CN103715970A - Frequency converter and motor drive circuit thereof - Google Patents
Frequency converter and motor drive circuit thereof Download PDFInfo
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- CN103715970A CN103715970A CN201410028847.0A CN201410028847A CN103715970A CN 103715970 A CN103715970 A CN 103715970A CN 201410028847 A CN201410028847 A CN 201410028847A CN 103715970 A CN103715970 A CN 103715970A
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Abstract
The invention discloses a motor drive circuit of a frequency converter, which is applied to a frequency converter. The motor drive circuit comprises a rectifier module, a soft start module, a filter module, a control module and an inverter module which are sequentially connected. The motor drive circuit of the frequency converter further comprises a normally-open controllable switch additionally arranged between the filter module and the inverter module of the frequency converter, when the frequency converter is not electrified, the filter module is disconnected with the inverter module; when a right connection manner is that an RST (Radiosensitivity Testing) is electrified, the power supply is used for charging the filter capacitor module through the rectifier module; when the control circuit is started, the control module outputs a control signal to control the normally-open controllable switch to be closed, and the frequency converter can normally output; and when a power supply lead is connected to the output end of the frequency converter by mistake, a closed loop can not be formed through charging, the control part is always kept at a power losing state because the filter capacitor can not be charged, namely, a safety state, and thus smashing caused by wrong connection of the frequency converter can be effectively avoided, and the fault type loss is prevented. The invention further discloses a frequency converter.
Description
Technical field
The present invention relates to motor Driving technique field, in particular, relate to a kind of frequency converter motor-drive circuit and frequency converter.
Background technology
At present, frequency converter is mainly used in motor driver, and it mainly realizes AC-DC-AC conversion.Frequency converter comprises rectification module, soft-start module, filtration module, the main modular such as control module and inversion module, input ac power is direct current by rectification module rectification, from filtration module, voltage after rectification is become to level and smooth direct voltage, through control module, control inversion module again direct current is converted to alternating current, current peak to filter capacitor when soft-start module Main Function is restriction throwing electricity, thereby with protection rectification module, avoiding larger charging current damages, but when frequency converter is applied at the scene, may be by power line misconnection to inversion module output, when throwing electricity, power supply also can be realized rectification by the diode in inversion module, filtration module is charged, but owing to there is no the current-limiting protection of soft starting circuit at inversion module end, thereby can cause inversion module to bear larger charging current damages, even if inversion module does not damage, now move frequency converter and also may cause the peril of short circuit aircraft bombing.
Therefore, reversal connection for frequency converter needs special standby attention, a kind of frequency converter motor-drive circuit and frequency converter are provided, avoiding causing inversion module to bear the peril that larger charging current causes the damage of inversion module or causes short circuit aircraft bombing when mis-wired, is those skilled in the art's technical problems urgently to be resolved hurrily.
Summary of the invention
In view of this; the invention provides a kind of frequency converter motor-drive circuit and frequency converter; while applying at the scene due to frequency converter in prior art to overcome; may be by power line misconnection to inversion module output; when throwing electricity, power supply also can be realized rectification by the diode in inversion module; but owing to there is no the current-limiting protection of soft starting circuit at inversion module end, thereby can cause inversion module to bear the problem that the peril of short circuit aircraft bombing was damaged or caused to larger charging current.
For achieving the above object, the invention provides following technical scheme:
A frequency converter motor-drive circuit, is applied to frequency converter, and described circuit comprises rectification module, soft-start module, filtration module, control module and the inversion module connecting successively, also comprises: open type gate-controlled switch, wherein,
The input of described rectification module is connected with power end, and the first end of described rectification module is connected with the first end of described soft start;
The second end of described soft start is connected with the first end of described filtration module;
The second end of described rectification module is connected with the second end of described filtration module;
Described control module is in parallel with described filtration module;
The first end of described inversion module is connected with the first end of described filtration module, and the second end of described inversion module is connected with the second end of described filtration module;
The first end of described open type gate-controlled switch is connected with the first end of described filtration module, and the second end of described open type gate-controlled switch is connected with the first end of described inversion module;
The 3rd end of described inversion module is output;
The power supply of described power end charges to described filtration module by described rectification module, after described filtration module has charged, starts the control circuit of described control module, and it is closed that described control module output control signal is controlled described open type gate-controlled switch.
Wherein, described rectification module comprises: three groups of diode groups in parallel in the same way, every group is connected in series two diodes, respectively the input as described rectification module at described diode group extracting power supply cord.
Wherein, described soft-start module comprises: a resistance and the open type gate-controlled switch being connected in parallel with described resistance.
Wherein, described filtration module comprises filter capacitor, the first end of the just very described filtration module of described filter capacitor, the second end that negative pole is described filtration module.
The invention also discloses a kind of frequency converter, comprise frequency converter motor-drive circuit described above.
Known via above-mentioned technical scheme, compared with prior art, the invention discloses a kind of frequency converter motor-drive circuit, be applied to frequency converter, it comprises the rectification module connecting successively, soft-start module, filtration module, control module and inversion module, this frequency converter motor-drive circuit also comprises: open type gate-controlled switch, this invention adds an open type gate-controlled switch between filtration module and inversion module, when frequency converter is not thrown electricity, filtration module and inversion module are connected to disconnection, when correct wiring is RST throwing electricity, power supply charges to filter capacitor module by rectification module, after control circuit starts up, it is closed that control module output control signal is controlled open type gate-controlled switch, frequency converter can normally be exported, when mistake is received inverter output terminal by power line, throw electricity and cannot form closed-loop path, control section keeps power failure state, i.e. safe condition because filter capacitor cannot charge always, can effectively avoid frequency converter to cause aircraft bombing because of mis-wired, avoid the loss of fault type.The invention also discloses a kind of frequency converter, can effectively avoid frequency converter to cause aircraft bombing because of mis-wired, avoid the loss of fault type.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skills, do not paying under the prerequisite of creative work, other accompanying drawing can also be provided according to the accompanying drawing providing.
Fig. 1 is the main structure schematic diagram of the disclosed a kind of frequency converter motor-drive circuit of the embodiment of the present invention;
Fig. 2 is the corresponding sequential chart of the correct wiring of the disclosed frequency converter motor-drive circuit of the embodiment of the present invention;
Fig. 3 is the corresponding sequential chart of the mis-wired of the disclosed frequency converter motor-drive circuit of the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The invention discloses a kind of frequency converter motor-drive circuit, be applied to frequency converter, it comprises the rectification module connecting successively, soft-start module, filtration module, control module and inversion module, this frequency converter motor-drive circuit also comprises: open type gate-controlled switch, this invention adds an open type gate-controlled switch between the filtration module of frequency converter and inversion module, when frequency converter is not thrown electricity, filtration module and inversion module are connected to disconnection, when correct wiring is RST throwing electricity, power supply charges to filter capacitor module by rectification module, after control circuit starts up, it is closed that control module output control signal is controlled open type gate-controlled switch, frequency converter can normally be exported, when mistake is received inverter output terminal by power line, throw electricity and cannot form closed-loop path, control section keeps power failure state, i.e. safe condition because filter capacitor cannot charge always, can effectively avoid frequency converter to cause aircraft bombing because of mis-wired, avoid the loss of fault type.The invention also discloses a kind of frequency converter, can effectively avoid frequency converter to cause aircraft bombing because of mis-wired, avoid the loss of fault type.
Referring to accompanying drawing 1, is the main structure schematic diagram of the disclosed a kind of frequency converter motor-drive circuit of the embodiment of the present invention.The embodiment of the invention discloses a kind of frequency converter motor-drive circuit, be applied to frequency converter, described circuit comprises rectification module 1, soft-start module 2, filtration module 3, control module 4 and the inversion module 5 connecting successively, this frequency converter motor-drive circuit also comprises: open type gate-controlled switch 6, wherein, the input of described rectification module 1 is connected with power end, and the first end of described rectification module 1 is connected with the first end of described soft-start module 2; The second end of described soft-start module 2 is connected with the first end of described filtration module 3; The second end of described rectification module 1 is connected with the second end of described filtration module 3; Described control module 4 is in parallel with described filtration module 3; The first end of described inversion module 5 is connected with the first end of described filtration module 3, and the second end of described inversion module 5 is connected with the second end of described filtration module 3; The first end of described open type gate-controlled switch 6 is connected with the first end of described filtration module 3, and the second end of described open type gate-controlled switch 6 is connected with the first end of described inversion module 5; The 3rd end of described inversion module 5 is output; The power supply of described power end charges by 1 pair of described filtration module 3 of described rectification module, after described filtration module 3 has charged, start the control circuit of described control module 4, described control module 4 output control signals are controlled described open type gate-controlled switch 6 closures.
This invention adds an open type gate-controlled switch between the filtration module of frequency converter and inversion module, when frequency converter is not thrown electricity, filtration module and inversion module are connected to disconnection, when correct wiring is RST throwing electricity, power supply charges to filter capacitor module by rectification module, after control circuit starts up, it is closed that control module output control signal is controlled open type gate-controlled switch, and frequency converter can normally be exported; When mistake is received inverter output terminal by power line, throw electricity and cannot form closed-loop path, control section keeps power failure state, i.e. safe condition because filter capacitor cannot charge always, can effectively avoid frequency converter to cause aircraft bombing because of mis-wired, avoid the loss of fault type.
Concrete, as shown in Figure 1, described rectification module comprises: three groups of diode groups in parallel in the same way, every group is connected in series two diodes, respectively the input as described rectification module at described diode group extracting power supply cord.Rectification module, is also high-frequency switch module, and effect is that alternating current is converted to direct current, and it can be divided into three phase rectifier module and two-phase rectification module, and what in the present invention, mention is three phase rectifier module.
Concrete, as shown in Figure 1, described soft-start module comprises: a resistance and the open type gate-controlled switch being connected in parallel with described resistance.Current peak to filter capacitor when electricity is thrown in the Main Function restriction of soft-start module, to protect rectification module.
Described filtration module comprises filter capacitor, the first end of the just very described filtration module of described filter capacitor, the second end that negative pole is described filtration module.
The present invention arranges an open type gate-controlled switch between filtration module and inversion module, when wiring is correct, RST in Fig. 1 throws electricity, power supply charges to filter capacitor module by rectification module, after control circuit starts up, frequency converter normally starts and to control open type gate-controlled switch K1 closed, do not affect normal output, concrete, refer to accompanying drawing 2, the corresponding sequential chart of correct wiring of the disclosed frequency converter motor-drive circuit of the embodiment of the present invention, as shown in Figure 2, when power supply throwing electric switch is power-off, filter capacitor voltage is zero, open type gate-controlled switch is in off-state, output enable is not exportable, when power supply is thrown electric switch for throwing electricity, filter capacitor charges, after charging completes, again through after a while, open type gate-controlled switch is in closure state, output enable is exportable, frequency converter can normally be exported.
When wiring error, the UVW in Fig. 1 throws electricity, if there is no K1 gate-controlled switch, while throwing electricity, power supply charges by the diode pair filter capacitor in inversion module, owing to there is no soft start resistance current limliting, therefore the peak current that charges is larger, can cause inversion module to damage.If inversion module does not damage, now move frequency converter and also can cause short circuit aircraft bombing, but when K1 open type gate-controlled switch is concatenated between filter capacitor and inversion module, because open type gate-controlled switch is in off-state, cannot form closed-loop path, avoid inversion module to cause damage, allow Frequency Converter Control part in dead electricity safe condition simultaneously, concrete, refer to accompanying drawing 3, the corresponding sequential chart of mis-wired for the disclosed frequency converter motor-drive circuit of the embodiment of the present invention, no matter power supply is thrown electric switch is still thrown electricity in power-off, because filter capacitor is in electroless state, open type gate-controlled switch remains open always, output enable is always not exportable.
This invention adds an open type gate-controlled switch between filtration module and inversion module, when frequency converter is not thrown electricity, filtration module and inversion module are connected to disconnection, when correct wiring is RST throwing electricity, power supply charges to filter capacitor module by rectification module, after control circuit starts up, it is closed that control module output control signal is controlled open type gate-controlled switch, and frequency converter can normally be exported; When mistake is received inverter output terminal by power line, throw electricity and cannot form closed-loop path, control section keeps power failure state, i.e. safe condition because filter capacitor cannot charge always, can effectively avoid frequency converter to cause aircraft bombing because of mis-wired, avoid the loss of fault type.
On the basis of the disclosed embodiment of the invention described above, the invention also discloses a kind of frequency converter, specifically comprise frequency converter motor-drive circuit described above, can effectively avoid frequency converter to cause aircraft bombing because of mis-wired, avoid the loss of fault type.Concrete, described frequency converter motor-drive circuit is as shown in Figure 1.
In sum: the invention discloses a kind of frequency converter motor-drive circuit, be applied to frequency converter, it comprises the rectification module connecting successively, soft-start module, filtration module, control module and inversion module, this frequency converter motor-drive circuit also comprises: open type gate-controlled switch, this invention adds an open type gate-controlled switch between filtration module and inversion module, when frequency converter is not thrown electricity, filtration module and inversion module are connected to disconnection, when correct wiring is RST throwing electricity, power supply charges to filter capacitor module by rectification module, after control circuit starts up, it is closed that control module output control signal is controlled open type gate-controlled switch, frequency converter can normally be exported, when mistake is received inverter output terminal by power line, throw electricity and cannot form closed-loop path, control section keeps power failure state, i.e. safe condition because filter capacitor cannot charge always, can effectively avoid frequency converter to cause aircraft bombing because of mis-wired, avoid the loss of fault type.The invention also discloses a kind of frequency converter, an open type gate-controlled switch is set between filtration module and inversion module, when wiring is correct, frequency converter normally starts and controls open type gate-controlled switch closure, does not affect normal output; When wiring error, because open type gate-controlled switch is in off-state, cannot form closed-loop path, avoid inversion module to cause damage, allow Frequency Converter Control part in dead electricity safe condition simultaneously.
Above-mentioned explanation to the disclosed embodiments, makes professional and technical personnel in the field can realize or use the present invention.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (5)
1. a frequency converter motor-drive circuit, is applied to frequency converter, and described circuit comprises rectification module, soft-start module, filtration module, control module and the inversion module connecting successively, it is characterized in that, also comprises: open type gate-controlled switch, wherein,
The input of described rectification module is connected with power end, and the first end of described rectification module is connected with the first end of described soft start;
The second end of described soft start is connected with the first end of described filtration module;
The second end of described rectification module is connected with the second end of described filtration module;
Described control module is in parallel with described filtration module;
The first end of described inversion module is connected with the first end of described filtration module, and the second end of described inversion module is connected with the second end of described filtration module;
The first end of described open type gate-controlled switch is connected with the first end of described filtration module, and the second end of described open type gate-controlled switch is connected with the first end of described inversion module;
The 3rd end of described inversion module is output;
The power supply of described power end charges to described filtration module by described rectification module, after described filtration module has charged, starts the control circuit of described control module, and it is closed that described control module output control signal is controlled described open type gate-controlled switch.
2. frequency converter motor-drive circuit according to claim 1, it is characterized in that, described rectification module comprises: three groups of diode groups in parallel in the same way, every group is connected in series two diodes, respectively the input as described rectification module at described diode group extracting power supply cord.
3. frequency converter motor-drive circuit according to claim 1, is characterized in that, described soft-start module comprises: a resistance and the open type gate-controlled switch being connected in parallel with described resistance.
4. frequency converter motor-drive circuit according to claim 1, is characterized in that, described filtration module comprises filter capacitor, the first end of the just very described filtration module of described filter capacitor, the second end that negative pole is described filtration module.
5. a frequency converter, is characterized in that, comprises the frequency converter motor-drive circuit described in any one in the claims 1-4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410028847.0A CN103715970B (en) | 2014-01-22 | 2014-01-22 | A kind of frequency converter motor-drive circuit and frequency converter |
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| CN201410028847.0A CN103715970B (en) | 2014-01-22 | 2014-01-22 | A kind of frequency converter motor-drive circuit and frequency converter |
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| CN103715970A true CN103715970A (en) | 2014-04-09 |
| CN103715970B CN103715970B (en) | 2016-05-25 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104734530A (en) * | 2013-12-20 | 2015-06-24 | 珠海格力电器股份有限公司 | Frequency converter, variable frequency air conditioner and air conditioning system |
| CN105186845A (en) * | 2015-09-29 | 2015-12-23 | 海信（山东）空调有限公司 | Circuit and method for controlling IPM (intelligent power module) |
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| CN201838994U (en) * | 2010-06-18 | 2011-05-18 | 北京茨浮电气有限公司 | Input and output reverse protection device of frequency converter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104734530A (en) * | 2013-12-20 | 2015-06-24 | 珠海格力电器股份有限公司 | Frequency converter, variable frequency air conditioner and air conditioning system |
| CN104734530B (en) * | 2013-12-20 | 2018-04-17 | 珠海格力电器股份有限公司 | Frequency converter, convertible frequency air-conditioner and air-conditioning system |
| CN105186845A (en) * | 2015-09-29 | 2015-12-23 | 海信（山东）空调有限公司 | Circuit and method for controlling IPM (intelligent power module) |
| CN105186845B (en) * | 2015-09-29 | 2018-07-03 | 海信（山东）空调有限公司 | A kind of circuit and method for controlling IPM |
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| CN103715970B (en) | 2016-05-25 |
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