CN205178876U - Power switching circuit is used in drive of on -vehicle low -frequency antenna - Google Patents
Power switching circuit is used in drive of on -vehicle low -frequency antenna Download PDFInfo
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- CN205178876U CN205178876U CN201521072199.5U CN201521072199U CN205178876U CN 205178876 U CN205178876 U CN 205178876U CN 201521072199 U CN201521072199 U CN 201521072199U CN 205178876 U CN205178876 U CN 205178876U
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- triode
- frequency antenna
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Abstract
The utility model discloses a power switching circuit is used in drive of on -vehicle low -frequency antenna installs the low -frequency antenna on the car, LDO converts 12V into 8.5V and carries to triode Q1's projecting pole to through resistance R2 connection triode Q1's base, electric capacity C1 and resistance R1, two series -opposing connection diode D1 constitute parallel circuit, MCU output square wave warp parallel circuit is connected to triode Q1's base, triode Q1's collecting electrode connect the low -frequency antenna input. The utility model has the advantages of require not high occasion can replace special level conversion IC in the frequency, have the cost advantage. Through adjustment to R1R2 can realize arbitrary input voltage to output voltage V's conversion, the range of application is wider.
Description
Technical field
The utility model relates to power circuit field, particularly relates to the circuit module that Vehicular direct-current 5V turns 8.5V.
Background technology
Current automobile function trends towards intelligent development.PEPS technology is one of them, and when user steps into specified scope, system detects user position by low-frequency antenna, can identify the driver of mandate and automatic door opening, once get on the bus, as long as flicking start button, just can rise and normally start vehicle.
Low-frequency antenna drives and needs 125K square wave, and driving voltage is larger in theory, and signal strength signal intensity is better, and induction range is larger.Passenger car is generally+12V system, if use booster circuit, then cost is higher.The stability requirement of antenna to driving voltage is higher simultaneously, and after vehicle launch, battery voltage ripple is comparatively large, therefore should not be directly battery-powered.
Utility model content
Technical problem to be solved in the utility model realizes a kind of power circuit being applied to vehicle-mounted low-frequency antenna and driving, and can utilize LDO that 12V is converted to 8.5V.
To achieve these goals, the technical solution adopted in the utility model is: a kind of vehicle-mounted low-frequency antenna driving power change-over circuit, automobile is provided with low-frequency antenna, 12V is converted to the emitter that 8.5V is delivered to triode Q1 by LDO, and pass through the base stage of resistance R2 connecting triode Q1, electric capacity C1 and resistance R1, two differential concatenation diode D1 form parallel circuits, MCU exports square wave is connected to triode Q1 base stage through described parallel circuits, and the collector electrode of described triode Q1 connects described low-frequency antenna input.
The collector electrode of described triode Q1 is through resistance R3 ground connection.
Described triode Q1 is PNP triode BC807.
The Selecting parameter of components and parts is with during without triode Q1, and resistance R2 two ends pressure drop is less than 0.4V when 125K_PWM signal is high level, and being greater than 0.8V when 125K_PWM signal is low level is principle, determines the resistance of resistance R1 and resistance R2 thus.
The utility model has the advantage of that the occasion frequency requirement is not high can replace special level conversion IC, have cost advantage.Through realizing the conversion of any input voltage to output voltage V to the adjustment of R1/R2, range of application is wider.
Accompanying drawing explanation
Below the content that width accompanying drawing every in the utility model specification is expressed is briefly described:
Fig. 1 is power-switching circuit schematic diagram.
Embodiment
The utility model adopts LDO that 12V is converted to 8.5V.125K square wave is provided by MCU, and this MCU is 5V system, therefore adopts change-over circuit to complete the control of the many low-frequency antennas of MCU.LDO and lowdropoutregulator is a kind of low pressure difference linear voltage regulator, is relative to traditional linear voltage regulator.
Components and parts are selected: D1:BAV99 (dividing potential drop and temperature-compensating), Q1:PNP triode BC807 (switching levels), C1:100P (speed-up capacitor)
Operation principle: because vary with temperature, the Vbe pressure drop of triode Q1 can change, so mislead at high or low temperatures to prevent.The Selecting parameter of components and parts (resistance R1 and resistance R2) is with during without Q1, the pressure drop of R2 two ends is less than 0.4V when 125K_PWM signal is high level, being greater than 0.8V when 125K_PWM signal is low level is principle, determines the resistance of resistance R1 and resistance R2 thus.Simple use electric resistance partial pressure cannot reach above requirement, therefore increases diode D1 for compensating.Such as resistance R1 selects 6.8k Ω, and resistance R2 selects 750 Ω, and resistance R3 selects 1k Ω.
Because the response of semiconductor device to signal has time delay, for reducing time delay as much as possible.Increase day safe C1 and be used for Acceleration of starting.Changing voltage adopts PNP triode but not PMOS, has more cost advantage.
By reference to the accompanying drawings the utility model is exemplarily described above; obvious the utility model specific implementation is not subject to the restrictions described above; as long as have employed the improvement of the various unsubstantialities that method of the present utility model is conceived and technical scheme is carried out; or design of the present utility model and technical scheme directly applied to other occasion, all within protection range of the present utility model without to improve.
Claims (3)
1. a vehicle-mounted low-frequency antenna driving power change-over circuit, automobile is provided with low-frequency antenna, it is characterized in that: 12V is converted to the emitter that 8.5V is delivered to triode Q1 by LDO, and pass through the base stage of resistance R2 connecting triode Q1, electric capacity C1 and resistance R1, two differential concatenation diode D1 form parallel circuits, MCU exports square wave is connected to triode Q1 base stage through described parallel circuits, and the collector electrode of described triode Q1 connects described low-frequency antenna input.
2. vehicle-mounted low-frequency antenna driving power change-over circuit according to claim 1, is characterized in that: the collector electrode of described triode Q1 is through resistance R3 ground connection.
3. vehicle-mounted low-frequency antenna driving power change-over circuit according to claim 2, is characterized in that: described triode Q1 is PNP triode BC807.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521072199.5U CN205178876U (en) | 2015-12-18 | 2015-12-18 | Power switching circuit is used in drive of on -vehicle low -frequency antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521072199.5U CN205178876U (en) | 2015-12-18 | 2015-12-18 | Power switching circuit is used in drive of on -vehicle low -frequency antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205178876U true CN205178876U (en) | 2016-04-20 |
Family
ID=55742806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521072199.5U Expired - Fee Related CN205178876U (en) | 2015-12-18 | 2015-12-18 | Power switching circuit is used in drive of on -vehicle low -frequency antenna |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205178876U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105553253A (en) * | 2015-12-18 | 2016-05-04 | 埃泰克汽车电子(芜湖)有限公司 | Power conversion circuit for driving vehicle-mounted low-frequency antenna |
-
2015
- 2015-12-18 CN CN201521072199.5U patent/CN205178876U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105553253A (en) * | 2015-12-18 | 2016-05-04 | 埃泰克汽车电子(芜湖)有限公司 | Power conversion circuit for driving vehicle-mounted low-frequency antenna |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160420 Termination date: 20161218 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |