CN217741703U - Analog signal isolation circuit and isolator - Google Patents
Analog signal isolation circuit and isolator Download PDFInfo
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- CN217741703U CN217741703U CN202221929055.7U CN202221929055U CN217741703U CN 217741703 U CN217741703 U CN 217741703U CN 202221929055 U CN202221929055 U CN 202221929055U CN 217741703 U CN217741703 U CN 217741703U
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Abstract
The present disclosure relates to an analog signal isolation circuit and an isolator, the analog signal isolation circuit includes: the device comprises a transformation ratio module, an input safety module and an isolation transmission module. The transformation ratio module comprises a first input end and a first output end; the input security module comprises a second input end and a second output end; the isolation transmission module comprises a third input end and a third output end; the first output end is electrically connected with the second input end; the second output end is electrically connected with the third input end; the transformation ratio module is used for transforming and outputting the signal received by the first input end to the second input end of the input safety module in a proportion way; the input safety module is used for clamping the voltage of the signal received by the second input end. The method and the device are suitable for data transmission of input signals in a wider voltage range, can also realize instantaneous high pulse, avoid damage to electronic elements and interference, and improve the safety of the circuit.
Description
Technical Field
The present disclosure relates to the field of data transmission technologies, and in particular, to an analog signal isolation circuit and an isolator.
Background
In data transmission, an analog signal isolator is usually used to separate the analog signal 1: 1 to a measuring or collecting device, and simultaneously, the electrical isolation of the transmitting end and the receiving end can be realized. The electric relation between the sending end and the receiving end of the system is isolated in the constructed system, the measuring equipment and the collecting equipment of the receiving end are protected, and mutual interference between the systems or operation faults are avoided. The existing analog signal isolator is generally designed to realize optical coupling isolation, magnetic isolation and VF-FV conversion.
The input signal voltage amplitude of the analog signal isolator is generally allowed to be about +/-12V, and if the input signal contains hundreds of volts or kilovolts of accidental short pulse interference, the device of the isolation circuit is often damaged, and the basic analog signal isolation output function is lost. In addition, the input signals beyond the range cannot be measured, external attenuation needs to be added, especially for multi-channel integrated isolator equipment, the complexity of system construction is increased, and safety, interference and other use problems can be caused.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the present disclosure provides an analog signal isolation circuit and an isolator, which are applicable to data transmission of input signals with a wide voltage range, and can also avoid damage to electronic components and interference due to instantaneous high pulse, thereby improving the safety of the circuit.
In a first aspect, an embodiment of the present disclosure provides an analog signal isolation circuit, including:
the device comprises a transformation ratio module, an input safety module and an isolation transmission module;
the transformation ratio module comprises a first input end and a first output end; the input security module comprises a second input end and a second output end; the isolation transmission module comprises a third input end and a third output end; the first output end is electrically connected with the second input end; the second output end is electrically connected with the third input end;
the transformation ratio module is used for transforming and outputting the signal received by the first input end to the second input end of the input safety module in a proportion way; the input safety module is used for clamping the voltage of the signal received by the second input end.
In some embodiments, the transformation ratio module comprises a switch unit, a reference resistor and a plurality of voltage dividing resistors;
the switch unit is electrically connected with the first end of each voltage-dividing resistor respectively; a second end of each voltage-dividing resistor is electrically connected with a first end of the reference resistor; the second end of the reference resistor is grounded; the first end of the reference resistor is electrically connected with the second input end of the input safety module;
the switch unit is used for selecting a conduction path between the first input end and each voltage-dividing resistor;
the resistance values of the voltage dividing resistors are different.
In some embodiments, the input security module comprises at least one first bidirectional electrostatic diode;
the first end of the first bidirectional electrostatic diode is electrically connected with the second input end of the input safety module; a second end of the first bidirectional electrostatic diode is grounded;
the bidirectional electrostatic diode is used for clamping the voltage of the signal received by the second input end of the input safety module.
