CN102244510A - Trigger energy saving apparatus and thyristor switch - Google Patents
Trigger energy saving apparatus and thyristor switch Download PDFInfo
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- CN102244510A CN102244510A CN2011101415075A CN201110141507A CN102244510A CN 102244510 A CN102244510 A CN 102244510A CN 2011101415075 A CN2011101415075 A CN 2011101415075A CN 201110141507 A CN201110141507 A CN 201110141507A CN 102244510 A CN102244510 A CN 102244510A
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Abstract
The invention, which belongs to the electric switch field, discloses a trigger energy saving apparatus and a thyristor switch, and especially a trigger energy saving apparatus applied in a thyristor switch trigger loop triggered by a transformer and the thyristor switch which comprises the trigger energy saving apparatus. In the invention, the trigger energy saving apparatus triggers the thyristor to be conducted only under a condition that voltage values across two ends of a thyristor are greater than the value of a thyristor conduction voltage drop. A thyristor trigger control signal is immediately closed after the thyristor conducts so that energy consumption of triggering signals can be substantially reduced, temperature rise of a control circuit can be reduced and reliability of the control circuit can be raised. In the thyristor switch comprising the trigger energy saving apparatus, because of the low energy consumption of the thyristor trigger drive, a pulse signal frequency and pulse signal duty cycle of the trigger transformer can be raised, or rectification is performed on an output signal of the trigger transformer and capacitive stored energy is given to a thyristor control terminal through the trigger energy saving apparatus. The thyristor switch possesses the following advantages of low trigger energy consumption, good conduction linearity, little harmonic wave amount and high reliability.
Description
Technical field
The present invention triggers energy saver and thyristor switch belongs to the electric switch field, particularly a kind of thyristor switch that is applicable to that transformer triggers trigger the triggering energy saver used in the loop and a kind ofly trigger that energy consumption is extremely low, good linearity, thyristor switch that the little reliability of generation harmonic content is high.
Background technology
At present in electric power need be to the load frequent fling-cut system, be extensive use of thyristor switch to resistive, perception or capacitive load are carried out switching, in order to guarantee the electrical isolation of control circuit and major loop, generally be that control circuit provides the continuous impulse triggering signal to trigger thyristor conducting (as shown in Figure 1) by triggering transformer, for considering that the control circuit energy consumption reaches the triggering transformer greatly and is unlikely to saturated for a long time under the big current work state of high frequency, it generally designs in pulsewidth 30 left and right sides microseconds, duty ratio is to work under 1/3 the condition, calculate by 30 microseconds at this: 1.414 * 380 * SIN (2 * 3.14 * 50 * 0.00003 * 2)=10V, hence one can see that in the AC power system of 380V/50HZ, it will could reliably trigger (annotate: this has certain randomness) about thyristor both end voltage 10V, make the thyristor output current wave linear poor, can produce bigger harmonic pollution, in control circuit control thyristor conduction period, no matter whether thyristor conducting or do not possessed the condition of triggering and conducting, triggering transformer still need provide the control mode of continuous trigger signal to thyristor (to annotate: in case the thyristor triggering and conducting, triggering signal can be closed fully, and the triggered time only needs the microsecond level), equally also exist and cause unnecessary energy consumption waste, make control circuit exist power supply capacity to want big, volume increases, the shortcoming that caloric value is big, and the also easy aged deterioration of electronic devices and components under the big electric current hot conditions of high frequency of working long hours.
Summary of the invention
The objective of the invention is to avoid the weak point of existing thyristor switch and provide that a kind of circuit is simple, cost is low, reliability is high and can be convenient in range transformer triggers the thyristor switch triggering loop of control thyristor conducting, use, make the triggering energy saver that triggering energy power consumption reduces greatly, and a kind ofly trigger that energy consumption is low, good linearity, the generation harmonic content is little, reliability is high thyristor switch.
Realization the objective of the invention is to reach by the following technical programs, a kind of triggering energy saver, and it comprises:
Voltage detecting circuit;
Electronic switch, the control end of described electronic switch is connected with the output of described voltage detecting circuit, and described electronic switch is connected in the triggering loop that will control thyristor, and the input of described voltage detecting circuit is connected with described thyristor.
