CN215897706U - Matching circuit of communication interface and vehicle-mounted water pump - Google Patents
Matching circuit of communication interface and vehicle-mounted water pump Download PDFInfo
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- CN215897706U CN215897706U CN202122054948.3U CN202122054948U CN215897706U CN 215897706 U CN215897706 U CN 215897706U CN 202122054948 U CN202122054948 U CN 202122054948U CN 215897706 U CN215897706 U CN 215897706U
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Abstract
The embodiment of the utility model discloses a matching circuit of a communication interface and a vehicle-mounted water pump, wherein the circuit comprises: at least one matching module, the module comprising a first transistor, a second transistor, a filter capacitor, a pull-up resistor and a first resistor; the control end of the first transistor is used as the control end of the matching module, the first end of the first transistor is grounded, and the second end of the first transistor is electrically connected with the first end of the first resistor; the first end of the filter capacitor is electrically connected with the second end of the first transistor, and the second end of the filter capacitor is in short circuit with the first end of the pull-up resistor and then serves as the output end of the matching module; the control end of the second transistor is electrically connected with the first end of the first resistor, the first end of the second transistor is electrically connected with the second end of the pull-up resistor, and the second end of the second transistor is in short circuit with the second end of the first resistor and then serves as a power supply end of the matching module; compared with the prior art, the embodiment of the utility model improves the driving capability and the filtering performance of the communication interface matching circuit.
Description
Technical Field
The embodiment of the utility model relates to a communication interface circuit technology, in particular to a matching circuit of a communication interface and a vehicle-mounted water pump.
Background
Because the division of the automobile industry is getting finer and finer, a device with the same function meets the requirements of different communication lines facing different customers, and the modification of the design scheme aiming at each application scene is not beneficial to large-scale production.
The elements of the communication interface circuit in the prior art are not matched, and the compatibility is poor, so that the debugging time of the circuit in the initial research and development stage is too long, the research and development efficiency is low, and the batch production of products is not facilitated. Due to the phenomenon, the cost is increased correspondingly in the links of research and development, production, storage and the like.
SUMMERY OF THE UTILITY MODEL
The utility model provides a matching circuit of a communication interface and a vehicle-mounted water pump, which are used for optimizing the driving capability and the filtering performance of a communication circuit.
In a first aspect, an embodiment of the present invention provides a matching circuit of a communication interface, where the matching circuit includes:
at least one matching module comprising a first transistor, a second transistor, a filter capacitor, a pull-up resistor, and a first resistor;
the control end of the first transistor is used as the control end of the matching module, the first end of the first transistor is grounded, and the second end of the first transistor is electrically connected with the first end of the first resistor; the first end of the filter capacitor is electrically connected with the second end of the first transistor, and the second end of the filter capacitor is in short circuit with the first end of the pull-up resistor and then serves as the output end of the matching module; the control end of the second transistor is electrically connected with the first end of the first resistor, the first end of the second transistor is electrically connected with the second end of the pull-up resistor, and the second end of the second transistor is in short circuit with the second end of the first resistor and then serves as the power supply end of the matching module; the output end of the at least one matching module is electrically connected with the communication interface; the second transistor is used for conducting when the potential of the control end of the second transistor is smaller than that of the first end of the second transistor.
Optionally, the matching module further comprises:
and the second end of the first transistor is electrically connected with the first end of the first resistor through the second resistor.
Optionally, the first transistor comprises one of: NPN transistor, N-MOS pipe, field effect transistor and insulated gate bipolar transistor, the second transistor includes one of following: PNP transistor, P-MOS pipe, field effect transistor and insulated gate bipolar transistor.
Optionally, the matching circuit further comprises:
the control module comprises at least one control signal output end, the at least one control signal output end is electrically connected with the control end of the at least one matching module in a one-to-one correspondence mode, and the control module is used for controlling the conduction state of the first transistor in the matching module.
Furthermore, the control module is a single chip microcomputer, an MCU or an FPGA.
Optionally, the matching circuit further comprises: and the power ends of the at least one matching module are electrically connected with the power supply.
