CN102832798B - One powers on buffer control circuit and control method thereof - Google Patents
One powers on buffer control circuit and control method thereof Download PDFInfo
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- CN102832798B CN102832798B CN201210312337.7A CN201210312337A CN102832798B CN 102832798 B CN102832798 B CN 102832798B CN 201210312337 A CN201210312337 A CN 201210312337A CN 102832798 B CN102832798 B CN 102832798B
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Abstract
The embodiment of the invention discloses one to power on buffer control circuit and control method thereof, for controlling the buffer circuit that powers on.The buffer control circuit that powers in the embodiment of the present invention comprises: the buffer circuit that powers on, digital signal processor; Wherein, the buffer circuit that powers on comprises major loop contactor, snubber contact device, buffer resistance; Buffer resistance is in parallel with major loop contactor after connecting with snubber contact device; Digital signal processor is all connected with the control coil of major loop contactor and the control coil of snubber contact device, to control adhesive or the disconnection of major loop contactor and snubber contact device, the buffer circuit that makes to power on is controlled, improves fail safe and the reliability of the buffer circuit that powers on.
Description
Technical field
The present invention relates to frequency conversion equipment field, particularly relate to one and to power on buffer circuit and control method thereof.
Background technology
Frequency conversion equipment (Variable-frequency Drive; VFD) be application converter technique and microelectric technique; the electric control appliance of alternating current motor is controlled by changing machine operation supply frequency mode; supply voltage required for it can be provided according to the actual needs of motor; and then reach energy-conservation, the object of speed governing; in addition; frequency conversion equipment also has a lot of defencive functions; as overcurrent, overvoltage, overload protection etc.; along with improving constantly of industrial automatization, frequency converter obtains application widely.
All the buffer circuit that powers on is comprised in frequency conversion equipment in prior art, and frequency conversion equipment generally adopts power on buffering scheme or DC side of common AC to power on buffering scheme, but, use above two kinds of buffer circuits that power on to carry out the primary demand that upper electric control can only meet frequency conversion equipment, still there is following problem:
1) buffer circuit that powers on is uncontrollable, and after frequency conversion equipment input powers on, the buffer circuit that powers on is by automatic operation, but this circuit cannot automation be integrated in systems in which, and there is certain potential safety hazard.
2) in frequency conversion equipment power up, if misoperation appears in major loop contactor control signal, big current will be had and flow through rectification circuit and electrochemical capacitor, the easy overcurrent damage of rectification circuit of frequency conversion equipment, also there is larger rush of current to electrochemical capacitor, affect device lifetime.
3) in frequency conversion equipment running, if occur, major loop contactor disconnects, the situation that successive load disconnects not yet, the resistance powered in buffer circuit can be caused to damage, and cause other secondary failures.
Therefore, the buffer circuit that powers in frequency conversion equipment of the prior art is uncontrollable, fail safe and reliability low, and easily cause the device failure in frequency conversion equipment.
Summary of the invention
In view of this, embodiments providing one and to power on buffer control circuit and control method thereof, for controlling the power up of frequency conversion equipment, there is reliability high, the advantages such as fail safe is good.
The buffer control circuit that powers in the embodiment of the present invention comprises:
Power on buffer circuit, digital signal processor;
Wherein, the buffer circuit that powers on described in comprises major loop contactor, snubber contact device, buffer resistance;
Described buffer resistance is in parallel with described major loop contactor after connecting with described snubber contact device;
Described digital signal processor is all connected with the control coil of described major loop contactor and the control coil of described snubber contact device, to control adhesive or the disconnection of described major loop contactor and described snubber contact device.
Preferably, described snubber contact device normally opened contact seals in the control coil of described major loop contactor, and described major loop contactor normally-closed contact seals in the control coil of described snubber contact device.
Preferably, the described buffer circuit that powers on all is connected with rectification circuit with described digital signal processor, and described in the voltage output end of buffer circuit that powers on be connected with the voltage input end of rectification circuit, described digital signal processor controls adhesive or the disconnection of described major loop contactor and described snubber contact device according to the busbar voltage of the voltage output end of described rectification circuit.
Preferably, described in the power on voltage input end of buffer circuit be connected with the voltage output end of major loop air switch, and the voltage output end of described major loop air switch is also connected with the input of described digital signal processor.
The control method of the buffer control circuit that powers in the embodiment of the present invention comprises:
After frequency conversion equipment powers on, described digital signal processor sends adhesive control signal to control the adhesive of described snubber contact device to described snubber contact device, and the buffer circuit that powers on described in making is started working;
At the end of preset first time period, described digital signal processor obtains the first busbar voltage on described rectification circuit output end bus;
Judge whether described first busbar voltage is more than or equal to the first preset numerical value;
If described first busbar voltage is more than or equal to described the first preset numerical value, then described digital signal processor sends adhesive control signal to described major loop contactor;
Detect and judge the whether adhesive of described major loop contactor;
If the adhesive of described major loop contactor detected, then described digital signal processor sends to described snubber contact device and disconnects control signal to disconnect described snubber contact device, and terminates to power on buffering.
Preferably, described digital signal processor sends adhesive control signal also to comprise before the step controlling the adhesive of described snubber contact device to described snubber contact device:
Whether the three phase mains RST of voltage input end of buffer circuit of powering on described in judgement is normal;
If described in the power on three phase mains RST of voltage input end of buffer circuit normal, then perform described digital signal processor and send adhesive control signal to control the step of described snubber contact device adhesive to described snubber contact device.
Preferably, described control method also comprises:
If described first busbar voltage is less than described the first preset numerical value, then described digital signal processor sends to described snubber contact device and disconnects control signal to disconnect described snubber contact device.
Preferably, described digital signal processor also comprised send the step of adhesive control signal to described major loop contactor before:
At the end of the second preset time period, described digital signal processor obtains the second busbar voltage on described rectification circuit output end bus;
Judge whether described second busbar voltage is more than or equal to preset second value;
If described second busbar voltage is more than or equal to described preset second value, then perform described digital signal processor sends step from adhesive control signal to described major loop contactor.
Preferably, described control method also comprises:
If described second busbar voltage is less than described preset second value, then described digital signal processor sends to described snubber contact device and disconnects control signal to disconnect described snubber contact device.
Preferably, described control method also comprises:
If the non-adhesive of described major loop contactor detected, then described digital signal processor sends to described snubber contact device and disconnects control signal to disconnect described snubber contact device.
As can be seen from the above technical solutions, the embodiment of the present invention has the following advantages:
Power on buffer control circuit by digital signal processor (Digital Signal Processor, DSP) adhesive or the disconnection of major loop contactor and the snubber contact device powered in buffer circuit is controlled, wherein, the buffer resistance powered in buffer circuit is in parallel with major loop contactor after connecting with snubber contact device, by adding snubber contact device powering in buffer circuit, and controlled by digital signal processor, the buffer circuit that makes to power on is controlled, improve fail safe and the reliability of the buffer circuit that powers on, the fault such as rectification circuit overcurrent damage and buffer resistance damage can be avoided.
Accompanying drawing explanation
Fig. 1 is frequency conversion equipment part circuit structure schematic diagram in the embodiment of the present invention;
Fig. 2 is the structural representation of buffer circuit of powering in the embodiment of the present invention;
Fig. 3 is the schematic diagram of control method of buffer control circuit of powering in the embodiment of the present invention;
Fig. 4 is another schematic diagram of control method of buffer control circuit of powering in the embodiment of the present invention.
Embodiment
Embodiments provide one to power on buffer control circuit and control method thereof, for controlling the buffering course that powers on of frequency conversion equipment, have reliability high, the advantages such as fail safe is good, effectively can avoid the fault such as rectification circuit overcurrent damage and buffer resistance damage.
Refer to Fig. 1 and Fig. 2, Fig. 1 is frequency conversion equipment part circuit structure schematic diagram in the embodiment of the present invention, and Fig. 2 is the structural representation of buffer circuit of powering in the embodiment of the present invention.
As shown in Figure 1, in the embodiment of the present invention, frequency conversion equipment partial circuit comprises: the buffer circuit 101 that powers on, digital signal processor (Digital Signal Processor, DSP) 102, major loop air switch 106 and rectification circuit 107.As shown in Figure 2, the buffer circuit 101 that powers on specifically also comprises major loop contactor 103, snubber contact device 104 and buffer resistance 105.
In embodiments of the present invention, the buffer control circuit that powers on specifically comprises: the buffer circuit 101 that powers on, digital signal processor 102.
Wherein, powering in buffer circuit 101, buffer resistance 105 is in parallel with major loop contactor 103 after connecting with snubber contact device 104; In addition, digital signal processor 102 is all connected with the control coil of major loop contactor 103 and the control coil of snubber contact device 104, to control adhesive or the disconnection of major loop contactor 103 and snubber contact device 104, to complete the power up of frequency conversion equipment.
In embodiments of the present invention, snubber contact device 104 normally opened contact seals in the control coil of major loop contactor 103, and major loop contactor 103 normally-closed contact seals in the control coil of snubber contact device 104.
In embodiments of the present invention, the voltage input end of buffer circuit 101 that powers on is connected with the voltage output end of the major loop air switch 106 of frequency conversion equipment, and when major loop air switch 106 closes, frequency conversion equipment powers on, when major loop air switch 106 disconnects, frequency conversion equipment power-off.After frequency conversion equipment powers on, digital signal processor 102 can when the three-phase voltage RST electric voltage frequency of voltage output end major loop air switch 106 being detected be normal, adhesive control signal is sent to snubber contact device 104, the buffer circuit 101 that makes to power on is started working, and can effectively avoid powering the system failure caused to frequency conversion equipment in the abnormal situation of input voltage.
In embodiments of the present invention, the buffer circuit 101 that powers on all is connected with the rectification circuit 107 of frequency conversion equipment with digital signal processor 102, the voltage output end of buffer circuit 101 that powers on is connected with the voltage input end of the rectification circuit 107 of frequency conversion equipment, and digital signal processor 102 can control adhesive or the disconnection of major loop contactor 103 and snubber contact device 104 according to the busbar voltage of rectification circuit 107 voltage output end detected.
In embodiments of the present invention, also can holding time parameter in digital signal processor 102, power at frequency conversion equipment, and after buffer circuit 101 work that powers on, digital signal processor 102 is from acquisition time parameter himself memory, and the busbar voltage of the voltage output end of rectification circuit 107 is detected according to this time parameter, and adhesive or the disconnection of major loop contactor 103 and snubber contact device 104 is controlled according to this busbar voltage, the overtime buffer failure of frequency conversion equipment effectively can be detected, such as, if time parameter is 3 minutes, then after the buffer circuit 101 that powers on works 3 minutes, obtain the busbar voltage of rectification circuit 107 output, and control to power on buffer circuit 101 according to this busbar voltage.
In embodiments of the present invention, powering in buffer circuit 101 power up, after digital signal processor 102 obtains the busbar voltage of rectification circuit 107 voltage output end according to time parameter, when this busbar voltage is more than or equal to preset magnitude of voltage, digital signal processor 102 will send adhesive control signal to major loop contactor 103, and disconnection control signal is sent to snubber contact device 104 after determining major loop contactor 103 adhesive, to disconnect snubber contact device 104, the damage that rectification circuit 107 overcurrent causes effectively can be avoided; In addition, major loop contactor 103 wrong diagnosis in frequency conversion equipment running also can be avoided to open the damage of the buffer resistance 105 caused and other secondary failures of initiation, effectively raise fail safe and the reliability of frequency conversion equipment, avoid the damage of rectification circuit 107 overcurrent and buffer resistance 105.
The buffer control circuit that powers on of middle description embodiment illustrated in fig. 1 for a better understanding of the present invention, refers to Fig. 3, is the embodiment of the control method of the buffer control circuit that powers in the embodiment of the present invention, comprises:
301, after frequency conversion equipment powers on, digital signal processor 102 sends adhesive control signal to control snubber contact device 104 adhesive to snubber contact device 104, and the buffer circuit 101 that makes to power on is started working;
Power in buffer control circuit at frequency conversion equipment shown in Fig. 1, after major loop air switch 106 is closed, frequency conversion equipment powers on, digital signal processor 102 sends adhesive control signal to snubber contact device 104, snubber contact device 104 control coil is made to obtain electric, snubber contact device 104 adhesive and its normally opened contact will close, and the buffer circuit 101 that powers on is started working.
