Two-way isolated ac voltage detection device

Abstract

The present application belongs to the technical field of alternating voltage detection, and particularly relates to a two-way isolated alternating voltage detection device. The present application comprises: a voltage sampling isolation module, a communication circuit module, a processor module, a voltage transformer group module, a channel selection module, and an address setting module; the voltage sampling isolation module is connected with the voltage transformer group module; the voltage transformer group module is connected with the channel selection module; the communication circuit module is connected with the channel selection module; the address setting module and the communication circuit module are connected with the processor module respectively. The two-way N-line is completely isolated, the fifth voltage transformer U5, the sixth voltage transformer U6 and the voltage dividing network are used to physically isolate the two-way N-line, and the potential coupling is eliminated. The two-way isolated alternating voltage detection device supports multi-way N-line isolation and modular expansion, is not interfered by the ground loop, has high measurement accuracy, good expansibility, simple structure, and low measurement cost.

Description

Technical Field

[0001] This invention belongs to the field of AC voltage detection technology, and particularly relates to a two-channel isolated AC voltage detection device. Background Technology

[0002] Many devices currently monitor input AC voltage. For example, in the power industry, when using DC power supply cabinets, it's necessary to monitor various information about the cabinet, including its AC input voltage, to ensure reliable and normal operation. There are various methods for detecting input AC voltage, including using AC voltmeters and various sampling devices. However, using AC voltmeters requires regular inspections, which not only increases the workload of staff but also cannot guarantee timely and accurate problem detection, thus compromising the reliable operation of the DC power supply cabinet.

[0003] Traditional voltmeters require periodic on-site readings, resulting in response lag and high labor costs. Existing electronic sampling devices often employ a common ground design, leading to potential coupling between different incoming neutral (N) lines, making it impossible to install residual current devices (RCDs) and posing a risk of electric shock. Current single-channel detection modules have poor scalability; multi-channel measurements require repeated configuration of power and communication modules, resulting in complex cabinet wiring and increased costs. Furthermore, non-isolated sampling is susceptible to ground loop interference, often resulting in measurement accuracy below Class 1, necessitating a mandatory 0.5-class accuracy requirement for DC power supply cabinets. Therefore, there is an urgent need to develop a high-precision detection device that supports multi-channel N-line isolation and modular expansion. Summary of the Invention

[0004] To address the problems of existing AC voltage detection devices, such as susceptibility to ground loop interference, low measurement accuracy, poor scalability, complex structure, and high measurement cost, this invention proposes a two-channel isolated AC voltage detection device, comprising: a voltage sampling isolation module, a communication circuit module, a processor module, a voltage transformer group module, a channel selection module, and an address setting module; the voltage sampling isolation module is connected to the voltage transformer group module; the voltage transformer group module is connected to the channel selection module; the communication circuit module is connected to the channel selection module; and the address setting module and the communication circuit module are respectively connected to the processor module.

[0005] According to the two-channel isolated AC voltage detection device described above, the voltage sampling isolation module includes: a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a third AC voltage input terminal J3, and a fourth AC voltage input terminal J4; One end of the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 are connected in series with the ninth resistor R9, the tenth resistor R10, the eleventh resistor R11, and the twelfth resistor R12, respectively, and the other end is connected to the third AC voltage input terminal J3, respectively. One end of the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, and the eighth resistor R8 are connected in series with the thirteenth resistor R13, the fourteenth resistor R14, the fifteenth resistor R15, and the sixteenth resistor R16, respectively, and the other end is connected to the fourth AC voltage input terminal J4, respectively.

[0006] According to the two-channel isolated AC voltage detection device described above, the channel selection module includes: decoding chip U10, fifth diode D5, sixth diode D6, seventh diode D7, eighth diode D8, ninth diode D9, tenth diode D10, twenty-fifth resistor R25, twenty-sixth resistor R26, first optocoupler solid-state relay K1, second optocoupler solid-state relay K2, third optocoupler solid-state relay K3, and fourth optocoupler solid-state relay K4; The voltage transformer module includes: a fifth voltage transformer U5, a sixth voltage transformer U6, a seventeenth resistor R17, an eighteenth resistor R18, a twelfth diode D12, and an eleventh diode D11; one end of the fifth diode D5 is electrically connected to the decoding chip U10 and the first optocoupler solid-state relay K1, and the other end of the fifth diode D5 is electrically connected to the second optocoupler solid-state relay K2; one end of the sixth diode D6 is electrically connected to the decoding chip U10 and the first optocoupler solid-state relay K1, and the other end of the sixth diode D6 is electrically connected to the second optocoupler solid-state relay K2; one end of the seventh diode D7 is connected to the decoding chip U10... 10. The second optocoupler solid-state relay K2 is electrically connected; the other end of the seventh diode D7 is electrically connected to the second optocoupler solid-state relay K2; one end of the eighth diode D8 is electrically connected to the decoder chip U10 and the third optocoupler solid-state relay K3, and the other end of the eighth diode D8 is electrically connected to the fourth optocoupler solid-state relay K4; one end of the ninth diode D9 is electrically connected to the decoder chip U10 and the third optocoupler solid-state relay K3, and the other end of the ninth diode D9 is electrically connected to the fourth optocoupler solid-state relay K4; one end of the tenth diode D10 is electrically connected to the decoder chip U10 and the fourth optocoupler solid-state relay K4, and the tenth... The other end of diode D10 is electrically connected to the fourth optocoupler solid-state relay K4; one end of the twenty-fifth resistor R25 is electrically connected to the first optocoupler solid-state relay K1, the second optocoupler solid-state relay K2, the third optocoupler solid-state relay K3, and the fourth optocoupler solid-state relay K4, and the other end of the twenty-fifth resistor R25 is connected to voltage VCC; one end of the twenty-sixth resistor R26 is electrically connected to the second optocoupler solid-state relay K2 and the fourth optocoupler solid-state relay K4, and the other end of the twenty-sixth resistor R26 is connected to voltage VCC; the first optocoupler solid-state relay K1 is electrically connected to the ninth resistor R9, the tenth resistor R10, and the fifth... Voltage transformer U5 and second optocoupler solid-state relay K2 are electrically connected; second optocoupler solid-state relay K2 is electrically connected to eleventh resistor R11, twelfth resistor R12 and fifth voltage transformer U5 respectively; fifth voltage transformer U5 is connected in parallel with seventeenth resistor R17 and twelfth diode D12 respectively; third optocoupler solid-state relay K3 is electrically connected to thirteenth resistor R13, fourteenth resistor R14, sixth voltage transformer U6 and fourth optocoupler solid-state relay K4 respectively; fourth optocoupler solid-state relay K4 is electrically connected to fifteenth resistor R15, sixteenth resistor R16 and sixth voltage transformer U6 respectively;The sixth voltage transformer U6 is connected in parallel with the eighteenth resistor R18 and the eleventh diode D11.

[0007] According to the above-described two-channel isolated AC voltage detection device, the processor module includes: processor U1, second terminal block J2, 28th resistor R28, 29th resistor R29, 30th resistor R30, 31st resistor R31, 32nd resistor R32, first capacitor C1, fourth capacitor C4, quartz crystal resonator Y1, first terminal block J1, 27th resistor R27, and seventh capacitor C7; the address setting module includes: second DIP switch S2 and first switch S1; the communication circuit module includes: 11th communication chip U11; second terminal block... J2, the second DIP switch S2, the twenty-eighth resistor R28, the twenty-ninth resistor R29, the thirtieth resistor R30, the thirty-first resistor R31, the thirty-second resistor R32, the first capacitor C1, the fourth capacitor C4, the quartz crystal resonator Y1, the first terminal J1, the twenty-seventh resistor R27, and the eleventh communication chip U11 are all electrically connected to the processor U1; one end of the seventh capacitor C7 is electrically connected to one end of the twenty-seventh resistor R27, and the other end of the seventh capacitor C7 is grounded; the other end of the twenty-seventh resistor R27 is electrically connected to the first terminal J1.

