CN102338836A - Floating power supply detecting circuit of ignition circuit - Google Patents
Floating power supply detecting circuit of ignition circuit Download PDFInfo
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- CN102338836A CN102338836A CN2011102851669A CN201110285166A CN102338836A CN 102338836 A CN102338836 A CN 102338836A CN 2011102851669 A CN2011102851669 A CN 2011102851669A CN 201110285166 A CN201110285166 A CN 201110285166A CN 102338836 A CN102338836 A CN 102338836A
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- 238000007667 floating Methods 0.000 title abstract description 3
- 238000012360 testing method Methods 0.000 claims description 33
- 238000010304 firing Methods 0.000 claims description 27
- 230000005669 field effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 6
- 238000001514 detection method Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The invention discloses a floating power supply detecting circuit of an ignition circuit. A 5V working power source and a 0/5/27V charging end power source supply power for a comparator, the working power source is connected with the anode of a diode V1, the cathode of the diode V1 is connected with a VCC (Virtual Channel Connection) positive pin of the comparator, the charging end power source is connected with the anode of a diode V2, the cathode of the diode V2 is connected with the VCC positive pin of the comparator, and the grounds of the two power sources are connected to a VCC negative pin of the comparator; the working power source is connected to one end of a resistor R4, the other end of the resistor R4 is connected to a reverse input end of the comparator and one end of a resistor R5, the other end of the resistor R5 is connected to the grounds of the power sources, the working power source is connected with one end of a resistor R6, and the other end of the R6 is connected to an output end of the comparator. The invention has the advantages of greatly improving the safety of the ignition circuit in the detection process, simplifying the circuit, reducing the cost of the circuit and improving the reliability of the circuit.
Description
Technical field
The present invention relates to the unsteady handoff technique of a kind of circuit supply.
Background technology
Engine igniting circuit is generally formed (the firing circuit theory diagram is seen Fig. 1) by control circuit, driving circuit, ignition circuit, testing circuit, accessory power supply, lighter etc.Testing circuit is used for detecting ignition circuit and lighter work whether normal (testing circuit principle of work circuit diagram is seen Fig. 2), and testing circuit mainly is made up of comparer.Because the voltage of comparator input terminal collection is 0V, three kinds of 5V and 27V, testing circuit are under 0V and the 5V situation at input end only, and test output valve just Be Controlled circuit is gathered, and when input end was 27V, test output valve not Be Controlled circuit was gathered.The firing circuit outside provides two kinds of power supplys, and a kind of is that working power is direct current 5V, and a kind of is the charge power supply that is used to light a fire, and charge power supply has three kinds of states: power-off state, promptly do not supply power; 5V power supply power supply state, i.e. ignition circuit test mode; 27V power supply power supply state, i.e. normal operating conditions.
Principle of work by comparer can know that WV must be more than or equal to the voltage of input end, and comparer just can not damage.Testing circuit comparer power supply in the existing firing circuit is that 30V boosts to 30V by accessory power supply with 5V, so just satisfies the condition of work of comparer by the 30V power supply.The WV that can make the heating of lighter bridge silk accomplish engine ignition is about 17V, says from safety perspective, 30V in testing process, occurs and belongs to dangerous magnitude of voltage; Security reliability to firing circuit impacts like this, increases accessory power supply on the other hand and comes also to have increased the complexity of circuit to the comparer power supply; Many components and parts have been increased; Reduced the reliability of circuit, be exactly in addition accessory power supply be Switching Power Supply because Switching Power Supply inside contains switch triode, rectification and fly-wheel diode and power inductance; These devices are work under high voltage, big electric current and high frequency all; And mostly the voltage and current waveform of work be square wave, can produce very strong switching noise thus, and self circuit and external device are caused electromagnetic interference (EMI).
Summary of the invention
Influence ignition circuit property, complicated circuit and have deficiencies such as strong switching noise in order to overcome prior art; The present invention provides the unsteady power supply of a kind of firing circuit testing circuit; Can improve the security of firing circuit in testing process greatly; Simplify circuit, reduced circuit cost, improved circuit reliability.
