection circuit detects overtemperature of the switching device may be set in advance. When the main control circuit determines that the temperature detection circuit detects that the temperature of the switching device is too high, that is, when the AC output circuit is abnormal, the main control circuit controls the switching device to turn off, and then controls the power supply circuit to stop supplying power. Through the design of the main control circuit and the temperature detection circuit, the safety and reliability of the AC transmission circuit are further guaranteed.

6. In the AC power transmission circuit provided by the embodiment of the present utility model, the protection circuit includes a switch isolation control circuit, and the main control circuit controls the switching device through the switch isolation control circuit, which can electrically isolate the power supply circuit and the main control circuit, thereby preventing the power supply circuit. The main control circuit is damaged by the surge voltage, etc., thereby prolonging the life of the AC transmission circuit. In addition, the design of electrically isolating the power supply circuit from the main control circuit can prevent the high-voltage alternating current from being directly connected to the main control circuit, thereby further improving the safety of the user artificially controlling the on-off of the alternating current transmission circuit. In addition, the switch isolation control circuit includes the design of the optocoupler, which further ensures that the main control circuit can perform reliable isolation control on the switch device, making the main control circuit more secure and reliable.

7. In the AC transmission circuit provided by the embodiment of the present utility model, the protection circuit further includes an alarm circuit. By designing the alarm circuit, when the surge detection circuit detects abnormality such as high-voltage surges and lightning strikes input by the power supply circuit, the AC voltage detection circuit detects When the input voltage of the power supply circuit is not within the voltage threshold range and/or when the temperature detection circuit detects that the temperature of the switching device is abnormal, the alarm circuit will issue an alarm, so that people can find out the abnormality of the AC transmission circuit in time.

8. A socket provided by the embodiment of the present invention has the same beneficial effects as the above-mentioned AC power transmission circuit, which is not repeated here.

The above are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the principles of the present utility model shall include the protection of the present utility model. within the range.

Claims (13)

1. An AC power transmission circuit, characterized in that: the AC power transmission circuit comprises a power supply circuit and a protection circuit coupled to the power supply circuit; The protection circuit includes a main control circuit, a surge detection circuit and a switch device serially connected to the power supply circuit. The main control circuit is signally connected to the switch device and controls the power supply circuit through the switch device. on and off; The input end of the surge detection circuit is connected to the power supply circuit, and the output end of the surge detection circuit is connected to the main control circuit; the surge detection circuit includes a transformer, and the main control circuit is connected to the main control circuit through the transformer. The power supply circuit is electrically isolated. 2 . The AC power transmission circuit of claim 1 , wherein the surge detection circuit comprises a varistor, and the varistor is connected to the power supply circuit. 3 . 3 . The AC power transmission circuit according to claim 2 , wherein the primary coil of the transformer is connected to the power supply circuit through a varistor, and the secondary coil of the transformer is connected to the main control circuit. 4 . 4 . The AC power transmission circuit according to claim 1 , wherein the switching device is a combination of one or more of triacs, relays and MOS transistors. 5 . 5 . The AC power transmission circuit according to claim 1 , wherein the protection circuit further comprises an AC voltage detection circuit, the AC voltage detection circuit is connected to the power supply circuit to detect the voltage of the power supply circuit, and the The output end of the AC voltage detection circuit is connected to the main control circuit. 6 . The AC power transmission circuit according to claim 5 , wherein when the input voltage of the power supply circuit is within a preset voltage threshold range, the main control circuit controls the switching device to be connected. 7 . 7 . The AC power transmission circuit of claim 6 , wherein the preset voltage threshold is 90V-250V. 8 . 8 . The AC power transmission circuit of claim 1 , wherein the protection circuit further comprises a temperature detection circuit to detect the temperature of the AC power transmission circuit, and the temperature detection circuit is connected to the main control circuit. 9 . 9 . The AC power transmission circuit according to claim 8 , wherein the temperature detection circuit detects the temperature of the switching device and feeds back the detected temperature value to the main control circuit, the main control circuit according to the The detected temperature value controls the on-off of the switch device. 10 . The AC power transmission circuit according to claim 1 , wherein the protection circuit further comprises a switch isolation control circuit, and the switch device is connected to the main control circuit through the switch isolation control circuit. 11 . 11. The AC power transmission circuit of claim 10, wherein the switch isolation control circuit comprises an optocoupler. 12 . The AC power transmission circuit according to claim 1 , wherein the protection circuit further comprises an alarm circuit, and the main control circuit is signally connected to the alarm circuit and controls the alarm circuit to alarm. 13 . 13. A socket, characterized by comprising a socket body and a circuit structure disposed in the socket body, wherein the circuit structure is the AC power transmission circuit according to any one of claims 1-12.

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