CN201860125U - Feedback system with relief device - Google Patents
Feedback system with relief device Download PDFInfo
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- CN201860125U CN201860125U CN2010205895015U CN201020589501U CN201860125U CN 201860125 U CN201860125 U CN 201860125U CN 2010205895015 U CN2010205895015 U CN 2010205895015U CN 201020589501 U CN201020589501 U CN 201020589501U CN 201860125 U CN201860125 U CN 201860125U
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- feedback system
- bleeder
- electrically connects
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- output
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Abstract
The utility model relates to a feedback system with a relief device. The feedback system comprises an input end of the feedback system and a relief device, wherein the input end of the feedback system is provided with a positive input terminal and a negative input terminal and the relief device is used for reliving partial electric energy; the relief device comprises a resistor and a control switch connected with the resistor; the resistor is electrically connected with the positive input terminal of the input end of the feedback system; and the control switch is electrically connected with the negative input terminal of the input end of the feedback system. The relief device can be used for relieving the electric energy exceeding the rated capacity of the feedback device, therefore, the entire feedback system is safer and the integral cost of the system can be lowered.
Description
Technical field
The utility model relates to field of power supplies, particularly a kind of feedback system with bleeder.
Background technology
Frequency converter generally includes rectification unit that is connected with electrical network and the inversion unit that is connected with motor, rectification unit is used for three-phase alternating current is rectified into direct current, inversion unit is used for the dc inverter of rectification unit output is become the alternating current of frequency adjustable, realizes frequency control to drive motor.And when the potential energy load of motor deceleration or institute's transmission is transferred, when this moment, motor speed was greater than frequency converter output synchronous speed, mechanical energy stored in the drive system is converted to electric energy through asynchronous motor, this moment, motor was in generating state, six feedback diodes of frequency converter inversion unit feed back to DC side with this electric energy, cause frequency changer direct current bus voltage to raise and can't operate as normal.So frequency changer direct current bus voltage is remained in the normal range (NR), must handle to these energy.
Further, use feedback unit to come these energy are handled in the existing design.Yet feedback unit also can only be handled its specified energy, can't handle for too much energy.A kind of processing mode is the hardware configuration that increases feedback unit, increases the rated energy that feedback unit can be handled.But this mode then can increase the cost of system.When if the energy that feedback unit need be handled is too much, then can cause the insecurity of system.
The utility model content
The technical problems to be solved in the utility model provides a kind of feedback system with bleeder, and it can be released the excess energy in the feedback system, makes circuit system safety and can reduce the whole cost of frequency converter application system.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is for providing a kind of feedback system with bleeder, comprise the release bleeder of part electric energy of the feedback system input and with positive and negative input terminal, described bleeder comprises a resistance and a control switch that is connected with described resistance, the positive input terminal of described resistance and described feedback system input electrically connects, and negative input end of described control switch and described feedback system input electrically connects.
Further, described feedback system also comprises a control circuit, first end of described control switch and described resistance electrically connect, and second end of control switch and the negative input end of feedback system input electrically connect, and the control end of control switch and control circuit electrically connect.
Further, described feedback system also comprises an inversion unit that electrically connects with described bleeder, and described inversion unit comprises six switching tubes.
Further, described feedback system also comprises at least one out put reactor, and each out put reactor is connected between the output of the output of described inversion unit and feedback system.
Further, described feedback system also comprises an output capacitance filter, described output capacitance filter comprises three electric capacity, and an end of described three electric capacity electrically connects mutually, and the other end of described three electric capacity electrically connects with three lead-out terminals of feedback system output respectively.
The useful technique effect of the feedback system of the utility model band bleeder is: when described feedback system reaches its rated capacity, described bleeder is used for releasing above feedback system rated capacity electric energy partly, make that whole feedback system is safer, and can reduce the entire system cost.
Description of drawings
Fig. 1 is the feedback system of the utility model band bleeder and the wiring schematic diagram that frequency converter is used;
Fig. 2 is the circuit theory diagrams of the feedback system of the utility model band bleeder.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in further detail:
Be illustrated in figure 1 as the feedback system 2 of the utility model band bleeder and the wiring schematic diagram that frequency converter 1 is used.The feedback system of the utility model band bleeder not only is applied on the frequency converter.Two inputs of feedback system 2 link to each other with the positive and negative electrode of the dc bus 12 of frequency converter 1, and the output of feedback system 2 links to each other with the input of frequency converter 1, and the input of frequency converter 1 links to each other with electrical network.The motor 3 that is driven when frequency converter 1 slows down, and when motor 3 rotating speeds are exported synchronous speed greater than frequency converter 1, motor 3 is in generating state, six feedback diodes (not shown) of frequency converter 1 inversion unit 11 feed back to this electric energy the dc bus 12 of frequency converter 1, frequency changer direct current bus 12 voltages raise, when the voltage that active feedback system 2 detects dc bus 12 is higher than set point, starts its inner inversion unit 21 electric energy on frequency converter 1 dc bus 12 is fed back to electrical network.Described feedback system 2 is connected in parallel with rectification unit.
Fig. 2 is the circuit theory diagrams of the utility model feedback system 2, as shown in the figure, this active feedback system comprises: feedback system input 20, input filter unit 21, inversion unit 22, control circuit 23, output filter unit 24, feedback system output 25 and bleeder 26.
Described feedback system input 20 has two input terminal P, N (being positive and negative input terminal), and this two input terminal P, N electrically connect with the anode and the negative terminal of the dc bus of frequency converter 1 respectively; Described feedback system output 25 comprises three lead-out terminal R, S, T, and each lead-out terminal R, S, T electrically connect with each input of motor respectively.
Described input filter unit 21 is connected in parallel between input terminal P, the N, and with the impacting with high pressure of buffering frequency changer direct current bus, the inversion unit 22 of protection rear end prevents that it is broken down by high-voltage.This input filter unit 21 adopts capacitive filter, this capacitive filter can be the electric capacity of one or more serial or parallel connections or series-parallel connection and forms, in the present embodiment, input filter unit 21 comprises filter capacitor C1, the C2 of two series connection, the end of filter capacitor C1 and input terminal P electrically connect, the end of the other end of filter capacitor C1 and filter capacitor C2 electrically connects, and the other end of filter capacitor C2 and input terminal N electrically connect.In other embodiments, can require according to the model of this active feedback system corresponding string or and a plurality of electric capacity, inferior place repeats no more.
The circuit structure and the operation principle of the inversion unit 22 of the circuit structure of described inversion unit 22 and operation principle and common frequency converter are basic identical, and it is used for the direct current of feedback system input 20 inputs is converted into the alternating current identical with mains frequency.This inversion unit 22 comprises six controlled thyristor or has six switching tube G1, G2, G3, G4, G5, the IGBT of G6 (Insulated Gate Bipolar Transistor, three bipolar-type power pipes insulate), switching tube G1, G3, the collector electrode of G5 all electrically connects with input terminal P, each switching tube G1, G3, each emitter of G5 respectively with each switching tube G2, G4, the collector electrode of G6 electrically connects, switching tube G2, G4, the emitter of G6 all electrically connects with input terminal N, switching tube G1, G2, G3, G4, G5, the difference grid of G6 and the output driver element of control circuit 23 231 electrically connect.
Described bleeder 26 comprises that one is connected in parallel on resistance R between input terminal P, the N and the IGBT of a control switch G7, the collector electrode of switching tube G7 (first end) electrically connects with an end of resistance R, emitter (second end) electrically connects with input terminal N, and grid (control end) electrically connects with the output driver element 231 of control circuit 23.The other end of described resistance R and input terminal P electrically connect.Described bleeder 26 electrically connects with described inversion unit.Described bleeder 26 is used for releasing above the electric energy of feedback device rated capacity part, promptly when in the described feedback system 2 too much electric energy being arranged, by described bleeder 26 it is released.
Described output filter unit 24 comprises filter reactor 240 and filter capacitor 241, in the present embodiment, the quantity of filter reactor 240 is three, and each filter reactor 240 is connected on respectively between each output and feedback system lead-out terminal R, S or T of inversion unit 22; The quantity of filter capacitor 241 is three, be respectively filter capacitor C1, C2, C3, the end of each filter capacitor C1, C2, C3 electrically connects mutually, and the other end of each filter capacitor C1, C2, C3 electrically connects with three lead-out terminal R, S of feedback system output 25, T respectively.
Described control circuit 23 comprises direct voltage detecting unit 230, output driver element 231 and SPWM pwm unit 232.Direct voltage detecting unit 230 electrically connects with feedback system input 20 and SPWM pwm unit 232, SPWM pwm unit 232 electrically connects with output driver element 231, and the grid of each switching tube G1, G2 of output driver element 231 and inversion unit 22, G3, G4, G5, G6 electrically connects.Direct voltage detecting unit 230 preestablishes a threshold voltage, and this threshold voltage can be set with reference to the threshold voltage of frequency converter 1 on-position.SPWM pwm unit 232 produces six road SPWM pulse width modulated waves, and by output driver element 231 this six road SPWM pulse width modulated wave signal is amplified, and is used to drive each switching tube conducting or shutoff of inversion unit 22.Its operation principle is: when the voltage that detects frequency converter 1 dc bus 12 when direct voltage detecting unit 230 is higher than threshold voltage, show that promptly frequency converter 1 is in on-position, at this moment, make SPWM pwm unit 232 to output driver element 231 outputs six road SPWM pulse width modulated waves, and by exporting each switching tube conducting or shutoff of driver element 231 driving inversion units 22, thereby realize converting the direct current on the dc bus 22 of frequency converter 1 when the on-position to alternating current, and feed back to electrical network.
Synchronous in order to guarantee that active feedback system 2 feeds back to the alternating current phases of the alternating current of electrical network and electrical network self, the control circuit 23 of this active feedback system 2 also is provided with an electrical network phase detection unit 235 and a synchronous control unit 234.This electrical network phase detection unit 235 electrically connects with feedback system output 25 and synchronous control unit 234, and this synchronous control unit 234 electrically connects with SPWM pwm unit 232.The current phase place of these electrical network phase detection unit 235 detection of grid also outputs to synchronous control unit 234 with the current phase place of electrical network, the SPWM pulse width modulated wave of synchronous control unit 234 regulation and control SPWM pwm units 232 outputs, make the current Phase synchronization of itself and electrical network, thereby make that the alternating current and the grid alternating current of inversion unit 22 outputs are synchronous, avoid causing the line voltage shakiness because of the output AC electricity of active feedback system 2 is asynchronous with grid alternating current or upsetting.
In addition, the control circuit 23 of this active feedback system 2 is established has a feedback current control unit 233, and itself and direct voltage detecting unit 230, described SPWM pwm unit 232 and synchronous control unit 234 electrically connect.It detects the operating current of control circuit 23, when the operating current of this control circuit 23 is higher than set point, close the SPWM pulse width modulated wave output of SPWM pwm unit 232, thereby turn-off each switching tube G1, G2, G3, G4, G5, the G6 of inversion unit 22, prevent that each switching tube G1, G2, G3, G4, G5, the G6 of inversion unit 22 is excessive and breakdown because of electric current.Feedback system of the present utility model not only is applied in the frequency converter, can also be applied to other aspects.
The above; only be the preferable feasible embodiment of the utility model; can not therefore promptly limit to interest field of the present utility model; concerning being familiar with those of ordinary skill in the art; such as use the technical solution of the utility model and technical conceive to make other various corresponding changes and distortion, and all these changes and distortion all should belong in the protection range of the utility model claim.
Claims (5)
1. feedback system with bleeder, it is characterized in that, described feedback system comprises the release bleeder of part electric energy of the feedback system input and with positive and negative input terminal, described bleeder comprises a resistance and a control switch that is connected with described resistance, the positive input terminal of described resistance and described feedback system input electrically connects, and negative input end of described control switch and described feedback system input electrically connects.
2. the feedback system of band bleeder as claimed in claim 1, it is characterized in that, described feedback system also comprises a control circuit, first end of described control switch and described resistance electrically connect, second end of control switch and the negative input end of feedback system input electrically connect, and the control end of control switch and control circuit electrically connect.
3. the feedback system of band bleeder as claimed in claim 1 is characterized in that, described feedback system also comprises an inversion unit that electrically connects with described bleeder, and described inversion unit comprises six switching tubes.
4. the feedback system of band bleeder as claimed in claim 3 is characterized in that, described feedback system also comprises at least one out put reactor, and each out put reactor is connected between the output of the output of described inversion unit and feedback system.
5. the feedback system of band bleeder as claimed in claim 1, it is characterized in that, described feedback system also comprises an output capacitance filter, described output capacitance filter comprises three electric capacity, one end of described three electric capacity electrically connects mutually, and the other end of described three electric capacity electrically connects with three lead-out terminals of feedback system output respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205895015U CN201860125U (en) | 2010-11-02 | 2010-11-02 | Feedback system with relief device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205895015U CN201860125U (en) | 2010-11-02 | 2010-11-02 | Feedback system with relief device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201860125U true CN201860125U (en) | 2011-06-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205895015U Expired - Lifetime CN201860125U (en) | 2010-11-02 | 2010-11-02 | Feedback system with relief device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201860125U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019051718A1 (en) * | 2017-09-14 | 2019-03-21 | 西门子公司 | Frequency converter, frequency converter assembly, and control method thereof |
-
2010
- 2010-11-02 CN CN2010205895015U patent/CN201860125U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019051718A1 (en) * | 2017-09-14 | 2019-03-21 | 西门子公司 | Frequency converter, frequency converter assembly, and control method thereof |
| US11637503B2 (en) | 2017-09-14 | 2023-04-25 | Siemens Aktiengesellschaft | Frequency converter, frequency converter assembly, and control method thereof |
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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 | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110608 |