CN201477152U - Alternating current full wave zero-cross checking device - Google Patents
Alternating current full wave zero-cross checking device Download PDFInfo
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- CN201477152U CN201477152U CN2009201759358U CN200920175935U CN201477152U CN 201477152 U CN201477152 U CN 201477152U CN 2009201759358 U CN2009201759358 U CN 2009201759358U CN 200920175935 U CN200920175935 U CN 200920175935U CN 201477152 U CN201477152 U CN 201477152U
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Abstract
An alternating current full wave zero-cross checking device belongs to the technical field of checking devices. The device comprises a transformer, a full wave rectification bridge circuit and an operation amplifier which are connected with the transformer, the operation amplifier is two stages, a reverse input end of the first stage operation amplifier is connected with the full wave rectification bridge circuit, an output end is connected with a RC low-pass filtration circuit, the output end of the RC low-pass filtration circuit is connected with the reverse input end of the second-stage operation amplifier, and the output end of the second-stage operation amplifier generates zero-cross pulse signals which are not affected by high frequency and can provide accurate benchmark for the control of the silicon controlled flow angle. The device adopts the two-stage operation amplifier, the RC low-pass filtration circuit is increased between two-stage operation amplifiers, the checking device has the beneficial effects that the design is simple, the performance is reliable, and the versatility is strong. The checking device can effectively filter high frequency interference in the circuit, and can finally output stable and reliable zero-cross pulse signals for providing accurate benchmark for the control of the silicon controlled flow angle in subsequent circuits.
Description
Technical field
The utility model belongs to the pick-up unit technical field, specifically a kind of alternating current all-wave zero crossing detection device of controlling thyristor operating angle.
Background technology
In the various Control Systems of Microcomputer of carrying out silicon controlled power modulation control, need the control thyristor operating angle, and the control of conduction angle needs zero-crossing of alternating current as benchmark.The effect of zero passage detection can be understood as a standard to master chip is provided, and the starting point of this standard is a no-voltage, and the size of thyristor operating angle is exactly according to this standard.The design proposal that the zero crossing detection device of existing control thyristor operating angle is taked is: input signal produces commutating pulse by transformer, rectifier bridge, utilizes operational amplifier to produce zero-crossing pulse then.The shortcoming of this design proposal be reliability low, be subject to disturb, can't discern the high frequency burr that is produced by the objective environment factor and disturb, thus the zero-crossing pulse of output error.
The content of utility model
The purpose of this utility model be solve the zero crossing detection device reliability of existing control thyristor operating angle low, be subject to disturb and effectively filtering disturb so that the problem of output error zero-crossing pulse by the high frequency burr that objective factor produced, provide a kind of filtering effectively to disturb by the high frequency burr that objective factor produced, final output is stablized, reliable positive polarity zero-crossing pulse, and the alternating current all-wave zero crossing detection device of accurate benchmark is provided for the control of thyristor operating angle.
Solve the problems of the technologies described above by the following technical solutions: a kind of alternating current all-wave zero crossing detection device, full-wave rectification bridge circuit and operational amplifier that this device comprises transformer, is connected with transformer, described operational amplifier is a two-stage, the inverting input of first order operational amplifier is connected with the full-wave rectification bridge circuit, its output terminal is connected with the RC low-pass filter circuit, the output terminal of RC low-pass filter circuit is connected with the inverting input of second level operational amplifier, the output terminal output zero passage detection pulse signal of second level operational amplifier.
Adopt technique scheme, compared with prior art, this device has adopted two-stage calculation amplifier, and between two stage amplifer, increased the RC low-pass filter circuit, can disturb by filtering high frequency burr, at the zero crossing of supply voltage, stable, the reliable positive polarity zero-crossing pulse signal of output.Its beneficial effect is: design is succinct, dependable performance, highly versatile.The high frequency interference that exists in the filtering circuit effectively, final output is stable, zero-crossing pulse signal reliably, for the control of thyristor operating angle in the subsequent conditioning circuit provides benchmark accurately.
Description of drawings
Fig. 1 is a theory diagram of the present utility model.
Fig. 2 is circuit theory diagrams of the present utility model.
Embodiment
The utility model will be further described below in conjunction with accompanying drawing.
See Fig. 1, present embodiment is a kind of alternating current all-wave zero crossing detection device, constitute by transformer and two-stage calculation amplifier, transformer is connected with the full-wave rectification bridge circuit, the inverting input of first order operational amplifier is connected with the full-wave rectification bridge circuit, its output terminal is connected with the RC filtering circuit, the output terminal of RC filtering circuit is connected with the inverting input of second level operational amplifier, the output terminal of second level operational amplifier produce be not subjected to high frequency interference, for thyristor operating angle control provides the zero-crossing pulse signal of accurate benchmark, its concrete syndeton is seen Fig. 2.
Resistance R 1, R2 and D1 (light emitting diode) and D2 (diode) have formed a power supply status display circuit in Fig. 2, and D1 lights during normal power supply; D1 extinguishes during outage.The 220V alternating voltage is received on voltage dependent resistor (VDR) R1 and the filter capacitor C1 by F1 (fuse), and voltage dependent resistor (VDR) R1 can prevent that alternating voltage is excessive.Receive transformer T1 then, T1 output AC 15V voltage.This voltage carries out full-wave rectification through rectifier bridge (D3～D6 forms), and the full-wave rectification pulse of output is delivered to limiter diode D7 through resistance R 4, utilizes first order amplifier AMP1 can produce elementary zero-crossing pulse signal.Here resistance R 3 is bleeder resistances, and capacitor C 2 is used for improving the antijamming capability of circuit, and+5V power supply is given threshold voltage of first order operational amplifier A MP1 normal phase input end after resistance R 5, R6 dividing potential drop.
The elementary zero-crossing pulse signal of first order operational amplifier A MP1 output is easy to be subjected to high frequency interference, so can not directly be used for controlling the silicon controlled conduction angle.Therefore the output terminal at AMP1 has increased the low-pass filter circuit that is made of resistance R 7 and capacitor C 3, and so effectively filtering high frequency burr disturbs.
Filtering the signal after the high frequency interference deliver to second level operational amplifier A MP2 ,+5V power supply is given threshold voltage of second level amplifier AMP2 normal phase input end after resistance R 8, R9 dividing potential drop.The zero-crossing pulse signal that produces of second level operational amplifier A MP2 output terminal is very stable, reliable like this, for the control of thyristor operating angle provides benchmark very accurately.Principle of work of the present utility model:
Input signal produces the full-wave rectification pulse by transformer, rectifier bridge, delivers to the inverting input of first order operational amplifier through resistance and limiter diode, and power supply is given threshold voltage of normal phase input end of this amplifier behind two electric resistance partial pressures.First order operational amplifier output terminal will produce elementary zero-crossing pulse like this, and this pulse signal is easy to be subjected to high frequency interference, so can not directly be used for controlling the silicon controlled conduction angle.Elementary zero-crossing pulse signal is delivered to the inverting input of second level amplifier through the RC filtering circuit, power supply is given threshold voltage of normal phase input end of this amplifier behind two electric resistance partial pressures, the RC filtering circuit here is a low-pass filter circuit, filtering high-frequency signal effectively, so the zero-crossing pulse signal that second level amplifier output terminal produces is very stable, reliable, and benchmark very accurately can be provided for the control of thyristor operating angle.
This device can be applicable in the electromagnetic high-frequency sieve control field.Sieving machine is the visual plant in the coal preparation technique, electromagnetic high-frequency exciting sieve is a kind of novel compass screen surface vibration screening machinery, have that multiple spot control, overall package, compass screen surface oscillation intensity are big, the easy advantage such as adjustments in inclination angle, be mainly used in dried, the wet sieving of fine and the classification and the dehydration of material.In electromagnetic high-frequency sieve control circuit, the average current of magnetizing coil can be realized by the control thyristor operating angle, and control silicon controlled conduction angle can use this device.
Claims (1)
1. alternating current all-wave zero crossing detection device, full-wave rectification bridge circuit and operational amplifier that this device comprises transformer, is connected with transformer, it is characterized in that, described operational amplifier is a two-stage, the inverting input of first order operational amplifier is connected with the full-wave rectification bridge circuit, its output terminal is connected with the RC low-pass filter circuit, and the output terminal of RC low-pass filter circuit is connected with the inverting input of second level operational amplifier, the output terminal output zero passage detection pulse signal of second level operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201759358U CN201477152U (en) | 2009-08-28 | 2009-08-28 | Alternating current full wave zero-cross checking device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201759358U CN201477152U (en) | 2009-08-28 | 2009-08-28 | Alternating current full wave zero-cross checking device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201477152U true CN201477152U (en) | 2010-05-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009201759358U Expired - Fee Related CN201477152U (en) | 2009-08-28 | 2009-08-28 | Alternating current full wave zero-cross checking device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103592544A (en) * | 2013-11-21 | 2014-02-19 | 中国第一汽车股份有限公司 | Feedback signal collecting method of power equipment by adopting thyristor as power switch |
| CN105006984A (en) * | 2015-08-04 | 2015-10-28 | 上海鼎凡电工机械股份有限公司 | Wire and cable equipment continuous annealing direct-current control system |
| CN107957514A (en) * | 2016-10-14 | 2018-04-24 | 佛山市顺德区美的电热电器制造有限公司 | A kind of zero crossing detection device, method and electric appliance |
| CN108322026A (en) * | 2018-03-28 | 2018-07-24 | 江苏新安电器有限公司 | A kind of air-conditioning filter circuit |
| CN109477861A (en) * | 2016-03-14 | 2019-03-15 | 安培计算有限责任公司 | Self-reference on piece voltage declines detector |
| EP3614544A1 (en) * | 2018-08-22 | 2020-02-26 | Honeywell International Inc. | Modulating input device having a full wave rectifier |
-
2009
- 2009-08-28 CN CN2009201759358U patent/CN201477152U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103592544A (en) * | 2013-11-21 | 2014-02-19 | 中国第一汽车股份有限公司 | Feedback signal collecting method of power equipment by adopting thyristor as power switch |
| CN105006984A (en) * | 2015-08-04 | 2015-10-28 | 上海鼎凡电工机械股份有限公司 | Wire and cable equipment continuous annealing direct-current control system |
| CN109477861A (en) * | 2016-03-14 | 2019-03-15 | 安培计算有限责任公司 | Self-reference on piece voltage declines detector |
| CN107957514A (en) * | 2016-10-14 | 2018-04-24 | 佛山市顺德区美的电热电器制造有限公司 | A kind of zero crossing detection device, method and electric appliance |
| CN107957514B (en) * | 2016-10-14 | 2020-12-04 | 佛山市顺德区美的电热电器制造有限公司 | Zero-crossing detection device and method and electric appliance |
| CN108322026A (en) * | 2018-03-28 | 2018-07-24 | 江苏新安电器有限公司 | A kind of air-conditioning filter circuit |
| EP3614544A1 (en) * | 2018-08-22 | 2020-02-26 | Honeywell International Inc. | Modulating input device having a full wave rectifier |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100519 Termination date: 20100828 |