A switching power supply detection device and system

Abstract

The utility model relates to a kind of switching power supply detection device and system, its device includes: shell and circuit board being set in shell, main control chip, alternating current measurement circuit and multichannel direct current acquisition circuit are arranged on circuit board;Alternating current measurement circuit includes current transformer, voltage transformer, the electric energy metering chip connected with current transformer and voltage transformer by high-speed switch diode array, and electric energy metering chip is connected with main control chip;Multichannel direct current acquisition circuit includes at least 2 direct current acquisition channels, each direct current acquisition channel includes current hall sensor chip, the differential isolation chip connected with direct current port by voltage dividing resistor group, and operational amplifier chip connected with differential isolation chip, and current hall sensor chip and operational amplifier chip are connected with main control chip.The utility model solves the technical problem that traditional detection device cannot synchronously detect alternating current input and multichannel direct current output parameter, and there is signal interference and low integration.

Description

Technical Field

[0001] This utility model relates to the field of switching power supply testing technology, and in particular to a switching power supply testing device and system. Background Technology

[0002] As the core power supply unit of modern electronic equipment, the performance stability of switching power supplies directly affects the equipment's lifespan and safety. Traditional testing methods often use discrete instruments (such as oscilloscopes and multimeters) to measure single parameters of AC input or DC output, but these methods have the following technical limitations:

[0003] Low integration: Multiple devices need to work together, which is complicated to operate and takes up a lot of space. It cannot achieve synchronous high-precision acquisition of AC / DC parameters.

[0004] Severe channel interference: When performing multi-channel DC detection, the lack of isolation measures between channels leads to signal crosstalk and measurement errors.

[0005] Therefore, those skilled in the art urgently need a switching power supply testing device that is superior to traditional solutions in terms of integration, measurement accuracy, and anti-interference capability. Utility Model Content

[0006] (a) Technical problems to be solved

[0007] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a switching power supply detection device and system, which aims to solve the problems of traditional switching power supply detection devices being unable to simultaneously detect AC input and multiple DC output parameters, and having signal interference and low integration.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0010] In a first aspect, this utility model provides a switching power supply detection device, including: a housing and a circuit board disposed inside the housing, wherein a main control chip, an AC metering circuit connected to the main control chip, and a multi-channel DC acquisition circuit are disposed on the circuit board.

[0011] The AC metering circuit includes a current transformer and a voltage transformer connected to an AC port on the housing, and an energy metering chip connected to the current transformer and the voltage transformer via a high-speed switching diode array. The energy metering chip is connected to the main control chip.

[0012] The multi-channel DC acquisition circuit includes at least two DC acquisition channels. Each DC acquisition channel includes a current Hall sensor chip connected to a DC port on the housing, a differential isolation chip connected to the DC port through an independent voltage divider resistor group, and an operational amplifier chip connected to the differential isolation chip. Both the current Hall sensor chip and the operational amplifier chip are connected to the main control chip.

[0013] Optionally, a bidirectional level conversion circuit is provided between the power metering chip and the main control chip;

[0014] The bidirectional level conversion circuit includes: a first MOSFET, a second MOSFET, a 5V power supply terminal, a 3.3V power supply terminal, a fifty-third resistor, a fifty-seventh resistor, a fifty-eighth resistor, a sixty-seventh resistor, a seventieth resistor, and a seventy-first resistor;

[0015] The source of the first MOSFET is connected to the signal output terminal of the power metering chip and the second terminal of the 57th resistor, the gate of the first MOSFET is connected to the second terminal of the 53rd resistor, the drain of the first MOSFET is connected to the second terminal of the 58th resistor and the signal input terminal of the main control chip, the 5V power supply terminal is connected to the first terminal of the 57th resistor and the first terminal of the 53rd resistor, and the 3.3V power supply terminal is connected to the first terminal of the 58th resistor.

[0016] The source of the second MOSFET is connected to the second terminal of the seventy-first resistor and the signal output terminal of the main control chip, the gate of the second MOSFET is connected to the second terminal of the sixty-seventh resistor, the drain of the second MOSFET is connected to the signal input terminal of the power metering chip and the second terminal of the seventieth resistor, the 5V power supply terminal is connected to the first terminal of the seventieth resistor and the first terminal of the sixty-seventh resistor, and the 3.3V power supply terminal is connected to the first terminal of the seventy-first resistor.

[0017] Optionally, the voltage divider resistor group includes a varistor, a thirty-first resistor, a thirty-second resistor, a thirty-third resistor, a thirty-fourth resistor, a thirty-fifth resistor, and a transient voltage suppressor diode;

[0018] The first end of the varistor is connected to the negative input terminal of the DC port, and the second end of the varistor is connected to the first end of the thirty-first resistor and the positive input terminal of the DC port, respectively. The thirty-first, thirty-second, thirty-third, thirty-fourth and thirty-fifth resistors are connected in series. The second end of the thirty-fifth resistor is connected to the first end of the transient voltage suppressor diode. The second end of the transient voltage suppressor diode is connected to the second end of the thirty-fourth resistor, the first end of the thirty-fifth resistor and the input terminal of the differential isolation chip, respectively.

