CN203166470U - Three-phase AC power supply phase sequence protection circuit, protection device and air conditioner - Google Patents
Three-phase AC power supply phase sequence protection circuit, protection device and air conditioner Download PDFInfo
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- CN203166470U CN203166470U CN 201320155612 CN201320155612U CN203166470U CN 203166470 U CN203166470 U CN 203166470U CN 201320155612 CN201320155612 CN 201320155612 CN 201320155612 U CN201320155612 U CN 201320155612U CN 203166470 U CN203166470 U CN 203166470U
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Abstract
The utility model provides a three-phase AC power supply phase sequence protection circuit, a protection device and an air conditioner. The phase sequence protection circuit comprises a switch power supply circuit which is connected with a first phase power supply and a second phase power supply; a first voltage dividing circuit, wherein one end of the circuit is connected with the second phase power supply, and the other end of the circuit is connected with the switch power supply circuit; a second voltage dividing circuit, wherein one end of the circuit is connected with a third phase power supply, and the other end of the circuit is connected with the switch power supply; a first comparison circuit, wherein a first input end and a second input end of the circuit are connected with the first voltage dividing circuit and the switch power supply circuit respectively; a second comparison circuit, wherein a first input end and a second input end of the circuit are respectively connected with the second voltage dividing circuit and the switch power supply circuit; a triggering circuit, wherein a clock input end and a data input end of the circuit are respectively connected with the first comparison circuit and the second comparison circuit; an executive circuit, wherein an input end of the circuit is connected with an output end of the triggering circuit. According to the phase protection circuit of the utility model, the inverse phase protection, phase lack protection and undervoltage protection can be realized, and the phase protection circuit has the advantages of simplicity and low cost.
Description
Technical field
The utility model relates to power phase protection field, particularly relates to a kind of three-phase alternating-current supply phase sequence circuit, three-phase alternating-current supply phase sequence relay and air conditioner.
Background technology
In electric control system, under-voltage protection, open-phase protection and phase sequence are the defencive functions of common three-phase alternating-current supply.In the prior art, generally adopt microprocessor to carry out for under-voltage, the phase shortage of three-phase alternating-current supply and monitoring and the protection of phase sequence, this kind monitoring and protected mode are at first carried out the square wave processing to three-phase alternating-current supply and are obtained three road signals, import single-chip microcomputer again, detect by the software of writing, its complete function, but expensive; For not using microprocessor to monitor and protected mode, its detection method complexity, need use at least three road comparators and with logical devices such as door, the power supply of logical device obtains for the capacitance-resistance dividing potential drop, the more and insufficiency of used components and parts has potential safety hazard.
Summary of the invention
At above-mentioned prior art present situation, technical problem to be solved in the utility model is, provide a kind of simply, three-phase alternating-current supply phase sequence circuit and protector cheaply, provide the anti-phase protection, open-phase protection, under-voltage protection function.Another technical problem to be solved in the utility model is to provide a kind of air conditioner with this protective circuit.
In order to solve the problems of the technologies described above, a kind of three-phase alternating-current supply phase sequence method provided by the utility model, described three-phase alternating-current supply includes the first phase power supply, the second phase power supply and third phase power supply, and described guard method comprises the steps:
With the described first phase power supply and the described second power supply input switch power circuit mutually, obtain dc offset voltage, DC reference voltage and operating voltage;
The described second phase power supply is obtained first voltage signal through the first bleeder circuit dividing potential drop and after described dc offset voltage biasing, described third phase power supply is obtained second voltage signal through the second bleeder circuit dividing potential drop and after described dc offset voltage biasing;
Described first voltage signal is imported first comparison circuit and described DC reference voltage obtain first comparison signal after relatively, described second voltage signal is imported second comparison circuit and described DC reference voltage obtain second comparison signal after relatively;
With described first comparison signal and described second comparison signal signal that is protected behind the input end of clock of input trigger circuit and the data input pin respectively.
Therein among embodiment, the voltage peak of the AC signal that described dc offset voltage obtains greater than described first bleeder circuit and the described second bleeder circuit dividing potential drop.
