CN210982710U - Detection circuit for parameters of voltage division circuit and electric energy metering chip - Google Patents
Detection circuit for parameters of voltage division circuit and electric energy metering chip Download PDFInfo
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- CN210982710U CN210982710U CN201921006049.2U CN201921006049U CN210982710U CN 210982710 U CN210982710 U CN 210982710U CN 201921006049 U CN201921006049 U CN 201921006049U CN 210982710 U CN210982710 U CN 210982710U
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Abstract
The application belongs to the technical field of voltage detection, and provides a detection circuit for parameters of a voltage division circuit, which comprises a voltage division circuit coupled with a first signal source with a first frequency, wherein the voltage division circuit comprises a first voltage divider, a second voltage divider and a third voltage divider which are connected in series, a voltage measurement module is connected in parallel on the second voltage divider, and the detection circuit further comprises a second signal source and a direct current signal source; the direct current signal source is used for providing a direct current bias for the voltage measuring module, a buffer used for configuring input impedance, common mode rejection and linearity is arranged at the input end of the voltage measuring module, and the voltage measuring module is used for detecting a first signal component of the second frequency on the second voltage divider and determining whether the circuit parameters of the voltage dividing circuit are abnormal or not according to the first signal component.
Description
Technical Field
The application belongs to the technical field of voltage detection, and particularly relates to a detection circuit for voltage division circuit parameters and an electric energy metering chip.
Background
The intelligent development of the electric energy metering system requires the establishment of an intelligent power grid, so that the automation and informatization of the power grid can be favorably enhanced, the self-protection capability of the power grid is enhanced, and the operation and safety of the power grid are better maintained. The intelligent electric energy metering system requires the realization of digitization, standardization, networking and intellectualization of electric energy metering. The digitization refers to the realization of a novel digital electric energy metering device by adopting a new technology, and the precision and the reliability of basic data are realized; the intellectualization of the intelligent electric energy meter is that on the basis of accurate electric energy metering data, the electricity utilization information of a user, the working information of the electric energy meter (such as whether the metering precision is changed) and the abnormal conditions of the electric energy meter (such as short circuit, open circuit, electricity stealing and the like) can be stored. Therefore, the electric energy meter with accurate automatic fault detection is an important component of the intelligent electric energy metering system.
At present, in a current voltage measuring device with fault detection, a special detection signal is generally sent to an Analog-to-Digital Converter (ADC) through a sampling network, Digital output converted by the ADC enters a Digital processing unit to perform voltage amplitude and phase processing, and by observing amplitude and phase changes of the detection signal, it is possible to know the fault of an off-chip component in the off-chip sampling network, thereby knowing the voltage measurement error; and normal voltage measurement is also carried out by using the ADC (in the electric energy meter, the voltage measurement result is finally used for electric energy measurement). However, both the detection signal and the voltage measurement signal sent to the ADC do not contain a dc component, and in a situation where a dc potential offset is required, the measurement accuracy of the voltage to be measured and the measurement accuracy of the fault detection signal are affected.
Disclosure of Invention
The application aims to provide a detection circuit for parameters of a voltage division circuit and an electric energy metering chip, and aims to solve the problems that the measurement precision of a measured voltage and the measurement precision of a fault detection signal are not high in a scene that a direct current potential offset is needed by the existing voltage measurement circuit.
A first aspect of the embodiments of the present application provides a detection circuit for a voltage division circuit parameter, including a voltage division circuit coupled to a first signal source having a first frequency, the voltage division circuit includes a first voltage divider, a second voltage divider and a third voltage divider connected in series, a voltage measurement module is connected in parallel to the second voltage divider, the detection circuit further includes:
the second signal source is input at the connecting end of the second voltage divider and the third voltage divider, and has a second frequency;
the input end of the voltage measurement module is provided with a buffer which configures impedance, common mode rejection and linearity according to requirements, the voltage measurement module is used for detecting a first signal component of the second frequency on the second voltage divider, and whether the circuit parameters of the voltage division circuit are abnormal is determined according to the first signal component.
A second aspect of the embodiments of the present application provides an electric energy metering chip, where the electric energy metering chip includes the above-mentioned detection circuit; the voltage division circuit is arranged outside the electric energy metering chip.
A third aspect of the embodiments of the present application provides an electric energy metering chip, which includes a voltage dividing circuit, and the electric energy metering chip further includes the above-mentioned detection circuit.
The voltage measuring module of the voltage division circuit parameter detecting circuit has a fault detection function, a direct current signal source is added on the basis, current passing through the voltage division resistor string through the direct current signal source provides direct current bias for the voltage measuring circuit with faults, the scene that a measuring device needs direct current potential bias is met, and the measuring precision of voltage measurement and the measuring precision of fault detection signals are improved.
Drawings
Fig. 1 is a block diagram of a circuit for detecting a voltage divider parameter according to a first embodiment of the present disclosure;
fig. 2 is a block diagram of a circuit for detecting a voltage divider parameter according to a second embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a first embodiment of a voltage measurement module in the detection circuit shown in FIG. 1 or FIG. 2;
FIG. 4 is a schematic diagram of a second embodiment of a voltage measurement module in the detection circuit shown in FIG. 1 or FIG. 2;
FIG. 5 is a schematic diagram of a third embodiment of a voltage measurement module in the detection circuit shown in FIG. 1 or FIG. 2;
FIG. 6 is a waveform of a measurement signal and a detection signal in the detection circuit shown in FIG. 5;
fig. 7 is a schematic diagram of a circuit for detecting parameters of a voltage divider circuit according to a third embodiment of the present application;
fig. 8 is a schematic diagram of a circuit for detecting a voltage divider parameter according to a fourth embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Referring to fig. 1 and fig. 2, a circuit for detecting parameters of a voltage divider according to an embodiment of the present disclosure includes a voltage divider 20 coupled to a first signal source 10 having a first frequency, the voltage divider 20 includes a first voltage divider 21, a second voltage divider 22, and a third voltage divider 23 connected in series, the second voltage divider 22 is connected in parallel to a voltage measuring module 30, the circuit further includes a second signal source 40 and a dc signal source 50, the second signal source 40 is input at a connection end of the second voltage divider 303 and the third voltage divider, and the second signal source 40 has a second frequency; the dc signal source 50 is connected to the first connection end (see fig. 1, i.e., the connection end of the first voltage divider 21 and the second voltage divider 22) or the second connection end (see fig. 2, i.e., the connection end of the second voltage divider 22 and the third voltage divider 23) of the second voltage divider 22, the dc signal source 50 is configured to provide a dc bias to the voltage measurement module 30, and the voltage measurement module 30 is configured to detect a first signal component of the second frequency on the second voltage divider 22, and determine whether the circuit parameter of the voltage divider circuit 20 is abnormal according to the first signal component. At the same time, it can be determined whether or not a circuit parameter (feedback resistance used in the signal source generating circuit) of the second signal source 40 is abnormal.
It will be appreciated that the second signal source 40 may also be switched in via a first switch (not shown), and the voltage measurement module 30 detects the first signal component if only the first switch is switched in. The second signal source 40 is an ac current source and the dc signal source 50 is a dc current source. In addition, the measured voltage VmIs different from the frequency of the second signal source 40, which is a non-integer multiple of the first frequency. For example a measured voltage VmThe frequency of the second signal source 40 is selected to be 432Hz when the frequency is 50 Hz. The second signal source 40 is mainly a current source generated by a combination of a reference voltage source, an operational amplifier, a current mirror tube and a feedback resistor. The internal circuit of the actual current source can control the output waveform of the current source to be an alternating current signal through a switch. The first voltage divider 21, the second voltage divider 22 and the third voltage divider 23 are all circuits composed of at least one of resistors, inductors and capacitors, and the resistance values thereof are R respectivelyext1、Rint1、Rint2。
Referring to fig. 1 and 2, the voltage measurement module 30 includes an analog-to-digital conversion unit (ADC)31 and a digital signal processing unit (processor) 32. Specifically, the DC current I of DC signal source 50dcAfter flowing through the first voltage divider 21, the second voltage divider 22 and the third voltage divider 23, a dc level is generated at two terminals P/N of the input terminal of the ADC31, so as to provide a dc offset to the ADC 31.
