CN202616989U - Device for providing pre-charging function and low-voltage debugging power supply function for cascaded high-voltage inverter - Google Patents
Device for providing pre-charging function and low-voltage debugging power supply function for cascaded high-voltage inverter Download PDFInfo
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- CN202616989U CN202616989U CN 201220215666 CN201220215666U CN202616989U CN 202616989 U CN202616989 U CN 202616989U CN 201220215666 CN201220215666 CN 201220215666 CN 201220215666 U CN201220215666 U CN 201220215666U CN 202616989 U CN202616989 U CN 202616989U
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Abstract
The utility model discloses a device for providing pre-charging function and low-voltage debugging power supply function for a cascaded high-voltage inverter. A three-phase input end of an auxiliary winding in the high-voltage inverter is connected with a three-phase low voltage power supply through three current-limiting resistors, and a main contactor group is connected between the current-limiting resistors and the three-phase low voltage power supply in series; a secondary side of a phase-shifting transformer is connected with a power unit of the cascaded high-voltage inverter, and the power unit is externally connected with a DC bus capacitor; a control part is a master control box of the cascaded high-voltage inverter, the master control box is provided with an input signal button, the signal output by the master control box controls the on and off of the main contactor group, and the power unit and the master control box are in signal communication connection. The device provided by the utility model is connected with a high-power corrugated resistor at the input end in series, so that the negative influence of the impulse current on devices is reduced, and the pre-charging process is perfected; moreover, the device provided by the utility model finishes the low-voltage debugging process of the cascaded high-voltage inverter without high-voltage power supply, and has the advantages of being low in cost and working reliably.
Description
Technical field
The utility model relates to the high voltage converter field, relates in particular to a kind of device that precharge and low pressure debugging power supply can be provided for cascaded high-voltage frequency converter.
Background technology
The high-power high voltage frequency converter at energy-conservation of consumption reduction, improve aspects such as technology and play an important role, high voltage converter is applied in the drive system of high-power machinery equipment such as blower fan, water pump, compressor increasingly extensively.Cascaded high-voltage frequency converter is powering on the initial stage at every turn, needs to give the electric capacity charging of One's name is legion, and the charging current of moment is very big, and this can be to the equal deleterious impact of frequency converter inside rectifier cell and user's electricity consumption.
Realize that at present reducing the powered on moment impact method of current has following several kinds: general general cascaded high-voltage frequency converter power cell three-phase alternating current inlet wire, use three phase full bridge rectifier bridge totally six diodes.With the last half-bridge of three-phase or down the diode of half-bridge be replaced with half control type device electric power thyristor, adjust the thyristor driver waveform and limit that voltage directly is added in the excessive impulse current that causes on the electric capacity in the charging process with crossing when powering on.But the drawback of the method is, needs usage quantity numerous half control type device and drive circuit, not only increased cost, technologic difficulty has also increased the risk that influences frequency converter stable operation.Also have directly mode at the straight cross-over connection bypass of power cell DC side power resistor, pre-charge process finish the closure of back through contactor with the power resistor short circuit to reach the purpose that does not influence normal working voltage.But the method still exists each unit all to need the drawback of installation power resistance and contactor control circuit, has not only increased cost and has also increased technologic complexity.Simultaneously can also realize that high voltage converter can be under the situation without high voltage supply, the purpose of low pressure energising debugging.
The utility model content
The utility model purpose is exactly in order to remedy the defective of prior art, a kind of device of realizing precharge and low pressure debugging power supply through the unit external cabling to be provided.
The utility model is realized through following technical scheme:
A kind of device that precharge and low pressure debugging power supply are provided for cascaded high-voltage frequency converter; Phase shifting transformer primary side in the described cascaded high-voltage frequency converter is provided with auxiliary winding; This device comprises circuit part and control section; Described circuit part is: the three-phase input end of described auxiliary winding links to each other with the three-phase low-tension supply through three current-limiting resistances; Between current-limiting resistance and three-phase low-tension supply, be in series with the main contactor group, the secondary side of described phase shifting transformer links to each other with the power cell of cascaded high-voltage frequency converter; Described control section is the Main Control Tank of cascaded high-voltage frequency converter, and Main Control Tank is provided with the input signal button, and the break-make of the said main contactor group of signal controlling of Main Control Tank output is carried out signal communication between said power cell and the Main Control Tank and is connected.
The characteristic of the utility model also is: if precharge moment impact electric current is excessive, can be parallel with contactor group and the current-limiting resistance that is in series at the main contactor group and the current-limiting resistance two ends of each input of assisting winding; Described current-limiting resistance is high-power ripple resistance; The voltage of described three-phase low-tension supply is 380V.
The operation principle of the utility model is: setting frequency converter through the man-machine interface of cascaded high-voltage frequency converter needs precharge action or low pressure debugging action, when being set at the precharge action, presses the input signal button; There is pulse signal to send into the Main Control Tank control chip through Main Control Tank IO mouth; Main Control Tank judges through the peripheral interface relay of cascaded high-voltage frequency converter whether cascaded high-voltage frequency converter is in no high pressure conditions, if Main Control Tank sends signal makes described main contactor group closed; Described dc-link capacitance is in pre-charge state; When dc-link capacitance voltage reach operating voltage 70% the time, power cell sends charging completion signal and gets in the Main Control Tank, Main Control Tank judges that precharge accomplishes; Main Control Tank just sends and breaks off main contactor group and the signal that allows to go up high pressure, and pre-charge process is accomplished; When being set at low pressure debugging action; Press the input signal button; Have pulse signal to send into the Main Control Tank control chip through main control box IO mouth, Main Control Tank judges through the peripheral interface relay of cascaded high-voltage frequency converter whether high voltage converter is in no high pressure conditions, if; Main Control Tank sends signal makes described main contactor group closed; Power cell does not send charging completion signal, and Main Control Tank does not send yet closes main contact group and allow to go up high-voltage signal, make the pcb board of power cell be in always electricity condition for accomplishing the low pressure debug process.
The utility model has the advantages that: the utility model is at the input high-power ripple resistance of having connected; Reduced the adverse effect of impulse current to device; Perfect pre-charge process; In addition, also realized having that cost is low, the advantage of reliable operation in the low pressure debug process that does not have under the situation of high voltage supply to accomplish cascaded high-voltage frequency converter.
Description of drawings
Fig. 1 is the circuit part sketch map of the utility model.
Fig. 2 is the control section sketch map of the utility model.
Embodiment
A kind of device that precharge and low pressure debugging power supply are provided for cascaded high-voltage frequency converter; Phase shifting transformer T primary side in the described cascaded high-voltage frequency converter is provided with auxiliary winding; This device comprises circuit part and control section; Described circuit part is: the three-phase input end of described auxiliary winding links to each other with three-phase low-tension supply U through three current-limiting resistance R2; Between current-limiting resistance R2 and three-phase low-tension supply U, be in series with main contactor group KM2, the secondary side of described phase shifting transformer T links to each other with the power cell of cascaded high-voltage frequency converter, the external direct current bus capacitor C of power cell; Described control section is the Main Control Tank of cascaded high-voltage frequency converter, and Main Control Tank is provided with the input signal button, and the break-make of the said main contactor group of the signal controlling KM2 of Main Control Tank output is carried out signal communication between said power cell and the Main Control Tank and is connected.
The utility model is from the auxiliary winding side of phase shifting transformer 380V, input charging voltage.When dc-link capacitance C gets electric moment, be equivalent to short circuit, very big to the device impulse current; For reducing the harmful effect of impulse current to device; So connect high-power ripple resistance with the restriction size of current, can calculate the relation between impulse current and the current-limiting resistance according to the short-circuit parameter in the transformer handbook, after dc-link capacitance C charging is accomplished at input side; Electric current on the current-limiting resistance R2 of auxiliary winding side is then stable, and current-limiting resistance R2 and auxiliary winding coil are equivalent to the relation of dividing potential drop.For guaranteeing that power cell gets piezoelectric voltage can reach more than 70% of normal working voltage, then need be according to the relation between high-power ripple resistance of no-load transformer calculation of parameter and the voltage under the situation of the high-power ripple resistance of series connection.Event just can calculate the resistance and the power of the high-power ripple resistance R 2 of required series connection according to transformer short-circuit parameter and unloaded parameter.If impulse current is excessive; The resistance value of need selecting is crossed under the situation that the affects power cell gets piezoelectric voltage; Can consider that powered on moment connects one group of current-limiting resistance R2 and main contactor group KM2 to satisfy the requirement of limit value charging, parallelly connected again one group of current-limiting resistance R1 and contactor group KM1 are to satisfy the requirement of charging voltage after time-delay a period of time.Precharge and the control of low pressure debug process are then through Main Control Tank and peripheral interface relay and contactor completion.The touch-screen of the man-machine interface through cascaded high-voltage frequency converter can be set frequency converter needs precharge action or low pressure debugging action.The precharge motion flow is: through touch-screen pre-charging functions is opened; Through inching button will charge the beginning pulse signal send into the Main Control Tank control chip through Main Control Tank IO mouth; Main Control Tank judges then whether cascaded high-voltage frequency converter is in the state that no high-tension electricity can charge, if when being in no high-tension electricity state, Main Control Tank sends signal controlling main contactor group KM2 and makes its closure; Dc-link capacitance C in the power cell is in pre-charge state; After charging a period of time, power cell sends charging completion signal and advances in the Main Control Tank, and Main Control Tank is according to the judgement of frequency converter charging completion status; The output signal breaks off the signal of assisting winding side main contactor group KM2 and output one tunnel to allow to go up high pressure, pre-charge process completion.Because there is a time in power cell dc-link capacitance C discharge, Main Control Tank judges that high pressure is gone up in permission when dc-link capacitance C voltage is not less than 50%.When the low pressure debug function is opened; Main Control Tank obtains then can keeping auxiliary winding side main contactor KM2 group to be in closure state behind the charging beginning pulse signal; Can not export low-voltage power-off signal and high pressure and allow power on signal; This moment, high voltage converter kept being in the low-voltage power supply state, and each pcb board of power cell gets electric operate as normal for accomplishing the low pressure debugging.
Claims (4)
1. device that precharge and low pressure debugging power supply is provided for cascaded high-voltage frequency converter; Phase shifting transformer in the described cascaded high-voltage frequency converter is provided with the auxiliary winding of low pressure; It is characterized in that: comprise power supply circuits part and control section; Described power supply circuits partly are: the three-phase input end of described auxiliary winding links to each other with the three-phase low-tension supply through three current-limiting resistances; Between current-limiting resistance and three-phase low-tension supply, be in series with the main contactor group, the secondary side of described phase shifting transformer links to each other with the power cell of cascaded high-voltage frequency converter; Described control section is the Main Control Tank in the cascaded high-voltage frequency converter; Main Control Tank is provided with the input signal button; The break-make of the main contactor group of the said power supply circuits of signal controlling of Main Control Tank output communicates through optical fiber between said power cell and the Main Control Tank.
2. according to claim 1 for cascaded high-voltage frequency converter provides the device of precharge and low pressure debugging power supply, it is characterized in that: described current-limiting resistance is high-power ripple resistance.
3. the device that precharge and low pressure debugging power supply are provided for cascaded high-voltage frequency converter according to claim 1; It is characterized in that:, can be parallel with contactor group and the current-limiting resistance that is in series at the main contactor group and the current-limiting resistance two ends of each input of assisting winding if precharge moment impact electric current is excessive.
4. according to claim 1 for cascaded high-voltage frequency converter provides the device of precharge and low pressure debugging power supply, it is characterized in that: described auxiliary winding rated voltage is 380V, and the voltage of said three-phase low-tension supply is 380V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220215666 CN202616989U (en) | 2012-05-14 | 2012-05-14 | Device for providing pre-charging function and low-voltage debugging power supply function for cascaded high-voltage inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220215666 CN202616989U (en) | 2012-05-14 | 2012-05-14 | Device for providing pre-charging function and low-voltage debugging power supply function for cascaded high-voltage inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202616989U true CN202616989U (en) | 2012-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220215666 Expired - Fee Related CN202616989U (en) | 2012-05-14 | 2012-05-14 | Device for providing pre-charging function and low-voltage debugging power supply function for cascaded high-voltage inverter |
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| Country | Link |
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| CN (1) | CN202616989U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108008235A (en) * | 2017-11-17 | 2018-05-08 | 珠海格力电器股份有限公司 | Dc bus method for detecting short circuit, device and detection circuit |
| CN109217649A (en) * | 2018-11-13 | 2019-01-15 | 上海中车汉格船舶与海洋工程有限公司 | A kind of pre-charge circuit and precharge frequency changing driving system |
-
2012
- 2012-05-14 CN CN 201220215666 patent/CN202616989U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108008235A (en) * | 2017-11-17 | 2018-05-08 | 珠海格力电器股份有限公司 | Dc bus method for detecting short circuit, device and detection circuit |
| CN109217649A (en) * | 2018-11-13 | 2019-01-15 | 上海中车汉格船舶与海洋工程有限公司 | A kind of pre-charge circuit and precharge frequency changing driving system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121219 Termination date: 20140514 |