CN108880522B - Silicon controlled trigger circuit - Google Patents
Silicon controlled trigger circuit Download PDFInfo
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- CN108880522B CN108880522B CN201811050463.3A CN201811050463A CN108880522B CN 108880522 B CN108880522 B CN 108880522B CN 201811050463 A CN201811050463 A CN 201811050463A CN 108880522 B CN108880522 B CN 108880522B
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims abstract description 116
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 116
- 239000010703 silicon Substances 0.000 title claims abstract description 116
- 239000003990 capacitor Substances 0.000 claims description 36
- 230000002457 bidirectional effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 7
- 238000007599 discharging Methods 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/72—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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Abstract
The embodiment of the invention provides a silicon controlled trigger circuit, which relates to the technical field of electric control and comprises a time-sharing control circuit, a trigger and a silicon controlled power output loop. The time-sharing control circuit is used for respectively detecting voltages with different phase angles relative to two alternating current input ends in a positive half cycle and a negative half cycle of alternating current, and respectively provides different currents for the silicon controlled rectifier power output loop through the trigger, so that the silicon controlled rectifier power output loop outputs different currents for loads, and the triggering problem of the anti-parallel silicon controlled rectifier is solved. The circuit can independently control the power output of the positive half cycle and the negative half cycle, and can also accurately adjust the symmetry of the power output of the positive half cycle and the negative half cycle. The power output stability is good, the circuit is simple, the cost is low, and the method is also suitable for a low-power circuit control system.
Description
Technical Field
The invention belongs to the technical field of electric control, and particularly relates to a silicon controlled trigger circuit.
Background
The silicon controlled rectifier (SCR: silicon Controlled Rectifier) is a short name of a silicon controlled rectifier, is a high-power semiconductor device with a switching function and a rectifying function, and is commonly applied to various circuits such as controllable rectification frequency conversion, contactless switches and the like. The advantages of small volume, light weight, high power and long service life are achieved. The strong current output can be controlled by only providing a weak current trigger signal, so that the silicon controlled rectifier is a bridge for the semiconductor device to enter the strong current field from the weak current field. At present, the common thyristor triggering modes include the following:
and the trigger mode of changing the conduction angle through the trigger diode after the resistance-capacitance charge and discharge. The trigger circuit is simple, but has unstable output power, certain limitation on the power control range and poor reliability. For example, in the aspect of controlling LED dimming by a thyristor trigger circuit, a flicker problem exists.
The single crystal transistor changes the triggering mode of the conduction angle. The trigger circuit is complex, the full wave control needs to be input through a rectifier bridge, and the cost is high when the trigger circuit is used under high current.
Disclosure of Invention
In order to solve the problems of unstable output power, poor reliability, high cost and the like of a silicon controlled trigger circuit in the prior art, the embodiment of the invention provides the following technical scheme:
the thyristor trigger circuit has the characteristics of capability of independently adjusting the output power of positive and negative half cycles, good stability, simple circuit, low cost and the like.
The invention aims to provide a thyristor trigger circuit, which comprises a time-sharing control circuit and a thyristor power output loop. The time-sharing control circuit provides trigger currents with different phase angles for the silicon controlled rectifier power output loop in a positive half period and a negative half period of alternating current respectively, so that the silicon controlled rectifier power output loop outputs different currents for a load.
Further, the silicon controlled trigger circuit further comprises a trigger; the time-sharing control circuit provides trigger voltage values with different phase angles for the trigger respectively in a positive half cycle and a negative half cycle of alternating current, and the trigger triggers the silicon controlled power output loop according to the trigger voltage values.
Further, the silicon controlled power output loop comprises a first silicon controlled rectifier and a second silicon controlled rectifier; the time-sharing control circuit provides trigger currents with different phase angles for the first controllable silicon and the second controllable silicon respectively in a positive half period and a negative half period of alternating current.
Further, the time-sharing control circuit comprises a first capacitor, a second capacitor and a potentiometer; one end of the first capacitor is connected with a first alternating current input end, and the other end of the first capacitor is connected with one input end of the trigger through an output end and is connected with one end of the potentiometer; the other end of the potentiometer is connected with the other input end of the trigger through an output end and is connected with one end of the second capacitor; the other end of the second capacitor is connected with a second alternating current input end.
Further, the trigger comprises a first input end, a second input end, a first output end and a second output end; the first input end of the trigger is connected with the output end of the time-sharing control circuit; the second input end of the trigger is connected with the output end of the time-sharing control circuit; the first output end of the trigger is connected with the control stage of the first silicon controlled rectifier; and the second output end of the trigger is connected with the control stage of the second silicon controlled rectifier.
Further, in the positive half period of the alternating current, the trigger acquires trigger voltage from the output end of the time-sharing control circuit, and controls the first silicon controlled rectifier to be conducted; and the trigger acquires trigger voltage from the output end of the time-sharing control circuit in the negative half period of alternating current, and controls the second controllable silicon to be conducted.
Further, the cathode of the first silicon controlled rectifier in the silicon controlled rectifier power output loop is connected with the cathode of the second silicon controlled rectifier; the first silicon controlled anode is connected with a first alternating current input end through a load; the first silicon controlled rectifier control stage is connected with the first output end of the trigger; the anode of the second controllable silicon is connected with a second alternating current input end; and the control stage of the second controllable silicon is connected with the second output end of the trigger.
Further, the silicon controlled power output loop further comprises a third diode and a fourth diode; the positive electrode of the third diode is connected with the positive electrode of the fourth diode and is connected with the cathode of the first silicon controlled rectifier and the cathode of the second silicon controlled rectifier; the cathode of the third diode is connected with the anode of the first controllable silicon and is connected with a first alternating current input end through a load; the anode of the fourth diode is connected with the cathode of the first silicon controlled rectifier and the cathode of the second silicon controlled rectifier; the negative electrode of the fourth diode is connected with the anode of the second controllable silicon and is connected with the second alternating current input end.
Furthermore, the first silicon controlled rectifier and the second silicon controlled rectifier can be unidirectional silicon controlled rectifiers at the same time, and can be bidirectional silicon controlled rectifiers at the same time.
Further, the resistance value of the fixed resistor is 0.2 megaohms at minimum.
The embodiment of the invention provides a silicon controlled trigger circuit. The time-sharing control circuit is used for respectively detecting voltages with different phase angles relative to two alternating current input ends in a positive half cycle and a negative half cycle of alternating current, and respectively provides different currents for the silicon controlled rectifier power output loop through the trigger, so that the silicon controlled rectifier power output loop outputs different currents for loads, and the triggering problem of the anti-parallel silicon controlled rectifier is solved. And the circuit can independently control the power output of the positive half cycle and the negative half cycle, and the power output stability is good. The two thyristors are respectively used for conducting output current in the positive half cycle and the negative half cycle of the alternating current, so that the damage of the thyristors caused by overlarge current change rate during motor speed regulation can be effectively avoided, the symmetry of the power output in the positive half cycle and the negative half cycle can be accurately regulated, and the circuit is simple and the cost is low.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a thyristor trigger circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a time-sharing control circuit in a thyristor trigger circuit according to an embodiment of the invention;
FIG. 3 is an alternative circuit diagram of a time-sharing control circuit in a thyristor trigger circuit disclosed in an embodiment of the invention;
fig. 4 is a circuit diagram of a thyristor trigger circuit according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, based on the examples herein, which are within the scope of the invention as defined by the claims, will be within the scope of the invention as defined by the claims.
The invention discloses a silicon controlled trigger circuit, which comprises a time-sharing control circuit and a silicon controlled power output loop; the time-sharing control circuit provides trigger currents with different phase angles for the silicon controlled rectifier power output loop in the positive half period and the negative half period of alternating current respectively, so that the silicon controlled rectifier power output loop outputs different currents for a load.
The silicon controlled trigger circuit provided by the embodiment effectively avoids the damage of the silicon controlled rectifier caused by overlarge current change rate when the motor is used for speed regulation, and can accurately adjust the symmetry of the positive half-cycle power output and the negative half-cycle power output.
Based on the thyristor trigger circuit, an embodiment of the present invention provides an improved implementation manner, referring to fig. 1, and the thyristor trigger circuit of the embodiment further includes a trigger; the time-sharing control circuit provides trigger voltage values with different phase angles for the trigger respectively in a positive half cycle and a negative half cycle of the alternating current, and the trigger triggers the silicon controlled rectifier power output loop according to the trigger voltage values so that the silicon controlled rectifier power output loop outputs different currents for the load.
Specifically, the alternating current input end is connected with the time-sharing control circuit, and provides alternating current signals for the time-sharing control circuit; the time-sharing control circuit is connected with the silicon controlled rectifier power output loop through the trigger, and outputs pulse current to trigger and conduct the silicon controlled rectifier; the silicon controlled rectifier power output loop is connected with the load to realize that current flows through the load, so that the power output is controlled and regulated, and the system stability is good.
As an alternative implementation of this embodiment, referring to fig. 4, the trigger may include: the first input end, the second input end, the first output end and the second output end; the first input end of the trigger is connected with the first capacitor, the anode of the first diode and the cathode of the second diode; the second input end of the trigger is connected with one end of the second capacitor and is connected with one end of a parallel circuit consisting of the fixed resistor and the switch; the first output end of the trigger is connected with the control stage of the first silicon controlled rectifier; the second output end of the trigger is connected with the control stage of the second silicon controlled rectifier. In the positive half cycle and the negative half cycle of the alternating current, the time-sharing control circuit respectively provides trigger voltage values with different phase angles for the trigger, pulse currents with different phase angles output by the trigger are respectively conducted with the two thyristors, and then the power stable output of the positive half cycle and the negative half cycle can be well controlled and regulated.
As an alternative implementation manner of this embodiment, referring to fig. 4, the thyristor power output circuit includes a first thyristor and a second thyristor;
the time-sharing control circuit provides trigger currents with different phase angles for the first silicon controlled rectifier and the second silicon controlled rectifier respectively in a positive half period and a negative half period of alternating current. Specifically, in the positive half-cycle of the alternating current, the time-sharing control circuit provides trigger voltages with different phase angles for the trigger, and pulse currents with different phase angles are output through the trigger to trigger the first silicon controlled rectifier to be conducted so that the current flows through the load to form a loop, and the power output of the positive half-cycle is realized; in the negative half cycle of alternating current, the time-sharing control circuit provides trigger voltages with different phase angles for the trigger, and pulse currents with different phase angles are output through the trigger to trigger the second silicon controlled rectifier to conduct, so that the current flows through the load to form a loop, and negative half cycle power output is achieved. The two thyristors are respectively conducted in the positive half period and the negative half period, so that independent output power of the positive half period and the negative half period is realized, and the problem that the thyristors are damaged due to overlarge current change rate of the motor in speed regulation is effectively solved.
Specifically, the cathode of the first silicon controlled rectifier is connected with the cathode of the second silicon controlled rectifier; the first silicon controlled anode is connected with a first alternating current input end through a load; the first thyristor control stage is connected with a first output end of the trigger; the anode of the second controllable silicon is connected with a second alternating current input end; the control stage of the second thyristor is connected with the second output end of the trigger.
As an alternative to this embodiment, referring to fig. 4, the thyristor power output loop further includes a third diode and a fourth diode; the positive electrode of the third diode is connected with the positive electrode of the fourth diode and is connected with the cathode of the first silicon controlled rectifier and the cathode of the second silicon controlled rectifier; the cathode of the third diode is connected with the anode of the first controllable silicon and is connected with the first alternating current input end through a load; the anode of the fourth diode is connected with the cathode of the first silicon controlled rectifier and the cathode of the second silicon controlled rectifier; the negative electrode of the fourth diode is connected with the anode of the second controllable silicon and is connected with the second alternating current input end.
Fig. 2 is a schematic diagram of a time-sharing control circuit disclosed in this embodiment, which includes a first capacitor C1, a second capacitor C2, and a potentiometer RW. One end of the first capacitor C1 is connected with the first alternating current input end AC1, and the other end of the first capacitor C is connected with the first input end of the trigger through the output end A and is simultaneously connected with one end of the potentiometer RW; the other end of the potentiometer is connected with a second input end of the trigger through an output end B and is connected with one end of the second capacitor C2; the other end of the second capacitor C2 is connected to the second AC input AC 2.
Specifically, in the positive half cycle of the alternating current, the time-sharing control circuit provides trigger voltage values with different phase angles for the trigger through an output A end, and the trigger outputs trigger current to trigger the first silicon controlled rectifier to be conducted according to the trigger voltage values; in the negative half cycle of alternating current, the time-sharing control circuit provides trigger voltage values with different phase angles for the trigger through the output end B, and the trigger outputs trigger current according to the trigger voltage values to trigger the second silicon controlled rectifier to conduct, so that the trigger problem of the anti-parallel silicon controlled rectifier is solved.
Specifically, as an alternative manner of this embodiment, the circuit diagram of the time-sharing control circuit disclosed in this embodiment may include, as shown in fig. 3, a first capacitor C1, a second capacitor C2, a first diode D1, a second diode D2, a first adjustable resistor R1, a second adjustable resistor R2, a potentiometer RW, a fixed resistor R, and a switch K. One end of the first capacitor C1 is connected with the first alternating current input end AC1 through a load, and the other end of the first capacitor C is connected with one end of the potentiometer RW through a parallel circuit consisting of a first diode D1, a first adjustable resistor R1, a second diode D2 and a second adjustable resistor R2; the negative electrode of the first diode D1 is connected with one end of the potentiometer RW through a first resistor R1; the positive electrode of the second diode D2 is connected with one end of the potentiometer RW through a second resistor R2; the other end of the potentiometer RW is connected with one end of the second capacitor C2; the other end of the second capacitor C2 is connected to the second AC input AC 2.
In the positive half-cycle of the alternating current, the current flows from the first alternating current input end AC1 through the first capacitor C1, through the series circuit of the first diode D1 and the first adjustable resistor R1, flows through the potentiometer RW, and then returns to the second alternating current input end AC2 through the second capacitor C2 to form a charging and discharging loop. In the negative half cycle of the alternating current, the current flows from the second alternating current input end AC2 through the second capacitor C2, through the series circuit of the second adjustable resistor R2 and the second diode D2 through the potentiometer RW, and then returns to the first alternating current input end AC1 through the first capacitor C1 to form a charging and discharging loop. In the time-sharing control circuit disclosed in the embodiment, two different charge-discharge loops are respectively formed in the positive half-period and the negative half-period of alternating current, and the positive half-period and the negative half-period are adjusted to be completely symmetrical by respectively adjusting the resistance value of the adjustable resistor of the charge-discharge loop, so that unbalanced output power of the positive half-period and the negative half-period due to the parameter difference of components is effectively avoided.
Fig. 4 is a specific circuit diagram of an implementation of the scr trigger circuit disclosed in this embodiment. The time-sharing control circuit also comprises a fixed resistor and a switch; the fixed resistor and the switch form a parallel circuit; one end of the parallel circuit is connected with the potentiometer, and the other end of the parallel circuit is connected with the second alternating current input end through the second capacitor.
In this embodiment, when switch K is closed:
in the positive half-cycle of alternating current, because the level of the end of the first alternating current input end AC1 is higher than that of the end of the second alternating current input end AC2, current returns to the second alternating current input end AC2 from the first alternating current input end AC1 through the first capacitor C1, the first diode D1, the first adjustable resistor R1, the potentiometer RW and the second capacitor C2 to form a positive half-cycle charging and discharging loop. Along with the gradual rise of the potential difference between the second input end B of the trigger and the second alternating current input end AC2, when the potential difference reaches the voltage value set by the trigger, the first output end D of the trigger outputs pulse current to conduct the first silicon controlled rectifier K1 through the control stage G1. At this time, the current flows from the first AC input terminal AC1 through the load, the first thyristor K1, and the fourth diode D4 back to the second AC input terminal AC2 to form a path, so that the current of the positive half-cycle flows through the load output power. When the alternating current signal is switched from the positive half cycle to the negative half cycle, the first thyristor K1 is disconnected.
In the negative alternating current half period, because the level of the end of the second alternating current input end AC2 is higher than that of the end of the first alternating current input end AC1, current returns to the first alternating current input end AC1 from the second alternating current input end AC2 through the second capacitor C2, the potentiometer RW, the second adjustable resistor R2, the second diode D2 and the first capacitor C1 to form a negative half period charging and discharging loop. Along with the gradual rise of the potential difference between the first input end A of the trigger and the first alternating current input end AC1, when the potential difference reaches the voltage value set by the trigger, the second output end C of the trigger outputs pulse current to conduct the second silicon controlled rectifier K2 through the control stage G2. At this time, the current returns to the first AC input terminal AC1 from the second AC input AC2 through the second thyristor K2, the third diode D3, and the load to form a path, so as to realize that the current of the negative half-cycle flows through the load output power. At the moment when the alternating current signal is switched from the negative half cycle to the positive half cycle, the second thyristor K2 is turned off.
Specifically, in the positive half-period of the alternating current, the arrival time of the pulse signal of the charge-discharge loop of the positive half-period is controlled by adjusting the resistance value of the first adjustable resistor R1, so that the range of the conduction angle of the first silicon controlled rectifier K1 is adjusted, and finally, the independent adjustment of the output power of the positive half-period is realized; in the negative half period of the alternating current, the arrival time of the pulse signal of the charge-discharge loop of the negative half period is controlled by adjusting the resistance value of the second adjustable resistor R2, so that the range of the conduction angle of the second silicon controlled rectifier K2 is adjusted, and finally, the independent adjustment of the output power of the negative half period is realized.
When K is disconnected, the charge-discharge loop needs to pass through the fixed resistor R in the positive half period and the negative half period of the alternating current, and the resistance value of the fixed resistor R is very large (more than or equal to 0.2 megaohm), so that the potential difference between the input end of the trigger and the alternating current input end cannot reach the voltage value set by the trigger, and therefore, the first silicon controlled rectifier K1 and the second silicon controlled rectifier K2 cannot be triggered and conducted, and the load is in a closed state and has no power output.
In this embodiment, the thyristor power output loop includes two thyristors, and is particularly suitable for micro-power circuit control.
In the above embodiment, the first silicon controlled rectifier and the second silicon controlled rectifier may be unidirectional silicon controlled rectifiers at the same time, or may be bidirectional silicon controlled rectifiers at the same time, and the specific selection of which silicon controlled rectifiers is selected by those skilled in the art according to engineering requirements.
According to the thyristor trigger circuit provided by the embodiment, the time-sharing control circuit outputs a pulse signal through the trigger to control the thyristor to be conducted so as to realize that current flows through a load. Because the charge and discharge loops of the positive half period and the negative half period are completely different, the output power of the positive half period and the negative half period can be completely symmetrical by respectively adjusting the resistance values of the first adjustable resistor R1 and the second adjustable resistor R2, so that unstable power output caused by component parameter difference is avoided, and the problem of flicker can be well solved in a silicon controlled LED dimming circuit; the two thyristors are respectively conducted in the positive half period and the negative half period, so that independent output power of the positive half period and the negative half period is realized, the problem that the thyristors are damaged due to overlarge current change rate when the motor is used for speed regulation is effectively solved, meanwhile, the problem that a low-power load is unstable is solved, the cost is low, and the effect is good, and mass production is convenient.
The starting time of the positive half period and the negative half period can be started according to the required phase difference by adjusting the resistance values of the first adjustable resistor R1 and the second adjustable resistor R2 according to the requirement, so that the asymmetric output power of the positive half period and the negative half period is realized, and the special requirement is met.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. The thyristor trigger circuit is characterized by comprising a time-sharing control circuit and a thyristor power output loop; the time-sharing control circuit provides trigger currents with different phase angles for the silicon controlled rectifier power output loop in a positive half period and a negative half period of alternating current respectively, so that the silicon controlled rectifier power output loop outputs different currents for a load;
the time-sharing control circuit includes: the first capacitor, the second capacitor and the potentiometer;
one end of the first capacitor is connected with a first alternating current input end, and the other end of the first capacitor is connected with one input end of the trigger through an output end and is connected with one end of the potentiometer; the other end of the potentiometer is connected with the other input end of the trigger through an output end and is connected with one end of the second capacitor; the other end of the second capacitor is connected with a second alternating current input end;
the time-sharing control circuit also comprises a fixed resistor and a switch; the fixed resistor and the switch form a parallel circuit; one end of the parallel circuit is connected with the potentiometer, and the other end of the parallel circuit is connected with the second alternating current input end through the second capacitor;
the silicon controlled rectifier power output loop comprises a first silicon controlled rectifier and a second silicon controlled rectifier;
the time-sharing control circuit provides trigger currents with different phase angles for the silicon controlled rectifier power output loop respectively in a positive half cycle and a negative half cycle of alternating current, wherein the trigger currents are as follows: the time-sharing control circuit provides trigger currents with different phase angles for the first silicon controlled rectifier and the second silicon controlled rectifier respectively in a positive half period and a negative half period of alternating current;
the cathode of the first silicon controlled rectifier is connected with the cathode of the second silicon controlled rectifier; the first silicon controlled anode is connected with a first alternating current input end through a load; the first silicon controlled rectifier control stage is connected with the first output end of the trigger; the anode of the second controllable silicon is connected with a second alternating current input end; the control stage of the second controllable silicon is connected with the second output end of the trigger;
the silicon controlled rectifier power output loop also comprises a third diode and a fourth diode;
the positive electrode of the third diode is connected with the positive electrode of the fourth diode and is connected with the cathode of the first silicon controlled rectifier and the cathode of the second silicon controlled rectifier; the cathode of the third diode is connected with the anode of the first controllable silicon and is connected with a first alternating current input end through a load; the anode of the fourth diode is connected with the cathode of the first silicon controlled rectifier and the cathode of the second silicon controlled rectifier; the negative electrode of the fourth diode is connected with the anode of the second controllable silicon and is connected with the second alternating current input end.
2. The thyristor trigger circuit according to claim 1, further comprising a trigger;
the time-sharing control circuit provides trigger currents with different phase angles for the silicon controlled rectifier power output loop respectively in a positive half cycle and a negative half cycle of alternating current, wherein the trigger currents are as follows: the time-sharing control circuit provides trigger voltage values with different phase angles for the trigger respectively in a positive half cycle and a negative half cycle of alternating current, and the trigger triggers the silicon controlled power output loop according to the trigger voltage values.
3. The thyristor trigger circuit according to claim 2, wherein said trigger comprises: the first input end, the second input end, the first output end and the second output end;
the first input end of the trigger is connected with the output end of the time-sharing control circuit; the second input end of the trigger is connected with the output end of the time-sharing control circuit; the first output end of the trigger is connected with the control stage of the first silicon controlled rectifier; and the second output end of the trigger is connected with the control stage of the second silicon controlled rectifier.
4. The thyristor trigger circuit according to claim 2, wherein said trigger acquires trigger voltage from said time-sharing control circuit output terminal during a positive half cycle of the alternating current to control the conduction of the first thyristor; and the trigger acquires trigger voltage from the output end of the time-sharing control circuit in the negative half period of alternating current, and controls the second controllable silicon to be conducted.
5. The thyristor trigger circuit according to claim 2, wherein the first and second thyristors are simultaneously unidirectional thyristors or are simultaneously bidirectional thyristors.
6. The thyristor trigger circuit according to claim 2, wherein said fixed resistance is at least 0.2 megaohms.
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| CN108880522A (en) | 2018-11-23 |
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