Silicon controlled rectifier conduction angle confirmation device and method

Abstract

The application provides a silicon controlled rectifier conduction angle confirmation device and method. The device comprises a first rectifier bridge, a first resistor, a second resistor and an analog-to-digital converter, wherein: the first rectifier bridge comprises a first end, a second end, a third end and a fourth end, the second end and the third end are connected in parallel with the silicon controlled rectifier, the first end is connected with the fourth end, and a series branch of the first resistor and the second resistor is connected; the fourth end is grounded; the analog-to-digital converter is connected with the midpoint of the series connection of the first resistor and the second resistor, and is used for acquiring a first voltage and a second voltage of the silicon controlled rectifier conduction, and the first voltage and the second voltage are used for determining the conduction angle of the silicon controlled rectifier.

Description

Technical Field

[0001] This application relates to the field of thyristor control application technology, and more specifically, to a thyristor conduction angle confirmation device and method. Background Technology

[0002] With the rise of smart homes, the basic control logic for products controlled by SCRs, whether for dimming, temperature control, or speed adjustment, is to use the SCR chopper to regulate downstream devices. Taking SCR dimming as an example, more and more families are replacing their existing light bulbs with smart lights, and most households are installing SCR dimmers. However, it is difficult for smart light bulbs to dim together with SCR dimmers.

[0003] Therefore, additional adjustment circuits are often added directly to the subsequent stage of the SCR adjustment. However, when the subsequent stage is adjusted to low power or off state, the SCR dimmer will automatically turn off because the circuit current is less than the SCR's holding current. This results in the subsequent stage being unable to accurately detect the SCR's conduction angle or the zero-crossing point of the AC current.

[0004] To ensure that the thyristor does not turn off before the desired turn-off point (such as the AC zero-crossing point) due to low current in the subsequent low-power or shutdown state, the conventional approach is to add a circuit to provide a sustaining current to the thyristor when the current in the subsequent circuit is insufficient, ensuring that the thyristor turns on normally, thereby obtaining accurate signals such as the thyristor conduction angle.

[0005] However, this approach requires an external current to provide the sustaining current, which reduces the efficiency of the thyristor system, increases standby power consumption, and increases circuit costs.

[0006] The information disclosed in the background section is only intended to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0007] To address the aforementioned issues, this application proposes a thyristor conduction angle confirmation device and method. The thyristor conduction angle is determined by sampling using an analog-to-digital converter. The circuit is simple, requires no sustaining current circuit, and reduces standby power consumption and cost of thyristor-compatible devices.

[0008] According to a first aspect of this application, a thyristor conduction angle confirmation device is provided, the device comprising a first rectifier bridge, a first resistor, a second resistor, and an analog-to-digital converter, wherein:

[0009] The first rectifier bridge includes a first terminal, a second terminal, a third terminal, and a fourth terminal. The second terminal and the third terminal are connected in parallel with the thyristor. The first terminal and the fourth terminal are connected to a series branch of the first resistor and the second resistor. The fourth terminal is grounded.

[0010] The analog-to-digital converter is connected to the midpoint of the series connection of the first resistor and the second resistor, and is used to obtain the first voltage and the second voltage at which the thyristor is turned on. The first voltage and the second voltage are used to determine the conduction angle of the thyristor.

[0011] According to some embodiments, the device further includes a level transition detection unit, which includes a third resistor, a fourth resistor, a first capacitor, and a first MOSFET, wherein:

[0012] One end of the third resistor is connected to the source of the first MOS transistor, and the other end is connected to one end of the fourth resistor, with the other end of the fourth resistor grounded.

[0013] The midpoint of the series connection between the third resistor and the fourth resistor is the input / output port;

[0014] One end of the first capacitor is connected to the gate of the first MOSFET, and the other end is grounded;

[0015] The gate of the first MOSFET is connected to the power supply, and the drain is connected to the first terminal of the first rectifier bridge.

[0016] According to some embodiments, the device further includes a level transition detection unit, which includes a sixth resistor, a seventh resistor, and a first diode, wherein:

[0017] The sixth resistor and the seventh resistor are connected in series and then connected in parallel with the first terminal and the fourth terminal of the first rectifier bridge; the midpoint of the series connection between the sixth resistor and the seventh resistor is the input / output port;

[0018] The cathode of the first diode is connected to the input / output port, and the anode is grounded.

[0019] According to some embodiments, the input / output port of the level transition detection unit acquires the level transition status, and when the level transition is acquired at the input / output port, the analog-to-digital converter acquires the first voltage.

[0020] According to some embodiments, the analog-to-digital converter continuously acquires the input voltage, and if the input voltage is higher than a first threshold, it confirms that the input voltage at this time is the first voltage.

[0021] According to some embodiments, after acquiring the first voltage, the analog-to-digital converter delays for a first time before acquiring the second voltage.

[0022] According to a second aspect of this application, a method for confirming the conduction angle of a thyristor is provided, for use in a thyristor conduction angle confirmation device as described in any of the first aspects, the method comprising:

[0023] Obtain the first voltage at which the thyristor is turned on;

[0024] After a first delay, the second voltage at which the thyristor is turned on is obtained;

[0025] The conduction angle of the thyristor is determined based on the first voltage and the second voltage.

[0026] According to some embodiments, obtaining the first voltage at which the thyristor is turned on includes:

[0027] The input voltage is continuously acquired by the analog-to-digital converter, and the first voltage is confirmed when the input voltage is higher than a first threshold.

[0028] According to some embodiments, the device further includes a level transition detection unit, wherein obtaining the first voltage at which the thyristor is turned on includes:

[0029] When the level transition detection unit detects a level transition, it acquires the first voltage.

[0030] According to some embodiments, determining the conduction angle of the thyristor based on the first voltage and the second voltage includes:

[0031] The formula for calculating the conduction angle is determined based on the first voltage, the second voltage, and the first time.

[0032] The conduction angle of the first voltage of the thyristor is determined according to the conduction angle calculation formula.

[0033] This application proposes a thyristor conduction angle confirmation device and method, which determines the thyristor conduction angle through ADC sampling. The circuit is simple, does not require a holding current circuit, and can reduce the standby power consumption and cost of devices compatible with thyristor controllers.

[0034] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0035] The above and other objects, features, and advantages of this application will become more apparent from the detailed description of exemplary embodiments with reference to the accompanying drawings. The drawings described below are merely some embodiments of this application and are not intended to limit the scope of this application.

[0036] Figure 1 A schematic diagram of an exemplary mains power sine wave is shown;

[0037] Figure 2 A schematic diagram of an exemplary power supply voltage waveform after phase cutting of a normal thyristor is shown.

[0038] Figure 3 A schematic diagram of the power supply voltage waveform of the subsequent stage after an exemplary thyristor is turned off before reaching zero crossing is shown.

[0039] Figure 4 A schematic diagram of a thyristor conduction angle confirmation device is shown as an exemplary embodiment;

[0040] Figure 5 Another embodiment of an exemplary silicon controlled rectifier (SCR) conduction angle confirmation device is shown;

[0041] Figure 6 Another embodiment of an exemplary silicon controlled rectifier (SCR) conduction angle confirmation device is shown;

[0042] Figure 7 A flowchart illustrating an exemplary embodiment of a method for confirming the conduction angle of a silicon controlled rectifier (SCR) is shown. Detailed Implementation

[0043] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this application will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted.

[0044] The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a full understanding of embodiments of this disclosure. However, those skilled in the art will recognize that the technical solutions of this disclosure can be practiced without one or more of these specific details, or other methods, components, materials, devices, etc. In these cases, well-known structures, methods, devices, implementations, materials, or operations will not be shown or described in detail.

[0045] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0046] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0047] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of exemplary embodiments, and the modules or processes in the drawings are not necessarily essential for implementing this application, and therefore cannot be used to limit the scope of protection of this application.

[0048] Figure 1 A schematic diagram of an exemplary mains power sine wave is shown.

[0049] Figure 1 The waveform of the mains power sine wave is shown. Figure 2 The waveform of the power supply voltage after the phase cut of a normal thyristor is shown.

