CN219802153U - Frequency converter brake circuit - Google Patents
Frequency converter brake circuit Download PDFInfo
- Publication number
- CN219802153U CN219802153U CN202321322686.7U CN202321322686U CN219802153U CN 219802153 U CN219802153 U CN 219802153U CN 202321322686 U CN202321322686 U CN 202321322686U CN 219802153 U CN219802153 U CN 219802153U
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- circuit
- resistor
- operational amplifier
- brake
- frequency converter
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- 239000003990 capacitor Substances 0.000 claims abstract description 13
- 230000001629 suppression Effects 0.000 claims description 6
- 230000001052 transient effect Effects 0.000 claims description 6
- 239000003381 stabilizer Substances 0.000 claims description 3
- 229910044991 metal oxide Inorganic materials 0.000 description 6
- 150000004706 metal oxides Chemical class 0.000 description 6
- 239000004065 semiconductor Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 101001051799 Aedes aegypti Molybdenum cofactor sulfurase 3 Proteins 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Abstract
The utility model discloses a frequency converter braking circuit, which comprises a power supply conversion circuit, a comparison circuit and a control circuit, wherein the power supply conversion circuit is used for acquiring bus voltage and uploading the bus voltage to the comparison circuit; the comparator circuit is used for comparing the bus voltage with the reference voltage and then outputting a level signal to the brake driving circuit; and a brake driving circuit for selecting whether to perform a consumption operation on the voltage increment according to the level signal. The frequency converter braking circuit compares the comparator with a reference voltage, a comparator output signal is sent to a braking driving optocoupler, the driving optocoupler directly drives a braking switch tube IGBT, an external braking resistor is connected into a direct current loop to consume voltage increment, and a power resistor discharges redundant electric energy to prevent overvoltage damage to a main filter capacitor and the IGBT.
Description
Technical Field
The utility model relates to the technical field of frequency converters, in particular to a frequency converter braking circuit.
Background
A Variable-frequency Drive (VFD) is a power control device that applies a frequency conversion technique and a microelectronics technique to control an ac motor by changing a frequency of a motor operating power supply. The frequency converter mainly comprises a rectifying unit (alternating current to direct current), a filtering unit, an inverting unit (direct current to alternating current), a braking unit, a driving unit, a detecting unit micro-processing unit and the like. The frequency converter is used for adjusting the voltage and frequency of the output power supply by switching on and off the internal IGBT, and providing the required power supply voltage according to the actual requirement of the motor, so as to achieve the purposes of energy saving and speed regulation. Along with the continuous improvement of the industrial automation degree, the frequency converter is also widely applied.
When the frequency converter works, due to inertia, the rotating speed of the motor is larger than the output rotating speed of the frequency converter, and the motor enters a power generation state from an electric state at the moment, so that the motor temporarily becomes a generator, and the voltage of a direct-current loop is increased by rectifying and superposing diodes in an IGBT module of the frequency converter on a direct-current bus, so that overvoltage damage is caused to a main filter capacitor and the IGBT.
Disclosure of Invention
The utility model aims to provide a frequency converter braking circuit.
In order to achieve the above purpose, the present utility model provides the following technical solutions: a frequency converter braking circuit comprising:
the power supply conversion circuit is used for acquiring bus voltage and uploading the bus voltage to the comparison circuit;
the comparator circuit is used for comparing the bus voltage with the reference voltage and then outputting a level signal to the brake driving circuit; and
and the brake driving circuit is used for selecting whether to perform consumption operation on the voltage increment according to the level signal.
Further, the power conversion circuit includes resistors R5, R6, R7, R8, R9, 10, R11, R13, R14, R15, R16, R17, R18, R19, R20, R3, R21, R4, capacitors C2, C6, clamping diodes D1, D2, and an operational amplifier U2A, the resistors R3, R4, and C6 are connected in parallel, one end of the resistor R3 is connected with the R4 and then connected to the output end of the operational amplifier U2A, the other end of the resistor R3 is connected to the negative phase input end of the operational amplifier U2A, the resistors R5, R6, R7, R8, R9, R10, R11 are connected between the resistor R3 and the operational amplifier U2A through the clamping diode D1 after being sequentially connected in series, the resistors R13, R14, R15, R16, R17, R18, R19 are sequentially connected in series and then connected to the positive phase input end of the operational amplifier U2A through the clamping diode D2, and the other end of the resistor R20 is connected between the resistor R20 and one end of the resistor C6 and the other end of the resistor R20.
Further, the models of the clamping diodes D1 and D2 are LMBD7000LT1G.
Further, the model number of the operational amplifier U2A is TL082A.
Further, the comparator circuit comprises a chip U1 and an operational amplifier U2B, wherein the output end of the chip U1 is connected with the positive phase input end of the operational amplifier U2B, and the negative phase input end of the operational amplifier U2B is connected with the power supply conversion circuit.
Further, the operational amplifier U2B is model TL082A.
Further, the chip U1 is a voltage stabilizer, and the model of the chip U1 is TL431AIDBZR.
Further, the brake driving circuit comprises a driving optocoupler U3, a transient suppression diode TVS1, a resistor R22, a brake resistor Rbrk and a MOS tube MK1, wherein the driving optocoupler U3 is connected with the output end of the operational amplifier U2B, the output end of the driving optocoupler U3 is connected with the 2 pin of the MOS tube MK1, the resistor R22 is connected in parallel with the transient suppression diode TVS1 and then connected between the driving optocoupler U3 and the MOS tube MK1, and the brake resistor Rbrk is connected with the 3 pin of the MOS tube MK 1.
Further, the model of the MOS tube MK1 is LXA60IF1200NA.
Further, the driving optocoupler U3 is a photo coupler, and the model is TLP350.
According to the technical scheme, the utility model has the following beneficial effects:
the frequency converter braking circuit compares the comparator with a reference voltage, a comparator output signal is sent to a braking driving optocoupler, the driving optocoupler directly drives a braking switch tube IGBT, an external braking resistor is connected into a direct current loop to consume voltage increment, and a power resistor discharges redundant electric energy to prevent overvoltage damage to a main filter capacitor and the IGBT.
Drawings
FIG. 1 is a circuit diagram of a power conversion circuit of the present utility model;
FIG. 2 is a circuit diagram of a comparator according to the present utility model;
fig. 3 is a diagram of a brake driving circuit according to the present utility model.
Detailed Description
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be configured and operated in the specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "provided," "connected," and the like are to be construed broadly, and may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The utility model provides a frequency converter braking circuit which comprises a power supply conversion circuit, a comparator circuit and a braking driving circuit. As shown in fig. 1, the power conversion circuit includes resistors R5, R6, R7, R8, R9, 10, R11, R13, R14, R15, R16, R17, R18, R19, R20, R3, R21, R4, capacitors C2, C6, clamping diodes D1, D2, and an operational amplifier U2A, the resistors R3, R4, and C6 are connected in parallel, one end of the resistor R3 is connected to the output end of the operational amplifier U2A after being connected to the R4, the other end of the resistor R3 is connected to the negative phase input end of the operational amplifier U2A, the resistors R5, R6, R7, R8, R9, 10, R11 are connected between the resistor R3 and the operational amplifier U2A through a clamping diode D1 after being sequentially connected in series, the resistors R13, R14, R15, R16, R17, R18, R19 are connected in series after being sequentially connected to the positive phase input end of the operational amplifier U2A through a clamping diode D2, and the other end of the resistor R20 is connected between the resistor C20 and one end of the resistor C6 and the other end of the resistor R20. Wherein R5, R6, R7, R8, R9, 10, R11, R13, R14, R15, R16, R17, R18 and R19 are current limiting resistors, the clamping diodes D1 and D2 clamp the voltage within + -15V so as not to damage the operational amplifier U2A, the clamping diodes D1 and D2 are both LMBD7000LT1G, and the operational amplifier U2A is TL082A. The circuit has a magnification of (r3+r4)/(r5+r6+r7+r8+r9+r10+r11) = 0.00312462, and the 8OOV input corresponds to 2.5V output, and GENER is a bus voltage sampling signal. And acquiring bus voltage through a power supply conversion circuit and uploading the bus voltage to a comparison circuit.
The comparator circuit comprises a chip U1, an operational amplifier U2B, resistors R2 and R1 and a capacitor C4. One end of the capacitor C4 is connected with a positive-phase input end of the operational amplifier U2B, one end of the resistor R2 is connected with the 1 pin of the chip U1 and then connected between the capacitor C4 and the operational amplifier U2B, one end of the resistor R1 is connected between the R2 and the chip U1, the 2 pin of the chip U1 is connected between the resistor R2 and the resistor R1, a negative-phase input end of the operational amplifier U2B is connected with a power supply conversion circuit, the chip U1 is a voltage stabilizer, the model of the chip U1 is TL431AIDBZR, and the model of the operational amplifier U2B is TL082A. The chip U1 outputs a 2.5V reference voltage, and when the bus voltage is greater than 800V, the operational amplifier U2B outputs a low level to the brake driving circuit.
The braking driving circuit comprises a driving optocoupler U3, a current limiting resistor R26, a pull-up resistor R24, a turn-off resistor R23, a turn-on resistor R25, decoupling capacitors C7 and C9, a filter capacitor C8, diodes D3 and D4, a freewheeling diode D3, a transient suppression diode TVS1, a resistor R22, a braking resistor Rbrk and a MOS (metal oxide semiconductor) MK1, wherein the model of the MOS (metal oxide semiconductor) MK1 is LXa60IF1200NA, the driving optocoupler U3 is a photoelectric coupler, the model is TLP350, the driving optocoupler U3 is connected with the output end of an operational amplifier U2B, one end of the pull-up resistor R24 is connected with the current limiting resistor R26 and then connected between the driving optocoupler U3 and the operational amplifier U2B, the driving optocoupler U3 is connected with the 2 foot of the MOS (metal oxide semiconductor) MK1 through the turn-on resistor R25, the cathode of the diode D4 is connected with the turn-off resistor R23 and then connected between the driving optocoupler U3 and the MOS (metal oxide semiconductor) MK1, the anode of the driving optocoupler D4 is connected between the MOS (metal oxide semiconductor) MK1 and the MOS (metal oxide semiconductor) MK 1) and the cathode after the cathode of the pull-up resistor R22 is connected with the diode R3 is connected with the cathode of the MOS 3. The transient suppression diode TVS1 controls the driving voltage within +16V, the resistor R22 consumes the voltage increment of the TVS1, the brake resistor Rbrk is connected between P+ and PB, P+ is externally connected with the brake resistor, and when the BRK signal is in a high level, the 6 pin and the 7 pin of the driving optocoupler U3 output to be negative values; when BRK is a low-level signal, the primary side light emitting diode of the driving optocoupler U3 is conducted, the secondary side of the optocoupler is conducted, the pin 7 has a driving voltage of about 15V, the pins 3 and 1 of the MOS tube MK1 are conducted, PB is connected with GND_VNP, and the brake resistor Rbrk consumes voltage increment. The pull-up resistor R24 prevents the false triggering of braking, and the turn-off resistor R23 and the turn-on resistor R25 can be turned off by the braking module.
When the DC voltage of the direct current loop is within the normal range (450V-800V), the brake circuit is not operated, the change of the DC of the direct current loop is detected, when the motor reversely generates electricity and the DC voltage is increased to be higher than a certain brake action threshold value (800V), a comparator is used for comparing with a reference voltage, the output signal of the comparator is sent to a brake driving optocoupler, the brake switching tube IGBT is directly driven by the driving optocoupler, and an external brake resistor is connected into the direct current loop to consume the voltage increment.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A frequency converter braking circuit, comprising:
the power supply conversion circuit is used for acquiring bus voltage and uploading the bus voltage to the comparison circuit;
the comparator circuit is used for comparing the bus voltage with the reference voltage and then outputting a level signal to the brake driving circuit; and
and the brake driving circuit is used for selecting whether to perform consumption operation on the voltage increment according to the level signal.
2. A transducer braking circuit according to claim 1, wherein: the power conversion circuit comprises resistors R5, R6, R7, R8, R9, 10, R11, R13, R14, R15, R16, R17, R18, R19, R20, R3, R21, R4, capacitors C2 and C6, clamping diodes D1 and D2 and an operational amplifier U2A, wherein the resistors R3, R4 and the capacitor C6 are connected in parallel, one end of the resistor R3 is connected with the R4 and then connected with the output end of the operational amplifier U2A, the other end of the resistor R3 is connected with the negative phase input end of the operational amplifier U2A, the resistors R5, R6, R7, R8, R9, R10 and R11 are connected between the resistor R3 and the operational amplifier U2A through the clamping diode D1 after being connected in series in sequence, the resistors R13, R14, R15, R16, R17, R18 and R19 are connected with the positive phase input end of the operational amplifier U2A through the clamping diode D2 after being connected in series in sequence, and the other end of the resistor R20 is connected with the capacitor C6, and then connected with the other end of the resistor R20 is connected with the resistor C6.
3. A transducer braking circuit according to claim 2, wherein: the model numbers of the clamping diodes D1 and D2 are LMBD7000LT1G.
4. A transducer braking circuit according to claim 2, wherein: the model number of the operational amplifier U2A is TL082A.
5. A transducer braking circuit according to claim 1, wherein: the comparator circuit comprises a chip U1 and an operational amplifier U2B, wherein the output end of the chip U1 is connected with the positive phase input end of the operational amplifier U2B, and the negative phase input end of the operational amplifier U2B is connected with the power supply conversion circuit.
6. The frequency converter brake circuit of claim 5, wherein: the model number of the operational amplifier U2B is TL082A.
7. The frequency converter brake circuit of claim 5, wherein: the chip U1 is a voltage stabilizer, and the model of the chip U1 is TL431AIDBZR.
8. The frequency converter brake circuit of claim 5, wherein: the brake driving circuit comprises a driving optocoupler U3, a transient suppression diode TVS1, a resistor R22, a brake resistor Rbrk and a MOS tube MK1, wherein the driving optocoupler U3 is connected with the output end of an operational amplifier U2B, the output end of the driving optocoupler U3 is connected with the 2 pin of the MOS tube MK1, the resistor R22 is connected between the driving optocoupler U3 and the MOS tube MK1 after being connected in parallel with the transient suppression diode TVS1, and the brake resistor Rbrk is connected with the 3 pin of the MOS tube MK 1.
9. The frequency converter brake circuit of claim 8, wherein: the model of the MOS tube MK1 is LXA60IF1200NA.
10. The frequency converter brake circuit of claim 8, wherein: the driving optocoupler U3 is a photo coupler, and the model is TLP350.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321322686.7U CN219802153U (en) | 2023-05-29 | 2023-05-29 | Frequency converter brake circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321322686.7U CN219802153U (en) | 2023-05-29 | 2023-05-29 | Frequency converter brake circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219802153U true CN219802153U (en) | 2023-10-03 |
Family
ID=88157178
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321322686.7U Active CN219802153U (en) | 2023-05-29 | 2023-05-29 | Frequency converter brake circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219802153U (en) |
-
2023
- 2023-05-29 CN CN202321322686.7U patent/CN219802153U/en active Active
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