CN204116442U - A kind of three-phase electricity voltage zero-cross pick-up unit for Electronic Soft Starter - Google Patents
A kind of three-phase electricity voltage zero-cross pick-up unit for Electronic Soft Starter Download PDFInfo
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- CN204116442U CN204116442U CN201420580643.3U CN201420580643U CN204116442U CN 204116442 U CN204116442 U CN 204116442U CN 201420580643 U CN201420580643 U CN 201420580643U CN 204116442 U CN204116442 U CN 204116442U
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Abstract
A kind of three-phase electricity voltage zero-cross pick-up unit for Electronic Soft Starter, it is characterized in that, the first zero cross detection circuit, the second zero cross detection circuit, the 3rd zero cross detection circuit that comprise three-phase supply, be connected respectively with 3 output terminals A, B, C of three-phase supply, the output terminal IN-A of the first zero cross detection circuit, the output terminal IN-B of the second zero cross detection circuit are delivered to the input end of the second XOR gate after the first XOR gate together with the output terminal IN-C of the 3rd zero cross detection circuit; First, second, third zero cross detection circuit has identical circuit structure and identical component parameter; First zero cross detection circuit comprises current-limiting resistance R1, resistance R3, pull-up resistor R4, high-speed photoelectric coupler, the phase inverter of two series connection, electric capacity C2, C3, power supply VCC; The utility model effectively can detect voltage over zero, and because adopting high speed photo coupling and phase inverter, this circuit has stronger anti-industrial noise ability.
Description
Technical field
The utility model relates to Aulomatizeted Detect field, and the three-phase electricity voltage zero-cross particularly related to for Electronic Soft Starter detects detection field.
Background technology
Threephase asynchronous machine is a kind of counter voltage load, and starting back-emf when starting is zero, and dash current is very large.When capacity motor is larger, dash current can cause larger interference to electrical network and load thereof, even endangers the security of operation of electrical network time serious.Motor soft starter is a kind of New-type electric machine control device integrating electric machine soft starting, soft stop and multi-protective function, can reduce starting current to the impact of electrical network when electric motor starting, extends electrical machinery life.It is one of gordian technique of Electronic Soft Starter that three-phase electricity voltage zero-cross detects, also be the basis of thyristor voltage regulation circuit, be the reference point of each time point of IGBT group conducting, in order to avoid cause false triggering, in whole Electronic Soft Starter design, there is very important effect.But the testing circuit major part that tradition uses adopts transformer pressure-reducing to extract the signals such as zero passage, and the phase offset that this mode exists zero cross signal is serious, and interference free performance is poor, inapplicable when more severe for industry control external environment.
Utility model content
For the problems referred to above, the utility model proposes a kind of three-phase electricity voltage zero-cross pick-up unit for Electronic Soft Starter.
The technical solution of the utility model is:
A kind of three-phase electricity voltage zero-cross pick-up unit for Electronic Soft Starter, it is characterized in that, the first zero cross detection circuit, the second zero cross detection circuit, the 3rd zero cross detection circuit that comprise three-phase supply, be connected respectively with 3 output terminals A, B, C of three-phase supply, the output terminal IN-A of the first zero cross detection circuit, the output terminal IN-B of the second zero cross detection circuit are delivered to the input end of the second XOR gate after the first XOR gate together with the output terminal IN-C of the 3rd zero cross detection circuit;
First, second, third zero cross detection circuit has identical circuit structure and identical component parameter;
First zero cross detection circuit comprises current-limiting resistance R1, resistance R3, pull-up resistor R4, high-speed photoelectric coupler, the phase inverter of two series connection, electric capacity C2, C3, power supply VCC; The output terminal of three-phase supply is connected with the input end IN+ of high-speed photoelectric coupler through current-limiting resistance R1, and the output terminal VOUT of high-speed photoelectric coupler is connected to form output terminal IN-A through the inverter series of 2 series connection; The pin VB of high-speed photoelectric coupler is connected to ground through resistance R3; The output terminal VOUT of high-speed photoelectric coupler is connected with pull-up resistor R4.
Further, diode D1 is connected with between high-speed photoelectric coupler pin IN-and pin IN+.
Further, low-pass filter is connected with between the output terminal VOUT of high-speed photoelectric coupler and inverter input.
Further, high-speed photoelectric coupler model is 6N139.
The design adopts high speed photo coupling, phase inverter, NOR gate circuit and a small amount of resistance, electric capacity, diode form multistep sequential circuit to carry out the extraction of three-phase mains voltage zero cross signal, effectively can detect voltage over zero, because adopting high speed photo coupling and phase inverter, this circuit has stronger anti-industrial noise ability.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the circuit diagram of zero cross detection circuit;
Fig. 3 is the circuit diagram of gate circuit;
Electric current sequential chart when Fig. 4 is system cloud gray model.
Embodiment
The technological means realized to make the utility model, creation characteristic, reaching object and effect is easy to understand, below in conjunction with diagram and specific embodiment, setting forth the utility model further.
As shown in Figure 1, a kind of three-phase electricity voltage zero-cross pick-up unit for Electronic Soft Starter, comprise the first zero cross detection circuit, the second zero cross detection circuit, the 3rd zero cross detection circuit that are connected respectively with 3 of three-phase supply output terminals A, B, C, the output terminal IN-A of the first zero cross detection circuit, the output terminal IN-B of the second zero cross detection circuit are delivered to the input end of the second XOR gate after the first XOR gate together with the output terminal IN-C of the 3rd zero cross detection circuit.
First, second, third zero cross detection circuit has identical circuit structure and identical component parameter.
As shown in Figure 2, zero cross detection circuit comprises the 74LS14 phase inverter of current-limiting resistance R1, high-speed photoelectric coupler 6N139, two series connection; Current-limiting resistance R1 one end is connected with the output terminal of three-phase supply, and the other end is connected with the input end IN+ of high speed photo coupling high-speed photoelectric coupler 6N139, and R1 plays metering function, for the protection of 6N139 in order to avoid damage; Be connected with diode D1 between high-speed photoelectric coupler 6N139 pin IN-and pin IN+, D1 for the formation of simulation neutral point, during to make R1 side for positive voltage, thus conducting 6N139, to form corresponding pulse at 6N139 outgoing side.
High-speed photoelectric coupler 6N139 plays a part the AC power of input to become pulse signal, and is isolated by constrained input.The output terminal VOUT of high-speed photoelectric coupler 6N139 is connected with two 74LS14 inverter series through resistance R5, and the pulse signal that the phase inverter 74LS14 of two series connection is used for 6N139 exports carries out further shaping output.
Be connected with electric capacity C1 between the input end of phase inverter 74LS14 and ground, electric capacity C1 and resistance R5 forms low-pass filter, thus the undesired signal of filter out power side.Be connected with pull-up resistor R4 between resistance R5 and VOUT, pull-up resistor R4 is the saturation pulse signal of 0-VCC for the formation of amplitude.
For meeting the normal work of high-speed photoelectric coupler 6N139, be also provided with C2, R3 and C3 for forming corresponding application circuit with 6N139, to reach the function of 6N139.
Be the gate circuit circuit diagram be made up of the first XOR gate, the second XOR gate as shown in Figure 3, XOR gate adopts 74HC86.
Principle of work of the present utility model is as follows: R1 side applied signal voltage is timing, then 6N139 conducting, then output terminal is low level.When applied signal voltage is for time negative, 6N139 by, then 74LS14 input side is close to the high level of VCC, and the output terminal of whole circuit be voltage is VCC.Thus on the left of R1, inputting a certain cross streams signal of three-phase supply, the output terminal of whole circuit then exports corresponding pulse signal.
A, B and C phase of three-phase supply is connected to three same first, second, third zero cross detection circuits, it outputs signal the IN-A be respectively in Fig. 4 accordingly, IN-B and IN-C, then these three output signals are connected to the input end of first, second the XOR gate 74HC86 in Fig. 3,74HC86 side exports 3 frequency-doubled signals of Wei Yuan mono-road signal, this signal is inputed to the INT1 interrupt pin of the controller of Electronic Soft Starter.When rising edge or negative edge being detected at every turn, all can produce interruption, then the IN-A of controller again in query graph 4, the state of IN-B and IN-C, to determine a certain phase zero passage in A/B/C three-phase.
More than show and describe ultimate principle of the present utility model, principal character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope, the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.
Claims (4)
1. the three-phase electricity voltage zero-cross pick-up unit for Electronic Soft Starter, it is characterized in that, the first zero cross detection circuit, the second zero cross detection circuit, the 3rd zero cross detection circuit that comprise three-phase supply, be connected respectively with 3 output terminals A, B, C of three-phase supply, the output terminal IN-A of the first zero cross detection circuit, the output terminal IN-B of the second zero cross detection circuit are delivered to the input end of the second XOR gate after the first XOR gate together with the output terminal IN-C of the 3rd zero cross detection circuit;
First, second, third zero cross detection circuit has identical circuit structure and identical component parameter;
First zero cross detection circuit comprises current-limiting resistance R1, resistance R3, pull-up resistor R4, high-speed photoelectric coupler, the phase inverter of two series connection, electric capacity C2, C3, power supply VCC; The output terminal of three-phase supply is connected with the input end IN+ of high-speed photoelectric coupler through current-limiting resistance R1, and the output terminal VOUT of high-speed photoelectric coupler is connected to form output terminal IN-A through the inverter series of 2 series connection; The pin VB of high-speed photoelectric coupler is connected to ground through resistance R3; The output terminal VOUT of high-speed photoelectric coupler is connected with pull-up resistor R4.
2. a kind of three-phase electricity voltage zero-cross pick-up unit for Electronic Soft Starter according to claim 1, is characterized in that, be connected with diode D1 between high-speed photoelectric coupler pin IN-and pin IN+.
3. a kind of three-phase electricity voltage zero-cross pick-up unit for Electronic Soft Starter according to claim 1, is characterized in that, be connected with low-pass filter between the output terminal VOUT of high-speed photoelectric coupler and inverter input.
4. a kind of three-phase electricity voltage zero-cross pick-up unit for Electronic Soft Starter according to claim 1, it is characterized in that, high-speed photoelectric coupler model is 6N139.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420580643.3U CN204116442U (en) | 2014-10-09 | 2014-10-09 | A kind of three-phase electricity voltage zero-cross pick-up unit for Electronic Soft Starter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420580643.3U CN204116442U (en) | 2014-10-09 | 2014-10-09 | A kind of three-phase electricity voltage zero-cross pick-up unit for Electronic Soft Starter |
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| Publication Number | Publication Date |
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| CN204116442U true CN204116442U (en) | 2015-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420580643.3U Expired - Fee Related CN204116442U (en) | 2014-10-09 | 2014-10-09 | A kind of three-phase electricity voltage zero-cross pick-up unit for Electronic Soft Starter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105048830A (en) * | 2015-08-25 | 2015-11-11 | 南京工程学院 | Three-phase AC voltage regulation digital control device and control method |
| CN106124838A (en) * | 2016-08-30 | 2016-11-16 | 苏州欧姆尼克新能源科技有限公司 | The three-phase zero cross detection circuit of photovoltaic DC-to-AC converter and detection method |
-
2014
- 2014-10-09 CN CN201420580643.3U patent/CN204116442U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105048830A (en) * | 2015-08-25 | 2015-11-11 | 南京工程学院 | Three-phase AC voltage regulation digital control device and control method |
| CN106124838A (en) * | 2016-08-30 | 2016-11-16 | 苏州欧姆尼克新能源科技有限公司 | The three-phase zero cross detection circuit of photovoltaic DC-to-AC converter and detection method |
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Legal Events
| Date | Code | Title | Description |
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| 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: 20150121 Termination date: 20201009 |
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| CF01 | Termination of patent right due to non-payment of annual fee |