[0050] According to some embodiments, the power of the downstream load can be adjusted by regulating the conduction angle of the thyristor. Under normal circumstances, the load provides sufficient sustaining current to the thyristor after it turns on, allowing it to remain on until it reaches zero-crossing voltage (or near the zero-crossing point) and then turns off. However, if other power regulation circuits are added to the downstream stage, the thyristor may turn off due to insufficient sustaining current before reaching the zero-crossing point. Figure 3 As shown, this state is usually not a stable turn-off point due to the load of the downstream stage. In this case, it is impossible to accurately calculate the conduction angle by using the time difference between the zero-crossing point and the thyristor conduction angle. It is necessary to add a circuit to provide a sustaining current for the thyristor conduction to keep the waveform of the downstream supply voltage stable. Figure 2 The shape must be known for proper detection of the conduction angle of the thyristor.

[0051] Figure 4 A schematic diagram of a thyristor conduction angle confirmation device is shown as an exemplary embodiment.

[0052] like Figure 4As shown, the thyristor conduction angle confirmation device includes a first rectifier bridge DB1, a first resistor R1, a second resistor R2, and an analog-to-digital converter (ADC). The first rectifier bridge DB1 includes a first terminal 1, a second terminal 2, a third terminal 3, and a fourth terminal 4. The second terminal 2 and the third terminal 3 are connected in parallel with the thyristor controller 401. The first terminal 1 and the fourth terminal 4 are connected to the series branch of the first resistor R1 and the second resistor R2, and the fourth terminal 4 is grounded. The ADC is connected to the midpoint of the series connection of the first resistor R1 and the second resistor R2, and is used to obtain the first voltage U1 and the second voltage U2 of the thyristor controller. The first voltage U1 and the second voltage U2 are used to determine the conduction angle of the thyristor controller.

[0053] According to some embodiments, the thyristor conduction angle confirmation device further includes a fuse F1 connected in series between the thyristor controller 401 and the second terminal 2 of the first rectifier bridge DB1.

[0054] According to the example embodiment, the analog-to-digital converter (ADC) continuously acquires the input voltage. If the input voltage is higher than a first threshold, it confirms that the current input voltage is a first voltage U1. After acquiring the first voltage U1, the ADC delays for a first time t and then acquires the second voltage U2.

[0055] According to some embodiments, the first time t≤Δt, where Δt is the time from the turn-on of the thyristor controller to the cut-off point.

[0056] According to the example embodiment, the conduction angle of the thyristor controller can be determined by substituting the first voltage U1, the second voltage U2, and the first time t into the mains sine wave equation.

[0057] According to some embodiments, the conduction angle of the thyristor controller can also be determined by using a lookup table method based on a pre-stored relationship between voltage and phase angle.

[0058] This application provides a thyristor conduction angle confirmation device, which determines the thyristor conduction angle through ADC sampling. The circuit is simple, does not require a holding current circuit, and can reduce the standby power consumption and cost of devices compatible with thyristor controllers.

[0059] Figure 5 This diagram illustrates yet another embodiment of an exemplary silicon controlled rectifier (SCR) conduction angle confirmation device.

[0060] like Figure 5As shown, the thyristor conduction angle confirmation device includes a first rectifier bridge DB1, a first resistor R1, a second resistor R2, an analog-to-digital converter (ADC), and a level transition detection unit 403. The first rectifier bridge DB1 includes a first terminal 1, a second terminal 2, a third terminal 3, and a fourth terminal 4. The second terminal 2 and the third terminal 3 are connected in parallel with the thyristor controller 401. The first terminal 1 and the fourth terminal 4 are connected to the series branch of the first resistor R1 and the second resistor R2, and the fourth terminal 4 is grounded. The analog-to-digital converter (ADC) is connected to the midpoint of the series connection of the first resistor R1 and the second resistor R2, and is used to obtain the first voltage U1 and the second voltage U2 of the thyristor controller. The first voltage U1 and the second voltage U2 are used to determine the conduction angle of the thyristor controller.

[0061] According to the example embodiment, the level transition detection unit 403 includes a third resistor R3, a fourth resistor R4, a first capacitor C1, and a first MOSFET Q1, wherein: one end of the third resistor R3 is connected to the source of the first MOSFET Q1, and the other end is connected to one end of the fourth resistor R4, and the other end of the fourth resistor R4 is grounded; the midpoint of the series connection of the third resistor R3 and the fourth resistor R4 is the input / output port I / O; one end of the first capacitor C1 is connected to the gate of the first MOSFET Q1, and the other end is grounded; the gate of the first MOSFET Q1 is connected to the power supply VDD, and the drain is connected to the first terminal I of the first rectifier bridge DB1.

[0062] According to some embodiments, the thyristor conduction angle confirmation device further includes a fuse F1 connected in series between the thyristor controller 401 and the second terminal 2 of the first rectifier bridge DB1.

[0063] According to the example embodiment, the level transition detection unit 403 acquires the level transition status at its input / output port (I / O). When a level transition is detected at the input / output port (I / O), the analog-to-digital converter (ADC) starts sampling to obtain a first voltage U1. After acquiring the first voltage U1, the ADC delays for a first time t to acquire a second voltage U2.

[0064] According to some embodiments, the first time t≤Δt, where Δt is the time from the turn-on of the thyristor controller to the cut-off point.

[0065] According to the example embodiment, the conduction angle of the thyristor controller can be determined by substituting the first voltage U1, the second voltage U2, and the first time t into the mains sine wave equation.

[0066] According to some embodiments, the conduction angle of the thyristor controller can also be determined by using a lookup table method based on a pre-stored relationship between voltage and phase angle.

[0067] According to some embodiments, the level transition detection unit 403 further includes a fifth resistor R5, one end of which is connected to the source of the first MOS transistor Q1, and the other end is connected to the enable terminal EN, so as to realize the control of the downstream device by the thyristor controller and prevent the downstream device from working abnormally when the thyristor is turned off.

[0068] This application provides a thyristor conduction angle confirmation device, which determines the thyristor conduction angle through ADC sampling and reduces device power consumption through MOSFETs. The circuit is simple, requiring no holding current circuit, which can reduce the standby power consumption and cost of devices compatible with thyristor controllers. By adding a level transition detection unit, the resource occupation of the controller by ADC sampling is reduced. It is possible to determine the thyristor conduction phase by only collecting the mains voltage U1 when the thyristor is conducting and the voltage value U2 after a certain time (at or before the cutoff point).

[0069] Figure 6 This diagram illustrates yet another embodiment of an exemplary silicon controlled rectifier (SCR) conduction angle confirmation device.

[0070] like Figure 6 As shown, the thyristor conduction angle confirmation device includes a first rectifier bridge DB1, a first resistor R1, a second resistor R2, an analog-to-digital converter (ADC), and a level transition detection unit 403. The first rectifier bridge DB1 includes a first terminal 1, a second terminal 2, a third terminal 3, and a fourth terminal 4. The second terminal 2 and the third terminal 3 are connected in parallel with the thyristor controller 401. The first terminal 1 and the fourth terminal 4 are connected to the series branch of the first resistor R1 and the second resistor R2, and the fourth terminal 4 is grounded. The analog-to-digital converter (ADC) is connected to the midpoint of the series connection of the first resistor R1 and the second resistor R2, and is used to obtain the first voltage U1 and the second voltage U2 of the thyristor controller. The first voltage U1 and the second voltage U2 are used to determine the conduction angle of the thyristor controller.

[0071] According to the example embodiment, the level transition detection unit 403 includes a third resistor R3, a fourth resistor R4, and a first diode D1, wherein: the third resistor R3 and the fourth resistor R4 are connected in series and then connected in parallel with the first terminal 1 and the fourth terminal 4 of the first rectifier bridge DB1; the midpoint of the series connection of the third resistor R3 and the fourth resistor R4 is the input / output port I / O; the cathode of the first diode D1 is connected to the input / output port I / O, and the anode is grounded.

[0072] According to the example embodiment, the level transition detection unit 403 acquires the level transition status at its input / output port (I / O). When a level transition is detected at the input / output port (I / O), the analog-to-digital converter (ADC) starts sampling to obtain a first voltage U1. After acquiring the first voltage U1, the ADC delays for a first time t to acquire a second voltage U2.

[0073] According to some embodiments, the first time t≤Δt, where Δt is the time from the turn-on of the thyristor controller to the cut-off point.

[0074] According to the example embodiment, the conduction angle of the thyristor controller can be determined by substituting the first voltage U1, the second voltage U2, and the first time t into the mains sine wave equation.

[0075] According to some embodiments, the conduction angle of the thyristor controller can also be determined by using a lookup table method based on a pre-stored relationship between voltage and phase angle.

[0076] According to some embodiments, the level transition detection unit 403 further includes a fifth resistor R5, one end of which is connected to the source of the first MOS transistor Q1, and the other end is connected to the enable terminal EN, so as to realize the control of the downstream device by the thyristor controller and prevent the downstream device from working abnormally when the thyristor is turned off.

[0077] This application provides a thyristor conduction angle confirmation device, which determines the thyristor conduction angle through ADC sampling and reduces equipment cost by using diodes. The circuit is simple, requiring no holding current circuit, which can reduce the standby power consumption and cost of devices compatible with thyristor controllers. By adding a level transition detection unit, the resource occupation of the controller by ADC sampling is reduced. It is possible to determine the thyristor conduction phase by only collecting the mains voltage U1 when the thyristor is conducting and the voltage value U2 after a certain time (at or before the cutoff point).

[0078] Figure 7 A flowchart illustrating an exemplary embodiment of a method for confirming the conduction angle of a silicon controlled rectifier (SCR) is shown.

[0079] S701 obtains the first voltage at which the thyristor turns on.

[0080] According to the example embodiment, the analog-to-digital converter (ADC) continuously acquires the input voltage. If the input voltage is higher than a first threshold, it is confirmed that the current input voltage is the first voltage U1. Alternatively, if the level transition detection unit detects a level transition, the ADC starts sampling to obtain the first voltage U1.

[0081] S702 delays the first moment to obtain the second voltage at which the thyristor turns on.

[0082] According to the example embodiment, after acquiring the first voltage U1, the analog-to-digital converter (ADC) delays for a first time t to acquire the second voltage U2.

[0083] According to some embodiments, the first time t≤Δt, where Δt is the time from the turn-on of the thyristor controller to the cut-off point.

[0084] S703 determines the conduction angle of the thyristor based on the first voltage and the second voltage.

[0085] According to the example embodiment, a first phase angle is determined based on a first voltage U1; a second phase angle is determined based on a second voltage U2; and the conduction angle of the thyristor is confirmed based on the first phase angle and the second phase angle.

[0086] According to some embodiments, the first voltage U1, the second voltage U2, and the first time t are substituted into the calculation formula to determine the conduction angle. This application uses the mains power sine wave equation. Taking the determination of the conduction angle of the thyristor controller as an example, we obtain x, A, k, and φ. k and φ can be simplified to obtain a linear equation in two variables x and A. The conduction angle of the thyristor controller at this time can be determined based on the first voltage U1, that is, the conduction time x of the first voltage U1 can be determined. Here, y is the input voltage continuously acquired by the analog-to-digital converter (ADC), x is the conduction time, A is the amplitude, φ is the phase offset, ω is the angular velocity, which can be obtained by measuring the detection pulse frequency, and k is the offset.

[0087]

[0088] According to some embodiments, the conduction angle of the thyristor at the first voltage U1 can also be determined using a lookup table method based on the pre-stored relationship between voltage and phase angle, according to the first voltage U1, the second voltage U2, and the first time t. The lookup table method involves dividing the difference between the first voltage U1 and the second voltage U2 by the first time t to obtain the corresponding slope; then, by finding the corresponding approximate solution in the table based on the slope and the first time t, the conduction angle of the thyristor can be determined.

[0089] This application proposes a method for confirming the conduction angle of a thyristor. By using ADC sampling, only the mains voltage U1 when the thyristor is turned on is collected, and the voltage value U2 after a certain time (at or before the cutoff point) is collected to determine the conduction angle of the thyristor at the mains voltage U1.

[0090] It should be clearly understood that this application describes how specific examples are formed and used, but this application is not limited to any details of these examples. Rather, based on the teachings of the disclosure of this application, these principles can be applied to many other embodiments.

[0091] Furthermore, it should be noted that the above figures are merely illustrative representations of the processes included in the method according to exemplary embodiments of this application, and are not intended to be limiting. It is readily understood that the processes shown in the above figures do not indicate or limit the temporal order of these processes. Additionally, it is readily understood that these processes may be executed synchronously or asynchronously, for example, in multiple modules.

[0092] Exemplary embodiments of this application have been specifically shown and described above. It should be understood that this application is not limited to the detailed structures, arrangements, or implementation methods described herein; rather, this application is intended to cover various modifications and equivalent arrangements contained within the spirit and scope of the appended claims.

Claims

1. A thyristor conduction angle confirmation device, characterized in that, The device includes a first rectifier bridge, a first resistor, a second resistor, and an analog-to-digital converter, wherein: The first rectifier bridge includes a first terminal, a second terminal, a third terminal, and a fourth terminal. The second terminal and the third terminal are connected in parallel with the thyristor. The first terminal and the fourth terminal are connected to a series branch of the first resistor and the second resistor. The fourth terminal is grounded. The analog-to-digital converter is connected to the midpoint of the series connection of the first resistor and the second resistor, and is used to obtain the first voltage and the second voltage at which the thyristor is turned on. The first voltage and the second voltage are used to determine the conduction angle of the thyristor. The device further includes: a level transition detection unit, which comprises a third resistor, a fourth resistor, a first capacitor, and a first MOSFET, wherein: One end of the third resistor is connected to the source of the first MOS transistor, and the other end is connected to one end of the fourth resistor, with the other end of the fourth resistor grounded. The midpoint of the series connection between the third resistor and the fourth resistor is the input / output port; One end of the first capacitor is connected to the gate of the first MOSFET, and the other end is grounded; The gate of the first MOSFET is connected to the power supply, and the drain is connected to the first terminal of the first rectifier bridge.

2. The thyristor conduction angle confirmation device as described in claim 1, characterized in that, The device further includes a level transition detection unit, which comprises a sixth resistor, a seventh resistor, and a first diode, wherein: The sixth resistor and the seventh resistor are connected in series and then connected in parallel with the first terminal and the fourth terminal of the first rectifier bridge; the midpoint of the series connection between the sixth resistor and the seventh resistor is the input / output port; The cathode of the first diode is connected to the input / output port, and the anode is grounded.

3. The thyristor conduction angle confirmation device as described in claim 1 or 2, characterized in that, The input / output port of the level transition detection unit acquires the level transition status, and when the level transition is acquired at the input / output port, the analog-to-digital converter acquires the first voltage.

4. The thyristor conduction angle confirmation device as described in claim 1, characterized in that, The analog-to-digital converter continuously acquires the input voltage, and if the input voltage is higher than a first threshold, it confirms that the input voltage at this time is the first voltage.

5. The thyristor conduction angle confirmation device as described in any one of claims 1-2, characterized in that, After acquiring the first voltage, the analog-to-digital converter delays for a first time before acquiring the second voltage.

6. A method for confirming the conduction angle of a thyristor, characterized in that, The method for confirming the conduction angle of a thyristor as described in any one of claims 1-5 includes: Obtain the first voltage at which the thyristor is turned on; After a first delay, the second voltage at which the thyristor is turned on is obtained; The conduction angle of the thyristor is determined based on the first voltage and the second voltage.

7. The method for confirming the conduction angle of a thyristor as described in claim 6, characterized in that, The first voltage for obtaining the turn-on voltage of the thyristor includes: The input voltage is continuously acquired by the analog-to-digital converter, and the first voltage is confirmed when the input voltage is higher than a first threshold.

8. The method for confirming the conduction angle of a thyristor as described in claim 6, characterized in that, The device further includes a level transition detection unit, wherein obtaining the first voltage at which the thyristor is turned on includes: When the level transition detection unit detects a level transition, it acquires the first voltage.

9. The method for confirming the conduction angle of a thyristor as described in any one of claims 6-8, characterized in that, Determining the conduction angle of the thyristor based on the first voltage and the second voltage includes: The formula for calculating the conduction angle is determined based on the first voltage, the second voltage, and the first time. The conduction angle of the first voltage of the thyristor is determined according to the conduction angle calculation formula.

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