Measurement unit production detection device

Abstract

The utility model discloses a measuring unit production detection device which comprises a measuring unit, a measuring unit production detection device circuit board and a current transformer, and the measuring unit production detection device circuit board comprises a serial port level conversion circuit, an ADC voltage sampling circuit, an AC voltage interface and a first current interface. The measuring unit comprises a voltage interface, a second current interface, a switching value interface, an IIC interface, a 12V interface and a serial port interface; the upper computer is connected with the serial port interface through a serial port level conversion circuit; the ADC voltage sampling circuit is connected with the IIC interface and the 12V interface; the current transformer is connected with the second current interface through the first current interface; the AC voltage interface is connected with the voltage interface. The measuring unit production detection device is simple in structure and easy to manufacture, can be separated from an intelligent measuring switch body for detection, the detection process is not influenced by the body, a plurality of measuring units can be detected each time without mutual influence, and the detection efficiency is high.

Description

Technical Field

[0001] The utility model relates to a measuring unit production detection device, belonging to the technical field of smart grid and smart electricity consumption. Background Art

[0002] With the rapid development of my country's economy, the number of residential communities is increasing, and the electricity load of residents continues to increase. In order to effectively manage the load of residents, more and more resident meter boxes are installed with intelligent measuring switches. Intelligent measuring switches are low-voltage switching appliances with high-precision current sensors and measuring modules. They are used to realize the normal connection and disconnection or overload short-circuit protection functions of distribution lines, and can realize local or remote interaction of data, node voltage, current, electric energy and other monitoring, and segmented lean processing functions. Due to the powerful functions of intelligent measuring switches, they are gradually replacing the non-intelligent molded case circuit breakers installed in the original resident meter boxes. The application of measuring units used with intelligent measuring switches is also increasing.

[0003] At present, the method generally adopted by manufacturers of intelligent measuring switches for production testing of measuring units is: installing the measuring unit in the intelligent measuring switch body for testing.

[0004] This detection method has the following problems:

[0005] 1. Low detection efficiency, only one measuring unit is intelligently detected each time;

[0006] 2. If the intelligent measuring switch body is missing, detection will not be possible;

[0007] 3. If there is a problem with the intelligent measuring switch itself, the detection will affect the functional detection of the measuring unit.

[0008] Due to the existence of these problems, the production efficiency is greatly reduced and the production cost is also increased.

[0009] Therefore, a new measuring unit production and testing device is needed to solve the above problems. Utility Model Content

[0010] The purpose of the utility model is to provide a measuring unit production detection device to solve the problems raised in the above background technology.

[0011] A measuring unit production detection device comprises a measuring unit, a measuring unit production detection device circuit board and a current transformer, wherein the measuring unit production detection device circuit board comprises a serial port level conversion circuit, an ADC voltage sampling circuit, an AC voltage interface and a first current interface,

[0012] The measuring unit includes a voltage interface, a second current interface, a switch quantity interface, an IIC interface, a 12V interface and a serial port interface.

[0013] The host computer is connected to the serial port interface through the serial port level conversion circuit;

[0014] The ADC voltage sampling circuit is connected to the IIC interface and the 12V interface;

[0015] The current transformer is connected to the second current interface via the first current interface;

[0016] The AC voltage interface is connected to the voltage interface.

[0017] Furthermore, the ADC voltage sampling circuit includes a PCF8591T chip, the PCF8591T chip includes an SDA pin and an SCL pin, the SDA pin and the SCL pin are respectively connected to the IIC_SDA1 terminal and the IIC_SCL1 terminal, and the IIC_SDA1 terminal and the IIC_SCL1 terminal are respectively connected to the +3.3V voltage terminal through resistors R21 and R20. The setting of the ADC voltage sampling circuit enables the utility model to have an ADC sampling function.

[0018] Furthermore, the ADC voltage sampling circuit includes a PCF8591T chip, and the PCF8591T chip includes an AIN0 pin, a VDD pin, an AOUT pin and a VREF pin. The AIN0 pin is connected to a +12V voltage terminal through a resistor R13, the VDD pin is connected to a +3.3V voltage terminal through a resistor R88, the VDD pin is grounded through a capacitor C49, and the AOUT pin and the VREF pin are connected to an AOUT1 terminal and a VREF1 terminal, respectively.

[0019] Furthermore, the PCF8591T chip also includes an AIN1 pin, an AIN2 pin, an AIN3 pin, an A0 pin, an A1 pin, an A2 pin, a VSS pin, an AGND pin and an EXT pin. The AIN1 pin, the AIN2 pin and the AIN3 pin are grounded through resistors R85, R86 and R87 respectively, and the A0 pin, A1 pin, A2 pin, VSS pin, AGND pin and EXT pin are all grounded.

[0020] Furthermore, the IIC interface includes an IIC_SDA1 terminal and an IIC_SCL1 terminal.

[0021] Furthermore, the measuring unit production detection device circuit board also includes a switch quantity detection circuit, and the switch quantity detection circuit is connected to the switch quantity interface.

[0022] Furthermore, the number of the current transformers is n, where n is greater than or equal to 1.

[0023] Beneficial effects: The measuring unit production detection device of the utility model has a simple structure and is easy to manufacture. It can be detected without the intelligent measuring switch body. The detection process is not affected by the body. Multiple measuring units can be detected each time without being affected by each other, and the detection efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A first structural schematic diagram of a production detection device for a measurement unit;

[0025] Figure 2 It is the functional interface of the measurement unit;

[0026] Figure 3 It is a voltage ADC sampling circuit;

[0027] Figure 4 A second structural schematic diagram of a measuring unit production detection device. Implementation

[0028] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application. Example

[0029] See also Figure 1 and Figure 4 As shown, the measuring unit production detection device of the utility model includes a measuring unit, a measuring unit production detection device circuit board and a current transformer. The measuring unit production detection device circuit board includes a serial port level conversion circuit, an ADC voltage sampling circuit, an AC voltage interface and a first current interface. The measuring unit includes a voltage interface, a second current interface, a switch interface, an IIC interface, a 12V interface and a serial port interface. The host computer is connected to the serial port interface through the serial port level conversion circuit; the ADC voltage sampling circuit is connected to the IIC interface and the 12V interface; the current transformer is connected to the second current interface through the first current interface; and the AC voltage interface is connected to the voltage interface.

[0030] The functions of the circuit board of the measuring unit production test device are as follows:

[0031] 1) Used to fix the measuring unit, multiple units can be fixed at one time for testing;

[0032] 2) Used for serial port level conversion and data exchange with the host computer;

[0033] 3) With ADC sampling function;

[0034] 4) Provide a detection interface for the device under test.

[0035] The circuit board of the measuring unit production detection device also includes a switch quantity detection circuit, and the switch quantity detection circuit is connected to the switch quantity interface.

[0036] The device under test is a measuring unit to be detected. The current transformer is the same type of current transformer as the intelligent measuring switch, which provides the required current signal for the device under test.

[0037] See also Figure 1-4 As shown, the detection steps of the measuring unit production detection device of the utility model are as follows:

[0038] Step 1: The host computer controls the precision source output voltage and current (such as: AC220V, 10A);

[0039] Among them, ① the AC220V voltage is connected to the measuring unit after passing through the measuring unit production and detection device circuit board, and the measuring unit starts to work, and at the same time inputs DC12V through its weak current interface to provide power for the measuring unit production and detection device circuit board;

[0040] ②After the 10A current passes through the current transformer of the intelligent measuring switch, it is connected to the measuring unit.

[0041] Step 2: The host computer exchanges data with the detected measuring unit through the serial port;

[0042] Among them, the serial port completes level conversion on the circuit board of the measurement unit production detection device to ensure level matching.

[0043] Step 3: Detect current, voltage and other variables;

[0044] Step 4: Test the DC12V output of the measuring unit;

[0045] Among them, ① the DC12V output by the measurement unit passes through the voltage ADC sampling circuit (such as Figure 3 );

[0046] ②The ADC sampling chip (PCF8591T) transmits the sampling output results to the measurement unit through the IIC interface;

[0047] ③The measuring unit transmits the sampling data to the host computer through the serial port for judgment;

[0048] ④This step also tests the DC12V power output, IIC interface and other functions of the measurement unit.

[0049] Step 5: Detect the switch value CLOSE_Sta signal;

[0050] Step 6: Display the detection results on the host computer.

[0051] The entire detection process is separated from the intelligent measuring switch body detection, the steps are simple, efficient and fast.

Claims

1. A measuring unit production detection device, characterized in that: It includes a measuring unit, a measuring unit production and detection device circuit board and a current transformer. The measuring unit production and detection device circuit board includes a serial port level conversion circuit, an ADC voltage sampling circuit, an AC voltage interface and a first current interface. The measuring unit includes a voltage interface, a second current interface, a switch quantity interface, an IIC interface, a 12V interface and a serial port interface. The host computer is connected to the serial port interface through the serial port level conversion circuit; The ADC voltage sampling circuit is connected to the IIC interface and the 12V interface; The current transformer is connected to the second current interface via the first current interface; The AC voltage interface is connected to the voltage interface.

2. The measuring unit production detection device according to claim 1, characterized in that: The ADC voltage sampling circuit includes a PCF8591T chip, and the PCF8591T chip includes an SDA pin and an SCL pin, and the SDA pin and the SCL pin are respectively connected to an IIC_SDA1 terminal and an IIC_SCL1 terminal, and the IIC_SDA1 terminal and the IIC_SCL1 terminal are respectively connected to a +3.3V voltage terminal through a resistor R21 and a resistor R20.

3. The measuring unit production detection device according to claim 2, characterized in that: The PCF8591T chip also includes an AIN0 pin, a VDD pin, an AOUT pin and a VREF pin. The AIN0 pin is connected to a +12V voltage terminal through a resistor R13, the VDD pin is connected to a +3.3V voltage terminal through a resistor R88, the VDD pin is grounded through a capacitor C49, and the AOUT pin and the VREF pin are connected to an AOUT1 terminal and a VREF1 terminal respectively.

4. The measuring unit production detection device according to claim 3, characterized in that: The PCF8591T chip also includes an AIN1 pin, an AIN2 pin, an AIN3 pin, an A0 pin, an A1 pin, an A2 pin, a VSS pin, an AGND pin and an EXT pin. The AIN1 pin, the AIN2 pin and the AIN3 pin are grounded through resistors R85, R86 and R87 respectively, and the A0 pin, the A1 pin, the A2 pin, the VSS pin, the AGND pin and the EXT pin are all grounded.

5. The measuring unit production detection device according to claim 2, characterized in that: The IIC interface includes an IIC_SDA1 terminal and an IIC_SCL1 terminal.

6. The measuring unit production detection device according to claim 1, characterized in that: The circuit board of the measuring unit production detection device also includes a switch quantity detection circuit, and the switch quantity detection circuit is connected to the switch quantity interface.

7. The measuring unit production detection device according to claim 1, characterized in that: The number of the current transformers is n, where n is greater than or equal to 1.

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