CN219475718U - Zero-crossing detection circuit and silicon controlled rectifier voltage stabilizing equipment - Google Patents
Zero-crossing detection circuit and silicon controlled rectifier voltage stabilizing equipment Download PDFInfo
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- CN219475718U CN219475718U CN202320415073.1U CN202320415073U CN219475718U CN 219475718 U CN219475718 U CN 219475718U CN 202320415073 U CN202320415073 U CN 202320415073U CN 219475718 U CN219475718 U CN 219475718U
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Abstract
The utility model discloses a zero-crossing detection circuit and a silicon controlled rectifier voltage stabilizing device, which are applied to the technical field of power electronics and are used for solving the problem of poor zero-crossing detection reliability in the prior art, and specifically comprise the following steps: the device comprises at least one silicon controlled rectifier, at least one voltage detection module, at least one rectification module, at least one isolation module and a zero crossing output module; the voltage detection module is used for detecting the voltage at two ends of the connected silicon controlled rectifier and reducing the voltage; the rectification module is used for converting the voltage into direct-current voltage; the isolation module is used for connecting the third end and the fourth end of the isolation module when the input direct-current voltage reaches a preset voltage; and the zero-crossing output module is used for outputting a level signal corresponding to a voltage zero-crossing point when the connection between the third end and the fourth end of all the isolation modules is switched on. Thus, the voltage detection module is used for detecting the voltages at two ends of the silicon controlled rectifier, and all the silicon controlled rectifiers output level signals corresponding to zero crossing points after being disconnected, so that the reliability of zero crossing point detection is improved.
Description
Technical Field
The utility model relates to the technical field of power electronics, in particular to a zero-crossing detection circuit and a silicon controlled rectifier voltage stabilizing device.
Background
The silicon controlled rectifier voltage stabilizer is used as a novel voltage stabilizer, and has the advantages of high voltage stabilizing precision, high switching speed, no noise, no spark during voltage switching when encountering high power, no arcing phenomenon, long service life and the like, thereby gradually replacing the relay type voltage stabilizer. When the voltage taps of the silicon controlled rectifier are switched, the voltage taps must be switched at the zero crossing point of the voltage, so that the minimum impact can be ensured, and the service life of components is prolonged.
Currently, in order to realize that when different voltage taps are switched, the voltage zero-crossing point can be always switched, the commonly adopted modes are divided into the following two modes. The first mode is to trigger the conduction of the silicon controlled rectifier by using an optocoupler with a zero-crossing triggering function, such as (MOC 3081, MOC3061 and the like), and the mode is simple and easy to realize, but the zero-crossing detection of the scheme is unstable and has poor reliability, and false triggering is easy to generate in the occasion of voltage transient, and even the silicon controlled rectifier is broken down and burned. The second mode is to use software and a voltage zero detection circuit to generate pulses at the zero point of the mains voltage and send the pulses to the controller, then the controller switches the voltage tap at the zero point rapidly when the tap is needed to be changed to finish the conversion of the output voltage.
Disclosure of Invention
The embodiment of the utility model provides a zero-crossing detection circuit and a silicon controlled rectifier voltage stabilizing device, which are used for solving the problem of poor zero-crossing detection reliability in the prior art.
The technical scheme provided by the embodiment of the utility model is as follows:
in one aspect, an embodiment of the present utility model provides a zero-crossing detection circuit, including: the device comprises at least one silicon controlled rectifier, at least one voltage detection module, at least one rectification module, at least one isolation module and a zero crossing output module;
the first electrode of at least one silicon controlled rectifier is connected with an external first power supply; the first end of each voltage detection module in the at least one voltage detection module is connected with the first pole of the corresponding silicon controlled rectifier in the at least one silicon controlled rectifier, the second end of each voltage detection module in the at least one voltage detection module is connected with the second pole of the corresponding silicon controlled rectifier in the at least one silicon controlled rectifier, the third end of each voltage detection module in the at least one voltage detection module is connected with the first end of the corresponding rectification module in the at least one rectification module, and the fourth end of each voltage detection module in the at least one voltage detection module is connected with the second end of the corresponding rectification module in the at least one rectification module; the voltage detection module is used for detecting the voltage at two ends of the connected silicon controlled rectifier and reducing the voltage;
the third end of each rectifying module in the at least one rectifying module is connected with the first end of the corresponding isolating module in the at least one isolating module, and the fourth end of each rectifying module in the at least one rectifying module is connected with the second end of the corresponding isolating module in the at least one isolating module; the rectification module is used for converting the voltage reduced by the voltage detection module into direct-current voltage;
the third end of a first isolation module in the at least one isolation module is connected with the first end of the zero-crossing output module, the third end of the isolation module except the first isolation module in the at least one isolation module is connected with the fourth end of the previous isolation module, and the fourth end of the last isolation module in the at least one isolation module is grounded; the isolation module is used for connecting the third end and the fourth end of the isolation module when the input direct-current voltage reaches a preset voltage;
the second end of the zero-crossing output module is connected with an external second power supply, and the third end of the zero-crossing output module is connected with an external controller; and the zero-crossing output module is used for outputting a level signal corresponding to a voltage zero-crossing point when the connection between the third end and the fourth end of all the isolation modules is switched on.
In one possible embodiment, each of the at least one voltage detection module comprises: a first resistor, a second resistor, a third resistor and a fourth resistor;
the first end of the first resistor is connected with the first pole of the corresponding silicon controlled rectifier in the at least one silicon controlled rectifier, and the second end of the first resistor is connected with the first end of the second resistor; the second end of the second resistor is connected with the first end of the corresponding rectifying module in the at least one rectifying module;
the first end of the third resistor is connected with the second pole of the corresponding silicon controlled rectifier in the at least one silicon controlled rectifier, and the second end of the third resistor is connected with the first end of the fourth resistor; the second end of the fourth resistor is connected with the second end of the corresponding rectifying module in the at least one rectifying module.
In one possible embodiment, each of the at least one rectifying module comprises: a rectifier bridge;
the first input end of the rectifier bridge is connected with the third end of the corresponding voltage detection module in the at least one voltage detection module, the second input end of the rectifier bridge is connected with the fourth end of the corresponding voltage detection module in the at least one voltage detection module, the first output end of the rectifier bridge is connected with the first end of the corresponding isolation module in the at least one isolation module, and the second output end of the rectifier bridge is connected with the second end of the corresponding isolation module in the at least one isolation module.
In one possible embodiment, each of the at least one isolation module comprises: an optical coupler isolation device formed by a first light emitting diode and a first triode;
the anode of the first light-emitting diode is connected with the third end of the corresponding rectifying module in the at least one rectifying module, and the cathode of the first light-emitting diode is connected with the fourth end of the corresponding rectifying module in the at least one rectifying module;
the collector of the first triode is used as the third end of the isolation module, and the emitter of the first triode is used as the fourth end of the isolation module.
In one possible implementation, the zero crossing output module includes: the fifth resistor, the sixth resistor, the seventh resistor and the second triode;
the first end of the fifth resistor is connected with an external second power supply, and the second end of the fifth resistor is respectively connected with the third end of the first isolation module and the first end of the sixth resistor in the at least one isolation module;
the second end of the sixth resistor is connected with the base electrode of the second triode;
the emitter of the second triode is connected with an external second power supply, the collector of the second triode is grounded through a seventh resistor, and a third end of the zero-crossing output module is arranged on the connection wire of the collector of the second triode and the seventh resistor.
In one possible implementation, the zero-crossing detection circuit further includes: at least one absorption circuit;
the first end of each absorption circuit in the at least one absorption circuit is connected with the first pole of the corresponding silicon controlled rectifier in the at least one silicon controlled rectifier, and the second end of each absorption circuit in the at least one absorption circuit is connected with the second pole of the corresponding silicon controlled rectifier in the at least one silicon controlled rectifier; the absorption circuit is used for inhibiting voltage surge of the silicon controlled rectifier and preventing the silicon controlled rectifier from being triggered by mistake.
In one possible embodiment, each of the at least one snubber circuits includes: eighth resistor and capacitor;
the first end of the eighth resistor is connected with the first pole of the corresponding silicon controlled rectifier in the at least one silicon controlled rectifier, the second end of the eighth resistor is connected with the first end of the capacitor, and the second end of the capacitor is connected with the second pole of the corresponding silicon controlled rectifier in the at least one silicon controlled rectifier.
In another aspect, an embodiment of the present utility model provides a scr voltage stabilizing apparatus, including: at least one embodiment of the utility model provides the zero-crossing detection circuit, at least one driving module, a winding module and a control module; a first end of each zero-crossing detection circuit in the at least one zero-crossing detection circuit is connected with a first end of a corresponding driving module in the at least one driving module, a second end of each zero-crossing detection circuit in the at least one zero-crossing detection circuit is connected with a first end of the winding module, and a third end of each zero-crossing detection circuit in the at least one zero-crossing detection circuit is connected with a first end of the control module; the second end of each driving module in the at least one driving module is connected with the second end of the control module, and the third end of each driving module in the at least one driving module is connected with an external third power supply; the second end of the winding module is connected to an external ac voltage.
In one possible embodiment, each of the at least one drive module comprises: a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, an optocoupler isolation device, a second light emitting diode and a third triode;
the first end of the optical coupling isolation device is connected with an external third power supply, the second end of the optical coupling isolation device is connected with the control module, the third end of the optical coupling isolation device is connected with the external first power supply, and the fourth end of the optical coupling isolation device is connected with the base electrode of the third triode through a ninth resistor;
the emitter of the third triode is connected with the ground, and the third triode is connected with an external first power supply through a second light emitting diode and a tenth resistor in sequence;
the first end of the eleventh resistor is connected with the base electrode of the third triode, and the second end of the eleventh resistor is connected with the emitter electrode of the third triode;
the first end of the twelfth resistor is connected with the collector electrode of the third triode, and the second end of the twelfth resistor is connected with the control electrode of the corresponding silicon controlled rectifier of the corresponding zero-crossing detection circuit in the at least one zero-crossing detection circuit;
the first end of the thirteenth resistor is connected with the external first power supply, and the second end of the thirteenth resistor is connected with the second end of the twelfth resistor.
In one possible embodiment, the winding module comprises: a primary winding module and a secondary winding module;
the primary winding module and the secondary winding module are respectively connected with different zero-crossing detection circuits; the primary winding module is connected with external alternating voltage.
The embodiment of the utility model has the following beneficial effects:
in the embodiment of the utility model, the voltage detection module is used for detecting the voltage at two ends of the silicon controlled rectifier, so that the influence caused by different load types when the input voltage is detected can be avoided, the reliability of zero crossing detection is improved, and the third ends and the fourth ends of all the isolation modules are sequentially connected in series on the connecting line between the first end of the zero crossing output module and the ground, and only when all the silicon controlled rectifiers in the circuit are disconnected, the first end of the zero crossing output module is grounded, and the zero crossing output module outputs a high level, so that the zero crossing output module outputs a level signal corresponding to the voltage zero crossing after all the silicon controlled rectifiers are disconnected on a physical level, and the reliability of zero crossing detection is further improved.
Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model and do not constitute a limitation on the utility model. In the drawings:
FIG. 1 is a schematic diagram of a zero crossing detection circuit including a thyristor according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of a first configuration of a zero crossing detection circuit including three thyristors according to an embodiment of the present utility model;
FIG. 3 is a schematic diagram of a second structure of a zero crossing detection circuit including three thyristors according to an embodiment of the present utility model;
FIG. 4 is a schematic diagram of a third configuration of a zero crossing detection circuit including three thyristors according to an embodiment of the present utility model;
FIG. 5 is a schematic diagram of a fourth configuration of a zero crossing detection circuit including three thyristors according to an embodiment of the present utility model;
FIG. 6 is a schematic diagram of a fifth configuration of a zero crossing detection circuit including three thyristors according to an embodiment of the present utility model;
FIG. 7 is a schematic diagram of a sixth configuration of a zero crossing detection circuit including three thyristors according to an embodiment of the present utility model;
fig. 8 is a schematic diagram of a seventh configuration of a zero crossing detection circuit including three thyristors according to an embodiment of the present utility model;
FIG. 9 is a schematic diagram of a first structure of a SCR voltage stabilizing apparatus according to an embodiment of the present utility model;
fig. 10 is a schematic structural diagram of a driving module in a scr voltage stabilizing apparatus according to an embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The embodiment of the present utility model provides a zero-crossing detection circuit, the zero-crossing detection circuit 100 includes: at least one thyristor, at least one voltage detection module 110, at least one rectification module 120, at least one isolation module 130, and a zero crossing output module 140;
the first electrode of at least one silicon controlled rectifier is connected with an external first power supply; a first end of each of the at least one voltage detection module 110 is connected to a first pole of a corresponding one of the at least one silicon controlled rectifier, a second end of each of the at least one voltage detection module 110 is connected to a second pole of a corresponding one of the at least one silicon controlled rectifier, a third end of each of the at least one voltage detection module 110 is connected to a first end of a corresponding one of the at least one rectifier module 120, and a fourth end of each of the at least one voltage detection module 110 is connected to a second end of a corresponding one of the at least one rectifier module 120; the voltage detection module 110 is used for detecting the voltage at two ends of the connected silicon controlled rectifier and reducing the voltage;
the third end of each of the at least one rectifying module 120 is connected to a corresponding first end of the at least one isolation module 130 of the at least one isolating module 130, and the fourth end of each of the at least one rectifying module 120 is connected to a corresponding second end of the at least one isolation module 130 of the at least one rectifying module 120; the rectifying module 120 is configured to convert the voltage reduced by the voltage detecting module 110 into a dc voltage;
a third end of a first isolation module 130 of the at least one isolation module 130 is connected to a first end of the zero-crossing output module 140, a third end of an isolation module 130 other than the first isolation module 130 of the at least one isolation module 130 is connected to a fourth end of a previous isolation module 130, and a fourth end of a last isolation module 130 of the at least one isolation module 130 is grounded; the isolation module 130 is configured to connect the third terminal and the fourth terminal of the isolation module 130 when the input dc voltage reaches a preset voltage;
a second end of the zero-crossing output module 140 is connected with an external second power supply, and a third end of the zero-crossing output module 140 is connected with an external controller; the zero-crossing output module 140 is configured to output a level signal corresponding to a zero-crossing point of the voltage when all the connections between the third terminal and the fourth terminal of the isolation module 130 are turned on.
