Analog output port protection circuit
By setting the protection circuit of the reverse diode and fuse in the analog output circuit, the problem of forward and reverse overvoltage protection of the output port is solved, and the safety and stability of the circuit are achieved.
Patent Information
- Application Number
- CN202421114401.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-21
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-05-21
AI Technical Summary
Existing analog output circuits lack protection when forward or reverse overvoltage occurs on the output port, resulting in unstable and insecure circuits.
An analog output port protection circuit is designed, and the forward voltage withstand and reverse overvoltage protection is achieved by setting two diodes in reverse between the input port and the output port, and connecting the diode and the output port at the positive end of the diode, and connecting the diode and the fuse at the negative end.
This protection circuit ensures circuit safety through the diode's reverse voltage withstand protection when the output port is forward overvoltage; during the reverse overvoltage, the diode current increases, causing the fuse to be disconnected, achieving reverse overvoltage protection, and improving the safety of the analog output port circuit.
Smart Images
Figure CN222868549U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of output circuits, in particular to an analog output port protection circuit. Background Art
[0002] Analog output circuits usually refer to electronic circuits designed to generate continuous electrical signals, which can be voltage, current or other forms of analog signals. They are widely used in various fields, such as audio systems (power amplifiers), data processing equipment (such as ADC / DAC converters), measurement equipment, and industrial control systems. To amplify the input signal to meet the needs of a larger load, op amps (operational amplifiers) are often used to make linear amplifiers that can amplify or attenuate signals while keeping distortion small.
[0003] When the current output circuit outputs a voltage analog signal, it directly outputs the voltage analog signal to the output port. This means that when a forward overvoltage occurs at the output port, the circuit lacks forward voltage protection, and when a reverse overvoltage occurs at the output port, the circuit also lacks reverse overvoltage protection, resulting in an unstable and unsafe circuit.
[0004] In summary, there is a need for an analog output port protection circuit with forward withstand voltage protection and reverse overvoltage protection. Utility Model Content
[0005] In view of the deficiencies in the prior art, the utility model provides an analog output port protection circuit, which solves the problems mentioned in the background technology.
[0006] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:
[0007] The analog output port protection circuit includes an input port, the input port is connected to diode 1 and diode 2, the input port is connected to the positive end of diode 1, the negative end of diode 1 is connected to the output port, diode 1 is used for reverse withstand voltage of forward overvoltage of the output port, the input port is connected to the negative end of diode 2, and the positive end of diode 2 is connected to a fuse.
[0008] Furthermore, the voltage analog signal output by the input port ranges from 0 to 10V.
[0009] Furthermore, the forward withstand voltage protection range of the diode 1 is 50-60V.
[0010] Furthermore, the fuse is a resettable fuse.
[0011] Furthermore, the maximum current range of the fuse resistor is 0.05-2A, and the maximum voltage range is 15-200V.
[0012] The utility model provides an analog output port protection circuit. Compared with the prior art, it has the following beneficial effects:
[0013] 1. By setting two reverse diodes between the input port and the output port, when the output port is over-voltage in the forward direction, the forward voltage protection can be realized by relying on the reverse voltage resistance of the diode, thereby ensuring the safety of the output circuit;
[0014] 2. When the output end is reversely over-voltaged, the current through diode 1 increases instantaneously, causing the fuse to disconnect, thereby achieving reverse over-voltage protection and further improving the safety of the analog output port circuit. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0016] Figure 1 The analog output port protection circuit diagram of the utility model is shown; DETAILED DESCRIPTION
[0017] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model is described clearly and completely. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0018] Embodiment 1
[0019] In order to solve the technical problems in the background technology, the following analog output port protection circuit is provided:
[0020] Combination Figure 1 As shown, the analog output port protection circuit provided by the utility model includes an input port, the input port is connected to a diode 1 and a diode 2, the input port is connected to the positive end of the diode 1, the negative end of the diode 1 is connected to the output port, the diode 1 is used for reverse withstand voltage of the forward overvoltage of the output port, the input port is connected to the negative end of the diode 2, and the positive end of the diode 2 is connected to a fuse;
[0021] According to the above structure, the following effects can be achieved:
[0022] 1. By setting two reverse diodes between the input port and the output port, when the output port is over-voltage in the forward direction, the forward voltage protection can be realized by relying on the reverse voltage resistance of the diode, thereby ensuring the safety of the output circuit;
[0023] 2. When the output end is reversely over-voltaged, the current through diode 1 increases instantaneously, causing the fuse to disconnect, thereby achieving reverse over-voltage protection and further improving the safety of the analog output port circuit.
[0024] In this embodiment, the voltage analog signal output by the input port ranges from 0 to 10V.
[0025] Embodiment 2
[0026] like Figure 1 As shown, based on the above embodiment, this embodiment further provides the following contents:
[0027] The forward withstand voltage protection range of the diode 1 is 50V.
[0028] In this embodiment, the fuse is a resettable fuse.
[0029] In this embodiment, the maximum current range of the fuse resistor is 0.05A, and the maximum voltage range is 15V.
[0030] Embodiment 3
[0031] like Figure 1 As shown, based on the above embodiment, this embodiment further provides the following contents:
[0032] The forward withstand voltage protection range of the diode 1 is 60V.
[0033] In this embodiment, the fuse is a resettable fuse.
[0034] In this embodiment, the maximum current range of the fuse resistor is 2A, and the maximum voltage range is 200V.
[0035] The working principle and use process of this utility model:
[0036] Press first Figure 1 A 10V voltage analog signal is input through the input port A-IN. The diode D1 uses a diode of model BAV99. When the output port A-OUT is forward overvoltage, the diode relies on the reverse withstand voltage, thus achieving a forward withstand voltage protection of up to 60V.
[0037] When the output port A-OUT is reversely over-voltaged, the current through the diode D1 increases instantaneously, and the self-recovery fuse FU1 is disconnected, thus achieving reverse over-voltage protection.
[0038] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.
[0039] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. Analog output port protection circuit, characterized in that: It includes an input port, which is connected to diode 1 and diode 2. The input port is connected to the positive end of diode 1, and the negative end of diode 1 is connected to the output port. Diode 1 is used to withstand the reverse overvoltage of the output port. The input port is connected to the negative end of diode 2, and the positive end of diode 2 is connected to a fuse.
2. The analog output port protection circuit according to claim 1, characterized in that: The voltage analog signal outputted by the input port ranges from 0 to 10V.
3. The analog output port protection circuit according to claim 2, characterized in that: The forward withstand voltage protection range of the diode 1 is 50-60V.
4. The analog output port protection circuit according to claim 3, characterized in that: The fuse is a resettable fuse.
5. The analog output port protection circuit according to claim 1, characterized in that: The maximum current range of the fuse resistor is 0.05-2A, and the maximum voltage range is 15-200V.