CN206099314U - Overvoltage protection subassembly of converter and converter subassembly thereof - Google Patents
Overvoltage protection subassembly of converter and converter subassembly thereof Download PDFInfo
- Publication number
- CN206099314U CN206099314U CN201621044892.6U CN201621044892U CN206099314U CN 206099314 U CN206099314 U CN 206099314U CN 201621044892 U CN201621044892 U CN 201621044892U CN 206099314 U CN206099314 U CN 206099314U
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- bus
- converter
- voltage
- preset value
- protective module
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Abstract
Overvoltage protection subassembly of converter and converter subassembly thereof, converter include one dc bus (43), and the overvoltage protection subassembly includes one brake unit (12), one voltage suppressor (14) and one measuring unit (16). Brake unit connects in the dc bus, when the voltage of dc bus reaches a first default, and the brake unit consumption of electric energy that starts working. Voltage suppressor connects in the dc bus, when the voltage of dc bus reaches a second default, and the voltage suppressor consumption of electric energy that works, wherein, the second default is greater than first default. Measuring unit can test brake unit's the operating temperature and the voltage of dc bus, if when the voltage that operating temperature reaches a third default or dc bus reaches a fourth default, measuring unit exports a control command (S1) that can control the converter and close. The overvoltage protection subassembly of above -mentioned converter is with low costs, can effectively avoid the converter to damage when the overvoltage appearing.
Description
Technical field
This utility model is related to a kind of overvoltage protective module, more particularly to a kind of overvoltage protective module of converter.
Background technology
Converter can be by changing the frequency of motor working power come controlled motor, to be carried according to being actually needed for motor
Power supply source voltage, reaches energy-conservation, the purpose of speed governing.
As shown in figure 4, converter 40 includes a dc bus 43 and a filter capacitor for being arranged at dc bus 43
44.In the course of work of converter, the voltage of dc bus 43 is that the voltage at the two ends of filter capacitor 44 is possible to occur
The situation of voltage, for example, will cause the overvoltage of above-mentioned dc bus 43, if now in the quick down speeding procedure of motor
Voltage is persistently raised, and easily causes the damage of converter 40.
Utility model content
The purpose of this utility model is to provide a kind of overvoltage protective module of converter, and its low cost can realize self
Protection, especially when open circuit or short trouble occurs in brake unit, can in time cut off main power source, can be prevented effectively from converter
Damage when there is overvoltage.
Another purpose of the present utility model is to provide a kind of frequency converter assembly with above-mentioned overvoltage protective module.
This utility model provides a kind of overvoltage protective module of converter, and converter includes a dc bus, overvoltage
Protection component includes brake unit, a voltage suppressor and a measuring unit.Brake unit is connected to dc bus,
When the voltage of dc bus reaches first preset value, brake unit is started working and consumes electric energy.Voltage suppressor is connected to
Dc bus, when the voltage of dc bus reaches second preset value, voltage suppressor consumption in operation electric energy, wherein, second
Preset value is more than the first preset value.Measuring unit can test the operating temperature of brake unit and the voltage of dc bus, if work
When the voltage for reaching one the 3rd preset value or dc bus as temperature reaches four preset value, measuring unit exports one can
The first control command that control converter is closed.Above-mentioned overvoltage protective module low cost, can realize self-protection, especially when
When open circuit or short trouble occurs in brake unit, main power source can be in time cut off, realize the protection to converter, can be prevented effectively from
Converter is damaged when there is overvoltage.
In a kind of exemplary embodiment of the overvoltage protective module of converter, the 4th preset value is more than the first preset value
And less than the second preset value.
In a kind of exemplary embodiment of the overvoltage protective module of converter, measuring unit includes a temperature sensing
Device, a voltage test device and a control unit.Temperature sensor can sense operating temperature, and reach in operating temperature
First trigger is exported during three preset values.The voltage of voltage test device sensing dc bus reaches the 4th preset value
When export second trigger.Control unit exports the first control after the first trigger or the second trigger is received
System order.
In a kind of exemplary embodiment of the overvoltage protective module of converter, voltage test device sensing dc bus
Voltage be less than four preset values when, export a current detection signal.Measuring unit also includes a current sensing means, electricity
Flow detection device is defeated if can have electric current to export by detection braking unit within a time period after current detection signal is received
Go out the 3rd trigger, control unit receives the 3rd trigger and can also export the first control command.
In a kind of exemplary embodiment of the overvoltage protective module of converter, overvoltage protective module also includes a wind
Fan and a Switching Power Supply.Fan is used to give brake unit cooling.Switching Power Supply has access to dc bus, by dc bus
Energy is obtained, and is powered to fan using the further voltage conversion of the energy.Above-mentioned design can help brake unit to lower the temperature, and improve
The stability of overvoltage protective module.
In a kind of exemplary embodiment of the overvoltage protective module of converter, brake unit includes the system of multiple concatenations
Galvanic electricity hinders.
In a kind of exemplary embodiment of the overvoltage protective module of converter, voltage suppressor is transient voltage suppression
Device or varistor.
This utility model additionally provides a kind of frequency converter assembly, and frequency converter assembly includes a converter and an above-mentioned mistake
Pressure protection component.Converter includes a dc bus.The brake unit of overvoltage protective module, voltage suppressor can be connected to
Dc bus, measuring unit can export the first control command to control converter closing.
In a kind of exemplary embodiment of frequency converter assembly, frequency converter assembly also includes a power switch, its energy
The on or off of converter and an electrical network is enough controlled, measuring unit can simultaneously export first after the 3rd trigger is obtained
Control command and second control command, power switch receives the power supply that converter is cut off after the second control command.It is above-mentioned
Design contributes to preventing the rectification unit and brake unit itself of short circuit current destruction converter.
Hereafter by clearly understandable mode, preferred embodiment is described with reference to the drawings, the overvoltage protective module to converter
And its above-mentioned characteristic of frequency converter assembly, technical characteristic, advantage and its implementation are further described.
Description of the drawings
The following drawings only does schematic illustration and explanation to this utility model, does not limit scope of the present utility model.
Fig. 1 is to illustrate a kind of structural representation of exemplary embodiment of the overvoltage protective module of converter.
Fig. 2 is to illustrate the structural representation of another kind of exemplary embodiment of the overvoltage protective module of converter.
Fig. 3 is to illustrate the structural representation of another exemplary embodiment of the overvoltage protective module of converter.
Fig. 4 is to illustrate the existing structure schematic diagram of converter.
Label declaration
12 brake units
14 voltage suppressors
16 measuring units
162 temperature sensors
164 voltage test devices
166 control units
168 current sensing means
18 Switching Power Supplies
19 fans
20 power switch
30 electrical networks
40 converters
43 dc bus
44 filter capacitors
The control commands of S1 first
The triggers of S2 first
The triggers of S3 second
S4 current detection signals
The triggers of S5 the 3rd
The control commands of S6 second.
Specific embodiment
In order to be more clearly understood to the technical characteristic of utility model, purpose and effect, now control illustrates this
The specific embodiment of utility model, in the various figures identical label represent that structure is identical or structure is similar but function identical portion
Part.
Herein, " schematic " expression " serving as example, example or explanation ", will should not be described herein as " showing
Any diagram of meaning property ", embodiment are construed to a kind of preferred or more advantageous technical scheme.
To make simplified form, the part related to this utility model is only schematically show in each figure, they are not
It is represented as the practical structures of product.In addition, to readily appreciate simplified form, there is identical structure or work(in some figures
The part of energy, only symbolically depicts one of those, or has only marked one of those.
Herein, " first ", " second " etc. are only used for mutual differentiation, rather than the significance level and order for representing them
Deng.
Fig. 1 is to illustrate a kind of structural representation of exemplary embodiment of the overvoltage protective module of converter.Wherein
Represented physical connection, connected with the fine rule representation signal with arrow with thick line between each part in figure, other accompanying drawings are also identical.Overvoltage
Protection component 10 can be connected to the dc bus 43 of converter 40, the existing structure of converter 40 that can be referring also to shown in Fig. 4.
Wherein dc bus 43 is arranged by filter capacitor 44, and in the course of work of converter 40, the voltage of dc bus 43 is filtered
The voltage at the two ends of electric capacity 44 is possible to that the situation of overvoltage occurs.It can be of course be appreciated by those skilled in the art that this practicality is new
The overvoltage protective module of the converter of type, can be applicable to any existing known applicable converter, the concrete structure of converter
The structure being not limited to shown in Fig. 4.
Overvoltage protective module 10 includes 12, voltage suppressor 14 of a brake unit and a measuring unit 16.Its
In, brake unit 12 is connected to dc bus 43, when the voltage of dc bus reaches first preset value, that is, reaches braking single
During the magnitude of voltage that the work of unit 12 starts, brake unit 12 is started working and consumes electric energy.Brake unit 12 generally comprises multiple concatenations
Braking resistor, it can quickly convert electrical energy into heat energy and distribute, so that the voltage of dc bus 43 is maintained at normal model
In enclosing.Voltage suppressor 14 is also connected to dc bus, although voltage suppressor 14 is connected to by brake unit 12 in figure
Dc bus 43, it will be appreciated by a person skilled in the art that only representing one kind schematically arrangement of physical arrangement in figure, its is true
Circuit conditions can have various wire laying modes, such as can also be depicted as in figure brake unit 12 by voltage suppressor 14 with it is straight
Stream bus 43 connects.For voltage suppressor 14, when the magnitude of voltage of dc bus 43 reaches second preset value, that is, electricity is reached
During the magnitude of voltage that the pressure work of suppressor 14 starts, voltage suppressor 14 is started working and consumes electric energy.Voltage suppressor 14 typically may be used
Elect Transient Voltage Suppressor (TVS) or varistor (MOV) as.During work, the two poles of the earth of voltage suppressor 14 can be subject to reverse transient state
The high impedance of its two interpolar can be changed into Low ESR by high energy impact events, voltage suppressor 14, absorb surge power, make two interpolars
Voltage clamp can effectively protect the filter capacitor (referring to Fig. 4) on dc bus 43 so as to voltage in a predetermined value
It is maintained in normal range.
Above-mentioned brake unit 12 and voltage suppressor 14 can consume electric energy when overvoltage occurs in dc bus 43 makes direct current
Bus 43 returns to normal voltage range, prevents converter 40 from damaging.Wherein, the second preset value of voltage suppressor 14 is more than braking
First preset value of unit 12, i.e., be less than the second preset value in the overvoltage that dc bus 43 occurs more than or equal to the first preset value
When, brake unit 12 first works and protects dc bus 43, and after the overvoltage that dc bus 43 occurs reaches the second preset value,
The working range of brake unit 12 can be exceeded, brake unit 12 is resulted even in and damaged and cannot work, now by voltage suppressor
14 start working protects dc bus 43 and converter.
Measuring unit 16 can respectively test the operating temperature of brake unit 12 and the voltage of dc bus 43, if braking is single
When the operating temperature of unit 12 reaches the voltage of one the 3rd preset value or dc bus 43 and reaches four preset value, measuring unit 16
First control command that can control the closing of converter 40 can be exported.Measuring unit 16 can simultaneously monitor brake unit 12
The voltage of operating temperature and dc bus 43, when the operating temperature for finding brake unit 12 reaches a marginal value set in advance
When, in time the first control command of output closes converter to realize protection, and when the voltage for finding dc bus 43 reaches one the
During four preset values, measuring unit 16 can also in time send the first control command and close converter 40 to realize protection, wherein the
Four preset values can set for user, in a kind of better embodiment, the 4th preset value can be made more than the first preset value and
Less than the second preset value.
After using above-mentioned design, can be in the case where there is overvoltage, in time by brake unit 12 and voltage suppressor
The voltage of the dc bus 43 of 14 adjustment converters 40, can also pass through the test case of measuring unit 16, reach in overvoltage
In the case of certain, especially when open circuit or short trouble occurs in brake unit, main power source can be in time cut off, be realized to frequency conversion
The protection of device, can prevent because the damage of brake unit 12 causes the damage of converter 40, effective protection converter.
Fig. 2 is to illustrate the structural representation of another kind of exemplary embodiment of the overvoltage protective module of converter.Such as
Shown in Fig. 2, measuring unit 16 includes 162, voltage test device 164 of a temperature sensor and a control unit 166.
Wherein, temperature sensor 162 can sense the operating temperature of brake unit 12, and pre- more than or equal to the above-mentioned 3rd in operating temperature
If value when export first trigger S2, voltage test device 164 can sense the voltage of dc bus 43 reach it is above-mentioned
During four preset values export second trigger S3, control unit 166 receive the first trigger S2 or second touch
Above-mentioned first control command S1 is exported after signalling S3, to close converter 40 in time.
In the embodiment shown in figure 2, overvoltage protective module 10 also includes a fan 19 and a Switching Power Supply 18,
Fan 19 can be arranged with correct position for lowering the temperature to brake unit 12, and Switching Power Supply 18 can to obtain dc bus 43 defeated
The DC current for going out, and powered to fan 19 using the DC current.Above-mentioned design can help brake unit 18 to lower the temperature, and improve
The stability of pressure protection component.
Fig. 3 is to illustrate the structural representation of another exemplary embodiment of the overvoltage protective module of converter.Such as
Shown in Fig. 3, when the voltage of the sensing dc bus 43 of voltage test device 164 is less than four preset values, a current detecting is exported
Signal S4.Measuring unit 16 also includes a current sensing means 168, its after current detection signal S4 is received, if can be
Detection braking unit 12 has electric current to export in one time period, then export the 3rd trigger S5, and control unit 166 is received
3rd trigger S5 can also export above-mentioned first control command S1 to close converter 40 in time.Above-mentioned design can detect system
Short circuit is formed after whether moving cell 12 damages because of overvoltage, the short circuit of brake unit 12 can destroy the rectification unit of converter 40
(being not drawn in figure), so also to close converter 40 in time after the short circuit of brake unit 12 is detected.
This utility model additionally provides a kind of frequency converter assembly, and as shown in Figure 1 to Figure 3, frequency converter assembly includes a change
Frequency device 40 and an above-mentioned overvoltage protective module.Converter 40 includes a dc bus 43, the braking of overvoltage protective module 10
Unit 12, voltage suppressor 14 can be connected to dc bus 43, and the measuring unit 16 of overvoltage protective module 10 can export
One control command S1 is closed with controlling converter 40.
In the embodiment shown in Fig. 3, frequency converter assembly also includes a power switch 20, and it can control converter
40 with the on or off of electrical network 30, measuring unit 16 after the 3rd trigger S5 is obtained, except exporting above-mentioned first control
Order S5 can also simultaneously export second control command S6, and power switch 20 to be received and cut off frequency conversion after the second control command S6
Device 40 and the conducting of electrical network 30, cut off the power supply of converter 40.Converter is simultaneously closed off after the short circuit of brake unit 12 is detected
40 and the conducting of converter 40 and electrical network 30 is disconnected, prevent short circuit current from destroying the rectification unit (being not drawn in figure) of converter 40
And brake unit 12 itself.
It should be understood that, although this specification is described according to each embodiment, but not each embodiment only includes one
Individual independent technical scheme, this narrating mode of description is only that for clarity those skilled in the art will should say
Bright book as an entirety, the technical scheme in each embodiment can also Jing it is appropriately combined, forming those skilled in the art can be with
The other embodiment of understanding.
The a series of detailed description of those listed above is only for the concrete of possible embodiments of the present utility model
Illustrate, they are simultaneously not used to limit protection domain of the present utility model, it is all without departing from this utility model skill spirit made etc.
Combination, segmentation or the repetition of effect embodiment or change, such as feature, should be included within protection domain of the present utility model.
Claims (9)
1. the overvoltage protective module of converter, converter includes a dc bus (43), it is characterised in that the overvoltage protection
Component (10) includes：
One brake unit (12), it is connected to the dc bus (43), when the voltage of the dc bus (43) reaches one
During the first preset value, the brake unit (12) is started working and consumes electric energy；
One voltage suppressor (14), it is connected to the dc bus (43), when the voltage of the dc bus (43) reaches
During one second preset value, voltage suppressor (14) the consumption in operation electric energy, wherein, second preset value is default more than first
Value；
One measuring unit (16), it can test the operating temperature of the brake unit (12) and the dc bus (43)
Voltage, if the operating temperature reaches one the 3rd preset value or the voltage of the dc bus (43) reaches one the 4th preset value
When, the measuring unit (16) exports one and can control the first control command (S1) that the converter is closed.
2. overvoltage protective module as claimed in claim 1, it is characterised in that the 4th preset value is default more than described first
It is worth and less than second preset value.
3. overvoltage protective module as claimed in claim 1, it is characterised in that the measuring unit (16) includes：
One temperature sensor (162), it can sense the operating temperature, and it is pre- to reach the described 3rd in the operating temperature
If exporting first trigger (S2) during value,
One voltage test device (164), its voltage for sensing the dc bus (43) reaches defeated during four preset value
Go out second trigger (S3),
One control unit (166), it is after first trigger (S2) or second trigger (S3) is received
Export first control command (S1).
4. overvoltage protective module as claimed in claim 3, it is characterised in that voltage test device (164) sensing is described
When the voltage of dc bus (43) is less than four preset value, a current detection signal (S4) is exported,
The measuring unit (16) also includes：
One current sensing means (168), its after the current detection signal (S4) is received, if can examine within a time period
Surveying the brake unit (12) has electric current to export, then export the 3rd trigger (S5), and described control unit (166) is received
First control command (S1) can be also exported to the 3rd trigger (S5).
5. overvoltage protective module as claimed in claim 3, it is characterised in that the overvoltage protective module (10) also includes：
One is used for the fan (19) of the brake unit (12) cooling；
One Switching Power Supply (18), it has access to the dc bus (43), with to the fan (19) power supply.
6. overvoltage protective module as claimed in claim 1, it is characterised in that the brake unit (12) is including multiple concatenations
Braking resistor.
7. overvoltage protective module as claimed in claim 1, it is characterised in that the voltage suppressor (14) is transient voltage suppression
Device processed or varistor.
8. frequency converter assembly, it is characterised in that the frequency converter assembly includes：
One converter (40), it includes a dc bus (43)；With
One overvoltage protective module (10) as any one of claim 1 to 7, the brake unit (12), the electricity
Pressure suppressor (14) can be connected to the dc bus (43), and the measuring unit (16) can export the first control life
Make (S1) to control the converter (40) closing.
9. frequency converter assembly as claimed in claim 8, it is characterised in that the frequency converter assembly also includes a power switch
(20), it can control the on or off of the converter (40) and an electrical network (30), and the measuring unit (16) is obtaining
First control command (S1) and second control command (S6) can be simultaneously exported after 3rd trigger (S5), it is described
Power switch (20) receives the power supply that second control command (S6) cuts off afterwards the converter (40).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621044892.6U CN206099314U (en) | 2016-09-08 | 2016-09-08 | Overvoltage protection subassembly of converter and converter subassembly thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621044892.6U CN206099314U (en) | 2016-09-08 | 2016-09-08 | Overvoltage protection subassembly of converter and converter subassembly thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206099314U true CN206099314U (en) | 2017-04-12 |
Family
ID=58476238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621044892.6U Expired - Fee Related CN206099314U (en) | 2016-09-08 | 2016-09-08 | Overvoltage protection subassembly of converter and converter subassembly thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206099314U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113063209A (en) * | 2021-04-12 | 2021-07-02 | 珠海格力电器股份有限公司 | Frequency control method and device, variable frequency driver and air conditioning equipment |
| CN113411033A (en) * | 2021-07-15 | 2021-09-17 | 中冶赛迪工程技术股份有限公司 | Method for judging input overvoltage of load with motor of frequency converter |
-
2016
- 2016-09-08 CN CN201621044892.6U patent/CN206099314U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113063209A (en) * | 2021-04-12 | 2021-07-02 | 珠海格力电器股份有限公司 | Frequency control method and device, variable frequency driver and air conditioning equipment |
| CN113063209B (en) * | 2021-04-12 | 2022-06-24 | 珠海格力电器股份有限公司 | Frequency control method and device, variable frequency driver and air conditioning equipment |
| CN113411033A (en) * | 2021-07-15 | 2021-09-17 | 中冶赛迪工程技术股份有限公司 | Method for judging input overvoltage of load with motor of frequency converter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170412 |