Electric power measurement circuit and power strip

Abstract

An electric power measurement circuit (10) and a power strip. A connection cable of the power strip (20) comprises a first live wire branch (L1), a second live wire branch (L2) and a neutral wire (N). The electric power measurement circuit (10) comprises: a metering circuit (11), a current measuring circuit (12) and a voltage measuring circuit (13). In the voltage measuring circuit (13), an input end of a voltage transformer (100) is separately connected to the first live wire branch (L1) and the second live wire branch (L2), and an output end of the voltage transformer (100) is connected to the metering circuit (11); the voltage transformer (100) is used for voltage isolation between the first live wire branch (L1) and the second live wire branch (L2); the voltage measuring circuit (13) is used for measuring the voltage of the connection cable and outputting the voltage to the metering circuit (11). The electric power measurement circuit (10) can measure the current and the voltage of the connection cable and, by means of calculation, obtain the input power of the connection cable and electric power consumption. The input power is calculated on the basis of the current and the voltage of the connection cable, and the voltage transformer (100) is used for voltage isolation between the live wire branches, so as to prevent an anomaly of any one of the live wire branches from affecting voltage measurement for the other branch, thereby improving the accuracy of electric power measurement.

Description

Power detection circuit and power strip

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese patent application 2024209021356, filed on April 26, 2024, entitled “Power Detection Circuit and Power Strip”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the technical field of smart sockets, and more particularly to a power detection circuit and a power strip. Background Technology

[0004] A power strip is a multi-outlet socket with a power cord and plug that can be moved. To monitor the power consumption of electrical appliances in real time for power control or to ensure electrical safety, more and more power strips are equipped with power detection functions. However, in current technology, power strips use relays to control the AC input of multiple outlets. If the power supply to one outlet is abnormal, causing the relay to disconnect, it will result in the inability to collect valid power consumption data, leading to low accuracy in power detection.

[0005] Application content

[0006] In view of the problems existing in the background technology, the purpose of this application is to provide a power detection circuit and a power strip, which obtains the current of the connecting wire by detecting the current of the neutral wire, obtains the voltage of the connecting wire by detecting the voltage of the live wire branch, and then calculates the input power and power consumption. The input power can be calculated based on the current and voltage of the connecting wire, which can improve the accuracy of power detection.

[0007] To achieve the above objectives, this application provides a power detection circuit for use in a power strip. The power strip's connecting wires include a first live wire branch, a second live wire branch, and a neutral wire. The power detection circuit includes: a metering circuit; a current detection circuit, the input terminal of which is connected to the neutral wire, and the output terminal of which is connected to the metering circuit, for detecting the current in the connecting wires and outputting the current to the metering circuit; and a voltage detection circuit, including a voltage transformer, the first input terminal of which is connected to the first live wire branch, the second input terminal of which is connected to the second live wire branch, and the output terminal of which is connected to the metering circuit. The voltage transformer is used to collect the voltages of the first and second live wire branches respectively. The voltage detection circuit is used to detect the voltage in the connecting wires 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.

[0008] The voltage detection circuit includes a voltage transformer, which 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 wire. The second end of the first primary winding is connected to the first live wire branch, and the second end of the second primary winding is connected to the second live wire branch. The secondary winding is connected to the metering circuit. The second end of the first primary winding is the first input terminal, and the second end of the second primary winding is the second input terminal.

[0009] The voltage detection circuit further 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, and 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, and 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.

[0010] The metering circuit includes a processing chip, which includes a voltage receiving port connected to the second end of the secondary winding for receiving the voltage.

[0011] The current detection circuit includes a sampling resistor and a second filter circuit. The sampling resistor is connected in series with the neutral line, and the second filter circuit is connected in parallel with the sampling resistor. The first output terminal and the second output terminal of the second filter circuit are connected to the processing chip.

[0012] The processing chip further includes a first current receiving port and a second current receiving port. The first current receiving port is connected to the first output terminal of the second filter circuit, and the second current receiving port is connected to the second output terminal of the second filter circuit. The first current receiving port and the second current receiving port are used to receive the current.

[0013] 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.

[0014] 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 from the control chip and output the feedback signal to the processing chip.

[0015] The processing chip further includes a data receiving port and a data sending port. The data receiving port is connected to the output of the first isolation circuit, and the data sending port is connected to the input of the second isolation circuit.

[0016] To achieve the above objectives, this application also provides a power strip including the power detection circuit described above.

[0017] The power detection circuit of this application obtains the current of the connecting wire by detecting the current of the neutral wire and the voltage of the connecting wire by detecting the voltage of the live wire branch. Then, it calculates the input power and power consumption. The input power is calculated based on the current and voltage of the connecting wire. At the same time, the voltage of each live wire branch is isolated by a voltage transformer to avoid the voltage detection of the other branches being affected when any one of the live wire branches is abnormal, which can improve the accuracy of power detection. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 is a schematic diagram of the framework of an embodiment of the power detection circuit of this application;

[0020] Figure 2 is a circuit diagram of an embodiment of the power detection circuit of this application;

[0021] Figure 3 is a schematic diagram of the structure of one embodiment of the power strip of this application. Detailed Implementation

[0022] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the application. Similarly, the following embodiments are only some, not all, embodiments of the present application, and all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present application.

[0023] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0024] In the description of this application, it is necessary to specify that, unless otherwise expressly stated and limited, the terms "installation," "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or a connection through an intermediate medium. Those skilled in the art will understand the specific meanings of the above terms within the context of this application.

[0025] In the description of this application, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0026] In this document, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " generally indicates that the preceding and following related objects have an "or" relationship. Furthermore, "many" in this document means two or more. Moreover, the term "at least one" in this document means any combination of at least two of any one or more of a plurality of objects. 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.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] In existing technologies, power strips often use relays to control the output of multiple sockets. When the power supply of one of the circuits is abnormal, causing the relay in that circuit to disconnect, it will result in the inability to collect effective power consumption data and low accuracy of power detection.

[0029] Please refer to Figure 1, which is a schematic diagram of an embodiment of the power detection circuit of this application. The power detection circuit 10 of this application is applied to a power strip, wherein the power strip includes multiple sockets, and multiple electrical devices can be connected to the mains power through the multiple sockets. In this embodiment, the power strip with two sockets is used as an example for explanation. The connection wires of the power strip include a live wire L and a neutral wire N. The live wire L includes a first live wire branch L1 and a second live wire branch L2. The power supply to the corresponding socket is controlled by controlling the on / off state of the first live wire branch L1 and the second live wire branch L2 through a relay. For example, the first live wire branch L1 and the neutral wire N of the power strip can be connected to a 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 a second electrical device through the second socket to supply power to the second electrical device.

[0030] As shown in Figure 1, the power detection circuit 10 of this embodiment includes a metering circuit 11, a current detection circuit 12, and a voltage detection circuit 13.

[0031] The input terminal of the current detection circuit 12 is connected to the neutral line N, and the output terminal of the current detection circuit 12 is connected to the metering circuit 11 to detect the current of the connecting line so as to output current to the metering circuit 11.

[0032] In this embodiment, the input power of the power strip during power supply is obtained by detecting the current of the neutral wire N and the voltage of the live wire L through the metering circuit 11.

[0033] The voltage detection circuit 13 includes a voltage transformer 100. The first input terminal of the voltage transformer 100 is connected to the first live wire branch L1, the second input terminal of the voltage transformer 100 is connected to the second live wire branch L2, and the output terminal of the voltage transformer 100 is connected to the metering circuit 11. The voltage detection circuit 13 is used to detect the voltage of the connecting wire and output voltage to the metering circuit 11. The voltage transformer 100 is used to isolate the voltages of the first live wire branch L1 and the second live wire branch L2, preventing a short circuit in one of the first or second live wire branches from affecting the voltage detection of the other live wire branch and thus the voltage detection efficiency of the connecting wire.

[0034] The metering circuit 11 receives current and voltage, and calculates the input power based on the current and voltage. Optionally, the power detection circuit 10 also includes a control chip connected to the metering circuit 11 to receive the input power received by the metering circuit 11. The control chip converts the input power into electrical energy consumption to obtain the electrical energy consumption of the device. Furthermore, the control chip can also be connected to a display screen to display the input power, electrical energy consumption of the device, etc.

[0035] In this embodiment, the power detection circuit 10 obtains the current of the connecting wire by detecting the current of the neutral wire N, and obtains the voltage of the connecting wire by detecting the voltage of the live wire branch. Then, it calculates the input power and power consumption. Calculating the input power based on the current and voltage of the connecting wire improves the accuracy of power detection. Simultaneously, the voltage transformer 100 isolates the first live wire branch L1 and the second live wire branch L2, preventing a short circuit in either branch from affecting the voltage detection circuit 13's detection of the voltage of the other live wire branch and thus its detection of the connecting wire voltage. This improves the efficiency of the voltage detection circuit 13 in detecting the connecting wire voltage.

[0036] Please refer to Figure 2, which is a circuit diagram of an embodiment of the power detection circuit of this application.

[0037] 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 with the control chip via the data receiving port RX and the data transmitting port TX.

[0038] 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.

