CN115102383A - Soft start control method and device of frequency converter and soft start control circuit - Google Patents

Soft start control method and device of frequency converter and soft start control circuit Download PDF

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Publication number
CN115102383A
CN115102383A CN202210806380.2A CN202210806380A CN115102383A CN 115102383 A CN115102383 A CN 115102383A CN 202210806380 A CN202210806380 A CN 202210806380A CN 115102383 A CN115102383 A CN 115102383A
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signal
bus voltage
degrees
circuit
synchronization signal
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张统世
张艳婷
周维邦
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • H02M1/36Means for starting or stopping converters
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Motor And Converter Starters (AREA)

Abstract

The invention discloses a soft start control method and device of a frequency converter and a soft start control circuit, wherein the soft start control method of the frequency converter comprises the following steps: acquiring bus voltage; when the bus voltage is less than a preset first threshold value, a movable trigger angle interval of [90 degrees and 180 degrees is adopted]The first synchronization signal of (1); when the bus voltage is greater than or equal to the first threshold value, a movable trigger angle interval of [0 DEG and 180 DEG is adopted]The second synchronization signal of (1). Adopts a first synchronous signal and a second synchronous signal for soft start, wherein the first synchronous signal is used for the bus voltage rising process (from 0V to
Figure DDA0003737837360000011
) The interval is 90 degrees, namely the movable interval of the trigger angle is [90 degrees ] and 180 degrees]The firing angle can be reduced from 180 DEG to 90 DEG with the rise of the bus voltage, so that at the bus voltage greater than or equal to the natural commutation point voltage (at this time, the firing angle is 120 DEG), the situation that the firing angle is changed from 120 DEG to 0 DEG does not occur, therebyThe problem of voltage step is solved.

Description

Soft start control method and device of frequency converter and soft start control circuit
Technical Field
The invention relates to the technical field of control circuits, in particular to a soft start control method and device of a frequency converter and a soft start control circuit.
Background
Because a large-capacitance capacitor is arranged on a bus of the frequency converter for voltage stabilization, in the electrifying process of the frequency converter, a rectifying end can generate instantaneous large current to charge the bus. In order to avoid power-on impact, the prior art provides a soft-start control method based on a thyristor. Specifically, the control method uses a three-phase half-controlled rectification topology, and the rise of the bus voltage is realized mainly by controlling the trigger angle of the thyristor. After the frequency converter is powered on, the soft start controller obtains a trigger angle slightly smaller than 180 degrees (for example 179 degrees) through a preset bus voltage offset value, so that the bus voltage is raised; the rising of the bus voltage can make the trigger angle smaller, namely the trigger interval larger; the bus voltage further rises … and so circulates to the bigger trigger zone, when the bus voltage equals to the natural commutation point voltage (the trigger angle is 120 degrees at this moment), the trigger zone will take place the step, the trigger angle will become 0 degrees, namely the thyristor is conducted completely, the bus voltage will rise to from the natural commutation point voltage steeply, the soft start process is accomplished.
Although the prior art can realize the soft start of the frequency converter, the problem of steep rise of bus voltage caused by triggering angle step still exists, and the larger change rate of the bus voltage can cause larger impact current and possibly damage elements of a circuit.
Disclosure of Invention
In view of this, embodiments of the present invention provide a soft start control method and apparatus for a frequency converter, and a soft start control circuit, so as to solve the problem of steep rise of bus voltage in the existing control method.
According to a first aspect, an embodiment of the present invention provides a soft start control method for a frequency converter, including the following steps: acquiring bus voltage; when the bus voltage is smaller than a preset first threshold value, adopting a first synchronous signal with a trigger angle movable interval of [90 degrees, 180 degrees ]; and when the bus voltage is greater than or equal to the first threshold value, adopting a second synchronous signal with a trigger angle movable interval of [0 degrees and 180 degrees ].
With reference to the first aspect, in a first embodiment of the first aspect, the movable interval using the firing angle is [90 °,180 ° ]]The first synchronization signal of (a) includes: to line voltage U UW 、U VU 、U WV Respectively comparing with the zero point to obtain U,V, W a second synchronous signal of three phases; and adjusting the second synchronous signal by using a preset clock pulse signal to obtain the first synchronous signal.
With reference to the first embodiment of the first aspect, in a second embodiment of the first aspect, the clock pulse signal is a rising edge at a firing angle of 0 °.
With reference to the first aspect, in a third embodiment of the first aspect, the movable interval using the firing angle is [0 °,180 ° ]]The second synchronization signal of (2) comprises: to line voltage U UW 、U VU 、U WV And comparing the three phases with the zero position respectively to obtain U, V, W three-phase second synchronous signals.
With reference to the first aspect, in a fourth implementation manner of the first aspect, before obtaining the bus voltage, the method further includes: the thyristor is turned on and the bus is charged.
According to a second aspect, an embodiment of the present invention further provides a soft start control device for a frequency converter, including an obtaining module and a processing module, where the obtaining module is configured to obtain a bus voltage; the processing module is used for adopting a first synchronous signal with a trigger angle movable interval of [90 degrees and 180 degrees ] when the bus voltage is smaller than a preset first threshold value; and when the bus voltage is greater than or equal to the first threshold value, adopting a second synchronous signal with a trigger angle movable interval of [0 degrees and 180 degrees ].
According to a third aspect, an embodiment of the present invention further provides a soft start control circuit of a frequency converter, including a sampling module, a phase shift signal module, and a synchronization signal module: the sampling module is used for collecting line voltage U UW 、U VU 、U WV (ii) a The phase-shifting signal module is connected with the sampling module and used for transmitting the line voltage U UW 、U VU 、U WV Generating a phase-shifted signal; the synchronous signal module is connected with the sampling module and the phase-shifting signal module and is used for receiving the line voltage U when the bus voltage is smaller than a preset first threshold value UW 、U VU 、U WV And said phase-shift signal generating firing angle movable interval is [90 deg. ], 180 deg]The first synchronization signal of (a); when the bus voltage is greater than or equal toAt the first threshold, according to the line voltage U UW 、U VU 、U WV And the movable interval of the trigger angle generated by the phase-shifting signal is [0 DEG, 180 DEG ]]The second synchronization signal of (1).
With reference to the third aspect, in a first implementation manner of the third aspect, the synchronization signal module includes a line voltage comparison circuit, a zero-crossing comparison circuit, a D flip-flop circuit, a first operation circuit, and a second operation circuit; the line voltage comparison circuit is used for obtaining a clock pulse signal which takes a position with a trigger angle of 0 degree as a rising edge; the zero-crossing comparison circuit is connected with the sampling module and is used for comparing the line voltage U UW 、U VU 、U WV Respectively comparing the first synchronous signal with a zero point bit to obtain a second synchronous signal; the first arithmetic circuit is connected with the line voltage comparison circuit and the zero-crossing comparison circuit and is used for obtaining the first synchronization signal according to the clock pulse signal and the second synchronization signal; the D trigger circuit is connected with the phase-shifting signal module and the line voltage comparison circuit and is used for outputting a low level when the bus voltage is smaller than a preset first threshold value and outputting a high level when the bus voltage is larger than or equal to the first threshold value; the second arithmetic circuit is connected with the D flip-flop circuit, the first arithmetic circuit and the zero-crossing comparison circuit, and is configured to output the first synchronization signal when the bus voltage is smaller than the first threshold value and output the second synchronization signal when the bus voltage is greater than or equal to the first threshold value according to the output signal of the D flip-flop circuit, the first synchronization signal and the second synchronization signal.
With reference to the first embodiment of the third aspect, in a second embodiment of the third aspect, the second arithmetic circuit is configured to perform an and operation on the output signal of the D flip-flop circuit and the second synchronization signal, and perform an or operation on a result of the and operation and the first synchronization signal.
With reference to the third aspect, in a third implementation manner of the third aspect, the soft-start control circuit of the frequency converter further includes a trigger signal module, and the trigger signal module is connected to the synchronization signal module.
The soft start control method, the soft start control device and the soft start control circuit of the frequency converter provided by the embodiment of the invention adopt the first synchronous signal and the second synchronous signal for soft start, and the first synchronous signal is used for the bus voltage rising process (from 0V to 0V)
Figure BDA0003737837340000041
) The interval is 90 degrees, namely the movable interval of the trigger angle is [90 degrees ] and 180 degrees]The firing angle can be reduced from 180 degrees to 90 degrees along with the rising of the bus voltage, so that the situation that the firing angle is changed from 120 degrees to 0 degrees does not occur at the position where the bus voltage is greater than or equal to the natural phase transition point voltage (at the moment, the firing angle is 120 degrees), and the problem of voltage step is solved. When the trigger angle is 90 degrees, the instantaneous value of the bus voltage is
Figure BDA0003737837340000042
At this time, the synchronous signal is changed from the first synchronous signal to the second synchronous signal, and the second synchronous signal is a 180 DEG movable interval of the trigger pulse, that is, the movable range of the trigger angle is [0,180 DEG ]]. When the trigger angle is 90 degrees, the trigger point is stepped, the trigger angle is changed from 90 degrees to 0 degree, and the rectifying end works in a diode mode. Although the trigger point is stepped at this time, the bus voltage is equal to
Figure BDA0003737837340000043
No voltage step occurs.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and not to be construed as limiting the invention in any way, and in which:
FIG. 1 is a prior art circuit block diagram;
FIG. 2 is a waveform diagram of bus voltage rise during soft start in the prior art;
fig. 3 is a schematic flowchart of a soft start control method of a frequency converter in embodiment 1 of the present invention;
FIG. 4 is a waveform diagram of the variation of the conduction interval;
FIG. 5 is a block diagram of an exemplary soft start process;
FIG. 6 is a waveform of the rise of the bus voltage;
FIG. 7 is a circuit diagram of a modified portion of the soft start control circuit;
fig. 8 is a schematic structural diagram of a soft start control device of a frequency converter in embodiment 3 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1, the existing soft start control technology is composed of a sampling module, a phase shift signal module, a synchronous signal module and a trigger signal module, and the slow rising of the bus voltage is realized by controlling the trigger angle to decrease. The basic control principle is as follows:
firstly, a sampling module samples three-phase voltage to obtain line voltage U UW 、U VU 、U WV The positive intervals thereof respectively correspond to U, V, W synchronization signals, namely 180 degrees movable intervals of the firing angle.
Secondly, the phase-shift signal determines the trigger angle of the trigger pulse, the trigger angle is smaller and smaller along with the rise of the bus voltage, the corresponding bus voltage is also larger and larger, and the control effect of soft start is achieved.
And AND operation is carried out on the phase shift signal and the synchronous signal to generate trigger pulse, and the trigger angle is ensured to be in the synchronous signal interval.
The bus rising waveform of the existing soft start control technology is shown in figure 2, and it can be seen that an obvious voltage step phenomenon exists at the later period of bus voltage rising, because the phase-shift signal is greater than or equal to the bus voltage when the trigger angle is reduced from 180 degrees to 0 degreesWhen the voltage of a natural commutation point (the trigger angle is 120 degrees), the pulse mutation can occur, so that the trigger pulse changes, the trigger angle is changed to 0 degrees, and the bus voltage is stepped to the voltage of the natural commutation point
Figure BDA0003737837340000061
Based on this, embodiment 1 of the present invention provides a soft start control method for a frequency converter, fig. 3 is a schematic flow chart of the soft start control method for a frequency converter in embodiment 1 of the present invention, and as shown in fig. 3, the soft start control method in embodiment 1 of the present invention includes the following steps:
s101: and acquiring the bus voltage.
Specifically, the bus voltage can be obtained by sampling the bus voltage through the bus voltage sampling circuit.
S102: when the bus voltage is smaller than a preset first threshold value, adopting a first synchronous signal with a trigger angle movable interval of [90 degrees, 180 degrees ]; and when the bus voltage is greater than or equal to the first threshold value, adopting a second synchronous signal with a movable trigger angle interval of [0 degrees, 180 degrees ].
Specifically, the first threshold is
Figure BDA0003737837340000062
In the soft start control method of embodiment 1 of the present invention, the first synchronization signal and the second synchronization signal are used, and the first synchronization signal is used in the bus voltage rising process (from 0V to 0V)
Figure BDA0003737837340000063
) The interval is 90 degrees, namely the movable interval of the trigger angle is [90 degrees ] and 180 degrees]The firing angle can be reduced from 180 degrees to 90 degrees along with the rising of the bus voltage, so that the situation that the firing angle is changed from 120 degrees to 0 degrees does not occur at the position where the bus voltage is greater than or equal to the natural phase transition point voltage (at the moment, the firing angle is 120 degrees), and the problem of voltage step is solved. When the trigger angle is 90 degrees, the instantaneous value of the bus voltage is
Figure BDA0003737837340000064
At this time, the synchronous signal is changed from the first synchronous signal to the second synchronous signal, and the second synchronous signal is a 180 DEG movable interval of the trigger pulse, that is, the movable range of the trigger angle is [0,180 DEG ]]. When the trigger angle is 90 degrees, the trigger point is stepped, the trigger angle is changed from 90 degrees to 0 degree, and the rectifying end works in a diode mode. Although the trigger point is stepped at this time, the bus voltage is equal to
Figure BDA0003737837340000071
Therefore, the condition of voltage step does not occur, and the improvement requirement is met.
As shown in fig. 4, a waveform 1 is a trigger pulse with a trigger angle smaller than 90 °, a waveform 2 is a trigger pulse with a trigger angle equal to 90 °, and a waveform 3 is a trigger pulse with a trigger angle equal to 0 °.
Specifically, the movable range of the trigger angle is [90 degrees ], 180 degrees]The following technical scheme can be adopted for the first synchronization signal: to line voltage U UW 、U VU 、U WV Comparing with the zero position respectively to obtain U, V, W three-phase second synchronous signals; and adjusting the second synchronous signal by using a preset clock pulse signal to obtain the first synchronous signal. Wherein the clock pulse signal is a rising edge at a firing angle of 0 °.
Specifically, the movable range of the trigger angle is [0 degrees ], 180 degrees DEG]The second synchronization signal of (a) includes: to line voltage U UW 、U VU 、U WV And comparing the three phases with the zero position respectively to obtain U, V, W three-phase second synchronous signals.
Further, before acquiring the bus voltage, the method further includes: the thyristor is turned on and the bus is charged.
To describe the soft start control method according to embodiment 1 of the present invention in more detail, a specific example is given. As shown in fig. 5, the soft start control method includes the steps of:
when the frequency converter is powered on, the soft start controller makes the thyristor obtain a trigger angle slightly less than 180 degrees through a preset bus voltage bias value, the bus voltage rises, and when the frequency converter is powered on, the soft start controller makes the thyristor obtain a trigger angle slightly less than 180 degreesBus voltage less than
Figure BDA0003737837340000072
When the output of the D trigger is low level, the synchronous signal is the first synchronous signal, i.e. the movable interval of the trigger angle is [90 deg. ] and 180 deg. °]. The rising of the bus voltage reduces the firing angle, which in turn further raises the bus voltage. When in use
Figure BDA0003737837340000081
When the output of the D trigger is high level, the synchronous signal is the second synchronous signal, i.e. the movable interval of trigger angle is 0 deg. and 180 deg]At the moment, the trigger angle is changed from 90 degrees to 0 degrees, the thyristor is fully conducted, the rectifying end works in a diode mode, and the soft start is finished.
The voltage rising waveform of the improved soft start bus is shown in figure 6, and the waveform shows that no voltage step phenomenon occurs in the bus rising process, so that the improvement requirement is met.
Example 2
In order to implement the soft start control method of embodiment 1 of the present invention, embodiment 2 of the present invention provides a soft start control circuit of a frequency converter. As shown in fig. 7, the soft start control circuit includes a sampling module, a phase shift signal module and a synchronization signal module.
Specifically, the sampling module is used for collecting line voltage U UW 、U VU 、U WV
The phase-shifting signal module is connected with the sampling module and used for transmitting the line voltage U UW 、U VU 、U WV A phase shifted signal is generated.
The synchronous signal module is connected with the sampling module and the phase-shifting signal module and is used for receiving the line voltage U when the bus voltage is smaller than a preset first threshold value UW 、U VU 、U WV And said phase-shift signal generating firing angle movable interval is [90 deg. ], 180 deg]The first synchronization signal of (1); when the bus voltage is greater than or equal to the first threshold value, the bus voltage is used for being based on the line voltage U UW 、U VU 、U WV And the movable range of the trigger angle generated by the phase-shift signal is [0 DEG, 180 DEG ]]The second synchronization signal of (1).
The main improvement point of the soft start control circuit in embodiment 2 of the present invention is a synchronous signal module, and the sampling module and the phase shift signal module may be the same as those in fig. 1.
Specifically, the synchronous signal module comprises a line voltage comparison circuit, a zero-crossing comparison circuit, a D trigger circuit, a first operational circuit and a second operational circuit; the line voltage comparison circuit is used for obtaining a clock pulse signal which takes a position with a trigger angle of 0 degree as a rising edge; the zero-crossing comparison circuit is connected with the sampling module and is used for comparing the line voltage U UW 、U VU 、U WV Respectively comparing the first synchronous signal with a zero point bit to obtain a second synchronous signal; the first arithmetic circuit is connected with the line voltage comparison circuit and the zero-crossing comparison circuit and is used for obtaining the first synchronization signal according to the clock pulse signal and the second synchronization signal; the D trigger circuit is connected with the phase-shifting signal module and the line voltage comparison circuit and is used for outputting a low level when the bus voltage is smaller than a preset first threshold value and outputting a high level when the bus voltage is larger than or equal to the first threshold value; the second arithmetic circuit is connected with the D flip-flop circuit, the first arithmetic circuit and the zero-crossing comparison circuit, and is configured to output the first synchronization signal when the bus voltage is smaller than the first threshold value and output the second synchronization signal when the bus voltage is greater than or equal to the first threshold value according to the output signal of the D flip-flop circuit, the first synchronization signal and the second synchronization signal.
That is, the specific working principle of the synchronization signal module is as follows:
(1) the clock pulse signal CP with the rising edge at the trigger angle of 0 DEG is obtained through a line voltage comparison circuit.
Specifically, the U-phase clock signal is obtained by comparing the line voltage UW and the WV; the V-phase clock signal is obtained by comparing the line voltage VU and the UW; the W-phase clock signal is obtained by comparing the line voltages WV and VU.
(2) By means of zero-crossing comparison circuits, line voltage U UW 、U VU 、U WV Comparing with zero point respectively to obtain U, V, W three-phase second synchronous signals, wherein the second synchronous signal interval is 180 °, i.e. the movable trigger angle interval is [0,180 ° ]]。
(3) The clock signal and the second synchronous signal generate a first synchronous signal through the arithmetic circuit, and the interval of the first synchronous signal is 90 degrees, namely the movable interval of the trigger angle is [90 degrees, 180 degrees ].
(4) The D trigger takes a phase-shifting signal as a D input signal, takes a signal generated by the line voltage comparison circuit as a clock pulse signal, and is grounded at a 0 setting end R and a 1 setting end S. According to the characteristic of the D trigger, the high level of the set end S and the clear 0 end R is effective, when the high level is low level, the Q is output to be D only at the rising edge of the clock signal, and the Q is kept unchanged at other times. The truth table used in the improved scheme is shown in the table 1, and the bus voltage rises (from 0V to
Figure BDA0003737837340000101
) In the middle, the D signal (phase shift signal) is low at the rising edge of the clock signal, and the output Q of the D flip-flop is always low. When in use
Figure BDA0003737837340000102
Figure BDA0003737837340000103
When the trigger angle is not less than 90 °, the D signal (phase-shifted signal) is high at the rising edge of the clock signal, and the output Q of the D flip-flop is high.
TABLE 1D TRIGGER truth-table
Figure BDA0003737837340000104
×) c: represent rising edge ↓: represents falling edge x: indefinite state
(5) The D trigger outputs Q and the second synchronous signal to do AND operation, and the output of the D trigger and the first synchronous signal to do OR operation to determine the final synchronous signal. During the rise of the bus voltage (flip angle)From 180 deg. to 90 deg.), the output Q of the D flip-flop is always low, and it outputs low after and with the second synchronization signal, and its output is or with the first synchronization signal, and outputs the first synchronization signal, so the synchronization signal is the first synchronization signal in this process. When bus bar
Figure BDA0003737837340000111
When the output Q of the D trigger is high level, the AND operation is carried out with the second synchronous signal to output the second synchronous signal, the OR operation is carried out with the synchronous signal to output the second synchronous signal, and therefore the synchronous signal at the moment is the second synchronous signal.
Example 3
Corresponding to embodiment 1 of the present invention, embodiment 3 of the present invention provides a soft start control device for a frequency converter. As shown in fig. 8, the soft start control device of the frequency converter includes an obtaining module 20 and a processing module 21.
Specifically, the obtaining module 20 is configured to obtain a bus voltage;
the processing module 21 is used for adopting a first synchronous signal with a trigger angle movable interval of [90 degrees and 180 degrees ] when the bus voltage is smaller than a preset first threshold value; and when the bus voltage is greater than or equal to the first threshold value, adopting a second synchronous signal with a trigger angle movable interval of [0 degrees and 180 degrees ].
The details of the soft start control device of the frequency converter can be understood by referring to the corresponding related descriptions and effects in the embodiments shown in fig. 1 to fig. 7, and are not described herein again.
Example 4
Embodiments of the present invention further provide an electronic device, which may include a processor and a memory, where the processor and the memory may be connected by a bus or in another manner.
The processor may be a Central Processing Unit (CPU). The Processor may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, or a combination thereof.
The memory, which is a non-transitory computer-readable storage medium, may be used to store non-transitory software programs, non-transitory computer-executable programs, and modules, such as program instructions/modules (e.g., the obtaining module 20 and the processing module 21 shown in fig. 7) corresponding to the soft start control method of the frequency converter in the embodiment of the present invention. The processor executes various functional applications and data processing of the processor by running the non-transitory software program, instructions and modules stored in the memory, that is, the soft start control method of the frequency converter in the above method embodiment is realized.
The memory may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created by the processor, and the like. Further, the memory may include high speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory optionally includes memory located remotely from the processor, and such remote memory may be coupled to the processor via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The one or more modules are stored in the memory and, when executed by the processor, perform a soft-start control method of the frequency converter as in the embodiments of fig. 1 to 7.
The details of the electronic device may be understood by referring to the corresponding descriptions and effects in the embodiments shown in fig. 1 to fig. 8, and are not described herein again.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, abbreviated as HDD), a Solid State Drive (SSD), or the like; the storage medium may also comprise a combination of memories of the kind described above.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims (10)

1. A soft start control method of a frequency converter is characterized by comprising the following steps:
acquiring bus voltage;
when the bus voltage is smaller than a preset first threshold value, adopting a first synchronous signal with a trigger angle movable interval of [90 degrees, 180 degrees ];
and when the bus voltage is greater than or equal to the first threshold value, adopting a second synchronous signal with a trigger angle movable interval of [0 degrees and 180 degrees ].
2. The method according to claim 1, wherein said first synchronization signal with a firing angle movable interval of [90 °,180 ° ] comprises:
to line voltage U UW 、U VU 、U WV Comparing with the zero position respectively to obtain U, V, W three-phase second synchronous signals;
and adjusting the second synchronous signal by using a preset clock pulse signal to obtain the first synchronous signal.
3. The method of claim 2, wherein the clock pulse signal is a rising edge at a firing angle of 0 °.
4. The method according to claim 1, wherein said employing a second synchronization signal having a firing angle movable interval of [0 °,180 ° ] comprises:
to line voltage U UW 、U VU 、U WV And comparing the three phases with the zero position respectively to obtain U, V, W three-phase second synchronous signals.
5. The method of claim 1, further comprising, prior to obtaining the bus voltage:
the thyristor is turned on and the bus is charged.
6. A soft start control device of a frequency converter is characterized by comprising:
the acquisition module is used for acquiring bus voltage;
the processing module is used for adopting a first synchronous signal with a trigger angle movable interval of [90 degrees and 180 degrees ] when the bus voltage is smaller than a preset first threshold value; and when the bus voltage is greater than or equal to the first threshold value, adopting a second synchronous signal with a trigger angle movable interval of [0 degrees and 180 degrees ].
7. A soft start control circuit for a frequency converter, comprising:
a sampling module for collecting line voltage U UW 、U VU 、U WV
The phase-shifting signal module is connected with the sampling module and is used for transmitting the line voltage U UW 、U VU 、U WV Generating a phase-shifted signal;
the synchronous signal module is connected with the sampling module and the phase-shifting signal module and used for transmitting the line voltage U to the sampling module according to the line voltage U when the bus voltage is smaller than a preset first threshold value UW 、U VU 、U WV And the movable range of the trigger angle generated by the phase-shift signal is [90 degrees ] and 180 degrees]The first synchronization signal of (1); when the bus voltage is greater than or equal to the first threshold value, the bus voltage is used forThe line voltage U UW 、U VU 、U WV And the movable interval of the trigger angle generated by the phase-shifting signal is [0 DEG, 180 DEG ]]The second synchronization signal of (1).
8. The soft-start control circuit of claim 7, wherein the synchronization signal module comprises a line voltage comparison circuit, a zero-crossing comparison circuit, a D flip-flop circuit, a first operational circuit and a second operational circuit;
the line voltage comparison circuit is used for obtaining a clock pulse signal with a rising edge at a trigger angle of 0 degree;
the zero-crossing comparison circuit is connected with the sampling module and is used for comparing the line voltage U UW 、U VU 、U WV Respectively comparing the first synchronous signal with a zero point bit to obtain a second synchronous signal;
the first operational circuit is connected with the line voltage comparison circuit and the zero-crossing comparison circuit and is used for obtaining the first synchronization signal according to the clock pulse signal and the second synchronization signal;
the D trigger circuit is connected with the phase-shifting signal module and the line voltage comparison circuit and is used for outputting a low level when the bus voltage is smaller than a preset first threshold value and outputting a high level when the bus voltage is larger than or equal to the first threshold value;
the second arithmetic circuit is connected with the D flip-flop circuit, the first arithmetic circuit and the zero-crossing comparison circuit, and is configured to output the first synchronization signal when the bus voltage is smaller than the first threshold value and output the second synchronization signal when the bus voltage is greater than or equal to the first threshold value according to the output signal of the D flip-flop circuit, the first synchronization signal and the second synchronization signal.
9. The soft-start control circuit of claim 8, wherein the second operation circuit is configured to and the output signal of the D flip-flop circuit with the second synchronization signal, and or the result of the and operation with the first synchronization signal.
10. The soft-start control circuit of claim 7, further comprising:
and the trigger signal module is connected with the synchronous signal module.
CN202210806380.2A 2022-07-08 2022-07-08 Soft start control method and device of frequency converter and soft start control circuit Pending CN115102383A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115441772A (en) * 2022-11-07 2022-12-06 希望森兰科技股份有限公司 Triggering angle control method for soft starter of asynchronous motor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115441772A (en) * 2022-11-07 2022-12-06 希望森兰科技股份有限公司 Triggering angle control method for soft starter of asynchronous motor
CN115441772B (en) * 2022-11-07 2023-02-07 希望森兰科技股份有限公司 Triggering angle control method for soft starter of asynchronous motor

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