Optionally, the matching circuit includes at least two matching modules, and the resistance values of the pull-up resistors in the at least two matching modules are different; the capacitance values of the filter capacitors in the at least two matching modules are different.
Optionally, the matching circuit includes at least two matching modules, and the resistance values of the pull-up resistors in the at least two matching modules are the same; the capacitance values of the filter capacitors in the at least two matching modules are the same.
Further, the model of the first transistor, the model of the second transistor, and the resistance of the first resistor in the at least two matching modules are the same.
In a second aspect, an embodiment of the present invention further provides a vehicle-mounted water pump, where the vehicle-mounted water pump includes a communication interface and a matching circuit of any one of the communication interfaces provided in the embodiment of the first aspect of the present invention; and the output end of the at least one matching module is electrically connected with the communication interface.
The utility model provides a matching circuit of a communication interface, which is controlled by a transistor or other elements, provides a pull-up resistor or a filter capacitor which is flexibly controlled under the condition of not influencing the function of the original circuit, and can change the driving capability and the filtering performance of the matching circuit of the communication interface through signal control.
Drawings
Fig. 1 is a matching circuit diagram of a communication interface according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a communication interface matching circuit with a control module according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The embodiment of the utility model provides a matching circuit of a communication interface, which can be applied to a vehicle-mounted water pump. Fig. 1 is a matching circuit diagram of a communication interface according to an embodiment of the present invention. Referring to fig. 1, the matching circuit includes: at least one matching module.
Each matching module (matching module 1, matching module 2, … … matching module N) includes a first transistor Q2, a second transistor Q4, a filter capacitor C2, a pull-up resistor R6, and a first resistor R4; a control terminal of the first transistor Q2 is used as a control terminal CTRL1 of the corresponding matching block, a first terminal of the first transistor Q1 is grounded, and a second terminal of the first transistor Q2 is electrically connected to a first terminal of the first resistor R4; the first end of the filter capacitor C2 is electrically connected with the second end of the first transistor Q2, and the second end of the filter capacitor C2 is in short circuit with the first end of the pull-up resistor R6 and then serves as the output end of the corresponding matching module; a control end of the second transistor Q4 is electrically connected with a first end of the first resistor R4, a first end of the second transistor Q4 is electrically connected with a second end of the pull-up resistor R6, and a second end of the second transistor Q4 is short-circuited with a second end of the first resistor R4 to serve as a power supply end VS of a corresponding matching module; the output end of at least one matching module is electrically connected with the communication interface COM; the second transistor Q4 is used to turn on when its control terminal potential is less than its first terminal potential.
The at least one matching module means that the number of the matching modules may be one or more, and the specific number is not limited in the embodiment of the present invention. The embodiment specifically takes the matching module 1 as an example for description, but those skilled in the art will understand that the utility model is not limited to the matching module 1. The matching modules 1, 2 and N in fig. 1 have the same function, and may be selected to be used alone or not, or may even be used in a superimposed manner.
When the control terminal CTL1 of the matching module 1 is at a low level, and the first transistor Q2 and the second transistor Q4 in the matching module 1 do not satisfy the trigger condition, the output terminal of the matching module 1 is electrically connected to the communication interface COM, and at this time, the pull-up resistor R6 and the filter capacitor C2 are equivalently not connected to the communication interface COM. When the control terminal CTL1 of the matching module 1 is at a high level or other logic level, the first transistor Q2 in the matching module 1 is turned on, so that the first terminal of the filter capacitor C2 is grounded, that is, the filter capacitor C2 filters a signal of the communication interface COM, that is, the filter capacitor C2 in the matching module 1 is an effective filter capacitor at this time; meanwhile, the power supply terminal VS of the matching module 1 is grounded through the first resistor R4, so that the potential of the control terminal of the second transistor Q4 is smaller than the potential of the first terminal thereof, the second transistor Q4 is turned on, the second terminal of the pull-up resistor R6 is turned on with the power supply terminal VS, and the pull-up resistor R6 provides a pull-up function for the communication interface COM, that is, the pull-up resistor R6 in the matching module 1 is an effective pull-up resistor at this time. Different control signals can be applied to the control ends of the matching modules, so that whether the pull-up resistor and the filter capacitor in each matching module are effective or not is controlled, the total value of the filter capacitor and the total value of the pull-up resistor which are connected into the communication interface are controlled, and the communication interface is better matched. Compared with the prior art, the embodiment of the utility model controls through the transistor and other elements, provides a pull-up resistor or a filter capacitor which is flexibly controlled, and changes the driving capability and the filtering performance of the communication circuit through signal control.