[0039] 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.

[0040] The voltage transformer 100 has a primary winding comprising a first primary winding 101 and a second primary winding 102. It is understood that in other embodiments, if the connector wires include multiple live wire branches, the voltage transformer 100 includes multiple primary windings, with each primary winding corresponding to one of the multiple live wire branches.

[0041] Specifically, the voltage change in 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 in 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.

[0042] 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, preventing the first live wire branch L1 and the second live wire branch L2 from short-circuiting.

[0043] Even when a power supply failure occurs in one of the power supply lines, the live wire voltage can still be effectively detected. The voltage transformer 100 can accurately capture voltage changes in the live wire L, thereby improving the accuracy of the voltage detection circuit 13 in detecting the live wire voltage and thus improving the accuracy of power consumption detection. Furthermore, when the power strip has multiple outlets, by increasing the number of primary windings in the voltage transformer 100 while keeping the secondary windings unchanged, the power consumption of multiple outlets can be detected, further improving the accuracy of power consumption detection.

[0044] 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.

[0045] The first voltage divider circuit 104 includes multiple resistors connected in series, used to divide and sample the voltage of the first live wire branch L1. The second voltage divider circuit 105 includes multiple resistors connected in series, used to divide and sample the voltage of the second live wire branch L2.

[0046] 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, and the second end of the voltage divider resistor 1061 is grounded. The filter capacitor 1062 is connected in parallel across the two ends of the voltage divider resistor 1061.

[0047] The current detection circuit 12 includes a sampling resistor 108 and a second filter circuit 109. The sampling resistor 108 is connected in series with the neutral line N. The second filter circuit 109 is connected in parallel with the sampling resistor 108. The first output terminal of the second filter circuit 109 and the second output terminal of the second filter circuit 109 are connected to the metering circuit 11.

[0048] The sampling resistor 108 can be a manganin resistor. The smaller resistance value of the sampling resistor 108 improves the accuracy of neutral current detection. For example, the resistance value of the sampling resistor 108 can be 1 milliohm, 10 milliohm, or 100 milliohm.

[0049] 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 terminal of the first resistor 1091 is connected to the first terminal of the sampling resistor 108, and the second terminal of the first resistor 1091 is grounded through the first capacitor 1093. The first terminal of the second resistor 1092 is connected to the second terminal of the sampling resistor 108, and the second terminal of the second resistor 1092 is grounded through the second capacitor 1094. The second terminal of the first resistor 1091 serves as the first output terminal of the second filter circuit 109, and the second terminal of the second resistor 1092 serves as the second output terminal of the second filter circuit 109.

[0050] The second filter circuit 109 is used to eliminate interference signals, which can improve the reliability, accuracy and security of the acquired voltage data.

[0051] 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 terminal of the second filter circuit 109, and the second current receiving port V1N is connected to the second output terminal of the second filter circuit 109. The first current receiving port V1P and the second current receiving port V1N are used to receive current.

[0052] Optionally, the power detection circuit 10 also includes an isolation circuit 14 and a control chip (not shown). The isolation circuit 14 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.

[0053] As mentioned above, after receiving the voltage transmitted by the voltage detection circuit 13 and the current transmitted by the current detection circuit 12, the processing chip 107 can calculate the input power 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.

[0054] As shown in Figure 2, 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 from the control chip and output the feedback signal to the metering circuit 11.

[0055] 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 to indicate 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 responds that the input power has been successfully transmitted.

[0056] The output of the first isolation circuit 110 is connected to the data transmission port TX of the processing chip 107, and the input of the first isolation circuit 110 is connected to the input port METER_RX of the control chip. The input of the second isolation circuit 111 is connected to the data reception port RX of the processing chip 107, and the output of the second isolation circuit 111 is connected to the output port METER_TX of the control chip.

[0057] The first isolation circuit 110 uses an optocoupler to receive and output input power, and the second isolation circuit 111 uses an optocoupler to receive and output feedback signals. 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.

[0058] 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 terminal of the third resistor 1071 receives a 5V DC voltage, and the second terminal of the third resistor 1071 is connected to the power supply port VDD of the processing chip 107. The first terminal of the third capacitor 1072 is connected to the first terminal of the third resistor 1071, and the second terminal of the third capacitor 1072 is grounded. The first terminal of the fourth capacitor 1073 is connected to the second terminal of the third resistor 1071, and the second terminal of the fourth capacitor 1073 is grounded. The power detection circuit 10 supplies power to the processing chip 107 through the third resistor 1071, the third capacitor 1072, and the fourth capacitor 1073.

[0059] The first terminal of the fifth capacitor 1074 is connected to the reference voltage port VREF of the processing chip 107, and the second terminal of the fifth capacitor 1074 is grounded. The first terminal of the sixth capacitor 1075 is connected to the reference voltage port VREF of the processing chip 107, and the second terminal 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.

[0060] Please refer to Figure 3, which is a structural schematic diagram of an embodiment of the power strip of this application. As shown in Figure 3, the power strip 20 includes a power detection circuit 10.

[0061] In this embodiment, a power strip with two sockets (not shown) is used as an example. The power strip's connecting wires include a live wire L and a neutral wire N. The live wire L includes a first live wire branch L1 and a second live wire branch L2. The power supply to the corresponding socket is controlled by controlling the on / off state of the first live wire branch L1 and the second live wire branch L2 through a relay. In this embodiment, the power detection circuit 10 can detect the current and voltage of the connecting wires 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 device through the power strip 20, thereby obtaining the input power and power consumption.

[0062] In one embodiment, the power strip 20 includes multiple sockets, through which multiple electrical devices can be connected to the mains power. The power detection circuit 10 of this embodiment can obtain the current and voltage of the connecting wires by detecting the current in the neutral wire N and the voltage of multiple live wire branches, thereby obtaining the input power and power consumption.

[0063] In one embodiment, the power strip 20 may further include a communication module (not shown), which is connected to the power detection circuit 10. The communication module receives detection data from the power detection circuit 10, such as voltage, current, input power, and power consumption, and uploads the detection data to an Internet of Things (IoT) platform for storage and processing. Users can remotely monitor or query the detection data to control power consumption or ensure electrical safety.

[0064] In one embodiment, the power strip 20 may further include a display screen connected to a control chip. After the control chip receives the input power and obtains the power consumption of the electrical device, the display screen is used to display the power consumption.

[0065] In this application, the power detection circuit 10 of this embodiment obtains the current of the connecting wire by detecting the current of the neutral wire N, and obtains the voltage of the connecting wire by detecting the voltage of the live wire branch. Then, it calculates the input power and power consumption. Calculating the input power based on the current and voltage of the connecting wire improves the accuracy of power detection. Specifically, the power detection circuit 10, through the voltage transformer 100, can accurately capture the voltage change of the live wire L, thereby improving the accuracy of live wire voltage detection and power detection. Furthermore, the voltage transformer 100 can isolate the voltages of multiple live wire branches, preventing short circuits. In addition, when the power strip includes multiple sockets, by increasing the number of primary windings of the voltage transformer 100 while keeping the secondary windings unchanged, the power consumption of multiple sockets can be detected, improving the accuracy of power detection.

[0066] The embodiments described above do not constitute a limitation on the scope of protection of this technical solution. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the above embodiments are included within the scope of protection of this technical solution.

Claims

1. A power detection circuit, characterized in that, Applied to a power strip, the power strip's connecting wires include a first live wire branch, a second live wire branch, and a neutral wire; the power detection circuit includes: Metering circuit; A current detection circuit, wherein the input terminal of the current detection circuit is connected to the neutral wire, and the output terminal of the current detection circuit is connected to the metering circuit, for detecting the current of the connecting wire and outputting the current to the metering circuit; A voltage detection circuit includes a voltage transformer. The first input terminal of the voltage transformer is connected to a first live wire branch, the second input terminal of the voltage transformer is connected to a second live wire branch, and the output terminal of the voltage transformer is connected to the metering circuit. The voltage transformer is used to collect the voltage of the first live wire branch and the second live wire branch respectively. 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.

2. The power detection circuit according to claim 1, characterized in that, 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 wire. 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. 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.

3. The power detection circuit according to claim 2, characterized in that, The voltage detection circuit further 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, and 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, and 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 power detection circuit according to claim 3, characterized in that, The metering circuit includes a processing chip, which includes a voltage receiving port connected to the second end of the secondary winding for receiving the voltage.

5. The power 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 with the neutral line, and the second filter circuit is connected in parallel with the sampling resistor. The first output terminal and the second output terminal of the second filter circuit are connected to the processing chip.

6. The power detection circuit according to claim 5, characterized in that, The processing chip further includes a first current receiving port and a second current receiving port. The first current receiving port is connected to the first output terminal of the second filter circuit, and the second current receiving port is connected to the second output terminal of the second filter circuit. The first current receiving port and the second current receiving port are used to receive the current.

7. The power 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 power detection circuit according to claim 7, characterized in that, 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 connects the processing chip and the control chip, and is used to receive the feedback signal from the control chip and output the feedback signal to the processing chip.

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

10. A power strip, characterized in that, Includes the power detection circuit as described in any one of claims 1-9.

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