CN221239084U - Vehicle drive shaft detection circuit - Google Patents
Vehicle drive shaft detection circuit Download PDFInfo
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- CN221239084U CN221239084U CN202323266244.8U CN202323266244U CN221239084U CN 221239084 U CN221239084 U CN 221239084U CN 202323266244 U CN202323266244 U CN 202323266244U CN 221239084 U CN221239084 U CN 221239084U
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Abstract
The utility model provides a vehicle driving shaft detection circuit which comprises an MCU circuit, an oscillation circuit, a signal frequency division circuit, an RS485 automatic receiving and transmitting circuit, a program burning interface, a communication interface, a first conversion circuit and a second conversion circuit, wherein the original circuit structure is replaced by adopting a dial switch J2 to adjust the frequency of the oscillation circuit, the detection distance and sensitivity parameters of a coil can be timely adjusted according to the field coil installation condition, a D6 air discharge tube is used for improving the lightning resistance of an external connection coil and the oscillation circuit, the signal frequency division circuit adopts two-way PWM signal sampling to improve the sampling accuracy, meanwhile, a power reset circuit of the oscillation circuit is arranged, the oscillation circuit can restart through the MCU chip U1 under the condition that the oscillation circuit stops vibrating, and an isolated power module chip U7 is arranged in the first conversion circuit to improve the lightning surge resistance of an input power supply.
Description
Technical Field
The utility model relates to the technical field of electricity, in particular to a vehicle driving shaft detection circuit.
Background
The existing recognition of the overrun overload of the truck is based on the model of the truck, so that the accurate recognition of the model of the truck is important. The vehicle type identification at the present stage is comprehensively judged in two aspects, namely the total axle number and the driving axle number of the vehicle, and the limiting weight of the driving axle is different when the total axle number is determined. The method for identifying the total axle of the vehicle is generally determined by image recognition, laser radar or axle identifier.
The oscillating circuit in the existing vehicle driving shaft detection circuit adopts a single-channel PWM to acquire signals to the singlechip, and can not carry out circuit frequency adjustment according to the installation condition of a field coil, and can not reset through the singlechip after the oscillating circuit stops vibrating, so that the high-efficiency detection requirement can not be met.
In view of the above, the present utility model provides a vehicle drive shaft detection circuit which is adjustable in frequency of an oscillating circuit, resettable in the oscillating circuit, and simple in structure.
Disclosure of utility model
According to the problems in the prior art, the utility model aims to provide a vehicle driving shaft detection circuit which comprises an MCU circuit, an oscillation circuit, a signal frequency division circuit, an RS485 automatic receiving and transmitting circuit, a program burning interface, a communication interface, a first conversion circuit and a second conversion circuit, wherein the original circuit structure is replaced, the frequency of the oscillation circuit is adjusted by adopting a dial switch J2, the detection distance and sensitivity parameters of a coil can be timely adjusted according to the field coil installation condition, a D6 air discharge tube is used, the lightning stroke resistance of an external connection coil and the oscillation circuit is improved, the signal frequency division circuit adopts double-path PWM signal sampling, the sampling accuracy is improved, meanwhile, a power reset circuit of the oscillation circuit is arranged, the oscillation circuit can restart through the MCU chip U1 under the condition that the oscillation circuit stops vibrating, an isolated power supply module chip U7 is arranged in the first conversion circuit, and the lightning stroke resistance and surge resistance of an input power supply are improved.
The utility model provides a vehicle drive axle detection circuitry, includes MCU circuit, oscillating circuit, signal frequency division circuit, RS485 automatic transceiver circuit, procedure burning interface, communication interface, first conversion circuit, second conversion circuit, its characterized in that: the first converting circuit is used for converting a 12V power supply into a 5V power supply, the second converting circuit is used for converting the 5V power supply into a 3V3 power supply, the oscillating circuit is used for generating sine wave oscillating waveforms so that an external connecting wire generates an electromagnetic field, the output end of the oscillating circuit is connected with the input end of the signal frequency dividing circuit, the signal frequency dividing circuit is used for frequency dividing and converting a high-frequency sine wave generated by the oscillating circuit into a low-frequency signal, the output end of the signal frequency dividing circuit is connected with the input end of the MCU circuit, the MCU circuit is in bidirectional connection with the RS485 automatic receiving and transmitting circuit, the RS485 automatic receiving and transmitting circuit is in bidirectional connection with the communication interface, the program burning interface is in bidirectional connection with the MCU circuit, and the program burning interface is used for downloading or/and reading a control program in the MCU chip U1 and supporting online debugging.
Further, the oscillating circuit comprises a dial switch J2 and an oscillating control circuit, the dial switch J2 is arranged on the side edge of the oscillating control circuit, the dial switch J2 is used for adjusting the frequency of the oscillating circuit, further, according to the installation condition of an external connection coil on site, the detection distance and sensitivity parameters of the external connection coil are adjusted, one output end of the oscillating control circuit is connected with the input end of the external connection coil, a D6 air discharge tube is arranged at the joint of one output end of the oscillating control circuit and the input end of the external connection coil, the D6 air discharge tube is used for improving the lightning strike resistance of the external connection coil and the oscillating circuit, the other output end of the oscillating control circuit is connected with the input end of the signal frequency dividing circuit, and the output end of the signal frequency dividing circuit is connected with the output end of the MCU circuit.
Further, the signal frequency dividing circuit comprises an NMOS tube Q1, a frequency divider U3 and a voltage stabilizing tube D4, wherein an output end of the oscillation control circuit is connected with an input end of the NMOS tube Q1, an output end of the NMOS tube Q1 is connected with an input end of the frequency divider U3, and an output end of the frequency divider U3 is connected with an input end of the MCU circuit.
Further, the frequency divider U3 converts the primary signal output by the oscillating circuit into one of a half frequency division, a quarter frequency division, and an eighth frequency division.
Further, a voltage stabilizing tube D4 is further arranged between the NMOS tube Q1 and an output end of the oscillation control circuit, and the voltage stabilizing tube D4 is used for preventing Gao Yawen waves from damaging the NMOS tube Q1, so as to protect the NMOS tube Q1.
Furthermore, the MCU circuit is also connected with a crystal oscillator circuit for providing clock frequency for the MCU chip U1, the crystal oscillator circuit is composed of a crystal oscillator X1, a capacitor C1 and a capacitor C1, and the crystal oscillator Y1, the capacitor C2 and the capacitor C4 are connected in series with the ground; the program burning interface comprises an interface J1, a1 pin of the interface J1 is connected with the output end of the second conversion circuit, a2 pin of the interface J1 is connected with a 25 pin of the MCU chip U1, a resistor R1 and a capacitor C4 are further connected between the 2 pin of the interface J1 and the 25 pin of the MCU chip U1, a resetting effect is achieved, and a 3 pin of the interface J1 is connected with a 24 pin of the MCU chip U1.
Furthermore, an oscillating circuit power supply reset circuit is also connected between the MCU circuit and the oscillating circuit, and is used for controlling the oscillating circuit power supply to reset and work again through the oscillating circuit power supply reset circuit when the oscillating circuit is stopped or overloaded, and the oscillating circuit comprises a switch current limiting flow protection chip U5.
Further, the first conversion circuit includes a capacitor C16, a capacitor C17, a capacitor C18, an isolated power module chip U7, a capacitor C19, and a capacitor C20, where the capacitor C16, the capacitor C17, and the capacitor C18 are connected in parallel and then connected to an input end of the isolated power module chip U7, the capacitor C19, the capacitor C20, the capacitor C16, and the capacitor C17 are connected in parallel and then connected to an output end of the isolated power module chip U7, a capacitor C15 is disposed between the 2 pins and the 6 pins of the isolated power module chip U7, a capacitor C24 is disposed between the 1 pin and the 7 pin of the isolated power module chip U7, and the capacitor C16, the capacitor C17, the capacitor C18, the capacitor C16, and the capacitor C17 are all aluminum electrolytic capacitors to play a filtering role, and the capacitors C15 and C24 are Y capacitors for suppressing power common mode interference.
Further, the second conversion circuit includes a buck chip U8, a capacitor C21, a capacitor C23, and a capacitor C22, where the capacitor C21 is connected to the input end of the buck chip U8, the capacitor C23 is connected to the buck chip U8, the capacitor C22 is connected to the output end of the buck chip U8, the capacitor C21 and the capacitor C22 play a filtering role, and the capacitor C23 is a noise bypass capacitor, and is used to further reduce power output noise.
Further, the RS485 automatic transceiving circuit comprises an NPN triode Q4 and a transceiver chip U6, the 3 pin of the MCU chip U1 is connected with the 3 pin of the transceiver chip U6, and a resistor R22 is arranged between the 3 pin of the MCU chip U1 and the 3 pin of the transceiver chip U6; the 2 pin of the MCU chip U1 is respectively connected with the 4 pin and the 5 pin of the transceiver chip U6, an NPN triode Q4 is arranged between the 2 pin of the MCU chip U1 and the 4 pin and the 5 pin of the transceiver chip U6, the emitter of the NPN triode Q4 is grounded, a resistor R25 is arranged between the base of the NPN triode Q4 and the 2 pin of the MCU chip U1, the collector of the NPN triode Q4 is respectively connected with the output end of the second conversion circuit and the 4 pin and the 5 pin of the transceiver chip U6, and a resistor R26 is arranged between the collector of the NPN triode Q4 and the output end of the second conversion circuit; the 4 pin of the MCU chip U1 is connected with the 6 pin of the transceiver chip U6, and a resistor R32 is arranged between the 4 pin of the MCU chip U1 and the 6 pin of the transceiver chip U6; the resistor R22, the resistor R25, the resistor R26 and the resistor R32 are pull-up resistors, the 13 pin of the transceiver chip U6 is connected with the 3 pin of the communication interface J4, a TVS diode Z1 is arranged between the 13 pin of the transceiver chip U6 and the 3 pin of the communication interface J4, the 12 pin of the transceiver chip U6 is connected with the 4 pin of the communication interface J4, a TVS diode Z2 is arranged between the 12 pin of the transceiver chip U6 and the 3 pin of the communication interface J3, and the TVS diode Z1 and the TVS diode Z2 play roles in preventing surges; the 1 foot of the transceiver chip U6 is provided with a capacitor C13, decoupling filtering is achieved, the 13 foot of the transceiver chip U6 is connected with a resistor R23, the 16 foot of the transceiver chip U6 is connected with a resistor R27, the resistor R23 is a pull-down resistor, the resistor R27 is a pull-up resistor, and the resistor R23 and the resistor R27 ensure that two transmission lines of the transceiver chip U6 have a fixed differential voltage in an idle state.
When the output of the 430_tx pin is low, the NPN transistor Q4 is turned off, so that the receiving enable RE pin and the transmitting enable DE pin of the transceiver chip U6 are pulled up by the resistor R26, the transceiver chip U6 enters a transmitting state, and at this time, the low level connected to the transmitting signal TXD pin is transmitted, so that an output corresponding to the logic low level is obtained on the differential output 485_a pin/485_b pin,
When the 430_tx pin outputs a high level, the NPN triode Q4 is turned on, so that the receiving enable RE pin and the transmitting enable DE pin of the transceiver chip U6 are pulled down by the resistor R26, the transceiver chip U6 enters a receiving state, and due to the effects of the resistor R23 and the resistor R27, the logic level on the differential output 485_a pin/485_b pin is high, so as to achieve the purpose of outputting a high level.
Further, the MCU circuit is also connected with a reserved function circuit, the reserved function circuit comprises a reserved function interface, an optocoupler switch circuit and a relay switch circuit, an output end of the reserved function interface is connected with an output end of the optocoupler switch circuit, an output end of the optocoupler switch circuit is connected with an input end of the MCU circuit, an output end of the MCU circuit is connected with an input end of the relay switch circuit, and an output end of the relay switch circuit is connected with an input end of the reserved function interface.
The beneficial effects of the utility model are as follows: a vehicle driving shaft detection circuit comprises an MCU circuit, an oscillation circuit, a signal frequency dividing circuit, an RS485 automatic receiving and transmitting circuit, a program burning interface, a communication interface, a first conversion circuit and a second conversion circuit, wherein the original circuit structure is replaced, the frequency of the oscillation circuit is adjusted through a dial switch J2, the detection distance and sensitivity parameters of a coil can be timely adjusted according to the on-site coil installation condition, a D6 air discharge tube is used, the lightning stroke resistance of an external connection coil and the oscillation circuit is improved, the signal frequency dividing circuit adopts two-way PWM signal sampling, the sampling accuracy is improved, meanwhile, a power reset circuit of the oscillation circuit is set, the oscillation circuit can restart through an MCU chip U1 under the condition that the oscillation circuit stops vibrating, an isolation power supply module chip U7 is arranged in the first conversion circuit, and the lightning stroke surge resistance of an input power supply is improved.
Drawings
Fig. 1 is a schematic diagram of a conventional vehicle drive shaft detection circuit.
Fig. 2 is a schematic diagram of the structure of the vehicle drive shaft detection circuit of the present utility model.
Fig. 3 is a schematic diagram of the MCU circuit, the oscillating circuit, and the signal dividing circuit of the vehicle drive shaft detection circuit according to the present utility model.
Fig. 4 is a schematic diagram of the configuration of the oscillating circuit power reset circuit of the vehicle drive shaft detection circuit of the present utility model.
Fig. 5 is a schematic diagram of a program recording interface and a communication interface of the vehicle driving axle detection circuit according to the present utility model.
Fig. 6 is a schematic structural diagram of an RS485 automatic transceiver circuit of the vehicle drive shaft detection circuit of the present utility model.
Fig. 7 is a schematic diagram of the first and second conversion circuits of the vehicle drive shaft detection circuit according to the present utility model.
Fig. 8 is a schematic diagram of a reserved function circuit of the vehicle drive shaft detection circuit of the present utility model.
The utility model will be further described in the following detailed description in conjunction with the above-described figures.
Detailed Description
Fig. 2 is a schematic structural diagram of a vehicle driving axle detection circuit according to the present utility model, and fig. 3 is a schematic structural diagram of an MCU circuit, an oscillating circuit, and a signal frequency dividing circuit of the vehicle driving axle detection circuit according to the present utility model; as shown in fig. 4, a schematic diagram of the structure of the oscillating circuit power reset circuit of the vehicle driving axle detection circuit according to the present utility model; fig. 5 is a schematic structural diagram of a program recording interface and a communication interface of the vehicle driving axle detection circuit according to the present utility model; as shown in fig. 6, a schematic structural diagram of an RS485 automatic transceiver circuit of the vehicle drive shaft detection circuit according to the present utility model; as shown in fig. 7, the first converting circuit and the second converting circuit of the vehicle driving axle detecting circuit according to the present utility model are schematic in structure; as shown in fig. 8, a schematic diagram of a reserved function circuit of the vehicle drive shaft detection circuit according to the present utility model is shown.
The current-limiting and current-limiting switch flow protection chip U5 chip model is SY6280AACSOT23-5USB, the transceiver chip U6 model is TDA 51S 485HC, the isolation power module chip U7 model is VRB1205S-6WR3, and a vehicle driving shaft detection circuit comprises an MCU circuit, an oscillating circuit, a signal frequency division circuit, an RS485 automatic transceiving circuit, a program burning interface, a communication interface, a first conversion circuit and a second conversion circuit, and is characterized in that: the first converting circuit is used for converting a 12V power supply into a 5V power supply, the second converting circuit is used for converting the 5V power supply into a 3V3 power supply, the oscillating circuit is used for generating sine wave oscillating waveforms so that an external connecting wire generates an electromagnetic field, the output end of the oscillating circuit is connected with the input end of the signal frequency dividing circuit, the signal frequency dividing circuit is used for frequency dividing and converting a high-frequency sine wave generated by the oscillating circuit into a low-frequency signal, the output end of the signal frequency dividing circuit is connected with the input end of the MCU circuit, the MCU circuit is in bidirectional connection with the RS485 automatic receiving and transmitting circuit, the RS485 automatic receiving and transmitting circuit is in bidirectional connection with the communication interface, the program burning interface is in bidirectional connection with the MCU circuit, and the program burning interface is used for downloading or/and reading a control program in the MCU chip U1 and supporting online debugging.
The oscillating circuit comprises a dial switch J2 and an oscillating control circuit, the dial switch J2 is arranged on the side edge of the oscillating control circuit, the dial switch J2 is used for adjusting the frequency of the oscillating circuit, further, according to the installation condition of an external connection coil on site, the detection distance and sensitivity parameters of the external connection coil are adjusted, one output end of the oscillating control circuit is connected with the input end of the external connection coil, a D6 air discharge tube is arranged at the joint of one output end of the oscillating control circuit and the input end of the external connection coil, the D6 air discharge tube is used for improving the lightning strike resistance of the external connection coil and the oscillating circuit, the other output end of the oscillating control circuit is connected with the input end of the signal frequency dividing circuit, and the output end of the signal frequency dividing circuit is connected with the output end of the MCU circuit.
The signal frequency dividing circuit comprises an NMOS tube Q1, a frequency divider U3 and a voltage stabilizing tube D4, wherein an output end of the oscillation control circuit is connected with an input end of the NMOS tube Q1, an output end of the NMOS tube Q1 is connected with an input end of the frequency divider U3, and an output end of the frequency divider U3 is connected with an input end of the MCU circuit.
The frequency divider U3 converts the original signal output by the oscillating circuit into one of half frequency division, quarter frequency division and eighth frequency division.
A voltage stabilizing tube D4 is further arranged between the NMOS tube Q1 and an output end of the oscillation control circuit, and the voltage stabilizing tube D4 is used for preventing Gao Yawen waves from damaging the NMOS tube Q1 and protecting the NMOS tube Q1.
The MCU circuit is also connected with a crystal oscillator circuit for providing clock frequency for the MCU chip U1, the crystal oscillator circuit is composed of a crystal oscillator X1, a capacitor C1 and a capacitor C1, and the crystal oscillator Y1, the capacitor C2 and the capacitor C4 are connected in series with the ground; the program burning interface comprises an interface J1, a 1 pin of the interface J1 is connected with the output end of the second conversion circuit, a 2 pin of the interface J1 is connected with a 25 pin of the MCU chip U1, a resistor R1 and a capacitor C4 are further connected between the 2 pin of the interface J1 and the 25 pin of the MCU chip U1, a resetting effect is achieved, and a3 pin of the interface J1 is connected with a 24 pin of the MCU chip U1.
And an oscillating circuit power supply reset circuit is also connected between the MCU circuit and the oscillating circuit, and is used for controlling the oscillating circuit power supply to reset and work again through the oscillating circuit power supply reset circuit when the oscillating circuit is stopped or overloaded, and the oscillating circuit comprises a switch current limiting flow protection chip U5.
The first conversion circuit comprises a capacitor C16, a capacitor C17, a capacitor C18, an isolated power supply module chip U7, a capacitor C19 and a capacitor C20, wherein the capacitor C16, the capacitor C17 and the capacitor C18 are connected in parallel and then connected with the input end of the isolated power supply module chip U7, the capacitor C19 and the capacitor C20 are connected in parallel and then connected with the output end of the isolated power supply module chip U7, a capacitor C15 is arranged between the 2 pins and the 6 pins of the isolated power supply module chip U7, a capacitor C24 is arranged between the 1 pin and the 7 pin of the isolated power supply module chip U7, the capacitor C16, the capacitor C17, the capacitor C18, the capacitor C16 and the capacitor C17 are all aluminum electrolytic capacitors for playing a filtering role, and the capacitors C15 and C24 are Y capacitors for inhibiting power supply common mode interference.
The second conversion circuit comprises a voltage reduction chip U8, a capacitor C21, a capacitor C23 and a capacitor C22, wherein the capacitor C21 is connected with the input end of the voltage reduction chip U8, the capacitor C23 is connected with the voltage reduction chip U8, the capacitor C22 is connected with the output end of the voltage reduction chip U8, the capacitor C21 and the capacitor C22 play a filtering role, and the capacitor C23 is a noise bypass capacitor and is used for further reducing power output noise.
The RS485 automatic receiving and transmitting circuit comprises an NPN triode Q4 and a transceiver chip U6, wherein the 3 pin of the MCU chip U1 is connected with the 3 pin of the transceiver chip U6, and a resistor R22 is arranged between the 3 pin of the MCU chip U1 and the 3 pin of the transceiver chip U6; the 2 pin of the MCU chip U1 is respectively connected with the 4 pin and the 5 pin of the transceiver chip U6, an NPN triode Q4 is arranged between the 2 pin of the MCU chip U1 and the 4 pin and the 5 pin of the transceiver chip U6, the emitter of the NPN triode Q4 is grounded, a resistor R25 is arranged between the base of the NPN triode Q4 and the 2 pin of the MCU chip U1, the collector of the NPN triode Q4 is respectively connected with the output end of the second conversion circuit and the 4 pin and the 5 pin of the transceiver chip U6, and a resistor R26 is arranged between the collector of the NPN triode Q4 and the output end of the second conversion circuit; the 4 pin of the MCU chip U1 is connected with the 6 pin of the transceiver chip U6, and a resistor R32 is arranged between the 4 pin of the MCU chip U1 and the 6 pin of the transceiver chip U6; the resistor R22, the resistor R25, the resistor R26 and the resistor R32 are pull-up resistors, the 13 pin of the transceiver chip U6 is connected with the 3 pin of the communication interface J4, a TVS diode Z1 is arranged between the 13 pin of the transceiver chip U6 and the 3 pin of the communication interface J4, the 12 pin of the transceiver chip U6 is connected with the 4 pin of the communication interface J4, a TVS diode Z2 is arranged between the 12 pin of the transceiver chip U6 and the 3 pin of the communication interface J3, and the TVS diode Z1 and the TVS diode Z2 play roles in preventing surges; the 1 foot of the transceiver chip U6 is provided with a capacitor C13, decoupling filtering is achieved, the 13 foot of the transceiver chip U6 is connected with a resistor R23, the 16 foot of the transceiver chip U6 is connected with a resistor R27, the resistor R23 is a pull-down resistor, the resistor R27 is a pull-up resistor, and the resistor R23 and the resistor R27 ensure that two transmission lines of the transceiver chip U6 have a fixed differential voltage in an idle state.
When the output of the 430_tx pin is low, the NPN transistor Q4 is turned off, so that the receiving enable RE pin and the transmitting enable DE pin of the transceiver chip U6 are pulled up by the resistor R26, the transceiver chip U6 enters a transmitting state, and at this time, the low level connected to the transmitting signal TXD pin is transmitted, so that an output corresponding to the logic low level is obtained on the differential output 485_a pin/485_b pin,
When the 430_tx pin outputs a high level, the NPN triode Q4 is turned on, so that the receiving enable RE pin and the transmitting enable DE pin of the transceiver chip U6 are pulled down by the resistor R26, the transceiver chip U6 enters a receiving state, and due to the effects of the resistor R23 and the resistor R27, the logic level on the differential output 485_a pin/485_b pin is high, so as to achieve the purpose of outputting a high level.
The MCU circuit is also connected with a reserved function circuit, the reserved function circuit comprises a reserved function interface, an optocoupler switch circuit and a relay switch circuit, an output end of the reserved function interface is connected with an output end of the optocoupler switch circuit, an output end of the optocoupler switch circuit is connected with an input end of the MCU circuit, an output end of the MCU circuit is connected with an input end of the relay switch circuit, and an output end of the relay switch circuit is connected with an input end of the reserved function interface.
The beneficial effects of the utility model are as follows: a vehicle driving shaft detection circuit comprises an MCU circuit, an oscillation circuit, a signal frequency dividing circuit, an RS485 automatic receiving and transmitting circuit, a program burning interface, a communication interface, a first conversion circuit and a second conversion circuit, wherein the original circuit structure is replaced, the frequency of the oscillation circuit is adjusted through a dial switch J2, the detection distance and sensitivity parameters of a coil can be timely adjusted according to the on-site coil installation condition, a D6 air discharge tube is used, the lightning stroke resistance of an external connection coil and the oscillation circuit is improved, the signal frequency dividing circuit adopts two-way PWM signal sampling, the sampling accuracy is improved, meanwhile, a power reset circuit of the oscillation circuit is set, the oscillation circuit can restart through an MCU chip U1 under the condition that the oscillation circuit stops vibrating, an isolation power supply module chip U7 is arranged in the first conversion circuit, and the lightning stroke surge resistance of an input power supply is improved.
The foregoing examples illustrate only a few embodiments of the utility model and are described in detail herein without thereby limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.
Claims (10)
1. A vehicle drive shaft detection circuit comprises an MCU circuit, an oscillation circuit, a signal frequency division circuit, an RS485 automatic receiving and transmitting circuit, a program burning interface, a communication interface, a first conversion circuit and a second conversion circuit
The conversion circuit is characterized in that: the first converting circuit is used for converting a 12V power supply into a 5V power supply, the second converting circuit is used for converting the 5V power supply into a 3V3 power supply, the oscillating circuit is used for generating sine wave oscillating waveforms so that an external connecting wire generates an electromagnetic field, the output end of the oscillating circuit is connected with the input end of the signal frequency dividing circuit, the signal frequency dividing circuit is used for frequency dividing and converting a high-frequency sine wave produced by the oscillating circuit into a low-frequency signal, the output end of the signal frequency dividing circuit is connected with the input end of the MCU circuit, the MCU circuit is in bidirectional connection with the RS485 automatic receiving and transmitting circuit, the RS485 automatic receiving and transmitting circuit is in bidirectional connection with the communication interface, the program burning interface is in bidirectional connection with the MCU circuit, and the program burning interface is used for downloading or/and reading a control program in the MCU chip U1 and supporting online debugging.
2. The vehicle drive shaft detection circuit according to claim 1, wherein the oscillation circuit comprises a dial switch J2 and an oscillation control circuit, the dial switch J2 is arranged on the side of the oscillation control circuit, the dial switch J2 is used for adjusting the frequency of the oscillation circuit, further, according to the installation condition of an external connection coil on site, the detection distance and sensitivity parameters of the external connection coil are adjusted, one output end of the oscillation control circuit is connected with the input end of the external connection coil, a D6 air discharge tube is arranged at the connection position of one output end of the oscillation control circuit and the input end of the external connection coil, the D6 air discharge tube is used for improving the lightning strike resistance of the external connection coil and the oscillation circuit, the other output end of the oscillation control circuit is connected with the input end of the signal frequency dividing circuit, and the output end of the signal frequency dividing circuit is connected with the output end of the MCU circuit.
3. The vehicle drive shaft detection circuit according to claim 1, wherein the signal frequency dividing circuit comprises an NMOS tube Q1, a frequency divider U3, and a voltage stabilizing tube D4, an output terminal of the oscillation control circuit is connected to an input terminal of the NMOS tube Q1, an output terminal of the NMOS tube Q1 is connected to an input terminal of the frequency divider U3, and an output terminal of the frequency divider U3 is connected to an input terminal of the MCU circuit.
4. A vehicle drive shaft detection circuit as set forth in claim 3 wherein said frequency divider U3 converts the primary signal output by the oscillating circuit into one of one-half frequency division or one-quarter frequency division or one-eighth frequency division.
5. The vehicle drive shaft detection circuit as set forth in claim 3, wherein a voltage regulator tube D4 is further provided between the NMOS tube Q1 and an output end of the oscillation control circuit, the voltage regulator tube D4 being configured to prevent Gao Yawen waves from damaging the NMOS tube Q1 and to protect the NMOS tube Q1.
6. The vehicle driving shaft detection circuit according to claim 1, wherein the MCU circuit is further connected with a crystal oscillator circuit for providing clock frequency for the MCU chip U1, the crystal oscillator circuit is composed of a crystal oscillator X1, a capacitor C1 and a capacitor C1, and the crystal oscillator Y1, the capacitor C2 and the capacitor C4 are connected in series to the ground; the program burning interface comprises an interface J1, a 1 pin of the interface J1 is connected with the output end of the second conversion circuit, a 2 pin of the interface J1 is connected with a 25 pin of the MCU chip U1, a resistor R1 and a capacitor C4 are further connected between the 2 pin of the interface J1 and the 25 pin of the MCU chip U1, a resetting effect is achieved, and a 3 pin of the interface J1 is connected with a 24 pin of the MCU chip U1.
7. The vehicle drive shaft detection circuit according to claim 1, wherein an oscillating circuit power supply reset circuit is further connected between the MCU circuit and the oscillating circuit, and is configured to control the oscillating circuit power supply to reset and re-operate through the oscillating circuit power supply reset circuit when the oscillating circuit is stopped or overloaded, and the oscillating circuit includes a switching current limiting flow protection chip U5.
8. The vehicle driving axle detection circuit as claimed in claim 1, wherein the first conversion circuit includes a capacitor C16, a capacitor C17, a capacitor C18, an isolated power module chip U7, a capacitor C19, a capacitor C20, a capacitor C16, a capacitor C17, and a capacitor C18 connected in parallel to an input end of the isolated power module chip U7, a capacitor C19, a capacitor C20 connected in parallel to an output end of the isolated power module chip U7, a capacitor C15 disposed between pins 2 and 6 of the isolated power module chip U7, and a capacitor C24 disposed between pins 1 and 7 of the isolated power module chip U7, wherein the capacitor C16, the capacitor C17, the capacitor C18, the capacitor C16, and the capacitor C17 are all aluminum electrolytic capacitors for filtering, and the capacitors C15 and C24 are Y capacitors for suppressing power common mode interference.
9. The vehicle drive shaft detection circuit as set forth in claim 1, wherein the second conversion circuit includes a buck chip U8, a capacitor C21, a capacitor C23, and a capacitor C22, the capacitor C21 is connected to an input terminal of the buck chip U8, the capacitor C23 is connected to the buck chip U8, the capacitor C22 is connected to an output terminal of the buck chip U8, the capacitor C21 and the capacitor C22 perform a filtering function, and the capacitor C23 is a noise bypass capacitor for further reducing power output noise.
10. The vehicle drive shaft detection circuit according to claim 1, wherein the RS485 automatic receiving and transmitting circuit comprises an NPN triode Q4, a transceiver chip U6, a 3 pin of the MCU chip U1 is connected with a 3 pin of the transceiver chip U6, and a resistor R22 is arranged between the 3 pin of the MCU chip U1 and the 3 pin of the transceiver chip U6; the 2 pin of the MCU chip U1 is respectively connected with the 4 pin and the 5 pin of the transceiver chip U6, an NPN triode Q4 is arranged between the 2 pin of the MCU chip U1 and the 4 pin and the 5 pin of the transceiver chip U6, the emitter of the NPN triode Q4 is grounded, a resistor R25 is arranged between the base of the NPN triode Q4 and the 2 pin of the MCU chip U1, the collector of the NPN triode Q4 is respectively connected with the output end of the second conversion circuit and the 4 pin and the 5 pin of the transceiver chip U6, and a resistor R26 is arranged between the collector of the NPN triode Q4 and the output end of the second conversion circuit; the 4 pin of the MCU chip U1 is connected with the 6 pin of the transceiver chip U6, and a resistor R32 is arranged between the 4 pin of the MCU chip U1 and the 6 pin of the transceiver chip U6; the resistor R22, the resistor R25, the resistor R26 and the resistor R32 are pull-up resistors, the 13 pin of the transceiver chip U6 is connected with the 3 pin of the communication interface J4, a TVS diode Z1 is arranged between the 13 pin of the transceiver chip U6 and the 3 pin of the communication interface J4, the 12 pin of the transceiver chip U6 is connected with the 4 pin of the communication interface J4, a TVS diode Z2 is arranged between the 12 pin of the transceiver chip U6 and the 3 pin of the communication interface J3, and the TVS diode Z1 and the TVS diode Z2 play roles in preventing surges; the 1 foot of the transceiver chip U6 is provided with a capacitor C13, decoupling filtering is achieved, the 13 foot of the transceiver chip U6 is connected with a resistor R23, the 16 foot of the transceiver chip U6 is connected with a resistor R27, the resistor R23 is a pull-down resistor, the resistor R27 is a pull-up resistor, and the resistor R23 and the resistor R27 ensure that two transmission lines of the transceiver chip U6 have a fixed differential voltage in an idle state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323266244.8U CN221239084U (en) | 2023-12-01 | 2023-12-01 | Vehicle drive shaft detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323266244.8U CN221239084U (en) | 2023-12-01 | 2023-12-01 | Vehicle drive shaft detection circuit |
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| Publication Number | Publication Date |
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| CN221239084U true CN221239084U (en) | 2024-06-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323266244.8U Active CN221239084U (en) | 2023-12-01 | 2023-12-01 | Vehicle drive shaft detection circuit |
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| CN (1) | CN221239084U (en) |
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