CN113847183B - Heat control module, drive circuit and ignition coil driver - Google Patents
Heat control module, drive circuit and ignition coil driver Download PDFInfo
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- CN113847183B CN113847183B CN202111117053.8A CN202111117053A CN113847183B CN 113847183 B CN113847183 B CN 113847183B CN 202111117053 A CN202111117053 A CN 202111117053A CN 113847183 B CN113847183 B CN 113847183B
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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
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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
- F02P11/00—Safety means for electric spark ignition, not otherwise provided for
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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
- F02P3/05—Layout of circuits for control of the magnitude of the current in the ignition coil
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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
The application relates to a heat control module, a driving circuit and an ignition coil driver, wherein the heat control module is arranged between the driving module and a current detection module, and the output end of the driving module is electrically connected with an ignition coil; the current detection module is electrically connected to the driving module and comprises a feedback resistor RS; the heat control module is arranged in a lead area where leads are distributed on the circuit board, and the lead area is positioned between the feedback resistor RS and the driving module; the wire area is provided with an accommodating part containing liquid conductive metal, the accommodating part extends along the length direction of the wire, the side surface of the wire is exposed in the accommodating part, the volume change of the liquid conductive metal is in positive correlation with the temperature change of the liquid conductive metal, and the liquid conductive metal is attached to the exposed side surface of the wire in the accommodating part and stretches along the length direction of the wire; this application has and does benefit to and reduces the heat gathering degree of drive circuit on the circuit board to the effect that has the life of extension circuit board.
Description
Technical Field
The application relates to the field of automobile igniters, in particular to a heat control module, a drive circuit and an ignition coil driver.
Background
When an automobile engine runs, an ignition device is needed to ignite fuel oil injected into a combustion chamber, and then heat energy and kinetic energy are converted. The existing automobile ignition device is usually realized by a spark plug connected with an ignition coil, the ignition coil is electrically connected in a high-voltage loop, and the spark plug is driven by the ignition coil to perform discharge operation, so that the ignition action is realized. The ignition coil is provided with a special control circuit, also called igniter drive circuit.
In the related art, the igniter driver includes a control signal processor and a driving circuit, the control signal processor receives an ignition signal from a central control system of the vehicle, converts the ignition signal into a control signal, and transmits the control signal to the driving circuit, and the driving circuit outputs the driving signal to the ignition coil in response to the control signal, thereby controlling the operating state of the ignition coil. The control signal is generally a square wave, for example, when the control signal is at a high level, the ignition coil is turned on to operate, and when the control signal is at a low level, the ignition coil is turned off to be not operated.
In the process of implementing the application, the inventor finds that at least the following problems exist in the technology: in the actual working process of the existing driving circuit, when the high level duration of the control signal is too long, the conduction time of the ignition coil is too long, so that the circuit board of the driving circuit can generate heat; when the current parameter in the ignition coil is larger, the circuit board of the driving circuit can also be heated; although the working state of the ignition coil can be limited by arranging the additional current detection module outside the drive circuit, when the additional current detection module detects that the current or the voltage reaches the preset threshold value, the drive circuit and the circuit board always start to generate heat to a certain degree, and the heat on the drive circuit and the circuit board cannot be rapidly controlled, especially the circuit of the ignition coil is directly and electrically connected, the heat is generated more rapidly, so that the heat control on the drive circuit and the circuit board is not facilitated, and the service life of the drive circuit and the circuit board is easily influenced.
Disclosure of Invention
In order to facilitate the control of the heat on the circuit board where the ignition coil driving circuit is located, and reduce the heat accumulation degree of the driving circuit on the circuit board when generating heat, the application provides a heat control module, a driving circuit and an ignition coil driver.
On one hand, the heat control module provided by the application adopts the following technical scheme:
a heat control module is arranged between a driving module and a current detection module, and the output end of the driving module is electrically connected with an ignition coil and used for receiving and responding to a control signal so as to control the on-off state of a loop where the ignition coil is located; the current detection module is electrically connected to the driving module, comprises a feedback resistor RS and is used for acquiring and responding to the current of a loop where the ignition coil is located in real time so as to generate a limit signal for controlling the on-off state of the loop where the ignition coil is located, and the driving module receives and responds to the limit signal; the heat control module is arranged in a lead area where leads are distributed on a circuit board, and the lead area is positioned between the feedback resistor RS and the driving module; the wire district is provided with the portion of holding that contains liquid conductive metal, the portion of holding is followed the length direction of wire extends to be arranged, the side of wire expose in the portion of holding, the volume change of liquid conductive metal is positive correlation setting rather than the temperature variation, liquid conductive metal is in laminate in the portion of holding the exposed side surface of wire and edge the length direction of wire is flexible.
By adopting the technical scheme, in the working process of the driving circuit, when the temperature of the driving circuit on the circuit board is gradually increased, the liquid conductive metal in the accommodating part expands to be connected with more exposed wires with larger areas due to thermal expansion of the liquid conductive metal, and the liquid conductive metal is connected with the wires in parallel everywhere in an area where the liquid conductive metal is newly expanded, so that the resistance value of a conductor in a wire area is reduced; in addition, under the condition of high frequency, according to the electron skin effect on the liquid conductive metal, the flow quantity of electrons in the liquid conductive metal is larger than that of electrons in the lead, so that the heating part is accumulated on the surface of the liquid conductive metal, and the surface of the liquid conductive metal is increased along with the expansion caused by heating, thereby increasing the heat dissipation area; compared with the prior art, the resistance value of the conductor in the lead area is reduced, so that the heating of the lead can be reduced under the condition that the current on the lead is not changed, and the heating of a circuit board is reduced; the reduction of the resistance value of the whole conductor in the lead area can slightly increase the current in the circuit, so that the feedback voltage on the feedback resistor is increased, the current detection module detects the feedback voltage which is increased in advance and responds in advance according to a preset threshold value, and the time of heat accumulation on the driving circuit and the circuit board is shortened; in addition, the expanded liquid conductive metal increases the heat dissipation surface area, and is favorable for further heat dissipation with the heat conduction contact surface to the wire.
Preferably, the liquid conductive metal is located on one side of the lead away from the circuit board, and/or on both sides of the lead in the width direction.
Through adopting above-mentioned technical scheme, the wire on the circuit board is the platykurtic structure, and liquid conductive metal is located the wire and keeps away from one side of circuit board or including the both sides that are located the wire, can have bigger area of contact with the wire, and liquid conductive metal can conduct more heats.
Preferably, the accommodating portion is a groove formed in the circuit board, and the lead is located in a notch of the accommodating portion.
By adopting the technical scheme, the liquid conductive metal is positioned between the lead and the circuit board, and the liquid conductive metal is better in sealing property.
Preferably, the side wall of the receiving portion is provided with a transparent protective layer.
Through adopting above-mentioned technical scheme, when liquid conductive metal is flexible under the wire, the transparent protection layer can outwards refract out the image that liquid conductive metal changed, observes the test operating mode when being favorable to artifical test.
On the other hand, the driving circuit provided by the application adopts the following technical scheme:
a drive circuit comprises a channel signal input module, a drive module, a current detection module and a heat control module;
the channel signal input module comprises a signal end for receiving an ignition signal, compares the ignition signal with a preset voltage value and outputs a control signal corresponding to a comparison result; the output end of the channel signal input module is electrically connected to the input end of the driving module and is used for outputting the control signal to the driving module.
By adopting the technical scheme, the channel signal input module is used for receiving an ignition signal for controlling an ignition coil in an automobile central control system and converting the ignition signal into a control signal acceptable by the driving module; the driving module responds to the control signal to control the working state of the ignition coil with high voltage electricity; by arranging the current detection module, the detected current is converted into feedback voltage by using the feedback resistor RS, and when the current parameter on the ignition coil is overlarge, a loop where the ignition coil is located is switched off, so that the heating is reduced; because ignition coil is connected to the direct electricity of drive module, the branch road at feedback resistor RS place can produce thermal accumulation, establishes heat control module between feedback resistor RS and drive module, is favorable to reducing the heat gathering degree of drive circuit on the circuit board.
Preferably, the channel signal input module comprises a first voltage comparison unit, the signal end is electrically connected to the non-inverting input end of the first voltage comparison unit, and the inverting input end of the first voltage comparison unit is electrically connected to the output end of the reference voltage module; the output end of the first voltage comparison unit is electrically connected to the input end of the driving module.
By adopting the technical scheme, the channel signal input module is used for receiving the ignition signal, the first voltage comparison unit is used for judging the magnitude relation between the ignition signal and the preset voltage threshold, and when the voltage value of the ignition signal is greater than the preset voltage threshold, the control signal output by the first voltage comparison unit is in a high level; otherwise, the output control signal is at low level.
Preferably, the driving module comprises a driving resistor R16 and a switching tube Q1; the switching tube Q1 comprises a control end, a first controlled end and a second controlled end; one end of the driving resistor R16 is electrically connected to the output end of the first voltage comparing unit, the other end of the driving resistor R16 is electrically connected to the control end of the switching tube Q1, the first controlled end of the switching tube Q1 is grounded through the feedback resistor RS, and the second controlled end of the switching tube Q1 is the output end of the driving module; the lead is located between the feedback resistor RS and the first controlled end of the switching tube Q1.
By adopting the technical scheme, the switching tube Q1 is switched on and off according to the high/low level of the control signal output by the first voltage comparison unit; thereby controlling the operation of the ignition coil; for reducing the heat buildup generated on the circuit board between the feedback resistor RS and the first controlled terminal of the switching tube Q1.
Preferably, the current detection module further comprises a summing resistor R5, a summing resistor R6, and a voltage inverting amplification unit; the ungrounded end of the feedback resistor RS is electrically connected to the inverting input terminal of the voltage inverting amplification unit through the summing resistor R5; the summing resistor R6 is electrically connected between the inverting input terminal and the output terminal of the voltage inverting amplification unit; the output end of the voltage inverting amplifying unit is electrically connected with the cathode of the diode D12A, and the anode of the diode D12A is electrically connected with the control end of the switching tube Q1.
By adopting the technical scheme, the current detection module can detect the current fed back by the ignition coil, samples the current of the loop where the ignition coil is positioned through the detection resistor RS, converts the current into the voltage fed back, and performs parameter calculation on the voltage fed back through the voltage inverting amplification unit; if the current in the ignition coil is too large, the feedback voltage on the detection resistor RS is too high, and the larger the feedback voltage is, the lower the signal output by the output end of the voltage inverting amplifying unit is, so that the diode D12A is turned on, the switching tube Q1 is turned off, and the ignition coil does not work.
Preferably, the ignition control circuit further comprises a pulse width limiting module, an input end of the pulse width limiting module is electrically connected to the signal end, an output end of the pulse width limiting module is electrically connected to an input end of the driving module, the pulse width limiting module receives the ignition signal, compares the duration of a single pulse high level in the ignition signal with a preset value, and outputs a limiting signal for limiting the single ignition duration of the control signal to the driving module according to the comparison result;
the pulse width limiting module comprises an energy storage unit and a second voltage comparison unit, wherein the energy storage unit comprises a current limiting resistor R14, an energy storage capacitor C12 and a diode D10B; one end of the current-limiting resistor R14 is a dc charging end, the other end of the current-limiting resistor R14 is grounded through the energy-storage capacitor C12 and is electrically connected to the anode of the diode D10B, and the cathode of the diode D10B is electrically connected to the inverting input terminal of the second voltage comparing unit; the non-inverting input end of the second voltage comparison unit is electrically connected with the output end of the reference voltage module; the output end of the second voltage comparison unit is electrically connected with the cathode of the diode D12A.
By adopting the technical scheme, the pulse width of the ignition signal input by the signal end is limited by utilizing the charge-discharge principle of the energy storage capacitor C12 in the energy storage unit; when the single high level duration time of the ignition signal exceeds a preset value of the set time, the ignition coil is easy to heat, the second voltage comparison unit outputs a low level control signal to the driving module, and the output of the driving module is closed; the degree of heat accumulation of the drive circuit on the circuit board can be reduced.
On the other hand, the technical scheme that an ignition coil driver that this application provided adopts as follows:
an ignition coil driver includes a control signal processor and the above-described drive circuit.
Through adopting above-mentioned technical scheme, adopt above-mentioned drive circuit who has heat control module, be favorable to reducing the heat gathering degree of drive circuit on the circuit board to improve the stability of ignition coil driver work.
In summary, the present application includes at least one of the following beneficial technical effects:
the resistance value of the wire area is reduced by utilizing the thermal expansion performance and the electrical characteristics of the liquid conductive metal; due to the reduction of the resistance value, the current detection module responds in advance according to the detected feedback voltage increased in advance and the preset voltage threshold, and the time for heat accumulation on the driving circuit and the circuit board is shortened; in addition, the expanded liquid conductive metal increases the heat dissipation surface area, is in contact with the heat conduction surface of a lead and is matched with the metal electronic skin effect, so that the heat dissipation is further facilitated, and the heat control on the circuit board is realized;
the liquid conductive metal covers the side wall of the lead, so that a larger contact area can be formed between the liquid conductive metal and the lead, and further heat dissipation is facilitated;
the liquid conductive metal in the groove on the circuit board is combined with the transparent protective layer, so that the heat test working condition on the circuit can be observed conveniently;
the driving circuit is used for receiving and responding to an ignition signal sent by an automobile central control system and generating a driving signal for driving an ignition coil to work; meanwhile, the current detection module monitors the current in the ignition coil in real time, and when the current parameter is overlarge, the ignition coil is turned off; the duration of single high level of the ignition coil is detected in real time through the pulse width limiting module, and when the single electrifying time of the ignition coil is too long, the ignition coil is turned off.
Drawings
Fig. 1 is a schematic overall structure diagram of an embodiment 1 of a thermal control module according to the present application;
FIG. 2 is a cross-sectional view of embodiment 1 of a thermal control module of the present application;
FIG. 3 is a schematic diagram of the overall structure of an embodiment 2 of a thermal control module according to the present application;
FIG. 4 is a cross-sectional view of embodiment 2 of a thermal control module of the present application;
FIG. 5 is a schematic block circuit diagram of a driver circuit of the present application;
fig. 6 is a circuit diagram of a driving circuit of the present application.
Reference numerals: 1. a heat control module; 11. a circuit board; 12. a wire; 13. an accommodating portion; 14. a liquid conductive metal; 15. a transparent protective layer; 2. a channel signal input module; 3. a drive module; 4. a pulse width limiting module; 5. a current detection module; 6. a DC power supply module; 7. and a reference voltage module.
Detailed Description
The present application is described in further detail below with reference to figures 1-6.
The embodiment of the application discloses a heat control module.
Example 1;
referring to fig. 1 and 5, a heat control module is arranged between a driving module 3 and a current detection module 5, wherein an output end of the driving module 3 is electrically connected with an ignition coil and is used for receiving and responding to a control signal so as to control the on-off state of a loop where the ignition coil is located; the current detection module 5 is electrically connected to the driving module 3, and includes a feedback resistor RS for collecting and responding to the current of the loop where the ignition coil is located in real time to generate a limit signal for controlling the on-off state of the loop where the ignition coil is located, and the driving module 3 receives and responds to the limit signal.
Referring to fig. 1 and 2, the heat control module is disposed in a wiring region where the wires 12 are routed on the circuit board 11, and is located between the feedback resistor RS and the driving module 3.
The lead area is provided with an accommodating part 13 containing liquid conductive metal 14, the accommodating part 13 extends along the length direction of the lead 12, and the side surface of the lead 12 is exposed in the accommodating part 13, so that the liquid conductive metal 14 is electrically connected with the lead 12. The volume change of the liquid conductive metal 14 is in positive correlation with the temperature change thereof, and the liquid conductive metal 14 is attached to the exposed side surface of the lead 12 in the accommodating portion 13 and extends and contracts in the length direction of the lead 12 under the influence of temperature. The liquid conductive metal 14 may be provided as gallium or in combination with other metallic materials such as gallium.
Description of specific structure of the housing portion 13: the receiving portion 13 includes a liquid storage region in the shape of a circular arc and an expansion region distributed along the length direction of the lead 12. The expanded region width dimension of the accommodating portion 13 is equal to or greater than the width dimension of the wire 12, or the expanded regions of the accommodating portion 13 are located on both sides in the width direction of the wire 12. In the present embodiment, the expanded region width dimension of the accommodating portion 13 is larger than the width dimension of the lead wire 12, and is covered on the lead wire 12. The side of the conductive wire 12 on the surface of the circuit board 11 away from the circuit board 11 and the two side walls in the width direction are exposed in the accommodating portion 13.
The conducting wire 12 on the circuit board 11, especially the PCB board, the conducting wire 12 is flat, and the above structure can make the conducting wire 12 have more contact area with the liquid conductive metal 14, thereby being beneficial to conducting more heat and reducing the accumulation of heat on the circuit board 11.
The implementation principle of the embodiment 1 of the heat control module is as follows: during operation of the driving circuit, when the driving circuit generates heat accumulation on the circuit board 11, the liquid conductive metal 14 is thermally expanded in the accommodating portion 13 and expanded to connect more exposed leads 12 of larger area. In the area where the exposed wire 12 is reduced, the liquid conductive metal 14 is connected in parallel with the wire 12 everywhere, reducing the resistance of the overall conductor in the wire area. Moreover, under the condition of high frequency, because electrons on the liquid conductive metal 14 have a skin effect, the flow quantity of the electrons in the liquid conductive metal 14 is greater than that of the electrons in the lead 12, so that the heating part is accumulated on the surface of the liquid conductive metal 14, and the surface of the liquid conductive metal 14 is expanded along with the heating, so that the heat dissipation area is increased, and better heat dissipation is facilitated. Compared with the prior art, after the resistance value of the conductor in the lead area is reduced, the heat generation on the lead 12 is reduced under the condition that the current on the lead 12 is not changed, thereby reducing the heat accumulation on the circuit board 11. And the resistance value of the conductor in the whole conductor area is reduced, so that the current in the circuit is slightly increased, the feedback voltage on the feedback resistor RS is increased, the feedback voltage which is increased in advance can be detected by the current detection module 5, the response is advanced according to the preset voltage threshold, and the time of heat accumulation of the driving circuit on the circuit board 11 is shortened. In addition, the expanded liquid conductive metal 14 increases the surface area for heat dissipation and the thermal contact surface with the lead 12, which is beneficial to further reducing the heat accumulation.
Example 2;
referring to fig. 3 and 4, embodiment 2 is substantially the same as embodiment 1 in structure, except that: the accommodating portion 13 is a groove formed in the circuit board 11, and the lead 12 is located at a notch of the accommodating portion 13. The lower surface of the wire 12 is exposed from the accommodating portion 13 and electrically connected to the liquid conductive metal 14. In order to facilitate observation of the working condition on the circuit board 11 in the testing stage, the side wall of the accommodating portion 13 is provided with a transparent protective layer 15, the transparent protective layer 15 is made of epoxy resin, and the transparent protective layer 15 further covers the wire 12 and the circuit board 11, so as to play a role in preventing oxidation and protecting. When the liquid conductive metal 14 stretches under the wire 12, the transparent protective layer 15 can refract the image of the liquid conductive metal 14.
The implementation principle of the embodiment 2 of the thermal control module is as follows: the liquid conductive metal 14 is located inside the circuit board 11 and between the conductive wires 12 and the circuit board 11, so that the liquid conductive metal has better sealing performance. The liquid conductive metal 14 has a larger contact area with the circuit board 11, and can further conduct more heat, which is beneficial to reducing the heat accumulation of the driving circuit on the circuit board 11. The working condition on the circuit board 11 is more convenient to observe by matching with the transparent protective layer 15.
The embodiment of the application discloses a driving circuit.
Referring to fig. 5 and 6, a driving circuit includes a thermal control module 1, a channel signal input module 2, a driving module 3, a pulse width limiting module 4, a current detection module 5, a dc power supply module 6, and a reference voltage module 7 in embodiment 1 or embodiment 2.
The direct current power supply module 6 is used for supplying power to other modules and providing stable direct current voltage output.
The channel signal input module 2 is used for receiving a signal end of an ignition signal sent by an automobile central control system, comparing the ignition signal with a preset voltage threshold value, and outputting a control signal corresponding to a comparison result to the driving module 3.
The driving module 3 is used for receiving and responding to a control signal; the output end of the driving module 3 is electrically connected with an ignition coil to control the on-off state of a loop where the ignition coil is located.
The pulse width limiting module 4 is used for monitoring the duration of single pulse high level in the ignition signal in real time, comparing the duration with the preset pulse width, and outputting a limiting signal used for limiting the duration of single ignition of the control signal to the driving module 3 according to a comparison result, so that the ignition coil is not easy to be excessively long in electrifying time, the current parameter in the ignition coil is not easy to be overlarge, the ignition coil and the driving circuit are not easy to generate heat, and the protection of the driving circuit of the igniter is facilitated.
The current detection module 5 comprises a feedback resistor RS and is used for collecting the current of a loop where the ignition coil is located in real time, generating a detection signal, responding to the detection signal and outputting a limit signal for controlling the on-off state of the loop where the ignition coil is located to the driving module 3, so that the current parameter in the ignition coil is not easy to be too large, and the effect of protecting the driving circuit and the ignition coil is achieved.
The reference voltage module 7 is used for providing a plurality of divided reference voltages, which is convenient for each module to judge the signal.
The heat control module 1 is disposed between the driving module 3 and the current detection module 5, and is located between the feedback resistor RS and the driving module 3.
Referring to fig. 6, the dc power module 6 includes a resistor R1, a zener diode D2, and a filter capacitor C1. The two ends of the resistor R1 are connected in parallel with an input adjusting resistor R1B, one end of the resistor R1 is electrically connected with the positive electrode of an external direct-current power supply, and the external direct-current power supply is a +12V direct-current power supply. The other end of the resistor R1 is grounded through a filter capacitor C1 and electrically connected to the cathode of the zener diode D2, and the anode of the zener diode D2 is grounded. The cathode of the zener diode D2 is the output end of the dc power module 6, and the output voltage of the zener diode D2 in this embodiment is + 5.6V.
The reference voltage module 7 comprises a voltage dividing resistor R2, a voltage dividing resistor R3 and a voltage dividing resistor R4 which are sequentially connected in series, wherein one end, far away from the voltage dividing resistor R3, of the voltage dividing resistor R2 is electrically connected with the output end of the direct current power supply module 6, and one end, far away from the voltage dividing resistor R3, of the voltage dividing resistor R4 is grounded. The two ends of the voltage dividing resistor R4 are also connected in parallel with a voltage dividing adjusting resistor R4B. The voltage at the connection point between the voltage dividing resistor R2 and the voltage dividing resistor R3 is the output end of the first voltage dividing voltage V1; the voltage at the connection point between the voltage dividing resistor R3 and the voltage dividing resistor R4 is the output terminal of the second divided voltage V2.
In the embodiment of the present application, the resistance value of the voltage dividing resistor R2 is: resistance value of voltage-dividing resistor R3: the resistance of the voltage dividing resistor R4 = 6: 3: 2. the first divided voltage V1 is about 2.5V and the second divided voltage V2 is about 1V.
In the embodiment of the present application, the channel signal input module 2 includes a signal terminal INA, an input resistor R13, and a first voltage comparison unit including an operational amplifier U1A.
The signal terminal INA is electrically connected to the non-inverting input terminal of the operational amplifier U1A through the first input resistor R13, and the output terminal of the first divided voltage V1 is electrically connected to the inverting input terminal of the operational amplifier U1A. The signal terminal INA is also grounded through a first capacitor C11, a first resistor R11 is connected in parallel to both ends of the first capacitor C11, and the first capacitor C11 and the first resistor R11 play a role of filtering, so that the input ignition signal is more stable. The output end of the operational amplifier U1A is electrically connected with a pull-up resistor R15, and when the operational amplifier U1A outputs a high level, the pull-up resistor R15 improves the stability of outputting the high level.
In the embodiment of the present application, when the voltage at the input terminal of the signal terminal INA is higher than 2.5V, the output terminal of the operational amplifier U1A outputs a high level. The signal terminal INA is used for receiving an ignition signal, which may be a PWM square wave or other waveform with level variation.
The driving module 3 includes a driving resistor R16 and a switching tube Q1. The switching tube Q1 is an NPN transistor, and is a high-level conducting device, and includes a control terminal, a first controlled terminal, and a second controlled terminal, i.e., a base, an emitter, and a collector, respectively. One end of the driving resistor R16 is electrically connected with the output end of the operational amplifier U1A, and the other end of the driving resistor R16 is electrically connected with the base of the switch tube Q1. The collector of the switching tube Q1 is a driving signal output end OUTA, and is electrically connected with an ignition coil connected with high voltage electricity, and is used for driving the ignition coil to work. The emitter of the switching tube Q1 is grounded through a feedback resistor RS. When the operational amplifier U1A outputs a high level, the switching tube Q1 is turned on, and a driving signal is output from the collector to the ignition coil.
The current detection module 5 further includes a summing resistor R5, a summing resistor R6, an isolation resistor R31, and a voltage inverting amplification unit. The voltage inverting amplification unit includes an operational amplifier U1D. The ungrounded end of the feedback resistor RS is electrically connected to the inverting input of the operational amplifier U1D through the summing resistor R5. The summing resistor R6 is electrically connected between the inverting input of the operational amplifier U1D and the output of the operational amplifier U1D. The non-inverting input of the limiting operational amplifier U1C is electrically connected to the inverting input of the operational amplifier U1D through an isolation resistor R31. The non-inverting input terminal of the operational amplifier U1D is electrically connected to the output terminal of the second divided voltage V2 in the reference voltage module 7. The output terminal of the operational amplifier U1D is electrically connected to the output terminal of the limiting operational amplifier U1C, and are both grounded through the capacitor C3. The output end of the operational amplifier U1D is electrically connected to the cathode of the diode D12A, and the anode of the diode D12A is electrically connected to the control end of the switching tube Q1.
Referring to fig. 6, a thermal control module 1 is located between the emitter of the switching tube Q1 and the ungrounded end of the resistor RS.
The operational amplifier U1D is an inverse adder, the voltage at the output of the operational amplifier U1D is set to V3, and the voltage at the feedback resistor RS is set to VRS. According to the principle of the virtual short and virtual break, the voltage of the non-inverting input terminal of the operational amplifier U1C is limited to be the voltage of the freewheeling resistor R12, and is set as VR 12. Then, according to the circuit principle of the inverse adder, it can be obtained:
v3= -a VRS-b VR12+ c V2, wherein a, b and c are all positive numbers, VR12 is a fixed value when the pulse width is within a predetermined range, and V3 and VRS are in a negative correlation relationship.
When the ignition coil is in a working state, namely the base electrode of the switching tube Q1 is at a high level, when the current parameter in the ignition coil is small, VRS is small, V3 can output a high-level voltage value according to set coefficients a, b and c, and the diode D12A is not conducted at the moment, so that the working state of the ignition coil is not influenced. When the current parameter in the ignition coil is overlarge, the VRS is large at the moment, the V3 outputs a low-level voltage value according to the set coefficients a, b and c, the diode D12A is conducted at the moment, the base electrode of the switching tube Q1 is grounded, and therefore the ignition coil is turned off to work, the current in the ignition coil is monitored and controlled, and the ignition coil and the driving circuit are protected.
The pulse width limiting module 4 includes an energy storage unit and a second voltage comparing unit, wherein the energy storage unit includes a current limiting resistor R14, an energy storage capacitor C12, a diode D10A and a conducting diode D10B. One end of the current-limiting resistor R14 is electrically connected to the output end of the dc power supply module 6, the other end of the current-limiting resistor R14 is grounded via the energy-storage capacitor C12 and electrically connected to the anode of the diode D10A, and the cathode of the diode D10A is electrically connected to the signal terminal INA. The anode of the conduction diode D10B is electrically connected to the anode of the diode D10A, and the cathode of the conduction diode D10B is grounded through the freewheel resistor R12.
The second voltage comparison unit includes a limiting operational amplifier U1C. The non-inverting input terminal of the limiting operational amplifier U1C is electrically connected to the output terminal of the first divided voltage V1 through an isolation resistor R30. The inverting input of the limiting operational amplifier U1C is electrically coupled to the cathode of the conduction diode D10B and the cathode of the second conduction diode D20B. The output of the limiting operational amplifier U1C is electrically connected to the cathode of the diode D12A.
The principle of pulse width limitation is as follows:
when the signal terminal INA continuously outputs a high level, the control terminal of the switching tube Q1 is at a high level, and the energy storage capacitor C12 is charged. In the charging circuit where the energy storage capacitor C12 is located, in this embodiment: resistance value of current limiting resistor R14: the resistance value of the freewheel resistor R12 is 1: 3, the storage capacitor C12 is a capacitor with a large capacitance value, and the maximum voltage is about 3.75V when the storage capacitor C12 is fully charged by using the voltage division principle. Since the voltage at the non-inverting input of the operational amplifier U1C is limited to the first divided voltage V1, which is about 2.5V; and when the voltage on the energy storage capacitor C12 is set to be charged to 2.5V, the time is t1, and the energy storage capacitor C is not fully charged. The set signal terminal INA continuously outputs a high level voltage greater than 3.75V.
Therefore, when the time that the signal terminal INA continues to output the high level does not exceed t1, the voltage on the energy storage capacitor C12 is smaller than 2.5V, i.e., the output of the operational amplifier U1C is limited to output the high level, at this time, the diode D12A is turned off, and the switching tube Q1 operates normally.
When the time that the signal terminal INA continuously outputs the high level exceeds t1, at this time, the voltage on the energy storage capacitor C12 is greater than 2.5V, that is, the output end of the operational amplifier U1C is limited to output the low level, at this time, the diode D12A is turned on, the control terminal of the switching tube Q1 is grounded, and the output of the driving module 3 is turned off.
During the turn-off period, the storage capacitor C12 continues to charge until the storage capacitor C12 discharges through the diode D10A when the signal terminal INA continues to output a low level. Therefore, the pulse width of the ignition signal is limited when the pulse width is too large by utilizing the charge-discharge characteristics of the capacitor, and the cycle limitation can be realized.
Since the output terminal of the operational amplifier U1D is electrically connected to the output terminal of the limiting operational amplifier U1C, the ignition coil is turned off when the current parameter in the ignition coil is too large or the pulse width of the ignition signal is too large. In addition, due to the existence of the isolation resistor R31, the resistance value of the feedback resistor RS can be reduced, and the influence of the feedback resistor RS on a loop in which the ignition coil is arranged is reduced.
The implementation principle of the driving circuit in the embodiment of the application is as follows: the channel signal input module 2 receives an ignition signal for controlling an ignition coil in an automobile central control system, converts the ignition signal into a control signal acceptable by the driving module 3, and the driving module 3 responds to the control signal and controls the working state of the ignition coil with high voltage. The pulse width of the ignition signal is monitored by the pulse width limiting module 4, so that a loop where the ignition coil is located is disconnected after the duration of the single pulse high level in the ignition signal is too long, the adverse effect after the duration of the single pulse high level in the ignition signal is too long is reduced, and the improvement of the service life of the existing igniter driving circuit and the ignition coil is facilitated. Through setting up current detection module 5, when the electric current parameter on ignition coil was too big, turn-off ignition coil place's return circuit does benefit to the life who improves current some firearm drive circuit and ignition coil.
The embodiment of the application discloses an ignition coil driver.
An ignition coil driver includes a control signal processor and the above drive circuit.
The implementation principle of the ignition coil driver in the embodiment of the application is as follows: the above-mentioned drive circuit with heat control module 1 is favorable to reducing the heat accumulation degree of drive circuit on circuit board 11 to improve the stability of ignition coil driver work.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. A heat control module is arranged between a driving module (3) and a current detection module (5), wherein the output end of the driving module (3) is electrically connected with an ignition coil and used for receiving and responding to a control signal so as to control the on-off state of a loop where the ignition coil is located; the current detection module (5) is electrically connected to the driving module (3), comprises a feedback resistor RS and is used for acquiring and responding to the current of a loop where the ignition coil is located in real time so as to generate a limit signal for controlling the on-off state of the loop where the ignition coil is located, and the driving module (3) receives and responds to the limit signal; the method is characterized in that: the heat control module is arranged in a lead area which is arranged on a circuit board (11) and is provided with leads (12), and the lead area is positioned between the feedback resistor RS and the drive module (3); the wire area is provided with the portion of holding (13) that contains liquid conductive metal (14), the portion of holding (13) is followed the length direction of wire (12) extends to be arranged, the side of wire (12) expose in the portion of holding (13), the volume change of liquid conductive metal (14) is positive correlation setting rather than the temperature variation, liquid conductive metal (14) are in laminate in the portion of holding (13) the exposed side surface of wire (12) just follows the length direction of wire (12) is flexible.
2. A thermal control module according to claim 1, wherein: the liquid conductive metal (14) is positioned on one side of the lead (12) far away from the circuit board (11) and/or on two sides of the lead (12) in the width direction.
3. A thermal control module according to claim 1, wherein: the accommodating part (13) is a groove formed in the circuit board (11), and the lead (12) is located in a notch of the accommodating part (13).
4. A thermal control module according to claim 3, wherein: the side wall of the accommodating part (13) is provided with a transparent protective layer (15).
5. A drive circuit, characterized by: the heat control module comprises a channel signal input module (2), a driving module (3), a current detection module (5) and the heat control module (1) of any one of the claims 1-4;
the channel signal input module (2) comprises a signal end for receiving an ignition signal, compares the ignition signal with a preset voltage value and outputs a control signal corresponding to a comparison result; the output end of the channel signal input module (2) is electrically connected to the input end of the driving module (3) and is used for outputting the control signal to the driving module (3).
6. A driving circuit according to claim 5, wherein: the channel signal input module (2) comprises a first voltage comparison unit, the signal end is electrically connected to the non-inverting input end of the first voltage comparison unit, and the inverting input end of the first voltage comparison unit is electrically connected to the output end of a reference voltage module (7); the output end of the first voltage comparison unit is electrically connected to the input end of the driving module (3).
7. A driver circuit according to claim 6, wherein: the driving module (3) comprises a driving resistor R16 and a switching tube Q1; the switching tube Q1 comprises a control end, a first controlled end and a second controlled end; one end of the driving resistor R16 is electrically connected with the output end of the first voltage comparison unit, the other end of the driving resistor R16 is electrically connected with the control end of a switching tube Q1, the first controlled end of the switching tube Q1 is grounded through the feedback resistor RS, and the second controlled end of the switching tube Q1 is the output end of the driving module (3); the lead (12) is located between the feedback resistor RS and the first controlled terminal of the switching tube Q1.
8. A driver circuit according to claim 7, wherein: the current detection module (5) further comprises a summing resistor R5, a summing resistor R6 and a voltage inverting amplification unit; the ungrounded end of the feedback resistor RS is electrically connected to the inverting input terminal of the voltage inverting amplification unit through the summing resistor R5; the summing resistor R6 is electrically connected between the inverting input terminal and the output terminal of the voltage inverting amplification unit; the output end of the voltage inverting amplifying unit is electrically connected with the cathode of the diode D12A, and the anode of the diode D12A is electrically connected with the control end of the switching tube Q1.
9. A driver circuit according to claim 8, wherein: the ignition control circuit further comprises a pulse width limiting module (4), wherein an input end of the pulse width limiting module (4) is electrically connected to the signal end, an output end of the pulse width limiting module (4) is electrically connected to an input end of the driving module (3), the pulse width limiting module (4) receives the ignition signal, compares the duration of a single pulse high level in the ignition signal with a preset value, and outputs a limiting signal for limiting the duration of single ignition of the control signal to the driving module (3) according to the comparison result;
the pulse width limiting module (4) comprises an energy storage unit and a second voltage comparison unit, wherein the energy storage unit comprises a current limiting resistor R14, an energy storage capacitor C12 and a diode D10B; one end of the current-limiting resistor R14 is a dc charging end, the other end of the current-limiting resistor R14 is grounded through the energy-storage capacitor C12 and is electrically connected to the anode of the diode D10B, and the cathode of the diode D10B is electrically connected to the inverting input terminal of the second voltage comparing unit; the non-inverting input end of the second voltage comparison unit is electrically connected with the output end of the reference voltage module (7); the output end of the second voltage comparison unit is electrically connected with the cathode of the diode D12A.
10. An ignition coil driver characterized in that: comprising a control signal processor and a driver circuit as claimed in any one of claims 6 to 9.
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| CN202111117053.8A CN113847183B (en) | 2021-09-23 | 2021-09-23 | Heat control module, drive circuit and ignition coil driver |
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| CN202111117053.8A CN113847183B (en) | 2021-09-23 | 2021-09-23 | Heat control module, drive circuit and ignition coil driver |
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