CN218733224U - Signal output circuit - Google Patents
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- CN218733224U CN218733224U CN202222468912.4U CN202222468912U CN218733224U CN 218733224 U CN218733224 U CN 218733224U CN 202222468912 U CN202222468912 U CN 202222468912U CN 218733224 U CN218733224 U CN 218733224U
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Abstract
A signal output circuit comprises a signal isolation module, a first input end, a second input end and a third input end, wherein the signal isolation module is provided with an isolation input end and an isolation output end; the rectification filter module is provided with a rectification filter input end and a rectification filter output end, the rectification filter input end is connected with the isolation output end, and the rectification filter module is used for rectifying and filtering signals output by the isolation output end; the feedback adjusting module is provided with a signal input end, a feedback input end and a feedback output end, the signal input end is connected with the rectifying and filtering output end, the feedback input end is connected with the feedback output end, and the feedback output end is used for being connected with a load. The signal isolation module can realize signal isolation between the control module and the output circuit, and damage to the control module caused by lightning surge is avoided. Meanwhile, after the PWM signal is subjected to signal adjustment by utilizing the rectifying and filtering module and the feedback adjusting module, a current signal can be obtained, and the influence caused by external load change is effectively reduced.
Description
Technical Field
The utility model relates to a changer technical field, in particular to signal output circuit.
Background
In the industrial field, for example, in a transmitter, a 4-20mA current signal is commonly used for transmitting information, and the current signal can be used for ensuring the consistency of signals at a signal output end and a signal receiving end, so that noise generated when a voltage signal is transmitted and voltage drop caused by a long-distance cable are avoided. Currently, a separate dc transmitting module or a digital-to-analog converting module is often used for converting output. However, when the conventional transmission module receives an external lightning surge or the like, the control module is easily damaged. In addition, the existing transmission module is easily interfered by external impedance change, and the cost of additionally increasing the correction parameter is required.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a signal output circuit can avoid the damage of thunderbolt surge to control module, can not receive the influence that external load changes simultaneously.
According to the utility model discloses signal output circuit, include:
the signal isolation module is provided with an isolation input end and an isolation output end, and the isolation input end is used for inputting a PWM signal;
the rectification filtering module is provided with a rectification filtering input end and a rectification filtering output end, the rectification filtering input end is connected with the isolation output end, and the rectification filtering module is used for rectifying and filtering signals output by the isolation output end;
the feedback adjusting module is provided with a signal input end, a feedback input end and a feedback output end, the signal input end is connected with the rectifying and filtering output end, the feedback input end is connected with the feedback output end, and the feedback output end is used for being connected with a load.
According to the utility model discloses signal output circuit has following beneficial effect at least:
the signal isolation module can be used for realizing signal isolation between the control module and the output circuit, so that damage to the control module caused by lightning surge of the signal output circuit is avoided, and other functions of the control module can be normally used. Meanwhile, the receiving control module sends the PWM signal, and the rectifying and filtering module and the feedback regulation module are utilized to adjust the received PWM signal, so that the required 4-20mA current signal can be obtained, and the influence caused by external load change can be effectively reduced.
According to some embodiments of the invention, the signal isolation module comprises:
and the optical coupling isolation module is provided with a first input end used for connecting a first working voltage, a second input end used for inputting the PWM signal, a first output end used for connecting a reference ground and a second output end connected with the rectifying and filtering input end.
According to the utility model discloses a some embodiments, the rectification filter module includes:
the first switching power unit is provided with a first controlled end, a first power connecting end and a second power connecting end, the first controlled end is connected with the isolation output end, and the first power connecting end is used for being connected with a reference ground;
the first voltage division circuit is provided with a first voltage connecting end used for connecting a second working voltage, a second voltage connecting end used for connecting a reference ground and a voltage division connecting end connected with the second power connecting end;
the RC charging circuit is connected between the second voltage connecting end and the voltage division connecting end;
and the voltage following circuit is provided with a following input end and a following output end, the following input end is used for inputting the voltage signal generated by the RC charging circuit, and the following output end is connected with the signal input end.
According to some embodiments of the invention, the first voltage divider circuit comprises:
one end of the first voltage dividing resistor is used for connecting the second working voltage, and the other end of the first voltage dividing resistor is connected with the second power connecting end;
and a second voltage dividing resistor connected between the first power connection terminal and the second power connection terminal.
According to some embodiments of the invention, the RC charging circuit comprises:
one end of the charging resistor unit is connected with the second power connecting end, and the other end of the charging resistor unit is connected with the following input end;
and the charging capacitor is connected between the following input end and the reference ground.
According to some embodiments of the present invention, the voltage follower circuit comprises:
a positive input end of the first operational amplifier unit is connected with the other end of the charging resistor unit, and a negative input end and an output end of the first operational amplifier unit are both connected with the signal input end;
and one end of the filter capacitor is connected with the negative input end of the first operational amplifier unit, and the other end of the filter capacitor is connected with the charging resistor unit.
According to some embodiments of the invention, the signal output circuit further comprises:
one end of the third voltage dividing resistor is used for connecting the second working voltage, and the other end of the third voltage dividing resistor is connected with the first controlled end;
a fourth voltage dividing resistor connected between the first controlled terminal and the reference ground.
According to some embodiments of the invention, the feedback regulation module comprises:
the feedback regulating circuit is provided with a feedback input end and a feedback output end, and the feedback input end is connected with the rectifying and filtering output end;
and the output enhancement circuit is provided with an enhancement input end and an enhancement output end, the enhancement input end is connected with the feedback output end, and the enhancement output end is used for connecting a load.
According to some embodiments of the invention, the feedback regulation module comprises:
the second operational amplifier unit is connected with a first feedback resistor between the positive input end of the second operational amplifier unit and the rectifying and filtering output end, a second feedback resistor between the negative input end and the reference ground, a third feedback resistor between the output end and the negative input end, a fourth feedback resistor, a fifth feedback resistor and a sixth feedback resistor sequentially connected between the output end and the positive input end, and an output enhancement circuit is connected with a common connection point of the fourth feedback resistor and the fifth feedback resistor.
According to some embodiments of the invention, the output enhancement circuit comprises:
the second switching power unit is provided with a second controlled end, a third power connecting end and a fourth power connecting end, the second controlled end and the fourth power connecting end are connected with a common connection point of the fourth feedback resistor and the fifth feedback resistor, and the third power connecting end is used for connecting the second working voltage.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic circuit diagram of a signal output circuit according to an embodiment of the present invention.
Reference numerals:
a signal isolation module 100,
A rectifying and filtering module 200, a first voltage dividing circuit 210, an RC charging circuit 220, a voltage follower circuit 230,
A feedback adjusting module 300, a feedback adjusting circuit 310, and an output enhancing circuit 320.
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, if there are first, second, etc. described, it is only for the purpose of distinguishing technical features, and it is not understood that relative importance is indicated or implied or that the number of indicated technical features is implicitly indicated or that the precedence of the indicated technical features is implicitly indicated.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper and lower directions, is the orientation or positional relationship shown on the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that unless there is an explicit limitation, the words such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above words in the present invention by combining the specific contents of the technical solutions.
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the embodiments described below are some, not all embodiments of the present invention.
For better illustration, the application scenario of the signal output circuit is briefly described here. The transmitter comprises a control module, a signal output circuit and a detection circuit, wherein after the detection circuit is used for detecting a target signal (such as water pressure, air pressure and the like), the control module receives and identifies the detected target signal, and then the control signal output circuit transmits the detected target signal to the outside in a current signal mode.
It should be noted that, the above-mentioned application scenarios are only for better explanation of the embodiments of the present invention, and should not be taken as limitations to the scope of the present invention.
Referring to fig. 1, fig. 1 is a system diagram of a signal output circuit according to an embodiment of the present invention, the signal output circuit includes a signal isolation module 100, a rectifying and filtering module 200, and a feedback regulation module 300,
a signal isolation module 100 having an isolation input terminal and an isolation output terminal, wherein the isolation input terminal is used for inputting a PWM signal;
the rectification filter module 200 is provided with a rectification filter input end and a rectification filter output end, the rectification filter input end is connected with the isolation output end, and the rectification filter module 200 is used for rectifying and filtering signals output by the isolation output end;
the feedback adjusting module 300 has a signal input terminal, a feedback input terminal and a feedback output terminal, the signal input terminal is connected with the rectifying and filtering output terminal, the feedback input terminal is connected with the feedback output terminal, and the feedback output terminal is used for connecting a load.
In this embodiment, the PWM signal output by the control module is isolated by the signal isolation module 100 and then output to the rectification filter module 200, so that the control module can be isolated from the outside. After the PWM signal is input to the isolation input end of the signal isolation module 100, a signal corresponding to the PWM signal is output to the isolation output end, and the signal is further transmitted to the rectification filter module 200 to complete rectification and filtering, so as to obtain a required dc signal, and finally, feedback adjustment is performed through the feedback adjustment module 300, so as to stabilize the dc signal output by the rectification filter module 200. It should be noted that the PWM signal output by the control module can change the magnitude of the output specific dc signal by changing the duty ratio.
The utility model discloses signal output circuit service signal keeps apart module 100 can realize the signal isolation between control module and the output circuit to avoid when signal output circuit suffers the thunderbolt surge, can cause the harm to control module, make other functions of control module can normal use. Meanwhile, the receiving control module sends the PWM signal, and the rectifying and filtering module 200 and the feedback adjusting module 300 are used for carrying out signal adjustment on the received PWM signal, so that a required 4-20mA current signal can be obtained, and the influence caused by external load change can be effectively reduced.
In some embodiments, the signal isolation module 100 includes an optical coupling isolation module U1, the optical coupling isolation module U1 having a first input terminal for connecting to the first operating voltage D3V3, a second input terminal for inputting the PWM signal, a first output terminal for connecting to the reference ground 24VG', and a second output terminal connected to the rectifying and filtering input terminal. There is physical isolation between opto-coupler isolation module U1's the output side and the input side to can effectual realization to the isolation of control module and signal output side, guarantee when receiving the condition such as thunderbolt surge, control module can not receive the harm, make control module can continue to accomplish the use of other functions.
Referring to fig. 1, in some embodiments, the rectifying and filtering module 200 includes: a first switching power cell, a first voltage divider circuit 210, an RC charging circuit 220, and a voltage follower circuit 230.
The first switch power unit is provided with a first controlled end, a first power connecting end and a second power connecting end, the first controlled end is connected with the isolation output end, and the first power connecting end is used for being connected with a reference ground 24VG';
a first voltage divider 210 having a first voltage connection terminal for connecting the second operating voltage +24V, a second voltage connection terminal for connecting the reference ground 24VG', and a voltage divider connection terminal connected to the second power connection terminal;
an RC charging circuit 220 connected between the second voltage connection terminal and the voltage dividing connection terminal;
the voltage follower circuit 230 has a follower input terminal for inputting the voltage signal generated by the RC charging circuit 220, and a follower output terminal connected to the signal input terminal.
The optical coupling isolation module U1 can control the first switching power unit to be turned on or off, so that the voltage of the voltage division connection end of the voltage division circuit can be changed, the voltage entering the RC charging circuit 220 changes, and finally the conversion from the PWM signal to the dc signal is completed after the voltage following circuit 230. Specifically, changing the duty ratio of the PWM signal changes the time when the voltage dividing connection terminal is at the high voltage, so as to change the charging time of the RC charging circuit 220, and the dc signal finally output by the voltage follower circuit 230 changes along with the change of the duty ratio of the PWM signal. As shown in fig. 1, the first switching power unit may directly employ a MOS transistor.
In some embodiments, the first voltage divider circuit 210 includes: a first voltage dividing resistor R4 and a second voltage dividing resistor R5. One end of the first voltage dividing resistor R4 is used for connecting a second working voltage +24V, and the other end of the first voltage dividing resistor R4 is connected with a second power connecting end; and the second voltage-dividing resistor R5 is connected between the first power connecting end and the second power connecting end. Referring to fig. 1, after the first switching power unit is turned on, the second voltage dividing resistor R5 is shorted, thereby changing the voltage entering the RC charging circuit 220.
Referring to fig. 1, in some embodiments, voltage follower circuit 230 includes: the first operational amplifier unit U2-B and the filter capacitor C1. The positive input end of the first operational amplifier unit U2-B is connected with the other end of the charging resistor unit, and the negative input end and the output end of the first operational amplifier unit U2-B are both connected with the signal input end; and one end of the filter capacitor C1 is connected with the negative input end of the first operational amplifier unit U2-B, and the other end of the filter capacitor C1 is connected with the charging resistor unit. The first operational amplifier unit U2-B can be used for realizing voltage following, the filter capacitor C1 can be used for realizing filtering, and finally the voltage following circuit 230 can output direct current signals.
Referring to fig. 1, in some embodiments, the charging resistor unit includes a first charging resistor R6 and a second charging resistor R7, and the filter capacitor C1 has one end connected to a common point of the first charging resistor R6 and the second charging resistor R7 and the other end connected to a negative input terminal of the first operational amplifier unit U2-B.
Referring to fig. 1, in some embodiments, the signal output circuit further comprises: third voltage dividing resistor R2 and fourth voltage dividing resistor R3. One end of the third voltage dividing resistor R2 is used for connecting the second working voltage +24V, and the other end of the third voltage dividing resistor R2 is connected with the first controlled end; and a fourth voltage dividing resistor R3 connected between the first controlled terminal and the ground 24 VG'. The third voltage dividing resistor R2 and the fourth voltage dividing resistor R3 form a second voltage dividing circuit, and the second voltage dividing circuit can assist the optical coupling isolation module U1 to complete adjustment of the PWM signal.
Referring to fig. 1, in some embodiments, the feedback adjustment module 300 includes: feedback regulation circuit 310, output boost circuit 320. A feedback regulating circuit 310 having a feedback input terminal and a feedback output terminal, the feedback input terminal being connected to the rectifying filter output terminal; and an output boost circuit 320 having a boost input connected to the feedback output and a boost output for connecting to a load. The feedback adjusting circuit 310 can further adjust the converted direct current signal into a required 4-20mA current signal, and the current output is more stable and does not change with the external load. The output enhancement circuit 320 is added to improve the output capability and further ensure the stability of the output current signal.
Referring to fig. 1, in some embodiments, the feedback adjusting module 300 includes a second operational amplifier unit U2-a, a first feedback resistor R9 is connected between a positive input end and a rectifying and filtering output end of the second operational amplifier unit U2-a, a second feedback resistor R8 is connected between a negative input end and a ground reference 24VG', a third feedback resistor R11 is connected between the output end and the negative input end, a fourth feedback resistor R12, a fifth feedback resistor R13, and a sixth feedback resistor R10 are sequentially connected between the output end and the positive input end, and the output enhancement circuit 320 is connected to a common connection point of the fourth feedback resistor R12 and the fifth feedback resistor R13. The second operational amplifier unit U2-A can be used for forming a feedback circuit, so that input can be adjusted according to output conversion, and stability of an output current signal is guaranteed.
Referring to fig. 1, in some embodiments, the output boost circuit 320 includes a second switching power unit having a second controlled terminal, a third power connection terminal, and a fourth power connection terminal, the second controlled terminal and the fourth power connection terminal are both connected to a common connection point of a fourth feedback resistor R12 and a fifth feedback resistor R13, and the third power connection terminal is used for connecting a second operating voltage +24V. The second switching power unit introduces a power supply, so that the output capability is further enhanced, and the current output stability of the whole signal output circuit is ensured. As shown in fig. 1, the second switching power unit may employ a transistor, and an external power source is introduced by using the transistor to isolate the power source and improve signal strength.
For better explanation of the signal output circuit according to the embodiment of the present invention, the whole operation process is further described herein by way of specific embodiments.
Here, a signal output circuit according to this embodiment mode will be described with reference to fig. 1.
The input side of the optical coupling isolation module U1 is used for accessing a PWM signal, and the output side outputs the isolated PWM signal;
a second voltage division circuit consisting of a third voltage division resistor R2 and a fourth voltage division resistor R3, wherein the common connection point of the second voltage division circuit is connected with the output side of the optical coupling isolation module U1; the common connection point of the second voltage division circuit is also connected with the grid electrode of the MOS tube;
the first voltage dividing resistor R4 and the second voltage dividing resistor R5 form a first voltage dividing circuit 210, and a common connection point of the first voltage dividing circuit 210 is connected with a drain electrode of the MOS tube; the source electrode of the MOS tube is connected with a reference ground 24VG';
a first charging resistor R6 and a second charging resistor R7 are sequentially connected between the common connection point of the first voltage division circuit 210 and the positive input end of the first operational amplifier unit U2-B;
a charging capacitor C2 is connected between the positive input end of the first operational amplifier unit U2-B and a reference ground 24VG'; the negative input end of the first operational amplifier unit U2-B is connected with the output end of the first operational amplifier unit U2-B, and a filter capacitor C1 is connected between the negative input end of the first operational amplifier unit U2-B and a common connection point of a first charging resistor R6 and a second charging resistor R7;
a first feedback resistor R9 is connected between the output end of the first operational amplifier unit U2-B and the positive input end of the second operational amplifier unit U2-A; a fourth feedback resistor R12, a fifth feedback resistor R13 and a sixth feedback resistor R10 are sequentially connected between the output end and the positive input end of the first operational amplifier unit U2-B, a second feedback resistor R8 is connected between the negative input end of the first operational amplifier unit U2-B and a reference ground 24VG', and a third feedback resistor R11 is connected between the output end and the negative input end of the first operational amplifier unit U2-B;
the base electrode and the emitter electrode of the triode are both connected with the common connection point of the fourth feedback resistor R12 and the fifth feedback resistor R13, and the collector electrode of the triode is connected with the second working voltage +24V.
The above is a specific circuit configuration of the present embodiment, and the resistor RL shown in fig. 1 is an equivalent resistance of a load.
The following briefly describes the operation of the signal output circuit according to this embodiment.
The control module outputs a PWM signal to the optical coupling isolation module U1;
the optical coupling isolation module U1 outputs an isolated PWM signal, the PWM signal is transmitted to a grid electrode of the MOS tube after passing through the second voltage division circuit, if the high level is transmitted to the grid electrode, the MOS tube is conducted, and if the low level is transmitted to the grid electrode, the MOS tube is cut off, so that on-off control of the MOS tube is completed under the control of the PWM signal;
when the MOS transistor is turned on, two ends of the second voltage-dividing resistor R5 are in short circuit, when the MOS transistor is turned off, the first voltage-dividing circuit 210 completes normal voltage division, and by switching the two states, the charging time of the RC charging circuit 220 can be adjusted, so that the RC charging circuit 220 completes different charging effects, and the direct-current signal finally output by the first operational amplifier unit U2-B is caused to change correspondingly along with the PWM signal;
the direct current signal output by the first operational amplifier unit U2-B is further transmitted to the feedback regulation module 300 constructed by the second operational amplifier unit U2-a, so that further feedback regulation can be completed based on the feedback regulation circuit 310, and meanwhile, the triode can also realize the enhancement of the output current signal.
The utility model discloses signal output circuit can effectual improvement realize the isolation to control module, avoids situations such as thunderbolt surge to control module's harm. And simultaneously, the utility model discloses signal output circuit can accomplish 4mA to 20mA signal output's adjustment based on the PWM signal, and the PWM signal can guarantee the stability of output after rectification, filtering, feedback control and signal enhancement, does not receive external load's change, is fit for carrying out the industrialization and promotes.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (10)
1. A signal output circuit, comprising:
the signal isolation module is provided with an isolation input end and an isolation output end, and the isolation input end is used for inputting a PWM signal;
the rectification filtering module is provided with a rectification filtering input end and a rectification filtering output end, the rectification filtering input end is connected with the isolation output end, and the rectification filtering module is used for rectifying and filtering signals output by the isolation output end;
the feedback adjusting module is provided with a signal input end, a feedback input end and a feedback output end, the signal input end is connected with the rectifying and filtering output end, the feedback input end is connected with the feedback output end, and the feedback output end is used for being connected with a load.
2. The signal output circuit of claim 1, wherein the signal isolation module comprises:
and the optical coupling isolation module is provided with a first input end used for connecting a first working voltage, a second input end used for inputting the PWM signal, a first output end used for connecting a reference ground and a second output end connected with the rectifying and filtering input end.
3. The signal output circuit according to claim 1 or 2, wherein the rectifying and filtering module comprises:
the first switching power unit is provided with a first controlled end, a first power connecting end and a second power connecting end, the first controlled end is connected with the isolation output end, and the first power connecting end is used for being connected with a reference ground;
the first voltage division circuit is provided with a first voltage connecting end used for connecting a second working voltage, a second voltage connecting end used for connecting a reference ground and a voltage division connecting end connected with the second power connecting end;
the RC charging circuit is connected between the second voltage connecting end and the voltage dividing connecting end;
and the voltage following circuit is provided with a following input end and a following output end, the following input end is used for inputting the voltage signal generated by the RC charging circuit, and the following output end is connected with the signal input end.
4. The signal output circuit according to claim 3, wherein the first voltage dividing circuit comprises:
one end of the first voltage dividing resistor is used for connecting the second working voltage, and the other end of the first voltage dividing resistor is connected with the second power connecting end;
and a second voltage dividing resistor connected between the first power connection terminal and the second power connection terminal.
5. The signal output circuit of claim 3, wherein the RC charging circuit comprises:
one end of the charging resistor unit is connected with the second power connecting end, and the other end of the charging resistor unit is connected with the following input end;
and the charging capacitor is connected between the following input end and the reference ground.
6. The signal output circuit of claim 5, wherein the voltage follower circuit comprises:
a positive input end of the first operational amplifier unit is connected with the other end of the charging resistor unit, and a negative input end and an output end of the first operational amplifier unit are both connected with the signal input end;
and one end of the filter capacitor is connected with the negative input end of the first operational amplifier unit, and the other end of the filter capacitor is connected with the charging resistor unit.
7. The signal output circuit according to claim 3, characterized in that the signal output circuit further comprises:
a third voltage dividing resistor, one end of which is used for connecting the second working voltage, and the other end of which is connected with the first controlled end;
a fourth voltage dividing resistor connected between the first controlled terminal and the reference ground.
8. The signal output circuit of claim 7, wherein the feedback adjustment module comprises:
the feedback regulating circuit is provided with a feedback input end and a feedback output end, and the feedback input end is connected with the rectifying and filtering output end;
and the output enhancement circuit is provided with an enhancement input end and an enhancement output end, the enhancement input end is connected with the feedback output end, and the enhancement output end is used for connecting a load.
9. The signal output circuit of claim 8, wherein the feedback adjustment module comprises:
the second operational amplifier unit is connected with a first feedback resistor between the positive input end of the second operational amplifier unit and the rectifying and filtering output end, a second feedback resistor between the negative input end and the reference ground, a third feedback resistor between the output end and the negative input end, a fourth feedback resistor, a fifth feedback resistor and a sixth feedback resistor are sequentially connected between the output end and the positive input end, and the output enhancement circuit is connected with a common connection point of the fourth feedback resistor and the fifth feedback resistor.
10. The signal output circuit of claim 9, wherein the output boost circuit comprises:
the second switching power unit is provided with a second controlled end, a third power connecting end and a fourth power connecting end, the second controlled end and the fourth power connecting end are connected with a common connection point of the fourth feedback resistor and the fifth feedback resistor, and the third power connecting end is used for connecting the second working voltage.
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|---|---|---|---|
| CN202222468912.4U CN218733224U (en) | 2022-09-16 | 2022-09-16 | Signal output circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222468912.4U CN218733224U (en) | 2022-09-16 | 2022-09-16 | Signal output circuit |
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| CN218733224U true CN218733224U (en) | 2023-03-24 |
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| CN202222468912.4U Active CN218733224U (en) | 2022-09-16 | 2022-09-16 | Signal output circuit |
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