302, at the end of preset first time period, digital signal processor 102 obtains the first busbar voltage on rectification circuit 107 output bus;
In embodiments of the present invention, time parameter is saved in the memory of digital signal processor 102, this time parameter is preset first time period, after digital signal processor 102 obtains preset first time period from memory, by according to this preset first time period timing, at the end of the first time period that this is preset, the first busbar voltage that digital signal processor 102 will obtain on the bus of rectification circuit 107 voltage output end.
303, judge whether the first busbar voltage is more than or equal to the first preset numerical value, if so, then perform step 304, if not, then perform step 307.
304, digital signal processor 102 sends adhesive control signal to major loop contactor 103;
In embodiments of the present invention, digital signal processor 102 is after acquisition first busbar voltage, to judge whether this first busbar voltage is more than or equal to the first preset numerical value, if this first busbar voltage is more than or equal to this first preset numerical value, then digital signal processor 102 will send adhesive control signal to major loop contactor 103, wherein, the first preset numerical value can be the specified busbar voltage of preset percentage.Such as: the first preset numerical value can be the specified busbar voltage of 50%.
305, detect and judge major loop contactor 103 whether adhesive, if so, then performing step 306, if not, then perform step 307.
306, digital signal processor 102 sends to snubber contact device 104 and disconnects control signal to disconnect snubber contact device 104, and terminates to power on buffering;
In embodiments of the present invention, after major loop contactor 103 receives adhesive control signal, the control coil of major loop contactor 103 obtains electric its normally-closed contact that makes and disconnects, major loop contactor 103 adhesive, and detection is judged major loop contactor 103 whether adhesive by digital signal processor 102, if digital signal processor 102 detects major loop contactor 103 adhesive, to send to snubber contact device 104 and disconnect control signal to disconnect snubber contact device 104, and terminate to power on buffering, make frequency conversion equipment enter normal Standby state.
307, digital signal processor 102 sends to snubber contact device 104 and disconnects control signal to disconnect snubber contact device 104.
In embodiments of the present invention, if digital signal processor 102 detects the non-adhesive of major loop contactor 103, then illustrate that the buffer circuit 101 that powers on may break down, digital signal processor 102 will send disconnection control signal to snubber contact device 104, to disconnect buffer control unit 104, in addition, also will send fault alerting signal, to remind staff, trouble shooting be carried out to frequency conversion equipment.
In embodiments of the present invention, the buffer control circuit that powers on is controlled adhesive or the disconnection of major loop the contactor 103 and snubber contact device 104 powered in buffer circuit 101 by digital signal processor 102, the buffer circuit 101 that makes to power on is controlled, improve fail safe and the reliability of the buffer circuit 101 that powers on, the fault such as rectification circuit 107 overcurrent damage and buffer resistance 105 damage can be avoided.
The control method of the buffer control circuit that powers on for a better understanding of the present invention in embodiment, refers to Fig. 4, is another embodiment of the control method of the buffer control circuit that powers in the embodiment of the present invention, comprises:
401, after frequency conversion equipment powers on, whether the three phase mains RST of voltage input end of the buffer circuit 101 that judges to power on is normal;
At the buffer control circuit and power in buffer circuit 101 of powering on of frequency conversion equipment shown in Fig. 1 and Fig. 2, after major loop air switch 106 is closed, frequency conversion equipment powers on, digital signal processor 102 will detect major loop air switch 106 voltage output end, namely power on the three-phase voltage RST of voltage input end of buffer circuit 101, judge that this three phase mains RST is whether normal, wherein, " normally " refers to that the amplitude of the voltage of three phase mains RST and frequency meet the requirement of the operating voltage of frequency conversion equipment.
402, when the three phase mains RST of the voltage input end of the buffer circuit 101 that powers on is normal, digital signal processor 102 sends adhesive control signal to control snubber contact device 104 adhesive to snubber contact device 104, and the buffer circuit 101 that makes to power on is started working;
In embodiments of the present invention, when digital signal processor 102 detects that the three phase mains RST of the voltage input end of the buffer circuit 101 that powers on is normal, digital signal processor 102 will send adhesive control signal to snubber contact device 104, snubber contact device 104 control coil is made to obtain electric, snubber contact device 104 normally opened contact is closed is in attracting state, and the buffer circuit 101 that powers on is started working.
It should be noted that, in embodiments of the present invention, if digital signal processor 102 detects that RST signal is abnormal, then illustrate that RST fault may appear in frequency conversion equipment, will send fault cues information or signal, and carry out trouble shooting to remind operating personnel.Such as: by sending warning warning voice, or control the flicker of alarm lamp to remind operating personnel to carry out trouble shooting.
403, at the end of preset first time period, digital signal processor 102 obtains the first busbar voltage on rectification circuit 107 output bus;
In embodiments of the present invention, digital signal processor 102 can obtain preset first time period from its memory, and according to this preset first time period timing, when this preset first time period, the first busbar voltage that digital signal processor 102 will obtain on rectification circuit 107 voltage output end bus.Such as, if preset first time period is 1 minute, then digital signal processor 102 is when snubber contact device 104 adhesive terminates for 1 minute, obtains the first busbar voltage on rectification circuit 107 voltage output end bus.
404, judge whether the first busbar voltage is more than or equal to the first preset numerical value, if so, then perform step 405, if not, then perform 410;
405, at the end of the second preset time period, digital signal processor 102 obtains the second busbar voltage on rectification circuit 107 output bus;
406, judge whether the second busbar voltage is more than or equal to preset second value, if so, then perform step 407, if not, then perform 410;
407, adhesive control signal is sent to major loop contactor 103;
In embodiments of the present invention, whether digital signal processor 102 can break down according to the size determination frequency conversion equipment of busbar voltage, concrete, digital signal processor 102 judges whether the first busbar voltage is more than or equal to the first preset numerical value, such as: judge whether this first busbar voltage is more than or equal to the specified busbar voltage of 50%.In embodiments of the present invention, if this first busbar voltage is more than or equal to the first preset numerical value, at the end of the second preset time period, the second busbar voltage that digital signal processor 102 will obtain on rectification circuit 107 output bus, and continue to judge whether this second busbar voltage is more than or equal to preset second value, such as: judge whether this second busbar voltage is more than or equal to the specified busbar voltage of 90%.
If the second busbar voltage is more than or equal to preset second value, then digital signal processor 102 will send adhesive control signal to major loop contactor 103.
It should be noted that, in embodiments of the present invention, " first " " second " only for distinguishing two different busbar voltages and two different numerical value, and is not used in the restriction to technical scheme itself.And " preset first time period " " the second preset time period " " the first preset numerical value " " preset second value " in the embodiment of the present invention all can be arranged according to actual conditions by operating personnel.
It should be noted that, in embodiments of the present invention, digital signal processor 102 to two not busbar voltage in the same time carried out detecting and judging, to determine that frequency conversion equipment can normally work, in actual applications, operating personnel can arrange digital signal processor 102 according to specific circumstances and carry out the detection of busbar voltage and the number of times of judgement, better to detect the fault of frequency conversion equipment, guarantee that frequency conversion equipment can normally run.
408, detect and judge major loop contactor 103 whether adhesive, if so, then performing step 409, if not, then perform step 410;
409, digital signal processor 102 sends to snubber contact device 104 and disconnects control signal to disconnect snubber contact device 104, and terminates to power on buffering;
In embodiments of the present invention, after major loop contactor 103 receives the adhesive control signal of digital signal processor 102 transmission, adhesive operation will be carried out, and digital signal processor 102 will whether adhesive detects to major loop contactor 103, if digital signal processor 102 detects major loop contactor 103 adhesive, to send to snubber contact device 104 and disconnect control signal to disconnect snubber contact device 104, and terminate to power on buffering, frequency conversion equipment enters normal Standby state.
410, digital signal processor 102 sends to snubber contact device 104 and disconnects control signal to disconnect snubber contact device 104.
In embodiments of the present invention, when the first busbar voltage is less than the first preset numerical value, frequency conversion equipment may occur cushioning time out fault, digital signal processor 102 will send to snubber contact device 104 and disconnect control signal to disconnect snubber contact device 104, in addition, digital signal processor 102 also will send prompting message or signal to operating personnel, to remind operating personnel, trouble shooting is carried out to frequency conversion equipment, such as: when the first busbar voltage is less than the first preset numerical value, trouble light on frequency conversion equipment starts flicker, or sends warning of reporting to the police.
In addition, in embodiments of the present invention, when the first busbar voltage is more than or equal to the first preset numerical value, when but the second busbar voltage when preset second time period is less than preset second value, frequency conversion equipment also may occur cushioning time out fault, digital signal processor 102 will send to snubber contact device 104 and disconnect control signal to disconnect snubber contact device 104, in addition, digital signal processor 102 also will send prompting message or signal to operating personnel, carry out trouble shooting to remind operating personnel to frequency conversion equipment.
In embodiments of the present invention, if digital signal processor 102 detects the non-adhesive of major loop contactor 103, then illustrate that the buffer circuit 101 that powers on may break down, digital signal processor 102 sends to snubber contact device 104 and disconnects control signal to disconnect snubber contact device 104, in addition, digital signal processor 102 also will send prompting message or signal to operating personnel, carry out trouble shooting to remind operating personnel to frequency conversion equipment.
In embodiments of the present invention, digital signal processor 102 is being determined to send adhesive control signal to snubber contact device 104 in the normal situation of three phase mains RST, the control coil of snubber contact device 104 is obtained electric, snubber contact device 104 adhesive, the buffer circuit 101 that powers on is started working, can effectively avoid the abnormal frequency conversion equipment caused of three phase mains RST to power to break down, improve fail safe and the reliability of frequency conversion equipment, and can control the buffer circuit 101 that powers on due to digital signal processor 102, the buffer control circuit that makes to power on can carry out the system integration, powering in buffering course, digital signal processor 102 can respectively through preset first time period and the second preset time period to the detection of busbar voltage and judgement, determine whether frequency conversion equipment occurs cushioning time out fault, better to carry out fault detect, reduce the loss that frequency conversion equipment fault is brought, in addition, when the second busbar voltage is more than or equal to preset second value, digital signal processor 102 will send adhesive control signal to major loop contactor 103, the control coil of major loop contactor 103 is obtained electric, busbar voltage is set up rapidly, and after major loop contactor 103 adhesive being detected, send to snubber contact device 104 and disconnect control signal, make frequency conversion equipment normal Standby, detected by adhesive and the mode of electrical interlocks, greatly can improve the reliability and safety of frequency conversion equipment.
It should be noted that, for aforesaid each embodiment of the method, in order to simple description, therefore it is all expressed as a series of combination of actions, but those skilled in the art should know, the present invention is not by the restriction of described sequence of movement, because according to the present invention, some step can adopt other orders or carry out simultaneously.Secondly, those skilled in the art also should know, the embodiment described in specification all belongs to preferred embodiment, and involved action and module might not be that the present invention is necessary.
In the above-described embodiments, the description of each embodiment is all emphasized particularly on different fields, in certain embodiment, there is no the part described in detail, can see the associated description of other embodiments.
Those skilled in the art can be well understood to, and for convenience and simplicity of description, the specific works process of the method for foregoing description, with reference to the corresponding process in aforementioned means embodiment, can not repeat them here.In several embodiments that the application provides, should be understood that disclosed apparatus and method can realize by another way, apparatus and method embodiment described above is only schematic.
Above power on buffer control circuit and control method thereof of one provided by the present invention is described in detail, for one of ordinary skill in the art, according to the thought of the embodiment of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (8)
1. power on the control method of buffer control circuit, it is characterized in that, described in the buffer control circuit that powers on comprise:
Power on buffer circuit, digital signal processor, described in the buffer circuit that powers on all be connected with rectification circuit with described digital signal processor;
Wherein, the buffer circuit that powers on described in comprises major loop contactor, snubber contact device, buffer resistance;
Described buffer resistance is in parallel with described major loop contactor after connecting with described snubber contact device;
Described digital signal processor is all connected with the control coil of described major loop contactor and the control coil of described snubber contact device, to control adhesive or the disconnection of described major loop contactor and described snubber contact device;
Described control method comprises:
After frequency conversion equipment powers on, described digital signal processor sends adhesive control signal to control the adhesive of described snubber contact device to described snubber contact device, and the buffer circuit that powers on described in making is started working;
At the end of preset first time period, described digital signal processor obtains the first busbar voltage on described rectification circuit output end bus;
Judge whether described first busbar voltage is more than or equal to the first preset numerical value;
If described first busbar voltage is more than or equal to described the first preset numerical value, then, at the end of the second preset time period, described digital signal processor obtains the second busbar voltage on described rectification circuit output end bus;
Judge whether described second busbar voltage is more than or equal to preset second value;
If described second busbar voltage is more than or equal to described preset second value, then described digital signal processor sends adhesive control signal to described major loop contactor;
Detect and judge the whether adhesive of described major loop contactor;
If the adhesive of described major loop contactor detected, then described digital signal processor sends to described snubber contact device and disconnects control signal to disconnect described snubber contact device, and terminates to power on buffering.
2. control method according to claim 1, is characterized in that, described snubber contact device normally opened contact seals in the control coil of described major loop contactor, and described major loop contactor normally-closed contact seals in the control coil of described snubber contact device.
3. control method according to claim 1, it is characterized in that, the described buffer circuit that powers on all is connected with rectification circuit with described digital signal processor, and described in the voltage output end of buffer circuit that powers on be connected with the voltage input end of rectification circuit, described digital signal processor controls adhesive or the disconnection of described major loop contactor and described snubber contact device according to the busbar voltage of the voltage output end of described rectification circuit.
4. control method according to claim 3, it is characterized in that, the voltage input end of the described buffer circuit that powers on is connected with the voltage output end of major loop air switch, and the voltage output end of described major loop air switch is also connected with the input of described digital signal processor.
5. control method according to any one of claim 1 to 4, is characterized in that, described digital signal processor sends adhesive control signal also to comprise before the step controlling the adhesive of described snubber contact device to described snubber contact device:
Whether the three phase mains RST of voltage input end of buffer circuit of powering on described in judgement is normal;
If described in the power on three phase mains RST of voltage input end of buffer circuit normal, then perform described digital signal processor and send adhesive control signal to control the step of described snubber contact device adhesive to described snubber contact device.
6. control method according to any one of claim 1 to 4, is characterized in that, described control method also comprises:
If described first busbar voltage is less than described the first preset numerical value, then described digital signal processor sends to described snubber contact device and disconnects control signal to disconnect described snubber contact device.
7. control method according to any one of claim 1 to 4, is characterized in that, described control method also comprises:
If described second busbar voltage is less than described preset second value, then described digital signal processor sends to described snubber contact device and disconnects control signal to disconnect described snubber contact device.
8. control method according to any one of claim 1 to 4, is characterized in that, described control method also comprises:
If the non-adhesive of described major loop contactor detected, then described digital signal processor sends to described snubber contact device and disconnects control signal to disconnect described snubber contact device.
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| CN201210312337.7A CN102832798B (en) | 2012-08-29 | 2012-08-29 | One powers on buffer control circuit and control method thereof |
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| CN103457451B (en) * | 2013-08-22 | 2016-12-28 | 深圳市英威腾电气股份有限公司 | A kind of high-voltage frequency converter low voltage electrifying control circuit and control method thereof |
| CN108199572B (en) * | 2017-12-25 | 2021-03-30 | 苏州英威腾电力电子有限公司 | Frequency converter and power-off protection system thereof |
| CN108923388A (en) * | 2018-08-17 | 2018-11-30 | 东菱技术有限公司 | A kind of fault detection circuit powering on buffer cell and method |
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| DE102009037723B4 (en) * | 2009-08-17 | 2016-08-11 | Siemens Aktiengesellschaft | Method for discharging a link capacitor of a voltage source inverter |
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