CN105048839A - Vehicle-mounted power supply driving circuit - Google Patents
Vehicle-mounted power supply driving circuit Download PDFInfo
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- CN105048839A CN105048839A CN201510531083.1A CN201510531083A CN105048839A CN 105048839 A CN105048839 A CN 105048839A CN 201510531083 A CN201510531083 A CN 201510531083A CN 105048839 A CN105048839 A CN 105048839A
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Abstract
The invention discloses a vehicle-mounted power supply driving circuit which comprises a photoelectric coupler, a filter circuit, a pull-up resistor, a current limitation resistor, an amplifier and a feedback circuit, wherein the photoelectric coupler comprises a first input end, a second input end, a first output end and a second output end, the feedback circuit comprises a first resistor and a second resistor, the first output end is divided into two paths, one path is connected with an external second direct current power supply via the pull-up resistor, the other path is connected with a negative input end of the amplifier, the second resistor is connected between a positive input end of the amplifier and the ground, the first resistor is connected between the positive input end and an output end of the amplifier, the filter circuit comprises three filter capacitors which are connected in parallel and have unequal capacitance values, and each filter capacitor differs from others by at least one order of magnitude. By applying the amplifier circuit and the negative feedback circuit, an output signal of an optical coupling isolation circuit is amplified and adjusted, output power is effectively enhanced, and the output is more stable.
Description
Technical field
The present invention relates to a kind of vehicle power drive circuit, belong to electronic circuit field.
Background technology
In general insulating power supply, light-coupled isolation feedback is a kind of mode of simple, low cost.But for various connected mode and the difference thereof of opto-coupled feedback, have not yet to see more deep research.And in many instances, owing to understanding not deep enough to the operation principle of optocoupler, optocoupler connection is chaotic, often causes circuit cisco unity malfunction.This research by labor optocoupler operation principle, and for several typical connection comparative study in addition of opto-coupled feedback.
Common several connected mode and operation principle thereof:
The optocoupler model being usually used in feeding back has TLP521, PC817 etc.Here for TLP521, the characteristic of this kind of optocoupler is introduced.
The former limit of TLP521 is equivalent to a light-emitting diode, and primary current If is larger, and light intensity is stronger, and the electric current I c of secondary triode is larger.The ratio of secondary triode electric current I c and former limit diode current If is called the current amplification factor of optocoupler, and this coefficient varies with temperature and changes, and temperature influence is larger.The optocoupler being used as to feed back utilizes just, and " primary current change will cause secondary current to change " realizes feedback, therefore in the occasion that variation of ambient temperature is violent, because the temperature drift of amplification coefficient is larger, should tries one's best and not realize feedback by optocoupler.In addition, use this kind of optocoupler to must be noted that to design ambient parameters, make it be operated in wider linear tape, otherwise circuit is too strong to the susceptibility of operational factor, is unfavorable for the steady operation of circuit.
Usual selection TL431 feeds back in conjunction with TLP521.At this moment, it is the voltage error amplifier of 2.5V that the operation principle of TL431 is equivalent to an internal reference, so between its 1 pin and 3 pin, connect compensating network.
Common opto-coupled feedback the 1st kind of connection, Vo is output voltage, and Vd is the supply power voltage of chip.Com signal connects the error amplifier output pin of chip, or the builtin voltage error amplifier of PWM chip (as UC3525) is connected into in-phase amplifier form, and com signal then receives the in-phase end pin of its correspondence.
The 2nd kind of common connection, with the 1st kind of connection unlike, in this connection, the 4th pin of optocoupler directly receives the error amplifier output of chip, and the voltage error amplifier of chip internal must be connected into the form of in-phase end current potential higher than end of oppisite phase current potential, utilize a kind of characteristic of amplifier, when amplifier output current excessive (exceeding amplifier current output capability), the output voltage values of amplifier will decline, output current is larger, and output voltage declines more.Therefore, adopt the circuit of this connection, two of the error amplifier of a PWM chip input pin must be received on fixed potential, and must be that terminal potential, higher than backward end current potential, makes error amplifier initial output voltage for high in the same way.
The 3rd kind of common connection, many resistance R6, the effect of this resistance additionally injects an electric current to TL431, avoid TL431 because Injection Current is too small cisco unity malfunction.In fact as suitably chosen resistance value R3, resistance R6 can omit.Adjustment process is substantially consistent with Fig. 1 connection.
The 4th kind of common connection, this connection and the 2nd kind of connection similar, difference be com end with optocoupler the 4th pin between met a resistance R4 more, its effect is consistent with the R6 in the 3rd kind of connection, and its operation principle is substantially with connection 2.
Vehicle power is not only applicable to onboard system, as long as there is the occasion of DC12V DC power supply, all can use power inverter, DC12V is converted to AC220V alternating current, bring convenience to the life of people.Vehicle power fully takes into account outside environment for use, automatically will protect shutdown when there is overload or short circuit phenomenon.The output voltage of vehicle power can make voltage stabilization by the feedback acknowledgment of itself, and unloaded with specified magnitude of voltage change is less than 10V.It should be noted that, the object of vehicle power exports the voltage identical with civil power, meet the needs of electrical appliance, but what in fact vehicle power exported is analog sine, and civil power is real sine wave, both are slightly different, generally do not affect use, and this is the operation principle decision of vehicle power.
At present, the output of vehicle power constantly should regulate according to demand, but the adjustable scope of output of vehicle power is little at present, and serious forgiveness is low, and often there will be the too low phenomenon of power, can cause reduce the useful life of vehicle power.And the crosstalk of external power source or signal also often causes vehicle power to export instability, easily cause module damage.
Summary of the invention
Technical problem to be solved by this invention is: provide a kind of light-coupled isolation vehicle power drive circuit, solves the low and problem of jitter of prior art vehicle power power output.
The present invention, for solving the problems of the technologies described above, adopts following technical scheme:
A kind of vehicle power drive circuit, comprise photoelectrical coupler, filter circuit, pull-up resistor, current-limiting resistance, amplifier, feedback circuit, described photoelectrical coupler comprises first input end, second input, first output, second output, described feedback circuit comprises the first resistance and the second resistance, wherein, first input end is connected with external dc power by current-limiting resistance, second input is connected with the signal output pin of external control chip, first output is divided into two-way, pull-up resistor of leading up to is connected with outside second DC power supply, another road is connected with the negative input of amplifier, second output head grounding, the electrode input end of amplifier be connected the second resistance between ground, the electrode input end of amplifier be connected the first resistance between output, second DC power supply is connected filter circuit with between ground, described filter circuit comprises three the unequal filter capacitors of capacitance be connected in parallel, and between each filter capacitor, at least differ an order of magnitude.
The capacitance of described three filter capacitors is respectively 0.01uf, 0.1uf, 1uf.
The resistance of described pull-up resistor is 1 kilo-ohm ~ 10 kilo-ohms, and the resistance of described current-limiting resistance is 50 Europe, Europe ~ 150.
The resistance of described pull-up resistor is 1 kilo-ohm.
Described second DC power supply is 5V, 9V or 12V.
Described second DC power supply is 12V.
Described first DC power supply is 5V.
Compared with prior art, the present invention has following beneficial effect:
Application amplifying circuit and negative-feedback circuit amplify optical coupling isolation circuit output signal and regulate, and effectively enhance power output, and make output more stable.
Adopt optical coupling isolation circuit to make not have between segregate two parts circuit the direct connection of electricity, preventing the interference caused because there being the connection of electricity, ensure that the stability that vehicle mounted power inverter exports.
Adopt three grades of capacitance isolation, effectively can carry out filtering to the interference of different frequency range, ensure that the stability that light-coupled isolation outputs signal.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
Below the technical scheme of invention is described in detail:
As shown in Figure 1, a kind of vehicle power drive circuit, comprise photoelectrical coupler, filter circuit, pull-up resistor, current-limiting resistance, amplifier, feedback circuit, described photoelectrical coupler comprises first input end, second input, first output, second output, described feedback circuit comprises the first resistance and the second resistance, wherein, first input end is connected with external dc power by current-limiting resistance, second input is connected with the signal output pin of external control chip, first output is divided into two-way, pull-up resistor of leading up to is connected with outside second DC power supply, another road is connected with the negative input of amplifier, second output head grounding, the electrode input end of amplifier be connected the second resistance between ground, the electrode input end of amplifier be connected the first resistance between output, second DC power supply is connected filter circuit with between ground, described filter circuit comprises three the unequal filter capacitors of capacitance be connected in parallel, and between each filter capacitor, at least differ an order of magnitude.
The capacitance of described three filter capacitors is respectively 0.01uf, 0.1uf, 1uf.
The resistance of described pull-up resistor is 1 kilo-ohm ~ 10 kilo-ohms, and the resistance of described current-limiting resistance is 50 Europe, Europe ~ 150.
The resistance of described pull-up resistor is 1 kilo-ohm.
Described second DC power supply is 5V, 9V or 12V.
Described second DC power supply is 12V.
Described first DC power supply is 5V.
Specific embodiment one,
A kind of vehicle power drive circuit, comprise photoelectrical coupler Q1, filter circuit, pull-up resistor R2, current-limiting resistance R1, amplifier U2, feedback circuit, described photoelectrical coupler Q1 comprises first input end, second input, first output, second output, described feedback circuit comprises the first resistance R3 and the second resistance R4, wherein, first input end is connected with outside+5V DC power supply by 100 Europe current-limiting resistance R1, second input is connected with the signal output pin of external control chip IC, first output is divided into two-way, 1 kilo-ohm of pull-up resistor R2 of leading up to is connected with outside+12V DC power supply, another road is connected with the negative input of amplifier U2, second output head grounding, + 12V DC power supply is connected filter circuit with between ground, described filter circuit comprises three the unequal filter capacitors of capacitance be connected in parallel, be respectively the first to the 3rd electric capacity, wherein, the capacitance of the first electric capacity C1 is 0.01uf, the capacitance of the second electric capacity C2 is 0.1uf, the capacitance of the 3rd electric capacity C3 is 1uf, an order of magnitude is at least differed between each filter capacitor.
Specific embodiment two,
A kind of vehicle power drive circuit, comprise photoelectrical coupler Q1, filter circuit, pull-up resistor R2, current-limiting resistance R1, amplifier U2, feedback circuit, described photoelectrical coupler Q1 comprises first input end, second input, first output, second output, described feedback circuit comprises the first resistance R3 and the second resistance R4, wherein, first input end is connected with outside+5V DC power supply by 50 Europe current-limiting resistance R1, second input is connected with the signal output pin of external control chip IC, first output is divided into two-way, 10 kilo-ohms of pull-up resistor R2 of leading up to are connected with outside+12V DC power supply, another road is connected with the negative input of amplifier U2, second output head grounding, + 12V DC power supply is connected filter circuit with between ground, described filter circuit comprises three the unequal filter capacitors of capacitance be connected in parallel, be respectively the first to the 3rd electric capacity, wherein, the capacitance of the first electric capacity C1 is 0.01uf, the capacitance of the second electric capacity C2 is 0.1uf, the capacitance of the 3rd electric capacity C3 is 1uf, an order of magnitude is at least differed between each filter capacitor.
Specific embodiment three,
A kind of vehicle power drive circuit, comprise photoelectrical coupler Q1, filter circuit, pull-up resistor R2, current-limiting resistance R1, amplifier U2, feedback circuit, described photoelectrical coupler Q1 comprises first input end, second input, first output, second output, described feedback circuit comprises the first resistance R3 and the second resistance R4, wherein, first input end is connected with outside+5V DC power supply by 150 Europe current-limiting resistance R1, second input is connected with the signal output pin of external control chip IC, first output is divided into two-way, 10 kilo-ohms of pull-up resistor R2 of leading up to are connected with outside+12V DC power supply, another road is connected with the negative input of amplifier U2, second output head grounding, + 12V DC power supply is connected filter circuit with between ground, described filter circuit comprises three the unequal filter capacitors of capacitance be connected in parallel, be respectively the first to the 3rd electric capacity, wherein, the capacitance of the first electric capacity C1 is 0.001uf, the capacitance of the second electric capacity C2 is 0.1uf, the capacitance of the 3rd electric capacity C3 is 10uf, an order of magnitude is at least differed between each filter capacitor.
Specific embodiment four,
A kind of vehicle power drive circuit, comprise photoelectrical coupler Q1, filter circuit, pull-up resistor R2, current-limiting resistance R1, amplifier U2, feedback circuit, described photoelectrical coupler Q1 comprises first input end, second input, first output, second output, described feedback circuit comprises the first resistance R3 and the second resistance R4, wherein, first input end is connected with outside+5V DC power supply by 100 Europe current-limiting resistance R1, second input is connected with the signal output pin of external control chip IC, first output is divided into two-way, 10 kilo-ohms of pull-up resistor R2 of leading up to are connected with outside+12V DC power supply, another road is connected with the negative input of amplifier U2, second output head grounding, + 5V DC power supply is connected filter circuit with between ground, described filter circuit comprises three the unequal filter capacitors of capacitance be connected in parallel, be respectively the first to the 3rd electric capacity, wherein, the capacitance of the first electric capacity C1 is 0.001uf, the capacitance of the second electric capacity C2 is 0.1uf, the capacitance of the 3rd electric capacity C3 is 1uf, an order of magnitude is at least differed between each filter capacitor.
Finally illustrate: above examples of implementation are only unrestricted for illustration of the present invention, although to invention has been detailed description, one of skill in the art is to be understood that, to amendment of the present invention and equivalent replacement, and not departing from the spirit and scope of the present invention, it all should be encompassed within right of the present invention.
Claims (7)
1. a vehicle power drive circuit, it is characterized in that: comprise photoelectrical coupler, filter circuit, pull-up resistor, current-limiting resistance, amplifier, feedback circuit, described photoelectrical coupler comprises first input end, second input, first output, second output, described feedback circuit comprises the first resistance and the second resistance, wherein, first input end is connected with external dc power by current-limiting resistance, second input is connected with the signal output pin of external control chip, first output is divided into two-way, pull-up resistor of leading up to is connected with outside second DC power supply, another road is connected with the negative input of amplifier, second output head grounding, the electrode input end of amplifier be connected the second resistance between ground, the electrode input end of amplifier be connected the first resistance between output, second DC power supply is connected filter circuit with between ground, described filter circuit comprises three the unequal filter capacitors of capacitance be connected in parallel, and between each filter capacitor, at least differ an order of magnitude.
2. vehicle power drive circuit according to claim 1, is characterized in that: the capacitance of described three filter capacitors is respectively 0.01uf, 0.1uf, 1uf.
3. vehicle power drive circuit according to claim 1, is characterized in that: the resistance of described pull-up resistor is 1 kilo-ohm ~ 10 kilo-ohms, and the resistance of described current-limiting resistance is 50 Europe, Europe ~ 150.
4. vehicle power drive circuit according to claim 3, is characterized in that: the resistance of described pull-up resistor is 1 kilo-ohm.
5. vehicle power drive circuit according to claim 1, is characterized in that: described second DC power supply is 5V, 9V or 12V.
6. vehicle power drive circuit road according to claim 5, is characterized in that: described second DC power supply is 12V.
7. vehicle power drive circuit according to claim 1, is characterized in that: described first DC power supply is 5V.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510531083.1A CN105048839A (en) | 2015-08-27 | 2015-08-27 | Vehicle-mounted power supply driving circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510531083.1A CN105048839A (en) | 2015-08-27 | 2015-08-27 | Vehicle-mounted power supply driving circuit |
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| CN105048839A true CN105048839A (en) | 2015-11-11 |
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| CN201510531083.1A Pending CN105048839A (en) | 2015-08-27 | 2015-08-27 | Vehicle-mounted power supply driving circuit |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030117698A1 (en) * | 2001-12-21 | 2003-06-26 | Williams David A. | Gain compensation for optocoupler feedback circuit |
| CN202815064U (en) * | 2012-09-26 | 2013-03-20 | 金海新源电气江苏有限公司 | Sensor for detecting voltage of solar cell assembly |
| US20130168531A1 (en) * | 2012-01-03 | 2013-07-04 | Avago Technologies Ecbu Ip (Singapore) Pte. Ltd. | Optocoupler with Multiple Photodetectors and Improved Feedback Control of LED |
| CN103780234A (en) * | 2014-01-20 | 2014-05-07 | 江西清华泰豪三波电机有限公司 | In-phase synchronous pulse detection circuit |
-
2015
- 2015-08-27 CN CN201510531083.1A patent/CN105048839A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030117698A1 (en) * | 2001-12-21 | 2003-06-26 | Williams David A. | Gain compensation for optocoupler feedback circuit |
| US20130168531A1 (en) * | 2012-01-03 | 2013-07-04 | Avago Technologies Ecbu Ip (Singapore) Pte. Ltd. | Optocoupler with Multiple Photodetectors and Improved Feedback Control of LED |
| CN202815064U (en) * | 2012-09-26 | 2013-03-20 | 金海新源电气江苏有限公司 | Sensor for detecting voltage of solar cell assembly |
| CN103780234A (en) * | 2014-01-20 | 2014-05-07 | 江西清华泰豪三波电机有限公司 | In-phase synchronous pulse detection circuit |
Non-Patent Citations (1)
| Title |
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| 刘青川等: "基于DSP的无速度传感器直接转矩控制系统设计", 《电子质量》 * |
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