CN211945783U - Multi-device communication system - Google Patents
Multi-device communication system Download PDFInfo
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- CN211945783U CN211945783U CN202020081109.3U CN202020081109U CN211945783U CN 211945783 U CN211945783 U CN 211945783U CN 202020081109 U CN202020081109 U CN 202020081109U CN 211945783 U CN211945783 U CN 211945783U
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Abstract
The application discloses many equipment communication system, including controlling means, first external device and second external device, wherein: the control device is connected with the first external device through a signal switching unit to form a first loop; the control device is connected with the second external device through a signal switching unit to form a second loop; the second loop further comprises a low-voltage-drop diode and a differential amplification circuit, the low-voltage-drop diode is connected in series between the control device and the second external device, and the differential amplification circuit is connected in parallel at two ends of the low-voltage-drop diode and connected with the signal switching unit. According to the multi-equipment communication system, the low-voltage-drop diode is arranged, the characteristic that the change of the conduction voltage along with the conduction current is small is utilized, the switching signal is generated and amplified through the differential amplification circuit, the signal switching unit in the circuit is controlled, the switching among different load equipment is realized, the efficiency is high, and the switching is stable and reliable.
Description
Technical Field
The present application relates to the field of communication control technologies, and in particular, to a multi-device communication system.
Background
In the field of elevator control, because factors such as CPU (Central processing Unit) resources and sizes of products are considered, most control system products are externally provided with only one communication interface for checking internal data and debugging of an elevator control system.
However, with the popularization of intellectualization and the diversity of product functions, the originally reserved single communication interface cannot meet the current requirements, and in practical application, the situation that multiple devices are used simultaneously is often encountered, for example, the switching between an elevator debugger and a rear-mounted elevator internet of things is realized, the devices are manually dismounted and mounted at present, the efficiency in the process is low, and the risk of product damage is increased.
Considering the compatibility problem that many old products are connected with new equipment, the demand for automatic switching devices of communication interfaces is increasing day by day, but at present, the frequency of communication signals is high and is easy to be interfered, external equipment belongs to a small-voltage system below 5V, the load characteristics and the identification degrees of different equipment are different, and stable and reliable switching among multiple equipment is difficult to achieve.
SUMMERY OF THE UTILITY MODEL
The utility model provides a many equipment communication system, through setting up low-voltage drop diode, utilize its turn-on voltage to change along with the turn-on current characteristic that is little, produce switching signal to through differential amplifier circuit amplification, with the signal switching unit among the control circuit, realize the switching between the different load equipment, efficiency is higher, and switch reliable and stable.
The application provides a multi-equipment communication system, is applied to the control system of elevator, including controlling means, first external device and second external device, wherein:
the control device is connected with the first external device through a signal switching unit to form a first loop;
the control device is connected with the second external device through a signal switching unit to form a second loop;
the second loop further comprises a low-voltage-drop diode and a differential amplification circuit, the low-voltage-drop diode is connected between the control device and a second external device in series, and the differential amplification circuit is connected to two ends of the low-voltage-drop diode in parallel and connected with the signal switching unit;
when the second external device is started, the low-voltage-drop diode generates a switching signal, and the switching signal is amplified by the differential amplification circuit and drives the signal switching unit to switch the signal switching unit from conducting the first loop to conducting the second loop.
Several alternatives are provided below, but not as an additional limitation to the above general solution, but merely as a further addition or preference, each alternative being combinable individually for the above general solution or among several alternatives without technical or logical contradictions.
Optionally, the differential amplifier circuit includes a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first resistor, a second resistor, a third resistor, and an operational amplifier, the first capacitor is connected in parallel to two ends of the low-dropout diode, the first capacitor, the first resistor, the second capacitor, and the second resistor are connected in series to form a loop, a connection point of the first resistor and the second capacitor is connected to the positive input terminal of the operational amplifier, a connection point of the second resistor and the second capacitor is connected to the negative input terminal of the operational amplifier, an output terminal of the operational amplifier is connected to the third capacitor, and meanwhile, another end of the third capacitor is connected to the negative input terminal of the operational amplifier, an output terminal of the operational amplifier is further connected to the third resistor, another end of the third resistor is connected to the negative input terminal of the operational amplifier, two ends of the third resistor are connected in parallel to the fourth capacitor, and the output end of the operational amplifier is connected with the signal switching unit.
Optionally, the second loop further includes a hysteresis circuit, and the hysteresis circuit is disposed between the differential amplifying circuit and the signal switching unit, and is configured to stabilize the switching signal and generate the switching signal.
Optionally, the hysteresis circuit includes a fourth resistor, a fifth resistor, and a voltage comparator, one end of the fourth resistor is connected to the differential amplifier circuit, the other end of the fourth resistor is connected to the positive input terminal of the voltage comparator, the output terminal of the voltage comparator is connected to the fifth resistor, the other end of the fifth resistor is connected to the negative input terminal of the voltage comparator, and the output terminal of the voltage comparator is connected to the signal switching unit.
Optionally, the hysteresis circuit further includes a fifth capacitor, an output end of the voltage comparator is connected to the fifth capacitor, and the other end of the fifth capacitor is grounded.
Optionally, the second loop further includes a driving circuit, and the driving circuit is disposed between the hysteresis circuit and the signal switching unit, and is configured to enhance a driving capability of the switching signal.
Optionally, the second loop further includes a switching signal output circuit, and the switching signal output circuit is connected to the hysteresis circuit and configured to receive and output a successful switching signal of the switching device.
Optionally, the first loop further includes a first power supply, and the first power supply is disposed between the control device and a first external device.
Optionally, the second loop further comprises a second power supply, and the second power supply is disposed between the control device and a second external device.
Optionally, the signal switching unit includes a signal relay.
According to the multi-equipment communication system, the low-voltage-drop diode is arranged, the characteristic that the change of the conduction voltage along with the conduction current is small is utilized, the switching signal is generated and amplified through the differential amplification circuit, the signal switching unit in the circuit is controlled, the switching among different load equipment is realized, the efficiency is high, and the switching is stable and reliable.
Drawings
Fig. 1 is a schematic diagram of a multi-device communication system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a multi-device communication system according to another embodiment of the present invention;
fig. 3 is a circuit diagram of a differential amplifier circuit of a multi-device communication system according to an embodiment of the present invention;
fig. 4 is a circuit diagram of a hysteresis circuit of a multi-device communication system according to an embodiment of the present invention;
fig. 5 is a waveform variation diagram of a switching signal of a multi-device communication system processed by a hysteresis circuit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, fig. 1 provides a multi-device communication system.
An embodiment of the present application provides a multi-device communication system, is applied to the control system of elevator, including controlling means, first external device and second external device, wherein:
the control device is connected with a first external device through a signal switching unit to form a first loop;
the control device is connected with a second external device through a signal switching unit to form a second loop;
the second loop further comprises a low-voltage-drop diode D1 and a differential amplification circuit, wherein the low-voltage-drop diode D1 is connected between the control device and the second external device in series, and the differential amplification circuit is connected to two ends of the low-voltage-drop diode D1 in parallel and connected with the signal switching unit;
when the second external device is started, the low dropout diode D1 generates a switching signal, and after the switching signal is amplified by the differential amplifier circuit, the switching signal unit is driven to switch from conducting the first loop to conducting the second loop.
It can be understood that one of the characteristics of the diode is that when the current of the diode reaches an upper limit, the change amplitude of the tube voltage drop of the diode along with the current flowing through the diode is small, and according to the characteristic, a differential amplifying circuit is added at two ends of the diode to amplify a small signal, so that an effective switching signal is generated. The tube voltage drop of the low-breakover voltage diode is generally within 0.3V, and the normal voltage signal is not influenced, so that the normal operation of an external device is not influenced.
It is understood that one end of the control device is connected to the first external device and the second external device through the signal switching unit, and the other end is directly connected to the first external device and is connected to the second external device through the low dropout diode D1.
In this embodiment, the multi-device communication system includes only two external apparatuses, in other embodiments, a plurality of external apparatuses may be included, and the first and second should not be construed as limiting the number of external apparatuses. It is to be understood that when the multi-device communication system includes a plurality of external apparatuses, the first external apparatus and the second external apparatus are only schematic descriptions of two of the external apparatuses. Specifically, the number of switching positions of the signal switching unit is adapted to the number of external devices.
According to the multi-device communication system, the low-voltage-drop diode D1 is arranged, the characteristic that the change of the conduction voltage along with the conduction current is small is utilized, the switching signal is generated and amplified through the differential amplification circuit, the signal switching unit in the circuit is controlled, the switching among different load devices is achieved, the efficiency is high, and the switching is stable and reliable.
Referring to fig. 2, fig. 2 is a schematic diagram of a multi-device communication system according to another embodiment of the present invention. In this embodiment, the multi-device communication system includes a control device, a first external device, a second external device, and a third external device, and it can be understood that the control device, the first external device, and the third external device are connected through a signal switching unit, a driving circuit, a hysteresis circuit, a switching signal output circuit, a differential amplifying circuit, and a diode, and the connection manner is the same as that of the embodiment shown in fig. 1. It can be understood that, when the multi-device communication system includes 4 or more external apparatuses, the connection may be performed according to the connection method of the embodiment.
Referring to fig. 3, fig. 3 is a circuit diagram of a differential amplifier circuit of a multi-device communication system according to an embodiment of the present invention. Specifically, the differential amplifier circuit includes a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first resistor R1, a second resistor R2, a third resistor R3, and an operational amplifier a1, where the first capacitor C1 is connected in parallel to two ends of the low dropout diode D1, the first capacitor C1, the first resistor R1, the second capacitor C1, and the second resistor R1 are connected in series to form a loop, a connection point of the first resistor R1 and the second capacitor C1 is connected to a positive input terminal of the operational amplifier a1, a connection point of the second resistor R1 and the second capacitor C1 is connected to a negative input terminal of the operational amplifier a1, an output terminal of the operational amplifier a1 is connected to the third capacitor C1, while the other end of the third capacitor C1 is connected to the negative input terminal of the operational amplifier a1, an output terminal of the operational amplifier a1 is connected to the third resistor R1, and two ends of the third capacitor R1 are connected to the fourth input terminal of the operational amplifier a1, the output terminal of the operational amplifier a1 is connected to the signal switching unit. In this embodiment, a sixth capacitor C6 and a sixth resistor R6 are further connected in parallel between the connection point of the first resistor R1 and the second capacitor C2 and the positive input end of the operational amplifier a1, the sixth capacitor C6 and the sixth resistor R6 are connected in series, and the connection point of the sixth capacitor C6 and the sixth resistor R6 is grounded for decoupling.
In another embodiment, the second loop further includes a hysteresis circuit, which is disposed between the differential amplifying circuit and the signal switching unit, and is used for stabilizing the switching signal and generating the switching signal.
Referring to fig. 4, fig. 4 is a circuit diagram of a hysteresis circuit of a multi-device communication system according to an embodiment of the present invention. Specifically, the hysteresis circuit includes a fourth resistor R4, a fifth resistor R5 and a voltage comparator a2, one end of the fourth resistor R4 is connected to the differential amplifier circuit, the other end of the fourth resistor R4 is connected to the positive input terminal of the voltage comparator a2, the output terminal of the voltage comparator a2 is connected to the fifth resistor R5, the other end of the fifth resistor R5 is connected to the negative input terminal of the voltage comparator a2, and the output terminal of the voltage comparator a2 is connected to the signal switching unit. In this embodiment, the hysteresis circuit further includes a fifth capacitor C5, the output terminal of the voltage comparator a2 is connected to the fifth capacitor C5, and the other terminal of the fifth capacitor C5 is grounded for decoupling.
Referring to fig. 5, fig. 5 is a waveform variation diagram of a switching signal of a multi-device communication system according to an embodiment of the present invention after being processed by a hysteresis circuit, where an upper portion of fig. 5 is an original waveform of the switching signal, and a lower portion of fig. 5 is a waveform of the switching signal after being processed by the hysteresis circuit. It can be understood that the hysteresis circuit stabilizes the switching signal, so that the switching signal is not frequently switched around the threshold voltage, and a certain current stabilizing effect is achieved. Meanwhile, the stabilized switching signal is also output as a switching signal for prompting the switching equipment to succeed.
In another embodiment, the second loop further includes a driving circuit disposed between the hysteresis circuit and the signal switching unit for enhancing the driving capability of the switching signal.
A driving Circuit (Drive Circuit), an intermediate Circuit (i.e., a Circuit for amplifying a signal of the control Circuit so that the signal can Drive the power transistor) between the main Circuit and the control Circuit, is called a driving Circuit. The basic task of the driving circuit is to convert the signal transmitted from the information electronic circuit into a signal which is added between the control end and the common end of the power electronic device and can be switched on or off according to the requirement of the control target of the information electronic circuit. The semi-control device only needs to provide an on control signal, and the full-control device only needs to provide the on control signal and the off control signal so as to ensure that the device is reliably turned on or off as required.
In another embodiment, the second loop further includes a switching signal output circuit, and the switching signal output circuit is connected to the hysteresis circuit and configured to receive and output a successful switching signal of the switching device. It can be understood that the switching signal output circuit can be any communication circuit, and the effect of transmitting the switching signal for prompting the switching equipment to be successful to the upper computer is only needed to be achieved.
In another embodiment, the first loop further comprises a first power source disposed between the control device and the first external device. Specifically, the first power supply is provided at one end of the control device directly connected to the first external device.
In another embodiment, the second circuit further comprises a second power source disposed between the control device and a second external device. Specifically, the second power supply is provided at the end where the low dropout diode D1 is located.
In another embodiment, the signal switching unit includes a signal relay. It can be understood that the signal switching unit can be other electronic devices, and only the effect of receiving the switch signal and switching the loop is achieved.
According to the multi-equipment communication system, the low-voltage-drop diode is arranged, the characteristic that the change of the conduction voltage along with the conduction current is small is utilized, the switching signal is generated and amplified through the differential amplification circuit, the signal switching unit in the circuit is controlled, the switching among different load equipment is realized, the efficiency is high, and the switching is stable and reliable.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features. When technical features in different embodiments are represented in the same drawing, it can be seen that the drawing also discloses a combination of the embodiments concerned.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application.
Claims (10)
1. Multi-device communication system, comprising a control device, a first external device and a second external device, wherein:
the control device is connected with the first external device through a signal switching unit to form a first loop;
the control device is connected with the second external device through a signal switching unit to form a second loop;
the second loop further comprises a low-voltage-drop diode and a differential amplification circuit, the low-voltage-drop diode is connected between the control device and a second external device in series, and the differential amplification circuit is connected to two ends of the low-voltage-drop diode in parallel and connected with the signal switching unit;
when the second external device is started, the low-voltage-drop diode generates a switching signal, and the switching signal is amplified by the differential amplification circuit and drives the signal switching unit to switch the signal switching unit from conducting the first loop to conducting the second loop.
2. The multi-device communication system according to claim 1, wherein the differential amplifier circuit comprises a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first resistor, a second resistor, a third resistor, and an operational amplifier, the first capacitor is connected in parallel to two ends of the low dropout diode, the first capacitor, the first resistor, the second capacitor, and the second resistor are connected in series to form a loop, a connection point of the first resistor and the second capacitor is connected to the positive input terminal of the operational amplifier, a connection point of the second resistor and the second capacitor is connected to the negative input terminal of the operational amplifier, the output terminal of the operational amplifier is connected to the third capacitor, and the other end of the third capacitor is connected to the negative input terminal of the operational amplifier, the output terminal of the operational amplifier is further connected to the third resistor, and the other end of the third resistor is connected to the negative input terminal of the operational amplifier, the fourth capacitor is connected in parallel to two ends of the third resistor, and the output end of the operational amplifier is connected with the signal switching unit.
3. The multi-device communication system according to claim 1, wherein the second loop further comprises a hysteresis circuit, the hysteresis circuit being disposed between the differential amplifying circuit and the signal switching unit, for stabilizing the switching signal and generating the switching signal.
4. The multi-device communication system according to claim 3, wherein the hysteresis circuit comprises a fourth resistor, a fifth resistor and a voltage comparator, one end of the fourth resistor is connected to the differential amplifier circuit, the other end of the fourth resistor is connected to the positive input terminal of the voltage comparator, the output terminal of the voltage comparator is connected to the fifth resistor, the other end of the fifth resistor is connected to the negative input terminal of the voltage comparator, and the output terminal of the voltage comparator is connected to the signal switching unit.
5. The multi-device communication system according to claim 4, wherein the hysteresis circuit further comprises a fifth capacitor, the output terminal of the voltage comparator is connected to the fifth capacitor, and the other terminal of the fifth capacitor is grounded.
6. The multi-device communication system according to claim 3, wherein the second loop further comprises a driving circuit disposed between the hysteresis circuit and the signal switching unit for enhancing the driving capability of the switching signal.
7. The multiple device communication system according to claim 3, wherein the second loop further comprises a switching signal output circuit, and the switching signal output circuit is connected to the hysteresis circuit and configured to receive and output a switching signal indicating success of the switching device.
8. The multi-device communication system according to claim 1, wherein the first loop further comprises a first power source disposed between the control apparatus and a first external apparatus.
9. The multiple equipment communication system according to claim 1, wherein the second loop further comprises a second power supply, the second power supply being disposed between the control device and a second external device.
10. The multi-device communication system according to claim 1, wherein the signal switching unit comprises a signal relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020081109.3U CN211945783U (en) | 2020-01-14 | 2020-01-14 | Multi-device communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020081109.3U CN211945783U (en) | 2020-01-14 | 2020-01-14 | Multi-device communication system |
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| CN211945783U true CN211945783U (en) | 2020-11-17 |
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| CN202020081109.3U Active CN211945783U (en) | 2020-01-14 | 2020-01-14 | Multi-device communication system |
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