CN203761310U - Non-midpoint capacitor split phase type power converter with midpoint voltage active adjustment - Google Patents
Non-midpoint capacitor split phase type power converter with midpoint voltage active adjustment Download PDFInfo
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- CN203761310U CN203761310U CN201420102280.2U CN201420102280U CN203761310U CN 203761310 U CN203761310 U CN 203761310U CN 201420102280 U CN201420102280 U CN 201420102280U CN 203761310 U CN203761310 U CN 203761310U
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Abstract
The utility model discloses a non-midpoint capacitor split phase type power converter with midpoint voltage active adjustment. Based on a traditional split phase type power converter of a 2N phase switched reluctance motor, two midpoint capacitors are removed. Two power switch tubes are added among a power supply anode, a power supply cathode and a midpoint of a winding star-type connection. A drain electrode and a source electrode of one power switch tube are connected between the power supply anode and the midpoint of the star connection. A drain electrode and a source electrode of the other power switch tube are connected between the midpoint of the star connection and the power supply cathode. By using the converter of the utility model, two large capacitors at the midpoint of the traditional split phase type power converter are omitted; cost of the power converter reduced and system reliability is increased; a problem that a midpoint voltage pulsation of the star connection of the non-midpoint capacitor split phase type power converter is not controllable is solved; a torque pulsation of a motor is effectively reduced; vibration noises are reduced and driving system efficiency is increased.
Description
Technical field
The utility model relates to power converter of switch reluctance motor field, relate in particular to a kind of with the active adjusting of mid-point voltage without mid point electric capacity split phase type power inverter.
Background technology
Switched reluctance machines (Switched Reluctance Motor, hereinafter to be referred as SR motor) be a kind of New-type electric machine that last century, the eighties occurred, due to SR motor have simple in structure firm, controllable parameter is many, control flexibly, the advantages such as efficiency is high, starting performance is good, make it be widely applied in fields such as drive system of electric motor vehicle, household electrical appliance, universal industrial, servo-drive, mining machineries.
SR motor normally moves, and each phase current need to keep a fixed phase-sequence, have certain break-make moment, and power inverter is part important in SR motor driven systems.The power inverter of SR motor, by direct current (or AC rectification) Power supply, is exported periodic pulse current, supplies with SR motor to drive its operation and to realize various control.
The power inverter of SR motor, can be divided into semibridge system and split phase type etc. by the arrangement position of switching tube, can be divided into the multiple topological forms such as inductive type, capacitance energy storage type, energy consumption formula by the afterflow mode of commutation.What asymmetrical half-bridge topology was used at present is maximum, and it is applicable to each phase SR motor and alternate independence, but has the shortcoming that outlet is more, switching device is many.For 2N phase SR motor, adopt split phase type topology to make switching device quantity reduce half, outlet minimizing half, the cost of power inverter and reliability strengthen.Therefore, often adopt split phase type topology for 2N phase SR motor.
In split phase type topology, phase winding is star-like connection, is connected to two large electric capacity between mid point and power positive cathode, for reducing the mains ripple of star-like connection mid point.But make adding of two large electric capacity the cost of power inverter, volume increase, reliability also reduces simultaneously, therefore relevant scholar proposes directly to remove two large electric capacity of midpoint, adopts the split phase type topology without mid point electric capacity.Under this topology there is larger pulsation in the star-like connection mid-point voltage of SR motor winding, but SR motor can normally move and torque pulsation is little, a lot of but its power output has reduced compared with split phase type topology with mid point electric capacity.
In split phase type topology, each phase winding both end voltage equals the poor of mid-point voltage or direct voltage and mid-point voltage, show that by research mid-point voltage is for performance importants such as the commutation of SR motor, torque pulsation, vibration noise, efficiency, and proposed at present with mid point electric capacity, the mid-point voltage of the split phase type topology with mid point electric capacity is all not uncontrollable or not directly control, be not easy to the performance of SR motor to regulate and realize optimal control.
Utility model content
Technical problem to be solved in the utility model be to overcome existing 2N phase SR power of motor converter asymmetrical half-bridge topology switching device and outlet many, the problems such as split phase type topology mid-point voltage is uncontrollable, provide a kind of with the active adjusting of mid-point voltage without mid point electric capacity split phase type power inverter topology, master switch number of devices is only (2N+2), outlet number is only (2N+1), add two power switch pipes are taked to different control strategies simultaneously, produce corresponding optimum mid-point voltage waveform, can accelerate winding commutation, increase the average output torque of motor, effectively reduce the torque pulsation of motor, reduce vibration noise, improve the efficiency of drive system, promote the performance of SR electric system.
