CN219758378U - Multipath high-precision direct-current voltage isolation sampling circuit - Google Patents
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Abstract
The utility model provides a multipath high-precision direct-current voltage isolation sampling circuit which comprises multipath high-precision direct-current voltage isolation sampling circuits, wherein each path of high-precision direct-current voltage isolation sampling circuit comprises a high-precision voltage sampling circuit, a capacitor charge-discharge switch circuit, a capacitor charge-discharge control circuit, an impedance matching circuit, a high-precision analog-to-digital conversion circuit and a main control circuit. The utility model has the beneficial effects that: the problem that the high-precision isolation detection of multiple paths of direct current voltages in a wide range on the market cannot be realized is solved; the utility model has the advantages of multiple detection paths, wide voltage range, 0-800V of detection direct-current voltage range, high precision, detection precision reaching five thousandths of zero, low cost and wide application in occasions of wide-range direct-current voltage high-precision isolation detection such as communication, an electric power intelligent measurement and control system, a new energy storage battery intelligent control system and the like.
Description
Technical Field
The utility model belongs to the technical field of power electronics, and particularly relates to a multipath high-precision direct-current voltage isolation sampling circuit.
Background
At present, in order to promote the comprehensive green transformation of economic and social development, a novel power system mainly comprising new energy is constructed to meet the national policy planning direction. Therefore, the national powerful new energy industry, along with the rapid development of new energy and the electronization of power equipment, the power system is showing the development trend of 'high-proportion renewable energy' and 'high-proportion power electronic equipment'. On the power generation side, the power grid side and the power utilization side, energy storage becomes a critical ring, is a necessary guarantee for new energy consumption and power grid safety guarantee, and the fine management of an energy storage battery faces new challenges, and the voltage detection is the important aspect of the fine management of the battery, so that how to carry out high-precision isolation detection on multiple paths of wide-range direct current voltages at the same time becomes an urgent problem to be solved.
The utility model aims to solve the problems, and provides a multi-path high-precision direct-current voltage isolation sampling circuit which realizes simultaneous multi-path wide-range direct-current voltage high-precision isolation detection. The method has the advantages of multiple detection paths, wide voltage range, high precision and low cost, and can be widely applied to occasions of wide-range direct-current voltage high-precision isolation detection such as communication, an electric power intelligent measurement and control system, a new energy storage battery intelligent control system and the like.
Disclosure of Invention
In view of this, the present utility model aims to provide a multi-channel high-precision dc voltage isolation sampling circuit, so as to solve the problem that multi-channel wide-range dc voltage high-precision isolation detection cannot be realized in the market at present.
In order to achieve the above purpose, the technical scheme of the utility model is realized as follows:
the utility model provides a multichannel high accuracy direct current voltage isolation sampling circuit, includes multichannel high accuracy direct current voltage isolation sampling circuit, every way high accuracy direct current voltage isolation sampling circuit includes high accuracy voltage sampling circuit, electric capacity charge-discharge switch circuit, electric capacity charge-discharge control circuit, impedance matching circuit, high accuracy analog-to-digital conversion circuit and master control circuit respectively, high accuracy voltage sampling circuit output loops through electric capacity charge-discharge switch circuit, impedance matching circuit and high accuracy analog-to-digital conversion circuit input communication connection, high accuracy analog-to-digital conversion circuit output and master control circuit two-way communication connection, master control circuit output passes through electric capacity charge-discharge control circuit and electric capacity charge-discharge switch circuit input communication connection.
Further, the high-precision voltage sampling circuit comprises a first high-precision sampling resistor, a second high-precision sampling resistor and a third high-precision sampling resistor, one end of the first high-precision sampling resistor is connected with the positive electrode of the high-precision sampling input terminal, the other end of the first high-precision sampling resistor is connected with one end of the third high-precision sampling resistor and one end of the filter capacitor respectively, one end of the second high-precision sampling resistor is connected with the negative electrode of the high-precision sampling input terminal, the other end of the second high-precision sampling resistor is connected with the other end of the third high-precision sampling resistor and the other end of the filter capacitor respectively, and two ends of the filter capacitor are connected with the input ends of the capacitor charge-discharge switch circuit respectively.
Further, the capacitor charge-discharge switch circuit comprises a low ESR charge capacitor, a first high-speed low-impedance electronic switch, a second high-speed low-impedance electronic switch and a plurality of current limiting resistors, an 8 th pin of the first high-speed low-impedance electronic switch and a 5 th pin of the second high-speed low-impedance electronic switch are respectively connected with two ends of the filter capacitor, a 6 th pin and a 7 th pin of the first high-speed low-impedance electronic switch and the second high-speed low-impedance electronic switch are respectively connected with two ends of the low ESR charge capacitor, a 1 st pin and a 3 rd pin of the first high-speed low-impedance electronic switch and the second high-speed low-impedance electronic switch are respectively connected with VCC through one current limiting resistor, a 4 th pin of the first high-speed low-impedance electronic switch and a 2 nd pin of the second high-speed low-impedance electronic switch are respectively connected with a discharge control end of the capacitor charge-discharge control circuit, and a 2 nd pin of the first high-speed low-impedance electronic switch and a 4 th pin of the second high-speed low-impedance electronic switch are respectively connected with a charge control end of the capacitor charge-discharge control circuit.
Further, the capacitor charge-discharge control circuit comprises a first field effect tube, a second field effect tube, a first grid resistor, a second grid resistor, a third grid resistor and a fourth grid resistor, wherein the D electrode of the first field effect tube is connected with the 4 th pin of a first high-speed low-impedance electronic switch and the 2 nd pin of a second high-speed low-impedance electronic switch, the G electrode of the first field effect tube is respectively connected with one end of the first grid resistor and one end of the second grid resistor, and the S electrode of the first field effect tube and the other end of the second grid resistor are grounded;
the D pole of the second field effect tube is connected with the 2 nd pin of the first high-speed low-impedance electronic switch and the 4 th pin of the second high-speed low-impedance electronic switch, the G pole of the second field effect tube is respectively connected with one end of the third grid resistor and one end of the fourth grid resistor, and the S pole of the second field effect tube and the other end of the fourth grid resistor are grounded.
Further, the impedance matching circuit comprises an operational amplifier, an impedance matching resistor, a second impedance matching resistor, a third impedance matching resistor, a fourth impedance matching resistor and an impedance matching capacitor, wherein one end of the first impedance matching resistor is connected with a 5 th pin of a first high-speed low-impedance electronic switch, one end of the second impedance matching resistor is connected with an 8 th pin of a second high-speed low-impedance electronic switch, the other end of the first impedance matching resistor is respectively connected with the 5 th pin of the operational amplifier, one end of the fourth impedance matching resistor and one end of the impedance matching capacitor, the other end of the fourth impedance matching resistor and the other end of the impedance matching capacitor are respectively connected to a 7 th pin of the operational amplifier, the other end of the second impedance matching resistor is respectively connected with one end of the third impedance matching resistor and a 6 th pin of the operational amplifier, and the other end of the third impedance matching resistor is grounded.
Compared with the prior art, the multipath high-precision direct-current voltage isolation sampling circuit has the following advantages:
(1) The multipath high-precision direct-current voltage isolation sampling circuit solves the problem that multipath wide-range direct-current voltage high-precision isolation detection cannot be realized in the market at present; the utility model has the advantages of multiple detection paths, wide voltage range, 0-800V of detection direct-current voltage range, high precision, detection precision reaching five thousandths of zero, low cost and wide application in occasions of wide-range direct-current voltage high-precision isolation detection such as communication, an electric power intelligent measurement and control system, a new energy storage battery intelligent control system and the like.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:
FIG. 1 is a block diagram of a single-channel high-precision DC voltage isolation sampling circuit according to an embodiment of the utility model;
FIG. 2 is a schematic diagram of a multi-channel high-precision DC voltage isolation sampling circuit according to an embodiment of the present utility model;
FIG. 3 is a schematic diagram of a high-precision voltage sampling circuit according to an embodiment of the present utility model;
fig. 4 is a schematic diagram of a capacitor charge-discharge switch circuit according to an embodiment of the utility model;
FIG. 5 is a schematic diagram of a capacitor charge/discharge control circuit according to an embodiment of the present utility model;
FIG. 6 is a schematic diagram of an impedance matching circuit according to an embodiment of the present utility model;
FIG. 7 is a schematic diagram of a high-precision analog-to-digital conversion circuit according to an embodiment of the present utility model;
fig. 8 is a schematic diagram of a master control circuit according to an embodiment of the utility model.
Reference numerals illustrate:
1. a high-precision voltage sampling circuit; 2. a capacitor charge-discharge switching circuit; 3. a capacitor charge and discharge control circuit; 4. an impedance matching circuit; 5. a high-precision analog-to-digital conversion circuit; 6. and a master control circuit.
Detailed Description
It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art in a specific case.
The utility model will be described in detail below with reference to the drawings in connection with embodiments.
As shown in fig. 1 to 8, a multi-path high-precision dc voltage isolation sampling circuit includes: the multi-channel high-precision direct-current voltage isolation sampling circuit comprises a high-precision voltage sampling circuit 1, a capacitor charge-discharge switch circuit 2, a capacitor charge-discharge control circuit 3, an impedance matching circuit 4, a high-precision analog-to-digital conversion circuit 5 and a main control circuit 6, wherein the output end of the high-precision voltage sampling circuit 1 is in communication connection with the input end of the high-precision analog-to-digital conversion circuit 5 sequentially through the capacitor charge-discharge switch circuit 2 and the impedance matching circuit 4, the output end of the high-precision analog-to-digital conversion circuit 5 is in bidirectional communication connection with the main control circuit 6, and the output end of the main control circuit 6 is in communication connection with the input end of the capacitor charge-discharge switch circuit 2 through the capacitor charge-discharge control circuit 3.
The utility model discloses a multipath high-precision direct-current voltage isolation sampling circuit, which solves the problem that multipath wide-range direct-current voltage high-precision isolation detection cannot be realized in the current market; the utility model has the advantages of multiple detection paths, wide voltage range, 0-800V of detection direct-current voltage range, high precision, detection precision reaching five thousandths of zero, low cost and wide application in occasions of wide-range direct-current voltage high-precision isolation detection such as communication, an electric power intelligent measurement and control system, a new energy storage battery intelligent control system and the like.
In a preferred embodiment of the present utility model, when performing voltage detection, each measured voltage passes through the respective high-precision voltage sampling circuit 1 and then reaches the input end of the capacitor charge/discharge switching circuit 2, and the main control circuit 6 charges and discharges the capacitor by controlling the capacitor charge/discharge control circuit 3. When the capacitor is charged, the voltage signal to be measured is stored in the capacitor, and when the capacitor is discharged, the stored signal is input into the high-precision analog-to-digital conversion circuit 5 after impedance matching, and the high-precision analog-to-digital conversion circuit 5 converts the analog signal into a digital signal and then transmits the digital signal to the main control circuit 6, so that the isolation detection of the voltage to be measured is completed.
In a preferred embodiment of the present utility model, the high-precision voltage sampling circuit 1 includes a first high-precision sampling resistor, a second high-precision sampling resistor, and a third high-precision sampling resistor, where one end of the first high-precision sampling resistor is connected to the positive electrode of the high-precision sampling input terminal, the other end of the first high-precision sampling resistor is connected to one end of the third high-precision sampling resistor and one end of the filter capacitor, one end of the second high-precision sampling resistor is connected to the negative electrode of the high-precision sampling input terminal, the other end of the second high-precision sampling resistor is connected to the other end of the third high-precision sampling resistor and the other end of the filter capacitor, and two ends of the filter capacitor are connected to the input ends of the capacitor charge-discharge switch circuit 2.
In this embodiment, the high-precision voltage sampling circuit 1 is composed of a high-precision sampling input terminal, a high-precision sampling output terminal and a plurality of high-precision sampling resistors, the high-precision sampling input terminal is connected with the measured voltage signal, and the high-precision sampling output terminal is connected with the input end of the capacitor charge-discharge switch circuit 2.
In a preferred embodiment of the present utility model, the capacitor charge-discharge switch circuit 2 includes a low ESR charge capacitor, a first high-speed low-impedance electronic switch, a second high-speed low-impedance electronic switch, and a plurality of current limiting resistors, wherein an 8 th pin of the first high-speed low-impedance electronic switch and a 5 th pin of the second high-speed low-impedance electronic switch are respectively connected to two ends of the filter capacitor, a 6 th pin of the first high-speed low-impedance electronic switch, a 7 th pin of the second high-speed low-impedance electronic switch are respectively connected to two ends of the low ESR charge capacitor, a 1 st pin of the first high-speed low-impedance electronic switch, a 3 rd pin of the second high-speed low-impedance electronic switch are respectively connected to VCC through one current limiting resistor, a 4 th pin of the first high-speed low-impedance electronic switch and a 2 nd pin of the second high-speed low-impedance electronic switch are respectively connected to two ends of the filter capacitor charge-discharge control circuit 3, and a 4 th pin of the first high-speed low-impedance electronic switch is respectively connected to two ends of the capacitor charge-discharge control circuit 3.
In this embodiment, the capacitor charge-discharge switch circuit 2 can electrically isolate the detected signal from the stages before and after the signal detection, and the isolation voltage level is greater than or equal to 3000V, and is composed of a high-speed low-impedance electronic switch, a low-ESR charging capacitor and a current-limiting resistor.
In a preferred embodiment of the present utility model, the capacitor charge-discharge control circuit 3 includes a first field effect transistor, a second field effect transistor, a first gate resistor, a second gate resistor, a third gate resistor and a fourth gate resistor, a D electrode of the first field effect transistor is connected to a 4 th pin of a first high-speed low-impedance electronic switch, a 2 nd pin of a second high-speed low-impedance electronic switch, a G electrode of the first field effect transistor is respectively connected to one end of the first gate resistor, one end of the second gate resistor, and an S electrode of the first field effect transistor and the other end of the second gate resistor are both grounded;
the D pole of the second field effect tube is connected with the 2 nd pin of the first high-speed low-impedance electronic switch and the 4 th pin of the second high-speed low-impedance electronic switch, the G pole of the second field effect tube is respectively connected with one end of the third grid resistor and one end of the fourth grid resistor, and the S pole of the second field effect tube and the other end of the fourth grid resistor are grounded.
In this embodiment, the capacitor charge-discharge control circuit 3 is composed of a high withstand voltage low Rdson fet and a gate resistor, and is used for driving the capacitor charge-discharge switch circuit 2.
In a preferred embodiment of the present utility model, the impedance matching circuit 4 includes an operational amplifier, a first impedance matching resistor, a second impedance matching resistor, a third impedance matching resistor, a fourth impedance matching resistor and an impedance matching capacitor, where one end of the first impedance matching resistor is connected to the 5 th pin of the first high-speed low-impedance electronic switch, one end of the second impedance matching resistor is connected to the 8 th pin of the second high-speed low-impedance electronic switch, the other end of the first impedance matching resistor is connected to the 5 th pin of the operational amplifier, one end of the fourth impedance matching resistor and one end of the impedance matching capacitor respectively, the other end of the fourth impedance matching resistor and the other end of the impedance matching capacitor are both connected to the 7 th pin of the operational amplifier, the other end of the second impedance matching resistor is connected to one end of the third impedance matching resistor and the 6 th pin of the operational amplifier respectively, and the other end of the third impedance matching resistor is grounded.
In this embodiment, the impedance matching circuit 4 is a differential impedance matching resistor composed of an operational amplifier with ultra-low input bias voltage and a resistor capacitor, and is used for amplifying and impedance matching the measured voltage signal.
In a preferred embodiment of the present utility model, the high-precision analog-to-digital conversion circuit 5 is a 16-bit high-precision analog-to-digital conversion chip, so as to realize high-precision conversion of analog signals and digital signals.
In a preferred embodiment of the present utility model, the main control circuit 6 is composed of an STM32H7 series microprocessor and a peripheral circuit, and controls the capacitor charge-discharge switch circuit 2 through the capacitor charge-discharge control circuit 3, and reads the collected data by connecting the serial port to the high-precision analog-digital conversion circuit 5. The utility model does not involve program improvement, and all devices used are in the prior art.
When in actual use, the monitoring principle of the multipath high-precision direct-current voltage isolation sampling circuit is as follows:
when voltage detection is executed, each path of detected voltage Vin is respectively connected to an input+ terminal and an input-two-stage terminal of the high-precision voltage sampling circuit 1, a sampling voltage Vo is obtained according to the ratio of vo=1/3×vin, and the sampling voltage Vo is output through the output+ terminal and the output-two-stage terminal of the high-precision voltage sampling circuit 1. The high-precision sampling resistor resistance can be adjusted to obtain the sampling voltage Vo according to actual requirements.
When the sampling voltage Vo reaches the input + and input-of the capacitive charge-discharge circuit 2, capacitive charge and voltage sampling conditions are provided.
Capacitor state of charge: the STM32H7 microprocessor of the main control circuit 6 charges the capacitor charge-discharge control circuit 3 with a high level of the input pin and a low level of the discharge control-input pin, the charging path of the capacitor charge-discharge control circuit 3 is opened, the discharge circuit is closed, the capacitor is charged, the charging time is as long as possible, the capacitor is ensured to be fully charged and stable, and the STM32H7 microprocessor of the main control circuit 6 does not sample the voltage at the moment.
The capacitor is connected with the high-precision voltage sampling circuit 1 and is physically disconnected with the impedance matching circuit 4, the high-precision analog-to-digital conversion circuit 5, the main control circuit 6 and other subsequent circuits, so that the separation of the previous and subsequent circuits in the charging state is realized.
Capacitor discharge state (voltage sampling state): the STM32H7 microprocessor of the main control circuit 6 provides low level for the charge control-input pin and high level for the discharge control-input pin of the capacitor charge-discharge control circuit, the charge path of the capacitor charge-discharge control circuit is closed, and the discharge path is opened, so that the capacitor is discharged, and the discharge time is not required to be long. The discharge current reaches the STM32H7 microprocessor of the main control circuit 6 through the impedance matching circuit 4 and the high-precision analog-to-digital conversion circuit 5, so that voltage sampling is realized.
The capacitor is physically disconnected with the front-stage circuits such as the high-precision voltage sampling circuit 1 and the like in the period of time, and is connected with the rear-stage circuits such as the impedance matching circuit 4, the high-precision analog-to-digital conversion circuit 5, the main control circuit 6 and the like, so that the isolation of the front-stage circuits and the rear-stage circuits in the capacitor discharging state is realized.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (5)
1. A multipath high-precision direct-current voltage isolation sampling circuit is characterized in that: including multichannel high accuracy direct current voltage isolation sampling circuit, every way high accuracy direct current voltage isolation sampling circuit includes high accuracy voltage sampling circuit (1), electric capacity charge-discharge switch circuit (2), electric capacity charge-discharge control circuit (3), impedance matching circuit (4), high accuracy analog-to-digital conversion circuit (5) and main control circuit (6) respectively, high accuracy voltage sampling circuit (1) output loops through electric capacity charge-discharge switch circuit (2), impedance matching circuit (4) and high accuracy analog-to-digital conversion circuit (5) input communication connection, high accuracy analog-to-digital conversion circuit (5) output and main control circuit (6) both-way communication connection, main control circuit (6) output passes through electric capacity charge-discharge control circuit (3) and electric capacity charge-discharge switch circuit (2) input communication connection.
2. The multi-channel high-precision direct-current voltage isolation sampling circuit according to claim 1, wherein: the high-precision voltage sampling circuit (1) comprises a first high-precision sampling resistor, a second high-precision sampling resistor and a third high-precision sampling resistor, one end of the first high-precision sampling resistor is connected with the positive electrode of the high-precision sampling input terminal, the other end of the first high-precision sampling resistor is connected with one end of the third high-precision sampling resistor and one end of the filter capacitor respectively, one end of the second high-precision sampling resistor is connected with the negative electrode of the high-precision sampling input terminal, the other end of the second high-precision sampling resistor is connected with the other end of the third high-precision sampling resistor and the other end of the filter capacitor respectively, and two ends of the filter capacitor are connected with the input ends of the capacitor charge-discharge switch circuit (2) respectively.
3. The multi-channel high-precision direct-current voltage isolation sampling circuit according to claim 2, wherein: the capacitor charge-discharge switch circuit (2) comprises a low ESR charge capacitor, a first high-speed low-impedance electronic switch, a second high-speed low-impedance electronic switch and a plurality of current limiting resistors, wherein an 8 th pin of the first high-speed low-impedance electronic switch and a 5 th pin of the second high-speed low-impedance electronic switch are respectively connected with two ends of the filter capacitor, a 6 th pin and a 7 th pin of the first high-speed low-impedance electronic switch and the second high-speed low-impedance electronic switch are respectively connected with two ends of the low ESR charge capacitor, a 1 st pin and a 3 rd pin of the first high-speed low-impedance electronic switch and the second high-speed low-impedance electronic switch are respectively connected with VCC through one current limiting resistor, a 4 th pin of the first high-speed low-impedance electronic switch and a 2 nd pin of the second high-speed low-impedance electronic switch are respectively connected with a discharge control end of the capacitor charge-discharge control circuit (3), and a 2 nd pin of the first high-speed low-impedance electronic switch and a 4 th pin of the second high-speed low-impedance electronic switch are respectively connected with a charge control end of the capacitor charge-discharge control circuit (3).
4. A multi-channel high precision dc voltage isolated sampling circuit according to claim 3, wherein: the capacitor charge-discharge control circuit (3) comprises a first field effect tube, a second field effect tube, a first grid resistor, a second grid resistor, a third grid resistor and a fourth grid resistor, wherein the D electrode of the first field effect tube is connected with the 4 th pin of a first high-speed low-impedance electronic switch and the 2 nd pin of a second high-speed low-impedance electronic switch, the G electrode of the first field effect tube is respectively connected with one end of the first grid resistor and one end of the second grid resistor, and the S electrode of the first field effect tube and the other end of the second grid resistor are grounded;
the D pole of the second field effect tube is connected with the 2 nd pin of the first high-speed low-impedance electronic switch and the 4 th pin of the second high-speed low-impedance electronic switch, the G pole of the second field effect tube is respectively connected with one end of the third grid resistor and one end of the fourth grid resistor, and the S pole of the second field effect tube and the other end of the fourth grid resistor are grounded.
5. The multi-channel high-precision direct-current voltage isolation sampling circuit according to claim 4, wherein: the impedance matching circuit (4) comprises an operational amplifier, an impedance matching resistor, a second impedance matching resistor, a third impedance matching resistor, a fourth impedance matching resistor and an impedance matching capacitor, wherein one end of the first impedance matching resistor is connected with a 5 th pin of a first high-speed low-impedance electronic switch, one end of the second impedance matching resistor is connected with an 8 th pin of a second high-speed low-impedance electronic switch, the other end of the first impedance matching resistor is respectively connected with the 5 th pin of the operational amplifier, one end of the fourth impedance matching resistor and one end of the impedance matching capacitor, the other end of the fourth impedance matching resistor and the other end of the impedance matching capacitor are respectively connected to a 7 th pin of the operational amplifier, the other end of the second impedance matching resistor is respectively connected with one end of the third impedance matching resistor and a 6 th pin of the operational amplifier, and the other end of the third impedance matching resistor is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320868844.2U CN219758378U (en) | 2023-04-18 | 2023-04-18 | Multipath high-precision direct-current voltage isolation sampling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320868844.2U CN219758378U (en) | 2023-04-18 | 2023-04-18 | Multipath high-precision direct-current voltage isolation sampling circuit |
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|---|---|
| CN219758378U true CN219758378U (en) | 2023-09-26 |
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Family Applications (1)
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| CN202320868844.2U Active CN219758378U (en) | 2023-04-18 | 2023-04-18 | Multipath high-precision direct-current voltage isolation sampling circuit |
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| Country | Link |
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| CN (1) | CN219758378U (en) |
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- 2023-04-18 CN CN202320868844.2U patent/CN219758378U/en active Active
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