CN218603369U - Marine braking chopper circuit - Google Patents
Marine braking chopper circuit Download PDFInfo
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- CN218603369U CN218603369U CN202221791406.2U CN202221791406U CN218603369U CN 218603369 U CN218603369 U CN 218603369U CN 202221791406 U CN202221791406 U CN 202221791406U CN 218603369 U CN218603369 U CN 218603369U
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Abstract
The utility model relates to a marine braking chopper circuit, input wiring end connects positive pole DC + and negative pole DC-of converter output bus, and the output wiring end is connected to the both ends of outside braking resistance, and the DC + utmost point of input wiring end is directly connected in the one end of output wiring end, and the DC-utmost point of input wiring end is connected in the projecting pole of IGBT module, and the other end of output wiring end is connected in the collecting electrode of IGBT module; the absorption circuit is connected in parallel with two ends of an emitter and a collector of the IGBT module; the voltage detection circuit collects the bus voltage of the frequency converter and outputs a control signal to control the on/off of a switch connected with the brake chopper by the direct-current bus of the frequency converter. When the voltage of the direct-current bus of the frequency converter rises, and the voltage detection circuit recognizes that the input voltage exceeds the safety threshold, the brake chopper starts to work to consume redundant brake energy, and when the input voltage meets the safety threshold condition, the brake chopper stops working, so that the frequency conversion driving system and the unit are ensured to run safely and stably, the brake efficiency is ensured, and the brake cost is reduced.
Description
Technical Field
The utility model relates to a control technology, in particular to marine braking chopper circuit.
Background
For a unit with large load inertia, when the frequency converter is used for driving, and the motor works in a power generation state at the braking moment, the braking energy can cause the bus voltage of the frequency converter to rise, and if the voltage exceeds a safety threshold value, the equipment can be damaged, so that the consumption of the braking energy is very important. The brake chopper power unit system disclosed in chinese patent No. 20151057682.9 is too complex, is not favorable for realizing the small and light weight of equipment, and is not suitable for marine application occasions for a while; the integrated chopper disclosed in the Chinese patent No. 201410506583.5 has unobvious function distinction, relatively fixed braking capacity and is not beneficial to function expansion and extension. Both of the above-mentioned circuit structures fail to fully realize a good and flexible braking function, and are temporarily unsuitable for marine applications. Braking chopper circuit is suitable for but not limited to boats and ships application, can guarantee frequency conversion actuating system and unit safety and stability operation, guarantees braking efficiency simultaneously, reduces the braking cost.
Disclosure of Invention
The marine brake chopper circuit is provided for solving the problem of overvoltage risk caused by the fact that the bus voltage of a frequency converter rises due to brake energy in the braking moment of a unit which has larger load inertia and is driven by the frequency converter.
The technical scheme of the utility model is that: a marine braking chopper circuit comprises an IGBT module, an absorption circuit, a voltage detection circuit, a switch, an input terminal and a braking resistor terminal, wherein the input terminal is connected with a positive electrode DC + and a negative electrode DC-of an output bus of a frequency converter, the output terminal is connected to two ends of an external braking resistor, the DC + pole of the input terminal is directly connected to one end of the output terminal, the DC-pole of the input terminal is connected to an emitting electrode of the IGBT module, and the other end of the output terminal is connected to a collecting electrode of the IGBT module; the absorption circuit is connected in parallel with two ends of an emitter and a collector of the IGBT module; the voltage detection circuit acquires the voltage of the output bus of the frequency converter, and the voltage detection circuit outputs a control signal to control the on/off of a switch connected with the brake chopper and the direct-current bus of the frequency converter.
Preferably, the voltage level U of the IGBT module S The selection range is 2.0U 1 >U S >1.5U 1 ，U 1 Normal voltage of a bus of the frequency converter; the current level I of the IGBT module S Selecting the range as 3I>I S >1.5I, I is the sustained maximum brake current.
Preferably, the absorption circuit comprises an absorption resistor, an absorption capacitor and a diode; the absorption resistor is connected with the absorption capacitor in parallel, one end of the absorption resistor is used as a first input end of the absorption circuit, the other end of the absorption resistor is connected with the cathode of the diode, and the anode of the diode is used as a second input end of the absorption circuit; the first input terminal of the snubber circuit is connected to the collector of the IGBT module and the second input terminal is connected to the emitter of the IGBT module.
The beneficial effects of the utility model reside in that: the utility model discloses marine braking chopper circuit is suitable for but not limited to boats and ships application, can guarantee variable frequency drive system and unit safety and stability operation, guarantees braking efficiency simultaneously, reduces the braking cost.
Drawings
FIG. 1 is a schematic diagram of a marine brake chopper circuit of the present invention;
FIG. 2 is a schematic diagram of an absorption circuit in the marine braking chopper circuit of the present invention;
fig. 3 is the utility model discloses voltage detection circuit schematic diagram among marine braking chopper circuit.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments. The embodiment of the present invention is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
As shown in a schematic diagram of a marine braking chopper circuit shown in fig. 1, an input end of a braking chopper circuit is connected to a converter direct-current bus 100, when a load end 200 of the converter brakes, the voltage of the converter direct-current bus rises, when a voltage detection circuit of the braking chopper identifies that the input voltage exceeds a safety threshold, the braking chopper starts to work, redundant braking energy is consumed, and when the input voltage is identified to meet the safety threshold, the braking chopper stops working. The brake chopper circuit comprises an IGBT module 1, an absorption circuit 2, a voltage detection circuit 3, a switch 4, an input terminal Din and a brake resistor terminal Dout. The input terminal Din is used as an input terminal of the braking chopper circuit and is respectively connected with the positive pole DC + and the negative pole DC-, wherein the DC + is correspondingly connected to the positive pole of the frequency converter bus, and the DC-is correspondingly connected to the negative pole of the frequency converter bus. The output terminal Dout is used as the output terminal of the braking chopper circuit, and is respectively BR + and BR-, and is connected to the two ends of the external braking resistor. In the circuit, a DC + pole of an input terminal Din is directly connected to a BR + pole of an output terminal Dout, a DC-pole of the input terminal Din is connected to an emitter E of the IGBT module 1, and a BR-pole of an output terminal 5 is connected to a collector C of the IGBT module 1. The absorption circuit 2 is connected in parallel to the two ends C and E of the IGBT module 1, and is configured to absorb a high voltage spike generated during the turn-off process of the IGBT module 1. The voltage detection circuit 3 collects the voltage between DC + and DC-of the input terminal Din, realizes the detection of the input voltage, judges the working state of the brake chopper circuit, and outputs a control signal to control a switch 4 for connecting a direct-current bus of the frequency converter with the brake chopper by the voltage detection circuit 3.
Voltage class U of input terminal Din and output terminal Dout J Selecting and inputting normal working voltage U from outside 1 In connection with this, it is recommended to choose a minimum voltage level greater than this value, but not less than this value; current class I J The selection is related to the sustained maximum braking current I, preferably the minimum current level is selected to be greater than this value, but not less than this value. Voltage class of IGBT module 1U S With the external input of normal operating voltage U 1 Related, i.e. 2.0U 1 >U S >1.5U 1 Selecting an approximate voltage grade within a range by combining with the conventional voltage grade design condition of the IGBT; current class I of IGBT module 1 S Associated with a sustained maximum braking current I, i.e. 3I>I S >1.5I, and selecting approximate current levels in the range by combining with the conventional current level design condition of the IGBT. In the present embodiment, the normal operating voltage U is externally input 1 =700V, continuous maximum braking current I =150A. Then the voltage level U of the input terminal Din and the output terminal Dout J >700V, preferably 700V, current level I J >150A, preferably 200A; voltage class 1400V of IGBT module 1>U S >1050V, preferably 1200V, current level 450A>I S >225A, preferably 300A.
Fig. 2 is a schematic diagram of an absorption circuit. The absorption circuit 2 includes an absorption resistor 5, an absorption capacitor 6, and a diode 7. The absorption resistor 5 is connected in parallel with the absorption capacitor 6, one end of the absorption resistor is used as the input end 1 of the absorption circuit, the other end of the absorption resistor is connected with the cathode of the diode 7, and the anode of the diode 7 is used as the input end 2 of the absorption circuit. The absorption circuit has an input terminal 1 connected to the collector C of the IGBT module 1 and an input terminal 2 connected to the emitter E of the IGBT module 2.
Wherein, the capacitance value C of the absorption capacitor 6 and the loop stray inductance energy E L External input of normal operating voltage U 1 And expected overshoot voltage U 2 In connection with, i.e. with
Loop stray inductance energy E L And loop stray inductance L s And peak current I when IGBT module 1 is turned off p In connection with, i.e. with
Wherein, the loop stray inductance L s And the off-time peak current I of the IGBT module 1 p Can be obtained by testing, U 1 The bus voltage setting value of the frequency converter is a known quantity and can be obtained by inquiring a frequency converter manual or actual measurement; u shape 2 To design the expected value, the device is normally operated with the external inputAs voltage U 1 And voltage class U of IGBT module 1 S Related, theoretical U 2 The smaller the value the higher the system security, i.e. U 2 >0, but in practice it is more difficult to achieve, so control below a certain safety threshold is considered to meet the use requirement, i.e. U 2 <0.875U s -U 1 . The resistance value R of the absorption resistor 5, the capacitance value C of the absorption capacitor 6, the cut-off time t and the external input normal working voltage U 1 And desired overshoot voltage U 2 In connection with, i.e.
The cut-off time t can be selected according to the minimum turn-on time of the IGBT module. Absorbing the power E of the resistor 5 R Energy E of stray inductance of loop L Dependent on the switching frequency f of the IGBT module, i.e. 1.8E L ×f<E R <2.2E L Xf, preferably E R ＝2E L Xf. In the present embodiment, the normal operating voltage U is externally input 1 =700V, stray inductance L of the loop s =2 μ H, peak current I at turn-off of IGBT module 1 p =212A, cut-off time t =5ns, switching frequency f =1k, and overshoot voltage U is expected 2 Optional 0-350V, preferably 200V, loop stray inductance energy E L =45mJ, the capacitance C =0.218 μ F of the absorption capacitor 6, the resistance R =256 Ω of the absorption resistor 5, and the power 81 of the absorption resistor 5<E R <99W, preferably 90W.
Fig. 3 is a schematic diagram of the voltage detection circuit of fig. 1. The voltage detection circuit is used for detecting the value of the input voltage and further judging the working and stopping states of the marine brake chopper circuit. The voltage detection circuit comprises an operational amplifier 8, wherein the operational amplifier 8 selects a single power supply operational amplifier chip, 8 pins and 4 pins of the operational amplifier are power supply input pins and are respectively connected with VCC and GND, the equidirectional input end is 3, the reverse input end is 2, and the output end is 1. The sampling resistor 9 is connected between the input DC and the same-direction input end 3 of the operational amplifier 8, the sampling resistor 10 is connected between the input DC + and the reverse-direction input end 2 of the operational amplifier 8, the values of the sampling resistors 9 and 10 are the same, and the value is R 1 (ii) a The divider resistor 11 is connected between the equidirectional input end 3 of the operational amplifier 8 and the output end 1 of the operational amplifier 8. The divider resistor 12 is connected to the inverting input terminal 2 of the operational amplifier 8 and the power of the operational amplifier 8Between the source GND. The resistance values of the divider resistor 11 and the divider resistor 12 are the same, and are R 2 。
R 2 Maximum working current I of operational amplifier chip 8 y And level U y In connection with, R 2 >U y /I y Optionally R is selected 2 ＝2U y /I y 。R 1 Selection of the desired proportionality coefficient S, and externally input normal operating voltage U 1 The expected voltage acquisition signal is U o And the resistance R of the sampling resistors 11, 12 2 In connection with the circuit principle, the desired acquisition scaling factor S = R 1 /R 2 ＝2U 1 /U o I.e. R1=2 xr 2 × U 1 /U o . In this embodiment, the desired maximum output voltage U o Is 3V, and the external input normal working voltage U 1 =700V, and the expected voltage acquisition signal is U o Is 3V, and the maximum working current I of the operational amplifier chip 8 y =10mA, level U y =5V, therefore R 2 >500 Ω, preferably R 2 =1k Ω; the desired scaling factor S =466.6, R1=933.3k Ω.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, which all fall within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (3)
1. A marine brake chopper circuit is characterized by comprising an IGBT module, an absorption circuit, a voltage detection circuit, a switch, an input terminal and a brake resistor terminal, wherein the input terminal is connected with a positive electrode DC + and a negative electrode DC-of an output bus of a frequency converter, the output terminal is connected to two ends of an external brake resistor, the DC + pole of the input terminal is directly connected to one end of the output terminal, the DC-pole of the input terminal is connected to an emitter electrode of the IGBT module, and the other end of the output terminal is connected to a collector electrode of the IGBT module; the absorption circuit is connected in parallel with two ends of an emitter and a collector of the IGBT module; the voltage detection circuit acquires the voltage of the output bus of the frequency converter, and the voltage detection circuit outputs a control signal to control the on/off of a switch connected with the brake chopper and the direct-current bus of the frequency converter.
2. The marine brake chopper circuit of claim 1, wherein the voltage level U of the IGBT module S The selection range is 2.0U 1 >U S >1.5U 1 ，U 1 Normal voltage of a bus of the frequency converter; the current level I of the IGBT module S Selecting the range as 3I>I S >1.5I, I is the sustained maximum brake current.
3. The marine brake chopper circuit according to claim 1 or 2, wherein the absorption circuit includes an absorption resistor, an absorption capacitor, and a diode; the absorption resistor is connected with the absorption capacitor in parallel, one end of the absorption resistor is used as a first input end of the absorption circuit, the other end of the absorption resistor is connected with the cathode of the diode, and the anode of the diode is used as a second input end of the absorption circuit; the first input terminal of the snubber circuit is connected to the collector of the IGBT module and the second input terminal is connected to the emitter of the IGBT module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221791406.2U CN218603369U (en) | 2022-07-12 | 2022-07-12 | Marine braking chopper circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221791406.2U CN218603369U (en) | 2022-07-12 | 2022-07-12 | Marine braking chopper circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218603369U true CN218603369U (en) | 2023-03-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221791406.2U Active CN218603369U (en) | 2022-07-12 | 2022-07-12 | Marine braking chopper circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218603369U (en) |
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2022
- 2022-07-12 CN CN202221791406.2U patent/CN218603369U/en active Active
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