CN215498776U - Braking device and frequency converter braking system - Google Patents
Braking device and frequency converter braking system Download PDFInfo
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- CN215498776U CN215498776U CN202121108073.4U CN202121108073U CN215498776U CN 215498776 U CN215498776 U CN 215498776U CN 202121108073 U CN202121108073 U CN 202121108073U CN 215498776 U CN215498776 U CN 215498776U
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Abstract
The utility model relates to a brake device and a frequency converter brake system, wherein the brake device comprises a discharge resistor, an IGBT module, an electrolytic capacitor module and a current limiting module, one end of the discharge resistor and the anode of the IGBT module are connected with the anode of a direct current bus of a frequency converter, the IGBT module is formed by connecting an upper IGBT switching tube unit and a lower IGBT switching tube unit in series, the other end of the discharge resistor is connected with the anode of the lower IGBT switching tube unit, the cathode of the IGBT module is connected with the cathode of the direct current bus of the frequency converter, the anode and the cathode of the IGBT module are connected with the electrolytic capacitor module and the current limiting module in parallel, the electrolytic capacitor module is connected with the current limiting module in series, and the current limiting module comprises a diode and a current limiting resistor. The utility model limits the electrolytic capacitor module to discharge under the rated current by arranging the current limiting module, improves the problem that the electrolytic capacitor module is heated and exploded due to over-discharge, reduces the capacity and the volume of the electrolytic capacitor module and reduces the product volume and the cost.
Description
Technical Field
The utility model relates to the field of brake devices, in particular to a brake device and a frequency converter brake system.
Background
The frequency converter is a power control device which applies a frequency conversion technology and a microelectronic technology and controls an alternating current motor by changing the frequency of a working power supply of the motor, and generally comprises a rectifying unit and an inverting unit. When the frequency converter controls the alternating current motor to brake, the motor can be dragged by a load and sends out electric energy, so that the direct current bus voltage of the frequency converter is increased, at the moment, the electric energy sent out by the motor is consumed by the braking device, the direct current bus voltage is controlled within a safe range, and the safe and stable operation of the frequency converter is guaranteed.
The prior art circuit of the braking device is shown in fig. 2 and consists of two IGBT modules, a discharge resistor and an electrolytic capacitor. When the brake of the alternating current motor is controlled, the voltage of a direct current bus of the frequency converter rises, and the direct current bus is discharged through a brake device connected with DC (+), DC (-). If the working voltage of the braking device is adjustable, and if the working voltage is adjusted to 700V and the voltage of the direct-current bus is higher than 700V, the pulse width of the T2 tube IGBT is controlled to be switched on to work, the RL resistor discharges, and the T1 tube IGBT is controlled to be switched off all the time. When the braking device applied to a high-power occasion, such as a 500KW braking device, the RL resistance value is about 1.2 ohms, and the electrolytic capacitors C1 and C2 preferentially discharge to RL at the moment of controlling the pulse width conduction of the IGBT of the T2 tube to work, and then discharge to RL only after DC (+), DC (-) and RL. When the discharge resistance RL is smaller and the IGBT pulse width of the T2 tube is controlled to be conducted, the current instantaneously released to the RL by the electrolytic capacitors C1 and C2 is larger, and the capacitance capacity of the capacitors C1 and C2 is required to be larger, so that the large-current discharge requirement of the capacitors C1 and C2 on the RL can be met. The larger the capacitance of the C1 and C2 capacitors is, the larger the added cost is, and the larger the capacitance of the C1 and C2 capacitors is, the larger the impact of DC (+) and DC (-) on the power-on current is. The discharge current of the electrolytic capacitor is limited, generally about 50 amperes, and because the internal resistance of the electrolytic capacitor is large, the large-current discharge can generate heat seriously. When RL resistance is 1.2 ohm, the instantaneous discharge reaches 600A. Therefore, the electrolytic capacitor in the high-power braking device generates heat seriously when working, and even is overheated and exploded.
Therefore, a new technical solution is needed to improve the above technical problems.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model aims to provide a braking device and a frequency converter braking system, wherein the direct-current bus capacitor is limited to discharge through a circuit for limiting the discharge function of the direct-current bus capacitor, so that the capacity and the cost of the direct-current bus capacitor in the braking device are reduced, the heat productivity of the direct-current bus capacitor is reduced, the direct-current bus capacitor is prevented from being heated and exploded, and the stability and the safety of the braking device are ensured.
The above object of the present invention is achieved by the following technical solutions:
the utility model provides a braking device, includes discharge resistor 1, IGBT module 2, electric capacity module 3 and limiting current module 4, discharge resistor 1's one end with IGBT module 2's positive pole is connected in the anodal of converter direct current generating line, IGBT module 2 comprises IGBT upper switch tube unit 21 and IGBT lower switch tube unit 22 series connection, discharge resistor 1's the other end with IGBT lower switch tube unit 22 positive pole is connected, IGBT module 2 negative pole is connected in converter direct current generating line negative pole, IGBT module 2's positive and negative pole is parallelly connected and is equipped with electrolytic capacitor module 3 and limiting current module 4, electrolytic capacitor module 3 establishes ties limiting current module 4, limiting current module 4 includes diode 41 and current-limiting resistor 42. The current limiting module 4 is used for limiting the magnitude of current released to the discharging resistor 1 by the electrolytic capacitor module 3.
By adopting the technical scheme, the switching tube unit on the IGBT module 2 is controlled to be turned off, the pulse width of the switching tube unit under the IGBT module 2 is controlled to be switched on, and the regenerative electric energy generated during the braking of the frequency converter is discharged through the discharging resistor 1 and the switching tube unit under the IGBT module 2, so that the direct-current bus of the frequency converter is prevented from overvoltage protection, and the stable and safe operation of the frequency converter is ensured. Meanwhile, the current limiting module 4 has the function of limiting the current released by the electrolytic capacitor module 3 to the discharge resistor 1, so that the electrolytic capacitor module 3 is ensured to discharge to the discharge resistor 1 under the rated current, and the electrolytic capacitor module 3 is prevented from being heated and exploded due to overdischarge.
The utility model is further configured to: the anode of the diode 41 is connected with the anode of the direct current bus, the cathode of the diode 41 is connected with the anode of the electrolytic capacitor module 3, the current limiting resistor 42 is connected in parallel with the two ends of the diode 41, and the cathode of the electrolytic capacitor module 3 is connected with the cathode of the direct current bus.
By adopting the technical scheme, the electrolytic capacitor module 3 is charged by the anode of the direct-current bus of the frequency converter through the diode 41, and the electrolytic capacitor module 3 carries out filtering energy storage on the bus voltage, so that the stability of the direct-current bus voltage is ensured. When the pulse width of the lower switching tube unit 22 of the IGBT module 2 is controlled to be on, the electrolytic capacitor module 3 preferentially discharges the discharge resistor 1, the current limiting resistor 42 limits the magnitude of the current released by the electrolytic capacitor module 3 to the discharge resistor 1, and forces the dc bus of the frequency converter to discharge the discharge resistor 1, so that the electrolytic capacitor module 3 is ensured to discharge the discharge resistor 1 at the rated current, and the electrolytic capacitor module 3 is prevented from being heated and exploded due to overdischarge.
The utility model is further configured to: the current limiting resistor 42 is a resistor with adjustable resistance.
By adopting the technical scheme, the resistance value of the current-limiting resistor with the adjustable resistance value can be adjusted according to electrolytic capacitor modules of different specifications, so that the electrolytic capacitor module 3 is ensured to discharge to the discharge resistor 1 under the rated current, and the electrolytic capacitor module 3 is prevented from being heated and exploded due to overdischarge.
The utility model is further configured to: the positive pole of the electrolytic capacitor module 3 is connected to the positive pole of the IGBT upper switch tube unit 21, the negative pole of the electrolytic capacitor module 3 is connected with the positive pole of the diode 41 in series, the current limiting resistor 42 is connected with the two ends of the diode 41 in parallel, the negative pole of the diode 41 is connected with the negative pole of the IGBT module 2 lower switch tube unit 22, and the resistance value of the current limiting resistor 42 is selected according to the rated discharge current of the electrolytic capacitor module 3.
By adopting the technical scheme, the cathode of the direct current bus of the frequency converter charges the electrolytic capacitor module 3 through the diode 41, and the electrolytic capacitor module 3 carries out filtering energy storage on the direct current bus voltage, so that the stability of the direct current bus voltage is ensured. When the pulse width of the switching tube unit 22 under the IGBT module 2 is controlled to be on, the electrolytic capacitor module 3 preferentially discharges the discharge resistor 1, the current limiting module 4 limits the magnitude of the current released by the electrolytic capacitor module 3 to the discharge resistor 1, and forces the dc bus of the frequency converter to discharge the discharge resistor 1, so that the electrolytic capacitor module 3 is ensured to discharge the discharge resistor 1 under the rated current, and the electrolytic capacitor module 3 is prevented from being heated and exploded due to overdischarge.
The utility model is further configured to: the current limiting resistor 42 is a resistor with adjustable resistance. One end of the current limiting resistor 42 is connected with the cathode of the electrolytic capacitor module 3, and the other end of the current limiting resistor 42 is connected with the cathode of the direct current bus.
By adopting the technical scheme, the resistance value of the current limiting resistor 42 with the adjustable resistance value can be adjusted according to the electrolytic capacitor modules 3 with different specifications, so that the electrolytic capacitor modules 3 are ensured to release current to the discharge resistor 1 under the rated current, and the electrolytic capacitor modules 3 are prevented from being heated and exploded due to over-discharge.
The utility model is further configured to: a frequency converter braking system adopts the braking device.
Through adopting above-mentioned technical scheme, compare with prior art, a arresting gear and converter braking system can reduce electrolytic capacitor module 3's capacity and volume, reduces product volume and cost, avoids electrolytic capacitor module 3 to explode because of the overdischarge leads to generating heat simultaneously.
In summary, the utility model includes at least one of the following beneficial technical effects:
1. the braking device and the frequency converter braking system ensure that the electrolytic capacitor module discharges to the discharge resistor under the rated current, and avoid the heating and explosion of the electrolytic capacitor module caused by overdischarge;
2. the circuit for limiting the discharge of the direct current bus electrolytic capacitor module is formed by connecting the diode and the current-limiting resistor in parallel, so that the requirements on the capacity and the volume of the electrolytic capacitor module can be reduced, the cost of the electrolytic capacitor module can be reduced, and the product volume can be reduced.
Drawings
Fig. 1 is a schematic diagram of the line connection of the present invention.
Fig. 2 is a circuit diagram of the prior art.
FIG. 3 is a schematic circuit diagram according to a first embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of a second embodiment of the present invention;
FIG. 5 is a schematic circuit diagram of a third embodiment of the present invention;
fig. 6 is another schematic circuit diagram according to a fourth embodiment of the present invention.
In the figure, 1, discharge resistance; 2. an IGBT module; 21. an IGBT upper switch tube unit; 22. a switching tube unit under the IGBT; 3. an electrolytic capacitor module; 4. a current limiting module; 41. a diode; 42. a current limiting resistor.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The first embodiment is as follows:
referring to fig. 1 and 3, the braking device disclosed by the utility model is applied to a circuit with a frequency converter and a three-phase power grid, and in the embodiment, the braking device is applied to braking of the frequency converter, so that electric energy generated by the frequency converter in a braking process is consumed through the braking device, and the problem of stable, rapid and safe braking of the frequency converter is solved. The input two ends of the braking device are respectively connected with the anode and the cathode of a direct-current bus of the frequency converter, and the discharge resistor 1 is used as a power consumption part and respectively connected with the anode of the direct-current bus of the frequency converter and the anode of the IGBT lower switching tube unit 22; when the motor connected with the frequency converter is decelerated and the rotating speed of the motor is greater than the output synchronous rotating speed of the frequency converter, the motor is in a power generation state, the frequency converter feeds electric energy back to a direct-current bus of the frequency converter at the moment, so that the voltage on the direct-current bus is increased, the braking device receives the voltage on the direct-current bus of the frequency converter and converts the received electric energy into heat energy to be consumed on the discharge resistor 1, and the function of stable, rapid and safe braking of the frequency converter is realized.
Referring to fig. 3, the braking device comprises one end of a discharge resistor 1 connected to the positive electrode of a direct-current bus of a frequency converter and the positive electrode of an IGBT module 2, wherein the positive electrode and the negative electrode of the IGBT module 2 are provided with an electrolytic capacitor module 3 and a current limiting module 4 in parallel, and the electrolytic capacitor module 3 is connected with the current limiting module 4 in series. The IGBT module 2 is formed by connecting an IGBT upper switch tube unit 21 and an IGBT lower switch tube unit 22 in series, the other end of the discharge resistor 1 is connected with the anode of the IGBT lower switch tube unit 22, the cathode of the IGBT lower switch tube unit 22 is connected with the cathode of a direct-current bus of the frequency converter, when the frequency converter brakes and generates electricity, the voltage of the direct-current bus is increased and is higher than a certain threshold value, if 700V, the IGBT upper switch tube unit 21 is controlled to be turned off, the IGBT lower switch tube unit 22 is controlled to be in pulse width conduction work, electricity generated by the frequency converter brake can be consumed on the discharge resistor 1, and the function of stable and rapid safe braking of the frequency converter is realized.
The current limiting module 4 is composed of a diode 41 and a current limiting resistor 42 which are connected in parallel, wherein the anode of the diode 41 is connected with the anode of the direct current bus, the cathode of the diode 41 is connected with the anode of the C1 in the electrolytic capacitor module 3, the current limiting resistor 42 is connected in parallel with two ends of the diode 41, and the cathode of the C2 in the electrolytic capacitor module 3 is connected with the cathode of the direct current bus. At the instant when the pulse width of the switching tube unit 22 under the IGBT is turned on, the electrolytic capacitor module 3 preferentially discharges the discharge resistor 1, the current limiting resistor 42 limits the magnitude of the current released by the electrolytic capacitor module 3 to the discharge resistor 1 at the positive electrode of the dc bus, and forces the dc bus of the frequency converter to discharge the discharge resistor 1, so that the electrolytic capacitor module 3 is ensured to discharge the discharge resistor 1 at the rated current, and the electrolytic capacitor module 3 is prevented from being heated and exploded due to overdischarge. Therefore, the capacity and the volume of the electrolytic capacitor module 3 can be reduced, and the aim of reducing the cost is fulfilled. When the lower switch tube unit 22 of the IGBT is turned off, the positive electrode of the dc bus charges the electrolytic capacitor module 3 through the diode 41, thereby achieving the filtering and voltage stabilizing effects.
Example two:
referring to fig. 4, a braking device is different from the first embodiment in that: the current limiting resistor 42 is a resistor whose resistance value is adjustable. The current limiting resistor 42 capable of adjusting the resistance value can adjust the resistance value according to electrolytic capacitor modules 3 of different specifications, so that the electrolytic capacitor module 3 can still discharge to the discharge resistor 1 at rated current when the electrolytic capacitor module 3 is at the maximum value of the direct current bus voltage, such as 800 v. The electrolytic capacitor module 3 is prevented from being heated and exploded due to overdischarge when the voltage of the direct current bus is maximum.
Example three:
referring to fig. 5, the braking device comprises one end of a discharge resistor 1 connected to the positive electrode of a direct-current bus of a frequency converter and the positive electrode of an IGBT module 2, wherein the positive electrode and the negative electrode of the IGBT module 2 are provided with an electrolytic capacitor module 3 and a current limiting module 4 in parallel, and the electrolytic capacitor module 3 is connected with the current limiting module 4 in series. The IGBT module 2 is formed by connecting an IGBT upper switch tube unit 21 and an IGBT lower switch tube unit 22 in series, the other end of the discharge resistor 1 is connected with the anode of the IGBT lower switch tube unit 22, the cathode of the IGBT lower switch tube unit 22 is connected with the cathode of a direct-current bus of the frequency converter, when the frequency converter brakes and generates electricity, the voltage of the direct-current bus is increased and is higher than a certain threshold value, if 700V, the IGBT upper switch tube unit 21 is controlled to be turned off, the IGBT lower switch tube unit 22 is controlled to be in pulse width conduction work, electricity generated by the frequency converter brake can be consumed on the discharge resistor 1, and the function of stable and rapid safe braking of the frequency converter is realized.
Referring to fig. 5, the electrolytic capacitor module 3 is composed of two sets of electrolytic capacitors C1 and C2 connected in series. The current limiting module 4 comprises a diode 41 and a current limiting resistor 42. The cathode of the diode 41 is connected with the cathode of the direct current bus, the anode of the diode 41 is connected with the cathode of the C2 electrolytic capacitor, the current limiting resistor 42 is connected in parallel with two ends of the diode 41, and the anode of the C1 electrolytic capacitor is connected with the anode of the direct current bus. At the instant when the pulse width of the switching tube unit 22 under the IGBT is turned on, the electrolytic capacitor module 3 preferentially discharges the discharge resistor 1, the current limiting resistor 42 limits the magnitude of the current released by the electrolytic capacitor module 3 to the discharge resistor 1 at the negative electrode of the dc bus, and forces the dc bus of the frequency converter to discharge the discharge resistor 1, so that the electrolytic capacitor module 3 is ensured to discharge the discharge resistor 1 at the rated current, and the electrolytic capacitor module 3 is prevented from being heated and exploded due to overdischarge. Therefore, the capacity and the volume of the electrolytic capacitor module 3 can be reduced, and the aim of reducing the cost is fulfilled. When the IGBT lower switching tube unit 22 is turned off, the cathode of the direct current bus charges the electrolytic capacitor module 3 through the diode 41, and the filtering and voltage stabilizing effects are achieved.
Example four:
referring to fig. 6, a brake apparatus is different from the third embodiment in that: the current limiting resistor 42 is a resistor whose resistance value is adjustable. The current limiting resistor 42 capable of adjusting the resistance value can adjust the resistance value according to electrolytic capacitor modules 3 of different specifications, so that the electrolytic capacitor module 3 can still discharge to the discharge resistor 1 at rated current when the electrolytic capacitor module 3 is at the maximum value of the direct current bus voltage, such as 800 v. The electrolytic capacitor module 3 is prevented from being heated and exploded due to overdischarge when the voltage of the direct current bus is maximum.
Example five:
referring to fig. 1, the design also discloses a frequency converter braking system, and by adopting the braking device, the size of the current released by the direct current bus electrolytic capacitor module 3 can be limited, the capacity and the volume of the electrolytic capacitor module 3 can be reduced, the product volume and the cost can be reduced, and meanwhile, the electrolytic capacitor module 3 is prevented from being heated and exploded due to overdischarge.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered by the protection scope of the utility model.
Claims (6)
1. The utility model provides a brake equipment, brake equipment has restriction direct current busbar electric capacity discharge function, including discharge resistor (1), IGBT module (2), electrolytic capacitor module (3) and limiting current module (4), the one end of discharge resistor (1) with the anodal of IGBT module (2) is connected in the anodal of converter direct current busbar, IGBT module (2) is established ties by last switch tube unit (21) of IGBT and IGBT lower switch tube unit (22) and is constituteed, the other end of discharge resistor (1) with IGBT lower switch tube unit (22) anodal is connected, IGBT module (2) negative pole is connected in converter direct current busbar negative pole, the positive negative pole of IGBT module (2) is parallelly connected and is equipped with electrolytic capacitor module (3) and limiting current module (4), its characterized in that: the electrolytic capacitor module (3) is connected in series with the current limiting module (4), and the current limiting module (4) comprises a diode (41) and a current limiting resistor (42).
2. The braking apparatus according to claim 1, characterized in that: the positive electrode of the diode (41) is connected with the positive electrode of the direct current bus, the negative electrode of the diode (41) is connected with the positive electrode of the electrolytic capacitor module (3), the current limiting resistor (42) is connected to the two ends of the diode (41) in parallel, and the negative electrode of the electrolytic capacitor module (3) is connected with the negative electrode of the direct current bus.
3. The braking apparatus according to claim 2, characterized in that: the current limiting resistor (42) is a resistor with adjustable resistance value.
4. The braking apparatus according to claim 1, characterized in that: the positive electrode of the diode (41) is connected with the negative electrode of the electrolytic capacitor module (3), the negative electrode of the diode (41) is connected with the negative electrode of the direct current bus, the current limiting resistor (42) is connected to the two ends of the diode (41) in parallel, and the positive electrode of the electrolytic capacitor module (3) is connected with the positive electrode of the direct current bus.
5. The braking apparatus according to claim 4, characterized in that: the current limiting resistor (42) is a resistor with adjustable resistance value.
6. A transducer brake system, characterised in that a braking device according to any one of claims 1-5 is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121108073.4U CN215498776U (en) | 2021-05-20 | 2021-05-20 | Braking device and frequency converter braking system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121108073.4U CN215498776U (en) | 2021-05-20 | 2021-05-20 | Braking device and frequency converter braking system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215498776U true CN215498776U (en) | 2022-01-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121108073.4U Active CN215498776U (en) | 2021-05-20 | 2021-05-20 | Braking device and frequency converter braking system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215498776U (en) |
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2021
- 2021-05-20 CN CN202121108073.4U patent/CN215498776U/en active Active
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