CN217956673U - Overcurrent protection circuit and communication system - Google Patents
Overcurrent protection circuit and communication system Download PDFInfo
- Publication number
- CN217956673U CN217956673U CN202221786592.0U CN202221786592U CN217956673U CN 217956673 U CN217956673 U CN 217956673U CN 202221786592 U CN202221786592 U CN 202221786592U CN 217956673 U CN217956673 U CN 217956673U
- Authority
- CN
- China
- Prior art keywords
- overcurrent protection
- pole
- coil
- protection circuit
- communication
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Protection Of Static Devices (AREA)
Abstract
The utility model discloses an overcurrent protection circuit and communication system. Wherein, this communication system includes two at least communication nodes, and every communication node includes power supply terminal, common mode inductance and ground terminal, and the power supply terminal connects gradually common mode inductance's first coil, communication bus's first line, load, communication bus's second line, common mode inductance's second coil, ground terminal, and overcurrent protection circuit one-to-one sets up in every communication node, wherein includes: and the first end of the overcurrent protection module is connected with the second coil of the common-mode inductor, the second end of the overcurrent protection module is connected with the grounding terminal, and the third end of the overcurrent protection module is connected between the power supply terminal and the first coil of the common-mode inductor and is used for controlling the communication node to be powered off when the current of the load is overlarge. Through the utility model discloses, can realize realizing overcurrent protection through hardware control's mode, response speed is higher, and overcurrent protection that carries on that can be more timely has improved whole communication system's reliability.
Description
Technical Field
The utility model relates to an electron electric power technical field particularly, relates to an overcurrent protection circuit and communication system.
Background
With the rapid development of science and technology, people have higher and higher requirements on the reliability of a communication system, and the multi-node network power supply carrier communication technology has the advantage of convenient wiring. In the communication system applying the technology, a power supply and communication share one bus, electric signals and communication signals exist on the same communication bus at the same time, a plurality of communication nodes and one load are connected on the same communication bus in parallel, and only one communication node supplies power to the load, so that an excellent power supply control scheme is required to ensure the reliability of a power supply system. If the current of a communication loop is too large, the load is damaged, and in order to avoid an overcurrent phenomenon, the current overcurrent protection scheme generally adopts a software protection mode, so that the response speed is low, the overcurrent protection is not timely, and the reliability of the whole communication system is further reduced.
Aiming at the problems that the communication system in the prior art adopts a software control mode to perform overcurrent protection and has low response speed, an effective solution is not provided at present.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides an embodiment provides an overcurrent protection circuit and communication system to solve the communication system among the prior art, adopt software control's mode to carry out overcurrent protection, the lower problem of response speed.
For solving the technical problem, the utility model provides an overcurrent protection circuit is applied to communication system, communication system includes two at least communication nodes, and every communication node includes power supply terminal, common mode inductance and ground terminal, the power supply terminal connects gradually the first line of common mode inductance's first coil, communication bus, load, communication bus's second line common mode inductance's second coil, ground terminal, overcurrent protection circuit one-to-one sets up in every communication node, wherein includes:
and the first end of the overcurrent protection module is connected with the second coil of the common-mode inductor, the second end of the overcurrent protection module is connected with the grounding terminal, and the third end of the overcurrent protection module is connected between the power supply terminal and the first coil of the common-mode inductor and is used for controlling the communication node to be powered off when the current of the load is overlarge.
Further, the overcurrent protection module includes:
a first switch tube, the first pole of which is connected with the second coil of the common mode inductor;
a first resistor, a first end of which is connected with the first pole of the first switch tube, and a second end of which is grounded;
a second switch tube, a third pole of which is connected to a sampling point between the first switch tube and the first resistor, a second pole of which is grounded, and a first pole of which is connected between the power supply terminal and the first coil of the common mode inductor through a second resistor; the second switch tube is used for being turned off when the voltage of the sampling point is larger than a first threshold value, and then the first switch tube is controlled to be turned off, so that the communication node is controlled to be powered off.
Further, the overcurrent protection module further includes:
a third switch tube, a first pole of which is connected with the second resistor, and a second pole of which is connected with the first pole of the second switch tube;
and the input end of the MCU control chip is connected to the sampling point, and the output end of the MCU control chip is connected with the third pole of the third switch tube and is used for controlling the on-off of the third switch tube according to the voltage of the sampling point.
Further, the overcurrent protection module further includes:
and the third resistor is arranged between the output end of the MCU control chip and a third pole of the third switching tube.
Further, the overcurrent protection module further includes:
and the fourth resistor is arranged between the second pole and the third pole of the first switching tube in parallel.
Further, the overcurrent protection module further includes:
and the fifth resistor is arranged between the third pole of the second switching tube and the sampling point.
Further, the overcurrent protection circuit further includes:
and a unidirectional diode having an anode connected to the power supply terminal and a cathode connected to the first coil of the common mode inductor.
Further, the overcurrent protection circuit further includes:
and a fourth switch tube, a first pole of which is connected with the power supply terminal, a second pole of which is connected with the first coil of the common mode inductor, and a third pole of which is connected with the third end of the overcurrent protection module.
The utility model also provides a communication system, including above-mentioned overcurrent protection circuit.
Further, the communication system is an air conditioning system, the air conditioning system comprises at least two internal machines, the internal machines are connected to the communication bus, the power supply terminal, the first coil of the common mode inductor, the second coil of the common mode inductor, the grounding terminal and the overcurrent protection circuit are arranged in the internal machines, and the load is a wire controller of the air conditioning system.
Use the technical scheme of the utility model, set up the overcurrent protection module in every communication node in communication system, when the electric current of load was too big, through the communication node outage that is switching on among the overcurrent protection module control communication system, can realize realizing overcurrent protection through hardware control's mode, response speed is higher, can be more timely carry out overcurrent protection, improved whole communication system's reliability.
Drawings
Fig. 1 is a block diagram of an overcurrent protection circuit according to an embodiment of the present invention;
fig. 2 is a block diagram of an overcurrent protection circuit according to another embodiment of the present invention;
fig. 3 is a structural diagram of an air conditioning system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the embodiments of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, third, etc. may be used to describe the switch tubes in the embodiments of the present invention, the switch tubes should not be limited by these terms. These terms are only used to separate different switch regions. For example, the first switch tube may also be referred to as the second switch tube, and similarly, the second switch tube may also be referred to as the first switch tube without departing from the scope of the embodiments of the present invention.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrase "if determined" or "if detected (a stated condition or event)" may be interpreted as "upon determining" or "in response to determining" or "upon detecting (a stated condition or event)" or "in response to detecting (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an 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 article or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another like element in a commodity or device comprising the element.
The following describes in detail alternative embodiments of the present invention with reference to the accompanying drawings.
Example 1
This embodiment provides an overcurrent protection circuit, is applied to communication system, and fig. 1 is according to the utility model discloses overcurrent protection circuit's structure chart, communication system includes two at least communication nodes, and every communication node includes power supply terminal VDD, common mode inductance and ground terminal GND, power supply terminal VDD connects gradually common mode inductance's first coil L1, communication bus's first line, load, communication bus's second line common mode inductance's second coil L2, ground terminal GND still include in every communication node: the communication module is connected with the second line of the communication bus through the receiving channel, and the communication module is connected with the first line of the communication bus through the sending channel. The receiving channel comprises two capacitors connected in parallel, and the transmitting channel internally comprises two capacitors connected in parallel.
As shown in fig. 1, an overcurrent protection circuit is provided in each communication node of a communication system, and the overcurrent protection circuit includes:
and a first end of the overcurrent protection module 10 is connected with the second coil L2 of the common mode inductor, a second end of the overcurrent protection module is connected with the ground terminal GND, and a third end of the overcurrent protection module is connected between the power supply terminal VDD and the first coil L1 of the common mode inductor, so that the overcurrent protection module is used for controlling the power-off of the communication node when the current of the load is overlarge.
The overcurrent protection circuit of the embodiment is characterized in that each communication node in the communication system is provided with the overcurrent protection module, when the current of a load is too large, the overcurrent protection module controls the communication node which is powered on in the communication system to be powered off, overcurrent protection can be realized in a hardware control mode, the response speed is high, overcurrent protection can be performed more timely, and the reliability of the whole communication system is improved.
In order to control the communication node to be powered off when the current of the load is too large, as shown in fig. 1 mentioned above, the overcurrent protection module 10 includes:
a first switch tube Q1, a first pole of which is connected with a second coil L2 of the common mode inductor;
a first resistor R1 having a first end connected to the first pole of the first switch Q1 and a second end grounded;
a second switch Q2 having a third pole connected to a sampling point between the first switch Q1 and the first resistor R1, a second pole grounded, and a first pole connected between the power supply terminal VDD and the first coil L1 of the common mode inductor via a second resistor R2; the second switching tube Q2 is used for being switched off when the voltage of the sampling point is larger than a first threshold value, and then the first switching tube Q1 is controlled to be switched off, so that the communication node is controlled to be powered off.
When one of the communication nodes is in a power supply state, the first switch tube Q1 inside the communication node is in a conducting state, and the current flow direction is as follows: the power supply terminal VDD → the first coil L1 of the common mode inductor → the load → the second coil L2 of the common mode inductor → the first switching tube Q1 → the first resistor R1 → the ground terminal GND, the first resistor R1 is a current sampling resistor, and when the current of the load is increased to cause overcurrent, the voltage across the first resistor R1, that is, the voltage V of the sampling point ADC ADC Increase with increasing current if the voltage V ADC To the turn-on voltage Von (i.e., V) of the second switching tube Q2 ADC (> Von), the second switch tube Q2 is connected, the second switch tube Q2 is grounded after being connected, and the voltage drop between the emitter and the collector of the switch tube is very small, so the base voltage of the first switch tube Q1 is close to 0, the first switch tube Q1 is disconnected, the power supply loop of the communication node is disconnected, and the current flow at the moment is as follows: the power supply terminal VDD → the second resistor R2 → the second switch tube Q2 → the grounding terminal GND, and the current is introduced into the overcurrent protection circuit, so that the complex damage caused by overcurrent is avoided, and the overcurrent protection of hardware is realized.
After the hardware overcurrent protection is realized, the overcurrent protection circuit has current, and internal elements can generate heat due to electrification to consume electric energy, so that in order to avoid electric energy waste,if the voltage V of the sampling point ADC ADC And the power of the over-current protection circuit can be thoroughly controlled through software over-current protection.
Therefore, the overcurrent protection module 10 further includes: a third switching tube Q3 having a first pole connected to the second resistor R2 and a second pole connected to the first pole of the second switching tube Q2; and the input end of the MCU control chip is connected to the sampling point ADC, and the output end of the MCU control chip is connected with the third pole of the third switching tube Q3 and used for controlling the on-off of the third switching tube Q3 according to the voltage of the sampling point ADC.
After the hardware overcurrent protection is realized, if the voltage at the two ends of the first resistor R1 is larger than the voltage which is continuously increased, and when the software overcurrent protection voltage is reached, the MCU control chip actively controls the output end POWER _ CTRL to become a low level after detecting the voltage, and further controls the third switching tube Q3 to be turned off, so that the overcurrent protection module 10 is powered off, and the software overcurrent protection is realized.
In conclusion, by combining hardware overcurrent protection and software overcurrent protection, the reliability of the communication system is improved, and meanwhile, the energy-saving effect can be achieved.
In order to avoid the base current of the third switching tube Q3 being too large and burning out the third switching tube Q3, the overcurrent protection module 10 further includes: and the third resistor R3 is arranged between the output end of the MCU control chip and the third pole of the third switching tube Q3 and used for limiting the base current of the third switching tube Q3.
In order to ensure that the base voltage of the first switching tube Q1 is greater than the emitter voltage, the overcurrent protection module 10 further includes: and the fourth resistor R4 is arranged between the second pole and the third pole of the first switch tube Q1 in parallel and used for generating voltage drop so that the base voltage of the first switch tube Q1 is greater than the emitter voltage.
Similarly, in order to avoid the base current of the second switching tube Q2 being too large and burning out the second switching tube Q2, the overcurrent protection module 10 further includes:
and a fifth resistor R5 disposed between the third pole of the second switching tube Q2 and the sampling point ADC.
In order to avoid the reverse current flow, as shown in fig. 1, the overcurrent protection circuit further includes:
and a unidirectional diode D having an anode connected to the power supply terminal VDD and a cathode connected to the first coil L1 of the common mode inductor.
Example 2
As described above, the receiving channel includes two capacitors connected in parallel, and the transmitting channel includes two capacitors connected in parallel. In the above circuit scheme, if the second communication node supplies power, the first communication node is in a non-power supply state, the unidirectional diode D of the non-power supply node controls the current flowing in the power terminal, the first switch Q1 controls the power supply and non-power supply states of the communication node, when the base of the first switch Q1 inputs a high level, the communication node is in a power supply state, when the base of the first switch Q1 inputs a low level, the communication node is in a non-power supply state, and can meet the requirement of power supply interruption of the internal machine, but because the communication module is arranged on the bus of the communication system, the communication module isolates the direct current signal through the capacitor in the receiving channel and the sending channel, in the process of receiving and sending the signal by the communication module, the capacitor is in a continuous charging and discharging process, the power terminal VDD can form a current loop through the capacitor and the grounding terminal of the communication module, the current direction is as shown in fig. 1, the instantaneous power voltage is repeatedly applied to the communication module, certain damage is caused to the stability of the communication module, the service life of the communication module is influenced, and the stability of the whole communication system is further influenced; on the other hand, the power loss is caused when a loop is formed, and the electric energy is wasted.
In order to solve the problem, the present invention provides another embodiment, fig. 2 is a structural diagram of an overcurrent protection circuit according to another embodiment of the present invention, as shown in fig. 2, the overcurrent protection circuit further includes: a first pole of the fourth switching tube Q4 is connected to the power supply terminal VDD, a second pole thereof is connected to the first coil L1 of the common mode inductor, and a third pole thereof is connected to the third end of the overcurrent protection module 10. The fourth switch tube Q4 replaces a one-way diode in the figure 1, a double-tube control mode is adopted for the current flowing in the power supply terminal VDD, after the third switch tube Q3 is switched off, the fourth switch tube Q4 and the first switch tube Q1 of the power supply module are controlled to be switched off, the power supply of a communication node which does not supply power is ensured to be in a complete off state, the communication module only has communication signals, the communication module is not interfered by the power supply, and the effects of improving the reliability of the circuit and saving electric energy are achieved.
Example 3
The present embodiment provides a communication system, as shown in fig. 1 mentioned above, comprising: at least two communication nodes, every communication node includes power supply terminal VDD, common mode inductance and ground terminal GND, power supply terminal VDD connects gradually common mode inductance's first coil L1, communication bus's first line, load, communication bus's second line common mode inductance's second coil L2, ground terminal GND still include in every communication node: the communication module is connected with the second line of the communication bus through the receiving channel, and the communication module is connected with the first line of the communication bus through the sending channel. The receiving channel comprises two capacitors connected in parallel, and the transmitting channel internally comprises two capacitors connected in parallel. The overcurrent protection circuit in any embodiment is further included.
Example 4
In this embodiment, above-mentioned communication system is air conditioning system, and fig. 3 is according to the utility model discloses air conditioning system's structure chart, as shown in fig. 3, air conditioning system includes two at least internal machines, and a communication bus is shared to all internal machines, and the drive-by-wire ware inserts among the communication bus, when one of them internal machine supplied power, other internal machines were in non-power supply state.
Each internal machine is a communication node, the internal machines are connected to the communication bus, the power supply terminal GND, the first coil L1 of the common-mode inductor, the second coil L2 of the common-mode inductor, the grounding terminal GND and the overcurrent protection circuit are all arranged in the internal machines, and the load of the communication system is a wire controller of the air conditioning system.
The above-described circuit embodiments are only illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (10)
1. The utility model provides an overcurrent protection circuit, is applied to communication system, its characterized in that, communication system includes two at least communication nodes, and every communication node includes power supply terminal, common mode inductance and ground terminal, the power supply terminal connects gradually common mode inductance's first coil, communication bus's first line, load, communication bus's second line common mode inductance's second coil, ground terminal, overcurrent protection circuit one-to-one sets up in every communication node, wherein includes:
and the first end of the overcurrent protection module is connected with the second coil of the common-mode inductor, the second end of the overcurrent protection module is connected with the grounding terminal, and the third end of the overcurrent protection module is connected between the power supply terminal and the first coil of the common-mode inductor and is used for controlling the communication node to be powered off when the current of the load is overlarge.
2. The over-current protection circuit according to claim 1, wherein the over-current protection module comprises:
a first switch tube, the first pole of which is connected with the second coil of the common mode inductor;
a first resistor, a first end of which is connected with the first pole of the first switch tube, and a second end of which is grounded;
a second switch tube, a third pole of which is connected to a sampling point between the first switch tube and the first resistor, a second pole of which is grounded, and a first pole of which is connected between the power supply terminal and the first coil of the common mode inductor through a second resistor; the second switching tube is used for switching off when the voltage of the sampling point is larger than a first threshold value, and then the first switching tube is controlled to be switched off, so that the communication node is controlled to be powered off.
3. The over-current protection circuit of claim 2, wherein the over-current protection module further comprises:
a third switch tube, a first pole of which is connected with the second resistor, and a second pole of which is connected with the first pole of the second switch tube;
and the input end of the MCU control chip is connected to the sampling point, and the output end of the MCU control chip is connected with the third pole of the third switching tube and used for controlling the on-off of the third switching tube according to the voltage of the sampling point.
4. The over-current protection circuit of claim 3, wherein the over-current protection module further comprises:
and the third resistor is arranged between the output end of the MCU control chip and a third pole of the third switching tube.
5. The over-current protection circuit of claim 2, wherein the over-current protection module further comprises:
and the fourth resistor is arranged between the second pole and the third pole of the first switching tube in parallel.
6. The over-current protection circuit according to claim 2, wherein the over-current protection module further comprises:
and the fifth resistor is arranged between the third pole of the second switching tube and the sampling point.
7. The overcurrent protection circuit of any one of claims 1 to 6, further comprising:
and a unidirectional diode having an anode connected to the power supply terminal and a cathode connected to the first coil of the common mode inductor.
8. The overcurrent protection circuit of any one of claims 1 to 6, further comprising:
and a fourth switch tube, a first pole of which is connected with the power supply terminal, a second pole of which is connected with the first coil of the common mode inductor, and a third pole of which is connected with the third end of the overcurrent protection module.
9. A communication system comprising the overcurrent protection circuit of any one of claims 1 to 8.
10. The communication system according to claim 9, wherein the communication system is an air conditioning system, the air conditioning system includes at least two indoor units, the indoor units are connected to the communication bus, the power supply terminal, the first coil of the common mode inductor, the second coil of the common mode inductor, the ground terminal, and the overcurrent protection circuit are provided in the indoor units, and the load is a line controller of the air conditioning system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221786592.0U CN217956673U (en) | 2022-07-12 | 2022-07-12 | Overcurrent protection circuit and communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221786592.0U CN217956673U (en) | 2022-07-12 | 2022-07-12 | Overcurrent protection circuit and communication system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217956673U true CN217956673U (en) | 2022-12-02 |
Family
ID=84220281
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221786592.0U Active CN217956673U (en) | 2022-07-12 | 2022-07-12 | Overcurrent protection circuit and communication system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217956673U (en) |
-
2022
- 2022-07-12 CN CN202221786592.0U patent/CN217956673U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109787264B (en) | Centralized energy consumption device and control method thereof | |
| CN110323736A (en) | Power supply switch circuit and electronic equipment | |
| CN105703021B (en) | The battery management system and battery management system awakening method of low-power consumption standby | |
| CN201656779U (en) | Low power consumption standby circuit and electric appliance | |
| CN113741261A (en) | Power-on and power-off control circuit and signal output device | |
| KR102584091B1 (en) | Switch circuit and control method thereof, smart switch and control system | |
| CN217956673U (en) | Overcurrent protection circuit and communication system | |
| WO2024093528A1 (en) | Control circuit and control method for bridgeless pfc circuit, and power supply system | |
| CN217587892U (en) | Intelligent controller for Internet of things | |
| CN107181305B (en) | Energy storage circuit of single-fire bidirectional intelligent switch | |
| CN113904535B (en) | Power switch circuit and power switch | |
| CN115085143A (en) | Overcurrent protection circuit, communication system and overcurrent protection method | |
| CN109032319A (en) | A kind of backup power supply system and storage system storing equipment | |
| CN211320909U (en) | Data center micromodule power distribution system | |
| CN209748403U (en) | Dormancy control circuit and based on its modularization power | |
| CN209593094U (en) | A kind of automatic switch-over circuit of different electrical power system | |
| CN203251084U (en) | Bi-directional current limiter based on bi-directional BUCK converter | |
| CN202652057U (en) | Supply circuit for quick start of integrated circuit | |
| CN111048055A (en) | Display and display standby power consumption control method | |
| CN212083962U (en) | Switching circuit, intelligent switch and control system | |
| CN220342327U (en) | PSE equipment with automatic identification function | |
| CN109742938A (en) | A kind of anti-interference delay start control circuit and system | |
| CN215010074U (en) | Non-polar power supply circuit, electric equipment and power supply system | |
| CN109391277A (en) | A kind of cascade bus signal receiving circuit and control system | |
| CN213521382U (en) | Power supply switching circuit, wire controller and air conditioning equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |