CN208956015U - A kind of onboard wireless transmit circuit - Google Patents
A kind of onboard wireless transmit circuit Download PDFInfo
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- CN208956015U CN208956015U CN201821832992.4U CN201821832992U CN208956015U CN 208956015 U CN208956015 U CN 208956015U CN 201821832992 U CN201821832992 U CN 201821832992U CN 208956015 U CN208956015 U CN 208956015U
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- crystal oscillator
- wireless transmit
- transmit circuit
- onboard wireless
- power supply
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Abstract
The utility model discloses a kind of onboard wireless transmit circuit, and the crystal oscillator including being connected with power supply is provided with the capacitor and inductance for filtering, and the resistance for current limliting between the power supply and crystal oscillator；It is connected between modulation wave signal input terminal and crystal oscillator by triode, transistor base connects modulation wave signal input terminal, and collector connects crystal oscillator, emitter ground connection；The crystal oscillator output end is connected with the transmitting antenna with LC resonance circuit, and crystal oscillator output end is also connected with the capacitor for filtering.The onboard wireless transmit circuit, limitation of the input signal without driving aspect, RF signal are controlled by crystal oscillator and are issued, and clutter is few, and circuit structure is simple, without additional RF driving chip.
Description
Technical field
The present invention relates to vehicle security drive equipment technical field, specifically a kind of onboard wireless transmit circuit.
Background technique
TPMS is system for monitoring pressure in tyre, is a kind of using Radio Transmission Technology, using being fixed in automobile tire
High-sensitivity miniature wireless sensing device data such as acquisition automotive tire pressure, temperature in the state of driving a vehicle or is static, and will
Data transmission is into the indoor host of driving, the dependency numbers such as real-time display automotive tire pressure and temperature in the form of digitized
According to, and prompting driver carries out the automobile active safety system of early warning in the form of buzzing or voice etc. when tire occurs abnormal.
So that it is guaranteed that the pressure and temperature of tire maintains in critical field, the probability for reducing tire of blowing out, ruin is played, reduces oil consumption and vehicle
The damage of component.
With the development of construction, road it is unimpeded, TPMS using more and more extensive.There are many forms by TPMS, but no matter
Which kind of form is required to carry out signal transmission, the following radio transmitter application certainty using radio transmitter
Occupy unshakable a part.
433.92M radio application range has been widely, to be both the free frequency range of ISM, have itself unique
Advantage, distance is remote, penetration power is strong, diffracting power is outstanding, and using small data quantity application, which can be used in the sensing of TPMS
Device carries out data acquisition and various automation controls etc..
Transmit circuit importation needs RF driving chip in existing TPMS, and input signal is driven limitation.Tradition
Transmit circuit need additional setting coded integrated circuits, with other regular coding circuits, rolling code circuit and interface microcontroller
Connection.
Summary of the invention
Goal of the invention: the purpose of the present invention is providing a kind of onboard wireless transmit circuit for the deficiency in current technology,
Limitation of the input signal without driving aspect, RF signal are controlled by crystal oscillator and are issued, and clutter is few, and circuit structure is simple, without additional
RF driving chip.
Technical solution: to achieve the above object, the present invention provides a kind of onboard wireless transmit circuit, including is connected with power supply
Crystal oscillator, the capacitor and inductance for filtering, and the resistance for current limliting are provided between the power supply and crystal oscillator；Modulating wave
It is connected between signal input part and crystal oscillator by triode, transistor base connects modulation wave signal input terminal, collector connection
Crystal oscillator, emitter ground connection；The crystal oscillator output end is connected with the transmitting antenna with LC resonance circuit, and crystal oscillator output end is also connected with
There is the capacitor for filtering.
As a kind of improvement of this programme, the crystal oscillator output end is connected with triode and is controlled.
As a kind of improvement of this programme, the crystal oscillator frequency is 433.92MHz.
As a kind of improvement of this programme, it is 3-12V that the power supply, which provides operating voltage range,.
As a kind of improvement of this programme, it is 3.6V that the power supply, which provides operating voltage,.
The utility model has the advantages that onboard wireless transmit circuit of the present invention, structure is simple, limit of the input signal without driving aspect
System, RF signal are controlled by crystal oscillator and are issued, and clutter is few.Crystal oscillation signal output end does not set coded integrated circuits, and increases one three
Pole pipe, this structure it can be convenient and other regular coding circuits, rolling code circuit and interface microcontroller, without
Consider the operating voltage of coding circuit and the size of output amplitude signal value.
Wider 3~12V of operating voltage range can be used in the transmit circuit, and when voltage change, tranmitting frequency is basic
It is constant.Receiving module matched with transmit circuit can be received steadily without any adjustment.By repetition test, when transmitting electricity
When pressure is 3V, 100 meters of field transmission range or more, transmission power is smaller；When 200 meters of voltage 5V transmission range or more；Work as electricity
500 meters of transmission range or more when pressing 9V；When emitting voltage is 12V, it is optimum operating voltage, there is preferable launching effect,
About 60 milliamperes of emission current, one kilometer of field transmission range or more, about 500 milliwatt of transmission power.The function when voltage is greater than l2V
Consumption increases, and effective transmission power no longer significantly improves.The characteristics of transmit circuit is that transmission power is bigger, transmission range ratio
Farther out, relatively it is suitble to be communicated under mal-condition.When being used for TPMS, requirement can be met using the power supply of 3.6V.
Detailed description of the invention
Fig. 1, the onboard wireless transmit circuit structural schematic diagram.
Specific embodiment
With reference to the accompanying drawings and detailed description, the present invention is furture elucidated, it should be understood that following specific embodiments are only
For illustrating the present invention rather than limiting the scope of the invention.It should be noted that word " preceding " used in the following description,
" rear ", "left", "right", "up" and "down" refer to that the direction in attached drawing, word "inner" and "outside" refer respectively to direction or remote
Direction from geometric center of specific component.
It is a kind of onboard wireless transmit circuit as shown in Figure 1, the crystal oscillator including being connected with power supply, crystal oscillator frequency is
433.92MHz, the band inductance L1 that connects after parallel connection two capacitors C1, C2 there are three connector, after power supply are filtered；R1 resistance
For current limliting, inductance L1 connects crystal oscillator connector 1 with resistance R1, and the both ends capacitor C3 are separately connected crystal oscillator connector 1 and connector 3, inductance
The one end L2 connects resistance R1, crystal oscillator interface 1, interface 2 and triode Q1 base stage, and the other end connects capacitor 4 and triode Q1 current collection
Pole is connected with antenna after capacitor 4；Triode Q1 emitter connects crystal oscillator connector 3；3 connecting triode Q2 collector of crystal oscillator connector,
Modulation wave signal input terminal is connected after triode Q2 base stage connecting resistance R2；Triode Q2 emitter ground connection.Modulation wave signal input
End is grounded by capacitor C5.It is 3.6V that power supply, which provides operating voltage,.
C1, C2, L1 are power filter, and R1 is current-limiting resistance, and the input signal of modulation wave signal input terminal is three poles of control
The switching signal of pipe Q2 can be used as the power ground of 433.92MHz crystal oscillator after its amplification, crystal oscillator made to reach the shape of normal work
State.Q1 is the output end of crystal oscillator, and the LC resonance circuit that control L2 and C4 are constituted can make modulated signal carry out power amplification and generate
High_frequency sine wave RF signal.C3 is filter capacitor, this capacitor can filter out the clutter of crystal oscillator generation.
The technical means disclosed in the embodiments of the present invention is not limited only to technological means disclosed in above embodiment, further includes
Technical solution consisting of any combination of the above technical features.
Claims (5)
1. a kind of onboard wireless transmit circuit, which is characterized in that the crystal oscillator including being connected with power supply, between the power supply and crystal oscillator
It is provided with the capacitor and inductance for filtering, and the resistance for current limliting；Pass through between modulation wave signal input terminal and crystal oscillator
Triode connection, transistor base connect modulation wave signal input terminal, and collector connects crystal oscillator, emitter ground connection；The crystal oscillator
Output end is connected with the transmitting antenna with LC resonance circuit, and crystal oscillator output end is also connected with the capacitor for filtering.
2. a kind of onboard wireless transmit circuit as described in claim 1, it is characterised in that: the crystal oscillator output end is connected with three
Pole pipe is controlled.
3. a kind of onboard wireless transmit circuit as claimed in claim 2, it is characterised in that: the crystal oscillator frequency is
433.92MHz。
4. a kind of onboard wireless transmit circuit as claimed in claim 3, it is characterised in that: the power supply provides operating voltage
Range is 3-12V.
5. a kind of onboard wireless transmit circuit as claimed in claim 4, it is characterised in that: the power supply provides operating voltage and is
3.6V。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821832992.4U CN208956015U (en) | 2018-11-08 | 2018-11-08 | A kind of onboard wireless transmit circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821832992.4U CN208956015U (en) | 2018-11-08 | 2018-11-08 | A kind of onboard wireless transmit circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208956015U true CN208956015U (en) | 2019-06-07 |
Family
ID=66744295
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821832992.4U Active CN208956015U (en) | 2018-11-08 | 2018-11-08 | A kind of onboard wireless transmit circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208956015U (en) |
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2018
- 2018-11-08 CN CN201821832992.4U patent/CN208956015U/en active Active
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