DC level V generated by input terminal P/N of ADC31P,dc/VN,dcRespectively as follows:
VN,dc＝Idc·Rint2
since the voltage to be measured is generally attenuated to the safe range of the input voltage of the ADC through the sampling network (voltage divider circuit 20) in the voltage measurement, the resistance R of the commonly used first voltage divider 21ext11M ohms, the resistance R of the second voltage divider 22 and the third voltage divider 23int1/Rint21K ohms, so the dc difference at the input P/N of the ADC31 is:
thus VP,dc/VN,dcThe dc voltage values of the two are close to each other, and a proper dc bias can be provided for the ADC 31.
For the DC difference existing at the input end P/N of the ADC31, because the digital signal processing unit 31 can use a high-pass filter at the DC portion to filter out the DC difference existing at the input end P/N of the DC component ADC31, the measurement accuracy of the fault detection circuit and the measurement accuracy of the voltage measurement circuit will not be affected, and the scenario that the measurement device needs DC potential offset can be satisfied, and the measurement accuracy of the voltage measurement and the measurement accuracy of the fault detection signal are improved.
Referring to fig. 3, in another embodiment, the voltage measuring module 30 includes a buffer 33, an analog-to-digital converting unit 31, and a digital signal processing unit 32. The buffer 33 voltage measurement module 30 for configuring the input impedance, the common mode rejection and the linearity needs to detect the second signal component (voltage measurement signal) of the first frequency on the second voltage divider 22 while measuring the fault detection signal (first signal component), correct the circuit parameter of the voltage dividing circuit 20 according to the first signal component and the second signal component, and perform normal voltage measurement according to the second signal component and the corrected circuit parameter of the voltage dividing circuit 20. In one embodiment, the internal resistance R _ in of the buffer 33 is greater than or equal to 100M ohms, such as between 200M and 300 Mohms. The voltage measurement module 30 is added with a buffer 33 with high input impedance, high common mode rejection and high linearity, so that the phenomenon that the detection signal is violently changed along with the internal resistance change of the detection circuit can be eliminated, the common mode part of the detection signal can be restrained, and the linearity requirement of the detection circuit can be met. The measurement accuracy of the detection signal is ensured, and the linearity requirement during voltage measurement can be met.
In conjunction with fig. 2 and 3, assume that the second signal source 40 has a frequency fiAssuming a voltage signal V to be measuredmIs an alternating current signal and has a frequency fuAnd f isi≠fuThe input impedance of the buffer 33 is defined as Rin。
Defining the voltage signal generated by the second signal source 40 at the input terminal of the buffer 33 via the voltage dividing circuit 20 as U0,fi_1。
Separately calculating the differential voltage signal U generated by the second signal source 40 through the voltage dividing circuit 200,fi_1_dm：
Since the voltage to be measured is generally attenuated to the safe range of the input voltage of the ADC31 through the sampling network (voltage divider circuit 20) in the voltage measurement, the resistance R of the commonly used first voltage divider 21ext11M ohms, the resistance R of the second voltage divider 22 and the third voltage divider 23int1、Rint21K ohms if the internal resistance of the buffer RinWhen the voltage changes between 200M and 300M ohms (the worst buffer internal resistance change range), the differential voltage part U of the detection signal0,fi_1_dmThe change is about 0.1%, so that the measurement accuracy of the detection signal is not substantially affected by the change in the internal resistance of the buffer.
Separately calculating the common mode voltage signal U generated by the second signal source 40 through the voltage dividing circuit 200,fi_1_cm：
According to the common internal resistance R of the first voltage divider 21, the second voltage divider 22 and the third voltage divider 23 and the buffer 33inValue of U can be obtained0,fi_1The common-mode signal of the buffer 33 is more than 2000 times higher than the differential signal, so that the buffer 33 has strong common-mode rejection capability, which can eliminate the common-mode value of the detection signal and ensure that the detection signal at the input end of the analog-to-digital conversion unit 31 has only a differential part, thereby reducing the common-mode rejection requirement of the analog-to-digital conversion unit 31; while the buffer itself does not convert the common mode portion of the detection signal into a differential signal. The above-mentioned features of the buffer ensure that the measurement accuracy of the detection signal is not affected by the common mode part of the detection signal.
While the buffer 33 is required to have high linearity because the measured voltage V is highmThe voltage V is a strong input signal, the signal amplitude is large, and the linearity of the measuring device is required to be enough to meet the measured voltage VmThe measurement accuracy of (2).
Referring to fig. 4, as another embodiment, the voltage measurement module 30 includes a first buffer 301, a second buffer 302, a measurement correction unit 303, and a voltage measurement unit 304.
The first buffer 301 is used for configuring input impedance and common mode rejection, the first buffer 301 is connected with the second voltage divider in parallel, and the measurement correction unit 303 is connected with the first buffer 301; it will be appreciated that the measurement correction unit 303 comprises an analog to digital converter and a digital signal processor. The measurement and correction unit 303 is configured to detect a first signal component of the second frequency on the second voltage divider, determine whether a circuit parameter of the voltage divider circuit is abnormal according to the first signal component, and correct the voltage divider circuit parameter when the circuit parameter is abnormal. The second buffer 302 is used for configuring linearity, the second buffer 302 is connected with the second voltage divider in parallel, and the voltage measurement unit 304 is connected with the second buffer 302; it will be appreciated that the voltage measurement unit 304 includes an analog-to-digital converter and a digital signal processor. The voltage measuring unit 304 is used for detecting a second signal component of the first frequency on the second voltage divider, and the measurement correcting unit 303 corrects the voltage dividing circuit parameter according to the first signal component and the second signal component. The voltage measurement unit 304 performs voltage measurement according to the second signal component and the corrected voltage division circuit parameter.
In the embodiment, the voltage measurement signal and the fault detection signal are respectively measured by different channels, so that the normal measurement of the measurement signal is not influenced while the fault detection signal is corrected; the voltage measuring device avoids the situation that a detection signal and a measuring signal are introduced into a voltage measuring channel at the same time, and the normal measurement of the voltage measuring device can be influenced by the correction of the detection signal.
Referring to fig. 5, the voltage measurement module 30 further includes an error correction switch 305, the error correction switch 305 is connected in parallel with the second voltage divider 22, the error correction switch 305 is connected in series with the first buffer 301, and the error correction switch 305 is configured to invert the signal of the analog-to-digital converter connected to the measurement correction unit 304. Referring to FIG. 6, when the tape measure and correction unit 303 turns on the correction function, the error correction switch 305 switches the positive and negative inputs of the measure and correction unit 303 at time T1 and time T2, and the detection signal at the input of the measure and correction unit 303 is named VedtFIG. 6 shows V of the measurement correction unit 303edtV of waveform and voltage measurement module 30mWaveform, as can be seen from FIG. 6, when the measurement correction unit 303 aligns VedtV of the voltage measuring module 30 when the signal is correctedmThe signal is not affected at all, and the normal work can be realized, so that the electric energy metering of the final electric energy meter is not affected.
Referring to fig. 7 and 8, the detection circuit further includes a third signal source 60 having a third frequency. A third signal source 60 is input at the connection end of the first voltage divider 21 and the second voltage divider 22; the measurement correction unit 303 is further configured to detect a third signal component of a third frequency on the second voltage divider 22, and determine whether a circuit parameter of the voltage divider circuit is abnormal according to the third signal component. In another embodiment, the third signal source 60 and the second signal source 40 are the same signal source and are input through another branch at the connection end of the first voltage divider 21 and the second voltage divider 22.
As a preferred embodiment, the measurement and correction unit 303 is specifically configured to process the first signal component and the third signal component to obtain an amplitude value and a phase value of the first signal component and an amplitude value and a phase value of the third signal component, respectively, and determine whether the circuit parameter of the voltage division circuit 20 is abnormal according to at least one of a change in the amplitude value of the first signal component, a change in the amplitude value of the third signal, a change in the phase of the first signal component, and a change in the phase of the third signal component.
The third signal source 60 is also an ac current source, and the second signal source 40 and the third signal source 60 may have the same or different frequencies and the same or different amplitudes.
The third signal source 60/the second signal source 40 may also be switched in via a second switch (not shown), and the measurement correction unit 303 detects the second signal component in case only the second switch is switched in. The third signal source 60 is an AC current source and measures the voltage VmIs different from the frequency of the third signal source 60, which is a non-integer multiple of the first frequency. For example a measured voltage VmThe frequency of the third signal source 60 is optionally 432Hz when the frequency is 50 Hz. The third signal source 60 is a current source mainly generated by a combination of a reference voltage source, an operational amplifier, a current mirror tube and a feedback resistor. The internal circuit of the actual current source can control the output waveform of the current source to be an alternating current signal through a switch.
As an embodiment, the internal resistance feedback resistors used in the signal source circuits of the second signal source 40 and the third signal source 60 are the same as the temperature coefficient of the first voltage divider 21. At the same time, the temperature coefficient of the first voltage divider 21 of the measurement channel can be cancelled by the temperature coefficient of the feedback resistor. Thus, the feedback resistors of the second signal source 40 and the third signal source 60 can be placed off-chip, mainly because an ac current source with any temperature coefficient can be obtained by selecting an off-chip resistor with any temperature coefficient.
The second voltage divider 22, the third voltage divider 23 and the voltage measurement module 30 are on-chip devices of the integrated circuit, and the feedback resistors used in the generating circuits of the first voltage divider 21, the second signal source 40 and the third signal source 60 are off-chip devices of the integrated circuit. The main reason for choosing to place the feedback resistances of the second and third signal sources 40, 60 off-chip is by choosing an arbitrary temperatureThe off-chip resistance of the temperature coefficient can obtain a current source with any temperature coefficient. At the same time, the temperature coefficient of the feedback resistor can be used for offsetting the first resistor R of the measuring channelext1The temperature coefficient of (a).
The voltage divider circuit 20 is not limited to the impedance type, and Z0, Z1, and Z2 in the following figures may be impedances such as a resistor, a capacitor, and an inductor, or a combination thereof, for example, impedances such as parallel connection of resistors and capacitors. If the sampling network comprises components such as capacitors and inductors, the fault source can be positioned by monitoring the amplitude and phase change of the detection signal at the same time.
An additional alternating current source is introduced into a conventional voltage measuring channel, and whether an off-chip component has a fault or not is positioned by means of known information of the alternating current source and certain switching time sequence information, so that the function of accurately positioning a fault source is achieved. Meanwhile, by the voltage measuring device, the off-chip resistors with the same temperature coefficient are reasonably selected, so that a voltage measuring system has a temperature compensation effect, the voltage measuring precision can be further improved, and the influence of temperature drift on a voltage measuring result is reduced. The applied alternating current source signal may be various periodic signals, such as a sine wave signal, a square wave signal, a triangular wave signal, and the like.
The embodiment of the present application further provides a method for detecting parameters of a voltage division circuit, including:
the method comprises the following steps:
loading a first signal source with a first frequency at two ends of a voltage division circuit; the voltage division circuit comprises a first voltage divider, a second voltage divider and a third voltage divider which are connected in series;
step two:
a second signal source with a second frequency is connected to the first connection end of the second voltage divider, and a direct current signal source for providing direct current bias is connected to the first connection end or the second connection end of the second voltage divider;
step three:
and detecting a first signal component of the second frequency on the second voltage divider, and determining whether the circuit parameter of the voltage dividing circuit is abnormal according to the first signal component.
In a further embodiment, step three is performed: and when detecting the first signal component of the second frequency on the second voltage divider, configuring input impedance, common mode rejection and linearity configuration on the first signal component by using a buffer.
In a further embodiment, the detection method further comprises:
detecting a second signal component of the first frequency on the second voltage divider;
and correcting the voltage division circuit parameter according to the first signal component and the second signal component.
In a further embodiment, the detection method further includes:
a second signal source with a third frequency is connected to a second connection end of the second voltage divider;
and detecting a third signal component of the third frequency on the second voltage divider, and determining whether the circuit parameter of the voltage dividing circuit is abnormal according to the third signal component.
The embodiment of the application also provides an electric energy metering chip which comprises the detection circuit. In the embodiment of the present application, the voltage dividing circuit is disposed outside the electric energy metering chip. Specifically, the detection circuit is integrated inside the chip, and at this time, the detection circuit inside the chip is not affected by the external environment, and further, the switching states of the first switch and the second switch may be set in advance in the voltage measurement module to be switched to the switching states after being started.
The embodiment of the application also provides another electric energy metering chip, which comprises a voltage division circuit and the detection circuit.
The voltage measuring module for detecting the parameters of the voltage division circuit has a fault detection function, a direct current signal source is added on the basis, the current passing through the voltage division resistor string by the direct current signal source provides a direct current bias for the voltage measuring module with the fault, the scene that a measuring device needs the direct current potential bias is met, and the measuring precision of voltage measurement and the measuring precision of a fault detection signal are improved.
In addition, a buffer is added at the input side, the buffer can be set to have the characteristic of high input impedance, and the influence of limited ADC internal resistance on the accuracy of the fault detection signal can be eliminated; the buffer can also be provided with the characteristic of high common mode rejection, the common mode part of a detection signal can be rejected, and the fault detection signal at the output (input of the ADC) of the high common mode buffer is ensured not to have the high common mode signal any more, so that the common mode rejection pressure of the ADC is reduced, and the measurement accuracy of the fault detection signal is improved; meanwhile, the buffer can be provided with the characteristic of high linearity, and the linearity requirement of the voltage measuring device in measuring a strong-amplitude measured voltage signal can be ensured.
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.
Claims (10)
1. A detection circuit for detecting parameters of a voltage division circuit, comprising a voltage division circuit coupled to a first signal source with a first frequency, wherein the voltage division circuit comprises a first voltage divider, a second voltage divider and a third voltage divider connected in series, and a voltage measurement module is connected in parallel to the second voltage divider, the detection circuit further comprising:
a second signal source with a second frequency is input at the connection end of the second voltage divider and the third voltage divider;
the direct current signal source is connected to the first connecting end or the second connecting end of the second voltage divider and is used for providing a direct current bias for the voltage measuring module;
the voltage measuring module is used for detecting a first signal component of the second frequency on the second voltage divider and determining whether a circuit parameter of the voltage dividing circuit is abnormal or not according to the first signal component.
2. The detection circuit of claim 1, wherein the voltage measurement module input provides a buffer to configure input impedance, common mode rejection, and linearity.
3. The detection circuit of claim 1, wherein the voltage measurement module comprises a first buffer, a second buffer, a voltage measurement unit, and a measurement correction unit, wherein:
the first buffer is used for configuring input impedance and common mode rejection, the first buffer is connected with the second voltage divider in parallel, and the measurement correction unit is connected with the first buffer; the measurement correction unit is used for detecting a first signal component of the second frequency on the second voltage divider, determining whether a circuit parameter of the voltage dividing circuit is abnormal according to the first signal component, and correcting the voltage dividing circuit parameter when the circuit parameter is abnormal;
the second buffer is used for configuring linearity, the second buffer is connected with the second voltage divider in parallel, and the voltage measuring unit is connected with the second buffer; the voltage measuring unit is configured to detect a second signal component of the first frequency on the second voltage divider, and perform voltage measurement according to the second signal component and the corrected voltage dividing circuit parameter.
4. The detection circuit of claim 3, wherein the voltage measurement module further comprises an error correction switch connected in parallel with the second voltage divider, the error correction switch being connected in series with the first buffer, the error correction switch being configured to flip positive and negative signals coupled to the measurement correction unit.
5. The detection circuit of any of claims 1 to 4, wherein the detection circuit further comprises:
a third signal source having a third frequency and input at a connection end of the first voltage divider and the second voltage divider;
the voltage measuring module is further configured to detect a third signal component of the third frequency on the second voltage divider, and determine whether a circuit parameter of the voltage dividing circuit is abnormal according to the third signal component.
6. The detection circuit according to claim 5, wherein the voltage measurement module is specifically configured to process the first signal component and the third signal component to obtain an amplitude value and a phase value of the first signal component and an amplitude value and a phase value of the third signal component, respectively, and determine whether the circuit parameter of the voltage divider circuit is abnormal according to at least one of a change in the amplitude value of the first signal component, a change in the amplitude value of the third signal, a change in the phase of the first signal component, and a change in the phase of the third signal component.
7. The detection circuit of claim 5, wherein the second and third signal sources are alternating current sources and the direct current source is a branch current source; the second frequency and the third frequency are the same or different and are both in non-integral multiple relation with the first frequency.
8. The detection circuit of claim 1, wherein the second voltage divider, the third voltage divider, and the voltage measurement module are on-chip devices of an integrated circuit, and the feedback resistors used in the first voltage divider and the second signal source generation circuit are off-chip devices of the integrated circuit.
9. An electric energy metering chip, characterized in that it comprises a detection circuit according to any one of claims 1 to 8; the voltage division circuit is arranged outside the electric energy metering chip.
10. An electric energy metering chip comprising a voltage dividing circuit, characterized in that the electric energy metering chip further comprises a detection circuit according to any one of claims 1 to 8.
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