CN207406430U - With overcurrent protection function ignition module circuit - Google Patents

Abstract

One kind has overcurrent protection function ignition module circuit,Ignition module input terminal passes through capacitance C1 connection comparator A1 in-phase input ends,Ignition module input terminal is also connected with diode D2 cathode,D2 anodes pass through resistance R1 connection comparator A1 output terminals,D2 anodes 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 cathode and resistance R2,D1 plus earths,The resistance R2 other ends are connected with power tube Q1 output terminals,Q1 input terminals are connected with comparator A1 output terminals,Q1 cathode are grounded,The cathode ground connection of comparator A1,The anode of comparator A1 and voltage-stabiliser tube D3 cathode,Capacitance C2 one end and resistance R5 one end connect simultaneously,The anode of D3 and the other end of capacitance C2 are grounded,Resistance R5 other ends connection anode IGN,Power tube Q1 output terminals are used to control ignition coil grade electric current.

Description

With overcurrent protection function ignition module circuit

Technical field

The utility model belongs to car engine electronic control technology field more particularly to overcurrent protection function igniting Modular circuit.

Background technology

Existing car engine electronic ignition module does not possess overcurrent protection function generally, when ignition coil primary short or When circuit reason causes ignition module internal power pipe overcurrent, 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, needs replacing the Coilpack with ignition module, cost is higher.According to tearing open The total vehicle of ignition coil for the damage examined can carry out technology analysis and draw, wherein ignition module damage accounts for more than 6 one-tenth.

Utility model content

The utility model is the saturation voltage drop of direct sampled point fire controlling transistor, when the saturation voltage drop overflows, is passed through The positive feedback pattern of circuit make " power D-flip flop " that prime small signal amplification circuit and power tube and feedback element form by Conducting state is drastically overturn as cut-off state, is rapidly protected power tube in time, is made ignition module relatively reliable.This practicality is new The technical solution of type is：

Provide it is a kind of there is overcurrent protection function ignition module circuit, be characterized in that including：

Comparator A1, power tube Q1, zener diode D1 and D3, diode D2, capacitance C1 and C2, resistance R1, R2, R3, R4 and R5, wherein,

Ignition module input terminal is by the in-phase input end of the capacitance C1 connections comparator A1, and ignition module input terminal is also Connect the cathode of the diode D2, the anode of the diode D2 is described by the A1 output terminals of resistance R1 connection comparators Also by the resistance R3 connections comparator A1 in-phase input ends, the comparator A1 in-phase input ends lead to the anode of diode D2 The resistance R4 ground connection is crossed, the inverting input of the comparator A1 connects simultaneously with the zener diode D1 cathode and resistance R2 It connects, the plus earth of the zener diode D1, the other end of the resistance R2 is connected with power tube Q1 output terminals, the power The input terminal of pipe Q1 is connected with the output terminal of comparator A1, the cathode ground connection of the power tube Q1, the cathode of the comparator A1 Ground connection, the cathode of the anode of the comparator A1 and the zener diode D3, described capacitance C2 one end and resistance R5 one end are same When connect, the anode of the zener diode D3 is grounded with the other end of capacitance C2, the other end of resistance R5 connection electricity Source anode IGN, the power tube Q1 output terminals are used to control ignition coil grade electric current.

Further, additionally provide it is a kind of there is overcurrent protection function ignition module circuit, be characterized in that including：

It is terminated in the igniting drive signal IGT inputs of the ignition module for the IGT signals to input into row buffering An input terminal of the comparator A2, the comparator A2 of amplification connect a reference voltage V ref, and the comparator A1's is another Input terminal is used to receive the igniting drive signal IGT of front stage circuits output, the comparator as new ignition module input terminal The cathode ground connection of A2, the anode of the comparator A2 are connected with the anode of the comparator A1.

The beneficial effects of the utility model are：Due to sampling electricity without the high current as needed for the sampling of prior art overcurrent Resistance, but the directly saturation voltage drop of sampled point fire controlling transistor, make prime low level signal amplification by the positive feedback pattern of circuit " the power D-flip flop " of circuit and power tube and feedback element composition is drastically overturn by conducting state as cut-off state, so right The protection of power tube is extremely rapid, and circuit structure design is ingenious, succinct, component is less, it is at low cost, be easy to scale amount Production, makes ignition module relatively reliable, is one of core control technology in engine electronic control system field of independent research, economy effect Benefit and social benefit are apparent.

Description of the drawings

Fig. 1 is that one kind that the utility model embodiment provides has overcurrent protection function ignition module circuit,

Fig. 2 is that the another kind that the utility model embodiment 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 connection relation.

Specific embodiment

The utility model is high current sampling resistor that need not be required as the sampling of prior art overcurrent, but direct sampled point The saturation voltage drop of fiery controlling transistor makes prime small signal amplification circuit and power tube and feedback by the positive feedback pattern of circuit " the power D-flip flop " of element composition is drastically overturn by conducting state as cut-off state, so extremely fast to the protection of power tube Speed is illustrated the utility model with reference to specific embodiment.

Embodiment 1

The utility model embodiment provides a kind of with overcurrent protection function ignition module circuit, basic structure bag Include, comparator A1, power tube Q1, zener diode D1 and D3, diode D2, capacitance C1 and C2, resistance R1, R2, R3, R4 and R5, wherein,

Ignition module input terminal is also connected with by the in-phase input end of capacitance C1 connection comparators A1, ignition module input terminal The cathode of diode D2, the anode of diode D2 is by the A1 output terminals of resistance R1 connection comparators, and the anode of diode D2 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 zener diode D1 cathode and resistance R2, the plus earth of zener diode D1, resistance R2's The other end is connected with power tube Q1 output terminals, and the input terminal of power tube Q1 is connected with the output terminal of comparator A1, power tube Q1's Cathode is grounded, the cathode ground connection of comparator A1, the anode of comparator A1 and the cathode of zener diode D3, capacitance C2 one end and electricity Resistance R5 one end connects simultaneously, and the anode of zener diode D3 is grounded with the other end of capacitance C2, the other end connection of resistance R5 Positive pole IGN, power tube Q1 output terminal are used to control ignition coil grade electric current.

The element in 1 illustrates operation principle below in conjunction with the accompanying drawings, which 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 since engine does not rotate, by engine electronic control unit The ignition control terminal IGT of output is low level, and by the clamping action of diode D2, terminal potential on resistance R6 is dragged down, should Low potential divides again through resistance R4, R5 makes the in-phase input end of comparator A2 for low potential, 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 is sensed according to the crankshaft position sensor of real-time working condition, CMPS Camshaft Position Sensor, air flow meter, water temperature The computing of the input signals such as device, intake air temperature sensor, throttle position sensor simultaneously exports igniting arteries and veins in ignition control terminal IGT Punching, when IGT signal leading edges (i.e. rising edge) arrives, which charges to capacitance C1, and rise saltus step voltage is coupled to Comparator A1 in-phase input ends, when setting circuit, it is ensured that the voltage stabilizing value of zener diode D1 is less than ignition control signal IGT's High level voltage value, actually zener 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 excessively 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 terminal is connected with a power supply anode, 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 arriving 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, drain potential is pulled low, by the feedback effect of resistance R2, Make the anti-phase input terminal potential of comparator A1 less than its homophase input terminal potential, i.e., comparator A1, power tube Q1 at this time 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 IGT rising edges are gone at this time, into the flat-top stage of the high level of ignition control pulse, electricity Hold that C1 is charged finishes, but at this time comparator A1 output terminals output high level made by resistance R1 and resistance R3, R4 partial pressure it is same Phase input terminal voltage locks in the stable state of power tube conducting certainly higher than anti-phase input terminal voltage at this time, the at this time 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 The clamper of pipe D2 makes comparator A1 in-phase input ends for 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.

The above are the ignition processes normally controlled.

3. when in the IGT high level stages, in the event of power tube overcurrent, such as since ignition coil or line anomalies are short When reasons cause power tube overcurrent, the drain potential of power tube Q1 will be above comparator A1 homophase input terminal potentials for road, electric leakage, Make comparator A1 overturning output low potentials, power tube Q1 ends immediately, and the power tube Q1 drain electrode output high potentials after cut-off pass through Feedback resistance R2 makes the anti-phase input terminal potential of comparator A1 be still higher than its homophase input terminal potential, and comparator A1 exports low electricity Position, i.e. " the power trigger device " lock in the stable state of power tube cut-off certainly, prevent short circuit current flow is excessive from endangering power tube. When next IGT pulse front edges arrive, the differential action of the voltage through capacitance 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 make it It overturns and self-locking is 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 extracted in foregoing " differential action ", due to the drain electrode of power tube Q1 Current potential remains above comparator A1 homophase input terminal potentials, " power trigger device " and can be flipped back to and lock in the steady of power tube cut-off certainly 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 unlock once, so power tube can intermittently occur, of short duration exploratory " conducting is narrow Pulse ", to be more than, power tube reliably opens the required grid departure time to the width of the burst pulse and the burst pulse time is suitable It is short, to prevent power tube short-circuit current rush from thermal damage occurred.If general recommendations burst pulse is measured with duty cycle estimation, with ＜ 1% is advisable.In experimental design, can by adjusting resistance R1 and resistance R3, R4 dividing ratios and capacitance C1 and resistance R3, The time constant of R4 adjusts " conducting burst pulse " width.

Ignition module overcurrent protection function response is sensitive, is swift in motion, this is because 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, sexual valence is higher.

Embodiment 2

The utility model has overcurrent protection function ignition module circuit embodiment further provides a kind of, as shown in Fig. 2, It is terminated with carrying out the IGT signals of input the ratio of Hyblid Buffer Amplifier in the igniting drive signal IGT inputs of foregoing ignition module Compared with device A2, an input terminal of comparator A2 connects a reference voltage V ref, and another input terminal of comparator A1 is as new point Fiery module input is used to receive the cathode ground connection of igniting the drive signal IGT, comparator A2 of front stage circuits output, comparator A2 Anode be connected with the anode of comparator A1.

The ignition control pulse IGT that the effect of comparator A2 mainly sends engine electronic control unit prime chip Carry out shaping and Hyblid Buffer Amplifier.

Assistant solves supplemented by addition, and the utility model embodiment also shows circuit shown in Fig. 2 and surrounding outward element The electrical block diagram of connection relation, as shown in Figure 3.In figure, IGSW is vehicle ignition switch, parallel bars while ignition coil The primary of IGNATION COIL is L1, the controlled contact of the anode of secondary L2, L1 connection main relay M-REL, main relay One termination IGN of coil, other end ground connection.The secondary L2 of ignition coil IGNATION COIL is used to simultaneously to upper stop to be a pair of The cylinder spark of point.

The embodiment of the utility model is merely to illustrate the technical solution of the utility model, is not the limit to the utility model System, by equivalent replacement and non-creative labour income to other embodiment or other combine obtained embodiments and each fall within Scope of protection of the utility model, the scope of protection of the utility model 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, zener diode D1 and D3, diode D2, capacitance C1 and C2, resistance R1, R2, R3, R4 and R5, wherein,

Input terminal with overcurrent protection function ignition module passes through the in-phase input end of the capacitance C1 connections comparator A1, point Fiery module input is also connected with the cathode of the diode D2, and the anode of the diode D2 passes through resistance R1 connection comparators A1 output terminals, the anode 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 zener diode D1 cathode It is connected simultaneously with resistance R2, the plus earth of the zener diode D1, the other end and the power tube Q1 of the resistance R2 are exported End connection, the input terminal of the power tube Q1 are connected with the output terminal of comparator A1, the cathode ground connection of the power tube Q1, described Cathode, described capacitance C2 one end of the cathode ground connection of comparator A1, the anode of the comparator A1 and the zener diode D3 And resistance R5 one end connects simultaneously, the anode of the zener diode D3 is grounded with the other end of capacitance C2, the resistance R5 Other end connection positive pole IGN, the power tube Q1 output terminals are for controlling ignition coil grade electric current.

2. according to claim 1 have overcurrent protection function ignition module circuit, it is characterised in that further includes:

It is terminated in the igniting drive signal IGT inputs with overcurrent protection function ignition module for the IGT to input The input terminal that signal carries out the comparator A2, the comparator A2 of Hyblid Buffer Amplifier connects a reference voltage V ref, the ratio Another input terminal compared with device A1 is used to receive the igniting drive signal of front stage circuits output as new ignition module input terminal The cathode ground connection of IGT, the comparator A2, the anode of the comparator A2 are connected with the anode of the comparator A1.