CN203522154U - Over-current protective device of frequency converter - Google Patents
Over-current protective device of frequency converter Download PDFInfo
- Publication number
- CN203522154U CN203522154U CN201320597534.8U CN201320597534U CN203522154U CN 203522154 U CN203522154 U CN 203522154U CN 201320597534 U CN201320597534 U CN 201320597534U CN 203522154 U CN203522154 U CN 203522154U
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- CN
- China
- Prior art keywords
- frequency converter
- temperature
- control unit
- power supply
- protective device
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The utility model belongs to the technical field of circuit overload protection, and discloses an over-current protective device of a frequency converter. According to the over-current protective device of the frequency converter, an on/off state of a frequency converter power supply can be controlled by monitoring the temperature of a pre-charged resistor of the frequency converter. The over-current protective device of the frequency converter is characterized by comprising a temperature control unit, a power supply control unit and a temperature monitoring unit; a probe of the temperature monitoring unit is arranged at the periphery of the pre-charged resistor, an output terminal of the temperature monitoring unit is connected with an input terminal of the temperature control unit; an output terminal of the temperature control unit is connected with an input terminal of the power supply control unit; and the power supply control unit is connected between a power supply and an inlet wire of the frequency converter power supply. According to the over-current protective device of the frequency converter, the on/off state of a frequency converter power supply can be controlled by monitoring the temperature of a pre-charged resistor of the frequency converter, the frequency converter can be protected, and circuits of the frequency converter can be prevented from burning out caused by a heat over-current.
Description
Technical field
The utility model relates to circuit overloads resist technology field, particularly a kind of frequency converter overcurrent protective device.
Background technology
Frequency converter overcurrent tends to directly cause the DC loop of frequency converter to burn, thereby causes great equipment loss.
Equipment overcurrent mainly comprises following reason:
1, DC bus-bar voltage does not reach prescribed threshold, causes pre-charge resistance continuous operation and generates heat;
2, has gone bad the bypass contactor contact of pre-charge resistance, causes bypass point obstructed, causes pre-charge resistance to generate heat continuously and burn;
3, frequent startup and shutdown, cause the unordered work of pre-charge resistance and stop, and can damage pre-charge resistance;
4, open brake unit inside, closes diode short circuit meeting busbar short-circuit, can burn pre-charge resistance, even can burn whole rectifier bridge.
Known according to above analysis on accident cause, the overcurrent that the burning of frequency converter is embodied directly in pre-charge resistance burns; If from frequency changer improvement, certainly can fundamentally solve the flow problem of crossing of frequency converter; But in actual work operation process, often all can only after frequency converter burns, check that analytical equipment could find the source of trouble of frequency converter, equipment property loss cannot be retrieved; Therefore, just need to a kind ofly can in equipment fault, remind staff's equipment fault, and the protective device of protecting frequency converter further to damage.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of protective device that can send frequency converter failure the further damage of containment equipment in time.
For solving the problems of the technologies described above, the utility model provides a kind of frequency converter overcurrent protective device, by monitoring the temperature of the pre-charge resistance of frequency converter, controls the break-make of converter power supply; Described frequency converter overcurrent protective device comprises: temperature control unit, power control unit and temperature monitoring unit; It is peripheral that the probe of described temperature monitoring unit is placed in described pre-charge resistance, and the output of described temperature monitoring unit is connected with the input of described temperature control unit; The output of described temperature control unit is connected with the input of described power control unit; Described power control unit is connected between power supply source and described converter power supply inlet wire.
Further, described temperature control unit comprises: temperature controller; Described temperature controller input is connected with the output of described temperature monitoring unit, receives temperature signal and sends control command to described power control unit, controls the break-make of power supply.
Further, described power control unit comprises: contactor; Described contactor is connected between power supply source and described converter power supply inlet wire, controls the power supply of described frequency converter and supplies with.
Further, described temperature monitoring unit comprises: temperature sensor; The probe of described temperature sensor is placed in the outside of described pre-charge resistance, and the temperature of the described pre-charge resistance monitoring is sent to described temperature controller.
The temperature of the frequency converter overcurrent protective device that the utility model provides by temperature monitoring unit Real-Time Monitoring frequency converter pre-charge resistance also sends to temperature control unit, and the power supply that further driving power control unit is controlled frequency converter is supplied with; Thereby avoid the excess Temperature of pre-charge resistance to burn, or the problem that causes pre-charge resistance excess Temperature that pre-charge resistance overcurrent causes to burn due to other faults of circuit.
Accompanying drawing explanation
The electrical structure block diagram of the frequency converter overcurrent protective device that Fig. 1 provides for the utility model embodiment.
Embodiment
Referring to Fig. 1, a kind of frequency converter overcurrent protective device that the utility model embodiment provides, by monitoring the temperature of the pre-charge resistance of frequency converter, controls the break-make of converter power supply; Frequency converter overcurrent protective device comprises: temperature control unit, power control unit and temperature monitoring unit; It is peripheral that the probe of temperature monitoring unit is placed in described pre-charge resistance, for the temperature of Real-Time Monitoring pre-charge resistance, and the distance of adjustable range pre-charge resistance according to actual needs; The output of temperature monitoring unit is connected with the input of temperature control unit, sends the temperature information of the pre-charge resistance monitoring to temperature control unit, thereby relatively sends corresponding control command with default safe temperature critical value; The output of temperature control unit is connected with the input of power control unit, receives and carry out the control command of temperature control unit; Power control unit is connected between power supply source and converter power supply inlet wire, specifically by controlling the power supply of frequency converter, supplies with the protection that realizes frequency converter.
Temperature monitoring unit, for the temperature of Real-Time Monitoring pre-charge resistance, can be realized by temperature sensor; According to concrete frequency converter, install and use the temperature sensor of environmental selection different sensitivity; Meanwhile, also can select a plurality of temperature sensors simultaneously, realize omnibearing monitoring, monitor to greatest extent the temperature of pre-charge resistance.
Temperature control unit is mainly used in receiving the real time temperature information of temperature sensor feedback, by real time temperature and default safety critical temperature comparison; When pre-charge resistance temperature is higher than safety critical temperature time, the supply of cutting off the electricity supply of driving power control unit, avoids frequency converter further to damage.
In real-world operation process, the temperature of pre-charge resistance in high-order but surpass safety critical temperature, may be due to some little node short circuit all the time, can't directly cause equipment burnout, but be a potential safety hazard all the time; Given this, temperature controller, except default safety critical temperature, also arranges warning temperature, when temperature reaches warning temperature, sends and reports to the police but do not cut off the electricity supply; Can guarantee normally carrying out of production on the one hand; To maintenance staff, give a warning on the other hand, so that it can investigate problem in time, avoid further device damage.The present embodiment is realized the reception of temperature and is realized control operation by TTC-315 type temperature controller.
Power control unit, for controlling the on/off of frequency converter, is specially contactor; Be connected between power supply source and converter power supply inlet wire, specifically receive and carry out the control command of temperature controller, control the break-make of the power supply supply of frequency converter.
The frequency converter overcurrent protective device that the utility model provides is by the temperature of the pre-charge resistance of temperature sensor Real-Time Monitoring frequency converter, and the power supply that sends to temperature controller to generate control command driving contactor control frequency converter is supplied with.Thereby the power supply that cut off frequency converter before frequency converter failure also forms the loss that cannot retrieve is supplied with, and has protected frequency converter.
It should be noted last that, above embodiment is only unrestricted in order to the technical solution of the utility model to be described, although the utility model is had been described in detail with reference to example, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement the technical solution of the utility model, and not departing from the spirit and scope of technical solutions of the utility model, it all should be encompassed in the middle of claim scope of the present utility model.
Claims (4)
1. a frequency converter overcurrent protective device, by monitoring the temperature of the pre-charge resistance of frequency converter, controls the break-make of converter power supply; It is characterized in that, described frequency converter overcurrent protective device comprises: temperature control unit, power control unit and temperature monitoring unit; It is peripheral that the probe of described temperature monitoring unit is placed in described pre-charge resistance, and the output of described temperature monitoring unit is connected with the input of described temperature control unit; The output of described temperature control unit is connected with the input of described power control unit; Described power control unit is connected between power supply source and described converter power supply inlet wire.
2. frequency converter overcurrent protective device as claimed in claim 1, is characterized in that, described temperature control unit comprises: temperature controller; Described temperature controller input is connected with the output of described temperature monitoring unit, receives temperature signal and sends control command to described power control unit, controls the break-make of power supply.
3. frequency converter overcurrent protective device as claimed in claim 2, is characterized in that, described power control unit comprises: contactor; Described contactor is connected between power supply source and described converter power supply inlet wire, controls the power supply of described frequency converter and supplies with.
4. frequency converter overcurrent protective device as claimed in claim 3, is characterized in that, described temperature monitoring unit comprises: temperature sensor; The probe of described temperature sensor is placed in the outside of described pre-charge resistance, and the temperature of the described pre-charge resistance monitoring is sent to described temperature controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320597534.8U CN203522154U (en) | 2013-09-26 | 2013-09-26 | Over-current protective device of frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320597534.8U CN203522154U (en) | 2013-09-26 | 2013-09-26 | Over-current protective device of frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203522154U true CN203522154U (en) | 2014-04-02 |
Family
ID=50381029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320597534.8U Expired - Fee Related CN203522154U (en) | 2013-09-26 | 2013-09-26 | Over-current protective device of frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203522154U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108008235A (en) * | 2017-11-17 | 2018-05-08 | 珠海格力电器股份有限公司 | Dc bus method for detecting short circuit, device and detection circuit |
| CN110932230A (en) * | 2019-11-11 | 2020-03-27 | 珠海格力电器股份有限公司 | Temperature protection circuit for magnetic suspension frequency converter and magnetic suspension frequency converter |
-
2013
- 2013-09-26 CN CN201320597534.8U patent/CN203522154U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108008235A (en) * | 2017-11-17 | 2018-05-08 | 珠海格力电器股份有限公司 | Dc bus method for detecting short circuit, device and detection circuit |
| CN110932230A (en) * | 2019-11-11 | 2020-03-27 | 珠海格力电器股份有限公司 | Temperature protection circuit for magnetic suspension frequency converter and magnetic suspension frequency converter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140402 Termination date: 20190926 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |