CN116346106A - Switch signal control circuit - Google Patents
Switch signal control circuit Download PDFInfo
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- CN116346106A CN116346106A CN202310198349.XA CN202310198349A CN116346106A CN 116346106 A CN116346106 A CN 116346106A CN 202310198349 A CN202310198349 A CN 202310198349A CN 116346106 A CN116346106 A CN 116346106A
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- Prior art keywords
- triode
- transistor
- resistor
- grid
- control circuit
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- 239000003990 capacitor Substances 0.000 abstract description 26
- 230000007547 defect Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/60—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
- H03K17/6871—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors the output circuit comprising more than one controlled field-effect transistor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Electronic Switches (AREA)
Abstract
A signal input or output end is connected to a source electrode of a triode Q1 and a source electrode of a triode O2 respectively, a drain electrode of the triode Q1 is connected with a drain electrode of the triode Q2, a grid electrode of the triode Q1 is grounded through a capacitor C1, a grid electrode of the triode Q2 is grounded through a capacitor C2, one end of a resistor R1 is connected between the grid electrode of the triode Q1 and the capacitor C1, one end of the resistor R2 is connected between the grid electrode of the triode Q2 and the capacitor C2, the other end of the resistor R1 is connected with the other end of the resistor R2, a grid electrode of the triode Q4 is connected with a grid electrode of the triode Q3, a drain electrode of the triode Q3 is connected between the resistor R1 and the resistor R2, a power input end is connected with a drain electrode of the triode Q3 through the resistor R3, a source electrode of the triode Q3 is connected with a-3.3V level through the resistor R4, a source electrode of the triode Q3 is connected with a-3.3V level, and a source electrode of the triode Q4 is connected with a +3V level, so that the triode Q1 and the triode Q2 can switch signals.
Description
Technical Field
The invention relates to the technical field of automobile detection, in particular to a switch signal control circuit.
Background
Currently, an OBD is a fully-known vehicle-mounted diagnostic system, and an OBD detection device CAN detect a plurality of systems and components of a vehicle, including an engine, a catalytic converter, a particle catcher, an oxygen sensor, an emission control system, a fuel system, an EGR and the like, wherein the OBD is connected to an electronic control unit ECU through various emission-related component information, the ECU has the function of detecting and analyzing emission-related faults, however, automobiles of different factories are provided with the functions of individual pins, protocols of each factory are different, such as a CAN (controller area network), a J1850 (controller area network) and a K_LINE (controller area network), the baud rate and the voltage of the protocols are larger, such as the 500K with the 33K with the voltage of only about 5V, but the voltage of the K_LINE is about 12V with the larger phase difference, and a relay is used for switching the signals, but the relay is large in size and high in cost.
Disclosure of Invention
The invention aims to solve the technical problems that when the existing relay is adopted to switch signals according to different protocols adopted by OBD individual pins of automobiles of different manufacturers, the relay has the defects of large volume and high cost, and provides a switch signal control circuit.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the utility model provides a switch signal control circuit, switch signal control circuit is used for on-vehicle OBD, including triode Q1, triode Q2, triode Q3, triode Q4, electric capacity C1, electric capacity C2, resistance R1, resistance R2, resistance R3 and resistance R4, triode Q1's source with triode O2's source is connected signal input or output IN/OUT respectively, triode Q1's drain electrode with triode Q2's drain electrode is connected, triode Q1's grid passes through electric capacity C1 ground connection, triode Q2's grid passes through electric capacity C2 ground connection, resistance R1's one end is connected triode Q1's grid with between electric capacity C1, resistance R2's one end is connected between triode Q2's grid with electric capacity C2, resistance R1's the other end with resistance R2's the other end is connected, triode Q4's grid connection selection signal SELECT, triode Q4's drain electrode with the drain electrode is connected with triode Q2's drain electrode is connected through electric capacity C2, and the drain electrode is connected with resistance Q3.3, and the drain electrode is connected through the electric capacity Q3V 3, and the drain electrode is connected between Q3.3.
Further, the triode Q1 is a PMOS tube.
Further, the triode Q2 is a PMOS tube.
Further, the triode Q4 is a PMOS tube.
Further, the triode Q3 is an NMOS tube.
Compared with the prior art, the switch signal control circuit provided by the invention comprises a triode Q1, a triode Q2, a triode Q3, a triode Q4, a capacitor C1, a capacitor C2, a resistor R1, a resistor R2, a resistor R3 and a resistor R4, wherein the source electrode of the triode Q1 and the source electrode of the triode O2 are respectively connected with a signal input or output end IN/OUT, the drain electrode of the triode Q1 is connected with the drain electrode of the triode Q2, the grid electrode of the triode Q1 is grounded through the capacitor C1, the grid electrode of the triode Q2 is grounded through the capacitor C2, one end of the resistor R1 is connected between the grid electrode of the triode Q1 and the capacitor C1, one end of the resistor R2 is connected between the grid electrode of the triode Q2 and the capacitor C2, the other end of the resistor R1 is connected with the other end of the resistor R2, the grid electrode of the triode Q4 is connected with a selection signal SELECT, the drain electrode of the triode Q4 is connected between the resistor R1 and the drain electrode of the resistor R2, the drain electrode of the triode Q3 is connected with the power supply end IN_with the grid electrode of the triode Q3 through the resistor V3, and the grid electrode of the triode Q3 is connected with the level of the triode Q3, and the grid electrode of the triode Q3 is connected with the level 3.3 through the grid electrode of the resistor Q3. In this example, the transistor Q4 is a control MOS transistor, if the SELECT signal SELECT is at a low level, the transistor Q4 is turned on, a +3.3v voltage is applied to the gate of the transistor Q3, at this time, the transistor Q3 is turned on, and-3.3v passes through the transistor Q3 and the resistor R1 to turn on the transistor Q1, and also passes through the transistor Q3 and the resistor R2 to turn on the transistor Q2, at this time, the circuit can pass through the signal; if the SELECT signal SELECT is high, the transistor Q4 will be turned off, -3.3V pulls the gate of the transistor Q3 to-3.3V through the resistor R4, so that the transistor Q3 is not turned on, at this time, the voltage of the power input terminal vcc_in makes the gate of the transistor Q1 high through the resistor R3 and the resistor R1, the transistor Q1 will be turned off, and likewise, the voltage of the power input terminal vcc_in makes the gate of the transistor Q2 high through the resistor R3 and the resistor R2, the transistor Q2 will also be turned off, so that the transistor Q1 and the transistor Q2 play a role of signal switch, and signal switching can be effectively performed through the transistor Q1 and the transistor Q2, so that the defects of large relay volume and high cost existing when the existing relay is used for signal switching for different protocols of OBD individual pins of automobiles of different manufacturers are effectively solved.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a switch signal control circuit according to the present embodiment.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The implementation of the present invention is described in detail below in connection with specific embodiments.
As shown IN fig. 1, IN the embodiment of the present invention, a switching signal control circuit is provided, the switching signal control circuit is used for on-vehicle OBD, the switching signal control circuit includes a transistor Q1, a transistor Q2, a transistor Q3, a transistor Q4, a capacitor C1, a capacitor C2, a resistor R1, a resistor R2, a resistor R3 and a resistor R4, a source of the transistor Q1 and a source of the transistor O2 are respectively connected to a signal input or output terminal IN/OUT, the signal input or output terminal is used for signal input or signal output, a drain of the transistor Q1 is connected to a drain of the transistor Q2, a gate of the transistor Q1 is grounded through the capacitor C1, a gate of the transistor Q2 is grounded through the capacitor C2, one end of the resistor R1 is connected between the gate of the transistor Q1 and the capacitor C1, one end of the resistor R2 is connected between the gate of the transistor Q2 and the capacitor C2, another end of the resistor R1 is connected to the gate of the resistor R3, another end of the resistor R2 is connected to the gate of the transistor Q3, and the other end of the resistor R3 is connected to the drain of the transistor Q3, and the resistor 3 is connected to the drain of the resistor 3, and the transistor Q3 is connected to the drain of the resistor 3.
In this example, the transistor Q4 is a control MOS transistor, if the SELECT signal SELECT is at a low level, the transistor Q4 is turned on, a +3.3v voltage is applied to the gate of the transistor Q3, at this time, the transistor Q3 is turned on, and-3.3v passes through the transistor Q3 and the resistor R1 to turn on the transistor Q1, and also passes through the transistor Q3 and the resistor R2 to turn on the transistor Q2, at this time, the circuit can pass through the signal; if the SELECT signal SELECT is high, the transistor Q4 will be turned off, -3.3V pulls the gate of the transistor Q3 to-3.3V through the resistor R4, so that the transistor Q3 is not turned on, at this time, the voltage of the power input terminal vcc_in makes the gate of the transistor Q1 high through the resistor R3 and the resistor R1, the transistor Q1 will be turned off, and likewise, the voltage of the power input terminal vcc_in makes the gate of the transistor Q2 high through the resistor R3 and the resistor R2, the transistor Q2 will also be turned off, so that the transistor Q1 and the transistor Q2 play a role of signal switch, and signal switching can be effectively performed through the transistor Q1 and the transistor Q2, so that the defects of large relay volume and high cost existing when the existing relay is used for signal switching for different protocols of OBD individual pins of automobiles of different manufacturers are effectively solved.
It should be noted that, in this embodiment, because the signal frequency is relatively high, such as the CAN signal of 500K, the parasitic capacitance of the triode Q1 affects the gate of the triode Q1 and the parasitic capacitance of the triode Q2 affects the gate of the triode Q2 due to the fast band change of the signal, so the gate of the triode Q1 is grounded through the capacitor C1, the capacitor C1 is added to stabilize the gate of the triode Q1 against the signal, the gate of the triode Q2 is grounded through the capacitor C2, and the capacitor C1 is added to stabilize the gate of the triode Q1 against the signal.
In this embodiment, the transistor Q1 is a PMOS transistor.
In this embodiment, the transistor Q2 is a PMOS transistor.
In this embodiment, the transistor Q4 is a PMOS transistor.
In this embodiment, the transistor Q3 is an NMOS transistor.
The working principle of the switch signal control circuit of the invention is as follows:
when the SELECT signal SELECT is low, the transistor Q4 is turned on, a +3.3v voltage is applied to the gate of the transistor Q3, and the transistor Q3 is turned on, and-3.3v passes through the transistor Q3 and the resistor R1 to turn on the transistor Q1, and also passes through the transistor Q3 and the resistor R2 to turn on the transistor Q2, and the circuit can pass through the signal;
when the SELECT signal SELECT is high, the transistor Q4 is turned off, -3.3V pulls the gate of the transistor Q3 to-3.3V through the resistor R4, so that the transistor Q3 is turned off, at this time, the voltage of the power input terminal vcc_in makes the gate of the transistor Q1 high through the resistor R3 and the resistor R1, the transistor Q1 is turned off, and likewise, the voltage of the power input terminal vcc_in makes the gate of the transistor Q2 high through the resistor R3 and the resistor R2, and the transistor Q2 is also turned off;
thus, the transistor Q1 and the transistor Q2 function as signal switches, and signal switching can be effectively performed through the transistor Q1 and the transistor Q2.
Compared with the prior art, the switch signal control circuit provided by the invention comprises a triode Q1, a triode Q2, a triode Q3, a triode Q4, a capacitor C1, a capacitor C2, a resistor R1, a resistor R2, a resistor R3 and a resistor R4, wherein the source electrode of the triode Q1 and the source electrode of the triode O2 are respectively connected with a signal input or output end, the drain electrode of the triode Q1 is connected with the drain electrode of the triode Q2, the grid electrode of the triode Q1 is grounded through the capacitor C1, the grid electrode of the triode Q2 is grounded through the capacitor C2, one end of the resistor R1 is connected between the grid electrode of the triode Q1 and the capacitor C1, one end of the resistor R2 is connected between the grid electrode of the triode Q2 and the capacitor C2, the other end of the resistor R1 is connected with the other end of the resistor R2, the grid electrode of the triode Q4 is connected with a signal selection signal, the drain electrode of the triode Q4 is connected between the resistor R1 and the resistor R2, the drain electrode of the triode Q3 is connected with the power input end of the triode Q3 through the resistor R3, the power supply input end of the triode Q3 is connected with the level of the voltage level of the triode Q3 and the voltage level of the triode Q3 is connected with the grid electrode of the triode Q3, and the level of the triode Q3 is connected with the level of the triode Q3 and the level is connected with the triode Q3. In this example, the transistor Q4 is a control MOS transistor, if the SELECT signal SELECT is at a low level, the transistor Q4 is turned on, a +3.3v voltage is applied to the gate of the transistor Q3, at this time, the transistor Q3 is turned on, and-3.3v passes through the transistor Q3 and the resistor R1 to turn on the transistor Q1, and also passes through the transistor Q3 and the resistor R2 to turn on the transistor Q2, at this time, the circuit can pass through the signal; if the SELECT signal SELECT is high, the transistor Q4 will be turned off, -3.3V pulls the gate of the transistor Q3 to-3.3V through the resistor R4, so that the transistor Q3 is not turned on, at this time, the voltage of the power input terminal vcc_in makes the gate of the transistor Q1 high through the resistor R3 and the resistor R1, the transistor Q1 will be turned off, and likewise, the voltage of the power input terminal vcc_in makes the gate of the transistor Q2 high through the resistor R3 and the resistor R2, the transistor Q2 will also be turned off, so that the transistor Q1 and the transistor Q2 play a role of signal switch, and signal switching can be effectively performed through the transistor Q1 and the transistor Q2, so that the defects of large relay volume and high cost existing when the existing relay is used for signal switching for different protocols of OBD individual pins of automobiles of different manufacturers are effectively solved.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (5)
1. The utility model provides a switch signal control circuit, switch signal control circuit is used for on-vehicle OBD, its characterized IN that includes triode Q1, triode Q2, triode Q3, triode Q4, electric capacity C1, electric capacity C2, resistance R1, resistance R2, resistance R3 and resistance R4, triode Q1's source with triode O2's source is connected signal input or output IN/OUT respectively, triode Q1's drain electrode with triode Q2's drain electrode is connected, triode Q1's grid passes through electric capacity C1 ground connection, triode Q2's grid passes through electric capacity C2 ground connection, resistance R1's one end is connected triode Q1's grid with between electric capacity C1, resistance R2's one end is connected between triode Q2's grid with electric capacity C2, resistance R1's the other end with resistance R2's the other end is connected, triode Q4's grid connection selection signal SELECT 4's drain electrode with triode Q2's drain electrode is connected, triode Q4's grid electrode passes through electric capacity C2 is connected with the grid electrode 3, and is connected to triode Q3, and is connected through the grid electrode 3.3-3.
2. The switching signal control circuit of claim 1, wherein the transistor Q1 is a PMOS transistor.
3. The switching signal control circuit of claim 1, wherein the transistor Q2 is a PMOS transistor.
4. The switching signal control circuit of claim 1, wherein the transistor Q4 is a PMOS transistor.
5. The switching signal control circuit of claim 1, wherein the transistor Q3 is an NMOS transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310198349.XA CN116346106A (en) | 2023-03-03 | 2023-03-03 | Switch signal control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310198349.XA CN116346106A (en) | 2023-03-03 | 2023-03-03 | Switch signal control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116346106A true CN116346106A (en) | 2023-06-27 |
Family
ID=86884978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310198349.XA Pending CN116346106A (en) | 2023-03-03 | 2023-03-03 | Switch signal control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116346106A (en) |
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2023
- 2023-03-03 CN CN202310198349.XA patent/CN116346106A/en active Pending
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