[0019] Optionally, the multi-channel DC acquisition circuit may also include: an operating voltage isolation circuit;

[0020] The working voltage isolation circuit includes: an isolation power supply chip, a voltage reference chip, capacitors numbered twenty-first, twenty-second, twenty-third, twenty-fourth, and thirty-fourth, resistors numbered twentieth, twenty-second, and twenty-fifth, and a 5V power supply terminal;

[0021] The input terminal of the isolation power supply chip is connected to the first terminal of the twenty-first capacitor, the first terminal of the twenty-second capacitor, and the 5V power supply terminal, respectively. The input ground terminal of the isolation power supply chip is connected to the second terminal of the twenty-first capacitor and the second terminal of the twenty-second capacitor, respectively. The output terminal of the isolation power supply chip is connected to the first terminal of the twenty-third capacitor, the first terminal of the twenty-fourth capacitor, and the first terminal of the twentieth resistor, respectively. The output ground terminal of the isolation power supply chip is connected to the second terminal of the twenty-third capacitor and the second terminal of the twenty-fourth capacitor, respectively. The second terminal of the twentieth resistor is connected to the cathode of the voltage reference chip, the first terminal of the twenty-second resistor, the first terminal of the thirty-fourth capacitor, and the power input terminal of the differential isolation chip, respectively. The reference terminal of the voltage reference chip is connected to the second terminal of the twenty-second resistor and the first terminal of the twenty-fifth resistor, respectively. The anode of the voltage reference chip is connected to the second terminal of the twenty-fifth resistor and the second terminal of the thirty-fourth capacitor, respectively.

[0022] Optionally, the housing is also provided with an Ethernet interface and an RS485 interface for communication;

[0023] The Ethernet interface is an RJ45 type interface, which supports Modbus TCP / IP protocol;

[0024] The RS485 interface uses industrial-grade terminal blocks, supports the Modbus RTU protocol, and has built-in signal isolation protection circuitry.

[0025] Optionally, the signal isolation protection circuit includes: a resettable fuse, a signal isolation chip, and a single-channel inverter chip;

[0026] Two self-resetting fuses are configured, both used to connect the RS485 interface to the A / B bus access terminal of the signal isolation chip;

[0027] The output of the signal isolation chip is connected to the main control chip;

[0028] The input terminal of the single-channel inverter chip is connected to the main control chip, and the output terminal of the single-channel inverter chip is connected to the enable terminal of the signal isolation chip.

[0029] Optionally, the outer side of the housing is also equipped with a display screen and physical buttons connected to the main control chip;

[0030] The display screen is a semi-reflective LCD screen;

[0031] The joint between the physical buttons and the housing is filled with a silicone sealing ring.

[0032] Optionally, a supercapacitor is also provided on the circuit board. The supercapacitor is connected in parallel with the main power supply on the circuit board. When the main power supply fails, the supercapacitor is used to provide backup power for the switching power supply detection device and maintain the device's continuous operation for at least 3 minutes.

[0033] Optionally, a temperature and humidity sensor is also provided on the circuit board. The temperature and humidity sensor is connected to the main control chip and is used to monitor the temperature and humidity of the environment where the switching power supply detection device is located.

[0034] Secondly, embodiments of this utility model provide a switching power supply detection system, comprising:

[0035] At least one of the above-mentioned switching power supply detection devices;

[0036] A central monitoring platform that communicates with the switching power supply detection device.

[0037] (III) Beneficial Effects

[0038] The beneficial effects of this utility model are as follows: This application discloses a switching power supply detection device. The AC metering circuit in the device uses a current / voltage transformer and a high-speed switching diode array in conjunction with an energy metering chip to achieve high-precision sampling of AC parameters over a wide range, while reducing the number of discrete components. Furthermore, the multiple DC acquisition channels in the device utilize independent voltage divider resistor groups, differential isolation chips, and operational amplifier chips to achieve isolated amplification of multi-channel DC signals, avoiding crosstalk between channels and improving the signal-to-noise ratio. Attached Figure Description

[0039] Figure 1 This is a detection topology diagram of a switching power supply detection device according to an embodiment of the present invention;

[0040] Figure 2 This is a circuit diagram of a current transformer configuration according to an embodiment of the present invention;

[0041] Figure 3 This is a circuit diagram of a voltage transformer configuration according to an embodiment of the present invention;

[0042] Figure 4 This is a diagram of a bidirectional level conversion circuit according to an embodiment of the present invention;

[0043] Figure 5 This is a circuit diagram showing the configuration of an energy metering chip according to an embodiment of the present invention.

[0044] Figure 6 This is a circuit diagram showing the configuration of a current Hall sensor chip according to an embodiment of the present invention.

[0045] Figure 7This is a circuit diagram of a voltage divider resistor group proposed in an embodiment of the present invention;

[0046] Figure 8 This is a working voltage isolation circuit diagram proposed in one embodiment of the present invention;

[0047] Figure 9 This is a circuit diagram showing the configuration of a differential isolation chip according to an embodiment of the present invention;

[0048] Figure 10 This is a circuit diagram showing the configuration of an operational amplifier chip according to an embodiment of the present invention;

[0049] Figure 11 This is a circuit diagram of a signal isolation and protection circuit proposed in an embodiment of the present invention;

[0050] Figure 12 This is a front view of a switching power supply detection device according to an embodiment of the present invention.

[0051] Figure 13 This is a side view of a switching power supply detection device according to an embodiment of the present invention.

[0052] [Explanation of Labels in the Attached Image]

[0053] 1: Display screen; 2: Physical buttons; 3: DC power output 1; 4: DC power output 2; 5: AC power input; 6: AC power output; 7: DC power input 1; 8: DC power input 2; 9: Ethernet interface. Detailed Implementation

[0054] To better explain and facilitate understanding of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0055] refer to Figures 1 to 13 As shown in the figure, a switching power supply detection device proposed in this embodiment of the present invention includes: a housing and a circuit board disposed inside the housing. The circuit board is provided with a main control chip, an AC metering circuit connected to the main control chip, and a multi-channel DC acquisition circuit. The AC metering circuit includes a current transformer and a voltage transformer connected to an AC port disposed on the housing, and an energy metering chip connected to the current transformer and the voltage transformer through a high-speed switching diode array. The energy metering chip is connected to the main control chip. The multi-channel DC acquisition circuit includes at least two DC acquisition channels. Each DC acquisition channel includes a current Hall sensor chip connected to a DC port disposed on the housing, a differential isolation chip connected to the DC port through an independent voltage divider resistor group, and an operational amplifier chip connected to the differential isolation chip. The current Hall sensor chip and the operational amplifier chip are both connected to the main control chip.

[0056] The AC metering circuit in this embodiment uses a current / voltage transformer and a high-speed switching diode array in conjunction with an energy metering chip to achieve high-precision sampling of AC parameters over a wide range, while reducing the number of discrete components. Furthermore, the multi-channel DC acquisition system in this embodiment utilizes independent voltage divider resistor groups, differential isolation chips, and operational amplifier chips to achieve isolated amplification of multi-channel DC signals, avoiding crosstalk between channels and improving the signal-to-noise ratio.

[0057] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0058] Specifically, refer to Figure 1 As shown in the figure, this embodiment proposes a switching power supply detection device, which includes: a housing and a circuit board disposed inside the housing. The circuit board is provided with a main control chip (MCU), an AC metering circuit connected to the main control chip, and a multi-channel DC acquisition circuit.

[0059] In this embodiment, reference Figures 2 to 5 As shown, the AC metering circuit includes a current transformer and a voltage transformer connected to AC ports mounted on the housing, and an energy metering chip connected to the current transformer and voltage transformer via a high-speed switching diode array. The energy metering chip is connected to the main control chip. This embodiment achieves high-precision sampling of AC parameters over a wide range by using current / voltage transformers, a high-speed switching diode array, and an energy metering chip. Simultaneously, the high-speed switching diode array further reduces the number of discrete components.

[0060] Further, refer to Figure 2As shown, the current transformer CT1 and the power metering chip U9 are connected by the following resistors: the fifty-second resistor R52, the fifty-fifth resistor R55, the sixty-first resistor R61, the sixty-third resistor R63, the fifty-seventh capacitor C57, the sixty-third capacitor C63, and the tenth high-speed switching diode array ESD10. The first terminal of current transformer CT1 is connected to the second terminal of the sixty-first resistor R61 and the first terminal of the sixty-third resistor R63. The first terminal of the sixty-first resistor R61 is connected to the second terminal of the fifty-fifth resistor R55, the second terminal of the fifty-seventh capacitor C57, and the first terminal of the sixty-third capacitor C63. The second terminal of the sixty-third resistor R63 is connected to the second terminal of the sixty-third capacitor C63, the positive input terminal of the current differential signal of the energy metering chip U9, and the fourth and fifth terminals of the tenth high-speed switching diode array ESD10. The second terminal of current transformer CT1 is connected to the first terminal of the fifty-second resistor R52 and the first terminal of the fifty-fifth resistor R55. The second terminal of the fifty-second resistor R52 is connected to the first terminal of the fifty-seventh capacitor C57, the negative input terminal of the current differential signal of the energy metering chip U9, and the first and second terminals of the tenth high-speed switching diode array ESD10.

