CN207884340U - A kind of air-conditioning charging circuit and air-conditioning with the circuit - Google Patents
A kind of air-conditioning charging circuit and air-conditioning with the circuit Download PDFInfo
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- CN207884340U CN207884340U CN201721766198.XU CN201721766198U CN207884340U CN 207884340 U CN207884340 U CN 207884340U CN 201721766198 U CN201721766198 U CN 201721766198U CN 207884340 U CN207884340 U CN 207884340U
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Abstract
The utility model provides a kind of air-conditioning charging circuit and air-conditioning with the circuit, including AC power, filtering unit, electrolytic capacitor group, rectifier, first switch, second switch and switching controlling part, on the circuit that AC power connects rectifier, first switch and the second switch is set, and second switch is in parallel with first switch, the first switch and the second switch is connect with switching controlling part, and the switching controlling part is used to control the open and close of first switch and the second switch.Compared with the existing technology, air-conditioning charging circuit described in the utility model has the advantage that：(1) air-conditioning charging circuit configuration described in the utility model is simple, and operation is flexible, and reliability is high, solves many hidden danger existing for band PTC charging circuits.(2) air-conditioning charging circuit described in the utility model judges input voltage size by zero cross signal, determines switching time so that charging process is gentle, stablizes.
Description
Technical field
The utility model is related to air-conditioning technical field, more particularly to a kind of air-conditioning charging circuit and sky with the circuit
It adjusts.
Background technology
Large-scale electrolysis capacitance is provided in converter circuit for energy storage, in powered on moment there are prodigious current spike,
It is easy to burn the component in circuit.Therefore it needs to increase charging circuit in circuit, limits current spike.The outer machine of existing frequency conversion
Common way is to add the mode of relay to charge using PTC resistor.
PTC resistor must be used in existing scheme, had the following problems：
1) model is more, and different type of machines uses different model PTC resistor, handling of goods and materials of high cost；
2) large-sized unit needs in parallel using multiple PTC resistors, and cost and volume are big；
3) PTC resistor causes charging to fail since overheat is into high resistant under hot environment；
4) repeatedly frequent charge process causes PTC resistor to enter high resistant, charging process failure.
Utility model content
In view of this, the utility model is directed to a kind of air-conditioning charging circuit so that without using PTC resistor the case where
Under, still make charging current more stable, reliability higher, there is no multiple chargings to lead to the problem of failing of charging, and is also not present
The problem of leading to charging failure using PTC resistor under high temperature environment, circuit structure is simple, advantageous in cost.
In order to achieve the above objectives, the technical solution of the utility model is realized in：
A kind of air-conditioning charging circuit, including AC power, filtering unit, electrolytic capacitor group, rectifier, first switch,
Two switches and switching controlling part, AC power are sequentially connected filtering unit and rectifier, and the rectifier connects with electrolytic capacitor group
It connects, on the circuit that AC power connects rectifier, first switch and the second switch is set, and second switch and first switch are simultaneously
Connection, the first switch and the second switch connect with switching controlling part, and the switching controlling part is used to control first switch and the
The open and close of two switches.
Further, the filtering unit includes filter inductance and the first electrolytic capacitor, and the electrolytic capacitor group includes the
Two electrolytic capacitors, third electrolytic capacitor, the 4th electrolytic capacitor；The rectifier includes the second rectifier bridge, and AC power connects successively
Filter inductance, the first electrolytic capacitor and the second rectifier bridge are connect, second rectifier bridge is electrolysed with the second electrolytic capacitor, third respectively
Capacitance, the 4th electrolytic capacitor are in parallel, and on the circuit that AC power connects the second rectifier bridge, setting first switch and second is opened
It closes, the switching controlling part includes zero passage detection unit and switch control single chip computer, and the zero passage detection unit is exchanged with described
Power supply connects, the zero-acrross ing moment for detecting AC power, described one group of port of switch control single chip computer and the zero passage detection
Unit connects, and another group of port is connect with first switch and the second switch respectively, for what is detected according to zero passage detection unit
Zero-acrross ing moment controls the open and close of first switch and the second switch.
Further, the zero passage detection unit includes the first rectifier bridge, small electrolytic capacitor, Switching Power Supply and zero passage inspection
Slowdown monitoring circuit, AC power connect the first rectifier bridge, and the small electrolytic capacitor of parallel connection and Switching Power Supply, described on first rectifier bridge
Switching Power Supply is connect with switch control single chip computer, for powering to switch control single chip computer；In the first rectifier bridge and small electrolysis electricity
Hold and zero cross detection circuit is set on the circuit of connection, the output end of the zero cross detection circuit is connect with switch control single chip computer.
Further, the zero cross detection circuit includes diode, filter capacitor, metal-oxide-semiconductor and resistance, described resistance one end
It is connect with DC power supply, the source electrode connection of the other end and metal-oxide-semiconductor, the grounded drain of the metal-oxide-semiconductor, the filter capacitor is connected to
Between the drain electrode and ground of metal-oxide-semiconductor, the grid of the metal-oxide-semiconductor is connect with the output end of the first rectifier bridge, the source electrode of the metal-oxide-semiconductor with
Switch control single chip computer connection.
Further, the metal-oxide-semiconductor is P-channel enhancement type metal-oxide-semiconductor.
Further, the zero cross detection circuit includes diode, filter capacitor, triode and resistance, the resistance one
End is connect with DC power supply, the collector connection of the other end and triode, the emitter ground connection of the triode, the filtered electrical
Appearance is connected between the emitter of triode and ground, and the base stage of the triode is connect with the output end of the first rectifier bridge, described
The collector of triode is connect with switch control single chip computer.
Further, the triode is 9014 triode of npn type.
Compared with the existing technology, air-conditioning charging circuit described in the utility model has the advantage that：
(1) air-conditioning charging circuit configuration described in the utility model is simple, and operation is flexible, and reliability is high, solves band PTC
Many hidden danger existing for charging circuit.
(2) air-conditioning charging circuit described in the utility model judges input voltage size by zero cross signal, determines switch
Moment so that charging process is gentle, stablizes.
The utility model additionally provides a kind of air-conditioning, and the air-conditioning uses any air-conditioning charging circuit above-mentioned, and
Use any air-conditioning control method for charging circuit above-mentioned.
The air-conditioning is had compared with the existing technology with above-mentioned air-conditioning charging circuit and air-conditioning control method for charging circuit
Some advantages are identical, and details are not described herein.
Description of the drawings
The attached drawing for constituting the part of the utility model is used to provide a further understanding of the present invention, this practicality is new
The illustrative embodiments and their description of type are not constituted improper limits to the present invention for explaining the utility model.
In attached drawing：
Fig. 1 is a kind of air-conditioning charging circuit circuit first structure schematic diagram described in the utility model embodiment；
Fig. 2 is the second structural schematic diagram of a kind of air-conditioning charging circuit circuit described in the utility model embodiment；
Fig. 3 is a kind of air-conditioning charging circuit circuit third structural schematic diagram described in the utility model embodiment；
Fig. 4 is a kind of the 4th structural schematic diagram of air-conditioning charging circuit circuit described in the utility model embodiment；
Fig. 5 is a kind of the 5th structural schematic diagram of air-conditioning charging circuit circuit described in the utility model embodiment；
Fig. 6 is that the zero passage detection described in the utility model embodiment determines schematic diagram；
Fig. 7 is to determine t1 moment schematic diagrames according to preset voltage value described in the utility model embodiment；
Fig. 8 is to be charged repeatedly schematic diagram to electrolytic capacitor group described in the utility model embodiment；
Fig. 9 is to carry out the multistage to electrolytic capacitor group described in the utility model embodiment to charge repeatedly schematic diagram.
Reference sign：
1- AC powers, 20- filtering units, 2- filter inductances, the first electrolytic capacitors of 3-, 40- electrolytic capacitor groups, 4- second
Electrolytic capacitor, 5- third electrolytic capacitors, the 4th electrolytic capacitors of 6-, 70- rectifiers, the second rectifier bridges of 7-, 8- first switches, 9-
Two switches, 10- switching controlling parts, 101- zero passage detection units, the first rectifier bridges of 1011-, the small electrolytic capacitors of 1012-, 1013- are opened
Powered-down source, 1014- zero cross detection circuits, 1014a- diodes, 1014b- filter capacitors, 1014c-MOS pipes, 1014d- resistance,
1015- triodes, 102- switch control single chip computer.
Specific implementation mode
It should be noted that in the absence of conflict, the feature in the embodiments of the present invention and embodiment can
To be combined with each other.
The utility model will be described in detail below with reference to the accompanying drawings and embodiments.
A kind of air-conditioning charging circuit, as shown in Figure 1, including AC power 1, filtering unit 20, electrolytic capacitor group 40, rectification
Device 70, first switch 8, second switch 9 and switching controlling part 10, AC power 1 are sequentially connected filtering unit 20 and rectifier 70,
The rectifier 70 is connect with electrolytic capacitor group 40, and on the circuit that AC power 1 connects rectifier 70, first switch 8 is arranged
With second switch 9, and second switch 9 is in parallel with first switch 8, the first switch 8 and second switch 9 and switching controlling part 10
Connection, the switching controlling part 10 are used to control the open and close of first switch 8 and second switch 9.Using such circuit
Structure, can by switching controlling part 10 according to preset switching logic using programming in the way of control first switch 8 and second
The open and close of switch 9, and switching controlling part 10 can be used to control the closure duration of second switch 9 and disconnect duration, into
And realize the intermittent purpose to the charging of electrolytic capacitor group so that the charging of electrolytic capacitor group is steady, and charging time width
Size is adjustable；PTC element has been saved, cost is reduced.
Specifically, as shown in Fig. 2, the filtering unit 20 includes filter inductance 2 and the first electrolytic capacitor 3, the electrolysis
Capacitance group 40 includes the second electrolytic capacitor 4, third electrolytic capacitor 5, the 4th electrolytic capacitor 6；The rectifier 70 includes second whole
Bridge 7 is flowed, AC power 1 is sequentially connected filter inductance 2, the first electrolytic capacitor 3 and the second rectifier bridge 7, and second rectifier bridge 7 divides
It is not in parallel with the second electrolytic capacitor 4, third electrolytic capacitor 5, the 4th electrolytic capacitor 6, connect the second rectifier bridge 7 in AC power 1
Circuit on, first switch 8 and second switch 9 are set, and the switching controlling part 10 includes that zero passage detection unit 101 and switch are controlled
Microcontroller 102 processed, the zero passage detection unit 101 are connect with the AC power 1, when zero passage for detecting AC power
It carves, described 102 1 groups of ports of switch control single chip computer connect with the zero passage detection unit 101, and another group of port is respectively with the
One switch 8 and second switch 9 connect, and the zero-acrross ing moment for being detected according to zero passage detection unit 101 controls 8 He of first switch
The open and close of second switch 9.
In the present invention, by the parallel connection of second electrolytic capacitor 4, third electrolytic capacitor 5, the 4th electrolytic capacitor 6
Body is known as electrolytic capacitor group, it is possible to understand that, in the charge circuit with electrolytic capacitor group occupation mode described in the utility model
The identical capacitive element being made of one or more capacitances can consider and electrolytic capacitor group described in the utility model
It is equivalent.
Further, as shown in figure 3, the zero passage detection unit 101 includes the first rectifier bridge 1011, small electrolytic capacitor
1012, Switching Power Supply 1013 and zero cross detection circuit 1014, AC power 1 connects the first rectifier bridge 1011, whole described first
Flow small electrolytic capacitor 1012 and Switching Power Supply 1013, the Switching Power Supply 1013 and switch control single chip computer in parallel on bridge 1011
102 connections, for powering to switch control single chip computer 102；In the line that the first rectifier bridge 1011 is connect with small electrolytic capacitor 1012
The output end of road setting zero cross detection circuit 1014, the zero cross detection circuit 1014 is connect with switch control single chip computer 102.
Specifically, as shown in figure 4, the zero cross detection circuit 1014 include diode 1014a, filter capacitor 1014b,
Metal-oxide-semiconductor 1014c and the one end resistance 1014d, the resistance 1014d are connect with DC power supply, the source of the other end and metal-oxide-semiconductor 1014c
Pole connects, the grounded drain of the metal-oxide-semiconductor 1014c, and the filter capacitor 1014b is connected to drain electrode and the ground of metal-oxide-semiconductor 1014c
Between, the grid of the metal-oxide-semiconductor 1014c is connect with the output end of the first rectifier bridge 1011, the source electrode of the metal-oxide-semiconductor 1014c with open
Control single chip computer 102 is closed to connect.Specifically, the metal-oxide-semiconductor 1014c is P-channel enhancement type metal-oxide-semiconductor.
Further, as shown in figure 5, zero detection circuit 1014 can also include diode 1014a, filter capacitor
1014b, triode 1015 and the one end resistance 1014d, the resistance 1014d are connect with DC power supply, the other end and triode
1015 collector connection, the emitter ground connection of the triode 1015, the filter capacitor 1014b are connected to triode 1015
Emitter and ground between, the base stage of the triode 1015 is connect with the output end of the first rectifier bridge 1011, the triode
1015 collector is connect with switch control single chip computer 102.Specifically, the triode 1015 can use npn type 9,014 3
Pole pipe.
The utility model additionally provides a kind of air-conditioning control method for charging circuit, described using aforementioned air-conditioning charging circuit
First switch second switch is normal open switch, the method includes：
Step 1：Switch control single chip computer receives the zero cross signal that zero cross detection circuit is sent out, and record receives the zero passage
T0 at the time of signal；
Step 2：Switch control single chip computer is closed second switch at the t1 moment, and the wherein t1 moment is later than the t0 moment；
Step 3：Switch control single chip computer disconnects second switch at the t2 moment, and the wherein t2 moment is later than the t1 moment；
Step 4：Whether the voltage in switch control single chip computer detection electrolytic capacitor group reaches maximum value, if so, disconnecting
Second switch is closed first switch, if it is not, then returning to step 1.
As shown in fig. 6, after alternating current passes through rectifier bridge, an only special Wave with half of sine wave can be formed
Shape, the more enough functions of the waveform | sinx | corresponding to indicate, the alternating current zero-acrross ing moment that zero cross detection circuit detects,
Even if waveform is carved at the beginning of the new period after rectification, since zero-acrross ing moment, during the second switch is connected, after rectification
Voltage charges to electrolytic capacitor group according to the changing rule of SIN function, in order to enable charging current is more steady, makes
Voltage in electrolytic capacitor group slowly increases, and is unlikely to damage electrolytic capacitor group, as shown in fig. 7, detecting with zero cross detection circuit
To alternating current zero-acrross ing moment be the t0 moment, the second switch at least the t0 moment be off-state, later after a period of time,
When reaching the t1 moment, switch control single chip computer control second switch is closed, and the alternating current after rectification starts to electrolytic capacitor at this time
Group charging, lasting charging a period of time, when reaching the t2 moment, switch control single chip computer control second switch disconnects, after rectification
Alternating current no longer to electrolytic capacitor group charge, later, when zero cross detection circuit detects alternating current zero-acrross ing moment again, press
The charging of a new round is carried out according to preceding method.Using such charging modes, enables to charging current more steady, make electrolysis
Voltage in capacitance group slowly increases, and can play the protective effect to electrolytic capacitor group.
Further, t1-t0 is the first predetermined time period, and t2-t1 is the second predetermined time period.The t1-t0's
The duration of duration and t2-t1 can be the time span by being experimentally determined in laboratory, in the charging detecting circuit
Before use, corresponding first predetermined time period and the second predetermined time period are stored in advance in depositing for switch control single chip computer
It stores up in air-conditioning, the first predetermined time period and the second predetermined time period is called when in use to switch control single chip computer.
Further, first predetermined time period≤5ms, the second predetermined time period≤10ms.
Further, the switch control single chip computer can also be detected by the voltage value of the first rectifier bridge output voltage,
Under the premise of this, since zero-acrross ing moment, detect that the first rectifier bridge output voltage value reaches for the first time to switch control single chip computer
To being the t1 moment at the time of preset voltage value, and the different t2 moment is determined according to the different t1 moment.As shown in fig. 7, can
According to the pressure-resistant property of electrolytic capacitor group and it is expected the charging duration that reaches come when determining that second switch is closed (i.e. when t1
Carve) voltage and corresponding charging duration can be according to SIN function after preset voltage value is determined at this voltage
Property the moment is determined as the t1 moment at the time of being calculated that waveform reaches preset voltage value for the first time after rectification,
After when t1 is determined, i.e., the t1 moment is delayed after desired charging duration, obtains the t2 moment.
Further, it due to the parallel connection that electrolytic capacitor group is big electrolytic capacitor, is only charged in short-term with small voltage, can make electricity
It is slow to solve capacitance group charging, and then the switch control single chip computer may determine that and charge to electrolytic capacitor group under preset voltage value
Number whether reach preset charged number, if so, increasing preset voltage value, determined according to the preset voltage value after increase new
Preset charged number continues to charge to electrolytic capacitor group, until electrolytic capacitor group charging complete.As shown in figure 8, from first t0
Moment proceeds by charging with the smaller preset voltage value corresponding t1 moment, when charge repeatedly preset times after, can be with
Think that electrolytic capacitor group can bear the voltage of bigger, at this moment preset voltage value can be improved to (corresponding t1 moment certainty
Change), continue to charge.
Specifically, the switch control single chip computer fills electrolytic capacitor group charging process including the first charging stage, second
Electric stage, third charging stage, the 4th charging stage, the 5th charging stage, the 6th charging stage and charging complete stage, each
The charging stage corresponds to the preset voltage value being sequentially increased, and each preset voltage value corresponds to different preset charged numbers；Institute
Stating the charging complete stage includes：Second switch disconnects after being closed preset duration, is closed at first switch.
Specifically, as shown in figure 9, the AC power is 370V AC powers；
First charging stage corresponding preset voltage value is 20V, corresponding t2-t1=100us, corresponding preset charged number
It is 20 times；
Second charging stage corresponding preset voltage value is 50V, corresponding t2-t1=500us, corresponding preset charged number
It is 10 times；
Third charging stage corresponding preset voltage value is 100V, corresponding t2-t1=800us, corresponding preset charged time
Number is 10 times；
4th charging stage corresponding preset voltage value is 200V, corresponding t2-t1=1ms, corresponding preset charged number
It is 10 times；
5th charging stage corresponding preset voltage value is 250V, corresponding t2-t1=2ms, corresponding preset charged number
It is 10 times；
6th charging stage corresponding preset voltage value is 300V, corresponding t2-t1=2ms, corresponding preset charged number
It is 10 times.
Specifically, the charging complete stage is：Second switch disconnects after being closed 10ms, is closed at first switch.
Specifically, the utility model embodiment additionally provides a kind of air-conditioning, the air-conditioning uses any sky above-mentioned
Charging circuit is adjusted, and uses any air-conditioning control method for charging circuit above-mentioned.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Within the spirit and principle of utility model, any modification, equivalent replacement, improvement and so on should be included in the utility model
Protection domain within.
Claims (7)
1. a kind of air-conditioning charging circuit, which is characterized in that including AC power (1), filtering unit (20), electrolytic capacitor group
(40), rectifier (70), first switch (8), second switch (9) and switching controlling part (10), AC power (1) are sequentially connected filter
Wave component (20) and rectifier (70), the rectifier (70) connect with electrolytic capacitor group (40), are connected in AC power (1) whole
On the circuit for flowing device (70), setting first switch (8) and second switch (9), and second switch (9) is in parallel with first switch (8),
The first switch (8) and second switch (9) are connect with switching controlling part (10), and the switching controlling part (10) is for controlling the
The open and close of one switch (8) and second switch (9)；The filtering unit (20) includes filter inductance (2) and the first electrolysis
Capacitance (3), the electrolytic capacitor group (40) include the second electrolytic capacitor (4), third electrolytic capacitor (5), the 4th electrolytic capacitor
(6)；The rectifier (70) includes the second rectifier bridge (7), and AC power (1) is sequentially connected filter inductance (2), the first electrolysis electricity
Hold (3) and the second rectifier bridge (7), second rectifier bridge (7) respectively with the second electrolytic capacitor (4), third electrolytic capacitor (5),
4th electrolytic capacitor (6) is in parallel, on the circuit that AC power (1) connects the second rectifier bridge (7), setting first switch (8) and
Second switch (9), the switching controlling part (10) includes zero passage detection unit (101) and switchs control single chip computer (102), described
Zero passage detection unit (101) is connect with the AC power (1), the zero-acrross ing moment for detecting AC power, the switch control
(102) one groups of ports of microcontroller processed are connect with the zero passage detection unit (101), another group of port respectively with first switch (8)
Connected with second switch (9), zero-acrross ing moment control first switch (8) for being detected according to zero passage detection unit (101) and
The open and close of second switch (9).
2. air-conditioning charging circuit according to claim 1, which is characterized in that the zero passage detection unit (101) includes the
One rectifier bridge (1011), small electrolytic capacitor (1012), Switching Power Supply (1013) and zero cross detection circuit (1014), AC power
(1) the first rectifier bridge of connection (1011), the small electrolytic capacitor (1012) of parallel connection and switch electricity on first rectifier bridge (1011)
Source (1013), the Switching Power Supply (1013) connect with switch control single chip computer (102), are used for switch control single chip computer
(102) it powers；Zero cross detection circuit is set on the circuit that the first rectifier bridge (1011) is connect with small electrolytic capacitor (1012)
(1014), the output end of the zero cross detection circuit (1014) is connect with switch control single chip computer (102).
3. air-conditioning charging circuit according to claim 2, which is characterized in that the zero cross detection circuit (1014) includes two
Pole pipe (1014a), filter capacitor (1014b), metal-oxide-semiconductor (1014c) and resistance (1014d), described resistance one end (1014d) with it is straight
Galvanic electricity source connects, and the other end is connect with the source electrode of metal-oxide-semiconductor (1014c), the grounded drain of the metal-oxide-semiconductor (1014c), the filtering
Capacitance (1014b) is connected between the drain electrode and ground of metal-oxide-semiconductor (1014c), the grid of the metal-oxide-semiconductor (1014c) and the first rectification
The output end of bridge (1011) connects, and the source electrode of the metal-oxide-semiconductor (1014c) is connect with switch control single chip computer (102).
4. air-conditioning charging circuit according to claim 3, which is characterized in that the metal-oxide-semiconductor (1014c) enhances for P-channel
Type metal-oxide-semiconductor.
5. air-conditioning charging circuit according to claim 2, which is characterized in that the zero cross detection circuit (1014) includes two
Pole pipe (1014a), filter capacitor (1014b), triode (1015) and resistance (1014d), described resistance one end (1014d) with it is straight
Galvanic electricity source connects, and the other end is connect with the collector of triode (1015), the emitter ground connection of the triode (1015), described
Filter capacitor (1014b) is connected between the emitter and ground of triode (1015), the base stage of the triode (1015) and the
The output end of one rectifier bridge (1011) connects, and the collector of the triode (1015) is connect with switch control single chip computer (102).
6. air-conditioning charging circuit according to claim 5, which is characterized in that the triode (1015) is npn type 9014
Triode.
7. a kind of air-conditioning, which is characterized in that the air-conditioning uses any air-conditioning charging circuit of claim 1~6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721766198.XU CN207884340U (en) | 2017-12-18 | 2017-12-18 | A kind of air-conditioning charging circuit and air-conditioning with the circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721766198.XU CN207884340U (en) | 2017-12-18 | 2017-12-18 | A kind of air-conditioning charging circuit and air-conditioning with the circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109245512A (en) * | 2018-10-16 | 2019-01-18 | 珠海格力电器股份有限公司 | Control method, system and device of high-power frequency converter and storage medium |
| CN109936202A (en) * | 2017-12-18 | 2019-06-25 | 奥克斯空调股份有限公司 | A kind of air-conditioning charging circuit, charge control method and air-conditioning with the circuit |
| WO2023226253A1 (en) * | 2022-05-25 | 2023-11-30 | 中山大洋电机股份有限公司 | Permanent-magnet electric motor system and soft start method |
-
2017
- 2017-12-18 CN CN201721766198.XU patent/CN207884340U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109936202A (en) * | 2017-12-18 | 2019-06-25 | 奥克斯空调股份有限公司 | A kind of air-conditioning charging circuit, charge control method and air-conditioning with the circuit |
| CN109245512A (en) * | 2018-10-16 | 2019-01-18 | 珠海格力电器股份有限公司 | Control method, system and device of high-power frequency converter and storage medium |
| WO2023226253A1 (en) * | 2022-05-25 | 2023-11-30 | 中山大洋电机股份有限公司 | Permanent-magnet electric motor system and soft start method |
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