A metering chip and electric energy meter

Abstract

The present invention discloses a metering chip and an electric energy meter, and relates to the technical field of electric energy metering. The current value of the metering chip is determined according to the resistance value of the first resistor and the resistance ratio adjustment, so as to compare with the preset value to determine the current test result of the metering chip. Furthermore, by adjusting the resistance value of the first resistor and the resistance ratio of the adjustment circuit, different paths in a fine-tuning manner are opened to output the desired current value, and the current size can be flexibly monitored. There is no need to build a peripheral circuit, and it is realized by the self-test circuit method of the metering chip inside the electric energy meter, which saves costs. In addition, the self-test current can achieve the flexibility of current output through fine-tuning, that is, the corresponding amplitude and frequency can be flexibly adjusted, thereby improving the flexibility of current monitoring.

Description

Technical Field

[0001] The present invention relates to the technical field of electric energy metering, and in particular to a metering chip and an electric energy meter. Background Art

[0002] During the use of electric energy meters, large measurement errors often occur, which may be caused by reasons such as failure of the metering circuit or aging of the metering chip.

[0003] In order to monitor and correct these errors in time, the conventional solution is to use peripheral hardware circuits to drive a current of fixed magnitude and frequency to the manganese copper, and then calculate the value of this current by sampling to determine whether the energy measurement is normal. However, this solution has some problems: first, it is necessary to build a peripheral circuit and provide a separate power supply, which increases the cost; second, the amplitude and frequency of the self-test current are fixed and cannot be changed.

[0004] Therefore, how to save costs and increase the flexibility of current monitoring is an urgent problem that those skilled in the art need to solve. Summary of the invention

[0005] The purpose of the present invention is to provide a metering chip and an electric energy meter to solve the cost problem of building peripheral circuits and providing independent power supply in conventional electric energy meters and the problem of poor current monitoring flexibility caused by fixed amplitude and frequency of self-test current.

[0006] In order to solve the above technical problems, the present invention provides a metering chip, the metering chip includes at least one regulating circuit; the regulating circuit includes a first resistor, a first amplifier and at least one resistor amplification module;

[0007] The first end of the first resistor is connected to the in-phase input end of the first amplifier; the second end of the first resistor is connected to the first end of the resistor amplification module; the inverting input end of the first amplifier is connected to the second end of the resistor amplification module; the output end of the first amplifier is connected to the third end of the resistor amplification module; the fourth end of the resistor amplification module outputs the current value of the metering chip;

[0008] The resistance amplification module is used to determine the current value of the metering chip according to the resistance value of the first resistor and the resistance ratio adjustment, so as to determine the current test result of the metering chip by comparing with a preset value.

[0009] On the one hand, the resistance amplification module includes a first switch, a second switch, a first switch tube and a second resistor;

[0010] The first end of the first switch serves as the second end of the resistance amplification module; the second end of the first switch is connected to the first end of the second resistor; the second end of the second resistor serves as the first end of the resistance amplification module;

[0011] The first end of the second switch serves as the third end of the resistance amplification module; the second end of the second switch is connected to the control end of the first switch tube; and the second end of the first switch tube serves as the fourth end of the resistance amplification module.

[0012] On the other hand, one of the regulating circuits includes a plurality of the resistance amplification modules;

[0013] The second end of the first switch of the current resistance amplifying module is connected to the first end of the first switch of the next resistance amplifying module; the second end of the second switch of the current resistance amplifying module is connected to the first end of the second switch of the next resistance amplifying module;

[0014] The second end of the first switch tube of the current resistance amplifying module is connected to the second end of the first switch tube of the next resistance amplifying module; the second end of the first resistor of the current resistance amplifying module is connected to the second end of the first resistor of the next resistance amplifying module;

[0015] When the current resistance amplification module is the first resistance amplification module, the first end of the first switch of the current resistance amplification module is connected to the inverting input end of the first amplifier; the first end of the second switch of the current resistance amplification module is connected to the non-inverting input end of the first amplifier.

[0016] On the other hand, the metering chip includes a plurality of regulating circuits; the resistance value of the first resistor of each regulating circuit is different, and the corresponding regulating range is different;

[0017] The first ends of the first resistors of the regulating circuits are connected to each other, and the second ends of the first resistors of the regulating circuits are connected to each other.

[0018] On the other hand, it also includes a multiple-choice-one channel selection circuit;

[0019] The output ends of the regulating circuits are connected to each other and to the one-of-many channel selection circuit to output current values ​​corresponding to different regulating ranges.

[0020] In another aspect, at least one second amplifier is included;

[0021] The output end of the second amplifier is connected to the first end of the first resistor of the regulating circuit;

[0022] The inverting input terminal of the second amplifier is grounded; and the non-inverting input terminal of the second amplifier is connected to the input current.

[0023] On the other hand, when there are multiple regulating circuits, the number of the second amplifiers is the same as the number of the regulating circuits; the metering chip further includes a second switch tube; wherein the number of the second switch tubes is the same as the number of the regulating circuits;

[0024] The non-inverting input terminal of the current second amplifier is connected to the non-inverting input terminal of the next second amplifier; when the current second amplifier is the first second amplifier, the non-inverting input terminal of the first second amplifier is connected to the input current;

[0025] The control end of the current second switch tube is connected to the output end of the current second amplifier; the first end of the current second switch tube is connected to the first end of the first resistor in the corresponding regulating circuit; and the second end of the current second switch tube is grounded.

[0026] On the other hand, the metering chip is used to convert the current value into an amplitude to obtain a current amplitude; and compare the current amplitude with the preset value; if the difference between the current amplitude and the preset value is within a preset range, it is determined that the current value is qualified;

[0027] The metering chip is also used to determine the current frequency value according to the current value; if the current frequency value is a multiple of the preset frequency value, the current frequency value is replaced and a new current value is output.

[0028] In order to solve the above technical problems, the present invention also provides an electric energy meter, comprising the above-mentioned metering chip.

[0029] On the one hand, when the electric energy meter detects multiple loads; the current value output by the metering chip is used to obtain a corresponding voltage value at the target load; the voltage value is transformed to obtain a corresponding amplitude, and the corresponding electric energy meter test result is determined based on the relationship between the amplitude and the preset value.

[0030] The present invention provides a metering chip, the metering chip includes at least one regulating circuit; the regulating circuit includes a first resistor, a first amplifier and at least one resistor amplification module; the first end of the first resistor is connected to the in-phase input end of the first amplifier; the second end of the first resistor is connected to the first end of the resistor amplification module; the inverting input end of the first amplifier is connected to the second end of the resistor amplification module; the output end of the first amplifier is connected to the third end of the resistor amplification module; the fourth end of the resistor amplification module outputs the current value of the metering chip. The present invention determines the current value of the metering chip according to the resistance value of the first resistor and the resistance ratio adjustment, so as to compare with the preset value to determine the current test result of the metering chip. Further, by adjusting the resistance value of the first resistor and the resistance ratio of the regulating circuit, different paths of the fine-tuning method are opened to output the desired current value, and the current size can be flexibly monitored. There is no need to build a peripheral circuit, and it is realized by the self-test circuit method of the metering chip inside the electric energy meter, which saves costs. In addition, the self-test current can achieve the flexibility of current output through fine-tuning, that is, the corresponding amplitude and frequency can be flexibly adjusted, and the flexibility of current monitoring is improved.

[0031] In addition, the present invention also provides an electric energy meter having the same beneficial effects as the above-mentioned metering chip. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 A schematic diagram of the structure of a metering chip provided by an embodiment of the present invention;

[0034] Figure 2 A schematic diagram of the structure of an electric energy meter provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] The core of the present invention is to provide a metering chip and an electric energy meter to solve the cost problem of building peripheral circuits and providing independent power supply in conventional electric energy meters and the problem of poor current monitoring flexibility caused by fixed amplitude and frequency of self-test current.

[0037] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0038] It is understandable that in the process of using the electric energy meter, in order to correct and monitor the large error caused by the failure of the metering circuit or the aging of the metering chip, the power supply detection is performed through an additional peripheral circuit, which increases the cost, or the corresponding current value output is fixed and limited based on the fixed amplitude and frequency of the self-test current, which limits the detection scenario of the electric energy meter. The metering chip provided by the present invention can solve the above technical problems.

[0039] Figure 1 A schematic diagram of the structure of a metering chip provided by an embodiment of the present invention is shown in FIG. Figure 1 As shown, the metering chip includes at least one regulating circuit 1; the regulating circuit 1 includes a first resistor R1, a first amplifier U1 and at least one resistance amplification module 2;

[0040] The first end of the first resistor R1 is connected to the non-inverting input end of the first amplifier U1; the second end of the first resistor R1 is connected to the first end of the resistance amplification module 2; the inverting input end of the first amplifier U1 is connected to the second end of the resistance amplification module 2; the output end of the first amplifier U1 is connected to the third end of the resistance amplification module 2; the fourth end of the resistance amplification module 2 outputs the current value of the metering chip;

[0041] The resistance amplification module 2 is used to adjust and determine the current value of the metering chip according to the resistance value of the first resistor R1 and the resistance ratio, so as to compare with the preset value to determine the current test result of the metering chip.

[0042] It is understandable that the regulating circuit is used to adjust the resistance ratio of the circuit amplification module to ensure that the output current is in different current ranges. The resistance amplification module here is based on the original first resistor, and uses the resistance ratio to adjust the current in parallel. The function of the first amplifier is to stabilize the voltage by operational amplifier. By amplifying the input signal, according to the principle of negative feedback, the gain is large. Through the connection relationship between the first amplifier and the first resistor, and the connection relationship between the first amplifier and the resistance amplification module, the amplification function of the resistance ratio can be realized by the first amplifier, so that the resistance value of the first resistor is amplified by the resistance ratio, and the current value of the output metering chip is output.

[0043] The number of resistance amplification modules here can be one or more. In the case of one, it can only amplify once. If there are multiple resistance amplification modules, the selectivity of proportional amplification corresponding to different resistance amplification modules can be achieved according to the selection of multiple resistance amplification modules, thereby improving the flexibility of current output and avoiding the situation where the current value is fixed.

[0044] In addition, the corresponding regulating circuit of this embodiment can be one or more. If there is one regulating circuit, the corresponding regulating range realizes the fine adjustment of the current first resistor. If there are multiple regulating circuits, the corresponding regulating ranges under multiple different measurements can be realized. For example, there are two regulating circuits, the first regulating circuit and the second regulating circuit. The regulating range of the first regulating circuit is 50uA-1550uA, and its gear is 50uA. The regulating range of the second regulating circuit is 1mA-31mA, and the gear is 1mA. Finally, the current of different regulating ranges corresponding to the sum of the two regulating circuits is output, so that the selectivity of the regulating range is more.

[0045] A metering chip provided in an embodiment of the present invention comprises at least one regulating circuit; the regulating circuit comprises a first resistor, a first amplifier and at least one resistor amplification module; the first end of the first resistor is connected to the in-phase input end of the first amplifier; the second end of the first resistor is connected to the first end of the resistor amplification module; the inverting input end of the first amplifier is connected to the second end of the resistor amplification module; the output end of the first amplifier is connected to the third end of the resistor amplification module; the fourth end of the resistor amplification module outputs the current value of the metering chip. The present invention determines the current value of the metering chip according to the resistance value of the first resistor and the resistance ratio adjustment, so as to compare with the preset value to determine the current test result of the metering chip. Further, by adjusting the resistance value of the first resistor and the resistance ratio of the regulating circuit, different paths of the fine-tuning mode are opened to output the desired current value, and the current size can be flexibly monitored. There is no need to build a peripheral circuit, and it is realized by the self-test circuit mode of the metering chip inside the electric energy meter, which saves costs. In addition, the self-test current can realize the flexibility of current output through fine-tuning mode, that is, the corresponding amplitude and frequency can be flexibly adjusted, and the flexibility of current monitoring is improved.

[0046] In some embodiments, Figure 1 As shown, the resistance amplification module 2 includes a first switch S1, a second switch S2, a first switch tube Q1 and a second resistor R2;

[0047] The first end of the first switch S1 serves as the second end of the resistance amplification module 2; the second end of the first switch S1 is connected to the first end of the second resistor R2; the second end of the second resistor R2 serves as the first end of the resistance amplification module 2;

[0048] The first end of the second switch S2 serves as the third end of the resistance amplification module 2 ; the second end of the second switch S2 is connected to the control end of the first switch S1 ; the second end of the first switch Q1 serves as the fourth end of the resistance amplification module 2 .

[0049] It can be understood that the first switch, the second switch, and the first switch tube of a resistance amplification module determine whether forward amplification or reverse amplification is adopted on the basis of the first amplifier, and the corresponding current adjustment range is different. In addition, after the first switch tube realizes forward conduction, the output current value is output. There is no limitation on the resistance value of the second resistor, which can be larger or smaller than the resistance value of the first resistor, and it can be set according to the actual situation.

[0050] The first switch tube in this embodiment is a MOS tube type, and the specific type of the corresponding MOS tube is not limited. It can be a P channel or an N channel. If it is a P channel, the first end of the first switch tube is the source, the second end is the drain, and the control end is the gate.

[0051] The resistance amplification module provided in this embodiment adopts switch selection to determine whether to select the resistance amplification of the corresponding second resistor at present, thereby ensuring the accuracy of the amplification ratio of the input current.

[0052] In some embodiments, Figure 1 As shown, a regulating circuit 1 includes a plurality of resistance amplifying modules 2;

[0053] The second end of the first switch S1 of the current resistance amplifying module 2 is connected to the first end of the first switch S1 of the next resistance amplifying module 2; the second end of the second switch S2 of the current resistance amplifying module 2 is connected to the first end of the second switch S2 of the next resistance amplifying module 2;

[0054] The second end of the first switch tube Q1 of the current resistance amplifying module 2 is connected to the second end of the first switch tube Q1 of the next resistance amplifying module 2; the second end of the first resistor R1 of the current resistance amplifying module 2 is connected to the second end of the first resistor R1 of the next resistance amplifying module 2;

[0055] When the current resistance amplifying module 2 is the first resistance amplifying module 2 , the first end of the first switch S1 of the current resistance amplifying module 2 is connected to the inverting input end of the first amplifier U1 ; the first end of the second switch S2 of the current resistance amplifying module 2 is connected to the non-inverting input end of the first amplifier U1 .

[0056] Specifically, the connection between each resistance amplification module is achieved through a first switch and a second switch, the first end of the first switch of the first resistance amplification module is connected to the inverting input end of the first amplifier; the first end of the second switch of the current resistance amplification module is connected to the non-inverting input end of the first amplifier.

[0057] It is understandable that if you want to achieve amplification of multiple resistance ratios, the corresponding selection of the first switch and the second switch requires the continuous closing of the first switch and the second switch. For example, there are five resistance amplification modules (A, B, C, D, E). If you want to achieve resistance amplification of the C resistance amplification module, you need to close the first switch and the second switch of the A and B resistance amplification modules.

[0058] The connection relationship between the multiple resistance amplification modules provided in this embodiment improves the step-by-step amplification of the adjustment range and ensures the diverse selection of the resistance ratio adjustment current.

[0059] In some embodiments, Figure 1 As shown, the metering chip includes a plurality of regulating circuits 1; the resistance value of the first resistor R1 of each regulating circuit 1 is different, and the corresponding regulating range is different;

[0060] The first ends of the first resistors R1 of the regulating circuits 1 are connected to each other, and the second ends of the first resistors R1 of the regulating circuits 1 are connected to each other.

[0061] It can be understood that the adjustment of the resistance ratio based on the current first resistor in an adjustment circuit is an integer multiple relationship. If you want to achieve fine-tuning, you can add other adjustment circuits in addition to the smaller resistance of the first resistor, so that the adjustment ranges corresponding to the multiple adjustment circuits are different, and the difference between large adjustment and small adjustment is achieved, and the final adjustment range is fine-tuned. The connection between each adjustment circuit is that the first ends of the first resistors of each adjustment circuit are connected to each other, the second ends of the first resistors are connected to each other, and the corresponding resistance amplification modules are also connected to each other.

[0062] The connection relationship of the multiple regulating circuits provided in this embodiment enables the sum of the multiple regulating circuits to output currents of different regulating ranges, thereby providing more selectivity for the regulating range.

[0063] In some embodiments, Figure 1 As shown, it also includes a multiple-choice-one channel selection circuit 3;

[0064] The output ends of the regulating circuits 1 are connected to each other and to the multiple-choice-one channel selection circuit 3 to output current values ​​corresponding to different regulating ranges.

[0065] Taking into account the resistance values ​​corresponding to different loads in practical applications, the output adjustment flexibility of the corresponding current value in this embodiment adopts a multi-select channel selection circuit, which can correspond to the resistance of different loads connected, thereby realizing the flexibility of measurement of the electric energy meter.

[0066] In some embodiments, Figure 1 As shown, it also includes at least one second amplifier U2;

[0067] An output end of the second amplifier U2 is connected to a first end of a first resistor R1 of the regulating circuit 1;

[0068] The inverting input terminal of the second amplifier U2 is grounded; the non-inverting input terminal of the second amplifier U2 is connected to the input current.

[0069] Specifically, the function of the second amplifier is to stabilize the power flowing through the first resistor of the regulating circuit by buffering, thereby ensuring that the voltage input to the first resistor is in a stable state and improving the accuracy and stability of the output current.

[0070] In some embodiments, Figure 1 As shown, when there are multiple regulating circuits 1, the number of second amplifiers U2 is the same as the number of regulating circuits 1; the metering chip also includes a second switch tube Q2; wherein the number of the second switch tube Q2 is the same as the number of regulating circuits 1;

[0071] The non-inverting input terminal of the current second amplifier U2 is connected to the non-inverting input terminal of the next second amplifier U2; when the current second amplifier U2 is the first second amplifier U2, the non-inverting input terminal of the first second amplifier U2 is connected to the input current;

[0072] The control end of the current second switch tube Q2 is connected to the output end of the current second amplifier U2; the first end of the current second switch tube Q2 is connected to the first end of the first resistor R1 in the regulating circuit 1; and the second end of the current second switch tube Q2 is grounded.

[0073] Specifically, when the number of second amplifiers, the number of second switching tubes and the number of adjustment circuits are the same, corresponding to the connection relationship between the second amplifiers, the second switching tubes and the adjustment circuits, the role of the second switching tube in this embodiment is to use the buffering effect of the second amplifier to stabilize the first terminal voltage of the second switching tube, and the operational amplifier output opens the second switching tube to generate a current path, so as to adjust the resistance ratio of the resistance amplification module of the adjustment circuit and output the final current value.

[0074] The type of the second switch tube in this embodiment and the first switch tube in the above embodiment may be the same or different, and is not limited here. The channel corresponding to the current second switch tube is an N channel, which can be set according to actual conditions.

[0075] The second switch tube can control the on or off state of the monitoring current according to a set preset cycle, thereby saving the power consumption of the electric energy meter.

[0076] The connection relationship of the multiple regulating circuits provided in this embodiment is through the circuit connection part of the second amplifier and the second switch tube to improve the regulation diversity of the multiple regulating circuits.

[0077] In some embodiments, the metering chip is used to convert the current value into an amplitude value to obtain a current amplitude value; and compare the current amplitude value with a preset value; if the difference between the current amplitude value and the preset value is within a preset range, it is determined that the current value detection is qualified;

[0078] The metering chip is also used to determine the current frequency value according to the current value; if the current frequency value is a multiple of the preset frequency value, the current frequency value is replaced and a new current value is output.

[0079] The final current value measurement process of the metering chip in this embodiment is to convert the current value of the analog signal into the amplitude of the digital signal, and compare the amplitude with the preset value. If the difference is less than the preset range, it is determined that the current value is not much different and the detection is qualified.

[0080] In addition, the frequency of the conventional metering chip is fixed, and the present embodiment can flexibly adjust different frequencies. This is mainly because in the case of signal interference, the corresponding frequency has a multiple frequency relationship, resulting in inaccurate measured current values. Therefore, the present invention adjusts the fixed frequency to output a new current value for comparison.

[0081] The measurement process of the metering chip in this embodiment can flexibly adjust the magnitude and frequency of the detection current.

[0082] In addition, about Figure 1 A third resistor R3 is connected to the common connection point between the output terminal and the inverting input terminal of the second amplifier U2 corresponding to each regulating circuit 1, and the other end of the third resistor R3 is grounded. The third resistor R3 plays a feedback role, reduces nonlinear distortion and improves stability. A fourth resistor R4 is connected to the in-phase input terminal of the second amplifier to play a voltage dividing role with the DC current Idc.

[0083] Furthermore, the present invention also provides an electric energy meter, comprising the above-mentioned metering chip.

[0084] In some embodiments, when the electric energy meter detects multiple loads; the current value output by the metering chip is used to obtain the corresponding voltage value at the target load; the voltage value is transformed to obtain the corresponding amplitude, and the corresponding electric energy meter test result is determined based on the relationship between the amplitude and the preset value.

[0085] Figure 2 A schematic diagram of the structure of an electric energy meter provided by an embodiment of the present invention is shown in FIG. Figure 2 As shown, the load is on the left and the metering chip is on the right. The voltage divider resistor used can adopt multiple chip resistors. For example, in this embodiment, it corresponds to V1P-V1N, V2P-V2N and V3P-V3N. The current value output by the multi-select channel selection circuit of the electric energy meter reaches the manganese copper of the target load. The current value is calculated by sampling to determine whether the electric energy metering is normal.

[0086] For an introduction to an electric energy meter provided by the present invention, please refer to the above method embodiment, and the present invention will not be described in detail here. It has the same beneficial effects as the above metering chip.

[0087] The above is a detailed introduction to a metering chip and an electric energy meter provided by the present invention. The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the present invention.

[0088] It should also be noted that, in this specification, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

Claims

1. A metering chip, characterized in that: The metering chip includes at least one regulating circuit; the regulating circuit includes a first resistor, a first amplifier and at least one resistor amplification module; The first end of the first resistor is connected to the non-inverting input end of the first amplifier; the second end of the first resistor is connected to the first end of the resistor amplifying module; the inverting input end of the first amplifier is connected to the second end of the resistor amplifying module; the output end of the first amplifier is connected to the third end of the resistor amplifying module; The fourth terminal of the resistance amplification module outputs the current value of the metering chip; The resistance amplification module is used to determine the current value of the metering chip according to the resistance value of the first resistor and the resistance ratio adjustment, so as to determine the current test result of the metering chip by comparing with a preset value; The resistance amplification module includes a first switch, a second switch, a first switch tube and a second resistor; The first end of the first switch serves as the second end of the resistance amplification module; the second end of the first switch is connected to the first end of the second resistor; the second end of the second resistor serves as the first end of the resistance amplification module; The first end of the second switch serves as the third end of the resistance amplification module; the second end of the second switch is connected to the control end of the first switch tube; the second end of the first switch tube serves as the fourth end of the resistance amplification module; One of the regulating circuits includes a plurality of the resistance amplification modules; The second end of the first switch of the current resistance amplifying module is connected to the first end of the first switch of the next resistance amplifying module; the second end of the second switch of the current resistance amplifying module is connected to the first end of the second switch of the next resistance amplifying module; The second end of the first switch tube of the current resistance amplifying module is connected to the second end of the first switch tube of the next resistance amplifying module; the second end of the first resistor of the current resistance amplifying module is connected to the second end of the first resistor of the next resistance amplifying module; When the current resistance amplification module is the first resistance amplification module, the first end of the first switch of the current resistance amplification module is connected to the inverting input end of the first amplifier; the first end of the second switch of the current resistance amplification module is connected to the non-inverting input end of the first amplifier.

2. The metering chip according to claim 1, characterized in that: The metering chip includes a plurality of regulating circuits; the resistance value of the first resistor of each regulating circuit is different, and the corresponding regulating range is different; The first ends of the first resistors of the regulating circuits are connected to each other, and the second ends of the first resistors of the regulating circuits are connected to each other.

3. The metering chip according to claim 2, characterized in that: Also included is a multiple-choice-one channel selection circuit; The output ends of the regulating circuits are connected to each other and to the one-of-many channel selection circuit to output current values ​​corresponding to different regulating ranges.

4. The metering chip according to claim 1, characterized in that: Also comprising at least one second amplifier; The output end of the second amplifier is connected to the first end of the first resistor of the regulating circuit; The inverting input terminal of the second amplifier is grounded; and the non-inverting input terminal of the second amplifier is connected to the input current.

5. The metering chip according to claim 4, characterized in that: When there are multiple regulating circuits, the number of the second amplifiers is the same as the number of the regulating circuits; the metering chip further includes a second switch tube; wherein the number of the second switch tubes is the same as the number of the regulating circuits; The non-inverting input terminal of the current second amplifier is connected to the non-inverting input terminal of the next second amplifier; when the current second amplifier is the first second amplifier, the non-inverting input terminal of the first second amplifier is connected to the input current; The control end of the current second switch tube is connected to the output end of the current second amplifier; the first end of the current second switch tube is connected to the first end of the first resistor in the corresponding regulating circuit; and the second end of the current second switch tube is grounded.

6. The metering chip according to claim 1, characterized in that: The metering chip is used to convert the current value into an amplitude value to obtain a current amplitude value; and compare the current amplitude value with the preset value; if the difference between the current amplitude value and the preset value value is within a preset range, it is determined that the current value detection is qualified; The metering chip is also used to determine the current frequency value according to the current value; if the current frequency value is a multiple of the preset frequency value, the current frequency value is replaced and a new current value is output.

7. An electric energy meter, characterized in that: The metering chip comprises any one of claims 1 to 6.

8. The electric energy meter according to claim 7, characterized in that: When the electric energy meter detects multiple loads; the current value output by the metering chip is used to obtain a corresponding voltage value at the target load; the voltage value is transformed to obtain a corresponding amplitude, and the corresponding electric energy meter test result is determined based on the relationship between the amplitude and a preset value.

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