Range self-adaptive acquisition circuit and measuring device of direct-current voltage divider

Abstract

The invention relates to a measuring range self-adaptive acquisition circuit and a measuring device of a direct current voltage divider, and relates to the technical field of signal measurement, the circuit comprises a plurality of signal measurement loops, the input end of each signal measurement loop is used for being connected with a direct current voltage divider to be acquired, and the input end of each signal measurement loop is used for being connected with the direct current voltage divider to be acquired; the output end of each signal measurement loop is used for being connected with a processing circuit; and different signal measurement loops have different break-over voltage ranges. In the circuit, the mode of controlling the conduction of the signal measurement loops is realized by triggering the conduction of each signal measurement loop through an input voltage signal output by the direct current voltage divider, and the switching of the measuring range is realized without adopting a relay; and the problems that components are damaged and the service life of the measuring circuit is shortened due to frequent switching of the relay are avoided.

Description

Technical Field

[0001] The present application relates to the technical field of signal measurement, and in particular to a range adaptive acquisition circuit and a measuring device for a DC voltage divider. Background Art

[0002] Since the output signal range of the DC voltage divider is different, different measurement circuits are required to measure the signal and then pass it to the background analysis. At present, the measurement device has high measurement accuracy only in a part of the accuracy range, and the remaining accuracy cannot be guaranteed. When actually measuring high-voltage lines, if a measurement device with a wide measurement range is used, the measurement accuracy cannot ensure full-range measurement. In order to solve the problem of difficult to ensure accuracy, the related technology uses relays to switch the measurement range according to the size of different measurement signals to ensure the accuracy of the measurement signal. However, the range switching will cause the relay to operate frequently, thereby reducing the service life of the measuring device. Summary of the invention

[0003] Based on this, it is necessary to provide a range adaptive acquisition circuit and a measuring device for a DC voltage divider that can extend the life of the measuring device in order to solve the above technical problems.

[0004] In a first aspect, the present application provides a range adaptive acquisition circuit for a DC voltage divider, comprising:

[0005] A plurality of signal measurement loops, wherein the input end of each of the signal measurement loops is used to connect to a DC voltage divider to be collected, and the output end of each of the signal measurement loops is used to connect to a processing circuit;

[0006] Among them, different signal measurement loops have different conduction voltage ranges.

[0007] In one embodiment, the plurality of signal measurement loops include:

[0008] At least one first-type measurement loop, the first-type measurement loop having a first end and a second end, and a plurality of series resistors connected in series between the first end and the second end, the first end of the first-type measurement loop being used to connect the DC voltage divider to be collected, and the second end of the first-type measurement loop being used to connect the processing circuit;

[0009] At least one second type measurement loop, the second type measurement loop having a first end and a second end, and a switch tube and a plurality of series resistors connected in series between the first end and the second end, the first end of the second type measurement loop being used to connect the DC voltage divider to be collected, and the second end of the second type measurement loop being used to connect the processing circuit;

[0010] Wherein, the controlled ends of the switch tubes in different second-type measurement loops are respectively connected to different series resistors in the first-type measurement loop.

[0011] In one embodiment, the second type of measurement loop further includes:

[0012] A clamping capacitor, wherein a first end of the clamping capacitor is used to connect the DC voltage divider to be collected and a first end of the first type of measurement loop, respectively, and the other end of the clamping capacitor is used to connect a controlled end of the switch tube and different series resistors of the first type of measurement loop, respectively;

[0013] The plurality of series resistors of the second type of measurement loop include:

[0014] A measuring resistor, one end of which is used to connect to the collector of the switching tube, and the other end of which is used to connect to the processing circuit;

[0015] An emitter resistor, one end of which is used to connect to the emitter of the switch tube, and the other end of which is used to connect to different series resistors of the first type of measurement loop.

[0016] In one embodiment, the plurality of series resistors of the second type of measurement loop further include:

[0017] A current limiting resistor, one end of which is used to connect to the DC voltage divider to be collected, and the other end of which is used to connect to the emitter of the switching tube.

[0018] In one of the embodiments, the measuring resistor is a high-precision sampling resistor.

[0019] In one embodiment, the circuit described in any one of the above embodiments further includes: a filter circuit, the input end of the filter circuit is used to connect to the DC voltage divider to be collected, and the output end of the filter circuit is respectively connected to the input end of each of the signal measurement loops.

[0020] In one embodiment, the sizes of the corresponding ranges of the plurality of signal measurement loops are arranged in ascending order.

[0021] In a second aspect, the present application provides a range adaptive measurement device for a DC voltage divider, comprising:

[0022] A range adaptive acquisition circuit for a DC voltage divider as described in any one of the above embodiments;

[0023] A processing circuit, wherein the input end of the processing circuit is connected to the output end of the range adaptive acquisition circuit of the DC voltage divider.

[0024] In one embodiment, the processing circuit comprises:

[0025] A data conversion circuit, connected to the range adaptive acquisition circuit of the DC voltage divider, for acquiring the first output signal of the DC voltage divider to be acquired;

[0026] The processor is respectively connected to the range adaptive acquisition circuit of the DC voltage divider and the data conversion circuit, and is used to obtain a first output signal of the output signal of the DC voltage divider to be collected and a second output signal of the range adaptive acquisition circuit of the DC voltage divider, and to sample the first output signal and the second output signal respectively to obtain a first measurement signal and a second measurement signal; the first measurement signal and the second measurement signal are used to be sent to a back-end computer device.

[0027] In one embodiment, the device further comprises:

[0028] A TDM protocol logic circuit is connected to the processor, and is used to receive the first measurement signal and the second measurement signal, and compare the first measurement signal with the second measurement signal, and when the difference between the first measurement signal and the second measurement signal satisfies a preset error range, send the first measurement signal or the second measurement signal to the back-end computer device in the form of a TDM protocol.

[0029] The above-mentioned DC voltage divider has a range adaptive acquisition circuit and a measuring device, and the circuit includes a plurality of signal measurement loops, the input end of each signal measurement loop is used to connect the DC voltage divider to be collected, and the output end of each signal measurement loop is used to connect the processing circuit to perform subsequent processing and analysis on the voltage signal collected by each signal measurement loop. Among them, different signal measurement loops have different conduction voltage ranges, so that different signal measurement loops are adaptively turned on according to the voltage signals of different ranges output by the DC voltage divider to adjust the range of the voltage signal. The measurement requirements of the output signal of the DC voltage divider are met. The way to control the conduction of the signal measurement loop is to trigger the conduction of each signal measurement loop by the voltage signal output by the input DC voltage divider. There is no need to use relays to achieve the switching of the range, which avoids the problem of damage to components and reduced life of the measurement circuit due to frequent switching of relays. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] FIG1 is a schematic diagram of the structure of a range adaptive acquisition circuit for a DC voltage divider in one embodiment;

[0032] FIG2 is a schematic diagram of the structure of a range adaptive acquisition circuit of a DC voltage divider in another embodiment;

[0033] FIG3 is a schematic diagram of the structure of a second type of measurement circuit in one embodiment;

[0034] FIG4 is a schematic diagram of the structure of a range adaptive acquisition circuit of a DC voltage divider in another embodiment;

[0035] FIG5 is a schematic diagram of the structure of a range adaptive measurement device for a DC voltage divider in one embodiment;

[0036] FIG6 is a schematic diagram of the structure of a range adaptive measuring device for a DC voltage divider in another embodiment. DETAILED DESCRIPTION

[0037] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0039] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0040] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0041] It can be understood that “at least one” means one or more, “plurality” means two or more, and “at least part of an element” means part or all of an element.

[0042] When used herein, the singular forms "a", "an" and " / the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0043] In the related art, the measurement system of the DC voltage divider deployed in the back-end computer equipment includes a DC shunt, a DC voltage divider, an OPTO52 sensor head, and an LO5 module, wherein the basic device of the DC current measuring device is a parallel resistor installed on the current channel. A voltage proportional to the DC current is applied to the sensor head (OPTO52) through a shielded cable, and the sensor head is located in the sensor box. The voltage signal is converted into an optical digital signal in a laser-powered photoelectric sensor (OPTO52). In the sensor head box, the photoelectric sensor is connected to the optical cable. The signal is transmitted to the ground optical cable through this section of optical cable, and these optical fibers are coated in silicone rubber composite insulators. In the junction box, the optical fiber coming out of the optical fiber sensor head (OPTO52) is connected to the underground cable and transmitted to the corresponding measurement panel cabinet. The measurement of DC voltage is achieved by using a resistive voltage divider. Each resistive voltage divider is equipped with a secondary terminal box containing an OPTO52 sensor head for a redundant measurement system. The OPTO52 sensor is a reliable optical sensor that converts analog input signals into optical digital output signals. The OPTO52 sensor is used in high-voltage systems to measure high-level voltages, but the sensor itself does not have any direct electrical connection to the secondary equipment at the ground potential. Therefore, it is easy to meet the high-voltage insulation requirements. The energy required for the analog / digital conversion module to work is provided by a Class 4 laser from the ground potential level. The photoelectric conversion power supply module in the OPTO52 sensor converts light energy into electrical energy. The sensor uses this electrical energy to digitize the output signal and then transmits it to the receiver at the ground potential level as an optical signal. OPTO52 includes a monitoring function for the energy conversion output. If the output decreases below a certain value, OPTO52 will transmit this state to the ground unit, thereby enhancing the optical signal to correct the output. OPTO52 includes a monitoring function for the energy conversion output. If the output decreases below a certain value, OPTO52 will transmit this state to the ground unit, thereby enhancing the optical signal to correct the output. The LO5 module is located in the TDC (a digital control system of Siemens) rack (panel cabinet) and is used to receive the digital optical signal transmitted by OPTO52, and after pre-processing the received optical signal, the TDM bus sends it to the corresponding control and protection equipment. The LO5 module consists of the LO5-D module and the LO5-M module. The LO5-D module is responsible for the emission of energy lasers and the collection of optical measurement signals. The LO5-M module is responsible for the pre-processing of collected data and the transmission of data through the TDM bus. The LO5 module not only has an optical signal output port for optical transmission through the TDM (Time Division Multiplexing) bus, but also an electrical analog signal output port for use by a measuring device that only receives electrical signals. The measuring device is set near the DC voltage divider.The inventor of the present application has found that the measuring range accuracy of the measuring device is insufficient through research and analysis. Since the output signal range of the DC voltage divider is different, if the measuring range is to be changed, it is necessary to switch to the redundant measuring system through the relay. However, frequent switching of the relay will cause damage to the components, thereby reducing the service life of the measuring device. In addition, the measuring device in the related art does not support direct communication with the Siemens measurement system. For this reason, the inventor of the present application has proposed a range adaptive acquisition circuit for the DC voltage divider.

[0044] In an exemplary embodiment, referring to FIG1 , a range adaptive acquisition circuit of a DC voltage divider is provided, comprising:

[0045] There are multiple signal measurement loops 100, and the input end of each signal measurement loop 100 is used to connect to the DC voltage divider to be collected, and the output end of each signal measurement loop 100 is used to connect to the processing circuit to perform subsequent processing and analysis on the voltage signal collected by each signal measurement loop 100.

[0046] Different signal measurement loops 100 have different conduction voltage ranges, so that different signal measurement loops 100 are adaptively conducted according to voltage signals of different ranges output by the DC voltage divider to adjust the range of the voltage signal and meet the measurement requirements of the output signal of the DC voltage divider.

