CN104333214A - Vehicle-mounted DC power supply conversion interface module based on 555 timer - Google Patents
Vehicle-mounted DC power supply conversion interface module based on 555 timer Download PDFInfo
- Publication number
- CN104333214A CN104333214A CN201410600659.0A CN201410600659A CN104333214A CN 104333214 A CN104333214 A CN 104333214A CN 201410600659 A CN201410600659 A CN 201410600659A CN 104333214 A CN104333214 A CN 104333214A
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- circuit
- power supply
- interface module
- vehicle
- module based
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
- H03K19/017509—Interface arrangements
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H5/00—One-port networks comprising only passive electrical elements as network components
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- Computer Hardware Design (AREA)
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- Computing Systems (AREA)
- General Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a vehicle-mounted DC power supply conversion interface module based on 555 timer, and the vehicle-mounted DC power supply conversion interface module based on 555 timer comprises a filter circuit, a power supply noise amplifying circuit, a control signal generating circuit and a control circuit; the filter circuit is RC high pass filter circuit, the power supply noise amplifying circuit is two-grade triode amplifying circuit, the control signal generating circuit is the single stable state trigger circuit composed of 555 timer, the control circuit is the field effect pipe control circuit. The vehicle-mounted DC power supply conversion interface module based on 555 timer is simple in circuit, low in cost, small in volume, real time in signal process and fast in response speed, there is no dead halt phenomenon; the vehicle-mounted electronic device can automatically open and shut off the power supply for electronic equipment along the start and stop of the vehicle, the power supply for electronic equipment is not inserted or pulled out continually for saving the electric energy and reducing the vehicle device waste.
Description
Technical field
The present invention relates to electronic technology field, particularly Vehicular direct-current power supply correlation technique.
Background technology
Present automobile generally all can be equipped with picture has drive recorder, navigator, the vehicle electronic device of needs long-term work during vehicle travels that cyberdog etc. is such.When using these electronic equipments, above the cigar lighter generally all needing manually the power line of equipment to be connected to automobile or diagnostics port power supply transfer mouth.And the cigar lighter socket of automobile and the DC power supply of diagnostics port are long-term outputs.This just needs electronic equipment manually to pull out power line when not using, with electrical energy saving and proterctive equipment.
Power supply noise is the one of electromagnetic interference, and the frequency spectrum of its conducted noise is roughly 10kHz ~ 30MHz, reaches as high as 150MHz.Power supply noise, particularly transient noise interference, its rate of climb is fast, the duration is short, voltage amplitude amplitude is high, randomness strong, easily produces severe jamming to microcomputer and digital circuit.
The DC power supply that automobile carries all can include power supply noise.The voltage peak-to-peak value of power supply noise when automobile flameout has positive and negative about 10 millivolts, during automobilism, and power supply noise voltage peak-to-peak value is at positive and negative more than 100 millivolts.Car direct current power supply power supply noise peak-to-peak value after automobile starting travels exceeds about 100 millivolts than automobile flameout state.
Technology contents
The DC power supply carried based on deficiency and the automobile of above-mentioned technology at automobile in huge difference that is flame-out and power supply noise voltage peak-to-peak value when running, the object of the invention is, amplitude is separated from DC power supply more than 100 millivolts of power supply noises, through signal shaping amplify after so that produce a control signal, judge whether automobile starts, and then whether control power module produces output; Namely prove that automobile is not activated when automobile power source power supply noise is less than 100 millivolts, just do not export car direct current power supply, automobile startup optimization is proved when automobile power source power supply noise is greater than 100 millivolts, just export car direct current power supply, to realize allowing vehicle electronic device follow the startup of automobile and to stop working and automatically open and turn off electronic equipment power source, thus eliminate the process of removable electronic device power supply (DPS) continually.
The object of the invention is to be achieved through the following technical solutions, a kind of Vehicular direct-current Power convert interface module based on 555 timers, described module includes:
Filter circuit, for the collection of car direct current power supply power supply noise;
Power supply noise amplifying circuit, for amplifying power supply noise;
Control signal produces circuit, for by the power supply noise after amplifying through this circuit, obtain an amplitude comparatively large, the square-wave signal that pulse duration is adjustable, i.e. control signal;
Whether control circuit, have output for the power supply controlling automobile power source port.
The described Vehicular direct-current Power convert interface module based on 555 timers, its filter circuit is RC high pass wave circuit.
The described Vehicular direct-current Power convert interface module based on 555 timers, its power supply noise amplifying circuit is two-stage transistor amplifier.
The described Vehicular direct-current Power convert interface module based on 555 timers, it is the monostable flipflop circuit be made up of 555 timers that its control signal produces circuit.
The described Vehicular direct-current Power convert interface module based on 555 timers, its control circuit is field effect transistor control circuit.
The invention has the advantages that circuit element is few, circuit is simple, and cost is low, and volume is little, and processing signals is real-time, and fast response time, does not exist deadlock phenomenon; And realize allowing vehicle electronic device follow the startup of automobile and to stop working and automatically open and turn off electronic equipment power source, thus eliminate the process of removable electronic device power supply (DPS) continually, achieve saves energy and decrease automobile equipment and waste.
