CN105471280A - Device and method for protecting soft start failure of AC/DC/AC driver - Google Patents
Device and method for protecting soft start failure of AC/DC/AC driver Download PDFInfo
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- CN105471280A CN105471280A CN201511006966.7A CN201511006966A CN105471280A CN 105471280 A CN105471280 A CN 105471280A CN 201511006966 A CN201511006966 A CN 201511006966A CN 105471280 A CN105471280 A CN 105471280A
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- Prior art keywords
- driver
- soft start
- bus
- electric current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/48—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by combination of static with dynamic converters; by combination of dynamo-electric with other dynamic or static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1216—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for AC-AC converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a device and a method for protecting soft start failure of an AC/DC/AC driver. The device is applied to the AC/DC/AC driver at least comprising a soft start unit. The device comprises a current sensor, a normally-closed relay and a control device, wherein the current sensor is serially connected onto a bus of the AC/DC/AC driver, and is used for detecting current on the bus; two contacts of the normally-closed relay are respectively connected with the measuring terminal of the current sensor and the anode of a bus capacitor of the AC/DC/AC driver; the control device is connected with the current sensor and the control end of the normally-closed relay, and is used for generating a corresponding control signal according to the detected current of the bus on the current sensor; and when the soft start unit is in failure, the contacts at the two ends of the normally-closed relay are controlled to be opened. Correspondingly, the invention also discloses a method for protecting soft start failure of the AC/DC/AC driver. Through the implementation of the device and the method, the security of the AC/DC/AC driver during soft starting can be improved.
Description
Technical field
The present invention relates to AC-DC-AC field of drivers, particularly relate to a kind of devices and methods therefor protecting AC-DC-AC driver soft start to lose efficacy.
Background technology
-straight-friendship driver topological structure is handed over for voltage-type conventional at present, is generally: prime is the uncontrollable rectification unit of input, and intergrade is high power DC filter unit, and rear class is inversion output unit.Wherein, DC filtering unit is formed primarily of big capacity electrolyte capacitor, because electric capacity initial condition is equivalent to short circuit, when actuator voltage input side powers on, if be just added on electrochemical capacitor by the voltage after rectification without any process, the charging current that moment is very large can be caused, thus impact to driver commutating circuit, and cause electrochemical capacitor to decline useful life, and driver module is badly damaged.Therefore, usually adopt soft starting device and soft-start method to avoid above-mentioned fault to occur in the prior art, it can make the moment powered on, and the voltage at electrochemical capacitor two ends can slowly rise.
As shown in Figure 1, be a kind of structural representation with the AC-DC-AC driver of soft start structure of the prior art.Wherein, adopt current-limiting resistance to add relay (or contactor, controllable silicon) combination and realize soft start, wherein, a soft start unit 3 ' is adopted in the charge circuit of bus capacitor 2 ', it comprises current-limiting resistance R, and adopt switching device (such as relay, contactor or controllable silicon) in parallel with current-limiting resistance R, be a normally opened relay KT in figure.After powering on, normally opened relay KT is in closure state, and the electric current after rectification unit 1 ' rectification first flows through from current-limiting resistance R, is charged to bus capacitor 2 ' by current-limiting resistance R current limliting; When the direct voltage of bus capacitor 2 ' rises to set point, control normally opened relay KT by current-limiting resistance bypass by control device 4 ', enter normal operating conditions.Traditional AC-DC-AC driver generally all adopts this scheme.
As shown in Figure 2, be the structural representation that another kind of the prior art has the AC-DC-AC driver of soft start structure.Wherein soft start unit 3 ' adopts thyristor SCR to realize soft start.Wherein, when electricity starts on a drive, utilize half control characteristic of thyristor SCR, controlled the angle of flow of thyristor SCR by control device 4 ', make the voltage on bus capacitor 2 ' slowly increase by the rule of setting, thus realize soft start function.This scheme is applied on external advanced AC-DC-AC driver usually.
But inventor finds, above-mentioned first two soft start-up scheme also Shortcomings part, because any components and parts all exist integrity problem, under certain level of application, or be subject to the impact of environment, soft start unit 3 ' breaker in middle device and thyristor all can likely damage, the situation of most damage is embodied in that relay two terminal contacts constantly leaves, the anode of thyristor (A) and negative electrode (K) two terminal shortcircuit, thus cause soft starting device and disabler, impact to commutating circuit, the life-span of bus capacitor is declined, and the damage of driver module.
Therefore be necessary to design a kind of apparatus and method, to protect driver to prevent soft start to lose efficacy, avoid the appearance of above-mentioned fault.
Summary of the invention
In view of the deficiencies in the prior art, the embodiment of the present invention provides a kind of devices and methods therefor protecting AC-DC-AC driver soft start to lose efficacy, and when the soft start unit of AC-DC-AC driver breaks down, can protect AC-DC-AC driver.
In order to reach foregoing invention object, the embodiment of the present invention provides a kind of device protecting AC-DC-AC driver soft start to lose efficacy, and it is applied in the AC-DC-AC driver at least including a soft start unit, and described device comprises:
Be serially connected in the current sensor on AC-DC-AC driver bus, for detecting the electric current on described bus;
Normally closed relay, two contact passes the measuring junction of device and the bus capacitor of described AC-DC-AC driver respectively positive pole with described electric current is connected;
Control device, it is connected with the control end of described current sensor with described normally closed relay, for the electric current according to the bus that described current sensor detects, generates corresponding control signal, when soft start element failure, the contact controlling described normally closed relay two ends is opened.
Wherein, described control device comprises further:
Measuring unit, for when described AC-DC-AC driver powers on, analyzes according to the electric current that described current sensor detects, judges that the electric current on AC-DC-AC driver gradually changes or suddenlys change;
Condition adjudgement unit, when being sudden change for continuing the pre-determined number electric current measured on described AC-DC-AC driver at described measuring unit, judges that the soft start function of described AC-DC-AC driver lost efficacy;
Control unit, for described condition adjudgement unit judges to described AC-DC-AC driver soft start function lost efficacy time, when described AC-DC-AC driver powers on again, generate a control signal, send to the control end of described normally closed relay, the contact controlling described normally closed relay two ends is opened;
Alarm unit, for described condition adjudgement unit judges to described AC-DC-AC driver soft start function lost efficacy time, carry out alert process.
Wherein, described soft start unit comprises:
Current-limiting resistance, it is serially connected on described bus, and before being positioned at described current sensor;
Normally opened relay, its two contact is connected with the two ends of described current-limiting resistance respectively, and its control end is connected with described control device.
Wherein, described soft start unit comprises:
One thyristor, its anode A and negative electrode K are serially connected on described bus, and before being positioned at described current sensor; It controls pole G and is connected with described control device.
Correspondingly, the one side again of the embodiment of the present invention, also provide a kind of method protecting AC-DC-AC driver soft start to lose efficacy, it implements in aforesaid device, and described method comprises the steps:
When described AC-DC-AC driver powers on, analyze according to the electric current that described current sensor detects, judge that the electric current on AC-DC-AC driver gradually changes or suddenlys change;
When the electric current that lasting pre-determined number measures on described AC-DC-AC driver is sudden change, judge that the soft start function of described AC-DC-AC driver lost efficacy;
In time losing efficacy at the soft start function determining described AC-DC-AC driver, when described AC-DC-AC driver powers on again, generate a control signal, send to the control end of described normally closed relay, the contact controlling described normally closed relay two ends was opened; And carry out alert process.
Implement the embodiment of the present invention, there is following beneficial effect:
Embodiments provide a kind of device and method protecting AC-DC-AC driver soft start to lose efficacy; by measuring the electric current in bus current; according to current flow whether for being in mutation status; judge whether the soft start unit of AC-DC-AC driver fails; when it lost efficacy; opened by the contact controlling the normally closed relay that is located on bus; thus large current charge after soft start can be prevented to lose efficacy when powering on is to the damage of DC filtering unit and driver element; and the failure propagation of rear stage circuit, improve the reliability of system.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention 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 present invention, 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.
Fig. 1 is existing a kind of structural representation with the AC-DC-AC driver of soft start structure;
Fig. 2 is the structural representation that existing another kind has the AC-DC-AC driver of soft start structure;
Fig. 3 is the structural representation of an embodiment of a kind of device protecting AC-DC-AC driver soft start to lose efficacy provided by the invention;
Fig. 4 is the structural representation of an embodiment of control system in Fig. 3;
Fig. 5 is the structural representation of another embodiment of a kind of device protecting AC-DC-AC driver soft start to lose efficacy provided by the invention;
Fig. 6 is the main flow schematic diagram of a kind of method protecting AC-DC-AC driver soft start to lose efficacy provided by the invention.
Embodiment
Below in conjunction with accompanying drawing, explanation is referred to embodiments of the invention.
As shown in Figure 3, be the structural representation of an embodiment of a kind of device protecting AC-DC-AC driver soft start to lose efficacy provided by the invention; In this embodiment, the device 5 that this protection AC-DC-AC driver soft start lost efficacy, it is applied in the AC-DC-AC driver at least including a soft start unit 3, and described device 5 comprises:
Be serially connected in the current sensor 50 on AC-DC-AC driver bus, for detecting the electric current on described bus;
Normally closed relay 51, two contact passes the measuring junction of device 50 and the bus capacitor 2 of described AC-DC-AC driver respectively positive pole with described electric current is connected;
Control device 52; it is connected with the control end of described current sensor 50 with described normally closed relay 50; for the electric current according to the bus that described current sensor 50 detects; generate corresponding control signal; when soft start element failure; the contact controlling described normally closed relay 51 is opened, thus protection AC-DC-AC driver.
Wherein, this AC-DC-AC driver comprises the rectification unit 1 being arranged at front end further, and the soft start unit 3 be connected with this rectification unit 1, and wherein, this soft start unit 3 comprises:
Current-limiting resistance R, it is serially connected on described bus, and before being positioned at described current sensor 50, namely one end of this current-limiting resistance R is connected with described rectification unit 1, and its other end is connected with described current sensor 50;
Normally opened relay 51, its two contact is connected with the two ends of described current-limiting resistance R respectively, and its control end is connected with described control device 52.The function and efficacy of described soft start unit 3 with describe in background technology identical, do not describe in detail at this.
Please further shown in composition graphs 4, Fig. 4 is the structural representation of an embodiment of control system in Fig. 3; In this embodiment, described control device 52 comprises further:
Measuring unit 520, for when described AC-DC-AC driver powers on, analyzes according to the electric current that described current sensor 50 detects, judges that the electric current on AC-DC-AC driver bus gradually changes or suddenlys change;
Condition adjudgement unit 522, when being sudden change for continuing the pre-determined number electric current measured on described AC-DC-AC driver at described measuring unit 520, judges that the soft start function of described AC-DC-AC driver lost efficacy; In one embodiment, this pre-determined number can be such as 3 times, arranges this pre-determined number, can improve the accuracy of condition adjudgement unit 522 judged result; If determining electric current is the sudden change gradually changing or be less than pre-determined number, then judge that this soft start function is in normal condition;
Control unit 544, when soft start function for determining described AC-DC-AC driver at described condition adjudgement unit 522 lost efficacy, when described AC-DC-AC driver powers on again, generate a control signal, send to the control end of described normally closed relay, the contact controlling described normally closed relay two ends is opened, thus one end of bus capacitor 2 is disconnected;
Alarm unit 546, when the soft start function for determining described AC-DC-AC driver at described condition adjudgement unit 522 lost efficacy, carry out alert process, be understandable that, this alarm unit 546 can adopt the such as mode such as sound, audio to report to the police.
Adopt the device that protection AC-DC-AC driver soft start as shown in Figure 3 and 4 lost efficacy, when powering on to AC-DC-AC driver, by current sensor, the electric current in bus current is measured, can judge that whether current flow is for being in mutation status, when current flow continues to be in mutation status, then can judge that the soft start unit of AC-DC-AC driver fails, when it lost efficacy, opened by the contact controlling the normally closed relay that is located on bus, thus large current charge after soft start can be prevented to lose efficacy when powering on is to the damage of DC filtering unit and driver element, and the failure propagation of rear stage circuit, the reliability of raising system.
Fig. 5 is the structural representation of another embodiment of a kind of device protecting AC-DC-AC driver soft start to lose efficacy provided by the invention; In this embodiment, the structure shown in it is substantially identical with the structure shown in Fig. 3, and difference is, soft start unit 3 adopts thyristor.Particularly, this soft start unit 3 comprises a thyristor SCR, and its anode A and negative electrode K are serially connected on described bus, and before being positioned at described current sensor 50; It controls pole G and is connected with described control device 52.Other structures and the principle of work and power refer to the aforementioned description to Fig. 3 and Fig. 4, do not describe in detail at this.
As shown in Figure 6, be the main flow schematic diagram of a kind of method protecting AC-DC-AC driver soft start to lose efficacy provided by the invention.In this embodiment, it adopts and aforementionedly to realize as the device in Fig. 3 to Fig. 5, and the method comprises the steps:
Step S60, when described AC-DC-AC driver powers on, analyzes according to the electric current that described current sensor detects, judges that the electric current on AC-DC-AC driver bus gradually changes or suddenlys change;
Step S62 is when the electric current that lasting pre-determined number measures on described AC-DC-AC driver is sudden change, judge that the soft start function of described AC-DC-AC driver lost efficacy, otherwise judge that the soft start function of described AC-DC-AC driver is normal, in one example in which, this pre-determined number is 3 times;
Step S64, when the soft start function determining described AC-DC-AC driver lost efficacy, when described AC-DC-AC driver powers on again, generated a control signal, send to the control end of described normally closed relay, the contact controlling described normally closed relay two ends is opened; And carry out alert process.If judge that the soft start function of described AC-DC-AC driver is normal, then described normally closed relay protection normally off.
Adopt the method that protection AC-DC-AC driver soft start as shown in Figure 6 lost efficacy, when powering on to AC-DC-AC driver, by current sensor, the electric current in bus current is measured, can judge that whether current flow is for being in mutation status, when current flow continues to be in mutation status, then can judge that the soft start unit of AC-DC-AC driver fails, when it lost efficacy, opened by the contact controlling the normally closed relay that is located on bus, thus large current charge after soft start can be prevented to lose efficacy when powering on is to the damage of DC filtering unit and driver element, and the failure propagation of rear stage circuit, the reliability of raising system.
Implement the embodiment of the present invention, there is following beneficial effect:
Embodiments provide a kind of device and method protecting AC-DC-AC driver soft start to lose efficacy; by measuring the electric current in bus current; according to current flow whether for being in mutation status; judge whether the soft start unit of AC-DC-AC driver fails; when it lost efficacy; opened by the contact controlling the normally closed relay that is located on bus; thus large current charge after soft start can be prevented to lose efficacy when powering on is to the damage of DC filtering unit and driver element; and the failure propagation of rear stage circuit, improve the reliability of system.
Above disclosedly be only present pre-ferred embodiments, certainly can not limit the interest field of the present invention with this, therefore according to the equivalent variations that the claims in the present invention are done, still belong to the scope that the present invention is contained.
Claims (5)
1. protect the device that AC-DC-AC driver soft start lost efficacy, it is applied in the AC-DC-AC driver at least including a soft start unit, it is characterized in that, described device comprises:
Be serially connected in the current sensor on AC-DC-AC driver bus, for detecting the electric current on described bus;
Normally closed relay, two contact passes the measuring junction of device and the bus capacitor of described AC-DC-AC driver respectively positive pole with described electric current is connected;
Control device, it is connected with the control end of described current sensor with described normally closed relay, for the electric current according to the bus that described current sensor detects, generates corresponding control signal, when soft start element failure, the contact controlling described normally closed relay two ends is opened.
2. a kind of device protecting AC-DC-AC driver soft start to lose efficacy as claimed in claim 1, it is characterized in that, described control device comprises further:
Measuring unit, for when described AC-DC-AC driver powers on, analyzes according to the electric current that described current sensor detects, judges that the electric current on AC-DC-AC driver bus gradually changes or suddenlys change;
Condition adjudgement unit, when being sudden change for continuing the pre-determined number electric current measured on described AC-DC-AC driver at described measuring unit, judges that the soft start function of described AC-DC-AC driver lost efficacy;
Control unit, for described condition adjudgement unit judges to described AC-DC-AC driver soft start function lost efficacy time, when described AC-DC-AC driver powers on again, generate a control signal, send to the control end of described normally closed relay, the contact controlling described normally closed relay two ends is opened;
Alarm unit, for described condition adjudgement unit judges to described AC-DC-AC driver soft start function lost efficacy time, carry out alert process.
3. a kind of device protecting AC-DC-AC driver soft start to lose efficacy as claimed in claim 2, it is characterized in that, described soft start unit comprises:
Current-limiting resistance, it is serially connected on described bus, and before being positioned at described current sensor;
Normally opened relay, its two contact is connected with the two ends of described current-limiting resistance respectively, and its control end is connected with described control device.
4. a kind of device protecting AC-DC-AC driver soft start to lose efficacy as claimed in claim 3, it is characterized in that, described soft start unit comprises:
One thyristor, its anode A and negative electrode K are serially connected on described bus, and before being positioned at described current sensor; It controls pole G and is connected with described control device.
5. protect the method that AC-DC-AC driver soft start lost efficacy, it implements in the device as described in any one of Claims 1-4, it is characterized in that, described method comprises the steps:
When described AC-DC-AC driver powers on, analyze according to the electric current that described current sensor detects, judge that the electric current on AC-DC-AC driver bus gradually changes or suddenlys change;
When the electric current that lasting pre-determined number measures on described AC-DC-AC driver is sudden change, judge that the soft start function of described AC-DC-AC driver lost efficacy;
When the soft start function determining described AC-DC-AC driver lost efficacy, when described AC-DC-AC driver powers on again, generate a control signal, send to the control end of described normally closed relay, the contact controlling described normally closed relay two ends was opened; And carry out alert process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511006966.7A CN105471280A (en) | 2015-12-30 | 2015-12-30 | Device and method for protecting soft start failure of AC/DC/AC driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511006966.7A CN105471280A (en) | 2015-12-30 | 2015-12-30 | Device and method for protecting soft start failure of AC/DC/AC driver |
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| CN105471280A true CN105471280A (en) | 2016-04-06 |
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| CN201511006966.7A Pending CN105471280A (en) | 2015-12-30 | 2015-12-30 | Device and method for protecting soft start failure of AC/DC/AC driver |
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| CN (1) | CN105471280A (en) |
Cited By (2)
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| CN107528460A (en) * | 2016-06-22 | 2017-12-29 | 博世力士乐(西安)电子传动与控制有限公司 | Frequency converter soft starting circuit and the frequency converter comprising the circuit |
| CN109842281A (en) * | 2017-11-24 | 2019-06-04 | 南京德朔实业有限公司 | Electric tool |
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