A thyristor detection drive circuit, circuit board, and electronic device

Abstract

This application discloses a thyristor detection and driving circuit, circuit board, and electronic device. The circuit includes a main control chip, a logic control module, a start-stop circuit, a thyristor trigger circuit, a zero-crossing detection circuit, and a phase sequence detection circuit. Each of the thyristor trigger circuit, zero-crossing detection circuit, and phase sequence detection circuit has three groups. The logic control module includes at least three logic sub-modules. The control terminal of the start-stop circuit is connected to the main control chip, and its signal terminal is connected to one input terminal of each of the three logic sub-modules. The control terminal of each group of thyristor trigger circuits is connected to the output terminal of the corresponding logic sub-module, and the output terminals of the thyristor trigger circuits are used to connect to the corresponding thyristor terminals. The main control chip is used to adjust the triggering timing of the corresponding start-stop circuit based on the acquisition signal of the zero-crossing detection circuit, and to adjust the triggering sequence of each thyristor trigger circuit based on the acquisition signal of the phase sequence detection circuit. This application can improve the stability of circuit operation.

Description

Technical Field

[0001] This application relates to the field of drive circuit technology, and in particular to a thyristor detection drive circuit, circuit board, and electronic device. Background Technology

[0002] Existing motor control methods derived from Nora controllers connect a thyristor (SCR) between each phase of the three-phase motor's power input line and its corresponding input terminal. The power input lines are typically three-phase. To control each thyristor, this method employs a phase detector, a associated ramp generator, a signal conditioning circuit, a comparator, and finally a control gate that generates switching signals for the thyristors. This control method causes severe motor vibration. Furthermore, existing motor controllers typically use only one phase detector and a fixed resistor network to sample the voltage, assuming the voltage at the thyristor's power input terminal is higher than the voltage at the motor's input terminal. This method often deviates from reality, and due to the simplistic detection method, the acquired signal is prone to deviation from reality, leading to drastic changes in the thyristor's trigger signal, repeated changes in the thyristor's conduction angle, and ultimately, motor instability. Summary of the Invention

[0003] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes a thyristor detection drive circuit, circuit board, and electronic device that can improve the stability of circuit operation.

[0004] In a first aspect, this application provides a thyristor detection driving circuit, including a main control chip, a logic control module, a start / stop circuit, a thyristor trigger circuit, a zero-crossing detection circuit, and a phase sequence detection circuit; the thyristor trigger circuit, the zero-crossing detection circuit, and the phase sequence detection circuit are each provided in three sets.

[0005] The logic control module includes at least three logic sub-modules. Each logic sub-module is used to change the level state of its corresponding output terminal according to the level state of its first input terminal and second input terminal. The first input terminal of each logic sub-module is connected to the main control chip.

[0006] The control terminal of the start-stop circuit is connected to the main control chip, and its signal terminal is connected to the second input terminal of the three logic sub-modules respectively.

[0007] The control terminal of each group of the thyristor trigger circuits is connected to the output terminal of the corresponding logic submodule, and the output terminal of the thyristor trigger circuits is used to connect to the corresponding thyristor terminals.

[0008] The acquisition terminals of each zero-crossing detection circuit and the phase sequence detection circuit are respectively connected to the first and second acquisition terminals of the corresponding thyristor trigger circuit, and the output terminals of the zero-crossing detection circuit and the phase sequence detection circuit are respectively connected to the main control chip.

[0009] The main control chip is used to adjust the triggering timing of the trigger signal corresponding to the start / stop circuit according to the acquisition signal of the zero-crossing detection circuit, and to adjust the triggering order of each thyristor trigger circuit according to the acquisition signal of the phase sequence detection circuit.

[0010] The thyristor detection and driving circuit according to the first aspect of this application has at least the following beneficial effects: It achieves coordinated control through a main control chip, a logic control module, three sets of thyristor trigger circuits, a zero-crossing detection circuit, and a phase sequence detection circuit. The main control chip outputs a signal to the logic control module, which controls the on / off state of the trigger circuit via a start / stop circuit. The trigger circuit generates a high-frequency signal and couples it to the thyristor terminal through a transformer to drive the thyristor to conduct. The zero-crossing detection circuit collects the zero-crossing signal of each phase AC current in real time and feeds it back to the main control chip. The main control chip adjusts the triggering timing of the trigger circuit accordingly to ensure that the thyristor conducts when the voltage crosses zero. The phase sequence detection circuit collects the phase difference signal of the three-phase voltage through three sets of optocouplers. After analysis, the main control chip adaptively adjusts the triggering sequence of the three sets of trigger circuits to correct phase sequence abnormalities. The zero-crossing detection circuit and the phase sequence detection circuit provide real-time feedback on the triggering timing and triggering sequence, respectively. The main control chip combines dual feedback to dynamically optimize the control strategy, avoiding switching losses and electromagnetic interference caused by non-zero-crossing triggering of the thyristor, and ensuring three-phase current balance through adaptive phase sequence adjustment.

[0011] According to some embodiments of the first aspect of this application, the thyristor trigger circuit includes a high-frequency signal generation circuit, a transformer, and a first filter module. The input terminal of the high-frequency signal generation circuit is used to connect to an external power supply, its control terminal is connected to the output terminal of the corresponding logic submodule, and its output terminal is connected to the primary winding of the transformer. The primary winding and the secondary winding of the transformer are respectively connected to the corresponding thyristor terminals through the first filter module.

[0012] According to some embodiments of the first aspect of this application, the high-frequency signal generating circuit includes a first capacitor, a first resistor, a second resistor, a first switching transistor, a first diode, and a second diode. The control terminal of the first switching transistor is connected to the output terminal of the corresponding logic submodule through the first resistor. The first resistor and the first switching transistor are grounded through the second resistor. The output terminal of the first switching transistor is grounded. The anode of the first diode is connected to an external power supply. The cathode of the first diode is connected to the cathode of the second diode. The anode of the second diode is connected to the input terminal of the first switching transistor. The two ends of the primary winding of the transformer are respectively connected to the anode of the first diode and the anode of the second diode. The anode of the first diode is also grounded through the first capacitor.

[0013] According to some embodiments of the first aspect of this application, the first filtering module includes a third diode, a fourth diode, a fifth diode, a sixth diode, a third resistor, and a fourth resistor;

[0014] The first end of the primary winding of the transformer is connected to the anode of the third diode and one end of the third resistor, respectively. Its second end is connected to the anode of the fourth diode. The cathode of the fourth diode is connected to the cathode of the third diode and the other end of the third resistor, respectively. The first end of the primary winding and the cathode of the fourth diode are connected to two control terminals of the corresponding thyristor terminals, respectively.

[0015] The first end of the secondary winding of the transformer is connected to the anode of the fifth diode and one end of the fourth resistor, and its second end is connected to the anode of the sixth diode. The cathode of the sixth diode is connected to the cathode of the fifth diode and the other end of the fourth resistor. The first end of the secondary winding and the cathode of the sixth diode are connected to the other two control terminals of the corresponding thyristor terminals.

[0016] According to some embodiments of the first aspect of this application, the start-stop circuit includes a second switching transistor, a fifth resistor, a sixth resistor, a seventh resistor, a seventh diode, and a second capacitor;

[0017] The input terminal of the second switching transistor is connected to an external power supply through the fifth resistor, its output terminal is grounded, and it is connected to the control terminal through the sixth resistor. The anode of the seventh diode is connected to the output terminal of the second switching transistor, the cathode of the seventh diode is connected to the control terminal of the second switching transistor, and it is connected to the main control chip in sequence through the second capacitor and the seventh resistor. The signal terminal of the start / stop circuit is located between the fifth resistor and the input terminal of the second switching transistor.

[0018] According to some embodiments of the first aspect of this application, the zero-crossing detection circuit includes an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a third capacitor, a fourth capacitor, a third switching transistor, and a first optocoupler controller.

[0019] The positive terminal of the first optocoupler controller is connected to the first end of the corresponding second-stage winding, and its negative terminal is connected to the first end of the corresponding first-stage winding through the eighth resistor, and to the first end of the corresponding second-stage winding through the third capacitor and the ninth resistor, respectively. Its collector is connected to the input terminal of the third switching transistor, and to an external power supply through the tenth resistor and to the main control chip through the eleventh resistor, respectively. Its emitter is connected to the control terminal of the third switching transistor, and the eleventh resistor and the main control chip are grounded through the fourth capacitor. The output terminal of the third switching transistor is grounded and connected to its control terminal through the twelfth resistor.

[0020] According to some embodiments of the first aspect of this application, the phase sequence detection circuit includes a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, an eighth diode, a fifth capacitor, a sixth capacitor, a seventh capacitor, and a second optocoupler controller.

[0021] The positive terminal of the second optocoupler controller is connected to the first end of the corresponding second stage winding through the thirteenth resistor, to its negative terminal through the fifth capacitor, and to the cathode of the eighth diode. Its negative terminal is connected to the anode of the eighth diode. Its collector is connected to the external power supply through the fourteenth resistor and to the main control chip through the fifteenth resistor. Its emitter is grounded. The fourteenth resistor and the external power supply are grounded through the sixth capacitor, and the fifteenth resistor and the main control chip are grounded through the seventh capacitor.

[0022] The anodes of the eighth diodes in the three sets of phase sequence detection circuits are connected.

[0023] According to some embodiments of the first aspect of this application, the first input terminal of each logic submodule is connected to the main control chip, and the first input terminal of the logic submodule and the main control chip are connected to an external power supply through a sixteenth resistor.

[0024] Secondly, this application also provides a circuit board including a thyristor detection drive circuit as described in any embodiment of the first aspect.

[0025] Thirdly, this application also provides an electronic device, including the circuit board described in the second aspect embodiment.

[0026] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0027] Additional aspects and advantages of this application will become apparent and readily understood in conjunction with the following description of the embodiments, in which:

[0028] Figure 1 A circuit diagram of a thyristor detection drive circuit provided for some embodiments of the first aspect of this application. Detailed Implementation

[0029] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0030] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0031] In the description of this application, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0032] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0033] Existing motor control methods derived from Nora controllers connect a thyristor (SCR) between each phase of the three-phase motor's power input line and its corresponding input terminal. The power input lines are typically three-phase. To control each thyristor, this method employs a phase detector, a associated ramp generator, a signal conditioning circuit, a comparator, and finally a control gate to generate switching signals for the thyristors. This control method causes severe motor vibration. Furthermore, existing motor controllers typically use only one phase detector and a fixed resistor network to sample the voltage, assuming the voltage at the thyristor's power input terminal is higher than the voltage at the motor's input terminal. This method often deviates from reality, and due to the simplistic detection method, the acquired signal is prone to deviation from reality, leading to drastic changes in the thyristor's trigger signal, repeated changes in the thyristor's conduction angle, and ultimately, motor instability.

[0034] Based on this, this application provides a thyristor detection drive circuit, circuit board, and electronic device to solve the aforementioned technical problems. The technical solutions provided by this application will be described in detail below.

[0035] Reference Figure 1 This application provides a thyristor detection driving circuit, including a main control chip, a logic control module U1, a start / stop circuit, a thyristor trigger circuit, a zero-crossing detection circuit, and a phase sequence detection circuit; the thyristor trigger circuit, the zero-crossing detection circuit, and the phase sequence detection circuit are each provided in three groups; the logic control module U1 includes at least three logic sub-modules, which are used to change the level state of the corresponding output terminal according to the level state of their first input terminal and second input terminal, and the first input terminal of each logic sub-module is connected to the main control chip; the control terminal of the start / stop circuit is connected to the main control chip, and its signal terminal is connected to the second input terminal of each of the three logic sub-modules; each group The control terminals of the thyristor trigger circuits are connected to the output terminals of the corresponding logic submodules, and the output terminals of the thyristor trigger circuits are used to connect to the corresponding thyristor terminals JP1. The acquisition terminals of each zero-crossing detection circuit and the phase sequence detection circuit are connected to the first and second acquisition terminals of the corresponding thyristor trigger circuits, respectively. The output terminals of the zero-crossing detection circuits and the phase sequence detection circuits are connected to the main control chip. The main control chip is used to adjust the triggering timing of the triggering signal of the corresponding start / stop circuit according to the acquisition signal of the zero-crossing detection circuit, and to adjust the triggering sequence of each thyristor trigger circuit according to the acquisition signal of the phase sequence detection circuit.

[0036] In the circuit of this application, coordinated control is achieved through a main control chip, a logic control module U1, three sets of thyristor trigger circuits, a zero-crossing detection circuit, and a phase sequence detection circuit. The main control chip outputs a signal to the logic control module U1, which controls the on / off state of the trigger circuits via a start / stop circuit. The trigger circuits generate high-frequency signals, which are coupled to the thyristor terminal JP1 via a transformer to drive the thyristor to conduct. The zero-crossing detection circuit collects the zero-crossing signals of each phase AC current in real time and feeds them back to the main control chip. The main control chip adjusts the triggering timing of the trigger circuits accordingly to ensure that the thyristor conducts when the voltage crosses zero. The phase sequence detection circuit collects the phase difference signals of the three-phase voltages through three sets of optocouplers. After analysis, the main control chip adaptively adjusts the triggering sequence of the three sets of trigger circuits to correct phase sequence abnormalities. The zero-crossing detection circuit and the phase sequence detection circuit provide real-time feedback on the triggering timing and triggering sequence, respectively. The main control chip combines dual feedback to dynamically optimize the control strategy, which avoids switching losses and electromagnetic interference caused by non-zero-crossing triggering of the thyristors, and ensures three-phase current balance through adaptive phase sequence adjustment.

[0037] It should be noted that the main control chip is a 32-bit microprocessor chip, the thyristor terminal JP1 is connected to the four control electrodes of the thyristor, and the logic control module U1 is a CD74AC02 chip.

[0038] It should be noted that the three sets of thyristor triggering circuits, zero-crossing detection circuits, and phase sequence detection circuits in the three-phase circuit have the same specific structure. The circuit structure of one phase will be explained in detail below.

[0039] It is understood that the thyristor trigger circuit includes a high-frequency signal generation circuit, a transformer, and a first filter module. The input terminal of the high-frequency signal generation circuit is used to connect to an external power supply, its control terminal is connected to the output terminal of the corresponding logic submodule, and its output terminal is connected to the primary winding of the transformer. The primary winding and the secondary winding of the transformer are respectively connected to the corresponding thyristor terminal JP1 through the first filter module.

[0040] Under the control of the logic submodule's output signal, the high-frequency signal generation circuit converts the electrical energy input from the external power supply into a high-frequency pulse signal. This signal is coupled through the primary winding of the transformer to the first and second windings, and then filtered by the first filter module to remove high-frequency noise and interference signals. Finally, a clean trigger signal is output to the thyristor terminal JP1, driving the thyristor to conduct. The high-frequency signal generation circuit can precisely control the thyristor conduction angle by adjusting the pulse frequency and duty cycle, achieving dynamic voltage regulation. The electromagnetic coupling effect of the transformer can effectively isolate strong and weak current circuits, preventing interference and surge impacts between the drive circuit and the main circuit. The first filter module further purifies the trigger signal, avoiding false triggering of the thyristor due to signal distortion. The coordinated operation of these three components can improve the stability and reliability of the trigger signal, reduce switching losses, and enhance the circuit's anti-interference capability, ensuring that the thyristor can accurately respond to trigger commands even in complex power grid environments.

[0041] Reference Figure 1 It can be understood that the high-frequency signal generation circuit includes a first capacitor C1, a first resistor R1, a second resistor R2, a first switch Q1, a first diode D1, and a second diode D2. The control terminal of the first switch Q1 is connected to the output terminal of the corresponding logic submodule through the first resistor R1. The first resistor R1 and the first switch Q1 are grounded through the second resistor R2. The output terminal of the first switch Q1 is grounded. The anode of the first diode D1 is used to connect to an external power supply. The cathode of the first diode D1 is connected to the cathode of the second diode D2. The anode of the second diode D2 is connected to the input terminal of the first switch Q1. The two ends of the primary winding of the transformer are connected to the anodes of the first diode D1 and the second diode D2, respectively. The anode of the first diode D1 is also grounded through the first capacitor C1.

[0042] It should be noted that the first switching transistor Q1 can be an NPN transistor.

[0043] When the logic submodule outputs a high level, current flows through the first resistor R1 to drive the first switch Q1 to conduct. At this time, the external power supply forms a loop through the first diode D1, the second diode D2, the primary winding of the transformer, and the conducting first switch Q1, storing electrical energy in the transformer. When the logic submodule outputs a low level, the first switch Q1 is turned off, and the back electromotive force generated by the primary winding of the transformer freewheels through the second diode D2. Simultaneously, the first capacitor C1 and the primary winding form a resonant circuit, maintaining current continuity and generating a high-frequency oscillation signal. Through the cooperation of the first diode D1 and the second diode D2, both the external power supply to the transformer is achieved, and a freewheeling path is provided for the back electromotive force, preventing the switch from being subjected to excessive voltage. In addition, the resonant circuit formed by the first capacitor C1 and the primary winding can generate a high-frequency pulse signal, eliminating the need for an additional oscillation circuit and simplifying the design. At the same time, the second resistor R2 provides voltage divider protection for the control terminal of the switch, preventing damage from overvoltage. The circuit structure described above generates high-frequency signals through passive components, featuring low power consumption, fast response, and high stability. It can precisely control the triggering timing of the thyristor, thereby improving the circuit's anti-interference capability and energy efficiency ratio.

[0044] Continue to refer to Figure 1 It is understood that the first filter module includes a third diode D3, a fourth diode D4, a fifth diode D5, a sixth diode D6, a third resistor R3, and a fourth resistor R4. The first end of the primary winding of the transformer is connected to the anode of the third diode D3 and one end of the third resistor R3, and its second end is connected to the anode of the fourth diode D4. The cathode of the fourth diode D4 is connected to the cathode of the third diode D3 and the other end of the third resistor R3. The first end of the primary winding and the cathode of the fourth diode D4 are connected to two control terminals of the corresponding thyristor terminal JP1. The first end of the secondary winding of the transformer is connected to the anode of the fifth diode D5 and one end of the fourth resistor R4, and its second end is connected to the anode of the sixth diode D6. The cathode of the sixth diode D6 is connected to the cathode of the fifth diode D5 and the other end of the fourth resistor R4. The first end of the secondary winding and the cathode of the sixth diode D6 are connected to the other two control terminals of the corresponding thyristor terminal JP1.

[0045] It should be noted that the third diode D3 and the fifth diode D5 are Schottky diodes.

[0046] The signal output from the primary winding of the transformer is rectified by diodes D3 and D4, and then current-limited and filtered by resistor R3, transmitting a clean positive pulse signal to the two control terminals of the thyristor terminal JP1. Similarly, the signal output from the secondary winding is rectified by diodes D5 and D6, and then current-limited and filtered by resistor R4, transmitting another set of positive pulse signals to the other two control terminals of the thyristor terminal JP1. Through two independent rectifier and filter circuits, the high-frequency signal output from the transformer is converted into the trigger pulse required by the thyristor, ensuring the stability of the trigger signal. The rectification effect of the diodes eliminates negative voltage, preventing false triggering of the thyristor. Furthermore, the current-limiting and filtering function of the resistors suppresses high-frequency interference, smooths the pulse waveform, and reduces electromagnetic noise. The two independent circuits drive different control terminals of the thyristor, achieving redundant design of the trigger signal and improving trigger reliability. This circuit structure ensures both the accuracy of thyristor triggering and enhances anti-interference capability.

[0047] Continue to refer to Figure 1 As can be understood, the start-stop circuit includes a second switch Q2, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a seventh diode D7, and a second capacitor C2. The input terminal of the second switch Q2 is connected to the external power supply through the fifth resistor R5, and its output terminal is grounded and connected to the control terminal through the sixth resistor R6. The anode of the seventh diode D7 is connected to the output terminal of the second switch Q2, and the cathode of the seventh diode D7 is connected to the control terminal of the second switch Q2. Both diodes are connected to the main control chip through the second capacitor C2 and the seventh resistor R7. The signal terminal of the start-stop circuit is located between the fifth resistor R5 and the input terminal of the second switch Q2. The second switch Q2 can be an N-channel enhancement-mode MOSFET. Through this circuit structure, smooth start-stop control of the logic submodule is achieved, effectively suppressing inrush current, enhancing circuit stability and anti-interference capabilities, and extending the lifespan of components.

[0048] Continue to refer to Figure 1It can be understood that the zero-crossing detection circuit includes an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a third capacitor C3, a fourth capacitor C4, a third switch Q3, and a first optocoupler controller U2. The positive terminal of the first optocoupler controller U2 is connected to the first end of the corresponding second stage winding, and its negative terminal is connected to the first end of the corresponding first stage winding through the eighth resistor R8, and to the first end of the corresponding second stage winding through the third capacitor C3 and the ninth resistor R9. Its collector is connected to the input terminal of the third switch Q3, and to the external power supply through the tenth resistor R10 and to the main control chip through the eleventh resistor R11. Its emitter is connected to the control terminal of the third switch Q3, and the eleventh resistor R11 and the main control chip are grounded through the fourth capacitor C4. The output terminal of the third switch Q3 is grounded and connected to its control terminal through the twelfth resistor R12.

[0049] The third switch Q3 can be an NPN transistor. When the AC current is not in a zero-crossing state, the voltage between the first terminal of the secondary winding and the first terminal of the primary winding of the transformer creates a current path between the positive and negative terminals of the first optocoupler controller U2. The internal LED of the first optocoupler controller U2 is turned on, driving the collector to output a low level. The third switch Q3 is turned off because its base receives a low level. The main control chip receives a high-level signal through the eleventh resistor R11. When the AC current approaches the zero-crossing point, the voltage across the two terminals decreases, the input current of the first optocoupler controller U2 decreases until it is turned off, the collector outputs a high level, the base of the third switch Q3 receives a high level and is turned on, and the main control chip receives a low-level signal, thereby realizing the capture of the zero-crossing signal. In this circuit, the eighth resistor R8 provides current limiting protection for the input of the first optocoupler controller U2; the third capacitor C3 and the ninth resistor R9 form an RC filter network to eliminate high-frequency interference; the tenth resistor R10 provides a pull-up power supply for the optocoupler collector; the fourth capacitor C4 filters out noise from the input of the main control chip; and the twelfth resistor R12 provides bias stability for the third switch Q3. This circuit structure enables precise triggering of the thyristor at the zero-crossing voltage point, effectively reducing switching losses and electromagnetic interference, and improving circuit operational stability.

[0050] Continue to refer to Figure 1It is understood that the phase sequence detection circuit includes a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, an eighth diode D8, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, and a second optocoupler controller U3. The positive terminal of the second optocoupler controller U3 is connected to the first end of the corresponding second stage winding through the thirteenth resistor R13, to its negative terminal through the fifth capacitor C5, and to the cathode terminal of the eighth diode D8. Its negative terminal is connected to the anode terminal of the eighth diode D8. Its collector is connected to the external power supply through the fourteenth resistor R14 and to the main control chip through the fifteenth resistor R15. Its emitter is grounded. The fourteenth resistor R14 and the external power supply are grounded through the sixth capacitor C6, and the fifteenth resistor R15 and the main control chip are grounded through the seventh capacitor C7. The anode terminals of the eighth diodes D8 in the three phase sequence detection circuits are connected together.

[0051] When a phase voltage of the three-phase power supply is in the positive half-cycle, the corresponding voltage at the first terminal of the secondary winding turns the second optocoupler controller U3 forward through the thirteenth resistor R13, and the collector outputs a low-level signal to the main control chip. During the negative half-cycle, the second optocoupler controller U3 is cut off, and the collector is pulled up to a high level through the fourteenth resistor R14. The fifth capacitor C5 filters the input signal to eliminate high-frequency interference; the eighth diode D8 provides a discharge path for reverse voltage, protecting the second optocoupler controller U3; the sixth capacitor C6 and the seventh capacitor C7 filter the power supply and output signals respectively to ensure signal purity. The anodes of the eighth diodes D8 in the three sets of phase sequence detection circuits are connected to form a common ground structure, allowing the main control chip to determine the phase sequence of the three-phase power supply by comparing the timing relationship of the three signals. Through the above circuit structure, the main control chip can identify the phase sequence status in real time and adaptively adjust the triggering sequence of the thyristors, avoiding motor vibration or abnormal operation caused by incorrect phase sequence, and significantly improving the stability and reliability of the three-phase motor drive system.

[0052] Continue to refer to Figure 1 It is understandable that the first input terminal of each logic submodule is connected to the main control chip, and the first input terminal of the logic submodule is connected to the main control chip through the sixteenth resistor R16 to the external power supply. The pull-up resistor enhances the signal driving capability, improves anti-interference performance, ensures that the logic submodule reliably responds to the main control chip's commands, avoids thyristor false triggering caused by signal fluctuations, and improves circuit stability and reliability.

[0053] Secondly, this application also provides a circuit board including a thyristor detection and driving circuit as described in any embodiment of the first aspect. The technical solution of this circuit board is based on the thyristor detection and driving circuit provided above, and the technical problems it solves and the technical effects it produces are the same as those of the embodiments provided in the first aspect, and will not be repeated here.

[0054] Thirdly, this application also provides an electronic device, including a circuit board as described in the second aspect embodiment. The technical solution of this electronic device is based on the circuit board provided above, and the technical problems it solves and the technical effects it produces are the same as those in the second aspect embodiment, and will not be repeated here.

[0055] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.

Claims

1. A thyristor detection and driving circuit, characterized in that, It includes a main control chip, a logic control module, a start / stop circuit, a thyristor trigger circuit, a zero-crossing detection circuit, and a phase sequence detection circuit; the thyristor trigger circuit, the zero-crossing detection circuit, and the phase sequence detection circuit are each provided in three sets; The logic control module includes at least three logic sub-modules. Each logic sub-module is used to change the level state of its corresponding output terminal according to the level state of its first input terminal and second input terminal. The first input terminal of each logic sub-module is connected to the main control chip. The control terminal of the start-stop circuit is connected to the main control chip, and its signal terminal is connected to the second input terminal of the three logic sub-modules respectively. The control terminal of each group of the thyristor trigger circuits is connected to the output terminal of the corresponding logic submodule, and the output terminal of the thyristor trigger circuits is used to connect to the corresponding thyristor terminals. The acquisition terminals of each zero-crossing detection circuit and the phase sequence detection circuit are respectively connected to the first and second acquisition terminals of the corresponding thyristor trigger circuit, and the output terminals of the zero-crossing detection circuit and the phase sequence detection circuit are respectively connected to the main control chip. The main control chip is used to adjust the triggering timing of the trigger signal corresponding to the start / stop circuit according to the acquisition signal of the zero-crossing detection circuit, and to adjust the triggering order of each thyristor trigger circuit according to the acquisition signal of the phase sequence detection circuit.

2. The silicon controlled rectifier detection drive circuit of claim 1, wherein, The thyristor trigger circuit includes a high-frequency signal generation circuit, a transformer, and a first filter module. The input terminal of the high-frequency signal generation circuit is used to connect to an external power supply, its control terminal is connected to the output terminal of the corresponding logic submodule, and its output terminal is connected to the primary winding of the transformer. The primary winding and the secondary winding of the transformer are respectively connected to the corresponding thyristor terminals through the first filter module.

3. The silicon controlled rectifier detection drive circuit of claim 2, wherein, The high-frequency signal generating circuit includes a first capacitor, a first resistor, a second resistor, a first switching transistor, a first diode, and a second diode. The control terminal of the first switching transistor is connected to the output terminal of the corresponding logic submodule through the first resistor. The first resistor and the first switching transistor are grounded through the second resistor. The output terminal of the first switching transistor is grounded. The anode of the first diode is connected to an external power supply. The cathode of the first diode is connected to the cathode of the second diode. The anode of the second diode is connected to the input terminal of the first switching transistor. The two ends of the primary winding of the transformer are connected to the anodes of the first diode and the second diode, respectively. The anode of the first diode is also grounded through the first capacitor.

4. The thyristor detection and driving circuit according to claim 2, characterized in that, The first filtering module includes a third diode, a fourth diode, a fifth diode, a sixth diode, a third resistor, and a fourth resistor; The first end of the primary winding of the transformer is connected to the anode of the third diode and one end of the third resistor, respectively. Its second end is connected to the anode of the fourth diode. The cathode of the fourth diode is connected to the cathode of the third diode and the other end of the third resistor, respectively. The first end of the primary winding and the cathode of the fourth diode are connected to two control terminals of the corresponding thyristor terminals, respectively. The first end of the secondary winding of the transformer is connected to the anode of the fifth diode and one end of the fourth resistor, and its second end is connected to the anode of the sixth diode. The cathode of the sixth diode is connected to the cathode of the fifth diode and the other end of the fourth resistor. The first end of the secondary winding and the cathode of the sixth diode are connected to the other two control terminals of the corresponding thyristor terminals.

5. The thyristor detection and driving circuit according to claim 1, characterized in that, The start-stop circuit includes a second switching transistor, a fifth resistor, a sixth resistor, a seventh resistor, a seventh diode, and a second capacitor; The input terminal of the second switching transistor is connected to an external power supply through the fifth resistor, its output terminal is grounded, and it is connected to the control terminal through the sixth resistor. The anode of the seventh diode is connected to the output terminal of the second switching transistor, the cathode of the seventh diode is connected to the control terminal of the second switching transistor, and it is connected to the main control chip in sequence through the second capacitor and the seventh resistor. The signal terminal of the start / stop circuit is located between the fifth resistor and the input terminal of the second switching transistor.

6. The thyristor detection and driving circuit according to claim 4, characterized in that, The zero-crossing detection circuit includes an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a third capacitor, a fourth capacitor, a third switching transistor, and a first optocoupler controller. The positive terminal of the first optocoupler controller is connected to the first end of the corresponding second-stage winding, and its negative terminal is connected to the first end of the corresponding first-stage winding through the eighth resistor, and to the first end of the corresponding second-stage winding through the third capacitor and the ninth resistor, respectively. Its collector is connected to the input terminal of the third switching transistor, and to an external power supply through the tenth resistor and to the main control chip through the eleventh resistor, respectively. Its emitter is connected to the control terminal of the third switching transistor, and the eleventh resistor and the main control chip are grounded through the fourth capacitor. The output terminal of the third switching transistor is grounded and connected to its control terminal through the twelfth resistor.

7. The thyristor detection and driving circuit according to claim 4, characterized in that, The phase sequence detection circuit includes a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, an eighth diode, a fifth capacitor, a sixth capacitor, a seventh capacitor, and a second optocoupler controller. The positive terminal of the second optocoupler controller is connected to the first end of the corresponding second stage winding through the thirteenth resistor, to its negative terminal through the fifth capacitor, and to the cathode of the eighth diode. Its negative terminal is connected to the anode of the eighth diode. Its collector is connected to the external power supply through the fourteenth resistor and to the main control chip through the fifteenth resistor. Its emitter is grounded. The fourteenth resistor and the external power supply are grounded through the sixth capacitor, and the fifteenth resistor and the main control chip are grounded through the seventh capacitor. The anodes of the eighth diodes in the three sets of phase sequence detection circuits are connected.

8. The thyristor detection and driving circuit according to claim 1, characterized in that, The first input terminal of each logic submodule is connected to the main control chip, and the first input terminal of the logic submodule and the main control chip are connected to an external power supply through a sixteenth resistor.

9. A circuit board, characterized in that, Includes the thyristor detection drive circuit as described in any one of claims 1 to 8.

10. An electronic device, characterized in that, Includes the circuit board as described in claim 9.

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