The technical solution adopted for the present invention to solve the technical problems is: comprise two diodes and a comparer; 5V is the 5V working power that the outside provides; 0/5/27V is the charging end power supply that the outside provides; External charging end power supply has three kinds of voltages, is respectively 0V, 5V, 27V, and these two kinds of power supplys are common ground.Comparator works is by two kinds of power voltage supplies, and a kind of is the power supply of 5V working power, and a kind of is to be supplied power to comparer by the charging end power supply.5V is connected with the anode of diode V1; The negative electrode of diode V1 is connected with the positive pin of the VCC of comparer; 0/5/27V is connected with the anode of diode V2, and the negative electrode of diode V2 is connected with the positive pin of comparer VCC, and the ground of two power supplys is connected on the negative pin of VCC of comparer.When firing circuit was in the testing state, the voltage of input end was at 4.5V in the same way for comparer, and 5V gives comparer VCC positive pin power supply through diode V1 negative electrode, and diode V2 is in reverse blocking state; When formal igniting, charging end voltage is 27V, and the voltage of input end is at 26.5V in the same way for comparer, and 27V gives comparer VCC positive pin power supply through diode V2 negative electrode, and diode V1 is in reverse blocking state.Comparator works voltage satisfies the comparator works condition all the time more than or equal to comparator input terminal voltage like this, and comparer is damaged.5V receives an end of resistance R 4, and the other end of resistance R 4 is received an end of comparer reverse input end and resistance R 5, and the other end of R5 is received power supply on the ground.The comparer reverse input end be through two resistance R 4 and R5 dividing potential drop as a reference voltage come with the voltage ratio of input end in the same way; If the voltage of input end is greater than the voltage of reverse input end in the same way; Then output terminal is high; The voltage of input end is less than the voltage of reverse input end in the same way, and then output terminal is low.5V is connected with an end of resistance R 6, and the other end of R6 is connected on the comparator output terminal, to output drive current is provided.
The present invention can also expand in the unsteady feed circuit of other modes, is the 5V working power that the outside provides like 5V, and 0/5/27V is the charging end power supply that the outside provides, and it is 0V, 5V, 27V that the external charging end has three kinds of voltages, and these two kinds of power supplys are common ground.Comparator works is by two kinds of power voltage supplies; A kind of is the power supply of 5V working power, and a kind of is to be supplied power to comparer by charging end voltage, and 5V is connected with the drain electrode of FET V3; Source electrode is connected with the positive pin of comparer VCC; 0/5/27V is connected with the drain electrode of FET V4, and the source electrode of FET V4 is connected with the positive pin of comparer VCC, and the ground of two power supplys is connected on the negative pin of VCC of comparer.When firing circuit is in the testing state; The comparer voltage of input end in the same way is 4.5V, gives FET V3 grid 5V control signal, gives FET V4 grid 0V control signal; 5V just supplies power for comparer VCC through FET V3, and FET V4 is in off-state; When charging end voltage is 27V; The comparer voltage of input end is in the same way given FET V4 grid 5V control signal at 26.5V, gives FET V3 grid 0V control signal; 27V just supplies power for comparer VCC through FET V4, and FET V3 is in off-state.Comparator works voltage satisfies the comparator works condition all the time more than or equal to comparator input terminal voltage like this, and comparer is damaged.The positive pin of comparer VCC is received an end of resistance R 7, and the other end of resistance R 7 is received an end of comparer reverse input end and resistance R 8, and the other end of resistance R 8 is received power supply on the ground.5V is connected with an end of resistance R 9, and the other end of resistance R 9 is connected on the comparator output terminal, to output drive current is provided.
The present invention can control the unsteady power supply of a plurality of power supplys by a plurality of FETs; Each power supply is connected with the drain electrode of a FET; The source electrode of FET is connected with circuit; When the grid of field effect pipe obtains a cut-in voltage signal, FET just is in conducting state, and this road power supply is just given circuit supply.
The invention has the beneficial effects as follows: former firing circuit testing circuit power supply is provided by booster circuit; 10 of the partly total components and parts of booster circuit; The power supply of floating now only needs two diodes or FET just can solve firing circuit testing circuit powerup issue, solves the unsafe factor that former firing circuit exists in testing process, and for firing circuit; Reduce the value volume and range of product of components and parts, improved the reliability of ignition control circuit.The invention solves former booster circuit and have the HF switch electromagnetic interference (EMI), for firing circuit self and the extraneous deficiency that all can impact, and since firing circuit under the constant situation of function; Simplify circuit through improving; Reduced cost, improved reliability of products, in welding; Debugging has reduced the booster circuit operation in the process of the test.
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Description of drawings
Fig. 1 is the firing circuit theory diagram;
Fig. 2 is former testing circuit schematic diagram;
Fig. 3 is the power supply testing circuit schematic diagram that floats;
Fig. 4 is the power supply FET control principle figure one that floats;
Fig. 5 is the power supply FET control principle figure two that floats.
Embodiment
Embodiment one:
It is 5V that certain model firing circuit, known outside provide working power voltage, and charge power supply is 27V, except that the power supply of above-mentioned state, must not occur the third direct supply that other is higher than 5V in the mission requirements firing circuit.The voltage of testing circuit collection is 0V, and three kinds of 5V and 27V, testing circuit are under 0V and the 5V situation at input end only, and test output valve just Be Controlled circuit is gathered, and when input end was 27V, test output valve not Be Controlled circuit was gathered.
To above situation; Can adopt the present invention to the testing circuit (see figure 3) of supplying power,, give comparer LM139 power supply through diode V1 (model is 1N4148) by the 5V working power when firing circuit is in detected state following time; When firing circuit is in igniting charged state following time; Supplied power to comparer through diode V2 (model is 1N4148) by charging end 27V power supply, comparer feeder ear voltage is in than under the big situation of input terminal voltage all the time like this, and comparer is damaged.The resistance of resistance R 1 is 1.3k, and the resistance of resistance R 2 is 5.1k, is 4V so 5V gives the reference voltage of the reverse input end of comparer LM139 after through two electric resistance partial pressures, thus when comparer in the same way terminal voltage be higher than 4V, comparer is output as height so; When comparer in the same way terminal voltage be lower than 4V, comparer is output as low so.Comparer output R6 is a pull-up resistor, and resistance is 10k.
Embodiment two:
It is 5V that certain model firing circuit, known outside provide working power voltage, and charge power supply is 27V, except that the power supply of above-mentioned state, must not occur the third direct supply that other is higher than 5V in the mission requirements firing circuit.As shown in Figure 4, the voltage of testing circuit collection is 0V, three kinds of 5V and 27V, and testing circuit is 0V at input end, under 5V and the 27V situation, test output valve Be Controlled circuit is gathered.When firing circuit is in detected state following time; Give comparer LM139 power supply by the 5V working power through FET V3 (model is IRF3205SR); When firing circuit is in igniting charged state following time; Supplied power to comparer through FET V4 (model is IRF3205SR) by charging end 27V power supply, comparer feeder ear voltage is in than under the big situation of input terminal voltage all the time like this, and comparer is damaged.The resistance of resistance R 1 is 1.3k, and the resistance of resistance R 2 is 5.1k.After voltage 5V is through two electric resistance partial pressures, giving the reference voltage of the reverse input end of comparer LM139 is 4V, thus when comparer in the same way terminal voltage be higher than 4V, comparer is output as height so; When comparer in the same way terminal voltage be lower than 4V, comparer is output as low so.After voltage 27V is through two electric resistance partial pressures, giving the reference voltage of the reverse input end of comparer LM139 is 21.5V, thus when comparer in the same way terminal voltage be higher than 21.5V, comparer is output as height so; When comparer in the same way terminal voltage be lower than 21.5V, comparer is output as low so.Comparer output R6 is a pull-up resistor, and resistance is 10k.
Embodiment three:
Certain model sensor circuit, the voltage signal of known external detection are 5V signal, 12V signal and 28V signal, and testing circuit need switch the power supply that different voltages are provided to circuit according to the difference of external detection voltage signal.As shown in Figure 5, when detectable voltage signals is 5V, give signal 3 high level 5V, power supply one 9V gives circuit supply through FET V5 (model is IRF3205SR); When detectable voltage signals is 12V, give signal 4 high level 5V, power supply two 15V give circuit supply through FET V6 (model is IRF3205SR); When detectable voltage signals is 28V, give signal 5 high level 5V, power supply two 30V give circuit supply through FET V7 (model is IRF3205SR).So just accomplished the function that power supply switches.
Claims (3)
1. the firing circuit power supply testing circuit that floats; Comprise two diodes and a comparer, it is characterized in that: comparer is by 5V working power and the power supply of 0/5/27V charging end power supply, and the 5V working power is connected with the anode of diode V1; The negative electrode of diode V1 is connected with the positive pin of the VCC of comparer; 0/5/27V charging end power supply is connected with the anode of diode V2, and the negative electrode of diode V2 is connected with the positive pin of comparer VCC, and the ground of two power supplys is connected on the negative pin of VCC of comparer; The 5V working power is received an end of resistance R 4; The other end of resistance R 4 is received an end of comparer reverse input end and resistance R 5; The other end of resistance R 5 is received power supply on the ground, and the 5V working power is connected with an end of resistance R 6, and the other end of R6 is connected on the comparator output terminal.
2. the unsteady power supply of firing circuit according to claim 1 testing circuit; It is characterized in that: described diode replaces with FET, and the 5V working power is connected with the drain electrode of FET V3, and source electrode is connected with the positive pin of comparer VCC; 0/5/27V charging end power supply is connected with the drain electrode of FET V4; The source electrode of FET V4 is connected with the positive pin of comparer VCC, and the grid of FET V3 and FET V4 is connection control signal respectively, and the positive pin of comparer VCC is received an end of resistance R 7; The other end of resistance R 7 is received an end of comparer reverse input end and resistance R 8, and the other end of resistance R 8 is received power supply on the ground.
3. the unsteady power supply of firing circuit according to claim 1 testing circuit; It is characterized in that: described FET is controlled the unsteady power supply of a plurality of power supplys; Each power supply is connected with the drain electrode of a FET, and the source electrode of FET is connected with circuit, when the grid of field effect pipe obtains a cut-in voltage signal; FET just is in conducting state, and this road power supply is just given circuit supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110285166 CN102338836B (en) | 2011-09-22 | 2011-09-22 | Floating power supply detecting circuit of ignition circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110285166 CN102338836B (en) | 2011-09-22 | 2011-09-22 | Floating power supply detecting circuit of ignition circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102338836A true CN102338836A (en) | 2012-02-01 |
| CN102338836B CN102338836B (en) | 2013-06-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110285166 Active CN102338836B (en) | 2011-09-22 | 2011-09-22 | Floating power supply detecting circuit of ignition circuit |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3921067A (en) * | 1974-06-24 | 1975-11-18 | Us Navy | Stray energy detection circuit |
| US5630404A (en) * | 1994-05-26 | 1997-05-20 | Ducati Energia S.P.A. | Selectively power feeding device for electrical loads and the ignition circuit of internal combustion engines, in motor-vehicles |
| CN2303305Y (en) * | 1997-07-11 | 1999-01-06 | 石家庄市拓普科技开发有限公司 | Portable electric faults locating arrangement for automobile, motor cycle |
| FR2905179A1 (en) * | 2006-08-24 | 2008-02-29 | Renault Sas | Electronic firing circuit diagnosing device for engine of vehicle, has control and diagnostic unit receiving information on inlet and delivering alert signal if information translates terminal voltage different from voltage value |
-
2011
- 2011-09-22 CN CN 201110285166 patent/CN102338836B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3921067A (en) * | 1974-06-24 | 1975-11-18 | Us Navy | Stray energy detection circuit |
| US5630404A (en) * | 1994-05-26 | 1997-05-20 | Ducati Energia S.P.A. | Selectively power feeding device for electrical loads and the ignition circuit of internal combustion engines, in motor-vehicles |
| CN2303305Y (en) * | 1997-07-11 | 1999-01-06 | 石家庄市拓普科技开发有限公司 | Portable electric faults locating arrangement for automobile, motor cycle |
| FR2905179A1 (en) * | 2006-08-24 | 2008-02-29 | Renault Sas | Electronic firing circuit diagnosing device for engine of vehicle, has control and diagnostic unit receiving information on inlet and delivering alert signal if information translates terminal voltage different from voltage value |
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| CN102338836B (en) | 2013-06-12 |
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