CN104503529A - Thyristor single-phase voltage adjusting circuit and control method thereof - Google Patents
Thyristor single-phase voltage adjusting circuit and control method thereof Download PDFInfo
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- CN104503529A CN104503529A CN201410831164.9A CN201410831164A CN104503529A CN 104503529 A CN104503529 A CN 104503529A CN 201410831164 A CN201410831164 A CN 201410831164A CN 104503529 A CN104503529 A CN 104503529A
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Abstract
The invention relates to a thyristor single-phase voltage adjusting circuit and a control method thereof. The thyristor single-phase voltage adjusting circuit is characterized in that the arrangement of a transformer, a rectifier bridge and the like is omitted, and an alternating current bidirectional zero-crossing signal is directly detected by a photoelectric coupler, so the stability and accuracy of the voltage adjusting circuit are improved; deviation positive and negative signals required by a control algorithm are detected by an effective hardware circuit, and can be sent into a main controller in a digital way, so as to omit the conversion time of an analog to digital converter; the control algorithm adopts the phase-shift triggering, the movement direction of a triggering angle is directly determined according to the deviation positive and negative signals, and the control algorithm belongs to the closed-loop droop control; a thyristor triggering circuit of the voltage adjusting circuit can generate a strong triggering wide pulse signal, so as to guarantee the stable triggering of a thyristor. The voltage adjusting circuit and the control method have the advantages that the cost of hardware is greatly reduced, and the time is saved; the real-time property, accuracy and stability of the control system are improved, and the cost of the whole circuit is reduced.
Description
Technical field
The present invention relates to control technology field, specifically, is a kind of silicon control single phase regulating circuit and control method thereof.
Background technology
Along with the growth of the industrial electricity of China, terminal supply line condition is increasingly sophisticated, and the line voltage near substation transformer is generally higher, and voltage fluctuates with the change of supply load, especially in most cases current, line voltage is higher, and consumer can be caused often to be in overlond running state, and energy consumption increases, reliability of operation reduces, failure rate improves, and add the electric cost expenditure of user, overhaul of the equipments expense also improves thereupon.
Voltage-regulation is carried out by the regulator of user side, the need for electricity adapting to equipment is a more feasible way, at least can make the voltage stabilization of consumer under the rated voltage of nominal, further can also reduce voltage further according to the characteristic of consumer, equipment is under lower energy consumption, reaches energy-conservation effect.The method of current regulation voltage has 1, autotransformer pressure regulation; 2, silicon-controlled voltage regulation; 3, IGBT pressure regulation.Autotransformer pressure regulation ratio is easier to realize, but its voltage is that response speed is slow by switching different taps to realize.Use IGBT to carry out high frequency chopping pressure regulation, perfect sinewave output can be realized, there is feature that response speed is high equally, but its technology is more complicated, and cost is high, not easily realize the pressure regulation of larger capacity.Therefore, in above three kinds of voltage-regulating techniques, silicon-controlled voltage regulation is conventional a kind of voltage regulating mode.
Traditional silicon controlled toggle adopts analog control circuit, cannot overcome its inherent defect.Digital control circuit is compared with analog, and major advantage is that output waveform is stable and reliability is high, but its shortcoming is circuit more complicated, and when phase-shifting trigger angle is larger, control accuracy is not high.And all contain synchrotrans in the zero cross detection circuit of two kinds of control circuits, not only increase volume and the cost of control circuit, also can cause zero error.Be incorporated in regulating circuit by single-chip microcomputer in some document or patent, can partly overcome the above problems, but just can obtain zero cross signal through photoelectrical coupler again after alternating current still will be carried out rectification by zero cross detection circuit part, circuit complexity easily breaks down.In addition, take controllable silicon as the control system of performance element, especially in voltage control system, the real-time of control system and control accuracy are limited by slewing rate and the accuracy of detection of single-chip microcomputer analog to digital converter.In addition, the control algolithm of control system also causes very large time overhead.The cost performance of control system cannot reach optimum.
Summary of the invention
Technical matters to be solved by this invention is: organically combine the element circuit of existing simple function and innovate, overcoming the shortcoming of prior art, provides a kind of applicability strong, the silicon control single phase regulating circuit that cost performance is high; And providing simple and easy to do, real-time, accuracy and stability are high, the control method that cost is low.
The scheme of technical solution problem of the present invention is: a kind of silicon control single phase regulating circuit, it is characterized in that: it comprises: governor circuit respectively with zero cross detection circuit, thyristor gating circuit and the electrical connection of deviation decision circuitry, thyristor gating circuit is electrically connected with one-way SCR reverse parallel connection circuit, described zero cross detection circuit is for detecting the two-way zero-crossing signal of interchange, described deviation decision circuitry is directly compared by comparer voltage feedback signal and Setting signal, thus on hardware, draw the positive negative signal of deviation required for control algolithm, positive for deviation negative signal is directly input in control algolithm by described governor circuit, control algolithm draws controlled quentity controlled variable, master controller draws the start pulse signal synchronous with power supply signal according to described zero cross signal and controlled quentity controlled variable, start pulse signal triggers controlled silicon conducting through described thyristor gating circuit, described deviation decision circuitry draws the positive negative signal of deviation required for control algolithm, described zero cross detection circuit adopts photoelectrical coupler to detect the two-way zero-crossing signal of capable AC signal, when the positive half-wave of capable AC signal passes through, the zero cross signal that photoelectrical coupler U1 produces a positive half-wave gives main control circuit, when the negative half-wave of capable AC signal passes through, the zero cross signal that photoelectrical coupler U2 produces a negative half-wave gives main control circuit.
Described thyristor gating circuit is formed primarily of phase inverter and MOC3083.
Described main control circuit is intelligent chip or the smart circuit of integrated comparator.
A control method for silicon control single phase regulating circuit, is characterized in that, it comprises following content:
A. zero-signal is detected by zero cross detection circuit, Setting signal is set by slide rheostat, the voltage detection signal of feedback compares in hardware comparator with Setting signal, comparative result is switching value, in feeding control algolithm, control algolithm draws current phase shifting angle according to the phase shifting angle of comparative result and initial setting, and convert phase shifting angle to 0 ~ T/2 delay time, send into the timer of governor circuit, main control circuit starts timer trigger after zero cross signal being detected, time delay terminates rear master controller and sends pulse signal triggering controlled silicon conducting, T is the time that a cycle of power supply signal takies,
B. when Setting signal is greater than feedback signal, then need to increase voltage, therefore phase shifting angle needs reduction fixed value, the i.e. delay time of the timer value that needs reduction one fixing, i.e. step-length, when Setting signal is less than feedback signal, then need to reduce voltage, therefore phase shifting angle needs increase step-length;
C. the size of step-length is determined by control accuracy and regulating time two factors.
Silicon control single phase regulating circuit of the present invention eliminates the link such as synchrotrans, rectifier bridge, directly utilizes photoelectrical coupler to detect the two-way zero cross signal of alternating current, adds stability and the degree of accuracy of regulating circuit; In addition, the positive negative signal of deviation that regulating circuit utilizes effective hardware circuit to come required for detection control algorithm, the positive negative signal of deviation sends into master controller with the form of switching value, eliminates the switching time of analog to digital converter; What control algolithm adopted is phase-shifting trigger, directly decides the moving direction of Trigger Angle according to the positive negative signal of deviation; The thyristor gating circuit of regulating circuit can produce and trigger wide pulse signal by force, and can ensure that silicon controlled is stable and trigger, and not need to use pulse transformer, its applicability is strong, and cost performance is high.
The control method of silicon control single phase regulating circuit of the present invention belongs to closed loop has difference to control, greatly reduce hardware and time overhead, not only enhance the real-time of control circuit, accuracy and stability, also reduce the cost of control circuit, although the voltage exported can fluctuate regularly in the certain limit of setting value, but fluctuating range is very little, the requirement of most user can be met.
Accompanying drawing explanation
Fig. 1 is a kind of silicon control single phase regulating circuit of the present invention theory diagram;
Fig. 2 is a kind of silicon control single phase regulating circuit principle schematic of embodiment 1;
Fig. 3 is the program flow diagram of a kind of silicon control single phase regulating circuit of the present invention;
Fig. 4 is a kind of silicon control single phase regulating circuit principle schematic of embodiment 2.
In figure: 10 is zero cross detection circuits, 20 is deviation decision circuitry, and 30 is single-phase silicon-controlled reverse parallel connection circuit, and 40 is governor circuits, and 50 is thyristor gating circuits, and 60 is current detection circuits, and 601 is current transformers, and 602 is single-phase rectification bridges.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
Embodiment 1: see figures.1.and.2, a kind of silicon control single phase regulating circuit of the present invention, comprise governor circuit 40 to be electrically connected with zero cross detection circuit 10, thyristor gating circuit 50 and deviation decision circuitry 20 respectively, thyristor gating circuit 50 is electrically connected with one-way SCR reverse parallel connection circuit 30.L in described zero cross detection circuit 10 is connected to the live wire of power supply, and N is connected to the zero line of power supply.When the positive half-wave of power supply enters, the voltage that the voltage held by L is held higher than N, electric current flows through resistance R1 from L end and flows into 2 pins outflows through 1 pin of photoelectrical coupler U1 again, finally flows into N end, thus, the lumination of light emitting diode of photoelectrical coupler U1 inside.When the light emitting diode of photoelectrical coupler U1 is not luminous, 3 pins of photoelectrical coupler U1 and 4 pin not conductings, resistance R3 does not have electric current, and the level on 3 pins of therefore photoelectrical coupler U1 is high level VCC.In the present embodiment, VCC is 5V level.During the lumination of light emitting diode of photoelectrical coupler U1,3 pins of photoelectrical coupler U1 and 4 pin conductings, the level of 3 pins of photoelectrical coupler U1 close to 0V, thus produces a negative edge signal on 3 pins of photoelectrical coupler U1.In this circuit, this negative edge signal is defined as positive zero cross signal.Positive zero cross signal enters through 1 pin of over level driving chip U3, exports to the P3.2 pin of master controller U4 after driving from its 2 pin.Because now L terminal voltage is greater than N terminal voltage, this branch road is held to be open circuit so 1 pin that L holds 2 pins of resistance R2 to photoelectrical coupler U2 to arrive photoelectrical coupler U2 again arrives N again.The light emitting diode of photoelectrical coupler U2 inside is not luminous.So the level of 3 pins of photoelectrical coupler U2 is high level all the time, namely not negative zero cross signal enters.
When the negative half-wave of power supply enters, the voltage of N end is held higher than L, electric current flows through from N end 2 pins that resistance R2 flows into photoelectrical coupler U2, L end is flowed into again from 1 pin of photoelectric coupling U2, therefore, the lumination of light emitting diode of photoelectrical coupler U2 inside, 3 pins of photoelectrical coupler U2 and 4 pin conductings, the level of 3 pins of photoelectrical coupler U2 becomes low level close to 0V from high level 5V, thus produces a negative edge signal.In this circuit, this negative edge signal is defined as negative zero cross signal.Negative zero cross signal enters 3 pins of level driving chip U3, exports to the P3.3 pin of master controller U4 after driving from its 4 pin.Because now N terminal voltage is greater than L terminal voltage, so N holds 2 pins of photoelectrical coupler U1 to hold the not conducting of this section of branch road to its 1 pin to resistance R1 to L, therefore the light emitting diode of photoelectrical coupler U1 inside is not luminous, 3 pins of photoelectrical coupler U1 remain Gao Ping, namely do not have positive zero cross signal to enter.
In the present embodiment 1, described photoelectrical coupler U1 and U2 selects TLP521, described level driving chip U3 is 74LS244, described main control circuit 40 is master controller U4, and master controller U4 adopts AT89S2051, and the program flow diagram of master controller U4 as shown in Figure 3, the technology that software program is familiar with by relevant technical staff in the field, can according to Power Electronic Technique, automatic control technology, the correlation technique establishments such as computer technology.
Described deviation decision circuitry 20+and-for accessing voltage feedback signal, resistance R6 and slide rheostat RP1 two ends are added in again through electric capacity C1 filtering, suitable adjustment slide rheostat RP1, obtain the voltage signal of feedback at 3 pins of slide rheostat RP1 in proportion, then send into the P1.1 pin of master controller U4 from the positive pole of electric capacity C2 after electric capacity C2 filtering.User provides Setting signal by the resistance value arranged between 3 pins of slide rheostat RP2 and 2 pins, 5V voltage VCC is added at slide rheostat RP2 two ends, then Setting signal is become voltage signal to export from 3 pins of slide rheostat RP2, send into the P1.0 pin of master controller U4.
Described two-way can silicon trigger circuit 50 for providing trigger pip to single-phase silicon-controlled reverse parallel connection circuit 30, two-way can the A1 of silicon trigger circuit 50, K1, A2, K2 respectively with the A1 of single-phase silicon-controlled reverse parallel connection circuit 30, K1, A2, K2 is connected, master controller U4 uses its P1.6 pin and P1.7 pin to send broad pulse trigger pip, 5 pins and 10 pins that enter level driving chip U3 respectively drive, again respectively from 6 pins and the output of 9 pins of level driving chip U3, through the current limliting of resistance R7 and resistance R10, be connected with VCC with the light emitting diode of U6 inside by isolating chip U5 again.When P1.6 and P1.7 is low level, these two branch road conductings of VCC to P1.7 and VCC to P1.6, the lumination of light emitting diode of isolating chip U5 and U6 inside, the bilateral diode conducting of isolating chip U5 and U6 inside, resistance R8 and resistance R11 is shorted, the equivalent resistance of A1 to K1 and A2 to K2 reduces, and electric current increases, then single-phase silicon-controlled reverse parallel connection circuit turn-on.When P1.6 and P1.7 is high level, these two subcircuit disables of VCC to P1.7 and VCC to P1.6, the light emitting diode of isolating chip U5 and U6 inside is not luminous, the bilateral diode cut-off of isolating chip U5 and U6 inside, resistance R8 and resistance R11 has electric current to pass through, the equivalent resistance of A1 to K1 and A2 to K2 increases, and electric current reduces, then single-phase silicon-controlled reverse parallel connection circuit 30 ends.Therefore, the pulsewidth P1.6 and P1.7 of control master controller U4 exporting pulse just can control the conducting of single-phase silicon-controlled reverse parallel connection circuit 30 and closing time, thus control the output voltage of single-phase silicon-controlled reverse parallel connection circuit 30, output voltage again by Voltage Feedback+and-port feed back to deviation decision circuitry 20+and-.Described U5 and U6 is MOC3083.
Trigger circuit voltage control method is: a. is detected zero-signal by zero cross detection circuit 10, Setting signal is set by slide rheostat RP2, the voltage detection signal of feedback compares in the comparer of main control circuit 40 with Setting signal, comparative result is switching value, send in control algolithm by the register of main control circuit 40, control algolithm draws phase shifting angle according to comparative result, and convert phase shifting angle to 0 ~ T/2 delay time, send into the timer internal of main control circuit 40, main control circuit 40 starts timer trigger after zero cross signal being detected, time delay terminates rear master controller and sends pulse signal triggering controlled silicon conducting, T is the time that a cycle of power supply signal takies.In the present embodiment, T is 20ms, and namely power supply signal is industrial-frequency alternating current;
B. when Setting signal is greater than feedback signal, then need to increase voltage, therefore phase shifting angle needs reduction fixed value, the i.e. delay time of the timer value that needs reduction one fixing, i.e. step-length, when Setting signal is less than feedback signal, then need to reduce voltage, therefore phase shifting angle needs increase step-length;
C. the size of step-length is determined by control accuracy and regulating time two factors.
Embodiment 2: with reference to Fig. 4, a kind of silicon control single phase regulating circuit regulating circuit of embodiment 2 is substantially the same manner as Example 1, its difference is: between the live wire L and deviation decision circuitry 20 at controllable silicon 30 place, install a set of current detection circuit 60 additional, current transformer 601 gathers the ac current signal of L on live wire, the ac current signal obtained, then become DC current signal through rectifier bridge 602.DC current signal becomes negative voltage signal through resistance R1, and sends into after the inverting amplifier be made up of LM358 and R1, R2 carries out anti-phase amplification through electric capacity C filtering, by Voltage Feedback+and-be connected to the Voltage Feedback of deviation decision circuitry 20+and-on.
Although by above embodiment to invention has been announcement, protection scope of the present invention is not limited thereto, under the condition not departing from the present invention's design, all will fall in right of the present invention the distortion, replacement etc. that above each component does.
Claims (4)
1. a silicon control single phase regulating circuit, it is characterized in that: it comprises: governor circuit respectively with zero cross detection circuit, thyristor gating circuit and the electrical connection of deviation decision circuitry, thyristor gating circuit is electrically connected with one-way SCR reverse parallel connection circuit, described zero cross detection circuit is for detecting the two-way zero-crossing signal of interchange, described deviation decision circuitry is directly compared by comparer voltage feedback signal and Setting signal, thus on hardware, draw the positive negative signal of deviation required for control algolithm, positive for deviation negative signal is directly input in control algolithm by described governor circuit, control algolithm draws controlled quentity controlled variable, master controller draws the start pulse signal synchronous with power supply signal according to described zero cross signal and controlled quentity controlled variable, start pulse signal triggers controlled silicon conducting through described thyristor gating circuit, described deviation decision circuitry draws the positive negative signal of deviation required for control algolithm, described zero cross detection circuit adopts photoelectrical coupler to detect the two-way zero-crossing signal of capable AC signal, when the positive half-wave of capable AC signal passes through, the zero cross signal that photoelectrical coupler U1 produces a positive half-wave gives main control circuit, when the negative half-wave of capable AC signal passes through, the zero cross signal that photoelectrical coupler U2 produces a negative half-wave gives main control circuit.
2.. as claim 1 silicon control single phase regulating circuit, it is characterized in that: described thyristor gating circuit is formed primarily of phase inverter and MOC3083.
3. as claim 1 silicon control single phase regulating circuit, it is characterized in that: described main control circuit is intelligent chip or the smart circuit of integrated comparator.
4. a control method for silicon control single phase regulating circuit, is characterized in that, it comprises following content:
A. zero-signal is detected by zero cross detection circuit, Setting signal is set by slide rheostat, the voltage detection signal of feedback compares in hardware comparator with Setting signal, comparative result is switching value, in feeding control algolithm, control algolithm draws current phase shifting angle according to the phase shifting angle of comparative result and initial setting, and convert phase shifting angle to 0 ~ T/2 delay time, send into the timer of governor circuit, main control circuit starts timer trigger after zero cross signal being detected, time delay terminates rear master controller and sends pulse signal triggering controlled silicon conducting, T is the time that a cycle of power supply signal takies,
B. when Setting signal is greater than feedback signal, then need to increase voltage, therefore phase shifting angle needs reduction fixed value, the i.e. delay time of the timer value that needs reduction one fixing, i.e. step-length, when Setting signal is less than feedback signal, then need to reduce voltage, therefore phase shifting angle needs increase step-length;
C. the size of step-length is determined by control accuracy and regulating time two factors.
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| CN201410831164.9A CN104503529A (en) | 2014-12-26 | 2014-12-26 | Thyristor single-phase voltage adjusting circuit and control method thereof |
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| CN201410831164.9A CN104503529A (en) | 2014-12-26 | 2014-12-26 | Thyristor single-phase voltage adjusting circuit and control method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104836423A (en) * | 2015-05-20 | 2015-08-12 | 北华大学 | Three-phase bridge rectifier circuit silicon controlled rectifier triggering method and three-phase bridge rectifier circuit silicon controlled rectifier triggering device |
| CN111026216A (en) * | 2019-12-18 | 2020-04-17 | 国网河南省电力公司检修公司 | Station is with becoming automatic voltage regulation device |
| CN112968619A (en) * | 2021-02-23 | 2021-06-15 | 北华大学 | Trigger device and method for silicon controlled rectifier in single-phase alternating current circuit |
| CN115483916A (en) * | 2022-11-14 | 2022-12-16 | 福建顺昌虹润精密仪器有限公司 | Phase-shifting trigger controller with power regulation and power limitation |
| CN117047985A (en) * | 2023-08-03 | 2023-11-14 | 广州捷克易自动化设备有限公司 | Hot runner voltage control system and control method |
-
2014
- 2014-12-26 CN CN201410831164.9A patent/CN104503529A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104836423A (en) * | 2015-05-20 | 2015-08-12 | 北华大学 | Three-phase bridge rectifier circuit silicon controlled rectifier triggering method and three-phase bridge rectifier circuit silicon controlled rectifier triggering device |
| CN111026216A (en) * | 2019-12-18 | 2020-04-17 | 国网河南省电力公司检修公司 | Station is with becoming automatic voltage regulation device |
| CN112968619A (en) * | 2021-02-23 | 2021-06-15 | 北华大学 | Trigger device and method for silicon controlled rectifier in single-phase alternating current circuit |
| CN112968619B (en) * | 2021-02-23 | 2021-09-28 | 北华大学 | Trigger device and method for silicon controlled rectifier in single-phase alternating current circuit |
| CN115483916A (en) * | 2022-11-14 | 2022-12-16 | 福建顺昌虹润精密仪器有限公司 | Phase-shifting trigger controller with power regulation and power limitation |
| CN115483916B (en) * | 2022-11-14 | 2023-03-03 | 福建顺昌虹润精密仪器有限公司 | Phase-shifting trigger controller with power regulation and power limitation |
| CN117047985A (en) * | 2023-08-03 | 2023-11-14 | 广州捷克易自动化设备有限公司 | Hot runner voltage control system and control method |
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Application publication date: 20150408 |