CN205249046U - Converter dynamic braking reaches and goes up electric snubber circuit - Google Patents
Converter dynamic braking reaches and goes up electric snubber circuit Download PDFInfo
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- CN205249046U CN205249046U CN201521097478.7U CN201521097478U CN205249046U CN 205249046 U CN205249046 U CN 205249046U CN 201521097478 U CN201521097478 U CN 201521097478U CN 205249046 U CN205249046 U CN 205249046U
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- dynamic braking
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- power resistor
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Abstract
The utility model relates to a frequency converter technology field discloses a converter dynamic braking reaches and goes up electric snubber circuit, including rectifier module U1, contravariant module U2, electric capacity C1, power resistor R1, diode D1, relay K1 and IGBT single tube Q1, IGBT single tube Q1's drain electrode is connected with diode D1's positive pole, power resistor R1's one end, the second contact B of relay, and its grid is connected with electric capacity C1's one end, diode D1's negative pole is connected with relay K1's first contact A, power resistor R1's the other end is connected with relay K1's third contact C. The utility model discloses only use a power resistor, realized last electricity buffering and two kinds of functions of dynamic braking. When electricity on the converter promptly, go up electricity buffering starting resistance as the converter, when normal operating, as the dynamic braking resistance of converter. For not plus brake resistance's occasion, brake performance has been improved. Make full use of the inside resource of converter for the converter inner space is compacter.
Description
Technical field
The utility model relates to converter technology field, more particularly, and particularly a kind of frequency converter dynamic braking and powering onBuffer circuit.
Background technology
In the process of socio-economic development, Based Intelligent Control and green energy conservation are the targets that people pursue always. Due to frequency converterThere are above two features, more and more extensive in the application of industrial and agricultural production every field. Universal frequency converter is mostly voltageType ac-dc-ac inverter device, first becoming direct current after AC rectification filtering, then is transformed into the adjustable friendship of frequency direct currentStream electricity carrys out drive motors. This topological structure makes frequency converter in decelerating through motor, when braking, and motor is in regenerative power generation state,And irreversible due to rectification link, the regenerative electric energy of generation constantly accumulates on DC side filter capacitor, produces pump up voltage.Too high pump up voltage likely damages switching device, electrochemical capacitor, thereby threatens frequency converter trouble free service, and having limited it shouldUse scope. General method is at dc bus termination dynamic braking unit or energy feedback unit. Due to energy feedback listFirst is expensive, and the power of feedback is all larger, so limited its use on Small-power Inverter. LittleSome occasion that power inverter uses, motor load is lighter, but needs very short deceleration time; Or motor is negativeCarry heavier, but deceleration time neither be very short, but there will be overvoltage fault; Or the use occasion of high-frequency electric machines,Deceleration time is short, but load is very light; Above frequency converter use occasion, has a common feature: when motor stopping, and electricityThe power of machine regenerative electric power is little.
This occasion, only needs a less braking circuit of braking power to meet the demands. But due to the body of braking resistorLong-pending larger, general frequency changer is all built-in braking resistor not on market now, but needs user to match. ThisSample has just limited the application of frequency converter in these occasions. In order to meet this occasion, must be at the inner individuality that increases of frequency converterLong-pending larger power resistor or allow the additional power resistor of user, no matter which kind of mode, the volume that has all increased system with becomeThis. Fig. 1 is this general frequency changer, and Q1, R2, D1 form energy-dissipating brake circuit, and R1, K1 formation powers onBuffer circuit, wherein, R1 is the starting resistance of frequency converter while powering on, after system starts and finishes, power resistor R1 is continuedElectrical equipment K1 short circuit, i.e. only work in the time that system powers on of power resistor R1.
Utility model content
The purpose of this utility model is to provide a kind of frequency converter dynamic braking and the buffer circuit that powers on, and it can make full use of frequency conversionDevice internal resource, makes frequency convertor system inner space compacter.
In order to achieve the above object, the technical solution adopted in the utility model is as follows:
A kind of frequency converter dynamic braking and the buffer circuit that powers on, comprise rectification module U1, inversion module U2, capacitor C 1, meritRate resistance R 1, diode D1, relay K 1 and IGBT single tube Q1, the drain electrode of described IGBT single tube Q1 and diode D1One end, the second contact B of relay of anode, power resistor R1 connect, its grid is connected with one end of capacitor C 1;The negative electrode of described diode D1 is connected with the first contact A of relay K 1, the other end of described power resistor R1 and relayThe 3rd contact C of device K1 connects.
Preferably, described resistance is formed by several power resistor serial or parallel connections.
Compared with prior art, the utility model has the advantage of: the utility model only uses a power resistor, simultaneously realPower on buffering and two kinds of functions of dynamic braking are showed. In the time that frequency converter powers on, as the buffer starting resistance that powers on of frequency converter;In the time that frequency converter normally moves, as the dynamic braking resistance of frequency converter. With respect to the occasion of additional braking resistor not, brakingPerformance has had large increase. Take full advantage of the internal resource of frequency converter, make frequency convertor system inner space compacter.
Brief description of the drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, below will be to embodiment or existingHave the accompanying drawing of required use in technical description to be briefly described, apparently, the accompanying drawing in the following describes is only thisSome embodiment of utility model, for those of ordinary skill in the art, are not paying under the prerequisite of creative work,Can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is existing frequency convertor system internal circuit schematic diagram.
Fig. 2 is the electrical schematic diagram of power-supply system frequency converter of the present utility model dynamic braking and the buffer circuit that powers on.
Fig. 3 is power-supply system frequency converter of the present utility model dynamic braking and the electric current of buffer circuit in the time that frequency converter powers on that power onFlow graph.
Fig. 4 is power-supply system frequency converter of the present utility model dynamic braking and the current direction of buffer circuit in the time of braking that power onFigure.
Fig. 5 is power-supply system frequency converter of the present utility model dynamic braking and the current direction of buffer circuit in the time of afterflow that power onFigure.
Detailed description of the invention
Below in conjunction with accompanying drawing, preferred embodiment of the present utility model is described in detail, so that advantage of the present utility model and spyThereby levy and can be easier to be it will be appreciated by those skilled in the art that protection domain of the present utility model is made to more explicit boundaryFixed.
Consult shown in Fig. 1, the utility model provides a kind of frequency converter dynamic braking and the buffer circuit that powers on, and comprises rectification moduleU1, inversion module U2, capacitor C 1, power resistor R1, diode D1, relay K 1 and IGBT single tube Q1, described inThe drain electrode of IGBT single tube Q1 is connected with one end of the anode of diode D1, power resistor R1, the second contact B of relay,Its grid is connected with one end of capacitor C 1; The negative electrode of described diode D1 is connected with the first contact A of relay K 1, instituteState the other end of power resistor R1 and the 3rd contact C of relay K 1 is connected.
Principle of the present utility model is, the A of described relay K 1, B contact are normally-closed contact, and A, C are normally opened contact. C1For the dc-link capacitance of frequency converter, the voltage at C1 two ends is the busbar voltage of frequency converter. In the time that frequency converter just powers on, because ofThe power supply of frequency convertor system is not set up, and the control coil of relay K 1 is in off working state, i.e. the A of relay K 1, BThe closing of contact, A, C contact disconnect. Input AC electricity is by rectification module U1, the A of relay K 1, B contact, resistanceThe series loop of R1 is to bus energy storage filter capacitor C1 charging, and as shown in Figure 3, wherein I1 is charging current.
After power up completes, it is stable that busbar voltage reaches, and frequency converter Ge road power supply has been set up, and control system is givenGo out control signal, make relay K 1 adhesive, A, B contact disconnect, and A, the C closing of contact, as shown in the K1 in Fig. 4.Now resistance R 1 is not re-used as starting resistance use, but as dynamic braking resistance, with diode D1, IGBT single tube Q1Form energy-dissipating brake circuit. In the time that frequency converter works in load energy feedback state, busbar voltage raises, and need to carry out energy consumptionBraking, control system output pwm signal control IGBT single tube Q1 is with certain dutycycle conducting. When IGBT single tube, Q1 leadsWhen logical, resistance R 1 forms discharge loop with IGBT single tube Q1, and the energy on bus capacitor is the shape with heat by resistance R 1Formula discharges, and as shown in Figure 4, wherein I2 is discharge current; In the time that IGBT single tube Q1 turn-offs, because existing, resistance R 1 postsRaw inductance, the electric current I 2 in resistance R 1 can not drop to zero at once, but by A, the C of diode D1, relay K 1Afterflow is carried out in the series loop that contact forms, as shown in Figure 5. By regulating the conducting dutycycle of IGBT single tube Q1, with regard to energyThe size of adjustable brake power, braking power is larger, and the heating of resistance R 1 is also larger. After braking procedure finishes, busVoltage falls after rise to normal level, and control system is turn-offed IGBT single tube Q1. So just complete a complete braking procedure.Because the power of starting resistance is little compared with additional braking resistor, therefore the on-state rate of IGBT single tube Q1 should not be too large,But with respect to the occasion of additional braking resistor not, braking ability has had large increase.
As preferably, described resistance can be formed by several power resistor serial or parallel connections.
By enforcement of the present utility model, because it only uses a power resistor, power on buffering and energy consumption system have been realized simultaneouslyMoving two kinds of functions. In the time that frequency converter powers on, as the buffer starting resistance that powers on of frequency converter; In the time that frequency converter normally moves,As the dynamic braking resistance of frequency converter. With respect to the occasion of additional braking resistor not, braking ability has had large increase. FillDivide the internal resource that has utilized frequency converter, make frequency convertor system inner space compacter.
Although embodiment of the present utility model has been described by reference to the accompanying drawings, what the patent owner can be in claimsWithin scope, make various distortion or amendment, as long as be no more than the described protection domain of claim of the present utility model, allShould be within protection domain of the present utility model.
Claims (2)
1. frequency converter dynamic braking and the buffer circuit that powers on, comprise rectification module U1, inversion module U2, capacitor C 1,Power resistor R1, diode D1, relay K 1 and IGBT single tube Q1, is characterized in that: described IGBT single tube Q1Drain electrode be connected with the anode of diode D1, one end of power resistor R1, the second contact B of relay, its grid withOne end of capacitor C 1 connects; The negative electrode of described diode D1 is connected with the first contact A of relay K 1, described powerThe other end of resistance R 1 is connected with the 3rd contact C of relay K 1.
2. frequency converter dynamic braking according to claim 1 and the buffer circuit that powers on, is characterized in that: described electricityResistance is formed by several power resistor serial or parallel connections.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521097478.7U CN205249046U (en) | 2015-12-23 | 2015-12-23 | Converter dynamic braking reaches and goes up electric snubber circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521097478.7U CN205249046U (en) | 2015-12-23 | 2015-12-23 | Converter dynamic braking reaches and goes up electric snubber circuit |
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| Publication Number | Publication Date |
|---|---|
| CN205249046U true CN205249046U (en) | 2016-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521097478.7U Active CN205249046U (en) | 2015-12-23 | 2015-12-23 | Converter dynamic braking reaches and goes up electric snubber circuit |
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| CN (1) | CN205249046U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN106330002A (en) * | 2016-08-31 | 2017-01-11 | 武汉法利莱切焊系统工程有限公司 | Soft start and brake control circuit |
-
2015
- 2015-12-23 CN CN201521097478.7U patent/CN205249046U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN106330002A (en) * | 2016-08-31 | 2017-01-11 | 武汉法利莱切焊系统工程有限公司 | Soft start and brake control circuit |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |