CN201044422Y - Intelligent general frequency converter - Google Patents

Intelligent general frequency converter Download PDF

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Publication number
CN201044422Y
CN201044422Y CNU2007200368663U CN200720036866U CN201044422Y CN 201044422 Y CN201044422 Y CN 201044422Y CN U2007200368663 U CNU2007200368663 U CN U2007200368663U CN 200720036866 U CN200720036866 U CN 200720036866U CN 201044422 Y CN201044422 Y CN 201044422Y
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circuit
resistance
signal
output
input
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CNU2007200368663U
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Chinese (zh)
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李星坤
朱云亮
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LEXING INDUSTRIAL SYSTEMS (WUXI) Co Ltd
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LEXING INDUSTRIAL SYSTEMS (WUXI) Co Ltd
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Abstract

The utility model relates to an intelligent general frequency converter (IC5). A control circuit of the utility model mainly adopts that: an input end of a power input circuit is connected with a rectifier circuit; the rectifier circuit is connected with a filter circuit; the filter circuit is connected respectively with an inverter circuit and a switching power circuit; the inverter circuit is connected with a power output circuit; the power output circuit is connected with a microprocessor; the microprocessor is connected respectively with the inverter circuit and a display-control input panel; the power output circuit is connected with a current sensor. The utility model can realize efficient continuous speed regulating control to AC motors in a large range, realizes speed regulating control to motors as well as the positive-reverse rotation switching of motors, can execute continuous high-frequency start and stop operation, adapts to work in various environments, and is characterized in large torque, high precision, low noise, complete functions, reliable running, simple operation, convenient maintenance, energy economization, etc.

Description

The intelligent type universal frequency converter
Technical field
The utility model relates to a kind of intelligent type universal frequency converter (IG5), specifically is applied to industries such as industrial automation control and household electrical appliance, carries out the AC power of frequency modulation and voltage modulation.
Background technology
Frequency converter, can be called AC frequency conversion speed regulator again is to use principle of vector control, adopts modular construction, the set digital technology, computer technology and present automated control technology are in the intelligent AC motor speed control device of one.Frequency converter is the stationary apparatus that direct current is rectified into interchange, but comprise usually ac converter is become direct current, is used for the speed control of squirrel cage motor, and rotating speed of motor is directly proportional with frequency.
Frequency converter can carry out the AC power of frequency modulation and voltage modulation, can drive multiple motors simultaneously by a frequency converter, thereby the investment of the equipment of saving, behind the power supply of frequency converter by one interchange of interchange one direct current, the driving asynchronous machine, so utilize frequency converter, the power factor (PF) of drive motor is higher, and is not subjected to the influence of motor power (output) factor.
Utilize frequency converter, alternating current motor is carried out the AC drawing system of speed regulating control, easily realize speed regulating control to motor, the continuous speed regulating control of higher primary school in can realizing on a large scale realizes that easily the rotating of motor is switched, and can continuous high-frequency start-stop move, can adapt to work under the various environment, can a frequency converter be controlled by multiple motors, power factor height can be formed the high performance of control system.
The patent No. is disclosed as Chinese patent: 02206856.2, name is called " frequency converter ".Itself and motor are supporting, the stepless speed regulation of may command motor.Control circuit mainly adopts 3 integrated packages, frequency setting 3 resistance, be electrically connected to produce three square-wave pulse variable ratio frequency changer signal sources.The pressure regulation level is set with 3 resistance with 3 integrated packages, voltage, is electrically connected, but produces three square-wave pulse pressure regulation signals.The unified control of two signal sources just produces three square-wave pulse synchronous frequency conversion pressure regulation signal sources.Amplify by 3 cover driving stages, supply with the inversion speed-governing motor, but just stepless speed regulation.Though this kind structure frequency converter volume is less, no harmonic wave, more complicated.
On frequency changer, along with improving constantly that radiator heat-dissipation is required, it is fast more that radiator fan also changes more, and corresponding is, and noise that fan sends is also increasing.Though manufacturer, pursues best radiating effect in order to reduce the size that noise continues to increase radiator fan and reduces the dilemma that rotation speed of the fan reduces noise.Rotation speed of the fan is controlled in employing respectively and suitable capacity size reduces the optimal balance point that noise reaches heat radiation and noise reduction.The most cables that adopt of wiring board upper-part weld, and along with the passing of operating time, pad is easy to generate bad.Frequency converter housing low capacity, volume are big, and parts adopt screw to connect the dismounting inconvenience.
Summary of the invention
The purpose of this utility model is to overcome above-mentioned weak point, thereby a kind of intelligent type universal frequency converter is provided, and can realize the speed regulating control of interior high-efficiency and continuous to alternating current motor on a large scale, easily realize the speed regulating control of motor and the rotating of motor are switched, can continuous high-frequency start-stop move, adapt to work under the various environment, and it is big to have a torque, the precision height, noise is low, and is multiple functional, reliable, simple to operate, easy to maintenance, characteristics such as energy savings.
Main solution of the present utility model is achieved in that
The utility model mainly adopts control circuit board and power panel is set in housing, and control circuit is located on control circuit board and the power panel, and control circuit comprises rectification circuit and inverter circuit, and feature is:
Described power supply input circuit output connects the input of rectification circuit;
Rectification circuit output end is connected to the filter circuit input, and described filter circuit makes current conversion become direct current;
The output of filter circuit is connected with inverter circuit and switching power circuit input, and described inverter circuit is transformed into AC power to direct current, and the signal of inverter is controlled by microprocessor;
The output of inverter circuit connects the input of power output circuit, described power output circuit be from the inverter circuit output current to power output circuit, power output circuit electric current output current is to motor;
Switching power circuit connects microprocessor, obtains power supply from filter circuit, and the out-put supply signal is to microprocessor;
Output end of microprocessor connects inverter circuit and demonstration and control input panel respectively, and input circuit is that current sensor obtains, control panel and Switching Power Supply.Microprocessor is used for computing and processing signals;
Described demonstration and input panel are state and the control of conversion devices that shows frequency converter, and panel is from the microprocessor input signal, and output signal is to microprocessor again.
Power output circuit connects current sensor, and described current sensor detects size of current from power output circuit, carries out conversion of signals, feeds back to the central signal processor again.
Described housing is connected with the radiator buckle.Described housing is connected with the cooling fan buckle.Described housing is connected with the front shroud buckle.
Compared with the prior art the utility model has the following advantages:
1, the small and exquisite no sensing vector control of conversion device of multiple functional, volume: structure is easy to assembly, and multiple-use card links and connects, easy accessibility, and volume is little.
2, no sensing vector control: built-in no sensing vector control provides fabulous speed control and powerful high torque (HT) effect, and parameters of hydraulic motor is from adjusting when stopping.
Can provide earth fault protection when 3, moving: run duration can be lead-out terminal the earth fault protection function is provided.
4, cooling fan control: by the control cooling fan, IG5 can provide very quietly environment according to running status.
5, be applicable to the high-precision applications occasion: by monitoring frequency converter internal temperature, IG5 is carrier frequency capable of automatic changing when temperature is too high; Torque is big during low frequency, the degree of protection height.
6, user-friendly interface: 4 directionkeys enable easily to grasp and monitoring, and charactron shows that simple button operation gets final product.
7, under the environment for use mal-condition: when for example coal industry used, powder (as carbon dust) was corrosive in the environment; The easy short circuit of control board; So the coating of control circuit board is handled, and adds thick coating, avoid that there was dampness in the air or dust causes the short circuit of printed substrate plate.
8, control mode flexibly: upper control: the isolation RS 485 interface, adopt standard MODBUS communication protocol, can be connected with upper system such as scattered control system, optimize and coordinate to control; Long-range input and output control, built-in RS-485 communication links to each other with remote switch amount signal, supports Long-distance Control and monitoring between IG5 and other the equipment.
9, internal PID control: internal PID function can be carried out closed-loop control according to customer requirements, realizes constant voltage, constant current operation, and pid parameter is online adjustable; Can control flow rate, oil pressure and temperature or the like; Need not extra controller.
10, PNP/NPN input: can carry out PNP and NPN input, therefore can use external power source; For this reason, user's controller is selected more.
11, multiple frequency given way: directly given by main interface; Given by analog signal (10～+ 10V or 0～20 milliampere of signal); Given by host computer by the RS485 port; Many grades of velocity setting are suitable for the cyclic variation operating mode; During operation with closed ring, given automatically by calculating by internal PID;
12, voltage is adjusted function automatically: frequency converter is according to Voltage Feedback; automatically regulate output voltage; make its influence that is not subjected to line voltage and load variations, protect motor to avoid insulation harm or the close too high iron core excessive heating that causes of magnetic that causes because of long-term overtension.
13, current-limiting function: when the frequency converter output current surpasses set point, frequency converter avoids frequency converter in the acceleration and deceleration process or because of load changes the overcurrent protection that causes suddenly the output of volitional check electric current, reduces to greatest extent and shuts down number of times.
14, instantaneous power-off following function: during the net instantaneous power-off, the Frequency Converter Control motor is in generating state, keeps decelerate, if power system restoration is normal, frequency converter returns back to former running status immediately.It is relevant with load size and inertia to hold time, and the fans load representative value is 5s.
15, self-diagnostic function: the IG5 frequency converter has perfect diagnosis capability certainly, online monitoring system state.When fault took place, frequency converter was taked corresponding safeguard measure automatically, and the operational factor when preserving time that fault takes place, reason, fault point and fault, can help the attendant to find failure cause rapidly, fixed a breakdown.
Description of drawings
Fig. 1, Fig. 2, Fig. 3 are the utility model STRUCTURE DECOMPOSITION schematic diagram.
Fig. 4 is the utility model circuit frame principle figure.
Fig. 5 is the utility model switching power circuit components and parts catenation principle figure.
Embodiment
Embodiment during following the utility model is incited somebody to action in conjunction with the accompanying drawings is further described:
As Fig. 1, Fig. 2, shown in Figure 3:
Power inverter 1 is combined closely with Aluminium Radiator 2 bottom surfaces use heat-conducting silicone grease one white dope and is connected, power inverter 1 quick heat radiating, heat conduction is distributed on the fin thereby increase area of dissipation to radiator 2 bottom surfaces, adopts screw to install with Aluminium Radiator 2.Aluminium Radiator 2 is connected with housing 8 buckles.Cooling fan 3 rotates by cooling fan heat delivered is gone out beyond the product, and the cross-ventilation air channel is forced but cold.Cooling fan 3 is connected with housing 8 buckles, only needs the both sides buckle to pin and can take out, and the input and output loam cake adopts buckle to be connected with screw with housing 8 housings and gets final product.Electric capacity 4 is mainly done filtering, and 6 electric capacity 4 are arranged in the fin side, and caloric value is big, and the heat of generation is by cooling fan convection current air channel, forces but coldly, makes the inner working temperature that keeps of product.Current sensor 5 detects size of current, feeds back signal to microprocessor.Transducer control circuit and current sensor 5 and power panel binding post 6 etc. are set respectively on control circuit power panel 7.Power panel binding post 6 can connect RST terminal and motor connection UVW terminal for client's power supply, and the input and output line is respectively from connecting the earth terminal separate connection here.Control circuit power panel 7 has the input of interchange (380 volts of 3 cross streams), and direct current (up to 600 volts of direct currents) is arranged, and control circuit power panel 7 is connected with Aluminium Radiator 2 bronze medal posts.Housing 8 adopts the ABS fire proofing to make, and the heat radiation window is opened in the side, and the heat that printed circuit board (PCB) produces in time spreads out by this heat radiation window, can increase coefficient of safety when the client uses.I/O loam cake led state shows, the panel simple operations resets/stops and move key, and 4 directionkeys of parameter setting are easily finished whole frequency converter and operated.Front shroud is connected with housing 8 buckles, pins the both sides recess gently and also can pick up, and makes things convenient for the power supply terminal wiring.Control circuit board and power panel 7 are set in housing 8, mainly are provided with control loop parts such as digital signal processor and demonstration and input panel circuit on the control circuit board, belong to the light current parts.On power panel 7, be provided with rectification circuit, filter circuit, inverter circuit, power supply output, switching power circuit and current sensor etc.Foregoing circuit is connected to control circuit by lead.The panel communications connectors can directly connect long-range, control terminal 9: binding post adopts 17, can freely select wiring and selection for the client.3 of Multifunctional relay 10 lead-out terminals.2 of RS485 communication terminal.
As shown in Figure 4:
Power supply input circuit mainly is a power input terminal, and piezo-resistance is formed.Input 220V/380V AC power wherein contains piezo-resistance, is used for protecting the internal circuit of frequency converter, prevents surge voltage damage frequency converter.1, the power supply input circuit output connects the input of rectification circuit, and rectification circuit mainly is that diode is formed, and alternating current becomes direct current through after the diode, passes through after the electrochemical capacitor filtering again, converts constant DC to.2, the output of rectification circuit is connected to the input of filter circuit: filter circuit mainly is that electrochemical capacitor is formed; From the power supply input circuit input current, use electrolytic capacitor filtering, make the electric current dress change constant DC into.3, the filter circuit output is connected to the input of inverter circuit: inverter circuit mainly is that power inverter and voltage stabilizing circuit are formed; The input of inverter circuit is to come from filter circuit; The main effect of inverter circuit is that direct current is transformed into AC power, and the signal of inverter is controlled by microprocessor.4, the output of inverter circuit is connected to the input of power output circuit: power output circuit mainly is that power output terminal is formed; Power output circuit be from the inverter circuit output current to power output circuit, power output circuit electric current output current is to motor.5, filter circuit connects switching power circuit: obtain power supply behind filter circuit; Effect is to provide suitable power supply for microprocessor.Its output signal is that the 5V power supply signal is to microprocessor.6, the output of microprocessor connects inverter circuit and demonstration and control input panel, and the microprocessor input connects current sensor, control panel and Switching Power Supply.Microprocessor is used for computing and processing signals.7, power output circuit connects current sensor: current sensor detects size of current from power output circuit, carries out conversion of signals, feeds back to the central signal processor again.8, demonstration and control input panel: the control input panel mainly is state and the control of conversion device that shows frequency converter.Panel is from the microprocessor input signal, and output signal is to microprocessor again.
As shown in Figure 5: the utility model switching power circuit (module) components and parts annexation is as follows:
1, circuit input end P1 connects resistance R 76, and resistance R 76 connects resistance R 75, and resistance R 75 is connected to transformer TF1 primary side, and capacitor C 51 is connected between R75 and the signal PDCN;
2. resistance R 55 is connected with the output of diode D14 later on after capacitor C 43 parallel connections with resistance R 81 series connection again, and the other end is connected to resistance R 75;
3. the input of diode D14 is connected to the drain electrode of field effect transistor Q7 and the primary side of transformer TF1; Voltage stabilizing didoe ZD2 is connected with source electrode with resistance R 65 grids that are parallel to later field effect transistor Q7 more in parallel;
4. resistance R 74, resistance R 73, and resistance R 56, resistance R 58, resistance R 82, an end is connected to R75 after resistance R 60 series connection, and the other end is connected to the collector electrode of triode Q8, and the emitter of triode Q8 is directly connected to signal PDCN.
5. are connected between the source electrode and PDCN of field effect transistor Q7 after resistance R 69 and resistance R 68 parallel connections;
6. the signal of field effect transistor Q7 connects resistance R 57, and resistance R 57 connects capacitor C 45, and capacitor C 45 is received on the transformer TF1;
7. the collector electrode of triode Q8 is connected to the grid of field effect transistor Q7, and the emitter of triode Q8 is connected on the signal PDCN,
8. a side of photoelectrical coupler PC7 output signal is connected to the base stage of capacitor C 49 and triode Q8, and the opposite side of capacitor C 49 is connected on the transformer TF1, and also the source electrode with field effect transistor Q7 is connected;
9. diode D16 connects with resistance R 59, and an end is connected to transformer TF1, and an end is connected to the output of photoelectrical coupler PC7, is connected on the outlet side two ends of photoelectrical coupler PC7 after voltage stabilizing didoe ZD1 and resistance R 63 series connection;
10. the outlet side pin of the TF1 of transformer is through diode D11 output signal P24; Capacitor C 38 is connected in parallel between P24 and the signal CM;
11. the secondary side output signal of transformer TF1 process diode D12 is to amplifier U5 output signal P5; Capacitor C 39, capacitor C 40 and capacitor C 41, capacitor C 42 are connected in parallel between P5 and the signal CM;
12. transformer TF1 output side joint diode D15, diode D15 opposite side connects signal N15, and capacitor C 44 is connected in parallel on diode D13 and the signal DCN;
13. transformer TF1 output signal connects diode D15 to output signal P15, the P15 signal connects resistance R 61 and resistance R 62 to signal DCN, and capacitor C 46 is connected between signal P15 and the signal DCN;
14. transformer TF1 output signal is connected to inductance L 2 through diode D17 shunt capacitance C47, inductance L 2 other ends output 3.3V (P3.3);
15. capacitor C 48 is connected in parallel between signal P3.3 and the signal DCN.Signal feedback is that P15 connects resistance R 64 to photoelectrical coupler PC7 input;
16. resistance R 66 is connected on signal P3.3 and the comparator REF1, resistance R 67 is connected the input of comparator REF1, opposite side is connected on the resistance R 66, and capacitor C 50 is connected on the resistance R 66, and the other end is connected the output of comparator REF1 and the input of photoelectrical coupler PC7;
17. the input of comparator REF1 is connected with signal DCN.

Claims (5)

1. intelligent type universal frequency converter, employing is provided with control circuit board and power panel in housing, control circuit is located on control circuit board and the power panel, and control circuit comprises rectification circuit and inverter circuit, it is characterized in that the power supply input circuit output connects the input of rectification circuit;
Rectification circuit output end connects the filter circuit input, and described filter circuit makes current conversion become direct current;
The filter circuit output is connected with inverter circuit and switching power circuit input, and described inverter circuit is transformed into AC power to direct current, and the signal of inverter is controlled by microprocessor;
The inverter circuit output connects the input of power output circuit, described power output circuit be from the inverter circuit output current to power output circuit, power output circuit electric current output current is to motor;
Switching power circuit connects microprocessor, obtains power supply from filter circuit, and the out-put supply signal is to microprocessor;
The output of microprocessor is connected with the control input panel with demonstration with inverter circuit.The microprocessor input connects current sensor, control panel and Switching Power Supply.Microprocessor is used for computing and processing signals;
Described demonstration and input panel are state and the control of conversion devices that shows frequency converter, and panel is from the microprocessor input signal, and output signal is to microprocessor again.
Power output circuit connects current sensor, and described current sensor detects size of current from power output circuit, carries out conversion of signals, feeds back to the central signal processor again.
2. intelligent type universal frequency converter according to claim 1 is characterized in that described housing (8) is connected with radiator (2) buckle.
3. intelligent type universal frequency converter according to claim 1 is characterized in that described housing (8) is connected with cooling fan (3) buckle.
4. intelligent type universal frequency converter according to claim 1 is characterized in that described housing (8) is connected with the front shroud buckle.
5. intelligent type universal frequency converter according to claim 1 is characterized in that described switching power circuit components and parts annexation is as follows:
(1). circuit input end (P1) connects resistance (R76), and resistance (R76) connects resistance (R75), and resistance (R75) is connected to transformer (TF1) primary side, electric capacity (C51) be connected on (R75) and (PDCN) between;
(2). resistance (R55) afterwards with after electric capacity (C43) parallel connection is connected with the output of diode (D14) with resistance (R81) series connection again, and the other end is connected to resistance (R75);
(3). the input of diode (D14) connects the drain electrode of field effect transistor (Q7) and the primary side of transformer (TF1); The grid that is parallel to field effect transistor (Q7) after voltage stabilizing didoe (ZD2) and resistance (R65) parallel connection again is connected with source electrode;
(4). resistance (R74), resistance (R73), resistance (R56), resistance (R58), resistance (R82), resistance (R60) series connection back one end connects (R75), the other end connects the collector electrode of triode (Q8), and the emitter of triode (Q8) is directly connected to signal (PDCN);
(5). connect between the source electrode and signal (PDCN) of field effect transistor (Q7) after resistance (R69) and resistance (R68) are in parallel;
(6). the signal of field effect transistor (Q7) connects resistance (R57), and resistance (R57) connects electric capacity (C45), and electric capacity (C45) is received on the transformer (TF1);
(7). the collector electrode of triode (Q8) is connected to the grid of field effect transistor (Q7), and the emitter of triode (Q8) is connected on the signal (PDCN);
(8). a side of photoelectrical coupler (PC7) output signal is connected to the base stage of electric capacity (C49) and triode (Q8), and the opposite side of electric capacity (C49) is connected on the transformer (TF1), and also the source electrode with field effect transistor (Q7) is connected;
(9). diode (D16) is connected with resistance (R59), and an end is connected to transformer (TF1), and an end is connected to the output of photoelectrical coupler (PC7), is connected on the outlet side two ends of photoelectrical coupler (PC7) after voltage stabilizing didoe (ZD1) and resistance (R63) series connection;
(10). the outlet side pin of (TF1) of transformer is through diode (D11) output signal (P24); Electric capacity (C38) is connected in parallel between (P24) and the signal (CM);
(11). the secondary side output signal of transformer (TF1) arrives amplifier (U5) output signal (P5) through diode (D12); Electric capacity (C39), electric capacity (C40) and electric capacity (C41), electric capacity (C42) are connected in parallel between (P5) and the signal (CM);
(12). transformer (TF1) output side joint diode (D15), diode (D15) opposite side connects signal (N15), and electric capacity (C44) is connected in parallel on diode (D13) and the signal (DCN);
(13). transformer (TF1) output signal connects diode (D15) to output signal (P15), and (P15) signal connection resistance (R61) and resistance (R62) are to signal (DCN), and electric capacity (C46) is connected between signal (P15) and the signal (DCN);
(14). transformer (TF1) output signal is connected to inductance (L2), inductance (L2) other end output signal (P3.3) through diode (D17) shunt capacitance (C47);
(15). electric capacity (C48) is connected in parallel between signal (P3.3) and the signal (DCN), and signal feedback is that (P15) connects resistance (R64) to photoelectrical coupler (PC7) input;
(16). resistance (R66) is connected on signal (P3.3) and the comparator (REF1), resistance (R67) is connected the input of comparator (REF1), opposite side is connected on the resistance (R66), electric capacity (C50) is connected on the resistance (R66), and the other end is connected the output of comparator (REF1) and the input of photoelectrical coupler (PC7);
(17). the input of comparator (REF1) is connected with signal (DCN).
CNU2007200368663U 2007-05-09 2007-05-09 Intelligent general frequency converter Expired - Lifetime CN201044422Y (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102780404A (en) * 2012-07-27 2012-11-14 徐州锐普变频技术有限公司 Automatic motor current regulation frequency converter
CN103036488A (en) * 2012-11-19 2013-04-10 腾达电动科技镇江有限公司 Digital driver of disc type motor
CN103248311A (en) * 2013-01-17 2013-08-14 福建睿能电子有限公司 Frequency conversion controller of motor
WO2015058538A1 (en) * 2013-10-22 2015-04-30 珠海格力电器股份有限公司 Power source circuit and air conditioning unit
CN105763122A (en) * 2011-03-28 2016-07-13 索尤若驱动有限及两合公司 Converter Assembly And Method For Operating Converter Assembly
CN106301143A (en) * 2016-08-12 2017-01-04 康力电梯股份有限公司 A kind of modularity frequency-changing control system
CN105034850B (en) * 2014-04-28 2017-07-18 丰田自动车株式会社 Vehicle
CN107572382A (en) * 2016-07-04 2018-01-12 (株)大山Inotec Include the crane of integral inverter plate
CN113253079A (en) * 2021-07-06 2021-08-13 广东电网有限责任公司中山供电局 Microcomputer type direct current system insulation monitoring test device and method

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105763122A (en) * 2011-03-28 2016-07-13 索尤若驱动有限及两合公司 Converter Assembly And Method For Operating Converter Assembly
CN105763122B (en) * 2011-03-28 2019-01-25 索尤若驱动有限及两合公司 Converter apparatus and method for running converter apparatus
CN102780404A (en) * 2012-07-27 2012-11-14 徐州锐普变频技术有限公司 Automatic motor current regulation frequency converter
CN103036488A (en) * 2012-11-19 2013-04-10 腾达电动科技镇江有限公司 Digital driver of disc type motor
CN103248311A (en) * 2013-01-17 2013-08-14 福建睿能电子有限公司 Frequency conversion controller of motor
CN103248311B (en) * 2013-01-17 2016-02-24 福建睿能科技股份有限公司 Frequency conversion controller of motor
WO2015058538A1 (en) * 2013-10-22 2015-04-30 珠海格力电器股份有限公司 Power source circuit and air conditioning unit
CN105034850B (en) * 2014-04-28 2017-07-18 丰田自动车株式会社 Vehicle
CN107572382A (en) * 2016-07-04 2018-01-12 (株)大山Inotec Include the crane of integral inverter plate
CN106301143A (en) * 2016-08-12 2017-01-04 康力电梯股份有限公司 A kind of modularity frequency-changing control system
CN113253079A (en) * 2021-07-06 2021-08-13 广东电网有限责任公司中山供电局 Microcomputer type direct current system insulation monitoring test device and method

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