CN206250750U - transducer brake unit protection circuit - Google Patents
transducer brake unit protection circuit Download PDFInfo
- Publication number
- CN206250750U CN206250750U CN201620976897.6U CN201620976897U CN206250750U CN 206250750 U CN206250750 U CN 206250750U CN 201620976897 U CN201620976897 U CN 201620976897U CN 206250750 U CN206250750 U CN 206250750U
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- comparator
- circuit
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- brake unit
- phase input
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Abstract
The utility model discloses a kind of transducer brake unit protection circuit; including reference circuit and comparison circuit, the reference voltage that comparison circuit is provided according to reference circuit connects whether cut-out IGBT drive circuit is worked with driving and braking units with frequency converter busbar voltage comparative result control.The utility model protection brake unit avoids hot operation from damaging.
Description
Technical field
The utility model is related to frequency converter brake field, more particularly to a kind of transducer brake unit protection circuit.
Background technology
Brake unit, also known as " frequency converter tailored version dynamic braking unit ", are one kind of frequency converter tailored version brake unit,
It is mainly used in the frequency conversion speed-adjusting system that large inertia loaded, required fast braking, when motor in the presence of external force when slowing down,
Motor is run with generating state, produces regeneration energy to cause DC bus-bar voltage to raise, to ensure that frequency converter is not damaged by high pressure,
Brake unit is consumed unnecessary regenerative electric energy in the form of energy consumption, to reach the purpose of protection frequency converter.
Brake unit can produce amount of heat in itself when working, if its working frequency is too high, heat does not have time enough
Disperse along with outside environmental elements may make its temperature rapid increase, when temperature it is taller and bigger in 80 degrees Celsius when brake unit after
Continuous work will likely be damaged, and to avoid this case from occurring, seem necessary plus heat protection function to brake unit.
The content of the invention
The utility model provides a kind of transducer brake unit protection circuit, prevents brake unit from being damaged because temperature rise is too high
It is bad.
To realize above technical purpose, the utility model uses following technical scheme：
Transducer brake unit protection circuit, including reference circuit and comparison circuit, comparison circuit are carried according to reference circuit
The reference voltage of confession connects cut-out IGBT drive circuit to drive braking single with frequency converter busbar voltage comparative result control
Whether unit works；Wherein, the comparison circuit includes first comparator and the second comparator,
The in-phase input end of first comparator connects the frequency converter bus, the inverting input connection institute of first comparator
Reference circuit is stated for providing the output end of the reference voltage, the in-phase input end of the first comparator is by the first filtering
Capacity earth, the output end of first comparator connects the input of the IGBT drive circuit；
The output end of first comparator connects the anode of the first diode, and the output end of the second comparator connects the one or two pole
The negative electrode of pipe；The first common port connection first between the input of the output end of first comparator and the IGBT drive circuit
One end of resistance, the other end of first resistor connects a VCC power supplys；
The in-phase input end of the second comparator connects one end of a negative tempperature coefficient thermistor, the second comparator it is anti-phase
Input connects the reference circuit is used to provide the output end of the reference voltage, and second resistance and the second Diode series are used
With unidirectional sluggish second comparator, one end of second resistance connects the in-phase input end of the second comparator, the moon of the second diode
Pole connects the output end of the second comparator；The in-phase input end of the second comparator is grounded by the second filter capacitor, the subzero temperature
Spend the other end ground connection of coefficient resistance；Between the in-phase input end of the negative tempperature coefficient thermistor and the second comparator
The second common port connect one end of 3rd resistor, the other end of 3rd resistor connects the 2nd VCC power supplys.
Used as the improvement of such scheme, the output end of second comparator is also connected with a warning circuit.
Preferably, a VCC power supplys are 20V, and the 2nd VCC power supplys are 15V.
Beneficial effect
The utility model compares frequency converter busbar voltage and reference voltage to control IGBT to drive electricity by first comparator
Road, compares the voltage and reference voltage of thermistor to perceive the change of heat produced by brake unit by the second comparator,
And the output voltage of first comparator output end is controlled to control to switch on or off IGBT drives according to the second comparator comparative result
Dynamic circuit, protection brake unit avoids hot operation from damaging.
Brief description of the drawings
Fig. 1 is the structural representation of the transducer brake unit protection circuit that the utility model embodiment 1 is provided；
Fig. 2 is the structural representation of the transducer brake unit protection circuit that the utility model embodiment 2 is provided；
Fig. 3 is the structural representation of the transducer brake unit protection circuit that the utility model embodiment 3 is provided.
Specific embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe.
It is the transducer brake unit protection circuit structural representation of the offer of the utility model embodiment 1 referring to Fig. 1.
Transducer brake unit protection circuit, including reference circuit 2 and comparison circuit 3, comparison circuit 3 is according to reference circuit
2 reference voltages for providing connect cut-out IGBT drive circuit 4 with the control of the busbar voltage comparative result of the frequency converter 1 to drive system
Whether moving cell 5 works.
It is the transducer brake unit protection circuit structural representation of the offer of the utility model embodiment 2 referring to Fig. 2.
Transducer brake unit protection circuit, including reference circuit 2 and comparison circuit 3, comparison circuit 3 is according to reference circuit
2 reference voltages for providing connect cut-out IGBT drive circuit 4 with the control of the busbar voltage comparative result of the frequency converter 1 to drive system
Whether moving cell 5 works.
Comparison circuit 3 includes first comparator U1C and the second comparator U1D,
The connection bus of frequency converter 1 of in-phase input end 8 of first comparator U1C, the inverting input 9 of first comparator U1C
Connection reference circuit 2 is used to provide the output end of the reference voltage V ref, and the in-phase input end 8 of first comparator U1C passes through
First filter capacitor C9 is grounded, and the output end 14 of first comparator U1C connects the input of IGBT drive circuit 4；First compares
The output end 14 of device U1C connects the anode of the first diode D4, and the output end 13 of the second comparator U1D connects the first diode D4
Negative electrode；The first common port connection pull-up between the output end 14 of first comparator U1C and the input of IGBT drive circuit 4
One end of resistance R42, the other end of pull-up resistor R42 connects a VCC power supplys；
The in-phase input end TEMP of the second comparator U1D connects one end of a negative tempperature coefficient thermistor R0, the second ratio
Inverting input compared with device U1D connects the reference circuit 2 is used to provide the output end 10 of the reference voltage V ref, the second electricity
Resistance R21 and the second diode D5 series connection is compared to unidirectional sluggish second comparator U1D, one end connection second of second resistance R21
The negative electrode of in-phase input end TEMP, the second diode D5 compared with device U1D connects the pin of output end 13 of the second comparator U1D；Second
The in-phase input end TEMP of comparator U1D is grounded by the second filter capacitor C4, the other end of negative tempperature coefficient thermistor R0
Ground connection；The second common port connection between the in-phase input end TEMP of negative tempperature coefficient thermistor R0 and the second comparator U1D
One end of divider resistance R41, the other end of divider resistance R41 connects the 2nd VCC power supplys.
The first VCC power supplys are 20V, and the 2nd VCC power supplys are 15V.
In the present embodiment, the busbar voltage VIN of the bus input 8 of the frequency converter 1 is anti-more than first comparator U1C
The reference voltage V ref of phase input 9, turns on optocoupler prime in IGBT drive circuit 4 and drives IGBT drive circuit 4 to export, and makes
Brake unit 6 is obtained to work；The in-phase input end of the second comparator U1D is temperature acquisition signal TEMP pin, when the temperature of brake unit 6
During rising, negative tempperature coefficient thermistor R0 resistances reduce, and the in-phase input end TEMP pin voltage of the second comparator U1D also with
Reduction, until the second comparator U1D in-phase input end TEMP pin voltage less than the second comparator U1D inverting input 10
Reference voltage V ref when, the second comparator U1D output ends 13 output low level, so as to drag down first comparator U1C output ends
The voltages of 14 outputs, the prime of optocoupler in shut-off IGBT drive circuit 4 and cut off the output of IGBT drive circuit 4 so that braking
Unit 6 is stopped, it is to avoid the too high damage brake unit that works on of temperature.