A kind of triggering energy saver, the input signal that it is characterized in that described triggering energy saver is a pulse signal.
A kind of triggering energy saver, the input signal that it is characterized in that described triggering energy saver is a dc signal.
A kind of triggering energy saver is characterized in that described electronic switch utilizes transistor as switch element, and described transistor is triode or Darlington transistor.
A kind of triggering energy saver, it is characterized in that described voltage detecting circuit comprises current-limiting resistance, diode, triode, the input series connection of described current-limiting resistance, described diode, described triode, the two ends of described series loop are connected with described thyristor two ends, and described triode output is connected with described electronic switch controling end.
A kind of triggering energy saver is characterized in that described voltage detecting circuit has two-way, and the described voltage detecting circuit of two-way is formed a window voltage comparator.
A kind of thyristor switch that triggers energy saver that includes, it is characterized in that, it also comprises: control circuit, triggering transformer, rectification circuit, thyristor, described control circuit is connected with working power and control input end mouth, described control circuit is connected with described triggering transformer, described triggering transformer is connected with described triggering energy saver by rectification circuit, and described triggering energy saver is connected with described thyristor.
A kind of thyristor switch is characterized in that described control circuit is built-in with microcontroller.
A kind of thyristor switch is characterized in that described microcontroller is connected with controlled cut-off device, and described controlled cut-off device is connected in the mouth loop, described control input end.
A kind of thyristor switch is characterized in that described controlled cut-off device is a photoelectrical coupler.
A kind of thyristor switch, it is characterized in that described thyristor two ends are connected with voltage zero-crossing detection circuit, described voltage zero-crossing detection circuit comprises photoelectrical coupler, instrument transformer and current-limiting resistance, described photoelectrical coupler input and described instrument transformer input are connected with described current-limiting resistance, described series loop is connected to described thyristor two ends, and the output of described photoelectrical coupler and the output of described instrument transformer are connected to described control circuit.
A kind of thyristor switch is characterized in that described rectification circuit is connected with storage capacitor.
A kind of thyristor switch is characterized in that described triggering energy saver is connected with photoelectrical coupler, and described photoelectrical coupler control end is connected with described control circuit.
A kind of thyristor switch is characterized in that described triggering transformer is non-Industrial Frequency Transformer.
A kind of thyristor switch is characterized in that described control circuit is connected with temperature sensor, control fan output port and is used to control described thyristor switch bypass contactor output port.
Its operation principle: trigger the energy saver input and be connected with triggering signal, when detecting the thyristor both end voltage greater than certain voltage, (annotates: be greater than the thyristor conducting voltage and fall) voltage detecting circuit that is connected with thyristor, by the conducting of voltage detecting circuit control electronic switch, thyristor obtains the triggering signal conducting, the thyristor both end voltage reduces after the thyristor conducting, voltage detecting circuit control electronic switch cuts out, and finishes thyristor triggering and conducting process.
The present invention is reasonable in design, trigger energy saver, it comprises: voltage detecting circuit, electronic switch, and the control end of electronic switch is connected with the output of voltage detecting circuit, electronic switch is connected in the triggering loop that will control thyristor, and the input of voltage detecting circuit is connected with thyristor.Voltage detecting circuit is just controlled the electronic switch conducting detecting under the condition that thyristor both end voltage value falls greater than the thyristor conducting voltage, the triggering signal that triggers transformer output triggers the thyristor conducting by electronic switch, voltage detecting circuit is when detecting described thyristor conducting, control described electronic switch immediately and close thyristor triggering control signal, reduce the energy consumption of triggering signal so greatly, the big current work time that has reduced control circuit and triggered transformer, the present invention triggers energy saver, and to have a circuit simple, cost is low, reliability is high and can conveniently be applied in range transformer and trigger in the thyristor switch of control thyristor conducting, make and trigger the triggering energy saver that energy consumption reduces greatly, can reduce the temperature rise of control circuit and the reliability of raising control circuit like this; Adopt the present invention to trigger the thyristor switch of energy saver, because it is lower that thyristor triggers the driving energy consumption, improved the pulse signal frequency that triggers transformer and pulse signal duty ratio (duty ratio can reach 1/2) or to the pulse signal of transformer carry out rectification, capacitance energy storage becomes direct current and gives the thyristor control end through triggering energy saver again, make thyristor switch of the present invention have to trigger that energy consumption is extremely low, the conducting good linearity, produce the advantage that harmonic content is little and reliability is high.
Description of drawings
The transformer of accompanying drawing 1 background technology triggers thyristor circuit figure.
Accompanying drawing 2 the present invention trigger one of energy saver embodiment circuit diagram.
Accompanying drawing 3 the present invention trigger two circuit diagrams of energy saver embodiment.
One of accompanying drawing 4 thyristor switch embodiment of the present invention circuit diagram.
Two circuit diagrams of accompanying drawing 5 thyristor switch embodiment of the present invention.
Embodiment
As shown in Figure 2, J1 is the triggering signal input, the triggering signal of input is connected with thyristor SCR1 through triggering energy saver (A), trigger energy saver (A), comprise electronic switch (A1), voltage detecting circuit (A2), electronic switch (A1) is connected on and will controls in the triggering loop of thyristor SCR1; Voltage detecting circuit (A2) input is connected to thyristor SCR1 two ends, voltage detecting circuit (A2) output is connected to the control end of electronic switch (A1) by a current-limiting resistance R2, and (annotate: R2 is inessential element, when electronic switch (A1) or the built-in current limiting element of voltage detecting circuit (A2) can, adopt the triode be built-in with current-limiting resistance as triode Q1, Q2).
Electronic switch (A1): built-in transistor Q1 (notes: the Q1 that accompanying drawing 2 indicates is a triode, as driving the effect meeting better with Darlington transistor or with the Darlington circuit that triode is formed).
Voltage detecting circuit (A2): by current-limiting resistance R1, diode D1, triode Q2 forms, current-limiting resistance R1, diode D1, the input of triode Q2 is composed in series the input circuit of signal, and (annotate: diode D1 is when employing forward drop during less than one volt diode, will be with two series connection, as with pressure drops such as light-emitting diodes during greater than one volt diode one get final product, also can voltage stabilizing didoe of differential concatenation, but after the thyristor SCR1 conducting of guaranteeing to be connected with input circuit, voltage detecting circuit (A2) energy reliable Detection), the collector electrode output control signal of triode Q2.
The course of work: J1 input has triggering signal, and (signal can be pulse signal, also can be dc signal), when thyristor SCR1 two ends forward voltage values can make the triode Q2 conducting of voltage detecting circuit (A2), triode Q2 conducting control electronic switch (A1) triode Q1 conducting, the triggering signal of J1 input triggers thyristor SCR1 conducting by electronic switch (A1), after thyristor SCR1 conducting, its both end voltage step-down, voltage detecting circuit (A2) triode Q2 ends, the triode Q1 of electronic switch (A1) ends, and finishes thyristor SCR1 triggering and conducting process.
Annotate: the triggering energy saver in Figure of description 2, its electronic switch transistor adopts P type pipe, the voltage detecting circuit triode adopts N type pipe, in actual applications, also can exchange with N type pipe and P type pipe, as long as wiring polarity changes a little, its operation principle is constant, just seldom gives unnecessary details at this.
As shown in Figure 3, this embodiment is the triggering energy saver of band zero cross fired, J1 is the triggering signal input, triggering energy saver (A) is connected with thyristor SCR1, trigger energy saver (A), comprise electronic switch (A1) and two-way voltage detecting circuit, the one tunnel is that voltage detecting circuit (A2), another road are voltage detecting circuit (A3), and voltage detecting circuit (A2) and voltage detecting circuit (A3) are formed a window voltage comparator; Electronic switch (A1) is connected on and will controls in the triggering loop of thyristor SCR1; Voltage detecting circuit (A2) input is connected to described thyristor SCR1 two ends, voltage detecting circuit (A2) output is connected to the control end (annotate: R2 is inessential element, when electronic switch (A1) or the built-in current limiting element of voltage detecting circuit (A2) can) of described electronic switch (A1) by current-limiting resistance R2; Voltage detecting circuit (A3) input is connected to described thyristor SCR1 two ends, and voltage detecting circuit (A3) output is connected to the control utmost point of the triode Q2 of voltage detecting circuit (A2), is used for controlling indirectly electronic switch (A1).
Electronic switch (A1): built-in transistor Q1 (notes: the Q1 that accompanying drawing 3 indicates is a triode, as driving the effect meeting better with Darlington transistor or with the Darlington circuit that triode is formed).
Voltage detecting circuit (A2): comprise current-limiting resistance R1, diode D1, triode Q2, the input of current-limiting resistance R1, diode D1, triode Q2 is composed in series the input circuit of signal, (annotate: diode D1 is when employing forward drop during less than one volt diode for the collector electrode of triode Q2 output control signal, will be with two series connection, as getting final product with one during greater than one volt diode) with pressure drops such as light-emitting diodes.
Voltage detecting circuit (A3): comprise current-limiting resistance R3, voltage stabilizing didoe D2, triode Q3, the input of current-limiting resistance R3, voltage stabilizing didoe D2, triode Q3 is composed in series the input circuit of signal, the collector electrode output control signal of triode Q3 (is annotated: voltage stabilizing didoe D2, can finish with many diode series connection identical with diode D1 performance, operation principle is identical).
The course of work: J1 input has triggering signal, and (signal can be pulse signal, also can be dc signal), when thyristor SCR1 two ends forward voltage values makes the triode Q3 conducting of voltage detecting circuit (A3) than high energy, triode Q3 control voltage detecting circuit (A2) triode Q2 ends, triode Q2 controls described electronic switch (A1) triode Q1 and ends, and prevents the non-zero cross fired of thyristor SCR1 voltage; Can just make the triode Q2 conducting of voltage detecting circuit (A2) and the triode Q3 of voltage detecting circuit (A3) can not conducting the time (in window voltage) in thyristor SCR1 two ends forward voltage values, described electronic switch (A1) triode Q1 conducting is controlled in triode Q2 conducting, the triggering signal of J1 input triggers described thyristor SCR1 conducting by described electronic switch (A1), its both end voltage step-down after thyristor SCR1 conducting, voltage detecting circuit (A2) triode Q2 ends, the triode Q1 of electronic switch (A1) ends, and finishes thyristor SCR1 voltage zero-cross triggering and conducting process.
Annotate: capacitor C 1 is the anti-false triggering electric capacity of thyristor control end, can prevent that from there is warfare in the output of voltage detecting circuit (A2) and voltage detecting circuit (A3), as do not have this electric capacity also can be at voltage detecting circuit (A2) control end little electric capacity in parallel as time-delay.
Thyristor switch as shown in Figure 4, a kind of the present invention of comprising triggers the thyristor switch of energy saver, triggering energy saver (A) is connected with the control end of thyristor SCR1, SCR2 (SCR1, SCR2 reverse parallel connection), trigger energy saver (A) input and be connected with triggering transformer T2 output, trigger transformer T2 input and be connected with the control circuit (B) that produces pulse signal by rectification circuit (finishing by diode D1, D2 respectively here).
Control circuit (B): it serves as the control core with microcontroller MCU (this embodiment MCU model is example with F300), the control circuit working power is imported power supply through transformer T1 pressure drop by the J1 port, after rectification circuit BR1 rectification, capacitor C 1 and C2 filtering, lead up to U1 voltage stabilizing, capacitor C 3 and C4 filtering to power to MCU; One the tunnel gives triggering transformer T2 power supply; Lead up to resistance R 8, the R7 dividing potential drop gives the P0.7 mouth of microcontroller MCU as voltage detection signal, J2 is the control input end mouth, the control signal of the control thyristor switch conducting of J2 input is through current-limiting resistance R18, photoelectrical coupler OPT1 and photoelectrical coupler OPT2, be input to the P0.2 mouth of microcontroller MCU by photoelectrical coupler OPT1, the control end of photoelectrical coupler OPT2 is connected to the P0.3 mouth of microcontroller MCU, the P0.1 mouth output pulse signal of microcontroller MCU drives triode Q5, drive triggering transformer T2 again by triode Q5, the P0.0 mouth of microcontroller MCU is connected with temperature sensor RT1, the P0.5 mouth of microcontroller MCU and the output of P0.6 mouth are by optoelectronic switch OPT3, the J5 port that OPT4 connects, the J6 port respectively as the control port that connects cooling fan be used to be connected the contactor control port that the thyristor switch bypass is used, the P0.4 mouth of microcontroller MCU is the voltage zero-crossing signal input port.
Voltage zero-crossing detection circuit: form (notes: the inessential element of diode D9 by instrument transformer T3, current-limiting resistance R19, photoelectrical coupler OPT5 and diode D9, during as the built-in damper diode of photoelectrical coupler OPT5 can), instrument transformer T3 input, photoelectrical coupler OPT5 input, current-limiting resistance R19 series connection, series loop is connected to described thyristor SCR1, SCR2 two ends, and the output of photoelectrical coupler OPT5 and instrument transformer T3 is connected to control circuit.
Annotate: photoelectrical coupler OPT2 is for to adopt in the one pole thyristor switch, when in the occasion of three-phase electricity control, three one pole thyristor switch input control ports can directly be connected and be controlled, when any one one pole thyristor switch breaks down, can turn-off by the microcontroller MCU control photoelectrical coupler OPT2 of failed thyristor switch, the The whole control input circuit is disconnected, reach other two purposes that the one pole thyristor switch can turn-off fast; Voltage zero-crossing detection circuit utilizes instrument transformer and the two detections of photoelectrical coupler can improve speed and the accuracy thereof that voltage zero-cross detects, and to the occasion that does not need voltage zero-cross to connect, can omit.
Trigger transformer T2 output by rectification circuit (diode D1, D2) be connected with triggering energy-saving circuit (A), T2 output has two windings, the output of one road winding is through rectification circuit (diode D1), electronic switch (Darlington transistor Q1) is connected to thyristor SCR1 control end, voltage detecting circuit is by diode D5, current-limiting resistance R1, diode D3, triode Q3 forms, diode D5, current-limiting resistance R1, diode D3, the series loop of triode Q3 input is connected with thyristor SCR1 two ends, and triode Q3 collector electrode is connected to the control end of Darlington transistor Q1 by current-limiting resistance R5; The output of one road winding is connected to the control end of thyristor SCR2 through rectification circuit (diode D2), electronic switch (Darlington transistor Q2), voltage detecting circuit is made up of diode D4, current-limiting resistance R1, diode D6, triode Q4, diode D4, current-limiting resistance R1, diode D6, the series loop of triode Q4 input are connected with thyristor SCR2 two ends, and triode Q4 collector electrode is connected to the control end of Darlington transistor Q2 by current-limiting resistance R6.
The course of work: after control circuit (B) powers on, microcontroller MCU gets electric work, microcontroller MCU detect each I/O mouth input signal just often the P0.3 port put low level, when the P0.2 of microcontroller MCU port detects input control signal and P0.4 port input voltage zero cross signal, the P0.1 port output pulse signal of microcontroller MCU (is got pulsewidth and is about 20 microseconds, duty ratio is got 1: 2 for good, be that the high-low level ratio is 1: 1) to triode Q5, drive by triode Q5 again and trigger transformer T2, triggering two windings of transformer T2 output passes through rectification circuit separately respectively and triggers energy saver (A) control thyristor SCR1, the SCR2 conducting, when thyristor SCR1 and SCR2 conducting or both end voltage are very low, the triode Q3 of voltage detecting circuit, Q4 is owing to there not being enough driving voltages to end, electronic switch (Darlington transistor Q1, Darlington transistor Q2) ends, when thyristor SCR1 and SCR2 both end voltage reach the voltage of about 2V (at this moment just can satisfy the triggering and conducting condition of thyristor), the triode Q3 conducting of voltage detecting circuit when being positive potential with respect to J4 as J3, the Darlington transistor Q1 conducting of electronic switch, thyristor SCR1 triggering and conducting, both end voltage is fallen less than 2V after the thyristor SCR1 conducting, the triode Q3 of voltage detecting circuit ends, Darlington transistor Q1 ends, triggering signal is closed, the triode Q4 conducting of voltage detecting circuit when being positive potential with respect to J3 as J4, the Darlington transistor Q2 conducting of electronic switch, thyristor SCR2 triggering and conducting, thyristor SCR2 one conducting both end voltage is fallen less than 2V, the triode Q4 of voltage detecting circuit ends, Darlington transistor Q2 ends, triggering signal is closed, when detecting, the P0.2 of microcontroller MCU port do not have the control signal of input, the P0.7 mouth of microcontroller MCU detects input power supply dead electricity, when the P0.0 mouth detected temperatures of microcontroller MCU is unusual, the P0.1 of microcontroller MCU closes pulse signal output, and be changed to low level, thyristor SCR1, the SCR2 current over-zero turn-offs; In the thyristor switch course of work, microcontroller MCU is according to the temperature signal of P0.0 input, the P0.6 mouth is controlled the optoelectronic switch OPT3 conducting of J5 mouth connection or is closed (being used to control the opening and closing of external fan), microcontroller MCU can be according to the frequency of J2 control input signals and the situation in the time interval, the P0.5 mouth of microcontroller MCU is controlled the optoelectronic switch OPT4 conducting of J6 mouth connection or is closed (being used to control the opening and closing of external contactor), and P0.3 mouth output high level turn-offs the J2 input circuit when detecting the thyristor switch operation irregularity as microcontroller MCU.
Thyristor switch as shown in Figure 5, a kind of the present invention of comprising triggers the thyristor switch of energy saver, triggering energy saver (A) is connected with the control end of thyristor SCR1, SCR2 (SCR1, SCR2 reverse parallel connection), trigger energy saver (A) input and be connected with triggering transformer T2 output, trigger transformer T2 input and be connected with the control circuit (B) that produces pulse signal by rectification circuit (finishing by diode D1, D2 respectively here).
Control circuit (B): it serves as the control core with microcontroller MCU (this embodiment MCU model is example with F300), the control circuit working power is imported power supply through transformer T1 pressure drop by the J1 port, after rectification circuit BR1 rectification, capacitor C 1 and C2 filtering, lead up to U1 voltage stabilizing, capacitor C 3 and C4 filtering to power to MCU; One the tunnel gives triggering transformer T2 power supply, lead up to resistance R 8, the R7 dividing potential drop gives the P0.7 mouth of microcontroller MCU as voltage detection signal, J2 is the control input end mouth, the control signal of the control thyristor switch conducting of J2 input is through current-limiting resistance R18, photoelectrical coupler OPT1 and photoelectrical coupler OPT2, be input to the P0.2 mouth of microcontroller MCU by photoelectrical coupler OPT1, the control end of photoelectrical coupler OPT2 is connected to the P0.3 mouth of microcontroller MCU, the P0.1 mouth output pulse signal of microcontroller MCU drives triode Q5, drive triggering transformer T2 again by triode Q5, the P0.0 mouth of microcontroller MCU is connected with temperature sensor RT1, the P0.5 mouth of microcontroller MCU and the output of P0.6 mouth are by optoelectronic switch OPT3, the J5 port that OPT4 connects, the J6 port is respectively as the control port that connects cooling fan be used to be connected the contactor control port that the thyristor switch bypass is used, and the P0.4 mouth of microcontroller MCU is and triggering energy saver (A) photoelectrical coupler OPT5, the control port that OPT6 is connected.
Trigger transformer T2 output by rectification circuit (diode D1, D2) be connected with triggering energy-saving circuit (A), the T2 output has two windings, the output of one road winding is through rectification circuit (diode D1), capacitor C 5 energy storage, electronic switch (Darlington transistor Q1) is connected to thyristor SCR1 control end, voltage detecting circuit comprises diode D5, current-limiting resistance R1, diode D3, triode Q3, diode D5, current-limiting resistance R1, diode D3, the series loop of triode Q3 input is connected with thyristor SCR1 two ends, and triode Q3 collector electrode is by photoelectrical coupler OPT5, current-limiting resistance R5 is connected to the control end of Darlington transistor Q1; The output of one road winding is connected to the control end of thyristor SCR2 through rectification circuit (diode D2), capacitor C 6 energy storage, electronic switch (Darlington transistor Q2), voltage detecting circuit is made up of diode D4, current-limiting resistance R1, diode D6, triode Q4, diode D4, current-limiting resistance R1, diode D6, the series loop of triode Q4 input are connected with thyristor SCR2 two ends, and triode Q4 collector electrode is connected to the control end of Darlington transistor Q2 by photoelectrical coupler OPT6, current-limiting resistance R6.
The course of work: after control circuit (B) powers on, microcontroller MCU gets electric work, microcontroller MCU detect the input of each I/O mouth just often the P0.3 port put low level, the P0.1 port output pulse signal of microcontroller MCU is given triode Q5, drive by triode Q5 again and trigger transformer T2, two windings of triggering transformer T2 output pass through rectifier diode D1 separately respectively, D2 gives capacitor C 5, the C6 energy storage of charging, when the P0.2 of microcontroller MCU port detects the input control signal, the P0.4 output low level of microcontroller MCU, photoelectrical coupler OPT5, OPT6 exports conducting, when thyristor SCR1 and SCR2 conducting or both end voltage are very low, the triode Q3 of voltage detecting circuit, Q4 is owing to there not being enough driving voltages to end, electronic switch (Darlington transistor Q1, Darlington transistor Q2) ends, when thyristor SCR1 and SCR2 both end voltage reach the voltage of about 2V (at this moment just can satisfy the triggering and conducting condition of thyristor), the triode Q3 conducting of voltage detecting circuit when being positive potential with respect to J4 as J3, the Darlington transistor Q1 conducting of electronic switch, thyristor SCR1 triggering and conducting, its both end voltage is fallen less than 2V after the thyristor SCR1 conducting, the triode Q3 of voltage detecting circuit ends, Darlington transistor Q1 ends, triggering signal is closed, the triode Q4 conducting of voltage detecting circuit when being positive potential with respect to J3 as J4, the Darlington transistor Q2 conducting of electronic switch, thyristor SCR2 triggering and conducting, thyristor SCR2 one conducting both end voltage is fallen less than 2V, the triode Q4 of voltage detecting circuit ends, Darlington transistor Q2 ends, triggering signal is closed, when detecting, the P0.2 of microcontroller MCU port do not have the control signal of input, the P0.7 mouth of microcontroller MCU detects input power supply dead electricity, when the P0.0 mouth detected temperatures of microcontroller MCU is unusual, the P0.4 output high level of microcontroller MCU, photoelectrical coupler OPT5, OPT6 output ends, electronic switch (Darlington transistor Q1, Darlington transistor Q2) ends thyristor SCR1, the SCR2 current over-zero turn-offs; In the thyristor switch course of work, microcontroller MCU is according to the temperature signal of P0.0 input, the P0.6 mouth is controlled the optoelectronic switch OPT3 conducting that is connected with the J5 mouth or is closed (being used to control the opening and closing of external fan), microcontroller MCU can be according to the frequency of J2 control input signals and the situation in the time interval, the P0.5 mouth of microcontroller MCU is controlled the optoelectronic switch OPT4 conducting that is connected with the J6 mouth or is closed (being used to control the opening and closing of external contactor), and P0.3 mouth output high level turn-offs the J2 input circuit when detecting the thyristor switch operation irregularity as microcontroller MCU.
In Figure of description, be more convenient understanding, thyristor all adopts unidirectional thyristor, also can use bidirectional thyristor instead, as long as electronic DC switch shown in the drawings is become electronic AC switch, direct voltage testing circuit shown in the drawings becomes ac voltage detection circuit and gets final product, and operation principle is identical; In the triggering transformer output loop of above-mentioned accompanying drawing 4 and accompanying drawing 5 embodiment thyristor switchs, accompanying drawing 4 is simple than accompanying drawing 5 circuit, accompanying drawing 5 embodiment have carried out capacitance energy storage (becoming dc signal) to the pulse signal that triggers transformer output, owing to there is not pulse signal duty ratio problem, its performance can be better; In control circuit, use microcontroller MCU to be the control core, help Based Intelligent Control to temperature and external control port, and can play the simplification circuit, the port of the control thyristor bypass contactor of J6, can connect for the client, in the long-term process of connecting of thyristor switch, with external Mechanical Contact device this thyristor switch is carried out bypass, this thyristor switch ON time and harmonic pollution have further been reduced, improve reliability of products, microcontroller MCU among thyristor switch embodiment one and the embodiment two is F300, and microcontroller MCU also can adopt other model to substitute, and operation principle is identical.
Claims (15)
1. one kind is triggered energy saver, it is characterized in that, comprising:
Voltage detecting circuit;
Electronic switch, the control end of described electronic switch is connected with the output of described voltage detecting circuit, and described electronic switch is connected in the triggering loop that will control thyristor, and the input of described voltage detecting circuit is connected with described thyristor.
2. triggering energy saver according to claim 1, the input signal that it is characterized in that described triggering energy saver is a pulse signal.
3. triggering energy saver according to claim 1, the input signal that it is characterized in that described triggering energy saver is a dc signal.
4. triggering energy saver according to claim 1 is characterized in that described electronic switch utilizes transistor as switch element, and described transistor is triode or Darlington transistor.
5. triggering energy saver according to claim 1, it is characterized in that described voltage detecting circuit comprises current-limiting resistance, diode, triode, the input series connection of described current-limiting resistance, described diode, described triode, the two ends of described series loop are connected with described thyristor two ends, and described triode output is connected with described electronic switch controling end.
6. triggering energy saver according to claim 1 is characterized in that described voltage detecting circuit has two-way, and the described voltage detecting circuit of two-way is formed a window voltage comparator.
7. thyristor switch that includes according to triggering energy saver any in the claim 1 to 6, it is characterized in that, it also comprises: control circuit, triggering transformer, rectification circuit, thyristor, described control circuit is connected with working power and control input end mouth, described control circuit is connected with described triggering transformer, described triggering transformer is connected with described triggering energy saver by rectification circuit, and described triggering energy saver is connected with described thyristor.
8. thyristor switch according to claim 7 is characterized in that described control circuit is built-in with microcontroller.
9. thyristor switch according to claim 8 is characterized in that described microcontroller is connected with controlled cut-off device, and described controlled cut-off device is connected in the mouth loop, described control input end.
10. thyristor switch according to claim 9 is characterized in that described controlled cut-off device is a photoelectrical coupler.
11. thyristor switch according to claim 7, it is characterized in that described thyristor two ends are connected with voltage zero-crossing detection circuit, described voltage zero-crossing detection circuit comprises photoelectrical coupler, instrument transformer and current-limiting resistance, described photoelectrical coupler input and described instrument transformer input are connected with described current-limiting resistance, described series loop is connected to described thyristor two ends, and the output of described photoelectrical coupler and the output of described instrument transformer are connected to described control circuit.
12. thyristor switch according to claim 7 is characterized in that described rectification circuit is connected with storage capacitor.
13. thyristor switch according to claim 7 is characterized in that described triggering energy saver is connected with photoelectrical coupler, described photoelectrical coupler control end is connected with described control circuit.
14. thyristor switch according to claim 7 is characterized in that described triggering transformer is non-Industrial Frequency Transformer.
15. thyristor switch according to claim 7 is characterized in that described control circuit is connected with temperature sensor, control fan output port and is used to control described thyristor switch bypass contactor output port.
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| CN2011101415075A CN102244510A (en) | 2011-05-18 | 2011-05-18 | Trigger energy saving apparatus and thyristor switch |
| CN201110430747.7A CN102522970B (en) | 2011-05-18 | 2011-12-08 | Trigger energy saver and thyristor switch |
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| CN2011101415075A CN102244510A (en) | 2011-05-18 | 2011-05-18 | Trigger energy saving apparatus and thyristor switch |
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| CN201110430747.7A Active CN102522970B (en) | 2011-05-18 | 2011-12-08 | Trigger energy saver and thyristor switch |
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| Publication number | Publication date |
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| CN102522970A (en) | 2012-06-27 |
| CN102522970B (en) | 2016-06-29 |
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