CN114039479A - 270V direct current ground power supply voltage ripple protection circuit - Google Patents
270V direct current ground power supply voltage ripple protection circuit Download PDFInfo
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- CN114039479A CN114039479A CN202111336853.9A CN202111336853A CN114039479A CN 114039479 A CN114039479 A CN 114039479A CN 202111336853 A CN202111336853 A CN 202111336853A CN 114039479 A CN114039479 A CN 114039479A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
- H02M1/15—Arrangements for reducing ripples from dc input or output using active elements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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Abstract
The invention relates to a 270V direct-current ground power supply voltage ripple protection circuit. The circuit can detect the pulsating voltage of the 270V direct current power supply, and when the pulsating voltage exceeds a set value, the circuit outputs a protection control signal. The circuit consists of a pulsating voltage detection circuit, a comparison circuit and an isolation circuit, wherein the pulsating voltage detection circuit adopts a resistance-capacitance method to realize detection. The circuit has the advantages of lightning protection design and over-tolerance protection design, can ensure that the circuit meets the 3-level lightning protection requirement, and can realize the protection of circuit components when the pulsating voltage is overlarge.
Description
Technical Field
The invention relates to the field of aircraft ground power quality monitoring and pulsating voltage detection. In particular to a 270V direct current ground power supply voltage ripple protection circuit.
Background
The ripple voltage is also called ripple voltage, which is generated when ac voltage is rectified into dc voltage. The ripple of the rectified dc voltage is proportional to the first power of the load current and inversely proportional to the power frequency and the capacitance of the capacitors of each stage. One of the measures often taken to reduce ripple voltage is to increase the frequency of the rectified power supply. Since the ripple voltage is superimposed on the dc high voltage, measurement of the ripple voltage becomes difficult when the dc voltage is high.
At present, the main application scene of the pulse voltage detection is the output quality detection of high-voltage direct-current equipment, and the pulse voltage is generally extracted by adopting a front-end circuit and then measured by using equipment such as an oscilloscope and the like, so that the pulse voltage detection is realized. Common front-end circuits include voltage divider measurement, ripple current rectification, and capacitive resistance methods, among others.
The airplane ground power supply quality monitoring equipment needs to be simple and reliable, and the oscilloscope measurement cannot meet the use scene requirements.
Disclosure of Invention
In view of the above technical problems, an object of the present invention is to provide a circuit suitable for detecting and protecting the pulsating voltage of the ground power supply of an aircraft, so as to monitor the quality of the 270V dc power supply of the aircraft.
The technical scheme of the invention is as follows:
A270V direct current ground power supply voltage ripple protection circuit comprises a ripple voltage detection circuit, a comparison circuit and an isolation circuit, wherein the ripple voltage detection circuit isolates ripple voltage from 270V direct current voltage to obtain a ripple voltage component, the comparison circuit compares the ripple voltage component with a voltage threshold, and signals output by the comparison circuit are electrically isolated by the isolation circuit.
The pulse voltage detection circuit is characterized by comprising a blocking capacitor C112, voltage dividing resistors R220 and R225, a voltage regulator tube D8, a diode D9 and an operational amplifier M10; the capacitor C112 is connected with one end of the resistor R220 in series, the other end of the resistor R220 is connected with the forward input end of the operational amplifier M10, the forward input end of the operational amplifier M10 is also connected with one end of the resistor R225, the reverse end of the voltage regulator tube D8 and the reverse end of the diode D9, the other end of the resistor R225, the forward end of the voltage regulator tube D8 and the forward end of the diode D9 are grounded, the resistors R220 and R225 divide the pulse voltage value and then input the pulse voltage value into the forward input end of the operational amplifier M10, and the reverse input end of the operational amplifier M10 is connected with the output end.
The pulse voltage detection circuit is characterized in that the comparison circuit is composed of a comparator U35, resistors R217, R292, R294, R235, R231 and R232, an output end of an operational amplifier M10 of the pulse voltage detection circuit is connected with a positive input end of the comparator U35 through the resistor R217, one end of the resistor R294 is connected with one end of the resistor R235 in series, the other end of the resistor R235 is connected with a 5V power supply, the other end of the resistor R294 is connected with the ground, a connecting end of the resistor R294 and the resistor R235 is connected with one end of the resistor R231, the other end of the resistor R231 is connected with a reverse input end of the comparator U35 and one end of the resistor R232, the other end of the resistor R232 is connected with an output end of the comparator U35, and an output end of the comparator U35 is connected with the 5V power supply through the resistor R292.
The isolation circuit is characterized by comprising a magnetic coupler U11, wherein the output end of a comparator U35 is connected with the input end of a magnetic coupler U11, and the output end of a magnetic coupler U11 outputs a pulsating voltage protection signal.
The 270V direct current voltage control circuit is characterized in that a 270V signal enters the circuit from a capacitor C112, a 270V direct current component is removed after the 270V signal passes through the capacitor C112, and only a pulsating voltage component is left.
The pulse voltage is divided by resistors R220 and R225.
The method is characterized in that after the reduced pulsating voltage signal passes through a diode D9, negative voltage is removed, only positive voltage is kept, the amplitude of the pulsating voltage signal is limited to 5V by an operational amplifier M10 voltage regulator tube D8, and the operational amplifier M10 is prevented from being damaged due to overlarge voltage; the voltage regulator tube D8 and the resistors R220 and R225 form a lightning protection circuit, so that the circuit can bear 600V lightning stroke without damage.
The voltage divider is characterized in that the resistors R294, R235, R231 and R232 form a voltage dividing and feedback circuit, and the resistors R294, R235 and R231 divide the 5V power supply voltage to generate a voltage threshold; the resistor R232 forms a feedback circuit to prevent the jitter of the output signal when the pulsating voltage signal is close to the voltage threshold.
The operational amplifier is characterized in that after a ripple voltage signal and a voltage threshold value output by the operational amplifier M10 enter the comparator U35, when the amplitude of the ripple voltage signal is larger than the voltage threshold value, the comparator U35 outputs a high level, and when the amplitude of the ripple voltage signal is smaller than the voltage threshold value, the comparator U35 outputs a low level.
The high-low level signal output by the comparator U35 enters the magnetic coupling U11, and after isolation, a pulsating voltage protection signal which is consistent with the output of the comparator U35 is output by the output end of the magnetic coupling U11.
The invention has the beneficial effects that:
the invention is suitable for detecting and protecting the pulsating voltage of the 270V ground power supply of the airplane, can realize monitoring and protecting the output quality of the 270V ground power supply of the airplane, and has simple and reliable circuit.
Drawings
FIG. 1 is a schematic diagram of a ripple voltage detection circuit
FIG. 2 is a schematic diagram of a comparison circuit and an isolation circuit
Detailed Description
The connection structure of the present invention will be described in detail with reference to the accompanying drawings and examples.
The invention collects 270V ground power supply voltage, isolates the pulsating voltage from 270V voltage by the pulsating voltage detection circuit, and compares the regulated pulsating voltage with a set value by the comparison circuit, when the amplitude of the pulsating voltage is larger than the set value, the comparison circuit outputs a protection signal, and the protection signal enters a post-stage circuit after passing through the isolation circuit.
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic diagram of a ripple voltage detection circuit of a 270V DC ground power supply voltage ripple protection circuit, FIG. 2 is a schematic diagram of a comparison circuit and an isolation circuit of the 270V DC ground power supply voltage ripple protection circuit,
as shown in fig. 1, the pulsating voltage detection circuit is composed of a blocking capacitor C112, voltage dividing resistors R220 and R225, a voltage regulator tube D8, a diode D9 and an operational amplifier M10; the capacitor C112 is connected with one end of the resistor R220 in series, the other end of the resistor R220 is connected with the forward input end of the operational amplifier M10, the forward input end of the operational amplifier M10 is also connected with one end of the resistor R225, the reverse end of the voltage regulator tube D8 and the reverse end of the diode D9, the other end of the resistor R225, the forward end of the voltage regulator tube D8 and the forward end of the diode D9 are grounded, the resistors R220 and R225 divide the pulse voltage value and then input the pulse voltage value into the forward input end of the operational amplifier M10, and the reverse input end of the operational amplifier M10 is connected with the output end.
The 270V signal enters the circuit through the capacitor C112, and the 270V direct current component is removed after passing through the capacitor C112, and only the pulsating voltage component is left. The pulsating voltage is divided by resistors R220 and R225, and the amplitude is reduced to one half of the original value. The reduced pulsating voltage signal passes through a diode D9, negative voltage is removed, only positive voltage is kept, the amplitude of the pulsating voltage signal is limited to 5V by the operational amplifier M10 voltage regulator tube D8, and the operational amplifier M10 is prevented from being damaged due to overlarge voltage. Meanwhile, the voltage regulator tube D8 and the resistors R220 and R225 form a lightning protection circuit, so that the circuit can bear 600V lightning stroke without being damaged. The pulsating voltage signal enters a comparison circuit after passing through a voltage follower circuit consisting of an operational amplifier M10.
As shown in fig. 2, the comparator circuit is composed of a comparator U35, resistors R217, R292, R294, R235, R231, and R232, an output terminal of the ripple voltage detection circuit operational amplifier M10 is connected to a forward input terminal of the comparator U35 through the resistor R217, one end of the resistor R294 is connected in series with one end of the resistor R235, the other end of the resistor R235 is connected to a 5V power supply, the other end of the resistor R294 is connected to ground, a connection terminal of the resistor R294 and the resistor R235 is connected to one end of the resistor R231, the other end of the resistor R231 is connected to a reverse input terminal of the comparator U35 and one end of the resistor R232, the other end of the resistor R232 is connected to an output terminal of the comparator U35, and an output terminal of the comparator U35 is connected to the 5V power supply through the resistor R292.
The ripple voltage signal output by the operational amplifier M10 enters a comparator U35 through a current limiting resistor R217, a voltage division and feedback circuit is formed by resistors R294, R235, R231 and R232, and 5V power supply voltage is divided by the resistors R294, R235 and R231 to generate a voltage threshold; the resistor R232 forms a feedback circuit to prevent the jitter of the output signal when the pulsating voltage signal is close to the voltage threshold. After the ripple voltage signal and the voltage threshold outputted by the operational amplifier M10 enter the comparator U35, when the amplitude of the ripple voltage signal is greater than the voltage threshold, the comparator U35 outputs a high level, and when the amplitude of the ripple voltage signal is less than the voltage threshold, the comparator U35 outputs a low level.
The isolation circuit comprises a magnetic coupler U11, the output end of a comparator U35 is connected with the input end of a magnetic coupler U11, and the output end of a magnetic coupler U11 outputs a ripple voltage protection signal. The high-low level signal output by the comparator U35 enters the magnetic coupling U11, and after isolation, the output end of the magnetic coupling U11 outputs a pulsating voltage protection signal consistent with the output of the comparator U35, so that the influence of pulsating voltage on the back-end circuit is avoided.
Claims (10)
1. A270V direct current ground power supply voltage ripple protection circuit comprises a ripple voltage detection circuit, a comparison circuit and an isolation circuit, wherein the ripple voltage detection circuit isolates ripple voltage from 270V direct current voltage to obtain a ripple voltage component, the comparison circuit compares the ripple voltage component with a voltage threshold, and signals output by the comparison circuit are electrically isolated by the isolation circuit.
2. The 270V dc ground supply voltage ripple protection circuit of claim 1, wherein the ripple voltage detection circuit is comprised of a dc blocking capacitor C112, voltage dividing resistors R220, R225, a voltage regulator tube D8, a diode D9, and an operational amplifier M10; the capacitor C112 is connected with one end of the resistor R220 in series, the other end of the resistor R220 is connected with the forward input end of the operational amplifier M10, the forward input end of the operational amplifier M10 is also connected with one end of the resistor R225, the reverse end of the voltage regulator tube D8 and the reverse end of the diode D9, the other end of the resistor R225, the forward end of the voltage regulator tube D8 and the forward end of the diode D9 are grounded, the resistors R220 and R225 divide the pulse voltage value and then input the pulse voltage value into the forward input end of the operational amplifier M10, and the reverse input end of the operational amplifier M10 is connected with the output end.
3. The 270V dc ground supply voltage ripple protection circuit of claim 2, wherein the comparator circuit comprises a comparator U35, resistors R217, R292, R294, R235, R231, and R232, the output terminal of the ripple voltage detection circuit operational amplifier M10 is connected to the positive input terminal of the comparator U35 through the resistor R217, one end of the resistor R294 is connected in series with one end of the resistor R235, the other end of the resistor R235 is connected to the positive 5V supply, the other end of the resistor R294 is connected to ground, the connection end of the resistor R294 and the resistor R235 is connected to one end of the resistor R231, the other end of the resistor R231 is connected to the negative input terminal of the comparator U35 and one end of the resistor R232, the other end of the resistor R232 is connected to the output terminal of the comparator U35, and the output terminal of the comparator U35 is connected to the positive 5V supply through the resistor R292.
4. The protection circuit of claim 3, wherein the isolation circuit comprises a magnetic coupler U11, the output terminal of the comparator U35 is connected to the input terminal of the magnetic coupler U11, and the output terminal of the magnetic coupler U11 outputs the ripple voltage protection signal.
5. The 270V DC ground supply voltage ripple protection circuit of claim 4, wherein the 270V signal enters the circuit through a capacitor C112, and the 270V DC component is removed after passing through the capacitor C112, leaving only the ripple voltage component.
6. The 270V dc ground supply voltage ripple protection circuit of claim 5, wherein the ripple voltage is divided by resistors R220 and R225.
7. The 270V DC ground supply voltage ripple protection circuit of claim 6, wherein the reduced ripple voltage signal passes through a diode D9, the negative voltage is removed, only the positive voltage is retained, so that the amplitude of the ripple voltage signal is limited to 5V by an operational amplifier M10 voltage regulator tube D8, and the operational amplifier M10 voltage is prevented from being damaged due to too large voltage; the voltage regulator tube D8 and the resistors R220 and R225 form a lightning protection circuit, so that the circuit can bear 600V lightning stroke without damage.
8. The 270V dc ground supply voltage ripple protection circuit of claim 7, wherein the resistors R294, R235, R231, and R232 form a voltage divider and feedback circuit, and the resistors R294, R235, and R231 divide the 5V supply voltage to generate a voltage threshold; the resistor R232 forms a feedback circuit to prevent the jitter of the output signal when the pulsating voltage signal is close to the voltage threshold.
9. The 270V dc ground supply voltage ripple protection circuit of claim 8, wherein after the ripple voltage signal and the voltage threshold outputted from the operational amplifier M10 enter the comparator U35, the comparator U35 outputs a high level when the ripple voltage signal amplitude is greater than the voltage threshold, and the comparator U35 outputs a low level when the ripple voltage signal amplitude is less than the voltage threshold.
10. The protection circuit of claim 9, wherein the high/low signal from the comparator U35 enters the magnetic coupler U11, and after isolation, the ripple voltage protection signal is outputted from the output terminal of the magnetic coupler U11 in accordance with the output of the comparator U35.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111336853.9A CN114039479A (en) | 2021-11-12 | 2021-11-12 | 270V direct current ground power supply voltage ripple protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111336853.9A CN114039479A (en) | 2021-11-12 | 2021-11-12 | 270V direct current ground power supply voltage ripple protection circuit |
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| CN114039479A true CN114039479A (en) | 2022-02-11 |
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| CN202111336853.9A Pending CN114039479A (en) | 2021-11-12 | 2021-11-12 | 270V direct current ground power supply voltage ripple protection circuit |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6853565B1 (en) * | 2003-05-23 | 2005-02-08 | Linear Technology Corporation | Voltage overshoot reduction circuits |
| US20110032001A1 (en) * | 2008-04-18 | 2011-02-10 | Ryuta Hasegawa | Temperature detection circuit |
| CN204205552U (en) * | 2014-11-18 | 2015-03-11 | 深圳市京泉华科技股份有限公司 | The under-voltage over-voltage detection circuit of a kind of AC |
| CN107911037A (en) * | 2017-12-11 | 2018-04-13 | 成都互聚科技有限公司 | A kind of strong switching power supply of job stability |
| CN110850146A (en) * | 2019-12-01 | 2020-02-28 | 贵阳航空电机有限公司 | Output pulsating voltage acquisition circuit of voltage transformation rectifier |
| CN112858771A (en) * | 2021-04-13 | 2021-05-28 | 中国航空工业集团公司北京长城计量测试技术研究所 | Distortion and pulsation signal testing method for airplane direct current 270V power supply system |
-
2021
- 2021-11-12 CN CN202111336853.9A patent/CN114039479A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6853565B1 (en) * | 2003-05-23 | 2005-02-08 | Linear Technology Corporation | Voltage overshoot reduction circuits |
| US20110032001A1 (en) * | 2008-04-18 | 2011-02-10 | Ryuta Hasegawa | Temperature detection circuit |
| CN204205552U (en) * | 2014-11-18 | 2015-03-11 | 深圳市京泉华科技股份有限公司 | The under-voltage over-voltage detection circuit of a kind of AC |
| CN107911037A (en) * | 2017-12-11 | 2018-04-13 | 成都互聚科技有限公司 | A kind of strong switching power supply of job stability |
| CN110850146A (en) * | 2019-12-01 | 2020-02-28 | 贵阳航空电机有限公司 | Output pulsating voltage acquisition circuit of voltage transformation rectifier |
| CN112858771A (en) * | 2021-04-13 | 2021-05-28 | 中国航空工业集团公司北京长城计量测试技术研究所 | Distortion and pulsation signal testing method for airplane direct current 270V power supply system |
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