Circuit sampling device and charging pile comprising same

Abstract

The utility model discloses a circuit sampling device and a charging pile comprising the same, the circuit sampling device comprises a single-chip microcomputer, a current sampling module, a voltage differential sampling module and a voltage single-end sampling module, all of which are connected with the single-chip microcomputer; the current sampling module comprises a metering chip connected with the single-chip microcomputer, the voltage differential sampling module comprises a first operational amplifier circuit and a first adjusting circuit which are connected in sequence, and the voltage single-end sampling module comprises a second operational amplifier circuit and a second adjusting circuit which are connected in sequence. At least one of the voltage differential sampling modules and the voltage single-end sampling modules is multiple. According to the circuit sampling device and the charging pile comprising the circuit sampling device, only one metering chip is used for current sampling, and a single-chip microcomputer is used for calculation processing for multi-path voltage sampling, so that the number of used metering chips is greatly reduced, and the product cost is reduced; when the single-chip microcomputer is used to calculate the AC voltage, the anti-interference performance and the load compatibility are relatively good, and the product performance is ensured.

Description

Technical Field

[0001] The utility model relates to the field of electric control components, and in particular to a circuit sampling device and a charging pile comprising the same. Background Art

[0002] In equipment such as new energy vehicle charging piles, there are often application scenarios where multiple AC voltage and current sampling coexist, and there are high requirements for the accuracy, stability and anti-interference of the sampling circuit. As the current competition in the new energy vehicle industry intensifies, the demand for reducing costs is even stronger.

[0003] In the prior art, Hall sensors are usually used for sampling to meet the anti-interference performance requirements, but Hall sensors are relatively expensive and are not suitable for products with cost constraints. In products such as AC charging piles with higher cost constraints, the prior art usually uses multiple metering chips for calculation after sampling. If the product requires multi-channel voltage detection, at least 5 metering chips are required, which increases the product cost.

[0004] In view of the above-mentioned defects, the present invention proposes a new circuit sampling device and a charging pile including the same. Utility Model Content

[0005] The purpose of the utility model is to provide a circuit sampling device and a charging pile including the same, so as to reduce the number of processing elements required for circuit sampling and reduce the cost of the product.

[0006] The utility model solves the above technical problems through the following technical solutions:

[0007] The utility model provides a circuit sampling device, comprising a single chip microcomputer, a current sampling module, a voltage differential sampling module and a voltage single-ended sampling module, wherein the current sampling module, the voltage differential sampling module and the voltage single-ended sampling module are all electrically connected to the single chip microcomputer;

[0008] The current sampling module includes a metering chip, which is electrically connected to the single-chip computer and is used to output a digital signal of the current value;

[0009] The voltage differential sampling module comprises a first operational amplifier circuit and a first regulating circuit electrically connected in sequence, and is used to output continuous analog signals of multiple AC voltages; the voltage single-ended sampling module comprises a second operational amplifier circuit and a second regulating circuit electrically connected in sequence, and is used to output continuous analog signals of a single AC voltage; at least one of the voltage differential sampling module and the voltage single-ended sampling module is in plurality;

[0010] The circuit sampling device also includes a first power supply, a second power supply and a third power supply. The first power supply and the third power supply are electrically connected to the voltage differential sampling module and the voltage single-ended sampling module. The second power supply is electrically connected to the first regulating circuit and the second regulating circuit.

[0011] In this technical solution, only current sampling uses one metering chip for calculation, and multi-channel voltage sampling uses a single-chip microcomputer for calculation and processing, which greatly reduces the number of chips used in the circuit sampling device and reduces product costs; at the same time, when using a single-chip microcomputer to calculate the AC voltage, its anti-interference and load compatibility are relatively good, thereby ensuring product performance.

[0012] Preferably, the current sampling module includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a second capacitor, a third capacitor and a current transformer;

[0013] The current transformer comprises a main coil (2101) and a secondary coil (2102), two ends of the main coil (2101) are respectively connected to a first input end and an output end, the first resistor and the second resistor are connected in parallel and electrically connected to two ends of the secondary coil (2102), one end of the third resistor is electrically connected to the first resistor and the second resistor, and the other end is grounded; two ends of the fourth resistor are respectively electrically connected to the secondary coil (2102) of the current transformer and a second pin of the metering chip, and two ends of the fifth resistor are respectively electrically connected to the secondary coil (2102) of the current transformer and a fourth pin of the metering chip;

[0014] One end of the first capacitor is electrically connected to the fifth resistor, and the other end is grounded; one end of the second capacitor is electrically connected to the fourth resistor, and the other end is grounded; one end of the third capacitor is electrically connected to the first power supply, and the other end is grounded; the first power supply is electrically connected to the first pin of the metering chip.

[0015] In this technical solution, after the AC current is sampled by the current transformer, it is converted into an AC voltage through multiple resistors for voltage division and multiple capacitors for filtering, and then input into the metering chip, which calculates its effective value.

[0016] Preferably, a first node is provided between the fifth resistor and the fourth pin of the metering chip, and the third pin of the metering chip is electrically connected to the first node.

[0017] In the present technical solution, the metering chip is usually used for both current sampling and voltage sampling. The third pin and the fourth pin of the metering chip are connected to the first node so that the metering chip can still work normally when only processing current.

[0018] Preferably, the current sampling module also includes a sixth resistor, a seventh resistor and a first output port; the fifth pin of the metering chip is grounded, and a second node is provided between the fifth pin of the metering chip and the ground; the two ends of the sixth resistor are electrically connected to the fifth pin of the metering chip and the seventh resistor respectively, and the seventh resistor is connected to the second node; a first output port is provided between the sixth resistor and the seventh resistor, and the first output port is electrically connected to the single-chip computer.

[0019] In the present technical solution, the sixth resistor and the seventh resistor are connected in series to prevent the electrical signal output by the metering chip from being too strong, thereby avoiding interference with the output of the first output port.

[0020] Preferably, the first operational amplifier circuit comprises an eighth resistor, a ninth resistor, a first load resistor, a second load resistor and a first operational amplifier; two ends of the first load resistor are electrically connected to the second input terminal and the inverting pin of the first operational amplifier, respectively, and two ends of the second load resistor are electrically connected to the third input terminal and the non-inverting pin of the first operational amplifier, respectively;

[0021] One end of the eighth resistor is connected to one end of the first load resistor close to the first operational amplifier, and the other end is connected to the output pin of the first operational amplifier; one end of the ninth resistor is connected to one end of the second load resistor close to the first operational amplifier, and the other end is grounded;

[0022] The first operational amplifier circuit also includes a fourth capacitor and a fifth capacitor, the fourth capacitor is connected in parallel with the eighth resistor, and the fifth capacitor is connected in parallel with the ninth resistor; the first power supply is electrically connected to the positive power supply pin of the first operational amplifier, and the third power supply is electrically connected to the negative power supply pin of the first operational amplifier.

[0023] In the present technical solution, for the second input terminal, the first load resistor is a pull-up resistor, the ninth resistor is a pull-down resistor, the ground line is divided by resistance, and the fifth capacitor is decoupled and filtered to the inverting pin of the first operational amplifier; for the third input terminal, the second load resistor is a pull-up resistor, the ninth resistor is a pull-down resistor, the ground line is divided by resistance, and the fifth capacitor is decoupled and filtered to the non-inverting pin of the first operational amplifier; at this time, the operational amplifier gain is 1, and the first operational amplifier circuit acts as a buffer for impedance matching to improve anti-interference capability.

[0024] Preferably, the first regulation circuit includes a first diode, a second diode, a third diode, a twelfth resistor, a thirteenth resistor, an eighth capacitor, a ninth capacitor and a second output port; one end of the first diode is electrically connected to the output pin of the first operational amplifier, and the other end is connected in series with the twelfth resistor, the thirteenth resistor, the second diode, the third diode and the second power supply in sequence, the eighth capacitor is connected in parallel with the thirteenth resistor and forms a first parallel unit connected in series with the twelfth resistor, the ninth capacitor is connected in parallel with the twelfth resistor and the first parallel unit, and the end of the third diode away from the second power supply is provided with a second output port electrically connected to the single-chip computer.

[0025] In this technical solution, the signal output by the first operational amplifier is half-wave rectified by the first diode, and then second-order filtered by the twelfth resistor, the thirteenth resistor, the eighth capacitor and the ninth capacitor to form a DC voltage, which is output to the microcontroller through the second output port and the voltage is calculated.

[0026] Preferably, the second operational amplifier circuit comprises a tenth resistor, an eleventh resistor, a third load resistor and a second operational amplifier; two ends of the third load resistor are electrically connected to the fourth input terminal and the non-inverting pin of the second operational amplifier respectively, one end of the tenth resistor is connected to the inverting pin of the second operational amplifier, and the other end is connected to the output pin of the second operational amplifier; one end of the eleventh resistor is connected to one end of the third load resistor close to the second operational amplifier, and the other end is grounded;

[0027] The second operational amplifier circuit also includes a sixth capacitor and a seventh capacitor, the sixth capacitor is connected in parallel with the tenth resistor, and the seventh capacitor is connected in parallel with the eleventh resistor; the first power supply is electrically connected to the positive power supply pin of the second operational amplifier, and the third power supply is electrically connected to the negative power supply pin of the second operational amplifier.

[0028] In the present technical solution, for the fourth input terminal, the third load resistor is a pull-up resistor, the eleventh resistor is a pull-down resistor, the ground line is divided by resistance, and the seventh capacitor is decoupled and filtered and output to the non-inverting pin of the second operational amplifier. At this time, the operational amplifier gain is 1, and the second operational amplifier circuit is used as a buffer for impedance matching, thereby improving the anti-interference ability.

[0029] Preferably, the second regulation circuit includes a fourth diode, a fifth diode, a sixth diode, a fourteenth resistor, a fifteenth resistor, a tenth capacitor, an eleventh capacitor and a third output port; one end of the fourth diode is electrically connected to the output pin of the second operational amplifier, and the other end is connected in series with the fourteenth resistor, the fifteenth resistor, the fifth diode, the sixth diode and the second power supply in sequence, the tenth capacitor is connected in parallel with the fifteenth resistor and forms a second parallel unit connected in series with the fourteenth resistor, the eleventh capacitor is connected in parallel with the fourteenth resistor and the second parallel unit, and the end of the sixth diode away from the second power supply is provided with a third output port electrically connected to the single-chip computer.

[0030] In this technical solution, the signal output by the second operational amplifier is half-wave rectified by the fourth diode, and then second-order filtered by the fourteenth resistor, the fifteenth resistor, the tenth capacitor, and the eleventh capacitor to form a DC voltage, which is output to the microcontroller through the third output port and the voltage is calculated.

[0031] Preferably, the circuit sampling device further comprises a display module, which is electrically connected to the single-chip microcomputer and is used to display the calculation result of the single-chip microcomputer.

[0032] In this technical solution, the display module displays the processing results of the single chip microcomputer, thereby facilitating use by operators.

[0033] The utility model also provides a charging pile, characterized by comprising a circuit sampling device as described in any one of the above items.

[0034] In the present technical solution, the charging pile includes the above-mentioned circuit sampling device, which reduces product cost and ensures the accuracy of detection.

[0035] On the basis of conforming to the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present utility model.

[0036] The positive and progressive effects of the utility model are:

[0037] The circuit sampling device of the utility model and the charging pile including the same use only one metering chip for calculation in current sampling, while multi-channel voltage sampling all uses a single-chip microcomputer for calculation and processing, thereby greatly reducing the number of chips used in the circuit sampling device and reducing product costs; at the same time, when the single-chip microcomputer is used to calculate the AC voltage, its anti-interference and load compatibility are relatively good, thereby ensuring product performance.

[0038] To further understand the features and technical contents of the present application, please refer to the following detailed description and drawings of the present application. However, the detailed description and drawings here are only used to illustrate the present application and do not impose any limitations on the scope of the claims of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The above and other features and advantages of the present application will become more apparent by describing in detail example embodiments thereof with reference to the attached drawings.

[0040] Figure 1 It is a schematic diagram of the principle of the circuit sampling device of an embodiment of the utility model.

[0041] Figure 2 Schematic diagram of a circuit of a current sampling module of a circuit sampling device according to an embodiment of the present utility model.

[0042] Figure 3 Schematic diagram of a circuit of a voltage differential sampling module of a circuit sampling device according to an embodiment of the utility model.

[0043] Figure 4 Schematic diagram of a circuit of a voltage single-ended sampling module of a circuit sampling device according to an embodiment of the utility model.

[0044] Figure 5 This is a voltage sampling signal waveform diagram of the circuit sampling device according to an embodiment of the utility model.