The utility model provides a matching circuit of a communication interface, which comprises: the matching module comprises a first transistor, a second transistor, a filter capacitor, a pull-up resistor and a first resistor; the control end of the first transistor is used as the control end of the matching module, the first end of the first transistor is grounded, and the second end of the first transistor is electrically connected with the first end of the first resistor; the first end of the filter capacitor is electrically connected with the second end of the first transistor, and the second end of the filter capacitor is in short circuit with the first end of the pull-up resistor and then serves as the output end of the matching module; the control end of the second transistor is electrically connected with the first end of the first resistor, the first end of the second transistor is electrically connected with the second end of the pull-up resistor, and the second end of the second transistor is in short circuit with the second end of the first resistor and then serves as a power supply end of the matching module; the output end of at least one matching module is electrically connected with the communication interface; the second transistor is used for conducting when the potential of the control end of the second transistor is smaller than that of the first end of the second transistor. Different control signals can be applied to the control ends of the matching modules, so that whether the pull-up resistor and the filter capacitor in each matching module are effective or not is controlled, the value of the total filter capacitor and the value of the total pull-up resistor accessed to the communication interface are further controlled, and the communication interface is better matched; the pull-up resistor or the filter capacitor which is flexibly controlled is provided, and the driving capability and the filtering performance of the communication interface matching circuit can be changed through signal control.
Optionally, the matching module 1 further comprises: a second resistor R3, wherein the second terminal of the first transistor Q2 is electrically connected to the first terminal of the first resistor R4 through a second resistor R3.
Specifically, the current limiting effect of the second resistor R3 can be used to avoid the excessive current at the control end of the second transistor Q4, and ensure the stable operation of the second transistor Q4. The first transistor includes one of: NPN transistor, N-MOS transistor, field effect transistor and insulated gate bipolar transistor the second transistor comprises one of: PNP transistor, P-MOS pipe, field effect transistor and insulated gate bipolar transistor.
The NPN type triode is formed by clamping a P type semiconductor between two N type semiconductors; the PNP type triode is a triode formed by clamping an N type semiconductor between two P type semiconductors, and can also be described as a triode in which current flows from an emitter E. The NPN type transistor and the PNP type transistor are the most important devices in an electronic circuit, and the most important functions thereof are current amplification and switching.
The triode has NPN type and PNP type, and similarly, the MOS tube also has N channel and P channel, three pins of the triode are respectively a base B, a collector C and an emitter E, and three pins of the MOS tube are respectively a grid G, a drain D and a source S. In a general electronic circuit, a MOS transistor is generally used for an amplifying circuit or a switching circuit.
The field effect transistor has the characteristics of high input impedance, low noise, high limit frequency, low power consumption, simple manufacturing process, good temperature characteristic and the like, and is widely applied to various amplifying circuits, digital circuits, microwave circuits and the like.
The insulated gate bipolar transistor integrates the advantages of a power transistor and a power field effect transistor, has good characteristics and is wide in application field. An insulated gate bipolar transistor is also a three-terminal device: a gate, a collector and an emitter.
Preferably, the first transistor is an NPN transistor, and the second transistor is a PNP transistor. The first transistor is an NPN transistor, and when the NPN base is high in voltage, the collector and the emitter are short-circuited. At low voltage, the collector and emitter are open-circuited and are in an off state. The second transistor is a PNP transistor, the PNP base electrode is high in voltage, the collector electrode and the emitter electrode are open-circuited, and the second transistor is in a non-working state. If the base is applied with a low voltage, the collector is short-circuited with the emitter.
Optionally, the matching circuit further comprises: the control module comprises at least one control signal output end, the at least one control signal output end is electrically connected with the control end of the at least one matching module in a one-to-one correspondence mode, and the control module is used for controlling the conduction state of the first transistor in the matching module. Specifically, the control module may be, for example, a single chip microcomputer, an MCU, or an FPGA. The control module is mainly used for providing a low level or providing a high level, and the high level can be 5V or other logic levels, so that the transistors in the matching module are driven to be switched on or switched off. The control module is a single chip microcomputer, a Micro Controller Unit (MCU) or a Field Programmable Gate Array (FPGA).
Exemplarily, referring to fig. 2, fig. 2 is a circuit diagram of a communication interface matching circuit with a control module according to an embodiment of the present invention. The control module comprises at least two control signal output ends, the at least two control signal output ends mean that the number of the signal output ends can be two or more, and the embodiment of the utility model does not limit the specific number. The control signal output end is correspondingly and electrically connected with the control end of the matching module, and the control module is used for controlling the conduction state of the first transistor in the matching module.
When the control signal CTL1 output by the control module 201 is at a low level (e.g., 0V), the level of the control terminal of the first transistor Q2 in the matching module 1 is lower than the level of the second terminal thereof, the level of the control terminal of the second transistor Q4 is higher than the level of the first terminal thereof, both the first transistor Q2 and the second transistor Q4 are turned off, the module is in an off state, and the presence of the first resistor R4 prevents the module from being turned on by mistake when the module is in the off state.
When the control signal CTL1 output by the control module 201 is at a high level (e.g., 5V) or other logic level, the level of the control terminal of the first transistor Q2 in the matching module 1 is greater than the level of the second terminal thereof, the first transistor Q2 is in a conducting state, and the negative terminal of the filter capacitor C2 is grounded through the first transistor Q2. Meanwhile, the current generated by the power source VS passes through the first resistor R4, the second resistor R3 and the first transistor Q2, and the first end of the first transistor Q2 is grounded to GND to form a path. At this time, the control terminal of the second transistor Q4 is lower than the first terminal thereof, so that the second transistor Q4 is turned on, and at this time, the current generated by the power supply passes through the second transistor Q4, the pull-up resistor R6, and finally the output terminal of the matching module 1 is electrically connected to the communication interface COM, and the matching module 1 is in an on state.
Optionally, the matching circuit further comprises: and the power ends of the at least one matching module are electrically connected with the power supply.
And the power ends of at least one matching module are electrically connected with the power supply. At least one matching module means that the number of matching modules may be one or more, and the embodiment of the present invention does not limit the specific number. Illustratively, referring to fig. 2, the power terminals VS of the matching module 1 and the matching module 2 are electrically connected to a power supply.
Optionally, the matching circuit includes at least two matching modules, and the resistance values of the pull-up resistors in the at least two matching modules are different; the capacitance values of the filter capacitors in the at least two matching modules are different.
The resistance values of the pull-up resistors in the at least two matching modules are different from the capacitance values of the filter capacitors, so that the matching modules are prevented from being miscalculated due to the fact that the resistance values and the capacitance values are the same, circuit misconduction in the matching modules is caused, the matching modules can be flexibly configured, and more humanized selection is provided.
Optionally, the matching circuit includes at least two matching modules, and the resistance values of the pull-up resistors in the at least two matching modules are the same; the capacitance values of the filter capacitors in the at least two matching modules are the same.
The resistance values of the pull-up resistors in the at least two matching modules are the same as the capacitance values of the filter capacitors, so that the matching modules can be conveniently produced in batch, and errors caused by different element resistance values or different capacitance values are avoided.
Further, the model of the first transistor, the model of the second transistor, and the resistance of the first resistor in the at least two matching modules are the same.
The model of the first transistor, the model of the second transistor and the resistance of the first resistor in the at least two matching modules are the same, so that the mass production of products can be promoted, the compatibility of the products can be improved, the debugging time is shortened, and the research and development efficiency is accelerated.
The utility model provides a matching circuit of a communication interface, which is controlled by a transistor or other elements, provides a pull-up resistor or a filter capacitor which is flexibly controlled under the condition of not influencing the function of the original circuit, can control signals by a control module, and enhances the driving capability and the filtering performance of the matching circuit of the communication interface.
The embodiment of the utility model also provides a vehicle-mounted water pump, wherein the vehicle-mounted water pump comprises a communication interface and a matching circuit of any communication interface provided by the embodiment of the utility model; and the output end of the at least one matching module is electrically connected with the communication interface. The matching circuit of the communication interface provided by any embodiment of the utility model is included, so that the same beneficial effects are achieved, and the details are not repeated herein.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A matching circuit for a communication interface, the matching circuit comprising:
at least one matching module comprising a first transistor, a second transistor, a filter capacitor, a pull-up resistor, and a first resistor;
the control end of the first transistor is used as the control end of the matching module, the first end of the first transistor is grounded, and the second end of the first transistor is electrically connected with the first end of the first resistor; the first end of the filter capacitor is electrically connected with the second end of the first transistor, and the second end of the filter capacitor is in short circuit with the first end of the pull-up resistor and then serves as the output end of the matching module; the control end of the second transistor is electrically connected with the first end of the first resistor, the first end of the second transistor is electrically connected with the second end of the pull-up resistor, and the second end of the second transistor is in short circuit with the second end of the first resistor and then serves as the power supply end of the matching module; the output end of the at least one matching module is electrically connected with the communication interface; the second transistor is used for conducting when the potential of the control end of the second transistor is smaller than that of the first end of the second transistor.
2. The matching circuit of a communication interface of claim 1, wherein the matching module further comprises:
and the second end of the first transistor is electrically connected with the first end of the first resistor through the second resistor.
3. The matching circuit of claim 1, wherein the first transistor comprises one of: NPN transistor, N-MOS transistor, field effect transistor and insulated gate bipolar transistor the second transistor comprises one of: PNP transistor, P-MOS pipe, field effect transistor and insulated gate bipolar transistor.
4. The matching circuit of a communication interface of claim 1, wherein the matching circuit further comprises:
the control module comprises at least one control signal output end, the at least one control signal output end is electrically connected with the control end of the at least one matching module in a one-to-one correspondence mode, and the control module is used for controlling the conduction state of the first transistor in the matching module.
5. The matching circuit of claim 4, wherein the control module is a single chip, MCU or FPGA.
6. The matching circuit of a communication interface of claim 1, wherein the matching circuit further comprises: and the power ends of the at least one matching module are electrically connected with the power supply.
7. The matching circuit of claim 1, wherein the matching circuit comprises at least two matching modules, and the pull-up resistors in the at least two matching modules have different resistances; the capacitance values of the filter capacitors in the at least two matching modules are different.
8. The matching circuit of claim 1, wherein the matching circuit comprises at least two matching modules, and the pull-up resistors in the at least two matching modules have the same resistance; the capacitance values of the filter capacitors in the at least two matching modules are the same.
9. The matching circuit of claim 8, wherein the type of the first transistor, the type of the second transistor, and the resistance of the first resistor in the at least two matching modules are the same.
10. An on-board water pump, characterized in that it comprises a communication interface and a matching circuit of the communication interface according to any one of claims 1 to 9; and the output end of the at least one matching module is electrically connected with the communication interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122054948.3U CN215897706U (en) | 2021-08-27 | 2021-08-27 | Matching circuit of communication interface and vehicle-mounted water pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122054948.3U CN215897706U (en) | 2021-08-27 | 2021-08-27 | Matching circuit of communication interface and vehicle-mounted water pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215897706U true CN215897706U (en) | 2022-02-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122054948.3U Active CN215897706U (en) | 2021-08-27 | 2021-08-27 | Matching circuit of communication interface and vehicle-mounted water pump |
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| CN (1) | CN215897706U (en) |
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2021
- 2021-08-27 CN CN202122054948.3U patent/CN215897706U/en active Active
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