CN107676209A - With overcurrent protection function ignition module circuit - Google Patents
With overcurrent protection function ignition module circuit Download PDFInfo
- Publication number
- CN107676209A CN107676209A CN201711051132.7A CN201711051132A CN107676209A CN 107676209 A CN107676209 A CN 107676209A CN 201711051132 A CN201711051132 A CN 201711051132A CN 107676209 A CN107676209 A CN 107676209A
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- Prior art keywords
- comparator
- resistance
- input
- power tube
- voltage
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P3/00—Other installations
- F02P3/02—Other installations having inductive energy storage, e.g. arrangements of induction coils
- F02P3/04—Layout of circuits
- F02P3/055—Layout of circuits with protective means to prevent damage to the circuit, e.g. semiconductor devices or the ignition coil
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
One kind has overcurrent protection function ignition module circuit,Ignition module input passes through electric capacity C1 connection comparator A1 in-phase input ends,Ignition module input is also connected with diode D2 negative poles,D2 positive poles pass through resistance R1 connection comparator A1 output ends,D2 positive poles also pass through resistance R3 connection comparator A1 in-phase input ends,The in-phase input end is grounded by resistance R4,Comparator A1 inverting inputs are connected simultaneously with voltage-stabiliser tube D1 negative poles and resistance R2,D1 plus earths,The resistance R2 other ends are connected with power tube Q1 output ends,Q1 inputs are connected with comparator A1 output ends,Q1 negative poles are grounded,Comparator A1 negative pole ground connection,Comparator A1 positive pole and voltage-stabiliser tube D3 negative poles,Electric capacity C2 one end and resistance R5 one end connect simultaneously,The other end of D3 positive pole and electric capacity C2 is grounded,Resistance R5 other ends connection positive pole IGN,Power tube Q1 output ends are used to control ignition coil level electric current.
Description
Technical field
The invention belongs to car engine electronic control technology field, more particularly to there is overcurrent protection function ignition module
Circuit.
Background technology
Existing car engine electronic ignition module does not possess overcurrent protection function typically, when ignition coil primary short or
When circuit reason causes ignition module internal power pipe excessively stream, power tube easily damages.In modular circuit is lighted a fire in most imports,
And seldom possess power defencive function, and so in automobile maintenance industry, ignition coil and ignition module damage are frequently found, it is special
It is not that the single cylinder without ignition distributor is independently lighted a fire or the twin-tub ignition coil of ignition system and ignition module one simultaneously now
Body, if ignition module damages, need to change the Coilpack with ignition module, its cost is higher.According to tearing open
The total car of ignition coil for the damage examined can carry out technical Analysis and draw, wherein ignition module damage accounts for more than 6 one-tenth.
The content of the invention
The present invention is the saturation voltage drop of direct sampled point fire controlling transistor, when the saturation voltage drop overflows, passes through circuit
Positive feedback pattern make " power D-flip flop " that prime small signal amplification circuit and power tube and feedback element form by turning on
State is drastically overturn as cut-off state, is rapidly protected power tube in time, is made ignition module relatively reliable.The technology of the present invention
Scheme is：
Provide it is a kind of there is overcurrent protection function ignition module circuit, its be characterized in that including：
Comparator A1, power tube Q1, voltage-regulator diode D1 and D3, diode D2, electric capacity C1 and C2, resistance R1, R2, R3,
R4 and R5, wherein,
Ignition module input is by electric capacity C1 connections comparator A1 in-phase input end, and ignition module input is also
Connect the negative pole of the diode D2, the positive pole of the diode D2 is described by the A1 output ends of resistance R1 connection comparators
Diode D2 positive pole is also led to by the resistance R3 connections comparator A1 in-phase input ends, the comparator A1 in-phase input ends
The resistance R4 ground connection is crossed, the inverting input of the comparator A1 connects simultaneously with the voltage-regulator diode D1 negative poles and resistance R2
Connect, the plus earth of the voltage-regulator diode D1, the other end of the resistance R2 is connected with power tube Q1 output ends, the power
Pipe Q1 input is connected with comparator A1 output end, the negative pole ground connection of the power tube Q1, the negative pole of the comparator A1
Ground connection, the positive pole of the comparator A1 and voltage-regulator diode D3 negative pole, described electric capacity C2 one end and resistance R5 one end are same
When connect, the positive pole of the voltage-regulator diode D3 is grounded with the electric capacity C2 other end, the other end of resistance R5 connection electricity
Source positive pole IGN, the power tube Q1 output ends are used to control ignition coil level electric current.
Further, additionally provide it is a kind of there is overcurrent protection function ignition module circuit, its be characterized in that including：
It is terminated with the igniting drive signal IGT inputs of the ignition module for entering row buffering to the IGT signals of input
The comparator A2, the comparator A2 of amplification an input connect a reference voltage V ref, and the comparator A1's is another
Input is used for the igniting drive signal IGT for receiving front stage circuits output, the comparator as new ignition module input
A2 negative pole ground connection, the positive pole of the comparator A2 are connected with the positive pole of the comparator A1.
The beneficial effects of the invention are as follows：Due to high current sampling resistor that need not be required as the sampling of prior art excessively stream, and
The saturation voltage drop of direct sampled point fire controlling transistor, by the positive feedback pattern of circuit make prime small signal amplification circuit and
" the power D-flip flop " of power tube and feedback element composition is drastically overturn by conducting state as cut-off state, so to power tube
Protection it is extremely rapid, and circuit structure design is ingenious, succinct, component is less, cost is low, is easy to scale volume production, makes
Ignition module is relatively reliable, is one of core control technology in engine electronic control system field of independent research, economic benefit and
Social benefit is obvious.
Brief description of the drawings
Fig. 1 is that one kind that embodiment of the present invention provides has overcurrent protection function ignition module circuit,
Fig. 2 is that the another kind that embodiment of the present invention provides has overcurrent protection function ignition module circuit,
Fig. 3 is the electrical block diagram of circuit shown in Fig. 2 and surrounding outward element annexation.
Embodiment
The present invention is high current sampling resistor that need not be required as the sampling of prior art excessively stream, but directly sampled point fire control
The saturation voltage drop of transistor processed, prime small signal amplification circuit and power tube and feedback element are made by the positive feedback pattern of circuit
" the power D-flip flop " of composition is drastically overturn by conducting state as cut-off state, so the protection to power tube is extremely rapid,
The present invention is illustrated with reference to specific embodiment.
Embodiment 1
Embodiment of the present invention, which provides one kind, has overcurrent protection function ignition module circuit, and its basic structure includes,
Comparator A1, power tube Q1, voltage-regulator diode D1 and D3, diode D2, electric capacity C1 and C2, resistance R1, R2, R3, R4 and R5, its
In,
Ignition module input is also connected with by electric capacity C1 connection comparators A1 in-phase input end, ignition module input
Diode D2 negative pole, diode D2 positive pole is by the A1 output ends of resistance R1 connection comparators, and diode D2 positive pole is also
By resistance R3 connection comparator A1 in-phase input ends, comparator A1 in-phase input ends are grounded by resistance R4, comparator A1's
Inverting input is connected simultaneously with voltage-regulator diode D1 negative poles and resistance R2, voltage-regulator diode D1 plus earth, resistance R2's
The other end is connected with power tube Q1 output ends, and power tube Q1 input is connected with comparator A1 output end, power tube Q1's
Negative pole is grounded, comparator A1 negative pole ground connection, comparator A1 positive pole and voltage-regulator diode D3 negative pole, electric capacity C2 one end and electricity
Resistance R5 one end is connected simultaneously, and voltage-regulator diode D3 positive pole is grounded with the electric capacity C2 other end, resistance R5 other end connection
Positive source IGN, power tube Q1 output end are used to control ignition coil level electric current.
The element in 1 illustrates operation principle below in conjunction with the accompanying drawings, and the adjuster course of work is：
1. ignition switch IGN is in (ON) state of connection, but engine does not rotate, i.e. KOEO (key on engine
Off) state：IGN terminals are vehicle battery supply voltage, but because engine does not rotate, by engine electronic control unit
The IGNITION CONTROL terminal IGT of output is low level, and by diode D2 clamping action, terminal potential on resistance R6 is dragged down, should
Through resistance R4, R5, partial pressure makes comparator A2 in-phase input end be low potential to low potential again, therefore comparator A2 also exports low electricity
Position, power tube Q1 cut-offs.
2. when IGN is in ON states, engine operating, i.e. KOER (key on engine run) state：By engine
Electronic control unit senses according to the crankshaft position sensor of real-time working condition, CMPS Camshaft Position Sensor, mass air flow sensor, water temperature
The computing of the input signal such as device, intake air temperature sensor, TPS simultaneously exports igniting arteries and veins in IGNITION CONTROL terminal IGT
Punching, when IGT signal leading edges (i.e. rising edge) arrives, the leaping voltage is charged to electric capacity C1, and rise saltus step voltage is coupled to
Comparator A1 in-phase input ends, when setting circuit, it is ensured that voltage-regulator diode D1 voltage stabilizing value is less than ignition control signal IGT's
High level voltage value, actually voltage-regulator diode D1 are to carry out amplitude limit to the high potential of comparator A1 inverting inputs, first really
The high level that clamp value is less than comparator output is protected, second prevents the too high damage ratio of back-pressure number of pulses of power tube drain electrode output
Compared with device A1.It should be noted that general comparator output terminal is open-collector gate (OC), it is therefore desirable to which pull-up resistor will compare
Device output end is connected with a power supply positive pole, in view of the reason for this point belongs to known technology, is not shown in the pull-up resistor figure,
For the model of comparator chip intension pull-up resistor, then this point need not be repeated
So when being arrived in IGT forward positions, comparator A1 in-phase input ends are higher than inverting input, make comparator A1 outputs high
Current potential, power tube Q1 conductings, after power tube Q1 normallies, its drain potential is pulled low, by resistance R2 feedback effect,
Comparator A1 anti-phase input terminal potential is set to be less than its homophase input terminal potential, i.e., comparator A1, power tube Q1 now and anti-
Positive feedback network is formed between feed resistance R2, one is formed using comparator A1, power tube Q1 and feedback resistance R2 this three as core
Kind " power D-flip flop ", even if now IGT rising edges are gone over, into the flat-top stage of the high level of IGNITION CONTROL pulse, electricity
Hold that C1 is charged finishes, but now comparator A1 output ends output high level is made together by resistance R1 and resistance R3, R4 partial pressure
Phase input terminal voltage locks in the stable state of power tube conducting certainly higher than anti-phase input terminal voltage now, the now trigger,
This stage is used to magnetize for ignition coil magnetic core.
When engine electronic control unit output firing pulse IGT signal trailing edges (i.e. trailing edge) arrive, by two poles
Pipe D2 clamper makes comparator A1 in-phase input ends be low potential, and comparator A1 exports low potential, power tube Q2 cut-offs, igniting
Wound core releases energy, and coil secondary induction high pressure is that respective cylinder is lighted a fire.
Above is the ignition process normally controlled.
3. when in the IGT high level stages, in the event of power tube excessively stream, such as because ignition coil or circuit are extremely short
When the reasons such as road, electric leakage cause power tube excessively stream, power tube Q1 drain potential will be above comparator A1 homophase input terminal potentials,
Make comparator A1 upset output low potentials, power tube Q1 ends immediately, the power tube Q1 drain electrode output high potentials after cut-off, passes through
Feedback resistance R2 makes comparator A1 anti-phase input terminal potential be still higher than its homophase input terminal potential, and comparator A1 exports low electricity
Position, i.e. described " power trigger device " lock in the stable state of power tube cut-off certainly, prevent short circuit current is excessive from endangering power tube.
When next IGT pulse front edges arrive, the differential action of the voltage through electric capacity C1 and resistance R3, R4 of rise saltus step, by height
Level burst pulse extracts, and triggering " power trigger device " unlocks the stable state for locking in power tube cut-off certainly, it is intended to makes it
Overturn and self-locking be the stable state of power tube conducting, if short circuit releases, stablize the stable state that ingoing power pipe turns on,
If still short-circuit, after the high level burst pulse that foregoing " differential action " extracts, due to power tube Q1 drain electrode
Current potential remains above comparator A1 homophase input terminal potentials, and " power trigger device " can be flipped back to and lock in the steady of power tube cut-off certainly again
Determine state, power tube is continued to protect, in sequential short circuit, each IGT pulse front edge arrives, and locks in power tube certainly and cuts
Only " the power trigger device " of stable state by of short duration unblock once, so power tube can intermittently occur, of short duration exploratory " conducting is narrow
Pulse ", the width of the burst pulse is reliably to open the required grid departure time more than power tube and the burst pulse time is suitable
It is short, to prevent that it is impaired that power tube short-circuit current rush from occurring overheat.If general recommendations burst pulse is measured with dutycycle estimation, with
＜ 1% is advisable.In experimental design, can by adjust resistance R1 and resistance R3, R4 dividing ratios and electric capacity C1 and resistance R3,
R4 time constant adjusts " conducting burst pulse " width.
Ignition module overcurrent protection function response is sensitive, be swift in motion, this is due to direct sampled power pipe saturation pressure
The over-current protection method of drop makes overcurrent protection function more reliable and more stable, and circuit structure is simple, cost is relatively low, area occupied is small,
It is particularly suitable for manufacturing the ignition module thick film chip of high reliability small size, cost performance is higher.
Embodiment 2
Embodiment of the present invention, which additionally provides one kind, has overcurrent protection function ignition module circuit, as shown in Fig. 2 preceding
The igniting drive signal IGT for stating ignition module inputs the comparator being terminated with for carrying out Hyblid Buffer Amplifier to the IGT signals of input
A2, comparator A2 an input connect a reference voltage V ref, and comparator A1 another input is as new igniting mould
Block input is used for the negative pole ground connection for receiving igniting the drive signal IGT, comparator A2 of front stage circuits output, and comparator A2 is just
Pole is connected with comparator A1 positive pole.
The IGNITION CONTROL pulse IGT that comparator A2 effect is mainly sent to engine electronic control unit prime chip
Carry out shaping and Hyblid Buffer Amplifier.
Assistant solves supplemented by addition, and embodiment of the present invention also show circuit shown in Fig. 2 and is connected with surrounding outward element
The electrical block diagram of relation, as shown in Figure 3.In figure, IGSW is vehicle ignition switch, parallel bars while ignition coil
IGNATION COIL primary is L1, secondary L2, L1 positive pole connection main relay M-REL controlled contact, main relay
One termination IGN of coil, other end ground connection.Ignition coil IGNATION COIL secondary L2 is used to simultaneously to upper stop for a pair
The cylinder spark of point.
Embodiments of the invention are merely to illustrate technical scheme, are not limitations of the present invention, by equivalent
Replacement and non-creativeness labour income to other embodiment or other combination obtained by embodiment each fall within protection of the present invention
Scope, protection scope of the present invention are defined by the claims.
Claims (2)
1. one kind has overcurrent protection function ignition module circuit, it is characterised in that including:
Comparator A1, power tube Q1, voltage-regulator diode D1 and D3, diode D2, electric capacity C1 and C2, resistance R1, R2, R3, R4 and
R5, wherein,
Input with overcurrent protection function ignition module passes through electric capacity C1 connections comparator A1 in-phase input end, point
Fiery module input is also connected with the negative pole of the diode D2, and the positive pole of the diode D2 passes through resistance R1 connection comparators
A1 output ends, the positive pole of the diode D2 also pass through the resistance R3 connections comparator A1 in-phase input ends, the comparator
A1 in-phase input ends are grounded by the resistance R4, the inverting input of the comparator A1 and the voltage-regulator diode D1 negative poles
Connected simultaneously with resistance R2, the plus earth of the voltage-regulator diode D1, the other end and the power tube Q1 of the resistance R2 are exported
End connection, the input of the power tube Q1 are connected with comparator A1 output end, the negative pole ground connection of the power tube Q1, described
Comparator A1 negative pole ground connection, the positive pole of the comparator A1 and the voltage-regulator diode D3 negative pole, described electric capacity C2 one end
And resistance R5 one end connects simultaneously, the positive pole of the voltage-regulator diode D3 is grounded with the electric capacity C2 other end, the resistance R5
The other end connection positive source IGN, the power tube Q1 output ends be used for control ignition coil level electric current.
2. according to claim 1 have overcurrent protection function ignition module circuit, it is characterised in that also includes:
It is terminated with the igniting drive signal IGT inputs with overcurrent protection function ignition module for the IGT to input
The input that signal carries out the comparator A2, the comparator A2 of Hyblid Buffer Amplifier connects a reference voltage V ref, the ratio
Another input compared with device A1 is used for the igniting drive signal for receiving front stage circuits output as new ignition module input
IGT, the comparator A2 negative pole ground connection, the positive pole of the comparator A2 are connected with the positive pole of the comparator A1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711051132.7A CN107676209A (en) | 2017-11-01 | 2017-11-01 | With overcurrent protection function ignition module circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711051132.7A CN107676209A (en) | 2017-11-01 | 2017-11-01 | With overcurrent protection function ignition module circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107676209A true CN107676209A (en) | 2018-02-09 |
Family
ID=61143308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711051132.7A Withdrawn CN107676209A (en) | 2017-11-01 | 2017-11-01 | With overcurrent protection function ignition module circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107676209A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111190404A (en) * | 2018-11-15 | 2020-05-22 | 联合汽车电子有限公司 | Control system, internal drive ignition system and ignition circuit fault diagnosis method |
-
2017
- 2017-11-01 CN CN201711051132.7A patent/CN107676209A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111190404A (en) * | 2018-11-15 | 2020-05-22 | 联合汽车电子有限公司 | Control system, internal drive ignition system and ignition circuit fault diagnosis method |
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Application publication date: 20180209 |
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| WW01 | Invention patent application withdrawn after publication |