CN201368896Y - Zero-crossing detection circuit - Google Patents
Zero-crossing detection circuit Download PDFInfo
- Publication number
- CN201368896Y CN201368896Y CNU2009200230421U CN200920023042U CN201368896Y CN 201368896 Y CN201368896 Y CN 201368896Y CN U2009200230421 U CNU2009200230421 U CN U2009200230421U CN 200920023042 U CN200920023042 U CN 200920023042U CN 201368896 Y CN201368896 Y CN 201368896Y
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- voltage comparator
- zero
- input end
- crossing detection
- detection circuit
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The utility model discloses a zero-crossing detection circuit, which comprises a voltage comparator and a power supply for supplying power to the voltage comparator. Two input ends of the voltage comparator are connected with two detection ends, and a filter circuit and a voltage stabilizing circuit are arranged on connecting lines between the two input ends of the voltage comparator and the two detection ends. The zero-crossing detection circuit uses the voltage comparator, thereby having the advantages of high accuracy, low cost and good practicality. The adopted filter circuit and the voltage stabilizing circuit can provide comprehensive protection, thereby being in line with the actual demands.
Description
Technical field
The utility model relates to a kind of zero-crossing detection circuit, the zero-crossing detection circuit that is used for power factor correction that uses in convertible frequency air-conditioner specifically.
Background technology
In convertible frequency air-conditioner control,, need to use circuit of power factor correction that it is proofreaied and correct in order to improve the power factor of operation of air conditioner.In the Power Factor Correction Control scheme, detecting the zero crossing moment of power supply, is very important techniques data, according to detected power supply zero crossing constantly, the break-make of gauge tap pipe, thus reach the purpose that improves power factor.If detect less than the zero crossing moment or detect zero crossing and occur mistake constantly, can cause the misoperation of switching tube, not only do not reach the purpose that improves power factor, and might be owing to misoperation burns out switching tube, therefore the zero crossing of correct detection power supply is constantly and how wrongheaded crossover point signal is most important.
The utility model content
The purpose of this utility model provides a kind of reliable zero-crossing detection circuit, and this circuit is simple and reliable, and accuracy height and cost are low.
The utility model for achieving the above object, the technical solution of employing is:
A kind of zero-crossing detection circuit, it comprises voltage comparator and is used to the power supply of voltage comparator power supply, two input ends of voltage comparator connect two test sides, and the line of two input ends of described voltage comparator and two test sides is provided with filtering circuit and mu balanced circuit.
Above-mentioned filtering circuit has three filter capacitors, three one of filter capacitors are connected between the first input end and ground of voltage comparator, between second input end and ground that is connected on voltage comparator, last is connected between the first input end and second input end of voltage comparator again.
Above-mentioned mu balanced circuit has four diodes, four diodes, model is identical in twos, after getting two different diode series aiding connections, oppositely be connected between the power supply and ground into the voltage comparator power supply, constitute two identical series diodes this moment, and wherein the common port of one two diode is connected with the first input end of voltage comparator, and the common port of another two diode is connected with second input end of voltage comparator.
Above-mentioned voltage comparator adopts the LM393 chip, and first input end is a pin two, and second input end is a pin 3, and the output terminal of first, second input end correspondence connects a resistance.
Near two diodes of the power supply of powering, adopt hypervelocity fast recovery diode KDS184 chip in the above-mentioned mu balanced circuit for voltage comparator; Two diodes near earth terminal adopt two stabilivolt MMBZ5232B.
Also be provided with the pure resistance circuit that is used to reduce the voltage comparator input voltage on the line of two input ends of above-mentioned voltage comparator and two test sides.
The beneficial effects of the utility model: this kind zero-crossing detection circuit, the working voltage comparer, accuracy height and cost are low, and practicality is good.Filtering circuit that is adopted and mu balanced circuit protection are comprehensive, realistic demand.
Description of drawings
Fig. 1 is the structural representation of zero-crossing detection circuit.
Below in conjunction with accompanying drawing the utility model is elaborated:
Embodiment
In conjunction with Fig. 1, a kind of zero-crossing detection circuit, it comprise voltage comparator 101 and be used to voltage comparator 101 power supplies+5 volts of power supplys, voltage comparator 101 adopts the LM393 chip, first input end is pin 3 joint detection end A, second input end is pin two joint detection end B, and the output terminal of first, second input end correspondence (pin one) connects a resistance.The line of 101 two input ends of described voltage comparator and two test sides is provided with filtering circuit and mu balanced circuit.
Filtering circuit has three filter capacitors, three first 201 of filter capacitors are connected between the first input end and ground of voltage comparator 101, be connected on for one 202 between second input end and ground of voltage comparator 101, last 203 is connected between the first input end and second input end of voltage comparator 101 again.
Mu balanced circuit has four diodes, four diodes, model is identical in twos, after getting two different diode series aiding connections, oppositely be connected between the power supply and ground into voltage comparator 101 power supplies, constitute two identical series diodes this moment, and wherein the common port of one two diode is connected with the first input end of voltage comparator 101, and the common port of another two diode is connected with second input end of voltage comparator 101.Near two diodes that are the power supply of voltage comparator 101 power supplies, adopt hypervelocity fast recovery diode KDS184 chip 301 in the mu balanced circuit; Two diodes near earth terminal adopt two stabilivolts 302, and model is MMBZ5232B.
Also be provided with the pure resistance circuit that is used to reduce the voltage comparator input voltage on the line of 101 two input ends of voltage comparator and two test sides.
Principle of work according to circuit connection and voltage comparator can draw, and when the voltage of test side A was higher than the voltage of test side B, output terminal (pin one) was output as high level; When the voltage of test side A was lower than the voltage of test side B, output terminal (pin one) was output as low level.When therefore the transient voltage of test side A and B was positive number, output terminal (pin one) was output as high level; When the transient voltage of test side A and B was negative, output terminal (pin one) was output as low level.
Utilize the numerical value of output terminal (pin one) output voltage, tell about in convertible frequency air-conditioner, how to utilize this kind zero-crossing detection circuit.
1, the transformation period of the high and low level of monitoring ZCP_A, if high and low level signal did not have null value in 11ms, expression test side A and B electric voltage exception, will close circuit of power factor correction this moment, but can keep compressor to continue operation.
2, the transformation period of the high and low level of monitoring ZCP_A, if high and low level signal surpassed in the time of regular power cycle (50/60Hz) ± 5% null value was arranged, expression test side A and B electric voltage exception, will close circuit of power factor correction this moment, but can keep compressor to continue operation.
3, after circuit of power factor correction is closed, regular power cycle is continuously accurately by 25 null values, starting power factor correcting circuit once more.
4, the supply frequency of test side A and B is from 50 to 60 hz, or the situation from 60Hz to the 50Hz conversion:
If compressor is a stationary state, carry out the startup of compressor and circuit of power factor correction from the supply frequency state of change.
If compressor is in running status, stop circuit of power factor correction immediately.Compressor stops till restarting, and circuit of power factor correction is kept halted state.
5, the overlapping situation of noise spike is arranged in the high and low level signal of ZCP_A:
If the situation of signal noise pulse overlap is arranged, for the signal of cycle below 2ms, ignore this signal, still judge according to the former time cycle.
Certainly; above-mentioned explanation is not to be to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present utility model also should belong to protection domain of the present utility model.
Claims (6)
1, a kind of zero-crossing detection circuit, it is characterized in that: described zero-crossing detection circuit comprises voltage comparator and is used to the power supply of voltage comparator power supply, two input ends of voltage comparator connect two test sides, and the line of two input ends of described voltage comparator and two test sides is provided with filtering circuit and mu balanced circuit.
2, a kind of zero-crossing detection circuit according to claim 1, it is characterized in that: described filtering circuit has three filter capacitors, three one of filter capacitors are connected between the first input end and ground of voltage comparator, between second input end and ground that is connected on voltage comparator, last is connected between the first input end and second input end of voltage comparator again.
3, a kind of zero-crossing detection circuit according to claim 1 and 2, it is characterized in that: described mu balanced circuit has four diodes, four diodes, model is identical in twos, after getting two different diode series aiding connections, oppositely be connected between the power supply and ground into the voltage comparator power supply, constitute two identical series diodes this moment, wherein the common port of one two diode is connected with the first input end of voltage comparator, and the common port of another two diode is connected with second input end of voltage comparator.
4, a kind of zero-crossing detection circuit according to claim 3 is characterized in that: described voltage comparator adopts the LM393 chip, and first input end is a pin two, and second input end is a pin 3, and the output terminal of first, second input end correspondence connects a resistance.
5, a kind of zero-crossing detection circuit according to claim 3 is characterized in that: near two diodes of the power supply of powering for voltage comparator, adopt hypervelocity fast recovery diode KDS184 chip in the described mu balanced circuit; Two diodes near earth terminal adopt two stabilivolt MMBZ5232B.
6, a kind of zero-crossing detection circuit according to claim 1 is characterized in that: also be provided with the pure resistance circuit that is used to reduce the voltage comparator input voltage on the line of two input ends of described voltage comparator and two test sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200230421U CN201368896Y (en) | 2009-03-06 | 2009-03-06 | Zero-crossing detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200230421U CN201368896Y (en) | 2009-03-06 | 2009-03-06 | Zero-crossing detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201368896Y true CN201368896Y (en) | 2009-12-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2009200230421U Expired - Lifetime CN201368896Y (en) | 2009-03-06 | 2009-03-06 | Zero-crossing detection circuit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101820231A (en) * | 2010-04-15 | 2010-09-01 | 浙江大学 | Current zero-crossing detection and dead zone compensation method used for frequency converter |
| CN102288811A (en) * | 2010-05-12 | 2011-12-21 | 吉歌网络有限公司 | Signal level crossing detector circuit |
| CN102608396A (en) * | 2012-03-01 | 2012-07-25 | 浙江大学 | Current state judgment and dead-zone compensating method of frequency converter |
| CN102955066A (en) * | 2011-08-25 | 2013-03-06 | 阿斯科动力科技公司 | Power analysis module for monitoring electrical power source |
| US9063176B2 (en) | 2010-05-12 | 2015-06-23 | Broadcom Corporation | Signal level crossing detector circuit |
| CN105092948A (en) * | 2015-08-25 | 2015-11-25 | 南京工程学院 | High-precision alternating-current signal zero crossing detection device and method |
-
2009
- 2009-03-06 CN CNU2009200230421U patent/CN201368896Y/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101820231A (en) * | 2010-04-15 | 2010-09-01 | 浙江大学 | Current zero-crossing detection and dead zone compensation method used for frequency converter |
| CN101820231B (en) * | 2010-04-15 | 2012-06-06 | 浙江大学 | Current zero-crossing detection and dead zone compensation method used for frequency converter |
| CN102288811A (en) * | 2010-05-12 | 2011-12-21 | 吉歌网络有限公司 | Signal level crossing detector circuit |
| US9063176B2 (en) | 2010-05-12 | 2015-06-23 | Broadcom Corporation | Signal level crossing detector circuit |
| TWI513192B (en) * | 2010-05-12 | 2015-12-11 | Gigle Networks Ltd | Signal level crossing detector circuit |
| CN102955066A (en) * | 2011-08-25 | 2013-03-06 | 阿斯科动力科技公司 | Power analysis module for monitoring electrical power source |
| CN102955066B (en) * | 2011-08-25 | 2015-07-22 | 阿斯科动力科技公司 | Power analysis module for monitoring electrical power source |
| US9250274B2 (en) | 2011-08-25 | 2016-02-02 | Asco Power Technologies, L.P. | Power analysis module for monitoring an electrical power source |
| CN102608396A (en) * | 2012-03-01 | 2012-07-25 | 浙江大学 | Current state judgment and dead-zone compensating method of frequency converter |
| CN102608396B (en) * | 2012-03-01 | 2014-04-16 | 浙江大学 | Current state judgment and dead-zone compensating method of frequency converter |
| CN105092948A (en) * | 2015-08-25 | 2015-11-25 | 南京工程学院 | High-precision alternating-current signal zero crossing detection device and method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20091223 |
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| CX01 | Expiry of patent term |