CN204030946U - Soft start system of frequency converter and frequency conversion air conditioner applying same - Google Patents
Soft start system of frequency converter and frequency conversion air conditioner applying same Download PDFInfo
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- CN204030946U CN204030946U CN201420470081.7U CN201420470081U CN204030946U CN 204030946 U CN204030946 U CN 204030946U CN 201420470081 U CN201420470081 U CN 201420470081U CN 204030946 U CN204030946 U CN 204030946U
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- 238000006243 chemical reaction Methods 0.000 title abstract 2
- 230000010363 phase shift Effects 0.000 claims abstract description 36
- 238000001514 detection method Methods 0.000 claims abstract description 21
- 238000004378 air conditioning Methods 0.000 claims description 19
- 201000006549 dyspepsia Diseases 0.000 claims description 13
- 238000005070 sampling Methods 0.000 abstract 4
- 230000003116 impacting effect Effects 0.000 description 6
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- 238000005516 engineering process Methods 0.000 description 1
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Abstract
The application provides a soft start system of a frequency converter and a frequency conversion air conditioner using the same, comprising a three-phase bridge full-wave rectifying circuit with an upper bridge arm being a three-phase bridge half-wave controllable circuit, a zero detection circuit with an input end connected with a voltage input end of the three-phase bridge full-wave rectifying circuit for outputting a zero signal of an input voltage of the zero detection circuit, a sampling circuit connected with the output end of the three-phase bridge full-wave rectification circuit and used for detecting the output voltage and outputting a sampling signal, an arithmetic circuit respectively connected with the zero point detection circuit and the sampling circuit and used for outputting a phase-shift signal according to the sampling signal and the zero point signal and through a phase-shift signal output end arranged on the arithmetic circuit, a drive circuit with the input end connected with the phase-shift signal output end and provided with a drive signal output end used for outputting a drive signal obtained according to the phase-shift signal, the driving signal output end is connected with the control end of an upper bridge arm of the three-phase bridge full-wave rectification circuit. Impact on the load of the frequency converter can be avoided.
Description
Technical field
The application relates to air-conditioning technical field, more particularly, relates to a kind of Soft Starting System of frequency converter and applies its transducer air conditioning.
Background technology
Frequency converter in transducer air conditioning directly loads on DC bus after utilizing rectifying device civil power to be carried out rectification, boosting is very fast, easily larger impact is caused to the inverter of frequency converter, the output voltage of inverter also directly can be raised to normal working voltage from zero simultaneously, also larger impact can be caused to the motor of transducer air conditioning, as everyone knows, for the motor of transducer air conditioning, larger surge voltage can have a strong impact on its useful life.Therefore need a kind of Soft Starting System badly, to avoid the impact caused the load of frequency converter, thus extend its useful life.
Utility model content
In view of this, the application provides a kind of Soft Starting System of frequency converter and applies its transducer air conditioning, to avoid impacting the load of frequency converter, to extend its useful life.
To achieve these goals, the existing scheme proposed is as follows:
A Soft Starting System for transducer air conditioning, is applied in the frequency converter of described transducer air conditioning, comprises:
Three-phase bridge full-wave rectifying circuit; The upper brachium pontis of described three-phase bridge full-wave rectifying circuit is three-phase bridge half-wave controlable electric current, lower brachium pontis is three-phase bridge half-wave not control circuit;
The zero-detection circuit that input is connected with the voltage input end of described three-phase bridge full-wave rectifying circuit, it is provided with the zero signal output of the zero signal of the input voltage for exporting described three-phase bridge full-wave rectifying circuit;
Be connected with the output of described three-phase bridge full-wave rectifying circuit, for detecting the sample circuit of the output voltage of described three-phase bridge full-wave rectifying circuit, it is provided with the sampled signal output for exporting sampled signal;
Be connected with described zero signal output, sampled signal output respectively, for exporting the computing circuit of phase shift signal according to described sampled signal and described zero signal, it is provided with the phase shift signal output for exporting described phase shift signal;
Input is connected with described phase shift signal output, for the drive circuit according to described phase shift signal output drive signal, described drive circuit is provided with the drive singal output for exporting described drive singal;
Described drive singal output is connected with the control end of described upper brachium pontis.
Preferably, described zero-detection circuit comprises:
Be connected with the voltage input end of described three-phase bridge full-wave rectifying circuit, for the identical three-pass DINSAR amplifying circuit of the structure of the phase voltage detecting the input voltage of described three-phase bridge full-wave rectifying circuit, differential amplifier circuit described in each road is provided with the phase voltage output exporting described phase voltage;
Three tunnels identical with the structure that described phase voltage output is connected, with difference eliminate indigestion circuit, for obtaining the line voltage of described input voltage according to described phase voltage, are provided with the line voltage output end for exporting described line voltage with difference eliminate indigestion circuit described in each road;
Be connected with described line voltage output end, for exporting the comparison circuit of described zero signal according to described line voltage, its output is as described zero signal output.
Preferably, described differential amplifier circuit comprises:
First operational amplifier, its positive input ground connection;
The first resistance that one end is connected with the reverse input end of described first operational amplifier;
The second operational amplifier that positive input is connected with the other end of described first resistance, its reverse input end is as the input of described zero-detection circuit;
Be connected to the second resistance between the reverse input end of described first operational amplifier and its output;
The 3rd resistance that one end is connected with the output of described first operational amplifier;
The 3rd operational amplifier that positive input is connected with the other end of described 3rd resistance;
Be connected to the 4th resistance between the positive input of described 3rd operational amplifier and its output;
Be connected to the 5th resistance between the normal phase input end of described second operational amplifier and its output;
The 6th resistance that one end is connected with the output of described second operational amplifier;
The other end of described 6th resistance is connected with the reverse input end of described 3rd operational amplifier;
The 7th resistance that one end is connected with the reverse input end of described 3rd operational amplifier;
The other end of described 7th resistance is connected with reference voltage input terminal;
The output of described 3rd operational amplifier is as described phase voltage output.
Preferably, described and poor eliminate indigestion circuit comprises:
8th resistance, its one end is for receiving the phase voltage of a phase of described differential amplifier output;
The four-operational amplifier that reverse input end is connected with the other end of described 8th resistance;
The 9th resistance be connected with the positive input of described four-operational amplifier, its other end is for receiving the phase voltage of another phase of described differential amplifier output;
Be connected to the tenth resistance between the reverse input end of described four-operational amplifier and output thereof;
The output of described four-operational amplifier is as described line voltage output end;
Preferably, described comparison circuit comprises:
The 11 resistance that one end is connected with the positive input of described four-operational amplifier;
The other end input as the reference voltage of described 11 resistance.
Preferably, described computing circuit comprises:
Add circuit, its positive input is for connecting setting output voltage input, and its reverse input end is connected with described sampled signal output;
The integrating circuit that input is connected with the output of described add circuit;
The computing unit be connected with the output of described integrating circuit, described zero signal output respectively;
The output of described computing unit is as described phase shift signal output.
Preferably, described three-phase bridge half-wave not control circuit comprise:
The uncontrollable rectifier diode that three positive poles are connected with the negative pole of described three-phase bridge full-wave rectifying circuit output respectively;
The negative pole of described three uncontrollable rectifier diodes is as described voltage input end.
Preferably, described three-phase bridge half-wave controlable electric current comprises:
The controlled rectification diode that three negative poles are connected with the positive pole of the output of described three-phase bridge full-wave rectifying circuit respectively;
The positive pole of described three controlled rectification diodes is as described voltage input end.
Preferably, the output of described three-phase bridge full-wave rectification diode positive pole be connected with many groups of electric capacity of connecting between two between negative pole.
A kind of transducer air conditioning, is provided with Soft Starting System as above.
As can be seen from technique scheme, this application provides a kind of Soft Starting System of transducer air conditioning, comprise the three-phase bridge full-wave rectifying circuit that brachium pontis is three-phase bridge half-wave controlable electric current, input is connected with the voltage input end of this three-phase bridge full-wave rectifying circuit, be provided with the zero-detection circuit of the zero signal output of the zero signal for exporting its input voltage, be connected with the output of three-phase bridge full-wave rectifying circuit, for detecting its output voltage and being provided with the sample circuit of the sampled signal output for exporting sampled signal, respectively with described zero signal output, sampled signal output is connected, for exporting the computing circuit of phase shift signal according to described sampled signal and described zero signal and by the phase shift signal output of setting on it, input is connected with phase shift signal output, be provided with the drive circuit of the drive singal output for exporting the drive singal obtained according to phase shift signal, this drive singal output is connected with the control end of the upper brachium pontis of three-phase bridge full-wave rectifying circuit.Because the application is by detecting the zero signal of input voltage, then the detection signal of the output end voltage of three-phase bridge full-wave rectifying circuit and zero signal is utilized to obtain phase shift signal, phase shift signal is utilized to export the drive singal of the angle of flow of the upper brachium pontis controlling three-phase bridge full-wave rectifying circuit, thus the voltage that can control its output boosts lentamente, thus can impacting inverter circuit be avoided, inverter circuit also just can be avoided impacting the load of frequency converter, thus can extend its useful life.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the application, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The structure chart of the Soft Starting System of a kind of transducer air conditioning that Fig. 1 provides for the embodiment of the present application;
The structure chart of a kind of three-phase full wave rectifier circuit that Fig. 2 provides for the embodiment of the present application;
The structure chart of the another kind of Soft Starting System that Fig. 3 provides for the embodiment of the present application;
The structure chart of a kind of differential amplifier circuit that Fig. 4 provides for the embodiment of the present application;
The structure chart of a kind of and poor eliminate indigestion circuit and comparison circuit that Fig. 5 provides for the embodiment of the present application;
The structure chart of a kind of computing circuit that Fig. 6 provides for the embodiment of the present application.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, be clearly and completely described the technical scheme in the embodiment of the present application, obviously, described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the application's protection.
Embodiment one
The structure chart of the Soft Starting System of a kind of transducer air conditioning that Fig. 1 provides for the embodiment of the present application.
As shown in Figure 1, the System for Soft-starting that the present embodiment provides comprises three-phase bridge full-wave rectifying circuit 10, zero-detection circuit 20, sample circuit 30, computing circuit 40 and drive circuit 50.
The upper brachium pontis of three-phase bridge full-wave rectifying circuit 10 is three-phase bridge half-wave controlable electric current; Lower brachium pontis is three-phase bridge half-wave not control circuit, as shown in Figure 2.Wherein, three-phase bridge half-wave controlable electric current comprises the controlled rectification diode 11 that three negative poles couple together, and the negative pole coupled together is as the positive pole of the output of this three-phase bridge full-wave rectifying circuit; Three bridge bridge-type half-waves not control circuit comprise the uncontrollable rectifier diode 12 that three positive poles are connected together, and the positive pole coupled together is as the negative pole of the output of this three-phase bridge full-wave rectifying circuit.The tie point of upper brachium pontis and lower brachium pontis is as the voltage input end 14 inputting three-phase alternating current.The output of this three-phase bridge full-wave rectifying circuit 10 positive pole be connected with the many groups of electric capacity of connecting between two 15 between negative pole as its storage capacitor.
The input of zero-detection circuit 20 is connected with the voltage input end of three-phase bridge full-wave rectifying circuit 10, for detecting the input voltage of voltage input end, obtain the detection signal at zero point of this input voltage, and export detection signal at this by its zero signal output at zero point.
Sample circuit 30 is connected with the output of this three-phase bridge rectifier circuit 10, for detecting the output voltage of this three-phase bridge rectification filter circuit 10, and is exported the sampled signal of this output voltage by the sampled signal output that it is arranged.
Computing circuit 40 is connected with the zero signal output of zero-detection circuit 20, the sampled signal output of sample circuit 30 respectively, the sampled signal that the zero signal exported according to zero-detection circuit 10 and sample circuit 30 export exports phase shift signal, is provided with the phase shift signal output for exporting this phase shift signal.
Drive circuit 50 is connected with the phase shift signal output of computing circuit 40, for generating the drive singal of the upper brachium pontis for controlling three-phase bridge full-wave rectifying circuit 10 according to phase shift signal, and exporting this drive singal by the drive singal output that it is arranged, this drive singal output is connected with the control end of the upper brachium pontis of three-phase bridge full-wave rectifying circuit 10 respectively.
Power on beginning in this Soft Starting System, in control, brachium pontis carries out phase shift by 180 degree, then the angle of phase shift is reduced gradually, finally control at 0 degree, thus the output voltage control of three-phase bridge full-wave rectifying circuit 10 is kept stable in the level of 2.45 times of input voltages, specifically by its output voltage control at 538 volts.
As can be seen from technique scheme, present embodiments provide a kind of floppy disk system of transducer air conditioning, comprise the three-phase bridge full-wave rectifying circuit that brachium pontis is three-phase bridge half-wave controlable electric current, input is connected with the voltage input end of this three-phase bridge full-wave rectifying circuit, be provided with the zero-detection circuit of the zero signal output of the zero signal for exporting its input voltage, be connected with the output of three-phase bridge full-wave rectifying circuit, for detecting its output voltage and being provided with the sample circuit of the sampled signal output for exporting sampled signal, respectively with described zero signal output, sampled signal output is connected, for exporting the computing circuit of phase shift signal according to described sampled signal and described zero signal and by the phase shift signal output of setting on it, input is connected with phase shift signal output, be provided with the drive circuit of the drive singal output for exporting the drive singal obtained according to phase shift signal, this drive singal output is connected with the control end of the upper brachium pontis of three-phase bridge full-wave rectifying circuit.Because the application is by detecting the zero signal of input voltage, then the detection signal of the output end voltage of three-phase bridge full-wave rectifying circuit and zero signal is utilized to obtain movable signal, phase shift signal is utilized to export the drive singal of the angle of flow of the upper brachium pontis controlling three-phase bridge full-wave rectifying circuit, thus the voltage that can control its output boosts lentamente, thus can impacting inverter circuit be avoided, inverter circuit also just can be avoided impacting the load of frequency converter, thus can extend its useful life.
Zero-detection circuit in the present embodiment comprises three-pass DINSAR amplifying circuit 21, three road and differs from eliminate indigestion circuit 22 and comparison circuit 23, as shown in Figure 3.
The structure of each road differential amplifier circuit of three-pass DINSAR amplifying circuit 21 is identical, the input of its each road differential amplifier circuit is connected mutually with one of the input voltage of three-phase bridge full-wave rectifying circuit 10, for detecting the phase voltage of this phase, each road is provided with phase voltage output.
The structure of differential amplifier circuit as shown in Figure 4, comprises the first operational amplifier U1, the second operational amplifier U2, the 3rd operational amplifier U3, the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 and the 7th resistance R7.
The positive input ground connection of the first operational amplifier U1; One end of first resistance R1 is connected with the reverse input end of the first operational amplifier U1, and the other end is connected with the positive input of the second operational amplifier U2; Wherein one being connected of the reverse input end of the second operational amplifier U2 and the input voltage of three-phase bridge full-wave rectifying circuit 10, namely the reverse input end of this second operational amplifier U2 is as the input of this zero-detection circuit.
Between the reverse input end that second resistance R2 is connected to the first operational amplifier U1 and its output; One end of 3rd resistance U3 is connected with the output of the first operational amplifier U1, and the other end is connected with the positive input of the 3rd operational amplifier U3; Between the positive input that 4th resistance R4 is connected to the 3rd operational amplifier U3 and its output; The output of the 3rd operational amplifier U3 is as the phase voltage output of this differential amplifier circuit.
Between the normal phase input end that 5th resistance R5 is connected to the second operational amplifier U2 and its output; One end of 6th resistance R6 is connected with the output of the second operational amplifier U2, the other end is connected with the reverse input end of the 3rd operational amplifier U3; One end of 7th resistance R7 is connected with the reverse input end of the 3rd operational amplifier U3, the other end and reference voltage input terminal V
refbe connected.
Three tunnels are identical with the structure of difference eliminate indigestion circuit with each road of difference eliminate indigestion circuit 22, and its each road is connected with the phase voltage output of differential amplifier circuit 21 with the input differing from eliminate indigestion circuit, to obtain and by its line voltage output end output line voltage.
As shown in Figure 5, its neutralization difference eliminate indigestion circuit comprises four-operational amplifier U4, the 8th resistance R8, the 9th resistance R9 and the tenth resistance R10 to the structure of each road and its corresponding comparison circuit of difference eliminate indigestion circuit, and comparison circuit comprises the 11 resistance R11.
One end of 8th resistance R8 is for receiving the phase voltage of a phase of differential amplifier circuit output, and its other end is connected with the reverse input end of four-operational amplifier U4; One end of 9th resistance R9 is connected with the positive input of four-operational amplifier U4, and its other end is for receiving the phase voltage of another phase of described differential amplifier output; Between the reverse input end that tenth resistance R10 is connected to four-operational amplifier U4 and output thereof; The output of four-operational amplifier U4 is as zero signal output;
One end of 11 resistance R11 is connected with the positive input of four-operational amplifier U4, and the other end is input V as the reference voltage
refto receive reference voltage, the reference voltage that this reference voltage receives with the reference voltage input terminal of differential amplifier circuit is consistent.
Computing circuit 40 in the present embodiment comprises add circuit 41, integrating circuit 42 and computing unit 43, as shown in Figure 6.Wherein, the positive input of add circuit 41 exports setting output voltage input U* for connecting
dc, its reverse input end is connected with the sampled signal output of sample circuit; The input of integrating circuit 42 is connected with the output of add circuit 41; Computing unit 43 is connected with the output of integrating circuit 42, zero signal output respectively.The output of this computing unit 43 as phase shift signal output, to export phase shift signal to drive circuit 50.
Embodiment two
Present embodiments provide a kind of transducer air conditioning, the frequency converter of this transducer air conditioning is provided with the soft starting circuit that above embodiment provides.
Due to the Soft Starting System that its frequency converter being provided with can slowly be boosted, therefore its output voltage is also responsively slowly boost, thus can avoid impacting its load, also just can extend its useful life.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the application.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from the spirit or scope of the application, can realize in other embodiments.Therefore, the application can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a Soft Starting System for transducer air conditioning, is applied in the frequency converter of described transducer air conditioning, it is characterized in that, comprising:
Three-phase bridge full-wave rectifying circuit; The upper brachium pontis of described three-phase bridge full-wave rectifying circuit is three-phase bridge half-wave controlable electric current, lower brachium pontis is three-phase bridge half-wave not control circuit;
The zero-detection circuit that input is connected with the voltage input end of described three-phase bridge full-wave rectifying circuit, it is provided with the zero signal output of the zero signal of the input voltage for exporting described three-phase bridge full-wave rectifying circuit;
Be connected with the output of described three-phase bridge full-wave rectifying circuit, for detecting the sample circuit of the output voltage of described three-phase bridge full-wave rectifying circuit, it is provided with the sampled signal output for exporting sampled signal;
Be connected with described zero signal output, sampled signal output respectively, for exporting the computing circuit of phase shift signal according to described sampled signal and described zero signal, it is provided with the phase shift signal output for exporting described phase shift signal;
Input is connected with described phase shift signal output, for the drive circuit according to described phase shift signal output drive signal, described drive circuit is provided with the drive singal output for exporting described drive singal;
Described drive singal output is connected with the control end of described three-phase bridge half-wave controlable electric current.
2. Soft Starting System as claimed in claim 1, it is characterized in that, described zero-detection circuit comprises:
Be connected with the voltage input end of described three-phase bridge full-wave rectifying circuit, for the identical three-pass DINSAR amplifying circuit of the structure of the phase voltage detecting the input voltage of described three-phase bridge full-wave rectifying circuit, differential amplifier circuit described in each road is provided with the phase voltage output exporting described phase voltage;
Three tunnels be connected with described phase voltage output, with difference eliminate indigestion circuit, for obtaining the line voltage of described input voltage according to described phase voltage, are provided with the line voltage output end for exporting described line voltage with difference eliminate indigestion circuit described in each road;
Be connected with described line voltage output end, for exporting the comparison circuit of described zero signal according to described line voltage, its output is as described zero signal output.
3. Soft Starting System as claimed in claim 2, it is characterized in that, described differential amplifier circuit comprises:
First operational amplifier, its positive input ground connection;
The first resistance that one end is connected with the reverse input end of described first operational amplifier;
The second operational amplifier that positive input is connected with the other end of described first resistance, its reverse input end is as the input of described zero-detection circuit;
Be connected to the second resistance between the reverse input end of described first operational amplifier and its output;
The 3rd resistance that one end is connected with the output of described first operational amplifier;
The 3rd operational amplifier that positive input is connected with the other end of described 3rd resistance;
Be connected to the 4th resistance between the positive input of described 3rd operational amplifier and its output;
Be connected to the 5th resistance between the normal phase input end of described second operational amplifier and its output;
The 6th resistance that one end is connected with the output of described second operational amplifier;
The other end of described 6th resistance is connected with the reverse input end of described 3rd operational amplifier;
The 7th resistance that one end is connected with the reverse input end of described 3rd operational amplifier;
The other end of described 7th resistance is connected with reference voltage input terminal;
The output of described 3rd operational amplifier is as described phase voltage output.
4. Soft Starting System as claimed in claim 2, it is characterized in that, described and poor eliminate indigestion circuit comprises:
8th resistance, its one end is for receiving the phase voltage of a phase of described differential amplifier output;
The four-operational amplifier that reverse input end is connected with the other end of described 8th resistance;
The 9th resistance be connected with the positive input of described four-operational amplifier, its other end is for receiving the phase voltage of another phase of described differential amplifier output;
Be connected to the tenth resistance between the reverse input end of described four-operational amplifier and output thereof;
The output of described four-operational amplifier is as described line voltage output end.
5. Soft Starting System as claimed in claim 4, it is characterized in that, described comparison circuit comprises:
The 11 resistance that one end is connected with the positive input of described four-operational amplifier;
The other end input as the reference voltage of described 11 resistance.
6. Soft Starting System as claimed in claim 1, it is characterized in that, described computing circuit comprises:
Add circuit, its positive input is for connecting setting output voltage input, and its reverse input end is connected with described sampled signal output;
The integrating circuit that input is connected with the output of described add circuit;
The computing unit be connected with the output of described integrating circuit, described zero signal output respectively;
The output of described computing unit is as described phase shift signal output.
7. the Soft Starting System as described in any one of claim 1 ~ 6, is characterized in that, described three-phase bridge half-wave not control circuit comprises:
The uncontrollable rectifier diode that three positive poles are connected with the negative pole of described three-phase bridge full-wave rectifying circuit output respectively;
The negative pole of described three uncontrollable rectifier diodes is as described voltage input end.
8. Soft Starting System as claimed in claim 7, it is characterized in that, described three-phase bridge half-wave controlable electric current comprises:
The controlled rectification diode that three negative poles are connected with the positive pole of the output of described three-phase bridge full-wave rectifying circuit respectively;
The positive pole of described three controlled rectification diodes is as described voltage input end.
9. Soft Starting System as claimed in claim 8, is characterized in that, the positive pole of the output of described three-phase bridge full-wave rectification diode be connected with many groups of electric capacity of connecting between two between negative pole.
10. a transducer air conditioning, is characterized in that, is provided with the Soft Starting System as described in any one of claim 1 ~ 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420470081.7U CN204030946U (en) | 2014-08-19 | 2014-08-19 | Soft start system of frequency converter and frequency conversion air conditioner applying same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420470081.7U CN204030946U (en) | 2014-08-19 | 2014-08-19 | Soft start system of frequency converter and frequency conversion air conditioner applying same |
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| CN204030946U true CN204030946U (en) | 2014-12-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104158395A (en) * | 2014-08-19 | 2014-11-19 | 珠海格力电器股份有限公司 | Soft start system and method of frequency converter and frequency conversion air conditioner applying same |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104158395A (en) * | 2014-08-19 | 2014-11-19 | 珠海格力电器股份有限公司 | Soft start system and method of frequency converter and frequency conversion air conditioner applying same |
| CN104158395B (en) * | 2014-08-19 | 2017-11-17 | 珠海格力电器股份有限公司 | Soft start system and method of frequency converter and frequency conversion air conditioner applying same |
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