CN109327182A - A DC bus overvoltage protection device, a control method and a servo driver - Google Patents
A DC bus overvoltage protection device, a control method and a servo driver Download PDFInfo
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- CN109327182A CN109327182A CN201811313972.0A CN201811313972A CN109327182A CN 109327182 A CN109327182 A CN 109327182A CN 201811313972 A CN201811313972 A CN 201811313972A CN 109327182 A CN109327182 A CN 109327182A
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- bus
- soft
- voltage
- soft start
- start switch
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
- H02P29/0241—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the fault being an overvoltage
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The present invention relates to Serve Motor Control fields, especially a kind of DC bus over-pressure safety device, control method and a kind of servo-driver, including DC bus-bar voltage detection module, control module and for going here and there the soft starting circuit being located on DC bus, soft starting circuit includes the soft start switch branch being arranged in parallel and soft start resistance branch, soft start switch branch road string is equipped with soft start switch, string is equipped with soft start resistance in soft start resistance branch, the signal input part of control module connects DC bus-bar voltage detection module, the signal output end of control module connects soft start switch, when DC bus-bar voltage is more than or equal to overvoltage threshold, soft start switch is controlled to disconnect, soft start resistance is linked into DC bus, when occurring overcurrent on DC bus, soft start resistance increases rapidly, on DC bus Electric current have and significantly reduce, guarantee driver safe operation, improve the efficiency of circuit operation.
Description
Technical field
The present invention relates to Serve Motor Control field, especially a kind of DC bus over-pressure safety device, control method and
A kind of servo-driver.
Background technique
AC servo drive system is mainly made of AC servomotor and AC servo driver, and AC servo drives
Dynamic device drives control object to carry out Electric Traction control by AC servomotor.At present in AC servo drive system, watch
It takes driver and completes AC-DC-exchange conversion for main, in the conversion process, if DC bus-bar voltage is more than certain
Limit value, servo-driver abnormal work can be caused, power component can be burnt under serious situation.
Wherein, there are many kinds of the reason of causing DC bus-bar voltage over-voltage, such as: grid voltage mutation, load are unloaded suddenly
Carry etc..In practical applications, DC bus-bar voltage protection against excessive pressure can generally be taken.In the prior art, driver direct current is female
Line overvoltage protection generally relies on AD sampling, and after detected DC bus-bar voltage is by divider resistance decompression sampling, falling in can be examined
The range measured, to set the fault alarm range of voltage by software program.Either, it is fixed by precision voltage source chip
The voltage of comparator one end is compared therewith again after detected DC bus-bar voltage sampling, is as a result carried out by comparator
Output, and corresponding protection act is controlled, it is general using the form for disconnecting DC bus switch, it is carried out using above-mentioned comparison result
The reliability of control is lower, if leading to fault not in time because protecting in the case where bus overvoltage, on DC bus
It has overcurrent to flow through, is not only easily damaged power component in this way, driver can cause fire under serious situation.
Summary of the invention
The object of the present invention is to provide a kind of DC bus over-pressure safety device and control methods, to solve when direct current is female
Line voltage directly disconnects protection act insecure problem of switch when being more than threshold value；The present invention also provides a kind of servo-drives
Device is able to solve the unreliable caused power component damage of servo-driver protection act in DC bus-bar voltage over-voltage
Problem.
In order to realize the overvoltage protection of DC bus, solve directly to disconnect switch when DC bus-bar voltage is more than threshold value
The insecure problem of protection act；The present invention provides a kind of DC bus over-pressure safety device, including DC bus-bar voltage detection
Module, control module and for going here and there the soft starting circuit being located on DC bus, the soft starting circuit includes being arranged in parallel
Soft start switch branch and soft start resistance branch, soft start switch branch road string is equipped with soft start switch, described soft
Start-up resistor branch road string is equipped with soft start resistance, and the signal input part of the control module connects the DC bus-bar voltage inspection
Module is surveyed, the signal output end of control module connects the soft start switch, when DC bus-bar voltage is more than or equal to over-voltage
When threshold value, control soft start switch is disconnected, and soft start resistance is linked into DC bus.
Beneficial effect is, in DC bus over-voltage, control soft start switch disconnects and soft start resistance is accessed direct current
In bus, the partial pressure to the overvoltage of DC bus-bar voltage is realized by soft start resistance, when occurring overcurrent on DC bus
When, soft start resistance increases rapidly, and the electric current on DC bus has and significantly reduces, and guarantees that driver is transported safely
Row improves the efficiency of circuit operation.
Further, in order to keep the soft start switch off-state of certain time, so that protection is more accurate effectively, it should
In device when DC bus-bar voltage is less than or equal to safe operating voltage threshold value, the soft start controlled in soft starting circuit is opened
It closes and closes, soft start resistance is exited from DC bus, the safe operating voltage threshold value is less than the overvoltage threshold.
Further, in order to the detection of voltage is fallen into detectable range, the DC bus-bar voltage detection module packet
A partial pressure branch of the positive and negative end for being connected to DC bus is included, partial pressure branch road string is equipped at least two partial pressure electricity
Resistance.
Further, in order to simply and easily realize the detection and processing of voltage, the control module includes comparator, light
The first input end of coupling and digital signal processor, the comparator connects reference voltage, the second input terminal of the comparator
The detection voltage output end of connection partial pressure branch, the output end of the comparator connects the signal input part of the optocoupler, described
The signal output end of optocoupler connects the signal input part of the digital signal processor, and the signal of the digital signal processor is defeated
Outlet connects the soft start switch.
Further, in order to avoid driver is burnt out, electric current in circuit is significantly reduced, the soft start resistance includes
At least one PTC resistor.
The present invention provides a kind of DC bus overvoltage protection control methods, when DC bus-bar voltage is more than or equal to over-voltage
When threshold value, the soft start switch controlled in soft starting circuit is disconnected, and soft start resistance is linked into DC bus, in direct current mother
When line over-voltage, control soft start switch disconnects and accesses soft start resistance in DC bus, passes through the realization pair of soft start resistance
The partial pressure of the overvoltage of DC bus-bar voltage, when occurring overcurrent on DC bus, soft start resistance is increased rapidly, directly
Electric current on stream bus has and significantly reduces, and guarantees driver safe operation, improves the efficiency of circuit operation.
Further, in order to keep the soft start switch off-state of certain time, so that protection is more accurate effectively, it should
In method when DC bus-bar voltage is less than or equal to safe operating voltage threshold value, the soft start controlled in soft starting circuit is opened
It closes and closes, soft start resistance is exited from DC bus, the safe operating voltage threshold value is less than the overvoltage threshold.
The present invention provides a kind of servo-driver, including rectification module, inverter module and DC bus over-pressure safety device,
The DC side of rectification module and the DC side of inverter module are connected by DC bus, the DC bus over-pressure safety device packet
DC bus-bar voltage detection module, control module and soft starting circuit are included, the soft starting circuit string is located on DC bus,
The soft starting circuit includes the soft start switch branch being arranged in parallel and soft start resistance branch, the soft start switch branch
Upper string is equipped with soft start switch, and string is equipped with soft start resistance in the soft start resistance branch, and the signal of the control module is defeated
Enter end and connect the DC bus-bar voltage detection module, the signal output end of control module connects the soft start switch, when straight
When flowing busbar voltage more than or equal to overvoltage threshold, control soft start switch is disconnected, and soft start resistance is linked into direct current mother
In line.
Beneficial effect is to provide a kind of servo-driver with overvoltage protection, in DC bus over-voltage, controls soft open
Dynamic switch disconnects and accesses soft start resistance in DC bus, is realized by soft start resistance to the excessively electric of DC bus-bar voltage
The partial pressure of pressure, when occurring overcurrent on DC bus, soft start resistance is increased rapidly, and the electric current on DC bus has
It significantly reduces, guarantees driver safe operation, improve the efficiency of circuit operation, ensure that the operation of servo-driver,
Improve the service life of servo-driver.
Further, in order to keep the soft start switch off-state of certain time, so that protection is more accurate effectively, when
When DC bus-bar voltage is less than or equal to safe operating voltage threshold value, the soft start switch closure in soft starting circuit is controlled,
Soft start resistance is exited from DC bus, the safe operating voltage threshold value is less than the overvoltage threshold.
Further, in order to the detection of voltage is fallen into detectable range, the DC bus-bar voltage detection module packet
A partial pressure branch of the positive and negative end for being connected to DC bus is included, partial pressure branch road string is equipped at least two partial pressure electricity
Resistance.
Further, in order to simply and easily realize the detection and processing of voltage, the control module includes comparator, light
The first input end of coupling and digital signal processor, the comparator connects reference voltage, the second input terminal of the comparator
The detection voltage output end of connection partial pressure branch, the output end of the comparator connects the signal input part of the optocoupler, described
The signal output end of optocoupler connects the signal input part of the digital signal processor, and the signal of the digital signal processor is defeated
Outlet connects the soft start switch.
Further, in order to avoid driver is burnt out, electric current in circuit is significantly reduced, the soft start resistance includes
At least one PTC resistor.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of servo-driver of the invention；
Fig. 2 is a kind of flow chart of DC bus overvoltage protection control methods of the invention；
In figure, 11 it is soft start resistance, 12 is soft start switch, 13 is filter capacitor, 14 is over-voltage detection unit, 15 is
Rectification module, 16 for the first divider resistance, 17 be the second divider resistance, 18 be digital signal processor, 21 be soft starting circuit,
50 be detection voltage output end.
Specific embodiment
The present invention will be further described in detail with reference to the accompanying drawing.
Servo-driver embodiment
The present invention provides a kind of servo-driver, as shown in Figure 1, (not drawing in figure including rectification module 15, inverter module
Connected out) with DC bus over-pressure safety device, the DC side of rectification module 15 and the DC side of inverter module by DC bus
It connects, DC bus over-pressure safety device includes DC bus-bar voltage detection module, control module and soft starting circuit 21, soft to open
The dynamic string of circuit 21 is located on DC bus, and soft starting circuit 21 includes the soft start switch branch and soft start resistance being arranged in parallel
Branch, soft start switch branch road string are equipped with soft start switch 12, and string is equipped with soft start resistance 11, control in soft start resistance branch
The signal input part of molding block connects DC bus-bar voltage detection module, and the signal output end of control module connects soft start switch
12, when DC bus-bar voltage is more than or equal to overvoltage threshold, control soft start switch 12 is disconnected, and soft start resistance 11 is connect
Enter into DC bus.Meanwhile when DC bus-bar voltage is less than or equal to safe operating voltage threshold value, control soft start electricity
Soft start switch closure in road, soft start resistance is exited from DC bus, safe operating voltage threshold value is less than over-voltage threshold
Value.
Soft start resistance branch in above-mentioned soft starting circuit is not limited to switch shown in Fig. 1, can also be with class
Not only can be set like the switching device of MOS switch pipe etc, in soft start resistance branch resistance can also be arranged accordingly after
The devices such as electric appliance, switching tube.
Above-mentioned DC bus-bar voltage detection module includes at least two points of positive and negative end for being series at DC bus
Piezoresistance and the detection voltage output end for being connected to one of divider resistance tie point, as shown in Figure 1, it is preferable that direct current is female
Line voltage detection module includes two divider resistances and detection voltage output end 50, and two of them divider resistance is respectively first point
Piezoresistance 16 and the second divider resistance 17.
Above-mentioned control module includes over-voltage detection unit 14 and digital signal processor 18, preferably over-voltage detection unit 14
Including optocoupler and comparator, the first input end of comparator connects reference voltage, the second input terminal connection partial pressure branch of comparator
The detection voltage output end 50 on road, the signal input part of the output end connection optocoupler of comparator, the signal output end connection of optocoupler
The signal output end of the signal input part of digital signal processor 18, digital signal processor 18 connects soft start switch 12.By
Can only there be a threshold value therefore to state control module on the implementation in the over-voltage detection unit 14 for including optocoupler and comparator
It, can be without the judgement of safe operating voltage threshold condition when function；When needing to carry out safe operating voltage threshold condition
It when judgement, can be judged by way of program, generate control instruction and controlled accordingly；For example, at this time can be straight
It connected acquisition module and obtains corresponding voltage value signal, and transmitted a signal to control module and by the place inside control module
Reason unit exports control instruction after being handled.
The element of soft start resistance 11 is thermistor, and specific soft start resistance 11 is at least one PTC resistor, example
Such as, a PTC resistor or at least two PTC resistors are constituted in parallel or series, or by least three PTC resistor mixed connections
It constitutes.When occurring overcurrent on DC bus, PTC resistor is since heating power increase causes temperature to rise, when temperature is more than
When switch temperature, PTC resistor moment can increase severely, and the electric current in circuit is quickly decreased to safety value.After PTC resistor movement, circuit
Middle electric current has and significantly reduces, and driver is avoided to burn out.
Filter capacitor 13 is connected between the positive and negative anodes of DC bus, when by the rectified voltage of rectification module 15 first
When being applied to soft starting circuit 21, filter capacitor 13 is started to charge by soft start resistance 11, and the ginseng of the soft start resistance 11
Number is chosen according to the electric current flowed into when capacitor charging.Once circuit condition meets the requirement of capacitor normal operation, soft start
Switch 12 will be activated, so that soft start switch 12 is closed short-circuit soft start resistance 11, so that electric current can flow through soft start switch
12。
16 resistance value of the first divider resistance of bleeder circuit in above-mentioned DC bus-bar voltage detection is relatively high, for MW grades of resistances
Value, to reduce the power consumption of the first divider resistance 16.Over-voltage detection unit 14 is used to detect the voltage of detection voltage output end 50 simultaneously
Processing result is sent into digital signal processor 18.
Installation practice
The present invention provides a kind of DC bus over-pressure safety device, including DC bus-bar voltage detection module, control module
And for going here and there the soft starting circuit being located on DC bus, soft starting circuit include the soft start switch branch being arranged in parallel and
Soft start resistance branch, soft start switch branch road string are equipped with soft start switch, and string is equipped with soft start in soft start resistance branch
Resistance, the signal input part of control module connect DC bus-bar voltage detection module, and the signal output end connection of control module is soft
It starts switch, when DC bus-bar voltage is more than or equal to overvoltage threshold, control soft start switch is disconnected, by soft start resistance
It is linked into DC bus.
Meanwhile when DC bus-bar voltage is less than or equal to safe operating voltage threshold value, control in soft starting circuit
Soft start switch closure, soft start resistance is exited from DC bus, and safe operating voltage threshold value is less than overvoltage threshold.
Wherein, DC bus-bar voltage detection module, soft starting circuit and control module have in above-mentioned servo-driver
Body is illustrated, and present apparatus embodiment repeats no more.
Embodiment of the method
The present invention provides a kind of DC bus overvoltage protection control methods, when DC bus-bar voltage is more than or equal to over-voltage
When threshold value, the soft start switch 12 controlled in soft starting circuit is disconnected, and soft start resistance 11 is linked into DC bus.
It is specific as shown in Figure 2, comprising the following steps:
Step S1: a reference voltage VREF is obtained.
When obtaining reference voltage VREF, the value of reference voltage VREF according to the amplitude of safe operating voltage threshold value come
It determines.Overvoltage threshold should be higher than the amplitude of safe operating voltage threshold value, but should be less than filter capacitor 13 and will receive damage
Voltage level.
Step S2: voltage U1 is extracted from DC bus-bar voltage.
DC bus-bar voltage is depressured by bleeder circuit, for example, according to the first divider resistance 16 and the second partial pressure
The ratio of resistance 17 obtains pantograph ratio, and defining the first divider resistance 16 and 17 ratio of the second divider resistance is 4000:1, then obtains
The pantograph ratio of voltage is 1/4001, because driver busbar voltage changes always, is wanted to the voltage of driver DC bus
Acquisition in real time, the value acquired each time is a definite value, is defined as Vbus.It, can be by Vbus when progress voltage compares
Multiplied by voltage scaling ratio, obtains voltage U1 and be compared；Vbus can also be directly compared with given threshold.
Step S3: voltage will be extracted and generated and the sampled voltage Udc of reference voltage altogether by isolating amplifier circuit.
The voltage U1 extracted from DC bus not altogether due to cannot with reference voltage VREF directly compared with, need
The sampled voltage Udc altogether with reference voltage VREF is converted by isolating amplifier circuit.
Step S4: sampled voltage Udc is compared with reference voltage VREF, obtains comparison result.
If sampled voltage Udc is less than reference voltage VREF, comparator output is 0 (low level signal), if sampling electricity
Udc is pressed to be greater than reference voltage VREF, comparator output is 1 (high level signal).
Step S5: accessing optocoupler for comparison result and export processing signal, is sent into digital signal processor.
When definition DC bus-bar voltage is normal, over-voltage output result is connect light the result is that 0 (low level signal) by over-voltage output
Coupling anode, optocoupler ends at this time, and digital signal processor 18 will not be connected to guarded command signal.
If when DC bus-bar voltage over-voltage, over-voltage is exported the result is that 1 (high level signal), optocoupler is on shape at this time
State, digital signal processor 18 can be connected to protection signal, prompt DC bus over-voltage.
Step S6: digital signal processor 18 judges whether over-voltage according to comparison result, and controls when determining over-voltage
Soft start switch 12 disconnects, and realizes overvoltage protection.
When definition DC bus-bar voltage is normal, it is 1 (high level signal) that digital signal processor 18, which sends soft start order,
Soft start order control soft start switch 12 is closed, driver works normally.
If when DC bus-bar voltage over-voltage, it is 0 (low level signal) that digital signal processor 18, which sends soft start order,
Soft start switch 12 disconnects at this time, and PTC resistor accesses holding circuit work.When there is overcurrent in circuit because failure, PTC electricity
Dynamic resistance is made, and protects driver not because of overcurrent damage power device.
In addition, being controlled in soft starting circuit when DC bus-bar voltage is less than or equal to safe operating voltage threshold value
Soft start switch 12 is closed, and soft start resistance 11 is exited from DC bus, and safe operating voltage threshold value is less than overvoltage threshold；
The control by an optocoupler due to that can not be realized, so if the control in method including the part can pass through software program
Mode carry out the judgements of two threshold conditions.
Specific embodiment of the present invention is presented above, but the present invention is not limited to described embodiment.
The technological means in above-described embodiment is converted by the way of being readily apparent that those skilled in the art, is replaced,
Modification, and play the role of with the present invention in relevant art means it is essentially identical, realization goal of the invention it is also essentially identical,
The technical solution formed in this way is to be finely adjusted to be formed to above-described embodiment, and this technical solution still falls within protection of the invention
In range.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811313972.0A CN109327182A (en) | 2018-11-06 | 2018-11-06 | A DC bus overvoltage protection device, a control method and a servo driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811313972.0A CN109327182A (en) | 2018-11-06 | 2018-11-06 | A DC bus overvoltage protection device, a control method and a servo driver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109327182A true CN109327182A (en) | 2019-02-12 |
Family
ID=65260912
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811313972.0A Pending CN109327182A (en) | 2018-11-06 | 2018-11-06 | A DC bus overvoltage protection device, a control method and a servo driver |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110445111A (en) * | 2019-08-02 | 2019-11-12 | 南京南瑞继保电气有限公司 | A kind of magnetic control type paralleling reactor control winding DC bus overvoltage protection system |
| CN111564962A (en) * | 2020-05-23 | 2020-08-21 | 上海沪工焊接集团股份有限公司 | Anti-surge current limiting circuit and method applied to inverter welding machine power supply |
| CN112039324A (en) * | 2020-07-31 | 2020-12-04 | 珠海格力电器股份有限公司 | Overvoltage protection circuit, method and device, power supply equipment and computer readable medium |
| CN112491257A (en) * | 2020-11-17 | 2021-03-12 | 北京精密机电控制设备研究所 | Integrated DC power supply conditioning device |
| CN113067214A (en) * | 2021-03-24 | 2021-07-02 | 西安领充创享新能源科技有限公司 | Direct current socket and direct current socket control method |
| CN115864814A (en) * | 2023-02-27 | 2023-03-28 | 阳光电源股份有限公司 | Soft start circuit and power conversion equipment |
| CN115912267A (en) * | 2022-11-09 | 2023-04-04 | 成都哈工驱动科技有限公司 | Common direct current bus pair dragging device based on servo drive |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110445111A (en) * | 2019-08-02 | 2019-11-12 | 南京南瑞继保电气有限公司 | A kind of magnetic control type paralleling reactor control winding DC bus overvoltage protection system |
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| CN111564962A (en) * | 2020-05-23 | 2020-08-21 | 上海沪工焊接集团股份有限公司 | Anti-surge current limiting circuit and method applied to inverter welding machine power supply |
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| CN112491257A (en) * | 2020-11-17 | 2021-03-12 | 北京精密机电控制设备研究所 | Integrated DC power supply conditioning device |
| CN113067214A (en) * | 2021-03-24 | 2021-07-02 | 西安领充创享新能源科技有限公司 | Direct current socket and direct current socket control method |
| CN113067214B (en) * | 2021-03-24 | 2023-08-04 | 西安领充创享新能源科技有限公司 | DC socket and DC socket control method |
| CN115912267A (en) * | 2022-11-09 | 2023-04-04 | 成都哈工驱动科技有限公司 | Common direct current bus pair dragging device based on servo drive |
| CN115912267B (en) * | 2022-11-09 | 2023-11-21 | 成都哈工驱动科技有限公司 | Servo-drive-based common direct current bus opposite-dragging device |
| CN115864814A (en) * | 2023-02-27 | 2023-03-28 | 阳光电源股份有限公司 | Soft start circuit and power conversion equipment |
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Application publication date: 20190212 |