Passive ignition module with temperature protection function
By separating the Darlington transistor and the temperature protection module in the automotive engine ignition module, and using a temperature sampling and temperature control execution unit to monitor and shut down the Darlington transistor, the problem of temperature protection in the ignition module is solved, achieving a stable, reliable, and cost-effective temperature protection effect.
Patent Information
- Application Number
- CN202520102617.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-15
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2035-01-15
AI Technical Summary
Existing automotive engine ignition modules lack temperature protection functions, which makes Darlington tubes prone to damage under abnormal operating conditions, leading to vehicle malfunctions. Furthermore, existing temperature protection modules are technically challenging, have low yield rates, and are costly, hindering their widespread adoption.
The Darlington tube and temperature protection module are set up separately. The temperature of the Darlington tube is monitored by the temperature sampling unit and the temperature control execution unit, and it is forced to shut down at high temperature to avoid damage. The separate solution is adopted to reduce costs.
It achieves cost reduction while ensuring stability and reliability, prevents Darlington tube overheating and damage, avoids vehicle malfunctions, and is suitable for large-scale promotion.
Smart Images
Figure CN223523867U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of automobile engine electronic ignition control technology especially relates to a passive ignition module with temperature protection function. BACKGROUND
[0002] In the field of automobile engine electronic ignition control, ECU refers to engine electronic control unit, ECU signal refers to the EST control signal output by ECU, and the ignition module of the automobile engine control system controls the ignition coil according to the ECU signal. When the ECU signal is high level, the primary winding of the ignition coil is turned on, and the primary current increases with the on time. When the ECU signal is low level, the primary current of the ignition coil is turned off, and the secondary winding of the ignition coil generates a high voltage to complete the ignition function.
[0003] The ignition coil is generally divided into IGBT type and Darlington tube type according to the different power devices of the ignition module. The ignition coil will continue to heat and rise in temperature during work. The fastest part of the Darlington tube type ignition coil to rise in temperature is the power device Darlington tube on the internal ignition module. The Darlington tube itself has a certain temperature bearing range (usually -55 DEG C to +175 DEG C). When the temperature exceeds this range, the Darlington tube will be irreversibly damaged by heat, and in severe cases, it will short circuit and cause other vehicle failures.
[0004] At present, most of the ignition modules on the market do not have temperature protection function. After the ignition module receives the ECU signal of the automobile, it will completely control the ignition coil according to the ECU signal, without paying attention to the temperature condition of IGBT or Darlington tube. When the ECU signal is abnormal or the working condition is harsh, IGBT or Darlington tube will seriously heat, which is easy to cause IGBT or Darlington tube thermal damage, and even burn ECU. However, only a few ignition modules on the market have temperature protection function, but they integrate the temperature protection function on IGBT or Darlington tube, which has great technical difficulty, low yield, high packaging cost, and is not conducive to large-scale promotion. UTILITY MODEL CONTENTS
[0005] The utility model aims at providing a passive ignition module with temperature protection function, which adopts a separate scheme for the Darlington tube and the temperature protection module, has cost advantage while ensuring stability and reliability, and is conducive to promotion. When the temperature of the Darlington tube is lower than the temperature protection threshold, the ignition control unit can completely control the Darlington tube according to the connected ECU signal. When the temperature of the Darlington tube is equal to or higher than the temperature protection threshold, the temperature protection module will control the Darlington tube to be unable to conduct.
[0006] To achieve the above purpose, the following technical scheme is adopted:
[0007] The application discloses a passive ignition module with temperature protection function, which comprises an ignition control unit, a Darlington tube connected to the output end of the ignition control unit, and a temperature protection module with one end connected to the base of the Darlington tube; the Darlington tube is connected to an ignition coil; the ignition control unit is used for controlling the Darlington tube to be turned on or turned off according to an ECU signal, so as to realize the ignition function of the ignition coil; the other end of the temperature protection module is connected to the input end of the ECU signal; the Darlington tube and the temperature protection module are separately arranged; wherein:
[0008] The temperature protection module comprises a temperature control execution unit and a temperature sampling unit connected to the input end of the temperature control execution unit; the temperature sampling unit is used for sampling the temperature of the Darlington tube and inputting the sampling result signal to the temperature control execution unit;
[0009] When the temperature sampling unit samples the temperature of the Darlington tube and finds that the temperature is lower than a temperature protection threshold value, the temperature control execution unit does not control the Darlington tube to work; when the temperature sampling unit samples the temperature of the Darlington tube and finds that the temperature is equal to or higher than the temperature protection threshold value, the temperature control execution unit is used for forcibly pulling down the signal of the base of the Darlington tube, so that the Darlington tube cannot be turned on.
