Electric quantity detection circuit and extension socket

Abstract

The utility model discloses an electric quantity detection circuit and an extension socket, a connecting line of the extension socket comprises a first live wire branch, a second live wire branch and a zero line, and the electric quantity detection circuit comprises a metering circuit, a current detection circuit and a voltage detection circuit. In the voltage detection circuit, the input end of a voltage transformer is connected with the first live wire branch and the second live wire branch, the output end of the voltage transformer is connected with the metering circuit, the voltage transformer is used for isolating the voltage of the first live wire branch and the voltage of the second live wire branch, and the voltage detection circuit is used for detecting the voltage of the connecting wire and outputting the voltage to the metering circuit. According to the invention, the current and voltage of the connecting line are detected, and the input power and the electricity consumption quantity of the connecting line are obtained through calculation. The input power is calculated based on the current and the voltage of the connecting line, and the voltage transformer isolates the voltage of each live wire branch, so that the influence on the voltage detection of other branches when any branch in the live wire branches is abnormal is avoided, and the detection accuracy of the electric quantity can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of smart sockets, and in particular to a power detection circuit and a socket strip. Background Art

[0002] A power strip is a multi-socket with wires, that is, a multi-socket with power cords and plugs that can be moved. In order to monitor the power usage of electrical equipment in real time, to achieve power control or to ensure power safety, more and more power strips have power detection functions. However, in the prior art, power strips use relays to control the AC input of multiple sockets. When the power supply condition of one of the lines is abnormal and the relay of the line is disconnected, it will result in the inability to collect valid power consumption data, and the accuracy of power detection is low. Utility Model Content

[0003] In view of the problems existing in the background technology, the purpose of this application is to provide a power detection circuit and a socket strip, which obtains the current of the connecting line by detecting the current of the neutral line, obtains the voltage of the connecting line by detecting the voltage of the live line branch, and then obtains the input power and power consumption by calculation. The input power is calculated based on the current and voltage of the connecting line, which can improve the accuracy of power detection.

[0004] To achieve the above-mentioned purpose, the present application provides a power detection circuit, which is applied to a power strip, wherein the connecting line of the power strip includes a first live wire branch, a second live wire branch and a neutral wire, and the power detection circuit includes: a metering circuit; a current detection circuit, wherein the input end of the current detection circuit is connected to the neutral wire, and the output end of the current detection circuit is connected to the metering circuit, and is used to detect the current of the connecting line to output the current to the metering circuit; a voltage detection circuit, including a voltage transformer, wherein the first input end of the voltage transformer is connected to the first live wire branch, the second input end of the voltage transformer is connected to the second live wire branch, and the output end of the voltage transformer is connected to the metering circuit, the voltage transformer is used to isolate the voltage of the first live wire branch and the second live wire branch, and the voltage detection circuit is used to detect the voltage of the connecting line and output the voltage to the metering circuit; the metering circuit is used to receive the current and the voltage, and calculate the input power based on the current and the voltage.

[0005] Wherein, the voltage detection circuit includes a voltage transformer, and the voltage transformer includes a first primary winding, a second primary winding and a secondary winding, the first end of the first primary winding and the first end of the second primary winding are connected to the neutral line, the second end of the first primary winding is connected to the first live wire branch, the second end of the second primary winding is connected to the second live wire branch, and the secondary winding is connected to the metering circuit; wherein, the second end of the first primary winding is the first input end, and the second end of the second primary winding is the second input end.

[0006] Among them, the voltage detection circuit also includes a first voltage divider circuit, a second voltage divider circuit and a first filter circuit, one end of the first voltage divider circuit is connected to the first live wire branch, the other end of the first voltage divider circuit is connected to the second end of the first primary winding, one end of the second voltage divider circuit is connected to the second live wire branch, the other end of the second voltage divider circuit is connected to the second end of the second primary winding, the first end of the secondary winding is grounded, and the second end of the secondary winding is connected to the metering circuit through the first filter circuit.

[0007] The metering circuit includes a processing chip, and the processing chip includes a voltage receiving port. The voltage receiving port is connected to the second end of the secondary winding and is used to receive the voltage.

[0008] Among them, the current detection circuit includes a sampling resistor and a second filtering circuit, the sampling resistor is connected in series to the neutral line, the second filtering circuit is connected in parallel to the sampling resistor, and the first output end of the second filtering circuit and the second output end of the second filtering circuit are connected to the processing chip.

[0009] Among them, the processing chip also includes a first current receiving port and a second current receiving port, the first current receiving port is connected to the first output end of the second filtering circuit, the second current receiving port is connected to the second output end of the second filtering circuit, and the first current receiving port and the second current receiving port are used to receive the current.

[0010] The power detection circuit further includes an isolation circuit and a control chip. The isolation circuit connects the processing chip and the control chip and is used to receive the input power output by the processing chip and output the input power to the control chip.

[0011] Among them, the isolation circuit includes a first isolation circuit and a second isolation circuit, the first isolation circuit is connected to the processing chip and the control chip, and is used to receive the input power output by the processing chip and output the input power to the control chip; the second isolation circuit is connected to the processing chip and the control chip, and is used to receive the feedback signal of the control chip and output the feedback signal to the processing chip.

[0012] The processing chip further includes a data receiving port and a data sending port, wherein the data receiving port is connected to the output end of the first isolation circuit, and the data sending port is connected to the input end of the second isolation circuit.

[0013] In order to achieve the above-mentioned purpose, the present application also provides a power strip, including the power detection circuit as described above.

[0014] The power detection circuit of the present application obtains the current of the connecting line by detecting the current of the neutral line, obtains the voltage of the connecting line by detecting the voltage of the live line branch, and further obtains the input power and power consumption by calculation. The input power is calculated based on the current and voltage of the connecting line, and the voltage of each live line branch is isolated by a voltage transformer to avoid affecting the voltage detection of other branches when any branch in the live line is abnormal, thereby improving the accuracy of power detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 It is a schematic diagram of a framework of an embodiment of a power detection circuit of the present application;

[0017] Figure 2 is a circuit diagram of an embodiment of a power detection circuit of the present application;

[0018] Figure 3 It is a structural diagram of an embodiment of a power strip of the present application. DETAILED DESCRIPTION

[0019] The present application is further described in detail below in conjunction with the accompanying drawings and examples. It is particularly noted that the following examples are only used to illustrate the present application, but are not intended to limit the scope of the present application. Similarly, the following examples are only some embodiments of the present application rather than all embodiments, and all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present application.

[0020] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0021] In the description of this application, it is necessary to explain that, unless otherwise clearly specified and limited, the terms "install", "set", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or connected through an intermediate medium. For ordinary technicians in this field, the above-mentioned specific meanings belonging to this application can be connected according to specific circumstances.

[0022] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradicting each other.

[0023] The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the objects associated before and after are in an "or" relationship. In addition, "many" in this article means two or more than two. In addition, the term "at least one" in this article means any combination of at least two of any one or more of a plurality of, for example, including at least one of A, B, and C, can mean including any one or more elements selected from the set consisting of A, B, and C.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0025] In the prior art, power strips usually implement output control of multiple sockets through relays. When the power supply condition of one of the paths is abnormal and causes the relay of that path to be disconnected, it will result in the inability to collect valid power consumption data and the accuracy of power detection is low.

[0026] See also Figure 1 As shown, Figure 1 It is a schematic diagram of the framework of an embodiment of the power detection circuit of the present application. The power detection circuit 10 of the present application is applied to a power strip, wherein the power strip includes multiple sockets, and multiple electrical devices can be connected to the mains through the multiple sockets. In this embodiment, the power strip including two sockets is used for explanation. The connecting wires of the power strip include a live wire L and a neutral wire N, and the live wire L includes a first live wire branch L1 and a second live wire branch L2. The on and off of the first live wire branch L1 and the second live wire branch L2 are controlled by a relay to control the power supply of the corresponding sockets. For example, the first live wire branch L1 and the neutral wire N of the power strip can be connected to the first electrical device through the first socket to supply power to the first electrical device; the second live wire branch L2 and the neutral wire N of the power strip can be connected to the second electrical device through the second socket to supply power to the second electrical device.

[0027] like Figure 1 As shown, the electric quantity detection circuit 10 of this embodiment includes a metering circuit 11 , a current detection circuit 12 and a voltage detection circuit 13 .

[0028] An input end of the current detection circuit 12 is connected to the neutral line N, and an output end of the current detection circuit 12 is connected to the metering circuit 11 for detecting the current of the connection line to output the current to the metering circuit 11 .

[0029] In this embodiment, the current of the neutral line N and the voltage of the live line L are detected, and then the input power of the power strip during power supply is obtained through the metering circuit 11 .

[0030] The voltage detection circuit 13 includes a voltage transformer 100, a first input end of the voltage transformer 100 is connected to the first live wire branch L1, a second input end of the voltage transformer 100 is connected to the second live wire branch L2, an output end of the voltage transformer 100 is connected to the metering circuit 11, and the voltage detection circuit 13 is used to detect the voltage of the connecting line and output the voltage to the metering circuit 11. The voltage transformer 100 is used to isolate the voltage of the first live wire branch L1 and the second live wire branch L2, to avoid the situation that one of the first live wire branch L1 and the second live wire branch L2 is short-circuited, which affects the voltage detection circuit 13 to detect the voltage of the other live wire branch, and affects the voltage detection circuit 13 to detect the voltage of the connecting line, thereby improving the detection efficiency of the voltage detection circuit 13 to the connecting line voltage.

[0031] The metering circuit 11 is used to receive current and voltage, and calculate input power based on the current and voltage. Optionally, the power detection circuit 10 also includes a control chip, which is connected to the metering circuit 11 to receive the input power obtained by the metering circuit 11, and the control chip converts the input power into power consumption to obtain the power consumption of the power-consuming device. Furthermore, the control chip can also be connected to a display screen to display the input power, the power consumption of the power-consuming device, etc. on the display screen.

[0032] The power detection circuit 10 of this embodiment obtains the current of the connecting line by detecting the current of the neutral line N, obtains the voltage of the connecting line by detecting the voltage of the live line branch, and then obtains the input power and the power consumption by calculation. The input power is calculated based on the current and voltage of the connecting line, which can improve the detection accuracy of the power. At the same time, the voltage transformer 100 isolates the first live line branch L1 and the second live line branch L2 to avoid the short circuit of one of the first live line branch L1 and the second live line branch L2, thereby preventing the voltage detection circuit 13 from detecting the voltage of the other live line branch and affecting the voltage detection circuit 13 from detecting the voltage of the connecting line, thereby improving the detection efficiency of the voltage detection circuit 13 for the voltage of the connecting line.

[0033] See also Figure 2 As shown, Figure 2 Detailed description of the invention is given in detail.

[0034] The metering circuit 11 includes a processing chip 107, which includes a voltage receiving port V3P, a first current receiving port V1P, a second current receiving port V1N, a data receiving port RX, a data transmitting port TX, a reference voltage port VREF, a ground port GND, and a power supply port VDD. The processing chip 107 communicates measurement data between the metering circuit 11 and the control chip through the data receiving port RX and the data transmitting port TX.

[0035] The voltage transformer 100 includes a first primary winding 101, a second primary winding 102 and a secondary winding 103. The first end of the first primary winding 101 and the first end of the second primary winding 102 are connected to the neutral line N, the second end of the first primary winding 101 is connected to the first live wire branch L1, the second end of the second primary winding 102 is connected to the second live wire branch L2, the first end of the secondary winding 103 is grounded, and the second end of the secondary winding 103 is connected to the metering circuit 11.

[0036] The second end of the first primary winding 101 is also the first input end of the voltage transformer 100 mentioned above, and the second end of the second primary winding 102 is also the second input end of the voltage transformer 100 mentioned above.

[0037] The primary winding of the voltage transformer 100 includes a first primary winding 101 and a second primary winding 102. It is understandable that in other embodiments, if the connection line of the power strip includes multiple live branches, the voltage transformer 100 includes multiple primary windings, and the multiple primary windings correspond to the multiple live branches one by one.

[0038] The voltage change of the first live wire branch L1 affects the magnetic flux of the core of the voltage transformer 100 through the first primary winding 101, thereby affecting the output voltage of the secondary winding 103. The voltage change of the second live wire branch L2 affects the magnetic flux of the core of the voltage transformer 100 through the second primary winding 102, thereby affecting the output voltage of the secondary winding 103.

[0039] The first primary winding 101 and the second primary winding 102 of the voltage transformer 100 can isolate the voltage of the first live wire branch L1 and the second live wire branch L2 to prevent the first live wire branch L1 and the second live wire branch L2 from being short-circuited.

[0040] When one of the power supply lines is abnormal and causes the power supply line to be interrupted, the live line voltage can still be effectively detected, and the voltage transformer 100 can capture the voltage change of the live line L more accurately, thereby improving the detection accuracy of the live line voltage by the voltage detection circuit 13 and improving the detection accuracy of the power. In addition, when the power strip includes multiple sockets, by increasing the number of primary windings of the voltage transformer 100 and keeping the secondary winding unchanged, the power consumption of multiple sockets can be detected, thereby improving the detection accuracy of the power.

[0041] The voltage detection circuit 13 also includes a first voltage divider circuit 104, a second voltage divider circuit 105 and a first filter circuit 106. One end of the first voltage divider circuit 104 is connected to the first live wire branch L1, and the other end of the first voltage divider circuit 104 is connected to the second end of the first primary winding 101. One end of the second voltage divider circuit 105 is connected to the second live wire branch L2, and the other end of the second voltage divider circuit 105 is connected to the second end of the second primary winding 102. The second end of the secondary winding 103 is connected to the metering circuit 11 through the first filter circuit 106.

[0042] The first voltage divider circuit 104 includes a plurality of resistors connected in series, and is used to divide the voltage of the first live wire branch L1 and then sample it. The second voltage divider circuit 105 includes a plurality of resistors connected in series, and is used to divide the voltage of the second live wire branch L2 and then sample it.

[0043] The first filter circuit 106 includes a voltage divider resistor 1061 and a filter capacitor 1062. The first end of the voltage divider resistor 1061 is connected to the second end of the secondary winding 103, the second end of the voltage divider resistor 1061 is grounded, and the filter capacitor 1062 is connected to both ends of the voltage divider resistor 1061 in parallel.

[0044] The current detection circuit 12 includes a sampling resistor 108 and a second filter circuit 109 . The sampling resistor 108 is connected in series to the neutral line N. The second filter circuit 109 is connected in parallel to the sampling resistor 108 . The first output end of the second filter circuit 109 and the second output end of the second filter circuit 109 are connected to the metering circuit 11 .

[0045] The sampling resistor 108 may be a manganese copper resistor, and the resistance of the sampling resistor 108 is relatively small, which can improve the detection accuracy of the neutral current. For example, the resistance of the sampling resistor 108 may be 1 milliohm, 10 milliohm or 100 milliohm.

[0046] The second filter circuit 109 includes a first resistor 1091, a second resistor 1092, a first capacitor 1093, and a second capacitor 1094. The first end of the first resistor 1091 is connected to the first end of the sampling resistor, the second end of the first resistor 1091 is grounded through the first capacitor 1093, the first end of the second resistor 1092 is connected to the second end of the sampling resistor 108, the second end of the second resistor 1092 is grounded through the second capacitor 1094, the second end of the first resistor 1091 serves as the first output end of the second filter circuit 109, and the second end of the second resistor 1092 serves as the second output end of the second filter circuit 109.

[0047] The second filter circuit 109 is used to eliminate interference signals, which can improve the reliability, accuracy and safety of collected voltage data.

[0048] Specifically, the voltage receiving port V3P of the processing chip 107 is connected to the second end of the secondary winding 103 for receiving voltage. The first current receiving port V1P is connected to the first output end of the second filter circuit 109, and the second current receiving port V1N is connected to the second output end of the second filter circuit 109. The first current receiving port V1P and the second current receiving port V1N are used to receive current.

[0049] Optionally, the power detection circuit 10 further includes an isolation circuit 14 and a control chip (not shown), wherein the isolation circuit 14 connects the processing chip 107 and the control chip, and is used to receive input power output by the processing chip 107 and output the input power to the control chip.

[0050] Among them, as mentioned above, after the processing chip 107 receives the voltage transmitted by the voltage detection circuit 13 and the current transmitted by the current detection circuit 12, the input power can be calculated based on the voltage and current. Then, the processing chip 107 can transmit the input power to the control chip through the isolation circuit 14. The control chip can perform data conversion on the input power and convert the input power into the power consumption of the electrical equipment.

[0051] like Figure 2 As shown, the isolation circuit 14 includes a first isolation circuit 110 and a second isolation circuit 111. The first isolation circuit 110 is connected to the processing chip 107 and the control chip, and is used to receive the input power output by the processing chip 107 and output the input power to the control chip; the second isolation circuit 111 is connected to the processing chip 107 and the control chip, and is used to receive the feedback signal of the control chip and output the feedback signal to the metering circuit 11.

[0052] Specifically, the first isolation circuit 110 transmits the input power output by the processing chip 107 to the control chip. After the control chip receives the input power transmitted by the first isolation circuit 110, it sends a feedback signal to the second isolation circuit 111, indicating that the input power has been received. Then, the second isolation circuit 111 transmits the feedback signal to the processing chip 107, and the processing chip 107 immediately responds to the successful transmission of the input power.

[0053] The output end of the first isolation circuit 110 is connected to the data transmission port TX of the processing chip 107, and the input end of the first isolation circuit 110 is connected to the input port METER_RX of the control chip. The input end of the second isolation circuit 111 is connected to the data receiving port RX of the processing chip 107, and the output end of the second isolation circuit 111 is connected to the output port METER_TX of the control chip.

[0054] The first isolation circuit 110 receives and outputs input power through a photocoupler, and the second isolation circuit 111 receives and outputs feedback signals through a photocoupler. The first isolation circuit 110 and the second isolation circuit 111 are used to achieve electrical isolation of the circuit, reduce interference noise, and improve anti-interference capability.

[0055] Optionally, the power detection circuit 10 further includes a third resistor 1071, a third capacitor 1072, a fourth capacitor 1073, a fifth capacitor 1074, and a sixth capacitor 1075. The first end of the third resistor 1071 receives a 5V DC voltage, the second end of the third resistor 1071 is connected to the power port VDD of the processing chip 107, the first end of the third capacitor 1072 is connected to the first end of the third resistor 1071, the second end of the third capacitor 1072 is grounded, the first end of the fourth capacitor 1073 is connected to the second end of the third resistor 1071, and the second end of the fourth capacitor 1073 is grounded. The power detection circuit 10 realizes power supply of the processing chip 107 through the third resistor 1071, the third capacitor 1072, and the fourth capacitor 1073.

[0056] The first end of the fifth capacitor 1074 is connected to the reference voltage port VREF of the processing chip 107, the second end of the fifth capacitor 1074 is grounded, the first end of the sixth capacitor 1075 is connected to the reference voltage port VREF of the processing chip 107, and the second end of the sixth capacitor 1075 is grounded. The ground port GND of the processing chip 107 is grounded. The fifth capacitor 1074 and the sixth capacitor 1075 of the power detection circuit 10 are used to stabilize the reference voltage of the processing chip 107.

[0057] See also Figure 3 As shown, Figure 3 1 is a schematic diagram of the structure of an embodiment of the power strip of the present application. Figure 3 As shown, the power strip 20 includes a power detection circuit 10 .

[0058] In this embodiment, a power strip including two sockets (not shown) is used as an example for explanation. The connection line of the power strip includes a live wire L and a neutral wire N, and the live wire L includes a first live wire branch L1 and a second live wire branch L2. The first live wire branch L1 and the second live wire branch L2 are controlled by a relay to switch on and off, thereby controlling the power supply of the corresponding socket. The power detection circuit 10 of this embodiment can obtain the current and voltage of the connection line by detecting the current of the neutral wire N and the voltage of the first live wire branch L1 and the second live wire branch L2 when the user supplies power to the electrical equipment through the power strip 20, and then obtain the input power and power consumption.

[0059] In one embodiment, the power strip 20 includes multiple sockets, and multiple electrical devices can be connected to the mains through the multiple sockets. The power detection circuit 10 of this embodiment can obtain the current and voltage of the connecting line by detecting the current of the neutral line N and the voltage of multiple live line branches, and then obtain the input power and power consumption.

[0060] In one embodiment, the power strip 20 may further include a communication module (not shown), which is connected to the power detection circuit 10 and is used to receive detection data from the power detection circuit 10, such as voltage, current, input power, and power consumption, and upload the detection data to the Internet of Things platform to store and process the detection data. Users can remotely monitor or query the detection data to achieve power control or ensure power safety.

[0061] In one embodiment, the socket 20 may further include a display screen, which is connected to the control chip. After the control chip receives input power and obtains the power consumption of the electrical device, the display screen is used to display the power consumption.

[0062] In the present application, the power detection circuit 10 of the present embodiment obtains the current of the connecting line by detecting the current of the neutral line N, obtains the voltage of the connecting line by detecting the voltage of the live line branch, and then obtains the input power and the power consumption by calculation. The input power is calculated based on the current and voltage of the connecting line, which can improve the detection accuracy of the power. Among them, the power detection circuit 10 can capture the voltage change of the live line L more accurately through the voltage transformer 100, thereby improving the detection accuracy of the live line voltage and the detection accuracy of the power, and the voltage transformer 100 can isolate the voltages of multiple live line branches to prevent the live line branches from short-circuiting. In addition, in the case where the power strip includes multiple sockets, by increasing the number of primary windings of the voltage transformer 100 and keeping the secondary winding unchanged, the power consumption of multiple sockets can be detected, thereby improving the detection accuracy of the power.

[0063] The above-described implementations do not constitute a limitation on the protection scope of the technical solution. Any modifications, equivalent replacements and improvements made within the spirit and principles of the above-described implementations are included in the protection scope of the technical solution.

Claims

1. A power detection circuit, characterized in that: Applied to a power strip, the connection line of the power strip includes a first live wire branch, a second live wire branch and a neutral wire, and the power detection circuit includes: Metering circuit; a current detection circuit, wherein an input end of the current detection circuit is connected to the neutral line, and an output end of the current detection circuit is connected to the metering circuit, and is used to detect the current of the connecting line so as to output the current to the metering circuit; A voltage detection circuit, comprising a voltage transformer, wherein a first input end of the voltage transformer is connected to a first live wire branch, a second input end of the voltage transformer is connected to a second live wire branch, an output end of the voltage transformer is connected to the metering circuit, the voltage transformer is used to isolate the voltage of the first live wire branch and the second live wire branch, and the voltage detection circuit is used to detect the voltage of the connecting line and output the voltage to the metering circuit; The metering circuit is used for receiving the current and the voltage, and calculating input power based on the current and the voltage.

2. The electric quantity detection circuit according to claim 1, characterized in that: The voltage transformer comprises a first primary winding, a second primary winding and a secondary winding, the first end of the first primary winding and the first end of the second primary winding are connected to the neutral line, the second end of the first primary winding is connected to the first live wire branch, the second end of the second primary winding is connected to the second live wire branch, and the secondary winding is connected to the metering circuit; The second end of the first primary winding is the first input end, and the second end of the second primary winding is the second input end.

3. The electric quantity detection circuit according to claim 2, characterized in that: The voltage detection circuit also includes a first voltage divider circuit, a second voltage divider circuit and a first filter circuit, one end of the first voltage divider circuit is connected to the first live wire branch, the other end of the first voltage divider circuit is connected to the second end of the first primary winding, one end of the second voltage divider circuit is connected to the second live wire branch, the other end of the second voltage divider circuit is connected to the second end of the second primary winding, the first end of the secondary winding is grounded, and the second end of the secondary winding is connected to the metering circuit through the first filter circuit.

4. The electric quantity detection circuit according to claim 3, characterized in that: The metering circuit includes a processing chip, and the processing chip includes a voltage receiving port, and the voltage receiving port is connected to the second end of the secondary winding and is used to receive the voltage.

5. The electric quantity detection circuit according to claim 4, characterized in that: The current detection circuit includes a sampling resistor and a second filter circuit, the sampling resistor is connected in series to the neutral line, the second filter circuit is connected in parallel to the sampling resistor, and a first output end of the second filter circuit and a second output end of the second filter circuit are connected to the processing chip.

6. The electric quantity detection circuit according to claim 5, characterized in that: The processing chip also includes a first current receiving port and a second current receiving port, the first current receiving port is connected to the first output end of the second filtering circuit, the second current receiving port is connected to the second output end of the second filtering circuit, and the first current receiving port and the second current receiving port are used to receive the current.

7. The electric quantity detection circuit according to claim 4, characterized in that: The power detection circuit also includes an isolation circuit and a control chip. The isolation circuit connects the processing chip and the control chip, and is used to receive the input power output by the processing chip and output the input power to the control chip.

8. The electric quantity detection circuit according to claim 7, characterized in that: The isolation circuit comprises a first isolation circuit and a second isolation circuit, wherein the first isolation circuit is connected to the processing chip and the control chip, and is used to receive the input power output by the processing chip and output the input power to the control chip; The second isolation circuit is connected to the processing chip and the control chip, and is used for receiving a feedback signal from the control chip and outputting the feedback signal to the processing chip.

9. The electric quantity detection circuit according to claim 8, characterized in that: The processing chip further includes a data receiving port and a data sending port, wherein the data receiving port is connected to the output end of the first isolation circuit, and the data sending port is connected to the input end of the second isolation circuit.

10. A power strip, characterized in that: The invention comprises a power detection circuit as described in any one of claims 1 to 9.

Images