In practical application, in the zero-crossing detection circuit 100, the number of thyristors, the voltage detection module 110, the rectification module 120 and the isolation module 130 is the same, each thyristor is correspondingly provided with one voltage detection module 110, one rectification module 120 and one isolation module 130, and the third ends and the fourth ends of all the isolation modules 130 are sequentially connected in series on the connection line between the first end of the zero-crossing output module 140 and the ground. The silicon controlled rectifier is generally a bidirectional silicon controlled rectifier, the number of the silicon controlled rectifiers can be set according to actual needs, and the voltage provided by the external first power supply and the external second power supply is +5V. The voltage detection module 110 may detect voltages at two ends of the corresponding connected thyristors, and step down the voltages at two ends of the thyristors, where the stepped down voltages are ac, and the stepped down voltages are rectified by the rectification module 120 and then converted into dc, and then input to the isolation module 130. The voltage reduction process of the voltage detection module 110 is to make the rectified voltage meet the working voltage range of the isolation module 130, so as to avoid the isolation module 130 from being burnt due to excessive voltage. When the silicon controlled rectifier is connected, the voltage at the two ends of the silicon controlled rectifier is close to zero voltage, the rectifying module 120 has no voltage input, the isolating module 130 has no voltage input, and the third end and the fourth end of the isolating module are disconnected; when the silicon controlled rectifier is disconnected, voltage drops exist at two ends of the silicon controlled rectifier, the voltage detected by the voltage detection module 110 is input to the rectification module 120 for rectification after being reduced, the rectification module 120 outputs direct current to the isolation module 130, the direct current can reach preset voltage in the isolation module 130, so that the isolation module 130 works, and the connection between the third end and the fourth end of the isolation module 130 is internally connected. Since the third terminals and the fourth terminals of the isolation module 130 are sequentially connected in series to the connection between the first terminal of the zero-crossing output module 140 and the ground, when all the thyristors are turned off, the first terminal of the zero-crossing output module 140 is grounded, and the zero-crossing output module 140 outputs a high level signal, i.e., a level signal corresponding to the zero-crossing point of the voltage. At this time, all thyristors in the zero crossing detection circuit 100 have been turned off, corresponding to voltage zero crossings where different voltage taps may be switched. In this way, when the voltage detection module 110 detects the voltages at two ends of the silicon controlled rectifier, the influence caused by different load types can be avoided when the input voltage is detected, the reliability of zero crossing detection is improved, and because the third ends and the fourth ends of all the isolation modules 130 are sequentially connected in series on the connection line between the first ends of the zero crossing output modules 140 and the ground, only when all the silicon controlled rectifiers in the circuit are disconnected, the first ends of the zero crossing output modules 140 are grounded, the zero crossing output modules 140 output level signals corresponding to the voltage zero crossing points, and therefore, after all the silicon controlled rectifiers are disconnected on a physical level, the zero crossing output modules 140 output the level signals corresponding to the voltage zero crossing points, and the reliability of zero crossing detection is further improved.
In implementation, the number of the thyristors in the zero crossing detection circuit 100 may be one or more, and the zero crossing detection circuit 100 including one thyristor is shown in fig. 1. The zero-crossing detection circuit 100 including a thyristor includes a thyristor, a voltage detection module 110, a rectification module 120, an isolation module 130, and a zero-crossing output module 140; the thyristor, the voltage detection module 110, the rectification module 120, and the isolation module 130 are sequentially connected, a third end of the isolation module 130 is connected to the first end of the zero-crossing output module 140, and a fourth end of the isolation module 130 is grounded. When the thyristor is turned on, the voltage at two ends of the thyristor is close to zero voltage, the rectifying module 120 has no voltage input, the isolating module 130 has no voltage input, the third end and the fourth end of the isolating module 130 are disconnected, and the zero-crossing output module 140 outputs a low level because the first end cannot be grounded; when the thyristor is disconnected, voltage drops exist at two ends of the thyristor, the voltage detected by the voltage detection module 110 is input to the rectification module 120 for rectification after being reduced, the rectification module 120 outputs direct current to the isolation module 130, the direct current reaches the preset voltage in the isolation module 130, so that the isolation module 130 works, the connection between the third end and the fourth end of the isolation module 130 is connected inside the isolation module 130, the first end of the zero-crossing output module 140 is grounded, and a high level corresponding to a zero-crossing point of the voltage is output. For the case where the zero-crossing detection circuit 100 includes a plurality of thyristors, taking the zero-crossing detection circuit 100 including three thyristors as an example, refer to fig. 2. The zero-crossing detection circuit 100 comprising three thyristors comprises three thyristors, three voltage detection modules 110, three rectification modules 120, three isolation modules 130 and a zero-crossing output module 140; each of the three thyristors is correspondingly provided with a voltage detection module 110, a rectification module 120 and an isolation module 130, and third ends and fourth ends of all the isolation modules 130 are sequentially connected in series on a wiring between the first end of the zero crossing output module 140 and the ground. When the silicon controlled rectifier is switched on, the voltage at two ends of the silicon controlled rectifier is close to zero voltage, the rectifying module 120 corresponding to the switched-on silicon controlled rectifier has no voltage input, the isolating module 130 corresponding to the switched-on silicon controlled rectifier has no voltage input, the third end and the fourth end of the isolating module 130 corresponding to the switched-on silicon controlled rectifier are disconnected, and the zero-crossing output module 140 outputs low level because the first end cannot be grounded; when the three thyristors are all disconnected, voltage drops exist at two ends of the three thyristors, the voltages at two ends of the thyristors detected by each voltage detection module 110 are input to the corresponding rectification module 120 for rectification treatment after being reduced, so that the rectification module 120 outputs direct current to the corresponding isolation module 130, the direct current reaches the preset voltage in the isolation module 130, the three isolation modules 130 all work, the connection between the third end and the fourth end of the three isolation modules 130 is connected internally, and the first end of the zero crossing output module 140 is grounded and outputs high level corresponding to the zero crossing point of the voltage.
In one possible implementation, referring to fig. 3, each voltage detection module 110 of the at least one voltage detection module 110 includes: a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4;
the first end of the first resistor R1 is connected with the first pole of the corresponding silicon controlled rectifier in the at least one silicon controlled rectifier, and the second end of the first resistor R1 is connected with the first end of the second resistor R2; the second end of the second resistor R2 is connected to the first end of the corresponding rectifying module 120 of the at least one rectifying module 120;
the first end of the third resistor R3 is connected with the second pole of the corresponding silicon controlled rectifier in the at least one silicon controlled rectifier, and the second end of the third resistor R3 is connected with the first end of the fourth resistor R4; the second end of the fourth resistor R4 is connected to the second end of the corresponding rectifying module 120 of the at least one rectifying module 120.
In practical applications, the voltage detection module 110 may include four resistors, and the number and the resistance of the resistors may be set according to the requirement. The more the number of the resistors is, the finer the resistance value of the resistors is set, the more accurate the voltage reduction is regulated, but excessive resistors can cause excessive occupation of circuit space, and the space utilization rate of the circuit is reduced. The resistance value of the resistor is set to be too large, and the voltage when the thyristor is disconnected is too high due to too low voltage, and the diode of the rear isolation module 130 cannot be conducted after rectification, so that the zero crossing output module 140 at the rear end always does not send a thyristor disconnection signal. The resistance value of the resistor is set to be too small, the voltage at two ends of the thyristor is not at zero point, and the diode of the isolation module 130 at the back is possibly conducted due to the too large voltage, so that the thyristor can send out a complete disconnection signal by mistake under the condition of incomplete disconnection.
In one possible embodiment, referring to fig. 4, each of the at least one rectifying modules 120 includes: a rectifier bridge;
the first input end of the rectifier bridge is connected with the third end of the corresponding voltage detection module 110 in the at least one voltage detection module 110, the second input end of the rectifier bridge is connected with the fourth end of the corresponding voltage detection module 110 in the at least one voltage detection module 110, the first output end of the rectifier bridge is connected with the first end of the corresponding isolation module 130 in the at least one isolation module 130, and the second output end of the rectifier bridge is connected with the second end of the corresponding isolation module 130 in the at least one isolation module 130.
In practical application, the rectifier bridge may be a controllable rectifier H-bridge or an uncontrollable rectifier H-bridge, which is not limited herein.
In one possible implementation, referring to fig. 5, each isolation module 130 of the at least one isolation module 130 includes: an optocoupler isolation device composed of a first light emitting diode D1 and a first triode Q1;
the anode of the first light emitting diode D1 is connected with the third end of the corresponding rectifying module 120 in the at least one rectifying module 120, and the cathode of the first light emitting diode D1 is connected with the fourth end of the corresponding rectifying module 120 in the at least one rectifying module 120;
the collector of the first triode Q1 serves as the third terminal of the isolation module 130, and the emitter of the first triode Q1 serves as the fourth terminal of the isolation module 130.
In practical applications, the optocoupler isolation device in the isolation module 130 may generally be formed of a first light emitting diode D1 and a first triode Q1 packaged together, when the voltage drop across the first light emitting diode D1 reaches the working voltage drop of the first light emitting diode D1, the first light emitting diode D1 emits light, and at this time, the first triode Q1 is turned on to connect the collector and the emitter thereof, i.e. the third end and the fourth end of the isolation module 130 are connected inside. The optocoupler isolation device formed by the first light emitting diode D1 and the first triode Q1 not only can conduct the connection between the third end and the fourth end of the isolation module 130 according to the voltage drop of the two ends of the first light emitting diode D1, but also has an electrical isolation function, and electrically isolates the circuit connected to one side of the first light emitting diode D1 from the circuit connected to one side of the first triode Q1.
In one possible implementation, referring to fig. 6, the zero crossing output module 140 includes: a fifth resistor R5, a sixth resistor R6, a seventh resistor R7 and a second triode Q2;
the first end of the fifth resistor R5 is connected with an external second power supply, and the second end of the fifth resistor R5 is respectively connected with the third end of the first isolation module 130 and the first end of the sixth resistor R6 in the at least one isolation module 130;
the second end of the sixth resistor R6 is connected with the base electrode of the second triode Q2;
the emitter of the second triode Q2 is connected with an external second power supply, the collector of the second triode Q2 is grounded through a seventh resistor R7, and a third end of the zero-crossing output module 140 is arranged on the connection between the collector of the second triode Q2 and the seventh resistor R7.
In practical application, the fifth resistor R5 is a pull-up resistor, and is configured to keep the base of the second triode Q2 at a high level when no signal is completely turned off by the thyristor, and in the off state, R6 is a current limiting resistor, and is connected to GND when the signal is completely turned off by the thyristor, pull down the base of the second triode Q2, and turn on the second triode Q2. When the silicon controlled rectifier is turned on, the voltage at two ends of the silicon controlled rectifier is close to zero voltage, so that the isolation module 130 corresponding to the turned-on silicon controlled rectifier has no voltage input, the third end of the isolation module 130 corresponding to the turned-on silicon controlled rectifier is disconnected from the fourth end, the second end of the fifth resistor R5 in the zero-crossing output module 140 cannot be connected with the ground, the second triode Q2 is cut off, and the third end of the zero-crossing output module 140 arranged on the wiring of the collector of the second triode Q2 and the seventh resistor R7 outputs a low level; when all thyristors in the zero-crossing detection circuit 100 are turned off, each isolation module 130 works, the second end of the fifth resistor R5 in the zero-crossing output module 140 is grounded, the second triode Q2 is turned on, and the third end of the zero-crossing output module 140, which is arranged on the connection between the collector of the second triode Q2 and the seventh resistor R7, outputs a high level.
In one possible implementation, referring to fig. 7, the zero-crossing detection circuit 100 further includes: at least one snubber circuit 150;
a first end of each of the at least one snubber circuits 150 is connected to a first pole of a corresponding one of the at least one thyristors, and a second end of each of the at least one snubber circuits 150 is connected to a second pole of a corresponding one of the at least one thyristors; the absorption circuit 150 is used for suppressing the voltage surge of the thyristor and preventing the thyristor from being triggered by mistake.
In practical applications, the absorption circuit 150 is mainly used to prevent the voltage rising rate from being too high, ensure the safe operation of the scr, and avoid false triggering of the scr. The absorption circuit 150 may be provided with a capacitor, a resistor, a diode, or the like to achieve the absorption effect.
In one possible implementation, referring to fig. 8, each of the at least one snubber circuits 150 includes: an eighth resistor R8 and a capacitor C1;
the first end of the eighth resistor R8 is connected with the first pole of the corresponding silicon controlled rectifier in the at least one silicon controlled rectifier, the second end of the eighth resistor R8 is connected with the first end of the capacitor C1, and the second end of the capacitor C1 is connected with the second pole of the corresponding silicon controlled rectifier in the at least one silicon controlled rectifier.
In practical application, the eighth resistor R8 and the capacitor C1 form a rc absorption circuit, and the voltage rising rate can be limited by utilizing the characteristic that the voltages at the two ends of the capacitor C1 cannot be suddenly changed. The eighth resistor R8 can play a damping role to prevent the overvoltage appearing at the two ends of the capacitor C1 from damaging the silicon controlled rectifier due to the vibration in the circuit.
Based on the same conception, the embodiment of the utility model also provides a silicon controlled voltage stabilizing device, referring to fig. 9, which comprises: at least one zero crossing detection circuit 100, at least one driving module 210, a winding module 220 and a control module 230 according to the embodiment of the present utility model; a first end of each zero crossing detection circuit 100 of the at least one zero crossing detection circuit 100 is connected to a first end of a corresponding driving module 210 of the at least one driving module 210, a second end of each zero crossing detection circuit 100 of the at least one zero crossing detection circuit 100 is connected to a first end of the winding module 220, and a third end of each zero crossing detection circuit 100 of the at least one zero crossing detection circuit 100 is connected to a first end of the control module 230; a second end of each of the at least one driving module 210 is connected to a second end of the control module 230, and a third end of each of the at least one driving module 210 is connected to an external third power source; the second end 220 of the winding module is connected to an external ac voltage.
In practical applications, the external third power supply provides +5v voltage, and the external ac voltage Vin provides the input voltage of the scr voltage stabilizing device. The winding module 220 includes a winding with multiple taps, and the taps are connected with the thyristors in the zero crossing detection circuit 100, and the connected voltage taps can be switched through reasonable on-off control of the thyristors, so as to realize the change of the connected winding, and further enable the thyristor voltage stabilizing device to output different output voltages. When the voltage taps of the silicon controlled rectifier voltage stabilizer are switched, the voltage tap must be switched at the zero crossing point, so that the minimum impact can be ensured, and the service life of components is prolonged. The zero-crossing detection circuit 100 is used for detecting voltages at two ends of the thyristors to determine that under the condition that all the thyristors in the thyristor voltage stabilizer are turned off, a level signal corresponding to a voltage zero-crossing point is output, so that the control module 230 can immediately send a conduction signal of the corresponding thyristor to be switched to the driving module 210 after receiving the level signal corresponding to the voltage zero-crossing point, and the driving module 210 drives the corresponding thyristor to conduct. In this way, the voltage at two ends of the silicon controlled rectifier is detected through the zero crossing detection circuit 100, and a level signal corresponding to the zero crossing point of the voltage is output under the condition that all the silicon controlled rectifiers are turned off, so that the reliability of zero crossing detection is improved, meanwhile, the switching reliability of the silicon controlled rectifier voltage stabilizing device is further improved, in addition, the control module 230 of the silicon controlled rectifier voltage stabilizing device immediately sends a corresponding silicon controlled rectifier conduction signal to be switched to the driving module 210 when detecting the level signal corresponding to the zero crossing point of the voltage, the switching action can be completed rapidly, and the continuity of the output waveform of the silicon controlled rectifier voltage stabilizing device is maintained on the basis that the triggering of the silicon controlled rectifier after being turned off is ensured.
In one possible embodiment, referring to fig. 10, each of the at least one driving module includes: a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, an optocoupler isolation device, a second light emitting diode D2, and a third transistor Q3;
the first end of the optical coupler isolation device is connected with an external third power supply, the second end of the optical coupler isolation device is connected with the control module, the third end of the optical coupler isolation device is connected with the external first power supply, and the fourth end of the optical coupler isolation device is connected with the base electrode of the third triode Q3 through a ninth resistor R9;
the emitter of the third triode Q3 is connected with the ground, and the third triode Q3 is connected with an external first power supply through a second light emitting diode D2 and a tenth resistor R10 in sequence;
the first end of the eleventh resistor R11 is connected with the base electrode of the third triode Q3, and the second end of the eleventh resistor R11 is connected with the emitter electrode of the third triode Q3;
the first end of the twelfth resistor R12 is connected with the collector electrode of the third triode Q3, and the second end of the twelfth resistor R12 is connected with the control electrode of the corresponding silicon controlled rectifier of the corresponding zero-crossing detection circuit in the at least one zero-crossing detection circuit;
the first end of the thirteenth resistor R13 is connected to the external first power source, and the second end of the thirteenth resistor R13 is connected to the second end of the twelfth resistor R12.
In practical application, the optocoupler isolation device plays a role in electrical isolation, and the ninth resistor R9 is a current limiting resistor, and is used for limiting the current input to the third triode Q3 and preventing the third triode Q3 from being damaged due to overlarge current. The tenth resistor R10 is a bias resistor for supplying a suitable current to the collector of the third transistor Q3. The second light emitting diode D2 plays an indicating role in indicating the connection with the external first power supply. The eleventh resistor R11 is a pull-down resistor for pulling down the level to a low level, preventing malfunction of the third transistor Q3. The twelfth resistor R12 and the thirteenth resistor R13 are current limiting resistors. When the optical coupler isolation device receives the conducting signal, the third end and the fourth end of the optical coupler isolation device are conducted, the base electrode of the third triode Q3 is conducted in a high level, and the control electrode and the first electrode of the controllable silicon are conducted due to the fact that pressure difference exists.
In one possible embodiment, the winding module comprises: a primary winding module and a secondary winding module;
the primary winding module and the secondary winding module are respectively connected with different zero-crossing detection circuits; the primary winding module is connected with external alternating voltage.
In the silicon controlled rectifier voltage stabilizing device provided by the embodiment of the utility model, the zero-crossing detection circuit can improve the reliability of zero-crossing detection, so that the silicon controlled rectifier voltage stabilizing device using the zero-crossing detection circuit also has corresponding advantages. In addition, the controllable silicon voltage stabilizing device further improves the switching reliability of the controllable silicon voltage stabilizing device, can rapidly complete switching action, and keeps the continuity of output waveforms of the controllable silicon voltage stabilizing device on the basis of guaranteeing that the controllable silicon is triggered after being turned off.
While preferred embodiments of the present utility model have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the utility model.
It will be apparent to those skilled in the art that various modifications and variations can be made to the embodiments of the present utility model without departing from the spirit or scope of the embodiments of the utility model. Thus, if such modifications and variations of the embodiments of the present utility model fall within the scope of the claims and the equivalents thereof, the present utility model is also intended to include such modifications and variations.
Claims (10)
1. A zero-crossing detection circuit, comprising: the device comprises at least one silicon controlled rectifier, at least one voltage detection module, at least one rectification module, at least one isolation module and a zero crossing output module;
the first poles of the at least one silicon controlled rectifier are connected with an external first power supply; the first end of each voltage detection module in the at least one voltage detection module is connected with the first pole of the corresponding silicon controlled rectifier in the at least one silicon controlled rectifier, the second end of each voltage detection module in the at least one voltage detection module is connected with the second pole of the corresponding silicon controlled rectifier in the at least one silicon controlled rectifier, the third end of each voltage detection module in the at least one voltage detection module is connected with the first end of the corresponding rectification module in the at least one rectification module, and the fourth end of each voltage detection module in the at least one voltage detection module is connected with the second end of the corresponding rectification module in the at least one rectification module; the voltage detection module is used for detecting the voltage at two ends of the connected silicon controlled rectifier and reducing the voltage;
the third end of each rectifying module in the at least one rectifying module is connected with the first end of the corresponding isolating module in the at least one isolating module, and the fourth end of each rectifying module in the at least one rectifying module is connected with the second end of the corresponding isolating module in the at least one isolating module; the rectification module is used for converting the voltage reduced by the voltage detection module into direct-current voltage;
the third end of a first isolation module in the at least one isolation module is connected with the first end of the zero-crossing output module, the third end of the isolation module except the first isolation module in the at least one isolation module is connected with the fourth end of the previous isolation module, and the fourth end of the last isolation module in the at least one isolation module is grounded; the isolation module is used for connecting the third end and the fourth end of the isolation module when the input direct-current voltage reaches a preset voltage;
the second end of the zero-crossing output module is connected with an external second power supply, and the third end of the zero-crossing output module is connected with an external controller; and the zero-crossing output module is used for outputting a level signal corresponding to a voltage zero-crossing point when the connection between the third end and the fourth end of all the isolation modules is switched on.
2. The zero crossing detection circuit of claim 1, wherein each of the at least one voltage detection modules comprises: a first resistor, a second resistor, a third resistor and a fourth resistor;
the first end of the first resistor is connected with the first pole of the corresponding silicon controlled rectifier in the at least one silicon controlled rectifier, and the second end of the first resistor is connected with the first end of the second resistor; the second end of the second resistor is connected with the first end of the corresponding rectifying module in the at least one rectifying module;
the first end of the third resistor is connected with the second pole of the corresponding silicon controlled rectifier in the at least one silicon controlled rectifier, and the second end of the third resistor is connected with the first end of the fourth resistor; and the second end of the fourth resistor is connected with the second end of the corresponding rectifying module in the at least one rectifying module.
3. The zero crossing detection circuit of claim 1, wherein each of the at least one rectifier module comprises: a rectifier bridge;
the first input end of the rectifier bridge is connected with the third end of the corresponding voltage detection module in the at least one voltage detection module, the second input end of the rectifier bridge is connected with the fourth end of the corresponding voltage detection module in the at least one voltage detection module, the first output end of the rectifier bridge is connected with the first end of the corresponding isolation module in the at least one isolation module, and the second output end of the rectifier bridge is connected with the second end of the corresponding isolation module in the at least one isolation module.
4. The zero crossing detection circuit of claim 1, wherein each of the at least one isolation module comprises: an optical coupler isolation device formed by a first light emitting diode and a first triode;
the anode of the first light-emitting diode is connected with the third end of the corresponding rectifying module in the at least one rectifying module, and the cathode of the first light-emitting diode is connected with the fourth end of the corresponding rectifying module in the at least one rectifying module;
the collector of the first triode is used as the third end of the isolation module, and the emitter of the first triode is used as the fourth end of the isolation module.
5. The zero crossing detection circuit of claim 1, wherein the zero crossing output module comprises: the fifth resistor, the sixth resistor, the seventh resistor and the second triode;
the first end of the fifth resistor is connected with the external second power supply, and the second end of the fifth resistor is respectively connected with the third end of the first isolation module in the at least one isolation module and the first end of the sixth resistor;
the second end of the sixth resistor is connected with the base electrode of the second triode;
the emitter of the second triode is connected with the external second power supply, the collector of the second triode is grounded through the seventh resistor, and a third end of the zero-crossing output module is arranged on the connection wire of the collector of the second triode and the seventh resistor.
6. The zero crossing detection circuit of any of claims 1-5, further comprising: at least one absorption circuit;
the first end of each absorption circuit in the at least one absorption circuit is connected with the first pole of the corresponding silicon controlled rectifier in the at least one silicon controlled rectifier, and the second end of each absorption circuit in the at least one absorption circuit is connected with the second pole of the corresponding silicon controlled rectifier in the at least one silicon controlled rectifier; the absorption circuit is used for inhibiting voltage surge of the silicon controlled rectifier and preventing the silicon controlled rectifier from being triggered by mistake.
7. The zero crossing detection circuit of claim 6, wherein each of the at least one snubber circuits comprises: eighth resistor and capacitor;
the first end of the eighth resistor is connected with the first pole of the corresponding silicon controlled rectifier in the at least one silicon controlled rectifier, the second end of the eighth resistor is connected with the first end of the capacitor, and the second end of the capacitor is connected with the second pole of the corresponding silicon controlled rectifier in the at least one silicon controlled rectifier.
8. A thyristor voltage regulator apparatus, comprising: at least one zero crossing detection circuit according to any one of claims 1-7, at least one drive module, a winding module, a control module; a first end of each zero-crossing detection circuit of the at least one zero-crossing detection circuit is connected with a first end of a corresponding driving module of the at least one driving module, a second end of each zero-crossing detection circuit of the at least one zero-crossing detection circuit is connected with a first end of the winding module, and a third end of each zero-crossing detection circuit of the at least one zero-crossing detection circuit is connected with a first end of the control module; the second end of each driving module in the at least one driving module is connected with the second end of the control module, and the third end of each driving module in the at least one driving module is connected with an external third power supply; the second end of the winding module is connected with external alternating voltage.
9. The scr voltage regulator apparatus of claim 8, wherein each of the at least one drive module comprises: a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, an optocoupler isolation device, a second light emitting diode and a third triode;
the first end of the optocoupler isolation device is connected with the external third power supply, the second end of the optocoupler isolation device is connected with the control module, the third end of the optocoupler isolation device is connected with the external first power supply, and the fourth end of the optocoupler isolation device is connected with the base electrode of the third triode through the ninth resistor;
the emitter of the third triode is connected with the ground, and the third triode is connected with the external first power supply through the second light emitting diode and the tenth resistor in sequence;
the first end of the eleventh resistor is connected with the base electrode of the third triode, and the second end of the eleventh resistor is connected with the emitter electrode of the third triode;
the first end of the twelfth resistor is connected with the collector electrode of the third triode, and the second end of the twelfth resistor is connected with the control electrode of the corresponding silicon controlled rectifier of the corresponding zero-crossing detection circuit in the at least one zero-crossing detection circuit;
the first end of the thirteenth resistor is connected with the external first power supply, and the second end of the thirteenth resistor is connected with the second end of the twelfth resistor.
10. The scr voltage stabilizing device according to claim 8 or 9, wherein the winding module comprises: a primary winding module and a secondary winding module;
the primary winding module and the secondary winding module are respectively connected with different zero-crossing detection circuits; the primary winding module is connected with the external alternating voltage.
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|---|---|---|---|
| CN202320415073.1U CN219475718U (en) | 2023-03-07 | 2023-03-07 | Zero-crossing detection circuit and silicon controlled rectifier voltage stabilizing equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320415073.1U CN219475718U (en) | 2023-03-07 | 2023-03-07 | Zero-crossing detection circuit and silicon controlled rectifier voltage stabilizing equipment |
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