[0045] Reference numerals

[0046] 1. Microcontroller

[0047] 2 Current sampling module

[0048] 3 Voltage differential sampling module

[0049] 4 Voltage single-ended sampling module

[0050] 5 Display module

[0051] 6 First Power

[0052] 7 Second power supply

[0053] 8 Third power supply

[0054] 201 Metering Chip

[0055] 21 First pin

[0056] 22 Second pin

[0057] 23 Third pin

[0058] 24 Fourth pin

[0059] 25 Fifth pin

[0060] 26 Sixth pin

[0061] 27 Seventh pin

[0062] 28 Eighth pin

[0063] 202 First resistor

[0064] 203 Second resistor

[0065] 204 The third resistor

[0066] 205 Fourth resistor

[0067] 206 Fifth resistor

[0068] 207 First Capacitor

[0069] 208 Second capacitor

[0070] 209 The third capacitor

[0071] 210 Current transformer

[0072] 2101 Main Coil

[0073] 2102 Auxiliary coil

[0074] 211 First input

[0075] 212 Output

[0076] 213 First Node

[0077] 214 Sixth resistor

[0078] 215 Seventh Resistor

[0079] 216 Second Node

[0080] 217 First output port

[0081] 301 Eighth Resistor

[0082] 302 Ninth Resistor

[0083] 303 First load resistor

[0084] 304 Second load resistor

[0085] 305 First Operational Amplifier

[0086] 306 Fourth Capacitor

[0087] 307 Fifth Capacitor

[0088] 308 First diode

[0089] 309 Second diode

[0090] 310 The third diode

[0091] 311 12th resistor

[0092] 312 Thirteenth resistor

[0093] 313 Eighth Capacitor

[0094] 314 The Ninth Capacitor

[0095] 315 Second output port

[0096] 316 Second input terminal

[0097] 317 Third input terminal

[0098] 401 Tenth resistor

[0099] 402 11th resistor

[0100] 403 Third load resistor

[0101] 404 Second operational amplifier

[0102] 405 Fourth input terminal

[0103] 406 Sixth Capacitor

[0104] 407 Seventh Capacitor

[0105] 408 Fourth diode

[0106] 409 Fifth Diode

[0107] 410 Sixth diode

[0108] 411 Fourteenth resistor

[0109] 412 Fifteenth resistor

[0110] 413 Tenth Capacitor

[0111] 414 Eleventh Capacitor

[0112] 415 Third output port

[0113] A Input voltage waveform

[0114] B Output voltage waveform DETAILED DESCRIPTION

[0115] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the present application. The present application can also be implemented or applied through other different specific implementation methods, and the details in the present application can also be modified or changed in various ways according to different viewpoints and application systems without departing from the spirit of the present application. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0116] The following is a detailed description of the embodiments of the present application with reference to the accompanying drawings so that those skilled in the art can easily implement the present application. The present application can be embodied in a variety of different forms and is not limited to the embodiments described herein.

[0117] In the representations of the present application, the representations with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics represented in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the represented specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples represented in the present application and the features of the different embodiments or examples, unless they contradict each other.

[0118] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the representation of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0119] In order to clearly describe the present application, components irrelevant to the description are omitted, and the same reference symbols are given to the same or similar components throughout the specification.

[0120] Throughout the specification, when a device is said to be "connected" to another device, this includes not only the case of "direct connection" but also the case of "indirect connection" by placing other elements therebetween. In addition, when a device is said to "include" a certain component, unless otherwise stated, it does not exclude other components, but means that other components may be included.

[0121] When a device is said to be "on" another device, it may be directly on the other device, but there may also be other devices between it. In contrast, when a device is said to be "directly" on another device, there are no other devices between it.

[0122] Although the terms first, second, etc. are used to represent various elements in some examples, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, the first interface and the second interface, etc. are represented. Moreover, as used in this article, the singular forms "one", "one" and "the" are intended to also include plural forms, unless there is an opposite indication in the context. It should be further understood that the terms "comprising" and "including" indicate the existence of features, steps, operations, elements, components, projects, kinds, and / or groups, but do not exclude the existence, occurrence or addition of one or more other features, steps, operations, elements, components, projects, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Only when the combination of elements, functions, steps or operations is inherently mutually exclusive in some way, will there be an exception to this definition.

[0123] The technical terms used herein are only used to refer to specific embodiments and are not intended to limit the present application. The singular form used herein also includes the plural form unless the sentence clearly indicates the contrary meaning. The meaning of "including" used in the specification is to specify specific characteristics, regions, integers, steps, operations, elements and / or components, and does not exclude the existence or addition of other characteristics, regions, integers, steps, operations, elements and / or components.

[0124] Although not defined differently, all terms, including technical and scientific terms used herein, have the same meaning as those generally understood by those skilled in the art to which this application belongs. Terms defined in commonly used dictionaries are additionally interpreted as having meanings consistent with the relevant technical literature and the contents of the current disclosure, and unless defined, shall not be overly interpreted as ideal or very formal meanings.

[0125] like Figures 1 to 4The circuit sampling device in this embodiment is shown, including a single-chip microcomputer 1, a current sampling module 2, a voltage differential sampling module 3 and a voltage single-ended sampling module 4, the current sampling module 2, the voltage differential sampling module 3 and the voltage single-ended sampling module 4 are all electrically connected to the single-chip microcomputer 1; the current sampling module 2 includes a metering chip 201, the metering chip 201 is electrically connected to the single-chip microcomputer 1, and is used to output a digital signal of a current value; the voltage differential sampling module 3 includes a first operational amplifier circuit and a first regulating circuit electrically connected in sequence, and is used to output a continuous analog signal of a multi-channel AC voltage; the voltage single-ended sampling module 4 includes a second operational amplifier circuit and a second regulating circuit electrically connected in sequence, and is used to output a continuous analog signal of a single-channel AC voltage; at least one of the voltage differential sampling module 3 and the voltage single-ended sampling module 4 is multiple; the circuit sampling device also includes a first power supply 6, a second power supply 7 and a third power supply 8, the first power supply 6 and the third power supply 8 are both electrically connected to the voltage differential sampling module 3 and the voltage single-ended sampling module 4, and the second power supply 7 is electrically connected to the first regulating circuit and the second regulating circuit. Only current sampling uses one metering chip 201 for calculation, while multi-channel voltage sampling all uses the single-chip microcomputer 1 for calculation and processing, thereby greatly reducing the number of chips used in the circuit sampling device and reducing product costs; at the same time, when the single-chip microcomputer 1 is used to calculate the AC voltage, its anti-interference and load compatibility are relatively good, thereby ensuring product performance.

[0126] The current sampling module 2 includes a first resistor 202, a second resistor 203, a third resistor 204, a fourth resistor 205, a fifth resistor 206, a first capacitor 207, a second capacitor 208, a third capacitor 209 and a current transformer 210; the current transformer 210 includes a main coil 2101 and a secondary coil 2102, the two ends of the main coil 2101 are respectively connected to the first input end 211 and the output end 212, the first resistor 202 and the second resistor 203 are connected in parallel and are electrically connected to the two ends of the secondary coil 2102, one end of the third resistor 204 is electrically connected to the first resistor 202 and the second resistor 203, and the other end The fourth resistor 205 is electrically connected to the secondary coil 2102 of the current transformer 210 and the second pin 22 of the metering chip 201 respectively; the fifth resistor 206 is electrically connected to the secondary coil 2102 of the current transformer 210 and the fourth pin 24 of the metering chip 201 respectively; one end of the first capacitor 207 is electrically connected to the fifth resistor 206, and the other end is grounded; one end of the second capacitor 208 is electrically connected to the fourth resistor 205, and the other end is grounded; one end of the third capacitor 209 is electrically connected to the first power supply 6, and the other end is grounded; the first power supply 6 is electrically connected to the first pin 21 of the metering chip 201. After the AC current is sampled by the current transformer 210, it is converted into an AC voltage through multiple resistor voltage division and multiple capacitor filtering, and input into the metering chip 201, and its effective value is calculated by the metering chip 201.

[0127] A first node 213 is provided between the fifth resistor 206 and the fourth pin 24 of the metering chip 201, and the third pin 23 of the metering chip 201 is electrically connected to the first node 213. The metering chip 201 is usually used for both current sampling and voltage sampling. Connecting the third pin 23 and the fourth pin 24 of the metering chip 201 to the first node 213 allows the metering chip 201 to work normally when only processing current.

[0128] The current sampling module 2 also includes a sixth resistor 214, a seventh resistor 215 and a first output port 217; the fifth pin 25 of the metering chip 201 is grounded, and a second node 216 is provided between the fifth pin 25 of the metering chip 201 and the grounding point; the two ends of the sixth resistor 214 are electrically connected to the fifth pin 25 of the metering chip 201 and the seventh resistor 215, respectively, and the seventh resistor 215 is connected to the second node 216; a first output port 217 is provided between the sixth resistor 214 and the seventh resistor 215, and the first output port 217 is electrically connected to the single-chip computer 1. The sixth resistor 214 and the seventh resistor 215 are connected in series to prevent the electrical signal output by the metering chip 201 from being too strong, so as to avoid interfering with the output of the first output port 217.

[0129] The first operational amplifier circuit includes an eighth resistor 301, a ninth resistor 302, a first load resistor 303, a second load resistor 304 and a first operational amplifier 305; the two ends of the first load resistor 303 are electrically connected to the second input terminal 316 and the inverting pin of the first operational amplifier 305, respectively, and the two ends of the second load resistor 304 are electrically connected to the third input terminal 317 and the non-inverting pin of the first operational amplifier 305, respectively; one end of the eighth resistor 301 is connected to one end of the first load resistor 303 close to the first operational amplifier 305, and the other end is connected to the output pin of the first operational amplifier 305; one end of the ninth resistor 302 is connected to one end of the second load resistor 304 close to the first operational amplifier 305, and the other end is grounded; the first operational amplifier circuit also includes a fourth capacitor 306 and a fifth capacitor 307, the fourth capacitor 306 is connected in parallel with the eighth resistor 301, and the fifth capacitor 307 is connected in parallel with the ninth resistor 302; the first power supply 6 is electrically connected to the positive power supply pin of the first operational amplifier 305, and the third power supply 8 is electrically connected to the negative power supply pin of the first operational amplifier 305. For the second input terminal 316, the first load resistor 303 is a pull-up resistor, the ninth resistor 302 is a pull-down resistor, the ground line is divided by resistance, and the fifth capacitor 307 is decoupled and filtered to output to the inverting pin of the first operational amplifier 305; for the third input terminal 317, the second load resistor 304 is a pull-up resistor, the ninth resistor 302 is a pull-down resistor, the ground line is divided by resistance, and the fifth capacitor 307 is decoupled and filtered to output to the non-inverting pin of the first operational amplifier 305; at this time, the operational amplifier gain is 1, and the first operational amplifier circuit acts as a buffer for impedance matching to improve anti-interference capability.

[0130] In this embodiment, the first load resistor 303 and the second load resistor 304 are both multiple resistors connected in series. According to design requirements, in other embodiments, the first load resistor 303 and the second load resistor 304 can also be a single resistor with a larger resistance value.

[0131] In this embodiment, the first regulating circuit includes a first diode 308, a second diode 309, a third diode 310, a twelfth resistor 311, a thirteenth resistor 312, an eighth capacitor 313, a ninth capacitor 314 and a second output port 315; one end of the first diode 308 is electrically connected to the output pin of the first operational amplifier 305, and the other end is connected in series with the twelfth resistor 311, the thirteenth resistor 312, the second diode 309, the third diode 310 and the second power supply 7 in sequence, the eighth capacitor 313 is connected in parallel with the thirteenth resistor 312 and forms a first parallel unit connected in series with the twelfth resistor 311, the ninth capacitor 314 is connected in parallel with the twelfth resistor 311 and the first parallel unit, and the end of the third diode 310 away from the second power supply 7 is provided with a second output port 315 electrically connected to the single-chip computer 1. The signal output by the first operational amplifier 305 is half-wave rectified by the first diode 308, and then second-order filtered by the twelfth resistor 311, the thirteenth resistor 312, the eighth capacitor 313 and the ninth capacitor 314 to form a DC voltage, which is output to the microcontroller 1 through the second output port 315 and the voltage is calculated.

[0132] The second operational amplifier circuit includes a tenth resistor 401, an eleventh resistor 402, a third load resistor 403 and a second operational amplifier 404; two ends of the third load resistor 403 are electrically connected to the fourth input terminal 405 and the non-inverting pin of the second operational amplifier 404 respectively, one end of the tenth resistor 401 is connected to the inverting pin of the second operational amplifier 404, and the other end is connected to the output pin of the second operational amplifier 404; one end of the eleventh resistor 402 is connected to one end of the third load resistor 403 close to the second operational amplifier 404, and the other end is grounded; the second operational amplifier circuit also includes a sixth capacitor 406 and a seventh capacitor 407, the sixth capacitor 406 is connected in parallel with the tenth resistor 401, and the seventh capacitor 407 is connected in parallel with the eleventh resistor 402; the first power supply 6 is electrically connected to the positive power supply pin of the second operational amplifier 404, and the third power supply 8 is electrically connected to the negative power supply pin of the second operational amplifier 404. For the fourth input terminal 405, the third load resistor 403 is a pull-up resistor, the eleventh resistor 402 is a pull-down resistor, the ground line is divided by resistance, and the seventh capacitor 407 is decoupled and filtered and output to the non-inverting pin of the second operational amplifier 404. At this time, the operational amplifier gain is 1, and the second operational amplifier circuit is used as a buffer for impedance matching, thereby improving the anti-interference ability.

[0133] In this embodiment, the third load resistor 403 is a plurality of resistors connected in series. According to design requirements, in other embodiments, the third load resistor 403 may also be a single resistor with a larger resistance.

[0134] In this embodiment, the second regulating circuit includes a fourth diode 408, a fifth diode 409, a sixth diode 410, a fourteenth resistor 411, a fifteenth resistor 412, a tenth capacitor 413, an eleventh capacitor 414 and a third output port 415; one end of the fourth diode 408 is electrically connected to the output pin of the second operational amplifier 404, and the other end is connected in series with the fourteenth resistor 411, the fifteenth resistor 412, the fifth diode 409, the sixth diode 410 and the second power supply 7 in sequence, the tenth capacitor 413 is connected in parallel with the fifteenth resistor 412 and forms a second parallel unit connected in series with the fourteenth resistor 411, the eleventh capacitor 414 is connected in parallel with the fourteenth resistor 411 and the second parallel unit, and the end of the sixth diode 410 away from the second power supply 7 is provided with a third output port 415 electrically connected to the single-chip computer 1. The signal output by the second operational amplifier 404 is half-wave rectified by the fourth diode 408, and then second-order filtered by the fourteenth resistor 411, the fifteenth resistor 412, the tenth capacitor 413, and the eleventh capacitor 414 to form a DC voltage, which is output to the single chip computer 1 through the third output port 415 and the voltage is calculated.

[0135] The circuit sampling device further comprises a display module 5, which is electrically connected to the single chip computer 1 and is used to display the operation result of the single chip computer 1. The display module 5 displays the processing result of the single chip computer 1, so as to facilitate the use of the operator.

[0136] like Figure 5 As shown, the voltage waveform of the input end of the voltage differential sampling module 3 and the voltage single-ended sampling module 4 is curve A, that is, 50Hz AC with a peak value of 220V. At this time, the voltage waveform of the output port of the voltage differential sampling module 3 and the voltage single-ended sampling module 4 is curve B, that is, after starting to work for a period of time, it stabilizes to 2.6V DC.

[0137] The utility model also provides a charging pile, comprising the circuit sampling device as described in any one of the above items. The charging pile uses the circuit sampling device to reduce product costs and ensure the accuracy of detection.

[0138] In summary, the purpose of the present invention is to provide a circuit sampling device and a charging pile including the same, so as to reduce the number of processing elements required for circuit sampling and reduce the cost of the product.

[0139] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A circuit sampling device, characterized in that: It comprises a single-chip computer (1), a current sampling module (2), a voltage differential sampling module (3) and a voltage single-ended sampling module (4), wherein the current sampling module (2), the voltage differential sampling module (3) and the voltage single-ended sampling module (4) are all electrically connected to the single-chip computer (1); The current sampling module (2) comprises a metering chip (201), wherein the metering chip (201) is electrically connected to the single-chip computer (1) and is used to output a digital signal of a current value; The voltage differential sampling module (3) comprises a first operational amplifier circuit and a first regulating circuit which are electrically connected in sequence, and are used to output continuous analog signals of multiple AC voltages; the voltage single-ended sampling module (4) comprises a second operational amplifier circuit and a second regulating circuit which are electrically connected in sequence, and are used to output continuous analog signals of single AC voltages; at least one of the voltage differential sampling module (3) and the voltage single-ended sampling module (4) is in plurality; The circuit sampling device further comprises a first power supply (6), a second power supply (7) and a third power supply (8), wherein the first power supply (6) and the third power supply (8) are both electrically connected to the voltage differential sampling module (3) and the voltage single-ended sampling module (4), and the second power supply (7) is electrically connected to the first regulating circuit and the second regulating circuit.

2. The sampling device according to claim 1, characterized in that: The current sampling module (2) comprises a first resistor (202), a second resistor (203), a third resistor (204), a fourth resistor (205), a fifth resistor (206), a first capacitor (207), a second capacitor (208), a third capacitor (209) and a current transformer (210); The current transformer (210) comprises a main coil (2101) and a secondary coil (2102); two ends of the main coil (2101) are respectively connected to a first input end (211) and an output end (212); the first resistor (202) and the second resistor (203) are connected in parallel and are electrically connected to two ends of the secondary coil (2102); one end of the third resistor (204) is electrically connected to the first resistor (202) and the second resistor (203), and the other end is grounded; two ends of the fourth resistor (205) are respectively electrically connected to the secondary coil (2102) of the current transformer (210) and a second pin (22) of the metering chip (201); and two ends of the fifth resistor (206) are respectively electrically connected to the secondary coil (2102) of the current transformer (210) and a fourth pin (24) of the metering chip (201); One end of the first capacitor (207) is electrically connected to the fifth resistor (206), and the other end is grounded; one end of the second capacitor (208) is electrically connected to the fourth resistor (205), and the other end is grounded; one end of the third capacitor (209) is electrically connected to the first power source (6), and the other end is grounded; the first power source (6) is electrically connected to the first pin (21) of the metering chip (201).

3. The sampling device according to claim 2, characterized in that: A first node (213) is provided between the fifth resistor (206) and the fourth pin (24) of the metering chip (201), and the third pin (23) of the metering chip (201) is electrically connected to the first node (213).

4. The sampling device according to claim 2, characterized in that: The current sampling module (2) further comprises a sixth resistor (214), a seventh resistor (215) and a first output port (217); the fifth pin (25) of the metering chip (201) is grounded, and a second node (216) is provided between the fifth pin (25) of the metering chip (201) and the grounding point; two ends of the sixth resistor (214) are electrically connected to the fifth pin (25) of the metering chip (201) and the seventh resistor (215) respectively, and the seventh resistor (215) is connected to the second node (216); a first output port (217) is provided between the sixth resistor (214) and the seventh resistor (215), and the first output port (217) is electrically connected to the single chip computer (1).

5. The sampling device according to claim 1, characterized in that: The first operational amplifier circuit comprises an eighth resistor (301), a ninth resistor (302), a first load resistor (303), a second load resistor (304) and a first operational amplifier (305); two ends of the first load resistor (303) are electrically connected to a second input terminal (316) and an inverting pin of the first operational amplifier (305) respectively, and two ends of the second load resistor (304) are electrically connected to a third input terminal (317) and a non-inverting pin of the first operational amplifier (305) respectively; One end of the eighth resistor (301) is connected to one end of the first load resistor (303) close to the first operational amplifier (305), and the other end is connected to the output pin of the first operational amplifier (305); one end of the ninth resistor (302) is connected to one end of the second load resistor (304) close to the first operational amplifier (305), and the other end is grounded; The first operational amplifier circuit further comprises a fourth capacitor (306) and a fifth capacitor (307), the fourth capacitor (306) being connected in parallel with the eighth resistor (301), and the fifth capacitor (307) being connected in parallel with the ninth resistor (302); the first power supply (6) being electrically connected to the positive power supply pin of the first operational amplifier (305), and the third power supply (8) being electrically connected to the negative power supply pin of the first operational amplifier (305).

6. The sampling device according to claim 5, characterized in that: The first regulating circuit comprises a first diode (308), a second diode (309), a third diode (310), a twelfth resistor (311), a thirteenth resistor (312), an eighth capacitor (313), a ninth capacitor (314) and a second output port (315); one end of the first diode (308) is electrically connected to the output pin of the first operational amplifier (305), and the other end is connected in series with the twelfth resistor (311), the thirteenth resistor (312), the second diode (309), the third diode (310) and the second power supply (7) in sequence; the eighth capacitor (313) is connected in parallel with the thirteenth resistor (312) to form a first parallel unit connected in series with the twelfth resistor (311); the ninth capacitor (314) is connected in parallel with the twelfth resistor (311) and the first parallel unit; and the end of the third diode (310) away from the second power supply (7) is provided with a second output port (315) electrically connected to the single chip computer (1).

7. The sampling device according to claim 1, characterized in that: The second operational amplifier circuit comprises a tenth resistor (401), an eleventh resistor (402), a third load resistor (403) and a second operational amplifier (404); two ends of the third load resistor (403) are electrically connected to a fourth input terminal (405) and a non-inverting pin of the second operational amplifier (404) respectively; one end of the tenth resistor (401) is connected to an inverting pin of the second operational amplifier (404), and the other end is connected to an output pin of the second operational amplifier (404); one end of the eleventh resistor (402) is connected to one end of the third load resistor (403) close to the second operational amplifier (404), and the other end is grounded; The second operational amplifier circuit further comprises a sixth capacitor (406) and a seventh capacitor (407), the sixth capacitor (406) being connected in parallel with the tenth resistor (401), and the seventh capacitor (407) being connected in parallel with the eleventh resistor (402); the first power supply (6) being electrically connected to the positive power supply pin of the second operational amplifier (404), and the third power supply (8) being electrically connected to the negative power supply pin of the second operational amplifier (404).

8. The sampling device according to claim 7, characterized in that: The second regulating circuit comprises a fourth diode (408), a fifth diode (409), a sixth diode (410), a fourteenth resistor (411), a fifteenth resistor (412), a tenth capacitor (413), an eleventh capacitor (414) and a third output port (415); one end of the fourth diode (408) is electrically connected to the output pin of the second operational amplifier (404), and the other end is connected in series with the fourteenth resistor (411), the fifteenth resistor (412), the fifth diode (409), the sixth diode (410) and the second power supply (7) in sequence; the tenth capacitor (413) is connected in parallel with the fifteenth resistor (412) to form a second parallel unit connected in series with the fourteenth resistor (411); the eleventh capacitor (414) is connected in parallel with the fourteenth resistor (411) and the second parallel unit; and the sixth diode (410) is provided with a third output port (415) electrically connected to the single chip computer (1) at one end away from the second power supply (7).

9. The sampling device according to claim 1, characterized in that: The circuit sampling device further comprises a display module (5), wherein the display module (5) is electrically connected to the single chip computer (1) and is used for displaying the calculation result of the single chip computer (1).

10. A charging pile, characterized in that: It comprises the circuit sampling device as claimed in any one of claims 1 to 9.

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