CN202486219U - Three-phase phase sequence detection circuit - Google Patents
Three-phase phase sequence detection circuit Download PDFInfo
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- CN202486219U CN202486219U CN2011205192601U CN201120519260U CN202486219U CN 202486219 U CN202486219 U CN 202486219U CN 2011205192601 U CN2011205192601 U CN 2011205192601U CN 201120519260 U CN201120519260 U CN 201120519260U CN 202486219 U CN202486219 U CN 202486219U
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Abstract
The utility model relates to a three-phase phase sequence detection circuit which comprises a Y-shaped circuit, a capacitor branch, a resistor branch and a series resistor branch. Three leading-out terminals of three branches are used to be connected with a three-phase power supply. The series resistor branch is composed of two resistors in series, and a series point is used to be connected with an analog to digital (AD) converting port of a single chip microcomputer. The three-phase phase sequence detection circuit can learn whether phase sequence is correct by detecting voltage of the series point and comparing with a pre-set voltage value. The three-phase phase sequence detection circuit is simple in circuit and can be integrated into a corresponding controller easily, and therefore automatic control is achieved, demands for operating personnel are reduced, and operational reliability of an air compressor is increased.
Description
Technical field
The utility model relates to a kind of three-phase phase-sequence testing circuit, especially for the three-phase phase-sequence detection protection warning circuit of screw air compressor control system.
Background technology
Air compressor machine as power source in the industry-by-industry widespread use, like machining, chemical industry, mine, medical treatment, food etc.Whether compressor operation stablizes the production that directly influences enterprise.Screw air compressor must be according to necessarily turning to work owing to reasons in structure, and counter-rotating will cause the machine major injury, even scraps.Therefore the screw air compressor controller must can detect power phase, and the control motor steering prevents that the motor counter-rotating from causing damage.
Existing phase sequence detects carries out through pick-up unit, and the pick-up unit circuit is as shown in Figure 1, comprises electric capacity (U node), bulb B1 (V node), bulb B2 (W node).It can (as shown in Figure 1, order be that U, V, W meet A, B, C or B, C, A or C, A, B according to the bright dark contrast judgement order of bulb and backward; Backward is that a, b, c meet A, C, B or B, A, C or C, B, A).Its rule is, connect electric capacity one leading mutually with connect brighter bulb one mutually, connect a phase of steeping and lag behind than concealed light.Like Fig. 1,,, then be positive phase sequence, otherwise then be negative phase sequence if B1 should be brighter than B2 when electric capacity U connects the A phase time.The method can only manually-operated, operating personnel is had relatively high expectations, and can not realize automatic control, causes error easily.
The utility model content
The purpose of the utility model provides a kind of three-phase phase-sequence testing circuit, in order to solve the existing low problem of detection method automaticity.
For realizing above-mentioned order; The scheme of the utility model is: a kind of three-phase phase-sequence testing circuit, comprise a Y type circuit, and comprise a capacitive branch;, a resistance branch and a resistance in series branch road; Article three, three of branch road leading-out terminals are used to connect three-phase supply, and resistance in series is propped up the series connection of route two resistance and constituted, and series connection point is used to be connected to the AD conversion port of a single-chip microcomputer.
Said resistance branch comprises first resistance (R1), and resistance in series is propped up route second resistance (R2) and constituted with the 3rd resistance (R3), and second resistance and the 3rd resistance sum equal first resistance.
Series connection point is connected to said AD conversion port through amplifying circuit.
Also be provided with current-limiting resistance (R4) between series connection point and the input amplifier.
The three-phase phase-sequence testing circuit of the utility model through comparing with the magnitude of voltage of setting, just can learn whether phase sequence is correct through detecting series connection point voltage.Circuit is simple, is easy to be incorporated in the corresponding controller, thereby realizes control automatically, thereby reduce operating personnel's requirement, and increase the compressor operation reliability.
Description of drawings
Fig. 1 is existing phase sequence detection mode synoptic diagram;
Fig. 2 is the testing circuit figure of the utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is done further detailed explanation.
Provide a kind of concrete three-phase detection circuit below; This circuit is integrated in the controller of screw air compressor; Like Fig. 1, three terminals of this three-phase detection circuit connect three connection terminals of U, V, W of air compressor machine controller respectively, and physical circuit is that the U end connects an electric capacity; The V end connects resistance R 1; W end connects the series connection bleeder circuit, and the series connection bleeder circuit is connected with R3 by resistance R 2 and constituted electric capacity, resistance R 1, resistance R 3 other end short circuits and O (electric capacity, resistance R 1, resistance in series R2 are connected with R3 formation Y type).Is connected amplifying circuit through a current-limiting resistance R4 output (AD node) on the series connection point of resistance R 2 and R3, amplifying circuit is through amplifying the AD conversion port that single-chip microcomputer is imported in the back.Detect partial pressure value (can also obtain the voltage of the whole bleeder circuit of connecting through R2 and R3 ratio) through single-chip microcomputer, compare with the setting voltage value that calculates whether can detect power phase correct.
For convenience of calculation, R2 is set to equate with R1 with the R3 sum.Magnitude of voltage and VCC coupling in order to sample should correspondingly make R2 and R3 ratio coupling.
The high-grade single-chip microcomputer PIC18F6622 that single-chip microcomputer adopts U.S. Microchip to produce, it has 256K FALSH, 4K RAM, 1KE
2PROM, inner 3 16 TIMER, 3 PWM, 2 enhancement mode UART and SPI, 12 10 high performance AD, its system clock is chosen as 11.0592MHz, and voltage is used DC5V.
During use, the air compressor machine controller connects three-phase supply, if connect the phase sequence mistake, then single-chip microcomputer can send warning or further control air compressor machine and shut down.Warning can alert be adjusted power supply, guarantees that machine turns to correctly, thereby reduces operating personnel's requirement, realizes robotization control simultaneously, and increases the compressor operation reliability.
Claims (4)
1. three-phase phase-sequence testing circuit; Comprise a Y type circuit; Comprise a capacitive branch, a resistance branch and a resistance in series branch road, three leading-out terminals of three branch roads are used to connect three-phase supply; Resistance in series is propped up the series connection of route two resistance and is constituted, and series connection point is used to be connected to the AD conversion port of a single-chip microcomputer.
2. a kind of three-phase phase-sequence testing circuit according to claim 1; It is characterized in that; Said resistance branch comprises first resistance (R1), and resistance in series is propped up route second resistance (R2) and constituted with the 3rd resistance (R3), and second resistance and the 3rd resistance sum equal first resistance.
3. a kind of three-phase phase-sequence testing circuit according to claim 1 is characterized in that series connection point is connected to said AD conversion port through amplifying circuit.
4. a kind of three-phase phase-sequence testing circuit according to claim 3 is characterized in that, also is provided with current-limiting resistance (R4) between series connection point and the input amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205192601U CN202486219U (en) | 2011-12-13 | 2011-12-13 | Three-phase phase sequence detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205192601U CN202486219U (en) | 2011-12-13 | 2011-12-13 | Three-phase phase sequence detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202486219U true CN202486219U (en) | 2012-10-10 |
Family
ID=46960633
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205192601U Expired - Fee Related CN202486219U (en) | 2011-12-13 | 2011-12-13 | Three-phase phase sequence detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202486219U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111426890A (en) * | 2020-04-22 | 2020-07-17 | 海信（山东）空调有限公司 | Phase sequence detection circuit, outdoor unit, air conditioner and control method |
-
2011
- 2011-12-13 CN CN2011205192601U patent/CN202486219U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111426890A (en) * | 2020-04-22 | 2020-07-17 | 海信（山东）空调有限公司 | Phase sequence detection circuit, outdoor unit, air conditioner and control method |
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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: 20121010 Termination date: 20151213 |
|
| EXPY | Termination of patent right or utility model |