CN216718531U - Sampling system - Google Patents
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- CN216718531U CN216718531U CN202120980357.6U CN202120980357U CN216718531U CN 216718531 U CN216718531 U CN 216718531U CN 202120980357 U CN202120980357 U CN 202120980357U CN 216718531 U CN216718531 U CN 216718531U
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Abstract
The present application relates to a sampling system, wherein the sampling system comprises: the first end of the inverter circuit is electrically connected with the positive pole of the direct current power supply, the second end of the inverter circuit is electrically connected with the negative pole of the direct current power supply, the third end of the inverter circuit is electrically connected with the component to be powered, and the inverter circuit is used for converting the input direct current into alternating current and supplying power to the component to be powered; the input end of the voltage sampling circuit is electrically connected with the third end of the inverter circuit, and the voltage sampling circuit is used for filtering and sampling the voltage output by the third end of the inverter circuit; and the input end of the current sampling circuit is electrically connected with the second end of the inverter circuit, and the current sampling circuit is used for sampling the current output by the inverter circuit. The application solves the technical problem that the sampling effect of the sampling circuit is poor.
Description
Technical Field
The application relates to the field of circuits, in particular to a sampling system.
Background
With the development of household electrical appliance technology, as an important module of an analog IC, a sampling circuit has been widely applied to household electrical appliances to realize real-time monitoring of various data such as current and voltage, so that an abnormal data signal can be rapidly and correctly transmitted when relevant fault protection such as current protection or voltage protection occurs, so as to assist in accurate fault reporting.
At present, a core module of an existing sampling circuit mainly comprises a high-precision operational amplifier and a high-precision sampling resistor, however, the method can generate serious waveform loss, and further energy loss in the sampling process is caused, and the method can cause overlarge comprehensive cost and poor sampling effect.
In view of the above problems, no effective solution has been proposed.
SUMMERY OF THE UTILITY MODEL
The application provides a sampling system to at least solve the technical problem that the sampling effect of a sampling circuit is poor in the correlation technique.
According to an aspect of an embodiment of the present application, there is provided a sampling system, including: the first end of the inverter circuit is electrically connected with the positive pole of the direct current power supply, the second end of the inverter circuit is electrically connected with the negative pole of the direct current power supply, the third end of the inverter circuit is electrically connected with a component to be powered, and the inverter circuit is used for converting input direct current into alternating current and supplying power to the component to be powered; the input end of the voltage sampling circuit is electrically connected with the third end of the inverter circuit, and the voltage sampling circuit is used for filtering and sampling the voltage output by the third end of the inverter circuit; and the input end of the current sampling circuit is electrically connected with the second end of the inverter circuit, and the current sampling circuit is used for sampling the current output by the inverter circuit.
Optionally, the voltage sampling circuit comprises: a pull-up resistor, a first end of the pull-up resistor being electrically connected to a second end of the inverter circuit; and the first end of the filter sub-circuit is electrically connected with the second end of the pull-up resistor, the second end of the filter sub-circuit is electrically connected with the grounding end, and the filter sub-circuit is used for filtering the voltage output by the inverter circuit and outputting the sampling voltage through the first end of the filter sub-circuit.
Optionally, the filtering sub-circuit comprises: a first end of the pull-down resistor is electrically connected with a second end of the pull-up resistor, and a second end of the pull-down resistor is electrically connected with a ground terminal; and the first end of the output voltage filter capacitor is electrically connected with the second end of the pull-up resistor, and the second end of the output voltage filter capacitor is electrically connected with the grounding end.
Optionally, the filtering frequency value of the filtering sub-circuit is:
wherein, Ffilt_poleIs the filter frequency value, R, of the filter sub-circuitvuIs the resistance value, R, of the pull-up resistorvlIs the resistance value of the pull-down resistor, CvIs the capacitance value of the output voltage filter capacitor.
Optionally, the current sampling circuit comprises: a first end of the shunt resistor is electrically connected with a second end of the inverter circuit, and a second end of the shunt resistor is electrically connected with a ground terminal; and the positive input end of the feedback sub-circuit is electrically connected with the first end of the shunt resistor, and the second end of the feedback sub-circuit is electrically connected with the second end of the shunt resistor.
Optionally, the feedback sub-circuit comprises: a first end of the first input resistor is electrically connected with a second end of the shunt resistor; a first end of the second input resistor is electrically connected with a second end of the shunt resistor; a first end of the first feedback resistor is electrically connected with a second end of the first feedback resistor, and the second end of the first feedback resistor is electrically connected with the ground terminal; the positive input end of the operational amplifier is electrically connected with the first input resistor, and the direction input end of the operational amplifier is electrically connected with the second end of the second input resistor; and a first end of the second feedback resistor is electrically connected with a second end of the second input resistor, and a second end of the second feedback resistor is electrically connected with the output end of the operational amplifier.
Optionally, the inverter circuit includes three bridge inverter sub-circuits connected in parallel, a first end of the bridge inverter sub-circuit is a first end of the inverter circuit connected to the positive pole point of the dc power source, a second end of the bridge inverter sub-circuit is a second end of the inverter circuit electrically connected to the negative pole of the dc power source, and a third end of each bridge inverter sub-circuit is a third end of the inverter circuit.
Optionally, the bridge inverter sub-circuit comprises: the first end of the upper bridge arm is electrically connected with the positive electrode of the direct-current power supply, and the second end of the upper bridge arm is electrically connected with the first end of the lower bridge arm; and the first end of the lower bridge arm is electrically connected with the second end of the upper bridge arm, the second end of the lower bridge arm is electrically connected with the negative electrode of the direct-current power supply, and the first end of the lower bridge arm is the third end of the inverter sub-circuit.
Optionally, the upper bridge arm includes a fully-controlled switching device and a diode connected in anti-parallel with the fully-controlled switching device.
Optionally, the lower bridge arm includes a fully-controlled switching device and a diode connected in anti-parallel with the fully-controlled switching device.
In the embodiment of the application, a first end of the inverter circuit is electrically connected with a positive electrode of a direct current power supply, a second end of the inverter circuit is electrically connected with a negative electrode of the direct current power supply, a third end of the inverter circuit is electrically connected with a component to be powered, and the inverter circuit is used for converting input direct current into alternating current and supplying power to the component to be powered; the input end of the voltage sampling circuit is electrically connected with the third end of the inverter circuit, and the voltage sampling circuit is used for filtering and sampling the voltage output by the third end of the inverter circuit; the input end of the current sampling circuit is electrically connected with the second end of the inverter circuit, the current sampling circuit is used for sampling the current output by the inverter circuit, the inverter circuit connected with a direct current power supply converts direct current into alternating current and supplies power to a part to be powered, the voltage sampling circuit with the filtering and sampling function is electrically connected with the inverter circuit and is used for filtering and sampling the voltage output by the inverter circuit so as to filter noise waves in the voltage output by the inverter circuit and further obtain voltage with stable waveform by sampling, and the current sampling circuit is electrically connected with the inverter circuit so as to sample the current value output by the inverter circuit, the noise waves of the voltage output by the inverter circuit are filtered by the filtering function of the voltage sampling circuit so as to reduce the influence of the noise waves on the sampling effect, the energy loss is reduced, the precision of the sampling circuit is improved, and the purpose of filtering voltage clutter output by the inverter circuit is achieved, so that the technical effect of improving the sampling efficiency of the sampling circuit is achieved, and the technical problem of poor sampling effect of the sampling circuit is solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the utility model and together with the description, serve to explain the principles of the utility model.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a schematic diagram of an alternative sampling system according to an embodiment of the present application;
FIG. 2 is an alternative voltage sampling circuit topology according to an embodiment of the application;
FIG. 3 is an alternative current sampling circuit topology according to an embodiment of the present application;
fig. 4 is an alternative three-phase sampling circuit topology according to an embodiment of the application.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the accompanying drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a list of elements, systems, articles, or devices is not necessarily limited to those elements explicitly listed, but may include other elements not expressly listed or inherent to such process, system, article, or device.
According to an aspect of the embodiments of the present application, there is provided an embodiment of a sampling system.
As an optional embodiment, a first end of the inverter circuit is electrically connected to a positive electrode of a dc power supply, a second end of the inverter circuit is electrically connected to a negative electrode of the dc power supply, a third end of the inverter circuit is electrically connected to a component to be powered, and the inverter circuit is configured to convert an input dc power into an ac power and supply the component to be powered; the input end of the voltage sampling circuit is electrically connected with the third end of the inverter circuit, and the voltage sampling circuit is used for filtering and sampling the voltage output by the third end of the inverter circuit; and the input end of the current sampling circuit is electrically connected with the second end of the inverter circuit, and the current sampling circuit is used for sampling the current output by the inverter circuit.
Alternatively, in the present embodiment, the part to be powered may include, but is not limited to, a compressor, a winding motor, and the like.
Optionally, in this embodiment, the filtering and sampling processing performed by the voltage sampling circuit on the voltage output by the inverter circuit may be filtering the output voltage first and sampling the filtered stable voltage, or may also be sampling the output circuit and filtering the sampled voltage to obtain a filtered stable voltage value, which is not limited in this scheme.
Alternatively, in the present embodiment, the present sampling system may be applied to, but not limited to, a single-phase circuit, a two-phase circuit, a three-phase circuit, and the like.
Optionally, in this embodiment, the number of the voltage sampling circuits in the sampling system may be one group, two groups, or may also be equal to the number of phases of the inverter circuit, for example, when the inverter circuit is a three-phase inverter circuit, the number of the voltage sampling circuits may be one group, two groups, or three groups, when the number of the voltage sampling circuits is one group, the voltage sampling circuits may be connected to the phase lines that need to be sampled according to needs, and when the number of the voltage sampling circuits is three groups, the three groups of the voltage sampling circuits may be connected to the three phase lines of the three-phase sampling circuit respectively, so as to perform filtering sampling processing on the phase line voltage output by the inverter circuit.
Optionally, in this embodiment, the number of the current sampling circuits in the sampling system may be one group, two groups, or may also be equal to the number of phases of the inverter circuit, for example, when the inverter circuit is a three-phase circuit, the number of the current sampling circuits may be one group, two groups, or three groups, when the number of the current sampling circuits is one group, the current sampling circuits may be connected to the phase lines to be sampled according to needs, and when the number of the current sampling circuits is three groups, the current sampling circuits in three groups may be connected to three phase lines of the three-phase sampling circuit respectively, so as to sample the phase line current output by the inverter circuit.
Fig. 1 is a schematic diagram of an alternative sampling system according to an embodiment of the present application, as shown in fig. 1, the sampling circuit comprises a direct current power supply, an inverter circuit, a voltage sampling circuit, a current sampling circuit and a part to be supplied with power, wherein the direct current power supply provided by the direct current power supply is converted into alternating current through the inverter circuit to obtain alternating current output, the alternating current output is connected with a bus to provide an alternating current power supply for the part to be supplied with power, the current sampling circuit is connected with the inverter circuit, the voltage sampling circuit is used for detecting the current output by the inverter circuit to sample the current, the voltage sampling circuit can be connected with the alternating current voltage output end of the inverter circuit and can also be connected with a bus connected with the inverter circuit to a part to be supplied with power, the voltage sampling circuit has the filtering function and can filter the noise wave of the voltage on the bus, and the sampling module is used for carrying out filtering sampling processing on the voltage provided by the inverter circuit to the part to be supplied with power so as to obtain a voltage sampling result on the bus.
Through the above embodiments, the inverter circuit connected with the dc power supply converts the dc power into the ac power and supplies power to the parts to be powered, the voltage sampling circuit with the filtering and sampling function is electrically connected with the inverter circuit to filter and sample the voltage output by the inverter circuit, thereby filtering the noise in the voltage output by the inverter circuit, and further sampling to obtain the voltage with stable waveform, and the current sampling circuit is electrically connected with the inverter circuit to sample the current value output by the inverter circuit, thereby filtering the voltage noise output by the inverter circuit due to the filtering function of the voltage sampling circuit, further reducing the influence of the noise on the sampling effect, reducing the energy loss, improving the precision of the sampling circuit, achieving the purpose of filtering the voltage noise output by the inverter circuit, and further realizing the technical effect of improving the sampling efficiency of the sampling circuit, and then solved the relatively poor technical problem of sampling effect of sampling circuit.
As an alternative embodiment, the voltage sampling circuit includes: a pull-up resistor, a first end of the pull-up resistor being electrically connected to a second end of the inverter circuit; and the first end of the filter sub-circuit is electrically connected with the second end of the pull-up resistor, the second end of the filter sub-circuit is electrically connected with the grounding end, and the filter sub-circuit is used for filtering the voltage output by the inverter circuit and outputting the sampling voltage through the first end of the filter sub-circuit.
Optionally, in this embodiment, the resistance value of the pull-up resistor may be manually adjusted according to actual operating condition requirements of different devices.
Through above embodiment, through set up the filtration subcircuit in voltage sampling circuit to the voltage clutter of output on the filtering busbar, and then improve the degree of accuracy of sampling.
As an alternative embodiment, the filtering sub-circuit comprises: a first end of the pull-down resistor is electrically connected with a second end of the pull-up resistor, and a second end of the pull-down resistor is electrically connected with a ground terminal; and the first end of the output voltage filter capacitor is electrically connected with the second end of the pull-up resistor, and the second end of the output voltage filter capacitor is electrically connected with the grounding terminal.
Optionally, in this embodiment, the resistance value of the pull-down resistor may be manually set according to actual operating condition requirements of different devices.
Optionally, in this embodiment, the capacitance value of the output voltage filter capacitor may be set according to actual operating condition requirements of different devices.
Optionally, in this embodiment, the setting of the feedback voltage in the phase voltage feedback circuit of one phase, the solving of the maximum value of the phase voltage of one phase is performed according to the sampled maximum a/D voltage conversion value, taking the phase a as an example, the maximum voltage value of the phase voltage of the phase a is Va _ max ═ Vadc _ a _ max (R _ max)vl+Rvu)/RvlVadc _ a _ max is an A/D voltage conversion value obtained after voltage sampling, Va _ max is a voltage value output in an inverter circuit, and RvuAs pull-up resistor, RvlIs a pull-down resistor.
Optionally, in this embodiment, a sampling voltage value to be output may be determined by setting a parameter value of an element in the voltage sampling circuit, so as to maintain the sampling voltage value at a fixed value and output a fixed sampling voltage value, for example, in a certain application scenario, the output sampling voltage value is controlled to be 3.3V ADC, and a pull-up resistance value, a pull-down resistance value and a capacitance value in the sampling circuit are adjusted, so as to maintain the sampling voltage at a stable output value.
As an alternative embodiment, the filter frequency value of the filter sub-circuit is:
wherein, F isfilt_poleFor said filter frequency value of said filter sub-circuit, said RvuIs a resistance value of the pull-up resistor, RvlIs the resistance value of the pull-down resistor, CvIs the capacitance value of the output voltage filter capacitor.
Through the parameter setting to each component in the voltage sampling circuit to the realization realizes the setting to the clutter frequency of filter sub-circuit filtering, realizes according to the demand of different equipment, clutter on the high-efficient accurate filtering generating line improves the rate of accuracy of sampling.
Alternatively, in this embodiment, if the optimum harmonic filtering effect of the sampled voltage and current signals is to be set, the poles of the filter sub-circuit need to be set to accurately detect the voltage feedback, and the pole of the filter sub-circuit should be set small enough to filter the PWM signal while allowing the high-speed voltage feedback signal to pass through the filter.
FIG. 2 is an alternative voltage sampling circuit topology according to an embodiment of the application, shown as R in FIG. 2vuAs pull-up resistor, RvlIs a pull-down resistor, CvIs a capacitance, VmRepresenting the output bus sampled voltage measurement, phase voltage filter feedback circuit capacitors are more sensitive to errors and offsets at higher poles, and therefore a trade-off relationship between filtering effectiveness and power loss when setting higher poles needs to be considered.
As an alternative embodiment, the current sampling circuit includes: a first end of the shunt resistor is electrically connected with a second end of the inverter circuit, and a second end of the shunt resistor is electrically connected with a ground terminal; and the positive input end of the feedback sub-circuit is electrically connected with the first end of the shunt resistor, and the second end of the feedback sub-circuit is electrically connected with the second end of the shunt resistor.
Optionally, in this embodiment, the shunt resistor and the device value in the feedback sub-circuit are set according to the actual operating condition requirement of the sampling circuit, so as to obtain the maximum peak current.
As an alternative embodiment, the feedback sub-circuit comprises: a first end of the first input resistor is electrically connected with a second end of the shunt resistor; a first end of the second input resistor is electrically connected with a second end of the shunt resistor; a first end of the first feedback resistor is electrically connected with a second end of the first feedback resistor, and the second end of the first feedback resistor is electrically connected with the ground terminal; the positive input end of the operational amplifier is electrically connected with the first input resistor, and the direction input end of the operational amplifier is electrically connected with the second end of the second input resistor; and a first end of the second feedback resistor is electrically connected with a second end of the second input resistor, and a second end of the second feedback resistor is electrically connected with the output end of the operational amplifier.
Optionally, in this embodiment, the resistance values of the first input resistor and the second input resistor may be fixed or adjustable, and in actual use, the resistance values of the first input resistor and the second input resistor may be set according to sampling requirements of different devices to meet the sampling requirements.
Optionally, in this embodiment, the most significant values of the first feedback resistor and the second feedback resistor may be fixed or adjustable, and in the actual use process, the appropriate resistance values of the first feedback resistor and the second feedback resistor may be manually adjusted or manually selected according to the sampling requirement of the non-stop device, so as to meet the sampling requirement.
FIG. 3 isAn alternative current sampling circuit topology according to an embodiment of the application, as shown in fig. 3, RShA shunt resistor representing a shunt current feedback circuit; i isinRepresenting input current, R, flowing in a shunt current feedback circuitinAn input resistor representing a shunt current feedback circuit; rf represents the feedback resistance of the shunt current feedback circuit, ImRepresenting the sampled current value.
Optionally, in this embodiment, a sampling current value to be output may be determined by setting a parameter value of an element in the current sampling circuit, so as to maintain the sampling current value at a fixed value, for example, in an application scenario, the output sampling current is controlled at 3.3V ADC, and the sampling current may be maintained at a stable output value by manually adjusting the parameter of the element such as a shunt resistor, an input resistor, and a feedback resistor in the sampling circuit.
As an alternative embodiment, the inverter circuit includes three bridge inverter sub-circuits connected in parallel, a first terminal of the bridge inverter sub-circuit is a first terminal of the inverter circuit connected to the positive pole of the dc power source, a second terminal of the bridge inverter sub-circuit is a second terminal of the inverter circuit electrically connected to the negative pole of the dc power source, and a third terminal of each bridge inverter sub-circuit is a third terminal of the inverter circuit.
As an alternative embodiment, the bridge inverter sub-circuit includes: the first end of the upper bridge arm is electrically connected with the positive electrode of the direct-current power supply, and the second end of the upper bridge arm is electrically connected with the first end of the lower bridge arm; and the first end of the lower bridge arm is electrically connected with the second end of the upper bridge arm, the second end of the lower bridge arm is electrically connected with the negative electrode of the direct-current power supply, and the first end of the lower bridge arm is the third end of the inverter sub-circuit.
As an alternative embodiment, the upper bridge arm includes a fully-controlled switching device and a diode connected in anti-parallel with the fully-controlled switching device.
As an alternative embodiment, the lower bridge arm includes a fully controlled switching device and a diode connected in anti-parallel with the fully controlled switching device.
Fig. 4 is an alternative three-phase sampling circuit topology diagram according to an embodiment of the present application, which may be used to sample three-phase input voltage and circuit bus current of a compressor driving system circuit of an air conditioner and output a three-phase input voltage value and a circuit bus current value at the current time in real time through a/D conversion, as shown in fig. 4:
DC power supply VdcThe sampling circuit is provided with direct-current power supply input, direct current is transmitted into a three-phase inverter, the three-phase inverter comprises a first inverter unit, a second inverter unit and a third inverter unit which are connected in parallel, the first inverter unit is used for controlling voltage transformation to be generated on an A-phase bus, the second inverter unit is used for controlling voltage transformation to be generated on a B-phase bus, the third inverter unit is used for controlling voltage transformation to be generated on a C-phase bus, each phase of inverter unit is formed by connecting an upper bridge arm and a lower bridge arm in series, as shown in the figure, the first inverter unit is formed by connecting an upper bridge arm A1 and a lower bridge arm A2 in series, the second inverter unit is formed by connecting an upper bridge arm B1 and a lower bridge arm B2 in series, the third inverter unit is formed by connecting an upper bridge arm C1 and a lower bridge arm C2 in series, voltage transformation is generated on the bus by controlling the on-off of the bridge arm of each phase of inverter unit, and the three-phase of inverter unit supplies power to a bus compressor, the voltage sampling circuit is connected to a bus of the inverter supplying power to the compressor, and each phase of the voltage sampling circuit comprises a pull-up resistor RvuAnd a filter unit connected in series with the pull-up resistor and composed of a pull-down resistor RvlAnd a capacitor C connected in parallel with the pull-down resistorvThe device comprises a filtering unit, a voltage sampling circuit and a control unit, wherein the filtering unit is used for filtering clutter interference on a bus, and element parameters in the voltage sampling circuit are set according to the clutter frequency filtered according to actual needs, so that the filtering unit can filter clutter with specified frequency, and the maximum voltage measurement value V of each phase of the bus after sampling is outputadc_a、Vadc_bAnd Vadc_cThe three-phase sampling circuit also comprises three current sampling circuits, each current sampling circuit is connected to the connection point of the lower bridge arm of each phase inversion unit and the negative pole of the direct-current power supply and is used for detecting the current value of each phase bus, and each current sampling circuit comprises a shunt circuitResistance R of the device partsAnd the amplifying unit is connected with the shunt resistor in parallel, so that the maximum current sampling value on each phase of bus is output.
Through the sampling circuit of the embodiment, the sampling circuit has higher direct-current voltage input, each phase has higher peak output current and higher switching working frequency, the waveform quality of the sampling circuit is improved, and the power loss of the sampling circuit is reduced.
In the sampling system to be protected, each component of the inverter circuit, the voltage sampling circuit, the current sampling circuit, the resistor, the operational amplifier, the processor and the like is a solid product with a determined shape and a determined structure and occupying a certain space. Electronic devices such as operational amplifiers, resistors, and the like; or, the processor and the like are computer devices, terminals or servers having specific hardware structures that can be independently operated.
The foregoing is only a preferred embodiment of the present application and it should be noted that those skilled in the art can make several improvements and modifications without departing from the principle of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.
Claims (10)
1. A sampling system, comprising:
the first end of the inverter circuit is electrically connected with the positive pole of the direct current power supply, the second end of the inverter circuit is electrically connected with the negative pole of the direct current power supply, the third end of the inverter circuit is electrically connected with a component to be powered, and the inverter circuit is used for converting input direct current into alternating current and supplying power to the component to be powered;
the input end of the voltage sampling circuit is electrically connected with the third end of the inverter circuit, and the voltage sampling circuit is used for filtering and sampling the voltage output by the third end of the inverter circuit;
and the input end of the current sampling circuit is electrically connected with the second end of the inverter circuit, and the current sampling circuit is used for sampling the current output by the inverter circuit.
2. The sampling system of claim 1, wherein the voltage sampling circuit comprises:
a pull-up resistor, a first end of the pull-up resistor being electrically connected to a second end of the inverter circuit;
and the first end of the filter sub-circuit is electrically connected with the second end of the pull-up resistor, the second end of the filter sub-circuit is electrically connected with the grounding end, and the filter sub-circuit is used for filtering the voltage output by the inverter circuit and outputting the sampling voltage through the first end of the filter sub-circuit.
3. The sampling system of claim 2, wherein the filtering sub-circuit comprises:
a first end of the pull-down resistor is electrically connected with a second end of the pull-up resistor, and a second end of the pull-down resistor is electrically connected with a ground terminal;
and the first end of the output voltage filter capacitor is electrically connected with the second end of the pull-up resistor, and the second end of the output voltage filter capacitor is electrically connected with the grounding end.
4. The sampling system of claim 3, wherein the filter frequency values of the filter subcircuits are:
wherein, Ffilt_poleIs the filter frequency value, R, of the filter sub-circuitvuIs the resistance value, R, of the pull-up resistorvlIs the resistance value of the pull-down resistor, CvAnd the capacitance value of the output voltage filter capacitor is obtained.
5. The sampling system of claim 1, wherein the current sampling circuit comprises:
a first end of the shunt resistor is electrically connected with a second end of the inverter circuit, and a second end of the shunt resistor is electrically connected with a ground terminal;
and the positive input end of the feedback sub-circuit is electrically connected with the first end of the shunt resistor, and the second end of the feedback sub-circuit is electrically connected with the second end of the shunt resistor.
6. The sampling system of claim 5, wherein the feedback sub-circuit comprises:
a first end of the first input resistor is electrically connected with a second end of the shunt resistor;
a first end of the second input resistor is electrically connected with a second end of the shunt resistor;
a first end of the first feedback resistor is electrically connected with a second end of the first feedback resistor, and the second end of the first feedback resistor is electrically connected with the ground terminal;
the positive input end of the operational amplifier is electrically connected with the first input resistor, and the direction input end of the operational amplifier is electrically connected with the second end of the second input resistor;
and a first end of the second feedback resistor is electrically connected with a second end of the second input resistor, and a second end of the second feedback resistor is electrically connected with the output end of the operational amplifier.
7. The sampling system according to claim 1, wherein the inverter circuit comprises three bridge inverter sub-circuits connected in parallel, a first terminal of the bridge inverter sub-circuit is a first terminal of the inverter circuit connected to a positive terminal of the dc power source, a second terminal of the bridge inverter sub-circuit is a second terminal of the inverter circuit electrically connected to a negative terminal of the dc power source, and a third terminal of each of the bridge inverter sub-circuits serves as a third terminal of the inverter circuit.
8. The sampling system of claim 7, wherein the bridge inverter sub-circuit comprises:
the first end of the upper bridge arm is electrically connected with the positive electrode of the direct-current power supply, and the second end of the upper bridge arm is electrically connected with the first end of the lower bridge arm;
and the first end of the lower bridge arm is electrically connected with the second end of the upper bridge arm, the second end of the lower bridge arm is electrically connected with the negative electrode of the direct-current power supply, and the first end of the lower bridge arm is the third end of the inverter sub-circuit.
9. The sampling system of claim 8, wherein the upper leg comprises a fully controlled switching device and a diode in anti-parallel connection with the fully controlled switching device.
10. The sampling system of claim 8, wherein the lower leg comprises a fully controlled switching device and a diode in anti-parallel connection with the fully controlled switching device.
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| CN (1) | CN216718531U (en) |
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2021
- 2021-05-08 CN CN202120980357.6U patent/CN216718531U/en active Active
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