[0010] Preferably, the temperature sampling unit comprises a second Schottky diode, a sixth resistor and a seventh resistor; the cathode of the second Schottky diode is connected to the input end of the ECU signal; the anode of the second Schottky diode is connected to the ground in sequence after being connected to the sixth resistor and the seventh resistor; the input end of the temperature control execution unit is connected between the sixth resistor and the seventh resistor.
[0011] Preferably, the temperature control execution unit comprises a second triode, an eighth resistor and a ninth resistor; the first end of the eighth resistor is connected between the sixth resistor and the seventh resistor, and the second end of the eighth resistor is connected to the base of the second triode; the first end of the ninth resistor is connected to the emitter of the second triode, and the second end of the ninth resistor is connected to the ground.
[0012] Preferably, a first resistor is further arranged between the input end of the ECU signal and the ignition control unit; the first end of the first resistor is connected to the input end of the ECU signal; the second end of the first resistor is respectively connected to the ignition control unit and the cathode of the second Schottky diode.
[0013] Preferably, the ignition control unit comprises a three-terminal adjustable shunt reference source, a third resistor, a fourth resistor and a fifth resistor; the anode of the three-terminal adjustable shunt reference source is connected to the ground, and the cathode is connected to the base of the Darlington tube; the reference end of the three-terminal adjustable shunt reference source is respectively connected to the first end of the third resistor and the first end of the fourth resistor; the second end of the third resistor is connected to the base of the Darlington tube; the second end of the fourth resistor and the first end of the fifth resistor are respectively connected to the emitter of the Darlington tube; and the second end of the fifth resistor is connected to the ground.
[0014] With the above scheme, the beneficial effects of the utility model are:
[0015] The utility model provides a passive ignition module with temperature protection function, its darlington tube and temperature protection module adopt discrete scheme, guarantee stable and reliable when having cost advantage, be conducive to the promotion. When the temperature of darlington tube is lower than temperature protection threshold value, ignition control unit can be in accordance with the ECU signal of access control darlington tube work completely, when the temperature of darlington tube is equal to or higher than temperature protection threshold value, temperature protection module will control darlington tube and cannot be conducted, close ignition coil, the control of ignition control unit does not work at this time, until the temperature of darlington tube falls to the safety range, and ignition control unit will restore the control work of darlington tube, to prevent ignition module heat damage and the various vehicle failures caused thereby. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 It is the principle diagram of the utility model;
[0017] Figure 2 It is the circuit diagram of the utility model;
[0018] Figure 3 It is the position relation diagram of the darlington tube and second schottky diode of the utility model;
[0019] Figure 4 It is the temperature characteristic diagram of the second schottky diode of the utility model;
[0020] Figure 5 It is the curve model diagram of the temperature of the second schottky diode and its distance relation with darlington tube of the utility model;
[0021] Among them, the figure mark explanation is:
[0022] 1 - ignition control unit, 2 - darlington tube,
[0023] 3 - temperature protection module, 4 - ignition coil,
[0024] 5 - PCB board, 31 - temperature control execution unit,
[0025] 32 - temperature sampling unit, 33 - second schottky diode. DETAILED DESCRIPTION
[0026] The utility model will be further explained in detail in the following with the figures and examples. It can be understood that the specific examples described here are only for explaining the utility model, and not for limiting the utility model. In addition, it needs to be explained that, for the convenience of description, only the part related to the utility model is shown in the drawing, not all structures.
[0027] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can include direct contact between the first and second features, or indirect contact between the first and second features through another feature therebetween. Moreover, the first feature "on", "above" and "on" the second feature includes the first feature directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature "under", "below" and "below" the second feature includes the first feature directly below and obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.
[0028] In the description of the present application, the terms "up", "down", "left", "right" and other orientation or position relationships are based on the orientation or position relationship shown in the drawings, which is only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in description and have no special meaning.
[0029] Referring to Figures 1 to 5 The utility model provides a passive ignition module with temperature protection function, including ignition control unit 1, connect in the output end of ignition control unit 1 darlington tube 2 and the temperature protection module 3 of one end connection in darlington tube 2 base, darlington tube 2 is connected with ignition coil 4, and darlington tube Q1 2 is used for the switch control of ignition coil 4 primary winding, ignition control unit 1 is used for according to ECU signal control darlington tube 2 conduction or close, to realize the ignition function of ignition coil 4, the other end of temperature protection module 3 is connected to ECU signal input end, darlington tube 2 and temperature protection module 3 are separately arranged, wherein:
[0030] Temperature protection module 3 includes temperature control execution unit 31 and temperature sampling unit 32 connected to the input end of temperature control execution unit 31, temperature sampling unit 32 is used for sampling the temperature of darlington tube 2 and inputting the sampling result signal to temperature control execution unit 31,
[0031] When temperature sampling unit 32 samples the temperature of darlington tube 2 and is lower than temperature protection threshold, temperature control execution unit 31 does not control darlington tube 2 to work, when temperature sampling unit 32 samples the temperature of darlington tube 2 and is equal to or higher than temperature protection threshold, temperature control execution unit 31 is used for compulsorily pulling down the signal of darlington tube 2 base, so that darlington tube 2 cannot be conducted.
[0032] The passive ignition module with the temperature protection function can achieve the following purposes.
[0033] 1) When the temperature of the Darlington tube 2 is lower than the temperature protection threshold, the ignition control unit 1 can completely control the Darlington tube 2 to work according to the ECU signal;
[0034] 2) When the temperature of the Darlington tube 2 is equal to or higher than the temperature protection threshold, the temperature protection module 3 will forcibly control the Darlington tube 2 to be unable to conduct, and the ignition coil 4 is turned off, at this time, the ignition control unit 1 does not work, until the temperature of the Darlington tube 2 is reduced to the safe range, and then the ignition control unit 1 will restore the control work on the Darlington tube 2;
[0035] 3) The Darlington tube 2 and the temperature protection module 3 adopt a discrete scheme, which has the advantages of stability, reliability and cost, and is conducive to popularization.
[0036] Please continue to refer to Figure 2 , the IN end accesses the ECU signal, the ECU signal is a 5V square wave signal output by the ECU, the GND is the ground, and the C- ignites the primary winding of the ignition coil 4.
[0037] The temperature sampling unit 32 includes a second Schottky diode D2 33, a sixth resistor R6 and a seventh resistor R7. The cathode of the second Schottky diode D2 33 is connected to the ECU signal input end. In the temperature protection module 3, the circuit does not need a power supply, and the cathode of the second Schottky diode D2 33 is connected to the ECU signal input end, and the voltage division signal is taken to control the second triode Q2 to work. The anode of the second Schottky diode D2 33 is connected to the ground in sequence after being connected to the sixth resistor R6 and the seventh resistor R7. The input end of the temperature control execution unit 31 is connected between the sixth resistor R6 and the seventh resistor R7.
[0038] The temperature control execution unit 31 includes a second triode Q2, an eighth resistor R8 and a ninth resistor R9. The first end of the eighth resistor R8 is connected between the sixth resistor R6 and the seventh resistor R7, and the second end of the eighth resistor R8 is connected to the base of the second triode Q2. The eighth resistor R8 is a port protection resistor, and the signal is input to the base of the second triode Q2 through the eighth resistor R8 to control the switch of the second triode Q2. When the second triode Q2 is turned off, the input signal of the base of the Darlington tube Q1 2 is not affected. When the second triode Q2 is turned on, the input signal of the base of the Darlington tube Q1 2 is forcibly pulled down, so that the Darlington tube Q1 2 is in the closed state, and the ignition module cannot work. The first end of the ninth resistor R9 is connected to the emitter of the second triode Q2, and the second end of the ninth resistor R9 is connected to the ground. The ninth resistor R9 is a protection resistor for the emitter of the second triode Q2.
[0039] The first resistor R1 is a signal end surge protection resistor, and protects the second Schottky diode D2 33 and a circuit of the subsequent ignition control unit 1.
[0040] The ignition control unit 1 comprises a three-terminal adjustable shunt reference source D1, a third resistor R3, a fourth resistor R4 and a fifth resistor R5; the anode of the three-terminal adjustable shunt reference source D1 is grounded, and the cathode is connected to the base of the Darlington tube Q1 2; the reference end of the three-terminal adjustable shunt reference source D1 is connected to the first end of the third resistor R3 and the first end of the fourth resistor R4; the second end of the third resistor R3 is connected to the base of the Darlington tube Q1 2; the second end of the fourth resistor R4 and the first end of the fifth resistor R5 are respectively connected to the emitter of the Darlington tube Q1 2; and the second end of the fifth resistor R5 is grounded.
[0041] In addition, the ignition control unit 1 further comprises a second resistor R2 and a first capacitor C1; the second resistor R2 is a signal end surge protection resistor, and cooperates with the first resistor R1 to protect the base port of the Darlington tube 2; the first capacitor C1 is an input signal filtering capacitor; the fifth resistor R5 is a milliohm sampling resistor, the third resistor R3 and the fourth resistor R4 are voltage dividing resistors, and the three-terminal adjustable shunt reference source D1, the third resistor R3, the fourth resistor R4 and the fifth resistor R5 cooperate to set the primary current limiting function of the ignition module.
[0042] In an embodiment, the control logic of the passive ignition module with the temperature protection function comprises:
[0043] 1) the temperature protection threshold is 160 DEG C (in the range of -55 DEG C to +175 DEG C), and it is defined that when the temperature of the Darlington Q1 2 is equal to or higher than 160 DEG C, the over-temperature protection function is triggered, the signal at the base of the Darlington tube Q1 2 is forced to be pulled down, so that the Darlington tube Q1 2 cannot be turned on, and the ignition coil 4 cannot work;
[0044] 2) the over-temperature protection function cannot affect the normal ignition function; when the temperature of the Darlington tube Q1 2 is lower than the temperature protection threshold, the ignition control unit 1 can completely control the turn-on and turn-off of the Darlington tube Q1 2 according to the ECU signal connected;
[0045] 3) after the over-temperature protection function is triggered, the ignition control unit 1 will restore the control of the Darlington tube Q1 2 and restore the normal ignition function when the temperature of the Darlington tube Q1 2 is lowered to a safe range (the temperature of the safe range is generally lower than 160 DEG C).
[0046] In another specific embodiment, the temperature sampling unit 32 selects a specific model of Schottky diode, please continue to refer to Figure 4 , the temperature characteristics of the second Schottky diode D2 33: when the ambient temperature is lower than 125℃, the reverse breakdown voltage of the second Schottky diode D2 33 is 100V; when the ambient temperature is higher than 125℃, the reverse breakdown voltage of the second Schottky diode D2 33 will drop to 0V.
[0047] Since the temperature protection module 3 is independent of the Darlington tube Q1 2, it cannot directly detect the temperature of the Darlington tube Q1 2, the second Schottky diode D2 33 in the temperature sampling unit 32 acts as a temperature measuring device, and the second Schottky diode D2 33 is arranged on the PCB board 5 at a certain distance from the Darlington tube 2. In a simulated application environment, the ignition module is encapsulated in epoxy resin, and through the heat transfer of the epoxy resin and the PCB board 5, the function of monitoring the temperature of the Darlington tube 2 through the Schottky diode D2 33 is realized. Perform temperature model analysis, and at the same time, combine the actual measurement data of the second Schottky diode D2 33 at different positions on the PCB board 5, when the temperature of the Darlington tube Q1 2 is 160℃, the temperature of the second Schottky diode D2 33 and the curve model of the distance relationship between it and the Darlington tube Q1 2 are obtained, as shown in Figure 5 . Finally, the second Schottky diode D2 33 is placed at a proper position on the PCB board 5, so that when the temperature of the Darlington tube Q1 2 is 160℃, the temperature of the second Schottky diode D2 33 is exactly around 125℃.
[0048] When the temperature of the Darlington tube Q1 2 is lower than 160℃, the temperature of the second Schottky diode D2 33 is lower than 125℃, and the reverse breakdown voltage of the second Schottky diode D2 33 is 100V. At this time, the second Schottky diode D2 33 cannot be reversely turned on, the base of the second triode Q2 is low, the second triode Q2 is turned off, and the signal of the base of the Darlington tube Q1 2 is not affected, that is, the temperature protection module 3 does not work at this time.
[0049] When the temperature of the Darlington tube Q1 2 is equal to or higher than 160℃, the temperature of the second Schottky diode D2 33 is equal to or higher than 125℃, and the reverse breakdown voltage of the second Schottky diode D2 33 is 0V. At this time, the second Schottky diode D2 33 is reversely turned on, the base voltage reaches the condition of the second triode Q2 being turned on through the voltage division of the sixth resistor R6 and the seventh resistor R7, the second triode Q2 is turned on, and the signal of the base of the Darlington tube Q1 2 is forced to be pulled low. At this time, the Darlington tube Q1 2 cannot be turned on, and the ignition coil 4 is always in an inoperative state.
[0050] When the temperature of the Darlington transistor Q1 2 drops, the temperature of the second Schottky diode D2 33 also drops, and the reverse breakdown voltage of the second Schottky diode D2 33 again becomes 100 V, and the ignition module resumes control of the ignition coil 4.
[0051] The above are only preferred embodiments of the present application, and are not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. Apparently, the above embodiments of the present application are only for clear illustration of the present application, and are not a limitation on the implementation manner of the present application. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the present application. Here, it is unnecessary and impossible to enumerate all the implementation manners. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application claims.
Claims
1. A passive ignition module having a temperature protection function, characterized by, The application relates to an ignition control unit, a Darlington tube connected to the output end of the ignition control unit, and a temperature protection module with one end connected to the base of the Darlington tube; the Darlington tube is connected with an ignition coil; the ignition control unit is used for controlling the Darlington tube to be turned on or turned off according to an ECU signal so as to realize the ignition function of the ignition coil; the other end of the temperature protection module is connected to an ECU signal input end; the Darlington tube and the temperature protection module are separately arranged; wherein: The temperature protection module comprises a temperature control execution unit and a temperature sampling unit connected to the input end of the temperature control execution unit; the temperature sampling unit is used for sampling the temperature of the Darlington tube and inputting the sampling result signal to the temperature control execution unit; When the temperature sampling unit samples the temperature of the Darlington tube to be lower than a temperature protection threshold value, the temperature control execution unit does not control the Darlington tube to work; when the temperature sampling unit samples the temperature of the Darlington tube to be equal to or higher than the temperature protection threshold value, the temperature control execution unit is used for forcibly pulling down the signal of the base of the Darlington tube so that the Darlington tube cannot be turned on.
2. The passive ignition module with temperature protection function according to claim 1, characterized in that, The temperature sampling unit comprises a second Schottky diode, a sixth resistor and a seventh resistor; the cathode of the second Schottky diode is connected to the ECU signal input end; the anode of the second Schottky diode is connected to the sixth resistor and the seventh resistor in sequence and then grounded; the input end of the temperature control execution unit is connected between the sixth resistor and the seventh resistor.
3. The passive ignition module with temperature protection function according to claim 2, characterized in that, The temperature control execution unit comprises a second triode, an eighth resistor and a ninth resistor; the first end of the eighth resistor is connected between the sixth resistor and the seventh resistor, and the second end of the eighth resistor is connected with the base of the second triode; the first end of the ninth resistor is connected with the emitter of the second triode, and the second end of the ninth resistor is grounded.
4. The passive ignition module with temperature protection function according to claim 2, characterized in that, A first resistor is further arranged between the ECU signal input end and the ignition control unit; the first end of the first resistor is connected with the ECU signal input end; the second end of the first resistor is respectively connected with the ignition control unit and the cathode of the second Schottky diode.
5. The passive ignition module with temperature protection function according to claim 1, wherein, The ignition control unit comprises a three-terminal adjustable shunt reference source, a third resistor, a fourth resistor and a fifth resistor; the anode of the three-terminal adjustable shunt reference source is grounded, and the cathode is connected to the base of the Darlington tube; the reference end of the three-terminal adjustable shunt reference source is respectively connected with the first end of the third resistor and the first end of the fourth resistor; the second end of the third resistor is connected to the base of the Darlington tube; the second end of the fourth resistor and the first end of the fifth resistor are respectively connected with the emitter of the Darlington tube; and the second end of the fifth resistor is grounded.