CN215010014U - Frequency converter control circuit, control system, converter and integrated cold station - Google Patents
Frequency converter control circuit, control system, converter and integrated cold station Download PDFInfo
- Publication number
- CN215010014U CN215010014U CN202022943691.2U CN202022943691U CN215010014U CN 215010014 U CN215010014 U CN 215010014U CN 202022943691 U CN202022943691 U CN 202022943691U CN 215010014 U CN215010014 U CN 215010014U
- Authority
- CN
- China
- Prior art keywords
- frequency converter
- control circuit
- module
- converter control
- modules
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 239000003990 capacitor Substances 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 7
- 238000011161 development Methods 0.000 abstract description 5
- 238000012827 research and development Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Landscapes
- Inverter Devices (AREA)
Abstract
The application relates to a frequency converter control circuit, a control system, a current transformer and an integrated cold station, wherein the frequency converter control circuit comprises a rectification module, a control module and a plurality of inversion modules; the rectification module provides power supply voltage for the plurality of inversion modules; the control module controls a plurality of inversion module output parameters; the plurality of inversion modules output according to the output parameters of each inversion module under the power supply of the power supply voltage so that each inversion module independently controls the external motor. This application can improve the converter and integrate the degree, reduces the line, strengthens the function, improves the reliability of system, can also reduce the volume, reduces product cost to, adopt the modularized design, saved more design time, shortened development cycle, saved the research and development cost.
Description
Technical Field
The application belongs to the technical field of converters, and particularly relates to a frequency converter control circuit, a control system, a converter and an integrated cold station.
Background
The movable efficient integrated cold station integrates the traditional cold station into a whole, each lower control device is automatically controlled through the controller and the upper computer, and the movable efficient integrated cold station has the advantages of saving cost, shortening period, reducing floor area, being efficient and energy-saving and the like. However, in the highly integrated cold station, it is important to make the space use reasonable and shorten the development period. The control cabinet occupies a large space in the container, however, the frequency converter occupies more space in the control cabinet, a large amount of time is consumed in development and design due to different power of water pumps and fans of each project, and a frequency converter loop is mainly designed according to the water pumps and the fans with different power.
According to the characteristics of a water pump and a fan in a cold station water system, a water loop is generally provided with a freezing pump, a cooling pump and a group of cooling tower fans. Each water pump or fan needs to participate in a large amount of logic control, a traditional control method is that one frequency converter independently controls one motor, in the related art, the frequency converter also has a function of one driving two or more, but has many limitations, for example, the frequency converter occupies a large amount of space in a control cabinet, a circuit control loop in the cabinet is added, the cost is high, in addition, only simple simultaneous frequency modulation and speed regulation can be carried out during frequency conversion control, the safety risk is large, each motor can not be protected independently in a targeted manner, only the control circuit can be switched when the frequency converter is in a stop state, a certain device or a plurality of devices and the like can not be started and stopped independently in the operation process of the frequency converter.
SUMMERY OF THE UTILITY MODEL
In order to overcome the problem that in the related art at least to a certain extent, a frequency converter with two or more than one has high cost, can only simply and simultaneously carry out frequency modulation and speed regulation during frequency conversion control, has high safety risk, cannot pertinently and independently protect each motor, can only switch a control circuit when the frequency converter is in a stop state, cannot independently start and stop a certain device or a plurality of devices and other limitations in the running process of the frequency converter, the application provides a frequency converter control circuit, a control system, a converter and an integrated cold station.
In a first aspect, the present application provides a frequency converter control circuit, including:
the device comprises a rectification module, a control module and a plurality of inversion modules;
the rectification module provides power supply voltage for the plurality of inversion modules;
the control module controls a plurality of inversion module output parameters;
the plurality of inversion modules output according to the output parameters in each inversion module under the power supply voltage so that each inversion module independently controls the external motor.
Further, the rectifier module includes:
the three-phase rectifier bridge is used for converting alternating current into direct current;
the filter capacitor is used for filtering the voltage ripple after full-wave rectification;
a voltage dividing resistor connected in parallel with the filter capacitor;
a current limiting resistor for limiting a charging current of the filter capacitor;
and the switch is used for controlling whether the current-limiting resistor is connected to the rectifying circuit or not.
Further, the method also comprises the following steps:
a power consumption circuit, the power consumption circuit comprising: a brake resistor and a brake unit;
the brake resistor is used for consuming electric energy fed back in the process of reducing the frequency of the plurality of inverter modules;
and the brake unit is used for enabling the discharge current in the fed back electric energy to flow into the brake resistor.
Further, the plurality of inverter modules include:
the power switching devices are respectively connected with the rectifying circuit;
the control module is used for controlling the on and off of each power switch device so as to control the output parameters of the corresponding inversion module.
Further, the output parameters include: voltage and frequency.
Further, the inverter module further includes:
UVW output channel, each UVW output channel independent control external motor.
Further, the plurality of inverter modules include:
the water pump control inversion modules and/or the fan control inversion modules.
In a second aspect, the present application provides a frequency converter control system, comprising:
a frequency converter control circuit, a switching power supply and a drive circuit as described in the first aspect;
the switching power supply provides power for a control circuit in the frequency converter control circuit;
the driving circuit is respectively connected with the control circuit and the plurality of inverter circuits, receives the output parameters of the control circuit and drives the plurality of inverter modules to output according to the output parameters.
Further, the method also comprises the following steps:
and the voltage sampling circuit is connected with the plurality of inversion modules in the frequency converter control circuit and is used for detecting whether the plurality of inversion modules output normally or not.
Further, the method also comprises the following steps:
and the operation display panel is connected with a control circuit in the frequency converter control circuit and is used for receiving external control parameters and displaying output parameters and/or the external control parameters.
Further, the method also comprises the following steps:
and the input and output module is connected with a control circuit in the frequency converter control circuit and used for receiving an external input signal and outputting the signal to the outside.
Further, the method also comprises the following steps:
and the communication module is connected with a control circuit in the frequency converter control circuit and is used for communicating with the outside.
Further, the method also comprises the following steps:
and the transformers are connected with the inverter modules in the frequency converter control circuit and used for monitoring output parameters of the inverter modules.
Further, the method also comprises the following steps:
and the temperature detection module is connected with a control circuit in the frequency converter control circuit and used for detecting the temperature in the frequency converter.
Further, the method also comprises the following steps:
and the fault detection module is connected with the plurality of inverter modules in the frequency converter control circuit and is used for detecting whether the plurality of inverter modules have faults or not.
Further, the method also comprises the following steps:
and the air switch and/or the fuse is connected with a rectifying module in the frequency converter control circuit and is used for performing overcurrent protection on the frequency converter.
In a third aspect, the present application provides a current transformer, comprising:
the frequency converter control system of the second aspect.
In a fourth aspect, the present application provides an integrated cold station comprising:
the current transformer of the third aspect.
The technical scheme provided by the embodiment of the application can have the following beneficial effects:
the embodiment of the application provides a converter control circuit, a control system, converter and integrated cold station, converter control circuit includes rectifier module, control module and a plurality of contravariant module, rectifier module provides supply voltage for a plurality of contravariant modules, a plurality of contravariant module output parameter of control module control, a plurality of contravariant modules are exported according to the output parameter in every contravariant module under the supply voltage power so that every contravariant module independent control external motor, can improve the converter degree of integrating, reduce the line, strengthening function, improve the reliability of system, can also reduce the volume, reduce product cost, and, adopt the modularized design, more design time has been saved, the development cycle has been shortened, save research and development cost.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
Fig. 1 is a functional block diagram of a frequency converter control circuit according to an embodiment of the present application.
Fig. 2 is a circuit diagram of a frequency converter control circuit according to an embodiment of the present application.
Fig. 3 is a functional block diagram of a frequency converter control system according to an embodiment of the present application.
Fig. 4 is a functional block diagram of another frequency converter control system according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail below. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a functional structure diagram of a frequency converter control circuit according to an embodiment of the present application, and as shown in fig. 1, the frequency converter control circuit includes:
the system comprises a rectification module 1, a control module 2 and a plurality of inversion modules 3;
the rectification module 1 provides power supply voltage for the plurality of inversion modules 3;
the control module 2 controls a plurality of inversion module output parameters;
the plurality of inverter modules 3 output according to the output parameters of each inverter module under the power supply of the power voltage so that each inverter module independently controls the external motor.
The water pump and the fan in the high-efficiency integrated cold station are the most devices for field application of frequency converters, the load property of the water pump is a square decreasing torque type, and the water pump has the following relations: the flow rate of the water pump is proportional to the rotation speed, the lift is proportional to the third power of the rotation speed, and the rotation speed of the motor is proportional to the power frequency. Therefore, the frequency of the power supply of the motor is changed, and the rotating speed of the motor, namely the water pump can be changed, so that the purposes of adjusting the water supply flow and the water pump lift are achieved; for a cooling tower, the cooling tower is composed of a plurality of chambers, a fan of the cooling tower of each chamber is controlled according to an actually available frequency converter, the energy-saving effect is achieved, the resistance of the fan wind is in direct proportion to the square of the rotating speed, and the power of a rotating shaft is in direct proportion to the third power of the rotating speed. Therefore, the purpose of controlling the water pump and the fan can be achieved by changing the output parameters of the inverter module.
In some embodiments, the output parameters include: the inverter module comprises a power switch device and a PWM voltage modulation unit, and can respectively control the output frequency and the output voltage of the inverter module. The inversion module realizes the purpose of independently controlling the water pump or the fan by changing the output voltage or the output frequency.
The traditional one drags two or one drags multi-functional converter to have has a lot of limitations, for example, the converter has occupied a large amount of spaces in the switch board, increase circuit control circuit in the cabinet, the cost is higher, and, can only be simple while frequency modulation speed governing when carrying out frequency conversion control, the safety risk is big, can not protect each motor alone to the pertinence, can only be in the off-state at the converter and just can switch control circuit, can not stop a certain equipment or many equipment etc. alone to the converter operation in-process.
In this embodiment, converter control circuit includes rectifier module, control module and a plurality of contravariant module, rectifier module provides supply voltage for a plurality of contravariant modules, a plurality of contravariant module output parameter of control module control, a plurality of contravariant modules are exported according to the output parameter in every contravariant module under the supply voltage power supply so that every contravariant module independent control external motor, can improve the converter degree of integrating, not only can reduce the line, strengthening function, improve the reliability of system, can also reduce the volume, reduce product cost, and, adopt the modularized design, more design time has been saved, the development cycle has been shortened, save research and development cost.
Fig. 2 is a circuit diagram of a converter control circuit according to an embodiment of the present application, and as shown in fig. 2, the converter control circuit includes:
the rectifying module is a three-phase rectifying bridge consisting of six rectifying diodes (or thyristors) VD1-VD6 and converts alternating current into direct current;
filter capacitor CF1、CF2Filtering out voltage ripple after full-wave rectification, and connecting a divider resistor R with equal resistance in parallel on each group of capacitorsC1And RC2So that the direct-current voltage keeps balanced and stable under any load condition;
a current limiting resistor RL for limiting the surge current and a capacitor CF1、CF2The charging current of (a) is limited within a certain range;
the switch SL is used for controlling whether the current-limiting resistor RL is connected with the rectifying circuit or not, and when the frequency converter is started, because the instantaneous current is very large, the SL is disconnected and connected with the current-limiting resistor RL, and at CF1、CF2After the voltage at the two ends is stable, the SL is closed to short-circuit the current-limiting resistor RL, and the SL is one of a thyristor or a switch.
Each inverter module is connected with the rectifier module in parallel to obtain stable direct current meeting the requirements of each inverter module, each independent inverter module is composed of 6 power switching devices (such as IGBTs and the like), in some embodiments, a plurality of inverter modules can be divided into two water pump output inverter modules, and one or two fan output inverter modules;
in some embodiments, the control module (not shown in the figure) may be a single chip or a microcomputer, and controls the power switches in the inverter modules to be turned on and off according to a control rule, so that each inverter module performs three-phase ac output with any frequency.
Because the alternating current that every independent contravariant module output voltage and frequency all can independently be adjusted, then every UVW output channel, but independent control motor solves the limitation problem that traditional converter drags more.
In some embodiments, the frequency converter control circuit further comprises a power consumption circuit, the power consumption circuit comprises a braking resistor RB and a braking unit VB, and the braking resistor RB can consume the electric energy fed back in the process of reducing the frequency of the frequency converter; the brake unit VB may provide a path for the discharge current to flow through RB.
In the embodiment, the rectifier module and the control module are respectively connected with the plurality of inverter modules, and the consumption circuit consumes the electric energy fed back in the frequency reduction process of the frequency converter, so that the limitation that the existing frequency converter cannot independently start and stop a certain device or a plurality of devices when the frequency converter is used for driving a plurality of devices is solved, the cost is reduced, and each motor is pertinently protected.
Fig. 3 is a functional structure diagram of a frequency converter control system according to an embodiment of the present application, and as shown in fig. 3, the frequency converter control circuit includes:
the frequency converter control circuit 301, the switching power supply 302 and the driving circuit 303 as described in the above embodiments;
the switching power supply 302 provides power for the control circuit in the frequency converter control circuit 301;
the driving circuit 303 is connected to the control circuit and the plurality of inverter circuits in the frequency converter control circuit 301, respectively, receives the output parameters of the control circuit, and drives the plurality of inverter modules to output according to the output parameters.
As shown in fig. 4, in some embodiments, the method further includes:
and the voltage sampling circuit 304 is connected with the plurality of inverter modules in the frequency converter control circuit 301, and is used for detecting whether the plurality of inverter modules output normally.
The operation display panel 305 is connected to the control circuit in the inverter control circuit 301, and is used for receiving the external control parameters and displaying the output parameters and/or the external control parameters.
And an input/output module 306 connected to the control circuit in the inverter control circuit 301, for receiving an external input signal and outputting a signal to the outside.
And a communication module 307 connected to the control circuit in the inverter control circuit 301 for communicating with the outside.
And the transformers 308 are connected with the inverter modules in the frequency converter control circuit 301 and used for monitoring output parameters of the inverter modules.
And the temperature detection module 309 is connected with the control circuit in the frequency converter control circuit 301 and is used for detecting the temperature in the frequency converter.
And a fault detection module 310 connected to the multiple inverter modules in the frequency converter control circuit, and configured to detect whether the multiple inverter modules have faults.
And the air switch 311 and/or the fuse 312 are connected with a rectifying module in the frequency converter control circuit 31, and are used for performing overcurrent protection on the frequency converter.
In some embodiments, the switching power supply obtains the stable dc power required by each module after dc-ac-dc conversion.
The driving circuit comprises an optical coupling module and an isolation module, and pulse signals sent by the control circuit drive power switching devices in the inversion modules after being subjected to optical coupling, isolation and power amplification, so that the effect of randomly controlling the output of each inversion module is achieved. Each inversion module is independently connected with a voltage sampling circuit, and the voltage sampling circuit obtains a voltage detection signal for voltage display, over-voltage and under-voltage alarm and shutdown protection.
The three-phase electricity output by each inversion module is connected in series with a mutual inductor and is used for current, output control, overload alarm and shutdown protection of the frequency converter in the normal working process.
The temperature detection circuit is mainly installed on a radiating fin inside the frequency converter and used for detecting the temperature change of the inverter module, and the control circuit gives an alarm and stops the machine for protection when the temperature detection module detects abnormal temperature and controls the operation of a radiating fan in the frequency converter.
The control circuit is connected with the drive circuit, can detect the fault of the power switch device, and controls the photoelectric coupler to generate an OC (optical coupler) signal, alarm and shutdown protection when the power switch device works abnormally.
The display panel is operated to complete the control functions of starting, stopping, communicating and the like of the frequency converter.
The frequency converter is controlled and protected through the modules, the limit value of the maximum output power of each independent inversion module can be set according to the actual connected motor power through operating the display panel, and the modulation strategy of the inversion modules is calculated and comprises the on-off time of each power switch device, so that the frequency converter outputs the required voltage and frequency according to the modulation strategy. In addition, various transmission and speed regulation functions can be realized through different codes, for example, each code corresponds to a parameter set value, and 001 represents the rated power of a motor carried by the frequency converter; 002 represents rated voltage; 003 represents a rated frequency; 004 represents a rated rotating speed and the like, when the running of the motor exceeds a rated set value, the frequency converter reports faults or stops the motor, an internal program of the frequency converter is executed according to set parameters, the parameters can be modified and set on an operation panel of the frequency converter, when the frequency of the motor does not reach the set value, the frequency converter controls the frequency to stably rise until the frequency is stable, the setting is carried out according to the actual parameters of the loaded motor, the starting mode is selected, the upper limit frequency and the lower limit frequency are set, the starting data and the braking mode are set, and the like.
In this embodiment, the frequency converter mainly includes modules for rectification, filtering, inversion, braking, driving, detecting, and controlling according to the internal structure of the frequency converter, and the frequency converter mainly adopts ac-dc-ac control frequency conversion, that is, power frequency ac power is converted into dc power through a rectifier, and then the dc power is converted into ac power with controllable frequency and voltage, and a plurality of independent inversion modules are integrated in the frequency converter, and the frequency converter adopts integral rectification and separate inversion, so that each inversion module outputs independent control.
The present embodiment provides a converter, including: such as the inverter control system in the above-described embodiment.
The present embodiments provide an integrated cold station comprising: such as the current transformer in the above embodiment.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
It should be noted that the present invention is not limited to the above-mentioned preferred embodiments, and those skilled in the art can derive other products in various forms without departing from the scope of the present invention, but any changes in the shape or structure thereof, which have the same or similar technical solutions as the present invention, fall within the protection scope of the present application.
Claims (17)
1. A frequency converter control circuit, comprising:
the device comprises a rectification module, a control module and a plurality of inversion modules;
the rectification module provides power supply voltage for the plurality of inversion modules;
the control module controls a plurality of inversion module output parameters;
the plurality of inversion modules output according to the output parameters in each inversion module under the power supply of the power supply voltage so that each inversion module independently controls an external motor;
further comprising: a power consumption circuit, the power consumption circuit comprising: a brake resistor and a brake unit;
the brake resistor is used for consuming electric energy fed back in the process of reducing the frequency of the plurality of inverter modules;
and the brake unit is used for enabling the discharge current in the fed back electric energy to flow into the brake resistor.
2. The inverter control circuit of claim 1, wherein the rectifier module comprises:
the three-phase rectifier bridge is used for converting alternating current into direct current;
the filter capacitor is used for filtering the voltage ripple after full-wave rectification;
a voltage dividing resistor connected in parallel with the filter capacitor;
a current limiting resistor for limiting a charging current of the filter capacitor;
and the switch is used for controlling whether the current-limiting resistor is connected to the rectifying circuit or not.
3. The inverter control circuit of claim 1, wherein the plurality of inverter modules comprises:
the power switching devices are respectively connected with the rectifying circuit;
the control module is used for controlling the on and off of each power switch device so as to control the output parameters of the corresponding inversion module.
4. The frequency converter control circuit of claim 3, wherein the output parameters comprise: voltage and frequency.
5. The inverter control circuit of claim 3, wherein the inverter module further comprises:
UVW output channel, each UVW output channel independent control external motor.
6. The inverter control circuit of claim 1, wherein the plurality of inverter modules comprises:
the water pump control inversion modules and/or the fan control inversion modules.
7. A frequency converter control system, comprising:
a frequency converter control circuit, a switching power supply and a drive circuit according to any one of claims 1 to 6;
the switching power supply provides power for a control circuit in the frequency converter control circuit;
the driving circuit is respectively connected with the control circuit and the plurality of inverter circuits, receives the output parameters of the control circuit and drives the plurality of inverter modules to output according to the output parameters.
8. The frequency converter control system of claim 7, further comprising:
and the voltage sampling circuit is connected with the plurality of inversion modules in the frequency converter control circuit and is used for detecting whether the plurality of inversion modules output normally or not.
9. The frequency converter control system of claim 7, further comprising:
and the operation display panel is connected with a control circuit in the frequency converter control circuit and is used for receiving external control parameters and displaying output parameters and/or the external control parameters.
10. The frequency converter control system of claim 9, further comprising:
and the input and output module is connected with a control circuit in the frequency converter control circuit and used for receiving an external input signal and outputting the signal to the outside.
11. The frequency converter control system of claim 9, further comprising:
and the communication module is connected with a control circuit in the frequency converter control circuit and is used for communicating with the outside.
12. The frequency converter control system of claim 9, further comprising:
and the transformers are connected with the inverter modules in the frequency converter control circuit and used for monitoring output parameters of the inverter modules.
13. The frequency converter control system of claim 9, further comprising:
and the temperature detection module is connected with a control circuit in the frequency converter control circuit and used for detecting the temperature in the frequency converter.
14. The frequency converter control system of claim 9, further comprising:
and the fault detection module is connected with the plurality of inverter modules in the frequency converter control circuit and is used for detecting whether the plurality of inverter modules have faults or not.
15. The frequency converter control system of claim 9, further comprising:
and the air switch and/or the fuse is connected with a rectifying module in the frequency converter control circuit and is used for performing overcurrent protection on the frequency converter.
16. A current transformer, comprising:
a frequency converter control system as claimed in any one of claims 7 to 15.
17. An integrated cold station, comprising:
the current transformer of claim 16.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022943691.2U CN215010014U (en) | 2020-12-10 | 2020-12-10 | Frequency converter control circuit, control system, converter and integrated cold station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022943691.2U CN215010014U (en) | 2020-12-10 | 2020-12-10 | Frequency converter control circuit, control system, converter and integrated cold station |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215010014U true CN215010014U (en) | 2021-12-03 |
Family
ID=79083384
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022943691.2U Active CN215010014U (en) | 2020-12-10 | 2020-12-10 | Frequency converter control circuit, control system, converter and integrated cold station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215010014U (en) |
-
2020
- 2020-12-10 CN CN202022943691.2U patent/CN215010014U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101141112B (en) | Common DC bus based multi-frequency converter system for vessel | |
| CN202995429U (en) | Frequency conversion air-cooling control device of transformer | |
| CN201130909Y (en) | Removable shore power supply | |
| CN107994781A (en) | A kind of converter plant and its control method | |
| CN110112899A (en) | Drive control circuit and air conditioner | |
| CN209676119U (en) | Drive control circuit and air conditioner | |
| CN201226505Y (en) | High voltage blower/high voltage fan electricity-saving device | |
| CN104539197A (en) | Soft start and voltage reduction power saving comprehensive control device and method for asynchronous motor | |
| CN101378244B (en) | High-voltage motor parallel connection chopping and double-inversion speed-governing energy-saving controller | |
| CN112583236A (en) | Frequency converter control circuit, control system, converter and integrated cold station | |
| CN215010014U (en) | Frequency converter control circuit, control system, converter and integrated cold station | |
| CN201388185Y (en) | Inner-feed chopper cascade speed control device | |
| CN201078842Y (en) | Alternating current machine electricity economizer | |
| CN107994667A (en) | A kind of super capacitor dynamic charge/discharge control method and device | |
| CN101262200B (en) | Multi-frequency converter speed-adjusting system for low-voltage high-power multi-branch AC motor | |
| CN207069918U (en) | Static Electro minor voltage-stabilized power supply | |
| CN202679286U (en) | A pumping unit well group control system based on a DC bus | |
| CN112305332A (en) | Load device for railway vehicle converter test | |
| CN103166543A (en) | Multi-split variable-frequency speed control system of energy-saving feedback type brushless coiling motor | |
| CN201536334U (en) | Chopped-controlled three-phase AC motor energy-saving controller | |
| CN211627761U (en) | High-speed permanent magnet synchronous motor loading device | |
| CN101615492A (en) | Three-winding transformer and variable-frequency speed-regulation power supply system | |
| CN201674458U (en) | High-frequency chopper and inverter serial pole speed regulator | |
| CN105634373A (en) | Oil pumping unit centralized control special-purpose inversion control device | |
| CN202797989U (en) | Static reactive compensation system of wind-power converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |