Integrated direct current signal acquisition device

Abstract

The utility model relates to an integrated direct current signal acquisition device, which comprises an upper shell, a display panel, a power panel, a signal acquisition board and a lower shell, the upper shell and the lower shell are connected up and down to form an outer shell, and the display panel, the power panel and the signal acquisition board are arranged in the outer shell. The power supply board and the signal acquisition board are arranged below the display board in parallel, the power supply board is vertically connected to one side of the bottom surface of the display board, the signal acquisition board is vertically connected to the other side of the bottom surface of the display board, and the display board, the power supply board and the signal acquisition board are assembled in an inverted U shape; the power supply board, the signal acquisition board and the display board are connected with each other through pins, and the bottom of the power supply board and the bottom of the signal acquisition board are clamped in the lower shell. According to the utility model, a scheme that two printed boards are inserted into each other and a two-mold shape is adopted, so that the occupied volume of equipment is reduced, and the problem of insufficient internal space of a household charging pile is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of signal acquisition, in particular to an integrated direct current signal acquisition device, which is used for acquiring direct current voltage and current and processing the acquired signals. Background Art

[0002] With the implementation of energy conservation and emission reduction policies, new energy vehicles have developed rapidly, and the demand for corresponding car charging piles has also increased day by day, among which the demand for home charging piles has increased significantly. Compared with the high cost and large space of public charging piles, home charging piles have stricter requirements on cost control and external dimensions. Most of the traditional DC signal acquisition devices are four-mode products, which are large in size and are not specially designed for charging piles, so there are many redundant functions. Therefore, conventional DC signal acquisition devices can no longer fully meet the existing needs of the charging pile market in terms of cost and size. Selectively retaining the corresponding functions while reasonably compressing the cost and volume of the acquisition device is an important direction for current research and improvement. Summary of the invention

[0003] The purpose of the utility model is to overcome the above-mentioned shortcomings and provide an integrated DC signal acquisition device, which adopts a two-printed board plug-in solution and a two-mode appearance, compresses the volume occupied by the equipment, and solves the problem of insufficient internal space of a home charging pile.

[0004] The purpose of the utility model is achieved in this way:

[0005] An integrated DC signal acquisition device comprises an upper shell, a display panel, a power supply board, a signal acquisition board and a lower shell, wherein the upper shell and the lower shell are connected up and down to form an outer shell, wherein the outer shell is provided with a display panel, a power supply board and a signal acquisition board, wherein the power supply board and the signal acquisition board are arranged in parallel below the display panel, wherein the power supply board is vertically connected to one side of the bottom surface of the display panel, wherein the signal acquisition board is vertically connected to the other side of the bottom surface of the display panel, wherein the display panel, the power supply board and the signal acquisition board are assembled in an inverted U shape; wherein the power supply board, the signal acquisition board and the display panel are connected to each other by pins, wherein the bottoms of the power supply board and the signal acquisition board are clamped in the lower shell; wherein a display unit and a key unit are provided on the display panel, wherein a power supply module and a voltage conversion circuit are provided on the power supply board, wherein an MCU, a metering unit, a sampling circuit and an isolation circuit are provided on the signal acquisition board, wherein the power supply module and the metering unit are connected to the MCU, wherein the MCU is respectively connected to a storage unit, a display unit and a communication unit, wherein the metering unit is connected to a voltage signal and a current signal through a sampling circuit, and wherein the power supply module is also connected to an auxiliary power supply module.

[0006] Furthermore, a voltage conversion circuit is provided on the power board, and the voltage conversion circuit includes a protection circuit composed of a thermistor PT1 and a varistor RV1, a rectifier circuit composed of a safety capacitor C6, an inductor L2, diodes D1 and D3, a filter circuit composed of capacitors C5 and C7, a power module IC1, an LC circuit composed of a capacitor C1, an inductor L1 and a resistor R1, and grounding capacitors C2, C3, and C4.

[0007] Furthermore, the thermistor PT1 and the varistor RV1 are connected in series, the varistor RV1 is respectively connected in parallel with the capacitor C6 and the inductor L2, the inductor L2 is connected in parallel with the diode D3, the diode D3 is respectively connected in parallel with the capacitors C5, C7 and the resistor R2, a diode D1 is provided between the diode D3 and the capacitor C5, both ends of the resistor R2 are connected to pins 1 and 2 of the power module IC1, pin 3 of the power module IC1 is connected to the resistor R5 and grounded, pin 7 of the power module IC1 is connected to the capacitor C1, the inductor L1 and the resistor R1 connected in series, the other end of the resistor R1 is connected to pin 5 of the power module IC1, pin 8 of the power module IC1 is connected to the diode D2 and then grounded, pin 6 of the power module IC1 is connected to the resistor R3, and the resistor R1 is connected to the grounded capacitors C2, C3 and C4 connected in series.

[0008] Furthermore, the signal acquisition board is also provided with an isolation circuit, which includes a power chip IC2, an isolation transformer T1, diodes D4, D5, capacitors C8 and C9, one end of the power chip IC2 is connected to the inductor L3, and the other end is connected to the isolation transformer T1.

[0009] Furthermore, the isolation transformer T1 is connected to a filter circuit composed of capacitors C8 and C9 after passing through diodes D4 and D5.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] The utility model provides an integrated DC signal acquisition device, which adopts a two-printed board plug-in solution and a two-mode appearance, compresses the volume occupied by the device, and solves the problem of insufficient internal space of a home charging pile; at the same time, it retains the collection of one DC voltage and one DC current, the voltage is measured by connecting in parallel with the main circuit, and the current is measured by the main circuit current through a Hall sensor. At the same time, in order to facilitate on-site wiring, the device itself has a voltage output that can be used to power the Hall.

[0012] The utility model retains one communication and one pulse output function in auxiliary functions. The communication can transmit the collected signals to the core board of the charging pile in real time, ensuring that the charging pile can monitor the voltage and current of the load in real time. On the one hand, it can measure the electricity consumption of the electric vehicle to calculate the cost, and on the other hand, it can monitor the abnormal data and take corresponding measures in time to protect the equipment; the measurement meets the requirements of the existing national standards and realizes one pulse output, which can meet the needs of some users to detect pulse output to measure electricity; the display adopts liquid crystal display, which can provide users with intuitive viewing of power parameters such as voltage, current and electricity through the page turning display method; at the same time, it is equipped with a key circuit to provide customers with direct modification of communication parameters, setting parameters and passwords through the instrument. Compared with traditional devices, the utility model has the advantages of small size, convenient wiring, simple operation and low cost, which can better meet the needs of home charging piles. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model.

[0014] Figure 2 It is a circuit diagram of the voltage conversion circuit of the utility model.

[0015] Figure 3 It is a circuit diagram of the isolation circuit of the utility model.

[0016] Figure 4 This is a functional block diagram of the utility model.

[0017] in:

[0018] Upper housing 1, display panel 2, power supply panel 3, signal acquisition panel 4, lower housing 5. Implementation

[0019] In order to better understand the technical solution of the present invention, the following will be described in detail in conjunction with the relevant illustrations. It should be understood that the following specific embodiments are not intended to limit the specific implementation of the technical solution of the present invention, and are only implementations that can be adopted by the technical solution of the present invention. It should be noted that the description of the positional relationship of each component in this article, such as component A being located above component B, is based on the description of the relative positions of the components in the illustration, and is not intended to limit the actual positional relationship of the components. Example 1

[0020] See also Figure 1-Figure 4 , Figure 1The structural schematic diagram of the utility model is drawn. As shown in the figure, the utility model relates to an integrated DC signal acquisition device, which includes an upper shell 1, a display panel 2, a power board 3, a signal acquisition board 4 and a lower shell 5. The upper shell 1 and the lower shell 5 are connected up and down by snaps to form an outer shell, and the outer shell is provided with a display panel 2, a power board 3 and a signal acquisition board 4. The power board 3 and the signal acquisition board 4 are arranged side by side below the display panel 2. The power board 3 is vertically connected to one side of the bottom surface of the display panel 2, and the signal acquisition board 4 is vertically connected to the other side of the bottom surface of the display panel 2. The display panel 2, the power board 3 and the signal acquisition board 4 are assembled in an inverted U shape; the power board 3, the signal acquisition board 4 and the display panel 2 are connected to each other by pins, and the bottoms of the power board 3 and the signal acquisition board 4 are snapped into the lower shell 5.

[0021] The bottom surface of the lower housing 5 is installed in a guide rail manner, and the signal acquisition board 4 is connected to the external circuit through terminal wiring.

[0022] See also Figure 4 , Figure 4 The functional block diagram of the utility model is drawn. As shown in the figure, the display panel 2 is provided with a display unit and a key unit, the power panel 3 is provided with a power module and a voltage conversion circuit, the signal acquisition panel 4 is provided with an MCU, a metering unit, a sampling circuit and an isolation circuit, the power module and the metering unit are connected to the MCU, the MCU is respectively connected to the storage unit, the display unit and the communication unit, the metering unit is connected to a voltage signal and a current signal through a sampling circuit, and the power module is also connected to an auxiliary power module.

[0023] The inputs to the instrument are an auxiliary power supply, a DC voltage and a DC current. The auxiliary power supply is converted into a low voltage through the power supply circuit to power various hardware circuits inside the instrument. The voltage and current enter the metering unit through the sampling circuit and are transmitted to the single-chip microcomputer after data processing. The single-chip microcomputer displays the data collected by the instrument and its own measurement through the display unit, allowing customers to check the data intuitively and conveniently. On the other hand, by adding a button circuit, the internal parameters of the instrument can be set directly through buttons; at the same time, the communication circuit can realize data transmission between the instrument and the host computer, and can provide real-time reading of data for the charging pile.

[0024] See also Figure 2 , Figure 2The circuit diagram of the voltage conversion circuit of the utility model is drawn. As shown in the figure, the power supply board 3 is provided with a voltage conversion circuit, which includes a protection circuit composed of thermistor PT1 and varistor RV1, a rectifier circuit composed of safety capacitor C6, inductor L2, diodes D1 and D3, a filter circuit composed of capacitors C5 and C7, a power module IC1, an LC circuit composed of capacitor C1, inductor L1 and resistor R1, grounding capacitors C2, C3, C4, thermistor PT1 and varistor RV1 are connected in series, varistor RV1 is connected in parallel with capacitor C6 and inductor L2, inductor L2 is connected in parallel with diode D3, and diode D3 is connected in parallel with resistor R1. Capacitors C5, C7, and resistor R2 are connected in parallel, a diode D1 is provided between the diode D3 and the capacitor C5, both ends of the resistor R2 are connected to pins 1 and 2 of the power module IC1, pin 3 of the power module IC1 is connected to the resistor R5 and grounded, pin 7 of the power module IC1 is connected to the capacitor C1, inductor L1 and resistor R1 connected in series, the other end of the resistor R1 is connected to pin 5 of the power module IC1, pin 8 of the power module IC1 is connected to the diode D2 and then grounded, pin 6 of the power module IC1 is connected to the resistor R3, and the resistor R1 is connected to the grounded capacitors C2, C3 and C4 connected in series.

[0025] LN is the incoming line voltage AC 220V. Thermistor PT1 and varistor RV1 form a protection circuit. The subsequent safety capacitor C6 and inductor L2 play the role of EMC electromagnetic rectification, which can effectively reduce electromagnetic interference. D3 and D1 are rectifier circuits, which convert the AC signal into a steamed bun wave and output it to the back end. The filter circuit composed of C5 and C7 at the back end rectifies the input voltage signal into a standard DC signal and inputs it into the power module IC1. IC1 converts the high-voltage DC into a 5V DC voltage output. The back-end LC circuit and grounding capacitor both play a filtering role to filter out the clutter output by the power module and reduce interference signals.

[0026] Conventional switching power supply circuits take up too much space and cannot meet the dual-mode size requirements. In order to reduce the volume, this embodiment adopts a modular approach, changing the conventional multilateral transformer into a single-channel output transformer to convert the 220V voltage input into a 5V voltage output, which is used as the main circuit power supply voltage; the back-end considers the need for withstand voltage isolation between different networks, and uses a patch primary and secondary side equal-ratio transformer to isolate the communication power supply voltage and the auxiliary function power supply voltage, and meets the national standard withstand voltage requirements by modifying the routing and selecting the corresponding component parameters.

[0027] See also Figure 3 , Figure 3The circuit diagram of the isolation circuit of the utility model is drawn. As shown in the figure, the signal acquisition board 4 is also provided with an isolation circuit, which includes a power chip IC2, an isolation transformer T1, diodes D4, D5, capacitors C8 and C9, one end of the power chip IC2 is connected to the inductor L3, and the other end is connected to the isolation transformer T1, and the isolation transformer T1 is connected to the filter circuit composed of capacitors C8 and C9 after passing through diodes D4 and D5.

[0028] The voltage conversion circuit actually outputs a DC signal. The isolation transformer T1 cannot isolate the DC signal, so the power chip IC2 is used to convert the corresponding DC to AC. The inductor L3 acts as a clamp here to prevent the abnormal front-end voltage from damaging the back-end circuit. The converted AC signal is converted 1:1 through the SMD transformer, and is output after rectification by D4 and D5. The back-end C8 and C9 form a filter circuit.

[0029] Working principle:

[0030] The utility model provides an integrated DC signal acquisition device. The selection of the installation method is based on customer needs. Since there is no need to directly observe the instrument display from the charging pile panel, an embedded structure is not selected, thereby avoiding the inconvenience of grooving required for embedded installation. Instead, the selected guide rail structure is more convenient for disassembly and installation. The instrument is installed on the guide rail by snapping, which can effectively avoid the problem of loose instrument installation caused by equipment shaking during transportation. The selection of external terminals is convenient for customer on-site installation and wiring, and is also convenient for production commissioning and inspection as well as customer on-site functional testing of multiple instruments in the same environment. The instrument can be directly replaced for testing by plugging and unplugging, without rewiring, thereby improving production and testing efficiency.

[0031] The housing of the utility model is stepped, and the sections are sunken to leave ample space for wiring. The LCD display and the buttons are on the same plane, which is convenient for customers to check and modify parameters. At the same time, the display panel is more three-dimensional visually and looks more concise and clean. A notch is reserved at the lower end of the printed circuit board, and a corresponding bulge is also made at the corresponding position of the lower housing, which plays a role in fixing the board and confirming the installation direction, preventing the problem of reverse installation during the production process; the entire table is fixed with buckles, and screws are not used, which solves the problem of easy loss of parts from the root, and can simplify the production and assembly steps and improve production efficiency.

[0032] The above are only specific application examples of the utility model, and do not constitute any limitation on the protection scope of the utility model. Any technical solution formed by equivalent transformation or equivalent replacement falls within the protection scope of the utility model.

Claims

1. An integrated DC signal acquisition device, characterized in that: It comprises an upper shell (1), a display panel (2), a power supply board (3), a signal acquisition board (4) and a lower shell (5); the upper shell (1) and the lower shell (5) are connected up and down to form an outer shell; the outer shell is provided with a display panel (2), a power supply board (3) and a signal acquisition board (4); the power supply board (3) and the signal acquisition board (4) are arranged in parallel below the display panel (2); the power supply board (3) is vertically connected to one side of the bottom surface of the display panel (2); the signal acquisition board (4) is vertically connected to the other side of the bottom surface of the display panel (2); the display panel (2), the power supply board (3) and the signal acquisition board (4) are assembled in an inverted U shape; the power supply board (3) and the signal acquisition board (4) are arranged in parallel below the display panel (2); the power supply board (3) and the signal acquisition board (4) are vertically connected to one side of the bottom surface of the display panel (2); the power supply board (3) and the signal acquisition board (4) are assembled in an inverted U shape; The board (3), the signal acquisition board (4) and the display board (2) are connected to each other by means of pins, and the bottoms of the power board (3) and the signal acquisition board (4) are snap-fitted into the lower shell (5); the display board (2) is provided with a display unit and a key unit, the power board (3) is provided with a power module and a voltage conversion circuit, the signal acquisition board (4) is provided with an MCU, a metering unit, a sampling circuit and an isolation circuit, the power module and the metering unit are connected to the MCU, the MCU is respectively connected to the storage unit, the display unit and the communication unit, the metering unit is connected to a voltage signal and a current signal via a sampling circuit, and the power module is also connected to an auxiliary power module.

2. The integrated DC signal acquisition device according to claim 1, characterized in that: The power board (3) is provided with a voltage conversion circuit, which includes a protection circuit composed of a thermistor PT1 and a varistor RV1, a rectifier circuit composed of a safety capacitor C6, an inductor L2, diodes D1 and D3, a filter circuit composed of capacitors C5 and C7, an LC circuit composed of a power module IC1, a capacitor C1, an inductor L1 and a resistor R1, and grounding capacitors C2, C3, and C4.

3. The integrated DC signal acquisition device according to claim 2, characterized in that: The thermistor PT1 and the varistor RV1 are connected in series, the varistor RV1 is connected in parallel with the capacitor C6 and the inductor L2 respectively, the inductor L2 is connected in parallel with the diode D3, the diode D3 is connected in parallel with the capacitors C5, C7 and the resistor R2 respectively, a diode D1 is provided between the diode D3 and the capacitor C5, both ends of the resistor R2 are connected to pins 1 and 2 of the power module IC1, the pin 3 of the power module IC1 is connected to the resistor R5 and grounded, the pin 7 of the power module IC1 is connected to the capacitor C1, the inductor L1 and the resistor R1 connected in series, the other end of the resistor R1 is connected to the pin 5 of the power module IC1, the pin 8 of the power module IC1 is connected to the diode D2 and then grounded, the pin 6 of the power module IC1 is connected to the resistor R3, and the resistor R1 is connected to the grounded capacitors C2, C3 and C4 connected in series.

4. The integrated DC signal acquisition device according to claim 1, characterized in that: The signal acquisition board (4) is also provided with an isolation circuit, which comprises a power chip IC2, an isolation transformer T1, diodes D4, D5, capacitors C8 and C9, one end of the power chip IC2 is connected to the inductor L3, and the other end is connected to the isolation transformer T1.

5. The integrated DC signal acquisition device according to claim 4, characterized in that: The isolation transformer T1 is connected to a filter circuit composed of capacitors C8 and C9 after passing through diodes D4 and D5.

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