CN217386229U - Voltage limiting circuit and device - Google Patents
Voltage limiting circuit and device Download PDFInfo
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- CN217386229U CN217386229U CN202220415849.5U CN202220415849U CN217386229U CN 217386229 U CN217386229 U CN 217386229U CN 202220415849 U CN202220415849 U CN 202220415849U CN 217386229 U CN217386229 U CN 217386229U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
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Abstract
The utility model relates to a signal processing technology field discloses a voltage limiting circuit and device, this voltage limiting circuit carries out the partial pressure through first divider resistance and second divider resistance to input signal's voltage, with input signal's voltage control at predetermineeing voltage range, obtain the voltage limiting signal who is applicable to digital analog conversion chip commonly used, and constitute the voltage follower through first operational amplifier, play the isolation, the buffering, improve the effect of taking the carrying capacity, the cost has been practiced thrift when satisfying digital analog conversion chip's commonly used chip voltage requirement.
Description
Technical Field
The utility model relates to a chip interface technical field especially relates to a voltage limiting circuit and device.
Background
With the rapid development of integrated circuits, most analog-to-digital conversion chips (ADs) are widely used. The maximum rated value of the voltage of the signal input port of most analog-to-digital conversion chips is close to AVDD, for example, most analog power supplies are less than 5.5V for common AD with high cost performance. For the AD, when a large-voltage analog signal is processed, the input voltage is limited by designing circuits, and the energy consumption can be reduced while the analog-to-digital conversion chip is protected.
Disclosure of Invention
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.
In view of the above shortcomings of the prior art, the present invention provides a voltage limiting circuit and device to reduce power consumption while protecting the analog-to-digital conversion chip.
The utility model provides a voltage limiting circuit, include: the input signal of the first voltage-dividing resistor is connected with the first end of the first voltage-dividing resistor; the input signal is connected with the positive input end of the first operational amplifier, and the output end of the first operational amplifier is connected with the negative input end of the first operational amplifier; and a first end of the second voltage-dividing resistor is connected with the output end of the first operational amplifier, and a second section of the second voltage-dividing resistor outputs a voltage limiting signal.
Optionally, the first voltage-dividing resistor and/or the second voltage-dividing resistor is a high-precision resistor, and a resistance value range of the high-precision resistor includes 1K Ω to 300K Ω.
Optionally, the voltage limiting circuit further comprises: the signal filtering module is used for respectively connecting a first end of the first voltage-dividing resistor and a positive-phase input end of the first operational amplifier after the input signal passes through the signal filtering module; the signal filtering module is used for filtering the input signal.
Optionally, the signal filtering module comprises: the input signal is connected with the positive-phase input end of the second operational amplifier, and the output end of the second operational amplifier is connected with the negative-phase input end of the second operational amplifier; and a first end of the protection resistor is connected with the output end of the second operational amplifier, and a second end of the protection resistor is respectively connected with a first end of the first voltage-dividing resistor and the positive-phase input end of the first operational amplifier.
Optionally, the voltage value of the voltage limit signal is determined by the following formula:
wherein, V out Is the voltage value, V, of the voltage limiting signal in Is the voltage value, R, of the input signal 1 Is a resistance value, R, of the first resistance unit 3 Is the resistance value of the protection resistor.
Optionally, the first operational amplifier and/or the second operational amplifier is a rail-to-rail operational amplifier.
Optionally, the first operational amplifier and/or the second operational amplifier is an operational amplifier in an OPA2991 operational amplifier chip.
Optionally, the voltage limiting circuit further comprises: the power supply filtering module is used for connecting a power supply to a positive side power supply end of an operational amplifier after the power supply passes through the power supply filtering module, and the operational amplifier comprises at least one of the first operational amplifier and the second operational amplifier; the power supply filtering module is used for filtering the power supply.
Optionally, the power supply filtering module includes: the power supply is connected with the anode of the active capacitor; and the power supply is connected with the first end of the electrodeless capacitor.
The utility model provides a voltage limiting device, voltage limiting device contains foretell circuit.
The utility model has the advantages that: by adopting the voltage limiting circuit provided by the embodiment of the disclosure, the voltage of the input signal is divided by the first voltage dividing resistor, the first operational amplifier and the second voltage dividing resistor, and then the voltage of the input signal is controlled within a preset range, so that the voltage limiting signal applicable to the common analog-to-digital conversion chip is obtained, and the cost is saved.
Drawings
Fig. 1 is a schematic diagram of a voltage limiting circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another voltage limiting circuit according to an embodiment of the present invention.
Reference numerals are as follows:
101: a first voltage dividing resistor; 102: a first operational amplifier; 103: a second voltage dividing resistor; 104: a protection resistor; 105: an active capacitance; 106: an electrodeless capacitor; 107: and an operational amplifier chip.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, in the following embodiments and examples, subsamples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic manner, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the form, amount and proportion of each component may be changed arbitrarily and the layout of the components may be more complicated.
In the following description, numerous details are set forth to provide a more thorough explanation of embodiments of the present invention, however, it will be apparent to one skilled in the art that embodiments of the present invention may be practiced without these specific details, and in other embodiments, well-known structures and devices are shown in block diagram form rather than in detail in order to avoid obscuring embodiments of the present invention.
The terms "first," "second," and the like in the description and claims of the embodiments of the disclosure and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present disclosure described herein may be made. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
The term "plurality" means two or more unless otherwise specified.
In the embodiment of the present disclosure, the character "/" indicates that the preceding and following objects are in an or relationship. For example, A/B represents: a or B.
The term "and/or" is an associative relationship that describes objects, meaning that three relationships may exist. E.g., a and/or B, represents: a or B, or A and B.
With reference to fig. 1, an embodiment of the present disclosure provides a voltage limiting circuit, which includes a first voltage-dividing resistor 101, a first operational amplifier 102, and a second voltage-dividing resistor 103, wherein an input signal is connected to a first end of the first voltage-dividing resistor 101, the input signal is connected to a non-inverting input end of the first operational amplifier 102, an output end of the first operational amplifier 102 is connected to an inverting input end of the first operational amplifier 102, a first end of the second voltage-dividing resistor 103 is connected to an output end of the first operational amplifier 102, and a second segment of the second voltage-dividing resistor 103 outputs a voltage limiting signal.
By adopting the voltage limiting circuit provided by the embodiment of the disclosure, the voltage of the input signal is divided by the first voltage dividing resistor and the second voltage dividing resistor, the voltage of the input signal is controlled within a preset voltage range, the voltage limiting signal suitable for the common digital-to-analog conversion chip is obtained, the voltage follower is formed by the first operational amplifier, the effects of isolating, buffering and improving the carrying capacity are achieved, and the cost is saved while the chip voltage requirement of the common digital-to-analog conversion chip is met.
Optionally, the second terminal of the first divider resistor is grounded.
Optionally, the first voltage-dividing resistor and/or the second voltage-dividing resistor is a high-precision resistor, and a resistance value range of the high-precision resistor includes 1K Ω to 300K Ω.
Optionally, the voltage limiting circuit further comprises: the signal filtering module is used for respectively connecting a first end of the first voltage-dividing resistor and a positive-phase input end of the first operational amplifier after the input signal passes through the signal filtering module; the signal filtering module is used for filtering the input signal. Like this, when input signal access signal filtering module, can carry out signal filtering to input signal, obtain high impedance signal, the interference killing feature of circuit is stronger.
Optionally, the signal filtering module comprises: the input signal is connected with the non-inverting input end of the second operational amplifier, and the output end of the second operational amplifier is connected with the inverting input end of the second operational amplifier; and a first end of the protection resistor is connected with the output end of the second operational amplifier, and a second end of the protection resistor is respectively connected with a first end of the first voltage-dividing resistor and the positive-phase input end of the first operational amplifier.
Optionally, the voltage value of the voltage limit signal is determined by the following formula:
wherein, V out Is the voltage value of the voltage limiting signal, V in Is the voltage value, R, of the input signal 1 Is a resistance value, R, of the first resistance unit 3 Is the resistance value of the protection resistor.
Optionally, the first operational amplifier and/or the second operational amplifier is a rail-to-rail operational amplifier.
Optionally, the first operational amplifier and/or the second operational amplifier is an operational amplifier in an OPA2991 operational amplifier chip.
In some embodiments, the maximum input voltage range of the OPA2991 op-amp chip is 40V, and signals within 40V can be processed by using the rail-to-rail characteristic of the OPA2991 op-amp chip.
Optionally, the voltage limiting circuit further comprises: the power supply filtering module is used for connecting a power supply to a positive side power supply end of an operational amplifier after the power supply passes through the power supply filtering module, and the operational amplifier comprises at least one of the first operational amplifier and the second operational amplifier; the power supply filtering module is used for filtering the power supply.
Optionally, the power supply filtering module includes: the power supply is connected with the anode of the active capacitor; and the power supply is connected with the first end of the electrodeless capacitor.
Optionally, the cathode of the polar capacitor and the second end of the electrodeless capacitor are both grounded.
With reference to fig. 2, an embodiment of the present disclosure provides a voltage limiting circuit, which includes a first voltage-dividing resistor 101, a second voltage-dividing resistor 103, a protection resistor 104, an active capacitor 105, an electroless capacitor 106, and an operational amplifier chip 107, wherein an input signal is connected to a second non-inverting input terminal of the operational amplifier chip 107, a second output terminal of the operational amplifier chip 107 is connected to a second inverting input terminal of the operational amplifier chip 107, a first end of the protection resistor 104 is connected to a second output terminal of the operational amplifier chip 107, a second end of the protection resistor 104 is respectively connected to a first end of the first voltage-dividing resistor 101 and a first non-inverting input terminal of the operational amplifier chip 107, a first output terminal of the operational amplifier chip 107 is connected to a first inverting input terminal of the operational amplifier chip 107, a first end of the second voltage-dividing resistor 103 is connected to a first output terminal of the operational amplifier chip 107, a second end of the second voltage-dividing resistor 103 outputs a voltage limiting signal, and a power supply is respectively connected to an anode, a cathode, an anode, a cathode, and an anode of the electrode of the active capacitor 105, and an anode, and a cathode of the operational amplifier chip 107, and an anode of the protection resistor 107, and a cathode of the protection resistor 103, and a cathode of the output of the protection resistor 103, and a cathode of the power supply circuit, and a cathode of the operational amplifier chip 107, and a cathode of the output a cathode of the output of the operational amplifier chip 107, and a cathode of the output of the operational amplifier chip 107, and a voltage limiting circuit, and a cathode of the output of the operational amplifier chip 107, and a cathode of the output of the, The first end of the electrodeless capacitor 106 and the power input end of the operational amplifier chip 107, the second end of the first divider resistor 101, the cathode of the active capacitor 105 and the second end of the electrodeless capacitor 106 are all grounded.
In some embodiments, the resistance of the first voltage-dividing resistor is 100K Ω, the resistance of the second voltage-dividing resistor is 1K Ω, the resistance of the protection resistor is 300K Ω, the capacitance of the active capacitor is 33uF, the capacitance of the passive capacitor is 100nF, and the operational amplifier chip is an OPA2991 operational amplifier chip.
By adopting the voltage limiting circuit provided by the embodiment of the disclosure, the voltage of the input signal is divided by the first voltage dividing resistor and the second voltage dividing resistor, the voltage of the input signal is controlled within a preset voltage range, the voltage limiting signal suitable for the common digital-to-analog conversion chip is obtained, the voltage follower is formed by the first operational amplifier, the effects of isolating, buffering and improving the carrying capacity are achieved, and the cost is saved while the chip voltage requirement of the common digital-to-analog conversion chip is met. And a voltage following circuit is formed by the operational amplifier, and the input signal is filtered to obtain a high-impedance signal, so that the whole circuit has stronger anti-interference capability.
The embodiment of the disclosure provides a voltage limiting device, which includes the circuit.
By adopting the voltage limiting device provided by the embodiment of the disclosure, the voltage of the input signal is divided by the first voltage dividing resistor and the second voltage dividing resistor, the voltage of the input signal is controlled within a preset voltage range, the voltage limiting signal suitable for the common digital-to-analog conversion chip is obtained, the voltage follower is formed by the first operational amplifier, the effects of isolating, buffering and improving the carrying capacity are achieved, and the cost is saved while the chip voltage requirement of the common digital-to-analog conversion chip is met.
The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and subsamples of some embodiments may be included in or substituted for portions and subsamples of other embodiments. Furthermore, the words used in the specification are words of description only and are not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this application is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, the terms "comprises" and/or "comprising," when used in this application, specify the presence of stated sub-samples, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other sub-samples, integers, steps, operations, elements, components, and/or groups thereof. Without further limitation, an element defined by the phrase "comprising an …" does not exclude the presence of other like elements in a process, method or apparatus that comprises the element. In this document, each embodiment may be described with emphasis on differences from other embodiments, and the same and similar parts between the respective embodiments may be referred to each other. For methods, products, etc. of the embodiment disclosures, reference may be made to the description of the method section for relevance if it corresponds to the method section of the embodiment disclosure.
Those of skill in the art would appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software may depend upon the particular application and design constraints imposed on the technical solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the disclosed embodiments. It can be clearly understood by the skilled person that, for convenience and simplicity of description, the specific working processes of the above-described systems, apparatuses, and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, apparatuses, etc.) may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units may be only one logical division, and there may be other divisions in actual implementation, for example, a plurality of units or components may be combined or may be integrated into another system, or some subsamples may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form. The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to implement the present embodiment. In addition, functional units in the embodiments of the present disclosure may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. In the description corresponding to the flowcharts and block diagrams in the figures, operations or steps corresponding to different blocks may also occur in different orders than disclosed in the description, and sometimes there is no specific order between the different operations or steps. For example, two sequential operations or steps may in fact be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. Each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Claims (10)
1. A voltage limiting circuit, comprising:
the input signal of the first voltage-dividing resistor is connected with the first end of the first voltage-dividing resistor;
the input signal is connected with the positive input end of the first operational amplifier, and the output end of the first operational amplifier is connected with the negative input end of the first operational amplifier;
and a first end of the second voltage-dividing resistor is connected with the output end of the first operational amplifier, and a second section of the second voltage-dividing resistor outputs a voltage limiting signal.
2. The circuit of claim 1, wherein the first voltage divider resistor and/or the second voltage divider resistor is a high precision resistor having a resistance value ranging from 1K Ω to 300K Ω.
3. The circuit of claim 1, wherein the voltage limiting circuit further comprises:
the signal filtering module is used for respectively connecting the first end of the first voltage dividing resistor and the positive phase input end of the first operational amplifier after the input signal passes through the signal filtering module;
the signal filtering module is used for filtering the input signal.
4. The circuit of claim 3, wherein the signal filtering module comprises:
the input signal is connected with the non-inverting input end of the second operational amplifier, and the output end of the second operational amplifier is connected with the inverting input end of the second operational amplifier;
and a first end of the protection resistor is connected with the output end of the second operational amplifier, and a second end of the protection resistor is respectively connected with a first end of the first voltage-dividing resistor and the positive-phase input end of the first operational amplifier.
5. The circuit of claim 4, wherein the voltage value of the voltage limit signal is determined by the following equation:
wherein, V out Is the voltage value, V, of the voltage limiting signal in Is the voltage value, R, of the input signal 1 Is the resistance value, R, of the first divider resistor 3 Is the resistance value of the protection resistor.
6. The circuit of claim 4, wherein the first operational amplifier and/or the second operational amplifier is a rail-to-rail operational amplifier.
7. The circuit of claim 4, wherein the first operational amplifier and/or the second operational amplifier is an operational amplifier in an OPA2991 op-amp chip.
8. The circuit of any of claims 4 to 7, wherein the voltage limiting circuit further comprises:
the power supply filtering module is used for connecting a power supply to a positive side power supply end of an operational amplifier after the power supply passes through the power supply filtering module, and the operational amplifier comprises at least one of the first operational amplifier and the second operational amplifier;
the power supply filtering module is used for filtering the power supply.
9. The circuit of claim 8, wherein the power filtering module comprises:
the power supply is connected with the anode of the active capacitor;
and the power supply is connected with the first end of the electrodeless capacitor.
10. A voltage limiting device, characterized in that it comprises a circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220415849.5U CN217386229U (en) | 2022-02-28 | 2022-02-28 | Voltage limiting circuit and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220415849.5U CN217386229U (en) | 2022-02-28 | 2022-02-28 | Voltage limiting circuit and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217386229U true CN217386229U (en) | 2022-09-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220415849.5U Active CN217386229U (en) | 2022-02-28 | 2022-02-28 | Voltage limiting circuit and device |
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| CN (1) | CN217386229U (en) |
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- 2022-02-28 CN CN202220415849.5U patent/CN217386229U/en active Active
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Address after: No. 7 Liming Road, Longxing Town, Yubei District, Chongqing, 401135 Patentee after: Chongqing Jinxin Meisi Sensor Technology Co.,Ltd. Address before: 401135 No. 618 Liangjiang Avenue, Longxing Town, Yubei District, Chongqing Patentee before: Chongqing Silian Sensor Technology Co.,Ltd. |
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