The utility model specifically solves the problems of the technologies described above by the following technical solutions:
A kind of with the active adjusting of mid-point voltage without mid point electric capacity split phase type power inverter, comprise DC power supply, electric capacity, the active adjustment module of mid-point voltage and N quarter-phase circuit module, described DC power supply, electric capacity, the active adjustment module of mid-point voltage, a N quarter-phase circuit module parallel connection, N is more than or equal to 1 integer;
The active adjustment module of described mid-point voltage comprises the first power switch pipe and the second power switch pipe, the drain electrode of described the first power switch pipe is connected with positive source, the source electrode of described the second power switch pipe is connected with power cathode, and the source electrode of described the first power switch pipe is connected with the drain electrode of the second power switch pipe;
Described quarter-phase circuit module comprises the first switch element, second switch element, the first diode and the second diode, the negative electrode of described the first diode by the first switch element be connected with positive source, anode is connected with power cathode, the anode of described the second diode passes through that second switch element is connected with power cathode, negative electrode is connected with positive source.
When use, the phase winding of 2N phase SR motor is divided into N group, correspond respectively to the active adjusting of mid-point voltage without N quarter-phase circuit module in mid point electric capacity split phase type power inverter, for every group of phase winding, comprise 2 phase windings, the source electrode of the first power switch pipe in the quarter-phase circuit module that the negative electrode of the first diode in the quarter-phase circuit module corresponding with it of one end of one of them phase winding is connected, the other end is corresponding with it is connected; The anode of the second diode in the quarter-phase circuit module corresponding with it of one end of another phase winding is connected, and the source electrode of the first power switch pipe in the other end quarter-phase circuit module corresponding with it is connected.
Only need to adopt the power inverter topology the utility model proposes, when main switching device control according to position signalling, two power switch pipes of the active adjusting in alignment place are taked corresponding control strategy, just can make SR motor efficiently, reliability service.
The utility model adopts above technical scheme compared with prior art, has following technique effect:
1. power device is few, outlet is few, and cost, reliability strengthen.Power inverter topology of the present utility model is applicable to 2N phase SR motor, if adopting asymmetrical half-bridge switching device requirement is 4N, diode requirement is 4N, outlet requirement is 4N, and the power inverter topology that employing the utility model proposes, switching device quantity is that (2N+2) is individual, and number of diodes is 2N, and required outlet number is (2N+1).Required device and outlet reduce by contrast, and it is individual that switching device has reduced (2N-2), and diode has reduced 2N, and it is individual that outlet number has reduced (2N-1).Taking four phase SR motors as example (N=2), power device reduces 6 altogether, and outlet reduces 3; Taking six phase SR motors as example (N=3), power device reduces 10 altogether, and outlet reduces 5.Along with N increases, the power device of minimizing and outlet are just more;
2. phase winding both end voltage is controlled, and motor performance is promoted.Traditional split phase type topology that overcome power inverter of the present utility model has reduced device, outlet number but single-phase winding both end voltage uncontrollable shortcoming of bringing.With the split phase type topology of mid point electric capacity, if control mid-point voltage and be approximately the half of input direct voltage, need to increase the capacity of electric capacity, this will increase cost, adding of electric capacity the reliability of power inverter is reduced simultaneously, and electric capacity alignment voltage can only play the regulating action of amplitude, cannot regulate for the phase place of the periodicity mid-point voltage of pulsation.Without the split phase type topology of mid point electric capacity, alignment voltage does not regulate, and under the mid-point voltage of freely pulsing, the power output of SR motor, on average exports torque and all reduces a lot, and the performance of motor fails to utilize completely.And power topology of the present utility model, for example can adopt the active regulation technology of mid-point voltage pulse-width modulation, the amplitude, the phase place that get final product alignment voltage regulate, can realize the maximum utilization of motor performance, can accelerate winding commutation, increase motor average output torque, increase starting and overload capacity, effectively reduce motor torque pulsation, reduce vibration noise, improve the efficiency etc. of drive system;
3. control strategy variation, also makes the fault-tolerant ability of SR motor strengthen simultaneously, can failure operation.Tradition split phase type topology, must have two-phase conducting simultaneously normally to move, and can only take half period conducting strategy, and when certain breaks down mutually, SR motor cannot failure operation simultaneously.And the mid-point voltage of power inverter of the present utility model is produced by the control of two power switch pipes of the active adjusting of midpoint, shutoff in advance or the phase shortage of a certain phase winding do not affect mid-point voltage, therefore can adopt various conducting strategy and realize the failure operation of SR motor;
4. be particularly suitable for heterogeneous SR motor.Heterogeneous SR motor has following features: the number of phases increases power demand device, outlet number increases greatly; The number of phases is many, can realize the strategy that variation is controlled, and power output is large, and torque pulsation is little; Fault-tolerant ability is strong, and failure operation is good.Power inverter of the present utility model meets the requirement of these features completely, and the application in heterogeneous SR motor has unique advantage.
Brief description of the drawings
Fig. 1 be the active adjusting of the utility model band mid-point voltage without mid point electric capacity split phase type power inverter schematic diagram;
Fig. 2 is the band mid point electric capacity split phase type power inverter topology schematic diagram of four phase SR motors;
Fig. 3 be four phase SR motors without mid point electric capacity split phase type power inverter topology schematic diagram;
Fig. 4 is that the utility model is specifically applied in the power inverter topology schematic diagram on four phase SR motors;
Fig. 5 is that the utility model is specifically applied in the power inverter topology schematic diagram on six phase SR motors;
Fig. 6 is the voltage waveform that adopts traditional split phase type topology simulation mid point of two infinitely great electric capacity of mid point band;
Fig. 7 is the torque waveform that adopts traditional split phase type topology simulation output of two infinitely great electric capacity of mid point band;
Fig. 8 is the voltage waveform adopting without traditional split phase type topology simulation mid point of mid point electric capacity;
Fig. 9 is the torque waveform adopting without traditional split phase type topology simulation output of mid point electric capacity;
Figure 10 is the torque waveform that adopts certain corresponding control strategy of the utility model power inverter topology to export once;
Figure 11 is the torque waveform that adopts two times outputs of certain corresponding control strategy of the utility model power inverter topology.
Embodiment
Below in conjunction with accompanying drawing, the technical solution of the utility model is described in further detail:
As shown in Figure 1, the utility model discloses a kind of with the active adjusting of mid-point voltage without mid point electric capacity split phase type power inverter, comprise DC power supply, electric capacity, the active adjustment module of mid-point voltage and N quarter-phase circuit module, described DC power supply, electric capacity, the active adjustment module of mid-point voltage, a N quarter-phase circuit module parallel connection, N is more than or equal to 1 integer;
The active adjustment module of described mid-point voltage comprises the first power switch pipe and the second power switch pipe, the drain electrode of described the first power switch pipe is connected with positive source, the source electrode of described the second power switch pipe is connected with power cathode, and the source electrode of described the first power switch pipe is connected with the drain electrode of the second power switch pipe;
Described quarter-phase circuit module comprises the first switch element, second switch element, the first diode and the second diode, the negative electrode of described the first diode by the first switch element be connected with positive source, anode is connected with power cathode, the anode of described the second diode passes through that second switch element is connected with power cathode, negative electrode is connected with positive source.
When use, the phase winding of 2N phase SR motor is divided into N group, correspond respectively to the active adjusting of mid-point voltage without N quarter-phase circuit module in mid point electric capacity split phase type power inverter, for every group of phase winding, comprise 2 phase windings, the source electrode of the first power switch pipe in the quarter-phase circuit module that the negative electrode of the first diode in the quarter-phase circuit module corresponding with it of one end of one of them phase winding is connected, the other end is corresponding with it is connected; The anode of the second diode in the quarter-phase circuit module corresponding with it of one end of another phase winding is connected, and the source electrode of the first power switch pipe in the other end quarter-phase circuit module corresponding with it is connected.
Any 2N phase SR motor is all suitable for without mid point electric capacity split phase type topology with the active adjusting of mid-point voltage the utility model proposes.Be applied in the SR motor (when N gets different value) of the different numbers of phases, as long as increase or reduce the i.e. two phase module M (N) of brachium pontis of corresponding switching tube and diode composition.
Shown in Fig. 2 and Fig. 3, for the band mid point electric capacity split phase type topological sum of four at present conventional phase SR motors is without mid point electric capacity split phase type topology schematic diagram.
As shown in Figure 4 and Figure 5, the utility model power conversion implement body is applied in the power inverter topology schematic diagram in four phase SR motors and six phase SR motors.
Taking certain four phase SR motor as example, in conjunction with simulation result shows:
As shown in Figure 2, to four phase SR motors (all adopt below this model machine and input direct voltage, open close the control strategy such as the angle of rupture all identical), adopt the split phase type power inverter of the infinitely great electric capacity of mid point band, mid point output waveform as shown in Figure 6, as shown in Figure 7, average torque is 8.73N*m to simulation data torque waveform, and breakdown torque is 15.51N*m, pull up torque is 4.64N*m, and torque pulsation is 10.87N*m.
As Fig. 3, to four phase SR motors, adopt the split phase type converter without mid point electric capacity, as shown in Figure 8, as shown in Figure 9, average torque is 6.07N*m to simulation data torque waveform to mid point output waveform, breakdown torque is 8.11N*m, and pull up torque is 5.11N*m, and torque pulsation is 3N*m.
As Fig. 4, to four phase SR motors, adopt the utility model with the active adjusting of mid-point voltage without mid point electric capacity split phase type power inverter, two switching tubes that alignment place adds adopt respectively two kinds of different active adjusting control strategies, make mid-point voltage respectively with the voltage waveform equivalence of Fig. 6 and Fig. 8, the torque waveform of output is respectively as shown in Figure 10 and Figure 11.
As shown in figure 10, average torque is 8.73N*m, breakdown torque is 15.88N*m, pull up torque is 4.59N*m, torque pulsation is 11.29N*m, the effect producing under this kind of control strategy and Fig. 7 export the about the same of torque waveform, and actual output average torque is larger, and this kind of operating state is suitable as SR motor overload running status.
As shown in figure 11, average torque is 7N*m, breakdown torque is 9.08N*m, pull up torque is 5.28N*m, torque pulsation is 3.8N*m, and under this kind of control strategy of SR motor, (being under this kind of mid-point voltage waveform) output torque waveform and Fig. 9 approach, and torque pulsation reduces greatly compared with Fig. 7, Figure 11, under this kind of operating state, SR motor is exported certain average torque and is also had less torque pulsation outward, is suitable as the nominal operation state of SR motor.
Can see by analysis above, use the utility model with the active adjusting of mid point without mid point electric capacity power inverter, can be according to the different demands of SR motor operating state, the switching tube that alignment place adds is taked different control strategies, alignment voltage regulates, and has reached the effect that SR motor performance is improved.And the current normal band mid point electric capacity split phase type adopting and without mid point electric capacity split phase type power inverter, due to the uncontrollable shortcoming of mid-point voltage, motor performance is difficult to be optimized, and is difficult to realize various control strategy.
Claims (1)
- One kind with the active adjusting of mid-point voltage without mid point electric capacity split phase type power inverter, it is characterized in that, comprise DC power supply, electric capacity, the active adjustment module of mid-point voltage and N quarter-phase circuit module, described DC power supply, electric capacity, the active adjustment module of mid-point voltage, a N quarter-phase circuit module parallel connection, N is more than or equal to 1 integer;The active adjustment module of described mid-point voltage comprises the first power switch pipe and the second power switch pipe, the drain electrode of described the first power switch pipe is connected with positive source, the source electrode of described the second power switch pipe is connected with power cathode, and the source electrode of described the first power switch pipe is connected with the drain electrode of the second power switch pipe;Described quarter-phase circuit module comprises the first switch element, second switch element, the first diode and the second diode, the negative electrode of described the first diode by the first switch element be connected with positive source, anode is connected with power cathode, the anode of described the second diode passes through that second switch element is connected with power cathode, negative electrode is connected with positive source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420102280.2U CN203761310U (en) | 2014-03-07 | 2014-03-07 | Non-midpoint capacitor split phase type power converter with midpoint voltage active adjustment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420102280.2U CN203761310U (en) | 2014-03-07 | 2014-03-07 | Non-midpoint capacitor split phase type power converter with midpoint voltage active adjustment |
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| CN203761310U true CN203761310U (en) | 2014-08-06 |
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| CN201420102280.2U Expired - Fee Related CN203761310U (en) | 2014-03-07 | 2014-03-07 | Non-midpoint capacitor split phase type power converter with midpoint voltage active adjustment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103840723A (en) * | 2014-03-07 | 2014-06-04 | 南京航空航天大学 | Non-neutral-point-capacitor split phase type power converter with neutral-point voltage active adjustment |
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- 2014-03-07 CN CN201420102280.2U patent/CN203761310U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103840723A (en) * | 2014-03-07 | 2014-06-04 | 南京航空航天大学 | Non-neutral-point-capacitor split phase type power converter with neutral-point voltage active adjustment |
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| Date | Code | Title | Description |
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| 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: 20140806 Termination date: 20160307 |
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| CF01 | Termination of patent right due to non-payment of annual fee |