Wireless residual current detection module

Abstract

The utility model discloses a wireless residual current detection module, which belongs to the technical field of current detection and comprises a shell, and a power circuit module, a DC-DC conversion circuit module, a WiFi control circuit module, a CPU, a residual current measurement circuit module, an auxiliary contact circuit module and an RS485 communication interface circuit module are arranged in the shell. The power supply circuit module is electrically connected with the WiFi control circuit module and the CPU through the DC-DC conversion circuit module; according to the utility model, the DC-DC conversion circuit module, the WiFi control circuit module, the CPU, the residual current measurement circuit module, the auxiliary contact circuit module and the RS485 communication interface circuit module are arranged, so that the module can measure the residual current and detect the leakage current, and transmits the measured data to an Internet of Things control center through a WIFI, NB or RS485 signal line, and the module is convenient to use, high in reliability and high in reliability. And the module is provided with a pair of conversion dry contacts for realizing automation (for example, when the measured residual current exceeds a set value, the contact action controls the separation of the protection switch).

Description

Technical Field

[0001] The utility model belongs to the technical field of current detection, and in particular relates to a wireless residual current detection module. Background Art

[0002] Most of the current sensors currently available on the market are wired, and a small number can achieve wireless communication; but they all require complex wiring, such as power supply lines, communication lines, and detection lines. Therefore, a wireless residual current detection module is needed to solve the above problems. Utility Model Content

[0003] The purpose of the utility model is to provide a wireless residual current detection module to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a wireless residual current detection module, comprising a shell, in which a power supply circuit module, a DC-DC conversion circuit module, a WiFi control circuit module and a CPU, a residual current measurement circuit module, an auxiliary contact circuit module and an RS485 communication interface circuit module are arranged, the power supply circuit module is electrically connected to the WiFi control circuit module and the CPU through the DC-DC conversion circuit module, and the WiFi control circuit module and the CPU are electrically connected to the residual current measurement circuit module, the auxiliary contact circuit module and the RS485 communication interface circuit module respectively.

[0005] Wherein, the shell includes a shell, and two docking ports are provided on the back of the shell. The power supply circuit module, DC-DC conversion circuit module, WiFi control circuit module and CPU, residual current measurement circuit module, auxiliary contact circuit module and RS485 communication interface circuit module are all connected in the shell.

[0006] As a preferred embodiment, the power supply circuit module adopts a T1 chip, the T1 chip is an ACDC3W chip, the pin 1 of the ACDC3W is connected to D4, CX1, R22 and L1, the pin 2 of the ACDC3W is connected to SMBJ400CA, Line N0, CX1, R22 and L2, the values ​​of CX1 and R22 are set to 0.1uF / 275V and 1MΩ respectively, and the values ​​of L1 and L2 are both 2.7mH 101 (C36750), the L1 and L2 are both connected to RV1, the L1 is connected to TP4 and TP5, the L2 is connected to TP3 through F1, the TP3 and TP4 air plates are connected to Line_U and Line_N, the TP5 is grounded, the RV1, TP3 and TP5 are set to 10D471K, 20T-010H and DEBUGPAD respectively, the pin 3 of the ACDC3W is grounded, the pin 4 of the ACDC3W is connected to E2, C17, D5 and a 12V power supply, the E2, C17 and D5 are all grounded, and the values ​​of E2, C17 and D5 are set to 220uF / 16V, 100nF10%50V respectively.

[0007] As a preferred embodiment, the DC-DC conversion circuit module adopts U5 chip, the U5 chip is SY8120B1 chip, pins 1 and 6 of the SY8120B1 chip are connected to C15, the C15 is connected to L4, the L4 is connected to C16, R23, C18 and a 3.3V power supply, and the values ​​of C15, L4, C16, R23 and C18 are set to 100nF10%50V, 4.7uH1.8A, 22pH5%50V respectively. and 22uF20%6.3V, pin 2 of the SY8120B1 chip is grounded, pin 3 of the SY8120B1 chip is connected to C16, R23 and R24, the R24 is grounded, the value of R24 is set to 22.1KΩ±1%, pins 4 and 5 of the SY8120B1 chip are connected to C14 and C15, the C14 and C15 are grounded, the values ​​of C14 and C15 are set to 100nF10%50V and 4.7uF10%25V respectively.

[0008] As a preferred implementation, the WiFi control circuit and CPU use an M1 chip, a J1 chip, and a JP1 chip. The M1 chip and the J1 chip are respectively a C:BU IPEX chip and a WAFER-MX1.25-2PZZ chip. Pins 1, 2, and 20 of the C:BU IPEX chip are respectively connected to BL01_SCLK, BL01_MOSI, and BL01_MISO. Pins 3, 4, 6, 7, 11, 18, and 21 of the C:BU IPEX chip are all connected to the placeholder. Pin 5 of the IPEX chip is connected to R1 and pin 1 of the WAFER-MX1.25-2PZZ chip, pin 2 of the WAFER-MX1.25-2PZZ chip is grounded, R1 is connected to C1 and a 3.3V power supply respectively, C1 is grounded, the values ​​of R1 and C1 are set to 20KΩ(2002)±1% and 100nF10%50V respectively, pin 1, pin 2, pin 4 and pin 5 of the JP1 chip are grounded, pin 3 of the JP1 chip is connected to Relay_R / G, pin 6, pin 7 and pin 8 of the JP1 chip are connected to WiFi_LED_B, KeyIN and Key_LED_R / G respectively, pin 9 and pin 10 of the JP1 chip are connected to a 3.3V power supply, pin 8, pin 9 and pin 10 of the C:BU IPEX chip are connected to BL0942_CF1, BL0942_XC and BL0942_CF2 respectively, the C:BU Pin 12 of the IPEX chip is connected to R10, which is grounded, and the value of R10 is 100Ω(1000)±1%. Pin 13 of the C:BU IPEX chip is grounded, pin 14 of the C:BU IPEX chip is connected to E1, which is connected to a 3.3V power supply and C7, and both E1 and C7 are grounded. The values ​​of E1 and C7 are 1007uF / 10V and 100nF(104, 10%50V, respectively. Pins 15 and 16 of the C:BU IPEX chip are connected to R14 and R13, respectively, and R14 and R13 are connected to BL0942_Ex and BL0942Tx, respectively, and the values ​​of R14 and R13 are both 100Ω(1000)±1%. Pins 17 and 19 of the C:BU IPEX chip are connected to KeyIN and WiFi_LED_B, respectively.

[0009] As a preferred implementation, the residual current measurement circuit module adopts U1, U6, U7, U8 and U9 chips, wherein the U1 chip is an electrical detection chip, the U6, U7, U8 and U9 chips are all BL0939_20 chips, the pin 1 of the electrical detection chip is respectively connected to C4, C5 and 3.3V, the C4 and C5 are both connected to GND, the values ​​of C4 and C5 are respectively set to 2.2uF / 10V and 100nF10%50V, the pin 2 and pin 3 of the electrical detection chip are respectively connected to I12_P and I12_N, the I12_P is connected to R6 and C2, the I12_N is connected to R7 and C3, the C2 and C3 are both connected to GND, the R6 and R 7 are connected to R5 through I11_P and I11_N respectively, the I11_N is connected to TP1, the values ​​of C2 and C3 are set to 68nF10%50V, the values ​​of R6 and R7 are set to 510Ω±1% and 510Ω(1001)±1% respectively, the pin 4 of the electrical measurement detection chip is connected to R12 and C6 respectively, the C6 is connected to GND and R15 respectively, the R12 is connected to Line_NO through R9, R2, R11 and R8, the values ​​of C6 and R15 are set to 68nF10%50V and 510Ω(1001)±1% respectively, the values ​​of R12, R9, R2, R11 and R8 are set to 390KΩ(3903)±1%, the Pins 5, 6, 7, 11 and 12 of the electrical detection chip are connected to GND, pins 8, 9 and 10 of the electrical detection chip are connected to BL0942_CF2, BL0942_XC and BL0942_CF1 respectively, pins 13 and 14 of the electrical detection chip are connected to BL0942_Rx and BL0942__Tx respectively, pins 13 and 14 of the electrical detection chip are connected to R16 and R25 respectively, and R16 and R25 are connected to GND, and the values ​​of R16 and R25 are set to 10KΩ (1002) ± 1%, pin 1 of the U6 chip is connected to 3.3V through C24 and C26, and C24 and C26 are grounded, and pin 3 of the U6 chip is connected to 3.3V through C10 and R 30 is connected to JP2, pin 4 of the U6 chip is connected to JP3 through C11 and R31, C10 and C11 are both connected to GND, R30 and R31 are connected with the same R26, pin 5 of the U6 chip is connected to JP4 through C12 and R32, pin 6 of the U6 chip is connected to JP5 through C19 and R33, C12 and C19 are both connected to GND, R32 and R33 are connected with the same R27, the values ​​of C10, C11, C12 and C19 are all 33nF10%50V, the values ​​of R30, R31, R32 and R33 are all 1KΩ(1001)±1%, pin 1 of the U7 chip is connected to 3 through C25 and C27.3V connection, C25 and C27 are both connected to GND, pin 3 of the U7 chip is connected to JP6 through C20 and R34, pin 4 of the U7 chip is connected to JP7 through C21 and R35, C20 and C21 are both connected to GND, a same R28 is connected between R34 and R35, pin 5 of the U7 chip is connected to JP8 through C22 and R36, pin 6 of the U7 chip is connected to JP9 through C23 and R37, C22 and C23 are both connected to GND, a same R29 is connected between R36 and R37, the values ​​of C20, C21, C22 and C23 are all 33nF10%50V, R3 4. The values ​​of R35, R36 and R37 are all 1KΩ (1001) ± 1%. Pin 1 of the U8 chip is connected to 3.3V through C36 and C38, and C36 and C38 are both grounded. Pin 3 of the U8 chip is connected to JP10 through C28 and R40. Pin 4 of the U8 chip is connected to JP11 through C29 and R41. C28 and C29 are both connected to GND. The same R38 is connected between R40 and R41. Pin 5 of the U8 chip is connected to JP12 through C30 and R42. Pin 6 of the U8 chip is connected to JP13 through C31 and R43. C30 and C31 are both connected to GND. The same R39 is connected between C28, C29, C30 and C31, the values ​​of C28, C29, C30 and C31 are all 33nF10%50V, the values ​​of R40, R41, R42 and R43 are all 1KΩ(1001)±1%, the pin 1 of the U9 chip is connected to 3.3V through C37 and C39, the pins C37 and C39 are both grounded, the pin 3 of the U9 chip is connected to JP14 through C32 and R46, the pin 4 of the U9 chip is connected to JP15 through C33 and R47, the C32 and C33 are both connected to GND, the same R44 is connected between R46 and R47, the pin 5 of the U9 chip is connected to JP15 through C34 and R48 16, the pin 6 of the U9 chip is connected to JP17 through C35 and R49, the C32 and C33 are connected to GND, the same R45 is connected between R48 and R49, the values ​​of C32, C33, C34 and C35 are all 33nF10%50V, the values ​​of R46, R47, R48 and R49 are all 1KΩ(1001)±1%, the pins 2, 7, 13, 14, 15 and 20 of the U6, U7, U8 and U9 chips are all connected to the placeholder, the pins 8, 10 and 12 of the U6, U7, U8 and U9 chips are all connected to GND, the pins 9, 11 and 16 of the U6, U7, U8 and U9 chips are all connected to 2.2V connection, pins 17, 18 and 19 of the U6, U7, U8 and U9 chips are connected to BL01_SCLK, BL01_MOSI and BL01_MISO respectively. .

[0010] As a preferred implementation, the auxiliary contact circuit module adopts a JK1 chip and a Q1 transistor, the JK1 chip is a SRD-12VDC-SL-CD6 chip, pin 1 of the SRD-12VDC-SL-CD6 chip is connected to a 12V power supply and M7, pin 2 of the SRD-12VDC-SL-CD6 chip is connected to M7, pins 3, 4 and 5 of the SRD-12VDC-SL-CD6 chip are connected to COM, NO and NC respectively, pin 2 of the SRD-12VDC-SL-CD6 chip is connected to the Q1 transistor, the model of the Q1 transistor is SS8050, the Q1 transistor is connected to R4 and R3, the Q1 transistor is grounded, R3 is connected to Relay_OFFON, and the values ​​of R3 and R4 are both 100Ω(1000)±1%.

[0011] As a preferred implementation, the RS485 communication interface circuit module uses a VR1 chip, a U4 chip and a J1 chip, wherein the VR1 chip, the U4 chip and the J1 chip are respectively an AMS1117-3.3 chip, a MAX13487 chip and a KF2EDG-3P3.81 chip, the pin Vin of the AMS1117-3.3 chip is connected to C21, C20 and D+5V, the C21 and C20 are both grounded, the values ​​of the C21 and C20 are respectively 2.2uF20%50V and 10nF10%50V, the pin Vout of the AMS1117-3.3 chip is Connected to C22, C23 and D3.3V, C22 and C23 are both grounded, the values ​​of C22 and C23 are 10uF10%25V and 10nF10%50V respectively, the GND pin of the AMS1117-3.3 chip is grounded, pins 1 and 4 of the MAX13487 chip are connected to UART_Rx and UART_Tx respectively, pin 1 of the MAX13487 chip is connected to R24, pin 4 of the MAX13487 chip is connected to R25, R24 and R25 are both connected to D3.3V and C24, C24 is grounded, R24, R25 and C The values ​​of 24 are 10KΩ(1002)±1%, 10KΩ(1002)±1%, 100nF10%50 respectively, the pin 5 of the MAX13487 chip is grounded, the pins 6 and 7 of the MAX13487 chip are connected to RS485A_P and RS485A_N respectively, the pins 6 and 7 of the MAX13487 chip are connected to R27 and R26 respectively, the R27 and R26 are both grounded, the values ​​of R27 and R26 are both 10KΩ(1002)±1%, the pins 1 and 3 of the KF2EDG-3P3.81 chip are connected to RS485A_P and RS 485A_N is connected, RS485A_P and RS485A_N in the KF2EDG-3P3.81 chip are respectively connected to RS485A_P and RS485A_N in the MAX13487 chip, RS485A_P and RS485A_N in the KF2EDG-3P3.81 chip are respectively connected to D5 and D7, RS485A_P and RS485A_N in the KF2EDG-3P3.81 chip are respectively connected to D6, D5 is connected to D3.3, D7 is grounded, and D5, D6 and D7 are all P65MB6.8CA.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The utility model is provided with a power circuit module, a DC-DC conversion circuit module, a WiFi control circuit module and a CPU, a residual current measurement circuit module, an auxiliary contact circuit module and an RS485 communication interface circuit module. The module can measure the residual current, detect the leakage current, and transmit the measured data to the Internet of Things control center through a WIFI, NB or RS485 signal line. The module is easy to use and has a pair of conversion dry contacts for realizing automation (such as measuring that the residual current exceeds the set value, the contact action controls the separation of the protection switch). BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0015] Figure 2 It is a schematic diagram of the rear-view stereoscopic structure of the utility model;

[0016] Figure 3 It is a schematic diagram of the rear-view stereoscopic cross-sectional structure of the utility model;

[0017] Figure 4 It is a circuit diagram of the power circuit module of the utility model;

[0018] Figure 5 This is a circuit diagram of the DC-DC conversion circuit module of the utility model;

[0019] Figure 6 This is a circuit diagram of the WiFi control circuit module and the CPU of the utility model;

[0020] Figure 7 The circuit diagram of the residual current measurement circuit module of the utility model;

[0021] Figure 8 This is a circuit diagram of the auxiliary contact circuit module of the utility model;

[0022] Fig. 9 The circuit diagram of the RS485 communication interface circuit module of the utility model;

[0023] Fig.10 This is a circuit diagram of the drive circuit module of the utility model.

[0024] In the figure: 1. shell; 11. housing; 12. docking port; 2. power supply circuit module; 3. DC-DC conversion circuit module; 4. WiFi control circuit module and CPU; 5. residual current measurement circuit module; 6. auxiliary contact circuit module; 7. RS485 communication interface circuit module. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the embodiments.

[0026] The following examples are used to illustrate the present invention, but cannot be used to limit the scope of protection of the present invention. The conditions in the examples can be further adjusted according to specific conditions, and simple improvements to the method of the present invention under the premise of the concept of the present invention are all within the scope of protection claimed by the present invention.

[0027] See also Figure 1-10 The utility model provides a wireless residual current detection module, including a shell 1, in which a power circuit module 2, a DC-DC conversion circuit module 3, a WiFi control circuit module and a CPU 4, a residual current measurement circuit module 5, an auxiliary contact circuit module 6 and an RS485 communication interface circuit module 7 are arranged. The power circuit module 2 is electrically connected to the WiFi control circuit module and the CPU 4 through the DC-DC conversion circuit module 3, and the WiFi control circuit module and the CPU 4 are electrically connected to the residual current measurement circuit module 5, the auxiliary contact circuit module 6 and the RS485 communication interface circuit module 7 respectively.

[0028] The housing 1 includes a housing 11, and two docking ports 12 are provided on the back of the housing 11. The power circuit module 2, the DC-DC conversion circuit module 3, the WiFi control circuit module and the CPU 4, the residual current measurement circuit module 5, the auxiliary contact circuit module 6 and the RS485 communication interface circuit module 7 are all connected in the housing 11. By providing the docking port 12, the detection module can be spliced ​​with the GK5 switch through the two docking ports 12 provided on the back thereof, which is not only simple to operate, but also the detection module and the GK5 switch can cooperate with each other to complete leakage protection and leakage detection, and can realize local automatic control function;

[0029] The power circuit module 2 uses T1 chip, which is ACDC3W chip. Pin 1 of ACDC3W is connected to D4, CX1, R22 and L1. Pin 2 of ACDC3W is connected to SMBJ400CA, Line N0, CX1, R22 and L2. The values ​​of CX1 and R22 are set to 0.1uF / 275V and 1MΩ respectively. The values ​​of L1 and L2 are both 2.7mH. 101 (C36750), L1 and L2 are connected to RV1, L1 is connected to TP4 and TP5, L2 is connected to TP3 through F1, TP3 and TP4 wind plates are connected to Line_U and Line_N, TP5 is grounded, RV1, TP3 and TP5 are set to 10D471K, 20T-010H and DEBUGPAD respectively, pin 3 of ACDC3W is grounded, pin 4 of ACDC3W is connected to E2, C17, D5 and 12V power supply, E2, C17 and D5 are all grounded, the values ​​of E2, C17 and D5 are set to 220uF / 16V, 100nF10410%50V respectively, by setting the power supply circuit module 2, the main function of this circuit is to power the internal circuit of the wireless residual current detection module, it converts AC50-750V into DC12V;

[0030] The DC-DC conversion circuit module 3 uses the U5 chip, which is the SY8120B1 chip. Pins 1 and 6 of the SY8120B1 chip are connected to C15, which is connected to L4, which is connected to C16, R23, C18 and a 3.3V power supply. The values ​​of C15, L4, C16, R23 and C18 are set to 100nF10410%50V, 4.7uH1.8A, 22pH2205%50V and 22uF22620%6.3V respectively. Pin 2 of the SY8120B1 chip is grounded, which is the SY Pin 3 of the 8120B1 chip is connected to C16, R23 and R24, R24 is grounded, and the value of R24 is set to 22.1KΩ±1%. Pins 4 and 5 of the SY8120B1 chip are connected to C14 and C15, C14 and C15 are grounded, and the values ​​of C14 and C15 are set to 100nF10410%50V and 4.7uF47510%25V respectively. By setting the DC-DC conversion circuit module 3, the above 12V power supply is reduced to 3.3V for use by the WiFi circuit, the detection circuit, and the single-chip microcomputer control circuit;

[0031] The WiFi control circuit and CPU4 use M1 chip, J1 chip and JP1 chip. M1 chip and J1 chip are C:BUIPEX chip and WAFER-MX1.25-2PZZ chip respectively. Pin 1, pin 2 and pin 20 of C:BU IPEX chip are connected to BL01_SCLK, BL01_MOSI and BL01_MISO respectively. Pin 3, pin 4, pin 6, pin 7, pin 11, pin 18 and pin 21 of C:BU IPEX chip are all connected to placeholders. Pin 5 of IPEX chip is connected to R1 and pin 1 of WAFER-MX1.25-2PZZ chip, pin 2 of WAFER-MX1.25-2PZZ chip is grounded, R1 is connected to C1 and 3.3V power supply respectively, C1 is grounded, the values ​​of R1 and C1 are set to 20KΩ2002±1% and 100nF10410%50V respectively, pin 1, pin 2, pin 4 and pin 5 of JP1 chip are all grounded, pin 3 of JP1 chip is connected to Relay_R / G, pin 6, pin 7 and pin 8 of JP1 chip are respectively connected to WiFi_LED_B, KeyIN and Key_LED_R / G, pin 9 and pin 10 of JP1 chip are both connected to 3.3V power supply, C:BU pin 8, pin 9 and pin 10 of IPEX chip are respectively connected to BL0942_CF1, BL0942_XC and BL0942_CF2, C:BU Pin 12 of IPEX chip is connected to R10, R10 is grounded, and the value of R10 is 100Ω1000±1%. Pin 13 of C:BU IPEX chip is grounded. Pin 14 of C:BU IPEX chip is connected to E1, E1 is connected to 3.3V power supply and C7, E1 and C7 are both grounded, and the values ​​of E1 and C7 are 1007uF / 10V and 100nF(104,10%50V respectively. Pin 15 and pin 16 of C:BU IPEX chip are connected to R14 and R13 respectively, R14 and R13 are connected to BL0942_Ex and BL0942Tx respectively, and the values ​​of R14 and R13 are both 100Ω1000±1%. Pin 17 and pin 19 of C:BU IPEX chip are connected to KeyIN and WiFi_LED_B respectively. By setting WiFi control circuit module and CPU 4. The WiFi control circuit module and CPU are set as the main controller. The M1 module can complete data communication via WiFi or NB. The CPU of the WiFi module reads the data of the residual current detection chip and drives the relay by configuring the parameters.

[0032] The residual current measurement circuit module 5 adopts U1, U6, U7, U8 and U9 chips, U1 chip is an electric detection chip, U6, U7, U8 and U9 chips are all BL0939_20 chips, pin 1 of the electric detection chip is connected to C4, C5 and 3.3V respectively, C4 and C5 are connected to GND, the values ​​of C4 and C5 are set to 2.2uF / 10V and 100nF10410%50V respectively, pin 2 and pin 3 of the electric detection chip are connected to I12_P and I12_N respectively, I12_P is connected to R6 and C2, I12_N is connected to R7 and C3, C2 and C3 are connected to GND, R6 and R7 are connected to I11_ P and I11_N are connected to R5, I11_N is connected to TP1, the values ​​of C2 and C3 are set to 68nF68310%50V, the values ​​of R6 and R7 are set to 510Ω±1% and 510Ω1001±1% respectively, the pin 4 of the electrical detection chip is connected to R12 and C6 respectively, C6 is connected to GND and R15 respectively, and R12 is connected to Line_NO through R9, R2, R11 and R8, the values ​​of C6 and R15 are set to 68nF68310%50V and 510Ω1001±1% respectively, the values ​​of R12, R9, R2, R11 and R8 are set to 390KΩ3903±1%, the electrical detection chip Pins 5, 6, 7, 11 and 12 of the chip are connected to GND, pins 8, 9 and 10 of the electrical detection chip are connected to BL0942_CF2, BL0942_XC and BL0942_CF1 respectively, pins 13 and 14 of the electrical detection chip are connected to BL0942_Rx and BL0942__Tx respectively, pins 13 and 14 of the electrical detection chip are connected to R16 and R25 respectively, R16 and R25 are connected to GND, and the values ​​of R16 and R25 are set to 10KΩ1002±1%, pin 1 of the U6 chip is connected to 3.3V through C24 and C26, C24 and C26 are grounded, and pin 3 of the U6 chip is connected to 3.3V through C10 and R30 Connected to JP2, pin 4 of U6 chip is connected to JP3 through C11 and R31, C10 and C11 are connected to GND, R30 and R31 are connected with the same R26, pin 5 of U6 chip is connected to JP4 through C12 and R32, pin 6 of U6 chip is connected to JP5 through C19 and R33, C12 and C19 are connected to GND, R32 and R33 are connected with the same R27, the values ​​of C10, C11, C12 and C19 are all 33nF33310%50V, the values ​​of R30, R31, R32 and R33 are all 1KΩ1001±1%, pin 1 of U7 chip is connected to 3 through C25 and C27.3V connection, C25 and C27 are both connected to GND, pin 3 of U7 chip is connected to JP6 through C20 and R34, pin 4 of U7 chip is connected to JP7 through C21 and R35, C20 and C21 are both connected to GND, R34 and R35 are connected with the same R28, pin 5 of U7 chip is connected to JP8 through C22 and R36, pin 6 of U7 chip is connected to JP9 through C23 and R37, C22 and C23 are both connected to GND, R36 and R37 are connected with the same R29, the values ​​of C20, C21, C22 and C23 are all 33nF33310%50V, R34 The values ​​of R35, R36 and R37 are all 1KΩ1001±1%. Pin 1 of U8 chip is connected to 3.3V through C36 and C38, and both are grounded through C36 and C38. Pin 3 of U8 chip is connected to JP10 through C28 and R40. Pin 4 of U8 chip is connected to JP11 through C29 and R41. C28 and C29 are both connected to GND. The same R38 is connected between R40 and R41. Pin 5 of U8 chip is connected to JP12 through C30 and R42. Pin 6 of U8 chip is connected to JP13 through C31 and R43. C30 and C31 are both connected to GND. The same R39 is connected between them. The values ​​of C28, C29, C30 and C31 are all 33nF33310%50V. The values ​​of R40, R41, R42 and R43 are all 1KΩ1001±1%. Pin 1 of U9 chip is connected to 3.3V through C37 and C39, and grounded through C37 and C39. Pin 3 of U9 chip is connected to JP14 through C32 and R46. Pin 4 of U9 chip is connected to JP15 through C33 and R47. C32 and C33 are both connected to GND. The same R44 is connected between R46 and R47. Pin 5 of U9 chip is connected to JP16 through C34 and R48. , Pin 6 of U9 chip is connected to JP17 through C35 and R49, C32 and C33 are connected to GND, the same R45 is connected between R48 and R49, the values ​​of C32, C33, C34 and C35 are all 33nF33310%50V, the values ​​of R46, R47, R48 and R49 are all 1KΩ1001±1%, Pins 2, 7, 13, 14, 15 and 20 of U6, U7, U8 and U9 chips are all connected to placeholders, Pins 8, 10 and 12 of U6, U7, U8 and U9 chips are all connected to GND, Pins 9, 11 and 16 of U6, U7, U8 and U9 chips are all connected to 2.2V connection, pins 17, 18 and 19 of U6, U7, U8 and U9 chips are connected to BL01_SCLK, BL01_MOSI and BL01_MISO respectively. By setting the residual current measurement circuit module 5, this circuit directly measures the residual current through an external open-type transformer and sends it to the CPU. The chip completes sampling, filtering, signal amplification, data sorting, etc. The CPU inside the WiFi module reads the measurement data through the SPI data line. The U1 chip completes the power measurement inside the device, the voltage measurement of the AC power, the voltage zero point measurement, and the current zero point measurement. The U6, U7, U8, and U9 chips mainly measure the residual current, and each chip measures two channels. It can collect 8 channels of data;.

[0033] Auxiliary contact circuit module 6 adopts JK1 chip and Q1 transistor. JK1 chip is SRD-12VDC-SL-CD6 chip. Pin 1 of SRD-12VDC-SL-CD6 chip is connected to 12V power supply and M7. Pin 2 of SRD-12VDC-SL-CD6 chip is connected to M7. Pin 3, pin 4 and pin 5 of SRD-12VDC-SL-CD6 chip are connected to COM, NO and NC respectively. Pin 2 of SRD-12VDC-SL-CD6 chip is connected to Q1 transistor. Model of Q1 transistor is SS8050. Q1 transistor is connected to R4 and R3. Q1 transistor is grounded. R3 is connected to Relay_OFFON. The values ​​of R3 and R4 are both 100Ω1000±1%.

[0034] RS485 communication interface circuit module 9 uses VR1 chip, U4 chip and J1 chip. VR1 chip, U4 chip and J1 chip are AMS1117-3.3 chip, MAX13487 chip and KF2EDG-3P3.81 chip respectively. The pin Vin of AMS1117-3.3 chip is connected with C21, C20 and D+5V. C21 and C20 are both grounded. The values ​​of C21 and C20 are 2.2uF22520%50V and 10nF10310%50V respectively. The pin Vout of AMS1117-3.3 chip is connected with C22, C23 and D3. 3V connection, C22 and C23 are grounded, the values ​​of C22 and C23 are 10uF10610%25V and 10nF10310%50V respectively, the GND pin of AMS1117-3.3 chip is grounded, the pins 1 and 4 of MAX13487 chip are connected to UART_Rx and UART_Tx respectively, the pin 1 of MAX13487 chip is connected to R24, the pin 4 of MAX13487 chip is connected to R25, R24 and R25 are connected to D3.3V and C24, C24 is grounded, the values ​​of R24, R25 and C24 are 10KΩ1002±1 %、10KΩ1002±1%、100nF10410%50,pin 5 of MAX13487 chip is grounded,pin 6 and pin 7 of MAX13487 chip are connected to RS485A_P and RS485A_N respectively,pin 6 and pin 7 of MAX13487 chip are connected to R27 and R26 respectively,R27 and R26 are grounded,the values ​​of R27 and R26 are both 10KΩ1002±1%,pin 1 and pin 3 of KF2EDG-3P3.81 chip are connected to RS485A_P and RS485A_N respectively,R27 in KF2EDG-3P3.81 chip is connected to RS485A_P and RS485A_N respectively, S485A_P and RS485A_N are connected to RS485A_P and RS485A_N in MAX13487 chip respectively, RS485A_P and RS485A_N in KF2EDG-3P3.81 chip are connected to D5 and D7 respectively, RS485A_P and RS485A_N in KF2EDG-3P3.81 chip are connected to D6 respectively, D5 is connected to D3.3, D7 is grounded, D5, D6 and D7 are all P65MB6.8CA, and RS485 communication interface circuit module 8 is set for RS485 wired communication.

[0035] The working principle and use process of the utility model are as follows: when the detection module needs to be used, the power circuit module 2 supplies power to the detection module, and at the same time, the DC-DC conversion circuit module 3 connected thereto reduces the supplied 12V power supply to 3.3V for the WiFi control circuit and CPU 4. The detection module is connected to the Internet of Things platform through its internal WiFi control circuit and CPU 4, and the detection result is output to the host device connected to the outside through the RS485 communication interface circuit module 7.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wireless residual current detection module, comprising a housing (1), characterized in that: The housing (1) is provided with a power supply circuit module (2), a DC-DC conversion circuit module (3), a WiFi control circuit module and a CPU (4), a residual current measurement circuit module (5), an auxiliary contact circuit module (6) and an RS485 communication interface circuit module (7); the power supply circuit module (2) is electrically connected to the WiFi control circuit module and the CPU (4) via the DC-DC conversion circuit module (3); and the WiFi control circuit module and the CPU (4) are electrically connected to the residual current measurement circuit module (5), the auxiliary contact circuit module (6) and the RS485 communication interface circuit module (7) respectively; The housing (1) comprises a shell (11), the back of the shell (11) is provided with two docking ports (12), and the power supply circuit module (2), the DC-DC conversion circuit module (3), the WiFi control circuit module and the CPU (4), the residual current measurement circuit module (5), the auxiliary contact circuit module (6) and the RS485 communication interface circuit module (7) are all connected inside the shell (11).

2. A wireless residual current detection module according to claim 1, characterized in that: The power circuit module (2) uses a T1 chip, which is an ACDC3W chip. Pin 1 of the ACDC3W is connected to D4, CX1, R22 and L1. Pin 2 of the ACDC3W is connected to SMBJ400CA, Line N0, CX1, R22 and L2. The values ​​of CX1 and R22 are set to 0.1uF / 275V and 1MΩ respectively. The values ​​of L1 and L2 are both 2.7mH. 101(C36750), the L1 and L2 are both connected to RV1, the L1 is connected to TP4 and TP5, the L2 is connected to TP3 through F1, the TP3 and TP4 air plates are connected to Line_U and Line_N, the TP5 is grounded, the RV1, TP3 and TP5 are set to 10D471K, 20T-010H and DEBUGPAD respectively, the pin 3 of the ACDC3W is grounded, the pin 4 of the ACDC3W is connected to E2, C17, D5 and a 12V power supply, the E2, C17 and D5 are all grounded, and the values ​​of E2, C17 and D5 are set to 220uF / 16V, 100nF(104)10%50V respectively.

3. A wireless residual current detection module according to claim 1, characterized in that: The DC-DC conversion circuit module (3) uses a U5 chip, which is a SY8120B1 chip. Pins 1 and 6 of the SY8120B1 chip are connected to C15, which is connected to L4, which is connected to C16, R23, C18 and a 3.3V power supply. The values ​​of C15, L4, C16, R23 and C18 are set to 100nF (104) 10% 50V, 4.7uH 1.8A, 22pH (220) 5% 50V and 22uF (2 26)20%6.3V, pin 2 of the SY8120B1 chip is grounded, pin 3 of the SY8120B1 chip is connected to C16, R23 and R24, R24 is grounded, the value of R24 is set to 22.1KΩ±1%, pins 4 and 5 of the SY8120B1 chip are connected to C14 and C15, C14 and C15 are grounded, the values ​​of C14 and C15 are set to 100nF (104) 10% 50V and 4.7uF (475) 10% 25V respectively.

4. A wireless residual current detection module according to claim 1, characterized in that: The WiFi control circuit and CPU (4) use an M1 chip, a J1 chip and a JP1 chip. The M1 chip and the J1 chip are respectively a C:BU IPEX chip and a WAFER-MX1.25-2PZZ chip. Pins 1, 2 and 20 of the C:BU IPEX chip are respectively connected to BL01_SCLK, BL01_MOSI and BL01_MISO. Pins 3, 4, 6, 7, 11, 18 and 21 of the C:BU IPEX chip are all connected to a placeholder. Pin 5 of the IPEX chip is connected to R1 and pin 1 of the WAFER-MX1.25-2PZZ chip, pin 2 of the WAFER-MX1.25-2PZZ chip is grounded, R1 is connected to C1 and a 3.3V power supply respectively, C1 is grounded, the values ​​of R1 and C1 are set to 20KΩ(2002)±1% and 100nF(104)10%50V respectively, pin 1, pin 2, pin 4 and pin 5 of the JP1 chip are all grounded, pin 3 of the JP1 chip is connected to Relay_R / G, pin 6, pin 7 and pin 8 of the JP1 chip are respectively connected to WiFi_LED_B, KeyIN and Key_LED_R / G, pin 9 and pin 10 of the JP1 chip are both connected to a 3.3V power supply, and C:BU Pin 8, pin 9 and pin 10 of the IPEX chip are connected to BL0942_CF1, BL0942_XC and BL0942_CF2 respectively, pin 12 of the C:BU IPEX chip is connected to R10, and the R10 is grounded. The value of R10 is 100Ω(1000)±1%, pin 13 of the C:BU IPEX chip is grounded, pin 14 of the C:BU IPEX chip is connected to E1, and the E1 is connected to a 3.3V power supply and C7. Both E1 and C7 are grounded. The values ​​of E1 and C7 are 1007uF / 10V and 100nF(104,10%50V, respectively. Pins 15 and 16 of the IPEX chip are connected to R14 and R13 respectively, and R14 and R13 are connected to BL0942_Ex and BL0942Tx respectively. The values ​​of R14 and R13 are both 100Ω(1000)±1%, and pins 17 and 19 of the C:BU IPEX chip are connected to KeyIN and WiFi_LED_B respectively.

5. A wireless residual current detection module according to claim 1, characterized in that: The residual current measurement circuit module (5) adopts U1, U6, U7, U8 and U9 chips, wherein the U1 chip is an electric detection chip, the U6, U7, U8 and U9 chips are all BL0939_20 chips, the pin 1 of the electric detection chip is respectively connected to C4, C5 and 3.3V, the C4 and C5 are both connected to GND, the values ​​of C4 and C5 are respectively set to 2.2uF / 10V and 100nF(104)10%50V, the pin 2 and pin 3 of the electric detection chip are respectively connected to I1 2_P and I12_N are connected, the I12_P is connected to R6 and C2, the I12_N is connected to R7 and C3, the C2 and C3 are both connected to GND, the R6 and R7 are connected to R5 through I11_P and I11_N respectively, the I11_N is connected to TP1, the values ​​of C2 and C3 are both set to 68nF (683) 10% 50V, the values ​​of R6 and R7 are respectively set to 510Ω ± 1% and 510Ω (1001) ± 1%, the pin 4 of the electrical detection chip is respectively Connected to R12 and C6, C6 is connected to GND and R15 respectively, R12 is connected to Line_NO through R9, R2, R11 and R8, the values ​​of C6 and R15 are set to 68nF (683) 10% 50V and 510Ω (1001) ±1% respectively, the values ​​of R12, R9, R2, R11 and R8 are all set to 390KΩ (3903) ±1%, the pins 5, 6, 7, 11 and 12 of the electrical detection chip are all connected to GND, the electrical detection chip Pins 8, 9 and 10 of the chip are connected to BL0942_CF2, BL0942_XC and BL0942_CF1 respectively, pins 13 and 14 of the electrical detection chip are connected to BL0942_Rx and BL0942__Tx respectively, pins 13 and 14 of the electrical detection chip are connected to R16 and R25 respectively, both R16 and R25 are connected to GND, and the values ​​of R16 and R25 are set to 10KΩ (1002) ± 1%, and pin 1 of the U6 chip is connected to 3 through C24 and C26.3V connection, C24 and C26 are both grounded, pin 3 of the U6 chip is connected to JP2 through C10 and R30, pin 4 of the U6 chip is connected to JP3 through C11 and R31, C10 and C11 are both connected to GND, a same R26 is connected between R30 and R31, pin 5 of the U6 chip is connected to JP4 through C12 and R32, pin 6 of the U6 chip is connected to JP5 through C19 and R33, C12 and C19 are both connected to GND, a same R27 is connected between R32 and R33, and the values ​​of C10, C11, C12 and C19 are all 33 nF (333) 10% 50V, the values ​​of R30, R31, R32 and R33 are all 1KΩ (1001) ± 1%, the pin 1 of the U7 chip is connected to 3.3V through C25 and C27, and the C25 and C27 are both connected to GND, the pin 3 of the U7 chip is connected to JP6 through C20 and R34, the pin 4 of the U7 chip is connected to JP7 through C21 and R35, and the C20 and C21 are both connected to GND, the same R28 is connected between R34 and R35, the pin 5 of the U7 chip is connected to JP8 through C22 and R36, and the pin 6 of the U7 chip is connected to JP8 through C2 3 and R37 are connected to JP9, C22 and C23 are both connected to GND, R36 and R37 are connected with the same R29, C20, C21, C22 and C23 are all 33nF (333) 10% 50V, R34, R35, R36 and R37 are all 1KΩ (1001) ± 1%, pin 1 of the U8 chip is connected to 3.3V through C36 and C38, C36 and C38 are both grounded, pin 3 of the U8 chip is connected to JP10 through C28 and R40, pin 4 of the U8 chip is connected to JP11 through C29 and R41, C C28 and C29 are connected to GND, the same R38 is connected between R40 and R41, the pin 5 of the U8 chip is connected to JP12 through C30 and R42, the pin 6 of the U8 chip is connected to JP13 through C31 and R43, the C30 and C31 are connected to GND, the same R39 is connected between R42 and R43, the values ​​of C28, C29, C30 and C31 are all 33nF (333) 10% 50V, the values ​​of R40, R41, R42 and R43 are all 1KΩ (1001) ±1%, the pin 1 of the U9 chip is connected to 3 through C37 and C39.3V connection, the C37 and C39 are both grounded, the pin 3 of the U9 chip is connected to JP14 through C32 and R46, the pin 4 of the U9 chip is connected to JP15 through C33 and R47, the C32 and C33 are both connected to GND, the same R44 is connected between R46 and R47, the pin 5 of the U9 chip is connected to JP16 through C34 and R48, the pin 6 of the U9 chip is connected to JP17 through C35 and R49, the C32 and C33 are both connected to GND, the same R45 is connected between R48 and R49, the C32, C33, C34 and C35 The values ​​are all 33nF (333) 10% 50V, the values ​​of R46, R47, R48 and R49 are all 1KΩ (1001) ±1%, the pins 2, 7, 13, 14, 15 and 20 of the U6, U7, U8 and U9 chips are all connected to the placeholder, the pins 8, 10 and 12 of the U6, U7, U8 and U9 chips are all connected to GND, the pins 9, 11 and 16 of the U6, U7, U8 and U9 chips are all connected to 2.2V, and the pins 17, 18 and 19 of the U6, U7, U8 and U9 chips are connected to BL01_SCLK, BL01_MOSI and BL01_MISO respectively. .

6. A wireless residual current detection module according to claim 1, characterized in that: The auxiliary contact circuit module (6) adopts a JK1 chip and a Q1 transistor. The JK1 chip is a SRD-12VDC-SL-CD6 chip. Pin 1 of the SRD-12VDC-SL-CD6 chip is connected to a 12V power supply and M7. Pin 2 of the SRD-12VDC-SL-CD6 chip is connected to M7. Pins 3, 4 and 5 of the SRD-12VDC-SL-CD6 chip are connected to COM, NO and NC respectively. Pin 2 of the SRD-12VDC-SL-CD6 chip is connected to the Q1 transistor. The model of the Q1 transistor is SS8050. The Q1 transistor is connected to R4 and R3. The Q1 transistor is grounded. R3 is connected to Relay_OFFON. The values ​​of R3 and R4 are both 100Ω(1000)±1%.

7. A wireless residual current detection module according to claim 1, characterized in that: The RS485 communication interface circuit module (9) uses a VR1 chip, a U4 chip and a J1 chip. The VR1 chip, the U4 chip and the J1 chip are respectively an AMS1117-3.3 chip, a MAX13487 chip and a KF2EDG-3P3.81 chip. The pin Vin of the AMS1117-3.3 chip is connected to C21, C20 and D+5V. The C21 and C20 are both grounded. The values ​​of C21 and C20 are respectively 2.2uF (225) 20% 50V and 10nF (103) 10% 50V. The pin Vout of the AMS1117-3.3 chip is connected to C2 2. C23 is connected to D3.3V, C22 and C23 are both grounded, the values ​​of C22 and C23 are 10uF (106) 10% 25V and 10nF (103) 10% 50V respectively, the GND pin of the AMS1117-3.3 chip is grounded, the pins 1 and 4 of the MAX13487 chip are connected to UART_Rx and UART_Tx respectively, the pin 1 of the MAX13487 chip is connected to R24, the pin 4 of the MAX13487 chip is connected to R25, the R24 and R25 are both connected to D3.3V and C24, the C24 is grounded, the R24, R2 The values ​​of C5 and C24 are 10KΩ(1002)±1%, 10KΩ(1002)±1%, 100nF(104)10%50 respectively, the pin 5 of the MAX13487 chip is grounded, the pins 6 and 7 of the MAX13487 chip are connected to RS485A_P and RS485A_N respectively, the pins 6 and 7 of the MAX13487 chip are connected to R27 and R26 respectively, the R27 and R26 are both grounded, the values ​​of R27 and R26 are both 10KΩ(1002)±1%, the pins 1 and 3 of the KF2EDG-3P3.81 chip are connected to RS485A_ P and RS485A_N are connected, the RS485A_P and RS485A_N in the KF2EDG-3P3.81 chip are respectively connected to the RS485A_P and RS485A_N in the MAX13487 chip, the RS485A_P and RS485A_N in the KF2EDG-3P3.81 chip are respectively connected to D5 and D7, the RS485A_P and RS485A_N in the KF2EDG-3P3.81 chip are respectively connected to D6, the D5 is connected to D3.3, the D7 is grounded, and the D5, D6 and D7 are all P65MB6.8CA.

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