JP7386778B2 - Control device, control method, and program - Google Patents

Description

The present invention relates to a control device, a control method, and a program.

Conventionally, semiconductor elements for power control such as thyristors have been widely used in various devices. For example, Patent Document 1 discloses a power conversion device that includes a thyristor and a control unit that receives power supply voltage from a power supply circuit and controls on/off of the thyristor. In the power conversion device, the control unit turns on the thyristor by supplying an ignition signal to the thyristor when the detected value of the input voltage exceeds a predetermined threshold voltage.

International Publication No. 2016/203517

However, when detecting the input voltage using a control unit such as a microcomputer, the operating cycle of the software in the control unit becomes the limit of the sampling cycle, but this is not fast enough and the sampling value at that sampling cycle cannot be directly used as the threshold value. When used for comparison, the error in ignition control of the power semiconductor device becomes large.

Therefore, an object of the present invention is to provide a control device, a control method, and a program that can improve the accuracy of ignition control of a power semiconductor element.

A control device according to one aspect of the present invention includes: an A/D conversion processing unit that generates a first digital signal by sampling an AC signal in a first period; and a first digital signal generated by the A/D conversion processing unit. an interpolation processing section that generates a second digital signal by interpolating the signal at a second period higher than the first period; and a comparison of the second digital signal generated by the interpolation processing section with a predetermined threshold. a second time calculation processing section that calculates a second time at which the second digital signal exceeds a predetermined threshold; and ignition of a power semiconductor element based on the second time calculated by the second time calculation processing section. and an ignition control processing section that generates an ignition signal for.

According to this aspect, the first digital signal is interpolated by a second cycle higher than the first cycle of sampling for generating the first digital signal, and then the second digital signal generated by the interpolation process is A second time at which the threshold is greater than or equal to the threshold is calculated. Therefore, a second time closer to the true timing at which the AC signal becomes equal to or greater than the predetermined threshold can be obtained than when comparing the first digital signal with the threshold. Since a firing signal for firing the power semiconductor element is generated based on the second time, it is possible to improve the accuracy of firing control of the power semiconductor element.

In the above aspect, the ignition control processing section includes a first time calculation processing section that calculates a first time at which the first digital signal exceeds a predetermined threshold by comparing the first digital signal with a predetermined threshold; a firing angle value correction unit that calculates an offset value that is the difference between the second time and the first time and corrects the firing angle value by subtracting the offset value from a predetermined firing angle value; The engine may include a counter unit that counts, and a firing signal generation unit that generates a firing signal when the count value output by the counter unit is equal to or greater than the corrected firing angle value.

According to this aspect, it is possible to improve the accuracy of ignition control of the power semiconductor element without using a high-performance A/D converter, processor, or the like.

In the above aspect, the counter section may be configured by a hardware counter.

According to this aspect, it is possible to improve the accuracy of ignition control of the power semiconductor element without using a high-performance A/D converter, processor, or the like.

In the above aspect, the power semiconductor device may include at least one of a unidirectional thyristor, a GTO thyristor, and a triac.

According to this aspect, it is possible to improve the accuracy of ignition control of various power semiconductor devices.

A control method according to one aspect of the present invention includes an A/D conversion processing step of generating a first digital signal by sampling an AC signal in a first period, and a first digital signal generated by the A/D conversion processing step. an interpolation processing step of generating a second digital signal by interpolating the signal with a second period higher than the first period; and comparing the second digital signal generated by the interpolation processing step with a predetermined threshold. a second time calculation step of calculating a second time at which the second digital signal exceeds a predetermined threshold; and ignition of the power semiconductor element based on the second time calculated by the second time calculation processing step. and a firing control processing step for generating a firing signal.

According to this aspect, the first digital signal is interpolated by a second cycle higher than the first cycle of sampling for generating the first digital signal, and then the second digital signal generated by the interpolation process is A second time at which the threshold is greater than or equal to the threshold is calculated. Therefore, a second time closer to the true timing at which the AC signal becomes equal to or greater than the predetermined threshold can be obtained than when comparing the first digital signal with the threshold. Since a firing signal for firing the power semiconductor element is generated based on the second time, it is possible to improve the accuracy of firing control of the power semiconductor element.

A program according to one aspect of the present invention is a program for causing an information processing device to control ignition of a power semiconductor element, and the program causes the information processing device to perform a first digital signal by sampling an alternating current signal in a first cycle. An A/D conversion processing unit that generates a signal; and interpolation that generates a second digital signal by interpolating the first digital signal generated by the A/D conversion processing unit in a second period higher than the first period. a second time calculation processing unit that calculates a second time at which the second digital signal exceeds a predetermined threshold by comparing the second digital signal generated by the processing unit and the interpolation processing unit with a predetermined threshold; It functions as a firing control processing section that generates a firing signal for firing a power semiconductor element based on the second time calculated by the second time calculation processing section.

According to this aspect, the first digital signal is interpolated by a second cycle higher than the first cycle of sampling for generating the first digital signal, and then the second digital signal generated by the interpolation process is A second time at which the threshold is greater than or equal to the threshold is calculated. Therefore, a second time closer to the true timing at which the AC signal becomes equal to or greater than the predetermined threshold can be obtained than when comparing the first digital signal with the threshold. Since a firing signal for firing the power semiconductor element is generated based on the second time, it is possible to improve the accuracy of firing control of the power semiconductor element.

According to the present invention, it is possible to provide a control device, a control method, and a program that can improve the accuracy of ignition control of a power semiconductor element.

FIG. 2 is a block diagram of an electrical system of the device 1 according to the embodiment. 3 is a diagram showing an example of a schematic timing chart for explaining the operation of the device 1. FIG. 3 is an enlarged diagram of the vicinity of zero cross Zc of the voltage waveform of the AC signal in FIG. 2. FIG. FIG. 4 is a diagram illustrating an example of the operational flow of the first digital signal generation process by the A/D conversion processing section 11. 7 is a diagram illustrating an example of an operation flow of a first time calculation process by a first time calculation unit 151. FIG. 3 is a diagram illustrating an example of an operation flow of second digital signal generation processing by the interpolation processing unit 12. FIG. 7 is a diagram illustrating an example of an operation flow of second time calculation processing by the second time calculation unit 13. FIG. 7 is a diagram illustrating an example of an operation flow of a firing angle value correction process by a firing angle value correction unit 152. FIG. 5 is a diagram illustrating an example of an operation flow of ignition signal generation processing by an ignition signal generation unit 154. FIG.

Preferred embodiments of the present invention will be described with reference to the accompanying drawings. (In each figure, items with the same reference numerals have the same or similar configurations.)

(1) Configuration FIG. 1 is a block diagram of the electrical system of the device 1 according to the embodiment. The device 1 is not particularly limited, but may be, for example, an electrostatic precipitator installed in various industrial plants. The device 1 includes a load L electrically connected to an alternating current power supply AC, a thyristor 2 electrically connected in series to the load L, a processor 10, and level converters 30 and 40.

The alternating current power source AC may be, for example, a commercial alternating current power source that supplies an alternating current signal at a predetermined frequency (for example, about 50 Hz or 60 Hz). The load L is not particularly limited, but may be, for example, a discharge electrode system or a dust collection electrode system included in an electrostatic precipitator.

The thyristor 2 is, for example, a bidirectional thyristor (TRIAC), and its firing is controlled by a firing signal supplied from the processor 10. Note that the device 1 is not limited to the thyristor 2, and may include power semiconductor elements such as a (unidirectional) thyristor and a GTO thyristor.

The level converter 30 is configured by, for example, a transformer or a resistive voltage divider circuit. The level converter 30 receives an AC signal from the AC power source AC. The level converter 30 appropriately steps down the input AC signal and outputs it to the A/D conversion processor 11 .

The level converter 40 is configured as a signal amplification circuit using a transformer, a transistor, or the like, for example. A firing signal for firing the thyristor 2 is inputted to the level conversion unit 40 from the firing signal generation unit 154 . The level converter 40 amplifies the input firing signal to a level suitable for gate control of the thyristor, and outputs the amplified signal to the gate of the thyristor 2. When the ignition signal is input from the level converter 40 to the gate of the thyristor 2 in a state where the absolute value of the alternating current signal of the alternating current power supply AC is greater than or equal to a predetermined threshold value, the thyristor 2 is ignited (turned on). The thyristor 2 is turned off when the alternating current signal of the alternating current power source AC becomes reverse biased.

The processor 10 uses codes or instructions included in programs stored in a memory (RAM (Random Access Memory), ROM (Read Only Memory), HDD (Hard Disc Drive), SSD (Solid State Drive), etc.) (not shown). Execute a process, function, or method to achieve it. Processor 10 may include, by way of example and not limitation, a central processing unit (CPU), an MPU (Micro Processing Unit), a GPU (Graphics Processing Unit), a microprocessor, a processor core, a multiprocessor, Logic circuits (hardware) formed in integrated circuits (IC (Integrated Circuit) chips, LSI (Large Scale Integration)), etc., including ASIC (Application-Specific Integrated Circuit), FPGA (Field Programmable Gate Array), etc. Each process, function, or method disclosed in each embodiment may be implemented by a circuit. Further, these circuits may be realized by one or more integrated circuits, and a plurality of processes shown in each embodiment may be realized by one integrated circuit. Furthermore, LSIs are sometimes called VLSIs, super LSIs, ultra LSIs, etc. depending on the degree of integration.

The processor 10 controls the firing of the thyristor 2 starting from the timing when the AC signal becomes equal to or higher than a predetermined threshold value. Note that although the predetermined threshold will be described below using an example of timing when the voltage is zero (zero crossing), the predetermined threshold is not limited to zero crossing, but may be any value. The processor 10 includes, for example, an analog/digital (A/D) conversion processing section 11, an interpolation processing section 12, a second time calculation section 13, a feedback calculation section 14, and an ignition control processing section 15. At least some or all of these functional modules included in the processor 10 may be realized as a processor and software, or may be realized as hardware, for example. The processor 10 is connected to an alternating current power source AC, and detects an alternating current signal supplied by the alternating current power source AC. The processor 10 then fires the thyristor 2 based on the detected AC signal.

The A/D conversion processing section 11 generates a first digital signal by sampling the AC signal input from the level conversion section 30 at a predetermined first period. Then, the A/D conversion processing section 11 outputs the generated first digital signal to the interpolation processing section 12 and a first time calculation section 151, which will be described later. Here, the first period in which the A/D conversion processing unit 11 performs sampling may be, for example, a value set in advance in software as a period in which sampling is performed. The first period may be, for example, about 10 kHz, although it is not particularly limited.

The interpolation processing unit 12 generates a second digital signal by interpolating the first digital signal input from the A/D conversion processing unit 11 at a second period higher than the first period, and outputs the second digital signal at a second time. It is output to the calculation unit 13. Here, the second cycle may be, for example, a value corresponding to the clock cycle of the processor on which the processor 10 is installed. The height of the second period is not particularly limited, but may be, for example, about 10 MHz. In particular, the second period may be an integral multiple of the first period. In addition, the interpolation process executed by the interpolation processing unit 12 is performed by, for example, connecting two temporally consecutive points in the first digital signal with a straight line (first-order approximate straight line), and plotting the line on the straight line at intervals corresponding to the second cycle. By doing so, the points forming the second digital signal may be obtained.

The second time calculation unit 13 calculates a second time, which is the timing of zero crossing in the second digital signal, based on the second digital signal input from the interpolation processing unit 12. For example, if the first signal is less than zero and the second signal is greater than or equal to zero among two temporally consecutive signals in the second digital signal, the second time calculation unit 13 calculates the Calculate the time as the second time.

The feedback calculation unit 14 calculates a firing angle value, which is a firing angle value that defines the timing at which the thyristor 2 is fired, by a predetermined feedback calculation. Here, the predetermined feedback calculation can be arbitrarily set according to the configuration of the device 1 and the load L, and is executed based on any sensor (voltage sensor, current sensor, etc.) arranged in the device 1. . The feedback calculation unit 14 supplies information indicating the calculated firing angle value to the firing angle value correction unit 152 of the firing control processing unit 15.

The ignition control processing section 15 generates an ignition signal for igniting the power semiconductor element based on the first digital signal and the second time calculated by the second time calculation section 13. The firing control processing section 15 includes a first time calculation section 151, a firing angle value correction section 152, a counter section 153, and a firing signal generation section 154.

The first time calculation unit 151 calculates a first time, which is the timing of zero cross in the first digital signal, based on the first digital signal input from the A/D conversion processing unit 11. For example, when the first signal is less than zero and the second signal is greater than or equal to zero among two temporally consecutive signals in the first digital signal, the first time calculation unit 151 calculates the value of the second signal. Calculate the time as the first time. The first time calculation section 151 outputs the calculated first time to the firing angle value correction section 152 and the counter section 153.

The firing angle value correction unit 152 calculates the firing angle value calculated by the feedback calculation unit 14 based on the first time calculated by the first time calculation unit 151 and the second time calculated by the second time calculation unit 13. Correct the firing angle value. Specifically, the firing angle value correction unit 152 calculates the difference between the first time and the second time as an offset value at a predetermined timing, and then calculates the difference from the firing angle value obtained from the feedback calculation unit 14. The firing angle value is corrected by subtracting the offset value described above. In other words, the corrected firing angle value is a firing angle that defines the timing to fire starting from the first time with a relatively large error. The firing angle value correction section 152 supplies the corrected firing angle value to the firing signal generation section 154.

The counter unit 153 may be, for example, a hardware counter built into the processor as a dedicated circuit. The counter unit 153 counts the clock in the processor at a second cycle (for example, 10 MHz). Further, the count value by the counter section 153 is reset each time the first time, which is the timing of zero crossing in the first digital signal, is input from the first time calculation section 151. Then, the counter section 153 sequentially outputs the counted value (count value) to the ignition signal generation section 154 in a second period.

The ignition signal generation section 154 includes, for example, a comparator and a pulse generator (not shown). The ignition signal generation section 154 receives a count value from the counter section 153 at a predetermined timing. Here, the predetermined timing may be, for example, the same as the second period, which is the interval between signal values of the second digital signal. The firing signal generation unit 154 refers to the corrected firing angle value supplied from the firing angle value correction unit 152 every time the count value is input from the counter unit 153 in the second period, and calculates the count value. and the corresponding firing angle value. The firing signal generating section 154 generates a firing signal for instructing firing of the thyristor 2 when the count value becomes equal to or greater than the firing angle value, and outputs this to the level converting section 40 .

(2) Operation Next, the operation of the device 1 will be explained with reference to FIGS. 2 to 9 as appropriate. In particular, FIG. 2 is a diagram showing an example of a schematic timing chart for explaining the operation of the device 1. The top row shows the voltage waveform of the AC signal. The middle row shows the firing signal for firing the thyristor 2. The bottom row shows the on/off state of the thyristor 2. Further, FIG. 3 is an enlarged view of the vicinity of zero cross Zc of the voltage waveform of the AC signal in FIG. 2. In FIG.

(2-1) First Digital Signal Generation Process FIG. 4 is a diagram showing an example of the operation flow of the first digital signal generation process by the A/D conversion processing section 11.

(S11) First, the A/D conversion processing unit 11 determines whether the time in the first period has arrived, and in the example shown in FIG. It shows the time at .

(S12) When it is determined that the time in the first cycle has arrived (S11; Yes), the A/D conversion processing unit 11 samples the AC signal input from the level conversion unit 30 to obtain a first digital signal. Generates a signal value as . Each generated signal value is sequentially output as a first digital signal to each of the interpolation processing section 12 and the first time calculation section 151. In the example shown in FIG. 3, the signal values S0, S5, and S10 shown as black plots on the voltage waveform of the AC signal are sampled by the A/D conversion processing unit 11 at times t0, t5, and t10, respectively. This shows a signal value (first digital signal) generated by. The above steps S11 and S12 are executed until the process is completed.

(2-2) First Time Calculation Process FIG. 5 is a diagram showing an example of the operational flow of the first time calculation process by the first time calculation unit 151.

(S21) First, the first time calculation unit 151 selects a set of two temporally consecutive signal values from among the first digital signals input from the A/D conversion processing unit 11. For example, in the example shown in FIG. 3, the signal values S0 and S5 at times t0 and t5 and the signal values S5 and S10 at times t5 and t10 each correspond to a set of two signal values.

(S22) Next, the first time calculation unit 151 determines whether the first signal value is less than zero and the second signal value is greater than or equal to zero in the selected pair of two signal values. judge. If the determination result is negative (S22; No), the process returns to S21. In the example shown in FIG. 3, in the first digital signal, the signal value S0 at time t0 is less than zero, and the signal value S5 at time t5 following time t0 is also less than zero. Therefore, for the set of signal values S0 and S5, the determination result in S22 is negative. On the other hand, the signal value S5 at time t5 is less than zero, and the signal value S10 at time t10 following time t5 is greater than or equal to zero. Therefore, for the set of signal values S5 and S10, the determination result in S22 is positive.

(S23) Next, if the previous signal value is less than zero in S21 and the subsequent signal value is greater than or equal to zero (S21; Yes), the first time calculation unit 151 calculates the value of the subsequent signal value. The corresponding time is determined as the first time. This completes the first time calculation process. In the example shown in FIG. 3, time t10 corresponding to the later signal value S10 among the signal values S5 and S10 for which the determination result of S22 is positive is the first time (the timing of zero cross in the first digital signal). ) is determined as Furthermore, in the example shown in FIG. 2, the code T1 corresponds to the first time.

(2-3) Second Digital Signal Generation Process FIG. 6 is a diagram showing an example of the operation flow of the second digital signal generation process by the interpolation processing section 12.

(S31) First, the interpolation processing unit 12 sets a second cycle for interpolating the first digital signal (oversampling). Here, the method for setting the second period is arbitrary, but for example, the second period may be set by multiplying the first period by a predetermined integer. Specifically, for example, when the first period is approximately 10 kHz, the second period may be set to approximately 10 MHz, which is 1000 times the first period (approximately 10 kHz). In the example shown in FIG. 3, times t0, t1, t2, t3, t4, t6, t7, t8, t9, and t10 each indicate a time in the second cycle. In addition, in FIG. 3, for convenience of explanation, the second period is shown as being five times as long as the first period.

(S32) Next, the interpolation processing unit 12 calculates an approximate curve (including a straight line) connecting two temporally consecutive signal values in the first digital signal. The approximate curve may be, for example, a straight line based on first-order approximation. For example, FIG. 3 shows a linear approximation straight line L1 connecting signal values S0 and S5 and a linear approximation straight line L2 connecting signal values S5 and S10.

(S33) Next, the interpolation processing unit 12 calculates the signal value on the approximate curve corresponding to each time in the second period. The calculated signal value becomes the second digital signal. With this, the process ends. For example, in the example shown in FIG. 3, signal values S1, S2, S3, and S4 corresponding to times t1, t2, t3, and t4 on the linear approximation line L1 are calculated. Similarly, signal values S6, S7, S8, and S9 corresponding to times t6, t7, t8, and t9 on the linear approximation line L2 are calculated.

(2-4) Second Time Calculation Process FIG. 7 is a diagram illustrating an example of the operational flow of the second time calculation process by the second time calculation unit 13.

(S41) First, the second time calculation unit 13 selects a set of two temporally consecutive signal values from among the second digital signals input from the interpolation processing unit 12. For example, in the example shown in FIG. 3, a set of signal values S0 and S1, a set of signal values S1 and S2, a set of signal values S2 and S3, a set of signal values S3 and S4, a set of signal values S4 and S5, a set of signal values Each of the set of values S5 and S6, the set of signal values S6 and S7, the set of signal values S7 and S8, the set of signal values S8 and S9, and the set of signal values S9 and S10 corresponds to a set of two signal values. do.

(S42) Next, the second time calculation unit 13 determines whether the first signal value is less than zero and the second signal value is greater than or equal to zero in the selected pair of two signal values. judge. If the determination result is negative (S42; No), the process returns to S41. In the example shown in FIG. 3, in the second digital signal, the signal value S6 at time t6 is less than zero, and the signal value S7 at time t7 following time t6 is greater than or equal to zero. Therefore, for the set of signal values S6 and S7, the determination result in S42 is positive.

(S43) Next, if the previous signal value is less than zero in S41 and the later signal value is greater than or equal to zero (S41; Yes), the second time calculation unit 13 sets the second time calculation unit 13 to the later signal value. The corresponding time is determined as the second time. This completes the second time calculation process. In the example shown in FIG. 3, time t7 corresponding to the later signal value S7 of the signal values S6 and S7 for which the determination result of S42 is positive is set to the second time (the timing of zero crossing in the first digital signal). ). Furthermore, in the example shown in FIG. 2, the symbol T2 corresponds to the second time.

(2-5) Firing Angle Value Correction Process FIG. 8 is a diagram showing an example of the operational flow of firing angle value correction processing by the firing angle value correction section 152. As shown in FIG. 2, the first time T1, which is the zero-crossing timing in the first digital signal, has a larger deviation from the true zero-crossing timing than the second time T2, which is the zero-crossing timing in the second digital signal. There are many. Therefore, in order to suppress the timing deviation of such a zero cross, the firing angle value correction unit 152 converts the firing angle value supplied by the feedback calculation unit 14 into the difference between the first time T1 and the second time T2. Correct based on.

(S51) First, the firing angle value correction unit 152 calculates the first time T1 (time t7 in FIG. 3) calculated by the first time calculation unit 151 and the second time calculated by the second time calculation unit 13. The difference T2-T1 (t10-t7) from T2 (time t10 in FIG. 3) is calculated as an offset value Δθ.

(S52) Next, the firing angle value correction unit 152 subtracts the offset value Δθ from the firing angle value θ supplied from the feedback calculation unit 14, and calculates the firing angle value θ as the corrected firing angle value. '(=θ−Δθ) is calculated.

(S53) Next, the firing angle value correction section 152 supplies the corrected firing angle value θ' to the firing signal generation section 154. This completes the process.

(2-6) Firing Signal Generation Processing FIG. 9 is a diagram showing an example of the operational flow of firing signal generation processing by the firing signal generation unit 154.

(S61) First, the ignition signal generation unit 154 determines whether a count value has been input from the counter unit 153. Here, for example, a new count value is input to the ignition signal generation section 154 from the counter section 153 in the second cycle described above. The ignition signal generation section 154 repeats S61 until the count value is input from the counter section 153.

(S62) If it is determined that the count value has been input from the counter unit 153 (S61; Yes), the ignition signal generation unit 154 corrects the input count value supplied from the ignition angle value correction unit 152. It is determined whether or not the firing angle value θ' is greater than or equal to the firing angle value θ'. If it is determined that the input count value is not equal to or greater than the corrected firing angle value θ' (S62; No), the process returns to S61.

(S63) If it is determined that the input count value is equal to or greater than the corrected firing angle value θ' (S62; Yes), the firing signal generation unit 154 generates a firing signal and converts the level. It outputs to section 40. This completes the process.

Here, as described above, the firing angle value θ calculated by the feedback calculation unit 14 is corrected to the firing angle value θ′ by the firing angle value correction unit 152. Therefore, the ignition signal generation unit 154 outputs a point corrected from the first time T1, not at time T3, which is the timing at which the ignition angle value θ calculated by the feedback calculation unit 14 has elapsed from the first time T1. An ignition signal is generated at time T4, which is the timing at which the arc angle value θ' has elapsed. The thyristor 2 is fired (turned on) when the firing signal is input to the gate at time T4, and extinguished (turned off) when the AC signal from the AC power supply AC becomes zero at time T5.

The embodiments described above are intended to facilitate understanding of the present invention, and are not intended to be interpreted as limiting the present invention. Each element included in the embodiment, as well as its arrangement, material, conditions, shape, size, etc., are not limited to those illustrated, and can be changed as appropriate. Further, it is possible to partially replace or combine the structures shown in different embodiments.

DESCRIPTION OF SYMBOLS 1... Device, 2... Thyristor, 10... Processor, 11... Analog/digital (A/D) conversion processing part, 12... Interpolation processing part, 13... Second time calculation part, 15... Firing control processing part, 151... First time calculation section, 152... Firing angle value correction section, 153... Counter section, 154... Firing signal generation section, 30... Level conversion section, 40... Level conversion section

Claims (6)

A control device for controlling ignition of a power semiconductor element,
an A/D conversion processing unit that generates a first digital signal by sampling the AC signal in a first period;
an interpolation processing unit that generates a second digital signal by interpolating the first digital signal generated by the A/D conversion processing unit at a second period higher than the first period;
a second time calculation processing unit that calculates a second time at which the second digital signal exceeds the predetermined threshold by comparing the second digital signal generated by the interpolation processing unit with a predetermined threshold;
A control device comprising: an ignition control processing unit that generates an ignition signal for igniting a power semiconductor element based on the second time calculated by the second time calculation processing unit. The ignition control processing section includes:
a first time calculation processing unit that calculates a first time at which the first digital signal exceeds the predetermined threshold by comparing the first digital signal with the predetermined threshold;
a firing angle value correction unit that calculates an offset value that is a difference between the second time and the first time, and corrects the firing angle value by subtracting the offset value from a predetermined firing angle value;
a counter unit that counts in the second period;
The control device according to claim 1, further comprising an ignition signal generation section that generates the ignition signal when the count value output by the counter section exceeds the corrected ignition angle value. The control device according to claim 2, wherein the counter section is configured by a hardware counter. The control device according to any one of claims 1 to 3, wherein the power semiconductor element includes at least one of a unidirectional thyristor, a GTO thyristor, and a triac. A control method for controlling ignition of a power semiconductor device, comprising:
an A/D conversion processing step of generating a first digital signal by sampling the AC signal in a first period;
an interpolation processing step of generating a second digital signal by interpolating the first digital signal generated by the A/D conversion processing step at a second period higher than the first period;
a second time calculation processing step of calculating a second time at which the second digital signal exceeds the predetermined threshold by comparing the second digital signal generated in the interpolation processing step with a predetermined threshold;
A control method comprising: a firing control processing step of generating a firing signal for firing a power semiconductor element based on the second time calculated by the second time calculation processing step. A program for causing an information processing device to control ignition of a power semiconductor element,
The information processing device,
an A/D conversion processing unit that generates a first digital signal by sampling the AC signal in a first period;
an interpolation processing unit that generates a second digital signal by interpolating the first digital signal generated by the A/D conversion processing unit at a second period higher than the first period;
a second time calculation processing unit that calculates a second time at which the second digital signal exceeds the predetermined threshold by comparing the second digital signal generated by the interpolation processing unit with a predetermined threshold;
and a ignition control processing section that generates an ignition signal for igniting a power semiconductor element based on the second time calculated by the second time calculation processing section.

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