[0061] Further, refer to Figure 3 As shown, resistors R46, R47, and R48 are connected in series between the neutral input terminal of the AC port and the voltage transformer PT1.

[0062] Further, refer to Figure 3 As shown, a forty-ninth resistor R49, a fiftieth resistor R50, a forty-sixth capacitor C46, ​​a forty-seventh capacitor C47, and a ninth high-speed switching diode array ESD9 are configured between the voltage transformer PT1 and the energy metering chip U9. The third terminal of the voltage transformer PT1 is connected to the second terminal of the fiftieth resistor R50, the second terminal of the forty-sixth capacitor C46, ​​the second terminal of the forty-seventh capacitor C47, and the fourth and fifth terminals of the ninth high-speed switching diode array ESD9, respectively. The fourth terminal of the voltage transformer PT1 is connected to the first terminal of the fiftieth resistor R50, the first terminal of the forty-sixth capacitor C46, ​​and the first terminal of the forty-ninth resistor R49, respectively. The second terminal of the forty-ninth resistor R49 is connected to the first terminal of the forty-seventh capacitor C47, the positive voltage signal input terminal of the energy metering chip U9, and the first and second terminals of the ninth high-speed switching diode array ESD9, respectively.

[0063] Further, refer to Figure 4As shown, a bidirectional level conversion circuit is provided between the power metering chip U9 and the main control chip. The bidirectional level conversion circuit includes: a first MOSFET Q1, a second MOSFET Q2, a 5V power supply terminal, a 3.3V power supply terminal, a fifty-third resistor R53, a fifty-seventh resistor R57, a fifty-eighth resistor R58, a sixty-seventh resistor R67, a seventieth resistor R70, and a seventy-first resistor R71. The source of the first MOSFET Q1 is connected to the signal output terminal of the energy metering chip U9 and the second terminal of the 57th resistor R57. The gate of the first MOSFET Q1 is connected to the second terminal of the 53rd resistor R53. The drain of the first MOSFET Q1 is connected to the second terminal of the 58th resistor R58 and the signal input terminal of the main control chip. The 5V power supply terminal is connected to the first terminal of the 57th resistor R57 and the first terminal of the 53rd resistor R53. The 3.3V power supply terminal is connected to the first terminal of the 58th resistor R58. The source of the second MOSFET Q2 is connected to the second terminal of the 71st resistor R71 and the signal output terminal of the main control chip. The gate of the second MOSFET Q2 is connected to the second terminal of the 67th resistor R67. The drain of the second MOSFET Q2 is connected to the signal input terminal of the energy metering chip U9 and the second terminal of the 70th resistor R70. The 5V power supply terminal is connected to the first terminal of the 70th resistor R70 and the first terminal of the 67th resistor R67. The 3.3V power supply terminal is connected to the first terminal of the 71st resistor R71.

[0064] Further, refer to Figure 5 As shown, the configuration circuit of the power metering chip U9 also includes: the sixty-eighth capacitor C68, the sixty-ninth capacitor C69, the seventieth capacitor C70, the sixty-eighth resistor R68, the sixty-ninth resistor R69, and the eleventh ferrite bead L11. The power input terminal of the power metering chip U9 is connected to the second terminal of the eleventh ferrite bead L11 and the first terminal of the seventieth capacitor C70. The first terminal of the eleventh ferrite bead L11 is connected to the 5V power supply terminal, the first terminal of the sixty-eighth capacitor C68, and the first terminal of the sixty-ninth capacitor C69. The second terminal of the seventieth capacitor C70 is connected to the second terminals of the sixty-eighth capacitor C68 and the sixty-ninth capacitor C69. The signal output terminal of the power metering chip U9 is connected to the first terminal of the sixty-eighth resistor R68. The second terminal of the sixty-eighth resistor R68 is connected to the second terminal of the seventieth resistor R70 and the drain of the second MOSFET Q2. The signal output terminal of the power metering chip U9 is connected to the first terminal of the sixty-ninth resistor R69. The second terminal of the sixty-ninth resistor R69 is connected to the second terminal of the fifty-seventh resistor R57 and the source of the first MOSFET Q1.

[0065] In this embodiment, refer to as 6 to Figure 10As shown, the multi-channel DC acquisition circuit is configured with two DC acquisition channels. All DC acquisition channels have identical circuit configurations. Each DC acquisition channel includes a current Hall sensor chip connected to a DC port mounted on the housing, a differential isolation chip connected to the DC port via an independent voltage divider resistor group, and an operational amplifier chip connected to the differential isolation chip. Both the current Hall sensor chip and the operational amplifier chip are connected to the main control chip. This embodiment achieves isolation and amplification of multi-channel DC signals through the combination of independent voltage divider resistor groups, differential isolation chips, and operational amplifier chips, avoiding crosstalk between channels and improving the signal-to-noise ratio.

[0066] Further, refer to Figure 6 As shown, the configuration circuits of the two current Hall sensor chips (U2\U4) are identical, including: a first capacitor C1, an eleventh capacitor C11, a thirteenth capacitor C13, and a fourteenth capacitor C14. The first terminal of the first capacitor C1 is connected to the 3.3V power supply terminal and the power input terminal of the first current Hall sensor chip U2. The first terminal of the thirteenth capacitor C13 is connected to the 3.3V power supply terminal and the power input terminal of the second current Hall sensor chip U4. The first terminal of the eleventh capacitor C11 is connected to the output terminal of the first current Hall sensor chip U2 and the first DC current detection input terminal of the main control chip. The first terminal of the fourteenth capacitor C14 is connected to the output terminal of the second current Hall sensor chip U4 and the second DC current detection input terminal of the main control chip.

[0067] Further, refer to Figure 7 As shown, the two independent voltage divider resistor groups include a first voltage divider resistor group and a second voltage divider resistor group. The first voltage divider resistor group includes: a first varistor MOV1, a thirty-first resistor R31, a thirty-second resistor R32, a thirty-third resistor R33, a thirty-fourth resistor R34, a thirty-fifth resistor R35, and a first transient voltage suppressor diode TVS1. The first terminal of the first varistor MOV1 is connected to the first negative input terminal of the DC port, and the second terminal of the first varistor MOV1 is connected to both the first terminal of the thirty-first resistor R31 and the first positive input terminal of the DC port. The thirty-first resistor R31, the thirty-second resistor R32, the thirty-third resistor R33, the thirty-fourth resistor R34, and the thirty-fifth resistor R35 are connected in series. The second terminal of the thirty-fifth resistor R35 is connected to the first terminal of the first transient voltage suppressor diode TVS1, and the second terminal of the first transient voltage suppressor diode TVS1 is connected to the second terminal of the thirty-fourth resistor R34, the first terminal of the thirty-fifth resistor R35, and the input terminal of the first differential isolation chip U3.

[0068] Further, refer to Figure 8As shown, the two DC acquisition channels also include two identical operating voltage isolation circuits (a first operating voltage isolation circuit and a second operating voltage isolation circuit). The first operating voltage isolation circuit includes: a first isolation power supply chip PWR1, a seventh voltage reference chip U7, a twenty-first capacitor C21, a twenty-second capacitor C22, a twenty-third capacitor C23, a twenty-fourth capacitor C24, a thirty-fourth capacitor C34, a twentieth resistor R20, a twenty-second resistor R22, a twenty-fifth resistor R25, and a 5V power supply terminal. The input terminal of the first isolation power supply chip PWR1 is connected to the first terminal of the twenty-first capacitor C21, the first terminal of the twenty-second capacitor C22, and the 5V power supply terminal, respectively. The input ground terminal of the first isolation power supply chip PWR1 is connected to the second terminal of the twenty-first capacitor C21 and the second terminal of the twenty-second capacitor C22, respectively. The output terminal of the first isolation power supply chip PWR1 is connected to the twenty-third capacitor C24, the twenty-second capacitor C25, and the 5V power supply terminal, respectively. The first terminal of C23, the first terminal of the twenty-fourth capacitor C24, and the first terminal of the twentieth resistor R20 are connected. The output ground terminal of the first isolation power supply chip PWR1 is connected to the second terminal of the twenty-third capacitor C23 and the second terminal of the twenty-fourth capacitor C24, respectively. The second terminal of the twentieth resistor R20 is connected to the cathode of the seventh voltage reference chip U7, the first terminal of the twenty-second resistor R22, the first terminal of the thirty-fourth capacitor C34, and the power input terminal of the first differential isolation chip U3, respectively. The reference terminal of the seventh voltage reference chip U7 is connected to the second terminal of the twenty-second resistor R22 and the first terminal of the twenty-fifth resistor R25, respectively. The anode of the seventh voltage reference chip U7 is connected to the second terminal of the twenty-fifth resistor R25 and the second terminal of the thirty-fourth capacitor C34, respectively.

[0069] Further, refer to Figure 9As shown, the configuration circuits of the two differential isolation chips (first differential isolation chip U3 and second differential isolation chip U5) in the two DC acquisition channels are identical. For example, the configuration circuit of the first differential isolation chip U3 includes: second capacitor C2, seventh capacitor C7, eighth capacitor C8, tenth capacitor C10, twelfth capacitor C12, second ferrite bead L2, fourth ferrite bead L4, fifth resistor R5, and eighth resistor R8. The first power input terminal of the first differential isolation chip U3 is connected to the second terminal of the second ferrite bead L2 and the second terminal of the seventh capacitor C7, respectively. The first terminal of the second ferrite bead L2 is connected to the output terminal of the first working voltage isolation circuit. The positive input terminal of the first differential isolation chip U3 is connected to the second terminal of the eighth capacitor C8, the second terminal of the fifth resistor R5, and the first terminal of the tenth capacitor C10, respectively. The first terminal of the fifth resistor R5 is connected to the output terminal of the first voltage divider resistor group. The negative input terminal of the first differential isolation chip U3 is connected to the second terminal of the tenth capacitor C10, the second terminal of the eighth resistor R8, and the first terminal of the twelfth capacitor C12, respectively. The second power input terminal of the first differential isolation chip U3 is connected to the second terminal of the second capacitor C2 and the first terminal of the fourth ferrite bead L4, respectively. The second terminal of the fourth ferrite bead L4 is connected to the 5V power supply terminal.

[0070] Further, refer to Figure 10As shown, operational amplifier chip U6 is connected to the outputs of two differential isolation chips. Specifically, the configuration circuit of operational amplifier chip U6 includes: capacitor C26 (26th), capacitor C32 (32nd), capacitor C33 (33rd), capacitor C36 (36th), capacitor C40 (40th), resistor R1 (1st), resistor R4 (4th), resistor R16 (16th), resistor R18 (18th), resistor R19 (19th), resistor R24 ​​(24th), resistor R29 (29th), resistor R30 (30th), resistor R36 (36th), and resistor R37 (37th). The positive power input terminal of operational amplifier chip U6 is connected to the 3.3V power supply terminal and the first terminal of the thirty-second capacitor C32, respectively. The first positive input terminal of operational amplifier chip U6 is connected to the two terminals of the nineteenth resistor R19 and the first terminal of the twenty-fourth resistor R24, respectively. The first terminal of the nineteenth resistor R19 is connected to the positive output terminal of the first differential isolation chip U3. The first negative input terminal of operational amplifier chip U6 is connected to the second terminal of the eighteenth resistor R18, one terminal of the sixteenth resistor R16, and the first terminal of the twenty-sixth capacitor C26, respectively. The first terminal of the eighteenth resistor R18 is connected to the negative output terminal of the first differential isolation chip U3. The first output terminal of operational amplifier chip U6 is connected to the second terminal of the twenty-sixth capacitor C26, the second terminal of the sixteenth resistor R16, and the first terminal of the first resistor R1, respectively. The second terminal of the first resistor R1 is connected to the thirty-third... The first terminal of capacitor C33 is connected to the signal input terminal of the main control chip; the second positive input terminal of operational amplifier chip U6 is connected to the two terminals of the thirty-sixth resistor R36 and the first terminal of the thirty-seventh resistor R37, respectively; the first terminal of the thirty-sixth resistor R36 is connected to the positive output terminal of the second differential isolation chip; the second negative input terminal of operational amplifier chip U6 is connected to the second terminal of the thirtieth resistor R30, the first terminal of the twenty-ninth resistor R29, and the first terminal of the thirty-sixth capacitor C36, respectively; the first terminal of the thirtieth resistor R30 is connected to the negative output terminal of the second differential isolation chip; the second output terminal of operational amplifier chip U6 is connected to the second terminal of the thirty-sixth capacitor C36, the second terminal of the twenty-ninth resistor R29, and the first terminal of the fourth resistor R4, respectively; the second terminal of the fourth resistor R4 is connected to the first terminal of the fortieth capacitor C40 and the signal input terminal of the main control chip.

[0071] In this embodiment, reference Figure 12 and Figure 13As shown, the housing also includes an Ethernet interface 9 and an RS485 interface for communication. Ethernet interface 9 is an RJ45 interface supporting the Modbus TCP / IP protocol. The RS485 interface uses industrial-grade terminal blocks, supports the Modbus RTU protocol, and has built-in signal isolation protection circuitry. Ethernet interface 9 supports the Modbus TCP / IP protocol, enabling seamless access to industrial Ethernet and IoT platforms for high-speed remote data transmission. The RS485 interface is compatible with the Modbus RTU protocol, adapting to traditional industrial equipment and meeting the needs of hybrid networking of new and old systems.

[0072] Further, refer to Figure 11 As shown, the signal isolation protection circuit includes: resettable fuses (PPTC1, PPTC2), signal isolation chip U6, and single-channel inverter chip U7; two resettable fuses are configured, both used to connect the RS485 interface to the A / B bus input terminals of the signal isolation chip; the output terminal of the signal isolation chip U6 is connected to the main control chip; the input terminal of the single-channel inverter chip U7 is connected to the main control chip, and the output terminal of the single-channel inverter chip U7 is connected to the enable terminal of the signal isolation chip U6.

[0073] In this embodiment, reference Figure 12 As shown, the outer side of the casing also features a display screen 1 and physical buttons 2 connected to the main control chip. The display screen 1 uses a semi-reflective, semi-transmissive LCD screen that is visible in sunlight; the joint between the physical buttons 2 and the casing is filled with a silicone sealing ring. The semi-reflective, semi-transmissive LCD screen enhances display brightness by reflecting ambient light, significantly improving screen visibility under direct sunlight, making it suitable for outdoor or high-light scenarios (such as construction sites or field operations), avoiding the difficulty in reading information caused by reflection or insufficient brightness in traditional screens. The silicone sealing ring at the joint between the physical buttons 2 and the casing effectively prevents the intrusion of moisture, dust, oil, and other foreign objects, improving the device's protection level in humid, dusty, and oily environments (such as factories or rainy / snowy weather), and preventing button jamming or short-circuit malfunctions.

[0074] In this embodiment, a supercapacitor is also provided on the circuit board. The supercapacitor is connected in parallel with the main power supply on the circuit board. When the main power supply fails, the supercapacitor is used to provide backup power for the switching power supply detection device and maintain the device's continuous operation for at least 3 minutes.

[0075] In this embodiment, a temperature and humidity sensor is also provided on the circuit board. The temperature and humidity sensor is connected to the main control chip and is used to monitor the temperature and humidity of the environment where the switching power supply detection device is located.

[0076] Furthermore, this embodiment also proposes a switching power supply detection system, including: at least one of the aforementioned switching power supply detection devices; and a central monitoring platform communicatively connected to the switching power supply detection devices. Each switching power supply detection device detects data such as AC input, multiple DC inputs, and ambient temperature and humidity of the corresponding switching power supply, and sends the detected data to the central monitoring platform for display.

[0077] In summary, this utility model proposes a switching power supply detection device and system, which can simultaneously detect AC and DC signals. AC signal detection: An isolated sampling circuit is used, specifically, a voltage transformer isolates and samples the AC operating voltage, and a current transformer isolates and samples the AC operating current. Then, a single-phase energy metering chip outputs parameters such as operating voltage, operating current, active power, and apparent power. Finally, data communication is established with the main control chip via TX and RX. DC signal detection: Current acquisition uses a current Hall sensor chip to convert the current signal into a voltage signal, which is then output to the main control chip. The main control chip then outputs the DC current value. Voltage signal acquisition first divides the acquired voltage using a voltage divider resistor group, then performs differential isolation using a differential isolation chip to reduce interference. Next, an operational amplifier chip amplifies the differential voltage before outputting it to the main control chip. Finally, the main control chip outputs the DC voltage value.

[0078] Those skilled in the art will understand that embodiments of this invention can be provided as methods, systems, or computer program products. Therefore, this invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0079] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, as well as combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions.

[0080] It should be noted that in the description of this utility model, the word "a" or "an" preceding a component does not exclude the existence of multiple such components. This utility model can be implemented by means of hardware comprising several different components and by means of a suitably programmed computer. The use of terms such as first, second, third, etc., is merely for convenience of expression and does not indicate any order. These terms can be understood as part of the component names.

[0081] Furthermore, it should be noted that in the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "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 utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. Furthermore, 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.

[0082] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning of the basic inventive concept, can make other changes and modifications to these embodiments.

[0083] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope.

Claims

1. A switching power supply detection device, characterized in that, include: The housing and the circuit board inside the housing, the circuit board is equipped with a main control chip, an AC metering circuit connected to the main control chip and a multi-channel DC acquisition circuit; The AC metering circuit includes a current transformer and a voltage transformer connected to an AC port on the housing, and an energy metering chip connected to the current transformer and the voltage transformer via a high-speed switching diode array. The energy metering chip is connected to the main control chip. The multi-channel DC acquisition circuit includes at least two DC acquisition channels. Each DC acquisition channel includes a current Hall sensor chip connected to a DC port on the housing, a differential isolation chip connected to the DC port through an independent voltage divider resistor group, and an operational amplifier chip connected to the differential isolation chip. Both the current Hall sensor chip and the operational amplifier chip are connected to the main control chip.

2. The switching power supply detection device as described in claim 1, characterized in that, A bidirectional level conversion circuit is provided between the power metering chip and the main control chip; The bidirectional level conversion circuit includes: a first MOSFET, a second MOSFET, a 5V power supply terminal, a 3.3V power supply terminal, a fifty-third resistor, a fifty-seventh resistor, a fifty-eighth resistor, a sixty-seventh resistor, a seventieth resistor, and a seventy-first resistor; The source of the first MOSFET is connected to the signal output terminal of the power metering chip and the second terminal of the 57th resistor, the gate of the first MOSFET is connected to the second terminal of the 53rd resistor, the drain of the first MOSFET is connected to the second terminal of the 58th resistor and the signal input terminal of the main control chip, the 5V power supply terminal is connected to the first terminal of the 57th resistor and the first terminal of the 53rd resistor, and the 3.3V power supply terminal is connected to the first terminal of the 58th resistor. The source of the second MOSFET is connected to the second terminal of the seventy-first resistor and the signal output terminal of the main control chip, the gate of the second MOSFET is connected to the second terminal of the sixty-seventh resistor, the drain of the second MOSFET is connected to the signal input terminal of the power metering chip and the second terminal of the seventieth resistor, the 5V power supply terminal is connected to the first terminal of the seventieth resistor and the first terminal of the sixty-seventh resistor, and the 3.3V power supply terminal is connected to the first terminal of the seventy-first resistor.

3. The switching power supply detection device as described in claim 1, characterized in that, The voltage divider resistor group includes a varistor, a 31st resistor, a 32nd resistor, a 33rd resistor, a 34th resistor, a 35th resistor, and a transient voltage suppressor diode; The first end of the varistor is connected to the negative input terminal of the DC port, and the second end of the varistor is connected to the first end of the thirty-first resistor and the positive input terminal of the DC port, respectively. The thirty-first, thirty-second, thirty-third, thirty-fourth and thirty-fifth resistors are connected in series. The second end of the thirty-fifth resistor is connected to the first end of the transient voltage suppressor diode. The second end of the transient voltage suppressor diode is connected to the second end of the thirty-fourth resistor, the first end of the thirty-fifth resistor and the input terminal of the differential isolation chip, respectively.

4. The switching power supply detection device as described in claim 1, characterized in that, The multi-channel DC acquisition circuit also includes: a working voltage isolation circuit; The working voltage isolation circuit includes: an isolation power supply chip, a voltage reference chip, capacitors numbered twenty-first, twenty-second, twenty-third, twenty-fourth, and thirty-fourth, resistors numbered twentieth, twenty-second, and twenty-fifth, and a 5V power supply terminal; The input terminal of the isolation power supply chip is connected to the first terminal of the twenty-first capacitor, the first terminal of the twenty-second capacitor, and the 5V power supply terminal, respectively. The input ground terminal of the isolation power supply chip is connected to the second terminal of the twenty-first capacitor and the second terminal of the twenty-second capacitor, respectively. The output terminal of the isolation power supply chip is connected to the first terminal of the twenty-third capacitor, the first terminal of the twenty-fourth capacitor, and the first terminal of the twentieth resistor, respectively. The output ground terminal of the isolation power supply chip is connected to the second terminal of the twenty-third capacitor and the second terminal of the twenty-fourth capacitor, respectively. The second terminal of the twentieth resistor is connected to the cathode of the voltage reference chip, the first terminal of the twenty-second resistor, the first terminal of the thirty-fourth capacitor, and the power input terminal of the differential isolation chip, respectively. The reference terminal of the voltage reference chip is connected to the second terminal of the twenty-second resistor and the first terminal of the twenty-fifth resistor, respectively. The anode of the voltage reference chip is connected to the second terminal of the twenty-fifth resistor and the second terminal of the thirty-fourth capacitor, respectively.

5. The switching power supply detection device as described in claim 1, characterized in that, The housing is also equipped with an Ethernet interface and an RS485 interface for communication; The Ethernet interface is an RJ45 interface, supporting Modbus TCP / IP protocol; The RS485 interface uses industrial-grade terminal blocks, supports the Modbus RTU protocol, and has built-in signal isolation protection circuitry.

6. The switching power supply detection device as described in claim 5, characterized in that, The signal isolation protection circuit includes: a resettable fuse, a signal isolation chip, and a single-channel inverter chip; Two self-resetting fuses are configured, both used to connect the RS485 interface to the A / B bus access terminal of the signal isolation chip; The output of the signal isolation chip is connected to the main control chip; The input terminal of the single-channel inverter chip is connected to the main control chip, and the output terminal of the single-channel inverter chip is connected to the enable terminal of the signal isolation chip.

7. The switching power supply detection device as described in claim 1, characterized in that, The outer side of the casing also features a display screen and physical buttons that connect to the main control chip; The display screen is a semi-reflective, semi-transmissive LCD screen; The joint between the physical buttons and the housing is filled with a silicone sealing ring.

8. The switching power supply detection device as described in claim 1, characterized in that, The circuit board is also equipped with a supercapacitor, which is connected in parallel with the main power supply on the circuit board. When the main power supply fails, the supercapacitor is used to provide backup power for the switching power supply detection device and maintain the device's continuous operation for at least 3 minutes.

9. The switching power supply detection device as described in claim 1, characterized in that, The circuit board is also equipped with a temperature and humidity sensor, which is connected to the main control chip and is used to monitor the temperature and humidity of the environment where the switching power supply detection device is located.

10. A switching power supply detection system, characterized in that, include: At least one switching power supply detection device as described in any one of claims 1-9; A central monitoring platform that communicates with the switching power supply detection device.

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