Among embodiment, described DC reference voltage is less than or equal to the voltage peak of described first voltage signal and described second voltage signal therein.
Among embodiment, described circuits for triggering are the d type flip flop that rising edge triggers therein.
A kind of three-phase alternating-current supply phase sequence circuit that the utility model provides, described three-phase alternating-current supply includes the first phase power supply, the second phase power supply and third phase power supply, and described phase sequence circuit comprises:
Switching power circuit, its first input end is connected with the described second phase power supply with the described first phase power supply respectively with second input, is used for providing dc offset voltage, DC reference voltage and operating voltage;
First bleeder circuit, the one end is connected with the described second phase power supply, and the other end is connected with the dc offset voltage output of switching power circuit, is used for obtaining first voltage signal after the described second phase power supply dividing potential drop, the biasing;
Second bleeder circuit, the one end is connected with described third phase power supply, and the other end is connected with the dc offset voltage output of switching power circuit, is used for obtaining second voltage signal after described third phase power supply dividing potential drop, the biasing;
First comparison circuit, its first input end is connected with the output of described first bleeder circuit and the DC reference voltage output of described switching power circuit respectively with second input, is used for described first voltage signal and described DC reference voltage are relatively exported first comparison signal in the back;
Second comparison circuit, its first input end is connected with the output of described second bleeder circuit and the DC reference voltage output of described switching power circuit respectively with second input, is used for described second voltage signal and described DC reference voltage are relatively exported second comparison signal in the back;
Circuits for triggering, its input end of clock is connected with the output of described first comparison circuit and the output of described second comparison circuit respectively with data input pin, is used for according to described first comparison signal and the described second comparison signal output protection signal;
Executive circuit, its input is connected with the output of described circuits for triggering.
Therein among embodiment, the voltage peak of the AC signal that described dc offset voltage obtains greater than described first bleeder circuit and the described second bleeder circuit dividing potential drop.
Among embodiment, described DC reference voltage is less than or equal to the voltage peak of described first voltage signal and described second voltage signal therein.
Among embodiment, described circuits for triggering are the d type flip flop that rising edge triggers therein.
Among embodiment, described first bleeder circuit comprises first resistance and second resistance that is in series therein, and described second bleeder circuit comprises the 3rd resistance and the 4th resistance that is in series.
A kind of three-phase alternating-current supply phase sequence relay provided by the utility model comprises shell and places the interior above-mentioned three-phase alternating-current supply phase sequence circuit of this shell.
A kind of air conditioner provided by the utility model comprises master control borad and three-phase compressor, contains above-mentioned three-phase alternating-current supply phase sequence circuit on the described master control borad.
Compared with prior art, three-phase alternating-current supply phase sequence circuit provided by the utility model and protector, three live wires that only need to insert three-phase alternating-current supply are implemented to detect, and can realize anti-phase protection, open-phase protection and under-voltage protection, and are very simple; And, only need two comparators and a trigger can realize that cost is very low.
Description of drawings
Fig. 1 is the circuit diagram of the three-phase alternating-current supply phase sequence circuit among one of them embodiment of the utility model;
Fig. 2 is for being the voltage oscillogram of the three phase mains of reference with the zero line;
Fig. 3 is mutually as the voltage oscillogram with reference to ground with c;
Fig. 4 is the voltage oscillogram behind bleeder circuit dividing potential drop and direct current biasing;
The signal waveforms that Fig. 5 exports behind comparator when being anti-phase;
The signal waveforms that Fig. 6 just often exports behind comparator for three-phase alternating-current supply.
Embodiment
Also in conjunction with the embodiments the utility model is elaborated below with reference to accompanying drawing.Need to prove, under the situation of not conflicting, below feature among each embodiment and the embodiment can make up mutually.
Among one of them embodiment of the utility model, provide a kind of three-phase alternating-current supply phase sequence method, as shown in Figure 1, described three-phase alternating-current supply includes the first phase power supply C, the second phase power supply B and third phase power supply A, and described guard method comprises the steps:
Step 1, with the described first phase power supply C and the described second power supply B input switch power circuit U mutually, obtain dc offset voltage V1, DC reference voltage V2 and direct-current working volts.Switching power circuit U is safe and reliable, can improve antijamming capability.Operating voltage provides direct voltage for the first comparison circuit U1b, the second comparison circuit U1a, circuits for triggering U2 and executive circuit U3.Figure 2 shows that the voltage waveform when common three-phase alternating-current supply with the zero line is reference ground, in the present embodiment the first phase power supply C is seen as with reference to ground, respectively with the voltage of the second phase power supply B and third phase power supply A deduct first mutually the voltage of power supply C can obtain as shown in Figure 3 voltage oscillogram, so just the power conversion that three-phase mutual deviation 120 is spent is for the power supply of two-phase mutual deviation 60 degree, i.e. AC among Fig. 3 and BC.
Step 2, the first bleeder circuit dividing potential drop that the described second phase power supply B is composed in series via first resistance R 3 and second resistance R 4 also obtain the first voltage signal bc (as shown in Figure 4) after described dc offset voltage V1 biasing, the second bleeder circuit dividing potential drop that described third phase power supply A is composed in series via the 3rd resistance R 1 and the 4th resistance R 2 also obtains the second voltage signal ac (as shown in Figure 4) after described dc offset voltage V1 biasing.Preferably, the voltage peak of the AC signal that described dc offset voltage V1 obtains greater than described first bleeder circuit and the described second bleeder circuit dividing potential drop avoids damaging comparator.
Step 3, the described first voltage signal bc is imported the relatively back output first comparison signal CLK (as shown in Figure 5) of the first comparison circuit U1b and described DC reference voltage V2, will the described second voltage signal ac import the second comparison circuit U1a and relatively afterwards export the second comparison signal D (as shown in Figure 5) with described DC reference voltage V2.Preferably, described DC reference voltage V2 is less than or equal to the voltage peak ac of the described first voltage signal bc and described second voltage signal.
Step 4, with the described first comparison signal CLK and described second comparison signal D output protection signal behind the input end of clock of input trigger circuit U2 and the data input pin respectively.Preferably, described circuits for triggering are the d type flip flop that rising edge triggers.Transfer to executive circuit U3 from the guard signal of circuits for triggering U2 output, the effect of executive circuit U3 is that the guard signal with circuits for triggering U2 output amplifies in order to directly opening or to turn-off contactor, thereby makes the three phase electric machine operation or stop.Can realize anti-phase protection, open-phase protection and under-voltage protection, specific implementation is as follows:
One, under-voltage protection implementation
By suitable DC reference voltage V2 is set; if the maximum voltage value of signal voltage ac or bc all can not be greater than V2; then can not output signal D or CLK; then can not make the output Q output high level of circuits for triggering U2; then there is not normal working signal output; executive circuit U3 can not work, and plays the effect of under-voltage protection.
Two, open-phase protection implementation
As shown in Figure 1, A does not insert as the third phase power supply, does not then have the input of the second comparison signal D, and then circuits for triggering U2 does not have normal working signal output; If the second phase power supply B do not insert, then do not have the output of the first comparison signal CLK, and switching power circuit U can't work, then circuits for triggering U2 does not have normal working signal output; If the first phase power supply C does not insert, then switching power circuit U can't work, and entire circuit can not be worked, and then the output Q of circuits for triggering U2 does not have normal working signal output, and executive circuit U3 can not work, and plays the effect of open-phase protection.
Three, anti-phase protection implementation
As shown in Figure 5; the second comparison signal D after; the first comparison signal CLK is preceding; circuits for triggering U2 is that rising edge triggers; the level of the second comparison signal D can be passed to the output of circuits for triggering U2 when running into the first comparison signal CLK for rising edge, the second comparison signal D level is low this moment among Fig. 5, and namely the output Q of circuits for triggering U2 does not have the output of normal working signal; executive circuit U3 can not work, and plays the effect of anti-phase protection.
Four, operate as normal implementation
As shown in Figure 6, when three-phase alternating-current supply voltage normally, not when phase shortage and positive sequence, the second comparison signal D is preceding, the first comparison signal CLK after, circuits for triggering U2 is that rising edge triggers, when running into the first comparison signal CLK for rising edge, the level of the second comparison signal D can be passed to the output of circuits for triggering U2, among Fig. 6 this moment circuits for triggering U2 the data input pin level be height, the output that is circuits for triggering U2 is output as height, the output Q of circuits for triggering U2 exports normal working signal, executive circuit U3 work.
Among another embodiment of the utility model, provide a kind of three-phase alternating-current supply phase sequence circuit, as shown in Figure 1, described three-phase alternating-current supply includes the first phase power supply C, the second phase power supply B and third phase power supply A, and described phase sequence circuit comprises:
Switching power circuit U, its first input end is connected with the described second phase power supply B with the described first phase power supply C respectively with second input, is used for providing dc offset voltage V1, DC reference voltage V2 and direct-current working volts.
First bleeder circuit, the one end is connected with the described second phase power supply B, and the other end is connected with the dc offset voltage output of switching power circuit U, is used for obtaining the first voltage signal bc after the described second phase power supply B dividing potential drop, the biasing.First bleeder circuit in the present embodiment comprises first resistance R 3 and second resistance R 4 that is in series.
Second bleeder circuit, the one end is connected with described third phase power supply A, and the other end is connected with the dc offset voltage output of switching power circuit U, is used for obtaining the second voltage signal ac after described third phase power supply A dividing potential drop, the biasing.Second bleeder circuit in the present embodiment comprises the 3rd resistance R 1 and the 4th resistance R 2 that is in series.
The first comparison circuit U1b, its first input end is connected with the output of described first bleeder circuit and the DC reference voltage output of described switching power circuit U respectively with second input, is used for the described first voltage signal bc and described DC reference voltage V2 are relatively exported the square wave first comparison signal CLK in the back.
The second comparison circuit U1a, its first input end is connected with the output of described second bleeder circuit and the DC reference voltage output of described switching power circuit U respectively with second input, is used for the described second voltage signal ac and described DC reference voltage V2 are relatively exported the square wave second comparison signal D in the back.
Circuits for triggering U2, its input end of clock is connected with the output of the described first comparison circuit U1b and the output of the described second comparison circuit U1a respectively with data input pin, is used for according to the described first comparison signal CLK and the described second comparison signal D output protection signal;
Executive circuit U3, its input is connected with the output of described circuits for triggering U2.The effect of executive circuit U3 is that the guard signal with circuits for triggering U2 output amplifies in order to directly opening or to turn-off contactor, thereby makes the three phase electric machine operation or stop.
Preferably, the voltage peak of the AC signal that obtains greater than described first bleeder circuit and the described second bleeder circuit dividing potential drop of described dc offset voltage V1.
Preferably, described DC reference voltage V2 is less than or equal to the voltage peak of the described first voltage signal bc and the described second voltage signal ac.
Preferably, described circuits for triggering are the d type flip flop that rising edge triggers.
Among another embodiment of the utility model, provide a kind of three-phase alternating-current supply phase sequence relay, comprise shell and the three-phase alternating-current supply phase sequence circuit that places the above-described embodiment in this shell.
This shows, three-phase alternating-current supply phase sequence circuit and protector that the utility model embodiment provides, three live wires that only need to insert three-phase alternating-current supply are implemented to detect, and can realize anti-phase protection, open-phase protection and under-voltage protection, and are very simple; And, only need two comparators and a trigger can realize that cost is very low.
Among another embodiment of the utility model, provide a kind of air conditioner, comprise master control borad and three-phase compressor, contain the three-phase alternating-current supply phase sequence circuit in above-described embodiment on the described master control borad.Air conditioner can play anti-phase protection, open-phase protection and under-voltage protection to compressor owing to adopted three-phase alternating-current supply phase sequence circuit.
Certainly, the three-phase alternating-current supply phase sequence method in the present embodiment and protective device can also be applied to other occasion.
The above embodiment has only expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model claim.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the utility model design, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (7)
1. three-phase alternating-current supply phase sequence circuit, described three-phase alternating-current supply includes the first phase power supply, the second phase power supply and third phase power supply, it is characterized in that, and described phase sequence circuit comprises:
Switching power circuit, its first input end is connected with the described second phase power supply with the described first phase power supply respectively with second input, is used for providing dc offset voltage, DC reference voltage and operating voltage;
First bleeder circuit, the one end is connected with the described second phase power supply, and the other end is connected with the dc offset voltage output of switching power circuit, is used for obtaining first voltage signal after the described second phase power supply dividing potential drop, the biasing;
Second bleeder circuit, the one end is connected with described third phase power supply, and the other end is connected with the dc offset voltage output of switching power circuit, is used for obtaining second voltage signal after described third phase power supply dividing potential drop, the biasing;
First comparison circuit, its first input end is connected with the output of described first bleeder circuit and the DC reference voltage output of described switching power circuit respectively with second input, is used for described first voltage signal and described DC reference voltage are relatively exported first comparison signal in the back;
Second comparison circuit, its first input end is connected with the output of described second bleeder circuit and the DC reference voltage output of described switching power circuit respectively with second input, is used for described second voltage signal and described DC reference voltage are relatively exported second comparison signal in the back;
Circuits for triggering, its input end of clock is connected with the output of described first comparison circuit and the output of described second comparison circuit respectively with data input pin, is used for according to described first comparison signal and the described second comparison signal output protection signal;
Executive circuit, its input is connected with the output of described circuits for triggering.
2. three-phase alternating-current supply phase sequence circuit according to claim 1 is characterized in that, the voltage peak of the AC signal that described dc offset voltage obtains greater than described first bleeder circuit and the described second bleeder circuit dividing potential drop.
3. three-phase alternating-current supply phase sequence circuit according to claim 1 is characterized in that, described DC reference voltage is less than or equal to the voltage peak of described first voltage signal and described second voltage signal.
4. three-phase alternating-current supply phase sequence circuit according to claim 1 is characterized in that, described circuits for triggering are the d type flip flop that rising edge triggers.
5. three-phase alternating-current supply phase sequence circuit according to claim 1 is characterized in that, described first bleeder circuit comprises first resistance and second resistance that is in series, and described second bleeder circuit comprises the 3rd resistance and the 4th resistance that is in series.
6. a three-phase alternating-current supply phase sequence relay is characterized in that, comprise shell and place in this shell as any described three-phase alternating-current supply phase sequence circuit of claim 1 to 5.
7. an air conditioner comprises master control borad and three-phase compressor, it is characterized in that, contains on the described master control borad just like any described three-phase alternating-current supply phase sequence circuit in the claim 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320155612 CN203166470U (en) | 2013-03-29 | 2013-03-29 | Three-phase AC power supply phase sequence protection circuit, protection device and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320155612 CN203166470U (en) | 2013-03-29 | 2013-03-29 | Three-phase AC power supply phase sequence protection circuit, protection device and air conditioner |
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| Publication Number | Publication Date |
|---|---|
| CN203166470U true CN203166470U (en) | 2013-08-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320155612 Withdrawn - After Issue CN203166470U (en) | 2013-03-29 | 2013-03-29 | Three-phase AC power supply phase sequence protection circuit, protection device and air conditioner |
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| CN (1) | CN203166470U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104078931A (en) * | 2013-03-29 | 2014-10-01 | 珠海格力电器股份有限公司 | Protective method, protective circuit and protector for three-phase alternating-current power source phase sequence and air conditioner |
-
2013
- 2013-03-29 CN CN 201320155612 patent/CN203166470U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104078931A (en) * | 2013-03-29 | 2014-10-01 | 珠海格力电器股份有限公司 | Protective method, protective circuit and protector for three-phase alternating-current power source phase sequence and air conditioner |
| CN104078931B (en) * | 2013-03-29 | 2017-03-15 | 珠海格力电器股份有限公司 | Three-phase alternating-current supply phase sequence method, protection circuit, protector and air conditioner |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130828 Effective date of abandoning: 20171114 |
|
| AV01 | Patent right actively abandoned |