CN218767097U - Current detection device and electrical equipment - Google Patents
Current detection device and electrical equipment Download PDFInfo
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- CN218767097U CN218767097U CN202221136973.4U CN202221136973U CN218767097U CN 218767097 U CN218767097 U CN 218767097U CN 202221136973 U CN202221136973 U CN 202221136973U CN 218767097 U CN218767097 U CN 218767097U
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Abstract
The utility model discloses a current detection device and electrical equipment, this current detection device includes: the voltage division module is used for collecting current to be detected, converting the current to be detected into a plurality of voltage signals of different gears through the plurality of voltage division subunits and outputting the voltage signals; the gear selection module is used for selecting a voltage signal of a target gear from the voltage signals of the multiple different gears to output according to the gear setting signals received by the first controlled ends; and the gain amplification module is used for determining a target amplification factor corresponding to a target gear based on the gear setting signals received by the second controlled ends, amplifying the voltage signal of the target gear according to the target amplification factor and outputting a voltage signal to be detected. The utility model discloses can solve the problem that current detection scope switches the difficulty.
Description
Technical Field
The utility model relates to a current detection technical field, in particular to current detection device and electrical equipment.
Background
In a test equipment system, current detection is taken as an important link and mainly serves other module units, such as safety early warning when current is too large and estimation of battery SOC (battery residual capacity), when the battery is low in electric quantity, large current is difficult to provide for discharging, otherwise, irreversible damage may occur to a power battery; when the battery is charged, the battery is charged with small current when the battery is close to a full-charge state, otherwise, the battery generates a large amount of heat because the electric energy is not ready to be converted into chemical energy. The current detection methods commonly used at present mainly include a shunt method, a mutual inductor method and a hall sensor method. However, the prior art solutions have drawbacks, such as low detection accuracy and large volume of the shunt and transformer approaches; the general Hall mode can only detect one channel, and hard switching is needed when measuring signals with large fluctuation range, so that accurate monitoring cannot be realized.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main objective provides a current detection device, aims at solving the problem that current detection scope switches the difficulty.
In order to achieve the above object, the present invention provides a current detection device, including:
the voltage division module comprises a plurality of voltage division subunits and a plurality of current sampling output ends, and is used for collecting current to be detected, converting the current to be detected into a plurality of paths of voltage signals with different gears through the plurality of voltage division subunits and outputting the voltage signals;
the gear selection module is provided with a plurality of first controlled ends and a plurality of input ends, the plurality of input ends of the gear selection module are connected with the plurality of current sampling output ends of the voltage division module in a one-to-one correspondence manner, the plurality of input ends are used for receiving a plurality of paths of voltage signals of different gears output by the voltage division module, and the gear selection module is used for selecting a voltage signal of a target gear from the plurality of paths of voltage signals of different gears to output according to gear setting signals received by the plurality of first controlled ends;
the gain amplification module is provided with a plurality of second controlled ends, the input end of the gain amplification module is connected with the output end of the gear selection module, and the gain amplification module is used for determining a target amplification factor corresponding to the target gear based on gear setting signals received by the second controlled ends, amplifying a voltage signal of the target gear according to the target amplification factor and outputting a voltage signal to be detected; wherein the voltage signal to be measured is used to determine the value of the current to be measured by calculation.
Optionally, the current detection device further comprises:
the sampling control module is provided with a plurality of first control ends, the plurality of first control ends of the sampling control module are connected with the plurality of first controlled ends of the gear selection module in a one-to-one correspondence mode, the sampling control module is used for receiving an external gear setting signal and controlling the gear selection module to communicate the corresponding access end and output end according to the gear setting signal, and therefore the voltage signals of the target gear are selected from the voltage signals of the multiple different gears to be output.
Optionally, the sampling control module further has a plurality of second control terminals:
the sampling control module is used for controlling the gain amplification module to amplify the voltage signal of the target gear by a target amplification factor and then output a voltage signal to be detected.
Optionally, the current detection device further comprises:
and the input end of the differential driving module is connected with the output end of the gain amplification module, and the differential driving module is used for converting the voltage signal to be detected into a differential signal and then outputting the differential signal.
Optionally, the current detection device further includes:
and the input end of the sampling conversion module is connected with the output end of the gain amplification module, and the sampling conversion module is used for performing digital-to-analog conversion on the voltage signal to be detected and then outputting the voltage signal to be detected.
Optionally, the sampling conversion module includes:
the input end of the sampling conversion branch is connected with the output end of the gain amplification module, and the sampling conversion branch is used for performing digital-to-analog conversion on the voltage signal to be detected and then outputting the voltage signal to be detected.
Optionally, the current detection device further comprises:
and the input end of the signal buffer module is connected with the output end of the gain amplification module, and the signal buffer module is used for buffering the voltage signal to be detected and then outputting the buffered voltage signal.
Optionally, the voltage dividing module includes a first resistor, a second resistor, a third resistor, and a fourth resistor, a first end of the first resistor is connected to the sampling module, a second end of the first resistor is grounded, a first end of the second resistor is connected to the first end of the first resistor, a first end of the third resistor is connected to the second end of the second resistor, a first end of the fourth resistor is connected to the second end of the third resistor, and the fourth resistor is grounded; the common end of the first resistor and the second resistor is a current sampling output end of the voltage division module, and the common end of the third resistor and the fourth resistor is a current sampling output end of the voltage division module.
Optionally, the current detection device further includes:
and the output end of the sampling module is connected with the input end of the voltage division module and is used for collecting the current to be measured by utilizing the Hall sensor.
The utility model also provides an electrical equipment, electrical equipment includes foretell current detection device.
The utility model discloses technical scheme selects module and gain amplification module through setting up partial pressure module, gear, and the partial pressure module is provided with a plurality of electric current sampling outputs, correspondingly, and the gear is selected the module and is had a plurality of inputs and a plurality of electric current sampling output one-to-ones and be connected, and the gear is selected the module and can be according to received control signal, the input and the output that the intercommunication corresponds, with follow select the voltage signal output of target gear among the voltage signal of the different gears of multichannel to make gain amplification module basis the target amplification multiple is right the voltage signal of target gear is enlargied, and the output voltage signal that awaits measuring to realize the purpose of many gears multirange range switching sampling. The utility model discloses a set up partial pressure module, gear selection module and gain amplification module, realized that many gears multirange scope switches the purpose of sampling, solved the problem that current detection scope switches the difficulty.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic diagram of functional modules of an embodiment of the current detection apparatus of the present invention;
fig. 2 is a schematic diagram of functional modules of an embodiment of the current detection apparatus of the present invention;
fig. 3 is a schematic circuit diagram of an embodiment of the current detection device of the present invention;
fig. 4 is a schematic diagram of a circuit structure of an embodiment of a sampling conversion module in the current detection apparatus of the present invention.
The reference numbers illustrate:
the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, back, 8230; \8230;) are provided in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides a current detection device.
At present, current detection methods commonly used at present mainly include a shunt method, a mutual inductor method and a hall sensor method. However, the prior art has defects, for example, the detection precision of the current divider and the mutual inductor is not high and the volume is too large; the general Hall mode can only detect one channel, and hard switching is needed when a signal with a large fluctuation range is measured, so that accurate monitoring cannot be realized.
To solve the above problem, referring to fig. 1 to 4, in an embodiment, the current detection apparatus includes:
the voltage division module 20 comprises a plurality of voltage division subunits and a plurality of current sampling output ends, and the voltage division module 20 is used for collecting current to be detected, converting the current to be detected into a plurality of paths of voltage signals with different gears through the plurality of voltage division subunits and outputting the voltage signals;
the gear selection module 30 is provided with a plurality of first controlled terminals and a plurality of input terminals, the plurality of input terminals of the gear selection module 30 are connected with the plurality of current sampling output terminals of the voltage division module 20 in a one-to-one correspondence manner, the plurality of input terminals are used for receiving a plurality of voltage signals of different gears output by the voltage division module 20, and the gear selection module 30 is used for selecting a voltage signal of a target gear from the plurality of voltage signals of different gears to output according to gear setting signals received by the plurality of first controlled terminals;
the gain amplification module 50 is provided with a plurality of second controlled ends, and an input end of the gain amplification module 50 is connected with an output end of the gear selection module 30, and is used for determining a target amplification factor corresponding to the target gear based on the gear setting signals received by the plurality of second controlled ends, amplifying the voltage signal of the target gear according to the target amplification factor, and outputting a voltage signal to be measured; wherein the voltage signal to be measured is used to determine the value of the current to be measured by calculation.
In this embodiment, the voltage dividing module 20 is configured to collect a current to be measured, and the voltage dividing module 20 includes a plurality of voltage dividing sub-units. Further, the voltage dividing module 20 is provided with a plurality of voltage dividing subunits and a plurality of current sampling output ends, and is configured to convert the current to be detected into a plurality of voltage signals at different gears through the plurality of voltage dividing subunits and output the voltage signals, that is, convert the current to be detected into corresponding current-voltage detection values and output the current-voltage detection values, and each current sampling output end can output different current-voltage detection values, that is, has different sampling range ranges.
A plurality of partial pressure subelements of voltage divider module 20 can choose for use a plurality of divider resistance to realize to set up a plurality of electric current sampling output at a plurality of divider resistance's common port, so set up, can be through selecting different electric current sampling output, through choosing suitable divider resistance value promptly, make the electric current-voltage detection value scope control that electric current sampling output exported at suitable sampling range, thereby make voltage divider module 20 have different sampling range scopes.
The gear selection module 30 has a plurality of input terminals and is connected to the plurality of current sampling output terminals in a one-to-one correspondence manner, and the gear selection module 30 can select and connect the corresponding input terminal and output terminal according to the received control signal, so that the current-voltage detection value of the corresponding gear outputted by the current sampling output terminal corresponding to the voltage division module 20 can be obtained, and different sampling range ranges can be realized. The control signal may be sent by a controller of the electrical device or by other triggering means when triggered by a user. The gear selection module 30 may use a single-pole double-throw switch, a double-pole double-throw switch, or other switching devices to implement multi-gear sampling switching.
In an embodiment, the current detection device may be specifically as shown in fig. 3, and fig. 3 is a schematic circuit structure diagram of an embodiment of the current detection device. The voltage dividing module 20 is composed of a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4, a common end of the first resistor R1 and the second resistor R2 is a first current sampling output end, and a common end of the third resistor R3 and the fourth resistor R4 is a second current sampling output end, that is, in this embodiment, the voltage dividing module 20 has two current sampling output ends. The analog switch U1 selected by the gear selection module 30 is an SGM4517, which is a high-voltage, double single-pole double-throw (SPDT) analog switch with low on-resistance and high switching speed. The gear selection module 30 can communicate with the first current sampling output end or the second current sampling output end of the voltage division module 20 according to the received control signal. Specifically, the switching device of model SGM4517 has four moving contacts and two fixed contacts, the two fixed contacts of the double single-pole double-throw analog switch are two output ends of the gear selection module 30 connected to the subsequent stage circuit, the two moving contacts are respectively connected to the first current sampling output end and the second current sampling output end of the voltage division module 20, the other two moving contacts are grounded, that is, one of the fixed contacts is correspondingly connected to the first current sampling output end or the second current sampling output end of the sampling circuit, and the other fixed contact is correspondingly connected to the ground. With such a configuration, the gear selection module 30 can output two sampling differential signals to the subsequent circuit, so that the subsequent circuit can process the differential signals, thereby further improving the sampling precision.
The gain amplification module 50 is configured to amplify the current-voltage detection value output by the gear selection module 30 and output a voltage signal to be detected. The gain amplifying module 50 may be implemented by using an amplifier U2, and the gain amplifying module 50 may be specifically shown in fig. 3, where fig. 3 is a schematic circuit structure diagram of an embodiment of the current detecting device. The gain amplifying module 50 is implemented by using a digital programmable instrumentation amplifier AD8253, which has a higher input impedance, a lower output noise, a lower error, and a higher common mode rejection capability. The amplifiers U2 in the gain amplification module 50 all use distortion cancellation circuits, which achieve high linearity and ultra-low THD. By setting the gain amplification module 50 and the voltage division module 20 to perform double selection of the gear, more sampling gears can be obtained. So set up, the current sampling of different gears corresponds different magnification, and the difference is input to gain amplification module 50 behind the current-voltage detection value passes through gear selection module 30 to carry out the adjustment of different gains, thereby reach the benefit of stepping, and then will handle the high accuracy signal output that obtains to the back stage, can improve current detection device's sampling precision.
The utility model discloses technical scheme selects module 30 and gain amplification module 50 through setting up partial pressure module 20, gear, and partial pressure module 20 is provided with a plurality of electric current sampling output, correspondingly, and gear selection module 30 has a plurality of inputs and is connected with a plurality of electric current sampling output one-to-one, and gear selection module 30 can be according to received control signal, the input and the output that the intercommunication corresponds, with follow select the voltage signal output of target gear among the voltage signal of the different gears of multichannel to make gain amplification module 50 basis the target amplification factor is right the voltage signal of target gear is enlargied, exports the voltage signal that awaits measuring to realize the purpose of many gears multirange scope switching sampling. The utility model discloses a set up partial pressure module 20, gear selection module 30 and gain amplification module 50 for gear selection module 30 and gain amplification module 50 can provide the electric current sampling scope of multiple difference based on control signal's control, have realized that many gears multirange scope switches the purpose of sampling, have solved the problem that current detection scope switches the difficulty. And simultaneously, the utility model discloses a module 30 is selected to gear can export two way sampling difference signal to gain amplification module 50 for gain amplification module 50 can carry out further processing to difference signal, thereby has higher electric current sampling precision, has improved current detection device's stability and precision.
Referring to fig. 1 to 4, in an embodiment, the voltage dividing module 20 includes a first resistor, a second resistor, a third resistor, and a fourth resistor, a first end of the first resistor is connected to the sampling module 10, a second end of the first resistor is connected to ground, a first end of the second resistor is connected to the first end of the first resistor, a first end of the third resistor is connected to the second end of the second resistor, a first end of the fourth resistor is connected to the second end of the third resistor, and the fourth resistor is connected to ground; the common end of the first resistor and the second resistor is a current sampling output end of the voltage dividing module 20, and the common end of the third resistor and the fourth resistor is a current sampling output end of the voltage dividing module 20.
In this embodiment, the current detection device may be specifically as shown in fig. 3, and fig. 3 is a schematic circuit structure diagram of an embodiment of the current detection device. The voltage dividing module 20 includes a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4, a common end of the first resistor R1 and the second resistor R2 is a first current sampling output end, and a common end of the third resistor R3 and the fourth resistor R4 is a second current sampling output end, that is, in this embodiment, the voltage dividing module 20 has two current sampling output ends, that is, the voltage dividing module 20 has two sampling gears. It will be appreciated that the voltage value at the first current sample output is greater than the voltage value at the second current sample output, and therefore the range of the second current sample output is greater than the range of the first current sample output. Specifically, in an embodiment, the sampling ranges of the first current sampling output terminal and the second current sampling output terminal of the voltage divider module 20 are-60A to +60A, and-200A to +200A, respectively. Further, the voltage dividing resistor of the voltage dividing module 20 can also adopt a high-precision low-temperature sheet film resistor for sampling, so that the precision of current sampling can be further improved.
Referring to fig. 1 to 4, in an embodiment, the current detection apparatus further includes:
sampling control module 40 has a plurality of first control ends, a plurality of first control ends of sampling control module 40 with a plurality of first controlled ends one-to-one of gear selection module 30 are connected, sampling control module 40 is used for receiving outside gear setting signal, and according to gear setting signal control gear selection module 30 communicates corresponding incoming end and output, with the follow select the voltage signal output of target gear in the voltage signal of the different gears of multichannel.
In this embodiment, the sampling control module 40 can receive an external gear setting signal, and control the gear selection module 30 to communicate with the corresponding input terminal and output terminal according to the external gear setting signal, so as to switch the corresponding sampling gear by the voltage division module 20, so that the current-voltage detection value range output by the current sampling output terminal is controlled within a proper sampling range.
In practical applications, the sampling control module 40 may be a main controller in the electrical device, or may be an additional controller dedicated to current detection. The sampling control module 40 can be realized by adopting controllers such as a single chip microcomputer MCU, an FPGA, a DSP and the like, and the sampling control module 40 can establish communication with external terminal equipment, so that the gear selection module 30 is controlled to switch the corresponding sampling gear according to a control instruction issued by the external terminal equipment, and the purpose of multi-gear switching is achieved. For example, when the sampling control module 40 outputs the control signals IN0=0 and IN1=0, the gear selection module 30 selects a channel, i.e., one fixed contact is connected to the first current sampling output terminal, and the other fixed contact is grounded. With such a configuration, the gear selection module 30 can output two sampling differential signals to the subsequent circuit, so that the subsequent circuit can process the differential signals, thereby further improving the sampling precision. In addition, a toggle switch, a button, a knob and other triggering devices can be arranged on the sampling control module 40, so that a user can manually control the gear selection module 30 to switch sampling gears, and multi-gear manual switching is realized. Further, the output end of the gear selection module 30 may be connected to the signal receiving end of the sampling control module 40, so that the gear selection module 30 sends the current-voltage detection value to the sampling control module 40, and the sampling control module 40 further performs sampling processing and then outputs the result to an external terminal device, thereby further improving the resolution and accuracy of sampling.
Optionally, the sampling control module 40 further has a plurality of second control terminals:
the plurality of second control ends of the sampling control module 40 are connected with the plurality of second controlled ends of the gain amplification module 50 in a one-to-one correspondence manner, and the sampling control module 40 is further configured to control the gain amplification module 50 to amplify the voltage signal of the target gear by a target amplification factor and then output a voltage signal to be detected according to the gear setting signal.
In this embodiment, the gain amplifying module 50 may achieve amplification of different times such as 1, 10, 100, 1000 times by receiving the control signal transmitted by the sampling control module 40, for example, in an embodiment, the control signal output by the sampling control module 40 is A0=0 and A1=0, at this time, the gain amplifying module 50 amplifies by 1 time, and amplifies the current-voltage detection value output by the gear selection module 30 and then outputs the voltage signal to be measured to a subsequent stage. So set up, the current sampling of different gears corresponds different magnification, and the difference input is to gain amplification module 50 behind the current-voltage detection value passing through gear selection module 30 to carry out the adjustment of different gains, thereby reach the benefit of stepping, then will handle the high accuracy signal output that obtains to the back stage, can improve current detection circuit's sampling precision.
Referring to fig. 1 to 4, in an embodiment, the current detection apparatus further includes:
and the input end of the differential driving module 60 is connected with the output end of the gain amplification module 50, and the differential driving module 60 is used for outputting the voltage signal to be detected as a differential signal.
In this embodiment, the differential driving module 60 can convert the voltage signal to be measured output by the gain amplifying module 50 into a differential signal and output the differential signal. Preferably, the differential driving module 60 may be an MFB low-pass filter circuit composed of a high-performance operational amplifier, that is, a single-ended to differential circuit, which may be specifically shown in fig. 3, where fig. 3 is a schematic circuit structure diagram of an embodiment of a current detection device. The differential driving module 60 is composed of a comparator U3, a capacitor resistor and other components, wherein the signal VI enters the MFB low-pass filter circuit from the seventh resistor R7, and the signals Vop and Von are obtained after the inverse gain and offset processing. The input and output relationship of the circuit is as follows, delta V = Vop-Von = -2 VI, wherein Vop and Von are respectively used for connecting the positive input end and the negative input end of the signal conversion circuit at the later stage, so as to reach a differential driving mode, thereby reducing the influence of common mode voltage, and further improving the accuracy of current sampling.
Referring to fig. 1 to 4, in an embodiment, the current detection apparatus further includes:
and the input end of the sampling conversion module 70 is connected with the output end of the gain amplification module 50, and the sampling conversion module 70 is used for performing digital-to-analog conversion on the voltage signal to be detected and then outputting the voltage signal to be detected.
In an embodiment, the sampling conversion module 70 is configured to perform digital-to-analog conversion on the voltage signal to be measured output by the gain amplification module 50 and output the voltage signal to be measured. The sampling conversion module 70 can be implemented by using an ADC converter U4, and the sampling conversion module 70 can convert the voltage signal to be detected, i.e. the analog signal, conditioned and output by the gain amplification module 50 into a digital signal recognizable by the controller, so as to facilitate the recognition and processing of the system. In addition, the output end of the sampling conversion module 70 may be connected to the signal receiving end of the sampling control module 40, so that the sampling conversion module 70 sends the digital-to-analog converted signal to the sampling control module 40, and the sampling control module 40 further performs sampling processing and then outputs the signal to an external terminal device, thereby further improving the resolution and precision of sampling.
In another embodiment, the current detection device is further provided with a reference voltage circuit for providing a reference voltage for the sampling conversion module 70, the reference voltage circuit can be implemented by an LDO circuit or a voltage source, and the reference voltage circuit can provide a stable reference voltage for the sampling conversion module 70, so that the sampling conversion module 70 can accurately perform digital-to-analog conversion on the current-voltage detection value according to the reference voltage provided by the reference voltage circuit, thereby reducing an ADC conversion error and improving the sampling precision and resolution.
Referring to fig. 1-4, in one embodiment, the sample conversion module 70 includes:
and a plurality of sampling conversion branches, wherein the input ends of the sampling conversion branches are connected with the output end of the gain amplification module 50, and the sampling conversion branches are used for performing digital-to-analog conversion on the voltage signal to be detected and then outputting the voltage signal to be detected.
The sampling conversion module 70 may have a plurality of sampling conversion branches to perform synchronous sampling and oversampling processing on the voltage signal to be detected output by the gain amplification module 50, so as to improve the effective number of samples, thereby further improving the sampling precision and resolution.
In an embodiment, the number of the sampling conversion branches is two, specifically, as shown in fig. 4, fig. 4 is a schematic circuit structure diagram of an embodiment of the sampling conversion module 70, and the sampling conversion module 70 includes two ADC converters U4 and U5. Signals Vop and Von output by the MFB low-pass filter circuit are differentially input into the two sampling conversion branches, and the working mode of a three-wire system interface or a four-wire system interface can be selectively configured by controlling pins of the SCK, the SDI and the CNV. In this embodiment, two 18-bit SAR ADC modules with high speed, high precision and superior performance are used to perform synchronous sampling and oversampling, so that the effective number of samples can be increased, the conversion error can be further reduced, and the sampling precision and resolution can be further increased.
Referring to fig. 1 to 4, in an embodiment, the current detection apparatus further includes:
and the input end of the signal buffering module 80 is connected with the output end of the gain amplification module 50, and the signal buffering module 80 is used for buffering the voltage signal to be detected and then outputting the buffered voltage signal.
It can be understood that the signal waveform is easily deformed in a high frequency state, and the controller is easily read an error when reading a rising edge or a falling edge, so in an embodiment, the signal buffering module 80 is further provided in the current detection apparatus to buffer the signal output by the sampling conversion module 70 and output the buffered signal. The signal buffering module 80 may be implemented by using a signal buffer, for example, an SN74LVC1G17 single schmitt trigger buffer may be used to perform signal shaping, so as to further improve the quality of the current sampling signal, reduce the ADC conversion error, and improve the sampling precision and resolution.
Referring to fig. 1 to 4, in an embodiment, the current detection apparatus further includes:
and the output end of the sampling module 10 is connected with the input end of the voltage division module 20 and is used for collecting the current to be measured by utilizing the Hall sensor.
In this embodiment, the current detection apparatus further includes a sampling module 10, the sampling module 10 is used to collect the current to be detected, the sampling module 10 may be composed of a current sensor such as a hall sensor, the hall sensor is a magnetic field sensor manufactured according to the hall effect, and the hall sensor may measure the current and voltage of any waveform, such as: direct current, alternating current, pulse waveforms, etc., and even measurements of transient peaks. The Hall sensor has the advantages of good electrical isolation, high precision, good linearity, wide bandwidth, large measurement range and the like, and can effectively improve the accuracy and stability of current detection.
The utility model also provides an electrical equipment, this electrical equipment include foretell current detection device, and this current detection device's concrete structure refers to above-mentioned embodiment, because this electrical equipment has adopted the whole technical scheme of above-mentioned all embodiments, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, and the repeated description is no longer given here.
The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made by the contents of the specification and the drawings under the inventive concept of the present invention, or the direct/indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims (10)
1. A current sensing device, comprising:
the voltage division module comprises a plurality of voltage division subunits and a plurality of current sampling output ends, and is used for collecting current to be detected, converting the current to be detected into a plurality of paths of voltage signals of different gears through the voltage division subunits and outputting the voltage signals;
the gear selection module is provided with a plurality of first controlled ends and a plurality of input ends, the plurality of input ends of the gear selection module are connected with the plurality of current sampling output ends of the voltage division module in a one-to-one correspondence manner, the plurality of input ends are used for receiving a plurality of paths of voltage signals of different gears output by the voltage division module, and the gear selection module is used for selecting a voltage signal of a target gear from the plurality of paths of voltage signals of different gears to output according to gear setting signals received by the plurality of first controlled ends;
the gain amplification module is provided with a plurality of second controlled ends, the input end of the gain amplification module is connected with the output end of the gear selection module, and the gain amplification module is used for determining a target amplification factor corresponding to the target gear based on the gear setting signals received by the second controlled ends, amplifying the voltage signal of the target gear according to the target amplification factor and outputting a voltage signal to be detected; wherein the voltage signal to be measured is used to determine the value of the current to be measured by calculation.
2. The current sensing device of claim 1, further comprising:
the sampling control module is provided with a plurality of first control ends, the plurality of first control ends of the sampling control module are connected with the plurality of first controlled ends of the gear selection module in a one-to-one correspondence mode, the sampling control module is used for receiving an external gear setting signal and controlling the gear selection module to communicate the corresponding access end and output end according to the gear setting signal, and therefore the voltage signals of the target gear are selected from the voltage signals of the multiple different gears to be output.
3. The current sensing device of claim 2, wherein the sampling control module further has a plurality of second control terminals:
the sampling control module is used for controlling the gain amplification module to amplify the voltage signal of the target gear by a target amplification factor and then output a voltage signal to be detected.
4. The current sensing device of claim 1, further comprising:
and the input end of the differential driving module is connected with the output end of the gain amplification module, and the differential driving module is used for converting the voltage signal to be detected into a differential signal and then outputting the differential signal.
5. The current sensing device of claim 1, further comprising:
and the input end of the sampling conversion module is connected with the output end of the gain amplification module, and the sampling conversion module is used for performing digital-to-analog conversion on the voltage signal to be detected and then outputting the voltage signal to be detected.
6. The current sensing device of claim 5, wherein the sample conversion module comprises:
the input end of the sampling conversion branch circuit is connected with the output end of the gain amplification module, and the sampling conversion branch circuit is used for performing digital-to-analog conversion on the voltage signal to be detected and then outputting the voltage signal to be detected.
7. The current sensing device according to claim 1, wherein the current sensing device further comprises:
and the input end of the signal buffering module is connected with the output end of the gain amplification module, and the signal buffering module is used for buffering the voltage signal to be detected and then outputting the buffered voltage signal.
8. The current sensing device according to claim 1, wherein the current sensing device further comprises:
and the output end of the sampling module is connected with the input end of the voltage division module and is used for collecting the current to be measured by utilizing the Hall sensor.
9. The current detection device according to claim 8, wherein the voltage dividing module includes a first resistor, a second resistor, a third resistor, and a fourth resistor, a first end of the first resistor is connected to the sampling module, a second end of the first resistor is connected to ground, a first end of the second resistor is connected to the first end of the first resistor, a first end of the third resistor is connected to the second end of the second resistor, a first end of the fourth resistor is connected to the second end of the third resistor, and the fourth resistor is connected to ground; the common end of the first resistor and the second resistor is a current sampling output end of the voltage division module, and the common end of the third resistor and the fourth resistor is a current sampling output end of the voltage division module.
10. An electrical apparatus, characterized in that it comprises a current detection device according to any one of claims 1-9.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116841341A (en) * | 2023-09-01 | 2023-10-03 | 合肥智芯半导体有限公司 | Multi-voltage generating device, multi-voltage calibration system and chip device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116841341A (en) * | 2023-09-01 | 2023-10-03 | 合肥智芯半导体有限公司 | Multi-voltage generating device, multi-voltage calibration system and chip device |
| CN116841341B (en) * | 2023-09-01 | 2023-12-12 | 合肥智芯半导体有限公司 | Multi-voltage generating device, multi-voltage calibration system and chip device |
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