[0047] It should be noted that the conduction of the control signal measurement circuit 100 in this embodiment is achieved by triggering the conduction of the switch tubes of each signal measurement circuit 100 through the voltage signal output by the input DC voltage divider. There is no need to use relays to switch the range, which avoids the problem of component damage and reduced life of the measurement circuit due to frequent switching of relays.

[0048] It can be understood that the above-mentioned method of controlling the conduction of each signal measurement loop 100 can also be implemented by adopting a multi-way analog switch, a multi-channel analog-to-digital converter, or a digital signal processing algorithm, such as adaptive gain control and filtering algorithm to dynamically adjust the measurement range of the measurement loop, and is not limited to the form already mentioned in this embodiment, as long as it can complete the function of adaptive switching of the range of the signal measurement loop 100.

[0049] In an exemplary embodiment, referring to FIG. 2 , a plurality of signal measurement loops 100 include:

[0050] At least one first type measuring loop 101 and at least one second type measuring loop 102 .

[0051] Among them, the first type of measurement loop 101 has a first end and a second end, and a plurality of series resistors 1011 connected in series between the first end and the second end. The first end of the first type of measurement loop 101 is used to connect the DC voltage divider to be collected, and the second end of the first type of measurement loop 101 is used to connect the processing circuit; the second type of measurement loop 102 has a first end and a second end, and a switch tube 1022 and a plurality of series resistors 1021 connected in series between the first end and the second end. The first end of the second type of measurement loop 102 is used to connect the DC voltage divider to be collected, and the second end of the second type of measurement loop 102 is used to connect the processing circuit.

[0052] The controlled ends of the switch tubes in different second-type measurement loops 102 are respectively connected to different series resistors 1011 in the first-type measurement loop 101 .

[0053] It can be understood that the functions of the multiple series resistors 1011 of the first type of measurement loop 101 are voltage division and current limiting. By selecting the appropriate resistance value of each series resistor 1011 in advance according to the actual measurement requirements, the series resistor 1011 can reduce the input high voltage signal to a measurable range to protect the subsequent circuit or measurement equipment. The main function of the first type of measurement loop 101 is to realize voltage division through the series resistor 1011, reduce the high voltage signal obtained from the DC voltage divider, and make it suitable for the input requirements of the subsequent processing circuit. The value of each resistor can be selected as needed to achieve the required output voltage. The main function of the second type of measurement loop 102 is to select different resistance paths by opening and closing the switch tube. By controlling the switch tube, the current path can be switched instantaneously, thereby selectively measuring different resistance values. Because different resistances can correspond to different measurement requirements, this capability can be used to meet the measurement of voltage signals in different ranges. Through a simple control mechanism, the system can flexibly respond to different measurement requirements and realize adaptive range switching, thereby reducing the complexity of the range adaptive acquisition circuit of the DC voltage divider, improving flexibility and extending the life of the circuit. In addition, the circuit structure is simple, which is convenient for replacement and maintenance of parts, has strong reproducibility, and reduces costs.

[0054] Exemplarily, according to the connection relationship between each first-category measurement loop 101 and each second-category measurement loop 102, and the flow order of the voltage signal of the DC voltage divider, the sizes of the corresponding ranges of the multiple signal measurement loops 100 are sorted in ascending order, so that the range adaptive acquisition circuit of the DC voltage divider adaptively turns on the second-category measurement loop 102 according to the size of the voltage signal of the DC voltage divider to adjust different ranges.

[0055] In an exemplary embodiment, referring to FIG. 3 , the second type measurement loop 102 further includes:

[0056] A clamping capacitor 1023, wherein the first end of the clamping capacitor 1023 is respectively used to connect the DC voltage divider to be collected and the first end of the first type of measurement loop 101, and the other end of the clamping capacitor 1023 is respectively used to connect the controlled end of the switch tube and different series resistors of the first type of measurement loop 101.

[0057] The plurality of series resistors 1021 of the second type measurement loop 102 include a measurement resistor 1024 and an emitter resistor 1025 .

[0058] Among them, one end of the measuring resistor 1024 is used to connect the collector of the switching tube, and the other end of the measuring resistor 1024 is used to connect the processing circuit; one end of the emitter resistor 1025 is used to connect the emitter of the switching tube, and the other end of the emitter resistor 1025 is used to connect different series resistors of the first type of measurement loop 101.

[0059] It should be noted that the function of the clamping capacitor 1023 is to clamp the high voltage signal of the DC voltage divider, thereby preventing excessive transient voltage from harming other circuit components. When the signal input to the second type of measurement loop 102 exceeds a specific voltage threshold, the clamping capacitor 1023 can quickly absorb excess energy and stabilize it within a safe range, allowing a specific signal to pass smoothly without affecting the normal measurement of the signal. In addition, the measuring resistor 1024 is used to accurately measure the voltage signal flowing through the circuit. A high-precision sampling resistor can be used. It is a key component for realizing voltage division and signal acquisition. By measuring the voltage drop of the resistor 1024, the current or voltage can be reversely calculated by Ohm's law. The setting of the emitter resistor 1025 is mainly used for voltage stabilization and current regulation, ensuring that the switch tube works in a suitable state and ensuring the complete transmission of the signal. The measuring resistor 1024 acts as a current regulator in the emitter path of the switch tube. The emitter resistor 1025 affects the working state and gain characteristics of the switch tube, helps to achieve more accurate switching operation, and enhances the stability of the signal when the high frequency or fast signal changes. After the voltage signal provided by the DC voltage divider passes through the first type of measurement loop 101, if the voltage signal value is large, it is transmitted to the controlled end of the switch tube through the clamping capacitor 1023 of the second type of measurement loop 102, and is connected to multiple series resistors of the first type of measurement loop 101. The switch tube controls the flow of the voltage signal and realizes selective measurement of the signal through different resistance paths. The clamping capacitor 1023 provides protection for the input signal, so that the circuit can remain stable even under changing signal conditions. The switch tube flexibly changes the measurement range by selecting different series resistor combinations to adapt to different measurement requirements. The presence of the emitter resistor 1025 ensures that the switch tube can maintain a stable current flow in all working states, thereby ensuring the measurement accuracy and response speed of the entire circuit and the reliability of the measurement results.

[0060] In an exemplary embodiment, referring to FIG. 3 , the plurality of series resistors 1021 of the second type measurement loop 102 further include:

[0061] Current limiting resistor 1026, one end of the current limiting resistor 1026 is used to connect to the DC voltage divider to be collected, and the other end of the current limiting resistor 1026 is used to connect to the emitter of the switching tube, which can ensure that the current limiting resistor 1026 plays a role in the path of voltage signal transmission. Its main function is to limit the current flowing through the circuit. By pre-setting a suitable resistance value, it ensures that the current does not exceed a certain safety level, preventing other circuit components such as the switching tube and the measuring resistor 1024 from being damaged due to excessive current, thereby further extending the life of the range adaptive acquisition circuit of the DC voltage divider.

[0062] In an exemplary embodiment, referring to FIG. 4 , the range adaptive acquisition circuit of the DC voltage divider described in any one of the above embodiments further includes:

[0063] The filter circuit 110 has an input end connected to a DC voltage divider to be collected, and an output end of the filter circuit 110 is connected to an input end of each signal measurement loop 100 .

[0064] It should be noted that the filter circuit 110 may include a filter capacitor, which can filter out the high-frequency part of the signal. On the other hand, the voltage signal output by the DC voltage divider can be preliminarily analyzed based on the port voltage of the filter circuit 110 to provide data support for the component configuration of the subsequent circuit design.

[0065] In an exemplary embodiment, referring to FIG5 , a range adaptive measurement device for a DC voltage divider is provided, comprising:

[0066] As described in any one of the above embodiments, the range adaptive acquisition circuit 210 and the processing circuit 220 of the DC voltage divider, the input end of the processing circuit 220 is connected to the output end of the range adaptive acquisition circuit 210 of the DC voltage divider.

[0067] Exemplarily, the processing circuit 220 can perform signal acquisition and conversion on the measurement signal of the DC voltage divider output by the DC voltage divider range adaptive acquisition circuit 210, such as signal amplification, signal filtering and other conversion processing. In addition, the measurement signal can be converted into analog-to-digital and a specific data processing algorithm can be used to obtain more accurate and useful information from the signal output by the DC voltage divider range adaptive acquisition circuit 210. The processing circuit 220 can also send the processed and analyzed signal to the background for monitoring by technical personnel.

[0068] In an exemplary embodiment, referring to FIG. 6 , the processing circuit 220 includes:

[0069] Data conversion circuit 221 and processor 222 .

[0070] Among them, the data conversion circuit 221 is connected to the range adaptive acquisition circuit 210 of the DC voltage divider, and is used to obtain the first output signal of the DC voltage divider to be collected; the processor 222 is respectively connected to the range adaptive acquisition circuit 210 of the DC voltage divider and the data conversion circuit 221, and is used to obtain the first output signal of the output signal of the DC voltage divider to be collected and the second output signal of the range adaptive acquisition circuit 210 of the DC voltage divider, and samples the first output signal and the second output signal respectively to obtain the first measurement signal and the second measurement signal; the first measurement signal and the second measurement signal are used to be sent to the back-end computer device.

[0071] It should be noted that the range adaptive measurement device of the DC voltage divider can be a remote module deployed near the DC voltage divider, and the back-end computer equipment can be a terminal or a server. The terminal can be a personal computer, notebook and other devices. The server can be a server cluster or a server supporting cloud computing. The range adaptive measurement device of the DC voltage divider and the back-end computer equipment use wireless communication.

[0072] Exemplarily, the data conversion circuit 221 is responsible for performing preliminary decomposition and filtering processing on the preliminary measurement signal obtained after the DC voltage divider to be collected is measured by the DC voltage divider range adaptive acquisition circuit 210, obtaining a first output signal, and sending the first output signal to the processor 222. The processor 222 is responsible for analyzing and processing the first output signal and the second output signal, generating a master clock logic and a technical flag, and obtaining a first measurement signal and a second measurement signal. The data conversion circuit 221 and the processor 222 both sample the output signal of the DC voltage divider range adaptive acquisition circuit 210, which can improve the redundancy of the device, avoid the signal processed by one of them being abnormal, and causing the subsequent final measurement signal to be an abnormal signal and unable to be used, and can improve the accuracy of the measurement signal.

[0073] In an exemplary embodiment, referring to FIG6 , the range adaptive measurement device for a DC voltage divider further includes:

[0074] TDM protocol logic circuit 223, TDM protocol logic circuit 223 is connected to processor 222, TDM protocol logic circuit 223 is used to receive the first measurement signal and the second measurement signal, and compare the first measurement signal and the second measurement signal, and when the difference between the first measurement signal and the second measurement signal satisfies a preset error range, send the first measurement signal or the second measurement signal to the back-end computer device in the form of TDM protocol.

[0075] Among them, TDM is a digital control system of Siemens that supports the TDM protocol. When the difference between the first measurement signal and the second measurement signal satisfies the preset error range, the TDM protocol logic circuit 223 sends the first measurement signal or the second measurement signal to the back-end computer device in the form of the TDM protocol, so as to realize direct communication with the Siemens measurement system deployed on the back-end computer device, so that the DC voltage divider measurement systems of different manufacturers can adapt to the Siemens measurement system without the aid of other equipment, allowing the back-end computer device to perform subsequent analysis and processing on the measurement signal.

[0076] In addition, the TDM protocol logic circuit 223 can further improve the accuracy of the measurement data and the redundancy of the range adaptive measurement device of the entire DC voltage divider by comparing the difference between the first measurement signal and the second measurement signal and sending the measurement signal to the back-end computer device only when the difference is lower than the preset error range.

[0077] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example.

[0078] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0079] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A range adaptive acquisition circuit for a DC voltage divider, characterized in that: include: A plurality of signal measurement loops, wherein the input end of each of the signal measurement loops is used to connect to a DC voltage divider to be collected, and the output end of each of the signal measurement loops is used to connect to a processing circuit; Among them, different signal measurement loops have different conduction voltage ranges.

2. The circuit according to claim 1, characterized in that The plurality of signal measurement loops include: At least one first-type measurement loop, the first-type measurement loop having a first end and a second end, and a plurality of series resistors connected in series between the first end and the second end, the first end of the first-type measurement loop being used to connect the DC voltage divider to be collected, and the second end of the first-type measurement loop being used to connect the processing circuit; At least one second-type measurement loop, the second-type measurement loop having a first end and a second end, and a switch tube and a plurality of series resistors connected in series between the first end and the second end, the first end of the second-type measurement loop being used to connect the DC voltage divider to be collected, and the second end of the second-type measurement loop being used to connect the processing circuit; Wherein, the controlled ends of the switch tubes in different second-type measurement loops are respectively connected to different series resistors in the first-type measurement loop.

3. The circuit according to claim 2, characterized in that The second type of measurement circuit also includes: A clamping capacitor, wherein a first end of the clamping capacitor is used to connect the DC voltage divider to be collected and a first end of the first type of measurement loop, respectively, and the other end of the clamping capacitor is used to connect a controlled end of the switch tube and different series resistors of the first type of measurement loop, respectively; The plurality of series resistors of the second type of measurement loop include: A measuring resistor, one end of which is used to connect to the collector of the switching tube, and the other end of which is used to connect to the processing circuit; An emitter resistor, one end of which is used to connect to the emitter of the switch tube, and the other end of which is used to connect to different series resistors of the first type of measurement loop.

4. The circuit according to claim 3, characterized in that The plurality of series resistors of the second type of measurement loop also include: A current limiting resistor, one end of which is used to connect to the DC voltage divider to be collected, and the other end of which is used to connect to the emitter of the switching tube.

5. The circuit according to claim 4, characterized in that The measuring resistor is a high-precision sampling resistor.

6. The circuit according to any one of claims 1 to 5, characterized in that: Also includes: A filter circuit, wherein the input end of the filter circuit is used to connect to the DC voltage divider to be collected, and the output end of the filter circuit is respectively connected to the input end of each of the signal measurement loops.

7. The circuit according to any one of claims 1 to 5, characterized in that: The sizes of the measurement ranges corresponding to the plurality of signal measurement loops are arranged in ascending order.

8. A range adaptive measuring device for a DC voltage divider, characterized in that: include: The range adaptive acquisition circuit of the DC voltage divider according to any one of claims 1 to 7; A processing circuit, wherein the input end of the processing circuit is connected to the output end of the range adaptive acquisition circuit of the DC voltage divider.

9. The device according to claim 8, characterized in that The processing circuit comprises: A data conversion circuit, connected to the range adaptive acquisition circuit of the DC voltage divider, for acquiring the first output signal of the DC voltage divider to be acquired; The processor is respectively connected to the range adaptive acquisition circuit of the DC voltage divider and the data conversion circuit, and is used to obtain a first output signal of the output signal of the DC voltage divider to be collected and a second output signal of the range adaptive acquisition circuit of the DC voltage divider, and to sample the first output signal and the second output signal respectively to obtain a first measurement signal and a second measurement signal; the first measurement signal and the second measurement signal are used to be sent to a back-end computer device.

10. The device according to claim 9, characterized in that The device also includes: A TDM protocol logic circuit is connected to the processor, and is used to receive the first measurement signal and the second measurement signal, and compare the first measurement signal with the second measurement signal, and when the difference between the first measurement signal and the second measurement signal satisfies a preset error range, send the first measurement signal or the second measurement signal to the back-end computer device in the form of a TDM protocol.

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