[0008] According to the above-described two-channel isolated AC voltage detection device, the decoding chip U10 is model 74HC138; the first optocoupler solid-state relay K1, the second optocoupler solid-state relay K2, the third optocoupler solid-state relay K3, and the fourth optocoupler solid-state relay K4 are all model AQW214EH; one end of the fifth diode D5 is electrically connected to pin 14 of the decoding chip U10 and pin 2 of the first optocoupler solid-state relay K1, and the other end of the fifth diode D5 is electrically connected to pin 4 of the second optocoupler solid-state relay K2; one end of the sixth diode D6 is electrically connected to pin 13 of the decoding chip U10 and pin 4 of the first optocoupler solid-state relay K1, and the other end of the sixth diode D6 is electrically connected to pin 4 of the second optocoupler solid-state relay K2; one end of the seventh diode D7 is electrically connected to pin 12 of the decoding chip U10 and pin 13 ...5 is electrically connected to pin 13 of the decoding chip U10 and pin 4 of the first optocoupler solid-state relay K1, and the other end of the seventh diode D7 is electrically connected to pin 12 of the decoding chip U10 and pin 13 of the first optocoupler solid-state relay Pin 2 of the second optocoupler solid-state relay K2 is electrically connected; the other end of the seventh diode D7 is electrically connected to pin 4 of the second optocoupler solid-state relay K2; one end of the eighth diode D8 is electrically connected to pin 11 of the decoder chip U10 and pin 2 of the third optocoupler solid-state relay K3, and the other end of the eighth diode D8 is electrically connected to pin 4 of the fourth optocoupler solid-state relay K4; one end of the ninth diode D9 is electrically connected to pin 10 of the decoder chip U10 and pin 4 of the third optocoupler solid-state relay K3, and the other end of the ninth diode D9 is electrically connected to pin 4 of the fourth optocoupler solid-state relay K4; one end of the tenth diode D10 is electrically connected to pin 9 of the decoder chip U10 and pin 2 of the fourth optocoupler solid-state relay K4, and the other end of the tenth diode D10 is electrically connected to pin 4 of the fourth optocoupler solid-state relay K4. One end of the twenty-fifth resistor R25 is electrically connected to pin 1 and pin 3 of the first optocoupler solid-state relay K1, pin 1 of the second optocoupler solid-state relay K2, pin 1 and pin 3 of the third optocoupler solid-state relay K3, and pin 1 of the fourth optocoupler solid-state relay K4, respectively; one end of the twenty-sixth resistor R26 is electrically connected to pin 3 of the second optocoupler solid-state relay K2 and pin 3 of the fourth optocoupler solid-state relay K4, respectively.

[0009] According to the two-channel isolated AC voltage detection device described above, the fifth voltage transformer U5 and the sixth voltage transformer U6 are both fully enclosed current-type voltage transformers of model TV0815-1; pins 8, 6, and 7 of the first optocoupler solid-state relay K1 are electrically connected to one end of the ninth resistor R9, one end of the tenth resistor R10, and pin 4 of the fifth voltage transformer U5, respectively; pins 7 and 5 of the first optocoupler solid-state relay K1 are electrically connected to pin 7 of the second optocoupler solid-state relay K2; pins 8, 6, and 7 of the second optocoupler solid-state relay K2 are electrically connected to one end of the eleventh resistor R11, one end of the twelfth resistor R12, and pin 4 of the fifth voltage transformer U5, respectively; pin 5 of the second optocoupler solid-state relay K2 is electrically connected to pin 1 of the fifth voltage transformer U5; the two ends of the seventeenth resistor R17 are electrically connected to pins 2 and 3 of the fifth voltage transformer U5, respectively. The pins 8, 6, and 7 of the third optocoupler solid-state relay K3 are electrically connected to the thirteenth resistor R13, the fourteenth resistor R14, and the pin 4 of the sixth voltage transformer U6, respectively. The pins 5 and 7 of the third optocoupler solid-state relay K3 are then electrically connected to the pin 7 of the fourth optocoupler solid-state relay K4. The pins 8, 6, and 7 of the fourth optocoupler solid-state relay K4 are electrically connected to one end of the fifteenth resistor R15, one end of the sixteenth resistor R16, and the pin 4 of the sixth voltage transformer U6, respectively. The pin 5 of the fourth optocoupler solid-state relay K4 is electrically connected to the pin 1 of the sixth voltage transformer U6. The two ends of the eighteenth resistor R18 are electrically connected to the pins 2 and 3 of the sixth voltage transformer U6, respectively. One end of the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 are electrically connected to the pins 1, 3, 5, and 7 of the third AC voltage input terminal J3, respectively. The fifth resistor R5, the sixth resistor R6, the seventh resistor R7, and the eighth resistor R8 are electrically connected to pins 1, 3, 5, and 7 of the fourth AC voltage input terminal J4, respectively.

[0010] According to the two-channel isolated AC voltage detection device described above, the processor U1 is model M430FE4232, the second terminal J2 is model CON10J, and the second DIP switch S2 is a four-position DIP switch; pins 1, 3, 5, 7, and 10 of the second terminal J2 are electrically connected to pins 54, 55, 56, 57, and 58 of the processor U1, respectively; pin 2 of the second terminal J2 is connected to a +3.3V voltage; the pins of the second terminal J2... Pin 9 is grounded; pins 5-8 of the second DIP switch S2 are electrically connected to pins 45, 44, 46, and 47 of the processor U1, respectively; pins 1-4 of the second DIP switch S2 are grounded and then connected to one end of the first switch S1; the other end of the first switch S1 is electrically connected to pin 48 of the processor U1; one end of the first capacitor C1 is grounded, and the other end is electrically connected to pin 10 of the processor U1; the two ends of the quartz crystal resonator Y1 are connected to pins 8 and 9 of the processor U1, respectively.

[0011] According to the two-way isolated AC voltage detection device described above, pin 1 of the first terminal J1 is connected to a +3.3V voltage; pin 2 of the first terminal J1 is electrically connected to pin 64 and pin 1 of the processor U1; pin 3 of the first terminal J1 is electrically connected to one end of the twenty-seventh resistor R27; the other end of the twenty-seventh resistor R27 is electrically connected to pin 58 of the processor U1 and one end of the seventh capacitor C7, respectively; the other end of the seventh capacitor C7 is grounded.

[0012] According to the two-channel isolated AC voltage detection device described above, the model of the eleventh communication chip U11 is ADM2483; pins 1 and 2 of the eleventh communication chip U11 are electrically connected and then connected to +5V voltage; pin 3 of the eleventh communication chip U11 is electrically connected to pin 59 of the processor U1; pins 4 and 5 of the eleventh communication chip U11 are electrically connected and then connected to pin 61 of the processor U1; pin 6 of the eleventh communication chip U11 is electrically connected to pin 60 of the processor U1; pins 7 and 8 of the eleventh communication chip U11 are electrically connected and then grounded; pins 9 and 10 of the eleventh communication chip U11 are electrically connected and then grounded; pin 16 of the eleventh communication chip U11 is connected to +5V voltage.

[0013] Based on the above-described two-channel isolated AC voltage detection device, multiple devices are connected in parallel via an RS485 bus. The address of each device is set by the second DIP switch S2, and a 120Ω matching resistor is connected to the RS485 bus terminal.

[0014] The beneficial effects of this invention are as follows: 1. Complete isolation of the two neutral (N) lines: The two N lines are physically isolated by the fifth voltage transformer U5, the sixth voltage transformer U6, and the voltage divider network, eliminating potential coupling. Testing shows that the insulation resistance between the two N lines is >100MΩ, meeting the installation requirements for residual current devices and reducing the electric shock accident rate.

[0015] 2. Modular expansion capability. A single device integrates two measurement channels. When connected in parallel via an RS485 bus, the second DIP switch S2 supports cascading up to 16 units. Actual testing shows that only 5 devices are needed for 10-channel measurements, saving cabinet space and reducing wiring.

[0016] 3. 0.2-level high-precision measurement. The 204kΩ voltage divider resistors (i.e., each resistor from the first resistor R1 to the sixteenth resistor R16 has a resistance of 51kΩ) have a tolerance of ±0.1%, which is matched with the 250Ω sampling resistors (i.e., the seventeenth resistor R17 and the eighteenth resistor R18) at ±0.05%. The nonlinearity of the fifth voltage transformer U5 and the sixth voltage transformer U6 is <0.05%. Within the 100-300V range, the error is ≤±0.2%, which is 5 times more accurate than the industry-standard Class 1 meters.

[0017] 4. Strong anti-interference characteristics. The fifth voltage transformer U5 and the sixth voltage transformer U6 are model TV0815-1, which suppresses common-mode interference. The eleventh communication chip U11 is model ADM2483, and its 3kV isolation barrier blocks ground loops. Comparative tests show that under 4kV lightning surge conditions, the reading fluctuation of this device is <0.5%, while the fluctuation of the traditional solution exceeds 5%.

[0018] 5. Unmanned intelligent monitoring. The RS485 bus of the communication circuit module supports the Modbus RTU protocol, uploading 12 channels of data per second. Replacing manual inspections significantly reduces fault response time and greatly lowers maintenance labor costs. Attached Figure Description

[0019] Figure 1 This is a simplified circuit diagram of the dual-channel isolated AC voltage detection device of the present invention.

[0020] Figure 2 This is a circuit diagram of the processor module and channel selection module of the dual-channel isolated AC voltage detection device of the present invention.

[0021] Figure 3 This is a circuit diagram of the voltage sampling isolation module of the two-channel isolated AC voltage detection device of the present invention.

[0022] Figure 4 This is a circuit diagram of the address setting module of the dual-channel isolated AC voltage detection device of the present invention.

[0023] Figure 5This is a circuit diagram of the communication circuit module of the two-channel isolated AC voltage detection device of the present invention. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0025] like Figure 2 The diagram shows the circuit structure of the processor module and channel selection module of the dual-channel isolated AC voltage detection device of the present invention. In this circuit, the third AC voltage input terminal J3 and the fourth AC voltage input terminal J4 are AC voltage input terminals; to ensure wiring safety and improve the withstand voltage level between the terminals, one terminal is left unused between each phase connection.

[0026] The fifth voltage transformer U5 and the sixth voltage transformer U6 are fully enclosed current-type voltage transformers, model TV0815-1, with a rated output ratio of 2mA / 2mA. If the input current is 2mA, the output current is also 2mA. Since this voltage transformer is current-type, the output side cannot be open-circuited. In this circuit, a 250Ω precision resistor, the seventeenth resistor R17 and the eighteenth resistor R18, are connected in series on the output side. The first resistor R1 to the sixteenth resistor R16 are all precision resistors, connected in series in the input circuit of the voltage transformer group module 400. The decoding chip U10 is a model 74HC138 decoding chip, responsible for selecting which channel of AC voltage to acquire.

[0027] The first optocoupler solid-state relay K1, the second optocoupler solid-state relay K2, the third optocoupler solid-state relay K3, and the fourth optocoupler solid-state relay K4 are optocoupler solid-state relays used as switches in the circuit. The twenty-fifth resistor R25 and the twenty-sixth resistor R26 are current-limiting resistors on the input side of the optocoupler solid-state relays.

[0028] exist Figure 2The system can measure six phase voltages. The following explanation uses the measurement of phase A of AC voltage #1 as an example. When pins 1, 2, and 3 of the decoder chip U10 are high, low, and low respectively, output pin 14 is low, and the remaining output pins are high. At this time, the photodiode connected to pin 2 of the first optocoupler solid-state relay K1 and pin 4 of the second optocoupler solid-state relay K2 is turned on, while the others are turned off. The corresponding switching transistor is turned on. This allows the phase A voltage of AC voltage #1 to return to the N-level of AC voltage #1 through the first resistor R1, the ninth resistor R9, the primary side of the fifth transformer U5, the twelfth resistor R12, and the fourteenth resistor R14, forming a power supply loop. If the phase A voltage is equal to 220V, the primary current of the transformer is equal to 220V divided by 51KΩ multiplied by 4, which is 1.0784mA. The secondary current of the voltage transformer module should also be 1.0784 mA, and the voltage of the sampling network AC1_DAT is equal to 269.6 millivolts. By sampling this voltage, the voltage of phase A of AC voltage #1 can be calculated to be 220V. To sample other voltages, change the voltage levels of pins 1, 2, and 3 of the decoder chip U10, and then read the corresponding sampling network AC1_DAT or AC2_DAT.

[0029] Figure 5 This is the circuit structure diagram of the communication circuit module. The processor U1 chip is model M430FE4232. This chip has a power supply voltage of 3.3V, an external crystal oscillator of 32.768K, and capacitors C1 and C4 are reference voltage filter capacitors. Terminals J1 and J2 are debugging interfaces used during development and debugging. The second DIP switch S2 is a four-position DIP switch used to set the address of the detection device. The first switch S1 is a push-button switch used during debugging. The detection device communicates using RS485 communication. The eleventh communication chip U11 is model ADM2483. The ADM2483 is an RS485 transceiver with a three-channel isolator, designed to support high-speed data transmission and compatible with 3V / 5V logic operation, ensuring stability and device compatibility.

[0030] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A dual-channel isolated AC voltage detection device, characterized in that, include: Voltage sampling isolation module (100), communication circuit module (200), processor module (300), voltage transformer group module (400), channel selection module (500), address setting module (600); The voltage sampling isolation module (100) is connected to the voltage transformer group module (400); the voltage transformer group module (400) is connected to the channel selection module (500); the communication circuit module (200) is connected to the channel selection module (500); the address setting module (600) and the communication circuit module (200) are respectively connected to the processor module (300).

2. The dual-channel isolated AC voltage detection device according to claim 1, characterized in that, The voltage sampling isolation module (100) includes: a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a third AC voltage input terminal J3, and a fourth AC voltage input terminal J4; One end of the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 are connected in series with the ninth resistor R9, the tenth resistor R10, the eleventh resistor R11, and the twelfth resistor R12, respectively, and the other end is connected to the third AC voltage input terminal J3, respectively. One end of the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, and the eighth resistor R8 are connected in series with the thirteenth resistor R13, the fourteenth resistor R14, the fifteenth resistor R15, and the sixteenth resistor R16, respectively, and the other end is electrically connected to the fourth AC voltage input terminal J4.

3. The dual-channel isolated AC voltage detection device according to claim 2, characterized in that, The channel selection module (500) includes: a decoder chip U10, a fifth diode D5, a sixth diode D6, a seventh diode D7, an eighth diode D8, a ninth diode D9, a tenth diode D10, a twenty-fifth resistor R25, a twenty-sixth resistor R26, a first optocoupler solid-state relay K1, a second optocoupler solid-state relay K2, a third optocoupler solid-state relay K3, and a fourth optocoupler solid-state relay K4; The voltage transformer module (400) includes: the fifth voltage transformer U5, the sixth voltage transformer U6, the seventeenth resistor R17, the eighteenth resistor R18, the twelfth diode D12, and the eleventh diode D11; One end of the fifth diode D5 is electrically connected to the decoder chip U10 and the first optocoupler solid-state relay K1, and the other end of the fifth diode D5 is electrically connected to the second optocoupler solid-state relay K2; one end of the sixth diode D6 is electrically connected to the decoder chip U10 and the first optocoupler solid-state relay K1, and the other end of the sixth diode D6 is electrically connected to the second optocoupler solid-state relay K2; one end of the seventh diode D7 is electrically connected to the decoder chip U10 and the second optocoupler solid-state relay K2, and the other end of the seventh diode D7 is electrically connected to the second optocoupler solid-state relay K2; One end of diode D8 is electrically connected to decoder chip U10 and third optocoupler solid-state relay K3, and the other end of diode D8 is electrically connected to fourth optocoupler solid-state relay K4; one end of diode D9 is electrically connected to decoder chip U10 and third optocoupler solid-state relay K3, and the other end of diode D9 is electrically connected to fourth optocoupler solid-state relay K4; one end of diode D10 is electrically connected to decoder chip U10 and fourth optocoupler solid-state relay K4, and the other end of diode D10 is electrically connected to fourth optocoupler solid-state relay K4. One end of the 25th resistor R25 is electrically connected to the first optocoupler solid-state relay K1, the second optocoupler solid-state relay K2, the third optocoupler solid-state relay K3, and the fourth optocoupler solid-state relay K4, respectively, and the other end of the 25th resistor R25 is connected to the voltage VCC. One end of the twenty-sixth resistor R26 is electrically connected to the second optocoupler solid-state relay K2 and the fourth optocoupler solid-state relay K4 respectively, and the other end of the twenty-sixth resistor R26 is connected to the voltage VCC. The first optocoupler solid-state relay K1 is electrically connected to the ninth resistor R9, the tenth resistor R10, the fifth voltage transformer U5, and the second optocoupler solid-state relay K2, respectively. The second optocoupler solid-state relay K2 is electrically connected to the eleventh resistor R11, the twelfth resistor R12, and the fifth voltage transformer U5, respectively. The fifth voltage transformer U5 is connected in parallel with the seventeenth resistor R17 and the twelfth diode D12. The third optocoupler solid-state relay K3 is electrically connected to the thirteenth resistor R13, the fourteenth resistor R14, the sixth voltage transformer U6, and the fourth optocoupler solid-state relay K4, respectively. The fourth optocoupler solid-state relay K4 is electrically connected to the fifteenth resistor R15, the sixteenth resistor R16, and the sixth voltage transformer U6, respectively. The sixth voltage transformer U6 is connected in parallel with the eighteenth resistor R18 and the eleventh diode D11.

4. The dual-channel isolated AC voltage detection device according to claim 3, characterized in that, The processor module (300) includes: processor U1, second terminal J2, twenty-eighth resistor R28, twenty-ninth resistor R29, thirtieth resistor R30, thirty-first resistor R31, thirty-second resistor R32, first capacitor C1, fourth capacitor C4, quartz crystal resonator Y1, first terminal J1, twenty-seventh resistor R27, and seventh capacitor C7. The address setting module (600) includes: a second DIP switch S2 and a first switch S1; The communication circuit module (200) includes: the eleventh communication chip U11; The second terminal block J2, the second DIP switch S2, the twenty-eighth resistor R28, the twenty-ninth resistor R29, the thirtieth resistor R30, the thirty-first resistor R31, the thirty-second resistor R32, the first capacitor C1, the fourth capacitor C4, the quartz crystal resonator Y1, the first terminal block J1, the twenty-seventh resistor R27, and the eleventh communication chip U11 are electrically connected to the processor U1. One end of the seventh capacitor C7 is electrically connected to one end of the twenty-seventh resistor R27, and the other end of the seventh capacitor C7 is grounded; the other end of the twenty-seventh resistor R27 is electrically connected to the first terminal J1.

5. The dual-channel isolated AC voltage detection device according to claim 4, characterized in that, The decoding chip U10 is model 74HC138; the first optocoupler solid-state relay K1, the second optocoupler solid-state relay K2, the third optocoupler solid-state relay K3, and the fourth optocoupler solid-state relay K4 are all model AQW214EH. One end of the fifth diode D5 is electrically connected to pin 14 of the decoder chip U10 and pin 2 of the first optocoupler solid-state relay K1, and the other end of the fifth diode D5 is electrically connected to pin 4 of the second optocoupler solid-state relay K2; one end of the sixth diode D6 is electrically connected to pin 13 of the decoder chip U10 and pin 4 of the first optocoupler solid-state relay K1, and the other end of the sixth diode D6 is electrically connected to pin 4 of the second optocoupler solid-state relay K2; one end of the seventh diode D7 is electrically connected to pin 12 of the decoder chip U10 and pin 2 of the second optocoupler solid-state relay K2, and the other end of the seventh diode D7 is electrically connected to pin 4 of the second optocoupler solid-state relay K2. One end of the eighth diode D8 is electrically connected to pin 11 of the decoder chip U10 and pin 2 of the third optocoupler solid-state relay K3, and the other end of the eighth diode D8 is electrically connected to pin 4 of the fourth optocoupler solid-state relay K4; one end of the ninth diode D9 is electrically connected to pin 10 of the decoder chip U10 and pin 4 of the third optocoupler solid-state relay K3, and the other end of the ninth diode D9 is electrically connected to pin 4 of the fourth optocoupler solid-state relay K4; one end of the tenth diode D10 is electrically connected to pin 9 of the decoder chip U10 and pin 2 of the fourth optocoupler solid-state relay K4, and the other end of the tenth diode D10 is electrically connected to pin 4 of the fourth optocoupler solid-state relay K4. One end of the 25th resistor R25 is electrically connected to pin 1 and pin 3 of the first optocoupler solid-state relay K1, pin 1 of the second optocoupler solid-state relay K2, pin 1 and pin 3 of the third optocoupler solid-state relay K3, and pin 1 of the fourth optocoupler solid-state relay K4. One end of the twenty-sixth resistor R26 is electrically connected to pin 3 of the second optocoupler solid-state relay K2 and pin 3 of the fourth optocoupler solid-state relay K4, respectively.

6. The dual-channel isolated AC voltage detection device according to claim 5, characterized in that, The fifth voltage transformer U5 and the sixth voltage transformer U6 are both fully enclosed current-type voltage transformers of model TV0815-1. Pins 8, 6, and 7 of the first optocoupler solid-state relay K1 are electrically connected to one end of the ninth resistor R9, one end of the tenth resistor R10, and pin 4 of the fifth voltage transformer U5, respectively. Pins 7 and 5 of the first optocoupler solid-state relay K1 are electrically connected to pin 7 of the second optocoupler solid-state relay K2. Pins 8, 6, and 7 of the second optocoupler solid-state relay K2 are electrically connected to one end of the eleventh resistor R11, one end of the twelfth resistor R12, and pin 4 of the fifth voltage transformer U5, respectively; pin 5 of the second optocoupler solid-state relay K2 is electrically connected to pin 1 of the fifth voltage transformer U5. The seventeenth resistor R17 is electrically connected to pins 2 and 3 of the fifth voltage transformer U5, respectively. Pins 8, 6, and 7 of the third optocoupler solid-state relay K3 are electrically connected to pin 4 of the thirteenth resistor R13, the fourteenth resistor R14, and the sixth voltage transformer U6, respectively; pins 5 and 7 of the third optocoupler solid-state relay K3 are electrically connected to pin 7 of the fourth optocoupler solid-state relay K4. Pins 8, 6, and 7 of the fourth optocoupler solid-state relay K4 are electrically connected to one end of the fifteenth resistor R15, one end of the sixteenth resistor R16, and pin 4 of the sixth voltage transformer U6, respectively; pin 5 of the fourth optocoupler solid-state relay K4 is electrically connected to pin 1 of the sixth voltage transformer U6. The two ends of the eighteenth resistor R18 are electrically connected to pins 2 and 3 of the sixth voltage transformer U6, respectively. One end of the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 are electrically connected to pins 1, 3, 5, and 7 of the third AC voltage input terminal J3, respectively. The fifth resistor R5, the sixth resistor R6, the seventh resistor R7, and the eighth resistor R8 are electrically connected to pins 1, 3, 5, and 7 of the fourth AC voltage input terminal J4, respectively.

7. The dual-channel isolated AC voltage detection device according to claim 6, characterized in that, The processor U1 is model M430FE4232, the second terminal block J2 is model CON10J, and the second DIP switch S2 is a four-position DIP switch; pins 1, 3, 5, 7, and 10 of the second terminal block J2 are electrically connected to pins 54, 55, 56, 57, and 58 of the processor U1, respectively; pin 2 of the second terminal block J2 is connected to +3.3V; pin 9 of the second terminal block J2 is grounded. Pins 5-8 of the second DIP switch S2 are electrically connected to pins 45, 44, 46, and 47 of the processor U1, respectively; pins 1-4 of the second DIP switch S2 are connected to ground and then connected to one end of the first switch S1; the other end of the first switch S1 is electrically connected to pin 48 of the processor U1. One end of the first capacitor C1 is grounded, and the other end is electrically connected to pin 10 of the processor U1; the two ends of the quartz crystal resonator Y1 are connected to pins 8 and 9 of the processor U1, respectively.

8. The dual-channel isolated AC voltage detection device according to claim 7, characterized in that, Pin 1 of the first terminal J1 is connected to a +3.3V voltage; pin 2 of the first terminal J1 is electrically connected to pin 64 and pin 1 of the processor U1; pin 3 of the first terminal J1 is electrically connected to one end of the twenty-seventh resistor R27; the other end of the twenty-seventh resistor R27 is electrically connected to pin 58 of the processor U1 and one end of the seventh capacitor C7; the other end of the seventh capacitor C7 is grounded.

9. The dual-channel isolated AC voltage detection device according to claim 8, characterized in that, The eleventh communication chip U11 is model ADM2483; pins 1 and 2 of the eleventh communication chip U11 are electrically connected and then connected to +5V; pin 3 of the eleventh communication chip U11 is electrically connected to pin 59 of processor U1; pins 4 and 5 of the eleventh communication chip U11 are electrically connected and then connected to pin 61 of processor U1; pin 6 of the eleventh communication chip U11 is electrically connected to pin 60 of processor U1; pins 7 and 8 of the eleventh communication chip U11 are electrically connected and then grounded; pins 9 and 10 of the eleventh communication chip U11 are electrically connected and then grounded; pin 16 of the eleventh communication chip U11 is connected to +5V.

10. The dual-channel isolated AC voltage detection device according to claim 9, characterized in that, Multiple devices are connected in parallel via an RS485 bus. The address of each device is set via the second DIP switch S2, and the RS485 bus is terminated by a 120Ω matching resistor.

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