CN216290173U - Over-temperature protection circuit of ignition module - Google Patents
Over-temperature protection circuit of ignition module Download PDFInfo
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- CN216290173U CN216290173U CN202122841778.3U CN202122841778U CN216290173U CN 216290173 U CN216290173 U CN 216290173U CN 202122841778 U CN202122841778 U CN 202122841778U CN 216290173 U CN216290173 U CN 216290173U
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Abstract
The utility model discloses an over-temperature protection circuit of an ignition module, which comprises a temperature measurement module, a comparison module, a voltage division module, a protection module and the ignition module, wherein the over-temperature protection circuit comprises: the temperature measuring module is used for detecting the temperature of the ignition module and linearly changing the voltage at two ends according to the temperature change of the ignition module; the voltage division module is connected with the power supply and used for providing stable reference voltage to the comparison module; the two input ends of the comparison module are connected with the temperature measurement module and the voltage division module and are used for comparing the voltages at the two ends of the temperature measurement module with a reference voltage and outputting a high-level control signal to the protection module when the voltages at the two ends of the temperature measurement module are greater than the reference voltage; the protection module is used for short-circuiting the ignition module after receiving the control signal with high level so as to enable the ignition module not to work. The utility model uses the discrete component scheme to replace the integrated chip scheme, reduces the cost and the manufacturing difficulty of the ignition module, and simultaneously ensures the functional integrity of the ignition module circuit and the accuracy of the protection circuit.
Description
Technical Field
The utility model relates to the technical field of electronic ignition control systems of automobile engines, in particular to an over-temperature protection circuit of an ignition module.
Background
At present, most of the ignition modules used for automobile electronic injection engine control systems adopt a single-chip microcomputer scheme, the ignition modules are single-chip integration schemes made by using a chip on chip technology, and a power tube, a power tube driving circuit, a current limiting circuit and a temperature protection circuit are integrated into one chip.
The existing chip on chip technology single chip integration scheme has complex manufacturing process, is difficult to produce by domestic manufacturers, can only purchase foreign chips, has high cost, is technically restricted by foreign countries, and is not beneficial to autonomous development.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an over-temperature protection circuit of an ignition module, which aims to solve the problems of complex manufacturing process and high cost of the existing chip on chip technology single-chip integration scheme.
In order to realize the purpose, the following technical scheme is adopted:
the utility model provides an ignition module excess temperature protection circuit, includes temperature measurement module, comparison module, partial pressure module, protection module and ignition module, wherein:
the temperature measuring module is used for detecting the temperature of the ignition module and linearly changing the voltage at two ends according to the temperature change of the ignition module;
the voltage division module is connected with a power supply and used for providing stable reference voltage to the comparison module;
the two input ends of the comparison module are connected with the temperature measurement module and the voltage division module and are used for comparing the voltages at the two ends of the temperature measurement module with the reference voltage and outputting a high-level control signal to the protection module when the voltages at the two ends of the temperature measurement module are greater than the reference voltage;
the protection module is used for short-circuiting the ignition module after receiving the control signal with high level so as to enable the ignition module not to work.
Furthermore, the temperature measuring module comprises a schottky diode, the cathode of the schottky diode is connected with the power supply, and the anode of the schottky diode is connected with the input end of the comparing module.
Further, the comparison module comprises a voltage comparator, a positive phase input end of the voltage comparator is connected with the positive electrode of the schottky diode, and a negative phase input end of the voltage comparator is connected with the voltage division module.
Furthermore, the protection module comprises a triode, the base of the triode is connected with the output end of the comparison module, the emitter of the triode is grounded, and the collector of the triode is connected between the input end of the ignition module and the output end of the driving module.
Further, the ignition module comprises a Darlington tube, and the base electrode of the Darlington tube is connected with the collector electrode of the triode.
Furthermore, a current limiting module is arranged between the base of the Darlington tube and the output end of the driving module, and the current limiting module is used for short-circuiting the Darlington tube to the ground after the current output by the driving module exceeds a threshold value.
Further, current limiting module includes reference voltage source and first resistance, second resistance and third resistance, reference voltage source first resistance second resistance with third resistance parallelly connected set up in the base of darlington pipe with between drive module's the output, reference voltage source's negative pole is connected drive module's output, reference voltage source's negative pole ground connection drive module flows to behind the electric current of darlington pipe surpasses the threshold value, reference voltage source switches on and makes darlington pipe short circuit to ground.
By adopting the scheme, the utility model has the beneficial effects that:
the scheme of using discrete components to replace the scheme of an integrated chip reduces the cost and the manufacturing difficulty of the ignition module, and simultaneously ensures the functional integrity of the ignition module circuit and the accuracy of the protection circuit.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
The utility model is described in detail below with reference to the figures and the specific embodiments.
Referring to fig. 1, an over-temperature protection circuit of an ignition module 5 includes a temperature measurement module 1, a comparison module 2, a voltage division module 3, a protection module 4 and an ignition module 5, wherein:
the temperature measuring module 1 is used for detecting the temperature of the ignition module 5 and linearly changing the voltage at two ends according to the temperature change of the ignition module 5;
the voltage division module 3 is connected with the power supply 6 and used for providing stable reference voltage to the comparison module 2;
the two input ends of the comparison module 2 are connected with the temperature measurement module 1 and the voltage division module 3, and are used for comparing the voltage at the two ends of the temperature measurement module 1 with a reference voltage, and outputting a high-level control signal to the protection module 4 when the voltage at the two ends of the temperature measurement module 1 is greater than the reference voltage;
the protection module 4 is used for short-circuiting the ignition module 5 after receiving the control signal of high level, so that the ignition module 5 does not work.
Wherein, temperature measurement module 1 is to ignition module 5 temperature measurement, and in the concrete application with temperature measurement module 1 setting in the position that is close to ignition module 5, ignition module 5's temperature is through heat-conduction to temperature measurement module 1 for 1 perception temperature change of temperature measurement module.
The temperature measuring module 1 comprises a Schottky diode D1, the cathode of the Schottky diode D1 is connected with the power supply 6, and the anode of the Schottky diode D1 is connected with the input end of the comparison module 2. Specifically, the schottky diode D1 may be a diode of type BAT46, and the schottky diode D1 is used as a temperature sensing element, when the temperature rises, the voltage across the schottky diode D1 drops, and the potential of the cathode of the schottky diode D1 rises.
The comparison module 2 comprises a voltage comparator U1A, a positive phase input terminal of the voltage comparator U1A is connected with the positive electrode of the schottky diode D1, and a negative phase input terminal of the voltage comparator U1A is connected with the voltage division module 3. Specifically, when the temperature rises, the voltage across the schottky diode D1 drops, the potential of the cathode of the schottky diode D1 rises, and the output of the voltage comparator U1A becomes high after the temperature reaches the temperature protection threshold.
The protection module 4 comprises a triode Q1, the base of the triode Q1 is connected with the output end of the comparison module 2, the emitting electrode is grounded, and the collector is connected between the input end of the ignition module 5 and the output end of the driving module 7; the ignition module 5 comprises a Darlington transistor Q2, and the base of the Darlington transistor Q2 is connected with the collector of a triode Q1. The voltage comparator U1A outputs a control signal which becomes high level, the base of the transistor Q1 is turned on after receiving the control signal, the current which is output by the driving module 7 and reaches the linton tube Q2 enters from the collector of the transistor Q1, so that the darton tube Q2 is short-circuited and cannot be turned on, the temperature protection function is triggered, the ignition module 5 stops working, and the ignition module 5 is prevented from being damaged due to over-temperature, when the temperature drops, the voltage at two ends of the schottky diode D1 rises, the potential of the cathode of the diode decreases, and after the temperature is lower than the temperature protection threshold value, the output of the voltage comparator U1A becomes low level, the transistor Q1 is turned off, and the darton tube Q2 can normally work.
A current limiting module 8 is arranged between the base of the darlington tube Q2 and the output end of the driving module 7, and the current limiting module 8 is used for short-circuiting the darlington tube Q2 to the ground after the current output by the driving module 7 exceeds a threshold value. The current limiting module 8 is arranged to place the current output by the driver module 7 to the ignition module 5 in excess of a limit, thereby protecting the ignition module 5.
The current limiting module 8 comprises a reference voltage source Q3, a first resistor R6, a second resistor R9 and a third resistor R10, the reference voltage source Q3, the first resistor R6, the second resistor R9 and the third resistor R10 are arranged between the base of the darlington tube Q2 and the output end of the driving module 7 in parallel, the negative electrode of the reference voltage source Q3 is connected with the output end of the driving module 7, the negative electrode of the reference voltage source Q3 is grounded, and after the current flowing to the darlington tube Q2 of the driving module 7 exceeds a threshold value, the reference voltage source Q3 is conducted to enable the darlington tube to be short-circuited to the ground. The reference voltage source Q3, the first resistor R6, the second resistor R9 and the third resistor R10 form a current limiting circuit, when the current exceeds a threshold value, the reference voltage source Q3 is conducted, a base signal of the Darlington tube Q2 is short-circuited to the ground, and the current limiting function is achieved.
The voltage dividing module 3 comprises resistors R1 and R2, and the resistors R1 and R2 are used for dividing voltage and providing reference voltage for the voltage comparator U1A.
The principle of the utility model is as follows: the Schottky diode D1 is used as a temperature measurement sensitive element, when the temperature rises, the voltage at two ends of the Schottky diode D1 drops, the potential of the cathode of the Schottky diode D1 rises, after the temperature reaches a temperature protection threshold value, the output of the voltage comparator U1A becomes high level, the triode Q1 is conducted, the base signal of the Darlington tube Q2 is short-circuited to the ground, the Darlington tube Q2 cannot be conducted, the temperature protection function is triggered, and the ignition module stops working; when the temperature drops, the voltage at two ends of the Schottky diode D1 rises, the potential of the cathode of the Schottky diode D1 is reduced, after the temperature is lower than a temperature protection threshold value, the output of the voltage comparator U1A becomes low level, the triode Q1 is turned off, the Darlington tube Q2 can normally work, the reference voltage source Q3, the first resistor R6, the second resistor R9 and the third resistor R10 form a current limiting circuit, and when the current exceeds the threshold value, the reference voltage source Q3 is turned on to short a base signal of the Darlington tube Q2 to the ground, so that the current limiting function is realized.
The utility model replaces the original integrated circuit scheme with the discrete elements such as the voltage comparator U1A, the Schottky diode D1, the triode Q1, the reference voltage source Q3 and the like, reduces the manufacturing difficulty and the cost of the ignition module and improves the economic benefit under the condition of keeping all the functions of the integrated scheme.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The utility model provides an ignition module excess temperature protection circuit which characterized in that, includes temperature measurement module, comparison module, partial pressure module, protection module and ignition module, wherein:
the temperature measuring module is used for detecting the temperature of the ignition module and linearly changing the voltage at two ends according to the temperature change of the ignition module;
the voltage division module is connected with a power supply and used for providing stable reference voltage to the comparison module;
the two input ends of the comparison module are connected with the temperature measurement module and the voltage division module and are used for comparing the voltages at the two ends of the temperature measurement module with the reference voltage and outputting a high-level control signal to the protection module when the voltages at the two ends of the temperature measurement module are greater than the reference voltage;
the protection module is used for short-circuiting the ignition module after receiving the control signal with high level so as to enable the ignition module not to work.
2. The ignition module over-temperature protection circuit of claim 1, wherein the temperature measurement module comprises a schottky diode, a cathode of the schottky diode is connected to the power supply, and an anode of the schottky diode is connected to the input terminal of the comparison module.
3. The ignition module over-temperature protection circuit of claim 2, wherein the comparison module comprises a voltage comparator, a positive input terminal of the voltage comparator is connected with a positive electrode of the Schottky diode, and a negative input terminal of the voltage comparator is connected with the voltage division module.
4. The over-temperature protection circuit of claim 1, wherein the protection module comprises a transistor, a base of the transistor is connected to the output of the comparison module, an emitter of the transistor is grounded, and a collector of the transistor is connected between the input of the ignition module and the output of the driving module.
5. The over-temperature protection circuit of claim 4, wherein the ignition module comprises a Darlington transistor, and a base of the Darlington transistor is connected with a collector of the triode.
6. The over-temperature protection circuit of the ignition module as claimed in claim 5, wherein a current limiting module is arranged between the base of the Darlington tube and the output end of the driving module, and the current limiting module is used for short-circuiting the Darlington tube to the ground after the current output by the driving module exceeds a threshold value.
7. The over-temperature protection circuit of claim 6, wherein the current limiting module comprises a reference voltage source, a first resistor, a second resistor and a third resistor, the reference voltage source, the first resistor, the second resistor and the third resistor are arranged between the base of the Darlington tube and the output end of the driving module in parallel, the negative electrode of the reference voltage source is connected with the output end of the driving module, the negative electrode of the reference voltage source is grounded, and when the current flowing to the Darlington tube from the driving module exceeds a threshold value, the reference voltage source is conducted to short the Darlington tube to the ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122841778.3U CN216290173U (en) | 2021-11-18 | 2021-11-18 | Over-temperature protection circuit of ignition module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122841778.3U CN216290173U (en) | 2021-11-18 | 2021-11-18 | Over-temperature protection circuit of ignition module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216290173U true CN216290173U (en) | 2022-04-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122841778.3U Active CN216290173U (en) | 2021-11-18 | 2021-11-18 | Over-temperature protection circuit of ignition module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216290173U (en) |
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2021
- 2021-11-18 CN CN202122841778.3U patent/CN216290173U/en active Active
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