CN103592511B - A kind of circuit detecting ac power frequency - Google Patents
A kind of circuit detecting ac power frequency Download PDFInfo
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- CN103592511B CN103592511B CN201310571583.9A CN201310571583A CN103592511B CN 103592511 B CN103592511 B CN 103592511B CN 201310571583 A CN201310571583 A CN 201310571583A CN 103592511 B CN103592511 B CN 103592511B
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- buck inductor
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- power supply
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Abstract
The invention discloses a kind of circuit detecting ac power frequency, it is made up of the AC alternating current power supply being sequentially connected with, common mode and buck inductor module, current limliting division module, frequency detecting modular converter, described common mode and buck inductor module include common mode inductance, are positioned at the buck inductor forming outside common mode inductance and with it transformer action, common mode inductance is connected with AC alternating current power supply, and buck inductor two ends are connected with frequency detecting modular converter by current limliting division module. The present invention is by increasing and the buck inductor of common mode inductance formation transformer action; output is made to reduce to the voltage of detection; but frequency is consistent with the frequency of alternating current power supply; realize the detection of supply frequency and phase place; reducing the components and parts caused due to abnormity of power supply or surge thunderbolt to destroy, the holistic cost of circuit reduces simultaneously. The present invention can be widely used in employing Switching Power Supply and need to carry out, on the household electrical appliance of ac power frequency detection, product quality and cost being respectively provided with suitable meaning.
Description
Technical field
The present invention relates to appliance field, particularly a kind of circuit detecting ac power frequency.
Background technology
Part household electrical appliances need the detection frequency of alternating current power supply, phase angle to realize the control of alternating current motor or other synchronous motors, such as position phase control motor etc.
For above-mentioned situation, many affiliated enterprises and fan have carried out very many-sided trial and Improvement, after current detection method directly carries out power taking from the live wire (L line) of civil power and zero line (N line) substantially, by current limliting division module 4, frequency detecting modular converter 5 is converted to the pulse signal that may determine that frequency, circuit diagram is as shown in Figure 1, AC alternating current power supply 1, common mode inductance module 2 ', Switching Power Supply and other circuit modules 3 are sequentially connected with, current limliting division module 4 respectively with common mode inductor module 2 ', live wire and zero line between Switching Power Supply and other circuit modules 3 connect, export again to frequency detecting modular converter 5. but, the problem that this method exists quality safety. owing to being directly detect from alternating current power supply power taking, when the surge of abnormity of power supply or exception is struck by lightning generation, too high voltage frequently results in the destruction of current limliting divider resistance R1/R2, photoelectrical coupler PC1, and safe accident even can occur. for corresponding abnormally high-voltage or surge thunderbolt, current producer generally reduces destruction by improving constantly the pressure voltage of testing circuit components and parts R1/R2, PC1, and not only cost is high, and still can not stop the generation destroyed.
Summary of the invention
For overcoming shortcoming of the prior art, the present invention provides a kind of circuit detecting ac power frequency, and its safety is greatly improved and holistic cost decline.
In order to solve above-mentioned technical problem, the present invention is achieved by the following technical solutions: a kind of circuit detecting ac power frequency, it is characterized in that: be made up of the AC alternating current power supply being sequentially connected with, common mode and buck inductor module, current limliting division module, frequency detecting modular converter, described common mode and buck inductor module include common mode inductance, are positioned at the buck inductor forming outside common mode inductance and with it transformer action, common mode inductance is connected with AC alternating current power supply, and buck inductor two ends are connected with frequency detecting modular converter by current limliting division module.
Described common mode inductance includes two, connects live wire and the zero line of AC alternating current power supply respectively, and buck inductor is located in one of outside common mode inductance and forms with it transformer action, and buck inductor is the step down side in described transformer action.
The output voltage of shown buck inductor is lower than 45 volts.
The winding turns of described buck inductor is within the 20% of the winding turns of corresponding common mode inductance.
Described frequency detecting modular converter includes the photoelectrical coupler as conversion element or semiconductor switch device.
The present invention is based on the common mode inductance being used for corresponding EMC in existing switch power supply system; by increasing and the buck inductor of common mode inductance formation transformer action; output is made to reduce to the voltage of detection; but frequency is consistent with the frequency of alternating current power supply; realize the detection of supply frequency and phase place; reducing the components and parts caused due to abnormity of power supply or surge thunderbolt to destroy, the holistic cost of circuit reduces simultaneously. The present invention can be widely used in employing Switching Power Supply and need to carry out, on the household electrical appliance of ac power frequency detection, product quality and cost being respectively provided with suitable meaning.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the detection ac power frequency of prior art;
Fig. 2 is the circuit diagram of the detection ac power frequency of the present invention.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
The present invention is a kind of circuit detecting ac power frequency, as in figure 2 it is shown, be made up of the AC alternating current power supply 1 being sequentially connected with, common mode and buck inductor module 2, current limliting division module 4, frequency detecting modular converter 5.
Common mode and buck inductor module 2 include: common mode inductance N1, the N2 being connected with AC alternating current power supply 1 live wire (L line) and zero line (N line) respectively; And be positioned at the arbitrary outside of common mode inductance N1 or N2 and form with it the buck inductor N3 of transformer action, the winding turns of the buck inductor N3 winding turns less than corresponding common mode inductance N1 or N2. Buck inductor N3 is positioned at the outside of common mode inductance N2 and forms with it transformer action in the present embodiment, and buck inductor N3 is the step down side in described transformer action. Preferably, the winding turns of buck inductor N3 is within the 20% of the winding turns of corresponding common mode inductance N1 or N2. Being preferably the safe voltage of below 45V after blood pressure lowering, now people touches and does not also cause danger, and simultaneously takes account of the resistance to pressure of other electronic devices and components, can suitably reduce again.
AC alternating current power supply 1 is connected with Switching Power Supply and other circuit modules 3 by common mode inductance N1, N2 of common mode and buck inductor module 2, forms traditional switch power supply. Buck inductor N3 two ends are then connected with frequency detecting modular converter 5 by current limliting division module 4, it is achieved carry out the detection of ac frequency under low voltage condition.Blood pressure lowering electricity N3 two ends connect current limliting division module 4 respectively, more respectively rate of connections detection modular converter 5 input, convert it to the pulse signal that may determine that frequency at outfan. Frequency detecting change-over circuit includes can as the photoelectrical coupler of conversion element or semiconductor switch device. In this circuit, current limliting division module 4 and in frequency detecting modular converter 5 specification value of electronic component such as R1, R2, PC1 can reduce to realize cost and decline.
Fig. 2 is embodiments of the invention schematic diagram, for certain money for adopting the circuit of ac power frequency detection in the household electrical appliances of Switching Power Supply
AC alternating current power supply 1 inputs, and after preliminary protection and filter circuit module 6, inputs common mode and buck inductor module 2.
In common mode and buck inductor module 2, common mode inductance N1, N2(N1=N2) after common mode filtering, output is to the Switching Power Supply of rear class and other circuit modules 3, it is achieved the EMC filter function of common mode inductance. Simultaneously, common mode inductance N2 and buck inductor N3 forms transformer action, by the effect of electromagnetic induction, simultaneously because the N2 coil-winding number of turns is more than the N3 coil-winding number of turns, N3 coil both sides produce relatively low suitable sensing alternating voltage, and its frequency keeps consistent with position with AC ac power frequency, phase place. In this example, it is assumed that the output valve needing buck inductor N3 is 30V, and common mode inductance N2 winding is 2200 circles, then buck inductor N3 winding is set to 300 circles. Buck inductor N3 output voltage, after resistance R1, the R2 of current limliting division module 4, is input to the input of the photoelectrical coupler PC1 of frequency detecting modular converter 5. Photoelectrical coupler PC1 is through the on-off action of low and high level, the square wave of 5V voltage is exported at its delivery outlet, the Filtering Processing of electric capacity C1 after filtering, eliminate the noise in signal, exporting and detect to MCU for it, calculate the frequency of AC alternating current power supply, real-time phase information, thus realizing when low cost, detecting the frequency of alternating current power supply, phase information. Owing to buck inductor N3 output voltage is low-voltage, can effectively prevent the destruction of lightning surge, electrical network abnormal pressure.
Claims (5)
1. the circuit detecting ac power frequency, including AC alternating current power supply, current limliting division module and frequency detecting modular converter, it is characterized in that: also include common mode and buck inductor module, AC alternating current power supply, common mode and buck inductor module, current limliting division module, frequency detecting modular converter is sequentially connected with built-up circuit, described common mode and buck inductor module include common mode inductance, it is positioned at the buck inductor forming outside common mode inductance and with it transformer action, common mode inductance is connected with AC alternating current power supply, buck inductor two ends are connected with frequency detecting modular converter by current limliting division module.
2. the circuit of detection ac power frequency according to claim 1, it is characterized in that: described common mode inductance includes two, connect live wire and the zero line of AC alternating current power supply respectively, buck inductor is located in one of outside common mode inductance and forms with it transformer action, and buck inductor is the step down side in described transformer action.
3. the circuit of detection ac power frequency according to claim 1, it is characterised in that: the output voltage of shown buck inductor is lower than 45 volts.
4. the circuit of detection ac power frequency according to claim 1, it is characterised in that: the winding turns of described buck inductor is within the 20% of the winding turns of corresponding common mode inductance.
5. the circuit of detection ac power frequency according to claim 1, it is characterised in that: described frequency detecting modular converter includes the photoelectrical coupler as conversion element or semiconductor switch device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310571583.9A CN103592511B (en) | 2013-11-13 | 2013-11-13 | A kind of circuit detecting ac power frequency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310571583.9A CN103592511B (en) | 2013-11-13 | 2013-11-13 | A kind of circuit detecting ac power frequency |
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| Publication Number | Publication Date |
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| CN103592511A CN103592511A (en) | 2014-02-19 |
| CN103592511B true CN103592511B (en) | 2016-06-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310571583.9A Active CN103592511B (en) | 2013-11-13 | 2013-11-13 | A kind of circuit detecting ac power frequency |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103852638B (en) * | 2014-03-19 | 2016-03-23 | 成都引众数字设备有限公司 | For detecting the testing circuit of power frequency output frequency |
| CN103825600B (en) * | 2014-03-19 | 2016-08-17 | 成都引众数字设备有限公司 | A kind of contact input interface circuit |
| CN103928945A (en) * | 2014-05-07 | 2014-07-16 | 清源科技（厦门）股份有限公司 | Photovoltaic grid-connected system without transformers |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1815248A (en) * | 2005-02-02 | 2006-08-09 | 艾默生网络能源系统有限公司 | Alternating Current Frequency Monitoring Method |
| CN201319041Y (en) * | 2008-12-08 | 2009-09-30 | 徐鸿 | Frequency automatic tracking circuit of AC sampling measurement |
| CN202757999U (en) * | 2012-08-17 | 2013-02-27 | 佛山市柏克新能科技股份有限公司 | Frequency and phase position detector for AC power supply |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09308087A (en) * | 1996-05-13 | 1997-11-28 | Matsushita Electric Ind Co Ltd | Ac input misuse preventing device |
| JPH11344515A (en) * | 1998-06-01 | 1999-12-14 | Shigeru Ohigata | Frequency detector |
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2013
- 2013-11-13 CN CN201310571583.9A patent/CN103592511B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1815248A (en) * | 2005-02-02 | 2006-08-09 | 艾默生网络能源系统有限公司 | Alternating Current Frequency Monitoring Method |
| CN201319041Y (en) * | 2008-12-08 | 2009-09-30 | 徐鸿 | Frequency automatic tracking circuit of AC sampling measurement |
| CN202757999U (en) * | 2012-08-17 | 2013-02-27 | 佛山市柏克新能科技股份有限公司 | Frequency and phase position detector for AC power supply |
Non-Patent Citations (1)
| Title |
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| 一种基于MSP430单片机的交流频率检测系统;韩正伟等;《微计算机信息》;20061231;第22卷(第10-2期);247-249页 * |
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| CN103592511A (en) | 2014-02-19 |
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