CN202798440U - Intelligent braking unit for inverters - Google Patents
Intelligent braking unit for inverters Download PDFInfo
- Publication number
- CN202798440U CN202798440U CN 201220353605 CN201220353605U CN202798440U CN 202798440 U CN202798440 U CN 202798440U CN 201220353605 CN201220353605 CN 201220353605 CN 201220353605 U CN201220353605 U CN 201220353605U CN 202798440 U CN202798440 U CN 202798440U
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- circuit
- single tube
- tube module
- igbt single
- diode
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Abstract
The utility model provides an intelligent braking unit for inverters, comprising a chopper circuit, a resistance detection circuit, a main controller, a braking rate selection circuit, a bus voltage detection circuit and an auxiliary power supply circuit. The chopper circuit comprises an IGBT single tube module, the collector of the IGBT single tube module collector is connected with the positive electrode of a direct-current bus after being reversely connected with a first diode, and the emitter of the IGBT single tube module is connected with the negative electrode of the direct-current bus; a second diode is reversely connected in parallel between the collector and the emitter of the IGBT single tube module; the first diode is connected in parallel with a braking resistor; the gate of the IGBT single tube module is controlled by the main controller through an IGBT driving circuit; the input end of the resistance detection circuit is separately connected with the collector of the IGBT single tube module and the negative electrode of the direct-current bus, and the output end of the resistance detection circuit is connected with the main controller; the braking rate selection circuit includes a dial switch connected with an I/O terminal of the main controller; and the input end of the bus voltage detection circuit is connected with the direct-current bus and the output end of the bus voltage detection circuit is connected with the I/O terminal of the main controller.
Description
Technical field
The utility model relates to a kind of employing wave chopping technology, Automatic Measurement Technique and intelligent control technology, is specifically related to a kind of intelligent type frequency-conversion device brake unit.
Background technology
Brake unit, full name is " frequency converter tailored version dynamic braking unit ", be mainly used in controlling mechanical duty ratio heavier, retro-speed requires very fast occasion, the electric equipment that the mode that the electric energy of regenerating in the motor braking process is consumed energy with resistance sponges, the input of brake unit is connected on the dc bus of frequency converter, and output connects brake resistance.
The part brake unit of frequency converter manufacturer and frequency converter accessory manufacturer has following defective on the market at present:
One, can not automatically detect brake resistance and whether access major loop, when the wiring of brake resistance occurs coming off or during wiring error, can not detect the state of brake resistance, when motor braking, if brake resistance wiring error and brake unit still by normal condition work, easily cause device security accident and personal safety accident.
Two, braking ratio can not be adjusted, and most of transducer brake units are often set fixing braking ratio, can not adjust flexibly, thereby make brake unit can not meet the requirement of some industrial occasions that braking ratio is had relatively high expectations fully.
Three, overload protection is simpler.The supporting endergonic ability of brake resistance of each brake unit is all fixed, and the energy that therefore brake resistance is absorbed must be monitored.Relatively more current way is that a thermoswitch is installed in braking resistor cubicle at present, when resistance temperature surpasses set point, automatically cut off major loop or output fault-signal to frequency converter, but the thermoswitch certainty of measurement is not high, is subject to external interference.
The utility model content
The technical problems to be solved in the utility model is: a kind of intelligent type frequency-conversion device brake unit is provided, adopts the microcomputerized control design, have efficient, high safety, advantage that reliability is high.
The utility model is to solve the problems of the technologies described above the technical scheme of taking to be: a kind of intelligent type frequency-conversion device brake unit is characterized in that: it comprises chopper circuit, resistance detecting circuit, master controller, braking ratio selection circuit, busbar voltage testing circuit and auxiliary power circuit;
Wherein chopper circuit comprises IGBT single tube module, IGBT(igbt) be connected with dc bus is anodal behind the collector electrode differential concatenation first diode D1 of single tube module, the emitter of IGBT single tube module is connected with the dc bus negative pole; Reverse parallel connection the second diode D2 between the collector and emitter of IGBT single tube module; The first diode D1 is in parallel with brake resistance; The grid of IGBT single tube module is controlled by the IGBT drive circuit by master controller;
Described resistance detecting circuit is formed by connecting by discharge circuit and follow circuit, it comprises 2 inputs, first input end is connected with the collector electrode of IGBT single tube module, and the second input is connected with the dc bus negative pole, and the output of resistance detecting circuit is connected with described master controller;
Described braking ratio selects circuit to comprise toggle switch, and toggle switch is connected with the I/O port of described master controller;
The input of described busbar voltage testing circuit is connected with dc bus, and its output is connected with the I/O port of described master controller;
Described auxiliary power circuit provides power supply for other each module.
Press such scheme, described the second diode D2 two ends are the first capacitor C 1 in parallel also.
The beneficial effects of the utility model are: increase resistance detecting circuit, braking ratio selection circuit, and unification is controlled by master controller, realize the monitoring brake resistance whether place in circuit, manually select braking ratio, the access of control brake resistance and the function of disconnection, to reach efficient, high safety, frequency converter braking control effect that reliability is high.
Description of drawings
Fig. 1 is overall structure block diagram of the present utility model.
Fig. 2 is chopper circuit figure.
Fig. 3 is brake resistance testing circuit figure.
Fig. 4 is that braking ratio is selected circuit diagram.
Fig. 5 is that braking ratio selects circuit that as a result figure is set.
Embodiment
Fig. 1 is overall structure block diagram of the present utility model, and it comprises chopper circuit, resistance detecting circuit, master controller, braking ratio selection circuit, busbar voltage testing circuit and auxiliary power circuit.
Wherein the circuit diagram of chopper circuit as shown in Figure 2, comprise IGBT single tube module Q1, be connected with dc bus is anodal behind collector electrode differential concatenation the first diode D1 of IGBT single tube module Q1, the first diode D1 plays the afterflow effect, and the emitter of IGBT single tube module Q1 is connected with the dc bus negative pole; Reverse parallel connection the second diode D2 between the collector and emitter of IGBT single tube module Q1; The first diode D1 is in parallel with brake resistance R1; The grid of IGBT single tube module Q1 is controlled by the IGBT drive circuit by master controller; The second diode D2 two ends are the first capacitor C 1 in parallel also.Decide access and the disconnection of brake resistance after powering on by the break-make of control IGBT single tube module, when DC bus-bar voltage surpasses braking point voltage, the IGBT conducting, brake resistance directly was connected between the dc bus and discharged this moment, and the excess energy of regenerating in the motor braking process is consumed.
Described resistance detecting circuit is formed by connecting by discharge circuit and follow circuit, it comprises 2 inputs, first input end is connected with the collector electrode of IGBT single tube module, and the second input is connected with the dc bus negative pole, and the output of resistance detecting circuit is connected with described master controller; Resistance detecting circuit is 2 grades of amplifying circuits in the present embodiment, as shown in Figure 3.When IGBT single tube module was opened or turn-offed, correct if brake resistance connects, resistance detecting circuit then all can detect corresponding magnitude of voltage.If magnitude of voltage is inaccurate, then brake resistance does not connect correctly.This voltage with respect to the dc bus negative pole of the C utmost point (being collector electrode) can by amplifier U1 through computing, then be converted to weak electric signal through follow circuit and send into the master controller sample circuit.
Described braking ratio is selected circuit as shown in Figure 4, comprises toggle switch, and toggle switch is connected with the I/O port of described master controller.Select ON by toggle switch S1, the OFF position, S1-2, S1-3, S1-4 output to respectively the I/O mouth of master controller, and master controller can be judged the braking ratio that the user sets by the numerical value that reads the I/O mouth, and the control of being correlated with according to braking ratio.The result is set as shown in Figure 5.
The input of described busbar voltage testing circuit is connected with dc bus, and its output is connected with the I/O port of described master controller.Described auxiliary power circuit provides power supply for other each module, take the UC2844 chip as core.
Master controller receives the signal of busbar voltage testing circuit, braking ratio selection circuit, and calculate the parameters such as the output duty ratio of control signal and cycle, to export suitable control signal to chopper circuit, conducting or the disconnection of control IGBT single tube module are to reach the purpose of control brake resistance; And judge the access situation of brake resistance by resistance detecting circuit, guarantee the normal operation of brake resistance.
Should illustrate that at last enforcement of the present utility model is only unrestricted for the explanation technical scheme.Modification and replacement that all do not break away from the spirit and scope of technical solutions of the utility model all should be incorporated in the middle of the claim scope of the present utility model.The content that is not described in detail in the utility model specification belongs to the known prior art of this professional domain technical staff.
Claims (2)
1. intelligent type frequency-conversion device brake unit is characterized in that: it comprises that chopper circuit, resistance detecting circuit, master controller, braking ratio select circuit, busbar voltage testing circuit and auxiliary power circuit;
Wherein chopper circuit comprises IGBT single tube module, is connected with dc bus is anodal behind the collector electrode differential concatenation first diode D1 of IGBT single tube module, and the emitter of IGBT single tube module is connected with the dc bus negative pole; Reverse parallel connection the second diode D2 between the collector and emitter of IGBT single tube module; The first diode D1 is in parallel with brake resistance; The grid of IGBT single tube module is controlled by the IGBT drive circuit by master controller;
Described resistance detecting circuit is formed by connecting by discharge circuit and follow circuit, it comprises 2 inputs, first input end is connected with the collector electrode of IGBT single tube module, and the second input is connected with the dc bus negative pole, and the output of resistance detecting circuit is connected with described master controller;
Described braking ratio selects circuit to comprise toggle switch, and toggle switch is connected with the I/O port of described master controller;
The input of described busbar voltage testing circuit is connected with dc bus, and its output is connected with the I/O port of described master controller;
Described auxiliary power circuit provides power supply for other each module.
2. intelligent type frequency-conversion device brake unit according to claim 1, it is characterized in that: described the second diode D2 two ends are the first capacitor C 1 in parallel also.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220353605 CN202798440U (en) | 2012-07-20 | 2012-07-20 | Intelligent braking unit for inverters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220353605 CN202798440U (en) | 2012-07-20 | 2012-07-20 | Intelligent braking unit for inverters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202798440U true CN202798440U (en) | 2013-03-13 |
Family
ID=47825611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220353605 Expired - Lifetime CN202798440U (en) | 2012-07-20 | 2012-07-20 | Intelligent braking unit for inverters |
Country Status (1)
| Country | Link |
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| CN (1) | CN202798440U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441686A (en) * | 2013-09-04 | 2013-12-11 | 北京天诚同创电气有限公司 | Control system and method for braking module of DC busbars of wind-power current transformer |
| CN103532365A (en) * | 2013-10-25 | 2014-01-22 | 苏州汇川技术有限公司 | Brake unit |
| CN104779843A (en) * | 2015-04-09 | 2015-07-15 | 深圳市禾望电气股份有限公司 | Controllable brake unit, brake system and brake method |
| CN104935215A (en) * | 2015-06-05 | 2015-09-23 | 柳州弘天科技有限公司 | Braking unit |
| CN108768219A (en) * | 2018-08-22 | 2018-11-06 | 西门子工厂自动化工程有限公司 | Frequency converter braking circuit and frequency changer brake |
| CN111052582A (en) * | 2017-09-14 | 2020-04-21 | 西门子股份公司 | Frequency converter, frequency converter assembly and control method thereof |
-
2012
- 2012-07-20 CN CN 201220353605 patent/CN202798440U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441686A (en) * | 2013-09-04 | 2013-12-11 | 北京天诚同创电气有限公司 | Control system and method for braking module of DC busbars of wind-power current transformer |
| CN103441686B (en) * | 2013-09-04 | 2015-06-17 | 北京天诚同创电气有限公司 | Control system and method for braking module of DC busbars of wind-power current transformer |
| CN103532365A (en) * | 2013-10-25 | 2014-01-22 | 苏州汇川技术有限公司 | Brake unit |
| CN103532365B (en) * | 2013-10-25 | 2016-05-25 | 苏州汇川技术有限公司 | A kind of brake unit |
| CN104779843A (en) * | 2015-04-09 | 2015-07-15 | 深圳市禾望电气股份有限公司 | Controllable brake unit, brake system and brake method |
| CN104935215A (en) * | 2015-06-05 | 2015-09-23 | 柳州弘天科技有限公司 | Braking unit |
| CN111052582A (en) * | 2017-09-14 | 2020-04-21 | 西门子股份公司 | Frequency converter, frequency converter assembly and control method thereof |
| CN111052582B (en) * | 2017-09-14 | 2023-08-29 | 西门子股份公司 | Frequency converter, frequency converter assembly and control method of frequency converter assembly |
| CN108768219A (en) * | 2018-08-22 | 2018-11-06 | 西门子工厂自动化工程有限公司 | Frequency converter braking circuit and frequency changer brake |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130313 |
|
| CX01 | Expiry of patent term |