CN102364796B - Voltage and phase sequence protection circuit - Google Patents
Voltage and phase sequence protection circuit Download PDFInfo
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- CN102364796B CN102364796B CN 201110307469 CN201110307469A CN102364796B CN 102364796 B CN102364796 B CN 102364796B CN 201110307469 CN201110307469 CN 201110307469 CN 201110307469 A CN201110307469 A CN 201110307469A CN 102364796 B CN102364796 B CN 102364796B
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Abstract
The invention discloses a voltage and phase sequence protection circuit, which comprises a voltage sampling part and a logic control output part, wherein the voltage sampling part consists of two groups of circuits of which each comprises a voltage transformer and a sampling conversion circuit unit; and the logic control output part comprises a microchip module, a resetting circuit module, an oscillating circuit module and an output circuit module. The circuit further comprises a power circuit module and a communication circuit module. The voltage and phase sequence protection circuit provided by the invention simultaneously realizes voltage and phase detection, improves circuit sensitivity, simplifies a circuit structure, can work independently of an independent external power supply due to structural improvements in the power circuit module, and also can be conveniently connected with other control systems for intelligent control by the communication circuit module, so functions and application modes of the circuit are expanded.
Description
Technical field
The present invention relates to a kind of protective circuit, be specifically related to a kind of voltage for the three-phase electricity motor and phase sequence protection circuit.
Background technology
Along with expanding economy; motor is widely applied in all trades and professions as a kind of electric power and power resources; therefore many products for electric motor protecting have also been derived; simply as thermal relay etc.; the real protection curve of the operation curve of thermal relay work and motor is also inconsistent, thereby has lost protective effect.
In recent years along with the development of technology; some new protective circuits appear; the phase sequence relay circuit of typical capacitance-resistance moving type as shown in Figure 1; its operation principle is for to carry out phase shift to the three-phase voltage phase place, and the circuit after phase shift is superimposed upon on relay R Y, when phase place is normal; relay R Y adhesive; contact 7,8 is connected, and when phase anomaly when phase shortage (anti-phase or) the upper voltage of relay R Y is not enough to make its adhesive, contact 7,8 disconnects.Its design feature main circuit is simple. and can realize phase shortage and reverse-phase protection, shortcoming is to realize detecting the functions such as phase (R phase/S phase), Voltage unbalance, overtension and too low protection.
Summary of the invention
The invention provides a kind of voltage and phase sequence protection circuit, under common environment for use, can judge the state of three phase mains, protection motor or other devices are not damaged. can provide communication by other control circuits in case of necessity.
For achieving the above object, the present invention is achieved through the following technical solutions:
A kind of voltage and phase sequence protection circuit comprise voltage sampling part, logic control output, and wherein said voltage sampling part is by two groups of the electric circuit constitutes, and every group of circuit comprises:
One voltage transformer from the alternate lead-out wire voltage of three-phase high-voltage two, is converted to the low tension signal with the three-phase high-voltage signal of telecommunication; To those skilled in the art, obviously can realize from lead-out wire voltage between three-phase electricity, normally any two-phase with three-phase electricity is linked in voltage sensor.
The sample conversion circuit unit, its input connects the output of described voltage sensor module, and the low tension signal is converted to voltage analog signal and pulse electrical signal;
Described logic control partly comprises:
The microchip module is used for voltage analog signal and the pulse electrical signal of the output of sample conversion circuit module are carried out the logic analysis judgement, produces control signal and exports through output;
The reset circuit module, the initialize signal that provides microchip to start wakes microchip work up;
The oscillating circuit module provides microchip to calculate required oscillation pulse signal;
Output circuit module, its input connect microchip module output, the break-make of control load.
In voltage of the present invention and phase sequence protection circuit; the sample conversion circuit unit is output voltage analog signal and pulse electrical signal simultaneously; described pulse electrical signal show as on electrical properties high level with low level as digital phase place mutually; thereby realized that voltage sample detects and the phase sample detection unites two into one; reduced the complexity of circuit; simplify circuit structure, improved operating efficiency.
In voltage of the present invention and phase sequence protection circuit, the sample conversion circuit unit comprises rectification circuit module and comparison circuit module, and same passage is adopted in the input of the phase sequence sampling of the voltage sample of rectification circuit module and comparison circuit module:
The input of rectification circuit module receives the low voltage signal of described voltage sensor output, detects change in voltage, and is output as analog voltage signal and provides microchip to carry out the voltage judgement;
The comparison circuit module input connects the output of described rectification circuit module, detect rising and the decline of output voltage, and corresponding signal is risen and decline converts high level signal and low level signal to, and be output as digital phase phase signal and provide microchip to carry out the phase place judgement.
in voltage of the present invention and phase sequence protection circuit, do not limit concrete rectification circuit module, comparison circuit Model Implement method, as long as it has realized that above-mentioned functions can detect voltage and phase place changes, thereby producing analog voltage signal gets final product with digital phase signal mutually, consider easily for cost and realization, in voltage of the present invention and phase sequence protection circuit, preferably, the rectification circuit module is a voltage stabilizing didoe, described comparison circuit module is a voltage comparator, described voltage comparator is connected with the output of voltage stabilizing didoe by a resistance, rising and decline by ohmically voltage detecting output voltage.
Voltage of the present invention and phase sequence protection circuit operation principle are: the detection input of three-phase electricity, arrive secondary side with electric signal transmission, then produce voltage analog signal after diode rectification after voltage sensor step-down and isolation; When the signal ascent stage; to make the output of voltage comparator produce a high level signal with the voltage that produces on resistance that comparator is connected; otherwise will make during the stage when voltage drop and be output as low level. the AD conversion mouth of the two-way analog voltage signal being sent into the microchip module carries out voltage transitions, thereby send middle fracture to carry out the phase place judgement as digital phase phase signal two high-low level switching signals that voltage comparator produces. through the microchip module judge three-phase electricity voltage, phase place whether normal after the realization of output control signal to the protection of circuit.
In voltage of the present invention and phase sequence protection circuit, in order to improve the order of accuarcy of voltage judgement, described rectification circuit module also is connected with filter circuit module, and described filter circuit module is used for filtering the clutter of rectification circuit module output signal.As is known to the person skilled in the art, the filter membrane circuit module can adopt multiple circuit element to realize, preferably electrochemical capacitor.
In voltage of the present invention and phase sequence protection circuit, the microchip module also is connected with the power circuit module, and the power circuit module is used for providing microchip work necessary electric energy.In voltage of the present invention and phase sequence protection circuit; power circuit module used can be both the outside external power supply from whole circuit; also can adopt circuit self as the mode of power supply supply; preferably; the power circuit module provides for the low voltage signal of the described voltage sensor output rectified signal via the rectification circuit module of sample conversion circuit unit; thereby realized the only power supply of order in addition, circuit structure is compact.
In voltage of the present invention and phase sequence protection circuit, the reset circuit module is provided with a reset terminal, and described reset terminal is provided with reset button, is used for carrying out the reset operation of microchip module.
Further, in voltage of the present invention and phase sequence protection circuit, the microchip module also is connected with communication circuit module; signal and port with other controller communications are provided; realization is connected and control with other control system, thereby has enriched the function of circuit of the present invention, makes it be easy to expansion.
Voltage of the present invention and phase sequence protection circuit by adopting voltage transformer, can accurately detect change in voltage; Same passage is adopted in input by voltage sample and phase sequence sampling, thereby can be output as simultaneously the judgement of analog voltage signal voltage supplied, is output as digital signal for the phase place judgement; For analog voltage signal, can be by setting a zero point, unified crawl data when zero crossing when sampling. the sampling error of avoiding voltage fluctuation to bring; For digital phase phase sample, in the mode of charging interval section sampling, due to the same passage that is input as of itself and voltage sample, relative position is consistent, can realize phase-detection, thereby realizing that two parts are adopted produces uniting two into one of sample circuit, improve the sensitivity of circuit, simplified circuit structure.
Further; architecture advances by power module; voltage of the present invention and phase sequence protection circuit can not rely on independent external power supply can carry out work; and can facilitate and the interconnected Based Intelligent Control that realizes of other control system by communication circuit module, expanded the function and application mode of circuit.
Description of drawings
Fig. 1 is the phase sequence relay circuit structure diagram of existing capacitance-resistance moving type;
Fig. 2 is the fundamental diagram of voltage of the present invention and phase sequence protection circuit;
Accompanying drawing 3 is the structured flowchart of voltage of the present invention and phase sequence protection circuit;
Accompanying drawing 4a is the voltage sampling part-structure figure of voltage of the present invention and phase sequence protection circuit;
Accompanying drawing 4b is microchip module, the oscillating circuit modular structure figure of voltage of the present invention and phase sequence protection circuit;
Accompanying drawing 4c is the output circuit modular structure figure of voltage of the present invention and phase sequence protection circuit;
Accompanying drawing 4d is the reset circuit modular structure figure of voltage of the present invention and phase sequence protection circuit.
Embodiment
With reference to accompanying drawing 2,3, operation principle and the structure of voltage of the present invention and phase sequence protection circuit module are disclosed, comprise voltage sampling part, logic control output, described voltage sampling part is by two groups of the electric circuit constitutes, every group of circuit comprises a voltage transformer, from the alternate lead-out wire voltage of three-phase high-voltage two, the three-phase high-voltage signal of telecommunication is converted to the low tension signal; A sample conversion circuit unit, its input connects the output of described voltage sensor module, and the low tension signal is converted to voltage analog signal, pulse electrical signal, and described pulse electrical signal is as digital phase phase signal; Each sample conversion circuit unit comprises a rectification circuit module and a comparison circuit module, wherein same passage is adopted in the input of the phase sequence of the voltage sample of rectification circuit module and comparison circuit module sampling, the input of described rectification circuit module receives the low voltage signal of described sensor assembly output, detect change in voltage, and be output as analog voltage signal and provide microchip to carry out the voltage judgement; Described comparison circuit module input connects the output of described rectification circuit module, detect rising and the decline of output voltage, and corresponding signal is risen and decline converts high level signal and low level signal to, and be output as digital phase phase signal and provide microchip to carry out the phase place judgement.
Described logic control partly comprises:
The microchip module is used for voltage analog signal and the pulse electrical signal of the output of sample conversion circuit module are carried out the logic analysis judgement, produces control signal through output output (being defined as logic control circuit with function in Fig. 3);
The reset circuit module, the initialize signal that provides microchip to start wakes microchip work up;
The oscillating circuit module provides microchip to calculate required oscillation pulse signal;
Output circuit module, its input connect microchip module output, the break-make of control load.
Wherein, the microchip module also is connected with power circuit module and communication circuit module, for it provides the communication of electric energy and realization and other control system.
with reference to figure 4, a kind of specific implementation of voltage of the present invention and phase protection circuit is disclosed, 3PH_R, 3PH_S, 3PH_T is respectively the detection input of three-phase electricity, through VT400, after two voltage sensor step-downs of VT401 and isolation, electric signal transmission is arrived secondary side, again after diode D400/D401 rectification, C401/C403 is charged, and produce voltage analog signal at the V0/V1 point, when the signal ascent stage, the voltage of the upper generation of R402/R408 will make the output S0/S1 of voltage comparator U400A/U400B produce a high level signal, otherwise will make S0/S1 be output as low level during the stage when voltage drop. the AD conversion mouth of V0/V1 being sent into microchip carries out voltage transitions, and send middle fracture to carry out the phase place judgement two switching signals of S0/S1. judge through chip logic, to produce control signal and control the OUT output, make Q1 conducting or judgement. to realize the defencive function to motor or other equipment.
Wherein the concrete connected mode of each element is (R represents that resistance, IC represent that chip, C represent that electric capacity, RESET representative resets, CRY oscillation signal generator, VCC circuit module power supply access, GND earth terminal, D diode, U comparator, Q switching):
D1 negative pole, R2 are connected with VCC, and the D1 positive pole is connected with R2, C3, R3, and R3 is connected with the RESET pin of IC.CON1 and GND, VCC, MODE, RESET is connected, 1 of CRY1, 3 pin are connected with R1 and OSC1 again, OSC2 is connected, and 2 pin of CRY1 are connected with GND, and 1 pin of U1 is connected with VCC, 2 pin of U1 are connected with OUT, 3 pin of U1 are connected with R2, and R2 is connected with 3 pin of R4 and Q1, and 1 pin of Q1 is connected with 4 pin of U1,2 pin of Q1 are connected with CN2, R3 is connected with C1, and R3 is connected with 1 pin of Q1, and C3 is connected with 2 pin of Q1, R4 is connected with 2 pin of Q1, ZNR400 and input 1, 1 of output 2 and VT400, 2 are connected, ZNR401 and input 2, 1 of output 3 and VT401, 2 are connected, 3 of VT400, 4 are connected with R403,3 of VT401, 4 are connected with R411, and 1 pin of R401 is connected with the positive pole of D400, D400 negative pole and R401, R402, R405 is connected, and 2 pin of R401 are connected with 3 pin of U400, and 2 pin of R402 are connected with 2 pin of U400, and 2 pin of R405 are connected with GND, R404, C400, be connected between 2 pin and GND of U400 1 of R400 and U400 after the C401 parallel connection, 4 pin are connected, and 1 pin of U400 is output as Z0.
1 pin of R407 is connected with the positive pole of D400, the D400 negative pole is connected with R407, R408, R411,2 pin of R407 are connected with 5 pin of U400,2 pin of R408 are connected with 6 pin of U400,2 pin of R411 are connected with GND, be connected in after R402, C403, C410 parallel connection between 6 pin and GND of U400, R407 is connected with 4,7 pin of U400, and 7 pin of U400 are output as Z1.
Above embodiment, and non-limiting protection scope of the present invention only are used for illustrating a kind of specific implementation of the present invention.Those skilled in the art change to realize identical or similar function to wherein parts, element etc. understanding on the basis of connotation of the present invention; or use the similar or identical electric elements of other specifications instead, still belong to protection scope of the present invention.Protection scope of the present invention is covered by its claim and equivalents thereof.
Claims (9)
1. a voltage and phase sequence protection circuit, comprise voltage sampling part, logic control output,
It is characterized in that:
Described voltage sampling part is by two groups of the electric circuit constitutes, and every group of circuit comprises:
One voltage transformer module from the alternate lead-out wire voltage of three-phase high-voltage two, is converted to the low tension signal with the three-phase high-voltage signal of telecommunication;
The sample conversion circuit unit, its input connects the output of described voltage transformer module, and the low tension signal is converted to voltage analog signal, pulse electrical signal, and described pulse electrical signal is as digital phase phase signal;
Described logic control output comprises:
The microchip module is used for voltage analog signal and the pulse electrical signal of the output of sample conversion circuit module are carried out the logic analysis judgement, produces control signal and exports through output;
The reset circuit module, the initialize signal that provides the microchip module to start wakes the work of microchip module up;
The oscillating circuit module provides the microchip module to calculate required oscillation pulse signal;
Output circuit module, its input connect microchip module output, the break-make of control load;
Wherein, described sample conversion circuit unit comprises rectification circuit module and comparison circuit module, same passage is adopted in the input of the phase sequence sampling of the voltage sample of described rectification circuit module and comparison circuit module, the input of described rectification circuit module receives the low voltage signal of described voltage transformer module output, detect change in voltage, and be output as analog voltage signal and provide the microchip module to carry out the voltage judgement; Described comparison circuit module input connects the output of described rectification circuit module, detect rising and the decline of output voltage, and corresponding signal is risen and decline converts high level signal and low level signal to, and be output as digital phase phase signal and provide the microchip module to carry out the phase place judgement.
2. voltage according to claim 1 and phase sequence protection circuit; it is characterized in that described rectification circuit module is a voltage stabilizing didoe; described comparison circuit module is a voltage comparator; described voltage comparator is connected with the output of voltage stabilizing didoe by a resistance, by rising and the decline of ohmically voltage detecting output voltage.
3. voltage according to claim 1 and 2 and phase sequence protection circuit, is characterized in that described rectification circuit module also is connected with filter circuit module, and described filter circuit module is used for filtering the clutter of rectification circuit module output signal.
4. voltage according to claim 3 and phase sequence protection circuit, is characterized in that described filter circuit module is electrochemical capacitor.
5. voltage according to claim 1 and phase sequence protection circuit, is characterized in that described microchip module is connected with the power circuit module, and described power circuit module provides the work of microchip module necessary electric energy.
6. voltage according to claim 5 and phase sequence protection circuit is characterized in that described power circuit module provides for the low voltage signal of the described voltage transformer module output rectified signal via the rectification circuit module of sample conversion circuit unit.
7. voltage according to claim 1 and phase sequence protection circuit, is characterized in that described microchip module also is connected with communication circuit module, and signal and port with other controller communications are provided, and realizes and being connected and control of other control system.
8. voltage according to claim 1 and phase sequence protection circuit, is characterized in that described reset circuit module is provided with a reset terminal, and described reset terminal is provided with reset button, is used for carrying out the reset operation of microchip module.
9. voltage according to claim 1 and phase sequence protection circuit, the analog voltage signal of described sample conversion circuit unit is by setting a zero point, unified crawl data when zero crossing; The digital phase phase sample of described sample conversion circuit unit adopts the mode with charging interval section sampling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110307469 CN102364796B (en) | 2011-10-10 | 2011-10-10 | Voltage and phase sequence protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110307469 CN102364796B (en) | 2011-10-10 | 2011-10-10 | Voltage and phase sequence protection circuit |
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| Publication Number | Publication Date |
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| CN102364796A CN102364796A (en) | 2012-02-29 |
| CN102364796B true CN102364796B (en) | 2013-05-15 |
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| CN 201110307469 Expired - Fee Related CN102364796B (en) | 2011-10-10 | 2011-10-10 | Voltage and phase sequence protection circuit |
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| CN111556626A (en) * | 2020-05-25 | 2020-08-18 | 范云鹰 | Method for safely and effectively reducing power consumption of street lamp |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4333050A (en) * | 1980-02-26 | 1982-06-01 | Yeasting Maynard C | Multiphase voltage monitor |
| CN2596659Y (en) * | 2002-12-26 | 2003-12-31 | 郭树 | Three phase power constant phase sequence protector |
| CN201388044Y (en) * | 2009-04-07 | 2010-01-20 | 丹东国通电子元件有限公司 | Motor phase sequence protector |
| CN201541118U (en) * | 2009-10-19 | 2010-08-04 | 钟凯舰 | Three-phase power protecting device of power load |
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