In some embodiments, the input security module further comprises: a first operational amplifier;
the non-inverting input end of the first operational amplifier is electrically connected with the first end of the first bidirectional electrostatic diode respectively; the inverting input end of the first operational amplifier is grounded; the output end of the first operational amplifier is electrically connected with the second output end of the input safety module.
In some embodiments, the input security module further comprises: at least one second bidirectional electrostatic diode;
a first end of the second bidirectional electrostatic diode is electrically connected with an output end of the first operational amplifier; a second terminal of the second bidirectional electrostatic diode is grounded;
the second bidirectional electrostatic diode is used for clamping the voltage of the signal received by the output end of the first operational amplifier.
In some embodiments, the input security module further comprises: at least one first low-pass filter;
the input end of the first low-pass filter is electrically connected with the second input end of the input security module; the output end of the first low-pass filter is electrically connected with the first end of the first bidirectional electrostatic diode and the second output end of the input safety module respectively.
In some embodiments, further comprising an output security module;
the output safety module comprises a fourth input end and a fourth output end; the fourth input end is electrically connected with the third output end; the output safety module is used for clamping the voltage of the signal received by the fourth input end.
In some embodiments, the output safety module comprises a third bi-directional electrostatic diode;
the first end of the third bidirectional electrostatic diode is electrically connected with the fourth input end of the output safety module; a second end of the third bidirectional electrostatic diode is grounded;
the third bidirectional electrostatic diode is used for clamping the voltage of the signal received by the fourth output end of the output safety module.
In some embodiments, the output security module further comprises a second low pass filter;
the input end of the second low-pass filter is electrically connected with the fourth input end of the output safety module; and the output end of the second low-pass filter is respectively and electrically connected with the first end of the third bidirectional electrostatic diode and the fourth output end of the output safety module.
In a second aspect, embodiments of the present disclosure further provide an analog signal isolator, including the analog signal isolation circuit according to any embodiment of the first aspect.
Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:
the analog signal isolation circuit in the present disclosure includes a transformation ratio module, an input security module, and an isolation transmission module. The transformation ratio module is used for transforming and outputting the signal received by the first input end to a second input end of the input safety module, and the input safety module is used for clamping the voltage of the signal received by the second input end. After the first input end of the ratio conversion module receives an input signal, the voltage ratio of the input signal is adjusted to enable the input signal to be output to the input safety module according to the ratio, and the input safety module clamps the voltage of the input signal to absorb an interference signal which is generated in the input signal and has a high instantaneous voltage and a high frequency spectrum, so that an electronic element is damaged. The method is suitable for data transmission of input signals in a wider voltage range, can also realize instantaneous high pulse, avoids damage to electronic elements and interference, and improves the safety of the circuit.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the embodiments or technical solutions in the prior art description will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic structural diagram of an analog signal isolation circuit according to an embodiment of the disclosure;
FIG. 2 is a schematic structural diagram of a ratio-changing module according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of an input security module according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of an output security module according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of another analog signal isolation circuit provided in the embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of another analog signal isolation circuit provided in the embodiment of the present disclosure.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.
The embodiment of the present disclosure provides an analog signal isolation circuit, and fig. 1 is a schematic structural diagram of an analog signal isolation circuit diagram provided by the embodiment of the present disclosure. As shown in fig. 1, an analog signal isolation circuit 10 provided in the embodiment of the present disclosure includes: a transformation ratio module 11, an input security module 12 and an isolated transmission module 13.
The transformation ratio module 11 includes a first input 111 and a first output 112, the input security module 12 includes a second input 121 and a second output 122, and the isolated transmission module 13 includes a third input 131 and a third output 132. The first output terminal 112 is electrically connected to the second input terminal 121, and the second output terminal 122 is electrically connected to the third input terminal 131.
The transformation ratio module 11 is configured to transform the signal received by the first input terminal 111 into a transformation ratio and output the transformation ratio to the second input terminal 121 of the input security module 12, and the input security module 12 is configured to clamp the voltage of the signal received by the second input terminal 121.
The first input end 111 of the transformation ratio module 11 receives an input signal, and the transformation ratio module 11 adjusts the voltage value of the signal to meet the working voltage range in the analog signal isolation circuit. The input signal provided by the signal input module is not limited, and can also be a signal with a higher voltage, the magnitude of the signal voltage is adjusted by the transformation ratio module 11, so that the working voltage range of the analog signal isolation circuit can be met, the circuit operation cannot be influenced by the overlarge signal voltage provided by the signal input module, and the signal input module is suitable for data transmission of the input signal with a wider voltage range. The adjusted signal is transmitted to the second input terminal 121 of the input security module 12 via the first output terminal 112 of the transformation ratio module 11, and the input security module 12 clamps the voltage of the signal received by the second input terminal 121, and absorbs the transient high voltage and the interference signal with higher frequency spectrum generated by the signal. And the second output end 122 of the input security module 12 is transmitted to the third input end 131 of the isolation transmission module 13, the isolation output module 13 isolates the signal, and finally the signal is output through the third output end 132 of the isolation output module 13, so as to isolate the connection between the signal input end and the output end of the analog signal isolation circuit, thereby preventing mutual interference between the two sides or circuit failure.
According to the embodiment of the disclosure, the voltage value of the input signal is adjusted through the ratio changing module, after the first input end of the ratio changing module receives the input signal, the voltage ratio of the input signal is adjusted, the input signal is output to the input safety module according to the ratio, the input safety module performs voltage clamping on the input signal, and the generated instantaneous high voltage and the interference signal with a higher frequency spectrum are absorbed, so that the electronic element is damaged. The method and the device are suitable for data transmission of input signals in a wider voltage range, can also realize instantaneous high pulse, avoid damage to electronic elements and interference, and improve the safety of the circuit.
In some embodiments, fig. 2 is a schematic structural diagram of a ratio changing module provided in an embodiment of the present disclosure. As shown in fig. 2, the transformation ratio module 11 includes a switch unit 113, a reference resistor 114, and a plurality of voltage dividing resistors. In fig. 2, 4 voltage dividing resistors, which are respectively denoted by R1, R2, R3, and R4, are exemplarily provided.
The switch unit 113 is electrically connected to a first end of each voltage-dividing resistor, a second end of each voltage-dividing resistor 115 is electrically connected to a first end of the reference resistor 114, a second end of the reference resistor 114 is grounded, and a first end of the reference resistor 114 is electrically connected to a second input terminal 121 of the input security module 12.
The switch unit 113 is used to select a conducting path between the first input end 111 and each voltage-dividing resistor, and the resistance values of the voltage-dividing resistors are different.
The input end of the switch unit 113 is electrically connected to the first input end 111 of the ratio-changing module 11, and after the signal enters the switch unit 113, the signal is routed through the switch unit 113. The output end of the switch unit 113 is connected to the first end of each voltage-dividing resistor, the resistance values of the voltage-dividing resistors 115 are different, and the second end of each voltage-dividing resistor is electrically connected to the first end of the reference resistor 114. Fig. 2 exemplarily sets 4 voltage dividing resistors, which respectively correspond to 4 conducting paths, and the paths in the selection switch unit 113 are conducted according to actual conditions to output signals to the first output terminal 112. For example, if it is necessary to select a conductive path corresponding to the voltage dividing resistor R1, voltage is divided by the voltage dividing resistor R1, and a signal flows out through the voltage dividing resistor R1. A first terminal of the reference resistor 114 is electrically connected to the first output terminal of the scaling module, and a second terminal of the reference resistor 114 is grounded. When the signal is outputted through the switch unit 113, the voltage values of the signal outputted from the conducting paths corresponding to the voltage dividing resistors are different due to the difference in resistance values of the voltage dividing resistors. Therefore, after the signals with different voltages are input, the conducting path can be selected to transmit the signals to the first output end 112 according to the voltage value of the signals to be output. The switch unit 113 may be manually adjusted to select a proper conduction path to implement variable-ratio output of the signal, or the switch unit 113 may be controlled by a control signal to select a required conduction path, and a control mode of the switch unit is set according to actual requirements, which is not limited in this disclosure.
Illustratively, four voltage dividing resistors, R1, R2, R3, and R4, and a reference resistor R5 are provided, where R1 has a resistance value of 200k Ω, R2 has a resistance value of 100k Ω, R3 has a resistance value of 50k Ω, R4 has a resistance value of 0 Ω, and R5 has a resistance value of 1k Ω. If the voltage of the input signal is U and the conduction path corresponding to R2 is selected, the voltage value U' = R5 × U/(R2 + R5) corresponding to the signal output to the first output terminal 112. The voltage value of the signal input to the first input end 111 of the ratio-change module 11 does not need to be limited, and the voltage selection of the signal can be adjusted to different ratio outputs through the switch unit 113.
It should be noted that, the resistance values of the voltage dividing resistor and the reference resistor may be set according to actual requirements, and the number of the voltage dividing resistors is not limited.
In some embodiments, fig. 3 is a schematic structural diagram of an input security module according to an embodiment of the present disclosure. As shown in fig. 3, the input security module 12 includes at least one first bidirectional electrostatic diode 123.
A first terminal of the first bidirectional electrostatic diode 123 is electrically connected to the second input terminal 121 of the input security module 12, and a second terminal of the first bidirectional electrostatic diode 123 is grounded.
The first bidirectional electrostatic diode 123 is used for voltage clamping a signal received by the second input terminal 121 of the input security module 12.
The first terminal of the first bidirectional electrostatic diode 123 receives the signal transmitted through the second input terminal 121 of the input security module 12, and the first bidirectional electrostatic diode 123 can clamp the voltage in the signal, so as to prevent the transient voltage and the power of the signal from excessively breaking down electronic components in the circuit. A plurality of first bidirectional electrostatic diodes 123 may also be provided, and when the interference is too large, the plurality of bidirectional electrostatic diodes 123 can clamp signals respectively, so as to ensure safe use of the circuit.
In some embodiments, fig. 3 is a schematic structural diagram of an input security module according to an embodiment of the present disclosure. As shown in fig. 3, the input security module 12 further includes: a first operational amplifier 124.
The non-inverting input 241 of the first operational amplifier 124 is electrically connected to the first end of the first bidirectional electrostatic diode 123, and the inverting input 242 of the first operational amplifier 124 is electrically connected to the output 243 of the first operational amplifier 124 and the second output 122 of the input security module.
After being processed by the first bidirectional electrostatic diode 123, the signal is transmitted to the non-inverting input end 241 of the first operational amplifier 124, and is transmitted to the second output end 122 of the input security module from the output end 243 of the first operational amplifier. The output 243 of the first operational amplifier 124 simultaneously feeds back a signal to the inverting input 242 of the first operational amplifier 124, constituting a negative feedback circuit. The first operational amplifier 124 can increase the input impedance and the output impedance, reduce the output impedance, prevent the front-end circuit from affecting the isolated output module 13, and prevent the linear relationship between the signal output and the input of the isolated output module 13 from deviating, so that the result is more accurate.
In some embodiments, fig. 3 is a schematic structural diagram of an input security module according to an embodiment of the present disclosure. As shown in fig. 3, the input security module 12 further includes: at least one second bidirectional electrostatic diode 125.
A first terminal of the second bidirectional electrostatic diode 125 is electrically connected to the output terminal 243 of the first operational amplifier 124, and a second terminal of the second bidirectional electrostatic diode is grounded.
The second bi-directional electrostatic diode 125 is used to voltage clamp the signal received at the output of the first operational amplifier 124.
The first terminal of the second bi-directional electrostatic diode 125 receives the signal outputted through the output terminal 243 of the first operational amplifier 124, and the second bi-directional electrostatic diode 125 can clamp the voltage of the signal, so as to further protect the circuit and prevent the transient voltage and power of the signal from excessively high breakdown of electronic components in the circuit. The processed signal is transmitted to the isolated transmission module 13 via the second output 122 of the input security module 12.
In some embodiments, fig. 3 is a schematic structural diagram of an input security module according to an embodiment of the present disclosure. As shown in fig. 3, the input security module 12 further includes: at least one first low pass filter 126.
An input end of the first low-pass filter 126 is electrically connected to the second input end 121 of the input security module 12, and an output end of the first low-pass filter 126 is electrically connected to a first end of the first bidirectional electrostatic diode 123 and the second output end 122 of the input security module 12, respectively.
The input of the first low-pass filter 126 is electrically connected to the second input 121 of the input security module 12, and filters a specific frequency signal of the signals to prevent interference with the circuit. The first low pass filter includes a first filter resistor 231 and a first filter capacitor 232, wherein the first filter resistor 231 performs current limiting protection on the first bidirectional electrostatic diode 123 at the same time to prevent the first electrostatic diode 123 from being damaged by excessive current.
Illustratively, the bandwidth may be set to 1Hz to 1MHz, such as 468KHz, wherein the resistance value of the first filter resistor 231 is set to 50 Ω, and the capacitance value of the first filter capacitor 232 is set to 6.8nF, so that the undesired signals can be filtered out.
In some embodiments, fig. 4 is a schematic structural diagram of an output security module according to an embodiment of the present disclosure. As shown in fig. 4, an output security module 14 is also included.
The output security module 14 comprises a fourth input 141 and a fourth output 142, the fourth input 141 being electrically connected to the third output 132.
The output security module 14 is used to voltage clamp the signal received at the fourth input 141.
The output security module 14 performs voltage clamping and power limitation on the isolated signal received by the fourth input terminal 141 again, and transmits the isolated signal to the external connection device through the fourth output terminal 142 of the output security module 14, so that the output security module 14 can avoid the signal output through the fourth output terminal 142 from affecting the output port and the subsequent device.
In some embodiments, as shown in fig. 4, the output security module 14 includes a third bi-directional electrostatic diode 143.
A first terminal of the third bidirectional electrostatic diode 143 is electrically connected to the fourth input terminal 141 of the output security module 14, and a second terminal of the third bidirectional electrostatic diode 143 is grounded.
The third diac 143 is used to clamp the voltage of the signal received at the fourth output of the output security module 14.
The first terminal of the third bidirectional electrostatic diode 143 receives the signal input through the fourth input terminal 141 of the output security module 14, and the fourth bidirectional electrostatic diode 143 can clamp the voltage in the signal, so as to further protect the circuit and prevent the transient voltage and power of the signal from excessively high breakdown of electronic components in the circuit. The processed signal is output via the fourth output 142 of the output security module 14, so as to avoid affecting the devices receiving the signal at the back end.
In some embodiments, fig. 4 is a schematic structural diagram of an output security module according to an embodiment of the present disclosure. As shown in fig. 4, the output security module 14 further comprises a second low pass filter 144.
An input terminal of the second low pass filter 144 is electrically connected to the fourth input terminal 141 of the output security module 14, and an output terminal of the second low pass filter 144 is electrically connected to a first terminal of the third bidirectional electrostatic diode 143 and the fourth output terminal 142 of the output security module 14, respectively.
The input of the second low pass filter 144 is electrically connected to the fourth input 141 of the output security module 14, and filters the signal with a specific frequency to prevent interference with the circuit. The second low pass filter includes a second filter resistor 145 and a second filter capacitor 146, wherein the second filter resistor 145 performs current limiting protection on the third bidirectional electrostatic diode 143 at the same time, so as to prevent the third electrostatic diode 143 from being damaged by excessive current.
In some embodiments, fig. 5 is a schematic structural diagram of another analog signal isolation circuit provided in the embodiments of the present disclosure. As shown in fig. 5, a first power module 15 and a second power module 16 are also included. The transformation ratio module 11 and the input security module 12 are powered by a first power module 15, and the output security module 14 is powered by a second power module 16. Since the isolation transmission module 13 is divided into an input terminal and an output terminal by an isolation element (shown by a dotted line in the figure), the input terminal side of the isolation element is supplied with power through the first power module 15, and the output terminal side of the isolation element is supplied with power through the second power module 16. So that the signals are completely isolated in the transmission process, and mutual interference and influence on signal output are avoided.
Illustratively, fig. 6 provides a schematic structural diagram of an analog signal isolation circuit, which includes an isolation transmission module 13. The isolation transmission module 13 provided by the present disclosure realizes the analog signal electro-optic-electrical conversion and restoration process through the linear optical coupler element 350 and the operational amplifier. The adopted linear optical coupling element 350 can be isolated, has high precision and can meet the requirement of isolated transmission of analog signals.
It should be noted that, in the embodiment of the present disclosure, a specific structure of the isolation transmission module is limited, and the kind of the isolation element is also not limited, but is merely exemplary.
Fig. 6 is a schematic structural diagram of another analog signal isolation circuit provided in an embodiment of the present disclosure, which is exemplary as shown in fig. 6, and includes a transformation ratio module 11, an input security module 12, an isolation transmission module 13, and an output security module 14.
The signal input module 17 provides a signal to the transformation ratio module 11, after the signal voltage is adjusted by the transformation ratio module 11, the signal passes through the input safety module 12, the input safety module 12 clamps the voltage, absorbs energy and filters the signal, then the signal is transmitted to the isolation transmission module 13, after the isolation transmission module isolates the signal, the circuit is protected again by the output safety module 14, and finally the signal is transmitted to the signal receiving module 18. Specifically, the signal is transmitted to the switch unit 113 through the first input port 111 of the ratio conversion module 11, and an appropriate conduction path is selected from each voltage-dividing resistor, so that the ratio conversion adjustment is completed. At this time, the signal voltage is output to the second input terminal 121 of the input security module 12 according to the voltage value of the reference resistor. The input safety module 12 is provided with a three-stage first bidirectional electrostatic diode 123 and a three-stage first low-pass filter 126 for voltage clamping and power absorption, as well as filtering and current limiting protection of transient pulses generated in the signal. An operational amplifier 124 is also provided, wherein the positive and negative power terminals of the operational amplifier 124 are connected with the power supply, and a capacitor C2 and a resistor C3 are connected in parallel to protect the circuit. Before the signal is output, the circuit needs to be protected again through the second bidirectional electrostatic diode 125 to prevent the damage to the back-end circuit. Then, the signal is transmitted to the isolation transmission module 13 through the second output terminal 122, where the isolation transmission module 13 is performed by the optical coupler element 350, the isolation resistors 310 and 311 are used for voltage division, the operational amplifier 340 performs voltage comparison through feedback, controls and compares the LED light emitting current in the optical coupler element 350, so that the LED light emitting current can be linearly output, and adjusts the LED light emitting current through the PNP triode 345. And op-amp 342 enables conversion of the current to voltage ratio for comparison by op-amp 340. And a first reference voltage chip 351 is connected to serve as a reference voltage of the input-side diode in the optical coupling element 350. All of which are powered by a first power module 15, not shown. The isolated signal is output to the operational amplifier 343 through the optical coupler 350 for current amplification, and the voltage of the operational amplifier 344 is amplified and set according to actual requirements. The output end of the optical coupling element 350 is also provided with a second reference voltage chip 352, which is used as the reference voltage of the output-end-side diode. The signal is amplified and transmitted to the output security module 14 through the third output terminal, and the output security module 14 is provided with a third bidirectional electrostatic diode 143 and a second low-pass filter 144 to protect the circuit again, so as to prevent the output signal from damaging the signal receiving module 18. One side of the output end of the optical coupler is powered by a second power module 16, which is not shown in the figure. Two power modules can fully isolate signals, prevent interference. The circuit is also provided with a plurality of resistors for circuit protection, and the resistors are arranged according to actual requirements without specific limitation.
The embodiment of the present disclosure further provides an analog signal isolator, which includes the analog signal isolation circuit as described in any of the above embodiments. Therefore, the analog signal isolation circuit has the same or corresponding advantages as the analog signal isolation circuit described in the above embodiments. It should be noted that the analog circuit isolator provided in the embodiment of the present disclosure may further include other circuits and devices for supporting normal operation thereof, and this embodiment is not particularly limited thereto.
It is noted that, in this document, relational terms such as "first" and "second," and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An analog signal isolation circuit, comprising:
the system comprises a transformation ratio module, an input safety module and an isolation transmission module;
the transformation ratio module comprises a first input end and a first output end; the input security module comprises a second input end and a second output end; the isolation transmission module comprises a third input end and a third output end; the first output end is electrically connected with the second input end; the second output end is electrically connected with the third input end;
the transformation ratio module is used for transforming and outputting the signal received by the first input end to the second input end of the input safety module in a proportion way; the input safety module is used for clamping the voltage of the signal received by the second input end.
2. The analog signal isolation circuit of claim 1, wherein the transformation ratio module comprises a switch unit, a reference resistor and a plurality of divider resistors;
the switch units are respectively electrically connected with the first ends of the voltage-dividing resistors; a second end of each voltage-dividing resistor is electrically connected with a first end of the reference resistor; the second end of the reference resistor is grounded; the first end of the reference resistor is electrically connected with the second input end of the input safety module;
the switch unit is used for selecting a conducting path between the first input end and each voltage-dividing resistor;
the resistance values of the divider resistors are different.
3. The analog signal isolation circuit of claim 1, wherein the input security module comprises at least one first bidirectional electrostatic diode;
the first end of the first bidirectional electrostatic diode is electrically connected with the second input end of the input safety module; a second end of the first bidirectional electrostatic diode is grounded;
the bidirectional electrostatic diode is used for clamping the voltage of the signal received by the second input end of the input safety module.
4. The analog signal isolation circuit of claim 3, wherein the input security module further comprises: a first operational amplifier;
the non-inverting input end of the first operational amplifier is electrically connected with the first end of the first bidirectional electrostatic diode respectively; the inverting input end of the first operational amplifier is grounded; the output end of the first operational amplifier is electrically connected with the second output end of the input security module.
5. The analog signal isolation circuit of claim 4, wherein the input security module further comprises: at least one second bidirectional electrostatic diode;
a first end of the second bidirectional electrostatic diode is electrically connected with an output end of the first operational amplifier; a second end of the second bidirectional electrostatic diode is grounded;
the second bidirectional electrostatic diode is used for clamping the voltage of the signal received by the output end of the first operational amplifier.
6. The analog signal isolation circuit of claim 3, wherein the input security module further comprises: at least one first low-pass filter;
the input end of the first low-pass filter is electrically connected with the second input end of the input safety module; the output end of the first low-pass filter is electrically connected with the first end of the first bidirectional electrostatic diode and the second output end of the input safety module respectively.
7. The analog signal isolation circuit of claim 1, further comprising an output security module;
the output safety module comprises a fourth input end and a fourth output end; the fourth input end is electrically connected with the third output end; and the output safety module is used for clamping the voltage of the signal received by the fourth input end.
8. The analog signal isolation circuit of claim 7, wherein the output safety module comprises a third bidirectional electrostatic diode;
the first end of the third bidirectional electrostatic diode is electrically connected with the fourth input end of the output safety module; a second end of the third bidirectional electrostatic diode is grounded;
the third bidirectional electrostatic diode is used for clamping the voltage of the signal received by the fourth output end of the output safety module.
9. The analog signal isolation circuit of claim 8, wherein the output security module further comprises a second low pass filter;
the input end of the second low-pass filter is electrically connected with the fourth input end of the output safety module; and the output end of the second low-pass filter is electrically connected with the first end of the third bidirectional electrostatic diode and the fourth output end of the output safety module respectively.
10. An analog signal isolator comprising an analog signal isolation circuit as claimed in any one of claims 1 to 9.
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|---|---|
| CN (1) | CN217741703U (en) |
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2022
- 2022-07-25 CN CN202221929055.7U patent/CN217741703U/en active Active
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