Accompanying drawing explanation
Fig. 1 is schematic block diagram of the present invention;
Fig. 2 is workflow schematic diagram of the present invention;
Fig. 3 is integrated circuit schematic diagram of the present invention;
Fig. 4 is the monostable flipflop control circuit schematic diagram that use 555 timer chip of the present invention is built;
Fig. 5 is Fig. 4 circuit specific works waveform schematic diagram;
Fig. 6 is filter circuit of the present invention is RC high pass wave circuit schematic diagram;
Fig. 7 is power supply noise amplifying circuit of the present invention is two-stage transistor amplifier schematic diagram;
Fig. 8 is control circuit of the present invention is field effect transistor control circuit schematic diagram.
Embodiment:
As shown in Figure 1, Figure 2, Figure 3 shows, filtered electrical routing capacitor C3 of the present invention and resistor R2 forms; Power supply noise amplifying circuit of the present invention is by capacitor C7, and resistor R5, R6, R8, R9, NPN type triode Q1, Q2 form.Control signal of the present invention produces electric routing capacitor C1, C2, and resistor R1, U1 timer chip 555 forms.Control circuit of the present invention is by N channel field-effect pipe Q3, Q4, and resistor R3 forms.Power supply noise amplifying circuit of the present invention and control signal produce the power supply modulate circuit of circuit by U2 three-terminal voltage-stabilizing chip 7805, and capacitor C4, C6 form.
In the present invention, 12V or the 24V DC power supply that automobile exports accesses the Vehicular direct-current Power convert interface module based on 555 timers through supply socket J1.1 pin of supply socket J1 connects input 1 pin of three-terminal voltage-stabilizing chip U2, and through the conditioning of U2,3 pin of U2 export the voltage of+5V to other circuit supplies.1 pin of supply socket J1 connects the input of RC circuit of high pass filter, and+the 12V that automobile exports or+24V DC power supply obtain the power supply noise of power supply after capacitor C3.The power supply noise amplitude sampled is greater than 50 millivolts.This power supply noise is input to the one-level see-saw circuit be made up of triode Q2 after resistance R2 current limliting, signal is exaggerated 160 times, then export the signal after amplifying through electric capacity C7, the secondary see-saw circuit of this signal again through being made up of triode Q1, signal is exaggerated 160 times again.The signal finally obtained is about 5V, then input 2 pin of 555 chips is input to (because 555 timer chips require that input signal will have certain voltage amplitude, if so the signal being input to 555 chips is more weak, the input so with regard to delivering to 555 after needing the DC power supply noise signal of input to amplify again.）
As shown in Figure 4, Figure 5, the monostable flipflop control circuit for building with 555 timer chips.As long as the input of this circuit 2 pin will export the pulse control signal of a low height change at output 3 pin when being checked through the pulse of the such change of end height.
The pulse control signal of the low height change of the output 3 pin Vo output of 555 chips receives the field effect transistor Q3 of soft switch circuit and the grid of Q4, and then controls the break-make of field effect transistor.Field effect transistor input drain electrode connect be car direct current.The delivery outlet socket that what the output source electrode of field effect transistor connected is " the Vehicular direct-current Power convert interface modules based on 555 timers ".What delivery outlet socket connected is the power line of vehicle electronics product;
Out-put supply interface socket J3 exports direct current+12V and after field effect transistor Q3, exports direct current+5V to+24V, J2 after field effect transistor Q4.
As shown in Figure 6, for filter circuit of the present invention is RC high pass wave circuit schematic diagram.The amplitude of the power supply noise regulating input amplifying circuit is realized by the resistance of regulating resistance R2.
As shown in Figure 7, for power supply noise amplifying circuit of the present invention is two-stage transistor amplifier schematic diagram; Its course of work is: triode Q2 and resistance R8, R9 and capacitor C7 form one-level see-saw circuit.Triode Q1 and resistance R5, R6 form secondary see-saw circuit.
Due to the effect of pull-up resistor R9, the base stage of diode Q2 has the voltage of 5V, makes diode Q2 be in conducting state.
Peak-to-peak value 100 millivolts of power supply noises that RC filter circuit exports are input to one-level see-saw circuit through the base stage of triode Q2.Because the voltage amplification factor of triode 8050 is about 160, so power supply noise signal becomes the noise signal (because the power supply of amplifying circuit is 5V, so the output signal amplitude maximum of amplifying circuit is suitable with power supply) of peak-to-peak value 5V after one-level see-saw circuit exports.The noise signal of peak-to-peak value 5V is after capacitor C7, and filtering flip-flop, outputs by the anti-phase power supply noise signal be exaggerated of one-level.
Then secondary see-saw circuit is input to by the anti-phase power supply noise signal be exaggerated of one-level.Because the noise signal being input to secondary see-saw circuit has had certain amplitude, so can directly make diode Q1 conducting and be amplified.
The reason one increasing second amplifying circuit peak-to-peak value can be made to be less than 50 millivolts of power noises can be amplified further; Two are through twice anti-phase amplification, and the noise signal exported from secondary see-saw circuit just keeps same-phase with the waveform of one-level see-saw circuit input.If the input signal sampled like this is high level, so outputing signal also is high level, if the input signal sampled is low level, so outputing signal also is low level.
As shown in Figure 8, for control circuit of the present invention is field effect transistor control circuit schematic diagram.It is made up of N channel field-effect pipe Q3, Q4 and resistance R3, and its course of work is:
The grid of N channel field-effect pipe is if low level, and so the drain-to-source of N channel field-effect pipe is with regard to not conducting.If the grid of contrary N channel field-effect pipe is high level, so the drain-to-source of N channel field-effect pipe is with regard to conducting.
The grid of N channel field-effect pipe Q3, Q4 is pulled down to ground by resistance R3, makes the grid of Q3, Q4 be all low level at ordinary times.The drain-to-source not conducting at ordinary times of such N channel field-effect pipe Q3, Q4, module exports no-voltage.
When 3 pin output low level of 555 chips in control circuit, the grid of Q3, Q4 is made to be all low level.The drain-to-source not conducting of such N channel field-effect pipe Q3, Q4, module source socket J2, J3 export no-voltage.
When 3 pin of 555 chips in control circuit export high level, make to produce pressure drop above resistance R3, also make the grid of Q3, Q4 be all high level.Drain-to-source all conductings of such N channel field-effect pipe Q3, Q4, module source socket J2, J3 export+12 of correspondence to+24V and+5V voltage.
Claims (5)
1., based on a Vehicular direct-current Power convert interface module for 555 timers, it is characterized in that, described module includes:
Filter circuit, for the collection of car direct current power supply power supply noise;
Power supply noise amplifying circuit, for amplifying power supply noise;
Control signal produces circuit, for by the power supply noise after amplifying through this circuit, obtain an amplitude comparatively large, the square-wave signal that pulse duration is adjustable, i.e. control signal;
Whether control circuit, have output for the power supply controlling automobile power source port.
2. the Vehicular direct-current Power convert interface module based on 555 timers according to claim 1, is characterized in that: described filter circuit is RC high pass wave circuit.
3. the Vehicular direct-current Power convert interface module based on 555 timers according to claim 1 and 2, it is characterized in that, described power supply noise amplifying circuit is two-stage transistor amplifier.
4. the Vehicular direct-current Power convert interface module based on 555 timers according to claim 1, is characterized in that: it is the monostable flipflop circuit be made up of 555 timers that described control signal produces circuit.
5. the Vehicular direct-current Power convert interface module based on 555 timers according to claim 1 and 2, it is characterized in that, described control circuit is field effect transistor control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410600659.0A CN104333214A (en) | 2014-10-31 | 2014-10-31 | Vehicle-mounted DC power supply conversion interface module based on 555 timer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410600659.0A CN104333214A (en) | 2014-10-31 | 2014-10-31 | Vehicle-mounted DC power supply conversion interface module based on 555 timer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104333214A true CN104333214A (en) | 2015-02-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410600659.0A Pending CN104333214A (en) | 2014-10-31 | 2014-10-31 | Vehicle-mounted DC power supply conversion interface module based on 555 timer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109586394A (en) * | 2018-12-03 | 2019-04-05 | 陕西理工大学 | A kind of automobile data recorder power supply circuit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100502720B1 (en) * | 2004-08-30 | 2005-07-20 | 노하우뱅크(주) | Power control device in an automobile |
| CN1808150A (en) * | 2005-01-18 | 2006-07-26 | 杰生自动技术有限公司 | Vehicle battery protection method having power supply noise signal mode analysis function and apparatus therefor |
| CN1956287A (en) * | 2005-10-25 | 2007-05-02 | 杰生自动技术有限公司 | Power control method of vehicle battery and its device |
| CN103118467A (en) * | 2013-02-18 | 2013-05-22 | 盐城工学院 | High-power LED constant current driving circuit and parameter algorithm thereof |
-
2014
- 2014-10-31 CN CN201410600659.0A patent/CN104333214A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100502720B1 (en) * | 2004-08-30 | 2005-07-20 | 노하우뱅크(주) | Power control device in an automobile |
| CN1808150A (en) * | 2005-01-18 | 2006-07-26 | 杰生自动技术有限公司 | Vehicle battery protection method having power supply noise signal mode analysis function and apparatus therefor |
| CN1956287A (en) * | 2005-10-25 | 2007-05-02 | 杰生自动技术有限公司 | Power control method of vehicle battery and its device |
| CN103118467A (en) * | 2013-02-18 | 2013-05-22 | 盐城工学院 | High-power LED constant current driving circuit and parameter algorithm thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109586394A (en) * | 2018-12-03 | 2019-04-05 | 陕西理工大学 | A kind of automobile data recorder power supply circuit |
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Application publication date: 20150204 |
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