It is the transducer brake unit protection circuit structural representation of the offer of the utility model embodiment 3 referring to Fig. 3.Should
Transducer brake unit protection circuit is based on embodiment 2, and its difference is that the output end of second comparator is also connected with
One warning circuit 6, when the temperature rise of temperature rise brake unit 6 is too high, causes the second comparator U1D output ends 13 to export low level, triggering
Warning circuit 6 is alarmed.
The above is preferred embodiment of the present utility model, it is noted that for the ordinary skill of the art
For personnel, on the premise of the utility model principle is not departed from, some improvements and modifications can also be made, these improve and moisten
Decorations are also considered as protection domain of the present utility model.
Claims (3)
1. transducer brake unit protection circuit, it is characterised in that including reference circuit and comparison circuit, comparison circuit is according to base
The reference voltage that quasi- circuit is provided connects cut-out IGBT drive circuit with frequency converter busbar voltage comparative result control to drive
Whether dynamic brake unit works；
Wherein, the comparison circuit includes first comparator and the second comparator,
The in-phase input end of first comparator connects the frequency converter bus, and the inverting input of first comparator connects the base
Quasi- circuit is used to provide the output end of the reference voltage, and the in-phase input end of the first comparator passes through the first filter capacitor
Ground connection, the output end of first comparator connects the input of the IGBT drive circuit；The output end connection the of first comparator
The anode of one diode, the output end of the second comparator connects the negative electrode of the first diode；The output end of first comparator and institute
State one end that the first common port between the input of IGBT drive circuit connects pull-up resistor, the other end connection of pull-up resistor
First VCC power supplys；
The in-phase input end of the second comparator connects one end of a negative tempperature coefficient thermistor, the anti-phase input of the second comparator
The end connection reference circuit is used to provide the output end of the reference voltage, and second resistance and the second Diode series are to single
To sluggish second comparator, one end of second resistance connects the in-phase input end of the second comparator, and the negative electrode of the second diode connects
Connect the output end of the second comparator；The in-phase input end of the second comparator is grounded by the second filter capacitor, the negative temperature system
The other end ground connection of number thermistor；Between the in-phase input end of the negative tempperature coefficient thermistor and the second comparator
Two common ports connect one end of divider resistance, and the other end of divider resistance connects the 2nd VCC power supplys.
2. transducer brake unit protection circuit as claimed in claim 1, it is characterised in that the output of second comparator
End is also connected with a warning circuit.
3. transducer brake unit protection circuit as claimed in claim 1, it is characterised in that a VCC power supplys are
20V, the 2nd VCC power supplys are 15V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620976897.6U CN206250750U (en) | 2016-08-29 | 2016-08-29 | transducer brake unit protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620976897.6U CN206250750U (en) | 2016-08-29 | 2016-08-29 | transducer brake unit protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206250750U true CN206250750U (en) | 2017-06-13 |
Family
ID=58998615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620976897.6U Active CN206250750U (en) | 2016-08-29 | 2016-08-29 | transducer brake unit protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206250750U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107394746A (en) * | 2017-09-13 | 2017-11-24 | 广东美的暖通设备有限公司 | A kind of protection circuit with return difference |
-
2016
- 2016-08-29 CN CN201620976897.6U patent/CN206250750U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107394746A (en) * | 2017-09-13 | 2017-11-24 | 广东美的暖通设备有限公司 | A kind of protection circuit with return difference |
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