CN203825086U - Three-phase power frequency detection circuit of combination switch - Google Patents
Three-phase power frequency detection circuit of combination switch Download PDFInfo
- Publication number
- CN203825086U CN203825086U CN201420007871.1U CN201420007871U CN203825086U CN 203825086 U CN203825086 U CN 203825086U CN 201420007871 U CN201420007871 U CN 201420007871U CN 203825086 U CN203825086 U CN 203825086U
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- circuit
- electrically connected
- resistance
- resonant
- control chip
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Abstract
The utility model discloses a three-phase power frequency detection circuit of a combination switch. The three-phase power frequency detection circuit comprises a main circuit used for electrically connecting with a control chip and an input end used for electrically connected with three-phase power. The input end and the main circuit are electrically connected. The main circuit comprises a conversion circuit and a resonance circuit. The conversion circuit comprises multiple conversion resistors. Each of the conversion resistors is connected in series with an optocoupler replay. The conversion resistors are electrically connected with the input end. The optocoupler replays are electrically connected with the resonance circuit. The resonance circuit comprises multiple resonance resistors. Each of the resonance resistors is connected in parallel with an inductor. The resonance circuit is electrically connected with the control chip. According to the three-phase power frequency detection circuit of the utility model, the resonance circuit is added between the optocoupler replays and the control chip and can be used for amplifying frequency signals inputted by the optocoupler replays to the control chip, thereby improving the anti-interference performance of the signals.
Description
Technical field
The utility model relates to a kind of combination switch, relates in particular a kind of three-phase electricity frequency detection circuit of combination switch.
Background technology
Combination switch has without remarkable advantages such as impact, low-power consumption, high life, and alternative contactor or thyristor switch, be widely used in low-pressure reactive compensation field.
Combination switch just needs the three-phase electricity frequency in detection of grid in work, current existing pick-up unit is all on the input end of three-phase electricity, connect a resistance and light coupling relay, make chip and three-phase electricity carry out photoelectricity isolation, light coupling relay extract the frequency signal of three-phase electricity, then be directly inputted in control chip, because light coupling relay is direct-connected with control chip, but this connected mode is because the frequency signal that optocoupler can extract is more weak, in the situation that being subject to external interference, can make the signal and the actual measurement frequency signal out that are input to control chip inside produce deviation, control chip just cannot obtain frequency signal accurately.
Utility model content
The deficiency existing for prior art, the purpose of this utility model is to provide a kind of and is input to control chip signal by force and three-phase electricity frequency detection circuit accurately.
For achieving the above object, the utility model provides following technical scheme: a kind of three-phase electricity frequency detection circuit of combination switch, comprise main circuit and the input end for being electrically connected to three-phase electricity for being electrically connected to control chip, described input end is electrically connected to main circuit, described main circuit comprises change-over circuit and resonant circuit, described change-over circuit comprises several transfer resistances, described transfer resistance is in series with light coupling relay one by one, described transfer resistance is electrically connected to input end, described light coupling relay is electrically connected to resonant circuit, described resonant circuit comprises several resonant resistances, described resonant resistance is parallel with inductance one by one, described resonant circuit is electrically connected to control chip.
By adopting technique scheme, when combination switch is linked in three-phase electricity, internal circuit energising work, because input end is electrically connected to main circuit, main circuit comprises change-over circuit and resonant circuit, change-over circuit comprises several transfer resistances, transfer resistance is in series with light coupling relay one by one, transfer resistance is electrically connected to input end, characteristic due to the photoelectricity isolation of light coupling relay, the sine waveform that is input to the three-phase electricity of transfer resistance from input end can be done into a square wave, control chip just can obtain by this square wave the frequency numerical value of three-phase electricity, arranging of transfer resistance can effectively divide to fall the voltage in light coupling relay, protection light coupling relay, and resonant circuit comprises several resonant resistances, resonant resistance is parallel with inductance one by one, resonant circuit is electrically connected to control chip, resonant resistance and inductance can form an antiresonant circuit, antiresonant circuit is a kind of full remuneration circuit, the square-wave signal of exporting from light coupling relay can be carried out to an amplification, after amplifying, be sent among control chip, just there will not be because the frequency signal that the control chip that the reason of disturbing causes receives produces deviation.
The utility model is further set to: described main circuit also comprises indicating circuit, and described indicating circuit is in parallel with change-over circuit.
By adopting technique scheme, arranging of indicating circuit can allow testing circuit not only can allow control chip inside know frequency, can also allow extraneous people also can recognize the frequency of measured three-phase electricity by indicating circuit, simultaneously indicating circuit can also be known the work of whether switching on of testing circuit inside.
The utility model is further set to: described indicating circuit comprises several light emitting diodes and several indication resistance, described indication resistance is connected with light emitting diode, described light emitting diode is in parallel with transfer resistance, and described light emitting diode is electrically connected to light coupling relay.
By adopting technique scheme; flicker by light emitting diode just can show the frequency of measured three-phase electricity like this; whether luminous simultaneously can also learn the internal circuit work of whether switching on by diode, arranging of resistance of indication can effectively be protected light emitting diode.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the three-phase electricity frequency detection circuit of combination switch of the present utility model.
In figure: 1, input end; 2, main circuit; 21, change-over circuit; 22, resonant circuit; 23, indicating circuit; 3, control chip; RZ, transfer resistance; RX, resonant resistance; RS, indication resistance; U, light coupling relay; L, inductance.
Embodiment
Shown in Fig. 1, the three-phase electricity frequency detection circuit of a kind of combination switch of the present embodiment, comprise main circuit 2 and the input end 1 for being electrically connected to three-phase electricity for being electrically connected to control chip 3, described input end 1 is electrically connected to main circuit 2, described main circuit 2 comprises change-over circuit 21 and resonant circuit 22, described change-over circuit 21 comprises several transfer resistances RZ, described transfer resistance RZ is in series with light coupling relay U one by one, described transfer resistance RZ is electrically connected to input end 1, described light coupling relay U is electrically connected to resonant circuit 22, described resonant circuit 22 comprises several resonant resistances RX, described resonant resistance RX is parallel with inductance L one by one, described resonant circuit 22 is electrically connected to control chip 3.
By adopting technique scheme, when combination switch is linked in three-phase electricity, internal circuit energising work, because input end 1 is electrically connected to main circuit 2, main circuit 2 comprises change-over circuit 21 and resonant circuit 22, change-over circuit 21 comprises several transfer resistances RZ, transfer resistance RZ is in series with light coupling relay U one by one, described transfer resistance RZ is electrically connected to input end 1, characteristic due to the photoelectricity isolation of light coupling relay U, the sine waveform that is input to the three-phase electricity transfer resistance RZ from input end 1 can be done into a square wave, control chip 3 just can obtain by this square wave the frequency numerical value of three-phase electricity, arranging of transfer resistance RZ can effectively divide to fall the voltage on light coupling relay U, protection light coupling relay U, and light coupling relay U is electrically connected to resonant circuit 22, resonant circuit 22 comprises several resonant resistances RX, resonant resistance RX is parallel with inductance L one by one, resonant circuit 22 is electrically connected to control chip 3, resonant resistance RX and inductance L can form an antiresonant circuit 22, antiresonant circuit 22 is a kind of full remuneration circuit, can will carry out an amplification from the square-wave signal of light coupling relay U output, after amplifying, be sent among control chip 3, just there will not be because the frequency signal that the control chip 3 that the reason of disturbing causes receives produces deviation, preferably, it is the resistance of 4.7K that transfer resistance RZ and resonance resistance R X select resistance, because the magnitude of voltage of three-phase electricity is 220V, so transfer resistance RZ selects the resistance of 4.7K can reach a fine defencive function, resonant resistance RX can reach a good enlarging function with inductance L.
Described main circuit 2 also comprises indicating circuit 23, and described indicating circuit 23 is in parallel with change-over circuit 21.
By adopting technique scheme, arranging of indicating circuit 23 can allow testing circuit not only can allow control chip 3 inside know frequency, can also allow extraneous people also can recognize the frequency of measured three-phase electricity by indicating circuit 23, simultaneously indicating circuit 23 can also be known the work of whether switching on of testing circuit inside.
Described indicating circuit 23 comprises several light emitting diodes and several indication resistance R S, and described indication resistance R S connects with light emitting diode, and described light emitting diode is in parallel with transfer resistance RZ, and described light emitting diode is electrically connected to light coupling relay U.
By adopting technique scheme; flicker by light emitting diode just can show the frequency of measured three-phase electricity like this; simultaneously can also learn the internal circuit work of whether switching on by the whether luminous of diode; light emitting diode can be effectively protected in arranging of indication resistance R S; preferably; it is the resistance in 470 Europe that indication resistance R S selects resistance, and the glow current of light emitting diode is very little, so select the resistance in 470 Europe just can reach the object of protection light emitting diode.
The utlity model has following advantage: between light coupling relay U and control chip 3, added a resonant circuit 22, the frequency signal that just can be input on control chip 3 light coupling relay U by resonant circuit 22 amplifies, and has increased the anti-interference of signal, when combination switch is linked in three-phase electricity, internal circuit energising work, because input end 1 is electrically connected to main circuit 2, main circuit 2 comprises change-over circuit 21 and resonant circuit 22, change-over circuit 21 comprises several transfer resistances RZ, transfer resistance RZ is in series with light coupling relay U one by one, described transfer resistance RZ is electrically connected to input end 1, characteristic due to the photoelectricity isolation of light coupling relay U, the sine waveform that is input to the three-phase electricity transfer resistance RZ from input end 1 can be done into a square wave, control chip 3 just can obtain by this square wave the frequency numerical value of three-phase electricity, arranging of transfer resistance RZ can effectively divide to fall the voltage on light coupling relay U, protection light coupling relay U, and light coupling relay U is electrically connected to resonant circuit 22, resonant circuit 22 comprises several resonant resistances RX, resonant resistance RX is parallel with inductance L one by one, resonant circuit 22 is electrically connected to control chip 3, resonant resistance RX and inductance L can form an antiresonant circuit 22, antiresonant circuit 22 is a kind of full remuneration circuit, can will carry out an amplification from the square-wave signal of light coupling relay U output, after amplifying, be sent among control chip 3, just there will not be because the frequency signal that the control chip 3 that the reason of disturbing causes receives produces deviation, preferably, it is the resistance of 4.7K that transfer resistance RZ and resonance resistance R X select resistance, because the magnitude of voltage of three-phase electricity is 220V, so transfer resistance RZ selects the resistance of 4.7K can reach a fine defencive function, resonant resistance RX can reach a good enlarging function with inductance L.
The above is only preferred implementation of the present utility model, and protection domain of the present utility model is also not only confined to above-described embodiment, and all technical schemes belonging under the utility model thinking all belong to protection domain of the present utility model.It should be pointed out that for those skilled in the art, in the some improvements and modifications that do not depart under the utility model principle prerequisite, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (3)
1. the three-phase electricity frequency detection circuit of a combination switch, comprise main circuit and the input end for being electrically connected to three-phase electricity for being electrically connected to control chip, described input end is electrically connected to main circuit, it is characterized in that: described main circuit comprises change-over circuit and resonant circuit, described change-over circuit comprises several transfer resistances, described transfer resistance is in series with light coupling relay one by one, described transfer resistance is electrically connected to input end, described light coupling relay is electrically connected to resonant circuit, described resonant circuit comprises several resonant resistances, described resonant resistance is parallel with inductance one by one, described resonant circuit is electrically connected to control chip.
2. the three-phase electricity frequency detection circuit of combination switch according to claim 1, is characterized in that: described main circuit also comprises indicating circuit, and described indicating circuit is in parallel with change-over circuit.
3. the three-phase electricity frequency detection circuit of combination switch according to claim 2, it is characterized in that: described indicating circuit comprises several light emitting diodes and several indication resistance, described indication resistance is connected with light emitting diode, described light emitting diode is in parallel with transfer resistance, and described light emitting diode is electrically connected to light coupling relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420007871.1U CN203825086U (en) | 2014-01-04 | 2014-01-04 | Three-phase power frequency detection circuit of combination switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420007871.1U CN203825086U (en) | 2014-01-04 | 2014-01-04 | Three-phase power frequency detection circuit of combination switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203825086U true CN203825086U (en) | 2014-09-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420007871.1U Expired - Fee Related CN203825086U (en) | 2014-01-04 | 2014-01-04 | Three-phase power frequency detection circuit of combination switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203825086U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109799388A (en) * | 2018-11-30 | 2019-05-24 | 无锡市好达电子有限公司 | A kind of frequency of oscillation test method of resonator |
-
2014
- 2014-01-04 CN CN201420007871.1U patent/CN203825086U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109799388A (en) * | 2018-11-30 | 2019-05-24 | 无锡市好达电子有限公司 | A kind of frequency of oscillation test method of resonator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140910 Termination date: 20170104 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |