CN203827170U - Circuit device possessing frequency transformer soft startup circuit and energy consumption braking circuit - Google Patents
Circuit device possessing frequency transformer soft startup circuit and energy consumption braking circuit Download PDFInfo
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- CN203827170U CN203827170U CN201420237537.5U CN201420237537U CN203827170U CN 203827170 U CN203827170 U CN 203827170U CN 201420237537 U CN201420237537 U CN 201420237537U CN 203827170 U CN203827170 U CN 203827170U
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- brake
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Abstract
The utility model provides a circuit device possessing a frequency transformer soft startup circuit and an energy consumption brake circuit, comprising a relay, a power resistor, a diode, an electrolytic capacitor, and a brake pipe. The circuit device is electrically connected to an DC bus, which not only restricts the shock current which is happened when the original power-on start-up of the frequency transformer is performed in order to prevent the damages of a previous stage of a rectification unit and a later stage of a flat wave capacitor caused by big current and to limit the voltage of the DC bus within a reasonable range. The circuit device possessing the frequency transformer soft startup circuit and the energy consumption brake circuit has advantages of less members, small volume, low cost, etc.
Description
Technical field
The utility model relates to electric field, refer to especially a kind of frequency converter soft starting circuit and energy-dissipating brake circuit, based on this circuit, not only can limit the impulse current of frequency converter in the time of initial electrifying startup, DC bus-bar voltage can also be limited in a rational scope.
Background technology
Frequency converter is in the time initially powering on, due to the existence of rear class flat wave capacitor, if do not do soft start processing, have very large charging current at powered on moment, its electric current is big far beyond the electric current ability to bear of prime rectification unit, and excessive charging current also can be on having produced very large impact the useful life of rear class flat wave capacitor.Therefore, need to be to adding soft starting circuit between the rectification unit of frequency converter and flat wave capacitor, common way is, adds a relay between rectification unit and flat wave capacitor, a soft start resistance in parallel between the normally opened contact of relay and normally-closed contact.In the time of frequency converter electrifying startup, will be divided into two stages, at first stage, DC bus-bar voltage is zero, the normally opened contact of relay and normally-closed contact are not closed, rectification unit charges to flat wave capacitor by soft start resistance, DC bus-bar voltage raises gradually, and in the time that flat wave capacitor voltage rises to setting threshold values, the charging of first stage finishes; In second stage, DC bus-bar voltage rises to the threshold values of setting, relay normally open contact and normally-closed contact closure, soft start resistance is by short circuit, rectification unit charges to flat wave capacitor by relay closes contact, until DC bus-bar voltage reaches the maximum that rectification unit can be exported, second stage finishes, and frequency converter soft start finishes.In the first stage, although rectification unit output voltage and DC bus-bar voltage have very large voltage difference, but due to the existence of soft start resistance, limit charging current excessive, in second stage, rectification unit output voltage and DC bus-bar voltage pressure reduction are less, though lacked resistance current limliting, charging current can be very not large yet, the generation of large impulse current while so just having avoided frequency converter initially to power on.
In frequency converter, also exist energy-dissipating brake circuit, it comprises brake pipe, brake resistance, diode, for DC bus-bar voltage is limited in the scope of a setting, its operation principle is, the energy feedback causing due to decelerating through motor or other reasons cause that DC bus-bar voltage is too high and exceed while setting threshold values, brake pipe is open-minded, DC bus is by the brake conductive discharge being serially connected with brake pipe, DC bus-bar voltage reduces, when low when certain threshold values, brake pipe is closed, DC bus-bar voltage continues to rise, in the time that DC bus-bar voltage is too high and exceed setting threshold values, brake pipe is once more open-minded, so move in circles, ensure that DC bus-bar voltage is stabilized in a smaller scope.
Above-mentioned way also has certain limitation, and to achieve these goals, system need to be equipped with respectively soft start resistance and brake resistance, and these two resistance are all power resistors, and not only volume is large, and cost is also high.And above-mentioned soft start resistance just works at powered on moment, all the other times, so be just in idle state always, the utilance of element was very low, therefore very uneconomical because relay bungalow closure is closed.
Utility model content
The utility model is intended to address the above problem, and has proposed a kind of circuit arrangement with frequency converter soft starting circuit and energy-dissipating brake circuit, and it can ensure soft start effect and the dynamic braking effect of frequency converter, has avoided again the low problem of element utilance.
To achieve these goals, the technical scheme that the utility model provides is:
A kind of circuit arrangement with frequency converter soft starting circuit and energy-dissipating brake circuit, comprise relay, power resistor, diode, electrochemical capacitor, brake pipe, it is characterized in that: described relay is connected in series on DC bus, the normally-closed contact of described power resistor and relay is electrically connected, and one end of described diode and the normally opened contact of relay are electrically connected; The other end of brake resistance and diode and brake pipe are electrically connected, and electrochemical capacitor is connected in parallel on DC bus as flat wave capacitor.
Preferably, in the frequency converter electrifying startup first stage, relay is not closed, rectification unit charges to the flat wave capacitor on DC bus by power resistor, diode, DC bus-bar voltage rises, and in the time that DC bus-bar voltage reaches the threshold values of setting, the first stage finishes; In second stage, relay closes, the flat wave capacitor charge circuit of brake resistance and diode composition is by short circuit, and rectification unit charges to flat wave capacitor by relay closes contact.
Preferably, described power resistor can be used as soft start resistance in the time of frequency converter electrifying startup, after frequency converter soft start finishes, can be used as again brake resistance.
Implementation procedure of the present utility model is as follows: in the first stage of frequency converter electrifying startup, relay is not closed, rectification unit charges to the flat wave capacitor on DC bus by power resistor, diode, DC bus-bar voltage rises, in the time that DC bus-bar voltage reaches the threshold values of setting, the first stage finishes; In second stage, relay closes, the flat wave capacitor charge circuit of brake resistance and diode composition is by short circuit, and rectification unit charges to flat wave capacitor by relay closes contact, until DC bus-bar voltage reaches the maximum voltage that rectification unit can be exported.In whole charging process, first stage is because power resistor is serially connected in charge circuit, therefore there will not be large impulse current, second stage due to rectification unit output voltage and DC bus-bar voltage pressure reduction less, large charging current also there will not be, thereby has realized the soft start function of frequency converter.
Further, at relay during in closure state, the energy feedback causing due to decelerating through motor or other reasons cause that DC bus-bar voltage is too high and exceed while setting threshold values, control brake pipe conducting, flat wave capacitor is by relay closes contact, the electric discharge of brake resistance loop, and flat wave capacitor both end voltage declines, in the time dropping to specified threshold, brake pipe is closed, and and so forth, has ensured that DC bus-bar voltage is stabilized in a specified scope.
Further, described brake pipe is any in metal-oxide-semiconductor, IGBT pipe.
Further, in order to ensure the soft start effect of circuit arrangement, the resistance of power resistor is unsuitable too small; Again in order to take into account skidding effect, the resistance of power resistor is unsuitable excessive again simultaneously, and therefore the resistance value scope of power resistor is 10 ohm～100 ohm.
Further, a kind of circuit arrangement with frequency converter soft starting circuit and energy-dissipating brake circuit, wherein, the minimum forward current of described diode is 3 amperes.
Useful achievement of the present utility model is: the multiplexing power resistor of soft starting circuit and braking circuit, reduce number of elements, and reduce volume and reduced cost.
brief description of the drawings
Fig. 1 is the conventional soft starting circuit of frequency converter and energy-dissipating brake circuit.
The circuit arrangement structural representation that Fig. 2 provides for the utility model.
Embodiment
For making the technical problems to be solved in the utility model, technical scheme and advantage clearer, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
embodiment 1
As shown in Figure 2, relay is serially connected on DC bus, power resistor R1 and diode
succeed respectively normally-closed contact and the normally opened contact of electrical equipment, described power resistor R1 and diode
another termination brake pipe, electrochemical capacitor
be attempted by DC bus as flat wave capacitor.
Specific implementation principle is as follows: in the frequency converter electrifying startup first stage, relay is not closed, and prime rectification unit is by this power resistor R1, diode
give flat wave capacitor
charging, charging current is:
, wherein
for the output voltage of prime rectification unit,
for the forward voltage drop tube of diode,
for the resistance of power resistor R1; Work as flat wave capacitor
voltage reach certain value
time, relay closes, the first stage finishes; In second stage, power resistor R1 and diode
composition flat wave capacitor charge circuit fallen by relay closes contact short, rectification unit by relay contact to flat wave capacitor
charging, until the voltage of flat wave capacitor reaches the maximum voltage value that rectification unit can be exported, second stage finishes.In whole charging process, first stage is because power resistor is serially connected in charge circuit as soft start resistance, therefore there will not be large impulse current, second stage due to rectification unit output voltage and DC bus-bar voltage pressure reduction less, large charging current also there will not be, thereby has realized the soft start function of frequency converter.
embodiment 2
As shown in Figure 2, at relay during in closure state, the energy feedback causing due to decelerating through motor or other reasons cause that DC bus-bar voltage is too high and exceed while setting high threshold values brake pipe
conducting, flat wave capacitor
the loop electric discharge forming by relay closes contact, power resistor R1, DC bus-bar voltage declines, and in the time dropping to appointment low valve valve, brake pipe is closed, and now DC bus-bar voltage will will raise again, in the time exceeding the high threshold values of setting, brake pipe
conducting once more, and so forth, has ensured that DC bus-bar voltage is stabilized in a specified scope.In this process, power resistor R1 act as brake resistance.
Further, described diode
effect in this process is: for the stray inductance on power resistor R1 provides energy Releasing loop, in case at brake pipe
while closing, the due to voltage spikes that the stray inductance on power resistor R1 causes damages brake pipe.
The above is preferred implementation of the present utility model; should be understood that; for those skilled in the art; do not departing under the prerequisite of principle described in the utility model; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (6)
1. there is a circuit arrangement for frequency converter soft starting circuit and energy-dissipating brake circuit, comprise relay, power resistor, diode, electrochemical capacitor, brake pipe, it is characterized in that:
Described relay is connected in series on DC bus, and the normally-closed contact of described power resistor and relay is electrically connected, and one end of described diode and the normally opened contact of relay are electrically connected;
The other end of brake resistance and diode and brake pipe are electrically connected, and electrochemical capacitor is connected in parallel on DC bus as flat wave capacitor.
2. circuit arrangement as claimed in claim 1, is characterized in that:
In the frequency converter electrifying startup first stage, relay is not closed, and rectification unit is by power resistor, diode to the flat wave capacitor charging on DC bus, and DC bus-bar voltage rises, and in the time that DC bus-bar voltage reaches the threshold values of setting, the first stage finishes;
In second stage, relay closes, the flat wave capacitor charge circuit of brake resistance and diode composition is by short circuit, and rectification unit charges to flat wave capacitor by relay closes contact.
3. circuit arrangement as claimed in claim 1, is characterized in that:
Described power resistor can be used as soft start resistance in the time of frequency converter electrifying startup, after frequency converter soft start finishes, can be used as again brake resistance.
4. circuit arrangement as claimed in claim 1, wherein, described brake pipe is any in metal-oxide-semiconductor, IGBT pipe.
5. circuit arrangement as claimed in claim 1, wherein, the Standard resistance range of described power resistor is 10 ohm～10O ohm.
6. circuit arrangement as claimed in claim 1, wherein, described diode, its minimum forward current is 3 amperes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420237537.5U CN203827170U (en) | 2014-05-12 | 2014-05-12 | Circuit device possessing frequency transformer soft startup circuit and energy consumption braking circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420237537.5U CN203827170U (en) | 2014-05-12 | 2014-05-12 | Circuit device possessing frequency transformer soft startup circuit and energy consumption braking circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203827170U true CN203827170U (en) | 2014-09-10 |
Family
ID=51482631
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420237537.5U Expired - Fee Related CN203827170U (en) | 2014-05-12 | 2014-05-12 | Circuit device possessing frequency transformer soft startup circuit and energy consumption braking circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203827170U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103973091A (en) * | 2014-05-12 | 2014-08-06 | 江苏新瑞峰信息科技有限公司 | Circuit device with frequency converter soft start circuit and energy consumption brake circuit |
| CN104617635A (en) * | 2015-02-27 | 2015-05-13 | 北京精密机电控制设备研究所 | High-reliability high-power electromechanical servo power supply |
| CN105471249A (en) * | 2015-12-23 | 2016-04-06 | 广州三晶电气股份有限公司 | Frequency converter dynamic braking and power-on buffering circuit |
| CN106803732A (en) * | 2017-04-05 | 2017-06-06 | 绵阳市扬帆电子科技有限公司 | Energy transfer controller and application method |
| CN110071622A (en) * | 2018-01-23 | 2019-07-30 | 西门子公司 | The multi-functional pre-charge circuit and its control device and method and frequency converter of frequency converter |
-
2014
- 2014-05-12 CN CN201420237537.5U patent/CN203827170U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103973091A (en) * | 2014-05-12 | 2014-08-06 | 江苏新瑞峰信息科技有限公司 | Circuit device with frequency converter soft start circuit and energy consumption brake circuit |
| CN104617635A (en) * | 2015-02-27 | 2015-05-13 | 北京精密机电控制设备研究所 | High-reliability high-power electromechanical servo power supply |
| CN105471249A (en) * | 2015-12-23 | 2016-04-06 | 广州三晶电气股份有限公司 | Frequency converter dynamic braking and power-on buffering circuit |
| CN106803732A (en) * | 2017-04-05 | 2017-06-06 | 绵阳市扬帆电子科技有限公司 | Energy transfer controller and application method |
| CN110071622A (en) * | 2018-01-23 | 2019-07-30 | 西门子公司 | The multi-functional pre-charge circuit and its control device and method and frequency converter of frequency converter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140910 Termination date: 20190512 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |